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library/ssl_cli.c@0:cdf462088d13, 2017-01-05 (annotated)

Committer:: markrad
Date:: Thu Jan 05 00:18:44 2017 +0000
Revision:: 0:cdf462088d13

Initial commit

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User	Revision	Line number	New contents of line
markrad	0:cdf462088d13	1	/*
markrad	0:cdf462088d13	2	* SSLv3/TLSv1 client-side functions
markrad	0:cdf462088d13	3	*
markrad	0:cdf462088d13	4	* Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
markrad	0:cdf462088d13	5	* SPDX-License-Identifier: Apache-2.0
markrad	0:cdf462088d13	6	*
markrad	0:cdf462088d13	7	* Licensed under the Apache License, Version 2.0 (the "License"); you may
markrad	0:cdf462088d13	8	* not use this file except in compliance with the License.
markrad	0:cdf462088d13	9	* You may obtain a copy of the License at
markrad	0:cdf462088d13	10	*
markrad	0:cdf462088d13	11	* http://www.apache.org/licenses/LICENSE-2.0
markrad	0:cdf462088d13	12	*
markrad	0:cdf462088d13	13	* Unless required by applicable law or agreed to in writing, software
markrad	0:cdf462088d13	14	* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
markrad	0:cdf462088d13	15	* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
markrad	0:cdf462088d13	16	* See the License for the specific language governing permissions and
markrad	0:cdf462088d13	17	* limitations under the License.
markrad	0:cdf462088d13	18	*
markrad	0:cdf462088d13	19	* This file is part of mbed TLS (https://tls.mbed.org)
markrad	0:cdf462088d13	20	*/
markrad	0:cdf462088d13	21
markrad	0:cdf462088d13	22	#if !defined(MBEDTLS_CONFIG_FILE)
markrad	0:cdf462088d13	23	#include "mbedtls/config.h"
markrad	0:cdf462088d13	24	#else
markrad	0:cdf462088d13	25	#include MBEDTLS_CONFIG_FILE
markrad	0:cdf462088d13	26	#endif
markrad	0:cdf462088d13	27
markrad	0:cdf462088d13	28	#if defined(MBEDTLS_SSL_CLI_C)
markrad	0:cdf462088d13	29
markrad	0:cdf462088d13	30	#if defined(MBEDTLS_PLATFORM_C)
markrad	0:cdf462088d13	31	#include "mbedtls/platform.h"
markrad	0:cdf462088d13	32	#else
markrad	0:cdf462088d13	33	#include <stdlib.h>
markrad	0:cdf462088d13	34	#define mbedtls_calloc calloc
markrad	0:cdf462088d13	35	#define mbedtls_free free
markrad	0:cdf462088d13	36	#endif
markrad	0:cdf462088d13	37
markrad	0:cdf462088d13	38	#include "mbedtls/debug.h"
markrad	0:cdf462088d13	39	#include "mbedtls/ssl.h"
markrad	0:cdf462088d13	40	#include "mbedtls/ssl_internal.h"
markrad	0:cdf462088d13	41
markrad	0:cdf462088d13	42	#include <string.h>
markrad	0:cdf462088d13	43
markrad	0:cdf462088d13	44	#include <stdint.h>
markrad	0:cdf462088d13	45
markrad	0:cdf462088d13	46	#if defined(MBEDTLS_HAVE_TIME)
markrad	0:cdf462088d13	47	#include "mbedtls/platform_time.h"
markrad	0:cdf462088d13	48	#endif
markrad	0:cdf462088d13	49
markrad	0:cdf462088d13	50	#if defined(MBEDTLS_SSL_SESSION_TICKETS)
markrad	0:cdf462088d13	51	/* Implementation that should never be optimized out by the compiler */
markrad	0:cdf462088d13	52	static void mbedtls_zeroize( void *v, size_t n ) {
markrad	0:cdf462088d13	53	volatile unsigned char p = v; while( n-- ) p++ = 0;
markrad	0:cdf462088d13	54	}
markrad	0:cdf462088d13	55	#endif
markrad	0:cdf462088d13	56
markrad	0:cdf462088d13	57	#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
markrad	0:cdf462088d13	58	static void ssl_write_hostname_ext( mbedtls_ssl_context *ssl,
markrad	0:cdf462088d13	59	unsigned char *buf,
markrad	0:cdf462088d13	60	size_t *olen )
markrad	0:cdf462088d13	61	{
markrad	0:cdf462088d13	62	unsigned char *p = buf;
markrad	0:cdf462088d13	63	const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_MAX_CONTENT_LEN;
markrad	0:cdf462088d13	64	size_t hostname_len;
markrad	0:cdf462088d13	65
markrad	0:cdf462088d13	66	*olen = 0;
markrad	0:cdf462088d13	67
markrad	0:cdf462088d13	68	if( ssl->hostname == NULL )
markrad	0:cdf462088d13	69	return;
markrad	0:cdf462088d13	70
markrad	0:cdf462088d13	71	MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, adding server name extension: %s",
markrad	0:cdf462088d13	72	ssl->hostname ) );
markrad	0:cdf462088d13	73
markrad	0:cdf462088d13	74	hostname_len = strlen( ssl->hostname );
markrad	0:cdf462088d13	75
markrad	0:cdf462088d13	76	if( end < p \|\| (size_t)( end - p ) < hostname_len + 9 )
markrad	0:cdf462088d13	77	{
markrad	0:cdf462088d13	78	MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small" ) );
markrad	0:cdf462088d13	79	return;
markrad	0:cdf462088d13	80	}
markrad	0:cdf462088d13	81
markrad	0:cdf462088d13	82	/*
markrad	0:cdf462088d13	83	* struct {
markrad	0:cdf462088d13	84	* NameType name_type;
markrad	0:cdf462088d13	85	* select (name_type) {
markrad	0:cdf462088d13	86	* case host_name: HostName;
markrad	0:cdf462088d13	87	* } name;
markrad	0:cdf462088d13	88	* } ServerName;
markrad	0:cdf462088d13	89	*
markrad	0:cdf462088d13	90	* enum {
markrad	0:cdf462088d13	91	* host_name(0), (255)
markrad	0:cdf462088d13	92	* } NameType;
markrad	0:cdf462088d13	93	*
markrad	0:cdf462088d13	94	* opaque HostName<1..2^16-1>;
markrad	0:cdf462088d13	95	*
markrad	0:cdf462088d13	96	* struct {
markrad	0:cdf462088d13	97	* ServerName server_name_list<1..2^16-1>
markrad	0:cdf462088d13	98	* } ServerNameList;
markrad	0:cdf462088d13	99	*/
markrad	0:cdf462088d13	100	*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SERVERNAME >> 8 ) & 0xFF );
markrad	0:cdf462088d13	101	*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SERVERNAME ) & 0xFF );
markrad	0:cdf462088d13	102
markrad	0:cdf462088d13	103	*p++ = (unsigned char)( ( (hostname_len + 5) >> 8 ) & 0xFF );
markrad	0:cdf462088d13	104	*p++ = (unsigned char)( ( (hostname_len + 5) ) & 0xFF );
markrad	0:cdf462088d13	105
markrad	0:cdf462088d13	106	*p++ = (unsigned char)( ( (hostname_len + 3) >> 8 ) & 0xFF );
markrad	0:cdf462088d13	107	*p++ = (unsigned char)( ( (hostname_len + 3) ) & 0xFF );
markrad	0:cdf462088d13	108
markrad	0:cdf462088d13	109	*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SERVERNAME_HOSTNAME ) & 0xFF );
markrad	0:cdf462088d13	110	*p++ = (unsigned char)( ( hostname_len >> 8 ) & 0xFF );
markrad	0:cdf462088d13	111	*p++ = (unsigned char)( ( hostname_len ) & 0xFF );
markrad	0:cdf462088d13	112
markrad	0:cdf462088d13	113	memcpy( p, ssl->hostname, hostname_len );
markrad	0:cdf462088d13	114
markrad	0:cdf462088d13	115	*olen = hostname_len + 9;
markrad	0:cdf462088d13	116	}
markrad	0:cdf462088d13	117	#endif /* MBEDTLS_SSL_SERVER_NAME_INDICATION */
markrad	0:cdf462088d13	118
markrad	0:cdf462088d13	119	#if defined(MBEDTLS_SSL_RENEGOTIATION)
markrad	0:cdf462088d13	120	static void ssl_write_renegotiation_ext( mbedtls_ssl_context *ssl,
markrad	0:cdf462088d13	121	unsigned char *buf,
markrad	0:cdf462088d13	122	size_t *olen )
markrad	0:cdf462088d13	123	{
markrad	0:cdf462088d13	124	unsigned char *p = buf;
markrad	0:cdf462088d13	125	const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_MAX_CONTENT_LEN;
markrad	0:cdf462088d13	126
markrad	0:cdf462088d13	127	*olen = 0;
markrad	0:cdf462088d13	128
markrad	0:cdf462088d13	129	if( ssl->renego_status != MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS )
markrad	0:cdf462088d13	130	return;
markrad	0:cdf462088d13	131
markrad	0:cdf462088d13	132	MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, adding renegotiation extension" ) );
markrad	0:cdf462088d13	133
markrad	0:cdf462088d13	134	if( end < p \|\| (size_t)( end - p ) < 5 + ssl->verify_data_len )
markrad	0:cdf462088d13	135	{
markrad	0:cdf462088d13	136	MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small" ) );
markrad	0:cdf462088d13	137	return;
markrad	0:cdf462088d13	138	}
markrad	0:cdf462088d13	139
markrad	0:cdf462088d13	140	/*
markrad	0:cdf462088d13	141	* Secure renegotiation
markrad	0:cdf462088d13	142	*/
markrad	0:cdf462088d13	143	*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_RENEGOTIATION_INFO >> 8 ) & 0xFF );
markrad	0:cdf462088d13	144	*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_RENEGOTIATION_INFO ) & 0xFF );
markrad	0:cdf462088d13	145
markrad	0:cdf462088d13	146	*p++ = 0x00;
markrad	0:cdf462088d13	147	*p++ = ( ssl->verify_data_len + 1 ) & 0xFF;
markrad	0:cdf462088d13	148	*p++ = ssl->verify_data_len & 0xFF;
markrad	0:cdf462088d13	149
markrad	0:cdf462088d13	150	memcpy( p, ssl->own_verify_data, ssl->verify_data_len );
markrad	0:cdf462088d13	151
markrad	0:cdf462088d13	152	*olen = 5 + ssl->verify_data_len;
markrad	0:cdf462088d13	153	}
markrad	0:cdf462088d13	154	#endif /* MBEDTLS_SSL_RENEGOTIATION */
markrad	0:cdf462088d13	155
markrad	0:cdf462088d13	156	/*
markrad	0:cdf462088d13	157	* Only if we handle at least one key exchange that needs signatures.
markrad	0:cdf462088d13	158	*/
markrad	0:cdf462088d13	159	#if defined(MBEDTLS_SSL_PROTO_TLS1_2) && \
markrad	0:cdf462088d13	160	defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED)
markrad	0:cdf462088d13	161	static void ssl_write_signature_algorithms_ext( mbedtls_ssl_context *ssl,
markrad	0:cdf462088d13	162	unsigned char *buf,
markrad	0:cdf462088d13	163	size_t *olen )
markrad	0:cdf462088d13	164	{
markrad	0:cdf462088d13	165	unsigned char *p = buf;
markrad	0:cdf462088d13	166	const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_MAX_CONTENT_LEN;
markrad	0:cdf462088d13	167	size_t sig_alg_len = 0;
markrad	0:cdf462088d13	168	const int *md;
markrad	0:cdf462088d13	169	#if defined(MBEDTLS_RSA_C) \|\| defined(MBEDTLS_ECDSA_C)
markrad	0:cdf462088d13	170	unsigned char *sig_alg_list = buf + 6;
markrad	0:cdf462088d13	171	#endif
markrad	0:cdf462088d13	172
markrad	0:cdf462088d13	173	*olen = 0;
markrad	0:cdf462088d13	174
markrad	0:cdf462088d13	175	if( ssl->conf->max_minor_ver != MBEDTLS_SSL_MINOR_VERSION_3 )
markrad	0:cdf462088d13	176	return;
markrad	0:cdf462088d13	177
markrad	0:cdf462088d13	178	MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, adding signature_algorithms extension" ) );
markrad	0:cdf462088d13	179
markrad	0:cdf462088d13	180	for( md = ssl->conf->sig_hashes; *md != MBEDTLS_MD_NONE; md++ )
markrad	0:cdf462088d13	181	{
markrad	0:cdf462088d13	182	#if defined(MBEDTLS_ECDSA_C)
markrad	0:cdf462088d13	183	sig_alg_len += 2;
markrad	0:cdf462088d13	184	#endif
markrad	0:cdf462088d13	185	#if defined(MBEDTLS_RSA_C)
markrad	0:cdf462088d13	186	sig_alg_len += 2;
markrad	0:cdf462088d13	187	#endif
markrad	0:cdf462088d13	188	}
markrad	0:cdf462088d13	189
markrad	0:cdf462088d13	190	if( end < p \|\| (size_t)( end - p ) < sig_alg_len + 6 )
markrad	0:cdf462088d13	191	{
markrad	0:cdf462088d13	192	MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small" ) );
markrad	0:cdf462088d13	193	return;
markrad	0:cdf462088d13	194	}
markrad	0:cdf462088d13	195
markrad	0:cdf462088d13	196	/*
markrad	0:cdf462088d13	197	* Prepare signature_algorithms extension (TLS 1.2)
markrad	0:cdf462088d13	198	*/
markrad	0:cdf462088d13	199	sig_alg_len = 0;
markrad	0:cdf462088d13	200
markrad	0:cdf462088d13	201	for( md = ssl->conf->sig_hashes; *md != MBEDTLS_MD_NONE; md++ )
markrad	0:cdf462088d13	202	{
markrad	0:cdf462088d13	203	#if defined(MBEDTLS_ECDSA_C)
markrad	0:cdf462088d13	204	sig_alg_list[sig_alg_len++] = mbedtls_ssl_hash_from_md_alg( *md );
markrad	0:cdf462088d13	205	sig_alg_list[sig_alg_len++] = MBEDTLS_SSL_SIG_ECDSA;
markrad	0:cdf462088d13	206	#endif
markrad	0:cdf462088d13	207	#if defined(MBEDTLS_RSA_C)
markrad	0:cdf462088d13	208	sig_alg_list[sig_alg_len++] = mbedtls_ssl_hash_from_md_alg( *md );
markrad	0:cdf462088d13	209	sig_alg_list[sig_alg_len++] = MBEDTLS_SSL_SIG_RSA;
markrad	0:cdf462088d13	210	#endif
markrad	0:cdf462088d13	211	}
markrad	0:cdf462088d13	212
markrad	0:cdf462088d13	213	/*
markrad	0:cdf462088d13	214	* enum {
markrad	0:cdf462088d13	215	* none(0), md5(1), sha1(2), sha224(3), sha256(4), sha384(5),
markrad	0:cdf462088d13	216	* sha512(6), (255)
markrad	0:cdf462088d13	217	* } HashAlgorithm;
markrad	0:cdf462088d13	218	*
markrad	0:cdf462088d13	219	* enum { anonymous(0), rsa(1), dsa(2), ecdsa(3), (255) }
markrad	0:cdf462088d13	220	* SignatureAlgorithm;
markrad	0:cdf462088d13	221	*
markrad	0:cdf462088d13	222	* struct {
markrad	0:cdf462088d13	223	* HashAlgorithm hash;
markrad	0:cdf462088d13	224	* SignatureAlgorithm signature;
markrad	0:cdf462088d13	225	* } SignatureAndHashAlgorithm;
markrad	0:cdf462088d13	226	*
markrad	0:cdf462088d13	227	* SignatureAndHashAlgorithm
markrad	0:cdf462088d13	228	* supported_signature_algorithms<2..2^16-2>;
markrad	0:cdf462088d13	229	*/
markrad	0:cdf462088d13	230	*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SIG_ALG >> 8 ) & 0xFF );
markrad	0:cdf462088d13	231	*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SIG_ALG ) & 0xFF );
markrad	0:cdf462088d13	232
markrad	0:cdf462088d13	233	*p++ = (unsigned char)( ( ( sig_alg_len + 2 ) >> 8 ) & 0xFF );
markrad	0:cdf462088d13	234	*p++ = (unsigned char)( ( ( sig_alg_len + 2 ) ) & 0xFF );
markrad	0:cdf462088d13	235
markrad	0:cdf462088d13	236	*p++ = (unsigned char)( ( sig_alg_len >> 8 ) & 0xFF );
markrad	0:cdf462088d13	237	*p++ = (unsigned char)( ( sig_alg_len ) & 0xFF );
markrad	0:cdf462088d13	238
markrad	0:cdf462088d13	239	*olen = 6 + sig_alg_len;
markrad	0:cdf462088d13	240	}
markrad	0:cdf462088d13	241	#endif /* MBEDTLS_SSL_PROTO_TLS1_2 &&
markrad	0:cdf462088d13	242	MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED */
markrad	0:cdf462088d13	243
markrad	0:cdf462088d13	244	#if defined(MBEDTLS_ECDH_C) \|\| defined(MBEDTLS_ECDSA_C) \|\| \
markrad	0:cdf462088d13	245	defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
markrad	0:cdf462088d13	246	static void ssl_write_supported_elliptic_curves_ext( mbedtls_ssl_context *ssl,
markrad	0:cdf462088d13	247	unsigned char *buf,
markrad	0:cdf462088d13	248	size_t *olen )
markrad	0:cdf462088d13	249	{
markrad	0:cdf462088d13	250	unsigned char *p = buf;
markrad	0:cdf462088d13	251	const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_MAX_CONTENT_LEN;
markrad	0:cdf462088d13	252	unsigned char *elliptic_curve_list = p + 6;
markrad	0:cdf462088d13	253	size_t elliptic_curve_len = 0;
markrad	0:cdf462088d13	254	const mbedtls_ecp_curve_info *info;
markrad	0:cdf462088d13	255	#if defined(MBEDTLS_ECP_C)
markrad	0:cdf462088d13	256	const mbedtls_ecp_group_id *grp_id;
markrad	0:cdf462088d13	257	#else
markrad	0:cdf462088d13	258	((void) ssl);
markrad	0:cdf462088d13	259	#endif
markrad	0:cdf462088d13	260
markrad	0:cdf462088d13	261	*olen = 0;
markrad	0:cdf462088d13	262
markrad	0:cdf462088d13	263	MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, adding supported_elliptic_curves extension" ) );
markrad	0:cdf462088d13	264
markrad	0:cdf462088d13	265	#if defined(MBEDTLS_ECP_C)
markrad	0:cdf462088d13	266	for( grp_id = ssl->conf->curve_list; *grp_id != MBEDTLS_ECP_DP_NONE; grp_id++ )
markrad	0:cdf462088d13	267	{
markrad	0:cdf462088d13	268	info = mbedtls_ecp_curve_info_from_grp_id( *grp_id );
markrad	0:cdf462088d13	269	#else
markrad	0:cdf462088d13	270	for( info = mbedtls_ecp_curve_list(); info->grp_id != MBEDTLS_ECP_DP_NONE; info++ )
markrad	0:cdf462088d13	271	{
markrad	0:cdf462088d13	272	#endif
markrad	0:cdf462088d13	273	if( info == NULL )
markrad	0:cdf462088d13	274	{
markrad	0:cdf462088d13	275	MBEDTLS_SSL_DEBUG_MSG( 1, ( "invalid curve in ssl configuration" ) );
markrad	0:cdf462088d13	276	return;
markrad	0:cdf462088d13	277	}
markrad	0:cdf462088d13	278
markrad	0:cdf462088d13	279	elliptic_curve_len += 2;
markrad	0:cdf462088d13	280	}
markrad	0:cdf462088d13	281
markrad	0:cdf462088d13	282	if( end < p \|\| (size_t)( end - p ) < 6 + elliptic_curve_len )
markrad	0:cdf462088d13	283	{
markrad	0:cdf462088d13	284	MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small" ) );
markrad	0:cdf462088d13	285	return;
markrad	0:cdf462088d13	286	}
markrad	0:cdf462088d13	287
markrad	0:cdf462088d13	288	elliptic_curve_len = 0;
markrad	0:cdf462088d13	289
markrad	0:cdf462088d13	290	#if defined(MBEDTLS_ECP_C)
markrad	0:cdf462088d13	291	for( grp_id = ssl->conf->curve_list; *grp_id != MBEDTLS_ECP_DP_NONE; grp_id++ )
markrad	0:cdf462088d13	292	{
markrad	0:cdf462088d13	293	info = mbedtls_ecp_curve_info_from_grp_id( *grp_id );
markrad	0:cdf462088d13	294	#else
markrad	0:cdf462088d13	295	for( info = mbedtls_ecp_curve_list(); info->grp_id != MBEDTLS_ECP_DP_NONE; info++ )
markrad	0:cdf462088d13	296	{
markrad	0:cdf462088d13	297	#endif
markrad	0:cdf462088d13	298	elliptic_curve_list[elliptic_curve_len++] = info->tls_id >> 8;
markrad	0:cdf462088d13	299	elliptic_curve_list[elliptic_curve_len++] = info->tls_id & 0xFF;
markrad	0:cdf462088d13	300	}
markrad	0:cdf462088d13	301
markrad	0:cdf462088d13	302	if( elliptic_curve_len == 0 )
markrad	0:cdf462088d13	303	return;
markrad	0:cdf462088d13	304
markrad	0:cdf462088d13	305	*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SUPPORTED_ELLIPTIC_CURVES >> 8 ) & 0xFF );
markrad	0:cdf462088d13	306	*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SUPPORTED_ELLIPTIC_CURVES ) & 0xFF );
markrad	0:cdf462088d13	307
markrad	0:cdf462088d13	308	*p++ = (unsigned char)( ( ( elliptic_curve_len + 2 ) >> 8 ) & 0xFF );
markrad	0:cdf462088d13	309	*p++ = (unsigned char)( ( ( elliptic_curve_len + 2 ) ) & 0xFF );
markrad	0:cdf462088d13	310
markrad	0:cdf462088d13	311	*p++ = (unsigned char)( ( ( elliptic_curve_len ) >> 8 ) & 0xFF );
markrad	0:cdf462088d13	312	*p++ = (unsigned char)( ( ( elliptic_curve_len ) ) & 0xFF );
markrad	0:cdf462088d13	313
markrad	0:cdf462088d13	314	*olen = 6 + elliptic_curve_len;
markrad	0:cdf462088d13	315	}
markrad	0:cdf462088d13	316
markrad	0:cdf462088d13	317	static void ssl_write_supported_point_formats_ext( mbedtls_ssl_context *ssl,
markrad	0:cdf462088d13	318	unsigned char *buf,
markrad	0:cdf462088d13	319	size_t *olen )
markrad	0:cdf462088d13	320	{
markrad	0:cdf462088d13	321	unsigned char *p = buf;
markrad	0:cdf462088d13	322	const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_MAX_CONTENT_LEN;
markrad	0:cdf462088d13	323
markrad	0:cdf462088d13	324	*olen = 0;
markrad	0:cdf462088d13	325
markrad	0:cdf462088d13	326	MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, adding supported_point_formats extension" ) );
markrad	0:cdf462088d13	327
markrad	0:cdf462088d13	328	if( end < p \|\| (size_t)( end - p ) < 6 )
markrad	0:cdf462088d13	329	{
markrad	0:cdf462088d13	330	MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small" ) );
markrad	0:cdf462088d13	331	return;
markrad	0:cdf462088d13	332	}
markrad	0:cdf462088d13	333
markrad	0:cdf462088d13	334	*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SUPPORTED_POINT_FORMATS >> 8 ) & 0xFF );
markrad	0:cdf462088d13	335	*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SUPPORTED_POINT_FORMATS ) & 0xFF );
markrad	0:cdf462088d13	336
markrad	0:cdf462088d13	337	*p++ = 0x00;
markrad	0:cdf462088d13	338	*p++ = 2;
markrad	0:cdf462088d13	339
markrad	0:cdf462088d13	340	*p++ = 1;
markrad	0:cdf462088d13	341	*p++ = MBEDTLS_ECP_PF_UNCOMPRESSED;
markrad	0:cdf462088d13	342
markrad	0:cdf462088d13	343	*olen = 6;
markrad	0:cdf462088d13	344	}
markrad	0:cdf462088d13	345	#endif /* MBEDTLS_ECDH_C \|\| MBEDTLS_ECDSA_C \|\|
markrad	0:cdf462088d13	346	MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */
markrad	0:cdf462088d13	347
markrad	0:cdf462088d13	348	#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
markrad	0:cdf462088d13	349	static void ssl_write_ecjpake_kkpp_ext( mbedtls_ssl_context *ssl,
markrad	0:cdf462088d13	350	unsigned char *buf,
markrad	0:cdf462088d13	351	size_t *olen )
markrad	0:cdf462088d13	352	{
markrad	0:cdf462088d13	353	int ret;
markrad	0:cdf462088d13	354	unsigned char *p = buf;
markrad	0:cdf462088d13	355	const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_MAX_CONTENT_LEN;
markrad	0:cdf462088d13	356	size_t kkpp_len;
markrad	0:cdf462088d13	357
markrad	0:cdf462088d13	358	*olen = 0;
markrad	0:cdf462088d13	359
markrad	0:cdf462088d13	360	/* Skip costly extension if we can't use EC J-PAKE anyway */
markrad	0:cdf462088d13	361	if( mbedtls_ecjpake_check( &ssl->handshake->ecjpake_ctx ) != 0 )
markrad	0:cdf462088d13	362	return;
markrad	0:cdf462088d13	363
markrad	0:cdf462088d13	364	MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, adding ecjpake_kkpp extension" ) );
markrad	0:cdf462088d13	365
markrad	0:cdf462088d13	366	if( end - p < 4 )
markrad	0:cdf462088d13	367	{
markrad	0:cdf462088d13	368	MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small" ) );
markrad	0:cdf462088d13	369	return;
markrad	0:cdf462088d13	370	}
markrad	0:cdf462088d13	371
markrad	0:cdf462088d13	372	*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_ECJPAKE_KKPP >> 8 ) & 0xFF );
markrad	0:cdf462088d13	373	*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_ECJPAKE_KKPP ) & 0xFF );
markrad	0:cdf462088d13	374
markrad	0:cdf462088d13	375	/*
markrad	0:cdf462088d13	376	* We may need to send ClientHello multiple times for Hello verification.
markrad	0:cdf462088d13	377	* We don't want to compute fresh values every time (both for performance
markrad	0:cdf462088d13	378	* and consistency reasons), so cache the extension content.
