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Diff: mbedtls/source/ssl_cli.c
- Revision:
- 20:9d2428bde914
- Parent:
- 19:6bc40ac8b054
- Child:
- 21:552b630becf2
--- a/mbedtls/source/ssl_cli.c Thu Nov 17 18:35:51 2016 +0000
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,3378 +0,0 @@
-/*
- * SSLv3/TLSv1 client-side functions
- *
- * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
- * SPDX-License-Identifier: Apache-2.0
- *
- * Licensed under the Apache License, Version 2.0 (the "License"); you may
- * not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
- * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- *
- * This file is part of mbed TLS (https://tls.mbed.org)
- */
-
-#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)
-/* Implementation that should never be optimized out by the compiler */
-static void mbedtls_zeroize( void *v, size_t n ) {
- volatile unsigned char *p = v; while( n-- ) *p++ = 0;
-}
-#endif
-
-#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
-static void ssl_write_hostname_ext( mbedtls_ssl_context *ssl,
- unsigned char *buf,
- size_t *olen )
-{
- unsigned char *p = buf;
- const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_MAX_CONTENT_LEN;
- size_t hostname_len;
-
- *olen = 0;
-
- if( ssl->hostname == NULL )
- return;
-
- MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, adding server name extension: %s",
- ssl->hostname ) );
-
- hostname_len = strlen( ssl->hostname );
-
- if( end < p || (size_t)( end - p ) < hostname_len + 9 )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small" ) );
- return;
- }
-
- /*
- * 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;
-}
-#endif /* MBEDTLS_SSL_SERVER_NAME_INDICATION */
-
-#if defined(MBEDTLS_SSL_RENEGOTIATION)
-static void ssl_write_renegotiation_ext( mbedtls_ssl_context *ssl,
- unsigned char *buf,
- size_t *olen )
-{
- unsigned char *p = buf;
- const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_MAX_CONTENT_LEN;
-
- *olen = 0;
-
- if( ssl->renego_status != MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS )
- return;
-
- MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, adding renegotiation extension" ) );
-
- if( end < p || (size_t)( end - p ) < 5 + ssl->verify_data_len )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small" ) );
- return;
- }
-
- /*
- * 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;
-}
-#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 void ssl_write_signature_algorithms_ext( mbedtls_ssl_context *ssl,
- unsigned char *buf,
- size_t *olen )
-{
- unsigned char *p = buf;
- const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_MAX_CONTENT_LEN;
- 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;
-
- MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, adding signature_algorithms extension" ) );
-
- 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( end < p || (size_t)( end - p ) < sig_alg_len + 6 )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small" ) );
- return;
- }
-
- /*
- * 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;
-}
-#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 void ssl_write_supported_elliptic_curves_ext( mbedtls_ssl_context *ssl,
- unsigned char *buf,
- size_t *olen )
-{
- unsigned char *p = buf;
- const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_MAX_CONTENT_LEN;
- unsigned char *elliptic_curve_list = p + 6;
- size_t elliptic_curve_len = 0;
- const mbedtls_ecp_curve_info *info;
-#if defined(MBEDTLS_ECP_C)
- const mbedtls_ecp_group_id *grp_id;
-#else
- ((void) ssl);
-#endif
-
- *olen = 0;
-
- MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, adding supported_elliptic_curves extension" ) );
-
-#if defined(MBEDTLS_ECP_C)
- 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 );
-#else
- for( info = mbedtls_ecp_curve_list(); info->grp_id != MBEDTLS_ECP_DP_NONE; info++ )
- {
-#endif
- if( info == NULL )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "invalid curve in ssl configuration" ) );
- return;
- }
-
- elliptic_curve_len += 2;
- }
-
- if( end < p || (size_t)( end - p ) < 6 + elliptic_curve_len )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small" ) );
- return;
- }
-
- elliptic_curve_len = 0;
-
-#if defined(MBEDTLS_ECP_C)
- 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 );
-#else
- for( info = mbedtls_ecp_curve_list(); info->grp_id != MBEDTLS_ECP_DP_NONE; info++ )
- {
-#endif
- elliptic_curve_list[elliptic_curve_len++] = info->tls_id >> 8;
