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boringssl/include/openssl/ssl.h
David Benjamin cc9d935256 Buffer up QUIC data within a level internally. 
Avoid forcing the QUIC implementation to buffer this when we already have code
to do it. This also avoids QUIC implementations relying on this hook being
called for each individual message.

Change-Id: If2d70f045a25da1aa2b10fdae262cae331da06b1
Reviewed-on: https://boringssl-review.googlesource.com/c/32785
Commit-Queue: Steven Valdez <svaldez@google.com>
Reviewed-by: Steven Valdez <svaldez@google.com>
CQ-Verified: CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org>
2018-11-01 13:52:43 +00:00

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/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
* All rights reserved.
*
* This package is an SSL implementation written
* by Eric Young (eay@cryptsoft.com).
* The implementation was written so as to conform with Netscapes SSL.
*
* This library is free for commercial and non-commercial use as long as
* the following conditions are aheared to. The following conditions
* apply to all code found in this distribution, be it the RC4, RSA,
* lhash, DES, etc., code; not just the SSL code. The SSL documentation
* included with this distribution is covered by the same copyright terms
* except that the holder is Tim Hudson (tjh@cryptsoft.com).
*
* Copyright remains Eric Young's, and as such any Copyright notices in
* the code are not to be removed.
* If this package is used in a product, Eric Young should be given attribution
* as the author of the parts of the library used.
* This can be in the form of a textual message at program startup or
* in documentation (online or textual) provided with the package.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* "This product includes cryptographic software written by
* Eric Young (eay@cryptsoft.com)"
* The word 'cryptographic' can be left out if the rouines from the library
* being used are not cryptographic related :-).
* 4. If you include any Windows specific code (or a derivative thereof) from
* the apps directory (application code) you must include an acknowledgement:
* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
*
* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* The licence and distribution terms for any publically available version or
* derivative of this code cannot be changed. i.e. this code cannot simply be
* copied and put under another distribution licence
* [including the GNU Public Licence.]
*/
/* ====================================================================
* Copyright (c) 1998-2007 The OpenSSL Project. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. All advertising materials mentioning features or use of this
* software must display the following acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
*
* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For written permission, please contact
* openssl-core@openssl.org.
*
* 5. Products derived from this software may not be called "OpenSSL"
* nor may "OpenSSL" appear in their names without prior written
* permission of the OpenSSL Project.
*
* 6. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit (http://www.openssl.org/)"
*
* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
* ====================================================================
*
* This product includes cryptographic software written by Eric Young
* (eay@cryptsoft.com). This product includes software written by Tim
* Hudson (tjh@cryptsoft.com).
*
*/
/* ====================================================================
* Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
* ECC cipher suite support in OpenSSL originally developed by
* SUN MICROSYSTEMS, INC., and contributed to the OpenSSL project.
*/
/* ====================================================================
* Copyright 2005 Nokia. All rights reserved.
*
* The portions of the attached software ("Contribution") is developed by
* Nokia Corporation and is licensed pursuant to the OpenSSL open source
* license.
*
* The Contribution, originally written by Mika Kousa and Pasi Eronen of
* Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites
* support (see RFC 4279) to OpenSSL.
*
* No patent licenses or other rights except those expressly stated in
* the OpenSSL open source license shall be deemed granted or received
* expressly, by implication, estoppel, or otherwise.
*
* No assurances are provided by Nokia that the Contribution does not
* infringe the patent or other intellectual property rights of any third
* party or that the license provides you with all the necessary rights
* to make use of the Contribution.
*
* THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN
* ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA
* SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY
* OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR
* OTHERWISE.
*/
#ifndef OPENSSL_HEADER_SSL_H
#define OPENSSL_HEADER_SSL_H
#include <openssl/base.h>
#include <openssl/bio.h>
#include <openssl/buf.h>
#include <openssl/pem.h>
#include <openssl/span.h>
#include <openssl/ssl3.h>
#include <openssl/thread.h>
#include <openssl/tls1.h>
#include <openssl/x509.h>
#if !defined(OPENSSL_WINDOWS)
#include <sys/time.h>
#endif
// NGINX needs this #include. Consider revisiting this after NGINX 1.14.0 has
// been out for a year or so (assuming that they fix it in that release.) See
// https://boringssl-review.googlesource.com/c/boringssl/+/21664.
#include <openssl/hmac.h>
// Forward-declare struct timeval. On Windows, it is defined in winsock2.h and
// Windows headers define too many macros to be included in public headers.
// However, only a forward declaration is needed.
struct timeval;
#if defined(__cplusplus)
extern "C" {
#endif
// SSL implementation.
// SSL contexts.
//
// |SSL_CTX| objects manage shared state and configuration between multiple TLS
// or DTLS connections. Whether the connections are TLS or DTLS is selected by
// an |SSL_METHOD| on creation.
//
// |SSL_CTX| are reference-counted and may be shared by connections across
// multiple threads. Once shared, functions which change the |SSL_CTX|'s
// configuration may not be used.
// TLS_method is the |SSL_METHOD| used for TLS connections.
OPENSSL_EXPORT const SSL_METHOD *TLS_method(void);
// DTLS_method is the |SSL_METHOD| used for DTLS connections.
OPENSSL_EXPORT const SSL_METHOD *DTLS_method(void);
// TLS_with_buffers_method is like |TLS_method|, but avoids all use of
// crypto/x509. All client connections created with |TLS_with_buffers_method|
// will fail unless a certificate verifier is installed with
// |SSL_set_custom_verify| or |SSL_CTX_set_custom_verify|.
OPENSSL_EXPORT const SSL_METHOD *TLS_with_buffers_method(void);
// DTLS_with_buffers_method is like |DTLS_method|, but avoids all use of
// crypto/x509.
OPENSSL_EXPORT const SSL_METHOD *DTLS_with_buffers_method(void);
// SSL_CTX_new returns a newly-allocated |SSL_CTX| with default settings or NULL
// on error.
OPENSSL_EXPORT SSL_CTX *SSL_CTX_new(const SSL_METHOD *method);
// SSL_CTX_up_ref increments the reference count of |ctx|. It returns one.
OPENSSL_EXPORT int SSL_CTX_up_ref(SSL_CTX *ctx);
// SSL_CTX_free releases memory associated with |ctx|.
OPENSSL_EXPORT void SSL_CTX_free(SSL_CTX *ctx);
// SSL connections.
//
// An |SSL| object represents a single TLS or DTLS connection. Although the
// shared |SSL_CTX| is thread-safe, an |SSL| is not thread-safe and may only be
// used on one thread at a time.
// SSL_new returns a newly-allocated |SSL| using |ctx| or NULL on error. The new
// connection inherits settings from |ctx| at the time of creation. Settings may
// also be individually configured on the connection.
//
// On creation, an |SSL| is not configured to be either a client or server. Call
// |SSL_set_connect_state| or |SSL_set_accept_state| to set this.
OPENSSL_EXPORT SSL *SSL_new(SSL_CTX *ctx);
// SSL_free releases memory associated with |ssl|.
OPENSSL_EXPORT void SSL_free(SSL *ssl);
// SSL_get_SSL_CTX returns the |SSL_CTX| associated with |ssl|. If
// |SSL_set_SSL_CTX| is called, it returns the new |SSL_CTX|, not the initial
// one.
OPENSSL_EXPORT SSL_CTX *SSL_get_SSL_CTX(const SSL *ssl);
// SSL_set_connect_state configures |ssl| to be a client.
OPENSSL_EXPORT void SSL_set_connect_state(SSL *ssl);
// SSL_set_accept_state configures |ssl| to be a server.
OPENSSL_EXPORT void SSL_set_accept_state(SSL *ssl);
// SSL_is_server returns one if |ssl| is configured as a server and zero
// otherwise.
OPENSSL_EXPORT int SSL_is_server(const SSL *ssl);
// SSL_is_dtls returns one if |ssl| is a DTLS connection and zero otherwise.
OPENSSL_EXPORT int SSL_is_dtls(const SSL *ssl);
// SSL_set_bio configures |ssl| to read from |rbio| and write to |wbio|. |ssl|
// takes ownership of the two |BIO|s. If |rbio| and |wbio| are the same, |ssl|
// only takes ownership of one reference.
//
// In DTLS, |rbio| must be non-blocking to properly handle timeouts and
// retransmits.
//
// If |rbio| is the same as the currently configured |BIO| for reading, that
// side is left untouched and is not freed.
//
// If |wbio| is the same as the currently configured |BIO| for writing AND |ssl|
// is not currently configured to read from and write to the same |BIO|, that
// side is left untouched and is not freed. This asymmetry is present for
// historical reasons.
//
// Due to the very complex historical behavior of this function, calling this
// function if |ssl| already has |BIO|s configured is deprecated. Prefer
// |SSL_set0_rbio| and |SSL_set0_wbio| instead.
OPENSSL_EXPORT void SSL_set_bio(SSL *ssl, BIO *rbio, BIO *wbio);
// SSL_set0_rbio configures |ssl| to write to |rbio|. It takes ownership of
// |rbio|.
//
// Note that, although this function and |SSL_set0_wbio| may be called on the
// same |BIO|, each call takes a reference. Use |BIO_up_ref| to balance this.
OPENSSL_EXPORT void SSL_set0_rbio(SSL *ssl, BIO *rbio);
// SSL_set0_wbio configures |ssl| to write to |wbio|. It takes ownership of
// |wbio|.
//
// Note that, although this function and |SSL_set0_rbio| may be called on the
// same |BIO|, each call takes a reference. Use |BIO_up_ref| to balance this.
OPENSSL_EXPORT void SSL_set0_wbio(SSL *ssl, BIO *wbio);
// SSL_get_rbio returns the |BIO| that |ssl| reads from.
OPENSSL_EXPORT BIO *SSL_get_rbio(const SSL *ssl);
// SSL_get_wbio returns the |BIO| that |ssl| writes to.
OPENSSL_EXPORT BIO *SSL_get_wbio(const SSL *ssl);
// SSL_get_fd calls |SSL_get_rfd|.
OPENSSL_EXPORT int SSL_get_fd(const SSL *ssl);
// SSL_get_rfd returns the file descriptor that |ssl| is configured to read
// from. If |ssl|'s read |BIO| is not configured or doesn't wrap a file
// descriptor then it returns -1.
//
// Note: On Windows, this may return either a file descriptor or a socket (cast
// to int), depending on whether |ssl| was configured with a file descriptor or
// socket |BIO|.
OPENSSL_EXPORT int SSL_get_rfd(const SSL *ssl);
// SSL_get_wfd returns the file descriptor that |ssl| is configured to write
// to. If |ssl|'s write |BIO| is not configured or doesn't wrap a file
// descriptor then it returns -1.
//
// Note: On Windows, this may return either a file descriptor or a socket (cast
// to int), depending on whether |ssl| was configured with a file descriptor or
// socket |BIO|.
OPENSSL_EXPORT int SSL_get_wfd(const SSL *ssl);
// SSL_set_fd configures |ssl| to read from and write to |fd|. It returns one
// on success and zero on allocation error. The caller retains ownership of
// |fd|.
//
// On Windows, |fd| is cast to a |SOCKET| and used with Winsock APIs.
OPENSSL_EXPORT int SSL_set_fd(SSL *ssl, int fd);
// SSL_set_rfd configures |ssl| to read from |fd|. It returns one on success and
// zero on allocation error. The caller retains ownership of |fd|.
//
// On Windows, |fd| is cast to a |SOCKET| and used with Winsock APIs.
OPENSSL_EXPORT int SSL_set_rfd(SSL *ssl, int fd);
// SSL_set_wfd configures |ssl| to write to |fd|. It returns one on success and
// zero on allocation error. The caller retains ownership of |fd|.
//
// On Windows, |fd| is cast to a |SOCKET| and used with Winsock APIs.
OPENSSL_EXPORT int SSL_set_wfd(SSL *ssl, int fd);
// SSL_do_handshake continues the current handshake. If there is none or the
// handshake has completed or False Started, it returns one. Otherwise, it
// returns <= 0. The caller should pass the value into |SSL_get_error| to
// determine how to proceed.
//
// In DTLS, the caller must drive retransmissions. Whenever |SSL_get_error|
// signals |SSL_ERROR_WANT_READ|, use |DTLSv1_get_timeout| to determine the
// current timeout. If it expires before the next retry, call
// |DTLSv1_handle_timeout|. Note that DTLS handshake retransmissions use fresh
// sequence numbers, so it is not sufficient to replay packets at the transport.
//
// TODO(davidben): Ensure 0 is only returned on transport EOF.
// https://crbug.com/466303.
OPENSSL_EXPORT int SSL_do_handshake(SSL *ssl);
// SSL_connect configures |ssl| as a client, if unconfigured, and calls
// |SSL_do_handshake|.
OPENSSL_EXPORT int SSL_connect(SSL *ssl);
// SSL_accept configures |ssl| as a server, if unconfigured, and calls
// |SSL_do_handshake|.
OPENSSL_EXPORT int SSL_accept(SSL *ssl);
// SSL_read reads up to |num| bytes from |ssl| into |buf|. It implicitly runs
// any pending handshakes, including renegotiations when enabled. On success, it
// returns the number of bytes read. Otherwise, it returns <= 0. The caller
// should pass the value into |SSL_get_error| to determine how to proceed.
//
// TODO(davidben): Ensure 0 is only returned on transport EOF.
// https://crbug.com/466303.
OPENSSL_EXPORT int SSL_read(SSL *ssl, void *buf, int num);
// SSL_peek behaves like |SSL_read| but does not consume any bytes returned.
OPENSSL_EXPORT int SSL_peek(SSL *ssl, void *buf, int num);
// SSL_pending returns the number of bytes available in |ssl|. It does not read
// from the transport.
OPENSSL_EXPORT int SSL_pending(const SSL *ssl);
// SSL_write writes up to |num| bytes from |buf| into |ssl|. It implicitly runs
// any pending handshakes, including renegotiations when enabled. On success, it
// returns the number of bytes written. Otherwise, it returns <= 0. The caller
// should pass the value into |SSL_get_error| to determine how to proceed.
//
// In TLS, a non-blocking |SSL_write| differs from non-blocking |write| in that
// a failed |SSL_write| still commits to the data passed in. When retrying, the
// caller must supply the original write buffer (or a larger one containing the
// original as a prefix). By default, retries will fail if they also do not
// reuse the same |buf| pointer. This may be relaxed with
// |SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER|, but the buffer contents still must be
// unchanged.
//
// By default, in TLS, |SSL_write| will not return success until all |num| bytes
// are written. This may be relaxed with |SSL_MODE_ENABLE_PARTIAL_WRITE|. It
// allows |SSL_write| to complete with a partial result when only part of the
// input was written in a single record.
//
// In DTLS, neither |SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER| and
// |SSL_MODE_ENABLE_PARTIAL_WRITE| do anything. The caller may retry with a
// different buffer freely. A single call to |SSL_write| only ever writes a
// single record in a single packet, so |num| must be at most
// |SSL3_RT_MAX_PLAIN_LENGTH|.
//
// TODO(davidben): Ensure 0 is only returned on transport EOF.
// https://crbug.com/466303.
OPENSSL_EXPORT int SSL_write(SSL *ssl, const void *buf, int num);
// SSL_shutdown shuts down |ssl|. It runs in two stages. First, it sends
// close_notify and returns zero or one on success or -1 on failure. Zero
// indicates that close_notify was sent, but not received, and one additionally
// indicates that the peer's close_notify had already been received.
//
// To then wait for the peer's close_notify, run |SSL_shutdown| to completion a
// second time. This returns 1 on success and -1 on failure. Application data
// is considered a fatal error at this point. To process or discard it, read
// until close_notify with |SSL_read| instead.
//
// In both cases, on failure, pass the return value into |SSL_get_error| to
// determine how to proceed.
//
// Most callers should stop at the first stage. Reading for close_notify is
// primarily used for uncommon protocols where the underlying transport is
// reused after TLS completes. Additionally, DTLS uses an unordered transport
// and is unordered, so the second stage is a no-op in DTLS.
OPENSSL_EXPORT int SSL_shutdown(SSL *ssl);
// SSL_CTX_set_quiet_shutdown sets quiet shutdown on |ctx| to |mode|. If
// enabled, |SSL_shutdown| will not send a close_notify alert or wait for one
// from the peer. It will instead synchronously return one.
OPENSSL_EXPORT void SSL_CTX_set_quiet_shutdown(SSL_CTX *ctx, int mode);
// SSL_CTX_get_quiet_shutdown returns whether quiet shutdown is enabled for
// |ctx|.
OPENSSL_EXPORT int SSL_CTX_get_quiet_shutdown(const SSL_CTX *ctx);
// SSL_set_quiet_shutdown sets quiet shutdown on |ssl| to |mode|. If enabled,
// |SSL_shutdown| will not send a close_notify alert or wait for one from the
// peer. It will instead synchronously return one.
OPENSSL_EXPORT void SSL_set_quiet_shutdown(SSL *ssl, int mode);
// SSL_get_quiet_shutdown returns whether quiet shutdown is enabled for
// |ssl|.
OPENSSL_EXPORT int SSL_get_quiet_shutdown(const SSL *ssl);
// SSL_get_error returns a |SSL_ERROR_*| value for the most recent operation on
// |ssl|. It should be called after an operation failed to determine whether the
// error was fatal and, if not, when to retry.
OPENSSL_EXPORT int SSL_get_error(const SSL *ssl, int ret_code);
// SSL_ERROR_NONE indicates the operation succeeded.
#define SSL_ERROR_NONE 0
// SSL_ERROR_SSL indicates the operation failed within the library. The caller
// may inspect the error queue for more information.
#define SSL_ERROR_SSL 1
// SSL_ERROR_WANT_READ indicates the operation failed attempting to read from
// the transport. The caller may retry the operation when the transport is ready
// for reading.
//
// If signaled by a DTLS handshake, the caller must also call
// |DTLSv1_get_timeout| and |DTLSv1_handle_timeout| as appropriate. See
// |SSL_do_handshake|.
#define SSL_ERROR_WANT_READ 2
// SSL_ERROR_WANT_WRITE indicates the operation failed attempting to write to
// the transport. The caller may retry the operation when the transport is ready
// for writing.
#define SSL_ERROR_WANT_WRITE 3
// SSL_ERROR_WANT_X509_LOOKUP indicates the operation failed in calling the
// |cert_cb| or |client_cert_cb|. The caller may retry the operation when the
// callback is ready to return a certificate or one has been configured
// externally.
//
// See also |SSL_CTX_set_cert_cb| and |SSL_CTX_set_client_cert_cb|.
#define SSL_ERROR_WANT_X509_LOOKUP 4
// SSL_ERROR_SYSCALL indicates the operation failed externally to the library.
// The caller should consult the system-specific error mechanism. This is
// typically |errno| but may be something custom if using a custom |BIO|. It
// may also be signaled if the transport returned EOF, in which case the
// operation's return value will be zero.
#define SSL_ERROR_SYSCALL 5
// SSL_ERROR_ZERO_RETURN indicates the operation failed because the connection
// was cleanly shut down with a close_notify alert.
#define SSL_ERROR_ZERO_RETURN 6
// SSL_ERROR_WANT_CONNECT indicates the operation failed attempting to connect
// the transport (the |BIO| signaled |BIO_RR_CONNECT|). The caller may retry the
// operation when the transport is ready.
#define SSL_ERROR_WANT_CONNECT 7
// SSL_ERROR_WANT_ACCEPT indicates the operation failed attempting to accept a
// connection from the transport (the |BIO| signaled |BIO_RR_ACCEPT|). The
// caller may retry the operation when the transport is ready.
//
// TODO(davidben): Remove this. It's used by accept BIOs which are bizarre.
#define SSL_ERROR_WANT_ACCEPT 8
// SSL_ERROR_WANT_CHANNEL_ID_LOOKUP indicates the operation failed looking up
// the Channel ID key. The caller may retry the operation when |channel_id_cb|
// is ready to return a key or one has been configured with
// |SSL_set1_tls_channel_id|.
//
// See also |SSL_CTX_set_channel_id_cb|.
#define SSL_ERROR_WANT_CHANNEL_ID_LOOKUP 9
// SSL_ERROR_PENDING_SESSION indicates the operation failed because the session
// lookup callback indicated the session was unavailable. The caller may retry
// the operation when lookup has completed.
//
// See also |SSL_CTX_sess_set_get_cb| and |SSL_magic_pending_session_ptr|.
#define SSL_ERROR_PENDING_SESSION 11
// SSL_ERROR_PENDING_CERTIFICATE indicates the operation failed because the
// early callback indicated certificate lookup was incomplete. The caller may
// retry the operation when lookup has completed.
//
// See also |SSL_CTX_set_select_certificate_cb|.
#define SSL_ERROR_PENDING_CERTIFICATE 12
// SSL_ERROR_WANT_PRIVATE_KEY_OPERATION indicates the operation failed because
// a private key operation was unfinished. The caller may retry the operation
// when the private key operation is complete.
//
// See also |SSL_set_private_key_method| and
// |SSL_CTX_set_private_key_method|.
#define SSL_ERROR_WANT_PRIVATE_KEY_OPERATION 13
// SSL_ERROR_PENDING_TICKET indicates that a ticket decryption is pending. The
// caller may retry the operation when the decryption is ready.
//
// See also |SSL_CTX_set_ticket_aead_method|.
#define SSL_ERROR_PENDING_TICKET 14
// SSL_ERROR_EARLY_DATA_REJECTED indicates that early data was rejected. The
// caller should treat this as a connection failure and retry any operations
// associated with the rejected early data. |SSL_reset_early_data_reject| may be
// used to reuse the underlying connection for the retry.
#define SSL_ERROR_EARLY_DATA_REJECTED 15
// SSL_ERROR_WANT_CERTIFICATE_VERIFY indicates the operation failed because
// certificate verification was incomplete. The caller may retry the operation
// when certificate verification is complete.
//
// See also |SSL_CTX_set_custom_verify|.
#define SSL_ERROR_WANT_CERTIFICATE_VERIFY 16
#define SSL_ERROR_HANDOFF 17
#define SSL_ERROR_HANDBACK 18
// SSL_set_mtu sets the |ssl|'s MTU in DTLS to |mtu|. It returns one on success
// and zero on failure.
OPENSSL_EXPORT int SSL_set_mtu(SSL *ssl, unsigned mtu);
// DTLSv1_set_initial_timeout_duration sets the initial duration for a DTLS
// handshake timeout.
//
// This duration overrides the default of 1 second, which is the strong
// recommendation of RFC 6347 (see section 4.2.4.1). However, there may exist
// situations where a shorter timeout would be beneficial, such as for
// time-sensitive applications.
OPENSSL_EXPORT void DTLSv1_set_initial_timeout_duration(SSL *ssl,
unsigned duration_ms);
// DTLSv1_get_timeout queries the next DTLS handshake timeout. If there is a
// timeout in progress, it sets |*out| to the time remaining and returns one.
// Otherwise, it returns zero.
//
// When the timeout expires, call |DTLSv1_handle_timeout| to handle the
// retransmit behavior.
//
// NOTE: This function must be queried again whenever the handshake state
// machine changes, including when |DTLSv1_handle_timeout| is called.
OPENSSL_EXPORT int DTLSv1_get_timeout(const SSL *ssl, struct timeval *out);
// DTLSv1_handle_timeout is called when a DTLS handshake timeout expires. If no
// timeout had expired, it returns 0. Otherwise, it retransmits the previous
// flight of handshake messages and returns 1. If too many timeouts had expired
// without progress or an error occurs, it returns -1.
//
// The caller's external timer should be compatible with the one |ssl| queries
// within some fudge factor. Otherwise, the call will be a no-op, but
// |DTLSv1_get_timeout| will return an updated timeout.
//
// If the function returns -1, checking if |SSL_get_error| returns
// |SSL_ERROR_WANT_WRITE| may be used to determine if the retransmit failed due
// to a non-fatal error at the write |BIO|. However, the operation may not be
// retried until the next timeout fires.
//
// WARNING: This function breaks the usual return value convention.
//
// TODO(davidben): This |SSL_ERROR_WANT_WRITE| behavior is kind of bizarre.
OPENSSL_EXPORT int DTLSv1_handle_timeout(SSL *ssl);
// Protocol versions.
#define DTLS1_VERSION_MAJOR 0xfe
#define SSL3_VERSION_MAJOR 0x03
#define SSL3_VERSION 0x0300
#define TLS1_VERSION 0x0301
#define TLS1_1_VERSION 0x0302
#define TLS1_2_VERSION 0x0303
#define TLS1_3_VERSION 0x0304
#define DTLS1_VERSION 0xfeff
#define DTLS1_2_VERSION 0xfefd
#define TLS1_3_DRAFT23_VERSION 0x7f17
#define TLS1_3_DRAFT28_VERSION 0x7f1c
// SSL_CTX_set_min_proto_version sets the minimum protocol version for |ctx| to
// |version|. If |version| is zero, the default minimum version is used. It
// returns one on success and zero if |version| is invalid.
OPENSSL_EXPORT int SSL_CTX_set_min_proto_version(SSL_CTX *ctx,
uint16_t version);
// SSL_CTX_set_max_proto_version sets the maximum protocol version for |ctx| to
// |version|. If |version| is zero, the default maximum version is used. It
// returns one on success and zero if |version| is invalid.
OPENSSL_EXPORT int SSL_CTX_set_max_proto_version(SSL_CTX *ctx,
uint16_t version);
// SSL_set_min_proto_version sets the minimum protocol version for |ssl| to
// |version|. If |version| is zero, the default minimum version is used. It
// returns one on success and zero if |version| is invalid.
OPENSSL_EXPORT int SSL_set_min_proto_version(SSL *ssl, uint16_t version);
// SSL_set_max_proto_version sets the maximum protocol version for |ssl| to
// |version|. If |version| is zero, the default maximum version is used. It
// returns one on success and zero if |version| is invalid.
OPENSSL_EXPORT int SSL_set_max_proto_version(SSL *ssl, uint16_t version);
// SSL_version returns the TLS or DTLS protocol version used by |ssl|, which is
// one of the |*_VERSION| values. (E.g. |TLS1_2_VERSION|.) Before the version
// is negotiated, the result is undefined.
OPENSSL_EXPORT int SSL_version(const SSL *ssl);
// Options.
//
// Options configure protocol behavior.
// SSL_OP_NO_QUERY_MTU, in DTLS, disables querying the MTU from the underlying
// |BIO|. Instead, the MTU is configured with |SSL_set_mtu|.
#define SSL_OP_NO_QUERY_MTU 0x00001000L
// SSL_OP_NO_TICKET disables session ticket support (RFC 5077).
#define SSL_OP_NO_TICKET 0x00004000L
// SSL_OP_CIPHER_SERVER_PREFERENCE configures servers to select ciphers and
// ECDHE curves according to the server's preferences instead of the
// client's.
#define SSL_OP_CIPHER_SERVER_PREFERENCE 0x00400000L
// The following flags toggle individual protocol versions. This is deprecated.
// Use |SSL_CTX_set_min_proto_version| and |SSL_CTX_set_max_proto_version|
// instead.
#define SSL_OP_NO_TLSv1 0x04000000L
#define SSL_OP_NO_TLSv1_2 0x08000000L
#define SSL_OP_NO_TLSv1_1 0x10000000L
#define SSL_OP_NO_TLSv1_3 0x20000000L
#define SSL_OP_NO_DTLSv1 SSL_OP_NO_TLSv1
#define SSL_OP_NO_DTLSv1_2 SSL_OP_NO_TLSv1_2
// SSL_CTX_set_options enables all options set in |options| (which should be one
// or more of the |SSL_OP_*| values, ORed together) in |ctx|. It returns a
// bitmask representing the resulting enabled options.
OPENSSL_EXPORT uint32_t SSL_CTX_set_options(SSL_CTX *ctx, uint32_t options);
// SSL_CTX_clear_options disables all options set in |options| (which should be
// one or more of the |SSL_OP_*| values, ORed together) in |ctx|. It returns a
// bitmask representing the resulting enabled options.
OPENSSL_EXPORT uint32_t SSL_CTX_clear_options(SSL_CTX *ctx, uint32_t options);
// SSL_CTX_get_options returns a bitmask of |SSL_OP_*| values that represent all
// the options enabled for |ctx|.
OPENSSL_EXPORT uint32_t SSL_CTX_get_options(const SSL_CTX *ctx);
// SSL_set_options enables all options set in |options| (which should be one or
// more of the |SSL_OP_*| values, ORed together) in |ssl|. It returns a bitmask
// representing the resulting enabled options.
OPENSSL_EXPORT uint32_t SSL_set_options(SSL *ssl, uint32_t options);
// SSL_clear_options disables all options set in |options| (which should be one
// or more of the |SSL_OP_*| values, ORed together) in |ssl|. It returns a
// bitmask representing the resulting enabled options.
OPENSSL_EXPORT uint32_t SSL_clear_options(SSL *ssl, uint32_t options);
// SSL_get_options returns a bitmask of |SSL_OP_*| values that represent all the
// options enabled for |ssl|.
OPENSSL_EXPORT uint32_t SSL_get_options(const SSL *ssl);
// Modes.
//
// Modes configure API behavior.
// SSL_MODE_ENABLE_PARTIAL_WRITE, in TLS, allows |SSL_write| to complete with a
// partial result when the only part of the input was written in a single
// record. In DTLS, it does nothing.
#define SSL_MODE_ENABLE_PARTIAL_WRITE 0x00000001L
// SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER, in TLS, allows retrying an incomplete
// |SSL_write| with a different buffer. However, |SSL_write| still assumes the
// buffer contents are unchanged. This is not the default to avoid the
// misconception that non-blocking |SSL_write| behaves like non-blocking
// |write|. In DTLS, it does nothing.
#define SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER 0x00000002L
// SSL_MODE_NO_AUTO_CHAIN disables automatically building a certificate chain
// before sending certificates to the peer. This flag is set (and the feature
// disabled) by default.
// TODO(davidben): Remove this behavior. https://crbug.com/boringssl/42.
#define SSL_MODE_NO_AUTO_CHAIN 0x00000008L
// SSL_MODE_ENABLE_FALSE_START allows clients to send application data before
// receipt of ChangeCipherSpec and Finished. This mode enables full handshakes
// to 'complete' in one RTT. See RFC 7918.
//
// When False Start is enabled, |SSL_do_handshake| may succeed before the
// handshake has completely finished. |SSL_write| will function at this point,
// and |SSL_read| will transparently wait for the final handshake leg before
// returning application data. To determine if False Start occurred or when the
// handshake is completely finished, see |SSL_in_false_start|, |SSL_in_init|,
// and |SSL_CB_HANDSHAKE_DONE| from |SSL_CTX_set_info_callback|.
#define SSL_MODE_ENABLE_FALSE_START 0x00000080L
// SSL_MODE_CBC_RECORD_SPLITTING causes multi-byte CBC records in TLS 1.0 to be
// split in two: the first record will contain a single byte and the second will
// contain the remainder. This effectively randomises the IV and prevents BEAST
// attacks.
#define SSL_MODE_CBC_RECORD_SPLITTING 0x00000100L
// SSL_MODE_NO_SESSION_CREATION will cause any attempts to create a session to
// fail with SSL_R_SESSION_MAY_NOT_BE_CREATED. This can be used to enforce that
// session resumption is used for a given SSL*.
#define SSL_MODE_NO_SESSION_CREATION 0x00000200L
// SSL_MODE_SEND_FALLBACK_SCSV sends TLS_FALLBACK_SCSV in the ClientHello.
// To be set only by applications that reconnect with a downgraded protocol
// version; see RFC 7507 for details.
//
// DO NOT ENABLE THIS if your application attempts a normal handshake. Only use
// this in explicit fallback retries, following the guidance in RFC 7507.
#define SSL_MODE_SEND_FALLBACK_SCSV 0x00000400L
// SSL_CTX_set_mode enables all modes set in |mode| (which should be one or more
// of the |SSL_MODE_*| values, ORed together) in |ctx|. It returns a bitmask
// representing the resulting enabled modes.