markrad	0:cdf462088d13	379	*/
markrad	0:cdf462088d13	380	if( ssl->handshake->ecjpake_cache == NULL \|\|
markrad	0:cdf462088d13	381	ssl->handshake->ecjpake_cache_len == 0 )
markrad	0:cdf462088d13	382	{
markrad	0:cdf462088d13	383	MBEDTLS_SSL_DEBUG_MSG( 3, ( "generating new ecjpake parameters" ) );
markrad	0:cdf462088d13	384
markrad	0:cdf462088d13	385	ret = mbedtls_ecjpake_write_round_one( &ssl->handshake->ecjpake_ctx,
markrad	0:cdf462088d13	386	p + 2, end - p - 2, &kkpp_len,
markrad	0:cdf462088d13	387	ssl->conf->f_rng, ssl->conf->p_rng );
markrad	0:cdf462088d13	388	if( ret != 0 )
markrad	0:cdf462088d13	389	{
markrad	0:cdf462088d13	390	MBEDTLS_SSL_DEBUG_RET( 1 , "mbedtls_ecjpake_write_round_one", ret );
markrad	0:cdf462088d13	391	return;
markrad	0:cdf462088d13	392	}
markrad	0:cdf462088d13	393
markrad	0:cdf462088d13	394	ssl->handshake->ecjpake_cache = mbedtls_calloc( 1, kkpp_len );
markrad	0:cdf462088d13	395	if( ssl->handshake->ecjpake_cache == NULL )
markrad	0:cdf462088d13	396	{
markrad	0:cdf462088d13	397	MBEDTLS_SSL_DEBUG_MSG( 1, ( "allocation failed" ) );
markrad	0:cdf462088d13	398	return;
markrad	0:cdf462088d13	399	}
markrad	0:cdf462088d13	400
markrad	0:cdf462088d13	401	memcpy( ssl->handshake->ecjpake_cache, p + 2, kkpp_len );
markrad	0:cdf462088d13	402	ssl->handshake->ecjpake_cache_len = kkpp_len;
markrad	0:cdf462088d13	403	}
markrad	0:cdf462088d13	404	else
markrad	0:cdf462088d13	405	{
markrad	0:cdf462088d13	406	MBEDTLS_SSL_DEBUG_MSG( 3, ( "re-using cached ecjpake parameters" ) );
markrad	0:cdf462088d13	407
markrad	0:cdf462088d13	408	kkpp_len = ssl->handshake->ecjpake_cache_len;
markrad	0:cdf462088d13	409
markrad	0:cdf462088d13	410	if( (size_t)( end - p - 2 ) < kkpp_len )
markrad	0:cdf462088d13	411	{
markrad	0:cdf462088d13	412	MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small" ) );
markrad	0:cdf462088d13	413	return;
markrad	0:cdf462088d13	414	}
markrad	0:cdf462088d13	415
markrad	0:cdf462088d13	416	memcpy( p + 2, ssl->handshake->ecjpake_cache, kkpp_len );
markrad	0:cdf462088d13	417	}
markrad	0:cdf462088d13	418
markrad	0:cdf462088d13	419	*p++ = (unsigned char)( ( kkpp_len >> 8 ) & 0xFF );
markrad	0:cdf462088d13	420	*p++ = (unsigned char)( ( kkpp_len ) & 0xFF );
markrad	0:cdf462088d13	421
markrad	0:cdf462088d13	422	*olen = kkpp_len + 4;
markrad	0:cdf462088d13	423	}
markrad	0:cdf462088d13	424	#endif /* MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */
markrad	0:cdf462088d13	425
markrad	0:cdf462088d13	426	#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
markrad	0:cdf462088d13	427	static void ssl_write_max_fragment_length_ext( mbedtls_ssl_context *ssl,
markrad	0:cdf462088d13	428	unsigned char *buf,
markrad	0:cdf462088d13	429	size_t *olen )
markrad	0:cdf462088d13	430	{
markrad	0:cdf462088d13	431	unsigned char *p = buf;
markrad	0:cdf462088d13	432	const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_MAX_CONTENT_LEN;
markrad	0:cdf462088d13	433
markrad	0:cdf462088d13	434	*olen = 0;
markrad	0:cdf462088d13	435
markrad	0:cdf462088d13	436	if( ssl->conf->mfl_code == MBEDTLS_SSL_MAX_FRAG_LEN_NONE ) {
markrad	0:cdf462088d13	437	return;
markrad	0:cdf462088d13	438	}
markrad	0:cdf462088d13	439
markrad	0:cdf462088d13	440	MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, adding max_fragment_length extension" ) );
markrad	0:cdf462088d13	441
markrad	0:cdf462088d13	442	if( end < p \|\| (size_t)( end - p ) < 5 )
markrad	0:cdf462088d13	443	{
markrad	0:cdf462088d13	444	MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small" ) );
markrad	0:cdf462088d13	445	return;
markrad	0:cdf462088d13	446	}
markrad	0:cdf462088d13	447
markrad	0:cdf462088d13	448	*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_MAX_FRAGMENT_LENGTH >> 8 ) & 0xFF );
markrad	0:cdf462088d13	449	*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_MAX_FRAGMENT_LENGTH ) & 0xFF );
markrad	0:cdf462088d13	450
markrad	0:cdf462088d13	451	*p++ = 0x00;
markrad	0:cdf462088d13	452	*p++ = 1;
markrad	0:cdf462088d13	453
markrad	0:cdf462088d13	454	*p++ = ssl->conf->mfl_code;
markrad	0:cdf462088d13	455
markrad	0:cdf462088d13	456	*olen = 5;
markrad	0:cdf462088d13	457	}
markrad	0:cdf462088d13	458	#endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */
markrad	0:cdf462088d13	459
markrad	0:cdf462088d13	460	#if defined(MBEDTLS_SSL_TRUNCATED_HMAC)
markrad	0:cdf462088d13	461	static void ssl_write_truncated_hmac_ext( mbedtls_ssl_context *ssl,
markrad	0:cdf462088d13	462	unsigned char buf, size_t olen )
markrad	0:cdf462088d13	463	{
markrad	0:cdf462088d13	464	unsigned char *p = buf;
markrad	0:cdf462088d13	465	const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_MAX_CONTENT_LEN;
markrad	0:cdf462088d13	466
markrad	0:cdf462088d13	467	*olen = 0;
markrad	0:cdf462088d13	468
markrad	0:cdf462088d13	469	if( ssl->conf->trunc_hmac == MBEDTLS_SSL_TRUNC_HMAC_DISABLED )
markrad	0:cdf462088d13	470	{
markrad	0:cdf462088d13	471	return;
markrad	0:cdf462088d13	472	}
markrad	0:cdf462088d13	473
markrad	0:cdf462088d13	474	MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, adding truncated_hmac extension" ) );
markrad	0:cdf462088d13	475
markrad	0:cdf462088d13	476	if( end < p \|\| (size_t)( end - p ) < 4 )
markrad	0:cdf462088d13	477	{
markrad	0:cdf462088d13	478	MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small" ) );
markrad	0:cdf462088d13	479	return;
markrad	0:cdf462088d13	480	}
markrad	0:cdf462088d13	481
markrad	0:cdf462088d13	482	*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_TRUNCATED_HMAC >> 8 ) & 0xFF );
markrad	0:cdf462088d13	483	*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_TRUNCATED_HMAC ) & 0xFF );
markrad	0:cdf462088d13	484
markrad	0:cdf462088d13	485	*p++ = 0x00;
markrad	0:cdf462088d13	486	*p++ = 0x00;
markrad	0:cdf462088d13	487
markrad	0:cdf462088d13	488	*olen = 4;
markrad	0:cdf462088d13	489	}
markrad	0:cdf462088d13	490	#endif /* MBEDTLS_SSL_TRUNCATED_HMAC */
markrad	0:cdf462088d13	491
markrad	0:cdf462088d13	492	#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
markrad	0:cdf462088d13	493	static void ssl_write_encrypt_then_mac_ext( mbedtls_ssl_context *ssl,
markrad	0:cdf462088d13	494	unsigned char buf, size_t olen )
markrad	0:cdf462088d13	495	{
markrad	0:cdf462088d13	496	unsigned char *p = buf;
markrad	0:cdf462088d13	497	const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_MAX_CONTENT_LEN;
markrad	0:cdf462088d13	498
markrad	0:cdf462088d13	499	*olen = 0;
markrad	0:cdf462088d13	500
markrad	0:cdf462088d13	501	if( ssl->conf->encrypt_then_mac == MBEDTLS_SSL_ETM_DISABLED \|\|
markrad	0:cdf462088d13	502	ssl->conf->max_minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 )
markrad	0:cdf462088d13	503	{
markrad	0:cdf462088d13	504	return;
markrad	0:cdf462088d13	505	}
markrad	0:cdf462088d13	506
markrad	0:cdf462088d13	507	MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, adding encrypt_then_mac "
markrad	0:cdf462088d13	508	"extension" ) );
markrad	0:cdf462088d13	509
markrad	0:cdf462088d13	510	if( end < p \|\| (size_t)( end - p ) < 4 )
markrad	0:cdf462088d13	511	{
markrad	0:cdf462088d13	512	MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small" ) );
markrad	0:cdf462088d13	513	return;
markrad	0:cdf462088d13	514	}
markrad	0:cdf462088d13	515
markrad	0:cdf462088d13	516	*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_ENCRYPT_THEN_MAC >> 8 ) & 0xFF );
markrad	0:cdf462088d13	517	*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_ENCRYPT_THEN_MAC ) & 0xFF );
markrad	0:cdf462088d13	518
markrad	0:cdf462088d13	519	*p++ = 0x00;
markrad	0:cdf462088d13	520	*p++ = 0x00;
markrad	0:cdf462088d13	521
markrad	0:cdf462088d13	522	*olen = 4;
markrad	0:cdf462088d13	523	}
markrad	0:cdf462088d13	524	#endif /* MBEDTLS_SSL_ENCRYPT_THEN_MAC */
markrad	0:cdf462088d13	525
markrad	0:cdf462088d13	526	#if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET)
markrad	0:cdf462088d13	527	static void ssl_write_extended_ms_ext( mbedtls_ssl_context *ssl,
markrad	0:cdf462088d13	528	unsigned char buf, size_t olen )
markrad	0:cdf462088d13	529	{
markrad	0:cdf462088d13	530	unsigned char *p = buf;
markrad	0:cdf462088d13	531	const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_MAX_CONTENT_LEN;
markrad	0:cdf462088d13	532
markrad	0:cdf462088d13	533	*olen = 0;
markrad	0:cdf462088d13	534
markrad	0:cdf462088d13	535	if( ssl->conf->extended_ms == MBEDTLS_SSL_EXTENDED_MS_DISABLED \|\|
markrad	0:cdf462088d13	536	ssl->conf->max_minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 )
markrad	0:cdf462088d13	537	{
markrad	0:cdf462088d13	538	return;
markrad	0:cdf462088d13	539	}
markrad	0:cdf462088d13	540
markrad	0:cdf462088d13	541	MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, adding extended_master_secret "
markrad	0:cdf462088d13	542	"extension" ) );
markrad	0:cdf462088d13	543
markrad	0:cdf462088d13	544	if( end < p \|\| (size_t)( end - p ) < 4 )
markrad	0:cdf462088d13	545	{
markrad	0:cdf462088d13	546	MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small" ) );
markrad	0:cdf462088d13	547	return;
markrad	0:cdf462088d13	548	}
markrad	0:cdf462088d13	549
markrad	0:cdf462088d13	550	*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_EXTENDED_MASTER_SECRET >> 8 ) & 0xFF );
markrad	0:cdf462088d13	551	*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_EXTENDED_MASTER_SECRET ) & 0xFF );
markrad	0:cdf462088d13	552
markrad	0:cdf462088d13	553	*p++ = 0x00;
markrad	0:cdf462088d13	554	*p++ = 0x00;
markrad	0:cdf462088d13	555
markrad	0:cdf462088d13	556	*olen = 4;
markrad	0:cdf462088d13	557	}
markrad	0:cdf462088d13	558	#endif /* MBEDTLS_SSL_EXTENDED_MASTER_SECRET */
markrad	0:cdf462088d13	559
markrad	0:cdf462088d13	560	#if defined(MBEDTLS_SSL_SESSION_TICKETS)
markrad	0:cdf462088d13	561	static void ssl_write_session_ticket_ext( mbedtls_ssl_context *ssl,
markrad	0:cdf462088d13	562	unsigned char buf, size_t olen )
markrad	0:cdf462088d13	563	{
markrad	0:cdf462088d13	564	unsigned char *p = buf;
markrad	0:cdf462088d13	565	const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_MAX_CONTENT_LEN;
markrad	0:cdf462088d13	566	size_t tlen = ssl->session_negotiate->ticket_len;
markrad	0:cdf462088d13	567
markrad	0:cdf462088d13	568	*olen = 0;
markrad	0:cdf462088d13	569
markrad	0:cdf462088d13	570	if( ssl->conf->session_tickets == MBEDTLS_SSL_SESSION_TICKETS_DISABLED )
markrad	0:cdf462088d13	571	{
markrad	0:cdf462088d13	572	return;
markrad	0:cdf462088d13	573	}
markrad	0:cdf462088d13	574
markrad	0:cdf462088d13	575	MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, adding session ticket extension" ) );
markrad	0:cdf462088d13	576
markrad	0:cdf462088d13	577	if( end < p \|\| (size_t)( end - p ) < 4 + tlen )
markrad	0:cdf462088d13	578	{
markrad	0:cdf462088d13	579	MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small" ) );
markrad	0:cdf462088d13	580	return;
markrad	0:cdf462088d13	581	}
markrad	0:cdf462088d13	582
markrad	0:cdf462088d13	583	*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SESSION_TICKET >> 8 ) & 0xFF );
markrad	0:cdf462088d13	584	*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SESSION_TICKET ) & 0xFF );
markrad	0:cdf462088d13	585
markrad	0:cdf462088d13	586	*p++ = (unsigned char)( ( tlen >> 8 ) & 0xFF );
markrad	0:cdf462088d13	587	*p++ = (unsigned char)( ( tlen ) & 0xFF );
markrad	0:cdf462088d13	588
markrad	0:cdf462088d13	589	*olen = 4;
markrad	0:cdf462088d13	590
markrad	0:cdf462088d13	591	if( ssl->session_negotiate->ticket == NULL \|\| tlen == 0 )
markrad	0:cdf462088d13	592	{
markrad	0:cdf462088d13	593	return;
markrad	0:cdf462088d13	594	}
markrad	0:cdf462088d13	595
markrad	0:cdf462088d13	596	MBEDTLS_SSL_DEBUG_MSG( 3, ( "sending session ticket of length %d", tlen ) );
markrad	0:cdf462088d13	597
markrad	0:cdf462088d13	598	memcpy( p, ssl->session_negotiate->ticket, tlen );
markrad	0:cdf462088d13	599
markrad	0:cdf462088d13	600	*olen += tlen;
markrad	0:cdf462088d13	601	}
markrad	0:cdf462088d13	602	#endif /* MBEDTLS_SSL_SESSION_TICKETS */
markrad	0:cdf462088d13	603
markrad	0:cdf462088d13	604	#if defined(MBEDTLS_SSL_ALPN)
markrad	0:cdf462088d13	605	static void ssl_write_alpn_ext( mbedtls_ssl_context *ssl,
markrad	0:cdf462088d13	606	unsigned char buf, size_t olen )
markrad	0:cdf462088d13	607	{
markrad	0:cdf462088d13	608	unsigned char *p = buf;
markrad	0:cdf462088d13	609	const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_MAX_CONTENT_LEN;
markrad	0:cdf462088d13	610	size_t alpnlen = 0;
markrad	0:cdf462088d13	611	const char **cur;
markrad	0:cdf462088d13	612
markrad	0:cdf462088d13	613	*olen = 0;
markrad	0:cdf462088d13	614
markrad	0:cdf462088d13	615	if( ssl->conf->alpn_list == NULL )
markrad	0:cdf462088d13	616	{
markrad	0:cdf462088d13	617	return;
markrad	0:cdf462088d13	618	}
markrad	0:cdf462088d13	619
markrad	0:cdf462088d13	620	MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, adding alpn extension" ) );
markrad	0:cdf462088d13	621
markrad	0:cdf462088d13	622	for( cur = ssl->conf->alpn_list; *cur != NULL; cur++ )
markrad	0:cdf462088d13	623	alpnlen += (unsigned char)( strlen( *cur ) & 0xFF ) + 1;
markrad	0:cdf462088d13	624
markrad	0:cdf462088d13	625	if( end < p \|\| (size_t)( end - p ) < 6 + alpnlen )
markrad	0:cdf462088d13	626	{
markrad	0:cdf462088d13	627	MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small" ) );
markrad	0:cdf462088d13	628	return;
markrad	0:cdf462088d13	629	}
markrad	0:cdf462088d13	630
markrad	0:cdf462088d13	631	*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_ALPN >> 8 ) & 0xFF );
markrad	0:cdf462088d13	632	*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_ALPN ) & 0xFF );
markrad	0:cdf462088d13	633
markrad	0:cdf462088d13	634	/*
markrad	0:cdf462088d13	635	* opaque ProtocolName<1..2^8-1>;
markrad	0:cdf462088d13	636	*
markrad	0:cdf462088d13	637	* struct {
markrad	0:cdf462088d13	638	* ProtocolName protocol_name_list<2..2^16-1>
markrad	0:cdf462088d13	639	* } ProtocolNameList;
markrad	0:cdf462088d13	640	*/
markrad	0:cdf462088d13	641
markrad	0:cdf462088d13	642	/* Skip writing extension and list length for now */
markrad	0:cdf462088d13	643	p += 4;
markrad	0:cdf462088d13	644
markrad	0:cdf462088d13	645	for( cur = ssl->conf->alpn_list; *cur != NULL; cur++ )
markrad	0:cdf462088d13	646	{
markrad	0:cdf462088d13	647	p = (unsigned char)( strlen( cur ) & 0xFF );
markrad	0:cdf462088d13	648	memcpy( p + 1, cur, p );
markrad	0:cdf462088d13	649	p += 1 + *p;
markrad	0:cdf462088d13	650	}
markrad	0:cdf462088d13	651
markrad	0:cdf462088d13	652	*olen = p - buf;
markrad	0:cdf462088d13	653
markrad	0:cdf462088d13	654	/* List length = olen - 2 (ext_type) - 2 (ext_len) - 2 (list_len) */
markrad	0:cdf462088d13	655	buf[4] = (unsigned char)( ( ( *olen - 6 ) >> 8 ) & 0xFF );
markrad	0:cdf462088d13	656	buf[5] = (unsigned char)( ( ( *olen - 6 ) ) & 0xFF );
markrad	0:cdf462088d13	657
markrad	0:cdf462088d13	658	/* Extension length = olen - 2 (ext_type) - 2 (ext_len) */
markrad	0:cdf462088d13	659	buf[2] = (unsigned char)( ( ( *olen - 4 ) >> 8 ) & 0xFF );
markrad	0:cdf462088d13	660	buf[3] = (unsigned char)( ( ( *olen - 4 ) ) & 0xFF );
markrad	0:cdf462088d13	661	}
markrad	0:cdf462088d13	662	#endif /* MBEDTLS_SSL_ALPN */
markrad	0:cdf462088d13	663
markrad	0:cdf462088d13	664	/*
markrad	0:cdf462088d13	665	* Generate random bytes for ClientHello
markrad	0:cdf462088d13	666	*/
markrad	0:cdf462088d13	667	static int ssl_generate_random( mbedtls_ssl_context *ssl )
markrad	0:cdf462088d13	668	{
markrad	0:cdf462088d13	669	int ret;
markrad	0:cdf462088d13	670	unsigned char *p = ssl->handshake->randbytes;
markrad	0:cdf462088d13	671	#if defined(MBEDTLS_HAVE_TIME)
markrad	0:cdf462088d13	672	mbedtls_time_t t;
markrad	0:cdf462088d13	673	#endif
markrad	0:cdf462088d13	674
markrad	0:cdf462088d13	675	/*
markrad	0:cdf462088d13	676	* When responding to a verify request, MUST reuse random (RFC 6347 4.2.1)
markrad	0:cdf462088d13	677	*/
markrad	0:cdf462088d13	678	#if defined(MBEDTLS_SSL_PROTO_DTLS)
markrad	0:cdf462088d13	679	if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
markrad	0:cdf462088d13	680	ssl->handshake->verify_cookie != NULL )
markrad	0:cdf462088d13	681	{
markrad	0:cdf462088d13	682	return( 0 );
markrad	0:cdf462088d13	683	}
markrad	0:cdf462088d13	684	#endif
markrad	0:cdf462088d13	685
markrad	0:cdf462088d13	686	#if defined(MBEDTLS_HAVE_TIME)
markrad	0:cdf462088d13	687	t = mbedtls_time( NULL );
markrad	0:cdf462088d13	688	*p++ = (unsigned char)( t >> 24 );
markrad	0:cdf462088d13	689	*p++ = (unsigned char)( t >> 16 );
markrad	0:cdf462088d13	690	*p++ = (unsigned char)( t >> 8 );
markrad	0:cdf462088d13	691	*p++ = (unsigned char)( t );
markrad	0:cdf462088d13	692
markrad	0:cdf462088d13	693	MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, current time: %lu", t ) );
markrad	0:cdf462088d13	694	#else
markrad	0:cdf462088d13	695	if( ( ret = ssl->conf->f_rng( ssl->conf->p_rng, p, 4 ) ) != 0 )
markrad	0:cdf462088d13	696	return( ret );
markrad	0:cdf462088d13	697
markrad	0:cdf462088d13	698	p += 4;
markrad	0:cdf462088d13	699	#endif /* MBEDTLS_HAVE_TIME */
markrad	0:cdf462088d13	700
markrad	0:cdf462088d13	701	if( ( ret = ssl->conf->f_rng( ssl->conf->p_rng, p, 28 ) ) != 0 )
markrad	0:cdf462088d13	702	return( ret );
markrad	0:cdf462088d13	703
markrad	0:cdf462088d13	704	return( 0 );
markrad	0:cdf462088d13	705	}
markrad	0:cdf462088d13	706
markrad	0:cdf462088d13	707	static int ssl_write_client_hello( mbedtls_ssl_context *ssl )
markrad	0:cdf462088d13	708	{
markrad	0:cdf462088d13	709	int ret;
markrad	0:cdf462088d13	710	size_t i, n, olen, ext_len = 0;
markrad	0:cdf462088d13	711	unsigned char *buf;
markrad	0:cdf462088d13	712	unsigned char p, q;
markrad	0:cdf462088d13	713	unsigned char offer_compress;
markrad	0:cdf462088d13	714	const int *ciphersuites;
markrad	0:cdf462088d13	715	const mbedtls_ssl_ciphersuite_t *ciphersuite_info;
markrad	0:cdf462088d13	716
markrad	0:cdf462088d13	717	MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write client hello" ) );
markrad	0:cdf462088d13	718
markrad	0:cdf462088d13	719	if( ssl->conf->f_rng == NULL )
markrad	0:cdf462088d13	720	{
markrad	0:cdf462088d13	721	MBEDTLS_SSL_DEBUG_MSG( 1, ( "no RNG provided") );
markrad	0:cdf462088d13	722	return( MBEDTLS_ERR_SSL_NO_RNG );
markrad	0:cdf462088d13	723	}
markrad	0:cdf462088d13	724
markrad	0:cdf462088d13	725	#if defined(MBEDTLS_SSL_RENEGOTIATION)
markrad	0:cdf462088d13	726	if( ssl->renego_status == MBEDTLS_SSL_INITIAL_HANDSHAKE )
markrad	0:cdf462088d13	727	#endif
markrad	0:cdf462088d13	728	{
markrad	0:cdf462088d13	729	ssl->major_ver = ssl->conf->min_major_ver;
markrad	0:cdf462088d13	730	ssl->minor_ver = ssl->conf->min_minor_ver;
markrad	0:cdf462088d13	731	}
markrad	0:cdf462088d13	732
markrad	0:cdf462088d13	733	if( ssl->conf->max_major_ver == 0 )
markrad	0:cdf462088d13	734	{
markrad	0:cdf462088d13	735	MBEDTLS_SSL_DEBUG_MSG( 1, ( "configured max major version is invalid, "
markrad	0:cdf462088d13	736	"consider using mbedtls_ssl_config_defaults()" ) );
markrad	0:cdf462088d13	737	return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
markrad	0:cdf462088d13	738	}
markrad	0:cdf462088d13	739
markrad	0:cdf462088d13	740	/*
markrad	0:cdf462088d13	741	* 0 . 0 handshake type
markrad	0:cdf462088d13	742	* 1 . 3 handshake length
markrad	0:cdf462088d13	743	* 4 . 5 highest version supported
markrad	0:cdf462088d13	744	* 6 . 9 current UNIX time
markrad	0:cdf462088d13	745	* 10 . 37 random bytes
markrad	0:cdf462088d13	746	*/
markrad	0:cdf462088d13	747	buf = ssl->out_msg;
markrad	0:cdf462088d13	748	p = buf + 4;
markrad	0:cdf462088d13	749
markrad	0:cdf462088d13	750	mbedtls_ssl_write_version( ssl->conf->max_major_ver, ssl->conf->max_minor_ver,
markrad	0:cdf462088d13	751	ssl->conf->transport, p );
markrad	0:cdf462088d13	752	p += 2;
markrad	0:cdf462088d13	753
markrad	0:cdf462088d13	754	MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, max version: [%d:%d]",
markrad	0:cdf462088d13	755	buf[4], buf[5] ) );
markrad	0:cdf462088d13	756
markrad	0:cdf462088d13	757	if( ( ret = ssl_generate_random( ssl ) ) != 0 )
markrad	0:cdf462088d13	758	{
markrad	0:cdf462088d13	759	MBEDTLS_SSL_DEBUG_RET( 1, "ssl_generate_random", ret );
markrad	0:cdf462088d13	760	return( ret );
markrad	0:cdf462088d13	761	}
markrad	0:cdf462088d13	762
markrad	0:cdf462088d13	763	memcpy( p, ssl->handshake->randbytes, 32 );
markrad	0:cdf462088d13	764	MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, random bytes", p, 32 );
markrad	0:cdf462088d13	765	p += 32;
markrad	0:cdf462088d13	766
markrad	0:cdf462088d13	767	/*
markrad	0:cdf462088d13	768	* 38 . 38 session id length
markrad	0:cdf462088d13	769	* 39 . 39+n session id
markrad	0:cdf462088d13	770	* 39+n . 39+n DTLS only: cookie length (1 byte)
markrad	0:cdf462088d13	771	* 40+n . .. DTSL only: cookie
markrad	0:cdf462088d13	772	* .. . .. ciphersuitelist length (2 bytes)
markrad	0:cdf462088d13	773	* .. . .. ciphersuitelist
markrad	0:cdf462088d13	774	* .. . .. compression methods length (1 byte)
markrad	0:cdf462088d13	775	* .. . .. compression methods
markrad	0:cdf462088d13	776	* .. . .. extensions length (2 bytes)
markrad	0:cdf462088d13	777	* .. . .. extensions
markrad	0:cdf462088d13	778	*/
markrad	0:cdf462088d13	779	n = ssl->session_negotiate->id_len;
markrad	0:cdf462088d13	780
markrad	0:cdf462088d13	781	if( n < 16 \|\| n > 32 \|\|
markrad	0:cdf462088d13	782	#if defined(MBEDTLS_SSL_RENEGOTIATION)
markrad	0:cdf462088d13	783	ssl->renego_status != MBEDTLS_SSL_INITIAL_HANDSHAKE \|\|
markrad	0:cdf462088d13	784	#endif
markrad	0:cdf462088d13	785	ssl->handshake->resume == 0 )
markrad	0:cdf462088d13	786	{
markrad	0:cdf462088d13	787	n = 0;
markrad	0:cdf462088d13	788	}
markrad	0:cdf462088d13	789
markrad	0:cdf462088d13	790	#if defined(MBEDTLS_SSL_SESSION_TICKETS)
markrad	0:cdf462088d13	791	/*
markrad	0:cdf462088d13	792	* RFC 5077 section 3.4: "When presenting a ticket, the client MAY
markrad	0:cdf462088d13	793	* generate and include a Session ID in the TLS ClientHello."
markrad	0:cdf462088d13	794	*/
markrad	0:cdf462088d13	795	#if defined(MBEDTLS_SSL_RENEGOTIATION)
markrad	0:cdf462088d13	796	if( ssl->renego_status == MBEDTLS_SSL_INITIAL_HANDSHAKE )
markrad	0:cdf462088d13	797	#endif
markrad	0:cdf462088d13	798	{
markrad	0:cdf462088d13	799	if( ssl->session_negotiate->ticket != NULL &&
markrad	0:cdf462088d13	800	ssl->session_negotiate->ticket_len != 0 )
markrad	0:cdf462088d13	801	{
markrad	0:cdf462088d13	802	ret = ssl->conf->f_rng( ssl->conf->p_rng, ssl->session_negotiate->id, 32 );
markrad	0:cdf462088d13	803
markrad	0:cdf462088d13	804	if( ret != 0 )
markrad	0:cdf462088d13	805	return( ret );
markrad	0:cdf462088d13	806
markrad	0:cdf462088d13	807	ssl->session_negotiate->id_len = n = 32;
markrad	0:cdf462088d13	808	}
markrad	0:cdf462088d13	809	}
markrad	0:cdf462088d13	810	#endif /* MBEDTLS_SSL_SESSION_TICKETS */
markrad	0:cdf462088d13	811
markrad	0:cdf462088d13	812	*p++ = (unsigned char) n;
markrad	0:cdf462088d13	813
markrad	0:cdf462088d13	814	for( i = 0; i < n; i++ )
markrad	0:cdf462088d13	815	*p++ = ssl->session_negotiate->id[i];
markrad	0:cdf462088d13	816
markrad	0:cdf462088d13	817	MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, session id len.: %d", n ) );
markrad	0:cdf462088d13	818	MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, session id", buf + 39, n );
markrad	0:cdf462088d13	819
markrad	0:cdf462088d13	820	/*
markrad	0:cdf462088d13	821	* DTLS cookie
markrad	0:cdf462088d13	822	*/
markrad	0:cdf462088d13	823	#if defined(MBEDTLS_SSL_PROTO_DTLS)
markrad	0:cdf462088d13	824	if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
markrad	0:cdf462088d13	825	{
markrad	0:cdf462088d13	826	if( ssl->handshake->verify_cookie == NULL )
markrad	0:cdf462088d13	827	{
markrad	0:cdf462088d13	828	MBEDTLS_SSL_DEBUG_MSG( 3, ( "no verify cookie to send" ) );
markrad	0:cdf462088d13	829	*p++ = 0;
markrad	0:cdf462088d13	830	}
markrad	0:cdf462088d13	831	else
markrad	0:cdf462088d13	832	{
markrad	0:cdf462088d13	833	MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, cookie",
markrad	0:cdf462088d13	834	ssl->handshake->verify_cookie,
markrad	0:cdf462088d13	835	ssl->handshake->verify_cookie_len );
markrad	0:cdf462088d13	836
markrad	0:cdf462088d13	837	*p++ = ssl->handshake->verify_cookie_len;
markrad	0:cdf462088d13	838	memcpy( p, ssl->handshake->verify_cookie,
markrad	0:cdf462088d13	839	ssl->handshake->verify_cookie_len );
markrad	0:cdf462088d13	840	p += ssl->handshake->verify_cookie_len;
markrad	0:cdf462088d13	841	}
markrad	0:cdf462088d13	842	}
markrad	0:cdf462088d13	843	#endif
markrad	0:cdf462088d13	844
markrad	0:cdf462088d13	845	/*
markrad	0:cdf462088d13	846	* Ciphersuite list
markrad	0:cdf462088d13	847	*/
markrad	0:cdf462088d13	848	ciphersuites = ssl->conf->ciphersuite_list[ssl->minor_ver];
markrad	0:cdf462088d13	849
markrad	0:cdf462088d13	850	/* Skip writing ciphersuite length for now */
markrad	0:cdf462088d13	851	n = 0;
markrad	0:cdf462088d13	852	q = p;
markrad	0:cdf462088d13	853	p += 2;
markrad	0:cdf462088d13	854
markrad	0:cdf462088d13	855	for( i = 0; ciphersuites[i] != 0; i++ )
markrad	0:cdf462088d13	856	{
markrad	0:cdf462088d13	857	ciphersuite_info = mbedtls_ssl_ciphersuite_from_id( ciphersuites[i] );
markrad	0:cdf462088d13	858
markrad	0:cdf462088d13	859	if( ciphersuite_info == NULL )
markrad	0:cdf462088d13	860	continue;
markrad	0:cdf462088d13	861
markrad	0:cdf462088d13	862	if( ciphersuite_info->min_minor_ver > ssl->conf->max_minor_ver \|\|
markrad	0:cdf462088d13	863	ciphersuite_info->max_minor_ver < ssl->conf->min_minor_ver )
markrad	0:cdf462088d13	864	continue;
markrad	0:cdf462088d13	865
markrad	0:cdf462088d13	866	#if defined(MBEDTLS_SSL_PROTO_DTLS)
markrad	0:cdf462088d13	867	if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
markrad	0:cdf462088d13	868	( ciphersuite_info->flags & MBEDTLS_CIPHERSUITE_NODTLS ) )
markrad	0:cdf462088d13	869	continue;
markrad	0:cdf462088d13	870	#endif
markrad	0:cdf462088d13	871
markrad	0:cdf462088d13	872	#if defined(MBEDTLS_ARC4_C)
markrad	0:cdf462088d13	873	if( ssl->conf->arc4_disabled == MBEDTLS_SSL_ARC4_DISABLED &&
markrad	0:cdf462088d13	874	ciphersuite_info->cipher == MBEDTLS_CIPHER_ARC4_128 )
markrad	0:cdf462088d13	875	continue;
markrad	0:cdf462088d13	876	#endif
markrad	0:cdf462088d13	877
markrad	0:cdf462088d13	878	#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
markrad	0:cdf462088d13	879	if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECJPAKE &&
markrad	0:cdf462088d13	880	mbedtls_ecjpake_check( &ssl->handshake->ecjpake_ctx ) != 0 )
markrad	0:cdf462088d13	881	continue;
markrad	0:cdf462088d13	882	#endif
markrad	0:cdf462088d13	883
markrad	0:cdf462088d13	884	MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, add ciphersuite: %04x",
markrad	0:cdf462088d13	885	ciphersuites[i] ) );
markrad	0:cdf462088d13	886
markrad	0:cdf462088d13	887	n++;
markrad	0:cdf462088d13	888	*p++ = (unsigned char)( ciphersuites[i] >> 8 );
markrad	0:cdf462088d13	889	*p++ = (unsigned char)( ciphersuites[i] );
markrad	0:cdf462088d13	890	}
markrad	0:cdf462088d13	891
markrad	0:cdf462088d13	892	/*
markrad	0:cdf462088d13	893	* Add TLS_EMPTY_RENEGOTIATION_INFO_SCSV
markrad	0:cdf462088d13	894	*/
markrad	0:cdf462088d13	895	#if defined(MBEDTLS_SSL_RENEGOTIATION)
markrad	0:cdf462088d13	896	if( ssl->renego_status == MBEDTLS_SSL_INITIAL_HANDSHAKE )
markrad	0:cdf462088d13	897	#endif
markrad	0:cdf462088d13	898	{
markrad	0:cdf462088d13	899	*p++ = (unsigned char)( MBEDTLS_SSL_EMPTY_RENEGOTIATION_INFO >> 8 );
markrad	0:cdf462088d13	900	*p++ = (unsigned char)( MBEDTLS_SSL_EMPTY_RENEGOTIATION_INFO );
markrad	0:cdf462088d13	901	n++;
markrad	0:cdf462088d13	902	}
markrad	0:cdf462088d13	903
markrad	0:cdf462088d13	904	/* Some versions of OpenSSL don't handle it correctly if not at end */
markrad	0:cdf462088d13	905	#if defined(MBEDTLS_SSL_FALLBACK_SCSV)
markrad	0:cdf462088d13	906	if( ssl->conf->fallback == MBEDTLS_SSL_IS_FALLBACK )
markrad	0:cdf462088d13	907	{
markrad	0:cdf462088d13	908	MBEDTLS_SSL_DEBUG_MSG( 3, ( "adding FALLBACK_SCSV" ) );
markrad	0:cdf462088d13	909	*p++ = (unsigned char)( MBEDTLS_SSL_FALLBACK_SCSV_VALUE >> 8 );
markrad	0:cdf462088d13	910	*p++ = (unsigned char)( MBEDTLS_SSL_FALLBACK_SCSV_VALUE );
markrad	0:cdf462088d13	911	n++;
markrad	0:cdf462088d13	912	}
markrad	0:cdf462088d13	913	#endif
markrad	0:cdf462088d13	914
markrad	0:cdf462088d13	915	*q++ = (unsigned char)( n >> 7 );
markrad	0:cdf462088d13	916	*q++ = (unsigned char)( n << 1 );
markrad	0:cdf462088d13	917
markrad	0:cdf462088d13	918	MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, got %d ciphersuites", n ) );
markrad	0:cdf462088d13	919
markrad	0:cdf462088d13	920	#if defined(MBEDTLS_ZLIB_SUPPORT)
markrad	0:cdf462088d13	921	offer_compress = 1;
markrad	0:cdf462088d13	922	#else
markrad	0:cdf462088d13	923	offer_compress = 0;
markrad	0:cdf462088d13	924	#endif
markrad	0:cdf462088d13	925
markrad	0:cdf462088d13	926	/*
markrad	0:cdf462088d13	927	* We don't support compression with DTLS right now: is many records come
markrad	0:cdf462088d13	928	* in the same datagram, uncompressing one could overwrite the next one.
