2e839244b0
Before RFC 7539 we had a ChaCha20-Poly1305 cipher suite that had a 64/64 nonce/counter split (as DJB's original ChaCha20 did). RFC 7539 changed that to 96/32 and we've supported both for some time. This change removes the old version and the TLS cipher suites that used it. BUG=chromium:682816 Change-Id: I2345d6db83441691fe0c1ab6d7c6da4d24777849 Reviewed-on: https://boringssl-review.googlesource.com/13203 Reviewed-by: Adam Langley <agl@google.com>
1956 lines
80 KiB
C
1956 lines
80 KiB
C
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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* All rights reserved.
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*
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* This package is an SSL implementation written
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* by Eric Young (eay@cryptsoft.com).
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* The implementation was written so as to conform with Netscapes SSL.
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*
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* This library is free for commercial and non-commercial use as long as
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* the following conditions are aheared to. The following conditions
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* apply to all code found in this distribution, be it the RC4, RSA,
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* lhash, DES, etc., code; not just the SSL code. The SSL documentation
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* included with this distribution is covered by the same copyright terms
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* except that the holder is Tim Hudson (tjh@cryptsoft.com).
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*
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* Copyright remains Eric Young's, and as such any Copyright notices in
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* the code are not to be removed.
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* If this package is used in a product, Eric Young should be given attribution
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* as the author of the parts of the library used.
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* This can be in the form of a textual message at program startup or
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* in documentation (online or textual) provided with the package.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* "This product includes cryptographic software written by
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* Eric Young (eay@cryptsoft.com)"
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* The word 'cryptographic' can be left out if the rouines from the library
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* being used are not cryptographic related :-).
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* 4. If you include any Windows specific code (or a derivative thereof) from
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* the apps directory (application code) you must include an acknowledgement:
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* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
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*
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* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* The licence and distribution terms for any publically available version or
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* derivative of this code cannot be changed. i.e. this code cannot simply be
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* copied and put under another distribution licence
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* [including the GNU Public Licence.]
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*/
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/* ====================================================================
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* Copyright (c) 1998-2007 The OpenSSL Project. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. All advertising materials mentioning features or use of this
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* software must display the following acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
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*
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* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
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* endorse or promote products derived from this software without
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* prior written permission. For written permission, please contact
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* openssl-core@openssl.org.
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*
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* 5. Products derived from this software may not be called "OpenSSL"
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* nor may "OpenSSL" appear in their names without prior written
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* permission of the OpenSSL Project.
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*
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* 6. Redistributions of any form whatsoever must retain the following
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* acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit (http://www.openssl.org/)"
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*
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* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
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* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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* ====================================================================
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*
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* This product includes cryptographic software written by Eric Young
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* (eay@cryptsoft.com). This product includes software written by Tim
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* Hudson (tjh@cryptsoft.com).
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*
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*/
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/* ====================================================================
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* Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
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* ECC cipher suite support in OpenSSL originally developed by
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* SUN MICROSYSTEMS, INC., and contributed to the OpenSSL project.
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*/
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/* ====================================================================
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* Copyright 2005 Nokia. All rights reserved.
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*
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* The portions of the attached software ("Contribution") is developed by
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* Nokia Corporation and is licensed pursuant to the OpenSSL open source
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* license.
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*
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* The Contribution, originally written by Mika Kousa and Pasi Eronen of
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* Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites
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* support (see RFC 4279) to OpenSSL.
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*
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* No patent licenses or other rights except those expressly stated in
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* the OpenSSL open source license shall be deemed granted or received
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* expressly, by implication, estoppel, or otherwise.
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*
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* No assurances are provided by Nokia that the Contribution does not
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* infringe the patent or other intellectual property rights of any third
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* party or that the license provides you with all the necessary rights
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* to make use of the Contribution.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN
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* ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA
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* SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY
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* OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR
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* OTHERWISE.
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*/
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#ifndef OPENSSL_HEADER_SSL_INTERNAL_H
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#define OPENSSL_HEADER_SSL_INTERNAL_H
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#include <openssl/base.h>
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#include <openssl/aead.h>
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#include <openssl/ssl.h>
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#include <openssl/stack.h>
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#if defined(OPENSSL_WINDOWS)
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/* Windows defines struct timeval in winsock2.h. */
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OPENSSL_MSVC_PRAGMA(warning(push, 3))
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#include <winsock2.h>
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OPENSSL_MSVC_PRAGMA(warning(pop))
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#else
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#include <sys/time.h>
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#endif
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#if defined(__cplusplus)
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extern "C" {
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#endif
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/* Cipher suites. */
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/* Bits for |algorithm_mkey| (key exchange algorithm). */
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#define SSL_kRSA 0x00000001L
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#define SSL_kDHE 0x00000002L
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#define SSL_kECDHE 0x00000004L
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/* SSL_kPSK is only set for plain PSK, not ECDHE_PSK. */
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#define SSL_kPSK 0x00000008L
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#define SSL_kGENERIC 0x00000010L
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/* Bits for |algorithm_auth| (server authentication). */
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#define SSL_aRSA 0x00000001L
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#define SSL_aECDSA 0x00000002L
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/* SSL_aPSK is set for both PSK and ECDHE_PSK. */
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#define SSL_aPSK 0x00000004L
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#define SSL_aGENERIC 0x00000008L
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#define SSL_aCERT (SSL_aRSA | SSL_aECDSA)
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/* Bits for |algorithm_enc| (symmetric encryption). */
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#define SSL_3DES 0x00000001L
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#define SSL_AES128 0x00000002L
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#define SSL_AES256 0x00000004L
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#define SSL_AES128GCM 0x00000008L
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#define SSL_AES256GCM 0x00000010L
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#define SSL_eNULL 0x00000020L
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#define SSL_CHACHA20POLY1305 0x00000040L
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#define SSL_AES (SSL_AES128 | SSL_AES256 | SSL_AES128GCM | SSL_AES256GCM)
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/* Bits for |algorithm_mac| (symmetric authentication). */
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#define SSL_SHA1 0x00000001L
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#define SSL_SHA256 0x00000002L
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#define SSL_SHA384 0x00000004L
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/* SSL_AEAD is set for all AEADs. */
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#define SSL_AEAD 0x00000008L
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/* Bits for |algorithm_prf| (handshake digest). */
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#define SSL_HANDSHAKE_MAC_DEFAULT 0x1
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#define SSL_HANDSHAKE_MAC_SHA256 0x2
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#define SSL_HANDSHAKE_MAC_SHA384 0x4
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/* SSL_MAX_DIGEST is the number of digest types which exist. When adding a new
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* one, update the table in ssl_cipher.c. */
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#define SSL_MAX_DIGEST 4
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/* ssl_cipher_get_evp_aead sets |*out_aead| to point to the correct EVP_AEAD
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* object for |cipher| protocol version |version|. It sets |*out_mac_secret_len|
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* and |*out_fixed_iv_len| to the MAC key length and fixed IV length,
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* respectively. The MAC key length is zero except for legacy block and stream
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* ciphers. It returns 1 on success and 0 on error. */
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int ssl_cipher_get_evp_aead(const EVP_AEAD **out_aead,
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size_t *out_mac_secret_len,
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size_t *out_fixed_iv_len,
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const SSL_CIPHER *cipher, uint16_t version);
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/* ssl_get_handshake_digest returns the |EVP_MD| corresponding to
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* |algorithm_prf|. It returns SHA-1 for |SSL_HANDSHAKE_DEFAULT|. The caller is
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* responsible for maintaining the additional MD5 digest and switching to
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* SHA-256 in TLS 1.2. */
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const EVP_MD *ssl_get_handshake_digest(uint32_t algorithm_prf);
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/* ssl_create_cipher_list evaluates |rule_str| according to the ciphers in
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* |ssl_method|. It sets |*out_cipher_list| to a newly-allocated
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* |ssl_cipher_preference_list_st| containing the result. It returns
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* |(*out_cipher_list)->ciphers| on success and NULL on
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* failure. */
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STACK_OF(SSL_CIPHER) *
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ssl_create_cipher_list(const SSL_PROTOCOL_METHOD *ssl_method,
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struct ssl_cipher_preference_list_st **out_cipher_list,
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const char *rule_str);
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/* ssl_cipher_get_value returns the cipher suite id of |cipher|. */
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uint16_t ssl_cipher_get_value(const SSL_CIPHER *cipher);
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/* ssl_cipher_get_key_type returns the |EVP_PKEY_*| value corresponding to the
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* server key used in |cipher| or |EVP_PKEY_NONE| if there is none. */
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int ssl_cipher_get_key_type(const SSL_CIPHER *cipher);
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/* ssl_cipher_uses_certificate_auth returns one if |cipher| authenticates the
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* server and, optionally, the client with a certificate. Otherwise it returns
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* zero. */
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int ssl_cipher_uses_certificate_auth(const SSL_CIPHER *cipher);
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/* ssl_cipher_requires_server_key_exchange returns 1 if |cipher| requires a
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* ServerKeyExchange message. Otherwise it returns 0.
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*
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* This function may return zero while still allowing |cipher| an optional
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* ServerKeyExchange. This is the case for plain PSK ciphers. */
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int ssl_cipher_requires_server_key_exchange(const SSL_CIPHER *cipher);
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/* ssl_cipher_get_record_split_len, for TLS 1.0 CBC mode ciphers, returns the
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* length of an encrypted 1-byte record, for use in record-splitting. Otherwise
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* it returns zero. */
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size_t ssl_cipher_get_record_split_len(const SSL_CIPHER *cipher);
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/* Encryption layer. */
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/* SSL_AEAD_CTX contains information about an AEAD that is being used to encrypt
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* an SSL connection. */
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typedef struct ssl_aead_ctx_st {
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const SSL_CIPHER *cipher;
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EVP_AEAD_CTX ctx;
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/* fixed_nonce contains any bytes of the nonce that are fixed for all
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* records. */
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uint8_t fixed_nonce[12];
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uint8_t fixed_nonce_len, variable_nonce_len;
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/* variable_nonce_included_in_record is non-zero if the variable nonce
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* for a record is included as a prefix before the ciphertext. */
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char variable_nonce_included_in_record;
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/* random_variable_nonce is non-zero if the variable nonce is
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* randomly generated, rather than derived from the sequence
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* number. */
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char random_variable_nonce;
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/* omit_length_in_ad is non-zero if the length should be omitted in the
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* AEAD's ad parameter. */
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char omit_length_in_ad;
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/* omit_version_in_ad is non-zero if the version should be omitted
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* in the AEAD's ad parameter. */
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char omit_version_in_ad;
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/* omit_ad is non-zero if the AEAD's ad parameter should be omitted. */
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char omit_ad;
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/* xor_fixed_nonce is non-zero if the fixed nonce should be XOR'd into the
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* variable nonce rather than prepended. */
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char xor_fixed_nonce;
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} SSL_AEAD_CTX;
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/* SSL_AEAD_CTX_new creates a newly-allocated |SSL_AEAD_CTX| using the supplied
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* key material. It returns NULL on error. Only one of |SSL_AEAD_CTX_open| or
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* |SSL_AEAD_CTX_seal| may be used with the resulting object, depending on
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* |direction|. |version| is the normalized protocol version, so DTLS 1.0 is
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* represented as 0x0301, not 0xffef. */
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SSL_AEAD_CTX *SSL_AEAD_CTX_new(enum evp_aead_direction_t direction,
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uint16_t version, const SSL_CIPHER *cipher,
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const uint8_t *enc_key, size_t enc_key_len,
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const uint8_t *mac_key, size_t mac_key_len,
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const uint8_t *fixed_iv, size_t fixed_iv_len);
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/* SSL_AEAD_CTX_free frees |ctx|. */
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void SSL_AEAD_CTX_free(SSL_AEAD_CTX *ctx);
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/* SSL_AEAD_CTX_explicit_nonce_len returns the length of the explicit nonce for
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* |ctx|, if any. |ctx| may be NULL to denote the null cipher. */
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size_t SSL_AEAD_CTX_explicit_nonce_len(SSL_AEAD_CTX *ctx);
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/* SSL_AEAD_CTX_max_overhead returns the maximum overhead of calling
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* |SSL_AEAD_CTX_seal|. |ctx| may be NULL to denote the null cipher. */
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size_t SSL_AEAD_CTX_max_overhead(SSL_AEAD_CTX *ctx);
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/* SSL_AEAD_CTX_open authenticates and decrypts |in_len| bytes from |in|
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* in-place. On success, it sets |*out| to the plaintext in |in| and returns
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* one. Otherwise, it returns zero. |ctx| may be NULL to denote the null cipher.
