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boringssl/ssl/ssl_session.c
Steven Valdez 2f82a0e51b Don't stash tlsext_hostname in ssl_get_new_session. 
ssl_get_new_session would stash a copy of the configured hostname
into the SSL_SESSION on the server. Servers have no reason to
configuring that anyway, but, if one did, we'd leak when filling in
the client-supplied SNI later.

Remove this code and guard against this by remembering to OPENSSL_free
when overwriting that field (although it should always be NULL).

Reported-By: Robert Swiecki <swiecki@google.com>
Change-Id: Ib901b5f82e5cf818060ef47a9585363e05dd9932
Reviewed-on: https://boringssl-review.googlesource.com/13631
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>
2017-02-06 18:42:53 +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 (c) 1998-2006 The OpenSSL Project. All rights reserved.
*
* 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 above 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 acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
*
* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For written permission, please contact
* openssl-core@openssl.org.
*
* 5. Products derived from this software may not be called "OpenSSL"
* nor may "OpenSSL" appear in their names without prior written
* permission of the OpenSSL Project.
*
* 6. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit (http://www.openssl.org/)"
*
* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
* EXPRESSED 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 OpenSSL PROJECT OR
* ITS 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.
* ====================================================================
*
* This product includes cryptographic software written by Eric Young
* (eay@cryptsoft.com). This product includes software written by Tim
* Hudson (tjh@cryptsoft.com).
*
*/
/* ====================================================================
* 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 <assert.h>
#include <stdlib.h>
#include <string.h>
#include <openssl/err.h>
#include <openssl/lhash.h>
#include <openssl/mem.h>
#include <openssl/rand.h>
#include "internal.h"
#include "../crypto/internal.h"
/* The address of this is a magic value, a pointer to which is returned by
* SSL_magic_pending_session_ptr(). It allows a session callback to indicate
* that it needs to asynchronously fetch session information. */
static const char g_pending_session_magic = 0;
static CRYPTO_EX_DATA_CLASS g_ex_data_class =
CRYPTO_EX_DATA_CLASS_INIT_WITH_APP_DATA;
static void SSL_SESSION_list_remove(SSL_CTX *ctx, SSL_SESSION *session);
static void SSL_SESSION_list_add(SSL_CTX *ctx, SSL_SESSION *session);
static int remove_session_lock(SSL_CTX *ctx, SSL_SESSION *session, int lock);
SSL_SESSION *SSL_SESSION_new(void) {
SSL_SESSION *session = OPENSSL_malloc(sizeof(SSL_SESSION));
if (session == NULL) {
OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE);
return 0;
}
OPENSSL_memset(session, 0, sizeof(SSL_SESSION));
session->verify_result = X509_V_ERR_INVALID_CALL;
session->references = 1;
session->timeout = SSL_DEFAULT_SESSION_TIMEOUT;
session->auth_timeout = SSL_DEFAULT_SESSION_TIMEOUT;
session->time = (long)time(NULL);
CRYPTO_new_ex_data(&session->ex_data);
return session;
}
SSL_SESSION *SSL_SESSION_dup(SSL_SESSION *session, int dup_flags) {
SSL_SESSION *new_session = SSL_SESSION_new();
if (new_session == NULL) {
goto err;
}
new_session->is_server = session->is_server;
new_session->ssl_version = session->ssl_version;
new_session->sid_ctx_length = session->sid_ctx_length;
OPENSSL_memcpy(new_session->sid_ctx, session->sid_ctx, session->sid_ctx_length);