markrad	0:cdf462088d13	929	* We don't want to add complexity for handling that case unless there is
markrad	0:cdf462088d13	930	* an actual need for it.
markrad	0:cdf462088d13	931	*/
markrad	0:cdf462088d13	932	#if defined(MBEDTLS_SSL_PROTO_DTLS)
markrad	0:cdf462088d13	933	if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
markrad	0:cdf462088d13	934	offer_compress = 0;
markrad	0:cdf462088d13	935	#endif
markrad	0:cdf462088d13	936
markrad	0:cdf462088d13	937	if( offer_compress )
markrad	0:cdf462088d13	938	{
markrad	0:cdf462088d13	939	MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, compress len.: %d", 2 ) );
markrad	0:cdf462088d13	940	MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, compress alg.: %d %d",
markrad	0:cdf462088d13	941	MBEDTLS_SSL_COMPRESS_DEFLATE, MBEDTLS_SSL_COMPRESS_NULL ) );
markrad	0:cdf462088d13	942
markrad	0:cdf462088d13	943	*p++ = 2;
markrad	0:cdf462088d13	944	*p++ = MBEDTLS_SSL_COMPRESS_DEFLATE;
markrad	0:cdf462088d13	945	*p++ = MBEDTLS_SSL_COMPRESS_NULL;
markrad	0:cdf462088d13	946	}
markrad	0:cdf462088d13	947	else
markrad	0:cdf462088d13	948	{
markrad	0:cdf462088d13	949	MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, compress len.: %d", 1 ) );
markrad	0:cdf462088d13	950	MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, compress alg.: %d",
markrad	0:cdf462088d13	951	MBEDTLS_SSL_COMPRESS_NULL ) );
markrad	0:cdf462088d13	952
markrad	0:cdf462088d13	953	*p++ = 1;
markrad	0:cdf462088d13	954	*p++ = MBEDTLS_SSL_COMPRESS_NULL;
markrad	0:cdf462088d13	955	}
markrad	0:cdf462088d13	956
markrad	0:cdf462088d13	957	// First write extensions, then the total length
markrad	0:cdf462088d13	958	//
markrad	0:cdf462088d13	959	#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
markrad	0:cdf462088d13	960	ssl_write_hostname_ext( ssl, p + 2 + ext_len, &olen );
markrad	0:cdf462088d13	961	ext_len += olen;
markrad	0:cdf462088d13	962	#endif
markrad	0:cdf462088d13	963
markrad	0:cdf462088d13	964	#if defined(MBEDTLS_SSL_RENEGOTIATION)
markrad	0:cdf462088d13	965	ssl_write_renegotiation_ext( ssl, p + 2 + ext_len, &olen );
markrad	0:cdf462088d13	966	ext_len += olen;
markrad	0:cdf462088d13	967	#endif
markrad	0:cdf462088d13	968
markrad	0:cdf462088d13	969	#if defined(MBEDTLS_SSL_PROTO_TLS1_2) && \
markrad	0:cdf462088d13	970	defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED)
markrad	0:cdf462088d13	971	ssl_write_signature_algorithms_ext( ssl, p + 2 + ext_len, &olen );
markrad	0:cdf462088d13	972	ext_len += olen;
markrad	0:cdf462088d13	973	#endif
markrad	0:cdf462088d13	974
markrad	0:cdf462088d13	975	#if defined(MBEDTLS_ECDH_C) \|\| defined(MBEDTLS_ECDSA_C) \|\| \
markrad	0:cdf462088d13	976	defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
markrad	0:cdf462088d13	977	ssl_write_supported_elliptic_curves_ext( ssl, p + 2 + ext_len, &olen );
markrad	0:cdf462088d13	978	ext_len += olen;
markrad	0:cdf462088d13	979
markrad	0:cdf462088d13	980	ssl_write_supported_point_formats_ext( ssl, p + 2 + ext_len, &olen );
markrad	0:cdf462088d13	981	ext_len += olen;
markrad	0:cdf462088d13	982	#endif
markrad	0:cdf462088d13	983
markrad	0:cdf462088d13	984	#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
markrad	0:cdf462088d13	985	ssl_write_ecjpake_kkpp_ext( ssl, p + 2 + ext_len, &olen );
markrad	0:cdf462088d13	986	ext_len += olen;
markrad	0:cdf462088d13	987	#endif
markrad	0:cdf462088d13	988
markrad	0:cdf462088d13	989	#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
markrad	0:cdf462088d13	990	ssl_write_max_fragment_length_ext( ssl, p + 2 + ext_len, &olen );
markrad	0:cdf462088d13	991	ext_len += olen;
markrad	0:cdf462088d13	992	#endif
markrad	0:cdf462088d13	993
markrad	0:cdf462088d13	994	#if defined(MBEDTLS_SSL_TRUNCATED_HMAC)
markrad	0:cdf462088d13	995	ssl_write_truncated_hmac_ext( ssl, p + 2 + ext_len, &olen );
markrad	0:cdf462088d13	996	ext_len += olen;
markrad	0:cdf462088d13	997	#endif
markrad	0:cdf462088d13	998
markrad	0:cdf462088d13	999	#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
markrad	0:cdf462088d13	1000	ssl_write_encrypt_then_mac_ext( ssl, p + 2 + ext_len, &olen );
markrad	0:cdf462088d13	1001	ext_len += olen;
markrad	0:cdf462088d13	1002	#endif
markrad	0:cdf462088d13	1003
markrad	0:cdf462088d13	1004	#if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET)
markrad	0:cdf462088d13	1005	ssl_write_extended_ms_ext( ssl, p + 2 + ext_len, &olen );
markrad	0:cdf462088d13	1006	ext_len += olen;
markrad	0:cdf462088d13	1007	#endif
markrad	0:cdf462088d13	1008
markrad	0:cdf462088d13	1009	#if defined(MBEDTLS_SSL_ALPN)
markrad	0:cdf462088d13	1010	ssl_write_alpn_ext( ssl, p + 2 + ext_len, &olen );
markrad	0:cdf462088d13	1011	ext_len += olen;
markrad	0:cdf462088d13	1012	#endif
markrad	0:cdf462088d13	1013
markrad	0:cdf462088d13	1014	#if defined(MBEDTLS_SSL_SESSION_TICKETS)
markrad	0:cdf462088d13	1015	ssl_write_session_ticket_ext( ssl, p + 2 + ext_len, &olen );
markrad	0:cdf462088d13	1016	ext_len += olen;
markrad	0:cdf462088d13	1017	#endif
markrad	0:cdf462088d13	1018
markrad	0:cdf462088d13	1019	/* olen unused if all extensions are disabled */
markrad	0:cdf462088d13	1020	((void) olen);
markrad	0:cdf462088d13	1021
markrad	0:cdf462088d13	1022	MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, total extension length: %d",
markrad	0:cdf462088d13	1023	ext_len ) );
markrad	0:cdf462088d13	1024
markrad	0:cdf462088d13	1025	if( ext_len > 0 )
markrad	0:cdf462088d13	1026	{
markrad	0:cdf462088d13	1027	*p++ = (unsigned char)( ( ext_len >> 8 ) & 0xFF );
markrad	0:cdf462088d13	1028	*p++ = (unsigned char)( ( ext_len ) & 0xFF );
markrad	0:cdf462088d13	1029	p += ext_len;
markrad	0:cdf462088d13	1030	}
markrad	0:cdf462088d13	1031
markrad	0:cdf462088d13	1032	ssl->out_msglen = p - buf;
markrad	0:cdf462088d13	1033	ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE;
markrad	0:cdf462088d13	1034	ssl->out_msg[0] = MBEDTLS_SSL_HS_CLIENT_HELLO;
markrad	0:cdf462088d13	1035
markrad	0:cdf462088d13	1036	ssl->state++;
markrad	0:cdf462088d13	1037
markrad	0:cdf462088d13	1038	#if defined(MBEDTLS_SSL_PROTO_DTLS)
markrad	0:cdf462088d13	1039	if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
markrad	0:cdf462088d13	1040	mbedtls_ssl_send_flight_completed( ssl );
markrad	0:cdf462088d13	1041	#endif
markrad	0:cdf462088d13	1042
markrad	0:cdf462088d13	1043	if( ( ret = mbedtls_ssl_write_record( ssl ) ) != 0 )
markrad	0:cdf462088d13	1044	{
markrad	0:cdf462088d13	1045	MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_record", ret );
markrad	0:cdf462088d13	1046	return( ret );
markrad	0:cdf462088d13	1047	}
markrad	0:cdf462088d13	1048
markrad	0:cdf462088d13	1049	MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write client hello" ) );
markrad	0:cdf462088d13	1050
markrad	0:cdf462088d13	1051	return( 0 );
markrad	0:cdf462088d13	1052	}
markrad	0:cdf462088d13	1053
markrad	0:cdf462088d13	1054	static int ssl_parse_renegotiation_info( mbedtls_ssl_context *ssl,
markrad	0:cdf462088d13	1055	const unsigned char *buf,
markrad	0:cdf462088d13	1056	size_t len )
markrad	0:cdf462088d13	1057	{
markrad	0:cdf462088d13	1058	int ret;
markrad	0:cdf462088d13	1059
markrad	0:cdf462088d13	1060	#if defined(MBEDTLS_SSL_RENEGOTIATION)
markrad	0:cdf462088d13	1061	if( ssl->renego_status != MBEDTLS_SSL_INITIAL_HANDSHAKE )
markrad	0:cdf462088d13	1062	{
markrad	0:cdf462088d13	1063	/* Check verify-data in constant-time. The length OTOH is no secret */
markrad	0:cdf462088d13	1064	if( len != 1 + ssl->verify_data_len * 2 \|\|
markrad	0:cdf462088d13	1065	buf[0] != ssl->verify_data_len * 2 \|\|
markrad	0:cdf462088d13	1066	mbedtls_ssl_safer_memcmp( buf + 1,
markrad	0:cdf462088d13	1067	ssl->own_verify_data, ssl->verify_data_len ) != 0 \|\|
markrad	0:cdf462088d13	1068	mbedtls_ssl_safer_memcmp( buf + 1 + ssl->verify_data_len,
markrad	0:cdf462088d13	1069	ssl->peer_verify_data, ssl->verify_data_len ) != 0 )
markrad	0:cdf462088d13	1070	{
markrad	0:cdf462088d13	1071	MBEDTLS_SSL_DEBUG_MSG( 1, ( "non-matching renegotiation info" ) );
markrad	0:cdf462088d13	1072
markrad	0:cdf462088d13	1073	if( ( ret = mbedtls_ssl_send_fatal_handshake_failure( ssl ) ) != 0 )
markrad	0:cdf462088d13	1074	return( ret );
markrad	0:cdf462088d13	1075
markrad	0:cdf462088d13	1076	return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
markrad	0:cdf462088d13	1077	}
markrad	0:cdf462088d13	1078	}
markrad	0:cdf462088d13	1079	else
markrad	0:cdf462088d13	1080	#endif /* MBEDTLS_SSL_RENEGOTIATION */
markrad	0:cdf462088d13	1081	{
markrad	0:cdf462088d13	1082	if( len != 1 \|\| buf[0] != 0x00 )
markrad	0:cdf462088d13	1083	{
markrad	0:cdf462088d13	1084	MBEDTLS_SSL_DEBUG_MSG( 1, ( "non-zero length renegotiation info" ) );
markrad	0:cdf462088d13	1085
markrad	0:cdf462088d13	1086	if( ( ret = mbedtls_ssl_send_fatal_handshake_failure( ssl ) ) != 0 )
markrad	0:cdf462088d13	1087	return( ret );
markrad	0:cdf462088d13	1088
markrad	0:cdf462088d13	1089	return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
markrad	0:cdf462088d13	1090	}
markrad	0:cdf462088d13	1091
markrad	0:cdf462088d13	1092	ssl->secure_renegotiation = MBEDTLS_SSL_SECURE_RENEGOTIATION;
markrad	0:cdf462088d13	1093	}
markrad	0:cdf462088d13	1094
markrad	0:cdf462088d13	1095	return( 0 );
markrad	0:cdf462088d13	1096	}
markrad	0:cdf462088d13	1097
markrad	0:cdf462088d13	1098	#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
markrad	0:cdf462088d13	1099	static int ssl_parse_max_fragment_length_ext( mbedtls_ssl_context *ssl,
markrad	0:cdf462088d13	1100	const unsigned char *buf,
markrad	0:cdf462088d13	1101	size_t len )
markrad	0:cdf462088d13	1102	{
markrad	0:cdf462088d13	1103	/*
markrad	0:cdf462088d13	1104	* server should use the extension only if we did,
markrad	0:cdf462088d13	1105	* and if so the server's value should match ours (and len is always 1)
markrad	0:cdf462088d13	1106	*/
markrad	0:cdf462088d13	1107	if( ssl->conf->mfl_code == MBEDTLS_SSL_MAX_FRAG_LEN_NONE \|\|
markrad	0:cdf462088d13	1108	len != 1 \|\|
markrad	0:cdf462088d13	1109	buf[0] != ssl->conf->mfl_code )
markrad	0:cdf462088d13	1110	{
markrad	0:cdf462088d13	1111	return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
markrad	0:cdf462088d13	1112	}
markrad	0:cdf462088d13	1113
markrad	0:cdf462088d13	1114	return( 0 );
markrad	0:cdf462088d13	1115	}
markrad	0:cdf462088d13	1116	#endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */
markrad	0:cdf462088d13	1117
markrad	0:cdf462088d13	1118	#if defined(MBEDTLS_SSL_TRUNCATED_HMAC)
markrad	0:cdf462088d13	1119	static int ssl_parse_truncated_hmac_ext( mbedtls_ssl_context *ssl,
markrad	0:cdf462088d13	1120	const unsigned char *buf,
markrad	0:cdf462088d13	1121	size_t len )
markrad	0:cdf462088d13	1122	{
markrad	0:cdf462088d13	1123	if( ssl->conf->trunc_hmac == MBEDTLS_SSL_TRUNC_HMAC_DISABLED \|\|
markrad	0:cdf462088d13	1124	len != 0 )
markrad	0:cdf462088d13	1125	{
markrad	0:cdf462088d13	1126	return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
markrad	0:cdf462088d13	1127	}
markrad	0:cdf462088d13	1128
markrad	0:cdf462088d13	1129	((void) buf);
markrad	0:cdf462088d13	1130
markrad	0:cdf462088d13	1131	ssl->session_negotiate->trunc_hmac = MBEDTLS_SSL_TRUNC_HMAC_ENABLED;
markrad	0:cdf462088d13	1132
markrad	0:cdf462088d13	1133	return( 0 );
markrad	0:cdf462088d13	1134	}
markrad	0:cdf462088d13	1135	#endif /* MBEDTLS_SSL_TRUNCATED_HMAC */
markrad	0:cdf462088d13	1136
markrad	0:cdf462088d13	1137	#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
markrad	0:cdf462088d13	1138	static int ssl_parse_encrypt_then_mac_ext( mbedtls_ssl_context *ssl,
markrad	0:cdf462088d13	1139	const unsigned char *buf,
markrad	0:cdf462088d13	1140	size_t len )
markrad	0:cdf462088d13	1141	{
markrad	0:cdf462088d13	1142	if( ssl->conf->encrypt_then_mac == MBEDTLS_SSL_ETM_DISABLED \|\|
markrad	0:cdf462088d13	1143	ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 \|\|
markrad	0:cdf462088d13	1144	len != 0 )
markrad	0:cdf462088d13	1145	{
markrad	0:cdf462088d13	1146	return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
markrad	0:cdf462088d13	1147	}
markrad	0:cdf462088d13	1148
markrad	0:cdf462088d13	1149	((void) buf);
markrad	0:cdf462088d13	1150
markrad	0:cdf462088d13	1151	ssl->session_negotiate->encrypt_then_mac = MBEDTLS_SSL_ETM_ENABLED;
markrad	0:cdf462088d13	1152
markrad	0:cdf462088d13	1153	return( 0 );
markrad	0:cdf462088d13	1154	}
markrad	0:cdf462088d13	1155	#endif /* MBEDTLS_SSL_ENCRYPT_THEN_MAC */
markrad	0:cdf462088d13	1156
markrad	0:cdf462088d13	1157	#if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET)
markrad	0:cdf462088d13	1158	static int ssl_parse_extended_ms_ext( mbedtls_ssl_context *ssl,
markrad	0:cdf462088d13	1159	const unsigned char *buf,
markrad	0:cdf462088d13	1160	size_t len )
markrad	0:cdf462088d13	1161	{
markrad	0:cdf462088d13	1162	if( ssl->conf->extended_ms == MBEDTLS_SSL_EXTENDED_MS_DISABLED \|\|
markrad	0:cdf462088d13	1163	ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 \|\|
markrad	0:cdf462088d13	1164	len != 0 )
markrad	0:cdf462088d13	1165	{
markrad	0:cdf462088d13	1166	return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
markrad	0:cdf462088d13	1167	}
markrad	0:cdf462088d13	1168
markrad	0:cdf462088d13	1169	((void) buf);
markrad	0:cdf462088d13	1170
markrad	0:cdf462088d13	1171	ssl->handshake->extended_ms = MBEDTLS_SSL_EXTENDED_MS_ENABLED;
markrad	0:cdf462088d13	1172
markrad	0:cdf462088d13	1173	return( 0 );
markrad	0:cdf462088d13	1174	}
markrad	0:cdf462088d13	1175	#endif /* MBEDTLS_SSL_EXTENDED_MASTER_SECRET */
markrad	0:cdf462088d13	1176
markrad	0:cdf462088d13	1177	#if defined(MBEDTLS_SSL_SESSION_TICKETS)
markrad	0:cdf462088d13	1178	static int ssl_parse_session_ticket_ext( mbedtls_ssl_context *ssl,
markrad	0:cdf462088d13	1179	const unsigned char *buf,
markrad	0:cdf462088d13	1180	size_t len )
markrad	0:cdf462088d13	1181	{
markrad	0:cdf462088d13	1182	if( ssl->conf->session_tickets == MBEDTLS_SSL_SESSION_TICKETS_DISABLED \|\|
markrad	0:cdf462088d13	1183	len != 0 )
markrad	0:cdf462088d13	1184	{
markrad	0:cdf462088d13	1185	return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
markrad	0:cdf462088d13	1186	}
markrad	0:cdf462088d13	1187
markrad	0:cdf462088d13	1188	((void) buf);
markrad	0:cdf462088d13	1189
markrad	0:cdf462088d13	1190	ssl->handshake->new_session_ticket = 1;
markrad	0:cdf462088d13	1191
markrad	0:cdf462088d13	1192	return( 0 );
markrad	0:cdf462088d13	1193	}
markrad	0:cdf462088d13	1194	#endif /* MBEDTLS_SSL_SESSION_TICKETS */
markrad	0:cdf462088d13	1195
markrad	0:cdf462088d13	1196	#if defined(MBEDTLS_ECDH_C) \|\| defined(MBEDTLS_ECDSA_C) \|\| \
markrad	0:cdf462088d13	1197	defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
markrad	0:cdf462088d13	1198	static int ssl_parse_supported_point_formats_ext( mbedtls_ssl_context *ssl,
markrad	0:cdf462088d13	1199	const unsigned char *buf,
markrad	0:cdf462088d13	1200	size_t len )
markrad	0:cdf462088d13	1201	{
markrad	0:cdf462088d13	1202	size_t list_size;
markrad	0:cdf462088d13	1203	const unsigned char *p;
markrad	0:cdf462088d13	1204
markrad	0:cdf462088d13	1205	list_size = buf[0];
markrad	0:cdf462088d13	1206	if( list_size + 1 != len )
markrad	0:cdf462088d13	1207	{
markrad	0:cdf462088d13	1208	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server hello message" ) );
markrad	0:cdf462088d13	1209	return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
markrad	0:cdf462088d13	1210	}
markrad	0:cdf462088d13	1211
markrad	0:cdf462088d13	1212	p = buf + 1;
markrad	0:cdf462088d13	1213	while( list_size > 0 )
markrad	0:cdf462088d13	1214	{
markrad	0:cdf462088d13	1215	if( p[0] == MBEDTLS_ECP_PF_UNCOMPRESSED \|\|
markrad	0:cdf462088d13	1216	p[0] == MBEDTLS_ECP_PF_COMPRESSED )
markrad	0:cdf462088d13	1217	{
markrad	0:cdf462088d13	1218	#if defined(MBEDTLS_ECDH_C) \|\| defined(MBEDTLS_ECDSA_C)
markrad	0:cdf462088d13	1219	ssl->handshake->ecdh_ctx.point_format = p[0];
markrad	0:cdf462088d13	1220	#endif
markrad	0:cdf462088d13	1221	#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
markrad	0:cdf462088d13	1222	ssl->handshake->ecjpake_ctx.point_format = p[0];
markrad	0:cdf462088d13	1223	#endif
markrad	0:cdf462088d13	1224	MBEDTLS_SSL_DEBUG_MSG( 4, ( "point format selected: %d", p[0] ) );
markrad	0:cdf462088d13	1225	return( 0 );
markrad	0:cdf462088d13	1226	}
markrad	0:cdf462088d13	1227
markrad	0:cdf462088d13	1228	list_size--;
markrad	0:cdf462088d13	1229	p++;
markrad	0:cdf462088d13	1230	}
markrad	0:cdf462088d13	1231
markrad	0:cdf462088d13	1232	MBEDTLS_SSL_DEBUG_MSG( 1, ( "no point format in common" ) );
markrad	0:cdf462088d13	1233	return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
markrad	0:cdf462088d13	1234	}
markrad	0:cdf462088d13	1235	#endif /* MBEDTLS_ECDH_C \|\| MBEDTLS_ECDSA_C \|\|
markrad	0:cdf462088d13	1236	MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */
markrad	0:cdf462088d13	1237
markrad	0:cdf462088d13	1238	#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
markrad	0:cdf462088d13	1239	static int ssl_parse_ecjpake_kkpp( mbedtls_ssl_context *ssl,
markrad	0:cdf462088d13	1240	const unsigned char *buf,
markrad	0:cdf462088d13	1241	size_t len )
markrad	0:cdf462088d13	1242	{
markrad	0:cdf462088d13	1243	int ret;
markrad	0:cdf462088d13	1244
markrad	0:cdf462088d13	1245	if( ssl->transform_negotiate->ciphersuite_info->key_exchange !=
markrad	0:cdf462088d13	1246	MBEDTLS_KEY_EXCHANGE_ECJPAKE )
markrad	0:cdf462088d13	1247	{
markrad	0:cdf462088d13	1248	MBEDTLS_SSL_DEBUG_MSG( 3, ( "skip ecjpake kkpp extension" ) );
markrad	0:cdf462088d13	1249	return( 0 );
markrad	0:cdf462088d13	1250	}
markrad	0:cdf462088d13	1251
markrad	0:cdf462088d13	1252	/* If we got here, we no longer need our cached extension */
markrad	0:cdf462088d13	1253	mbedtls_free( ssl->handshake->ecjpake_cache );
markrad	0:cdf462088d13	1254	ssl->handshake->ecjpake_cache = NULL;
markrad	0:cdf462088d13	1255	ssl->handshake->ecjpake_cache_len = 0;
markrad	0:cdf462088d13	1256
markrad	0:cdf462088d13	1257	if( ( ret = mbedtls_ecjpake_read_round_one( &ssl->handshake->ecjpake_ctx,
markrad	0:cdf462088d13	1258	buf, len ) ) != 0 )
markrad	0:cdf462088d13	1259	{
markrad	0:cdf462088d13	1260	MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecjpake_read_round_one", ret );
markrad	0:cdf462088d13	1261	return( ret );
markrad	0:cdf462088d13	1262	}
markrad	0:cdf462088d13	1263
markrad	0:cdf462088d13	1264	return( 0 );
markrad	0:cdf462088d13	1265	}
markrad	0:cdf462088d13	1266	#endif /* MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */
markrad	0:cdf462088d13	1267
markrad	0:cdf462088d13	1268	#if defined(MBEDTLS_SSL_ALPN)
markrad	0:cdf462088d13	1269	static int ssl_parse_alpn_ext( mbedtls_ssl_context *ssl,
markrad	0:cdf462088d13	1270	const unsigned char *buf, size_t len )
markrad	0:cdf462088d13	1271	{
markrad	0:cdf462088d13	1272	size_t list_len, name_len;
markrad	0:cdf462088d13	1273	const char **p;
markrad	0:cdf462088d13	1274
markrad	0:cdf462088d13	1275	/* If we didn't send it, the server shouldn't send it */
markrad	0:cdf462088d13	1276	if( ssl->conf->alpn_list == NULL )
markrad	0:cdf462088d13	1277	return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
markrad	0:cdf462088d13	1278
markrad	0:cdf462088d13	1279	/*
markrad	0:cdf462088d13	1280	* opaque ProtocolName<1..2^8-1>;
markrad	0:cdf462088d13	1281	*
markrad	0:cdf462088d13	1282	* struct {
markrad	0:cdf462088d13	1283	* ProtocolName protocol_name_list<2..2^16-1>
markrad	0:cdf462088d13	1284	* } ProtocolNameList;
markrad	0:cdf462088d13	1285	*
markrad	0:cdf462088d13	1286	* the "ProtocolNameList" MUST contain exactly one "ProtocolName"
markrad	0:cdf462088d13	1287	*/
markrad	0:cdf462088d13	1288
markrad	0:cdf462088d13	1289	/* Min length is 2 (list_len) + 1 (name_len) + 1 (name) */
markrad	0:cdf462088d13	1290	if( len < 4 )
markrad	0:cdf462088d13	1291	return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
markrad	0:cdf462088d13	1292
markrad	0:cdf462088d13	1293	list_len = ( buf[0] << 8 ) \| buf[1];
markrad	0:cdf462088d13	1294	if( list_len != len - 2 )
markrad	0:cdf462088d13	1295	return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
markrad	0:cdf462088d13	1296
markrad	0:cdf462088d13	1297	name_len = buf[2];
markrad	0:cdf462088d13	1298	if( name_len != list_len - 1 )
markrad	0:cdf462088d13	1299	return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
markrad	0:cdf462088d13	1300
markrad	0:cdf462088d13	1301	/* Check that the server chosen protocol was in our list and save it */
markrad	0:cdf462088d13	1302	for( p = ssl->conf->alpn_list; *p != NULL; p++ )
markrad	0:cdf462088d13	1303	{
markrad	0:cdf462088d13	1304	if( name_len == strlen( *p ) &&
markrad	0:cdf462088d13	1305	memcmp( buf + 3, *p, name_len ) == 0 )
markrad	0:cdf462088d13	1306	{
markrad	0:cdf462088d13	1307	ssl->alpn_chosen = *p;
markrad	0:cdf462088d13	1308	return( 0 );
markrad	0:cdf462088d13	1309	}
markrad	0:cdf462088d13	1310	}
markrad	0:cdf462088d13	1311
markrad	0:cdf462088d13	1312	return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
markrad	0:cdf462088d13	1313	}
markrad	0:cdf462088d13	1314	#endif /* MBEDTLS_SSL_ALPN */
markrad	0:cdf462088d13	1315
markrad	0:cdf462088d13	1316	/*
markrad	0:cdf462088d13	1317	* Parse HelloVerifyRequest. Only called after verifying the HS type.
