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godot/thirdparty/mbedtls/library/ssl_cache.c

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/*
* SSL session cache implementation
*
* Copyright The Mbed TLS Contributors
* SPDX-License-Identifier: Apache-2.0
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may
* not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
* These session callbacks use a simple chained list
* to store and retrieve the session information.
*/
#include "common.h"
#if defined(MBEDTLS_SSL_CACHE_C)
#include "mbedtls/platform.h"
#include "mbedtls/error.h"
#include "mbedtls/ssl_cache.h"
#include "mbedtls/ssl_internal.h"
#include <string.h>
void mbedtls_ssl_cache_init(mbedtls_ssl_cache_context *cache)
{
memset(cache, 0, sizeof(mbedtls_ssl_cache_context));
cache->timeout = MBEDTLS_SSL_CACHE_DEFAULT_TIMEOUT;
cache->max_entries = MBEDTLS_SSL_CACHE_DEFAULT_MAX_ENTRIES;
#if defined(MBEDTLS_THREADING_C)
mbedtls_mutex_init(&cache->mutex);
#endif
}
int mbedtls_ssl_cache_get(void *data, mbedtls_ssl_session *session)
{
int ret = MBEDTLS_ERR_SSL_CACHE_ENTRY_NOT_FOUND;
#if defined(MBEDTLS_HAVE_TIME)
mbedtls_time_t t = mbedtls_time(NULL);
#endif
mbedtls_ssl_cache_context *cache = (mbedtls_ssl_cache_context *) data;
mbedtls_ssl_cache_entry *cur, *entry;
#if defined(MBEDTLS_THREADING_C)
if ((ret = mbedtls_mutex_lock(&cache->mutex)) != 0) {
return ret;
}
#endif
cur = cache->chain;
entry = NULL;
while (cur != NULL) {
entry = cur;
cur = cur->next;
#if defined(MBEDTLS_HAVE_TIME)
if (cache->timeout != 0 &&
(int) (t - entry->timestamp) > cache->timeout) {
continue;
}
#endif
if (session->id_len != entry->session.id_len ||
memcmp(session->id, entry->session.id,
entry->session.id_len) != 0) {
continue;
}
ret = mbedtls_ssl_session_copy(session, &entry->session);
if (ret != 0) {
goto exit;
}
#if defined(MBEDTLS_X509_CRT_PARSE_C) && \
defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE)
/*
* Restore peer certificate (without rest of the original chain)
*/
if (entry->peer_cert.p != NULL) {
/* `session->peer_cert` is NULL after the call to
* mbedtls_ssl_session_copy(), because cache entries
* have the `peer_cert` field set to NULL. */
if ((session->peer_cert = mbedtls_calloc(1,
sizeof(mbedtls_x509_crt))) == NULL) {
ret = MBEDTLS_ERR_SSL_ALLOC_FAILED;
goto exit;
}
mbedtls_x509_crt_init(session->peer_cert);
if ((ret = mbedtls_x509_crt_parse(session->peer_cert, entry->peer_cert.p,
entry->peer_cert.len)) != 0) {
mbedtls_free(session->peer_cert);
session->peer_cert = NULL;
goto exit;
}
}
#endif /* MBEDTLS_X509_CRT_PARSE_C && MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
ret = 0;
goto exit;
}
exit:
#if defined(MBEDTLS_THREADING_C)
if (mbedtls_mutex_unlock(&cache->mutex) != 0) {
ret = MBEDTLS_ERR_THREADING_MUTEX_ERROR;
}
#endif
return ret;
}
int mbedtls_ssl_cache_set(void *data, const mbedtls_ssl_session *session)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
#if defined(MBEDTLS_HAVE_TIME)
mbedtls_time_t t = mbedtls_time(NULL), oldest = 0;
mbedtls_ssl_cache_entry *old = NULL;
#endif
mbedtls_ssl_cache_context *cache = (mbedtls_ssl_cache_context *) data;
mbedtls_ssl_cache_entry *cur, *prv;
int count = 0;
#if defined(MBEDTLS_THREADING_C)
if ((ret = mbedtls_mutex_lock(&cache->mutex)) != 0) {
return ret;
}
#endif
cur = cache->chain;
prv = NULL;
while (cur != NULL) {
count++;
#if defined(MBEDTLS_HAVE_TIME)
if (cache->timeout != 0 &&
(int) (t - cur->timestamp) > cache->timeout) {
cur->timestamp = t;
break; /* expired, reuse this slot, update timestamp */
}
#endif
if (memcmp(session->id, cur->session.id, cur->session.id_len) == 0) {
break; /* client reconnected, keep timestamp for session id */
}
#if defined(MBEDTLS_HAVE_TIME)
