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boringssl/ssl/ssl_asn1.cc
Adam Langley e8d2439cd3 Expose ssl_session_serialize to libssl. 
This function can serialise a session to a |CBB|.

Change-Id: Icdb7aef900f03f947c3fa4625dd218401eb8eafc
Reviewed-on: https://boringssl-review.googlesource.com/25385
Commit-Queue: David Benjamin <davidben@google.com>
CQ-Verified: CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org>
Reviewed-by: David Benjamin <davidben@google.com>
2018-01-26 22:31:47 +00:00

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/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
* All rights reserved.
*
* This package is an SSL implementation written
* by Eric Young (eay@cryptsoft.com).
* The implementation was written so as to conform with Netscapes SSL.
*
* This library is free for commercial and non-commercial use as long as
* the following conditions are aheared to. The following conditions
* apply to all code found in this distribution, be it the RC4, RSA,
* lhash, DES, etc., code; not just the SSL code. The SSL documentation
* included with this distribution is covered by the same copyright terms
* except that the holder is Tim Hudson (tjh@cryptsoft.com).
*
* Copyright remains Eric Young's, and as such any Copyright notices in
* the code are not to be removed.
* If this package is used in a product, Eric Young should be given attribution
* as the author of the parts of the library used.
* This can be in the form of a textual message at program startup or
* in documentation (online or textual) provided with the package.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* "This product includes cryptographic software written by
* Eric Young (eay@cryptsoft.com)"
* The word 'cryptographic' can be left out if the rouines from the library
* being used are not cryptographic related :-).
* 4. If you include any Windows specific code (or a derivative thereof) from
* the apps directory (application code) you must include an acknowledgement:
* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
*
* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* The licence and distribution terms for any publically available version or
* derivative of this code cannot be changed. i.e. this code cannot simply be
* copied and put under another distribution licence
* [including the GNU Public Licence.]
*/
/* ====================================================================
* Copyright 2005 Nokia. All rights reserved.
*
* The portions of the attached software ("Contribution") is developed by
* Nokia Corporation and is licensed pursuant to the OpenSSL open source
* license.
*
* The Contribution, originally written by Mika Kousa and Pasi Eronen of
* Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites
* support (see RFC 4279) to OpenSSL.
*
* No patent licenses or other rights except those expressly stated in
* the OpenSSL open source license shall be deemed granted or received
* expressly, by implication, estoppel, or otherwise.
*
* No assurances are provided by Nokia that the Contribution does not
* infringe the patent or other intellectual property rights of any third
* party or that the license provides you with all the necessary rights
* to make use of the Contribution.
*
* THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN
* ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA
* SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY
* OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR
* OTHERWISE. */
// Per C99, various stdint.h macros are unavailable in C++ unless some macros
// are defined. C++11 overruled this decision, but older Android NDKs still
// require it.
#if !defined(__STDC_LIMIT_MACROS)
#define __STDC_LIMIT_MACROS
#endif
#include <openssl/ssl.h>
#include <limits.h>
#include <string.h>
#include <utility>
#include <openssl/buf.h>
#include <openssl/bytestring.h>
#include <openssl/err.h>
#include <openssl/mem.h>
#include <openssl/x509.h>
#include "../crypto/internal.h"
#include "internal.h"
namespace bssl {
// An SSL_SESSION is serialized as the following ASN.1 structure:
//
// SSLSession ::= SEQUENCE {
// version INTEGER (1), -- session structure version
// sslVersion INTEGER, -- protocol version number
// cipher OCTET STRING, -- two bytes long
// sessionID OCTET STRING,
// masterKey OCTET STRING,
// time [1] INTEGER, -- seconds since UNIX epoch
// timeout [2] INTEGER, -- in seconds
// peer [3] Certificate OPTIONAL,
// sessionIDContext [4] OCTET STRING OPTIONAL,
// verifyResult [5] INTEGER OPTIONAL, -- one of X509_V_* codes
// pskIdentity [8] OCTET STRING OPTIONAL,
// ticketLifetimeHint [9] INTEGER OPTIONAL, -- client-only
// ticket [10] OCTET STRING OPTIONAL, -- client-only
// peerSHA256 [13] OCTET STRING OPTIONAL,
// originalHandshakeHash [14] OCTET STRING OPTIONAL,
// signedCertTimestampList [15] OCTET STRING OPTIONAL,
// -- contents of SCT extension
// ocspResponse [16] OCTET STRING OPTIONAL,
// -- stapled OCSP response from the server
// extendedMasterSecret [17] BOOLEAN OPTIONAL,
// groupID [18] INTEGER OPTIONAL,
// certChain [19] SEQUENCE OF Certificate OPTIONAL,
// ticketAgeAdd [21] OCTET STRING OPTIONAL,
// isServer [22] BOOLEAN DEFAULT TRUE,
// peerSignatureAlgorithm [23] INTEGER OPTIONAL,
// ticketMaxEarlyData [24] INTEGER OPTIONAL,
// authTimeout [25] INTEGER OPTIONAL, -- defaults to timeout
// earlyALPN [26] OCTET STRING OPTIONAL,
// }
//
// Note: historically this serialization has included other optional
// fields. Their presence is currently treated as a parse error, except for
// hostName, which is ignored.
