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Clean up existing SSL restartable ECC code

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- more consistent naming with ecrs prefix for everything
- always check it enabled before touching the rest
- rm duplicated code in parse_server_hello()
This commit is contained in:
Manuel Pégourié-Gonnard 2017-08-15 11:49:08 +02:00
parent 8b59049407
commit d27d1a5a82
3 changed files with 40 additions and 31 deletions
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4
include/mbedtls/ssl_internal.h
View file

@ -227,8 +227,8 @@ struct mbedtls_ssl_handshake_params
#endif /* MBEDTLS_SSL_SERVER_NAME_INDICATION */ #endif /* MBEDTLS_SSL_SERVER_NAME_INDICATION */
#endif /* MBEDTLS_X509_CRT_PARSE_C */ #endif /* MBEDTLS_X509_CRT_PARSE_C */
#if defined(MBEDTLS_SSL__ECP_RESTARTABLE) #if defined(MBEDTLS_SSL__ECP_RESTARTABLE)
int ec_restart_enabled; /*!< Handshake supports EC restart? */ int ecrs_enabled; /*!< Handshake supports EC restart? */
mbedtls_ecdsa_restart_ctx rs_ctx; /*!< ECDSA restart context */ mbedtls_ecdsa_restart_ctx ecrs_ctx; /*!< ECDSA restart context */
enum { enum {
ssl_ecrs_init = 0, /*!< just getting started */ ssl_ecrs_init = 0, /*!< just getting started */
ssl_ecrs_ske_read, /*!< ServerKeyExchange was read */ ssl_ecrs_ske_read, /*!< ServerKeyExchange was read */

