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Check key type against selected key exchange

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Manuel Pégourié-Gonnard 2013-08-19 13:50:33 +02:00
parent 20846b1a50
commit 09edda888e
3 changed files with 32 additions and 0 deletions
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3
include/polarssl/ssl_ciphersuites.h
View file

@ -27,6 +27,7 @@
#ifndef POLARSSL_SSL_CIPHERSUITES_H
#define POLARSSL_SSL_CIPHERSUITES_H
#include "pk.h"
#include "cipher.h"
#include "md.h"
@ -197,6 +198,8 @@ const int *ssl_ciphersuites_list( void );
const ssl_ciphersuite_t *ssl_ciphersuite_from_string( const char *ciphersuite_name );
const ssl_ciphersuite_t *ssl_ciphersuite_from_id( int ciphersuite_id );
pk_type_t ssl_get_ciphersuite_sig_pk_alg( const ssl_ciphersuite_t *info );
#ifdef __cplusplus
}
#endif

16
library/ssl_ciphersuites.c
View file

@ -916,4 +916,20 @@ int ssl_get_ciphersuite_id( const char *ciphersuite_name )
return( cur->id );
}
pk_type_t ssl_get_ciphersuite_sig_pk_alg( const ssl_ciphersuite_t *info )
{
switch( info->key_exchange )
{
case POLARSSL_KEY_EXCHANGE_DHE_RSA:
case POLARSSL_KEY_EXCHANGE_ECDHE_RSA:
return( POLARSSL_PK_RSA );
case POLARSSL_KEY_EXCHANGE_ECDHE_ECDSA:
return( POLARSSL_PK_ECDSA );
default:
return( POLARSSL_PK_NONE );
}
}
#endif

13
library/ssl_cli.c
View file

@ -1394,6 +1394,19 @@ static int ssl_parse_server_key_exchange( ssl_context *ssl )
return( POLARSSL_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
}
if( pk_alg != POLARSSL_PK_NONE )
{
if( pk_alg != ssl_get_ciphersuite_sig_pk_alg( ciphersuite_info ) )
{
SSL_DEBUG_MSG( 1, ( "bad server key exchange message" ) );
return( POLARSSL_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
}
}
else
{
pk_alg = ssl_get_ciphersuite_sig_pk_alg( ciphersuite_info );
}
sig_len = ( p[0] << 8 ) | p[1];
p += 2;