markrad	0:cdf462088d13	1318	*/
markrad	0:cdf462088d13	1319	#if defined(MBEDTLS_SSL_PROTO_DTLS)
markrad	0:cdf462088d13	1320	static int ssl_parse_hello_verify_request( mbedtls_ssl_context *ssl )
markrad	0:cdf462088d13	1321	{
markrad	0:cdf462088d13	1322	const unsigned char *p = ssl->in_msg + mbedtls_ssl_hs_hdr_len( ssl );
markrad	0:cdf462088d13	1323	int major_ver, minor_ver;
markrad	0:cdf462088d13	1324	unsigned char cookie_len;
markrad	0:cdf462088d13	1325
markrad	0:cdf462088d13	1326	MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse hello verify request" ) );
markrad	0:cdf462088d13	1327
markrad	0:cdf462088d13	1328	/*
markrad	0:cdf462088d13	1329	* struct {
markrad	0:cdf462088d13	1330	* ProtocolVersion server_version;
markrad	0:cdf462088d13	1331	* opaque cookie<0..2^8-1>;
markrad	0:cdf462088d13	1332	* } HelloVerifyRequest;
markrad	0:cdf462088d13	1333	*/
markrad	0:cdf462088d13	1334	MBEDTLS_SSL_DEBUG_BUF( 3, "server version", p, 2 );
markrad	0:cdf462088d13	1335	mbedtls_ssl_read_version( &major_ver, &minor_ver, ssl->conf->transport, p );
markrad	0:cdf462088d13	1336	p += 2;
markrad	0:cdf462088d13	1337
markrad	0:cdf462088d13	1338	/*
markrad	0:cdf462088d13	1339	* Since the RFC is not clear on this point, accept DTLS 1.0 (TLS 1.1)
markrad	0:cdf462088d13	1340	* even is lower than our min version.
markrad	0:cdf462088d13	1341	*/
markrad	0:cdf462088d13	1342	if( major_ver < MBEDTLS_SSL_MAJOR_VERSION_3 \|\|
markrad	0:cdf462088d13	1343	minor_ver < MBEDTLS_SSL_MINOR_VERSION_2 \|\|
markrad	0:cdf462088d13	1344	major_ver > ssl->conf->max_major_ver \|\|
markrad	0:cdf462088d13	1345	minor_ver > ssl->conf->max_minor_ver )
markrad	0:cdf462088d13	1346	{
markrad	0:cdf462088d13	1347	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server version" ) );
markrad	0:cdf462088d13	1348
markrad	0:cdf462088d13	1349	mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
markrad	0:cdf462088d13	1350	MBEDTLS_SSL_ALERT_MSG_PROTOCOL_VERSION );
markrad	0:cdf462088d13	1351
markrad	0:cdf462088d13	1352	return( MBEDTLS_ERR_SSL_BAD_HS_PROTOCOL_VERSION );
markrad	0:cdf462088d13	1353	}
markrad	0:cdf462088d13	1354
markrad	0:cdf462088d13	1355	cookie_len = *p++;
markrad	0:cdf462088d13	1356	MBEDTLS_SSL_DEBUG_BUF( 3, "cookie", p, cookie_len );
markrad	0:cdf462088d13	1357
markrad	0:cdf462088d13	1358	if( ( ssl->in_msg + ssl->in_msglen ) - p < cookie_len )
markrad	0:cdf462088d13	1359	{
markrad	0:cdf462088d13	1360	MBEDTLS_SSL_DEBUG_MSG( 1,
markrad	0:cdf462088d13	1361	( "cookie length does not match incoming message size" ) );
markrad	0:cdf462088d13	1362	mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
markrad	0:cdf462088d13	1363	MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
markrad	0:cdf462088d13	1364	return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
markrad	0:cdf462088d13	1365	}
markrad	0:cdf462088d13	1366
markrad	0:cdf462088d13	1367	mbedtls_free( ssl->handshake->verify_cookie );
markrad	0:cdf462088d13	1368
markrad	0:cdf462088d13	1369	ssl->handshake->verify_cookie = mbedtls_calloc( 1, cookie_len );
markrad	0:cdf462088d13	1370	if( ssl->handshake->verify_cookie == NULL )
markrad	0:cdf462088d13	1371	{
markrad	0:cdf462088d13	1372	MBEDTLS_SSL_DEBUG_MSG( 1, ( "alloc failed (%d bytes)", cookie_len ) );
markrad	0:cdf462088d13	1373	return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
markrad	0:cdf462088d13	1374	}
markrad	0:cdf462088d13	1375
markrad	0:cdf462088d13	1376	memcpy( ssl->handshake->verify_cookie, p, cookie_len );
markrad	0:cdf462088d13	1377	ssl->handshake->verify_cookie_len = cookie_len;
markrad	0:cdf462088d13	1378
markrad	0:cdf462088d13	1379	/* Start over at ClientHello */
markrad	0:cdf462088d13	1380	ssl->state = MBEDTLS_SSL_CLIENT_HELLO;
markrad	0:cdf462088d13	1381	mbedtls_ssl_reset_checksum( ssl );
markrad	0:cdf462088d13	1382
markrad	0:cdf462088d13	1383	mbedtls_ssl_recv_flight_completed( ssl );
markrad	0:cdf462088d13	1384
markrad	0:cdf462088d13	1385	MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse hello verify request" ) );
markrad	0:cdf462088d13	1386
markrad	0:cdf462088d13	1387	return( 0 );
markrad	0:cdf462088d13	1388	}
markrad	0:cdf462088d13	1389	#endif /* MBEDTLS_SSL_PROTO_DTLS */
markrad	0:cdf462088d13	1390
markrad	0:cdf462088d13	1391	static int ssl_parse_server_hello( mbedtls_ssl_context *ssl )
markrad	0:cdf462088d13	1392	{
markrad	0:cdf462088d13	1393	int ret, i;
markrad	0:cdf462088d13	1394	size_t n;
markrad	0:cdf462088d13	1395	size_t ext_len;
markrad	0:cdf462088d13	1396	unsigned char buf, ext;
markrad	0:cdf462088d13	1397	unsigned char comp;
markrad	0:cdf462088d13	1398	#if defined(MBEDTLS_ZLIB_SUPPORT)
markrad	0:cdf462088d13	1399	int accept_comp;
markrad	0:cdf462088d13	1400	#endif
markrad	0:cdf462088d13	1401	#if defined(MBEDTLS_SSL_RENEGOTIATION)
markrad	0:cdf462088d13	1402	int renegotiation_info_seen = 0;
markrad	0:cdf462088d13	1403	#endif
markrad	0:cdf462088d13	1404	int handshake_failure = 0;
markrad	0:cdf462088d13	1405	const mbedtls_ssl_ciphersuite_t *suite_info;
markrad	0:cdf462088d13	1406	#if defined(MBEDTLS_DEBUG_C)
markrad	0:cdf462088d13	1407	uint32_t t;
markrad	0:cdf462088d13	1408	#endif
markrad	0:cdf462088d13	1409
markrad	0:cdf462088d13	1410	MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse server hello" ) );
markrad	0:cdf462088d13	1411
markrad	0:cdf462088d13	1412	buf = ssl->in_msg;
markrad	0:cdf462088d13	1413
markrad	0:cdf462088d13	1414	if( ( ret = mbedtls_ssl_read_record( ssl ) ) != 0 )
markrad	0:cdf462088d13	1415	{
markrad	0:cdf462088d13	1416	MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_read_record", ret );
markrad	0:cdf462088d13	1417	return( ret );
markrad	0:cdf462088d13	1418	}
markrad	0:cdf462088d13	1419
markrad	0:cdf462088d13	1420	if( ssl->in_msgtype != MBEDTLS_SSL_MSG_HANDSHAKE )
markrad	0:cdf462088d13	1421	{
markrad	0:cdf462088d13	1422	#if defined(MBEDTLS_SSL_RENEGOTIATION)
markrad	0:cdf462088d13	1423	if( ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS )
markrad	0:cdf462088d13	1424	{
markrad	0:cdf462088d13	1425	ssl->renego_records_seen++;
markrad	0:cdf462088d13	1426
markrad	0:cdf462088d13	1427	if( ssl->conf->renego_max_records >= 0 &&
markrad	0:cdf462088d13	1428	ssl->renego_records_seen > ssl->conf->renego_max_records )
markrad	0:cdf462088d13	1429	{
markrad	0:cdf462088d13	1430	MBEDTLS_SSL_DEBUG_MSG( 1, ( "renegotiation requested, "
markrad	0:cdf462088d13	1431	"but not honored by server" ) );
markrad	0:cdf462088d13	1432	return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE );
markrad	0:cdf462088d13	1433	}
markrad	0:cdf462088d13	1434
markrad	0:cdf462088d13	1435	MBEDTLS_SSL_DEBUG_MSG( 1, ( "non-handshake message during renego" ) );
markrad	0:cdf462088d13	1436	return( MBEDTLS_ERR_SSL_WAITING_SERVER_HELLO_RENEGO );
markrad	0:cdf462088d13	1437	}
markrad	0:cdf462088d13	1438	#endif /* MBEDTLS_SSL_RENEGOTIATION */
markrad	0:cdf462088d13	1439
markrad	0:cdf462088d13	1440	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server hello message" ) );
markrad	0:cdf462088d13	1441	return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE );
markrad	0:cdf462088d13	1442	}
markrad	0:cdf462088d13	1443
markrad	0:cdf462088d13	1444	#if defined(MBEDTLS_SSL_PROTO_DTLS)
markrad	0:cdf462088d13	1445	if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
markrad	0:cdf462088d13	1446	{
markrad	0:cdf462088d13	1447	if( buf[0] == MBEDTLS_SSL_HS_HELLO_VERIFY_REQUEST )
markrad	0:cdf462088d13	1448	{
markrad	0:cdf462088d13	1449	MBEDTLS_SSL_DEBUG_MSG( 2, ( "received hello verify request" ) );
markrad	0:cdf462088d13	1450	MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse server hello" ) );
markrad	0:cdf462088d13	1451	return( ssl_parse_hello_verify_request( ssl ) );
markrad	0:cdf462088d13	1452	}
markrad	0:cdf462088d13	1453	else
markrad	0:cdf462088d13	1454	{
markrad	0:cdf462088d13	1455	/* We made it through the verification process */
markrad	0:cdf462088d13	1456	mbedtls_free( ssl->handshake->verify_cookie );
markrad	0:cdf462088d13	1457	ssl->handshake->verify_cookie = NULL;
markrad	0:cdf462088d13	1458	ssl->handshake->verify_cookie_len = 0;
markrad	0:cdf462088d13	1459	}
markrad	0:cdf462088d13	1460	}
markrad	0:cdf462088d13	1461	#endif /* MBEDTLS_SSL_PROTO_DTLS */
markrad	0:cdf462088d13	1462
markrad	0:cdf462088d13	1463	if( ssl->in_hslen < 38 + mbedtls_ssl_hs_hdr_len( ssl ) \|\|
markrad	0:cdf462088d13	1464	buf[0] != MBEDTLS_SSL_HS_SERVER_HELLO )
markrad	0:cdf462088d13	1465	{
markrad	0:cdf462088d13	1466	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server hello message" ) );
markrad	0:cdf462088d13	1467	return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
markrad	0:cdf462088d13	1468	}
markrad	0:cdf462088d13	1469
markrad	0:cdf462088d13	1470	/*
markrad	0:cdf462088d13	1471	* 0 . 1 server_version
markrad	0:cdf462088d13	1472	* 2 . 33 random (maybe including 4 bytes of Unix time)
markrad	0:cdf462088d13	1473	* 34 . 34 session_id length = n
markrad	0:cdf462088d13	1474	* 35 . 34+n session_id
markrad	0:cdf462088d13	1475	* 35+n . 36+n cipher_suite
markrad	0:cdf462088d13	1476	* 37+n . 37+n compression_method
markrad	0:cdf462088d13	1477	*
markrad	0:cdf462088d13	1478	* 38+n . 39+n extensions length (optional)
markrad	0:cdf462088d13	1479	* 40+n . .. extensions
markrad	0:cdf462088d13	1480	*/
markrad	0:cdf462088d13	1481	buf += mbedtls_ssl_hs_hdr_len( ssl );
markrad	0:cdf462088d13	1482
markrad	0:cdf462088d13	1483	MBEDTLS_SSL_DEBUG_BUF( 3, "server hello, version", buf + 0, 2 );
markrad	0:cdf462088d13	1484	mbedtls_ssl_read_version( &ssl->major_ver, &ssl->minor_ver,
markrad	0:cdf462088d13	1485	ssl->conf->transport, buf + 0 );
markrad	0:cdf462088d13	1486
markrad	0:cdf462088d13	1487	if( ssl->major_ver < ssl->conf->min_major_ver \|\|
markrad	0:cdf462088d13	1488	ssl->minor_ver < ssl->conf->min_minor_ver \|\|
markrad	0:cdf462088d13	1489	ssl->major_ver > ssl->conf->max_major_ver \|\|
markrad	0:cdf462088d13	1490	ssl->minor_ver > ssl->conf->max_minor_ver )
markrad	0:cdf462088d13	1491	{
markrad	0:cdf462088d13	1492	MBEDTLS_SSL_DEBUG_MSG( 1, ( "server version out of bounds - "
markrad	0:cdf462088d13	1493	" min: [%d:%d], server: [%d:%d], max: [%d:%d]",
markrad	0:cdf462088d13	1494	ssl->conf->min_major_ver, ssl->conf->min_minor_ver,
markrad	0:cdf462088d13	1495	ssl->major_ver, ssl->minor_ver,
markrad	0:cdf462088d13	1496	ssl->conf->max_major_ver, ssl->conf->max_minor_ver ) );
markrad	0:cdf462088d13	1497
markrad	0:cdf462088d13	1498	mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
markrad	0:cdf462088d13	1499	MBEDTLS_SSL_ALERT_MSG_PROTOCOL_VERSION );
markrad	0:cdf462088d13	1500
markrad	0:cdf462088d13	1501	return( MBEDTLS_ERR_SSL_BAD_HS_PROTOCOL_VERSION );
markrad	0:cdf462088d13	1502	}
markrad	0:cdf462088d13	1503
markrad	0:cdf462088d13	1504	#if defined(MBEDTLS_DEBUG_C)
markrad	0:cdf462088d13	1505	t = ( (uint32_t) buf[2] << 24 )
markrad	0:cdf462088d13	1506	\| ( (uint32_t) buf[3] << 16 )
markrad	0:cdf462088d13	1507	\| ( (uint32_t) buf[4] << 8 )
markrad	0:cdf462088d13	1508	\| ( (uint32_t) buf[5] );
markrad	0:cdf462088d13	1509	MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, current time: %lu", t ) );
markrad	0:cdf462088d13	1510	#endif
markrad	0:cdf462088d13	1511
markrad	0:cdf462088d13	1512	memcpy( ssl->handshake->randbytes + 32, buf + 2, 32 );
markrad	0:cdf462088d13	1513
markrad	0:cdf462088d13	1514	n = buf[34];
markrad	0:cdf462088d13	1515
markrad	0:cdf462088d13	1516	MBEDTLS_SSL_DEBUG_BUF( 3, "server hello, random bytes", buf + 2, 32 );
markrad	0:cdf462088d13	1517
markrad	0:cdf462088d13	1518	if( n > 32 )
markrad	0:cdf462088d13	1519	{
markrad	0:cdf462088d13	1520	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server hello message" ) );
markrad	0:cdf462088d13	1521	return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
markrad	0:cdf462088d13	1522	}
markrad	0:cdf462088d13	1523
markrad	0:cdf462088d13	1524	if( ssl->in_hslen > mbedtls_ssl_hs_hdr_len( ssl ) + 39 + n )
markrad	0:cdf462088d13	1525	{
markrad	0:cdf462088d13	1526	ext_len = ( ( buf[38 + n] << 8 )
markrad	0:cdf462088d13	1527	\| ( buf[39 + n] ) );
markrad	0:cdf462088d13	1528
markrad	0:cdf462088d13	1529	if( ( ext_len > 0 && ext_len < 4 ) \|\|
markrad	0:cdf462088d13	1530	ssl->in_hslen != mbedtls_ssl_hs_hdr_len( ssl ) + 40 + n + ext_len )
markrad	0:cdf462088d13	1531	{
markrad	0:cdf462088d13	1532	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server hello message" ) );
markrad	0:cdf462088d13	1533	return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
markrad	0:cdf462088d13	1534	}
markrad	0:cdf462088d13	1535	}
markrad	0:cdf462088d13	1536	else if( ssl->in_hslen == mbedtls_ssl_hs_hdr_len( ssl ) + 38 + n )
markrad	0:cdf462088d13	1537	{
markrad	0:cdf462088d13	1538	ext_len = 0;
markrad	0:cdf462088d13	1539	}
markrad	0:cdf462088d13	1540	else
markrad	0:cdf462088d13	1541	{
markrad	0:cdf462088d13	1542	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server hello message" ) );
markrad	0:cdf462088d13	1543	return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
markrad	0:cdf462088d13	1544	}
markrad	0:cdf462088d13	1545
markrad	0:cdf462088d13	1546	/* ciphersuite (used later) */
markrad	0:cdf462088d13	1547	i = ( buf[35 + n] << 8 ) \| buf[36 + n];
markrad	0:cdf462088d13	1548
markrad	0:cdf462088d13	1549	/*
markrad	0:cdf462088d13	1550	* Read and check compression
markrad	0:cdf462088d13	1551	*/
markrad	0:cdf462088d13	1552	comp = buf[37 + n];
markrad	0:cdf462088d13	1553
markrad	0:cdf462088d13	1554	#if defined(MBEDTLS_ZLIB_SUPPORT)
markrad	0:cdf462088d13	1555	/* See comments in ssl_write_client_hello() */
markrad	0:cdf462088d13	1556	#if defined(MBEDTLS_SSL_PROTO_DTLS)
markrad	0:cdf462088d13	1557	if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
markrad	0:cdf462088d13	1558	accept_comp = 0;
markrad	0:cdf462088d13	1559	else
markrad	0:cdf462088d13	1560	#endif
markrad	0:cdf462088d13	1561	accept_comp = 1;
markrad	0:cdf462088d13	1562
markrad	0:cdf462088d13	1563	if( comp != MBEDTLS_SSL_COMPRESS_NULL &&
markrad	0:cdf462088d13	1564	( comp != MBEDTLS_SSL_COMPRESS_DEFLATE \|\| accept_comp == 0 ) )
markrad	0:cdf462088d13	1565	#else /* MBEDTLS_ZLIB_SUPPORT */
markrad	0:cdf462088d13	1566	if( comp != MBEDTLS_SSL_COMPRESS_NULL )
markrad	0:cdf462088d13	1567	#endif/* MBEDTLS_ZLIB_SUPPORT */
markrad	0:cdf462088d13	1568	{
markrad	0:cdf462088d13	1569	MBEDTLS_SSL_DEBUG_MSG( 1, ( "server hello, bad compression: %d", comp ) );
markrad	0:cdf462088d13	1570	return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE );
markrad	0:cdf462088d13	1571	}
markrad	0:cdf462088d13	1572
markrad	0:cdf462088d13	1573	/*
markrad	0:cdf462088d13	1574	* Initialize update checksum functions
markrad	0:cdf462088d13	1575	*/
markrad	0:cdf462088d13	1576	ssl->transform_negotiate->ciphersuite_info = mbedtls_ssl_ciphersuite_from_id( i );
markrad	0:cdf462088d13	1577
markrad	0:cdf462088d13	1578	if( ssl->transform_negotiate->ciphersuite_info == NULL )
markrad	0:cdf462088d13	1579	{
markrad	0:cdf462088d13	1580	MBEDTLS_SSL_DEBUG_MSG( 1, ( "ciphersuite info for %04x not found", i ) );
markrad	0:cdf462088d13	1581	return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
markrad	0:cdf462088d13	1582	}
markrad	0:cdf462088d13	1583
markrad	0:cdf462088d13	1584	mbedtls_ssl_optimize_checksum( ssl, ssl->transform_negotiate->ciphersuite_info );
markrad	0:cdf462088d13	1585
markrad	0:cdf462088d13	1586	MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, session id len.: %d", n ) );
markrad	0:cdf462088d13	1587	MBEDTLS_SSL_DEBUG_BUF( 3, "server hello, session id", buf + 35, n );
markrad	0:cdf462088d13	1588
markrad	0:cdf462088d13	1589	/*
markrad	0:cdf462088d13	1590	* Check if the session can be resumed
markrad	0:cdf462088d13	1591	*/
markrad	0:cdf462088d13	1592	if( ssl->handshake->resume == 0 \|\| n == 0 \|\|
markrad	0:cdf462088d13	1593	#if defined(MBEDTLS_SSL_RENEGOTIATION)
markrad	0:cdf462088d13	1594	ssl->renego_status != MBEDTLS_SSL_INITIAL_HANDSHAKE \|\|
markrad	0:cdf462088d13	1595	#endif
markrad	0:cdf462088d13	1596	ssl->session_negotiate->ciphersuite != i \|\|
markrad	0:cdf462088d13	1597	ssl->session_negotiate->compression != comp \|\|
markrad	0:cdf462088d13	1598	ssl->session_negotiate->id_len != n \|\|
markrad	0:cdf462088d13	1599	memcmp( ssl->session_negotiate->id, buf + 35, n ) != 0 )
markrad	0:cdf462088d13	1600	{
markrad	0:cdf462088d13	1601	ssl->state++;
markrad	0:cdf462088d13	1602	ssl->handshake->resume = 0;
markrad	0:cdf462088d13	1603	#if defined(MBEDTLS_HAVE_TIME)
markrad	0:cdf462088d13	1604	ssl->session_negotiate->start = mbedtls_time( NULL );
markrad	0:cdf462088d13	1605	#endif
markrad	0:cdf462088d13	1606	ssl->session_negotiate->ciphersuite = i;
markrad	0:cdf462088d13	1607	ssl->session_negotiate->compression = comp;
markrad	0:cdf462088d13	1608	ssl->session_negotiate->id_len = n;
markrad	0:cdf462088d13	1609	memcpy( ssl->session_negotiate->id, buf + 35, n );
markrad	0:cdf462088d13	1610	}
markrad	0:cdf462088d13	1611	else
markrad	0:cdf462088d13	1612	{
markrad	0:cdf462088d13	1613	ssl->state = MBEDTLS_SSL_SERVER_CHANGE_CIPHER_SPEC;
markrad	0:cdf462088d13	1614
markrad	0:cdf462088d13	1615	if( ( ret = mbedtls_ssl_derive_keys( ssl ) ) != 0 )
markrad	0:cdf462088d13	1616	{
markrad	0:cdf462088d13	1617	MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_derive_keys", ret );
markrad	0:cdf462088d13	1618	return( ret );
markrad	0:cdf462088d13	1619	}
markrad	0:cdf462088d13	1620	}
markrad	0:cdf462088d13	1621
markrad	0:cdf462088d13	1622	MBEDTLS_SSL_DEBUG_MSG( 3, ( "%s session has been resumed",
markrad	0:cdf462088d13	1623	ssl->handshake->resume ? "a" : "no" ) );
markrad	0:cdf462088d13	1624
markrad	0:cdf462088d13	1625	MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, chosen ciphersuite: %04x", i ) );
markrad	0:cdf462088d13	1626	MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, compress alg.: %d", buf[37 + n] ) );
markrad	0:cdf462088d13	1627
markrad	0:cdf462088d13	1628	suite_info = mbedtls_ssl_ciphersuite_from_id( ssl->session_negotiate->ciphersuite );
markrad	0:cdf462088d13	1629	if( suite_info == NULL
markrad	0:cdf462088d13	1630	#if defined(MBEDTLS_ARC4_C)
markrad	0:cdf462088d13	1631	\|\| ( ssl->conf->arc4_disabled &&
markrad	0:cdf462088d13	1632	suite_info->cipher == MBEDTLS_CIPHER_ARC4_128 )
markrad	0:cdf462088d13	1633	#endif
markrad	0:cdf462088d13	1634	)
markrad	0:cdf462088d13	1635	{
markrad	0:cdf462088d13	1636	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server hello message" ) );
markrad	0:cdf462088d13	1637	return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
markrad	0:cdf462088d13	1638	}
markrad	0:cdf462088d13	1639
markrad	0:cdf462088d13	1640	MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, chosen ciphersuite: %s", suite_info->name ) );
markrad	0:cdf462088d13	1641
markrad	0:cdf462088d13	1642	i = 0;
markrad	0:cdf462088d13	1643	while( 1 )
markrad	0:cdf462088d13	1644	{
markrad	0:cdf462088d13	1645	if( ssl->conf->ciphersuite_list[ssl->minor_ver][i] == 0 )
markrad	0:cdf462088d13	1646	{
markrad	0:cdf462088d13	1647	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server hello message" ) );
markrad	0:cdf462088d13	1648	return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
markrad	0:cdf462088d13	1649	}
markrad	0:cdf462088d13	1650
markrad	0:cdf462088d13	1651	if( ssl->conf->ciphersuite_list[ssl->minor_ver][i++] ==
markrad	0:cdf462088d13	1652	ssl->session_negotiate->ciphersuite )
markrad	0:cdf462088d13	1653	{
markrad	0:cdf462088d13	1654	break;
markrad	0:cdf462088d13	1655	}
markrad	0:cdf462088d13	1656	}
markrad	0:cdf462088d13	1657
markrad	0:cdf462088d13	1658	if( comp != MBEDTLS_SSL_COMPRESS_NULL
markrad	0:cdf462088d13	1659	#if defined(MBEDTLS_ZLIB_SUPPORT)
markrad	0:cdf462088d13	1660	&& comp != MBEDTLS_SSL_COMPRESS_DEFLATE
markrad	0:cdf462088d13	1661	#endif
markrad	0:cdf462088d13	1662	)
markrad	0:cdf462088d13	1663	{
markrad	0:cdf462088d13	1664	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server hello message" ) );
markrad	0:cdf462088d13	1665	return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
markrad	0:cdf462088d13	1666	}
markrad	0:cdf462088d13	1667	ssl->session_negotiate->compression = comp;
markrad	0:cdf462088d13	1668
markrad	0:cdf462088d13	1669	ext = buf + 40 + n;
markrad	0:cdf462088d13	1670
markrad	0:cdf462088d13	1671	MBEDTLS_SSL_DEBUG_MSG( 2, ( "server hello, total extension length: %d", ext_len ) );
markrad	0:cdf462088d13	1672
markrad	0:cdf462088d13	1673	while( ext_len )
markrad	0:cdf462088d13	1674	{
markrad	0:cdf462088d13	1675	unsigned int ext_id = ( ( ext[0] << 8 )
markrad	0:cdf462088d13	1676	\| ( ext[1] ) );
markrad	0:cdf462088d13	1677	unsigned int ext_size = ( ( ext[2] << 8 )
markrad	0:cdf462088d13	1678	\| ( ext[3] ) );
markrad	0:cdf462088d13	1679
markrad	0:cdf462088d13	1680	if( ext_size + 4 > ext_len )
markrad	0:cdf462088d13	1681	{
markrad	0:cdf462088d13	1682	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server hello message" ) );
markrad	0:cdf462088d13	1683	return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
markrad	0:cdf462088d13	1684	}
markrad	0:cdf462088d13	1685
markrad	0:cdf462088d13	1686	switch( ext_id )
markrad	0:cdf462088d13	1687	{
markrad	0:cdf462088d13	1688	case MBEDTLS_TLS_EXT_RENEGOTIATION_INFO:
markrad	0:cdf462088d13	1689	MBEDTLS_SSL_DEBUG_MSG( 3, ( "found renegotiation extension" ) );
markrad	0:cdf462088d13	1690	#if defined(MBEDTLS_SSL_RENEGOTIATION)
markrad	0:cdf462088d13	1691	renegotiation_info_seen = 1;
markrad	0:cdf462088d13	1692	#endif
markrad	0:cdf462088d13	1693
markrad	0:cdf462088d13	1694	if( ( ret = ssl_parse_renegotiation_info( ssl, ext + 4,
markrad	0:cdf462088d13	1695	ext_size ) ) != 0 )
markrad	0:cdf462088d13	1696	return( ret );
markrad	0:cdf462088d13	1697
markrad	0:cdf462088d13	1698	break;
markrad	0:cdf462088d13	1699
markrad	0:cdf462088d13	1700	#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
markrad	0:cdf462088d13	1701	case MBEDTLS_TLS_EXT_MAX_FRAGMENT_LENGTH:
markrad	0:cdf462088d13	1702	MBEDTLS_SSL_DEBUG_MSG( 3, ( "found max_fragment_length extension" ) );
markrad	0:cdf462088d13	1703
markrad	0:cdf462088d13	1704	if( ( ret = ssl_parse_max_fragment_length_ext( ssl,
markrad	0:cdf462088d13	1705	ext + 4, ext_size ) ) != 0 )
markrad	0:cdf462088d13	1706	{
markrad	0:cdf462088d13	1707	return( ret );
markrad	0:cdf462088d13	1708	}
markrad	0:cdf462088d13	1709
markrad	0:cdf462088d13	1710	break;
markrad	0:cdf462088d13	1711	#endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */
markrad	0:cdf462088d13	1712
markrad	0:cdf462088d13	1713	#if defined(MBEDTLS_SSL_TRUNCATED_HMAC)
markrad	0:cdf462088d13	1714	case MBEDTLS_TLS_EXT_TRUNCATED_HMAC:
markrad	0:cdf462088d13	1715	MBEDTLS_SSL_DEBUG_MSG( 3, ( "found truncated_hmac extension" ) );
markrad	0:cdf462088d13	1716
markrad	0:cdf462088d13	1717	if( ( ret = ssl_parse_truncated_hmac_ext( ssl,
markrad	0:cdf462088d13	1718	ext + 4, ext_size ) ) != 0 )
markrad	0:cdf462088d13	1719	{
markrad	0:cdf462088d13	1720	return( ret );
markrad	0:cdf462088d13	1721	}
markrad	0:cdf462088d13	1722
markrad	0:cdf462088d13	1723	break;
markrad	0:cdf462088d13	1724	#endif /* MBEDTLS_SSL_TRUNCATED_HMAC */
markrad	0:cdf462088d13	1725
markrad	0:cdf462088d13	1726	#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
markrad	0:cdf462088d13	1727	case MBEDTLS_TLS_EXT_ENCRYPT_THEN_MAC:
markrad	0:cdf462088d13	1728	MBEDTLS_SSL_DEBUG_MSG( 3, ( "found encrypt_then_mac extension" ) );
markrad	0:cdf462088d13	1729
markrad	0:cdf462088d13	1730	if( ( ret = ssl_parse_encrypt_then_mac_ext( ssl,
markrad	0:cdf462088d13	1731	ext + 4, ext_size ) ) != 0 )
markrad	0:cdf462088d13	1732	{
markrad	0:cdf462088d13	1733	return( ret );
markrad	0:cdf462088d13	1734	}
markrad	0:cdf462088d13	1735
markrad	0:cdf462088d13	1736	break;
markrad	0:cdf462088d13	1737	#endif /* MBEDTLS_SSL_ENCRYPT_THEN_MAC */
markrad	0:cdf462088d13	1738
markrad	0:cdf462088d13	1739	#if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET)
markrad	0:cdf462088d13	1740	case MBEDTLS_TLS_EXT_EXTENDED_MASTER_SECRET:
markrad	0:cdf462088d13	1741	MBEDTLS_SSL_DEBUG_MSG( 3, ( "found extended_master_secret extension" ) );
markrad	0:cdf462088d13	1742
markrad	0:cdf462088d13	1743	if( ( ret = ssl_parse_extended_ms_ext( ssl,
markrad	0:cdf462088d13	1744	ext + 4, ext_size ) ) != 0 )
markrad	0:cdf462088d13	1745	{
markrad	0:cdf462088d13	1746	return( ret );
markrad	0:cdf462088d13	1747	}
markrad	0:cdf462088d13	1748
markrad	0:cdf462088d13	1749	break;
markrad	0:cdf462088d13	1750	#endif /* MBEDTLS_SSL_EXTENDED_MASTER_SECRET */
markrad	0:cdf462088d13	1751
markrad	0:cdf462088d13	1752	#if defined(MBEDTLS_SSL_SESSION_TICKETS)
markrad	0:cdf462088d13	1753	case MBEDTLS_TLS_EXT_SESSION_TICKET:
markrad	0:cdf462088d13	1754	MBEDTLS_SSL_DEBUG_MSG( 3, ( "found session_ticket extension" ) );
markrad	0:cdf462088d13	1755
markrad	0:cdf462088d13	1756	if( ( ret = ssl_parse_session_ticket_ext( ssl,
markrad	0:cdf462088d13	1757	ext + 4, ext_size ) ) != 0 )
markrad	0:cdf462088d13	1758	{
markrad	0:cdf462088d13	1759	return( ret );
markrad	0:cdf462088d13	1760	}
markrad	0:cdf462088d13	1761
markrad	0:cdf462088d13	1762	break;
markrad	0:cdf462088d13	1763	#endif /* MBEDTLS_SSL_SESSION_TICKETS */
markrad	0:cdf462088d13	1764
markrad	0:cdf462088d13	1765	#if defined(MBEDTLS_ECDH_C) \|\| defined(MBEDTLS_ECDSA_C) \|\| \
