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features/mbedtls/src/ssl_srv.c@0:b74591d5ab33, 2017-12-11 (annotated)

Committer:: be_bryan
Date:: Mon Dec 11 17:54:04 2017 +0000
Revision:: 0:b74591d5ab33

motor ++

Who changed what in which revision?

User	Revision	Line number	New contents of line
be_bryan	0:b74591d5ab33	1	/*
be_bryan	0:b74591d5ab33	2	* SSLv3/TLSv1 server-side functions
be_bryan	0:b74591d5ab33	3	*
be_bryan	0:b74591d5ab33	4	* Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
be_bryan	0:b74591d5ab33	5	* SPDX-License-Identifier: Apache-2.0
be_bryan	0:b74591d5ab33	6	*
be_bryan	0:b74591d5ab33	7	* Licensed under the Apache License, Version 2.0 (the "License"); you may
be_bryan	0:b74591d5ab33	8	* not use this file except in compliance with the License.
be_bryan	0:b74591d5ab33	9	* You may obtain a copy of the License at
be_bryan	0:b74591d5ab33	10	*
be_bryan	0:b74591d5ab33	11	* http://www.apache.org/licenses/LICENSE-2.0
be_bryan	0:b74591d5ab33	12	*
be_bryan	0:b74591d5ab33	13	* Unless required by applicable law or agreed to in writing, software
be_bryan	0:b74591d5ab33	14	* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
be_bryan	0:b74591d5ab33	15	* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
be_bryan	0:b74591d5ab33	16	* See the License for the specific language governing permissions and
be_bryan	0:b74591d5ab33	17	* limitations under the License.
be_bryan	0:b74591d5ab33	18	*
be_bryan	0:b74591d5ab33	19	* This file is part of mbed TLS (https://tls.mbed.org)
be_bryan	0:b74591d5ab33	20	*/
be_bryan	0:b74591d5ab33	21
be_bryan	0:b74591d5ab33	22	#if !defined(MBEDTLS_CONFIG_FILE)
be_bryan	0:b74591d5ab33	23	#include "mbedtls/config.h"
be_bryan	0:b74591d5ab33	24	#else
be_bryan	0:b74591d5ab33	25	#include MBEDTLS_CONFIG_FILE
be_bryan	0:b74591d5ab33	26	#endif
be_bryan	0:b74591d5ab33	27
be_bryan	0:b74591d5ab33	28	#if defined(MBEDTLS_SSL_SRV_C)
be_bryan	0:b74591d5ab33	29
be_bryan	0:b74591d5ab33	30	#if defined(MBEDTLS_PLATFORM_C)
be_bryan	0:b74591d5ab33	31	#include "mbedtls/platform.h"
be_bryan	0:b74591d5ab33	32	#else
be_bryan	0:b74591d5ab33	33	#include <stdlib.h>
be_bryan	0:b74591d5ab33	34	#define mbedtls_calloc calloc
be_bryan	0:b74591d5ab33	35	#define mbedtls_free free
be_bryan	0:b74591d5ab33	36	#endif
be_bryan	0:b74591d5ab33	37
be_bryan	0:b74591d5ab33	38	#include "mbedtls/debug.h"
be_bryan	0:b74591d5ab33	39	#include "mbedtls/ssl.h"
be_bryan	0:b74591d5ab33	40	#include "mbedtls/ssl_internal.h"
be_bryan	0:b74591d5ab33	41
be_bryan	0:b74591d5ab33	42	#include <string.h>
be_bryan	0:b74591d5ab33	43
be_bryan	0:b74591d5ab33	44	#if defined(MBEDTLS_ECP_C)
be_bryan	0:b74591d5ab33	45	#include "mbedtls/ecp.h"
be_bryan	0:b74591d5ab33	46	#endif
be_bryan	0:b74591d5ab33	47
be_bryan	0:b74591d5ab33	48	#if defined(MBEDTLS_HAVE_TIME)
be_bryan	0:b74591d5ab33	49	#include "mbedtls/platform_time.h"
be_bryan	0:b74591d5ab33	50	#endif
be_bryan	0:b74591d5ab33	51
be_bryan	0:b74591d5ab33	52	#if defined(MBEDTLS_SSL_SESSION_TICKETS)
be_bryan	0:b74591d5ab33	53	/* Implementation that should never be optimized out by the compiler */
be_bryan	0:b74591d5ab33	54	static void mbedtls_zeroize( void *v, size_t n ) {
be_bryan	0:b74591d5ab33	55	volatile unsigned char p = v; while( n-- ) p++ = 0;
be_bryan	0:b74591d5ab33	56	}
be_bryan	0:b74591d5ab33	57	#endif
be_bryan	0:b74591d5ab33	58
be_bryan	0:b74591d5ab33	59	#if defined(MBEDTLS_SSL_DTLS_HELLO_VERIFY)
be_bryan	0:b74591d5ab33	60	int mbedtls_ssl_set_client_transport_id( mbedtls_ssl_context *ssl,
be_bryan	0:b74591d5ab33	61	const unsigned char *info,
be_bryan	0:b74591d5ab33	62	size_t ilen )
be_bryan	0:b74591d5ab33	63	{
be_bryan	0:b74591d5ab33	64	if( ssl->conf->endpoint != MBEDTLS_SSL_IS_SERVER )
be_bryan	0:b74591d5ab33	65	return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
be_bryan	0:b74591d5ab33	66
be_bryan	0:b74591d5ab33	67	mbedtls_free( ssl->cli_id );
be_bryan	0:b74591d5ab33	68
be_bryan	0:b74591d5ab33	69	if( ( ssl->cli_id = mbedtls_calloc( 1, ilen ) ) == NULL )
be_bryan	0:b74591d5ab33	70	return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
be_bryan	0:b74591d5ab33	71
be_bryan	0:b74591d5ab33	72	memcpy( ssl->cli_id, info, ilen );
be_bryan	0:b74591d5ab33	73	ssl->cli_id_len = ilen;
be_bryan	0:b74591d5ab33	74
be_bryan	0:b74591d5ab33	75	return( 0 );
be_bryan	0:b74591d5ab33	76	}
be_bryan	0:b74591d5ab33	77
be_bryan	0:b74591d5ab33	78	void mbedtls_ssl_conf_dtls_cookies( mbedtls_ssl_config *conf,
be_bryan	0:b74591d5ab33	79	mbedtls_ssl_cookie_write_t *f_cookie_write,
be_bryan	0:b74591d5ab33	80	mbedtls_ssl_cookie_check_t *f_cookie_check,
be_bryan	0:b74591d5ab33	81	void *p_cookie )
be_bryan	0:b74591d5ab33	82	{
be_bryan	0:b74591d5ab33	83	conf->f_cookie_write = f_cookie_write;
be_bryan	0:b74591d5ab33	84	conf->f_cookie_check = f_cookie_check;
be_bryan	0:b74591d5ab33	85	conf->p_cookie = p_cookie;
be_bryan	0:b74591d5ab33	86	}
be_bryan	0:b74591d5ab33	87	#endif /* MBEDTLS_SSL_DTLS_HELLO_VERIFY */
be_bryan	0:b74591d5ab33	88
be_bryan	0:b74591d5ab33	89	#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
be_bryan	0:b74591d5ab33	90	static int ssl_parse_servername_ext( mbedtls_ssl_context *ssl,
be_bryan	0:b74591d5ab33	91	const unsigned char *buf,
be_bryan	0:b74591d5ab33	92	size_t len )
be_bryan	0:b74591d5ab33	93	{
be_bryan	0:b74591d5ab33	94	int ret;
be_bryan	0:b74591d5ab33	95	size_t servername_list_size, hostname_len;
be_bryan	0:b74591d5ab33	96	const unsigned char *p;
be_bryan	0:b74591d5ab33	97
be_bryan	0:b74591d5ab33	98	MBEDTLS_SSL_DEBUG_MSG( 3, ( "parse ServerName extension" ) );
be_bryan	0:b74591d5ab33	99
be_bryan	0:b74591d5ab33	100	servername_list_size = ( ( buf[0] << 8 ) \| ( buf[1] ) );
be_bryan	0:b74591d5ab33	101	if( servername_list_size + 2 != len )
be_bryan	0:b74591d5ab33	102	{
be_bryan	0:b74591d5ab33	103	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
be_bryan	0:b74591d5ab33	104	mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
be_bryan	0:b74591d5ab33	105	MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
be_bryan	0:b74591d5ab33	106	return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
be_bryan	0:b74591d5ab33	107	}
be_bryan	0:b74591d5ab33	108
be_bryan	0:b74591d5ab33	109	p = buf + 2;
be_bryan	0:b74591d5ab33	110	while( servername_list_size > 0 )
be_bryan	0:b74591d5ab33	111	{
be_bryan	0:b74591d5ab33	112	hostname_len = ( ( p[1] << 8 ) \| p[2] );
be_bryan	0:b74591d5ab33	113	if( hostname_len + 3 > servername_list_size )
be_bryan	0:b74591d5ab33	114	{
be_bryan	0:b74591d5ab33	115	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
be_bryan	0:b74591d5ab33	116	mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
be_bryan	0:b74591d5ab33	117	MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
be_bryan	0:b74591d5ab33	118	return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
be_bryan	0:b74591d5ab33	119	}
be_bryan	0:b74591d5ab33	120
be_bryan	0:b74591d5ab33	121	if( p[0] == MBEDTLS_TLS_EXT_SERVERNAME_HOSTNAME )
be_bryan	0:b74591d5ab33	122	{
be_bryan	0:b74591d5ab33	123	ret = ssl->conf->f_sni( ssl->conf->p_sni,
be_bryan	0:b74591d5ab33	124	ssl, p + 3, hostname_len );
be_bryan	0:b74591d5ab33	125	if( ret != 0 )
be_bryan	0:b74591d5ab33	126	{
be_bryan	0:b74591d5ab33	127	MBEDTLS_SSL_DEBUG_RET( 1, "ssl_sni_wrapper", ret );
be_bryan	0:b74591d5ab33	128	mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
be_bryan	0:b74591d5ab33	129	MBEDTLS_SSL_ALERT_MSG_UNRECOGNIZED_NAME );
be_bryan	0:b74591d5ab33	130	return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
be_bryan	0:b74591d5ab33	131	}
be_bryan	0:b74591d5ab33	132	return( 0 );
be_bryan	0:b74591d5ab33	133	}
be_bryan	0:b74591d5ab33	134
be_bryan	0:b74591d5ab33	135	servername_list_size -= hostname_len + 3;
be_bryan	0:b74591d5ab33	136	p += hostname_len + 3;
be_bryan	0:b74591d5ab33	137	}
be_bryan	0:b74591d5ab33	138
be_bryan	0:b74591d5ab33	139	if( servername_list_size != 0 )
be_bryan	0:b74591d5ab33	140	{
be_bryan	0:b74591d5ab33	141	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
be_bryan	0:b74591d5ab33	142	mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
be_bryan	0:b74591d5ab33	143	MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER );
be_bryan	0:b74591d5ab33	144	return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
be_bryan	0:b74591d5ab33	145	}
be_bryan	0:b74591d5ab33	146
be_bryan	0:b74591d5ab33	147	return( 0 );
be_bryan	0:b74591d5ab33	148	}
be_bryan	0:b74591d5ab33	149	#endif /* MBEDTLS_SSL_SERVER_NAME_INDICATION */
be_bryan	0:b74591d5ab33	150
be_bryan	0:b74591d5ab33	151	static int ssl_parse_renegotiation_info( mbedtls_ssl_context *ssl,
be_bryan	0:b74591d5ab33	152	const unsigned char *buf,
be_bryan	0:b74591d5ab33	153	size_t len )
be_bryan	0:b74591d5ab33	154	{
be_bryan	0:b74591d5ab33	155	#if defined(MBEDTLS_SSL_RENEGOTIATION)
be_bryan	0:b74591d5ab33	156	if( ssl->renego_status != MBEDTLS_SSL_INITIAL_HANDSHAKE )
be_bryan	0:b74591d5ab33	157	{
be_bryan	0:b74591d5ab33	158	/* Check verify-data in constant-time. The length OTOH is no secret */
be_bryan	0:b74591d5ab33	159	if( len != 1 + ssl->verify_data_len \|\|
be_bryan	0:b74591d5ab33	160	buf[0] != ssl->verify_data_len \|\|
be_bryan	0:b74591d5ab33	161	mbedtls_ssl_safer_memcmp( buf + 1, ssl->peer_verify_data,
be_bryan	0:b74591d5ab33	162	ssl->verify_data_len ) != 0 )
be_bryan	0:b74591d5ab33	163	{
be_bryan	0:b74591d5ab33	164	MBEDTLS_SSL_DEBUG_MSG( 1, ( "non-matching renegotiation info" ) );
be_bryan	0:b74591d5ab33	165	mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
be_bryan	0:b74591d5ab33	166	MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE );
be_bryan	0:b74591d5ab33	167	return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
be_bryan	0:b74591d5ab33	168	}
be_bryan	0:b74591d5ab33	169	}
be_bryan	0:b74591d5ab33	170	else
be_bryan	0:b74591d5ab33	171	#endif /* MBEDTLS_SSL_RENEGOTIATION */
be_bryan	0:b74591d5ab33	172	{
be_bryan	0:b74591d5ab33	173	if( len != 1 \|\| buf[0] != 0x0 )
be_bryan	0:b74591d5ab33	174	{
be_bryan	0:b74591d5ab33	175	MBEDTLS_SSL_DEBUG_MSG( 1, ( "non-zero length renegotiation info" ) );
be_bryan	0:b74591d5ab33	176	mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
be_bryan	0:b74591d5ab33	177	MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE );
be_bryan	0:b74591d5ab33	178	return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
be_bryan	0:b74591d5ab33	179	}
be_bryan	0:b74591d5ab33	180
be_bryan	0:b74591d5ab33	181	ssl->secure_renegotiation = MBEDTLS_SSL_SECURE_RENEGOTIATION;
be_bryan	0:b74591d5ab33	182	}
be_bryan	0:b74591d5ab33	183
be_bryan	0:b74591d5ab33	184	return( 0 );
be_bryan	0:b74591d5ab33	185	}
be_bryan	0:b74591d5ab33	186
be_bryan	0:b74591d5ab33	187	#if defined(MBEDTLS_SSL_PROTO_TLS1_2) && \
be_bryan	0:b74591d5ab33	188	defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED)
be_bryan	0:b74591d5ab33	189
be_bryan	0:b74591d5ab33	190	/*
be_bryan	0:b74591d5ab33	191	* Status of the implementation of signature-algorithms extension:
be_bryan	0:b74591d5ab33	192	*
be_bryan	0:b74591d5ab33	193	* Currently, we are only considering the signature-algorithm extension
be_bryan	0:b74591d5ab33	194	* to pick a ciphersuite which allows us to send the ServerKeyExchange
be_bryan	0:b74591d5ab33	195	* message with a signature-hash combination that the user allows.
be_bryan	0:b74591d5ab33	196	*
be_bryan	0:b74591d5ab33	197	* We do not check whether all certificates in our certificate
be_bryan	0:b74591d5ab33	198	* chain are signed with an allowed signature-hash pair.
be_bryan	0:b74591d5ab33	199	* This needs to be done at a later stage.
be_bryan	0:b74591d5ab33	200	*
be_bryan	0:b74591d5ab33	201	*/
be_bryan	0:b74591d5ab33	202	static int ssl_parse_signature_algorithms_ext( mbedtls_ssl_context *ssl,
be_bryan	0:b74591d5ab33	203	const unsigned char *buf,
be_bryan	0:b74591d5ab33	204	size_t len )
be_bryan	0:b74591d5ab33	205	{
be_bryan	0:b74591d5ab33	206	size_t sig_alg_list_size;
be_bryan	0:b74591d5ab33	207
be_bryan	0:b74591d5ab33	208	const unsigned char *p;
be_bryan	0:b74591d5ab33	209	const unsigned char *end = buf + len;
be_bryan	0:b74591d5ab33	210
be_bryan	0:b74591d5ab33	211	mbedtls_md_type_t md_cur;
be_bryan	0:b74591d5ab33	212	mbedtls_pk_type_t sig_cur;
be_bryan	0:b74591d5ab33	213
be_bryan	0:b74591d5ab33	214	sig_alg_list_size = ( ( buf[0] << 8 ) \| ( buf[1] ) );
be_bryan	0:b74591d5ab33	215	if( sig_alg_list_size + 2 != len \|\|
be_bryan	0:b74591d5ab33	216	sig_alg_list_size % 2 != 0 )
be_bryan	0:b74591d5ab33	217	{
be_bryan	0:b74591d5ab33	218	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
be_bryan	0:b74591d5ab33	219	mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
be_bryan	0:b74591d5ab33	220	MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
be_bryan	0:b74591d5ab33	221	return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
be_bryan	0:b74591d5ab33	222	}
be_bryan	0:b74591d5ab33	223
be_bryan	0:b74591d5ab33	224	/* Currently we only guarantee signing the ServerKeyExchange message according
be_bryan	0:b74591d5ab33	225	* to the constraints specified in this extension (see above), so it suffices
be_bryan	0:b74591d5ab33	226	* to remember only one suitable hash for each possible signature algorithm.
be_bryan	0:b74591d5ab33	227	*
be_bryan	0:b74591d5ab33	228	* This will change when we also consider certificate signatures,
be_bryan	0:b74591d5ab33	229	* in which case we will need to remember the whole signature-hash
be_bryan	0:b74591d5ab33	230	* pair list from the extension.
be_bryan	0:b74591d5ab33	231	*/
be_bryan	0:b74591d5ab33	232
be_bryan	0:b74591d5ab33	233	for( p = buf + 2; p < end; p += 2 )
be_bryan	0:b74591d5ab33	234	{
be_bryan	0:b74591d5ab33	235	/* Silently ignore unknown signature or hash algorithms. */
be_bryan	0:b74591d5ab33	236
be_bryan	0:b74591d5ab33	237	if( ( sig_cur = mbedtls_ssl_pk_alg_from_sig( p[1] ) ) == MBEDTLS_PK_NONE )
be_bryan	0:b74591d5ab33	238	{
be_bryan	0:b74591d5ab33	239	MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello v3, signature_algorithm ext"
be_bryan	0:b74591d5ab33	240	" unknown sig alg encoding %d", p[1] ) );
be_bryan	0:b74591d5ab33	241	continue;
be_bryan	0:b74591d5ab33	242	}
be_bryan	0:b74591d5ab33	243
be_bryan	0:b74591d5ab33	244	/* Check if we support the hash the user proposes */
be_bryan	0:b74591d5ab33	245	md_cur = mbedtls_ssl_md_alg_from_hash( p[0] );
be_bryan	0:b74591d5ab33	246	if( md_cur == MBEDTLS_MD_NONE )
be_bryan	0:b74591d5ab33	247	{
be_bryan	0:b74591d5ab33	248	MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello v3, signature_algorithm ext:"
be_bryan	0:b74591d5ab33	249	" unknown hash alg encoding %d", p[0] ) );
be_bryan	0:b74591d5ab33	250	continue;
be_bryan	0:b74591d5ab33	251	}
be_bryan	0:b74591d5ab33	252
be_bryan	0:b74591d5ab33	253	if( mbedtls_ssl_check_sig_hash( ssl, md_cur ) == 0 )
be_bryan	0:b74591d5ab33	254	{
be_bryan	0:b74591d5ab33	255	mbedtls_ssl_sig_hash_set_add( &ssl->handshake->hash_algs, sig_cur, md_cur );
be_bryan	0:b74591d5ab33	256	MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello v3, signature_algorithm ext:"
be_bryan	0:b74591d5ab33	257	" match sig %d and hash %d",
be_bryan	0:b74591d5ab33	258	sig_cur, md_cur ) );
be_bryan	0:b74591d5ab33	259	}
be_bryan	0:b74591d5ab33	260	else
be_bryan	0:b74591d5ab33	261	{
be_bryan	0:b74591d5ab33	262	MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello v3, signature_algorithm ext: "
be_bryan	0:b74591d5ab33	263	"hash alg %d not supported", md_cur ) );
be_bryan	0:b74591d5ab33	264	}
be_bryan	0:b74591d5ab33	265	}
be_bryan	0:b74591d5ab33	266
be_bryan	0:b74591d5ab33	267	return( 0 );
be_bryan	0:b74591d5ab33	268	}
be_bryan	0:b74591d5ab33	269	#endif /* MBEDTLS_SSL_PROTO_TLS1_2 &&
be_bryan	0:b74591d5ab33	270	MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED */
be_bryan	0:b74591d5ab33	271
be_bryan	0:b74591d5ab33	272	#if defined(MBEDTLS_ECDH_C) \|\| defined(MBEDTLS_ECDSA_C) \|\| \
be_bryan	0:b74591d5ab33	273	defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
be_bryan	0:b74591d5ab33	274	static int ssl_parse_supported_elliptic_curves( mbedtls_ssl_context *ssl,
be_bryan	0:b74591d5ab33	275	const unsigned char *buf,
be_bryan	0:b74591d5ab33	276	size_t len )
be_bryan	0:b74591d5ab33	277	{
be_bryan	0:b74591d5ab33	278	size_t list_size, our_size;
be_bryan	0:b74591d5ab33	279	const unsigned char *p;
be_bryan	0:b74591d5ab33	280	const mbedtls_ecp_curve_info curve_info, *curves;
be_bryan	0:b74591d5ab33	281
be_bryan	0:b74591d5ab33	282	list_size = ( ( buf[0] << 8 ) \| ( buf[1] ) );
be_bryan	0:b74591d5ab33	283	if( list_size + 2 != len \|\|
be_bryan	0:b74591d5ab33	284	list_size % 2 != 0 )
be_bryan	0:b74591d5ab33	285	{
be_bryan	0:b74591d5ab33	286	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
be_bryan	0:b74591d5ab33	287	mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
be_bryan	0:b74591d5ab33	288	MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
be_bryan	0:b74591d5ab33	289	return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
be_bryan	0:b74591d5ab33	290	}
be_bryan	0:b74591d5ab33	291
be_bryan	0:b74591d5ab33	292	/* Should never happen unless client duplicates the extension */
be_bryan	0:b74591d5ab33	293	if( ssl->handshake->curves != NULL )
be_bryan	0:b74591d5ab33	294	{
be_bryan	0:b74591d5ab33	295	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
be_bryan	0:b74591d5ab33	296	mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
be_bryan	0:b74591d5ab33	297	MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
be_bryan	0:b74591d5ab33	298	return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
be_bryan	0:b74591d5ab33	299	}
be_bryan	0:b74591d5ab33	300
be_bryan	0:b74591d5ab33	301	/* Don't allow our peer to make us allocate too much memory,
be_bryan	0:b74591d5ab33	302	* and leave room for a final 0 */
be_bryan	0:b74591d5ab33	303	our_size = list_size / 2 + 1;
be_bryan	0:b74591d5ab33	304	if( our_size > MBEDTLS_ECP_DP_MAX )
be_bryan	0:b74591d5ab33	305	our_size = MBEDTLS_ECP_DP_MAX;
be_bryan	0:b74591d5ab33	306
be_bryan	0:b74591d5ab33	307	if( ( curves = mbedtls_calloc( our_size, sizeof( *curves ) ) ) == NULL )
be_bryan	0:b74591d5ab33	308	{
be_bryan	0:b74591d5ab33	309	mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
be_bryan	0:b74591d5ab33	310	MBEDTLS_SSL_ALERT_MSG_INTERNAL_ERROR );
be_bryan	0:b74591d5ab33	311	return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
be_bryan	0:b74591d5ab33	312	}
be_bryan	0:b74591d5ab33	313
be_bryan	0:b74591d5ab33	314	ssl->handshake->curves = curves;
be_bryan	0:b74591d5ab33	315
be_bryan	0:b74591d5ab33	316	p = buf + 2;
be_bryan	0:b74591d5ab33	317	while( list_size > 0 && our_size > 1 )
be_bryan	0:b74591d5ab33	318	{
be_bryan	0:b74591d5ab33	319	curve_info = mbedtls_ecp_curve_info_from_tls_id( ( p[0] << 8 ) \| p[1] );
be_bryan	0:b74591d5ab33	320
be_bryan	0:b74591d5ab33	321	if( curve_info != NULL )
be_bryan	0:b74591d5ab33	322	{
be_bryan	0:b74591d5ab33	323	*curves++ = curve_info;
be_bryan	0:b74591d5ab33	324	our_size--;
be_bryan	0:b74591d5ab33	325	}
be_bryan	0:b74591d5ab33	326
be_bryan	0:b74591d5ab33	327	list_size -= 2;
be_bryan	0:b74591d5ab33	328	p += 2;
be_bryan	0:b74591d5ab33	329	}
be_bryan	0:b74591d5ab33	330
be_bryan	0:b74591d5ab33	331	return( 0 );
be_bryan	0:b74591d5ab33	332	}
be_bryan	0:b74591d5ab33	333
be_bryan	0:b74591d5ab33	334	static int ssl_parse_supported_point_formats( mbedtls_ssl_context *ssl,
be_bryan	0:b74591d5ab33	335	const unsigned char *buf,
be_bryan	0:b74591d5ab33	336	size_t len )
be_bryan	0:b74591d5ab33	337	{
be_bryan	0:b74591d5ab33	338	size_t list_size;
be_bryan	0:b74591d5ab33	339	const unsigned char *p;
be_bryan	0:b74591d5ab33	340
be_bryan	0:b74591d5ab33	341	list_size = buf[0];
be_bryan	0:b74591d5ab33	342	if( list_size + 1 != len )
be_bryan	0:b74591d5ab33	343	{
be_bryan	0:b74591d5ab33	344	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
be_bryan	0:b74591d5ab33	345	mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
be_bryan	0:b74591d5ab33	346	MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
be_bryan	0:b74591d5ab33	347	return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
be_bryan	0:b74591d5ab33	348	}
be_bryan	0:b74591d5ab33	349
be_bryan	0:b74591d5ab33	350	p = buf + 1;
be_bryan	0:b74591d5ab33	351	while( list_size > 0 )
be_bryan	0:b74591d5ab33	352	{
be_bryan	0:b74591d5ab33	353	if( p[0] == MBEDTLS_ECP_PF_UNCOMPRESSED \|\|
be_bryan	0:b74591d5ab33	354	p[0] == MBEDTLS_ECP_PF_COMPRESSED )
be_bryan	0:b74591d5ab33	355	{
be_bryan	0:b74591d5ab33	356	#if defined(MBEDTLS_ECDH_C) \|\| defined(MBEDTLS_ECDSA_C)
be_bryan	0:b74591d5ab33	357	ssl->handshake->ecdh_ctx.point_format = p[0];
be_bryan	0:b74591d5ab33	358	#endif
be_bryan	0:b74591d5ab33	359	#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
be_bryan	0:b74591d5ab33	360	ssl->handshake->ecjpake_ctx.point_format = p[0];
be_bryan	0:b74591d5ab33	361	#endif
be_bryan	0:b74591d5ab33	362	MBEDTLS_SSL_DEBUG_MSG( 4, ( "point format selected: %d", p[0] ) );
be_bryan	0:b74591d5ab33	363	return( 0 );
be_bryan	0:b74591d5ab33	364	}
be_bryan	0:b74591d5ab33	365
be_bryan	0:b74591d5ab33	366	list_size--;
be_bryan	0:b74591d5ab33	367	p++;
be_bryan	0:b74591d5ab33	368	}
be_bryan	0:b74591d5ab33	369
be_bryan	0:b74591d5ab33	370	return( 0 );
be_bryan	0:b74591d5ab33	371	}
be_bryan	0:b74591d5ab33	372	#endif /* MBEDTLS_ECDH_C \|\| MBEDTLS_ECDSA_C \|\|
be_bryan	0:b74591d5ab33	373	MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */
be_bryan	0:b74591d5ab33	374
be_bryan	0:b74591d5ab33	375	#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
be_bryan	0:b74591d5ab33	376	static int ssl_parse_ecjpake_kkpp( mbedtls_ssl_context *ssl,
be_bryan	0:b74591d5ab33	377	const unsigned char *buf,
be_bryan	0:b74591d5ab33	378	size_t len )
be_bryan	0:b74591d5ab33	379	{
be_bryan	0:b74591d5ab33	380	int ret;
be_bryan	0:b74591d5ab33	381
be_bryan	0:b74591d5ab33	382	if( mbedtls_ecjpake_check( &ssl->handshake->ecjpake_ctx ) != 0 )
be_bryan	0:b74591d5ab33	383	{
be_bryan	0:b74591d5ab33	384	MBEDTLS_SSL_DEBUG_MSG( 3, ( "skip ecjpake kkpp extension" ) );
be_bryan	0:b74591d5ab33	385	return( 0 );
be_bryan	0:b74591d5ab33	386	}
be_bryan	0:b74591d5ab33	387
be_bryan	0:b74591d5ab33	388	if( ( ret = mbedtls_ecjpake_read_round_one( &ssl->handshake->ecjpake_ctx,
be_bryan	0:b74591d5ab33	389	buf, len ) ) != 0 )
be_bryan	0:b74591d5ab33	390	{
be_bryan	0:b74591d5ab33	391	MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecjpake_read_round_one", ret );
be_bryan	0:b74591d5ab33	392	mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
be_bryan	0:b74591d5ab33	393	MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER );
be_bryan	0:b74591d5ab33	394	return( ret );
be_bryan	0:b74591d5ab33	395	}
be_bryan	0:b74591d5ab33	396
be_bryan	0:b74591d5ab33	397	/* Only mark the extension as OK when we're sure it is */
be_bryan	0:b74591d5ab33	398	ssl->handshake->cli_exts \|= MBEDTLS_TLS_EXT_ECJPAKE_KKPP_OK;
be_bryan	0:b74591d5ab33	399
be_bryan	0:b74591d5ab33	400	return( 0 );
be_bryan	0:b74591d5ab33	401	}
be_bryan	0:b74591d5ab33	402	#endif /* MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */
be_bryan	0:b74591d5ab33	403
be_bryan	0:b74591d5ab33	404	#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
be_bryan	0:b74591d5ab33	405	static int ssl_parse_max_fragment_length_ext( mbedtls_ssl_context *ssl,
be_bryan	0:b74591d5ab33	406	const unsigned char *buf,
be_bryan	0:b74591d5ab33	407	size_t len )
be_bryan	0:b74591d5ab33	408	{
be_bryan	0:b74591d5ab33	409	if( len != 1 \|\| buf[0] >= MBEDTLS_SSL_MAX_FRAG_LEN_INVALID )
be_bryan	0:b74591d5ab33	410	{
be_bryan	0:b74591d5ab33	411	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
be_bryan	0:b74591d5ab33	412	mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
be_bryan	0:b74591d5ab33	413	MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER );
be_bryan	0:b74591d5ab33	414	return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
be_bryan	0:b74591d5ab33	415	}
be_bryan	0:b74591d5ab33	416
be_bryan	0:b74591d5ab33	417	ssl->session_negotiate->mfl_code = buf[0];
be_bryan	0:b74591d5ab33	418
be_bryan	0:b74591d5ab33	419	return( 0 );
be_bryan	0:b74591d5ab33	420	}
be_bryan	0:b74591d5ab33	421	#endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */
be_bryan	0:b74591d5ab33	422
be_bryan	0:b74591d5ab33	423	#if defined(MBEDTLS_SSL_TRUNCATED_HMAC)
be_bryan	0:b74591d5ab33	424	static int ssl_parse_truncated_hmac_ext( mbedtls_ssl_context *ssl,
be_bryan	0:b74591d5ab33	425	const unsigned char *buf,
be_bryan	0:b74591d5ab33	426	size_t len )
be_bryan	0:b74591d5ab33	427	{
be_bryan	0:b74591d5ab33	428	if( len != 0 )
be_bryan	0:b74591d5ab33	429	{
be_bryan	0:b74591d5ab33	430	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
be_bryan	0:b74591d5ab33	431	mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
be_bryan	0:b74591d5ab33	432	MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
be_bryan	0:b74591d5ab33	433	return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
be_bryan	0:b74591d5ab33	434	}
be_bryan	0:b74591d5ab33	435
be_bryan	0:b74591d5ab33	436	((void) buf);
be_bryan	0:b74591d5ab33	437
be_bryan	0:b74591d5ab33	438	if( ssl->conf->trunc_hmac == MBEDTLS_SSL_TRUNC_HMAC_ENABLED )
be_bryan	0:b74591d5ab33	439	ssl->session_negotiate->trunc_hmac = MBEDTLS_SSL_TRUNC_HMAC_ENABLED;
be_bryan	0:b74591d5ab33	440
be_bryan	0:b74591d5ab33	441	return( 0 );
be_bryan	0:b74591d5ab33	442	}
be_bryan	0:b74591d5ab33	443	#endif /* MBEDTLS_SSL_TRUNCATED_HMAC */
be_bryan	0:b74591d5ab33	444
be_bryan	0:b74591d5ab33	445	#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
be_bryan	0:b74591d5ab33	446	static int ssl_parse_encrypt_then_mac_ext( mbedtls_ssl_context *ssl,
be_bryan	0:b74591d5ab33	447	const unsigned char *buf,
be_bryan	0:b74591d5ab33	448	size_t len )
be_bryan	0:b74591d5ab33	449	{
be_bryan	0:b74591d5ab33	450	if( len != 0 )
be_bryan	0:b74591d5ab33	451	{
be_bryan	0:b74591d5ab33	452	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
be_bryan	0:b74591d5ab33	453	mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
be_bryan	0:b74591d5ab33	454	MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
be_bryan	0:b74591d5ab33	455	return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
be_bryan	0:b74591d5ab33	456	}
be_bryan	0:b74591d5ab33	457
be_bryan	0:b74591d5ab33	458	((void) buf);
be_bryan	0:b74591d5ab33	459
be_bryan	0:b74591d5ab33	460	if( ssl->conf->encrypt_then_mac == MBEDTLS_SSL_ETM_ENABLED &&
be_bryan	0:b74591d5ab33	461	ssl->minor_ver != MBEDTLS_SSL_MINOR_VERSION_0 )
be_bryan	0:b74591d5ab33	462	{
be_bryan	0:b74591d5ab33	463	ssl->session_negotiate->encrypt_then_mac = MBEDTLS_SSL_ETM_ENABLED;
be_bryan	0:b74591d5ab33	464	}
be_bryan	0:b74591d5ab33	465
be_bryan	0:b74591d5ab33	466	return( 0 );
be_bryan	0:b74591d5ab33	467	}
be_bryan	0:b74591d5ab33	468	#endif /* MBEDTLS_SSL_ENCRYPT_THEN_MAC */
be_bryan	0:b74591d5ab33	469
be_bryan	0:b74591d5ab33	470	#if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET)
be_bryan	0:b74591d5ab33	471	static int ssl_parse_extended_ms_ext( mbedtls_ssl_context *ssl,
be_bryan	0:b74591d5ab33	472	const unsigned char *buf,
be_bryan	0:b74591d5ab33	473	size_t len )
be_bryan	0:b74591d5ab33	474	{
be_bryan	0:b74591d5ab33	475	if( len != 0 )
be_bryan	0:b74591d5ab33	476	{
be_bryan	0:b74591d5ab33	477	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
be_bryan	0:b74591d5ab33	478	mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
be_bryan	0:b74591d5ab33	479	MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
be_bryan	0:b74591d5ab33	480	return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
be_bryan	0:b74591d5ab33	481	}
be_bryan	0:b74591d5ab33	482
be_bryan	0:b74591d5ab33	483	((void) buf);
be_bryan	0:b74591d5ab33	484
be_bryan	0:b74591d5ab33	485	if( ssl->conf->extended_ms == MBEDTLS_SSL_EXTENDED_MS_ENABLED &&
be_bryan	0:b74591d5ab33	486	ssl->minor_ver != MBEDTLS_SSL_MINOR_VERSION_0 )
be_bryan	0:b74591d5ab33	487	{
be_bryan	0:b74591d5ab33	488	ssl->handshake->extended_ms = MBEDTLS_SSL_EXTENDED_MS_ENABLED;
be_bryan	0:b74591d5ab33	489	}
be_bryan	0:b74591d5ab33	490
be_bryan	0:b74591d5ab33	491	return( 0 );
be_bryan	0:b74591d5ab33	492	}
be_bryan	0:b74591d5ab33	493	#endif /* MBEDTLS_SSL_EXTENDED_MASTER_SECRET */
be_bryan	0:b74591d5ab33	494
be_bryan	0:b74591d5ab33	495	#if defined(MBEDTLS_SSL_SESSION_TICKETS)
be_bryan	0:b74591d5ab33	496	static int ssl_parse_session_ticket_ext( mbedtls_ssl_context *ssl,
be_bryan	0:b74591d5ab33	497	unsigned char *buf,
be_bryan	0:b74591d5ab33	498	size_t len )
be_bryan	0:b74591d5ab33	499	{
be_bryan	0:b74591d5ab33	500	int ret;
be_bryan	0:b74591d5ab33	501	mbedtls_ssl_session session;
be_bryan	0:b74591d5ab33	502
be_bryan	0:b74591d5ab33	503	mbedtls_ssl_session_init( &session );
be_bryan	0:b74591d5ab33	504
be_bryan	0:b74591d5ab33	505	if( ssl->conf->f_ticket_parse == NULL \|\|
be_bryan	0:b74591d5ab33	506	ssl->conf->f_ticket_write == NULL )
be_bryan	0:b74591d5ab33	507	{
be_bryan	0:b74591d5ab33	508	return( 0 );
be_bryan	0:b74591d5ab33	509	}
be_bryan	0:b74591d5ab33	510
be_bryan	0:b74591d5ab33	511	/* Remember the client asked us to send a new ticket */
be_bryan	0:b74591d5ab33	512	ssl->handshake->new_session_ticket = 1;
be_bryan	0:b74591d5ab33	513
be_bryan	0:b74591d5ab33	514	MBEDTLS_SSL_DEBUG_MSG( 3, ( "ticket length: %d", len ) );
be_bryan	0:b74591d5ab33	515
be_bryan	0:b74591d5ab33	516	if( len == 0 )
be_bryan	0:b74591d5ab33	517	return( 0 );
be_bryan	0:b74591d5ab33	518
be_bryan	0:b74591d5ab33	519	#if defined(MBEDTLS_SSL_RENEGOTIATION)
be_bryan	0:b74591d5ab33	520	if( ssl->renego_status != MBEDTLS_SSL_INITIAL_HANDSHAKE )
be_bryan	0:b74591d5ab33	521	{
be_bryan	0:b74591d5ab33	522	MBEDTLS_SSL_DEBUG_MSG( 3, ( "ticket rejected: renegotiating" ) );
be_bryan	0:b74591d5ab33	523	return( 0 );
be_bryan	0:b74591d5ab33	524	}
be_bryan	0:b74591d5ab33	525	#endif /* MBEDTLS_SSL_RENEGOTIATION */
be_bryan	0:b74591d5ab33	526
be_bryan	0:b74591d5ab33	527	/*
be_bryan	0:b74591d5ab33	528	* Failures are ok: just ignore the ticket and proceed.