- elliptic_curve_list[elliptic_curve_len++] = info->tls_id & 0xFF;
- }
-
- if( elliptic_curve_len == 0 )
- return;
-
- *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;
-}
-
-static void ssl_write_supported_point_formats_ext( mbedtls_ssl_context *ssl,
- unsigned char *buf,
- size_t *olen )
-{
- unsigned char *p = buf;
- const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_MAX_CONTENT_LEN;
-
- *olen = 0;
-
- MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, adding supported_point_formats extension" ) );
-
- if( end < p || (size_t)( end - p ) < 6 )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small" ) );
- return;
- }
-
- *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SUPPORTED_POINT_FORMATS >> 8 ) & 0xFF );
- *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SUPPORTED_POINT_FORMATS ) & 0xFF );
-
- *p++ = 0x00;
- *p++ = 2;
-
- *p++ = 1;
- *p++ = MBEDTLS_ECP_PF_UNCOMPRESSED;
-
- *olen = 6;
-}
-#endif /* MBEDTLS_ECDH_C || MBEDTLS_ECDSA_C ||
- MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */
-
-#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
-static void ssl_write_ecjpake_kkpp_ext( mbedtls_ssl_context *ssl,
- unsigned char *buf,
- size_t *olen )
-{
- int ret;
- unsigned char *p = buf;
- const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_MAX_CONTENT_LEN;
- 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;
-
- MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, adding ecjpake_kkpp extension" ) );
-
- if( end - p < 4 )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small" ) );
- return;
- }
-
- *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_ECJPAKE_KKPP >> 8 ) & 0xFF );
- *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_ECJPAKE_KKPP ) & 0xFF );
-
- /*
- * 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;
- }
-
- ssl->handshake->ecjpake_cache = mbedtls_calloc( 1, kkpp_len );
- if( ssl->handshake->ecjpake_cache == NULL )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "allocation failed" ) );
- return;
- }
-
- 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;
-
- if( (size_t)( end - p - 2 ) < kkpp_len )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small" ) );
- return;
- }
-
- 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;
-}
-#endif /* MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */
-
-#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
-static void ssl_write_max_fragment_length_ext( mbedtls_ssl_context *ssl,
- unsigned char *buf,
- size_t *olen )
-{
- unsigned char *p = buf;
- const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_MAX_CONTENT_LEN;
-
- *olen = 0;
-
- if( ssl->conf->mfl_code == MBEDTLS_SSL_MAX_FRAG_LEN_NONE ) {
- return;
- }
-
- MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, adding max_fragment_length extension" ) );
-
- if( end < p || (size_t)( end - p ) < 5 )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small" ) );
- return;
- }
-
- *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;
-}
-#endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */
-
-#if defined(MBEDTLS_SSL_TRUNCATED_HMAC)
-static void ssl_write_truncated_hmac_ext( mbedtls_ssl_context *ssl,
- unsigned char *buf, size_t *olen )
-{
- unsigned char *p = buf;
- const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_MAX_CONTENT_LEN;
-
- *olen = 0;
-
- if( ssl->conf->trunc_hmac == MBEDTLS_SSL_TRUNC_HMAC_DISABLED )
- {
- return;
- }
-
- MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, adding truncated_hmac extension" ) );
-
- if( end < p || (size_t)( end - p ) < 4 )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small" ) );
- return;
- }
-
- *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_TRUNCATED_HMAC >> 8 ) & 0xFF );
- *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_TRUNCATED_HMAC ) & 0xFF );
-
- *p++ = 0x00;
- *p++ = 0x00;
-
- *olen = 4;
-}
-#endif /* MBEDTLS_SSL_TRUNCATED_HMAC */
-
-#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
-static void ssl_write_encrypt_then_mac_ext( mbedtls_ssl_context *ssl,
- unsigned char *buf, size_t *olen )
-{
- unsigned char *p = buf;
- const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_MAX_CONTENT_LEN;
-
- *olen = 0;
-
- if( ssl->conf->encrypt_then_mac == MBEDTLS_SSL_ETM_DISABLED ||
- ssl->conf->max_minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 )
- {
- return;
- }
-
- MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, adding encrypt_then_mac "
- "extension" ) );
-
- if( end < p || (size_t)( end - p ) < 4 )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small" ) );