OPENSSL_EXPORT uint32_t SSL_CTX_set_mode(SSL_CTX *ctx, uint32_t mode);
// SSL_CTX_clear_mode disables all modes set in |mode| (which should be one or
// more of the |SSL_MODE_*| values, ORed together) in |ctx|. It returns a
// bitmask representing the resulting enabled modes.
OPENSSL_EXPORT uint32_t SSL_CTX_clear_mode(SSL_CTX *ctx, uint32_t mode);
// SSL_CTX_get_mode returns a bitmask of |SSL_MODE_*| values that represent all
// the modes enabled for |ssl|.
OPENSSL_EXPORT uint32_t SSL_CTX_get_mode(const SSL_CTX *ctx);
// SSL_set_mode enables all modes set in |mode| (which should be one or more of
// the |SSL_MODE_*| values, ORed together) in |ssl|. It returns a bitmask
// representing the resulting enabled modes.
OPENSSL_EXPORT uint32_t SSL_set_mode(SSL *ssl, uint32_t mode);
// SSL_clear_mode disables all modes set in |mode| (which should be one or more
// of the |SSL_MODE_*| values, ORed together) in |ssl|. It returns a bitmask
// representing the resulting enabled modes.
OPENSSL_EXPORT uint32_t SSL_clear_mode(SSL *ssl, uint32_t mode);
// SSL_get_mode returns a bitmask of |SSL_MODE_*| values that represent all the
// modes enabled for |ssl|.
OPENSSL_EXPORT uint32_t SSL_get_mode(const SSL *ssl);
// SSL_CTX_set0_buffer_pool sets a |CRYPTO_BUFFER_POOL| that will be used to
// store certificates. This can allow multiple connections to share
// certificates and thus save memory.
//
// The SSL_CTX does not take ownership of |pool| and the caller must ensure
// that |pool| outlives |ctx| and all objects linked to it, including |SSL|,
// |X509| and |SSL_SESSION| objects. Basically, don't ever free |pool|.
OPENSSL_EXPORT void SSL_CTX_set0_buffer_pool(SSL_CTX *ctx,
CRYPTO_BUFFER_POOL *pool);
// Configuring certificates and private keys.
//
// These functions configure the connection's leaf certificate, private key, and
// certificate chain. The certificate chain is ordered leaf to root (as sent on
// the wire) but does not include the leaf. Both client and server certificates
// use these functions.
//
// Certificates and keys may be configured before the handshake or dynamically
// in the early callback and certificate callback.
// SSL_CTX_use_certificate sets |ctx|'s leaf certificate to |x509|. It returns
// one on success and zero on failure.
OPENSSL_EXPORT int SSL_CTX_use_certificate(SSL_CTX *ctx, X509 *x509);
// SSL_use_certificate sets |ssl|'s leaf certificate to |x509|. It returns one
// on success and zero on failure.
OPENSSL_EXPORT int SSL_use_certificate(SSL *ssl, X509 *x509);
// SSL_CTX_use_PrivateKey sets |ctx|'s private key to |pkey|. It returns one on
// success and zero on failure.
OPENSSL_EXPORT int SSL_CTX_use_PrivateKey(SSL_CTX *ctx, EVP_PKEY *pkey);
// SSL_use_PrivateKey sets |ssl|'s private key to |pkey|. It returns one on
// success and zero on failure.
OPENSSL_EXPORT int SSL_use_PrivateKey(SSL *ssl, EVP_PKEY *pkey);
// SSL_CTX_set0_chain sets |ctx|'s certificate chain, excluding the leaf, to
// |chain|. On success, it returns one and takes ownership of |chain|.
// Otherwise, it returns zero.
OPENSSL_EXPORT int SSL_CTX_set0_chain(SSL_CTX *ctx, STACK_OF(X509) *chain);
// SSL_CTX_set1_chain sets |ctx|'s certificate chain, excluding the leaf, to
// |chain|. It returns one on success and zero on failure. The caller retains
// ownership of |chain| and may release it freely.
OPENSSL_EXPORT int SSL_CTX_set1_chain(SSL_CTX *ctx, STACK_OF(X509) *chain);
// SSL_set0_chain sets |ssl|'s certificate chain, excluding the leaf, to
// |chain|. On success, it returns one and takes ownership of |chain|.
// Otherwise, it returns zero.
OPENSSL_EXPORT int SSL_set0_chain(SSL *ssl, STACK_OF(X509) *chain);
// SSL_set1_chain sets |ssl|'s certificate chain, excluding the leaf, to
// |chain|. It returns one on success and zero on failure. The caller retains
// ownership of |chain| and may release it freely.
OPENSSL_EXPORT int SSL_set1_chain(SSL *ssl, STACK_OF(X509) *chain);
// SSL_CTX_add0_chain_cert appends |x509| to |ctx|'s certificate chain. On
// success, it returns one and takes ownership of |x509|. Otherwise, it returns
// zero.
OPENSSL_EXPORT int SSL_CTX_add0_chain_cert(SSL_CTX *ctx, X509 *x509);
// SSL_CTX_add1_chain_cert appends |x509| to |ctx|'s certificate chain. It
// returns one on success and zero on failure. The caller retains ownership of
// |x509| and may release it freely.
OPENSSL_EXPORT int SSL_CTX_add1_chain_cert(SSL_CTX *ctx, X509 *x509);
// SSL_add0_chain_cert appends |x509| to |ctx|'s certificate chain. On success,
// it returns one and takes ownership of |x509|. Otherwise, it returns zero.
OPENSSL_EXPORT int SSL_add0_chain_cert(SSL *ssl, X509 *x509);
// SSL_CTX_add_extra_chain_cert calls |SSL_CTX_add0_chain_cert|.
OPENSSL_EXPORT int SSL_CTX_add_extra_chain_cert(SSL_CTX *ctx, X509 *x509);
// SSL_add1_chain_cert appends |x509| to |ctx|'s certificate chain. It returns
// one on success and zero on failure. The caller retains ownership of |x509|
// and may release it freely.
OPENSSL_EXPORT int SSL_add1_chain_cert(SSL *ssl, X509 *x509);
// SSL_CTX_clear_chain_certs clears |ctx|'s certificate chain and returns
// one.
OPENSSL_EXPORT int SSL_CTX_clear_chain_certs(SSL_CTX *ctx);
// SSL_CTX_clear_extra_chain_certs calls |SSL_CTX_clear_chain_certs|.
OPENSSL_EXPORT int SSL_CTX_clear_extra_chain_certs(SSL_CTX *ctx);
// SSL_clear_chain_certs clears |ssl|'s certificate chain and returns one.
OPENSSL_EXPORT int SSL_clear_chain_certs(SSL *ssl);
// SSL_CTX_set_cert_cb sets a callback that is called to select a certificate.
// The callback returns one on success, zero on internal error, and a negative
// number on failure or to pause the handshake. If the handshake is paused,
// |SSL_get_error| will return |SSL_ERROR_WANT_X509_LOOKUP|.
//
// On the client, the callback may call |SSL_get0_certificate_types| and
// |SSL_get_client_CA_list| for information on the server's certificate
// request.
//
// On the server, the callback will be called on non-resumption handshakes,
// after extensions have been processed.
OPENSSL_EXPORT void SSL_CTX_set_cert_cb(SSL_CTX *ctx,
int (*cb)(SSL *ssl, void *arg),
void *arg);
// SSL_set_cert_cb sets a callback that is called to select a certificate. The
// callback returns one on success, zero on internal error, and a negative
// number on failure or to pause the handshake. If the handshake is paused,
// |SSL_get_error| will return |SSL_ERROR_WANT_X509_LOOKUP|.
//
// On the client, the callback may call |SSL_get0_certificate_types| and
// |SSL_get_client_CA_list| for information on the server's certificate
// request.
OPENSSL_EXPORT void SSL_set_cert_cb(SSL *ssl, int (*cb)(SSL *ssl, void *arg),
void *arg);
// SSL_get0_certificate_types, for a client, sets |*out_types| to an array
// containing the client certificate types requested by a server. It returns the
// length of the array. Note this list is always empty in TLS 1.3. The server
// will instead send signature algorithms. See
// |SSL_get0_peer_verify_algorithms|.
//
// The behavior of this function is undefined except during the callbacks set by
// by |SSL_CTX_set_cert_cb| and |SSL_CTX_set_client_cert_cb| or when the
// handshake is paused because of them.
OPENSSL_EXPORT size_t SSL_get0_certificate_types(const SSL *ssl,
const uint8_t **out_types);
// SSL_get0_peer_verify_algorithms sets |*out_sigalgs| to an array containing
// the signature algorithms the peer is able to verify. It returns the length of
// the array. Note these values are only sent starting TLS 1.2 and only
// mandatory starting TLS 1.3. If not sent, the empty array is returned. For the
// historical client certificate types list, see |SSL_get0_certificate_types|.
//
// The behavior of this function is undefined except during the callbacks set by
// by |SSL_CTX_set_cert_cb| and |SSL_CTX_set_client_cert_cb| or when the
// handshake is paused because of them.
OPENSSL_EXPORT size_t
SSL_get0_peer_verify_algorithms(const SSL *ssl, const uint16_t **out_sigalgs);
// SSL_certs_clear resets the private key, leaf certificate, and certificate
// chain of |ssl|.
OPENSSL_EXPORT void SSL_certs_clear(SSL *ssl);
// SSL_CTX_check_private_key returns one if the certificate and private key
// configured in |ctx| are consistent and zero otherwise.
OPENSSL_EXPORT int SSL_CTX_check_private_key(const SSL_CTX *ctx);
// SSL_check_private_key returns one if the certificate and private key
// configured in |ssl| are consistent and zero otherwise.
OPENSSL_EXPORT int SSL_check_private_key(const SSL *ssl);
// SSL_CTX_get0_certificate returns |ctx|'s leaf certificate.
OPENSSL_EXPORT X509 *SSL_CTX_get0_certificate(const SSL_CTX *ctx);
// SSL_get_certificate returns |ssl|'s leaf certificate.
OPENSSL_EXPORT X509 *SSL_get_certificate(const SSL *ssl);
// SSL_CTX_get0_privatekey returns |ctx|'s private key.
OPENSSL_EXPORT EVP_PKEY *SSL_CTX_get0_privatekey(const SSL_CTX *ctx);
// SSL_get_privatekey returns |ssl|'s private key.
OPENSSL_EXPORT EVP_PKEY *SSL_get_privatekey(const SSL *ssl);
// SSL_CTX_get0_chain_certs sets |*out_chain| to |ctx|'s certificate chain and
// returns one.
OPENSSL_EXPORT int SSL_CTX_get0_chain_certs(const SSL_CTX *ctx,
STACK_OF(X509) **out_chain);
// SSL_CTX_get_extra_chain_certs calls |SSL_CTX_get0_chain_certs|.
OPENSSL_EXPORT int SSL_CTX_get_extra_chain_certs(const SSL_CTX *ctx,
STACK_OF(X509) **out_chain);
// SSL_get0_chain_certs sets |*out_chain| to |ssl|'s certificate chain and
// returns one.
OPENSSL_EXPORT int SSL_get0_chain_certs(const SSL *ssl,
STACK_OF(X509) **out_chain);
// SSL_CTX_set_signed_cert_timestamp_list sets the list of signed certificate
// timestamps that is sent to clients that request it. The |list| argument must
// contain one or more SCT structures serialised as a SignedCertificateTimestamp
// List (see https://tools.ietf.org/html/rfc6962#section-3.3) – i.e. each SCT
// is prefixed by a big-endian, uint16 length and the concatenation of one or
// more such prefixed SCTs are themselves also prefixed by a uint16 length. It
// returns one on success and zero on error. The caller retains ownership of
// |list|.
OPENSSL_EXPORT int SSL_CTX_set_signed_cert_timestamp_list(SSL_CTX *ctx,
const uint8_t *list,
size_t list_len);
// SSL_set_signed_cert_timestamp_list sets the list of signed certificate
// timestamps that is sent to clients that request is. The same format as the
// one used for |SSL_CTX_set_signed_cert_timestamp_list| applies. The caller
// retains ownership of |list|.
OPENSSL_EXPORT int SSL_set_signed_cert_timestamp_list(SSL *ctx,
const uint8_t *list,
size_t list_len);
// SSL_CTX_set_ocsp_response sets the OCSP response that is sent to clients
// which request it. It returns one on success and zero on error. The caller
// retains ownership of |response|.
OPENSSL_EXPORT int SSL_CTX_set_ocsp_response(SSL_CTX *ctx,
const uint8_t *response,
size_t response_len);
// SSL_set_ocsp_response sets the OCSP response that is sent to clients which
// request it. It returns one on success and zero on error. The caller retains
// ownership of |response|.
OPENSSL_EXPORT int SSL_set_ocsp_response(SSL *ssl,
const uint8_t *response,
size_t response_len);
// SSL_SIGN_* are signature algorithm values as defined in TLS 1.3.
#define SSL_SIGN_RSA_PKCS1_SHA1 0x0201
#define SSL_SIGN_RSA_PKCS1_SHA256 0x0401
#define SSL_SIGN_RSA_PKCS1_SHA384 0x0501
#define SSL_SIGN_RSA_PKCS1_SHA512 0x0601
#define SSL_SIGN_ECDSA_SHA1 0x0203
#define SSL_SIGN_ECDSA_SECP256R1_SHA256 0x0403
#define SSL_SIGN_ECDSA_SECP384R1_SHA384 0x0503
#define SSL_SIGN_ECDSA_SECP521R1_SHA512 0x0603
#define SSL_SIGN_RSA_PSS_RSAE_SHA256 0x0804
#define SSL_SIGN_RSA_PSS_RSAE_SHA384 0x0805
#define SSL_SIGN_RSA_PSS_RSAE_SHA512 0x0806
#define SSL_SIGN_ED25519 0x0807
// SSL_SIGN_RSA_PKCS1_MD5_SHA1 is an internal signature algorithm used to
// specify raw RSASSA-PKCS1-v1_5 with an MD5/SHA-1 concatenation, as used in TLS
// before TLS 1.2.
#define SSL_SIGN_RSA_PKCS1_MD5_SHA1 0xff01
// SSL_get_signature_algorithm_name returns a human-readable name for |sigalg|,
// or NULL if unknown. If |include_curve| is one, the curve for ECDSA algorithms
// is included as in TLS 1.3. Otherwise, it is excluded as in TLS 1.2.
OPENSSL_EXPORT const char *SSL_get_signature_algorithm_name(uint16_t sigalg,
int include_curve);
// SSL_get_signature_algorithm_key_type returns the key type associated with
// |sigalg| as an |EVP_PKEY_*| constant or |EVP_PKEY_NONE| if unknown.
OPENSSL_EXPORT int SSL_get_signature_algorithm_key_type(uint16_t sigalg);
// SSL_get_signature_algorithm_digest returns the digest function associated
// with |sigalg| or |NULL| if |sigalg| has no prehash (Ed25519) or is unknown.
OPENSSL_EXPORT const EVP_MD *SSL_get_signature_algorithm_digest(
uint16_t sigalg);
// SSL_is_signature_algorithm_rsa_pss returns one if |sigalg| is an RSA-PSS
// signature algorithm and zero otherwise.
OPENSSL_EXPORT int SSL_is_signature_algorithm_rsa_pss(uint16_t sigalg);
// SSL_CTX_set_signing_algorithm_prefs configures |ctx| to use |prefs| as the
// preference list when signing with |ctx|'s private key. It returns one on
// success and zero on error. |prefs| should not include the internal-only value
// |SSL_SIGN_RSA_PKCS1_MD5_SHA1|.
OPENSSL_EXPORT int SSL_CTX_set_signing_algorithm_prefs(SSL_CTX *ctx,
const uint16_t *prefs,
size_t num_prefs);
// SSL_set_signing_algorithm_prefs configures |ssl| to use |prefs| as the
// preference list when signing with |ssl|'s private key. It returns one on
// success and zero on error. |prefs| should not include the internal-only value
// |SSL_SIGN_RSA_PKCS1_MD5_SHA1|.
OPENSSL_EXPORT int SSL_set_signing_algorithm_prefs(SSL *ssl,
const uint16_t *prefs,
size_t num_prefs);
// Certificate and private key convenience functions.
// SSL_CTX_set_chain_and_key sets the certificate chain and private key for a
// TLS client or server. References to the given |CRYPTO_BUFFER| and |EVP_PKEY|
// objects are added as needed. Exactly one of |privkey| or |privkey_method|
// may be non-NULL. Returns one on success and zero on error.
OPENSSL_EXPORT int SSL_CTX_set_chain_and_key(
SSL_CTX *ctx, CRYPTO_BUFFER *const *certs, size_t num_certs,
EVP_PKEY *privkey, const SSL_PRIVATE_KEY_METHOD *privkey_method);
// SSL_set_chain_and_key sets the certificate chain and private key for a TLS
// client or server. References to the given |CRYPTO_BUFFER| and |EVP_PKEY|
// objects are added as needed. Exactly one of |privkey| or |privkey_method|
// may be non-NULL. Returns one on success and zero on error.
OPENSSL_EXPORT int SSL_set_chain_and_key(
SSL *ssl, CRYPTO_BUFFER *const *certs, size_t num_certs, EVP_PKEY *privkey,
const SSL_PRIVATE_KEY_METHOD *privkey_method);
// SSL_CTX_use_RSAPrivateKey sets |ctx|'s private key to |rsa|. It returns one
// on success and zero on failure.
OPENSSL_EXPORT int SSL_CTX_use_RSAPrivateKey(SSL_CTX *ctx, RSA *rsa);
// SSL_use_RSAPrivateKey sets |ctx|'s private key to |rsa|. It returns one on
// success and zero on failure.
OPENSSL_EXPORT int SSL_use_RSAPrivateKey(SSL *ssl, RSA *rsa);
// The following functions configure certificates or private keys but take as
// input DER-encoded structures. They return one on success and zero on
// failure.
OPENSSL_EXPORT int SSL_CTX_use_certificate_ASN1(SSL_CTX *ctx, size_t der_len,
const uint8_t *der);
OPENSSL_EXPORT int SSL_use_certificate_ASN1(SSL *ssl, const uint8_t *der,
size_t der_len);
OPENSSL_EXPORT int SSL_CTX_use_PrivateKey_ASN1(int pk, SSL_CTX *ctx,
const uint8_t *der,
size_t der_len);
OPENSSL_EXPORT int SSL_use_PrivateKey_ASN1(int type, SSL *ssl,
const uint8_t *der, size_t der_len);
OPENSSL_EXPORT int SSL_CTX_use_RSAPrivateKey_ASN1(SSL_CTX *ctx,
const uint8_t *der,
size_t der_len);
OPENSSL_EXPORT int SSL_use_RSAPrivateKey_ASN1(SSL *ssl, const uint8_t *der,
size_t der_len);
// The following functions configure certificates or private keys but take as
// input files to read from. They return one on success and zero on failure. The
// |type| parameter is one of the |SSL_FILETYPE_*| values and determines whether
// the file's contents are read as PEM or DER.
#define SSL_FILETYPE_PEM 1
#define SSL_FILETYPE_ASN1 2
OPENSSL_EXPORT int SSL_CTX_use_RSAPrivateKey_file(SSL_CTX *ctx,
const char *file,
int type);
OPENSSL_EXPORT int SSL_use_RSAPrivateKey_file(SSL *ssl, const char *file,
int type);
OPENSSL_EXPORT int SSL_CTX_use_certificate_file(SSL_CTX *ctx, const char *file,
int type);
OPENSSL_EXPORT int SSL_use_certificate_file(SSL *ssl, const char *file,
int type);
OPENSSL_EXPORT int SSL_CTX_use_PrivateKey_file(SSL_CTX *ctx, const char *file,
int type);
OPENSSL_EXPORT int SSL_use_PrivateKey_file(SSL *ssl, const char *file,
int type);
// SSL_CTX_use_certificate_chain_file configures certificates for |ctx|. It
// reads the contents of |file| as a PEM-encoded leaf certificate followed
// optionally by the certificate chain to send to the peer. It returns one on
// success and zero on failure.
OPENSSL_EXPORT int SSL_CTX_use_certificate_chain_file(SSL_CTX *ctx,
const char *file);
// SSL_CTX_set_default_passwd_cb sets the password callback for PEM-based
// convenience functions called on |ctx|.
OPENSSL_EXPORT void SSL_CTX_set_default_passwd_cb(SSL_CTX *ctx,
pem_password_cb *cb);
// SSL_CTX_get_default_passwd_cb returns the callback set by
// |SSL_CTX_set_default_passwd_cb|.
OPENSSL_EXPORT pem_password_cb *SSL_CTX_get_default_passwd_cb(
const SSL_CTX *ctx);
// SSL_CTX_set_default_passwd_cb_userdata sets the userdata parameter for
// |ctx|'s password callback.
OPENSSL_EXPORT void SSL_CTX_set_default_passwd_cb_userdata(SSL_CTX *ctx,
void *data);
// SSL_CTX_get_default_passwd_cb_userdata returns the userdata parameter set by
// |SSL_CTX_set_default_passwd_cb_userdata|.
OPENSSL_EXPORT void *SSL_CTX_get_default_passwd_cb_userdata(const SSL_CTX *ctx);
// Custom private keys.
enum ssl_private_key_result_t {
ssl_private_key_success,
ssl_private_key_retry,
ssl_private_key_failure,
};
// ssl_private_key_method_st (aka |SSL_PRIVATE_KEY_METHOD|) describes private
// key hooks. This is used to off-load signing operations to a custom,
// potentially asynchronous, backend. Metadata about the key such as the type
// and size are parsed out of the certificate.
struct ssl_private_key_method_st {
// sign signs the message |in| in using the specified signature algorithm. On
// success, it returns |ssl_private_key_success| and writes at most |max_out|
// bytes of signature data to |out| and sets |*out_len| to the number of bytes
// written. On failure, it returns |ssl_private_key_failure|. If the operation
// has not completed, it returns |ssl_private_key_retry|. |sign| should
// arrange for the high-level operation on |ssl| to be retried when the
// operation is completed. This will result in a call to |complete|.
//
// |signature_algorithm| is one of the |SSL_SIGN_*| values, as defined in TLS
// 1.3. Note that, in TLS 1.2, ECDSA algorithms do not require that curve
// sizes match hash sizes, so the curve portion of |SSL_SIGN_ECDSA_*| values
// must be ignored. BoringSSL will internally handle the curve matching logic
// where appropriate.
//
// It is an error to call |sign| while another private key operation is in
// progress on |ssl|.
enum ssl_private_key_result_t (*sign)(SSL *ssl, uint8_t *out, size_t *out_len,
size_t max_out,
uint16_t signature_algorithm,
const uint8_t *in, size_t in_len);
// decrypt decrypts |in_len| bytes of encrypted data from |in|. On success it
// returns |ssl_private_key_success|, writes at most |max_out| bytes of
// decrypted data to |out| and sets |*out_len| to the actual number of bytes
// written. On failure it returns |ssl_private_key_failure|. If the operation
// has not completed, it returns |ssl_private_key_retry|. The caller should
// arrange for the high-level operation on |ssl| to be retried when the
// operation is completed, which will result in a call to |complete|. This
// function only works with RSA keys and should perform a raw RSA decryption
// operation with no padding.
//
// It is an error to call |decrypt| while another private key operation is in
// progress on |ssl|.
enum ssl_private_key_result_t (*decrypt)(SSL *ssl, uint8_t *out,
size_t *out_len, size_t max_out,
const uint8_t *in, size_t in_len);
// complete completes a pending operation. If the operation has completed, it
// returns |ssl_private_key_success| and writes the result to |out| as in
// |sign|. Otherwise, it returns |ssl_private_key_failure| on failure and
// |ssl_private_key_retry| if the operation is still in progress.
//
// |complete| may be called arbitrarily many times before completion, but it
// is an error to call |complete| if there is no pending operation in progress
// on |ssl|.
enum ssl_private_key_result_t (*complete)(SSL *ssl, uint8_t *out,
size_t *out_len, size_t max_out);
};
// SSL_set_private_key_method configures a custom private key on |ssl|.
// |key_method| must remain valid for the lifetime of |ssl|.
OPENSSL_EXPORT void SSL_set_private_key_method(
SSL *ssl, const SSL_PRIVATE_KEY_METHOD *key_method);
// SSL_CTX_set_private_key_method configures a custom private key on |ctx|.
// |key_method| must remain valid for the lifetime of |ctx|.
OPENSSL_EXPORT void SSL_CTX_set_private_key_method(
SSL_CTX *ctx, const SSL_PRIVATE_KEY_METHOD *key_method);
// Cipher suites.
//
// |SSL_CIPHER| objects represent cipher suites.
DEFINE_CONST_STACK_OF(SSL_CIPHER)
// SSL_get_cipher_by_value returns the structure representing a TLS cipher
// suite based on its assigned number, or NULL if unknown. See
// https://www.iana.org/assignments/tls-parameters/tls-parameters.xhtml#tls-parameters-4.
OPENSSL_EXPORT const SSL_CIPHER *SSL_get_cipher_by_value(uint16_t value);
// SSL_CIPHER_get_id returns |cipher|'s id. It may be cast to a |uint16_t| to
// get the cipher suite value.
OPENSSL_EXPORT uint32_t SSL_CIPHER_get_id(const SSL_CIPHER *cipher);
// SSL_CIPHER_is_aead returns one if |cipher| uses an AEAD cipher.
OPENSSL_EXPORT int SSL_CIPHER_is_aead(const SSL_CIPHER *cipher);
// SSL_CIPHER_is_block_cipher returns one if |cipher| is a block cipher.
OPENSSL_EXPORT int SSL_CIPHER_is_block_cipher(const SSL_CIPHER *cipher);
// SSL_CIPHER_get_cipher_nid returns the NID for |cipher|'s bulk
// cipher. Possible values are |NID_aes_128_gcm|, |NID_aes_256_gcm|,
// |NID_chacha20_poly1305|, |NID_aes_128_cbc|, |NID_aes_256_cbc|, and
// |NID_des_ede3_cbc|.
OPENSSL_EXPORT int SSL_CIPHER_get_cipher_nid(const SSL_CIPHER *cipher);
// SSL_CIPHER_get_digest_nid returns the NID for |cipher|'s HMAC if it is a
// legacy cipher suite. For modern AEAD-based ciphers (see
// |SSL_CIPHER_is_aead|), it returns |NID_undef|.
//
// Note this function only returns the legacy HMAC digest, not the PRF hash.
OPENSSL_EXPORT int SSL_CIPHER_get_digest_nid(const SSL_CIPHER *cipher);
// SSL_CIPHER_get_kx_nid returns the NID for |cipher|'s key exchange. This may
// be |NID_kx_rsa|, |NID_kx_ecdhe|, or |NID_kx_psk| for TLS 1.2. In TLS 1.3,
// cipher suites do not specify the key exchange, so this function returns
// |NID_kx_any|.
OPENSSL_EXPORT int SSL_CIPHER_get_kx_nid(const SSL_CIPHER *cipher);
// SSL_CIPHER_get_auth_nid returns the NID for |cipher|'s authentication
// type. This may be |NID_auth_rsa|, |NID_auth_ecdsa|, or |NID_auth_psk| for TLS
// 1.2. In TLS 1.3, cipher suites do not specify authentication, so this
// function returns |NID_auth_any|.
OPENSSL_EXPORT int SSL_CIPHER_get_auth_nid(const SSL_CIPHER *cipher);
// SSL_CIPHER_get_prf_nid retuns the NID for |cipher|'s PRF hash. If |cipher| is
// a pre-TLS-1.2 cipher, it returns |NID_md5_sha1| but note these ciphers use
// SHA-256 in TLS 1.2. Other return values may be treated uniformly in all
// applicable versions.
OPENSSL_EXPORT int SSL_CIPHER_get_prf_nid(const SSL_CIPHER *cipher);
// SSL_CIPHER_get_min_version returns the minimum protocol version required
// for |cipher|.
OPENSSL_EXPORT uint16_t SSL_CIPHER_get_min_version(const SSL_CIPHER *cipher);
// SSL_CIPHER_get_max_version returns the maximum protocol version that
// supports |cipher|.
OPENSSL_EXPORT uint16_t SSL_CIPHER_get_max_version(const SSL_CIPHER *cipher);
// SSL_CIPHER_standard_name returns the standard IETF name for |cipher|. For
// example, "TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256".
OPENSSL_EXPORT const char *SSL_CIPHER_standard_name(const SSL_CIPHER *cipher);
// SSL_CIPHER_get_name returns the OpenSSL name of |cipher|. For example,
// "ECDHE-RSA-AES128-GCM-SHA256".
OPENSSL_EXPORT const char *SSL_CIPHER_get_name(const SSL_CIPHER *cipher);
// SSL_CIPHER_get_kx_name returns a string that describes the key-exchange
// method used by |cipher|. For example, "ECDHE_ECDSA". TLS 1.3 AEAD-only
// ciphers return the string "GENERIC".
OPENSSL_EXPORT const char *SSL_CIPHER_get_kx_name(const SSL_CIPHER *cipher);
// SSL_CIPHER_get_bits returns the strength, in bits, of |cipher|. If
// |out_alg_bits| is not NULL, it writes the number of bits consumed by the
// symmetric algorithm to |*out_alg_bits|.
OPENSSL_EXPORT int SSL_CIPHER_get_bits(const SSL_CIPHER *cipher,
int *out_alg_bits);
// Cipher suite configuration.
//
// OpenSSL uses a mini-language to configure cipher suites. The language
// maintains an ordered list of enabled ciphers, along with an ordered list of
// disabled but available ciphers. Initially, all ciphers are disabled with a
// default ordering. The cipher string is then interpreted as a sequence of
// directives, separated by colons, each of which modifies this state.
//
// Most directives consist of a one character or empty opcode followed by a
// selector which matches a subset of available ciphers.
//
// Available opcodes are:
//
// The empty opcode enables and appends all matching disabled ciphers to the
// end of the enabled list. The newly appended ciphers are ordered relative to
// each other matching their order in the disabled list.
//
// |-| disables all matching enabled ciphers and prepends them to the disabled
// list, with relative order from the enabled list preserved. This means the
// most recently disabled ciphers get highest preference relative to other
// disabled ciphers if re-enabled.
//
// |+| moves all matching enabled ciphers to the end of the enabled list, with
// relative order preserved.
//
// |!| deletes all matching ciphers, enabled or not, from either list. Deleted
// ciphers will not matched by future operations.
//
// A selector may be a specific cipher (using either the standard or OpenSSL
// name for the cipher) or one or more rules separated by |+|. The final
// selector matches the intersection of each rule. For instance, |AESGCM+aECDSA|
// matches ECDSA-authenticated AES-GCM ciphers.
//
// Available cipher rules are:
//
// |ALL| matches all ciphers.
//
// |kRSA|, |kDHE|, |kECDHE|, and |kPSK| match ciphers using plain RSA, DHE,
// ECDHE, and plain PSK key exchanges, respectively. Note that ECDHE_PSK is
// matched by |kECDHE| and not |kPSK|.
//
// |aRSA|, |aECDSA|, and |aPSK| match ciphers authenticated by RSA, ECDSA, and
// a pre-shared key, respectively.
//
// |RSA|, |DHE|, |ECDHE|, |PSK|, |ECDSA|, and |PSK| are aliases for the
// corresponding |k*| or |a*| cipher rule. |RSA| is an alias for |kRSA|, not
// |aRSA|.
//
// |3DES|, |AES128|, |AES256|, |AES|, |AESGCM|, |CHACHA20| match ciphers
// whose bulk cipher use the corresponding encryption scheme. Note that
// |AES|, |AES128|, and |AES256| match both CBC and GCM ciphers.
//
// |SHA1|, and its alias |SHA|, match legacy cipher suites using HMAC-SHA1.
//
// Although implemented, authentication-only ciphers match no rules and must be
// explicitly selected by name.