/* Copy the key material. */
new_session->master_key_length = session->master_key_length;
OPENSSL_memcpy(new_session->master_key, session->master_key,
session->master_key_length);
new_session->cipher = session->cipher;
/* Copy authentication state. */
if (session->psk_identity != NULL) {
new_session->psk_identity = BUF_strdup(session->psk_identity);
if (new_session->psk_identity == NULL) {
goto err;
}
}
if (session->certs != NULL) {
new_session->certs = sk_CRYPTO_BUFFER_new_null();
if (new_session->certs == NULL) {
goto err;
}
for (size_t i = 0; i < sk_CRYPTO_BUFFER_num(session->certs); i++) {
CRYPTO_BUFFER *buffer = sk_CRYPTO_BUFFER_value(session->certs, i);
if (!sk_CRYPTO_BUFFER_push(new_session->certs, buffer)) {
goto err;
}
CRYPTO_BUFFER_up_ref(buffer);
}
}
if (session->x509_peer != NULL) {
X509_up_ref(session->x509_peer);
new_session->x509_peer = session->x509_peer;
}
if (session->x509_chain != NULL) {
new_session->x509_chain = X509_chain_up_ref(session->x509_chain);
if (new_session->x509_chain == NULL) {
goto err;
}
}
new_session->verify_result = session->verify_result;
new_session->ocsp_response_length = session->ocsp_response_length;
if (session->ocsp_response != NULL) {
new_session->ocsp_response = BUF_memdup(session->ocsp_response,
session->ocsp_response_length);
if (new_session->ocsp_response == NULL) {
goto err;
}
}
new_session->tlsext_signed_cert_timestamp_list_length =
session->tlsext_signed_cert_timestamp_list_length;
if (session->tlsext_signed_cert_timestamp_list != NULL) {
new_session->tlsext_signed_cert_timestamp_list =
BUF_memdup(session->tlsext_signed_cert_timestamp_list,
session->tlsext_signed_cert_timestamp_list_length);
if (new_session->tlsext_signed_cert_timestamp_list == NULL) {
goto err;
}
}
OPENSSL_memcpy(new_session->peer_sha256, session->peer_sha256,
SHA256_DIGEST_LENGTH);
new_session->peer_sha256_valid = session->peer_sha256_valid;
if (session->tlsext_hostname != NULL) {
new_session->tlsext_hostname = BUF_strdup(session->tlsext_hostname);
if (new_session->tlsext_hostname == NULL) {
goto err;
}
}
new_session->peer_signature_algorithm = session->peer_signature_algorithm;
new_session->timeout = session->timeout;
new_session->auth_timeout = session->auth_timeout;
new_session->time = session->time;
/* Copy non-authentication connection properties. */
if (dup_flags & SSL_SESSION_INCLUDE_NONAUTH) {
new_session->session_id_length = session->session_id_length;
OPENSSL_memcpy(new_session->session_id, session->session_id,
session->session_id_length);
new_session->group_id = session->group_id;
OPENSSL_memcpy(new_session->original_handshake_hash,
session->original_handshake_hash,
session->original_handshake_hash_len);
new_session->original_handshake_hash_len =
session->original_handshake_hash_len;
new_session->tlsext_tick_lifetime_hint = session->tlsext_tick_lifetime_hint;
new_session->ticket_age_add = session->ticket_age_add;
new_session->ticket_max_early_data = session->ticket_max_early_data;
new_session->extended_master_secret = session->extended_master_secret;
}
/* Copy the ticket. */
if (dup_flags & SSL_SESSION_INCLUDE_TICKET) {
if (session->tlsext_tick != NULL) {
new_session->tlsext_tick =
BUF_memdup(session->tlsext_tick, session->tlsext_ticklen);
if (new_session->tlsext_tick == NULL) {
goto err;
}
}
new_session->tlsext_ticklen = session->tlsext_ticklen;
}
/* The new_session does not get a copy of the ex_data. */
new_session->not_resumable = 1;
return new_session;
err:
SSL_SESSION_free(new_session);
OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE);
return 0;
}
void ssl_session_rebase_time(SSL *ssl, SSL_SESSION *session) {
