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Remove some redundant assignments
[thirdparty/openssl.git] / ssl / statem / statem_srvr.c
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8ba708e5 1/* ssl/statem/statem_srvr.c -*- mode:C; c-file-style: "eay" -*- */
58964a49 2/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
d02b48c6
RE		 3 * All rights reserved.
4 *
5 * This package is an SSL implementation written
6 * by Eric Young (eay@cryptsoft.com).
7 * The implementation was written so as to conform with Netscapes SSL.
0f113f3e 8 *
d02b48c6
RE		 9 * This library is free for commercial and non-commercial use as long as
10 * the following conditions are aheared to. The following conditions
11 * apply to all code found in this distribution, be it the RC4, RSA,
12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
13 * included with this distribution is covered by the same copyright terms
14 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
0f113f3e 15 *
d02b48c6
RE		 16 * Copyright remains Eric Young's, and as such any Copyright notices in
17 * the code are not to be removed.
18 * If this package is used in a product, Eric Young should be given attribution
19 * as the author of the parts of the library used.
20 * This can be in the form of a textual message at program startup or
21 * in documentation (online or textual) provided with the package.
0f113f3e 22 *
d02b48c6
RE		 23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
25 * are met:
26 * 1. Redistributions of source code must retain the copyright
27 * notice, this list of conditions and the following disclaimer.
28 * 2. Redistributions in binary form must reproduce the above copyright
29 * notice, this list of conditions and the following disclaimer in the
30 * documentation and/or other materials provided with the distribution.
31 * 3. All advertising materials mentioning features or use of this software
32 * must display the following acknowledgement:
33 * "This product includes cryptographic software written by
34 * Eric Young (eay@cryptsoft.com)"
35 * The word 'cryptographic' can be left out if the rouines from the library
36 * being used are not cryptographic related :-).
0f113f3e 37 * 4. If you include any Windows specific code (or a derivative thereof) from
d02b48c6
RE		 38 * the apps directory (application code) you must include an acknowledgement:
39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
0f113f3e 40 *
d02b48c6
RE		 41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51 * SUCH DAMAGE.
0f113f3e 52 *
d02b48c6
RE		 53 * The licence and distribution terms for any publically available version or
54 * derivative of this code cannot be changed. i.e. this code cannot simply be
55 * copied and put under another distribution licence
56 * [including the GNU Public Licence.]
57 */
8e2f6b79 58/* ====================================================================
52b8dad8 59 * Copyright (c) 1998-2007 The OpenSSL Project. All rights reserved.
8e2f6b79
BM		 60 *
61 * Redistribution and use in source and binary forms, with or without
62 * modification, are permitted provided that the following conditions
63 * are met:
64 *
65 * 1. Redistributions of source code must retain the above copyright
0f113f3e 66 * notice, this list of conditions and the following disclaimer.
8e2f6b79
BM		 67 *
68 * 2. Redistributions in binary form must reproduce the above copyright
69 * notice, this list of conditions and the following disclaimer in
70 * the documentation and/or other materials provided with the
71 * distribution.
72 *
73 * 3. All advertising materials mentioning features or use of this
74 * software must display the following acknowledgment:
75 * "This product includes software developed by the OpenSSL Project
76 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
77 *
78 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
79 * endorse or promote products derived from this software without
80 * prior written permission. For written permission, please contact
81 * openssl-core@openssl.org.
82 *
83 * 5. Products derived from this software may not be called "OpenSSL"
84 * nor may "OpenSSL" appear in their names without prior written
85 * permission of the OpenSSL Project.
86 *
87 * 6. Redistributions of any form whatsoever must retain the following
88 * acknowledgment:
89 * "This product includes software developed by the OpenSSL Project
90 * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
91 *
92 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
93 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
94 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
95 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
96 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
97 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
98 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
99 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
100 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
101 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
102 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
103 * OF THE POSSIBILITY OF SUCH DAMAGE.
104 * ====================================================================
105 *
106 * This product includes cryptographic software written by Eric Young
107 * (eay@cryptsoft.com). This product includes software written by Tim
108 * Hudson (tjh@cryptsoft.com).
109 *
110 */
ea262260
BM		 111/* ====================================================================
112 * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
113 *
0f113f3e 114 * Portions of the attached software ("Contribution") are developed by
ea262260
BM		 115 * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project.
116 *
117 * The Contribution is licensed pursuant to the OpenSSL open source
118 * license provided above.
119 *
ea262260
BM		 120 * ECC cipher suite support in OpenSSL originally written by
121 * Vipul Gupta and Sumit Gupta of Sun Microsystems Laboratories.
122 *
123 */
ddac1974
NL		 124/* ====================================================================
125 * Copyright 2005 Nokia. All rights reserved.
126 *
127 * The portions of the attached software ("Contribution") is developed by
128 * Nokia Corporation and is licensed pursuant to the OpenSSL open source
129 * license.
130 *
131 * The Contribution, originally written by Mika Kousa and Pasi Eronen of
132 * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites
133 * support (see RFC 4279) to OpenSSL.
134 *
135 * No patent licenses or other rights except those expressly stated in
136 * the OpenSSL open source license shall be deemed granted or received
137 * expressly, by implication, estoppel, or otherwise.
138 *
139 * No assurances are provided by Nokia that the Contribution does not
140 * infringe the patent or other intellectual property rights of any third
141 * party or that the license provides you with all the necessary rights
142 * to make use of the Contribution.
143 *
144 * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN
145 * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA
146 * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY
147 * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR
148 * OTHERWISE.
149 */
d02b48c6 150
de469ef2 151
d02b48c6 152#include <stdio.h>
8ba708e5 153#include "../ssl_locl.h"
61ae935a 154#include "statem_locl.h"
68570797 155#include "internal/constant_time_locl.h"
ec577822
BM		 156#include <openssl/buffer.h>
157#include <openssl/rand.h>
158#include <openssl/objects.h>
159#include <openssl/evp.h>
6434abbf 160#include <openssl/hmac.h>
ec577822 161#include <openssl/x509.h>
3eeaab4b 162#ifndef OPENSSL_NO_DH
0f113f3e 163# include <openssl/dh.h>
3eeaab4b 164#endif
d095b68d 165#include <openssl/bn.h>
dbad1690 166#include <openssl/md5.h>
f9b3bff6 167
38a3cbfb
EK		 168static STACK_OF(SSL_CIPHER) *ssl_bytes_to_cipher_list(SSL *s,
169 PACKET *cipher_suites,
170 STACK_OF(SSL_CIPHER) **skp,
171 int sslv2format, int *al);
d45ba43d 172
61ae935a
MC		 173/*
174 * server_read_transition() encapsulates the logic for the allowed handshake
175 * state transitions when the server is reading messages from the client. The
176 * message type that the client has sent is provided in |mt|. The current state
177 * is in |s->statem.hand_state|.
178 *
179 * Valid return values are:
180 * 1: Success (transition allowed)
181 * 0: Error (transition not allowed)
182 */
8481f583 183int ossl_statem_server_read_transition(SSL *s, int mt)
61ae935a 184{
d6f1a6e9 185 OSSL_STATEM *st = &s->statem;
61ae935a
MC		 186
187 switch(st->hand_state) {
188 case TLS_ST_BEFORE:
189 case DTLS_ST_SW_HELLO_VERIFY_REQUEST:
190 if (mt == SSL3_MT_CLIENT_HELLO) {
191 st->hand_state = TLS_ST_SR_CLNT_HELLO;
192 return 1;
193 }
194 break;
195
196 case TLS_ST_SW_SRVR_DONE:
197 /*
198 * If we get a CKE message after a ServerDone then either
199 * 1) We didn't request a Certificate
200 * OR
201 * 2) If we did request one then
202 * a) We allow no Certificate to be returned
203 * AND
204 * b) We are running SSL3 (in TLS1.0+ the client must return a 0
205 * list if we requested a certificate)
206 */
207 if (mt == SSL3_MT_CLIENT_KEY_EXCHANGE
208 && (!s->s3->tmp.cert_request
209 || (!((s->verify_mode & SSL_VERIFY_PEER) &&
210 (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
211 && (s->version == SSL3_VERSION)))) {
212 st->hand_state = TLS_ST_SR_KEY_EXCH;
213 return 1;
214 } else if (s->s3->tmp.cert_request) {
215 if (mt == SSL3_MT_CERTIFICATE) {
216 st->hand_state = TLS_ST_SR_CERT;
217 return 1;
218 }
219 }
220 break;
221
222 case TLS_ST_SR_CERT:
223 if (mt == SSL3_MT_CLIENT_KEY_EXCHANGE) {
224 st->hand_state = TLS_ST_SR_KEY_EXCH;
225 return 1;
226 }
227 break;
228
229 case TLS_ST_SR_KEY_EXCH:
230 /*
231 * We should only process a CertificateVerify message if we have
232 * received a Certificate from the client. If so then |s->session->peer|
233 * will be non NULL. In some instances a CertificateVerify message is
234 * not required even if the peer has sent a Certificate (e.g. such as in
a71a4966 235 * the case of static DH). In that case |st->no_cert_verify| should be
61ae935a
MC		 236 * set.
237 */
a71a4966 238 if (s->session->peer == NULL || st->no_cert_verify) {
61ae935a
MC		 239 if (mt == SSL3_MT_CHANGE_CIPHER_SPEC) {
240 /*
241 * For the ECDH ciphersuites when the client sends its ECDH
242 * pub key in a certificate, the CertificateVerify message is
243 * not sent. Also for GOST ciphersuites when the client uses
244 * its key from the certificate for key exchange.
245 */
246 st->hand_state = TLS_ST_SR_CHANGE;
247 return 1;
248 }
249 } else {
250 if (mt == SSL3_MT_CERTIFICATE_VERIFY) {
251 st->hand_state = TLS_ST_SR_CERT_VRFY;
252 return 1;
253 }
254 }
255 break;
256
257 case TLS_ST_SR_CERT_VRFY:
258 if (mt == SSL3_MT_CHANGE_CIPHER_SPEC) {
259 st->hand_state = TLS_ST_SR_CHANGE;
260 return 1;
261 }
262 break;
263
264 case TLS_ST_SR_CHANGE:
265#ifndef OPENSSL_NO_NEXTPROTONEG
266 if (s->s3->next_proto_neg_seen) {
267 if (mt == SSL3_MT_NEXT_PROTO) {
268 st->hand_state = TLS_ST_SR_NEXT_PROTO;
269 return 1;
270 }
271 } else {
272#endif
273 if (mt == SSL3_MT_FINISHED) {
274 st->hand_state = TLS_ST_SR_FINISHED;
275 return 1;
276 }
277#ifndef OPENSSL_NO_NEXTPROTONEG
278 }
279#endif
280 break;
281
282#ifndef OPENSSL_NO_NEXTPROTONEG
283 case TLS_ST_SR_NEXT_PROTO:
284 if (mt == SSL3_MT_FINISHED) {
285 st->hand_state = TLS_ST_SR_FINISHED;
286 return 1;
287 }
288 break;
289#endif
290
291 case TLS_ST_SW_FINISHED:
292 if (mt == SSL3_MT_CHANGE_CIPHER_SPEC) {
293 st->hand_state = TLS_ST_SR_CHANGE;
294 return 1;
295 }
296 break;
297
298 default:
299 break;
300 }
301
302 /* No valid transition found */
303 return 0;
304}
305
306/*
307 * Should we send a ServerKeyExchange message?
308 *
309 * Valid return values are:
310 * 1: Yes
311 * 0: No
312 */
bb3e20cf 313static int send_server_key_exchange(SSL *s)
61ae935a
MC		 314{
315 unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
316
317 /*
318 * only send a ServerKeyExchange if DH, fortezza or RSA but we have a
319 * sign only certificate PSK: may send PSK identity hints For
320 * ECC ciphersuites, we send a serverKeyExchange message only if
321 * the cipher suite is either ECDH-anon or ECDHE. In other cases,
322 * the server certificate contains the server's public key for
323 * key exchange.
324 */
325 if ( (alg_k & SSL_kDHE)
326 || (alg_k & SSL_kECDHE)
327 || ((alg_k & SSL_kRSA)
328 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
329 || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
330 && EVP_PKEY_size(s->cert->pkeys
331 [SSL_PKEY_RSA_ENC].privatekey) *
332 8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
333 )
334 )
335 )
336 /*
337 * PSK: send ServerKeyExchange if PSK identity hint if
338 * provided
339 */
340#ifndef OPENSSL_NO_PSK
341 /* Only send SKE if we have identity hint for plain PSK */
342 || ((alg_k & (SSL_kPSK | SSL_kRSAPSK))
343 && s->cert->psk_identity_hint)
344 /* For other PSK always send SKE */
345 || (alg_k & (SSL_PSK & (SSL_kDHEPSK | SSL_kECDHEPSK)))
346#endif
347#ifndef OPENSSL_NO_SRP
348 /* SRP: send ServerKeyExchange */
349 || (alg_k & SSL_kSRP)
350#endif
351 ) {
352 return 1;
353 }
354
355 return 0;
356}
357
358/*
359 * Should we send a CertificateRequest message?
360 *
361 * Valid return values are:
362 * 1: Yes
363 * 0: No
364 */
bb3e20cf 365static int send_certificate_request(SSL *s)
61ae935a
MC		 366{
367 if (
368 /* don't request cert unless asked for it: */
369 s->verify_mode & SSL_VERIFY_PEER
370 /*
371 * if SSL_VERIFY_CLIENT_ONCE is set, don't request cert
372 * during re-negotiation:
373 */
374 && ((s->session->peer == NULL) ||
375 !(s->verify_mode & SSL_VERIFY_CLIENT_ONCE))
376 /*
377 * never request cert in anonymous ciphersuites (see
378 * section "Certificate request" in SSL 3 drafts and in
379 * RFC 2246):
380 */
381 && (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
382 /*
383 * ... except when the application insists on
384 * verification (against the specs, but s3_clnt.c accepts
385 * this for SSL 3)
386 */
387 || (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
388 /* don't request certificate for SRP auth */
389 && !(s->s3->tmp.new_cipher->algorithm_auth & SSL_aSRP)
390 /*
391 * With normal PSK Certificates and Certificate Requests
392 * are omitted
393 */
b7fa1f98 394 && !(s->s3->tmp.new_cipher->algorithm_auth & SSL_aPSK)) {
61ae935a
MC		 395 return 1;
396 }
397
398 return 0;
399}
400
401/*
402 * server_write_transition() works out what handshake state to move to next
403 * when the server is writing messages to be sent to the client.
404 */
8481f583 405WRITE_TRAN ossl_statem_server_write_transition(SSL *s)
61ae935a 406{
d6f1a6e9 407 OSSL_STATEM *st = &s->statem;
61ae935a
MC		 408
409 switch(st->hand_state) {
410 case TLS_ST_BEFORE:
411 /* Just go straight to trying to read from the client */;
412 return WRITE_TRAN_FINISHED;
413
414 case TLS_ST_OK:
415 /* We must be trying to renegotiate */
416 st->hand_state = TLS_ST_SW_HELLO_REQ;
417 return WRITE_TRAN_CONTINUE;
418
419 case TLS_ST_SW_HELLO_REQ:
420 st->hand_state = TLS_ST_OK;
fe3a3291 421 ossl_statem_set_in_init(s, 0);
61ae935a
MC		 422 return WRITE_TRAN_CONTINUE;
423
424 case TLS_ST_SR_CLNT_HELLO:
425 if (SSL_IS_DTLS(s) && !s->d1->cookie_verified
426 && (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE))
427 st->hand_state = DTLS_ST_SW_HELLO_VERIFY_REQUEST;
428 else
429 st->hand_state = TLS_ST_SW_SRVR_HELLO;
430 return WRITE_TRAN_CONTINUE;
431
432 case DTLS_ST_SW_HELLO_VERIFY_REQUEST:
433 return WRITE_TRAN_FINISHED;
434
435 case TLS_ST_SW_SRVR_HELLO:
436 if (s->hit) {
437 if (s->tlsext_ticket_expected)
438 st->hand_state = TLS_ST_SW_SESSION_TICKET;
439 else
440 st->hand_state = TLS_ST_SW_CHANGE;
441 } else {
442 /* Check if it is anon DH or anon ECDH, */
443 /* normal PSK or SRP */
444 if (!(s->s3->tmp.new_cipher->algorithm_auth &
445 (SSL_aNULL | SSL_aSRP | SSL_aPSK))) {
446 st->hand_state = TLS_ST_SW_CERT;
447 } else if (send_server_key_exchange(s)) {
448 st->hand_state = TLS_ST_SW_KEY_EXCH;
449 } else if (send_certificate_request(s)) {
450 st->hand_state = TLS_ST_SW_CERT_REQ;
451 } else {
452 st->hand_state = TLS_ST_SW_SRVR_DONE;
453 }
454 }
455 return WRITE_TRAN_CONTINUE;
456
457 case TLS_ST_SW_CERT:
458 if (s->tlsext_status_expected) {
459 st->hand_state = TLS_ST_SW_CERT_STATUS;
460 return WRITE_TRAN_CONTINUE;
461 }
462 /* Fall through */
463
464 case TLS_ST_SW_CERT_STATUS:
465 if (send_server_key_exchange(s)) {
466 st->hand_state = TLS_ST_SW_KEY_EXCH;
467 return WRITE_TRAN_CONTINUE;
468 }
469 /* Fall through */
470
471 case TLS_ST_SW_KEY_EXCH:
472 if (send_certificate_request(s)) {
473 st->hand_state = TLS_ST_SW_CERT_REQ;
474 return WRITE_TRAN_CONTINUE;
475 }
476 /* Fall through */
477
478 case TLS_ST_SW_CERT_REQ:
479 st->hand_state = TLS_ST_SW_SRVR_DONE;
480 return WRITE_TRAN_CONTINUE;
481
482 case TLS_ST_SW_SRVR_DONE:
483 return WRITE_TRAN_FINISHED;
484
485 case TLS_ST_SR_FINISHED:
486 if (s->hit) {
487 st->hand_state = TLS_ST_OK;
fe3a3291 488 ossl_statem_set_in_init(s, 0);
61ae935a
MC		 489 return WRITE_TRAN_CONTINUE;
490 } else if (s->tlsext_ticket_expected) {
491 st->hand_state = TLS_ST_SW_SESSION_TICKET;
492 } else {
493 st->hand_state = TLS_ST_SW_CHANGE;
494 }
495 return WRITE_TRAN_CONTINUE;
496
497 case TLS_ST_SW_SESSION_TICKET:
498 st->hand_state = TLS_ST_SW_CHANGE;
499 return WRITE_TRAN_CONTINUE;
500
501 case TLS_ST_SW_CHANGE:
502 st->hand_state = TLS_ST_SW_FINISHED;
503 return WRITE_TRAN_CONTINUE;
504
505 case TLS_ST_SW_FINISHED:
506 if (s->hit) {
507 return WRITE_TRAN_FINISHED;
508 }
509 st->hand_state = TLS_ST_OK;
fe3a3291 510 ossl_statem_set_in_init(s, 0);
61ae935a
MC		 511 return WRITE_TRAN_CONTINUE;
512
513 default:
514 /* Shouldn't happen */
515 return WRITE_TRAN_ERROR;
516 }
517}
518
519/*
520 * Perform any pre work that needs to be done prior to sending a message from
521 * the server to the client.
