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Adapt ServerKeyEchange processing to restart

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This commit is contained in:
Manuel Pégourié-Gonnard 2017-05-18 11:27:06 +02:00
parent 862cde5b8e
commit 1f1f2a1ca6
3 changed files with 43 additions and 4 deletions
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2
include/mbedtls/ssl_internal.h
View file

@ -231,6 +231,8 @@ struct mbedtls_ssl_handshake_params
mbedtls_ecdsa_restart_ctx rs_ctx; /*!< ECDSA restart context */
enum {
ssl_ecrs_init = 0, /*!< just getting started */
ssl_ecrs_ske_read, /*!< ServerKeyExchange was read */
ssl_ecrs_ske_verified, /*!< ServerKeyExchange was verified */
ssl_ecrs_ecdh_public_done, /*!< wrote ECDHE public share */
ssl_ecrs_ecdh_completed, /*!< completed ECDHE key exchange */
ssl_ecrs_keys_derived, /*!< ssl_derive_keys() done */

40
library/ssl_cli.c
View file

@ -1697,6 +1697,14 @@ static int ssl_parse_server_hello( mbedtls_ssl_context *ssl )
MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, chosen ciphersuite: %s", suite_info->name ) );
#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
i = 0;
while( 1 )
{
@ -2303,12 +2311,22 @@ static int ssl_parse_server_key_exchange( mbedtls_ssl_context *ssl )
#endif /* MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED ||
MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED */
#if defined(MBEDTLS_SSL__ECP_RESTARTABLE)
if( ssl->handshake->ecrs_state == ssl_ecrs_ske_read )
goto ske_process;
#endif
if( ( ret = mbedtls_ssl_read_record( ssl ) ) != 0 )
{
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_read_record", ret );
return( ret );
}
#if defined(MBEDTLS_SSL__ECP_RESTARTABLE)
ssl->handshake->ecrs_state++;
ske_process:
#endif
if( ssl->in_msgtype != MBEDTLS_SSL_MSG_HANDSHAKE )
{
MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server key exchange message" ) );
@ -2432,6 +2450,7 @@ static int ssl_parse_server_key_exchange( mbedtls_ssl_context *ssl )
mbedtls_pk_type_t pk_alg = MBEDTLS_PK_NONE;
unsigned char *params = ssl->in_msg + mbedtls_ssl_hs_hdr_len( ssl );
size_t params_len = p - params;
void *rs_ctx = NULL;
/*
* Handle the digitally-signed structure
@ -2598,14 +2617,27 @@ static int ssl_parse_server_key_exchange( mbedtls_ssl_context *ssl )
return( MBEDTLS_ERR_SSL_PK_TYPE_MISMATCH );
}
if( ( ret = mbedtls_pk_verify( &ssl->session_negotiate->peer_cert->pk,
md_alg, hash, hashlen, p, sig_len ) ) != 0 )
#if defined(MBEDTLS_SSL__ECP_RESTARTABLE)
if( ssl->handshake->ec_restart_enabled )
rs_ctx = &ssl->handshake->rs_ctx;
#endif
if( ( ret = mbedtls_pk_verify_restartable(
&ssl->session_negotiate->peer_cert->pk,
md_alg, hash, hashlen, p, sig_len, rs_ctx ) ) != 0 )
{
mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
MBEDTLS_SSL_ALERT_MSG_DECRYPT_ERROR );
#if defined(MBEDTLS_SSL__ECP_RESTARTABLE)
if( ret != MBEDTLS_ERR_ECP_IN_PROGRESS )
#endif
mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
MBEDTLS_SSL_ALERT_MSG_DECRYPT_ERROR );
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_pk_verify", ret );
return( ret );
}
#if defined(MBEDTLS_SSL__ECP_RESTARTABLE)
ssl->handshake->ecrs_state++;
#endif
}
#endif /* MBEDTLS_KEY_EXCHANGE__WITH_SERVER_SIGNATURE__ENABLED */

5
tests/ssl-opt.sh
View file

@ -3450,6 +3450,7 @@ run_test "EC restart: TLS, default" \
key_file=data_files/server5.key crt_file=data_files/server5.crt \
debug_level=1" \
0 \
-C "mbedtls_pk_verify.*4b80" \
-C "mbedtls_ecdh_make_public.*4b80" \
-C "mbedtls_pk_sign.*4b80"
@ -3460,6 +3461,7 @@ run_test "EC restart: TLS, max_ops=0" \
key_file=data_files/server5.key crt_file=data_files/server5.crt \
debug_level=1 ec_max_ops=0" \
0 \
-C "mbedtls_pk_verify.*4b80" \
-C "mbedtls_ecdh_make_public.*4b80" \
-C "mbedtls_pk_sign.*4b80"
@ -3470,6 +3472,7 @@ run_test "EC restart: TLS, max_ops=65535" \
key_file=data_files/server5.key crt_file=data_files/server5.crt \
debug_level=1 ec_max_ops=65535" \
0 \
-C "mbedtls_pk_verify.*4b80" \
-C "mbedtls_ecdh_make_public.*4b80" \
-C "mbedtls_pk_sign.*4b80"
@ -3480,6 +3483,7 @@ run_test "EC restart: TLS, max_ops=1000" \
key_file=data_files/server5.key crt_file=data_files/server5.crt \
debug_level=1 ec_max_ops=1000" \
0 \
-c "mbedtls_pk_verify.*4b80" \
-c "mbedtls_ecdh_make_public.*4b80" \
-c "mbedtls_pk_sign.*4b80"
@ -3490,6 +3494,7 @@ run_test "EC restart: DTLS, max_ops=1000" \
key_file=data_files/server5.key crt_file=data_files/server5.crt \
dtls=1 debug_level=1 ec_max_ops=1000" \
0 \
-c "mbedtls_pk_verify.*4b80" \
-c "mbedtls_ecdh_make_public.*4b80" \
-c "mbedtls_pk_sign.*4b80"