//
// keyArg [0] IMPLICIT OCTET STRING OPTIONAL,
// hostName [6] OCTET STRING OPTIONAL,
// pskIdentityHint [7] OCTET STRING OPTIONAL,
// compressionMethod [11] OCTET STRING OPTIONAL,
// srpUsername [12] OCTET STRING OPTIONAL,
// ticketFlags [20] INTEGER OPTIONAL,
static const unsigned kVersion = 1;
static const unsigned kTimeTag =
CBS_ASN1_CONSTRUCTED | CBS_ASN1_CONTEXT_SPECIFIC | 1;
static const unsigned kTimeoutTag =
CBS_ASN1_CONSTRUCTED | CBS_ASN1_CONTEXT_SPECIFIC | 2;
static const unsigned kPeerTag =
CBS_ASN1_CONSTRUCTED | CBS_ASN1_CONTEXT_SPECIFIC | 3;
static const unsigned kSessionIDContextTag =
CBS_ASN1_CONSTRUCTED | CBS_ASN1_CONTEXT_SPECIFIC | 4;
static const unsigned kVerifyResultTag =
CBS_ASN1_CONSTRUCTED | CBS_ASN1_CONTEXT_SPECIFIC | 5;
static const unsigned kHostNameTag =
CBS_ASN1_CONSTRUCTED | CBS_ASN1_CONTEXT_SPECIFIC | 6;
static const unsigned kPSKIdentityTag =
CBS_ASN1_CONSTRUCTED | CBS_ASN1_CONTEXT_SPECIFIC | 8;
static const unsigned kTicketLifetimeHintTag =
CBS_ASN1_CONSTRUCTED | CBS_ASN1_CONTEXT_SPECIFIC | 9;
static const unsigned kTicketTag =
CBS_ASN1_CONSTRUCTED | CBS_ASN1_CONTEXT_SPECIFIC | 10;
static const unsigned kPeerSHA256Tag =
CBS_ASN1_CONSTRUCTED | CBS_ASN1_CONTEXT_SPECIFIC | 13;
static const unsigned kOriginalHandshakeHashTag =
CBS_ASN1_CONSTRUCTED | CBS_ASN1_CONTEXT_SPECIFIC | 14;
static const unsigned kSignedCertTimestampListTag =
CBS_ASN1_CONSTRUCTED | CBS_ASN1_CONTEXT_SPECIFIC | 15;
static const unsigned kOCSPResponseTag =
CBS_ASN1_CONSTRUCTED | CBS_ASN1_CONTEXT_SPECIFIC | 16;
static const unsigned kExtendedMasterSecretTag =
CBS_ASN1_CONSTRUCTED | CBS_ASN1_CONTEXT_SPECIFIC | 17;
static const unsigned kGroupIDTag =
CBS_ASN1_CONSTRUCTED | CBS_ASN1_CONTEXT_SPECIFIC | 18;
static const unsigned kCertChainTag =
CBS_ASN1_CONSTRUCTED | CBS_ASN1_CONTEXT_SPECIFIC | 19;
static const unsigned kTicketAgeAddTag =
CBS_ASN1_CONSTRUCTED | CBS_ASN1_CONTEXT_SPECIFIC | 21;
static const unsigned kIsServerTag =
CBS_ASN1_CONSTRUCTED | CBS_ASN1_CONTEXT_SPECIFIC | 22;
static const unsigned kPeerSignatureAlgorithmTag =
CBS_ASN1_CONSTRUCTED | CBS_ASN1_CONTEXT_SPECIFIC | 23;
static const unsigned kTicketMaxEarlyDataTag =
CBS_ASN1_CONSTRUCTED | CBS_ASN1_CONTEXT_SPECIFIC | 24;
static const unsigned kAuthTimeoutTag =
CBS_ASN1_CONSTRUCTED | CBS_ASN1_CONTEXT_SPECIFIC | 25;
static const unsigned kEarlyALPNTag =
CBS_ASN1_CONSTRUCTED | CBS_ASN1_CONTEXT_SPECIFIC | 26;
static int SSL_SESSION_to_bytes_full(const SSL_SESSION *in, CBB *cbb,
int for_ticket) {
if (in == NULL || in->cipher == NULL) {
return 0;
}
CBB session, child, child2;
if (!CBB_add_asn1(cbb, &session, CBS_ASN1_SEQUENCE) ||
!CBB_add_asn1_uint64(&session, kVersion) ||
!CBB_add_asn1_uint64(&session, in->ssl_version) ||
!CBB_add_asn1(&session, &child, CBS_ASN1_OCTETSTRING) ||
!CBB_add_u16(&child, (uint16_t)(in->cipher->id & 0xffff)) ||
// The session ID is irrelevant for a session ticket.
!CBB_add_asn1_octet_string(&session, in->session_id,
