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boringssl/ssl/ssl_asn1.cc
David Benjamin ce45588695 Speculatively remove __STDC_*_MACROS. 
C99 added macros such as PRIu64 to inttypes.h, but it said to exclude them from
C++ unless __STDC_FORMAT_MACROS or __STDC_CONSTANT_MACROS was defined. This
text was never incorporated into any C++ standard and explicitly overruled in
C++11.

Some libc headers followed C99. Notably, glibc prior to 2.18
(https://sourceware.org/bugzilla/show_bug.cgi?id=15366) and old versions of the
Android NDK.

In the NDK, although it was fixed some time ago (API level 20), the NDK used to
use separate headers per API level. Only applications using minSdkVersion >= 20
would get the fix. Starting NDK r14, "unified" headers are available which,
among other things, make the fix available (opt-in) independent of
minSdkVersion. In r15, unified headers are opt-out, and in r16 they are
mandatory.

Try removing these and see if anyone notices. The former is past our five year
watermark. The latter is not and Android has hit
https://boringssl-review.googlesource.com/c/boringssl/+/32686 before, but
unless it is really widespread, it's probably simpler to ask consumers to
define __STDC_CONSTANT_MACROS and __STDC_FORMAT_MACROS globally.

Update-Note: If you see compile failures relating to PRIu64, UINT64_MAX, and
friends, update your glibc or NDK. As a short-term fix, add
__STDC_CONSTANT_MACROS and __STDC_FORMAT_MACROS to your build, but get in touch
so we have a sense of how widespread it is.

Bug: 198
Change-Id: I56cca5f9acdff803de1748254bc45096e4c959c2
Reviewed-on: https://boringssl-review.googlesource.com/c/33146
Reviewed-by: Adam Langley <agl@google.com>
Commit-Queue: Adam Langley <agl@google.com>
CQ-Verified: CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org>
2018-11-14 16:14:37 +00:00

829 lines
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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 <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"
BSSL_NAMESPACE_BEGIN
// 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.get()) > 0 && !in->peer_sha256_valid) {
const CRYPTO_BUFFER *buffer = sk_CRYPTO_BUFFER_value(in->certs.get(), 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.get(),
strlen(in->psk_identity.get()))) {
OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE);
return 0;
}
}
if (in->ticket_lifetime_hint > 0) {
if (!CBB_add_asn1(&session, &child, kTicketLifetimeHintTag) ||
!CBB_add_asn1_uint64(&child, in->ticket_lifetime_hint)) {
OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE);
return 0;
}
}
if (!in->ticket.empty() && !for_ticket) {
if (!CBB_add_asn1(&session, &child, kTicketTag) ||
!CBB_add_asn1_octet_string(&child, in->ticket.data(),
in->ticket.size())) {
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.get()),
CRYPTO_BUFFER_len(in->signed_cert_timestamp_list.get()))) {
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.get()),
CRYPTO_BUFFER_len(in->ocsp_response.get()))) {
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.get()) >= 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.get()); i++) {
const CRYPTO_BUFFER *buffer = sk_CRYPTO_BUFFER_value(in->certs.get(), 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.empty()) {
if (!CBB_add_asn1(&session, &child, kEarlyALPNTag) ||
!CBB_add_asn1_octet_string(&child, in->early_alpn.data(),
in->early_alpn.size())) {
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|. 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, UniquePtr<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;
}
char *raw = nullptr;
if (!CBS_strdup(&value, &raw)) {
OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE);
return 0;
}
out->reset(raw);
} else {
out->reset();
}
return 1;
}
// SSL_SESSION_parse_octet_string gets an optional ASN.1 OCTET STRING explicitly
// tagged with |tag| from |cbs| and stows it in |*out|. It returns one on
// success, whether or not the element was found, and zero on decode error.
static bool SSL_SESSION_parse_octet_string(CBS *cbs, Array<uint8_t> *out,
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 false;
}
return out->CopyFrom(value);
}
static int SSL_SESSION_parse_crypto_buffer(CBS *cbs,
UniquePtr<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;
}
out->reset(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->ticket_lifetime_hint,
kTicketLifetimeHintTag, 0) ||
!SSL_SESSION_parse_octet_string(&session, &ret->ticket, 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.reset(sk_CRYPTO_BUFFER_new_null());
if (ret->certs == nullptr) {
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.get(), 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;
}
UniquePtr<CRYPTO_BUFFER> buffer(CRYPTO_BUFFER_new_from_CBS(&cert, pool));
if (buffer == nullptr ||
!PushToStack(ret->certs.get(), std::move(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 != 0;
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,
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);
}
BSSL_NAMESPACE_END
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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