522 */
8481f583 523WORK_STATE ossl_statem_server_pre_work(SSL *s, WORK_STATE wst)
61ae935a 524{
d6f1a6e9 525 OSSL_STATEM *st = &s->statem;
61ae935a
MC		 526
527 switch(st->hand_state) {
528 case TLS_ST_SW_HELLO_REQ:
529 s->shutdown = 0;
530 if (SSL_IS_DTLS(s))
531 dtls1_clear_record_buffer(s);
532 break;
533
534 case DTLS_ST_SW_HELLO_VERIFY_REQUEST:
535 s->shutdown = 0;
536 if (SSL_IS_DTLS(s)) {
537 dtls1_clear_record_buffer(s);
538 /* We don't buffer this message so don't use the timer */
539 st->use_timer = 0;
540 }
541 break;
542
543 case TLS_ST_SW_SRVR_HELLO:
544 if (SSL_IS_DTLS(s)) {
545 /*
546 * Messages we write from now on should be bufferred and
547 * retransmitted if necessary, so we need to use the timer now
548 */
549 st->use_timer = 1;
550 }
551 break;
552
553 case TLS_ST_SW_SRVR_DONE:
554#ifndef OPENSSL_NO_SCTP
555 if (SSL_IS_DTLS(s) && BIO_dgram_is_sctp(SSL_get_wbio(s)))
556 return dtls_wait_for_dry(s);
557#endif
558 return WORK_FINISHED_CONTINUE;
559
560 case TLS_ST_SW_SESSION_TICKET:
561 if (SSL_IS_DTLS(s)) {
562 /*
563 * We're into the last flight. We don't retransmit the last flight
564 * unless we need to, so we don't use the timer
565 */
566 st->use_timer = 0;
567 }
568 break;
569
570 case TLS_ST_SW_CHANGE:
571 s->session->cipher = s->s3->tmp.new_cipher;
572 if (!s->method->ssl3_enc->setup_key_block(s)) {
fe3a3291 573 ossl_statem_set_error(s);
61ae935a
MC		 574 return WORK_ERROR;
575 }
576 if (SSL_IS_DTLS(s)) {
577 /*
578 * We're into the last flight. We don't retransmit the last flight
579 * unless we need to, so we don't use the timer. This might have
580 * already been set to 0 if we sent a NewSessionTicket message,
581 * but we'll set it again here in case we didn't.
582 */
583 st->use_timer = 0;
584 }
585 return WORK_FINISHED_CONTINUE;
586
587 case TLS_ST_OK:
588 return tls_finish_handshake(s, wst);
589
590 default:
591 /* No pre work to be done */
592 break;
593 }
594
595 return WORK_FINISHED_CONTINUE;
596}
597
598/*
599 * Perform any work that needs to be done after sending a message from the
600 * server to the client.
601 */
8481f583 602WORK_STATE ossl_statem_server_post_work(SSL *s, WORK_STATE wst)
61ae935a 603{
d6f1a6e9 604 OSSL_STATEM *st = &s->statem;
61ae935a
MC		 605
606 s->init_num = 0;
607
608 switch(st->hand_state) {
609 case TLS_ST_SW_HELLO_REQ:
610 if (statem_flush(s) != 1)
611 return WORK_MORE_A;
612 ssl3_init_finished_mac(s);
613 break;
614
615 case DTLS_ST_SW_HELLO_VERIFY_REQUEST:
616 if (statem_flush(s) != 1)
617 return WORK_MORE_A;
618 /* HelloVerifyRequest resets Finished MAC */
619 if (s->version != DTLS1_BAD_VER)
620 ssl3_init_finished_mac(s);
621 /*
622 * The next message should be another ClientHello which we need to
623 * treat like it was the first packet
624 */
625 s->first_packet = 1;
626 break;
627
628 case TLS_ST_SW_SRVR_HELLO:
629#ifndef OPENSSL_NO_SCTP
630 if (SSL_IS_DTLS(s) && s->hit) {
631 unsigned char sctpauthkey[64];
632 char labelbuffer[sizeof(DTLS1_SCTP_AUTH_LABEL)];
633
634 /*
635 * Add new shared key for SCTP-Auth, will be ignored if no
636 * SCTP used.
637 */
141eb8c6
MC		 638 memcpy(labelbuffer, DTLS1_SCTP_AUTH_LABEL,
639 sizeof(DTLS1_SCTP_AUTH_LABEL));
61ae935a
MC		 640
641 if (SSL_export_keying_material(s, sctpauthkey,
642 sizeof(sctpauthkey), labelbuffer,
643 sizeof(labelbuffer), NULL, 0, 0) <= 0) {
fe3a3291 644 ossl_statem_set_error(s);
61ae935a
MC		 645 return WORK_ERROR;
646 }
647
648 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
649 sizeof(sctpauthkey), sctpauthkey);
650 }
651#endif
652 break;
653
654 case TLS_ST_SW_CHANGE:
655#ifndef OPENSSL_NO_SCTP
656 if (SSL_IS_DTLS(s) && !s->hit) {
657 /*
658 * Change to new shared key of SCTP-Auth, will be ignored if
659 * no SCTP used.
660 */
661 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY,
662 0, NULL);
663 }
664#endif
665 if (!s->method->ssl3_enc->change_cipher_state(s,
666 SSL3_CHANGE_CIPHER_SERVER_WRITE)) {
fe3a3291 667 ossl_statem_set_error(s);
61ae935a
MC		 668 return WORK_ERROR;
669 }
670
671 if (SSL_IS_DTLS(s))
672 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
673 break;
674
675 case TLS_ST_SW_SRVR_DONE:
676 if (statem_flush(s) != 1)
677 return WORK_MORE_A;
678 break;
679
680 case TLS_ST_SW_FINISHED:
681 if (statem_flush(s) != 1)
682 return WORK_MORE_A;
683#ifndef OPENSSL_NO_SCTP
684 if (SSL_IS_DTLS(s) && s->hit) {
685 /*
686 * Change to new shared key of SCTP-Auth, will be ignored if
687 * no SCTP used.
688 */
689 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY,
690 0, NULL);
691 }
692#endif
693 break;
694
695 default:
696 /* No post work to be done */
697 break;
698 }
699
700 return WORK_FINISHED_CONTINUE;
701}
702
703/*
704 * Construct a message to be sent from the server to the client.
705 *
706 * Valid return values are:
707 * 1: Success
708 * 0: Error
709 */
8481f583 710int ossl_statem_server_construct_message(SSL *s)
61ae935a 711{
d6f1a6e9 712 OSSL_STATEM *st = &s->statem;
61ae935a
MC		 713
714 switch(st->hand_state) {
715 case DTLS_ST_SW_HELLO_VERIFY_REQUEST:
716 return dtls_construct_hello_verify_request(s);
717
718 case TLS_ST_SW_HELLO_REQ:
719 return tls_construct_hello_request(s);
720
721 case TLS_ST_SW_SRVR_HELLO:
722 return tls_construct_server_hello(s);
723
724 case TLS_ST_SW_CERT:
725 return tls_construct_server_certificate(s);
726
727 case TLS_ST_SW_KEY_EXCH:
728 return tls_construct_server_key_exchange(s);
729
730 case TLS_ST_SW_CERT_REQ:
731 return tls_construct_certificate_request(s);
732
733 case TLS_ST_SW_SRVR_DONE:
734 return tls_construct_server_done(s);
735
736 case TLS_ST_SW_SESSION_TICKET:
737 return tls_construct_new_session_ticket(s);
738
739 case TLS_ST_SW_CERT_STATUS:
740 return tls_construct_cert_status(s);
741
742 case TLS_ST_SW_CHANGE:
743 if (SSL_IS_DTLS(s))
744 return dtls_construct_change_cipher_spec(s);
745 else
746 return tls_construct_change_cipher_spec(s);
747
748 case TLS_ST_SW_FINISHED:
749 return tls_construct_finished(s,
750 s->method->
751 ssl3_enc->server_finished_label,
752 s->method->
753 ssl3_enc->server_finished_label_len);
754
755 default:
756 /* Shouldn't happen */
757 break;
758 }
759
760 return 0;
761}
762
763#define CLIENT_KEY_EXCH_MAX_LENGTH 2048
764#define NEXT_PROTO_MAX_LENGTH 514
765
766/*
767 * Returns the maximum allowed length for the current message that we are
768 * reading. Excludes the message header.
769 */
8481f583 770unsigned long ossl_statem_server_max_message_size(SSL *s)
61ae935a 771{
d6f1a6e9 772 OSSL_STATEM *st = &s->statem;
61ae935a
MC		 773
774 switch(st->hand_state) {
775 case TLS_ST_SR_CLNT_HELLO:
776 return SSL3_RT_MAX_PLAIN_LENGTH;
777
778 case TLS_ST_SR_CERT:
779 return s->max_cert_list;
780
781 case TLS_ST_SR_KEY_EXCH:
782 return CLIENT_KEY_EXCH_MAX_LENGTH;
783
784 case TLS_ST_SR_CERT_VRFY:
785 return SSL3_RT_MAX_PLAIN_LENGTH;
786
787#ifndef OPENSSL_NO_NEXTPROTONEG
788 case TLS_ST_SR_NEXT_PROTO:
789 return NEXT_PROTO_MAX_LENGTH;
790#endif
791
792 case TLS_ST_SR_CHANGE:
793 return CCS_MAX_LENGTH;
794
795 case TLS_ST_SR_FINISHED:
796 return FINISHED_MAX_LENGTH;
797
798 default:
799 /* Shouldn't happen */
800 break;
801 }
802
803 return 0;
804}
805
806/*
807 * Process a message that the server has received from the client.
808 */
8481f583 809MSG_PROCESS_RETURN ossl_statem_server_process_message(SSL *s, PACKET *pkt)
61ae935a 810{
d6f1a6e9 811 OSSL_STATEM *st = &s->statem;
61ae935a
MC		 812
813 switch(st->hand_state) {
814 case TLS_ST_SR_CLNT_HELLO:
815 return tls_process_client_hello(s, pkt);
816
817 case TLS_ST_SR_CERT:
818 return tls_process_client_certificate(s, pkt);
819
820 case TLS_ST_SR_KEY_EXCH:
821 return tls_process_client_key_exchange(s, pkt);
822
823 case TLS_ST_SR_CERT_VRFY:
824 return tls_process_cert_verify(s, pkt);
825
826#ifndef OPENSSL_NO_NEXTPROTONEG
827 case TLS_ST_SR_NEXT_PROTO:
828 return tls_process_next_proto(s, pkt);
829#endif
830
831 case TLS_ST_SR_CHANGE:
832 return tls_process_change_cipher_spec(s, pkt);
833
834 case TLS_ST_SR_FINISHED:
835 return tls_process_finished(s, pkt);
836
837 default:
838 /* Shouldn't happen */
839 break;
840 }
841
842 return MSG_PROCESS_ERROR;
843}
844
845/*
846 * Perform any further processing required following the receipt of a message
847 * from the client
848 */
8481f583 849WORK_STATE ossl_statem_server_post_process_message(SSL *s, WORK_STATE wst)
61ae935a 850{
d6f1a6e9 851 OSSL_STATEM *st = &s->statem;
61ae935a
MC		 852
853 switch(st->hand_state) {
854 case TLS_ST_SR_CLNT_HELLO:
855 return tls_post_process_client_hello(s, wst);
856
857 case TLS_ST_SR_KEY_EXCH:
858 return tls_post_process_client_key_exchange(s, wst);
859
860 case TLS_ST_SR_CERT_VRFY:
861#ifndef OPENSSL_NO_SCTP
862 if ( /* Is this SCTP? */
863 BIO_dgram_is_sctp(SSL_get_wbio(s))
864 /* Are we renegotiating? */
865 && s->renegotiate
866 && BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) {
867 s->s3->in_read_app_data = 2;
868 s->rwstate = SSL_READING;
869 BIO_clear_retry_flags(SSL_get_rbio(s));
870 BIO_set_retry_read(SSL_get_rbio(s));
871 statem_set_sctp_read_sock(s, 1);
872 return WORK_MORE_A;
873 } else {
fe3a3291 874 ossl_ossl_statem_set_sctp_read_sock(s, 0);
61ae935a
MC		 875 }
876#endif
877 return WORK_FINISHED_CONTINUE;
878
61ae935a
MC		 879 default:
880 break;
881 }
882
883 /* Shouldn't happen */
884 return WORK_ERROR;
885}
886
edc032b5 887#ifndef OPENSSL_NO_SRP
71fa4513 888static int ssl_check_srp_ext_ClientHello(SSL *s, int *al)
0f113f3e
MC		 889{
890 int ret = SSL_ERROR_NONE;
891
892 *al = SSL_AD_UNRECOGNIZED_NAME;
893
894 if ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kSRP) &&
895 (s->srp_ctx.TLS_ext_srp_username_callback != NULL)) {
896 if (s->srp_ctx.login == NULL) {
897 /*
898 * RFC 5054 says SHOULD reject, we do so if There is no srp
899 * login name
900 */
901 ret = SSL3_AL_FATAL;
902 *al = SSL_AD_UNKNOWN_PSK_IDENTITY;
903 } else {
904 ret = SSL_srp_server_param_with_username(s, al);
905 }
906 }
907 return ret;
908}
edc032b5
BL		 909#endif
910
e27f234a
MC		 911int tls_construct_hello_request(SSL *s)
912{
913 if (!ssl_set_handshake_header(s, SSL3_MT_HELLO_REQUEST, 0)) {
914 SSLerr(SSL_F_TLS_CONSTRUCT_HELLO_REQUEST, ERR_R_INTERNAL_ERROR);
fe3a3291 915 ossl_statem_set_error(s);
e27f234a
MC		 916 return 0;
917 }
918
919 return 1;
920}
921
8ba708e5
MC		 922unsigned int dtls_raw_hello_verify_request(unsigned char *buf,
923 unsigned char *cookie,
924 unsigned char cookie_len)
925{
926 unsigned int msg_len;
927 unsigned char *p;
928
929 p = buf;
930 /* Always use DTLS 1.0 version: see RFC 6347 */
931 *(p++) = DTLS1_VERSION >> 8;
932 *(p++) = DTLS1_VERSION & 0xFF;
933
934 *(p++) = (unsigned char)cookie_len;
935 memcpy(p, cookie, cookie_len);
936 p += cookie_len;
937 msg_len = p - buf;
938
939 return msg_len;
940}
941
942int dtls_construct_hello_verify_request(SSL *s)
943{
944 unsigned int len;
945 unsigned char *buf;
946
947 buf = (unsigned char *)s->init_buf->data;
948
949 if (s->ctx->app_gen_cookie_cb == NULL ||
950 s->ctx->app_gen_cookie_cb(s, s->d1->cookie,
951 &(s->d1->cookie_len)) == 0 ||
952 s->d1->cookie_len > 255) {
f0659bdb 953 SSLerr(SSL_F_DTLS_CONSTRUCT_HELLO_VERIFY_REQUEST,
8ba708e5 954 SSL_R_COOKIE_GEN_CALLBACK_FAILURE);
fe3a3291 955 ossl_statem_set_error(s);
8ba708e5
MC		 956 return 0;
957 }
958
959 len = dtls_raw_hello_verify_request(&buf[DTLS1_HM_HEADER_LENGTH],
960 s->d1->cookie, s->d1->cookie_len);
961
962 dtls1_set_message_header(s, buf, DTLS1_MT_HELLO_VERIFY_REQUEST, len, 0,
963 len);
964 len += DTLS1_HM_HEADER_LENGTH;
965
966 /* number of bytes to write */
967 s->init_num = len;
968 s->init_off = 0;
969
970 return 1;
971}
972
be3583fa 973MSG_PROCESS_RETURN tls_process_client_hello(SSL *s, PACKET *pkt)
e27f234a
MC		 974{
975 int i, al = SSL_AD_INTERNAL_ERROR;
976 unsigned int j, complen = 0;
977 unsigned long id;
978 SSL_CIPHER *c;
979#ifndef OPENSSL_NO_COMP
980 SSL_COMP *comp = NULL;
981#endif
982 STACK_OF(SSL_CIPHER) *ciphers = NULL;
983 int protverr = 1;
984 /* |cookie| will only be initialized for DTLS. */
73999b62 985 PACKET session_id, cipher_suites, compression, extensions, cookie;
e27f234a
MC		 986 int is_v2_record;
987
b3e2272c
EK		 988 is_v2_record = RECORD_LAYER_is_sslv2_record(&s->rlayer);
989
bbafa47b 990 PACKET_null_init(&cookie);
32ec4153 991 /* First lets get s->client_version set correctly */
b3e2272c 992 if (is_v2_record) {
9ceb2426
MC		 993 unsigned int version;
994 unsigned int mt;
32ec4153
MC		 995 /*-
996 * An SSLv3/TLSv1 backwards-compatible CLIENT-HELLO in an SSLv2
997 * header is sent directly on the wire, not wrapped as a TLS
998 * record. Our record layer just processes the message length and passes
999 * the rest right through. Its format is:
1000 * Byte Content
1001 * 0-1 msg_length - decoded by the record layer
1002 * 2 msg_type - s->init_msg points here
1003 * 3-4 version
1004 * 5-6 cipher_spec_length
1005 * 7-8 session_id_length
1006 * 9-10 challenge_length
1007 * ... ...
1008 */
1009
73999b62 1010 if (!PACKET_get_1(pkt, &mt)
9ceb2426 1011 || mt != SSL2_MT_CLIENT_HELLO) {
32ec4153
MC		 1012 /*
1013 * Should never happen. We should have tested this in the record
1014 * layer in order to have determined that this is a SSLv2 record
1015 * in the first place
1016 */
e27f234a 1017 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
d45ba43d 1018 goto err;
32ec4153
MC		 1019 }
1020
73999b62 1021 if (!PACKET_get_net_2(pkt, &version)) {
9ceb2426 1022 /* No protocol version supplied! */
e27f234a 1023 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_UNKNOWN_PROTOCOL);
9ceb2426
MC		 1024 goto err;
1025 }
1026 if (version == 0x0002) {
32ec4153 1027 /* This is real SSLv2. We don't support it. */
e27f234a 1028 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_UNKNOWN_PROTOCOL);
32ec4153 1029 goto err;
9ceb2426 1030 } else if ((version & 0xff00) == (SSL3_VERSION_MAJOR << 8)) {
32ec4153 1031 /* SSLv3/TLS */
9ceb2426 1032 s->client_version = version;
32ec4153
MC		 1033 } else {
1034 /* No idea what protocol this is */
e27f234a 1035 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_UNKNOWN_PROTOCOL);
32ec4153
MC		 1036 goto err;
1037 }
1038 } else {
1039 /*
9ceb2426
MC		 1040 * use version from inside client hello, not from record header (may
1041 * differ: see RFC 2246, Appendix E, second paragraph)
32ec4153 1042 */
73999b62 1043 if(!PACKET_get_net_2(pkt, (unsigned int *)&s->client_version)) {
32ec4153 1044 al = SSL_AD_DECODE_ERROR;
e27f234a 1045 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_LENGTH_TOO_SHORT);
32ec4153
MC		 1046 goto f_err;
1047 }
5e9f0eeb
MC		 1048 }
1049
32ec4153
MC		 1050 /* Do SSL/TLS version negotiation if applicable */
1051 if (!SSL_IS_DTLS(s)) {
1052 if (s->version != TLS_ANY_VERSION) {
b2ce0337 1053 if (s->client_version >= s->version) {
32ec4153
MC		 1054 protverr = 0;
1055 }
b2ce0337 1056 } else if (s->client_version >= SSL3_VERSION) {
32ec4153
MC		 1057 switch(s->client_version) {
1058 default:
1059 case TLS1_2_VERSION:
1060 if(!(s->options & SSL_OP_NO_TLSv1_2)) {
1061 s->version = TLS1_2_VERSION;
1062 s->method = TLSv1_2_server_method();
1063 protverr = 0;
1064 break;
1065 }
1066 /* Deliberately fall through */
1067 case TLS1_1_VERSION:
1068 if(!(s->options & SSL_OP_NO_TLSv1_1)) {
1069 s->version = TLS1_1_VERSION;
1070 s->method = TLSv1_1_server_method();
1071 protverr = 0;
1072 break;
1073 }
1074 /* Deliberately fall through */
1075 case TLS1_VERSION:
1076 if(!(s->options & SSL_OP_NO_TLSv1)) {
1077 s->version = TLS1_VERSION;
1078 s->method = TLSv1_server_method();
1079 protverr = 0;
1080 break;
1081 }
1082 /* Deliberately fall through */
1083 case SSL3_VERSION:
b2ce0337 1084#ifndef OPENSSL_NO_SSL3
32ec4153
MC		 1085 if(!(s->options & SSL_OP_NO_SSLv3)) {
1086 s->version = SSL3_VERSION;
1087 s->method = SSLv3_server_method();
1088 protverr = 0;
1089 break;
1090 }
b2ce0337
MC		 1091#else
1092 break;
1093#endif
32ec4153
MC		 1094 }
1095 }
b2ce0337
MC		 1096 } else if (s->client_version <= s->version
1097 || s->method->version == DTLS_ANY_VERSION) {
32ec4153
MC		 1098 /*
1099 * For DTLS we just check versions are potentially compatible. Version
1100 * negotiation comes later.
