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Adam Langley95c29f32014-06-20 12:00:00 -07001/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
2 * All rights reserved.
3 *
4 * This package is an SSL implementation written
5 * by Eric Young (eay@cryptsoft.com).
6 * The implementation was written so as to conform with Netscapes SSL.
7 *
8 * This library is free for commercial and non-commercial use as long as
9 * the following conditions are aheared to. The following conditions
10 * apply to all code found in this distribution, be it the RC4, RSA,
11 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
12 * included with this distribution is covered by the same copyright terms
13 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
14 *
15 * Copyright remains Eric Young's, and as such any Copyright notices in
16 * the code are not to be removed.
17 * If this package is used in a product, Eric Young should be given attribution
18 * as the author of the parts of the library used.
19 * This can be in the form of a textual message at program startup or
20 * in documentation (online or textual) provided with the package.
21 *
22 * Redistribution and use in source and binary forms, with or without
23 * modification, are permitted provided that the following conditions
24 * are met:
25 * 1. Redistributions of source code must retain the copyright
26 * notice, this list of conditions and the following disclaimer.
27 * 2. Redistributions in binary form must reproduce the above copyright
28 * notice, this list of conditions and the following disclaimer in the
29 * documentation and/or other materials provided with the distribution.
30 * 3. All advertising materials mentioning features or use of this software
31 * must display the following acknowledgement:
32 * "This product includes cryptographic software written by
33 * Eric Young (eay@cryptsoft.com)"
34 * The word 'cryptographic' can be left out if the rouines from the library
35 * being used are not cryptographic related :-).
36 * 4. If you include any Windows specific code (or a derivative thereof) from
37 * the apps directory (application code) you must include an acknowledgement:
38 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
39 *
40 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
41 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
43 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
44 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
45 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
46 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
48 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
49 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
50 * SUCH DAMAGE.
51 *
52 * The licence and distribution terms for any publically available version or
53 * derivative of this code cannot be changed. i.e. this code cannot simply be
54 * copied and put under another distribution licence
55 * [including the GNU Public Licence.]
56 */
57/* ====================================================================
58 * Copyright (c) 1998-2007 The OpenSSL Project. All rights reserved.
59 *
60 * Redistribution and use in source and binary forms, with or without
61 * modification, are permitted provided that the following conditions
62 * are met:
63 *
64 * 1. Redistributions of source code must retain the above copyright
65 * notice, this list of conditions and the following disclaimer.
66 *
67 * 2. Redistributions in binary form must reproduce the above copyright
68 * notice, this list of conditions and the following disclaimer in
69 * the documentation and/or other materials provided with the
70 * distribution.
71 *
72 * 3. All advertising materials mentioning features or use of this
73 * software must display the following acknowledgment:
74 * "This product includes software developed by the OpenSSL Project
75 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
76 *
77 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
78 * endorse or promote products derived from this software without
79 * prior written permission. For written permission, please contact
80 * openssl-core@openssl.org.
81 *
82 * 5. Products derived from this software may not be called "OpenSSL"
83 * nor may "OpenSSL" appear in their names without prior written
84 * permission of the OpenSSL Project.
85 *
86 * 6. Redistributions of any form whatsoever must retain the following
87 * acknowledgment:
88 * "This product includes software developed by the OpenSSL Project
89 * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
90 *
91 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
92 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
93 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
94 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
95 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
96 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
97 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
98 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
99 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
100 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
101 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
102 * OF THE POSSIBILITY OF SUCH DAMAGE.
103 * ====================================================================
104 *
105 * This product includes cryptographic software written by Eric Young
106 * (eay@cryptsoft.com). This product includes software written by Tim
107 * Hudson (tjh@cryptsoft.com).
108 *
109 */
110/* ====================================================================
111 * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
112 *
113 * Portions of the attached software ("Contribution") are developed by
114 * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project.
115 *
116 * The Contribution is licensed pursuant to the OpenSSL open source
117 * license provided above.
118 *
119 * ECC cipher suite support in OpenSSL originally written by
120 * Vipul Gupta and Sumit Gupta of Sun Microsystems Laboratories.
121 *
122 */
123/* ====================================================================
124 * Copyright 2005 Nokia. All rights reserved.
125 *
126 * The portions of the attached software ("Contribution") is developed by
127 * Nokia Corporation and is licensed pursuant to the OpenSSL open source
128 * license.
129 *
130 * The Contribution, originally written by Mika Kousa and Pasi Eronen of
131 * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites
132 * support (see RFC 4279) to OpenSSL.
133 *
134 * No patent licenses or other rights except those expressly stated in
135 * the OpenSSL open source license shall be deemed granted or received
136 * expressly, by implication, estoppel, or otherwise.
137 *
138 * No assurances are provided by Nokia that the Contribution does not
139 * infringe the patent or other intellectual property rights of any third
140 * party or that the license provides you with all the necessary rights
141 * to make use of the Contribution.
142 *
143 * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN
144 * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA
145 * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY
146 * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR
147 * OTHERWISE. */
148
David Benjamin9e4e01e2015-09-15 01:48:04 -0400149#include <openssl/ssl.h>
150
David Benjamin880b14e2014-08-25 22:35:07 -0400151#include <assert.h>
David Benjamin22f9bcc2014-07-13 12:29:21 -0400152#include <string.h>
Adam Langley95c29f32014-06-20 12:00:00 -0700153
154#include <openssl/bn.h>
155#include <openssl/buf.h>
David Benjamindc72ff72014-06-25 12:36:10 -0400156#include <openssl/bytestring.h>
Adam Langley95c29f32014-06-20 12:00:00 -0700157#include <openssl/cipher.h>
158#include <openssl/dh.h>
Adam Langley1258b6a2014-06-20 12:00:00 -0700159#include <openssl/ec.h>
160#include <openssl/ecdsa.h>
David Benjaminf0ae1702015-04-07 23:05:04 -0400161#include <openssl/err.h>
Adam Langley95c29f32014-06-20 12:00:00 -0700162#include <openssl/evp.h>
163#include <openssl/hmac.h>
164#include <openssl/md5.h>
165#include <openssl/mem.h>
David Benjamin98193672016-03-25 18:07:11 -0400166#include <openssl/nid.h>
Adam Langley95c29f32014-06-20 12:00:00 -0700167#include <openssl/rand.h>
168#include <openssl/x509.h>
169
David Benjamin2ee94aa2015-04-07 22:38:30 -0400170#include "internal.h"
Adam Langleyaf6e45b2014-11-03 19:34:49 -0800171#include "../crypto/internal.h"
Adam Langley95c29f32014-06-20 12:00:00 -0700172#include "../crypto/dh/internal.h"
173
Adam Langleyfcf25832014-12-18 17:42:32 -0800174
David Benjamindf50eec2016-06-07 16:49:42 -0400175static int ssl3_get_client_hello(SSL *ssl);
176static int ssl3_send_server_hello(SSL *ssl);
David Benjamin9f1dc822016-06-07 17:03:46 -0400177static int ssl3_send_server_certificate(SSL *ssl);
David Benjamindf50eec2016-06-07 16:49:42 -0400178static int ssl3_send_certificate_status(SSL *ssl);
David Benjamindf50eec2016-06-07 16:49:42 -0400179static int ssl3_send_server_key_exchange(SSL *ssl);
180static int ssl3_send_certificate_request(SSL *ssl);
David Benjamin3dcec452016-06-07 17:13:28 -0400181static int ssl3_send_server_hello_done(SSL *ssl);
David Benjamin9f1dc822016-06-07 17:03:46 -0400182static int ssl3_get_client_certificate(SSL *ssl);
David Benjamindf50eec2016-06-07 16:49:42 -0400183static int ssl3_get_client_key_exchange(SSL *ssl);
184static int ssl3_get_cert_verify(SSL *ssl);
David Benjamindf50eec2016-06-07 16:49:42 -0400185static int ssl3_get_next_proto(SSL *ssl);
186static int ssl3_get_channel_id(SSL *ssl);
David Benjamin9f1dc822016-06-07 17:03:46 -0400187static int ssl3_send_new_session_ticket(SSL *ssl);
David Benjamindf50eec2016-06-07 16:49:42 -0400188
David Benjamin0d56f882015-12-19 17:05:56 -0500189int ssl3_accept(SSL *ssl) {
David Benjamin3fa27772015-04-17 22:32:19 -0400190 uint32_t alg_a;
Adam Langleyfcf25832014-12-18 17:42:32 -0800191 int ret = -1;
David Benjamin4e9cc712016-06-01 20:16:03 -0400192 int state, skip = 0;
Adam Langley95c29f32014-06-20 12:00:00 -0700193
David Benjamin0d56f882015-12-19 17:05:56 -0500194 assert(ssl->handshake_func == ssl3_accept);
195 assert(ssl->server);
David Benjaminbeb47022014-11-30 02:58:52 -0500196
Adam Langleyfcf25832014-12-18 17:42:32 -0800197 for (;;) {
David Benjamin0d56f882015-12-19 17:05:56 -0500198 state = ssl->state;
Adam Langley95c29f32014-06-20 12:00:00 -0700199
David Benjamin0d56f882015-12-19 17:05:56 -0500200 switch (ssl->state) {
Adam Langleyfcf25832014-12-18 17:42:32 -0800201 case SSL_ST_ACCEPT:
David Benjamin4e9cc712016-06-01 20:16:03 -0400202 ssl_do_info_callback(ssl, SSL_CB_HANDSHAKE_START, 1);
Adam Langley95c29f32014-06-20 12:00:00 -0700203
Steven Valdez143e8b32016-07-11 13:19:03 -0400204 ssl->s3->hs = ssl_handshake_new(tls13_server_handshake);
David Benjamin481b9d22016-07-27 14:01:59 -0400205 if (ssl->s3->hs == NULL) {
David Benjamin97718f12016-07-08 09:16:50 -0700206 ret = -1;
207 goto end;
Adam Langleyfcf25832014-12-18 17:42:32 -0800208 }
David Benjamin4b755cb2014-12-12 03:58:07 -0500209
David Benjamin6a08da22015-05-08 22:58:12 -0400210 /* Enable a write buffer. This groups handshake messages within a flight
211 * into a single write. */
David Benjaminb095f0f2016-05-05 21:50:24 -0400212 if (!ssl_init_wbio_buffer(ssl)) {
David Benjamin6a08da22015-05-08 22:58:12 -0400213 ret = -1;
214 goto end;
215 }
216
David Benjamin0d56f882015-12-19 17:05:56 -0500217 if (!ssl3_init_handshake_buffer(ssl)) {
David Benjamin3570d732015-06-29 00:28:17 -0400218 OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR);
Adam Langleyfcf25832014-12-18 17:42:32 -0800219 ret = -1;
220 goto end;
221 }
David Benjamin4b755cb2014-12-12 03:58:07 -0500222
