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features/mbedtls/src/ssl_cli.c@0:f269e3021894, 2016-10-23 (annotated)

Committer:: elessair
Date:: Sun Oct 23 15:10:02 2016 +0000
Revision:: 0:f269e3021894

Initial commit

Who changed what in which revision?

User	Revision	Line number	New contents of line
elessair	0:f269e3021894	1	/*
elessair	0:f269e3021894	2	* SSLv3/TLSv1 client-side functions
elessair	0:f269e3021894	3	*
elessair	0:f269e3021894	4	* Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
elessair	0:f269e3021894	5	* SPDX-License-Identifier: Apache-2.0
elessair	0:f269e3021894	6	*
elessair	0:f269e3021894	7	* Licensed under the Apache License, Version 2.0 (the "License"); you may
elessair	0:f269e3021894	8	* not use this file except in compliance with the License.
elessair	0:f269e3021894	9	* You may obtain a copy of the License at
elessair	0:f269e3021894	10	*
elessair	0:f269e3021894	11	* http://www.apache.org/licenses/LICENSE-2.0
elessair	0:f269e3021894	12	*
elessair	0:f269e3021894	13	* Unless required by applicable law or agreed to in writing, software
elessair	0:f269e3021894	14	* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
elessair	0:f269e3021894	15	* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
elessair	0:f269e3021894	16	* See the License for the specific language governing permissions and
elessair	0:f269e3021894	17	* limitations under the License.
elessair	0:f269e3021894	18	*
elessair	0:f269e3021894	19	* This file is part of mbed TLS (https://tls.mbed.org)
elessair	0:f269e3021894	20	*/
elessair	0:f269e3021894	21
elessair	0:f269e3021894	22	#if !defined(MBEDTLS_CONFIG_FILE)
elessair	0:f269e3021894	23	#include "mbedtls/config.h"
elessair	0:f269e3021894	24	#else
elessair	0:f269e3021894	25	#include MBEDTLS_CONFIG_FILE
elessair	0:f269e3021894	26	#endif
elessair	0:f269e3021894	27
elessair	0:f269e3021894	28	#if defined(MBEDTLS_SSL_CLI_C)
elessair	0:f269e3021894	29
elessair	0:f269e3021894	30	#if defined(MBEDTLS_PLATFORM_C)
elessair	0:f269e3021894	31	#include "mbedtls/platform.h"
elessair	0:f269e3021894	32	#else
elessair	0:f269e3021894	33	#include <stdlib.h>
elessair	0:f269e3021894	34	#define mbedtls_calloc calloc
elessair	0:f269e3021894	35	#define mbedtls_free free
elessair	0:f269e3021894	36	#endif
elessair	0:f269e3021894	37
elessair	0:f269e3021894	38	#include "mbedtls/debug.h"
elessair	0:f269e3021894	39	#include "mbedtls/ssl.h"
elessair	0:f269e3021894	40	#include "mbedtls/ssl_internal.h"
elessair	0:f269e3021894	41
elessair	0:f269e3021894	42	#include <string.h>
elessair	0:f269e3021894	43
elessair	0:f269e3021894	44	#include <stdint.h>
elessair	0:f269e3021894	45
elessair	0:f269e3021894	46	#if defined(MBEDTLS_HAVE_TIME)
elessair	0:f269e3021894	47	#include "mbedtls/platform_time.h"
elessair	0:f269e3021894	48	#endif
elessair	0:f269e3021894	49
elessair	0:f269e3021894	50	#if defined(MBEDTLS_SSL_SESSION_TICKETS)
elessair	0:f269e3021894	51	/* Implementation that should never be optimized out by the compiler */
elessair	0:f269e3021894	52	static void mbedtls_zeroize( void *v, size_t n ) {
elessair	0:f269e3021894	53	volatile unsigned char p = v; while( n-- ) p++ = 0;
elessair	0:f269e3021894	54	}
elessair	0:f269e3021894	55	#endif
elessair	0:f269e3021894	56
elessair	0:f269e3021894	57	#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
elessair	0:f269e3021894	58	static void ssl_write_hostname_ext( mbedtls_ssl_context *ssl,
elessair	0:f269e3021894	59	unsigned char *buf,
elessair	0:f269e3021894	60	size_t *olen )
elessair	0:f269e3021894	61	{
elessair	0:f269e3021894	62	unsigned char *p = buf;
elessair	0:f269e3021894	63	const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_MAX_CONTENT_LEN;
elessair	0:f269e3021894	64	size_t hostname_len;
elessair	0:f269e3021894	65
elessair	0:f269e3021894	66	*olen = 0;
elessair	0:f269e3021894	67
elessair	0:f269e3021894	68	if( ssl->hostname == NULL )
elessair	0:f269e3021894	69	return;
elessair	0:f269e3021894	70
elessair	0:f269e3021894	71	MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, adding server name extension: %s",
elessair	0:f269e3021894	72	ssl->hostname ) );
elessair	0:f269e3021894	73
elessair	0:f269e3021894	74	hostname_len = strlen( ssl->hostname );
elessair	0:f269e3021894	75
elessair	0:f269e3021894	76	if( end < p \|\| (size_t)( end - p ) < hostname_len + 9 )
elessair	0:f269e3021894	77	{
elessair	0:f269e3021894	78	MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small" ) );
elessair	0:f269e3021894	79	return;
elessair	0:f269e3021894	80	}
elessair	0:f269e3021894	81
elessair	0:f269e3021894	82	/*
elessair	0:f269e3021894	83	* struct {
elessair	0:f269e3021894	84	* NameType name_type;
elessair	0:f269e3021894	85	* select (name_type) {
elessair	0:f269e3021894	86	* case host_name: HostName;
elessair	0:f269e3021894	87	* } name;
elessair	0:f269e3021894	88	* } ServerName;
elessair	0:f269e3021894	89	*
elessair	0:f269e3021894	90	* enum {
elessair	0:f269e3021894	91	* host_name(0), (255)
elessair	0:f269e3021894	92	* } NameType;
elessair	0:f269e3021894	93	*
elessair	0:f269e3021894	94	* opaque HostName<1..2^16-1>;
elessair	0:f269e3021894	95	*
elessair	0:f269e3021894	96	* struct {
elessair	0:f269e3021894	97	* ServerName server_name_list<1..2^16-1>
elessair	0:f269e3021894	98	* } ServerNameList;
elessair	0:f269e3021894	99	*/
elessair	0:f269e3021894	100	*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SERVERNAME >> 8 ) & 0xFF );
elessair	0:f269e3021894	101	*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SERVERNAME ) & 0xFF );
elessair	0:f269e3021894	102
elessair	0:f269e3021894	103	*p++ = (unsigned char)( ( (hostname_len + 5) >> 8 ) & 0xFF );
elessair	0:f269e3021894	104	*p++ = (unsigned char)( ( (hostname_len + 5) ) & 0xFF );
elessair	0:f269e3021894	105
elessair	0:f269e3021894	106	*p++ = (unsigned char)( ( (hostname_len + 3) >> 8 ) & 0xFF );
elessair	0:f269e3021894	107	*p++ = (unsigned char)( ( (hostname_len + 3) ) & 0xFF );
elessair	0:f269e3021894	108
elessair	0:f269e3021894	109	*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SERVERNAME_HOSTNAME ) & 0xFF );
elessair	0:f269e3021894	110	*p++ = (unsigned char)( ( hostname_len >> 8 ) & 0xFF );
elessair	0:f269e3021894	111	*p++ = (unsigned char)( ( hostname_len ) & 0xFF );
elessair	0:f269e3021894	112
elessair	0:f269e3021894	113	memcpy( p, ssl->hostname, hostname_len );
elessair	0:f269e3021894	114
elessair	0:f269e3021894	115	*olen = hostname_len + 9;
elessair	0:f269e3021894	116	}
elessair	0:f269e3021894	117	#endif /* MBEDTLS_SSL_SERVER_NAME_INDICATION */
elessair	0:f269e3021894	118
elessair	0:f269e3021894	119	#if defined(MBEDTLS_SSL_RENEGOTIATION)
elessair	0:f269e3021894	120	static void ssl_write_renegotiation_ext( mbedtls_ssl_context *ssl,
elessair	0:f269e3021894	121	unsigned char *buf,
elessair	0:f269e3021894	122	size_t *olen )
elessair	0:f269e3021894	123	{
elessair	0:f269e3021894	124	unsigned char *p = buf;
elessair	0:f269e3021894	125	const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_MAX_CONTENT_LEN;
elessair	0:f269e3021894	126
elessair	0:f269e3021894	127	*olen = 0;
elessair	0:f269e3021894	128
elessair	0:f269e3021894	129	if( ssl->renego_status != MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS )
elessair	0:f269e3021894	130	return;
elessair	0:f269e3021894	131
elessair	0:f269e3021894	132	MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, adding renegotiation extension" ) );
elessair	0:f269e3021894	133
elessair	0:f269e3021894	134	if( end < p \|\| (size_t)( end - p ) < 5 + ssl->verify_data_len )
elessair	0:f269e3021894	135	{
elessair	0:f269e3021894	136	MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small" ) );
elessair	0:f269e3021894	137	return;
elessair	0:f269e3021894	138	}
elessair	0:f269e3021894	139
elessair	0:f269e3021894	140	/*
elessair	0:f269e3021894	141	* Secure renegotiation
elessair	0:f269e3021894	142	*/
elessair	0:f269e3021894	143	*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_RENEGOTIATION_INFO >> 8 ) & 0xFF );
elessair	0:f269e3021894	144	*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_RENEGOTIATION_INFO ) & 0xFF );
elessair	0:f269e3021894	145
elessair	0:f269e3021894	146	*p++ = 0x00;
elessair	0:f269e3021894	147	*p++ = ( ssl->verify_data_len + 1 ) & 0xFF;
elessair	0:f269e3021894	148	*p++ = ssl->verify_data_len & 0xFF;
elessair	0:f269e3021894	149
elessair	0:f269e3021894	150	memcpy( p, ssl->own_verify_data, ssl->verify_data_len );
elessair	0:f269e3021894	151
elessair	0:f269e3021894	152	*olen = 5 + ssl->verify_data_len;
elessair	0:f269e3021894	153	}
elessair	0:f269e3021894	154	#endif /* MBEDTLS_SSL_RENEGOTIATION */
elessair	0:f269e3021894	155
elessair	0:f269e3021894	156	/*
elessair	0:f269e3021894	157	* Only if we handle at least one key exchange that needs signatures.
elessair	0:f269e3021894	158	*/
elessair	0:f269e3021894	159	#if defined(MBEDTLS_SSL_PROTO_TLS1_2) && \
elessair	0:f269e3021894	160	defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED)
elessair	0:f269e3021894	161	static void ssl_write_signature_algorithms_ext( mbedtls_ssl_context *ssl,
elessair	0:f269e3021894	162	unsigned char *buf,
elessair	0:f269e3021894	163	size_t *olen )
elessair	0:f269e3021894	164	{
elessair	0:f269e3021894	165	unsigned char *p = buf;
elessair	0:f269e3021894	166	const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_MAX_CONTENT_LEN;
elessair	0:f269e3021894	167	size_t sig_alg_len = 0;
elessair	0:f269e3021894	168	const int *md;
elessair	0:f269e3021894	169	#if defined(MBEDTLS_RSA_C) \|\| defined(MBEDTLS_ECDSA_C)
elessair	0:f269e3021894	170	unsigned char *sig_alg_list = buf + 6;
elessair	0:f269e3021894	171	#endif
elessair	0:f269e3021894	172
elessair	0:f269e3021894	173	*olen = 0;
elessair	0:f269e3021894	174
elessair	0:f269e3021894	175	if( ssl->conf->max_minor_ver != MBEDTLS_SSL_MINOR_VERSION_3 )
elessair	0:f269e3021894	176	return;
elessair	0:f269e3021894	177
elessair	0:f269e3021894	178	MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, adding signature_algorithms extension" ) );
elessair	0:f269e3021894	179
elessair	0:f269e3021894	180	for( md = ssl->conf->sig_hashes; *md != MBEDTLS_MD_NONE; md++ )
elessair	0:f269e3021894	181	{
elessair	0:f269e3021894	182	#if defined(MBEDTLS_ECDSA_C)
elessair	0:f269e3021894	183	sig_alg_len += 2;
elessair	0:f269e3021894	184	#endif
elessair	0:f269e3021894	185	#if defined(MBEDTLS_RSA_C)
elessair	0:f269e3021894	186	sig_alg_len += 2;
elessair	0:f269e3021894	187	#endif
elessair	0:f269e3021894	188	}
elessair	0:f269e3021894	189
elessair	0:f269e3021894	190	if( end < p \|\| (size_t)( end - p ) < sig_alg_len + 6 )
elessair	0:f269e3021894	191	{
elessair	0:f269e3021894	192	MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small" ) );
elessair	0:f269e3021894	193	return;
elessair	0:f269e3021894	194	}
elessair	0:f269e3021894	195
elessair	0:f269e3021894	196	/*
elessair	0:f269e3021894	197	* Prepare signature_algorithms extension (TLS 1.2)
elessair	0:f269e3021894	198	*/
elessair	0:f269e3021894	199	sig_alg_len = 0;
elessair	0:f269e3021894	200
elessair	0:f269e3021894	201	for( md = ssl->conf->sig_hashes; *md != MBEDTLS_MD_NONE; md++ )
elessair	0:f269e3021894	202	{
elessair	0:f269e3021894	203	#if defined(MBEDTLS_ECDSA_C)
elessair	0:f269e3021894	204	sig_alg_list[sig_alg_len++] = mbedtls_ssl_hash_from_md_alg( *md );
elessair	0:f269e3021894	205	sig_alg_list[sig_alg_len++] = MBEDTLS_SSL_SIG_ECDSA;
elessair	0:f269e3021894	206	#endif
elessair	0:f269e3021894	207	#if defined(MBEDTLS_RSA_C)
elessair	0:f269e3021894	208	sig_alg_list[sig_alg_len++] = mbedtls_ssl_hash_from_md_alg( *md );
elessair	0:f269e3021894	209	sig_alg_list[sig_alg_len++] = MBEDTLS_SSL_SIG_RSA;
elessair	0:f269e3021894	210	#endif
elessair	0:f269e3021894	211	}
elessair	0:f269e3021894	212
elessair	0:f269e3021894	213	/*
elessair	0:f269e3021894	214	* enum {
elessair	0:f269e3021894	215	* none(0), md5(1), sha1(2), sha224(3), sha256(4), sha384(5),
elessair	0:f269e3021894	216	* sha512(6), (255)
elessair	0:f269e3021894	217	* } HashAlgorithm;
elessair	0:f269e3021894	218	*
elessair	0:f269e3021894	219	* enum { anonymous(0), rsa(1), dsa(2), ecdsa(3), (255) }
elessair	0:f269e3021894	220	* SignatureAlgorithm;
elessair	0:f269e3021894	221	*
elessair	0:f269e3021894	222	* struct {
elessair	0:f269e3021894	223	* HashAlgorithm hash;
elessair	0:f269e3021894	224	* SignatureAlgorithm signature;
elessair	0:f269e3021894	225	* } SignatureAndHashAlgorithm;
elessair	0:f269e3021894	226	*
elessair	0:f269e3021894	227	* SignatureAndHashAlgorithm
elessair	0:f269e3021894	228	* supported_signature_algorithms<2..2^16-2>;
elessair	0:f269e3021894	229	*/
elessair	0:f269e3021894	230	*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SIG_ALG >> 8 ) & 0xFF );
elessair	0:f269e3021894	231	*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SIG_ALG ) & 0xFF );
elessair	0:f269e3021894	232
elessair	0:f269e3021894	233	*p++ = (unsigned char)( ( ( sig_alg_len + 2 ) >> 8 ) & 0xFF );
elessair	0:f269e3021894	234	*p++ = (unsigned char)( ( ( sig_alg_len + 2 ) ) & 0xFF );
elessair	0:f269e3021894	235
elessair	0:f269e3021894	236	*p++ = (unsigned char)( ( sig_alg_len >> 8 ) & 0xFF );
elessair	0:f269e3021894	237	*p++ = (unsigned char)( ( sig_alg_len ) & 0xFF );
elessair	0:f269e3021894	238
elessair	0:f269e3021894	239	*olen = 6 + sig_alg_len;
elessair	0:f269e3021894	240	}
elessair	0:f269e3021894	241	#endif /* MBEDTLS_SSL_PROTO_TLS1_2 &&
elessair	0:f269e3021894	242	MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED */
elessair	0:f269e3021894	243
elessair	0:f269e3021894	244	#if defined(MBEDTLS_ECDH_C) \|\| defined(MBEDTLS_ECDSA_C) \|\| \
elessair	0:f269e3021894	245	defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
elessair	0:f269e3021894	246	static void ssl_write_supported_elliptic_curves_ext( mbedtls_ssl_context *ssl,
elessair	0:f269e3021894	247	unsigned char *buf,
elessair	0:f269e3021894	248	size_t *olen )
elessair	0:f269e3021894	249	{
elessair	0:f269e3021894	250	unsigned char *p = buf;
elessair	0:f269e3021894	251	const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_MAX_CONTENT_LEN;
elessair	0:f269e3021894	252	unsigned char *elliptic_curve_list = p + 6;
elessair	0:f269e3021894	253	size_t elliptic_curve_len = 0;
elessair	0:f269e3021894	254	const mbedtls_ecp_curve_info *info;
elessair	0:f269e3021894	255	#if defined(MBEDTLS_ECP_C)
elessair	0:f269e3021894	256	const mbedtls_ecp_group_id *grp_id;
elessair	0:f269e3021894	257	#else
elessair	0:f269e3021894	258	((void) ssl);
elessair	0:f269e3021894	259	#endif
elessair	0:f269e3021894	260
elessair	0:f269e3021894	261	*olen = 0;
elessair	0:f269e3021894	262
elessair	0:f269e3021894	263	MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, adding supported_elliptic_curves extension" ) );
elessair	0:f269e3021894	264
elessair	0:f269e3021894	265	#if defined(MBEDTLS_ECP_C)
elessair	0:f269e3021894	266	for( grp_id = ssl->conf->curve_list; *grp_id != MBEDTLS_ECP_DP_NONE; grp_id++ )
elessair	0:f269e3021894	267	{
elessair	0:f269e3021894	268	info = mbedtls_ecp_curve_info_from_grp_id( *grp_id );
elessair	0:f269e3021894	269	#else
elessair	0:f269e3021894	270	for( info = mbedtls_ecp_curve_list(); info->grp_id != MBEDTLS_ECP_DP_NONE; info++ )
elessair	0:f269e3021894	271	{
elessair	0:f269e3021894	272	#endif
elessair	0:f269e3021894	273	if( info == NULL )
elessair	0:f269e3021894	274	{
elessair	0:f269e3021894	275	MBEDTLS_SSL_DEBUG_MSG( 1, ( "invalid curve in ssl configuration" ) );
elessair	0:f269e3021894	276	return;
elessair	0:f269e3021894	277	}
elessair	0:f269e3021894	278
elessair	0:f269e3021894	279	elliptic_curve_len += 2;
elessair	0:f269e3021894	280	}
elessair	0:f269e3021894	281
elessair	0:f269e3021894	282	if( end < p \|\| (size_t)( end - p ) < 6 + elliptic_curve_len )
elessair	0:f269e3021894	283	{
elessair	0:f269e3021894	284	MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small" ) );
elessair	0:f269e3021894	285	return;
elessair	0:f269e3021894	286	}
elessair	0:f269e3021894	287
elessair	0:f269e3021894	288	elliptic_curve_len = 0;
elessair	0:f269e3021894	289
elessair	0:f269e3021894	290	#if defined(MBEDTLS_ECP_C)
elessair	0:f269e3021894	291	for( grp_id = ssl->conf->curve_list; *grp_id != MBEDTLS_ECP_DP_NONE; grp_id++ )
elessair	0:f269e3021894	292	{
elessair	0:f269e3021894	293	info = mbedtls_ecp_curve_info_from_grp_id( *grp_id );
elessair	0:f269e3021894	294	#else
elessair	0:f269e3021894	295	for( info = mbedtls_ecp_curve_list(); info->grp_id != MBEDTLS_ECP_DP_NONE; info++ )
elessair	0:f269e3021894	296	{
elessair	0:f269e3021894	297	#endif
elessair	0:f269e3021894	298	elliptic_curve_list[elliptic_curve_len++] = info->tls_id >> 8;
elessair	0:f269e3021894	299	elliptic_curve_list[elliptic_curve_len++] = info->tls_id & 0xFF;
elessair	0:f269e3021894	300	}
elessair	0:f269e3021894	301
elessair	0:f269e3021894	302	if( elliptic_curve_len == 0 )
elessair	0:f269e3021894	303	return;
elessair	0:f269e3021894	304
elessair	0:f269e3021894	305	*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SUPPORTED_ELLIPTIC_CURVES >> 8 ) & 0xFF );
elessair	0:f269e3021894	306	*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SUPPORTED_ELLIPTIC_CURVES ) & 0xFF );
elessair	0:f269e3021894	307
elessair	0:f269e3021894	308	*p++ = (unsigned char)( ( ( elliptic_curve_len + 2 ) >> 8 ) & 0xFF );
elessair	0:f269e3021894	309	*p++ = (unsigned char)( ( ( elliptic_curve_len + 2 ) ) & 0xFF );
elessair	0:f269e3021894	310
elessair	0:f269e3021894	311	*p++ = (unsigned char)( ( ( elliptic_curve_len ) >> 8 ) & 0xFF );
elessair	0:f269e3021894	312	*p++ = (unsigned char)( ( ( elliptic_curve_len ) ) & 0xFF );
elessair	0:f269e3021894	313
elessair	0:f269e3021894	314	*olen = 6 + elliptic_curve_len;
elessair	0:f269e3021894	315	}
elessair	0:f269e3021894	316
elessair	0:f269e3021894	317	static void ssl_write_supported_point_formats_ext( mbedtls_ssl_context *ssl,
elessair	0:f269e3021894	318	unsigned char *buf,
elessair	0:f269e3021894	319	size_t *olen )
elessair	0:f269e3021894	320	{
elessair	0:f269e3021894	321	unsigned char *p = buf;
elessair	0:f269e3021894	322	const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_MAX_CONTENT_LEN;
elessair	0:f269e3021894	323
elessair	0:f269e3021894	324	*olen = 0;
elessair	0:f269e3021894	325
elessair	0:f269e3021894	326	MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, adding supported_point_formats extension" ) );
elessair	0:f269e3021894	327
elessair	0:f269e3021894	328	if( end < p \|\| (size_t)( end - p ) < 6 )
elessair	0:f269e3021894	329	{
elessair	0:f269e3021894	330	MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small" ) );
elessair	0:f269e3021894	331	return;
elessair	0:f269e3021894	332	}
elessair	0:f269e3021894	333
elessair	0:f269e3021894	334	*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SUPPORTED_POINT_FORMATS >> 8 ) & 0xFF );
elessair	0:f269e3021894	335	*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SUPPORTED_POINT_FORMATS ) & 0xFF );
elessair	0:f269e3021894	336
elessair	0:f269e3021894	337	*p++ = 0x00;
elessair	0:f269e3021894	338	*p++ = 2;
elessair	0:f269e3021894	339
elessair	0:f269e3021894	340	*p++ = 1;
elessair	0:f269e3021894	341	*p++ = MBEDTLS_ECP_PF_UNCOMPRESSED;
elessair	0:f269e3021894	342
elessair	0:f269e3021894	343	*olen = 6;
elessair	0:f269e3021894	344	}
elessair	0:f269e3021894	345	#endif /* MBEDTLS_ECDH_C \|\| MBEDTLS_ECDSA_C \|\|
elessair	0:f269e3021894	346	MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */
elessair	0:f269e3021894	347
elessair	0:f269e3021894	348	#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
elessair	0:f269e3021894	349	static void ssl_write_ecjpake_kkpp_ext( mbedtls_ssl_context *ssl,
elessair	0:f269e3021894	350	unsigned char *buf,
elessair	0:f269e3021894	351	size_t *olen )
elessair	0:f269e3021894	352	{
elessair	0:f269e3021894	353	int ret;
elessair	0:f269e3021894	354	unsigned char *p = buf;
elessair	0:f269e3021894	355	const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_MAX_CONTENT_LEN;
elessair	0:f269e3021894	356	size_t kkpp_len;
elessair	0:f269e3021894	357
elessair	0:f269e3021894	358	*olen = 0;
elessair	0:f269e3021894	359
elessair	0:f269e3021894	360	/* Skip costly extension if we can't use EC J-PAKE anyway */
elessair	0:f269e3021894	361	if( mbedtls_ecjpake_check( &ssl->handshake->ecjpake_ctx ) != 0 )
elessair	0:f269e3021894	362	return;
elessair	0:f269e3021894	363
elessair	0:f269e3021894	364	MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, adding ecjpake_kkpp extension" ) );
elessair	0:f269e3021894	365
elessair	0:f269e3021894	366	if( end - p < 4 )
elessair	0:f269e3021894	367	{
elessair	0:f269e3021894	368	MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small" ) );
elessair	0:f269e3021894	369	return;
elessair	0:f269e3021894	370	}
elessair	0:f269e3021894	371
elessair	0:f269e3021894	372	*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_ECJPAKE_KKPP >> 8 ) & 0xFF );
elessair	0:f269e3021894	373	*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_ECJPAKE_KKPP ) & 0xFF );
elessair	0:f269e3021894	374
elessair	0:f269e3021894	375	/*
elessair	0:f269e3021894	376	* We may need to send ClientHello multiple times for Hello verification.
elessair	0:f269e3021894	377	* We don't want to compute fresh values every time (both for performance
elessair	0:f269e3021894	378	* and consistency reasons), so cache the extension content.