markrad	0:cdf462088d13	1766	defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
markrad	0:cdf462088d13	1767	case MBEDTLS_TLS_EXT_SUPPORTED_POINT_FORMATS:
markrad	0:cdf462088d13	1768	MBEDTLS_SSL_DEBUG_MSG( 3, ( "found supported_point_formats extension" ) );
markrad	0:cdf462088d13	1769
markrad	0:cdf462088d13	1770	if( ( ret = ssl_parse_supported_point_formats_ext( ssl,
markrad	0:cdf462088d13	1771	ext + 4, ext_size ) ) != 0 )
markrad	0:cdf462088d13	1772	{
markrad	0:cdf462088d13	1773	return( ret );
markrad	0:cdf462088d13	1774	}
markrad	0:cdf462088d13	1775
markrad	0:cdf462088d13	1776	break;
markrad	0:cdf462088d13	1777	#endif /* MBEDTLS_ECDH_C \|\| MBEDTLS_ECDSA_C \|\|
markrad	0:cdf462088d13	1778	MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */
markrad	0:cdf462088d13	1779
markrad	0:cdf462088d13	1780	#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
markrad	0:cdf462088d13	1781	case MBEDTLS_TLS_EXT_ECJPAKE_KKPP:
markrad	0:cdf462088d13	1782	MBEDTLS_SSL_DEBUG_MSG( 3, ( "found ecjpake_kkpp extension" ) );
markrad	0:cdf462088d13	1783
markrad	0:cdf462088d13	1784	if( ( ret = ssl_parse_ecjpake_kkpp( ssl,
markrad	0:cdf462088d13	1785	ext + 4, ext_size ) ) != 0 )
markrad	0:cdf462088d13	1786	{
markrad	0:cdf462088d13	1787	return( ret );
markrad	0:cdf462088d13	1788	}
markrad	0:cdf462088d13	1789
markrad	0:cdf462088d13	1790	break;
markrad	0:cdf462088d13	1791	#endif /* MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */
markrad	0:cdf462088d13	1792
markrad	0:cdf462088d13	1793	#if defined(MBEDTLS_SSL_ALPN)
markrad	0:cdf462088d13	1794	case MBEDTLS_TLS_EXT_ALPN:
markrad	0:cdf462088d13	1795	MBEDTLS_SSL_DEBUG_MSG( 3, ( "found alpn extension" ) );
markrad	0:cdf462088d13	1796
markrad	0:cdf462088d13	1797	if( ( ret = ssl_parse_alpn_ext( ssl, ext + 4, ext_size ) ) != 0 )
markrad	0:cdf462088d13	1798	return( ret );
markrad	0:cdf462088d13	1799
markrad	0:cdf462088d13	1800	break;
markrad	0:cdf462088d13	1801	#endif /* MBEDTLS_SSL_ALPN */
markrad	0:cdf462088d13	1802
markrad	0:cdf462088d13	1803	default:
markrad	0:cdf462088d13	1804	MBEDTLS_SSL_DEBUG_MSG( 3, ( "unknown extension found: %d (ignoring)",
markrad	0:cdf462088d13	1805	ext_id ) );
markrad	0:cdf462088d13	1806	}
markrad	0:cdf462088d13	1807
markrad	0:cdf462088d13	1808	ext_len -= 4 + ext_size;
markrad	0:cdf462088d13	1809	ext += 4 + ext_size;
markrad	0:cdf462088d13	1810
markrad	0:cdf462088d13	1811	if( ext_len > 0 && ext_len < 4 )
markrad	0:cdf462088d13	1812	{
markrad	0:cdf462088d13	1813	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server hello message" ) );
markrad	0:cdf462088d13	1814	return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
markrad	0:cdf462088d13	1815	}
markrad	0:cdf462088d13	1816	}
markrad	0:cdf462088d13	1817
markrad	0:cdf462088d13	1818	/*
markrad	0:cdf462088d13	1819	* Renegotiation security checks
markrad	0:cdf462088d13	1820	*/
markrad	0:cdf462088d13	1821	if( ssl->secure_renegotiation == MBEDTLS_SSL_LEGACY_RENEGOTIATION &&
markrad	0:cdf462088d13	1822	ssl->conf->allow_legacy_renegotiation == MBEDTLS_SSL_LEGACY_BREAK_HANDSHAKE )
markrad	0:cdf462088d13	1823	{
markrad	0:cdf462088d13	1824	MBEDTLS_SSL_DEBUG_MSG( 1, ( "legacy renegotiation, breaking off handshake" ) );
markrad	0:cdf462088d13	1825	handshake_failure = 1;
markrad	0:cdf462088d13	1826	}
markrad	0:cdf462088d13	1827	#if defined(MBEDTLS_SSL_RENEGOTIATION)
markrad	0:cdf462088d13	1828	else if( ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS &&
markrad	0:cdf462088d13	1829	ssl->secure_renegotiation == MBEDTLS_SSL_SECURE_RENEGOTIATION &&
markrad	0:cdf462088d13	1830	renegotiation_info_seen == 0 )
markrad	0:cdf462088d13	1831	{
markrad	0:cdf462088d13	1832	MBEDTLS_SSL_DEBUG_MSG( 1, ( "renegotiation_info extension missing (secure)" ) );
markrad	0:cdf462088d13	1833	handshake_failure = 1;
markrad	0:cdf462088d13	1834	}
markrad	0:cdf462088d13	1835	else if( ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS &&
markrad	0:cdf462088d13	1836	ssl->secure_renegotiation == MBEDTLS_SSL_LEGACY_RENEGOTIATION &&
markrad	0:cdf462088d13	1837	ssl->conf->allow_legacy_renegotiation == MBEDTLS_SSL_LEGACY_NO_RENEGOTIATION )
markrad	0:cdf462088d13	1838	{
markrad	0:cdf462088d13	1839	MBEDTLS_SSL_DEBUG_MSG( 1, ( "legacy renegotiation not allowed" ) );
markrad	0:cdf462088d13	1840	handshake_failure = 1;
markrad	0:cdf462088d13	1841	}
markrad	0:cdf462088d13	1842	else if( ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS &&
markrad	0:cdf462088d13	1843	ssl->secure_renegotiation == MBEDTLS_SSL_LEGACY_RENEGOTIATION &&
markrad	0:cdf462088d13	1844	renegotiation_info_seen == 1 )
markrad	0:cdf462088d13	1845	{
markrad	0:cdf462088d13	1846	MBEDTLS_SSL_DEBUG_MSG( 1, ( "renegotiation_info extension present (legacy)" ) );
markrad	0:cdf462088d13	1847	handshake_failure = 1;
markrad	0:cdf462088d13	1848	}
markrad	0:cdf462088d13	1849	#endif /* MBEDTLS_SSL_RENEGOTIATION */
markrad	0:cdf462088d13	1850
markrad	0:cdf462088d13	1851	if( handshake_failure == 1 )
markrad	0:cdf462088d13	1852	{
markrad	0:cdf462088d13	1853	if( ( ret = mbedtls_ssl_send_fatal_handshake_failure( ssl ) ) != 0 )
markrad	0:cdf462088d13	1854	return( ret );
markrad	0:cdf462088d13	1855
markrad	0:cdf462088d13	1856	return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
markrad	0:cdf462088d13	1857	}
markrad	0:cdf462088d13	1858
markrad	0:cdf462088d13	1859	MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse server hello" ) );
markrad	0:cdf462088d13	1860
markrad	0:cdf462088d13	1861	return( 0 );
markrad	0:cdf462088d13	1862	}
markrad	0:cdf462088d13	1863
markrad	0:cdf462088d13	1864	#if defined(MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED) \|\| \
markrad	0:cdf462088d13	1865	defined(MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED)
markrad	0:cdf462088d13	1866	static int ssl_parse_server_dh_params( mbedtls_ssl_context ssl, unsigned char *p,
markrad	0:cdf462088d13	1867	unsigned char *end )
markrad	0:cdf462088d13	1868	{
markrad	0:cdf462088d13	1869	int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE;
markrad	0:cdf462088d13	1870
markrad	0:cdf462088d13	1871	/*
markrad	0:cdf462088d13	1872	* Ephemeral DH parameters:
markrad	0:cdf462088d13	1873	*
markrad	0:cdf462088d13	1874	* struct {
markrad	0:cdf462088d13	1875	* opaque dh_p<1..2^16-1>;
markrad	0:cdf462088d13	1876	* opaque dh_g<1..2^16-1>;
markrad	0:cdf462088d13	1877	* opaque dh_Ys<1..2^16-1>;
markrad	0:cdf462088d13	1878	* } ServerDHParams;
markrad	0:cdf462088d13	1879	*/
markrad	0:cdf462088d13	1880	if( ( ret = mbedtls_dhm_read_params( &ssl->handshake->dhm_ctx, p, end ) ) != 0 )
markrad	0:cdf462088d13	1881	{
markrad	0:cdf462088d13	1882	MBEDTLS_SSL_DEBUG_RET( 2, ( "mbedtls_dhm_read_params" ), ret );
markrad	0:cdf462088d13	1883	return( ret );
markrad	0:cdf462088d13	1884	}
markrad	0:cdf462088d13	1885
markrad	0:cdf462088d13	1886	if( ssl->handshake->dhm_ctx.len * 8 < ssl->conf->dhm_min_bitlen )
markrad	0:cdf462088d13	1887	{
markrad	0:cdf462088d13	1888	MBEDTLS_SSL_DEBUG_MSG( 1, ( "DHM prime too short: %d < %d",
markrad	0:cdf462088d13	1889	ssl->handshake->dhm_ctx.len * 8,
markrad	0:cdf462088d13	1890	ssl->conf->dhm_min_bitlen ) );
markrad	0:cdf462088d13	1891	return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
markrad	0:cdf462088d13	1892	}
markrad	0:cdf462088d13	1893
markrad	0:cdf462088d13	1894	MBEDTLS_SSL_DEBUG_MPI( 3, "DHM: P ", &ssl->handshake->dhm_ctx.P );
markrad	0:cdf462088d13	1895	MBEDTLS_SSL_DEBUG_MPI( 3, "DHM: G ", &ssl->handshake->dhm_ctx.G );
markrad	0:cdf462088d13	1896	MBEDTLS_SSL_DEBUG_MPI( 3, "DHM: GY", &ssl->handshake->dhm_ctx.GY );
markrad	0:cdf462088d13	1897
markrad	0:cdf462088d13	1898	return( ret );
markrad	0:cdf462088d13	1899	}
markrad	0:cdf462088d13	1900	#endif /* MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED \|\|
markrad	0:cdf462088d13	1901	MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED */
markrad	0:cdf462088d13	1902
markrad	0:cdf462088d13	1903	#if defined(MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED) \|\| \
markrad	0:cdf462088d13	1904	defined(MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED) \|\| \
markrad	0:cdf462088d13	1905	defined(MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED) \|\| \
markrad	0:cdf462088d13	1906	defined(MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED) \|\| \
markrad	0:cdf462088d13	1907	defined(MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED)
markrad	0:cdf462088d13	1908	static int ssl_check_server_ecdh_params( const mbedtls_ssl_context *ssl )
markrad	0:cdf462088d13	1909	{
markrad	0:cdf462088d13	1910	const mbedtls_ecp_curve_info *curve_info;
markrad	0:cdf462088d13	1911
markrad	0:cdf462088d13	1912	curve_info = mbedtls_ecp_curve_info_from_grp_id( ssl->handshake->ecdh_ctx.grp.id );
markrad	0:cdf462088d13	1913	if( curve_info == NULL )
markrad	0:cdf462088d13	1914	{
markrad	0:cdf462088d13	1915	MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
markrad	0:cdf462088d13	1916	return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
markrad	0:cdf462088d13	1917	}
markrad	0:cdf462088d13	1918
markrad	0:cdf462088d13	1919	MBEDTLS_SSL_DEBUG_MSG( 2, ( "ECDH curve: %s", curve_info->name ) );
markrad	0:cdf462088d13	1920
markrad	0:cdf462088d13	1921	#if defined(MBEDTLS_ECP_C)
markrad	0:cdf462088d13	1922	if( mbedtls_ssl_check_curve( ssl, ssl->handshake->ecdh_ctx.grp.id ) != 0 )
markrad	0:cdf462088d13	1923	#else
markrad	0:cdf462088d13	1924	if( ssl->handshake->ecdh_ctx.grp.nbits < 163 \|\|
markrad	0:cdf462088d13	1925	ssl->handshake->ecdh_ctx.grp.nbits > 521 )
markrad	0:cdf462088d13	1926	#endif
markrad	0:cdf462088d13	1927	return( -1 );
markrad	0:cdf462088d13	1928
markrad	0:cdf462088d13	1929	MBEDTLS_SSL_DEBUG_ECP( 3, "ECDH: Qp", &ssl->handshake->ecdh_ctx.Qp );
markrad	0:cdf462088d13	1930
markrad	0:cdf462088d13	1931	return( 0 );
markrad	0:cdf462088d13	1932	}
markrad	0:cdf462088d13	1933	#endif /* MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED \|\|
markrad	0:cdf462088d13	1934	MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED \|\|
markrad	0:cdf462088d13	1935	MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED \|\|
markrad	0:cdf462088d13	1936	MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED \|\|
markrad	0:cdf462088d13	1937	MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED */
markrad	0:cdf462088d13	1938
markrad	0:cdf462088d13	1939	#if defined(MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED) \|\| \
markrad	0:cdf462088d13	1940	defined(MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED) \|\| \
markrad	0:cdf462088d13	1941	defined(MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED)
markrad	0:cdf462088d13	1942	static int ssl_parse_server_ecdh_params( mbedtls_ssl_context *ssl,
markrad	0:cdf462088d13	1943	unsigned char **p,
markrad	0:cdf462088d13	1944	unsigned char *end )
markrad	0:cdf462088d13	1945	{
markrad	0:cdf462088d13	1946	int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE;
markrad	0:cdf462088d13	1947
markrad	0:cdf462088d13	1948	/*
markrad	0:cdf462088d13	1949	* Ephemeral ECDH parameters:
markrad	0:cdf462088d13	1950	*
markrad	0:cdf462088d13	1951	* struct {
markrad	0:cdf462088d13	1952	* ECParameters curve_params;
markrad	0:cdf462088d13	1953	* ECPoint public;
markrad	0:cdf462088d13	1954	* } ServerECDHParams;
markrad	0:cdf462088d13	1955	*/
markrad	0:cdf462088d13	1956	if( ( ret = mbedtls_ecdh_read_params( &ssl->handshake->ecdh_ctx,
markrad	0:cdf462088d13	1957	(const unsigned char **) p, end ) ) != 0 )
markrad	0:cdf462088d13	1958	{
markrad	0:cdf462088d13	1959	MBEDTLS_SSL_DEBUG_RET( 1, ( "mbedtls_ecdh_read_params" ), ret );
markrad	0:cdf462088d13	1960	return( ret );
markrad	0:cdf462088d13	1961	}
markrad	0:cdf462088d13	1962
markrad	0:cdf462088d13	1963	if( ssl_check_server_ecdh_params( ssl ) != 0 )
markrad	0:cdf462088d13	1964	{
markrad	0:cdf462088d13	1965	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server key exchange message (ECDHE curve)" ) );
markrad	0:cdf462088d13	1966	return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
markrad	0:cdf462088d13	1967	}
markrad	0:cdf462088d13	1968
markrad	0:cdf462088d13	1969	return( ret );
markrad	0:cdf462088d13	1970	}
markrad	0:cdf462088d13	1971	#endif /* MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED \|\|
markrad	0:cdf462088d13	1972	MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED \|\|
markrad	0:cdf462088d13	1973	MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED */
markrad	0:cdf462088d13	1974
markrad	0:cdf462088d13	1975	#if defined(MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED)
markrad	0:cdf462088d13	1976	static int ssl_parse_server_psk_hint( mbedtls_ssl_context *ssl,
markrad	0:cdf462088d13	1977	unsigned char **p,
markrad	0:cdf462088d13	1978	unsigned char *end )
markrad	0:cdf462088d13	1979	{
markrad	0:cdf462088d13	1980	int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE;
markrad	0:cdf462088d13	1981	size_t len;
markrad	0:cdf462088d13	1982	((void) ssl);
markrad	0:cdf462088d13	1983
markrad	0:cdf462088d13	1984	/*
markrad	0:cdf462088d13	1985	* PSK parameters:
markrad	0:cdf462088d13	1986	*
markrad	0:cdf462088d13	1987	* opaque psk_identity_hint<0..2^16-1>;
markrad	0:cdf462088d13	1988	*/
markrad	0:cdf462088d13	1989	len = (p)[0] << 8 \| (p)[1];
markrad	0:cdf462088d13	1990	*p += 2;
markrad	0:cdf462088d13	1991
markrad	0:cdf462088d13	1992	if( (*p) + len > end )
markrad	0:cdf462088d13	1993	{
markrad	0:cdf462088d13	1994	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server key exchange message (psk_identity_hint length)" ) );
markrad	0:cdf462088d13	1995	return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
markrad	0:cdf462088d13	1996	}
markrad	0:cdf462088d13	1997
markrad	0:cdf462088d13	1998	/*
markrad	0:cdf462088d13	1999	* Note: we currently ignore the PKS identity hint, as we only allow one
markrad	0:cdf462088d13	2000	* PSK to be provisionned on the client. This could be changed later if
markrad	0:cdf462088d13	2001	* someone needs that feature.
markrad	0:cdf462088d13	2002	*/
markrad	0:cdf462088d13	2003	*p += len;
markrad	0:cdf462088d13	2004	ret = 0;
markrad	0:cdf462088d13	2005
markrad	0:cdf462088d13	2006	return( ret );
markrad	0:cdf462088d13	2007	}
markrad	0:cdf462088d13	2008	#endif /* MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED */
markrad	0:cdf462088d13	2009
markrad	0:cdf462088d13	2010	#if defined(MBEDTLS_KEY_EXCHANGE_RSA_ENABLED) \|\| \
markrad	0:cdf462088d13	2011	defined(MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED)
markrad	0:cdf462088d13	2012	/*
markrad	0:cdf462088d13	2013	* Generate a pre-master secret and encrypt it with the server's RSA key
markrad	0:cdf462088d13	2014	*/
markrad	0:cdf462088d13	2015	static int ssl_write_encrypted_pms( mbedtls_ssl_context *ssl,
markrad	0:cdf462088d13	2016	size_t offset, size_t *olen,
markrad	0:cdf462088d13	2017	size_t pms_offset )
markrad	0:cdf462088d13	2018	{
markrad	0:cdf462088d13	2019	int ret;
markrad	0:cdf462088d13	2020	size_t len_bytes = ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 ? 0 : 2;
markrad	0:cdf462088d13	2021	unsigned char *p = ssl->handshake->premaster + pms_offset;
markrad	0:cdf462088d13	2022
markrad	0:cdf462088d13	2023	if( offset + len_bytes > MBEDTLS_SSL_MAX_CONTENT_LEN )
markrad	0:cdf462088d13	2024	{
markrad	0:cdf462088d13	2025	MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small for encrypted pms" ) );
markrad	0:cdf462088d13	2026	return( MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL );
markrad	0:cdf462088d13	2027	}
markrad	0:cdf462088d13	2028
markrad	0:cdf462088d13	2029	/*
markrad	0:cdf462088d13	2030	* Generate (part of) the pre-master as
markrad	0:cdf462088d13	2031	* struct {
markrad	0:cdf462088d13	2032	* ProtocolVersion client_version;
markrad	0:cdf462088d13	2033	* opaque random[46];
markrad	0:cdf462088d13	2034	* } PreMasterSecret;
markrad	0:cdf462088d13	2035	*/
markrad	0:cdf462088d13	2036	mbedtls_ssl_write_version( ssl->conf->max_major_ver, ssl->conf->max_minor_ver,
markrad	0:cdf462088d13	2037	ssl->conf->transport, p );
markrad	0:cdf462088d13	2038
markrad	0:cdf462088d13	2039	if( ( ret = ssl->conf->f_rng( ssl->conf->p_rng, p + 2, 46 ) ) != 0 )
markrad	0:cdf462088d13	2040	{
markrad	0:cdf462088d13	2041	MBEDTLS_SSL_DEBUG_RET( 1, "f_rng", ret );
markrad	0:cdf462088d13	2042	return( ret );
markrad	0:cdf462088d13	2043	}
markrad	0:cdf462088d13	2044
markrad	0:cdf462088d13	2045	ssl->handshake->pmslen = 48;
markrad	0:cdf462088d13	2046
markrad	0:cdf462088d13	2047	if( ssl->session_negotiate->peer_cert == NULL )
markrad	0:cdf462088d13	2048	{
markrad	0:cdf462088d13	2049	MBEDTLS_SSL_DEBUG_MSG( 2, ( "certificate required" ) );
markrad	0:cdf462088d13	2050	return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE );
markrad	0:cdf462088d13	2051	}
markrad	0:cdf462088d13	2052
markrad	0:cdf462088d13	2053	/*
markrad	0:cdf462088d13	2054	* Now write it out, encrypted
markrad	0:cdf462088d13	2055	*/
markrad	0:cdf462088d13	2056	if( ! mbedtls_pk_can_do( &ssl->session_negotiate->peer_cert->pk,
markrad	0:cdf462088d13	2057	MBEDTLS_PK_RSA ) )
markrad	0:cdf462088d13	2058	{
markrad	0:cdf462088d13	2059	MBEDTLS_SSL_DEBUG_MSG( 1, ( "certificate key type mismatch" ) );
markrad	0:cdf462088d13	2060	return( MBEDTLS_ERR_SSL_PK_TYPE_MISMATCH );
markrad	0:cdf462088d13	2061	}
markrad	0:cdf462088d13	2062
markrad	0:cdf462088d13	2063	if( ( ret = mbedtls_pk_encrypt( &ssl->session_negotiate->peer_cert->pk,
markrad	0:cdf462088d13	2064	p, ssl->handshake->pmslen,
markrad	0:cdf462088d13	2065	ssl->out_msg + offset + len_bytes, olen,
markrad	0:cdf462088d13	2066	MBEDTLS_SSL_MAX_CONTENT_LEN - offset - len_bytes,
markrad	0:cdf462088d13	2067	ssl->conf->f_rng, ssl->conf->p_rng ) ) != 0 )
markrad	0:cdf462088d13	2068	{
markrad	0:cdf462088d13	2069	MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_rsa_pkcs1_encrypt", ret );
markrad	0:cdf462088d13	2070	return( ret );
markrad	0:cdf462088d13	2071	}
markrad	0:cdf462088d13	2072
markrad	0:cdf462088d13	2073	#if defined(MBEDTLS_SSL_PROTO_TLS1) \|\| defined(MBEDTLS_SSL_PROTO_TLS1_1) \|\| \
markrad	0:cdf462088d13	2074	defined(MBEDTLS_SSL_PROTO_TLS1_2)
markrad	0:cdf462088d13	2075	if( len_bytes == 2 )
markrad	0:cdf462088d13	2076	{
markrad	0:cdf462088d13	2077	ssl->out_msg[offset+0] = (unsigned char)( *olen >> 8 );
markrad	0:cdf462088d13	2078	ssl->out_msg[offset+1] = (unsigned char)( *olen );
markrad	0:cdf462088d13	2079	*olen += 2;
markrad	0:cdf462088d13	2080	}
markrad	0:cdf462088d13	2081	#endif
markrad	0:cdf462088d13	2082
markrad	0:cdf462088d13	2083	return( 0 );
markrad	0:cdf462088d13	2084	}
markrad	0:cdf462088d13	2085	#endif /* MBEDTLS_KEY_EXCHANGE_RSA_ENABLED \|\|
markrad	0:cdf462088d13	2086	MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED */
markrad	0:cdf462088d13	2087
markrad	0:cdf462088d13	2088	#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
markrad	0:cdf462088d13	2089	#if defined(MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED) \|\| \
markrad	0:cdf462088d13	2090	defined(MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED) \|\| \
markrad	0:cdf462088d13	2091	defined(MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED)
markrad	0:cdf462088d13	2092	static int ssl_parse_signature_algorithm( mbedtls_ssl_context *ssl,
markrad	0:cdf462088d13	2093	unsigned char **p,
markrad	0:cdf462088d13	2094	unsigned char *end,
markrad	0:cdf462088d13	2095	mbedtls_md_type_t *md_alg,
markrad	0:cdf462088d13	2096	mbedtls_pk_type_t *pk_alg )
markrad	0:cdf462088d13	2097	{
markrad	0:cdf462088d13	2098	((void) ssl);
markrad	0:cdf462088d13	2099	*md_alg = MBEDTLS_MD_NONE;
markrad	0:cdf462088d13	2100	*pk_alg = MBEDTLS_PK_NONE;
markrad	0:cdf462088d13	2101
markrad	0:cdf462088d13	2102	/* Only in TLS 1.2 */
markrad	0:cdf462088d13	2103	if( ssl->minor_ver != MBEDTLS_SSL_MINOR_VERSION_3 )
markrad	0:cdf462088d13	2104	{
markrad	0:cdf462088d13	2105	return( 0 );
markrad	0:cdf462088d13	2106	}
markrad	0:cdf462088d13	2107
markrad	0:cdf462088d13	2108	if( (*p) + 2 > end )
markrad	0:cdf462088d13	2109	return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
markrad	0:cdf462088d13	2110
markrad	0:cdf462088d13	2111	/*
markrad	0:cdf462088d13	2112	* Get hash algorithm
markrad	0:cdf462088d13	2113	*/
markrad	0:cdf462088d13	2114	if( ( md_alg = mbedtls_ssl_md_alg_from_hash( (p)[0] ) ) == MBEDTLS_MD_NONE )
markrad	0:cdf462088d13	2115	{
markrad	0:cdf462088d13	2116	MBEDTLS_SSL_DEBUG_MSG( 1, ( "Server used unsupported "
markrad	0:cdf462088d13	2117	"HashAlgorithm %d", *(p)[0] ) );
markrad	0:cdf462088d13	2118	return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
markrad	0:cdf462088d13	2119	}
markrad	0:cdf462088d13	2120
markrad	0:cdf462088d13	2121	/*
markrad	0:cdf462088d13	2122	* Get signature algorithm
markrad	0:cdf462088d13	2123	*/
markrad	0:cdf462088d13	2124	if( ( pk_alg = mbedtls_ssl_pk_alg_from_sig( (p)[1] ) ) == MBEDTLS_PK_NONE )
markrad	0:cdf462088d13	2125	{
markrad	0:cdf462088d13	2126	MBEDTLS_SSL_DEBUG_MSG( 1, ( "server used unsupported "
markrad	0:cdf462088d13	2127	"SignatureAlgorithm %d", (*p)[1] ) );
markrad	0:cdf462088d13	2128	return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
markrad	0:cdf462088d13	2129	}
markrad	0:cdf462088d13	2130
markrad	0:cdf462088d13	2131	/*
markrad	0:cdf462088d13	2132	* Check if the hash is acceptable
markrad	0:cdf462088d13	2133	*/
markrad	0:cdf462088d13	2134	if( mbedtls_ssl_check_sig_hash( ssl, *md_alg ) != 0 )
markrad	0:cdf462088d13	2135	{
markrad	0:cdf462088d13	2136	MBEDTLS_SSL_DEBUG_MSG( 1, ( "server used HashAlgorithm "
markrad	0:cdf462088d13	2137	"that was not offered" ) );
markrad	0:cdf462088d13	2138	return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
markrad	0:cdf462088d13	2139	}
markrad	0:cdf462088d13	2140
markrad	0:cdf462088d13	2141	MBEDTLS_SSL_DEBUG_MSG( 2, ( "Server used SignatureAlgorithm %d", (*p)[1] ) );
markrad	0:cdf462088d13	2142	MBEDTLS_SSL_DEBUG_MSG( 2, ( "Server used HashAlgorithm %d", (*p)[0] ) );
markrad	0:cdf462088d13	2143	*p += 2;
markrad	0:cdf462088d13	2144
markrad	0:cdf462088d13	2145	return( 0 );
markrad	0:cdf462088d13	2146	}
markrad	0:cdf462088d13	2147	#endif /* MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED \|\|
markrad	0:cdf462088d13	2148	MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED \|\|
markrad	0:cdf462088d13	2149	MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED */
markrad	0:cdf462088d13	2150	#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
markrad	0:cdf462088d13	2151
markrad	0:cdf462088d13	2152	#if defined(MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED) \|\| \
markrad	0:cdf462088d13	2153	defined(MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED)
markrad	0:cdf462088d13	2154	static int ssl_get_ecdh_params_from_cert( mbedtls_ssl_context *ssl )
markrad	0:cdf462088d13	2155	{
markrad	0:cdf462088d13	2156	int ret;
markrad	0:cdf462088d13	2157	const mbedtls_ecp_keypair *peer_key;
markrad	0:cdf462088d13	2158
markrad	0:cdf462088d13	2159	if( ssl->session_negotiate->peer_cert == NULL )
markrad	0:cdf462088d13	2160	{
markrad	0:cdf462088d13	2161	MBEDTLS_SSL_DEBUG_MSG( 2, ( "certificate required" ) );
markrad	0:cdf462088d13	2162	return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE );
markrad	0:cdf462088d13	2163	}
markrad	0:cdf462088d13	2164
markrad	0:cdf462088d13	2165	if( ! mbedtls_pk_can_do( &ssl->session_negotiate->peer_cert->pk,
markrad	0:cdf462088d13	2166	MBEDTLS_PK_ECKEY ) )
markrad	0:cdf462088d13	2167	{
markrad	0:cdf462088d13	2168	MBEDTLS_SSL_DEBUG_MSG( 1, ( "server key not ECDH capable" ) );
markrad	0:cdf462088d13	2169	return( MBEDTLS_ERR_SSL_PK_TYPE_MISMATCH );
markrad	0:cdf462088d13	2170	}
markrad	0:cdf462088d13	2171
markrad	0:cdf462088d13	2172	peer_key = mbedtls_pk_ec( ssl->session_negotiate->peer_cert->pk );
markrad	0:cdf462088d13	2173
markrad	0:cdf462088d13	2174	if( ( ret = mbedtls_ecdh_get_params( &ssl->handshake->ecdh_ctx, peer_key,
markrad	0:cdf462088d13	2175	MBEDTLS_ECDH_THEIRS ) ) != 0 )
markrad	0:cdf462088d13	2176	{
markrad	0:cdf462088d13	2177	MBEDTLS_SSL_DEBUG_RET( 1, ( "mbedtls_ecdh_get_params" ), ret );
markrad	0:cdf462088d13	2178	return( ret );
markrad	0:cdf462088d13	2179	}
markrad	0:cdf462088d13	2180
markrad	0:cdf462088d13	2181	if( ssl_check_server_ecdh_params( ssl ) != 0 )
markrad	0:cdf462088d13	2182	{
markrad	0:cdf462088d13	2183	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server certificate (ECDH curve)" ) );
markrad	0:cdf462088d13	2184	return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE );
markrad	0:cdf462088d13	2185	}
markrad	0:cdf462088d13	2186
markrad	0:cdf462088d13	2187	return( ret );
markrad	0:cdf462088d13	2188	}
markrad	0:cdf462088d13	2189	#endif /* MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED) \|\|
markrad	0:cdf462088d13	2190	MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED */
markrad	0:cdf462088d13	2191
markrad	0:cdf462088d13	2192	static int ssl_parse_server_key_exchange( mbedtls_ssl_context *ssl )
markrad	0:cdf462088d13	2193	{
markrad	0:cdf462088d13	2194	int ret;
markrad	0:cdf462088d13	2195	const mbedtls_ssl_ciphersuite_t *ciphersuite_info = ssl->transform_negotiate->ciphersuite_info;
markrad	0:cdf462088d13	2196	unsigned char p, end;
markrad	0:cdf462088d13	2197