1101 */
1102 protverr = 0;
1103 }
1104
1105 if (protverr) {
e27f234a 1106 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_UNKNOWN_PROTOCOL);
32ec4153 1107 if ((!s->enc_write_ctx && !s->write_hash)) {
0f113f3e
MC		 1108 /*
1109 * similar to ssl3_get_record, send alert using remote version
1110 * number
1111 */
1112 s->version = s->client_version;
1113 }
1114 al = SSL_AD_PROTOCOL_VERSION;
1115 goto f_err;
1116 }
1117
b3e2272c
EK		 1118 /* Parse the message and load client random. */
1119 if (is_v2_record) {
32ec4153
MC		 1120 /*
1121 * Handle an SSLv2 backwards compatible ClientHello
1122 * Note, this is only for SSLv3+ using the backward compatible format.
1123 * Real SSLv2 is not supported, and is rejected above.
1124 */
ec30e856 1125 unsigned int cipher_len, session_id_len, challenge_len;
b3e2272c 1126 PACKET challenge;
0f113f3e 1127
73999b62
MC		 1128 if (!PACKET_get_net_2(pkt, &cipher_len)
1129 || !PACKET_get_net_2(pkt, &session_id_len)
1130 || !PACKET_get_net_2(pkt, &challenge_len)) {
e27f234a
MC		 1131 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO,
1132 SSL_R_RECORD_LENGTH_MISMATCH);
6c3cca57
AE		 1133 al = SSL_AD_DECODE_ERROR;
1134 goto f_err;
5e9f0eeb 1135 }
0f113f3e 1136
73999b62
MC		 1137 if (!PACKET_get_sub_packet(pkt, &cipher_suites, cipher_len)
1138 || !PACKET_get_sub_packet(pkt, &session_id, session_id_len)
1139 || !PACKET_get_sub_packet(pkt, &challenge, challenge_len)
b3e2272c 1140 /* No extensions. */
73999b62 1141 || PACKET_remaining(pkt) != 0) {
f0659bdb
MC		 1142 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO,
1143 SSL_R_RECORD_LENGTH_MISMATCH);
9ceb2426
MC		 1144 al = SSL_AD_DECODE_ERROR;
1145 goto f_err;
1146 }
1147
32ec4153 1148 /* Load the client random */
b3e2272c
EK		 1149 challenge_len = challenge_len > SSL3_RANDOM_SIZE ? SSL3_RANDOM_SIZE :
1150 challenge_len;
32ec4153 1151 memset(s->s3->client_random, 0, SSL3_RANDOM_SIZE);
b3e2272c
EK		 1152 if (!PACKET_copy_bytes(&challenge,
1153 s->s3->client_random + SSL3_RANDOM_SIZE -
1154 challenge_len, challenge_len)) {
f0659bdb 1155 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
b3e2272c 1156 al = SSL_AD_INTERNAL_ERROR;
9ceb2426
MC		 1157 goto f_err;
1158 }
b3e2272c
EK		 1159
1160 PACKET_null_init(&compression);
1161 PACKET_null_init(&extensions);
0f113f3e 1162 } else {
b3e2272c 1163 /* Regular ClientHello. */
73999b62
MC		 1164 if (!PACKET_copy_bytes(pkt, s->s3->client_random, SSL3_RANDOM_SIZE)
1165 || !PACKET_get_length_prefixed_1(pkt, &session_id)) {
9ceb2426 1166 al = SSL_AD_DECODE_ERROR;
f0659bdb 1167 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_LENGTH_MISMATCH);
9ceb2426
MC		 1168 goto f_err;
1169 }
32ec4153 1170
b3e2272c 1171 if (SSL_IS_DTLS(s)) {
73999b62 1172 if (!PACKET_get_length_prefixed_1(pkt, &cookie)) {
32ec4153 1173 al = SSL_AD_DECODE_ERROR;
f0659bdb 1174 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_LENGTH_MISMATCH);
32ec4153
MC		 1175 goto f_err;
1176 }
b3e2272c
EK		 1177 /*
1178 * If we require cookies and this ClientHello doesn't contain one,
1179 * just return since we do not want to allocate any memory yet.
1180 * So check cookie length...
1181 */
1182 if (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) {
1183 if (PACKET_remaining(&cookie) == 0)
32ec4153 1184 return 1;
b3e2272c 1185 }
5e9f0eeb 1186 }
0f113f3e 1187
73999b62
MC		 1188 if (!PACKET_get_length_prefixed_2(pkt, &cipher_suites)
1189 || !PACKET_get_length_prefixed_1(pkt, &compression)) {
b3e2272c 1190 al = SSL_AD_DECODE_ERROR;
f0659bdb 1191 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_LENGTH_MISMATCH);
b3e2272c
EK		 1192 goto f_err;
1193 }
1194 /* Could be empty. */
73999b62 1195 extensions = *pkt;
b3e2272c
EK		 1196 }
1197
1198 s->hit = 0;
1199
1200 /*
1201 * We don't allow resumption in a backwards compatible ClientHello.
1202 * TODO(openssl-team): in TLS1.1+, session_id MUST be empty.
1203 *
1204 * Versions before 0.9.7 always allow clients to resume sessions in
1205 * renegotiation. 0.9.7 and later allow this by default, but optionally
1206 * ignore resumption requests with flag
1207 * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION (it's a new flag rather
1208 * than a change to default behavior so that applications relying on
1209 * this for security won't even compile against older library versions).
1210 * 1.0.1 and later also have a function SSL_renegotiate_abbreviated() to
1211 * request renegotiation but not a new session (s->new_session remains
1212 * unset): for servers, this essentially just means that the
1213 * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION setting will be
1214 * ignored.
1215 */
1216 if (is_v2_record ||
1217 (s->new_session &&
1218 (s->options & SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION))) {
1219 if (!ssl_get_new_session(s, 1))
1220 goto err;
1221 } else {
1222 i = ssl_get_prev_session(s, &extensions, &session_id);
0f113f3e 1223 /*
b3e2272c
EK		 1224 * Only resume if the session's version matches the negotiated
1225 * version.
1226 * RFC 5246 does not provide much useful advice on resumption
1227 * with a different protocol version. It doesn't forbid it but
1228 * the sanity of such behaviour would be questionable.
1229 * In practice, clients do not accept a version mismatch and
1230 * will abort the handshake with an error.
0f113f3e 1231 */
b3e2272c
EK		 1232 if (i == 1 && s->version == s->session->ssl_version) {
1233 /* previous session */
1234 s->hit = 1;
1235 } else if (i == -1) {
1236 goto err;
32ec4153 1237 } else {
b3e2272c
EK		 1238 /* i == 0 */
1239 if (!ssl_get_new_session(s, 1))
32ec4153 1240 goto err;
0f113f3e 1241 }
b3e2272c 1242 }
0f113f3e 1243
b3e2272c 1244 if (SSL_IS_DTLS(s)) {
e27f234a 1245 /* Empty cookie was already handled above by returning early. */
31011544 1246 if (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) {
b3e2272c 1247 if (s->ctx->app_verify_cookie_cb != NULL) {
31011544
EK		 1248 if (s->ctx->app_verify_cookie_cb(s, PACKET_data(&cookie),
1249 PACKET_remaining(&cookie)) == 0) {
32ec4153 1250 al = SSL_AD_HANDSHAKE_FAILURE;
f0659bdb 1251 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO,
b3e2272c 1252 SSL_R_COOKIE_MISMATCH);
32ec4153 1253 goto f_err;
31011544 1254 /* else cookie verification succeeded */
32ec4153 1255 }
b3e2272c 1256 /* default verification */
31011544
EK		 1257 } else if (!PACKET_equal(&cookie, s->d1->cookie,
1258 s->d1->cookie_len)) {
b3e2272c 1259 al = SSL_AD_HANDSHAKE_FAILURE;
f0659bdb 1260 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_COOKIE_MISMATCH);
b3e2272c 1261 goto f_err;
32ec4153 1262 }
e27f234a 1263 s->d1->cookie_verified = 1;
0f113f3e 1264 }
b3e2272c
EK		 1265 if (s->method->version == DTLS_ANY_VERSION) {
1266 /* Select version to use */
1267 if (s->client_version <= DTLS1_2_VERSION &&
1268 !(s->options & SSL_OP_NO_DTLSv1_2)) {
1269 s->version = DTLS1_2_VERSION;
1270 s->method = DTLSv1_2_server_method();
1271 } else if (tls1_suiteb(s)) {
f0659bdb 1272 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO,
b3e2272c
EK		 1273 SSL_R_ONLY_DTLS_1_2_ALLOWED_IN_SUITEB_MODE);
1274 s->version = s->client_version;
1275 al = SSL_AD_PROTOCOL_VERSION;
1276 goto f_err;
1277 } else if (s->client_version <= DTLS1_VERSION &&
1278 !(s->options & SSL_OP_NO_DTLSv1)) {
1279 s->version = DTLS1_VERSION;
1280 s->method = DTLSv1_server_method();
1281 } else {
f0659bdb 1282 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO,
b3e2272c
EK		 1283 SSL_R_WRONG_VERSION_NUMBER);
1284 s->version = s->client_version;
1285 al = SSL_AD_PROTOCOL_VERSION;
1286 goto f_err;
1287 }
1288 s->session->ssl_version = s->version;
32ec4153 1289 }
b3e2272c 1290 }
3ae91cfb 1291
38a3cbfb
EK		 1292 if (ssl_bytes_to_cipher_list(s, &cipher_suites, &(ciphers),
1293 is_v2_record, &al) == NULL) {
b3e2272c
EK		 1294 goto f_err;
1295 }
5e9f0eeb 1296
b3e2272c
EK		 1297 /* If it is a hit, check that the cipher is in the list */
1298 if (s->hit) {
1299 j = 0;
1300 id = s->session->cipher->id;
d02b48c6 1301
413c4f45 1302#ifdef CIPHER_DEBUG
b3e2272c
EK		 1303 fprintf(stderr, "client sent %d ciphers\n",
1304 sk_SSL_CIPHER_num(ciphers));
413c4f45 1305#endif
b3e2272c
EK		 1306 for (i = 0; i < sk_SSL_CIPHER_num(ciphers); i++) {
1307 c = sk_SSL_CIPHER_value(ciphers, i);
413c4f45 1308#ifdef CIPHER_DEBUG
b3e2272c
EK		 1309 fprintf(stderr, "client [%2d of %2d]:%s\n",
1310 i, sk_SSL_CIPHER_num(ciphers), SSL_CIPHER_get_name(c));
88f2a4cf 1311#endif
b3e2272c
EK		 1312 if (c->id == id) {
1313 j = 1;
1314 break;
32ec4153 1315 }
0f113f3e 1316 }
b3e2272c 1317 if (j == 0) {
ec30e856 1318 /*
b3e2272c
EK		 1319 * we need to have the cipher in the cipher list if we are asked
1320 * to reuse it
ec30e856 1321 */
b3e2272c 1322 al = SSL_AD_ILLEGAL_PARAMETER;
f0659bdb 1323 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO,
b3e2272c 1324 SSL_R_REQUIRED_CIPHER_MISSING);
32ec4153
MC		 1325 goto f_err;
1326 }
b3e2272c 1327 }
9ceb2426 1328
b3e2272c
EK		 1329 complen = PACKET_remaining(&compression);
1330 for (j = 0; j < complen; j++) {
1331 if (PACKET_data(&compression)[j] == 0)
1332 break;
0f113f3e 1333 }
32ec4153 1334
b3e2272c
EK		 1335 if (j >= complen) {
1336 /* no compress */
1337 al = SSL_AD_DECODE_ERROR;
f0659bdb 1338 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_NO_COMPRESSION_SPECIFIED);
b3e2272c
EK		 1339 goto f_err;
1340 }
1341
0f113f3e
MC		 1342 /* TLS extensions */
1343 if (s->version >= SSL3_VERSION) {
b3e2272c 1344 if (!ssl_parse_clienthello_tlsext(s, &extensions)) {
f0659bdb 1345 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_PARSE_TLSEXT);
0f113f3e
MC		 1346 goto err;
1347 }
1348 }
1349
1350 /*
1351 * Check if we want to use external pre-shared secret for this handshake
1352 * for not reused session only. We need to generate server_random before
1353 * calling tls_session_secret_cb in order to allow SessionTicket
1354 * processing to use it in key derivation.
1355 */
1356 {
1357 unsigned char *pos;
1358 pos = s->s3->server_random;
1359 if (ssl_fill_hello_random(s, 1, pos, SSL3_RANDOM_SIZE) <= 0) {
1360 goto f_err;
1361 }
1362 }
1363
1364 if (!s->hit && s->version >= TLS1_VERSION && s->tls_session_secret_cb) {
1365 SSL_CIPHER *pref_cipher = NULL;
1366
1367 s->session->master_key_length = sizeof(s->session->master_key);
1368 if (s->tls_session_secret_cb(s, s->session->master_key,
1369 &s->session->master_key_length, ciphers,
1370 &pref_cipher,
1371 s->tls_session_secret_cb_arg)) {
1372 s->hit = 1;
1373 s->session->ciphers = ciphers;
1374 s->session->verify_result = X509_V_OK;
1375
1376 ciphers = NULL;
1377
1378 /* check if some cipher was preferred by call back */
1379 pref_cipher =
1380 pref_cipher ? pref_cipher : ssl3_choose_cipher(s,
1381 s->
1382 session->ciphers,
1383 SSL_get_ciphers
1384 (s));
1385 if (pref_cipher == NULL) {
1386 al = SSL_AD_HANDSHAKE_FAILURE;
e27f234a 1387 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_NO_SHARED_CIPHER);
0f113f3e
MC		 1388 goto f_err;
1389 }
1390
1391 s->session->cipher = pref_cipher;
25aaa98a 1392 sk_SSL_CIPHER_free(s->cipher_list);
0f113f3e 1393 s->cipher_list = sk_SSL_CIPHER_dup(s->session->ciphers);
25aaa98a 1394 sk_SSL_CIPHER_free(s->cipher_list_by_id);
0f113f3e
MC		 1395 s->cipher_list_by_id = sk_SSL_CIPHER_dup(s->session->ciphers);
1396 }
1397 }
58ece833 1398
0f113f3e
MC		 1399 /*
1400 * Worst case, we will use the NULL compression, but if we have other
b2ce0337 1401 * options, we will now look for them. We have complen-1 compression
0f113f3e
MC		 1402 * algorithms from the client, starting at q.
1403 */
1404 s->s3->tmp.new_compression = NULL;
09b6c2ef 1405#ifndef OPENSSL_NO_COMP
0f113f3e
MC		 1406 /* This only happens if we have a cache hit */
1407 if (s->session->compress_meth != 0) {
1408 int m, comp_id = s->session->compress_meth;
9ceb2426 1409 unsigned int k;
0f113f3e
MC		 1410 /* Perform sanity checks on resumed compression algorithm */
1411 /* Can't disable compression */
1412 if (!ssl_allow_compression(s)) {
e27f234a 1413 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO,
0f113f3e
MC		 1414 SSL_R_INCONSISTENT_COMPRESSION);
1415 goto f_err;
1416 }
1417 /* Look for resumed compression method */
1418 for (m = 0; m < sk_SSL_COMP_num(s->ctx->comp_methods); m++) {
1419 comp = sk_SSL_COMP_value(s->ctx->comp_methods, m);
1420 if (comp_id == comp->id) {
1421 s->s3->tmp.new_compression = comp;
1422 break;
1423 }
1424 }
1425 if (s->s3->tmp.new_compression == NULL) {
e27f234a 1426 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO,
0f113f3e
MC		 1427 SSL_R_INVALID_COMPRESSION_ALGORITHM);
1428 goto f_err;
1429 }
1430 /* Look for resumed method in compression list */
9ceb2426 1431 for (k = 0; k < complen; k++) {
ec30e856 1432 if (PACKET_data(&compression)[k] == comp_id)
0f113f3e
MC		 1433 break;
1434 }
9ceb2426 1435 if (k >= complen) {
0f113f3e 1436 al = SSL_AD_ILLEGAL_PARAMETER;
e27f234a 1437 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO,
0f113f3e
MC		 1438 SSL_R_REQUIRED_COMPRESSSION_ALGORITHM_MISSING);
1439 goto f_err;
1440 }
1441 } else if (s->hit)
1442 comp = NULL;
1443 else if (ssl_allow_compression(s) && s->ctx->comp_methods) {
df6741c9 1444 /* See if we have a match */
9ceb2426
MC		 1445 int m, nn, v, done = 0;
1446 unsigned int o;
0f113f3e
MC		 1447
1448 nn = sk_SSL_COMP_num(s->ctx->comp_methods);
1449 for (m = 0; m < nn; m++) {
1450 comp = sk_SSL_COMP_value(s->ctx->comp_methods, m);
1451 v = comp->id;
b2ce0337 1452 for (o = 0; o < complen; o++) {
ec30e856 1453 if (v == PACKET_data(&compression)[o]) {
0f113f3e
MC		 1454 done = 1;
1455 break;
1456 }
1457 }
1458 if (done)
1459 break;
1460 }
1461 if (done)
1462 s->s3->tmp.new_compression = comp;
1463 else
1464 comp = NULL;
1465 }
e6f418bc 1466#else
0f113f3e
MC		 1467 /*
1468 * If compression is disabled we'd better not try to resume a session
1469 * using compression.