David Benjamin0d56f882015-12-19 17:05:56 -0500223 ssl->state = SSL3_ST_SR_CLNT_HELLO_A;
Adam Langleyfcf25832014-12-18 17:42:32 -0800224 break;
David Benjamin4b755cb2014-12-12 03:58:07 -0500225
Adam Langleyfcf25832014-12-18 17:42:32 -0800226 case SSL3_ST_SR_CLNT_HELLO_A:
227 case SSL3_ST_SR_CLNT_HELLO_B:
228 case SSL3_ST_SR_CLNT_HELLO_C:
David Benjamin25fe85b2016-08-09 20:00:32 -0400229 case SSL3_ST_SR_CLNT_HELLO_D:
David Benjamin0d56f882015-12-19 17:05:56 -0500230 ret = ssl3_get_client_hello(ssl);
Steven Valdez143e8b32016-07-11 13:19:03 -0400231 if (ssl->state == SSL_ST_TLS13) {
232 break;
233 }
Adam Langleyfcf25832014-12-18 17:42:32 -0800234 if (ret <= 0) {
235 goto end;
236 }
David Benjamindf50eec2016-06-07 16:49:42 -0400237 ssl->method->received_flight(ssl);
David Benjamin0d56f882015-12-19 17:05:56 -0500238 ssl->state = SSL3_ST_SW_SRVR_HELLO_A;
Adam Langleyfcf25832014-12-18 17:42:32 -0800239 break;
David Benjamin4b755cb2014-12-12 03:58:07 -0500240
Adam Langleyfcf25832014-12-18 17:42:32 -0800241 case SSL3_ST_SW_SRVR_HELLO_A:
242 case SSL3_ST_SW_SRVR_HELLO_B:
David Benjamin0d56f882015-12-19 17:05:56 -0500243 ret = ssl3_send_server_hello(ssl);
Adam Langleyfcf25832014-12-18 17:42:32 -0800244 if (ret <= 0) {
245 goto end;
246 }
Steven Valdez87eab492016-06-27 16:34:59 -0400247 if (ssl->session != NULL) {
David Benjamin47749a62016-06-13 13:56:33 -0400248 ssl->state = SSL3_ST_SW_SESSION_TICKET_A;
Adam Langleyfcf25832014-12-18 17:42:32 -0800249 } else {
David Benjamin0d56f882015-12-19 17:05:56 -0500250 ssl->state = SSL3_ST_SW_CERT_A;
Adam Langleyfcf25832014-12-18 17:42:32 -0800251 }
Adam Langleyfcf25832014-12-18 17:42:32 -0800252 break;
Adam Langley95c29f32014-06-20 12:00:00 -0700253
Adam Langleyfcf25832014-12-18 17:42:32 -0800254 case SSL3_ST_SW_CERT_A:
255 case SSL3_ST_SW_CERT_B:
David Benjaminc032dfa2016-05-12 14:54:57 -0400256 if (ssl_cipher_uses_certificate_auth(ssl->s3->tmp.new_cipher)) {
David Benjamin0d56f882015-12-19 17:05:56 -0500257 ret = ssl3_send_server_certificate(ssl);
Adam Langleyfcf25832014-12-18 17:42:32 -0800258 if (ret <= 0) {
259 goto end;
260 }
Adam Langleyfcf25832014-12-18 17:42:32 -0800261 } else {
262 skip = 1;
Adam Langleyfcf25832014-12-18 17:42:32 -0800263 }
David Benjamin47749a62016-06-13 13:56:33 -0400264 ssl->state = SSL3_ST_SW_CERT_STATUS_A;
Adam Langleyfcf25832014-12-18 17:42:32 -0800265 break;
Adam Langley95c29f32014-06-20 12:00:00 -0700266
Paul Lietaraeeff2c2015-08-12 11:47:11 +0100267 case SSL3_ST_SW_CERT_STATUS_A:
268 case SSL3_ST_SW_CERT_STATUS_B:
David Benjamin47749a62016-06-13 13:56:33 -0400269 if (ssl->s3->tmp.certificate_status_expected) {
270 ret = ssl3_send_certificate_status(ssl);
271 if (ret <= 0) {
272 goto end;
273 }
274 } else {
275 skip = 1;
Paul Lietaraeeff2c2015-08-12 11:47:11 +0100276 }
David Benjamin0d56f882015-12-19 17:05:56 -0500277 ssl->state = SSL3_ST_SW_KEY_EXCH_A;
Paul Lietaraeeff2c2015-08-12 11:47:11 +0100278 break;
279
Adam Langleyfcf25832014-12-18 17:42:32 -0800280 case SSL3_ST_SW_KEY_EXCH_A:
281 case SSL3_ST_SW_KEY_EXCH_B:
nagendra modadugu601448a2015-07-24 09:31:31 -0700282 case SSL3_ST_SW_KEY_EXCH_C:
David Benjamin0d56f882015-12-19 17:05:56 -0500283 alg_a = ssl->s3->tmp.new_cipher->algorithm_auth;
Adam Langley95c29f32014-06-20 12:00:00 -0700284
David Benjamindf50eec2016-06-07 16:49:42 -0400285 /* PSK ciphers send ServerKeyExchange if there is an identity hint. */
David Benjamin0d56f882015-12-19 17:05:56 -0500286 if (ssl_cipher_requires_server_key_exchange(ssl->s3->tmp.new_cipher) ||
287 ((alg_a & SSL_aPSK) && ssl->psk_identity_hint)) {
288 ret = ssl3_send_server_key_exchange(ssl);
David Benjamin6eb000d2015-02-11 01:17:41 -0500289 if (ret <= 0) {
Adam Langleyfcf25832014-12-18 17:42:32 -0800290 goto end;
David Benjamin6eb000d2015-02-11 01:17:41 -0500291 }
Adam Langleyfcf25832014-12-18 17:42:32 -0800292 } else {
293 skip = 1;
294 }
Adam Langley95c29f32014-06-20 12:00:00 -0700295
David Benjamin0d56f882015-12-19 17:05:56 -0500296 ssl->state = SSL3_ST_SW_CERT_REQ_A;
Adam Langleyfcf25832014-12-18 17:42:32 -0800297 break;
Adam Langley95c29f32014-06-20 12:00:00 -0700298
Adam Langleyfcf25832014-12-18 17:42:32 -0800299 case SSL3_ST_SW_CERT_REQ_A:
300 case SSL3_ST_SW_CERT_REQ_B:
David Benjamin0d56f882015-12-19 17:05:56 -0500301 if (ssl->s3->tmp.cert_request) {
302 ret = ssl3_send_certificate_request(ssl);
Adam Langleyfcf25832014-12-18 17:42:32 -0800303 if (ret <= 0) {
304 goto end;
305 }
David Benjamin5c1ce292015-05-26 16:59:43 -0400306 } else {
307 skip = 1;
Adam Langleyfcf25832014-12-18 17:42:32 -0800308 }
David Benjamin0d56f882015-12-19 17:05:56 -0500309 ssl->state = SSL3_ST_SW_SRVR_DONE_A;
Adam Langleyfcf25832014-12-18 17:42:32 -0800310 break;
Adam Langley95c29f32014-06-20 12:00:00 -0700311
Adam Langleyfcf25832014-12-18 17:42:32 -0800312 case SSL3_ST_SW_SRVR_DONE_A:
313 case SSL3_ST_SW_SRVR_DONE_B:
David Benjamin3dcec452016-06-07 17:13:28 -0400314 ret = ssl3_send_server_hello_done(ssl);
Adam Langleyfcf25832014-12-18 17:42:32 -0800315 if (ret <= 0) {
316 goto end;
317 }
David Benjamin0d56f882015-12-19 17:05:56 -0500318 ssl->s3->tmp.next_state = SSL3_ST_SR_CERT_A;
319 ssl->state = SSL3_ST_SW_FLUSH;
Adam Langleyfcf25832014-12-18 17:42:32 -0800320 break;
Adam Langley95c29f32014-06-20 12:00:00 -0700321
Adam Langleyfcf25832014-12-18 17:42:32 -0800322 case SSL3_ST_SR_CERT_A:
David Benjamin0d56f882015-12-19 17:05:56 -0500323 if (ssl->s3->tmp.cert_request) {
324 ret = ssl3_get_client_certificate(ssl);
Adam Langleyfcf25832014-12-18 17:42:32 -0800325 if (ret <= 0) {
326 goto end;
327 }
328 }
David Benjamin0d56f882015-12-19 17:05:56 -0500329 ssl->state = SSL3_ST_SR_KEY_EXCH_A;
Adam Langleyfcf25832014-12-18 17:42:32 -0800330 break;
Adam Langley95c29f32014-06-20 12:00:00 -0700331
Adam Langleyfcf25832014-12-18 17:42:32 -0800332 case SSL3_ST_SR_KEY_EXCH_A:
333 case SSL3_ST_SR_KEY_EXCH_B:
David Benjamin0d56f882015-12-19 17:05:56 -0500334 ret = ssl3_get_client_key_exchange(ssl);
Adam Langleyfcf25832014-12-18 17:42:32 -0800335 if (ret <= 0) {
336 goto end;
337 }
David Benjamin0d56f882015-12-19 17:05:56 -0500338 ssl->state = SSL3_ST_SR_CERT_VRFY_A;
Adam Langleyfcf25832014-12-18 17:42:32 -0800339 break;
Adam Langley95c29f32014-06-20 12:00:00 -0700340
Adam Langleyfcf25832014-12-18 17:42:32 -0800341 case SSL3_ST_SR_CERT_VRFY_A:
David Benjamin0d56f882015-12-19 17:05:56 -0500342 ret = ssl3_get_cert_verify(ssl);
Adam Langleyfcf25832014-12-18 17:42:32 -0800343 if (ret <= 0) {
344 goto end;
345 }
Adam Langley95c29f32014-06-20 12:00:00 -0700346
David Benjamin0d56f882015-12-19 17:05:56 -0500347 ssl->state = SSL3_ST_SR_CHANGE;
Adam Langleyfcf25832014-12-18 17:42:32 -0800348 break;
Adam Langley95c29f32014-06-20 12:00:00 -0700349
David Benjamina41280d2015-11-26 02:16:49 -0500350 case SSL3_ST_SR_CHANGE:
David Benjaminf0ee9072016-06-15 17:44:37 -0400351 ret = ssl->method->read_change_cipher_spec(ssl);
David Benjamina41280d2015-11-26 02:16:49 -0500352 if (ret <= 0) {
353 goto end;
354 }
Adam Langley95c29f32014-06-20 12:00:00 -0700355
David Benjamin57997da2015-12-25 15:48:39 -0500356 if (!tls1_change_cipher_state(ssl, SSL3_CHANGE_CIPHER_SERVER_READ)) {
Adam Langleyfcf25832014-12-18 17:42:32 -0800357 ret = -1;
358 goto end;
359 }
David Benjamina41280d2015-11-26 02:16:49 -0500360
David Benjamin47749a62016-06-13 13:56:33 -0400361 ssl->state = SSL3_ST_SR_NEXT_PROTO_A;
Adam Langleyfcf25832014-12-18 17:42:32 -0800362 break;
Adam Langley1258b6a2014-06-20 12:00:00 -0700363
Adam Langleyfcf25832014-12-18 17:42:32 -0800364 case SSL3_ST_SR_NEXT_PROTO_A:
David Benjamin47749a62016-06-13 13:56:33 -0400365 if (ssl->s3->next_proto_neg_seen) {
366 ret = ssl3_get_next_proto(ssl);
367 if (ret <= 0) {
368 goto end;
369 }
Adam Langleyfcf25832014-12-18 17:42:32 -0800370 } else {
David Benjamin47749a62016-06-13 13:56:33 -0400371 skip = 1;
Adam Langleyfcf25832014-12-18 17:42:32 -0800372 }
David Benjamin47749a62016-06-13 13:56:33 -0400373 ssl->state = SSL3_ST_SR_CHANNEL_ID_A;
Adam Langleyfcf25832014-12-18 17:42:32 -0800374 break;
Adam Langley1258b6a2014-06-20 12:00:00 -0700375
Adam Langleyfcf25832014-12-18 17:42:32 -0800376 case SSL3_ST_SR_CHANNEL_ID_A:
David Benjamin47749a62016-06-13 13:56:33 -0400377 if (ssl->s3->tlsext_channel_id_valid) {
378 ret = ssl3_get_channel_id(ssl);
379 if (ret <= 0) {
380 goto end;
381 }
382 } else {
383 skip = 1;
Adam Langleyfcf25832014-12-18 17:42:32 -0800384 }
David Benjamin0d56f882015-12-19 17:05:56 -0500385 ssl->state = SSL3_ST_SR_FINISHED_A;
Adam Langleyfcf25832014-12-18 17:42:32 -0800386 break;
Adam Langley1258b6a2014-06-20 12:00:00 -0700387
Adam Langleyfcf25832014-12-18 17:42:32 -0800388 case SSL3_ST_SR_FINISHED_A:
David Benjamin1e6d6df2016-05-13 18:28:17 -0400389 ret = ssl3_get_finished(ssl);
Adam Langleyfcf25832014-12-18 17:42:32 -0800390 if (ret <= 0) {
391 goto end;
392 }
Adam Langley95c29f32014-06-20 12:00:00 -0700393
David Benjamindf50eec2016-06-07 16:49:42 -0400394 ssl->method->received_flight(ssl);
Steven Valdez87eab492016-06-27 16:34:59 -0400395 if (ssl->session != NULL) {
David Benjamin0d56f882015-12-19 17:05:56 -0500396 ssl->state = SSL_ST_OK;
Adam Langleyfcf25832014-12-18 17:42:32 -0800397 } else {
David Benjamin47749a62016-06-13 13:56:33 -0400398 ssl->state = SSL3_ST_SW_SESSION_TICKET_A;
Adam Langleyfcf25832014-12-18 17:42:32 -0800399 }
David Benjamindf50eec2016-06-07 16:49:42 -0400400
Steven Valdez87eab492016-06-27 16:34:59 -0400401 /* If this is a full handshake with ChannelID then record the handshake
402 * hashes in |ssl->s3->new_session| in case we need them to verify a
403 * ChannelID signature on a resumption of this session in the future. */
404 if (ssl->session == NULL && ssl->s3->tlsext_channel_id_valid) {
David Benjamin0d56f882015-12-19 17:05:56 -0500405 ret = tls1_record_handshake_hashes_for_channel_id(ssl);
Adam Langleyfcf25832014-12-18 17:42:32 -0800406 if (ret <= 0) {
407 goto end;
408 }
409 }
Adam Langleyfcf25832014-12-18 17:42:32 -0800410 break;
Adam Langley95c29f32014-06-20 12:00:00 -0700411
Adam Langleyfcf25832014-12-18 17:42:32 -0800412 case SSL3_ST_SW_SESSION_TICKET_A:
413 case SSL3_ST_SW_SESSION_TICKET_B:
David Benjamin47749a62016-06-13 13:56:33 -0400414 if (ssl->tlsext_ticket_expected) {
415 ret = ssl3_send_new_session_ticket(ssl);
416 if (ret <= 0) {
417 goto end;
418 }
419 } else {
420 skip = 1;
Adam Langleyfcf25832014-12-18 17:42:32 -0800421 }
David Benjamin352d0a92016-06-28 11:22:02 -0400422 ssl->state = SSL3_ST_SW_CHANGE;
Adam Langleyfcf25832014-12-18 17:42:32 -0800423 break;
Adam Langley95c29f32014-06-20 12:00:00 -0700424
David Benjamin352d0a92016-06-28 11:22:02 -0400425 case SSL3_ST_SW_CHANGE:
426 ret = ssl->method->send_change_cipher_spec(ssl);
Adam Langleyfcf25832014-12-18 17:42:32 -0800427 if (ret <= 0) {
428 goto end;
429 }
David Benjamin0d56f882015-12-19 17:05:56 -0500430 ssl->state = SSL3_ST_SW_FINISHED_A;
Adam Langley95c29f32014-06-20 12:00:00 -0700431
David Benjamin57997da2015-12-25 15:48:39 -0500432 if (!tls1_change_cipher_state(ssl, SSL3_CHANGE_CIPHER_SERVER_WRITE)) {
Adam Langleyfcf25832014-12-18 17:42:32 -0800433 ret = -1;
434 goto end;
435 }
436 break;
Adam Langley95c29f32014-06-20 12:00:00 -0700437
Adam Langleyfcf25832014-12-18 17:42:32 -0800438 case SSL3_ST_SW_FINISHED_A:
439 case SSL3_ST_SW_FINISHED_B:
David Benjamin0d56f882015-12-19 17:05:56 -0500440 ret = ssl3_send_finished(ssl, SSL3_ST_SW_FINISHED_A,
David Benjaminbaa12162015-12-29 19:13:58 -0500441 SSL3_ST_SW_FINISHED_B);
Adam Langleyfcf25832014-12-18 17:42:32 -0800442 if (ret <= 0) {
443 goto end;
444 }
David Benjamin0d56f882015-12-19 17:05:56 -0500445 ssl->state = SSL3_ST_SW_FLUSH;
Steven Valdez87eab492016-06-27 16:34:59 -0400446 if (ssl->session != NULL) {
David Benjamin0d56f882015-12-19 17:05:56 -0500447 ssl->s3->tmp.next_state = SSL3_ST_SR_CHANGE;
