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Fix possible client crash on API misuse

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This commit is contained in:
Manuel Pégourié-Gonnard 2015-09-03 10:44:32 +02:00
parent 14d800507a
commit 7f2f062a5d
2 changed files with 23 additions and 0 deletions
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5
ChangeLog
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@ -6,6 +6,11 @@ Features
* Added support for yotta as a build system.
* Primary open source license changed to Apache 2.0 license.
Security
* Fix possible client-side NULL pointer dereference (read) when the client
tries to continue the handshake after it failed (a misuse of the API).
(Found by GDS Labs using afl-fuzz, patch provided by GDS Labs.)
Bugfix
* Fix segfault in the benchmark program when benchmarking DHM.
* Fix build error with CMake and pre-4.5 versions of GCC (found by Hugo

18
library/ssl_cli.c
View file

@ -1771,6 +1771,12 @@ static int ssl_write_encrypted_pms( mbedtls_ssl_context *ssl,
ssl->handshake->pmslen = 48;
if( ssl->session_negotiate->peer_cert == NULL )
{
MBEDTLS_SSL_DEBUG_MSG( 2, ( "certificate required" ) );
return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE );
}
/*
* Now write it out, encrypted
*/
@ -1873,6 +1879,12 @@ static int ssl_get_ecdh_params_from_cert( mbedtls_ssl_context *ssl )
int ret;
const mbedtls_ecp_keypair *peer_key;
if( ssl->session_negotiate->peer_cert == NULL )
{
MBEDTLS_SSL_DEBUG_MSG( 2, ( "certificate required" ) );
return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE );
}
if( ! mbedtls_pk_can_do( &ssl->session_negotiate->peer_cert->pk,
MBEDTLS_PK_ECKEY ) )
{
@ -2182,6 +2194,12 @@ static int ssl_parse_server_key_exchange( mbedtls_ssl_context *ssl )
MBEDTLS_SSL_DEBUG_BUF( 3, "parameters hash", hash, hashlen != 0 ? hashlen :
(unsigned int) ( mbedtls_md_get_size( mbedtls_md_info_from_type( md_alg ) ) ) );
if( ssl->session_negotiate->peer_cert == NULL )
{
MBEDTLS_SSL_DEBUG_MSG( 2, ( "certificate required" ) );
return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE );
}
/*
* Verify signature
*/