Maxim nexpaq
Preliminary main mbed library for nexpaq development
Diff: features/mbedtls/src/ssl_cli.c
- Revision:
- 0:6c56fb4bc5f0
diff -r 000000000000 -r 6c56fb4bc5f0 features/mbedtls/src/ssl_cli.c
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/features/mbedtls/src/ssl_cli.c Fri Nov 04 20:27:58 2016 +0000
@@ -0,0 +1,3380 @@
+/*
+ * 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
+#define mbedtls_time time
+#define mbedtls_time_t time_t
+#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 <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 */