Adam Langleyfcf25832014-12-18 17:42:32 -0800448 } else {
David Benjamin0d56f882015-12-19 17:05:56 -0500449 ssl->s3->tmp.next_state = SSL_ST_OK;
Adam Langleyfcf25832014-12-18 17:42:32 -0800450 }
Adam Langleyfcf25832014-12-18 17:42:32 -0800451 break;
Adam Langley95c29f32014-06-20 12:00:00 -0700452
David Benjamin9f1dc822016-06-07 17:03:46 -0400453 case SSL3_ST_SW_FLUSH:
454 if (BIO_flush(ssl->wbio) <= 0) {
455 ssl->rwstate = SSL_WRITING;
456 ret = -1;
457 goto end;
458 }
459
460 ssl->state = ssl->s3->tmp.next_state;
461 if (ssl->state != SSL_ST_OK) {
462 ssl->method->expect_flight(ssl);
463 }
464 break;
465
Steven Valdez143e8b32016-07-11 13:19:03 -0400466 case SSL_ST_TLS13:
467 ret = tls13_handshake(ssl);
468 if (ret <= 0) {
469 goto end;
470 }
471 ssl->state = SSL_ST_OK;
472 break;
473
Adam Langleyfcf25832014-12-18 17:42:32 -0800474 case SSL_ST_OK:
David Benjamin4497e582016-07-27 17:51:49 -0400475 /* Clean a few things up. */
David Benjamin0d56f882015-12-19 17:05:56 -0500476 ssl3_cleanup_key_block(ssl);
David Benjamin4497e582016-07-27 17:51:49 -0400477 ssl->method->release_current_message(ssl, 1 /* free_buffer */);
Adam Langley95c29f32014-06-20 12:00:00 -0700478
Steven Valdez87eab492016-06-27 16:34:59 -0400479 /* If we aren't retaining peer certificates then we can discard it
480 * now. */
481 if (ssl->s3->new_session != NULL &&
482 ssl->ctx->retain_only_sha256_of_client_certs) {
483 X509_free(ssl->s3->new_session->peer);
484 ssl->s3->new_session->peer = NULL;
485 sk_X509_pop_free(ssl->s3->new_session->cert_chain, X509_free);
486 ssl->s3->new_session->cert_chain = NULL;
487 }
488
489 SSL_SESSION_free(ssl->s3->established_session);
490 if (ssl->session != NULL) {
David Benjaminb9195402016-08-05 10:51:43 -0400491 SSL_SESSION_up_ref(ssl->session);
492 ssl->s3->established_session = ssl->session;
Steven Valdez87eab492016-06-27 16:34:59 -0400493 } else {
494 ssl->s3->established_session = ssl->s3->new_session;
495 ssl->s3->established_session->not_resumable = 0;
496 ssl->s3->new_session = NULL;
497 }
498
Adam Langleyfcf25832014-12-18 17:42:32 -0800499 /* remove buffering on output */
David Benjamin0d56f882015-12-19 17:05:56 -0500500 ssl_free_wbio_buffer(ssl);
Adam Langley95c29f32014-06-20 12:00:00 -0700501
Steven Valdez143e8b32016-07-11 13:19:03 -0400502 ssl_handshake_free(ssl->s3->hs);
503 ssl->s3->hs = NULL;
504
David Benjamin0d56f882015-12-19 17:05:56 -0500505 ssl->s3->initial_handshake_complete = 1;
Adam Langley95c29f32014-06-20 12:00:00 -0700506
David Benjamin0d56f882015-12-19 17:05:56 -0500507 ssl_update_cache(ssl, SSL_SESS_CACHE_SERVER);
Adam Langley95c29f32014-06-20 12:00:00 -0700508
David Benjamin4e9cc712016-06-01 20:16:03 -0400509 ssl_do_info_callback(ssl, SSL_CB_HANDSHAKE_DONE, 1);
Adam Langley75872532014-06-20 12:00:00 -0700510
Adam Langleyfcf25832014-12-18 17:42:32 -0800511 ret = 1;
512 goto end;
Adam Langley95c29f32014-06-20 12:00:00 -0700513
Adam Langleyfcf25832014-12-18 17:42:32 -0800514 default:
David Benjamin3570d732015-06-29 00:28:17 -0400515 OPENSSL_PUT_ERROR(SSL, SSL_R_UNKNOWN_STATE);
Adam Langleyfcf25832014-12-18 17:42:32 -0800516 ret = -1;
517 goto end;
518 }
Adam Langley95c29f32014-06-20 12:00:00 -0700519
David Benjamin4e9cc712016-06-01 20:16:03 -0400520 if (!ssl->s3->tmp.reuse_message && !skip && ssl->state != state) {
521 int new_state = ssl->state;
David Benjamin0d56f882015-12-19 17:05:56 -0500522 ssl->state = state;
David Benjamin4e9cc712016-06-01 20:16:03 -0400523 ssl_do_info_callback(ssl, SSL_CB_ACCEPT_LOOP, 1);
David Benjamin0d56f882015-12-19 17:05:56 -0500524 ssl->state = new_state;
Adam Langleyfcf25832014-12-18 17:42:32 -0800525 }
526 skip = 0;
527 }
528
Adam Langley95c29f32014-06-20 12:00:00 -0700529end:
David Benjamin4e9cc712016-06-01 20:16:03 -0400530 ssl_do_info_callback(ssl, SSL_CB_ACCEPT_EXIT, ret);
Adam Langleyfcf25832014-12-18 17:42:32 -0800531 return ret;
532}
Adam Langley95c29f32014-06-20 12:00:00 -0700533
David Benjamin1deb41b2016-08-09 19:36:38 -0400534int ssl_client_cipher_list_contains_cipher(
535 const struct ssl_early_callback_ctx *client_hello, uint16_t id) {
536 CBS cipher_suites;
537 CBS_init(&cipher_suites, client_hello->cipher_suites,
538 client_hello->cipher_suites_len);
539
540 while (CBS_len(&cipher_suites) > 0) {
541 uint16_t got_id;
542 if (!CBS_get_u16(&cipher_suites, &got_id)) {
543 return 0;
544 }
545
546 if (got_id == id) {
547 return 1;
548 }
549 }
550
551 return 0;
552}
553
David Benjamin25fe85b2016-08-09 20:00:32 -0400554static int negotiate_version(
555 SSL *ssl, int *out_alert,
556 const struct ssl_early_callback_ctx *client_hello) {
557 uint16_t min_version, max_version;
558 if (!ssl_get_version_range(ssl, &min_version, &max_version)) {
559 *out_alert = SSL_AD_PROTOCOL_VERSION;
560 return 0;
561 }
562
563 uint16_t client_version =
564 ssl->method->version_from_wire(client_hello->version);
565 ssl->client_version = client_hello->version;
566
567 /* Select the version to use. */
568 uint16_t version = client_version;
569 if (version > max_version) {
570 version = max_version;
571 }
572
573 if (version < min_version) {
574 OPENSSL_PUT_ERROR(SSL, SSL_R_UNSUPPORTED_PROTOCOL);
575 *out_alert = SSL_AD_PROTOCOL_VERSION;
576 return 0;
577 }
578
579 /* Handle FALLBACK_SCSV. */
580 if (ssl_client_cipher_list_contains_cipher(client_hello,
581 SSL3_CK_FALLBACK_SCSV & 0xffff) &&
582 version < max_version) {
583 OPENSSL_PUT_ERROR(SSL, SSL_R_INAPPROPRIATE_FALLBACK);
584 *out_alert = SSL3_AD_INAPPROPRIATE_FALLBACK;
585 return 0;
586 }
587
588 ssl->version = ssl->method->version_to_wire(version);
589 ssl->s3->enc_method = ssl3_get_enc_method(version);
590 assert(ssl->s3->enc_method != NULL);
591
592 /* At this point, the connection's version is known and |ssl->version| is
593 * fixed. Begin enforcing the record-layer version. */
594 ssl->s3->have_version = 1;
595
596 return 1;
597}
598
David Benjamindf50eec2016-06-07 16:49:42 -0400599static int ssl3_get_client_hello(SSL *ssl) {
David Benjamin09eb6552016-07-08 14:32:11 -0700600 int al = SSL_AD_INTERNAL_ERROR, ret = -1;
David Benjamine3aa1d92015-06-16 15:34:50 -0400601 SSL_SESSION *session = NULL;
Adam Langley95c29f32014-06-20 12:00:00 -0700602
David Benjamine14ff062016-08-09 16:21:24 -0400603 if (ssl->state == SSL3_ST_SR_CLNT_HELLO_A) {
604 /* The first time around, read the ClientHello. */
605 int msg_ret = ssl->method->ssl_get_message(ssl, SSL3_MT_CLIENT_HELLO,
606 ssl_hash_message);
607 if (msg_ret <= 0) {
608 return msg_ret;
David Benjamin09eb6552016-07-08 14:32:11 -0700609 }
David Benjamin22f9bcc2014-07-13 12:29:21 -0400610
David Benjamine14ff062016-08-09 16:21:24 -0400611 ssl->state = SSL3_ST_SR_CLNT_HELLO_B;
Adam Langleyfcf25832014-12-18 17:42:32 -0800612 }
Adam Langley95c29f32014-06-20 12:00:00 -0700613
David Benjamine14ff062016-08-09 16:21:24 -0400614 struct ssl_early_callback_ctx client_hello;
615 if (!ssl_early_callback_init(ssl, &client_hello, ssl->init_msg,
616 ssl->init_num)) {
Adam Langleyfcf25832014-12-18 17:42:32 -0800617 al = SSL_AD_DECODE_ERROR;
David Benjamin3570d732015-06-29 00:28:17 -0400618 OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR);
Adam Langleyfcf25832014-12-18 17:42:32 -0800619 goto f_err;
620 }
Adam Langley95c29f32014-06-20 12:00:00 -0700621
David Benjamine14ff062016-08-09 16:21:24 -0400622 if (ssl->state == SSL3_ST_SR_CLNT_HELLO_B) {
623 /* Unlike other callbacks, the early callback is not run a second time if
624 * paused. */
625 ssl->state = SSL3_ST_SR_CLNT_HELLO_C;
David Benjaminb6a0a512016-06-21 10:33:21 -0400626
David Benjamine14ff062016-08-09 16:21:24 -0400627 /* Run the early callback. */
628 if (ssl->ctx->select_certificate_cb != NULL) {
629 switch (ssl->ctx->select_certificate_cb(&client_hello)) {
630 case 0:
631 ssl->rwstate = SSL_CERTIFICATE_SELECTION_PENDING;
632 goto err;
633
634 case -1:
635 /* Connection rejected. */
636 al = SSL_AD_ACCESS_DENIED;
637 OPENSSL_PUT_ERROR(SSL, SSL_R_CONNECTION_REJECTED);
638 goto f_err;
639
640 default:
641 /* fallthrough */;
642 }
643 }
644 }
645
David Benjamin25fe85b2016-08-09 20:00:32 -0400646 /* Negotiate the protocol version if we have not done so yet. */
David Benjamin0d56f882015-12-19 17:05:56 -0500647 if (!ssl->s3->have_version) {
David Benjamin25fe85b2016-08-09 20:00:32 -0400648 if (!negotiate_version(ssl, &al, &client_hello)) {
Adam Langleyfcf25832014-12-18 17:42:32 -0800649 goto f_err;
650 }
David Benjamin1deb41b2016-08-09 19:36:38 -0400651
David Benjamin25fe85b2016-08-09 20:00:32 -0400652 if (ssl3_protocol_version(ssl) >= TLS1_3_VERSION) {
653 ssl->state = SSL_ST_TLS13;
654 return 1;
655 }
656 }
657
658 if (ssl->state == SSL3_ST_SR_CLNT_HELLO_C) {
659 /* Load the client random. */
660 if (client_hello.random_len != SSL3_RANDOM_SIZE) {
661 OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR);
662 return -1;
663 }
664 memcpy(ssl->s3->client_random, client_hello.random,
665 client_hello.random_len);
666
667 /* Determine whether we are doing session resumption. */
668 int send_new_ticket = 0;
669 switch (
670 ssl_get_prev_session(ssl, &session, &send_new_ticket, &client_hello)) {
671 case ssl_session_success:
672 break;
673 case ssl_session_error:
674 goto err;
675 case ssl_session_retry:
676 ssl->rwstate = SSL_PENDING_SESSION;
677 goto err;
678 }
679 ssl->tlsext_ticket_expected = send_new_ticket;
680
681 /* The EMS state is needed when making the resumption decision, but
682 * extensions are not normally parsed until later. This detects the EMS
683 * extension for the resumption decision and it's checked against the result
684 * of the normal parse later in this function. */
685 CBS ems;
686 int have_extended_master_secret =
687 ssl->version != SSL3_VERSION &&
688 ssl_early_callback_get_extension(&client_hello, &ems,
689 TLSEXT_TYPE_extended_master_secret) &&
690 CBS_len(&ems) == 0;
691
692 int has_session = 0;
693 if (session != NULL) {
694 if (session->extended_master_secret &&
695 !have_extended_master_secret) {
696 /* A ClientHello without EMS that attempts to resume a session with EMS
697 * is fatal to the connection. */
698 al = SSL_AD_HANDSHAKE_FAILURE;
699 OPENSSL_PUT_ERROR(SSL, SSL_R_RESUMED_EMS_SESSION_WITHOUT_EMS_EXTENSION);
700 goto f_err;
701 }
702
703 has_session =
704 /* Only resume if the session's version matches the negotiated
705 * version: most clients do not accept a mismatch. */
706 ssl->version == session->ssl_version &&
707 /* If the client offers the EMS extension, but the previous session
708 * didn't use it, then negotiate a new session. */
709 have_extended_master_secret == session->extended_master_secret;
710 }
711
712 if (has_session) {
713 /* Use the old session. */
714 ssl->session = session;
715 session = NULL;
716 ssl->verify_result = ssl->session->verify_result;
717 } else {
718 SSL_set_session(ssl, NULL);
719 if (!ssl_get_new_session(ssl, 1 /* server */)) {
720 goto err;
721 }
722
723 /* Clear the session ID if we want the session to be single-use. */
724 if (!(ssl->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER)) {
725 ssl->s3->new_session->session_id_length = 0;
726 }
727 }
728
729 if (ssl->ctx->dos_protection_cb != NULL &&
730 ssl->ctx->dos_protection_cb(&client_hello) == 0) {
731 /* Connection rejected for DOS reasons. */
732 al = SSL_AD_ACCESS_DENIED;
733 OPENSSL_PUT_ERROR(SSL, SSL_R_CONNECTION_REJECTED);
David Benjamin1deb41b2016-08-09 19:36:38 -0400734 goto f_err;
735 }
736
David Benjamin25fe85b2016-08-09 20:00:32 -0400737 /* Only null compression is supported. */
738 if (memchr(client_hello.compression_methods, 0,
739 client_hello.compression_methods_len) == NULL) {
740 al = SSL_AD_ILLEGAL_PARAMETER;
741 OPENSSL_PUT_ERROR(SSL, SSL_R_NO_COMPRESSION_SPECIFIED);
742 goto f_err;
743 }
David Benjamin8b8c0062014-11-23 02:47:52 -0500744