63
library/ssl_cli.c
View file

@ -1701,7 +1701,7 @@ static int ssl_parse_server_hello( mbedtls_ssl_context *ssl )
if( suite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA && if( suite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA &&
ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 ) ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 )
{ {
ssl->handshake->ec_restart_enabled = 1; ssl->handshake->ecrs_enabled = 1;
} }
#endif #endif
@ -1723,14 +1723,6 @@ static int ssl_parse_server_hello( mbedtls_ssl_context *ssl )
} }
} }
#if defined(MBEDTLS_SSL__ECP_RESTARTABLE)
if( suite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA &&
ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 )
{
ssl->handshake->ec_restart_enabled = 1;
}
#endif
if( comp != MBEDTLS_SSL_COMPRESS_NULL if( comp != MBEDTLS_SSL_COMPRESS_NULL
#if defined(MBEDTLS_ZLIB_SUPPORT) #if defined(MBEDTLS_ZLIB_SUPPORT)
&& comp != MBEDTLS_SSL_COMPRESS_DEFLATE && comp != MBEDTLS_SSL_COMPRESS_DEFLATE
@ -2312,8 +2304,11 @@ static int ssl_parse_server_key_exchange( mbedtls_ssl_context *ssl )
MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED */ MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED */
#if defined(MBEDTLS_SSL__ECP_RESTARTABLE) #if defined(MBEDTLS_SSL__ECP_RESTARTABLE)
if( ssl->handshake->ecrs_state == ssl_ecrs_ske_read ) if( ssl->handshake->ecrs_enabled &&
goto ske_process; ssl->handshake->ecrs_state == ssl_ecrs_ske_read )
{
goto ske_process;
}
#endif #endif
if( ( ret = mbedtls_ssl_read_record( ssl ) ) != 0 ) if( ( ret = mbedtls_ssl_read_record( ssl ) ) != 0 )
@ -2323,6 +2318,7 @@ static int ssl_parse_server_key_exchange( mbedtls_ssl_context *ssl )
} }
#if defined(MBEDTLS_SSL__ECP_RESTARTABLE) #if defined(MBEDTLS_SSL__ECP_RESTARTABLE)
if( ssl->handshake->ecrs_enabled )
ssl->handshake->ecrs_state++; ssl->handshake->ecrs_state++;
ske_process: ske_process:
@ -2618,8 +2614,8 @@ ske_process:
} }
#if defined(MBEDTLS_SSL__ECP_RESTARTABLE) #if defined(MBEDTLS_SSL__ECP_RESTARTABLE)
if( ssl->handshake->ec_restart_enabled ) if( ssl->handshake->ecrs_enabled )
rs_ctx = &ssl->handshake->rs_ctx; rs_ctx = &ssl->handshake->ecrs_ctx;
#endif #endif
if( ( ret = mbedtls_pk_verify_restartable( if( ( ret = mbedtls_pk_verify_restartable(
@ -2636,7 +2632,8 @@ ske_process:
} }
#if defined(MBEDTLS_SSL__ECP_RESTARTABLE) #if defined(MBEDTLS_SSL__ECP_RESTARTABLE)
ssl->handshake->ecrs_state++; if( ssl->handshake->ecrs_enabled )
ssl->handshake->ecrs_state++;
#endif #endif
} }
#endif /* MBEDTLS_KEY_EXCHANGE__WITH_SERVER_SIGNATURE__ENABLED */ #endif /* MBEDTLS_KEY_EXCHANGE__WITH_SERVER_SIGNATURE__ENABLED */
@ -2902,11 +2899,13 @@ static int ssl_write_client_key_exchange( mbedtls_ssl_context *ssl )
i = 4; i = 4;
#if defined(MBEDTLS_SSL__ECP_RESTARTABLE) #if defined(MBEDTLS_SSL__ECP_RESTARTABLE)
if( ssl->handshake->ec_restart_enabled) if( ssl->handshake->ecrs_enabled )
mbedtls_ecdh_enable_restart( &ssl->handshake->ecdh_ctx ); {
if( ssl->handshake->ecrs_state == ssl_ecrs_ecdh_public_done )
goto ecdh_calc_secret;
if( ssl->handshake->ecrs_state == ssl_ecrs_ecdh_public_done ) mbedtls_ecdh_enable_restart( &ssl->handshake->ecdh_ctx );
goto ecdh_calc_secret; }
#endif #endif
ret = mbedtls_ecdh_make_public( &ssl->handshake->ecdh_ctx, ret = mbedtls_ecdh_make_public( &ssl->handshake->ecdh_ctx,
@ -2922,11 +2921,15 @@ static int ssl_write_client_key_exchange( mbedtls_ssl_context *ssl )
MBEDTLS_SSL_DEBUG_ECP( 3, "ECDH: Q", &ssl->handshake->ecdh_ctx.Q ); MBEDTLS_SSL_DEBUG_ECP( 3, "ECDH: Q", &ssl->handshake->ecdh_ctx.Q );
#if defined(MBEDTLS_SSL__ECP_RESTARTABLE) #if defined(MBEDTLS_SSL__ECP_RESTARTABLE)
ssl->handshake->ecrs_n = n; if( ssl->handshake->ecrs_enabled )
ssl->handshake->ecrs_state++; {
ssl->handshake->ecrs_n = n;
ssl->handshake->ecrs_state++;
}
ecdh_calc_secret: ecdh_calc_secret:
n = ssl->handshake->ecrs_n; if( ssl->handshake->ecrs_enabled )
n = ssl->handshake->ecrs_n;
#endif #endif
if( ( ret = mbedtls_ecdh_calc_secret( &ssl->handshake->ecdh_ctx, if( ( ret = mbedtls_ecdh_calc_secret( &ssl->handshake->ecdh_ctx,
&ssl->handshake->pmslen, &ssl->handshake->pmslen,
@ -2941,7 +2944,8 @@ ecdh_calc_secret:
MBEDTLS_SSL_DEBUG_MPI( 3, "ECDH: z", &ssl->handshake->ecdh_ctx.z ); MBEDTLS_SSL_DEBUG_MPI( 3, "ECDH: z", &ssl->handshake->ecdh_ctx.z );
#if defined(MBEDTLS_SSL__ECP_RESTARTABLE) #if defined(MBEDTLS_SSL__ECP_RESTARTABLE)
ssl->handshake->ecrs_state++; if( ssl->handshake->ecrs_enabled )
ssl->handshake->ecrs_state++;
#endif #endif
} }
else else
@ -3162,8 +3166,11 @@ static int ssl_write_certificate_verify( mbedtls_ssl_context *ssl )
MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write certificate verify" ) ); MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write certificate verify" ) );
#if defined(MBEDTLS_SSL__ECP_RESTARTABLE) #if defined(MBEDTLS_SSL__ECP_RESTARTABLE)
if( ssl->handshake->ecrs_state == ssl_ecrs_keys_derived ) if( ssl->handshake->ecrs_enabled &&
ssl->handshake->ecrs_state == ssl_ecrs_keys_derived )
{
goto keys_derived; goto keys_derived;
}
#endif #endif
if( ( ret = mbedtls_ssl_derive_keys( ssl ) ) != 0 ) if( ( ret = mbedtls_ssl_derive_keys( ssl ) ) != 0 )
@ -3173,7 +3180,8 @@ static int ssl_write_certificate_verify( mbedtls_ssl_context *ssl )
} }
#if defined(MBEDTLS_SSL__ECP_RESTARTABLE) #if defined(MBEDTLS_SSL__ECP_RESTARTABLE)
ssl->handshake->ecrs_state++; if( ssl->handshake->ecrs_enabled )
ssl->handshake->ecrs_state++;
keys_derived: keys_derived:
#endif #endif
@ -3281,8 +3289,8 @@ keys_derived:
} }
#if defined(MBEDTLS_SSL__ECP_RESTARTABLE) #if defined(MBEDTLS_SSL__ECP_RESTARTABLE)
if( ssl->handshake->ec_restart_enabled ) if( ssl->handshake->ecrs_enabled )
rs_ctx = &ssl->handshake->rs_ctx; rs_ctx = &ssl->handshake->ecrs_ctx;
#endif #endif
if( ( ret = mbedtls_pk_sign_restartable( mbedtls_ssl_own_key( ssl ), if( ( ret = mbedtls_pk_sign_restartable( mbedtls_ssl_own_key( ssl ),
@ -3295,7 +3303,8 @@ keys_derived:
} }
#if defined(MBEDTLS_SSL__ECP_RESTARTABLE) #if defined(MBEDTLS_SSL__ECP_RESTARTABLE)
ssl->handshake->ecrs_state++; if( ssl->handshake->ecrs_enabled )
ssl->handshake->ecrs_state++;
#endif #endif
ssl->out_msg[4 + offset] = (unsigned char)( n >> 8 ); ssl->out_msg[4 + offset] = (unsigned char)( n >> 8 );