for_ticket ? 0 : in->session_id_length) ||
!CBB_add_asn1_octet_string(&session, in->master_key,
in->master_key_length) ||
!CBB_add_asn1(&session, &child, kTimeTag) ||
!CBB_add_asn1_uint64(&child, in->time) ||
!CBB_add_asn1(&session, &child, kTimeoutTag) ||
!CBB_add_asn1_uint64(&child, in->timeout)) {
OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE);
return 0;
}
// The peer certificate is only serialized if the SHA-256 isn't
// serialized instead.
if (sk_CRYPTO_BUFFER_num(in->certs) > 0 && !in->peer_sha256_valid) {
const CRYPTO_BUFFER *buffer = sk_CRYPTO_BUFFER_value(in->certs, 0);
if (!CBB_add_asn1(&session, &child, kPeerTag) ||
!CBB_add_bytes(&child, CRYPTO_BUFFER_data(buffer),
CRYPTO_BUFFER_len(buffer))) {
OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE);
return 0;
}
}
// Although it is OPTIONAL and usually empty, OpenSSL has
// historically always encoded the sid_ctx.
if (!CBB_add_asn1(&session, &child, kSessionIDContextTag) ||
!CBB_add_asn1_octet_string(&child, in->sid_ctx, in->sid_ctx_length)) {
OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE);
return 0;
}
if (in->verify_result != X509_V_OK) {
if (!CBB_add_asn1(&session, &child, kVerifyResultTag) ||
!CBB_add_asn1_uint64(&child, in->verify_result)) {
OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE);
return 0;
}
}
if (in->psk_identity) {
if (!CBB_add_asn1(&session, &child, kPSKIdentityTag) ||
!CBB_add_asn1_octet_string(&child, (const uint8_t *)in->psk_identity,
strlen(in->psk_identity))) {
OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE);
return 0;
}
}
if (in->tlsext_tick_lifetime_hint > 0) {
if (!CBB_add_asn1(&session, &child, kTicketLifetimeHintTag) ||
!CBB_add_asn1_uint64(&child, in->tlsext_tick_lifetime_hint)) {
OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE);
return 0;
}
}
if (in->tlsext_tick && !for_ticket) {
if (!CBB_add_asn1(&session, &child, kTicketTag) ||
!CBB_add_asn1_octet_string(&child, in->tlsext_tick,
in->tlsext_ticklen)) {
OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE);
return 0;
}
}
if (in->peer_sha256_valid) {
if (!CBB_add_asn1(&session, &child, kPeerSHA256Tag) ||
!CBB_add_asn1_octet_string(&child, in->peer_sha256,
sizeof(in->peer_sha256))) {
OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE);
return 0;
}
}
if (in->original_handshake_hash_len > 0) {
if (!CBB_add_asn1(&session, &child, kOriginalHandshakeHashTag) ||
!CBB_add_asn1_octet_string(&child, in->original_handshake_hash,
in->original_handshake_hash_len)) {
OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE);
return 0;
}
}
if (in->signed_cert_timestamp_list != nullptr) {
if (!CBB_add_asn1(&session, &child, kSignedCertTimestampListTag) ||
!CBB_add_asn1_octet_string(
&child, CRYPTO_BUFFER_data(in->signed_cert_timestamp_list),
CRYPTO_BUFFER_len(in->signed_cert_timestamp_list))) {
OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE);
return 0;
}
}
if (in->ocsp_response != nullptr) {
