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Implement RSA-PSK key exchange

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This commit is contained in:
Manuel Pégourié-Gonnard 2013-10-14 17:39:48 +02:00
parent 057e0cf263
commit 0fae60bb71
4 changed files with 152 additions and 63 deletions
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65
library/ssl_srv.c
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@ -2288,10 +2288,14 @@ static int ssl_parse_client_dh_public( ssl_context *ssl, unsigned char **p,
POLARSSL_KEY_EXCHANGE_DHE_PSK_ENABLED */
#if defined(POLARSSL_KEY_EXCHANGE_RSA_ENABLED)
static int ssl_parse_encrypted_pms_secret( ssl_context *ssl )
static int ssl_parse_encrypted_pms( ssl_context *ssl,
const unsigned char *p,
const unsigned char *end,
size_t pms_offset )
{
int ret = POLARSSL_ERR_SSL_FEATURE_UNAVAILABLE;
size_t i, n = 0;
int ret;
size_t len = pk_get_len( ssl_own_key( ssl ) );
unsigned char *pms = ssl->handshake->premaster + pms_offset;
if( ! pk_can_do( ssl_own_key( ssl ), POLARSSL_PK_RSA ) )
{
@ -2302,17 +2306,12 @@ static int ssl_parse_encrypted_pms_secret( ssl_context *ssl )
/*
* Decrypt the premaster using own private RSA key
*/
i = 4;
n = pk_get_len( ssl_own_key( ssl ) );
ssl->handshake->pmslen = 48;
#if defined(POLARSSL_SSL_PROTO_TLS1) || defined(POLARSSL_SSL_PROTO_TLS1_1) || \
defined(POLARSSL_SSL_PROTO_TLS1_2)
if( ssl->minor_ver != SSL_MINOR_VERSION_0 )
{
i += 2;
if( ssl->in_msg[4] != ( ( n >> 8 ) & 0xFF ) ||
ssl->in_msg[5] != ( ( n ) & 0xFF ) )
if( *p++ != ( ( len >> 8 ) & 0xFF ) ||
*p++ != ( ( len ) & 0xFF ) )
{
SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) );
return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE );
@ -2320,21 +2319,20 @@ static int ssl_parse_encrypted_pms_secret( ssl_context *ssl )
}
#endif
if( ssl->in_hslen != i + n )
if( p + len != end )
{
SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) );
return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE );
}
ret = pk_decrypt( ssl_own_key( ssl ),
ssl->in_msg + i, n,
ssl->handshake->premaster, &ssl->handshake->pmslen,
ret = pk_decrypt( ssl_own_key( ssl ), p, len,
pms, &ssl->handshake->pmslen,
sizeof(ssl->handshake->premaster),
ssl->f_rng, ssl->p_rng );
if( ret != 0 || ssl->handshake->pmslen != 48 ||
ssl->handshake->premaster[0] != ssl->handshake->max_major_ver ||
ssl->handshake->premaster[1] != ssl->handshake->max_minor_ver )
pms[0] != ssl->handshake->max_major_ver ||
pms[1] != ssl->handshake->max_minor_ver )
{
SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) );
@ -2346,8 +2344,7 @@ static int ssl_parse_encrypted_pms_secret( ssl_context *ssl )
*/
ssl->handshake->pmslen = 48;
ret = ssl->f_rng( ssl->p_rng, ssl->handshake->premaster,
ssl->handshake->pmslen );
ret = ssl->f_rng( ssl->p_rng, pms, ssl->handshake->pmslen );
if( ret != 0 )
return( ret );
}
@ -2541,6 +2538,33 @@ static int ssl_parse_client_key_exchange( ssl_context *ssl )
}
else
#endif /* POLARSSL_KEY_EXCHANGE_PSK_ENABLED */
#if defined(POLARSSL_KEY_EXCHANGE_RSA_PSK_ENABLED)
if( ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_RSA_PSK )
{
unsigned char *p = ssl->in_msg + 4;
unsigned char *end = ssl->in_msg + ssl->in_msglen;
if( ( ret = ssl_parse_client_psk_identity( ssl, &p, end ) ) != 0 )
{
SSL_DEBUG_RET( 1, ( "ssl_parse_client_psk_identity" ), ret );
return( ret );
}
if( ( ret = ssl_parse_encrypted_pms( ssl, p, end, 2 ) ) != 0 )
{
SSL_DEBUG_RET( 1, ( "ssl_parse_encrypted_pms" ), ret );
return( ret );
}
if( ( ret = ssl_psk_derive_premaster( ssl,
ciphersuite_info->key_exchange ) ) != 0 )
{
SSL_DEBUG_RET( 1, "ssl_psk_derive_premaster", ret );
return( ret );
}
}
else
#endif /* POLARSSL_KEY_EXCHANGE_RSA_PSK_ENABLED */
#if defined(POLARSSL_KEY_EXCHANGE_DHE_PSK_ENABLED)
if( ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_DHE_PSK )
{
@ -2600,7 +2624,10 @@ static int ssl_parse_client_key_exchange( ssl_context *ssl )
#if defined(POLARSSL_KEY_EXCHANGE_RSA_ENABLED)
if( ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_RSA )
{
if( ( ret = ssl_parse_encrypted_pms_secret( ssl ) ) != 0 )
if( ( ret = ssl_parse_encrypted_pms( ssl,
ssl->in_msg + 4,
ssl->in_msg + ssl->in_msglen,
0 ) ) != 0 )
{
SSL_DEBUG_RET( 1, ( "ssl_parse_parse_ecrypted_pms_secret" ), ret );
return( ret );