1470 */
1471 if (s->session->compress_meth != 0) {
e27f234a 1472 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_INCONSISTENT_COMPRESSION);
0f113f3e
MC		 1473 goto f_err;
1474 }
09b6c2ef 1475#endif
413c4f45 1476
0f113f3e
MC		 1477 /*
1478 * Given s->session->ciphers and SSL_get_ciphers, we must pick a cipher
1479 */
d02b48c6 1480
0f113f3e 1481 if (!s->hit) {
09b6c2ef 1482#ifdef OPENSSL_NO_COMP
0f113f3e 1483 s->session->compress_meth = 0;
09b6c2ef 1484#else
0f113f3e 1485 s->session->compress_meth = (comp == NULL) ? 0 : comp->id;
09b6c2ef 1486#endif
25aaa98a 1487 sk_SSL_CIPHER_free(s->session->ciphers);
0f113f3e
MC		 1488 s->session->ciphers = ciphers;
1489 if (ciphers == NULL) {
3ae91cfb 1490 al = SSL_AD_INTERNAL_ERROR;
e27f234a 1491 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
0f113f3e
MC		 1492 goto f_err;
1493 }
1494 ciphers = NULL;
1495 if (!tls1_set_server_sigalgs(s)) {
e27f234a 1496 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_CLIENTHELLO_TLSEXT);
0f113f3e
MC		 1497 goto err;
1498 }
e27f234a
MC		 1499 }
1500
1501 sk_SSL_CIPHER_free(ciphers);
1502 return MSG_PROCESS_CONTINUE_PROCESSING;
1503 f_err:
1504 ssl3_send_alert(s, SSL3_AL_FATAL, al);
1505 err:
fe3a3291 1506 ossl_statem_set_error(s);
e27f234a
MC		 1507
1508 sk_SSL_CIPHER_free(ciphers);
1509 return MSG_PROCESS_ERROR;
1510
1511}
1512
be3583fa 1513WORK_STATE tls_post_process_client_hello(SSL *s, WORK_STATE wst)
e27f234a 1514{
d13dd4be 1515 int al = SSL_AD_HANDSHAKE_FAILURE;
e27f234a
MC		 1516 SSL_CIPHER *cipher;
1517
1518 if (wst == WORK_MORE_A) {
1519 if (!s->hit) {
1520 /* Let cert callback update server certificates if required */
1521 if (s->cert->cert_cb) {
1522 int rv = s->cert->cert_cb(s, s->cert->cert_cb_arg);
1523 if (rv == 0) {
1524 al = SSL_AD_INTERNAL_ERROR;
1525 SSLerr(SSL_F_TLS_POST_PROCESS_CLIENT_HELLO, SSL_R_CERT_CB_ERROR);
1526 goto f_err;
1527 }
1528 if (rv < 0) {
1529 s->rwstate = SSL_X509_LOOKUP;
1530 return WORK_MORE_A;
1531 }
1532 s->rwstate = SSL_NOTHING;
0f113f3e 1533 }
e27f234a
MC		 1534 cipher = ssl3_choose_cipher(s, s->session->ciphers, SSL_get_ciphers(s));
1535
1536 if (cipher == NULL) {
e27f234a
MC		 1537 SSLerr(SSL_F_TLS_POST_PROCESS_CLIENT_HELLO, SSL_R_NO_SHARED_CIPHER);
1538 goto f_err;
0f113f3e 1539 }
e27f234a
MC		 1540 s->s3->tmp.new_cipher = cipher;
1541 /* check whether we should disable session resumption */
1542 if (s->not_resumable_session_cb != NULL)
1543 s->session->not_resumable = s->not_resumable_session_cb(s,
1544 ((cipher->algorithm_mkey & (SSL_kDHE | SSL_kECDHE)) != 0));
1545 if (s->session->not_resumable)
1546 /* do not send a session ticket */
1547 s->tlsext_ticket_expected = 0;
1548 } else {
1549 /* Session-id reuse */
1550 s->s3->tmp.new_cipher = s->session->cipher;
0f113f3e 1551 }
0f113f3e 1552
e27f234a 1553 if (!SSL_USE_SIGALGS(s) || !(s->verify_mode & SSL_VERIFY_PEER)) {
d13dd4be
MC		 1554 if (!ssl3_digest_cached_records(s, 0)) {
1555 al = SSL_AD_INTERNAL_ERROR;
e27f234a 1556 goto f_err;
d13dd4be 1557 }
0f113f3e 1558 }
0f113f3e 1559
e27f234a
MC		 1560 /*-
1561 * we now have the following setup.
1562 * client_random
1563 * cipher_list - our prefered list of ciphers
1564 * ciphers - the clients prefered list of ciphers
1565 * compression - basically ignored right now
1566 * ssl version is set - sslv3
1567 * s->session - The ssl session has been setup.
1568 * s->hit - session reuse flag
1569 * s->s3->tmp.new_cipher- the new cipher to use.
1570 */
0f113f3e 1571
e27f234a
MC		 1572 /* Handles TLS extensions that we couldn't check earlier */
1573 if (s->version >= SSL3_VERSION) {
1574 if (ssl_check_clienthello_tlsext_late(s) <= 0) {
d13dd4be
MC		 1575 SSLerr(SSL_F_TLS_POST_PROCESS_CLIENT_HELLO,
1576 SSL_R_CLIENTHELLO_TLSEXT);
e27f234a
MC		 1577 goto f_err;
1578 }
1579 }
0f113f3e 1580
e27f234a
MC		 1581 wst = WORK_MORE_B;
1582 }
1583#ifndef OPENSSL_NO_SRP
1584 if (wst == WORK_MORE_B) {
1585 int ret;
1586 if ((ret = ssl_check_srp_ext_ClientHello(s, &al)) < 0) {
1587 /*
1588 * callback indicates further work to be done
1589 */
1590 s->rwstate = SSL_X509_LOOKUP;
1591 return WORK_MORE_B;
1592 }
1593 if (ret != SSL_ERROR_NONE) {
1594 /*
1595 * This is not really an error but the only means to for
1596 * a client to detect whether srp is supported.
1597 */
1598 if (al != TLS1_AD_UNKNOWN_PSK_IDENTITY)
1599 SSLerr(SSL_F_TLS_POST_PROCESS_CLIENT_HELLO,
1600 SSL_R_CLIENTHELLO_TLSEXT);
1601 goto f_err;
0f113f3e
MC		 1602 }
1603 }
e27f234a
MC		 1604#endif
1605 s->renegotiate = 2;
0f113f3e 1606
e27f234a 1607 return WORK_FINISHED_STOP;
0f113f3e 1608 f_err:
e27f234a 1609 ssl3_send_alert(s, SSL3_AL_FATAL, al);
fe3a3291 1610 ossl_statem_set_error(s);
e27f234a
MC		 1611 return WORK_ERROR;
1612}
1613
e27f234a 1614int tls_construct_server_hello(SSL *s)
0f113f3e
MC		 1615{
1616 unsigned char *buf;
1617 unsigned char *p, *d;
1618 int i, sl;
1619 int al = 0;
1620 unsigned long l;
1621
e27f234a 1622 buf = (unsigned char *)s->init_buf->data;
e481f9b9 1623
e27f234a
MC		 1624 /* Do the message type and length last */
1625 d = p = ssl_handshake_start(s);
0f113f3e 1626
e27f234a
MC		 1627 *(p++) = s->version >> 8;
1628 *(p++) = s->version & 0xff;
0f113f3e 1629
e27f234a
MC		 1630 /*
1631 * Random stuff. Filling of the server_random takes place in
1632 * tls_process_client_hello()
1633 */
1634 memcpy(p, s->s3->server_random, SSL3_RANDOM_SIZE);
1635 p += SSL3_RANDOM_SIZE;
0f113f3e 1636
e27f234a
MC		 1637 /*-
1638 * There are several cases for the session ID to send
1639 * back in the server hello:
1640 * - For session reuse from the session cache,
1641 * we send back the old session ID.
1642 * - If stateless session reuse (using a session ticket)
1643 * is successful, we send back the client's "session ID"
1644 * (which doesn't actually identify the session).
1645 * - If it is a new session, we send back the new
1646 * session ID.
1647 * - However, if we want the new session to be single-use,
1648 * we send back a 0-length session ID.
1649 * s->hit is non-zero in either case of session reuse,
1650 * so the following won't overwrite an ID that we're supposed
1651 * to send back.
1652 */
1653 if (s->session->not_resumable ||
1654 (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER)
1655 && !s->hit))
1656 s->session->session_id_length = 0;
1657
1658 sl = s->session->session_id_length;
1659 if (sl > (int)sizeof(s->session->session_id)) {
1660 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
fe3a3291 1661 ossl_statem_set_error(s);
e27f234a
MC		 1662 return 0;
1663 }
1664 *(p++) = sl;
1665 memcpy(p, s->session->session_id, sl);
1666 p += sl;
0f113f3e 1667
e27f234a
MC		 1668 /* put the cipher */
1669 i = ssl3_put_cipher_by_char(s->s3->tmp.new_cipher, p);
1670 p += i;
0f113f3e 1671
e27f234a 1672 /* put the compression method */
09b6c2ef 1673#ifdef OPENSSL_NO_COMP
e27f234a 1674 *(p++) = 0;
09b6c2ef 1675#else
e27f234a
MC		 1676 if (s->s3->tmp.new_compression == NULL)
1677 *(p++) = 0;
1678 else
1679 *(p++) = s->s3->tmp.new_compression->id;
09b6c2ef 1680#endif
e481f9b9 1681
e27f234a
MC		 1682 if (ssl_prepare_serverhello_tlsext(s) <= 0) {
1683 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_HELLO, SSL_R_SERVERHELLO_TLSEXT);
fe3a3291 1684 ossl_statem_set_error(s);
e27f234a
MC		 1685 return 0;
1686 }
1687 if ((p =
1688 ssl_add_serverhello_tlsext(s, p, buf + SSL3_RT_MAX_PLAIN_LENGTH,
1689 &al)) == NULL) {
1690 ssl3_send_alert(s, SSL3_AL_FATAL, al);
1691 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
fe3a3291 1692 ossl_statem_set_error(s);
e27f234a
MC		 1693 return 0;
1694 }
e481f9b9 1695
e27f234a
MC		 1696 /* do the header */
1697 l = (p - d);
1698 if (!ssl_set_handshake_header(s, SSL3_MT_SERVER_HELLO, l)) {
1699 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
fe3a3291 1700 ossl_statem_set_error(s);
e27f234a 1701 return 0;
0f113f3e 1702 }
d02b48c6 1703
e27f234a 1704 return 1;
0f113f3e 1705}
d02b48c6 1706
e27f234a
MC		 1707int tls_construct_server_done(SSL *s)
1708{
1709 if (!ssl_set_handshake_header(s, SSL3_MT_SERVER_DONE, 0)) {
1710 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_DONE, ERR_R_INTERNAL_ERROR);
fe3a3291 1711 ossl_statem_set_error(s);
e27f234a
MC		 1712 return 0;
1713 }
1714
1715 if (!s->s3->tmp.cert_request) {
1716 if (!ssl3_digest_cached_records(s, 0)) {
fe3a3291 1717 ossl_statem_set_error(s);
e27f234a
MC		 1718 }
1719 }
1720
1721 return 1;
1722}
1723
e27f234a 1724int tls_construct_server_key_exchange(SSL *s)
0f113f3e 1725{
bc36ee62 1726#ifndef OPENSSL_NO_RSA
0f113f3e
MC		 1727 unsigned char *q;
1728 int j, num;
1729 RSA *rsa;
1730 unsigned char md_buf[MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH];
1731 unsigned int u;
d02b48c6 1732#endif
bc36ee62 1733#ifndef OPENSSL_NO_DH
0f113f3e 1734 DH *dh = NULL, *dhp;
ea262260 1735#endif
10bf4fc2 1736#ifndef OPENSSL_NO_EC
0f113f3e
MC		 1737 EC_KEY *ecdh = NULL, *ecdhp;
1738 unsigned char *encodedPoint = NULL;
1739 int encodedlen = 0;
1740 int curve_id = 0;
1741 BN_CTX *bn_ctx = NULL;
d02b48c6 1742#endif
0f113f3e
MC		 1743 EVP_PKEY *pkey;
1744 const EVP_MD *md = NULL;
1745 unsigned char *p, *d;
1746 int al, i;
1747 unsigned long type;
1748 int n;
1749 CERT *cert;
1750 BIGNUM *r[4];
1751 int nr[4], kn;
1752 BUF_MEM *buf;
1753 EVP_MD_CTX md_ctx;
1754
1755 EVP_MD_CTX_init(&md_ctx);
0f113f3e 1756
e27f234a
MC		 1757 type = s->s3->tmp.new_cipher->algorithm_mkey;
1758 cert = s->cert;
1759
1760 buf = s->init_buf;
0f113f3e 1761
e27f234a
MC		 1762 r[0] = r[1] = r[2] = r[3] = NULL;
1763 n = 0;
85269210 1764#ifndef OPENSSL_NO_PSK
e27f234a
MC		 1765 if (type & SSL_PSK) {
1766 /*
1767 * reserve size for record length and PSK identity hint
1768 */
1769 n += 2;
1770 if (s->cert->psk_identity_hint)
1771 n += strlen(s->cert->psk_identity_hint);
1772 }
1773 /* Plain PSK or RSAPSK nothing to do */
1774 if (type & (SSL_kPSK | SSL_kRSAPSK)) {
1775 } else
85269210 1776#endif /* !OPENSSL_NO_PSK */
bc36ee62 1777#ifndef OPENSSL_NO_RSA
e27f234a
MC		 1778 if (type & SSL_kRSA) {
1779 rsa = cert->rsa_tmp;
1780 if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL)) {
1781 rsa = s->cert->rsa_tmp_cb(s,
1782 SSL_C_IS_EXPORT(s->s3->
1783 tmp.new_cipher),
1784 SSL_C_EXPORT_PKEYLENGTH(s->s3->
1785 tmp.new_cipher));
0f113f3e
MC		 1786 if (rsa == NULL) {
1787 al = SSL_AD_HANDSHAKE_FAILURE;
e27f234a
MC		 1788 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
1789 SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
0f113f3e
MC		 1790 goto f_err;
1791 }
e27f234a
MC		 1792 RSA_up_ref(rsa);
1793 cert->rsa_tmp = rsa;
1794 }
1795 if (rsa == NULL) {
1796 al = SSL_AD_HANDSHAKE_FAILURE;
1797 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
1798 SSL_R_MISSING_TMP_RSA_KEY);
1799 goto f_err;
1800 }
1801 r[0] = rsa->n;
1802 r[1] = rsa->e;
1803 s->s3->tmp.use_rsa_tmp = 1;
1804 } else
d02b48c6 1805#endif
bc36ee62 1806#ifndef OPENSSL_NO_DH
e27f234a
MC		 1807 if (type & (SSL_kDHE | SSL_kDHEPSK)) {
1808 if (s->cert->dh_tmp_auto) {
1809 dhp = ssl_get_auto_dh(s);
0f113f3e 1810 if (dhp == NULL) {
e27f234a
MC		 1811 al = SSL_AD_INTERNAL_ERROR;
1812 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
0f113f3e 1813 ERR_R_INTERNAL_ERROR);
e27f234a 1814 goto f_err;
0f113f3e 1815 }
e27f234a
MC		 1816 } else
1817 dhp = cert->dh_tmp;
1818 if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
1819 dhp = s->cert->dh_tmp_cb(s,
1820 SSL_C_IS_EXPORT(s->s3->
1821 tmp.new_cipher),
1822 SSL_C_EXPORT_PKEYLENGTH(s->s3->
1823 tmp.new_cipher));
1824 if (dhp == NULL) {
1825 al = SSL_AD_HANDSHAKE_FAILURE;
1826 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
1827 SSL_R_MISSING_TMP_DH_KEY);
1828 goto f_err;
1829 }
1830 if (!ssl_security(s, SSL_SECOP_TMP_DH,
1831 DH_security_bits(dhp), 0, dhp)) {
1832 al = SSL_AD_HANDSHAKE_FAILURE;
1833 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
1834 SSL_R_DH_KEY_TOO_SMALL);
1835 goto f_err;
1836 }
1837 if (s->s3->tmp.dh != NULL) {
1838 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
1839 ERR_R_INTERNAL_ERROR);
1840 goto err;
1841 }
0f113f3e 1842
e27f234a
MC		 1843 if (s->cert->dh_tmp_auto)
1844 dh = dhp;
1845 else if ((dh = DHparams_dup(dhp)) == NULL) {
1846 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_R_DH_LIB);
1847 goto err;
1848 }
1849
1850 s->s3->tmp.dh = dh;
1851 if ((dhp->pub_key == NULL ||
1852 dhp->priv_key == NULL ||
1853 (s->options & SSL_OP_SINGLE_DH_USE))) {
1854 if (!DH_generate_key(dh)) {
1855 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_R_DH_LIB);
0f113f3e
MC		 1856 goto err;
1857 }
e27f234a
MC		 1858 } else {
1859 dh->pub_key = BN_dup(dhp->pub_key);
1860 dh->priv_key = BN_dup(dhp->priv_key);
1861 if ((dh->pub_key == NULL) || (dh->priv_key == NULL)) {
1862 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_R_DH_LIB);
1863 goto err;
0f113f3e 1864 }
e27f234a
MC		 1865 }
1866 r[0] = dh->p;
1867 r[1] = dh->g;
1868 r[2] = dh->pub_key;
1869 } else
d02b48c6 1870#endif
10bf4fc2 1871#ifndef OPENSSL_NO_EC
e27f234a
MC		 1872 if (type & (SSL_kECDHE | SSL_kECDHEPSK)) {
1873 const EC_GROUP *group;
0f113f3e 1874
e27f234a
MC		 1875 ecdhp = cert->ecdh_tmp;
1876 if (s->cert->ecdh_tmp_auto) {
1877 /* Get NID of appropriate shared curve */
1878 int nid = tls1_shared_curve(s, -2);
1879 if (nid != NID_undef)
1880 ecdhp = EC_KEY_new_by_curve_name(nid);
1881 } else if ((ecdhp == NULL) && s->cert->ecdh_tmp_cb) {
1882 ecdhp = s->cert->ecdh_tmp_cb(s,
1883 SSL_C_IS_EXPORT(s->s3->
1884 tmp.new_cipher),
1885 SSL_C_EXPORT_PKEYLENGTH(s->
1886 s3->tmp.new_cipher));
1887 }
1888 if (ecdhp == NULL) {
1889 al = SSL_AD_HANDSHAKE_FAILURE;
1890 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
1891 SSL_R_MISSING_TMP_ECDH_KEY);
1892 goto f_err;
1893 }
1894
1895 if (s->s3->tmp.ecdh != NULL) {
1896 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
1897 ERR_R_INTERNAL_ERROR);
1898 goto err;
1899 }
1900
1901 /* Duplicate the ECDH structure. */
1902 if (ecdhp == NULL) {
1903 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_R_ECDH_LIB);
1904 goto err;
1905 }
1906 if (s->cert->ecdh_tmp_auto)
1907 ecdh = ecdhp;
1908 else if ((ecdh = EC_KEY_dup(ecdhp)) == NULL) {
1909 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_R_ECDH_LIB);
1910 goto err;
1911 }
0f113f3e 1912
e27f234a
MC		 1913 s->s3->tmp.ecdh = ecdh;
1914 if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
1915 (EC_KEY_get0_private_key(ecdh) == NULL) ||
1916 (s->options & SSL_OP_SINGLE_ECDH_USE)) {
1917 if (!EC_KEY_generate_key(ecdh)) {
1918 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
1919 ERR_R_ECDH_LIB);
0f113f3e
MC		 1920 goto err;
1921 }
e27f234a 1922 }
0f113f3e 1923
e27f234a
MC		 1924 if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
1925 (EC_KEY_get0_public_key(ecdh) == NULL) ||
1926 (EC_KEY_get0_private_key(ecdh) == NULL)) {
1927 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_R_ECDH_LIB);
1928 goto err;
1929 }
0f113f3e 1930
e27f234a
MC		 1931 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1932 (EC_GROUP_get_degree(group) > 163)) {
1933 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
1934 SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1935 goto err;
1936 }
0f113f3e 1937
e27f234a
MC		 1938 /*
1939 * XXX: For now, we only support ephemeral ECDH keys over named
1940 * (not generic) curves. For supported named curves, curve_id is
1941 * non-zero.
1942 */
1943 if ((curve_id =
1944 tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group)))
1945 == 0) {
1946 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
1947 SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1948 goto err;
1949 }
0f113f3e 1950
e27f234a
MC		 1951 /*
1952 * Encode the public key. First check the size of encoding and
1953 * allocate memory accordingly.