be_bryan	0:b74591d5ab33	529	*/
be_bryan	0:b74591d5ab33	530	if( ( ret = ssl->conf->f_ticket_parse( ssl->conf->p_ticket, &session,
be_bryan	0:b74591d5ab33	531	buf, len ) ) != 0 )
be_bryan	0:b74591d5ab33	532	{
be_bryan	0:b74591d5ab33	533	mbedtls_ssl_session_free( &session );
be_bryan	0:b74591d5ab33	534
be_bryan	0:b74591d5ab33	535	if( ret == MBEDTLS_ERR_SSL_INVALID_MAC )
be_bryan	0:b74591d5ab33	536	MBEDTLS_SSL_DEBUG_MSG( 3, ( "ticket is not authentic" ) );
be_bryan	0:b74591d5ab33	537	else if( ret == MBEDTLS_ERR_SSL_SESSION_TICKET_EXPIRED )
be_bryan	0:b74591d5ab33	538	MBEDTLS_SSL_DEBUG_MSG( 3, ( "ticket is expired" ) );
be_bryan	0:b74591d5ab33	539	else
be_bryan	0:b74591d5ab33	540	MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_ticket_parse", ret );
be_bryan	0:b74591d5ab33	541
be_bryan	0:b74591d5ab33	542	return( 0 );
be_bryan	0:b74591d5ab33	543	}
be_bryan	0:b74591d5ab33	544
be_bryan	0:b74591d5ab33	545	/*
be_bryan	0:b74591d5ab33	546	* Keep the session ID sent by the client, since we MUST send it back to
be_bryan	0:b74591d5ab33	547	* inform them we're accepting the ticket (RFC 5077 section 3.4)
be_bryan	0:b74591d5ab33	548	*/
be_bryan	0:b74591d5ab33	549	session.id_len = ssl->session_negotiate->id_len;
be_bryan	0:b74591d5ab33	550	memcpy( &session.id, ssl->session_negotiate->id, session.id_len );
be_bryan	0:b74591d5ab33	551
be_bryan	0:b74591d5ab33	552	mbedtls_ssl_session_free( ssl->session_negotiate );
be_bryan	0:b74591d5ab33	553	memcpy( ssl->session_negotiate, &session, sizeof( mbedtls_ssl_session ) );
be_bryan	0:b74591d5ab33	554
be_bryan	0:b74591d5ab33	555	/* Zeroize instead of free as we copied the content */
be_bryan	0:b74591d5ab33	556	mbedtls_zeroize( &session, sizeof( mbedtls_ssl_session ) );
be_bryan	0:b74591d5ab33	557
be_bryan	0:b74591d5ab33	558	MBEDTLS_SSL_DEBUG_MSG( 3, ( "session successfully restored from ticket" ) );
be_bryan	0:b74591d5ab33	559
be_bryan	0:b74591d5ab33	560	ssl->handshake->resume = 1;
be_bryan	0:b74591d5ab33	561
be_bryan	0:b74591d5ab33	562	/* Don't send a new ticket after all, this one is OK */
be_bryan	0:b74591d5ab33	563	ssl->handshake->new_session_ticket = 0;
be_bryan	0:b74591d5ab33	564
be_bryan	0:b74591d5ab33	565	return( 0 );
be_bryan	0:b74591d5ab33	566	}
be_bryan	0:b74591d5ab33	567	#endif /* MBEDTLS_SSL_SESSION_TICKETS */
be_bryan	0:b74591d5ab33	568
be_bryan	0:b74591d5ab33	569	#if defined(MBEDTLS_SSL_ALPN)
be_bryan	0:b74591d5ab33	570	static int ssl_parse_alpn_ext( mbedtls_ssl_context *ssl,
be_bryan	0:b74591d5ab33	571	const unsigned char *buf, size_t len )
be_bryan	0:b74591d5ab33	572	{
be_bryan	0:b74591d5ab33	573	size_t list_len, cur_len, ours_len;
be_bryan	0:b74591d5ab33	574	const unsigned char theirs, start, *end;
be_bryan	0:b74591d5ab33	575	const char **ours;
be_bryan	0:b74591d5ab33	576
be_bryan	0:b74591d5ab33	577	/* If ALPN not configured, just ignore the extension */
be_bryan	0:b74591d5ab33	578	if( ssl->conf->alpn_list == NULL )
be_bryan	0:b74591d5ab33	579	return( 0 );
be_bryan	0:b74591d5ab33	580
be_bryan	0:b74591d5ab33	581	/*
be_bryan	0:b74591d5ab33	582	* opaque ProtocolName<1..2^8-1>;
be_bryan	0:b74591d5ab33	583	*
be_bryan	0:b74591d5ab33	584	* struct {
be_bryan	0:b74591d5ab33	585	* ProtocolName protocol_name_list<2..2^16-1>
be_bryan	0:b74591d5ab33	586	* } ProtocolNameList;
be_bryan	0:b74591d5ab33	587	*/
be_bryan	0:b74591d5ab33	588
be_bryan	0:b74591d5ab33	589	/* Min length is 2 (list_len) + 1 (name_len) + 1 (name) */
be_bryan	0:b74591d5ab33	590	if( len < 4 )
be_bryan	0:b74591d5ab33	591	{
be_bryan	0:b74591d5ab33	592	mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
be_bryan	0:b74591d5ab33	593	MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
be_bryan	0:b74591d5ab33	594	return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
be_bryan	0:b74591d5ab33	595	}
be_bryan	0:b74591d5ab33	596
be_bryan	0:b74591d5ab33	597	list_len = ( buf[0] << 8 ) \| buf[1];
be_bryan	0:b74591d5ab33	598	if( list_len != len - 2 )
be_bryan	0:b74591d5ab33	599	{
be_bryan	0:b74591d5ab33	600	mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
be_bryan	0:b74591d5ab33	601	MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
be_bryan	0:b74591d5ab33	602	return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
be_bryan	0:b74591d5ab33	603	}
be_bryan	0:b74591d5ab33	604
be_bryan	0:b74591d5ab33	605	/*
be_bryan	0:b74591d5ab33	606	* Use our order of preference
be_bryan	0:b74591d5ab33	607	*/
be_bryan	0:b74591d5ab33	608	start = buf + 2;
be_bryan	0:b74591d5ab33	609	end = buf + len;
be_bryan	0:b74591d5ab33	610	for( ours = ssl->conf->alpn_list; *ours != NULL; ours++ )
be_bryan	0:b74591d5ab33	611	{
be_bryan	0:b74591d5ab33	612	ours_len = strlen( *ours );
be_bryan	0:b74591d5ab33	613	for( theirs = start; theirs != end; theirs += cur_len )
be_bryan	0:b74591d5ab33	614	{
be_bryan	0:b74591d5ab33	615	/* If the list is well formed, we should get equality first */
be_bryan	0:b74591d5ab33	616	if( theirs > end )
be_bryan	0:b74591d5ab33	617	{
be_bryan	0:b74591d5ab33	618	mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
be_bryan	0:b74591d5ab33	619	MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER );
be_bryan	0:b74591d5ab33	620	return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
be_bryan	0:b74591d5ab33	621	}
be_bryan	0:b74591d5ab33	622
be_bryan	0:b74591d5ab33	623	cur_len = *theirs++;
be_bryan	0:b74591d5ab33	624
be_bryan	0:b74591d5ab33	625	/* Empty strings MUST NOT be included */
be_bryan	0:b74591d5ab33	626	if( cur_len == 0 )
be_bryan	0:b74591d5ab33	627	{
be_bryan	0:b74591d5ab33	628	mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
be_bryan	0:b74591d5ab33	629	MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER );
be_bryan	0:b74591d5ab33	630	return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
be_bryan	0:b74591d5ab33	631	}
be_bryan	0:b74591d5ab33	632
be_bryan	0:b74591d5ab33	633	if( cur_len == ours_len &&
be_bryan	0:b74591d5ab33	634	memcmp( theirs, *ours, cur_len ) == 0 )
be_bryan	0:b74591d5ab33	635	{
be_bryan	0:b74591d5ab33	636	ssl->alpn_chosen = *ours;
be_bryan	0:b74591d5ab33	637	return( 0 );
be_bryan	0:b74591d5ab33	638	}
be_bryan	0:b74591d5ab33	639	}
be_bryan	0:b74591d5ab33	640	}
be_bryan	0:b74591d5ab33	641
be_bryan	0:b74591d5ab33	642	/* If we get there, no match was found */
be_bryan	0:b74591d5ab33	643	mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
be_bryan	0:b74591d5ab33	644	MBEDTLS_SSL_ALERT_MSG_NO_APPLICATION_PROTOCOL );
be_bryan	0:b74591d5ab33	645	return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
be_bryan	0:b74591d5ab33	646	}
be_bryan	0:b74591d5ab33	647	#endif /* MBEDTLS_SSL_ALPN */
be_bryan	0:b74591d5ab33	648
be_bryan	0:b74591d5ab33	649	/*
be_bryan	0:b74591d5ab33	650	* Auxiliary functions for ServerHello parsing and related actions
be_bryan	0:b74591d5ab33	651	*/
be_bryan	0:b74591d5ab33	652
be_bryan	0:b74591d5ab33	653	#if defined(MBEDTLS_X509_CRT_PARSE_C)
be_bryan	0:b74591d5ab33	654	/*
be_bryan	0:b74591d5ab33	655	* Return 0 if the given key uses one of the acceptable curves, -1 otherwise
be_bryan	0:b74591d5ab33	656	*/
be_bryan	0:b74591d5ab33	657	#if defined(MBEDTLS_ECDSA_C)
be_bryan	0:b74591d5ab33	658	static int ssl_check_key_curve( mbedtls_pk_context *pk,
be_bryan	0:b74591d5ab33	659	const mbedtls_ecp_curve_info **curves )
be_bryan	0:b74591d5ab33	660	{
be_bryan	0:b74591d5ab33	661	const mbedtls_ecp_curve_info **crv = curves;
be_bryan	0:b74591d5ab33	662	mbedtls_ecp_group_id grp_id = mbedtls_pk_ec( *pk )->grp.id;
be_bryan	0:b74591d5ab33	663
be_bryan	0:b74591d5ab33	664	while( *crv != NULL )
be_bryan	0:b74591d5ab33	665	{
be_bryan	0:b74591d5ab33	666	if( (*crv)->grp_id == grp_id )
be_bryan	0:b74591d5ab33	667	return( 0 );
be_bryan	0:b74591d5ab33	668	crv++;
be_bryan	0:b74591d5ab33	669	}
be_bryan	0:b74591d5ab33	670
be_bryan	0:b74591d5ab33	671	return( -1 );
be_bryan	0:b74591d5ab33	672	}
be_bryan	0:b74591d5ab33	673	#endif /* MBEDTLS_ECDSA_C */
be_bryan	0:b74591d5ab33	674
be_bryan	0:b74591d5ab33	675	/*
be_bryan	0:b74591d5ab33	676	* Try picking a certificate for this ciphersuite,
be_bryan	0:b74591d5ab33	677	* return 0 on success and -1 on failure.
be_bryan	0:b74591d5ab33	678	*/
be_bryan	0:b74591d5ab33	679	static int ssl_pick_cert( mbedtls_ssl_context *ssl,
be_bryan	0:b74591d5ab33	680	const mbedtls_ssl_ciphersuite_t * ciphersuite_info )
be_bryan	0:b74591d5ab33	681	{
be_bryan	0:b74591d5ab33	682	mbedtls_ssl_key_cert cur, list, *fallback = NULL;
be_bryan	0:b74591d5ab33	683	mbedtls_pk_type_t pk_alg =
be_bryan	0:b74591d5ab33	684	mbedtls_ssl_get_ciphersuite_sig_pk_alg( ciphersuite_info );
be_bryan	0:b74591d5ab33	685	uint32_t flags;
be_bryan	0:b74591d5ab33	686
be_bryan	0:b74591d5ab33	687	#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
be_bryan	0:b74591d5ab33	688	if( ssl->handshake->sni_key_cert != NULL )
be_bryan	0:b74591d5ab33	689	list = ssl->handshake->sni_key_cert;
be_bryan	0:b74591d5ab33	690	else
be_bryan	0:b74591d5ab33	691	#endif
be_bryan	0:b74591d5ab33	692	list = ssl->conf->key_cert;
be_bryan	0:b74591d5ab33	693
be_bryan	0:b74591d5ab33	694	if( pk_alg == MBEDTLS_PK_NONE )
be_bryan	0:b74591d5ab33	695	return( 0 );
be_bryan	0:b74591d5ab33	696
be_bryan	0:b74591d5ab33	697	MBEDTLS_SSL_DEBUG_MSG( 3, ( "ciphersuite requires certificate" ) );
be_bryan	0:b74591d5ab33	698
be_bryan	0:b74591d5ab33	699	if( list == NULL )
be_bryan	0:b74591d5ab33	700	{
be_bryan	0:b74591d5ab33	701	MBEDTLS_SSL_DEBUG_MSG( 3, ( "server has no certificate" ) );
be_bryan	0:b74591d5ab33	702	return( -1 );
be_bryan	0:b74591d5ab33	703	}
be_bryan	0:b74591d5ab33	704
be_bryan	0:b74591d5ab33	705	for( cur = list; cur != NULL; cur = cur->next )
be_bryan	0:b74591d5ab33	706	{
be_bryan	0:b74591d5ab33	707	MBEDTLS_SSL_DEBUG_CRT( 3, "candidate certificate chain, certificate",
be_bryan	0:b74591d5ab33	708	cur->cert );
be_bryan	0:b74591d5ab33	709
be_bryan	0:b74591d5ab33	710	if( ! mbedtls_pk_can_do( cur->key, pk_alg ) )
be_bryan	0:b74591d5ab33	711	{
be_bryan	0:b74591d5ab33	712	MBEDTLS_SSL_DEBUG_MSG( 3, ( "certificate mismatch: key type" ) );
be_bryan	0:b74591d5ab33	713	continue;
be_bryan	0:b74591d5ab33	714	}
be_bryan	0:b74591d5ab33	715
be_bryan	0:b74591d5ab33	716	/*
be_bryan	0:b74591d5ab33	717	* This avoids sending the client a cert it'll reject based on
be_bryan	0:b74591d5ab33	718	* keyUsage or other extensions.
be_bryan	0:b74591d5ab33	719	*
be_bryan	0:b74591d5ab33	720	* It also allows the user to provision different certificates for
be_bryan	0:b74591d5ab33	721	* different uses based on keyUsage, eg if they want to avoid signing
be_bryan	0:b74591d5ab33	722	* and decrypting with the same RSA key.
be_bryan	0:b74591d5ab33	723	*/
be_bryan	0:b74591d5ab33	724	if( mbedtls_ssl_check_cert_usage( cur->cert, ciphersuite_info,
be_bryan	0:b74591d5ab33	725	MBEDTLS_SSL_IS_SERVER, &flags ) != 0 )
be_bryan	0:b74591d5ab33	726	{
be_bryan	0:b74591d5ab33	727	MBEDTLS_SSL_DEBUG_MSG( 3, ( "certificate mismatch: "
be_bryan	0:b74591d5ab33	728	"(extended) key usage extension" ) );
be_bryan	0:b74591d5ab33	729	continue;
be_bryan	0:b74591d5ab33	730	}
be_bryan	0:b74591d5ab33	731
be_bryan	0:b74591d5ab33	732	#if defined(MBEDTLS_ECDSA_C)
be_bryan	0:b74591d5ab33	733	if( pk_alg == MBEDTLS_PK_ECDSA &&
be_bryan	0:b74591d5ab33	734	ssl_check_key_curve( cur->key, ssl->handshake->curves ) != 0 )
be_bryan	0:b74591d5ab33	735	{
be_bryan	0:b74591d5ab33	736	MBEDTLS_SSL_DEBUG_MSG( 3, ( "certificate mismatch: elliptic curve" ) );
be_bryan	0:b74591d5ab33	737	continue;
be_bryan	0:b74591d5ab33	738	}
be_bryan	0:b74591d5ab33	739	#endif
be_bryan	0:b74591d5ab33	740
be_bryan	0:b74591d5ab33	741	/*
be_bryan	0:b74591d5ab33	742	* Try to select a SHA-1 certificate for pre-1.2 clients, but still
be_bryan	0:b74591d5ab33	743	* present them a SHA-higher cert rather than failing if it's the only
be_bryan	0:b74591d5ab33	744	* one we got that satisfies the other conditions.
be_bryan	0:b74591d5ab33	745	*/
be_bryan	0:b74591d5ab33	746	if( ssl->minor_ver < MBEDTLS_SSL_MINOR_VERSION_3 &&
be_bryan	0:b74591d5ab33	747	cur->cert->sig_md != MBEDTLS_MD_SHA1 )
be_bryan	0:b74591d5ab33	748	{
be_bryan	0:b74591d5ab33	749	if( fallback == NULL )
be_bryan	0:b74591d5ab33	750	fallback = cur;
be_bryan	0:b74591d5ab33	751	{
be_bryan	0:b74591d5ab33	752	MBEDTLS_SSL_DEBUG_MSG( 3, ( "certificate not preferred: "
be_bryan	0:b74591d5ab33	753	"sha-2 with pre-TLS 1.2 client" ) );
be_bryan	0:b74591d5ab33	754	continue;
be_bryan	0:b74591d5ab33	755	}
be_bryan	0:b74591d5ab33	756	}
be_bryan	0:b74591d5ab33	757
be_bryan	0:b74591d5ab33	758	/* If we get there, we got a winner */
be_bryan	0:b74591d5ab33	759	break;
be_bryan	0:b74591d5ab33	760	}
be_bryan	0:b74591d5ab33	761
be_bryan	0:b74591d5ab33	762	if( cur == NULL )
be_bryan	0:b74591d5ab33	763	cur = fallback;
be_bryan	0:b74591d5ab33	764
be_bryan	0:b74591d5ab33	765	/* Do not update ssl->handshake->key_cert unless there is a match */
be_bryan	0:b74591d5ab33	766	if( cur != NULL )
be_bryan	0:b74591d5ab33	767	{
be_bryan	0:b74591d5ab33	768	ssl->handshake->key_cert = cur;
be_bryan	0:b74591d5ab33	769	MBEDTLS_SSL_DEBUG_CRT( 3, "selected certificate chain, certificate",
be_bryan	0:b74591d5ab33	770	ssl->handshake->key_cert->cert );
be_bryan	0:b74591d5ab33	771	return( 0 );
be_bryan	0:b74591d5ab33	772	}
be_bryan	0:b74591d5ab33	773
be_bryan	0:b74591d5ab33	774	return( -1 );
be_bryan	0:b74591d5ab33	775	}
be_bryan	0:b74591d5ab33	776	#endif /* MBEDTLS_X509_CRT_PARSE_C */
be_bryan	0:b74591d5ab33	777
be_bryan	0:b74591d5ab33	778	/*
be_bryan	0:b74591d5ab33	779	* Check if a given ciphersuite is suitable for use with our config/keys/etc
be_bryan	0:b74591d5ab33	780	* Sets ciphersuite_info only if the suite matches.
be_bryan	0:b74591d5ab33	781	*/
be_bryan	0:b74591d5ab33	782	static int ssl_ciphersuite_match( mbedtls_ssl_context *ssl, int suite_id,
be_bryan	0:b74591d5ab33	783	const mbedtls_ssl_ciphersuite_t **ciphersuite_info )
be_bryan	0:b74591d5ab33	784	{
be_bryan	0:b74591d5ab33	785	const mbedtls_ssl_ciphersuite_t *suite_info;
be_bryan	0:b74591d5ab33	786
be_bryan	0:b74591d5ab33	787	#if defined(MBEDTLS_SSL_PROTO_TLS1_2) && \
be_bryan	0:b74591d5ab33	788	defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED)
be_bryan	0:b74591d5ab33	789	mbedtls_pk_type_t sig_type;
be_bryan	0:b74591d5ab33	790	#endif
be_bryan	0:b74591d5ab33	791
be_bryan	0:b74591d5ab33	792	suite_info = mbedtls_ssl_ciphersuite_from_id( suite_id );
be_bryan	0:b74591d5ab33	793	if( suite_info == NULL )
be_bryan	0:b74591d5ab33	794	{
be_bryan	0:b74591d5ab33	795	MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
be_bryan	0:b74591d5ab33	796	return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
be_bryan	0:b74591d5ab33	797	}
be_bryan	0:b74591d5ab33	798
be_bryan	0:b74591d5ab33	799	MBEDTLS_SSL_DEBUG_MSG( 3, ( "trying ciphersuite: %s", suite_info->name ) );
be_bryan	0:b74591d5ab33	800
be_bryan	0:b74591d5ab33	801	if( suite_info->min_minor_ver > ssl->minor_ver \|\|
be_bryan	0:b74591d5ab33	802	suite_info->max_minor_ver < ssl->minor_ver )
be_bryan	0:b74591d5ab33	803	{
be_bryan	0:b74591d5ab33	804	MBEDTLS_SSL_DEBUG_MSG( 3, ( "ciphersuite mismatch: version" ) );
be_bryan	0:b74591d5ab33	805	return( 0 );
be_bryan	0:b74591d5ab33	806	}
be_bryan	0:b74591d5ab33	807
be_bryan	0:b74591d5ab33	808	#if defined(MBEDTLS_SSL_PROTO_DTLS)
be_bryan	0:b74591d5ab33	809	if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
be_bryan	0:b74591d5ab33	810	( suite_info->flags & MBEDTLS_CIPHERSUITE_NODTLS ) )
be_bryan	0:b74591d5ab33	811	return( 0 );
be_bryan	0:b74591d5ab33	812	#endif
be_bryan	0:b74591d5ab33	813
be_bryan	0:b74591d5ab33	814	#if defined(MBEDTLS_ARC4_C)
be_bryan	0:b74591d5ab33	815	if( ssl->conf->arc4_disabled == MBEDTLS_SSL_ARC4_DISABLED &&
be_bryan	0:b74591d5ab33	816	suite_info->cipher == MBEDTLS_CIPHER_ARC4_128 )
be_bryan	0:b74591d5ab33	817	{
be_bryan	0:b74591d5ab33	818	MBEDTLS_SSL_DEBUG_MSG( 3, ( "ciphersuite mismatch: rc4" ) );
be_bryan	0:b74591d5ab33	819	return( 0 );
be_bryan	0:b74591d5ab33	820	}
be_bryan	0:b74591d5ab33	821	#endif
be_bryan	0:b74591d5ab33	822
be_bryan	0:b74591d5ab33	823	#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
be_bryan	0:b74591d5ab33	824	if( suite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECJPAKE &&
be_bryan	0:b74591d5ab33	825	( ssl->handshake->cli_exts & MBEDTLS_TLS_EXT_ECJPAKE_KKPP_OK ) == 0 )
be_bryan	0:b74591d5ab33	826	{
be_bryan	0:b74591d5ab33	827	MBEDTLS_SSL_DEBUG_MSG( 3, ( "ciphersuite mismatch: ecjpake "
be_bryan	0:b74591d5ab33	828	"not configured or ext missing" ) );
be_bryan	0:b74591d5ab33	829	return( 0 );
be_bryan	0:b74591d5ab33	830	}
be_bryan	0:b74591d5ab33	831	#endif
be_bryan	0:b74591d5ab33	832
be_bryan	0:b74591d5ab33	833
be_bryan	0:b74591d5ab33	834	#if defined(MBEDTLS_ECDH_C) \|\| defined(MBEDTLS_ECDSA_C)
be_bryan	0:b74591d5ab33	835	if( mbedtls_ssl_ciphersuite_uses_ec( suite_info ) &&
be_bryan	0:b74591d5ab33	836	( ssl->handshake->curves == NULL \|\|
be_bryan	0:b74591d5ab33	837	ssl->handshake->curves[0] == NULL ) )
be_bryan	0:b74591d5ab33	838	{
be_bryan	0:b74591d5ab33	839	MBEDTLS_SSL_DEBUG_MSG( 3, ( "ciphersuite mismatch: "
be_bryan	0:b74591d5ab33	840	"no common elliptic curve" ) );
be_bryan	0:b74591d5ab33	841	return( 0 );
be_bryan	0:b74591d5ab33	842	}
be_bryan	0:b74591d5ab33	843	#endif
be_bryan	0:b74591d5ab33	844
be_bryan	0:b74591d5ab33	845	#if defined(MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED)
be_bryan	0:b74591d5ab33	846	/* If the ciphersuite requires a pre-shared key and we don't
be_bryan	0:b74591d5ab33	847	* have one, skip it now rather than failing later */
be_bryan	0:b74591d5ab33	848	if( mbedtls_ssl_ciphersuite_uses_psk( suite_info ) &&
be_bryan	0:b74591d5ab33	849	ssl->conf->f_psk == NULL &&
be_bryan	0:b74591d5ab33	850	( ssl->conf->psk == NULL \|\| ssl->conf->psk_identity == NULL \|\|
be_bryan	0:b74591d5ab33	851	ssl->conf->psk_identity_len == 0 \|\| ssl->conf->psk_len == 0 ) )
be_bryan	0:b74591d5ab33	852	{
be_bryan	0:b74591d5ab33	853	MBEDTLS_SSL_DEBUG_MSG( 3, ( "ciphersuite mismatch: no pre-shared key" ) );
be_bryan	0:b74591d5ab33	854	return( 0 );
be_bryan	0:b74591d5ab33	855	}
be_bryan	0:b74591d5ab33	856	#endif
be_bryan	0:b74591d5ab33	857
be_bryan	0:b74591d5ab33	858	#if defined(MBEDTLS_SSL_PROTO_TLS1_2) && \
be_bryan	0:b74591d5ab33	859	defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED)
be_bryan	0:b74591d5ab33	860	/* If the ciphersuite requires signing, check whether
be_bryan	0:b74591d5ab33	861	* a suitable hash algorithm is present. */
be_bryan	0:b74591d5ab33	862	if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 )
be_bryan	0:b74591d5ab33	863	{
be_bryan	0:b74591d5ab33	864	sig_type = mbedtls_ssl_get_ciphersuite_sig_alg( suite_info );
be_bryan	0:b74591d5ab33	865	if( sig_type != MBEDTLS_PK_NONE &&
be_bryan	0:b74591d5ab33	866	mbedtls_ssl_sig_hash_set_find( &ssl->handshake->hash_algs, sig_type ) == MBEDTLS_MD_NONE )
be_bryan	0:b74591d5ab33	867	{
be_bryan	0:b74591d5ab33	868	MBEDTLS_SSL_DEBUG_MSG( 3, ( "ciphersuite mismatch: no suitable hash algorithm "
be_bryan	0:b74591d5ab33	869	"for signature algorithm %d", sig_type ) );
be_bryan	0:b74591d5ab33	870	return( 0 );
be_bryan	0:b74591d5ab33	871	}
be_bryan	0:b74591d5ab33	872	}
be_bryan	0:b74591d5ab33	873
be_bryan	0:b74591d5ab33	874	#endif /* MBEDTLS_SSL_PROTO_TLS1_2 &&
be_bryan	0:b74591d5ab33	875	MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED */
be_bryan	0:b74591d5ab33	876
be_bryan	0:b74591d5ab33	877	#if defined(MBEDTLS_X509_CRT_PARSE_C)
be_bryan	0:b74591d5ab33	878	/*
be_bryan	0:b74591d5ab33	879	* Final check: if ciphersuite requires us to have a
be_bryan	0:b74591d5ab33	880	* certificate/key of a particular type:
be_bryan	0:b74591d5ab33	881	* - select the appropriate certificate if we have one, or
be_bryan	0:b74591d5ab33	882	* - try the next ciphersuite if we don't
be_bryan	0:b74591d5ab33	883	* This must be done last since we modify the key_cert list.
be_bryan	0:b74591d5ab33	884	*/
be_bryan	0:b74591d5ab33	885	if( ssl_pick_cert( ssl, suite_info ) != 0 )
be_bryan	0:b74591d5ab33	886	{
be_bryan	0:b74591d5ab33	887	MBEDTLS_SSL_DEBUG_MSG( 3, ( "ciphersuite mismatch: "
be_bryan	0:b74591d5ab33	888	"no suitable certificate" ) );
be_bryan	0:b74591d5ab33	889	return( 0 );
be_bryan	0:b74591d5ab33	890	}
be_bryan	0:b74591d5ab33	891	#endif
be_bryan	0:b74591d5ab33	892
be_bryan	0:b74591d5ab33	893	*ciphersuite_info = suite_info;
be_bryan	0:b74591d5ab33	894	return( 0 );
be_bryan	0:b74591d5ab33	895	}
be_bryan	0:b74591d5ab33	896
be_bryan	0:b74591d5ab33	897	#if defined(MBEDTLS_SSL_SRV_SUPPORT_SSLV2_CLIENT_HELLO)
be_bryan	0:b74591d5ab33	898	static int ssl_parse_client_hello_v2( mbedtls_ssl_context *ssl )
be_bryan	0:b74591d5ab33	899	{
be_bryan	0:b74591d5ab33	900	int ret, got_common_suite;
be_bryan	0:b74591d5ab33	901	unsigned int i, j;
be_bryan	0:b74591d5ab33	902	size_t n;
be_bryan	0:b74591d5ab33	903	unsigned int ciph_len, sess_len, chal_len;
be_bryan	0:b74591d5ab33	904	unsigned char buf, p;
be_bryan	0:b74591d5ab33	905	const int *ciphersuites;
be_bryan	0:b74591d5ab33	906	const mbedtls_ssl_ciphersuite_t *ciphersuite_info;
be_bryan	0:b74591d5ab33	907
be_bryan	0:b74591d5ab33	908	MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse client hello v2" ) );
be_bryan	0:b74591d5ab33	909
be_bryan	0:b74591d5ab33	910	#if defined(MBEDTLS_SSL_RENEGOTIATION)
be_bryan	0:b74591d5ab33	911	if( ssl->renego_status != MBEDTLS_SSL_INITIAL_HANDSHAKE )
be_bryan	0:b74591d5ab33	912	{
be_bryan	0:b74591d5ab33	913	MBEDTLS_SSL_DEBUG_MSG( 1, ( "client hello v2 illegal for renegotiation" ) );
be_bryan	0:b74591d5ab33	914	mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
be_bryan	0:b74591d5ab33	915	MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE );
be_bryan	0:b74591d5ab33	916	return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
be_bryan	0:b74591d5ab33	917	}
be_bryan	0:b74591d5ab33	918	#endif /* MBEDTLS_SSL_RENEGOTIATION */
be_bryan	0:b74591d5ab33	919
be_bryan	0:b74591d5ab33	920	buf = ssl->in_hdr;
be_bryan	0:b74591d5ab33	921
be_bryan	0:b74591d5ab33	922	MBEDTLS_SSL_DEBUG_BUF( 4, "record header", buf, 5 );
be_bryan	0:b74591d5ab33	923
be_bryan	0:b74591d5ab33	924	MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello v2, message type: %d",
be_bryan	0:b74591d5ab33	925	buf[2] ) );
be_bryan	0:b74591d5ab33	926	MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello v2, message len.: %d",
be_bryan	0:b74591d5ab33	927	( ( buf[0] & 0x7F ) << 8 ) \| buf[1] ) );
be_bryan	0:b74591d5ab33	928	MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello v2, max. version: [%d:%d]",
be_bryan	0:b74591d5ab33	929	buf[3], buf[4] ) );
be_bryan	0:b74591d5ab33	930
be_bryan	0:b74591d5ab33	931	/*
be_bryan	0:b74591d5ab33	932	* SSLv2 Client Hello
be_bryan	0:b74591d5ab33	933	*
be_bryan	0:b74591d5ab33	934	* Record layer:
be_bryan	0:b74591d5ab33	935	* 0 . 1 message length
be_bryan	0:b74591d5ab33	936	*
be_bryan	0:b74591d5ab33	937	* SSL layer:
be_bryan	0:b74591d5ab33	938	* 2 . 2 message type
be_bryan	0:b74591d5ab33	939	* 3 . 4 protocol version
be_bryan	0:b74591d5ab33	940	*/
be_bryan	0:b74591d5ab33	941	if( buf[2] != MBEDTLS_SSL_HS_CLIENT_HELLO \|\|
be_bryan	0:b74591d5ab33	942	buf[3] != MBEDTLS_SSL_MAJOR_VERSION_3 )
be_bryan	0:b74591d5ab33	943	{
be_bryan	0:b74591d5ab33	944	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
be_bryan	0:b74591d5ab33	945	return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
be_bryan	0:b74591d5ab33	946	}
be_bryan	0:b74591d5ab33	947
be_bryan	0:b74591d5ab33	948	n = ( ( buf[0] << 8 ) \| buf[1] ) & 0x7FFF;
be_bryan	0:b74591d5ab33	949
be_bryan	0:b74591d5ab33	950	if( n < 17 \|\| n > 512 )
be_bryan	0:b74591d5ab33	951	{
be_bryan	0:b74591d5ab33	952	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
be_bryan	0:b74591d5ab33	953	return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
be_bryan	0:b74591d5ab33	954	}
be_bryan	0:b74591d5ab33	955
be_bryan	0:b74591d5ab33	956	ssl->major_ver = MBEDTLS_SSL_MAJOR_VERSION_3;
be_bryan	0:b74591d5ab33	957	ssl->minor_ver = ( buf[4] <= ssl->conf->max_minor_ver )
be_bryan	0:b74591d5ab33	958	? buf[4] : ssl->conf->max_minor_ver;
be_bryan	0:b74591d5ab33	959
be_bryan	0:b74591d5ab33	960	if( ssl->minor_ver < ssl->conf->min_minor_ver )
be_bryan	0:b74591d5ab33	961	{
be_bryan	0:b74591d5ab33	962	MBEDTLS_SSL_DEBUG_MSG( 1, ( "client only supports ssl smaller than minimum"
be_bryan	0:b74591d5ab33	963	" [%d:%d] < [%d:%d]",
be_bryan	0:b74591d5ab33	964	ssl->major_ver, ssl->minor_ver,
be_bryan	0:b74591d5ab33	965	ssl->conf->min_major_ver, ssl->conf->min_minor_ver ) );
be_bryan	0:b74591d5ab33	966
be_bryan	0:b74591d5ab33	967	mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
be_bryan	0:b74591d5ab33	968	MBEDTLS_SSL_ALERT_MSG_PROTOCOL_VERSION );
be_bryan	0:b74591d5ab33	969	return( MBEDTLS_ERR_SSL_BAD_HS_PROTOCOL_VERSION );
be_bryan	0:b74591d5ab33	970	}
be_bryan	0:b74591d5ab33	971
be_bryan	0:b74591d5ab33	972	ssl->handshake->max_major_ver = buf[3];
be_bryan	0:b74591d5ab33	973	ssl->handshake->max_minor_ver = buf[4];
be_bryan	0:b74591d5ab33	974
be_bryan	0:b74591d5ab33	975	if( ( ret = mbedtls_ssl_fetch_input( ssl, 2 + n ) ) != 0 )
be_bryan	0:b74591d5ab33	976	{
be_bryan	0:b74591d5ab33	977	MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_fetch_input", ret );
be_bryan	0:b74591d5ab33	978	return( ret );
be_bryan	0:b74591d5ab33	979	}
be_bryan	0:b74591d5ab33	980
be_bryan	0:b74591d5ab33	981	ssl->handshake->update_checksum( ssl, buf + 2, n );
be_bryan	0:b74591d5ab33	982
be_bryan	0:b74591d5ab33	983	buf = ssl->in_msg;
be_bryan	0:b74591d5ab33	984	n = ssl->in_left - 5;
be_bryan	0:b74591d5ab33	985
be_bryan	0:b74591d5ab33	986	/*
be_bryan	0:b74591d5ab33	987	* 0 . 1 ciphersuitelist length
be_bryan	0:b74591d5ab33	988	* 2 . 3 session id length
be_bryan	0:b74591d5ab33	989	* 4 . 5 challenge length
be_bryan	0:b74591d5ab33	990	* 6 . .. ciphersuitelist
be_bryan	0:b74591d5ab33	991	* .. . .. session id
be_bryan	0:b74591d5ab33	992	* .. . .. challenge
be_bryan	0:b74591d5ab33	993	*/
be_bryan	0:b74591d5ab33	994	MBEDTLS_SSL_DEBUG_BUF( 4, "record contents", buf, n );
be_bryan	0:b74591d5ab33	995
be_bryan	0:b74591d5ab33	996	ciph_len = ( buf[0] << 8 ) \| buf[1];
be_bryan	0:b74591d5ab33	997	sess_len = ( buf[2] << 8 ) \| buf[3];
be_bryan	0:b74591d5ab33	998	chal_len = ( buf[4] << 8 ) \| buf[5];
be_bryan	0:b74591d5ab33	999
be_bryan	0:b74591d5ab33	1000	MBEDTLS_SSL_DEBUG_MSG( 3, ( "ciph_len: %d, sess_len: %d, chal_len: %d",
be_bryan	0:b74591d5ab33	1001	ciph_len, sess_len, chal_len ) );
be_bryan	0:b74591d5ab33	1002
be_bryan	0:b74591d5ab33	1003	/*
be_bryan	0:b74591d5ab33	1004	* Make sure each parameter length is valid
be_bryan	0:b74591d5ab33	1005	*/
be_bryan	0:b74591d5ab33	1006	if( ciph_len < 3 \|\| ( ciph_len % 3 ) != 0 )
be_bryan	0:b74591d5ab33	1007	{
be_bryan	0:b74591d5ab33	1008	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
be_bryan	0:b74591d5ab33	1009	return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
be_bryan	0:b74591d5ab33	1010	}
be_bryan	0:b74591d5ab33	1011
be_bryan	0:b74591d5ab33	1012	if( sess_len > 32 )
be_bryan	0:b74591d5ab33	1013	{
be_bryan	0:b74591d5ab33	1014	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
be_bryan	0:b74591d5ab33	1015	return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
be_bryan	0:b74591d5ab33	1016	}
be_bryan	0:b74591d5ab33	1017
be_bryan	0:b74591d5ab33	1018	if( chal_len < 8 \|\| chal_len > 32 )
be_bryan	0:b74591d5ab33	1019	{
be_bryan	0:b74591d5ab33	1020	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
be_bryan	0:b74591d5ab33	1021	return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
be_bryan	0:b74591d5ab33	1022	}
be_bryan	0:b74591d5ab33	1023
be_bryan	0:b74591d5ab33	1024	if( n != 6 + ciph_len + sess_len + chal_len )
be_bryan	0:b74591d5ab33	1025	{
be_bryan	0:b74591d5ab33	1026	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
be_bryan	0:b74591d5ab33	1027	return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
be_bryan	0:b74591d5ab33	1028	}
be_bryan	0:b74591d5ab33	1029
be_bryan	0:b74591d5ab33	1030	MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, ciphersuitelist",
be_bryan	0:b74591d5ab33	1031	buf + 6, ciph_len );
be_bryan	0:b74591d5ab33	1032	MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, session id",
be_bryan	0:b74591d5ab33	1033	buf + 6 + ciph_len, sess_len );
be_bryan	0:b74591d5ab33	1034	MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, challenge",
be_bryan	0:b74591d5ab33	1035	buf + 6 + ciph_len + sess_len, chal_len );
be_bryan	0:b74591d5ab33	1036
be_bryan	0:b74591d5ab33	1037	p = buf + 6 + ciph_len;
be_bryan	0:b74591d5ab33	1038	ssl->session_negotiate->id_len = sess_len;
be_bryan	0:b74591d5ab33	1039	memset( ssl->session_negotiate->id, 0,
be_bryan	0:b74591d5ab33	1040	sizeof( ssl->session_negotiate->id ) );
be_bryan	0:b74591d5ab33	1041	memcpy( ssl->session_negotiate->id, p, ssl->session_negotiate->id_len );
be_bryan	0:b74591d5ab33	1042
be_bryan	0:b74591d5ab33	1043	p += sess_len;
be_bryan	0:b74591d5ab33	1044	memset( ssl->handshake->randbytes, 0, 64 );
be_bryan	0:b74591d5ab33	1045	memcpy( ssl->handshake->randbytes + 32 - chal_len, p, chal_len );
be_bryan	0:b74591d5ab33	1046
be_bryan	0:b74591d5ab33	1047	/*
be_bryan	0:b74591d5ab33	1048	* Check for TLS_EMPTY_RENEGOTIATION_INFO_SCSV
be_bryan	0:b74591d5ab33	1049	*/
be_bryan	0:b74591d5ab33	1050	for( i = 0, p = buf + 6; i < ciph_len; i += 3, p += 3 )
be_bryan	0:b74591d5ab33	1051	{
be_bryan	0:b74591d5ab33	1052	if( p[0] == 0 && p[1] == 0 && p[2] == MBEDTLS_SSL_EMPTY_RENEGOTIATION_INFO )
be_bryan	0:b74591d5ab33	1053	{
be_bryan	0:b74591d5ab33	1054	MBEDTLS_SSL_DEBUG_MSG( 3, ( "received TLS_EMPTY_RENEGOTIATION_INFO " ) );
be_bryan	0:b74591d5ab33	1055	#if defined(MBEDTLS_SSL_RENEGOTIATION)
be_bryan	0:b74591d5ab33	1056	if( ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS )
be_bryan	0:b74591d5ab33	1057	{
be_bryan	0:b74591d5ab33	1058	MBEDTLS_SSL_DEBUG_MSG( 1, ( "received RENEGOTIATION SCSV "
be_bryan	0:b74591d5ab33	1059	"during renegotiation" ) );
be_bryan	0:b74591d5ab33	1060
be_bryan	0:b74591d5ab33	1061	mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
be_bryan	0:b74591d5ab33	1062	MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE );
be_bryan	0:b74591d5ab33	1063	return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
be_bryan	0:b74591d5ab33	1064	}
be_bryan	0:b74591d5ab33	1065	#endif /* MBEDTLS_SSL_RENEGOTIATION */
be_bryan	0:b74591d5ab33	1066	ssl->secure_renegotiation = MBEDTLS_SSL_SECURE_RENEGOTIATION;
be_bryan	0:b74591d5ab33	1067	break;
be_bryan	0:b74591d5ab33	1068	}
be_bryan	0:b74591d5ab33	1069	}
be_bryan	0:b74591d5ab33	1070
be_bryan	0:b74591d5ab33	1071	#if defined(MBEDTLS_SSL_FALLBACK_SCSV)
be_bryan	0:b74591d5ab33	1072	for( i = 0, p = buf + 6; i < ciph_len; i += 3, p += 3 )
be_bryan	0:b74591d5ab33	1073	{
be_bryan	0:b74591d5ab33	1074	if( p[0] == 0 &&
be_bryan	0:b74591d5ab33	1075	p[1] == (unsigned char)( ( MBEDTLS_SSL_FALLBACK_SCSV_VALUE >> 8 ) & 0xff ) &&
be_bryan	0:b74591d5ab33	1076	p[2] == (unsigned char)( ( MBEDTLS_SSL_FALLBACK_SCSV_VALUE ) & 0xff ) )
be_bryan	0:b74591d5ab33	1077	{
be_bryan	0:b74591d5ab33	1078	MBEDTLS_SSL_DEBUG_MSG( 3, ( "received FALLBACK_SCSV" ) );
be_bryan	0:b74591d5ab33	1079
be_bryan	0:b74591d5ab33	1080	if( ssl->minor_ver < ssl->conf->max_minor_ver )
be_bryan	0:b74591d5ab33	1081	{
be_bryan	0:b74591d5ab33	1082	MBEDTLS_SSL_DEBUG_MSG( 1, ( "inapropriate fallback" ) );
be_bryan	0:b74591d5ab33	1083
be_bryan	0:b74591d5ab33	1084	mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
be_bryan	0:b74591d5ab33	1085	MBEDTLS_SSL_ALERT_MSG_INAPROPRIATE_FALLBACK );
be_bryan	0:b74591d5ab33	1086
be_bryan	0:b74591d5ab33	1087	return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
be_bryan	0:b74591d5ab33	1088	}
be_bryan	0:b74591d5ab33	1089
be_bryan	0:b74591d5ab33	1090	break;
be_bryan	0:b74591d5ab33	1091	}
be_bryan	0:b74591d5ab33	1092	}
be_bryan	0:b74591d5ab33	1093	#endif /* MBEDTLS_SSL_FALLBACK_SCSV */
be_bryan	0:b74591d5ab33	1094
be_bryan	0:b74591d5ab33	1095	got_common_suite = 0;
be_bryan	0:b74591d5ab33	1096	ciphersuites = ssl->conf->ciphersuite_list[ssl->minor_ver];
be_bryan	0:b74591d5ab33	1097	ciphersuite_info = NULL;
be_bryan	0:b74591d5ab33	1098	#if defined(MBEDTLS_SSL_SRV_RESPECT_CLIENT_PREFERENCE)
be_bryan	0:b74591d5ab33	1099	for( j = 0, p = buf + 6; j < ciph_len; j += 3, p += 3 )
be_bryan	0:b74591d5ab33	1100	for( i = 0; ciphersuites[i] != 0; i++ )
be_bryan	0:b74591d5ab33	1101	#else
be_bryan	0:b74591d5ab33	1102	for( i = 0; ciphersuites[i] != 0; i++ )
be_bryan	0:b74591d5ab33	1103	for( j = 0, p = buf + 6; j < ciph_len; j += 3, p += 3 )
be_bryan	0:b74591d5ab33	1104	#endif
be_bryan	0:b74591d5ab33	1105	{
be_bryan	0:b74591d5ab33	1106	if( p[0] != 0 \|\|
be_bryan	0:b74591d5ab33	1107	p[1] != ( ( ciphersuites[i] >> 8 ) & 0xFF ) \|\|
be_bryan	0:b74591d5ab33	1108	p[2] != ( ( ciphersuites[i] ) & 0xFF ) )
be_bryan	0:b74591d5ab33	1109	continue;
be_bryan	0:b74591d5ab33	1110
be_bryan	0:b74591d5ab33	1111	got_common_suite = 1;
be_bryan	0:b74591d5ab33	1112
be_bryan	0:b74591d5ab33	1113	if( ( ret = ssl_ciphersuite_match( ssl, ciphersuites[i],
be_bryan	0:b74591d5ab33	1114	&ciphersuite_info ) ) != 0 )
be_bryan	0:b74591d5ab33	1115	return( ret );
be_bryan	0:b74591d5ab33	1116
be_bryan	0:b74591d5ab33	1117	if( ciphersuite_info != NULL )
be_bryan	0:b74591d5ab33	1118	goto have_ciphersuite_v2;
be_bryan	0:b74591d5ab33	1119	}
be_bryan	0:b74591d5ab33	1120
be_bryan	0:b74591d5ab33	1121	if( got_common_suite )
be_bryan	0:b74591d5ab33	1122	{
be_bryan	0:b74591d5ab33	1123	MBEDTLS_SSL_DEBUG_MSG( 1, ( "got ciphersuites in common, "
be_bryan	0:b74591d5ab33	1124	"but none of them usable" ) );
be_bryan	0:b74591d5ab33	1125	return( MBEDTLS_ERR_SSL_NO_USABLE_CIPHERSUITE );
be_bryan	0:b74591d5ab33	1126	}
be_bryan	0:b74591d5ab33	1127	else
be_bryan	0:b74591d5ab33	1128	{
be_bryan	0:b74591d5ab33	1129	MBEDTLS_SSL_DEBUG_MSG( 1, ( "got no ciphersuites in common" ) );
be_bryan	0:b74591d5ab33	1130	return( MBEDTLS_ERR_SSL_NO_CIPHER_CHOSEN );
be_bryan	0:b74591d5ab33	1131	}
be_bryan	0:b74591d5ab33	1132
be_bryan	0:b74591d5ab33	1133	have_ciphersuite_v2:
be_bryan	0:b74591d5ab33	1134	MBEDTLS_SSL_DEBUG_MSG( 2, ( "selected ciphersuite: %s", ciphersuite_info->name ) );
be_bryan	0:b74591d5ab33	1135
be_bryan	0:b74591d5ab33	1136	ssl->session_negotiate->ciphersuite = ciphersuites[i];
be_bryan	0:b74591d5ab33	1137	ssl->transform_negotiate->ciphersuite_info = ciphersuite_info;
be_bryan	0:b74591d5ab33	1138
be_bryan	0:b74591d5ab33	1139	/*
be_bryan	0:b74591d5ab33	1140	* SSLv2 Client Hello relevant renegotiation security checks
be_bryan	0:b74591d5ab33	1141	*/
be_bryan	0:b74591d5ab33	1142	if( ssl->secure_renegotiation == MBEDTLS_SSL_LEGACY_RENEGOTIATION &&
be_bryan	0:b74591d5ab33	1143	ssl->conf->allow_legacy_renegotiation == MBEDTLS_SSL_LEGACY_BREAK_HANDSHAKE )
be_bryan	0:b74591d5ab33	1144	{
be_bryan	0:b74591d5ab33	1145	MBEDTLS_SSL_DEBUG_MSG( 1, ( "legacy renegotiation, breaking off handshake" ) );
be_bryan	0:b74591d5ab33	1146	mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
be_bryan	0:b74591d5ab33	1147	MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE );
be_bryan	0:b74591d5ab33	1148	return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
be_bryan	0:b74591d5ab33	1149	}
be_bryan	0:b74591d5ab33	1150
be_bryan	0:b74591d5ab33	1151	ssl->in_left = 0;
be_bryan	0:b74591d5ab33	1152	ssl->state++;
be_bryan	0:b74591d5ab33	1153
be_bryan	0:b74591d5ab33	1154	MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse client hello v2" ) );
be_bryan	0:b74591d5ab33	1155
be_bryan	0:b74591d5ab33	1156	return( 0 );
be_bryan	0:b74591d5ab33	1157	}
be_bryan	0:b74591d5ab33	1158	#endif /* MBEDTLS_SSL_SRV_SUPPORT_SSLV2_CLIENT_HELLO */
be_bryan	0:b74591d5ab33	1159
be_bryan	0:b74591d5ab33	1160	/* This function doesn't alert on errors that happen early during
be_bryan	0:b74591d5ab33	1161	ClientHello parsing because they might indicate that the client is
be_bryan	0:b74591d5ab33	1162	not talking SSL/TLS at all and would not understand our alert. */
be_bryan	0:b74591d5ab33	1163	static int ssl_parse_client_hello( mbedtls_ssl_context *ssl )
be_bryan	0:b74591d5ab33	1164	{
be_bryan	0:b74591d5ab33	1165	int ret, got_common_suite;
be_bryan	0:b74591d5ab33	1166	size_t i, j;
be_bryan	0:b74591d5ab33	1167	size_t ciph_offset, comp_offset, ext_offset;
be_bryan	0:b74591d5ab33	1168	size_t msg_len, ciph_len, sess_len, comp_len, ext_len;
be_bryan	0:b74591d5ab33	1169	#if defined(MBEDTLS_SSL_PROTO_DTLS)
be_bryan	0:b74591d5ab33	1170	size_t cookie_offset, cookie_len;
be_bryan	0:b74591d5ab33	1171	#endif
be_bryan	0:b74591d5ab33	1172	unsigned char buf, p, *ext;
be_bryan	0:b74591d5ab33	1173	#if defined(MBEDTLS_SSL_RENEGOTIATION)
be_bryan	0:b74591d5ab33	1174	int renegotiation_info_seen = 0;
be_bryan	0:b74591d5ab33	1175	#endif
be_bryan	0:b74591d5ab33	1176	int handshake_failure = 0;
be_bryan	0:b74591d5ab33	1177	const int *ciphersuites;
be_bryan	0:b74591d5ab33	1178	const mbedtls_ssl_ciphersuite_t *ciphersuite_info;
be_bryan	0:b74591d5ab33	1179	int major, minor;
be_bryan	0:b74591d5ab33	1180
be_bryan	0:b74591d5ab33	1181	/* If there is no signature-algorithm extension present,
be_bryan	0:b74591d5ab33	1182	* we need to fall back to the default values for allowed
be_bryan	0:b74591d5ab33	1183	* signature-hash pairs. */
be_bryan	0:b74591d5ab33	1184	#if defined(MBEDTLS_SSL_PROTO_TLS1_2) && \
be_bryan	0:b74591d5ab33	1185	defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED)
be_bryan	0:b74591d5ab33	1186	int sig_hash_alg_ext_present = 0;
be_bryan	0:b74591d5ab33	1187	#endif /* MBEDTLS_SSL_PROTO_TLS1_2 &&
be_bryan	0:b74591d5ab33	1188	MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED */
be_bryan	0:b74591d5ab33	1189
be_bryan	0:b74591d5ab33	1190	MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse client hello" ) );
be_bryan	0:b74591d5ab33	1191
be_bryan	0:b74591d5ab33	1192	#if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY)
be_bryan	0:b74591d5ab33	1193	read_record_header:
be_bryan	0:b74591d5ab33	1194	#endif
be_bryan	0:b74591d5ab33	1195	/*
be_bryan	0:b74591d5ab33	1196	* If renegotiating, then the input was read with mbedtls_ssl_read_record(),
be_bryan	0:b74591d5ab33	1197	* otherwise read it ourselves manually in order to support SSLv2
be_bryan	0:b74591d5ab33	1198	* ClientHello, which doesn't use the same record layer format.