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* The output will always be |explicit_nonce_len| bytes ahead of |in|. */
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int SSL_AEAD_CTX_open(SSL_AEAD_CTX *ctx, CBS *out, uint8_t type,
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uint16_t wire_version, const uint8_t seqnum[8],
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uint8_t *in, size_t in_len);
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/* SSL_AEAD_CTX_seal encrypts and authenticates |in_len| bytes from |in| and
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* writes the result to |out|. It returns one on success and zero on
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* error. |ctx| may be NULL to denote the null cipher.
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*
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* If |in| and |out| alias then |out| + |explicit_nonce_len| must be == |in|. */
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int SSL_AEAD_CTX_seal(SSL_AEAD_CTX *ctx, uint8_t *out, size_t *out_len,
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size_t max_out, uint8_t type, uint16_t wire_version,
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const uint8_t seqnum[8], const uint8_t *in,
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size_t in_len);
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/* DTLS replay bitmap. */
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/* DTLS1_BITMAP maintains a sliding window of 64 sequence numbers to detect
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* replayed packets. It should be initialized by zeroing every field. */
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typedef struct dtls1_bitmap_st {
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/* map is a bit mask of the last 64 sequence numbers. Bit
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* |1<<i| corresponds to |max_seq_num - i|. */
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uint64_t map;
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/* max_seq_num is the largest sequence number seen so far as a 64-bit
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* integer. */
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uint64_t max_seq_num;
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} DTLS1_BITMAP;
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/* Record layer. */
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/* ssl_record_sequence_update increments the sequence number in |seq|. It
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* returns one on success and zero on wraparound. */
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int ssl_record_sequence_update(uint8_t *seq, size_t seq_len);
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/* ssl_record_prefix_len returns the length of the prefix before the ciphertext
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* of a record for |ssl|.
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*
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* TODO(davidben): Expose this as part of public API once the high-level
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* buffer-free APIs are available. */
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size_t ssl_record_prefix_len(const SSL *ssl);
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enum ssl_open_record_t {
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ssl_open_record_success,
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ssl_open_record_discard,
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ssl_open_record_partial,
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ssl_open_record_close_notify,
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ssl_open_record_fatal_alert,
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ssl_open_record_error,
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};
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/* tls_open_record decrypts a record from |in| in-place.
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*
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* If the input did not contain a complete record, it returns
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* |ssl_open_record_partial|. It sets |*out_consumed| to the total number of
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* bytes necessary. It is guaranteed that a successful call to |tls_open_record|
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* will consume at least that many bytes.
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*
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* Otherwise, it sets |*out_consumed| to the number of bytes of input
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* consumed. Note that input may be consumed on all return codes if a record was
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* decrypted.
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*
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* On success, it returns |ssl_open_record_success|. It sets |*out_type| to the
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* record type and |*out| to the record body in |in|. Note that |*out| may be
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* empty.
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*
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* If a record was successfully processed but should be discarded, it returns
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* |ssl_open_record_discard|.
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*
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* If a record was successfully processed but is a close_notify or fatal alert,
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* it returns |ssl_open_record_close_notify| or |ssl_open_record_fatal_alert|.
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*
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* On failure, it returns |ssl_open_record_error| and sets |*out_alert| to an
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* alert to emit. */
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enum ssl_open_record_t tls_open_record(SSL *ssl, uint8_t *out_type, CBS *out,
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size_t *out_consumed, uint8_t *out_alert,
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uint8_t *in, size_t in_len);
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/* dtls_open_record implements |tls_open_record| for DTLS. It never returns
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* |ssl_open_record_partial| but otherwise behaves analogously. */
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enum ssl_open_record_t dtls_open_record(SSL *ssl, uint8_t *out_type, CBS *out,
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size_t *out_consumed,
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uint8_t *out_alert, uint8_t *in,
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size_t in_len);
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/* ssl_seal_align_prefix_len returns the length of the prefix before the start
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* of the bulk of the ciphertext when sealing a record with |ssl|. Callers may
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* use this to align buffers.
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*
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* Note when TLS 1.0 CBC record-splitting is enabled, this includes the one byte
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|
* record and is the offset into second record's ciphertext. Thus this value may
|
|
* differ from |ssl_record_prefix_len| and sealing a small record may result in
|
|
* a smaller output than this value.
|
|
*
|
|
* TODO(davidben): Expose this as part of public API once the high-level
|
|
* buffer-free APIs are available. */
|
|
size_t ssl_seal_align_prefix_len(const SSL *ssl);
|
|
|
|
/* tls_seal_record seals a new record of type |type| and body |in| and writes it
|
|
* to |out|. At most |max_out| bytes will be written. It returns one on success
|
|
* and zero on error. If enabled, |tls_seal_record| implements TLS 1.0 CBC 1/n-1
|
|
* record splitting and may write two records concatenated.
|
|
*
|
|
* For a large record, the bulk of the ciphertext will begin
|
|
* |ssl_seal_align_prefix_len| bytes into out. Aligning |out| appropriately may
|
|
* improve performance. It writes at most |in_len| + |SSL_max_seal_overhead|
|
|
* bytes to |out|.
|
|
*
|
|
* |in| and |out| may not alias. */
|
|
int tls_seal_record(SSL *ssl, uint8_t *out, size_t *out_len, size_t max_out,
|
|
uint8_t type, const uint8_t *in, size_t in_len);
|
|
|
|
enum dtls1_use_epoch_t {
|
|
dtls1_use_previous_epoch,
|
|
dtls1_use_current_epoch,
|
|
};
|
|
|
|
/* dtls_seal_record implements |tls_seal_record| for DTLS. |use_epoch| selects
|
|
* which epoch's cipher state to use. */
|
|
int dtls_seal_record(SSL *ssl, uint8_t *out, size_t *out_len, size_t max_out,
|
|
uint8_t type, const uint8_t *in, size_t in_len,
|
|
enum dtls1_use_epoch_t use_epoch);
|
|
|
|
/* ssl_process_alert processes |in| as an alert and updates |ssl|'s shutdown
|
|
* state. It returns one of |ssl_open_record_discard|, |ssl_open_record_error|,
|
|
* |ssl_open_record_close_notify|, or |ssl_open_record_fatal_alert| as
|
|
* appropriate. */
|
|
enum ssl_open_record_t ssl_process_alert(SSL *ssl, uint8_t *out_alert,
|
|
const uint8_t *in, size_t in_len);
|
|
|
|
|
|
/* Private key operations. */
|
|
|
|
/* ssl_has_private_key returns one if |ssl| has a private key
|
|
* configured and zero otherwise. */
|
|
int ssl_has_private_key(const SSL *ssl);
|
|
|
|
/* ssl_is_ecdsa_key_type returns one if |type| is an ECDSA key type and zero
|
|
* otherwise. */
|
|
int ssl_is_ecdsa_key_type(int type);
|
|
|
|
/* ssl_private_key_* call the corresponding function on the
|
|
* |SSL_PRIVATE_KEY_METHOD| for |ssl|, if configured. Otherwise, they implement
|
|
* the operation with |EVP_PKEY|. */
|
|
|
|
int ssl_private_key_type(SSL *ssl);
|
|
|
|
size_t ssl_private_key_max_signature_len(SSL *ssl);
|
|
|
|
enum ssl_private_key_result_t ssl_private_key_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);
|
|
|
|
enum ssl_private_key_result_t ssl_private_key_decrypt(
|
|
SSL *ssl, uint8_t *out, size_t *out_len, size_t max_out,
|
|
const uint8_t *in, size_t in_len);
|
|
|
|
enum ssl_private_key_result_t ssl_private_key_complete(SSL *ssl, uint8_t *out,
|
|
size_t *out_len,
|
|
size_t max_out);
|
|
|
|
/* ssl_private_key_supports_signature_algorithm returns one if |ssl|'s private
|
|
* key supports |signature_algorithm| and zero otherwise. */
|
|
int ssl_private_key_supports_signature_algorithm(SSL *ssl,
|
|
uint16_t signature_algorithm);
|
|
|
|
/* ssl_public_key_verify verifies that the |signature| is valid for the public
|
|
* key |pkey| and input |in|, using the |signature_algorithm| specified. */
|
|
int ssl_public_key_verify(
|
|
SSL *ssl, const uint8_t *signature, size_t signature_len,
|
|
uint16_t signature_algorithm, EVP_PKEY *pkey,
|
|
const uint8_t *in, size_t in_len);
|
|
|
|
|
|
/* Custom extensions */
|
|
|
|
/* ssl_custom_extension (a.k.a. SSL_CUSTOM_EXTENSION) is a structure that
|
|
* contains information about custom-extension callbacks. */
|
|
struct ssl_custom_extension {
|
|
SSL_custom_ext_add_cb add_callback;
|
|
void *add_arg;
|
|
SSL_custom_ext_free_cb free_callback;
|
|
SSL_custom_ext_parse_cb parse_callback;
|
|
void *parse_arg;
|
|
uint16_t value;
|
|
};
|
|
|
|
void SSL_CUSTOM_EXTENSION_free(SSL_CUSTOM_EXTENSION *custom_extension);
|
|
|
|
int custom_ext_add_clienthello(SSL_HANDSHAKE *hs, CBB *extensions);
|
|
int custom_ext_parse_serverhello(SSL_HANDSHAKE *hs, int *out_alert,
|
|
uint16_t value, const CBS *extension);
|
|
int custom_ext_parse_clienthello(SSL_HANDSHAKE *hs, int *out_alert,
|
|
uint16_t value, const CBS *extension);
|
|
int custom_ext_add_serverhello(SSL_HANDSHAKE *hs, CBB *extensions);
|
|
|
|
|
|
/* Handshake hash.
|
|
*
|
|
* The TLS handshake maintains a transcript of all handshake messages. At
|
|
* various points in the protocol, this is either a handshake buffer, a rolling
|
|
* hash (selected by cipher suite) or both. */
|
|
|
|
/* ssl3_init_handshake_buffer initializes the handshake buffer and resets the
|
|
* handshake hash. It returns one success and zero on failure. */
|
|
int ssl3_init_handshake_buffer(SSL *ssl);
|
|
|
|
/* ssl3_init_handshake_hash initializes the handshake hash based on the pending
|
|
* cipher and the contents of the handshake buffer. Subsequent calls to
|
|
* |ssl3_update_handshake_hash| will update the rolling hash. It returns one on
|
|
* success and zero on failure. It is an error to call this function after the
|
|
* handshake buffer is released. */
|
|
int ssl3_init_handshake_hash(SSL *ssl);
|
|
|
|
/* ssl3_free_handshake_buffer releases the handshake buffer. Subsequent calls
|
|
* to |ssl3_update_handshake_hash| will not update the handshake buffer. */
|
|
void ssl3_free_handshake_buffer(SSL *ssl);
|
|
|
|
/* ssl3_free_handshake_hash releases the handshake hash. */
|
|
void ssl3_free_handshake_hash(SSL *ssl);
|
|
|
|
/* ssl3_update_handshake_hash adds |in| to the handshake buffer and handshake
|
|
* hash, whichever is enabled. It returns one on success and zero on failure. */
|
|
int ssl3_update_handshake_hash(SSL *ssl, const uint8_t *in, size_t in_len);
|
|
|
|
|
|
/* ECDH groups. */
|
|
|
|
typedef struct ssl_ecdh_ctx_st SSL_ECDH_CTX;
|
|
|
|
/* An SSL_ECDH_METHOD is an implementation of ECDH-like key exchanges for
|
|
* TLS. */
|
|
typedef struct ssl_ecdh_method_st {
|
|
int nid;
|
|
uint16_t group_id;
|
|
const char name[8];
|
|
|
|
/* cleanup releases state in |ctx|. */
|
|
void (*cleanup)(SSL_ECDH_CTX *ctx);
|
|
|
|
/* offer generates a keypair and writes the public value to
|
|
* |out_public_key|. It returns one on success and zero on error. */
|
|
int (*offer)(SSL_ECDH_CTX *ctx, CBB *out_public_key);
|
|
|
|
/* accept performs a key exchange against the |peer_key| generated by |offer|.
