diff options
Diffstat (limited to 'externals/mbedtls/library/ssl_cli.c')
| -rw-r--r-- | externals/mbedtls/library/ssl_cli.c | 3913 |
1 files changed, 0 insertions, 3913 deletions
diff --git a/externals/mbedtls/library/ssl_cli.c b/externals/mbedtls/library/ssl_cli.c deleted file mode 100644 index 073311b070..0000000000 --- a/externals/mbedtls/library/ssl_cli.c +++ /dev/null @@ -1,3913 +0,0 @@ -/* - * SSLv3/TLSv1 client-side functions - * - * Copyright The Mbed TLS Contributors - * SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later - * - * This file is provided under the Apache License 2.0, or the - * GNU General Public License v2.0 or later. - * - * ********** - * Apache License 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. - * - * ********** - * - * ********** - * GNU General Public License v2.0 or later: - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License along - * with this program; if not, write to the Free Software Foundation, Inc., - * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. - * - * ********** - */ - -#if !defined(MBEDTLS_CONFIG_FILE) -#include "mbedtls/config.h" -#else -#include MBEDTLS_CONFIG_FILE -#endif - -#if defined(MBEDTLS_SSL_CLI_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/debug.h" -#include "mbedtls/ssl.h" -#include "mbedtls/ssl_internal.h" - -#include <string.h> - -#include <stdint.h> - -#if defined(MBEDTLS_HAVE_TIME) -#include "mbedtls/platform_time.h" -#endif - -#if defined(MBEDTLS_SSL_SESSION_TICKETS) -#include "mbedtls/platform_util.h" -#endif - -#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION) -static int ssl_write_hostname_ext( mbedtls_ssl_context *ssl, - unsigned char *buf, - const unsigned char *end, - size_t *olen ) -{ - unsigned char *p = buf; - size_t hostname_len; - - *olen = 0; - - if( ssl->hostname == NULL ) - return( 0 ); - - MBEDTLS_SSL_DEBUG_MSG( 3, - ( "client hello, adding server name extension: %s", - ssl->hostname ) ); - - hostname_len = strlen( ssl->hostname ); - - MBEDTLS_SSL_CHK_BUF_PTR( p, end, hostname_len + 9 ); - - /* - * Sect. 3, RFC 6066 (TLS Extensions Definitions) - * - * In order to provide any of the server names, clients MAY include an - * extension of type "server_name" in the (extended) client hello. The - * "extension_data" field of this extension SHALL contain - * "ServerNameList" where: - * - * struct { - * NameType name_type; - * select (name_type) { - * case host_name: HostName; - * } name; - * } ServerName; - * - * enum { - * host_name(0), (255) - * } NameType; - * - * opaque HostName<1..2^16-1>; - * - * struct { - * ServerName server_name_list<1..2^16-1> - * } ServerNameList; - * - */ - *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SERVERNAME >> 8 ) & 0xFF ); - *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SERVERNAME ) & 0xFF ); - - *p++ = (unsigned char)( ( (hostname_len + 5) >> 8 ) & 0xFF ); - *p++ = (unsigned char)( ( (hostname_len + 5) ) & 0xFF ); - - *p++ = (unsigned char)( ( (hostname_len + 3) >> 8 ) & 0xFF ); - *p++ = (unsigned char)( ( (hostname_len + 3) ) & 0xFF ); - - *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SERVERNAME_HOSTNAME ) & 0xFF ); - *p++ = (unsigned char)( ( hostname_len >> 8 ) & 0xFF ); - *p++ = (unsigned char)( ( hostname_len ) & 0xFF ); - - memcpy( p, ssl->hostname, hostname_len ); - - *olen = hostname_len + 9; - - return( 0 ); -} -#endif /* MBEDTLS_SSL_SERVER_NAME_INDICATION */ - -#if defined(MBEDTLS_SSL_RENEGOTIATION) -static int ssl_write_renegotiation_ext( mbedtls_ssl_context *ssl, - unsigned char *buf, - const unsigned char *end, - size_t *olen ) -{ - unsigned char *p = buf; - - *olen = 0; - - /* We're always including an TLS_EMPTY_RENEGOTIATION_INFO_SCSV in the - * initial ClientHello, in which case also adding the renegotiation - * info extension is NOT RECOMMENDED as per RFC 5746 Section 3.4. */ - if( ssl->renego_status != MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS ) - return( 0 ); - - MBEDTLS_SSL_DEBUG_MSG( 3, - ( "client hello, adding renegotiation extension" ) ); - - MBEDTLS_SSL_CHK_BUF_PTR( p, end, 5 + ssl->verify_data_len ); - - /* - * Secure renegotiation - */ - *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_RENEGOTIATION_INFO >> 8 ) - & 0xFF ); - *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_RENEGOTIATION_INFO ) - & 0xFF ); - - *p++ = 0x00; - *p++ = ( ssl->verify_data_len + 1 ) & 0xFF; - *p++ = ssl->verify_data_len & 0xFF; - - memcpy( p, ssl->own_verify_data, ssl->verify_data_len ); - - *olen = 5 + ssl->verify_data_len; - - return( 0 ); -} -#endif /* MBEDTLS_SSL_RENEGOTIATION */ - -/* - * Only if we handle at least one key exchange that needs signatures. - */ -#if defined(MBEDTLS_SSL_PROTO_TLS1_2) && \ - defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED) -static int ssl_write_signature_algorithms_ext( mbedtls_ssl_context *ssl, - unsigned char *buf, - const unsigned char *end, - size_t *olen ) -{ - unsigned char *p = buf; - size_t sig_alg_len = 0; - const int *md; - -#if defined(MBEDTLS_RSA_C) || defined(MBEDTLS_ECDSA_C) - unsigned char *sig_alg_list = buf + 6; -#endif - - *olen = 0; - - if( ssl->conf->max_minor_ver != MBEDTLS_SSL_MINOR_VERSION_3 ) - return( 0 ); - - MBEDTLS_SSL_DEBUG_MSG( 3, - ( "client hello, adding signature_algorithms extension" ) ); - - if( ssl->conf->sig_hashes == NULL ) - return( MBEDTLS_ERR_SSL_BAD_CONFIG ); - - for( md = ssl->conf->sig_hashes; *md != MBEDTLS_MD_NONE; md++ ) - { -#if defined(MBEDTLS_ECDSA_C) - sig_alg_len += 2; -#endif -#if defined(MBEDTLS_RSA_C) - sig_alg_len += 2; -#endif - if( sig_alg_len > MBEDTLS_SSL_MAX_SIG_HASH_ALG_LIST_LEN ) - { - MBEDTLS_SSL_DEBUG_MSG( 3, - ( "length in bytes of sig-hash-alg extension too big" ) ); - return( MBEDTLS_ERR_SSL_BAD_CONFIG ); - } - } - - /* Empty signature algorithms list, this is a configuration error. */ - if( sig_alg_len == 0 ) - return( MBEDTLS_ERR_SSL_BAD_CONFIG ); - - MBEDTLS_SSL_CHK_BUF_PTR( p, end, sig_alg_len + 6 ); - - /* - * Prepare signature_algorithms extension (TLS 1.2) - */ - sig_alg_len = 0; - - for( md = ssl->conf->sig_hashes; *md != MBEDTLS_MD_NONE; md++ ) - { -#if defined(MBEDTLS_ECDSA_C) - sig_alg_list[sig_alg_len++] = mbedtls_ssl_hash_from_md_alg( *md ); - sig_alg_list[sig_alg_len++] = MBEDTLS_SSL_SIG_ECDSA; -#endif -#if defined(MBEDTLS_RSA_C) - sig_alg_list[sig_alg_len++] = mbedtls_ssl_hash_from_md_alg( *md ); - sig_alg_list[sig_alg_len++] = MBEDTLS_SSL_SIG_RSA; -#endif - } - - /* - * enum { - * none(0), md5(1), sha1(2), sha224(3), sha256(4), sha384(5), - * sha512(6), (255) - * } HashAlgorithm; - * - * enum { anonymous(0), rsa(1), dsa(2), ecdsa(3), (255) } - * SignatureAlgorithm; - * - * struct { - * HashAlgorithm hash; - * SignatureAlgorithm signature; - * } SignatureAndHashAlgorithm; - * - * SignatureAndHashAlgorithm - * supported_signature_algorithms<2..2^16-2>; - */ - *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SIG_ALG >> 8 ) & 0xFF ); - *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SIG_ALG ) & 0xFF ); - - *p++ = (unsigned char)( ( ( sig_alg_len + 2 ) >> 8 ) & 0xFF ); - *p++ = (unsigned char)( ( ( sig_alg_len + 2 ) ) & 0xFF ); - - *p++ = (unsigned char)( ( sig_alg_len >> 8 ) & 0xFF ); - *p++ = (unsigned char)( ( sig_alg_len ) & 0xFF ); - - *olen = 6 + sig_alg_len; - - 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_write_supported_elliptic_curves_ext( mbedtls_ssl_context *ssl, - unsigned char *buf, - const unsigned char *end, - size_t *olen ) -{ - unsigned char *p = buf; - unsigned char *elliptic_curve_list = p + 6; - size_t elliptic_curve_len = 0; - const mbedtls_ecp_curve_info *info; - const mbedtls_ecp_group_id *grp_id; - - *olen = 0; - - MBEDTLS_SSL_DEBUG_MSG( 3, - ( "client hello, adding supported_elliptic_curves extension" ) ); - - if( ssl->conf->curve_list == NULL ) - return( MBEDTLS_ERR_SSL_BAD_CONFIG ); - - for( grp_id = ssl->conf->curve_list; - *grp_id != MBEDTLS_ECP_DP_NONE; - grp_id++ ) - { - info = mbedtls_ecp_curve_info_from_grp_id( *grp_id ); - if( info == NULL ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, - ( "invalid curve in ssl configuration" ) ); - return( MBEDTLS_ERR_SSL_BAD_CONFIG ); - } - elliptic_curve_len += 2; - - if( elliptic_curve_len > MBEDTLS_SSL_MAX_CURVE_LIST_LEN ) - { - MBEDTLS_SSL_DEBUG_MSG( 3, - ( "malformed supported_elliptic_curves extension in config" ) ); - return( MBEDTLS_ERR_SSL_BAD_CONFIG ); - } - } - - /* Empty elliptic curve list, this is a configuration error. */ - if( elliptic_curve_len == 0 ) - return( MBEDTLS_ERR_SSL_BAD_CONFIG ); - - MBEDTLS_SSL_CHK_BUF_PTR( p, end, 6 + elliptic_curve_len ); - - elliptic_curve_len = 0; - - for( grp_id = ssl->conf->curve_list; - *grp_id != MBEDTLS_ECP_DP_NONE; - grp_id++ ) - { - info = mbedtls_ecp_curve_info_from_grp_id( *grp_id ); - elliptic_curve_list[elliptic_curve_len++] = info->tls_id >> 8; - elliptic_curve_list[elliptic_curve_len++] = info->tls_id & 0xFF; - } - - *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SUPPORTED_ELLIPTIC_CURVES >> 8 ) - & 0xFF ); - *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SUPPORTED_ELLIPTIC_CURVES ) - & 0xFF ); - - *p++ = (unsigned char)( ( ( elliptic_curve_len + 2 ) >> 8 ) & 0xFF ); - *p++ = (unsigned char)( ( ( elliptic_curve_len + 2 ) ) & 0xFF ); - - *p++ = (unsigned char)( ( ( elliptic_curve_len ) >> 8 ) & 0xFF ); - *p++ = (unsigned char)( ( ( elliptic_curve_len ) ) & 0xFF ); - - *olen = 6 + elliptic_curve_len; - - return( 0 ); -} - -static int ssl_write_supported_point_formats_ext( mbedtls_ssl_context *ssl, - unsigned char *buf, - const unsigned char *end, - size_t *olen ) -{ - unsigned char *p = buf; - (void) ssl; /* ssl used for debugging only */ - - *olen = 0; - - MBEDTLS_SSL_DEBUG_MSG( 3, - ( "client hello, adding supported_point_formats extension" ) ); - MBEDTLS_SSL_CHK_BUF_PTR( p, end, 6 ); - - *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; - - return( 0 ); -} -#endif /* MBEDTLS_ECDH_C || MBEDTLS_ECDSA_C || - MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */ - -#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED) -static int ssl_write_ecjpake_kkpp_ext( mbedtls_ssl_context *ssl, - unsigned char *buf, - const unsigned char *end, - size_t *olen ) -{ - int ret; - unsigned char *p = buf; - size_t kkpp_len; - - *olen = 0; - - /* Skip costly extension if we can't use EC J-PAKE anyway */ - if( mbedtls_ecjpake_check( &ssl->handshake->ecjpake_ctx ) != 0 ) - return( 0 ); - - MBEDTLS_SSL_DEBUG_MSG( 3, - ( "client hello, adding ecjpake_kkpp extension" ) ); - - MBEDTLS_SSL_CHK_BUF_PTR( p, end, 4 ); - - *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_ECJPAKE_KKPP >> 8 ) & 0xFF ); - *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_ECJPAKE_KKPP ) & 0xFF ); - - /* - * We may need to send ClientHello multiple times for Hello verification. - * We don't want to compute fresh values every time (both for performance - * and consistency reasons), so cache the extension content. - */ - if( ssl->handshake->ecjpake_cache == NULL || - ssl->handshake->ecjpake_cache_len == 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "generating new ecjpake parameters" ) ); - - 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( ret ); - } - - ssl->handshake->ecjpake_cache = mbedtls_calloc( 1, kkpp_len ); - if( ssl->handshake->ecjpake_cache == NULL ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "allocation failed" ) ); - return( MBEDTLS_ERR_SSL_ALLOC_FAILED ); - } - - memcpy( ssl->handshake->ecjpake_cache, p + 2, kkpp_len ); - ssl->handshake->ecjpake_cache_len = kkpp_len; - } - else - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "re-using cached ecjpake parameters" ) ); - - kkpp_len = ssl->handshake->ecjpake_cache_len; - MBEDTLS_SSL_CHK_BUF_PTR( p + 2, end, kkpp_len ); - - memcpy( p + 2, ssl->handshake->ecjpake_cache, kkpp_len ); - } - - *p++ = (unsigned char)( ( kkpp_len >> 8 ) & 0xFF ); - *p++ = (unsigned char)( ( kkpp_len ) & 0xFF ); - - *olen = kkpp_len + 4; - - return( 0 ); -} -#endif /* MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */ - -#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH) -static int ssl_write_max_fragment_length_ext( mbedtls_ssl_context *ssl, - unsigned char *buf, - const