David Benjamin25fe85b2016-08-09 20:00:32 -0400745 /* TLS extensions. */
746 if (!ssl_parse_clienthello_tlsext(ssl, &client_hello)) {
747 OPENSSL_PUT_ERROR(SSL, SSL_R_PARSE_TLSEXT);
David Benjamine3aa1d92015-06-16 15:34:50 -0400748 goto err;
David Benjamin25fe85b2016-08-09 20:00:32 -0400749 }
David Benjamin4b30b282015-05-26 16:37:58 -0400750
David Benjamin25fe85b2016-08-09 20:00:32 -0400751 if (have_extended_master_secret != ssl->s3->tmp.extended_master_secret) {
752 al = SSL_AD_INTERNAL_ERROR;
753 OPENSSL_PUT_ERROR(SSL, SSL_R_EMS_STATE_INCONSISTENT);
Adam Langleyba5934b2015-06-02 10:50:35 -0700754 goto f_err;
Adam Langleyfcf25832014-12-18 17:42:32 -0800755 }
Adam Langleyba5934b2015-06-02 10:50:35 -0700756
David Benjamin25fe85b2016-08-09 20:00:32 -0400757 ssl->state = SSL3_ST_SR_CLNT_HELLO_D;
Adam Langleyba5934b2015-06-02 10:50:35 -0700758 }
759
David Benjamin25fe85b2016-08-09 20:00:32 -0400760 /* Determine the remaining connection parameters. This is a separate state so
761 * |cert_cb| does not cause earlier logic to run multiple times. */
762 assert(ssl->state == SSL3_ST_SR_CLNT_HELLO_D);
763
764 if (ssl->session != NULL) {
765 /* Check that the cipher is in the list. */
766 if (!ssl_client_cipher_list_contains_cipher(
767 &client_hello, (uint16_t)ssl->session->cipher->id)) {
768 al = SSL_AD_ILLEGAL_PARAMETER;
769 OPENSSL_PUT_ERROR(SSL, SSL_R_REQUIRED_CIPHER_MISSING);
770 goto f_err;
771 }
772
773 ssl->s3->tmp.new_cipher = ssl->session->cipher;
774 ssl->s3->tmp.cert_request = 0;
David Benjamin56380462015-10-10 14:59:09 -0400775 } else {
David Benjamin25fe85b2016-08-09 20:00:32 -0400776 /* Call |cert_cb| to update server certificates if required. */
777 if (ssl->cert->cert_cb != NULL) {
David Benjamin0d56f882015-12-19 17:05:56 -0500778 int rv = ssl->cert->cert_cb(ssl, ssl->cert->cert_cb_arg);
Adam Langleyfcf25832014-12-18 17:42:32 -0800779 if (rv == 0) {
780 al = SSL_AD_INTERNAL_ERROR;
David Benjamin3570d732015-06-29 00:28:17 -0400781 OPENSSL_PUT_ERROR(SSL, SSL_R_CERT_CB_ERROR);
Adam Langleyfcf25832014-12-18 17:42:32 -0800782 goto f_err;
783 }
784 if (rv < 0) {
David Benjamin0d56f882015-12-19 17:05:56 -0500785 ssl->rwstate = SSL_X509_LOOKUP;
Adam Langleyfcf25832014-12-18 17:42:32 -0800786 goto err;
787 }
Adam Langleyfcf25832014-12-18 17:42:32 -0800788 }
Adam Langleyfcf25832014-12-18 17:42:32 -0800789
David Benjamin25fe85b2016-08-09 20:00:32 -0400790 const SSL_CIPHER *c =
791 ssl3_choose_cipher(ssl, &client_hello, ssl_get_cipher_preferences(ssl));
Adam Langleyfcf25832014-12-18 17:42:32 -0800792 if (c == NULL) {
793 al = SSL_AD_HANDSHAKE_FAILURE;
David Benjamin3570d732015-06-29 00:28:17 -0400794 OPENSSL_PUT_ERROR(SSL, SSL_R_NO_SHARED_CIPHER);
Adam Langleyfcf25832014-12-18 17:42:32 -0800795 goto f_err;
796 }
David Benjaminfddbadc2016-08-09 19:53:00 -0400797
Steven Valdez87eab492016-06-27 16:34:59 -0400798 ssl->s3->new_session->cipher = c;
David Benjamin0d56f882015-12-19 17:05:56 -0500799 ssl->s3->tmp.new_cipher = c;
David Benjamin5c1ce292015-05-26 16:59:43 -0400800
801 /* Determine whether to request a client certificate. */
David Benjamin0d56f882015-12-19 17:05:56 -0500802 ssl->s3->tmp.cert_request = !!(ssl->verify_mode & SSL_VERIFY_PEER);
David Benjamin5c1ce292015-05-26 16:59:43 -0400803 /* Only request a certificate if Channel ID isn't negotiated. */
David Benjamin0d56f882015-12-19 17:05:56 -0500804 if ((ssl->verify_mode & SSL_VERIFY_PEER_IF_NO_OBC) &&
805 ssl->s3->tlsext_channel_id_valid) {
806 ssl->s3->tmp.cert_request = 0;
David Benjamin5c1ce292015-05-26 16:59:43 -0400807 }
David Benjaminc032dfa2016-05-12 14:54:57 -0400808 /* CertificateRequest may only be sent in certificate-based ciphers. */
809 if (!ssl_cipher_uses_certificate_auth(ssl->s3->tmp.new_cipher)) {
David Benjamin0d56f882015-12-19 17:05:56 -0500810 ssl->s3->tmp.cert_request = 0;
David Benjamin5c1ce292015-05-26 16:59:43 -0400811 }
Adam Langleyfcf25832014-12-18 17:42:32 -0800812 }
813
David Benjamin9550c3a2015-08-05 08:50:34 -0400814 /* Now that the cipher is known, initialize the handshake hash. */
David Benjamin0d56f882015-12-19 17:05:56 -0500815 if (!ssl3_init_handshake_hash(ssl)) {
David Benjamin9550c3a2015-08-05 08:50:34 -0400816 goto f_err;
817 }
818
Steven Valdez2b8415e2016-06-30 13:27:23 -0400819 /* Release the handshake buffer if client authentication isn't required. */
820 if (!ssl->s3->tmp.cert_request) {
David Benjamin0d56f882015-12-19 17:05:56 -0500821 ssl3_free_handshake_buffer(ssl);
Adam Langleyfcf25832014-12-18 17:42:32 -0800822 }
823
David Benjamin0bd71eb2015-12-01 14:14:40 -0500824 ret = 1;
Adam Langleyfcf25832014-12-18 17:42:32 -0800825
826 if (0) {
827 f_err:
David Benjamin0d56f882015-12-19 17:05:56 -0500828 ssl3_send_alert(ssl, SSL3_AL_FATAL, al);
Adam Langleyfcf25832014-12-18 17:42:32 -0800829 }
830
Adam Langley95c29f32014-06-20 12:00:00 -0700831err:
David Benjamine3aa1d92015-06-16 15:34:50 -0400832 SSL_SESSION_free(session);
Adam Langleyfcf25832014-12-18 17:42:32 -0800833 return ret;
834}
Adam Langley95c29f32014-06-20 12:00:00 -0700835
David Benjamindf50eec2016-06-07 16:49:42 -0400836static int ssl3_send_server_hello(SSL *ssl) {
David Benjamin56380462015-10-10 14:59:09 -0400837 if (ssl->state == SSL3_ST_SW_SRVR_HELLO_B) {
David Benjamin75836432016-06-17 18:48:29 -0400838 return ssl->method->write_message(ssl);
Adam Langleyfcf25832014-12-18 17:42:32 -0800839 }
Adam Langley95c29f32014-06-20 12:00:00 -0700840
David Benjamin56380462015-10-10 14:59:09 -0400841 assert(ssl->state == SSL3_ST_SW_SRVR_HELLO_A);
842
843 /* We only accept ChannelIDs on connections with ECDHE in order to avoid a
844 * known attack while we fix ChannelID itself. */
845 if (ssl->s3->tlsext_channel_id_valid &&
846 (ssl->s3->tmp.new_cipher->algorithm_mkey & SSL_kECDHE) == 0) {
847 ssl->s3->tlsext_channel_id_valid = 0;
848 }
849
850 /* If this is a resumption and the original handshake didn't support
851 * ChannelID then we didn't record the original handshake hashes in the
852 * session and so cannot resume with ChannelIDs. */
Steven Valdez87eab492016-06-27 16:34:59 -0400853 if (ssl->session != NULL &&
854 ssl->session->original_handshake_hash_len == 0) {
David Benjamin56380462015-10-10 14:59:09 -0400855 ssl->s3->tlsext_channel_id_valid = 0;
856 }
857
David Benjamin721e8b72016-08-03 13:13:17 -0400858 struct timeval now;
859 ssl_get_current_time(ssl, &now);
860 ssl->s3->server_random[0] = now.tv_sec >> 24;
861 ssl->s3->server_random[1] = now.tv_sec >> 16;
862 ssl->s3->server_random[2] = now.tv_sec >> 8;
863 ssl->s3->server_random[3] = now.tv_sec;
David Benjamin1f61f0d2016-07-10 12:20:35 -0400864 if (!RAND_bytes(ssl->s3->server_random + 4, SSL3_RANDOM_SIZE - 4)) {
David Benjamin56380462015-10-10 14:59:09 -0400865 return -1;
866 }
867
David Benjamin1f61f0d2016-07-10 12:20:35 -0400868 /* Fill in the TLS 1.2 downgrade signal. See draft-ietf-tls-tls13-14.
869 *
870 * TODO(davidben): Also implement the TLS 1.1 sentinel when things have
871 * settled down. */
872 uint16_t min_version, max_version;
873 if (!ssl_get_version_range(ssl, &min_version, &max_version)) {
874 return -1;
875 }
876 if (max_version >= TLS1_3_VERSION &&
877 ssl3_protocol_version(ssl) <= TLS1_2_VERSION) {
878 static const uint8_t kDowngradeTLS12[8] = {0x44, 0x4f, 0x57, 0x4e,
879 0x47, 0x52, 0x44, 0x01};
880 memcpy(ssl->s3->server_random + SSL3_RANDOM_SIZE - 8, kDowngradeTLS12, 8);
881 }
882
Steven Valdez87eab492016-06-27 16:34:59 -0400883 const SSL_SESSION *session = ssl->s3->new_session;
884 if (ssl->session != NULL) {
885 session = ssl->session;
886 }
887
David Benjamin75836432016-06-17 18:48:29 -0400888 CBB cbb, body, session_id;
889 if (!ssl->method->init_message(ssl, &cbb, &body, SSL3_MT_SERVER_HELLO) ||
890 !CBB_add_u16(&body, ssl->version) ||
891 !CBB_add_bytes(&body, ssl->s3->server_random, SSL3_RANDOM_SIZE) ||
892 !CBB_add_u8_length_prefixed(&body, &session_id) ||
Steven Valdez87eab492016-06-27 16:34:59 -0400893 !CBB_add_bytes(&session_id, session->session_id,
894 session->session_id_length) ||
David Benjamin75836432016-06-17 18:48:29 -0400895 !CBB_add_u16(&body, ssl_cipher_get_value(ssl->s3->tmp.new_cipher)) ||
896 !CBB_add_u8(&body, 0 /* no compression */) ||
897 !ssl_add_serverhello_tlsext(ssl, &body) ||
898 !ssl->method->finish_message(ssl, &cbb)) {
David Benjamin56380462015-10-10 14:59:09 -0400899 OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR);
900 CBB_cleanup(&cbb);
901 return -1;
902 }
903
904 ssl->state = SSL3_ST_SW_SRVR_HELLO_B;
David Benjamin75836432016-06-17 18:48:29 -0400905 return ssl->method->write_message(ssl);
Adam Langleyfcf25832014-12-18 17:42:32 -0800906}
Adam Langley95c29f32014-06-20 12:00:00 -0700907
David Benjamin9f1dc822016-06-07 17:03:46 -0400908static int ssl3_send_server_certificate(SSL *ssl) {
David Benjamin75836432016-06-17 18:48:29 -0400909 if (ssl->state == SSL3_ST_SW_CERT_B) {
910 return ssl->method->write_message(ssl);
David Benjamin9f1dc822016-06-07 17:03:46 -0400911 }
912
David Benjamin32a66d52016-07-13 22:03:11 -0400913 if (!ssl_has_certificate(ssl)) {
914 OPENSSL_PUT_ERROR(SSL, SSL_R_NO_CERTIFICATE_SET);
915 return 0;
916 }
917
David Benjamin75836432016-06-17 18:48:29 -0400918 if (!ssl3_output_cert_chain(ssl)) {
919 return 0;
920 }
921 ssl->state = SSL3_ST_SW_CERT_B;
922 return ssl->method->write_message(ssl);
David Benjamin9f1dc822016-06-07 17:03:46 -0400923}
924
David Benjamindf50eec2016-06-07 16:49:42 -0400925static int ssl3_send_certificate_status(SSL *ssl) {
David Benjamin75836432016-06-17 18:48:29 -0400926 if (ssl->state == SSL3_ST_SW_CERT_STATUS_B) {
927 return ssl->method->write_message(ssl);
Paul Lietaraeeff2c2015-08-12 11:47:11 +0100928 }
929
David Benjamin75836432016-06-17 18:48:29 -0400930 CBB cbb, body, ocsp_response;
931 if (!ssl->method->init_message(ssl, &cbb, &body,
932 SSL3_MT_CERTIFICATE_STATUS) ||
933 !CBB_add_u8(&body, TLSEXT_STATUSTYPE_ocsp) ||
934 !CBB_add_u24_length_prefixed(&body, &ocsp_response) ||
935 !CBB_add_bytes(&ocsp_response, ssl->ctx->ocsp_response,
936 ssl->ctx->ocsp_response_length) ||
937 !ssl->method->finish_message(ssl, &cbb)) {
938 OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR);
939 CBB_cleanup(&cbb);
940 return -1;
941 }
942
943 ssl->state = SSL3_ST_SW_CERT_STATUS_B;
944 return ssl->method->write_message(ssl);
Paul Lietaraeeff2c2015-08-12 11:47:11 +0100945}
946
David Benjamindf50eec2016-06-07 16:49:42 -0400947static int ssl3_send_server_key_exchange(SSL *ssl) {
David Benjamin2a0b3912015-12-18 01:01:21 -0500948 if (ssl->state == SSL3_ST_SW_KEY_EXCH_C) {
David Benjamin75836432016-06-17 18:48:29 -0400949 return ssl->method->write_message(ssl);
David Benjamin1f9f9c42015-08-28 16:17:59 -0400950 }
951
David Benjamin2a0b3912015-12-18 01:01:21 -0500952 CBB cbb, child;
David Benjaminc42acee2016-06-17 17:47:58 -0400953 CBB_zero(&cbb);
nagendra modadugu601448a2015-07-24 09:31:31 -0700954
David Benjaminc42acee2016-06-17 17:47:58 -0400955 /* Put together the parameters. */
David Benjamin2a0b3912015-12-18 01:01:21 -0500956 if (ssl->state == SSL3_ST_SW_KEY_EXCH_A) {
David Benjamin2a0b3912015-12-18 01:01:21 -0500957 uint32_t alg_k = ssl->s3->tmp.new_cipher->algorithm_mkey;
958 uint32_t alg_a = ssl->s3->tmp.new_cipher->algorithm_auth;
Adam Langley95c29f32014-06-20 12:00:00 -0700959
David Benjaminc42acee2016-06-17 17:47:58 -0400960 /* Pre-allocate enough room to comfortably fit an ECDHE public key. */
961 if (!CBB_init(&cbb, 128)) {
962 goto err;
963 }
964
David Benjamin2a0b3912015-12-18 01:01:21 -0500965 /* PSK ciphers begin with an identity hint. */
Adam Langleyfcf25832014-12-18 17:42:32 -0800966 if (alg_a & SSL_aPSK) {
David Benjamin2a0b3912015-12-18 01:01:21 -0500967 size_t len =
968 (ssl->psk_identity_hint == NULL) ? 0 : strlen(ssl->psk_identity_hint);