struct timeval now;
ssl_get_current_time(ssl, &now);
/* To avoid overflows and underflows, if we've gone back in time or any value
* is negative, update the time, but mark the session expired. */
if (session->time > now.tv_sec ||
session->time < 0 ||
now.tv_sec < 0) {
session->time = now.tv_sec;
session->timeout = 0;
session->auth_timeout = 0;
return;
}
/* Adjust the session time and timeouts. If the session has already expired,
* clamp the timeouts at zero. */
long delta = now.tv_sec - session->time;
session->time = now.tv_sec;
if (session->timeout < delta) {
session->timeout = 0;
} else {
session->timeout -= delta;
}
if (session->auth_timeout < delta) {
session->auth_timeout = 0;
} else {
session->auth_timeout -= delta;
}
}
void ssl_session_renew_timeout(SSL *ssl, SSL_SESSION *session, long timeout) {
/* Rebase the timestamp relative to the current time so |timeout| is measured
* correctly. */
ssl_session_rebase_time(ssl, session);
if (session->timeout > timeout) {
return;
}
session->timeout = timeout;
if (session->timeout > session->auth_timeout) {
session->timeout = session->auth_timeout;
}
}
int SSL_SESSION_up_ref(SSL_SESSION *session) {
CRYPTO_refcount_inc(&session->references);
return 1;
}
void SSL_SESSION_free(SSL_SESSION *session) {
if (session == NULL ||
!CRYPTO_refcount_dec_and_test_zero(&session->references)) {
return;
}
CRYPTO_free_ex_data(&g_ex_data_class, session, &session->ex_data);
OPENSSL_cleanse(session->master_key, sizeof(session->master_key));
OPENSSL_cleanse(session->session_id, sizeof(session->session_id));
sk_CRYPTO_BUFFER_pop_free(session->certs, CRYPTO_BUFFER_free);
X509_free(session->x509_peer);
sk_X509_pop_free(session->x509_chain, X509_free);
sk_X509_pop_free(session->x509_chain_without_leaf, X509_free);
OPENSSL_free(session->tlsext_hostname);
OPENSSL_free(session->tlsext_tick);
OPENSSL_free(session->tlsext_signed_cert_timestamp_list);
OPENSSL_free(session->ocsp_response);
OPENSSL_free(session->psk_identity);
OPENSSL_cleanse(session, sizeof(*session));
OPENSSL_free(session);
}
const uint8_t *SSL_SESSION_get_id(const SSL_SESSION *session,
unsigned *out_len) {
if (out_len != NULL) {
*out_len = session->session_id_length;
}
return session->session_id;
}
long SSL_SESSION_get_timeout(const SSL_SESSION *session) {
return session->timeout;
}
long SSL_SESSION_get_time(const SSL_SESSION *session) {
if (session == NULL) {
/* NULL should crash, but silently accept it here for compatibility. */
return 0;
}
return session->time;
}
X509 *SSL_SESSION_get0_peer(const SSL_SESSION *session) {
return session->x509_peer;
}
size_t SSL_SESSION_get_master_key(const SSL_SESSION *session, uint8_t *out,
size_t max_out) {
/* TODO(davidben): Fix master_key_length's type and remove these casts. */
if (max_out == 0) {
return (size_t)session->master_key_length;
}
if (max_out > (size_t)session->master_key_length) {
max_out = (size_t)session->master_key_length;
}
OPENSSL_memcpy(out, session->master_key, max_out);
return max_out;
}
long SSL_SESSION_set_time(SSL_SESSION *session, long time) {
if (session == NULL) {
return 0;
}
session->time = time;
return time;
}
long SSL_SESSION_set_timeout(SSL_SESSION *session, long timeout) {
if (session == NULL) {
return 0;
}
session->timeout = timeout;
session->auth_timeout = timeout;
return 1;
}
int SSL_SESSION_set1_id_context(SSL_SESSION *session, const uint8_t *sid_ctx,
size_t sid_ctx_len) {
if (sid_ctx_len > sizeof(session->sid_ctx)) {
OPENSSL_PUT_ERROR(SSL, SSL_R_SSL_SESSION_ID_CONTEXT_TOO_LONG);
return 0;
}
assert(sizeof(session->sid_ctx) < 256);
session->sid_ctx_length = (uint8_t)sid_ctx_len;