if (!CBB_add_asn1(&session, &child, kOCSPResponseTag) ||
!CBB_add_asn1_octet_string(&child,
CRYPTO_BUFFER_data(in->ocsp_response),
CRYPTO_BUFFER_len(in->ocsp_response))) {
OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE);
return 0;
}
}
if (in->extended_master_secret) {
if (!CBB_add_asn1(&session, &child, kExtendedMasterSecretTag) ||
!CBB_add_asn1_bool(&child, true)) {
OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE);
return 0;
}
}
if (in->group_id > 0 &&
(!CBB_add_asn1(&session, &child, kGroupIDTag) ||
!CBB_add_asn1_uint64(&child, in->group_id))) {
OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE);
return 0;
}
// The certificate chain is only serialized if the leaf's SHA-256 isn't
// serialized instead.
if (in->certs != NULL &&
!in->peer_sha256_valid &&
sk_CRYPTO_BUFFER_num(in->certs) >= 2) {
if (!CBB_add_asn1(&session, &child, kCertChainTag)) {
OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE);
return 0;
}
for (size_t i = 1; i < sk_CRYPTO_BUFFER_num(in->certs); i++) {
const CRYPTO_BUFFER *buffer = sk_CRYPTO_BUFFER_value(in->certs, i);
if (!CBB_add_bytes(&child, CRYPTO_BUFFER_data(buffer),
CRYPTO_BUFFER_len(buffer))) {
OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE);
return 0;
}
}
}
if (in->ticket_age_add_valid) {
if (!CBB_add_asn1(&session, &child, kTicketAgeAddTag) ||
!CBB_add_asn1(&child, &child2, CBS_ASN1_OCTETSTRING) ||
!CBB_add_u32(&child2, in->ticket_age_add)) {
OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE);
return 0;
}
}
if (!in->is_server) {
if (!CBB_add_asn1(&session, &child, kIsServerTag) ||
!CBB_add_asn1_bool(&child, false)) {
OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE);
return 0;
}
}
if (in->peer_signature_algorithm != 0 &&
(!CBB_add_asn1(&session, &child, kPeerSignatureAlgorithmTag) ||
!CBB_add_asn1_uint64(&child, in->peer_signature_algorithm))) {
OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE);
return 0;
}
if (in->ticket_max_early_data != 0 &&
(!CBB_add_asn1(&session, &child, kTicketMaxEarlyDataTag) ||
!CBB_add_asn1_uint64(&child, in->ticket_max_early_data))) {
OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE);
return 0;
}
if (in->timeout != in->auth_timeout &&
(!CBB_add_asn1(&session, &child, kAuthTimeoutTag) ||
!CBB_add_asn1_uint64(&child, in->auth_timeout))) {
OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE);
return 0;
}
if (in->early_alpn) {
if (!CBB_add_asn1(&session, &child, kEarlyALPNTag) ||
!CBB_add_asn1_octet_string(&child, (const uint8_t *)in->early_alpn,
in->early_alpn_len)) {
OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE);
return 0;
}
}
return CBB_flush(cbb);
}
// SSL_SESSION_parse_string gets an optional ASN.1 OCTET STRING
// explicitly tagged with |tag| from |cbs| and saves it in |*out|. On
// entry, if |*out| is not NULL, it frees the existing contents. If
// the element was not found, it sets |*out| to NULL. It returns one
// on success, whether or not the element was found, and zero on
// decode error.