- return;
- }
-
- *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_ENCRYPT_THEN_MAC >> 8 ) & 0xFF );
- *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_ENCRYPT_THEN_MAC ) & 0xFF );
-
- *p++ = 0x00;
- *p++ = 0x00;
-
- *olen = 4;
-}
-#endif /* MBEDTLS_SSL_ENCRYPT_THEN_MAC */
-
-#if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET)
-static void ssl_write_extended_ms_ext( mbedtls_ssl_context *ssl,
- unsigned char *buf, size_t *olen )
-{
- unsigned char *p = buf;
- const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_MAX_CONTENT_LEN;
-
- *olen = 0;
-
- if( ssl->conf->extended_ms == MBEDTLS_SSL_EXTENDED_MS_DISABLED ||
- ssl->conf->max_minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 )
- {
- return;
- }
-
- MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, adding extended_master_secret "
- "extension" ) );
-
- if( end < p || (size_t)( end - p ) < 4 )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small" ) );
- return;
- }
-
- *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_EXTENDED_MASTER_SECRET >> 8 ) & 0xFF );
- *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_EXTENDED_MASTER_SECRET ) & 0xFF );
-
- *p++ = 0x00;
- *p++ = 0x00;
-
- *olen = 4;
-}
-#endif /* MBEDTLS_SSL_EXTENDED_MASTER_SECRET */
-
-#if defined(MBEDTLS_SSL_SESSION_TICKETS)
-static void ssl_write_session_ticket_ext( mbedtls_ssl_context *ssl,
- unsigned char *buf, size_t *olen )
-{
- unsigned char *p = buf;
- const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_MAX_CONTENT_LEN;
- size_t tlen = ssl->session_negotiate->ticket_len;
-
- *olen = 0;
-
- if( ssl->conf->session_tickets == MBEDTLS_SSL_SESSION_TICKETS_DISABLED )
- {
- return;
- }
-
- MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, adding session ticket extension" ) );
-
- if( end < p || (size_t)( end - p ) < 4 + tlen )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small" ) );
- return;
- }
-
- *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;
- }
-
- MBEDTLS_SSL_DEBUG_MSG( 3, ( "sending session ticket of length %d", tlen ) );
-
- memcpy( p, ssl->session_negotiate->ticket, tlen );
-
- *olen += tlen;
-}
-#endif /* MBEDTLS_SSL_SESSION_TICKETS */
-
-#if defined(MBEDTLS_SSL_ALPN)
-static void ssl_write_alpn_ext( mbedtls_ssl_context *ssl,
- unsigned char *buf, size_t *olen )
-{
- unsigned char *p = buf;
- const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_MAX_CONTENT_LEN;
- size_t alpnlen = 0;
- const char **cur;
-
- *olen = 0;
-
- if( ssl->conf->alpn_list == NULL )
- {
- return;
- }
-
- MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, adding alpn extension" ) );
-
- for( cur = ssl->conf->alpn_list; *cur != NULL; cur++ )
- alpnlen += (unsigned char)( strlen( *cur ) & 0xFF ) + 1;
-
- if( end < p || (size_t)( end - p ) < 6 + alpnlen )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small" ) );
- return;
- }
-
- *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++ )
- {
- *p = (unsigned char)( strlen( *cur ) & 0xFF );
- 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 );
-}
-#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 );
-}
-
-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;
- unsigned char offer_compress;
- const int *ciphersuites;
- const mbedtls_ssl_ciphersuite_t *ciphersuite_info;
-
- 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 );
- }
-
- /*
- * 0 . 0 handshake type
- * 1 . 3 handshake length
- * 4 . 5 highest version supported
- * 6 . 9 current UNIX time
- * 10 . 37 random bytes
- */
- buf = ssl->out_msg;
- 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 . .. DTSL 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 */
-
- *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 );
-
- /*
- * DTLS cookie
- */
-#if defined(MBEDTLS_SSL_PROTO_DTLS)
- if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
- {
- 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;
- 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;
- p += 2;
-
- for( i = 0; ciphersuites[i] != 0; i++ )
- {
- ciphersuite_info = mbedtls_ssl_ciphersuite_from_id( ciphersuites[i] );
-
- if( ciphersuite_info == NULL )
- continue;
-
- if( ciphersuite_info->min_minor_ver > ssl->conf->max_minor_ver ||
- ciphersuite_info->max_minor_ver < ssl->conf->min_minor_ver )
- continue;
-
-#if defined(MBEDTLS_SSL_PROTO_DTLS)
- if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
- ( ciphersuite_info->flags & MBEDTLS_CIPHERSUITE_NODTLS ) )
- continue;
-#endif
-
-#if defined(MBEDTLS_ARC4_C)
