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ssl_write_server_key_exchange refactor: don't use p in the signing phase

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This is in preparation of further splitting ssl_write_server_key_exchange
into several functions.
This commit is contained in:
Gilles Peskine 2018-01-08 16:59:14 +01:00
parent 184a3faa8a
commit 1004c19ed0
1 changed files with 24 additions and 13 deletions
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37
library/ssl_srv.c
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@ -3006,6 +3006,8 @@ curve_matching_done:
} }
#endif /* MBEDTLS_KEY_EXCHANGE__SOME__ECDHE_ENABLED */ #endif /* MBEDTLS_KEY_EXCHANGE__SOME__ECDHE_ENABLED */
ssl->out_msglen = p - ssl->out_msg;
/* /*
* *
* Part 2: For key exchanges involving the server signing the * Part 2: For key exchanges involving the server signing the
@ -3015,7 +3017,7 @@ curve_matching_done:
#if defined(MBEDTLS_KEY_EXCHANGE__WITH_SERVER_SIGNATURE__ENABLED) #if defined(MBEDTLS_KEY_EXCHANGE__WITH_SERVER_SIGNATURE__ENABLED)
if( mbedtls_ssl_ciphersuite_uses_server_signature( ciphersuite_info ) ) if( mbedtls_ssl_ciphersuite_uses_server_signature( ciphersuite_info ) )
{ {
size_t dig_signed_len = p - dig_signed; size_t dig_signed_len = ssl->out_msg + ssl->out_msglen - dig_signed;
size_t signature_len = 0; size_t signature_len = 0;
unsigned int hashlen = 0; unsigned int hashlen = 0;
unsigned char hash[MBEDTLS_MD_MAX_SIZE]; unsigned char hash[MBEDTLS_MD_MAX_SIZE];
@ -3175,8 +3177,10 @@ curve_matching_done:
* *
*/ */
*(p++) = mbedtls_ssl_hash_from_md_alg( md_alg ); ssl->out_msg[ssl->out_msglen++] =
*(p++) = mbedtls_ssl_sig_from_pk_alg( sig_alg ); mbedtls_ssl_hash_from_md_alg( md_alg );
ssl->out_msg[ssl->out_msglen++] =
mbedtls_ssl_sig_from_pk_alg( sig_alg );
} }
#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
@ -3184,7 +3188,7 @@ curve_matching_done:
if( ssl->conf->f_async_sign_start != NULL ) if( ssl->conf->f_async_sign_start != NULL )
{ {
size_t sig_max_len = ( ssl->out_buf + MBEDTLS_SSL_MAX_CONTENT_LEN size_t sig_max_len = ( ssl->out_buf + MBEDTLS_SSL_MAX_CONTENT_LEN
- ( p + 2 ) ); - ( ssl->out_msg + ssl->out_msglen + 2 ) );
ret = ssl->conf->f_async_sign_start( ret = ssl->conf->f_async_sign_start(
ssl->conf->p_async_connection_ctx, ssl->conf->p_async_connection_ctx,
&ssl->handshake->p_async_operation_ctx, &ssl->handshake->p_async_operation_ctx,
@ -3200,7 +3204,8 @@ curve_matching_done:
ret = ssl->conf->f_async_resume( ret = ssl->conf->f_async_resume(
ssl->conf->p_async_connection_ctx, ssl->conf->p_async_connection_ctx,
ssl->handshake->p_async_operation_ctx, ssl->handshake->p_async_operation_ctx,
p + 2, &signature_len, sig_max_len ); ssl->out_msg + ssl->out_msglen + 2,
&signature_len, sig_max_len );
if( ret != MBEDTLS_ERR_SSL_ASYNC_IN_PROGRESS ) if( ret != MBEDTLS_ERR_SSL_ASYNC_IN_PROGRESS )
{ {
ssl->handshake->p_async_operation_ctx = NULL; ssl->handshake->p_async_operation_ctx = NULL;
@ -3213,7 +3218,7 @@ curve_matching_done:
} }
/* FALLTHROUGH */ /* FALLTHROUGH */
case MBEDTLS_ERR_SSL_ASYNC_IN_PROGRESS: case MBEDTLS_ERR_SSL_ASYNC_IN_PROGRESS:
ssl->handshake->out_async_start = p; ssl->handshake->out_async_start = ssl->out_msg + ssl->out_msglen;
MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write server key exchange (pending)" ) ); MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write server key exchange (pending)" ) );
return( MBEDTLS_ERR_SSL_ASYNC_IN_PROGRESS ); return( MBEDTLS_ERR_SSL_ASYNC_IN_PROGRESS );
default: default:
@ -3229,8 +3234,12 @@ curve_matching_done:
return( MBEDTLS_ERR_SSL_PRIVATE_KEY_REQUIRED ); return( MBEDTLS_ERR_SSL_PRIVATE_KEY_REQUIRED );
} }
if( ( ret = mbedtls_pk_sign( mbedtls_ssl_own_key( ssl ), md_alg, hash, hashlen, if( ( ret = mbedtls_pk_sign( mbedtls_ssl_own_key( ssl ),
p + 2 , &signature_len, ssl->conf->f_rng, ssl->conf->p_rng ) ) != 0 ) md_alg, hash, hashlen,
ssl->out_msg + ssl->out_msglen + 2,
&signature_len,
ssl->conf->f_rng,
ssl->conf->p_rng ) ) != 0 )
{ {
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_pk_sign", ret ); MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_pk_sign", ret );
return( ret ); return( ret );
@ -3239,22 +3248,24 @@ curve_matching_done:
#if defined(MBEDTLS_SSL_ASYNC_PRIVATE_C) #if defined(MBEDTLS_SSL_ASYNC_PRIVATE_C)
have_signature: have_signature:
#endif /* MBEDTLS_SSL_ASYNC_PRIVATE_C */ #endif /* MBEDTLS_SSL_ASYNC_PRIVATE_C */
*(p++) = (unsigned char)( signature_len >> 8 ); ssl->out_msg[ssl->out_msglen++] = (unsigned char)( signature_len >> 8 );
*(p++) = (unsigned char)( signature_len ); ssl->out_msg[ssl->out_msglen++] = (unsigned char)( signature_len );
MBEDTLS_SSL_DEBUG_BUF( 3, "my signature", p, signature_len ); MBEDTLS_SSL_DEBUG_BUF( 3, "my signature",
ssl->out_msg + ssl->out_msglen,
signature_len );
p += signature_len; ssl->out_msglen += signature_len;
} }
#endif /* MBEDTLS_KEY_EXCHANGE__WITH_SERVER_SIGNATURE__ENABLED */ #endif /* MBEDTLS_KEY_EXCHANGE__WITH_SERVER_SIGNATURE__ENABLED */
ssl->out_msglen = p - ssl->out_msg;
return( 0 ); return( 0 );
} }
static int ssl_write_server_key_exchange( mbedtls_ssl_context *ssl ) static int ssl_write_server_key_exchange( mbedtls_ssl_context *ssl )
{ {
int ret; int ret;
/* Extract static ECDH parameters and abort if ServerKeyExchange /* Extract static ECDH parameters and abort if ServerKeyExchange
* is not needed. */ * is not needed. */
#if defined(MBEDTLS_KEY_EXCHANGE__SOME_NON_PFS__ENABLED) #if defined(MBEDTLS_KEY_EXCHANGE__SOME_NON_PFS__ENABLED)