1954 */
1955 encodedlen = EC_POINT_point2oct(group,
1956 EC_KEY_get0_public_key(ecdh),
1957 POINT_CONVERSION_UNCOMPRESSED,
1958 NULL, 0, NULL);
1959
1960 encodedPoint = (unsigned char *)
1961 OPENSSL_malloc(encodedlen * sizeof(unsigned char));
1962 bn_ctx = BN_CTX_new();
1963 if ((encodedPoint == NULL) || (bn_ctx == NULL)) {
1964 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
1965 ERR_R_MALLOC_FAILURE);
1966 goto err;
1967 }
0f113f3e 1968
e27f234a
MC		 1969 encodedlen = EC_POINT_point2oct(group,
1970 EC_KEY_get0_public_key(ecdh),
1971 POINT_CONVERSION_UNCOMPRESSED,
1972 encodedPoint, encodedlen, bn_ctx);
0f113f3e 1973
e27f234a
MC		 1974 if (encodedlen == 0) {
1975 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_R_ECDH_LIB);
1976 goto err;
1977 }
0f113f3e 1978
e27f234a
MC		 1979 BN_CTX_free(bn_ctx);
1980 bn_ctx = NULL;
0f113f3e 1981
e27f234a
MC		 1982 /*
1983 * XXX: For now, we only support named (not generic) curves in
1984 * ECDH ephemeral key exchanges. In this situation, we need four
1985 * additional bytes to encode the entire ServerECDHParams
1986 * structure.
1987 */
1988 n += 4 + encodedlen;
0f113f3e 1989
e27f234a
MC		 1990 /*
1991 * We'll generate the serverKeyExchange message explicitly so we
1992 * can set these to NULLs
1993 */
1994 r[0] = NULL;
1995 r[1] = NULL;
1996 r[2] = NULL;
1997 r[3] = NULL;
1998 } else
10bf4fc2 1999#endif /* !OPENSSL_NO_EC */
edc032b5 2000#ifndef OPENSSL_NO_SRP
e27f234a
MC		 2001 if (type & SSL_kSRP) {
2002 if ((s->srp_ctx.N == NULL) ||
2003 (s->srp_ctx.g == NULL) ||
2004 (s->srp_ctx.s == NULL) || (s->srp_ctx.B == NULL)) {
2005 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
2006 SSL_R_MISSING_SRP_PARAM);
2007 goto err;
0f113f3e 2008 }
e27f234a
MC		 2009 r[0] = s->srp_ctx.N;
2010 r[1] = s->srp_ctx.g;
2011 r[2] = s->srp_ctx.s;
2012 r[3] = s->srp_ctx.B;
2013 } else
2014#endif
2015 {
2016 al = SSL_AD_HANDSHAKE_FAILURE;
2017 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
2018 SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
2019 goto f_err;
2020 }
2021 for (i = 0; i < 4 && r[i] != NULL; i++) {
2022 nr[i] = BN_num_bytes(r[i]);
edc032b5 2023#ifndef OPENSSL_NO_SRP
e27f234a
MC		 2024 if ((i == 2) && (type & SSL_kSRP))
2025 n += 1 + nr[i];
2026 else
edc032b5 2027#endif
e27f234a
MC		 2028 n += 2 + nr[i];
2029 }
0f113f3e 2030
e27f234a
MC		 2031 if (!(s->s3->tmp.new_cipher->algorithm_auth & (SSL_aNULL|SSL_aSRP))
2032 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_PSK)) {
2033 if ((pkey = ssl_get_sign_pkey(s, s->s3->tmp.new_cipher, &md))
2034 == NULL) {
2035 al = SSL_AD_DECODE_ERROR;
2036 goto f_err;
0f113f3e 2037 }
e27f234a
MC		 2038 kn = EVP_PKEY_size(pkey);
2039 } else {
2040 pkey = NULL;
2041 kn = 0;
2042 }
0f113f3e 2043
e27f234a
MC		 2044 if (!BUF_MEM_grow_clean(buf, n + SSL_HM_HEADER_LENGTH(s) + kn)) {
2045 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_LIB_BUF);
2046 goto err;
2047 }
2048 d = p = ssl_handshake_start(s);
0f113f3e 2049
85269210 2050#ifndef OPENSSL_NO_PSK
e27f234a
MC		 2051 if (type & SSL_PSK) {
2052 /* copy PSK identity hint */
2053 if (s->cert->psk_identity_hint) {
2054 s2n(strlen(s->cert->psk_identity_hint), p);
2055 strncpy((char *)p, s->cert->psk_identity_hint,
2056 strlen(s->cert->psk_identity_hint));
2057 p += strlen(s->cert->psk_identity_hint);
2058 } else {
2059 s2n(0, p);
85269210 2060 }
e27f234a 2061 }
85269210
DSH		 2062#endif
2063
e27f234a 2064 for (i = 0; i < 4 && r[i] != NULL; i++) {
edc032b5 2065#ifndef OPENSSL_NO_SRP
e27f234a
MC		 2066 if ((i == 2) && (type & SSL_kSRP)) {
2067 *p = nr[i];
2068 p++;
2069 } else
edc032b5 2070#endif
e27f234a
MC		 2071 s2n(nr[i], p);
2072 BN_bn2bin(r[i], p);
2073 p += nr[i];
2074 }
d02b48c6 2075
10bf4fc2 2076#ifndef OPENSSL_NO_EC
e27f234a
MC		 2077 if (type & (SSL_kECDHE | SSL_kECDHEPSK)) {
2078 /*
2079 * XXX: For now, we only support named (not generic) curves. In
2080 * this situation, the serverKeyExchange message has: [1 byte
2081 * CurveType], [2 byte CurveName] [1 byte length of encoded
2082 * point], followed by the actual encoded point itself
2083 */
2084 *p = NAMED_CURVE_TYPE;
2085 p += 1;
2086 *p = 0;
2087 p += 1;
2088 *p = curve_id;
2089 p += 1;
2090 *p = encodedlen;
2091 p += 1;
2092 memcpy(p, encodedPoint, encodedlen);
2093 OPENSSL_free(encodedPoint);
2094 encodedPoint = NULL;
2095 p += encodedlen;
2096 }
ea262260
BM		 2097#endif
2098
e27f234a
MC		 2099 /* not anonymous */
2100 if (pkey != NULL) {
2101 /*
2102 * n is the length of the params, they start at &(d[4]) and p
2103 * points to the space at the end.
2104 */
bc36ee62 2105#ifndef OPENSSL_NO_RSA
e27f234a
MC		 2106 if (pkey->type == EVP_PKEY_RSA && !SSL_USE_SIGALGS(s)) {
2107 q = md_buf;
2108 j = 0;
2109 for (num = 2; num > 0; num--) {
2110 EVP_MD_CTX_set_flags(&md_ctx,
2111 EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
2112 EVP_DigestInit_ex(&md_ctx, (num == 2)
2113 ? s->ctx->md5 : s->ctx->sha1, NULL);
2114 EVP_DigestUpdate(&md_ctx, &(s->s3->client_random[0]),
2115 SSL3_RANDOM_SIZE);
2116 EVP_DigestUpdate(&md_ctx, &(s->s3->server_random[0]),
2117 SSL3_RANDOM_SIZE);
2118 EVP_DigestUpdate(&md_ctx, d, n);
2119 EVP_DigestFinal_ex(&md_ctx, q, (unsigned int *)&i);
2120 q += i;
2121 j += i;
2122 }
2123 if (RSA_sign(NID_md5_sha1, md_buf, j,
2124 &(p[2]), &u, pkey->pkey.rsa) <= 0) {
2125 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_LIB_RSA);
2126 goto err;
2127 }
2128 s2n(u, p);
2129 n += u + 2;
2130 } else
d02b48c6 2131#endif
e27f234a
MC		 2132 if (md) {
2133 /* send signature algorithm */
2134 if (SSL_USE_SIGALGS(s)) {
2135 if (!tls12_get_sigandhash(p, pkey, md)) {
2136 /* Should never happen */
2137 al = SSL_AD_INTERNAL_ERROR;
2138 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
2139 ERR_R_INTERNAL_ERROR);
2140 goto f_err;
0f113f3e 2141 }
e27f234a
MC		 2142 p += 2;
2143 }
a2f9200f 2144#ifdef SSL_DEBUG
e27f234a 2145 fprintf(stderr, "Using hash %s\n", EVP_MD_name(md));
a2f9200f 2146#endif
e27f234a
MC		 2147 EVP_SignInit_ex(&md_ctx, md, NULL);
2148 EVP_SignUpdate(&md_ctx, &(s->s3->client_random[0]),
2149 SSL3_RANDOM_SIZE);
2150 EVP_SignUpdate(&md_ctx, &(s->s3->server_random[0]),
2151 SSL3_RANDOM_SIZE);
2152 EVP_SignUpdate(&md_ctx, d, n);
2153 if (!EVP_SignFinal(&md_ctx, &(p[2]),
2154 (unsigned int *)&i, pkey)) {
2155 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_LIB_EVP);
2156 goto err;
0f113f3e 2157 }
e27f234a
MC		 2158 s2n(i, p);
2159 n += i + 2;
2160 if (SSL_USE_SIGALGS(s))
2161 n += 2;
2162 } else {
2163 /* Is this error check actually needed? */
77d514c5 2164 al = SSL_AD_HANDSHAKE_FAILURE;
e27f234a
MC		 2165 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
2166 SSL_R_UNKNOWN_PKEY_TYPE);
77d514c5
MC		 2167 goto f_err;
2168 }
0f113f3e
MC		 2169 }
2170
e27f234a
MC		 2171 if (!ssl_set_handshake_header(s, SSL3_MT_SERVER_KEY_EXCHANGE, n)) {
2172 al = SSL_AD_HANDSHAKE_FAILURE;
2173 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
2174 goto f_err;
2175 }
2176
0f113f3e 2177 EVP_MD_CTX_cleanup(&md_ctx);
e27f234a 2178 return 1;
0f113f3e
MC		 2179 f_err:
2180 ssl3_send_alert(s, SSL3_AL_FATAL, al);
2181 err:
556efe79 2182#ifndef OPENSSL_NO_EC
b548a1f1 2183 OPENSSL_free(encodedPoint);
0f113f3e 2184 BN_CTX_free(bn_ctx);
ea262260 2185#endif
0f113f3e 2186 EVP_MD_CTX_cleanup(&md_ctx);
fe3a3291 2187 ossl_statem_set_error(s);
e27f234a 2188 return 0;
0f113f3e 2189}
d02b48c6 2190
e27f234a 2191int tls_construct_certificate_request(SSL *s)
0f113f3e
MC		 2192{
2193 unsigned char *p, *d;
2194 int i, j, nl, off, n;
2195 STACK_OF(X509_NAME) *sk = NULL;
2196 X509_NAME *name;
2197 BUF_MEM *buf;
2198
e27f234a 2199 buf = s->init_buf;
0f113f3e 2200
e27f234a 2201 d = p = ssl_handshake_start(s);
0f113f3e 2202
e27f234a
MC		 2203 /* get the list of acceptable cert types */
2204 p++;
2205 n = ssl3_get_req_cert_type(s, p);
2206 d[0] = n;
2207 p += n;
2208 n++;
0f113f3e 2209
e27f234a
MC		 2210 if (SSL_USE_SIGALGS(s)) {
2211 const unsigned char *psigs;
2212 unsigned char *etmp = p;
2213 nl = tls12_get_psigalgs(s, &psigs);
2214 /* Skip over length for now */
0f113f3e 2215 p += 2;
e27f234a
MC		 2216 nl = tls12_copy_sigalgs(s, p, psigs, nl);
2217 /* Now fill in length */
2218 s2n(nl, etmp);
2219 p += nl;
2220 n += nl + 2;
2221 }
0f113f3e 2222
e27f234a
MC		 2223 off = n;
2224 p += 2;
2225 n += 2;
2226
2227 sk = SSL_get_client_CA_list(s);
2228 nl = 0;
2229 if (sk != NULL) {
2230 for (i = 0; i < sk_X509_NAME_num(sk); i++) {
2231 name = sk_X509_NAME_value(sk, i);
2232 j = i2d_X509_NAME(name, NULL);
2233 if (!BUF_MEM_grow_clean
2234 (buf, SSL_HM_HEADER_LENGTH(s) + n + j + 2)) {
2235 SSLerr(SSL_F_TLS_CONSTRUCT_CERTIFICATE_REQUEST,
2236 ERR_R_BUF_LIB);
2237 goto err;
0f113f3e 2238 }
e27f234a
MC		 2239 p = ssl_handshake_start(s) + n;
2240 s2n(j, p);
2241 i2d_X509_NAME(name, &p);
2242 n += 2 + j;
2243 nl += 2 + j;
0f113f3e 2244 }
e27f234a
MC		 2245 }
2246 /* else no CA names */
2247 p = ssl_handshake_start(s) + off;
2248 s2n(nl, p);
d02b48c6 2249
e27f234a
MC		 2250 if (!ssl_set_handshake_header(s, SSL3_MT_CERTIFICATE_REQUEST, n)) {
2251 SSLerr(SSL_F_TLS_CONSTRUCT_CERTIFICATE_REQUEST, ERR_R_INTERNAL_ERROR);
2252 goto err;
0f113f3e 2253 }
d02b48c6 2254
e27f234a
MC		 2255 s->s3->tmp.cert_request = 1;
2256
2257 return 1;
0f113f3e 2258 err:
fe3a3291 2259 ossl_statem_set_error(s);
e27f234a 2260 return 0;
0f113f3e 2261}
d02b48c6 2262
be3583fa 2263MSG_PROCESS_RETURN tls_process_client_key_exchange(SSL *s, PACKET *pkt)
e27f234a
MC		 2264{
2265 int al;
2266 unsigned int i;
0f113f3e 2267 unsigned long alg_k;
bc36ee62 2268#ifndef OPENSSL_NO_RSA
0f113f3e
MC		 2269 RSA *rsa = NULL;
2270 EVP_PKEY *pkey = NULL;
79df9d62 2271#endif
bc36ee62 2272#ifndef OPENSSL_NO_DH
0f113f3e
MC		 2273 BIGNUM *pub = NULL;
2274 DH *dh_srvr, *dh_clnt = NULL;
58964a49 2275#endif
556efe79 2276#ifndef OPENSSL_NO_EC
0f113f3e
MC		 2277 EC_KEY *srvr_ecdh = NULL;
2278 EVP_PKEY *clnt_pub_pkey = NULL;
2279 EC_POINT *clnt_ecpoint = NULL;
2280 BN_CTX *bn_ctx = NULL;
ea262260 2281#endif
73999b62 2282 PACKET enc_premaster;
20ca916d 2283 unsigned char *data, *rsa_decrypt = NULL;
ea262260 2284
0f113f3e 2285 alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
d02b48c6 2286
85269210
DSH		 2287#ifndef OPENSSL_NO_PSK
2288 /* For PSK parse and retrieve identity, obtain PSK key */
2289 if (alg_k & SSL_PSK) {
2290 unsigned char psk[PSK_MAX_PSK_LEN];
2291 size_t psklen;
73999b62 2292 PACKET psk_identity;
efcdbcbe 2293
73999b62 2294 if (!PACKET_get_length_prefixed_2(pkt, &psk_identity)) {
85269210 2295 al = SSL_AD_DECODE_ERROR;
e27f234a 2296 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, SSL_R_LENGTH_MISMATCH);
85269210
DSH		 2297 goto f_err;
2298 }
6d41fc80 2299 if (PACKET_remaining(&psk_identity) > PSK_MAX_IDENTITY_LEN) {
85269210 2300 al = SSL_AD_DECODE_ERROR;
e27f234a 2301 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE,
85269210
DSH		 2302 SSL_R_DATA_LENGTH_TOO_LONG);
2303 goto f_err;
2304 }
2305 if (s->psk_server_callback == NULL) {
2306 al = SSL_AD_INTERNAL_ERROR;
e27f234a 2307 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE,
85269210
DSH		 2308 SSL_R_PSK_NO_SERVER_CB);
2309 goto f_err;
2310 }
2311
6d41fc80 2312 if (!PACKET_strndup(&psk_identity, &s->session->psk_identity)) {
f0659bdb 2313 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
85269210 2314 al = SSL_AD_INTERNAL_ERROR;
efcdbcbe
MC		 2315 goto f_err;
2316 }
85269210
DSH		 2317
2318 psklen = s->psk_server_callback(s, s->session->psk_identity,
2319 psk, sizeof(psk));
2320
2321 if (psklen > PSK_MAX_PSK_LEN) {
2322 al = SSL_AD_INTERNAL_ERROR;
e27f234a 2323 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
85269210
DSH		 2324 goto f_err;
2325 } else if (psklen == 0) {
2326 /*
2327 * PSK related to the given identity not found
2328 */
e27f234a 2329 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE,
85269210
DSH		 2330 SSL_R_PSK_IDENTITY_NOT_FOUND);
2331 al = SSL_AD_UNKNOWN_PSK_IDENTITY;
2332 goto f_err;
2333 }
2334
2335 OPENSSL_free(s->s3->tmp.psk);
2336 s->s3->tmp.psk = BUF_memdup(psk, psklen);
2337 OPENSSL_cleanse(psk, psklen);
2338
2339 if (s->s3->tmp.psk == NULL) {
2340 al = SSL_AD_INTERNAL_ERROR;
e27f234a 2341 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
85269210
DSH		 2342 goto f_err;
2343 }
2344
2345 s->s3->tmp.psklen = psklen;
85269210
DSH		 2346 }
2347 if (alg_k & SSL_kPSK) {
2348 /* Identity extracted earlier: should be nothing left */
73999b62 2349 if (PACKET_remaining(pkt) != 0) {
85269210 2350 al = SSL_AD_HANDSHAKE_FAILURE;
e27f234a 2351 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, SSL_R_LENGTH_MISMATCH);
85269210
DSH		 2352 goto f_err;
2353 }
2354 /* PSK handled by ssl_generate_master_secret */
2355 if (!ssl_generate_master_secret(s, NULL, 0, 0)) {
2356 al = SSL_AD_INTERNAL_ERROR;
e27f234a 2357 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
85269210
DSH		 2358 goto f_err;
2359 }
2360 } else
2361#endif
bc36ee62 2362#ifndef OPENSSL_NO_RSA
85269210 2363 if (alg_k & (SSL_kRSA | SSL_kRSAPSK)) {
0f113f3e
MC		 2364 unsigned char rand_premaster_secret[SSL_MAX_MASTER_KEY_LENGTH];
2365 int decrypt_len;
2366 unsigned char decrypt_good, version_good;
2367 size_t j;
2368
2369 /* FIX THIS UP EAY EAY EAY EAY */
2370 if (s->s3->tmp.use_rsa_tmp) {
2371 if ((s->cert != NULL) && (s->cert->rsa_tmp != NULL))
2372 rsa = s->cert->rsa_tmp;
2373 /*
2374 * Don't do a callback because rsa_tmp should be sent already
2375 */
2376 if (rsa == NULL) {
2377 al = SSL_AD_HANDSHAKE_FAILURE;
e27f234a 2378 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE,
0f113f3e
MC		 2379 SSL_R_MISSING_TMP_RSA_PKEY);
2380 goto f_err;
2381
2382 }
2383 } else {
2384 pkey = s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
2385 if ((pkey == NULL) ||
2386 (pkey->type != EVP_PKEY_RSA) || (pkey->pkey.rsa == NULL)) {
2387 al = SSL_AD_HANDSHAKE_FAILURE;
e27f234a 2388 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE,
0f113f3e
MC		 2389 SSL_R_MISSING_RSA_CERTIFICATE);
2390 goto f_err;
2391 }
2392 rsa = pkey->pkey.rsa;
2393 }
2394
20ca916d
EK		 2395 /* SSLv3 and pre-standard DTLS omit the length bytes. */
2396 if (s->version == SSL3_VERSION || s->version == DTLS1_BAD_VER) {
73999b62 2397 enc_premaster = *pkt;
20ca916d 2398 } else {
73999b62
MC		 2399 PACKET orig = *pkt;
2400 if (!PACKET_get_length_prefixed_2(pkt, &enc_premaster)
2401 || PACKET_remaining(pkt) != 0) {
20ca916d
EK		 2402 /* Try SSLv3 behaviour for TLS. */
2403 if (s->options & SSL_OP_TLS_D5_BUG) {
2404 enc_premaster = orig;
2405 } else {
0f113f3e 2406 al = SSL_AD_DECODE_ERROR;
f0659bdb
MC		 2407 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE,
2408 SSL_R_LENGTH_MISMATCH);
0f113f3e 2409 goto f_err;
efcdbcbe
MC		 2410 }
2411 }
0f113f3e
MC		 2412 }
2413
2414 /*
20ca916d
EK		 2415 * We want to be sure that the plaintext buffer size makes it safe to
2416 * iterate over the entire size of a premaster secret
2417 * (SSL_MAX_MASTER_KEY_LENGTH). Reject overly short RSA keys because
2418 * their ciphertext cannot accommodate a premaster secret anyway.