4
library/ssl_tls.c
View file

@ -5473,7 +5473,7 @@ static void ssl_handshake_params_init( mbedtls_ssl_handshake_params *handshake )
#endif #endif
#if defined(MBEDTLS_SSL__ECP_RESTARTABLE) #if defined(MBEDTLS_SSL__ECP_RESTARTABLE)
mbedtls_ecdsa_restart_init( &handshake->rs_ctx ); mbedtls_ecdsa_restart_init( &handshake->ecrs_ctx );
#endif #endif
#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION) #if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
@ -7309,7 +7309,7 @@ void mbedtls_ssl_handshake_free( mbedtls_ssl_handshake_params *handshake )
#endif /* MBEDTLS_X509_CRT_PARSE_C && MBEDTLS_SSL_SERVER_NAME_INDICATION */ #endif /* MBEDTLS_X509_CRT_PARSE_C && MBEDTLS_SSL_SERVER_NAME_INDICATION */
#if defined(MBEDTLS_SSL__ECP_RESTARTABLE) #if defined(MBEDTLS_SSL__ECP_RESTARTABLE)
mbedtls_ecdsa_restart_free( &handshake->rs_ctx ); mbedtls_ecdsa_restart_free( &handshake->ecrs_ctx );
#endif #endif
#if defined(MBEDTLS_SSL_PROTO_DTLS) #if defined(MBEDTLS_SSL_PROTO_DTLS)