OPENSSL_memcpy(session->sid_ctx, sid_ctx, sid_ctx_len);
return 1;
}
SSL_SESSION *SSL_magic_pending_session_ptr(void) {
return (SSL_SESSION *)&g_pending_session_magic;
}
SSL_SESSION *SSL_get_session(const SSL *ssl) {
/* Once the handshake completes we return the established session. Otherwise
* we return the intermediate session, either |session| (for resumption) or
* |new_session| if doing a full handshake. */
if (!SSL_in_init(ssl)) {
return ssl->s3->established_session;
}
if (ssl->s3->new_session != NULL) {
return ssl->s3->new_session;
}
return ssl->session;
}
SSL_SESSION *SSL_get1_session(SSL *ssl) {
SSL_SESSION *ret = SSL_get_session(ssl);
if (ret != NULL) {
SSL_SESSION_up_ref(ret);
}
return ret;
}
int SSL_SESSION_get_ex_new_index(long argl, void *argp,
CRYPTO_EX_unused *unused,
CRYPTO_EX_dup *dup_func,
CRYPTO_EX_free *free_func) {
int index;
if (!CRYPTO_get_ex_new_index(&g_ex_data_class, &index, argl, argp, dup_func,
free_func)) {
return -1;
}
return index;
}
int SSL_SESSION_set_ex_data(SSL_SESSION *session, int idx, void *arg) {
return CRYPTO_set_ex_data(&session->ex_data, idx, arg);
}
void *SSL_SESSION_get_ex_data(const SSL_SESSION *session, int idx) {
return CRYPTO_get_ex_data(&session->ex_data, idx);
}
int ssl_get_new_session(SSL_HANDSHAKE *hs, int is_server) {
SSL *const ssl = hs->ssl;
if (ssl->mode & SSL_MODE_NO_SESSION_CREATION) {
OPENSSL_PUT_ERROR(SSL, SSL_R_SESSION_MAY_NOT_BE_CREATED);
return 0;
}
SSL_SESSION *session = SSL_SESSION_new();
if (session == NULL) {
return 0;
}
session->is_server = is_server;
session->ssl_version = ssl->version;
/* Fill in the time from the |SSL_CTX|'s clock. */
struct timeval now;
ssl_get_current_time(ssl, &now);
session->time = now.tv_sec;
uint16_t version = ssl3_protocol_version(ssl);
if (version >= TLS1_3_VERSION) {
/* TLS 1.3 uses tickets as authenticators, so we are willing to use them for
* longer. */
session->timeout = ssl->session_psk_dhe_timeout;
session->auth_timeout = SSL_DEFAULT_SESSION_AUTH_TIMEOUT;
} else {
/* TLS 1.2 resumption does not incorporate new key material, so we use a
* much shorter timeout. */
session->timeout = ssl->session_timeout;
session->auth_timeout = ssl->session_timeout;
}
if (is_server) {
if (hs->ticket_expected || version >= TLS1_3_VERSION) {
/* Don't set session IDs for sessions resumed with tickets. This will keep
* them out of the session cache. */
session->session_id_length = 0;
} else {
session->session_id_length = SSL3_SSL_SESSION_ID_LENGTH;
if (!RAND_bytes(session->session_id, session->session_id_length)) {
goto err;
}
}
} else {
session->session_id_length = 0;
}
if (ssl->sid_ctx_length > sizeof(session->sid_ctx)) {
OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR);
goto err;
}
OPENSSL_memcpy(session->sid_ctx, ssl->sid_ctx, ssl->sid_ctx_length);
session->sid_ctx_length = ssl->sid_ctx_length;
/* The session is marked not resumable until it is completely filled in. */
session->not_resumable = 1;
session->verify_result = X509_V_ERR_INVALID_CALL;
SSL_SESSION_free(ssl->s3->new_session);
ssl->s3->new_session = session;
ssl_set_session(ssl, NULL);
return 1;
err:
SSL_SESSION_free(session);
return 0;
}
int ssl_session_x509_cache_objects(SSL_SESSION *sess) {
STACK_OF(X509) *chain = NULL;
const size_t num_certs = sk_CRYPTO_BUFFER_num(sess->certs);
if (num_certs > 0) {
chain = sk_X509_new_null();
if (chain == NULL) {
OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE);
goto err;
}
}
X509 *leaf = NULL;
for (size_t i = 0; i < num_certs; i++) {
X509 *x509 = X509_parse_from_buffer(sk_CRYPTO_BUFFER_value(sess->certs, i));
if (x509 == NULL) {
OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR);
goto err;
