diff options
Diffstat (limited to 'lib/mbedtls-2.27.0/library/ssl_srv.c')
| -rw-r--r-- | lib/mbedtls-2.27.0/library/ssl_srv.c | 4808 |
1 files changed, 0 insertions, 4808 deletions
diff --git a/lib/mbedtls-2.27.0/library/ssl_srv.c b/lib/mbedtls-2.27.0/library/ssl_srv.c deleted file mode 100644 index aca871e..0000000 --- a/lib/mbedtls-2.27.0/library/ssl_srv.c +++ /dev/null @@ -1,4808 +0,0 @@ -/* - * SSLv3/TLSv1 server-side functions - * - * Copyright The Mbed TLS Contributors - * SPDX-License-Identifier: Apache-2.0 - * - * Licensed under the Apache License, Version 2.0 (the "License"); you may - * not use this file except in compliance with the License. - * You may obtain a copy of the License at - * - * http://www.apache.org/licenses/LICENSE-2.0 - * - * Unless required by applicable law or agreed to in writing, software - * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT - * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. - * See the License for the specific language governing permissions and - * limitations under the License. - */ - -#include "common.h" - -#if defined(MBEDTLS_SSL_SRV_C) - -#if defined(MBEDTLS_PLATFORM_C) -#include "mbedtls/platform.h" -#else -#include <stdlib.h> -#define mbedtls_calloc calloc -#define mbedtls_free free -#endif - -#include "mbedtls/ssl.h" -#include "mbedtls/ssl_internal.h" -#include "mbedtls/debug.h" -#include "mbedtls/error.h" -#include "mbedtls/platform_util.h" - -#include <string.h> - -#if defined(MBEDTLS_ECP_C) -#include "mbedtls/ecp.h" -#endif - -#if defined(MBEDTLS_HAVE_TIME) -#include "mbedtls/platform_time.h" -#endif - -#if defined(MBEDTLS_SSL_DTLS_HELLO_VERIFY) -int mbedtls_ssl_set_client_transport_id( mbedtls_ssl_context *ssl, - const unsigned char *info, - size_t ilen ) -{ - if( ssl->conf->endpoint != MBEDTLS_SSL_IS_SERVER ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - mbedtls_free( ssl->cli_id ); - - if( ( ssl->cli_id = mbedtls_calloc( 1, ilen ) ) == NULL ) - return( MBEDTLS_ERR_SSL_ALLOC_FAILED ); - - memcpy( ssl->cli_id, info, ilen ); - ssl->cli_id_len = ilen; - - return( 0 ); -} - -void mbedtls_ssl_conf_dtls_cookies( mbedtls_ssl_config *conf, - mbedtls_ssl_cookie_write_t *f_cookie_write, - mbedtls_ssl_cookie_check_t *f_cookie_check, - void *p_cookie ) -{ - conf->f_cookie_write = f_cookie_write; - conf->f_cookie_check = f_cookie_check; - conf->p_cookie = p_cookie; -} -#endif /* MBEDTLS_SSL_DTLS_HELLO_VERIFY */ - -#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION) -static int ssl_parse_servername_ext( mbedtls_ssl_context *ssl, - const unsigned char *buf, - size_t len ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - size_t servername_list_size, hostname_len; - const unsigned char *p; - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "parse ServerName extension" ) ); - - if( len < 2 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - servername_list_size = ( ( buf[0] << 8 ) | ( buf[1] ) ); - if( servername_list_size + 2 != len ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - - p = buf + 2; - while( servername_list_size > 2 ) - { - hostname_len = ( ( p[1] << 8 ) | p[2] ); - if( hostname_len + 3 > servername_list_size ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - - if( p[0] == MBEDTLS_TLS_EXT_SERVERNAME_HOSTNAME ) - { - ret = ssl->conf->f_sni( ssl->conf->p_sni, - ssl, p + 3, hostname_len ); - if( ret != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "ssl_sni_wrapper", ret ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_UNRECOGNIZED_NAME ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - return( 0 ); - } - - servername_list_size -= hostname_len + 3; - p += hostname_len + 3; - } - - if( servername_list_size != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - - return( 0 ); -} -#endif /* MBEDTLS_SSL_SERVER_NAME_INDICATION */ - -#if defined(MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED) -static int ssl_conf_has_psk_or_cb( mbedtls_ssl_config const *conf ) -{ - if( conf->f_psk != NULL ) - return( 1 ); - - if( conf->psk_identity_len == 0 || conf->psk_identity == NULL ) - return( 0 ); - - if( conf->psk != NULL && conf->psk_len != 0 ) - return( 1 ); - -#if defined(MBEDTLS_USE_PSA_CRYPTO) - if( ! mbedtls_svc_key_id_is_null( conf->psk_opaque ) ) - return( 1 ); -#endif /* MBEDTLS_USE_PSA_CRYPTO */ - - return( 0 ); -} - -#if defined(MBEDTLS_USE_PSA_CRYPTO) -static int ssl_use_opaque_psk( mbedtls_ssl_context const *ssl ) -{ - if( ssl->conf->f_psk != NULL ) - { - /* If we've used a callback to select the PSK, - * the static configuration is irrelevant. */ - - if( ! mbedtls_svc_key_id_is_null( ssl->handshake->psk_opaque ) ) - return( 1 ); - - return( 0 ); - } - - if( ! mbedtls_svc_key_id_is_null( ssl->conf->psk_opaque ) ) - return( 1 ); - - return( 0 ); -} -#endif /* MBEDTLS_USE_PSA_CRYPTO */ -#endif /* MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED */ - -static int ssl_parse_renegotiation_info( mbedtls_ssl_context *ssl, - const unsigned char *buf, - size_t len ) -{ -#if defined(MBEDTLS_SSL_RENEGOTIATION) - if( ssl->renego_status != MBEDTLS_SSL_INITIAL_HANDSHAKE ) - { - /* Check verify-data in constant-time. The length OTOH is no secret */ - if( len != 1 + ssl->verify_data_len || - buf[0] != ssl->verify_data_len || - mbedtls_ssl_safer_memcmp( buf + 1, ssl->peer_verify_data, - ssl->verify_data_len ) != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "non-matching renegotiation info" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - } - else -#endif /* MBEDTLS_SSL_RENEGOTIATION */ - { - if( len != 1 || buf[0] != 0x0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "non-zero length renegotiation info" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - - ssl->secure_renegotiation = MBEDTLS_SSL_SECURE_RENEGOTIATION; - } - - return( 0 ); -} - -#if defined(MBEDTLS_SSL_PROTO_TLS1_2) && \ - defined(MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED) - -/* - * Status of the implementation of signature-algorithms extension: - * - * Currently, we are only considering the signature-algorithm extension - * to pick a ciphersuite which allows us to send the ServerKeyExchange - * message with a signature-hash combination that the user allows. - * - * We do *not* check whether all certificates in our certificate - * chain are signed with an allowed signature-hash pair. - * This needs to be done at a later stage. - * - */ -static int ssl_parse_signature_algorithms_ext( mbedtls_ssl_context *ssl, - const unsigned char *buf, - size_t len ) -{ - size_t sig_alg_list_size; - - const unsigned char *p; - const unsigned char *end = buf + len; - - mbedtls_md_type_t md_cur; - mbedtls_pk_type_t sig_cur; - - if ( len < 2 ) { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - sig_alg_list_size = ( ( buf[0] << 8 ) | ( buf[1] ) ); - if( sig_alg_list_size + 2 != len || - sig_alg_list_size % 2 != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - - /* Currently we only guarantee signing the ServerKeyExchange message according - * to the constraints specified in this extension (see above), so it suffices - * to remember only one suitable hash for each possible signature algorithm. - * - * This will change when we also consider certificate signatures, - * in which case we will need to remember the whole signature-hash - * pair list from the extension. - */ - - for( p = buf + 2; p < end; p += 2 ) - { - /* Silently ignore unknown signature or hash algorithms. */ - - if( ( sig_cur = mbedtls_ssl_pk_alg_from_sig( p[1] ) ) == MBEDTLS_PK_NONE ) - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello v3, signature_algorithm ext" - " unknown sig alg encoding %d", p[1] ) ); - continue; - } - - /* Check if we support the hash the user proposes */ - md_cur = mbedtls_ssl_md_alg_from_hash( p[0] ); - if( md_cur == MBEDTLS_MD_NONE ) - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello v3, signature_algorithm ext:" - " unknown hash alg encoding %d", p[0] ) ); - continue; - } - - if( mbedtls_ssl_check_sig_hash( ssl, md_cur ) == 0 ) - { - mbedtls_ssl_sig_hash_set_add( &ssl->handshake->hash_algs, sig_cur, md_cur ); - MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello v3, signature_algorithm ext:" - " match sig %u and hash %u", - (unsigned) sig_cur, (unsigned) md_cur ) ); - } - else - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello v3, signature_algorithm ext: " - "hash alg %u not supported", (unsigned) md_cur ) ); - } - } - - return( 0 ); -} -#endif /* MBEDTLS_SSL_PROTO_TLS1_2 && - MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED */ - -#if defined(MBEDTLS_ECDH_C) || defined(MBEDTLS_ECDSA_C) || \ - defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED) -static int ssl_parse_supported_elliptic_curves( mbedtls_ssl_context *ssl, - const unsigned char *buf, - size_t len ) -{ - size_t list_size, our_size; - const unsigned char *p; - const mbedtls_ecp_curve_info *curve_info, **curves; - - if ( len < 2 ) { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - list_size = ( ( buf[0] << 8 ) | ( buf[1] ) ); - if( list_size + 2 != len || - list_size % 2 != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - - /* Should never happen unless client duplicates the extension */ - if( ssl->handshake->curves != NULL ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - - /* Don't allow our peer to make us allocate too much memory, - * and leave room for a final 0 */ - our_size = list_size / 2 + 1; - if( our_size > MBEDTLS_ECP_DP_MAX ) - our_size = MBEDTLS_ECP_DP_MAX; - - if( ( curves = mbedtls_calloc( our_size, sizeof( *curves ) ) ) == NULL ) - { - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_INTERNAL_ERROR ); - return( MBEDTLS_ERR_SSL_ALLOC_FAILED ); - } - - ssl->handshake->curves = curves; - - p = buf + 2; - while( list_size > 0 && our_size > 1 ) - { - curve_info = mbedtls_ecp_curve_info_from_tls_id( ( p[0] << 8 ) | p[1] ); - - if( curve_info != NULL ) - { - *curves++ = curve_info; - our_size--; - } - - list_size -= 2; - p += 2; - } - - return( 0 ); -} - -static int ssl_parse_supported_point_formats( mbedtls_ssl_context *ssl, - const unsigned char *buf, - size_t len ) -{ - size_t list_size; - const unsigned char *p; - - if( len == 0 || (size_t)( buf[0] + 1 ) != len ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - list_size = buf[0]; - - p = buf + 1; - while( list_size > 0 ) - { - if( p[0] == MBEDTLS_ECP_PF_UNCOMPRESSED || - p[0] == MBEDTLS_ECP_PF_COMPRESSED ) - { -#if defined(MBEDTLS_ECDH_C) || defined(MBEDTLS_ECDSA_C) - ssl->handshake->ecdh_ctx.point_format = p[0]; -#endif -#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED) - ssl->handshake->ecjpake_ctx.point_format = p[0]; -#endif - MBEDTLS_SSL_DEBUG_MSG( 4, ( "point format selected: %d", p[0] ) ); - return( 0 ); - } - - list_size--; - p++; - } - - return( 0 ); -} -#endif /* MBEDTLS_ECDH_C || MBEDTLS_ECDSA_C || - MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */ - -#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED) -static int ssl_parse_ecjpake_kkpp( mbedtls_ssl_context *ssl, - const unsigned char *buf, - size_t len ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - - if( mbedtls_ecjpake_check( &ssl->handshake->ecjpake_ctx ) != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "skip ecjpake kkpp extension" ) ); - return( 0 ); - } - - if( ( ret = mbedtls_ecjpake_read_round_one( &ssl->handshake->ecjpake_ctx, - buf, len ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecjpake_read_round_one", ret ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER ); - return( ret ); - } - - /* Only mark the extension as OK when we're sure it is */ - ssl->handshake->cli_exts |= MBEDTLS_TLS_EXT_ECJPAKE_KKPP_OK; - - return( 0 ); -} -#endif /* MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */ - -#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH) -static int ssl_parse_max_fragment_length_ext( mbedtls_ssl_context *ssl, - const unsigned char *buf, - size_t len ) -{ - if( len != 1 || buf[0] >= MBEDTLS_SSL_MAX_FRAG_LEN_INVALID ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - - ssl->session_negotiate->mfl_code = buf[0]; - - return( 0 ); -} -#endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */ - -#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID) -static int ssl_parse_cid_ext( mbedtls_ssl_context *ssl, - const unsigned char *buf, - size_t len ) -{ - size_t peer_cid_len; - - /* CID extension only makes sense in DTLS */ - if( ssl->conf->transport != MBEDTLS_SSL_TRANSPORT_DATAGRAM ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - - /* - * Quoting draft-ietf-tls-dtls-connection-id-05 - * https://tools.ietf.org/html/draft-ietf-tls-dtls-connection-id-05 - * - * struct { - * opaque cid<0..2^8-1>; - * } ConnectionId; - */ - - if( len < 1 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - - peer_cid_len = *buf++; - len--; - - if( len != peer_cid_len ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - - /* Ignore CID if the user has disabled its use. */ - if( ssl->negotiate_cid == MBEDTLS_SSL_CID_DISABLED ) - { - /* Leave ssl->handshake->cid_in_use in its default - * value of MBEDTLS_SSL_CID_DISABLED. */ - MBEDTLS_SSL_DEBUG_MSG( 3, ( "Client sent CID extension, but CID disabled" ) ); - return( 0 ); - } - - if( peer_cid_len > MBEDTLS_SSL_CID_OUT_LEN_MAX ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - - ssl->handshake->cid_in_use = MBEDTLS_SSL_CID_ENABLED; - ssl->handshake->peer_cid_len = (uint8_t) peer_cid_len; - memcpy( ssl->handshake->peer_cid, buf, peer_cid_len ); - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "Use of CID extension negotiated" ) ); - MBEDTLS_SSL_DEBUG_BUF( 3, "Client CID", buf, peer_cid_len ); - - return( 0 ); -} -#endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */ - -#if defined(MBEDTLS_SSL_TRUNCATED_HMAC) -static int ssl_parse_truncated_hmac_ext( mbedtls_ssl_context *ssl, - const unsigned char *buf, - size_t len ) -{ - if( len != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - - ((void) buf); - - if( ssl->conf->trunc_hmac == MBEDTLS_SSL_TRUNC_HMAC_ENABLED ) - ssl->session_negotiate->trunc_hmac = MBEDTLS_SSL_TRUNC_HMAC_ENABLED; - - return( 0 ); -} -#endif /* MBEDTLS_SSL_TRUNCATED_HMAC */ - -#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC) -static int ssl_parse_encrypt_then_mac_ext( mbedtls_ssl_context *ssl, - const unsigned char *buf, - size_t len ) -{ - if( len != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - - ((void) buf); - - if( ssl->conf->encrypt_then_mac == MBEDTLS_SSL_ETM_ENABLED && - ssl->minor_ver != MBEDTLS_SSL_MINOR_VERSION_0 ) - { - ssl->session_negotiate->encrypt_then_mac = MBEDTLS_SSL_ETM_ENABLED; - } - - return( 0 ); -} -#endif /* MBEDTLS_SSL_ENCRYPT_THEN_MAC */ - -#if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET) -static int ssl_parse_extended_ms_ext( mbedtls_ssl_context *ssl, - const unsigned char *buf, - size_t len ) -{ - if( len != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - - ((void) buf); - - if( ssl->conf->extended_ms == MBEDTLS_SSL_EXTENDED_MS_ENABLED && - ssl->minor_ver != MBEDTLS_SSL_MINOR_VERSION_0 ) - { - ssl->handshake->extended_ms = MBEDTLS_SSL_EXTENDED_MS_ENABLED; - } - - return( 0 ); -} -#endif /* MBEDTLS_SSL_EXTENDED_MASTER_SECRET */ - -#if defined(MBEDTLS_SSL_SESSION_TICKETS) -static int ssl_parse_session_ticket_ext( mbedtls_ssl_context *ssl, - unsigned char *buf, - size_t len ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - mbedtls_ssl_session session; - - mbedtls_ssl_session_init( &session ); - - if( ssl->conf->f_ticket_parse == NULL || - ssl->conf->f_ticket_write == NULL ) - { - return( 0 ); - } - - /* Remember the client asked us to send a new ticket */ - ssl->handshake->new_session_ticket = 1; - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "ticket length: %" MBEDTLS_PRINTF_SIZET, len ) ); - - if( len == 0 ) - return( 0 ); - -#if defined(MBEDTLS_SSL_RENEGOTIATION) - if( ssl->renego_status != MBEDTLS_SSL_INITIAL_HANDSHAKE ) - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "ticket rejected: renegotiating" ) ); - return( 0 ); - } -#endif /* MBEDTLS_SSL_RENEGOTIATION */ - - /* - * Failures are ok: just ignore the ticket and proceed. - */ - if( ( ret = ssl->conf->f_ticket_parse( ssl->conf->p_ticket, &session, - buf, len ) ) != 0 ) - { - mbedtls_ssl_session_free( &session ); - - if( ret == MBEDTLS_ERR_SSL_INVALID_MAC ) - MBEDTLS_SSL_DEBUG_MSG( 3, ( "ticket is not authentic" ) ); - else if( ret == MBEDTLS_ERR_SSL_SESSION_TICKET_EXPIRED ) - MBEDTLS_SSL_DEBUG_MSG( 3, ( "ticket is expired" ) ); - else - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_ticket_parse", ret ); - - return( 0 ); - } - - /* - * Keep the session ID sent by the client, since we MUST send it back to - * inform them we're accepting the ticket (RFC 5077 section 3.4) - */ - session.id_len = ssl->session_negotiate->id_len; - memcpy( &session.id, ssl->session_negotiate->id, session.id_len ); - - mbedtls_ssl_session_free( ssl->session_negotiate ); - memcpy( ssl->session_negotiate, &session, sizeof( mbedtls_ssl_session ) ); - - /* Zeroize instead of free as we copied the content */ - mbedtls_platform_zeroize( &session, sizeof( mbedtls_ssl_session ) ); - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "session successfully restored from ticket" ) ); - - ssl->handshake->resume = 1; - - /* Don't send a new ticket after all, this one is OK */ - ssl->handshake->new_session_ticket = 0; - - return( 0 ); -} -#endif /* MBEDTLS_SSL_SESSION_TICKETS */ - -#if defined(MBEDTLS_SSL_ALPN) -static int ssl_parse_alpn_ext( mbedtls_ssl_context *ssl, - const unsigned char *buf, size_t len ) -{ - size_t list_len, cur_len, ours_len; - const unsigned char *theirs, *start, *end; - const char **ours; - - /* If ALPN not configured, just ignore the extension */ - if( ssl->conf->alpn_list == NULL ) - return( 0 ); - - /* - * opaque ProtocolName<1..2^8-1>; - * - * struct { - * ProtocolName protocol_name_list<2..2^16-1> - * } ProtocolNameList; - */ - - /* Min length is 2 (list_len) + 1 (name_len) + 1 (name) */ - if( len < 4 ) - { - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - - list_len = ( buf[0] << 8 ) | buf[1]; - if( list_len != len - 2 ) - { - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - - /* - * Validate peer's list (lengths) - */ - start = buf + 2; - end = buf + len; - for( theirs = start; theirs != end; theirs += cur_len ) - { - cur_len = *theirs++; - - /* Current identifier must fit in list */ - if( cur_len > (size_t)( end - theirs ) ) - { - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - - /* Empty strings MUST NOT be included */ - if( cur_len == 0 ) - { - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - } - - /* - * Use our order of preference - */ - for( ours = ssl->conf->alpn_list; *ours != NULL; ours++ ) - { - ours_len = strlen( *ours ); - for( theirs = start; theirs != end; theirs += cur_len ) - { - cur_len = *theirs++; - - if( cur_len == ours_len && - memcmp( theirs, *ours, cur_len ) == 0 ) - { - ssl->alpn_chosen = *ours; - return( 0 ); - } - } - } - - /* If we get there, no match was found */ - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_NO_APPLICATION_PROTOCOL ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); -} -#endif /* MBEDTLS_SSL_ALPN */ - -#if defined(MBEDTLS_SSL_DTLS_SRTP) -static int ssl_parse_use_srtp_ext( mbedtls_ssl_context *ssl, - const unsigned char *buf, - size_t len ) -{ - mbedtls_ssl_srtp_profile client_protection = MBEDTLS_TLS_SRTP_UNSET; - size_t i,j; - size_t profile_length; - uint16_t mki_length; - /*! 2 bytes for profile length and 1 byte for mki len */ - const size_t size_of_lengths = 3; - - /* If use_srtp is not configured, just ignore the extension */ - if( ( ssl->conf->transport != MBEDTLS_SSL_TRANSPORT_DATAGRAM ) || - ( ssl->conf->dtls_srtp_profile_list == NULL ) || - ( ssl->conf->dtls_srtp_profile_list_len == 0 ) ) - { - return( 0 ); - } - - /* RFC5764 section 4.1.1 - * uint8 SRTPProtectionProfile[2]; - * - * struct { - * SRTPProtectionProfiles SRTPProtectionProfiles; - * opaque srtp_mki<0..255>; - * } UseSRTPData; - - * SRTPProtectionProfile SRTPProtectionProfiles<2..2^16-1>; - */ - - /* - * Min length is 5: at least one protection profile(2 bytes) - * and length(2 bytes) + srtp_mki length(1 byte) - * Check here that we have at least 2 bytes of protection profiles length - * and one of srtp_mki length - */ - if( len < size_of_lengths ) - { - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - - ssl->dtls_srtp_info.chosen_dtls_srtp_profile = MBEDTLS_TLS_SRTP_UNSET; - - /* first 2 bytes are protection profile length(in bytes) */ - profile_length = ( buf[0] << 8 ) | buf[1]; - buf += 2; - - /* The profile length cannot be bigger than input buffer size - lengths fields */ - if( profile_length > len - size_of_lengths || - profile_length % 2 != 0 ) /* profiles are 2 bytes long, so the length must be even */ - { - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - /* - * parse the extension list values are defined in - * http://www.iana.org/assignments/srtp-protection/srtp-protection.xhtml - */ - for( j = 0; j < profile_length; j += 2 ) - { - uint16_t protection_profile_value = buf[j] << 8 | buf[j + 1]; - client_protection = mbedtls_ssl_check_srtp_profile_value( protection_profile_value ); - - if( client_protection != MBEDTLS_TLS_SRTP_UNSET ) - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "found srtp profile: %s", - mbedtls_ssl_get_srtp_profile_as_string( - client_protection ) ) ); - } - else - { - continue; - } - /* check if suggested profile is in our list */ - for( i = 0; i < ssl->conf->dtls_srtp_profile_list_len; i++) - { - if( client_protection == ssl->conf->dtls_srtp_profile_list[i] ) - { - ssl->dtls_srtp_info.chosen_dtls_srtp_profile = ssl->conf->dtls_srtp_profile_list[i]; - MBEDTLS_SSL_DEBUG_MSG( 3, ( "selected srtp profile: %s", - mbedtls_ssl_get_srtp_profile_as_string( - client_protection ) ) ); - break; - } - } - if( ssl->dtls_srtp_info.chosen_dtls_srtp_profile != MBEDTLS_TLS_SRTP_UNSET ) - break; - } - buf += profile_length; /* buf points to the mki length */ - mki_length = *buf; - buf++; - - if( mki_length > MBEDTLS_TLS_SRTP_MAX_MKI_LENGTH || - mki_length + profile_length + size_of_lengths != len ) - { - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - - /* Parse the mki only if present and mki is supported locally */ - if( ssl->conf->dtls_srtp_mki_support == MBEDTLS_SSL_DTLS_SRTP_MKI_SUPPORTED && - mki_length > 0 ) - { - ssl->dtls_srtp_info.mki_len = mki_length; - - memcpy( ssl->dtls_srtp_info.mki_value, buf, mki_length ); - - MBEDTLS_SSL_DEBUG_BUF( 3, "using mki", ssl->dtls_srtp_info.mki_value, - ssl->dtls_srtp_info.mki_len ); - } - - return( 0 ); -} -#endif /* MBEDTLS_SSL_DTLS_SRTP */ - -/* - * Auxiliary functions for ServerHello parsing and related actions - */ - -#if defined(MBEDTLS_X509_CRT_PARSE_C) -/* - * Return 0 if the given key uses one of the acceptable curves, -1 otherwise - */ -#if defined(MBEDTLS_ECDSA_C) -static int ssl_check_key_curve( mbedtls_pk_context *pk, - const mbedtls_ecp_curve_info **curves ) -{ - const mbedtls_ecp_curve_info **crv = curves; - mbedtls_ecp_group_id grp_id = mbedtls_pk_ec( *pk )->grp.id; - - while( *crv != NULL ) - { - if( (*crv)->grp_id == grp_id ) - return( 0 ); - crv++; - } - - return( -1 ); -} -#endif /* MBEDTLS_ECDSA_C */ - -/* - * Try picking a certificate for this ciphersuite, - * return 0 on success and -1 on failure. - */ -static int ssl_pick_cert( mbedtls_ssl_context *ssl, - const mbedtls_ssl_ciphersuite_t * ciphersuite_info ) -{ - mbedtls_ssl_key_cert *cur, *list, *fallback = NULL; - mbedtls_pk_type_t pk_alg = - mbedtls_ssl_get_ciphersuite_sig_pk_alg( ciphersuite_info ); - uint32_t flags; - -#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION) - if( ssl->handshake->sni_key_cert != NULL ) - list = ssl->handshake->sni_key_cert; - else -#endif - list = ssl->conf->key_cert; - - if( pk_alg == MBEDTLS_PK_NONE ) - return( 0 ); - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "ciphersuite requires certificate" ) ); - - if( list == NULL ) - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "server has no certificate" ) ); - return( -1 ); - } - - for( cur = list; cur != NULL; cur = cur->next ) - { - flags = 0; - MBEDTLS_SSL_DEBUG_CRT( 3, "candidate certificate chain, certificate", - cur->cert ); - - if( ! mbedtls_pk_can_do( &cur->cert->pk, pk_alg ) ) - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "certificate mismatch: key type" ) ); - continue; - } - - /* - * This avoids sending the client a cert it'll reject based on - * keyUsage or other extensions. - * - * It also allows the user to provision different certificates for - * different uses based on keyUsage, eg if they want to avoid signing - * and decrypting with the same RSA key. - */ - if( mbedtls_ssl_check_cert_usage( cur->cert, ciphersuite_info, - MBEDTLS_SSL_IS_SERVER, &flags ) != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "certificate mismatch: " - "(extended) key usage extension" ) ); - continue; - } - -#if defined(MBEDTLS_ECDSA_C) - if( pk_alg == MBEDTLS_PK_ECDSA && - ssl_check_key_curve( &cur->cert->pk, ssl->handshake->curves ) != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "certificate mismatch: elliptic curve" ) ); - continue; - } -#endif - - /* - * Try to select a SHA-1 certificate for pre-1.2 clients, but still - * present them a SHA-higher cert rather than failing if it's the only - * one we got that satisfies the other conditions. - */ - if( ssl->minor_ver < MBEDTLS_SSL_MINOR_VERSION_3 && - cur->cert->sig_md != MBEDTLS_MD_SHA1 ) - { - if( fallback == NULL ) - fallback = cur; - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "certificate not preferred: " - "sha-2 with pre-TLS 1.2 client" ) ); - continue; - } - } - - /* If we get there, we got a winner */ - break; - } - - if( cur == NULL ) - cur = fallback; - - /* Do not update ssl->handshake->key_cert unless there is a match */ - if( cur != NULL ) - { - ssl->handshake->key_cert = cur; - MBEDTLS_SSL_DEBUG_CRT( 3, "selected certificate chain, certificate", - ssl->handshake->key_cert->cert ); - return( 0 ); - } - - return( -1 ); -} -#endif /* MBEDTLS_X509_CRT_PARSE_C */ - -/* - * Check if a given ciphersuite is suitable for use with our config/keys/etc - * Sets ciphersuite_info only if the suite matches. - */ -static int ssl_ciphersuite_match( mbedtls_ssl_context *ssl, int suite_id, - const mbedtls_ssl_ciphersuite_t **ciphersuite_info ) -{ - const mbedtls_ssl_ciphersuite_t *suite_info; - -#if defined(MBEDTLS_SSL_PROTO_TLS1_2) && \ - defined(MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED) - mbedtls_pk_type_t sig_type; -#endif - - suite_info = mbedtls_ssl_ciphersuite_from_id( suite_id ); - if( suite_info == NULL ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); - return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); - } - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "trying ciphersuite: %#04x (%s)", - (unsigned int) suite_id, suite_info->name ) ); - - if( suite_info->min_minor_ver > ssl->minor_ver || - suite_info->max_minor_ver < ssl->minor_ver ) - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "ciphersuite mismatch: version" ) ); - return( 0 ); - } - -#if defined(MBEDTLS_SSL_PROTO_DTLS) - if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM && - ( suite_info->flags & MBEDTLS_CIPHERSUITE_NODTLS ) ) - return( 0 ); -#endif - -#if defined(MBEDTLS_ARC4_C) - if( ssl->conf->arc4_disabled == MBEDTLS_SSL_ARC4_DISABLED && - suite_info->cipher == MBEDTLS_CIPHER_ARC4_128 ) - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "ciphersuite mismatch: rc4" ) ); - return( 0 ); - } -#endif - -#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED) - if( suite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECJPAKE && - ( ssl->handshake->cli_exts & MBEDTLS_TLS_EXT_ECJPAKE_KKPP_OK ) == 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "ciphersuite mismatch: ecjpake " - "not configured or ext missing" ) ); - return( 0 ); - } -#endif - - -#if defined(MBEDTLS_ECDH_C) || defined(MBEDTLS_ECDSA_C) - if( mbedtls_ssl_ciphersuite_uses_ec( suite_info ) && - ( ssl->handshake->curves == NULL || - ssl->handshake->curves[0] == NULL ) ) - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "ciphersuite mismatch: " - "no common elliptic curve" ) ); - return( 0 ); - } -#endif - -#if defined(MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED) - /* If the ciphersuite requires a pre-shared key and we don't - * have one, skip it now rather than failing later */ - if( mbedtls_ssl_ciphersuite_uses_psk( suite_info ) && - ssl_conf_has_psk_or_cb( ssl->conf ) == 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "ciphersuite mismatch: no pre-shared key" ) ); - return( 0 ); - } -#endif - -#if defined(MBEDTLS_SSL_PROTO_TLS1_2) && \ - defined(MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED) - /* If the ciphersuite requires signing, check whether - * a suitable hash algorithm is present. */ - if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 ) - { - sig_type = mbedtls_ssl_get_ciphersuite_sig_alg( suite_info ); - if( sig_type != MBEDTLS_PK_NONE && - mbedtls_ssl_sig_hash_set_find( &ssl->handshake->hash_algs, sig_type ) == MBEDTLS_MD_NONE ) - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "ciphersuite mismatch: no suitable hash algorithm " - "for signature algorithm %u", (unsigned) sig_type ) ); - return( 0 ); - } - } - -#endif /* MBEDTLS_SSL_PROTO_TLS1_2 && - MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED */ - -#if defined(MBEDTLS_X509_CRT_PARSE_C) - /* - * Final check: if ciphersuite requires us to have a - * certificate/key of a particular type: - * - select the appropriate certificate if we have one, or - * - try the next ciphersuite if we don't - * This must be done last since we modify the key_cert list. - */ - if( ssl_pick_cert( ssl, suite_info ) != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "ciphersuite mismatch: " - "no suitable certificate" ) ); - return( 0 ); - } -#endif - - *ciphersuite_info = suite_info; - return( 0 ); -} - -#if defined(MBEDTLS_SSL_SRV_SUPPORT_SSLV2_CLIENT_HELLO) -static int ssl_parse_client_hello_v2( mbedtls_ssl_context *ssl ) -{ - int ret, got_common_suite; - unsigned int i, j; - size_t n; - unsigned int ciph_len, sess_len, chal_len; - unsigned char *buf, *p; - const int *ciphersuites; - const mbedtls_ssl_ciphersuite_t *ciphersuite_info; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse client hello v2" ) ); - -#if defined(MBEDTLS_SSL_RENEGOTIATION) - if( ssl->renego_status != MBEDTLS_SSL_INITIAL_HANDSHAKE ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "client hello v2 illegal for renegotiation" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } -#endif /* MBEDTLS_SSL_RENEGOTIATION */ - - buf = ssl->in_hdr; - - MBEDTLS_SSL_DEBUG_BUF( 4, "record header", buf, 5 ); - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello v2, message type: %d", - buf[2] ) ); - MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello v2, message len.: %d", - ( ( buf[0] & 0x7F ) << 8 ) | buf[1] ) ); - MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello v2, max. version: [%d:%d]", - buf[3], buf[4] ) ); - - /* - * SSLv2 Client Hello - * - * Record layer: - * 0 . 1 message length - * - * SSL layer: - * 2 . 2 message type - * 3 . 4 protocol version - */ - if( buf[2] != MBEDTLS_SSL_HS_CLIENT_HELLO || - buf[3] != MBEDTLS_SSL_MAJOR_VERSION_3 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - - n = ( ( buf[0] << 8 ) | buf[1] ) & 0x7FFF; - - if( n < 17 || n > 512 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - - ssl->major_ver = MBEDTLS_SSL_MAJOR_VERSION_3; - ssl->minor_ver = ( buf[4] <= ssl->conf->max_minor_ver ) - ? buf[4] : ssl->conf->max_minor_ver; - - if( ssl->minor_ver < ssl->conf->min_minor_ver ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "client only supports ssl smaller than minimum" - " [%d:%d] < [%d:%d]", - ssl->major_ver, ssl->minor_ver, - ssl->conf->min_major_ver, ssl->conf->min_minor_ver ) ); - - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_PROTOCOL_VERSION ); - return( MBEDTLS_ERR_SSL_BAD_HS_PROTOCOL_VERSION ); - } - - ssl->handshake->max_major_ver = buf[3]; - ssl->handshake->max_minor_ver = buf[4]; - - if( ( ret = mbedtls_ssl_fetch_input( ssl, 2 + n ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_fetch_input", ret ); - return( ret ); - } - - ssl->handshake->update_checksum( ssl, buf + 2, n ); - - buf = ssl->in_msg; - n = ssl->in_left - 5; - - /* - * 0 . 1 ciphersuitelist length - * 2 . 3 session id length - * 4 . 5 challenge length - * 6 . .. ciphersuitelist - * .. . .. session id - * .. . .. challenge - */ - MBEDTLS_SSL_DEBUG_BUF( 4, "record contents", buf, n ); - - ciph_len = ( buf[0] << 8 ) | buf[1]; - sess_len = ( buf[2] << 8 ) | buf[3]; - chal_len = ( buf[4] << 8 ) | buf[5]; - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "ciph_len: %u, sess_len: %u, chal_len: %u", - ciph_len, sess_len, chal_len ) ); - - /* - * Make sure each parameter length is valid - */ - if( ciph_len < 3 || ( ciph_len % 3 ) != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - - if( sess_len > 32 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - - if( chal_len < 8 || chal_len > 32 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - - if( n != 6 + ciph_len + sess_len + chal_len ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - - MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, ciphersuitelist", - buf + 6, ciph_len ); - MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, session id", - buf + 6 + ciph_len, sess_len ); - MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, challenge", - buf + 6 + ciph_len + sess_len, chal_len ); - - p = buf + 6 + ciph_len; - ssl->session_negotiate->id_len = sess_len; - memset( ssl->session_negotiate->id, 0, - sizeof( ssl->session_negotiate->id ) ); - memcpy( ssl->session_negotiate->id, p, ssl->session_negotiate->id_len ); - - p += sess_len; - memset( ssl->handshake->randbytes, 0, 64 ); - memcpy( ssl->handshake->randbytes + 32 - chal_len, p, chal_len ); - - /* - * Check for TLS_EMPTY_RENEGOTIATION_INFO_SCSV - */ - for( i = 0, p = buf + 6; i < ciph_len; i += 3, p += 3 ) - { - if( p[0] == 0 && p[1] == 0 && p[2] == MBEDTLS_SSL_EMPTY_RENEGOTIATION_INFO ) - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "received TLS_EMPTY_RENEGOTIATION_INFO " ) ); -#if defined(MBEDTLS_SSL_RENEGOTIATION) - if( ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "received RENEGOTIATION SCSV " - "during renegotiation" ) ); - - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } -#endif /* MBEDTLS_SSL_RENEGOTIATION */ - ssl->secure_renegotiation = MBEDTLS_SSL_SECURE_RENEGOTIATION; - break; - } - } - -#if defined(MBEDTLS_SSL_FALLBACK_SCSV) - for( i = 0, p = buf + 6; i < ciph_len; i += 3, p += 3 ) - { - if( p[0] == 0 && - p[1] == (unsigned char)( ( MBEDTLS_SSL_FALLBACK_SCSV_VALUE >> 8 ) & 0xff ) && - p[2] == (unsigned char)( ( MBEDTLS_SSL_FALLBACK_SCSV_VALUE ) & 0xff ) ) - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "received FALLBACK_SCSV" ) ); - - if( ssl->minor_ver < ssl->conf->max_minor_ver ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "inapropriate fallback" ) ); - - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_INAPROPRIATE_FALLBACK ); - - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - - break; - } - } -#endif /* MBEDTLS_SSL_FALLBACK_SCSV */ - - got_common_suite = 0; - ciphersuites = ssl->conf->ciphersuite_list[ssl->minor_ver]; - ciphersuite_info = NULL; -#if defined(MBEDTLS_SSL_SRV_RESPECT_CLIENT_PREFERENCE) - for( j = 0, p = buf + 6; j < ciph_len; j += 3, p += 3 ) - for( i = 0; ciphersuites[i] != 0; i++ ) -#else - for( i = 0; ciphersuites[i] != 0; i++ ) - for( j = 0, p = buf + 6; j < ciph_len; j += 3, p += 3 ) -#endif - { - if( p[0] != 0 || - p[1] != ( ( ciphersuites[i] >> 8 ) & 0xFF ) || - p[2] != ( ( ciphersuites[i] ) & 0xFF ) ) - continue; - - got_common_suite = 1; - - if( ( ret = ssl_ciphersuite_match( ssl, ciphersuites[i], - &ciphersuite_info ) ) != 0 ) - return( ret ); - - if( ciphersuite_info != NULL ) - goto have_ciphersuite_v2; - } - - if( got_common_suite ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "got ciphersuites in common, " - "but none of them usable" ) ); - return( MBEDTLS_ERR_SSL_NO_USABLE_CIPHERSUITE ); - } - else - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "got no ciphersuites in common" ) ); - return( MBEDTLS_ERR_SSL_NO_CIPHER_CHOSEN ); - } - -have_ciphersuite_v2: - MBEDTLS_SSL_DEBUG_MSG( 2, ( "selected ciphersuite: %s", ciphersuite_info->name ) ); - - ssl->session_negotiate->ciphersuite = ciphersuites[i]; - ssl->handshake->ciphersuite_info = ciphersuite_info; - - /* - * SSLv2 Client Hello relevant renegotiation security checks - */ - if( ssl->secure_renegotiation == MBEDTLS_SSL_LEGACY_RENEGOTIATION && - ssl->conf->allow_legacy_renegotiation == MBEDTLS_SSL_LEGACY_BREAK_HANDSHAKE ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "legacy renegotiation, breaking off handshake" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - - ssl->in_left = 0; - ssl->state++; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse client hello v2" ) ); - - return( 0 ); -} -#endif /* MBEDTLS_SSL_SRV_SUPPORT_SSLV2_CLIENT_HELLO */ - -/* This function doesn't alert on errors that happen early during - ClientHello parsing because they might indicate that the client is - not talking SSL/TLS at all and would not understand our alert. */ -static int ssl_parse_client_hello( mbedtls_ssl_context *ssl ) -{ - int ret, got_common_suite; - size_t i, j; - size_t ciph_offset, comp_offset, ext_offset; - size_t msg_len, ciph_len, sess_len, comp_len, ext_len; -#if defined(MBEDTLS_SSL_PROTO_DTLS) - size_t cookie_offset, cookie_len; -#endif - unsigned char *buf, *p, *ext; -#if defined(MBEDTLS_SSL_RENEGOTIATION) - int renegotiation_info_seen = 0; -#endif - int handshake_failure = 0; - const int *ciphersuites; - const mbedtls_ssl_ciphersuite_t *ciphersuite_info; - int major, minor; - - /* If there is no signature-algorithm extension present, - * we need to fall back to the default values for allowed - * signature-hash pairs. */ -#if defined(MBEDTLS_SSL_PROTO_TLS1_2) && \ - defined(MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED) - int sig_hash_alg_ext_present = 0; -#endif /* MBEDTLS_SSL_PROTO_TLS1_2 && - MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED */ - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse client hello" ) ); - -#if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY) -read_record_header: -#endif - /* - * If renegotiating, then the input was read with mbedtls_ssl_read_record(), - * otherwise read it ourselves manually in order to support SSLv2 - * ClientHello, which doesn't use the same record layer format. - */ -#if defined(MBEDTLS_SSL_RENEGOTIATION) - if( ssl->renego_status == MBEDTLS_SSL_INITIAL_HANDSHAKE ) -#endif - { - if( ( ret = mbedtls_ssl_fetch_input( ssl, 5 ) ) != 0 ) - { - /* No alert on a read error. */ - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_fetch_input", ret ); - return( ret ); - } - } - - buf = ssl->in_hdr; - -#if defined(MBEDTLS_SSL_SRV_SUPPORT_SSLV2_CLIENT_HELLO) -#if defined(MBEDTLS_SSL_PROTO_DTLS) - if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_STREAM ) -#endif - if( ( buf[0] & 0x80 ) != 0 ) - return( ssl_parse_client_hello_v2( ssl ) ); -#endif - - MBEDTLS_SSL_DEBUG_BUF( 4, "record header", buf, mbedtls_ssl_in_hdr_len( ssl ) ); - - /* - * SSLv3/TLS Client Hello - * - * Record layer: - * 0 . 0 message type - * 1 . 2 protocol version - * 3 . 11 DTLS: epoch + record sequence number - * 3 . 4 message length - */ - MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello v3, message type: %d", - buf[0] ) ); - - if( buf[0] != MBEDTLS_SSL_MSG_HANDSHAKE ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello v3, message len.: %d", - ( ssl->in_len[0] << 8 ) | ssl->in_len[1] ) ); - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello v3, protocol version: [%d:%d]", - buf[1], buf[2] ) ); - - mbedtls_ssl_read_version( &major, &minor, ssl->conf->transport, buf + 1 ); - - /* According to RFC 5246 Appendix E.1, the version here is typically - * "{03,00}, the lowest version number supported by the client, [or] the - * value of ClientHello.client_version", so the only meaningful check here - * is the major version shouldn't be less than 3 */ - if( major < MBEDTLS_SSL_MAJOR_VERSION_3 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - - /* For DTLS if this is the initial handshake, remember the client sequence - * number to use it in our next message (RFC 6347 4.2.1) */ -#if defined(MBEDTLS_SSL_PROTO_DTLS) - if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM -#if defined(MBEDTLS_SSL_RENEGOTIATION) - && ssl->renego_status == MBEDTLS_SSL_INITIAL_HANDSHAKE -#endif - ) - { - /* Epoch should be 0 for initial handshakes */ - if( ssl->in_ctr[0] != 0 || ssl->in_ctr[1] != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - - memcpy( ssl->cur_out_ctr + 2, ssl->in_ctr + 2, 6 ); - -#if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY) - if( mbedtls_ssl_dtls_replay_check( ssl ) != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "replayed record, discarding" ) ); - ssl->next_record_offset = 0; - ssl->in_left = 0; - goto read_record_header; - } - - /* No MAC to check yet, so we can update right now */ - mbedtls_ssl_dtls_replay_update( ssl ); -#endif - } -#endif /* MBEDTLS_SSL_PROTO_DTLS */ - - msg_len = ( ssl->in_len[0] << 8 ) | ssl->in_len[1]; - -#if defined(MBEDTLS_SSL_RENEGOTIATION) - if( ssl->renego_status != MBEDTLS_SSL_INITIAL_HANDSHAKE ) - { - /* Set by mbedtls_ssl_read_record() */ - msg_len = ssl->in_hslen; - } - else -#endif - { - if( msg_len > MBEDTLS_SSL_IN_CONTENT_LEN ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - - if( ( ret = mbedtls_ssl_fetch_input( ssl, - mbedtls_ssl_in_hdr_len( ssl ) + msg_len ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_fetch_input", ret ); - return( ret ); - } - - /* Done reading this record, get ready for the next one */ -#if defined(MBEDTLS_SSL_PROTO_DTLS) - if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) - ssl->next_record_offset = msg_len + mbedtls_ssl_in_hdr_len( ssl ); - else -#endif - ssl->in_left = 0; - } - - buf = ssl->in_msg; - - MBEDTLS_SSL_DEBUG_BUF( 4, "record contents", buf, msg_len ); - - ssl->handshake->update_checksum( ssl, buf, msg_len ); - - /* - * Handshake layer: - * 0 . 0 handshake type - * 1 . 3 handshake length - * 4 . 5 DTLS only: message seqence number - * 6 . 8 DTLS only: fragment offset - * 9 . 11 DTLS only: fragment length - */ - if( msg_len < mbedtls_ssl_hs_hdr_len( ssl ) ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello v3, handshake type: %d", buf[0] ) ); - - if( buf[0] != MBEDTLS_SSL_HS_CLIENT_HELLO ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello v3, handshake len.: %d", - ( buf[1] << 16 ) | ( buf[2] << 8 ) | buf[3] ) ); - - /* We don't support fragmentation of ClientHello (yet?) */ - if( buf[1] != 0 || - msg_len != mbedtls_ssl_hs_hdr_len( ssl ) + ( ( buf[2] << 8 ) | buf[3] ) ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - -#if defined(MBEDTLS_SSL_PROTO_DTLS) - if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) - { - /* - * Copy the client's handshake message_seq on initial handshakes, - * check sequence number on renego. - */ -#if defined(MBEDTLS_SSL_RENEGOTIATION) - if( ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS ) - { - /* This couldn't be done in ssl_prepare_handshake_record() */ - unsigned int cli_msg_seq = ( ssl->in_msg[4] << 8 ) | - ssl->in_msg[5]; - - if( cli_msg_seq != ssl->handshake->in_msg_seq ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message_seq: " - "%u (expected %u)", cli_msg_seq, - ssl->handshake->in_msg_seq ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - - ssl->handshake->in_msg_seq++; - } - else -#endif - { - unsigned int cli_msg_seq = ( ssl->in_msg[4] << 8 ) | - ssl->in_msg[5]; - ssl->handshake->out_msg_seq = cli_msg_seq; - ssl->handshake->in_msg_seq = cli_msg_seq + 1; - } - - /* - * For now we don't support fragmentation, so make sure - * fragment_offset == 0 and fragment_length == length - */ - if( ssl->in_msg[6] != 0 || ssl->in_msg[7] != 0 || ssl->in_msg[8] != 0 || - memcmp( ssl->in_msg + 1, ssl->in_msg + 9, 3 ) != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "ClientHello fragmentation not supported" ) ); - return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE ); - } - } -#endif /* MBEDTLS_SSL_PROTO_DTLS */ - - buf += mbedtls_ssl_hs_hdr_len( ssl ); - msg_len -= mbedtls_ssl_hs_hdr_len( ssl ); - - /* - * ClientHello layer: - * 0 . 1 protocol version - * 2 . 33 random bytes (starting with 4 bytes of Unix time) - * 34 . 35 session id length (1 byte) - * 35 . 34+x session id - * 35+x . 35+x DTLS only: cookie length (1 byte) - * 36+x . .. DTLS only: cookie - * .. . .. ciphersuite list length (2 bytes) - * .. . .. ciphersuite list - * .. . .. compression alg. list length (1 byte) - * .. . .. compression alg. list - * .. . .. extensions length (2 bytes, optional) - * .. . .. extensions (optional) - */ - - /* - * Minimal length (with everything empty and extensions omitted) is - * 2 + 32 + 1 + 2 + 1 = 38 bytes. Check that first, so that we can - * read at least up to session id length without worrying. - */ - if( msg_len < 38 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - - /* - * Check and save the protocol version - */ - MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, version", buf, 2 ); - - mbedtls_ssl_read_version( &ssl->major_ver, &ssl->minor_ver, - ssl->conf->transport, buf ); - - ssl->handshake->max_major_ver = ssl->major_ver; - ssl->handshake->max_minor_ver = ssl->minor_ver; - - if( ssl->major_ver < ssl->conf->min_major_ver || - ssl->minor_ver < ssl->conf->min_minor_ver ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "client only supports ssl smaller than minimum" - " [%d:%d] < [%d:%d]", - ssl->major_ver, ssl->minor_ver, - ssl->conf->min_major_ver, ssl->conf->min_minor_ver ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_PROTOCOL_VERSION ); - return( MBEDTLS_ERR_SSL_BAD_HS_PROTOCOL_VERSION ); - } - - if( ssl->major_ver > ssl->conf->max_major_ver ) - { - ssl->major_ver = ssl->conf->max_major_ver; - ssl->minor_ver = ssl->conf->max_minor_ver; - } - else if( ssl->minor_ver > ssl->conf->max_minor_ver ) - ssl->minor_ver = ssl->conf->max_minor_ver; - - /* - * Save client random (inc. Unix time) - */ - MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, random bytes", buf + 2, 32 ); - - memcpy( ssl->handshake->randbytes, buf + 2, 32 ); - - /* - * Check the session ID length and save session ID - */ - sess_len = buf[34]; - - if( sess_len > sizeof( ssl->session_negotiate->id ) || - sess_len + 34 + 2 > msg_len ) /* 2 for cipherlist length field */ - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - - MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, session id", buf + 35, sess_len ); - - ssl->session_negotiate->id_len = sess_len; - memset( ssl->session_negotiate->id, 0, - sizeof( ssl->session_negotiate->id ) ); - memcpy( ssl->session_negotiate->id, buf + 35, - ssl->session_negotiate->id_len ); - - /* - * Check the cookie length and content - */ -#if defined(MBEDTLS_SSL_PROTO_DTLS) - if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) - { - cookie_offset = 35 + sess_len; - cookie_len = buf[cookie_offset]; - - if( cookie_offset + 1 + cookie_len + 2 > msg_len ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_PROTOCOL_VERSION ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - - MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, cookie", - buf + cookie_offset + 1, cookie_len ); - -#if defined(MBEDTLS_SSL_DTLS_HELLO_VERIFY) - if( ssl->conf->f_cookie_check != NULL -#if defined(MBEDTLS_SSL_RENEGOTIATION) - && ssl->renego_status == MBEDTLS_SSL_INITIAL_HANDSHAKE -#endif - ) - { - if( ssl->conf->f_cookie_check( ssl->conf->p_cookie, - buf + cookie_offset + 1, cookie_len, - ssl->cli_id, ssl->cli_id_len ) != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "cookie verification failed" ) ); - ssl->handshake->verify_cookie_len = 1; - } - else - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "cookie verification passed" ) ); - ssl->handshake->verify_cookie_len = 0; - } - } - else -#endif /* MBEDTLS_SSL_DTLS_HELLO_VERIFY */ - { - /* We know we didn't send a cookie, so it should be empty */ - if( cookie_len != 0 ) - { - /* This may be an attacker's probe, so don't send an alert */ - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "cookie verification skipped" ) ); - } - - /* - * Check the ciphersuitelist length (will be parsed later) - */ - ciph_offset = cookie_offset + 1 + cookie_len; - } - else -#endif /* MBEDTLS_SSL_PROTO_DTLS */ - ciph_offset = 35 + sess_len; - - ciph_len = ( buf[ciph_offset + 0] << 8 ) - | ( buf[ciph_offset + 1] ); - - if( ciph_len < 2 || - ciph_len + 2 + ciph_offset + 1 > msg_len || /* 1 for comp. alg. len */ - ( ciph_len % 2 ) != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - - MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, ciphersuitelist", - buf + ciph_offset + 2, ciph_len ); - - /* - * Check the compression algorithms length and pick one - */ - comp_offset = ciph_offset + 2 + ciph_len; - - comp_len = buf[comp_offset]; - - if( comp_len < 1 || - comp_len > 16 || - comp_len + comp_offset + 1 > msg_len ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - - MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, compression", - buf + comp_offset + 1, comp_len ); - - ssl->session_negotiate->compression = MBEDTLS_SSL_COMPRESS_NULL; -#if defined(MBEDTLS_ZLIB_SUPPORT) - for( i = 0; i < comp_len; ++i ) - { - if( buf[comp_offset + 1 + i] == MBEDTLS_SSL_COMPRESS_DEFLATE ) - { - ssl->session_negotiate->compression = MBEDTLS_SSL_COMPRESS_DEFLATE; - break; - } - } -#endif - - /* See comments in ssl_write_client_hello() */ -#if defined(MBEDTLS_SSL_PROTO_DTLS) - if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) - ssl->session_negotiate->compression = MBEDTLS_SSL_COMPRESS_NULL; -#endif - - /* Do not parse the extensions if the protocol is SSLv3 */ -#if defined(MBEDTLS_SSL_PROTO_SSL3) - if( ( ssl->major_ver != 3 ) || ( ssl->minor_ver != 0 ) ) - { -#endif - /* - * Check the extension length - */ - ext_offset = comp_offset + 1 + comp_len; - if( msg_len > ext_offset ) - { - if( msg_len < ext_offset + 2 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - - ext_len = ( buf[ext_offset + 0] << 8 ) - | ( buf[ext_offset + 1] ); - - if( msg_len != ext_offset + 2 + ext_len ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - } - else - ext_len = 0; - - ext = buf + ext_offset + 2; - MBEDTLS_SSL_DEBUG_BUF( 3, "client hello extensions", ext, ext_len ); - - while( ext_len != 0 ) - { - unsigned int ext_id; - unsigned int ext_size; - if ( ext_len < 4 ) { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - ext_id = ( ( ext[0] << 8 ) | ( ext[1] ) ); - ext_size = ( ( ext[2] << 8 ) | ( ext[3] ) ); - - if( ext_size + 4 > ext_len ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - switch( ext_id ) - { -#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION) - case MBEDTLS_TLS_EXT_SERVERNAME: - MBEDTLS_SSL_DEBUG_MSG( 3, ( "found ServerName extension" ) ); - if( ssl->conf->f_sni == NULL ) - break; - - ret = ssl_parse_servername_ext( ssl, ext + 4, ext_size ); - if( ret != 0 ) - return( ret ); - break; -#endif /* MBEDTLS_SSL_SERVER_NAME_INDICATION */ - - case MBEDTLS_TLS_EXT_RENEGOTIATION_INFO: - MBEDTLS_SSL_DEBUG_MSG( 3, ( "found renegotiation extension" ) ); -#if defined(MBEDTLS_SSL_RENEGOTIATION) - renegotiation_info_seen = 1; -#endif - - ret = ssl_parse_renegotiation_info( ssl, ext + 4, ext_size ); - if( ret != 0 ) - return( ret ); - break; - -#if defined(MBEDTLS_SSL_PROTO_TLS1_2) && \ - defined(MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED) - case MBEDTLS_TLS_EXT_SIG_ALG: - MBEDTLS_SSL_DEBUG_MSG( 3, ( "found signature_algorithms extension" ) ); - - ret = ssl_parse_signature_algorithms_ext( ssl, ext + 4, ext_size ); - if( ret != 0 ) - return( ret ); - - sig_hash_alg_ext_present = 1; - break; -#endif /* MBEDTLS_SSL_PROTO_TLS1_2 && - MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED */ - -#if defined(MBEDTLS_ECDH_C) || defined(MBEDTLS_ECDSA_C) || \ - defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED) - case MBEDTLS_TLS_EXT_SUPPORTED_ELLIPTIC_CURVES: - MBEDTLS_SSL_DEBUG_MSG( 3, ( "found supported elliptic curves extension" ) ); - - ret = ssl_parse_supported_elliptic_curves( ssl, ext + 4, ext_size ); - if( ret != 0 ) - return( ret ); - break; - - case MBEDTLS_TLS_EXT_SUPPORTED_POINT_FORMATS: - MBEDTLS_SSL_DEBUG_MSG( 3, ( "found supported point formats extension" ) ); - ssl->handshake->cli_exts |= MBEDTLS_TLS_EXT_SUPPORTED_POINT_FORMATS_PRESENT; - - ret = ssl_parse_supported_point_formats( ssl, ext + 4, ext_size ); - if( ret != 0 ) - return( ret ); - break; -#endif /* MBEDTLS_ECDH_C || MBEDTLS_ECDSA_C || - MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */ - -#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED) - case MBEDTLS_TLS_EXT_ECJPAKE_KKPP: - MBEDTLS_SSL_DEBUG_MSG( 3, ( "found ecjpake kkpp extension" ) ); - - ret = ssl_parse_ecjpake_kkpp( ssl, ext + 4, ext_size ); - if( ret != 0 ) - return( ret ); - break; -#endif /* MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */ - -#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH) - case MBEDTLS_TLS_EXT_MAX_FRAGMENT_LENGTH: - MBEDTLS_SSL_DEBUG_MSG( 3, ( "found max fragment length extension" ) ); - - ret = ssl_parse_max_fragment_length_ext( ssl, ext + 4, ext_size ); - if( ret != 0 ) - return( ret ); - break; -#endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */ - -#if defined(MBEDTLS_SSL_TRUNCATED_HMAC) - case MBEDTLS_TLS_EXT_TRUNCATED_HMAC: - MBEDTLS_SSL_DEBUG_MSG( 3, ( "found truncated hmac extension" ) ); - - ret = ssl_parse_truncated_hmac_ext( ssl, ext + 4, ext_size ); - if( ret != 0 ) - return( ret ); - break; -#endif /* MBEDTLS_SSL_TRUNCATED_HMAC */ - -#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID) - case MBEDTLS_TLS_EXT_CID: - MBEDTLS_SSL_DEBUG_MSG( 3, ( "found CID extension" ) ); - - ret = ssl_parse_cid_ext( ssl, ext + 4, ext_size ); - if( ret != 0 ) - return( ret ); - break; -#endif /* MBEDTLS_SSL_TRUNCATED_HMAC */ - -#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC) - case MBEDTLS_TLS_EXT_ENCRYPT_THEN_MAC: - MBEDTLS_SSL_DEBUG_MSG( 3, ( "found encrypt then mac extension" ) ); - - ret = ssl_parse_encrypt_then_mac_ext( ssl, ext + 4, ext_size ); - if( ret != 0 ) - return( ret ); - break; -#endif /* MBEDTLS_SSL_ENCRYPT_THEN_MAC */ - -#if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET) - case MBEDTLS_TLS_EXT_EXTENDED_MASTER_SECRET: - MBEDTLS_SSL_DEBUG_MSG( 3, ( "found extended master secret extension" ) ); - - ret = ssl_parse_extended_ms_ext( ssl, ext + 4, ext_size ); - if( ret != 0 ) - return( ret ); - break; -#endif /* MBEDTLS_SSL_EXTENDED_MASTER_SECRET */ - -#if defined(MBEDTLS_SSL_SESSION_TICKETS) - case MBEDTLS_TLS_EXT_SESSION_TICKET: - MBEDTLS_SSL_DEBUG_MSG( 3, ( "found session ticket extension" ) ); - - ret = ssl_parse_session_ticket_ext( ssl, ext + 4, ext_size ); - if( ret != 0 ) - return( ret ); - break; -#endif /* MBEDTLS_SSL_SESSION_TICKETS */ - -#if defined(MBEDTLS_SSL_ALPN) - case MBEDTLS_TLS_EXT_ALPN: - MBEDTLS_SSL_DEBUG_MSG( 3, ( "found alpn extension" ) ); - - ret = ssl_parse_alpn_ext( ssl, ext + 4, ext_size ); - if( ret != 0 ) - return( ret ); - break; -#endif /* MBEDTLS_SSL_SESSION_TICKETS */ - -#if defined(MBEDTLS_SSL_DTLS_SRTP) - case MBEDTLS_TLS_EXT_USE_SRTP: - MBEDTLS_SSL_DEBUG_MSG( 3, ( "found use_srtp extension" ) ); - - ret = ssl_parse_use_srtp_ext( ssl, ext + 4, ext_size ); - if( ret != 0 ) - return( ret ); - break; -#endif /* MBEDTLS_SSL_DTLS_SRTP */ - - default: - MBEDTLS_SSL_DEBUG_MSG( 3, ( "unknown extension found: %u (ignoring)", - ext_id ) ); - } - - ext_len -= 4 + ext_size; - ext += 4 + ext_size; - } -#if defined(MBEDTLS_SSL_PROTO_SSL3) - } -#endif - -#if defined(MBEDTLS_SSL_FALLBACK_SCSV) - for( i = 0, p = buf + ciph_offset + 2; i < ciph_len; i += 2, p += 2 ) - { - if( p[0] == (unsigned char)( ( MBEDTLS_SSL_FALLBACK_SCSV_VALUE >> 8 ) & 0xff ) && - p[1] == (unsigned char)( ( MBEDTLS_SSL_FALLBACK_SCSV_VALUE ) & 0xff ) ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "received FALLBACK_SCSV" ) ); - - if( ssl->minor_ver < ssl->conf->max_minor_ver ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "inapropriate fallback" ) ); - - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_INAPROPRIATE_FALLBACK ); - - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - - break; - } - } -#endif /* MBEDTLS_SSL_FALLBACK_SCSV */ - -#if defined(MBEDTLS_SSL_PROTO_TLS1_2) && \ - defined(MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED) - - /* - * Try to fall back to default hash SHA1 if the client - * hasn't provided any preferred signature-hash combinations. - */ - if( sig_hash_alg_ext_present == 0 ) - { - mbedtls_md_type_t md_default = MBEDTLS_MD_SHA1; - - if( mbedtls_ssl_check_sig_hash( ssl, md_default ) != 0 ) - md_default = MBEDTLS_MD_NONE; - - mbedtls_ssl_sig_hash_set_const_hash( &ssl->handshake->hash_algs, md_default ); - } - -#endif /* MBEDTLS_SSL_PROTO_TLS1_2 && - MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED */ - - /* - * Check for TLS_EMPTY_RENEGOTIATION_INFO_SCSV - */ - for( i = 0, p = buf + ciph_offset + 2; i < ciph_len; i += 2, p += 2 ) - { - if( p[0] == 0 && p[1] == MBEDTLS_SSL_EMPTY_RENEGOTIATION_INFO ) - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "received TLS_EMPTY_RENEGOTIATION_INFO " ) ); -#if defined(MBEDTLS_SSL_RENEGOTIATION) - if( ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "received RENEGOTIATION SCSV " - "during renegotiation" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } -#endif - ssl->secure_renegotiation = MBEDTLS_SSL_SECURE_RENEGOTIATION; - break; - } - } - - /* - * Renegotiation security checks - */ - if( ssl->secure_renegotiation != MBEDTLS_SSL_SECURE_RENEGOTIATION && - ssl->conf->allow_legacy_renegotiation == MBEDTLS_SSL_LEGACY_BREAK_HANDSHAKE ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "legacy renegotiation, breaking off handshake" ) ); - handshake_failure = 1; - } -#if defined(MBEDTLS_SSL_RENEGOTIATION) - else if( ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS && - ssl->secure_renegotiation == MBEDTLS_SSL_SECURE_RENEGOTIATION && - renegotiation_info_seen == 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "renegotiation_info extension missing (secure)" ) ); - handshake_failure = 1; - } - else if( ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS && - ssl->secure_renegotiation == MBEDTLS_SSL_LEGACY_RENEGOTIATION && - ssl->conf->allow_legacy_renegotiation == MBEDTLS_SSL_LEGACY_NO_RENEGOTIATION ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "legacy renegotiation not allowed" ) ); - handshake_failure = 1; - } - else if( ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS && - ssl->secure_renegotiation == MBEDTLS_SSL_LEGACY_RENEGOTIATION && - renegotiation_info_seen == 1 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "renegotiation_info extension present (legacy)" ) ); - handshake_failure = 1; - } -#endif /* MBEDTLS_SSL_RENEGOTIATION */ - - if( handshake_failure == 1 ) - { - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - - /* - * Search for a matching ciphersuite - * (At the end because we need information from the EC-based extensions - * and certificate from the SNI callback triggered by the SNI extension.) - */ - got_common_suite = 0; - ciphersuites = ssl->conf->ciphersuite_list[ssl->minor_ver]; - ciphersuite_info = NULL; -#if defined(MBEDTLS_SSL_SRV_RESPECT_CLIENT_PREFERENCE) - for( j = 0, p = buf + ciph_offset + 2; j < ciph_len; j += 2, p += 2 ) - for( i = 0; ciphersuites[i] != 0; i++ ) -#else - for( i = 0; ciphersuites[i] != 0; i++ ) - for( j = 0, p = buf + ciph_offset + 2; j < ciph_len; j += 2, p += 2 ) -#endif - { - if( p[0] != ( ( ciphersuites[i] >> 8 ) & 0xFF ) || - p[1] != ( ( ciphersuites[i] ) & 0xFF ) ) - continue; - - got_common_suite = 1; - - if( ( ret = ssl_ciphersuite_match( ssl, ciphersuites[i], - &ciphersuite_info ) ) != 0 ) - return( ret ); - - if( ciphersuite_info != NULL ) - goto have_ciphersuite; - } - - if( got_common_suite ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "got ciphersuites in common, " - "but none of them usable" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE ); - return( MBEDTLS_ERR_SSL_NO_USABLE_CIPHERSUITE ); - } - else - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "got no ciphersuites in common" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE ); - return( MBEDTLS_ERR_SSL_NO_CIPHER_CHOSEN ); - } - -have_ciphersuite: - MBEDTLS_SSL_DEBUG_MSG( 2, ( "selected ciphersuite: %s", ciphersuite_info->name ) ); - - ssl->session_negotiate->ciphersuite = ciphersuites[i]; - ssl->handshake->ciphersuite_info = ciphersuite_info; - - ssl->state++; - -#if defined(MBEDTLS_SSL_PROTO_DTLS) - if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) - mbedtls_ssl_recv_flight_completed( ssl ); -#endif - - /* Debugging-only output for testsuite */ -#if defined(MBEDTLS_DEBUG_C) && \ - defined(MBEDTLS_SSL_PROTO_TLS1_2) && \ - defined(MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED) - if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 ) - { - mbedtls_pk_type_t sig_alg = mbedtls_ssl_get_ciphersuite_sig_alg( ciphersuite_info ); - if( sig_alg != MBEDTLS_PK_NONE ) - { - mbedtls_md_type_t md_alg = mbedtls_ssl_sig_hash_set_find( &ssl->handshake->hash_algs, - sig_alg ); - MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello v3, signature_algorithm ext: %d", - mbedtls_ssl_hash_from_md_alg( md_alg ) ) ); - } - else - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "no hash algorithm for signature algorithm " - "%u - should not happen", (unsigned) sig_alg ) ); - } - } -#endif - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse client hello" ) ); - - return( 0 ); -} - -#if defined(MBEDTLS_SSL_TRUNCATED_HMAC) -static void ssl_write_truncated_hmac_ext( mbedtls_ssl_context *ssl, - unsigned char *buf, - size_t *olen ) -{ - unsigned char *p = buf; - - if( ssl->session_negotiate->trunc_hmac == MBEDTLS_SSL_TRUNC_HMAC_DISABLED ) - { - *olen = 0; - return; - } - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, adding truncated hmac extension" ) ); - - *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_TRUNCATED_HMAC >> 8 ) & 0xFF ); - *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_TRUNCATED_HMAC ) & 0xFF ); - - *p++ = 0x00; - *p++ = 0x00; - - *olen = 4; -} -#endif /* MBEDTLS_SSL_TRUNCATED_HMAC */ - -#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID) -static void ssl_write_cid_ext( mbedtls_ssl_context *ssl, - unsigned char *buf, - size_t *olen ) -{ - unsigned char *p = buf; - size_t ext_len; - const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_OUT_CONTENT_LEN; - - *olen = 0; - - /* Skip writing the extension if we don't want to use it or if - * the client hasn't offered it. */ - if( ssl->handshake->cid_in_use == MBEDTLS_SSL_CID_DISABLED ) - return; - - /* ssl->own_cid_len is at most MBEDTLS_SSL_CID_IN_LEN_MAX - * which is at most 255, so the increment cannot overflow. */ - if( end < p || (size_t)( end - p ) < (unsigned)( ssl->own_cid_len + 5 ) ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small" ) ); - return; - } - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, adding CID extension" ) ); - - /* - * Quoting draft-ietf-tls-dtls-connection-id-05 - * https://tools.ietf.org/html/draft-ietf-tls-dtls-connection-id-05 - * - * struct { - * opaque cid<0..2^8-1>; - * } ConnectionId; - */ - - *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_CID >> 8 ) & 0xFF ); - *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_CID ) & 0xFF ); - ext_len = (size_t) ssl->own_cid_len + 1; - *p++ = (unsigned char)( ( ext_len >> 8 ) & 0xFF ); - *p++ = (unsigned char)( ( ext_len ) & 0xFF ); - - *p++ = (uint8_t) ssl->own_cid_len; - memcpy( p, ssl->own_cid, ssl->own_cid_len ); - - *olen = ssl->own_cid_len + 5; -} -#endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */ - -#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC) -static void ssl_write_encrypt_then_mac_ext( mbedtls_ssl_context *ssl, - unsigned char *buf, - size_t *olen ) -{ - unsigned char *p = buf; - const mbedtls_ssl_ciphersuite_t *suite = NULL; - const mbedtls_cipher_info_t *cipher = NULL; - - if( ssl->session_negotiate->encrypt_then_mac == MBEDTLS_SSL_ETM_DISABLED || - ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 ) - { - *olen = 0; - return; - } - - /* - * RFC 7366: "If a server receives an encrypt-then-MAC request extension - * from a client and then selects a stream or Authenticated Encryption - * with Associated Data (AEAD) ciphersuite, it MUST NOT send an - * encrypt-then-MAC response extension back to the client." - */ - if( ( suite = mbedtls_ssl_ciphersuite_from_id( - ssl->session_negotiate->ciphersuite ) ) == NULL || - ( cipher = mbedtls_cipher_info_from_type( suite->cipher ) ) == NULL || - cipher->mode != MBEDTLS_MODE_CBC ) - { - *olen = 0; - return; - } - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, adding encrypt then mac extension" ) ); - - *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_ENCRYPT_THEN_MAC >> 8 ) & 0xFF ); - *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_ENCRYPT_THEN_MAC ) & 0xFF ); - - *p++ = 0x00; - *p++ = 0x00; - - *olen = 4; -} -#endif /* MBEDTLS_SSL_ENCRYPT_THEN_MAC */ - -#if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET) -static void ssl_write_extended_ms_ext( mbedtls_ssl_context *ssl, - unsigned char *buf, - size_t *olen ) -{ - unsigned char *p = buf; - - if( ssl->handshake->extended_ms == MBEDTLS_SSL_EXTENDED_MS_DISABLED || - ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 ) - { - *olen = 0; - return; - } - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, adding extended master secret " - "extension" ) ); - - *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_EXTENDED_MASTER_SECRET >> 8 ) & 0xFF ); - *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_EXTENDED_MASTER_SECRET ) & 0xFF ); - - *p++ = 0x00; - *p++ = 0x00; - - *olen = 4; -} -#endif /* MBEDTLS_SSL_EXTENDED_MASTER_SECRET */ - -#if defined(MBEDTLS_SSL_SESSION_TICKETS) -static void ssl_write_session_ticket_ext( mbedtls_ssl_context *ssl, - unsigned char *buf, - size_t *olen ) -{ - unsigned char *p = buf; - - if( ssl->handshake->new_session_ticket == 0 ) - { - *olen = 0; - return; - } - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, adding session ticket extension" ) ); - - *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SESSION_TICKET >> 8 ) & 0xFF ); - *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SESSION_TICKET ) & 0xFF ); - - *p++ = 0x00; - *p++ = 0x00; - - *olen = 4; -} -#endif /* MBEDTLS_SSL_SESSION_TICKETS */ - -static void ssl_write_renegotiation_ext( mbedtls_ssl_context *ssl, - unsigned char *buf, - size_t *olen ) -{ - unsigned char *p = buf; - - if( ssl->secure_renegotiation != MBEDTLS_SSL_SECURE_RENEGOTIATION ) - { - *olen = 0; - return; - } - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, secure renegotiation extension" ) ); - - *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_RENEGOTIATION_INFO >> 8 ) & 0xFF ); - *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_RENEGOTIATION_INFO ) & 0xFF ); - -#if defined(MBEDTLS_SSL_RENEGOTIATION) - if( ssl->renego_status != MBEDTLS_SSL_INITIAL_HANDSHAKE ) - { - *p++ = 0x00; - *p++ = ( ssl->verify_data_len * 2 + 1 ) & 0xFF; - *p++ = ssl->verify_data_len * 2 & 0xFF; - - memcpy( p, ssl->peer_verify_data, ssl->verify_data_len ); - p += ssl->verify_data_len; - memcpy( p, ssl->own_verify_data, ssl->verify_data_len ); - p += ssl->verify_data_len; - } - else -#endif /* MBEDTLS_SSL_RENEGOTIATION */ - { - *p++ = 0x00; - *p++ = 0x01; - *p++ = 0x00; - } - - *olen = p - buf; -} - -#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH) -static void ssl_write_max_fragment_length_ext( mbedtls_ssl_context *ssl, - unsigned char *buf, - size_t *olen ) -{ - unsigned char *p = buf; - - if( ssl->session_negotiate->mfl_code == MBEDTLS_SSL_MAX_FRAG_LEN_NONE ) - { - *olen = 0; - return; - } - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, max_fragment_length extension" ) ); - - *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_MAX_FRAGMENT_LENGTH >> 8 ) & 0xFF ); - *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_MAX_FRAGMENT_LENGTH ) & 0xFF ); - - *p++ = 0x00; - *p++ = 1; - - *p++ = ssl->session_negotiate->mfl_code; - - *olen = 5; -} -#endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */ - -#if defined(MBEDTLS_ECDH_C) || defined(MBEDTLS_ECDSA_C) || \ - defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED) -static void ssl_write_supported_point_formats_ext( mbedtls_ssl_context *ssl, - unsigned char *buf, - size_t *olen ) -{ - unsigned char *p = buf; - ((void) ssl); - - if( ( ssl->handshake->cli_exts & - MBEDTLS_TLS_EXT_SUPPORTED_POINT_FORMATS_PRESENT ) == 0 ) - { - *olen = 0; - return; - } - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, supported_point_formats extension" ) ); - - *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SUPPORTED_POINT_FORMATS >> 8 ) & 0xFF ); - *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SUPPORTED_POINT_FORMATS ) & 0xFF ); - - *p++ = 0x00; - *p++ = 2; - - *p++ = 1; - *p++ = MBEDTLS_ECP_PF_UNCOMPRESSED; - - *olen = 6; -} -#endif /* MBEDTLS_ECDH_C || MBEDTLS_ECDSA_C || MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */ - -#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED) -static void ssl_write_ecjpake_kkpp_ext( mbedtls_ssl_context *ssl, - unsigned char *buf, - size_t *olen ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - unsigned char *p = buf; - const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_OUT_CONTENT_LEN; - size_t kkpp_len; - - *olen = 0; - - /* Skip costly computation if not needed */ - if( ssl->handshake->ciphersuite_info->key_exchange != - MBEDTLS_KEY_EXCHANGE_ECJPAKE ) - return; - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, ecjpake kkpp extension" ) ); - - if( end - p < 4 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small" ) ); - return; - } - - *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_ECJPAKE_KKPP >> 8 ) & 0xFF ); - *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_ECJPAKE_KKPP ) & 0xFF ); - - ret = mbedtls_ecjpake_write_round_one( &ssl->handshake->ecjpake_ctx, - p + 2, end - p - 2, &kkpp_len, - ssl->conf->f_rng, ssl->conf->p_rng ); - if( ret != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1 , "mbedtls_ecjpake_write_round_one", ret ); - return; - } - - *p++ = (unsigned char)( ( kkpp_len >> 8 ) & 0xFF ); - *p++ = (unsigned char)( ( kkpp_len ) & 0xFF ); - - *olen = kkpp_len + 4; -} -#endif /* MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */ - -#if defined(MBEDTLS_SSL_ALPN ) -static void ssl_write_alpn_ext( mbedtls_ssl_context *ssl, - unsigned char *buf, size_t *olen ) -{ - if( ssl->alpn_chosen == NULL ) - { - *olen = 0; - return; - } - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, adding alpn extension" ) ); - - /* - * 0 . 1 ext identifier - * 2 . 3 ext length - * 4 . 5 protocol list length - * 6 . 6 protocol name length - * 7 . 7+n protocol name - */ - buf[0] = (unsigned char)( ( MBEDTLS_TLS_EXT_ALPN >> 8 ) & 0xFF ); - buf[1] = (unsigned char)( ( MBEDTLS_TLS_EXT_ALPN ) & 0xFF ); - - *olen = 7 + strlen( ssl->alpn_chosen ); - - buf[2] = (unsigned char)( ( ( *olen - 4 ) >> 8 ) & 0xFF ); - buf[3] = (unsigned char)( ( ( *olen - 4 ) ) & 0xFF ); - - buf[4] = (unsigned char)( ( ( *olen - 6 ) >> 8 ) & 0xFF ); - buf[5] = (unsigned char)( ( ( *olen - 6 ) ) & 0xFF ); - - buf[6] = (unsigned char)( ( ( *olen - 7 ) ) & 0xFF ); - - memcpy( buf + 7, ssl->alpn_chosen, *olen - 7 ); -} -#endif /* MBEDTLS_ECDH_C || MBEDTLS_ECDSA_C */ - -#if defined(MBEDTLS_SSL_DTLS_SRTP ) && defined(MBEDTLS_SSL_PROTO_DTLS) -static void ssl_write_use_srtp_ext( mbedtls_ssl_context *ssl, - unsigned char *buf, - size_t *olen ) -{ - size_t mki_len = 0, ext_len = 0; - uint16_t profile_value = 0; - const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_OUT_CONTENT_LEN; - - *olen = 0; - - if( ( ssl->conf->transport != MBEDTLS_SSL_TRANSPORT_DATAGRAM ) || - ( ssl->dtls_srtp_info.chosen_dtls_srtp_profile == MBEDTLS_TLS_SRTP_UNSET ) ) - { - return; - } - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, adding use_srtp extension" ) ); - - if( ssl->conf->dtls_srtp_mki_support == MBEDTLS_SSL_DTLS_SRTP_MKI_SUPPORTED ) - { - mki_len = ssl->dtls_srtp_info.mki_len; - } - - /* The extension total size is 9 bytes : - * - 2 bytes for the extension tag - * - 2 bytes for the total size - * - 2 bytes for the protection profile length - * - 2 bytes for the protection profile - * - 1 byte for the mki length - * + the actual mki length - * Check we have enough room in the output buffer */ - if( (size_t)( end - buf ) < mki_len + 9 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small" ) ); - return; - } - - /* extension */ - buf[0] = (unsigned char)( ( MBEDTLS_TLS_EXT_USE_SRTP >> 8 ) & 0xFF ); - buf[1] = (unsigned char)( ( MBEDTLS_TLS_EXT_USE_SRTP ) & 0xFF ); - /* - * total length 5 and mki value: only one profile(2 bytes) - * and length(2 bytes) and srtp_mki ) - */ - ext_len = 5 + mki_len; - buf[2] = (unsigned char)( ( ext_len >> 8 ) & 0xFF ); - buf[3] = (unsigned char)( ext_len & 0xFF ); - - /* protection profile length: 2 */ - buf[4] = 0x00; - buf[5] = 0x02; - profile_value = mbedtls_ssl_check_srtp_profile_value( - ssl->dtls_srtp_info.chosen_dtls_srtp_profile ); - if( profile_value != MBEDTLS_TLS_SRTP_UNSET ) - { - buf[6] = (unsigned char)( ( profile_value >> 8 ) & 0xFF ); - buf[7] = (unsigned char)( profile_value & 0xFF ); - } - else - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "use_srtp extension invalid profile" ) ); - return; - } - - buf[8] = mki_len & 0xFF; - memcpy( &buf[9], ssl->dtls_srtp_info.mki_value, mki_len ); - - *olen = 9 + mki_len; -} -#endif /* MBEDTLS_SSL_DTLS_SRTP */ - -#if defined(MBEDTLS_SSL_DTLS_HELLO_VERIFY) -static int ssl_write_hello_verify_request( mbedtls_ssl_context *ssl ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - unsigned char *p = ssl->out_msg + 4; - unsigned char *cookie_len_byte; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write hello verify request" ) ); - - /* - * struct { - * ProtocolVersion server_version; - * opaque cookie<0..2^8-1>; - * } HelloVerifyRequest; - */ - - /* The RFC is not clear on this point, but sending the actual negotiated - * version looks like the most interoperable thing to do. */ - mbedtls_ssl_write_version( ssl->major_ver, ssl->minor_ver, - ssl->conf->transport, p ); - MBEDTLS_SSL_DEBUG_BUF( 3, "server version", p, 2 ); - p += 2; - - /* If we get here, f_cookie_check is not null */ - if( ssl->conf->f_cookie_write == NULL ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "inconsistent cookie callbacks" ) ); - return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); - } - - /* Skip length byte until we know the length */ - cookie_len_byte = p++; - - if( ( ret = ssl->conf->f_cookie_write( ssl->conf->p_cookie, - &p, ssl->out_buf + MBEDTLS_SSL_OUT_BUFFER_LEN, - ssl->cli_id, ssl->cli_id_len ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "f_cookie_write", ret ); - return( ret ); - } - - *cookie_len_byte = (unsigned char)( p - ( cookie_len_byte + 1 ) ); - - MBEDTLS_SSL_DEBUG_BUF( 3, "cookie sent", cookie_len_byte + 1, *cookie_len_byte ); - - ssl->out_msglen = p - ssl->out_msg; - ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE; - ssl->out_msg[0] = MBEDTLS_SSL_HS_HELLO_VERIFY_REQUEST; - - ssl->state = MBEDTLS_SSL_SERVER_HELLO_VERIFY_REQUEST_SENT; - - if( ( ret = mbedtls_ssl_write_handshake_msg( ssl ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_handshake_msg", ret ); - return( ret ); - } - -#if defined(MBEDTLS_SSL_PROTO_DTLS) - if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM && - ( ret = mbedtls_ssl_flight_transmit( ssl ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_flight_transmit", ret ); - return( ret ); - } -#endif /* MBEDTLS_SSL_PROTO_DTLS */ - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write hello verify request" ) ); - - return( 0 ); -} -#endif /* MBEDTLS_SSL_DTLS_HELLO_VERIFY */ - -static void ssl_handle_id_based_session_resumption( mbedtls_ssl_context *ssl ) -{ - int ret; - mbedtls_ssl_session session_tmp; - mbedtls_ssl_session * const session = ssl->session_negotiate; - - /* Resume is 0 by default, see ssl_handshake_init(). - * It may be already set to 1 by ssl_parse_session_ticket_ext(). */ - if( ssl->handshake->resume == 1 ) - return; - if( session->id_len == 0 ) - return; - if( ssl->conf->f_get_cache == NULL ) - return; -#if defined(MBEDTLS_SSL_RENEGOTIATION) - if( ssl->renego_status != MBEDTLS_SSL_INITIAL_HANDSHAKE ) - return; -#endif - - mbedtls_ssl_session_init( &session_tmp ); - - session_tmp.id_len = session->id_len; - memcpy( session_tmp.id, session->id, session->id_len ); - - ret = ssl->conf->f_get_cache( ssl->conf->p_cache, - &session_tmp ); - if( ret != 0 ) - goto exit; - - if( session->ciphersuite != session_tmp.ciphersuite || - session->compression != session_tmp.compression ) - { - /* Mismatch between cached and negotiated session */ - goto exit; - } - - /* Move semantics */ - mbedtls_ssl_session_free( session ); - *session = session_tmp; - memset( &session_tmp, 0, sizeof( session_tmp ) ); - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "session successfully restored from cache" ) ); - ssl->handshake->resume = 1; - -exit: - - mbedtls_ssl_session_free( &session_tmp ); -} - -static int ssl_write_server_hello( mbedtls_ssl_context *ssl ) -{ -#if defined(MBEDTLS_HAVE_TIME) - mbedtls_time_t t; -#endif - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - size_t olen, ext_len = 0, n; - unsigned char *buf, *p; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write server hello" ) ); - -#if defined(MBEDTLS_SSL_DTLS_HELLO_VERIFY) - if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM && - ssl->handshake->verify_cookie_len != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "client hello was not authenticated" ) ); - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write server hello" ) ); - - return( ssl_write_hello_verify_request( ssl ) ); - } -#endif /* MBEDTLS_SSL_DTLS_HELLO_VERIFY */ - - if( ssl->conf->f_rng == NULL ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "no RNG provided") ); - return( MBEDTLS_ERR_SSL_NO_RNG ); - } - - /* - * 0 . 0 handshake type - * 1 . 3 handshake length - * 4 . 5 protocol version - * 6 . 9 UNIX time() - * 10 . 37 random bytes - */ - buf = ssl->out_msg; - p = buf + 4; - - mbedtls_ssl_write_version( ssl->major_ver, ssl->minor_ver, - ssl->conf->transport, p ); - p += 2; - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, chosen version: [%d:%d]", - buf[4], buf[5] ) ); - -#if defined(MBEDTLS_HAVE_TIME) - t = mbedtls_time( NULL ); - *p++ = (unsigned char)( t >> 24 ); - *p++ = (unsigned char)( t >> 16 ); - *p++ = (unsigned char)( t >> 8 ); - *p++ = (unsigned char)( t ); - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, current time: %" MBEDTLS_PRINTF_LONGLONG, - (long long) t ) ); -#else - if( ( ret = ssl->conf->f_rng( ssl->conf->p_rng, p, 4 ) ) != 0 ) - return( ret ); - - p += 4; -#endif /* MBEDTLS_HAVE_TIME */ - - if( ( ret = ssl->conf->f_rng( ssl->conf->p_rng, p, 28 ) ) != 0 ) - return( ret ); - - p += 28; - - memcpy( ssl->handshake->randbytes + 32, buf + 6, 32 ); - - MBEDTLS_SSL_DEBUG_BUF( 3, "server hello, random bytes", buf + 6, 32 ); - - ssl_handle_id_based_session_resumption( ssl ); - - if( ssl->handshake->resume == 0 ) - { - /* - * New session, create a new session id, - * unless we're about to issue a session ticket - */ - ssl->state++; - -#if defined(MBEDTLS_HAVE_TIME) - ssl->session_negotiate->start = mbedtls_time( NULL ); -#endif - -#if defined(MBEDTLS_SSL_SESSION_TICKETS) - if( ssl->handshake->new_session_ticket != 0 ) - { - ssl->session_negotiate->id_len = n = 0; - memset( ssl->session_negotiate->id, 0, 32 ); - } - else -#endif /* MBEDTLS_SSL_SESSION_TICKETS */ - { - ssl->session_negotiate->id_len = n = 32; - if( ( ret = ssl->conf->f_rng( ssl->conf->p_rng, ssl->session_negotiate->id, - n ) ) != 0 ) - return( ret ); - } - } - else - { - /* - * Resuming a session - */ - n = ssl->session_negotiate->id_len; - ssl->state = MBEDTLS_SSL_SERVER_CHANGE_CIPHER_SPEC; - - if( ( ret = mbedtls_ssl_derive_keys( ssl ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_derive_keys", ret ); - return( ret ); - } - } - - /* - * 38 . 38 session id length - * 39 . 38+n session id - * 39+n . 40+n chosen ciphersuite - * 41+n . 41+n chosen compression alg. - * 42+n . 43+n extensions length - * 44+n . 43+n+m extensions - */ - *p++ = (unsigned char) ssl->session_negotiate->id_len; - memcpy( p, ssl->session_negotiate->id, ssl->session_negotiate->id_len ); - p += ssl->session_negotiate->id_len; - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, session id len.: %" MBEDTLS_PRINTF_SIZET, n ) ); - MBEDTLS_SSL_DEBUG_BUF( 3, "server hello, session id", buf + 39, n ); - MBEDTLS_SSL_DEBUG_MSG( 3, ( "%s session has been resumed", - ssl->handshake->resume ? "a" : "no" ) ); - - *p++ = (unsigned char)( ssl->session_negotiate->ciphersuite >> 8 ); - *p++ = (unsigned char)( ssl->session_negotiate->ciphersuite ); - *p++ = (unsigned char)( ssl->session_negotiate->compression ); - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, chosen ciphersuite: %s", - mbedtls_ssl_get_ciphersuite_name( ssl->session_negotiate->ciphersuite ) ) ); - MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, compress alg.: 0x%02X", - (unsigned int) ssl->session_negotiate->compression ) ); - - /* Do not write the extensions if the protocol is SSLv3 */ -#if defined(MBEDTLS_SSL_PROTO_SSL3) - if( ( ssl->major_ver != 3 ) || ( ssl->minor_ver != 0 ) ) - { -#endif - - /* - * First write extensions, then the total length - */ - ssl_write_renegotiation_ext( ssl, p + 2 + ext_len, &olen ); - ext_len += olen; - -#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH) - ssl_write_max_fragment_length_ext( ssl, p + 2 + ext_len, &olen ); - ext_len += olen; -#endif - -#if defined(MBEDTLS_SSL_TRUNCATED_HMAC) - ssl_write_truncated_hmac_ext( ssl, p + 2 + ext_len, &olen ); - ext_len += olen; -#endif - -#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID) - ssl_write_cid_ext( ssl, p + 2 + ext_len, &olen ); - ext_len += olen; -#endif - -#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC) - ssl_write_encrypt_then_mac_ext( ssl, p + 2 + ext_len, &olen ); - ext_len += olen; -#endif - -#if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET) - ssl_write_extended_ms_ext( ssl, p + 2 + ext_len, &olen ); - ext_len += olen; -#endif - -#if defined(MBEDTLS_SSL_SESSION_TICKETS) - ssl_write_session_ticket_ext( ssl, p + 2 + ext_len, &olen ); - ext_len += olen; -#endif - -#if defined(MBEDTLS_ECDH_C) || defined(MBEDTLS_ECDSA_C) || \ - defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED) - if ( mbedtls_ssl_ciphersuite_uses_ec( - mbedtls_ssl_ciphersuite_from_id( ssl->session_negotiate->ciphersuite ) ) ) - { - ssl_write_supported_point_formats_ext( ssl, p + 2 + ext_len, &olen ); - ext_len += olen; - } -#endif - -#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED) - ssl_write_ecjpake_kkpp_ext( ssl, p + 2 + ext_len, &olen ); - ext_len += olen; -#endif - -#if defined(MBEDTLS_SSL_ALPN) - ssl_write_alpn_ext( ssl, p + 2 + ext_len, &olen ); - ext_len += olen; -#endif - -#if defined(MBEDTLS_SSL_DTLS_SRTP) - ssl_write_use_srtp_ext( ssl, p + 2 + ext_len, &olen ); - ext_len += olen; -#endif - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, total extension length: %" MBEDTLS_PRINTF_SIZET, - ext_len ) ); - - if( ext_len > 0 ) - { - *p++ = (unsigned char)( ( ext_len >> 8 ) & 0xFF ); - *p++ = (unsigned char)( ( ext_len ) & 0xFF ); - p += ext_len; - } - -#if defined(MBEDTLS_SSL_PROTO_SSL3) - } -#endif - - ssl->out_msglen = p - buf; - ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE; - ssl->out_msg[0] = MBEDTLS_SSL_HS_SERVER_HELLO; - - ret = mbedtls_ssl_write_handshake_msg( ssl ); - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write server hello" ) ); - - return( ret ); -} - -#if !defined(MBEDTLS_KEY_EXCHANGE_CERT_REQ_ALLOWED_ENABLED) -static int ssl_write_certificate_request( mbedtls_ssl_context *ssl ) -{ - const mbedtls_ssl_ciphersuite_t *ciphersuite_info = - ssl->handshake->ciphersuite_info; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write certificate request" ) ); - - if( !mbedtls_ssl_ciphersuite_cert_req_allowed( ciphersuite_info ) ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip write certificate request" ) ); - ssl->state++; - return( 0 ); - } - - MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); - return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); -} -#else /* !MBEDTLS_KEY_EXCHANGE_CERT_REQ_ALLOWED_ENABLED */ -static int ssl_write_certificate_request( mbedtls_ssl_context *ssl ) -{ - int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE; - const mbedtls_ssl_ciphersuite_t *ciphersuite_info = - ssl->handshake->ciphersuite_info; - uint16_t dn_size, total_dn_size; /* excluding length bytes */ - size_t ct_len, sa_len; /* including length bytes */ - unsigned char *buf, *p; - const unsigned char * const end = ssl->out_msg + MBEDTLS_SSL_OUT_CONTENT_LEN; - const mbedtls_x509_crt *crt; - int authmode; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write certificate request" ) ); - - ssl->state++; - -#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION) - if( ssl->handshake->sni_authmode != MBEDTLS_SSL_VERIFY_UNSET ) - authmode = ssl->handshake->sni_authmode; - else -#endif - authmode = ssl->conf->authmode; - - if( !mbedtls_ssl_ciphersuite_cert_req_allowed( ciphersuite_info ) || - authmode == MBEDTLS_SSL_VERIFY_NONE ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip write certificate request" ) ); - return( 0 ); - } - - /* - * 0 . 