be_bryan	0:b74591d5ab33	1199	*/
be_bryan	0:b74591d5ab33	1200	#if defined(MBEDTLS_SSL_RENEGOTIATION)
be_bryan	0:b74591d5ab33	1201	if( ssl->renego_status == MBEDTLS_SSL_INITIAL_HANDSHAKE )
be_bryan	0:b74591d5ab33	1202	#endif
be_bryan	0:b74591d5ab33	1203	{
be_bryan	0:b74591d5ab33	1204	if( ( ret = mbedtls_ssl_fetch_input( ssl, 5 ) ) != 0 )
be_bryan	0:b74591d5ab33	1205	{
be_bryan	0:b74591d5ab33	1206	/* No alert on a read error. */
be_bryan	0:b74591d5ab33	1207	MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_fetch_input", ret );
be_bryan	0:b74591d5ab33	1208	return( ret );
be_bryan	0:b74591d5ab33	1209	}
be_bryan	0:b74591d5ab33	1210	}
be_bryan	0:b74591d5ab33	1211
be_bryan	0:b74591d5ab33	1212	buf = ssl->in_hdr;
be_bryan	0:b74591d5ab33	1213
be_bryan	0:b74591d5ab33	1214	#if defined(MBEDTLS_SSL_SRV_SUPPORT_SSLV2_CLIENT_HELLO)
be_bryan	0:b74591d5ab33	1215	#if defined(MBEDTLS_SSL_PROTO_DTLS)
be_bryan	0:b74591d5ab33	1216	if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_STREAM )
be_bryan	0:b74591d5ab33	1217	#endif
be_bryan	0:b74591d5ab33	1218	if( ( buf[0] & 0x80 ) != 0 )
be_bryan	0:b74591d5ab33	1219	return( ssl_parse_client_hello_v2( ssl ) );
be_bryan	0:b74591d5ab33	1220	#endif
be_bryan	0:b74591d5ab33	1221
be_bryan	0:b74591d5ab33	1222	MBEDTLS_SSL_DEBUG_BUF( 4, "record header", buf, mbedtls_ssl_hdr_len( ssl ) );
be_bryan	0:b74591d5ab33	1223
be_bryan	0:b74591d5ab33	1224	/*
be_bryan	0:b74591d5ab33	1225	* SSLv3/TLS Client Hello
be_bryan	0:b74591d5ab33	1226	*
be_bryan	0:b74591d5ab33	1227	* Record layer:
be_bryan	0:b74591d5ab33	1228	* 0 . 0 message type
be_bryan	0:b74591d5ab33	1229	* 1 . 2 protocol version
be_bryan	0:b74591d5ab33	1230	* 3 . 11 DTLS: epoch + record sequence number
be_bryan	0:b74591d5ab33	1231	* 3 . 4 message length
be_bryan	0:b74591d5ab33	1232	*/
be_bryan	0:b74591d5ab33	1233	MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello v3, message type: %d",
be_bryan	0:b74591d5ab33	1234	buf[0] ) );
be_bryan	0:b74591d5ab33	1235
be_bryan	0:b74591d5ab33	1236	if( buf[0] != MBEDTLS_SSL_MSG_HANDSHAKE )
be_bryan	0:b74591d5ab33	1237	{
be_bryan	0:b74591d5ab33	1238	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
be_bryan	0:b74591d5ab33	1239	return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
be_bryan	0:b74591d5ab33	1240	}
be_bryan	0:b74591d5ab33	1241
be_bryan	0:b74591d5ab33	1242	MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello v3, message len.: %d",
be_bryan	0:b74591d5ab33	1243	( ssl->in_len[0] << 8 ) \| ssl->in_len[1] ) );
be_bryan	0:b74591d5ab33	1244
be_bryan	0:b74591d5ab33	1245	MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello v3, protocol version: [%d:%d]",
be_bryan	0:b74591d5ab33	1246	buf[1], buf[2] ) );
be_bryan	0:b74591d5ab33	1247
be_bryan	0:b74591d5ab33	1248	mbedtls_ssl_read_version( &major, &minor, ssl->conf->transport, buf + 1 );
be_bryan	0:b74591d5ab33	1249
be_bryan	0:b74591d5ab33	1250	/* According to RFC 5246 Appendix E.1, the version here is typically
be_bryan	0:b74591d5ab33	1251	* "{03,00}, the lowest version number supported by the client, [or] the
be_bryan	0:b74591d5ab33	1252	* value of ClientHello.client_version", so the only meaningful check here
be_bryan	0:b74591d5ab33	1253	* is the major version shouldn't be less than 3 */
be_bryan	0:b74591d5ab33	1254	if( major < MBEDTLS_SSL_MAJOR_VERSION_3 )
be_bryan	0:b74591d5ab33	1255	{
be_bryan	0:b74591d5ab33	1256	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
be_bryan	0:b74591d5ab33	1257	return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
be_bryan	0:b74591d5ab33	1258	}
be_bryan	0:b74591d5ab33	1259
be_bryan	0:b74591d5ab33	1260	/* For DTLS if this is the initial handshake, remember the client sequence
be_bryan	0:b74591d5ab33	1261	* number to use it in our next message (RFC 6347 4.2.1) */
be_bryan	0:b74591d5ab33	1262	#if defined(MBEDTLS_SSL_PROTO_DTLS)
be_bryan	0:b74591d5ab33	1263	if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM
be_bryan	0:b74591d5ab33	1264	#if defined(MBEDTLS_SSL_RENEGOTIATION)
be_bryan	0:b74591d5ab33	1265	&& ssl->renego_status == MBEDTLS_SSL_INITIAL_HANDSHAKE
be_bryan	0:b74591d5ab33	1266	#endif
be_bryan	0:b74591d5ab33	1267	)
be_bryan	0:b74591d5ab33	1268	{
be_bryan	0:b74591d5ab33	1269	/* Epoch should be 0 for initial handshakes */
be_bryan	0:b74591d5ab33	1270	if( ssl->in_ctr[0] != 0 \|\| ssl->in_ctr[1] != 0 )
be_bryan	0:b74591d5ab33	1271	{
be_bryan	0:b74591d5ab33	1272	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
be_bryan	0:b74591d5ab33	1273	return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
be_bryan	0:b74591d5ab33	1274	}
be_bryan	0:b74591d5ab33	1275
be_bryan	0:b74591d5ab33	1276	memcpy( ssl->out_ctr + 2, ssl->in_ctr + 2, 6 );
be_bryan	0:b74591d5ab33	1277
be_bryan	0:b74591d5ab33	1278	#if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY)
be_bryan	0:b74591d5ab33	1279	if( mbedtls_ssl_dtls_replay_check( ssl ) != 0 )
be_bryan	0:b74591d5ab33	1280	{
be_bryan	0:b74591d5ab33	1281	MBEDTLS_SSL_DEBUG_MSG( 1, ( "replayed record, discarding" ) );
be_bryan	0:b74591d5ab33	1282	ssl->next_record_offset = 0;
be_bryan	0:b74591d5ab33	1283	ssl->in_left = 0;
be_bryan	0:b74591d5ab33	1284	goto read_record_header;
be_bryan	0:b74591d5ab33	1285	}
be_bryan	0:b74591d5ab33	1286
be_bryan	0:b74591d5ab33	1287	/* No MAC to check yet, so we can update right now */
be_bryan	0:b74591d5ab33	1288	mbedtls_ssl_dtls_replay_update( ssl );
be_bryan	0:b74591d5ab33	1289	#endif
be_bryan	0:b74591d5ab33	1290	}
be_bryan	0:b74591d5ab33	1291	#endif /* MBEDTLS_SSL_PROTO_DTLS */
be_bryan	0:b74591d5ab33	1292
be_bryan	0:b74591d5ab33	1293	msg_len = ( ssl->in_len[0] << 8 ) \| ssl->in_len[1];
be_bryan	0:b74591d5ab33	1294
be_bryan	0:b74591d5ab33	1295	#if defined(MBEDTLS_SSL_RENEGOTIATION)
be_bryan	0:b74591d5ab33	1296	if( ssl->renego_status != MBEDTLS_SSL_INITIAL_HANDSHAKE )
be_bryan	0:b74591d5ab33	1297	{
be_bryan	0:b74591d5ab33	1298	/* Set by mbedtls_ssl_read_record() */
be_bryan	0:b74591d5ab33	1299	msg_len = ssl->in_hslen;
be_bryan	0:b74591d5ab33	1300	}
be_bryan	0:b74591d5ab33	1301	else
be_bryan	0:b74591d5ab33	1302	#endif
be_bryan	0:b74591d5ab33	1303	{
be_bryan	0:b74591d5ab33	1304	if( msg_len > MBEDTLS_SSL_MAX_CONTENT_LEN )
be_bryan	0:b74591d5ab33	1305	{
be_bryan	0:b74591d5ab33	1306	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
be_bryan	0:b74591d5ab33	1307	return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
be_bryan	0:b74591d5ab33	1308	}
be_bryan	0:b74591d5ab33	1309
be_bryan	0:b74591d5ab33	1310	if( ( ret = mbedtls_ssl_fetch_input( ssl,
be_bryan	0:b74591d5ab33	1311	mbedtls_ssl_hdr_len( ssl ) + msg_len ) ) != 0 )
be_bryan	0:b74591d5ab33	1312	{
be_bryan	0:b74591d5ab33	1313	MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_fetch_input", ret );
be_bryan	0:b74591d5ab33	1314	return( ret );
be_bryan	0:b74591d5ab33	1315	}
be_bryan	0:b74591d5ab33	1316
be_bryan	0:b74591d5ab33	1317	/* Done reading this record, get ready for the next one */
be_bryan	0:b74591d5ab33	1318	#if defined(MBEDTLS_SSL_PROTO_DTLS)
be_bryan	0:b74591d5ab33	1319	if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
be_bryan	0:b74591d5ab33	1320	ssl->next_record_offset = msg_len + mbedtls_ssl_hdr_len( ssl );
be_bryan	0:b74591d5ab33	1321	else
be_bryan	0:b74591d5ab33	1322	#endif
be_bryan	0:b74591d5ab33	1323	ssl->in_left = 0;
be_bryan	0:b74591d5ab33	1324	}
be_bryan	0:b74591d5ab33	1325
be_bryan	0:b74591d5ab33	1326	buf = ssl->in_msg;
be_bryan	0:b74591d5ab33	1327
be_bryan	0:b74591d5ab33	1328	MBEDTLS_SSL_DEBUG_BUF( 4, "record contents", buf, msg_len );
be_bryan	0:b74591d5ab33	1329
be_bryan	0:b74591d5ab33	1330	ssl->handshake->update_checksum( ssl, buf, msg_len );
be_bryan	0:b74591d5ab33	1331
be_bryan	0:b74591d5ab33	1332	/*
be_bryan	0:b74591d5ab33	1333	* Handshake layer:
be_bryan	0:b74591d5ab33	1334	* 0 . 0 handshake type
be_bryan	0:b74591d5ab33	1335	* 1 . 3 handshake length
be_bryan	0:b74591d5ab33	1336	* 4 . 5 DTLS only: message seqence number
be_bryan	0:b74591d5ab33	1337	* 6 . 8 DTLS only: fragment offset
be_bryan	0:b74591d5ab33	1338	* 9 . 11 DTLS only: fragment length
be_bryan	0:b74591d5ab33	1339	*/
be_bryan	0:b74591d5ab33	1340	if( msg_len < mbedtls_ssl_hs_hdr_len( ssl ) )
be_bryan	0:b74591d5ab33	1341	{
be_bryan	0:b74591d5ab33	1342	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
be_bryan	0:b74591d5ab33	1343	return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
be_bryan	0:b74591d5ab33	1344	}
be_bryan	0:b74591d5ab33	1345
be_bryan	0:b74591d5ab33	1346	MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello v3, handshake type: %d", buf[0] ) );
be_bryan	0:b74591d5ab33	1347
be_bryan	0:b74591d5ab33	1348	if( buf[0] != MBEDTLS_SSL_HS_CLIENT_HELLO )
be_bryan	0:b74591d5ab33	1349	{
be_bryan	0:b74591d5ab33	1350	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
be_bryan	0:b74591d5ab33	1351	return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
be_bryan	0:b74591d5ab33	1352	}
be_bryan	0:b74591d5ab33	1353
be_bryan	0:b74591d5ab33	1354	MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello v3, handshake len.: %d",
be_bryan	0:b74591d5ab33	1355	( buf[1] << 16 ) \| ( buf[2] << 8 ) \| buf[3] ) );
be_bryan	0:b74591d5ab33	1356
be_bryan	0:b74591d5ab33	1357	/* We don't support fragmentation of ClientHello (yet?) */
be_bryan	0:b74591d5ab33	1358	if( buf[1] != 0 \|\|
be_bryan	0:b74591d5ab33	1359	msg_len != mbedtls_ssl_hs_hdr_len( ssl ) + ( ( buf[2] << 8 ) \| buf[3] ) )
be_bryan	0:b74591d5ab33	1360	{
be_bryan	0:b74591d5ab33	1361	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
be_bryan	0:b74591d5ab33	1362	return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
be_bryan	0:b74591d5ab33	1363	}
be_bryan	0:b74591d5ab33	1364
be_bryan	0:b74591d5ab33	1365	#if defined(MBEDTLS_SSL_PROTO_DTLS)
be_bryan	0:b74591d5ab33	1366	if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
be_bryan	0:b74591d5ab33	1367	{
be_bryan	0:b74591d5ab33	1368	/*
be_bryan	0:b74591d5ab33	1369	* Copy the client's handshake message_seq on initial handshakes,
be_bryan	0:b74591d5ab33	1370	* check sequence number on renego.
be_bryan	0:b74591d5ab33	1371	*/
be_bryan	0:b74591d5ab33	1372	#if defined(MBEDTLS_SSL_RENEGOTIATION)
be_bryan	0:b74591d5ab33	1373	if( ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS )
be_bryan	0:b74591d5ab33	1374	{
be_bryan	0:b74591d5ab33	1375	/* This couldn't be done in ssl_prepare_handshake_record() */
be_bryan	0:b74591d5ab33	1376	unsigned int cli_msg_seq = ( ssl->in_msg[4] << 8 ) \|
be_bryan	0:b74591d5ab33	1377	ssl->in_msg[5];
be_bryan	0:b74591d5ab33	1378
be_bryan	0:b74591d5ab33	1379	if( cli_msg_seq != ssl->handshake->in_msg_seq )
be_bryan	0:b74591d5ab33	1380	{
be_bryan	0:b74591d5ab33	1381	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message_seq: "
be_bryan	0:b74591d5ab33	1382	"%d (expected %d)", cli_msg_seq,
be_bryan	0:b74591d5ab33	1383	ssl->handshake->in_msg_seq ) );
be_bryan	0:b74591d5ab33	1384	return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
be_bryan	0:b74591d5ab33	1385	}
be_bryan	0:b74591d5ab33	1386
be_bryan	0:b74591d5ab33	1387	ssl->handshake->in_msg_seq++;
be_bryan	0:b74591d5ab33	1388	}
be_bryan	0:b74591d5ab33	1389	else
be_bryan	0:b74591d5ab33	1390	#endif
be_bryan	0:b74591d5ab33	1391	{
be_bryan	0:b74591d5ab33	1392	unsigned int cli_msg_seq = ( ssl->in_msg[4] << 8 ) \|
be_bryan	0:b74591d5ab33	1393	ssl->in_msg[5];
be_bryan	0:b74591d5ab33	1394	ssl->handshake->out_msg_seq = cli_msg_seq;
be_bryan	0:b74591d5ab33	1395	ssl->handshake->in_msg_seq = cli_msg_seq + 1;
be_bryan	0:b74591d5ab33	1396	}
be_bryan	0:b74591d5ab33	1397
be_bryan	0:b74591d5ab33	1398	/*
be_bryan	0:b74591d5ab33	1399	* For now we don't support fragmentation, so make sure
be_bryan	0:b74591d5ab33	1400	* fragment_offset == 0 and fragment_length == length
be_bryan	0:b74591d5ab33	1401	*/
be_bryan	0:b74591d5ab33	1402	if( ssl->in_msg[6] != 0 \|\| ssl->in_msg[7] != 0 \|\| ssl->in_msg[8] != 0 \|\|
be_bryan	0:b74591d5ab33	1403	memcmp( ssl->in_msg + 1, ssl->in_msg + 9, 3 ) != 0 )
be_bryan	0:b74591d5ab33	1404	{
be_bryan	0:b74591d5ab33	1405	MBEDTLS_SSL_DEBUG_MSG( 1, ( "ClientHello fragmentation not supported" ) );
be_bryan	0:b74591d5ab33	1406	return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE );
be_bryan	0:b74591d5ab33	1407	}
be_bryan	0:b74591d5ab33	1408	}
be_bryan	0:b74591d5ab33	1409	#endif /* MBEDTLS_SSL_PROTO_DTLS */
be_bryan	0:b74591d5ab33	1410
be_bryan	0:b74591d5ab33	1411	buf += mbedtls_ssl_hs_hdr_len( ssl );
be_bryan	0:b74591d5ab33	1412	msg_len -= mbedtls_ssl_hs_hdr_len( ssl );
be_bryan	0:b74591d5ab33	1413
be_bryan	0:b74591d5ab33	1414	/*
be_bryan	0:b74591d5ab33	1415	* ClientHello layer:
be_bryan	0:b74591d5ab33	1416	* 0 . 1 protocol version
be_bryan	0:b74591d5ab33	1417	* 2 . 33 random bytes (starting with 4 bytes of Unix time)
be_bryan	0:b74591d5ab33	1418	* 34 . 35 session id length (1 byte)
be_bryan	0:b74591d5ab33	1419	* 35 . 34+x session id
be_bryan	0:b74591d5ab33	1420	* 35+x . 35+x DTLS only: cookie length (1 byte)
be_bryan	0:b74591d5ab33	1421	* 36+x . .. DTLS only: cookie
be_bryan	0:b74591d5ab33	1422	* .. . .. ciphersuite list length (2 bytes)
be_bryan	0:b74591d5ab33	1423	* .. . .. ciphersuite list
be_bryan	0:b74591d5ab33	1424	* .. . .. compression alg. list length (1 byte)
be_bryan	0:b74591d5ab33	1425	* .. . .. compression alg. list
be_bryan	0:b74591d5ab33	1426	* .. . .. extensions length (2 bytes, optional)
be_bryan	0:b74591d5ab33	1427	* .. . .. extensions (optional)
be_bryan	0:b74591d5ab33	1428	*/
be_bryan	0:b74591d5ab33	1429
be_bryan	0:b74591d5ab33	1430	/*
be_bryan	0:b74591d5ab33	1431	* Minimal length (with everything empty and extensions ommitted) is
be_bryan	0:b74591d5ab33	1432	* 2 + 32 + 1 + 2 + 1 = 38 bytes. Check that first, so that we can
be_bryan	0:b74591d5ab33	1433	* read at least up to session id length without worrying.