static int SSL_SESSION_parse_string(CBS *cbs, char **out, unsigned tag) {
CBS value;
int present;
if (!CBS_get_optional_asn1_octet_string(cbs, &value, &present, tag)) {
OPENSSL_PUT_ERROR(SSL, SSL_R_INVALID_SSL_SESSION);
return 0;
}
if (present) {
if (CBS_contains_zero_byte(&value)) {
OPENSSL_PUT_ERROR(SSL, SSL_R_INVALID_SSL_SESSION);
return 0;
}
if (!CBS_strdup(&value, out)) {
OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE);
return 0;
}
} else {
OPENSSL_free(*out);
*out = NULL;
}
return 1;
}
// SSL_SESSION_parse_string gets an optional ASN.1 OCTET STRING
// explicitly tagged with |tag| from |cbs| and stows it in |*out_ptr|
// and |*out_len|. If |*out_ptr| is not NULL, it frees the existing
// contents. On entry, if the element was not found, it sets
// |*out_ptr| to NULL. It returns one on success, whether or not the
// element was found, and zero on decode error.
static int SSL_SESSION_parse_octet_string(CBS *cbs, uint8_t **out_ptr,
size_t *out_len, unsigned tag) {
CBS value;
if (!CBS_get_optional_asn1_octet_string(cbs, &value, NULL, tag)) {
OPENSSL_PUT_ERROR(SSL, SSL_R_INVALID_SSL_SESSION);
return 0;
}
if (!CBS_stow(&value, out_ptr, out_len)) {
OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE);
return 0;
}
return 1;
}
static int SSL_SESSION_parse_crypto_buffer(CBS *cbs, CRYPTO_BUFFER **out,
unsigned tag,
CRYPTO_BUFFER_POOL *pool) {
if (!CBS_peek_asn1_tag(cbs, tag)) {
return 1;
}
CBS child, value;
if (!CBS_get_asn1(cbs, &child, tag) ||
!CBS_get_asn1(&child, &value, CBS_ASN1_OCTETSTRING) ||
CBS_len(&child) != 0) {
OPENSSL_PUT_ERROR(SSL, SSL_R_INVALID_SSL_SESSION);
return 0;
}
CRYPTO_BUFFER_free(*out);
*out = CRYPTO_BUFFER_new_from_CBS(&value, pool);
if (*out == nullptr) {
OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE);
return 0;
}
return 1;
}
// SSL_SESSION_parse_bounded_octet_string parses an optional ASN.1 OCTET STRING
// explicitly tagged with |tag| of size at most |max_out|.
static int SSL_SESSION_parse_bounded_octet_string(
CBS *cbs, uint8_t *out, uint8_t *out_len, uint8_t max_out, unsigned tag) {
CBS value;
if (!CBS_get_optional_asn1_octet_string(cbs, &value, NULL, tag) ||
CBS_len(&value) > max_out) {
OPENSSL_PUT_ERROR(SSL, SSL_R_INVALID_SSL_SESSION);
return 0;
}
OPENSSL_memcpy(out, CBS_data(&value), CBS_len(&value));
*out_len = (uint8_t)CBS_len(&value);
return 1;
}
static int SSL_SESSION_parse_long(CBS *cbs, long *out, unsigned tag,
long default_value) {
uint64_t value;
if (!CBS_get_optional_asn1_uint64(cbs, &value, tag,
(uint64_t)default_value) ||
value > LONG_MAX) {
OPENSSL_PUT_ERROR(SSL, SSL_R_INVALID_SSL_SESSION);
return 0;
}
*out = (long)value;
return 1;
}
static int SSL_SESSION_parse_u32(CBS *cbs, uint32_t *out, unsigned tag,
uint32_t default_value) {
uint64_t value;
if (!CBS_get_optional_asn1_uint64(cbs, &value, tag,
(uint64_t)default_value) ||
value > 0xffffffff) {
OPENSSL_PUT_ERROR(SSL, SSL_R_INVALID_SSL_SESSION);
return 0;
}
*out = (uint32_t)value;
return 1;
}
static int SSL_SESSION_parse_u16(CBS *cbs, uint16_t *out, unsigned tag,
uint16_t default_value) {
uint64_t value;
if (!CBS_get_optional_asn1_uint64(cbs, &value, tag,
(uint64_t)default_value) ||
value > 0xffff) {
OPENSSL_PUT_ERROR(SSL, SSL_R_INVALID_SSL_SESSION);
return 0;
}
*out = (uint16_t)value;
return 1;
}
UniquePtr<SSL_SESSION> SSL_SESSION_parse(CBS *cbs,
const SSL_X509_METHOD *x509_method,
CRYPTO_BUFFER_POOL *pool) {
UniquePtr<SSL_SESSION> ret = ssl_session_new(x509_method);
if (!ret) {
return nullptr;
}
CBS session;
uint64_t version, ssl_version;
uint16_t unused;
if (!CBS_get_asn1(cbs, &session, CBS_ASN1_SEQUENCE) ||
!CBS_get_asn1_uint64(&session, &version) ||
version != kVersion ||
!CBS_get_asn1_uint64(&session, &ssl_version) ||
// Require sessions have versions valid in either TLS or DTLS. The session
// will not be used by the handshake if not applicable, but, for
// simplicity, never parse a session that does not pass
// |ssl_protocol_version_from_wire|.
