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Patch containing TLS implementation for GOST 2012
[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));
d99b0691 871 ossl_statem_set_sctp_read_sock(s, 1);
61ae935a
MC		 872 return WORK_MORE_A;
873 } else {
d99b0691 874 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
e44380a9
DB		 1553 if (!(SSL_USE_SIGALGS(s) || (s->s3->tmp.new_cipher->algorithm_auth & (SSL_aGOST12|SSL_aGOST01)) )
1554 || !(s->verify_mode & SSL_VERIFY_PEER)) {
d13dd4be
MC		 1555 if (!ssl3_digest_cached_records(s, 0)) {
1556 al = SSL_AD_INTERNAL_ERROR;
e27f234a 1557 goto f_err;
d13dd4be 1558 }
0f113f3e 1559 }
0f113f3e 1560
e27f234a
MC		 1561 /*-
1562 * we now have the following setup.
1563 * client_random
1564 * cipher_list - our prefered list of ciphers
1565 * ciphers - the clients prefered list of ciphers
1566 * compression - basically ignored right now
1567 * ssl version is set - sslv3
1568 * s->session - The ssl session has been setup.
1569 * s->hit - session reuse flag
1570 * s->s3->tmp.new_cipher- the new cipher to use.
1571 */
0f113f3e 1572
e27f234a
MC		 1573 /* Handles TLS extensions that we couldn't check earlier */
1574 if (s->version >= SSL3_VERSION) {
1575 if (ssl_check_clienthello_tlsext_late(s) <= 0) {
d13dd4be
MC		 1576 SSLerr(SSL_F_TLS_POST_PROCESS_CLIENT_HELLO,
1577 SSL_R_CLIENTHELLO_TLSEXT);
e27f234a
MC		 1578 goto f_err;
1579 }
1580 }
0f113f3e 1581
e27f234a
MC		 1582 wst = WORK_MORE_B;
1583 }
1584#ifndef OPENSSL_NO_SRP
1585 if (wst == WORK_MORE_B) {
1586 int ret;
1587 if ((ret = ssl_check_srp_ext_ClientHello(s, &al)) < 0) {
1588 /*
1589 * callback indicates further work to be done
1590 */
1591 s->rwstate = SSL_X509_LOOKUP;
1592 return WORK_MORE_B;
1593 }
1594 if (ret != SSL_ERROR_NONE) {
1595 /*
1596 * This is not really an error but the only means to for
1597 * a client to detect whether srp is supported.
1598 */
1599 if (al != TLS1_AD_UNKNOWN_PSK_IDENTITY)
1600 SSLerr(SSL_F_TLS_POST_PROCESS_CLIENT_HELLO,
1601 SSL_R_CLIENTHELLO_TLSEXT);
1602 goto f_err;
0f113f3e
MC		 1603 }
1604 }
e27f234a
MC		 1605#endif
1606 s->renegotiate = 2;
0f113f3e 1607
e27f234a 1608 return WORK_FINISHED_STOP;
0f113f3e 1609 f_err:
e27f234a 1610 ssl3_send_alert(s, SSL3_AL_FATAL, al);
fe3a3291 1611 ossl_statem_set_error(s);
e27f234a
MC		 1612 return WORK_ERROR;
1613}
1614
e27f234a 1615int tls_construct_server_hello(SSL *s)
0f113f3e
MC		 1616{
1617 unsigned char *buf;
1618 unsigned char *p, *d;
1619 int i, sl;
1620 int al = 0;
1621 unsigned long l;
1622
e27f234a 1623 buf = (unsigned char *)s->init_buf->data;
e481f9b9 1624
e27f234a
MC		 1625 /* Do the message type and length last */
1626 d = p = ssl_handshake_start(s);
0f113f3e 1627
e27f234a
MC		 1628 *(p++) = s->version >> 8;
1629 *(p++) = s->version & 0xff;
0f113f3e 1630
e27f234a
MC		 1631 /*
1632 * Random stuff. Filling of the server_random takes place in
1633 * tls_process_client_hello()
1634 */
1635 memcpy(p, s->s3->server_random, SSL3_RANDOM_SIZE);
1636 p += SSL3_RANDOM_SIZE;
0f113f3e 1637
e27f234a
MC		 1638 /*-
1639 * There are several cases for the session ID to send
1640 * back in the server hello:
1641 * - For session reuse from the session cache,
1642 * we send back the old session ID.