be_bryan	0:b74591d5ab33	1434	*/
be_bryan	0:b74591d5ab33	1435	if( msg_len < 38 )
be_bryan	0:b74591d5ab33	1436	{
be_bryan	0:b74591d5ab33	1437	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
be_bryan	0:b74591d5ab33	1438	return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
be_bryan	0:b74591d5ab33	1439	}
be_bryan	0:b74591d5ab33	1440
be_bryan	0:b74591d5ab33	1441	/*
be_bryan	0:b74591d5ab33	1442	* Check and save the protocol version
be_bryan	0:b74591d5ab33	1443	*/
be_bryan	0:b74591d5ab33	1444	MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, version", buf, 2 );
be_bryan	0:b74591d5ab33	1445
be_bryan	0:b74591d5ab33	1446	mbedtls_ssl_read_version( &ssl->major_ver, &ssl->minor_ver,
be_bryan	0:b74591d5ab33	1447	ssl->conf->transport, buf );
be_bryan	0:b74591d5ab33	1448
be_bryan	0:b74591d5ab33	1449	ssl->handshake->max_major_ver = ssl->major_ver;
be_bryan	0:b74591d5ab33	1450	ssl->handshake->max_minor_ver = ssl->minor_ver;
be_bryan	0:b74591d5ab33	1451
be_bryan	0:b74591d5ab33	1452	if( ssl->major_ver < ssl->conf->min_major_ver \|\|
be_bryan	0:b74591d5ab33	1453	ssl->minor_ver < ssl->conf->min_minor_ver )
be_bryan	0:b74591d5ab33	1454	{
be_bryan	0:b74591d5ab33	1455	MBEDTLS_SSL_DEBUG_MSG( 1, ( "client only supports ssl smaller than minimum"
be_bryan	0:b74591d5ab33	1456	" [%d:%d] < [%d:%d]",
be_bryan	0:b74591d5ab33	1457	ssl->major_ver, ssl->minor_ver,
be_bryan	0:b74591d5ab33	1458	ssl->conf->min_major_ver, ssl->conf->min_minor_ver ) );
be_bryan	0:b74591d5ab33	1459	mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
be_bryan	0:b74591d5ab33	1460	MBEDTLS_SSL_ALERT_MSG_PROTOCOL_VERSION );
be_bryan	0:b74591d5ab33	1461	return( MBEDTLS_ERR_SSL_BAD_HS_PROTOCOL_VERSION );
be_bryan	0:b74591d5ab33	1462	}
be_bryan	0:b74591d5ab33	1463
be_bryan	0:b74591d5ab33	1464	if( ssl->major_ver > ssl->conf->max_major_ver )
be_bryan	0:b74591d5ab33	1465	{
be_bryan	0:b74591d5ab33	1466	ssl->major_ver = ssl->conf->max_major_ver;
be_bryan	0:b74591d5ab33	1467	ssl->minor_ver = ssl->conf->max_minor_ver;
be_bryan	0:b74591d5ab33	1468	}
be_bryan	0:b74591d5ab33	1469	else if( ssl->minor_ver > ssl->conf->max_minor_ver )
be_bryan	0:b74591d5ab33	1470	ssl->minor_ver = ssl->conf->max_minor_ver;
be_bryan	0:b74591d5ab33	1471
be_bryan	0:b74591d5ab33	1472	/*
be_bryan	0:b74591d5ab33	1473	* Save client random (inc. Unix time)
be_bryan	0:b74591d5ab33	1474	*/
be_bryan	0:b74591d5ab33	1475	MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, random bytes", buf + 2, 32 );
be_bryan	0:b74591d5ab33	1476
be_bryan	0:b74591d5ab33	1477	memcpy( ssl->handshake->randbytes, buf + 2, 32 );
be_bryan	0:b74591d5ab33	1478
be_bryan	0:b74591d5ab33	1479	/*
be_bryan	0:b74591d5ab33	1480	* Check the session ID length and save session ID
be_bryan	0:b74591d5ab33	1481	*/
be_bryan	0:b74591d5ab33	1482	sess_len = buf[34];
be_bryan	0:b74591d5ab33	1483
be_bryan	0:b74591d5ab33	1484	if( sess_len > sizeof( ssl->session_negotiate->id ) \|\|
be_bryan	0:b74591d5ab33	1485	sess_len + 34 + 2 > msg_len ) /* 2 for cipherlist length field */
be_bryan	0:b74591d5ab33	1486	{
be_bryan	0:b74591d5ab33	1487	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
be_bryan	0:b74591d5ab33	1488	mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
be_bryan	0:b74591d5ab33	1489	MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
be_bryan	0:b74591d5ab33	1490	return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
be_bryan	0:b74591d5ab33	1491	}
be_bryan	0:b74591d5ab33	1492
be_bryan	0:b74591d5ab33	1493	MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, session id", buf + 35, sess_len );
be_bryan	0:b74591d5ab33	1494
be_bryan	0:b74591d5ab33	1495	ssl->session_negotiate->id_len = sess_len;
be_bryan	0:b74591d5ab33	1496	memset( ssl->session_negotiate->id, 0,
be_bryan	0:b74591d5ab33	1497	sizeof( ssl->session_negotiate->id ) );
be_bryan	0:b74591d5ab33	1498	memcpy( ssl->session_negotiate->id, buf + 35,
be_bryan	0:b74591d5ab33	1499	ssl->session_negotiate->id_len );
be_bryan	0:b74591d5ab33	1500
be_bryan	0:b74591d5ab33	1501	/*
be_bryan	0:b74591d5ab33	1502	* Check the cookie length and content
be_bryan	0:b74591d5ab33	1503	*/
be_bryan	0:b74591d5ab33	1504	#if defined(MBEDTLS_SSL_PROTO_DTLS)
be_bryan	0:b74591d5ab33	1505	if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
be_bryan	0:b74591d5ab33	1506	{
be_bryan	0:b74591d5ab33	1507	cookie_offset = 35 + sess_len;
be_bryan	0:b74591d5ab33	1508	cookie_len = buf[cookie_offset];
be_bryan	0:b74591d5ab33	1509
be_bryan	0:b74591d5ab33	1510	if( cookie_offset + 1 + cookie_len + 2 > msg_len )
be_bryan	0:b74591d5ab33	1511	{
be_bryan	0:b74591d5ab33	1512	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
be_bryan	0:b74591d5ab33	1513	mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
be_bryan	0:b74591d5ab33	1514	MBEDTLS_SSL_ALERT_MSG_PROTOCOL_VERSION );
be_bryan	0:b74591d5ab33	1515	return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
be_bryan	0:b74591d5ab33	1516	}
be_bryan	0:b74591d5ab33	1517
be_bryan	0:b74591d5ab33	1518	MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, cookie",
be_bryan	0:b74591d5ab33	1519	buf + cookie_offset + 1, cookie_len );
be_bryan	0:b74591d5ab33	1520
be_bryan	0:b74591d5ab33	1521	#if defined(MBEDTLS_SSL_DTLS_HELLO_VERIFY)
be_bryan	0:b74591d5ab33	1522	if( ssl->conf->f_cookie_check != NULL
be_bryan	0:b74591d5ab33	1523	#if defined(MBEDTLS_SSL_RENEGOTIATION)
be_bryan	0:b74591d5ab33	1524	&& ssl->renego_status == MBEDTLS_SSL_INITIAL_HANDSHAKE
be_bryan	0:b74591d5ab33	1525	#endif
be_bryan	0:b74591d5ab33	1526	)
be_bryan	0:b74591d5ab33	1527	{
be_bryan	0:b74591d5ab33	1528	if( ssl->conf->f_cookie_check( ssl->conf->p_cookie,
be_bryan	0:b74591d5ab33	1529	buf + cookie_offset + 1, cookie_len,
be_bryan	0:b74591d5ab33	1530	ssl->cli_id, ssl->cli_id_len ) != 0 )
be_bryan	0:b74591d5ab33	1531	{
be_bryan	0:b74591d5ab33	1532	MBEDTLS_SSL_DEBUG_MSG( 2, ( "cookie verification failed" ) );
be_bryan	0:b74591d5ab33	1533	ssl->handshake->verify_cookie_len = 1;
be_bryan	0:b74591d5ab33	1534	}
be_bryan	0:b74591d5ab33	1535	else
be_bryan	0:b74591d5ab33	1536	{
be_bryan	0:b74591d5ab33	1537	MBEDTLS_SSL_DEBUG_MSG( 2, ( "cookie verification passed" ) );
be_bryan	0:b74591d5ab33	1538	ssl->handshake->verify_cookie_len = 0;
be_bryan	0:b74591d5ab33	1539	}
be_bryan	0:b74591d5ab33	1540	}
be_bryan	0:b74591d5ab33	1541	else
be_bryan	0:b74591d5ab33	1542	#endif /* MBEDTLS_SSL_DTLS_HELLO_VERIFY */
be_bryan	0:b74591d5ab33	1543	{
be_bryan	0:b74591d5ab33	1544	/* We know we didn't send a cookie, so it should be empty */
be_bryan	0:b74591d5ab33	1545	if( cookie_len != 0 )
be_bryan	0:b74591d5ab33	1546	{
be_bryan	0:b74591d5ab33	1547	/* This may be an attacker's probe, so don't send an alert */
be_bryan	0:b74591d5ab33	1548	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
be_bryan	0:b74591d5ab33	1549	return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
be_bryan	0:b74591d5ab33	1550	}
be_bryan	0:b74591d5ab33	1551
be_bryan	0:b74591d5ab33	1552	MBEDTLS_SSL_DEBUG_MSG( 2, ( "cookie verification skipped" ) );
be_bryan	0:b74591d5ab33	1553	}
be_bryan	0:b74591d5ab33	1554
be_bryan	0:b74591d5ab33	1555	/*
be_bryan	0:b74591d5ab33	1556	* Check the ciphersuitelist length (will be parsed later)
be_bryan	0:b74591d5ab33	1557	*/
be_bryan	0:b74591d5ab33	1558	ciph_offset = cookie_offset + 1 + cookie_len;
be_bryan	0:b74591d5ab33	1559	}
be_bryan	0:b74591d5ab33	1560	else
be_bryan	0:b74591d5ab33	1561	#endif /* MBEDTLS_SSL_PROTO_DTLS */
be_bryan	0:b74591d5ab33	1562	ciph_offset = 35 + sess_len;
be_bryan	0:b74591d5ab33	1563
be_bryan	0:b74591d5ab33	1564	ciph_len = ( buf[ciph_offset + 0] << 8 )
be_bryan	0:b74591d5ab33	1565	\| ( buf[ciph_offset + 1] );
be_bryan	0:b74591d5ab33	1566
be_bryan	0:b74591d5ab33	1567	if( ciph_len < 2 \|\|
be_bryan	0:b74591d5ab33	1568	ciph_len + 2 + ciph_offset + 1 > msg_len \|\| /* 1 for comp. alg. len */
be_bryan	0:b74591d5ab33	1569	( ciph_len % 2 ) != 0 )
be_bryan	0:b74591d5ab33	1570	{
be_bryan	0:b74591d5ab33	1571	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
be_bryan	0:b74591d5ab33	1572	mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
be_bryan	0:b74591d5ab33	1573	MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
be_bryan	0:b74591d5ab33	1574	return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
be_bryan	0:b74591d5ab33	1575	}
be_bryan	0:b74591d5ab33	1576
be_bryan	0:b74591d5ab33	1577	MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, ciphersuitelist",
be_bryan	0:b74591d5ab33	1578	buf + ciph_offset + 2, ciph_len );
be_bryan	0:b74591d5ab33	1579
be_bryan	0:b74591d5ab33	1580	/*
be_bryan	0:b74591d5ab33	1581	* Check the compression algorithms length and pick one
be_bryan	0:b74591d5ab33	1582	*/
be_bryan	0:b74591d5ab33	1583	comp_offset = ciph_offset + 2 + ciph_len;
be_bryan	0:b74591d5ab33	1584
be_bryan	0:b74591d5ab33	1585	comp_len = buf[comp_offset];
be_bryan	0:b74591d5ab33	1586
be_bryan	0:b74591d5ab33	1587	if( comp_len < 1 \|\|
be_bryan	0:b74591d5ab33	1588	comp_len > 16 \|\|
be_bryan	0:b74591d5ab33	1589	comp_len + comp_offset + 1 > msg_len )
be_bryan	0:b74591d5ab33	1590	{
be_bryan	0:b74591d5ab33	1591	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
be_bryan	0:b74591d5ab33	1592	mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
be_bryan	0:b74591d5ab33	1593	MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
be_bryan	0:b74591d5ab33	1594	return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
be_bryan	0:b74591d5ab33	1595	}
be_bryan	0:b74591d5ab33	1596
be_bryan	0:b74591d5ab33	1597	MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, compression",
be_bryan	0:b74591d5ab33	1598	buf + comp_offset + 1, comp_len );
be_bryan	0:b74591d5ab33	1599
be_bryan	0:b74591d5ab33	1600	ssl->session_negotiate->compression = MBEDTLS_SSL_COMPRESS_NULL;
be_bryan	0:b74591d5ab33	1601	#if defined(MBEDTLS_ZLIB_SUPPORT)
be_bryan	0:b74591d5ab33	1602	for( i = 0; i < comp_len; ++i )
be_bryan	0:b74591d5ab33	1603	{
be_bryan	0:b74591d5ab33	1604	if( buf[comp_offset + 1 + i] == MBEDTLS_SSL_COMPRESS_DEFLATE )
be_bryan	0:b74591d5ab33	1605	{
be_bryan	0:b74591d5ab33	1606	ssl->session_negotiate->compression = MBEDTLS_SSL_COMPRESS_DEFLATE;
be_bryan	0:b74591d5ab33	1607	break;
be_bryan	0:b74591d5ab33	1608	}
be_bryan	0:b74591d5ab33	1609	}
be_bryan	0:b74591d5ab33	1610	#endif
be_bryan	0:b74591d5ab33	1611
be_bryan	0:b74591d5ab33	1612	/* See comments in ssl_write_client_hello() */
be_bryan	0:b74591d5ab33	1613	#if defined(MBEDTLS_SSL_PROTO_DTLS)
be_bryan	0:b74591d5ab33	1614	if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
be_bryan	0:b74591d5ab33	1615	ssl->session_negotiate->compression = MBEDTLS_SSL_COMPRESS_NULL;
be_bryan	0:b74591d5ab33	1616	#endif
be_bryan	0:b74591d5ab33	1617
be_bryan	0:b74591d5ab33	1618	/* Do not parse the extensions if the protocol is SSLv3 */
be_bryan	0:b74591d5ab33	1619	#if defined(MBEDTLS_SSL_PROTO_SSL3)
be_bryan	0:b74591d5ab33	1620	if( ( ssl->major_ver != 3 ) \|\| ( ssl->minor_ver != 0 ) )
be_bryan	0:b74591d5ab33	1621	{
be_bryan	0:b74591d5ab33	1622	#endif
be_bryan	0:b74591d5ab33	1623	/*
be_bryan	0:b74591d5ab33	1624	* Check the extension length
be_bryan	0:b74591d5ab33	1625	*/
be_bryan	0:b74591d5ab33	1626	ext_offset = comp_offset + 1 + comp_len;
be_bryan	0:b74591d5ab33	1627	if( msg_len > ext_offset )
be_bryan	0:b74591d5ab33	1628	{
be_bryan	0:b74591d5ab33	1629	if( msg_len < ext_offset + 2 )
be_bryan	0:b74591d5ab33	1630	{
be_bryan	0:b74591d5ab33	1631	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
be_bryan	0:b74591d5ab33	1632	mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
be_bryan	0:b74591d5ab33	1633	MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
be_bryan	0:b74591d5ab33	1634	return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
be_bryan	0:b74591d5ab33	1635	}
be_bryan	0:b74591d5ab33	1636
be_bryan	0:b74591d5ab33	1637	ext_len = ( buf[ext_offset + 0] << 8 )
be_bryan	0:b74591d5ab33	1638	\| ( buf[ext_offset + 1] );
be_bryan	0:b74591d5ab33	1639
be_bryan	0:b74591d5ab33	1640	if( ( ext_len > 0 && ext_len < 4 ) \|\|
be_bryan	0:b74591d5ab33	1641	msg_len != ext_offset + 2 + ext_len )
be_bryan	0:b74591d5ab33	1642	{
be_bryan	0:b74591d5ab33	1643	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
be_bryan	0:b74591d5ab33	1644	mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
be_bryan	0:b74591d5ab33	1645	MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
be_bryan	0:b74591d5ab33	1646	return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
be_bryan	0:b74591d5ab33	1647	}
be_bryan	0:b74591d5ab33	1648	}
be_bryan	0:b74591d5ab33	1649	else
be_bryan	0:b74591d5ab33	1650	ext_len = 0;
be_bryan	0:b74591d5ab33	1651
be_bryan	0:b74591d5ab33	1652	ext = buf + ext_offset + 2;
be_bryan	0:b74591d5ab33	1653	MBEDTLS_SSL_DEBUG_BUF( 3, "client hello extensions", ext, ext_len );
be_bryan	0:b74591d5ab33	1654
be_bryan	0:b74591d5ab33	1655	while( ext_len != 0 )
be_bryan	0:b74591d5ab33	1656	{
be_bryan	0:b74591d5ab33	1657	unsigned int ext_id = ( ( ext[0] << 8 )
be_bryan	0:b74591d5ab33	1658	\| ( ext[1] ) );
be_bryan	0:b74591d5ab33	1659	unsigned int ext_size = ( ( ext[2] << 8 )
be_bryan	0:b74591d5ab33	1660	\| ( ext[3] ) );
be_bryan	0:b74591d5ab33	1661
be_bryan	0:b74591d5ab33	1662	if( ext_size + 4 > ext_len )
be_bryan	0:b74591d5ab33	1663	{
be_bryan	0:b74591d5ab33	1664	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
be_bryan	0:b74591d5ab33	1665	mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
be_bryan	0:b74591d5ab33	1666	MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
be_bryan	0:b74591d5ab33	1667	return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
be_bryan	0:b74591d5ab33	1668	}
be_bryan	0:b74591d5ab33	1669	switch( ext_id )
be_bryan	0:b74591d5ab33	1670	{
be_bryan	0:b74591d5ab33	1671	#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
be_bryan	0:b74591d5ab33	1672	case MBEDTLS_TLS_EXT_SERVERNAME:
be_bryan	0:b74591d5ab33	1673	MBEDTLS_SSL_DEBUG_MSG( 3, ( "found ServerName extension" ) );
be_bryan	0:b74591d5ab33	1674	if( ssl->conf->f_sni == NULL )
be_bryan	0:b74591d5ab33	1675	break;
be_bryan	0:b74591d5ab33	1676
be_bryan	0:b74591d5ab33	1677	ret = ssl_parse_servername_ext( ssl, ext + 4, ext_size );
be_bryan	0:b74591d5ab33	1678	if( ret != 0 )
be_bryan	0:b74591d5ab33	1679	return( ret );
be_bryan	0:b74591d5ab33	1680	break;
be_bryan	0:b74591d5ab33	1681	#endif /* MBEDTLS_SSL_SERVER_NAME_INDICATION */
be_bryan	0:b74591d5ab33	1682
be_bryan	0:b74591d5ab33	1683	case MBEDTLS_TLS_EXT_RENEGOTIATION_INFO:
be_bryan	0:b74591d5ab33	1684	MBEDTLS_SSL_DEBUG_MSG( 3, ( "found renegotiation extension" ) );
be_bryan	0:b74591d5ab33	1685	#if defined(MBEDTLS_SSL_RENEGOTIATION)
be_bryan	0:b74591d5ab33	1686	renegotiation_info_seen = 1;
be_bryan	0:b74591d5ab33	1687	#endif
be_bryan	0:b74591d5ab33	1688
be_bryan	0:b74591d5ab33	1689	ret = ssl_parse_renegotiation_info( ssl, ext + 4, ext_size );
be_bryan	0:b74591d5ab33	1690	if( ret != 0 )
be_bryan	0:b74591d5ab33	1691	return( ret );
be_bryan	0:b74591d5ab33	1692	break;
be_bryan	0:b74591d5ab33	1693
be_bryan	0:b74591d5ab33	1694	#if defined(MBEDTLS_SSL_PROTO_TLS1_2) && \
be_bryan	0:b74591d5ab33	1695	defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED)
be_bryan	0:b74591d5ab33	1696	case MBEDTLS_TLS_EXT_SIG_ALG:
be_bryan	0:b74591d5ab33	1697	MBEDTLS_SSL_DEBUG_MSG( 3, ( "found signature_algorithms extension" ) );
be_bryan	0:b74591d5ab33	1698	#if defined(MBEDTLS_SSL_RENEGOTIATION)
be_bryan	0:b74591d5ab33	1699	if( ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS )
be_bryan	0:b74591d5ab33	1700	break;
be_bryan	0:b74591d5ab33	1701	#endif
be_bryan	0:b74591d5ab33	1702	ret = ssl_parse_signature_algorithms_ext( ssl, ext + 4, ext_size );
be_bryan	0:b74591d5ab33	1703	if( ret != 0 )
be_bryan	0:b74591d5ab33	1704	return( ret );
be_bryan	0:b74591d5ab33	1705
be_bryan	0:b74591d5ab33	1706	sig_hash_alg_ext_present = 1;
be_bryan	0:b74591d5ab33	1707	break;
be_bryan	0:b74591d5ab33	1708	#endif /* MBEDTLS_SSL_PROTO_TLS1_2 &&
be_bryan	0:b74591d5ab33	1709	MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED */
be_bryan	0:b74591d5ab33	1710
be_bryan	0:b74591d5ab33	1711	#if defined(MBEDTLS_ECDH_C) \|\| defined(MBEDTLS_ECDSA_C) \|\| \
be_bryan	0:b74591d5ab33	1712	defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
be_bryan	0:b74591d5ab33	1713	case MBEDTLS_TLS_EXT_SUPPORTED_ELLIPTIC_CURVES:
be_bryan	0:b74591d5ab33	1714	MBEDTLS_SSL_DEBUG_MSG( 3, ( "found supported elliptic curves extension" ) );
be_bryan	0:b74591d5ab33	1715
be_bryan	0:b74591d5ab33	1716	ret = ssl_parse_supported_elliptic_curves( ssl, ext + 4, ext_size );
be_bryan	0:b74591d5ab33	1717	if( ret != 0 )
be_bryan	0:b74591d5ab33	1718	return( ret );
be_bryan	0:b74591d5ab33	1719	break;
be_bryan	0:b74591d5ab33	1720
be_bryan	0:b74591d5ab33	1721	case MBEDTLS_TLS_EXT_SUPPORTED_POINT_FORMATS:
be_bryan	0:b74591d5ab33	1722	MBEDTLS_SSL_DEBUG_MSG( 3, ( "found supported point formats extension" ) );
be_bryan	0:b74591d5ab33	1723	ssl->handshake->cli_exts \|= MBEDTLS_TLS_EXT_SUPPORTED_POINT_FORMATS_PRESENT;
be_bryan	0:b74591d5ab33	1724
be_bryan	0:b74591d5ab33	1725	ret = ssl_parse_supported_point_formats( ssl, ext + 4, ext_size );
be_bryan	0:b74591d5ab33	1726	if( ret != 0 )
be_bryan	0:b74591d5ab33	1727	return( ret );
be_bryan	0:b74591d5ab33	1728	break;
be_bryan	0:b74591d5ab33	1729	#endif /* MBEDTLS_ECDH_C \|\| MBEDTLS_ECDSA_C \|\|
be_bryan	0:b74591d5ab33	1730	MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */
be_bryan	0:b74591d5ab33	1731
be_bryan	0:b74591d5ab33	1732	#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
be_bryan	0:b74591d5ab33	1733	case MBEDTLS_TLS_EXT_ECJPAKE_KKPP:
be_bryan	0:b74591d5ab33	1734	MBEDTLS_SSL_DEBUG_MSG( 3, ( "found ecjpake kkpp extension" ) );
be_bryan	0:b74591d5ab33	1735
be_bryan	0:b74591d5ab33	1736	ret = ssl_parse_ecjpake_kkpp( ssl, ext + 4, ext_size );
be_bryan	0:b74591d5ab33	1737	if( ret != 0 )
be_bryan	0:b74591d5ab33	1738	return( ret );
be_bryan	0:b74591d5ab33	1739	break;
be_bryan	0:b74591d5ab33	1740	#endif /* MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */
be_bryan	0:b74591d5ab33	1741
be_bryan	0:b74591d5ab33	1742	#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
be_bryan	0:b74591d5ab33	1743	case MBEDTLS_TLS_EXT_MAX_FRAGMENT_LENGTH:
be_bryan	0:b74591d5ab33	1744	MBEDTLS_SSL_DEBUG_MSG( 3, ( "found max fragment length extension" ) );
be_bryan	0:b74591d5ab33	1745
be_bryan	0:b74591d5ab33	1746	ret = ssl_parse_max_fragment_length_ext( ssl, ext + 4, ext_size );
be_bryan	0:b74591d5ab33	1747	if( ret != 0 )
be_bryan	0:b74591d5ab33	1748	return( ret );
be_bryan	0:b74591d5ab33	1749	break;
be_bryan	0:b74591d5ab33	1750	#endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */
be_bryan	0:b74591d5ab33	1751
be_bryan	0:b74591d5ab33	1752	#if defined(MBEDTLS_SSL_TRUNCATED_HMAC)
be_bryan	0:b74591d5ab33	1753	case MBEDTLS_TLS_EXT_TRUNCATED_HMAC:
be_bryan	0:b74591d5ab33	1754	MBEDTLS_SSL_DEBUG_MSG( 3, ( "found truncated hmac extension" ) );
be_bryan	0:b74591d5ab33	1755
be_bryan	0:b74591d5ab33	1756	ret = ssl_parse_truncated_hmac_ext( ssl, ext + 4, ext_size );
be_bryan	0:b74591d5ab33	1757	if( ret != 0 )
be_bryan	0:b74591d5ab33	1758	return( ret );
be_bryan	0:b74591d5ab33	1759	break;
be_bryan	0:b74591d5ab33	1760	#endif /* MBEDTLS_SSL_TRUNCATED_HMAC */
be_bryan	0:b74591d5ab33	1761
be_bryan	0:b74591d5ab33	1762	#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
be_bryan	0:b74591d5ab33	1763	case MBEDTLS_TLS_EXT_ENCRYPT_THEN_MAC:
be_bryan	0:b74591d5ab33	1764	MBEDTLS_SSL_DEBUG_MSG( 3, ( "found encrypt then mac extension" ) );
be_bryan	0:b74591d5ab33	1765
be_bryan	0:b74591d5ab33	1766	ret = ssl_parse_encrypt_then_mac_ext( ssl, ext + 4, ext_size );
be_bryan	0:b74591d5ab33	1767	if( ret != 0 )
be_bryan	0:b74591d5ab33	1768	return( ret );
be_bryan	0:b74591d5ab33	1769	break;
be_bryan	0:b74591d5ab33	1770	#endif /* MBEDTLS_SSL_ENCRYPT_THEN_MAC */
be_bryan	0:b74591d5ab33	1771
be_bryan	0:b74591d5ab33	1772	#if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET)
be_bryan	0:b74591d5ab33	1773	case MBEDTLS_TLS_EXT_EXTENDED_MASTER_SECRET:
be_bryan	0:b74591d5ab33	1774	MBEDTLS_SSL_DEBUG_MSG( 3, ( "found extended master secret extension" ) );
be_bryan	0:b74591d5ab33	1775
be_bryan	0:b74591d5ab33	1776	ret = ssl_parse_extended_ms_ext( ssl, ext + 4, ext_size );
be_bryan	0:b74591d5ab33	1777	if( ret != 0 )
be_bryan	0:b74591d5ab33	1778	return( ret );
be_bryan	0:b74591d5ab33	1779	break;
be_bryan	0:b74591d5ab33	1780	#endif /* MBEDTLS_SSL_EXTENDED_MASTER_SECRET */
be_bryan	0:b74591d5ab33	1781
be_bryan	0:b74591d5ab33	1782	#if defined(MBEDTLS_SSL_SESSION_TICKETS)
be_bryan	0:b74591d5ab33	1783	case MBEDTLS_TLS_EXT_SESSION_TICKET:
be_bryan	0:b74591d5ab33	1784	MBEDTLS_SSL_DEBUG_MSG( 3, ( "found session ticket extension" ) );
be_bryan	0:b74591d5ab33	1785
be_bryan	0:b74591d5ab33	1786	ret = ssl_parse_session_ticket_ext( ssl, ext + 4, ext_size );
be_bryan	0:b74591d5ab33	1787	if( ret != 0 )
be_bryan	0:b74591d5ab33	1788	return( ret );
be_bryan	0:b74591d5ab33	1789	break;
be_bryan	0:b74591d5ab33	1790	#endif /* MBEDTLS_SSL_SESSION_TICKETS */
be_bryan	0:b74591d5ab33	1791
be_bryan	0:b74591d5ab33	1792	#if defined(MBEDTLS_SSL_ALPN)
be_bryan	0:b74591d5ab33	1793	case MBEDTLS_TLS_EXT_ALPN:
be_bryan	0:b74591d5ab33	1794	MBEDTLS_SSL_DEBUG_MSG( 3, ( "found alpn extension" ) );
be_bryan	0:b74591d5ab33	1795
be_bryan	0:b74591d5ab33	1796	ret = ssl_parse_alpn_ext( ssl, ext + 4, ext_size );
be_bryan	0:b74591d5ab33	1797	if( ret != 0 )
be_bryan	0:b74591d5ab33	1798	return( ret );
be_bryan	0:b74591d5ab33	1799	break;
be_bryan	0:b74591d5ab33	1800	#endif /* MBEDTLS_SSL_SESSION_TICKETS */
be_bryan	0:b74591d5ab33	1801
be_bryan	0:b74591d5ab33	1802	default:
be_bryan	0:b74591d5ab33	1803	MBEDTLS_SSL_DEBUG_MSG( 3, ( "unknown extension found: %d (ignoring)",
be_bryan	0:b74591d5ab33	1804	ext_id ) );
be_bryan	0:b74591d5ab33	1805	}
be_bryan	0:b74591d5ab33	1806
be_bryan	0:b74591d5ab33	1807	ext_len -= 4 + ext_size;
be_bryan	0:b74591d5ab33	1808	ext += 4 + ext_size;
be_bryan	0:b74591d5ab33	1809
be_bryan	0:b74591d5ab33	1810	if( ext_len > 0 && ext_len < 4 )
be_bryan	0:b74591d5ab33	1811	{
be_bryan	0:b74591d5ab33	1812	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
be_bryan	0:b74591d5ab33	1813	mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
be_bryan	0:b74591d5ab33	1814	MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
be_bryan	0:b74591d5ab33	1815	return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
be_bryan	0:b74591d5ab33	1816	}
be_bryan	0:b74591d5ab33	1817	}
be_bryan	0:b74591d5ab33	1818	#if defined(MBEDTLS_SSL_PROTO_SSL3)
be_bryan	0:b74591d5ab33	1819	}
be_bryan	0:b74591d5ab33	1820	#endif
be_bryan	0:b74591d5ab33	1821
be_bryan	0:b74591d5ab33	1822	#if defined(MBEDTLS_SSL_FALLBACK_SCSV)
be_bryan	0:b74591d5ab33	1823	for( i = 0, p = buf + ciph_offset + 2; i < ciph_len; i += 2, p += 2 )
be_bryan	0:b74591d5ab33	1824	{
be_bryan	0:b74591d5ab33	1825	if( p[0] == (unsigned char)( ( MBEDTLS_SSL_FALLBACK_SCSV_VALUE >> 8 ) & 0xff ) &&
be_bryan	0:b74591d5ab33	1826	p[1] == (unsigned char)( ( MBEDTLS_SSL_FALLBACK_SCSV_VALUE ) & 0xff ) )
be_bryan	0:b74591d5ab33	1827	{
be_bryan	0:b74591d5ab33	1828	MBEDTLS_SSL_DEBUG_MSG( 2, ( "received FALLBACK_SCSV" ) );
be_bryan	0:b74591d5ab33	1829
be_bryan	0:b74591d5ab33	1830	if( ssl->minor_ver < ssl->conf->max_minor_ver )
be_bryan	0:b74591d5ab33	1831	{
be_bryan	0:b74591d5ab33	1832	MBEDTLS_SSL_DEBUG_MSG( 1, ( "inapropriate fallback" ) );
be_bryan	0:b74591d5ab33	1833
be_bryan	0:b74591d5ab33	1834	mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
be_bryan	0:b74591d5ab33	1835	MBEDTLS_SSL_ALERT_MSG_INAPROPRIATE_FALLBACK );
be_bryan	0:b74591d5ab33	1836
be_bryan	0:b74591d5ab33	1837	return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
be_bryan	0:b74591d5ab33	1838	}
be_bryan	0:b74591d5ab33	1839
be_bryan	0:b74591d5ab33	1840	break;
be_bryan	0:b74591d5ab33	1841	}
be_bryan	0:b74591d5ab33	1842	}
be_bryan	0:b74591d5ab33	1843	#endif /* MBEDTLS_SSL_FALLBACK_SCSV */
be_bryan	0:b74591d5ab33	1844
be_bryan	0:b74591d5ab33	1845	#if defined(MBEDTLS_SSL_PROTO_TLS1_2) && \
be_bryan	0:b74591d5ab33	1846	defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED)
be_bryan	0:b74591d5ab33	1847
be_bryan	0:b74591d5ab33	1848	/*
be_bryan	0:b74591d5ab33	1849	* Try to fall back to default hash SHA1 if the client
be_bryan	0:b74591d5ab33	1850	* hasn't provided any preferred signature-hash combinations.
be_bryan	0:b74591d5ab33	1851	*/
be_bryan	0:b74591d5ab33	1852	if( sig_hash_alg_ext_present == 0 )
be_bryan	0:b74591d5ab33	1853	{
be_bryan	0:b74591d5ab33	1854	mbedtls_md_type_t md_default = MBEDTLS_MD_SHA1;
be_bryan	0:b74591d5ab33	1855
be_bryan	0:b74591d5ab33	1856	if( mbedtls_ssl_check_sig_hash( ssl, md_default ) != 0 )
be_bryan	0:b74591d5ab33	1857	md_default = MBEDTLS_MD_NONE;
be_bryan	0:b74591d5ab33	1858
be_bryan	0:b74591d5ab33	1859	mbedtls_ssl_sig_hash_set_const_hash( &ssl->handshake->hash_algs, md_default );
be_bryan	0:b74591d5ab33	1860	}
be_bryan	0:b74591d5ab33	1861
be_bryan	0:b74591d5ab33	1862	#endif /* MBEDTLS_SSL_PROTO_TLS1_2 &&
be_bryan	0:b74591d5ab33	1863	MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED */
be_bryan	0:b74591d5ab33	1864
be_bryan	0:b74591d5ab33	1865	/*
be_bryan	0:b74591d5ab33	1866	* Check for TLS_EMPTY_RENEGOTIATION_INFO_SCSV
be_bryan	0:b74591d5ab33	1867	*/
be_bryan	0:b74591d5ab33	1868	for( i = 0, p = buf + ciph_offset + 2; i < ciph_len; i += 2, p += 2 )
be_bryan	0:b74591d5ab33	1869	{
be_bryan	0:b74591d5ab33	1870	if( p[0] == 0 && p[1] == MBEDTLS_SSL_EMPTY_RENEGOTIATION_INFO )
be_bryan	0:b74591d5ab33	1871	{
be_bryan	0:b74591d5ab33	1872	MBEDTLS_SSL_DEBUG_MSG( 3, ( "received TLS_EMPTY_RENEGOTIATION_INFO " ) );
be_bryan	0:b74591d5ab33	1873	#if defined(MBEDTLS_SSL_RENEGOTIATION)
be_bryan	0:b74591d5ab33	1874	if( ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS )
be_bryan	0:b74591d5ab33	1875	{
be_bryan	0:b74591d5ab33	1876	MBEDTLS_SSL_DEBUG_MSG( 1, ( "received RENEGOTIATION SCSV "
be_bryan	0:b74591d5ab33	1877	"during renegotiation" ) );
be_bryan	0:b74591d5ab33	1878	mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
be_bryan	0:b74591d5ab33	1879	MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE );
be_bryan	0:b74591d5ab33	1880	return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
be_bryan	0:b74591d5ab33	1881	}
be_bryan	0:b74591d5ab33	1882	#endif
be_bryan	0:b74591d5ab33	1883	ssl->secure_renegotiation = MBEDTLS_SSL_SECURE_RENEGOTIATION;
be_bryan	0:b74591d5ab33	1884	break;
be_bryan	0:b74591d5ab33	1885	}
be_bryan	0:b74591d5ab33	1886	}
be_bryan	0:b74591d5ab33	1887
be_bryan	0:b74591d5ab33	1888	/*
be_bryan	0:b74591d5ab33	1889	* Renegotiation security checks
be_bryan	0:b74591d5ab33	1890	*/
be_bryan	0:b74591d5ab33	1891	if( ssl->secure_renegotiation != MBEDTLS_SSL_SECURE_RENEGOTIATION &&
be_bryan	0:b74591d5ab33	1892	ssl->conf->allow_legacy_renegotiation == MBEDTLS_SSL_LEGACY_BREAK_HANDSHAKE )
be_bryan	0:b74591d5ab33	1893	{
be_bryan	0:b74591d5ab33	1894	MBEDTLS_SSL_DEBUG_MSG( 1, ( "legacy renegotiation, breaking off handshake" ) );
be_bryan	0:b74591d5ab33	1895	handshake_failure = 1;
be_bryan	0:b74591d5ab33	1896	}
be_bryan	0:b74591d5ab33	1897	#if defined(MBEDTLS_SSL_RENEGOTIATION)
be_bryan	0:b74591d5ab33	1898	else if( ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS &&
be_bryan	0:b74591d5ab33	1899	ssl->secure_renegotiation == MBEDTLS_SSL_SECURE_RENEGOTIATION &&
be_bryan	0:b74591d5ab33	1900	renegotiation_info_seen == 0 )
be_bryan	0:b74591d5ab33	1901	{
be_bryan	0:b74591d5ab33	1902	MBEDTLS_SSL_DEBUG_MSG( 1, ( "renegotiation_info extension missing (secure)" ) );
be_bryan	0:b74591d5ab33	1903	handshake_failure = 1;
be_bryan	0:b74591d5ab33	1904	}
be_bryan	0:b74591d5ab33	1905	else if( ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS &&
be_bryan	0:b74591d5ab33	1906	ssl->secure_renegotiation == MBEDTLS_SSL_LEGACY_RENEGOTIATION &&
be_bryan	0:b74591d5ab33	1907	ssl->conf->allow_legacy_renegotiation == MBEDTLS_SSL_LEGACY_NO_RENEGOTIATION )
be_bryan	0:b74591d5ab33	1908	{
be_bryan	0:b74591d5ab33	1909	MBEDTLS_SSL_DEBUG_MSG( 1, ( "legacy renegotiation not allowed" ) );
be_bryan	0:b74591d5ab33	1910	handshake_failure = 1;
be_bryan	0:b74591d5ab33	1911	}
be_bryan	0:b74591d5ab33	1912	else if( ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS &&
be_bryan	0:b74591d5ab33	1913	ssl->secure_renegotiation == MBEDTLS_SSL_LEGACY_RENEGOTIATION &&
be_bryan	0:b74591d5ab33	1914	renegotiation_info_seen == 1 )
be_bryan	0:b74591d5ab33	1915	{
be_bryan	0:b74591d5ab33	1916	MBEDTLS_SSL_DEBUG_MSG( 1, ( "renegotiation_info extension present (legacy)" ) );
be_bryan	0:b74591d5ab33	1917	handshake_failure = 1;
be_bryan	0:b74591d5ab33	1918	}
be_bryan	0:b74591d5ab33	1919	#endif /* MBEDTLS_SSL_RENEGOTIATION */
be_bryan	0:b74591d5ab33	1920
be_bryan	0:b74591d5ab33	1921	if( handshake_failure == 1 )
be_bryan	0:b74591d5ab33	1922	{
be_bryan	0:b74591d5ab33	1923	mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
be_bryan	0:b74591d5ab33	1924	MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE );
be_bryan	0:b74591d5ab33	1925	return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
be_bryan	0:b74591d5ab33	1926	}
be_bryan	0:b74591d5ab33	1927
be_bryan	0:b74591d5ab33	1928	/*
be_bryan	0:b74591d5ab33	1929	* Search for a matching ciphersuite
be_bryan	0:b74591d5ab33	1930	* (At the end because we need information from the EC-based extensions
be_bryan	0:b74591d5ab33	1931	* and certificate from the SNI callback triggered by the SNI extension.)
be_bryan	0:b74591d5ab33	1932	*/
be_bryan	0:b74591d5ab33	1933	got_common_suite = 0;
be_bryan	0:b74591d5ab33	1934	ciphersuites = ssl->conf->ciphersuite_list[ssl->minor_ver];
be_bryan	0:b74591d5ab33	1935	ciphersuite_info = NULL;
be_bryan	0:b74591d5ab33	1936	#if defined(MBEDTLS_SSL_SRV_RESPECT_CLIENT_PREFERENCE)
be_bryan	0:b74591d5ab33	1937	for( j = 0, p = buf + ciph_offset + 2; j < ciph_len; j += 2, p += 2 )
be_bryan	0:b74591d5ab33	1938	for( i = 0; ciphersuites[i] != 0; i++ )
be_bryan	0:b74591d5ab33	1939	#else
be_bryan	0:b74591d5ab33	1940	for( i = 0; ciphersuites[i] != 0; i++ )
be_bryan	0:b74591d5ab33	1941	for( j = 0, p = buf + ciph_offset + 2; j < ciph_len; j += 2, p += 2 )
be_bryan	0:b74591d5ab33	1942	#endif
be_bryan	0:b74591d5ab33	1943	{
be_bryan	0:b74591d5ab33	1944	if( p[0] != ( ( ciphersuites[i] >> 8 ) & 0xFF ) \|\|
be_bryan	0:b74591d5ab33	1945	p[1] != ( ( ciphersuites[i] ) & 0xFF ) )
be_bryan	0:b74591d5ab33	1946	continue;
be_bryan	0:b74591d5ab33	1947
be_bryan	0:b74591d5ab33	1948	got_common_suite = 1;
be_bryan	0:b74591d5ab33	1949
be_bryan	0:b74591d5ab33	1950	if( ( ret = ssl_ciphersuite_match( ssl, ciphersuites[i],
be_bryan	0:b74591d5ab33	1951	&ciphersuite_info ) ) != 0 )
be_bryan	0:b74591d5ab33	1952	return( ret );
be_bryan	0:b74591d5ab33	1953
be_bryan	0:b74591d5ab33	1954	if( ciphersuite_info != NULL )
be_bryan	0:b74591d5ab33	1955	goto have_ciphersuite;
be_bryan	0:b74591d5ab33	1956	}
be_bryan	0:b74591d5ab33	1957
be_bryan	0:b74591d5ab33	1958	if( got_common_suite )
be_bryan	0:b74591d5ab33	1959	{
be_bryan	0:b74591d5ab33	1960	MBEDTLS_SSL_DEBUG_MSG( 1, ( "got ciphersuites in common, "
be_bryan	0:b74591d5ab33	1961	"but none of them usable" ) );
be_bryan	0:b74591d5ab33	1962	mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
be_bryan	0:b74591d5ab33	1963	MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE );
be_bryan	0:b74591d5ab33	1964	return( MBEDTLS_ERR_SSL_NO_USABLE_CIPHERSUITE );
be_bryan	0:b74591d5ab33	1965	}
be_bryan	0:b74591d5ab33	1966	else
be_bryan	0:b74591d5ab33	1967	{
be_bryan	0:b74591d5ab33	1968	MBEDTLS_SSL_DEBUG_MSG( 1, ( "got no ciphersuites in common" ) );
be_bryan	0:b74591d5ab33	1969	mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
be_bryan	0:b74591d5ab33	1970	MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE );
be_bryan	0:b74591d5ab33	1971	return( MBEDTLS_ERR_SSL_NO_CIPHER_CHOSEN );
be_bryan	0:b74591d5ab33	1972	}
be_bryan	0:b74591d5ab33	1973
be_bryan	0:b74591d5ab33	1974	have_ciphersuite:
be_bryan	0:b74591d5ab33	1975	MBEDTLS_SSL_DEBUG_MSG( 2, ( "selected ciphersuite: %s", ciphersuite_info->name ) );
be_bryan	0:b74591d5ab33	1976
be_bryan	0:b74591d5ab33	1977	ssl->session_negotiate->ciphersuite = ciphersuites[i];
be_bryan	0:b74591d5ab33	1978	ssl->transform_negotiate->ciphersuite_info = ciphersuite_info;
be_bryan	0:b74591d5ab33	1979
be_bryan	0:b74591d5ab33	1980	ssl->state++;
be_bryan	0:b74591d5ab33	1981
be_bryan	0:b74591d5ab33	1982	#if defined(MBEDTLS_SSL_PROTO_DTLS)
be_bryan	0:b74591d5ab33	1983	if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
be_bryan	0:b74591d5ab33	1984	mbedtls_ssl_recv_flight_completed( ssl );
be_bryan	0:b74591d5ab33	1985	#endif
be_bryan	0:b74591d5ab33	1986
be_bryan	0:b74591d5ab33	1987	/* Debugging-only output for testsuite */
be_bryan	0:b74591d5ab33	1988	#if defined(MBEDTLS_DEBUG_C) && \
be_bryan	0:b74591d5ab33	1989	defined(MBEDTLS_SSL_PROTO_TLS1_2) && \
be_bryan	0:b74591d5ab33	1990	defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED)
be_bryan	0:b74591d5ab33	1991	if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 )
be_bryan	0:b74591d5ab33	1992	{
be_bryan	0:b74591d5ab33	1993	mbedtls_pk_type_t sig_alg = mbedtls_ssl_get_ciphersuite_sig_alg( ciphersuite_info );
be_bryan	0:b74591d5ab33	1994	if( sig_alg != MBEDTLS_PK_NONE )
be_bryan	0:b74591d5ab33	1995	{
be_bryan	0:b74591d5ab33	1996	mbedtls_md_type_t md_alg = mbedtls_ssl_sig_hash_set_find( &ssl->handshake->hash_algs,
be_bryan	0:b74591d5ab33	1997	sig_alg );
be_bryan	0:b74591d5ab33	1998	MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello v3, signature_algorithm ext: %d",
be_bryan	0:b74591d5ab33	1999	mbedtls_ssl_hash_from_md_alg( md_alg ) ) );
be_bryan	0:b74591d5ab33	2000	}
be_bryan	0:b74591d5ab33	2001	else
be_bryan	0:b74591d5ab33	2002	{
be_bryan	0:b74591d5ab33	2003	MBEDTLS_SSL_DEBUG_MSG( 3, ( "no hash algorithm for signature algorithm "
be_bryan	0:b74591d5ab33	2004	"%d - should not happen", sig_alg ) );
be_bryan	0:b74591d5ab33	2005	}
be_bryan	0:b74591d5ab33	2006	}
be_bryan	0:b74591d5ab33	2007	#endif
be_bryan	0:b74591d5ab33	2008
be_bryan	0:b74591d5ab33	2009	MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse client hello" ) );
be_bryan	0:b74591d5ab33	2010
be_bryan	0:b74591d5ab33	2011	return( 0 );
be_bryan	0:b74591d5ab33	2012	}
be_bryan	0:b74591d5ab33	2013
be_bryan	0:b74591d5ab33	2014	#if defined(MBEDTLS_SSL_TRUNCATED_HMAC)
be_bryan	0:b74591d5ab33	2015	static void ssl_write_truncated_hmac_ext( mbedtls_ssl_context *ssl,
be_bryan	0:b74591d5ab33	2016	unsigned char *buf,
be_bryan	0:b74591d5ab33	2017	size_t *olen )
be_bryan	0:b74591d5ab33	2018	{
be_bryan	0:b74591d5ab33	2019	unsigned char *p = buf;
be_bryan	0:b74591d5ab33	2020
be_bryan	0:b74591d5ab33	2021	if( ssl->session_negotiate->trunc_hmac == MBEDTLS_SSL_TRUNC_HMAC_DISABLED )
be_bryan	0:b74591d5ab33	2022	{
be_bryan	0:b74591d5ab33	2023	*olen = 0;
be_bryan	0:b74591d5ab33	2024	return;
be_bryan	0:b74591d5ab33	2025	}
be_bryan	0:b74591d5ab33	2026
be_bryan	0:b74591d5ab33	2027	MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, adding truncated hmac extension" ) );
be_bryan	0:b74591d5ab33	2028
be_bryan	0:b74591d5ab33	2029	*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_TRUNCATED_HMAC >> 8 ) & 0xFF );
be_bryan	0:b74591d5ab33	2030	*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_TRUNCATED_HMAC ) & 0xFF );
be_bryan	0:b74591d5ab33	2031
be_bryan	0:b74591d5ab33	2032	*p++ = 0x00;
be_bryan	0:b74591d5ab33	2033	*p++ = 0x00;
be_bryan	0:b74591d5ab33	2034
be_bryan	0:b74591d5ab33	2035	*olen = 4;
be_bryan	0:b74591d5ab33	2036	}
be_bryan	0:b74591d5ab33	2037	#endif /* MBEDTLS_SSL_TRUNCATED_HMAC */
be_bryan	0:b74591d5ab33	2038
be_bryan	0:b74591d5ab33	2039	#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
be_bryan	0:b74591d5ab33	2040	static void ssl_write_encrypt_then_mac_ext( mbedtls_ssl_context *ssl,
be_bryan	0:b74591d5ab33	2041	unsigned char *buf,
be_bryan	0:b74591d5ab33	2042	size_t *olen )
be_bryan	0:b74591d5ab33	2043	{
be_bryan	0:b74591d5ab33	2044	unsigned char *p = buf;
be_bryan	0:b74591d5ab33	2045	const mbedtls_ssl_ciphersuite_t *suite = NULL;
be_bryan	0:b74591d5ab33	2046	const mbedtls_cipher_info_t *cipher = NULL;
be_bryan	0:b74591d5ab33	2047
be_bryan	0:b74591d5ab33	2048	if( ssl->session_negotiate->encrypt_then_mac == MBEDTLS_SSL_EXTENDED_MS_DISABLED \|\|
be_bryan	0:b74591d5ab33	2049	ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 )
be_bryan	0:b74591d5ab33	2050	{
be_bryan	0:b74591d5ab33	2051	*olen = 0;
be_bryan	0:b74591d5ab33	2052	return;
be_bryan	0:b74591d5ab33	2053	}
be_bryan	0:b74591d5ab33	2054
be_bryan	0:b74591d5ab33	2055	/*
be_bryan	0:b74591d5ab33	2056	* RFC 7366: "If a server receives an encrypt-then-MAC request extension
be_bryan	0:b74591d5ab33	2057	* from a client and then selects a stream or Authenticated Encryption
be_bryan	0:b74591d5ab33	2058	* with Associated Data (AEAD) ciphersuite, it MUST NOT send an
be_bryan	0:b74591d5ab33	2059	* encrypt-then-MAC response extension back to the client."
