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Add debug info for cert/suite selection

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Manuel Pégourié-Gonnard 2015-01-26 11:17:20 +00:00 committed by Paul Bakker
parent ceedb8292e
commit 607d663b41
4 changed files with 51 additions and 8 deletions
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2
ChangeLog
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@ -35,6 +35,8 @@ Features
a compatible enough libc (eg uClibc).
* Add ssl_set_arc4_support() to make it easier to disable RC4 at runtime
while using the default ciphersuite list.
* Added new error codes and debug messages about selection of
ciphersuite/certificate.
Bugfix
* Stack buffer overflow if ctr_drbg_update() is called with too large

2
include/polarssl/ssl.h
View file

@ -149,7 +149,7 @@
#define POLARSSL_ERR_SSL_INTERNAL_ERROR -0x6C00 /**< Internal error (eg, unexpected failure in lower-level module) */
#define POLARSSL_ERR_SSL_COUNTER_WRAPPING -0x6B80 /**< A counter would wrap (eg, too many messages exchanged). */
#define POLARSSL_ERR_SSL_WAITING_SERVER_HELLO_RENEGO -0x6B00 /**< Unexpected message at ServerHello in renegotiation. */
#define POLARSSL_ERR_SSL_NO_USABLE_CIPHERSUITE -0x6A80 /**< None of the common ciphersuites is usable (eg, no suitable certificate) */
#define POLARSSL_ERR_SSL_NO_USABLE_CIPHERSUITE -0x6A80 /**< None of the common ciphersuites is usable (eg, no suitable certificate, see debug messages). */
/*
* Various constants

2
library/error.c
View file

@ -450,7 +450,7 @@ void polarssl_strerror( int ret, char *buf, size_t buflen )
if( use_ret == -(POLARSSL_ERR_SSL_WAITING_SERVER_HELLO_RENEGO) )
snprintf( buf, buflen, "SSL - Unexpected message at ServerHello in renegotiation" );
if( use_ret == -(POLARSSL_ERR_SSL_NO_USABLE_CIPHERSUITE) )
snprintf( buf, buflen, "SSL - None of the common ciphersuites is usable (eg, no suitable certificate)" );
snprintf( buf, buflen, "SSL - None of the common ciphersuites is usable (eg, no suitable certificate, see debug messages)" );
#endif /* POLARSSL_SSL_TLS_C */
#if defined(POLARSSL_X509_USE_C) || defined(POLARSSL_X509_CREATE_C)