ssl_version > UINT16_MAX ||
!ssl_protocol_version_from_wire(&unused, ssl_version)) {
OPENSSL_PUT_ERROR(SSL, SSL_R_INVALID_SSL_SESSION);
return nullptr;
}
ret->ssl_version = ssl_version;
CBS cipher;
uint16_t cipher_value;
if (!CBS_get_asn1(&session, &cipher, CBS_ASN1_OCTETSTRING) ||
!CBS_get_u16(&cipher, &cipher_value) ||
CBS_len(&cipher) != 0) {
OPENSSL_PUT_ERROR(SSL, SSL_R_INVALID_SSL_SESSION);
return nullptr;
}
ret->cipher = SSL_get_cipher_by_value(cipher_value);
if (ret->cipher == NULL) {
OPENSSL_PUT_ERROR(SSL, SSL_R_UNSUPPORTED_CIPHER);
return nullptr;
}
CBS session_id, master_key;
if (!CBS_get_asn1(&session, &session_id, CBS_ASN1_OCTETSTRING) ||
CBS_len(&session_id) > SSL3_MAX_SSL_SESSION_ID_LENGTH ||
!CBS_get_asn1(&session, &master_key, CBS_ASN1_OCTETSTRING) ||
CBS_len(&master_key) > SSL_MAX_MASTER_KEY_LENGTH) {
OPENSSL_PUT_ERROR(SSL, SSL_R_INVALID_SSL_SESSION);
return nullptr;
}
OPENSSL_memcpy(ret->session_id, CBS_data(&session_id), CBS_len(&session_id));
ret->session_id_length = CBS_len(&session_id);
OPENSSL_memcpy(ret->master_key, CBS_data(&master_key), CBS_len(&master_key));
ret->master_key_length = CBS_len(&master_key);
CBS child;
uint64_t timeout;
if (!CBS_get_asn1(&session, &child, kTimeTag) ||
!CBS_get_asn1_uint64(&child, &ret->time) ||
!CBS_get_asn1(&session, &child, kTimeoutTag) ||
!CBS_get_asn1_uint64(&child, &timeout) ||
timeout > UINT32_MAX) {
OPENSSL_PUT_ERROR(SSL, SSL_R_INVALID_SSL_SESSION);
return nullptr;
}
ret->timeout = (uint32_t)timeout;
CBS peer;
int has_peer;
if (!CBS_get_optional_asn1(&session, &peer, &has_peer, kPeerTag) ||
(has_peer && CBS_len(&peer) == 0)) {
OPENSSL_PUT_ERROR(SSL, SSL_R_INVALID_SSL_SESSION);
return nullptr;
}
// |peer| is processed with the certificate chain.
if (!SSL_SESSION_parse_bounded_octet_string(
&session, ret->sid_ctx, &ret->sid_ctx_length, sizeof(ret->sid_ctx),
kSessionIDContextTag) ||
!SSL_SESSION_parse_long(&session, &ret->verify_result, kVerifyResultTag,
X509_V_OK)) {
return nullptr;
}
// Skip the historical hostName field.