be_bryan	0:b74591d5ab33	2060	*/
be_bryan	0:b74591d5ab33	2061	if( ( suite = mbedtls_ssl_ciphersuite_from_id(
be_bryan	0:b74591d5ab33	2062	ssl->session_negotiate->ciphersuite ) ) == NULL \|\|
be_bryan	0:b74591d5ab33	2063	( cipher = mbedtls_cipher_info_from_type( suite->cipher ) ) == NULL \|\|
be_bryan	0:b74591d5ab33	2064	cipher->mode != MBEDTLS_MODE_CBC )
be_bryan	0:b74591d5ab33	2065	{
be_bryan	0:b74591d5ab33	2066	*olen = 0;
be_bryan	0:b74591d5ab33	2067	return;
be_bryan	0:b74591d5ab33	2068	}
be_bryan	0:b74591d5ab33	2069
be_bryan	0:b74591d5ab33	2070	MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, adding encrypt then mac extension" ) );
be_bryan	0:b74591d5ab33	2071
be_bryan	0:b74591d5ab33	2072	*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_ENCRYPT_THEN_MAC >> 8 ) & 0xFF );
be_bryan	0:b74591d5ab33	2073	*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_ENCRYPT_THEN_MAC ) & 0xFF );
be_bryan	0:b74591d5ab33	2074
be_bryan	0:b74591d5ab33	2075	*p++ = 0x00;
be_bryan	0:b74591d5ab33	2076	*p++ = 0x00;
be_bryan	0:b74591d5ab33	2077
be_bryan	0:b74591d5ab33	2078	*olen = 4;
be_bryan	0:b74591d5ab33	2079	}
be_bryan	0:b74591d5ab33	2080	#endif /* MBEDTLS_SSL_ENCRYPT_THEN_MAC */
be_bryan	0:b74591d5ab33	2081
be_bryan	0:b74591d5ab33	2082	#if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET)
be_bryan	0:b74591d5ab33	2083	static void ssl_write_extended_ms_ext( mbedtls_ssl_context *ssl,
be_bryan	0:b74591d5ab33	2084	unsigned char *buf,
be_bryan	0:b74591d5ab33	2085	size_t *olen )
be_bryan	0:b74591d5ab33	2086	{
be_bryan	0:b74591d5ab33	2087	unsigned char *p = buf;
be_bryan	0:b74591d5ab33	2088
be_bryan	0:b74591d5ab33	2089	if( ssl->handshake->extended_ms == MBEDTLS_SSL_EXTENDED_MS_DISABLED \|\|
be_bryan	0:b74591d5ab33	2090	ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 )
be_bryan	0:b74591d5ab33	2091	{
be_bryan	0:b74591d5ab33	2092	*olen = 0;
be_bryan	0:b74591d5ab33	2093	return;
be_bryan	0:b74591d5ab33	2094	}
be_bryan	0:b74591d5ab33	2095
be_bryan	0:b74591d5ab33	2096	MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, adding extended master secret "
be_bryan	0:b74591d5ab33	2097	"extension" ) );
be_bryan	0:b74591d5ab33	2098
be_bryan	0:b74591d5ab33	2099	*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_EXTENDED_MASTER_SECRET >> 8 ) & 0xFF );
be_bryan	0:b74591d5ab33	2100	*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_EXTENDED_MASTER_SECRET ) & 0xFF );
be_bryan	0:b74591d5ab33	2101
be_bryan	0:b74591d5ab33	2102	*p++ = 0x00;
be_bryan	0:b74591d5ab33	2103	*p++ = 0x00;
be_bryan	0:b74591d5ab33	2104
be_bryan	0:b74591d5ab33	2105	*olen = 4;
be_bryan	0:b74591d5ab33	2106	}
be_bryan	0:b74591d5ab33	2107	#endif /* MBEDTLS_SSL_EXTENDED_MASTER_SECRET */
be_bryan	0:b74591d5ab33	2108
be_bryan	0:b74591d5ab33	2109	#if defined(MBEDTLS_SSL_SESSION_TICKETS)
be_bryan	0:b74591d5ab33	2110	static void ssl_write_session_ticket_ext( mbedtls_ssl_context *ssl,
be_bryan	0:b74591d5ab33	2111	unsigned char *buf,
be_bryan	0:b74591d5ab33	2112	size_t *olen )
be_bryan	0:b74591d5ab33	2113	{
be_bryan	0:b74591d5ab33	2114	unsigned char *p = buf;
be_bryan	0:b74591d5ab33	2115
be_bryan	0:b74591d5ab33	2116	if( ssl->handshake->new_session_ticket == 0 )
be_bryan	0:b74591d5ab33	2117	{
be_bryan	0:b74591d5ab33	2118	*olen = 0;
be_bryan	0:b74591d5ab33	2119	return;
be_bryan	0:b74591d5ab33	2120	}
be_bryan	0:b74591d5ab33	2121
be_bryan	0:b74591d5ab33	2122	MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, adding session ticket extension" ) );
be_bryan	0:b74591d5ab33	2123
be_bryan	0:b74591d5ab33	2124	*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SESSION_TICKET >> 8 ) & 0xFF );
be_bryan	0:b74591d5ab33	2125	*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SESSION_TICKET ) & 0xFF );
be_bryan	0:b74591d5ab33	2126
be_bryan	0:b74591d5ab33	2127	*p++ = 0x00;
be_bryan	0:b74591d5ab33	2128	*p++ = 0x00;
be_bryan	0:b74591d5ab33	2129
be_bryan	0:b74591d5ab33	2130	*olen = 4;
be_bryan	0:b74591d5ab33	2131	}
be_bryan	0:b74591d5ab33	2132	#endif /* MBEDTLS_SSL_SESSION_TICKETS */
be_bryan	0:b74591d5ab33	2133
be_bryan	0:b74591d5ab33	2134	static void ssl_write_renegotiation_ext( mbedtls_ssl_context *ssl,
be_bryan	0:b74591d5ab33	2135	unsigned char *buf,
be_bryan	0:b74591d5ab33	2136	size_t *olen )
be_bryan	0:b74591d5ab33	2137	{
be_bryan	0:b74591d5ab33	2138	unsigned char *p = buf;
be_bryan	0:b74591d5ab33	2139
be_bryan	0:b74591d5ab33	2140	if( ssl->secure_renegotiation != MBEDTLS_SSL_SECURE_RENEGOTIATION )
be_bryan	0:b74591d5ab33	2141	{
be_bryan	0:b74591d5ab33	2142	*olen = 0;
be_bryan	0:b74591d5ab33	2143	return;
be_bryan	0:b74591d5ab33	2144	}
be_bryan	0:b74591d5ab33	2145
be_bryan	0:b74591d5ab33	2146	MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, secure renegotiation extension" ) );
be_bryan	0:b74591d5ab33	2147
be_bryan	0:b74591d5ab33	2148	*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_RENEGOTIATION_INFO >> 8 ) & 0xFF );
be_bryan	0:b74591d5ab33	2149	*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_RENEGOTIATION_INFO ) & 0xFF );
be_bryan	0:b74591d5ab33	2150
be_bryan	0:b74591d5ab33	2151	#if defined(MBEDTLS_SSL_RENEGOTIATION)
be_bryan	0:b74591d5ab33	2152	if( ssl->renego_status != MBEDTLS_SSL_INITIAL_HANDSHAKE )
be_bryan	0:b74591d5ab33	2153	{
be_bryan	0:b74591d5ab33	2154	*p++ = 0x00;
be_bryan	0:b74591d5ab33	2155	p++ = ( ssl->verify_data_len 2 + 1 ) & 0xFF;
be_bryan	0:b74591d5ab33	2156	p++ = ssl->verify_data_len 2 & 0xFF;
be_bryan	0:b74591d5ab33	2157
be_bryan	0:b74591d5ab33	2158	memcpy( p, ssl->peer_verify_data, ssl->verify_data_len );
be_bryan	0:b74591d5ab33	2159	p += ssl->verify_data_len;
be_bryan	0:b74591d5ab33	2160	memcpy( p, ssl->own_verify_data, ssl->verify_data_len );
be_bryan	0:b74591d5ab33	2161	p += ssl->verify_data_len;
be_bryan	0:b74591d5ab33	2162	}
be_bryan	0:b74591d5ab33	2163	else
be_bryan	0:b74591d5ab33	2164	#endif /* MBEDTLS_SSL_RENEGOTIATION */
be_bryan	0:b74591d5ab33	2165	{
be_bryan	0:b74591d5ab33	2166	*p++ = 0x00;
be_bryan	0:b74591d5ab33	2167	*p++ = 0x01;
be_bryan	0:b74591d5ab33	2168	*p++ = 0x00;
be_bryan	0:b74591d5ab33	2169	}
be_bryan	0:b74591d5ab33	2170
be_bryan	0:b74591d5ab33	2171	*olen = p - buf;
be_bryan	0:b74591d5ab33	2172	}
be_bryan	0:b74591d5ab33	2173
be_bryan	0:b74591d5ab33	2174	#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
be_bryan	0:b74591d5ab33	2175	static void ssl_write_max_fragment_length_ext( mbedtls_ssl_context *ssl,
be_bryan	0:b74591d5ab33	2176	unsigned char *buf,
be_bryan	0:b74591d5ab33	2177	size_t *olen )
be_bryan	0:b74591d5ab33	2178	{
be_bryan	0:b74591d5ab33	2179	unsigned char *p = buf;
be_bryan	0:b74591d5ab33	2180
be_bryan	0:b74591d5ab33	2181	if( ssl->session_negotiate->mfl_code == MBEDTLS_SSL_MAX_FRAG_LEN_NONE )
be_bryan	0:b74591d5ab33	2182	{
be_bryan	0:b74591d5ab33	2183	*olen = 0;
be_bryan	0:b74591d5ab33	2184	return;
be_bryan	0:b74591d5ab33	2185	}
be_bryan	0:b74591d5ab33	2186
be_bryan	0:b74591d5ab33	2187	MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, max_fragment_length extension" ) );
be_bryan	0:b74591d5ab33	2188
be_bryan	0:b74591d5ab33	2189	*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_MAX_FRAGMENT_LENGTH >> 8 ) & 0xFF );
be_bryan	0:b74591d5ab33	2190	*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_MAX_FRAGMENT_LENGTH ) & 0xFF );
be_bryan	0:b74591d5ab33	2191
be_bryan	0:b74591d5ab33	2192	*p++ = 0x00;
be_bryan	0:b74591d5ab33	2193	*p++ = 1;
be_bryan	0:b74591d5ab33	2194
be_bryan	0:b74591d5ab33	2195	*p++ = ssl->session_negotiate->mfl_code;
be_bryan	0:b74591d5ab33	2196
be_bryan	0:b74591d5ab33	2197	*olen = 5;
be_bryan	0:b74591d5ab33	2198	}
be_bryan	0:b74591d5ab33	2199	#endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */
be_bryan	0:b74591d5ab33	2200
be_bryan	0:b74591d5ab33	2201	#if defined(MBEDTLS_ECDH_C) \|\| defined(MBEDTLS_ECDSA_C) \|\| \
be_bryan	0:b74591d5ab33	2202	defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
be_bryan	0:b74591d5ab33	2203	static void ssl_write_supported_point_formats_ext( mbedtls_ssl_context *ssl,
be_bryan	0:b74591d5ab33	2204	unsigned char *buf,
be_bryan	0:b74591d5ab33	2205	size_t *olen )
be_bryan	0:b74591d5ab33	2206	{
be_bryan	0:b74591d5ab33	2207	unsigned char *p = buf;
be_bryan	0:b74591d5ab33	2208	((void) ssl);
be_bryan	0:b74591d5ab33	2209
be_bryan	0:b74591d5ab33	2210	if( ( ssl->handshake->cli_exts &
be_bryan	0:b74591d5ab33	2211	MBEDTLS_TLS_EXT_SUPPORTED_POINT_FORMATS_PRESENT ) == 0 )
be_bryan	0:b74591d5ab33	2212	{
be_bryan	0:b74591d5ab33	2213	*olen = 0;
be_bryan	0:b74591d5ab33	2214	return;
be_bryan	0:b74591d5ab33	2215	}
be_bryan	0:b74591d5ab33	2216
be_bryan	0:b74591d5ab33	2217	MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, supported_point_formats extension" ) );
be_bryan	0:b74591d5ab33	2218
be_bryan	0:b74591d5ab33	2219	*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SUPPORTED_POINT_FORMATS >> 8 ) & 0xFF );
be_bryan	0:b74591d5ab33	2220	*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SUPPORTED_POINT_FORMATS ) & 0xFF );
be_bryan	0:b74591d5ab33	2221
be_bryan	0:b74591d5ab33	2222	*p++ = 0x00;
be_bryan	0:b74591d5ab33	2223	*p++ = 2;
be_bryan	0:b74591d5ab33	2224
be_bryan	0:b74591d5ab33	2225	*p++ = 1;
be_bryan	0:b74591d5ab33	2226	*p++ = MBEDTLS_ECP_PF_UNCOMPRESSED;
be_bryan	0:b74591d5ab33	2227
be_bryan	0:b74591d5ab33	2228	*olen = 6;
be_bryan	0:b74591d5ab33	2229	}
be_bryan	0:b74591d5ab33	2230	#endif /* MBEDTLS_ECDH_C \|\| MBEDTLS_ECDSA_C \|\| MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */
be_bryan	0:b74591d5ab33	2231
be_bryan	0:b74591d5ab33	2232	#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
be_bryan	0:b74591d5ab33	2233	static void ssl_write_ecjpake_kkpp_ext( mbedtls_ssl_context *ssl,
be_bryan	0:b74591d5ab33	2234	unsigned char *buf,
be_bryan	0:b74591d5ab33	2235	size_t *olen )
be_bryan	0:b74591d5ab33	2236	{
be_bryan	0:b74591d5ab33	2237	int ret;
be_bryan	0:b74591d5ab33	2238	unsigned char *p = buf;
be_bryan	0:b74591d5ab33	2239	const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_MAX_CONTENT_LEN;
be_bryan	0:b74591d5ab33	2240	size_t kkpp_len;
be_bryan	0:b74591d5ab33	2241
be_bryan	0:b74591d5ab33	2242	*olen = 0;
be_bryan	0:b74591d5ab33	2243
be_bryan	0:b74591d5ab33	2244	/* Skip costly computation if not needed */
be_bryan	0:b74591d5ab33	2245	if( ssl->transform_negotiate->ciphersuite_info->key_exchange !=
be_bryan	0:b74591d5ab33	2246	MBEDTLS_KEY_EXCHANGE_ECJPAKE )
be_bryan	0:b74591d5ab33	2247	return;
be_bryan	0:b74591d5ab33	2248
be_bryan	0:b74591d5ab33	2249	MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, ecjpake kkpp extension" ) );
be_bryan	0:b74591d5ab33	2250
be_bryan	0:b74591d5ab33	2251	if( end - p < 4 )
be_bryan	0:b74591d5ab33	2252	{
be_bryan	0:b74591d5ab33	2253	MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small" ) );
be_bryan	0:b74591d5ab33	2254	return;
be_bryan	0:b74591d5ab33	2255	}
be_bryan	0:b74591d5ab33	2256
be_bryan	0:b74591d5ab33	2257	*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_ECJPAKE_KKPP >> 8 ) & 0xFF );
be_bryan	0:b74591d5ab33	2258	*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_ECJPAKE_KKPP ) & 0xFF );
be_bryan	0:b74591d5ab33	2259
be_bryan	0:b74591d5ab33	2260	ret = mbedtls_ecjpake_write_round_one( &ssl->handshake->ecjpake_ctx,
be_bryan	0:b74591d5ab33	2261	p + 2, end - p - 2, &kkpp_len,
be_bryan	0:b74591d5ab33	2262	ssl->conf->f_rng, ssl->conf->p_rng );
be_bryan	0:b74591d5ab33	2263	if( ret != 0 )
be_bryan	0:b74591d5ab33	2264	{
be_bryan	0:b74591d5ab33	2265	MBEDTLS_SSL_DEBUG_RET( 1 , "mbedtls_ecjpake_write_round_one", ret );
be_bryan	0:b74591d5ab33	2266	return;
be_bryan	0:b74591d5ab33	2267	}
be_bryan	0:b74591d5ab33	2268
be_bryan	0:b74591d5ab33	2269	*p++ = (unsigned char)( ( kkpp_len >> 8 ) & 0xFF );
be_bryan	0:b74591d5ab33	2270	*p++ = (unsigned char)( ( kkpp_len ) & 0xFF );
be_bryan	0:b74591d5ab33	2271
be_bryan	0:b74591d5ab33	2272	*olen = kkpp_len + 4;
be_bryan	0:b74591d5ab33	2273	}
be_bryan	0:b74591d5ab33	2274	#endif /* MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */
be_bryan	0:b74591d5ab33	2275
be_bryan	0:b74591d5ab33	2276	#if defined(MBEDTLS_SSL_ALPN )
be_bryan	0:b74591d5ab33	2277	static void ssl_write_alpn_ext( mbedtls_ssl_context *ssl,
be_bryan	0:b74591d5ab33	2278	unsigned char buf, size_t olen )
be_bryan	0:b74591d5ab33	2279	{
be_bryan	0:b74591d5ab33	2280	if( ssl->alpn_chosen == NULL )
be_bryan	0:b74591d5ab33	2281	{
be_bryan	0:b74591d5ab33	2282	*olen = 0;
be_bryan	0:b74591d5ab33	2283	return;
be_bryan	0:b74591d5ab33	2284	}
be_bryan	0:b74591d5ab33	2285
be_bryan	0:b74591d5ab33	2286	MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, adding alpn extension" ) );
be_bryan	0:b74591d5ab33	2287
be_bryan	0:b74591d5ab33	2288	/*
be_bryan	0:b74591d5ab33	2289	* 0 . 1 ext identifier
be_bryan	0:b74591d5ab33	2290	* 2 . 3 ext length
be_bryan	0:b74591d5ab33	2291	* 4 . 5 protocol list length
be_bryan	0:b74591d5ab33	2292	* 6 . 6 protocol name length
be_bryan	0:b74591d5ab33	2293	* 7 . 7+n protocol name
be_bryan	0:b74591d5ab33	2294	*/
be_bryan	0:b74591d5ab33	2295	buf[0] = (unsigned char)( ( MBEDTLS_TLS_EXT_ALPN >> 8 ) & 0xFF );
be_bryan	0:b74591d5ab33	2296	buf[1] = (unsigned char)( ( MBEDTLS_TLS_EXT_ALPN ) & 0xFF );
be_bryan	0:b74591d5ab33	2297
be_bryan	0:b74591d5ab33	2298	*olen = 7 + strlen( ssl->alpn_chosen );
be_bryan	0:b74591d5ab33	2299
be_bryan	0:b74591d5ab33	2300	buf[2] = (unsigned char)( ( ( *olen - 4 ) >> 8 ) & 0xFF );
be_bryan	0:b74591d5ab33	2301	buf[3] = (unsigned char)( ( ( *olen - 4 ) ) & 0xFF );
be_bryan	0:b74591d5ab33	2302
be_bryan	0:b74591d5ab33	2303	buf[4] = (unsigned char)( ( ( *olen - 6 ) >> 8 ) & 0xFF );
be_bryan	0:b74591d5ab33	2304	buf[5] = (unsigned char)( ( ( *olen - 6 ) ) & 0xFF );
be_bryan	0:b74591d5ab33	2305
be_bryan	0:b74591d5ab33	2306	buf[6] = (unsigned char)( ( ( *olen - 7 ) ) & 0xFF );
be_bryan	0:b74591d5ab33	2307
be_bryan	0:b74591d5ab33	2308	memcpy( buf + 7, ssl->alpn_chosen, *olen - 7 );
be_bryan	0:b74591d5ab33	2309	}
be_bryan	0:b74591d5ab33	2310	#endif /* MBEDTLS_ECDH_C \|\| MBEDTLS_ECDSA_C */
be_bryan	0:b74591d5ab33	2311
be_bryan	0:b74591d5ab33	2312	#if defined(MBEDTLS_SSL_DTLS_HELLO_VERIFY)
be_bryan	0:b74591d5ab33	2313	static int ssl_write_hello_verify_request( mbedtls_ssl_context *ssl )
be_bryan	0:b74591d5ab33	2314	{
be_bryan	0:b74591d5ab33	2315	int ret;
be_bryan	0:b74591d5ab33	2316	unsigned char *p = ssl->out_msg + 4;
be_bryan	0:b74591d5ab33	2317	unsigned char *cookie_len_byte;
be_bryan	0:b74591d5ab33	2318
be_bryan	0:b74591d5ab33	2319	MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write hello verify request" ) );
be_bryan	0:b74591d5ab33	2320
be_bryan	0:b74591d5ab33	2321	/*
be_bryan	0:b74591d5ab33	2322	* struct {
be_bryan	0:b74591d5ab33	2323	* ProtocolVersion server_version;
be_bryan	0:b74591d5ab33	2324	* opaque cookie<0..2^8-1>;
be_bryan	0:b74591d5ab33	2325	* } HelloVerifyRequest;
be_bryan	0:b74591d5ab33	2326	*/
be_bryan	0:b74591d5ab33	2327
be_bryan	0:b74591d5ab33	2328	/* The RFC is not clear on this point, but sending the actual negotiated
be_bryan	0:b74591d5ab33	2329	* version looks like the most interoperable thing to do. */
be_bryan	0:b74591d5ab33	2330	mbedtls_ssl_write_version( ssl->major_ver, ssl->minor_ver,
be_bryan	0:b74591d5ab33	2331	ssl->conf->transport, p );
be_bryan	0:b74591d5ab33	2332	MBEDTLS_SSL_DEBUG_BUF( 3, "server version", p, 2 );
be_bryan	0:b74591d5ab33	2333	p += 2;
be_bryan	0:b74591d5ab33	2334
be_bryan	0:b74591d5ab33	2335	/* If we get here, f_cookie_check is not null */
be_bryan	0:b74591d5ab33	2336	if( ssl->conf->f_cookie_write == NULL )
be_bryan	0:b74591d5ab33	2337	{
be_bryan	0:b74591d5ab33	2338	MBEDTLS_SSL_DEBUG_MSG( 1, ( "inconsistent cookie callbacks" ) );
be_bryan	0:b74591d5ab33	2339	return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
be_bryan	0:b74591d5ab33	2340	}
be_bryan	0:b74591d5ab33	2341
be_bryan	0:b74591d5ab33	2342	/* Skip length byte until we know the length */
be_bryan	0:b74591d5ab33	2343	cookie_len_byte = p++;
be_bryan	0:b74591d5ab33	2344
be_bryan	0:b74591d5ab33	2345	if( ( ret = ssl->conf->f_cookie_write( ssl->conf->p_cookie,
be_bryan	0:b74591d5ab33	2346	&p, ssl->out_buf + MBEDTLS_SSL_BUFFER_LEN,
be_bryan	0:b74591d5ab33	2347	ssl->cli_id, ssl->cli_id_len ) ) != 0 )
be_bryan	0:b74591d5ab33	2348	{
be_bryan	0:b74591d5ab33	2349	MBEDTLS_SSL_DEBUG_RET( 1, "f_cookie_write", ret );
be_bryan	0:b74591d5ab33	2350	return( ret );
be_bryan	0:b74591d5ab33	2351	}
be_bryan	0:b74591d5ab33	2352
be_bryan	0:b74591d5ab33	2353	*cookie_len_byte = (unsigned char)( p - ( cookie_len_byte + 1 ) );
be_bryan	0:b74591d5ab33	2354
be_bryan	0:b74591d5ab33	2355	MBEDTLS_SSL_DEBUG_BUF( 3, "cookie sent", cookie_len_byte + 1, *cookie_len_byte );
be_bryan	0:b74591d5ab33	2356
be_bryan	0:b74591d5ab33	2357	ssl->out_msglen = p - ssl->out_msg;
be_bryan	0:b74591d5ab33	2358	ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE;
be_bryan	0:b74591d5ab33	2359	ssl->out_msg[0] = MBEDTLS_SSL_HS_HELLO_VERIFY_REQUEST;
be_bryan	0:b74591d5ab33	2360
be_bryan	0:b74591d5ab33	2361	ssl->state = MBEDTLS_SSL_SERVER_HELLO_VERIFY_REQUEST_SENT;
be_bryan	0:b74591d5ab33	2362
be_bryan	0:b74591d5ab33	2363	if( ( ret = mbedtls_ssl_write_record( ssl ) ) != 0 )
be_bryan	0:b74591d5ab33	2364	{
be_bryan	0:b74591d5ab33	2365	MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_record", ret );
be_bryan	0:b74591d5ab33	2366	return( ret );
be_bryan	0:b74591d5ab33	2367	}
be_bryan	0:b74591d5ab33	2368
be_bryan	0:b74591d5ab33	2369	MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write hello verify request" ) );
be_bryan	0:b74591d5ab33	2370
be_bryan	0:b74591d5ab33	2371	return( 0 );
be_bryan	0:b74591d5ab33	2372	}
be_bryan	0:b74591d5ab33	2373	#endif /* MBEDTLS_SSL_DTLS_HELLO_VERIFY */
be_bryan	0:b74591d5ab33	2374
be_bryan	0:b74591d5ab33	2375	static int ssl_write_server_hello( mbedtls_ssl_context *ssl )
be_bryan	0:b74591d5ab33	2376	{
be_bryan	0:b74591d5ab33	2377	#if defined(MBEDTLS_HAVE_TIME)
be_bryan	0:b74591d5ab33	2378	mbedtls_time_t t;
be_bryan	0:b74591d5ab33	2379	#endif
be_bryan	0:b74591d5ab33	2380	int ret;
be_bryan	0:b74591d5ab33	2381	size_t olen, ext_len = 0, n;
be_bryan	0:b74591d5ab33	2382	unsigned char buf, p;
be_bryan	0:b74591d5ab33	2383
be_bryan	0:b74591d5ab33	2384	MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write server hello" ) );
be_bryan	0:b74591d5ab33	2385
be_bryan	0:b74591d5ab33	2386	#if defined(MBEDTLS_SSL_DTLS_HELLO_VERIFY)
be_bryan	0:b74591d5ab33	2387	if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
be_bryan	0:b74591d5ab33	2388	ssl->handshake->verify_cookie_len != 0 )
be_bryan	0:b74591d5ab33	2389	{
be_bryan	0:b74591d5ab33	2390	MBEDTLS_SSL_DEBUG_MSG( 2, ( "client hello was not authenticated" ) );
be_bryan	0:b74591d5ab33	2391	MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write server hello" ) );
be_bryan	0:b74591d5ab33	2392
be_bryan	0:b74591d5ab33	2393	return( ssl_write_hello_verify_request( ssl ) );
be_bryan	0:b74591d5ab33	2394	}
be_bryan	0:b74591d5ab33	2395	#endif /* MBEDTLS_SSL_DTLS_HELLO_VERIFY */
be_bryan	0:b74591d5ab33	2396
be_bryan	0:b74591d5ab33	2397	if( ssl->conf->f_rng == NULL )
be_bryan	0:b74591d5ab33	2398	{
be_bryan	0:b74591d5ab33	2399	MBEDTLS_SSL_DEBUG_MSG( 1, ( "no RNG provided") );
be_bryan	0:b74591d5ab33	2400	return( MBEDTLS_ERR_SSL_NO_RNG );
be_bryan	0:b74591d5ab33	2401	}
be_bryan	0:b74591d5ab33	2402
be_bryan	0:b74591d5ab33	2403	/*
be_bryan	0:b74591d5ab33	2404	* 0 . 0 handshake type
be_bryan	0:b74591d5ab33	2405	* 1 . 3 handshake length
be_bryan	0:b74591d5ab33	2406	* 4 . 5 protocol version
be_bryan	0:b74591d5ab33	2407	* 6 . 9 UNIX time()
be_bryan	0:b74591d5ab33	2408	* 10 . 37 random bytes
be_bryan	0:b74591d5ab33	2409	*/
be_bryan	0:b74591d5ab33	2410	buf = ssl->out_msg;
be_bryan	0:b74591d5ab33	2411	p = buf + 4;
be_bryan	0:b74591d5ab33	2412
be_bryan	0:b74591d5ab33	2413	mbedtls_ssl_write_version( ssl->major_ver, ssl->minor_ver,
be_bryan	0:b74591d5ab33	2414	ssl->conf->transport, p );
be_bryan	0:b74591d5ab33	2415	p += 2;
be_bryan	0:b74591d5ab33	2416
be_bryan	0:b74591d5ab33	2417	MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, chosen version: [%d:%d]",
be_bryan	0:b74591d5ab33	2418	buf[4], buf[5] ) );
be_bryan	0:b74591d5ab33	2419
be_bryan	0:b74591d5ab33	2420	#if defined(MBEDTLS_HAVE_TIME)
be_bryan	0:b74591d5ab33	2421	t = mbedtls_time( NULL );
be_bryan	0:b74591d5ab33	2422	*p++ = (unsigned char)( t >> 24 );
be_bryan	0:b74591d5ab33	2423	*p++ = (unsigned char)( t >> 16 );
be_bryan	0:b74591d5ab33	2424	*p++ = (unsigned char)( t >> 8 );
be_bryan	0:b74591d5ab33	2425	*p++ = (unsigned char)( t );
be_bryan	0:b74591d5ab33	2426
be_bryan	0:b74591d5ab33	2427	MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, current time: %lu", t ) );
be_bryan	0:b74591d5ab33	2428	#else
be_bryan	0:b74591d5ab33	2429	if( ( ret = ssl->conf->f_rng( ssl->conf->p_rng, p, 4 ) ) != 0 )
be_bryan	0:b74591d5ab33	2430	return( ret );
be_bryan	0:b74591d5ab33	2431
be_bryan	0:b74591d5ab33	2432	p += 4;
be_bryan	0:b74591d5ab33	2433	#endif /* MBEDTLS_HAVE_TIME */
be_bryan	0:b74591d5ab33	2434
be_bryan	0:b74591d5ab33	2435	if( ( ret = ssl->conf->f_rng( ssl->conf->p_rng, p, 28 ) ) != 0 )
be_bryan	0:b74591d5ab33	2436	return( ret );
be_bryan	0:b74591d5ab33	2437
be_bryan	0:b74591d5ab33	2438	p += 28;
be_bryan	0:b74591d5ab33	2439
be_bryan	0:b74591d5ab33	2440	memcpy( ssl->handshake->randbytes + 32, buf + 6, 32 );
be_bryan	0:b74591d5ab33	2441
be_bryan	0:b74591d5ab33	2442	MBEDTLS_SSL_DEBUG_BUF( 3, "server hello, random bytes", buf + 6, 32 );
be_bryan	0:b74591d5ab33	2443
be_bryan	0:b74591d5ab33	2444	/*
be_bryan	0:b74591d5ab33	2445	* Resume is 0 by default, see ssl_handshake_init().
be_bryan	0:b74591d5ab33	2446	* It may be already set to 1 by ssl_parse_session_ticket_ext().
be_bryan	0:b74591d5ab33	2447	* If not, try looking up session ID in our cache.
be_bryan	0:b74591d5ab33	2448	*/
be_bryan	0:b74591d5ab33	2449	if( ssl->handshake->resume == 0 &&
be_bryan	0:b74591d5ab33	2450	#if defined(MBEDTLS_SSL_RENEGOTIATION)
be_bryan	0:b74591d5ab33	2451	ssl->renego_status == MBEDTLS_SSL_INITIAL_HANDSHAKE &&
be_bryan	0:b74591d5ab33	2452	#endif
be_bryan	0:b74591d5ab33	2453	ssl->session_negotiate->id_len != 0 &&
be_bryan	0:b74591d5ab33	2454	ssl->conf->f_get_cache != NULL &&
be_bryan	0:b74591d5ab33	2455	ssl->conf->f_get_cache( ssl->conf->p_cache, ssl->session_negotiate ) == 0 )
be_bryan	0:b74591d5ab33	2456	{
be_bryan	0:b74591d5ab33	2457	MBEDTLS_SSL_DEBUG_MSG( 3, ( "session successfully restored from cache" ) );
be_bryan	0:b74591d5ab33	2458	ssl->handshake->resume = 1;
be_bryan	0:b74591d5ab33	2459	}
be_bryan	0:b74591d5ab33	2460
be_bryan	0:b74591d5ab33	2461	if( ssl->handshake->resume == 0 )
be_bryan	0:b74591d5ab33	2462	{
be_bryan	0:b74591d5ab33	2463	/*
be_bryan	0:b74591d5ab33	2464	* New session, create a new session id,
be_bryan	0:b74591d5ab33	2465	* unless we're about to issue a session ticket
be_bryan	0:b74591d5ab33	2466	*/
be_bryan	0:b74591d5ab33	2467	ssl->state++;
be_bryan	0:b74591d5ab33	2468
be_bryan	0:b74591d5ab33	2469	#if defined(MBEDTLS_HAVE_TIME)
be_bryan	0:b74591d5ab33	2470	ssl->session_negotiate->start = mbedtls_time( NULL );
be_bryan	0:b74591d5ab33	2471	#endif
be_bryan	0:b74591d5ab33	2472
be_bryan	0:b74591d5ab33	2473	#if defined(MBEDTLS_SSL_SESSION_TICKETS)
be_bryan	0:b74591d5ab33	2474	if( ssl->handshake->new_session_ticket != 0 )
be_bryan	0:b74591d5ab33	2475	{
be_bryan	0:b74591d5ab33	2476	ssl->session_negotiate->id_len = n = 0;
be_bryan	0:b74591d5ab33	2477	memset( ssl->session_negotiate->id, 0, 32 );
be_bryan	0:b74591d5ab33	2478	}
be_bryan	0:b74591d5ab33	2479	else
be_bryan	0:b74591d5ab33	2480	#endif /* MBEDTLS_SSL_SESSION_TICKETS */
be_bryan	0:b74591d5ab33	2481	{
be_bryan	0:b74591d5ab33	2482	ssl->session_negotiate->id_len = n = 32;
be_bryan	0:b74591d5ab33	2483	if( ( ret = ssl->conf->f_rng( ssl->conf->p_rng, ssl->session_negotiate->id,
be_bryan	0:b74591d5ab33	2484	n ) ) != 0 )
be_bryan	0:b74591d5ab33	2485	return( ret );
be_bryan	0:b74591d5ab33	2486	}
be_bryan	0:b74591d5ab33	2487	}
be_bryan	0:b74591d5ab33	2488	else
be_bryan	0:b74591d5ab33	2489	{
be_bryan	0:b74591d5ab33	2490	/*
be_bryan	0:b74591d5ab33	2491	* Resuming a session
be_bryan	0:b74591d5ab33	2492	*/
be_bryan	0:b74591d5ab33	2493	n = ssl->session_negotiate->id_len;
be_bryan	0:b74591d5ab33	2494	ssl->state = MBEDTLS_SSL_SERVER_CHANGE_CIPHER_SPEC;
be_bryan	0:b74591d5ab33	2495
be_bryan	0:b74591d5ab33	2496	if( ( ret = mbedtls_ssl_derive_keys( ssl ) ) != 0 )
be_bryan	0:b74591d5ab33	2497	{
be_bryan	0:b74591d5ab33	2498	MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_derive_keys", ret );
be_bryan	0:b74591d5ab33	2499	return( ret );
be_bryan	0:b74591d5ab33	2500	}
be_bryan	0:b74591d5ab33	2501	}
be_bryan	0:b74591d5ab33	2502
be_bryan	0:b74591d5ab33	2503	/*
be_bryan	0:b74591d5ab33	2504	* 38 . 38 session id length
be_bryan	0:b74591d5ab33	2505	* 39 . 38+n session id
be_bryan	0:b74591d5ab33	2506	* 39+n . 40+n chosen ciphersuite
be_bryan	0:b74591d5ab33	2507	* 41+n . 41+n chosen compression alg.
be_bryan	0:b74591d5ab33	2508	* 42+n . 43+n extensions length
be_bryan	0:b74591d5ab33	2509	* 44+n . 43+n+m extensions
be_bryan	0:b74591d5ab33	2510	*/
be_bryan	0:b74591d5ab33	2511	*p++ = (unsigned char) ssl->session_negotiate->id_len;
be_bryan	0:b74591d5ab33	2512	memcpy( p, ssl->session_negotiate->id, ssl->session_negotiate->id_len );
be_bryan	0:b74591d5ab33	2513	p += ssl->session_negotiate->id_len;
be_bryan	0:b74591d5ab33	2514
be_bryan	0:b74591d5ab33	2515	MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, session id len.: %d", n ) );
be_bryan	0:b74591d5ab33	2516	MBEDTLS_SSL_DEBUG_BUF( 3, "server hello, session id", buf + 39, n );
be_bryan	0:b74591d5ab33	2517	MBEDTLS_SSL_DEBUG_MSG( 3, ( "%s session has been resumed",
be_bryan	0:b74591d5ab33	2518	ssl->handshake->resume ? "a" : "no" ) );
be_bryan	0:b74591d5ab33	2519
be_bryan	0:b74591d5ab33	2520	*p++ = (unsigned char)( ssl->session_negotiate->ciphersuite >> 8 );
be_bryan	0:b74591d5ab33	2521	*p++ = (unsigned char)( ssl->session_negotiate->ciphersuite );
be_bryan	0:b74591d5ab33	2522	*p++ = (unsigned char)( ssl->session_negotiate->compression );
be_bryan	0:b74591d5ab33	2523
be_bryan	0:b74591d5ab33	2524	MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, chosen ciphersuite: %s",
be_bryan	0:b74591d5ab33	2525	mbedtls_ssl_get_ciphersuite_name( ssl->session_negotiate->ciphersuite ) ) );
be_bryan	0:b74591d5ab33	2526	MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, compress alg.: 0x%02X",
be_bryan	0:b74591d5ab33	2527	ssl->session_negotiate->compression ) );
be_bryan	0:b74591d5ab33	2528
be_bryan	0:b74591d5ab33	2529	/* Do not write the extensions if the protocol is SSLv3 */
be_bryan	0:b74591d5ab33	2530	#if defined(MBEDTLS_SSL_PROTO_SSL3)
be_bryan	0:b74591d5ab33	2531	if( ( ssl->major_ver != 3 ) \|\| ( ssl->minor_ver != 0 ) )
be_bryan	0:b74591d5ab33	2532	{
be_bryan	0:b74591d5ab33	2533	#endif
be_bryan	0:b74591d5ab33	2534
be_bryan	0:b74591d5ab33	2535	/*
be_bryan	0:b74591d5ab33	2536	* First write extensions, then the total length
be_bryan	0:b74591d5ab33	2537	*/
be_bryan	0:b74591d5ab33	2538	ssl_write_renegotiation_ext( ssl, p + 2 + ext_len, &olen );
be_bryan	0:b74591d5ab33	2539	ext_len += olen;
be_bryan	0:b74591d5ab33	2540
be_bryan	0:b74591d5ab33	2541	#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
be_bryan	0:b74591d5ab33	2542	ssl_write_max_fragment_length_ext( ssl, p + 2 + ext_len, &olen );
be_bryan	0:b74591d5ab33	2543	ext_len += olen;
be_bryan	0:b74591d5ab33	2544	#endif
be_bryan	0:b74591d5ab33	2545
be_bryan	0:b74591d5ab33	2546	#if defined(MBEDTLS_SSL_TRUNCATED_HMAC)
be_bryan	0:b74591d5ab33	2547	ssl_write_truncated_hmac_ext( ssl, p + 2 + ext_len, &olen );
be_bryan	0:b74591d5ab33	2548	ext_len += olen;
be_bryan	0:b74591d5ab33	2549	#endif
be_bryan	0:b74591d5ab33	2550
be_bryan	0:b74591d5ab33	2551	#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
be_bryan	0:b74591d5ab33	2552	ssl_write_encrypt_then_mac_ext( ssl, p + 2 + ext_len, &olen );
be_bryan	0:b74591d5ab33	2553	ext_len += olen;
be_bryan	0:b74591d5ab33	2554	#endif
be_bryan	0:b74591d5ab33	2555
be_bryan	0:b74591d5ab33	2556	#if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET)
be_bryan	0:b74591d5ab33	2557	ssl_write_extended_ms_ext( ssl, p + 2 + ext_len, &olen );
be_bryan	0:b74591d5ab33	2558	ext_len += olen;
be_bryan	0:b74591d5ab33	2559	#endif
be_bryan	0:b74591d5ab33	2560
be_bryan	0:b74591d5ab33	2561	#if defined(MBEDTLS_SSL_SESSION_TICKETS)
be_bryan	0:b74591d5ab33	2562	ssl_write_session_ticket_ext( ssl, p + 2 + ext_len, &olen );
be_bryan	0:b74591d5ab33	2563	ext_len += olen;
be_bryan	0:b74591d5ab33	2564	#endif
be_bryan	0:b74591d5ab33	2565
be_bryan	0:b74591d5ab33	2566	#if defined(MBEDTLS_ECDH_C) \|\| defined(MBEDTLS_ECDSA_C) \|\| \
be_bryan	0:b74591d5ab33	2567	defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
be_bryan	0:b74591d5ab33	2568	ssl_write_supported_point_formats_ext( ssl, p + 2 + ext_len, &olen );
be_bryan	0:b74591d5ab33	2569	ext_len += olen;
be_bryan	0:b74591d5ab33	2570	#endif
be_bryan	0:b74591d5ab33	2571
be_bryan	0:b74591d5ab33	2572	#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
be_bryan	0:b74591d5ab33	2573	ssl_write_ecjpake_kkpp_ext( ssl, p + 2 + ext_len, &olen );
be_bryan	0:b74591d5ab33	2574	ext_len += olen;
be_bryan	0:b74591d5ab33	2575	#endif
be_bryan	0:b74591d5ab33	2576
be_bryan	0:b74591d5ab33	2577	#if defined(MBEDTLS_SSL_ALPN)
be_bryan	0:b74591d5ab33	2578	ssl_write_alpn_ext( ssl, p + 2 + ext_len, &olen );
be_bryan	0:b74591d5ab33	2579	ext_len += olen;
be_bryan	0:b74591d5ab33	2580	#endif
be_bryan	0:b74591d5ab33	2581
be_bryan	0:b74591d5ab33	2582	MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, total extension length: %d", ext_len ) );
be_bryan	0:b74591d5ab33	2583
be_bryan	0:b74591d5ab33	2584	if( ext_len > 0 )
be_bryan	0:b74591d5ab33	2585	{
be_bryan	0:b74591d5ab33	2586	*p++ = (unsigned char)( ( ext_len >> 8 ) & 0xFF );
be_bryan	0:b74591d5ab33	2587	*p++ = (unsigned char)( ( ext_len ) & 0xFF );
be_bryan	0:b74591d5ab33	2588	p += ext_len;
be_bryan	0:b74591d5ab33	2589	}
be_bryan	0:b74591d5ab33	2590
be_bryan	0:b74591d5ab33	2591	#if defined(MBEDTLS_SSL_PROTO_SSL3)
be_bryan	0:b74591d5ab33	2592	}
be_bryan	0:b74591d5ab33	2593	#endif
be_bryan	0:b74591d5ab33	2594
be_bryan	0:b74591d5ab33	2595	ssl->out_msglen = p - buf;
be_bryan	0:b74591d5ab33	2596	ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE;
be_bryan	0:b74591d5ab33	2597	ssl->out_msg[0] = MBEDTLS_SSL_HS_SERVER_HELLO;
be_bryan	0:b74591d5ab33	2598
be_bryan	0:b74591d5ab33	2599	ret = mbedtls_ssl_write_record( ssl );
be_bryan	0:b74591d5ab33	2600
be_bryan	0:b74591d5ab33	2601	MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write server hello" ) );
be_bryan	0:b74591d5ab33	2602
be_bryan	0:b74591d5ab33	2603	return( ret );
be_bryan	0:b74591d5ab33	2604	}
be_bryan	0:b74591d5ab33	2605
be_bryan	0:b74591d5ab33	2606	#if !defined(MBEDTLS_KEY_EXCHANGE_RSA_ENABLED) && \
be_bryan	0:b74591d5ab33	2607	!defined(MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED) && \
be_bryan	0:b74591d5ab33	2608	!defined(MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED) && \
be_bryan	0:b74591d5ab33	2609	!defined(MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED) && \
be_bryan	0:b74591d5ab33	2610	!defined(MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED)&& \
be_bryan	0:b74591d5ab33	2611	!defined(MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED)
be_bryan	0:b74591d5ab33	2612	static int ssl_write_certificate_request( mbedtls_ssl_context *ssl )
be_bryan	0:b74591d5ab33	2613	{
be_bryan	0:b74591d5ab33	2614	const mbedtls_ssl_ciphersuite_t *ciphersuite_info =
be_bryan	0:b74591d5ab33	2615	ssl->transform_negotiate->ciphersuite_info;
be_bryan	0:b74591d5ab33	2616
be_bryan	0:b74591d5ab33	2617	MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write certificate request" ) );
be_bryan	0:b74591d5ab33	2618
be_bryan	0:b74591d5ab33	2619	if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_PSK \|\|
be_bryan	0:b74591d5ab33	2620	ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA_PSK \|\|
be_bryan	0:b74591d5ab33	2621	ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_PSK \|\|
be_bryan	0:b74591d5ab33	2622	ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_PSK \|\|
be_bryan	0:b74591d5ab33	2623	ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECJPAKE )
be_bryan	0:b74591d5ab33	2624	{
be_bryan	0:b74591d5ab33	2625	MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip write certificate request" ) );
be_bryan	0:b74591d5ab33	2626	ssl->state++;
be_bryan	0:b74591d5ab33	2627	return( 0 );
be_bryan	0:b74591d5ab33	2628	}
be_bryan	0:b74591d5ab33	2629
be_bryan	0:b74591d5ab33	2630	MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
be_bryan	0:b74591d5ab33	2631	return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
be_bryan	0:b74591d5ab33	2632	}
be_bryan	0:b74591d5ab33	2633	#else
be_bryan	0:b74591d5ab33	2634	static int ssl_write_certificate_request( mbedtls_ssl_context *ssl )
be_bryan	0:b74591d5ab33	2635	{
be_bryan	0:b74591d5ab33	2636	int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE;
be_bryan	0:b74591d5ab33	2637	const mbedtls_ssl_ciphersuite_t *ciphersuite_info =
be_bryan	0:b74591d5ab33	2638	ssl->transform_negotiate->ciphersuite_info;
be_bryan	0:b74591d5ab33	2639	size_t dn_size, total_dn_size; /* excluding length bytes */
be_bryan	0:b74591d5ab33	2640	size_t ct_len, sa_len; /* including length bytes */
be_bryan	0:b74591d5ab33	2641	unsigned char buf, p;
be_bryan	0:b74591d5ab33	2642	const unsigned char * const end = ssl->out_msg + MBEDTLS_SSL_MAX_CONTENT_LEN;
be_bryan	0:b74591d5ab33	2643	const mbedtls_x509_crt *crt;
be_bryan	0:b74591d5ab33	2644	int authmode;
be_bryan	0:b74591d5ab33	2645
be_bryan	0:b74591d5ab33	2646	MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write certificate request" ) );
be_bryan	0:b74591d5ab33	2647
be_bryan	0:b74591d5ab33	2648	ssl->state++;
be_bryan	0:b74591d5ab33	2649
be_bryan	0:b74591d5ab33	2650	#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
be_bryan	0:b74591d5ab33	2651	if( ssl->handshake->sni_authmode != MBEDTLS_SSL_VERIFY_UNSET )
be_bryan	0:b74591d5ab33	2652	authmode = ssl->handshake->sni_authmode;
be_bryan	0:b74591d5ab33	2653	else
be_bryan	0:b74591d5ab33	2654	#endif
be_bryan	0:b74591d5ab33	2655	authmode = ssl->conf->authmode;
be_bryan	0:b74591d5ab33	2656
be_bryan	0:b74591d5ab33	2657	if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_PSK \|\|
be_bryan	0:b74591d5ab33	2658	ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA_PSK \|\|
be_bryan	0:b74591d5ab33	2659	ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_PSK \|\|
be_bryan	0:b74591d5ab33	2660	ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_PSK \|\|
be_bryan	0:b74591d5ab33	2661	ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECJPAKE \|\|
be_bryan	0:b74591d5ab33	2662	authmode == MBEDTLS_SSL_VERIFY_NONE )
be_bryan	0:b74591d5ab33	2663	{
be_bryan	0:b74591d5ab33	2664	MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip write certificate request" ) );
be_bryan	0:b74591d5ab33	2665	return( 0 );
be_bryan	0:b74591d5ab33	2666	}
be_bryan	0:b74591d5ab33	2667
be_bryan	0:b74591d5ab33	2668	/*
be_bryan	0:b74591d5ab33	2669	* 0 . 0 handshake type
be_bryan	0:b74591d5ab33	2670	* 1 . 3 handshake length
be_bryan	0:b74591d5ab33	2671	* 4 . 4 cert type count
be_bryan	0:b74591d5ab33	2672	* 5 .. m-1 cert types
be_bryan	0:b74591d5ab33	2673	* m .. m+1 sig alg length (TLS 1.2 only)
be_bryan	0:b74591d5ab33	2674	* m+1 .. n-1 SignatureAndHashAlgorithms (TLS 1.2 only)
be_bryan	0:b74591d5ab33	2675	* n .. n+1 length of all DNs
be_bryan	0:b74591d5ab33	2676	* n+2 .. n+3 length of DN 1
be_bryan	0:b74591d5ab33	2677	* n+4 .. ... Distinguished Name #1
be_bryan	0:b74591d5ab33	2678	* ... .. ... length of DN 2, etc.