969 if (!CBB_add_u16_length_prefixed(&cbb, &child) ||
970 !CBB_add_bytes(&child, (const uint8_t *)ssl->psk_identity_hint,
971 len)) {
972 goto err;
Adam Langleyfcf25832014-12-18 17:42:32 -0800973 }
Adam Langleyfcf25832014-12-18 17:42:32 -0800974 }
Adam Langley95c29f32014-06-20 12:00:00 -0700975
David Benjamin7061e282015-03-19 11:10:48 -0400976 if (alg_k & SSL_kDHE) {
David Benjamin2a0b3912015-12-18 01:01:21 -0500977 /* Determine the group to use. */
978 DH *params = ssl->cert->dh_tmp;
979 if (params == NULL && ssl->cert->dh_tmp_cb != NULL) {
980 params = ssl->cert->dh_tmp_cb(ssl, 0, 1024);
Adam Langleyfcf25832014-12-18 17:42:32 -0800981 }
David Benjamin2a0b3912015-12-18 01:01:21 -0500982 if (params == NULL) {
David Benjamin3570d732015-06-29 00:28:17 -0400983 OPENSSL_PUT_ERROR(SSL, SSL_R_MISSING_TMP_DH_KEY);
David Benjamin2a0b3912015-12-18 01:01:21 -0500984 ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
Adam Langleyfcf25832014-12-18 17:42:32 -0800985 goto err;
986 }
Steven Valdez87eab492016-06-27 16:34:59 -0400987 ssl->s3->new_session->key_exchange_info = DH_num_bits(params);
David Benjamin2a0b3912015-12-18 01:01:21 -0500988
David Benjamin974c7ba2015-12-19 16:58:04 -0500989 /* Set up DH, generate a key, and emit the public half. */
David Benjamin2a0b3912015-12-18 01:01:21 -0500990 DH *dh = DHparams_dup(params);
David Benjamin974c7ba2015-12-19 16:58:04 -0500991 if (dh == NULL) {
Adam Langleyfcf25832014-12-18 17:42:32 -0800992 goto err;
993 }
David Benjamin9f226a52015-04-26 22:12:32 -0400994
David Benjamin974c7ba2015-12-19 16:58:04 -0500995 SSL_ECDH_CTX_init_for_dhe(&ssl->s3->tmp.ecdh_ctx, dh);
David Benjamin2a0b3912015-12-18 01:01:21 -0500996 if (!CBB_add_u16_length_prefixed(&cbb, &child) ||
David Benjamin974c7ba2015-12-19 16:58:04 -0500997 !BN_bn2cbb_padded(&child, BN_num_bytes(params->p), params->p) ||
David Benjamin2a0b3912015-12-18 01:01:21 -0500998 !CBB_add_u16_length_prefixed(&cbb, &child) ||
David Benjamin974c7ba2015-12-19 16:58:04 -0500999 !BN_bn2cbb_padded(&child, BN_num_bytes(params->g), params->g) ||
Matt Braithwaite053931e2016-05-25 12:06:05 -07001000 !CBB_add_u16_length_prefixed(&cbb, &child) ||
Matt Braithwaitef4ce8e52016-05-16 14:27:14 -07001001 !SSL_ECDH_CTX_offer(&ssl->s3->tmp.ecdh_ctx, &child)) {
David Benjamin9f226a52015-04-26 22:12:32 -04001002 goto err;
Adam Langleyfcf25832014-12-18 17:42:32 -08001003 }
David Benjamin7061e282015-03-19 11:10:48 -04001004 } else if (alg_k & SSL_kECDHE) {
Steven Valdezce902a92016-05-17 11:47:53 -04001005 /* Determine the group to use. */
1006 uint16_t group_id;
1007 if (!tls1_get_shared_group(ssl, &group_id)) {
David Benjamin3570d732015-06-29 00:28:17 -04001008 OPENSSL_PUT_ERROR(SSL, SSL_R_MISSING_TMP_ECDH_KEY);
David Benjamin2a0b3912015-12-18 01:01:21 -05001009 ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
Adam Langleyfcf25832014-12-18 17:42:32 -08001010 goto err;
1011 }
Steven Valdez87eab492016-06-27 16:34:59 -04001012 ssl->s3->new_session->key_exchange_info = group_id;
Adam Langley95c29f32014-06-20 12:00:00 -07001013
David Benjamin4298d772015-12-19 00:18:25 -05001014 /* Set up ECDH, generate a key, and emit the public half. */
Steven Valdezce902a92016-05-17 11:47:53 -04001015 if (!SSL_ECDH_CTX_init(&ssl->s3->tmp.ecdh_ctx, group_id) ||
David Benjamin2a0b3912015-12-18 01:01:21 -05001016 !CBB_add_u8(&cbb, NAMED_CURVE_TYPE) ||
Steven Valdezce902a92016-05-17 11:47:53 -04001017 !CBB_add_u16(&cbb, group_id) ||
Matt Braithwaite053931e2016-05-25 12:06:05 -07001018 !CBB_add_u8_length_prefixed(&cbb, &child) ||
1019 !SSL_ECDH_CTX_offer(&ssl->s3->tmp.ecdh_ctx, &child)) {
1020 goto err;
1021 }
1022 } else if (alg_k & SSL_kCECPQ1) {
David Benjamin18a35182016-06-30 13:46:24 -04001023 SSL_ECDH_CTX_init_for_cecpq1(&ssl->s3->tmp.ecdh_ctx);
1024 if (!CBB_add_u16_length_prefixed(&cbb, &child) ||
Matt Braithwaitef4ce8e52016-05-16 14:27:14 -07001025 !SSL_ECDH_CTX_offer(&ssl->s3->tmp.ecdh_ctx, &child)) {
Adam Langleyfcf25832014-12-18 17:42:32 -08001026 goto err;
1027 }
David Benjamin2a0b3912015-12-18 01:01:21 -05001028 } else {
1029 assert(alg_k & SSL_kPSK);
Adam Langleyfcf25832014-12-18 17:42:32 -08001030 }
Adam Langley95c29f32014-06-20 12:00:00 -07001031
David Benjaminc42acee2016-06-17 17:47:58 -04001032 size_t len;
1033 if (!CBB_finish(&cbb, &ssl->s3->tmp.server_params, &len) ||
1034 len > 0xffffffffu) {
1035 OPENSSL_free(ssl->s3->tmp.server_params);
1036 ssl->s3->tmp.server_params = NULL;
1037 goto err;
1038 }
1039 ssl->s3->tmp.server_params_len = (uint32_t)len;
1040 }
1041
1042 /* Assemble the message. */
David Benjamin75836432016-06-17 18:48:29 -04001043 CBB body;
1044 if (!ssl->method->init_message(ssl, &cbb, &body,
1045 SSL3_MT_SERVER_KEY_EXCHANGE) ||
1046 !CBB_add_bytes(&body, ssl->s3->tmp.server_params,
David Benjaminc42acee2016-06-17 17:47:58 -04001047 ssl->s3->tmp.server_params_len)) {
David Benjamin2a0b3912015-12-18 01:01:21 -05001048 goto err;
1049 }
Adam Langley95c29f32014-06-20 12:00:00 -07001050
David Benjamin2a0b3912015-12-18 01:01:21 -05001051 /* Add a signature. */
David Benjaminc032dfa2016-05-12 14:54:57 -04001052 if (ssl_cipher_uses_certificate_auth(ssl->s3->tmp.new_cipher)) {
David Benjamin2a0b3912015-12-18 01:01:21 -05001053 if (!ssl_has_private_key(ssl)) {
1054 ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
Adam Langleyfcf25832014-12-18 17:42:32 -08001055 goto err;
1056 }
Adam Langley95c29f32014-06-20 12:00:00 -07001057
David Benjaminc42acee2016-06-17 17:47:58 -04001058 /* Determine the signature algorithm. */
David Benjaminea9a0d52016-07-08 15:52:59 -07001059 uint16_t signature_algorithm;
1060 if (!tls1_choose_signature_algorithm(ssl, &signature_algorithm)) {
1061 goto err;
1062 }
David Benjaminc42acee2016-06-17 17:47:58 -04001063 if (ssl3_protocol_version(ssl) >= TLS1_2_VERSION) {
Steven Valdezf0451ca2016-06-29 13:16:27 -04001064 if (!CBB_add_u16(&body, signature_algorithm)) {
David Benjaminc42acee2016-06-17 17:47:58 -04001065 OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR);
1066 ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
1067 goto err;
1068 }
David Benjaminc42acee2016-06-17 17:47:58 -04001069 }
1070
1071 /* Add space for the signature. */
David Benjamin2a0b3912015-12-18 01:01:21 -05001072 const size_t max_sig_len = ssl_private_key_max_signature_len(ssl);
David Benjaminc42acee2016-06-17 17:47:58 -04001073 uint8_t *ptr;
David Benjamin75836432016-06-17 18:48:29 -04001074 if (!CBB_add_u16_length_prefixed(&body, &child) ||
David Benjaminc42acee2016-06-17 17:47:58 -04001075 !CBB_reserve(&child, &ptr, max_sig_len)) {
1076 goto err;
1077 }
1078
David Benjamin2a0b3912015-12-18 01:01:21 -05001079 size_t sig_len;
1080 enum ssl_private_key_result_t sign_result;
1081 if (ssl->state == SSL3_ST_SW_KEY_EXCH_A) {
Steven Valdez2b8415e2016-06-30 13:27:23 -04001082 CBB transcript;
1083 uint8_t *transcript_data;
1084 size_t transcript_len;
1085 if (!CBB_init(&transcript,
1086 2*SSL3_RANDOM_SIZE + ssl->s3->tmp.server_params_len) ||
1087 !CBB_add_bytes(&transcript, ssl->s3->client_random, SSL3_RANDOM_SIZE) ||
1088 !CBB_add_bytes(&transcript, ssl->s3->server_random, SSL3_RANDOM_SIZE) ||
1089 !CBB_add_bytes(&transcript, ssl->s3->tmp.server_params,
1090 ssl->s3->tmp.server_params_len) ||
1091 !CBB_finish(&transcript, &transcript_data, &transcript_len)) {
1092 CBB_cleanup(&transcript);
1093 OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR);
1094 ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
Steven Valdezf0451ca2016-06-29 13:16:27 -04001095 goto err;
1096 }
1097
Steven Valdezf0451ca2016-06-29 13:16:27 -04001098 sign_result = ssl_private_key_sign(ssl, ptr, &sig_len, max_sig_len,
Steven Valdez2b8415e2016-06-30 13:27:23 -04001099 signature_algorithm, transcript_data,
1100 transcript_len);
1101 OPENSSL_free(transcript_data);
David Benjamin1f9f9c42015-08-28 16:17:59 -04001102 } else {
David Benjamin2a0b3912015-12-18 01:01:21 -05001103 assert(ssl->state == SSL3_ST_SW_KEY_EXCH_B);
David Benjamind3440b42016-07-14 14:52:41 -04001104 sign_result = ssl_private_key_complete(ssl, ptr, &sig_len, max_sig_len);
Adam Langleyfcf25832014-12-18 17:42:32 -08001105 }
David Benjamin2a0b3912015-12-18 01:01:21 -05001106
1107 switch (sign_result) {
1108 case ssl_private_key_success:
David Benjamin2a0b3912015-12-18 01:01:21 -05001109 if (!CBB_did_write(&child, sig_len)) {
1110 goto err;
1111 }
1112 break;
1113 case ssl_private_key_failure:
David Benjamin2a0b3912015-12-18 01:01:21 -05001114 goto err;
1115 case ssl_private_key_retry:
David Benjamin2a0b3912015-12-18 01:01:21 -05001116 ssl->rwstate = SSL_PRIVATE_KEY_OPERATION;
1117 ssl->state = SSL3_ST_SW_KEY_EXCH_B;
1118 goto err;
1119 }
David Benjamin1f9f9c42015-08-28 16:17:59 -04001120 }
1121
David Benjamin75836432016-06-17 18:48:29 -04001122 if (!ssl->method->finish_message(ssl, &cbb)) {
David Benjamin1f9f9c42015-08-28 16:17:59 -04001123 goto err;
1124 }
David Benjaminc42acee2016-06-17 17:47:58 -04001125
1126 OPENSSL_free(ssl->s3->tmp.server_params);
1127 ssl->s3->tmp.server_params = NULL;
1128 ssl->s3->tmp.server_params_len = 0;
1129
David Benjamin2a0b3912015-12-18 01:01:21 -05001130 ssl->state = SSL3_ST_SW_KEY_EXCH_C;
David Benjamin75836432016-06-17 18:48:29 -04001131 return ssl->method->write_message(ssl);
nagendra modadugu601448a2015-07-24 09:31:31 -07001132
Adam Langley95c29f32014-06-20 12:00:00 -07001133err:
David Benjamin2a0b3912015-12-18 01:01:21 -05001134 CBB_cleanup(&cbb);
Adam Langleyfcf25832014-12-18 17:42:32 -08001135 return -1;
1136}
Adam Langley95c29f32014-06-20 12:00:00 -07001137
David Benjamin75836432016-06-17 18:48:29 -04001138static int add_cert_types(SSL *ssl, CBB *cbb) {
1139 /* Get configured signature algorithms. */
1140 int have_rsa_sign = 0;
1141 int have_ecdsa_sign = 0;
Steven Valdez02563852016-06-23 13:33:05 -04001142 const uint16_t *sig_algs;
1143 size_t sig_algs_len = tls12_get_psigalgs(ssl, &sig_algs);
Adam Langleyfcf25832014-12-18 17:42:32 -08001144 size_t i;
Steven Valdez02563852016-06-23 13:33:05 -04001145 for (i = 0; i < sig_algs_len; i++) {
1146 switch (sig_algs[i]) {
1147 case SSL_SIGN_RSA_PKCS1_SHA512:
1148 case SSL_SIGN_RSA_PKCS1_SHA384:
1149 case SSL_SIGN_RSA_PKCS1_SHA256:
1150 case SSL_SIGN_RSA_PKCS1_SHA1:
David Benjamin75836432016-06-17 18:48:29 -04001151 have_rsa_sign = 1;
1152 break;
Adam Langley95c29f32014-06-20 12:00:00 -07001153
Steven Valdez02563852016-06-23 13:33:05 -04001154 case SSL_SIGN_ECDSA_SECP521R1_SHA512:
1155 case SSL_SIGN_ECDSA_SECP384R1_SHA384:
1156 case SSL_SIGN_ECDSA_SECP256R1_SHA256:
1157 case SSL_SIGN_ECDSA_SHA1:
David Benjamin75836432016-06-17 18:48:29 -04001158 have_ecdsa_sign = 1;
1159 break;
Adam Langleyfcf25832014-12-18 17:42:32 -08001160 }
Adam Langleyfcf25832014-12-18 17:42:32 -08001161 }
Adam Langley95c29f32014-06-20 12:00:00 -07001162
David Benjamin75836432016-06-17 18:48:29 -04001163 if (have_rsa_sign && !CBB_add_u8(cbb, SSL3_CT_RSA_SIGN)) {
1164 return 0;
1165 }
1166
1167 /* ECDSA certs can be used with RSA cipher suites as well so we don't need to
1168 * check for SSL_kECDH or SSL_kECDHE. */
1169 if (ssl->version >= TLS1_VERSION && have_ecdsa_sign &&
1170 !CBB_add_u8(cbb, TLS_CT_ECDSA_SIGN)) {
1171 return 0;
1172 }
1173
1174 return 1;
1175}
1176
1177static int ssl3_send_certificate_request(SSL *ssl) {
1178 if (ssl->state == SSL3_ST_SW_CERT_REQ_B) {
1179 return ssl->method->write_message(ssl);
1180 }
1181
David Benjamin32a66d52016-07-13 22:03:11 -04001182 CBB cbb, body, cert_types, sigalgs_cbb;
David Benjamin75836432016-06-17 18:48:29 -04001183 if (!ssl->method->init_message(ssl, &cbb, &body,
1184 SSL3_MT_CERTIFICATE_REQUEST) ||
1185 !CBB_add_u8_length_prefixed(&body, &cert_types) ||
1186 !add_cert_types(ssl, &cert_types)) {
1187 goto err;
1188 }
1189