0f113f3e 2419 */
20ca916d
EK		 2420 if (RSA_size(rsa) < SSL_MAX_MASTER_KEY_LENGTH) {
2421 al = SSL_AD_INTERNAL_ERROR;
f0659bdb 2422 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE,
20ca916d 2423 RSA_R_KEY_SIZE_TOO_SMALL);
0f113f3e
MC		 2424 goto f_err;
2425 }
2426
20ca916d
EK		 2427 rsa_decrypt = OPENSSL_malloc(RSA_size(rsa));
2428 if (rsa_decrypt == NULL) {
efcdbcbe 2429 al = SSL_AD_INTERNAL_ERROR;
f0659bdb 2430 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
efcdbcbe
MC		 2431 goto f_err;
2432 }
20ca916d 2433
0f113f3e
MC		 2434 /*
2435 * We must not leak whether a decryption failure occurs because of
2436 * Bleichenbacher's attack on PKCS #1 v1.5 RSA padding (see RFC 2246,
2437 * section 7.4.7.1). The code follows that advice of the TLS RFC and
2438 * generates a random premaster secret for the case that the decrypt
2439 * fails. See https://tools.ietf.org/html/rfc5246#section-7.4.7.1
2440 */
2441
266483d2 2442 if (RAND_bytes(rand_premaster_secret,
20ca916d 2443 sizeof(rand_premaster_secret)) <= 0) {
0f113f3e 2444 goto err;
20ca916d
EK		 2445 }
2446
2447 decrypt_len = RSA_private_decrypt(PACKET_remaining(&enc_premaster),
2448 PACKET_data(&enc_premaster),
2449 rsa_decrypt, rsa, RSA_PKCS1_PADDING);
0f113f3e
MC		 2450 ERR_clear_error();
2451
2452 /*
2453 * decrypt_len should be SSL_MAX_MASTER_KEY_LENGTH. decrypt_good will
2454 * be 0xff if so and zero otherwise.
2455 */
2456 decrypt_good =
2457 constant_time_eq_int_8(decrypt_len, SSL_MAX_MASTER_KEY_LENGTH);
2458
2459 /*
2460 * If the version in the decrypted pre-master secret is correct then
2461 * version_good will be 0xff, otherwise it'll be zero. The
2462 * Klima-Pokorny-Rosa extension of Bleichenbacher's attack
2463 * (http://eprint.iacr.org/2003/052/) exploits the version number
2464 * check as a "bad version oracle". Thus version checks are done in
2465 * constant time and are treated like any other decryption error.
2466 */
2467 version_good =
20ca916d
EK		 2468 constant_time_eq_8(rsa_decrypt[0],
2469 (unsigned)(s->client_version >> 8));
0f113f3e 2470 version_good &=
20ca916d
EK		 2471 constant_time_eq_8(rsa_decrypt[1],
2472 (unsigned)(s->client_version & 0xff));
0f113f3e
MC		 2473
2474 /*
2475 * The premaster secret must contain the same version number as the
2476 * ClientHello to detect version rollback attacks (strangely, the
2477 * protocol does not offer such protection for DH ciphersuites).
2478 * However, buggy clients exist that send the negotiated protocol
2479 * version instead if the server does not support the requested
2480 * protocol version. If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such
2481 * clients.
2482 */
2483 if (s->options & SSL_OP_TLS_ROLLBACK_BUG) {
2484 unsigned char workaround_good;
2485 workaround_good =
20ca916d 2486 constant_time_eq_8(rsa_decrypt[0], (unsigned)(s->version >> 8));
0f113f3e 2487 workaround_good &=
20ca916d
EK		 2488 constant_time_eq_8(rsa_decrypt[1],
2489 (unsigned)(s->version & 0xff));
0f113f3e
MC		 2490 version_good |= workaround_good;
2491 }
2492
2493 /*
2494 * Both decryption and version must be good for decrypt_good to
2495 * remain non-zero (0xff).
2496 */
2497 decrypt_good &= version_good;
2498
2499 /*
2500 * Now copy rand_premaster_secret over from p using
2501 * decrypt_good_mask. If decryption failed, then p does not
2502 * contain valid plaintext, however, a check above guarantees
2503 * it is still sufficiently large to read from.
2504 */
2505 for (j = 0; j < sizeof(rand_premaster_secret); j++) {
20ca916d
EK		 2506 rsa_decrypt[j] =
2507 constant_time_select_8(decrypt_good, rsa_decrypt[j],
2508 rand_premaster_secret[j]);
0f113f3e
MC		 2509 }
2510
20ca916d
EK		 2511 if (!ssl_generate_master_secret(s, rsa_decrypt,
2512 sizeof(rand_premaster_secret), 0)) {
69f68237 2513 al = SSL_AD_INTERNAL_ERROR;
e27f234a 2514 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
69f68237
MC		 2515 goto f_err;
2516 }
20ca916d
EK		 2517 OPENSSL_free(rsa_decrypt);
2518 rsa_decrypt = NULL;
0f113f3e 2519 } else
4c5fac4a 2520#endif
bc36ee62 2521#ifndef OPENSSL_NO_DH
85269210 2522 if (alg_k & (SSL_kDHE | SSL_kDHr | SSL_kDHd | SSL_kDHEPSK)) {
0f113f3e
MC		 2523 int idx = -1;
2524 EVP_PKEY *skey = NULL;
73999b62 2525 PACKET bookmark = *pkt;
efcdbcbe
MC		 2526 unsigned char shared[(OPENSSL_DH_MAX_MODULUS_BITS + 7) / 8];
2527
73999b62 2528 if (!PACKET_get_net_2(pkt, &i)) {
85269210 2529 if (alg_k & (SSL_kDHE | SSL_kDHEPSK)) {
d3cc5e61 2530 al = SSL_AD_HANDSHAKE_FAILURE;
e27f234a 2531 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE,
d3cc5e61
MC		 2532 SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
2533 goto f_err;
2534 }
0f113f3e 2535 i = 0;
d3cc5e61 2536 }
73999b62 2537 if (PACKET_remaining(pkt) != i) {
0f113f3e 2538 if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG)) {
e27f234a 2539 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE,
0f113f3e
MC		 2540 SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
2541 goto err;
2542 } else {
73999b62
MC		 2543 *pkt = bookmark;
2544 i = PACKET_remaining(pkt);
0f113f3e
MC		 2545 }
2546 }
2547 if (alg_k & SSL_kDHr)
2548 idx = SSL_PKEY_DH_RSA;
2549 else if (alg_k & SSL_kDHd)
2550 idx = SSL_PKEY_DH_DSA;
2551 if (idx >= 0) {
2552 skey = s->cert->pkeys[idx].privatekey;
2553 if ((skey == NULL) ||
2554 (skey->type != EVP_PKEY_DH) || (skey->pkey.dh == NULL)) {
2555 al = SSL_AD_HANDSHAKE_FAILURE;
e27f234a 2556 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE,
0f113f3e
MC		 2557 SSL_R_MISSING_RSA_CERTIFICATE);
2558 goto f_err;
2559 }
2560 dh_srvr = skey->pkey.dh;
2561 } else if (s->s3->tmp.dh == NULL) {
2562 al = SSL_AD_HANDSHAKE_FAILURE;
e27f234a 2563 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE,
0f113f3e
MC		 2564 SSL_R_MISSING_TMP_DH_KEY);
2565 goto f_err;
2566 } else
2567 dh_srvr = s->s3->tmp.dh;
2568
73999b62 2569 if (PACKET_remaining(pkt) == 0L) {
0f113f3e
MC		 2570 /* Get pubkey from cert */
2571 EVP_PKEY *clkey = X509_get_pubkey(s->session->peer);
2572 if (clkey) {
2573 if (EVP_PKEY_cmp_parameters(clkey, skey) == 1)
2574 dh_clnt = EVP_PKEY_get1_DH(clkey);
2575 }
2576 if (dh_clnt == NULL) {
2577 al = SSL_AD_HANDSHAKE_FAILURE;
e27f234a 2578 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE,
0f113f3e
MC		 2579 SSL_R_MISSING_TMP_DH_KEY);
2580 goto f_err;
2581 }
2582 EVP_PKEY_free(clkey);
2583 pub = dh_clnt->pub_key;
efcdbcbe 2584 } else {
73999b62 2585 if (!PACKET_get_bytes(pkt, &data, i)) {
efcdbcbe
MC		 2586 /* We already checked we have enough data */
2587 al = SSL_AD_INTERNAL_ERROR;
e27f234a 2588 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE,
efcdbcbe
MC		 2589 ERR_R_INTERNAL_ERROR);
2590 goto f_err;
2591 }
2592 pub = BN_bin2bn(data, i, NULL);
2593 }
0f113f3e 2594 if (pub == NULL) {
e27f234a 2595 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, SSL_R_BN_LIB);
0f113f3e
MC		 2596 goto err;
2597 }
2598
efcdbcbe 2599 i = DH_compute_key(shared, pub, dh_srvr);
0f113f3e
MC		 2600
2601 if (i <= 0) {
e27f234a 2602 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_DH_LIB);
0f113f3e
MC		 2603 BN_clear_free(pub);
2604 goto err;
2605 }
2606
2607 DH_free(s->s3->tmp.dh);
2608 s->s3->tmp.dh = NULL;
2609 if (dh_clnt)
2610 DH_free(dh_clnt);
2611 else
2612 BN_clear_free(pub);
2613 pub = NULL;
efcdbcbe 2614 if (!ssl_generate_master_secret(s, shared, i, 0)) {
69f68237 2615 al = SSL_AD_INTERNAL_ERROR;
e27f234a 2616 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
69f68237
MC		 2617 goto f_err;
2618 }
e27f234a 2619 if (dh_clnt) {
a71a4966 2620 s->statem.no_cert_verify = 1;
e27f234a
MC		 2621 return MSG_PROCESS_CONTINUE_PROCESSING;
2622 }
0f113f3e 2623 } else
d02b48c6 2624#endif
ea262260 2625
556efe79 2626#ifndef OPENSSL_NO_EC
85269210 2627 if (alg_k & (SSL_kECDHE | SSL_kECDHr | SSL_kECDHe | SSL_kECDHEPSK)) {
0f113f3e
MC		 2628 int field_size = 0;
2629 const EC_KEY *tkey;
2630 const EC_GROUP *group;
2631 const BIGNUM *priv_key;
efcdbcbe 2632 unsigned char *shared;
0f113f3e
MC		 2633
2634 /* initialize structures for server's ECDH key pair */
2635 if ((srvr_ecdh = EC_KEY_new()) == NULL) {
e27f234a 2636 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
0f113f3e
MC		 2637 goto err;
2638 }
2639
2640 /* Let's get server private key and group information */
2641 if (alg_k & (SSL_kECDHr | SSL_kECDHe)) {
2642 /* use the certificate */
2643 tkey = s->cert->pkeys[SSL_PKEY_ECC].privatekey->pkey.ec;
2644 } else {
2645 /*
2646 * use the ephermeral values we saved when generating the
2647 * ServerKeyExchange msg.
2648 */
2649 tkey = s->s3->tmp.ecdh;
2650 }
2651
2652 group = EC_KEY_get0_group(tkey);
2653 priv_key = EC_KEY_get0_private_key(tkey);
2654
2655 if (!EC_KEY_set_group(srvr_ecdh, group) ||
2656 !EC_KEY_set_private_key(srvr_ecdh, priv_key)) {
e27f234a 2657 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_EC_LIB);
0f113f3e
MC		 2658 goto err;
2659 }
2660
2661 /* Let's get client's public key */
2662 if ((clnt_ecpoint = EC_POINT_new(group)) == NULL) {
e27f234a 2663 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
0f113f3e
MC		 2664 goto err;
2665 }
2666
73999b62 2667 if (PACKET_remaining(pkt) == 0L) {
0f113f3e
MC		 2668 /* Client Publickey was in Client Certificate */
2669
85269210 2670 if (alg_k & (SSL_kECDHE | SSL_kECDHEPSK)) {
0f113f3e 2671 al = SSL_AD_HANDSHAKE_FAILURE;
e27f234a 2672 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE,
0f113f3e
MC		 2673 SSL_R_MISSING_TMP_ECDH_KEY);
2674 goto f_err;
2675 }
2676 if (((clnt_pub_pkey = X509_get_pubkey(s->session->peer))
2677 == NULL) || (clnt_pub_pkey->type != EVP_PKEY_EC)) {
2678 /*
2679 * XXX: For now, we do not support client authentication
2680 * using ECDH certificates so this branch (n == 0L) of the
2681 * code is never executed. When that support is added, we
2682 * ought to ensure the key received in the certificate is
2683 * authorized for key agreement. ECDH_compute_key implicitly
2684 * checks that the two ECDH shares are for the same group.
2685 */
2686 al = SSL_AD_HANDSHAKE_FAILURE;
e27f234a 2687 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE,
0f113f3e
MC		 2688 SSL_R_UNABLE_TO_DECODE_ECDH_CERTS);
2689 goto f_err;
2690 }
2691
2692 if (EC_POINT_copy(clnt_ecpoint,
2693 EC_KEY_get0_public_key(clnt_pub_pkey->
2694 pkey.ec)) == 0) {
e27f234a 2695 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_EC_LIB);
0f113f3e
MC		 2696 goto err;
2697 }
a71a4966 2698 s->statem.no_cert_verify = 1;
0f113f3e
MC		 2699 } else {
2700 /*
2701 * Get client's public key from encoded point in the
2702 * ClientKeyExchange message.
2703 */
2704 if ((bn_ctx = BN_CTX_new()) == NULL) {
e27f234a 2705 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE,
0f113f3e
MC		 2706 ERR_R_MALLOC_FAILURE);
2707 goto err;
2708 }
2709
2710 /* Get encoded point length */
73999b62 2711 if (!PACKET_get_1(pkt, &i)) {
efcdbcbe 2712 al = SSL_AD_DECODE_ERROR;
e27f234a 2713 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE,
efcdbcbe
MC		 2714 SSL_R_LENGTH_MISMATCH);
2715 goto f_err;
2716 }
73999b62
MC		 2717 if (!PACKET_get_bytes(pkt, &data, i)
2718 || PACKET_remaining(pkt) != 0) {
e27f234a 2719 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_EC_LIB);
0f113f3e
MC		 2720 goto err;
2721 }
efcdbcbe 2722 if (EC_POINT_oct2point(group, clnt_ecpoint, data, i, bn_ctx) == 0) {
e27f234a 2723 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_EC_LIB);
0f113f3e
MC		 2724 goto err;
2725 }
0f113f3e
MC		 2726 }
2727
2728 /* Compute the shared pre-master secret */
2729 field_size = EC_GROUP_get_degree(group);
2730 if (field_size <= 0) {
e27f234a 2731 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
0f113f3e
MC		 2732 goto err;
2733 }
efcdbcbe
MC		 2734 shared = OPENSSL_malloc((field_size + 7) / 8);
2735 if (shared == NULL) {
e27f234a 2736 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
efcdbcbe
MC		 2737 goto err;
2738 }
2739 i = ECDH_compute_key(shared, (field_size + 7) / 8, clnt_ecpoint,
2740 srvr_ecdh, NULL);
0f113f3e 2741 if (i <= 0) {
e27f234a 2742 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
efcdbcbe 2743 OPENSSL_free(shared);
0f113f3e
MC		 2744 goto err;
2745 }
2746
2747 EVP_PKEY_free(clnt_pub_pkey);
2748 EC_POINT_free(clnt_ecpoint);
2749 EC_KEY_free(srvr_ecdh);
2750 BN_CTX_free(bn_ctx);
2751 EC_KEY_free(s->s3->tmp.ecdh);
2752 s->s3->tmp.ecdh = NULL;
2753
efcdbcbe 2754 if (!ssl_generate_master_secret(s, shared, i, 1)) {
69f68237 2755 al = SSL_AD_INTERNAL_ERROR;
e27f234a 2756 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
69f68237
MC		 2757 goto f_err;
2758 }
e27f234a 2759 return MSG_PROCESS_CONTINUE_PROCESSING;
0f113f3e 2760 } else
ddac1974 2761#endif
edc032b5 2762#ifndef OPENSSL_NO_SRP
0f113f3e 2763 if (alg_k & SSL_kSRP) {
73999b62
MC		 2764 if (!PACKET_get_net_2(pkt, &i)
2765 || !PACKET_get_bytes(pkt, &data, i)) {
0f113f3e 2766 al = SSL_AD_DECODE_ERROR;
e27f234a 2767 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, SSL_R_BAD_SRP_A_LENGTH);
0f113f3e
MC		 2768 goto f_err;
2769 }
efcdbcbe 2770 if ((s->srp_ctx.A = BN_bin2bn(data, i, NULL)) == NULL) {
e27f234a 2771 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_BN_LIB);
0f113f3e
MC		 2772 goto err;
2773 }
2774 if (BN_ucmp(s->srp_ctx.A, s->srp_ctx.N) >= 0
2775 || BN_is_zero(s->srp_ctx.A)) {
2776 al = SSL_AD_ILLEGAL_PARAMETER;
e27f234a 2777 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE,
0f113f3e
MC		 2778 SSL_R_BAD_SRP_PARAMETERS);
2779 goto f_err;
2780 }
b548a1f1 2781 OPENSSL_free(s->session->srp_username);
0f113f3e
MC		 2782 s->session->srp_username = BUF_strdup(s->srp_ctx.login);
2783 if (s->session->srp_username == NULL) {
e27f234a 2784 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
0f113f3e
MC		 2785 goto err;
2786 }
2787
57b272b0 2788 if (!srp_generate_server_master_secret(s)) {
e27f234a 2789 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
0f113f3e
MC		 2790 goto err;
2791 }
0f113f3e
MC		 2792 } else
2793#endif /* OPENSSL_NO_SRP */
2794 if (alg_k & SSL_kGOST) {
0f113f3e
MC		 2795 EVP_PKEY_CTX *pkey_ctx;
2796 EVP_PKEY *client_pub_pkey = NULL, *pk = NULL;
2797 unsigned char premaster_secret[32], *start;
2798 size_t outlen = 32, inlen;
2799 unsigned long alg_a;
2800 int Ttag, Tclass;
2801 long Tlen;
73999b62 2802 long sess_key_len;
0f113f3e
MC		 2803
2804 /* Get our certificate private key */
2805 alg_a = s->s3->tmp.new_cipher->algorithm_auth;
ade44dcb 2806 if (alg_a & SSL_aGOST01)
0f113f3e
MC		 2807 pk = s->cert->pkeys[SSL_PKEY_GOST01].privatekey;
2808
2809 pkey_ctx = EVP_PKEY_CTX_new(pk, NULL);
2810 EVP_PKEY_decrypt_init(pkey_ctx);
2811 /*
2812 * If client certificate is present and is of the same type, maybe
2813 * use it for key exchange. Don't mind errors from
2814 * EVP_PKEY_derive_set_peer, because it is completely valid to use a
2815 * client certificate for authorization only.