//
// Deprecated cipher rules:
//
// |kEDH|, |EDH|, |kEECDH|, and |EECDH| are legacy aliases for |kDHE|, |DHE|,
// |kECDHE|, and |ECDHE|, respectively.
//
// |HIGH| is an alias for |ALL|.
//
// |FIPS| is an alias for |HIGH|.
//
// |SSLv3| and |TLSv1| match ciphers available in TLS 1.1 or earlier.
// |TLSv1_2| matches ciphers new in TLS 1.2. This is confusing and should not
// be used.
//
// Unknown rules are silently ignored by legacy APIs, and rejected by APIs with
// "strict" in the name, which should be preferred. Cipher lists can be long
// and it's easy to commit typos. Strict functions will also reject the use of
// spaces, semi-colons and commas as alternative separators.
//
// The special |@STRENGTH| directive will sort all enabled ciphers by strength.
//
// The |DEFAULT| directive, when appearing at the front of the string, expands
// to the default ordering of available ciphers.
//
// If configuring a server, one may also configure equal-preference groups to
// partially respect the client's preferences when
// |SSL_OP_CIPHER_SERVER_PREFERENCE| is enabled. Ciphers in an equal-preference
// group have equal priority and use the client order. This may be used to
// enforce that AEADs are preferred but select AES-GCM vs. ChaCha20-Poly1305
// based on client preferences. An equal-preference is specified with square
// brackets, combining multiple selectors separated by |. For example:
//
// [ECDHE-ECDSA-CHACHA20-POLY1305|ECDHE-ECDSA-AES128-GCM-SHA256]
//
// Once an equal-preference group is used, future directives must be
// opcode-less. Inside an equal-preference group, spaces are not allowed.
//
// TLS 1.3 ciphers do not participate in this mechanism and instead have a
// built-in preference order. Functions to set cipher lists do not affect TLS
// 1.3, and functions to query the cipher list do not include TLS 1.3
// ciphers.
// SSL_DEFAULT_CIPHER_LIST is the default cipher suite configuration. It is
// substituted when a cipher string starts with 'DEFAULT'.
#define SSL_DEFAULT_CIPHER_LIST "ALL"
// SSL_CTX_set_strict_cipher_list configures the cipher list for |ctx|,
// evaluating |str| as a cipher string and returning error if |str| contains
// anything meaningless. It returns one on success and zero on failure.
OPENSSL_EXPORT int SSL_CTX_set_strict_cipher_list(SSL_CTX *ctx,
const char *str);
// SSL_CTX_set_cipher_list configures the cipher list for |ctx|, evaluating
// |str| as a cipher string. It returns one on success and zero on failure.
//
// Prefer to use |SSL_CTX_set_strict_cipher_list|. This function tolerates
// garbage inputs, unless an empty cipher list results.
OPENSSL_EXPORT int SSL_CTX_set_cipher_list(SSL_CTX *ctx, const char *str);
// SSL_set_strict_cipher_list configures the cipher list for |ssl|, evaluating
// |str| as a cipher string and returning error if |str| contains anything
// meaningless. It returns one on success and zero on failure.
OPENSSL_EXPORT int SSL_set_strict_cipher_list(SSL *ssl, const char *str);
// SSL_set_cipher_list configures the cipher list for |ssl|, evaluating |str| as
// a cipher string. It returns one on success and zero on failure.
//
// Prefer to use |SSL_set_strict_cipher_list|. This function tolerates garbage
// inputs, unless an empty cipher list results.
OPENSSL_EXPORT int SSL_set_cipher_list(SSL *ssl, const char *str);
// SSL_CTX_get_ciphers returns the cipher list for |ctx|, in order of
// preference.
OPENSSL_EXPORT STACK_OF(SSL_CIPHER) *SSL_CTX_get_ciphers(const SSL_CTX *ctx);
// SSL_CTX_cipher_in_group returns one if the |i|th cipher (see
// |SSL_CTX_get_ciphers|) is in the same equipreference group as the one
// following it and zero otherwise.
OPENSSL_EXPORT int SSL_CTX_cipher_in_group(const SSL_CTX *ctx, size_t i);
// SSL_get_ciphers returns the cipher list for |ssl|, in order of preference.
OPENSSL_EXPORT STACK_OF(SSL_CIPHER) *SSL_get_ciphers(const SSL *ssl);
// Connection information.
// SSL_is_init_finished returns one if |ssl| has completed its initial handshake
// and has no pending handshake. It returns zero otherwise.
OPENSSL_EXPORT int SSL_is_init_finished(const SSL *ssl);
// SSL_in_init returns one if |ssl| has a pending handshake and zero
// otherwise.
OPENSSL_EXPORT int SSL_in_init(const SSL *ssl);
// SSL_in_false_start returns one if |ssl| has a pending handshake that is in
// False Start. |SSL_write| may be called at this point without waiting for the
// peer, but |SSL_read| will complete the handshake before accepting application
// data.
//
// See also |SSL_MODE_ENABLE_FALSE_START|.
OPENSSL_EXPORT int SSL_in_false_start(const SSL *ssl);
// SSL_get_peer_certificate returns the peer's leaf certificate or NULL if the
// peer did not use certificates. The caller must call |X509_free| on the
// result to release it.
OPENSSL_EXPORT X509 *SSL_get_peer_certificate(const SSL *ssl);
// SSL_get_peer_cert_chain returns the peer's certificate chain or NULL if
// unavailable or the peer did not use certificates. This is the unverified list
// of certificates as sent by the peer, not the final chain built during
// verification. The caller does not take ownership of the result.
//
// WARNING: This function behaves differently between client and server. If
// |ssl| is a server, the returned chain does not include the leaf certificate.
// If a client, it does.
OPENSSL_EXPORT STACK_OF(X509) *SSL_get_peer_cert_chain(const SSL *ssl);
// SSL_get_peer_full_cert_chain returns the peer's certificate chain, or NULL if
// unavailable or the peer did not use certificates. This is the unverified list
// of certificates as sent by the peer, not the final chain built during
// verification. The caller does not take ownership of the result.
//
// This is the same as |SSL_get_peer_cert_chain| except that this function
// always returns the full chain, i.e. the first element of the return value
// (if any) will be the leaf certificate. In constrast,
// |SSL_get_peer_cert_chain| returns only the intermediate certificates if the
// |ssl| is a server.
OPENSSL_EXPORT STACK_OF(X509) *SSL_get_peer_full_cert_chain(const SSL *ssl);
// SSL_get0_peer_certificates returns the peer's certificate chain, or NULL if
// unavailable or the peer did not use certificates. This is the unverified list
// of certificates as sent by the peer, not the final chain built during
// verification. The caller does not take ownership of the result.
//
// This is the |CRYPTO_BUFFER| variant of |SSL_get_peer_full_cert_chain|.
OPENSSL_EXPORT const STACK_OF(CRYPTO_BUFFER) *
SSL_get0_peer_certificates(const SSL *ssl);
// SSL_get0_signed_cert_timestamp_list sets |*out| and |*out_len| to point to
// |*out_len| bytes of SCT information from the server. This is only valid if
// |ssl| is a client. The SCT information is a SignedCertificateTimestampList
// (including the two leading length bytes).
// See https://tools.ietf.org/html/rfc6962#section-3.3
// If no SCT was received then |*out_len| will be zero on return.
//
// WARNING: the returned data is not guaranteed to be well formed.
OPENSSL_EXPORT void SSL_get0_signed_cert_timestamp_list(const SSL *ssl,
const uint8_t **out,
size_t *out_len);
// SSL_get0_ocsp_response sets |*out| and |*out_len| to point to |*out_len|
// bytes of an OCSP response from the server. This is the DER encoding of an
// OCSPResponse type as defined in RFC 2560.
//
// WARNING: the returned data is not guaranteed to be well formed.
OPENSSL_EXPORT void SSL_get0_ocsp_response(const SSL *ssl, const uint8_t **out,
size_t *out_len);
// SSL_get_tls_unique writes at most |max_out| bytes of the tls-unique value
// for |ssl| to |out| and sets |*out_len| to the number of bytes written. It
// returns one on success or zero on error. In general |max_out| should be at
// least 12.
//
// This function will always fail if the initial handshake has not completed.
// The tls-unique value will change after a renegotiation but, since
// renegotiations can be initiated by the server at any point, the higher-level
// protocol must either leave them disabled or define states in which the
// tls-unique value can be read.
//
// The tls-unique value is defined by
// https://tools.ietf.org/html/rfc5929#section-3.1. Due to a weakness in the
// TLS protocol, tls-unique is broken for resumed connections unless the
// Extended Master Secret extension is negotiated. Thus this function will
// return zero if |ssl| performed session resumption unless EMS was used when
// negotiating the original session.
OPENSSL_EXPORT int SSL_get_tls_unique(const SSL *ssl, uint8_t *out,
size_t *out_len, size_t max_out);
// SSL_get_extms_support returns one if the Extended Master Secret extension or
// TLS 1.3 was negotiated. Otherwise, it returns zero.
OPENSSL_EXPORT int SSL_get_extms_support(const SSL *ssl);
// SSL_get_current_cipher returns the cipher used in the current outgoing
// connection state, or NULL if the null cipher is active.
OPENSSL_EXPORT const SSL_CIPHER *SSL_get_current_cipher(const SSL *ssl);
// SSL_session_reused returns one if |ssl| performed an abbreviated handshake
// and zero otherwise.
//
// TODO(davidben): Hammer down the semantics of this API while a handshake,
// initial or renego, is in progress.
OPENSSL_EXPORT int SSL_session_reused(const SSL *ssl);
// SSL_get_secure_renegotiation_support returns one if the peer supports secure
// renegotiation (RFC 5746) or TLS 1.3. Otherwise, it returns zero.
OPENSSL_EXPORT int SSL_get_secure_renegotiation_support(const SSL *ssl);
// SSL_export_keying_material exports a value derived from the master secret, as
// specified in RFC 5705. It writes |out_len| bytes to |out| given a label and
// optional context. (Since a zero length context is allowed, the |use_context|
// flag controls whether a context is included.)
//
// It returns one on success and zero otherwise.
OPENSSL_EXPORT int SSL_export_keying_material(
SSL *ssl, uint8_t *out, size_t out_len, const char *label, size_t label_len,
const uint8_t *context, size_t context_len, int use_context);
// Sessions.
//
// An |SSL_SESSION| represents an SSL session that may be resumed in an
// abbreviated handshake. It is reference-counted and immutable. Once
// established, an |SSL_SESSION| may be shared by multiple |SSL| objects on
// different threads and must not be modified.
DECLARE_PEM_rw(SSL_SESSION, SSL_SESSION)
// SSL_SESSION_new returns a newly-allocated blank |SSL_SESSION| or NULL on
// error. This may be useful when writing tests but should otherwise not be
// used.
OPENSSL_EXPORT SSL_SESSION *SSL_SESSION_new(const SSL_CTX *ctx);
// SSL_SESSION_up_ref increments the reference count of |session| and returns
// one.
OPENSSL_EXPORT int SSL_SESSION_up_ref(SSL_SESSION *session);
// SSL_SESSION_free decrements the reference count of |session|. If it reaches
// zero, all data referenced by |session| and |session| itself are released.
OPENSSL_EXPORT void SSL_SESSION_free(SSL_SESSION *session);
// SSL_SESSION_to_bytes serializes |in| into a newly allocated buffer and sets
// |*out_data| to that buffer and |*out_len| to its length. The caller takes
// ownership of the buffer and must call |OPENSSL_free| when done. It returns
// one on success and zero on error.
OPENSSL_EXPORT int SSL_SESSION_to_bytes(const SSL_SESSION *in,
uint8_t **out_data, size_t *out_len);
// SSL_SESSION_to_bytes_for_ticket serializes |in|, but excludes the session
// identification information, namely the session ID and ticket.
OPENSSL_EXPORT int SSL_SESSION_to_bytes_for_ticket(const SSL_SESSION *in,
uint8_t **out_data,
size_t *out_len);
// SSL_SESSION_from_bytes parses |in_len| bytes from |in| as an SSL_SESSION. It
// returns a newly-allocated |SSL_SESSION| on success or NULL on error.
OPENSSL_EXPORT SSL_SESSION *SSL_SESSION_from_bytes(
const uint8_t *in, size_t in_len, const SSL_CTX *ctx);
// SSL_SESSION_get_version returns a string describing the TLS or DTLS version
// |session| was established at. For example, "TLSv1.2" or "DTLSv1".
OPENSSL_EXPORT const char *SSL_SESSION_get_version(const SSL_SESSION *session);
// SSL_SESSION_get_protocol_version returns the TLS or DTLS version |session|
// was established at.
OPENSSL_EXPORT uint16_t
SSL_SESSION_get_protocol_version(const SSL_SESSION *session);
// SSL_SESSION_set_protocol_version sets |session|'s TLS or DTLS version to
// |version|. This may be useful when writing tests but should otherwise not be
// used. It returns one on success and zero on error.
OPENSSL_EXPORT int SSL_SESSION_set_protocol_version(SSL_SESSION *session,
uint16_t version);
// SSL_MAX_SSL_SESSION_ID_LENGTH is the maximum length of an SSL session ID.
#define SSL_MAX_SSL_SESSION_ID_LENGTH 32
// SSL_SESSION_get_id returns a pointer to a buffer containing |session|'s
// session ID and sets |*out_len| to its length.
OPENSSL_EXPORT const uint8_t *SSL_SESSION_get_id(const SSL_SESSION *session,
unsigned *out_len);
// SSL_SESSION_set1_id sets |session|'s session ID to |sid|, It returns one on
// success and zero on error. This function may be useful in writing tests but
// otherwise should not be used.
OPENSSL_EXPORT int SSL_SESSION_set1_id(SSL_SESSION *session, const uint8_t *sid,
size_t sid_len);
// SSL_SESSION_get_time returns the time at which |session| was established in
// seconds since the UNIX epoch.
OPENSSL_EXPORT uint64_t SSL_SESSION_get_time(const SSL_SESSION *session);
// SSL_SESSION_get_timeout returns the lifetime of |session| in seconds.
OPENSSL_EXPORT uint32_t SSL_SESSION_get_timeout(const SSL_SESSION *session);
// SSL_SESSION_get0_peer returns the peer leaf certificate stored in
// |session|.
//
// TODO(davidben): This should return a const X509 *.
OPENSSL_EXPORT X509 *SSL_SESSION_get0_peer(const SSL_SESSION *session);
// SSL_SESSION_get0_peer_certificates returns the peer certificate chain stored
// in |session|, or NULL if the peer did not use certificates. This is the
// unverified list of certificates as sent by the peer, not the final chain
// built during verification. The caller does not take ownership of the result.
OPENSSL_EXPORT const STACK_OF(CRYPTO_BUFFER) *
SSL_SESSION_get0_peer_certificates(const SSL_SESSION *session);
// SSL_SESSION_get0_signed_cert_timestamp_list sets |*out| and |*out_len| to
// point to |*out_len| bytes of SCT information stored in |session|. This is
// only valid for client sessions. The SCT information is a
// SignedCertificateTimestampList (including the two leading length bytes). See
// https://tools.ietf.org/html/rfc6962#section-3.3 If no SCT was received then
// |*out_len| will be zero on return.
//
// WARNING: the returned data is not guaranteed to be well formed.
OPENSSL_EXPORT void SSL_SESSION_get0_signed_cert_timestamp_list(
const SSL_SESSION *session, const uint8_t **out, size_t *out_len);
// SSL_SESSION_get0_ocsp_response sets |*out| and |*out_len| to point to
// |*out_len| bytes of an OCSP response from the server. This is the DER
// encoding of an OCSPResponse type as defined in RFC 2560.
//
// WARNING: the returned data is not guaranteed to be well formed.
OPENSSL_EXPORT void SSL_SESSION_get0_ocsp_response(const SSL_SESSION *session,
const uint8_t **out,
size_t *out_len);
// SSL_MAX_MASTER_KEY_LENGTH is the maximum length of a master secret.
#define SSL_MAX_MASTER_KEY_LENGTH 48
// SSL_SESSION_get_master_key writes up to |max_out| bytes of |session|'s master
// secret to |out| and returns the number of bytes written. If |max_out| is
// zero, it returns the size of the master secret.
OPENSSL_EXPORT size_t SSL_SESSION_get_master_key(const SSL_SESSION *session,
uint8_t *out, size_t max_out);
// SSL_SESSION_set_time sets |session|'s creation time to |time| and returns
// |time|. This function may be useful in writing tests but otherwise should not
// be used.
OPENSSL_EXPORT uint64_t SSL_SESSION_set_time(SSL_SESSION *session,
uint64_t time);
// SSL_SESSION_set_timeout sets |session|'s timeout to |timeout| and returns
// one. This function may be useful in writing tests but otherwise should not
// be used.
OPENSSL_EXPORT uint32_t SSL_SESSION_set_timeout(SSL_SESSION *session,
uint32_t timeout);
// SSL_SESSION_get0_id_context returns a pointer to a buffer containing
// |session|'s session ID context (see |SSL_CTX_set_session_id_context|) and
// sets |*out_len| to its length.
OPENSSL_EXPORT const uint8_t *SSL_SESSION_get0_id_context(
const SSL_SESSION *session, unsigned *out_len);
// SSL_SESSION_set1_id_context sets |session|'s session ID context (see
// |SSL_CTX_set_session_id_context|) to |sid_ctx|. It returns one on success and
// zero on error. This function may be useful in writing tests but otherwise
// should not be used.
OPENSSL_EXPORT int SSL_SESSION_set1_id_context(SSL_SESSION *session,
const uint8_t *sid_ctx,
size_t sid_ctx_len);
// SSL_SESSION_should_be_single_use returns one if |session| should be
// single-use (TLS 1.3 and later) and zero otherwise.
//
// If this function returns one, clients retain multiple sessions and use each
// only once. This prevents passive observers from correlating connections with
// tickets. See RFC 8446, appendix C.4. If it returns zero, |session| cannot be
// used without leaking a correlator.
OPENSSL_EXPORT int SSL_SESSION_should_be_single_use(const SSL_SESSION *session);
// SSL_SESSION_is_resumable returns one if |session| is resumable and zero
// otherwise.
OPENSSL_EXPORT int SSL_SESSION_is_resumable(const SSL_SESSION *session);
// SSL_SESSION_has_ticket returns one if |session| has a ticket and zero
// otherwise.
OPENSSL_EXPORT int SSL_SESSION_has_ticket(const SSL_SESSION *session);
// SSL_SESSION_get0_ticket sets |*out_ticket| and |*out_len| to |session|'s
// ticket, or NULL and zero if it does not have one. |out_ticket| may be NULL
// if only the ticket length is needed.
OPENSSL_EXPORT void SSL_SESSION_get0_ticket(const SSL_SESSION *session,
const uint8_t **out_ticket,
size_t *out_len);
// SSL_SESSION_set_ticket sets |session|'s ticket to |ticket|. It returns one on
// success and zero on error. This function may be useful in writing tests but
// otherwise should not be used.
OPENSSL_EXPORT int SSL_SESSION_set_ticket(SSL_SESSION *session,
const uint8_t *ticket,
size_t ticket_len);
// SSL_SESSION_get_ticket_lifetime_hint returns ticket lifetime hint of
// |session| in seconds or zero if none was set.
OPENSSL_EXPORT uint32_t
SSL_SESSION_get_ticket_lifetime_hint(const SSL_SESSION *session);
// SSL_SESSION_get0_cipher returns the cipher negotiated by the connection which
// established |session|.
//
// Note that, in TLS 1.3, there is no guarantee that resumptions with |session|
// will use that cipher. Prefer calling |SSL_get_current_cipher| on the |SSL|
// instead.
OPENSSL_EXPORT const SSL_CIPHER *SSL_SESSION_get0_cipher(
const SSL_SESSION *session);
// SSL_SESSION_has_peer_sha256 returns one if |session| has a SHA-256 hash of
// the peer's certificate retained and zero if the peer did not present a
// certificate or if this was not enabled when |session| was created. See also
// |SSL_CTX_set_retain_only_sha256_of_client_certs|.
OPENSSL_EXPORT int SSL_SESSION_has_peer_sha256(const SSL_SESSION *session);
// SSL_SESSION_get0_peer_sha256 sets |*out_ptr| and |*out_len| to the SHA-256
// hash of the peer certificate retained in |session|, or NULL and zero if it
// does not have one. See also |SSL_CTX_set_retain_only_sha256_of_client_certs|.
OPENSSL_EXPORT void SSL_SESSION_get0_peer_sha256(const SSL_SESSION *session,
const uint8_t **out_ptr,
size_t *out_len);
// Session caching.
//
// Session caching allows connections to be established more efficiently based
// on saved parameters from a previous connection, called a session (see
// |SSL_SESSION|). The client offers a saved session, using an opaque identifier
// from a previous connection. The server may accept the session, if it has the
// parameters available. Otherwise, it will decline and continue with a full
// handshake.
//
// This requires both the client and the server to retain session state. A
// client does so with a stateful session cache. A server may do the same or, if
// supported by both sides, statelessly using session tickets. For more
// information on the latter, see the next section.
//
// For a server, the library implements a built-in internal session cache as an
// in-memory hash table. Servers may also use |SSL_CTX_sess_set_get_cb| and
// |SSL_CTX_sess_set_new_cb| to implement a custom external session cache. In
// particular, this may be used to share a session cache between multiple
// servers in a large deployment. An external cache may be used in addition to
// or instead of the internal one. Use |SSL_CTX_set_session_cache_mode| to
// toggle the internal cache.
//
// For a client, the only option is an external session cache. Clients may use
// |SSL_CTX_sess_set_new_cb| to register a callback for when new sessions are
// available. These may be cached and, in subsequent compatible connections,
// configured with |SSL_set_session|.
//
// Note that offering or accepting a session short-circuits certificate
// verification and most parameter negotiation. Resuming sessions across
// different contexts may result in security failures and surprising
// behavior. For a typical client, this means sessions for different hosts must
// be cached under different keys. A client that connects to the same host with,
// e.g., different cipher suite settings or client certificates should also use
// separate session caches between those contexts. Servers should also partition
// session caches between SNI hosts with |SSL_CTX_set_session_id_context|.
//
// Note also, in TLS 1.2 and earlier, offering sessions allows passive observers
// to correlate different client connections. TLS 1.3 and later fix this,
// provided clients use sessions at most once. Session caches are managed by the
// caller in BoringSSL, so this must be implemented externally. See
// |SSL_SESSION_should_be_single_use| for details.
// SSL_SESS_CACHE_OFF disables all session caching.
#define SSL_SESS_CACHE_OFF 0x0000
// SSL_SESS_CACHE_CLIENT enables session caching for a client. The internal
// cache is never used on a client, so this only enables the callbacks.
#define SSL_SESS_CACHE_CLIENT 0x0001
// SSL_SESS_CACHE_SERVER enables session caching for a server.
#define SSL_SESS_CACHE_SERVER 0x0002
// SSL_SESS_CACHE_BOTH enables session caching for both client and server.
#define SSL_SESS_CACHE_BOTH (SSL_SESS_CACHE_CLIENT | SSL_SESS_CACHE_SERVER)
// SSL_SESS_CACHE_NO_AUTO_CLEAR disables automatically calling
// |SSL_CTX_flush_sessions| every 255 connections.
#define SSL_SESS_CACHE_NO_AUTO_CLEAR 0x0080
// SSL_SESS_CACHE_NO_INTERNAL_LOOKUP, on a server, disables looking up a session
// from the internal session cache.
#define SSL_SESS_CACHE_NO_INTERNAL_LOOKUP 0x0100
// SSL_SESS_CACHE_NO_INTERNAL_STORE, on a server, disables storing sessions in
// the internal session cache.
#define SSL_SESS_CACHE_NO_INTERNAL_STORE 0x0200
// SSL_SESS_CACHE_NO_INTERNAL, on a server, disables the internal session
// cache.
#define SSL_SESS_CACHE_NO_INTERNAL \
(SSL_SESS_CACHE_NO_INTERNAL_LOOKUP | SSL_SESS_CACHE_NO_INTERNAL_STORE)
// SSL_CTX_set_session_cache_mode sets the session cache mode bits for |ctx| to
// |mode|. It returns the previous value.
OPENSSL_EXPORT int SSL_CTX_set_session_cache_mode(SSL_CTX *ctx, int mode);
// SSL_CTX_get_session_cache_mode returns the session cache mode bits for
// |ctx|
OPENSSL_EXPORT int SSL_CTX_get_session_cache_mode(const SSL_CTX *ctx);
// SSL_set_session, for a client, configures |ssl| to offer to resume |session|
// in the initial handshake and returns one. The caller retains ownership of
// |session|. Note that configuring a session assumes the authentication in the
// session is valid. For callers that wish to revalidate the session before
// offering, see |SSL_SESSION_get0_peer_certificates|,
// |SSL_SESSION_get0_signed_cert_timestamp_list|, and
// |SSL_SESSION_get0_ocsp_response|.
//
// It is an error to call this function after the handshake has begun.
OPENSSL_EXPORT int SSL_set_session(SSL *ssl, SSL_SESSION *session);
// SSL_DEFAULT_SESSION_TIMEOUT is the default lifetime, in seconds, of a
// session in TLS 1.2 or earlier. This is how long we are willing to use the
// secret to encrypt traffic without fresh key material.
#define SSL_DEFAULT_SESSION_TIMEOUT (2 * 60 * 60)
// SSL_DEFAULT_SESSION_PSK_DHE_TIMEOUT is the default lifetime, in seconds, of a
// session for TLS 1.3 psk_dhe_ke. This is how long we are willing to use the
// secret as an authenticator.
#define SSL_DEFAULT_SESSION_PSK_DHE_TIMEOUT (2 * 24 * 60 * 60)
// SSL_DEFAULT_SESSION_AUTH_TIMEOUT is the default non-renewable lifetime, in
// seconds, of a TLS 1.3 session. This is how long we are willing to trust the
// signature in the initial handshake.
#define SSL_DEFAULT_SESSION_AUTH_TIMEOUT (7 * 24 * 60 * 60)
// SSL_CTX_set_timeout sets the lifetime, in seconds, of TLS 1.2 (or earlier)
// sessions created in |ctx| to |timeout|.
OPENSSL_EXPORT uint32_t SSL_CTX_set_timeout(SSL_CTX *ctx, uint32_t timeout);
// SSL_CTX_set_session_psk_dhe_timeout sets the lifetime, in seconds, of TLS 1.3
// sessions created in |ctx| to |timeout|.
OPENSSL_EXPORT void SSL_CTX_set_session_psk_dhe_timeout(SSL_CTX *ctx,
uint32_t timeout);
// SSL_CTX_get_timeout returns the lifetime, in seconds, of TLS 1.2 (or earlier)
// sessions created in |ctx|.
OPENSSL_EXPORT uint32_t SSL_CTX_get_timeout(const SSL_CTX *ctx);
// SSL_MAX_SID_CTX_LENGTH is the maximum length of a session ID context.
#define SSL_MAX_SID_CTX_LENGTH 32
// SSL_CTX_set_session_id_context sets |ctx|'s session ID context to |sid_ctx|.
// It returns one on success and zero on error. The session ID context is an
// application-defined opaque byte string. A session will not be used in a
// connection without a matching session ID context.
//
// For a server, if |SSL_VERIFY_PEER| is enabled, it is an error to not set a
// session ID context.
OPENSSL_EXPORT int SSL_CTX_set_session_id_context(SSL_CTX *ctx,
const uint8_t *sid_ctx,
size_t sid_ctx_len);
// SSL_set_session_id_context sets |ssl|'s session ID context to |sid_ctx|. It
// returns one on success and zero on error. See also
// |SSL_CTX_set_session_id_context|.
OPENSSL_EXPORT int SSL_set_session_id_context(SSL *ssl, const uint8_t *sid_ctx,
size_t sid_ctx_len);
// SSL_get0_session_id_context returns a pointer to |ssl|'s session ID context
// and sets |*out_len| to its length. It returns NULL on error.
OPENSSL_EXPORT const uint8_t *SSL_get0_session_id_context(const SSL *ssl,
size_t *out_len);
// SSL_SESSION_CACHE_MAX_SIZE_DEFAULT is the default maximum size of a session
// cache.
#define SSL_SESSION_CACHE_MAX_SIZE_DEFAULT (1024 * 20)
// SSL_CTX_sess_set_cache_size sets the maximum size of |ctx|'s internal session
// cache to |size|. It returns the previous value.
OPENSSL_EXPORT unsigned long SSL_CTX_sess_set_cache_size(SSL_CTX *ctx,
unsigned long size);
// SSL_CTX_sess_get_cache_size returns the maximum size of |ctx|'s internal
// session cache.
OPENSSL_EXPORT unsigned long SSL_CTX_sess_get_cache_size(const SSL_CTX *ctx);
// SSL_CTX_sess_number returns the number of sessions in |ctx|'s internal
// session cache.
OPENSSL_EXPORT size_t SSL_CTX_sess_number(const SSL_CTX *ctx);
// SSL_CTX_add_session inserts |session| into |ctx|'s internal session cache. It
// returns one on success and zero on error or if |session| is already in the
// cache. The caller retains its reference to |session|.
OPENSSL_EXPORT int SSL_CTX_add_session(SSL_CTX *ctx, SSL_SESSION *session);
// SSL_CTX_remove_session removes |session| from |ctx|'s internal session cache.
// It returns one on success and zero if |session| was not in the cache.
OPENSSL_EXPORT int SSL_CTX_remove_session(SSL_CTX *ctx, SSL_SESSION *session);
// SSL_CTX_flush_sessions removes all sessions from |ctx| which have expired as
// of time |time|. If |time| is zero, all sessions are removed.
OPENSSL_EXPORT void SSL_CTX_flush_sessions(SSL_CTX *ctx, uint64_t time);
// SSL_CTX_sess_set_new_cb sets the callback to be called when a new session is
// established and ready to be cached. If the session cache is disabled (the
// appropriate one of |SSL_SESS_CACHE_CLIENT| or |SSL_SESS_CACHE_SERVER| is
// unset), the callback is not called.
//
// The callback is passed a reference to |session|. It returns one if it takes
// ownership (and then calls |SSL_SESSION_free| when done) and zero otherwise. A
// consumer which places |session| into an in-memory cache will likely return
// one, with the cache calling |SSL_SESSION_free|. A consumer which serializes
// |session| with |SSL_SESSION_to_bytes| may not need to retain |session| and
// will likely return zero. Returning one is equivalent to calling
// |SSL_SESSION_up_ref| and then returning zero.
//
// Note: For a client, the callback may be called on abbreviated handshakes if a
// ticket is renewed. Further, it may not be called until some time after
// |SSL_do_handshake| or |SSL_connect| completes if False Start is enabled. Thus
// it's recommended to use this callback over calling |SSL_get_session| on
// handshake completion.
OPENSSL_EXPORT void SSL_CTX_sess_set_new_cb(
SSL_CTX *ctx, int (*new_session_cb)(SSL *ssl, SSL_SESSION *session));
// SSL_CTX_sess_get_new_cb returns the callback set by
// |SSL_CTX_sess_set_new_cb|.
OPENSSL_EXPORT int (*SSL_CTX_sess_get_new_cb(SSL_CTX *ctx))(
SSL *ssl, SSL_SESSION *session);
// SSL_CTX_sess_set_remove_cb sets a callback which is called when a session is
// removed from the internal session cache.
//
// TODO(davidben): What is the point of this callback? It seems useless since it
// only fires on sessions in the internal cache.
OPENSSL_EXPORT void SSL_CTX_sess_set_remove_cb(
SSL_CTX *ctx,
void (*remove_session_cb)(SSL_CTX *ctx, SSL_SESSION *session));
// SSL_CTX_sess_get_remove_cb returns the callback set by
// |SSL_CTX_sess_set_remove_cb|.
OPENSSL_EXPORT void (*SSL_CTX_sess_get_remove_cb(SSL_CTX *ctx))(
SSL_CTX *ctx, SSL_SESSION *session);
// SSL_CTX_sess_set_get_cb sets a callback to look up a session by ID for a
// server. The callback is passed the session ID and should return a matching
// |SSL_SESSION| or NULL if not found. It should set |*out_copy| to zero and
// return a new reference to the session. This callback is not used for a
// client.