elessair	0:f269e3021894	379	*/
elessair	0:f269e3021894	380	if( ssl->handshake->ecjpake_cache == NULL \|\|
elessair	0:f269e3021894	381	ssl->handshake->ecjpake_cache_len == 0 )
elessair	0:f269e3021894	382	{
elessair	0:f269e3021894	383	MBEDTLS_SSL_DEBUG_MSG( 3, ( "generating new ecjpake parameters" ) );
elessair	0:f269e3021894	384
elessair	0:f269e3021894	385	ret = mbedtls_ecjpake_write_round_one( &ssl->handshake->ecjpake_ctx,
elessair	0:f269e3021894	386	p + 2, end - p - 2, &kkpp_len,
elessair	0:f269e3021894	387	ssl->conf->f_rng, ssl->conf->p_rng );
elessair	0:f269e3021894	388	if( ret != 0 )
elessair	0:f269e3021894	389	{
elessair	0:f269e3021894	390	MBEDTLS_SSL_DEBUG_RET( 1 , "mbedtls_ecjpake_write_round_one", ret );
elessair	0:f269e3021894	391	return;
elessair	0:f269e3021894	392	}
elessair	0:f269e3021894	393
elessair	0:f269e3021894	394	ssl->handshake->ecjpake_cache = mbedtls_calloc( 1, kkpp_len );
elessair	0:f269e3021894	395	if( ssl->handshake->ecjpake_cache == NULL )
elessair	0:f269e3021894	396	{
elessair	0:f269e3021894	397	MBEDTLS_SSL_DEBUG_MSG( 1, ( "allocation failed" ) );
elessair	0:f269e3021894	398	return;
elessair	0:f269e3021894	399	}
elessair	0:f269e3021894	400
elessair	0:f269e3021894	401	memcpy( ssl->handshake->ecjpake_cache, p + 2, kkpp_len );
elessair	0:f269e3021894	402	ssl->handshake->ecjpake_cache_len = kkpp_len;
elessair	0:f269e3021894	403	}
elessair	0:f269e3021894	404	else
elessair	0:f269e3021894	405	{
elessair	0:f269e3021894	406	MBEDTLS_SSL_DEBUG_MSG( 3, ( "re-using cached ecjpake parameters" ) );
elessair	0:f269e3021894	407
elessair	0:f269e3021894	408	kkpp_len = ssl->handshake->ecjpake_cache_len;
elessair	0:f269e3021894	409
elessair	0:f269e3021894	410	if( (size_t)( end - p - 2 ) < kkpp_len )
elessair	0:f269e3021894	411	{
elessair	0:f269e3021894	412	MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small" ) );
elessair	0:f269e3021894	413	return;
elessair	0:f269e3021894	414	}
elessair	0:f269e3021894	415
elessair	0:f269e3021894	416	memcpy( p + 2, ssl->handshake->ecjpake_cache, kkpp_len );
elessair	0:f269e3021894	417	}
elessair	0:f269e3021894	418
elessair	0:f269e3021894	419	*p++ = (unsigned char)( ( kkpp_len >> 8 ) & 0xFF );
elessair	0:f269e3021894	420	*p++ = (unsigned char)( ( kkpp_len ) & 0xFF );
elessair	0:f269e3021894	421
elessair	0:f269e3021894	422	*olen = kkpp_len + 4;
elessair	0:f269e3021894	423	}
elessair	0:f269e3021894	424	#endif /* MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */
elessair	0:f269e3021894	425
elessair	0:f269e3021894	426	#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
elessair	0:f269e3021894	427	static void ssl_write_max_fragment_length_ext( mbedtls_ssl_context *ssl,
elessair	0:f269e3021894	428	unsigned char *buf,
elessair	0:f269e3021894	429	size_t *olen )
elessair	0:f269e3021894	430	{
elessair	0:f269e3021894	431	unsigned char *p = buf;
elessair	0:f269e3021894	432	const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_MAX_CONTENT_LEN;
elessair	0:f269e3021894	433
elessair	0:f269e3021894	434	*olen = 0;
elessair	0:f269e3021894	435
elessair	0:f269e3021894	436	if( ssl->conf->mfl_code == MBEDTLS_SSL_MAX_FRAG_LEN_NONE ) {
elessair	0:f269e3021894	437	return;
elessair	0:f269e3021894	438	}
elessair	0:f269e3021894	439
elessair	0:f269e3021894	440	MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, adding max_fragment_length extension" ) );
elessair	0:f269e3021894	441
elessair	0:f269e3021894	442	if( end < p \|\| (size_t)( end - p ) < 5 )
elessair	0:f269e3021894	443	{
elessair	0:f269e3021894	444	MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small" ) );
elessair	0:f269e3021894	445	return;
elessair	0:f269e3021894	446	}
elessair	0:f269e3021894	447
elessair	0:f269e3021894	448	*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_MAX_FRAGMENT_LENGTH >> 8 ) & 0xFF );
elessair	0:f269e3021894	449	*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_MAX_FRAGMENT_LENGTH ) & 0xFF );
elessair	0:f269e3021894	450
elessair	0:f269e3021894	451	*p++ = 0x00;
elessair	0:f269e3021894	452	*p++ = 1;
elessair	0:f269e3021894	453
elessair	0:f269e3021894	454	*p++ = ssl->conf->mfl_code;
elessair	0:f269e3021894	455
elessair	0:f269e3021894	456	*olen = 5;
elessair	0:f269e3021894	457	}
elessair	0:f269e3021894	458	#endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */
elessair	0:f269e3021894	459
elessair	0:f269e3021894	460	#if defined(MBEDTLS_SSL_TRUNCATED_HMAC)
elessair	0:f269e3021894	461	static void ssl_write_truncated_hmac_ext( mbedtls_ssl_context *ssl,
elessair	0:f269e3021894	462	unsigned char buf, size_t olen )
elessair	0:f269e3021894	463	{
elessair	0:f269e3021894	464	unsigned char *p = buf;
elessair	0:f269e3021894	465	const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_MAX_CONTENT_LEN;
elessair	0:f269e3021894	466
elessair	0:f269e3021894	467	*olen = 0;
elessair	0:f269e3021894	468
elessair	0:f269e3021894	469	if( ssl->conf->trunc_hmac == MBEDTLS_SSL_TRUNC_HMAC_DISABLED )
elessair	0:f269e3021894	470	{
elessair	0:f269e3021894	471	return;
elessair	0:f269e3021894	472	}
elessair	0:f269e3021894	473
elessair	0:f269e3021894	474	MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, adding truncated_hmac extension" ) );
elessair	0:f269e3021894	475
elessair	0:f269e3021894	476	if( end < p \|\| (size_t)( end - p ) < 4 )
elessair	0:f269e3021894	477	{
elessair	0:f269e3021894	478	MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small" ) );
elessair	0:f269e3021894	479	return;
elessair	0:f269e3021894	480	}
elessair	0:f269e3021894	481
elessair	0:f269e3021894	482	*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_TRUNCATED_HMAC >> 8 ) & 0xFF );
elessair	0:f269e3021894	483	*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_TRUNCATED_HMAC ) & 0xFF );
elessair	0:f269e3021894	484
elessair	0:f269e3021894	485	*p++ = 0x00;
elessair	0:f269e3021894	486	*p++ = 0x00;
elessair	0:f269e3021894	487
elessair	0:f269e3021894	488	*olen = 4;
elessair	0:f269e3021894	489	}
elessair	0:f269e3021894	490	#endif /* MBEDTLS_SSL_TRUNCATED_HMAC */
elessair	0:f269e3021894	491
elessair	0:f269e3021894	492	#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
elessair	0:f269e3021894	493	static void ssl_write_encrypt_then_mac_ext( mbedtls_ssl_context *ssl,
elessair	0:f269e3021894	494	unsigned char buf, size_t olen )
elessair	0:f269e3021894	495	{
elessair	0:f269e3021894	496	unsigned char *p = buf;
elessair	0:f269e3021894	497	const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_MAX_CONTENT_LEN;
elessair	0:f269e3021894	498
elessair	0:f269e3021894	499	*olen = 0;
elessair	0:f269e3021894	500
elessair	0:f269e3021894	501	if( ssl->conf->encrypt_then_mac == MBEDTLS_SSL_ETM_DISABLED \|\|
elessair	0:f269e3021894	502	ssl->conf->max_minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 )
elessair	0:f269e3021894	503	{
elessair	0:f269e3021894	504	return;
elessair	0:f269e3021894	505	}
elessair	0:f269e3021894	506
elessair	0:f269e3021894	507	MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, adding encrypt_then_mac "
elessair	0:f269e3021894	508	"extension" ) );
elessair	0:f269e3021894	509
elessair	0:f269e3021894	510	if( end < p \|\| (size_t)( end - p ) < 4 )
elessair	0:f269e3021894	511	{
elessair	0:f269e3021894	512	MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small" ) );
elessair	0:f269e3021894	513	return;
elessair	0:f269e3021894	514	}
elessair	0:f269e3021894	515
elessair	0:f269e3021894	516	*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_ENCRYPT_THEN_MAC >> 8 ) & 0xFF );
elessair	0:f269e3021894	517	*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_ENCRYPT_THEN_MAC ) & 0xFF );
elessair	0:f269e3021894	518
elessair	0:f269e3021894	519	*p++ = 0x00;
elessair	0:f269e3021894	520	*p++ = 0x00;
elessair	0:f269e3021894	521
elessair	0:f269e3021894	522	*olen = 4;
elessair	0:f269e3021894	523	}
elessair	0:f269e3021894	524	#endif /* MBEDTLS_SSL_ENCRYPT_THEN_MAC */
elessair	0:f269e3021894	525
elessair	0:f269e3021894	526	#if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET)
elessair	0:f269e3021894	527	static void ssl_write_extended_ms_ext( mbedtls_ssl_context *ssl,
elessair	0:f269e3021894	528	unsigned char buf, size_t olen )
elessair	0:f269e3021894	529	{
elessair	0:f269e3021894	530	unsigned char *p = buf;
elessair	0:f269e3021894	531	const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_MAX_CONTENT_LEN;
elessair	0:f269e3021894	532
elessair	0:f269e3021894	533	*olen = 0;
elessair	0:f269e3021894	534
elessair	0:f269e3021894	535	if( ssl->conf->extended_ms == MBEDTLS_SSL_EXTENDED_MS_DISABLED \|\|
elessair	0:f269e3021894	536	ssl->conf->max_minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 )
elessair	0:f269e3021894	537	{
elessair	0:f269e3021894	538	return;
elessair	0:f269e3021894	539	}
elessair	0:f269e3021894	540
elessair	0:f269e3021894	541	MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, adding extended_master_secret "
elessair	0:f269e3021894	542	"extension" ) );
elessair	0:f269e3021894	543
elessair	0:f269e3021894	544	if( end < p \|\| (size_t)( end - p ) < 4 )
elessair	0:f269e3021894	545	{
elessair	0:f269e3021894	546	MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small" ) );
elessair	0:f269e3021894	547	return;
elessair	0:f269e3021894	548	}
elessair	0:f269e3021894	549
elessair	0:f269e3021894	550	*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_EXTENDED_MASTER_SECRET >> 8 ) & 0xFF );
elessair	0:f269e3021894	551	*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_EXTENDED_MASTER_SECRET ) & 0xFF );
elessair	0:f269e3021894	552
elessair	0:f269e3021894	553	*p++ = 0x00;
elessair	0:f269e3021894	554	*p++ = 0x00;
elessair	0:f269e3021894	555
elessair	0:f269e3021894	556	*olen = 4;
elessair	0:f269e3021894	557	}
elessair	0:f269e3021894	558	#endif /* MBEDTLS_SSL_EXTENDED_MASTER_SECRET */
elessair	0:f269e3021894	559
elessair	0:f269e3021894	560	#if defined(MBEDTLS_SSL_SESSION_TICKETS)
elessair	0:f269e3021894	561	static void ssl_write_session_ticket_ext( mbedtls_ssl_context *ssl,
elessair	0:f269e3021894	562	unsigned char buf, size_t olen )
elessair	0:f269e3021894	563	{
elessair	0:f269e3021894	564	unsigned char *p = buf;
elessair	0:f269e3021894	565	const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_MAX_CONTENT_LEN;
elessair	0:f269e3021894	566	size_t tlen = ssl->session_negotiate->ticket_len;
elessair	0:f269e3021894	567
elessair	0:f269e3021894	568	*olen = 0;
elessair	0:f269e3021894	569
elessair	0:f269e3021894	570	if( ssl->conf->session_tickets == MBEDTLS_SSL_SESSION_TICKETS_DISABLED )
elessair	0:f269e3021894	571	{
elessair	0:f269e3021894	572	return;
elessair	0:f269e3021894	573	}
elessair	0:f269e3021894	574
elessair	0:f269e3021894	575	MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, adding session ticket extension" ) );
elessair	0:f269e3021894	576
elessair	0:f269e3021894	577	if( end < p \|\| (size_t)( end - p ) < 4 + tlen )
elessair	0:f269e3021894	578	{
elessair	0:f269e3021894	579	MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small" ) );
elessair	0:f269e3021894	580	return;
elessair	0:f269e3021894	581	}
elessair	0:f269e3021894	582
elessair	0:f269e3021894	583	*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SESSION_TICKET >> 8 ) & 0xFF );
elessair	0:f269e3021894	584	*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SESSION_TICKET ) & 0xFF );
elessair	0:f269e3021894	585
elessair	0:f269e3021894	586	*p++ = (unsigned char)( ( tlen >> 8 ) & 0xFF );
elessair	0:f269e3021894	587	*p++ = (unsigned char)( ( tlen ) & 0xFF );
elessair	0:f269e3021894	588
elessair	0:f269e3021894	589	*olen = 4;
elessair	0:f269e3021894	590
elessair	0:f269e3021894	591	if( ssl->session_negotiate->ticket == NULL \|\| tlen == 0 )
elessair	0:f269e3021894	592	{
elessair	0:f269e3021894	593	return;
elessair	0:f269e3021894	594	}
elessair	0:f269e3021894	595
elessair	0:f269e3021894	596	MBEDTLS_SSL_DEBUG_MSG( 3, ( "sending session ticket of length %d", tlen ) );
elessair	0:f269e3021894	597
elessair	0:f269e3021894	598	memcpy( p, ssl->session_negotiate->ticket, tlen );
elessair	0:f269e3021894	599
elessair	0:f269e3021894	600	*olen += tlen;
elessair	0:f269e3021894	601	}
elessair	0:f269e3021894	602	#endif /* MBEDTLS_SSL_SESSION_TICKETS */
elessair	0:f269e3021894	603
elessair	0:f269e3021894	604	#if defined(MBEDTLS_SSL_ALPN)
elessair	0:f269e3021894	605	static void ssl_write_alpn_ext( mbedtls_ssl_context *ssl,
elessair	0:f269e3021894	606	unsigned char buf, size_t olen )
elessair	0:f269e3021894	607	{
elessair	0:f269e3021894	608	unsigned char *p = buf;
elessair	0:f269e3021894	609	const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_MAX_CONTENT_LEN;
elessair	0:f269e3021894	610	size_t alpnlen = 0;
elessair	0:f269e3021894	611	const char **cur;
elessair	0:f269e3021894	612
elessair	0:f269e3021894	613	*olen = 0;
elessair	0:f269e3021894	614
elessair	0:f269e3021894	615	if( ssl->conf->alpn_list == NULL )
elessair	0:f269e3021894	616	{
elessair	0:f269e3021894	617	return;
elessair	0:f269e3021894	618	}
elessair	0:f269e3021894	619
elessair	0:f269e3021894	620	MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, adding alpn extension" ) );
elessair	0:f269e3021894	621
elessair	0:f269e3021894	622	for( cur = ssl->conf->alpn_list; *cur != NULL; cur++ )
elessair	0:f269e3021894	623	alpnlen += (unsigned char)( strlen( *cur ) & 0xFF ) + 1;
elessair	0:f269e3021894	624
elessair	0:f269e3021894	625	if( end < p \|\| (size_t)( end - p ) < 6 + alpnlen )
elessair	0:f269e3021894	626	{
elessair	0:f269e3021894	627	MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small" ) );
elessair	0:f269e3021894	628	return;
elessair	0:f269e3021894	629	}
elessair	0:f269e3021894	630
elessair	0:f269e3021894	631	*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_ALPN >> 8 ) & 0xFF );
elessair	0:f269e3021894	632	*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_ALPN ) & 0xFF );
elessair	0:f269e3021894	633
elessair	0:f269e3021894	634	/*
elessair	0:f269e3021894	635	* opaque ProtocolName<1..2^8-1>;
elessair	0:f269e3021894	636	*
elessair	0:f269e3021894	637	* struct {
elessair	0:f269e3021894	638	* ProtocolName protocol_name_list<2..2^16-1>
elessair	0:f269e3021894	639	* } ProtocolNameList;
elessair	0:f269e3021894	640	*/
elessair	0:f269e3021894	641
elessair	0:f269e3021894	642	/* Skip writing extension and list length for now */
elessair	0:f269e3021894	643	p += 4;
elessair	0:f269e3021894	644
elessair	0:f269e3021894	645	for( cur = ssl->conf->alpn_list; *cur != NULL; cur++ )
elessair	0:f269e3021894	646	{
elessair	0:f269e3021894	647	p = (unsigned char)( strlen( cur ) & 0xFF );
elessair	0:f269e3021894	648	memcpy( p + 1, cur, p );
elessair	0:f269e3021894	649	p += 1 + *p;
elessair	0:f269e3021894	650	}
elessair	0:f269e3021894	651
elessair	0:f269e3021894	652	*olen = p - buf;
elessair	0:f269e3021894	653
elessair	0:f269e3021894	654	/* List length = olen - 2 (ext_type) - 2 (ext_len) - 2 (list_len) */
elessair	0:f269e3021894	655	buf[4] = (unsigned char)( ( ( *olen - 6 ) >> 8 ) & 0xFF );
elessair	0:f269e3021894	656	buf[5] = (unsigned char)( ( ( *olen - 6 ) ) & 0xFF );
elessair	0:f269e3021894	657
elessair	0:f269e3021894	658	/* Extension length = olen - 2 (ext_type) - 2 (ext_len) */
elessair	0:f269e3021894	659	buf[2] = (unsigned char)( ( ( *olen - 4 ) >> 8 ) & 0xFF );
elessair	0:f269e3021894	660	buf[3] = (unsigned char)( ( ( *olen - 4 ) ) & 0xFF );
elessair	0:f269e3021894	661	}
elessair	0:f269e3021894	662	#endif /* MBEDTLS_SSL_ALPN */
elessair	0:f269e3021894	663
elessair	0:f269e3021894	664	/*
elessair	0:f269e3021894	665	* Generate random bytes for ClientHello
elessair	0:f269e3021894	666	*/
elessair	0:f269e3021894	667	static int ssl_generate_random( mbedtls_ssl_context *ssl )
elessair	0:f269e3021894	668	{
elessair	0:f269e3021894	669	int ret;
elessair	0:f269e3021894	670	unsigned char *p = ssl->handshake->randbytes;
elessair	0:f269e3021894	671	#if defined(MBEDTLS_HAVE_TIME)
elessair	0:f269e3021894	672	mbedtls_time_t t;
elessair	0:f269e3021894	673	#endif
elessair	0:f269e3021894	674
elessair	0:f269e3021894	675	/*
elessair	0:f269e3021894	676	* When responding to a verify request, MUST reuse random (RFC 6347 4.2.1)
elessair	0:f269e3021894	677	*/
elessair	0:f269e3021894	678	#if defined(MBEDTLS_SSL_PROTO_DTLS)
elessair	0:f269e3021894	679	if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
elessair	0:f269e3021894	680	ssl->handshake->verify_cookie != NULL )
elessair	0:f269e3021894	681	{
elessair	0:f269e3021894	682	return( 0 );
elessair	0:f269e3021894	683	}
elessair	0:f269e3021894	684	#endif
elessair	0:f269e3021894	685
elessair	0:f269e3021894	686	#if defined(MBEDTLS_HAVE_TIME)
elessair	0:f269e3021894	687	t = mbedtls_time( NULL );
elessair	0:f269e3021894	688	*p++ = (unsigned char)( t >> 24 );
elessair	0:f269e3021894	689	*p++ = (unsigned char)( t >> 16 );
elessair	0:f269e3021894	690	*p++ = (unsigned char)( t >> 8 );
elessair	0:f269e3021894	691	*p++ = (unsigned char)( t );
elessair	0:f269e3021894	692
elessair	0:f269e3021894	693	MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, current time: %lu", t ) );
elessair	0:f269e3021894	694	#else
elessair	0:f269e3021894	695	if( ( ret = ssl->conf->f_rng( ssl->conf->p_rng, p, 4 ) ) != 0 )
elessair	0:f269e3021894	696	return( ret );
elessair	0:f269e3021894	697
elessair	0:f269e3021894	698	p += 4;
elessair	0:f269e3021894	699	#endif /* MBEDTLS_HAVE_TIME */
elessair	0:f269e3021894	700
elessair	0:f269e3021894	701	if( ( ret = ssl->conf->f_rng( ssl->conf->p_rng, p, 28 ) ) != 0 )
elessair	0:f269e3021894	702	return( ret );
elessair	0:f269e3021894	703
elessair	0:f269e3021894	704	return( 0 );
elessair	0:f269e3021894	705	}
elessair	0:f269e3021894	706
elessair	0:f269e3021894	707	static int ssl_write_client_hello( mbedtls_ssl_context *ssl )
elessair	0:f269e3021894	708	{
elessair	0:f269e3021894	709	int ret;
elessair	0:f269e3021894	710	size_t i, n, olen, ext_len = 0;
elessair	0:f269e3021894	711	unsigned char *buf;
elessair	0:f269e3021894	712	unsigned char p, q;
elessair	0:f269e3021894	713	unsigned char offer_compress;
elessair	0:f269e3021894	714	const int *ciphersuites;
elessair	0:f269e3021894	715	const mbedtls_ssl_ciphersuite_t *ciphersuite_info;
elessair	0:f269e3021894	716
elessair	0:f269e3021894	717	MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write client hello" ) );
elessair	0:f269e3021894	718
elessair	0:f269e3021894	719	if( ssl->conf->f_rng == NULL )
elessair	0:f269e3021894	720	{
elessair	0:f269e3021894	721	MBEDTLS_SSL_DEBUG_MSG( 1, ( "no RNG provided") );
elessair	0:f269e3021894	722	return( MBEDTLS_ERR_SSL_NO_RNG );
elessair	0:f269e3021894	723	}
elessair	0:f269e3021894	724
elessair	0:f269e3021894	725	#if defined(MBEDTLS_SSL_RENEGOTIATION)
elessair	0:f269e3021894	726	if( ssl->renego_status == MBEDTLS_SSL_INITIAL_HANDSHAKE )
elessair	0:f269e3021894	727	#endif
elessair	0:f269e3021894	728	{
elessair	0:f269e3021894	729	ssl->major_ver = ssl->conf->min_major_ver;
elessair	0:f269e3021894	730	ssl->minor_ver = ssl->conf->min_minor_ver;
elessair	0:f269e3021894	731	}
elessair	0:f269e3021894	732
elessair	0:f269e3021894	733	if( ssl->conf->max_major_ver == 0 )
elessair	0:f269e3021894	734	{
elessair	0:f269e3021894	735	MBEDTLS_SSL_DEBUG_MSG( 1, ( "configured max major version is invalid, "
elessair	0:f269e3021894	736	"consider using mbedtls_ssl_config_defaults()" ) );
elessair	0:f269e3021894	737	return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
elessair	0:f269e3021894	738	}
elessair	0:f269e3021894	739
elessair	0:f269e3021894	740	/*
elessair	0:f269e3021894	741	* 0 . 0 handshake type
elessair	0:f269e3021894	742	* 1 . 3 handshake length
elessair	0:f269e3021894	743	* 4 . 5 highest version supported
elessair	0:f269e3021894	744	* 6 . 9 current UNIX time
elessair	0:f269e3021894	745	* 10 . 37 random bytes
elessair	0:f269e3021894	746	*/
elessair	0:f269e3021894	747	buf = ssl->out_msg;
elessair	0:f269e3021894	748	p = buf + 4;
elessair	0:f269e3021894	749
elessair	0:f269e3021894	750	mbedtls_ssl_write_version( ssl->conf->max_major_ver, ssl->conf->max_minor_ver,
elessair	0:f269e3021894	751	ssl->conf->transport, p );
elessair	0:f269e3021894	752	p += 2;
elessair	0:f269e3021894	753
elessair	0:f269e3021894	754	MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, max version: [%d:%d]",
elessair	0:f269e3021894	755	buf[4], buf[5] ) );
elessair	0:f269e3021894	756
elessair	0:f269e3021894	757	if( ( ret = ssl_generate_random( ssl ) ) != 0 )
elessair	0:f269e3021894	758	{
elessair	0:f269e3021894	759	MBEDTLS_SSL_DEBUG_RET( 1, "ssl_generate_random", ret );
elessair	0:f269e3021894	760	return( ret );
elessair	0:f269e3021894	761	}
elessair	0:f269e3021894	762
elessair	0:f269e3021894	763	memcpy( p, ssl->handshake->randbytes, 32 );
elessair	0:f269e3021894	764	MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, random bytes", p, 32 );
elessair	0:f269e3021894	765	p += 32;
elessair	0:f269e3021894	766
elessair	0:f269e3021894	767	/*
elessair	0:f269e3021894	768	* 38 . 38 session id length
elessair	0:f269e3021894	769	* 39 . 39+n session id
elessair	0:f269e3021894	770	* 39+n . 39+n DTLS only: cookie length (1 byte)
elessair	0:f269e3021894	771	* 40+n . .. DTSL only: cookie
elessair	0:f269e3021894	772	* .. . .. ciphersuitelist length (2 bytes)
elessair	0:f269e3021894	773	* .. . .. ciphersuitelist
elessair	0:f269e3021894	774	* .. . .. compression methods length (1 byte)
elessair	0:f269e3021894	775	* .. . .. compression methods
elessair	0:f269e3021894	776	* .. . .. extensions length (2 bytes)
elessair	0:f269e3021894	777	* .. . .. extensions
elessair	0:f269e3021894	778	*/
elessair	0:f269e3021894	779	n = ssl->session_negotiate->id_len;
elessair	0:f269e3021894	780
elessair	0:f269e3021894	781	if( n < 16 \|\| n > 32 \|\|
elessair	0:f269e3021894	782	#if defined(MBEDTLS_SSL_RENEGOTIATION)
elessair	0:f269e3021894	783	ssl->renego_status != MBEDTLS_SSL_INITIAL_HANDSHAKE \|\|
elessair	0:f269e3021894	784	#endif
elessair	0:f269e3021894	785	ssl->handshake->resume == 0 )
elessair	0:f269e3021894	786	{
elessair	0:f269e3021894	787	n = 0;
elessair	0:f269e3021894	788	}
elessair	0:f269e3021894	789
elessair	0:f269e3021894	790	#if defined(MBEDTLS_SSL_SESSION_TICKETS)
elessair	0:f269e3021894	791	/*
elessair	0:f269e3021894	792	* RFC 5077 section 3.4: "When presenting a ticket, the client MAY
elessair	0:f269e3021894	793	* generate and include a Session ID in the TLS ClientHello."
elessair	0:f269e3021894	794	*/
elessair	0:f269e3021894	795	#if defined(MBEDTLS_SSL_RENEGOTIATION)
elessair	0:f269e3021894	796	if( ssl->renego_status == MBEDTLS_SSL_INITIAL_HANDSHAKE )
elessair	0:f269e3021894	797	#endif
elessair	0:f269e3021894	798	{
elessair	0:f269e3021894	799	if( ssl->session_negotiate->ticket != NULL &&
elessair	0:f269e3021894	800	ssl->session_negotiate->ticket_len != 0 )
elessair	0:f269e3021894	801	{
elessair	0:f269e3021894	802	ret = ssl->conf->f_rng( ssl->conf->p_rng, ssl->session_negotiate->id, 32 );
elessair	0:f269e3021894	803
elessair	0:f269e3021894	804	if( ret != 0 )
elessair	0:f269e3021894	805	return( ret );
elessair	0:f269e3021894	806
elessair	0:f269e3021894	807	ssl->session_negotiate->id_len = n = 32;
elessair	0:f269e3021894	808	}
elessair	0:f269e3021894	809	}
elessair	0:f269e3021894	810	#endif /* MBEDTLS_SSL_SESSION_TICKETS */
elessair	0:f269e3021894	811
elessair	0:f269e3021894	812	*p++ = (unsigned char) n;
elessair	0:f269e3021894	813
elessair	0:f269e3021894	814	for( i = 0; i < n; i++ )
elessair	0:f269e3021894	815	*p++ = ssl->session_negotiate->id[i];
elessair	0:f269e3021894	816
elessair	0:f269e3021894	817	MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, session id len.: %d", n ) );
elessair	0:f269e3021894	818	MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, session id", buf + 39, n );
elessair	0:f269e3021894	819
elessair	0:f269e3021894	820	/*
elessair	0:f269e3021894	821	* DTLS cookie
elessair	0:f269e3021894	822	*/
elessair	0:f269e3021894	823	#if defined(MBEDTLS_SSL_PROTO_DTLS)
elessair	0:f269e3021894	824	if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
elessair	0:f269e3021894	825	{
elessair	0:f269e3021894	826	if( ssl->handshake->verify_cookie == NULL )
elessair	0:f269e3021894	827	{
elessair	0:f269e3021894	828	MBEDTLS_SSL_DEBUG_MSG( 3, ( "no verify cookie to send" ) );
elessair	0:f269e3021894	829	*p++ = 0;
elessair	0:f269e3021894	830	}
elessair	0:f269e3021894	831	else
elessair	0:f269e3021894	832	{
elessair	0:f269e3021894	833	MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, cookie",
elessair	0:f269e3021894	834	ssl->handshake->verify_cookie,
elessair	0:f269e3021894	835	ssl->handshake->verify_cookie_len );
elessair	0:f269e3021894	836
elessair	0:f269e3021894	837	*p++ = ssl->handshake->verify_cookie_len;
elessair	0:f269e3021894	838	memcpy( p, ssl->handshake->verify_cookie,
elessair	0:f269e3021894	839	ssl->handshake->verify_cookie_len );
elessair	0:f269e3021894	840	p += ssl->handshake->verify_cookie_len;
elessair	0:f269e3021894	841	}
elessair	0:f269e3021894	842	}
elessair	0:f269e3021894	843	#endif
elessair	0:f269e3021894	844
elessair	0:f269e3021894	845	/*
elessair	0:f269e3021894	846	* Ciphersuite list
elessair	0:f269e3021894	847	*/
elessair	0:f269e3021894	848	ciphersuites = ssl->conf->ciphersuite_list[ssl->minor_ver];
elessair	0:f269e3021894	849
elessair	0:f269e3021894	850	/* Skip writing ciphersuite length for now */
elessair	0:f269e3021894	851	n = 0;
elessair	0:f269e3021894	852	q = p;
elessair	0:f269e3021894	853	p += 2;
elessair	0:f269e3021894	854
elessair	0:f269e3021894	855	for( i = 0; ciphersuites[i] != 0; i++ )
elessair	0:f269e3021894	856	{
elessair	0:f269e3021894	857	ciphersuite_info = mbedtls_ssl_ciphersuite_from_id( ciphersuites[i] );
elessair	0:f269e3021894	858
elessair	0:f269e3021894	859	if( ciphersuite_info == NULL )
elessair	0:f269e3021894	860	continue;
elessair	0:f269e3021894	861
elessair	0:f269e3021894	862	if( ciphersuite_info->min_minor_ver > ssl->conf->max_minor_ver \|\|
elessair	0:f269e3021894	863	ciphersuite_info->max_minor_ver < ssl->conf->min_minor_ver )
elessair	0:f269e3021894	864	continue;
elessair	0:f269e3021894	865
elessair	0:f269e3021894	866	#if defined(MBEDTLS_SSL_PROTO_DTLS)
elessair	0:f269e3021894	867	if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
elessair	0:f269e3021894	868	( ciphersuite_info->flags & MBEDTLS_CIPHERSUITE_NODTLS ) )
elessair	0:f269e3021894	869	continue;
elessair	0:f269e3021894	870	#endif
elessair	0:f269e3021894	871
elessair	0:f269e3021894	872	#if defined(MBEDTLS_ARC4_C)
elessair	0:f269e3021894	873	if( ssl->conf->arc4_disabled == MBEDTLS_SSL_ARC4_DISABLED &&
elessair	0:f269e3021894	874	ciphersuite_info->cipher == MBEDTLS_CIPHER_ARC4_128 )
elessair	0:f269e3021894	875	continue;
elessair	0:f269e3021894	876	#endif
elessair	0:f269e3021894	877
elessair	0:f269e3021894	878	#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
elessair	0:f269e3021894	879	if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECJPAKE &&
elessair	0:f269e3021894	880	mbedtls_ecjpake_check( &ssl->handshake->ecjpake_ctx ) != 0 )
elessair	0:f269e3021894	881	continue;
elessair	0:f269e3021894	882	#endif
elessair	0:f269e3021894	883
elessair	0:f269e3021894	884	MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, add ciphersuite: %04x",
elessair	0:f269e3021894	885	ciphersuites[i] ) );
elessair	0:f269e3021894	886
elessair	0:f269e3021894	887	n++;
elessair	0:f269e3021894	888	*p++ = (unsigned char)( ciphersuites[i] >> 8 );
elessair	0:f269e3021894	889	*p++ = (unsigned char)( ciphersuites[i] );
elessair	0:f269e3021894	890	}
elessair	0:f269e3021894	891
elessair	0:f269e3021894	892	/*
elessair	0:f269e3021894	893	* Add TLS_EMPTY_RENEGOTIATION_INFO_SCSV
elessair	0:f269e3021894	894	*/
elessair	0:f269e3021894	895	#if defined(MBEDTLS_SSL_RENEGOTIATION)
elessair	0:f269e3021894	896	if( ssl->renego_status == MBEDTLS_SSL_INITIAL_HANDSHAKE )
elessair	0:f269e3021894	897	#endif
elessair	0:f269e3021894	898	{
elessair	0:f269e3021894	899	*p++ = (unsigned char)( MBEDTLS_SSL_EMPTY_RENEGOTIATION_INFO >> 8 );
elessair	0:f269e3021894	900	*p++ = (unsigned char)( MBEDTLS_SSL_EMPTY_RENEGOTIATION_INFO );
elessair	0:f269e3021894	901	n++;
elessair	0:f269e3021894	902	}
elessair	0:f269e3021894	903
elessair	0:f269e3021894	904	/* Some versions of OpenSSL don't handle it correctly if not at end */
elessair	0:f269e3021894	905	#if defined(MBEDTLS_SSL_FALLBACK_SCSV)
elessair	0:f269e3021894	906	if( ssl->conf->fallback == MBEDTLS_SSL_IS_FALLBACK )
elessair	0:f269e3021894	907	{
elessair	0:f269e3021894	908	MBEDTLS_SSL_DEBUG_MSG( 3, ( "adding FALLBACK_SCSV" ) );
elessair	0:f269e3021894	909	*p++ = (unsigned char)( MBEDTLS_SSL_FALLBACK_SCSV_VALUE >> 8 );
elessair	0:f269e3021894	910	*p++ = (unsigned char)( MBEDTLS_SSL_FALLBACK_SCSV_VALUE );
elessair	0:f269e3021894	911	n++;
elessair	0:f269e3021894	912	}
elessair	0:f269e3021894	913	#endif
elessair	0:f269e3021894	914
elessair	0:f269e3021894	915	*q++ = (unsigned char)( n >> 7 );
elessair	0:f269e3021894	916	*q++ = (unsigned char)( n << 1 );
elessair	0:f269e3021894	917
elessair	0:f269e3021894	918	MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, got %d ciphersuites", n ) );
elessair	0:f269e3021894	919
elessair	0:f269e3021894	920	#if defined(MBEDTLS_ZLIB_SUPPORT)
elessair	0:f269e3021894	921	offer_compress = 1;
elessair	0:f269e3021894	922	#else
elessair	0:f269e3021894	923	offer_compress = 0;
elessair	0:f269e3021894	924	#endif
elessair	0:f269e3021894	925
elessair	0:f269e3021894	926	/*
elessair	0:f269e3021894	927	* We don't support compression with DTLS right now: is many records come
elessair	0:f269e3021894	928	* in the same datagram, uncompressing one could overwrite the next one.