2816 */
2817 client_pub_pkey = X509_get_pubkey(s->session->peer);
2818 if (client_pub_pkey) {
2819 if (EVP_PKEY_derive_set_peer(pkey_ctx, client_pub_pkey) <= 0)
2820 ERR_clear_error();
2821 }
2822 /* Decrypt session key */
73999b62
MC		 2823 sess_key_len = PACKET_remaining(pkt);
2824 if (!PACKET_get_bytes(pkt, &data, sess_key_len)) {
efcdbcbe 2825 al = SSL_AD_INTERNAL_ERROR;
e27f234a 2826 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
efcdbcbe
MC		 2827 goto f_err;
2828 }
73999b62
MC		 2829 if (ASN1_get_object ((const unsigned char **)&data, &Tlen, &Ttag,
2830 &Tclass, sess_key_len) != V_ASN1_CONSTRUCTED
2831 || Ttag != V_ASN1_SEQUENCE
0f113f3e 2832 || Tclass != V_ASN1_UNIVERSAL) {
e27f234a 2833 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE,
0f113f3e
MC		 2834 SSL_R_DECRYPTION_FAILED);
2835 goto gerr;
2836 }
efcdbcbe 2837 start = data;
0f113f3e
MC		 2838 inlen = Tlen;
2839 if (EVP_PKEY_decrypt
2840 (pkey_ctx, premaster_secret, &outlen, start, inlen) <= 0) {
e27f234a 2841 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE,
0f113f3e
MC		 2842 SSL_R_DECRYPTION_FAILED);
2843 goto gerr;
2844 }
2845 /* Generate master secret */
57b272b0
DSH		 2846 if (!ssl_generate_master_secret(s, premaster_secret,
2847 sizeof(premaster_secret), 0)) {
69f68237 2848 al = SSL_AD_INTERNAL_ERROR;
e27f234a 2849 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
69f68237
MC		 2850 goto f_err;
2851 }
0f113f3e
MC		 2852 /* Check if pubkey from client certificate was used */
2853 if (EVP_PKEY_CTX_ctrl
2854 (pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0)
a71a4966 2855 s->statem.no_cert_verify = 1;
e27f234a
MC		 2856
2857 EVP_PKEY_free(client_pub_pkey);
2858 EVP_PKEY_CTX_free(pkey_ctx);
2859 return MSG_PROCESS_CONTINUE_PROCESSING;
0f113f3e
MC		 2860 gerr:
2861 EVP_PKEY_free(client_pub_pkey);
2862 EVP_PKEY_CTX_free(pkey_ctx);
c5ba2d99 2863 goto err;
0f113f3e
MC		 2864 } else {
2865 al = SSL_AD_HANDSHAKE_FAILURE;
e27f234a 2866 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, SSL_R_UNKNOWN_CIPHER_TYPE);
0f113f3e
MC		 2867 goto f_err;
2868 }
2869
e27f234a 2870 return MSG_PROCESS_CONTINUE_PROCESSING;
0f113f3e
MC		 2871 f_err:
2872 ssl3_send_alert(s, SSL3_AL_FATAL, al);
556efe79 2873#if !defined(OPENSSL_NO_DH) || !defined(OPENSSL_NO_RSA) || !defined(OPENSSL_NO_EC) || defined(OPENSSL_NO_SRP)
0f113f3e 2874 err:
ea262260 2875#endif
556efe79 2876#ifndef OPENSSL_NO_EC
0f113f3e
MC		 2877 EVP_PKEY_free(clnt_pub_pkey);
2878 EC_POINT_free(clnt_ecpoint);
8fdc3734 2879 EC_KEY_free(srvr_ecdh);
0f113f3e 2880 BN_CTX_free(bn_ctx);
20ca916d 2881 OPENSSL_free(rsa_decrypt);
85269210
DSH		 2882#endif
2883#ifndef OPENSSL_NO_PSK
2884 OPENSSL_clear_free(s->s3->tmp.psk, s->s3->tmp.psklen);
2885 s->s3->tmp.psk = NULL;
58964a49 2886#endif
fe3a3291 2887 ossl_statem_set_error(s);
e27f234a 2888 return MSG_PROCESS_ERROR;
0f113f3e 2889}
d02b48c6 2890
be3583fa 2891WORK_STATE tls_post_process_client_key_exchange(SSL *s, WORK_STATE wst)
94836de2 2892{
94836de2 2893#ifndef OPENSSL_NO_SCTP
c130dd8e
MC		 2894 if (wst == WORK_MORE_A) {
2895 if (SSL_IS_DTLS(s)) {
2896 unsigned char sctpauthkey[64];
2897 char labelbuffer[sizeof(DTLS1_SCTP_AUTH_LABEL)];
2898 /*
2899 * Add new shared key for SCTP-Auth, will be ignored if no SCTP
2900 * used.
2901 */
141eb8c6
MC		 2902 memcpy(labelbuffer, DTLS1_SCTP_AUTH_LABEL,
2903 sizeof(DTLS1_SCTP_AUTH_LABEL));
c130dd8e
MC		 2904
2905 if (SSL_export_keying_material(s, sctpauthkey,
2906 sizeof(sctpauthkey), labelbuffer,
2907 sizeof(labelbuffer), NULL, 0, 0) <= 0) {
fe3a3291 2908 ossl_statem_set_error(s);
c130dd8e
MC		 2909 return WORK_ERROR;;
2910 }
94836de2 2911
c130dd8e
MC		 2912 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
2913 sizeof(sctpauthkey), sctpauthkey);
94836de2 2914 }
c130dd8e
MC		 2915 wst = WORK_MORE_B;
2916 }
94836de2 2917
c130dd8e
MC		 2918 if ((wst == WORK_MORE_B)
2919 /* Is this SCTP? */
2920 && BIO_dgram_is_sctp(SSL_get_wbio(s))
2921 /* Are we renegotiating? */
2922 && s->renegotiate
2923 /* Are we going to skip the CertificateVerify? */
a71a4966 2924 && (s->session->peer == NULL || s->statem.no_cert_verify)
c130dd8e
MC		 2925 && BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) {
2926 s->s3->in_read_app_data = 2;
2927 s->rwstate = SSL_READING;
2928 BIO_clear_retry_flags(SSL_get_rbio(s));
2929 BIO_set_retry_read(SSL_get_rbio(s));
2930 statem_set_sctp_read_sock(s, 1);
2931 return WORK_MORE_B;
2932 } else {
fe3a3291 2933 ossl_statem_set_sctp_read_sock(s, 0);
94836de2
MC		 2934 }
2935#endif
2936
a71a4966 2937 if (s->statem.no_cert_verify) {
94836de2
MC		 2938 /* No certificate verify so we no longer need the handshake_buffer */
2939 BIO_free(s->s3->handshake_buffer);
2940 return WORK_FINISHED_CONTINUE;
2941 } else if (SSL_USE_SIGALGS(s)) {
2942 if (!s->session->peer) {
2943 /* No peer certificate so we no longer need the handshake_buffer */
2944 BIO_free(s->s3->handshake_buffer);
2945 return WORK_FINISHED_CONTINUE;
2946 }
2947 if (!s->s3->handshake_buffer) {
2948 SSLerr(SSL_F_TLS_POST_PROCESS_CLIENT_KEY_EXCHANGE,
2949 ERR_R_INTERNAL_ERROR);
fe3a3291 2950 ossl_statem_set_error(s);
94836de2
MC		 2951 return WORK_ERROR;
2952 }
2953 /*
2954 * For sigalgs freeze the handshake buffer. If we support
2955 * extms we've done this already so this is a no-op
2956 */
2957 if (!ssl3_digest_cached_records(s, 1)) {
fe3a3291 2958 ossl_statem_set_error(s);
94836de2
MC		 2959 return WORK_ERROR;
2960 }
2961 } else {
2962 int offset = 0;
2963 int dgst_num;
2964
2965 /*
2966 * We need to get hashes here so if there is a client cert,
2967 * it can be verified FIXME - digest processing for
2968 * CertificateVerify should be generalized. But it is next
2969 * step
2970 */
2971 if (!ssl3_digest_cached_records(s, 0)) {
fe3a3291 2972 ossl_statem_set_error(s);
94836de2
MC		 2973 return WORK_ERROR;
2974 }
2975 for (dgst_num = 0; dgst_num < SSL_MAX_DIGEST; dgst_num++) {
2976 if (s->s3->handshake_dgst[dgst_num]) {
2977 int dgst_size;
2978
2979 s->method->ssl3_enc->cert_verify_mac(s,
2980 EVP_MD_CTX_type
2981 (s->
2982 s3->handshake_dgst
2983 [dgst_num]),
2984 &(s->s3->
2985 tmp.cert_verify_md
2986 [offset]));
2987 dgst_size =
2988 EVP_MD_CTX_size(s->s3->handshake_dgst[dgst_num]);
2989 if (dgst_size < 0) {
fe3a3291 2990 ossl_statem_set_error(s);
94836de2
MC		 2991 return WORK_ERROR;
2992 }
2993 offset += dgst_size;
2994 }
2995 }
2996 }
2997
2998 return WORK_FINISHED_CONTINUE;
2999}
3000
be3583fa 3001MSG_PROCESS_RETURN tls_process_cert_verify(SSL *s, PACKET *pkt)
e27f234a
MC		 3002{
3003 EVP_PKEY *pkey = NULL;
3004 unsigned char *sig, *data;
3005 int al, ret = MSG_PROCESS_ERROR;
3006 int type = 0, i, j;
3007 unsigned int len;
3008 X509 *peer;
3009 const EVP_MD *md = NULL;
3010 EVP_MD_CTX mctx;
e27f234a
MC		 3011 EVP_MD_CTX_init(&mctx);
3012
a0bd6493
MC		 3013 peer = s->session->peer;
3014 pkey = X509_get_pubkey(peer);
3015 type = X509_certificate_type(peer, pkey);
0f113f3e
MC		 3016
3017 if (!(type & EVP_PKT_SIGN)) {
e27f234a 3018 SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY,
0f113f3e
MC		 3019 SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
3020 al = SSL_AD_ILLEGAL_PARAMETER;
3021 goto f_err;
3022 }
3023
0f113f3e
MC		 3024 /* Check for broken implementations of GOST ciphersuites */
3025 /*
3026 * If key is GOST and n is exactly 64, it is bare signature without
3027 * length field
3028 */
73999b62 3029 if (PACKET_remaining(pkt) == 64 && pkey->type == NID_id_GostR3410_2001) {
f532a35d 3030 len = 64;
0f113f3e
MC		 3031 } else {
3032 if (SSL_USE_SIGALGS(s)) {
f532a35d
MC		 3033 int rv;
3034
73999b62 3035 if (!PACKET_get_bytes(pkt, &sig, 2)) {
f532a35d
MC		 3036 al = SSL_AD_DECODE_ERROR;
3037 goto f_err;
3038 }
3039 rv = tls12_check_peer_sigalg(&md, s, sig, pkey);
0f113f3e
MC		 3040 if (rv == -1) {
3041 al = SSL_AD_INTERNAL_ERROR;
3042 goto f_err;
3043 } else if (rv == 0) {
3044 al = SSL_AD_DECODE_ERROR;
3045 goto f_err;
3046 }
f37f20ff 3047#ifdef SSL_DEBUG
0f113f3e 3048 fprintf(stderr, "USING TLSv1.2 HASH %s\n", EVP_MD_name(md));
f37f20ff 3049#endif
0f113f3e 3050 }
73999b62 3051 if (!PACKET_get_net_2(pkt, &len)) {
e27f234a 3052 SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, SSL_R_LENGTH_MISMATCH);
0f113f3e
MC		 3053 al = SSL_AD_DECODE_ERROR;
3054 goto f_err;
3055 }
3056 }
3057 j = EVP_PKEY_size(pkey);
73999b62
MC		 3058 if (((int)len > j) || ((int)PACKET_remaining(pkt) > j)
3059 || (PACKET_remaining(pkt) == 0)) {
e27f234a 3060 SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, SSL_R_WRONG_SIGNATURE_SIZE);
0f113f3e
MC		 3061 al = SSL_AD_DECODE_ERROR;
3062 goto f_err;
3063 }
73999b62 3064 if (!PACKET_get_bytes(pkt, &data, len)) {
e27f234a 3065 SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, SSL_R_LENGTH_MISMATCH);
f532a35d
MC		 3066 al = SSL_AD_DECODE_ERROR;
3067 goto f_err;
3068 }
0f113f3e
MC		 3069
3070 if (SSL_USE_SIGALGS(s)) {
3071 long hdatalen = 0;
3072 void *hdata;
3073 hdatalen = BIO_get_mem_data(s->s3->handshake_buffer, &hdata);
3074 if (hdatalen <= 0) {
e27f234a 3075 SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, ERR_R_INTERNAL_ERROR);
0f113f3e
MC		 3076 al = SSL_AD_INTERNAL_ERROR;
3077 goto f_err;
3078 }
f37f20ff 3079#ifdef SSL_DEBUG
0f113f3e
MC		 3080 fprintf(stderr, "Using TLS 1.2 with client verify alg %s\n",
3081 EVP_MD_name(md));
f37f20ff 3082#endif
0f113f3e
MC		 3083 if (!EVP_VerifyInit_ex(&mctx, md, NULL)
3084 || !EVP_VerifyUpdate(&mctx, hdata, hdatalen)) {
e27f234a 3085 SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, ERR_R_EVP_LIB);
0f113f3e
MC		 3086 al = SSL_AD_INTERNAL_ERROR;
3087 goto f_err;
3088 }
3089
f532a35d 3090 if (EVP_VerifyFinal(&mctx, data, len, pkey) <= 0) {
0f113f3e 3091 al = SSL_AD_DECRYPT_ERROR;
e27f234a 3092 SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, SSL_R_BAD_SIGNATURE);
0f113f3e
MC		 3093 goto f_err;
3094 }
3095 } else
3096#ifndef OPENSSL_NO_RSA
3097 if (pkey->type == EVP_PKEY_RSA) {
3098 i = RSA_verify(NID_md5_sha1, s->s3->tmp.cert_verify_md,
f532a35d 3099 MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH, data, len,
0f113f3e
MC		 3100 pkey->pkey.rsa);
3101 if (i < 0) {
3102 al = SSL_AD_DECRYPT_ERROR;
e27f234a 3103 SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, SSL_R_BAD_RSA_DECRYPT);
0f113f3e
MC		 3104 goto f_err;
3105 }
3106 if (i == 0) {
3107 al = SSL_AD_DECRYPT_ERROR;
e27f234a 3108 SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, SSL_R_BAD_RSA_SIGNATURE);
0f113f3e
MC		 3109 goto f_err;
3110 }
3111 } else
d02b48c6 3112#endif
bc36ee62 3113#ifndef OPENSSL_NO_DSA
0f113f3e
MC		 3114 if (pkey->type == EVP_PKEY_DSA) {
3115 j = DSA_verify(pkey->save_type,
3116 &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
f532a35d 3117 SHA_DIGEST_LENGTH, data, len, pkey->pkey.dsa);
0f113f3e
MC		 3118 if (j <= 0) {
3119 /* bad signature */
3120 al = SSL_AD_DECRYPT_ERROR;
e27f234a 3121 SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, SSL_R_BAD_DSA_SIGNATURE);
0f113f3e
MC		 3122 goto f_err;
3123 }
3124 } else
ea262260 3125#endif
10bf4fc2 3126#ifndef OPENSSL_NO_EC
0f113f3e
MC		 3127 if (pkey->type == EVP_PKEY_EC) {
3128 j = ECDSA_verify(pkey->save_type,
3129 &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
f532a35d 3130 SHA_DIGEST_LENGTH, data, len, pkey->pkey.ec);
0f113f3e
MC		 3131 if (j <= 0) {
3132 /* bad signature */
3133 al = SSL_AD_DECRYPT_ERROR;
e27f234a 3134 SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, SSL_R_BAD_ECDSA_SIGNATURE);
0f113f3e
MC		 3135 goto f_err;
3136 }
3137 } else
d02b48c6 3138#endif
ade44dcb 3139 if (pkey->type == NID_id_GostR3410_2001) {
0f113f3e
MC		 3140 unsigned char signature[64];
3141 int idx;
3142 EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new(pkey, NULL);
3143 EVP_PKEY_verify_init(pctx);
f532a35d
MC		 3144 if (len != 64) {
3145 fprintf(stderr, "GOST signature length is %d", len);
0f113f3e
MC		 3146 }
3147 for (idx = 0; idx < 64; idx++) {
f532a35d 3148 signature[63 - idx] = data[idx];
0f113f3e
MC		 3149 }
3150 j = EVP_PKEY_verify(pctx, signature, 64, s->s3->tmp.cert_verify_md,
3151 32);
3152 EVP_PKEY_CTX_free(pctx);
3153 if (j <= 0) {
3154 al = SSL_AD_DECRYPT_ERROR;
e27f234a 3155 SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, SSL_R_BAD_ECDSA_SIGNATURE);
0f113f3e
MC		 3156 goto f_err;
3157 }
3158 } else {
e27f234a 3159 SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, ERR_R_INTERNAL_ERROR);
0f113f3e
MC		 3160 al = SSL_AD_UNSUPPORTED_CERTIFICATE;
3161 goto f_err;
3162 }
3163
c130dd8e 3164 ret = MSG_PROCESS_CONTINUE_PROCESSING;
0f113f3e
MC		 3165 if (0) {
3166 f_err:
3167 ssl3_send_alert(s, SSL3_AL_FATAL, al);
fe3a3291 3168 ossl_statem_set_error(s);
0f113f3e 3169 }
25aaa98a
RS		 3170 BIO_free(s->s3->handshake_buffer);
3171 s->s3->handshake_buffer = NULL;
0f113f3e
MC		 3172 EVP_MD_CTX_cleanup(&mctx);
3173 EVP_PKEY_free(pkey);
e27f234a 3174 return ret;
0f113f3e 3175}
d02b48c6 3176
be3583fa 3177MSG_PROCESS_RETURN tls_process_client_certificate(SSL *s, PACKET *pkt)
e27f234a 3178{
20dbe585 3179 int i, al = SSL_AD_INTERNAL_ERROR, ret = MSG_PROCESS_ERROR;
e27f234a
MC		 3180 X509 *x = NULL;
3181 unsigned long l, llen;
3182 const unsigned char *certstart;
3183 unsigned char *certbytes;
3184 STACK_OF(X509) *sk = NULL;
73999b62 3185 PACKET spkt;
0f113f3e
MC		 3186
3187 if ((sk = sk_X509_new_null()) == NULL) {
e27f234a
MC		 3188 SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE);
3189 goto f_err;
0f113f3e
MC		 3190 }
3191
73999b62
MC		 3192 if (!PACKET_get_net_3(pkt, &llen)
3193 || !PACKET_get_sub_packet(pkt, &spkt, llen)
3194 || PACKET_remaining(pkt) != 0) {
0f113f3e 3195 al = SSL_AD_DECODE_ERROR;
e27f234a 3196 SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, SSL_R_LENGTH_MISMATCH);
0f113f3e
MC		 3197 goto f_err;
3198 }
0bc09ecd
MC		 3199
3200 while (PACKET_remaining(&spkt) > 0) {
3201 if (!PACKET_get_net_3(&spkt, &l)
3202 || !PACKET_get_bytes(&spkt, &certbytes, l)) {
0f113f3e 3203 al = SSL_AD_DECODE_ERROR;
e27f234a 3204 SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE,
0f113f3e
MC		 3205 SSL_R_CERT_LENGTH_MISMATCH);
3206 goto f_err;
3207 }
3208
0bc09ecd
MC		 3209 certstart = certbytes;
3210 x = d2i_X509(NULL, (const unsigned char **)&certbytes, l);
0f113f3e 3211 if (x == NULL) {
e27f234a
MC		 3212 SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, ERR_R_ASN1_LIB);
3213 goto f_err;
0f113f3e 3214 }
0bc09ecd 3215 if (certbytes != (certstart + l)) {