}
if (!sk_X509_push(chain, x509)) {
OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE);
X509_free(x509);
goto err;
}
if (i == 0) {
leaf = x509;
}
}
sk_X509_pop_free(sess->x509_chain, X509_free);
sess->x509_chain = chain;
sk_X509_pop_free(sess->x509_chain_without_leaf, X509_free);
sess->x509_chain_without_leaf = NULL;
X509_free(sess->x509_peer);
if (leaf != NULL) {
X509_up_ref(leaf);
}
sess->x509_peer = leaf;
return 1;
err:
sk_X509_pop_free(chain, X509_free);
return 0;
}
int ssl_encrypt_ticket(SSL *ssl, CBB *out, const SSL_SESSION *session) {
int ret = 0;
/* Serialize the SSL_SESSION to be encoded into the ticket. */
uint8_t *session_buf = NULL;
size_t session_len;
if (!SSL_SESSION_to_bytes_for_ticket(session, &session_buf, &session_len)) {
return -1;
}
EVP_CIPHER_CTX ctx;
EVP_CIPHER_CTX_init(&ctx);
HMAC_CTX hctx;
HMAC_CTX_init(&hctx);
/* If the session is too long, emit a dummy value rather than abort the
* connection. */
static const size_t kMaxTicketOverhead =
16 + EVP_MAX_IV_LENGTH + EVP_MAX_BLOCK_LENGTH + EVP_MAX_MD_SIZE;
if (session_len > 0xffff - kMaxTicketOverhead) {
static const char kTicketPlaceholder[] = "TICKET TOO LARGE";
if (CBB_add_bytes(out, (const uint8_t *)kTicketPlaceholder,
strlen(kTicketPlaceholder))) {
ret = 1;
}
goto err;
}
/* Initialize HMAC and cipher contexts. If callback present it does all the
* work otherwise use generated values from parent ctx. */
SSL_CTX *tctx = ssl->initial_ctx;
uint8_t iv[EVP_MAX_IV_LENGTH];
uint8_t key_name[16];
if (tctx->tlsext_ticket_key_cb != NULL) {
if (tctx->tlsext_ticket_key_cb(ssl, key_name, iv, &ctx, &hctx,
1 /* encrypt */) < 0) {
goto err;
}
} else {
if (!RAND_bytes(iv, 16) ||
!EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
tctx->tlsext_tick_aes_key, iv) ||
!HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16, tlsext_tick_md(),
NULL)) {
goto err;
}
OPENSSL_memcpy(key_name, tctx->tlsext_tick_key_name, 16);
}
uint8_t *ptr;
if (!CBB_add_bytes(out, key_name, 16) ||
!CBB_add_bytes(out, iv, EVP_CIPHER_CTX_iv_length(&ctx)) ||
!CBB_reserve(out, &ptr, session_len + EVP_MAX_BLOCK_LENGTH)) {
goto err;
}
size_t total = 0;
#if defined(BORINGSSL_UNSAFE_FUZZER_MODE)
OPENSSL_memcpy(ptr, session_buf, session_len);
total = session_len;
#else
int len;
if (!EVP_EncryptUpdate(&ctx, ptr + total, &len, session_buf, session_len)) {
goto err;
}
total += len;
if (!EVP_EncryptFinal_ex(&ctx, ptr + total, &len)) {
goto err;
}
total += len;
#endif
if (!CBB_did_write(out, total)) {
goto err;
}
unsigned hlen;
if (!HMAC_Update(&hctx, CBB_data(out), CBB_len(out)) ||
!CBB_reserve(out, &ptr, EVP_MAX_MD_SIZE) ||
!HMAC_Final(&hctx, ptr, &hlen) ||
!CBB_did_write(out, hlen)) {
goto err;
}
ret = 1;
err:
OPENSSL_free(session_buf);
EVP_CIPHER_CTX_cleanup(&ctx);
HMAC_CTX_cleanup(&hctx);
return ret;
}
int ssl_session_is_context_valid(const SSL *ssl, const SSL_SESSION *session) {
if (session == NULL) {
return 0;
}
return session->sid_ctx_length == ssl->sid_ctx_length &&
OPENSSL_memcmp(session->sid_ctx, ssl->sid_ctx, ssl->sid_ctx_length) ==
0;
}
int ssl_session_is_time_valid(const SSL *ssl, const SSL_SESSION *session) {
if (session == NULL) {
return 0;
}
struct timeval now;
ssl_get_current_time(ssl, &now);
/* Reject tickets from the future to avoid underflow. */
if ((long)now.tv_sec < session->time) {
return 0;
}
return session->timeout > (long)now.tv_sec - session->time;
}
int ssl_session_is_resumable(const SSL *ssl, const SSL_SESSION *session) {
return ssl_session_is_context_valid(ssl, session) &&
/* The session must have been created by the same type of end point as
* we're now using it with. */
session->is_server == ssl->server &&
