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boringssl/ssl/ssl_asn1.c
David Benjamin 17b3083373 Use a separate timeout scheme for TLS 1.3. 
In TLS 1.2, resumption's benefits are more-or-less subsumed by False
Start. TLS 1.2 resumption lifetime is bounded by how much traffic we are
willing to encrypt without fresh key material, so the lifetime is short.
Renewal uses the same key, so we do not allow it to increase lifetimes.

In TLS 1.3, resumption unlocks 0-RTT. We do not implement psk_ke, so
resumption incorporates fresh key material into both encrypted traffic
(except for early data) and renewed tickets. Thus we are both more
willing to and more interested in longer lifetimes for tickets. Renewal
is also not useless. Thus in TLS 1.3, lifetime is bound separately by
the lifetime of a given secret as a psk_dhe_ke authenticator and the
lifetime of the online signature which authenticated the initial
handshake.

This change maintains two lifetimes on an SSL_SESSION: timeout which is
the renewable lifetime of this ticket, and auth_timeout which is the
non-renewable cliff. It also separates the TLS 1.2 and TLS 1.3 timeouts.
The old session timeout defaults and configuration apply to TLS 1.3, and
we define new ones for TLS 1.3.

Finally, this makes us honor the NewSessionTicket timeout in TLS 1.3.
It's no longer a "hint" in 1.3 and there's probably value in avoiding
known-useless 0-RTT offers.

BUG=120

Change-Id: Iac46d56e5a6a377d8b88b8fa31f492d534cb1b85
Reviewed-on: https://boringssl-review.googlesource.com/13503
Reviewed-by: Adam Langley <agl@google.com>
2017-02-02 19:51:49 +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. */
#include <openssl/ssl.h>
#include <limits.h>
#include <string.h>
#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"
/* 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
* hostName [6] OCTET STRING OPTIONAL,
* -- from server_name extension
* 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,
* -- For historical reasons, for legacy DHE or
* -- static RSA ciphers, this field contains
* -- another value to be discarded.
* 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
* }
*
* Note: historically this serialization has included other optional
* fields. Their presence is currently treated as a parse error:
*
* keyArg [0] IMPLICIT 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 int kTimeTag =
CBS_ASN1_CONSTRUCTED | CBS_ASN1_CONTEXT_SPECIFIC | 1;
static const int kTimeoutTag =
CBS_ASN1_CONSTRUCTED | CBS_ASN1_CONTEXT_SPECIFIC | 2;
static const int kPeerTag =
CBS_ASN1_CONSTRUCTED | CBS_ASN1_CONTEXT_SPECIFIC | 3;
static const int kSessionIDContextTag =
CBS_ASN1_CONSTRUCTED | CBS_ASN1_CONTEXT_SPECIFIC | 4;
static const int kVerifyResultTag =
CBS_ASN1_CONSTRUCTED | CBS_ASN1_CONTEXT_SPECIFIC | 5;
static const int kHostNameTag =
CBS_ASN1_CONSTRUCTED | CBS_ASN1_CONTEXT_SPECIFIC | 6;
static const int kPSKIdentityTag =
CBS_ASN1_CONSTRUCTED | CBS_ASN1_CONTEXT_SPECIFIC | 8;
static const int kTicketLifetimeHintTag =
CBS_ASN1_CONSTRUCTED | CBS_ASN1_CONTEXT_SPECIFIC | 9;
static const int kTicketTag =
CBS_ASN1_CONSTRUCTED | CBS_ASN1_CONTEXT_SPECIFIC | 10;
static const int kPeerSHA256Tag =
CBS_ASN1_CONSTRUCTED | CBS_ASN1_CONTEXT_SPECIFIC | 13;
static const int kOriginalHandshakeHashTag =
CBS_ASN1_CONSTRUCTED | CBS_ASN1_CONTEXT_SPECIFIC | 14;
static const int kSignedCertTimestampListTag =
CBS_ASN1_CONSTRUCTED | CBS_ASN1_CONTEXT_SPECIFIC | 15;
static const int kOCSPResponseTag =
CBS_ASN1_CONSTRUCTED | CBS_ASN1_CONTEXT_SPECIFIC | 16;