elessair	0:f269e3021894	929	* We don't want to add complexity for handling that case unless there is
elessair	0:f269e3021894	930	* an actual need for it.
elessair	0:f269e3021894	931	*/
elessair	0:f269e3021894	932	#if defined(MBEDTLS_SSL_PROTO_DTLS)
elessair	0:f269e3021894	933	if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
elessair	0:f269e3021894	934	offer_compress = 0;
elessair	0:f269e3021894	935	#endif
elessair	0:f269e3021894	936
elessair	0:f269e3021894	937	if( offer_compress )
elessair	0:f269e3021894	938	{
elessair	0:f269e3021894	939	MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, compress len.: %d", 2 ) );
elessair	0:f269e3021894	940	MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, compress alg.: %d %d",
elessair	0:f269e3021894	941	MBEDTLS_SSL_COMPRESS_DEFLATE, MBEDTLS_SSL_COMPRESS_NULL ) );
elessair	0:f269e3021894	942
elessair	0:f269e3021894	943	*p++ = 2;
elessair	0:f269e3021894	944	*p++ = MBEDTLS_SSL_COMPRESS_DEFLATE;
elessair	0:f269e3021894	945	*p++ = MBEDTLS_SSL_COMPRESS_NULL;
elessair	0:f269e3021894	946	}
elessair	0:f269e3021894	947	else
elessair	0:f269e3021894	948	{
elessair	0:f269e3021894	949	MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, compress len.: %d", 1 ) );
elessair	0:f269e3021894	950	MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, compress alg.: %d",
elessair	0:f269e3021894	951	MBEDTLS_SSL_COMPRESS_NULL ) );
elessair	0:f269e3021894	952
elessair	0:f269e3021894	953	*p++ = 1;
elessair	0:f269e3021894	954	*p++ = MBEDTLS_SSL_COMPRESS_NULL;
elessair	0:f269e3021894	955	}
elessair	0:f269e3021894	956
elessair	0:f269e3021894	957	// First write extensions, then the total length
elessair	0:f269e3021894	958	//
elessair	0:f269e3021894	959	#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
elessair	0:f269e3021894	960	ssl_write_hostname_ext( ssl, p + 2 + ext_len, &olen );
elessair	0:f269e3021894	961	ext_len += olen;
elessair	0:f269e3021894	962	#endif
elessair	0:f269e3021894	963
elessair	0:f269e3021894	964	#if defined(MBEDTLS_SSL_RENEGOTIATION)
elessair	0:f269e3021894	965	ssl_write_renegotiation_ext( ssl, p + 2 + ext_len, &olen );
elessair	0:f269e3021894	966	ext_len += olen;
elessair	0:f269e3021894	967	#endif
elessair	0:f269e3021894	968
elessair	0:f269e3021894	969	#if defined(MBEDTLS_SSL_PROTO_TLS1_2) && \
elessair	0:f269e3021894	970	defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED)
elessair	0:f269e3021894	971	ssl_write_signature_algorithms_ext( ssl, p + 2 + ext_len, &olen );
elessair	0:f269e3021894	972	ext_len += olen;
elessair	0:f269e3021894	973	#endif
elessair	0:f269e3021894	974
elessair	0:f269e3021894	975	#if defined(MBEDTLS_ECDH_C) \|\| defined(MBEDTLS_ECDSA_C) \|\| \
elessair	0:f269e3021894	976	defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
elessair	0:f269e3021894	977	ssl_write_supported_elliptic_curves_ext( ssl, p + 2 + ext_len, &olen );
elessair	0:f269e3021894	978	ext_len += olen;
elessair	0:f269e3021894	979
elessair	0:f269e3021894	980	ssl_write_supported_point_formats_ext( ssl, p + 2 + ext_len, &olen );
elessair	0:f269e3021894	981	ext_len += olen;
elessair	0:f269e3021894	982	#endif
elessair	0:f269e3021894	983
elessair	0:f269e3021894	984	#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
elessair	0:f269e3021894	985	ssl_write_ecjpake_kkpp_ext( ssl, p + 2 + ext_len, &olen );
elessair	0:f269e3021894	986	ext_len += olen;
elessair	0:f269e3021894	987	#endif
elessair	0:f269e3021894	988
elessair	0:f269e3021894	989	#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
elessair	0:f269e3021894	990	ssl_write_max_fragment_length_ext( ssl, p + 2 + ext_len, &olen );
elessair	0:f269e3021894	991	ext_len += olen;
elessair	0:f269e3021894	992	#endif
elessair	0:f269e3021894	993
elessair	0:f269e3021894	994	#if defined(MBEDTLS_SSL_TRUNCATED_HMAC)
elessair	0:f269e3021894	995	ssl_write_truncated_hmac_ext( ssl, p + 2 + ext_len, &olen );
elessair	0:f269e3021894	996	ext_len += olen;
elessair	0:f269e3021894	997	#endif
elessair	0:f269e3021894	998
elessair	0:f269e3021894	999	#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
elessair	0:f269e3021894	1000	ssl_write_encrypt_then_mac_ext( ssl, p + 2 + ext_len, &olen );
elessair	0:f269e3021894	1001	ext_len += olen;
elessair	0:f269e3021894	1002	#endif
elessair	0:f269e3021894	1003
elessair	0:f269e3021894	1004	#if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET)
elessair	0:f269e3021894	1005	ssl_write_extended_ms_ext( ssl, p + 2 + ext_len, &olen );
elessair	0:f269e3021894	1006	ext_len += olen;
elessair	0:f269e3021894	1007	#endif
elessair	0:f269e3021894	1008
elessair	0:f269e3021894	1009	#if defined(MBEDTLS_SSL_ALPN)
elessair	0:f269e3021894	1010	ssl_write_alpn_ext( ssl, p + 2 + ext_len, &olen );
elessair	0:f269e3021894	1011	ext_len += olen;
elessair	0:f269e3021894	1012	#endif
elessair	0:f269e3021894	1013
elessair	0:f269e3021894	1014	#if defined(MBEDTLS_SSL_SESSION_TICKETS)
elessair	0:f269e3021894	1015	ssl_write_session_ticket_ext( ssl, p + 2 + ext_len, &olen );
elessair	0:f269e3021894	1016	ext_len += olen;
elessair	0:f269e3021894	1017	#endif
elessair	0:f269e3021894	1018
elessair	0:f269e3021894	1019	/* olen unused if all extensions are disabled */
elessair	0:f269e3021894	1020	((void) olen);
elessair	0:f269e3021894	1021
elessair	0:f269e3021894	1022	MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, total extension length: %d",
elessair	0:f269e3021894	1023	ext_len ) );
elessair	0:f269e3021894	1024
elessair	0:f269e3021894	1025	if( ext_len > 0 )
elessair	0:f269e3021894	1026	{
elessair	0:f269e3021894	1027	*p++ = (unsigned char)( ( ext_len >> 8 ) & 0xFF );
elessair	0:f269e3021894	1028	*p++ = (unsigned char)( ( ext_len ) & 0xFF );
elessair	0:f269e3021894	1029	p += ext_len;
elessair	0:f269e3021894	1030	}
elessair	0:f269e3021894	1031
elessair	0:f269e3021894	1032	ssl->out_msglen = p - buf;
elessair	0:f269e3021894	1033	ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE;
elessair	0:f269e3021894	1034	ssl->out_msg[0] = MBEDTLS_SSL_HS_CLIENT_HELLO;
elessair	0:f269e3021894	1035
elessair	0:f269e3021894	1036	ssl->state++;
elessair	0:f269e3021894	1037
elessair	0:f269e3021894	1038	#if defined(MBEDTLS_SSL_PROTO_DTLS)
elessair	0:f269e3021894	1039	if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
elessair	0:f269e3021894	1040	mbedtls_ssl_send_flight_completed( ssl );
elessair	0:f269e3021894	1041	#endif
elessair	0:f269e3021894	1042
elessair	0:f269e3021894	1043	if( ( ret = mbedtls_ssl_write_record( ssl ) ) != 0 )
elessair	0:f269e3021894	1044	{
elessair	0:f269e3021894	1045	MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_record", ret );
elessair	0:f269e3021894	1046	return( ret );
elessair	0:f269e3021894	1047	}
elessair	0:f269e3021894	1048
elessair	0:f269e3021894	1049	MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write client hello" ) );
elessair	0:f269e3021894	1050
elessair	0:f269e3021894	1051	return( 0 );
elessair	0:f269e3021894	1052	}
elessair	0:f269e3021894	1053
elessair	0:f269e3021894	1054	static int ssl_parse_renegotiation_info( mbedtls_ssl_context *ssl,
elessair	0:f269e3021894	1055	const unsigned char *buf,
elessair	0:f269e3021894	1056	size_t len )
elessair	0:f269e3021894	1057	{
elessair	0:f269e3021894	1058	int ret;
elessair	0:f269e3021894	1059
elessair	0:f269e3021894	1060	#if defined(MBEDTLS_SSL_RENEGOTIATION)
elessair	0:f269e3021894	1061	if( ssl->renego_status != MBEDTLS_SSL_INITIAL_HANDSHAKE )
elessair	0:f269e3021894	1062	{
elessair	0:f269e3021894	1063	/* Check verify-data in constant-time. The length OTOH is no secret */
elessair	0:f269e3021894	1064	if( len != 1 + ssl->verify_data_len * 2 \|\|
elessair	0:f269e3021894	1065	buf[0] != ssl->verify_data_len * 2 \|\|
elessair	0:f269e3021894	1066	mbedtls_ssl_safer_memcmp( buf + 1,
elessair	0:f269e3021894	1067	ssl->own_verify_data, ssl->verify_data_len ) != 0 \|\|
elessair	0:f269e3021894	1068	mbedtls_ssl_safer_memcmp( buf + 1 + ssl->verify_data_len,
elessair	0:f269e3021894	1069	ssl->peer_verify_data, ssl->verify_data_len ) != 0 )
elessair	0:f269e3021894	1070	{
elessair	0:f269e3021894	1071	MBEDTLS_SSL_DEBUG_MSG( 1, ( "non-matching renegotiation info" ) );
elessair	0:f269e3021894	1072
elessair	0:f269e3021894	1073	if( ( ret = mbedtls_ssl_send_fatal_handshake_failure( ssl ) ) != 0 )
elessair	0:f269e3021894	1074	return( ret );
elessair	0:f269e3021894	1075
elessair	0:f269e3021894	1076	return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
elessair	0:f269e3021894	1077	}
elessair	0:f269e3021894	1078	}
elessair	0:f269e3021894	1079	else
elessair	0:f269e3021894	1080	#endif /* MBEDTLS_SSL_RENEGOTIATION */
elessair	0:f269e3021894	1081	{
elessair	0:f269e3021894	1082	if( len != 1 \|\| buf[0] != 0x00 )
elessair	0:f269e3021894	1083	{
elessair	0:f269e3021894	1084	MBEDTLS_SSL_DEBUG_MSG( 1, ( "non-zero length renegotiation info" ) );
elessair	0:f269e3021894	1085
elessair	0:f269e3021894	1086	if( ( ret = mbedtls_ssl_send_fatal_handshake_failure( ssl ) ) != 0 )
elessair	0:f269e3021894	1087	return( ret );
elessair	0:f269e3021894	1088
elessair	0:f269e3021894	1089	return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
elessair	0:f269e3021894	1090	}
elessair	0:f269e3021894	1091
elessair	0:f269e3021894	1092	ssl->secure_renegotiation = MBEDTLS_SSL_SECURE_RENEGOTIATION;
elessair	0:f269e3021894	1093	}
elessair	0:f269e3021894	1094
elessair	0:f269e3021894	1095	return( 0 );
elessair	0:f269e3021894	1096	}
elessair	0:f269e3021894	1097
elessair	0:f269e3021894	1098	#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
elessair	0:f269e3021894	1099	static int ssl_parse_max_fragment_length_ext( mbedtls_ssl_context *ssl,
elessair	0:f269e3021894	1100	const unsigned char *buf,
elessair	0:f269e3021894	1101	size_t len )
elessair	0:f269e3021894	1102	{
elessair	0:f269e3021894	1103	/*
elessair	0:f269e3021894	1104	* server should use the extension only if we did,
elessair	0:f269e3021894	1105	* and if so the server's value should match ours (and len is always 1)
elessair	0:f269e3021894	1106	*/
elessair	0:f269e3021894	1107	if( ssl->conf->mfl_code == MBEDTLS_SSL_MAX_FRAG_LEN_NONE \|\|
elessair	0:f269e3021894	1108	len != 1 \|\|
elessair	0:f269e3021894	1109	buf[0] != ssl->conf->mfl_code )
elessair	0:f269e3021894	1110	{
elessair	0:f269e3021894	1111	return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
elessair	0:f269e3021894	1112	}
elessair	0:f269e3021894	1113
elessair	0:f269e3021894	1114	return( 0 );
elessair	0:f269e3021894	1115	}
elessair	0:f269e3021894	1116	#endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */
elessair	0:f269e3021894	1117
elessair	0:f269e3021894	1118	#if defined(MBEDTLS_SSL_TRUNCATED_HMAC)
elessair	0:f269e3021894	1119	static int ssl_parse_truncated_hmac_ext( mbedtls_ssl_context *ssl,
elessair	0:f269e3021894	1120	const unsigned char *buf,
elessair	0:f269e3021894	1121	size_t len )
elessair	0:f269e3021894	1122	{
elessair	0:f269e3021894	1123	if( ssl->conf->trunc_hmac == MBEDTLS_SSL_TRUNC_HMAC_DISABLED \|\|
elessair	0:f269e3021894	1124	len != 0 )
elessair	0:f269e3021894	1125	{
elessair	0:f269e3021894	1126	return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
elessair	0:f269e3021894	1127	}
elessair	0:f269e3021894	1128
elessair	0:f269e3021894	1129	((void) buf);
elessair	0:f269e3021894	1130
elessair	0:f269e3021894	1131	ssl->session_negotiate->trunc_hmac = MBEDTLS_SSL_TRUNC_HMAC_ENABLED;
elessair	0:f269e3021894	1132
elessair	0:f269e3021894	1133	return( 0 );
elessair	0:f269e3021894	1134	}
elessair	0:f269e3021894	1135	#endif /* MBEDTLS_SSL_TRUNCATED_HMAC */
elessair	0:f269e3021894	1136
elessair	0:f269e3021894	1137	#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
elessair	0:f269e3021894	1138	static int ssl_parse_encrypt_then_mac_ext( mbedtls_ssl_context *ssl,
elessair	0:f269e3021894	1139	const unsigned char *buf,
elessair	0:f269e3021894	1140	size_t len )
elessair	0:f269e3021894	1141	{
elessair	0:f269e3021894	1142	if( ssl->conf->encrypt_then_mac == MBEDTLS_SSL_ETM_DISABLED \|\|
elessair	0:f269e3021894	1143	ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 \|\|
elessair	0:f269e3021894	1144	len != 0 )
elessair	0:f269e3021894	1145	{
elessair	0:f269e3021894	1146	return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
elessair	0:f269e3021894	1147	}
elessair	0:f269e3021894	1148
elessair	0:f269e3021894	1149	((void) buf);
elessair	0:f269e3021894	1150
elessair	0:f269e3021894	1151	ssl->session_negotiate->encrypt_then_mac = MBEDTLS_SSL_ETM_ENABLED;
elessair	0:f269e3021894	1152
elessair	0:f269e3021894	1153	return( 0 );
elessair	0:f269e3021894	1154	}
elessair	0:f269e3021894	1155	#endif /* MBEDTLS_SSL_ENCRYPT_THEN_MAC */
elessair	0:f269e3021894	1156
elessair	0:f269e3021894	1157	#if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET)
elessair	0:f269e3021894	1158	static int ssl_parse_extended_ms_ext( mbedtls_ssl_context *ssl,
elessair	0:f269e3021894	1159	const unsigned char *buf,
elessair	0:f269e3021894	1160	size_t len )
elessair	0:f269e3021894	1161	{
elessair	0:f269e3021894	1162	if( ssl->conf->extended_ms == MBEDTLS_SSL_EXTENDED_MS_DISABLED \|\|
elessair	0:f269e3021894	1163	ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 \|\|
elessair	0:f269e3021894	1164	len != 0 )
elessair	0:f269e3021894	1165	{
elessair	0:f269e3021894	1166	return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
elessair	0:f269e3021894	1167	}
elessair	0:f269e3021894	1168
elessair	0:f269e3021894	1169	((void) buf);
elessair	0:f269e3021894	1170
elessair	0:f269e3021894	1171	ssl->handshake->extended_ms = MBEDTLS_SSL_EXTENDED_MS_ENABLED;
elessair	0:f269e3021894	1172
elessair	0:f269e3021894	1173	return( 0 );
elessair	0:f269e3021894	1174	}
elessair	0:f269e3021894	1175	#endif /* MBEDTLS_SSL_EXTENDED_MASTER_SECRET */
elessair	0:f269e3021894	1176
elessair	0:f269e3021894	1177	#if defined(MBEDTLS_SSL_SESSION_TICKETS)
elessair	0:f269e3021894	1178	static int ssl_parse_session_ticket_ext( mbedtls_ssl_context *ssl,
elessair	0:f269e3021894	1179	const unsigned char *buf,
elessair	0:f269e3021894	1180	size_t len )
elessair	0:f269e3021894	1181	{
elessair	0:f269e3021894	1182	if( ssl->conf->session_tickets == MBEDTLS_SSL_SESSION_TICKETS_DISABLED \|\|
elessair	0:f269e3021894	1183	len != 0 )
elessair	0:f269e3021894	1184	{
elessair	0:f269e3021894	1185	return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
elessair	0:f269e3021894	1186	}
elessair	0:f269e3021894	1187
elessair	0:f269e3021894	1188	((void) buf);
elessair	0:f269e3021894	1189
elessair	0:f269e3021894	1190	ssl->handshake->new_session_ticket = 1;
elessair	0:f269e3021894	1191
elessair	0:f269e3021894	1192	return( 0 );
elessair	0:f269e3021894	1193	}
elessair	0:f269e3021894	1194	#endif /* MBEDTLS_SSL_SESSION_TICKETS */
elessair	0:f269e3021894	1195
elessair	0:f269e3021894	1196	#if defined(MBEDTLS_ECDH_C) \|\| defined(MBEDTLS_ECDSA_C) \|\| \
elessair	0:f269e3021894	1197	defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
elessair	0:f269e3021894	1198	static int ssl_parse_supported_point_formats_ext( mbedtls_ssl_context *ssl,
elessair	0:f269e3021894	1199	const unsigned char *buf,
elessair	0:f269e3021894	1200	size_t len )
elessair	0:f269e3021894	1201	{
elessair	0:f269e3021894	1202	size_t list_size;
elessair	0:f269e3021894	1203	const unsigned char *p;
elessair	0:f269e3021894	1204
elessair	0:f269e3021894	1205	list_size = buf[0];
elessair	0:f269e3021894	1206	if( list_size + 1 != len )
elessair	0:f269e3021894	1207	{
elessair	0:f269e3021894	1208	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server hello message" ) );
elessair	0:f269e3021894	1209	return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
elessair	0:f269e3021894	1210	}
elessair	0:f269e3021894	1211
elessair	0:f269e3021894	1212	p = buf + 1;
elessair	0:f269e3021894	1213	while( list_size > 0 )
elessair	0:f269e3021894	1214	{
elessair	0:f269e3021894	1215	if( p[0] == MBEDTLS_ECP_PF_UNCOMPRESSED \|\|
elessair	0:f269e3021894	1216	p[0] == MBEDTLS_ECP_PF_COMPRESSED )
elessair	0:f269e3021894	1217	{
elessair	0:f269e3021894	1218	#if defined(MBEDTLS_ECDH_C) \|\| defined(MBEDTLS_ECDSA_C)
elessair	0:f269e3021894	1219	ssl->handshake->ecdh_ctx.point_format = p[0];
elessair	0:f269e3021894	1220	#endif
elessair	0:f269e3021894	1221	#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
elessair	0:f269e3021894	1222	ssl->handshake->ecjpake_ctx.point_format = p[0];
elessair	0:f269e3021894	1223	#endif
elessair	0:f269e3021894	1224	MBEDTLS_SSL_DEBUG_MSG( 4, ( "point format selected: %d", p[0] ) );
elessair	0:f269e3021894	1225	return( 0 );
elessair	0:f269e3021894	1226	}
elessair	0:f269e3021894	1227
elessair	0:f269e3021894	1228	list_size--;
elessair	0:f269e3021894	1229	p++;
elessair	0:f269e3021894	1230	}
elessair	0:f269e3021894	1231
elessair	0:f269e3021894	1232	MBEDTLS_SSL_DEBUG_MSG( 1, ( "no point format in common" ) );
elessair	0:f269e3021894	1233	return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
elessair	0:f269e3021894	1234	}
elessair	0:f269e3021894	1235	#endif /* MBEDTLS_ECDH_C \|\| MBEDTLS_ECDSA_C \|\|
elessair	0:f269e3021894	1236	MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */
elessair	0:f269e3021894	1237
elessair	0:f269e3021894	1238	#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
elessair	0:f269e3021894	1239	static int ssl_parse_ecjpake_kkpp( mbedtls_ssl_context *ssl,
elessair	0:f269e3021894	1240	const unsigned char *buf,
elessair	0:f269e3021894	1241	size_t len )
elessair	0:f269e3021894	1242	{
elessair	0:f269e3021894	1243	int ret;
elessair	0:f269e3021894	1244
elessair	0:f269e3021894	1245	if( ssl->transform_negotiate->ciphersuite_info->key_exchange !=
elessair	0:f269e3021894	1246	MBEDTLS_KEY_EXCHANGE_ECJPAKE )
elessair	0:f269e3021894	1247	{
elessair	0:f269e3021894	1248	MBEDTLS_SSL_DEBUG_MSG( 3, ( "skip ecjpake kkpp extension" ) );
elessair	0:f269e3021894	1249	return( 0 );
elessair	0:f269e3021894	1250	}
elessair	0:f269e3021894	1251
elessair	0:f269e3021894	1252	/* If we got here, we no longer need our cached extension */
elessair	0:f269e3021894	1253	mbedtls_free( ssl->handshake->ecjpake_cache );
elessair	0:f269e3021894	1254	ssl->handshake->ecjpake_cache = NULL;
elessair	0:f269e3021894	1255	ssl->handshake->ecjpake_cache_len = 0;
elessair	0:f269e3021894	1256
elessair	0:f269e3021894	1257	if( ( ret = mbedtls_ecjpake_read_round_one( &ssl->handshake->ecjpake_ctx,
elessair	0:f269e3021894	1258	buf, len ) ) != 0 )
elessair	0:f269e3021894	1259	{
elessair	0:f269e3021894	1260	MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecjpake_read_round_one", ret );
elessair	0:f269e3021894	1261	return( ret );
elessair	0:f269e3021894	1262	}
elessair	0:f269e3021894	1263
elessair	0:f269e3021894	1264	return( 0 );
elessair	0:f269e3021894	1265	}
elessair	0:f269e3021894	1266	#endif /* MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */
elessair	0:f269e3021894	1267
elessair	0:f269e3021894	1268	#if defined(MBEDTLS_SSL_ALPN)
elessair	0:f269e3021894	1269	static int ssl_parse_alpn_ext( mbedtls_ssl_context *ssl,
elessair	0:f269e3021894	1270	const unsigned char *buf, size_t len )
elessair	0:f269e3021894	1271	{
elessair	0:f269e3021894	1272	size_t list_len, name_len;
elessair	0:f269e3021894	1273	const char **p;
elessair	0:f269e3021894	1274
elessair	0:f269e3021894	1275	/* If we didn't send it, the server shouldn't send it */
elessair	0:f269e3021894	1276	if( ssl->conf->alpn_list == NULL )
elessair	0:f269e3021894	1277	return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
elessair	0:f269e3021894	1278
elessair	0:f269e3021894	1279	/*
elessair	0:f269e3021894	1280	* opaque ProtocolName<1..2^8-1>;
elessair	0:f269e3021894	1281	*
elessair	0:f269e3021894	1282	* struct {
elessair	0:f269e3021894	1283	* ProtocolName protocol_name_list<2..2^16-1>
elessair	0:f269e3021894	1284	* } ProtocolNameList;
elessair	0:f269e3021894	1285	*
elessair	0:f269e3021894	1286	* the "ProtocolNameList" MUST contain exactly one "ProtocolName"
elessair	0:f269e3021894	1287	*/
elessair	0:f269e3021894	1288
elessair	0:f269e3021894	1289	/* Min length is 2 (list_len) + 1 (name_len) + 1 (name) */
elessair	0:f269e3021894	1290	if( len < 4 )
elessair	0:f269e3021894	1291	return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
elessair	0:f269e3021894	1292
elessair	0:f269e3021894	1293	list_len = ( buf[0] << 8 ) \| buf[1];
elessair	0:f269e3021894	1294	if( list_len != len - 2 )
elessair	0:f269e3021894	1295	return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
elessair	0:f269e3021894	1296
elessair	0:f269e3021894	1297	name_len = buf[2];
elessair	0:f269e3021894	1298	if( name_len != list_len - 1 )
elessair	0:f269e3021894	1299	return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
elessair	0:f269e3021894	1300
elessair	0:f269e3021894	1301	/* Check that the server chosen protocol was in our list and save it */
elessair	0:f269e3021894	1302	for( p = ssl->conf->alpn_list; *p != NULL; p++ )
elessair	0:f269e3021894	1303	{
elessair	0:f269e3021894	1304	if( name_len == strlen( *p ) &&
elessair	0:f269e3021894	1305	memcmp( buf + 3, *p, name_len ) == 0 )
elessair	0:f269e3021894	1306	{
elessair	0:f269e3021894	1307	ssl->alpn_chosen = *p;
elessair	0:f269e3021894	1308	return( 0 );
elessair	0:f269e3021894	1309	}
elessair	0:f269e3021894	1310	}
elessair	0:f269e3021894	1311
elessair	0:f269e3021894	1312	return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
elessair	0:f269e3021894	1313	}
elessair	0:f269e3021894	1314	#endif /* MBEDTLS_SSL_ALPN */
elessair	0:f269e3021894	1315
elessair	0:f269e3021894	1316	/*
elessair	0:f269e3021894	1317	* Parse HelloVerifyRequest. Only called after verifying the HS type.
