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boringssl/ssl/tls13_client.c
Alessandro Ghedini 33fe4a0d14 Remove support for setting per-connection default session timeout 
As previously discussed, it turns out we don't actually need this, so
there's no point in keeping it.

Change-Id: If549c917b6bd818cd36948e37cb7839c8d122b1a
Reviewed-on: https://boringssl-review.googlesource.com/13641
Reviewed-by: David Benjamin <davidben@google.com>
Commit-Queue: David Benjamin <davidben@google.com>
CQ-Verified: CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org>
2017-02-07 17:46:25 +00:00

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/* Copyright (c) 2016, Google Inc.
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
#include <openssl/ssl.h>
#include <assert.h>
#include <limits.h>
#include <string.h>
#include <openssl/bytestring.h>
#include <openssl/digest.h>
#include <openssl/err.h>
#include <openssl/mem.h>
#include <openssl/stack.h>
#include <openssl/x509.h>
#include "../crypto/internal.h"
#include "internal.h"
enum client_hs_state_t {
state_process_hello_retry_request = 0,
state_send_second_client_hello,
state_process_server_hello,
state_process_encrypted_extensions,
state_process_certificate_request,
state_process_server_certificate,
state_process_server_certificate_verify,
state_process_server_finished,
state_send_client_certificate,
state_send_client_certificate_verify,
state_complete_client_certificate_verify,
state_complete_second_flight,
state_done,
};
static const uint8_t kZeroes[EVP_MAX_MD_SIZE] = {0};
static enum ssl_hs_wait_t do_process_hello_retry_request(SSL_HANDSHAKE *hs) {
SSL *const ssl = hs->ssl;
if (ssl->s3->tmp.message_type != SSL3_MT_HELLO_RETRY_REQUEST) {
hs->tls13_state = state_process_server_hello;
return ssl_hs_ok;
}
CBS cbs, extensions;
uint16_t server_wire_version;
CBS_init(&cbs, ssl->init_msg, ssl->init_num);
if (!CBS_get_u16(&cbs, &server_wire_version) ||
!CBS_get_u16_length_prefixed(&cbs, &extensions) ||
/* HelloRetryRequest may not be empty. */
CBS_len(&extensions) == 0 ||
CBS_len(&cbs) != 0) {
OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR);
ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
return ssl_hs_error;
}
int have_cookie, have_key_share;
CBS cookie, key_share;
const SSL_EXTENSION_TYPE ext_types[] = {
{TLSEXT_TYPE_key_share, &have_key_share, &key_share},
{TLSEXT_TYPE_cookie, &have_cookie, &cookie},
};
uint8_t alert;
if (!ssl_parse_extensions(&extensions, &alert, ext_types,
OPENSSL_ARRAY_SIZE(ext_types),
0 /* reject unknown */)) {
ssl3_send_alert(ssl, SSL3_AL_FATAL, alert);
return ssl_hs_error;
}
if (have_cookie) {
CBS cookie_value;
if (!CBS_get_u16_length_prefixed(&cookie, &cookie_value) ||
CBS_len(&cookie_value) == 0 ||
CBS_len(&cookie) != 0) {
OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR);
ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
return ssl_hs_error;
}
if (!CBS_stow(&cookie_value, &hs->cookie, &hs->cookie_len)) {
return ssl_hs_error;
}
}
if (have_key_share) {
uint16_t group_id;
if (!CBS_get_u16(&key_share, &group_id) || CBS_len(&key_share) != 0) {
OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR);
ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
return ssl_hs_error;
}
/* The group must be supported. */
const uint16_t *groups;
size_t groups_len;