- if( ssl->conf->arc4_disabled == MBEDTLS_SSL_ARC4_DISABLED &&
- ciphersuite_info->cipher == MBEDTLS_CIPHER_ARC4_128 )
- continue;
-#endif
-
-#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
- if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECJPAKE &&
- mbedtls_ecjpake_check( &ssl->handshake->ecjpake_ctx ) != 0 )
- continue;
-#endif
-
- MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, add ciphersuite: %04x",
- ciphersuites[i] ) );
-
- n++;
- *p++ = (unsigned char)( ciphersuites[i] >> 8 );
- *p++ = (unsigned char)( ciphersuites[i] );
- }
-
- /*
- * Add TLS_EMPTY_RENEGOTIATION_INFO_SCSV
- */
-#if defined(MBEDTLS_SSL_RENEGOTIATION)
- if( ssl->renego_status == MBEDTLS_SSL_INITIAL_HANDSHAKE )
-#endif
- {
- *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" ) );
- *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 );
-
- MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, got %d ciphersuites", n ) );
-
-#if defined(MBEDTLS_ZLIB_SUPPORT)
- offer_compress = 1;
-#else
- offer_compress = 0;
-#endif
-
- /*
- * We don't support compression with DTLS right now: is 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 ) );
-
- *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 ) );
-
- *p++ = 1;
- *p++ = MBEDTLS_SSL_COMPRESS_NULL;
- }
-
- // First write extensions, then the total length
- //
-#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
- ssl_write_hostname_ext( ssl, p + 2 + ext_len, &olen );
- ext_len += olen;
-#endif
-
-#if defined(MBEDTLS_SSL_RENEGOTIATION)
- ssl_write_renegotiation_ext( ssl, p + 2 + ext_len, &olen );
- ext_len += olen;
-#endif
-
-#if defined(MBEDTLS_SSL_PROTO_TLS1_2) && \
- defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED)
- ssl_write_signature_algorithms_ext( ssl, p + 2 + ext_len, &olen );
- ext_len += olen;
-#endif
-
-#if defined(MBEDTLS_ECDH_C) || defined(MBEDTLS_ECDSA_C) || \
- defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
- ssl_write_supported_elliptic_curves_ext( ssl, p + 2 + ext_len, &olen );
- ext_len += olen;
-
- ssl_write_supported_point_formats_ext( ssl, p + 2 + ext_len, &olen );
- ext_len += olen;
-#endif
-
-#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
- ssl_write_ecjpake_kkpp_ext( ssl, p + 2 + ext_len, &olen );
- ext_len += olen;
-#endif
-
-#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
- ssl_write_max_fragment_length_ext( ssl, p + 2 + ext_len, &olen );
- ext_len += olen;
-#endif
-
-#if defined(MBEDTLS_SSL_TRUNCATED_HMAC)
- ssl_write_truncated_hmac_ext( ssl, p + 2 + ext_len, &olen );
- ext_len += olen;
-#endif
-
-#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
- ssl_write_encrypt_then_mac_ext( ssl, p + 2 + ext_len, &olen );
- ext_len += olen;
-#endif
-
-#if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET)
- ssl_write_extended_ms_ext( ssl, p + 2 + ext_len, &olen );
- ext_len += olen;
-#endif
-
-#if defined(MBEDTLS_SSL_ALPN)
- ssl_write_alpn_ext( ssl, p + 2 + ext_len, &olen );
- ext_len += olen;
-#endif
-
-#if defined(MBEDTLS_SSL_SESSION_TICKETS)
- ssl_write_session_ticket_ext( ssl, p + 2 + ext_len, &olen );
- ext_len += olen;
-#endif
-
- /* 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 )
- {
- *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_record( ssl ) ) != 0 )
- {
- MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_record", ret );
- return( ret );
- }
-
- 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 )
-{
- int ret;
-
-#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" ) );
-
- if( ( ret = mbedtls_ssl_send_fatal_handshake_failure( ssl ) ) != 0 )
- return( ret );
-
- 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" ) );
-
- if( ( ret = mbedtls_ssl_send_fatal_handshake_failure( ssl ) ) != 0 )
- return( ret );
-
- 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 )
- {
- 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 )
- {
- 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 )
- {
- 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 )
- {
- 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 )
- {
- 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;
-
- list_size = buf[0];
- if( list_size + 1 != len )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server hello message" ) );
- return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
- }
-
- 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" ) );
- 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 );
- 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 )
- 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 )