/* The session must not be expired. */
ssl_session_is_time_valid(ssl, session) &&
/* Only resume if the session's version matches the negotiated
* version. */
ssl->version == session->ssl_version &&
/* Only resume if the session's cipher matches the negotiated one. */
ssl->s3->tmp.new_cipher == session->cipher &&
/* If the session contains a client certificate (either the full
* certificate or just the hash) then require that the form of the
* certificate matches the current configuration. */
((session->x509_peer == NULL && !session->peer_sha256_valid) ||
session->peer_sha256_valid ==
ssl->retain_only_sha256_of_client_certs);
}
/* ssl_lookup_session looks up |session_id| in the session cache and sets
* |*out_session| to an |SSL_SESSION| object if found. The caller takes
* ownership of the result. */
static enum ssl_session_result_t ssl_lookup_session(
SSL *ssl, SSL_SESSION **out_session, const uint8_t *session_id,
size_t session_id_len) {
*out_session = NULL;
if (session_id_len == 0 || session_id_len > SSL_MAX_SSL_SESSION_ID_LENGTH) {
return ssl_session_success;
}
SSL_SESSION *session = NULL;
/* Try the internal cache, if it exists. */
if (!(ssl->initial_ctx->session_cache_mode &
SSL_SESS_CACHE_NO_INTERNAL_LOOKUP)) {
SSL_SESSION data;
data.ssl_version = ssl->version;
data.session_id_length = session_id_len;
OPENSSL_memcpy(data.session_id, session_id, session_id_len);
CRYPTO_MUTEX_lock_read(&ssl->initial_ctx->lock);
session = lh_SSL_SESSION_retrieve(ssl->initial_ctx->sessions, &data);
if (session != NULL) {
SSL_SESSION_up_ref(session);
}
/* TODO(davidben): This should probably move it to the front of the list. */
CRYPTO_MUTEX_unlock_read(&ssl->initial_ctx->lock);
}
/* Fall back to the external cache, if it exists. */
if (session == NULL &&
ssl->initial_ctx->get_session_cb != NULL) {
int copy = 1;
session = ssl->initial_ctx->get_session_cb(ssl, (uint8_t *)session_id,
session_id_len, &copy);
if (session == NULL) {
return ssl_session_success;
}
if (session == SSL_magic_pending_session_ptr()) {
return ssl_session_retry;
}
/* Increment reference count now if the session callback asks us to do so
* (note that if the session structures returned by the callback are shared
* between threads, it must handle the reference count itself [i.e. copy ==
* 0], or things won't be thread-safe). */
if (copy) {
SSL_SESSION_up_ref(session);
}
/* Add the externally cached session to the internal cache if necessary. */
if (!(ssl->initial_ctx->session_cache_mode &
SSL_SESS_CACHE_NO_INTERNAL_STORE)) {
SSL_CTX_add_session(ssl->initial_ctx, session);
}
}
if (session != NULL &&
!ssl_session_is_time_valid(ssl, session)) {
/* The session was from the cache, so remove it. */
SSL_CTX_remove_session(ssl->initial_ctx, session);
SSL_SESSION_free(session);
session = NULL;
}
*out_session = session;
return ssl_session_success;
}
enum ssl_session_result_t ssl_get_prev_session(
SSL *ssl, SSL_SESSION **out_session, int *out_tickets_supported,
int *out_renew_ticket, const SSL_CLIENT_HELLO *client_hello) {
/* This is used only by servers. */
assert(ssl->server);
SSL_SESSION *session = NULL;
int renew_ticket = 0;
/* If tickets are disabled, always behave as if no tickets are present. */
const uint8_t *ticket = NULL;
size_t ticket_len = 0;
const int tickets_supported =
!(SSL_get_options(ssl) & SSL_OP_NO_TICKET) &&
ssl->version > SSL3_VERSION &&
SSL_early_callback_ctx_extension_get(
client_hello, TLSEXT_TYPE_session_ticket, &ticket, &ticket_len);
if (tickets_supported && ticket_len > 0) {
if (!tls_process_ticket(ssl, &session, &renew_ticket, ticket, ticket_len,
client_hello->session_id,
client_hello->session_id_len)) {