tls1_get_grouplist(ssl, &groups, &groups_len);
int found = 0;
for (size_t i = 0; i < groups_len; i++) {
if (groups[i] == group_id) {
found = 1;
break;
}
}
if (!found) {
ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_ILLEGAL_PARAMETER);
OPENSSL_PUT_ERROR(SSL, SSL_R_WRONG_CURVE);
return ssl_hs_error;
}
/* Check that the HelloRetryRequest does not request the key share that
* was provided in the initial ClientHello. */
if (SSL_ECDH_CTX_get_id(&hs->ecdh_ctx) == group_id) {
ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_ILLEGAL_PARAMETER);
OPENSSL_PUT_ERROR(SSL, SSL_R_WRONG_CURVE);
return ssl_hs_error;
}
SSL_ECDH_CTX_cleanup(&hs->ecdh_ctx);
hs->retry_group = group_id;
}
if (!ssl_hash_current_message(ssl)) {
return ssl_hs_error;
}
hs->received_hello_retry_request = 1;
hs->tls13_state = state_send_second_client_hello;
return ssl_hs_ok;
}
static enum ssl_hs_wait_t do_send_second_client_hello(SSL_HANDSHAKE *hs) {
if (!ssl_write_client_hello(hs)) {
return ssl_hs_error;
}
hs->tls13_state = state_process_server_hello;
return ssl_hs_flush_and_read_message;
}
static enum ssl_hs_wait_t do_process_server_hello(SSL_HANDSHAKE *hs) {
SSL *const ssl = hs->ssl;
if (!ssl_check_message_type(ssl, SSL3_MT_SERVER_HELLO)) {
return ssl_hs_error;
}
CBS cbs, server_random, extensions;
uint16_t server_wire_version;
uint16_t cipher_suite;
CBS_init(&cbs, ssl->init_msg, ssl->init_num);
if (!CBS_get_u16(&cbs, &server_wire_version) ||
!CBS_get_bytes(&cbs, &server_random, SSL3_RANDOM_SIZE) ||
!CBS_get_u16(&cbs, &cipher_suite) ||
!CBS_get_u16_length_prefixed(&cbs, &extensions) ||
CBS_len(&cbs) != 0) {
ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR);
return ssl_hs_error;
}
if (server_wire_version != ssl->version) {
ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
OPENSSL_PUT_ERROR(SSL, SSL_R_WRONG_VERSION_NUMBER);
return ssl_hs_error;
}
assert(ssl->s3->have_version);
OPENSSL_memcpy(ssl->s3->server_random, CBS_data(&server_random),
SSL3_RANDOM_SIZE);
const SSL_CIPHER *cipher = SSL_get_cipher_by_value(cipher_suite);
if (cipher == NULL) {
OPENSSL_PUT_ERROR(SSL, SSL_R_UNKNOWN_CIPHER_RETURNED);
ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_ILLEGAL_PARAMETER);
return ssl_hs_error;
}
/* Check if the cipher is a TLS 1.3 cipher. */
if (SSL_CIPHER_get_min_version(cipher) > ssl3_protocol_version(ssl) ||
SSL_CIPHER_get_max_version(cipher) < ssl3_protocol_version(ssl)) {
OPENSSL_PUT_ERROR(SSL, SSL_R_WRONG_CIPHER_RETURNED);
ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_ILLEGAL_PARAMETER);
return ssl_hs_error;
}
/* Parse out the extensions. */
int have_key_share = 0, have_pre_shared_key = 0, have_short_header = 0;
CBS key_share, pre_shared_key, short_header;
const SSL_EXTENSION_TYPE ext_types[] = {
{TLSEXT_TYPE_key_share, &have_key_share, &key_share},
{TLSEXT_TYPE_pre_shared_key, &have_pre_shared_key, &pre_shared_key},
{TLSEXT_TYPE_short_header, &have_short_header, &short_header},
};
uint8_t alert;
if (!ssl_parse_extensions(&extensions, &alert, ext_types,
OPENSSL_ARRAY_SIZE(ext_types),
0 /* reject unknown */)) {
ssl3_send_alert(ssl, SSL3_AL_FATAL, alert);
return ssl_hs_error;
}
alert = SSL_AD_DECODE_ERROR;
if (have_pre_shared_key) {
if (ssl->session == NULL) {
OPENSSL_PUT_ERROR(SSL, SSL_R_UNEXPECTED_EXTENSION);
ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_UNSUPPORTED_EXTENSION);