1643 * - If stateless session reuse (using a session ticket)
1644 * is successful, we send back the client's "session ID"
1645 * (which doesn't actually identify the session).
1646 * - If it is a new session, we send back the new
1647 * session ID.
1648 * - However, if we want the new session to be single-use,
1649 * we send back a 0-length session ID.
1650 * s->hit is non-zero in either case of session reuse,
1651 * so the following won't overwrite an ID that we're supposed
1652 * to send back.
1653 */
1654 if (s->session->not_resumable ||
1655 (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER)
1656 && !s->hit))
1657 s->session->session_id_length = 0;
1658
1659 sl = s->session->session_id_length;
1660 if (sl > (int)sizeof(s->session->session_id)) {
1661 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
fe3a3291 1662 ossl_statem_set_error(s);
e27f234a
MC		 1663 return 0;
1664 }
1665 *(p++) = sl;
1666 memcpy(p, s->session->session_id, sl);
1667 p += sl;
0f113f3e 1668
e27f234a
MC		 1669 /* put the cipher */
1670 i = ssl3_put_cipher_by_char(s->s3->tmp.new_cipher, p);
1671 p += i;
0f113f3e 1672
e27f234a 1673 /* put the compression method */
09b6c2ef 1674#ifdef OPENSSL_NO_COMP
e27f234a 1675 *(p++) = 0;
09b6c2ef 1676#else
e27f234a
MC		 1677 if (s->s3->tmp.new_compression == NULL)
1678 *(p++) = 0;
1679 else
1680 *(p++) = s->s3->tmp.new_compression->id;
09b6c2ef 1681#endif
e481f9b9 1682
e27f234a
MC		 1683 if (ssl_prepare_serverhello_tlsext(s) <= 0) {
1684 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_HELLO, SSL_R_SERVERHELLO_TLSEXT);
fe3a3291 1685 ossl_statem_set_error(s);
e27f234a
MC		 1686 return 0;
1687 }
1688 if ((p =
1689 ssl_add_serverhello_tlsext(s, p, buf + SSL3_RT_MAX_PLAIN_LENGTH,
1690 &al)) == NULL) {
1691 ssl3_send_alert(s, SSL3_AL_FATAL, al);
1692 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
fe3a3291 1693 ossl_statem_set_error(s);
e27f234a
MC		 1694 return 0;
1695 }
e481f9b9 1696
e27f234a
MC		 1697 /* do the header */
1698 l = (p - d);
1699 if (!ssl_set_handshake_header(s, SSL3_MT_SERVER_HELLO, l)) {
1700 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
fe3a3291 1701 ossl_statem_set_error(s);
e27f234a 1702 return 0;
0f113f3e 1703 }
d02b48c6 1704
e27f234a 1705 return 1;
0f113f3e 1706}
d02b48c6 1707
e27f234a
MC		 1708int tls_construct_server_done(SSL *s)
1709{
1710 if (!ssl_set_handshake_header(s, SSL3_MT_SERVER_DONE, 0)) {
1711 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_DONE, ERR_R_INTERNAL_ERROR);
fe3a3291 1712 ossl_statem_set_error(s);
e27f234a
MC		 1713 return 0;
1714 }
1715
1716 if (!s->s3->tmp.cert_request) {
1717 if (!ssl3_digest_cached_records(s, 0)) {
fe3a3291 1718 ossl_statem_set_error(s);
e27f234a
MC		 1719 }
1720 }
1721
1722 return 1;
1723}