53
library/ssl_srv.c
View file

@ -839,10 +839,18 @@ static int ssl_pick_cert( ssl_context *ssl,
if( pk_alg == POLARSSL_PK_NONE )
return( 0 );
SSL_DEBUG_MSG( 3, ( "ciphersuite requires certificate" ) );
for( cur = list; cur != NULL; cur = cur->next )
{
SSL_DEBUG_CRT( 3, "candidate certificate chain, certificate",
cur->cert );
if( ! pk_can_do( cur->key, pk_alg ) )
{
SSL_DEBUG_MSG( 3, ( "certificate mismatch: key type" ) );
continue;
}
/*
* This avoids sending the client a cert it'll reject based on
@ -855,13 +863,18 @@ static int ssl_pick_cert( ssl_context *ssl,
if( ssl_check_cert_usage( cur->cert, ciphersuite_info,
SSL_IS_SERVER ) != 0 )
{
SSL_DEBUG_MSG( 3, ( "certificate mismatch: "
"(extended) key usage extension" ) );
continue;
}
#if defined(POLARSSL_ECDSA_C)
if( pk_alg == POLARSSL_PK_ECDSA &&
ssl_check_key_curve( cur->key, ssl->handshake->curves ) != 0 )
{
SSL_DEBUG_MSG( 3, ( "certificate mismatch: elliptic curve" ) );
continue;
}
#endif
/*
@ -874,22 +887,27 @@ static int ssl_pick_cert( ssl_context *ssl,
{
if( fallback == NULL )
fallback = cur;
{
SSL_DEBUG_MSG( 3, ( "certificate not preferred: "
"sha-2 with pre-TLS 1.2 client" ) );
continue;
}
}
/* If we get there, we got a winner */
break;
}
if( cur == NULL )
cur = fallback;
/* Do not update ssl->handshake->key_cert unless the is a match */
if( cur != NULL )
{
ssl->handshake->key_cert = cur;
return( 0 );
}
if( fallback != NULL )
{
ssl->handshake->key_cert = fallback;
SSL_DEBUG_CRT( 3, "selected certificate chain, certificate",
ssl->handshake->key_cert->cert );
return( 0 );
}
@ -913,19 +931,31 @@ static int ssl_ciphersuite_match( ssl_context *ssl, int suite_id,
return( POLARSSL_ERR_SSL_INTERNAL_ERROR );
}
SSL_DEBUG_MSG( 3, ( "trying ciphersuite: %s", suite_info->name ) );
if( suite_info->min_minor_ver > ssl->minor_ver ||
suite_info->max_minor_ver < ssl->minor_ver )
{
SSL_DEBUG_MSG( 3, ( "ciphersuite mismatch: version" ) );
return( 0 );
}
if( ssl->arc4_disabled == SSL_ARC4_DISABLED &&
suite_info->cipher == POLARSSL_CIPHER_ARC4_128 )
{
SSL_DEBUG_MSG( 3, ( "ciphersuite mismatch: rc4" ) );
return( 0 );
}
#if defined(POLARSSL_ECDH_C) || defined(POLARSSL_ECDSA_C)
if( ssl_ciphersuite_uses_ec( suite_info ) &&
( ssl->handshake->curves == NULL ||
ssl->handshake->curves[0] == NULL ) )
{
SSL_DEBUG_MSG( 3, ( "ciphersuite mismatch: "
"no common elliptic curve" ) );
return( 0 );
}
#endif
#if defined(POLARSSL_KEY_EXCHANGE__SOME__PSK_ENABLED)
@ -935,7 +965,10 @@ static int ssl_ciphersuite_match( ssl_context *ssl, int suite_id,
ssl->f_psk == NULL &&
( ssl->psk == NULL || ssl->psk_identity == NULL ||
ssl->psk_identity_len == 0 || ssl->psk_len == 0 ) )
{
SSL_DEBUG_MSG( 3, ( "ciphersuite mismatch: no pre-shared key" ) );
return( 0 );
}
#endif
#if defined(POLARSSL_X509_CRT_PARSE_C)
@ -947,7 +980,11 @@ static int ssl_ciphersuite_match( ssl_context *ssl, int suite_id,
* This must be done last since we modify the key_cert list.
*/
if( ssl_pick_cert( ssl, suite_info ) != 0 )
{
SSL_DEBUG_MSG( 3, ( "ciphersuite mismatch: "
"no suitable certificate" ) );
return( 0 );
}
#endif
*ciphersuite_info = suite_info;
@ -1197,6 +1234,8 @@ static int ssl_parse_client_hello_v2( ssl_context *ssl )
}
have_ciphersuite_v2:
SSL_DEBUG_MSG( 2, ( "selected ciphersuite: %s", ciphersuite_info->name ) );
ssl->session_negotiate->ciphersuite = ciphersuites[i];
ssl->transform_negotiate->ciphersuite_info = ciphersuite_info;
ssl_optimize_checksum( ssl, ssl->transform_negotiate->ciphersuite_info );
@ -1755,6 +1794,8 @@ static int ssl_parse_client_hello( ssl_context *ssl )
}
have_ciphersuite:
SSL_DEBUG_MSG( 2, ( "selected ciphersuite: %s", ciphersuite_info->name ) );
ssl->session_negotiate->ciphersuite = ciphersuites[i];
ssl->transform_negotiate->ciphersuite_info = ciphersuite_info;
ssl_optimize_checksum( ssl, ssl->transform_negotiate->ciphersuite_info );