unsigned char *end, - size_t *olen ) -{ - unsigned char *p = buf; - - *olen = 0; - - if( ssl->conf->mfl_code == MBEDTLS_SSL_MAX_FRAG_LEN_NONE ) - return( 0 ); - - MBEDTLS_SSL_DEBUG_MSG( 3, - ( "client hello, adding max_fragment_length extension" ) ); - - MBEDTLS_SSL_CHK_BUF_PTR( p, end, 5 ); - - *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->conf->mfl_code; - - *olen = 5; - - return( 0 ); -} -#endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */ - -#if defined(MBEDTLS_SSL_TRUNCATED_HMAC) -static int ssl_write_truncated_hmac_ext( mbedtls_ssl_context *ssl, - unsigned char *buf, - const unsigned char *end, - size_t *olen ) -{ - unsigned char *p = buf; - - *olen = 0; - - if( ssl->conf->trunc_hmac == MBEDTLS_SSL_TRUNC_HMAC_DISABLED ) - return( 0 ); - - MBEDTLS_SSL_DEBUG_MSG( 3, - ( "client hello, adding truncated_hmac extension" ) ); - - MBEDTLS_SSL_CHK_BUF_PTR( p, end, 4 ); - - *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; - - return( 0 ); -} -#endif /* MBEDTLS_SSL_TRUNCATED_HMAC */ - -#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC) -static int ssl_write_encrypt_then_mac_ext( mbedtls_ssl_context *ssl, - unsigned char *buf, - const unsigned char *end, - size_t *olen ) -{ - unsigned char *p = buf; - - *olen = 0; - - if( ssl->conf->encrypt_then_mac == MBEDTLS_SSL_ETM_DISABLED || - ssl->conf->max_minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 ) - return( 0 ); - - MBEDTLS_SSL_DEBUG_MSG( 3, - ( "client hello, adding encrypt_then_mac extension" ) ); - - MBEDTLS_SSL_CHK_BUF_PTR( p, end, 4 ); - - *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; - - return( 0 ); -} -#endif /* MBEDTLS_SSL_ENCRYPT_THEN_MAC */ - -#if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET) -static int ssl_write_extended_ms_ext( mbedtls_ssl_context *ssl, - unsigned char *buf, - const unsigned char *end, - size_t *olen ) -{ - unsigned char *p = buf; - - *olen = 0; - - if( ssl->conf->extended_ms == MBEDTLS_SSL_EXTENDED_MS_DISABLED || - ssl->conf->max_minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 ) - return( 0 ); - - MBEDTLS_SSL_DEBUG_MSG( 3, - ( "client hello, adding extended_master_secret extension" ) ); - - MBEDTLS_SSL_CHK_BUF_PTR( p, end, 4 ); - - *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; - - return( 0 ); -} -#endif /* MBEDTLS_SSL_EXTENDED_MASTER_SECRET */ - -#if defined(MBEDTLS_SSL_SESSION_TICKETS) -static int ssl_write_session_ticket_ext( mbedtls_ssl_context *ssl, - unsigned char *buf, - const unsigned char *end, - size_t *olen ) -{ - unsigned char *p = buf; - size_t tlen = ssl->session_negotiate->ticket_len; - - *olen = 0; - - if( ssl->conf->session_tickets == MBEDTLS_SSL_SESSION_TICKETS_DISABLED ) - return( 0 ); - - MBEDTLS_SSL_DEBUG_MSG( 3, - ( "client hello, adding session ticket extension" ) ); - - /* The addition is safe here since the ticket length is 16 bit. */ - MBEDTLS_SSL_CHK_BUF_PTR( p, end, 4 + tlen ); - - *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SESSION_TICKET >> 8 ) & 0xFF ); - *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SESSION_TICKET ) & 0xFF ); - - *p++ = (unsigned char)( ( tlen >> 8 ) & 0xFF ); - *p++ = (unsigned char)( ( tlen ) & 0xFF ); - - *olen = 4; - - if( ssl->session_negotiate->ticket == NULL || tlen == 0 ) - return( 0 ); - - MBEDTLS_SSL_DEBUG_MSG( 3, - ( "sending session ticket of length %d", tlen ) ); - - memcpy( p, ssl->session_negotiate->ticket, tlen ); - - *olen += tlen; - - return( 0 ); -} -#endif /* MBEDTLS_SSL_SESSION_TICKETS */ - -#if defined(MBEDTLS_SSL_ALPN) -static int ssl_write_alpn_ext( mbedtls_ssl_context *ssl, - unsigned char *buf, - const unsigned char *end, - size_t *olen ) -{ - unsigned char *p = buf; - size_t alpnlen = 0; - const char **cur; - - *olen = 0; - - if( ssl->conf->alpn_list == NULL ) - return( 0 ); - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, adding alpn extension" ) ); - - for( cur = ssl->conf->alpn_list; *cur != NULL; cur++ ) - alpnlen += strlen( *cur ) + 1; - - MBEDTLS_SSL_CHK_BUF_PTR( p, end, 6 + alpnlen ); - - *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_ALPN >> 8 ) & 0xFF ); - *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_ALPN ) & 0xFF ); - - /* - * opaque ProtocolName<1..2^8-1>; - * - * struct { - * ProtocolName protocol_name_list<2..2^16-1> - * } ProtocolNameList; - */ - - /* Skip writing extension and list length for now */ - p += 4; - - for( cur = ssl->conf->alpn_list; *cur != NULL; cur++ ) - { - /* - * mbedtls_ssl_conf_set_alpn_protocols() checked that the length of - * protocol names is less than 255. - */ - *p = (unsigned char)strlen( *cur ); - memcpy( p + 1, *cur, *p ); - p += 1 + *p; - } - - *olen = p - buf; - - /* List length = olen - 2 (ext_type) - 2 (ext_len) - 2 (list_len) */ - buf[4] = (unsigned char)( ( ( *olen - 6 ) >> 8 ) & 0xFF ); - buf[5] = (unsigned char)( ( ( *olen - 6 ) ) & 0xFF ); - - /* Extension length = olen - 2 (ext_type) - 2 (ext_len) */ - buf[2] = (unsigned char)( ( ( *olen - 4 ) >> 8 ) & 0xFF ); - buf[3] = (unsigned char)( ( ( *olen - 4 ) ) & 0xFF ); - - return( 0 ); -} -#endif /* MBEDTLS_SSL_ALPN */ - -/* - * Generate random bytes for ClientHello - */ -static int ssl_generate_random( mbedtls_ssl_context *ssl ) -{ - int ret; - unsigned char *p = ssl->handshake->randbytes; -#if defined(MBEDTLS_HAVE_TIME) - mbedtls_time_t t; -#endif - - /* - * When responding to a verify request, MUST reuse random (RFC 6347 4.2.1) - */ -#if defined(MBEDTLS_SSL_PROTO_DTLS) - if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM && - ssl->handshake->verify_cookie != NULL ) - { - return( 0 ); - } -#endif - -#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, ( "client hello, current time: %lu", 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 ); - - return( 0 ); -} - -/** - * \brief Validate cipher suite against config in SSL context. - * - * \param suite_info cipher suite to validate - * \param ssl SSL context - * \param min_minor_ver Minimal minor version to accept a cipher suite - * \param max_minor_ver Maximal minor version to accept a cipher suite - * - * \return 0 if valid, else 1 - */ -static int ssl_validate_ciphersuite( - const mbedtls_ssl_ciphersuite_t * suite_info, - const mbedtls_ssl_context * ssl, - int min_minor_ver, int max_minor_ver ) -{ - (void) ssl; - if( suite_info == NULL ) - return( 1 ); - - if( suite_info->min_minor_ver > max_minor_ver || - suite_info->max_minor_ver < min_minor_ver ) - return( 1 ); - -#if defined(MBEDTLS_SSL_PROTO_DTLS) - if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM && - ( suite_info->flags & MBEDTLS_CIPHERSUITE_NODTLS ) ) - return( 1 ); -#endif - -#if defined(MBEDTLS_ARC4_C) - if( ssl->conf->arc4_disabled == MBEDTLS_SSL_ARC4_DISABLED && - suite_info->cipher == MBEDTLS_CIPHER_ARC4_128 ) - return( 1 ); -#endif - -#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED) - if( suite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECJPAKE && - mbedtls_ecjpake_check( &ssl->handshake->ecjpake_ctx ) != 0 ) - return( 1 ); -#endif - - return( 0 ); -} - -static int ssl_write_client_hello( mbedtls_ssl_context *ssl ) -{ - int ret; - size_t i, n, olen, ext_len = 0; - - unsigned char *buf; - unsigned char *p, *q; - const unsigned char *end; - - unsigned char offer_compress; - const int *ciphersuites; - const mbedtls_ssl_ciphersuite_t *ciphersuite_info; -#if defined(MBEDTLS_ECDH_C) || defined(MBEDTLS_ECDSA_C) || \ - defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED) - int uses_ec = 0; -#endif - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write client hello" ) ); - - if( ssl->conf->f_rng == NULL ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "no RNG provided") ); - return( MBEDTLS_ERR_SSL_NO_RNG ); - } - -#if defined(MBEDTLS_SSL_RENEGOTIATION) - if( ssl->renego_status == MBEDTLS_SSL_INITIAL_HANDSHAKE ) -#endif - { - ssl->major_ver = ssl->conf->min_major_ver; - ssl->minor_ver = ssl->conf->min_minor_ver; - } - - if( ssl->conf->max_major_ver == 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, - ( "configured max major version is invalid, consider using mbedtls_ssl_config_defaults()" ) ); - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - } - - buf = ssl->out_msg; - end = buf + MBEDTLS_SSL_OUT_CONTENT_LEN; - - /* - * Check if there's enough space for the first part of the ClientHello - * consisting of the 38 bytes described below, the session identifier (at - * most 32 bytes) and its length (1 byte). - * - * Use static upper bounds instead of the actual values - * to allow the compiler to optimize this away. - */ - MBEDTLS_SSL_CHK_BUF_PTR( buf, end, 38 + 1 + 32 ); - - /* - * The 38 first bytes of the ClientHello: - * 0 . 0 handshake type (written later) - * 1 . 3 handshake length (written later) - * 4 . 5 highest version supported - * 6 . 9 current UNIX time - * 10 . 37 random bytes - * - * The current UNIX time (4 bytes) and following 28 random bytes are written - * by ssl_generate_random() into ssl->handshake->randbytes buffer and then - * copied from there into the output buffer. - */ - - p = buf + 4; - mbedtls_ssl_write_version( ssl->conf->max_major_ver, - ssl->conf->max_minor_ver, - ssl->conf->transport, p ); - p += 2; - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, max version: [%d:%d]", - buf[4], buf[5] ) ); - - if( ( ret = ssl_generate_random( ssl ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "ssl_generate_random", ret ); - return( ret ); - } - - memcpy( p, ssl->handshake->randbytes, 32 ); - MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, random bytes", p, 32 ); - p += 32; - - /* - * 38 . 38 session id length - * 39 . 39+n session id - * 39+n . 39+n DTLS only: cookie length (1 byte) - * 40+n . .. DTLS only: cookie - * .. . .. ciphersuitelist length (2 bytes) - * .. . .. ciphersuitelist - * .. . .. compression methods length (1 byte) - * .. . .. compression methods - * .. . .. extensions length (2 bytes) - * .. . .. extensions - */ - n = ssl->session_negotiate->id_len; - - if( n < 16 || n > 32 || -#if defined(MBEDTLS_SSL_RENEGOTIATION) - ssl->renego_status != MBEDTLS_SSL_INITIAL_HANDSHAKE || -#endif - ssl->handshake->resume == 0 ) - { - n = 0; - } - -#if defined(MBEDTLS_SSL_SESSION_TICKETS) - /* - * RFC 5077 section 3.4: "When presenting a ticket, the client MAY - * generate and include a Session ID in the TLS ClientHello." - */ -#if defined(MBEDTLS_SSL_RENEGOTIATION) - if( ssl->renego_status == MBEDTLS_SSL_INITIAL_HANDSHAKE ) -#endif - { - if( ssl->session_negotiate->ticket != NULL && - ssl->session_negotiate->ticket_len != 0 ) - { - ret = ssl->conf->f_rng( ssl->conf->p_rng, - ssl->session_negotiate->id, 32 ); - - if( ret != 0 ) - return( ret ); - - ssl->session_negotiate->id_len = n = 32; - } - } -#endif /* MBEDTLS_SSL_SESSION_TICKETS */ - - /* - * The first check of the output buffer size above ( - * MBEDTLS_SSL_CHK_BUF_PTR( buf, end, 38 + 1 + 32 );) - * has checked that there is enough space in the output buffer for the - * session identifier length byte and the session identifier (n <= 32). - */ - *p++ = (unsigned char) n; - - for( i = 0; i < n; i++ ) - *p++ = ssl->session_negotiate->id[i]; - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, session id len.: %d", n ) ); - MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, session id", buf + 39, n ); - - /* - * With 'n' being the length of the session identifier - * - * 39+n . 