be_bryan	0:b74591d5ab33	2679	*/
be_bryan	0:b74591d5ab33	2680	buf = ssl->out_msg;
be_bryan	0:b74591d5ab33	2681	p = buf + 4;
be_bryan	0:b74591d5ab33	2682
be_bryan	0:b74591d5ab33	2683	/*
be_bryan	0:b74591d5ab33	2684	* Supported certificate types
be_bryan	0:b74591d5ab33	2685	*
be_bryan	0:b74591d5ab33	2686	* ClientCertificateType certificate_types<1..2^8-1>;
be_bryan	0:b74591d5ab33	2687	* enum { (255) } ClientCertificateType;
be_bryan	0:b74591d5ab33	2688	*/
be_bryan	0:b74591d5ab33	2689	ct_len = 0;
be_bryan	0:b74591d5ab33	2690
be_bryan	0:b74591d5ab33	2691	#if defined(MBEDTLS_RSA_C)
be_bryan	0:b74591d5ab33	2692	p[1 + ct_len++] = MBEDTLS_SSL_CERT_TYPE_RSA_SIGN;
be_bryan	0:b74591d5ab33	2693	#endif
be_bryan	0:b74591d5ab33	2694	#if defined(MBEDTLS_ECDSA_C)
be_bryan	0:b74591d5ab33	2695	p[1 + ct_len++] = MBEDTLS_SSL_CERT_TYPE_ECDSA_SIGN;
be_bryan	0:b74591d5ab33	2696	#endif
be_bryan	0:b74591d5ab33	2697
be_bryan	0:b74591d5ab33	2698	p[0] = (unsigned char) ct_len++;
be_bryan	0:b74591d5ab33	2699	p += ct_len;
be_bryan	0:b74591d5ab33	2700
be_bryan	0:b74591d5ab33	2701	sa_len = 0;
be_bryan	0:b74591d5ab33	2702	#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
be_bryan	0:b74591d5ab33	2703	/*
be_bryan	0:b74591d5ab33	2704	* Add signature_algorithms for verify (TLS 1.2)
be_bryan	0:b74591d5ab33	2705	*
be_bryan	0:b74591d5ab33	2706	* SignatureAndHashAlgorithm supported_signature_algorithms<2..2^16-2>;
be_bryan	0:b74591d5ab33	2707	*
be_bryan	0:b74591d5ab33	2708	* struct {
be_bryan	0:b74591d5ab33	2709	* HashAlgorithm hash;
be_bryan	0:b74591d5ab33	2710	* SignatureAlgorithm signature;
be_bryan	0:b74591d5ab33	2711	* } SignatureAndHashAlgorithm;
be_bryan	0:b74591d5ab33	2712	*
be_bryan	0:b74591d5ab33	2713	* enum { (255) } HashAlgorithm;
be_bryan	0:b74591d5ab33	2714	* enum { (255) } SignatureAlgorithm;
be_bryan	0:b74591d5ab33	2715	*/
be_bryan	0:b74591d5ab33	2716	if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 )
be_bryan	0:b74591d5ab33	2717	{
be_bryan	0:b74591d5ab33	2718	const int *cur;
be_bryan	0:b74591d5ab33	2719
be_bryan	0:b74591d5ab33	2720	/*
be_bryan	0:b74591d5ab33	2721	* Supported signature algorithms
be_bryan	0:b74591d5ab33	2722	*/
be_bryan	0:b74591d5ab33	2723	for( cur = ssl->conf->sig_hashes; *cur != MBEDTLS_MD_NONE; cur++ )
be_bryan	0:b74591d5ab33	2724	{
be_bryan	0:b74591d5ab33	2725	unsigned char hash = mbedtls_ssl_hash_from_md_alg( *cur );
be_bryan	0:b74591d5ab33	2726
be_bryan	0:b74591d5ab33	2727	if( MBEDTLS_SSL_HASH_NONE == hash \|\| mbedtls_ssl_set_calc_verify_md( ssl, hash ) )
be_bryan	0:b74591d5ab33	2728	continue;
be_bryan	0:b74591d5ab33	2729
be_bryan	0:b74591d5ab33	2730	#if defined(MBEDTLS_RSA_C)
be_bryan	0:b74591d5ab33	2731	p[2 + sa_len++] = hash;
be_bryan	0:b74591d5ab33	2732	p[2 + sa_len++] = MBEDTLS_SSL_SIG_RSA;
be_bryan	0:b74591d5ab33	2733	#endif
be_bryan	0:b74591d5ab33	2734	#if defined(MBEDTLS_ECDSA_C)
be_bryan	0:b74591d5ab33	2735	p[2 + sa_len++] = hash;
be_bryan	0:b74591d5ab33	2736	p[2 + sa_len++] = MBEDTLS_SSL_SIG_ECDSA;
be_bryan	0:b74591d5ab33	2737	#endif
be_bryan	0:b74591d5ab33	2738	}
be_bryan	0:b74591d5ab33	2739
be_bryan	0:b74591d5ab33	2740	p[0] = (unsigned char)( sa_len >> 8 );
be_bryan	0:b74591d5ab33	2741	p[1] = (unsigned char)( sa_len );
be_bryan	0:b74591d5ab33	2742	sa_len += 2;
be_bryan	0:b74591d5ab33	2743	p += sa_len;
be_bryan	0:b74591d5ab33	2744	}
be_bryan	0:b74591d5ab33	2745	#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
be_bryan	0:b74591d5ab33	2746
be_bryan	0:b74591d5ab33	2747	/*
be_bryan	0:b74591d5ab33	2748	* DistinguishedName certificate_authorities<0..2^16-1>;
be_bryan	0:b74591d5ab33	2749	* opaque DistinguishedName<1..2^16-1>;
be_bryan	0:b74591d5ab33	2750	*/
be_bryan	0:b74591d5ab33	2751	p += 2;
be_bryan	0:b74591d5ab33	2752
be_bryan	0:b74591d5ab33	2753	total_dn_size = 0;
be_bryan	0:b74591d5ab33	2754
be_bryan	0:b74591d5ab33	2755	if( ssl->conf->cert_req_ca_list == MBEDTLS_SSL_CERT_REQ_CA_LIST_ENABLED )
be_bryan	0:b74591d5ab33	2756	{
be_bryan	0:b74591d5ab33	2757	#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
be_bryan	0:b74591d5ab33	2758	if( ssl->handshake->sni_ca_chain != NULL )
be_bryan	0:b74591d5ab33	2759	crt = ssl->handshake->sni_ca_chain;
be_bryan	0:b74591d5ab33	2760	else
be_bryan	0:b74591d5ab33	2761	#endif
be_bryan	0:b74591d5ab33	2762	crt = ssl->conf->ca_chain;
be_bryan	0:b74591d5ab33	2763
be_bryan	0:b74591d5ab33	2764	while( crt != NULL && crt->version != 0 )
be_bryan	0:b74591d5ab33	2765	{
be_bryan	0:b74591d5ab33	2766	dn_size = crt->subject_raw.len;
be_bryan	0:b74591d5ab33	2767
be_bryan	0:b74591d5ab33	2768	if( end < p \|\|
be_bryan	0:b74591d5ab33	2769	(size_t)( end - p ) < dn_size \|\|
be_bryan	0:b74591d5ab33	2770	(size_t)( end - p ) < 2 + dn_size )
be_bryan	0:b74591d5ab33	2771	{
be_bryan	0:b74591d5ab33	2772	MBEDTLS_SSL_DEBUG_MSG( 1, ( "skipping CAs: buffer too short" ) );
be_bryan	0:b74591d5ab33	2773	break;
be_bryan	0:b74591d5ab33	2774	}
be_bryan	0:b74591d5ab33	2775
be_bryan	0:b74591d5ab33	2776	*p++ = (unsigned char)( dn_size >> 8 );
be_bryan	0:b74591d5ab33	2777	*p++ = (unsigned char)( dn_size );
be_bryan	0:b74591d5ab33	2778	memcpy( p, crt->subject_raw.p, dn_size );
be_bryan	0:b74591d5ab33	2779	p += dn_size;
be_bryan	0:b74591d5ab33	2780
be_bryan	0:b74591d5ab33	2781	MBEDTLS_SSL_DEBUG_BUF( 3, "requested DN", p - dn_size, dn_size );
be_bryan	0:b74591d5ab33	2782
be_bryan	0:b74591d5ab33	2783	total_dn_size += 2 + dn_size;
be_bryan	0:b74591d5ab33	2784	crt = crt->next;
be_bryan	0:b74591d5ab33	2785	}
be_bryan	0:b74591d5ab33	2786	}
be_bryan	0:b74591d5ab33	2787
be_bryan	0:b74591d5ab33	2788	ssl->out_msglen = p - buf;
be_bryan	0:b74591d5ab33	2789	ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE;
be_bryan	0:b74591d5ab33	2790	ssl->out_msg[0] = MBEDTLS_SSL_HS_CERTIFICATE_REQUEST;
be_bryan	0:b74591d5ab33	2791	ssl->out_msg[4 + ct_len + sa_len] = (unsigned char)( total_dn_size >> 8 );
be_bryan	0:b74591d5ab33	2792	ssl->out_msg[5 + ct_len + sa_len] = (unsigned char)( total_dn_size );
be_bryan	0:b74591d5ab33	2793
be_bryan	0:b74591d5ab33	2794	ret = mbedtls_ssl_write_record( ssl );
be_bryan	0:b74591d5ab33	2795
be_bryan	0:b74591d5ab33	2796	MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write certificate request" ) );
be_bryan	0:b74591d5ab33	2797
be_bryan	0:b74591d5ab33	2798	return( ret );
be_bryan	0:b74591d5ab33	2799	}
be_bryan	0:b74591d5ab33	2800	#endif /* !MBEDTLS_KEY_EXCHANGE_RSA_ENABLED &&
be_bryan	0:b74591d5ab33	2801	!MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED &&
be_bryan	0:b74591d5ab33	2802	!MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED &&
be_bryan	0:b74591d5ab33	2803	!MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED &&
be_bryan	0:b74591d5ab33	2804	!MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED &&
be_bryan	0:b74591d5ab33	2805	!MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED */
be_bryan	0:b74591d5ab33	2806
be_bryan	0:b74591d5ab33	2807	#if defined(MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED) \|\| \
be_bryan	0:b74591d5ab33	2808	defined(MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED)
be_bryan	0:b74591d5ab33	2809	static int ssl_get_ecdh_params_from_cert( mbedtls_ssl_context *ssl )
be_bryan	0:b74591d5ab33	2810	{
be_bryan	0:b74591d5ab33	2811	int ret;
be_bryan	0:b74591d5ab33	2812
be_bryan	0:b74591d5ab33	2813	if( ! mbedtls_pk_can_do( mbedtls_ssl_own_key( ssl ), MBEDTLS_PK_ECKEY ) )
be_bryan	0:b74591d5ab33	2814	{
be_bryan	0:b74591d5ab33	2815	MBEDTLS_SSL_DEBUG_MSG( 1, ( "server key not ECDH capable" ) );
be_bryan	0:b74591d5ab33	2816	return( MBEDTLS_ERR_SSL_PK_TYPE_MISMATCH );
be_bryan	0:b74591d5ab33	2817	}
be_bryan	0:b74591d5ab33	2818
be_bryan	0:b74591d5ab33	2819	if( ( ret = mbedtls_ecdh_get_params( &ssl->handshake->ecdh_ctx,
be_bryan	0:b74591d5ab33	2820	mbedtls_pk_ec( *mbedtls_ssl_own_key( ssl ) ),
be_bryan	0:b74591d5ab33	2821	MBEDTLS_ECDH_OURS ) ) != 0 )
be_bryan	0:b74591d5ab33	2822	{
be_bryan	0:b74591d5ab33	2823	MBEDTLS_SSL_DEBUG_RET( 1, ( "mbedtls_ecdh_get_params" ), ret );
be_bryan	0:b74591d5ab33	2824	return( ret );
be_bryan	0:b74591d5ab33	2825	}
be_bryan	0:b74591d5ab33	2826
be_bryan	0:b74591d5ab33	2827	return( 0 );
be_bryan	0:b74591d5ab33	2828	}
be_bryan	0:b74591d5ab33	2829	#endif /* MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED) \|\|
be_bryan	0:b74591d5ab33	2830	MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED */
be_bryan	0:b74591d5ab33	2831
be_bryan	0:b74591d5ab33	2832	static int ssl_write_server_key_exchange( mbedtls_ssl_context *ssl )
be_bryan	0:b74591d5ab33	2833	{
be_bryan	0:b74591d5ab33	2834	int ret;
be_bryan	0:b74591d5ab33	2835	size_t n = 0;
be_bryan	0:b74591d5ab33	2836	const mbedtls_ssl_ciphersuite_t *ciphersuite_info =
be_bryan	0:b74591d5ab33	2837	ssl->transform_negotiate->ciphersuite_info;
be_bryan	0:b74591d5ab33	2838
be_bryan	0:b74591d5ab33	2839	#if defined(MBEDTLS_KEY_EXCHANGE__SOME_PFS__ENABLED)
be_bryan	0:b74591d5ab33	2840	unsigned char *p = ssl->out_msg + 4;
be_bryan	0:b74591d5ab33	2841	size_t len;
be_bryan	0:b74591d5ab33	2842	#if defined(MBEDTLS_KEY_EXCHANGE__WITH_SERVER_SIGNATURE__ENABLED)
be_bryan	0:b74591d5ab33	2843	unsigned char *dig_signed = p;
be_bryan	0:b74591d5ab33	2844	size_t dig_signed_len = 0;
be_bryan	0:b74591d5ab33	2845	#endif /* MBEDTLS_KEY_EXCHANGE__WITH_SERVER_SIGNATURE__ENABLED */
be_bryan	0:b74591d5ab33	2846	#endif /* MBEDTLS_KEY_EXCHANGE__SOME_PFS__ENABLED */
be_bryan	0:b74591d5ab33	2847
be_bryan	0:b74591d5ab33	2848	MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write server key exchange" ) );
be_bryan	0:b74591d5ab33	2849
be_bryan	0:b74591d5ab33	2850	/*
be_bryan	0:b74591d5ab33	2851	*
be_bryan	0:b74591d5ab33	2852	* Part 1: Extract static ECDH parameters and abort
be_bryan	0:b74591d5ab33	2853	* if ServerKeyExchange not needed.
be_bryan	0:b74591d5ab33	2854	*
be_bryan	0:b74591d5ab33	2855	*/
be_bryan	0:b74591d5ab33	2856
be_bryan	0:b74591d5ab33	2857	/* For suites involving ECDH, extract DH parameters
be_bryan	0:b74591d5ab33	2858	* from certificate at this point. */
be_bryan	0:b74591d5ab33	2859	#if defined(MBEDTLS_KEY_EXCHANGE__SOME__ECDH_ENABLED)
be_bryan	0:b74591d5ab33	2860	if( mbedtls_ssl_ciphersuite_uses_ecdh( ciphersuite_info ) )
be_bryan	0:b74591d5ab33	2861	{
be_bryan	0:b74591d5ab33	2862	ssl_get_ecdh_params_from_cert( ssl );
be_bryan	0:b74591d5ab33	2863	}
be_bryan	0:b74591d5ab33	2864	#endif /* MBEDTLS_KEY_EXCHANGE__SOME__ECDH_ENABLED */
be_bryan	0:b74591d5ab33	2865
be_bryan	0:b74591d5ab33	2866	/* Key exchanges not involving ephemeral keys don't use
be_bryan	0:b74591d5ab33	2867	* ServerKeyExchange, so end here. */
be_bryan	0:b74591d5ab33	2868	#if defined(MBEDTLS_KEY_EXCHANGE__SOME_NON_PFS__ENABLED)
be_bryan	0:b74591d5ab33	2869	if( mbedtls_ssl_ciphersuite_no_pfs( ciphersuite_info ) )
be_bryan	0:b74591d5ab33	2870	{
be_bryan	0:b74591d5ab33	2871	MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip write server key exchange" ) );
be_bryan	0:b74591d5ab33	2872	ssl->state++;
be_bryan	0:b74591d5ab33	2873	return( 0 );
be_bryan	0:b74591d5ab33	2874	}
be_bryan	0:b74591d5ab33	2875	#endif /* MBEDTLS_KEY_EXCHANGE__NON_PFS__ENABLED */
be_bryan	0:b74591d5ab33	2876
be_bryan	0:b74591d5ab33	2877	/*
be_bryan	0:b74591d5ab33	2878	*
be_bryan	0:b74591d5ab33	2879	* Part 2: Provide key exchange parameters for chosen ciphersuite.
be_bryan	0:b74591d5ab33	2880	*
be_bryan	0:b74591d5ab33	2881	*/
be_bryan	0:b74591d5ab33	2882
be_bryan	0:b74591d5ab33	2883	/*
be_bryan	0:b74591d5ab33	2884	* - ECJPAKE key exchanges
be_bryan	0:b74591d5ab33	2885	*/
be_bryan	0:b74591d5ab33	2886	#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
be_bryan	0:b74591d5ab33	2887	if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECJPAKE )
be_bryan	0:b74591d5ab33	2888	{
be_bryan	0:b74591d5ab33	2889	const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_MAX_CONTENT_LEN;
be_bryan	0:b74591d5ab33	2890
be_bryan	0:b74591d5ab33	2891	ret = mbedtls_ecjpake_write_round_two( &ssl->handshake->ecjpake_ctx,
be_bryan	0:b74591d5ab33	2892	p, end - p, &len, ssl->conf->f_rng, ssl->conf->p_rng );
be_bryan	0:b74591d5ab33	2893	if( ret != 0 )
be_bryan	0:b74591d5ab33	2894	{
be_bryan	0:b74591d5ab33	2895	MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecjpake_write_round_two", ret );
be_bryan	0:b74591d5ab33	2896	return( ret );
be_bryan	0:b74591d5ab33	2897	}
be_bryan	0:b74591d5ab33	2898
be_bryan	0:b74591d5ab33	2899	p += len;
be_bryan	0:b74591d5ab33	2900	n += len;
be_bryan	0:b74591d5ab33	2901	}
be_bryan	0:b74591d5ab33	2902	#endif /* MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */
be_bryan	0:b74591d5ab33	2903
be_bryan	0:b74591d5ab33	2904	/*
be_bryan	0:b74591d5ab33	2905	* For (EC)DHE key exchanges with PSK, parameters are prefixed by support
be_bryan	0:b74591d5ab33	2906	* identity hint (RFC 4279, Sec. 3). Until someone needs this feature,
be_bryan	0:b74591d5ab33	2907	* we use empty support identity hints here.
be_bryan	0:b74591d5ab33	2908	**/
be_bryan	0:b74591d5ab33	2909	#if defined(MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED) \|\| \
be_bryan	0:b74591d5ab33	2910	defined(MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED)
be_bryan	0:b74591d5ab33	2911	if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_PSK \|\|
be_bryan	0:b74591d5ab33	2912	ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_PSK )
be_bryan	0:b74591d5ab33	2913	{
be_bryan	0:b74591d5ab33	2914	*(p++) = 0x00;
be_bryan	0:b74591d5ab33	2915	*(p++) = 0x00;
be_bryan	0:b74591d5ab33	2916
be_bryan	0:b74591d5ab33	2917	n += 2;
be_bryan	0:b74591d5ab33	2918	}
be_bryan	0:b74591d5ab33	2919	#endif /* MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED \|\|
be_bryan	0:b74591d5ab33	2920	MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED */
be_bryan	0:b74591d5ab33	2921
be_bryan	0:b74591d5ab33	2922	/*
be_bryan	0:b74591d5ab33	2923	* - DHE key exchanges
be_bryan	0:b74591d5ab33	2924	*/
be_bryan	0:b74591d5ab33	2925	#if defined(MBEDTLS_KEY_EXCHANGE__SOME__DHE_ENABLED)
be_bryan	0:b74591d5ab33	2926	if( mbedtls_ssl_ciphersuite_uses_dhe( ciphersuite_info ) )
be_bryan	0:b74591d5ab33	2927	{
be_bryan	0:b74591d5ab33	2928	if( ssl->conf->dhm_P.p == NULL \|\| ssl->conf->dhm_G.p == NULL )
be_bryan	0:b74591d5ab33	2929	{
be_bryan	0:b74591d5ab33	2930	MBEDTLS_SSL_DEBUG_MSG( 1, ( "no DH parameters set" ) );
be_bryan	0:b74591d5ab33	2931	return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
be_bryan	0:b74591d5ab33	2932	}
be_bryan	0:b74591d5ab33	2933
be_bryan	0:b74591d5ab33	2934	/*
be_bryan	0:b74591d5ab33	2935	* Ephemeral DH parameters:
be_bryan	0:b74591d5ab33	2936	*
be_bryan	0:b74591d5ab33	2937	* struct {
be_bryan	0:b74591d5ab33	2938	* opaque dh_p<1..2^16-1>;
be_bryan	0:b74591d5ab33	2939	* opaque dh_g<1..2^16-1>;
be_bryan	0:b74591d5ab33	2940	* opaque dh_Ys<1..2^16-1>;
be_bryan	0:b74591d5ab33	2941	* } ServerDHParams;
be_bryan	0:b74591d5ab33	2942	*/
be_bryan	0:b74591d5ab33	2943	if( ( ret = mbedtls_mpi_copy( &ssl->handshake->dhm_ctx.P, &ssl->conf->dhm_P ) ) != 0 \|\|
be_bryan	0:b74591d5ab33	2944	( ret = mbedtls_mpi_copy( &ssl->handshake->dhm_ctx.G, &ssl->conf->dhm_G ) ) != 0 )
be_bryan	0:b74591d5ab33	2945	{
be_bryan	0:b74591d5ab33	2946	MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_mpi_copy", ret );
be_bryan	0:b74591d5ab33	2947	return( ret );
be_bryan	0:b74591d5ab33	2948	}
be_bryan	0:b74591d5ab33	2949
be_bryan	0:b74591d5ab33	2950	if( ( ret = mbedtls_dhm_make_params( &ssl->handshake->dhm_ctx,
be_bryan	0:b74591d5ab33	2951	(int) mbedtls_mpi_size( &ssl->handshake->dhm_ctx.P ),
be_bryan	0:b74591d5ab33	2952	p, &len, ssl->conf->f_rng, ssl->conf->p_rng ) ) != 0 )
be_bryan	0:b74591d5ab33	2953	{
be_bryan	0:b74591d5ab33	2954	MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_dhm_make_params", ret );
be_bryan	0:b74591d5ab33	2955	return( ret );
be_bryan	0:b74591d5ab33	2956	}
be_bryan	0:b74591d5ab33	2957
be_bryan	0:b74591d5ab33	2958	#if defined(MBEDTLS_KEY_EXCHANGE__WITH_SERVER_SIGNATURE__ENABLED)
be_bryan	0:b74591d5ab33	2959	dig_signed = p;
be_bryan	0:b74591d5ab33	2960	dig_signed_len = len;
be_bryan	0:b74591d5ab33	2961	#endif
be_bryan	0:b74591d5ab33	2962
be_bryan	0:b74591d5ab33	2963	p += len;
be_bryan	0:b74591d5ab33	2964	n += len;
be_bryan	0:b74591d5ab33	2965
be_bryan	0:b74591d5ab33	2966	MBEDTLS_SSL_DEBUG_MPI( 3, "DHM: X ", &ssl->handshake->dhm_ctx.X );
be_bryan	0:b74591d5ab33	2967	MBEDTLS_SSL_DEBUG_MPI( 3, "DHM: P ", &ssl->handshake->dhm_ctx.P );
be_bryan	0:b74591d5ab33	2968	MBEDTLS_SSL_DEBUG_MPI( 3, "DHM: G ", &ssl->handshake->dhm_ctx.G );
be_bryan	0:b74591d5ab33	2969	MBEDTLS_SSL_DEBUG_MPI( 3, "DHM: GX", &ssl->handshake->dhm_ctx.GX );
be_bryan	0:b74591d5ab33	2970	}
be_bryan	0:b74591d5ab33	2971	#endif /* MBEDTLS_KEY_EXCHANGE__SOME__DHE_ENABLED */
be_bryan	0:b74591d5ab33	2972
be_bryan	0:b74591d5ab33	2973	/*
be_bryan	0:b74591d5ab33	2974	* - ECDHE key exchanges
be_bryan	0:b74591d5ab33	2975	*/
be_bryan	0:b74591d5ab33	2976	#if defined(MBEDTLS_KEY_EXCHANGE__SOME__ECDHE_ENABLED)
be_bryan	0:b74591d5ab33	2977	if( mbedtls_ssl_ciphersuite_uses_ecdhe( ciphersuite_info ) )
be_bryan	0:b74591d5ab33	2978	{
be_bryan	0:b74591d5ab33	2979	/*
be_bryan	0:b74591d5ab33	2980	* Ephemeral ECDH parameters:
be_bryan	0:b74591d5ab33	2981	*
be_bryan	0:b74591d5ab33	2982	* struct {
be_bryan	0:b74591d5ab33	2983	* ECParameters curve_params;
be_bryan	0:b74591d5ab33	2984	* ECPoint public;
be_bryan	0:b74591d5ab33	2985	* } ServerECDHParams;
be_bryan	0:b74591d5ab33	2986	*/
be_bryan	0:b74591d5ab33	2987	const mbedtls_ecp_curve_info **curve = NULL;
be_bryan	0:b74591d5ab33	2988	const mbedtls_ecp_group_id *gid;
be_bryan	0:b74591d5ab33	2989
be_bryan	0:b74591d5ab33	2990	/* Match our preference list against the offered curves */
be_bryan	0:b74591d5ab33	2991	for( gid = ssl->conf->curve_list; *gid != MBEDTLS_ECP_DP_NONE; gid++ )
be_bryan	0:b74591d5ab33	2992	for( curve = ssl->handshake->curves; *curve != NULL; curve++ )
be_bryan	0:b74591d5ab33	2993	if( (curve)->grp_id == gid )
be_bryan	0:b74591d5ab33	2994	goto curve_matching_done;
be_bryan	0:b74591d5ab33	2995
be_bryan	0:b74591d5ab33	2996	curve_matching_done:
be_bryan	0:b74591d5ab33	2997	if( curve == NULL \|\| *curve == NULL )
be_bryan	0:b74591d5ab33	2998	{
be_bryan	0:b74591d5ab33	2999	MBEDTLS_SSL_DEBUG_MSG( 1, ( "no matching curve for ECDHE" ) );
be_bryan	0:b74591d5ab33	3000	return( MBEDTLS_ERR_SSL_NO_CIPHER_CHOSEN );
be_bryan	0:b74591d5ab33	3001	}
be_bryan	0:b74591d5ab33	3002
be_bryan	0:b74591d5ab33	3003	MBEDTLS_SSL_DEBUG_MSG( 2, ( "ECDHE curve: %s", (*curve)->name ) );
be_bryan	0:b74591d5ab33	3004
be_bryan	0:b74591d5ab33	3005	if( ( ret = mbedtls_ecp_group_load( &ssl->handshake->ecdh_ctx.grp,
be_bryan	0:b74591d5ab33	3006	(*curve)->grp_id ) ) != 0 )
be_bryan	0:b74591d5ab33	3007	{
be_bryan	0:b74591d5ab33	3008	MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecp_group_load", ret );
be_bryan	0:b74591d5ab33	3009	return( ret );
be_bryan	0:b74591d5ab33	3010	}
be_bryan	0:b74591d5ab33	3011
be_bryan	0:b74591d5ab33	3012	if( ( ret = mbedtls_ecdh_make_params( &ssl->handshake->ecdh_ctx, &len,
be_bryan	0:b74591d5ab33	3013	p, MBEDTLS_SSL_MAX_CONTENT_LEN - n,
be_bryan	0:b74591d5ab33	3014	ssl->conf->f_rng, ssl->conf->p_rng ) ) != 0 )
be_bryan	0:b74591d5ab33	3015	{
be_bryan	0:b74591d5ab33	3016	MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecdh_make_params", ret );
be_bryan	0:b74591d5ab33	3017	return( ret );
be_bryan	0:b74591d5ab33	3018	}
be_bryan	0:b74591d5ab33	3019
be_bryan	0:b74591d5ab33	3020	#if defined(MBEDTLS_KEY_EXCHANGE__WITH_SERVER_SIGNATURE__ENABLED)
be_bryan	0:b74591d5ab33	3021	dig_signed = p;
be_bryan	0:b74591d5ab33	3022	dig_signed_len = len;
be_bryan	0:b74591d5ab33	3023	#endif
be_bryan	0:b74591d5ab33	3024
be_bryan	0:b74591d5ab33	3025	p += len;
be_bryan	0:b74591d5ab33	3026	n += len;
be_bryan	0:b74591d5ab33	3027
be_bryan	0:b74591d5ab33	3028	MBEDTLS_SSL_DEBUG_ECP( 3, "ECDH: Q ", &ssl->handshake->ecdh_ctx.Q );
be_bryan	0:b74591d5ab33	3029	}
be_bryan	0:b74591d5ab33	3030	#endif /* MBEDTLS_KEY_EXCHANGE__SOME__ECDHE_ENABLED */
be_bryan	0:b74591d5ab33	3031
be_bryan	0:b74591d5ab33	3032	/*
be_bryan	0:b74591d5ab33	3033	*
be_bryan	0:b74591d5ab33	3034	* Part 3: For key exchanges involving the server signing the
be_bryan	0:b74591d5ab33	3035	* exchange parameters, compute and add the signature here.
be_bryan	0:b74591d5ab33	3036	*
be_bryan	0:b74591d5ab33	3037	*/
be_bryan	0:b74591d5ab33	3038	#if defined(MBEDTLS_KEY_EXCHANGE__WITH_SERVER_SIGNATURE__ENABLED)
be_bryan	0:b74591d5ab33	3039	if( mbedtls_ssl_ciphersuite_uses_server_signature( ciphersuite_info ) )
be_bryan	0:b74591d5ab33	3040	{
be_bryan	0:b74591d5ab33	3041	size_t signature_len = 0;
be_bryan	0:b74591d5ab33	3042	unsigned int hashlen = 0;
be_bryan	0:b74591d5ab33	3043	unsigned char hash[64];
be_bryan	0:b74591d5ab33	3044
be_bryan	0:b74591d5ab33	3045	/*
be_bryan	0:b74591d5ab33	3046	* 3.1: Choose hash algorithm:
be_bryan	0:b74591d5ab33	3047	* A: For TLS 1.2, obey signature-hash-algorithm extension
be_bryan	0:b74591d5ab33	3048	* to choose appropriate hash.