|
|
* On success, it returns one, writes the public value to |out_public_key|,
|
|
* and sets |*out_secret| and |*out_secret_len| to a newly-allocated buffer
|
|
* containing the shared secret. The caller must release this buffer with
|
|
* |OPENSSL_free|. On failure, it returns zero and sets |*out_alert| to an
|
|
* alert to send to the peer. */
|
|
int (*accept)(SSL_ECDH_CTX *ctx, CBB *out_public_key, uint8_t **out_secret,
|
|
size_t *out_secret_len, uint8_t *out_alert,
|
|
const uint8_t *peer_key, size_t peer_key_len);
|
|
|
|
/* finish performs a key exchange against the |peer_key| generated by
|
|
* |accept|. On success, it returns one and sets |*out_secret| and
|
|
* |*out_secret_len| to a newly-allocated buffer containing the shared
|
|
* secret. The caller must release this buffer with |OPENSSL_free|. On
|
|
* failure, it returns zero and sets |*out_alert| to an alert to send to the
|
|
* peer. */
|
|
int (*finish)(SSL_ECDH_CTX *ctx, uint8_t **out_secret, size_t *out_secret_len,
|
|
uint8_t *out_alert, const uint8_t *peer_key,
|
|
size_t peer_key_len);
|
|
|
|
/* get_key initializes |out| with a length-prefixed key from |cbs|. It returns
|
|
* one on success and zero on error. */
|
|
int (*get_key)(CBS *cbs, CBS *out);
|
|
|
|
/* add_key initializes |out_contents| to receive a key. Typically it will then
|
|
* be passed to |offer| or |accept|. It returns one on success and zero on
|
|
* error. */
|
|
int (*add_key)(CBB *cbb, CBB *out_contents);
|
|
} SSL_ECDH_METHOD;
|
|
|
|
struct ssl_ecdh_ctx_st {
|
|
const SSL_ECDH_METHOD *method;
|
|
void *data;
|
|
};
|
|
|
|
/* ssl_nid_to_group_id looks up the group corresponding to |nid|. On success, it
|
|
* sets |*out_group_id| to the group ID and returns one. Otherwise, it returns
|
|
* zero. */
|
|
int ssl_nid_to_group_id(uint16_t *out_group_id, int nid);
|
|
|
|
/* ssl_name_to_group_id looks up the group corresponding to the |name| string
|
|
* of length |len|. On success, it sets |*out_group_id| to the group ID and
|
|
* returns one. Otherwise, it returns zero. */
|
|
int ssl_name_to_group_id(uint16_t *out_group_id, const char *name, size_t len);
|
|
|
|
/* SSL_ECDH_CTX_init sets up |ctx| for use with curve |group_id|. It returns one
|
|
* on success and zero on error. */
|
|
int SSL_ECDH_CTX_init(SSL_ECDH_CTX *ctx, uint16_t group_id);
|
|
|
|
/* SSL_ECDH_CTX_init_for_dhe sets up |ctx| for use with legacy DHE-based ciphers
|
|
* where the server specifies a group. It takes ownership of |params|. */
|
|
void SSL_ECDH_CTX_init_for_dhe(SSL_ECDH_CTX *ctx, DH *params);
|
|
|
|
/* SSL_ECDH_CTX_cleanup releases memory associated with |ctx|. It is legal to
|
|
* call it in the zero state. */
|
|
void SSL_ECDH_CTX_cleanup(SSL_ECDH_CTX *ctx);
|
|
|
|
/* SSL_ECDH_CTX_get_id returns the group ID for |ctx|. */
|
|
uint16_t SSL_ECDH_CTX_get_id(const SSL_ECDH_CTX *ctx);
|
|
|
|
/* SSL_ECDH_CTX_get_key calls the |get_key| method of |SSL_ECDH_METHOD|. */
|
|
int SSL_ECDH_CTX_get_key(SSL_ECDH_CTX *ctx, CBS *cbs, CBS *out);
|
|
|
|
/* SSL_ECDH_CTX_add_key calls the |add_key| method of |SSL_ECDH_METHOD|. */
|
|
int SSL_ECDH_CTX_add_key(SSL_ECDH_CTX *ctx, CBB *cbb, CBB *out_contents);
|
|
|
|
/* SSL_ECDH_CTX_offer calls the |offer| method of |SSL_ECDH_METHOD|. */
|
|
int SSL_ECDH_CTX_offer(SSL_ECDH_CTX *ctx, CBB *out_public_key);
|
|
|
|
/* SSL_ECDH_CTX_accept calls the |accept| method of |SSL_ECDH_METHOD|. */
|
|
int SSL_ECDH_CTX_accept(SSL_ECDH_CTX *ctx, CBB *out_public_key,
|
|
uint8_t **out_secret, size_t *out_secret_len,
|
|
uint8_t *out_alert, const uint8_t *peer_key,
|
|
size_t peer_key_len);
|
|
|
|
/* SSL_ECDH_CTX_finish the |finish| method of |SSL_ECDH_METHOD|. */
|
|
int SSL_ECDH_CTX_finish(SSL_ECDH_CTX *ctx, uint8_t **out_secret,
|
|
size_t *out_secret_len, uint8_t *out_alert,
|
|
const uint8_t *peer_key, size_t peer_key_len);
|
|
|
|
/* Handshake messages. */
|
|
|
|
/* SSL_MAX_HANDSHAKE_FLIGHT is the number of messages, including
|
|
* ChangeCipherSpec, in the longest handshake flight. Currently this is the
|
|
* client's second leg in a full handshake when client certificates, NPN, and
|
|
* Channel ID, are all enabled. */
|
|
#define SSL_MAX_HANDSHAKE_FLIGHT 7
|
|
|
|
/* ssl_max_handshake_message_len returns the maximum number of bytes permitted
|
|
* in a handshake message for |ssl|. */
|
|
size_t ssl_max_handshake_message_len(const SSL *ssl);
|
|
|
|
/* dtls_clear_incoming_messages releases all buffered incoming messages. */
|
|
void dtls_clear_incoming_messages(SSL *ssl);
|
|
|
|
/* dtls_has_incoming_messages returns one if there are buffered incoming
|
|
* messages ahead of the current message and zero otherwise. */
|
|
int dtls_has_incoming_messages(const SSL *ssl);
|
|
|
|
typedef struct dtls_outgoing_message_st {
|
|
uint8_t *data;
|
|
uint32_t len;
|
|
uint16_t epoch;
|
|
char is_ccs;
|
|
} DTLS_OUTGOING_MESSAGE;
|
|
|
|
/* dtls_clear_outgoing_messages releases all buffered outgoing messages. */
|
|
void dtls_clear_outgoing_messages(SSL *ssl);
|
|
|
|
|
|
/* Callbacks. */
|
|
|
|
/* ssl_do_info_callback calls |ssl|'s info callback, if set. */
|
|
void ssl_do_info_callback(const SSL *ssl, int type, int value);
|
|
|
|
/* ssl_do_msg_callback calls |ssl|'s message callback, if set. */
|
|
void ssl_do_msg_callback(SSL *ssl, int is_write, int content_type,
|
|
const void *buf, size_t len);
|
|
|
|
|
|
/* Transport buffers. */
|
|
|
|
/* ssl_read_buffer returns a pointer to contents of the read buffer. */
|
|
uint8_t *ssl_read_buffer(SSL *ssl);
|
|
|
|
/* ssl_read_buffer_len returns the length of the read buffer. */
|
|
size_t ssl_read_buffer_len(const SSL *ssl);
|
|
|
|
/* ssl_read_buffer_extend_to extends the read buffer to the desired length. For
|
|
* TLS, it reads to the end of the buffer until the buffer is |len| bytes
|
|
* long. For DTLS, it reads a new packet and ignores |len|. It returns one on
|
|
* success, zero on EOF, and a negative number on error.
|
|
*
|
|
* It is an error to call |ssl_read_buffer_extend_to| in DTLS when the buffer is
|
|
* non-empty. */
|
|
int ssl_read_buffer_extend_to(SSL *ssl, size_t len);
|
|
|
|
/* ssl_read_buffer_consume consumes |len| bytes from the read buffer. It
|
|
* advances the data pointer and decrements the length. The memory consumed will
|
|
* remain valid until the next call to |ssl_read_buffer_extend| or it is
|
|
* discarded with |ssl_read_buffer_discard|. */
|
|
void ssl_read_buffer_consume(SSL *ssl, size_t len);
|
|
|
|
/* ssl_read_buffer_discard discards the consumed bytes from the read buffer. If
|
|
* the buffer is now empty, it releases memory used by it. */
|
|
void ssl_read_buffer_discard(SSL *ssl);
|
|
|
|
/* ssl_read_buffer_clear releases all memory associated with the read buffer and
|
|
* zero-initializes it. */
|
|
void ssl_read_buffer_clear(SSL *ssl);
|
|
|
|
/* ssl_write_buffer_is_pending returns one if the write buffer has pending data
|
|
* and zero if is empty. */
|
|
int ssl_write_buffer_is_pending(const SSL *ssl);
|
|
|
|
/* ssl_write_buffer_init initializes the write buffer. On success, it sets
|
|
* |*out_ptr| to the start of the write buffer with space for up to |max_len|
|
|
* bytes. It returns one on success and zero on failure. Call
|
|
* |ssl_write_buffer_set_len| to complete initialization. */
|
|
int ssl_write_buffer_init(SSL *ssl, uint8_t **out_ptr, size_t max_len);
|
|
|
|
/* ssl_write_buffer_set_len is called after |ssl_write_buffer_init| to complete
|
|
* initialization after |len| bytes are written to the buffer. */
|
|
void ssl_write_buffer_set_len(SSL *ssl, size_t len);
|
|
|
|
/* ssl_write_buffer_flush flushes the write buffer to the transport. It returns
|
|
* one on success and <= 0 on error. For DTLS, whether or not the write
|
|
* succeeds, the write buffer will be cleared. */
|
|
int ssl_write_buffer_flush(SSL *ssl);
|
|
|
|
/* ssl_write_buffer_clear releases all memory associated with the write buffer
|
|
* and zero-initializes it. */
|
|
void ssl_write_buffer_clear(SSL *ssl);
|
|
|
|
|
|
/* Certificate functions. */
|
|
|
|
/* ssl_has_certificate returns one if a certificate and private key are
|
|
* configured and zero otherwise. */
|
|
int ssl_has_certificate(const SSL *ssl);
|
|
|
|
/* ssl_parse_x509 parses a X509 certificate from |cbs|. It returns NULL
|
|
* on error. */
|
|
X509 *ssl_parse_x509(CBS *cbs);
|
|
|
|
/* ssl_session_x509_cache_objects fills out |sess->x509_peer| and
|
|
* |sess->x509_chain| from |sess->certs| and erases
|
|
* |sess->x509_chain_without_leaf|. It returns one on success or zero on
|
|
* error. */
|
|
int ssl_session_x509_cache_objects(SSL_SESSION *sess);
|
|
|
|
/* ssl_parse_cert_chain parses a certificate list from |cbs| in the format used
|
|
* by a TLS Certificate message. On success, it returns a newly-allocated
|
|
* |CRYPTO_BUFFER| list and advances |cbs|. Otherwise, it returns NULL and sets
|
|
* |*out_alert| to an alert to send to the peer.
|
|
*
|
|
* If the list is non-empty then |*out_pubkey| will be set to a freshly
|
|
* allocated public-key from the leaf certificate.