static const int kExtendedMasterSecretTag =
CBS_ASN1_CONSTRUCTED | CBS_ASN1_CONTEXT_SPECIFIC | 17;
static const int kGroupIDTag =
CBS_ASN1_CONSTRUCTED | CBS_ASN1_CONTEXT_SPECIFIC | 18;
static const int kCertChainTag =
CBS_ASN1_CONSTRUCTED | CBS_ASN1_CONTEXT_SPECIFIC | 19;
static const int kTicketAgeAddTag =
CBS_ASN1_CONSTRUCTED | CBS_ASN1_CONTEXT_SPECIFIC | 21;
static const int kIsServerTag =
CBS_ASN1_CONSTRUCTED | CBS_ASN1_CONTEXT_SPECIFIC | 22;
static const int kPeerSignatureAlgorithmTag =
CBS_ASN1_CONSTRUCTED | CBS_ASN1_CONTEXT_SPECIFIC | 23;
static const int kTicketMaxEarlyDataTag =
CBS_ASN1_CONSTRUCTED | CBS_ASN1_CONTEXT_SPECIFIC | 24;
static const int kAuthTimeoutTag =
CBS_ASN1_CONSTRUCTED | CBS_ASN1_CONTEXT_SPECIFIC | 25;
static int SSL_SESSION_to_bytes_full(const SSL_SESSION *in, uint8_t **out_data,
size_t *out_len, int for_ticket) {
CBB cbb, session, child, child2;
if (in == NULL || in->cipher == NULL) {
return 0;
}
CBB_zero(&cbb);
if (!CBB_init(&cbb, 0) ||
!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)) ||
!CBB_add_asn1(&session, &child, CBS_ASN1_OCTETSTRING) ||
/* The session ID is irrelevant for a session ticket. */
!CBB_add_bytes(&child, in->session_id,
for_ticket ? 0 : in->session_id_length) ||
!CBB_add_asn1(&session, &child, CBS_ASN1_OCTETSTRING) ||
!CBB_add_bytes(&child, in->master_key, in->master_key_length)) {
OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE);
goto err;
}
if (in->time < 0) {
OPENSSL_PUT_ERROR(SSL, SSL_R_INVALID_SSL_SESSION);
goto err;
}
if (!CBB_add_asn1(&session, &child, kTimeTag) ||
!CBB_add_asn1_uint64(&child, in->time)) {
OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE);
goto err;
}
if (in->timeout < 0) {
OPENSSL_PUT_ERROR(SSL, SSL_R_INVALID_SSL_SESSION);
goto err;
}
if (!CBB_add_asn1(&session, &child, kTimeoutTag) ||
!CBB_add_asn1_uint64(&child, in->timeout)) {
OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE);
goto err;
}
/* 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);
goto err;
}
}
/* 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(&child, &child2, CBS_ASN1_OCTETSTRING) ||
!CBB_add_bytes(&child2, in->sid_ctx, in->sid_ctx_length)) {
OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE);
goto err;
}
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);
goto err;
}
}
if (in->tlsext_hostname) {
if (!CBB_add_asn1(&session, &child, kHostNameTag) ||
!CBB_add_asn1(&child, &child2, CBS_ASN1_OCTETSTRING) ||
!CBB_add_bytes(&child2, (const uint8_t *)in->tlsext_hostname,
strlen(in->tlsext_hostname))) {
OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE);
goto err;
}
}
if (in->psk_identity) {
if (!CBB_add_asn1(&session, &child, kPSKIdentityTag) ||
!CBB_add_asn1(&child, &child2, CBS_ASN1_OCTETSTRING) ||
!CBB_add_bytes(&child2, (const uint8_t *)in->psk_identity,
strlen(in->psk_identity))) {
OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE);
goto err;
}
}
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);
goto err;
}
}
if (in->tlsext_tick && !for_ticket) {
if (!CBB_add_asn1(&session, &child, kTicketTag) ||
!CBB_add_asn1(&child, &child2, CBS_ASN1_OCTETSTRING) ||
!CBB_add_bytes(&child2, in->tlsext_tick, in->tlsext_ticklen)) {
OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE);
goto err;
}
}
if (in->peer_sha256_valid) {
if (!CBB_add_asn1(&session, &child, kPeerSHA256Tag) ||
!CBB_add_asn1(&child, &child2, CBS_ASN1_OCTETSTRING) ||
!CBB_add_bytes(&child2, in->peer_sha256, sizeof(in->peer_sha256))) {
OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE);
goto err;
}
}
if (in->original_handshake_hash_len > 0) {