- return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
-
- list_len = ( buf[0] << 8 ) | buf[1];
- if( list_len != len - 2 )
- return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
-
- name_len = buf[2];
- if( name_len != list_len - 1 )
- 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 );
- }
- }
-
- 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" ) );
-
- /*
- * 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++;
- 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;
-#if defined(MBEDTLS_DEBUG_C)
- uint32_t t;
-#endif
-
- MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse server hello" ) );
-
- buf = ssl->in_msg;
-
- if( ( ret = mbedtls_ssl_read_record( ssl ) ) != 0 )
- {
- 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 renego" ) );
- return( MBEDTLS_ERR_SSL_WAITING_SERVER_HELLO_RENEGO );
- }
-#endif /* MBEDTLS_SSL_RENEGOTIATION */
-
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server hello 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" ) );
- 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 );
- }
-
-#if defined(MBEDTLS_DEBUG_C)
- t = ( (uint32_t) buf[2] << 24 )
- | ( (uint32_t) buf[3] << 16 )
- | ( (uint32_t) buf[4] << 8 )
- | ( (uint32_t) buf[5] );
- MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, current time: %lu", t ) );
-#endif
-
- 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" ) );
- 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" ) );
- 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" ) );
- 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 ) );
- 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 ) );
- 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 );
- 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] ) );
-
- suite_info = mbedtls_ssl_ciphersuite_from_id( ssl->session_negotiate->ciphersuite );
- if( suite_info == NULL
-#if defined(MBEDTLS_ARC4_C)
- || ( ssl->conf->arc4_disabled &&
- suite_info->cipher == MBEDTLS_CIPHER_ARC4_128 )
-#endif
- )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server hello message" ) );
- return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
- }
-
- MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, chosen ciphersuite: %s", suite_info->name ) );
-
- i = 0;
- while( 1 )
- {
- if( ssl->conf->ciphersuite_list[ssl->minor_ver][i] == 0 )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server hello message" ) );
- return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
- }
-
- if( ssl->conf->ciphersuite_list[ssl->minor_ver][i++] ==
- ssl->session_negotiate->ciphersuite )
- {
- break;
- }
- }
-
- 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" ) );
- 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" ) );
- 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 )
- {
- if( ( ret = mbedtls_ssl_send_fatal_handshake_failure( ssl ) ) != 0 )
- return( ret );
-
- 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;
-
- /*
- * 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 );
- }
-
- if( ssl->handshake->dhm_ctx.len * 8 < ssl->conf->dhm_min_bitlen )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "DHM prime too short: %d < %d",
- ssl->handshake->dhm_ctx.len * 8,
- 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;
-
- curve_info = mbedtls_ecp_curve_info_from_grp_id( ssl->handshake->ecdh_ctx.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, ssl->handshake->ecdh_ctx.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_ECP( 3, "ECDH: Qp", &ssl->handshake->ecdh_ctx.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 );
- 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>;
- */
- len = (*p)[0] << 8 | (*p)[1];
- *p += 2;
-
- if( (*p) + len > end )
- {
- 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_MAX_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_MAX_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 "
- "that was not offered" ) );
- 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, *end;
-
- 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 );
- 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( ( ret = mbedtls_ssl_read_record( ssl ) ) != 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" ) );
- 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 )
- {
- ssl->record_read = 1;
- goto exit;
- }
-
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server key exchange message" ) );
- return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE );
- }
-
- 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" ) );