elessair	0:f269e3021894	1318	*/
elessair	0:f269e3021894	1319	#if defined(MBEDTLS_SSL_PROTO_DTLS)
elessair	0:f269e3021894	1320	static int ssl_parse_hello_verify_request( mbedtls_ssl_context *ssl )
elessair	0:f269e3021894	1321	{
elessair	0:f269e3021894	1322	const unsigned char *p = ssl->in_msg + mbedtls_ssl_hs_hdr_len( ssl );
elessair	0:f269e3021894	1323	int major_ver, minor_ver;
elessair	0:f269e3021894	1324	unsigned char cookie_len;
elessair	0:f269e3021894	1325
elessair	0:f269e3021894	1326	MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse hello verify request" ) );
elessair	0:f269e3021894	1327
elessair	0:f269e3021894	1328	/*
elessair	0:f269e3021894	1329	* struct {
elessair	0:f269e3021894	1330	* ProtocolVersion server_version;
elessair	0:f269e3021894	1331	* opaque cookie<0..2^8-1>;
elessair	0:f269e3021894	1332	* } HelloVerifyRequest;
elessair	0:f269e3021894	1333	*/
elessair	0:f269e3021894	1334	MBEDTLS_SSL_DEBUG_BUF( 3, "server version", p, 2 );
elessair	0:f269e3021894	1335	mbedtls_ssl_read_version( &major_ver, &minor_ver, ssl->conf->transport, p );
elessair	0:f269e3021894	1336	p += 2;
elessair	0:f269e3021894	1337
elessair	0:f269e3021894	1338	/*
elessair	0:f269e3021894	1339	* Since the RFC is not clear on this point, accept DTLS 1.0 (TLS 1.1)
elessair	0:f269e3021894	1340	* even is lower than our min version.
elessair	0:f269e3021894	1341	*/
elessair	0:f269e3021894	1342	if( major_ver < MBEDTLS_SSL_MAJOR_VERSION_3 \|\|
elessair	0:f269e3021894	1343	minor_ver < MBEDTLS_SSL_MINOR_VERSION_2 \|\|
elessair	0:f269e3021894	1344	major_ver > ssl->conf->max_major_ver \|\|
elessair	0:f269e3021894	1345	minor_ver > ssl->conf->max_minor_ver )
elessair	0:f269e3021894	1346	{
elessair	0:f269e3021894	1347	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server version" ) );
elessair	0:f269e3021894	1348
elessair	0:f269e3021894	1349	mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
elessair	0:f269e3021894	1350	MBEDTLS_SSL_ALERT_MSG_PROTOCOL_VERSION );
elessair	0:f269e3021894	1351
elessair	0:f269e3021894	1352	return( MBEDTLS_ERR_SSL_BAD_HS_PROTOCOL_VERSION );
elessair	0:f269e3021894	1353	}
elessair	0:f269e3021894	1354
elessair	0:f269e3021894	1355	cookie_len = *p++;
elessair	0:f269e3021894	1356	MBEDTLS_SSL_DEBUG_BUF( 3, "cookie", p, cookie_len );
elessair	0:f269e3021894	1357
elessair	0:f269e3021894	1358	if( ( ssl->in_msg + ssl->in_msglen ) - p < cookie_len )
elessair	0:f269e3021894	1359	{
elessair	0:f269e3021894	1360	MBEDTLS_SSL_DEBUG_MSG( 1,
elessair	0:f269e3021894	1361	( "cookie length does not match incoming message size" ) );
elessair	0:f269e3021894	1362	mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
elessair	0:f269e3021894	1363	MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
elessair	0:f269e3021894	1364	return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
elessair	0:f269e3021894	1365	}
elessair	0:f269e3021894	1366
elessair	0:f269e3021894	1367	mbedtls_free( ssl->handshake->verify_cookie );
elessair	0:f269e3021894	1368
elessair	0:f269e3021894	1369	ssl->handshake->verify_cookie = mbedtls_calloc( 1, cookie_len );
elessair	0:f269e3021894	1370	if( ssl->handshake->verify_cookie == NULL )
elessair	0:f269e3021894	1371	{
elessair	0:f269e3021894	1372	MBEDTLS_SSL_DEBUG_MSG( 1, ( "alloc failed (%d bytes)", cookie_len ) );
elessair	0:f269e3021894	1373	return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
elessair	0:f269e3021894	1374	}
elessair	0:f269e3021894	1375
elessair	0:f269e3021894	1376	memcpy( ssl->handshake->verify_cookie, p, cookie_len );
elessair	0:f269e3021894	1377	ssl->handshake->verify_cookie_len = cookie_len;
elessair	0:f269e3021894	1378
elessair	0:f269e3021894	1379	/* Start over at ClientHello */
elessair	0:f269e3021894	1380	ssl->state = MBEDTLS_SSL_CLIENT_HELLO;
elessair	0:f269e3021894	1381	mbedtls_ssl_reset_checksum( ssl );
elessair	0:f269e3021894	1382
elessair	0:f269e3021894	1383	mbedtls_ssl_recv_flight_completed( ssl );
elessair	0:f269e3021894	1384
elessair	0:f269e3021894	1385	MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse hello verify request" ) );
elessair	0:f269e3021894	1386
elessair	0:f269e3021894	1387	return( 0 );
elessair	0:f269e3021894	1388	}
elessair	0:f269e3021894	1389	#endif /* MBEDTLS_SSL_PROTO_DTLS */
elessair	0:f269e3021894	1390
elessair	0:f269e3021894	1391	static int ssl_parse_server_hello( mbedtls_ssl_context *ssl )
elessair	0:f269e3021894	1392	{
elessair	0:f269e3021894	1393	int ret, i;
elessair	0:f269e3021894	1394	size_t n;
elessair	0:f269e3021894	1395	size_t ext_len;
elessair	0:f269e3021894	1396	unsigned char buf, ext;
elessair	0:f269e3021894	1397	unsigned char comp;
elessair	0:f269e3021894	1398	#if defined(MBEDTLS_ZLIB_SUPPORT)
elessair	0:f269e3021894	1399	int accept_comp;
elessair	0:f269e3021894	1400	#endif
elessair	0:f269e3021894	1401	#if defined(MBEDTLS_SSL_RENEGOTIATION)
elessair	0:f269e3021894	1402	int renegotiation_info_seen = 0;
elessair	0:f269e3021894	1403	#endif
elessair	0:f269e3021894	1404	int handshake_failure = 0;
elessair	0:f269e3021894	1405	const mbedtls_ssl_ciphersuite_t *suite_info;
elessair	0:f269e3021894	1406	#if defined(MBEDTLS_DEBUG_C)
elessair	0:f269e3021894	1407	uint32_t t;
elessair	0:f269e3021894	1408	#endif
elessair	0:f269e3021894	1409
elessair	0:f269e3021894	1410	MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse server hello" ) );
elessair	0:f269e3021894	1411
elessair	0:f269e3021894	1412	buf = ssl->in_msg;
elessair	0:f269e3021894	1413
elessair	0:f269e3021894	1414	if( ( ret = mbedtls_ssl_read_record( ssl ) ) != 0 )
elessair	0:f269e3021894	1415	{
elessair	0:f269e3021894	1416	MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_read_record", ret );
elessair	0:f269e3021894	1417	return( ret );
elessair	0:f269e3021894	1418	}
elessair	0:f269e3021894	1419
elessair	0:f269e3021894	1420	if( ssl->in_msgtype != MBEDTLS_SSL_MSG_HANDSHAKE )
elessair	0:f269e3021894	1421	{
elessair	0:f269e3021894	1422	#if defined(MBEDTLS_SSL_RENEGOTIATION)
elessair	0:f269e3021894	1423	if( ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS )
elessair	0:f269e3021894	1424	{
elessair	0:f269e3021894	1425	ssl->renego_records_seen++;
elessair	0:f269e3021894	1426
elessair	0:f269e3021894	1427	if( ssl->conf->renego_max_records >= 0 &&
elessair	0:f269e3021894	1428	ssl->renego_records_seen > ssl->conf->renego_max_records )
elessair	0:f269e3021894	1429	{
elessair	0:f269e3021894	1430	MBEDTLS_SSL_DEBUG_MSG( 1, ( "renegotiation requested, "
elessair	0:f269e3021894	1431	"but not honored by server" ) );
elessair	0:f269e3021894	1432	return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE );
elessair	0:f269e3021894	1433	}
elessair	0:f269e3021894	1434
elessair	0:f269e3021894	1435	MBEDTLS_SSL_DEBUG_MSG( 1, ( "non-handshake message during renego" ) );
elessair	0:f269e3021894	1436	return( MBEDTLS_ERR_SSL_WAITING_SERVER_HELLO_RENEGO );
elessair	0:f269e3021894	1437	}
elessair	0:f269e3021894	1438	#endif /* MBEDTLS_SSL_RENEGOTIATION */
elessair	0:f269e3021894	1439
elessair	0:f269e3021894	1440	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server hello message" ) );
elessair	0:f269e3021894	1441	return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE );
elessair	0:f269e3021894	1442	}
elessair	0:f269e3021894	1443
elessair	0:f269e3021894	1444	#if defined(MBEDTLS_SSL_PROTO_DTLS)
elessair	0:f269e3021894	1445	if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
elessair	0:f269e3021894	1446	{
elessair	0:f269e3021894	1447	if( buf[0] == MBEDTLS_SSL_HS_HELLO_VERIFY_REQUEST )
elessair	0:f269e3021894	1448	{
elessair	0:f269e3021894	1449	MBEDTLS_SSL_DEBUG_MSG( 2, ( "received hello verify request" ) );
elessair	0:f269e3021894	1450	MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse server hello" ) );
elessair	0:f269e3021894	1451	return( ssl_parse_hello_verify_request( ssl ) );
elessair	0:f269e3021894	1452	}
elessair	0:f269e3021894	1453	else
elessair	0:f269e3021894	1454	{
elessair	0:f269e3021894	1455	/* We made it through the verification process */
elessair	0:f269e3021894	1456	mbedtls_free( ssl->handshake->verify_cookie );
elessair	0:f269e3021894	1457	ssl->handshake->verify_cookie = NULL;
elessair	0:f269e3021894	1458	ssl->handshake->verify_cookie_len = 0;
elessair	0:f269e3021894	1459	}
elessair	0:f269e3021894	1460	}
elessair	0:f269e3021894	1461	#endif /* MBEDTLS_SSL_PROTO_DTLS */
elessair	0:f269e3021894	1462
elessair	0:f269e3021894	1463	if( ssl->in_hslen < 38 + mbedtls_ssl_hs_hdr_len( ssl ) \|\|
elessair	0:f269e3021894	1464	buf[0] != MBEDTLS_SSL_HS_SERVER_HELLO )
elessair	0:f269e3021894	1465	{
elessair	0:f269e3021894	1466	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server hello message" ) );
elessair	0:f269e3021894	1467	return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
elessair	0:f269e3021894	1468	}
elessair	0:f269e3021894	1469
elessair	0:f269e3021894	1470	/*
elessair	0:f269e3021894	1471	* 0 . 1 server_version
elessair	0:f269e3021894	1472	* 2 . 33 random (maybe including 4 bytes of Unix time)
elessair	0:f269e3021894	1473	* 34 . 34 session_id length = n
elessair	0:f269e3021894	1474	* 35 . 34+n session_id
elessair	0:f269e3021894	1475	* 35+n . 36+n cipher_suite
elessair	0:f269e3021894	1476	* 37+n . 37+n compression_method
elessair	0:f269e3021894	1477	*
elessair	0:f269e3021894	1478	* 38+n . 39+n extensions length (optional)
elessair	0:f269e3021894	1479	* 40+n . .. extensions
elessair	0:f269e3021894	1480	*/
elessair	0:f269e3021894	1481	buf += mbedtls_ssl_hs_hdr_len( ssl );
elessair	0:f269e3021894	1482
elessair	0:f269e3021894	1483	MBEDTLS_SSL_DEBUG_BUF( 3, "server hello, version", buf + 0, 2 );
elessair	0:f269e3021894	1484	mbedtls_ssl_read_version( &ssl->major_ver, &ssl->minor_ver,
elessair	0:f269e3021894	1485	ssl->conf->transport, buf + 0 );
elessair	0:f269e3021894	1486
elessair	0:f269e3021894	1487	if( ssl->major_ver < ssl->conf->min_major_ver \|\|
elessair	0:f269e3021894	1488	ssl->minor_ver < ssl->conf->min_minor_ver \|\|
elessair	0:f269e3021894	1489	ssl->major_ver > ssl->conf->max_major_ver \|\|
elessair	0:f269e3021894	1490	ssl->minor_ver > ssl->conf->max_minor_ver )
elessair	0:f269e3021894	1491	{
elessair	0:f269e3021894	1492	MBEDTLS_SSL_DEBUG_MSG( 1, ( "server version out of bounds - "
elessair	0:f269e3021894	1493	" min: [%d:%d], server: [%d:%d], max: [%d:%d]",
elessair	0:f269e3021894	1494	ssl->conf->min_major_ver, ssl->conf->min_minor_ver,
elessair	0:f269e3021894	1495	ssl->major_ver, ssl->minor_ver,
elessair	0:f269e3021894	1496	ssl->conf->max_major_ver, ssl->conf->max_minor_ver ) );
elessair	0:f269e3021894	1497
elessair	0:f269e3021894	1498	mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
elessair	0:f269e3021894	1499	MBEDTLS_SSL_ALERT_MSG_PROTOCOL_VERSION );
elessair	0:f269e3021894	1500
elessair	0:f269e3021894	1501	return( MBEDTLS_ERR_SSL_BAD_HS_PROTOCOL_VERSION );
elessair	0:f269e3021894	1502	}
elessair	0:f269e3021894	1503
elessair	0:f269e3021894	1504	#if defined(MBEDTLS_DEBUG_C)
elessair	0:f269e3021894	1505	t = ( (uint32_t) buf[2] << 24 )
elessair	0:f269e3021894	1506	\| ( (uint32_t) buf[3] << 16 )
elessair	0:f269e3021894	1507	\| ( (uint32_t) buf[4] << 8 )
elessair	0:f269e3021894	1508	\| ( (uint32_t) buf[5] );
elessair	0:f269e3021894	1509	MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, current time: %lu", t ) );
elessair	0:f269e3021894	1510	#endif
elessair	0:f269e3021894	1511
elessair	0:f269e3021894	1512	memcpy( ssl->handshake->randbytes + 32, buf + 2, 32 );
elessair	0:f269e3021894	1513
elessair	0:f269e3021894	1514	n = buf[34];
elessair	0:f269e3021894	1515
elessair	0:f269e3021894	1516	MBEDTLS_SSL_DEBUG_BUF( 3, "server hello, random bytes", buf + 2, 32 );
elessair	0:f269e3021894	1517
elessair	0:f269e3021894	1518	if( n > 32 )
elessair	0:f269e3021894	1519	{
elessair	0:f269e3021894	1520	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server hello message" ) );
elessair	0:f269e3021894	1521	return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
elessair	0:f269e3021894	1522	}
elessair	0:f269e3021894	1523
elessair	0:f269e3021894	1524	if( ssl->in_hslen > mbedtls_ssl_hs_hdr_len( ssl ) + 39 + n )
elessair	0:f269e3021894	1525	{
elessair	0:f269e3021894	1526	ext_len = ( ( buf[38 + n] << 8 )
elessair	0:f269e3021894	1527	\| ( buf[39 + n] ) );
elessair	0:f269e3021894	1528
elessair	0:f269e3021894	1529	if( ( ext_len > 0 && ext_len < 4 ) \|\|
elessair	0:f269e3021894	1530	ssl->in_hslen != mbedtls_ssl_hs_hdr_len( ssl ) + 40 + n + ext_len )
elessair	0:f269e3021894	1531	{
elessair	0:f269e3021894	1532	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server hello message" ) );
elessair	0:f269e3021894	1533	return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
elessair	0:f269e3021894	1534	}
elessair	0:f269e3021894	1535	}
elessair	0:f269e3021894	1536	else if( ssl->in_hslen == mbedtls_ssl_hs_hdr_len( ssl ) + 38 + n )
elessair	0:f269e3021894	1537	{
elessair	0:f269e3021894	1538	ext_len = 0;
elessair	0:f269e3021894	1539	}
elessair	0:f269e3021894	1540	else
elessair	0:f269e3021894	1541	{
elessair	0:f269e3021894	1542	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server hello message" ) );
elessair	0:f269e3021894	1543	return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
elessair	0:f269e3021894	1544	}
elessair	0:f269e3021894	1545
elessair	0:f269e3021894	1546	/* ciphersuite (used later) */
elessair	0:f269e3021894	1547	i = ( buf[35 + n] << 8 ) \| buf[36 + n];
elessair	0:f269e3021894	1548
elessair	0:f269e3021894	1549	/*
elessair	0:f269e3021894	1550	* Read and check compression
elessair	0:f269e3021894	1551	*/
elessair	0:f269e3021894	1552	comp = buf[37 + n];
elessair	0:f269e3021894	1553
elessair	0:f269e3021894	1554	#if defined(MBEDTLS_ZLIB_SUPPORT)
elessair	0:f269e3021894	1555	/* See comments in ssl_write_client_hello() */
elessair	0:f269e3021894	1556	#if defined(MBEDTLS_SSL_PROTO_DTLS)
elessair	0:f269e3021894	1557	if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
elessair	0:f269e3021894	1558	accept_comp = 0;
elessair	0:f269e3021894	1559	else
elessair	0:f269e3021894	1560	#endif
elessair	0:f269e3021894	1561	accept_comp = 1;
elessair	0:f269e3021894	1562
elessair	0:f269e3021894	1563	if( comp != MBEDTLS_SSL_COMPRESS_NULL &&
elessair	0:f269e3021894	1564	( comp != MBEDTLS_SSL_COMPRESS_DEFLATE \|\| accept_comp == 0 ) )
elessair	0:f269e3021894	1565	#else /* MBEDTLS_ZLIB_SUPPORT */
elessair	0:f269e3021894	1566	if( comp != MBEDTLS_SSL_COMPRESS_NULL )
elessair	0:f269e3021894	1567	#endif/* MBEDTLS_ZLIB_SUPPORT */
elessair	0:f269e3021894	1568	{
elessair	0:f269e3021894	1569	MBEDTLS_SSL_DEBUG_MSG( 1, ( "server hello, bad compression: %d", comp ) );
elessair	0:f269e3021894	1570	return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE );
elessair	0:f269e3021894	1571	}
elessair	0:f269e3021894	1572
elessair	0:f269e3021894	1573	/*
elessair	0:f269e3021894	1574	* Initialize update checksum functions
elessair	0:f269e3021894	1575	*/
elessair	0:f269e3021894	1576	ssl->transform_negotiate->ciphersuite_info = mbedtls_ssl_ciphersuite_from_id( i );
elessair	0:f269e3021894	1577
elessair	0:f269e3021894	1578	if( ssl->transform_negotiate->ciphersuite_info == NULL )
elessair	0:f269e3021894	1579	{
elessair	0:f269e3021894	1580	MBEDTLS_SSL_DEBUG_MSG( 1, ( "ciphersuite info for %04x not found", i ) );
elessair	0:f269e3021894	1581	return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
elessair	0:f269e3021894	1582	}
elessair	0:f269e3021894	1583
elessair	0:f269e3021894	1584	mbedtls_ssl_optimize_checksum( ssl, ssl->transform_negotiate->ciphersuite_info );
elessair	0:f269e3021894	1585
elessair	0:f269e3021894	1586	MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, session id len.: %d", n ) );
elessair	0:f269e3021894	1587	MBEDTLS_SSL_DEBUG_BUF( 3, "server hello, session id", buf + 35, n );
elessair	0:f269e3021894	1588
elessair	0:f269e3021894	1589	/*
elessair	0:f269e3021894	1590	* Check if the session can be resumed
elessair	0:f269e3021894	1591	*/
elessair	0:f269e3021894	1592	if( ssl->handshake->resume == 0 \|\| n == 0 \|\|
elessair	0:f269e3021894	1593	#if defined(MBEDTLS_SSL_RENEGOTIATION)
elessair	0:f269e3021894	1594	ssl->renego_status != MBEDTLS_SSL_INITIAL_HANDSHAKE \|\|
elessair	0:f269e3021894	1595	#endif
elessair	0:f269e3021894	1596	ssl->session_negotiate->ciphersuite != i \|\|
elessair	0:f269e3021894	1597	ssl->session_negotiate->compression != comp \|\|
elessair	0:f269e3021894	1598	ssl->session_negotiate->id_len != n \|\|
elessair	0:f269e3021894	1599	memcmp( ssl->session_negotiate->id, buf + 35, n ) != 0 )
elessair	0:f269e3021894	1600	{
elessair	0:f269e3021894	1601	ssl->state++;
elessair	0:f269e3021894	1602	ssl->handshake->resume = 0;
elessair	0:f269e3021894	1603	#if defined(MBEDTLS_HAVE_TIME)
elessair	0:f269e3021894	1604	ssl->session_negotiate->start = mbedtls_time( NULL );
elessair	0:f269e3021894	1605	#endif
elessair	0:f269e3021894	1606	ssl->session_negotiate->ciphersuite = i;
elessair	0:f269e3021894	1607	ssl->session_negotiate->compression = comp;
elessair	0:f269e3021894	1608	ssl->session_negotiate->id_len = n;
elessair	0:f269e3021894	1609	memcpy( ssl->session_negotiate->id, buf + 35, n );
elessair	0:f269e3021894	1610	}
elessair	0:f269e3021894	1611	else
elessair	0:f269e3021894	1612	{
elessair	0:f269e3021894	1613	ssl->state = MBEDTLS_SSL_SERVER_CHANGE_CIPHER_SPEC;
elessair	0:f269e3021894	1614
elessair	0:f269e3021894	1615	if( ( ret = mbedtls_ssl_derive_keys( ssl ) ) != 0 )
elessair	0:f269e3021894	1616	{
elessair	0:f269e3021894	1617	MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_derive_keys", ret );
elessair	0:f269e3021894	1618	return( ret );
elessair	0:f269e3021894	1619	}
elessair	0:f269e3021894	1620	}
elessair	0:f269e3021894	1621
elessair	0:f269e3021894	1622	MBEDTLS_SSL_DEBUG_MSG( 3, ( "%s session has been resumed",
elessair	0:f269e3021894	1623	ssl->handshake->resume ? "a" : "no" ) );
elessair	0:f269e3021894	1624
elessair	0:f269e3021894	1625	MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, chosen ciphersuite: %04x", i ) );
elessair	0:f269e3021894	1626	MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, compress alg.: %d", buf[37 + n] ) );
elessair	0:f269e3021894	1627
elessair	0:f269e3021894	1628	suite_info = mbedtls_ssl_ciphersuite_from_id( ssl->session_negotiate->ciphersuite );
elessair	0:f269e3021894	1629	if( suite_info == NULL
elessair	0:f269e3021894	1630	#if defined(MBEDTLS_ARC4_C)
elessair	0:f269e3021894	1631	\|\| ( ssl->conf->arc4_disabled &&
elessair	0:f269e3021894	1632	suite_info->cipher == MBEDTLS_CIPHER_ARC4_128 )
elessair	0:f269e3021894	1633	#endif
elessair	0:f269e3021894	1634	)
elessair	0:f269e3021894	1635	{
elessair	0:f269e3021894	1636	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server hello message" ) );
elessair	0:f269e3021894	1637	return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
elessair	0:f269e3021894	1638	}
elessair	0:f269e3021894	1639
elessair	0:f269e3021894	1640	MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, chosen ciphersuite: %s", suite_info->name ) );
elessair	0:f269e3021894	1641
elessair	0:f269e3021894	1642	i = 0;
elessair	0:f269e3021894	1643	while( 1 )
elessair	0:f269e3021894	1644	{
elessair	0:f269e3021894	1645	if( ssl->conf->ciphersuite_list[ssl->minor_ver][i] == 0 )
elessair	0:f269e3021894	1646	{
elessair	0:f269e3021894	1647	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server hello message" ) );
elessair	0:f269e3021894	1648	return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
elessair	0:f269e3021894	1649	}
elessair	0:f269e3021894	1650
elessair	0:f269e3021894	1651	if( ssl->conf->ciphersuite_list[ssl->minor_ver][i++] ==
elessair	0:f269e3021894	1652	ssl->session_negotiate->ciphersuite )
elessair	0:f269e3021894	1653	{
elessair	0:f269e3021894	1654	break;
elessair	0:f269e3021894	1655	}
elessair	0:f269e3021894	1656	}
elessair	0:f269e3021894	1657
elessair	0:f269e3021894	1658	if( comp != MBEDTLS_SSL_COMPRESS_NULL
elessair	0:f269e3021894	1659	#if defined(MBEDTLS_ZLIB_SUPPORT)
elessair	0:f269e3021894	1660	&& comp != MBEDTLS_SSL_COMPRESS_DEFLATE
elessair	0:f269e3021894	1661	#endif
elessair	0:f269e3021894	1662	)
elessair	0:f269e3021894	1663	{
elessair	0:f269e3021894	1664	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server hello message" ) );
elessair	0:f269e3021894	1665	return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
elessair	0:f269e3021894	1666	}
elessair	0:f269e3021894	1667	ssl->session_negotiate->compression = comp;
elessair	0:f269e3021894	1668
elessair	0:f269e3021894	1669	ext = buf + 40 + n;
elessair	0:f269e3021894	1670
elessair	0:f269e3021894	1671	MBEDTLS_SSL_DEBUG_MSG( 2, ( "server hello, total extension length: %d", ext_len ) );
elessair	0:f269e3021894	1672
elessair	0:f269e3021894	1673	while( ext_len )
elessair	0:f269e3021894	1674	{
elessair	0:f269e3021894	1675	unsigned int ext_id = ( ( ext[0] << 8 )
elessair	0:f269e3021894	1676	\| ( ext[1] ) );
elessair	0:f269e3021894	1677	unsigned int ext_size = ( ( ext[2] << 8 )
elessair	0:f269e3021894	1678	\| ( ext[3] ) );
elessair	0:f269e3021894	1679
elessair	0:f269e3021894	1680	if( ext_size + 4 > ext_len )
elessair	0:f269e3021894	1681	{
elessair	0:f269e3021894	1682	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server hello message" ) );
elessair	0:f269e3021894	1683	return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
elessair	0:f269e3021894	1684	}
elessair	0:f269e3021894	1685
elessair	0:f269e3021894	1686	switch( ext_id )
elessair	0:f269e3021894	1687	{
elessair	0:f269e3021894	1688	case MBEDTLS_TLS_EXT_RENEGOTIATION_INFO:
elessair	0:f269e3021894	1689	MBEDTLS_SSL_DEBUG_MSG( 3, ( "found renegotiation extension" ) );
elessair	0:f269e3021894	1690	#if defined(MBEDTLS_SSL_RENEGOTIATION)
elessair	0:f269e3021894	1691	renegotiation_info_seen = 1;
elessair	0:f269e3021894	1692	#endif
elessair	0:f269e3021894	1693
elessair	0:f269e3021894	1694	if( ( ret = ssl_parse_renegotiation_info( ssl, ext + 4,
elessair	0:f269e3021894	1695	ext_size ) ) != 0 )
elessair	0:f269e3021894	1696	return( ret );
elessair	0:f269e3021894	1697
elessair	0:f269e3021894	1698	break;
elessair	0:f269e3021894	1699
elessair	0:f269e3021894	1700	#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
elessair	0:f269e3021894	1701	case MBEDTLS_TLS_EXT_MAX_FRAGMENT_LENGTH:
elessair	0:f269e3021894	1702	MBEDTLS_SSL_DEBUG_MSG( 3, ( "found max_fragment_length extension" ) );
elessair	0:f269e3021894	1703
elessair	0:f269e3021894	1704	if( ( ret = ssl_parse_max_fragment_length_ext( ssl,
elessair	0:f269e3021894	1705	ext + 4, ext_size ) ) != 0 )
elessair	0:f269e3021894	1706	{
elessair	0:f269e3021894	1707	return( ret );
elessair	0:f269e3021894	1708	}
elessair	0:f269e3021894	1709
elessair	0:f269e3021894	1710	break;
elessair	0:f269e3021894	1711	#endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */
elessair	0:f269e3021894	1712
elessair	0:f269e3021894	1713	#if defined(MBEDTLS_SSL_TRUNCATED_HMAC)
elessair	0:f269e3021894	1714	case MBEDTLS_TLS_EXT_TRUNCATED_HMAC:
elessair	0:f269e3021894	1715	MBEDTLS_SSL_DEBUG_MSG( 3, ( "found truncated_hmac extension" ) );
elessair	0:f269e3021894	1716
elessair	0:f269e3021894	1717	if( ( ret = ssl_parse_truncated_hmac_ext( ssl,
elessair	0:f269e3021894	1718	ext + 4, ext_size ) ) != 0 )
elessair	0:f269e3021894	1719	{
elessair	0:f269e3021894	1720	return( ret );
elessair	0:f269e3021894	1721	}
elessair	0:f269e3021894	1722
elessair	0:f269e3021894	1723	break;
elessair	0:f269e3021894	1724	#endif /* MBEDTLS_SSL_TRUNCATED_HMAC */
elessair	0:f269e3021894	1725
elessair	0:f269e3021894	1726	#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
elessair	0:f269e3021894	1727	case MBEDTLS_TLS_EXT_ENCRYPT_THEN_MAC:
elessair	0:f269e3021894	1728	MBEDTLS_SSL_DEBUG_MSG( 3, ( "found encrypt_then_mac extension" ) );
elessair	0:f269e3021894	1729
elessair	0:f269e3021894	1730	if( ( ret = ssl_parse_encrypt_then_mac_ext( ssl,
elessair	0:f269e3021894	1731	ext + 4, ext_size ) ) != 0 )
elessair	0:f269e3021894	1732	{
elessair	0:f269e3021894	1733	return( ret );
elessair	0:f269e3021894	1734	}
elessair	0:f269e3021894	1735
elessair	0:f269e3021894	1736	break;
elessair	0:f269e3021894	1737	#endif /* MBEDTLS_SSL_ENCRYPT_THEN_MAC */
elessair	0:f269e3021894	1738
elessair	0:f269e3021894	1739	#if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET)
elessair	0:f269e3021894	1740	case MBEDTLS_TLS_EXT_EXTENDED_MASTER_SECRET:
elessair	0:f269e3021894	1741	MBEDTLS_SSL_DEBUG_MSG( 3, ( "found extended_master_secret extension" ) );
elessair	0:f269e3021894	1742
elessair	0:f269e3021894	1743	if( ( ret = ssl_parse_extended_ms_ext( ssl,
elessair	0:f269e3021894	1744	ext + 4, ext_size ) ) != 0 )
elessair	0:f269e3021894	1745	{
elessair	0:f269e3021894	1746	return( ret );
elessair	0:f269e3021894	1747	}
elessair	0:f269e3021894	1748
elessair	0:f269e3021894	1749	break;
elessair	0:f269e3021894	1750	#endif /* MBEDTLS_SSL_EXTENDED_MASTER_SECRET */
elessair	0:f269e3021894	1751
elessair	0:f269e3021894	1752	#if defined(MBEDTLS_SSL_SESSION_TICKETS)
elessair	0:f269e3021894	1753	case MBEDTLS_TLS_EXT_SESSION_TICKET:
elessair	0:f269e3021894	1754	MBEDTLS_SSL_DEBUG_MSG( 3, ( "found session_ticket extension" ) );
elessair	0:f269e3021894	1755
elessair	0:f269e3021894	1756	if( ( ret = ssl_parse_session_ticket_ext( ssl,
elessair	0:f269e3021894	1757	ext + 4, ext_size ) ) != 0 )
elessair	0:f269e3021894	1758	{
elessair	0:f269e3021894	1759	return( ret );
elessair	0:f269e3021894	1760	}
elessair	0:f269e3021894	1761
elessair	0:f269e3021894	1762	break;
elessair	0:f269e3021894	1763	#endif /* MBEDTLS_SSL_SESSION_TICKETS */
elessair	0:f269e3021894	1764
elessair	0:f269e3021894	1765	#if defined(MBEDTLS_ECDH_C) \|\| defined(MBEDTLS_ECDSA_C) \|\| \