|
|
*
|
|
* If the list is non-empty and |out_leaf_sha256| is non-NULL, it writes the
|
|
* SHA-256 hash of the leaf to |out_leaf_sha256|. */
|
|
STACK_OF(CRYPTO_BUFFER) *ssl_parse_cert_chain(uint8_t *out_alert,
|
|
EVP_PKEY **out_pubkey,
|
|
uint8_t *out_leaf_sha256,
|
|
CBS *cbs,
|
|
CRYPTO_BUFFER_POOL *pool);
|
|
|
|
/* ssl_add_cert_to_cbb adds |x509| to |cbb|. It returns one on success and zero
|
|
* on error. */
|
|
int ssl_add_cert_to_cbb(CBB *cbb, X509 *x509);
|
|
|
|
/* ssl_add_cert_chain adds |ssl|'s certificate chain to |cbb| in the format used
|
|
* by a TLS Certificate message. If there is no certificate chain, it emits an
|
|
* empty certificate list. It returns one on success and zero on error. */
|
|
int ssl_add_cert_chain(SSL *ssl, CBB *cbb);
|
|
|
|
/* ssl_auto_chain_if_needed runs the deprecated auto-chaining logic if
|
|
* necessary. On success, it updates |ssl|'s certificate configuration as needed
|
|
* and returns one. Otherwise, it returns zero. */
|
|
int ssl_auto_chain_if_needed(SSL *ssl);
|
|
|
|
/* ssl_cert_check_digital_signature_key_usage parses the DER-encoded, X.509
|
|
* certificate in |in| and returns one if doesn't specify a key usage or, if it
|
|
* does, if it includes digitalSignature. Otherwise it pushes to the error
|
|
* queue and returns zero. */
|
|
int ssl_cert_check_digital_signature_key_usage(const CBS *in);
|
|
|
|
/* ssl_cert_parse_pubkey extracts the public key from the DER-encoded, X.509
|
|
* certificate in |in|. It returns an allocated |EVP_PKEY| or else returns NULL
|
|
* and pushes to the error queue. */
|
|
EVP_PKEY *ssl_cert_parse_pubkey(const CBS *in);
|
|
|
|
/* ssl_parse_client_CA_list parses a CA list from |cbs| in the format used by a
|
|
* TLS CertificateRequest message. On success, it returns a newly-allocated
|
|
* |X509_NAME| list and advances |cbs|. Otherwise, it returns NULL and sets
|
|
* |*out_alert| to an alert to send to the peer. */
|
|
STACK_OF(X509_NAME) *
|
|
ssl_parse_client_CA_list(SSL *ssl, uint8_t *out_alert, CBS *cbs);
|
|
|
|
/* ssl_add_client_CA_list adds the configured CA list to |cbb| in the format
|
|
* used by a TLS CertificateRequest message. It returns one on success and zero
|
|
* on error. */
|
|
int ssl_add_client_CA_list(SSL *ssl, CBB *cbb);
|
|
|
|
/* ssl_check_leaf_certificate returns one if |pkey| and |leaf| are suitable as
|
|
* a server's leaf certificate for |ssl|. Otherwise, it returns zero and pushes
|
|
* an error on the error queue. */
|
|
int ssl_check_leaf_certificate(SSL *ssl, EVP_PKEY *pkey,
|
|
const CRYPTO_BUFFER *leaf);
|
|
|
|
|
|
/* TLS 1.3 key derivation. */
|
|
|
|
/* tls13_init_key_schedule initializes the handshake hash and key derivation
|
|
* state. The cipher suite and PRF hash must have been selected at this point.
|
|
* It returns one on success and zero on error. */
|
|
int tls13_init_key_schedule(SSL_HANDSHAKE *hs);
|
|
|
|
/* tls13_advance_key_schedule incorporates |in| into the key schedule with
|
|
* HKDF-Extract. It returns one on success and zero on error. */
|
|
int tls13_advance_key_schedule(SSL_HANDSHAKE *hs, const uint8_t *in,
|
|
size_t len);
|
|
|
|
/* tls13_get_context_hash writes Hash(Handshake Context) to |out| which must
|
|
* have room for at least |EVP_MAX_MD_SIZE| bytes. On success, it returns one
|
|
* and sets |*out_len| to the number of bytes written. Otherwise, it returns
|
|
* zero. */
|
|
int tls13_get_context_hash(SSL *ssl, uint8_t *out, size_t *out_len);
|
|
|
|
/* tls13_set_traffic_key sets the read or write traffic keys to
|
|
* |traffic_secret|. It returns one on success and zero on error. */
|
|
int tls13_set_traffic_key(SSL *ssl, enum evp_aead_direction_t direction,
|
|
const uint8_t *traffic_secret,
|
|
size_t traffic_secret_len);
|
|
|
|
/* tls13_derive_handshake_secrets derives the handshake traffic secret. It
|
|
* returns one on success and zero on error. */
|
|
int tls13_derive_handshake_secrets(SSL_HANDSHAKE *hs);
|
|
|
|
/* tls13_rotate_traffic_key derives the next read or write traffic secret. It
|
|
* returns one on success and zero on error. */
|
|
int tls13_rotate_traffic_key(SSL *ssl, enum evp_aead_direction_t direction);
|
|
|
|
/* tls13_derive_application_secrets derives the initial application data traffic
|
|
* and exporter secrets based on the handshake transcripts and |master_secret|.
|
|
* It returns one on success and zero on error. */
|
|
int tls13_derive_application_secrets(SSL_HANDSHAKE *hs);
|
|
|
|
/* tls13_derive_resumption_secret derives the |resumption_secret|. */
|
|
int tls13_derive_resumption_secret(SSL_HANDSHAKE *hs);
|
|
|
|
/* tls13_export_keying_material provides an exporter interface to use the
|
|
* |exporter_secret|. */
|
|
int tls13_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);
|
|
|
|
/* tls13_finished_mac calculates the MAC of the handshake transcript to verify
|
|
* the integrity of the Finished message, and stores the result in |out| and
|
|
* length in |out_len|. |is_server| is 1 if this is for the Server Finished and
|
|
* 0 for the Client Finished. */
|
|
int tls13_finished_mac(SSL_HANDSHAKE *hs, uint8_t *out,
|
|
size_t *out_len, int is_server);
|
|
|
|
/* tls13_write_psk_binder calculates the PSK binder value and replaces the last
|
|
* bytes of |msg| with the resulting value. It returns 1 on success, and 0 on
|
|
* failure. */
|
|
int tls13_write_psk_binder(SSL *ssl, uint8_t *msg, size_t len);
|
|
|
|
/* tls13_verify_psk_binder verifies that the handshake transcript, truncated
|
|
* up to the binders has a valid signature using the value of |session|'s
|
|
* resumption secret. It returns 1 on success, and 0 on failure. */
|
|
int tls13_verify_psk_binder(SSL *ssl, SSL_SESSION *session, CBS *binders);
|
|
|
|
|
|
/* Handshake functions. */
|
|
|
|
enum ssl_hs_wait_t {
|
|
ssl_hs_error,
|
|
ssl_hs_ok,
|
|
ssl_hs_read_message,
|
|
ssl_hs_write_message,
|
|
ssl_hs_flush,
|
|
ssl_hs_flush_and_read_message,
|
|
ssl_hs_x509_lookup,
|
|
ssl_hs_channel_id_lookup,
|
|
ssl_hs_private_key_operation,
|
|
};
|
|
|
|
struct ssl_handshake_st {
|
|
/* ssl is a non-owning pointer to the parent |SSL| object. */
|
|
SSL *ssl;
|
|
|
|
/* do_tls13_handshake runs the TLS 1.3 handshake. On completion, it returns
|
|
* |ssl_hs_ok|. Otherwise, it returns a value corresponding to what operation
|
|
* is needed to progress. */
|
|
enum ssl_hs_wait_t (*do_tls13_handshake)(SSL_HANDSHAKE *hs);
|
|
|
|
/* wait contains the operation |do_tls13_handshake| is currently blocking on
|
|
* or |ssl_hs_ok| if none. */
|
|
enum ssl_hs_wait_t wait;
|
|
|
|
/* state contains one of the SSL3_ST_* values. */
|
|
int state;
|
|
|
|
/* next_state is used when SSL_ST_FLUSH_DATA is entered */
|
|
int next_state;
|
|
|
|
/* tls13_state is the internal state for the TLS 1.3 handshake. Its values
|
|
* depend on |do_tls13_handshake| but the starting state is always zero. */
|
|
int tls13_state;
|
|
|
|
size_t hash_len;
|
|
uint8_t secret[EVP_MAX_MD_SIZE];
|
|
uint8_t client_handshake_secret[EVP_MAX_MD_SIZE];
|
|
uint8_t server_handshake_secret[EVP_MAX_MD_SIZE];
|
|
uint8_t client_traffic_secret_0[EVP_MAX_MD_SIZE];
|
|
uint8_t server_traffic_secret_0[EVP_MAX_MD_SIZE];
|
|
|
|
union {
|
|
/* sent is a bitset where the bits correspond to elements of kExtensions
|
|
* in t1_lib.c. Each bit is set if that extension was sent in a
|
|
* ClientHello. It's not used by servers. */
|
|
uint32_t sent;
|
|
/* received is a bitset, like |sent|, but is used by servers to record
|
|
* which extensions were received from a client. */
|
|
uint32_t received;
|
|
} extensions;
|
|
|
|
union {
|
|
/* sent is a bitset where the bits correspond to elements of
|
|
* |client_custom_extensions| in the |SSL_CTX|. Each bit is set if that
|
|
* extension was sent in a ClientHello. It's not used by servers. */
|
|
uint16_t sent;
|
|
/* received is a bitset, like |sent|, but is used by servers to record
|
|
* which custom extensions were received from a client. The bits here
|
|
* correspond to |server_custom_extensions|. */
|
|
uint16_t received;
|
|
} custom_extensions;
|
|
|
|
/* retry_group is the group ID selected by the server in HelloRetryRequest in
|
|
* TLS 1.3. */
|
|
uint16_t retry_group;
|
|
|
|
/* ecdh_ctx is the current ECDH instance. */
|
|
SSL_ECDH_CTX ecdh_ctx;
|
|
|
|
/* cookie is the value of the cookie received from the server, if any. */
|
|
uint8_t *cookie;
|
|
size_t cookie_len;
|
|
|
|
/* key_share_bytes is the value of the previously sent KeyShare extension by
|
|
* the client in TLS 1.3. */
|
|
uint8_t *key_share_bytes;
|
|
size_t key_share_bytes_len;
|
|
|
|
/* public_key, for servers, is the key share to be sent to the client in TLS
|
|
* 1.3. */
|
|
uint8_t *public_key;
|
|
size_t public_key_len;
|
|
|
|
/* peer_sigalgs are the signature algorithms that the peer supports. These are
|
|
* taken from the contents of the signature algorithms extension for a server
|
|
* or from the CertificateRequest for a client. */
|
|
uint16_t *peer_sigalgs;
|
|
/* num_peer_sigalgs is the number of entries in |peer_sigalgs|. */
|
|
size_t num_peer_sigalgs;
|
|
|
|
/* peer_supported_group_list contains the supported group IDs advertised by
|
|
* the peer. This is only set on the server's end. The server does not
|
|
* advertise this extension to the client. */
|
|
uint16_t *peer_supported_group_list;
|
|
size_t peer_supported_group_list_len;
|
|
|
|
/* peer_key is the peer's ECDH key for a TLS 1.2 client. */
|
|
uint8_t *peer_key;
|
|
size_t peer_key_len;
|
|
|
|
/* server_params, in TLS 1.2, stores the ServerKeyExchange parameters to be
|
|
* signed while the signature is being computed. */
|
|
uint8_t *server_params;
|
|
size_t server_params_len;
|
|
|
|
/* peer_psk_identity_hint, on the client, is the psk_identity_hint sent by the
|
|
* server when using a TLS 1.2 PSK key exchange. */
|
|
char *peer_psk_identity_hint;
|
|
|
|
/* ca_names, on the client, contains the list of CAs received in a
|
|
* CertificateRequest message. */
|
|
STACK_OF(X509_NAME) *ca_names;
|
|
|
|
/* certificate_types, on the client, contains the set of certificate types
|
|