1190 if (ssl3_protocol_version(ssl) >= TLS1_2_VERSION) {
Steven Valdez02563852016-06-23 13:33:05 -04001191 const uint16_t *sigalgs;
David Benjamin75836432016-06-17 18:48:29 -04001192 size_t sigalgs_len = tls12_get_psigalgs(ssl, &sigalgs);
Steven Valdez02563852016-06-23 13:33:05 -04001193 if (!CBB_add_u16_length_prefixed(&body, &sigalgs_cbb)) {
David Benjamin75836432016-06-17 18:48:29 -04001194 goto err;
1195 }
Steven Valdez02563852016-06-23 13:33:05 -04001196
1197 size_t i;
1198 for (i = 0; i < sigalgs_len; i++) {
1199 if (!CBB_add_u16(&sigalgs_cbb, sigalgs[i])) {
1200 goto err;
1201 }
1202 }
David Benjamin75836432016-06-17 18:48:29 -04001203 }
1204
David Benjamin32a66d52016-07-13 22:03:11 -04001205 if (!ssl_add_client_CA_list(ssl, &body) ||
1206 !ssl->method->finish_message(ssl, &cbb)) {
David Benjamin75836432016-06-17 18:48:29 -04001207 goto err;
1208 }
1209
1210 ssl->state = SSL3_ST_SW_CERT_REQ_B;
1211 return ssl->method->write_message(ssl);
Adam Langleyfcf25832014-12-18 17:42:32 -08001212
Adam Langley95c29f32014-06-20 12:00:00 -07001213err:
David Benjamin75836432016-06-17 18:48:29 -04001214 OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR);
1215 CBB_cleanup(&cbb);
Adam Langleyfcf25832014-12-18 17:42:32 -08001216 return -1;
1217}
Adam Langley95c29f32014-06-20 12:00:00 -07001218
David Benjamin3dcec452016-06-07 17:13:28 -04001219static int ssl3_send_server_hello_done(SSL *ssl) {
David Benjamin75836432016-06-17 18:48:29 -04001220 if (ssl->state == SSL3_ST_SW_SRVR_DONE_B) {
1221 return ssl->method->write_message(ssl);
David Benjamin9f1dc822016-06-07 17:03:46 -04001222 }
1223
David Benjamin75836432016-06-17 18:48:29 -04001224 CBB cbb, body;
1225 if (!ssl->method->init_message(ssl, &cbb, &body, SSL3_MT_SERVER_HELLO_DONE) ||
1226 !ssl->method->finish_message(ssl, &cbb)) {
1227 OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR);
1228 CBB_cleanup(&cbb);
1229 return -1;
1230 }
1231
1232 ssl->state = SSL3_ST_SW_SRVR_DONE_B;
1233 return ssl->method->write_message(ssl);
David Benjamin9f1dc822016-06-07 17:03:46 -04001234}
1235
1236static int ssl3_get_client_certificate(SSL *ssl) {
David Benjamin9f1dc822016-06-07 17:03:46 -04001237 assert(ssl->s3->tmp.cert_request);
David Benjamin9f1dc822016-06-07 17:03:46 -04001238
David Benjamin09eb6552016-07-08 14:32:11 -07001239 int msg_ret = ssl->method->ssl_get_message(ssl, -1, ssl_hash_message);
1240 if (msg_ret <= 0) {
1241 return msg_ret;
David Benjamin9f1dc822016-06-07 17:03:46 -04001242 }
1243
1244 if (ssl->s3->tmp.message_type != SSL3_MT_CERTIFICATE) {
1245 if (ssl->version == SSL3_VERSION &&
1246 ssl->s3->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE) {
1247 /* In SSL 3.0, the Certificate message is omitted to signal no certificate. */
David Benjaminda2630c2016-08-01 19:57:43 -04001248 if (ssl->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT) {
David Benjamin9f1dc822016-06-07 17:03:46 -04001249 OPENSSL_PUT_ERROR(SSL, SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
David Benjamin5c900c82016-07-13 23:03:26 -04001250 ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
1251 return -1;
David Benjamin9f1dc822016-06-07 17:03:46 -04001252 }
1253
1254 ssl->s3->tmp.reuse_message = 1;
1255 return 1;
1256 }
1257
David Benjamin9f1dc822016-06-07 17:03:46 -04001258 OPENSSL_PUT_ERROR(SSL, SSL_R_UNEXPECTED_MESSAGE);
David Benjamin5c900c82016-07-13 23:03:26 -04001259 ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE);
1260 return -1;
David Benjamin9f1dc822016-06-07 17:03:46 -04001261 }
1262
David Benjamin5c900c82016-07-13 23:03:26 -04001263 CBS certificate_msg;
David Benjamin09eb6552016-07-08 14:32:11 -07001264 CBS_init(&certificate_msg, ssl->init_msg, ssl->init_num);
David Benjamin5c900c82016-07-13 23:03:26 -04001265 uint8_t alert;
1266 STACK_OF(X509) *chain = ssl_parse_cert_chain(
Steven Valdez87eab492016-06-27 16:34:59 -04001267 ssl, &alert, ssl->ctx->retain_only_sha256_of_client_certs
1268 ? ssl->s3->new_session->peer_sha256
1269 : NULL,
David Benjamin5c900c82016-07-13 23:03:26 -04001270 &certificate_msg);
1271 if (chain == NULL) {
1272 ssl3_send_alert(ssl, SSL3_AL_FATAL, alert);
David Benjamin9f1dc822016-06-07 17:03:46 -04001273 goto err;
1274 }
1275
David Benjamin5c900c82016-07-13 23:03:26 -04001276 if (CBS_len(&certificate_msg) != 0) {
David Benjamin9f1dc822016-06-07 17:03:46 -04001277 OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR);
David Benjamin5c900c82016-07-13 23:03:26 -04001278 ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
1279 goto err;
David Benjamin9f1dc822016-06-07 17:03:46 -04001280 }
1281
David Benjamin5c900c82016-07-13 23:03:26 -04001282 if (sk_X509_num(chain) == 0) {
David Benjamin9f1dc822016-06-07 17:03:46 -04001283 /* No client certificate so the handshake buffer may be discarded. */
1284 ssl3_free_handshake_buffer(ssl);
1285
David Benjamine455e512016-08-01 20:11:13 -04001286 /* In SSL 3.0, sending no certificate is signaled by omitting the
1287 * Certificate message. */
David Benjamin9f1dc822016-06-07 17:03:46 -04001288 if (ssl->version == SSL3_VERSION) {
David Benjamin9f1dc822016-06-07 17:03:46 -04001289 OPENSSL_PUT_ERROR(SSL, SSL_R_NO_CERTIFICATES_RETURNED);
David Benjamin5c900c82016-07-13 23:03:26 -04001290 ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
1291 goto err;
David Benjamine455e512016-08-01 20:11:13 -04001292 }
1293
1294 if (ssl->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT) {
David Benjamin9f1dc822016-06-07 17:03:46 -04001295 /* Fail for TLS only if we required a certificate */
1296 OPENSSL_PUT_ERROR(SSL, SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
David Benjamin5c900c82016-07-13 23:03:26 -04001297 ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
1298 goto err;
David Benjamin9f1dc822016-06-07 17:03:46 -04001299 }
1300 } else {
David Benjamin5c900c82016-07-13 23:03:26 -04001301 /* The hash would have been filled in. */
1302 if (ssl->ctx->retain_only_sha256_of_client_certs) {
Steven Valdez87eab492016-06-27 16:34:59 -04001303 ssl->s3->new_session->peer_sha256_valid = 1;
David Benjamin5c900c82016-07-13 23:03:26 -04001304 }
1305
David Benjamine455e512016-08-01 20:11:13 -04001306 if (!ssl_verify_cert_chain(ssl, chain)) {
David Benjamin5c900c82016-07-13 23:03:26 -04001307 goto err;
David Benjamin9f1dc822016-06-07 17:03:46 -04001308 }
1309 }
1310
Steven Valdez87eab492016-06-27 16:34:59 -04001311 X509_free(ssl->s3->new_session->peer);
1312 ssl->s3->new_session->peer = sk_X509_shift(chain);
1313 ssl->s3->new_session->verify_result = ssl->verify_result;
David Benjamin9f1dc822016-06-07 17:03:46 -04001314
Steven Valdez87eab492016-06-27 16:34:59 -04001315 sk_X509_pop_free(ssl->s3->new_session->cert_chain, X509_free);
1316 ssl->s3->new_session->cert_chain = chain;
David Benjamin9f1dc822016-06-07 17:03:46 -04001317 /* Inconsistency alert: cert_chain does *not* include the peer's own
1318 * certificate, while we do include it in s3_clnt.c */
1319
David Benjamin5c900c82016-07-13 23:03:26 -04001320 return 1;
David Benjamin9f1dc822016-06-07 17:03:46 -04001321
1322err:
David Benjamin5c900c82016-07-13 23:03:26 -04001323 sk_X509_pop_free(chain, X509_free);
1324 return -1;
David Benjamin9f1dc822016-06-07 17:03:46 -04001325}
1326
David Benjamindf50eec2016-06-07 16:49:42 -04001327static int ssl3_get_client_key_exchange(SSL *ssl) {
nagendra modadugu3398dbf2015-08-07 14:07:52 -07001328 int al;
Adam Langleyfcf25832014-12-18 17:42:32 -08001329 CBS client_key_exchange;
David Benjamin3fa27772015-04-17 22:32:19 -04001330 uint32_t alg_k;
1331 uint32_t alg_a;
Adam Langleyfcf25832014-12-18 17:42:32 -08001332 uint8_t *premaster_secret = NULL;
1333 size_t premaster_secret_len = 0;
Adam Langleyfcf25832014-12-18 17:42:32 -08001334 uint8_t *decrypt_buf = NULL;
Adam Langley95c29f32014-06-20 12:00:00 -07001335
David Benjamin4298d772015-12-19 00:18:25 -05001336 unsigned psk_len = 0;
Adam Langleyfcf25832014-12-18 17:42:32 -08001337 uint8_t psk[PSK_MAX_PSK_LEN];
Adam Langley95c29f32014-06-20 12:00:00 -07001338
David Benjamin1e6d6df2016-05-13 18:28:17 -04001339 if (ssl->state == SSL3_ST_SR_KEY_EXCH_A) {
David Benjamin09eb6552016-07-08 14:32:11 -07001340 int ret = ssl->method->ssl_get_message(ssl, SSL3_MT_CLIENT_KEY_EXCHANGE,
1341 ssl_hash_message);
1342 if (ret <= 0) {
1343 return ret;
nagendra modadugu3398dbf2015-08-07 14:07:52 -07001344 }
Adam Langleyfcf25832014-12-18 17:42:32 -08001345 }
Adam Langley95c29f32014-06-20 12:00:00 -07001346
David Benjamin0d56f882015-12-19 17:05:56 -05001347 CBS_init(&client_key_exchange, ssl->init_msg, ssl->init_num);
1348 alg_k = ssl->s3->tmp.new_cipher->algorithm_mkey;
1349 alg_a = ssl->s3->tmp.new_cipher->algorithm_auth;
Adam Langleyc26c8022014-06-20 12:00:00 -07001350
Adam Langleyfcf25832014-12-18 17:42:32 -08001351 /* If using a PSK key exchange, prepare the pre-shared key. */
1352 if (alg_a & SSL_aPSK) {
1353 CBS psk_identity;
David Benjamin35c02302014-07-13 04:14:59 -04001354
Adam Langleyfcf25832014-12-18 17:42:32 -08001355 /* If using PSK, the ClientKeyExchange contains a psk_identity. If PSK,
1356 * then this is the only field in the message. */
1357 if (!CBS_get_u16_length_prefixed(&client_key_exchange, &psk_identity) ||
1358 ((alg_k & SSL_kPSK) && CBS_len(&client_key_exchange) != 0)) {
David Benjamin3570d732015-06-29 00:28:17 -04001359 OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR);
Adam Langleyfcf25832014-12-18 17:42:32 -08001360 al = SSL_AD_DECODE_ERROR;
1361 goto f_err;
1362 }
Adam Langleyc26c8022014-06-20 12:00:00 -07001363
David Benjamin0d56f882015-12-19 17:05:56 -05001364 if (ssl->psk_server_callback == NULL) {
David Benjamin3570d732015-06-29 00:28:17 -04001365 OPENSSL_PUT_ERROR(SSL, SSL_R_PSK_NO_SERVER_CB);
Adam Langleyfcf25832014-12-18 17:42:32 -08001366 al = SSL_AD_INTERNAL_ERROR;
1367 goto f_err;
1368 }
Adam Langleyc26c8022014-06-20 12:00:00 -07001369
Adam Langleyfcf25832014-12-18 17:42:32 -08001370 if (CBS_len(&psk_identity) > PSK_MAX_IDENTITY_LEN ||
1371 CBS_contains_zero_byte(&psk_identity)) {
David Benjamin3570d732015-06-29 00:28:17 -04001372 OPENSSL_PUT_ERROR(SSL, SSL_R_DATA_LENGTH_TOO_LONG);
Adam Langleyfcf25832014-12-18 17:42:32 -08001373 al = SSL_AD_ILLEGAL_PARAMETER;
1374 goto f_err;
1375 }
David Benjamin35c02302014-07-13 04:14:59 -04001376
Steven Valdez87eab492016-06-27 16:34:59 -04001377 if (!CBS_strdup(&psk_identity, &ssl->s3->new_session->psk_identity)) {
Adam Langleyfcf25832014-12-18 17:42:32 -08001378 al = SSL_AD_INTERNAL_ERROR;
David Benjamin3570d732015-06-29 00:28:17 -04001379 OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE);
Adam Langleyfcf25832014-12-18 17:42:32 -08001380 goto f_err;
1381 }
Adam Langleyc26c8022014-06-20 12:00:00 -07001382
Adam Langleyfcf25832014-12-18 17:42:32 -08001383 /* Look up the key for the identity. */
Steven Valdez87eab492016-06-27 16:34:59 -04001384 psk_len = ssl->psk_server_callback(ssl, ssl->s3->new_session->psk_identity,
1385 psk, sizeof(psk));
Adam Langleyfcf25832014-12-18 17:42:32 -08001386 if (psk_len > PSK_MAX_PSK_LEN) {
David Benjamin3570d732015-06-29 00:28:17 -04001387 OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR);
Adam Langleyfcf25832014-12-18 17:42:32 -08001388 al = SSL_AD_INTERNAL_ERROR;
1389 goto f_err;
1390 } else if (psk_len == 0) {
1391 /* PSK related to the given identity not found */
David Benjamin3570d732015-06-29 00:28:17 -04001392 OPENSSL_PUT_ERROR(SSL, SSL_R_PSK_IDENTITY_NOT_FOUND);
Adam Langleyfcf25832014-12-18 17:42:32 -08001393 al = SSL_AD_UNKNOWN_PSK_IDENTITY;
1394 goto f_err;
1395 }
1396 }
Adam Langleyacff73f2014-06-20 12:00:00 -07001397
Adam Langleyfcf25832014-12-18 17:42:32 -08001398 /* Depending on the key exchange method, compute |premaster_secret| and
1399 * |premaster_secret_len|. */
1400 if (alg_k & SSL_kRSA) {