elessair	0:f269e3021894	1766	defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
elessair	0:f269e3021894	1767	case MBEDTLS_TLS_EXT_SUPPORTED_POINT_FORMATS:
elessair	0:f269e3021894	1768	MBEDTLS_SSL_DEBUG_MSG( 3, ( "found supported_point_formats extension" ) );
elessair	0:f269e3021894	1769
elessair	0:f269e3021894	1770	if( ( ret = ssl_parse_supported_point_formats_ext( ssl,
elessair	0:f269e3021894	1771	ext + 4, ext_size ) ) != 0 )
elessair	0:f269e3021894	1772	{
elessair	0:f269e3021894	1773	return( ret );
elessair	0:f269e3021894	1774	}
elessair	0:f269e3021894	1775
elessair	0:f269e3021894	1776	break;
elessair	0:f269e3021894	1777	#endif /* MBEDTLS_ECDH_C \|\| MBEDTLS_ECDSA_C \|\|
elessair	0:f269e3021894	1778	MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */
elessair	0:f269e3021894	1779
elessair	0:f269e3021894	1780	#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
elessair	0:f269e3021894	1781	case MBEDTLS_TLS_EXT_ECJPAKE_KKPP:
elessair	0:f269e3021894	1782	MBEDTLS_SSL_DEBUG_MSG( 3, ( "found ecjpake_kkpp extension" ) );
elessair	0:f269e3021894	1783
elessair	0:f269e3021894	1784	if( ( ret = ssl_parse_ecjpake_kkpp( ssl,
elessair	0:f269e3021894	1785	ext + 4, ext_size ) ) != 0 )
elessair	0:f269e3021894	1786	{
elessair	0:f269e3021894	1787	return( ret );
elessair	0:f269e3021894	1788	}
elessair	0:f269e3021894	1789
elessair	0:f269e3021894	1790	break;
elessair	0:f269e3021894	1791	#endif /* MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */
elessair	0:f269e3021894	1792
elessair	0:f269e3021894	1793	#if defined(MBEDTLS_SSL_ALPN)
elessair	0:f269e3021894	1794	case MBEDTLS_TLS_EXT_ALPN:
elessair	0:f269e3021894	1795	MBEDTLS_SSL_DEBUG_MSG( 3, ( "found alpn extension" ) );
elessair	0:f269e3021894	1796
elessair	0:f269e3021894	1797	if( ( ret = ssl_parse_alpn_ext( ssl, ext + 4, ext_size ) ) != 0 )
elessair	0:f269e3021894	1798	return( ret );
elessair	0:f269e3021894	1799
elessair	0:f269e3021894	1800	break;
elessair	0:f269e3021894	1801	#endif /* MBEDTLS_SSL_ALPN */
elessair	0:f269e3021894	1802
elessair	0:f269e3021894	1803	default:
elessair	0:f269e3021894	1804	MBEDTLS_SSL_DEBUG_MSG( 3, ( "unknown extension found: %d (ignoring)",
elessair	0:f269e3021894	1805	ext_id ) );
elessair	0:f269e3021894	1806	}
elessair	0:f269e3021894	1807
elessair	0:f269e3021894	1808	ext_len -= 4 + ext_size;
elessair	0:f269e3021894	1809	ext += 4 + ext_size;
elessair	0:f269e3021894	1810
elessair	0:f269e3021894	1811	if( ext_len > 0 && ext_len < 4 )
elessair	0:f269e3021894	1812	{
elessair	0:f269e3021894	1813	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server hello message" ) );
elessair	0:f269e3021894	1814	return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
elessair	0:f269e3021894	1815	}
elessair	0:f269e3021894	1816	}
elessair	0:f269e3021894	1817
elessair	0:f269e3021894	1818	/*
elessair	0:f269e3021894	1819	* Renegotiation security checks
elessair	0:f269e3021894	1820	*/
elessair	0:f269e3021894	1821	if( ssl->secure_renegotiation == MBEDTLS_SSL_LEGACY_RENEGOTIATION &&
elessair	0:f269e3021894	1822	ssl->conf->allow_legacy_renegotiation == MBEDTLS_SSL_LEGACY_BREAK_HANDSHAKE )
elessair	0:f269e3021894	1823	{
elessair	0:f269e3021894	1824	MBEDTLS_SSL_DEBUG_MSG( 1, ( "legacy renegotiation, breaking off handshake" ) );
elessair	0:f269e3021894	1825	handshake_failure = 1;
elessair	0:f269e3021894	1826	}
elessair	0:f269e3021894	1827	#if defined(MBEDTLS_SSL_RENEGOTIATION)
elessair	0:f269e3021894	1828	else if( ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS &&
elessair	0:f269e3021894	1829	ssl->secure_renegotiation == MBEDTLS_SSL_SECURE_RENEGOTIATION &&
elessair	0:f269e3021894	1830	renegotiation_info_seen == 0 )
elessair	0:f269e3021894	1831	{
elessair	0:f269e3021894	1832	MBEDTLS_SSL_DEBUG_MSG( 1, ( "renegotiation_info extension missing (secure)" ) );
elessair	0:f269e3021894	1833	handshake_failure = 1;
elessair	0:f269e3021894	1834	}
elessair	0:f269e3021894	1835	else if( ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS &&
elessair	0:f269e3021894	1836	ssl->secure_renegotiation == MBEDTLS_SSL_LEGACY_RENEGOTIATION &&
elessair	0:f269e3021894	1837	ssl->conf->allow_legacy_renegotiation == MBEDTLS_SSL_LEGACY_NO_RENEGOTIATION )
elessair	0:f269e3021894	1838	{
elessair	0:f269e3021894	1839	MBEDTLS_SSL_DEBUG_MSG( 1, ( "legacy renegotiation not allowed" ) );
elessair	0:f269e3021894	1840	handshake_failure = 1;
elessair	0:f269e3021894	1841	}
elessair	0:f269e3021894	1842	else if( ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS &&
elessair	0:f269e3021894	1843	ssl->secure_renegotiation == MBEDTLS_SSL_LEGACY_RENEGOTIATION &&
elessair	0:f269e3021894	1844	renegotiation_info_seen == 1 )
elessair	0:f269e3021894	1845	{
elessair	0:f269e3021894	1846	MBEDTLS_SSL_DEBUG_MSG( 1, ( "renegotiation_info extension present (legacy)" ) );
elessair	0:f269e3021894	1847	handshake_failure = 1;
elessair	0:f269e3021894	1848	}
elessair	0:f269e3021894	1849	#endif /* MBEDTLS_SSL_RENEGOTIATION */
elessair	0:f269e3021894	1850
elessair	0:f269e3021894	1851	if( handshake_failure == 1 )
elessair	0:f269e3021894	1852	{
elessair	0:f269e3021894	1853	if( ( ret = mbedtls_ssl_send_fatal_handshake_failure( ssl ) ) != 0 )
elessair	0:f269e3021894	1854	return( ret );
elessair	0:f269e3021894	1855
elessair	0:f269e3021894	1856	return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
elessair	0:f269e3021894	1857	}
elessair	0:f269e3021894	1858
elessair	0:f269e3021894	1859	MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse server hello" ) );
elessair	0:f269e3021894	1860
elessair	0:f269e3021894	1861	return( 0 );
elessair	0:f269e3021894	1862	}
elessair	0:f269e3021894	1863
elessair	0:f269e3021894	1864	#if defined(MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED) \|\| \
elessair	0:f269e3021894	1865	defined(MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED)
elessair	0:f269e3021894	1866	static int ssl_parse_server_dh_params( mbedtls_ssl_context ssl, unsigned char *p,
elessair	0:f269e3021894	1867	unsigned char *end )
elessair	0:f269e3021894	1868	{
elessair	0:f269e3021894	1869	int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE;
elessair	0:f269e3021894	1870
elessair	0:f269e3021894	1871	/*
elessair	0:f269e3021894	1872	* Ephemeral DH parameters:
elessair	0:f269e3021894	1873	*
elessair	0:f269e3021894	1874	* struct {
elessair	0:f269e3021894	1875	* opaque dh_p<1..2^16-1>;
elessair	0:f269e3021894	1876	* opaque dh_g<1..2^16-1>;
elessair	0:f269e3021894	1877	* opaque dh_Ys<1..2^16-1>;
elessair	0:f269e3021894	1878	* } ServerDHParams;
elessair	0:f269e3021894	1879	*/
elessair	0:f269e3021894	1880	if( ( ret = mbedtls_dhm_read_params( &ssl->handshake->dhm_ctx, p, end ) ) != 0 )
elessair	0:f269e3021894	1881	{
elessair	0:f269e3021894	1882	MBEDTLS_SSL_DEBUG_RET( 2, ( "mbedtls_dhm_read_params" ), ret );
elessair	0:f269e3021894	1883	return( ret );
elessair	0:f269e3021894	1884	}
elessair	0:f269e3021894	1885
elessair	0:f269e3021894	1886	if( ssl->handshake->dhm_ctx.len * 8 < ssl->conf->dhm_min_bitlen )
elessair	0:f269e3021894	1887	{
elessair	0:f269e3021894	1888	MBEDTLS_SSL_DEBUG_MSG( 1, ( "DHM prime too short: %d < %d",
elessair	0:f269e3021894	1889	ssl->handshake->dhm_ctx.len * 8,
elessair	0:f269e3021894	1890	ssl->conf->dhm_min_bitlen ) );
elessair	0:f269e3021894	1891	return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
elessair	0:f269e3021894	1892	}
elessair	0:f269e3021894	1893
elessair	0:f269e3021894	1894	MBEDTLS_SSL_DEBUG_MPI( 3, "DHM: P ", &ssl->handshake->dhm_ctx.P );
elessair	0:f269e3021894	1895	MBEDTLS_SSL_DEBUG_MPI( 3, "DHM: G ", &ssl->handshake->dhm_ctx.G );
elessair	0:f269e3021894	1896	MBEDTLS_SSL_DEBUG_MPI( 3, "DHM: GY", &ssl->handshake->dhm_ctx.GY );
elessair	0:f269e3021894	1897
elessair	0:f269e3021894	1898	return( ret );
elessair	0:f269e3021894	1899	}
elessair	0:f269e3021894	1900	#endif /* MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED \|\|
elessair	0:f269e3021894	1901	MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED */
elessair	0:f269e3021894	1902
elessair	0:f269e3021894	1903	#if defined(MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED) \|\| \
elessair	0:f269e3021894	1904	defined(MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED) \|\| \
elessair	0:f269e3021894	1905	defined(MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED) \|\| \
elessair	0:f269e3021894	1906	defined(MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED) \|\| \
elessair	0:f269e3021894	1907	defined(MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED)
elessair	0:f269e3021894	1908	static int ssl_check_server_ecdh_params( const mbedtls_ssl_context *ssl )
elessair	0:f269e3021894	1909	{
elessair	0:f269e3021894	1910	const mbedtls_ecp_curve_info *curve_info;
elessair	0:f269e3021894	1911
elessair	0:f269e3021894	1912	curve_info = mbedtls_ecp_curve_info_from_grp_id( ssl->handshake->ecdh_ctx.grp.id );
elessair	0:f269e3021894	1913	if( curve_info == NULL )
elessair	0:f269e3021894	1914	{
elessair	0:f269e3021894	1915	MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
elessair	0:f269e3021894	1916	return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
elessair	0:f269e3021894	1917	}
elessair	0:f269e3021894	1918
elessair	0:f269e3021894	1919	MBEDTLS_SSL_DEBUG_MSG( 2, ( "ECDH curve: %s", curve_info->name ) );
elessair	0:f269e3021894	1920
elessair	0:f269e3021894	1921	#if defined(MBEDTLS_ECP_C)
elessair	0:f269e3021894	1922	if( mbedtls_ssl_check_curve( ssl, ssl->handshake->ecdh_ctx.grp.id ) != 0 )
elessair	0:f269e3021894	1923	#else
elessair	0:f269e3021894	1924	if( ssl->handshake->ecdh_ctx.grp.nbits < 163 \|\|
elessair	0:f269e3021894	1925	ssl->handshake->ecdh_ctx.grp.nbits > 521 )
elessair	0:f269e3021894	1926	#endif
elessair	0:f269e3021894	1927	return( -1 );
elessair	0:f269e3021894	1928
elessair	0:f269e3021894	1929	MBEDTLS_SSL_DEBUG_ECP( 3, "ECDH: Qp", &ssl->handshake->ecdh_ctx.Qp );
elessair	0:f269e3021894	1930
elessair	0:f269e3021894	1931	return( 0 );
elessair	0:f269e3021894	1932	}
elessair	0:f269e3021894	1933	#endif /* MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED \|\|
elessair	0:f269e3021894	1934	MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED \|\|
elessair	0:f269e3021894	1935	MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED \|\|
elessair	0:f269e3021894	1936	MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED \|\|
elessair	0:f269e3021894	1937	MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED */
elessair	0:f269e3021894	1938
elessair	0:f269e3021894	1939	#if defined(MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED) \|\| \
elessair	0:f269e3021894	1940	defined(MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED) \|\| \
elessair	0:f269e3021894	1941	defined(MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED)
elessair	0:f269e3021894	1942	static int ssl_parse_server_ecdh_params( mbedtls_ssl_context *ssl,
elessair	0:f269e3021894	1943	unsigned char **p,
elessair	0:f269e3021894	1944	unsigned char *end )
elessair	0:f269e3021894	1945	{
elessair	0:f269e3021894	1946	int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE;
elessair	0:f269e3021894	1947
elessair	0:f269e3021894	1948	/*
elessair	0:f269e3021894	1949	* Ephemeral ECDH parameters:
elessair	0:f269e3021894	1950	*
elessair	0:f269e3021894	1951	* struct {
elessair	0:f269e3021894	1952	* ECParameters curve_params;
elessair	0:f269e3021894	1953	* ECPoint public;
elessair	0:f269e3021894	1954	* } ServerECDHParams;
elessair	0:f269e3021894	1955	*/
elessair	0:f269e3021894	1956	if( ( ret = mbedtls_ecdh_read_params( &ssl->handshake->ecdh_ctx,
elessair	0:f269e3021894	1957	(const unsigned char **) p, end ) ) != 0 )
elessair	0:f269e3021894	1958	{
elessair	0:f269e3021894	1959	MBEDTLS_SSL_DEBUG_RET( 1, ( "mbedtls_ecdh_read_params" ), ret );
elessair	0:f269e3021894	1960	return( ret );
elessair	0:f269e3021894	1961	}
elessair	0:f269e3021894	1962
elessair	0:f269e3021894	1963	if( ssl_check_server_ecdh_params( ssl ) != 0 )
elessair	0:f269e3021894	1964	{
elessair	0:f269e3021894	1965	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server key exchange message (ECDHE curve)" ) );
elessair	0:f269e3021894	1966	return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
elessair	0:f269e3021894	1967	}
elessair	0:f269e3021894	1968
elessair	0:f269e3021894	1969	return( ret );
elessair	0:f269e3021894	1970	}
elessair	0:f269e3021894	1971	#endif /* MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED \|\|
elessair	0:f269e3021894	1972	MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED \|\|
elessair	0:f269e3021894	1973	MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED */
elessair	0:f269e3021894	1974
elessair	0:f269e3021894	1975	#if defined(MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED)
elessair	0:f269e3021894	1976	static int ssl_parse_server_psk_hint( mbedtls_ssl_context *ssl,
elessair	0:f269e3021894	1977	unsigned char **p,
elessair	0:f269e3021894	1978	unsigned char *end )
elessair	0:f269e3021894	1979	{
elessair	0:f269e3021894	1980	int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE;
elessair	0:f269e3021894	1981	size_t len;
elessair	0:f269e3021894	1982	((void) ssl);
elessair	0:f269e3021894	1983
elessair	0:f269e3021894	1984	/*
elessair	0:f269e3021894	1985	* PSK parameters:
elessair	0:f269e3021894	1986	*
elessair	0:f269e3021894	1987	* opaque psk_identity_hint<0..2^16-1>;
elessair	0:f269e3021894	1988	*/
elessair	0:f269e3021894	1989	len = (p)[0] << 8 \| (p)[1];
elessair	0:f269e3021894	1990	*p += 2;
elessair	0:f269e3021894	1991
elessair	0:f269e3021894	1992	if( (*p) + len > end )
elessair	0:f269e3021894	1993	{
elessair	0:f269e3021894	1994	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server key exchange message (psk_identity_hint length)" ) );
elessair	0:f269e3021894	1995	return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
elessair	0:f269e3021894	1996	}
elessair	0:f269e3021894	1997
elessair	0:f269e3021894	1998	/*
elessair	0:f269e3021894	1999	* Note: we currently ignore the PKS identity hint, as we only allow one
elessair	0:f269e3021894	2000	* PSK to be provisionned on the client. This could be changed later if
elessair	0:f269e3021894	2001	* someone needs that feature.
elessair	0:f269e3021894	2002	*/
elessair	0:f269e3021894	2003	*p += len;
elessair	0:f269e3021894	2004	ret = 0;
elessair	0:f269e3021894	2005
elessair	0:f269e3021894	2006	return( ret );
elessair	0:f269e3021894	2007	}
elessair	0:f269e3021894	2008	#endif /* MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED */
elessair	0:f269e3021894	2009
elessair	0:f269e3021894	2010	#if defined(MBEDTLS_KEY_EXCHANGE_RSA_ENABLED) \|\| \
elessair	0:f269e3021894	2011	defined(MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED)
elessair	0:f269e3021894	2012	/*
elessair	0:f269e3021894	2013	* Generate a pre-master secret and encrypt it with the server's RSA key
elessair	0:f269e3021894	2014	*/
elessair	0:f269e3021894	2015	static int ssl_write_encrypted_pms( mbedtls_ssl_context *ssl,
elessair	0:f269e3021894	2016	size_t offset, size_t *olen,
elessair	0:f269e3021894	2017	size_t pms_offset )
elessair	0:f269e3021894	2018	{
elessair	0:f269e3021894	2019	int ret;
elessair	0:f269e3021894	2020	size_t len_bytes = ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 ? 0 : 2;
elessair	0:f269e3021894	2021	unsigned char *p = ssl->handshake->premaster + pms_offset;
elessair	0:f269e3021894	2022
elessair	0:f269e3021894	2023	if( offset + len_bytes > MBEDTLS_SSL_MAX_CONTENT_LEN )
elessair	0:f269e3021894	2024	{
elessair	0:f269e3021894	2025	MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small for encrypted pms" ) );
elessair	0:f269e3021894	2026	return( MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL );
elessair	0:f269e3021894	2027	}
elessair	0:f269e3021894	2028
elessair	0:f269e3021894	2029	/*
elessair	0:f269e3021894	2030	* Generate (part of) the pre-master as
elessair	0:f269e3021894	2031	* struct {
elessair	0:f269e3021894	2032	* ProtocolVersion client_version;
elessair	0:f269e3021894	2033	* opaque random[46];
elessair	0:f269e3021894	2034	* } PreMasterSecret;
elessair	0:f269e3021894	2035	*/
elessair	0:f269e3021894	2036	mbedtls_ssl_write_version( ssl->conf->max_major_ver, ssl->conf->max_minor_ver,
elessair	0:f269e3021894	2037	ssl->conf->transport, p );
elessair	0:f269e3021894	2038
elessair	0:f269e3021894	2039	if( ( ret = ssl->conf->f_rng( ssl->conf->p_rng, p + 2, 46 ) ) != 0 )
elessair	0:f269e3021894	2040	{
elessair	0:f269e3021894	2041	MBEDTLS_SSL_DEBUG_RET( 1, "f_rng", ret );
elessair	0:f269e3021894	2042	return( ret );
elessair	0:f269e3021894	2043	}
elessair	0:f269e3021894	2044
elessair	0:f269e3021894	2045	ssl->handshake->pmslen = 48;
elessair	0:f269e3021894	2046
elessair	0:f269e3021894	2047	if( ssl->session_negotiate->peer_cert == NULL )
elessair	0:f269e3021894	2048	{
elessair	0:f269e3021894	2049	MBEDTLS_SSL_DEBUG_MSG( 2, ( "certificate required" ) );
elessair	0:f269e3021894	2050	return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE );
elessair	0:f269e3021894	2051	}
elessair	0:f269e3021894	2052
elessair	0:f269e3021894	2053	/*
elessair	0:f269e3021894	2054	* Now write it out, encrypted
elessair	0:f269e3021894	2055	*/
elessair	0:f269e3021894	2056	if( ! mbedtls_pk_can_do( &ssl->session_negotiate->peer_cert->pk,
elessair	0:f269e3021894	2057	MBEDTLS_PK_RSA ) )
elessair	0:f269e3021894	2058	{
elessair	0:f269e3021894	2059	MBEDTLS_SSL_DEBUG_MSG( 1, ( "certificate key type mismatch" ) );
elessair	0:f269e3021894	2060	return( MBEDTLS_ERR_SSL_PK_TYPE_MISMATCH );
elessair	0:f269e3021894	2061	}
elessair	0:f269e3021894	2062
elessair	0:f269e3021894	2063	if( ( ret = mbedtls_pk_encrypt( &ssl->session_negotiate->peer_cert->pk,
elessair	0:f269e3021894	2064	p, ssl->handshake->pmslen,
elessair	0:f269e3021894	2065	ssl->out_msg + offset + len_bytes, olen,
elessair	0:f269e3021894	2066	MBEDTLS_SSL_MAX_CONTENT_LEN - offset - len_bytes,
elessair	0:f269e3021894	2067	ssl->conf->f_rng, ssl->conf->p_rng ) ) != 0 )
elessair	0:f269e3021894	2068	{
elessair	0:f269e3021894	2069	MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_rsa_pkcs1_encrypt", ret );
elessair	0:f269e3021894	2070	return( ret );
elessair	0:f269e3021894	2071	}
elessair	0:f269e3021894	2072
elessair	0:f269e3021894	2073	#if defined(MBEDTLS_SSL_PROTO_TLS1) \|\| defined(MBEDTLS_SSL_PROTO_TLS1_1) \|\| \
elessair	0:f269e3021894	2074	defined(MBEDTLS_SSL_PROTO_TLS1_2)
elessair	0:f269e3021894	2075	if( len_bytes == 2 )
elessair	0:f269e3021894	2076	{
elessair	0:f269e3021894	2077	ssl->out_msg[offset+0] = (unsigned char)( *olen >> 8 );
elessair	0:f269e3021894	2078	ssl->out_msg[offset+1] = (unsigned char)( *olen );
elessair	0:f269e3021894	2079	*olen += 2;
elessair	0:f269e3021894	2080	}
elessair	0:f269e3021894	2081	#endif
elessair	0:f269e3021894	2082
elessair	0:f269e3021894	2083	return( 0 );
elessair	0:f269e3021894	2084	}
elessair	0:f269e3021894	2085	#endif /* MBEDTLS_KEY_EXCHANGE_RSA_ENABLED \|\|
elessair	0:f269e3021894	2086	MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED */
elessair	0:f269e3021894	2087
elessair	0:f269e3021894	2088	#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
elessair	0:f269e3021894	2089	#if defined(MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED) \|\| \
elessair	0:f269e3021894	2090	defined(MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED) \|\| \
elessair	0:f269e3021894	2091	defined(MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED)
elessair	0:f269e3021894	2092	static int ssl_parse_signature_algorithm( mbedtls_ssl_context *ssl,
elessair	0:f269e3021894	2093	unsigned char **p,
elessair	0:f269e3021894	2094	unsigned char *end,
elessair	0:f269e3021894	2095	mbedtls_md_type_t *md_alg,
elessair	0:f269e3021894	2096	mbedtls_pk_type_t *pk_alg )
elessair	0:f269e3021894	2097	{
elessair	0:f269e3021894	2098	((void) ssl);
elessair	0:f269e3021894	2099	*md_alg = MBEDTLS_MD_NONE;
elessair	0:f269e3021894	2100	*pk_alg = MBEDTLS_PK_NONE;
elessair	0:f269e3021894	2101
elessair	0:f269e3021894	2102	/* Only in TLS 1.2 */
elessair	0:f269e3021894	2103	if( ssl->minor_ver != MBEDTLS_SSL_MINOR_VERSION_3 )
elessair	0:f269e3021894	2104	{
elessair	0:f269e3021894	2105	return( 0 );
elessair	0:f269e3021894	2106	}
elessair	0:f269e3021894	2107
elessair	0:f269e3021894	2108	if( (*p) + 2 > end )
elessair	0:f269e3021894	2109	return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
elessair	0:f269e3021894	2110
elessair	0:f269e3021894	2111	/*
elessair	0:f269e3021894	2112	* Get hash algorithm
elessair	0:f269e3021894	2113	*/
elessair	0:f269e3021894	2114	if( ( md_alg = mbedtls_ssl_md_alg_from_hash( (p)[0] ) ) == MBEDTLS_MD_NONE )
elessair	0:f269e3021894	2115	{
elessair	0:f269e3021894	2116	MBEDTLS_SSL_DEBUG_MSG( 1, ( "Server used unsupported "
elessair	0:f269e3021894	2117	"HashAlgorithm %d", *(p)[0] ) );
elessair	0:f269e3021894	2118	return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
elessair	0:f269e3021894	2119	}
elessair	0:f269e3021894	2120
elessair	0:f269e3021894	2121	/*
elessair	0:f269e3021894	2122	* Get signature algorithm
elessair	0:f269e3021894	2123	*/
elessair	0:f269e3021894	2124	if( ( pk_alg = mbedtls_ssl_pk_alg_from_sig( (p)[1] ) ) == MBEDTLS_PK_NONE )
elessair	0:f269e3021894	2125	{
elessair	0:f269e3021894	2126	MBEDTLS_SSL_DEBUG_MSG( 1, ( "server used unsupported "
elessair	0:f269e3021894	2127	"SignatureAlgorithm %d", (*p)[1] ) );
elessair	0:f269e3021894	2128	return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
elessair	0:f269e3021894	2129	}
elessair	0:f269e3021894	2130
elessair	0:f269e3021894	2131	/*
elessair	0:f269e3021894	2132	* Check if the hash is acceptable
elessair	0:f269e3021894	2133	*/
elessair	0:f269e3021894	2134	if( mbedtls_ssl_check_sig_hash( ssl, *md_alg ) != 0 )
elessair	0:f269e3021894	2135	{
elessair	0:f269e3021894	2136	MBEDTLS_SSL_DEBUG_MSG( 1, ( "server used HashAlgorithm "
elessair	0:f269e3021894	2137	"that was not offered" ) );
elessair	0:f269e3021894	2138	return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
elessair	0:f269e3021894	2139	}
elessair	0:f269e3021894	2140
elessair	0:f269e3021894	2141	MBEDTLS_SSL_DEBUG_MSG( 2, ( "Server used SignatureAlgorithm %d", (*p)[1] ) );
elessair	0:f269e3021894	2142	MBEDTLS_SSL_DEBUG_MSG( 2, ( "Server used HashAlgorithm %d", (*p)[0] ) );
elessair	0:f269e3021894	2143	*p += 2;
elessair	0:f269e3021894	2144
elessair	0:f269e3021894	2145	return( 0 );
elessair	0:f269e3021894	2146	}
elessair	0:f269e3021894	2147	#endif /* MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED \|\|
elessair	0:f269e3021894	2148	MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED \|\|
elessair	0:f269e3021894	2149	MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED */
elessair	0:f269e3021894	2150	#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
elessair	0:f269e3021894	2151
elessair	0:f269e3021894	2152	#if defined(MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED) \|\| \
elessair	0:f269e3021894	2153	defined(MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED)
elessair	0:f269e3021894	2154	static int ssl_get_ecdh_params_from_cert( mbedtls_ssl_context *ssl )
elessair	0:f269e3021894	2155	{
elessair	0:f269e3021894	2156	int ret;
elessair	0:f269e3021894	2157	const mbedtls_ecp_keypair *peer_key;
elessair	0:f269e3021894	2158
elessair	0:f269e3021894	2159	if( ssl->session_negotiate->peer_cert == NULL )
elessair	0:f269e3021894	2160	{
elessair	0:f269e3021894	2161	MBEDTLS_SSL_DEBUG_MSG( 2, ( "certificate required" ) );
elessair	0:f269e3021894	2162	return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE );
elessair	0:f269e3021894	2163	}
elessair	0:f269e3021894	2164
elessair	0:f269e3021894	2165	if( ! mbedtls_pk_can_do( &ssl->session_negotiate->peer_cert->pk,
elessair	0:f269e3021894	2166	MBEDTLS_PK_ECKEY ) )
elessair	0:f269e3021894	2167	{
elessair	0:f269e3021894	2168	MBEDTLS_SSL_DEBUG_MSG( 1, ( "server key not ECDH capable" ) );
elessair	0:f269e3021894	2169	return( MBEDTLS_ERR_SSL_PK_TYPE_MISMATCH );
elessair	0:f269e3021894	2170	}
elessair	0:f269e3021894	2171
elessair	0:f269e3021894	2172	peer_key = mbedtls_pk_ec( ssl->session_negotiate->peer_cert->pk );
elessair	0:f269e3021894	2173
elessair	0:f269e3021894	2174	if( ( ret = mbedtls_ecdh_get_params( &ssl->handshake->ecdh_ctx, peer_key,
elessair	0:f269e3021894	2175	MBEDTLS_ECDH_THEIRS ) ) != 0 )
elessair	0:f269e3021894	2176	{
elessair	0:f269e3021894	2177	MBEDTLS_SSL_DEBUG_RET( 1, ( "mbedtls_ecdh_get_params" ), ret );
elessair	0:f269e3021894	2178	return( ret );
elessair	0:f269e3021894	2179	}
elessair	0:f269e3021894	2180
elessair	0:f269e3021894	2181	if( ssl_check_server_ecdh_params( ssl ) != 0 )
elessair	0:f269e3021894	2182	{
elessair	0:f269e3021894	2183	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server certificate (ECDH curve)" ) );
elessair	0:f269e3021894	2184	return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE );
elessair	0:f269e3021894	2185	}
elessair	0:f269e3021894	2186
elessair	0:f269e3021894	2187	return( ret );
elessair	0:f269e3021894	2188	}
elessair	0:f269e3021894	2189	#endif /* MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED) \|\|
elessair	0:f269e3021894	2190	MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED */
elessair	0:f269e3021894	2191
elessair	0:f269e3021894	2192	static int ssl_parse_server_key_exchange( mbedtls_ssl_context *ssl )
elessair	0:f269e3021894	2193	{
elessair	0:f269e3021894	2194	int ret;
elessair	0:f269e3021894	2195	const mbedtls_ssl_ciphersuite_t *ciphersuite_info = ssl->transform_negotiate->ciphersuite_info;
elessair	0:f269e3021894	2196	unsigned char p, end;