- 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" ) );
- 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" ) );
- 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 );
- 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_DHE_RSA_ENABLED) || \
- defined(MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED) || \
- defined(MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED)
- if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_RSA ||
- ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_RSA ||
- ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA )
- {
- 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;
-
- /*
- * 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" ) );
- 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" ) );
- 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
- */
- sig_len = ( p[0] << 8 ) | p[1];
- p += 2;
-
- if( end != p + sig_len )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server key exchange message" ) );
- 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 )
- {
- mbedtls_md5_context mbedtls_md5;
- mbedtls_sha1_context mbedtls_sha1;
-
- mbedtls_md5_init( &mbedtls_md5 );
- mbedtls_sha1_init( &mbedtls_sha1 );
-
- hashlen = 36;
-
- /*
- * digitally-signed struct {
- * opaque md5_hash[16];
- * opaque sha_hash[20];
- * };
- *
- * md5_hash
- * MD5(ClientHello.random + ServerHello.random
- * + ServerParams);
- * sha_hash
- * SHA(ClientHello.random + ServerHello.random
- * + ServerParams);
- */
- mbedtls_md5_starts( &mbedtls_md5 );
- mbedtls_md5_update( &mbedtls_md5, ssl->handshake->randbytes, 64 );
- mbedtls_md5_update( &mbedtls_md5, params, params_len );
- mbedtls_md5_finish( &mbedtls_md5, hash );
-
- mbedtls_sha1_starts( &mbedtls_sha1 );
- mbedtls_sha1_update( &mbedtls_sha1, ssl->handshake->randbytes, 64 );
- mbedtls_sha1_update( &mbedtls_sha1, params, params_len );
- mbedtls_sha1_finish( &mbedtls_sha1, hash + 16 );
-
- mbedtls_md5_free( &mbedtls_md5 );
- mbedtls_sha1_free( &mbedtls_sha1 );
- }
- 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 )
- {
- mbedtls_md_context_t ctx;
-
- mbedtls_md_init( &ctx );
-
- /* Info from md_alg will be used instead */
- hashlen = 0;
-
- /*
- * digitally-signed struct {
- * opaque client_random[32];
- * opaque server_random[32];
- * ServerDHParams params;
- * };
- */
- if( ( ret = mbedtls_md_setup( &ctx,
- mbedtls_md_info_from_type( md_alg ), 0 ) ) != 0 )
- {
- MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_md_setup", ret );
- return( ret );
- }
-
- mbedtls_md_starts( &ctx );
- mbedtls_md_update( &ctx, ssl->handshake->randbytes, 64 );
- mbedtls_md_update( &ctx, params, params_len );
- mbedtls_md_finish( &ctx, hash );
- mbedtls_md_free( &ctx );
- }
- 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 != 0 ? hashlen :
- (unsigned int) ( mbedtls_md_get_size( mbedtls_md_info_from_type( md_alg ) ) ) );
-
- if( ssl->session_negotiate->peer_cert == NULL )
- {
- MBEDTLS_SSL_DEBUG_MSG( 2, ( "certificate required" ) );
- 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" ) );
- return( MBEDTLS_ERR_SSL_PK_TYPE_MISMATCH );
- }
-
- if( ( ret = mbedtls_pk_verify( &ssl->session_negotiate->peer_cert->pk,
- md_alg, hash, hashlen, p, sig_len ) ) != 0 )
- {
- MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_pk_verify", ret );
- return( ret );
- }
- }
-#endif /* MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED ||
- MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED ||
- MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED */
-
-exit:
- ssl->state++;
-
- MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse server key exchange" ) );
-
- return( 0 );
-}
-
-#if !defined(MBEDTLS_KEY_EXCHANGE_RSA_ENABLED) && \
- !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_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( 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 ||
- ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECJPAKE )
- {
- 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
-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( 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 ||
- ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECJPAKE )
- {
- MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip parse certificate request" ) );
- ssl->state++;
- return( 0 );
- }
-
- if( ssl->record_read == 0 )
- {
- if( ( ret = mbedtls_ssl_read_record( ssl ) ) != 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" ) );