return ssl_hs_error;
}
if (!ssl_ext_pre_shared_key_parse_serverhello(hs, &alert,
&pre_shared_key)) {
ssl3_send_alert(ssl, SSL3_AL_FATAL, alert);
return ssl_hs_error;
}
if (ssl->session->ssl_version != ssl->version) {
OPENSSL_PUT_ERROR(SSL, SSL_R_OLD_SESSION_VERSION_NOT_RETURNED);
ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_ILLEGAL_PARAMETER);
return ssl_hs_error;
}
if (ssl->session->cipher->algorithm_prf != cipher->algorithm_prf) {
OPENSSL_PUT_ERROR(SSL, SSL_R_OLD_SESSION_PRF_HASH_MISMATCH);
ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_ILLEGAL_PARAMETER);
return ssl_hs_error;
}
if (!ssl_session_is_context_valid(ssl, ssl->session)) {
/* This is actually a client application bug. */
OPENSSL_PUT_ERROR(SSL,
SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_ILLEGAL_PARAMETER);
return ssl_hs_error;
}
ssl->s3->session_reused = 1;
/* Only authentication information carries over in TLS 1.3. */
ssl->s3->new_session =
SSL_SESSION_dup(ssl->session, SSL_SESSION_DUP_AUTH_ONLY);
if (ssl->s3->new_session == NULL) {
ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
return ssl_hs_error;
}
ssl_set_session(ssl, NULL);
/* Resumption incorporates fresh key material, so refresh the timeout. */
ssl_session_renew_timeout(ssl, ssl->s3->new_session,
ssl->initial_ctx->session_psk_dhe_timeout);
} else if (!ssl_get_new_session(hs, 0)) {
ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
return ssl_hs_error;
}
ssl->s3->new_session->cipher = cipher;
ssl->s3->tmp.new_cipher = cipher;
/* The PRF hash is now known. Set up the key schedule. */
size_t hash_len =
EVP_MD_size(ssl_get_handshake_digest(ssl_get_algorithm_prf(ssl)));
if (!tls13_init_key_schedule(hs)) {
return ssl_hs_error;
}
/* Incorporate the PSK into the running secret. */
if (ssl->s3->session_reused) {
if (!tls13_advance_key_schedule(hs, ssl->s3->new_session->master_key,
ssl->s3->new_session->master_key_length)) {
return ssl_hs_error;
}
} else if (!tls13_advance_key_schedule(hs, kZeroes, hash_len)) {
return ssl_hs_error;
}
if (!have_key_share) {
/* We do not support psk_ke and thus always require a key share. */
OPENSSL_PUT_ERROR(SSL, SSL_R_MISSING_KEY_SHARE);
ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_MISSING_EXTENSION);
return ssl_hs_error;
}
/* Resolve ECDHE and incorporate it into the secret. */
uint8_t *dhe_secret;
size_t dhe_secret_len;
if (!ssl_ext_key_share_parse_serverhello(hs, &dhe_secret, &dhe_secret_len,
&alert, &key_share)) {
ssl3_send_alert(ssl, SSL3_AL_FATAL, alert);
return ssl_hs_error;
}
if (!tls13_advance_key_schedule(hs, dhe_secret, dhe_secret_len)) {
OPENSSL_free(dhe_secret);
return ssl_hs_error;
}
OPENSSL_free(dhe_secret);
/* Negotiate short record headers. */
if (have_short_header) {
if (CBS_len(&short_header) != 0) {
OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR);
ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
return ssl_hs_error;
}
if (!ssl->ctx->short_header_enabled) {
OPENSSL_PUT_ERROR(SSL, SSL_R_UNEXPECTED_EXTENSION);
ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_UNSUPPORTED_EXTENSION);
return ssl_hs_error;
}
ssl->s3->short_header = 1;
}
if (!ssl_hash_current_message(ssl) ||
!tls13_derive_handshake_secrets(hs) ||
!tls13_set_traffic_key(ssl, evp_aead_open, hs->server_handshake_secret,
hs->hash_len) ||