elessair	0:f269e3021894	2197
elessair	0:f269e3021894	2198	MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse server key exchange" ) );
elessair	0:f269e3021894	2199
elessair	0:f269e3021894	2200	#if defined(MBEDTLS_KEY_EXCHANGE_RSA_ENABLED)
elessair	0:f269e3021894	2201	if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA )
elessair	0:f269e3021894	2202	{
elessair	0:f269e3021894	2203	MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip parse server key exchange" ) );
elessair	0:f269e3021894	2204	ssl->state++;
elessair	0:f269e3021894	2205	return( 0 );
elessair	0:f269e3021894	2206	}
elessair	0:f269e3021894	2207	((void) p);
elessair	0:f269e3021894	2208	((void) end);
elessair	0:f269e3021894	2209	#endif
elessair	0:f269e3021894	2210
elessair	0:f269e3021894	2211	#if defined(MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED) \|\| \
elessair	0:f269e3021894	2212	defined(MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED)
elessair	0:f269e3021894	2213	if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDH_RSA \|\|
elessair	0:f269e3021894	2214	ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA )
elessair	0:f269e3021894	2215	{
elessair	0:f269e3021894	2216	if( ( ret = ssl_get_ecdh_params_from_cert( ssl ) ) != 0 )
elessair	0:f269e3021894	2217	{
elessair	0:f269e3021894	2218	MBEDTLS_SSL_DEBUG_RET( 1, "ssl_get_ecdh_params_from_cert", ret );
elessair	0:f269e3021894	2219	return( ret );
elessair	0:f269e3021894	2220	}
elessair	0:f269e3021894	2221
elessair	0:f269e3021894	2222	MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip parse server key exchange" ) );
elessair	0:f269e3021894	2223	ssl->state++;
elessair	0:f269e3021894	2224	return( 0 );
elessair	0:f269e3021894	2225	}
elessair	0:f269e3021894	2226	((void) p);
elessair	0:f269e3021894	2227	((void) end);
elessair	0:f269e3021894	2228	#endif /* MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED \|\|
elessair	0:f269e3021894	2229	MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED */
elessair	0:f269e3021894	2230
elessair	0:f269e3021894	2231	if( ( ret = mbedtls_ssl_read_record( ssl ) ) != 0 )
elessair	0:f269e3021894	2232	{
elessair	0:f269e3021894	2233	MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_read_record", ret );
elessair	0:f269e3021894	2234	return( ret );
elessair	0:f269e3021894	2235	}
elessair	0:f269e3021894	2236
elessair	0:f269e3021894	2237	if( ssl->in_msgtype != MBEDTLS_SSL_MSG_HANDSHAKE )
elessair	0:f269e3021894	2238	{
elessair	0:f269e3021894	2239	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server key exchange message" ) );
elessair	0:f269e3021894	2240	return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE );
elessair	0:f269e3021894	2241	}
elessair	0:f269e3021894	2242
elessair	0:f269e3021894	2243	/*
elessair	0:f269e3021894	2244	* ServerKeyExchange may be skipped with PSK and RSA-PSK when the server
elessair	0:f269e3021894	2245	* doesn't use a psk_identity_hint
elessair	0:f269e3021894	2246	*/
elessair	0:f269e3021894	2247	if( ssl->in_msg[0] != MBEDTLS_SSL_HS_SERVER_KEY_EXCHANGE )
elessair	0:f269e3021894	2248	{
elessair	0:f269e3021894	2249	if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_PSK \|\|
elessair	0:f269e3021894	2250	ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA_PSK )
elessair	0:f269e3021894	2251	{
elessair	0:f269e3021894	2252	ssl->record_read = 1;
elessair	0:f269e3021894	2253	goto exit;
elessair	0:f269e3021894	2254	}
elessair	0:f269e3021894	2255
elessair	0:f269e3021894	2256	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server key exchange message" ) );
elessair	0:f269e3021894	2257	return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE );
elessair	0:f269e3021894	2258	}
elessair	0:f269e3021894	2259
elessair	0:f269e3021894	2260	p = ssl->in_msg + mbedtls_ssl_hs_hdr_len( ssl );
elessair	0:f269e3021894	2261	end = ssl->in_msg + ssl->in_hslen;
elessair	0:f269e3021894	2262	MBEDTLS_SSL_DEBUG_BUF( 3, "server key exchange", p, end - p );
elessair	0:f269e3021894	2263
elessair	0:f269e3021894	2264	#if defined(MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED)
elessair	0:f269e3021894	2265	if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_PSK \|\|
elessair	0:f269e3021894	2266	ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA_PSK \|\|
elessair	0:f269e3021894	2267	ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_PSK \|\|
elessair	0:f269e3021894	2268	ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_PSK )
elessair	0:f269e3021894	2269	{
elessair	0:f269e3021894	2270	if( ssl_parse_server_psk_hint( ssl, &p, end ) != 0 )
elessair	0:f269e3021894	2271	{
elessair	0:f269e3021894	2272	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server key exchange message" ) );
elessair	0:f269e3021894	2273	return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
elessair	0:f269e3021894	2274	}
elessair	0:f269e3021894	2275	} /* FALLTROUGH */
elessair	0:f269e3021894	2276	#endif /* MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED */
elessair	0:f269e3021894	2277
elessair	0:f269e3021894	2278	#if defined(MBEDTLS_KEY_EXCHANGE_PSK_ENABLED) \|\| \
elessair	0:f269e3021894	2279	defined(MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED)
elessair	0:f269e3021894	2280	if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_PSK \|\|
elessair	0:f269e3021894	2281	ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA_PSK )
elessair	0:f269e3021894	2282	; /* nothing more to do */
elessair	0:f269e3021894	2283	else
elessair	0:f269e3021894	2284	#endif /* MBEDTLS_KEY_EXCHANGE_PSK_ENABLED \|\|
elessair	0:f269e3021894	2285	MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED */
elessair	0:f269e3021894	2286	#if defined(MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED) \|\| \
elessair	0:f269e3021894	2287	defined(MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED)
elessair	0:f269e3021894	2288	if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_RSA \|\|
elessair	0:f269e3021894	2289	ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_PSK )
elessair	0:f269e3021894	2290	{
elessair	0:f269e3021894	2291	if( ssl_parse_server_dh_params( ssl, &p, end ) != 0 )
elessair	0:f269e3021894	2292	{
elessair	0:f269e3021894	2293	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server key exchange message" ) );
elessair	0:f269e3021894	2294	return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
elessair	0:f269e3021894	2295	}
elessair	0:f269e3021894	2296	}
elessair	0:f269e3021894	2297	else
elessair	0:f269e3021894	2298	#endif /* MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED \|\|
elessair	0:f269e3021894	2299	MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED */
elessair	0:f269e3021894	2300	#if defined(MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED) \|\| \
elessair	0:f269e3021894	2301	defined(MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED) \|\| \
elessair	0:f269e3021894	2302	defined(MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED)
elessair	0:f269e3021894	2303	if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_RSA \|\|
elessair	0:f269e3021894	2304	ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_PSK \|\|
elessair	0:f269e3021894	2305	ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA )
elessair	0:f269e3021894	2306	{
elessair	0:f269e3021894	2307	if( ssl_parse_server_ecdh_params( ssl, &p, end ) != 0 )
elessair	0:f269e3021894	2308	{
elessair	0:f269e3021894	2309	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server key exchange message" ) );
elessair	0:f269e3021894	2310	return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
elessair	0:f269e3021894	2311	}
elessair	0:f269e3021894	2312	}
elessair	0:f269e3021894	2313	else
elessair	0:f269e3021894	2314	#endif /* MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED \|\|
elessair	0:f269e3021894	2315	MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED \|\|
elessair	0:f269e3021894	2316	MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED */
elessair	0:f269e3021894	2317	#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
elessair	0:f269e3021894	2318	if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECJPAKE )
elessair	0:f269e3021894	2319	{
elessair	0:f269e3021894	2320	ret = mbedtls_ecjpake_read_round_two( &ssl->handshake->ecjpake_ctx,
elessair	0:f269e3021894	2321	p, end - p );
elessair	0:f269e3021894	2322	if( ret != 0 )
elessair	0:f269e3021894	2323	{
elessair	0:f269e3021894	2324	MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecjpake_read_round_two", ret );
elessair	0:f269e3021894	2325	return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
elessair	0:f269e3021894	2326	}
elessair	0:f269e3021894	2327	}
elessair	0:f269e3021894	2328	else
elessair	0:f269e3021894	2329	#endif /* MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */
elessair	0:f269e3021894	2330	{
elessair	0:f269e3021894	2331	MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
elessair	0:f269e3021894	2332	return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
elessair	0:f269e3021894	2333	}
elessair	0:f269e3021894	2334
elessair	0:f269e3021894	2335	#if defined(MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED) \|\| \
elessair	0:f269e3021894	2336	defined(MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED) \|\| \
elessair	0:f269e3021894	2337	defined(MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED)
elessair	0:f269e3021894	2338	if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_RSA \|\|
elessair	0:f269e3021894	2339	ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_RSA \|\|
elessair	0:f269e3021894	2340	ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA )
elessair	0:f269e3021894	2341	{
elessair	0:f269e3021894	2342	size_t sig_len, hashlen;
elessair	0:f269e3021894	2343	unsigned char hash[64];
elessair	0:f269e3021894	2344	mbedtls_md_type_t md_alg = MBEDTLS_MD_NONE;
elessair	0:f269e3021894	2345	mbedtls_pk_type_t pk_alg = MBEDTLS_PK_NONE;
elessair	0:f269e3021894	2346	unsigned char *params = ssl->in_msg + mbedtls_ssl_hs_hdr_len( ssl );
elessair	0:f269e3021894	2347	size_t params_len = p - params;
elessair	0:f269e3021894	2348
elessair	0:f269e3021894	2349	/*
elessair	0:f269e3021894	2350	* Handle the digitally-signed structure
elessair	0:f269e3021894	2351	*/
elessair	0:f269e3021894	2352	#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
elessair	0:f269e3021894	2353	if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 )
elessair	0:f269e3021894	2354	{
elessair	0:f269e3021894	2355	if( ssl_parse_signature_algorithm( ssl, &p, end,
elessair	0:f269e3021894	2356	&md_alg, &pk_alg ) != 0 )
elessair	0:f269e3021894	2357	{
elessair	0:f269e3021894	2358	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server key exchange message" ) );
elessair	0:f269e3021894	2359	return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
elessair	0:f269e3021894	2360	}
elessair	0:f269e3021894	2361
elessair	0:f269e3021894	2362	if( pk_alg != mbedtls_ssl_get_ciphersuite_sig_pk_alg( ciphersuite_info ) )
elessair	0:f269e3021894	2363	{
elessair	0:f269e3021894	2364	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server key exchange message" ) );
elessair	0:f269e3021894	2365	return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
elessair	0:f269e3021894	2366	}
elessair	0:f269e3021894	2367	}
elessair	0:f269e3021894	2368	else
elessair	0:f269e3021894	2369	#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
elessair	0:f269e3021894	2370	#if defined(MBEDTLS_SSL_PROTO_SSL3) \|\| defined(MBEDTLS_SSL_PROTO_TLS1) \|\| \
elessair	0:f269e3021894	2371	defined(MBEDTLS_SSL_PROTO_TLS1_1)
elessair	0:f269e3021894	2372	if( ssl->minor_ver < MBEDTLS_SSL_MINOR_VERSION_3 )
elessair	0:f269e3021894	2373	{
elessair	0:f269e3021894	2374	pk_alg = mbedtls_ssl_get_ciphersuite_sig_pk_alg( ciphersuite_info );
elessair	0:f269e3021894	2375
elessair	0:f269e3021894	2376	/* Default hash for ECDSA is SHA-1 */
elessair	0:f269e3021894	2377	if( pk_alg == MBEDTLS_PK_ECDSA && md_alg == MBEDTLS_MD_NONE )
elessair	0:f269e3021894	2378	md_alg = MBEDTLS_MD_SHA1;
elessair	0:f269e3021894	2379	}
elessair	0:f269e3021894	2380	else
elessair	0:f269e3021894	2381	#endif
elessair	0:f269e3021894	2382	{
elessair	0:f269e3021894	2383	MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
elessair	0:f269e3021894	2384	return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
elessair	0:f269e3021894	2385	}
elessair	0:f269e3021894	2386
elessair	0:f269e3021894	2387	/*
elessair	0:f269e3021894	2388	* Read signature
elessair	0:f269e3021894	2389	*/
elessair	0:f269e3021894	2390	sig_len = ( p[0] << 8 ) \| p[1];
elessair	0:f269e3021894	2391	p += 2;
elessair	0:f269e3021894	2392
elessair	0:f269e3021894	2393	if( end != p + sig_len )
elessair	0:f269e3021894	2394	{
elessair	0:f269e3021894	2395	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server key exchange message" ) );
elessair	0:f269e3021894	2396	return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
elessair	0:f269e3021894	2397	}
elessair	0:f269e3021894	2398
elessair	0:f269e3021894	2399	MBEDTLS_SSL_DEBUG_BUF( 3, "signature", p, sig_len );
elessair	0:f269e3021894	2400
elessair	0:f269e3021894	2401	/*
elessair	0:f269e3021894	2402	* Compute the hash that has been signed
elessair	0:f269e3021894	2403	*/
elessair	0:f269e3021894	2404	#if defined(MBEDTLS_SSL_PROTO_SSL3) \|\| defined(MBEDTLS_SSL_PROTO_TLS1) \|\| \
elessair	0:f269e3021894	2405	defined(MBEDTLS_SSL_PROTO_TLS1_1)
elessair	0:f269e3021894	2406	if( md_alg == MBEDTLS_MD_NONE )
elessair	0:f269e3021894	2407	{
elessair	0:f269e3021894	2408	mbedtls_md5_context mbedtls_md5;
elessair	0:f269e3021894	2409	mbedtls_sha1_context mbedtls_sha1;
elessair	0:f269e3021894	2410
elessair	0:f269e3021894	2411	mbedtls_md5_init( &mbedtls_md5 );
elessair	0:f269e3021894	2412	mbedtls_sha1_init( &mbedtls_sha1 );
elessair	0:f269e3021894	2413
elessair	0:f269e3021894	2414	hashlen = 36;
elessair	0:f269e3021894	2415
elessair	0:f269e3021894	2416	/*
elessair	0:f269e3021894	2417	* digitally-signed struct {
elessair	0:f269e3021894	2418	* opaque md5_hash[16];
elessair	0:f269e3021894	2419	* opaque sha_hash[20];
elessair	0:f269e3021894	2420	* };
elessair	0:f269e3021894	2421	*
elessair	0:f269e3021894	2422	* md5_hash
elessair	0:f269e3021894	2423	* MD5(ClientHello.random + ServerHello.random
elessair	0:f269e3021894	2424	* + ServerParams);
elessair	0:f269e3021894	2425	* sha_hash
elessair	0:f269e3021894	2426	* SHA(ClientHello.random + ServerHello.random
elessair	0:f269e3021894	2427	* + ServerParams);
elessair	0:f269e3021894	2428	*/
elessair	0:f269e3021894	2429	mbedtls_md5_starts( &mbedtls_md5 );
elessair	0:f269e3021894	2430	mbedtls_md5_update( &mbedtls_md5, ssl->handshake->randbytes, 64 );
elessair	0:f269e3021894	2431	mbedtls_md5_update( &mbedtls_md5, params, params_len );
elessair	0:f269e3021894	2432	mbedtls_md5_finish( &mbedtls_md5, hash );
elessair	0:f269e3021894	2433
elessair	0:f269e3021894	2434	mbedtls_sha1_starts( &mbedtls_sha1 );
elessair	0:f269e3021894	2435	mbedtls_sha1_update( &mbedtls_sha1, ssl->handshake->randbytes, 64 );
elessair	0:f269e3021894	2436	mbedtls_sha1_update( &mbedtls_sha1, params, params_len );
elessair	0:f269e3021894	2437	mbedtls_sha1_finish( &mbedtls_sha1, hash + 16 );
elessair	0:f269e3021894	2438
elessair	0:f269e3021894	2439	mbedtls_md5_free( &mbedtls_md5 );
elessair	0:f269e3021894	2440	mbedtls_sha1_free( &mbedtls_sha1 );
elessair	0:f269e3021894	2441	}
elessair	0:f269e3021894	2442	else
elessair	0:f269e3021894	2443	#endif /* MBEDTLS_SSL_PROTO_SSL3 \|\| MBEDTLS_SSL_PROTO_TLS1 \|\| \
elessair	0:f269e3021894	2444	MBEDTLS_SSL_PROTO_TLS1_1 */
elessair	0:f269e3021894	2445	#if defined(MBEDTLS_SSL_PROTO_TLS1) \|\| defined(MBEDTLS_SSL_PROTO_TLS1_1) \|\| \
elessair	0:f269e3021894	2446	defined(MBEDTLS_SSL_PROTO_TLS1_2)
elessair	0:f269e3021894	2447	if( md_alg != MBEDTLS_MD_NONE )
elessair	0:f269e3021894	2448	{
elessair	0:f269e3021894	2449	mbedtls_md_context_t ctx;
elessair	0:f269e3021894	2450
elessair	0:f269e3021894	2451	mbedtls_md_init( &ctx );
elessair	0:f269e3021894	2452
elessair	0:f269e3021894	2453	/* Info from md_alg will be used instead */
elessair	0:f269e3021894	2454	hashlen = 0;
elessair	0:f269e3021894	2455
elessair	0:f269e3021894	2456	/*
elessair	0:f269e3021894	2457	* digitally-signed struct {
elessair	0:f269e3021894	2458	* opaque client_random[32];
elessair	0:f269e3021894	2459	* opaque server_random[32];
elessair	0:f269e3021894	2460	* ServerDHParams params;
elessair	0:f269e3021894	2461	* };
elessair	0:f269e3021894	2462	*/
elessair	0:f269e3021894	2463	if( ( ret = mbedtls_md_setup( &ctx,
elessair	0:f269e3021894	2464	mbedtls_md_info_from_type( md_alg ), 0 ) ) != 0 )
elessair	0:f269e3021894	2465	{
elessair	0:f269e3021894	2466	MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_md_setup", ret );
elessair	0:f269e3021894	2467	return( ret );
elessair	0:f269e3021894	2468	}
elessair	0:f269e3021894	2469
elessair	0:f269e3021894	2470	mbedtls_md_starts( &ctx );
elessair	0:f269e3021894	2471	mbedtls_md_update( &ctx, ssl->handshake->randbytes, 64 );
elessair	0:f269e3021894	2472	mbedtls_md_update( &ctx, params, params_len );
elessair	0:f269e3021894	2473	mbedtls_md_finish( &ctx, hash );
elessair	0:f269e3021894	2474	mbedtls_md_free( &ctx );
elessair	0:f269e3021894	2475	}
elessair	0:f269e3021894	2476	else
elessair	0:f269e3021894	2477	#endif /* MBEDTLS_SSL_PROTO_TLS1 \|\| MBEDTLS_SSL_PROTO_TLS1_1 \|\| \
elessair	0:f269e3021894	2478	MBEDTLS_SSL_PROTO_TLS1_2 */
elessair	0:f269e3021894	2479	{
elessair	0:f269e3021894	2480	MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
elessair	0:f269e3021894	2481	return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
elessair	0:f269e3021894	2482	}
elessair	0:f269e3021894	2483
elessair	0:f269e3021894	2484	MBEDTLS_SSL_DEBUG_BUF( 3, "parameters hash", hash, hashlen != 0 ? hashlen :
elessair	0:f269e3021894	2485	(unsigned int) ( mbedtls_md_get_size( mbedtls_md_info_from_type( md_alg ) ) ) );
elessair	0:f269e3021894	2486
elessair	0:f269e3021894	2487	if( ssl->session_negotiate->peer_cert == NULL )
elessair	0:f269e3021894	2488	{
elessair	0:f269e3021894	2489	MBEDTLS_SSL_DEBUG_MSG( 2, ( "certificate required" ) );
elessair	0:f269e3021894	2490	return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE );
elessair	0:f269e3021894	2491	}
elessair	0:f269e3021894	2492
elessair	0:f269e3021894	2493	/*
elessair	0:f269e3021894	2494	* Verify signature
elessair	0:f269e3021894	2495	*/
elessair	0:f269e3021894	2496	if( ! mbedtls_pk_can_do( &ssl->session_negotiate->peer_cert->pk, pk_alg ) )
elessair	0:f269e3021894	2497	{
elessair	0:f269e3021894	2498	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server key exchange message" ) );
elessair	0:f269e3021894	2499	return( MBEDTLS_ERR_SSL_PK_TYPE_MISMATCH );
elessair	0:f269e3021894	2500	}
elessair	0:f269e3021894	2501
elessair	0:f269e3021894	2502	if( ( ret = mbedtls_pk_verify( &ssl->session_negotiate->peer_cert->pk,
elessair	0:f269e3021894	2503	md_alg, hash, hashlen, p, sig_len ) ) != 0 )
elessair	0:f269e3021894	2504	{
elessair	0:f269e3021894	2505	MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_pk_verify", ret );
elessair	0:f269e3021894	2506	return( ret );
elessair	0:f269e3021894	2507	}
elessair	0:f269e3021894	2508	}
elessair	0:f269e3021894	2509	#endif /* MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED \|\|
elessair	0:f269e3021894	2510	MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED \|\|
elessair	0:f269e3021894	2511	MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED */
elessair	0:f269e3021894	2512
elessair	0:f269e3021894	2513	exit:
elessair	0:f269e3021894	2514	ssl->state++;
elessair	0:f269e3021894	2515
elessair	0:f269e3021894	2516	MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse server key exchange" ) );
elessair	0:f269e3021894	2517
elessair	0:f269e3021894	2518	return( 0 );
elessair	0:f269e3021894	2519	}
elessair	0:f269e3021894	2520
elessair	0:f269e3021894	2521	#if !defined(MBEDTLS_KEY_EXCHANGE_RSA_ENABLED) && \
elessair	0:f269e3021894	2522	!defined(MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED) && \
elessair	0:f269e3021894	2523	!defined(MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED) && \
elessair	0:f269e3021894	2524	!defined(MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED) && \
elessair	0:f269e3021894	2525	!defined(MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED)&& \
elessair	0:f269e3021894	2526	!defined(MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED)
elessair	0:f269e3021894	2527	static int ssl_parse_certificate_request( mbedtls_ssl_context *ssl )
elessair	0:f269e3021894	2528	{
elessair	0:f269e3021894	2529	const mbedtls_ssl_ciphersuite_t *ciphersuite_info = ssl->transform_negotiate->ciphersuite_info;
elessair	0:f269e3021894	2530
elessair	0:f269e3021894	2531	MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse certificate request" ) );
elessair	0:f269e3021894	2532
elessair	0:f269e3021894	2533	if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_PSK \|\|
elessair	0:f269e3021894	2534	ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA_PSK \|\|
elessair	0:f269e3021894	2535	ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_PSK \|\|
elessair	0:f269e3021894	2536	ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_PSK \|\|
elessair	0:f269e3021894	2537	ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECJPAKE )
elessair	0:f269e3021894	2538	{
elessair	0:f269e3021894	2539	MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip parse certificate request" ) );
elessair	0:f269e3021894	2540	ssl->state++;
elessair	0:f269e3021894	2541	return( 0 );
elessair	0:f269e3021894	2542	}
elessair	0:f269e3021894	2543
elessair	0:f269e3021894	2544	MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
elessair	0:f269e3021894	2545	return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
elessair	0:f269e3021894	2546	}
elessair	0:f269e3021894	2547	#else
elessair	0:f269e3021894	2548	static int ssl_parse_certificate_request( mbedtls_ssl_context *ssl )
elessair	0:f269e3021894	2549	{
elessair	0:f269e3021894	2550	int ret;
elessair	0:f269e3021894	2551	unsigned char *buf;
elessair	0:f269e3021894	2552	size_t n = 0;
elessair	0:f269e3021894	2553	size_t cert_type_len = 0, dn_len = 0;
elessair	0:f269e3021894	2554	const mbedtls_ssl_ciphersuite_t *ciphersuite_info = ssl->transform_negotiate->ciphersuite_info;
elessair	0:f269e3021894	2555
elessair	0:f269e3021894	2556	MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse certificate request" ) );
elessair	0:f269e3021894	2557
elessair	0:f269e3021894	2558	if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_PSK \|\|
elessair	0:f269e3021894	2559	ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA_PSK \|\|
elessair	0:f269e3021894	2560	ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_PSK \|\|
elessair	0:f269e3021894	2561	ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_PSK \|\|
elessair	0:f269e3021894	2562	ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECJPAKE )
elessair	0:f269e3021894	2563	{
elessair	0:f269e3021894	2564	MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip parse certificate request" ) );
elessair	0:f269e3021894	2565	ssl->state++;
elessair	0:f269e3021894	2566	return( 0 );
elessair	0:f269e3021894	2567	}
elessair	0:f269e3021894	2568
elessair	0:f269e3021894	2569	if( ssl->record_read == 0 )
elessair	0:f269e3021894	2570	{
elessair	0:f269e3021894	2571	if( ( ret = mbedtls_ssl_read_record( ssl ) ) != 0 )
elessair	0:f269e3021894	2572	{
elessair	0:f269e3021894	2573	MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_read_record", ret );
elessair	0:f269e3021894	2574	return( ret );
elessair	0:f269e3021894	2575	}
elessair	0:f269e3021894	2576
elessair	0:f269e3021894	2577	if( ssl->in_msgtype != MBEDTLS_SSL_MSG_HANDSHAKE )
elessair	0:f269e3021894	2578	{
elessair	0:f269e3021894	2579	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate request message" ) );
elessair	0:f269e3021894	2580	return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE );
elessair	0:f269e3021894	2581	}
elessair	0:f269e3021894	2582
elessair	0:f269e3021894	2583	ssl->record_read = 1;
elessair	0:f269e3021894	2584	}
elessair	0:f269e3021894	2585
elessair	0:f269e3021894	2586	ssl->client_auth = 0;
elessair	0:f269e3021894	2587	ssl->state++;
elessair	0:f269e3021894	2588
elessair	0:f269e3021894	2589	if( ssl->in_msg[0] == MBEDTLS_SSL_HS_CERTIFICATE_REQUEST )
elessair	0:f269e3021894	2590	ssl->client_auth++;
elessair	0:f269e3021894	2591
elessair	0:f269e3021894	2592	MBEDTLS_SSL_DEBUG_MSG( 3, ( "got %s certificate request",
elessair	0:f269e3021894	2593	ssl->client_auth ? "a" : "no" ) );
elessair	0:f269e3021894	2594
elessair	0:f269e3021894	2595	if( ssl->client_auth == 0 )
elessair	0:f269e3021894	2596	goto exit;
elessair	0:f269e3021894	2597
elessair	0:f269e3021894	2598	ssl->record_read = 0;
elessair	0:f269e3021894	2599
elessair	0:f269e3021894	2600	/*
elessair	0:f269e3021894	2601	* struct {
elessair	0:f269e3021894	2602	* ClientCertificateType certificate_types<1..2^8-1>;
elessair	0:f269e3021894	2603	* SignatureAndHashAlgorithm
elessair	0:f269e3021894	2604	* supported_signature_algorithms<2^16-1>; -- TLS 1.2 only
elessair	0:f269e3021894	2605	* DistinguishedName certificate_authorities<0..2^16-1>;
elessair	0:f269e3021894	2606	* } CertificateRequest;
elessair	0:f269e3021894	2607	*
elessair	0:f269e3021894	2608	* Since we only support a single certificate on clients, let's just
elessair	0:f269e3021894	2609	* ignore all the information that's supposed to help us pick a
elessair	0:f269e3021894	2610	* certificate.