if (oldest == 0 || cur->timestamp < oldest) {
oldest = cur->timestamp;
old = cur;
}
#endif
prv = cur;
cur = cur->next;
}
if (cur == NULL) {
#if defined(MBEDTLS_HAVE_TIME)
/*
* Reuse oldest entry if max_entries reached
*/
if (count >= cache->max_entries) {
if (old == NULL) {
/* This should only happen on an ill-configured cache
* with max_entries == 0. */
ret = MBEDTLS_ERR_SSL_INTERNAL_ERROR;
goto exit;
}
cur = old;
}
#else /* MBEDTLS_HAVE_TIME */
/*
* Reuse first entry in chain if max_entries reached,
* but move to last place
*/
if (count >= cache->max_entries) {
if (cache->chain == NULL) {
ret = MBEDTLS_ERR_SSL_INTERNAL_ERROR;
goto exit;
}
cur = cache->chain;
cache->chain = cur->next;
cur->next = NULL;
prv->next = cur;
}
#endif /* MBEDTLS_HAVE_TIME */
else {
/*
* max_entries not reached, create new entry
*/
cur = mbedtls_calloc(1, sizeof(mbedtls_ssl_cache_entry));
if (cur == NULL) {
ret = MBEDTLS_ERR_SSL_ALLOC_FAILED;
goto exit;
}
if (prv == NULL) {
cache->chain = cur;
} else {
prv->next = cur;
}
}
#if defined(MBEDTLS_HAVE_TIME)
cur->timestamp = t;
#endif
}
#if defined(MBEDTLS_X509_CRT_PARSE_C) && \
defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE)
/*
* If we're reusing an entry, free its certificate first
*/
if (cur->peer_cert.p != NULL) {
mbedtls_free(cur->peer_cert.p);
memset(&cur->peer_cert, 0, sizeof(mbedtls_x509_buf));
}
#endif /* MBEDTLS_X509_CRT_PARSE_C && MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
/* Copy the entire session; this temporarily makes a copy of the
* X.509 CRT structure even though we only want to store the raw CRT.
* This inefficiency will go away as soon as we implement on-demand
* parsing of CRTs, in which case there's no need for the `peer_cert`
* field anymore in the first place, and we're done after this call. */
ret = mbedtls_ssl_session_copy(&cur->session, session);
if (ret != 0) {
goto exit;
}
#if defined(MBEDTLS_X509_CRT_PARSE_C) && \
defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE)
/* If present, free the X.509 structure and only store the raw CRT data. */
if (cur->session.peer_cert != NULL) {
cur->peer_cert.p =
mbedtls_calloc(1, cur->session.peer_cert->raw.len);
if (cur->peer_cert.p == NULL) {
ret = MBEDTLS_ERR_SSL_ALLOC_FAILED;
goto exit;
}
memcpy(cur->peer_cert.p,
cur->session.peer_cert->raw.p,
cur->session.peer_cert->raw.len);
cur->peer_cert.len = session->peer_cert->raw.len;
mbedtls_x509_crt_free(cur->session.peer_cert);
mbedtls_free(cur->session.peer_cert);
cur->session.peer_cert = NULL;
}
#endif /* MBEDTLS_X509_CRT_PARSE_C && MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
ret = 0;
exit:
#if defined(MBEDTLS_THREADING_C)
if (mbedtls_mutex_unlock(&cache->mutex) != 0) {
ret = MBEDTLS_ERR_THREADING_MUTEX_ERROR;
}
#endif
return ret;
}
#if defined(MBEDTLS_HAVE_TIME)
void mbedtls_ssl_cache_set_timeout(mbedtls_ssl_cache_context *cache, int timeout)
{
if (timeout < 0) {
timeout = 0;
}
cache->timeout = timeout;
}
#endif /* MBEDTLS_HAVE_TIME */
void mbedtls_ssl_cache_set_max_entries(mbedtls_ssl_cache_context *cache, int max)
{
if (max < 0) {
max = 0;
}
cache->max_entries = max;
}
void mbedtls_ssl_cache_free(mbedtls_ssl_cache_context *cache)
{
mbedtls_ssl_cache_entry *cur, *prv;
cur = cache->chain;
while (cur != NULL) {
prv = cur;
cur = cur->next;
mbedtls_ssl_session_free(&prv->session);
#if defined(MBEDTLS_X509_CRT_PARSE_C) && \
defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE)
mbedtls_free(prv->peer_cert.p);
#endif /* MBEDTLS_X509_CRT_PARSE_C && MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
mbedtls_free(prv);
}
#if defined(MBEDTLS_THREADING_C)
mbedtls_mutex_free(&cache->mutex);
#endif
cache->chain = NULL;
}
#endif /* MBEDTLS_SSL_CACHE_C */
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