!tls13_set_traffic_key(ssl, evp_aead_seal, hs->client_handshake_secret,
hs->hash_len)) {
return ssl_hs_error;
}
hs->tls13_state = state_process_encrypted_extensions;
return ssl_hs_read_message;
}
static enum ssl_hs_wait_t do_process_encrypted_extensions(SSL_HANDSHAKE *hs) {
SSL *const ssl = hs->ssl;
if (!ssl_check_message_type(ssl, SSL3_MT_ENCRYPTED_EXTENSIONS)) {
return ssl_hs_error;
}
CBS cbs;
CBS_init(&cbs, ssl->init_msg, ssl->init_num);
if (!ssl_parse_serverhello_tlsext(hs, &cbs)) {
OPENSSL_PUT_ERROR(SSL, SSL_R_PARSE_TLSEXT);
return ssl_hs_error;
}
if (CBS_len(&cbs) != 0) {
OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR);
ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
return ssl_hs_error;
}
if (!ssl_hash_current_message(ssl)) {
return ssl_hs_error;
}
hs->tls13_state = state_process_certificate_request;
return ssl_hs_read_message;
}
static enum ssl_hs_wait_t do_process_certificate_request(SSL_HANDSHAKE *hs) {
SSL *const ssl = hs->ssl;
/* CertificateRequest may only be sent in non-resumption handshakes. */
if (ssl->s3->session_reused) {
hs->tls13_state = state_process_server_finished;
return ssl_hs_ok;
}
/* CertificateRequest is optional. */
if (ssl->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST) {
hs->tls13_state = state_process_server_certificate;
return ssl_hs_ok;
}
CBS cbs, context, supported_signature_algorithms;
CBS_init(&cbs, ssl->init_msg, ssl->init_num);
if (!CBS_get_u8_length_prefixed(&cbs, &context) ||
/* The request context is always empty during the handshake. */
CBS_len(&context) != 0 ||
!CBS_get_u16_length_prefixed(&cbs, &supported_signature_algorithms) ||
CBS_len(&supported_signature_algorithms) == 0 ||
!tls1_parse_peer_sigalgs(hs, &supported_signature_algorithms)) {
ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR);
return ssl_hs_error;
}
uint8_t alert;
STACK_OF(X509_NAME) *ca_sk = ssl_parse_client_CA_list(ssl, &alert, &cbs);
if (ca_sk == NULL) {
ssl3_send_alert(ssl, SSL3_AL_FATAL, alert);
return ssl_hs_error;
}
/* Ignore extensions. */
CBS extensions;
if (!CBS_get_u16_length_prefixed(&cbs, &extensions) ||
CBS_len(&cbs) != 0) {
ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
sk_X509_NAME_pop_free(ca_sk, X509_NAME_free);
OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR);
return ssl_hs_error;
}
hs->cert_request = 1;
sk_X509_NAME_pop_free(hs->ca_names, X509_NAME_free);
hs->ca_names = ca_sk;
if (!ssl_hash_current_message(ssl)) {
return ssl_hs_error;
}
hs->tls13_state = state_process_server_certificate;
return ssl_hs_read_message;
}
static enum ssl_hs_wait_t do_process_server_certificate(SSL_HANDSHAKE *hs) {
SSL *const ssl = hs->ssl;
if (!ssl_check_message_type(ssl, SSL3_MT_CERTIFICATE) ||
!tls13_process_certificate(hs, 0 /* certificate required */) ||
!ssl_hash_current_message(ssl)) {
return ssl_hs_error;
}
hs->tls13_state = state_process_server_certificate_verify;
return ssl_hs_read_message;
}
static enum ssl_hs_wait_t do_process_server_certificate_verify(
SSL_HANDSHAKE *hs) {
SSL *const ssl = hs->ssl;
if (!ssl_check_message_type(ssl, SSL3_MT_CERTIFICATE_VERIFY) ||
!tls13_process_certificate_verify(hs) ||
!ssl_hash_current_message(ssl)) {
return ssl_hs_error;
}
hs->tls13_state = state_process_server_finished;
return ssl_hs_read_message;
}
static enum ssl_hs_wait_t do_process_server_finished(SSL_HANDSHAKE *hs) {