if (!CBB_add_asn1(&session, &child, kOriginalHandshakeHashTag) ||
!CBB_add_asn1(&child, &child2, CBS_ASN1_OCTETSTRING) ||
!CBB_add_bytes(&child2, in->original_handshake_hash,
in->original_handshake_hash_len)) {
OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE);
goto err;
}
}
if (in->tlsext_signed_cert_timestamp_list_length > 0) {
if (!CBB_add_asn1(&session, &child, kSignedCertTimestampListTag) ||
!CBB_add_asn1(&child, &child2, CBS_ASN1_OCTETSTRING) ||
!CBB_add_bytes(&child2, in->tlsext_signed_cert_timestamp_list,
in->tlsext_signed_cert_timestamp_list_length)) {
OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE);
goto err;
}
}
if (in->ocsp_response_length > 0) {
if (!CBB_add_asn1(&session, &child, kOCSPResponseTag) ||
!CBB_add_asn1(&child, &child2, CBS_ASN1_OCTETSTRING) ||
!CBB_add_bytes(&child2, in->ocsp_response, in->ocsp_response_length)) {
OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE);
goto err;
}
}
if (in->extended_master_secret) {
if (!CBB_add_asn1(&session, &child, kExtendedMasterSecretTag) ||
!CBB_add_asn1(&child, &child2, CBS_ASN1_BOOLEAN) ||
!CBB_add_u8(&child2, 0xff)) {
OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE);
goto err;
}
}
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);
goto err;
}
/* 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);
goto err;
}
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);
goto err;
}
}
}
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);
goto err;
}
}
if (!in->is_server) {
if (!CBB_add_asn1(&session, &child, kIsServerTag) ||
!CBB_add_asn1(&child, &child2, CBS_ASN1_BOOLEAN) ||
!CBB_add_u8(&child2, 0x00)) {
OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE);
goto err;
}
}
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);
goto err;
}
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);
goto err;
}
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);
goto err;
}
if (!CBB_finish(&cbb, out_data, out_len)) {
OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE);
goto err;
}
return 1;
err:
CBB_cleanup(&cbb);
return 0;
}
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 = BUF_memdup(kNotResumableSession, *out_len);
if (*out_data == NULL) {
return 0;
}
return 1;
}
return SSL_SESSION_to_bytes_full(in, out_data, out_len, 0);
}
int SSL_SESSION_to_bytes_for_ticket(const SSL_SESSION *in, uint8_t **out_data,
size_t *out_len) {
return SSL_SESSION_to_bytes_full(in, out_data, out_len, 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_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;
}
/* 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;
}
static SSL_SESSION *SSL_SESSION_parse(CBS *cbs) {
SSL_SESSION *ret = SSL_SESSION_new();
if (ret == NULL) {
goto err;
}
CBS session;
uint64_t version, ssl_version;
if (!CBS_get_asn1(cbs, &session, CBS_ASN1_SEQUENCE) ||
!CBS_get_asn1_uint64(&session, &version) ||
version != kVersion ||
!CBS_get_asn1_uint64(&session, &ssl_version)) {
OPENSSL_PUT_ERROR(SSL, SSL_R_INVALID_SSL_SESSION);
goto err;
}
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);
goto err;
}
ret->cipher = SSL_get_cipher_by_value(cipher_value);
if (ret->cipher == NULL) {
OPENSSL_PUT_ERROR(SSL, SSL_R_UNSUPPORTED_CIPHER);
goto err;
}
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);
goto err;
}
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 time, timeout;
if (!CBS_get_asn1(&session, &child, kTimeTag) ||
!CBS_get_asn1_uint64(&child, &time) ||
time > LONG_MAX ||
!CBS_get_asn1(&session, &child, kTimeoutTag) ||
!CBS_get_asn1_uint64(&child, &timeout) ||