elessair	0:f269e3021894	2611	*
elessair	0:f269e3021894	2612	* We could check that our certificate matches the request, and bail out
elessair	0:f269e3021894	2613	* if it doesn't, but it's simpler to just send the certificate anyway,
elessair	0:f269e3021894	2614	* and give the server the opportunity to decide if it should terminate
elessair	0:f269e3021894	2615	* the connection when it doesn't like our certificate.
elessair	0:f269e3021894	2616	*
elessair	0:f269e3021894	2617	* Same goes for the hash in TLS 1.2's signature_algorithms: at this
elessair	0:f269e3021894	2618	* point we only have one hash available (see comments in
elessair	0:f269e3021894	2619	* write_certificate_verify), so let's just use what we have.
elessair	0:f269e3021894	2620	*
elessair	0:f269e3021894	2621	* However, we still minimally parse the message to check it is at least
elessair	0:f269e3021894	2622	* superficially sane.
elessair	0:f269e3021894	2623	*/
elessair	0:f269e3021894	2624	buf = ssl->in_msg;
elessair	0:f269e3021894	2625
elessair	0:f269e3021894	2626	/* certificate_types */
elessair	0:f269e3021894	2627	cert_type_len = buf[mbedtls_ssl_hs_hdr_len( ssl )];
elessair	0:f269e3021894	2628	n = cert_type_len;
elessair	0:f269e3021894	2629
elessair	0:f269e3021894	2630	if( ssl->in_hslen < mbedtls_ssl_hs_hdr_len( ssl ) + 2 + n )
elessair	0:f269e3021894	2631	{
elessair	0:f269e3021894	2632	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate request message" ) );
elessair	0:f269e3021894	2633	return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE_REQUEST );
elessair	0:f269e3021894	2634	}
elessair	0:f269e3021894	2635
elessair	0:f269e3021894	2636	/* supported_signature_algorithms */
elessair	0:f269e3021894	2637	#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
elessair	0:f269e3021894	2638	if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 )
elessair	0:f269e3021894	2639	{
elessair	0:f269e3021894	2640	size_t sig_alg_len = ( ( buf[mbedtls_ssl_hs_hdr_len( ssl ) + 1 + n] << 8 )
elessair	0:f269e3021894	2641	\| ( buf[mbedtls_ssl_hs_hdr_len( ssl ) + 2 + n] ) );
elessair	0:f269e3021894	2642	#if defined(MBEDTLS_DEBUG_C)
elessair	0:f269e3021894	2643	unsigned char* sig_alg = buf + mbedtls_ssl_hs_hdr_len( ssl ) + 3 + n;
elessair	0:f269e3021894	2644	size_t i;
elessair	0:f269e3021894	2645
elessair	0:f269e3021894	2646	for( i = 0; i < sig_alg_len; i += 2 )
elessair	0:f269e3021894	2647	{
elessair	0:f269e3021894	2648	MBEDTLS_SSL_DEBUG_MSG( 3, ( "Supported Signature Algorithm found: %d,%d", sig_alg[i], sig_alg[i + 1] ) );
elessair	0:f269e3021894	2649	}
elessair	0:f269e3021894	2650	#endif
elessair	0:f269e3021894	2651
elessair	0:f269e3021894	2652	n += 2 + sig_alg_len;
elessair	0:f269e3021894	2653
elessair	0:f269e3021894	2654	if( ssl->in_hslen < mbedtls_ssl_hs_hdr_len( ssl ) + 2 + n )
elessair	0:f269e3021894	2655	{
elessair	0:f269e3021894	2656	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate request message" ) );
elessair	0:f269e3021894	2657	return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE_REQUEST );
elessair	0:f269e3021894	2658	}
elessair	0:f269e3021894	2659	}
elessair	0:f269e3021894	2660	#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
elessair	0:f269e3021894	2661
elessair	0:f269e3021894	2662	/* certificate_authorities */
elessair	0:f269e3021894	2663	dn_len = ( ( buf[mbedtls_ssl_hs_hdr_len( ssl ) + 1 + n] << 8 )
elessair	0:f269e3021894	2664	\| ( buf[mbedtls_ssl_hs_hdr_len( ssl ) + 2 + n] ) );
elessair	0:f269e3021894	2665
elessair	0:f269e3021894	2666	n += dn_len;
elessair	0:f269e3021894	2667	if( ssl->in_hslen != mbedtls_ssl_hs_hdr_len( ssl ) + 3 + n )
elessair	0:f269e3021894	2668	{
elessair	0:f269e3021894	2669	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate request message" ) );
elessair	0:f269e3021894	2670	return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE_REQUEST );
elessair	0:f269e3021894	2671	}
elessair	0:f269e3021894	2672
elessair	0:f269e3021894	2673	exit:
elessair	0:f269e3021894	2674	MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse certificate request" ) );
elessair	0:f269e3021894	2675
elessair	0:f269e3021894	2676	return( 0 );
elessair	0:f269e3021894	2677	}
elessair	0:f269e3021894	2678	#endif /* !MBEDTLS_KEY_EXCHANGE_RSA_ENABLED &&
elessair	0:f269e3021894	2679	!MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED &&
elessair	0:f269e3021894	2680	!MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED &&
elessair	0:f269e3021894	2681	!MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED &&
elessair	0:f269e3021894	2682	!MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED &&
elessair	0:f269e3021894	2683	!MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED */
elessair	0:f269e3021894	2684
elessair	0:f269e3021894	2685	static int ssl_parse_server_hello_done( mbedtls_ssl_context *ssl )
elessair	0:f269e3021894	2686	{
elessair	0:f269e3021894	2687	int ret;
elessair	0:f269e3021894	2688
elessair	0:f269e3021894	2689	MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse server hello done" ) );
elessair	0:f269e3021894	2690
elessair	0:f269e3021894	2691	if( ssl->record_read == 0 )
elessair	0:f269e3021894	2692	{
elessair	0:f269e3021894	2693	if( ( ret = mbedtls_ssl_read_record( ssl ) ) != 0 )
elessair	0:f269e3021894	2694	{
elessair	0:f269e3021894	2695	MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_read_record", ret );
elessair	0:f269e3021894	2696	return( ret );
elessair	0:f269e3021894	2697	}
elessair	0:f269e3021894	2698
elessair	0:f269e3021894	2699	if( ssl->in_msgtype != MBEDTLS_SSL_MSG_HANDSHAKE )
elessair	0:f269e3021894	2700	{
elessair	0:f269e3021894	2701	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server hello done message" ) );
elessair	0:f269e3021894	2702	return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE );
elessair	0:f269e3021894	2703	}
elessair	0:f269e3021894	2704	}
elessair	0:f269e3021894	2705	ssl->record_read = 0;
elessair	0:f269e3021894	2706
elessair	0:f269e3021894	2707	if( ssl->in_hslen != mbedtls_ssl_hs_hdr_len( ssl ) \|\|
elessair	0:f269e3021894	2708	ssl->in_msg[0] != MBEDTLS_SSL_HS_SERVER_HELLO_DONE )
elessair	0:f269e3021894	2709	{
elessair	0:f269e3021894	2710	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server hello done message" ) );
elessair	0:f269e3021894	2711	return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO_DONE );
elessair	0:f269e3021894	2712	}
elessair	0:f269e3021894	2713
elessair	0:f269e3021894	2714	ssl->state++;
elessair	0:f269e3021894	2715
elessair	0:f269e3021894	2716	#if defined(MBEDTLS_SSL_PROTO_DTLS)
elessair	0:f269e3021894	2717	if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
elessair	0:f269e3021894	2718	mbedtls_ssl_recv_flight_completed( ssl );
elessair	0:f269e3021894	2719	#endif
elessair	0:f269e3021894	2720
elessair	0:f269e3021894	2721	MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse server hello done" ) );
elessair	0:f269e3021894	2722
elessair	0:f269e3021894	2723	return( 0 );
elessair	0:f269e3021894	2724	}
elessair	0:f269e3021894	2725
elessair	0:f269e3021894	2726	static int ssl_write_client_key_exchange( mbedtls_ssl_context *ssl )
elessair	0:f269e3021894	2727	{
elessair	0:f269e3021894	2728	int ret;
elessair	0:f269e3021894	2729	size_t i, n;
elessair	0:f269e3021894	2730	const mbedtls_ssl_ciphersuite_t *ciphersuite_info = ssl->transform_negotiate->ciphersuite_info;
elessair	0:f269e3021894	2731
elessair	0:f269e3021894	2732	MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write client key exchange" ) );
elessair	0:f269e3021894	2733
elessair	0:f269e3021894	2734	#if defined(MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED)
elessair	0:f269e3021894	2735	if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_RSA )
elessair	0:f269e3021894	2736	{
elessair	0:f269e3021894	2737	/*
elessair	0:f269e3021894	2738	* DHM key exchange -- send G^X mod P
elessair	0:f269e3021894	2739	*/
elessair	0:f269e3021894	2740	n = ssl->handshake->dhm_ctx.len;
elessair	0:f269e3021894	2741
elessair	0:f269e3021894	2742	ssl->out_msg[4] = (unsigned char)( n >> 8 );
elessair	0:f269e3021894	2743	ssl->out_msg[5] = (unsigned char)( n );
elessair	0:f269e3021894	2744	i = 6;
elessair	0:f269e3021894	2745
elessair	0:f269e3021894	2746	ret = mbedtls_dhm_make_public( &ssl->handshake->dhm_ctx,
elessair	0:f269e3021894	2747	(int) mbedtls_mpi_size( &ssl->handshake->dhm_ctx.P ),
elessair	0:f269e3021894	2748	&ssl->out_msg[i], n,
elessair	0:f269e3021894	2749	ssl->conf->f_rng, ssl->conf->p_rng );
elessair	0:f269e3021894	2750	if( ret != 0 )
elessair	0:f269e3021894	2751	{
elessair	0:f269e3021894	2752	MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_dhm_make_public", ret );
elessair	0:f269e3021894	2753	return( ret );
elessair	0:f269e3021894	2754	}
elessair	0:f269e3021894	2755
elessair	0:f269e3021894	2756	MBEDTLS_SSL_DEBUG_MPI( 3, "DHM: X ", &ssl->handshake->dhm_ctx.X );
elessair	0:f269e3021894	2757	MBEDTLS_SSL_DEBUG_MPI( 3, "DHM: GX", &ssl->handshake->dhm_ctx.GX );
elessair	0:f269e3021894	2758
elessair	0:f269e3021894	2759	if( ( ret = mbedtls_dhm_calc_secret( &ssl->handshake->dhm_ctx,
elessair	0:f269e3021894	2760	ssl->handshake->premaster,
elessair	0:f269e3021894	2761	MBEDTLS_PREMASTER_SIZE,
elessair	0:f269e3021894	2762	&ssl->handshake->pmslen,
elessair	0:f269e3021894	2763	ssl->conf->f_rng, ssl->conf->p_rng ) ) != 0 )
elessair	0:f269e3021894	2764	{
elessair	0:f269e3021894	2765	MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_dhm_calc_secret", ret );
elessair	0:f269e3021894	2766	return( ret );
elessair	0:f269e3021894	2767	}
elessair	0:f269e3021894	2768
elessair	0:f269e3021894	2769	MBEDTLS_SSL_DEBUG_MPI( 3, "DHM: K ", &ssl->handshake->dhm_ctx.K );
elessair	0:f269e3021894	2770	}
elessair	0:f269e3021894	2771	else
elessair	0:f269e3021894	2772	#endif /* MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED */
elessair	0:f269e3021894	2773	#if defined(MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED) \|\| \
elessair	0:f269e3021894	2774	defined(MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED) \|\| \
elessair	0:f269e3021894	2775	defined(MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED) \|\| \
elessair	0:f269e3021894	2776	defined(MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED)
elessair	0:f269e3021894	2777	if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_RSA \|\|
elessair	0:f269e3021894	2778	ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA \|\|
elessair	0:f269e3021894	2779	ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDH_RSA \|\|
elessair	0:f269e3021894	2780	ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA )
elessair	0:f269e3021894	2781	{
elessair	0:f269e3021894	2782	/*
elessair	0:f269e3021894	2783	* ECDH key exchange -- send client public value
elessair	0:f269e3021894	2784	*/
elessair	0:f269e3021894	2785	i = 4;
elessair	0:f269e3021894	2786
elessair	0:f269e3021894	2787	ret = mbedtls_ecdh_make_public( &ssl->handshake->ecdh_ctx,
elessair	0:f269e3021894	2788	&n,
elessair	0:f269e3021894	2789	&ssl->out_msg[i], 1000,
elessair	0:f269e3021894	2790	ssl->conf->f_rng, ssl->conf->p_rng );
elessair	0:f269e3021894	2791	if( ret != 0 )
elessair	0:f269e3021894	2792	{
elessair	0:f269e3021894	2793	MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecdh_make_public", ret );
elessair	0:f269e3021894	2794	return( ret );
elessair	0:f269e3021894	2795	}
elessair	0:f269e3021894	2796
elessair	0:f269e3021894	2797	MBEDTLS_SSL_DEBUG_ECP( 3, "ECDH: Q", &ssl->handshake->ecdh_ctx.Q );
elessair	0:f269e3021894	2798
elessair	0:f269e3021894	2799	if( ( ret = mbedtls_ecdh_calc_secret( &ssl->handshake->ecdh_ctx,
elessair	0:f269e3021894	2800	&ssl->handshake->pmslen,
elessair	0:f269e3021894	2801	ssl->handshake->premaster,
elessair	0:f269e3021894	2802	MBEDTLS_MPI_MAX_SIZE,
elessair	0:f269e3021894	2803	ssl->conf->f_rng, ssl->conf->p_rng ) ) != 0 )
elessair	0:f269e3021894	2804	{
elessair	0:f269e3021894	2805	MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecdh_calc_secret", ret );
elessair	0:f269e3021894	2806	return( ret );
elessair	0:f269e3021894	2807	}
elessair	0:f269e3021894	2808
elessair	0:f269e3021894	2809	MBEDTLS_SSL_DEBUG_MPI( 3, "ECDH: z", &ssl->handshake->ecdh_ctx.z );
elessair	0:f269e3021894	2810	}
elessair	0:f269e3021894	2811	else
elessair	0:f269e3021894	2812	#endif /* MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED \|\|
elessair	0:f269e3021894	2813	MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED \|\|
elessair	0:f269e3021894	2814	MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED \|\|
elessair	0:f269e3021894	2815	MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED */
elessair	0:f269e3021894	2816	#if defined(MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED)
elessair	0:f269e3021894	2817	if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_PSK \|\|
elessair	0:f269e3021894	2818	ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA_PSK \|\|
elessair	0:f269e3021894	2819	ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_PSK \|\|
elessair	0:f269e3021894	2820	ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_PSK )
elessair	0:f269e3021894	2821	{
elessair	0:f269e3021894	2822	/*
elessair	0:f269e3021894	2823	* opaque psk_identity<0..2^16-1>;
elessair	0:f269e3021894	2824	*/
elessair	0:f269e3021894	2825	if( ssl->conf->psk == NULL \|\| ssl->conf->psk_identity == NULL )
elessair	0:f269e3021894	2826	{
elessair	0:f269e3021894	2827	MBEDTLS_SSL_DEBUG_MSG( 1, ( "got no private key for PSK" ) );
elessair	0:f269e3021894	2828	return( MBEDTLS_ERR_SSL_PRIVATE_KEY_REQUIRED );
elessair	0:f269e3021894	2829	}
elessair	0:f269e3021894	2830
elessair	0:f269e3021894	2831	i = 4;
elessair	0:f269e3021894	2832	n = ssl->conf->psk_identity_len;
elessair	0:f269e3021894	2833
elessair	0:f269e3021894	2834	if( i + 2 + n > MBEDTLS_SSL_MAX_CONTENT_LEN )
elessair	0:f269e3021894	2835	{
elessair	0:f269e3021894	2836	MBEDTLS_SSL_DEBUG_MSG( 1, ( "psk identity too long or "
elessair	0:f269e3021894	2837	"SSL buffer too short" ) );
elessair	0:f269e3021894	2838	return( MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL );
elessair	0:f269e3021894	2839	}
elessair	0:f269e3021894	2840
elessair	0:f269e3021894	2841	ssl->out_msg[i++] = (unsigned char)( n >> 8 );
elessair	0:f269e3021894	2842	ssl->out_msg[i++] = (unsigned char)( n );
elessair	0:f269e3021894	2843
elessair	0:f269e3021894	2844	memcpy( ssl->out_msg + i, ssl->conf->psk_identity, ssl->conf->psk_identity_len );
elessair	0:f269e3021894	2845	i += ssl->conf->psk_identity_len;
elessair	0:f269e3021894	2846
elessair	0:f269e3021894	2847	#if defined(MBEDTLS_KEY_EXCHANGE_PSK_ENABLED)
elessair	0:f269e3021894	2848	if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_PSK )
elessair	0:f269e3021894	2849	{
elessair	0:f269e3021894	2850	n = 0;
elessair	0:f269e3021894	2851	}
elessair	0:f269e3021894	2852	else
elessair	0:f269e3021894	2853	#endif
elessair	0:f269e3021894	2854	#if defined(MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED)
elessair	0:f269e3021894	2855	if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA_PSK )
elessair	0:f269e3021894	2856	{
elessair	0:f269e3021894	2857	if( ( ret = ssl_write_encrypted_pms( ssl, i, &n, 2 ) ) != 0 )
elessair	0:f269e3021894	2858	return( ret );
elessair	0:f269e3021894	2859	}
elessair	0:f269e3021894	2860	else
elessair	0:f269e3021894	2861	#endif
elessair	0:f269e3021894	2862	#if defined(MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED)
elessair	0:f269e3021894	2863	if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_PSK )
elessair	0:f269e3021894	2864	{
elessair	0:f269e3021894	2865	/*
elessair	0:f269e3021894	2866	* ClientDiffieHellmanPublic public (DHM send G^X mod P)
elessair	0:f269e3021894	2867	*/
elessair	0:f269e3021894	2868	n = ssl->handshake->dhm_ctx.len;
elessair	0:f269e3021894	2869
elessair	0:f269e3021894	2870	if( i + 2 + n > MBEDTLS_SSL_MAX_CONTENT_LEN )
elessair	0:f269e3021894	2871	{
elessair	0:f269e3021894	2872	MBEDTLS_SSL_DEBUG_MSG( 1, ( "psk identity or DHM size too long"
elessair	0:f269e3021894	2873	" or SSL buffer too short" ) );
elessair	0:f269e3021894	2874	return( MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL );
elessair	0:f269e3021894	2875	}
elessair	0:f269e3021894	2876
elessair	0:f269e3021894	2877	ssl->out_msg[i++] = (unsigned char)( n >> 8 );
elessair	0:f269e3021894	2878	ssl->out_msg[i++] = (unsigned char)( n );
elessair	0:f269e3021894	2879
elessair	0:f269e3021894	2880	ret = mbedtls_dhm_make_public( &ssl->handshake->dhm_ctx,
elessair	0:f269e3021894	2881	(int) mbedtls_mpi_size( &ssl->handshake->dhm_ctx.P ),
elessair	0:f269e3021894	2882	&ssl->out_msg[i], n,
elessair	0:f269e3021894	2883	ssl->conf->f_rng, ssl->conf->p_rng );
elessair	0:f269e3021894	2884	if( ret != 0 )
elessair	0:f269e3021894	2885	{
elessair	0:f269e3021894	2886	MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_dhm_make_public", ret );
elessair	0:f269e3021894	2887	return( ret );
elessair	0:f269e3021894	2888	}
elessair	0:f269e3021894	2889	}
elessair	0:f269e3021894	2890	else
elessair	0:f269e3021894	2891	#endif /* MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED */
elessair	0:f269e3021894	2892	#if defined(MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED)
elessair	0:f269e3021894	2893	if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_PSK )
elessair	0:f269e3021894	2894	{
elessair	0:f269e3021894	2895	/*
elessair	0:f269e3021894	2896	* ClientECDiffieHellmanPublic public;
elessair	0:f269e3021894	2897	*/
elessair	0:f269e3021894	2898	ret = mbedtls_ecdh_make_public( &ssl->handshake->ecdh_ctx, &n,
elessair	0:f269e3021894	2899	&ssl->out_msg[i], MBEDTLS_SSL_MAX_CONTENT_LEN - i,
elessair	0:f269e3021894	2900	ssl->conf->f_rng, ssl->conf->p_rng );
elessair	0:f269e3021894	2901	if( ret != 0 )
elessair	0:f269e3021894	2902	{
elessair	0:f269e3021894	2903	MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecdh_make_public", ret );
elessair	0:f269e3021894	2904	return( ret );
elessair	0:f269e3021894	2905	}
elessair	0:f269e3021894	2906
elessair	0:f269e3021894	2907	MBEDTLS_SSL_DEBUG_ECP( 3, "ECDH: Q", &ssl->handshake->ecdh_ctx.Q );
elessair	0:f269e3021894	2908	}
elessair	0:f269e3021894	2909	else
elessair	0:f269e3021894	2910	#endif /* MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED */
elessair	0:f269e3021894	2911	{
elessair	0:f269e3021894	2912	MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
elessair	0:f269e3021894	2913	return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
elessair	0:f269e3021894	2914	}
elessair	0:f269e3021894	2915
elessair	0:f269e3021894	2916	if( ( ret = mbedtls_ssl_psk_derive_premaster( ssl,
elessair	0:f269e3021894	2917	ciphersuite_info->key_exchange ) ) != 0 )
elessair	0:f269e3021894	2918	{
elessair	0:f269e3021894	2919	MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_psk_derive_premaster", ret );
elessair	0:f269e3021894	2920	return( ret );
elessair	0:f269e3021894	2921	}
elessair	0:f269e3021894	2922	}
elessair	0:f269e3021894	2923	else
elessair	0:f269e3021894	2924	#endif /* MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED */
elessair	0:f269e3021894	2925	#if defined(MBEDTLS_KEY_EXCHANGE_RSA_ENABLED)
elessair	0:f269e3021894	2926	if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA )
elessair	0:f269e3021894	2927	{
elessair	0:f269e3021894	2928	i = 4;
elessair	0:f269e3021894	2929	if( ( ret = ssl_write_encrypted_pms( ssl, i, &n, 0 ) ) != 0 )
elessair	0:f269e3021894	2930	return( ret );
elessair	0:f269e3021894	2931	}
elessair	0:f269e3021894	2932	else
elessair	0:f269e3021894	2933	#endif /* MBEDTLS_KEY_EXCHANGE_RSA_ENABLED */
elessair	0:f269e3021894	2934	#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
elessair	0:f269e3021894	2935	if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECJPAKE )
elessair	0:f269e3021894	2936	{
elessair	0:f269e3021894	2937	i = 4;
elessair	0:f269e3021894	2938
elessair	0:f269e3021894	2939	ret = mbedtls_ecjpake_write_round_two( &ssl->handshake->ecjpake_ctx,
elessair	0:f269e3021894	2940	ssl->out_msg + i, MBEDTLS_SSL_MAX_CONTENT_LEN - i, &n,
elessair	0:f269e3021894	2941	ssl->conf->f_rng, ssl->conf->p_rng );
elessair	0:f269e3021894	2942	if( ret != 0 )
elessair	0:f269e3021894	2943	{
elessair	0:f269e3021894	2944	MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecjpake_write_round_two", ret );
elessair	0:f269e3021894	2945	return( ret );
elessair	0:f269e3021894	2946	}
elessair	0:f269e3021894	2947
elessair	0:f269e3021894	2948	ret = mbedtls_ecjpake_derive_secret( &ssl->handshake->ecjpake_ctx,
elessair	0:f269e3021894	2949	ssl->handshake->premaster, 32, &ssl->handshake->pmslen,
elessair	0:f269e3021894	2950	ssl->conf->f_rng, ssl->conf->p_rng );
elessair	0:f269e3021894	2951	if( ret != 0 )
elessair	0:f269e3021894	2952	{
elessair	0:f269e3021894	2953	MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecjpake_derive_secret", ret );
elessair	0:f269e3021894	2954	return( ret );
elessair	0:f269e3021894	2955	}
elessair	0:f269e3021894	2956	}
elessair	0:f269e3021894	2957	else
elessair	0:f269e3021894	2958	#endif /* MBEDTLS_KEY_EXCHANGE_RSA_ENABLED */
elessair	0:f269e3021894	2959	{
elessair	0:f269e3021894	2960	((void) ciphersuite_info);
elessair	0:f269e3021894	2961	MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
elessair	0:f269e3021894	2962	return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
elessair	0:f269e3021894	2963	}
elessair	0:f269e3021894	2964
elessair	0:f269e3021894	2965	ssl->out_msglen = i + n;
elessair	0:f269e3021894	2966	ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE;
elessair	0:f269e3021894	2967	ssl->out_msg[0] = MBEDTLS_SSL_HS_CLIENT_KEY_EXCHANGE;
elessair	0:f269e3021894	2968
elessair	0:f269e3021894	2969	ssl->state++;
elessair	0:f269e3021894	2970
elessair	0:f269e3021894	2971	if( ( ret = mbedtls_ssl_write_record( ssl ) ) != 0 )
elessair	0:f269e3021894	2972	{
elessair	0:f269e3021894	2973	MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_record", ret );
elessair	0:f269e3021894	2974	return( ret );
elessair	0:f269e3021894	2975	}
elessair	0:f269e3021894	2976
elessair	0:f269e3021894	2977	MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write client key exchange" ) );
elessair	0:f269e3021894	2978
elessair	0:f269e3021894	2979	return( 0 );
elessair	0:f269e3021894	2980	}
elessair	0:f269e3021894	2981
elessair	0:f269e3021894	2982	#if !defined(MBEDTLS_KEY_EXCHANGE_RSA_ENABLED) && \
elessair	0:f269e3021894	2983	!defined(MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED) && \
elessair	0:f269e3021894	2984	!defined(MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED) && \
elessair	0:f269e3021894	2985	!defined(MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED) && \
elessair	0:f269e3021894	2986	!defined(MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED)&& \
elessair	0:f269e3021894	2987	!defined(MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED)
elessair	0:f269e3021894	2988	static int ssl_write_certificate_verify( mbedtls_ssl_context *ssl )
elessair	0:f269e3021894	2989	{
elessair	0:f269e3021894	2990	const mbedtls_ssl_ciphersuite_t *ciphersuite_info = ssl->transform_negotiate->ciphersuite_info;
elessair	0:f269e3021894	2991	int ret;
elessair	0:f269e3021894	2992
elessair	0:f269e3021894	2993	MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write certificate verify" ) );
elessair	0:f269e3021894	2994
elessair	0:f269e3021894	2995	if( ( ret = mbedtls_ssl_derive_keys( ssl ) ) != 0 )
elessair	0:f269e3021894	2996	{
elessair	0:f269e3021894	2997	MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_derive_keys", ret );
elessair	0:f269e3021894	2998	return( ret );
elessair	0:f269e3021894	2999	}
elessair	0:f269e3021894	3000
elessair	0:f269e3021894	3001	if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_PSK \|\|
elessair	0:f269e3021894	3002	ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA_PSK \|\|
elessair	0:f269e3021894	3003	ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_PSK \|\|
elessair	0:f269e3021894	3004	ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_PSK \|\|
elessair	0:f269e3021894	3005	ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECJPAKE )
elessair	0:f269e3021894	3006	{
elessair	0:f269e3021894	3007	MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip write certificate verify" ) );
elessair	0:f269e3021894	3008	ssl->state++;
elessair	0:f269e3021894	3009	return( 0 );
elessair	0:f269e3021894	3010	}
elessair	0:f269e3021894	3011
elessair	0:f269e3021894	3012	MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
elessair	0:f269e3021894	3013	return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
elessair	0:f269e3021894	3014	}
elessair	0:f269e3021894	3015	#else
elessair	0:f269e3021894	3016	static int ssl_write_certificate_verify( mbedtls_ssl_context *ssl )
elessair	0:f269e3021894	3017	{
elessair	0:f269e3021894	3018	int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE;
elessair	0:f269e3021894	3019	const mbedtls_ssl_ciphersuite_t *ciphersuite_info = ssl->transform_negotiate->ciphersuite_info;
elessair	0:f269e3021894	3020	size_t n = 0, offset = 0;
elessair	0:f269e3021894	3021	unsigned char hash[48];
elessair	0:f269e3021894	3022	unsigned char *hash_start = hash;
elessair	0:f269e3021894	3023	mbedtls_md_type_t md_alg = MBEDTLS_MD_NONE;
elessair	0:f269e3021894	3024	unsigned int hashlen;
elessair	0:f269e3021894	3025
elessair	0:f269e3021894	3026	MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write certificate verify" ) );
elessair	0:f269e3021894	3027
elessair	0:f269e3021894	3028	if( ( ret = mbedtls_ssl_derive_keys( ssl ) ) != 0 )
elessair	0:f269e3021894	3029	{
elessair	0:f269e3021894	3030	MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_derive_keys", ret );
elessair	0:f269e3021894	3031	return( ret );
elessair	0:f269e3021894	3032	}
elessair	0:f269e3021894	3033
elessair	0:f269e3021894	3034	if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_PSK \|\|
elessair	0:f269e3021894	3035	ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA_PSK \|\|
elessair	0:f269e3021894	3036	ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_PSK \|\|
elessair	0:f269e3021894	3037	ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_PSK \|\|
elessair	0:f269e3021894	3038	ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECJPAKE )
elessair	0:f269e3021894	3039	{
elessair	0:f269e3021894	3040	MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip write certificate verify" ) );
elessair	0:f269e3021894	3041	ssl->state++;
elessair	0:f269e3021894	3042	return( 0 );
elessair	0:f269e3021894	3043	}
elessair	0:f269e3021894	3044
elessair	0:f269e3021894	3045	if( ssl->client_auth == 0 \|\| mbedtls_ssl_own_cert( ssl ) == NULL )
elessair	0:f269e3021894	3046	{
elessair	0:f269e3021894	3047	MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip write certificate verify" ) );
elessair	0:f269e3021894	3048	ssl->state++;
elessair	0:f269e3021894	3049	return( 0 );
elessair	0:f269e3021894	3050	}
elessair	0:f269e3021894	3051
elessair	0:f269e3021894	3052	if( mbedtls_ssl_own_key( ssl ) == NULL )
elessair	0:f269e3021894	3053	{
elessair	0:f269e3021894	3054	MBEDTLS_SSL_DEBUG_MSG( 1, ( "got no private key for certificate" ) );
elessair	0:f269e3021894	3055	return( MBEDTLS_ERR_SSL_PRIVATE_KEY_REQUIRED );
elessair	0:f269e3021894	3056	}
elessair	0:f269e3021894	3057
elessair	0:f269e3021894	3058	/*
elessair	0:f269e3021894	3059	* Make an RSA signature of the handshake digests
elessair	0:f269e3021894	3060	*/
elessair	0:f269e3021894	3061	ssl->handshake->calc_verify( ssl, hash );
elessair	0:f269e3021894	3062
elessair	0:f269e3021894	3063	#if defined(MBEDTLS_SSL_PROTO_SSL3) \|\| defined(MBEDTLS_SSL_PROTO_TLS1) \|\| \
elessair	0:f269e3021894	3064	defined(MBEDTLS_SSL_PROTO_TLS1_1)
elessair	0:f269e3021894	3065	if( ssl->minor_ver != MBEDTLS_SSL_MINOR_VERSION_3 )
elessair	0:f269e3021894	3066	{
elessair	0:f269e3021894	3067	/*
elessair	0:f269e3021894	3068	* digitally-signed struct {
elessair	0:f269e3021894	3069	* opaque md5_hash[16];
elessair	0:f269e3021894	3070	* opaque sha_hash[20];
elessair	0:f269e3021894	3071	* };
elessair	0:f269e3021894	3072	*
elessair	0:f269e3021894	3073	* md5_hash
elessair	0:f269e3021894	3074	* MD5(handshake_messages);
elessair	0:f269e3021894	3075	*
elessair	0:f269e3021894	3076	* sha_hash
elessair	0:f269e3021894	3077	* SHA(handshake_messages);
elessair	0:f269e3021894	3078	*/
elessair	0:f269e3021894	3079	hashlen = 36;
elessair	0:f269e3021894	3080	md_alg = MBEDTLS_MD_NONE;
elessair	0:f269e3021894	3081
elessair	0:f269e3021894	3082	/*
elessair	0:f269e3021894	3083	* For ECDSA, default hash is SHA-1 only
elessair	0:f269e3021894	3084	*/
elessair	0:f269e3021894	3085	if( mbedtls_pk_can_do( mbedtls_ssl_own_key( ssl ), MBEDTLS_PK_ECDSA ) )
elessair	0:f269e3021894	3086	{
elessair	0:f269e3021894	3087	hash_start += 16;
elessair	0:f269e3021894	3088	hashlen -= 16;
elessair	0:f269e3021894	3089	md_alg = MBEDTLS_MD_SHA1;
elessair	0:f269e3021894	3090	}
elessair	0:f269e3021894	3091	}
elessair	0:f269e3021894	3092	else
elessair	0:f269e3021894	3093	#endif /* MBEDTLS_SSL_PROTO_SSL3 \|\| MBEDTLS_SSL_PROTO_TLS1 \|\| \
elessair	0:f269e3021894	3094	MBEDTLS_SSL_PROTO_TLS1_1 */
elessair	0:f269e3021894	3095	#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
elessair	0:f269e3021894	3096	if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 )
elessair	0:f269e3021894	3097	{
elessair	0:f269e3021894	3098	/*
elessair	0:f269e3021894	3099	* digitally-signed struct {
elessair	0:f269e3021894	3100	* opaque handshake_messages[handshake_messages_length];
elessair	0:f269e3021894	3101	* };
elessair	0:f269e3021894	3102	*
elessair	0:f269e3021894	3103	* Taking shortcut here. We assume that the server always allows the
elessair	0:f269e3021894	3104	* PRF Hash function and has sent it in the allowed signature
elessair	0:f269e3021894	3105	* algorithms list received in the Certificate Request message.