0 handshake type - * 1 . 3 handshake length - * 4 . 4 cert type count - * 5 .. m-1 cert types - * m .. m+1 sig alg length (TLS 1.2 only) - * m+1 .. n-1 SignatureAndHashAlgorithms (TLS 1.2 only) - * n .. n+1 length of all DNs - * n+2 .. n+3 length of DN 1 - * n+4 .. ... Distinguished Name #1 - * ... .. ... length of DN 2, etc. - */ - buf = ssl->out_msg; - p = buf + 4; - - /* - * Supported certificate types - * - * ClientCertificateType certificate_types<1..2^8-1>; - * enum { (255) } ClientCertificateType; - */ - ct_len = 0; - -#if defined(MBEDTLS_RSA_C) - p[1 + ct_len++] = MBEDTLS_SSL_CERT_TYPE_RSA_SIGN; -#endif -#if defined(MBEDTLS_ECDSA_C) - p[1 + ct_len++] = MBEDTLS_SSL_CERT_TYPE_ECDSA_SIGN; -#endif - - p[0] = (unsigned char) ct_len++; - p += ct_len; - - sa_len = 0; -#if defined(MBEDTLS_SSL_PROTO_TLS1_2) - /* - * Add signature_algorithms for verify (TLS 1.2) - * - * SignatureAndHashAlgorithm supported_signature_algorithms<2..2^16-2>; - * - * struct { - * HashAlgorithm hash; - * SignatureAlgorithm signature; - * } SignatureAndHashAlgorithm; - * - * enum { (255) } HashAlgorithm; - * enum { (255) } SignatureAlgorithm; - */ - if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 ) - { - const int *cur; - - /* - * Supported signature algorithms - */ - for( cur = ssl->conf->sig_hashes; *cur != MBEDTLS_MD_NONE; cur++ ) - { - unsigned char hash = mbedtls_ssl_hash_from_md_alg( *cur ); - - if( MBEDTLS_SSL_HASH_NONE == hash || mbedtls_ssl_set_calc_verify_md( ssl, hash ) ) - continue; - -#if defined(MBEDTLS_RSA_C) - p[2 + sa_len++] = hash; - p[2 + sa_len++] = MBEDTLS_SSL_SIG_RSA; -#endif -#if defined(MBEDTLS_ECDSA_C) - p[2 + sa_len++] = hash; - p[2 + sa_len++] = MBEDTLS_SSL_SIG_ECDSA; -#endif - } - - p[0] = (unsigned char)( sa_len >> 8 ); - p[1] = (unsigned char)( sa_len ); - sa_len += 2; - p += sa_len; - } -#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ - - /* - * DistinguishedName certificate_authorities<0..2^16-1>; - * opaque DistinguishedName<1..2^16-1>; - */ - p += 2; - - total_dn_size = 0; - - if( ssl->conf->cert_req_ca_list == MBEDTLS_SSL_CERT_REQ_CA_LIST_ENABLED ) - { - /* NOTE: If trusted certificates are provisioned - * via a CA callback (configured through - * `mbedtls_ssl_conf_ca_cb()`, then the - * CertificateRequest is currently left empty. */ - -#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION) - if( ssl->handshake->sni_ca_chain != NULL ) - crt = ssl->handshake->sni_ca_chain; - else -#endif - crt = ssl->conf->ca_chain; - - while( crt != NULL && crt->version != 0 ) - { - /* It follows from RFC 5280 A.1 that this length - * can be represented in at most 11 bits. */ - dn_size = (uint16_t) crt->subject_raw.len; - - if( end < p || (size_t)( end - p ) < 2 + (size_t) dn_size ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "skipping CAs: buffer too short" ) ); - break; - } - - *p++ = (unsigned char)( dn_size >> 8 ); - *p++ = (unsigned char)( dn_size ); - memcpy( p, crt->subject_raw.p, dn_size ); - p += dn_size; - - MBEDTLS_SSL_DEBUG_BUF( 3, "requested DN", p - dn_size, dn_size ); - - total_dn_size += 2 + dn_size; - crt = crt->next; - } - } - - ssl->out_msglen = p - buf; - ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE; - ssl->out_msg[0] = MBEDTLS_SSL_HS_CERTIFICATE_REQUEST; - ssl->out_msg[4 + ct_len + sa_len] = (unsigned char)( total_dn_size >> 8 ); - ssl->out_msg[5 + ct_len + sa_len] = (unsigned char)( total_dn_size ); - - ret = mbedtls_ssl_write_handshake_msg( ssl ); - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write certificate request" ) ); - - return( ret ); -} -#endif /* MBEDTLS_KEY_EXCHANGE_CERT_REQ_ALLOWED_ENABLED */ - -#if defined(MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED) || \ - defined(MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED) -static int ssl_get_ecdh_params_from_cert( mbedtls_ssl_context *ssl ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - - if( ! mbedtls_pk_can_do( mbedtls_ssl_own_key( ssl ), MBEDTLS_PK_ECKEY ) ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "server key not ECDH capable" ) ); - return( MBEDTLS_ERR_SSL_PK_TYPE_MISMATCH ); - } - - if( ( ret = mbedtls_ecdh_get_params( &ssl->handshake->ecdh_ctx, - mbedtls_pk_ec( *mbedtls_ssl_own_key( ssl ) ), - MBEDTLS_ECDH_OURS ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, ( "mbedtls_ecdh_get_params" ), ret ); - return( ret ); - } - - return( 0 ); -} -#endif /* MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED) || - MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED */ - -#if defined(MBEDTLS_KEY_EXCHANGE_WITH_SERVER_SIGNATURE_ENABLED) && \ - defined(MBEDTLS_SSL_ASYNC_PRIVATE) -static int ssl_resume_server_key_exchange( mbedtls_ssl_context *ssl, - size_t *signature_len ) -{ - /* Append the signature to ssl->out_msg, leaving 2 bytes for the - * signature length which will be added in ssl_write_server_key_exchange - * after the call to ssl_prepare_server_key_exchange. - * ssl_write_server_key_exchange also takes care of incrementing - * ssl->out_msglen. */ - unsigned char *sig_start = ssl->out_msg + ssl->out_msglen + 2; - size_t sig_max_len = ( ssl->out_buf + MBEDTLS_SSL_OUT_CONTENT_LEN - - sig_start ); - int ret = ssl->conf->f_async_resume( ssl, - sig_start, signature_len, sig_max_len ); - if( ret != MBEDTLS_ERR_SSL_ASYNC_IN_PROGRESS ) - { - ssl->handshake->async_in_progress = 0; - mbedtls_ssl_set_async_operation_data( ssl, NULL ); - } - MBEDTLS_SSL_DEBUG_RET( 2, "ssl_resume_server_key_exchange", ret ); - return( ret ); -} -#endif /* defined(MBEDTLS_KEY_EXCHANGE_WITH_SERVER_SIGNATURE_ENABLED) && - defined(MBEDTLS_SSL_ASYNC_PRIVATE) */ - -/* Prepare the ServerKeyExchange message, up to and including - * calculating the signature if any, but excluding formatting the - * signature and sending the message. */ -static int ssl_prepare_server_key_exchange( mbedtls_ssl_context *ssl, - size_t *signature_len ) -{ - const mbedtls_ssl_ciphersuite_t *ciphersuite_info = - ssl->handshake->ciphersuite_info; - -#if defined(MBEDTLS_KEY_EXCHANGE_SOME_PFS_ENABLED) -#if defined(MBEDTLS_KEY_EXCHANGE_WITH_SERVER_SIGNATURE_ENABLED) - unsigned char *dig_signed = NULL; -#endif /* MBEDTLS_KEY_EXCHANGE_WITH_SERVER_SIGNATURE_ENABLED */ -#endif /* MBEDTLS_KEY_EXCHANGE_SOME_PFS_ENABLED */ - - (void) ciphersuite_info; /* unused in some configurations */ -#if !defined(MBEDTLS_KEY_EXCHANGE_WITH_SERVER_SIGNATURE_ENABLED) - (void) signature_len; -#endif /* MBEDTLS_KEY_EXCHANGE_WITH_SERVER_SIGNATURE_ENABLED */ - - ssl->out_msglen = 4; /* header (type:1, length:3) to be written later */ - - /* - * - * Part 1: Provide key exchange parameters for chosen ciphersuite. - * - */ - - /* - * - ECJPAKE key exchanges - */ -#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED) - if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECJPAKE ) - { - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - size_t len = 0; - - ret = mbedtls_ecjpake_write_round_two( - &ssl->handshake->ecjpake_ctx, - ssl->out_msg + ssl->out_msglen, - MBEDTLS_SSL_OUT_CONTENT_LEN - ssl->out_msglen, &len, - ssl->conf->f_rng, ssl->conf->p_rng ); - if( ret != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecjpake_write_round_two", ret ); - return( ret ); - } - - ssl->out_msglen += len; - } -#endif /* MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */ - - /* - * For (EC)DHE key exchanges with PSK, parameters are prefixed by support - * identity hint (RFC 4279, Sec. 3). Until someone needs this feature, - * we use empty support identity hints here. - **/ -#if defined(MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED) || \ - defined(MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED) - if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_PSK || - ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_PSK ) - { - ssl->out_msg[ssl->out_msglen++] = 0x00; - ssl->out_msg[ssl->out_msglen++] = 0x00; - } -#endif /* MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED || - MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED */ - - /* - * - DHE key exchanges - */ -#if defined(MBEDTLS_KEY_EXCHANGE_SOME_DHE_ENABLED) - if( mbedtls_ssl_ciphersuite_uses_dhe( ciphersuite_info ) ) - { - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - size_t len = 0; - - if( ssl->conf->dhm_P.p == NULL || ssl->conf->dhm_G.p == NULL ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "no DH parameters set" ) ); - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - } - - /* - * Ephemeral DH parameters: - * - * struct { - * opaque dh_p<1..2^16-1>; - * opaque dh_g<1..2^16-1>; - * opaque dh_Ys<1..2^16-1>; - * } ServerDHParams; - */ - if( ( ret = mbedtls_dhm_set_group( &ssl->handshake->dhm_ctx, - &ssl->conf->dhm_P, - &ssl->conf->dhm_G ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_dhm_set_group", ret ); - return( ret ); - } - - if( ( ret = mbedtls_dhm_make_params( - &ssl->handshake->dhm_ctx, - (int) mbedtls_mpi_size( &ssl->handshake->dhm_ctx.P ), - ssl->out_msg + ssl->out_msglen, &len, - ssl->conf->f_rng, ssl->conf->p_rng ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_dhm_make_params", ret ); - return( ret ); - } - -#if defined(MBEDTLS_KEY_EXCHANGE_WITH_SERVER_SIGNATURE_ENABLED) - dig_signed = ssl->out_msg + ssl->out_msglen; -#endif - - ssl->out_msglen += len; - - MBEDTLS_SSL_DEBUG_MPI( 3, "DHM: X ", &ssl->handshake->dhm_ctx.X ); - MBEDTLS_SSL_DEBUG_MPI( 3, "DHM: P ", &ssl->handshake->dhm_ctx.P ); - MBEDTLS_SSL_DEBUG_MPI( 3, "DHM: G ", &ssl->handshake->dhm_ctx.G ); - MBEDTLS_SSL_DEBUG_MPI( 3, "DHM: GX", &ssl->handshake->dhm_ctx.GX ); - } -#endif /* MBEDTLS_KEY_EXCHANGE_SOME_DHE_ENABLED */ - - /* - * - ECDHE key exchanges - */ -#if defined(MBEDTLS_KEY_EXCHANGE_SOME_ECDHE_ENABLED) - if( mbedtls_ssl_ciphersuite_uses_ecdhe( ciphersuite_info ) ) - { - /* - * Ephemeral ECDH parameters: - * - * struct { - * ECParameters curve_params; - * ECPoint public; - * } ServerECDHParams; - */ - const mbedtls_ecp_curve_info **curve = NULL; - const mbedtls_ecp_group_id *gid; - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - size_t len = 0; - - /* Match our preference list against the offered curves */ - for( gid = ssl->conf->curve_list; *gid != MBEDTLS_ECP_DP_NONE; gid++ ) - for( curve = ssl->handshake->curves; *curve != NULL; curve++ ) - if( (*curve)->grp_id == *gid ) - goto curve_matching_done; - -curve_matching_done: - if( curve == NULL || *curve == NULL ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "no matching curve for ECDHE" ) ); - return( MBEDTLS_ERR_SSL_NO_CIPHER_CHOSEN ); - } - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "ECDHE curve: %s", (*curve)->name ) ); - - if( ( ret = mbedtls_ecdh_setup( &ssl->handshake->ecdh_ctx, - (*curve)->grp_id ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecp_group_load", ret ); - return( ret ); - } - - if( ( ret = mbedtls_ecdh_make_params( - &ssl->handshake->ecdh_ctx, &len, - ssl->out_msg + ssl->out_msglen, - MBEDTLS_SSL_OUT_CONTENT_LEN - ssl->out_msglen, - ssl->conf->f_rng, ssl->conf->p_rng ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecdh_make_params", ret ); - return( ret ); - } - -#if defined(MBEDTLS_KEY_EXCHANGE_WITH_SERVER_SIGNATURE_ENABLED) - dig_signed = ssl->out_msg + ssl->out_msglen; -#endif - - ssl->out_msglen += len; - - MBEDTLS_SSL_DEBUG_ECDH( 3, &ssl->handshake->ecdh_ctx, - MBEDTLS_DEBUG_ECDH_Q ); - } -#endif /* MBEDTLS_KEY_EXCHANGE_SOME_ECDHE_ENABLED */ - - /* - * - * Part 2: For key exchanges involving the server signing the - * exchange parameters, compute and add the signature here. - * - */ -#if defined(MBEDTLS_KEY_EXCHANGE_WITH_SERVER_SIGNATURE_ENABLED) - if( mbedtls_ssl_ciphersuite_uses_server_signature( ciphersuite_info ) ) - { - size_t dig_signed_len = ssl->out_msg + ssl->out_msglen - dig_signed; - size_t hashlen = 0; - unsigned char hash[MBEDTLS_MD_MAX_SIZE]; - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - - /* - * 2.1: Choose hash algorithm: - * A: For TLS 1.2, obey signature-hash-algorithm extension - * to choose appropriate hash. - * B: For SSL3, TLS1.0, TLS1.1 and ECDHE_ECDSA, use SHA1 - * (RFC 4492, Sec. 5.4) - * C: Otherwise, use MD5 + SHA1 (RFC 4346, Sec. 7.4.3) - */ - - mbedtls_md_type_t md_alg; - -#if defined(MBEDTLS_SSL_PROTO_TLS1_2) - mbedtls_pk_type_t sig_alg = - mbedtls_ssl_get_ciphersuite_sig_pk_alg( ciphersuite_info ); - if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 ) - { - /* A: For TLS 1.2, obey signature-hash-algorithm extension - * (RFC 5246, Sec. 7.4.1.4.1). */ - if( sig_alg == MBEDTLS_PK_NONE || - ( md_alg = mbedtls_ssl_sig_hash_set_find( &ssl->handshake->hash_algs, - sig_alg ) ) == MBEDTLS_MD_NONE ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); - /* (... because we choose a cipher suite - * only if there is a matching hash.) */ - return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); - } - } - else -#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ -#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \ - defined(MBEDTLS_SSL_PROTO_TLS1_1) - if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA ) - { - /* B: Default hash SHA1 */ - md_alg = MBEDTLS_MD_SHA1; - } - else -#endif /* MBEDTLS_SSL_PROTO_SSL3 || MBEDTLS_SSL_PROTO_TLS1 || \ - MBEDTLS_SSL_PROTO_TLS1_1 */ - { - /* C: MD5 + SHA1 */ - md_alg = MBEDTLS_MD_NONE; - } - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "pick hash algorithm %u for signing", (unsigned) md_alg ) ); - - /* - * 2.2: Compute the hash to be signed - */ -#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \ - defined(MBEDTLS_SSL_PROTO_TLS1_1) - if( md_alg == MBEDTLS_MD_NONE ) - { - hashlen = 36; - ret = mbedtls_ssl_get_key_exchange_md_ssl_tls( ssl, hash, - dig_signed, - dig_signed_len ); - if( ret != 0 ) - return( ret ); - } - else -#endif /* MBEDTLS_SSL_PROTO_SSL3 || MBEDTLS_SSL_PROTO_TLS1 || \ - MBEDTLS_SSL_PROTO_TLS1_1 */ -#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) || \ - defined(MBEDTLS_SSL_PROTO_TLS1_2) - if( md_alg != MBEDTLS_MD_NONE ) - { - ret = mbedtls_ssl_get_key_exchange_md_tls1_2( ssl, hash, &hashlen, - dig_signed, - dig_signed_len, - md_alg ); - if( ret != 0 ) - return( ret ); - } - else -#endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 || \ - MBEDTLS_SSL_PROTO_TLS1_2 */ - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); - return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); - } - - MBEDTLS_SSL_DEBUG_BUF( 3, "parameters hash", hash, hashlen ); - - /* - * 2.3: Compute and add the signature - */ -#if defined(MBEDTLS_SSL_PROTO_TLS1_2) - if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 ) - { - /* - * For TLS 1.2, we need to specify signature and hash algorithm - * explicitly through a prefix to the signature. - * - * struct { - * HashAlgorithm hash; - * SignatureAlgorithm signature; - * } SignatureAndHashAlgorithm; - * - * struct { - * SignatureAndHashAlgorithm algorithm; - * opaque signature<0..2^16-1>; - * } DigitallySigned; - * - */ - - ssl->out_msg[ssl->out_msglen++] = - 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 */ - -#if defined(MBEDTLS_SSL_ASYNC_PRIVATE) - if( ssl->conf->f_async_sign_start != NULL ) - { - ret = ssl->conf->f_async_sign_start( ssl, - mbedtls_ssl_own_cert( ssl ), - md_alg, hash, hashlen ); - switch( ret ) - { - case MBEDTLS_ERR_SSL_HW_ACCEL_FALLTHROUGH: - /* act as if f_async_sign was null */ - break; - case 0: - ssl->handshake->async_in_progress = 1; - return( ssl_resume_server_key_exchange( ssl, signature_len ) ); - case MBEDTLS_ERR_SSL_ASYNC_IN_PROGRESS: - ssl->handshake->async_in_progress = 1; - return( MBEDTLS_ERR_SSL_ASYNC_IN_PROGRESS ); - default: - MBEDTLS_SSL_DEBUG_RET( 1, "f_async_sign_start", ret ); - return( ret ); - } - } -#endif /* MBEDTLS_SSL_ASYNC_PRIVATE */ - - if( mbedtls_ssl_own_key( ssl ) == NULL ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "got no private key" ) ); - return( MBEDTLS_ERR_SSL_PRIVATE_KEY_REQUIRED ); - } - - /* Append the signature to ssl->out_msg, leaving 2 bytes for the - * signature length which will be added in ssl_write_server_key_exchange - * after the call to ssl_prepare_server_key_exchange. - * ssl_write_server_key_exchange also takes care of incrementing - * ssl->out_msglen. */ - if( ( ret = mbedtls_pk_sign( mbedtls_ssl_own_key( ssl ), - 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 ); - return( ret ); - } - } -#endif /* MBEDTLS_KEY_EXCHANGE_WITH_SERVER_SIGNATURE_ENABLED */ - - return( 0 ); -} - -/* Prepare the ServerKeyExchange message and send it. For ciphersuites - * that do not include a ServerKeyExchange message, do nothing. Either - * way, if successful, move on to the next step in the SSL state - * machine. */ -static int ssl_write_server_key_exchange( mbedtls_ssl_context *ssl ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - size_t signature_len = 0; -#if defined(MBEDTLS_KEY_EXCHANGE_SOME_NON_PFS_ENABLED) - const mbedtls_ssl_ciphersuite_t *ciphersuite_info = - ssl->handshake->ciphersuite_info; -#endif /* MBEDTLS_KEY_EXCHANGE_SOME_NON_PFS_ENABLED */ - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write server key exchange" ) ); - -#if defined(MBEDTLS_KEY_EXCHANGE_SOME_NON_PFS_ENABLED) - /* Extract static ECDH parameters and abort if ServerKeyExchange - * is not needed. */ - if( mbedtls_ssl_ciphersuite_no_pfs( ciphersuite_info ) ) - { - /* For suites involving ECDH, extract DH parameters - * from certificate at this point. */ -#if defined(MBEDTLS_KEY_EXCHANGE_SOME_ECDH_ENABLED) - if( mbedtls_ssl_ciphersuite_uses_ecdh( ciphersuite_info ) ) - { - ssl_get_ecdh_params_from_cert( ssl ); - } -#endif /* MBEDTLS_KEY_EXCHANGE_SOME_ECDH_ENABLED */ - - /* Key exchanges not involving ephemeral keys don't use - * ServerKeyExchange, so end here. */ - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip write server key exchange" ) ); - ssl->state++; - return( 0 ); - } -#endif /* MBEDTLS_KEY_EXCHANGE_SOME_NON_PFS_ENABLED */ - -#if defined(MBEDTLS_KEY_EXCHANGE_WITH_SERVER_SIGNATURE_ENABLED) && \ - defined(MBEDTLS_SSL_ASYNC_PRIVATE) - /* If we have already prepared the message and there is an ongoing - * signature operation, resume signing. */ - if( ssl->handshake->async_in_progress != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "resuming signature operation" ) ); - ret = ssl_resume_server_key_exchange( ssl, &signature_len ); - } - else -#endif /* defined(MBEDTLS_KEY_EXCHANGE_WITH_SERVER_SIGNATURE_ENABLED) && - defined(MBEDTLS_SSL_ASYNC_PRIVATE) */ - { - /* ServerKeyExchange is needed. Prepare the message. */ - ret = ssl_prepare_server_key_exchange( ssl, &signature_len ); - } - - if( ret != 0 ) - { - /* If we're starting to write a new message, set ssl->out_msglen - * to 0. But if we're resuming after an asynchronous message, - * out_msglen is the amount of data written so far and mst be - * preserved. */ - if( ret == MBEDTLS_ERR_SSL_ASYNC_IN_PROGRESS ) - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write server key exchange (pending)" ) ); - else - ssl->out_msglen = 0; - return( ret ); - } - - /* If there is a signature, write its length. - * ssl_prepare_server_key_exchange already wrote the signature - * itself at its proper place in the output buffer. */ -#if defined(MBEDTLS_KEY_EXCHANGE_WITH_SERVER_SIGNATURE_ENABLED) - if( signature_len != 0 ) - { - ssl->out_msg[ssl->out_msglen++] = (unsigned char)( signature_len >> 8 ); - ssl->out_msg[ssl->out_msglen++] = (unsigned char)( signature_len ); - - MBEDTLS_SSL_DEBUG_BUF( 3, "my signature", - ssl->out_msg + ssl->out_msglen, - signature_len ); - - /* Skip over the already-written signature */ - ssl->out_msglen += signature_len; - } -#endif /* MBEDTLS_KEY_EXCHANGE_WITH_SERVER_SIGNATURE_ENABLED */ - - /* Add header and send. */ - ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE; - ssl->out_msg[0] = MBEDTLS_SSL_HS_SERVER_KEY_EXCHANGE; - - ssl->state++; - - if( ( ret = mbedtls_ssl_write_handshake_msg( ssl ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_handshake_msg", ret ); - return( ret ); - } - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write server key exchange" ) ); - return( 0 ); -} - -static int ssl_write_server_hello_done( mbedtls_ssl_context *ssl ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write server hello done" ) ); - - ssl->out_msglen = 4; - ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE; - ssl->out_msg[0] = MBEDTLS_SSL_HS_SERVER_HELLO_DONE; - - ssl->state++; - -#if defined(MBEDTLS_SSL_PROTO_DTLS) - if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) - mbedtls_ssl_send_flight_completed( ssl ); -#endif - - if( ( ret = mbedtls_ssl_write_handshake_msg( ssl ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_handshake_msg", ret ); - return( ret ); - } - -#if defined(MBEDTLS_SSL_PROTO_DTLS) - if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM && - ( ret = mbedtls_ssl_flight_transmit( ssl ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_flight_transmit", ret ); - return( ret ); - } -#endif /* MBEDTLS_SSL_PROTO_DTLS */ - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write server hello done" ) ); - - return( 0 ); -} - -#if defined(MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED) || \ - defined(MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED) -static int ssl_parse_client_dh_public( mbedtls_ssl_context *ssl, unsigned char **p, - const unsigned char *end ) -{ - int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE; - size_t n; - - /* - * Receive G^Y mod P, premaster = (G^Y)^X mod P - */ - if( *p + 2 > end ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE ); - } - - n = ( (*p)[0] << 8 ) | (*p)[1]; - *p += 2; - - if( *p + n > end ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE ); - } - - if( ( ret = mbedtls_dhm_read_public( &ssl->handshake->dhm_ctx, *p, n ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_dhm_read_public", ret ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE_RP ); - } - - *p += n; - - MBEDTLS_SSL_DEBUG_MPI( 3, "DHM: GY", &ssl->handshake->dhm_ctx.GY ); - - return( ret ); -} -#endif /* MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED || - MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED */ - -#if defined(MBEDTLS_KEY_EXCHANGE_RSA_ENABLED) || \ - defined(MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED) - -#if defined(MBEDTLS_SSL_ASYNC_PRIVATE) -static int ssl_resume_decrypt_pms( mbedtls_ssl_context *ssl, - unsigned char *peer_pms, - size_t *peer_pmslen, - size_t peer_pmssize ) -{ - int ret = ssl->conf->f_async_resume( ssl, - peer_pms, peer_pmslen, peer_pmssize ); - if( ret != MBEDTLS_ERR_SSL_ASYNC_IN_PROGRESS ) - { - ssl->handshake->async_in_progress = 0; - mbedtls_ssl_set_async_operation_data( ssl, NULL ); - } - MBEDTLS_SSL_DEBUG_RET( 2, "ssl_decrypt_encrypted_pms", ret ); - return( ret ); -} -#endif /* MBEDTLS_SSL_ASYNC_PRIVATE */ - -static int ssl_decrypt_encrypted_pms( mbedtls_ssl_context *ssl, - const unsigned char *p, - const unsigned char *end, - unsigned char *peer_pms, - size_t *peer_pmslen, - size_t peer_pmssize ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - mbedtls_pk_context *private_key = mbedtls_ssl_own_key( ssl ); - mbedtls_pk_context *public_key = &mbedtls_ssl_own_cert( ssl )->pk; - size_t len = mbedtls_pk_get_len( public_key ); - -#if defined(MBEDTLS_SSL_ASYNC_PRIVATE) - /* If we have already started decoding the message and there is an ongoing - * decryption operation, resume signing. */ - if( ssl->handshake->async_in_progress != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "resuming decryption operation" ) ); - return( ssl_resume_decrypt_pms( ssl, - peer_pms, peer_pmslen, peer_pmssize ) ); - } -#endif /* MBEDTLS_SSL_ASYNC_PRIVATE */ - - /* - * Prepare to decrypt the premaster using own private RSA key - */ -#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) || \ - defined(MBEDTLS_SSL_PROTO_TLS1_2) - if( ssl->minor_ver != MBEDTLS_SSL_MINOR_VERSION_0 ) - { - if ( p + 2 > end ) { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE ); - } - if( *p++ != ( ( len >> 8 ) & 0xFF ) || - *p++ != ( ( len ) & 0xFF ) ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE ); - } - } -#endif - - if( p + len != end ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE ); - } - - /* - * Decrypt the premaster secret - */ -#if defined(MBEDTLS_SSL_ASYNC_PRIVATE) - if( ssl->conf->f_async_decrypt_start != NULL ) - { - ret = ssl->conf->f_async_decrypt_start( ssl, - mbedtls_ssl_own_cert( ssl ), - p, len ); - switch( ret ) - { - case MBEDTLS_ERR_SSL_HW_ACCEL_FALLTHROUGH: - /* act as if f_async_decrypt_start was null */ - break; - case 0: - ssl->handshake->async_in_progress = 1; - return( ssl_resume_decrypt_pms( ssl, - peer_pms, - peer_pmslen, - peer_pmssize ) ); - case MBEDTLS_ERR_SSL_ASYNC_IN_PROGRESS: - ssl->handshake->async_in_progress = 1; - return( MBEDTLS_ERR_SSL_ASYNC_IN_PROGRESS ); - default: - MBEDTLS_SSL_DEBUG_RET( 1, "f_async_decrypt_start", ret ); - return( ret ); - } - } -#endif /* MBEDTLS_SSL_ASYNC_PRIVATE */ - - if( ! mbedtls_pk_can_do( private_key, MBEDTLS_PK_RSA ) ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "got no RSA private key" ) ); - return( MBEDTLS_ERR_SSL_PRIVATE_KEY_REQUIRED ); - } - - ret = mbedtls_pk_decrypt( private_key, p, len, - peer_pms, peer_pmslen, peer_pmssize, - ssl->conf->f_rng, ssl->conf->p_rng ); - return( ret ); -} - -static int ssl_parse_encrypted_pms( mbedtls_ssl_context *ssl, - const unsigned char *p, - const unsigned char *end, - size_t pms_offset ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - unsigned char *pms = ssl->handshake->premaster + pms_offset; - unsigned char ver[2]; - unsigned char fake_pms[48], peer_pms[48]; - unsigned char mask; - size_t i, peer_pmslen; - unsigned int diff; - - /* In case of a failure in decryption, the decryption may write less than - * 2 bytes of output, but we always read the first two bytes. It doesn't - * matter in the end because diff will be nonzero in that case due to - * ret being nonzero, and we only care whether diff is 0. - * But do initialize peer_pms and peer_pmslen for robustness anyway. This - * also makes memory analyzers happy (don't access uninitialized memory, - * even if it's an unsigned char). */ - peer_pms[0] = peer_pms[1] = ~0; - peer_pmslen = 0; - - ret = ssl_decrypt_encrypted_pms( ssl, p, end, - peer_pms, - &peer_pmslen, - sizeof( peer_pms ) ); - -#if defined(MBEDTLS_SSL_ASYNC_PRIVATE) - if ( ret == MBEDTLS_ERR_SSL_ASYNC_IN_PROGRESS ) - return( ret ); -#endif /* MBEDTLS_SSL_ASYNC_PRIVATE */ - - mbedtls_ssl_write_version( ssl->handshake->max_major_ver, - ssl->handshake->max_minor_ver, - ssl->conf->transport, ver ); - - /* Avoid data-dependent branches while checking for invalid - * padding, to protect against timing-based Bleichenbacher-type - * attacks. */ - diff = (unsigned int) ret; - diff |= peer_pmslen ^ 48; - diff |= peer_pms[0] ^ ver[0]; - diff |= peer_pms[1] ^ ver[1]; - - /* mask = diff ? 0xff : 0x00 using bit operations to avoid branches */ - /* MSVC has a warning about unary minus on unsigned, but this is - * well-defined and precisely what we want to do here */ -#if defined(_MSC_VER) -#pragma warning( push ) -#pragma warning( disable : 4146 ) -#endif - mask = - ( ( diff | - diff ) >> ( sizeof( unsigned int ) * 8 - 1 ) ); -#if defined(_MSC_VER) -#pragma warning( pop ) -#endif - - /* - * Protection against Bleichenbacher's attack: invalid PKCS#1 v1.5 padding - * must not cause the connection to end immediately; instead, send a - * bad_record_mac later in the handshake. - * To protect against timing-based variants of the attack, we must - * not have any branch that depends on whether the decryption was - * successful. In particular, always generate the fake premaster secret, - * regardless of whether it will ultimately influence the output or not. - */ - ret = ssl->conf->f_rng( ssl->conf->p_rng, fake_pms, sizeof( fake_pms ) ); - if( ret != 0 ) - { - /* It's ok to abort on an RNG failure, since this does not reveal - * anything about the RSA decryption. */ - return( ret ); - } - -#if defined(MBEDTLS_SSL_DEBUG_ALL) - if( diff != 0 ) - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) ); -#endif - - if( sizeof( ssl->handshake->premaster ) < pms_offset || - sizeof( ssl->handshake->premaster ) - pms_offset < 48 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); - return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); - } - ssl->handshake->pmslen = 48; - - /* Set pms to either the true or the fake PMS, without - * data-dependent branches. */ - for( i = 0; i < ssl->handshake->pmslen; i++ ) - pms[i] = ( mask & fake_pms[i] ) | ( (~mask) & peer_pms[i] ); - - return( 0 ); -} -#endif /* MBEDTLS_KEY_EXCHANGE_RSA_ENABLED || - MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED */ - -#if defined(MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED) -static int ssl_parse_client_psk_identity( mbedtls_ssl_context *ssl, unsigned char **p, - const unsigned char *end ) -{ - int ret = 0; - uint16_t n; - - if( ssl_conf_has_psk_or_cb( ssl->conf ) == 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "got no pre-shared key" ) ); - return( MBEDTLS_ERR_SSL_PRIVATE_KEY_REQUIRED ); - } - - /* - * Receive client pre-shared key identity name - */ - if( end - *p < 2 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE ); - } - - n = ( (*p)[0] << 8 ) | (*p)[1]; - *p += 2; - - if( n == 0 || n > end - *p ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE ); - } - - if( ssl->conf->f_psk != NULL ) - { - if( ssl->conf->f_psk( ssl->conf->p_psk, ssl, *p, n ) != 0 ) - ret = MBEDTLS_ERR_SSL_UNKNOWN_IDENTITY; - } - else - { - /* Identity is not a big secret since clients send it in the clear, - * but treat it carefully anyway, just in case */ - if( n != ssl->conf->psk_identity_len || - mbedtls_ssl_safer_memcmp( ssl->conf->psk_identity, *p, n ) != 0 ) - { - ret = MBEDTLS_ERR_SSL_UNKNOWN_IDENTITY; - } - } - - if( ret == MBEDTLS_ERR_SSL_UNKNOWN_IDENTITY ) - { - MBEDTLS_SSL_DEBUG_BUF( 3, "Unknown PSK identity", *p, n ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_UNKNOWN_PSK_IDENTITY ); - return( MBEDTLS_ERR_SSL_UNKNOWN_IDENTITY ); - } - - *p += n; - - return( 0 ); -} -#endif /* MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED */ - -static int ssl_parse_client_key_exchange( mbedtls_ssl_context *ssl ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - const mbedtls_ssl_ciphersuite_t *ciphersuite_info; - unsigned char *p, *end; - - ciphersuite_info = ssl->handshake->ciphersuite_info; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse client key exchange" ) ); - -#if defined(MBEDTLS_SSL_ASYNC_PRIVATE) && \ - ( defined(MBEDTLS_KEY_EXCHANGE_RSA_ENABLED) || \ - defined(MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED) ) - if( ( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA_PSK || - ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA ) && - ( ssl->handshake->async_in_progress != 0 ) ) - { - /* We've already read a record and there is an asynchronous - * operation in progress to decrypt it. So skip reading the - * record. */ - MBEDTLS_SSL_DEBUG_MSG( 3, ( "will resume decryption of previously-read record" ) ); - } - else -#endif - if( ( ret = mbedtls_ssl_read_record( ssl, 1 ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_read_record", ret ); - return( ret ); - } - - p = ssl->in_msg + mbedtls_ssl_hs_hdr_len( ssl ); - end = ssl->in_msg + ssl->in_hslen; - - if( ssl->in_msgtype != MBEDTLS_SSL_MSG_HANDSHAKE ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE ); - } - - if( ssl->in_msg[0] != MBEDTLS_SSL_HS_CLIENT_KEY_EXCHANGE ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE ); - } - -#if defined(MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED) - if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_RSA ) - { - if( ( ret = ssl_parse_client_dh_public( ssl, &p, end ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, ( "ssl_parse_client_dh_public" ), ret ); - return( ret ); - } - - if( p != end ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange" ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE ); - } - - if( ( ret = mbedtls_dhm_calc_secret( &ssl->handshake->dhm_ctx, - ssl->handshake->premaster, - MBEDTLS_PREMASTER_SIZE, - &ssl->handshake->pmslen, - ssl->conf->f_rng, ssl->conf->p_rng ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_dhm_calc_secret", ret ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE_CS ); - } - - MBEDTLS_SSL_DEBUG_MPI( 3, "DHM: K ", &ssl->handshake->dhm_ctx.K ); - } - else -#endif /* MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED */ -#if defined(MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED) || \ - defined(MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED) || \ - defined(MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED) || \ - defined(MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED) - if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_RSA || - ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA || - ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDH_RSA || - ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA ) - { - if( ( ret = mbedtls_ecdh_read_public( &ssl->handshake->ecdh_ctx, - p, end - p) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecdh_read_public", ret ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE_RP ); - } - - MBEDTLS_SSL_DEBUG_ECDH( 3, &ssl->handshake->ecdh_ctx, - MBEDTLS_DEBUG_ECDH_QP ); - - if( ( ret = mbedtls_ecdh_calc_secret( &ssl->handshake->ecdh_ctx, - &ssl->handshake->pmslen, - ssl->handshake->premaster, - MBEDTLS_MPI_MAX_SIZE, - ssl->conf->f_rng, ssl->conf->p_rng ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecdh_calc_secret", ret ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE_CS ); - } - - MBEDTLS_SSL_DEBUG_ECDH( 3, &ssl->handshake->ecdh_ctx, - MBEDTLS_DEBUG_ECDH_Z ); - } - else -#endif /* MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED || - MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED || - MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED || - MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED */ -#if defined(MBEDTLS_KEY_EXCHANGE_PSK_ENABLED) - if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_PSK ) - { - if( ( ret = ssl_parse_client_psk_identity( ssl, &p, end ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, ( "ssl_parse_client_psk_identity" ), ret ); - return( ret ); - } - - if( p != end ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange" ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE ); - } - -#if defined(MBEDTLS_USE_PSA_CRYPTO) - /* For opaque PSKs, we perform the PSK-to-MS derivation atomatically - * and skip the intermediate PMS. */ - if( ssl_use_opaque_psk( ssl ) == 1 ) - MBEDTLS_SSL_DEBUG_MSG( 1, ( "skip PMS generation for opaque PSK" ) ); - else -#endif /* MBEDTLS_USE_PSA_CRYPTO */ - if( ( ret = mbedtls_ssl_psk_derive_premaster( ssl, - ciphersuite_info->key_exchange ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_psk_derive_premaster", ret ); - return( ret ); - } - } - else -#endif /* MBEDTLS_KEY_EXCHANGE_PSK_ENABLED */ -#if defined(MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED) - if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA_PSK ) - { -#if defined(MBEDTLS_SSL_ASYNC_PRIVATE) - if ( ssl->handshake->async_in_progress != 0 ) - { - /* There is an asynchronous operation in progress to - * decrypt the encrypted premaster secret, so skip - * directly to resuming this operation. */ - MBEDTLS_SSL_DEBUG_MSG( 3, ( "PSK identity already parsed" ) ); - /* Update p to skip the PSK identity. ssl_parse_encrypted_pms - * won't actually use it, but maintain p anyway for robustness. */ - p += ssl->conf->psk_identity_len + 2; - } - else -#endif /* MBEDTLS_SSL_ASYNC_PRIVATE */ - if( ( ret = ssl_parse_client_psk_identity( ssl, &p, end ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, ( "ssl_parse_client_psk_identity" ), ret ); - return( ret ); - } - -#if defined(MBEDTLS_USE_PSA_CRYPTO) - /* Opaque PSKs are currently only supported for PSK-only. */ - if( ssl_use_opaque_psk( ssl ) == 1 ) - return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE ); -#endif - - if( ( ret = ssl_parse_encrypted_pms( ssl, p, end, 2 ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, ( "ssl_parse_encrypted_pms" ), ret ); - return( ret ); - } - - if( ( ret = mbedtls_ssl_psk_derive_premaster( ssl, - ciphersuite_info->key_exchange ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_psk_derive_premaster", ret ); - return( ret ); - } - } - else -#endif /* MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED */ -#if defined(MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED) - if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_PSK ) - { - if( ( ret = ssl_parse_client_psk_identity( ssl, &p, end ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, ( "ssl_parse_client_psk_identity" ), ret ); - return( ret ); - } - if( ( ret = ssl_parse_client_dh_public( ssl, &p, end ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, ( "ssl_parse_client_dh_public" ), ret ); - return( ret ); - } - -#if defined(MBEDTLS_USE_PSA_CRYPTO) - /* Opaque PSKs are currently only supported for PSK-only. */ - if( ssl_use_opaque_psk( ssl ) == 1 ) - return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE ); -#endif - - if( p != end ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange" ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE ); - } - - if( ( ret = mbedtls_ssl_psk_derive_premaster( ssl, - ciphersuite_info->key_exchange ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_psk_derive_premaster", ret ); - return( ret ); - } - } - else -#endif /* MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED */ -#if defined(MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED) - if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_PSK ) - { - if( ( ret = ssl_parse_client_psk_identity( ssl, &p, end ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, ( "ssl_parse_client_psk_identity" ), ret ); - return( ret ); - } - - if( ( ret = mbedtls_ecdh_read_public( &ssl->handshake->ecdh_ctx, - p, end - p ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecdh_read_public", ret ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE_RP ); - } - -#if defined(MBEDTLS_USE_PSA_CRYPTO) - /* Opaque PSKs are currently only supported for PSK-only. */ - if( ssl_use_opaque_psk( ssl ) == 1 ) - return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE ); -#endif - - MBEDTLS_SSL_DEBUG_ECDH( 3, &ssl->handshake->ecdh_ctx, - MBEDTLS_DEBUG_ECDH_QP ); - - if( ( ret = mbedtls_ssl_psk_derive_premaster( ssl, - ciphersuite_info->key_exchange ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_psk_derive_premaster", ret ); - return( ret ); - } - } - else -#endif /* MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED */ -#if defined(MBEDTLS_KEY_EXCHANGE_RSA_ENABLED) - if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA ) - { - if( ( ret = ssl_parse_encrypted_pms( ssl, p, end, 0 ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, ( "ssl_parse_parse_encrypted_pms_secret" ), ret ); - return( ret ); - } - } - else -#endif /* MBEDTLS_KEY_EXCHANGE_RSA_ENABLED */ -#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED) - if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECJPAKE ) - { - ret = mbedtls_ecjpake_read_round_two( &ssl->handshake->ecjpake_ctx, - p, end - p ); - if( ret != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecjpake_read_round_two", ret ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE ); - } - - ret = mbedtls_ecjpake_derive_secret( &ssl->handshake->ecjpake_ctx, - ssl->handshake->premaster, 32, &ssl->handshake->pmslen, - ssl->conf->f_rng, ssl->conf->p_rng ); - if( ret != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecjpake_derive_secret", ret ); - return( ret ); - } - } - else -#endif /* MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */ - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); - return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); - } - - if( ( ret = mbedtls_ssl_derive_keys( ssl ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_derive_keys", ret ); - return( ret ); - } - - ssl->state++; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse client key exchange" ) ); - - return( 0 ); -} - -#if !defined(MBEDTLS_KEY_EXCHANGE_CERT_REQ_ALLOWED_ENABLED) -static int ssl_parse_certificate_verify( mbedtls_ssl_context *ssl ) -{ - const mbedtls_ssl_ciphersuite_t *ciphersuite_info = - ssl->handshake->ciphersuite_info; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse certificate verify" ) ); - - if( !mbedtls_ssl_ciphersuite_cert_req_allowed( ciphersuite_info ) ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip parse certificate verify" ) ); - ssl->state++; - return( 0 ); - } - - MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); - return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); -} -#else /* !MBEDTLS_KEY_EXCHANGE_CERT_REQ_ALLOWED_ENABLED */ -static int ssl_parse_certificate_verify( mbedtls_ssl_context *ssl ) -{ - int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE; - size_t i, sig_len; - unsigned char hash[48]; - unsigned char *hash_start = hash; - size_t hashlen; -#if defined(MBEDTLS_SSL_PROTO_TLS1_2) - mbedtls_pk_type_t pk_alg; -#endif - mbedtls_md_type_t md_alg; - const mbedtls_ssl_ciphersuite_t *ciphersuite_info = - ssl->handshake->ciphersuite_info; - mbedtls_pk_context * peer_pk; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse certificate verify" ) ); - - if( !mbedtls_ssl_ciphersuite_cert_req_allowed( ciphersuite_info ) ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip parse certificate verify" ) ); - ssl->state++; - return( 0 ); - } - -#if defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE) - if( ssl->session_negotiate->peer_cert == NULL ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip parse certificate verify" ) ); - ssl->state++; - return( 0 ); - } -#else /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ - if( ssl->session_negotiate->peer_cert_digest == NULL ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip parse certificate verify" ) ); - ssl->state++; - return( 0 ); - } -#endif /* !MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ - - /* Read the message without adding it to the checksum */ - ret = mbedtls_ssl_read_record( ssl, 0 /* no checksum update */ ); - if( 0 != ret ) - { - MBEDTLS_SSL_DEBUG_RET( 1, ( "mbedtls_ssl_read_record" ), ret ); - return( ret ); - } - - ssl->state++; - - /* Process the message contents */ - if( ssl->in_msgtype != MBEDTLS_SSL_MSG_HANDSHAKE || - ssl->in_msg[0] != MBEDTLS_SSL_HS_CERTIFICATE_VERIFY ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate verify message" ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE_VERIFY ); - } - - i = mbedtls_ssl_hs_hdr_len( ssl ); - -#if !defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE) - peer_pk = &ssl->handshake->peer_pubkey; -#else /* !MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ - if( ssl->session_negotiate->peer_cert == NULL ) - { - /* Should never happen */ - return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); - } - peer_pk = &ssl->session_negotiate->peer_cert->pk; -#endif /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ - - /* - * struct { - * SignatureAndHashAlgorithm algorithm; -- TLS 1.2 only - * opaque signature<0..2^16-1>; - * } DigitallySigned; - */ -#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \ - defined(MBEDTLS_SSL_PROTO_TLS1_1) - if( ssl->minor_ver != MBEDTLS_SSL_MINOR_VERSION_3 ) - { - md_alg = MBEDTLS_MD_NONE; - hashlen = 36; - - /* For ECDSA, use SHA-1, not MD-5 + SHA-1 */ - if( mbedtls_pk_can_do( peer_pk, MBEDTLS_PK_ECDSA ) ) - { - hash_start += 16; - hashlen -= 16; - md_alg = MBEDTLS_MD_SHA1; - } - } - else -#endif /* MBEDTLS_SSL_PROTO_SSL3 || MBEDTLS_SSL_PROTO_TLS1 || - MBEDTLS_SSL_PROTO_TLS1_1 */ -#if defined(MBEDTLS_SSL_PROTO_TLS1_2) - if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 ) - { - if( i + 2 > ssl->in_hslen ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate verify message" ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE_VERIFY ); - } - - /* - * Hash - */ - md_alg = mbedtls_ssl_md_alg_from_hash( ssl->in_msg[i] ); - - if( md_alg == MBEDTLS_MD_NONE || mbedtls_ssl_set_calc_verify_md( ssl, ssl->in_msg[i] ) ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "peer not adhering to requested sig_alg" - " for verify message" ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE_VERIFY ); - } - -#if !defined(MBEDTLS_MD_SHA1) - if( MBEDTLS_MD_SHA1 == md_alg ) - hash_start += 16; -#endif - - /* Info from md_alg will be used instead */ - hashlen = 0; - - i++; - - /* - * Signature - */ - if( ( pk_alg = mbedtls_ssl_pk_alg_from_sig( ssl->in_msg[i] ) ) - == MBEDTLS_PK_NONE ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "peer not adhering to requested sig_alg" - " for verify message" ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE_VERIFY ); - } - - /* - * Check the certificate's key type matches the signature alg - */ - if( !mbedtls_pk_can_do( peer_pk, pk_alg ) ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "sig_alg doesn't match cert key" ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE_VERIFY ); - } - - i++; - } - else -#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); - return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); - } - - if( i + 2 > ssl->in_hslen ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate verify message" ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE_VERIFY ); - } - - sig_len = ( ssl->in_msg[i] << 8 ) | ssl->in_msg[i+1]; - i += 2; - - if( i + sig_len != ssl->in_hslen ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate verify message" ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE_VERIFY ); - } - - /* Calculate hash and verify signature */ - { - size_t dummy_hlen; - ssl->handshake->calc_verify( ssl, hash, &dummy_hlen ); - } - - if( ( ret = mbedtls_pk_verify( peer_pk, - md_alg, hash_start, hashlen, - ssl->in_msg + i, sig_len ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_pk_verify", ret ); - return( ret ); - } - - mbedtls_ssl_update_handshake_status( ssl ); - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse certificate verify" ) ); - - return( ret ); -} -#endif /* MBEDTLS_KEY_EXCHANGE_CERT_REQ_ALLOWED_ENABLED */ - -#if defined(MBEDTLS_SSL_SESSION_TICKETS) -static int ssl_write_new_session_ticket( mbedtls_ssl_context *ssl ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - size_t tlen; - uint32_t lifetime; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write new session ticket" ) ); - - ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE; - ssl->out_msg[0] = MBEDTLS_SSL_HS_NEW_SESSION_TICKET; - - /* - * struct { - * uint32 ticket_lifetime_hint; - * opaque ticket<0..2^16-1>; - * } NewSessionTicket; - * - * 4 . 7 ticket_lifetime_hint (0 = unspecified) - * 8 . 9 ticket_len (n) - * 10 . 9+n ticket content - */ - - if( ( ret = ssl->conf->f_ticket_write( ssl->conf->p_ticket, - ssl->session_negotiate, - ssl->out_msg + 10, - ssl->out_msg + MBEDTLS_SSL_OUT_CONTENT_LEN, - &tlen, &lifetime ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_ticket_write", ret ); - tlen = 0; - } - - ssl->out_msg[4] = ( lifetime >> 24 ) & 0xFF; - ssl->out_msg[5] = ( lifetime >> 16 ) & 0xFF; - ssl->out_msg[6] = ( lifetime >> 8 ) & 0xFF; - ssl->out_msg[7] = ( lifetime ) & 0xFF; - - ssl->out_msg[8] = (unsigned char)( ( tlen >> 8 ) & 0xFF ); - ssl->out_msg[9] = (unsigned char)( ( tlen ) & 0xFF ); - - ssl->out_msglen = 10 + tlen; - - /* - * Morally equivalent to updating ssl->state, but NewSessionTicket and - * ChangeCipherSpec share the same state. - */ - ssl->handshake->new_session_ticket = 0; - - if( ( ret = mbedtls_ssl_write_handshake_msg( ssl ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_handshake_msg", ret ); - return( ret ); - } - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write new session ticket" ) ); - - return( 0 ); -} -#endif /* MBEDTLS_SSL_SESSION_TICKETS */ - -/* - * SSL handshake -- server side -- single step - */ -int mbedtls_ssl_handshake_server_step( mbedtls_ssl_context *ssl ) -{ - int ret = 0; - - if( ssl->state == MBEDTLS_SSL_HANDSHAKE_OVER || ssl->handshake == NULL ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "server state: %d", ssl->state ) ); - - if( ( ret = mbedtls_ssl_flush_output( ssl ) ) != 0 ) - return( ret ); - -#if defined(MBEDTLS_SSL_PROTO_DTLS) - if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM && - ssl->handshake->retransmit_state == MBEDTLS_SSL_RETRANS_SENDING ) - { - if( ( ret = mbedtls_ssl_flight_transmit( ssl ) ) != 0 ) - return( ret ); - } -#endif /* MBEDTLS_SSL_PROTO_DTLS */ - - switch( ssl->state ) - { - case MBEDTLS_SSL_HELLO_REQUEST: - ssl->state = MBEDTLS_SSL_CLIENT_HELLO; - break; - - /* - * <== ClientHello - */ - case MBEDTLS_SSL_CLIENT_HELLO: - ret = ssl_parse_client_hello( ssl ); - break; - -#if defined(MBEDTLS_SSL_PROTO_DTLS) - case MBEDTLS_SSL_SERVER_HELLO_VERIFY_REQUEST_SENT: - return( MBEDTLS_ERR_SSL_HELLO_VERIFY_REQUIRED ); -#endif - - /* - * ==> ServerHello - * Certificate - * ( ServerKeyExchange ) - * ( CertificateRequest ) - * ServerHelloDone - */ - case MBEDTLS_SSL_SERVER_HELLO: - ret = ssl_write_server_hello( ssl ); - break; - - case MBEDTLS_SSL_SERVER_CERTIFICATE: - ret = mbedtls_ssl_write_certificate( ssl ); - break; - - case MBEDTLS_SSL_SERVER_KEY_EXCHANGE: - ret = ssl_write_server_key_exchange( ssl ); - break; - - case MBEDTLS_SSL_CERTIFICATE_REQUEST: - ret = ssl_write_certificate_request( ssl ); - break; - - case MBEDTLS_SSL_SERVER_HELLO_DONE: - ret = ssl_write_server_hello_done( ssl ); - break; - - /* - * <== ( Certificate/Alert ) - * ClientKeyExchange - * ( CertificateVerify ) - * ChangeCipherSpec - * Finished - */ - case MBEDTLS_SSL_CLIENT_CERTIFICATE: - ret = mbedtls_ssl_parse_certificate( ssl ); - break; - - case MBEDTLS_SSL_CLIENT_KEY_EXCHANGE: - ret = ssl_parse_client_key_exchange( ssl ); - break; - - case MBEDTLS_SSL_CERTIFICATE_VERIFY: - ret = ssl_parse_certificate_verify( ssl ); - break; - - case MBEDTLS_SSL_CLIENT_CHANGE_CIPHER_SPEC: - ret = mbedtls_ssl_parse_change_cipher_spec( ssl ); - break; - - case MBEDTLS_SSL_CLIENT_FINISHED: - ret = mbedtls_ssl_parse_finished( ssl ); - break; - - /* - * ==> ( NewSessionTicket ) - * ChangeCipherSpec - * Finished - */ - case MBEDTLS_SSL_SERVER_CHANGE_CIPHER_SPEC: -#if defined(MBEDTLS_SSL_SESSION_TICKETS) - if( ssl->handshake->new_session_ticket != 0 ) - ret = ssl_write_new_session_ticket( ssl ); - else -#endif - ret = mbedtls_ssl_write_change_cipher_spec( ssl ); - break; - - case MBEDTLS_SSL_SERVER_FINISHED: - ret = mbedtls_ssl_write_finished( ssl ); - break; - - case MBEDTLS_SSL_FLUSH_BUFFERS: - MBEDTLS_SSL_DEBUG_MSG( 2, ( "handshake: done" ) ); - ssl->state = MBEDTLS_SSL_HANDSHAKE_WRAPUP; - break; - - case MBEDTLS_SSL_HANDSHAKE_WRAPUP: - mbedtls_ssl_handshake_wrapup( ssl ); - break; - - default: - MBEDTLS_SSL_DEBUG_MSG( 1, ( "invalid state %d", ssl->state ) ); - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - } - - return( ret ); -} -#endif /* MBEDTLS_SSL_SRV_C */ |