* received in a CertificateRequest message. */
|
|
uint8_t *certificate_types;
|
|
size_t num_certificate_types;
|
|
|
|
/* hostname, on the server, is the value of the SNI extension. */
|
|
char *hostname;
|
|
|
|
/* peer_pubkey is the public key parsed from the peer's leaf certificate. */
|
|
EVP_PKEY *peer_pubkey;
|
|
|
|
/* key_block is the record-layer key block for TLS 1.2 and earlier. */
|
|
uint8_t *key_block;
|
|
uint8_t key_block_len;
|
|
|
|
/* session_tickets_sent, in TLS 1.3, is the number of tickets the server has
|
|
* sent. */
|
|
uint8_t session_tickets_sent;
|
|
|
|
/* scts_requested is one if the SCT extension is in the ClientHello. */
|
|
unsigned scts_requested:1;
|
|
|
|
/* needs_psk_binder if the ClientHello has a placeholder PSK binder to be
|
|
* filled in. */
|
|
unsigned needs_psk_binder:1;
|
|
|
|
unsigned received_hello_retry_request:1;
|
|
|
|
/* accept_psk_mode stores whether the client's PSK mode is compatible with our
|
|
* preferences. */
|
|
unsigned accept_psk_mode:1;
|
|
|
|
/* cert_request is one if a client certificate was requested and zero
|
|
* otherwise. */
|
|
unsigned cert_request:1;
|
|
|
|
/* certificate_status_expected is one if OCSP stapling was negotiated and the
|
|
* server is expected to send a CertificateStatus message. (This is used on
|
|
* both the client and server sides.) */
|
|
unsigned certificate_status_expected:1;
|
|
|
|
/* ocsp_stapling_requested is one if a client requested OCSP stapling. */
|
|
unsigned ocsp_stapling_requested:1;
|
|
|
|
/* should_ack_sni is used by a server and indicates that the SNI extension
|
|
* should be echoed in the ServerHello. */
|
|
unsigned should_ack_sni:1;
|
|
|
|
/* in_false_start is one if there is a pending client handshake in False
|
|
* Start. The client may write data at this point. */
|
|
unsigned in_false_start:1;
|
|
|
|
/* next_proto_neg_seen is one of NPN was negotiated. */
|
|
unsigned next_proto_neg_seen:1;
|
|
|
|
/* ticket_expected is one if a TLS 1.2 NewSessionTicket message is to be sent
|
|
* or received. */
|
|
unsigned ticket_expected:1;
|
|
|
|
/* client_version is the value sent or received in the ClientHello version. */
|
|
uint16_t client_version;
|
|
} /* SSL_HANDSHAKE */;
|
|
|
|
SSL_HANDSHAKE *ssl_handshake_new(SSL *ssl);
|
|
|
|
/* ssl_handshake_free releases all memory associated with |hs|. */
|
|
void ssl_handshake_free(SSL_HANDSHAKE *hs);
|
|
|
|
/* tls13_handshake runs the TLS 1.3 handshake. It returns one on success and <=
|
|
* 0 on error. */
|
|
int tls13_handshake(SSL_HANDSHAKE *hs);
|
|
|
|
/* The following are implementations of |do_tls13_handshake| for the client and
|
|
* server. */
|
|
enum ssl_hs_wait_t tls13_client_handshake(SSL_HANDSHAKE *hs);
|
|
enum ssl_hs_wait_t tls13_server_handshake(SSL_HANDSHAKE *hs);
|
|
|
|
/* tls13_post_handshake processes a post-handshake message. It returns one on
|
|
* success and zero on failure. */
|
|
int tls13_post_handshake(SSL *ssl);
|
|
|
|
/* tls13_check_message_type checks if the current message has type |type|. If so
|
|
* it returns one. Otherwise, it sends an alert and returns zero. */
|
|
int tls13_check_message_type(SSL *ssl, int type);
|
|
|
|
int tls13_process_certificate(SSL_HANDSHAKE *hs, int allow_anonymous);
|
|
int tls13_process_certificate_verify(SSL_HANDSHAKE *hs);
|
|
int tls13_process_finished(SSL_HANDSHAKE *hs);
|
|
|
|
int tls13_prepare_certificate(SSL_HANDSHAKE *hs);
|
|
enum ssl_private_key_result_t tls13_prepare_certificate_verify(
|
|
SSL_HANDSHAKE *hs, int is_first_run);
|
|
int tls13_prepare_finished(SSL_HANDSHAKE *hs);
|
|
int tls13_process_new_session_ticket(SSL *ssl);
|
|
|
|
int ssl_ext_key_share_parse_serverhello(SSL_HANDSHAKE *hs, uint8_t **out_secret,
|
|
size_t *out_secret_len,
|
|
uint8_t *out_alert, CBS *contents);
|
|
int ssl_ext_key_share_parse_clienthello(SSL_HANDSHAKE *hs, int *out_found,
|
|
uint8_t **out_secret,
|
|
size_t *out_secret_len,
|
|
uint8_t *out_alert, CBS *contents);
|
|
int ssl_ext_key_share_add_serverhello(SSL_HANDSHAKE *hs, CBB *out);
|
|
|
|
int ssl_ext_pre_shared_key_parse_serverhello(SSL_HANDSHAKE *hs,
|
|
uint8_t *out_alert, CBS *contents);
|
|
int ssl_ext_pre_shared_key_parse_clienthello(SSL_HANDSHAKE *hs,
|
|
SSL_SESSION **out_session,
|
|
CBS *out_binders,
|
|
uint8_t *out_alert, CBS *contents);
|
|
int ssl_ext_pre_shared_key_add_serverhello(SSL_HANDSHAKE *hs, CBB *out);
|
|
|
|
/* ssl_is_sct_list_valid does a shallow parse of the SCT list in |contents| and
|
|
* returns one iff it's valid. */
|
|
int ssl_is_sct_list_valid(const CBS *contents);
|
|
|
|
int ssl_write_client_hello(SSL_HANDSHAKE *hs);
|
|
|
|
/* ssl_clear_tls13_state releases client state only needed for TLS 1.3. It
|
|
* should be called once the version is known to be TLS 1.2 or earlier. */
|
|
void ssl_clear_tls13_state(SSL_HANDSHAKE *hs);
|
|
|
|
enum ssl_cert_verify_context_t {
|
|
ssl_cert_verify_server,
|
|
ssl_cert_verify_client,
|
|
ssl_cert_verify_channel_id,
|
|
};
|
|
|
|
/* tls13_get_cert_verify_signature_input generates the message to be signed for
|
|
* TLS 1.3's CertificateVerify message. |cert_verify_context| determines the
|
|
* type of signature. It sets |*out| and |*out_len| to a newly allocated buffer
|
|
* containing the result. The caller must free it with |OPENSSL_free| to release
|
|
* it. This function returns one on success and zero on failure. */
|
|
int tls13_get_cert_verify_signature_input(
|
|
SSL *ssl, uint8_t **out, size_t *out_len,
|
|
enum ssl_cert_verify_context_t cert_verify_context);
|
|
|
|
/* ssl_negotiate_alpn negotiates the ALPN extension, if applicable. It returns
|
|
* one on successful negotiation or if nothing was negotiated. It returns zero
|
|
* and sets |*out_alert| to an alert on error. */
|
|
int ssl_negotiate_alpn(SSL_HANDSHAKE *hs, uint8_t *out_alert,
|
|
const SSL_CLIENT_HELLO *client_hello);
|
|
|
|
typedef struct {
|
|
uint16_t type;
|
|
int *out_present;
|
|
CBS *out_data;
|
|
} SSL_EXTENSION_TYPE;
|
|
|
|
/* ssl_parse_extensions parses a TLS extensions block out of |cbs| and advances
|
|
* it. It writes the parsed extensions to pointers denoted by |ext_types|. On
|
|
* success, it fills in the |out_present| and |out_data| fields and returns one.
|
|
* Otherwise, it sets |*out_alert| to an alert to send and returns zero. Unknown
|
|
* extensions are rejected unless |ignore_unknown| is 1. */
|
|
int ssl_parse_extensions(const CBS *cbs, uint8_t *out_alert,
|
|
const SSL_EXTENSION_TYPE *ext_types,
|
|
size_t num_ext_types, int ignore_unknown);
|
|
|
|
|
|
/* SSLKEYLOGFILE functions. */
|
|
|
|
/* ssl_log_rsa_client_key_exchange logs |premaster|, if logging is enabled for
|
|
* |ssl|. It returns one on success and zero on failure. The entry is identified
|
|
* by the first 8 bytes of |encrypted_premaster|. */
|
|
int ssl_log_rsa_client_key_exchange(const SSL *ssl,
|
|
const uint8_t *encrypted_premaster,
|
|
size_t encrypted_premaster_len,
|
|
const uint8_t *premaster,
|
|
size_t premaster_len);
|
|
|
|
/* ssl_log_secret logs |secret| with label |label|, if logging is enabled for
|
|
* |ssl|. It returns one on success and zero on failure. */
|
|
int ssl_log_secret(const SSL *ssl, const char *label, const uint8_t *secret,
|
|
size_t secret_len);
|
|
|
|
|
|
/* ClientHello functions. */
|
|
|
|
int ssl_client_hello_init(SSL *ssl, SSL_CLIENT_HELLO *out, const uint8_t *in,
|
|
size_t in_len);
|
|
|
|
int ssl_client_hello_get_extension(const SSL_CLIENT_HELLO *client_hello,
|
|
CBS *out, uint16_t extension_type);
|
|
|
|
int ssl_client_cipher_list_contains_cipher(const SSL_CLIENT_HELLO *client_hello,
|
|
uint16_t id);
|
|
|
|
|
|
/* GREASE. */
|
|
|
|
enum ssl_grease_index_t {
|
|
ssl_grease_cipher = 0,
|
|
ssl_grease_group,
|
|
ssl_grease_extension1,
|
|
ssl_grease_extension2,
|
|
ssl_grease_version,
|
|
ssl_grease_ticket_extension,
|
|
};
|
|
|
|
/* ssl_get_grease_value returns a GREASE value for |ssl|. For a given
|
|
* connection, the values for each index will be deterministic. This allows the
|
|
* same ClientHello be sent twice for a HelloRetryRequest or the same group be
|
|
* advertised in both supported_groups and key_shares. */
|
|
uint16_t ssl_get_grease_value(const SSL *ssl, enum ssl_grease_index_t index);
|
|
|
|
|
|
/* Signature algorithms. */
|
|
|
|
/* tls1_parse_peer_sigalgs parses |sigalgs| as the list of peer signature
|
|
* algorithms and saves them on |hs|. It returns one on success and zero on
|
|
* error. */
|
|
int tls1_parse_peer_sigalgs(SSL_HANDSHAKE *hs, const CBS *sigalgs);
|
|
|
|
/* tls1_choose_signature_algorithm sets |*out| to a signature algorithm for use
|
|
* with |hs|'s private key based on the peer's preferences and the algorithms
|
|
* supported. It returns one on success and zero on error. */
|
|
int tls1_choose_signature_algorithm(SSL_HANDSHAKE *hs, uint16_t *out);
|
|
|
|
/* tls12_get_verify_sigalgs sets |*out| to the signature algorithms acceptable
|
|
* for the peer signature and returns the length of the list. */
|
|
size_t tls12_get_verify_sigalgs(const SSL *ssl, const uint16_t **out);
|
|
|
|
/* tls12_check_peer_sigalg checks if |sigalg| is acceptable for the peer
|
|
* signature. It returns one on success and zero on error, setting |*out_alert|
|
|
* to an alert to send. */
|
|
int tls12_check_peer_sigalg(SSL *ssl, int *out_alert, uint16_t sigalg);
|
|
|
|
|
|
/* Underdocumented functions.
|
|
*
|
|
* Functions below here haven't been touched up and may be underdocumented. */
|
|
|
|
#define TLSEXT_CHANNEL_ID_SIZE 128
|
|
|
|
/* From RFC4492, used in encoding the curve type in ECParameters */
|
|
#define NAMED_CURVE_TYPE 3
|
|
|
|
enum ssl_hash_message_t {
|
|
ssl_dont_hash_message,
|
|
ssl_hash_message,
|
|
};
|
|
|
|
typedef struct cert_st {
|
|
EVP_PKEY *privatekey;
|
|
X509 *x509_leaf;
|
|
STACK_OF(X509) *x509_chain;
|
|
|
|
/* key_method, if non-NULL, is a set of callbacks to call for private key
|
|
* operations. */
|
|
const SSL_PRIVATE_KEY_METHOD *key_method;
|
|
|
|
/* For clients the following masks are of *disabled* key and auth algorithms
|
|
* based on the current configuration.