Adam Langleyfcf25832014-12-18 17:42:32 -08001401 /* Allocate a buffer large enough for an RSA decryption. */
David Benjamin0d56f882015-12-19 17:05:56 -05001402 const size_t rsa_size = ssl_private_key_max_signature_len(ssl);
Adam Langleyfcf25832014-12-18 17:42:32 -08001403 decrypt_buf = OPENSSL_malloc(rsa_size);
1404 if (decrypt_buf == NULL) {
David Benjamin3570d732015-06-29 00:28:17 -04001405 OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE);
Adam Langleyfcf25832014-12-18 17:42:32 -08001406 goto err;
1407 }
David Benjamin35c02302014-07-13 04:14:59 -04001408
nagendra modadugu3398dbf2015-08-07 14:07:52 -07001409 enum ssl_private_key_result_t decrypt_result;
David Benjamin3f5b43d2015-12-01 19:31:24 -05001410 size_t decrypt_len;
David Benjamin1e6d6df2016-05-13 18:28:17 -04001411 if (ssl->state == SSL3_ST_SR_KEY_EXCH_A) {
David Benjamin0d56f882015-12-19 17:05:56 -05001412 if (!ssl_has_private_key(ssl) ||
David Benjamin0c0b7e12016-07-14 13:47:55 -04001413 ssl_private_key_type(ssl) != NID_rsaEncryption) {
nagendra modadugu3398dbf2015-08-07 14:07:52 -07001414 al = SSL_AD_HANDSHAKE_FAILURE;
1415 OPENSSL_PUT_ERROR(SSL, SSL_R_MISSING_RSA_CERTIFICATE);
1416 goto f_err;
1417 }
David Benjamin3f5b43d2015-12-01 19:31:24 -05001418 CBS encrypted_premaster_secret;
David Benjamin0d56f882015-12-19 17:05:56 -05001419 if (ssl->version > SSL3_VERSION) {
nagendra modadugu3398dbf2015-08-07 14:07:52 -07001420 if (!CBS_get_u16_length_prefixed(&client_key_exchange,
1421 &encrypted_premaster_secret) ||
1422 CBS_len(&client_key_exchange) != 0) {
David Benjaminef5e5152015-11-18 20:35:31 -05001423 al = SSL_AD_DECODE_ERROR;
1424 OPENSSL_PUT_ERROR(SSL,
1425 SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
1426 goto f_err;
nagendra modadugu3398dbf2015-08-07 14:07:52 -07001427 }
1428 } else {
1429 encrypted_premaster_secret = client_key_exchange;
1430 }
1431
nagendra modadugu3398dbf2015-08-07 14:07:52 -07001432 /* Decrypt with no padding. PKCS#1 padding will be removed as part of the
1433 * timing-sensitive code below. */
1434 decrypt_result = ssl_private_key_decrypt(
David Benjamin0d56f882015-12-19 17:05:56 -05001435 ssl, decrypt_buf, &decrypt_len, rsa_size,
nagendra modadugu3398dbf2015-08-07 14:07:52 -07001436 CBS_data(&encrypted_premaster_secret),
1437 CBS_len(&encrypted_premaster_secret));
1438 } else {
David Benjamin1e6d6df2016-05-13 18:28:17 -04001439 assert(ssl->state == SSL3_ST_SR_KEY_EXCH_B);
nagendra modadugu3398dbf2015-08-07 14:07:52 -07001440 /* Complete async decrypt. */
David Benjamind3440b42016-07-14 14:52:41 -04001441 decrypt_result =
1442 ssl_private_key_complete(ssl, decrypt_buf, &decrypt_len, rsa_size);
Adam Langleyfcf25832014-12-18 17:42:32 -08001443 }
nagendra modadugu3398dbf2015-08-07 14:07:52 -07001444
1445 switch (decrypt_result) {
1446 case ssl_private_key_success:
nagendra modadugu3398dbf2015-08-07 14:07:52 -07001447 break;
1448 case ssl_private_key_failure:
nagendra modadugu3398dbf2015-08-07 14:07:52 -07001449 goto err;
1450 case ssl_private_key_retry:
David Benjamin0d56f882015-12-19 17:05:56 -05001451 ssl->rwstate = SSL_PRIVATE_KEY_OPERATION;
David Benjamin1e6d6df2016-05-13 18:28:17 -04001452 ssl->state = SSL3_ST_SR_KEY_EXCH_B;
nagendra modadugu3398dbf2015-08-07 14:07:52 -07001453 goto err;
1454 }
1455
Daniel Bathgate4365c3f2016-04-14 17:18:02 -04001456 if (decrypt_len != rsa_size) {
1457 al = SSL_AD_DECRYPT_ERROR;
1458 OPENSSL_PUT_ERROR(SSL, SSL_R_DECRYPTION_FAILED);
1459 goto f_err;
1460 }
Adam Langleyacff73f2014-06-20 12:00:00 -07001461
David Benjamin3f5b43d2015-12-01 19:31:24 -05001462 /* Prepare a random premaster, to be used on invalid padding. See RFC 5246,
1463 * section 7.4.7.1. */
1464 premaster_secret_len = SSL_MAX_MASTER_KEY_LENGTH;
1465 premaster_secret = OPENSSL_malloc(premaster_secret_len);
Adam Langleyfcf25832014-12-18 17:42:32 -08001466 if (premaster_secret == NULL) {
David Benjamin3570d732015-06-29 00:28:17 -04001467 OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE);
Adam Langleyfcf25832014-12-18 17:42:32 -08001468 goto err;
1469 }
David Benjamin3f5b43d2015-12-01 19:31:24 -05001470 if (!RAND_bytes(premaster_secret, premaster_secret_len)) {
nagendra modadugu3398dbf2015-08-07 14:07:52 -07001471 goto err;
1472 }
1473
David Benjamin3f5b43d2015-12-01 19:31:24 -05001474 /* The smallest padded premaster is 11 bytes of overhead. Small keys are
1475 * publicly invalid. */
1476 if (decrypt_len < 11 + premaster_secret_len) {
1477 al = SSL_AD_DECRYPT_ERROR;
1478 OPENSSL_PUT_ERROR(SSL, SSL_R_DECRYPTION_FAILED);
1479 goto f_err;
Adam Langleyfcf25832014-12-18 17:42:32 -08001480 }
David Benjamin35c02302014-07-13 04:14:59 -04001481
David Benjamin3f5b43d2015-12-01 19:31:24 -05001482 /* Check the padding. See RFC 3447, section 7.2.2. */
1483 size_t padding_len = decrypt_len - premaster_secret_len;
1484 uint8_t good = constant_time_eq_int_8(decrypt_buf[0], 0) &
1485 constant_time_eq_int_8(decrypt_buf[1], 2);
1486 size_t i;
1487 for (i = 2; i < padding_len - 1; i++) {
1488 good &= ~constant_time_is_zero_8(decrypt_buf[i]);
1489 }
1490 good &= constant_time_is_zero_8(decrypt_buf[padding_len - 1]);
1491
1492 /* The premaster secret must begin with |client_version|. This too must be
1493 * checked in constant time (http://eprint.iacr.org/2003/052/). */
1494 good &= constant_time_eq_8(decrypt_buf[padding_len],
David Benjamin0d56f882015-12-19 17:05:56 -05001495 (unsigned)(ssl->client_version >> 8));
David Benjamin3f5b43d2015-12-01 19:31:24 -05001496 good &= constant_time_eq_8(decrypt_buf[padding_len + 1],
David Benjamin0d56f882015-12-19 17:05:56 -05001497 (unsigned)(ssl->client_version & 0xff));
David Benjamin3f5b43d2015-12-01 19:31:24 -05001498
1499 /* Select, in constant time, either the decrypted premaster or the random
1500 * premaster based on |good|. */
1501 for (i = 0; i < premaster_secret_len; i++) {
1502 premaster_secret[i] = constant_time_select_8(
1503 good, decrypt_buf[padding_len + i], premaster_secret[i]);
1504 }
1505
1506 OPENSSL_free(decrypt_buf);
1507 decrypt_buf = NULL;
Matt Braithwaite053931e2016-05-25 12:06:05 -07001508 } else if (alg_k & (SSL_kECDHE|SSL_kDHE|SSL_kCECPQ1)) {
Matt Braithwaitee25775b2016-05-16 16:31:05 -07001509 /* Parse the ClientKeyExchange. */
David Benjamin974c7ba2015-12-19 16:58:04 -05001510 CBS peer_key;
Matt Braithwaitee25775b2016-05-16 16:31:05 -07001511 if (!SSL_ECDH_CTX_get_key(&ssl->s3->tmp.ecdh_ctx, &client_key_exchange,
1512 &peer_key) ||
1513 CBS_len(&client_key_exchange) != 0) {
Adam Langleyfcf25832014-12-18 17:42:32 -08001514 al = SSL_AD_DECODE_ERROR;
David Benjamin3570d732015-06-29 00:28:17 -04001515 OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR);
Adam Langleyfcf25832014-12-18 17:42:32 -08001516 goto f_err;
1517 }
David Benjaminbd30f8e2014-08-19 16:02:38 -04001518
David Benjamin4298d772015-12-19 00:18:25 -05001519 /* Compute the premaster. */
1520 uint8_t alert;
Matt Braithwaitef4ce8e52016-05-16 14:27:14 -07001521 if (!SSL_ECDH_CTX_finish(&ssl->s3->tmp.ecdh_ctx, &premaster_secret,
1522 &premaster_secret_len, &alert, CBS_data(&peer_key),
1523 CBS_len(&peer_key))) {
David Benjamin4298d772015-12-19 00:18:25 -05001524 al = alert;
1525 goto f_err;
Adam Langleyfcf25832014-12-18 17:42:32 -08001526 }
Adam Langley95c29f32014-06-20 12:00:00 -07001527
David Benjamin4298d772015-12-19 00:18:25 -05001528 /* The key exchange state may now be discarded. */
David Benjamin0d56f882015-12-19 17:05:56 -05001529 SSL_ECDH_CTX_cleanup(&ssl->s3->tmp.ecdh_ctx);
Adam Langleyfcf25832014-12-18 17:42:32 -08001530 } else if (alg_k & SSL_kPSK) {
1531 /* For plain PSK, other_secret is a block of 0s with the same length as the
1532 * pre-shared key. */
1533 premaster_secret_len = psk_len;
1534 premaster_secret = OPENSSL_malloc(premaster_secret_len);
1535 if (premaster_secret == NULL) {
David Benjamin3570d732015-06-29 00:28:17 -04001536 OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE);
Adam Langleyfcf25832014-12-18 17:42:32 -08001537 goto err;
1538 }
1539 memset(premaster_secret, 0, premaster_secret_len);
1540 } else {
1541 al = SSL_AD_HANDSHAKE_FAILURE;
David Benjamin3570d732015-06-29 00:28:17 -04001542 OPENSSL_PUT_ERROR(SSL, SSL_R_UNKNOWN_CIPHER_TYPE);
Adam Langleyfcf25832014-12-18 17:42:32 -08001543 goto f_err;
1544 }
Adam Langley95c29f32014-06-20 12:00:00 -07001545
Adam Langleyfcf25832014-12-18 17:42:32 -08001546 /* For a PSK cipher suite, the actual pre-master secret is combined with the
1547 * pre-shared key. */
1548 if (alg_a & SSL_aPSK) {
1549 CBB new_premaster, child;
1550 uint8_t *new_data;
1551 size_t new_len;
David Benjamin14c83e72014-07-13 04:54:57 -04001552
David Benjamina8653202015-06-28 01:26:10 -04001553 CBB_zero(&new_premaster);
1554 if (!CBB_init(&new_premaster, 2 + psk_len + 2 + premaster_secret_len) ||
1555 !CBB_add_u16_length_prefixed(&new_premaster, &child) ||
Adam Langleyfcf25832014-12-18 17:42:32 -08001556 !CBB_add_bytes(&child, premaster_secret, premaster_secret_len) ||
1557 !CBB_add_u16_length_prefixed(&new_premaster, &child) ||
1558 !CBB_add_bytes(&child, psk, psk_len) ||
1559 !CBB_finish(&new_premaster, &new_data, &new_len)) {
David Benjamin3570d732015-06-29 00:28:17 -04001560 OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE);
Adam Langleyfcf25832014-12-18 17:42:32 -08001561 CBB_cleanup(&new_premaster);
1562 goto err;
1563 }
David Benjamin14c83e72014-07-13 04:54:57 -04001564
Adam Langleyfcf25832014-12-18 17:42:32 -08001565 OPENSSL_cleanse(premaster_secret, premaster_secret_len);
1566 OPENSSL_free(premaster_secret);
1567 premaster_secret = new_data;
1568 premaster_secret_len = new_len;
1569 }
David Benjamin14c83e72014-07-13 04:54:57 -04001570
Adam Langleyfcf25832014-12-18 17:42:32 -08001571 /* Compute the master secret */
Steven Valdez87eab492016-06-27 16:34:59 -04001572 ssl->s3->new_session->master_key_length = tls1_generate_master_secret(
1573 ssl, ssl->s3->new_session->master_key, premaster_secret,
1574 premaster_secret_len);
1575 if (ssl->s3->new_session->master_key_length == 0) {
Adam Langleyfcf25832014-12-18 17:42:32 -08001576 goto err;
1577 }
Steven Valdez87eab492016-06-27 16:34:59 -04001578 ssl->s3->new_session->extended_master_secret =
1579 ssl->s3->tmp.extended_master_secret;
David Benjamin14c83e72014-07-13 04:54:57 -04001580
Adam Langleyfcf25832014-12-18 17:42:32 -08001581 OPENSSL_cleanse(premaster_secret, premaster_secret_len);
1582 OPENSSL_free(premaster_secret);
1583 return 1;
1584
Adam Langley95c29f32014-06-20 12:00:00 -07001585f_err:
David Benjamin0d56f882015-12-19 17:05:56 -05001586 ssl3_send_alert(ssl, SSL3_AL_FATAL, al);
Adam Langley95c29f32014-06-20 12:00:00 -07001587err:
David Benjamin4298d772015-12-19 00:18:25 -05001588 if (premaster_secret != NULL) {
1589 OPENSSL_cleanse(premaster_secret, premaster_secret_len);
Adam Langleyfcf25832014-12-18 17:42:32 -08001590 OPENSSL_free(premaster_secret);
1591 }
David Benjamin2755a3e2015-04-22 16:17:58 -04001592 OPENSSL_free(decrypt_buf);
Adam Langley95c29f32014-06-20 12:00:00 -07001593
Adam Langleyfcf25832014-12-18 17:42:32 -08001594 return -1;
1595}
Adam Langley95c29f32014-06-20 12:00:00 -07001596
David Benjamindf50eec2016-06-07 16:49:42 -04001597static int ssl3_get_cert_verify(SSL *ssl) {
David Benjamin09eb6552016-07-08 14:32:11 -07001598 int al, ret = 0;
Adam Langleyfcf25832014-12-18 17:42:32 -08001599 CBS certificate_verify, signature;
Steven Valdez87eab492016-06-27 16:34:59 -04001600 X509 *peer = ssl->s3->new_session->peer;
Adam Langleyfcf25832014-12-18 17:42:32 -08001601 EVP_PKEY *pkey = NULL;
David Benjamin6553b372014-07-22 14:11:30 -04001602
Adam Langleyfcf25832014-12-18 17:42:32 -08001603 /* Only RSA and ECDSA client certificates are supported, so a
1604 * CertificateVerify is required if and only if there's a client certificate.