//
// For historical reasons, if |*out_copy| is set to one (default), the SSL
// library will take a new reference to the returned |SSL_SESSION|, expecting
// the callback to return a non-owning pointer. This is not recommended. If
// |ctx| and thus the callback is used on multiple threads, the session may be
// removed and invalidated before the SSL library calls |SSL_SESSION_up_ref|,
// whereas the callback may synchronize internally.
//
// To look up a session asynchronously, the callback may return
// |SSL_magic_pending_session_ptr|. See the documentation for that function and
// |SSL_ERROR_PENDING_SESSION|.
//
// If the internal session cache is enabled, the callback is only consulted if
// the internal cache does not return a match.
OPENSSL_EXPORT void SSL_CTX_sess_set_get_cb(
SSL_CTX *ctx, SSL_SESSION *(*get_session_cb)(SSL *ssl, const uint8_t *id,
int id_len, int *out_copy));
// SSL_CTX_sess_get_get_cb returns the callback set by
// |SSL_CTX_sess_set_get_cb|.
OPENSSL_EXPORT SSL_SESSION *(*SSL_CTX_sess_get_get_cb(SSL_CTX *ctx))(
SSL *ssl, const uint8_t *id, int id_len, int *out_copy);
// SSL_magic_pending_session_ptr returns a magic |SSL_SESSION|* which indicates
// that the session isn't currently unavailable. |SSL_get_error| will then
// return |SSL_ERROR_PENDING_SESSION| and the handshake can be retried later
// when the lookup has completed.
OPENSSL_EXPORT SSL_SESSION *SSL_magic_pending_session_ptr(void);
// Session tickets.
//
// Session tickets, from RFC 5077, allow session resumption without server-side
// state. The server maintains a secret ticket key and sends the client opaque
// encrypted session parameters, called a ticket. When offering the session, the
// client sends the ticket which the server decrypts to recover session state.
// Session tickets are enabled by default but may be disabled with
// |SSL_OP_NO_TICKET|.
//
// On the client, ticket-based sessions use the same APIs as ID-based tickets.
// Callers do not need to handle them differently.
//
// On the server, tickets are encrypted and authenticated with a secret key. By
// default, an |SSL_CTX| generates a key on creation and uses it for the
// lifetime of the |SSL_CTX|. Tickets are minted and processed
// transparently. The following functions may be used to configure a persistent
// key or implement more custom behavior, including key rotation and sharing
// keys between multiple servers in a large deployment. There are three levels
// of customisation possible:
//
// 1) One can simply set the keys with |SSL_CTX_set_tlsext_ticket_keys|.
// 2) One can configure an |EVP_CIPHER_CTX| and |HMAC_CTX| directly for
// encryption and authentication.
// 3) One can configure an |SSL_TICKET_AEAD_METHOD| to have more control
// and the option of asynchronous decryption.
//
// An attacker that compromises a server's session ticket key can impersonate
// the server and, prior to TLS 1.3, retroactively decrypt all application
// traffic from sessions using that ticket key. Thus ticket keys must be
// regularly rotated for forward secrecy. Note the default key is rotated
// automatically once every 48 hours but manually configured keys are not.
// SSL_DEFAULT_TICKET_KEY_ROTATION_INTERVAL is the interval with which the
// default session ticket encryption key is rotated, if in use. If any
// non-default ticket encryption mechanism is configured, automatic rotation is
// disabled.
#define SSL_DEFAULT_TICKET_KEY_ROTATION_INTERVAL (2 * 24 * 60 * 60)
// SSL_CTX_get_tlsext_ticket_keys writes |ctx|'s session ticket key material to
// |len| bytes of |out|. It returns one on success and zero if |len| is not
// 48. If |out| is NULL, it returns 48 instead.
OPENSSL_EXPORT int SSL_CTX_get_tlsext_ticket_keys(SSL_CTX *ctx, void *out,
size_t len);
// SSL_CTX_set_tlsext_ticket_keys sets |ctx|'s session ticket key material to
// |len| bytes of |in|. It returns one on success and zero if |len| is not
// 48. If |in| is NULL, it returns 48 instead.
OPENSSL_EXPORT int SSL_CTX_set_tlsext_ticket_keys(SSL_CTX *ctx, const void *in,
size_t len);
// SSL_TICKET_KEY_NAME_LEN is the length of the key name prefix of a session
// ticket.
#define SSL_TICKET_KEY_NAME_LEN 16
// SSL_CTX_set_tlsext_ticket_key_cb sets the ticket callback to |callback| and
// returns one. |callback| will be called when encrypting a new ticket and when
// decrypting a ticket from the client.
//
// In both modes, |ctx| and |hmac_ctx| will already have been initialized with
// |EVP_CIPHER_CTX_init| and |HMAC_CTX_init|, respectively. |callback|
// configures |hmac_ctx| with an HMAC digest and key, and configures |ctx|
// for encryption or decryption, based on the mode.
//
// When encrypting a new ticket, |encrypt| will be one. It writes a public
// 16-byte key name to |key_name| and a fresh IV to |iv|. The output IV length
// must match |EVP_CIPHER_CTX_iv_length| of the cipher selected. In this mode,
// |callback| returns 1 on success and -1 on error.
//
// When decrypting a ticket, |encrypt| will be zero. |key_name| will point to a
// 16-byte key name and |iv| points to an IV. The length of the IV consumed must
// match |EVP_CIPHER_CTX_iv_length| of the cipher selected. In this mode,
// |callback| returns -1 to abort the handshake, 0 if decrypting the ticket
// failed, and 1 or 2 on success. If it returns 2, the ticket will be renewed.
// This may be used to re-key the ticket.
//
// WARNING: |callback| wildly breaks the usual return value convention and is
// called in two different modes.
OPENSSL_EXPORT int SSL_CTX_set_tlsext_ticket_key_cb(
SSL_CTX *ctx, int (*callback)(SSL *ssl, uint8_t *key_name, uint8_t *iv,
EVP_CIPHER_CTX *ctx, HMAC_CTX *hmac_ctx,
int encrypt));
// ssl_ticket_aead_result_t enumerates the possible results from decrypting a
// ticket with an |SSL_TICKET_AEAD_METHOD|.
enum ssl_ticket_aead_result_t {
// ssl_ticket_aead_success indicates that the ticket was successfully
// decrypted.
ssl_ticket_aead_success,
// ssl_ticket_aead_retry indicates that the operation could not be
// immediately completed and must be reattempted, via |open|, at a later
// point.
ssl_ticket_aead_retry,
// ssl_ticket_aead_ignore_ticket indicates that the ticket should be ignored
// (i.e. is corrupt or otherwise undecryptable).
ssl_ticket_aead_ignore_ticket,
// ssl_ticket_aead_error indicates that a fatal error occured and the
// handshake should be terminated.
ssl_ticket_aead_error,
};
// ssl_ticket_aead_method_st (aka |SSL_TICKET_AEAD_METHOD|) contains methods
// for encrypting and decrypting session tickets.
struct ssl_ticket_aead_method_st {
// max_overhead returns the maximum number of bytes of overhead that |seal|
// may add.
size_t (*max_overhead)(SSL *ssl);
// seal encrypts and authenticates |in_len| bytes from |in|, writes, at most,
// |max_out_len| bytes to |out|, and puts the number of bytes written in
// |*out_len|. The |in| and |out| buffers may be equal but will not otherwise
// alias. It returns one on success or zero on error.
int (*seal)(SSL *ssl, uint8_t *out, size_t *out_len, size_t max_out_len,
const uint8_t *in, size_t in_len);
// open authenticates and decrypts |in_len| bytes from |in|, writes, at most,
// |max_out_len| bytes of plaintext to |out|, and puts the number of bytes
// written in |*out_len|. The |in| and |out| buffers may be equal but will
// not otherwise alias. See |ssl_ticket_aead_result_t| for details of the
// return values. In the case that a retry is indicated, the caller should
// arrange for the high-level operation on |ssl| to be retried when the
// operation is completed, which will result in another call to |open|.
enum ssl_ticket_aead_result_t (*open)(SSL *ssl, uint8_t *out, size_t *out_len,
size_t max_out_len, const uint8_t *in,
size_t in_len);
};
// SSL_CTX_set_ticket_aead_method configures a custom ticket AEAD method table
// on |ctx|. |aead_method| must remain valid for the lifetime of |ctx|.
OPENSSL_EXPORT void SSL_CTX_set_ticket_aead_method(
SSL_CTX *ctx, const SSL_TICKET_AEAD_METHOD *aead_method);
// Elliptic curve Diffie-Hellman.
//
// Cipher suites using an ECDHE key exchange perform Diffie-Hellman over an
// elliptic curve negotiated by both endpoints. See RFC 4492. Only named curves
// are supported. ECDHE is always enabled, but the curve preferences may be
// configured with these functions.
//
// Note that TLS 1.3 renames these from curves to groups. For consistency, we
// currently use the TLS 1.2 name in the API.
// SSL_CTX_set1_curves sets the preferred curves for |ctx| to be |curves|. Each
// element of |curves| should be a curve nid. It returns one on success and
// zero on failure.
//
// Note that this API uses nid values from nid.h and not the |SSL_CURVE_*|
// values defined below.
OPENSSL_EXPORT int SSL_CTX_set1_curves(SSL_CTX *ctx, const int *curves,
size_t curves_len);
// SSL_set1_curves sets the preferred curves for |ssl| to be |curves|. Each
// element of |curves| should be a curve nid. It returns one on success and
// zero on failure.
//
// Note that this API uses nid values from nid.h and not the |SSL_CURVE_*|
// values defined below.
OPENSSL_EXPORT int SSL_set1_curves(SSL *ssl, const int *curves,
size_t curves_len);
// SSL_CTX_set1_curves_list sets the preferred curves for |ctx| to be the
// colon-separated list |curves|. Each element of |curves| should be a curve
// name (e.g. P-256, X25519, ...). It returns one on success and zero on
// failure.
OPENSSL_EXPORT int SSL_CTX_set1_curves_list(SSL_CTX *ctx, const char *curves);
// SSL_set1_curves_list sets the preferred curves for |ssl| to be the
// colon-separated list |curves|. Each element of |curves| should be a curve
// name (e.g. P-256, X25519, ...). It returns one on success and zero on
// failure.
OPENSSL_EXPORT int SSL_set1_curves_list(SSL *ssl, const char *curves);
// SSL_CURVE_* define TLS curve IDs.
#define SSL_CURVE_SECP224R1 21
#define SSL_CURVE_SECP256R1 23
#define SSL_CURVE_SECP384R1 24
#define SSL_CURVE_SECP521R1 25
#define SSL_CURVE_X25519 29
// SSL_get_curve_id returns the ID of the curve used by |ssl|'s most recently
// completed handshake or 0 if not applicable.
//
// TODO(davidben): This API currently does not work correctly if there is a
// renegotiation in progress. Fix this.
OPENSSL_EXPORT uint16_t SSL_get_curve_id(const SSL *ssl);
// SSL_get_curve_name returns a human-readable name for the curve specified by
// the given TLS curve id, or NULL if the curve is unknown.
OPENSSL_EXPORT const char *SSL_get_curve_name(uint16_t curve_id);
// Certificate verification.
//
// SSL may authenticate either endpoint with an X.509 certificate. Typically
// this is used to authenticate the server to the client. These functions
// configure certificate verification.
//
// WARNING: By default, certificate verification errors on a client are not
// fatal. See |SSL_VERIFY_NONE| This may be configured with
// |SSL_CTX_set_verify|.
//
// By default clients are anonymous but a server may request a certificate from
// the client by setting |SSL_VERIFY_PEER|.
//
// Many of these functions use OpenSSL's legacy X.509 stack which is
// underdocumented and deprecated, but the replacement isn't ready yet. For
// now, consumers may use the existing stack or bypass it by performing
// certificate verification externally. This may be done with
// |SSL_CTX_set_cert_verify_callback| or by extracting the chain with
// |SSL_get_peer_cert_chain| after the handshake. In the future, functions will
// be added to use the SSL stack without dependency on any part of the legacy
// X.509 and ASN.1 stack.
//
// To augment certificate verification, a client may also enable OCSP stapling
// (RFC 6066) and Certificate Transparency (RFC 6962) extensions.
// SSL_VERIFY_NONE, on a client, verifies the server certificate but does not
// make errors fatal. The result may be checked with |SSL_get_verify_result|. On
// a server it does not request a client certificate. This is the default.
#define SSL_VERIFY_NONE 0x00
// SSL_VERIFY_PEER, on a client, makes server certificate errors fatal. On a
// server it requests a client certificate and makes errors fatal. However,
// anonymous clients are still allowed. See
// |SSL_VERIFY_FAIL_IF_NO_PEER_CERT|.
#define SSL_VERIFY_PEER 0x01
// SSL_VERIFY_FAIL_IF_NO_PEER_CERT configures a server to reject connections if
// the client declines to send a certificate. This flag must be used together
// with |SSL_VERIFY_PEER|, otherwise it won't work.
#define SSL_VERIFY_FAIL_IF_NO_PEER_CERT 0x02
// SSL_VERIFY_PEER_IF_NO_OBC configures a server to request a client certificate
// if and only if Channel ID is not negotiated.
#define SSL_VERIFY_PEER_IF_NO_OBC 0x04
// SSL_CTX_set_verify configures certificate verification behavior. |mode| is
// one of the |SSL_VERIFY_*| values defined above. |callback|, if not NULL, is
// used to customize certificate verification. See the behavior of
// |X509_STORE_CTX_set_verify_cb|.
//
// The callback may use |SSL_get_ex_data_X509_STORE_CTX_idx| with
// |X509_STORE_CTX_get_ex_data| to look up the |SSL| from |store_ctx|.
OPENSSL_EXPORT void SSL_CTX_set_verify(
SSL_CTX *ctx, int mode, int (*callback)(int ok, X509_STORE_CTX *store_ctx));
// SSL_set_verify configures certificate verification behavior. |mode| is one of
// the |SSL_VERIFY_*| values defined above. |callback|, if not NULL, is used to
// customize certificate verification. See the behavior of
// |X509_STORE_CTX_set_verify_cb|.
//
// The callback may use |SSL_get_ex_data_X509_STORE_CTX_idx| with
// |X509_STORE_CTX_get_ex_data| to look up the |SSL| from |store_ctx|.
OPENSSL_EXPORT void SSL_set_verify(SSL *ssl, int mode,
int (*callback)(int ok,
X509_STORE_CTX *store_ctx));
enum ssl_verify_result_t {
ssl_verify_ok,
ssl_verify_invalid,
ssl_verify_retry,
};
// SSL_CTX_set_custom_verify configures certificate verification. |mode| is one
// of the |SSL_VERIFY_*| values defined above. |callback| performs the
// certificate verification.
//
// The callback may call |SSL_get0_peer_certificates| for the certificate chain
// to validate. The callback should return |ssl_verify_ok| if the certificate is
// valid. If the certificate is invalid, the callback should return
// |ssl_verify_invalid| and optionally set |*out_alert| to an alert to send to
// the peer. Some useful alerts include |SSL_AD_CERTIFICATE_EXPIRED|,
// |SSL_AD_CERTIFICATE_REVOKED|, |SSL_AD_UNKNOWN_CA|, |SSL_AD_BAD_CERTIFICATE|,
// |SSL_AD_CERTIFICATE_UNKNOWN|, and |SSL_AD_INTERNAL_ERROR|. See RFC 5246
// section 7.2.2 for their precise meanings. If unspecified,
// |SSL_AD_CERTIFICATE_UNKNOWN| will be sent by default.
//
// To verify a certificate asynchronously, the callback may return
// |ssl_verify_retry|. The handshake will then pause with |SSL_get_error|
// returning |SSL_ERROR_WANT_CERTIFICATE_VERIFY|.
OPENSSL_EXPORT void SSL_CTX_set_custom_verify(
SSL_CTX *ctx, int mode,
enum ssl_verify_result_t (*callback)(SSL *ssl, uint8_t *out_alert));
// SSL_set_custom_verify behaves like |SSL_CTX_set_custom_verify| but configures
// an individual |SSL|.
OPENSSL_EXPORT void SSL_set_custom_verify(
SSL *ssl, int mode,
enum ssl_verify_result_t (*callback)(SSL *ssl, uint8_t *out_alert));
// SSL_CTX_get_verify_mode returns |ctx|'s verify mode, set by
// |SSL_CTX_set_verify|.
OPENSSL_EXPORT int SSL_CTX_get_verify_mode(const SSL_CTX *ctx);
// SSL_get_verify_mode returns |ssl|'s verify mode, set by |SSL_CTX_set_verify|
// or |SSL_set_verify|. It returns -1 on error.
OPENSSL_EXPORT int SSL_get_verify_mode(const SSL *ssl);
// SSL_CTX_get_verify_callback returns the callback set by
// |SSL_CTX_set_verify|.
OPENSSL_EXPORT int (*SSL_CTX_get_verify_callback(const SSL_CTX *ctx))(
int ok, X509_STORE_CTX *store_ctx);
// SSL_get_verify_callback returns the callback set by |SSL_CTX_set_verify| or
// |SSL_set_verify|.
OPENSSL_EXPORT int (*SSL_get_verify_callback(const SSL *ssl))(
int ok, X509_STORE_CTX *store_ctx);
// SSL_CTX_set_verify_depth sets the maximum depth of a certificate chain
// accepted in verification. This number does not include the leaf, so a depth
// of 1 allows the leaf and one CA certificate.
OPENSSL_EXPORT void SSL_CTX_set_verify_depth(SSL_CTX *ctx, int depth);
// SSL_set_verify_depth sets the maximum depth of a certificate chain accepted
// in verification. This number does not include the leaf, so a depth of 1
// allows the leaf and one CA certificate.
OPENSSL_EXPORT void SSL_set_verify_depth(SSL *ssl, int depth);
// SSL_CTX_get_verify_depth returns the maximum depth of a certificate accepted
// in verification.
OPENSSL_EXPORT int SSL_CTX_get_verify_depth(const SSL_CTX *ctx);
// SSL_get_verify_depth returns the maximum depth of a certificate accepted in
// verification.
OPENSSL_EXPORT int SSL_get_verify_depth(const SSL *ssl);
// SSL_CTX_set1_param sets verification parameters from |param|. It returns one
// on success and zero on failure. The caller retains ownership of |param|.
OPENSSL_EXPORT int SSL_CTX_set1_param(SSL_CTX *ctx,
const X509_VERIFY_PARAM *param);
// SSL_set1_param sets verification parameters from |param|. It returns one on
// success and zero on failure. The caller retains ownership of |param|.
OPENSSL_EXPORT int SSL_set1_param(SSL *ssl,
const X509_VERIFY_PARAM *param);
// SSL_CTX_get0_param returns |ctx|'s |X509_VERIFY_PARAM| for certificate
// verification. The caller must not release the returned pointer but may call
// functions on it to configure it.
OPENSSL_EXPORT X509_VERIFY_PARAM *SSL_CTX_get0_param(SSL_CTX *ctx);
// SSL_get0_param returns |ssl|'s |X509_VERIFY_PARAM| for certificate
// verification. The caller must not release the returned pointer but may call
// functions on it to configure it.
OPENSSL_EXPORT X509_VERIFY_PARAM *SSL_get0_param(SSL *ssl);
// SSL_CTX_set_purpose sets |ctx|'s |X509_VERIFY_PARAM|'s 'purpose' parameter to
// |purpose|. It returns one on success and zero on error.
OPENSSL_EXPORT int SSL_CTX_set_purpose(SSL_CTX *ctx, int purpose);
// SSL_set_purpose sets |ssl|'s |X509_VERIFY_PARAM|'s 'purpose' parameter to
// |purpose|. It returns one on success and zero on error.
OPENSSL_EXPORT int SSL_set_purpose(SSL *ssl, int purpose);
// SSL_CTX_set_trust sets |ctx|'s |X509_VERIFY_PARAM|'s 'trust' parameter to
// |trust|. It returns one on success and zero on error.
OPENSSL_EXPORT int SSL_CTX_set_trust(SSL_CTX *ctx, int trust);
// SSL_set_trust sets |ssl|'s |X509_VERIFY_PARAM|'s 'trust' parameter to
// |trust|. It returns one on success and zero on error.
OPENSSL_EXPORT int SSL_set_trust(SSL *ssl, int trust);
// SSL_CTX_set_cert_store sets |ctx|'s certificate store to |store|. It takes
// ownership of |store|. The store is used for certificate verification.
//
// The store is also used for the auto-chaining feature, but this is deprecated.
// See also |SSL_MODE_NO_AUTO_CHAIN|.
OPENSSL_EXPORT void SSL_CTX_set_cert_store(SSL_CTX *ctx, X509_STORE *store);
// SSL_CTX_get_cert_store returns |ctx|'s certificate store.
OPENSSL_EXPORT X509_STORE *SSL_CTX_get_cert_store(const SSL_CTX *ctx);
// SSL_CTX_set_default_verify_paths loads the OpenSSL system-default trust
// anchors into |ctx|'s store. It returns one on success and zero on failure.
OPENSSL_EXPORT int SSL_CTX_set_default_verify_paths(SSL_CTX *ctx);
// SSL_CTX_load_verify_locations loads trust anchors into |ctx|'s store from
// |ca_file| and |ca_dir|, either of which may be NULL. If |ca_file| is passed,
// it is opened and PEM-encoded CA certificates are read. If |ca_dir| is passed,
// it is treated as a directory in OpenSSL's hashed directory format. It returns
// one on success and zero on failure.
//
// See
// https://www.openssl.org/docs/manmaster/ssl/SSL_CTX_load_verify_locations.html
// for documentation on the directory format.
OPENSSL_EXPORT int SSL_CTX_load_verify_locations(SSL_CTX *ctx,
const char *ca_file,
const char *ca_dir);
// SSL_get_verify_result returns the result of certificate verification. It is
// either |X509_V_OK| or a |X509_V_ERR_*| value.
OPENSSL_EXPORT long SSL_get_verify_result(const SSL *ssl);
// SSL_alert_from_verify_result returns the SSL alert code, such as
// |SSL_AD_CERTIFICATE_EXPIRED|, that corresponds to an |X509_V_ERR_*| value.
// The return value is always an alert, even when |result| is |X509_V_OK|.
OPENSSL_EXPORT int SSL_alert_from_verify_result(long result);
// SSL_get_ex_data_X509_STORE_CTX_idx returns the ex_data index used to look up
// the |SSL| associated with an |X509_STORE_CTX| in the verify callback.
OPENSSL_EXPORT int SSL_get_ex_data_X509_STORE_CTX_idx(void);
// SSL_CTX_set_cert_verify_callback sets a custom callback to be called on
// certificate verification rather than |X509_verify_cert|. |store_ctx| contains
// the verification parameters. The callback should return one on success and
// zero on fatal error. It may use |X509_STORE_CTX_set_error| to set a
// verification result.
//
// The callback may use |SSL_get_ex_data_X509_STORE_CTX_idx| to recover the
// |SSL| object from |store_ctx|.
OPENSSL_EXPORT void SSL_CTX_set_cert_verify_callback(
SSL_CTX *ctx, int (*callback)(X509_STORE_CTX *store_ctx, void *arg),
void *arg);
// SSL_enable_signed_cert_timestamps causes |ssl| (which must be the client end
// of a connection) to request SCTs from the server. See
// https://tools.ietf.org/html/rfc6962.
//
// Call |SSL_get0_signed_cert_timestamp_list| to recover the SCT after the
// handshake.
OPENSSL_EXPORT void SSL_enable_signed_cert_timestamps(SSL *ssl);
// SSL_CTX_enable_signed_cert_timestamps enables SCT requests on all client SSL
// objects created from |ctx|.
//
// Call |SSL_get0_signed_cert_timestamp_list| to recover the SCT after the
// handshake.
OPENSSL_EXPORT void SSL_CTX_enable_signed_cert_timestamps(SSL_CTX *ctx);
// SSL_enable_ocsp_stapling causes |ssl| (which must be the client end of a
// connection) to request a stapled OCSP response from the server.
//
// Call |SSL_get0_ocsp_response| to recover the OCSP response after the
// handshake.
OPENSSL_EXPORT void SSL_enable_ocsp_stapling(SSL *ssl);
// SSL_CTX_enable_ocsp_stapling enables OCSP stapling on all client SSL objects
// created from |ctx|.
//
// Call |SSL_get0_ocsp_response| to recover the OCSP response after the
// handshake.
OPENSSL_EXPORT void SSL_CTX_enable_ocsp_stapling(SSL_CTX *ctx);
// SSL_CTX_set0_verify_cert_store sets an |X509_STORE| that will be used
// exclusively for certificate verification and returns one. Ownership of
// |store| is transferred to the |SSL_CTX|.
OPENSSL_EXPORT int SSL_CTX_set0_verify_cert_store(SSL_CTX *ctx,
X509_STORE *store);
// SSL_CTX_set1_verify_cert_store sets an |X509_STORE| that will be used
// exclusively for certificate verification and returns one. An additional
// reference to |store| will be taken.
OPENSSL_EXPORT int SSL_CTX_set1_verify_cert_store(SSL_CTX *ctx,
X509_STORE *store);
// SSL_set0_verify_cert_store sets an |X509_STORE| that will be used
// exclusively for certificate verification and returns one. Ownership of
// |store| is transferred to the |SSL|.
OPENSSL_EXPORT int SSL_set0_verify_cert_store(SSL *ssl, X509_STORE *store);
// SSL_set1_verify_cert_store sets an |X509_STORE| that will be used
// exclusively for certificate verification and returns one. An additional
// reference to |store| will be taken.
OPENSSL_EXPORT int SSL_set1_verify_cert_store(SSL *ssl, X509_STORE *store);
// SSL_CTX_set_ed25519_enabled configures whether |ctx| advertises support for
// the Ed25519 signature algorithm when using the default preference list. It is
// disabled by default and may be enabled if the certificate verifier supports
// Ed25519.
OPENSSL_EXPORT void SSL_CTX_set_ed25519_enabled(SSL_CTX *ctx, int enabled);
// SSL_CTX_set_rsa_pss_rsae_certs_enabled configures whether |ctx| advertises
// support for rsa_pss_rsae_* signatures within the certificate chain. It is
// enabled by default but should be disabled if using a custom certificate
// verifier which does not support RSA-PSS signatures.
OPENSSL_EXPORT void SSL_CTX_set_rsa_pss_rsae_certs_enabled(SSL_CTX *ctx,
int enabled);
// SSL_CTX_set_verify_algorithm_prefs configures |ctx| to use |prefs| as the
// preference list when verifying signature's from the peer's long-term key. It
// returns one on zero on error. |prefs| should not include the internal-only
// value |SSL_SIGN_RSA_PKCS1_MD5_SHA1|.
OPENSSL_EXPORT int SSL_CTX_set_verify_algorithm_prefs(SSL_CTX *ctx,
const uint16_t *prefs,
size_t num_prefs);
// Client certificate CA list.
//
// When requesting a client certificate, a server may advertise a list of
// certificate authorities which are accepted. These functions may be used to
// configure this list.
// SSL_set_client_CA_list sets |ssl|'s client certificate CA list to
// |name_list|. It takes ownership of |name_list|.
OPENSSL_EXPORT void SSL_set_client_CA_list(SSL *ssl,
STACK_OF(X509_NAME) *name_list);
// SSL_CTX_set_client_CA_list sets |ctx|'s client certificate CA list to
// |name_list|. It takes ownership of |name_list|.
OPENSSL_EXPORT void SSL_CTX_set_client_CA_list(SSL_CTX *ctx,
STACK_OF(X509_NAME) *name_list);
// SSL_set0_client_CAs sets |ssl|'s client certificate CA list to |name_list|,
// which should contain DER-encoded distinguished names (RFC 5280). It takes
// ownership of |name_list|.
OPENSSL_EXPORT void SSL_set0_client_CAs(SSL *ssl,
STACK_OF(CRYPTO_BUFFER) *name_list);
// SSL_CTX_set0_client_CAs sets |ctx|'s client certificate CA list to
// |name_list|, which should contain DER-encoded distinguished names (RFC 5280).
// It takes ownership of |name_list|.
OPENSSL_EXPORT void SSL_CTX_set0_client_CAs(SSL_CTX *ctx,
STACK_OF(CRYPTO_BUFFER) *name_list);
// SSL_get_client_CA_list returns |ssl|'s client certificate CA list. If |ssl|
// has not been configured as a client, this is the list configured by
// |SSL_CTX_set_client_CA_list|.
//
// If configured as a client, it returns the client certificate CA list sent by
// the server. In this mode, the behavior is undefined except during the
// callbacks set by |SSL_CTX_set_cert_cb| and |SSL_CTX_set_client_cert_cb| or
// when the handshake is paused because of them.
OPENSSL_EXPORT STACK_OF(X509_NAME) *SSL_get_client_CA_list(const SSL *ssl);
// SSL_get0_server_requested_CAs returns the CAs sent by a server to guide a
// client in certificate selection. They are a series of DER-encoded X.509
// names. This function may only be called during a callback set by
// |SSL_CTX_set_cert_cb| or when the handshake is paused because of it.
//
// The returned stack is owned by |ssl|, as are its contents. It should not be
// used past the point where the handshake is restarted after the callback.
OPENSSL_EXPORT const STACK_OF(CRYPTO_BUFFER) *
SSL_get0_server_requested_CAs(const SSL *ssl);
// SSL_CTX_get_client_CA_list returns |ctx|'s client certificate CA list.
OPENSSL_EXPORT STACK_OF(X509_NAME) *
SSL_CTX_get_client_CA_list(const SSL_CTX *ctx);
// SSL_add_client_CA appends |x509|'s subject to the client certificate CA list.
// It returns one on success or zero on error. The caller retains ownership of
// |x509|.
OPENSSL_EXPORT int SSL_add_client_CA(SSL *ssl, X509 *x509);
// SSL_CTX_add_client_CA appends |x509|'s subject to the client certificate CA
// list. It returns one on success or zero on error. The caller retains
// ownership of |x509|.
OPENSSL_EXPORT int SSL_CTX_add_client_CA(SSL_CTX *ctx, X509 *x509);
// SSL_load_client_CA_file opens |file| and reads PEM-encoded certificates from
// it. It returns a newly-allocated stack of the certificate subjects or NULL
// on error.
OPENSSL_EXPORT STACK_OF(X509_NAME) *SSL_load_client_CA_file(const char *file);
// SSL_dup_CA_list makes a deep copy of |list|. It returns the new list on
// success or NULL on allocation error.
OPENSSL_EXPORT STACK_OF(X509_NAME) *SSL_dup_CA_list(STACK_OF(X509_NAME) *list);
// SSL_add_file_cert_subjects_to_stack behaves like |SSL_load_client_CA_file|
// but appends the result to |out|. It returns one on success or zero on
// error.
OPENSSL_EXPORT int SSL_add_file_cert_subjects_to_stack(STACK_OF(X509_NAME) *out,
const char *file);
// Server name indication.
//
// The server_name extension (RFC 3546) allows the client to advertise the name
// of the server it is connecting to. This is used in virtual hosting
// deployments to select one of a several certificates on a single IP. Only the
// host_name name type is supported.
#define TLSEXT_NAMETYPE_host_name 0
// SSL_set_tlsext_host_name, for a client, configures |ssl| to advertise |name|
// in the server_name extension. It returns one on success and zero on error.
OPENSSL_EXPORT int SSL_set_tlsext_host_name(SSL *ssl, const char *name);
// SSL_get_servername, for a server, returns the hostname supplied by the
// client or NULL if there was none. The |type| argument must be
// |TLSEXT_NAMETYPE_host_name|.
OPENSSL_EXPORT const char *SSL_get_servername(const SSL *ssl, const int type);
// SSL_get_servername_type, for a server, returns |TLSEXT_NAMETYPE_host_name|
// if the client sent a hostname and -1 otherwise.