SSL *const ssl = hs->ssl;
if (!ssl_check_message_type(ssl, SSL3_MT_FINISHED) ||
!tls13_process_finished(hs) ||
!ssl_hash_current_message(ssl) ||
/* Update the secret to the master secret and derive traffic keys. */
!tls13_advance_key_schedule(hs, kZeroes, hs->hash_len) ||
!tls13_derive_application_secrets(hs)) {
return ssl_hs_error;
}
ssl->method->received_flight(ssl);
hs->tls13_state = state_send_client_certificate;
return ssl_hs_ok;
}
static enum ssl_hs_wait_t do_send_client_certificate(SSL_HANDSHAKE *hs) {
SSL *const ssl = hs->ssl;
/* The peer didn't request a certificate. */
if (!hs->cert_request) {
hs->tls13_state = state_complete_second_flight;
return ssl_hs_ok;
}
/* Call cert_cb to update the certificate. */
if (ssl->cert->cert_cb != NULL) {
int rv = ssl->cert->cert_cb(ssl, ssl->cert->cert_cb_arg);
if (rv == 0) {
ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
OPENSSL_PUT_ERROR(SSL, SSL_R_CERT_CB_ERROR);
return ssl_hs_error;
}
if (rv < 0) {
hs->tls13_state = state_send_client_certificate;
return ssl_hs_x509_lookup;
}
}
if (!ssl_auto_chain_if_needed(ssl) ||
!tls13_add_certificate(hs)) {
return ssl_hs_error;
}
hs->tls13_state = state_send_client_certificate_verify;
return ssl_hs_ok;
}
static enum ssl_hs_wait_t do_send_client_certificate_verify(SSL_HANDSHAKE *hs,
int is_first_run) {
SSL *const ssl = hs->ssl;
/* Don't send CertificateVerify if there is no certificate. */
if (!ssl_has_certificate(ssl)) {
hs->tls13_state = state_complete_second_flight;
return ssl_hs_ok;
}
switch (tls13_add_certificate_verify(hs, is_first_run)) {
case ssl_private_key_success:
hs->tls13_state = state_complete_second_flight;
return ssl_hs_ok;
case ssl_private_key_retry:
hs->tls13_state = state_complete_client_certificate_verify;
return ssl_hs_private_key_operation;
case ssl_private_key_failure:
return ssl_hs_error;
}
assert(0);
return ssl_hs_error;
}
static enum ssl_hs_wait_t do_complete_second_flight(SSL_HANDSHAKE *hs) {
SSL *const ssl = hs->ssl;
/* Send a Channel ID assertion if necessary. */
if (ssl->s3->tlsext_channel_id_valid) {
if (!ssl_do_channel_id_callback(ssl)) {
hs->tls13_state = state_complete_second_flight;
return ssl_hs_error;
}
if (ssl->tlsext_channel_id_private == NULL) {
return ssl_hs_channel_id_lookup;
}
CBB cbb, body;
if (!ssl->method->init_message(ssl, &cbb, &body, SSL3_MT_CHANNEL_ID) ||
!tls1_write_channel_id(ssl, &body) ||
!ssl_add_message_cbb(ssl, &cbb)) {
CBB_cleanup(&cbb);
return ssl_hs_error;
}
}
/* Send a Finished message. */
if (!tls13_add_finished(hs)) {
return ssl_hs_error;
}
/* Derive the final keys and enable them. */
if (!tls13_set_traffic_key(ssl, evp_aead_open, hs->server_traffic_secret_0,
hs->hash_len) ||
!tls13_set_traffic_key(ssl, evp_aead_seal, hs->client_traffic_secret_0,
hs->hash_len) ||
!tls13_derive_resumption_secret(hs)) {
return ssl_hs_error;
}
hs->tls13_state = state_done;
return ssl_hs_flush;
}
enum ssl_hs_wait_t tls13_client_handshake(SSL_HANDSHAKE *hs) {
while (hs->tls13_state != state_done) {
enum ssl_hs_wait_t ret = ssl_hs_error;
enum client_hs_state_t state = hs->tls13_state;
switch (state) {
case state_process_hello_retry_request:
ret = do_process_hello_retry_request(hs);
break;
case state_send_second_client_hello:
ret = do_send_second_client_hello(hs);
break;
case state_process_server_hello:
ret = do_process_server_hello(hs);