be_bryan	0:b74591d5ab33	3049	* B: For SSL3, TLS1.0, TLS1.1 and ECDHE_ECDSA, use SHA1
be_bryan	0:b74591d5ab33	3050	* (RFC 4492, Sec. 5.4)
be_bryan	0:b74591d5ab33	3051	* C: Otherwise, use MD5 + SHA1 (RFC 4346, Sec. 7.4.3)
be_bryan	0:b74591d5ab33	3052	*/
be_bryan	0:b74591d5ab33	3053
be_bryan	0:b74591d5ab33	3054	mbedtls_md_type_t md_alg;
be_bryan	0:b74591d5ab33	3055
be_bryan	0:b74591d5ab33	3056	#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
be_bryan	0:b74591d5ab33	3057	mbedtls_pk_type_t sig_alg =
be_bryan	0:b74591d5ab33	3058	mbedtls_ssl_get_ciphersuite_sig_pk_alg( ciphersuite_info );
be_bryan	0:b74591d5ab33	3059	if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 )
be_bryan	0:b74591d5ab33	3060	{
be_bryan	0:b74591d5ab33	3061	/* A: For TLS 1.2, obey signature-hash-algorithm extension
be_bryan	0:b74591d5ab33	3062	* (RFC 5246, Sec. 7.4.1.4.1). */
be_bryan	0:b74591d5ab33	3063	if( sig_alg == MBEDTLS_PK_NONE \|\|
be_bryan	0:b74591d5ab33	3064	( md_alg = mbedtls_ssl_sig_hash_set_find( &ssl->handshake->hash_algs,
be_bryan	0:b74591d5ab33	3065	sig_alg ) ) == MBEDTLS_MD_NONE )
be_bryan	0:b74591d5ab33	3066	{
be_bryan	0:b74591d5ab33	3067	MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
be_bryan	0:b74591d5ab33	3068	/* (... because we choose a cipher suite
be_bryan	0:b74591d5ab33	3069	* only if there is a matching hash.) */
be_bryan	0:b74591d5ab33	3070	return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
be_bryan	0:b74591d5ab33	3071	}
be_bryan	0:b74591d5ab33	3072	}
be_bryan	0:b74591d5ab33	3073	else
be_bryan	0:b74591d5ab33	3074	#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
be_bryan	0:b74591d5ab33	3075	#if defined(MBEDTLS_SSL_PROTO_SSL3) \|\| defined(MBEDTLS_SSL_PROTO_TLS1) \|\| \
be_bryan	0:b74591d5ab33	3076	defined(MBEDTLS_SSL_PROTO_TLS1_1)
be_bryan	0:b74591d5ab33	3077	if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA )
be_bryan	0:b74591d5ab33	3078	{
be_bryan	0:b74591d5ab33	3079	/* B: Default hash SHA1 */
be_bryan	0:b74591d5ab33	3080	md_alg = MBEDTLS_MD_SHA1;
be_bryan	0:b74591d5ab33	3081	}
be_bryan	0:b74591d5ab33	3082	else
be_bryan	0:b74591d5ab33	3083	#endif /* MBEDTLS_SSL_PROTO_SSL3 \|\| MBEDTLS_SSL_PROTO_TLS1 \|\| \
be_bryan	0:b74591d5ab33	3084	MBEDTLS_SSL_PROTO_TLS1_1 */
be_bryan	0:b74591d5ab33	3085	{
be_bryan	0:b74591d5ab33	3086	/* C: MD5 + SHA1 */
be_bryan	0:b74591d5ab33	3087	md_alg = MBEDTLS_MD_NONE;
be_bryan	0:b74591d5ab33	3088	}
be_bryan	0:b74591d5ab33	3089
be_bryan	0:b74591d5ab33	3090	MBEDTLS_SSL_DEBUG_MSG( 3, ( "pick hash algorithm %d for signing", md_alg ) );
be_bryan	0:b74591d5ab33	3091
be_bryan	0:b74591d5ab33	3092	/*
be_bryan	0:b74591d5ab33	3093	* 3.2: Compute the hash to be signed
be_bryan	0:b74591d5ab33	3094	*/
be_bryan	0:b74591d5ab33	3095	#if defined(MBEDTLS_SSL_PROTO_SSL3) \|\| defined(MBEDTLS_SSL_PROTO_TLS1) \|\| \
be_bryan	0:b74591d5ab33	3096	defined(MBEDTLS_SSL_PROTO_TLS1_1)
be_bryan	0:b74591d5ab33	3097	if( md_alg == MBEDTLS_MD_NONE )
be_bryan	0:b74591d5ab33	3098	{
be_bryan	0:b74591d5ab33	3099	mbedtls_md5_context mbedtls_md5;
be_bryan	0:b74591d5ab33	3100	mbedtls_sha1_context mbedtls_sha1;
be_bryan	0:b74591d5ab33	3101
be_bryan	0:b74591d5ab33	3102	mbedtls_md5_init( &mbedtls_md5 );
be_bryan	0:b74591d5ab33	3103	mbedtls_sha1_init( &mbedtls_sha1 );
be_bryan	0:b74591d5ab33	3104
be_bryan	0:b74591d5ab33	3105	/*
be_bryan	0:b74591d5ab33	3106	* digitally-signed struct {
be_bryan	0:b74591d5ab33	3107	* opaque md5_hash[16];
be_bryan	0:b74591d5ab33	3108	* opaque sha_hash[20];
be_bryan	0:b74591d5ab33	3109	* };
be_bryan	0:b74591d5ab33	3110	*
be_bryan	0:b74591d5ab33	3111	* md5_hash
be_bryan	0:b74591d5ab33	3112	* MD5(ClientHello.random + ServerHello.random
be_bryan	0:b74591d5ab33	3113	* + ServerParams);
be_bryan	0:b74591d5ab33	3114	* sha_hash
be_bryan	0:b74591d5ab33	3115	* SHA(ClientHello.random + ServerHello.random
be_bryan	0:b74591d5ab33	3116	* + ServerParams);
be_bryan	0:b74591d5ab33	3117	*/
be_bryan	0:b74591d5ab33	3118
be_bryan	0:b74591d5ab33	3119	mbedtls_md5_starts( &mbedtls_md5 );
be_bryan	0:b74591d5ab33	3120	mbedtls_md5_update( &mbedtls_md5, ssl->handshake->randbytes, 64 );
be_bryan	0:b74591d5ab33	3121	mbedtls_md5_update( &mbedtls_md5, dig_signed, dig_signed_len );
be_bryan	0:b74591d5ab33	3122	mbedtls_md5_finish( &mbedtls_md5, hash );
be_bryan	0:b74591d5ab33	3123
be_bryan	0:b74591d5ab33	3124	mbedtls_sha1_starts( &mbedtls_sha1 );
be_bryan	0:b74591d5ab33	3125	mbedtls_sha1_update( &mbedtls_sha1, ssl->handshake->randbytes, 64 );
be_bryan	0:b74591d5ab33	3126	mbedtls_sha1_update( &mbedtls_sha1, dig_signed, dig_signed_len );
be_bryan	0:b74591d5ab33	3127	mbedtls_sha1_finish( &mbedtls_sha1, hash + 16 );
be_bryan	0:b74591d5ab33	3128
be_bryan	0:b74591d5ab33	3129	hashlen = 36;
be_bryan	0:b74591d5ab33	3130
be_bryan	0:b74591d5ab33	3131	mbedtls_md5_free( &mbedtls_md5 );
be_bryan	0:b74591d5ab33	3132	mbedtls_sha1_free( &mbedtls_sha1 );
be_bryan	0:b74591d5ab33	3133	}
be_bryan	0:b74591d5ab33	3134	else
be_bryan	0:b74591d5ab33	3135	#endif /* MBEDTLS_SSL_PROTO_SSL3 \|\| MBEDTLS_SSL_PROTO_TLS1 \|\| \
be_bryan	0:b74591d5ab33	3136	MBEDTLS_SSL_PROTO_TLS1_1 */
be_bryan	0:b74591d5ab33	3137	#if defined(MBEDTLS_SSL_PROTO_TLS1) \|\| defined(MBEDTLS_SSL_PROTO_TLS1_1) \|\| \
be_bryan	0:b74591d5ab33	3138	defined(MBEDTLS_SSL_PROTO_TLS1_2)
be_bryan	0:b74591d5ab33	3139	if( md_alg != MBEDTLS_MD_NONE )
be_bryan	0:b74591d5ab33	3140	{
be_bryan	0:b74591d5ab33	3141	mbedtls_md_context_t ctx;
be_bryan	0:b74591d5ab33	3142	const mbedtls_md_info_t *md_info = mbedtls_md_info_from_type( md_alg );
be_bryan	0:b74591d5ab33	3143
be_bryan	0:b74591d5ab33	3144	mbedtls_md_init( &ctx );
be_bryan	0:b74591d5ab33	3145
be_bryan	0:b74591d5ab33	3146	/* Info from md_alg will be used instead */
be_bryan	0:b74591d5ab33	3147	hashlen = 0;
be_bryan	0:b74591d5ab33	3148
be_bryan	0:b74591d5ab33	3149	/*
be_bryan	0:b74591d5ab33	3150	* digitally-signed struct {
be_bryan	0:b74591d5ab33	3151	* opaque client_random[32];
be_bryan	0:b74591d5ab33	3152	* opaque server_random[32];
be_bryan	0:b74591d5ab33	3153	* ServerDHParams params;
be_bryan	0:b74591d5ab33	3154	* };
be_bryan	0:b74591d5ab33	3155	*/
be_bryan	0:b74591d5ab33	3156	if( ( ret = mbedtls_md_setup( &ctx, md_info, 0 ) ) != 0 )
be_bryan	0:b74591d5ab33	3157	{
be_bryan	0:b74591d5ab33	3158	MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_md_setup", ret );
be_bryan	0:b74591d5ab33	3159	return( ret );
be_bryan	0:b74591d5ab33	3160	}
be_bryan	0:b74591d5ab33	3161
be_bryan	0:b74591d5ab33	3162	mbedtls_md_starts( &ctx );
be_bryan	0:b74591d5ab33	3163	mbedtls_md_update( &ctx, ssl->handshake->randbytes, 64 );
be_bryan	0:b74591d5ab33	3164	mbedtls_md_update( &ctx, dig_signed, dig_signed_len );
be_bryan	0:b74591d5ab33	3165	mbedtls_md_finish( &ctx, hash );
be_bryan	0:b74591d5ab33	3166	mbedtls_md_free( &ctx );
be_bryan	0:b74591d5ab33	3167	}
be_bryan	0:b74591d5ab33	3168	else
be_bryan	0:b74591d5ab33	3169	#endif /* MBEDTLS_SSL_PROTO_TLS1 \|\| MBEDTLS_SSL_PROTO_TLS1_1 \|\| \
be_bryan	0:b74591d5ab33	3170	MBEDTLS_SSL_PROTO_TLS1_2 */
be_bryan	0:b74591d5ab33	3171	{
be_bryan	0:b74591d5ab33	3172	MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
be_bryan	0:b74591d5ab33	3173	return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
be_bryan	0:b74591d5ab33	3174	}
be_bryan	0:b74591d5ab33	3175
be_bryan	0:b74591d5ab33	3176	MBEDTLS_SSL_DEBUG_BUF( 3, "parameters hash", hash, hashlen != 0 ? hashlen :
be_bryan	0:b74591d5ab33	3177	(unsigned int) ( mbedtls_md_get_size( mbedtls_md_info_from_type( md_alg ) ) ) );
be_bryan	0:b74591d5ab33	3178
be_bryan	0:b74591d5ab33	3179	/*
be_bryan	0:b74591d5ab33	3180	* 3.3: Compute and add the signature
be_bryan	0:b74591d5ab33	3181	*/
be_bryan	0:b74591d5ab33	3182	if( mbedtls_ssl_own_key( ssl ) == NULL )
be_bryan	0:b74591d5ab33	3183	{
be_bryan	0:b74591d5ab33	3184	MBEDTLS_SSL_DEBUG_MSG( 1, ( "got no private key" ) );
be_bryan	0:b74591d5ab33	3185	return( MBEDTLS_ERR_SSL_PRIVATE_KEY_REQUIRED );
be_bryan	0:b74591d5ab33	3186	}
be_bryan	0:b74591d5ab33	3187
be_bryan	0:b74591d5ab33	3188	#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
be_bryan	0:b74591d5ab33	3189	if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 )
be_bryan	0:b74591d5ab33	3190	{
be_bryan	0:b74591d5ab33	3191	/*
be_bryan	0:b74591d5ab33	3192	* For TLS 1.2, we need to specify signature and hash algorithm
be_bryan	0:b74591d5ab33	3193	* explicitly through a prefix to the signature.
be_bryan	0:b74591d5ab33	3194	*
be_bryan	0:b74591d5ab33	3195	* struct {
be_bryan	0:b74591d5ab33	3196	* HashAlgorithm hash;
be_bryan	0:b74591d5ab33	3197	* SignatureAlgorithm signature;
be_bryan	0:b74591d5ab33	3198	* } SignatureAndHashAlgorithm;
be_bryan	0:b74591d5ab33	3199	*
be_bryan	0:b74591d5ab33	3200	* struct {
be_bryan	0:b74591d5ab33	3201	* SignatureAndHashAlgorithm algorithm;
be_bryan	0:b74591d5ab33	3202	* opaque signature<0..2^16-1>;
be_bryan	0:b74591d5ab33	3203	* } DigitallySigned;
be_bryan	0:b74591d5ab33	3204	*
be_bryan	0:b74591d5ab33	3205	*/
be_bryan	0:b74591d5ab33	3206
be_bryan	0:b74591d5ab33	3207	*(p++) = mbedtls_ssl_hash_from_md_alg( md_alg );
be_bryan	0:b74591d5ab33	3208	*(p++) = mbedtls_ssl_sig_from_pk_alg( sig_alg );
be_bryan	0:b74591d5ab33	3209
be_bryan	0:b74591d5ab33	3210	n += 2;
be_bryan	0:b74591d5ab33	3211	}
be_bryan	0:b74591d5ab33	3212	#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
be_bryan	0:b74591d5ab33	3213
be_bryan	0:b74591d5ab33	3214	if( ( ret = mbedtls_pk_sign( mbedtls_ssl_own_key( ssl ), md_alg, hash, hashlen,
be_bryan	0:b74591d5ab33	3215	p + 2 , &signature_len, ssl->conf->f_rng, ssl->conf->p_rng ) ) != 0 )
be_bryan	0:b74591d5ab33	3216	{
be_bryan	0:b74591d5ab33	3217	MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_pk_sign", ret );
be_bryan	0:b74591d5ab33	3218	return( ret );
be_bryan	0:b74591d5ab33	3219	}
be_bryan	0:b74591d5ab33	3220
be_bryan	0:b74591d5ab33	3221	*(p++) = (unsigned char)( signature_len >> 8 );
be_bryan	0:b74591d5ab33	3222	*(p++) = (unsigned char)( signature_len );
be_bryan	0:b74591d5ab33	3223	n += 2;
be_bryan	0:b74591d5ab33	3224
be_bryan	0:b74591d5ab33	3225	MBEDTLS_SSL_DEBUG_BUF( 3, "my signature", p, signature_len );
be_bryan	0:b74591d5ab33	3226
be_bryan	0:b74591d5ab33	3227	n += signature_len;
be_bryan	0:b74591d5ab33	3228	}
be_bryan	0:b74591d5ab33	3229	#endif /* MBEDTLS_KEY_EXCHANGE__WITH_SERVER_SIGNATURE__ENABLED */
be_bryan	0:b74591d5ab33	3230
be_bryan	0:b74591d5ab33	3231	/* Done with actual work; add header and send. */
be_bryan	0:b74591d5ab33	3232
be_bryan	0:b74591d5ab33	3233	ssl->out_msglen = 4 + n;
be_bryan	0:b74591d5ab33	3234	ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE;
be_bryan	0:b74591d5ab33	3235	ssl->out_msg[0] = MBEDTLS_SSL_HS_SERVER_KEY_EXCHANGE;
be_bryan	0:b74591d5ab33	3236
be_bryan	0:b74591d5ab33	3237	ssl->state++;
be_bryan	0:b74591d5ab33	3238
be_bryan	0:b74591d5ab33	3239	if( ( ret = mbedtls_ssl_write_record( ssl ) ) != 0 )
be_bryan	0:b74591d5ab33	3240	{
be_bryan	0:b74591d5ab33	3241	MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_record", ret );
be_bryan	0:b74591d5ab33	3242	return( ret );
be_bryan	0:b74591d5ab33	3243	}
be_bryan	0:b74591d5ab33	3244
be_bryan	0:b74591d5ab33	3245	MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write server key exchange" ) );
be_bryan	0:b74591d5ab33	3246
be_bryan	0:b74591d5ab33	3247	return( 0 );
be_bryan	0:b74591d5ab33	3248	}
be_bryan	0:b74591d5ab33	3249
be_bryan	0:b74591d5ab33	3250	static int ssl_write_server_hello_done( mbedtls_ssl_context *ssl )
be_bryan	0:b74591d5ab33	3251	{
be_bryan	0:b74591d5ab33	3252	int ret;
be_bryan	0:b74591d5ab33	3253
be_bryan	0:b74591d5ab33	3254	MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write server hello done" ) );
be_bryan	0:b74591d5ab33	3255
be_bryan	0:b74591d5ab33	3256	ssl->out_msglen = 4;
be_bryan	0:b74591d5ab33	3257	ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE;
be_bryan	0:b74591d5ab33	3258	ssl->out_msg[0] = MBEDTLS_SSL_HS_SERVER_HELLO_DONE;
be_bryan	0:b74591d5ab33	3259
be_bryan	0:b74591d5ab33	3260	ssl->state++;
be_bryan	0:b74591d5ab33	3261
be_bryan	0:b74591d5ab33	3262	#if defined(MBEDTLS_SSL_PROTO_DTLS)
be_bryan	0:b74591d5ab33	3263	if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
be_bryan	0:b74591d5ab33	3264	mbedtls_ssl_send_flight_completed( ssl );
be_bryan	0:b74591d5ab33	3265	#endif
be_bryan	0:b74591d5ab33	3266
be_bryan	0:b74591d5ab33	3267	if( ( ret = mbedtls_ssl_write_record( ssl ) ) != 0 )
be_bryan	0:b74591d5ab33	3268	{
be_bryan	0:b74591d5ab33	3269	MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_record", ret );
be_bryan	0:b74591d5ab33	3270	return( ret );
be_bryan	0:b74591d5ab33	3271	}
be_bryan	0:b74591d5ab33	3272
be_bryan	0:b74591d5ab33	3273	MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write server hello done" ) );
be_bryan	0:b74591d5ab33	3274
be_bryan	0:b74591d5ab33	3275	return( 0 );
be_bryan	0:b74591d5ab33	3276	}
be_bryan	0:b74591d5ab33	3277
be_bryan	0:b74591d5ab33	3278	#if defined(MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED) \|\| \
be_bryan	0:b74591d5ab33	3279	defined(MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED)
be_bryan	0:b74591d5ab33	3280	static int ssl_parse_client_dh_public( mbedtls_ssl_context ssl, unsigned char *p,
be_bryan	0:b74591d5ab33	3281	const unsigned char *end )
be_bryan	0:b74591d5ab33	3282	{
be_bryan	0:b74591d5ab33	3283	int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE;
be_bryan	0:b74591d5ab33	3284	size_t n;
be_bryan	0:b74591d5ab33	3285
be_bryan	0:b74591d5ab33	3286	/*
be_bryan	0:b74591d5ab33	3287	* Receive G^Y mod P, premaster = (G^Y)^X mod P
be_bryan	0:b74591d5ab33	3288	*/
be_bryan	0:b74591d5ab33	3289	if( *p + 2 > end )
be_bryan	0:b74591d5ab33	3290	{
be_bryan	0:b74591d5ab33	3291	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) );
be_bryan	0:b74591d5ab33	3292	return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE );
be_bryan	0:b74591d5ab33	3293	}
be_bryan	0:b74591d5ab33	3294
be_bryan	0:b74591d5ab33	3295	n = ( (p)[0] << 8 ) \| (p)[1];
be_bryan	0:b74591d5ab33	3296	*p += 2;
be_bryan	0:b74591d5ab33	3297
be_bryan	0:b74591d5ab33	3298	if( *p + n > end )
be_bryan	0:b74591d5ab33	3299	{
be_bryan	0:b74591d5ab33	3300	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) );
be_bryan	0:b74591d5ab33	3301	return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE );
be_bryan	0:b74591d5ab33	3302	}
be_bryan	0:b74591d5ab33	3303
be_bryan	0:b74591d5ab33	3304	if( ( ret = mbedtls_dhm_read_public( &ssl->handshake->dhm_ctx, *p, n ) ) != 0 )
be_bryan	0:b74591d5ab33	3305	{
be_bryan	0:b74591d5ab33	3306	MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_dhm_read_public", ret );
be_bryan	0:b74591d5ab33	3307	return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE_RP );
be_bryan	0:b74591d5ab33	3308	}
be_bryan	0:b74591d5ab33	3309
be_bryan	0:b74591d5ab33	3310	*p += n;
be_bryan	0:b74591d5ab33	3311
be_bryan	0:b74591d5ab33	3312	MBEDTLS_SSL_DEBUG_MPI( 3, "DHM: GY", &ssl->handshake->dhm_ctx.GY );
be_bryan	0:b74591d5ab33	3313
be_bryan	0:b74591d5ab33	3314	return( ret );
be_bryan	0:b74591d5ab33	3315	}
be_bryan	0:b74591d5ab33	3316	#endif /* MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED \|\|
be_bryan	0:b74591d5ab33	3317	MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED */
be_bryan	0:b74591d5ab33	3318
be_bryan	0:b74591d5ab33	3319	#if defined(MBEDTLS_KEY_EXCHANGE_RSA_ENABLED) \|\| \
be_bryan	0:b74591d5ab33	3320	defined(MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED)
be_bryan	0:b74591d5ab33	3321	static int ssl_parse_encrypted_pms( mbedtls_ssl_context *ssl,
be_bryan	0:b74591d5ab33	3322	const unsigned char *p,
be_bryan	0:b74591d5ab33	3323	const unsigned char *end,
be_bryan	0:b74591d5ab33	3324	size_t pms_offset )
be_bryan	0:b74591d5ab33	3325	{
be_bryan	0:b74591d5ab33	3326	int ret;
be_bryan	0:b74591d5ab33	3327	size_t len = mbedtls_pk_get_len( mbedtls_ssl_own_key( ssl ) );
be_bryan	0:b74591d5ab33	3328	unsigned char *pms = ssl->handshake->premaster + pms_offset;
be_bryan	0:b74591d5ab33	3329	unsigned char ver[2];
be_bryan	0:b74591d5ab33	3330	unsigned char fake_pms[48], peer_pms[48];
be_bryan	0:b74591d5ab33	3331	unsigned char mask;
be_bryan	0:b74591d5ab33	3332	size_t i, peer_pmslen;
be_bryan	0:b74591d5ab33	3333	unsigned int diff;
be_bryan	0:b74591d5ab33	3334
be_bryan	0:b74591d5ab33	3335	if( ! mbedtls_pk_can_do( mbedtls_ssl_own_key( ssl ), MBEDTLS_PK_RSA ) )
be_bryan	0:b74591d5ab33	3336	{
be_bryan	0:b74591d5ab33	3337	MBEDTLS_SSL_DEBUG_MSG( 1, ( "got no RSA private key" ) );
be_bryan	0:b74591d5ab33	3338	return( MBEDTLS_ERR_SSL_PRIVATE_KEY_REQUIRED );
be_bryan	0:b74591d5ab33	3339	}
be_bryan	0:b74591d5ab33	3340
be_bryan	0:b74591d5ab33	3341	/*
be_bryan	0:b74591d5ab33	3342	* Decrypt the premaster using own private RSA key
be_bryan	0:b74591d5ab33	3343	*/
be_bryan	0:b74591d5ab33	3344	#if defined(MBEDTLS_SSL_PROTO_TLS1) \|\| defined(MBEDTLS_SSL_PROTO_TLS1_1) \|\| \
be_bryan	0:b74591d5ab33	3345	defined(MBEDTLS_SSL_PROTO_TLS1_2)
be_bryan	0:b74591d5ab33	3346	if( ssl->minor_ver != MBEDTLS_SSL_MINOR_VERSION_0 )
be_bryan	0:b74591d5ab33	3347	{
be_bryan	0:b74591d5ab33	3348	if( *p++ != ( ( len >> 8 ) & 0xFF ) \|\|
be_bryan	0:b74591d5ab33	3349	*p++ != ( ( len ) & 0xFF ) )
be_bryan	0:b74591d5ab33	3350	{
be_bryan	0:b74591d5ab33	3351	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) );
be_bryan	0:b74591d5ab33	3352	return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE );
be_bryan	0:b74591d5ab33	3353	}
be_bryan	0:b74591d5ab33	3354	}
be_bryan	0:b74591d5ab33	3355	#endif
be_bryan	0:b74591d5ab33	3356
be_bryan	0:b74591d5ab33	3357	if( p + len != end )
be_bryan	0:b74591d5ab33	3358	{
be_bryan	0:b74591d5ab33	3359	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) );
be_bryan	0:b74591d5ab33	3360	return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE );
be_bryan	0:b74591d5ab33	3361	}
be_bryan	0:b74591d5ab33	3362
be_bryan	0:b74591d5ab33	3363	mbedtls_ssl_write_version( ssl->handshake->max_major_ver,
be_bryan	0:b74591d5ab33	3364	ssl->handshake->max_minor_ver,
be_bryan	0:b74591d5ab33	3365	ssl->conf->transport, ver );
be_bryan	0:b74591d5ab33	3366
be_bryan	0:b74591d5ab33	3367	/*
be_bryan	0:b74591d5ab33	3368	* Protection against Bleichenbacher's attack: invalid PKCS#1 v1.5 padding
be_bryan	0:b74591d5ab33	3369	* must not cause the connection to end immediately; instead, send a
be_bryan	0:b74591d5ab33	3370	* bad_record_mac later in the handshake.
be_bryan	0:b74591d5ab33	3371	* Also, avoid data-dependant branches here to protect against
be_bryan	0:b74591d5ab33	3372	* timing-based variants.
be_bryan	0:b74591d5ab33	3373	*/
be_bryan	0:b74591d5ab33	3374	ret = ssl->conf->f_rng( ssl->conf->p_rng, fake_pms, sizeof( fake_pms ) );
be_bryan	0:b74591d5ab33	3375	if( ret != 0 )
be_bryan	0:b74591d5ab33	3376	return( ret );
be_bryan	0:b74591d5ab33	3377
be_bryan	0:b74591d5ab33	3378	ret = mbedtls_pk_decrypt( mbedtls_ssl_own_key( ssl ), p, len,
be_bryan	0:b74591d5ab33	3379	peer_pms, &peer_pmslen,
be_bryan	0:b74591d5ab33	3380	sizeof( peer_pms ),
be_bryan	0:b74591d5ab33	3381	ssl->conf->f_rng, ssl->conf->p_rng );
be_bryan	0:b74591d5ab33	3382
be_bryan	0:b74591d5ab33	3383	diff = (unsigned int) ret;
be_bryan	0:b74591d5ab33	3384	diff \|= peer_pmslen ^ 48;
be_bryan	0:b74591d5ab33	3385	diff \|= peer_pms[0] ^ ver[0];
be_bryan	0:b74591d5ab33	3386	diff \|= peer_pms[1] ^ ver[1];
be_bryan	0:b74591d5ab33	3387
be_bryan	0:b74591d5ab33	3388	#if defined(MBEDTLS_SSL_DEBUG_ALL)
be_bryan	0:b74591d5ab33	3389	if( diff != 0 )
be_bryan	0:b74591d5ab33	3390	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) );
be_bryan	0:b74591d5ab33	3391	#endif
be_bryan	0:b74591d5ab33	3392
be_bryan	0:b74591d5ab33	3393	if( sizeof( ssl->handshake->premaster ) < pms_offset \|\|
be_bryan	0:b74591d5ab33	3394	sizeof( ssl->handshake->premaster ) - pms_offset < 48 )
be_bryan	0:b74591d5ab33	3395	{
be_bryan	0:b74591d5ab33	3396	MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
be_bryan	0:b74591d5ab33	3397	return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
be_bryan	0:b74591d5ab33	3398	}
be_bryan	0:b74591d5ab33	3399	ssl->handshake->pmslen = 48;
be_bryan	0:b74591d5ab33	3400
be_bryan	0:b74591d5ab33	3401	/* mask = diff ? 0xff : 0x00 using bit operations to avoid branches */
be_bryan	0:b74591d5ab33	3402	/* MSVC has a warning about unary minus on unsigned, but this is
be_bryan	0:b74591d5ab33	3403	* well-defined and precisely what we want to do here */
be_bryan	0:b74591d5ab33	3404	#if defined(_MSC_VER)
be_bryan	0:b74591d5ab33	3405	#pragma warning( push )
be_bryan	0:b74591d5ab33	3406	#pragma warning( disable : 4146 )
be_bryan	0:b74591d5ab33	3407	#endif
be_bryan	0:b74591d5ab33	3408	mask = - ( ( diff \| - diff ) >> ( sizeof( unsigned int ) * 8 - 1 ) );
be_bryan	0:b74591d5ab33	3409	#if defined(_MSC_VER)
be_bryan	0:b74591d5ab33	3410	#pragma warning( pop )
be_bryan	0:b74591d5ab33	3411	#endif
be_bryan	0:b74591d5ab33	3412
be_bryan	0:b74591d5ab33	3413	for( i = 0; i < ssl->handshake->pmslen; i++ )
be_bryan	0:b74591d5ab33	3414	pms[i] = ( mask & fake_pms[i] ) \| ( (~mask) & peer_pms[i] );
be_bryan	0:b74591d5ab33	3415
be_bryan	0:b74591d5ab33	3416	return( 0 );
be_bryan	0:b74591d5ab33	3417	}
be_bryan	0:b74591d5ab33	3418	#endif /* MBEDTLS_KEY_EXCHANGE_RSA_ENABLED \|\|
be_bryan	0:b74591d5ab33	3419	MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED */
be_bryan	0:b74591d5ab33	3420
be_bryan	0:b74591d5ab33	3421	#if defined(MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED)
be_bryan	0:b74591d5ab33	3422	static int ssl_parse_client_psk_identity( mbedtls_ssl_context ssl, unsigned char *p,
be_bryan	0:b74591d5ab33	3423	const unsigned char *end )
be_bryan	0:b74591d5ab33	3424	{
be_bryan	0:b74591d5ab33	3425	int ret = 0;
be_bryan	0:b74591d5ab33	3426	size_t n;
be_bryan	0:b74591d5ab33	3427
be_bryan	0:b74591d5ab33	3428	if( ssl->conf->f_psk == NULL &&
be_bryan	0:b74591d5ab33	3429	( ssl->conf->psk == NULL \|\| ssl->conf->psk_identity == NULL \|\|
be_bryan	0:b74591d5ab33	3430	ssl->conf->psk_identity_len == 0 \|\| ssl->conf->psk_len == 0 ) )
be_bryan	0:b74591d5ab33	3431	{
be_bryan	0:b74591d5ab33	3432	MBEDTLS_SSL_DEBUG_MSG( 1, ( "got no pre-shared key" ) );
be_bryan	0:b74591d5ab33	3433	return( MBEDTLS_ERR_SSL_PRIVATE_KEY_REQUIRED );
be_bryan	0:b74591d5ab33	3434	}
be_bryan	0:b74591d5ab33	3435
be_bryan	0:b74591d5ab33	3436	/*
be_bryan	0:b74591d5ab33	3437	* Receive client pre-shared key identity name
be_bryan	0:b74591d5ab33	3438	*/
be_bryan	0:b74591d5ab33	3439	if( *p + 2 > end )
be_bryan	0:b74591d5ab33	3440	{
be_bryan	0:b74591d5ab33	3441	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) );
be_bryan	0:b74591d5ab33	3442	return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE );
be_bryan	0:b74591d5ab33	3443	}
be_bryan	0:b74591d5ab33	3444
be_bryan	0:b74591d5ab33	3445	n = ( (p)[0] << 8 ) \| (p)[1];
be_bryan	0:b74591d5ab33	3446	*p += 2;
be_bryan	0:b74591d5ab33	3447
be_bryan	0:b74591d5ab33	3448	if( n < 1 \|\| n > 65535 \|\| *p + n > end )
be_bryan	0:b74591d5ab33	3449	{
be_bryan	0:b74591d5ab33	3450	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) );
be_bryan	0:b74591d5ab33	3451	return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE );
be_bryan	0:b74591d5ab33	3452	}
be_bryan	0:b74591d5ab33	3453
be_bryan	0:b74591d5ab33	3454	if( ssl->conf->f_psk != NULL )
be_bryan	0:b74591d5ab33	3455	{
be_bryan	0:b74591d5ab33	3456	if( ssl->conf->f_psk( ssl->conf->p_psk, ssl, *p, n ) != 0 )
be_bryan	0:b74591d5ab33	3457	ret = MBEDTLS_ERR_SSL_UNKNOWN_IDENTITY;
be_bryan	0:b74591d5ab33	3458	}
be_bryan	0:b74591d5ab33	3459	else
be_bryan	0:b74591d5ab33	3460	{
be_bryan	0:b74591d5ab33	3461	/* Identity is not a big secret since clients send it in the clear,
be_bryan	0:b74591d5ab33	3462	* but treat it carefully anyway, just in case */
be_bryan	0:b74591d5ab33	3463	if( n != ssl->conf->psk_identity_len \|\|
be_bryan	0:b74591d5ab33	3464	mbedtls_ssl_safer_memcmp( ssl->conf->psk_identity, *p, n ) != 0 )
be_bryan	0:b74591d5ab33	3465	{
be_bryan	0:b74591d5ab33	3466	ret = MBEDTLS_ERR_SSL_UNKNOWN_IDENTITY;
be_bryan	0:b74591d5ab33	3467	}
be_bryan	0:b74591d5ab33	3468	}
be_bryan	0:b74591d5ab33	3469
be_bryan	0:b74591d5ab33	3470	if( ret == MBEDTLS_ERR_SSL_UNKNOWN_IDENTITY )
be_bryan	0:b74591d5ab33	3471	{
be_bryan	0:b74591d5ab33	3472	MBEDTLS_SSL_DEBUG_BUF( 3, "Unknown PSK identity", *p, n );
be_bryan	0:b74591d5ab33	3473	mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
be_bryan	0:b74591d5ab33	3474	MBEDTLS_SSL_ALERT_MSG_UNKNOWN_PSK_IDENTITY );
be_bryan	0:b74591d5ab33	3475	return( MBEDTLS_ERR_SSL_UNKNOWN_IDENTITY );
be_bryan	0:b74591d5ab33	3476	}
be_bryan	0:b74591d5ab33	3477
be_bryan	0:b74591d5ab33	3478	*p += n;
be_bryan	0:b74591d5ab33	3479
be_bryan	0:b74591d5ab33	3480	return( 0 );
be_bryan	0:b74591d5ab33	3481	}
be_bryan	0:b74591d5ab33	3482	#endif /* MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED */
be_bryan	0:b74591d5ab33	3483
be_bryan	0:b74591d5ab33	3484	static int ssl_parse_client_key_exchange( mbedtls_ssl_context *ssl )
be_bryan	0:b74591d5ab33	3485	{
be_bryan	0:b74591d5ab33	3486	int ret;
be_bryan	0:b74591d5ab33	3487	const mbedtls_ssl_ciphersuite_t *ciphersuite_info;
be_bryan	0:b74591d5ab33	3488	unsigned char p, end;
be_bryan	0:b74591d5ab33	3489
be_bryan	0:b74591d5ab33	3490	ciphersuite_info = ssl->transform_negotiate->ciphersuite_info;
be_bryan	0:b74591d5ab33	3491
be_bryan	0:b74591d5ab33	3492	MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse client key exchange" ) );
be_bryan	0:b74591d5ab33	3493
be_bryan	0:b74591d5ab33	3494	if( ( ret = mbedtls_ssl_read_record( ssl ) ) != 0 )
be_bryan	0:b74591d5ab33	3495	{
be_bryan	0:b74591d5ab33	3496	MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_read_record", ret );
be_bryan	0:b74591d5ab33	3497	return( ret );
be_bryan	0:b74591d5ab33	3498	}
be_bryan	0:b74591d5ab33	3499
be_bryan	0:b74591d5ab33	3500	p = ssl->in_msg + mbedtls_ssl_hs_hdr_len( ssl );
be_bryan	0:b74591d5ab33	3501	end = ssl->in_msg + ssl->in_hslen;
be_bryan	0:b74591d5ab33	3502
be_bryan	0:b74591d5ab33	3503	if( ssl->in_msgtype != MBEDTLS_SSL_MSG_HANDSHAKE )
be_bryan	0:b74591d5ab33	3504	{
be_bryan	0:b74591d5ab33	3505	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) );
be_bryan	0:b74591d5ab33	3506	return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE );
be_bryan	0:b74591d5ab33	3507	}
be_bryan	0:b74591d5ab33	3508
be_bryan	0:b74591d5ab33	3509	if( ssl->in_msg[0] != MBEDTLS_SSL_HS_CLIENT_KEY_EXCHANGE )
be_bryan	0:b74591d5ab33	3510	{
be_bryan	0:b74591d5ab33	3511	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) );
be_bryan	0:b74591d5ab33	3512	return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE );
be_bryan	0:b74591d5ab33	3513	}
be_bryan	0:b74591d5ab33	3514
be_bryan	0:b74591d5ab33	3515	#if defined(MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED)
be_bryan	0:b74591d5ab33	3516	if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_RSA )
be_bryan	0:b74591d5ab33	3517	{
be_bryan	0:b74591d5ab33	3518	if( ( ret = ssl_parse_client_dh_public( ssl, &p, end ) ) != 0 )
be_bryan	0:b74591d5ab33	3519	{
be_bryan	0:b74591d5ab33	3520	MBEDTLS_SSL_DEBUG_RET( 1, ( "ssl_parse_client_dh_public" ), ret );
be_bryan	0:b74591d5ab33	3521	return( ret );
be_bryan	0:b74591d5ab33	3522	}
be_bryan	0:b74591d5ab33	3523
be_bryan	0:b74591d5ab33	3524	if( p != end )
be_bryan	0:b74591d5ab33	3525	{
be_bryan	0:b74591d5ab33	3526	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange" ) );
be_bryan	0:b74591d5ab33	3527	return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE );
be_bryan	0:b74591d5ab33	3528	}
be_bryan	0:b74591d5ab33	3529
be_bryan	0:b74591d5ab33	3530	if( ( ret = mbedtls_dhm_calc_secret( &ssl->handshake->dhm_ctx,
be_bryan	0:b74591d5ab33	3531	ssl->handshake->premaster,
be_bryan	0:b74591d5ab33	3532	MBEDTLS_PREMASTER_SIZE,
be_bryan	0:b74591d5ab33	3533	&ssl->handshake->pmslen,
be_bryan	0:b74591d5ab33	3534	ssl->conf->f_rng, ssl->conf->p_rng ) ) != 0 )
be_bryan	0:b74591d5ab33	3535	{
be_bryan	0:b74591d5ab33	3536	MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_dhm_calc_secret", ret );
be_bryan	0:b74591d5ab33	3537	return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE_CS );
be_bryan	0:b74591d5ab33	3538	}
be_bryan	0:b74591d5ab33	3539
be_bryan	0:b74591d5ab33	3540	MBEDTLS_SSL_DEBUG_MPI( 3, "DHM: K ", &ssl->handshake->dhm_ctx.K );
be_bryan	0:b74591d5ab33	3541	}
be_bryan	0:b74591d5ab33	3542	else
be_bryan	0:b74591d5ab33	3543	#endif /* MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED */
be_bryan	0:b74591d5ab33	3544	#if defined(MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED) \|\| \
be_bryan	0:b74591d5ab33	3545	defined(MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED) \|\| \
be_bryan	0:b74591d5ab33	3546	defined(MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED) \|\| \
be_bryan	0:b74591d5ab33	3547	defined(MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED)
be_bryan	0:b74591d5ab33	3548	if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_RSA \|\|
be_bryan	0:b74591d5ab33	3549	ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA \|\|
be_bryan	0:b74591d5ab33	3550	ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDH_RSA \|\|
be_bryan	0:b74591d5ab33	3551	ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA )
be_bryan	0:b74591d5ab33	3552	{
be_bryan	0:b74591d5ab33	3553	if( ( ret = mbedtls_ecdh_read_public( &ssl->handshake->ecdh_ctx,
be_bryan	0:b74591d5ab33	3554	p, end - p) ) != 0 )
be_bryan	0:b74591d5ab33	3555	{
be_bryan	0:b74591d5ab33	3556	MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecdh_read_public", ret );
be_bryan	0:b74591d5ab33	3557	return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE_RP );
be_bryan	0:b74591d5ab33	3558	}
be_bryan	0:b74591d5ab33	3559
be_bryan	0:b74591d5ab33	3560	MBEDTLS_SSL_DEBUG_ECP( 3, "ECDH: Qp ", &ssl->handshake->ecdh_ctx.Qp );
be_bryan	0:b74591d5ab33	3561
be_bryan	0:b74591d5ab33	3562	if( ( ret = mbedtls_ecdh_calc_secret( &ssl->handshake->ecdh_ctx,
be_bryan	0:b74591d5ab33	3563	&ssl->handshake->pmslen,
be_bryan	0:b74591d5ab33	3564	ssl->handshake->premaster,
be_bryan	0:b74591d5ab33	3565	MBEDTLS_MPI_MAX_SIZE,
be_bryan	0:b74591d5ab33	3566	ssl->conf->f_rng, ssl->conf->p_rng ) ) != 0 )
be_bryan	0:b74591d5ab33	3567	{
be_bryan	0:b74591d5ab33	3568	MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecdh_calc_secret", ret );
be_bryan	0:b74591d5ab33	3569	return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE_CS );
be_bryan	0:b74591d5ab33	3570	}
be_bryan	0:b74591d5ab33	3571
be_bryan	0:b74591d5ab33	3572	MBEDTLS_SSL_DEBUG_MPI( 3, "ECDH: z ", &ssl->handshake->ecdh_ctx.z );
be_bryan	0:b74591d5ab33	3573	}
be_bryan	0:b74591d5ab33	3574	else
be_bryan	0:b74591d5ab33	3575	#endif /* MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED \|\|
be_bryan	0:b74591d5ab33	3576	MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED \|\|
be_bryan	0:b74591d5ab33	3577	MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED \|\|
be_bryan	0:b74591d5ab33	3578	MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED */
be_bryan	0:b74591d5ab33	3579	#if defined(MBEDTLS_KEY_EXCHANGE_PSK_ENABLED)
be_bryan	0:b74591d5ab33	3580	if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_PSK )
be_bryan	0:b74591d5ab33	3581	{
be_bryan	0:b74591d5ab33	3582	if( ( ret = ssl_parse_client_psk_identity( ssl, &p, end ) ) != 0 )
be_bryan	0:b74591d5ab33	3583	{
be_bryan	0:b74591d5ab33	3584	MBEDTLS_SSL_DEBUG_RET( 1, ( "ssl_parse_client_psk_identity" ), ret );
be_bryan	0:b74591d5ab33	3585	return( ret );
be_bryan	0:b74591d5ab33	3586	}
be_bryan	0:b74591d5ab33	3587
be_bryan	0:b74591d5ab33	3588	if( p != end )