OPENSSL_EXPORT int SSL_get_servername_type(const SSL *ssl);
// SSL_CTX_set_tlsext_servername_callback configures |callback| to be called on
// the server after ClientHello extensions have been parsed and returns one.
// The callback may use |SSL_get_servername| to examine the server_name
// extension and returns a |SSL_TLSEXT_ERR_*| value. The value of |arg| may be
// set by calling |SSL_CTX_set_tlsext_servername_arg|.
//
// If the callback returns |SSL_TLSEXT_ERR_NOACK|, the server_name extension is
// not acknowledged in the ServerHello. If the return value is
// |SSL_TLSEXT_ERR_ALERT_FATAL|, then |*out_alert| is the alert to send,
// defaulting to |SSL_AD_UNRECOGNIZED_NAME|. |SSL_TLSEXT_ERR_ALERT_WARNING| is
// ignored and treated as |SSL_TLSEXT_ERR_OK|.
OPENSSL_EXPORT int SSL_CTX_set_tlsext_servername_callback(
SSL_CTX *ctx, int (*callback)(SSL *ssl, int *out_alert, void *arg));
// SSL_CTX_set_tlsext_servername_arg sets the argument to the servername
// callback and returns one. See |SSL_CTX_set_tlsext_servername_callback|.
OPENSSL_EXPORT int SSL_CTX_set_tlsext_servername_arg(SSL_CTX *ctx, void *arg);
// SSL_TLSEXT_ERR_* are values returned by some extension-related callbacks.
#define SSL_TLSEXT_ERR_OK 0
#define SSL_TLSEXT_ERR_ALERT_WARNING 1
#define SSL_TLSEXT_ERR_ALERT_FATAL 2
#define SSL_TLSEXT_ERR_NOACK 3
// SSL_set_SSL_CTX changes |ssl|'s |SSL_CTX|. |ssl| will use the
// certificate-related settings from |ctx|, and |SSL_get_SSL_CTX| will report
// |ctx|. This function may be used during the callbacks registered by
// |SSL_CTX_set_select_certificate_cb|,
// |SSL_CTX_set_tlsext_servername_callback|, and |SSL_CTX_set_cert_cb| or when
// the handshake is paused from them. It is typically used to switch
// certificates based on SNI.
//
// Note the session cache and related settings will continue to use the initial
// |SSL_CTX|. Callers should use |SSL_CTX_set_session_id_context| to partition
// the session cache between different domains.
//
// TODO(davidben): Should other settings change after this call?
OPENSSL_EXPORT SSL_CTX *SSL_set_SSL_CTX(SSL *ssl, SSL_CTX *ctx);
// Application-layer protocol negotiation.
//
// The ALPN extension (RFC 7301) allows negotiating different application-layer
// protocols over a single port. This is used, for example, to negotiate
// HTTP/2.
// SSL_CTX_set_alpn_protos sets the client ALPN protocol list on |ctx| to
// |protos|. |protos| must be in wire-format (i.e. a series of non-empty, 8-bit
// length-prefixed strings). It returns zero on success and one on failure.
// Configuring this list enables ALPN on a client.
//
// WARNING: this function is dangerous because it breaks the usual return value
// convention.
OPENSSL_EXPORT int SSL_CTX_set_alpn_protos(SSL_CTX *ctx, const uint8_t *protos,
unsigned protos_len);
// SSL_set_alpn_protos sets the client ALPN protocol list on |ssl| to |protos|.
// |protos| must be in wire-format (i.e. a series of non-empty, 8-bit
// length-prefixed strings). It returns zero on success and one on failure.
// Configuring this list enables ALPN on a client.
//
// WARNING: this function is dangerous because it breaks the usual return value
// convention.
OPENSSL_EXPORT int SSL_set_alpn_protos(SSL *ssl, const uint8_t *protos,
unsigned protos_len);
// SSL_CTX_set_alpn_select_cb sets a callback function on |ctx| that is called
// during ClientHello processing in order to select an ALPN protocol from the
// client's list of offered protocols. Configuring this callback enables ALPN on
// a server.
//
// The callback is passed a wire-format (i.e. a series of non-empty, 8-bit
// length-prefixed strings) ALPN protocol list in |in|. It should set |*out| and
// |*out_len| to the selected protocol and return |SSL_TLSEXT_ERR_OK| on
// success. It does not pass ownership of the buffer. Otherwise, it should
// return |SSL_TLSEXT_ERR_NOACK|. Other |SSL_TLSEXT_ERR_*| values are
// unimplemented and will be treated as |SSL_TLSEXT_ERR_NOACK|.
//
// The cipher suite is selected before negotiating ALPN. The callback may use
// |SSL_get_pending_cipher| to query the cipher suite.
OPENSSL_EXPORT void SSL_CTX_set_alpn_select_cb(
SSL_CTX *ctx, int (*cb)(SSL *ssl, const uint8_t **out, uint8_t *out_len,
const uint8_t *in, unsigned in_len, void *arg),
void *arg);
// SSL_get0_alpn_selected gets the selected ALPN protocol (if any) from |ssl|.
// On return it sets |*out_data| to point to |*out_len| bytes of protocol name
// (not including the leading length-prefix byte). If the server didn't respond
// with a negotiated protocol then |*out_len| will be zero.
OPENSSL_EXPORT void SSL_get0_alpn_selected(const SSL *ssl,
const uint8_t **out_data,
unsigned *out_len);
// SSL_CTX_set_allow_unknown_alpn_protos configures client connections on |ctx|
// to allow unknown ALPN protocols from the server. Otherwise, by default, the
// client will require that the protocol be advertised in
// |SSL_CTX_set_alpn_protos|.
OPENSSL_EXPORT void SSL_CTX_set_allow_unknown_alpn_protos(SSL_CTX *ctx,
int enabled);
// Certificate compression.
//
// Certificates in TLS 1.3 can be compressed[1]. BoringSSL supports this as both
// a client and a server, but does not link against any specific compression
// libraries in order to keep dependencies to a minimum. Instead, hooks for
// compression and decompression can be installed in an |SSL_CTX| to enable
// support.
//
// [1] https://tools.ietf.org/html/draft-ietf-tls-certificate-compression-03.
// ssl_cert_compression_func_t is a pointer to a function that performs
// compression. It must write the compressed representation of |in| to |out|,
// returning one on success and zero on error. The results of compressing
// certificates are not cached internally. Implementations may wish to implement
// their own cache if they expect it to be useful given the certificates that
// they serve.
typedef int (*ssl_cert_compression_func_t)(SSL *ssl, CBB *out,
const uint8_t *in, size_t in_len);
// ssl_cert_decompression_func_t is a pointer to a function that performs
// decompression. The compressed data from the peer is passed as |in| and the
// decompressed result must be exactly |uncompressed_len| bytes long. It returns
// one on success, in which case |*out| must be set to the result of
// decompressing |in|, or zero on error. Setting |*out| transfers ownership,
// i.e. |CRYPTO_BUFFER_free| will be called on |*out| at some point in the
// future. The results of decompressions are not cached internally.
// Implementations may wish to implement their own cache if they expect it to be
// useful.
typedef int (*ssl_cert_decompression_func_t)(SSL *ssl, CRYPTO_BUFFER **out,
size_t uncompressed_len,
const uint8_t *in, size_t in_len);
// SSL_CTX_add_cert_compression_alg registers a certificate compression
// algorithm on |ctx| with ID |alg_id|. (The value of |alg_id| should be an IANA
// assigned value and each can only be registered once.)
//
// One of the function pointers may be NULL to avoid having to implement both
// sides of a compression algorithm if you're only going to use it in one
// direction. In this case, the unimplemented direction acts like it was never
// configured.
//
// For a server, algorithms are registered in preference order with the most
// preferable first. It returns one on success or zero on error.
OPENSSL_EXPORT int SSL_CTX_add_cert_compression_alg(
SSL_CTX *ctx, uint16_t alg_id, ssl_cert_compression_func_t compress,
ssl_cert_decompression_func_t decompress);
// Next protocol negotiation.
//
// The NPN extension (draft-agl-tls-nextprotoneg-03) is the predecessor to ALPN
// and deprecated in favor of it.
// SSL_CTX_set_next_protos_advertised_cb sets a callback that is called when a
// TLS server needs a list of supported protocols for Next Protocol
// Negotiation. The returned list must be in wire format. The list is returned
// by setting |*out| to point to it and |*out_len| to its length. This memory
// will not be modified, but one should assume that |ssl| keeps a reference to
// it.
//
// The callback should return |SSL_TLSEXT_ERR_OK| if it wishes to advertise.
// Otherwise, no such extension will be included in the ServerHello.
OPENSSL_EXPORT void SSL_CTX_set_next_protos_advertised_cb(
SSL_CTX *ctx,
int (*cb)(SSL *ssl, const uint8_t **out, unsigned *out_len, void *arg),
void *arg);
// SSL_CTX_set_next_proto_select_cb sets a callback that is called when a client
// needs to select a protocol from the server's provided list. |*out| must be
// set to point to the selected protocol (which may be within |in|). The length
// of the protocol name must be written into |*out_len|. The server's advertised
// protocols are provided in |in| and |in_len|. The callback can assume that
// |in| is syntactically valid.
//
// The client must select a protocol. It is fatal to the connection if this
// callback returns a value other than |SSL_TLSEXT_ERR_OK|.
//
// Configuring this callback enables NPN on a client.
OPENSSL_EXPORT void SSL_CTX_set_next_proto_select_cb(
SSL_CTX *ctx, int (*cb)(SSL *ssl, uint8_t **out, uint8_t *out_len,
const uint8_t *in, unsigned in_len, void *arg),
void *arg);
// SSL_get0_next_proto_negotiated sets |*out_data| and |*out_len| to point to
// the client's requested protocol for this connection. If the client didn't
// request any protocol, then |*out_data| is set to NULL.
//
// Note that the client can request any protocol it chooses. The value returned
// from this function need not be a member of the list of supported protocols
// provided by the server.
OPENSSL_EXPORT void SSL_get0_next_proto_negotiated(const SSL *ssl,
const uint8_t **out_data,
unsigned *out_len);
// SSL_select_next_proto implements the standard protocol selection. It is
// expected that this function is called from the callback set by
// |SSL_CTX_set_next_proto_select_cb|.
//
// |peer| and |supported| must be vectors of 8-bit, length-prefixed byte strings
// containing the peer and locally-configured protocols, respectively. The
// length byte itself is not included in the length. A byte string of length 0
// is invalid. No byte string may be truncated. |supported| is assumed to be
// non-empty.
//
// This function finds the first protocol in |peer| which is also in
// |supported|. If one was found, it sets |*out| and |*out_len| to point to it
// and returns |OPENSSL_NPN_NEGOTIATED|. Otherwise, it returns
// |OPENSSL_NPN_NO_OVERLAP| and sets |*out| and |*out_len| to the first
// supported protocol.
OPENSSL_EXPORT int SSL_select_next_proto(uint8_t **out, uint8_t *out_len,
const uint8_t *peer, unsigned peer_len,
const uint8_t *supported,
unsigned supported_len);
#define OPENSSL_NPN_UNSUPPORTED 0
#define OPENSSL_NPN_NEGOTIATED 1
#define OPENSSL_NPN_NO_OVERLAP 2
// Channel ID.
//
// See draft-balfanz-tls-channelid-01.
// SSL_CTX_set_tls_channel_id_enabled configures whether connections associated
// with |ctx| should enable Channel ID.
OPENSSL_EXPORT void SSL_CTX_set_tls_channel_id_enabled(SSL_CTX *ctx,
int enabled);
// SSL_set_tls_channel_id_enabled configures whether |ssl| should enable Channel
// ID.
OPENSSL_EXPORT void SSL_set_tls_channel_id_enabled(SSL *ssl, int enabled);
// SSL_CTX_set1_tls_channel_id configures a TLS client to send a TLS Channel ID
// to compatible servers. |private_key| must be a P-256 EC key. It returns one
// on success and zero on error.
OPENSSL_EXPORT int SSL_CTX_set1_tls_channel_id(SSL_CTX *ctx,
EVP_PKEY *private_key);
// SSL_set1_tls_channel_id configures a TLS client to send a TLS Channel ID to
// compatible servers. |private_key| must be a P-256 EC key. It returns one on
// success and zero on error.
OPENSSL_EXPORT int SSL_set1_tls_channel_id(SSL *ssl, EVP_PKEY *private_key);
// SSL_get_tls_channel_id gets the client's TLS Channel ID from a server |SSL*|
// and copies up to the first |max_out| bytes into |out|. The Channel ID
// consists of the client's P-256 public key as an (x,y) pair where each is a
// 32-byte, big-endian field element. It returns 0 if the client didn't offer a
// Channel ID and the length of the complete Channel ID otherwise.
OPENSSL_EXPORT size_t SSL_get_tls_channel_id(SSL *ssl, uint8_t *out,
size_t max_out);
// SSL_CTX_set_channel_id_cb sets a callback to be called when a TLS Channel ID
// is requested. The callback may set |*out_pkey| to a key, passing a reference
// to the caller. If none is returned, the handshake will pause and
// |SSL_get_error| will return |SSL_ERROR_WANT_CHANNEL_ID_LOOKUP|.
//
// See also |SSL_ERROR_WANT_CHANNEL_ID_LOOKUP|.
OPENSSL_EXPORT void SSL_CTX_set_channel_id_cb(
SSL_CTX *ctx, void (*channel_id_cb)(SSL *ssl, EVP_PKEY **out_pkey));
// SSL_CTX_get_channel_id_cb returns the callback set by
// |SSL_CTX_set_channel_id_cb|.
OPENSSL_EXPORT void (*SSL_CTX_get_channel_id_cb(SSL_CTX *ctx))(
SSL *ssl, EVP_PKEY **out_pkey);
// Token Binding.
//
// See draft-ietf-tokbind-protocol-16.
// SSL_set_token_binding_params sets |params| as the Token Binding Key
// parameters (section 3 of draft-ietf-tokbind-protocol-16) to negotiate on the
// connection. If this function is not called, or if |len| is 0, then this
// endpoint will not attempt to negotiate Token Binding. |params| are provided
// in preference order, with the more preferred parameters at the beginning of
// the list. This function returns 1 on success and 0 on failure.
OPENSSL_EXPORT int SSL_set_token_binding_params(SSL *ssl, const uint8_t *params,
size_t len);
// SSL_is_token_binding_negotiated returns 1 if Token Binding was negotiated
// on this connection and 0 otherwise. On a server, it is possible for this
// function to return 1 when the client's view of the connection is that Token
// Binding was not negotiated. This occurs when the server indicates a version
// of Token Binding less than the client's minimum version.
OPENSSL_EXPORT int SSL_is_token_binding_negotiated(const SSL *ssl);
// SSL_get_negotiated_token_binding_param returns the TokenBindingKeyParameters
// enum value that was negotiated. It is only valid to call this function if
// SSL_is_token_binding_negotiated returned 1, otherwise this function returns
// an undefined value.
OPENSSL_EXPORT uint8_t SSL_get_negotiated_token_binding_param(const SSL *ssl);
// DTLS-SRTP.
//
// See RFC 5764.
// srtp_protection_profile_st (aka |SRTP_PROTECTION_PROFILE|) is an SRTP
// profile for use with the use_srtp extension.
struct srtp_protection_profile_st {
const char *name;
unsigned long id;
} /* SRTP_PROTECTION_PROFILE */;
DEFINE_CONST_STACK_OF(SRTP_PROTECTION_PROFILE)
// SRTP_* define constants for SRTP profiles.
#define SRTP_AES128_CM_SHA1_80 0x0001
#define SRTP_AES128_CM_SHA1_32 0x0002
#define SRTP_AES128_F8_SHA1_80 0x0003
#define SRTP_AES128_F8_SHA1_32 0x0004
#define SRTP_NULL_SHA1_80 0x0005
#define SRTP_NULL_SHA1_32 0x0006
#define SRTP_AEAD_AES_128_GCM 0x0007
#define SRTP_AEAD_AES_256_GCM 0x0008
// SSL_CTX_set_srtp_profiles enables SRTP for all SSL objects created from
// |ctx|. |profile| contains a colon-separated list of profile names. It returns
// one on success and zero on failure.
OPENSSL_EXPORT int SSL_CTX_set_srtp_profiles(SSL_CTX *ctx,
const char *profiles);
// SSL_set_srtp_profiles enables SRTP for |ssl|. |profile| contains a
// colon-separated list of profile names. It returns one on success and zero on
// failure.
OPENSSL_EXPORT int SSL_set_srtp_profiles(SSL *ssl, const char *profiles);
// SSL_get_srtp_profiles returns the SRTP profiles supported by |ssl|.
OPENSSL_EXPORT STACK_OF(SRTP_PROTECTION_PROFILE) *SSL_get_srtp_profiles(
SSL *ssl);
// SSL_get_selected_srtp_profile returns the selected SRTP profile, or NULL if
// SRTP was not negotiated.
OPENSSL_EXPORT const SRTP_PROTECTION_PROFILE *SSL_get_selected_srtp_profile(
SSL *ssl);
// Pre-shared keys.
//
// Connections may be configured with PSK (Pre-Shared Key) cipher suites. These
// authenticate using out-of-band pre-shared keys rather than certificates. See
// RFC 4279.
//
// This implementation uses NUL-terminated C strings for identities and identity
// hints, so values with a NUL character are not supported. (RFC 4279 does not
// specify the format of an identity.)
// PSK_MAX_IDENTITY_LEN is the maximum supported length of a PSK identity,
// excluding the NUL terminator.
#define PSK_MAX_IDENTITY_LEN 128
// PSK_MAX_PSK_LEN is the maximum supported length of a pre-shared key.
#define PSK_MAX_PSK_LEN 256
// SSL_CTX_set_psk_client_callback sets the callback to be called when PSK is
// negotiated on the client. This callback must be set to enable PSK cipher
// suites on the client.
//
// The callback is passed the identity hint in |hint| or NULL if none was
// provided. It should select a PSK identity and write the identity and the
// corresponding PSK to |identity| and |psk|, respectively. The identity is
// written as a NUL-terminated C string of length (excluding the NUL terminator)
// at most |max_identity_len|. The PSK's length must be at most |max_psk_len|.
// The callback returns the length of the PSK or 0 if no suitable identity was
// found.
OPENSSL_EXPORT void SSL_CTX_set_psk_client_callback(
SSL_CTX *ctx, unsigned (*cb)(SSL *ssl, const char *hint, char *identity,
unsigned max_identity_len, uint8_t *psk,
unsigned max_psk_len));
// SSL_set_psk_client_callback sets the callback to be called when PSK is
// negotiated on the client. This callback must be set to enable PSK cipher
// suites on the client. See also |SSL_CTX_set_psk_client_callback|.
OPENSSL_EXPORT void SSL_set_psk_client_callback(
SSL *ssl, unsigned (*cb)(SSL *ssl, const char *hint, char *identity,
unsigned max_identity_len, uint8_t *psk,
unsigned max_psk_len));
// SSL_CTX_set_psk_server_callback sets the callback to be called when PSK is
// negotiated on the server. This callback must be set to enable PSK cipher
// suites on the server.
//
// The callback is passed the identity in |identity|. It should write a PSK of
// length at most |max_psk_len| to |psk| and return the number of bytes written
// or zero if the PSK identity is unknown.
OPENSSL_EXPORT void SSL_CTX_set_psk_server_callback(
SSL_CTX *ctx, unsigned (*cb)(SSL *ssl, const char *identity, uint8_t *psk,
unsigned max_psk_len));
// SSL_set_psk_server_callback sets the callback to be called when PSK is
// negotiated on the server. This callback must be set to enable PSK cipher
// suites on the server. See also |SSL_CTX_set_psk_server_callback|.
OPENSSL_EXPORT void SSL_set_psk_server_callback(
SSL *ssl, unsigned (*cb)(SSL *ssl, const char *identity, uint8_t *psk,
unsigned max_psk_len));
// SSL_CTX_use_psk_identity_hint configures server connections to advertise an
// identity hint of |identity_hint|. It returns one on success and zero on
// error.
OPENSSL_EXPORT int SSL_CTX_use_psk_identity_hint(SSL_CTX *ctx,
const char *identity_hint);
// SSL_use_psk_identity_hint configures server connections to advertise an
// identity hint of |identity_hint|. It returns one on success and zero on
// error.
OPENSSL_EXPORT int SSL_use_psk_identity_hint(SSL *ssl,
const char *identity_hint);
// SSL_get_psk_identity_hint returns the PSK identity hint advertised for |ssl|
// or NULL if there is none.
OPENSSL_EXPORT const char *SSL_get_psk_identity_hint(const SSL *ssl);
// SSL_get_psk_identity, after the handshake completes, returns the PSK identity
// that was negotiated by |ssl| or NULL if PSK was not used.
OPENSSL_EXPORT const char *SSL_get_psk_identity(const SSL *ssl);
// QUIC transport parameters.
//
// draft-ietf-quic-tls defines a new TLS extension quic_transport_parameters
// used by QUIC for each endpoint to unilaterally declare its supported
// transport parameters. draft-ietf-quic-transport (section 7.4) defines the
// contents of that extension (a TransportParameters struct) and describes how
// to handle it and its semantic meaning.
//
// BoringSSL handles this extension as an opaque byte string. The caller is
// responsible for serializing and parsing it.
// SSL_set_quic_transport_params configures |ssl| to send |params| (of length
// |params_len|) in the quic_transport_parameters extension in either the
// ClientHello or EncryptedExtensions handshake message. This extension will
// only be sent if the TLS version is at least 1.3, and for a server, only if
// the client sent the extension. The buffer pointed to by |params| only need be
// valid for the duration of the call to this function. This function returns 1
// on success and 0 on failure.
OPENSSL_EXPORT int SSL_set_quic_transport_params(SSL *ssl,
const uint8_t *params,
size_t params_len);
// SSL_get_peer_quic_transport_params provides the caller with the value of the
// quic_transport_parameters extension sent by the peer. A pointer to the buffer
// containing the TransportParameters will be put in |*out_params|, and its
// length in |*params_len|. This buffer will be valid for the lifetime of the
// |SSL|. If no params were received from the peer, |*out_params_len| will be 0.
OPENSSL_EXPORT void SSL_get_peer_quic_transport_params(const SSL *ssl,
const uint8_t **out_params,
size_t *out_params_len);
// QUIC integration.
//
// QUIC acts as an underlying transport for the TLS 1.3 handshake. The following
// functions allow a QUIC implementation to serve as the underlying transport as
// described in draft-ietf-quic-tls.
//
// When configured for QUIC, |SSL_do_handshake| will drive the handshake as
// before, but it will not use the configured |BIO|. It will call functions on
// |SSL_QUIC_METHOD| to configure secrets and send data. If data is needed from
// the peer, it will return |SSL_ERROR_WANT_READ|. When received, the caller
// should call |SSL_provide_quic_data| and then |SSL_do_handshake| to continue
// the handshake. It is an error to call |SSL_read| and |SSL_write| in QUIC.
//
// Note that secrets for an encryption level may be available to QUIC before the
// level is active in TLS. Callers should use |SSL_quic_read_level| to determine
// the active read level for |SSL_provide_quic_data|. |SSL_do_handshake| will
// pass the active write level to |SSL_QUIC_METHOD| when writing data. Callers
// can use |SSL_quic_write_level| to query the active write level when
// generating their own errors.
//
// See https://tools.ietf.org/html/draft-ietf-quic-tls-15#section-4.1 for more
// details.
//
// To avoid DoS attacks, the QUIC implementation must limit the amount of data
// being queued up. The implementation can call
// |SSL_quic_max_handshake_flight_len| to get the maximum buffer length at each
// encryption level.
//
// Note: 0-RTT and post-handshake tickets are not currently supported via this
// API.
// ssl_encryption_level_t represents a specific QUIC encryption level used to
// transmit handshake messages.
enum ssl_encryption_level_t {
ssl_encryption_initial = 0,
ssl_encryption_early_data,
ssl_encryption_handshake,
ssl_encryption_application,
};
// ssl_quic_method_st (aka |SSL_QUIC_METHOD|) describes custom QUIC hooks.
struct ssl_quic_method_st {
// set_encryption_secrets configures the read and write secrets for the given
// encryption level. This function will always be called before an encryption
// level other than |ssl_encryption_initial| is used. Note, however, that
// secrets for a level may be configured before TLS is ready to send or accept
// data at that level.
//
// When reading packets at a given level, the QUIC implementation must send
// ACKs at the same level, so this function provides read and write secrets
// together. The exception is |ssl_encryption_early_data|, where secrets are
// only available in the client to server direction. The other secret will be
// NULL. The server acknowledges such data at |ssl_encryption_application|,
// which will be configured in the same |SSL_do_handshake| call.
//
// This function should use |SSL_get_current_cipher| to determine the TLS
// cipher suite.
//
// It returns one on success and zero on error.
int (*set_encryption_secrets)(SSL *ssl, enum ssl_encryption_level_t level,
const uint8_t *read_secret,
const uint8_t *write_secret, size_t secret_len);
// add_handshake_data adds handshake data to the current flight at the given
// encryption level. It returns one on success and zero on error.
//
// BoringSSL will pack data from a single encryption level together, but a
// single handshake flight may include multiple encryption levels. Callers
// should defer writing data to the network until |flush_flight| to better
// pack QUIC packets into transport datagrams.
int (*add_handshake_data)(SSL *ssl, enum ssl_encryption_level_t level,
const uint8_t *data, size_t len);
// flush_flight is called when the current flight is complete and should be
// written to the transport. Note a flight may contain data at several
// encryption levels. It returns one on success and zero on error.
int (*flush_flight)(SSL *ssl);
// send_alert sends a fatal alert at the specified encryption level. It
// returns one on success and zero on error.
int (*send_alert)(SSL *ssl, enum ssl_encryption_level_t level, uint8_t alert);
};
// SSL_quic_max_handshake_flight_len returns returns the maximum number of bytes
// that may be received at the given encryption level. This function should be
// used to limit buffering in the QUIC implementation.
//
// See https://tools.ietf.org/html/draft-ietf-quic-transport-16#section-4.4.
OPENSSL_EXPORT size_t SSL_quic_max_handshake_flight_len(
const SSL *ssl, enum ssl_encryption_level_t level);
// SSL_quic_read_level returns the current read encryption level.
OPENSSL_EXPORT enum ssl_encryption_level_t SSL_quic_read_level(const SSL *ssl);
// SSL_quic_write_level returns the current write encryption level.
OPENSSL_EXPORT enum ssl_encryption_level_t SSL_quic_write_level(const SSL *ssl);
// SSL_provide_quic_data provides data from QUIC at a particular encryption
// level |level|. It is an error to call this function outside of the handshake
// or with an encryption level other than the current read level. It returns one
// on success and zero on error.
OPENSSL_EXPORT int SSL_provide_quic_data(SSL *ssl,
enum ssl_encryption_level_t level,
const uint8_t *data, size_t len);
// SSL_CTX_set_quic_method configures the QUIC hooks. This should only be
// configured with a minimum version of TLS 1.3. |quic_method| must remain valid
// for the lifetime of |ctx|. It returns one on success and zero on error.
OPENSSL_EXPORT int SSL_CTX_set_quic_method(SSL_CTX *ctx,
const SSL_QUIC_METHOD *quic_method);
// Early data.
//
// WARNING: 0-RTT support in BoringSSL is currently experimental and not fully
// implemented. It may cause interoperability or security failures when used.
//
// Early data, or 0-RTT, is a feature in TLS 1.3 which allows clients to send
// data on the first flight during a resumption handshake. This can save a
// round-trip in some application protocols.
//
// WARNING: A 0-RTT handshake has different security properties from normal
// handshake, so it is off by default unless opted in. In particular, early data
// is replayable by a network attacker. Callers must account for this when
// sending or processing data before the handshake is confirmed. See RFC 8446
// for more information.
//
// As a server, if early data is accepted, |SSL_do_handshake| will complete as
// soon as the ClientHello is processed and server flight sent. |SSL_write| may
// be used to send half-RTT data. |SSL_read| will consume early data and
// transition to 1-RTT data as appropriate. Prior to the transition,
// |SSL_in_init| will report the handshake is still in progress. Callers may use
// it or |SSL_in_early_data| to defer or reject requests as needed.
//
// Early data as a client is more complex. If the offered session (see
// |SSL_set_session|) is 0-RTT-capable, the handshake will return after sending
// the ClientHello. The predicted peer certificates and ALPN protocol will be
// available via the usual APIs. |SSL_write| will write early data, up to the
// session's limit. Writes past this limit and |SSL_read| will complete the
// handshake before continuing. Callers may also call |SSL_do_handshake| again
// to complete the handshake sooner.
//
// If the server accepts early data, the handshake will succeed. |SSL_read| and
// |SSL_write| will then act as in a 1-RTT handshake. The peer certificates and
// ALPN protocol will be as predicted and need not be re-queried.
//
// If the server rejects early data, |SSL_do_handshake| (and thus |SSL_read| and
// |SSL_write|) will then fail with |SSL_get_error| returning
// |SSL_ERROR_EARLY_DATA_REJECTED|. The caller should treat this as a connection
// error and most likely perform a high-level retry. Note the server may still
// have processed the early data due to attacker replays.
//
// To then continue the handshake on the original connection, use
// |SSL_reset_early_data_reject|. The connection will then behave as one which
// had not yet completed the handshake. This allows a faster retry than making a
// fresh connection. |SSL_do_handshake| will complete the full handshake,
// possibly resulting in different peer certificates, ALPN protocol, and other
// properties. The caller must disregard any values from before the reset and
// query again.
//
// Finally, to implement the fallback described in RFC 8446 appendix D.3, retry
// on a fresh connection without 0-RTT if the handshake fails with
// |SSL_R_WRONG_VERSION_ON_EARLY_DATA|.
// SSL_CTX_set_early_data_enabled sets whether early data is allowed to be used
// with resumptions using |ctx|.
OPENSSL_EXPORT void SSL_CTX_set_early_data_enabled(SSL_CTX *ctx, int enabled);
// SSL_set_early_data_enabled sets whether early data is allowed to be used
// with resumptions using |ssl|. See |SSL_CTX_set_early_data_enabled| for more
// information.
OPENSSL_EXPORT void SSL_set_early_data_enabled(SSL *ssl, int enabled);
// SSL_in_early_data returns one if |ssl| has a pending handshake that has
// progressed enough to send or receive early data. Clients may call |SSL_write|
// to send early data, but |SSL_read| will complete the handshake before
// accepting application data. Servers may call |SSL_read| to read early data
// and |SSL_write| to send half-RTT data.
OPENSSL_EXPORT int SSL_in_early_data(const SSL *ssl);
// SSL_early_data_accepted returns whether early data was accepted on the
// handshake performed by |ssl|.
OPENSSL_EXPORT int SSL_early_data_accepted(const SSL *ssl);
// SSL_reset_early_data_reject resets |ssl| after an early data reject. All
// 0-RTT state is discarded, including any pending |SSL_write| calls. The caller
// should treat |ssl| as a logically fresh connection, usually by driving the
// handshake to completion using |SSL_do_handshake|.
//
// It is an error to call this function on an |SSL| object that is not signaling
// |SSL_ERROR_EARLY_DATA_REJECTED|.
OPENSSL_EXPORT void SSL_reset_early_data_reject(SSL *ssl);
// SSL_export_early_keying_material behaves like |SSL_export_keying_material|,
// but it uses the early exporter. The operation will fail if |ssl| did not
// negotiate TLS 1.3 or 0-RTT.
OPENSSL_EXPORT int SSL_export_early_keying_material(
SSL *ssl, uint8_t *out, size_t out_len, const char *label, size_t label_len,
const uint8_t *context, size_t context_len);
// Alerts.
//
// TLS uses alerts to signal error conditions. Alerts have a type (warning or
// fatal) and description. OpenSSL internally handles fatal alerts with
// dedicated error codes (see |SSL_AD_REASON_OFFSET|). Except for close_notify,
// warning alerts are silently ignored and may only be surfaced with
// |SSL_CTX_set_info_callback|.