timeout > LONG_MAX) {
OPENSSL_PUT_ERROR(SSL, SSL_R_INVALID_SSL_SESSION);
goto err;
}
ret->time = (long)time;
ret->timeout = (long)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);
goto err;
}
/* |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) ||
!SSL_SESSION_parse_string(&session, &ret->tlsext_hostname,
kHostNameTag) ||
!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)) {
goto err;
}
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);
goto err;
}
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_octet_string(
&session, &ret->tlsext_signed_cert_timestamp_list,
&ret->tlsext_signed_cert_timestamp_list_length,
kSignedCertTimestampListTag) ||
!SSL_SESSION_parse_octet_string(
&session, &ret->ocsp_response, &ret->ocsp_response_length,
kOCSPResponseTag)) {
goto err;
}
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);
goto err;
}
ret->extended_master_secret = !!extended_master_secret;
uint32_t value;
if (!SSL_SESSION_parse_u32(&session, &value, kGroupIDTag, 0)) {
OPENSSL_PUT_ERROR(SSL, SSL_R_INVALID_SSL_SESSION);
goto err;
}
/* Historically, the group_id field was used for key-exchange-specific
* information. Discard all but the group ID. */
if (ret->cipher->algorithm_mkey & (SSL_kRSA | SSL_kDHE)) {
value = 0;
}
if (value > 0xffff) {
OPENSSL_PUT_ERROR(SSL, SSL_R_INVALID_SSL_SESSION);
goto err;
}
ret->group_id = (uint16_t)value;
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);
goto err;
}
if (has_cert_chain && !has_peer) {
OPENSSL_PUT_ERROR(SSL, SSL_R_INVALID_SSL_SESSION);
goto err;
}
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);
goto err;
}
if (has_peer) {
/* TODO(agl): this should use the |SSL_CTX|'s pool. */
CRYPTO_BUFFER *buffer = CRYPTO_BUFFER_new_from_CBS(&peer, NULL);
if (buffer == NULL ||
!sk_CRYPTO_BUFFER_push(ret->certs, buffer)) {
CRYPTO_BUFFER_free(buffer);
OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE);
goto err;
}
}
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);
goto err;
}
/* TODO(agl): this should use the |SSL_CTX|'s pool. */
CRYPTO_BUFFER *buffer = CRYPTO_BUFFER_new_from_CBS(&cert, NULL);
if (buffer == NULL ||
!sk_CRYPTO_BUFFER_push(ret->certs, buffer)) {
CRYPTO_BUFFER_free(buffer);
OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE);
goto err;
}
}
}
if (!ssl_session_x509_cache_objects(ret)) {
OPENSSL_PUT_ERROR(SSL, SSL_R_INVALID_SSL_SESSION);
goto err;
}
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) {
goto err;
}
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);
goto err;
}
/* 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_long(&session, &ret->auth_timeout, kAuthTimeoutTag,
ret->timeout) ||
CBS_len(&session) != 0) {
OPENSSL_PUT_ERROR(SSL, SSL_R_INVALID_SSL_SESSION);
goto err;
}
return ret;
err:
SSL_SESSION_free(ret);
return NULL;
}
SSL_SESSION *SSL_SESSION_from_bytes(const uint8_t *in, size_t in_len) {
CBS cbs;
CBS_init(&cbs, in, in_len);
SSL_SESSION *ret = SSL_SESSION_parse(&cbs);
if (ret == NULL) {
return NULL;
}
if (CBS_len(&cbs) != 0) {
OPENSSL_PUT_ERROR(SSL, SSL_R_INVALID_SSL_SESSION);
SSL_SESSION_free(ret);
return NULL;
}
return ret;
}
SSL_SESSION *d2i_SSL_SESSION(SSL_SESSION **a, const uint8_t **pp, long length) {
if (length < 0) {
OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR);
return NULL;
}
CBS cbs;
CBS_init(&cbs, *pp, length);
SSL_SESSION *ret = SSL_SESSION_parse(&cbs);
if (ret == NULL) {
return NULL;
}
if (a) {
SSL_SESSION_free(*a);
*a = ret;
}
*pp = CBS_data(&cbs);
return ret;
}
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