be_bryan	0:b74591d5ab33	3589	{
be_bryan	0:b74591d5ab33	3590	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange" ) );
be_bryan	0:b74591d5ab33	3591	return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE );
be_bryan	0:b74591d5ab33	3592	}
be_bryan	0:b74591d5ab33	3593
be_bryan	0:b74591d5ab33	3594	if( ( ret = mbedtls_ssl_psk_derive_premaster( ssl,
be_bryan	0:b74591d5ab33	3595	ciphersuite_info->key_exchange ) ) != 0 )
be_bryan	0:b74591d5ab33	3596	{
be_bryan	0:b74591d5ab33	3597	MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_psk_derive_premaster", ret );
be_bryan	0:b74591d5ab33	3598	return( ret );
be_bryan	0:b74591d5ab33	3599	}
be_bryan	0:b74591d5ab33	3600	}
be_bryan	0:b74591d5ab33	3601	else
be_bryan	0:b74591d5ab33	3602	#endif /* MBEDTLS_KEY_EXCHANGE_PSK_ENABLED */
be_bryan	0:b74591d5ab33	3603	#if defined(MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED)
be_bryan	0:b74591d5ab33	3604	if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA_PSK )
be_bryan	0:b74591d5ab33	3605	{
be_bryan	0:b74591d5ab33	3606	if( ( ret = ssl_parse_client_psk_identity( ssl, &p, end ) ) != 0 )
be_bryan	0:b74591d5ab33	3607	{
be_bryan	0:b74591d5ab33	3608	MBEDTLS_SSL_DEBUG_RET( 1, ( "ssl_parse_client_psk_identity" ), ret );
be_bryan	0:b74591d5ab33	3609	return( ret );
be_bryan	0:b74591d5ab33	3610	}
be_bryan	0:b74591d5ab33	3611
be_bryan	0:b74591d5ab33	3612	if( ( ret = ssl_parse_encrypted_pms( ssl, p, end, 2 ) ) != 0 )
be_bryan	0:b74591d5ab33	3613	{
be_bryan	0:b74591d5ab33	3614	MBEDTLS_SSL_DEBUG_RET( 1, ( "ssl_parse_encrypted_pms" ), ret );
be_bryan	0:b74591d5ab33	3615	return( ret );
be_bryan	0:b74591d5ab33	3616	}
be_bryan	0:b74591d5ab33	3617
be_bryan	0:b74591d5ab33	3618	if( ( ret = mbedtls_ssl_psk_derive_premaster( ssl,
be_bryan	0:b74591d5ab33	3619	ciphersuite_info->key_exchange ) ) != 0 )
be_bryan	0:b74591d5ab33	3620	{
be_bryan	0:b74591d5ab33	3621	MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_psk_derive_premaster", ret );
be_bryan	0:b74591d5ab33	3622	return( ret );
be_bryan	0:b74591d5ab33	3623	}
be_bryan	0:b74591d5ab33	3624	}
be_bryan	0:b74591d5ab33	3625	else
be_bryan	0:b74591d5ab33	3626	#endif /* MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED */
be_bryan	0:b74591d5ab33	3627	#if defined(MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED)
be_bryan	0:b74591d5ab33	3628	if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_PSK )
be_bryan	0:b74591d5ab33	3629	{
be_bryan	0:b74591d5ab33	3630	if( ( ret = ssl_parse_client_psk_identity( ssl, &p, end ) ) != 0 )
be_bryan	0:b74591d5ab33	3631	{
be_bryan	0:b74591d5ab33	3632	MBEDTLS_SSL_DEBUG_RET( 1, ( "ssl_parse_client_psk_identity" ), ret );
be_bryan	0:b74591d5ab33	3633	return( ret );
be_bryan	0:b74591d5ab33	3634	}
be_bryan	0:b74591d5ab33	3635	if( ( ret = ssl_parse_client_dh_public( ssl, &p, end ) ) != 0 )
be_bryan	0:b74591d5ab33	3636	{
be_bryan	0:b74591d5ab33	3637	MBEDTLS_SSL_DEBUG_RET( 1, ( "ssl_parse_client_dh_public" ), ret );
be_bryan	0:b74591d5ab33	3638	return( ret );
be_bryan	0:b74591d5ab33	3639	}
be_bryan	0:b74591d5ab33	3640
be_bryan	0:b74591d5ab33	3641	if( p != end )
be_bryan	0:b74591d5ab33	3642	{
be_bryan	0:b74591d5ab33	3643	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange" ) );
be_bryan	0:b74591d5ab33	3644	return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE );
be_bryan	0:b74591d5ab33	3645	}
be_bryan	0:b74591d5ab33	3646
be_bryan	0:b74591d5ab33	3647	if( ( ret = mbedtls_ssl_psk_derive_premaster( ssl,
be_bryan	0:b74591d5ab33	3648	ciphersuite_info->key_exchange ) ) != 0 )
be_bryan	0:b74591d5ab33	3649	{
be_bryan	0:b74591d5ab33	3650	MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_psk_derive_premaster", ret );
be_bryan	0:b74591d5ab33	3651	return( ret );
be_bryan	0:b74591d5ab33	3652	}
be_bryan	0:b74591d5ab33	3653	}
be_bryan	0:b74591d5ab33	3654	else
be_bryan	0:b74591d5ab33	3655	#endif /* MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED */
be_bryan	0:b74591d5ab33	3656	#if defined(MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED)
be_bryan	0:b74591d5ab33	3657	if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_PSK )
be_bryan	0:b74591d5ab33	3658	{
be_bryan	0:b74591d5ab33	3659	if( ( ret = ssl_parse_client_psk_identity( ssl, &p, end ) ) != 0 )
be_bryan	0:b74591d5ab33	3660	{
be_bryan	0:b74591d5ab33	3661	MBEDTLS_SSL_DEBUG_RET( 1, ( "ssl_parse_client_psk_identity" ), ret );
be_bryan	0:b74591d5ab33	3662	return( ret );
be_bryan	0:b74591d5ab33	3663	}
be_bryan	0:b74591d5ab33	3664
be_bryan	0:b74591d5ab33	3665	if( ( ret = mbedtls_ecdh_read_public( &ssl->handshake->ecdh_ctx,
be_bryan	0:b74591d5ab33	3666	p, end - p ) ) != 0 )
be_bryan	0:b74591d5ab33	3667	{
be_bryan	0:b74591d5ab33	3668	MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecdh_read_public", ret );
be_bryan	0:b74591d5ab33	3669	return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE_RP );
be_bryan	0:b74591d5ab33	3670	}
be_bryan	0:b74591d5ab33	3671
be_bryan	0:b74591d5ab33	3672	MBEDTLS_SSL_DEBUG_ECP( 3, "ECDH: Qp ", &ssl->handshake->ecdh_ctx.Qp );
be_bryan	0:b74591d5ab33	3673
be_bryan	0:b74591d5ab33	3674	if( ( ret = mbedtls_ssl_psk_derive_premaster( ssl,
be_bryan	0:b74591d5ab33	3675	ciphersuite_info->key_exchange ) ) != 0 )
be_bryan	0:b74591d5ab33	3676	{
be_bryan	0:b74591d5ab33	3677	MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_psk_derive_premaster", ret );
be_bryan	0:b74591d5ab33	3678	return( ret );
be_bryan	0:b74591d5ab33	3679	}
be_bryan	0:b74591d5ab33	3680	}
be_bryan	0:b74591d5ab33	3681	else
be_bryan	0:b74591d5ab33	3682	#endif /* MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED */
be_bryan	0:b74591d5ab33	3683	#if defined(MBEDTLS_KEY_EXCHANGE_RSA_ENABLED)
be_bryan	0:b74591d5ab33	3684	if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA )
be_bryan	0:b74591d5ab33	3685	{
be_bryan	0:b74591d5ab33	3686	if( ( ret = ssl_parse_encrypted_pms( ssl, p, end, 0 ) ) != 0 )
be_bryan	0:b74591d5ab33	3687	{
be_bryan	0:b74591d5ab33	3688	MBEDTLS_SSL_DEBUG_RET( 1, ( "ssl_parse_parse_encrypted_pms_secret" ), ret );
be_bryan	0:b74591d5ab33	3689	return( ret );
be_bryan	0:b74591d5ab33	3690	}
be_bryan	0:b74591d5ab33	3691	}
be_bryan	0:b74591d5ab33	3692	else
be_bryan	0:b74591d5ab33	3693	#endif /* MBEDTLS_KEY_EXCHANGE_RSA_ENABLED */
be_bryan	0:b74591d5ab33	3694	#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
be_bryan	0:b74591d5ab33	3695	if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECJPAKE )
be_bryan	0:b74591d5ab33	3696	{
be_bryan	0:b74591d5ab33	3697	ret = mbedtls_ecjpake_read_round_two( &ssl->handshake->ecjpake_ctx,
be_bryan	0:b74591d5ab33	3698	p, end - p );
be_bryan	0:b74591d5ab33	3699	if( ret != 0 )
be_bryan	0:b74591d5ab33	3700	{
be_bryan	0:b74591d5ab33	3701	MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecjpake_read_round_two", ret );
be_bryan	0:b74591d5ab33	3702	return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
be_bryan	0:b74591d5ab33	3703	}
be_bryan	0:b74591d5ab33	3704
be_bryan	0:b74591d5ab33	3705	ret = mbedtls_ecjpake_derive_secret( &ssl->handshake->ecjpake_ctx,
be_bryan	0:b74591d5ab33	3706	ssl->handshake->premaster, 32, &ssl->handshake->pmslen,
be_bryan	0:b74591d5ab33	3707	ssl->conf->f_rng, ssl->conf->p_rng );
be_bryan	0:b74591d5ab33	3708	if( ret != 0 )
be_bryan	0:b74591d5ab33	3709	{
be_bryan	0:b74591d5ab33	3710	MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecjpake_derive_secret", ret );
be_bryan	0:b74591d5ab33	3711	return( ret );
be_bryan	0:b74591d5ab33	3712	}
be_bryan	0:b74591d5ab33	3713	}
be_bryan	0:b74591d5ab33	3714	else
be_bryan	0:b74591d5ab33	3715	#endif /* MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */
be_bryan	0:b74591d5ab33	3716	{
be_bryan	0:b74591d5ab33	3717	MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
be_bryan	0:b74591d5ab33	3718	return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
be_bryan	0:b74591d5ab33	3719	}
be_bryan	0:b74591d5ab33	3720
be_bryan	0:b74591d5ab33	3721	if( ( ret = mbedtls_ssl_derive_keys( ssl ) ) != 0 )
be_bryan	0:b74591d5ab33	3722	{
be_bryan	0:b74591d5ab33	3723	MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_derive_keys", ret );
be_bryan	0:b74591d5ab33	3724	return( ret );
be_bryan	0:b74591d5ab33	3725	}
be_bryan	0:b74591d5ab33	3726
be_bryan	0:b74591d5ab33	3727	ssl->state++;
be_bryan	0:b74591d5ab33	3728
be_bryan	0:b74591d5ab33	3729	MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse client key exchange" ) );
be_bryan	0:b74591d5ab33	3730
be_bryan	0:b74591d5ab33	3731	return( 0 );
be_bryan	0:b74591d5ab33	3732	}
be_bryan	0:b74591d5ab33	3733
be_bryan	0:b74591d5ab33	3734	#if !defined(MBEDTLS_KEY_EXCHANGE_RSA_ENABLED) && \
be_bryan	0:b74591d5ab33	3735	!defined(MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED) && \
be_bryan	0:b74591d5ab33	3736	!defined(MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED) && \
be_bryan	0:b74591d5ab33	3737	!defined(MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED) && \
be_bryan	0:b74591d5ab33	3738	!defined(MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED)&& \
be_bryan	0:b74591d5ab33	3739	!defined(MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED)
be_bryan	0:b74591d5ab33	3740	static int ssl_parse_certificate_verify( mbedtls_ssl_context *ssl )
be_bryan	0:b74591d5ab33	3741	{
be_bryan	0:b74591d5ab33	3742	const mbedtls_ssl_ciphersuite_t *ciphersuite_info =
be_bryan	0:b74591d5ab33	3743	ssl->transform_negotiate->ciphersuite_info;
be_bryan	0:b74591d5ab33	3744
be_bryan	0:b74591d5ab33	3745	MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse certificate verify" ) );
be_bryan	0:b74591d5ab33	3746
be_bryan	0:b74591d5ab33	3747	if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_PSK \|\|
be_bryan	0:b74591d5ab33	3748	ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA_PSK \|\|
be_bryan	0:b74591d5ab33	3749	ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_PSK \|\|
be_bryan	0:b74591d5ab33	3750	ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_PSK \|\|
be_bryan	0:b74591d5ab33	3751	ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECJPAKE )
be_bryan	0:b74591d5ab33	3752	{
be_bryan	0:b74591d5ab33	3753	MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip parse certificate verify" ) );
be_bryan	0:b74591d5ab33	3754	ssl->state++;
be_bryan	0:b74591d5ab33	3755	return( 0 );
be_bryan	0:b74591d5ab33	3756	}
be_bryan	0:b74591d5ab33	3757
be_bryan	0:b74591d5ab33	3758	MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
be_bryan	0:b74591d5ab33	3759	return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
be_bryan	0:b74591d5ab33	3760	}
be_bryan	0:b74591d5ab33	3761	#else
be_bryan	0:b74591d5ab33	3762	static int ssl_parse_certificate_verify( mbedtls_ssl_context *ssl )
be_bryan	0:b74591d5ab33	3763	{
be_bryan	0:b74591d5ab33	3764	int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE;
be_bryan	0:b74591d5ab33	3765	size_t i, sig_len;
be_bryan	0:b74591d5ab33	3766	unsigned char hash[48];
be_bryan	0:b74591d5ab33	3767	unsigned char *hash_start = hash;
be_bryan	0:b74591d5ab33	3768	size_t hashlen;
be_bryan	0:b74591d5ab33	3769	#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
be_bryan	0:b74591d5ab33	3770	mbedtls_pk_type_t pk_alg;
be_bryan	0:b74591d5ab33	3771	#endif
be_bryan	0:b74591d5ab33	3772	mbedtls_md_type_t md_alg;
be_bryan	0:b74591d5ab33	3773	const mbedtls_ssl_ciphersuite_t *ciphersuite_info =
be_bryan	0:b74591d5ab33	3774	ssl->transform_negotiate->ciphersuite_info;
be_bryan	0:b74591d5ab33	3775
be_bryan	0:b74591d5ab33	3776	MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse certificate verify" ) );
be_bryan	0:b74591d5ab33	3777
be_bryan	0:b74591d5ab33	3778	if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_PSK \|\|
be_bryan	0:b74591d5ab33	3779	ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA_PSK \|\|
be_bryan	0:b74591d5ab33	3780	ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_PSK \|\|
be_bryan	0:b74591d5ab33	3781	ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_PSK \|\|
be_bryan	0:b74591d5ab33	3782	ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECJPAKE \|\|
be_bryan	0:b74591d5ab33	3783	ssl->session_negotiate->peer_cert == NULL )
be_bryan	0:b74591d5ab33	3784	{
be_bryan	0:b74591d5ab33	3785	MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip parse certificate verify" ) );
be_bryan	0:b74591d5ab33	3786	ssl->state++;
be_bryan	0:b74591d5ab33	3787	return( 0 );
be_bryan	0:b74591d5ab33	3788	}
be_bryan	0:b74591d5ab33	3789
be_bryan	0:b74591d5ab33	3790	/* Read the message without adding it to the checksum */
be_bryan	0:b74591d5ab33	3791	do {
be_bryan	0:b74591d5ab33	3792
be_bryan	0:b74591d5ab33	3793	if( ( ret = mbedtls_ssl_read_record_layer( ssl ) ) != 0 )
be_bryan	0:b74591d5ab33	3794	{
be_bryan	0:b74591d5ab33	3795	MBEDTLS_SSL_DEBUG_RET( 1, ( "mbedtls_ssl_read_record_layer" ), ret );
be_bryan	0:b74591d5ab33	3796	return( ret );
be_bryan	0:b74591d5ab33	3797	}
be_bryan	0:b74591d5ab33	3798
be_bryan	0:b74591d5ab33	3799	ret = mbedtls_ssl_handle_message_type( ssl );
be_bryan	0:b74591d5ab33	3800
be_bryan	0:b74591d5ab33	3801	} while( MBEDTLS_ERR_SSL_NON_FATAL == ret );
be_bryan	0:b74591d5ab33	3802
be_bryan	0:b74591d5ab33	3803	if( 0 != ret )
be_bryan	0:b74591d5ab33	3804	{
be_bryan	0:b74591d5ab33	3805	MBEDTLS_SSL_DEBUG_RET( 1, ( "mbedtls_ssl_handle_message_type" ), ret );
be_bryan	0:b74591d5ab33	3806	return( ret );
be_bryan	0:b74591d5ab33	3807	}
be_bryan	0:b74591d5ab33	3808
be_bryan	0:b74591d5ab33	3809	ssl->state++;
be_bryan	0:b74591d5ab33	3810
be_bryan	0:b74591d5ab33	3811	/* Process the message contents */
be_bryan	0:b74591d5ab33	3812	if( ssl->in_msgtype != MBEDTLS_SSL_MSG_HANDSHAKE \|\|
be_bryan	0:b74591d5ab33	3813	ssl->in_msg[0] != MBEDTLS_SSL_HS_CERTIFICATE_VERIFY )
be_bryan	0:b74591d5ab33	3814	{
be_bryan	0:b74591d5ab33	3815	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate verify message" ) );
be_bryan	0:b74591d5ab33	3816	return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE_VERIFY );
be_bryan	0:b74591d5ab33	3817	}
be_bryan	0:b74591d5ab33	3818
be_bryan	0:b74591d5ab33	3819	i = mbedtls_ssl_hs_hdr_len( ssl );
be_bryan	0:b74591d5ab33	3820
be_bryan	0:b74591d5ab33	3821	/*
be_bryan	0:b74591d5ab33	3822	* struct {
be_bryan	0:b74591d5ab33	3823	* SignatureAndHashAlgorithm algorithm; -- TLS 1.2 only
be_bryan	0:b74591d5ab33	3824	* opaque signature<0..2^16-1>;
be_bryan	0:b74591d5ab33	3825	* } DigitallySigned;
be_bryan	0:b74591d5ab33	3826	*/
be_bryan	0:b74591d5ab33	3827	#if defined(MBEDTLS_SSL_PROTO_SSL3) \|\| defined(MBEDTLS_SSL_PROTO_TLS1) \|\| \
be_bryan	0:b74591d5ab33	3828	defined(MBEDTLS_SSL_PROTO_TLS1_1)
be_bryan	0:b74591d5ab33	3829	if( ssl->minor_ver != MBEDTLS_SSL_MINOR_VERSION_3 )
be_bryan	0:b74591d5ab33	3830	{
be_bryan	0:b74591d5ab33	3831	md_alg = MBEDTLS_MD_NONE;
be_bryan	0:b74591d5ab33	3832	hashlen = 36;
be_bryan	0:b74591d5ab33	3833
be_bryan	0:b74591d5ab33	3834	/* For ECDSA, use SHA-1, not MD-5 + SHA-1 */
be_bryan	0:b74591d5ab33	3835	if( mbedtls_pk_can_do( &ssl->session_negotiate->peer_cert->pk,
be_bryan	0:b74591d5ab33	3836	MBEDTLS_PK_ECDSA ) )
be_bryan	0:b74591d5ab33	3837	{
be_bryan	0:b74591d5ab33	3838	hash_start += 16;
be_bryan	0:b74591d5ab33	3839	hashlen -= 16;
be_bryan	0:b74591d5ab33	3840	md_alg = MBEDTLS_MD_SHA1;
be_bryan	0:b74591d5ab33	3841	}
be_bryan	0:b74591d5ab33	3842	}
be_bryan	0:b74591d5ab33	3843	else
be_bryan	0:b74591d5ab33	3844	#endif /* MBEDTLS_SSL_PROTO_SSL3 \|\| MBEDTLS_SSL_PROTO_TLS1 \|\|
be_bryan	0:b74591d5ab33	3845	MBEDTLS_SSL_PROTO_TLS1_1 */
be_bryan	0:b74591d5ab33	3846	#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
be_bryan	0:b74591d5ab33	3847	if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 )
be_bryan	0:b74591d5ab33	3848	{
be_bryan	0:b74591d5ab33	3849	if( i + 2 > ssl->in_hslen )
be_bryan	0:b74591d5ab33	3850	{
be_bryan	0:b74591d5ab33	3851	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate verify message" ) );
be_bryan	0:b74591d5ab33	3852	return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE_VERIFY );
be_bryan	0:b74591d5ab33	3853	}
be_bryan	0:b74591d5ab33	3854
be_bryan	0:b74591d5ab33	3855	/*
be_bryan	0:b74591d5ab33	3856	* Hash
be_bryan	0:b74591d5ab33	3857	*/
be_bryan	0:b74591d5ab33	3858	md_alg = mbedtls_ssl_md_alg_from_hash( ssl->in_msg[i] );
be_bryan	0:b74591d5ab33	3859
be_bryan	0:b74591d5ab33	3860	if( md_alg == MBEDTLS_MD_NONE \|\| mbedtls_ssl_set_calc_verify_md( ssl, ssl->in_msg[i] ) )
be_bryan	0:b74591d5ab33	3861	{
be_bryan	0:b74591d5ab33	3862	MBEDTLS_SSL_DEBUG_MSG( 1, ( "peer not adhering to requested sig_alg"
be_bryan	0:b74591d5ab33	3863	" for verify message" ) );
be_bryan	0:b74591d5ab33	3864	return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE_VERIFY );
be_bryan	0:b74591d5ab33	3865	}
be_bryan	0:b74591d5ab33	3866
be_bryan	0:b74591d5ab33	3867	#if !defined(MBEDTLS_MD_SHA1)
be_bryan	0:b74591d5ab33	3868	if( MBEDTLS_MD_SHA1 == md_alg )
be_bryan	0:b74591d5ab33	3869	hash_start += 16;
be_bryan	0:b74591d5ab33	3870	#endif
be_bryan	0:b74591d5ab33	3871
be_bryan	0:b74591d5ab33	3872	/* Info from md_alg will be used instead */
be_bryan	0:b74591d5ab33	3873	hashlen = 0;
be_bryan	0:b74591d5ab33	3874
be_bryan	0:b74591d5ab33	3875	i++;
be_bryan	0:b74591d5ab33	3876
be_bryan	0:b74591d5ab33	3877	/*
be_bryan	0:b74591d5ab33	3878	* Signature
be_bryan	0:b74591d5ab33	3879	*/
be_bryan	0:b74591d5ab33	3880	if( ( pk_alg = mbedtls_ssl_pk_alg_from_sig( ssl->in_msg[i] ) )
be_bryan	0:b74591d5ab33	3881	== MBEDTLS_PK_NONE )
be_bryan	0:b74591d5ab33	3882	{
be_bryan	0:b74591d5ab33	3883	MBEDTLS_SSL_DEBUG_MSG( 1, ( "peer not adhering to requested sig_alg"
be_bryan	0:b74591d5ab33	3884	" for verify message" ) );
be_bryan	0:b74591d5ab33	3885	return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE_VERIFY );
be_bryan	0:b74591d5ab33	3886	}
be_bryan	0:b74591d5ab33	3887
be_bryan	0:b74591d5ab33	3888	/*
be_bryan	0:b74591d5ab33	3889	* Check the certificate's key type matches the signature alg
be_bryan	0:b74591d5ab33	3890	*/
be_bryan	0:b74591d5ab33	3891	if( ! mbedtls_pk_can_do( &ssl->session_negotiate->peer_cert->pk, pk_alg ) )
be_bryan	0:b74591d5ab33	3892	{
be_bryan	0:b74591d5ab33	3893	MBEDTLS_SSL_DEBUG_MSG( 1, ( "sig_alg doesn't match cert key" ) );
be_bryan	0:b74591d5ab33	3894	return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE_VERIFY );
be_bryan	0:b74591d5ab33	3895	}
be_bryan	0:b74591d5ab33	3896
be_bryan	0:b74591d5ab33	3897	i++;
be_bryan	0:b74591d5ab33	3898	}
be_bryan	0:b74591d5ab33	3899	else
be_bryan	0:b74591d5ab33	3900	#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
be_bryan	0:b74591d5ab33	3901	{
be_bryan	0:b74591d5ab33	3902	MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
be_bryan	0:b74591d5ab33	3903	return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
be_bryan	0:b74591d5ab33	3904	}
be_bryan	0:b74591d5ab33	3905
be_bryan	0:b74591d5ab33	3906	if( i + 2 > ssl->in_hslen )
be_bryan	0:b74591d5ab33	3907	{
be_bryan	0:b74591d5ab33	3908	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate verify message" ) );
be_bryan	0:b74591d5ab33	3909	return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE_VERIFY );
be_bryan	0:b74591d5ab33	3910	}
be_bryan	0:b74591d5ab33	3911
be_bryan	0:b74591d5ab33	3912	sig_len = ( ssl->in_msg[i] << 8 ) \| ssl->in_msg[i+1];
be_bryan	0:b74591d5ab33	3913	i += 2;
be_bryan	0:b74591d5ab33	3914
be_bryan	0:b74591d5ab33	3915	if( i + sig_len != ssl->in_hslen )
be_bryan	0:b74591d5ab33	3916	{
be_bryan	0:b74591d5ab33	3917	MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate verify message" ) );
be_bryan	0:b74591d5ab33	3918	return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE_VERIFY );
be_bryan	0:b74591d5ab33	3919	}
be_bryan	0:b74591d5ab33	3920
be_bryan	0:b74591d5ab33	3921	/* Calculate hash and verify signature */
be_bryan	0:b74591d5ab33	3922	ssl->handshake->calc_verify( ssl, hash );
be_bryan	0:b74591d5ab33	3923
be_bryan	0:b74591d5ab33	3924	if( ( ret = mbedtls_pk_verify( &ssl->session_negotiate->peer_cert->pk,
be_bryan	0:b74591d5ab33	3925	md_alg, hash_start, hashlen,
be_bryan	0:b74591d5ab33	3926	ssl->in_msg + i, sig_len ) ) != 0 )
be_bryan	0:b74591d5ab33	3927	{
be_bryan	0:b74591d5ab33	3928	MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_pk_verify", ret );
be_bryan	0:b74591d5ab33	3929	return( ret );
be_bryan	0:b74591d5ab33	3930	}
be_bryan	0:b74591d5ab33	3931
be_bryan	0:b74591d5ab33	3932	mbedtls_ssl_update_handshake_status( ssl );
be_bryan	0:b74591d5ab33	3933
be_bryan	0:b74591d5ab33	3934	MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse certificate verify" ) );
be_bryan	0:b74591d5ab33	3935
be_bryan	0:b74591d5ab33	3936	return( ret );
be_bryan	0:b74591d5ab33	3937	}
be_bryan	0:b74591d5ab33	3938	#endif /* !MBEDTLS_KEY_EXCHANGE_RSA_ENABLED &&
be_bryan	0:b74591d5ab33	3939	!MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED &&
be_bryan	0:b74591d5ab33	3940	!MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED &&
be_bryan	0:b74591d5ab33	3941	!MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED &&
be_bryan	0:b74591d5ab33	3942	!MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED &&
be_bryan	0:b74591d5ab33	3943	!MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED */
be_bryan	0:b74591d5ab33	3944
be_bryan	0:b74591d5ab33	3945	#if defined(MBEDTLS_SSL_SESSION_TICKETS)
be_bryan	0:b74591d5ab33	3946	static int ssl_write_new_session_ticket( mbedtls_ssl_context *ssl )
be_bryan	0:b74591d5ab33	3947	{
be_bryan	0:b74591d5ab33	3948	int ret;
be_bryan	0:b74591d5ab33	3949	size_t tlen;
be_bryan	0:b74591d5ab33	3950	uint32_t lifetime;
be_bryan	0:b74591d5ab33	3951
be_bryan	0:b74591d5ab33	3952	MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write new session ticket" ) );
be_bryan	0:b74591d5ab33	3953
be_bryan	0:b74591d5ab33	3954	ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE;
be_bryan	0:b74591d5ab33	3955	ssl->out_msg[0] = MBEDTLS_SSL_HS_NEW_SESSION_TICKET;
be_bryan	0:b74591d5ab33	3956
be_bryan	0:b74591d5ab33	3957	/*
be_bryan	0:b74591d5ab33	3958	* struct {
be_bryan	0:b74591d5ab33	3959	* uint32 ticket_lifetime_hint;
be_bryan	0:b74591d5ab33	3960	* opaque ticket<0..2^16-1>;
be_bryan	0:b74591d5ab33	3961	* } NewSessionTicket;
be_bryan	0:b74591d5ab33	3962	*
be_bryan	0:b74591d5ab33	3963	* 4 . 7 ticket_lifetime_hint (0 = unspecified)
be_bryan	0:b74591d5ab33	3964	* 8 . 9 ticket_len (n)
be_bryan	0:b74591d5ab33	3965	* 10 . 9+n ticket content
be_bryan	0:b74591d5ab33	3966	*/
be_bryan	0:b74591d5ab33	3967
be_bryan	0:b74591d5ab33	3968	if( ( ret = ssl->conf->f_ticket_write( ssl->conf->p_ticket,
be_bryan	0:b74591d5ab33	3969	ssl->session_negotiate,
be_bryan	0:b74591d5ab33	3970	ssl->out_msg + 10,
be_bryan	0:b74591d5ab33	3971	ssl->out_msg + MBEDTLS_SSL_MAX_CONTENT_LEN,
be_bryan	0:b74591d5ab33	3972	&tlen, &lifetime ) ) != 0 )
be_bryan	0:b74591d5ab33	3973	{
be_bryan	0:b74591d5ab33	3974	MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_ticket_write", ret );
be_bryan	0:b74591d5ab33	3975	tlen = 0;
be_bryan	0:b74591d5ab33	3976	}
be_bryan	0:b74591d5ab33	3977
be_bryan	0:b74591d5ab33	3978	ssl->out_msg[4] = ( lifetime >> 24 ) & 0xFF;
be_bryan	0:b74591d5ab33	3979	ssl->out_msg[5] = ( lifetime >> 16 ) & 0xFF;
be_bryan	0:b74591d5ab33	3980	ssl->out_msg[6] = ( lifetime >> 8 ) & 0xFF;
be_bryan	0:b74591d5ab33	3981	ssl->out_msg[7] = ( lifetime ) & 0xFF;
be_bryan	0:b74591d5ab33	3982
be_bryan	0:b74591d5ab33	3983	ssl->out_msg[8] = (unsigned char)( ( tlen >> 8 ) & 0xFF );
be_bryan	0:b74591d5ab33	3984	ssl->out_msg[9] = (unsigned char)( ( tlen ) & 0xFF );
be_bryan	0:b74591d5ab33	3985
be_bryan	0:b74591d5ab33	3986	ssl->out_msglen = 10 + tlen;
be_bryan	0:b74591d5ab33	3987
be_bryan	0:b74591d5ab33	3988	/*
be_bryan	0:b74591d5ab33	3989	* Morally equivalent to updating ssl->state, but NewSessionTicket and
be_bryan	0:b74591d5ab33	3990	* ChangeCipherSpec share the same state.
be_bryan	0:b74591d5ab33	3991	*/
be_bryan	0:b74591d5ab33	3992	ssl->handshake->new_session_ticket = 0;
be_bryan	0:b74591d5ab33	3993
be_bryan	0:b74591d5ab33	3994	if( ( ret = mbedtls_ssl_write_record( ssl ) ) != 0 )
be_bryan	0:b74591d5ab33	3995	{
be_bryan	0:b74591d5ab33	3996	MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_record", ret );
be_bryan	0:b74591d5ab33	3997	return( ret );
be_bryan	0:b74591d5ab33	3998	}
be_bryan	0:b74591d5ab33	3999
be_bryan	0:b74591d5ab33	4000	MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write new session ticket" ) );
be_bryan	0:b74591d5ab33	4001
be_bryan	0:b74591d5ab33	4002	return( 0 );
be_bryan	0:b74591d5ab33	4003	}
be_bryan	0:b74591d5ab33	4004	#endif /* MBEDTLS_SSL_SESSION_TICKETS */
be_bryan	0:b74591d5ab33	4005
be_bryan	0:b74591d5ab33	4006	/*
be_bryan	0:b74591d5ab33	4007	* SSL handshake -- server side -- single step
be_bryan	0:b74591d5ab33	4008	*/
be_bryan	0:b74591d5ab33	4009	int mbedtls_ssl_handshake_server_step( mbedtls_ssl_context *ssl )
be_bryan	0:b74591d5ab33	4010	{
be_bryan	0:b74591d5ab33	4011	int ret = 0;
be_bryan	0:b74591d5ab33	4012
be_bryan	0:b74591d5ab33	4013	if( ssl->state == MBEDTLS_SSL_HANDSHAKE_OVER \|\| ssl->handshake == NULL )
be_bryan	0:b74591d5ab33	4014	return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
be_bryan	0:b74591d5ab33	4015
be_bryan	0:b74591d5ab33	4016	MBEDTLS_SSL_DEBUG_MSG( 2, ( "server state: %d", ssl->state ) );
be_bryan	0:b74591d5ab33	4017
be_bryan	0:b74591d5ab33	4018	if( ( ret = mbedtls_ssl_flush_output( ssl ) ) != 0 )
be_bryan	0:b74591d5ab33	4019	return( ret );
be_bryan	0:b74591d5ab33	4020
be_bryan	0:b74591d5ab33	4021	#if defined(MBEDTLS_SSL_PROTO_DTLS)
be_bryan	0:b74591d5ab33	4022	if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
be_bryan	0:b74591d5ab33	4023	ssl->handshake->retransmit_state == MBEDTLS_SSL_RETRANS_SENDING )
be_bryan	0:b74591d5ab33	4024	{
be_bryan	0:b74591d5ab33	4025	if( ( ret = mbedtls_ssl_resend( ssl ) ) != 0 )
be_bryan	0:b74591d5ab33	4026	return( ret );
be_bryan	0:b74591d5ab33	4027	}
be_bryan	0:b74591d5ab33	4028	#endif
be_bryan	0:b74591d5ab33	4029
be_bryan	0:b74591d5ab33	4030	switch( ssl->state )
be_bryan	0:b74591d5ab33	4031	{
be_bryan	0:b74591d5ab33	4032	case MBEDTLS_SSL_HELLO_REQUEST:
be_bryan	0:b74591d5ab33	4033	ssl->state = MBEDTLS_SSL_CLIENT_HELLO;
be_bryan	0:b74591d5ab33	4034	break;
be_bryan	0:b74591d5ab33	4035
be_bryan	0:b74591d5ab33	4036	/*
be_bryan	0:b74591d5ab33	4037	* <== ClientHello
be_bryan	0:b74591d5ab33	4038	*/
be_bryan	0:b74591d5ab33	4039	case MBEDTLS_SSL_CLIENT_HELLO:
be_bryan	0:b74591d5ab33	4040	ret = ssl_parse_client_hello( ssl );
be_bryan	0:b74591d5ab33	4041	break;
be_bryan	0:b74591d5ab33	4042
be_bryan	0:b74591d5ab33	4043	#if defined(MBEDTLS_SSL_PROTO_DTLS)
be_bryan	0:b74591d5ab33	4044	case MBEDTLS_SSL_SERVER_HELLO_VERIFY_REQUEST_SENT:
be_bryan	0:b74591d5ab33	4045	return( MBEDTLS_ERR_SSL_HELLO_VERIFY_REQUIRED );
be_bryan	0:b74591d5ab33	4046	#endif
be_bryan	0:b74591d5ab33	4047
be_bryan	0:b74591d5ab33	4048	/*
be_bryan	0:b74591d5ab33	4049	* ==> ServerHello
be_bryan	0:b74591d5ab33	4050	* Certificate
be_bryan	0:b74591d5ab33	4051	* ( ServerKeyExchange )
be_bryan	0:b74591d5ab33	4052	* ( CertificateRequest )
be_bryan	0:b74591d5ab33	4053	* ServerHelloDone
be_bryan	0:b74591d5ab33	4054	*/
be_bryan	0:b74591d5ab33	4055	case MBEDTLS_SSL_SERVER_HELLO:
be_bryan	0:b74591d5ab33	4056	ret = ssl_write_server_hello( ssl );
be_bryan	0:b74591d5ab33	4057	break;
be_bryan	0:b74591d5ab33	4058
be_bryan	0:b74591d5ab33	4059	case MBEDTLS_SSL_SERVER_CERTIFICATE:
be_bryan	0:b74591d5ab33	4060	ret = mbedtls_ssl_write_certificate( ssl );
be_bryan	0:b74591d5ab33	4061	break;
be_bryan	0:b74591d5ab33	4062
be_bryan	0:b74591d5ab33	4063	case MBEDTLS_SSL_SERVER_KEY_EXCHANGE:
be_bryan	0:b74591d5ab33	4064	ret = ssl_write_server_key_exchange( ssl );
be_bryan	0:b74591d5ab33	4065	break;
be_bryan	0:b74591d5ab33	4066
be_bryan	0:b74591d5ab33	4067	case MBEDTLS_SSL_CERTIFICATE_REQUEST:
be_bryan	0:b74591d5ab33	4068	ret = ssl_write_certificate_request( ssl );
be_bryan	0:b74591d5ab33	4069	break;
be_bryan	0:b74591d5ab33	4070
be_bryan	0:b74591d5ab33	4071	case MBEDTLS_SSL_SERVER_HELLO_DONE:
be_bryan	0:b74591d5ab33	4072	ret = ssl_write_server_hello_done( ssl );
be_bryan	0:b74591d5ab33	4073	break;
be_bryan	0:b74591d5ab33	4074
be_bryan	0:b74591d5ab33	4075	/*
be_bryan	0:b74591d5ab33	4076	* <== ( Certificate/Alert )
be_bryan	0:b74591d5ab33	4077	* ClientKeyExchange
be_bryan	0:b74591d5ab33	4078	* ( CertificateVerify )
be_bryan	0:b74591d5ab33	4079	* ChangeCipherSpec
be_bryan	0:b74591d5ab33	4080	* Finished
be_bryan	0:b74591d5ab33	4081	*/
be_bryan	0:b74591d5ab33	4082	case MBEDTLS_SSL_CLIENT_CERTIFICATE:
be_bryan	0:b74591d5ab33	4083	ret = mbedtls_ssl_parse_certificate( ssl );
be_bryan	0:b74591d5ab33	4084	break;
be_bryan	0:b74591d5ab33	4085
be_bryan	0:b74591d5ab33	4086	case MBEDTLS_SSL_CLIENT_KEY_EXCHANGE:
be_bryan	0:b74591d5ab33	4087	ret = ssl_parse_client_key_exchange( ssl );
be_bryan	0:b74591d5ab33	4088	break;
be_bryan	0:b74591d5ab33	4089
be_bryan	0:b74591d5ab33	4090	case MBEDTLS_SSL_CERTIFICATE_VERIFY:
be_bryan	0:b74591d5ab33	4091	ret = ssl_parse_certificate_verify( ssl );
be_bryan	0:b74591d5ab33	4092	break;
be_bryan	0:b74591d5ab33	4093
be_bryan	0:b74591d5ab33	4094	case MBEDTLS_SSL_CLIENT_CHANGE_CIPHER_SPEC:
be_bryan	0:b74591d5ab33	4095	ret = mbedtls_ssl_parse_change_cipher_spec( ssl );
be_bryan	0:b74591d5ab33	4096	break;
be_bryan	0:b74591d5ab33	4097
be_bryan	0:b74591d5ab33	4098	case MBEDTLS_SSL_CLIENT_FINISHED:
be_bryan	0:b74591d5ab33	4099	ret = mbedtls_ssl_parse_finished( ssl );
be_bryan	0:b74591d5ab33	4100	break;
be_bryan	0:b74591d5ab33	4101
be_bryan	0:b74591d5ab33	4102	/*
be_bryan	0:b74591d5ab33	4103	* ==> ( NewSessionTicket )
be_bryan	0:b74591d5ab33	4104	* ChangeCipherSpec
be_bryan	0:b74591d5ab33	4105	* Finished
be_bryan	0:b74591d5ab33	4106	*/
be_bryan	0:b74591d5ab33	4107	case MBEDTLS_SSL_SERVER_CHANGE_CIPHER_SPEC:
be_bryan	0:b74591d5ab33	4108	#if defined(MBEDTLS_SSL_SESSION_TICKETS)
be_bryan	0:b74591d5ab33	4109	if( ssl->handshake->new_session_ticket != 0 )
be_bryan	0:b74591d5ab33	4110	ret = ssl_write_new_session_ticket( ssl );
be_bryan	0:b74591d5ab33	4111	else
be_bryan	0:b74591d5ab33	4112	#endif
be_bryan	0:b74591d5ab33	4113	ret = mbedtls_ssl_write_change_cipher_spec( ssl );
be_bryan	0:b74591d5ab33	4114	break;
be_bryan	0:b74591d5ab33	4115
be_bryan	0:b74591d5ab33	4116	case MBEDTLS_SSL_SERVER_FINISHED:
be_bryan	0:b74591d5ab33	4117	ret = mbedtls_ssl_write_finished( ssl );
be_bryan	0:b74591d5ab33	4118	break;
be_bryan	0:b74591d5ab33	4119
be_bryan	0:b74591d5ab33	4120	case MBEDTLS_SSL_FLUSH_BUFFERS:
be_bryan	0:b74591d5ab33	4121	MBEDTLS_SSL_DEBUG_MSG( 2, ( "handshake: done" ) );
be_bryan	0:b74591d5ab33	4122	ssl->state = MBEDTLS_SSL_HANDSHAKE_WRAPUP;
be_bryan	0:b74591d5ab33	4123	break;
be_bryan	0:b74591d5ab33	4124
be_bryan	0:b74591d5ab33	4125	case MBEDTLS_SSL_HANDSHAKE_WRAPUP:
be_bryan	0:b74591d5ab33	4126	mbedtls_ssl_handshake_wrapup( ssl );
be_bryan	0:b74591d5ab33	4127	break;
be_bryan	0:b74591d5ab33	4128
be_bryan	0:b74591d5ab33	4129	default:
be_bryan	0:b74591d5ab33	4130	MBEDTLS_SSL_DEBUG_MSG( 1, ( "invalid state %d", ssl->state ) );
be_bryan	0:b74591d5ab33	4131	return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
be_bryan	0:b74591d5ab33	4132	}
be_bryan	0:b74591d5ab33	4133
be_bryan	0:b74591d5ab33	4134	return( ret );
be_bryan	0:b74591d5ab33	4135	}
be_bryan	0:b74591d5ab33	4136	#endif /* MBEDTLS_SSL_SRV_C */

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Type:	Library
Created:	12 Dec 2017
Imports:	1018
Forks:	0
Commits:	1
Dependents:	14
Dependencies:	0
Followers:	23

features/mbedtls/src/ssl_srv.c@0:b74591d5ab33, 2017-12-11 (annotated)

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