39+n DTLS only: cookie length (1 byte) - * 40+n . .. DTLS only: cookie - * .. . .. ciphersuitelist length (2 bytes) - * .. . .. ciphersuitelist - * .. . .. compression methods length (1 byte) - * .. . .. compression methods - * .. . .. extensions length (2 bytes) - * .. . .. extensions - */ - - /* - * DTLS cookie - */ -#if defined(MBEDTLS_SSL_PROTO_DTLS) - if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) - { - MBEDTLS_SSL_CHK_BUF_PTR( p, end, 1 ); - - if( ssl->handshake->verify_cookie == NULL ) - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "no verify cookie to send" ) ); - *p++ = 0; - } - else - { - MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, cookie", - ssl->handshake->verify_cookie, - ssl->handshake->verify_cookie_len ); - - *p++ = ssl->handshake->verify_cookie_len; - - MBEDTLS_SSL_CHK_BUF_PTR( p, end, - ssl->handshake->verify_cookie_len ); - memcpy( p, ssl->handshake->verify_cookie, - ssl->handshake->verify_cookie_len ); - p += ssl->handshake->verify_cookie_len; - } - } -#endif - - /* - * Ciphersuite list - */ - ciphersuites = ssl->conf->ciphersuite_list[ssl->minor_ver]; - - /* Skip writing ciphersuite length for now */ - n = 0; - q = p; - - MBEDTLS_SSL_CHK_BUF_PTR( p, end, 2 ); - p += 2; - - for( i = 0; ciphersuites[i] != 0; i++ ) - { - ciphersuite_info = mbedtls_ssl_ciphersuite_from_id( ciphersuites[i] ); - - if( ssl_validate_ciphersuite( ciphersuite_info, ssl, - ssl->conf->min_minor_ver, - ssl->conf->max_minor_ver ) != 0 ) - continue; - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, add ciphersuite: %04x", - ciphersuites[i] ) ); - -#if defined(MBEDTLS_ECDH_C) || defined(MBEDTLS_ECDSA_C) || \ - defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED) - uses_ec |= mbedtls_ssl_ciphersuite_uses_ec( ciphersuite_info ); -#endif - - MBEDTLS_SSL_CHK_BUF_PTR( p, end, 2 ); - - n++; - *p++ = (unsigned char)( ciphersuites[i] >> 8 ); - *p++ = (unsigned char)( ciphersuites[i] ); - } - - MBEDTLS_SSL_DEBUG_MSG( 3, - ( "client hello, got %d ciphersuites (excluding SCSVs)", n ) ); - - /* - * Add TLS_EMPTY_RENEGOTIATION_INFO_SCSV - */ -#if defined(MBEDTLS_SSL_RENEGOTIATION) - if( ssl->renego_status == MBEDTLS_SSL_INITIAL_HANDSHAKE ) -#endif - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "adding EMPTY_RENEGOTIATION_INFO_SCSV" ) ); - MBEDTLS_SSL_CHK_BUF_PTR( p, end, 2 ); - *p++ = (unsigned char)( MBEDTLS_SSL_EMPTY_RENEGOTIATION_INFO >> 8 ); - *p++ = (unsigned char)( MBEDTLS_SSL_EMPTY_RENEGOTIATION_INFO ); - n++; - } - - /* Some versions of OpenSSL don't handle it correctly if not at end */ -#if defined(MBEDTLS_SSL_FALLBACK_SCSV) - if( ssl->conf->fallback == MBEDTLS_SSL_IS_FALLBACK ) - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "adding FALLBACK_SCSV" ) ); - - MBEDTLS_SSL_CHK_BUF_PTR( p, end, 2 ); - *p++ = (unsigned char)( MBEDTLS_SSL_FALLBACK_SCSV_VALUE >> 8 ); - *p++ = (unsigned char)( MBEDTLS_SSL_FALLBACK_SCSV_VALUE ); - n++; - } -#endif - - *q++ = (unsigned char)( n >> 7 ); - *q++ = (unsigned char)( n << 1 ); - -#if defined(MBEDTLS_ZLIB_SUPPORT) - offer_compress = 1; -#else - offer_compress = 0; -#endif - - /* - * We don't support compression with DTLS right now: if many records come - * in the same datagram, uncompressing one could overwrite the next one. - * We don't want to add complexity for handling that case unless there is - * an actual need for it. - */ -#if defined(MBEDTLS_SSL_PROTO_DTLS) - if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) - offer_compress = 0; -#endif - - if( offer_compress ) - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, compress len.: %d", 2 ) ); - MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, compress alg.: %d %d", - MBEDTLS_SSL_COMPRESS_DEFLATE, - MBEDTLS_SSL_COMPRESS_NULL ) ); - - MBEDTLS_SSL_CHK_BUF_PTR( p, end, 3 ); - *p++ = 2; - *p++ = MBEDTLS_SSL_COMPRESS_DEFLATE; - *p++ = MBEDTLS_SSL_COMPRESS_NULL; - } - else - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, compress len.: %d", 1 ) ); - MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, compress alg.: %d", - MBEDTLS_SSL_COMPRESS_NULL ) ); - - MBEDTLS_SSL_CHK_BUF_PTR( p, end, 2 ); - *p++ = 1; - *p++ = MBEDTLS_SSL_COMPRESS_NULL; - } - - /* First write extensions, then the total length */ - - MBEDTLS_SSL_CHK_BUF_PTR( p, end, 2 ); - -#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION) - if( ( ret = ssl_write_hostname_ext( ssl, p + 2 + ext_len, - end, &olen ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "ssl_write_hostname_ext", ret ); - return( ret ); - } - ext_len += olen; -#endif - - /* Note that TLS_EMPTY_RENEGOTIATION_INFO_SCSV is always added - * even if MBEDTLS_SSL_RENEGOTIATION is not defined. */ -#if defined(MBEDTLS_SSL_RENEGOTIATION) - if( ( ret = ssl_write_renegotiation_ext( ssl, p + 2 + ext_len, - end, &olen ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "ssl_write_renegotiation_ext", ret ); - return( ret ); - } - ext_len += olen; -#endif - -#if defined(MBEDTLS_SSL_PROTO_TLS1_2) && \ - defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED) - if( ( ret = ssl_write_signature_algorithms_ext( ssl, p + 2 + ext_len, - end, &olen ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "ssl_write_signature_algorithms_ext", ret ); - return( ret ); - } - ext_len += olen; -#endif - -#if defined(MBEDTLS_ECDH_C) || defined(MBEDTLS_ECDSA_C) || \ - defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED) - if( uses_ec ) - { - if( ( ret = ssl_write_supported_elliptic_curves_ext( ssl, p + 2 + ext_len, - end, &olen ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "ssl_write_supported_elliptic_curves_ext", ret ); - return( ret ); - } - ext_len += olen; - - if( ( ret = ssl_write_supported_point_formats_ext( ssl, p + 2 + ext_len, - end, &olen ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "ssl_write_supported_point_formats_ext", ret ); - return( ret ); - } - ext_len += olen; - } -#endif - -#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED) - if( ( ret = ssl_write_ecjpake_kkpp_ext( ssl, p + 2 + ext_len, - end, &olen ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "ssl_write_ecjpake_kkpp_ext", ret ); - return( ret ); - } - ext_len += olen; -#endif - -#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH) - if( ( ret = ssl_write_max_fragment_length_ext( ssl, p + 2 + ext_len, - end, &olen ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "ssl_write_max_fragment_length_ext", ret ); - return( ret ); - } - ext_len += olen; -#endif - -#if defined(MBEDTLS_SSL_TRUNCATED_HMAC) - if( ( ret = ssl_write_truncated_hmac_ext( ssl, p + 2 + ext_len, - end, &olen ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "ssl_write_truncated_hmac_ext", ret ); - return( ret ); - } - ext_len += olen; -#endif - -#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC) - if( ( ret = ssl_write_encrypt_then_mac_ext( ssl, p + 2 + ext_len, - end, &olen ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "ssl_write_encrypt_then_mac_ext", ret ); - return( ret ); - } - ext_len += olen; -#endif - -#if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET) - if( ( ret = ssl_write_extended_ms_ext( ssl, p + 2 + ext_len, - end, &olen ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "ssl_write_extended_ms_ext", ret ); - return( ret ); - } - ext_len += olen; -#endif - -#if defined(MBEDTLS_SSL_ALPN) - if( ( ret = ssl_write_alpn_ext( ssl, p + 2 + ext_len, - end, &olen ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "ssl_write_alpn_ext", ret ); - return( ret ); - } - ext_len += olen; -#endif - -#if defined(MBEDTLS_SSL_SESSION_TICKETS) - if( ( ret = ssl_write_session_ticket_ext( ssl, p + 2 + ext_len, - end, &olen ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "ssl_write_session_ticket_ext", ret ); - return( ret ); - } - ext_len += olen; -#endif - - /* olen unused if all extensions are disabled */ - ((void) olen); - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, total extension length: %d", - ext_len ) ); - - if( ext_len > 0 ) - { - /* No need to check for space here, because the extension - * writing functions already took care of that. */ - *p++ = (unsigned char)( ( ext_len >> 8 ) & 0xFF ); - *p++ = (unsigned char)( ( ext_len ) & 0xFF ); - p += ext_len; - } - - ssl->out_msglen = p - buf; - ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE; - ssl->out_msg[0] = MBEDTLS_SSL_HS_CLIENT_HELLO; - - 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 client hello" ) ); - - return( 0 ); -} - -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 * 2 || - buf[0] != ssl->verify_data_len * 2 || - mbedtls_ssl_safer_memcmp( buf + 1, - ssl->own_verify_data, ssl->verify_data_len ) != 0 || - mbedtls_ssl_safer_memcmp( buf + 1 + ssl->verify_data_len, - 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_SERVER_HELLO ); - } - } - else -#endif /* MBEDTLS_SSL_RENEGOTIATION */ - { - if( len != 1 || buf[0] != 0x00 ) - { - 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_SERVER_HELLO ); - } - - ssl->secure_renegotiation = MBEDTLS_SSL_SECURE_RENEGOTIATION; - } - - return( 0 ); -} - -#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 ) -{ - /* - * server should use the extension only if we did, - * and if so the server's value should match ours (and len is always 1) - */ - if( ssl->conf->mfl_code == MBEDTLS_SSL_MAX_FRAG_LEN_NONE || - len != 1 || - buf[0] != ssl->conf->mfl_code ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, - ( "non-matching max fragment length extension" ) ); - mbedtls_ssl_send_alert_message( - ssl, - MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO ); - } - - return( 0 ); -} -#endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */ - -#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( ssl->conf->trunc_hmac == MBEDTLS_SSL_TRUNC_HMAC_DISABLED || - len != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, - ( "non-matching truncated HMAC extension" ) ); - mbedtls_ssl_send_alert_message( - ssl, - MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO ); - } - - ((void) buf); - - 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( ssl->conf->encrypt_then_mac == MBEDTLS_SSL_ETM_DISABLED || - ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 || - len != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, - ( "non-matching encrypt-then-MAC extension" ) ); - mbedtls_ssl_send_alert_message( - ssl, - MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO ); - } - - ((void) buf); - - 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( ssl->conf->extended_ms == MBEDTLS_SSL_EXTENDED_MS_DISABLED || - ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 || - len != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, - ( "non-matching extended master secret extension" ) ); - mbedtls_ssl_send_alert_message( - ssl, - MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO ); - } - - ((void) buf); - - 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, - const unsigned char *buf, - size_t len ) -{ - if( ssl->conf->session_tickets == MBEDTLS_SSL_SESSION_TICKETS_DISABLED || - len != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, - ( "non-matching session ticket extension" ) ); - mbedtls_ssl_send_alert_message( - ssl, - MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO ); - } - - ((void) buf); - - ssl->handshake->new_session_ticket = 1; - - return( 0 ); -} -#endif /* MBEDTLS_SSL_SESSION_TICKETS */ - -#if defined(MBEDTLS_ECDH_C) || defined(MBEDTLS_ECDSA_C) || \ - defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED) -static int ssl_parse_supported_point_formats_ext( 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 server 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_SERVER_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++; - } - - MBEDTLS_SSL_DEBUG_MSG( 1, ( "no point format in common" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO ); -} -#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; - - if( ssl->transform_negotiate->ciphersuite_info->key_exchange != - MBEDTLS_KEY_EXCHANGE_ECJPAKE ) - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "skip ecjpake kkpp extension" ) ); - return( 0 ); - } - - /* If we got here, we no longer need our cached extension */ - mbedtls_free( ssl->handshake->ecjpake_cache ); - ssl->handshake->ecjpake_cache = NULL; - ssl->handshake->ecjpake_cache_len = 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_HANDSHAKE_FAILURE ); - return( ret ); - } - - return( 0 ); -} -#endif /* MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */ - -#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, name_len; - const char **p; - - /* If we didn't send it, the server shouldn't send it */ - if( ssl->conf->alpn_list == NULL ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "non-matching ALPN extension" ) ); - mbedtls_ssl_send_alert_message( - ssl, - MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO ); - } - - /* - * opaque ProtocolName<1..2^8-1>; - * - * struct { - * ProtocolName protocol_name_list<2..2^16-1> - * } ProtocolNameList; - * - * the "ProtocolNameList" MUST contain exactly one "ProtocolName" - */ - - /* 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_SERVER_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_SERVER_HELLO ); - } - - name_len = buf[2]; - if( name_len != list_len - 1 ) - { - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO ); - } - - /* Check that the server chosen protocol was in our list and save it */ - for( p = ssl->conf->alpn_list; *p != NULL; p++ ) - { - if( name_len == strlen( *p ) && - memcmp( buf + 3, *p, name_len ) == 0 ) - { - ssl->alpn_chosen = *p; - return( 0 ); - } - } - - MBEDTLS_SSL_DEBUG_MSG( 1, ( "ALPN extension: no matching protocol" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO ); -} -#endif /* MBEDTLS_SSL_ALPN */ - -/* - * Parse HelloVerifyRequest. Only called after verifying the HS type. - */ -#if defined(MBEDTLS_SSL_PROTO_DTLS) -static int ssl_parse_hello_verify_request( mbedtls_ssl_context *ssl ) -{ - const unsigned char *p = ssl->in_msg + mbedtls_ssl_hs_hdr_len( ssl ); - int major_ver, minor_ver; - unsigned char cookie_len; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse hello verify request" ) ); - - /* Check that there is enough room for: - * - 2 bytes of version - * - 1 byte of cookie_len - */ - if( mbedtls_ssl_hs_hdr_len( ssl ) + 3 > ssl->in_msglen ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, - ( "incoming HelloVerifyRequest message is too short" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO ); - } - - /* - * struct { - * ProtocolVersion server_version; - * opaque cookie<0..2^8-1>; - * } HelloVerifyRequest; - */ - MBEDTLS_SSL_DEBUG_BUF( 3, "server version", p, 2 ); - mbedtls_ssl_read_version( &major_ver, &minor_ver, ssl->conf->transport, p ); - p += 2; - - /* - * Since the RFC is not clear on this point, accept DTLS 1.0 (TLS 1.1) - * even is lower than our min version. - */ - if( major_ver < MBEDTLS_SSL_MAJOR_VERSION_3 || - minor_ver < MBEDTLS_SSL_MINOR_VERSION_2 || - major_ver > ssl->conf->max_major_ver || - minor_ver > ssl->conf->max_minor_ver ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server version" ) ); - - 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 ); - } - - cookie_len = *p++; - if( ( ssl->in_msg + ssl->in_msglen ) - p < cookie_len ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, - ( "cookie length does not match incoming message size" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO ); - } - MBEDTLS_SSL_DEBUG_BUF( 3, "cookie", p, cookie_len ); - - mbedtls_free( ssl->handshake->verify_cookie ); - - ssl->handshake->verify_cookie = mbedtls_calloc( 1, cookie_len ); - if( ssl->handshake->verify_cookie == NULL ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "alloc failed (%d bytes)", cookie_len ) ); - return( MBEDTLS_ERR_SSL_ALLOC_FAILED ); - } - - memcpy( ssl->handshake->verify_cookie, p, cookie_len ); - ssl->handshake->verify_cookie_len = cookie_len; - - /* Start over at ClientHello */ - ssl->state = MBEDTLS_SSL_CLIENT_HELLO; - mbedtls_ssl_reset_checksum( ssl ); - - mbedtls_ssl_recv_flight_completed( ssl ); - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse hello verify request" ) ); - - return( 0 ); -} -#endif /* MBEDTLS_SSL_PROTO_DTLS */ - -static int ssl_parse_server_hello( mbedtls_ssl_context *ssl ) -{ - int ret, i; - size_t n; - size_t ext_len; - unsigned char *buf, *ext; - unsigned char comp; -#if defined(MBEDTLS_ZLIB_SUPPORT) - int accept_comp; -#endif -#if defined(MBEDTLS_SSL_RENEGOTIATION) - int renegotiation_info_seen = 0; -#endif - int handshake_failure = 0; - const mbedtls_ssl_ciphersuite_t *suite_info; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse server hello" ) ); - - buf = ssl->in_msg; - - if( ( ret = mbedtls_ssl_read_record( ssl, 1 ) ) != 0 ) - { - /* No alert on a read error. */ - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_read_record", ret ); - return( ret ); - } - - if( ssl->in_msgtype != MBEDTLS_SSL_MSG_HANDSHAKE ) - { -#if defined(MBEDTLS_SSL_RENEGOTIATION) - if( ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS ) - { - ssl->renego_records_seen++; - - if( ssl->conf->renego_max_records >= 0 && - ssl->renego_records_seen > ssl->conf->renego_max_records ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, - ( "renegotiation requested, but not honored by server" ) ); - return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE ); - } - - MBEDTLS_SSL_DEBUG_MSG( 1, - ( "non-handshake message during renegotiation" ) ); - - ssl->keep_current_message = 1; - return( MBEDTLS_ERR_SSL_WAITING_SERVER_HELLO_RENEGO ); - } -#endif /* MBEDTLS_SSL_RENEGOTIATION */ - - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server hello message" ) ); - mbedtls_ssl_send_alert_message( - ssl, - MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_UNEXPECTED_MESSAGE ); - return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE ); - } - -#if defined(MBEDTLS_SSL_PROTO_DTLS) - if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) - { - if( buf[0] == MBEDTLS_SSL_HS_HELLO_VERIFY_REQUEST ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "received hello verify request" ) ); - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse server hello" ) ); - return( ssl_parse_hello_verify_request( ssl ) ); - } - else - { - /* We made it through the verification process */ - mbedtls_free( ssl->handshake->verify_cookie ); - ssl->handshake->verify_cookie = NULL; - ssl->handshake->verify_cookie_len = 0; - } - } -#endif /* MBEDTLS_SSL_PROTO_DTLS */ - - if( ssl->in_hslen < 38 + mbedtls_ssl_hs_hdr_len( ssl ) || - buf[0] != MBEDTLS_SSL_HS_SERVER_HELLO ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server 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_SERVER_HELLO ); - } - - /* - * 0 . 1 server_version - * 2 . 33 random (maybe including 4 bytes of Unix time) - * 34 . 34 session_id length = n - * 35 . 34+n session_id - * 35+n . 36+n cipher_suite - * 37+n . 37+n compression_method - * - * 38+n . 39+n extensions length (optional) - * 40+n . .. extensions - */ - buf += mbedtls_ssl_hs_hdr_len( ssl ); - - MBEDTLS_SSL_DEBUG_BUF( 3, "server hello, version", buf + 0, 2 ); - mbedtls_ssl_read_version( &ssl->major_ver, &ssl->minor_ver, - ssl->conf->transport, buf + 0 ); - - if( ssl->major_ver < ssl->conf->min_major_ver || - ssl->minor_ver < ssl->conf->min_minor_ver || - ssl->major_ver > ssl->conf->max_major_ver || - ssl->minor_ver > ssl->conf->max_minor_ver ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, - ( "server version out of bounds - min: [%d:%d], server: [%d:%d], max: [%d:%d]", - ssl->conf->min_major_ver, - ssl->conf->min_minor_ver, - ssl->major_ver, ssl->minor_ver, - ssl->conf->max_major_ver, - ssl->conf->max_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 ); - } - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, current time: %lu", - ( (uint32_t) buf[2] << 24 ) | - ( (uint32_t) buf[3] << 16 ) | - ( (uint32_t) buf[4] << 8 ) | - ( (uint32_t) buf[5] ) ) ); - - memcpy( ssl->handshake->randbytes + 32, buf + 2, 32 ); - - n = buf[34]; - - MBEDTLS_SSL_DEBUG_BUF( 3, "server hello, random bytes", buf + 2, 32 ); - - if( n > 32 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server 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_SERVER_HELLO ); - } - - if( ssl->in_hslen > mbedtls_ssl_hs_hdr_len( ssl ) + 39 + n ) - { - ext_len = ( ( buf[38 + n] << 8 ) - | ( buf[39 + n] ) ); - - if( ( ext_len > 0 && ext_len < 4 ) || - ssl->in_hslen != mbedtls_ssl_hs_hdr_len( ssl ) + 40 + n + ext_len ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server 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_SERVER_HELLO ); - } - } - else if( ssl->in_hslen == mbedtls_ssl_hs_hdr_len( ssl ) + 38 + n ) - { - ext_len = 0; - } - else - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server 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_SERVER_HELLO ); - } - - /* ciphersuite (used later) */ - i = ( buf[35 + n] << 8 ) | buf[36 + n]; - - /* - * Read and check compression - */ - comp = buf[37 + n]; - -#if defined(MBEDTLS_ZLIB_SUPPORT) - /* See comments in ssl_write_client_hello() */ -#if defined(MBEDTLS_SSL_PROTO_DTLS) - if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) - accept_comp = 0; - else -#endif - accept_comp = 1; - - if( comp != MBEDTLS_SSL_COMPRESS_NULL && - ( comp != MBEDTLS_SSL_COMPRESS_DEFLATE || accept_comp == 0 ) ) -#else /* MBEDTLS_ZLIB_SUPPORT */ - if( comp != MBEDTLS_SSL_COMPRESS_NULL ) -#endif/* MBEDTLS_ZLIB_SUPPORT */ - { - MBEDTLS_SSL_DEBUG_MSG( 1, - ( "server hello, bad compression: %d", comp ) ); - mbedtls_ssl_send_alert_message( - ssl, - MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER ); - return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE ); - } - - /* - * Initialize update checksum functions - */ - ssl->transform_negotiate->ciphersuite_info = - mbedtls_ssl_ciphersuite_from_id( i ); - - if( ssl->transform_negotiate->ciphersuite_info == NULL ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, - ( "ciphersuite info for %04x not found", i ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_INTERNAL_ERROR ); - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - } - - mbedtls_ssl_optimize_checksum( ssl, - ssl->transform_negotiate->ciphersuite_info ); - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, session id len.: %d", n ) ); - MBEDTLS_SSL_DEBUG_BUF( 3, "server hello, session id", buf + 35, n ); - - /* - * Check if the session can be resumed - */ - if( ssl->handshake->resume == 0 || n == 0 || -#if defined(MBEDTLS_SSL_RENEGOTIATION) - ssl->renego_status != MBEDTLS_SSL_INITIAL_HANDSHAKE || -#endif - ssl->session_negotiate->ciphersuite != i || - ssl->session_negotiate->compression != comp || - ssl->session_negotiate->id_len != n || - memcmp( ssl->session_negotiate->id, buf + 35, n ) != 0 ) - { - ssl->state++; - ssl->handshake->resume = 0; -#if defined(MBEDTLS_HAVE_TIME) - ssl->session_negotiate->start = mbedtls_time( NULL ); -#endif - ssl->session_negotiate->ciphersuite = i; - ssl->session_negotiate->compression = comp; - ssl->session_negotiate->id_len = n; - memcpy( ssl->session_negotiate->id, buf + 35, n ); - } - else - { - 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 ); - mbedtls_ssl_send_alert_message( - ssl, - MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_INTERNAL_ERROR ); - return( ret ); - } - } - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "%s session has been resumed", - ssl->handshake->resume ? "a" : "no" ) ); - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, chosen ciphersuite: %04x", i ) ); - MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, compress alg.: %d", - buf[37 + n] ) ); - - /* - * Perform cipher suite validation in same way as in ssl_write_client_hello. - */ - i = 0; - while( 1 ) - { - if( ssl->conf->ciphersuite_list[ssl->minor_ver][i] == 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server 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_SERVER_HELLO ); - } - - if( ssl->conf->ciphersuite_list[ssl->minor_ver][i++] == - ssl->session_negotiate->ciphersuite ) - { - break; - } - } - - suite_info = mbedtls_ssl_ciphersuite_from_id( - ssl->session_negotiate->ciphersuite ); - if( ssl_validate_ciphersuite( suite_info, ssl, ssl->minor_ver, - ssl->minor_ver ) != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server 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_SERVER_HELLO ); - } - - MBEDTLS_SSL_DEBUG_MSG( 3, - ( "server hello, chosen ciphersuite: %s", suite_info->name ) ); - -#if defined(MBEDTLS_SSL__ECP_RESTARTABLE) - if( suite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA && - ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 ) - { - ssl->handshake->ecrs_enabled = 1; - } -#endif - - if( comp != MBEDTLS_SSL_COMPRESS_NULL -#if defined(MBEDTLS_ZLIB_SUPPORT) - && comp != MBEDTLS_SSL_COMPRESS_DEFLATE -#endif - ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server 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_SERVER_HELLO ); - } - ssl->session_negotiate->compression = comp; - - ext = buf + 40 + n; - - MBEDTLS_SSL_DEBUG_MSG( 2, - ( "server hello, total extension length: %d", ext_len ) ); - - while( ext_len ) - { - unsigned int ext_id = ( ( ext[0] << 8 ) - | ( ext[1] ) ); - unsigned int ext_size = ( ( ext[2] << 8 ) - | ( ext[3] ) ); - - if( ext_size + 4 > ext_len ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server 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_SERVER_HELLO ); - } - - switch( ext_id ) - { - case MBEDTLS_TLS_EXT_RENEGOTIATION_INFO: - MBEDTLS_SSL_DEBUG_MSG( 3, ( "found renegotiation extension" ) ); -#if defined(MBEDTLS_SSL_RENEGOTIATION) - renegotiation_info_seen = 1; -#endif - - if( ( ret = ssl_parse_renegotiation_info( ssl, ext + 4, - ext_size ) ) != 0 ) - return( ret ); - - break; - -#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH) - case MBEDTLS_TLS_EXT_MAX_FRAGMENT_LENGTH: - MBEDTLS_SSL_DEBUG_MSG( 3, - ( "found max_fragment_length extension" ) ); - - if( ( ret = ssl_parse_max_fragment_length_ext( ssl, - ext + 4, ext_size ) ) != 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" ) ); - - if( ( ret = ssl_parse_truncated_hmac_ext( ssl, - ext + 4, ext_size ) ) != 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" ) ); - - if( ( ret = ssl_parse_encrypt_then_mac_ext( ssl, - ext + 4, ext_size ) ) != 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" ) ); - - if( ( ret = ssl_parse_extended_ms_ext( ssl, - ext + 4, ext_size ) ) != 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" ) ); - - if( ( ret = ssl_parse_session_ticket_ext( ssl, - ext + 4, ext_size ) ) != 0 ) - { - return( ret ); - } - - break; -#endif /* MBEDTLS_SSL_SESSION_TICKETS */ - -#if defined(MBEDTLS_ECDH_C) || defined(MBEDTLS_ECDSA_C) || \ - defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED) - case MBEDTLS_TLS_EXT_SUPPORTED_POINT_FORMATS: - MBEDTLS_SSL_DEBUG_MSG( 3, - ( "found supported_point_formats extension" ) ); - - if( ( ret = ssl_parse_supported_point_formats_ext( ssl, - ext + 4, ext_size ) ) != 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" ) ); - - if( ( ret = ssl_parse_ecjpake_kkpp( ssl, - ext + 4, ext_size ) ) != 0 ) - { - return( ret ); - } - - break; -#endif /* MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */ - -#if defined(MBEDTLS_SSL_ALPN) - case MBEDTLS_TLS_EXT_ALPN: - MBEDTLS_SSL_DEBUG_MSG( 3, ( "found alpn extension" ) ); - - if( ( ret = ssl_parse_alpn_ext( ssl, ext + 4, ext_size ) ) != 0 ) - return( ret ); - - break; -#endif /* MBEDTLS_SSL_ALPN */ - - default: - MBEDTLS_SSL_DEBUG_MSG( 3, - ( "unknown extension found: %d (ignoring)", ext_id ) ); - } - - ext_len -= 4 + ext_size; - ext += 4 + ext_size; - - if( ext_len > 0 && ext_len < 4 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server hello message" ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO ); - } - } - - /* - * 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" ) ); - 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_SERVER_HELLO ); - } - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse server hello" ) ); - - return( 0 ); -} - -#if defined(MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED) || \ - defined(MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED) -static int ssl_parse_server_dh_params( mbedtls_ssl_context *ssl, - unsigned char **p, - unsigned char *end ) -{ - int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE; - size_t dhm_actual_bitlen; - - /* - * 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_read_params( &ssl->handshake->dhm_ctx, - p, end ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 2, ( "mbedtls_dhm_read_params" ), ret ); - return( ret ); - } - - dhm_actual_bitlen = mbedtls_mpi_bitlen( &ssl->handshake->dhm_ctx.P ); - if( dhm_actual_bitlen < ssl->conf->dhm_min_bitlen ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "DHM prime too short: %u < %u", - (unsigned) dhm_actual_bitlen, - ssl->conf->dhm_min_bitlen ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE ); - } - - 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: 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_ECDHE_RSA_ENABLED) || \ - defined(MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED) || \ - defined(MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED) || \ - defined(MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED) || \ - defined(MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED) -static int ssl_check_server_ecdh_params( const mbedtls_ssl_context *ssl ) -{ - const mbedtls_ecp_curve_info *curve_info; - mbedtls_ecp_group_id grp_id; -#if defined(MBEDTLS_ECDH_LEGACY_CONTEXT) - grp_id = ssl->handshake->ecdh_ctx.grp.id; -#else - grp_id = ssl->handshake->ecdh_ctx.grp_id; -#endif - - curve_info = mbedtls_ecp_curve_info_from_grp_id( grp_id ); - if( curve_info == NULL ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); - return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); - } - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "ECDH curve: %s", curve_info->name ) ); - -#if defined(MBEDTLS_ECP_C) - if( mbedtls_ssl_check_curve( ssl, grp_id ) != 0 ) -#else - if( ssl->handshake->ecdh_ctx.grp.nbits < 163 || - ssl->handshake->ecdh_ctx.grp.nbits > 521 ) -#endif - return( -1 ); - - MBEDTLS_SSL_DEBUG_ECDH( 3, &ssl->handshake->ecdh_ctx, - MBEDTLS_DEBUG_ECDH_QP ); - - return( 0 ); -} -#endif /* MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED || - MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED || - MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED || - MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED || - MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED */ - -#if defined(MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED) || \ - defined(MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED) || \ - defined(MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED) -static int ssl_parse_server_ecdh_params( mbedtls_ssl_context *ssl, - unsigned char **p, - unsigned char *end ) -{ - int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE; - - /* - * Ephemeral ECDH parameters: - * - * struct { - * ECParameters curve_params; - * ECPoint public; - * } ServerECDHParams; - */ - if( ( ret = mbedtls_ecdh_read_params( &ssl->handshake->ecdh_ctx, - (const unsigned char **) p, end ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, ( "mbedtls_ecdh_read_params" ), ret ); -#if defined(MBEDTLS_SSL__ECP_RESTARTABLE) - if( ret == MBEDTLS_ERR_ECP_IN_PROGRESS ) - ret = MBEDTLS_ERR_SSL_CRYPTO_IN_PROGRESS; -#endif - return( ret ); - } - - if( ssl_check_server_ecdh_params( ssl ) != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, - ( "bad server key exchange message (ECDHE curve)" ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE ); - } - - return( ret ); -} -#endif /* MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED || - MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED || - MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED */ - -#if defined(MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED) -static int ssl_parse_server_psk_hint( mbedtls_ssl_context *ssl, - unsigned char **p, - unsigned char *end ) -{ - int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE; - size_t len; - ((void) ssl); - - /* - * PSK parameters: - * - * opaque psk_identity_hint<0..2^16-1>; - */ - if( end - (*p) < 2 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, - ( "bad server key exchange message (psk_identity_hint length)" ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE ); - } - len = (*p)[0] << 8 | (*p)[1]; - *p += 2; - - if( end - (*p) < (int) len ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, - ( "bad server key exchange message (psk_identity_hint length)" ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE ); - } - - /* - * Note: we currently ignore the PKS identity hint, as we only allow one - * PSK to be provisionned on the client. This could be changed later if - * someone needs that feature. - */ - *p += len; - ret = 0; - - return( ret ); -} -#endif /* MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED */ - -#if defined(MBEDTLS_KEY_EXCHANGE_RSA_ENABLED) || \ - defined(MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED) -/* - * Generate a pre-master secret and encrypt it with the server's RSA key - */ -static int ssl_write_encrypted_pms( mbedtls_ssl_context *ssl, - size_t offset, size_t *olen, - size_t pms_offset ) -{ - int ret; - size_t len_bytes = ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 ? 0 : 2; - unsigned char *p = ssl->handshake->premaster + pms_offset; - - if( offset + len_bytes > MBEDTLS_SSL_OUT_CONTENT_LEN ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small for encrypted pms" ) ); - return( MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL ); - } - - /* - * Generate (part of) the pre-master as - * struct { - * ProtocolVersion client_version; - * opaque random[46]; - * } PreMasterSecret; - */ - mbedtls_ssl_write_version( ssl->conf->max_major_ver, - ssl->conf->max_minor_ver, - ssl->conf->transport, p ); - - if( ( ret = ssl->conf->f_rng( ssl->conf->p_rng, p + 2, 46 ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "f_rng", ret ); - return( ret ); - } - - ssl->handshake->pmslen = 48; - - if( ssl->session_negotiate->peer_cert == NULL ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "certificate required" ) ); - return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE ); - } - - /* - * Now write it out, encrypted - */ - if( ! mbedtls_pk_can_do( &ssl->session_negotiate->peer_cert->pk, - MBEDTLS_PK_RSA ) ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "certificate key type mismatch" ) ); - return( MBEDTLS_ERR_SSL_PK_TYPE_MISMATCH ); - } - - if( ( ret = mbedtls_pk_encrypt( &ssl->session_negotiate->peer_cert->pk, - p, ssl->handshake->pmslen, - ssl->out_msg + offset + len_bytes, olen, - MBEDTLS_SSL_OUT_CONTENT_LEN - offset - len_bytes, - ssl->conf->f_rng, ssl->conf->p_rng ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_rsa_pkcs1_encrypt", ret ); - return( ret ); - } - -#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) || \ - defined(MBEDTLS_SSL_PROTO_TLS1_2) - if( len_bytes == 2 ) - { - ssl->out_msg[offset+0] = (unsigned char)( *olen >> 8 ); - ssl->out_msg[offset+1] = (unsigned char)( *olen ); - *olen += 2; - } -#endif - - return( 0 ); -} -#endif /* MBEDTLS_KEY_EXCHANGE_RSA_ENABLED || - MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED */ - -#if defined(MBEDTLS_SSL_PROTO_TLS1_2) -#if defined(MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED) || \ - defined(MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED) || \ - defined(MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED) -static int ssl_parse_signature_algorithm( mbedtls_ssl_context *ssl, - unsigned char **p, - unsigned char *end, - mbedtls_md_type_t *md_alg, - mbedtls_pk_type_t *pk_alg ) -{ - ((void) ssl); - *md_alg = MBEDTLS_MD_NONE; - *pk_alg = MBEDTLS_PK_NONE; - - /* Only in TLS 1.2 */ - if( ssl->minor_ver != MBEDTLS_SSL_MINOR_VERSION_3 ) - { - return( 0 ); - } - - if( (*p) + 2 > end ) - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE ); - - /* - * Get hash algorithm - */ - if( ( *md_alg = mbedtls_ssl_md_alg_from_hash( (*p)[0] ) ) - == MBEDTLS_MD_NONE ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, - ( "Server used unsupported HashAlgorithm %d", *(p)[0] ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE ); - } - - /* - * Get signature algorithm - */ - if( ( *pk_alg = mbedtls_ssl_pk_alg_from_sig( (*p)[1] ) ) - == MBEDTLS_PK_NONE ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, - ( "server used unsupported SignatureAlgorithm %d", (*p)[1] ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE ); - } - - /* - * Check if the hash is acceptable - */ - if( mbedtls_ssl_check_sig_hash( ssl, *md_alg ) != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, - ( "server used HashAlgorithm %d that was not offered", *(p)[0] ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE ); - } - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "Server used SignatureAlgorithm %d", - (*p)[1] ) ); - MBEDTLS_SSL_DEBUG_MSG( 2, ( "Server used HashAlgorithm %d", - (*p)[0] ) ); - *p += 2; - - return( 0 ); -} -#endif /* MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED || - MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED || - MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED */ -#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ - -#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; - const mbedtls_ecp_keypair *peer_key; - - if( ssl->session_negotiate->peer_cert == NULL ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "certificate required" ) ); - return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE ); - } - - if( ! mbedtls_pk_can_do( &ssl->session_negotiate->peer_cert->pk, - MBEDTLS_PK_ECKEY ) ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "server key not ECDH capable" ) ); - return( MBEDTLS_ERR_SSL_PK_TYPE_MISMATCH ); - } - - peer_key = mbedtls_pk_ec( ssl->session_negotiate->peer_cert->pk ); - - if( ( ret = mbedtls_ecdh_get_params( &ssl->handshake->ecdh_ctx, peer_key, - MBEDTLS_ECDH_THEIRS ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, ( "mbedtls_ecdh_get_params" ), ret ); - return( ret ); - } - - if( ssl_check_server_ecdh_params( ssl ) != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server certificate (ECDH curve)" ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE ); - } - - return( ret ); -} -#endif /* MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED) || - MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED */ - -static int ssl_parse_server_key_exchange( mbedtls_ssl_context *ssl ) -{ - int ret; - const mbedtls_ssl_ciphersuite_t *ciphersuite_info = - ssl->transform_negotiate->ciphersuite_info; - unsigned char *p = NULL, *end = NULL; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse server key exchange" ) ); - -#if defined(MBEDTLS_KEY_EXCHANGE_RSA_ENABLED) - if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip parse server key exchange" ) ); - ssl->state++; - return( 0 ); - } - ((void) p); - ((void) end); -#endif - -#if defined(MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED) || \ - defined(MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED) - if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDH_RSA || - ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA ) - { - if( ( ret = ssl_get_ecdh_params_from_cert( ssl ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "ssl_get_ecdh_params_from_cert", ret ); - mbedtls_ssl_send_alert_message( - ssl, - MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE ); - return( ret ); - } - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip parse server key exchange" ) ); - ssl->state++; - return( 0 ); - } - ((void) p); - ((void) end); -#endif /* MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED || - MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED */ - -#if defined(MBEDTLS_SSL__ECP_RESTARTABLE) - if( ssl->handshake->ecrs_enabled && - ssl->handshake->ecrs_state == ssl_ecrs_ske_start_processing ) - { - goto start_processing; - } -#endif - - if( ( ret = mbedtls_ssl_read_record( ssl, 1 ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_read_record", ret ); - return( ret ); - } - - if( ssl->in_msgtype != MBEDTLS_SSL_MSG_HANDSHAKE ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server key exchange message" ) ); - mbedtls_ssl_send_alert_message( - ssl, - MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_UNEXPECTED_MESSAGE ); - return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE ); - } - - /* - * ServerKeyExchange may be skipped with PSK and RSA-PSK when the server - * doesn't use a psk_identity_hint - */ - if( ssl->in_msg[0] != MBEDTLS_SSL_HS_SERVER_KEY_EXCHANGE ) - { - if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_PSK || - ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA_PSK ) - { - /* Current message is probably either - * CertificateRequest or ServerHelloDone */ - ssl->keep_current_message = 1; - goto exit; - } - - MBEDTLS_SSL_DEBUG_MSG( 1, - ( "server key exchange message must not be skipped" ) ); - mbedtls_ssl_send_alert_message( - ssl, - MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_UNEXPECTED_MESSAGE ); - - return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE ); - } - -#if defined(MBEDTLS_SSL__ECP_RESTARTABLE) - if( ssl->handshake->ecrs_enabled ) - ssl->handshake->ecrs_state = ssl_ecrs_ske_start_processing; - -start_processing: -#endif - p = ssl->in_msg + mbedtls_ssl_hs_hdr_len( ssl ); - end = ssl->in_msg + ssl->in_hslen; - MBEDTLS_SSL_DEBUG_BUF( 3, "server key exchange", p, end - p ); - -#if defined(MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED) - if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_PSK || - ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA_PSK || - ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_PSK || - ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_PSK ) - { - if( ssl_parse_server_psk_hint( ssl, &p, end ) != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server key exchange message" ) ); - mbedtls_ssl_send_alert_message( - ssl, - MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE ); - } - } /* FALLTROUGH */ -#endif /* MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED */ - -#if defined(MBEDTLS_KEY_EXCHANGE_PSK_ENABLED) || \ - defined(MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED) - if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_PSK || - ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA_PSK ) - ; /* nothing more to do */ - else -#endif /* MBEDTLS_KEY_EXCHANGE_PSK_ENABLED || - MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED */ -#if defined(MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED) || \ - defined(MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED) - if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_RSA || - ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_PSK ) - { - if( ssl_parse_server_dh_params( ssl, &p, end ) != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server key exchange message" ) ); - mbedtls_ssl_send_alert_message( - ssl, - MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE ); - } - } - else -#endif /* MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED || - MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED */ -#if defined(MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED) || \ - defined(MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED) || \ - defined(MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED) - if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_RSA || - ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_PSK || - ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA ) - { - if( ssl_parse_server_ecdh_params( ssl, &p, end ) != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server key exchange message" ) ); - mbedtls_ssl_send_alert_message( - ssl, - MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE ); - } - } - else -#endif /* MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED || - MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED || - MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_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 ); - mbedtls_ssl_send_alert_message( - ssl, - MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE ); - } - } - else -#endif /* MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */ - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); - return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); - } - -#if defined(MBEDTLS_KEY_EXCHANGE__WITH_SERVER_SIGNATURE__ENABLED) - if( mbedtls_ssl_ciphersuite_uses_server_signature( ciphersuite_info ) ) - { - size_t sig_len, hashlen; - unsigned char hash[64]; - mbedtls_md_type_t md_alg = MBEDTLS_MD_NONE; - mbedtls_pk_type_t pk_alg = MBEDTLS_PK_NONE; - unsigned char *params = ssl->in_msg + mbedtls_ssl_hs_hdr_len( ssl ); - size_t params_len = p - params; - void *rs_ctx = NULL; - - /* - * Handle the digitally-signed structure - */ -#if defined(MBEDTLS_SSL_PROTO_TLS1_2) - if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 ) - { - if( ssl_parse_signature_algorithm( ssl, &p, end, - &md_alg, &pk_alg ) != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, - ( "bad server key exchange message" ) ); - mbedtls_ssl_send_alert_message( - ssl, - MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE ); - } - - if( pk_alg != - mbedtls_ssl_get_ciphersuite_sig_pk_alg( ciphersuite_info ) ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, - ( "bad server key exchange message" ) ); - mbedtls_ssl_send_alert_message( - ssl, - MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE ); - } - } - 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( ssl->minor_ver < MBEDTLS_SSL_MINOR_VERSION_3 ) - { - pk_alg = mbedtls_ssl_get_ciphersuite_sig_pk_alg( ciphersuite_info ); - - /* Default hash for ECDSA is SHA-1 */ - if( pk_alg == MBEDTLS_PK_ECDSA && md_alg == MBEDTLS_MD_NONE ) - md_alg = MBEDTLS_MD_SHA1; - } - else -#endif - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); - return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); - } - - /* - * Read signature - */ - - if( p > end - 2 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server key exchange message" ) ); - mbedtls_ssl_send_alert_message( - ssl, - MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE ); - } - sig_len = ( p[0] << 8 ) | p[1]; - p += 2; - - if( p != end - sig_len ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server key exchange message" ) ); - mbedtls_ssl_send_alert_message( - ssl, - MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE ); - } - - MBEDTLS_SSL_DEBUG_BUF( 3, "signature", p, sig_len ); - - /* - * Compute the hash that has been 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, params, - params_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, - params, params_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 ); - - if( ssl->session_negotiate->peer_cert == NULL ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "certificate required" ) ); - mbedtls_ssl_send_alert_message( - ssl, - MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE ); - return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE ); - } - - /* - * Verify signature - */ - if( ! mbedtls_pk_can_do( &ssl->session_negotiate->peer_cert->pk, - pk_alg ) ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server key exchange message" ) ); - mbedtls_ssl_send_alert_message( - ssl, - MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE ); - return( MBEDTLS_ERR_SSL_PK_TYPE_MISMATCH ); - } - -#if defined(MBEDTLS_SSL__ECP_RESTARTABLE) - if( ssl->handshake->ecrs_enabled ) - rs_ctx = &ssl->handshake->ecrs_ctx.pk; -#endif - - if( ( ret = mbedtls_pk_verify_restartable( - &ssl->session_negotiate->peer_cert->pk, - md_alg, hash, hashlen, p, sig_len, rs_ctx ) ) != 0 ) - { -#if defined(MBEDTLS_SSL__ECP_RESTARTABLE) - if( ret != MBEDTLS_ERR_ECP_IN_PROGRESS ) -#endif - mbedtls_ssl_send_alert_message( - ssl, - MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_DECRYPT_ERROR ); - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_pk_verify", ret ); -#if defined(MBEDTLS_SSL__ECP_RESTARTABLE) - if( ret == MBEDTLS_ERR_ECP_IN_PROGRESS ) - ret = MBEDTLS_ERR_SSL_CRYPTO_IN_PROGRESS; -#endif - return( ret ); - } - } -#endif /* MBEDTLS_KEY_EXCHANGE__WITH_SERVER_SIGNATURE__ENABLED */ - -exit: - ssl->state++; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse server key exchange" ) ); - - return( 0 ); -} - -#if ! defined(MBEDTLS_KEY_EXCHANGE__CERT_REQ_ALLOWED__ENABLED) -static int ssl_parse_certificate_request( mbedtls_ssl_context *ssl ) -{ - const mbedtls_ssl_ciphersuite_t *ciphersuite_info = - ssl->transform_negotiate->ciphersuite_info; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse certificate request" ) ); - - if( ! mbedtls_ssl_ciphersuite_cert_req_allowed( ciphersuite_info ) ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip parse 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_parse_certificate_request( mbedtls_ssl_context *ssl ) -{ - int ret; - unsigned char *buf; - size_t n = 0; - size_t cert_type_len = 0, dn_len = 0; - const mbedtls_ssl_ciphersuite_t *ciphersuite_info = - ssl->transform_negotiate->ciphersuite_info; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse certificate