markrad	0:cdf462088d13	2198	MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse server key exchange" ) );
markrad	0:cdf462088d13	2199
markrad	0:cdf462088d13	2200	#if defined(MBEDTLS_KEY_EXCHANGE_RSA_ENABLED)
markrad	0:cdf462088d13	2201	if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA )
markrad	0:cdf462088d13	2202	{
markrad	0:cdf462088d13	2203	MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip parse server key exchange" ) );
markrad	0:cdf462088d13	2204	ssl->state++;
markrad	0:cdf462088d13	2205	return( 0 );
markrad	0:cdf462088d13	2206	}
markrad	0:cdf462088d13	2207	((void) p);
markrad	0:cdf462088d13	2208	((void) end);
markrad	0:cdf462088d13	2209	#endif
markrad	0:cdf462088d13	2210
markrad	0:cdf462088d13	2211	#if defined(MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED) \|\| \
markrad	0:cdf462088d13	2212	defined(MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED)
markrad	0:cdf462088d13	2213	if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDH_RSA \|\|
markrad	0:cdf462088d13	2214	ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA )
markrad	0:cdf462088d13	2215	{
markrad	0:cdf462088d13	2216	if( ( ret = ssl_get_ecdh_params_from_cert( ssl ) ) != 0 )
markrad	0:cdf462088d13	2217	{
markrad	0:cdf462088d13	2218	MBEDTLS_SSL_DEBUG_RET( 1, "ssl_get_ecdh_params_from_cert", ret );
markrad	0:cdf462088d13	2219	return( ret );
markrad	0:cdf462088d13	2220	}
markrad	0:cdf462088d13	2221
markrad	0:cdf462088d13	2222	MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip parse server key exchange" ) );
markrad	0:cdf462088d13	2223	ssl->state++;
markrad	0:cdf462088d13	2224	return( 0 );
markrad	0:cdf462088d13	2225	}
markrad	0:cdf462088d13	2226	((void) p);
markrad	0:cdf462088d13	2227	((void) end);
markrad	0:cdf462088d13	2228	#endif /* MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED \|\|
markrad	0:cdf462088d13	2229	MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED */
markrad	0:cdf462088d13	2230
markrad	0:cdf462088d13	2231	if( ( ret = mbedtls_ssl_read_record( ssl ) ) != 0 )
markrad	0:cdf462088d13	2232	{
markrad	0:cdf462088d13	2233	MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_read_record", ret );
markrad	0:cdf462088d13	2234	return( ret );
markrad	0:cdf462088d13	2235	}
markrad	0:cdf462088d13	2236
markrad	0:cdf462088d13	2237	if( ssl->in_msgtype != MBEDTLS_SSL_MSG_HANDSHAKE )
markrad	0:cdf462088d13	2238	{
markrad	0:cdf462088d13	2239	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server key exchange message" ) );
markrad	0:cdf462088d13	2240	return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE );
markrad	0:cdf462088d13	2241	}
markrad	0:cdf462088d13	2242
markrad	0:cdf462088d13	2243	/*
markrad	0:cdf462088d13	2244	* ServerKeyExchange may be skipped with PSK and RSA-PSK when the server
markrad	0:cdf462088d13	2245	* doesn't use a psk_identity_hint
markrad	0:cdf462088d13	2246	*/
markrad	0:cdf462088d13	2247	if( ssl->in_msg[0] != MBEDTLS_SSL_HS_SERVER_KEY_EXCHANGE )
markrad	0:cdf462088d13	2248	{
markrad	0:cdf462088d13	2249	if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_PSK \|\|
markrad	0:cdf462088d13	2250	ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA_PSK )
markrad	0:cdf462088d13	2251	{
markrad	0:cdf462088d13	2252	ssl->record_read = 1;
markrad	0:cdf462088d13	2253	goto exit;
markrad	0:cdf462088d13	2254	}
markrad	0:cdf462088d13	2255
markrad	0:cdf462088d13	2256	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server key exchange message" ) );
markrad	0:cdf462088d13	2257	return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE );
markrad	0:cdf462088d13	2258	}
markrad	0:cdf462088d13	2259
markrad	0:cdf462088d13	2260	p = ssl->in_msg + mbedtls_ssl_hs_hdr_len( ssl );
markrad	0:cdf462088d13	2261	end = ssl->in_msg + ssl->in_hslen;
markrad	0:cdf462088d13	2262	MBEDTLS_SSL_DEBUG_BUF( 3, "server key exchange", p, end - p );
markrad	0:cdf462088d13	2263
markrad	0:cdf462088d13	2264	#if defined(MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED)
markrad	0:cdf462088d13	2265	if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_PSK \|\|
markrad	0:cdf462088d13	2266	ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA_PSK \|\|
markrad	0:cdf462088d13	2267	ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_PSK \|\|
markrad	0:cdf462088d13	2268	ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_PSK )
markrad	0:cdf462088d13	2269	{
markrad	0:cdf462088d13	2270	if( ssl_parse_server_psk_hint( ssl, &p, end ) != 0 )
markrad	0:cdf462088d13	2271	{
markrad	0:cdf462088d13	2272	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server key exchange message" ) );
markrad	0:cdf462088d13	2273	return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
markrad	0:cdf462088d13	2274	}
markrad	0:cdf462088d13	2275	} /* FALLTROUGH */
markrad	0:cdf462088d13	2276	#endif /* MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED */
markrad	0:cdf462088d13	2277
markrad	0:cdf462088d13	2278	#if defined(MBEDTLS_KEY_EXCHANGE_PSK_ENABLED) \|\| \
markrad	0:cdf462088d13	2279	defined(MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED)
markrad	0:cdf462088d13	2280	if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_PSK \|\|
markrad	0:cdf462088d13	2281	ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA_PSK )
markrad	0:cdf462088d13	2282	; /* nothing more to do */
markrad	0:cdf462088d13	2283	else
markrad	0:cdf462088d13	2284	#endif /* MBEDTLS_KEY_EXCHANGE_PSK_ENABLED \|\|
markrad	0:cdf462088d13	2285	MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED */
markrad	0:cdf462088d13	2286	#if defined(MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED) \|\| \
markrad	0:cdf462088d13	2287	defined(MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED)
markrad	0:cdf462088d13	2288	if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_RSA \|\|
markrad	0:cdf462088d13	2289	ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_PSK )
markrad	0:cdf462088d13	2290	{
markrad	0:cdf462088d13	2291	if( ssl_parse_server_dh_params( ssl, &p, end ) != 0 )
markrad	0:cdf462088d13	2292	{
markrad	0:cdf462088d13	2293	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server key exchange message" ) );
markrad	0:cdf462088d13	2294	return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
markrad	0:cdf462088d13	2295	}
markrad	0:cdf462088d13	2296	}
markrad	0:cdf462088d13	2297	else
markrad	0:cdf462088d13	2298	#endif /* MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED \|\|
markrad	0:cdf462088d13	2299	MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED */
markrad	0:cdf462088d13	2300	#if defined(MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED) \|\| \
markrad	0:cdf462088d13	2301	defined(MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED) \|\| \
markrad	0:cdf462088d13	2302	defined(MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED)
markrad	0:cdf462088d13	2303	if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_RSA \|\|
markrad	0:cdf462088d13	2304	ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_PSK \|\|
markrad	0:cdf462088d13	2305	ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA )
markrad	0:cdf462088d13	2306	{
markrad	0:cdf462088d13	2307	if( ssl_parse_server_ecdh_params( ssl, &p, end ) != 0 )
markrad	0:cdf462088d13	2308	{
markrad	0:cdf462088d13	2309	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server key exchange message" ) );
markrad	0:cdf462088d13	2310	return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
markrad	0:cdf462088d13	2311	}
markrad	0:cdf462088d13	2312	}
markrad	0:cdf462088d13	2313	else
markrad	0:cdf462088d13	2314	#endif /* MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED \|\|
markrad	0:cdf462088d13	2315	MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED \|\|
markrad	0:cdf462088d13	2316	MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED */
markrad	0:cdf462088d13	2317	#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
markrad	0:cdf462088d13	2318	if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECJPAKE )
markrad	0:cdf462088d13	2319	{
markrad	0:cdf462088d13	2320	ret = mbedtls_ecjpake_read_round_two( &ssl->handshake->ecjpake_ctx,
markrad	0:cdf462088d13	2321	p, end - p );
markrad	0:cdf462088d13	2322	if( ret != 0 )
markrad	0:cdf462088d13	2323	{
markrad	0:cdf462088d13	2324	MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecjpake_read_round_two", ret );
markrad	0:cdf462088d13	2325	return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
markrad	0:cdf462088d13	2326	}
markrad	0:cdf462088d13	2327	}
markrad	0:cdf462088d13	2328	else
markrad	0:cdf462088d13	2329	#endif /* MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */
markrad	0:cdf462088d13	2330	{
markrad	0:cdf462088d13	2331	MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
markrad	0:cdf462088d13	2332	return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
markrad	0:cdf462088d13	2333	}
markrad	0:cdf462088d13	2334
markrad	0:cdf462088d13	2335	#if defined(MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED) \|\| \
markrad	0:cdf462088d13	2336	defined(MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED) \|\| \
markrad	0:cdf462088d13	2337	defined(MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED)
markrad	0:cdf462088d13	2338	if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_RSA \|\|
markrad	0:cdf462088d13	2339	ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_RSA \|\|
markrad	0:cdf462088d13	2340	ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA )
markrad	0:cdf462088d13	2341	{
markrad	0:cdf462088d13	2342	size_t sig_len, hashlen;
markrad	0:cdf462088d13	2343	unsigned char hash[64];
markrad	0:cdf462088d13	2344	mbedtls_md_type_t md_alg = MBEDTLS_MD_NONE;
markrad	0:cdf462088d13	2345	mbedtls_pk_type_t pk_alg = MBEDTLS_PK_NONE;
markrad	0:cdf462088d13	2346	unsigned char *params = ssl->in_msg + mbedtls_ssl_hs_hdr_len( ssl );
markrad	0:cdf462088d13	2347	size_t params_len = p - params;
markrad	0:cdf462088d13	2348
markrad	0:cdf462088d13	2349	/*
markrad	0:cdf462088d13	2350	* Handle the digitally-signed structure
markrad	0:cdf462088d13	2351	*/
markrad	0:cdf462088d13	2352	#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
markrad	0:cdf462088d13	2353	if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 )
markrad	0:cdf462088d13	2354	{
markrad	0:cdf462088d13	2355	if( ssl_parse_signature_algorithm( ssl, &p, end,
markrad	0:cdf462088d13	2356	&md_alg, &pk_alg ) != 0 )
markrad	0:cdf462088d13	2357	{
markrad	0:cdf462088d13	2358	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server key exchange message" ) );
markrad	0:cdf462088d13	2359	return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
markrad	0:cdf462088d13	2360	}
markrad	0:cdf462088d13	2361
markrad	0:cdf462088d13	2362	if( pk_alg != mbedtls_ssl_get_ciphersuite_sig_pk_alg( ciphersuite_info ) )
markrad	0:cdf462088d13	2363	{
markrad	0:cdf462088d13	2364	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server key exchange message" ) );
markrad	0:cdf462088d13	2365	return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
markrad	0:cdf462088d13	2366	}
markrad	0:cdf462088d13	2367	}
markrad	0:cdf462088d13	2368	else
markrad	0:cdf462088d13	2369	#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
markrad	0:cdf462088d13	2370	#if defined(MBEDTLS_SSL_PROTO_SSL3) \|\| defined(MBEDTLS_SSL_PROTO_TLS1) \|\| \
markrad	0:cdf462088d13	2371	defined(MBEDTLS_SSL_PROTO_TLS1_1)
markrad	0:cdf462088d13	2372	if( ssl->minor_ver < MBEDTLS_SSL_MINOR_VERSION_3 )
markrad	0:cdf462088d13	2373	{
markrad	0:cdf462088d13	2374	pk_alg = mbedtls_ssl_get_ciphersuite_sig_pk_alg( ciphersuite_info );
markrad	0:cdf462088d13	2375
markrad	0:cdf462088d13	2376	/* Default hash for ECDSA is SHA-1 */
markrad	0:cdf462088d13	2377	if( pk_alg == MBEDTLS_PK_ECDSA && md_alg == MBEDTLS_MD_NONE )
markrad	0:cdf462088d13	2378	md_alg = MBEDTLS_MD_SHA1;
markrad	0:cdf462088d13	2379	}
markrad	0:cdf462088d13	2380	else
markrad	0:cdf462088d13	2381	#endif
markrad	0:cdf462088d13	2382	{
markrad	0:cdf462088d13	2383	MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
markrad	0:cdf462088d13	2384	return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
markrad	0:cdf462088d13	2385	}
markrad	0:cdf462088d13	2386
markrad	0:cdf462088d13	2387	/*
markrad	0:cdf462088d13	2388	* Read signature
markrad	0:cdf462088d13	2389	*/
markrad	0:cdf462088d13	2390	sig_len = ( p[0] << 8 ) \| p[1];
markrad	0:cdf462088d13	2391	p += 2;
markrad	0:cdf462088d13	2392
markrad	0:cdf462088d13	2393	if( end != p + sig_len )
markrad	0:cdf462088d13	2394	{
markrad	0:cdf462088d13	2395	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server key exchange message" ) );
markrad	0:cdf462088d13	2396	return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
markrad	0:cdf462088d13	2397	}
markrad	0:cdf462088d13	2398
markrad	0:cdf462088d13	2399	MBEDTLS_SSL_DEBUG_BUF( 3, "signature", p, sig_len );
markrad	0:cdf462088d13	2400
markrad	0:cdf462088d13	2401	/*
markrad	0:cdf462088d13	2402	* Compute the hash that has been signed
markrad	0:cdf462088d13	2403	*/
markrad	0:cdf462088d13	2404	#if defined(MBEDTLS_SSL_PROTO_SSL3) \|\| defined(MBEDTLS_SSL_PROTO_TLS1) \|\| \
markrad	0:cdf462088d13	2405	defined(MBEDTLS_SSL_PROTO_TLS1_1)
markrad	0:cdf462088d13	2406	if( md_alg == MBEDTLS_MD_NONE )
markrad	0:cdf462088d13	2407	{
markrad	0:cdf462088d13	2408	mbedtls_md5_context mbedtls_md5;
markrad	0:cdf462088d13	2409	mbedtls_sha1_context mbedtls_sha1;
markrad	0:cdf462088d13	2410
markrad	0:cdf462088d13	2411	mbedtls_md5_init( &mbedtls_md5 );
markrad	0:cdf462088d13	2412	mbedtls_sha1_init( &mbedtls_sha1 );
markrad	0:cdf462088d13	2413
markrad	0:cdf462088d13	2414	hashlen = 36;
markrad	0:cdf462088d13	2415
markrad	0:cdf462088d13	2416	/*
markrad	0:cdf462088d13	2417	* digitally-signed struct {
markrad	0:cdf462088d13	2418	* opaque md5_hash[16];
markrad	0:cdf462088d13	2419	* opaque sha_hash[20];
markrad	0:cdf462088d13	2420	* };
markrad	0:cdf462088d13	2421	*
markrad	0:cdf462088d13	2422	* md5_hash
markrad	0:cdf462088d13	2423	* MD5(ClientHello.random + ServerHello.random
markrad	0:cdf462088d13	2424	* + ServerParams);
markrad	0:cdf462088d13	2425	* sha_hash
markrad	0:cdf462088d13	2426	* SHA(ClientHello.random + ServerHello.random
markrad	0:cdf462088d13	2427	* + ServerParams);
markrad	0:cdf462088d13	2428	*/
markrad	0:cdf462088d13	2429	mbedtls_md5_starts( &mbedtls_md5 );
markrad	0:cdf462088d13	2430	mbedtls_md5_update( &mbedtls_md5, ssl->handshake->randbytes, 64 );
markrad	0:cdf462088d13	2431	mbedtls_md5_update( &mbedtls_md5, params, params_len );
markrad	0:cdf462088d13	2432	mbedtls_md5_finish( &mbedtls_md5, hash );
markrad	0:cdf462088d13	2433
markrad	0:cdf462088d13	2434	mbedtls_sha1_starts( &mbedtls_sha1 );
markrad	0:cdf462088d13	2435	mbedtls_sha1_update( &mbedtls_sha1, ssl->handshake->randbytes, 64 );
markrad	0:cdf462088d13	2436	mbedtls_sha1_update( &mbedtls_sha1, params, params_len );
markrad	0:cdf462088d13	2437	mbedtls_sha1_finish( &mbedtls_sha1, hash + 16 );
markrad	0:cdf462088d13	2438
markrad	0:cdf462088d13	2439	mbedtls_md5_free( &mbedtls_md5 );
markrad	0:cdf462088d13	2440	mbedtls_sha1_free( &mbedtls_sha1 );
markrad	0:cdf462088d13	2441	}
markrad	0:cdf462088d13	2442	else
markrad	0:cdf462088d13	2443	#endif /* MBEDTLS_SSL_PROTO_SSL3 \|\| MBEDTLS_SSL_PROTO_TLS1 \|\| \
markrad	0:cdf462088d13	2444	MBEDTLS_SSL_PROTO_TLS1_1 */
markrad	0:cdf462088d13	2445	#if defined(MBEDTLS_SSL_PROTO_TLS1) \|\| defined(MBEDTLS_SSL_PROTO_TLS1_1) \|\| \
markrad	0:cdf462088d13	2446	defined(MBEDTLS_SSL_PROTO_TLS1_2)
markrad	0:cdf462088d13	2447	if( md_alg != MBEDTLS_MD_NONE )
markrad	0:cdf462088d13	2448	{
markrad	0:cdf462088d13	2449	mbedtls_md_context_t ctx;
markrad	0:cdf462088d13	2450
markrad	0:cdf462088d13	2451	mbedtls_md_init( &ctx );
markrad	0:cdf462088d13	2452
markrad	0:cdf462088d13	2453	/* Info from md_alg will be used instead */
markrad	0:cdf462088d13	2454	hashlen = 0;
markrad	0:cdf462088d13	2455
markrad	0:cdf462088d13	2456	/*
markrad	0:cdf462088d13	2457	* digitally-signed struct {
markrad	0:cdf462088d13	2458	* opaque client_random[32];
markrad	0:cdf462088d13	2459	* opaque server_random[32];
markrad	0:cdf462088d13	2460	* ServerDHParams params;
markrad	0:cdf462088d13	2461	* };
markrad	0:cdf462088d13	2462	*/
markrad	0:cdf462088d13	2463	if( ( ret = mbedtls_md_setup( &ctx,
markrad	0:cdf462088d13	2464	mbedtls_md_info_from_type( md_alg ), 0 ) ) != 0 )
markrad	0:cdf462088d13	2465	{
markrad	0:cdf462088d13	2466	MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_md_setup", ret );
markrad	0:cdf462088d13	2467	return( ret );
markrad	0:cdf462088d13	2468	}
markrad	0:cdf462088d13	2469
markrad	0:cdf462088d13	2470	mbedtls_md_starts( &ctx );
markrad	0:cdf462088d13	2471	mbedtls_md_update( &ctx, ssl->handshake->randbytes, 64 );
markrad	0:cdf462088d13	2472	mbedtls_md_update( &ctx, params, params_len );
markrad	0:cdf462088d13	2473	mbedtls_md_finish( &ctx, hash );
markrad	0:cdf462088d13	2474	mbedtls_md_free( &ctx );
markrad	0:cdf462088d13	2475	}
markrad	0:cdf462088d13	2476	else
markrad	0:cdf462088d13	2477	#endif /* MBEDTLS_SSL_PROTO_TLS1 \|\| MBEDTLS_SSL_PROTO_TLS1_1 \|\| \
markrad	0:cdf462088d13	2478	MBEDTLS_SSL_PROTO_TLS1_2 */
markrad	0:cdf462088d13	2479	{
markrad	0:cdf462088d13	2480	MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
markrad	0:cdf462088d13	2481	return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
markrad	0:cdf462088d13	2482	}
markrad	0:cdf462088d13	2483
markrad	0:cdf462088d13	2484	MBEDTLS_SSL_DEBUG_BUF( 3, "parameters hash", hash, hashlen != 0 ? hashlen :
markrad	0:cdf462088d13	2485	(unsigned int) ( mbedtls_md_get_size( mbedtls_md_info_from_type( md_alg ) ) ) );
markrad	0:cdf462088d13	2486
markrad	0:cdf462088d13	2487	if( ssl->session_negotiate->peer_cert == NULL )
markrad	0:cdf462088d13	2488	{
markrad	0:cdf462088d13	2489	MBEDTLS_SSL_DEBUG_MSG( 2, ( "certificate required" ) );
markrad	0:cdf462088d13	2490	return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE );
markrad	0:cdf462088d13	2491	}
markrad	0:cdf462088d13	2492
markrad	0:cdf462088d13	2493	/*
markrad	0:cdf462088d13	2494	* Verify signature
markrad	0:cdf462088d13	2495	*/
markrad	0:cdf462088d13	2496	if( ! mbedtls_pk_can_do( &ssl->session_negotiate->peer_cert->pk, pk_alg ) )
markrad	0:cdf462088d13	2497	{
markrad	0:cdf462088d13	2498	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server key exchange message" ) );
markrad	0:cdf462088d13	2499	return( MBEDTLS_ERR_SSL_PK_TYPE_MISMATCH );
markrad	0:cdf462088d13	2500	}
markrad	0:cdf462088d13	2501
markrad	0:cdf462088d13	2502	if( ( ret = mbedtls_pk_verify( &ssl->session_negotiate->peer_cert->pk,
markrad	0:cdf462088d13	2503	md_alg, hash, hashlen, p, sig_len ) ) != 0 )
markrad	0:cdf462088d13	2504	{
markrad	0:cdf462088d13	2505	MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_pk_verify", ret );
markrad	0:cdf462088d13	2506	return( ret );
markrad	0:cdf462088d13	2507	}
markrad	0:cdf462088d13	2508	}
markrad	0:cdf462088d13	2509	#endif /* MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED \|\|
markrad	0:cdf462088d13	2510	MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED \|\|
markrad	0:cdf462088d13	2511	MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED */
markrad	0:cdf462088d13	2512
markrad	0:cdf462088d13	2513	exit:
markrad	0:cdf462088d13	2514	ssl->state++;
markrad	0:cdf462088d13	2515
markrad	0:cdf462088d13	2516	MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse server key exchange" ) );
markrad	0:cdf462088d13	2517
markrad	0:cdf462088d13	2518	return( 0 );
markrad	0:cdf462088d13	2519	}
markrad	0:cdf462088d13	2520
markrad	0:cdf462088d13	2521	#if !defined(MBEDTLS_KEY_EXCHANGE_RSA_ENABLED) && \
markrad	0:cdf462088d13	2522	!defined(MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED) && \
markrad	0:cdf462088d13	2523	!defined(MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED) && \
markrad	0:cdf462088d13	2524	!defined(MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED) && \
markrad	0:cdf462088d13	2525	!defined(MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED)&& \
markrad	0:cdf462088d13	2526	!defined(MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED)
markrad	0:cdf462088d13	2527	static int ssl_parse_certificate_request( mbedtls_ssl_context *ssl )
markrad	0:cdf462088d13	2528	{
markrad	0:cdf462088d13	2529	const mbedtls_ssl_ciphersuite_t *ciphersuite_info = ssl->transform_negotiate->ciphersuite_info;
markrad	0:cdf462088d13	2530
markrad	0:cdf462088d13	2531	MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse certificate request" ) );
markrad	0:cdf462088d13	2532
markrad	0:cdf462088d13	2533	if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_PSK \|\|
markrad	0:cdf462088d13	2534	ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA_PSK \|\|
markrad	0:cdf462088d13	2535	ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_PSK \|\|
markrad	0:cdf462088d13	2536	ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_PSK \|\|
markrad	0:cdf462088d13	2537	ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECJPAKE )
markrad	0:cdf462088d13	2538	{
markrad	0:cdf462088d13	2539	MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip parse certificate request" ) );
markrad	0:cdf462088d13	2540	ssl->state++;
markrad	0:cdf462088d13	2541	return( 0 );
markrad	0:cdf462088d13	2542	}
markrad	0:cdf462088d13	2543
markrad	0:cdf462088d13	2544	MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
markrad	0:cdf462088d13	2545	return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
markrad	0:cdf462088d13	2546	}
markrad	0:cdf462088d13	2547	#else
markrad	0:cdf462088d13	2548	static int ssl_parse_certificate_request( mbedtls_ssl_context *ssl )
markrad	0:cdf462088d13	2549	{
markrad	0:cdf462088d13	2550	int ret;
markrad	0:cdf462088d13	2551	unsigned char *buf;
markrad	0:cdf462088d13	2552	size_t n = 0;
markrad	0:cdf462088d13	2553	size_t cert_type_len = 0, dn_len = 0;
markrad	0:cdf462088d13	2554	const mbedtls_ssl_ciphersuite_t *ciphersuite_info = ssl->transform_negotiate->ciphersuite_info;
markrad	0:cdf462088d13	2555
markrad	0:cdf462088d13	2556	MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse certificate request" ) );
markrad	0:cdf462088d13	2557
markrad	0:cdf462088d13	2558	if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_PSK \|\|
markrad	0:cdf462088d13	2559	ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA_PSK \|\|
markrad	0:cdf462088d13	2560	ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_PSK \|\|
markrad	0:cdf462088d13	2561	ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_PSK \|\|
markrad	0:cdf462088d13	2562	ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECJPAKE )
markrad	0:cdf462088d13	2563	{
markrad	0:cdf462088d13	2564	MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip parse certificate request" ) );
markrad	0:cdf462088d13	2565	ssl->state++;
markrad	0:cdf462088d13	2566	return( 0 );
markrad	0:cdf462088d13	2567	}
markrad	0:cdf462088d13	2568
markrad	0:cdf462088d13	2569	if( ssl->record_read == 0 )
markrad	0:cdf462088d13	2570	{
markrad	0:cdf462088d13	2571	if( ( ret = mbedtls_ssl_read_record( ssl ) ) != 0 )
markrad	0:cdf462088d13	2572	{
markrad	0:cdf462088d13	2573	MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_read_record", ret );
markrad	0:cdf462088d13	2574	return( ret );
markrad	0:cdf462088d13	2575	}
markrad	0:cdf462088d13	2576
markrad	0:cdf462088d13	2577	if( ssl->in_msgtype != MBEDTLS_SSL_MSG_HANDSHAKE )
markrad	0:cdf462088d13	2578	{
markrad	0:cdf462088d13	2579	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate request message" ) );
markrad	0:cdf462088d13	2580	return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE );
markrad	0:cdf462088d13	2581	}
markrad	0:cdf462088d13	2582
markrad	0:cdf462088d13	2583	ssl->record_read = 1;
markrad	0:cdf462088d13	2584	}
markrad	0:cdf462088d13	2585
markrad	0:cdf462088d13	2586	ssl->client_auth = 0;
markrad	0:cdf462088d13	2587	ssl->state++;
markrad	0:cdf462088d13	2588
markrad	0:cdf462088d13	2589	if( ssl->in_msg[0] == MBEDTLS_SSL_HS_CERTIFICATE_REQUEST )
markrad	0:cdf462088d13	2590	ssl->client_auth++;
markrad	0:cdf462088d13	2591
markrad	0:cdf462088d13	2592	MBEDTLS_SSL_DEBUG_MSG( 3, ( "got %s certificate request",
markrad	0:cdf462088d13	2593	ssl->client_auth ? "a" : "no" ) );
markrad	0:cdf462088d13	2594
markrad	0:cdf462088d13	2595	if( ssl->client_auth == 0 )
markrad	0:cdf462088d13	2596	goto exit;
markrad	0:cdf462088d13	2597
markrad	0:cdf462088d13	2598	ssl->record_read = 0;
markrad	0:cdf462088d13	2599
markrad	0:cdf462088d13	2600	/*
markrad	0:cdf462088d13	2601	* struct {
markrad	0:cdf462088d13	2602	* ClientCertificateType certificate_types<1..2^8-1>;
markrad	0:cdf462088d13	2603	* SignatureAndHashAlgorithm
markrad	0:cdf462088d13	2604	* supported_signature_algorithms<2^16-1>; -- TLS 1.2 only
markrad	0:cdf462088d13	2605	* DistinguishedName certificate_authorities<0..2^16-1>;
markrad	0:cdf462088d13	2606	* } CertificateRequest;
markrad	0:cdf462088d13	2607	*
markrad	0:cdf462088d13	2608	* Since we only support a single certificate on clients, let's just
markrad	0:cdf462088d13	2609	* ignore all the information that's supposed to help us pick a
markrad	0:cdf462088d13	2610	* certificate.