0f113f3e 3216 al = SSL_AD_DECODE_ERROR;
e27f234a 3217 SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE,
0f113f3e
MC		 3218 SSL_R_CERT_LENGTH_MISMATCH);
3219 goto f_err;
3220 }
3221 if (!sk_X509_push(sk, x)) {
e27f234a
MC		 3222 SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE);
3223 goto f_err;
0f113f3e
MC		 3224 }
3225 x = NULL;
0f113f3e
MC		 3226 }
3227
3228 if (sk_X509_num(sk) <= 0) {
3229 /* TLS does not mind 0 certs returned */
3230 if (s->version == SSL3_VERSION) {
3231 al = SSL_AD_HANDSHAKE_FAILURE;
e27f234a 3232 SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE,
0f113f3e
MC		 3233 SSL_R_NO_CERTIFICATES_RETURNED);
3234 goto f_err;
3235 }
3236 /* Fail for TLS only if we required a certificate */
3237 else if ((s->verify_mode & SSL_VERIFY_PEER) &&
3238 (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) {
e27f234a 3239 SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE,
0f113f3e
MC		 3240 SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
3241 al = SSL_AD_HANDSHAKE_FAILURE;
3242 goto f_err;
3243 }
3244 /* No client certificate so digest cached records */
124037fd 3245 if (s->s3->handshake_buffer && !ssl3_digest_cached_records(s, 0)) {
0f113f3e
MC		 3246 goto f_err;
3247 }
3248 } else {
3249 EVP_PKEY *pkey;
3250 i = ssl_verify_cert_chain(s, sk);
3251 if (i <= 0) {
3252 al = ssl_verify_alarm_type(s->verify_result);
e27f234a 3253 SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE,
0f113f3e
MC		 3254 SSL_R_CERTIFICATE_VERIFY_FAILED);
3255 goto f_err;
3256 }
3257 if (i > 1) {
e27f234a 3258 SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, i);
0f113f3e
MC		 3259 al = SSL_AD_HANDSHAKE_FAILURE;
3260 goto f_err;
3261 }
3262 pkey = X509_get_pubkey(sk_X509_value(sk, 0));
3263 if (pkey == NULL) {
3264 al = SSL3_AD_HANDSHAKE_FAILURE;
e27f234a 3265 SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE,
0f113f3e
MC		 3266 SSL_R_UNKNOWN_CERTIFICATE_TYPE);
3267 goto f_err;
3268 }
3269 EVP_PKEY_free(pkey);
3270 }
3271
222561fe 3272 X509_free(s->session->peer);
0f113f3e
MC		 3273 s->session->peer = sk_X509_shift(sk);
3274 s->session->verify_result = s->verify_result;
3275
c34b0f99
DSH		 3276 sk_X509_pop_free(s->session->peer_chain, X509_free);
3277 s->session->peer_chain = sk;
0f113f3e
MC		 3278 /*
3279 * Inconsistency alert: cert_chain does *not* include the peer's own
3280 * certificate, while we do include it in s3_clnt.c
3281 */
0f113f3e 3282 sk = NULL;
e27f234a 3283 ret = MSG_PROCESS_CONTINUE_READING;
66696478
RS		 3284 goto done;
3285
0f113f3e 3286 f_err:
66696478 3287 ssl3_send_alert(s, SSL3_AL_FATAL, al);
fe3a3291 3288 ossl_statem_set_error(s);
66696478 3289 done:
222561fe
RS		 3290 X509_free(x);
3291 sk_X509_pop_free(sk, X509_free);
e27f234a 3292 return ret;
0f113f3e 3293}
d02b48c6 3294
e27f234a
MC		 3295int tls_construct_server_certificate(SSL *s)
3296{
3297 CERT_PKEY *cpk;
3298
3299 cpk = ssl_get_server_send_pkey(s);
3300 if (cpk == NULL) {
3301 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_CERTIFICATE, ERR_R_INTERNAL_ERROR);
fe3a3291 3302 ossl_statem_set_error(s);
e27f234a
MC		 3303 return 0;
3304 }
3305
3306 if (!ssl3_output_cert_chain(s, cpk)) {
3307 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_CERTIFICATE, ERR_R_INTERNAL_ERROR);
fe3a3291 3308 ossl_statem_set_error(s);
e27f234a
MC		 3309 return 0;
3310 }
3311
3312 return 1;
3313}
3314
e27f234a
MC		 3315int tls_construct_new_session_ticket(SSL *s)
3316{
3317 unsigned char *senc = NULL;
3318 EVP_CIPHER_CTX ctx;
3319 HMAC_CTX hctx;
3320 unsigned char *p, *macstart;
3321 const unsigned char *const_p;
3322 int len, slen_full, slen;
3323 SSL_SESSION *sess;
3324 unsigned int hlen;
3325 SSL_CTX *tctx = s->initial_ctx;
3326 unsigned char iv[EVP_MAX_IV_LENGTH];
3327 unsigned char key_name[16];
3328
3329 /* get session encoding length */
3330 slen_full = i2d_SSL_SESSION(s->session, NULL);
3331 /*
3332 * Some length values are 16 bits, so forget it if session is too
3333 * long
3334 */
3335 if (slen_full == 0 || slen_full > 0xFF00) {
fe3a3291 3336 ossl_statem_set_error(s);
e27f234a
MC		 3337 return 0;
3338 }
3339 senc = OPENSSL_malloc(slen_full);
3340 if (!senc) {
fe3a3291 3341 ossl_statem_set_error(s);
e27f234a
MC		 3342 return 0;
3343 }
0f113f3e 3344
e27f234a
MC		 3345 EVP_CIPHER_CTX_init(&ctx);
3346 HMAC_CTX_init(&hctx);
0f113f3e 3347
e27f234a
MC		 3348 p = senc;
3349 if (!i2d_SSL_SESSION(s->session, &p))
3350 goto err;
687eaf27 3351
e27f234a
MC		 3352 /*
3353 * create a fresh copy (not shared with other threads) to clean up
3354 */
3355 const_p = senc;
3356 sess = d2i_SSL_SESSION(NULL, &const_p, slen_full);
3357 if (sess == NULL)
3358 goto err;
3359 sess->session_id_length = 0; /* ID is irrelevant for the ticket */
0f113f3e 3360
e27f234a
MC		 3361 slen = i2d_SSL_SESSION(sess, NULL);
3362 if (slen == 0 || slen > slen_full) { /* shouldn't ever happen */
3363 SSL_SESSION_free(sess);
3364 goto err;
3365 }
3366 p = senc;
3367 if (!i2d_SSL_SESSION(sess, &p)) {
3368 SSL_SESSION_free(sess);
3369 goto err;
3370 }
3371 SSL_SESSION_free(sess);
0f113f3e 3372
e27f234a
MC		 3373 /*-
3374 * Grow buffer if need be: the length calculation is as
3375 * follows handshake_header_length +
3376 * 4 (ticket lifetime hint) + 2 (ticket length) +
3377 * 16 (key name) + max_iv_len (iv length) +
3378 * session_length + max_enc_block_size (max encrypted session
3379 * length) + max_md_size (HMAC).
3380 */
3381 if (!BUF_MEM_grow(s->init_buf,
3382 SSL_HM_HEADER_LENGTH(s) + 22 + EVP_MAX_IV_LENGTH +
3383 EVP_MAX_BLOCK_LENGTH + EVP_MAX_MD_SIZE + slen))
3384 goto err;
0f113f3e 3385
e27f234a
MC		 3386 p = ssl_handshake_start(s);
3387 /*
3388 * Initialize HMAC and cipher contexts. If callback present it does
3389 * all the work otherwise use generated values from parent ctx.
3390 */
3391 if (tctx->tlsext_ticket_key_cb) {
3392 if (tctx->tlsext_ticket_key_cb(s, key_name, iv, &ctx,
3393 &hctx, 1) < 0)
3394 goto err;
3395 } else {
3396 if (RAND_bytes(iv, 16) <= 0)
687eaf27 3397 goto err;
e27f234a
MC		 3398 if (!EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
3399 tctx->tlsext_tick_aes_key, iv))
687eaf27 3400 goto err;
e27f234a
MC		 3401 if (!HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
3402 EVP_sha256(), NULL))
4f9fab6b 3403 goto err;
e27f234a 3404 memcpy(key_name, tctx->tlsext_tick_key_name, 16);
0f113f3e
MC		 3405 }
3406
e27f234a
MC		 3407 /*
3408 * Ticket lifetime hint (advisory only): We leave this unspecified
3409 * for resumed session (for simplicity), and guess that tickets for
3410 * new sessions will live as long as their sessions.
3411 */
3412 l2n(s->hit ? 0 : s->session->timeout, p);
3413
3414 /* Skip ticket length for now */
3415 p += 2;
3416 /* Output key name */
3417 macstart = p;
3418 memcpy(p, key_name, 16);
3419 p += 16;
3420 /* output IV */
3421 memcpy(p, iv, EVP_CIPHER_CTX_iv_length(&ctx));
3422 p += EVP_CIPHER_CTX_iv_length(&ctx);
3423 /* Encrypt session data */
3424 if (!EVP_EncryptUpdate(&ctx, p, &len, senc, slen))
3425 goto err;
3426 p += len;
3427 if (!EVP_EncryptFinal(&ctx, p, &len))
3428 goto err;
3429 p += len;
3430
3431 if (!HMAC_Update(&hctx, macstart, p - macstart))
3432 goto err;
3433 if (!HMAC_Final(&hctx, p, &hlen))
3434 goto err;
3435
3436 EVP_CIPHER_CTX_cleanup(&ctx);
3437 HMAC_CTX_cleanup(&hctx);
3438
3439 p += hlen;
3440 /* Now write out lengths: p points to end of data written */
3441 /* Total length */
3442 len = p - ssl_handshake_start(s);
3443 /* Skip ticket lifetime hint */
3444 p = ssl_handshake_start(s) + 4;
3445 s2n(len - 6, p);
3446 if (!ssl_set_handshake_header(s, SSL3_MT_NEWSESSION_TICKET, len))
3447 goto err;
3448 OPENSSL_free(senc);
3449
3450 return 1;
687eaf27 3451 err:
b548a1f1 3452 OPENSSL_free(senc);
687eaf27
MC		 3453 EVP_CIPHER_CTX_cleanup(&ctx);
3454 HMAC_CTX_cleanup(&hctx);
fe3a3291 3455 ossl_statem_set_error(s);
e27f234a 3456 return 0;
0f113f3e 3457}
67c8e7f4 3458
e27f234a
MC		 3459int tls_construct_cert_status(SSL *s)
3460{
3461 unsigned char *p;
3462 /*-
3463 * Grow buffer if need be: the length calculation is as
3464 * follows 1 (message type) + 3 (message length) +
3465 * 1 (ocsp response type) + 3 (ocsp response length)
3466 * + (ocsp response)
3467 */
3468 if (!BUF_MEM_grow(s->init_buf, 8 + s->tlsext_ocsp_resplen)) {
fe3a3291 3469 ossl_statem_set_error(s);
e27f234a
MC		 3470 return 0;
3471 }
3472
3473 p = (unsigned char *)s->init_buf->data;
3474
3475 /* do the header */
3476 *(p++) = SSL3_MT_CERTIFICATE_STATUS;
3477 /* message length */
3478 l2n3(s->tlsext_ocsp_resplen + 4, p);
3479 /* status type */
3480 *(p++) = s->tlsext_status_type;
3481 /* length of OCSP response */
3482 l2n3(s->tlsext_ocsp_resplen, p);
3483 /* actual response */
3484 memcpy(p, s->tlsext_ocsp_resp, s->tlsext_ocsp_resplen);
3485 /* number of bytes to write */
3486 s->init_num = 8 + s->tlsext_ocsp_resplen;
3487 s->init_off = 0;
3488
3489 return 1;
3490}
3491
e481f9b9 3492#ifndef OPENSSL_NO_NEXTPROTONEG
e27f234a
MC		 3493/*
3494 * tls_process_next_proto reads a Next Protocol Negotiation handshake message.
3495 * It sets the next_proto member in s if found
3496 */
be3583fa 3497MSG_PROCESS_RETURN tls_process_next_proto(SSL *s, PACKET *pkt)
e27f234a 3498{
73999b62 3499 PACKET next_proto, padding;
e27f234a
MC		 3500 size_t next_proto_len;
3501
50e735f9
MC		 3502 /*-
3503 * The payload looks like:
3504 * uint8 proto_len;
3505 * uint8 proto[proto_len];
3506 * uint8 padding_len;
3507 * uint8 padding[padding_len];
3508 */
73999b62
MC		 3509 if (!PACKET_get_length_prefixed_1(pkt, &next_proto)
3510 || !PACKET_get_length_prefixed_1(pkt, &padding)
3511 || PACKET_remaining(pkt) > 0) {
e27f234a 3512 SSLerr(SSL_F_TLS_PROCESS_NEXT_PROTO, SSL_R_LENGTH_MISMATCH);
c3fc7eea 3513 goto err;
cf9b0b6f 3514 }
0f113f3e 3515
6d41fc80
EK		 3516 if (!PACKET_memdup(&next_proto, &s->next_proto_negotiated,
3517 &next_proto_len)) {
3518 s->next_proto_negotiated_len = 0;
c3fc7eea
MC		 3519 goto err;
3520 }
3521
6d41fc80 3522 s->next_proto_negotiated_len = (unsigned char)next_proto_len;
0f113f3e 3523
e27f234a 3524 return MSG_PROCESS_CONTINUE_READING;
c3fc7eea 3525err:
fe3a3291 3526 ossl_statem_set_error(s);
e27f234a 3527 return MSG_PROCESS_ERROR;
0f113f3e 3528}
6434abbf 3529#endif
d45ba43d
MC		 3530
3531#define SSLV2_CIPHER_LEN 3
3532
38a3cbfb
EK		 3533STACK_OF(SSL_CIPHER) *ssl_bytes_to_cipher_list(SSL *s,
3534 PACKET *cipher_suites,
d45ba43d 3535 STACK_OF(SSL_CIPHER) **skp,
38a3cbfb
EK		 3536 int sslv2format, int *al
3537 )
d45ba43d
MC		 3538{
3539 const SSL_CIPHER *c;
3540 STACK_OF(SSL_CIPHER) *sk;
38a3cbfb
EK		 3541 int n;
3542 /* 3 = SSLV2_CIPHER_LEN > TLS_CIPHER_LEN = 2. */
3543 unsigned char cipher[SSLV2_CIPHER_LEN];
d45ba43d 3544
38a3cbfb
EK		 3545 s->s3->send_connection_binding = 0;
3546
3547 n = sslv2format ? SSLV2_CIPHER_LEN : TLS_CIPHER_LEN;
3548
3549 if (PACKET_remaining(cipher_suites) == 0) {
3550 SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST, SSL_R_NO_CIPHERS_SPECIFIED);
3551 *al = SSL_AD_ILLEGAL_PARAMETER;
3552 return NULL;
d45ba43d 3553 }
38a3cbfb
EK		 3554
3555 if (PACKET_remaining(cipher_suites) % n != 0) {
d45ba43d
MC		 3556 SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST,
3557 SSL_R_ERROR_IN_RECEIVED_CIPHER_LIST);
38a3cbfb
EK		 3558 *al = SSL_AD_DECODE_ERROR;
3559 return NULL;
d45ba43d 3560 }
38a3cbfb 3561
d45ba43d
MC		 3562 if ((skp == NULL) || (*skp == NULL)) {
3563 sk = sk_SSL_CIPHER_new_null(); /* change perhaps later */
3564 if(sk == NULL) {
3565 SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST, ERR_R_MALLOC_FAILURE);
38a3cbfb 3566 *al = SSL_AD_INTERNAL_ERROR;
d45ba43d
MC		 3567 return NULL;
3568 }
3569 } else {
3570 sk = *skp;
3571 sk_SSL_CIPHER_zero(sk);
3572 }
3573
38a3cbfb
EK		 3574 if (!PACKET_memdup(cipher_suites, &s->s3->tmp.ciphers_raw,
3575 &s->s3->tmp.ciphers_rawlen)) {
3576 *al = SSL_AD_INTERNAL_ERROR;
d45ba43d
MC		 3577 goto err;
3578 }
d45ba43d 3579
38a3cbfb
EK		 3580 while (PACKET_copy_bytes(cipher_suites, cipher, n)) {
3581 /*
20218b58
EK		 3582 * SSLv3 ciphers wrapped in an SSLv2-compatible ClientHello have the
3583 * first byte set to zero, while true SSLv2 ciphers have a non-zero
3584 * first byte. We don't support any true SSLv2 ciphers, so skip them.
38a3cbfb
EK		 3585 */
3586 if (sslv2format && cipher[0] != '\0')
3587 continue;
3588
d45ba43d 3589 /* Check for TLS_EMPTY_RENEGOTIATION_INFO_SCSV */
38a3cbfb
EK		 3590 if ((cipher[n - 2] == ((SSL3_CK_SCSV >> 8) & 0xff)) &&
3591 (cipher[n - 1] == (SSL3_CK_SCSV & 0xff))) {
d45ba43d
MC		 3592 /* SCSV fatal if renegotiating */
3593 if (s->renegotiate) {
3594 SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST,
3595 SSL_R_SCSV_RECEIVED_WHEN_RENEGOTIATING);
38a3cbfb 3596 *al = SSL_AD_HANDSHAKE_FAILURE;
d45ba43d
MC		 3597 goto err;
3598 }
3599 s->s3->send_connection_binding = 1;
d45ba43d
MC		 3600#ifdef OPENSSL_RI_DEBUG
3601 fprintf(stderr, "SCSV received by server\n");
3602#endif
3603 continue;
3604 }
3605
3606 /* Check for TLS_FALLBACK_SCSV */
38a3cbfb
EK		 3607 if ((cipher[n - 2] == ((SSL3_CK_FALLBACK_SCSV >> 8) & 0xff)) &&
3608 (cipher[n - 1] == (SSL3_CK_FALLBACK_SCSV & 0xff))) {
d45ba43d
MC		 3609 /*
3610 * The SCSV indicates that the client previously tried a higher
3611 * version. Fail if the current version is an unexpected
3612 * downgrade.
3613 */
3614 if (!SSL_ctrl(s, SSL_CTRL_CHECK_PROTO_VERSION, 0, NULL)) {
3615 SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST,
3616 SSL_R_INAPPROPRIATE_FALLBACK);
38a3cbfb 3617 *al = SSL_AD_INAPPROPRIATE_FALLBACK;
d45ba43d
MC		 3618 goto err;
3619 }
d45ba43d
MC		 3620 continue;
3621 }
3622
38a3cbfb
EK		 3623 /* For SSLv2-compat, ignore leading 0-byte. */
3624 c = ssl_get_cipher_by_char(s, sslv2format ? &cipher[1] : cipher);
d45ba43d
MC		 3625 if (c != NULL) {
3626 if (!sk_SSL_CIPHER_push(sk, c)) {
3627 SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST, ERR_R_MALLOC_FAILURE);
38a3cbfb 3628 *al = SSL_AD_INTERNAL_ERROR;
d45ba43d
MC		 3629 goto err;
3630 }
3631 }
3632 }
38a3cbfb
EK		 3633 if (PACKET_remaining(cipher_suites) > 0) {
3634 *al = SSL_AD_INTERNAL_ERROR;
3635 SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST, ERR_R_INTERNAL_ERROR);
3636 goto err;
3637 }
d45ba43d
MC		 3638
3639 if (skp != NULL)
3640 *skp = sk;
3641 return (sk);
3642 err:
3643 if ((skp == NULL) || (*skp == NULL))
3644 sk_SSL_CIPHER_free(sk);
38a3cbfb 3645 return NULL;
d45ba43d 3646}
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