CBS unused_hostname;
if (!CBS_get_optional_asn1(&session, &unused_hostname, nullptr,
kHostNameTag)) {
OPENSSL_PUT_ERROR(SSL, SSL_R_INVALID_SSL_SESSION);
return nullptr;
}
if (!SSL_SESSION_parse_string(&session, &ret->psk_identity,
kPSKIdentityTag) ||
!SSL_SESSION_parse_u32(&session, &ret->tlsext_tick_lifetime_hint,
kTicketLifetimeHintTag, 0) ||
!SSL_SESSION_parse_octet_string(&session, &ret->tlsext_tick,
&ret->tlsext_ticklen, kTicketTag)) {
return nullptr;
}
if (CBS_peek_asn1_tag(&session, kPeerSHA256Tag)) {
CBS peer_sha256;
if (!CBS_get_asn1(&session, &child, kPeerSHA256Tag) ||
!CBS_get_asn1(&child, &peer_sha256, CBS_ASN1_OCTETSTRING) ||
CBS_len(&peer_sha256) != sizeof(ret->peer_sha256) ||
CBS_len(&child) != 0) {
OPENSSL_PUT_ERROR(SSL, SSL_R_INVALID_SSL_SESSION);
return nullptr;
}
OPENSSL_memcpy(ret->peer_sha256, CBS_data(&peer_sha256),
sizeof(ret->peer_sha256));
ret->peer_sha256_valid = 1;
} else {
ret->peer_sha256_valid = 0;
}
if (!SSL_SESSION_parse_bounded_octet_string(
&session, ret->original_handshake_hash,
&ret->original_handshake_hash_len,
sizeof(ret->original_handshake_hash), kOriginalHandshakeHashTag) ||
!SSL_SESSION_parse_crypto_buffer(&session,
&ret->signed_cert_timestamp_list,
kSignedCertTimestampListTag, pool) ||
!SSL_SESSION_parse_crypto_buffer(&session, &ret->ocsp_response,
kOCSPResponseTag, pool)) {
return nullptr;
}
int extended_master_secret;
if (!CBS_get_optional_asn1_bool(&session, &extended_master_secret,
kExtendedMasterSecretTag,
0 /* default to false */)) {
OPENSSL_PUT_ERROR(SSL, SSL_R_INVALID_SSL_SESSION);
return nullptr;
}
ret->extended_master_secret = !!extended_master_secret;
if (!SSL_SESSION_parse_u16(&session, &ret->group_id, kGroupIDTag, 0)) {
OPENSSL_PUT_ERROR(SSL, SSL_R_INVALID_SSL_SESSION);
return nullptr;
}
CBS cert_chain;
CBS_init(&cert_chain, NULL, 0);
int has_cert_chain;
if (!CBS_get_optional_asn1(&session, &cert_chain, &has_cert_chain,
kCertChainTag) ||
(has_cert_chain && CBS_len(&cert_chain) == 0)) {
OPENSSL_PUT_ERROR(SSL, SSL_R_INVALID_SSL_SESSION);
return nullptr;
}
if (has_cert_chain && !has_peer) {
OPENSSL_PUT_ERROR(SSL, SSL_R_INVALID_SSL_SESSION);
return nullptr;
}
if (has_peer || has_cert_chain) {
ret->certs = sk_CRYPTO_BUFFER_new_null();
if (ret->certs == NULL) {
OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE);
return nullptr;
}
if (has_peer) {
UniquePtr<CRYPTO_BUFFER> buffer(CRYPTO_BUFFER_new_from_CBS(&peer, pool));
if (!buffer ||
!PushToStack(ret->certs, std::move(buffer))) {
OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE);
return nullptr;
}
}
while (CBS_len(&cert_chain) > 0) {
CBS cert;
if (!CBS_get_any_asn1_element(&cert_chain, &cert, NULL, NULL) ||
CBS_len(&cert) == 0) {
OPENSSL_PUT_ERROR(SSL, SSL_R_INVALID_SSL_SESSION);
return nullptr;
}
CRYPTO_BUFFER *buffer = CRYPTO_BUFFER_new_from_CBS(&cert, pool);
if (buffer == NULL ||
!sk_CRYPTO_BUFFER_push(ret->certs, buffer)) {
CRYPTO_BUFFER_free(buffer);
OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE);
return nullptr;
}
}
}
if (!x509_method->session_cache_objects(ret.get())) {