markrad	0:cdf462088d13	2611	*
markrad	0:cdf462088d13	2612	* We could check that our certificate matches the request, and bail out
markrad	0:cdf462088d13	2613	* if it doesn't, but it's simpler to just send the certificate anyway,
markrad	0:cdf462088d13	2614	* and give the server the opportunity to decide if it should terminate
markrad	0:cdf462088d13	2615	* the connection when it doesn't like our certificate.
markrad	0:cdf462088d13	2616	*
markrad	0:cdf462088d13	2617	* Same goes for the hash in TLS 1.2's signature_algorithms: at this
markrad	0:cdf462088d13	2618	* point we only have one hash available (see comments in
markrad	0:cdf462088d13	2619	* write_certificate_verify), so let's just use what we have.
markrad	0:cdf462088d13	2620	*
markrad	0:cdf462088d13	2621	* However, we still minimally parse the message to check it is at least
markrad	0:cdf462088d13	2622	* superficially sane.
markrad	0:cdf462088d13	2623	*/
markrad	0:cdf462088d13	2624	buf = ssl->in_msg;
markrad	0:cdf462088d13	2625
markrad	0:cdf462088d13	2626	/* certificate_types */
markrad	0:cdf462088d13	2627	cert_type_len = buf[mbedtls_ssl_hs_hdr_len( ssl )];
markrad	0:cdf462088d13	2628	n = cert_type_len;
markrad	0:cdf462088d13	2629
markrad	0:cdf462088d13	2630	if( ssl->in_hslen < mbedtls_ssl_hs_hdr_len( ssl ) + 2 + n )
markrad	0:cdf462088d13	2631	{
markrad	0:cdf462088d13	2632	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate request message" ) );
markrad	0:cdf462088d13	2633	return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE_REQUEST );
markrad	0:cdf462088d13	2634	}
markrad	0:cdf462088d13	2635
markrad	0:cdf462088d13	2636	/* supported_signature_algorithms */
markrad	0:cdf462088d13	2637	#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
markrad	0:cdf462088d13	2638	if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 )
markrad	0:cdf462088d13	2639	{
markrad	0:cdf462088d13	2640	size_t sig_alg_len = ( ( buf[mbedtls_ssl_hs_hdr_len( ssl ) + 1 + n] << 8 )
markrad	0:cdf462088d13	2641	\| ( buf[mbedtls_ssl_hs_hdr_len( ssl ) + 2 + n] ) );
markrad	0:cdf462088d13	2642	#if defined(MBEDTLS_DEBUG_C)
markrad	0:cdf462088d13	2643	unsigned char* sig_alg = buf + mbedtls_ssl_hs_hdr_len( ssl ) + 3 + n;
markrad	0:cdf462088d13	2644	size_t i;
markrad	0:cdf462088d13	2645
markrad	0:cdf462088d13	2646	for( i = 0; i < sig_alg_len; i += 2 )
markrad	0:cdf462088d13	2647	{
markrad	0:cdf462088d13	2648	MBEDTLS_SSL_DEBUG_MSG( 3, ( "Supported Signature Algorithm found: %d,%d", sig_alg[i], sig_alg[i + 1] ) );
markrad	0:cdf462088d13	2649	}
markrad	0:cdf462088d13	2650	#endif
markrad	0:cdf462088d13	2651
markrad	0:cdf462088d13	2652	n += 2 + sig_alg_len;
markrad	0:cdf462088d13	2653
markrad	0:cdf462088d13	2654	if( ssl->in_hslen < mbedtls_ssl_hs_hdr_len( ssl ) + 2 + n )
markrad	0:cdf462088d13	2655	{
markrad	0:cdf462088d13	2656	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate request message" ) );
markrad	0:cdf462088d13	2657	return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE_REQUEST );
markrad	0:cdf462088d13	2658	}
markrad	0:cdf462088d13	2659	}
markrad	0:cdf462088d13	2660	#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
markrad	0:cdf462088d13	2661
markrad	0:cdf462088d13	2662	/* certificate_authorities */
markrad	0:cdf462088d13	2663	dn_len = ( ( buf[mbedtls_ssl_hs_hdr_len( ssl ) + 1 + n] << 8 )
markrad	0:cdf462088d13	2664	\| ( buf[mbedtls_ssl_hs_hdr_len( ssl ) + 2 + n] ) );
markrad	0:cdf462088d13	2665
markrad	0:cdf462088d13	2666	n += dn_len;
markrad	0:cdf462088d13	2667	if( ssl->in_hslen != mbedtls_ssl_hs_hdr_len( ssl ) + 3 + n )
markrad	0:cdf462088d13	2668	{
markrad	0:cdf462088d13	2669	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate request message" ) );
markrad	0:cdf462088d13	2670	return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE_REQUEST );
markrad	0:cdf462088d13	2671	}
markrad	0:cdf462088d13	2672
markrad	0:cdf462088d13	2673	exit:
markrad	0:cdf462088d13	2674	MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse certificate request" ) );
markrad	0:cdf462088d13	2675
markrad	0:cdf462088d13	2676	return( 0 );
markrad	0:cdf462088d13	2677	}
markrad	0:cdf462088d13	2678	#endif /* !MBEDTLS_KEY_EXCHANGE_RSA_ENABLED &&
markrad	0:cdf462088d13	2679	!MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED &&
markrad	0:cdf462088d13	2680	!MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED &&
markrad	0:cdf462088d13	2681	!MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED &&
markrad	0:cdf462088d13	2682	!MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED &&
markrad	0:cdf462088d13	2683	!MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED */
markrad	0:cdf462088d13	2684
markrad	0:cdf462088d13	2685	static int ssl_parse_server_hello_done( mbedtls_ssl_context *ssl )
markrad	0:cdf462088d13	2686	{
markrad	0:cdf462088d13	2687	int ret;
markrad	0:cdf462088d13	2688
markrad	0:cdf462088d13	2689	MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse server hello done" ) );
markrad	0:cdf462088d13	2690
markrad	0:cdf462088d13	2691	if( ssl->record_read == 0 )
markrad	0:cdf462088d13	2692	{
markrad	0:cdf462088d13	2693	if( ( ret = mbedtls_ssl_read_record( ssl ) ) != 0 )
markrad	0:cdf462088d13	2694	{
markrad	0:cdf462088d13	2695	MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_read_record", ret );
markrad	0:cdf462088d13	2696	return( ret );
markrad	0:cdf462088d13	2697	}
markrad	0:cdf462088d13	2698
markrad	0:cdf462088d13	2699	if( ssl->in_msgtype != MBEDTLS_SSL_MSG_HANDSHAKE )
markrad	0:cdf462088d13	2700	{
markrad	0:cdf462088d13	2701	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server hello done message" ) );
markrad	0:cdf462088d13	2702	return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE );
markrad	0:cdf462088d13	2703	}
markrad	0:cdf462088d13	2704	}
markrad	0:cdf462088d13	2705	ssl->record_read = 0;
markrad	0:cdf462088d13	2706
markrad	0:cdf462088d13	2707	if( ssl->in_hslen != mbedtls_ssl_hs_hdr_len( ssl ) \|\|
markrad	0:cdf462088d13	2708	ssl->in_msg[0] != MBEDTLS_SSL_HS_SERVER_HELLO_DONE )
markrad	0:cdf462088d13	2709	{
markrad	0:cdf462088d13	2710	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server hello done message" ) );
markrad	0:cdf462088d13	2711	return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO_DONE );
markrad	0:cdf462088d13	2712	}
markrad	0:cdf462088d13	2713
markrad	0:cdf462088d13	2714	ssl->state++;
markrad	0:cdf462088d13	2715
markrad	0:cdf462088d13	2716	#if defined(MBEDTLS_SSL_PROTO_DTLS)
markrad	0:cdf462088d13	2717	if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
markrad	0:cdf462088d13	2718	mbedtls_ssl_recv_flight_completed( ssl );
markrad	0:cdf462088d13	2719	#endif
markrad	0:cdf462088d13	2720
markrad	0:cdf462088d13	2721	MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse server hello done" ) );
markrad	0:cdf462088d13	2722
markrad	0:cdf462088d13	2723	return( 0 );
markrad	0:cdf462088d13	2724	}
markrad	0:cdf462088d13	2725
markrad	0:cdf462088d13	2726	static int ssl_write_client_key_exchange( mbedtls_ssl_context *ssl )
markrad	0:cdf462088d13	2727	{
markrad	0:cdf462088d13	2728	int ret;
markrad	0:cdf462088d13	2729	size_t i, n;
markrad	0:cdf462088d13	2730	const mbedtls_ssl_ciphersuite_t *ciphersuite_info = ssl->transform_negotiate->ciphersuite_info;
markrad	0:cdf462088d13	2731
markrad	0:cdf462088d13	2732	MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write client key exchange" ) );
markrad	0:cdf462088d13	2733
markrad	0:cdf462088d13	2734	#if defined(MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED)
markrad	0:cdf462088d13	2735	if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_RSA )
markrad	0:cdf462088d13	2736	{
markrad	0:cdf462088d13	2737	/*
markrad	0:cdf462088d13	2738	* DHM key exchange -- send G^X mod P
markrad	0:cdf462088d13	2739	*/
markrad	0:cdf462088d13	2740	n = ssl->handshake->dhm_ctx.len;
markrad	0:cdf462088d13	2741
markrad	0:cdf462088d13	2742	ssl->out_msg[4] = (unsigned char)( n >> 8 );
markrad	0:cdf462088d13	2743	ssl->out_msg[5] = (unsigned char)( n );
markrad	0:cdf462088d13	2744	i = 6;
markrad	0:cdf462088d13	2745
markrad	0:cdf462088d13	2746	ret = mbedtls_dhm_make_public( &ssl->handshake->dhm_ctx,
markrad	0:cdf462088d13	2747	(int) mbedtls_mpi_size( &ssl->handshake->dhm_ctx.P ),
markrad	0:cdf462088d13	2748	&ssl->out_msg[i], n,
markrad	0:cdf462088d13	2749	ssl->conf->f_rng, ssl->conf->p_rng );
markrad	0:cdf462088d13	2750	if( ret != 0 )
markrad	0:cdf462088d13	2751	{
markrad	0:cdf462088d13	2752	MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_dhm_make_public", ret );
markrad	0:cdf462088d13	2753	return( ret );
markrad	0:cdf462088d13	2754	}
markrad	0:cdf462088d13	2755
markrad	0:cdf462088d13	2756	MBEDTLS_SSL_DEBUG_MPI( 3, "DHM: X ", &ssl->handshake->dhm_ctx.X );
markrad	0:cdf462088d13	2757	MBEDTLS_SSL_DEBUG_MPI( 3, "DHM: GX", &ssl->handshake->dhm_ctx.GX );
markrad	0:cdf462088d13	2758
markrad	0:cdf462088d13	2759	if( ( ret = mbedtls_dhm_calc_secret( &ssl->handshake->dhm_ctx,
markrad	0:cdf462088d13	2760	ssl->handshake->premaster,
markrad	0:cdf462088d13	2761	MBEDTLS_PREMASTER_SIZE,
markrad	0:cdf462088d13	2762	&ssl->handshake->pmslen,
markrad	0:cdf462088d13	2763	ssl->conf->f_rng, ssl->conf->p_rng ) ) != 0 )
markrad	0:cdf462088d13	2764	{
markrad	0:cdf462088d13	2765	MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_dhm_calc_secret", ret );
markrad	0:cdf462088d13	2766	return( ret );
markrad	0:cdf462088d13	2767	}
markrad	0:cdf462088d13	2768
markrad	0:cdf462088d13	2769	MBEDTLS_SSL_DEBUG_MPI( 3, "DHM: K ", &ssl->handshake->dhm_ctx.K );
markrad	0:cdf462088d13	2770	}
markrad	0:cdf462088d13	2771	else
markrad	0:cdf462088d13	2772	#endif /* MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED */
markrad	0:cdf462088d13	2773	#if defined(MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED) \|\| \
markrad	0:cdf462088d13	2774	defined(MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED) \|\| \
markrad	0:cdf462088d13	2775	defined(MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED) \|\| \
markrad	0:cdf462088d13	2776	defined(MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED)
markrad	0:cdf462088d13	2777	if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_RSA \|\|
markrad	0:cdf462088d13	2778	ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA \|\|
markrad	0:cdf462088d13	2779	ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDH_RSA \|\|
markrad	0:cdf462088d13	2780	ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA )
markrad	0:cdf462088d13	2781	{
markrad	0:cdf462088d13	2782	/*
markrad	0:cdf462088d13	2783	* ECDH key exchange -- send client public value
markrad	0:cdf462088d13	2784	*/
markrad	0:cdf462088d13	2785	i = 4;
markrad	0:cdf462088d13	2786
markrad	0:cdf462088d13	2787	ret = mbedtls_ecdh_make_public( &ssl->handshake->ecdh_ctx,
markrad	0:cdf462088d13	2788	&n,
markrad	0:cdf462088d13	2789	&ssl->out_msg[i], 1000,
markrad	0:cdf462088d13	2790	ssl->conf->f_rng, ssl->conf->p_rng );
markrad	0:cdf462088d13	2791	if( ret != 0 )
markrad	0:cdf462088d13	2792	{
markrad	0:cdf462088d13	2793	MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecdh_make_public", ret );
markrad	0:cdf462088d13	2794	return( ret );
markrad	0:cdf462088d13	2795	}
markrad	0:cdf462088d13	2796
markrad	0:cdf462088d13	2797	MBEDTLS_SSL_DEBUG_ECP( 3, "ECDH: Q", &ssl->handshake->ecdh_ctx.Q );
markrad	0:cdf462088d13	2798
markrad	0:cdf462088d13	2799	if( ( ret = mbedtls_ecdh_calc_secret( &ssl->handshake->ecdh_ctx,
markrad	0:cdf462088d13	2800	&ssl->handshake->pmslen,
markrad	0:cdf462088d13	2801	ssl->handshake->premaster,
markrad	0:cdf462088d13	2802	MBEDTLS_MPI_MAX_SIZE,
markrad	0:cdf462088d13	2803	ssl->conf->f_rng, ssl->conf->p_rng ) ) != 0 )
markrad	0:cdf462088d13	2804	{
markrad	0:cdf462088d13	2805	MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecdh_calc_secret", ret );
markrad	0:cdf462088d13	2806	return( ret );
markrad	0:cdf462088d13	2807	}
markrad	0:cdf462088d13	2808
markrad	0:cdf462088d13	2809	MBEDTLS_SSL_DEBUG_MPI( 3, "ECDH: z", &ssl->handshake->ecdh_ctx.z );
markrad	0:cdf462088d13	2810	}
markrad	0:cdf462088d13	2811	else
markrad	0:cdf462088d13	2812	#endif /* MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED \|\|
markrad	0:cdf462088d13	2813	MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED \|\|
markrad	0:cdf462088d13	2814	MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED \|\|
markrad	0:cdf462088d13	2815	MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED */
markrad	0:cdf462088d13	2816	#if defined(MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED)
markrad	0:cdf462088d13	2817	if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_PSK \|\|
markrad	0:cdf462088d13	2818	ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA_PSK \|\|
markrad	0:cdf462088d13	2819	ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_PSK \|\|
markrad	0:cdf462088d13	2820	ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_PSK )
markrad	0:cdf462088d13	2821	{
markrad	0:cdf462088d13	2822	/*
markrad	0:cdf462088d13	2823	* opaque psk_identity<0..2^16-1>;
markrad	0:cdf462088d13	2824	*/
markrad	0:cdf462088d13	2825	if( ssl->conf->psk == NULL \|\| ssl->conf->psk_identity == NULL )
markrad	0:cdf462088d13	2826	{
markrad	0:cdf462088d13	2827	MBEDTLS_SSL_DEBUG_MSG( 1, ( "got no private key for PSK" ) );
markrad	0:cdf462088d13	2828	return( MBEDTLS_ERR_SSL_PRIVATE_KEY_REQUIRED );
markrad	0:cdf462088d13	2829	}
markrad	0:cdf462088d13	2830
markrad	0:cdf462088d13	2831	i = 4;
markrad	0:cdf462088d13	2832	n = ssl->conf->psk_identity_len;
markrad	0:cdf462088d13	2833
markrad	0:cdf462088d13	2834	if( i + 2 + n > MBEDTLS_SSL_MAX_CONTENT_LEN )
markrad	0:cdf462088d13	2835	{
markrad	0:cdf462088d13	2836	MBEDTLS_SSL_DEBUG_MSG( 1, ( "psk identity too long or "
markrad	0:cdf462088d13	2837	"SSL buffer too short" ) );
markrad	0:cdf462088d13	2838	return( MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL );
markrad	0:cdf462088d13	2839	}
markrad	0:cdf462088d13	2840
markrad	0:cdf462088d13	2841	ssl->out_msg[i++] = (unsigned char)( n >> 8 );
markrad	0:cdf462088d13	2842	ssl->out_msg[i++] = (unsigned char)( n );
markrad	0:cdf462088d13	2843
markrad	0:cdf462088d13	2844	memcpy( ssl->out_msg + i, ssl->conf->psk_identity, ssl->conf->psk_identity_len );
markrad	0:cdf462088d13	2845	i += ssl->conf->psk_identity_len;
markrad	0:cdf462088d13	2846
markrad	0:cdf462088d13	2847	#if defined(MBEDTLS_KEY_EXCHANGE_PSK_ENABLED)
markrad	0:cdf462088d13	2848	if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_PSK )
markrad	0:cdf462088d13	2849	{
markrad	0:cdf462088d13	2850	n = 0;
markrad	0:cdf462088d13	2851	}
markrad	0:cdf462088d13	2852	else
markrad	0:cdf462088d13	2853	#endif
markrad	0:cdf462088d13	2854	#if defined(MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED)
markrad	0:cdf462088d13	2855	if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA_PSK )
markrad	0:cdf462088d13	2856	{
markrad	0:cdf462088d13	2857	if( ( ret = ssl_write_encrypted_pms( ssl, i, &n, 2 ) ) != 0 )
markrad	0:cdf462088d13	2858	return( ret );
markrad	0:cdf462088d13	2859	}
markrad	0:cdf462088d13	2860	else
markrad	0:cdf462088d13	2861	#endif
markrad	0:cdf462088d13	2862	#if defined(MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED)
markrad	0:cdf462088d13	2863	if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_PSK )
markrad	0:cdf462088d13	2864	{
markrad	0:cdf462088d13	2865	/*
markrad	0:cdf462088d13	2866	* ClientDiffieHellmanPublic public (DHM send G^X mod P)
markrad	0:cdf462088d13	2867	*/
markrad	0:cdf462088d13	2868	n = ssl->handshake->dhm_ctx.len;
markrad	0:cdf462088d13	2869
markrad	0:cdf462088d13	2870	if( i + 2 + n > MBEDTLS_SSL_MAX_CONTENT_LEN )
markrad	0:cdf462088d13	2871	{
markrad	0:cdf462088d13	2872	MBEDTLS_SSL_DEBUG_MSG( 1, ( "psk identity or DHM size too long"
markrad	0:cdf462088d13	2873	" or SSL buffer too short" ) );
markrad	0:cdf462088d13	2874	return( MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL );
markrad	0:cdf462088d13	2875	}
markrad	0:cdf462088d13	2876
markrad	0:cdf462088d13	2877	ssl->out_msg[i++] = (unsigned char)( n >> 8 );
markrad	0:cdf462088d13	2878	ssl->out_msg[i++] = (unsigned char)( n );
markrad	0:cdf462088d13	2879
markrad	0:cdf462088d13	2880	ret = mbedtls_dhm_make_public( &ssl->handshake->dhm_ctx,
markrad	0:cdf462088d13	2881	(int) mbedtls_mpi_size( &ssl->handshake->dhm_ctx.P ),
markrad	0:cdf462088d13	2882	&ssl->out_msg[i], n,
markrad	0:cdf462088d13	2883	ssl->conf->f_rng, ssl->conf->p_rng );
markrad	0:cdf462088d13	2884	if( ret != 0 )
markrad	0:cdf462088d13	2885	{
markrad	0:cdf462088d13	2886	MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_dhm_make_public", ret );
markrad	0:cdf462088d13	2887	return( ret );
markrad	0:cdf462088d13	2888	}
markrad	0:cdf462088d13	2889	}
markrad	0:cdf462088d13	2890	else
markrad	0:cdf462088d13	2891	#endif /* MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED */
markrad	0:cdf462088d13	2892	#if defined(MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED)
markrad	0:cdf462088d13	2893	if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_PSK )
markrad	0:cdf462088d13	2894	{
markrad	0:cdf462088d13	2895	/*
markrad	0:cdf462088d13	2896	* ClientECDiffieHellmanPublic public;
markrad	0:cdf462088d13	2897	*/
markrad	0:cdf462088d13	2898	ret = mbedtls_ecdh_make_public( &ssl->handshake->ecdh_ctx, &n,
markrad	0:cdf462088d13	2899	&ssl->out_msg[i], MBEDTLS_SSL_MAX_CONTENT_LEN - i,
markrad	0:cdf462088d13	2900	ssl->conf->f_rng, ssl->conf->p_rng );
markrad	0:cdf462088d13	2901	if( ret != 0 )
markrad	0:cdf462088d13	2902	{
markrad	0:cdf462088d13	2903	MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecdh_make_public", ret );
markrad	0:cdf462088d13	2904	return( ret );
markrad	0:cdf462088d13	2905	}
markrad	0:cdf462088d13	2906
markrad	0:cdf462088d13	2907	MBEDTLS_SSL_DEBUG_ECP( 3, "ECDH: Q", &ssl->handshake->ecdh_ctx.Q );
markrad	0:cdf462088d13	2908	}
markrad	0:cdf462088d13	2909	else
markrad	0:cdf462088d13	2910	#endif /* MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED */
markrad	0:cdf462088d13	2911	{
markrad	0:cdf462088d13	2912	MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
markrad	0:cdf462088d13	2913	return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
markrad	0:cdf462088d13	2914	}
markrad	0:cdf462088d13	2915
markrad	0:cdf462088d13	2916	if( ( ret = mbedtls_ssl_psk_derive_premaster( ssl,
markrad	0:cdf462088d13	2917	ciphersuite_info->key_exchange ) ) != 0 )
markrad	0:cdf462088d13	2918	{
markrad	0:cdf462088d13	2919	MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_psk_derive_premaster", ret );
markrad	0:cdf462088d13	2920	return( ret );
markrad	0:cdf462088d13	2921	}
markrad	0:cdf462088d13	2922	}
markrad	0:cdf462088d13	2923	else
markrad	0:cdf462088d13	2924	#endif /* MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED */
markrad	0:cdf462088d13	2925	#if defined(MBEDTLS_KEY_EXCHANGE_RSA_ENABLED)
markrad	0:cdf462088d13	2926	if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA )
markrad	0:cdf462088d13	2927	{
markrad	0:cdf462088d13	2928	i = 4;
markrad	0:cdf462088d13	2929	if( ( ret = ssl_write_encrypted_pms( ssl, i, &n, 0 ) ) != 0 )
markrad	0:cdf462088d13	2930	return( ret );
markrad	0:cdf462088d13	2931	}
markrad	0:cdf462088d13	2932	else
markrad	0:cdf462088d13	2933	#endif /* MBEDTLS_KEY_EXCHANGE_RSA_ENABLED */
markrad	0:cdf462088d13	2934	#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
markrad	0:cdf462088d13	2935	if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECJPAKE )
markrad	0:cdf462088d13	2936	{
markrad	0:cdf462088d13	2937	i = 4;
markrad	0:cdf462088d13	2938
markrad	0:cdf462088d13	2939	ret = mbedtls_ecjpake_write_round_two( &ssl->handshake->ecjpake_ctx,
markrad	0:cdf462088d13	2940	ssl->out_msg + i, MBEDTLS_SSL_MAX_CONTENT_LEN - i, &n,
markrad	0:cdf462088d13	2941	ssl->conf->f_rng, ssl->conf->p_rng );
markrad	0:cdf462088d13	2942	if( ret != 0 )
markrad	0:cdf462088d13	2943	{
markrad	0:cdf462088d13	2944	MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecjpake_write_round_two", ret );
markrad	0:cdf462088d13	2945	return( ret );
markrad	0:cdf462088d13	2946	}
markrad	0:cdf462088d13	2947
markrad	0:cdf462088d13	2948	ret = mbedtls_ecjpake_derive_secret( &ssl->handshake->ecjpake_ctx,
markrad	0:cdf462088d13	2949	ssl->handshake->premaster, 32, &ssl->handshake->pmslen,
markrad	0:cdf462088d13	2950	ssl->conf->f_rng, ssl->conf->p_rng );
markrad	0:cdf462088d13	2951	if( ret != 0 )
markrad	0:cdf462088d13	2952	{
markrad	0:cdf462088d13	2953	MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecjpake_derive_secret", ret );
markrad	0:cdf462088d13	2954	return( ret );
markrad	0:cdf462088d13	2955	}
markrad	0:cdf462088d13	2956	}
markrad	0:cdf462088d13	2957	else
markrad	0:cdf462088d13	2958	#endif /* MBEDTLS_KEY_EXCHANGE_RSA_ENABLED */
markrad	0:cdf462088d13	2959	{
markrad	0:cdf462088d13	2960	((void) ciphersuite_info);
markrad	0:cdf462088d13	2961	MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
markrad	0:cdf462088d13	2962	return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
markrad	0:cdf462088d13	2963	}
markrad	0:cdf462088d13	2964
markrad	0:cdf462088d13	2965	ssl->out_msglen = i + n;
markrad	0:cdf462088d13	2966	ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE;
markrad	0:cdf462088d13	2967	ssl->out_msg[0] = MBEDTLS_SSL_HS_CLIENT_KEY_EXCHANGE;
markrad	0:cdf462088d13	2968
markrad	0:cdf462088d13	2969	ssl->state++;
markrad	0:cdf462088d13	2970
markrad	0:cdf462088d13	2971	if( ( ret = mbedtls_ssl_write_record( ssl ) ) != 0 )
markrad	0:cdf462088d13	2972	{
markrad	0:cdf462088d13	2973	MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_record", ret );
markrad	0:cdf462088d13	2974	return( ret );
markrad	0:cdf462088d13	2975	}
markrad	0:cdf462088d13	2976
markrad	0:cdf462088d13	2977	MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write client key exchange" ) );
markrad	0:cdf462088d13	2978
markrad	0:cdf462088d13	2979	return( 0 );
markrad	0:cdf462088d13	2980	}
markrad	0:cdf462088d13	2981
markrad	0:cdf462088d13	2982	#if !defined(MBEDTLS_KEY_EXCHANGE_RSA_ENABLED) && \
markrad	0:cdf462088d13	2983	!defined(MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED) && \
markrad	0:cdf462088d13	2984	!defined(MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED) && \
markrad	0:cdf462088d13	2985	!defined(MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED) && \
markrad	0:cdf462088d13	2986	!defined(MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED)&& \
markrad	0:cdf462088d13	2987	!defined(MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED)
markrad	0:cdf462088d13	2988	static int ssl_write_certificate_verify( mbedtls_ssl_context *ssl )
markrad	0:cdf462088d13	2989	{
markrad	0:cdf462088d13	2990	const mbedtls_ssl_ciphersuite_t *ciphersuite_info = ssl->transform_negotiate->ciphersuite_info;
markrad	0:cdf462088d13	2991	int ret;
markrad	0:cdf462088d13	2992
markrad	0:cdf462088d13	2993	MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write certificate verify" ) );
markrad	0:cdf462088d13	2994
markrad	0:cdf462088d13	2995	if( ( ret = mbedtls_ssl_derive_keys( ssl ) ) != 0 )
markrad	0:cdf462088d13	2996	{
markrad	0:cdf462088d13	2997	MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_derive_keys", ret );
markrad	0:cdf462088d13	2998	return( ret );
markrad	0:cdf462088d13	2999	}
markrad	0:cdf462088d13	3000
markrad	0:cdf462088d13	3001	if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_PSK \|\|
markrad	0:cdf462088d13	3002	ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA_PSK \|\|
markrad	0:cdf462088d13	3003	ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_PSK \|\|
markrad	0:cdf462088d13	3004	ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_PSK \|\|
markrad	0:cdf462088d13	3005	ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECJPAKE )
markrad	0:cdf462088d13	3006	{
markrad	0:cdf462088d13	3007	MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip write certificate verify" ) );
markrad	0:cdf462088d13	3008	ssl->state++;
markrad	0:cdf462088d13	3009	return( 0 );
markrad	0:cdf462088d13	3010	}
markrad	0:cdf462088d13	3011
markrad	0:cdf462088d13	3012	MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
markrad	0:cdf462088d13	3013	return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
markrad	0:cdf462088d13	3014	}
markrad	0:cdf462088d13	3015	#else
markrad	0:cdf462088d13	3016	static int ssl_write_certificate_verify( mbedtls_ssl_context *ssl )
markrad	0:cdf462088d13	3017	{
markrad	0:cdf462088d13	3018	int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE;
markrad	0:cdf462088d13	3019	const mbedtls_ssl_ciphersuite_t *ciphersuite_info = ssl->transform_negotiate->ciphersuite_info;
markrad	0:cdf462088d13	3020	size_t n = 0, offset = 0;
markrad	0:cdf462088d13	3021	unsigned char hash[48];
markrad	0:cdf462088d13	3022	unsigned char *hash_start = hash;
markrad	0:cdf462088d13	3023	mbedtls_md_type_t md_alg = MBEDTLS_MD_NONE;
markrad	0:cdf462088d13	3024	unsigned int hashlen;
markrad	0:cdf462088d13	3025
markrad	0:cdf462088d13	3026	MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write certificate verify" ) );
markrad	0:cdf462088d13	3027
markrad	0:cdf462088d13	3028	if( ( ret = mbedtls_ssl_derive_keys( ssl ) ) != 0 )
markrad	0:cdf462088d13	3029	{
markrad	0:cdf462088d13	3030	MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_derive_keys", ret );
markrad	0:cdf462088d13	3031	return( ret );
markrad	0:cdf462088d13	3032	}
markrad	0:cdf462088d13	3033
markrad	0:cdf462088d13	3034	if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_PSK \|\|
markrad	0:cdf462088d13	3035	ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA_PSK \|\|
markrad	0:cdf462088d13	3036	ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_PSK \|\|
markrad	0:cdf462088d13	3037	ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_PSK \|\|
markrad	0:cdf462088d13	3038	ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECJPAKE )
markrad	0:cdf462088d13	3039	{
markrad	0:cdf462088d13	3040	MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip write certificate verify" ) );
markrad	0:cdf462088d13	3041	ssl->state++;
markrad	0:cdf462088d13	3042	return( 0 );
markrad	0:cdf462088d13	3043	}
markrad	0:cdf462088d13	3044
markrad	0:cdf462088d13	3045	if( ssl->client_auth == 0 \|\| mbedtls_ssl_own_cert( ssl ) == NULL )
markrad	0:cdf462088d13	3046	{
markrad	0:cdf462088d13	3047	MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip write certificate verify" ) );
markrad	0:cdf462088d13	3048	ssl->state++;
markrad	0:cdf462088d13	3049	return( 0 );
markrad	0:cdf462088d13	3050	}
markrad	0:cdf462088d13	3051
markrad	0:cdf462088d13	3052	if( mbedtls_ssl_own_key( ssl ) == NULL )
markrad	0:cdf462088d13	3053	{
markrad	0:cdf462088d13	3054	MBEDTLS_SSL_DEBUG_MSG( 1, ( "got no private key for certificate" ) );
markrad	0:cdf462088d13	3055	return( MBEDTLS_ERR_SSL_PRIVATE_KEY_REQUIRED );
markrad	0:cdf462088d13	3056	}
markrad	0:cdf462088d13	3057
markrad	0:cdf462088d13	3058	/*
markrad	0:cdf462088d13	3059	* Make an RSA signature of the handshake digests
markrad	0:cdf462088d13	3060	*/
markrad	0:cdf462088d13	3061	ssl->handshake->calc_verify( ssl, hash );
markrad	0:cdf462088d13	3062
markrad	0:cdf462088d13	3063	#if defined(MBEDTLS_SSL_PROTO_SSL3) \|\| defined(MBEDTLS_SSL_PROTO_TLS1) \|\| \
markrad	0:cdf462088d13	3064	defined(MBEDTLS_SSL_PROTO_TLS1_1)
markrad	0:cdf462088d13	3065	if( ssl->minor_ver != MBEDTLS_SSL_MINOR_VERSION_3 )
markrad	0:cdf462088d13	3066	{
markrad	0:cdf462088d13	3067	/*
markrad	0:cdf462088d13	3068	* digitally-signed struct {
markrad	0:cdf462088d13	3069	* opaque md5_hash[16];
markrad	0:cdf462088d13	3070	* opaque sha_hash[20];
markrad	0:cdf462088d13	3071	* };
markrad	0:cdf462088d13	3072	*
markrad	0:cdf462088d13	3073	* md5_hash
markrad	0:cdf462088d13	3074	* MD5(handshake_messages);
markrad	0:cdf462088d13	3075	*
markrad	0:cdf462088d13	3076	* sha_hash
markrad	0:cdf462088d13	3077	* SHA(handshake_messages);
markrad	0:cdf462088d13	3078	*/
markrad	0:cdf462088d13	3079	hashlen = 36;
markrad	0:cdf462088d13	3080	md_alg = MBEDTLS_MD_NONE;
markrad	0:cdf462088d13	3081
markrad	0:cdf462088d13	3082	/*
markrad	0:cdf462088d13	3083	* For ECDSA, default hash is SHA-1 only
markrad	0:cdf462088d13	3084	*/
markrad	0:cdf462088d13	3085	if( mbedtls_pk_can_do( mbedtls_ssl_own_key( ssl ), MBEDTLS_PK_ECDSA ) )
markrad	0:cdf462088d13	3086	{
markrad	0:cdf462088d13	3087	hash_start += 16;
markrad	0:cdf462088d13	3088	hashlen -= 16;
markrad	0:cdf462088d13	3089	md_alg = MBEDTLS_MD_SHA1;
markrad	0:cdf462088d13	3090	}
markrad	0:cdf462088d13	3091	}
markrad	0:cdf462088d13	3092	else
markrad	0:cdf462088d13	3093	#endif /* MBEDTLS_SSL_PROTO_SSL3 \|\| MBEDTLS_SSL_PROTO_TLS1 \|\| \
markrad	0:cdf462088d13	3094	MBEDTLS_SSL_PROTO_TLS1_1 */
markrad	0:cdf462088d13	3095	#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
markrad	0:cdf462088d13	3096	if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 )
markrad	0:cdf462088d13	3097	{
markrad	0:cdf462088d13	3098	/*
markrad	0:cdf462088d13	3099	* digitally-signed struct {
markrad	0:cdf462088d13	3100	* opaque handshake_messages[handshake_messages_length];
markrad	0:cdf462088d13	3101	* };
markrad	0:cdf462088d13	3102	*
markrad	0:cdf462088d13	3103	* Taking shortcut here. We assume that the server always allows the
markrad	0:cdf462088d13	3104	* PRF Hash function and has sent it in the allowed signature
markrad	0:cdf462088d13	3105	* algorithms list received in the Certificate Request message.