// SSL_AD_REASON_OFFSET is the offset between error reasons and |SSL_AD_*|
// values. Any error code under |ERR_LIB_SSL| with an error reason above this
// value corresponds to an alert description. Consumers may add or subtract
// |SSL_AD_REASON_OFFSET| to convert between them.
//
// make_errors.go reserves error codes above 1000 for manually-assigned errors.
// This value must be kept in sync with reservedReasonCode in make_errors.h
#define SSL_AD_REASON_OFFSET 1000
// SSL_AD_* are alert descriptions.
#define SSL_AD_CLOSE_NOTIFY SSL3_AD_CLOSE_NOTIFY
#define SSL_AD_UNEXPECTED_MESSAGE SSL3_AD_UNEXPECTED_MESSAGE
#define SSL_AD_BAD_RECORD_MAC SSL3_AD_BAD_RECORD_MAC
#define SSL_AD_DECRYPTION_FAILED TLS1_AD_DECRYPTION_FAILED
#define SSL_AD_RECORD_OVERFLOW TLS1_AD_RECORD_OVERFLOW
#define SSL_AD_DECOMPRESSION_FAILURE SSL3_AD_DECOMPRESSION_FAILURE
#define SSL_AD_HANDSHAKE_FAILURE SSL3_AD_HANDSHAKE_FAILURE
#define SSL_AD_NO_CERTIFICATE SSL3_AD_NO_CERTIFICATE // Legacy SSL 3.0 value
#define SSL_AD_BAD_CERTIFICATE SSL3_AD_BAD_CERTIFICATE
#define SSL_AD_UNSUPPORTED_CERTIFICATE SSL3_AD_UNSUPPORTED_CERTIFICATE
#define SSL_AD_CERTIFICATE_REVOKED SSL3_AD_CERTIFICATE_REVOKED
#define SSL_AD_CERTIFICATE_EXPIRED SSL3_AD_CERTIFICATE_EXPIRED
#define SSL_AD_CERTIFICATE_UNKNOWN SSL3_AD_CERTIFICATE_UNKNOWN
#define SSL_AD_ILLEGAL_PARAMETER SSL3_AD_ILLEGAL_PARAMETER
#define SSL_AD_UNKNOWN_CA TLS1_AD_UNKNOWN_CA
#define SSL_AD_ACCESS_DENIED TLS1_AD_ACCESS_DENIED
#define SSL_AD_DECODE_ERROR TLS1_AD_DECODE_ERROR
#define SSL_AD_DECRYPT_ERROR TLS1_AD_DECRYPT_ERROR
#define SSL_AD_EXPORT_RESTRICTION TLS1_AD_EXPORT_RESTRICTION
#define SSL_AD_PROTOCOL_VERSION TLS1_AD_PROTOCOL_VERSION
#define SSL_AD_INSUFFICIENT_SECURITY TLS1_AD_INSUFFICIENT_SECURITY
#define SSL_AD_INTERNAL_ERROR TLS1_AD_INTERNAL_ERROR
#define SSL_AD_INAPPROPRIATE_FALLBACK SSL3_AD_INAPPROPRIATE_FALLBACK
#define SSL_AD_USER_CANCELLED TLS1_AD_USER_CANCELLED
#define SSL_AD_NO_RENEGOTIATION TLS1_AD_NO_RENEGOTIATION
#define SSL_AD_MISSING_EXTENSION TLS1_AD_MISSING_EXTENSION
#define SSL_AD_UNSUPPORTED_EXTENSION TLS1_AD_UNSUPPORTED_EXTENSION
#define SSL_AD_CERTIFICATE_UNOBTAINABLE TLS1_AD_CERTIFICATE_UNOBTAINABLE
#define SSL_AD_UNRECOGNIZED_NAME TLS1_AD_UNRECOGNIZED_NAME
#define SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE \
TLS1_AD_BAD_CERTIFICATE_STATUS_RESPONSE
#define SSL_AD_BAD_CERTIFICATE_HASH_VALUE TLS1_AD_BAD_CERTIFICATE_HASH_VALUE
#define SSL_AD_UNKNOWN_PSK_IDENTITY TLS1_AD_UNKNOWN_PSK_IDENTITY
#define SSL_AD_CERTIFICATE_REQUIRED TLS1_AD_CERTIFICATE_REQUIRED
// SSL_alert_type_string_long returns a string description of |value| as an
// alert type (warning or fatal).
OPENSSL_EXPORT const char *SSL_alert_type_string_long(int value);
// SSL_alert_desc_string_long returns a string description of |value| as an
// alert description or "unknown" if unknown.
OPENSSL_EXPORT const char *SSL_alert_desc_string_long(int value);
// SSL_send_fatal_alert sends a fatal alert over |ssl| of the specified type,
// which should be one of the |SSL_AD_*| constants. It returns one on success
// and <= 0 on error. The caller should pass the return value into
// |SSL_get_error| to determine how to proceed. Once this function has been
// called, future calls to |SSL_write| will fail.
//
// If retrying a failed operation due to |SSL_ERROR_WANT_WRITE|, subsequent
// calls must use the same |alert| parameter.
OPENSSL_EXPORT int SSL_send_fatal_alert(SSL *ssl, uint8_t alert);
// ex_data functions.
//
// See |ex_data.h| for details.
OPENSSL_EXPORT int SSL_set_ex_data(SSL *ssl, int idx, void *data);
OPENSSL_EXPORT void *SSL_get_ex_data(const SSL *ssl, int idx);
OPENSSL_EXPORT int SSL_get_ex_new_index(long argl, void *argp,
CRYPTO_EX_unused *unused,
CRYPTO_EX_dup *dup_unused,
CRYPTO_EX_free *free_func);
OPENSSL_EXPORT int SSL_SESSION_set_ex_data(SSL_SESSION *session, int idx,
void *data);
OPENSSL_EXPORT void *SSL_SESSION_get_ex_data(const SSL_SESSION *session,
int idx);
OPENSSL_EXPORT int SSL_SESSION_get_ex_new_index(long argl, void *argp,
CRYPTO_EX_unused *unused,
CRYPTO_EX_dup *dup_unused,
CRYPTO_EX_free *free_func);
OPENSSL_EXPORT int SSL_CTX_set_ex_data(SSL_CTX *ctx, int idx, void *data);
OPENSSL_EXPORT void *SSL_CTX_get_ex_data(const SSL_CTX *ctx, int idx);
OPENSSL_EXPORT int SSL_CTX_get_ex_new_index(long argl, void *argp,
CRYPTO_EX_unused *unused,
CRYPTO_EX_dup *dup_unused,
CRYPTO_EX_free *free_func);
// Low-level record-layer state.
// SSL_get_ivs sets |*out_iv_len| to the length of the IVs for the ciphers
// underlying |ssl| and sets |*out_read_iv| and |*out_write_iv| to point to the
// current IVs for the read and write directions. This is only meaningful for
// connections with implicit IVs (i.e. CBC mode with TLS 1.0).
//
// It returns one on success or zero on error.
OPENSSL_EXPORT int SSL_get_ivs(const SSL *ssl, const uint8_t **out_read_iv,
const uint8_t **out_write_iv,
size_t *out_iv_len);
// SSL_get_key_block_len returns the length of |ssl|'s key block.
OPENSSL_EXPORT size_t SSL_get_key_block_len(const SSL *ssl);
// SSL_generate_key_block generates |out_len| bytes of key material for |ssl|'s
// current connection state.
OPENSSL_EXPORT int SSL_generate_key_block(const SSL *ssl, uint8_t *out,
size_t out_len);
// SSL_get_read_sequence returns, in TLS, the expected sequence number of the
// next incoming record in the current epoch. In DTLS, it returns the maximum
// sequence number received in the current epoch and includes the epoch number
// in the two most significant bytes.
OPENSSL_EXPORT uint64_t SSL_get_read_sequence(const SSL *ssl);
// SSL_get_write_sequence returns the sequence number of the next outgoing
// record in the current epoch. In DTLS, it includes the epoch number in the
// two most significant bytes.
OPENSSL_EXPORT uint64_t SSL_get_write_sequence(const SSL *ssl);
// Obscure functions.
// SSL_get_structure_sizes returns the sizes of the SSL, SSL_CTX and
// SSL_SESSION structures so that a test can ensure that outside code agrees on
// these values.
OPENSSL_EXPORT void SSL_get_structure_sizes(size_t *ssl_size,
size_t *ssl_ctx_size,
size_t *ssl_session_size);
// SSL_CTX_set_msg_callback installs |cb| as the message callback for |ctx|.
// This callback will be called when sending or receiving low-level record
// headers, complete handshake messages, ChangeCipherSpec, and alerts.
// |write_p| is one for outgoing messages and zero for incoming messages.
//
// For each record header, |cb| is called with |version| = 0 and |content_type|
// = |SSL3_RT_HEADER|. The |len| bytes from |buf| contain the header. Note that
// this does not include the record body. If the record is sealed, the length
// in the header is the length of the ciphertext.
//
// For each handshake message, ChangeCipherSpec, and alert, |version| is the
// protocol version and |content_type| is the corresponding record type. The
// |len| bytes from |buf| contain the handshake message, one-byte
// ChangeCipherSpec body, and two-byte alert, respectively.
//
// For a V2ClientHello, |version| is |SSL2_VERSION|, |content_type| is zero, and
// the |len| bytes from |buf| contain the V2ClientHello structure.
OPENSSL_EXPORT void SSL_CTX_set_msg_callback(
SSL_CTX *ctx, void (*cb)(int write_p, int version, int content_type,
const void *buf, size_t len, SSL *ssl, void *arg));
// SSL_CTX_set_msg_callback_arg sets the |arg| parameter of the message
// callback.
OPENSSL_EXPORT void SSL_CTX_set_msg_callback_arg(SSL_CTX *ctx, void *arg);
// SSL_set_msg_callback installs |cb| as the message callback of |ssl|. See
// |SSL_CTX_set_msg_callback| for when this callback is called.
OPENSSL_EXPORT void SSL_set_msg_callback(
SSL *ssl, void (*cb)(int write_p, int version, int content_type,
const void *buf, size_t len, SSL *ssl, void *arg));
// SSL_set_msg_callback_arg sets the |arg| parameter of the message callback.
OPENSSL_EXPORT void SSL_set_msg_callback_arg(SSL *ssl, void *arg);
// SSL_CTX_set_keylog_callback configures a callback to log key material. This
// is intended for debugging use with tools like Wireshark. The |cb| function
// should log |line| followed by a newline, synchronizing with any concurrent
// access to the log.
//
// The format is described in
// https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/Key_Log_Format.
OPENSSL_EXPORT void SSL_CTX_set_keylog_callback(
SSL_CTX *ctx, void (*cb)(const SSL *ssl, const char *line));
// SSL_CTX_get_keylog_callback returns the callback configured by
// |SSL_CTX_set_keylog_callback|.
OPENSSL_EXPORT void (*SSL_CTX_get_keylog_callback(const SSL_CTX *ctx))(
const SSL *ssl, const char *line);
// SSL_CTX_set_current_time_cb configures a callback to retrieve the current
// time, which should be set in |*out_clock|. This can be used for testing
// purposes; for example, a callback can be configured that returns a time
// set explicitly by the test. The |ssl| pointer passed to |cb| is always null.
OPENSSL_EXPORT void SSL_CTX_set_current_time_cb(
SSL_CTX *ctx, void (*cb)(const SSL *ssl, struct timeval *out_clock));
// SSL_set_shed_handshake_config allows some of the configuration of |ssl| to be
// freed after its handshake completes. Once configuration has been shed, APIs
// that query it may fail. "Configuration" in this context means anything that
// was set by the caller, as distinct from information derived from the
// handshake. For example, |SSL_get_ciphers| queries how the |SSL| was
// configured by the caller, and fails after configuration has been shed,
// whereas |SSL_get_cipher| queries the result of the handshake, and is
// unaffected by configuration shedding.
//
// If configuration shedding is enabled, it is an error to call |SSL_clear|.
//
// Note that configuration shedding as a client additionally depends on
// renegotiation being disabled (see |SSL_set_renegotiate_mode|). If
// renegotiation is possible, the configuration will be retained. If
// configuration shedding is enabled and renegotiation later disabled after the
// handshake, |SSL_set_renegotiate_mode| will shed configuration then. This may
// be useful for clients which support renegotiation with some ALPN protocols,
// such as HTTP/1.1, and not others, such as HTTP/2.
OPENSSL_EXPORT void SSL_set_shed_handshake_config(SSL *ssl, int enable);
enum ssl_renegotiate_mode_t {
ssl_renegotiate_never = 0,
ssl_renegotiate_once,
ssl_renegotiate_freely,
ssl_renegotiate_ignore,
};
// SSL_set_renegotiate_mode configures how |ssl|, a client, reacts to
// renegotiation attempts by a server. If |ssl| is a server, peer-initiated
// renegotiations are *always* rejected and this function does nothing.
//
// The renegotiation mode defaults to |ssl_renegotiate_never|, but may be set
// at any point in a connection's lifetime. Set it to |ssl_renegotiate_once| to
// allow one renegotiation, |ssl_renegotiate_freely| to allow all
// renegotiations or |ssl_renegotiate_ignore| to ignore HelloRequest messages.
// Note that ignoring HelloRequest messages may cause the connection to stall
// if the server waits for the renegotiation to complete.
//
// If configuration shedding is enabled (see |SSL_set_shed_handshake_config|),
// configuration is released if, at any point after the handshake, renegotiation
// is disabled. It is not possible to switch from disabling renegotiation to
// enabling it on a given connection. Callers that condition renegotiation on,
// e.g., ALPN must enable renegotiation before the handshake and conditionally
// disable it afterwards.
//
// There is no support in BoringSSL for initiating renegotiations as a client
// or server.
OPENSSL_EXPORT void SSL_set_renegotiate_mode(SSL *ssl,
enum ssl_renegotiate_mode_t mode);
// SSL_renegotiate_pending returns one if |ssl| is in the middle of a
// renegotiation.
OPENSSL_EXPORT int SSL_renegotiate_pending(SSL *ssl);
// SSL_total_renegotiations returns the total number of renegotiation handshakes
// performed by |ssl|. This includes the pending renegotiation, if any.
OPENSSL_EXPORT int SSL_total_renegotiations(const SSL *ssl);
// tls13_variant_t determines what TLS 1.3 variant to negotiate.
enum tls13_variant_t {
tls13_rfc = 0,
tls13_draft23,
tls13_draft28,
// tls13_all enables all variants of TLS 1.3, to keep the transition smooth as
// early adopters move to the final version.
tls13_all,
};
// SSL_CTX_set_tls13_variant sets which variant of TLS 1.3 we negotiate. On the
// server, if |variant| is not |tls13_default|, all variants are enabled. On the
// client, only the configured variant is enabled.
OPENSSL_EXPORT void SSL_CTX_set_tls13_variant(SSL_CTX *ctx,
enum tls13_variant_t variant);
// SSL_set_tls13_variant sets which variant of TLS 1.3 we negotiate. On the
// server, if |variant| is not |tls13_default|, all variants are enabled. On the
// client, only the configured variant is enabled.
OPENSSL_EXPORT void SSL_set_tls13_variant(SSL *ssl,
enum tls13_variant_t variant);
// SSL_MAX_CERT_LIST_DEFAULT is the default maximum length, in bytes, of a peer
// certificate chain.
#define SSL_MAX_CERT_LIST_DEFAULT (1024 * 100)
// SSL_CTX_get_max_cert_list returns the maximum length, in bytes, of a peer
// certificate chain accepted by |ctx|.
OPENSSL_EXPORT size_t SSL_CTX_get_max_cert_list(const SSL_CTX *ctx);
// SSL_CTX_set_max_cert_list sets the maximum length, in bytes, of a peer
// certificate chain to |max_cert_list|. This affects how much memory may be
// consumed during the handshake.
OPENSSL_EXPORT void SSL_CTX_set_max_cert_list(SSL_CTX *ctx,
size_t max_cert_list);
// SSL_get_max_cert_list returns the maximum length, in bytes, of a peer
// certificate chain accepted by |ssl|.
OPENSSL_EXPORT size_t SSL_get_max_cert_list(const SSL *ssl);
// SSL_set_max_cert_list sets the maximum length, in bytes, of a peer
// certificate chain to |max_cert_list|. This affects how much memory may be
// consumed during the handshake.
OPENSSL_EXPORT void SSL_set_max_cert_list(SSL *ssl, size_t max_cert_list);
// SSL_CTX_set_max_send_fragment sets the maximum length, in bytes, of records
// sent by |ctx|. Beyond this length, handshake messages and application data
// will be split into multiple records. It returns one on success or zero on
// error.
OPENSSL_EXPORT int SSL_CTX_set_max_send_fragment(SSL_CTX *ctx,
size_t max_send_fragment);
// SSL_set_max_send_fragment sets the maximum length, in bytes, of records sent
// by |ssl|. Beyond this length, handshake messages and application data will
// be split into multiple records. It returns one on success or zero on
// error.
OPENSSL_EXPORT int SSL_set_max_send_fragment(SSL *ssl,
size_t max_send_fragment);
// ssl_early_callback_ctx (aka |SSL_CLIENT_HELLO|) is passed to certain
// callbacks that are called very early on during the server handshake. At this
// point, much of the SSL* hasn't been filled out and only the ClientHello can
// be depended on.
typedef struct ssl_early_callback_ctx {
SSL *ssl;
const uint8_t *client_hello;
size_t client_hello_len;
uint16_t version;
const uint8_t *random;
size_t random_len;
const uint8_t *session_id;
size_t session_id_len;
const uint8_t *cipher_suites;
size_t cipher_suites_len;
const uint8_t *compression_methods;
size_t compression_methods_len;
const uint8_t *extensions;
size_t extensions_len;
} SSL_CLIENT_HELLO;
// ssl_select_cert_result_t enumerates the possible results from selecting a
// certificate with |select_certificate_cb|.
enum ssl_select_cert_result_t {
// ssl_select_cert_success indicates that the certificate selection was
// successful.
ssl_select_cert_success = 1,
// ssl_select_cert_retry indicates that the operation could not be
// immediately completed and must be reattempted at a later point.
ssl_select_cert_retry = 0,
// ssl_select_cert_error indicates that a fatal error occured and the
// handshake should be terminated.
ssl_select_cert_error = -1,
};
// SSL_early_callback_ctx_extension_get searches the extensions in
// |client_hello| for an extension of the given type. If not found, it returns
// zero. Otherwise it sets |out_data| to point to the extension contents (not
// including the type and length bytes), sets |out_len| to the length of the
// extension contents and returns one.
OPENSSL_EXPORT int SSL_early_callback_ctx_extension_get(
const SSL_CLIENT_HELLO *client_hello, uint16_t extension_type,
const uint8_t **out_data, size_t *out_len);
// SSL_CTX_set_select_certificate_cb sets a callback that is called before most
// ClientHello processing and before the decision whether to resume a session
// is made. The callback may inspect the ClientHello and configure the
// connection. See |ssl_select_cert_result_t| for details of the return values.
//
// In the case that a retry is indicated, |SSL_get_error| will return
// |SSL_ERROR_PENDING_CERTIFICATE| and the caller should arrange for the
// high-level operation on |ssl| to be retried at a later time, which will
// result in another call to |cb|.
//
// Note: The |SSL_CLIENT_HELLO| is only valid for the duration of the callback
// and is not valid while the handshake is paused.
OPENSSL_EXPORT void SSL_CTX_set_select_certificate_cb(
SSL_CTX *ctx,
enum ssl_select_cert_result_t (*cb)(const SSL_CLIENT_HELLO *));
// SSL_CTX_set_dos_protection_cb sets a callback that is called once the
// resumption decision for a ClientHello has been made. It can return one to
// allow the handshake to continue or zero to cause the handshake to abort.
OPENSSL_EXPORT void SSL_CTX_set_dos_protection_cb(
SSL_CTX *ctx, int (*cb)(const SSL_CLIENT_HELLO *));
// SSL_CTX_set_reverify_on_resume configures whether the certificate
// verification callback will be used to reverify stored certificates
// when resuming a session. This only works with |SSL_CTX_set_custom_verify|.
// For now, this is incompatible with |SSL_VERIFY_NONE| mode, and is only
// respected on clients.
OPENSSL_EXPORT void SSL_CTX_set_reverify_on_resume(SSL_CTX *ctx, int enabled);
// SSL_ST_* are possible values for |SSL_state|, the bitmasks that make them up,
// and some historical values for compatibility. Only |SSL_ST_INIT| and
// |SSL_ST_OK| are ever returned.
#define SSL_ST_CONNECT 0x1000
#define SSL_ST_ACCEPT 0x2000
#define SSL_ST_MASK 0x0FFF
#define SSL_ST_INIT (SSL_ST_CONNECT | SSL_ST_ACCEPT)
#define SSL_ST_OK 0x03
#define SSL_ST_RENEGOTIATE (0x04 | SSL_ST_INIT)
#define SSL_ST_BEFORE (0x05 | SSL_ST_INIT)
// TLS_ST_* are aliases for |SSL_ST_*| for OpenSSL 1.1.0 compatibility.
#define TLS_ST_OK SSL_ST_OK
#define TLS_ST_BEFORE SSL_ST_BEFORE
// SSL_CB_* are possible values for the |type| parameter in the info
// callback and the bitmasks that make them up.
#define SSL_CB_LOOP 0x01
#define SSL_CB_EXIT 0x02
#define SSL_CB_READ 0x04
#define SSL_CB_WRITE 0x08
#define SSL_CB_ALERT 0x4000
#define SSL_CB_READ_ALERT (SSL_CB_ALERT | SSL_CB_READ)
#define SSL_CB_WRITE_ALERT (SSL_CB_ALERT | SSL_CB_WRITE)
#define SSL_CB_ACCEPT_LOOP (SSL_ST_ACCEPT | SSL_CB_LOOP)
#define SSL_CB_ACCEPT_EXIT (SSL_ST_ACCEPT | SSL_CB_EXIT)
#define SSL_CB_CONNECT_LOOP (SSL_ST_CONNECT | SSL_CB_LOOP)
#define SSL_CB_CONNECT_EXIT (SSL_ST_CONNECT | SSL_CB_EXIT)
#define SSL_CB_HANDSHAKE_START 0x10
#define SSL_CB_HANDSHAKE_DONE 0x20
// SSL_CTX_set_info_callback configures a callback to be run when various
// events occur during a connection's lifetime. The |type| argument determines
// the type of event and the meaning of the |value| argument. Callbacks must
// ignore unexpected |type| values.
//
// |SSL_CB_READ_ALERT| is signaled for each alert received, warning or fatal.
// The |value| argument is a 16-bit value where the alert level (either
// |SSL3_AL_WARNING| or |SSL3_AL_FATAL|) is in the most-significant eight bits
// and the alert type (one of |SSL_AD_*|) is in the least-significant eight.
//
// |SSL_CB_WRITE_ALERT| is signaled for each alert sent. The |value| argument
// is constructed as with |SSL_CB_READ_ALERT|.
//
// |SSL_CB_HANDSHAKE_START| is signaled when a handshake begins. The |value|
// argument is always one.
//
// |SSL_CB_HANDSHAKE_DONE| is signaled when a handshake completes successfully.
// The |value| argument is always one. If a handshake False Starts, this event
// may be used to determine when the Finished message is received.
//
// The following event types expose implementation details of the handshake
// state machine. Consuming them is deprecated.
//
// |SSL_CB_ACCEPT_LOOP| (respectively, |SSL_CB_CONNECT_LOOP|) is signaled when
// a server (respectively, client) handshake progresses. The |value| argument
// is always one.
//
// |SSL_CB_ACCEPT_EXIT| (respectively, |SSL_CB_CONNECT_EXIT|) is signaled when
// a server (respectively, client) handshake completes, fails, or is paused.
// The |value| argument is one if the handshake succeeded and <= 0
// otherwise.
OPENSSL_EXPORT void SSL_CTX_set_info_callback(
SSL_CTX *ctx, void (*cb)(const SSL *ssl, int type, int value));
// SSL_CTX_get_info_callback returns the callback set by
// |SSL_CTX_set_info_callback|.
OPENSSL_EXPORT void (*SSL_CTX_get_info_callback(SSL_CTX *ctx))(const SSL *ssl,
int type,
int value);
// SSL_set_info_callback configures a callback to be run at various events
// during a connection's lifetime. See |SSL_CTX_set_info_callback|.
OPENSSL_EXPORT void SSL_set_info_callback(
SSL *ssl, void (*cb)(const SSL *ssl, int type, int value));
// SSL_get_info_callback returns the callback set by |SSL_set_info_callback|.
OPENSSL_EXPORT void (*SSL_get_info_callback(const SSL *ssl))(const SSL *ssl,
int type,
int value);
// SSL_state_string_long returns the current state of the handshake state
// machine as a string. This may be useful for debugging and logging.
OPENSSL_EXPORT const char *SSL_state_string_long(const SSL *ssl);
#define SSL_SENT_SHUTDOWN 1
#define SSL_RECEIVED_SHUTDOWN 2
// SSL_get_shutdown returns a bitmask with a subset of |SSL_SENT_SHUTDOWN| and
// |SSL_RECEIVED_SHUTDOWN| to query whether close_notify was sent or received,
// respectively.
OPENSSL_EXPORT int SSL_get_shutdown(const SSL *ssl);
// SSL_get_peer_signature_algorithm returns the signature algorithm used by the
// peer. If not applicable, it returns zero.
OPENSSL_EXPORT uint16_t SSL_get_peer_signature_algorithm(const SSL *ssl);
// SSL_get_client_random writes up to |max_out| bytes of the most recent
// handshake's client_random to |out| and returns the number of bytes written.
// If |max_out| is zero, it returns the size of the client_random.
OPENSSL_EXPORT size_t SSL_get_client_random(const SSL *ssl, uint8_t *out,
size_t max_out);
// SSL_get_server_random writes up to |max_out| bytes of the most recent
// handshake's server_random to |out| and returns the number of bytes written.
// If |max_out| is zero, it returns the size of the server_random.
OPENSSL_EXPORT size_t SSL_get_server_random(const SSL *ssl, uint8_t *out,
size_t max_out);
// SSL_get_pending_cipher returns the cipher suite for the current handshake or
// NULL if one has not been negotiated yet or there is no pending handshake.
OPENSSL_EXPORT const SSL_CIPHER *SSL_get_pending_cipher(const SSL *ssl);
// SSL_set_retain_only_sha256_of_client_certs, on a server, sets whether only
// the SHA-256 hash of peer's certificate should be saved in memory and in the
// session. This can save memory, ticket size and session cache space. If
// enabled, |SSL_get_peer_certificate| will return NULL after the handshake
// completes. See |SSL_SESSION_has_peer_sha256| and
// |SSL_SESSION_get0_peer_sha256| to query the hash.
OPENSSL_EXPORT void SSL_set_retain_only_sha256_of_client_certs(SSL *ssl,
int enable);
// SSL_CTX_set_retain_only_sha256_of_client_certs, on a server, sets whether
// only the SHA-256 hash of peer's certificate should be saved in memory and in
// the session. This can save memory, ticket size and session cache space. If
// enabled, |SSL_get_peer_certificate| will return NULL after the handshake
// completes. See |SSL_SESSION_has_peer_sha256| and
// |SSL_SESSION_get0_peer_sha256| to query the hash.
OPENSSL_EXPORT void SSL_CTX_set_retain_only_sha256_of_client_certs(SSL_CTX *ctx,
int enable);
// SSL_CTX_set_grease_enabled configures whether sockets on |ctx| should enable
// GREASE. See draft-davidben-tls-grease-01.
OPENSSL_EXPORT void SSL_CTX_set_grease_enabled(SSL_CTX *ctx, int enabled);
// SSL_max_seal_overhead returns the maximum overhead, in bytes, of sealing a
// record with |ssl|.
OPENSSL_EXPORT size_t SSL_max_seal_overhead(const SSL *ssl);
// SSL_get_ticket_age_skew returns the difference, in seconds, between the
// client-sent ticket age and the server-computed value in TLS 1.3 server
// connections which resumed a session.
OPENSSL_EXPORT int32_t SSL_get_ticket_age_skew(const SSL *ssl);
// SSL_CTX_set_false_start_allowed_without_alpn configures whether connections
// on |ctx| may use False Start (if |SSL_MODE_ENABLE_FALSE_START| is enabled)
// without negotiating ALPN.
OPENSSL_EXPORT void SSL_CTX_set_false_start_allowed_without_alpn(SSL_CTX *ctx,
int allowed);
// SSL_CTX_set_ignore_tls13_downgrade configures whether connections on |ctx|
// ignore the downgrade signal in the server's random value.
OPENSSL_EXPORT void SSL_CTX_set_ignore_tls13_downgrade(SSL_CTX *ctx,
int ignore);
// SSL_set_ignore_tls13_downgrade configures whether |ssl| ignores the downgrade
// signal in the server's random value.
OPENSSL_EXPORT void SSL_set_ignore_tls13_downgrade(SSL *ssl, int ignore);
// SSL_is_tls13_downgrade returns one if the TLS 1.3 anti-downgrade
// mechanism would have aborted |ssl|'s handshake and zero otherwise.
OPENSSL_EXPORT int SSL_is_tls13_downgrade(const SSL *ssl);
// Deprecated functions.
// SSL_library_init calls |CRYPTO_library_init| and returns one.
OPENSSL_EXPORT int SSL_library_init(void);
// SSL_CIPHER_description writes a description of |cipher| into |buf| and
// returns |buf|. If |buf| is NULL, it returns a newly allocated string, to be
// freed with |OPENSSL_free|, or NULL on error.
//
// The description includes a trailing newline and has the form:
// AES128-SHA Kx=RSA Au=RSA Enc=AES(128) Mac=SHA1
//
// Consider |SSL_CIPHER_standard_name| or |SSL_CIPHER_get_name| instead.
OPENSSL_EXPORT const char *SSL_CIPHER_description(const SSL_CIPHER *cipher,
char *buf, int len);
// SSL_CIPHER_get_version returns the string "TLSv1/SSLv3".
OPENSSL_EXPORT const char *SSL_CIPHER_get_version(const SSL_CIPHER *cipher);
// SSL_CIPHER_get_rfc_name returns a newly-allocated string containing the
// result of |SSL_CIPHER_standard_name| or NULL on error. The caller is
// responsible for calling |OPENSSL_free| on the result.
//
// Use |SSL_CIPHER_standard_name| instead.
OPENSSL_EXPORT char *SSL_CIPHER_get_rfc_name(const SSL_CIPHER *cipher);
typedef void COMP_METHOD;
typedef struct ssl_comp_st SSL_COMP;
// SSL_COMP_get_compression_methods returns NULL.
OPENSSL_EXPORT STACK_OF(SSL_COMP) *SSL_COMP_get_compression_methods(void);
// SSL_COMP_add_compression_method returns one.
OPENSSL_EXPORT int SSL_COMP_add_compression_method(int id, COMP_METHOD *cm);
// SSL_COMP_get_name returns NULL.
OPENSSL_EXPORT const char *SSL_COMP_get_name(const COMP_METHOD *comp);
// SSL_COMP_get0_name returns the |name| member of |comp|.
OPENSSL_EXPORT const char *SSL_COMP_get0_name(const SSL_COMP *comp);
// SSL_COMP_get_id returns the |id| member of |comp|.
OPENSSL_EXPORT int SSL_COMP_get_id(const SSL_COMP *comp);
// SSL_COMP_free_compression_methods does nothing.
OPENSSL_EXPORT void SSL_COMP_free_compression_methods(void);
// SSLv23_method calls |TLS_method|.
OPENSSL_EXPORT const SSL_METHOD *SSLv23_method(void);
// These version-specific methods behave exactly like |TLS_method| and
// |DTLS_method| except they also call |SSL_CTX_set_min_proto_version| and
// |SSL_CTX_set_max_proto_version| to lock connections to that protocol
// version.