break;
case state_process_encrypted_extensions:
ret = do_process_encrypted_extensions(hs);
break;
case state_process_certificate_request:
ret = do_process_certificate_request(hs);
break;
case state_process_server_certificate:
ret = do_process_server_certificate(hs);
break;
case state_process_server_certificate_verify:
ret = do_process_server_certificate_verify(hs);
break;
case state_process_server_finished:
ret = do_process_server_finished(hs);
break;
case state_send_client_certificate:
ret = do_send_client_certificate(hs);
break;
case state_send_client_certificate_verify:
ret = do_send_client_certificate_verify(hs, 1 /* first run */);
break;
case state_complete_client_certificate_verify:
ret = do_send_client_certificate_verify(hs, 0 /* complete */);
break;
case state_complete_second_flight:
ret = do_complete_second_flight(hs);
break;
case state_done:
ret = ssl_hs_ok;
break;
}
if (ret != ssl_hs_ok) {
return ret;
}
}
return ssl_hs_ok;
}
int tls13_process_new_session_ticket(SSL *ssl) {
int ret = 0;
SSL_SESSION *session =
SSL_SESSION_dup(ssl->s3->established_session,
SSL_SESSION_INCLUDE_NONAUTH);
if (session == NULL) {
return 0;
}
ssl_session_rebase_time(ssl, session);
uint32_t server_timeout;
CBS cbs, ticket, extensions;
CBS_init(&cbs, ssl->init_msg, ssl->init_num);
if (!CBS_get_u32(&cbs, &server_timeout) ||
!CBS_get_u32(&cbs, &session->ticket_age_add) ||
!CBS_get_u16_length_prefixed(&cbs, &ticket) ||
!CBS_stow(&ticket, &session->tlsext_tick, &session->tlsext_ticklen) ||
!CBS_get_u16_length_prefixed(&cbs, &extensions) ||
CBS_len(&cbs) != 0) {
ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR);
goto err;
}
/* Cap the renewable lifetime by the server advertised value. This avoids
* wasting bandwidth on 0-RTT when we know the server will reject it.
*
* TODO(davidben): This dance where we're not sure if long or uint32_t is
* bigger is silly. session->timeout should not be a long to begin with.
* https://crbug.com/boringssl/155. */
#if LONG_MAX < 0xffffffff
if (server_timeout > LONG_MAX) {
server_timeout = LONG_MAX;
}
#endif
if (session->timeout > (long)server_timeout) {
session->timeout = (long)server_timeout;
}
/* Parse out the extensions. */
int have_early_data_info = 0;
CBS early_data_info;
const SSL_EXTENSION_TYPE ext_types[] = {
{TLSEXT_TYPE_ticket_early_data_info, &have_early_data_info,
&early_data_info},
};
uint8_t alert;
if (!ssl_parse_extensions(&extensions, &alert, ext_types,
OPENSSL_ARRAY_SIZE(ext_types),
1 /* ignore unknown */)) {
ssl3_send_alert(ssl, SSL3_AL_FATAL, alert);
goto err;
}
if (have_early_data_info && ssl->ctx->enable_early_data) {
if (!CBS_get_u32(&early_data_info, &session->ticket_max_early_data) ||
CBS_len(&early_data_info) != 0) {
ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR);
goto err;
}
}
session->ticket_age_add_valid = 1;
session->not_resumable = 0;
if (ssl->ctx->new_session_cb != NULL &&
ssl->ctx->new_session_cb(ssl, session)) {
/* |new_session_cb|'s return value signals that it took ownership. */
session = NULL;
}
ret = 1;
err:
SSL_SESSION_free(session);
return ret;
}
void ssl_clear_tls13_state(SSL_HANDSHAKE *hs) {
SSL_ECDH_CTX_cleanup(&hs->ecdh_ctx);
OPENSSL_free(hs->key_share_bytes);
hs->key_share_bytes = NULL;
hs->key_share_bytes_len = 0;
}
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