1605 * */
1606 if (peer == NULL) {
David Benjamin0d56f882015-12-19 17:05:56 -05001607 ssl3_free_handshake_buffer(ssl);
Adam Langleyfcf25832014-12-18 17:42:32 -08001608 return 1;
1609 }
Adam Langley95c29f32014-06-20 12:00:00 -07001610
David Benjamin09eb6552016-07-08 14:32:11 -07001611 int msg_ret = ssl->method->ssl_get_message(ssl, SSL3_MT_CERTIFICATE_VERIFY,
1612 ssl_dont_hash_message);
1613 if (msg_ret <= 0) {
1614 return msg_ret;
Adam Langleyfcf25832014-12-18 17:42:32 -08001615 }
David Benjaminef865502014-08-24 02:48:34 -04001616
Adam Langleyfcf25832014-12-18 17:42:32 -08001617 /* Filter out unsupported certificate types. */
1618 pkey = X509_get_pubkey(peer);
David Benjamin9d0847a2015-02-16 03:57:55 -05001619 if (pkey == NULL) {
1620 goto err;
1621 }
David Benjamin6897dbe2014-07-12 20:18:28 -04001622
David Benjamin09eb6552016-07-08 14:32:11 -07001623 CBS_init(&certificate_verify, ssl->init_msg, ssl->init_num);
David Benjamin6897dbe2014-07-12 20:18:28 -04001624
Adam Langleyfcf25832014-12-18 17:42:32 -08001625 /* Determine the digest type if needbe. */
Steven Valdezf0451ca2016-06-29 13:16:27 -04001626 uint16_t signature_algorithm = 0;
David Benjamina1e9cab2015-12-30 00:08:49 -05001627 if (ssl3_protocol_version(ssl) >= TLS1_2_VERSION) {
Steven Valdez02563852016-06-23 13:33:05 -04001628 if (!CBS_get_u16(&certificate_verify, &signature_algorithm)) {
David Benjamin6e807652015-11-02 12:02:20 -05001629 al = SSL_AD_DECODE_ERROR;
1630 OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR);
1631 goto f_err;
1632 }
David Benjamin887c3002016-07-08 16:15:32 -07001633 if (!tls12_check_peer_sigalg(ssl, &al, signature_algorithm)) {
David Benjamin6e807652015-11-02 12:02:20 -05001634 goto f_err;
1635 }
Steven Valdez02563852016-06-23 13:33:05 -04001636 ssl->s3->tmp.peer_signature_algorithm = signature_algorithm;
Steven Valdezf0451ca2016-06-29 13:16:27 -04001637 } else if (pkey->type == EVP_PKEY_RSA) {
1638 signature_algorithm = SSL_SIGN_RSA_PKCS1_MD5_SHA1;
1639 } else if (pkey->type == EVP_PKEY_EC) {
1640 signature_algorithm = SSL_SIGN_ECDSA_SHA1;
David Benjamin49ec9bb2016-07-14 00:11:26 -04001641 } else {
1642 al = SSL_AD_UNSUPPORTED_CERTIFICATE;
1643 OPENSSL_PUT_ERROR(SSL, SSL_R_PEER_ERROR_UNSUPPORTED_CERTIFICATE_TYPE);
1644 goto f_err;
Adam Langleyfcf25832014-12-18 17:42:32 -08001645 }
David Benjamin854dd652014-08-26 00:32:30 -04001646
Adam Langleyfcf25832014-12-18 17:42:32 -08001647 /* Parse and verify the signature. */
1648 if (!CBS_get_u16_length_prefixed(&certificate_verify, &signature) ||
1649 CBS_len(&certificate_verify) != 0) {
1650 al = SSL_AD_DECODE_ERROR;
David Benjamin3570d732015-06-29 00:28:17 -04001651 OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR);
Adam Langleyfcf25832014-12-18 17:42:32 -08001652 goto f_err;
1653 }
Adam Langley95c29f32014-06-20 12:00:00 -07001654
Steven Valdez2b8415e2016-06-30 13:27:23 -04001655 int sig_ok;
1656 /* The SSL3 construction for CertificateVerify does not decompose into a
1657 * single final digest and signature, and must be special-cased. */
1658 if (ssl3_protocol_version(ssl) == SSL3_VERSION) {
David Benjamin0aa25bd2016-07-08 14:44:56 -07001659 const EVP_MD *md;
Steven Valdez2b8415e2016-06-30 13:27:23 -04001660 uint8_t digest[EVP_MAX_MD_SIZE];
1661 size_t digest_len;
David Benjamin0aa25bd2016-07-08 14:44:56 -07001662 if (!ssl3_cert_verify_hash(ssl, &md, digest, &digest_len,
Steven Valdez2b8415e2016-06-30 13:27:23 -04001663 signature_algorithm)) {
1664 goto err;
1665 }
1666
Steven Valdez2b8415e2016-06-30 13:27:23 -04001667 EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new(pkey, NULL);
1668 sig_ok = pctx != NULL &&
1669 EVP_PKEY_verify_init(pctx) &&
1670 EVP_PKEY_CTX_set_signature_md(pctx, md) &&
1671 EVP_PKEY_verify(pctx, CBS_data(&signature), CBS_len(&signature),
1672 digest, digest_len);
Steven Valdez2b8415e2016-06-30 13:27:23 -04001673 EVP_PKEY_CTX_free(pctx);
1674 } else {
1675 sig_ok = ssl_public_key_verify(
1676 ssl, CBS_data(&signature), CBS_len(&signature), signature_algorithm,
1677 pkey, (const uint8_t *)ssl->s3->handshake_buffer->data,
1678 ssl->s3->handshake_buffer->length);
Adam Langleyfcf25832014-12-18 17:42:32 -08001679 }
Steven Valdezf0451ca2016-06-29 13:16:27 -04001680
David Benjaminbf82aed2016-03-01 22:57:40 -05001681#if defined(BORINGSSL_UNSAFE_FUZZER_MODE)
1682 sig_ok = 1;
1683 ERR_clear_error();
1684#endif
1685 if (!sig_ok) {
Adam Langleyfcf25832014-12-18 17:42:32 -08001686 al = SSL_AD_DECRYPT_ERROR;
David Benjamin3570d732015-06-29 00:28:17 -04001687 OPENSSL_PUT_ERROR(SSL, SSL_R_BAD_SIGNATURE);
Adam Langleyfcf25832014-12-18 17:42:32 -08001688 goto f_err;
1689 }
1690
Steven Valdez2b8415e2016-06-30 13:27:23 -04001691 /* The handshake buffer is no longer necessary, and we may hash the current
1692 * message.*/
1693 ssl3_free_handshake_buffer(ssl);
David Benjamin528bd262016-07-08 09:34:05 -07001694 if (!ssl->method->hash_current_message(ssl)) {
Steven Valdez2b8415e2016-06-30 13:27:23 -04001695 goto err;
1696 }
1697
Adam Langleyfcf25832014-12-18 17:42:32 -08001698 ret = 1;
1699
1700 if (0) {
1701 f_err:
David Benjamin0d56f882015-12-19 17:05:56 -05001702 ssl3_send_alert(ssl, SSL3_AL_FATAL, al);
Adam Langleyfcf25832014-12-18 17:42:32 -08001703 }
1704
David Benjamin854dd652014-08-26 00:32:30 -04001705err:
Adam Langleyfcf25832014-12-18 17:42:32 -08001706 EVP_PKEY_free(pkey);
Adam Langley95c29f32014-06-20 12:00:00 -07001707
Adam Langleyfcf25832014-12-18 17:42:32 -08001708 return ret;
1709}
Adam Langley95c29f32014-06-20 12:00:00 -07001710
Adam Langley95c29f32014-06-20 12:00:00 -07001711/* ssl3_get_next_proto reads a Next Protocol Negotiation handshake message. It
1712 * sets the next_proto member in s if found */
David Benjamindf50eec2016-06-07 16:49:42 -04001713static int ssl3_get_next_proto(SSL *ssl) {
David Benjamin09eb6552016-07-08 14:32:11 -07001714 int ret =
1715 ssl->method->ssl_get_message(ssl, SSL3_MT_NEXT_PROTO, ssl_hash_message);
1716 if (ret <= 0) {
1717 return ret;
Adam Langleyfcf25832014-12-18 17:42:32 -08001718 }
Adam Langley95c29f32014-06-20 12:00:00 -07001719
David Benjamin09eb6552016-07-08 14:32:11 -07001720 CBS next_protocol, selected_protocol, padding;
1721 CBS_init(&next_protocol, ssl->init_msg, ssl->init_num);
Adam Langleyfcf25832014-12-18 17:42:32 -08001722 if (!CBS_get_u8_length_prefixed(&next_protocol, &selected_protocol) ||
1723 !CBS_get_u8_length_prefixed(&next_protocol, &padding) ||
1724 CBS_len(&next_protocol) != 0 ||
David Benjamin79978df2015-12-25 15:56:49 -05001725 !CBS_stow(&selected_protocol, &ssl->s3->next_proto_negotiated,
1726 &ssl->s3->next_proto_negotiated_len)) {
Adam Langleyfcf25832014-12-18 17:42:32 -08001727 return 0;
1728 }
Adam Langley95c29f32014-06-20 12:00:00 -07001729
Adam Langleyfcf25832014-12-18 17:42:32 -08001730 return 1;
1731}
Adam Langley95c29f32014-06-20 12:00:00 -07001732
Adam Langley1258b6a2014-06-20 12:00:00 -07001733/* ssl3_get_channel_id reads and verifies a ClientID handshake message. */
David Benjamindf50eec2016-06-07 16:49:42 -04001734static int ssl3_get_channel_id(SSL *ssl) {
David Benjamin09eb6552016-07-08 14:32:11 -07001735 int ret = -1;
David Benjamind6a4ae92015-08-06 11:10:51 -04001736 uint8_t channel_id_hash[EVP_MAX_MD_SIZE];
1737 size_t channel_id_hash_len;
Adam Langleyfcf25832014-12-18 17:42:32 -08001738 const uint8_t *p;
Adam Langley49c7af12015-07-10 14:33:46 -07001739 uint16_t extension_type;
Adam Langleyfcf25832014-12-18 17:42:32 -08001740 EC_GROUP *p256 = NULL;
1741 EC_KEY *key = NULL;
1742 EC_POINT *point = NULL;
1743 ECDSA_SIG sig;
1744 BIGNUM x, y;
1745 CBS encrypted_extensions, extension;
Adam Langley1258b6a2014-06-20 12:00:00 -07001746
David Benjamin09eb6552016-07-08 14:32:11 -07001747 int msg_ret = ssl->method->ssl_get_message(ssl, SSL3_MT_CHANNEL_ID,
1748 ssl_dont_hash_message);
1749 if (msg_ret <= 0) {
1750 return msg_ret;
Adam Langleyfcf25832014-12-18 17:42:32 -08001751 }
Adam Langley1258b6a2014-06-20 12:00:00 -07001752
Adam Langleyfcf25832014-12-18 17:42:32 -08001753 /* Before incorporating the EncryptedExtensions message to the handshake
1754 * hash, compute the hash that should have been signed. */
David Benjamin0d56f882015-12-19 17:05:56 -05001755 if (!tls1_channel_id_hash(ssl, channel_id_hash, &channel_id_hash_len)) {
Adam Langleyfcf25832014-12-18 17:42:32 -08001756 return -1;
1757 }
Adam Langleyfcf25832014-12-18 17:42:32 -08001758 assert(channel_id_hash_len == SHA256_DIGEST_LENGTH);
David Benjamin880b14e2014-08-25 22:35:07 -04001759
David Benjamin528bd262016-07-08 09:34:05 -07001760 if (!ssl->method->hash_current_message(ssl)) {
David Benjaminfbdfefb2015-02-16 19:33:53 -05001761 return -1;
1762 }
Adam Langley1258b6a2014-06-20 12:00:00 -07001763
David Benjamin09eb6552016-07-08 14:32:11 -07001764 CBS_init(&encrypted_extensions, ssl->init_msg, ssl->init_num);
Adam Langley1258b6a2014-06-20 12:00:00 -07001765
Adam Langleyfcf25832014-12-18 17:42:32 -08001766 /* EncryptedExtensions could include multiple extensions, but the only
David Benjamin8e710ca2016-06-13 14:09:37 -04001767 * extension that could be negotiated is Channel ID, so there can only be one
1768 * entry. */
Adam Langleyfcf25832014-12-18 17:42:32 -08001769 if (!CBS_get_u16(&encrypted_extensions, &extension_type) ||
1770 !CBS_get_u16_length_prefixed(&encrypted_extensions, &extension) ||
1771 CBS_len(&encrypted_extensions) != 0 ||
Adam Langley49c7af12015-07-10 14:33:46 -07001772 extension_type != TLSEXT_TYPE_channel_id ||
Adam Langleyfcf25832014-12-18 17:42:32 -08001773 CBS_len(&extension) != TLSEXT_CHANNEL_ID_SIZE) {
David Benjamin3570d732015-06-29 00:28:17 -04001774 OPENSSL_PUT_ERROR(SSL, SSL_R_INVALID_MESSAGE);
Adam Langleyfcf25832014-12-18 17:42:32 -08001775 return -1;
1776 }
Adam Langley1258b6a2014-06-20 12:00:00 -07001777
Adam Langleyfcf25832014-12-18 17:42:32 -08001778 p256 = EC_GROUP_new_by_curve_name(NID_X9_62_prime256v1);
1779 if (!p256) {
David Benjamin3570d732015-06-29 00:28:17 -04001780 OPENSSL_PUT_ERROR(SSL, SSL_R_NO_P256_SUPPORT);
Adam Langleyfcf25832014-12-18 17:42:32 -08001781 return -1;
1782 }
Adam Langley1258b6a2014-06-20 12:00:00 -07001783
Adam Langleyfcf25832014-12-18 17:42:32 -08001784 BN_init(&x);
1785 BN_init(&y);
1786 sig.r = BN_new();
1787 sig.s = BN_new();
David Benjamin9d0847a2015-02-16 03:57:55 -05001788 if (sig.r == NULL || sig.s == NULL) {
1789 goto err;
1790 }
Adam Langley1258b6a2014-06-20 12:00:00 -07001791
Adam Langleyfcf25832014-12-18 17:42:32 -08001792 p = CBS_data(&extension);
1793 if (BN_bin2bn(p + 0, 32, &x) == NULL ||
1794 BN_bin2bn(p + 32, 32, &y) == NULL ||
1795 BN_bin2bn(p + 64, 32, sig.r) == NULL ||
1796 BN_bin2bn(p + 96, 32, sig.s) == NULL) {
1797 goto err;
1798 }
Adam Langley1258b6a2014-06-20 12:00:00 -07001799
Adam Langleyfcf25832014-12-18 17:42:32 -08001800 point = EC_POINT_new(p256);
David Benjamin0d56f882015-12-19 17:05:56 -05001801 if (!point ||
1802 !EC_POINT_set_affine_coordinates_GFp(p256, point, &x, &y, NULL)) {
Adam Langleyfcf25832014-12-18 17:42:32 -08001803 goto err;
1804 }
Adam Langley1258b6a2014-06-20 12:00:00 -07001805
Adam Langleyfcf25832014-12-18 17:42:32 -08001806 key = EC_KEY_new();
1807 if (!key || !EC_KEY_set_group(key, p256) ||
1808 !EC_KEY_set_public_key(key, point)) {
1809 goto err;
1810 }
Adam Langley1258b6a2014-06-20 12:00:00 -07001811
Adam Langleyfcf25832014-12-18 17:42:32 -08001812 /* We stored the handshake hash in |tlsext_channel_id| the first time that we
1813 * were called. */
1814 if (!ECDSA_do_verify(channel_id_hash, channel_id_hash_len, &sig, key)) {
David Benjamin3570d732015-06-29 00:28:17 -04001815 OPENSSL_PUT_ERROR(SSL, SSL_R_CHANNEL_ID_SIGNATURE_INVALID);
David Benjamin0d56f882015-12-19 17:05:56 -05001816 ssl->s3->tlsext_channel_id_valid = 0;
Adam Langleyfcf25832014-12-18 17:42:32 -08001817 goto err;
1818 }
Adam Langley1258b6a2014-06-20 12:00:00 -07001819
David Benjamin0d56f882015-12-19 17:05:56 -05001820 memcpy(ssl->s3->tlsext_channel_id, p, 64);
Adam Langleyfcf25832014-12-18 17:42:32 -08001821 ret = 1;
Adam Langley1258b6a2014-06-20 12:00:00 -07001822
1823err:
Adam Langleyfcf25832014-12-18 17:42:32 -08001824 BN_free(&x);
1825 BN_free(&y);
1826 BN_free(sig.r);
1827 BN_free(sig.s);
David Benjamin2755a3e2015-04-22 16:17:58 -04001828 EC_KEY_free(key);
1829 EC_POINT_free(point);
1830 EC_GROUP_free(p256);
Adam Langleyfcf25832014-12-18 17:42:32 -08001831 return ret;
1832}
David Benjamin9f1dc822016-06-07 17:03:46 -04001833
David Benjamin9f1dc822016-06-07 17:03:46 -04001834static int ssl3_send_new_session_ticket(SSL *ssl) {
David Benjamin75836432016-06-17 18:48:29 -04001835 if (ssl->state == SSL3_ST_SW_SESSION_TICKET_B) {
1836 return ssl->method->write_message(ssl);
David Benjamin9f1dc822016-06-07 17:03:46 -04001837 }
1838
David Benjamin75836432016-06-17 18:48:29 -04001839 CBB cbb, body, ticket;
Steven Valdez1e6f11a2016-07-27 11:10:52 -04001840 if (!ssl->method->init_message(ssl, &cbb, &body,
1841 SSL3_MT_NEW_SESSION_TICKET) ||
David Benjamin75836432016-06-17 18:48:29 -04001842 /* Ticket lifetime hint (advisory only): We leave this unspecified for
1843 * resumed session (for simplicity), and guess that tickets for new
1844 * sessions will live as long as their sessions. */
Steven Valdez1e6f11a2016-07-27 11:10:52 -04001845 !CBB_add_u32(&body,
1846 ssl->session != NULL ? 0 : ssl->s3->new_session->timeout) ||
1847 !CBB_add_u16_length_prefixed(&body, &ticket) ||
1848 !ssl_encrypt_ticket(ssl, &ticket, ssl->session != NULL
1849 ? ssl->session
1850 : ssl->s3->new_session) ||
David Benjamin75836432016-06-17 18:48:29 -04001851 !ssl->method->finish_message(ssl, &cbb)) {
Steven Valdez1e6f11a2016-07-27 11:10:52 -04001852 return 0;
David Benjamin75836432016-06-17 18:48:29 -04001853 }
1854
1855 ssl->state = SSL3_ST_SW_SESSION_TICKET_B;
Steven Valdez1e6f11a2016-07-27 11:10:52 -04001856 return ssl->method->write_message(ssl);
David Benjamin9f1dc822016-06-07 17:03:46 -04001857}