OPENSSL_EXPORT const SSL_METHOD *TLSv1_method(void);
OPENSSL_EXPORT const SSL_METHOD *TLSv1_1_method(void);
OPENSSL_EXPORT const SSL_METHOD *TLSv1_2_method(void);
OPENSSL_EXPORT const SSL_METHOD *DTLSv1_method(void);
OPENSSL_EXPORT const SSL_METHOD *DTLSv1_2_method(void);
// These client- and server-specific methods call their corresponding generic
// methods.
OPENSSL_EXPORT const SSL_METHOD *TLS_server_method(void);
OPENSSL_EXPORT const SSL_METHOD *TLS_client_method(void);
OPENSSL_EXPORT const SSL_METHOD *SSLv23_server_method(void);
OPENSSL_EXPORT const SSL_METHOD *SSLv23_client_method(void);
OPENSSL_EXPORT const SSL_METHOD *TLSv1_server_method(void);
OPENSSL_EXPORT const SSL_METHOD *TLSv1_client_method(void);
OPENSSL_EXPORT const SSL_METHOD *TLSv1_1_server_method(void);
OPENSSL_EXPORT const SSL_METHOD *TLSv1_1_client_method(void);
OPENSSL_EXPORT const SSL_METHOD *TLSv1_2_server_method(void);
OPENSSL_EXPORT const SSL_METHOD *TLSv1_2_client_method(void);
OPENSSL_EXPORT const SSL_METHOD *DTLS_server_method(void);
OPENSSL_EXPORT const SSL_METHOD *DTLS_client_method(void);
OPENSSL_EXPORT const SSL_METHOD *DTLSv1_server_method(void);
OPENSSL_EXPORT const SSL_METHOD *DTLSv1_client_method(void);
OPENSSL_EXPORT const SSL_METHOD *DTLSv1_2_server_method(void);
OPENSSL_EXPORT const SSL_METHOD *DTLSv1_2_client_method(void);
// SSL_clear resets |ssl| to allow another connection and returns one on success
// or zero on failure. It returns most configuration state but releases memory
// associated with the current connection.
//
// Free |ssl| and create a new one instead.
OPENSSL_EXPORT int SSL_clear(SSL *ssl);
// SSL_CTX_set_tmp_rsa_callback does nothing.
OPENSSL_EXPORT void SSL_CTX_set_tmp_rsa_callback(
SSL_CTX *ctx, RSA *(*cb)(SSL *ssl, int is_export, int keylength));
// SSL_set_tmp_rsa_callback does nothing.
OPENSSL_EXPORT void SSL_set_tmp_rsa_callback(SSL *ssl,
RSA *(*cb)(SSL *ssl, int is_export,
int keylength));
// SSL_CTX_sess_connect returns zero.
OPENSSL_EXPORT int SSL_CTX_sess_connect(const SSL_CTX *ctx);
// SSL_CTX_sess_connect_good returns zero.
OPENSSL_EXPORT int SSL_CTX_sess_connect_good(const SSL_CTX *ctx);
// SSL_CTX_sess_connect_renegotiate returns zero.
OPENSSL_EXPORT int SSL_CTX_sess_connect_renegotiate(const SSL_CTX *ctx);
// SSL_CTX_sess_accept returns zero.
OPENSSL_EXPORT int SSL_CTX_sess_accept(const SSL_CTX *ctx);
// SSL_CTX_sess_accept_renegotiate returns zero.
OPENSSL_EXPORT int SSL_CTX_sess_accept_renegotiate(const SSL_CTX *ctx);
// SSL_CTX_sess_accept_good returns zero.
OPENSSL_EXPORT int SSL_CTX_sess_accept_good(const SSL_CTX *ctx);
// SSL_CTX_sess_hits returns zero.
OPENSSL_EXPORT int SSL_CTX_sess_hits(const SSL_CTX *ctx);
// SSL_CTX_sess_cb_hits returns zero.
OPENSSL_EXPORT int SSL_CTX_sess_cb_hits(const SSL_CTX *ctx);
// SSL_CTX_sess_misses returns zero.
OPENSSL_EXPORT int SSL_CTX_sess_misses(const SSL_CTX *ctx);
// SSL_CTX_sess_timeouts returns zero.
OPENSSL_EXPORT int SSL_CTX_sess_timeouts(const SSL_CTX *ctx);
// SSL_CTX_sess_cache_full returns zero.
OPENSSL_EXPORT int SSL_CTX_sess_cache_full(const SSL_CTX *ctx);
// SSL_cutthrough_complete calls |SSL_in_false_start|.
OPENSSL_EXPORT int SSL_cutthrough_complete(const SSL *ssl);
// SSL_num_renegotiations calls |SSL_total_renegotiations|.
OPENSSL_EXPORT int SSL_num_renegotiations(const SSL *ssl);
// SSL_CTX_need_tmp_RSA returns zero.
OPENSSL_EXPORT int SSL_CTX_need_tmp_RSA(const SSL_CTX *ctx);
// SSL_need_tmp_RSA returns zero.
OPENSSL_EXPORT int SSL_need_tmp_RSA(const SSL *ssl);
// SSL_CTX_set_tmp_rsa returns one.
OPENSSL_EXPORT int SSL_CTX_set_tmp_rsa(SSL_CTX *ctx, const RSA *rsa);
// SSL_set_tmp_rsa returns one.
OPENSSL_EXPORT int SSL_set_tmp_rsa(SSL *ssl, const RSA *rsa);
// SSL_CTX_get_read_ahead returns zero.
OPENSSL_EXPORT int SSL_CTX_get_read_ahead(const SSL_CTX *ctx);
// SSL_CTX_set_read_ahead returns one.
OPENSSL_EXPORT int SSL_CTX_set_read_ahead(SSL_CTX *ctx, int yes);
// SSL_get_read_ahead returns zero.
OPENSSL_EXPORT int SSL_get_read_ahead(const SSL *ssl);
// SSL_set_read_ahead returns one.
OPENSSL_EXPORT int SSL_set_read_ahead(SSL *ssl, int yes);
// SSL_renegotiate put an error on the error queue and returns zero.
OPENSSL_EXPORT int SSL_renegotiate(SSL *ssl);
// SSL_set_state does nothing.
OPENSSL_EXPORT void SSL_set_state(SSL *ssl, int state);
// SSL_get_shared_ciphers writes an empty string to |buf| and returns a
// pointer to |buf|, or NULL if |len| is less than or equal to zero.
OPENSSL_EXPORT char *SSL_get_shared_ciphers(const SSL *ssl, char *buf, int len);
// SSL_MODE_HANDSHAKE_CUTTHROUGH is the same as SSL_MODE_ENABLE_FALSE_START.
#define SSL_MODE_HANDSHAKE_CUTTHROUGH SSL_MODE_ENABLE_FALSE_START
// i2d_SSL_SESSION serializes |in| to the bytes pointed to by |*pp|. On success,
// it returns the number of bytes written and advances |*pp| by that many bytes.
// On failure, it returns -1. If |pp| is NULL, no bytes are written and only the
// length is returned.
//
// Use |SSL_SESSION_to_bytes| instead.
OPENSSL_EXPORT int i2d_SSL_SESSION(SSL_SESSION *in, uint8_t **pp);
// d2i_SSL_SESSION parses a serialized session from the |length| bytes pointed
// to by |*pp|. It returns the new |SSL_SESSION| and advances |*pp| by the
// number of bytes consumed on success and NULL on failure. The caller takes
// ownership of the new session and must call |SSL_SESSION_free| when done.
//
// If |a| is non-NULL, |*a| is released and set the new |SSL_SESSION|.
//
// Use |SSL_SESSION_from_bytes| instead.
OPENSSL_EXPORT SSL_SESSION *d2i_SSL_SESSION(SSL_SESSION **a, const uint8_t **pp,
long length);
// i2d_SSL_SESSION_bio serializes |session| and writes the result to |bio|. It
// returns the number of bytes written on success and <= 0 on error.
OPENSSL_EXPORT int i2d_SSL_SESSION_bio(BIO *bio, const SSL_SESSION *session);
// d2i_SSL_SESSION_bio reads a serialized |SSL_SESSION| from |bio| and returns a
// newly-allocated |SSL_SESSION| or NULL on error. If |out| is not NULL, it also
// frees |*out| and sets |*out| to the new |SSL_SESSION|.
OPENSSL_EXPORT SSL_SESSION *d2i_SSL_SESSION_bio(BIO *bio, SSL_SESSION **out);
// ERR_load_SSL_strings does nothing.
OPENSSL_EXPORT void ERR_load_SSL_strings(void);
// SSL_load_error_strings does nothing.
OPENSSL_EXPORT void SSL_load_error_strings(void);
// SSL_CTX_set_tlsext_use_srtp calls |SSL_CTX_set_srtp_profiles|. It returns
// zero on success and one on failure.
//
// WARNING: this function is dangerous because it breaks the usual return value
// convention. Use |SSL_CTX_set_srtp_profiles| instead.
OPENSSL_EXPORT int SSL_CTX_set_tlsext_use_srtp(SSL_CTX *ctx,
const char *profiles);
// SSL_set_tlsext_use_srtp calls |SSL_set_srtp_profiles|. It returns zero on
// success and one on failure.
//
// WARNING: this function is dangerous because it breaks the usual return value
// convention. Use |SSL_set_srtp_profiles| instead.
OPENSSL_EXPORT int SSL_set_tlsext_use_srtp(SSL *ssl, const char *profiles);
// SSL_get_current_compression returns NULL.
OPENSSL_EXPORT const COMP_METHOD *SSL_get_current_compression(SSL *ssl);
// SSL_get_current_expansion returns NULL.
OPENSSL_EXPORT const COMP_METHOD *SSL_get_current_expansion(SSL *ssl);
// SSL_get_server_tmp_key returns zero.
OPENSSL_EXPORT int SSL_get_server_tmp_key(SSL *ssl, EVP_PKEY **out_key);
// SSL_CTX_set_tmp_dh returns 1.
OPENSSL_EXPORT int SSL_CTX_set_tmp_dh(SSL_CTX *ctx, const DH *dh);
// SSL_set_tmp_dh returns 1.
OPENSSL_EXPORT int SSL_set_tmp_dh(SSL *ssl, const DH *dh);
// SSL_CTX_set_tmp_dh_callback does nothing.
OPENSSL_EXPORT void SSL_CTX_set_tmp_dh_callback(
SSL_CTX *ctx, DH *(*cb)(SSL *ssl, int is_export, int keylength));
// SSL_set_tmp_dh_callback does nothing.
OPENSSL_EXPORT void SSL_set_tmp_dh_callback(SSL *ssl,
DH *(*cb)(SSL *ssl, int is_export,
int keylength));
// SSL_CTX_set1_sigalgs takes |num_values| ints and interprets them as pairs
// where the first is the nid of a hash function and the second is an
// |EVP_PKEY_*| value. It configures the signature algorithm preferences for
// |ctx| based on them and returns one on success or zero on error.
//
// This API is compatible with OpenSSL. However, BoringSSL-specific code should
// prefer |SSL_CTX_set_signing_algorithm_prefs| because it's clearer and it's
// more convenient to codesearch for specific algorithm values.
OPENSSL_EXPORT int SSL_CTX_set1_sigalgs(SSL_CTX *ctx, const int *values,
size_t num_values);
// SSL_set1_sigalgs takes |num_values| ints and interprets them as pairs where
// the first is the nid of a hash function and the second is an |EVP_PKEY_*|
// value. It configures the signature algorithm preferences for |ssl| based on
// them and returns one on success or zero on error.
//
// This API is compatible with OpenSSL. However, BoringSSL-specific code should
// prefer |SSL_CTX_set_signing_algorithm_prefs| because it's clearer and it's
// more convenient to codesearch for specific algorithm values.
OPENSSL_EXPORT int SSL_set1_sigalgs(SSL *ssl, const int *values,
size_t num_values);
// SSL_CTX_set1_sigalgs_list takes a textual specification of a set of signature
// algorithms and configures them on |ctx|. It returns one on success and zero
// on error. See
// https://www.openssl.org/docs/man1.1.0/ssl/SSL_CTX_set1_sigalgs_list.html for
// a description of the text format. Also note that TLS 1.3 names (e.g.
// "rsa_pkcs1_md5_sha1") can also be used (as in OpenSSL, although OpenSSL
// doesn't document that).
//
// This API is compatible with OpenSSL. However, BoringSSL-specific code should
// prefer |SSL_CTX_set_signing_algorithm_prefs| because it's clearer and it's
// more convenient to codesearch for specific algorithm values.
OPENSSL_EXPORT int SSL_CTX_set1_sigalgs_list(SSL_CTX *ctx, const char *str);
// SSL_set1_sigalgs_list takes a textual specification of a set of signature
// algorithms and configures them on |ssl|. It returns one on success and zero
// on error. See
// https://www.openssl.org/docs/man1.1.0/ssl/SSL_CTX_set1_sigalgs_list.html for
// a description of the text format. Also note that TLS 1.3 names (e.g.
// "rsa_pkcs1_md5_sha1") can also be used (as in OpenSSL, although OpenSSL
// doesn't document that).
//
// This API is compatible with OpenSSL. However, BoringSSL-specific code should
// prefer |SSL_CTX_set_signing_algorithm_prefs| because it's clearer and it's
// more convenient to codesearch for specific algorithm values.
OPENSSL_EXPORT int SSL_set1_sigalgs_list(SSL *ssl, const char *str);
#define SSL_set_app_data(s, arg) (SSL_set_ex_data(s, 0, (char *)(arg)))
#define SSL_get_app_data(s) (SSL_get_ex_data(s, 0))
#define SSL_SESSION_set_app_data(s, a) \
(SSL_SESSION_set_ex_data(s, 0, (char *)(a)))
#define SSL_SESSION_get_app_data(s) (SSL_SESSION_get_ex_data(s, 0))
#define SSL_CTX_get_app_data(ctx) (SSL_CTX_get_ex_data(ctx, 0))
#define SSL_CTX_set_app_data(ctx, arg) \
(SSL_CTX_set_ex_data(ctx, 0, (char *)(arg)))
#define OpenSSL_add_ssl_algorithms() SSL_library_init()
#define SSLeay_add_ssl_algorithms() SSL_library_init()
#define SSL_get_cipher(ssl) SSL_CIPHER_get_name(SSL_get_current_cipher(ssl))
#define SSL_get_cipher_bits(ssl, out_alg_bits) \
SSL_CIPHER_get_bits(SSL_get_current_cipher(ssl), out_alg_bits)
#define SSL_get_cipher_version(ssl) \
SSL_CIPHER_get_version(SSL_get_current_cipher(ssl))
#define SSL_get_cipher_name(ssl) \
SSL_CIPHER_get_name(SSL_get_current_cipher(ssl))
#define SSL_get_time(session) SSL_SESSION_get_time(session)
#define SSL_set_time(session, time) SSL_SESSION_set_time((session), (time))
#define SSL_get_timeout(session) SSL_SESSION_get_timeout(session)
#define SSL_set_timeout(session, timeout) \
SSL_SESSION_set_timeout((session), (timeout))
struct ssl_comp_st {
int id;
const char *name;
char *method;
};
DEFINE_STACK_OF(SSL_COMP)
// The following flags do nothing and are included only to make it easier to
// compile code with BoringSSL.
#define SSL_MODE_AUTO_RETRY 0
#define SSL_MODE_RELEASE_BUFFERS 0
#define SSL_MODE_SEND_CLIENTHELLO_TIME 0
#define SSL_MODE_SEND_SERVERHELLO_TIME 0
#define SSL_OP_ALL 0
#define SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION 0
#define SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS 0
#define SSL_OP_EPHEMERAL_RSA 0
#define SSL_OP_LEGACY_SERVER_CONNECT 0
#define SSL_OP_MICROSOFT_BIG_SSLV3_BUFFER 0
#define SSL_OP_MICROSOFT_SESS_ID_BUG 0
#define SSL_OP_MSIE_SSLV2_RSA_PADDING 0
#define SSL_OP_NETSCAPE_CA_DN_BUG 0
#define SSL_OP_NETSCAPE_CHALLENGE_BUG 0
#define SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG 0
#define SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG 0
#define SSL_OP_NO_COMPRESSION 0
#define SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION 0
#define SSL_OP_NO_SSLv2 0
#define SSL_OP_NO_SSLv3 0
#define SSL_OP_PKCS1_CHECK_1 0
#define SSL_OP_PKCS1_CHECK_2 0
#define SSL_OP_SINGLE_DH_USE 0
#define SSL_OP_SINGLE_ECDH_USE 0
#define SSL_OP_SSLEAY_080_CLIENT_DH_BUG 0
#define SSL_OP_SSLREF2_REUSE_CERT_TYPE_BUG 0
#define SSL_OP_TLS_BLOCK_PADDING_BUG 0
#define SSL_OP_TLS_D5_BUG 0
#define SSL_OP_TLS_ROLLBACK_BUG 0
#define SSL_VERIFY_CLIENT_ONCE 0
// SSL_cache_hit calls |SSL_session_reused|.
OPENSSL_EXPORT int SSL_cache_hit(SSL *ssl);
// SSL_get_default_timeout returns |SSL_DEFAULT_SESSION_TIMEOUT|.
OPENSSL_EXPORT long SSL_get_default_timeout(const SSL *ssl);
// SSL_get_version returns a string describing the TLS version used by |ssl|.
// For example, "TLSv1.2" or "DTLSv1".
OPENSSL_EXPORT const char *SSL_get_version(const SSL *ssl);
// SSL_get_cipher_list returns the name of the |n|th cipher in the output of
// |SSL_get_ciphers| or NULL if out of range. Use |SSL_get_ciphers| instead.
OPENSSL_EXPORT const char *SSL_get_cipher_list(const SSL *ssl, int n);
// SSL_CTX_set_client_cert_cb sets a callback which is called on the client if
// the server requests a client certificate and none is configured. On success,
// the callback should return one and set |*out_x509| to |*out_pkey| to a leaf
// certificate and private key, respectively, passing ownership. It should
// return zero to send no certificate and -1 to fail or pause the handshake. If
// the handshake is paused, |SSL_get_error| will return
// |SSL_ERROR_WANT_X509_LOOKUP|.
//
// The callback may call |SSL_get0_certificate_types| and
// |SSL_get_client_CA_list| for information on the server's certificate request.
//
// Use |SSL_CTX_set_cert_cb| instead. Configuring intermediate certificates with
// this function is confusing. This callback may not be registered concurrently
// with |SSL_CTX_set_cert_cb| or |SSL_set_cert_cb|.
OPENSSL_EXPORT void SSL_CTX_set_client_cert_cb(
SSL_CTX *ctx, int (*cb)(SSL *ssl, X509 **out_x509, EVP_PKEY **out_pkey));
#define SSL_NOTHING 1
#define SSL_WRITING 2
#define SSL_READING 3
#define SSL_X509_LOOKUP 4
#define SSL_CHANNEL_ID_LOOKUP 5
#define SSL_PENDING_SESSION 7
#define SSL_CERTIFICATE_SELECTION_PENDING 8
#define SSL_PRIVATE_KEY_OPERATION 9
#define SSL_PENDING_TICKET 10
#define SSL_EARLY_DATA_REJECTED 11
#define SSL_CERTIFICATE_VERIFY 12
#define SSL_HANDOFF 13
#define SSL_HANDBACK 14
// SSL_want returns one of the above values to determine what the most recent
// operation on |ssl| was blocked on. Use |SSL_get_error| instead.
OPENSSL_EXPORT int SSL_want(const SSL *ssl);
#define SSL_want_read(ssl) (SSL_want(ssl) == SSL_READING)
#define SSL_want_write(ssl) (SSL_want(ssl) == SSL_WRITING)
// SSL_get_finished writes up to |count| bytes of the Finished message sent by
// |ssl| to |buf|. It returns the total untruncated length or zero if none has
// been sent yet. At TLS 1.3 and later, it returns zero.
//
// Use |SSL_get_tls_unique| instead.
OPENSSL_EXPORT size_t SSL_get_finished(const SSL *ssl, void *buf, size_t count);
// SSL_get_peer_finished writes up to |count| bytes of the Finished message
// received from |ssl|'s peer to |buf|. It returns the total untruncated length
// or zero if none has been received yet. At TLS 1.3 and later, it returns
// zero.
//
// Use |SSL_get_tls_unique| instead.
OPENSSL_EXPORT size_t SSL_get_peer_finished(const SSL *ssl, void *buf,
size_t count);
// SSL_alert_type_string returns "!". Use |SSL_alert_type_string_long|
// instead.
OPENSSL_EXPORT const char *SSL_alert_type_string(int value);
// SSL_alert_desc_string returns "!!". Use |SSL_alert_desc_string_long|
// instead.
OPENSSL_EXPORT const char *SSL_alert_desc_string(int value);
// SSL_state_string returns "!!!!!!". Use |SSL_state_string_long| for a more
// intelligible string.
OPENSSL_EXPORT const char *SSL_state_string(const SSL *ssl);
// SSL_TXT_* expand to strings.
#define SSL_TXT_MEDIUM "MEDIUM"
#define SSL_TXT_HIGH "HIGH"
#define SSL_TXT_FIPS "FIPS"
#define SSL_TXT_kRSA "kRSA"
#define SSL_TXT_kDHE "kDHE"
#define SSL_TXT_kEDH "kEDH"
#define SSL_TXT_kECDHE "kECDHE"
#define SSL_TXT_kEECDH "kEECDH"
#define SSL_TXT_kPSK "kPSK"
#define SSL_TXT_aRSA "aRSA"
#define SSL_TXT_aECDSA "aECDSA"
#define SSL_TXT_aPSK "aPSK"
#define SSL_TXT_DH "DH"
#define SSL_TXT_DHE "DHE"
#define SSL_TXT_EDH "EDH"
#define SSL_TXT_RSA "RSA"
#define SSL_TXT_ECDH "ECDH"
#define SSL_TXT_ECDHE "ECDHE"
#define SSL_TXT_EECDH "EECDH"
#define SSL_TXT_ECDSA "ECDSA"
#define SSL_TXT_PSK "PSK"
#define SSL_TXT_3DES "3DES"
#define SSL_TXT_RC4 "RC4"
#define SSL_TXT_AES128 "AES128"
#define SSL_TXT_AES256 "AES256"
#define SSL_TXT_AES "AES"
#define SSL_TXT_AES_GCM "AESGCM"
#define SSL_TXT_CHACHA20 "CHACHA20"
#define SSL_TXT_MD5 "MD5"
#define SSL_TXT_SHA1 "SHA1"
#define SSL_TXT_SHA "SHA"
#define SSL_TXT_SHA256 "SHA256"
#define SSL_TXT_SHA384 "SHA384"
#define SSL_TXT_SSLV3 "SSLv3"
#define SSL_TXT_TLSV1 "TLSv1"
#define SSL_TXT_TLSV1_1 "TLSv1.1"
#define SSL_TXT_TLSV1_2 "TLSv1.2"
#define SSL_TXT_TLSV1_3 "TLSv1.3"
#define SSL_TXT_ALL "ALL"
#define SSL_TXT_CMPDEF "COMPLEMENTOFDEFAULT"
typedef struct ssl_conf_ctx_st SSL_CONF_CTX;
// SSL_state returns |SSL_ST_INIT| if a handshake is in progress and |SSL_ST_OK|
// otherwise.
//
// Use |SSL_is_init| instead.
OPENSSL_EXPORT int SSL_state(const SSL *ssl);
#define SSL_get_state(ssl) SSL_state(ssl)
// SSL_set_shutdown causes |ssl| to behave as if the shutdown bitmask (see
// |SSL_get_shutdown|) were |mode|. This may be used to skip sending or
// receiving close_notify in |SSL_shutdown| by causing the implementation to
// believe the events already happened.
//
// It is an error to use |SSL_set_shutdown| to unset a bit that has already been
// set. Doing so will trigger an |assert| in debug builds and otherwise be
// ignored.
//
// Use |SSL_CTX_set_quiet_shutdown| instead.
OPENSSL_EXPORT void SSL_set_shutdown(SSL *ssl, int mode);
// SSL_CTX_set_tmp_ecdh calls |SSL_CTX_set1_curves| with a one-element list
// containing |ec_key|'s curve.
OPENSSL_EXPORT int SSL_CTX_set_tmp_ecdh(SSL_CTX *ctx, const EC_KEY *ec_key);
// SSL_set_tmp_ecdh calls |SSL_set1_curves| with a one-element list containing
// |ec_key|'s curve.
OPENSSL_EXPORT int SSL_set_tmp_ecdh(SSL *ssl, const EC_KEY *ec_key);
// SSL_add_dir_cert_subjects_to_stack lists files in directory |dir|. It calls
// |SSL_add_file_cert_subjects_to_stack| on each file and returns one on success
// or zero on error. This function is only available from the libdecrepit
// library.
OPENSSL_EXPORT int SSL_add_dir_cert_subjects_to_stack(STACK_OF(X509_NAME) *out,
const char *dir);
// SSL_set_verify_result calls |abort| unless |result| is |X509_V_OK|.
//
// TODO(davidben): Remove this function once it has been removed from
// netty-tcnative.
OPENSSL_EXPORT void SSL_set_verify_result(SSL *ssl, long result);
// SSL_CTX_enable_tls_channel_id calls |SSL_CTX_set_tls_channel_id_enabled|.
OPENSSL_EXPORT int SSL_CTX_enable_tls_channel_id(SSL_CTX *ctx);
// SSL_enable_tls_channel_id calls |SSL_set_tls_channel_id_enabled|.
OPENSSL_EXPORT int SSL_enable_tls_channel_id(SSL *ssl);
// BIO_f_ssl returns a |BIO_METHOD| that can wrap an |SSL*| in a |BIO*|. Note
// that this has quite different behaviour from the version in OpenSSL (notably
// that it doesn't try to auto renegotiate).
//
// IMPORTANT: if you are not curl, don't use this.
OPENSSL_EXPORT const BIO_METHOD *BIO_f_ssl(void);
// BIO_set_ssl sets |ssl| as the underlying connection for |bio|, which must
// have been created using |BIO_f_ssl|. If |take_owership| is true, |bio| will
// call |SSL_free| on |ssl| when closed. It returns one on success or something
// other than one on error.
OPENSSL_EXPORT long BIO_set_ssl(BIO *bio, SSL *ssl, int take_owership);
// SSL_CTX_set_ecdh_auto returns one.
#define SSL_CTX_set_ecdh_auto(ctx, onoff) 1
// SSL_set_ecdh_auto returns one.
#define SSL_set_ecdh_auto(ssl, onoff) 1
// SSL_get_session returns a non-owning pointer to |ssl|'s session. For
// historical reasons, which session it returns depends on |ssl|'s state.
//
// Prior to the start of the initial handshake, it returns the session the
// caller set with |SSL_set_session|. After the initial handshake has finished
// and if no additional handshakes are in progress, it returns the currently
// active session. Its behavior is undefined while a handshake is in progress.
//
// If trying to add new sessions to an external session cache, use
// |SSL_CTX_sess_set_new_cb| instead. In particular, using the callback is
// required as of TLS 1.3. For compatibility, this function will return an
// unresumable session which may be cached, but will never be resumed.
//
// If querying properties of the connection, use APIs on the |SSL| object.
OPENSSL_EXPORT SSL_SESSION *SSL_get_session(const SSL *ssl);
// SSL_get0_session is an alias for |SSL_get_session|.
#define SSL_get0_session SSL_get_session
// SSL_get1_session acts like |SSL_get_session| but returns a new reference to
// the session.
OPENSSL_EXPORT SSL_SESSION *SSL_get1_session(SSL *ssl);
#define OPENSSL_INIT_NO_LOAD_SSL_STRINGS 0
#define OPENSSL_INIT_LOAD_SSL_STRINGS 0
#define OPENSSL_INIT_SSL_DEFAULT 0
// OPENSSL_init_ssl calls |CRYPTO_library_init| and returns one.
OPENSSL_EXPORT int OPENSSL_init_ssl(uint64_t opts,
const OPENSSL_INIT_SETTINGS *settings);
// The following constants are legacy aliases for RSA-PSS with rsaEncryption
// keys. Use the new names instead.
#define SSL_SIGN_RSA_PSS_SHA256 SSL_SIGN_RSA_PSS_RSAE_SHA256
#define SSL_SIGN_RSA_PSS_SHA384 SSL_SIGN_RSA_PSS_RSAE_SHA384
#define SSL_SIGN_RSA_PSS_SHA512 SSL_SIGN_RSA_PSS_RSAE_SHA512
// SSL_set_tlsext_status_type configures a client to request OCSP stapling if
// |type| is |TLSEXT_STATUSTYPE_ocsp| and disables it otherwise. It returns one
// on success and zero if handshake configuration has already been shed.
//
// Use |SSL_enable_ocsp_stapling| instead.
OPENSSL_EXPORT int SSL_set_tlsext_status_type(SSL *ssl, int type);
// SSL_get_tlsext_status_type returns |TLSEXT_STATUSTYPE_ocsp| if the client
// requested OCSP stapling and |TLSEXT_STATUSTYPE_nothing| otherwise. On the
// client, this reflects whether OCSP stapling was enabled via, e.g.,
// |SSL_set_tlsext_status_type|. On the server, this is determined during the
// handshake. It may be queried in callbacks set by |SSL_CTX_set_cert_cb|. The
// result is undefined after the handshake completes.
OPENSSL_EXPORT int SSL_get_tlsext_status_type(const SSL *ssl);
// SSL_set_tlsext_status_ocsp_resp sets the OCSP response. It returns one on
// success and zero on error. On success, |ssl| takes ownership of |resp|, which
// must have been allocated by |OPENSSL_malloc|.
//
// Use |SSL_set_ocsp_response| instead.
OPENSSL_EXPORT int SSL_set_tlsext_status_ocsp_resp(SSL *ssl, uint8_t *resp,
size_t resp_len);
// SSL_get_tlsext_status_ocsp_resp sets |*out| to point to the OCSP response
// from the server. It returns the length of the response. If there was no
// response, it sets |*out| to NULL and returns zero.
//
// Use |SSL_get0_ocsp_response| instead.
//
// WARNING: the returned data is not guaranteed to be well formed.
OPENSSL_EXPORT size_t SSL_get_tlsext_status_ocsp_resp(const SSL *ssl,
const uint8_t **out);
// SSL_CTX_set_tlsext_status_cb configures the legacy OpenSSL OCSP callback and
// returns one. Though the type signature is the same, this callback has
// different behavior for client and server connections:
//
// For clients, the callback is called after certificate verification. It should
// return one for success, zero for a bad OCSP response, and a negative number
// for internal error. Instead, handle this as part of certificate verification.
// (Historically, OpenSSL verified certificates just before parsing stapled OCSP
// responses, but BoringSSL fixes this ordering. All server credentials are
// available during verification.)
//
// Do not use this callback as a server. It is provided for compatibility
// purposes only. For servers, it is called to configure server credentials. It
// should return |SSL_TLSEXT_ERR_OK| on success, |SSL_TLSEXT_ERR_NOACK| to
// ignore OCSP requests, or |SSL_TLSEXT_ERR_ALERT_FATAL| on error. It is usually
// used to fetch OCSP responses on demand, which is not ideal. Instead, treat
// OCSP responses like other server credentials, such as certificates or SCT
// lists. Configure, store, and refresh them eagerly. This avoids downtime if
// the CA's OCSP responder is briefly offline.
OPENSSL_EXPORT int SSL_CTX_set_tlsext_status_cb(SSL_CTX *ctx,
int (*callback)(SSL *ssl,
void *arg));
// SSL_CTX_set_tlsext_status_arg sets additional data for
// |SSL_CTX_set_tlsext_status_cb|'s callback and returns one.
OPENSSL_EXPORT int SSL_CTX_set_tlsext_status_arg(SSL_CTX *ctx, void *arg);
// Nodejs compatibility section (hidden).
//
// These defines exist for node.js, with the hope that we can eliminate the
// need for them over time.