|
|
*
|
|
* TODO(davidben): Remove these. They get checked twice: when sending the
|
|
* ClientHello and when processing the ServerHello. */
|
|
uint32_t mask_k;
|
|
uint32_t mask_a;
|
|
|
|
DH *dh_tmp;
|
|
DH *(*dh_tmp_cb)(SSL *ssl, int is_export, int keysize);
|
|
|
|
/* sigalgs, if non-NULL, is the set of signature algorithms supported by
|
|
* |privatekey| in decreasing order of preference. */
|
|
uint16_t *sigalgs;
|
|
size_t num_sigalgs;
|
|
|
|
/* Certificate setup callback: if set is called whenever a
|
|
* certificate may be required (client or server). the callback
|
|
* can then examine any appropriate parameters and setup any
|
|
* certificates required. This allows advanced applications
|
|
* to select certificates on the fly: for example based on
|
|
* supported signature algorithms or curves. */
|
|
int (*cert_cb)(SSL *ssl, void *arg);
|
|
void *cert_cb_arg;
|
|
|
|
/* Optional X509_STORE for certificate validation. If NULL the parent SSL_CTX
|
|
* store is used instead. */
|
|
X509_STORE *verify_store;
|
|
} CERT;
|
|
|
|
/* SSL_METHOD is a compatibility structure to support the legacy version-locked
|
|
* methods. */
|
|
struct ssl_method_st {
|
|
/* version, if non-zero, is the only protocol version acceptable to an
|
|
* SSL_CTX initialized from this method. */
|
|
uint16_t version;
|
|
/* method is the underlying SSL_PROTOCOL_METHOD that initializes the
|
|
* SSL_CTX. */
|
|
const SSL_PROTOCOL_METHOD *method;
|
|
};
|
|
|
|
/* Used to hold functions for SSLv2 or SSLv3/TLSv1 functions */
|
|
struct ssl_protocol_method_st {
|
|
/* is_dtls is one if the protocol is DTLS and zero otherwise. */
|
|
char is_dtls;
|
|
/* min_version is the minimum implemented version. */
|
|
uint16_t min_version;
|
|
/* max_version is the maximum implemented version. */
|
|
uint16_t max_version;
|
|
/* version_from_wire maps |wire_version| to a protocol version. On success, it
|
|
* sets |*out_version| to the result and returns one. If the version is
|
|
* unknown, it returns zero. */
|
|
int (*version_from_wire)(uint16_t *out_version, uint16_t wire_version);
|
|
/* version_to_wire maps |version| to the wire representation. It is an error
|
|
* to call it with an invalid version. */
|
|
uint16_t (*version_to_wire)(uint16_t version);
|
|
int (*ssl_new)(SSL *ssl);
|
|
void (*ssl_free)(SSL *ssl);
|
|
/* ssl_get_message reads the next handshake message. If |msg_type| is not -1,
|
|
* the message must have the specified type. On success, it returns one and
|
|
* sets |ssl->s3->tmp.message_type|, |ssl->init_msg|, and |ssl->init_num|.
|
|
* Otherwise, it returns <= 0. */
|
|
int (*ssl_get_message)(SSL *ssl, int msg_type,
|
|
enum ssl_hash_message_t hash_message);
|
|
/* get_current_message sets |*out| to the current handshake message. This
|
|
* includes the protocol-specific message header. */
|
|
void (*get_current_message)(const SSL *ssl, CBS *out);
|
|
/* release_current_message is called to release the current handshake message.
|
|
* If |free_buffer| is one, buffers will also be released. */
|
|
void (*release_current_message)(SSL *ssl, int free_buffer);
|
|
/* read_app_data reads up to |len| bytes of application data into |buf|. On
|
|
* success, it returns the number of bytes read. Otherwise, it returns <= 0
|
|
* and sets |*out_got_handshake| to whether the failure was due to a
|
|
* post-handshake handshake message. If so, it fills in the current message as
|
|
* in |ssl_get_message|. */
|
|
int (*read_app_data)(SSL *ssl, int *out_got_handshake, uint8_t *buf, int len,
|
|
int peek);
|
|
int (*read_change_cipher_spec)(SSL *ssl);
|
|
void (*read_close_notify)(SSL *ssl);
|
|
int (*write_app_data)(SSL *ssl, const void *buf_, int len);
|
|
int (*dispatch_alert)(SSL *ssl);
|
|
/* supports_cipher returns one if |cipher| is supported by this protocol and
|
|
* zero otherwise. */
|
|
int (*supports_cipher)(const SSL_CIPHER *cipher);
|
|
/* init_message begins a new handshake message of type |type|. |cbb| is the
|
|
* root CBB to be passed into |finish_message|. |*body| is set to a child CBB
|
|
* the caller should write to. It returns one on success and zero on error. */
|
|
int (*init_message)(SSL *ssl, CBB *cbb, CBB *body, uint8_t type);
|
|
/* finish_message finishes a handshake message. It sets |*out_msg| to a
|
|
* newly-allocated buffer with the serialized message. The caller must
|
|
* release it with |OPENSSL_free| when done. It returns one on success and
|
|
* zero on error. */
|
|
int (*finish_message)(SSL *ssl, CBB *cbb, uint8_t **out_msg, size_t *out_len);
|
|
/* queue_message queues a handshake message and prepares it to be written. It
|
|
* takes ownership of |msg| and releases it with |OPENSSL_free| when done. It
|
|
* returns one on success and zero on error. */
|
|
int (*queue_message)(SSL *ssl, uint8_t *msg, size_t len);
|
|
/* write_message writes the next message to the transport. It returns one on
|
|
* success and <= 0 on error. */
|
|
int (*write_message)(SSL *ssl);
|
|
/* send_change_cipher_spec sends a ChangeCipherSpec message. */
|
|
int (*send_change_cipher_spec)(SSL *ssl);
|
|
/* expect_flight is called when the handshake expects a flight of messages from
|
|
* the peer. */
|
|
void (*expect_flight)(SSL *ssl);
|
|
/* received_flight is called when the handshake has received a flight of
|
|
* messages from the peer. */
|
|
void (*received_flight)(SSL *ssl);
|
|
/* set_read_state sets |ssl|'s read cipher state to |aead_ctx|. It takes
|
|
* ownership of |aead_ctx|. It returns one on success and zero if changing the
|
|
* read state is forbidden at this point. */
|
|
int (*set_read_state)(SSL *ssl, SSL_AEAD_CTX *aead_ctx);
|
|
/* set_write_state sets |ssl|'s write cipher state to |aead_ctx|. It takes
|
|
* ownership of |aead_ctx|. It returns one on success and zero if changing the
|
|
* write state is forbidden at this point. */
|
|
int (*set_write_state)(SSL *ssl, SSL_AEAD_CTX *aead_ctx);
|
|
};
|
|
|
|
/* This is for the SSLv3/TLSv1.0 differences in crypto/hash stuff It is a bit
|
|
* of a mess of functions, but hell, think of it as an opaque structure. */
|
|
typedef struct ssl3_enc_method {
|
|
/* prf computes the PRF function for |ssl|. It writes |out_len| bytes to
|
|
* |out|, using |secret| as the secret and |label| as the label. |seed1| and
|
|
* |seed2| are concatenated to form the seed parameter. It returns one on
|
|
* success and zero on failure. */
|
|
int (*prf)(const SSL *ssl, uint8_t *out, size_t out_len,
|
|
const uint8_t *secret, size_t secret_len, const char *label,
|
|
size_t label_len, const uint8_t *seed1, size_t seed1_len,
|
|
const uint8_t *seed2, size_t seed2_len);
|
|
int (*final_finish_mac)(SSL *ssl, int from_server, uint8_t *out);
|
|
} SSL3_ENC_METHOD;
|
|
|
|
typedef struct ssl3_record_st {
|
|
/* type is the record type. */
|
|
uint8_t type;
|
|
/* length is the number of unconsumed bytes in the record. */
|
|
uint16_t length;
|
|
/* data is a non-owning pointer to the first unconsumed byte of the record. */
|
|
uint8_t *data;
|
|
} SSL3_RECORD;
|
|
|
|
typedef struct ssl3_buffer_st {
|
|
/* buf is the memory allocated for this buffer. */
|
|
uint8_t *buf;
|
|
/* offset is the offset into |buf| which the buffer contents start at. */
|
|
uint16_t offset;
|
|
/* len is the length of the buffer contents from |buf| + |offset|. */
|
|
uint16_t len;
|
|
/* cap is how much memory beyond |buf| + |offset| is available. */
|
|
uint16_t cap;
|
|
} SSL3_BUFFER;
|
|
|
|
/* An ssl_shutdown_t describes the shutdown state of one end of the connection,
|
|
* whether it is alive or has been shutdown via close_notify or fatal alert. */
|
|
enum ssl_shutdown_t {
|
|
ssl_shutdown_none = 0,
|
|
ssl_shutdown_close_notify = 1,
|
|
ssl_shutdown_fatal_alert = 2,
|
|
};
|
|
|
|
typedef struct ssl3_state_st {
|
|
uint8_t read_sequence[8];
|
|
uint8_t write_sequence[8];
|
|
|
|
uint8_t server_random[SSL3_RANDOM_SIZE];
|
|
uint8_t client_random[SSL3_RANDOM_SIZE];
|
|
|
|
/* read_buffer holds data from the transport to be processed. */
|
|
SSL3_BUFFER read_buffer;
|
|
/* write_buffer holds data to be written to the transport. */
|
|
SSL3_BUFFER write_buffer;
|
|
|
|
SSL3_RECORD rrec; /* each decoded record goes in here */
|
|
|
|
/* partial write - check the numbers match */
|
|
unsigned int wnum; /* number of bytes sent so far */
|
|
int wpend_tot; /* number bytes written */
|
|
int wpend_type;
|
|
int wpend_ret; /* number of bytes submitted */
|
|
const uint8_t *wpend_buf;
|
|
|
|
/* handshake_buffer, if non-NULL, contains the handshake transcript. */
|
|
BUF_MEM *handshake_buffer;
|
|
/* handshake_hash, if initialized with an |EVP_MD|, maintains the handshake
|
|
* hash. For TLS 1.1 and below, it is the SHA-1 half. */
|
|
EVP_MD_CTX handshake_hash;
|
|
/* handshake_md5, if initialized with an |EVP_MD|, maintains the MD5 half of
|
|
* the handshake hash for TLS 1.1 and below. */
|
|
EVP_MD_CTX handshake_md5;
|
|
|
|
/* recv_shutdown is the shutdown state for the receive half of the
|
|
* connection. */
|
|
enum ssl_shutdown_t recv_shutdown;
|
|
|
|
/* recv_shutdown is the shutdown state for the send half of the connection. */
|
|
enum ssl_shutdown_t send_shutdown;
|
|
|
|
int alert_dispatch;
|
|
|
|
int total_renegotiations;
|
|
|
|
/* early_data_skipped is the amount of early data that has been skipped by the
|
|
* record layer. */
|
|
uint16_t early_data_skipped;
|
|
|
|
/* empty_record_count is the number of consecutive empty records received. */
|
|
uint8_t empty_record_count;
|
|
|
|
/* warning_alert_count is the number of consecutive warning alerts
|
|
* received. */
|
|
uint8_t warning_alert_count;
|
|
|
|
/* key_update_count is the number of consecutive KeyUpdates received. */
|
|
uint8_t key_update_count;
|
|
|
|
/* skip_early_data instructs the record layer to skip unexpected early data
|
|
* messages when 0RTT is rejected. */
|
|
unsigned skip_early_data:1;
|
|
|
|
/* have_version is true if the connection's final version is known. Otherwise
|
|
* the version has not been negotiated yet. */
|
|
unsigned have_version:1;
|
|
|
|
/* v2_hello_done is true if the peer's V2ClientHello, if any, has been handled
|
|
* and future messages should use the record layer. */
|
|
unsigned v2_hello_done:1;
|
|
|
|
/* initial_handshake_complete is true if the initial handshake has
|
|
* completed. */
|
|
unsigned initial_handshake_complete:1;
|
|
|
|
/* session_reused indicates whether a session was resumed. */
|
|
unsigned session_reused:1;
|
|
|
|
unsigned send_connection_binding:1;
|
|
|
|
/* In a client, this means that the server supported Channel ID and that a
|
|
* Channel ID was sent. In a server it means that we echoed support for
|
|
* Channel IDs and that tlsext_channel_id will be valid after the
|
|
* handshake. */
|
|
unsigned tlsext_channel_id_valid:1;
|
|
|
|
/* short_header is one if https://github.com/tlswg/tls13-spec/pull/762 has
|
|
* been negotiated. */
|
|
unsigned short_header:1;
|
|
|
|
uint8_t send_alert[2];
|
|
|
|
/* pending_message is the current outgoing handshake message. */
|
|
uint8_t *pending_message;
|
|
uint32_t pending_message_len;
|
|
|
|
/* aead_read_ctx is the current read cipher state. */
|
|
SSL_AEAD_CTX *aead_read_ctx;
|
|
|
|
/* aead_write_ctx is the current write cipher state. */
|
|
SSL_AEAD_CTX *aead_write_ctx;
|
|
|
|
/* enc_method is the method table corresponding to the current protocol
|
|
* version. */
|
|
const SSL3_ENC_METHOD *enc_method;
|
|
|
|
/* hs is the handshake state for the current handshake or NULL if there isn't
|
|
* one. */
|
|
SSL_HANDSHAKE *hs;
|
|
|
|
uint8_t write_traffic_secret[EVP_MAX_MD_SIZE];
|
|
uint8_t read_traffic_secret[EVP_MAX_MD_SIZE];
|
|
uint8_t exporter_secret[EVP_MAX_MD_SIZE];
|
|
uint8_t write_traffic_secret_len;
|
|
uint8_t read_traffic_secret_len;
|
|
uint8_t exporter_secret_len;
|
|
|
|
/* Connection binding to prevent renegotiation attacks */
|
|
uint8_t previous_client_finished[12];
|
|
uint8_t previous_client_finished_len;
|
|
uint8_t previous_server_finished_len;
|
|
uint8_t previous_server_finished[12];
|
|
|
|
/* State pertaining to the pending handshake.
