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Merge pull request #8280 from gilles-peskine-arm/ssl_cache-negative_errors-2.28

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Backport 2.28: ssl_cache: misc improvements
This commit is contained in:
Dave Rodgman 2023-09-29 17:58:10 +00:00 committed by GitHub
commit da635ab657
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GPG Key ID: 4AEE18F83AFDEB23
5 changed files with 32 additions and 16 deletions
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4
ChangeLog.d/MBEDTLS_ERR_SSL_CACHE_ENTRY_NOT_FOUND.txt Normal file
View File

@ -0,0 +1,4 @@
Bugfix
* Functions in the ssl_cache module now return a negative MBEDTLS_ERR_xxx
error code on failure. Before, they returned 1 to indicate failure in
some cases involving a missing entry or a full cache.

2
include/mbedtls/ssl.h
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@ -193,6 +193,8 @@
#define MBEDTLS_ERR_SSL_CRYPTO_IN_PROGRESS -0x7000
/** Invalid value in SSL config */
#define MBEDTLS_ERR_SSL_BAD_CONFIG -0x5E80
/** Cache entry not found */
#define MBEDTLS_ERR_SSL_CACHE_ENTRY_NOT_FOUND -0x5E00
/*
* Various constants

8
include/mbedtls/ssl_cache.h
View File

@ -99,6 +99,11 @@ void mbedtls_ssl_cache_init(mbedtls_ssl_cache_context *cache);
*
* \param data SSL cache context
* \param session session to retrieve entry for
*
* \return \c 0 on success.
* \return #MBEDTLS_ERR_SSL_CACHE_ENTRY_NOT_FOUND if there is
* no cache entry with specified session ID found, or
* any other negative error code for other failures.
*/
int mbedtls_ssl_cache_get(void *data, mbedtls_ssl_session *session);
@ -108,6 +113,9 @@ int mbedtls_ssl_cache_get(void *data, mbedtls_ssl_session *session);
*
* \param data SSL cache context
* \param session session to store entry for
*
* \return \c 0 on success.
* \return A negative error code on failure.
*/
int mbedtls_ssl_cache_set(void *data, const mbedtls_ssl_session *session);

2
library/error.c
View File

@ -518,6 +518,8 @@ const char *mbedtls_high_level_strerr(int error_code)
return( "SSL - A cryptographic operation is in progress. Try again later" );
case -(MBEDTLS_ERR_SSL_BAD_CONFIG):
return( "SSL - Invalid value in SSL config" );
case -(MBEDTLS_ERR_SSL_CACHE_ENTRY_NOT_FOUND):
return( "SSL - Cache entry not found" );
#endif /* MBEDTLS_SSL_TLS_C */
#if defined(MBEDTLS_X509_USE_C) || defined(MBEDTLS_X509_CREATE_C)

32
library/ssl_cache.c
View File

@ -26,6 +26,7 @@
#if defined(MBEDTLS_SSL_CACHE_C)
#include "mbedtls/platform.h"
#include "mbedtls/error.h"
#include "mbedtls/ssl_cache.h"
#include "mbedtls/ssl_internal.h"
@ -46,7 +47,7 @@ void mbedtls_ssl_cache_init(mbedtls_ssl_cache_context *cache)
int mbedtls_ssl_cache_get(void *data, mbedtls_ssl_session *session)
{
int ret = 1;
int ret = MBEDTLS_ERR_SSL_CACHE_ENTRY_NOT_FOUND;
#if defined(MBEDTLS_HAVE_TIME)
mbedtls_time_t t = mbedtls_time(NULL);
#endif
@ -54,8 +55,8 @@ int mbedtls_ssl_cache_get(void *data, mbedtls_ssl_session *session)
mbedtls_ssl_cache_entry *cur, *entry;
#if defined(MBEDTLS_THREADING_C)
if (mbedtls_mutex_lock(&cache->mutex) != 0) {
return 1;
if ((ret = mbedtls_mutex_lock(&cache->mutex)) != 0) {
return ret;
}
#endif
@ -81,7 +82,6 @@ int mbedtls_ssl_cache_get(void *data, mbedtls_ssl_session *session)
ret = mbedtls_ssl_session_copy(session, &entry->session);
if (ret != 0) {
ret = 1;
goto exit;
}
@ -97,16 +97,15 @@ int mbedtls_ssl_cache_get(void *data, mbedtls_ssl_session *session)
if ((session->peer_cert = mbedtls_calloc(1,
sizeof(mbedtls_x509_crt))) == NULL) {
ret = 1;
ret = MBEDTLS_ERR_SSL_ALLOC_FAILED;
goto exit;
}
mbedtls_x509_crt_init(session->peer_cert);
if (mbedtls_x509_crt_parse(session->peer_cert, entry->peer_cert.p,
entry->peer_cert.len) != 0) {
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;
ret = 1;
goto exit;
}
}
@ -119,7 +118,7 @@ int mbedtls_ssl_cache_get(void *data, mbedtls_ssl_session *session)
exit:
#if defined(MBEDTLS_THREADING_C)
if (mbedtls_mutex_unlock(&cache->mutex) != 0) {
ret = 1;
ret = MBEDTLS_ERR_THREADING_MUTEX_ERROR;
}
#endif
@ -128,7 +127,7 @@ exit:
int mbedtls_ssl_cache_set(void *data, const mbedtls_ssl_session *session)
{
int ret = 1;
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;
@ -179,7 +178,9 @@ int mbedtls_ssl_cache_set(void *data, const mbedtls_ssl_session *session)
*/
if (count >= cache->max_entries) {
if (old == NULL) {
ret = 1;
/* This should only happen on an ill-configured cache
* with max_entries == 0. */
ret = MBEDTLS_ERR_SSL_INTERNAL_ERROR;
goto exit;
}
@ -192,7 +193,7 @@ int mbedtls_ssl_cache_set(void *data, const mbedtls_ssl_session *session)
*/
if (count >= cache->max_entries) {
if (cache->chain == NULL) {
ret = 1;
ret = MBEDTLS_ERR_SSL_INTERNAL_ERROR;
goto exit;
}
@ -208,7 +209,7 @@ int mbedtls_ssl_cache_set(void *data, const mbedtls_ssl_session *session)
*/
cur = mbedtls_calloc(1, sizeof(mbedtls_ssl_cache_entry));
if (cur == NULL) {
ret = 1;
ret = MBEDTLS_ERR_SSL_ALLOC_FAILED;
goto exit;
}
@ -242,7 +243,6 @@ int mbedtls_ssl_cache_set(void *data, const mbedtls_ssl_session *session)
* field anymore in the first place, and we're done after this call. */
ret = mbedtls_ssl_session_copy(&cur->session, session);
if (ret != 0) {
ret = 1;
goto exit;
}
@ -253,7 +253,7 @@ int mbedtls_ssl_cache_set(void *data, const mbedtls_ssl_session *session)
cur->peer_cert.p =
mbedtls_calloc(1, cur->session.peer_cert->raw.len);
if (cur->peer_cert.p == NULL) {
ret = 1;
ret = MBEDTLS_ERR_SSL_ALLOC_FAILED;
goto exit;
}
@ -273,7 +273,7 @@ int mbedtls_ssl_cache_set(void *data, const mbedtls_ssl_session *session)
exit:
#if defined(MBEDTLS_THREADING_C)
if (mbedtls_mutex_unlock(&cache->mutex) != 0) {
ret = 1;
ret = MBEDTLS_ERR_THREADING_MUTEX_ERROR;
}
#endif