markrad	0:cdf462088d13	3106	*
markrad	0:cdf462088d13	3107	* Until we encounter a server that does not, we will take this
markrad	0:cdf462088d13	3108	* shortcut.
markrad	0:cdf462088d13	3109	*
markrad	0:cdf462088d13	3110	* Reason: Otherwise we should have running hashes for SHA512 and SHA224
markrad	0:cdf462088d13	3111	* in order to satisfy 'weird' needs from the server side.
markrad	0:cdf462088d13	3112	*/
markrad	0:cdf462088d13	3113	if( ssl->transform_negotiate->ciphersuite_info->mac ==
markrad	0:cdf462088d13	3114	MBEDTLS_MD_SHA384 )
markrad	0:cdf462088d13	3115	{
markrad	0:cdf462088d13	3116	md_alg = MBEDTLS_MD_SHA384;
markrad	0:cdf462088d13	3117	ssl->out_msg[4] = MBEDTLS_SSL_HASH_SHA384;
markrad	0:cdf462088d13	3118	}
markrad	0:cdf462088d13	3119	else
markrad	0:cdf462088d13	3120	{
markrad	0:cdf462088d13	3121	md_alg = MBEDTLS_MD_SHA256;
markrad	0:cdf462088d13	3122	ssl->out_msg[4] = MBEDTLS_SSL_HASH_SHA256;
markrad	0:cdf462088d13	3123	}
markrad	0:cdf462088d13	3124	ssl->out_msg[5] = mbedtls_ssl_sig_from_pk( mbedtls_ssl_own_key( ssl ) );
markrad	0:cdf462088d13	3125
markrad	0:cdf462088d13	3126	/* Info from md_alg will be used instead */
markrad	0:cdf462088d13	3127	hashlen = 0;
markrad	0:cdf462088d13	3128	offset = 2;
markrad	0:cdf462088d13	3129	}
markrad	0:cdf462088d13	3130	else
markrad	0:cdf462088d13	3131	#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
markrad	0:cdf462088d13	3132	{
markrad	0:cdf462088d13	3133	MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
markrad	0:cdf462088d13	3134	return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
markrad	0:cdf462088d13	3135	}
markrad	0:cdf462088d13	3136
markrad	0:cdf462088d13	3137	if( ( ret = mbedtls_pk_sign( mbedtls_ssl_own_key( ssl ), md_alg, hash_start, hashlen,
markrad	0:cdf462088d13	3138	ssl->out_msg + 6 + offset, &n,
markrad	0:cdf462088d13	3139	ssl->conf->f_rng, ssl->conf->p_rng ) ) != 0 )
markrad	0:cdf462088d13	3140	{
markrad	0:cdf462088d13	3141	MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_pk_sign", ret );
markrad	0:cdf462088d13	3142	return( ret );
markrad	0:cdf462088d13	3143	}
markrad	0:cdf462088d13	3144
markrad	0:cdf462088d13	3145	ssl->out_msg[4 + offset] = (unsigned char)( n >> 8 );
markrad	0:cdf462088d13	3146	ssl->out_msg[5 + offset] = (unsigned char)( n );
markrad	0:cdf462088d13	3147
markrad	0:cdf462088d13	3148	ssl->out_msglen = 6 + n + offset;
markrad	0:cdf462088d13	3149	ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE;
markrad	0:cdf462088d13	3150	ssl->out_msg[0] = MBEDTLS_SSL_HS_CERTIFICATE_VERIFY;
markrad	0:cdf462088d13	3151
markrad	0:cdf462088d13	3152	ssl->state++;
markrad	0:cdf462088d13	3153
markrad	0:cdf462088d13	3154	if( ( ret = mbedtls_ssl_write_record( ssl ) ) != 0 )
markrad	0:cdf462088d13	3155	{
markrad	0:cdf462088d13	3156	MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_record", ret );
markrad	0:cdf462088d13	3157	return( ret );
markrad	0:cdf462088d13	3158	}
markrad	0:cdf462088d13	3159
markrad	0:cdf462088d13	3160	MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write certificate verify" ) );
markrad	0:cdf462088d13	3161
markrad	0:cdf462088d13	3162	return( ret );
markrad	0:cdf462088d13	3163	}
markrad	0:cdf462088d13	3164	#endif /* !MBEDTLS_KEY_EXCHANGE_RSA_ENABLED &&
markrad	0:cdf462088d13	3165	!MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED &&
markrad	0:cdf462088d13	3166	!MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED &&
markrad	0:cdf462088d13	3167	!MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED &&
markrad	0:cdf462088d13	3168	!MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED &&
markrad	0:cdf462088d13	3169	!MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED */
markrad	0:cdf462088d13	3170
markrad	0:cdf462088d13	3171	#if defined(MBEDTLS_SSL_SESSION_TICKETS)
markrad	0:cdf462088d13	3172	static int ssl_parse_new_session_ticket( mbedtls_ssl_context *ssl )
markrad	0:cdf462088d13	3173	{
markrad	0:cdf462088d13	3174	int ret;
markrad	0:cdf462088d13	3175	uint32_t lifetime;
markrad	0:cdf462088d13	3176	size_t ticket_len;
markrad	0:cdf462088d13	3177	unsigned char *ticket;
markrad	0:cdf462088d13	3178	const unsigned char *msg;
markrad	0:cdf462088d13	3179
markrad	0:cdf462088d13	3180	MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse new session ticket" ) );
markrad	0:cdf462088d13	3181
markrad	0:cdf462088d13	3182	if( ( ret = mbedtls_ssl_read_record( ssl ) ) != 0 )
markrad	0:cdf462088d13	3183	{
markrad	0:cdf462088d13	3184	MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_read_record", ret );
markrad	0:cdf462088d13	3185	return( ret );
markrad	0:cdf462088d13	3186	}
markrad	0:cdf462088d13	3187
markrad	0:cdf462088d13	3188	if( ssl->in_msgtype != MBEDTLS_SSL_MSG_HANDSHAKE )
markrad	0:cdf462088d13	3189	{
markrad	0:cdf462088d13	3190	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad new session ticket message" ) );
markrad	0:cdf462088d13	3191	return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE );
markrad	0:cdf462088d13	3192	}
markrad	0:cdf462088d13	3193
markrad	0:cdf462088d13	3194	/*
markrad	0:cdf462088d13	3195	* struct {
markrad	0:cdf462088d13	3196	* uint32 ticket_lifetime_hint;
markrad	0:cdf462088d13	3197	* opaque ticket<0..2^16-1>;
markrad	0:cdf462088d13	3198	* } NewSessionTicket;
markrad	0:cdf462088d13	3199	*
markrad	0:cdf462088d13	3200	* 0 . 3 ticket_lifetime_hint
markrad	0:cdf462088d13	3201	* 4 . 5 ticket_len (n)
markrad	0:cdf462088d13	3202	* 6 . 5+n ticket content
markrad	0:cdf462088d13	3203	*/
markrad	0:cdf462088d13	3204	if( ssl->in_msg[0] != MBEDTLS_SSL_HS_NEW_SESSION_TICKET \|\|
markrad	0:cdf462088d13	3205	ssl->in_hslen < 6 + mbedtls_ssl_hs_hdr_len( ssl ) )
markrad	0:cdf462088d13	3206	{
markrad	0:cdf462088d13	3207	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad new session ticket message" ) );
markrad	0:cdf462088d13	3208	return( MBEDTLS_ERR_SSL_BAD_HS_NEW_SESSION_TICKET );
markrad	0:cdf462088d13	3209	}
markrad	0:cdf462088d13	3210
markrad	0:cdf462088d13	3211	msg = ssl->in_msg + mbedtls_ssl_hs_hdr_len( ssl );
markrad	0:cdf462088d13	3212
markrad	0:cdf462088d13	3213	lifetime = ( msg[0] << 24 ) \| ( msg[1] << 16 ) \|
markrad	0:cdf462088d13	3214	( msg[2] << 8 ) \| ( msg[3] );
markrad	0:cdf462088d13	3215
markrad	0:cdf462088d13	3216	ticket_len = ( msg[4] << 8 ) \| ( msg[5] );
markrad	0:cdf462088d13	3217
markrad	0:cdf462088d13	3218	if( ticket_len + 6 + mbedtls_ssl_hs_hdr_len( ssl ) != ssl->in_hslen )
markrad	0:cdf462088d13	3219	{
markrad	0:cdf462088d13	3220	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad new session ticket message" ) );
markrad	0:cdf462088d13	3221	return( MBEDTLS_ERR_SSL_BAD_HS_NEW_SESSION_TICKET );
markrad	0:cdf462088d13	3222	}
markrad	0:cdf462088d13	3223
markrad	0:cdf462088d13	3224	MBEDTLS_SSL_DEBUG_MSG( 3, ( "ticket length: %d", ticket_len ) );
markrad	0:cdf462088d13	3225
markrad	0:cdf462088d13	3226	/* We're not waiting for a NewSessionTicket message any more */
markrad	0:cdf462088d13	3227	ssl->handshake->new_session_ticket = 0;
markrad	0:cdf462088d13	3228	ssl->state = MBEDTLS_SSL_SERVER_CHANGE_CIPHER_SPEC;
markrad	0:cdf462088d13	3229
markrad	0:cdf462088d13	3230	/*
markrad	0:cdf462088d13	3231	* Zero-length ticket means the server changed his mind and doesn't want
markrad	0:cdf462088d13	3232	* to send a ticket after all, so just forget it
markrad	0:cdf462088d13	3233	*/
markrad	0:cdf462088d13	3234	if( ticket_len == 0 )
markrad	0:cdf462088d13	3235	return( 0 );
markrad	0:cdf462088d13	3236
markrad	0:cdf462088d13	3237	mbedtls_zeroize( ssl->session_negotiate->ticket,
markrad	0:cdf462088d13	3238	ssl->session_negotiate->ticket_len );
markrad	0:cdf462088d13	3239	mbedtls_free( ssl->session_negotiate->ticket );
markrad	0:cdf462088d13	3240	ssl->session_negotiate->ticket = NULL;
markrad	0:cdf462088d13	3241	ssl->session_negotiate->ticket_len = 0;
markrad	0:cdf462088d13	3242
markrad	0:cdf462088d13	3243	if( ( ticket = mbedtls_calloc( 1, ticket_len ) ) == NULL )
markrad	0:cdf462088d13	3244	{
markrad	0:cdf462088d13	3245	MBEDTLS_SSL_DEBUG_MSG( 1, ( "ticket alloc failed" ) );
markrad	0:cdf462088d13	3246	return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
markrad	0:cdf462088d13	3247	}
markrad	0:cdf462088d13	3248
markrad	0:cdf462088d13	3249	memcpy( ticket, msg + 6, ticket_len );
markrad	0:cdf462088d13	3250
markrad	0:cdf462088d13	3251	ssl->session_negotiate->ticket = ticket;
markrad	0:cdf462088d13	3252	ssl->session_negotiate->ticket_len = ticket_len;
markrad	0:cdf462088d13	3253	ssl->session_negotiate->ticket_lifetime = lifetime;
markrad	0:cdf462088d13	3254
markrad	0:cdf462088d13	3255	/*
markrad	0:cdf462088d13	3256	* RFC 5077 section 3.4:
markrad	0:cdf462088d13	3257	* "If the client receives a session ticket from the server, then it
markrad	0:cdf462088d13	3258	* discards any Session ID that was sent in the ServerHello."
markrad	0:cdf462088d13	3259	*/
markrad	0:cdf462088d13	3260	MBEDTLS_SSL_DEBUG_MSG( 3, ( "ticket in use, discarding session id" ) );
markrad	0:cdf462088d13	3261	ssl->session_negotiate->id_len = 0;
markrad	0:cdf462088d13	3262
markrad	0:cdf462088d13	3263	MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse new session ticket" ) );
markrad	0:cdf462088d13	3264
markrad	0:cdf462088d13	3265	return( 0 );
markrad	0:cdf462088d13	3266	}
markrad	0:cdf462088d13	3267	#endif /* MBEDTLS_SSL_SESSION_TICKETS */
markrad	0:cdf462088d13	3268
markrad	0:cdf462088d13	3269	/*
markrad	0:cdf462088d13	3270	* SSL handshake -- client side -- single step
markrad	0:cdf462088d13	3271	*/
markrad	0:cdf462088d13	3272	int mbedtls_ssl_handshake_client_step( mbedtls_ssl_context *ssl )
markrad	0:cdf462088d13	3273	{
markrad	0:cdf462088d13	3274	int ret = 0;
markrad	0:cdf462088d13	3275
markrad	0:cdf462088d13	3276	if( ssl->state == MBEDTLS_SSL_HANDSHAKE_OVER \|\| ssl->handshake == NULL )
markrad	0:cdf462088d13	3277	return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
markrad	0:cdf462088d13	3278
markrad	0:cdf462088d13	3279	MBEDTLS_SSL_DEBUG_MSG( 2, ( "client state: %d", ssl->state ) );
markrad	0:cdf462088d13	3280
markrad	0:cdf462088d13	3281	if( ( ret = mbedtls_ssl_flush_output( ssl ) ) != 0 )
markrad	0:cdf462088d13	3282	return( ret );
markrad	0:cdf462088d13	3283
markrad	0:cdf462088d13	3284	#if defined(MBEDTLS_SSL_PROTO_DTLS)
markrad	0:cdf462088d13	3285	if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
markrad	0:cdf462088d13	3286	ssl->handshake->retransmit_state == MBEDTLS_SSL_RETRANS_SENDING )
markrad	0:cdf462088d13	3287	{
markrad	0:cdf462088d13	3288	if( ( ret = mbedtls_ssl_resend( ssl ) ) != 0 )
markrad	0:cdf462088d13	3289	return( ret );
markrad	0:cdf462088d13	3290	}
markrad	0:cdf462088d13	3291	#endif
markrad	0:cdf462088d13	3292
markrad	0:cdf462088d13	3293	/* Change state now, so that it is right in mbedtls_ssl_read_record(), used
markrad	0:cdf462088d13	3294	* by DTLS for dropping out-of-sequence ChangeCipherSpec records */
markrad	0:cdf462088d13	3295	#if defined(MBEDTLS_SSL_SESSION_TICKETS)
markrad	0:cdf462088d13	3296	if( ssl->state == MBEDTLS_SSL_SERVER_CHANGE_CIPHER_SPEC &&
markrad	0:cdf462088d13	3297	ssl->handshake->new_session_ticket != 0 )
markrad	0:cdf462088d13	3298	{
markrad	0:cdf462088d13	3299	ssl->state = MBEDTLS_SSL_SERVER_NEW_SESSION_TICKET;
markrad	0:cdf462088d13	3300	}
markrad	0:cdf462088d13	3301	#endif
markrad	0:cdf462088d13	3302
markrad	0:cdf462088d13	3303	switch( ssl->state )
markrad	0:cdf462088d13	3304	{
markrad	0:cdf462088d13	3305	case MBEDTLS_SSL_HELLO_REQUEST:
markrad	0:cdf462088d13	3306	ssl->state = MBEDTLS_SSL_CLIENT_HELLO;
markrad	0:cdf462088d13	3307	break;
markrad	0:cdf462088d13	3308
markrad	0:cdf462088d13	3309	/*
markrad	0:cdf462088d13	3310	* ==> ClientHello
markrad	0:cdf462088d13	3311	*/
markrad	0:cdf462088d13	3312	case MBEDTLS_SSL_CLIENT_HELLO:
markrad	0:cdf462088d13	3313	ret = ssl_write_client_hello( ssl );
markrad	0:cdf462088d13	3314	break;
markrad	0:cdf462088d13	3315
markrad	0:cdf462088d13	3316	/*
markrad	0:cdf462088d13	3317	* <== ServerHello
markrad	0:cdf462088d13	3318	* Certificate
markrad	0:cdf462088d13	3319	* ( ServerKeyExchange )
markrad	0:cdf462088d13	3320	* ( CertificateRequest )
markrad	0:cdf462088d13	3321	* ServerHelloDone
markrad	0:cdf462088d13	3322	*/
markrad	0:cdf462088d13	3323	case MBEDTLS_SSL_SERVER_HELLO:
markrad	0:cdf462088d13	3324	ret = ssl_parse_server_hello( ssl );
markrad	0:cdf462088d13	3325	break;
markrad	0:cdf462088d13	3326
markrad	0:cdf462088d13	3327	case MBEDTLS_SSL_SERVER_CERTIFICATE:
markrad	0:cdf462088d13	3328	ret = mbedtls_ssl_parse_certificate( ssl );
markrad	0:cdf462088d13	3329	break;
markrad	0:cdf462088d13	3330
markrad	0:cdf462088d13	3331	case MBEDTLS_SSL_SERVER_KEY_EXCHANGE:
markrad	0:cdf462088d13	3332	ret = ssl_parse_server_key_exchange( ssl );
markrad	0:cdf462088d13	3333	break;
markrad	0:cdf462088d13	3334
markrad	0:cdf462088d13	3335	case MBEDTLS_SSL_CERTIFICATE_REQUEST:
markrad	0:cdf462088d13	3336	ret = ssl_parse_certificate_request( ssl );
markrad	0:cdf462088d13	3337	break;
markrad	0:cdf462088d13	3338
markrad	0:cdf462088d13	3339	case MBEDTLS_SSL_SERVER_HELLO_DONE:
markrad	0:cdf462088d13	3340	ret = ssl_parse_server_hello_done( ssl );
markrad	0:cdf462088d13	3341	break;
markrad	0:cdf462088d13	3342
markrad	0:cdf462088d13	3343	/*
markrad	0:cdf462088d13	3344	* ==> ( Certificate/Alert )
markrad	0:cdf462088d13	3345	* ClientKeyExchange
markrad	0:cdf462088d13	3346	* ( CertificateVerify )
markrad	0:cdf462088d13	3347	* ChangeCipherSpec
markrad	0:cdf462088d13	3348	* Finished
markrad	0:cdf462088d13	3349	*/
markrad	0:cdf462088d13	3350	case MBEDTLS_SSL_CLIENT_CERTIFICATE:
markrad	0:cdf462088d13	3351	ret = mbedtls_ssl_write_certificate( ssl );
markrad	0:cdf462088d13	3352	break;
markrad	0:cdf462088d13	3353
markrad	0:cdf462088d13	3354	case MBEDTLS_SSL_CLIENT_KEY_EXCHANGE:
markrad	0:cdf462088d13	3355	ret = ssl_write_client_key_exchange( ssl );
markrad	0:cdf462088d13	3356	break;
markrad	0:cdf462088d13	3357
markrad	0:cdf462088d13	3358	case MBEDTLS_SSL_CERTIFICATE_VERIFY:
markrad	0:cdf462088d13	3359	ret = ssl_write_certificate_verify( ssl );
markrad	0:cdf462088d13	3360	break;
markrad	0:cdf462088d13	3361
markrad	0:cdf462088d13	3362	case MBEDTLS_SSL_CLIENT_CHANGE_CIPHER_SPEC:
markrad	0:cdf462088d13	3363	ret = mbedtls_ssl_write_change_cipher_spec( ssl );
markrad	0:cdf462088d13	3364	break;
markrad	0:cdf462088d13	3365
markrad	0:cdf462088d13	3366	case MBEDTLS_SSL_CLIENT_FINISHED:
markrad	0:cdf462088d13	3367	ret = mbedtls_ssl_write_finished( ssl );
markrad	0:cdf462088d13	3368	break;
markrad	0:cdf462088d13	3369
markrad	0:cdf462088d13	3370	/*
markrad	0:cdf462088d13	3371	* <== ( NewSessionTicket )
markrad	0:cdf462088d13	3372	* ChangeCipherSpec
markrad	0:cdf462088d13	3373	* Finished
markrad	0:cdf462088d13	3374	*/
markrad	0:cdf462088d13	3375	#if defined(MBEDTLS_SSL_SESSION_TICKETS)
markrad	0:cdf462088d13	3376	case MBEDTLS_SSL_SERVER_NEW_SESSION_TICKET:
markrad	0:cdf462088d13	3377	ret = ssl_parse_new_session_ticket( ssl );
markrad	0:cdf462088d13	3378	break;
markrad	0:cdf462088d13	3379	#endif
markrad	0:cdf462088d13	3380
markrad	0:cdf462088d13	3381	case MBEDTLS_SSL_SERVER_CHANGE_CIPHER_SPEC:
markrad	0:cdf462088d13	3382	ret = mbedtls_ssl_parse_change_cipher_spec( ssl );
markrad	0:cdf462088d13	3383	break;
markrad	0:cdf462088d13	3384
markrad	0:cdf462088d13	3385	case MBEDTLS_SSL_SERVER_FINISHED:
markrad	0:cdf462088d13	3386	ret = mbedtls_ssl_parse_finished( ssl );
markrad	0:cdf462088d13	3387	break;
markrad	0:cdf462088d13	3388
markrad	0:cdf462088d13	3389	case MBEDTLS_SSL_FLUSH_BUFFERS:
markrad	0:cdf462088d13	3390	MBEDTLS_SSL_DEBUG_MSG( 2, ( "handshake: done" ) );
markrad	0:cdf462088d13	3391	ssl->state = MBEDTLS_SSL_HANDSHAKE_WRAPUP;
markrad	0:cdf462088d13	3392	break;
markrad	0:cdf462088d13	3393
markrad	0:cdf462088d13	3394	case MBEDTLS_SSL_HANDSHAKE_WRAPUP:
markrad	0:cdf462088d13	3395	mbedtls_ssl_handshake_wrapup( ssl );
markrad	0:cdf462088d13	3396	break;
markrad	0:cdf462088d13	3397
markrad	0:cdf462088d13	3398	default:
markrad	0:cdf462088d13	3399	MBEDTLS_SSL_DEBUG_MSG( 1, ( "invalid state %d", ssl->state ) );
markrad	0:cdf462088d13	3400	return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
markrad	0:cdf462088d13	3401	}
markrad	0:cdf462088d13	3402
markrad	0:cdf462088d13	3403	return( ret );
markrad	0:cdf462088d13	3404	}
markrad	0:cdf462088d13	3405	#endif /* MBEDTLS_SSL_CLI_C */

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Type:	Library
Created:	04 Jun 2019
Imports:	1
Forks:	0
Commits:	2
Dependents:	1
Dependencies:	0
Followers:	2

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Willie Solano

Pablo Andrés Araya Castillo

library/ssl_cli.c@0:cdf462088d13, 2017-01-05 (annotated)

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