|
|
*
|
|
* TODO(davidben): Move everything not needed after the handshake completes to
|
|
* |hs| and remove this. */
|
|
struct {
|
|
/* used to hold the new cipher we are going to use */
|
|
const SSL_CIPHER *new_cipher;
|
|
|
|
int message_type;
|
|
|
|
int reuse_message;
|
|
|
|
uint8_t new_mac_secret_len;
|
|
uint8_t new_key_len;
|
|
uint8_t new_fixed_iv_len;
|
|
|
|
/* extended_master_secret indicates whether the extended master secret
|
|
* computation is used in this handshake. Note that this is different from
|
|
* whether it was used for the current session. If this is a resumption
|
|
* handshake then EMS might be negotiated in the client and server hello
|
|
* messages, but it doesn't matter if the session that's being resumed
|
|
* didn't use it to create the master secret initially. */
|
|
char extended_master_secret;
|
|
} tmp;
|
|
|
|
/* new_session is the new mutable session being established by the current
|
|
* handshake. It should not be cached. */
|
|
SSL_SESSION *new_session;
|
|
|
|
/* established_session is the session established by the connection. This
|
|
* session is only filled upon the completion of the handshake and is
|
|
* immutable. */
|
|
SSL_SESSION *established_session;
|
|
|
|
/* Next protocol negotiation. For the client, this is the protocol that we
|
|
* sent in NextProtocol and is set when handling ServerHello extensions.
|
|
*
|
|
* For a server, this is the client's selected_protocol from NextProtocol and
|
|
* is set when handling the NextProtocol message, before the Finished
|
|
* message. */
|
|
uint8_t *next_proto_negotiated;
|
|
size_t next_proto_negotiated_len;
|
|
|
|
/* ALPN information
|
|
* (we are in the process of transitioning from NPN to ALPN.) */
|
|
|
|
/* In a server these point to the selected ALPN protocol after the
|
|
* ClientHello has been processed. In a client these contain the protocol
|
|
* that the server selected once the ServerHello has been processed. */
|
|
uint8_t *alpn_selected;
|
|
size_t alpn_selected_len;
|
|
|
|
/* For a server:
|
|
* If |tlsext_channel_id_valid| is true, then this contains the
|
|
* verified Channel ID from the client: a P256 point, (x,y), where
|
|
* each are big-endian values. */
|
|
uint8_t tlsext_channel_id[64];
|
|
} SSL3_STATE;
|
|
|
|
/* lengths of messages */
|
|
#define DTLS1_COOKIE_LENGTH 256
|
|
|
|
#define DTLS1_RT_HEADER_LENGTH 13
|
|
|
|
#define DTLS1_HM_HEADER_LENGTH 12
|
|
|
|
#define DTLS1_CCS_HEADER_LENGTH 1
|
|
|
|
#define DTLS1_AL_HEADER_LENGTH 2
|
|
|
|
struct hm_header_st {
|
|
uint8_t type;
|
|
uint32_t msg_len;
|
|
uint16_t seq;
|
|
uint32_t frag_off;
|
|
uint32_t frag_len;
|
|
};
|
|
|
|
/* An hm_fragment is an incoming DTLS message, possibly not yet assembled. */
|
|
typedef struct hm_fragment_st {
|
|
/* type is the type of the message. */
|
|
uint8_t type;
|
|
/* seq is the sequence number of this message. */
|
|
uint16_t seq;
|
|
/* msg_len is the length of the message body. */
|
|
uint32_t msg_len;
|
|
/* data is a pointer to the message, including message header. It has length
|
|
* |DTLS1_HM_HEADER_LENGTH| + |msg_len|. */
|
|
uint8_t *data;
|
|
/* reassembly is a bitmask of |msg_len| bits corresponding to which parts of
|
|
* the message have been received. It is NULL if the message is complete. */
|
|
uint8_t *reassembly;
|
|
} hm_fragment;
|
|
|
|
typedef struct dtls1_state_st {
|
|
/* send_cookie is true if we are resending the ClientHello
|
|
* with a cookie from a HelloVerifyRequest. */
|
|
unsigned int send_cookie;
|
|
|
|
uint8_t cookie[DTLS1_COOKIE_LENGTH];
|
|
size_t cookie_len;
|
|
|
|
/* The current data and handshake epoch. This is initially undefined, and
|
|
* starts at zero once the initial handshake is completed. */
|
|
uint16_t r_epoch;
|
|
uint16_t w_epoch;
|
|
|
|
/* records being received in the current epoch */
|
|
DTLS1_BITMAP bitmap;
|
|
|
|
uint16_t handshake_write_seq;
|
|
uint16_t handshake_read_seq;
|
|
|
|
/* save last sequence number for retransmissions */
|
|
uint8_t last_write_sequence[8];
|
|
|
|
/* incoming_messages is a ring buffer of incoming handshake messages that have
|
|
* yet to be processed. The front of the ring buffer is message number
|
|
* |handshake_read_seq|, at position |handshake_read_seq| %
|
|
* |SSL_MAX_HANDSHAKE_FLIGHT|. */
|
|
hm_fragment *incoming_messages[SSL_MAX_HANDSHAKE_FLIGHT];
|
|
|
|
/* outgoing_messages is the queue of outgoing messages from the last handshake
|
|
* flight. */
|
|
DTLS_OUTGOING_MESSAGE outgoing_messages[SSL_MAX_HANDSHAKE_FLIGHT];
|
|
uint8_t outgoing_messages_len;
|
|
|
|
unsigned int mtu; /* max DTLS packet size */
|
|
|
|
/* num_timeouts is the number of times the retransmit timer has fired since
|
|
* the last time it was reset. */
|
|
unsigned int num_timeouts;
|
|
|
|
/* Indicates when the last handshake msg or heartbeat sent will
|
|
* timeout. */
|
|
struct timeval next_timeout;
|
|
|
|
/* timeout_duration_ms is the timeout duration in milliseconds. */
|
|
unsigned timeout_duration_ms;
|
|
} DTLS1_STATE;
|
|
|
|
extern const SSL3_ENC_METHOD TLSv1_enc_data;
|
|
extern const SSL3_ENC_METHOD SSLv3_enc_data;
|
|
|
|
/* From draft-ietf-tls-tls13-18, used in determining PSK modes. */
|
|
#define SSL_PSK_KE 0x0
|
|
#define SSL_PSK_DHE_KE 0x1
|
|
|
|
/* From draft-ietf-tls-tls13-16, used in determining whether to respond with a
|
|
* KeyUpdate. */
|
|
#define SSL_KEY_UPDATE_NOT_REQUESTED 0
|
|
#define SSL_KEY_UPDATE_REQUESTED 1
|
|
|
|
CERT *ssl_cert_new(void);
|
|
CERT *ssl_cert_dup(CERT *cert);
|
|
void ssl_cert_clear_certs(CERT *c);
|
|
void ssl_cert_free(CERT *c);
|
|
int ssl_get_new_session(SSL_HANDSHAKE *hs, int is_server);
|
|
int ssl_encrypt_ticket(SSL *ssl, CBB *out, const SSL_SESSION *session);
|
|
|
|
/* ssl_session_is_context_valid returns one if |session|'s session ID context
|
|
* matches the one set on |ssl| and zero otherwise. */
|
|
int ssl_session_is_context_valid(const SSL *ssl, const SSL_SESSION *session);
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|
|
|
/* ssl_session_is_time_valid returns one if |session| is still valid and zero if
|
|
* it has expired. */
|
|
int ssl_session_is_time_valid(const SSL *ssl, const SSL_SESSION *session);
|
|
|
|
/* ssl_session_is_resumable returns one if |session| is resumable for |ssl| and
|
|
* zero otherwise. */
|
|
int ssl_session_is_resumable(const SSL *ssl, const SSL_SESSION *session);
|
|
|
|
void ssl_set_session(SSL *ssl, SSL_SESSION *session);
|
|
|
|
enum ssl_session_result_t {
|
|
ssl_session_success,
|
|
ssl_session_error,
|
|
ssl_session_retry,
|
|
};
|
|
|
|
/* ssl_get_prev_session looks up the previous session based on |client_hello|.
|
|
* On success, it sets |*out_session| to the session or NULL if none was found.