request" ) ); - - if( ! mbedtls_ssl_ciphersuite_cert_req_allowed( ciphersuite_info ) ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip parse certificate request" ) ); - ssl->state++; - return( 0 ); - } - - if( ( ret = mbedtls_ssl_read_record( ssl, 1 ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_read_record", ret ); - return( ret ); - } - - if( ssl->in_msgtype != MBEDTLS_SSL_MSG_HANDSHAKE ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate request message" ) ); - mbedtls_ssl_send_alert_message( - ssl, - MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_UNEXPECTED_MESSAGE ); - return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE ); - } - - ssl->state++; - ssl->client_auth = ( ssl->in_msg[0] == MBEDTLS_SSL_HS_CERTIFICATE_REQUEST ); - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "got %s certificate request", - ssl->client_auth ? "a" : "no" ) ); - - if( ssl->client_auth == 0 ) - { - /* Current message is probably the ServerHelloDone */ - ssl->keep_current_message = 1; - goto exit; - } - - /* - * struct { - * ClientCertificateType certificate_types<1..2^8-1>; - * SignatureAndHashAlgorithm - * supported_signature_algorithms<2^16-1>; -- TLS 1.2 only - * DistinguishedName certificate_authorities<0..2^16-1>; - * } CertificateRequest; - * - * Since we only support a single certificate on clients, let's just - * ignore all the information that's supposed to help us pick a - * certificate. - * - * We could check that our certificate matches the request, and bail out - * if it doesn't, but it's simpler to just send the certificate anyway, - * and give the server the opportunity to decide if it should terminate - * the connection when it doesn't like our certificate. - * - * Same goes for the hash in TLS 1.2's signature_algorithms: at this - * point we only have one hash available (see comments in - * write_certificate_verify), so let's just use what we have. - * - * However, we still minimally parse the message to check it is at least - * superficially sane. - */ - buf = ssl->in_msg; - - /* certificate_types */ - if( ssl->in_hslen <= mbedtls_ssl_hs_hdr_len( ssl ) ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate request message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); - return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE_REQUEST ); - } - cert_type_len = buf[mbedtls_ssl_hs_hdr_len( ssl )]; - n = cert_type_len; - - /* - * In the subsequent code there are two paths that read from buf: - * * the length of the signature algorithms field (if minor version of - * SSL is 3), - * * distinguished name length otherwise. - * Both reach at most the index: - * ...hdr_len + 2 + n, - * therefore the buffer length at this point must be greater than that - * regardless of the actual code path. - */ - if( ssl->in_hslen <= mbedtls_ssl_hs_hdr_len( ssl ) + 2 + n ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate request message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); - return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE_REQUEST ); - } - - /* supported_signature_algorithms */ -#if defined(MBEDTLS_SSL_PROTO_TLS1_2) - if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 ) - { - size_t sig_alg_len = - ( ( buf[mbedtls_ssl_hs_hdr_len( ssl ) + 1 + n] << 8 ) - | ( buf[mbedtls_ssl_hs_hdr_len( ssl ) + 2 + n] ) ); -#if defined(MBEDTLS_DEBUG_C) - unsigned char* sig_alg; - size_t i; -#endif - - /* - * The furthest access in buf is in the loop few lines below: - * sig_alg[i + 1], - * where: - * sig_alg = buf + ...hdr_len + 3 + n, - * max(i) = sig_alg_len - 1. - * Therefore the furthest access is: - * buf[...hdr_len + 3 + n + sig_alg_len - 1 + 1], - * which reduces to: - * buf[...hdr_len + 3 + n + sig_alg_len], - * which is one less than we need the buf to be. - */ - if( ssl->in_hslen <= mbedtls_ssl_hs_hdr_len( ssl ) - + 3 + n + sig_alg_len ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate request message" ) ); - mbedtls_ssl_send_alert_message( - ssl, - MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); - return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE_REQUEST ); - } - -#if defined(MBEDTLS_DEBUG_C) - sig_alg = buf + mbedtls_ssl_hs_hdr_len( ssl ) + 3 + n; - for( i = 0; i < sig_alg_len; i += 2 ) - { - MBEDTLS_SSL_DEBUG_MSG( 3, - ( "Supported Signature Algorithm found: %d,%d", - sig_alg[i], sig_alg[i + 1] ) ); - } -#endif - - n += 2 + sig_alg_len; - } -#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ - - /* certificate_authorities */ - dn_len = ( ( buf[mbedtls_ssl_hs_hdr_len( ssl ) + 1 + n] << 8 ) - | ( buf[mbedtls_ssl_hs_hdr_len( ssl ) + 2 + n] ) ); - - n += dn_len; - if( ssl->in_hslen != mbedtls_ssl_hs_hdr_len( ssl ) + 3 + n ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate request message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); - return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE_REQUEST ); - } - -exit: - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse certificate request" ) ); - - return( 0 ); -} -#endif /* MBEDTLS_KEY_EXCHANGE__CERT_REQ_ALLOWED__ENABLED */ - -static int ssl_parse_server_hello_done( mbedtls_ssl_context *ssl ) -{ - int ret; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse server hello done" ) ); - - if( ( ret = mbedtls_ssl_read_record( ssl, 1 ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_read_record", ret ); - return( ret ); - } - - if( ssl->in_msgtype != MBEDTLS_SSL_MSG_HANDSHAKE ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server hello done message" ) ); - return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE ); - } - - if( ssl->in_hslen != mbedtls_ssl_hs_hdr_len( ssl ) || - ssl->in_msg[0] != MBEDTLS_SSL_HS_SERVER_HELLO_DONE ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server hello done message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO_DONE ); - } - - ssl->state++; - -#if defined(MBEDTLS_SSL_PROTO_DTLS) - if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) - mbedtls_ssl_recv_flight_completed( ssl ); -#endif - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse server hello done" ) ); - - return( 0 ); -} - -static int ssl_write_client_key_exchange( mbedtls_ssl_context *ssl ) -{ - int ret; - size_t i, n; - const mbedtls_ssl_ciphersuite_t *ciphersuite_info = - ssl->transform_negotiate->ciphersuite_info; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write client key exchange" ) ); - -#if defined(MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED) - if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_RSA ) - { - /* - * DHM key exchange -- send G^X mod P - */ - n = ssl->handshake->dhm_ctx.len; - - ssl->out_msg[4] = (unsigned char)( n >> 8 ); - ssl->out_msg[5] = (unsigned char)( n ); - i = 6; - - ret = mbedtls_dhm_make_public( &ssl->handshake->dhm_ctx, - (int) mbedtls_mpi_size( &ssl->handshake->dhm_ctx.P ), - &ssl->out_msg[i], n, - ssl->conf->f_rng, ssl->conf->p_rng ); - if( ret != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_dhm_make_public", ret ); - return( ret ); - } - - MBEDTLS_SSL_DEBUG_MPI( 3, "DHM: X ", &ssl->handshake->dhm_ctx.X ); - MBEDTLS_SSL_DEBUG_MPI( 3, "DHM: GX", &ssl->handshake->dhm_ctx.GX ); - - 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( ret ); - } - - 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 ) - { - /* - * ECDH key exchange -- send client public value - */ - i = 4; - -#if defined(MBEDTLS_SSL__ECP_RESTARTABLE) - if( ssl->handshake->ecrs_enabled ) - { - if( ssl->handshake->ecrs_state == ssl_ecrs_cke_ecdh_calc_secret ) - goto ecdh_calc_secret; - - mbedtls_ecdh_enable_restart( &ssl->handshake->ecdh_ctx ); - } -#endif - - ret = mbedtls_ecdh_make_public( &ssl->handshake->ecdh_ctx, - &n, - &ssl->out_msg[i], 1000, - ssl->conf->f_rng, ssl->conf->p_rng ); - if( ret != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecdh_make_public", ret ); -#if defined(MBEDTLS_SSL__ECP_RESTARTABLE) - if( ret == MBEDTLS_ERR_ECP_IN_PROGRESS ) - ret = MBEDTLS_ERR_SSL_CRYPTO_IN_PROGRESS; -#endif - return( ret ); - } - - MBEDTLS_SSL_DEBUG_ECDH( 3, &ssl->handshake->ecdh_ctx, - MBEDTLS_DEBUG_ECDH_Q ); - -#if defined(MBEDTLS_SSL__ECP_RESTARTABLE) - if( ssl->handshake->ecrs_enabled ) - { - ssl->handshake->ecrs_n = n; - ssl->handshake->ecrs_state = ssl_ecrs_cke_ecdh_calc_secret; - } - -ecdh_calc_secret: - if( ssl->handshake->ecrs_enabled ) - n = ssl->handshake->ecrs_n; -#endif - 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 ); -#if defined(MBEDTLS_SSL__ECP_RESTARTABLE) - if( ret == MBEDTLS_ERR_ECP_IN_PROGRESS ) - ret = MBEDTLS_ERR_SSL_CRYPTO_IN_PROGRESS; -#endif - return( ret ); - } - - 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__SOME__PSK_ENABLED) - if( mbedtls_ssl_ciphersuite_uses_psk( ciphersuite_info ) ) - { - /* - * opaque psk_identity<0..2^16-1>; - */ - if( ssl->conf->psk == NULL || ssl->conf->psk_identity == NULL ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "got no private key for PSK" ) ); - return( MBEDTLS_ERR_SSL_PRIVATE_KEY_REQUIRED ); - } - - i = 4; - n = ssl->conf->psk_identity_len; - - if( i + 2 + n > MBEDTLS_SSL_OUT_CONTENT_LEN ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, - ( "psk identity too long or SSL buffer too short" ) ); - return( MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL ); - } - - ssl->out_msg[i++] = (unsigned char)( n >> 8 ); - ssl->out_msg[i++] = (unsigned char)( n ); - - memcpy( ssl->out_msg + i, - ssl->conf->psk_identity, - ssl->conf->psk_identity_len ); - i += ssl->conf->psk_identity_len; - -#if defined(MBEDTLS_KEY_EXCHANGE_PSK_ENABLED) - if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_PSK ) - { - n = 0; - } - else -#endif -#if defined(MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED) - if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA_PSK ) - { - if( ( ret = ssl_write_encrypted_pms( ssl, i, &n, 2 ) ) != 0 ) - return( ret ); - } - else -#endif -#if defined(MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED) - if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_PSK ) - { - /* - * ClientDiffieHellmanPublic public (DHM send G^X mod P) - */ - n = ssl->handshake->dhm_ctx.len; - - if( i + 2 + n > MBEDTLS_SSL_OUT_CONTENT_LEN ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, - ( "psk identity or DHM size too long or SSL buffer too short" ) ); - return( MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL ); - } - - ssl->out_msg[i++] = (unsigned char)( n >> 8 ); - ssl->out_msg[i++] = (unsigned char)( n ); - - ret = mbedtls_dhm_make_public( &ssl->handshake->dhm_ctx, - (int) mbedtls_mpi_size( &ssl->handshake->dhm_ctx.P ), - &ssl->out_msg[i], n, - ssl->conf->f_rng, ssl->conf->p_rng ); - if( ret != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_dhm_make_public", 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 ) - { - /* - * ClientECDiffieHellmanPublic public; - */ - ret = mbedtls_ecdh_make_public( &ssl->handshake->ecdh_ctx, &n, - &ssl->out_msg[i], MBEDTLS_SSL_OUT_CONTENT_LEN - i, - ssl->conf->f_rng, ssl->conf->p_rng ); - if( ret != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecdh_make_public", ret ); - return( ret ); - } - - MBEDTLS_SSL_DEBUG_ECDH( 3, &ssl->handshake->ecdh_ctx, - MBEDTLS_DEBUG_ECDH_Q ); - } - else -#endif /* MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED */ - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); - return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); - } - - 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__SOME__PSK_ENABLED */ -#if defined(MBEDTLS_KEY_EXCHANGE_RSA_ENABLED) - if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA ) - { - i = 4; - if( ( ret = ssl_write_encrypted_pms( ssl, i, &n, 0 ) ) != 0 ) - 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 ) - { - i = 4; - - ret = mbedtls_ecjpake_write_round_two( &ssl->handshake->ecjpake_ctx, - ssl->out_msg + i, MBEDTLS_SSL_OUT_CONTENT_LEN - i, &n, - ssl->conf->f_rng, ssl->conf->p_rng ); - if( ret != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecjpake_write_round_two", ret ); - return( ret ); - } - - 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_RSA_ENABLED */ - { - ((void) ciphersuite_info); - MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); - return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); - } - - ssl->out_msglen = i + n; - ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE; - ssl->out_msg[0] = MBEDTLS_SSL_HS_CLIENT_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 client key exchange" ) ); - - return( 0 ); -} - -#if !defined(MBEDTLS_KEY_EXCHANGE_RSA_ENABLED) && \ - !defined(MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED) && \ - !defined(MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED) && \ - !defined(MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED) && \ - !defined(MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED)&& \ - !defined(MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED) -static int ssl_write_certificate_verify( mbedtls_ssl_context *ssl ) -{ - const mbedtls_ssl_ciphersuite_t *ciphersuite_info = - ssl->transform_negotiate->ciphersuite_info; - int ret; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write certificate verify" ) ); - - if( ( ret = mbedtls_ssl_derive_keys( ssl ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_derive_keys", ret ); - return( ret ); - } - - if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_PSK || - ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA_PSK || - ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_PSK || - ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_PSK || - ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECJPAKE ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip write certificate verify" ) ); - ssl->state++; - return( 0 ); - } - - MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); - return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); -} -#else -static int ssl_write_certificate_verify( mbedtls_ssl_context *ssl ) -{ - int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE; - const mbedtls_ssl_ciphersuite_t *ciphersuite_info = - ssl->transform_negotiate->ciphersuite_info; - size_t n = 0, offset = 0; - unsigned char hash[48]; - unsigned char *hash_start = hash; - mbedtls_md_type_t md_alg = MBEDTLS_MD_NONE; - unsigned int hashlen; - void *rs_ctx = NULL; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write certificate verify" ) ); - -#if defined(MBEDTLS_SSL__ECP_RESTARTABLE) - if( ssl->handshake->ecrs_enabled && - ssl->handshake->ecrs_state == ssl_ecrs_crt_vrfy_sign ) - { - goto sign; - } -#endif - - if( ( ret = mbedtls_ssl_derive_keys( ssl ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_derive_keys", ret ); - return( ret ); - } - - if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_PSK || - ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA_PSK || - ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_PSK || - ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_PSK || - ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECJPAKE ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip write certificate verify" ) ); - ssl->state++; - return( 0 ); - } - - if( ssl->client_auth == 0 || mbedtls_ssl_own_cert( ssl ) == NULL ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip write certificate verify" ) ); - ssl->state++; - return( 0 ); - } - - if( mbedtls_ssl_own_key( ssl ) == NULL ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "got no private key for certificate" ) ); - return( MBEDTLS_ERR_SSL_PRIVATE_KEY_REQUIRED ); - } - - /* - * Make a signature of the handshake digests - */ -#if defined(MBEDTLS_SSL__ECP_RESTARTABLE) - if( ssl->handshake->ecrs_enabled ) - ssl->handshake->ecrs_state = ssl_ecrs_crt_vrfy_sign; - -sign: -#endif - - ssl->handshake->calc_verify( ssl, hash ); - -#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 ) - { - /* - * digitally-signed struct { - * opaque md5_hash[16]; - * opaque sha_hash[20]; - * }; - * - * md5_hash - * MD5(handshake_messages); - * - * sha_hash - * SHA(handshake_messages); - */ - hashlen = 36; - md_alg = MBEDTLS_MD_NONE; - - /* - * For ECDSA, default hash is SHA-1 only - */ - if( mbedtls_pk_can_do( mbedtls_ssl_own_key( ssl ), 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 ) - { - /* - * digitally-signed struct { - * opaque handshake_messages[handshake_messages_length]; - * }; - * - * Taking shortcut here. We assume that the server always allows the - * PRF Hash function and has sent it in the allowed signature - * algorithms list received in the Certificate Request message. - * - * Until we encounter a server that does not, we will take this - * shortcut. - * - * Reason: Otherwise we should have running hashes for SHA512 and - * SHA224 in order to satisfy 'weird' needs from the server - * side. - */ - if( ssl->transform_negotiate->ciphersuite_info->mac == - MBEDTLS_MD_SHA384 ) - { - md_alg = MBEDTLS_MD_SHA384; - ssl->out_msg[4] = MBEDTLS_SSL_HASH_SHA384; - } - else - { - md_alg = MBEDTLS_MD_SHA256; - ssl->out_msg[4] = MBEDTLS_SSL_HASH_SHA256; - } - ssl->out_msg[5] = mbedtls_ssl_sig_from_pk( mbedtls_ssl_own_key( ssl ) ); - - /* Info from md_alg will be used instead */ - hashlen = 0; - offset = 2; - } - else -#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); - return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); - } - -#if defined(MBEDTLS_SSL__ECP_RESTARTABLE) - if( ssl->handshake->ecrs_enabled ) - rs_ctx = &ssl->handshake->ecrs_ctx.pk; -#endif - - if( ( ret = mbedtls_pk_sign_restartable( mbedtls_ssl_own_key( ssl ), - md_alg, hash_start, hashlen, - ssl->out_msg + 6 + offset, &n, - ssl->conf->f_rng, ssl->conf->p_rng, rs_ctx ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_pk_sign", ret ); -#if defined(MBEDTLS_SSL__ECP_RESTARTABLE) - if( ret == MBEDTLS_ERR_ECP_IN_PROGRESS ) - ret = MBEDTLS_ERR_SSL_CRYPTO_IN_PROGRESS; -#endif - return( ret ); - } - - ssl->out_msg[4 + offset] = (unsigned char)( n >> 8 ); - ssl->out_msg[5 + offset] = (unsigned char)( n ); - - ssl->out_msglen = 6 + n + offset; - ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE; - ssl->out_msg[0] = MBEDTLS_SSL_HS_CERTIFICATE_VERIFY; - - 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 certificate verify" ) ); - - return( ret ); -} -#endif /* !MBEDTLS_KEY_EXCHANGE_RSA_ENABLED && - !MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED && - !MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED && - !MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED && - !MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED && - !MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED */ - -#if defined(MBEDTLS_SSL_SESSION_TICKETS) -static int ssl_parse_new_session_ticket( mbedtls_ssl_context *ssl ) -{ - int ret; - uint32_t lifetime; - size_t ticket_len; - unsigned char *ticket; - const unsigned char *msg; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse new session ticket" ) ); - - if( ( ret = mbedtls_ssl_read_record( ssl, 1 ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_read_record", ret ); - return( ret ); - } - - if( ssl->in_msgtype != MBEDTLS_SSL_MSG_HANDSHAKE ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad new session ticket message" ) ); - mbedtls_ssl_send_alert_message( - ssl, - MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_UNEXPECTED_MESSAGE ); - return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE ); - } - - /* - * struct { - * uint32 ticket_lifetime_hint; - * opaque ticket<0..2^16-1>; - * } NewSessionTicket; - * - * 0 . 3 ticket_lifetime_hint - * 4 . 5 ticket_len (n) - * 6 . 5+n ticket content - */ - if( ssl->in_msg[0] != MBEDTLS_SSL_HS_NEW_SESSION_TICKET || - ssl->in_hslen < 6 + mbedtls_ssl_hs_hdr_len( ssl ) ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad new session ticket message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); - return( MBEDTLS_ERR_SSL_BAD_HS_NEW_SESSION_TICKET ); - } - - msg = ssl->in_msg + mbedtls_ssl_hs_hdr_len( ssl ); - - lifetime = ( ((uint32_t) msg[0]) << 24 ) | ( msg[1] << 16 ) | - ( msg[2] << 8 ) | ( msg[3] ); - - ticket_len = ( msg[4] << 8 ) | ( msg[5] ); - - if( ticket_len + 6 + mbedtls_ssl_hs_hdr_len( ssl ) != ssl->in_hslen ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad new session ticket message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); - return( MBEDTLS_ERR_SSL_BAD_HS_NEW_SESSION_TICKET ); - } - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "ticket length: %d", ticket_len ) ); - - /* We're not waiting for a NewSessionTicket message any more */ - ssl->handshake->new_session_ticket = 0; - ssl->state = MBEDTLS_SSL_SERVER_CHANGE_CIPHER_SPEC; - - /* - * Zero-length ticket means the server changed his mind and doesn't want - * to send a ticket after all, so just forget it - */ - if( ticket_len == 0 ) - return( 0 ); - - mbedtls_platform_zeroize( ssl->session_negotiate->ticket, - ssl->session_negotiate->ticket_len ); - mbedtls_free( ssl->session_negotiate->ticket ); - ssl->session_negotiate->ticket = NULL; - ssl->session_negotiate->ticket_len = 0; - - if( ( ticket = mbedtls_calloc( 1, ticket_len ) ) == NULL ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "ticket alloc failed" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_INTERNAL_ERROR ); - return( MBEDTLS_ERR_SSL_ALLOC_FAILED ); - } - - memcpy( ticket, msg + 6, ticket_len ); - - ssl->session_negotiate->ticket = ticket; - ssl->session_negotiate->ticket_len = ticket_len; - ssl->session_negotiate->ticket_lifetime = lifetime; - - /* - * RFC 5077 section 3.4: - * "If the client receives a session ticket from the server, then it - * discards any Session ID that was sent in the ServerHello." - */ - MBEDTLS_SSL_DEBUG_MSG( 3, ( "ticket in use, discarding session id" ) ); - ssl->session_negotiate->id_len = 0; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse new session ticket" ) ); - - return( 0 ); -} -#endif /* MBEDTLS_SSL_SESSION_TICKETS */ - -/* - * SSL handshake -- client side -- single step - */ -int mbedtls_ssl_handshake_client_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, ( "client 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 */ - - /* Change state now, so that it is right in mbedtls_ssl_read_record(), used - * by DTLS for dropping out-of-sequence ChangeCipherSpec records */ -#if defined(MBEDTLS_SSL_SESSION_TICKETS) - if( ssl->state == MBEDTLS_SSL_SERVER_CHANGE_CIPHER_SPEC && - ssl->handshake->new_session_ticket != 0 ) - { - ssl->state = MBEDTLS_SSL_SERVER_NEW_SESSION_TICKET; - } -#endif - - switch( ssl->state ) - { - case MBEDTLS_SSL_HELLO_REQUEST: - ssl->state = MBEDTLS_SSL_CLIENT_HELLO; - break; - - /* - * ==> ClientHello - */ - case MBEDTLS_SSL_CLIENT_HELLO: - ret = ssl_write_client_hello( ssl ); - break; - - /* - * <== ServerHello - * Certificate - * ( ServerKeyExchange ) - * ( CertificateRequest ) - * ServerHelloDone - */ - case MBEDTLS_SSL_SERVER_HELLO: - ret = ssl_parse_server_hello( ssl ); - break; - - case MBEDTLS_SSL_SERVER_CERTIFICATE: - ret = mbedtls_ssl_parse_certificate( ssl ); - break; - - case MBEDTLS_SSL_SERVER_KEY_EXCHANGE: - ret = ssl_parse_server_key_exchange( ssl ); - break; - - case MBEDTLS_SSL_CERTIFICATE_REQUEST: - ret = ssl_parse_certificate_request( ssl ); - break; - - case MBEDTLS_SSL_SERVER_HELLO_DONE: - ret = ssl_parse_server_hello_done( ssl ); - break; - - /* - * ==> ( Certificate/Alert ) - * ClientKeyExchange - * ( CertificateVerify ) - * ChangeCipherSpec - * Finished - */ - case MBEDTLS_SSL_CLIENT_CERTIFICATE: - ret = mbedtls_ssl_write_certificate( ssl ); - break; - - case MBEDTLS_SSL_CLIENT_KEY_EXCHANGE: - ret = ssl_write_client_key_exchange( ssl ); - break; - - case MBEDTLS_SSL_CERTIFICATE_VERIFY: - ret = ssl_write_certificate_verify( ssl ); - break; - - case MBEDTLS_SSL_CLIENT_CHANGE_CIPHER_SPEC: - ret = mbedtls_ssl_write_change_cipher_spec( ssl ); - break; - - case MBEDTLS_SSL_CLIENT_FINISHED: - ret = mbedtls_ssl_write_finished( ssl ); - break; - - /* - * <== ( NewSessionTicket ) - * ChangeCipherSpec - * Finished - */ -#if defined(MBEDTLS_SSL_SESSION_TICKETS) - case MBEDTLS_SSL_SERVER_NEW_SESSION_TICKET: - ret = ssl_parse_new_session_ticket( ssl ); - break; -#endif - - case MBEDTLS_SSL_SERVER_CHANGE_CIPHER_SPEC: - ret = mbedtls_ssl_parse_change_cipher_spec( ssl ); - break; - - case MBEDTLS_SSL_SERVER_FINISHED: - ret = mbedtls_ssl_parse_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_CLI_C */ |