OPENSSL_PUT_ERROR(SSL, SSL_R_INVALID_SSL_SESSION);
return nullptr;
}
CBS age_add;
int age_add_present;
if (!CBS_get_optional_asn1_octet_string(&session, &age_add, &age_add_present,
kTicketAgeAddTag) ||
(age_add_present &&
!CBS_get_u32(&age_add, &ret->ticket_age_add)) ||
CBS_len(&age_add) != 0) {
return nullptr;
}
ret->ticket_age_add_valid = age_add_present;
int is_server;
if (!CBS_get_optional_asn1_bool(&session, &is_server, kIsServerTag,
1 /* default to true */)) {
OPENSSL_PUT_ERROR(SSL, SSL_R_INVALID_SSL_SESSION);
return nullptr;
}
/* TODO: in time we can include |is_server| for servers too, then we can
enforce that client and server sessions are never mixed up. */
ret->is_server = is_server;
if (!SSL_SESSION_parse_u16(&session, &ret->peer_signature_algorithm,
kPeerSignatureAlgorithmTag, 0) ||
!SSL_SESSION_parse_u32(&session, &ret->ticket_max_early_data,
kTicketMaxEarlyDataTag, 0) ||
!SSL_SESSION_parse_u32(&session, &ret->auth_timeout, kAuthTimeoutTag,
ret->timeout) ||
!SSL_SESSION_parse_octet_string(&session, &ret->early_alpn,
&ret->early_alpn_len, kEarlyALPNTag) ||
CBS_len(&session) != 0) {
OPENSSL_PUT_ERROR(SSL, SSL_R_INVALID_SSL_SESSION);
return nullptr;
}
return ret;
}
int ssl_session_serialize(const SSL_SESSION *in, CBB *cbb) {
return SSL_SESSION_to_bytes_full(in, cbb, 0);
}
} // namespace bssl
using namespace bssl;
int SSL_SESSION_to_bytes(const SSL_SESSION *in, uint8_t **out_data,
size_t *out_len) {
if (in->not_resumable) {
// If the caller has an unresumable session, e.g. if |SSL_get_session| were
// called on a TLS 1.3 or False Started connection, serialize with a
// placeholder value so it is not accidentally deserialized into a resumable
// one.
static const char kNotResumableSession[] = "NOT RESUMABLE";
*out_len = strlen(kNotResumableSession);
*out_data = (uint8_t *)BUF_memdup(kNotResumableSession, *out_len);
if (*out_data == NULL) {
return 0;
}
return 1;
}
ScopedCBB cbb;
if (!CBB_init(cbb.get(), 256) ||
!SSL_SESSION_to_bytes_full(in, cbb.get(), 0) ||
!CBB_finish(cbb.get(), out_data, out_len)) {
return 0;
}
return 1;
}
int SSL_SESSION_to_bytes_for_ticket(const SSL_SESSION *in, uint8_t **out_data,
size_t *out_len) {
ScopedCBB cbb;
if (!CBB_init(cbb.get(), 256) ||
!SSL_SESSION_to_bytes_full(in, cbb.get(), 1) ||
!CBB_finish(cbb.get(), out_data, out_len)) {
return 0;
}
return 1;
}
int i2d_SSL_SESSION(SSL_SESSION *in, uint8_t **pp) {
uint8_t *out;
size_t len;
if (!SSL_SESSION_to_bytes(in, &out, &len)) {
return -1;
}
if (len > INT_MAX) {
OPENSSL_free(out);
OPENSSL_PUT_ERROR(SSL, ERR_R_OVERFLOW);
return -1;
}
if (pp) {
OPENSSL_memcpy(*pp, out, len);
*pp += len;
}
OPENSSL_free(out);
return len;
}
SSL_SESSION *SSL_SESSION_from_bytes(const uint8_t *in, size_t in_len,
const SSL_CTX *ctx) {
CBS cbs;
CBS_init(&cbs, in, in_len);
UniquePtr<SSL_SESSION> ret =
SSL_SESSION_parse(&cbs, ctx->x509_method, ctx->pool);
if (!ret) {
return NULL;
}
if (CBS_len(&cbs) != 0) {
OPENSSL_PUT_ERROR(SSL, SSL_R_INVALID_SSL_SESSION);
return NULL;
}
return ret.release();
}
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