return ssl_session_error;
}
} else {
/* The client didn't send a ticket, so the session ID is a real ID. */
enum ssl_session_result_t lookup_ret = ssl_lookup_session(
ssl, &session, client_hello->session_id, client_hello->session_id_len);
if (lookup_ret != ssl_session_success) {
return lookup_ret;
}
}
*out_session = session;
*out_tickets_supported = tickets_supported;
*out_renew_ticket = renew_ticket;
return ssl_session_success;
}
int SSL_CTX_add_session(SSL_CTX *ctx, SSL_SESSION *session) {
/* Although |session| is inserted into two structures (a doubly-linked list
* and the hash table), |ctx| only takes one reference. */
SSL_SESSION_up_ref(session);
SSL_SESSION *old_session;
CRYPTO_MUTEX_lock_write(&ctx->lock);
if (!lh_SSL_SESSION_insert(ctx->sessions, &old_session, session)) {
CRYPTO_MUTEX_unlock_write(&ctx->lock);
SSL_SESSION_free(session);
return 0;
}
if (old_session != NULL) {
if (old_session == session) {
/* |session| was already in the cache. */
CRYPTO_MUTEX_unlock_write(&ctx->lock);
SSL_SESSION_free(old_session);
return 0;
}
/* There was a session ID collision. |old_session| must be removed from
* the linked list and released. */
SSL_SESSION_list_remove(ctx, old_session);
SSL_SESSION_free(old_session);
}
SSL_SESSION_list_add(ctx, session);
/* Enforce any cache size limits. */
if (SSL_CTX_sess_get_cache_size(ctx) > 0) {
while (SSL_CTX_sess_number(ctx) > SSL_CTX_sess_get_cache_size(ctx)) {
if (!remove_session_lock(ctx, ctx->session_cache_tail, 0)) {
break;
}
}
}
CRYPTO_MUTEX_unlock_write(&ctx->lock);
return 1;
}
int SSL_CTX_remove_session(SSL_CTX *ctx, SSL_SESSION *session) {
return remove_session_lock(ctx, session, 1);
}
static int remove_session_lock(SSL_CTX *ctx, SSL_SESSION *session, int lock) {
int ret = 0;
if (session != NULL && session->session_id_length != 0) {
if (lock) {
CRYPTO_MUTEX_lock_write(&ctx->lock);
}
SSL_SESSION *found_session = lh_SSL_SESSION_retrieve(ctx->sessions,
session);
if (found_session == session) {
ret = 1;
found_session = lh_SSL_SESSION_delete(ctx->sessions, session);
SSL_SESSION_list_remove(ctx, session);
}
if (lock) {
CRYPTO_MUTEX_unlock_write(&ctx->lock);
}
if (ret) {
found_session->not_resumable = 1;
if (ctx->remove_session_cb != NULL) {
ctx->remove_session_cb(ctx, found_session);
}
SSL_SESSION_free(found_session);
}
}
return ret;
}
int SSL_set_session(SSL *ssl, SSL_SESSION *session) {
/* SSL_set_session may only be called before the handshake has started. */
if (SSL_state(ssl) != SSL_ST_INIT || ssl->s3->initial_handshake_complete) {
abort();
}
ssl_set_session(ssl, session);
return 1;
}
void ssl_set_session(SSL *ssl, SSL_SESSION *session) {
if (ssl->session == session) {
return;
}
SSL_SESSION_free(ssl->session);
ssl->session = session;
if (session != NULL) {
SSL_SESSION_up_ref(session);
}
}
long SSL_CTX_set_timeout(SSL_CTX *ctx, long timeout) {
if (ctx == NULL) {
return 0;
}
/* Historically, zero was treated as |SSL_DEFAULT_SESSION_TIMEOUT|. */
if (timeout == 0) {
timeout = SSL_DEFAULT_SESSION_TIMEOUT;
}
long old_timeout = ctx->session_timeout;
ctx->session_timeout = timeout;
return old_timeout;
}
long SSL_CTX_get_timeout(const SSL_CTX *ctx) {
if (ctx == NULL) {
return 0;
}
return ctx->session_timeout;
}
void SSL_CTX_set_session_psk_dhe_timeout(SSL_CTX *ctx, long timeout) {
ctx->session_psk_dhe_timeout = timeout;
}
long SSL_set_session_timeout(SSL *ssl, long timeout) {
long old_timeout = ssl->session_timeout;
ssl->session_timeout = timeout;
return old_timeout;
}
void SSL_set_session_psk_dhe_timeout(SSL *ssl, long timeout) {
ssl->session_psk_dhe_timeout = timeout;
}
typedef struct timeout_param_st {
SSL_CTX *ctx;
long time;