- return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE );
- }
-
- ssl->record_read = 1;
- }
-
- ssl->client_auth = 0;
- ssl->state++;
-
- if( ssl->in_msg[0] == MBEDTLS_SSL_HS_CERTIFICATE_REQUEST )
- ssl->client_auth++;
-
- MBEDTLS_SSL_DEBUG_MSG( 3, ( "got %s certificate request",
- ssl->client_auth ? "a" : "no" ) );
-
- if( ssl->client_auth == 0 )
- goto exit;
-
- ssl->record_read = 0;
-
- /*
- * 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 */
- cert_type_len = buf[mbedtls_ssl_hs_hdr_len( ssl )];
- n = cert_type_len;
-
- if( ssl->in_hslen < mbedtls_ssl_hs_hdr_len( ssl ) + 2 + n )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate request message" ) );
- 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] ) );
-
- n += 2 + sig_alg_len;
-
- if( ssl->in_hslen < mbedtls_ssl_hs_hdr_len( ssl ) + 2 + n )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate request message" ) );
- return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE_REQUEST );
- }
- }
-#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" ) );
- return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE_REQUEST );
- }
-
-exit:
- MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse certificate request" ) );
-
- return( 0 );
-}
-#endif /* !MBEDTLS_KEY_EXCHANGE_RSA_ENABLED &&
- !MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED &&
- !MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED &&
- !MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED */
-
-static int ssl_parse_server_hello_done( mbedtls_ssl_context *ssl )
-{
- int ret;
-
- MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse server hello done" ) );
-
- if( ssl->record_read == 0 )
- {
- if( ( ret = mbedtls_ssl_read_record( ssl ) ) != 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 );
- }
- }
- ssl->record_read = 0;
-
- 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" ) );
- 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;
-
- 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 );
- return( ret );
- }
-
- MBEDTLS_SSL_DEBUG_ECP( 3, "ECDH: Q", &ssl->handshake->ecdh_ctx.Q );
-
- if( ( ret = mbedtls_ecdh_calc_secret( &ssl->handshake->ecdh_ctx,
- &ssl->handshake->pmslen,
- ssl->handshake->premaster,
- MBEDTLS_MPI_MAX_SIZE,
- ssl->conf->f_rng, ssl->conf->p_rng ) ) != 0 )
- {
- MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecdh_calc_secret", ret );
- return( ret );
- }
-
- MBEDTLS_SSL_DEBUG_MPI( 3, "ECDH: z", &ssl->handshake->ecdh_ctx.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( 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 )
- {
- /*
- * 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_MAX_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_MAX_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_MAX_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_ECP( 3, "ECDH: Q", &ssl->handshake->ecdh_ctx.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_MAX_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_record( ssl ) ) != 0 )
- {
- MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_record", 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_ECDHE_RSA_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;
-
- 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 );
- }
-
- 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 an RSA signature of the handshake digests
- */
- 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( ( ret = mbedtls_pk_sign( mbedtls_ssl_own_key( ssl ), md_alg, hash_start, hashlen,
- ssl->out_msg + 6 + offset, &n,
- ssl->conf->f_rng, ssl->conf->p_rng ) ) != 0 )
- {
- MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_pk_sign", ret );
- 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_record( ssl ) ) != 0 )
- {
- MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_record", 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_ECDHE_RSA_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 ) ) != 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" ) );
- 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" ) );
- return( MBEDTLS_ERR_SSL_BAD_HS_NEW_SESSION_TICKET );
- }
-
- msg = ssl->in_msg + mbedtls_ssl_hs_hdr_len( ssl );
-
- lifetime = ( 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" ) );
- 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_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" ) );
- 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_resend( ssl ) ) != 0 )
- return( ret );
- }
-#endif
-
- /* 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 */