elessair	0:f269e3021894	3106	*
elessair	0:f269e3021894	3107	* Until we encounter a server that does not, we will take this
elessair	0:f269e3021894	3108	* shortcut.
elessair	0:f269e3021894	3109	*
elessair	0:f269e3021894	3110	* Reason: Otherwise we should have running hashes for SHA512 and SHA224
elessair	0:f269e3021894	3111	* in order to satisfy 'weird' needs from the server side.
elessair	0:f269e3021894	3112	*/
elessair	0:f269e3021894	3113	if( ssl->transform_negotiate->ciphersuite_info->mac ==
elessair	0:f269e3021894	3114	MBEDTLS_MD_SHA384 )
elessair	0:f269e3021894	3115	{
elessair	0:f269e3021894	3116	md_alg = MBEDTLS_MD_SHA384;
elessair	0:f269e3021894	3117	ssl->out_msg[4] = MBEDTLS_SSL_HASH_SHA384;
elessair	0:f269e3021894	3118	}
elessair	0:f269e3021894	3119	else
elessair	0:f269e3021894	3120	{
elessair	0:f269e3021894	3121	md_alg = MBEDTLS_MD_SHA256;
elessair	0:f269e3021894	3122	ssl->out_msg[4] = MBEDTLS_SSL_HASH_SHA256;
elessair	0:f269e3021894	3123	}
elessair	0:f269e3021894	3124	ssl->out_msg[5] = mbedtls_ssl_sig_from_pk( mbedtls_ssl_own_key( ssl ) );
elessair	0:f269e3021894	3125
elessair	0:f269e3021894	3126	/* Info from md_alg will be used instead */
elessair	0:f269e3021894	3127	hashlen = 0;
elessair	0:f269e3021894	3128	offset = 2;
elessair	0:f269e3021894	3129	}
elessair	0:f269e3021894	3130	else
elessair	0:f269e3021894	3131	#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
elessair	0:f269e3021894	3132	{
elessair	0:f269e3021894	3133	MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
elessair	0:f269e3021894	3134	return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
elessair	0:f269e3021894	3135	}
elessair	0:f269e3021894	3136
elessair	0:f269e3021894	3137	if( ( ret = mbedtls_pk_sign( mbedtls_ssl_own_key( ssl ), md_alg, hash_start, hashlen,
elessair	0:f269e3021894	3138	ssl->out_msg + 6 + offset, &n,
elessair	0:f269e3021894	3139	ssl->conf->f_rng, ssl->conf->p_rng ) ) != 0 )
elessair	0:f269e3021894	3140	{
elessair	0:f269e3021894	3141	MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_pk_sign", ret );
elessair	0:f269e3021894	3142	return( ret );
elessair	0:f269e3021894	3143	}
elessair	0:f269e3021894	3144
elessair	0:f269e3021894	3145	ssl->out_msg[4 + offset] = (unsigned char)( n >> 8 );
elessair	0:f269e3021894	3146	ssl->out_msg[5 + offset] = (unsigned char)( n );
elessair	0:f269e3021894	3147
elessair	0:f269e3021894	3148	ssl->out_msglen = 6 + n + offset;
elessair	0:f269e3021894	3149	ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE;
elessair	0:f269e3021894	3150	ssl->out_msg[0] = MBEDTLS_SSL_HS_CERTIFICATE_VERIFY;
elessair	0:f269e3021894	3151
elessair	0:f269e3021894	3152	ssl->state++;
elessair	0:f269e3021894	3153
elessair	0:f269e3021894	3154	if( ( ret = mbedtls_ssl_write_record( ssl ) ) != 0 )
elessair	0:f269e3021894	3155	{
elessair	0:f269e3021894	3156	MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_record", ret );
elessair	0:f269e3021894	3157	return( ret );
elessair	0:f269e3021894	3158	}
elessair	0:f269e3021894	3159
elessair	0:f269e3021894	3160	MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write certificate verify" ) );
elessair	0:f269e3021894	3161
elessair	0:f269e3021894	3162	return( ret );
elessair	0:f269e3021894	3163	}
elessair	0:f269e3021894	3164	#endif /* !MBEDTLS_KEY_EXCHANGE_RSA_ENABLED &&
elessair	0:f269e3021894	3165	!MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED &&
elessair	0:f269e3021894	3166	!MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED &&
elessair	0:f269e3021894	3167	!MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED &&
elessair	0:f269e3021894	3168	!MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED &&
elessair	0:f269e3021894	3169	!MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED */
elessair	0:f269e3021894	3170
elessair	0:f269e3021894	3171	#if defined(MBEDTLS_SSL_SESSION_TICKETS)
elessair	0:f269e3021894	3172	static int ssl_parse_new_session_ticket( mbedtls_ssl_context *ssl )
elessair	0:f269e3021894	3173	{
elessair	0:f269e3021894	3174	int ret;
elessair	0:f269e3021894	3175	uint32_t lifetime;
elessair	0:f269e3021894	3176	size_t ticket_len;
elessair	0:f269e3021894	3177	unsigned char *ticket;
elessair	0:f269e3021894	3178	const unsigned char *msg;
elessair	0:f269e3021894	3179
elessair	0:f269e3021894	3180	MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse new session ticket" ) );
elessair	0:f269e3021894	3181
elessair	0:f269e3021894	3182	if( ( ret = mbedtls_ssl_read_record( ssl ) ) != 0 )
elessair	0:f269e3021894	3183	{
elessair	0:f269e3021894	3184	MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_read_record", ret );
elessair	0:f269e3021894	3185	return( ret );
elessair	0:f269e3021894	3186	}
elessair	0:f269e3021894	3187
elessair	0:f269e3021894	3188	if( ssl->in_msgtype != MBEDTLS_SSL_MSG_HANDSHAKE )
elessair	0:f269e3021894	3189	{
elessair	0:f269e3021894	3190	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad new session ticket message" ) );
elessair	0:f269e3021894	3191	return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE );
elessair	0:f269e3021894	3192	}
elessair	0:f269e3021894	3193
elessair	0:f269e3021894	3194	/*
elessair	0:f269e3021894	3195	* struct {
elessair	0:f269e3021894	3196	* uint32 ticket_lifetime_hint;
elessair	0:f269e3021894	3197	* opaque ticket<0..2^16-1>;
elessair	0:f269e3021894	3198	* } NewSessionTicket;
elessair	0:f269e3021894	3199	*
elessair	0:f269e3021894	3200	* 0 . 3 ticket_lifetime_hint
elessair	0:f269e3021894	3201	* 4 . 5 ticket_len (n)
elessair	0:f269e3021894	3202	* 6 . 5+n ticket content
elessair	0:f269e3021894	3203	*/
elessair	0:f269e3021894	3204	if( ssl->in_msg[0] != MBEDTLS_SSL_HS_NEW_SESSION_TICKET \|\|
elessair	0:f269e3021894	3205	ssl->in_hslen < 6 + mbedtls_ssl_hs_hdr_len( ssl ) )
elessair	0:f269e3021894	3206	{
elessair	0:f269e3021894	3207	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad new session ticket message" ) );
elessair	0:f269e3021894	3208	return( MBEDTLS_ERR_SSL_BAD_HS_NEW_SESSION_TICKET );
elessair	0:f269e3021894	3209	}
elessair	0:f269e3021894	3210
elessair	0:f269e3021894	3211	msg = ssl->in_msg + mbedtls_ssl_hs_hdr_len( ssl );
elessair	0:f269e3021894	3212
elessair	0:f269e3021894	3213	lifetime = ( msg[0] << 24 ) \| ( msg[1] << 16 ) \|
elessair	0:f269e3021894	3214	( msg[2] << 8 ) \| ( msg[3] );
elessair	0:f269e3021894	3215
elessair	0:f269e3021894	3216	ticket_len = ( msg[4] << 8 ) \| ( msg[5] );
elessair	0:f269e3021894	3217
elessair	0:f269e3021894	3218	if( ticket_len + 6 + mbedtls_ssl_hs_hdr_len( ssl ) != ssl->in_hslen )
elessair	0:f269e3021894	3219	{
elessair	0:f269e3021894	3220	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad new session ticket message" ) );
elessair	0:f269e3021894	3221	return( MBEDTLS_ERR_SSL_BAD_HS_NEW_SESSION_TICKET );
elessair	0:f269e3021894	3222	}
elessair	0:f269e3021894	3223
elessair	0:f269e3021894	3224	MBEDTLS_SSL_DEBUG_MSG( 3, ( "ticket length: %d", ticket_len ) );
elessair	0:f269e3021894	3225
elessair	0:f269e3021894	3226	/* We're not waiting for a NewSessionTicket message any more */
elessair	0:f269e3021894	3227	ssl->handshake->new_session_ticket = 0;
elessair	0:f269e3021894	3228	ssl->state = MBEDTLS_SSL_SERVER_CHANGE_CIPHER_SPEC;
elessair	0:f269e3021894	3229
elessair	0:f269e3021894	3230	/*
elessair	0:f269e3021894	3231	* Zero-length ticket means the server changed his mind and doesn't want
elessair	0:f269e3021894	3232	* to send a ticket after all, so just forget it
elessair	0:f269e3021894	3233	*/
elessair	0:f269e3021894	3234	if( ticket_len == 0 )
elessair	0:f269e3021894	3235	return( 0 );
elessair	0:f269e3021894	3236
elessair	0:f269e3021894	3237	mbedtls_zeroize( ssl->session_negotiate->ticket,
elessair	0:f269e3021894	3238	ssl->session_negotiate->ticket_len );
elessair	0:f269e3021894	3239	mbedtls_free( ssl->session_negotiate->ticket );
elessair	0:f269e3021894	3240	ssl->session_negotiate->ticket = NULL;
elessair	0:f269e3021894	3241	ssl->session_negotiate->ticket_len = 0;
elessair	0:f269e3021894	3242
elessair	0:f269e3021894	3243	if( ( ticket = mbedtls_calloc( 1, ticket_len ) ) == NULL )
elessair	0:f269e3021894	3244	{
elessair	0:f269e3021894	3245	MBEDTLS_SSL_DEBUG_MSG( 1, ( "ticket alloc failed" ) );
elessair	0:f269e3021894	3246	return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
elessair	0:f269e3021894	3247	}
elessair	0:f269e3021894	3248
elessair	0:f269e3021894	3249	memcpy( ticket, msg + 6, ticket_len );
elessair	0:f269e3021894	3250
elessair	0:f269e3021894	3251	ssl->session_negotiate->ticket = ticket;
elessair	0:f269e3021894	3252	ssl->session_negotiate->ticket_len = ticket_len;
elessair	0:f269e3021894	3253	ssl->session_negotiate->ticket_lifetime = lifetime;
elessair	0:f269e3021894	3254
elessair	0:f269e3021894	3255	/*
elessair	0:f269e3021894	3256	* RFC 5077 section 3.4:
elessair	0:f269e3021894	3257	* "If the client receives a session ticket from the server, then it
elessair	0:f269e3021894	3258	* discards any Session ID that was sent in the ServerHello."
elessair	0:f269e3021894	3259	*/
elessair	0:f269e3021894	3260	MBEDTLS_SSL_DEBUG_MSG( 3, ( "ticket in use, discarding session id" ) );
elessair	0:f269e3021894	3261	ssl->session_negotiate->id_len = 0;
elessair	0:f269e3021894	3262
elessair	0:f269e3021894	3263	MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse new session ticket" ) );
elessair	0:f269e3021894	3264
elessair	0:f269e3021894	3265	return( 0 );
elessair	0:f269e3021894	3266	}
elessair	0:f269e3021894	3267	#endif /* MBEDTLS_SSL_SESSION_TICKETS */
elessair	0:f269e3021894	3268
elessair	0:f269e3021894	3269	/*
elessair	0:f269e3021894	3270	* SSL handshake -- client side -- single step
elessair	0:f269e3021894	3271	*/
elessair	0:f269e3021894	3272	int mbedtls_ssl_handshake_client_step( mbedtls_ssl_context *ssl )
elessair	0:f269e3021894	3273	{
elessair	0:f269e3021894	3274	int ret = 0;
elessair	0:f269e3021894	3275
elessair	0:f269e3021894	3276	if( ssl->state == MBEDTLS_SSL_HANDSHAKE_OVER \|\| ssl->handshake == NULL )
elessair	0:f269e3021894	3277	return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
elessair	0:f269e3021894	3278
elessair	0:f269e3021894	3279	MBEDTLS_SSL_DEBUG_MSG( 2, ( "client state: %d", ssl->state ) );
elessair	0:f269e3021894	3280
elessair	0:f269e3021894	3281	if( ( ret = mbedtls_ssl_flush_output( ssl ) ) != 0 )
elessair	0:f269e3021894	3282	return( ret );
elessair	0:f269e3021894	3283
elessair	0:f269e3021894	3284	#if defined(MBEDTLS_SSL_PROTO_DTLS)
elessair	0:f269e3021894	3285	if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
elessair	0:f269e3021894	3286	ssl->handshake->retransmit_state == MBEDTLS_SSL_RETRANS_SENDING )
elessair	0:f269e3021894	3287	{
elessair	0:f269e3021894	3288	if( ( ret = mbedtls_ssl_resend( ssl ) ) != 0 )
elessair	0:f269e3021894	3289	return( ret );
elessair	0:f269e3021894	3290	}
elessair	0:f269e3021894	3291	#endif
elessair	0:f269e3021894	3292
elessair	0:f269e3021894	3293	/* Change state now, so that it is right in mbedtls_ssl_read_record(), used
elessair	0:f269e3021894	3294	* by DTLS for dropping out-of-sequence ChangeCipherSpec records */
elessair	0:f269e3021894	3295	#if defined(MBEDTLS_SSL_SESSION_TICKETS)
elessair	0:f269e3021894	3296	if( ssl->state == MBEDTLS_SSL_SERVER_CHANGE_CIPHER_SPEC &&
elessair	0:f269e3021894	3297	ssl->handshake->new_session_ticket != 0 )
elessair	0:f269e3021894	3298	{
elessair	0:f269e3021894	3299	ssl->state = MBEDTLS_SSL_SERVER_NEW_SESSION_TICKET;
elessair	0:f269e3021894	3300	}
elessair	0:f269e3021894	3301	#endif
elessair	0:f269e3021894	3302
elessair	0:f269e3021894	3303	switch( ssl->state )
elessair	0:f269e3021894	3304	{
elessair	0:f269e3021894	3305	case MBEDTLS_SSL_HELLO_REQUEST:
elessair	0:f269e3021894	3306	ssl->state = MBEDTLS_SSL_CLIENT_HELLO;
elessair	0:f269e3021894	3307	break;
elessair	0:f269e3021894	3308
elessair	0:f269e3021894	3309	/*
elessair	0:f269e3021894	3310	* ==> ClientHello
elessair	0:f269e3021894	3311	*/
elessair	0:f269e3021894	3312	case MBEDTLS_SSL_CLIENT_HELLO:
elessair	0:f269e3021894	3313	ret = ssl_write_client_hello( ssl );
elessair	0:f269e3021894	3314	break;
elessair	0:f269e3021894	3315
elessair	0:f269e3021894	3316	/*
elessair	0:f269e3021894	3317	* <== ServerHello
elessair	0:f269e3021894	3318	* Certificate
elessair	0:f269e3021894	3319	* ( ServerKeyExchange )
elessair	0:f269e3021894	3320	* ( CertificateRequest )
elessair	0:f269e3021894	3321	* ServerHelloDone
elessair	0:f269e3021894	3322	*/
elessair	0:f269e3021894	3323	case MBEDTLS_SSL_SERVER_HELLO:
elessair	0:f269e3021894	3324	ret = ssl_parse_server_hello( ssl );
elessair	0:f269e3021894	3325	break;
elessair	0:f269e3021894	3326
elessair	0:f269e3021894	3327	case MBEDTLS_SSL_SERVER_CERTIFICATE:
elessair	0:f269e3021894	3328	ret = mbedtls_ssl_parse_certificate( ssl );
elessair	0:f269e3021894	3329	break;
elessair	0:f269e3021894	3330
elessair	0:f269e3021894	3331	case MBEDTLS_SSL_SERVER_KEY_EXCHANGE:
elessair	0:f269e3021894	3332	ret = ssl_parse_server_key_exchange( ssl );
elessair	0:f269e3021894	3333	break;
elessair	0:f269e3021894	3334
elessair	0:f269e3021894	3335	case MBEDTLS_SSL_CERTIFICATE_REQUEST:
elessair	0:f269e3021894	3336	ret = ssl_parse_certificate_request( ssl );
elessair	0:f269e3021894	3337	break;
elessair	0:f269e3021894	3338
elessair	0:f269e3021894	3339	case MBEDTLS_SSL_SERVER_HELLO_DONE:
elessair	0:f269e3021894	3340	ret = ssl_parse_server_hello_done( ssl );
elessair	0:f269e3021894	3341	break;
elessair	0:f269e3021894	3342
elessair	0:f269e3021894	3343	/*
elessair	0:f269e3021894	3344	* ==> ( Certificate/Alert )
elessair	0:f269e3021894	3345	* ClientKeyExchange
elessair	0:f269e3021894	3346	* ( CertificateVerify )
elessair	0:f269e3021894	3347	* ChangeCipherSpec
elessair	0:f269e3021894	3348	* Finished
elessair	0:f269e3021894	3349	*/
elessair	0:f269e3021894	3350	case MBEDTLS_SSL_CLIENT_CERTIFICATE:
elessair	0:f269e3021894	3351	ret = mbedtls_ssl_write_certificate( ssl );
elessair	0:f269e3021894	3352	break;
elessair	0:f269e3021894	3353
elessair	0:f269e3021894	3354	case MBEDTLS_SSL_CLIENT_KEY_EXCHANGE:
elessair	0:f269e3021894	3355	ret = ssl_write_client_key_exchange( ssl );
elessair	0:f269e3021894	3356	break;
elessair	0:f269e3021894	3357
elessair	0:f269e3021894	3358	case MBEDTLS_SSL_CERTIFICATE_VERIFY:
elessair	0:f269e3021894	3359	ret = ssl_write_certificate_verify( ssl );
elessair	0:f269e3021894	3360	break;
elessair	0:f269e3021894	3361
elessair	0:f269e3021894	3362	case MBEDTLS_SSL_CLIENT_CHANGE_CIPHER_SPEC:
elessair	0:f269e3021894	3363	ret = mbedtls_ssl_write_change_cipher_spec( ssl );
elessair	0:f269e3021894	3364	break;
elessair	0:f269e3021894	3365
elessair	0:f269e3021894	3366	case MBEDTLS_SSL_CLIENT_FINISHED:
elessair	0:f269e3021894	3367	ret = mbedtls_ssl_write_finished( ssl );
elessair	0:f269e3021894	3368	break;
elessair	0:f269e3021894	3369
elessair	0:f269e3021894	3370	/*
elessair	0:f269e3021894	3371	* <== ( NewSessionTicket )
elessair	0:f269e3021894	3372	* ChangeCipherSpec
elessair	0:f269e3021894	3373	* Finished
elessair	0:f269e3021894	3374	*/
elessair	0:f269e3021894	3375	#if defined(MBEDTLS_SSL_SESSION_TICKETS)
elessair	0:f269e3021894	3376	case MBEDTLS_SSL_SERVER_NEW_SESSION_TICKET:
elessair	0:f269e3021894	3377	ret = ssl_parse_new_session_ticket( ssl );
elessair	0:f269e3021894	3378	break;
elessair	0:f269e3021894	3379	#endif
elessair	0:f269e3021894	3380
elessair	0:f269e3021894	3381	case MBEDTLS_SSL_SERVER_CHANGE_CIPHER_SPEC:
elessair	0:f269e3021894	3382	ret = mbedtls_ssl_parse_change_cipher_spec( ssl );
elessair	0:f269e3021894	3383	break;
elessair	0:f269e3021894	3384
elessair	0:f269e3021894	3385	case MBEDTLS_SSL_SERVER_FINISHED:
elessair	0:f269e3021894	3386	ret = mbedtls_ssl_parse_finished( ssl );
elessair	0:f269e3021894	3387	break;
elessair	0:f269e3021894	3388
elessair	0:f269e3021894	3389	case MBEDTLS_SSL_FLUSH_BUFFERS:
elessair	0:f269e3021894	3390	MBEDTLS_SSL_DEBUG_MSG( 2, ( "handshake: done" ) );
elessair	0:f269e3021894	3391	ssl->state = MBEDTLS_SSL_HANDSHAKE_WRAPUP;
elessair	0:f269e3021894	3392	break;
elessair	0:f269e3021894	3393
elessair	0:f269e3021894	3394	case MBEDTLS_SSL_HANDSHAKE_WRAPUP:
elessair	0:f269e3021894	3395	mbedtls_ssl_handshake_wrapup( ssl );
elessair	0:f269e3021894	3396	break;
elessair	0:f269e3021894	3397
elessair	0:f269e3021894	3398	default:
elessair	0:f269e3021894	3399	MBEDTLS_SSL_DEBUG_MSG( 1, ( "invalid state %d", ssl->state ) );
elessair	0:f269e3021894	3400	return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
elessair	0:f269e3021894	3401	}
elessair	0:f269e3021894	3402
elessair	0:f269e3021894	3403	return( ret );
elessair	0:f269e3021894	3404	}
elessair	0:f269e3021894	3405	#endif /* MBEDTLS_SSL_CLI_C */

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Type:	Library
Created:	23 Oct 2016
Imports:	1689
Forks:	1
Commits:	1
Dependents:	3
Dependencies:	0
Followers:	20

features/mbedtls/src/ssl_cli.c@0:f269e3021894, 2016-10-23 (annotated)

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