LHASH_OF(SSL_SESSION) *cache;
} TIMEOUT_PARAM;
static void timeout_doall_arg(SSL_SESSION *session, void *void_param) {
TIMEOUT_PARAM *param = void_param;
if (param->time == 0 ||
param->time > (session->time + session->timeout)) {
/* timeout */
/* The reason we don't call SSL_CTX_remove_session() is to
* save on locking overhead */
(void) lh_SSL_SESSION_delete(param->cache, session);
SSL_SESSION_list_remove(param->ctx, session);
session->not_resumable = 1;
if (param->ctx->remove_session_cb != NULL) {
param->ctx->remove_session_cb(param->ctx, session);
}
SSL_SESSION_free(session);
}
}
void SSL_CTX_flush_sessions(SSL_CTX *ctx, long time) {
TIMEOUT_PARAM tp;
tp.ctx = ctx;
tp.cache = ctx->sessions;
if (tp.cache == NULL) {
return;
}
tp.time = time;
CRYPTO_MUTEX_lock_write(&ctx->lock);
lh_SSL_SESSION_doall_arg(tp.cache, timeout_doall_arg, &tp);
CRYPTO_MUTEX_unlock_write(&ctx->lock);
}
/* locked by SSL_CTX in the calling function */
static void SSL_SESSION_list_remove(SSL_CTX *ctx, SSL_SESSION *session) {
if (session->next == NULL || session->prev == NULL) {
return;
}
if (session->next == (SSL_SESSION *)&ctx->session_cache_tail) {
/* last element in list */
if (session->prev == (SSL_SESSION *)&ctx->session_cache_head) {
/* only one element in list */
ctx->session_cache_head = NULL;
ctx->session_cache_tail = NULL;
} else {
ctx->session_cache_tail = session->prev;
session->prev->next = (SSL_SESSION *)&(ctx->session_cache_tail);
}
} else {
if (session->prev == (SSL_SESSION *)&ctx->session_cache_head) {
/* first element in list */
ctx->session_cache_head = session->next;
session->next->prev = (SSL_SESSION *)&(ctx->session_cache_head);
} else { /* middle of list */
session->next->prev = session->prev;
session->prev->next = session->next;
}
}
session->prev = session->next = NULL;
}
static void SSL_SESSION_list_add(SSL_CTX *ctx, SSL_SESSION *session) {
if (session->next != NULL && session->prev != NULL) {
SSL_SESSION_list_remove(ctx, session);
}
if (ctx->session_cache_head == NULL) {
ctx->session_cache_head = session;
ctx->session_cache_tail = session;
session->prev = (SSL_SESSION *)&(ctx->session_cache_head);
session->next = (SSL_SESSION *)&(ctx->session_cache_tail);
} else {
session->next = ctx->session_cache_head;
session->next->prev = session;
session->prev = (SSL_SESSION *)&(ctx->session_cache_head);
ctx->session_cache_head = session;
}
}
void SSL_CTX_sess_set_new_cb(SSL_CTX *ctx,
int (*cb)(SSL *ssl, SSL_SESSION *session)) {
ctx->new_session_cb = cb;
}
int (*SSL_CTX_sess_get_new_cb(SSL_CTX *ctx))(SSL *ssl, SSL_SESSION *session) {
return ctx->new_session_cb;
}
void SSL_CTX_sess_set_remove_cb(
SSL_CTX *ctx, void (*cb)(SSL_CTX *ctx, SSL_SESSION *session)) {
ctx->remove_session_cb = cb;
}
void (*SSL_CTX_sess_get_remove_cb(SSL_CTX *ctx))(SSL_CTX *ctx,
SSL_SESSION *session) {
return ctx->remove_session_cb;
}
void SSL_CTX_sess_set_get_cb(SSL_CTX *ctx,
SSL_SESSION *(*cb)(SSL *ssl,
uint8_t *id, int id_len,
int *out_copy)) {
ctx->get_session_cb = cb;
}
SSL_SESSION *(*SSL_CTX_sess_get_get_cb(SSL_CTX *ctx))(
SSL *ssl, uint8_t *id, int id_len, int *out_copy) {
return ctx->get_session_cb;
}
void SSL_CTX_set_info_callback(
SSL_CTX *ctx, void (*cb)(const SSL *ssl, int type, int value)) {
ctx->info_callback = cb;
}
void (*SSL_CTX_get_info_callback(SSL_CTX *ctx))(const SSL *ssl, int type,
int value) {
return ctx->info_callback;
}
void SSL_CTX_set_channel_id_cb(SSL_CTX *ctx,
void (*cb)(SSL *ssl, EVP_PKEY **pkey)) {
ctx->channel_id_cb = cb;
}
void (*SSL_CTX_get_channel_id_cb(SSL_CTX *ctx))(SSL *ssl, EVP_PKEY **pkey) {
return ctx->channel_id_cb;
}
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