|
|
* If the session could not be looked up synchronously, it returns
|
|
* |ssl_session_retry| and should be called again. Otherwise, it returns
|
|
* |ssl_session_error|. */
|
|
enum ssl_session_result_t ssl_get_prev_session(
|
|
SSL *ssl, SSL_SESSION **out_session, int *out_tickets_supported,
|
|
int *out_renew_ticket, const SSL_CLIENT_HELLO *client_hello);
|
|
|
|
/* The following flags determine which parts of the session are duplicated. */
|
|
#define SSL_SESSION_DUP_AUTH_ONLY 0x0
|
|
#define SSL_SESSION_INCLUDE_TICKET 0x1
|
|
#define SSL_SESSION_INCLUDE_NONAUTH 0x2
|
|
#define SSL_SESSION_DUP_ALL \
|
|
(SSL_SESSION_INCLUDE_TICKET | SSL_SESSION_INCLUDE_NONAUTH)
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|
|
|
/* SSL_SESSION_dup returns a newly-allocated |SSL_SESSION| with a copy of the
|
|
* fields in |session| or NULL on error. The new session is non-resumable and
|
|
* must be explicitly marked resumable once it has been filled in. */
|
|
OPENSSL_EXPORT SSL_SESSION *SSL_SESSION_dup(SSL_SESSION *session,
|
|
int dup_flags);
|
|
|
|
/* ssl_session_refresh_time updates |session|'s start time to the current time,
|
|
* adjusting the timeout so the expiration time is unchanged. */
|
|
void ssl_session_refresh_time(SSL *ssl, SSL_SESSION *session);
|
|
|
|
void ssl_cipher_preference_list_free(
|
|
struct ssl_cipher_preference_list_st *cipher_list);
|
|
|
|
/* ssl_get_cipher_preferences returns the cipher preference list for TLS 1.2 and
|
|
* below. */
|
|
const struct ssl_cipher_preference_list_st *ssl_get_cipher_preferences(
|
|
const SSL *ssl);
|
|
|
|
int ssl_verify_cert_chain(SSL *ssl, long *out_verify_result,
|
|
STACK_OF(X509) * cert_chain);
|
|
void ssl_update_cache(SSL_HANDSHAKE *hs, int mode);
|
|
|
|
int ssl_verify_alarm_type(long type);
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|
|
|
int ssl3_get_finished(SSL_HANDSHAKE *hs);
|
|
int ssl3_send_change_cipher_spec(SSL *ssl);
|
|
int ssl3_send_alert(SSL *ssl, int level, int desc);
|
|
int ssl3_get_message(SSL *ssl, int msg_type,
|
|
enum ssl_hash_message_t hash_message);
|
|
void ssl3_get_current_message(const SSL *ssl, CBS *out);
|
|
void ssl3_release_current_message(SSL *ssl, int free_buffer);
|
|
|
|
/* ssl3_cert_verify_hash writes the SSL 3.0 CertificateVerify hash into the
|
|
* bytes pointed to by |out| and writes the number of bytes to |*out_len|. |out|
|
|
* must have room for |EVP_MAX_MD_SIZE| bytes. It sets |*out_md| to the hash
|
|
* function used. It returns one on success and zero on failure. */
|
|
int ssl3_cert_verify_hash(SSL *ssl, const EVP_MD **out_md, uint8_t *out,
|
|
size_t *out_len, uint16_t signature_algorithm);
|
|
|
|
int ssl3_send_finished(SSL_HANDSHAKE *hs, int a, int b);
|
|
int ssl3_dispatch_alert(SSL *ssl);
|
|
int ssl3_read_app_data(SSL *ssl, int *out_got_handshake, uint8_t *buf, int len,
|
|
int peek);
|
|
int ssl3_read_change_cipher_spec(SSL *ssl);
|
|
void ssl3_read_close_notify(SSL *ssl);
|
|
int ssl3_read_handshake_bytes(SSL *ssl, uint8_t *buf, int len);
|
|
int ssl3_write_app_data(SSL *ssl, const void *buf, int len);
|
|
int ssl3_write_bytes(SSL *ssl, int type, const void *buf, int len);
|
|
int ssl3_output_cert_chain(SSL *ssl);
|
|
|
|
int ssl3_new(SSL *ssl);
|
|
void ssl3_free(SSL *ssl);
|
|
int ssl3_accept(SSL_HANDSHAKE *hs);
|
|
int ssl3_connect(SSL_HANDSHAKE *hs);
|
|
|
|
int ssl3_init_message(SSL *ssl, CBB *cbb, CBB *body, uint8_t type);
|
|
int ssl3_finish_message(SSL *ssl, CBB *cbb, uint8_t **out_msg, size_t *out_len);
|
|
int ssl3_queue_message(SSL *ssl, uint8_t *msg, size_t len);
|
|
int ssl3_write_message(SSL *ssl);
|
|
|
|
int dtls1_init_message(SSL *ssl, CBB *cbb, CBB *body, uint8_t type);
|
|
int dtls1_finish_message(SSL *ssl, CBB *cbb, uint8_t **out_msg,
|
|
size_t *out_len);
|
|
int dtls1_queue_message(SSL *ssl, uint8_t *msg, size_t len);
|
|
int dtls1_write_message(SSL *ssl);
|
|
|
|
/* ssl_complete_message calls |finish_message| and |queue_message| on |cbb| to
|
|
* queue the message for writing. */
|
|
int ssl_complete_message(SSL *ssl, CBB *cbb);
|
|
|
|
/* ssl_hash_current_message incorporates the current handshake message into the
|
|
* handshake hash. It returns one on success and zero on allocation failure. */
|
|
int ssl_hash_current_message(SSL *ssl);
|
|
|
|
/* dtls1_get_record reads a new input record. On success, it places it in
|
|
* |ssl->s3->rrec| and returns one. Otherwise it returns <= 0 on error or if
|
|
* more data is needed. */
|
|
int dtls1_get_record(SSL *ssl);
|
|
|
|
int dtls1_read_app_data(SSL *ssl, int *out_got_handshake, uint8_t *buf, int len,
|
|
int peek);
|
|
int dtls1_read_change_cipher_spec(SSL *ssl);
|
|
void dtls1_read_close_notify(SSL *ssl);
|
|
|
|
int dtls1_write_app_data(SSL *ssl, const void *buf, int len);
|
|
|
|
/* dtls1_write_record sends a record. It returns one on success and <= 0 on
|
|
* error. */
|
|
int dtls1_write_record(SSL *ssl, int type, const uint8_t *buf, size_t len,
|
|
enum dtls1_use_epoch_t use_epoch);
|
|
|
|
int dtls1_send_change_cipher_spec(SSL *ssl);
|
|
int dtls1_send_finished(SSL *ssl, int a, int b, const char *sender, int slen);
|
|
int dtls1_retransmit_outgoing_messages(SSL *ssl);
|
|
void dtls1_clear_record_buffer(SSL *ssl);
|
|
int dtls1_parse_fragment(CBS *cbs, struct hm_header_st *out_hdr,
|
|
CBS *out_body);
|
|
int dtls1_check_timeout_num(SSL *ssl);
|
|
int dtls1_handshake_write(SSL *ssl);
|
|
|
|
void dtls1_start_timer(SSL *ssl);
|
|
void dtls1_stop_timer(SSL *ssl);
|
|
int dtls1_is_timer_expired(SSL *ssl);
|
|
void dtls1_double_timeout(SSL *ssl);
|
|
unsigned int dtls1_min_mtu(void);
|
|
|
|
int dtls1_new(SSL *ssl);
|
|
int dtls1_accept(SSL *ssl);
|
|
int dtls1_connect(SSL *ssl);
|
|
void dtls1_free(SSL *ssl);
|
|
|
|
int dtls1_get_message(SSL *ssl, int mt, enum ssl_hash_message_t hash_message);
|
|
void dtls1_get_current_message(const SSL *ssl, CBS *out);
|
|
void dtls1_release_current_message(SSL *ssl, int free_buffer);
|
|
int dtls1_dispatch_alert(SSL *ssl);
|
|
|
|
/* ssl_is_wbio_buffered returns one if |ssl|'s write BIO is buffered and zero
|
|
* otherwise. */
|
|
int ssl_is_wbio_buffered(const SSL *ssl);
|
|
|
|
int ssl_init_wbio_buffer(SSL *ssl);
|
|
void ssl_free_wbio_buffer(SSL *ssl);
|
|
|
|
int tls1_change_cipher_state(SSL_HANDSHAKE *hs, int which);
|
|
int tls1_handshake_digest(SSL *ssl, uint8_t *out, size_t out_len);
|
|
int tls1_generate_master_secret(SSL *ssl, uint8_t *out, const uint8_t *premaster,
|
|
size_t premaster_len);
|
|
|
|
/* tls1_get_grouplist sets |*out_group_ids| and |*out_group_ids_len| to the
|
|
* locally-configured group preference list. */
|
|
void tls1_get_grouplist(SSL *ssl, const uint16_t **out_group_ids,
|
|
size_t *out_group_ids_len);
|
|
|
|
/* tls1_check_group_id returns one if |group_id| is consistent with
|
|
* locally-configured group preferences. */
|
|
int tls1_check_group_id(SSL *ssl, uint16_t group_id);
|
|
|
|
/* tls1_get_shared_group sets |*out_group_id| to the first preferred shared
|
|
* group between client and server preferences and returns one. If none may be
|
|
* found, it returns zero. */
|
|
int tls1_get_shared_group(SSL_HANDSHAKE *hs, uint16_t *out_group_id);
|
|
|
|
/* tls1_set_curves converts the array of |ncurves| NIDs pointed to by |curves|
|
|
* into a newly allocated array of TLS group IDs. On success, the function
|
|
* returns one and writes the array to |*out_group_ids| and its size to
|
|
* |*out_group_ids_len|. Otherwise, it returns zero. */
|
|
int tls1_set_curves(uint16_t **out_group_ids, size_t *out_group_ids_len,
|
|
const int *curves, size_t ncurves);
|
|
|
|
/* tls1_set_curves_list converts the string of curves pointed to by |curves|
|
|
* into a newly allocated array of TLS group IDs. On success, the function
|
|
* returns one and writes the array to |*out_group_ids| and its size to
|
|
* |*out_group_ids_len|. Otherwise, it returns zero. */
|
|
int tls1_set_curves_list(uint16_t **out_group_ids, size_t *out_group_ids_len,
|
|
const char *curves);
|
|
|
|
/* ssl_add_clienthello_tlsext writes ClientHello extensions to |out|. It
|
|
* returns one on success and zero on failure. The |header_len| argument is the
|
|
* length of the ClientHello written so far and is used to compute the padding
|
|
* length. (It does not include the record header.) */
|
|
int ssl_add_clienthello_tlsext(SSL_HANDSHAKE *hs, CBB *out, size_t header_len);
|
|
|
|
int ssl_add_serverhello_tlsext(SSL_HANDSHAKE *hs, CBB *out);
|
|
int ssl_parse_clienthello_tlsext(SSL_HANDSHAKE *hs,
|
|
const SSL_CLIENT_HELLO *client_hello);
|
|
int ssl_parse_serverhello_tlsext(SSL_HANDSHAKE *hs, CBS *cbs);
|
|
|
|
#define tlsext_tick_md EVP_sha256
|
|
|
|
/* tls_process_ticket processes a session ticket from the client. On success,
|
|
* it sets |*out_session| to the decrypted session or NULL if the ticket was
|
|
* rejected. If the ticket was valid, it sets |*out_renew_ticket| to whether
|
|
* the ticket should be renewed. It returns one on success and zero on fatal
|
|
* error. */
|
|
int tls_process_ticket(SSL *ssl, SSL_SESSION **out_session,
|
|
int *out_renew_ticket, const uint8_t *ticket,
|
|
size_t ticket_len, const uint8_t *session_id,
|
|
size_t session_id_len);
|
|
|
|
/* tls1_verify_channel_id processes the current message as a Channel ID message,
|
|
* and verifies the signature. If the key is valid, it saves the Channel ID and
|
|
* returns one. Otherwise, it returns zero. */
|
|
int tls1_verify_channel_id(SSL *ssl);
|
|
|
|
/* tls1_write_channel_id generates a Channel ID message and puts the output in
|
|
* |cbb|. |ssl->tlsext_channel_id_private| must already be set before calling.
|
|
* This function returns one on success and zero on error. */
|
|
int tls1_write_channel_id(SSL *ssl, CBB *cbb);
|
|
|
|
/* tls1_channel_id_hash computes the hash to be signed by Channel ID and writes
|
|
* it to |out|, which must contain at least |EVP_MAX_MD_SIZE| bytes. It returns
|
|
* one on success and zero on failure. */
|
|
int tls1_channel_id_hash(SSL *ssl, uint8_t *out, size_t *out_len);
|
|
|
|
int tls1_record_handshake_hashes_for_channel_id(SSL *ssl);
|
|
|
|
/* ssl_do_channel_id_callback checks runs |ssl->ctx->channel_id_cb| if
|
|
* necessary. It returns one on success and zero on fatal error. Note that, on
|
|
* success, |ssl->tlsext_channel_id_private| may be unset, in which case the
|
|
* operation should be retried later. */
|
|
int ssl_do_channel_id_callback(SSL *ssl);
|
|
|
|
/* ssl3_can_false_start returns one if |ssl| is allowed to False Start and zero
|
|
* otherwise. */
|
|
int ssl3_can_false_start(const SSL *ssl);
|
|
|
|
/* ssl3_get_enc_method returns the SSL3_ENC_METHOD corresponding to
|
|
* |version|. */
|
|
const SSL3_ENC_METHOD *ssl3_get_enc_method(uint16_t version);
|
|
|
|
/* ssl_get_version_range sets |*out_min_version| and |*out_max_version| to the
|
|
* minimum and maximum enabled protocol versions, respectively. */
|
|
int ssl_get_version_range(const SSL *ssl, uint16_t *out_min_version,
|
|
uint16_t *out_max_version);
|
|
|
|
/* ssl3_protocol_version returns |ssl|'s protocol version. It is an error to
|
|
* call this function before the version is determined. */
|
|
uint16_t ssl3_protocol_version(const SSL *ssl);
|
|
|
|
uint32_t ssl_get_algorithm_prf(const SSL *ssl);
|
|
|
|
void ssl_set_client_disabled(SSL *ssl);
|
|
|
|
void ssl_get_current_time(const SSL *ssl, struct timeval *out_clock);
|
|
|
|
/* ssl_reset_error_state resets state for |SSL_get_error|. */
|
|
void ssl_reset_error_state(SSL *ssl);
|
|
|
|
|
|
#if defined(__cplusplus)
|
|
} /* extern C */
|
|
#endif
|
|
|
|
#endif /* OPENSSL_HEADER_SSL_INTERNAL_H */
|