#define SSLerr(function, reason) \
ERR_put_error(ERR_LIB_SSL, 0, reason, __FILE__, __LINE__)
// Preprocessor compatibility section (hidden).
//
// Historically, a number of APIs were implemented in OpenSSL as macros and
// constants to 'ctrl' functions. To avoid breaking #ifdefs in consumers, this
// section defines a number of legacy macros.
//
// Although using either the CTRL values or their wrapper macros in #ifdefs is
// still supported, the CTRL values may not be passed to |SSL_ctrl| and
// |SSL_CTX_ctrl|. Call the functions (previously wrapper macros) instead.
//
// See PORTING.md in the BoringSSL source tree for a table of corresponding
// functions.
// https://boringssl.googlesource.com/boringssl/+/master/PORTING.md#Replacements-for-values
#define DTLS_CTRL_GET_TIMEOUT doesnt_exist
#define DTLS_CTRL_HANDLE_TIMEOUT doesnt_exist
#define SSL_CTRL_CHAIN doesnt_exist
#define SSL_CTRL_CHAIN_CERT doesnt_exist
#define SSL_CTRL_CHANNEL_ID doesnt_exist
#define SSL_CTRL_CLEAR_EXTRA_CHAIN_CERTS doesnt_exist
#define SSL_CTRL_CLEAR_MODE doesnt_exist
#define SSL_CTRL_CLEAR_OPTIONS doesnt_exist
#define SSL_CTRL_EXTRA_CHAIN_CERT doesnt_exist
#define SSL_CTRL_GET_CHAIN_CERTS doesnt_exist
#define SSL_CTRL_GET_CHANNEL_ID doesnt_exist
#define SSL_CTRL_GET_CLIENT_CERT_TYPES doesnt_exist
#define SSL_CTRL_GET_EXTRA_CHAIN_CERTS doesnt_exist
#define SSL_CTRL_GET_MAX_CERT_LIST doesnt_exist
#define SSL_CTRL_GET_NUM_RENEGOTIATIONS doesnt_exist
#define SSL_CTRL_GET_READ_AHEAD doesnt_exist
#define SSL_CTRL_GET_RI_SUPPORT doesnt_exist
#define SSL_CTRL_GET_SERVER_TMP_KEY doesnt_exist
#define SSL_CTRL_GET_SESSION_REUSED doesnt_exist
#define SSL_CTRL_GET_SESS_CACHE_MODE doesnt_exist
#define SSL_CTRL_GET_SESS_CACHE_SIZE doesnt_exist
#define SSL_CTRL_GET_TLSEXT_TICKET_KEYS doesnt_exist
#define SSL_CTRL_GET_TOTAL_RENEGOTIATIONS doesnt_exist
#define SSL_CTRL_MODE doesnt_exist
#define SSL_CTRL_NEED_TMP_RSA doesnt_exist
#define SSL_CTRL_OPTIONS doesnt_exist
#define SSL_CTRL_SESS_NUMBER doesnt_exist
#define SSL_CTRL_SET_CURVES doesnt_exist
#define SSL_CTRL_SET_CURVES_LIST doesnt_exist
#define SSL_CTRL_SET_ECDH_AUTO doesnt_exist
#define SSL_CTRL_SET_MAX_CERT_LIST doesnt_exist
#define SSL_CTRL_SET_MAX_SEND_FRAGMENT doesnt_exist
#define SSL_CTRL_SET_MSG_CALLBACK doesnt_exist
#define SSL_CTRL_SET_MSG_CALLBACK_ARG doesnt_exist
#define SSL_CTRL_SET_MTU doesnt_exist
#define SSL_CTRL_SET_READ_AHEAD doesnt_exist
#define SSL_CTRL_SET_SESS_CACHE_MODE doesnt_exist
#define SSL_CTRL_SET_SESS_CACHE_SIZE doesnt_exist
#define SSL_CTRL_SET_TLSEXT_HOSTNAME doesnt_exist
#define SSL_CTRL_SET_TLSEXT_SERVERNAME_ARG doesnt_exist
#define SSL_CTRL_SET_TLSEXT_SERVERNAME_CB doesnt_exist
#define SSL_CTRL_SET_TLSEXT_TICKET_KEYS doesnt_exist
#define SSL_CTRL_SET_TLSEXT_TICKET_KEY_CB doesnt_exist
#define SSL_CTRL_SET_TMP_DH doesnt_exist
#define SSL_CTRL_SET_TMP_DH_CB doesnt_exist
#define SSL_CTRL_SET_TMP_ECDH doesnt_exist
#define SSL_CTRL_SET_TMP_ECDH_CB doesnt_exist
#define SSL_CTRL_SET_TMP_RSA doesnt_exist
#define SSL_CTRL_SET_TMP_RSA_CB doesnt_exist
// |BORINGSSL_PREFIX| already makes each of these symbols into macros, so there
// is no need to define conflicting macros.
#if !defined(BORINGSSL_PREFIX)
#define DTLSv1_get_timeout DTLSv1_get_timeout
#define DTLSv1_handle_timeout DTLSv1_handle_timeout
#define SSL_CTX_add0_chain_cert SSL_CTX_add0_chain_cert
#define SSL_CTX_add1_chain_cert SSL_CTX_add1_chain_cert
#define SSL_CTX_add_extra_chain_cert SSL_CTX_add_extra_chain_cert
#define SSL_CTX_clear_extra_chain_certs SSL_CTX_clear_extra_chain_certs
#define SSL_CTX_clear_chain_certs SSL_CTX_clear_chain_certs
#define SSL_CTX_clear_mode SSL_CTX_clear_mode
#define SSL_CTX_clear_options SSL_CTX_clear_options
#define SSL_CTX_get0_chain_certs SSL_CTX_get0_chain_certs
#define SSL_CTX_get_extra_chain_certs SSL_CTX_get_extra_chain_certs
#define SSL_CTX_get_max_cert_list SSL_CTX_get_max_cert_list
#define SSL_CTX_get_mode SSL_CTX_get_mode
#define SSL_CTX_get_options SSL_CTX_get_options
#define SSL_CTX_get_read_ahead SSL_CTX_get_read_ahead
#define SSL_CTX_get_session_cache_mode SSL_CTX_get_session_cache_mode
#define SSL_CTX_get_tlsext_ticket_keys SSL_CTX_get_tlsext_ticket_keys
#define SSL_CTX_need_tmp_RSA SSL_CTX_need_tmp_RSA
#define SSL_CTX_sess_get_cache_size SSL_CTX_sess_get_cache_size
#define SSL_CTX_sess_number SSL_CTX_sess_number
#define SSL_CTX_sess_set_cache_size SSL_CTX_sess_set_cache_size
#define SSL_CTX_set0_chain SSL_CTX_set0_chain
#define SSL_CTX_set1_chain SSL_CTX_set1_chain
#define SSL_CTX_set1_curves SSL_CTX_set1_curves
#define SSL_CTX_set_max_cert_list SSL_CTX_set_max_cert_list
#define SSL_CTX_set_max_send_fragment SSL_CTX_set_max_send_fragment
#define SSL_CTX_set_mode SSL_CTX_set_mode
#define SSL_CTX_set_msg_callback_arg SSL_CTX_set_msg_callback_arg
#define SSL_CTX_set_options SSL_CTX_set_options
#define SSL_CTX_set_read_ahead SSL_CTX_set_read_ahead
#define SSL_CTX_set_session_cache_mode SSL_CTX_set_session_cache_mode
#define SSL_CTX_set_tlsext_servername_arg SSL_CTX_set_tlsext_servername_arg
#define SSL_CTX_set_tlsext_servername_callback \
SSL_CTX_set_tlsext_servername_callback
#define SSL_CTX_set_tlsext_ticket_key_cb SSL_CTX_set_tlsext_ticket_key_cb
#define SSL_CTX_set_tlsext_ticket_keys SSL_CTX_set_tlsext_ticket_keys
#define SSL_CTX_set_tmp_dh SSL_CTX_set_tmp_dh
#define SSL_CTX_set_tmp_ecdh SSL_CTX_set_tmp_ecdh
#define SSL_CTX_set_tmp_rsa SSL_CTX_set_tmp_rsa
#define SSL_add0_chain_cert SSL_add0_chain_cert
#define SSL_add1_chain_cert SSL_add1_chain_cert
#define SSL_clear_chain_certs SSL_clear_chain_certs
#define SSL_clear_mode SSL_clear_mode
#define SSL_clear_options SSL_clear_options
#define SSL_get0_certificate_types SSL_get0_certificate_types
#define SSL_get0_chain_certs SSL_get0_chain_certs
#define SSL_get_max_cert_list SSL_get_max_cert_list
#define SSL_get_mode SSL_get_mode
#define SSL_get_options SSL_get_options
#define SSL_get_secure_renegotiation_support \
SSL_get_secure_renegotiation_support
#define SSL_need_tmp_RSA SSL_need_tmp_RSA
#define SSL_num_renegotiations SSL_num_renegotiations
#define SSL_session_reused SSL_session_reused
#define SSL_set0_chain SSL_set0_chain
#define SSL_set1_chain SSL_set1_chain
#define SSL_set1_curves SSL_set1_curves
#define SSL_set_max_cert_list SSL_set_max_cert_list
#define SSL_set_max_send_fragment SSL_set_max_send_fragment
#define SSL_set_mode SSL_set_mode
#define SSL_set_msg_callback_arg SSL_set_msg_callback_arg
#define SSL_set_mtu SSL_set_mtu
#define SSL_set_options SSL_set_options
#define SSL_set_tlsext_host_name SSL_set_tlsext_host_name
#define SSL_set_tmp_dh SSL_set_tmp_dh
#define SSL_set_tmp_ecdh SSL_set_tmp_ecdh
#define SSL_set_tmp_rsa SSL_set_tmp_rsa
#define SSL_total_renegotiations SSL_total_renegotiations
#endif // !defined(BORINGSSL_PREFIX)
#if defined(__cplusplus)
} // extern C
#if !defined(BORINGSSL_NO_CXX)
extern "C++" {
BSSL_NAMESPACE_BEGIN
BORINGSSL_MAKE_DELETER(SSL, SSL_free)
BORINGSSL_MAKE_DELETER(SSL_CTX, SSL_CTX_free)
BORINGSSL_MAKE_UP_REF(SSL_CTX, SSL_CTX_up_ref)
BORINGSSL_MAKE_DELETER(SSL_SESSION, SSL_SESSION_free)
BORINGSSL_MAKE_UP_REF(SSL_SESSION, SSL_SESSION_up_ref)
enum class OpenRecordResult {
kOK,
kDiscard,
kIncompleteRecord,
kAlertCloseNotify,
kError,
};
// *** EXPERIMENTAL -- DO NOT USE ***
//
// OpenRecord decrypts the first complete SSL record from |in| in-place, sets
// |out| to the decrypted application data, and |out_record_len| to the length
// of the encrypted record. Returns:
// - kOK if an application-data record was successfully decrypted and verified.
// - kDiscard if a record was sucessfully processed, but should be discarded.
// - kIncompleteRecord if |in| did not contain a complete record.
// - kAlertCloseNotify if a record was successfully processed but is a
// close_notify alert.
// - kError if an error occurred or the record is invalid. |*out_alert| will be
// set to an alert to emit, or zero if no alert should be emitted.
OPENSSL_EXPORT OpenRecordResult OpenRecord(SSL *ssl, Span<uint8_t> *out,
size_t *out_record_len,
uint8_t *out_alert,
Span<uint8_t> in);
OPENSSL_EXPORT size_t SealRecordPrefixLen(const SSL *ssl, size_t plaintext_len);
// SealRecordSuffixLen returns the length of the suffix written by |SealRecord|.
//
// |plaintext_len| must be equal to the size of the plaintext passed to
// |SealRecord|.
//
// |plaintext_len| must not exceed |SSL3_RT_MAX_PLAINTEXT_LENGTH|. The returned
// suffix length will not exceed |SSL3_RT_MAX_ENCRYPTED_OVERHEAD|.
OPENSSL_EXPORT size_t SealRecordSuffixLen(const SSL *ssl, size_t plaintext_len);
// *** EXPERIMENTAL -- DO NOT USE ***
//
// SealRecord encrypts the cleartext of |in| and scatters the resulting TLS
// application data record between |out_prefix|, |out|, and |out_suffix|. It
// returns true on success or false if an error occurred.
//
// The length of |out_prefix| must equal |SealRecordPrefixLen|. The length of
// |out| must equal the length of |in|, which must not exceed
// |SSL3_RT_MAX_PLAINTEXT_LENGTH|. The length of |out_suffix| must equal
// |SealRecordSuffixLen|.
//
// If enabled, |SealRecord| may perform TLS 1.0 CBC 1/n-1 record splitting.
// |SealRecordPrefixLen| accounts for the required overhead if that is the case.
//
// |out| may equal |in| to encrypt in-place but may not otherwise alias.
// |out_prefix| and |out_suffix| may not alias anything.
OPENSSL_EXPORT bool SealRecord(SSL *ssl, Span<uint8_t> out_prefix,
Span<uint8_t> out, Span<uint8_t> out_suffix,
Span<const uint8_t> in);
// *** EXPERIMENTAL — DO NOT USE WITHOUT CHECKING ***
//
// Split handshakes.
//
// Split handshakes allows the handshake part of a TLS connection to be
// performed in a different process (or on a different machine) than the data
// exchange. This only applies to servers.
//
// In the first part of a split handshake, an |SSL| (where the |SSL_CTX| has
// been configured with |SSL_CTX_set_handoff_mode|) is used normally. Once the
// ClientHello message has been received, the handshake will stop and
// |SSL_get_error| will indicate |SSL_ERROR_HANDOFF|. At this point (and only
// at this point), |SSL_serialize_handoff| can be called to write the “handoff”
// state of the connection.
//
// Elsewhere, a fresh |SSL| can be used with |SSL_apply_handoff| to continue
// the connection. The connection from the client is fed into this |SSL|, and
// the handshake resumed. When the handshake stops again and |SSL_get_error|
// indicates |SSL_ERROR_HANDBACK|, |SSL_serialize_handback| should be called to
// serialize the state of the handshake again.
//
// Back at the first location, a fresh |SSL| can be used with
// |SSL_apply_handback|. Then the client's connection can be processed mostly
// as normal.
//
// Lastly, when a connection is in the handoff state, whether or not
// |SSL_serialize_handoff| is called, |SSL_decline_handoff| will move it back
// into a normal state where the connection can proceed without impact.
//
// WARNING: Currently only works with TLS 1.0–1.2.
// WARNING: The serialisation formats are not yet stable: version skew may be
// fatal.
// WARNING: The handback data contains sensitive key material and must be
// protected.
// WARNING: Some calls on the final |SSL| will not work. Just as an example,
// calls like |SSL_get0_session_id_context| and |SSL_get_privatekey| won't
// work because the certificate used for handshaking isn't available.
// WARNING: |SSL_apply_handoff| may trigger “msg” callback calls.
OPENSSL_EXPORT void SSL_CTX_set_handoff_mode(SSL_CTX *ctx, bool on);
OPENSSL_EXPORT void SSL_set_handoff_mode(SSL *SSL, bool on);
OPENSSL_EXPORT bool SSL_serialize_handoff(const SSL *ssl, CBB *out);
OPENSSL_EXPORT bool SSL_decline_handoff(SSL *ssl);
OPENSSL_EXPORT bool SSL_apply_handoff(SSL *ssl, Span<const uint8_t> handoff);
OPENSSL_EXPORT bool SSL_serialize_handback(const SSL *ssl, CBB *out);
OPENSSL_EXPORT bool SSL_apply_handback(SSL *ssl, Span<const uint8_t> handback);
BSSL_NAMESPACE_END
} // extern C++
#endif // !defined(BORINGSSL_NO_CXX)
#endif
#define SSL_R_APP_DATA_IN_HANDSHAKE 100
#define SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT 101
#define SSL_R_BAD_ALERT 102
#define SSL_R_BAD_CHANGE_CIPHER_SPEC 103
#define SSL_R_BAD_DATA_RETURNED_BY_CALLBACK 104
#define SSL_R_BAD_DH_P_LENGTH 105
#define SSL_R_BAD_DIGEST_LENGTH 106
#define SSL_R_BAD_ECC_CERT 107
#define SSL_R_BAD_ECPOINT 108
#define SSL_R_BAD_HANDSHAKE_RECORD 109
#define SSL_R_BAD_HELLO_REQUEST 110
#define SSL_R_BAD_LENGTH 111
#define SSL_R_BAD_PACKET_LENGTH 112
#define SSL_R_BAD_RSA_ENCRYPT 113
#define SSL_R_BAD_SIGNATURE 114
#define SSL_R_BAD_SRTP_MKI_VALUE 115
#define SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST 116
#define SSL_R_BAD_SSL_FILETYPE 117
#define SSL_R_BAD_WRITE_RETRY 118
#define SSL_R_BIO_NOT_SET 119
#define SSL_R_BN_LIB 120
#define SSL_R_BUFFER_TOO_SMALL 121
#define SSL_R_CA_DN_LENGTH_MISMATCH 122
#define SSL_R_CA_DN_TOO_LONG 123
#define SSL_R_CCS_RECEIVED_EARLY 124
#define SSL_R_CERTIFICATE_VERIFY_FAILED 125
#define SSL_R_CERT_CB_ERROR 126
#define SSL_R_CERT_LENGTH_MISMATCH 127
#define SSL_R_CHANNEL_ID_NOT_P256 128
#define SSL_R_CHANNEL_ID_SIGNATURE_INVALID 129
#define SSL_R_CIPHER_OR_HASH_UNAVAILABLE 130
#define SSL_R_CLIENTHELLO_PARSE_FAILED 131
#define SSL_R_CLIENTHELLO_TLSEXT 132
#define SSL_R_CONNECTION_REJECTED 133
#define SSL_R_CONNECTION_TYPE_NOT_SET 134
#define SSL_R_CUSTOM_EXTENSION_ERROR 135
#define SSL_R_DATA_LENGTH_TOO_LONG 136
#define SSL_R_DECODE_ERROR 137
#define SSL_R_DECRYPTION_FAILED 138
#define SSL_R_DECRYPTION_FAILED_OR_BAD_RECORD_MAC 139
#define SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG 140
#define SSL_R_DH_P_TOO_LONG 141
#define SSL_R_DIGEST_CHECK_FAILED 142
#define SSL_R_DTLS_MESSAGE_TOO_BIG 143
#define SSL_R_ECC_CERT_NOT_FOR_SIGNING 144
#define SSL_R_EMS_STATE_INCONSISTENT 145
#define SSL_R_ENCRYPTED_LENGTH_TOO_LONG 146
#define SSL_R_ERROR_ADDING_EXTENSION 147
#define SSL_R_ERROR_IN_RECEIVED_CIPHER_LIST 148
#define SSL_R_ERROR_PARSING_EXTENSION 149
#define SSL_R_EXCESSIVE_MESSAGE_SIZE 150
#define SSL_R_EXTRA_DATA_IN_MESSAGE 151
#define SSL_R_FRAGMENT_MISMATCH 152
#define SSL_R_GOT_NEXT_PROTO_WITHOUT_EXTENSION 153
#define SSL_R_HANDSHAKE_FAILURE_ON_CLIENT_HELLO 154
#define SSL_R_HTTPS_PROXY_REQUEST 155
#define SSL_R_HTTP_REQUEST 156
#define SSL_R_INAPPROPRIATE_FALLBACK 157
#define SSL_R_INVALID_COMMAND 158
#define SSL_R_INVALID_MESSAGE 159
#define SSL_R_INVALID_SSL_SESSION 160
#define SSL_R_INVALID_TICKET_KEYS_LENGTH 161
#define SSL_R_LENGTH_MISMATCH 162
#define SSL_R_MISSING_EXTENSION 164
#define SSL_R_MISSING_RSA_CERTIFICATE 165
#define SSL_R_MISSING_TMP_DH_KEY 166
#define SSL_R_MISSING_TMP_ECDH_KEY 167
#define SSL_R_MIXED_SPECIAL_OPERATOR_WITH_GROUPS 168
#define SSL_R_MTU_TOO_SMALL 169
#define SSL_R_NEGOTIATED_BOTH_NPN_AND_ALPN 170
#define SSL_R_NESTED_GROUP 171
#define SSL_R_NO_CERTIFICATES_RETURNED 172
#define SSL_R_NO_CERTIFICATE_ASSIGNED 173
#define SSL_R_NO_CERTIFICATE_SET 174
#define SSL_R_NO_CIPHERS_AVAILABLE 175
#define SSL_R_NO_CIPHERS_PASSED 176
#define SSL_R_NO_CIPHER_MATCH 177
#define SSL_R_NO_COMPRESSION_SPECIFIED 178
#define SSL_R_NO_METHOD_SPECIFIED 179
#define SSL_R_NO_P256_SUPPORT 180
#define SSL_R_NO_PRIVATE_KEY_ASSIGNED 181
#define SSL_R_NO_RENEGOTIATION 182
#define SSL_R_NO_REQUIRED_DIGEST 183
#define SSL_R_NO_SHARED_CIPHER 184
#define SSL_R_NULL_SSL_CTX 185
#define SSL_R_NULL_SSL_METHOD_PASSED 186
#define SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED 187
#define SSL_R_OLD_SESSION_VERSION_NOT_RETURNED 188
#define SSL_R_OUTPUT_ALIASES_INPUT 189
#define SSL_R_PARSE_TLSEXT 190
#define SSL_R_PATH_TOO_LONG 191
#define SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE 192
#define SSL_R_PEER_ERROR_UNSUPPORTED_CERTIFICATE_TYPE 193
#define SSL_R_PROTOCOL_IS_SHUTDOWN 194
#define SSL_R_PSK_IDENTITY_NOT_FOUND 195
#define SSL_R_PSK_NO_CLIENT_CB 196
#define SSL_R_PSK_NO_SERVER_CB 197
#define SSL_R_READ_TIMEOUT_EXPIRED 198
#define SSL_R_RECORD_LENGTH_MISMATCH 199
#define SSL_R_RECORD_TOO_LARGE 200
#define SSL_R_RENEGOTIATION_ENCODING_ERR 201
#define SSL_R_RENEGOTIATION_MISMATCH 202
#define SSL_R_REQUIRED_CIPHER_MISSING 203
#define SSL_R_RESUMED_EMS_SESSION_WITHOUT_EMS_EXTENSION 204
#define SSL_R_RESUMED_NON_EMS_SESSION_WITH_EMS_EXTENSION 205
#define SSL_R_SCSV_RECEIVED_WHEN_RENEGOTIATING 206
#define SSL_R_SERVERHELLO_TLSEXT 207
#define SSL_R_SESSION_ID_CONTEXT_UNINITIALIZED 208
#define SSL_R_SESSION_MAY_NOT_BE_CREATED 209
#define SSL_R_SIGNATURE_ALGORITHMS_EXTENSION_SENT_BY_SERVER 210
#define SSL_R_SRTP_COULD_NOT_ALLOCATE_PROFILES 211
#define SSL_R_SRTP_UNKNOWN_PROTECTION_PROFILE 212
#define SSL_R_SSL3_EXT_INVALID_SERVERNAME 213
#define SSL_R_SSL_CTX_HAS_NO_DEFAULT_SSL_VERSION 214
#define SSL_R_SSL_HANDSHAKE_FAILURE 215
#define SSL_R_SSL_SESSION_ID_CONTEXT_TOO_LONG 216
#define SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST 217
#define SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG 218
#define SSL_R_TOO_MANY_EMPTY_FRAGMENTS 219
#define SSL_R_TOO_MANY_WARNING_ALERTS 220
#define SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS 221
#define SSL_R_UNEXPECTED_EXTENSION 222
#define SSL_R_UNEXPECTED_MESSAGE 223
#define SSL_R_UNEXPECTED_OPERATOR_IN_GROUP 224
#define SSL_R_UNEXPECTED_RECORD 225
#define SSL_R_UNINITIALIZED 226
#define SSL_R_UNKNOWN_ALERT_TYPE 227
#define SSL_R_UNKNOWN_CERTIFICATE_TYPE 228
#define SSL_R_UNKNOWN_CIPHER_RETURNED 229
#define SSL_R_UNKNOWN_CIPHER_TYPE 230
#define SSL_R_UNKNOWN_DIGEST 231
#define SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE 232
#define SSL_R_UNKNOWN_PROTOCOL 233
#define SSL_R_UNKNOWN_SSL_VERSION 234
#define SSL_R_UNKNOWN_STATE 235
#define SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED 236
#define SSL_R_UNSUPPORTED_CIPHER 237
#define SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM 238
#define SSL_R_UNSUPPORTED_ELLIPTIC_CURVE 239
#define SSL_R_UNSUPPORTED_PROTOCOL 240
#define SSL_R_WRONG_CERTIFICATE_TYPE 241
#define SSL_R_WRONG_CIPHER_RETURNED 242
#define SSL_R_WRONG_CURVE 243
#define SSL_R_WRONG_MESSAGE_TYPE 244
#define SSL_R_WRONG_SIGNATURE_TYPE 245
#define SSL_R_WRONG_SSL_VERSION 246
#define SSL_R_WRONG_VERSION_NUMBER 247
#define SSL_R_X509_LIB 248
#define SSL_R_X509_VERIFICATION_SETUP_PROBLEMS 249
#define SSL_R_SHUTDOWN_WHILE_IN_INIT 250
#define SSL_R_INVALID_OUTER_RECORD_TYPE 251
#define SSL_R_UNSUPPORTED_PROTOCOL_FOR_CUSTOM_KEY 252
#define SSL_R_NO_COMMON_SIGNATURE_ALGORITHMS 253
#define SSL_R_DOWNGRADE_DETECTED 254
#define SSL_R_BUFFERED_MESSAGES_ON_CIPHER_CHANGE 255
#define SSL_R_INVALID_COMPRESSION_LIST 256
#define SSL_R_DUPLICATE_EXTENSION 257
#define SSL_R_MISSING_KEY_SHARE 258
#define SSL_R_INVALID_ALPN_PROTOCOL 259
#define SSL_R_TOO_MANY_KEY_UPDATES 260
#define SSL_R_BLOCK_CIPHER_PAD_IS_WRONG 261
#define SSL_R_NO_CIPHERS_SPECIFIED 262
#define SSL_R_RENEGOTIATION_EMS_MISMATCH 263
#define SSL_R_DUPLICATE_KEY_SHARE 264
#define SSL_R_NO_GROUPS_SPECIFIED 265
#define SSL_R_NO_SHARED_GROUP 266
#define SSL_R_PRE_SHARED_KEY_MUST_BE_LAST 267
#define SSL_R_OLD_SESSION_PRF_HASH_MISMATCH 268
#define SSL_R_INVALID_SCT_LIST 269
#define SSL_R_TOO_MUCH_SKIPPED_EARLY_DATA 270
#define SSL_R_PSK_IDENTITY_BINDER_COUNT_MISMATCH 271
#define SSL_R_CANNOT_PARSE_LEAF_CERT 272
#define SSL_R_SERVER_CERT_CHANGED 273
#define SSL_R_CERTIFICATE_AND_PRIVATE_KEY_MISMATCH 274
#define SSL_R_CANNOT_HAVE_BOTH_PRIVKEY_AND_METHOD 275
#define SSL_R_TICKET_ENCRYPTION_FAILED 276
#define SSL_R_ALPN_MISMATCH_ON_EARLY_DATA 277
#define SSL_R_WRONG_VERSION_ON_EARLY_DATA 278
#define SSL_R_UNEXPECTED_EXTENSION_ON_EARLY_DATA 279
#define SSL_R_NO_SUPPORTED_VERSIONS_ENABLED 280
#define SSL_R_APPLICATION_DATA_INSTEAD_OF_HANDSHAKE 281
#define SSL_R_EMPTY_HELLO_RETRY_REQUEST 282
#define SSL_R_EARLY_DATA_NOT_IN_USE 283
#define SSL_R_HANDSHAKE_NOT_COMPLETE 284
#define SSL_R_NEGOTIATED_TB_WITHOUT_EMS_OR_RI 285
#define SSL_R_SERVER_ECHOED_INVALID_SESSION_ID 286
#define SSL_R_PRIVATE_KEY_OPERATION_FAILED 287
#define SSL_R_SECOND_SERVERHELLO_VERSION_MISMATCH 288
#define SSL_R_OCSP_CB_ERROR 289
#define SSL_R_SSL_SESSION_ID_TOO_LONG 290
#define SSL_R_APPLICATION_DATA_ON_SHUTDOWN 291
#define SSL_R_CERT_DECOMPRESSION_FAILED 292
#define SSL_R_UNCOMPRESSED_CERT_TOO_LARGE 293
#define SSL_R_UNKNOWN_CERT_COMPRESSION_ALG 294
#define SSL_R_INVALID_SIGNATURE_ALGORITHM 295
#define SSL_R_DUPLICATE_SIGNATURE_ALGORITHM 296
#define SSL_R_TLS13_DOWNGRADE 297
#define SSL_R_QUIC_INTERNAL_ERROR 298
#define SSL_R_WRONG_ENCRYPTION_LEVEL_RECEIVED 299
#define SSL_R_SSLV3_ALERT_CLOSE_NOTIFY 1000
#define SSL_R_SSLV3_ALERT_UNEXPECTED_MESSAGE 1010
#define SSL_R_SSLV3_ALERT_BAD_RECORD_MAC 1020
#define SSL_R_TLSV1_ALERT_DECRYPTION_FAILED 1021
#define SSL_R_TLSV1_ALERT_RECORD_OVERFLOW 1022
#define SSL_R_SSLV3_ALERT_DECOMPRESSION_FAILURE 1030
#define SSL_R_SSLV3_ALERT_HANDSHAKE_FAILURE 1040
#define SSL_R_SSLV3_ALERT_NO_CERTIFICATE 1041
#define SSL_R_SSLV3_ALERT_BAD_CERTIFICATE 1042
#define SSL_R_SSLV3_ALERT_UNSUPPORTED_CERTIFICATE 1043
#define SSL_R_SSLV3_ALERT_CERTIFICATE_REVOKED 1044
#define SSL_R_SSLV3_ALERT_CERTIFICATE_EXPIRED 1045
#define SSL_R_SSLV3_ALERT_CERTIFICATE_UNKNOWN 1046
#define SSL_R_SSLV3_ALERT_ILLEGAL_PARAMETER 1047
#define SSL_R_TLSV1_ALERT_UNKNOWN_CA 1048
#define SSL_R_TLSV1_ALERT_ACCESS_DENIED 1049
#define SSL_R_TLSV1_ALERT_DECODE_ERROR 1050
#define SSL_R_TLSV1_ALERT_DECRYPT_ERROR 1051
#define SSL_R_TLSV1_ALERT_EXPORT_RESTRICTION 1060
#define SSL_R_TLSV1_ALERT_PROTOCOL_VERSION 1070
#define SSL_R_TLSV1_ALERT_INSUFFICIENT_SECURITY 1071
#define SSL_R_TLSV1_ALERT_INTERNAL_ERROR 1080
#define SSL_R_TLSV1_ALERT_INAPPROPRIATE_FALLBACK 1086
#define SSL_R_TLSV1_ALERT_USER_CANCELLED 1090
#define SSL_R_TLSV1_ALERT_NO_RENEGOTIATION 1100
#define SSL_R_TLSV1_UNSUPPORTED_EXTENSION 1110
#define SSL_R_TLSV1_CERTIFICATE_UNOBTAINABLE 1111
#define SSL_R_TLSV1_UNRECOGNIZED_NAME 1112
#define SSL_R_TLSV1_BAD_CERTIFICATE_STATUS_RESPONSE 1113
#define SSL_R_TLSV1_BAD_CERTIFICATE_HASH_VALUE 1114
#define SSL_R_TLSV1_UNKNOWN_PSK_IDENTITY 1115
#define SSL_R_TLSV1_CERTIFICATE_REQUIRED 1116
#define SSL_R_TOO_MUCH_READ_EARLY_DATA 1117
#endif // OPENSSL_HEADER_SSL_H
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