1724
e27f234a 1725int tls_construct_server_key_exchange(SSL *s)
0f113f3e 1726{
bc36ee62 1727#ifndef OPENSSL_NO_RSA
0f113f3e
MC		 1728 unsigned char *q;
1729 int j, num;
1730 RSA *rsa;
1731 unsigned char md_buf[MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH];
1732 unsigned int u;
d02b48c6 1733#endif
bc36ee62 1734#ifndef OPENSSL_NO_DH
0f113f3e 1735 DH *dh = NULL, *dhp;
ea262260 1736#endif
10bf4fc2 1737#ifndef OPENSSL_NO_EC
0f113f3e
MC		 1738 EC_KEY *ecdh = NULL, *ecdhp;
1739 unsigned char *encodedPoint = NULL;
1740 int encodedlen = 0;
1741 int curve_id = 0;
1742 BN_CTX *bn_ctx = NULL;
d02b48c6 1743#endif
0f113f3e
MC		 1744 EVP_PKEY *pkey;
1745 const EVP_MD *md = NULL;
1746 unsigned char *p, *d;
1747 int al, i;
1748 unsigned long type;
1749 int n;
1750 CERT *cert;
1751 BIGNUM *r[4];
1752 int nr[4], kn;
1753 BUF_MEM *buf;
1754 EVP_MD_CTX md_ctx;
1755
1756 EVP_MD_CTX_init(&md_ctx);
0f113f3e 1757
e27f234a
MC		 1758 type = s->s3->tmp.new_cipher->algorithm_mkey;
1759 cert = s->cert;
1760
1761 buf = s->init_buf;
0f113f3e 1762
e27f234a
MC		 1763 r[0] = r[1] = r[2] = r[3] = NULL;
1764 n = 0;
85269210 1765#ifndef OPENSSL_NO_PSK
e27f234a
MC		 1766 if (type & SSL_PSK) {
1767 /*
1768 * reserve size for record length and PSK identity hint
1769 */
1770 n += 2;
1771 if (s->cert->psk_identity_hint)
1772 n += strlen(s->cert->psk_identity_hint);
1773 }
1774 /* Plain PSK or RSAPSK nothing to do */
1775 if (type & (SSL_kPSK | SSL_kRSAPSK)) {
1776 } else
85269210 1777#endif /* !OPENSSL_NO_PSK */
bc36ee62 1778#ifndef OPENSSL_NO_RSA
e27f234a
MC		 1779 if (type & SSL_kRSA) {
1780 rsa = cert->rsa_tmp;
1781 if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL)) {
1782 rsa = s->cert->rsa_tmp_cb(s,
1783 SSL_C_IS_EXPORT(s->s3->
1784 tmp.new_cipher),
1785 SSL_C_EXPORT_PKEYLENGTH(s->s3->
1786 tmp.new_cipher));
0f113f3e
MC		 1787 if (rsa == NULL) {
1788 al = SSL_AD_HANDSHAKE_FAILURE;
e27f234a
MC		 1789 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
1790 SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
0f113f3e
MC		 1791 goto f_err;
1792 }
e27f234a
MC		 1793 RSA_up_ref(rsa);
1794 cert->rsa_tmp = rsa;
1795 }
1796 if (rsa == NULL) {
1797 al = SSL_AD_HANDSHAKE_FAILURE;
1798 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
1799 SSL_R_MISSING_TMP_RSA_KEY);
1800 goto f_err;
1801 }
1802 r[0] = rsa->n;
1803 r[1] = rsa->e;
1804 s->s3->tmp.use_rsa_tmp = 1;
1805 } else
d02b48c6 1806#endif
bc36ee62 1807#ifndef OPENSSL_NO_DH
e27f234a
MC		 1808 if (type & (SSL_kDHE | SSL_kDHEPSK)) {
1809 if (s->cert->dh_tmp_auto) {
1810 dhp = ssl_get_auto_dh(s);
0f113f3e 1811 if (dhp == NULL) {
e27f234a
MC		 1812 al = SSL_AD_INTERNAL_ERROR;
1813 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
0f113f3e 1814 ERR_R_INTERNAL_ERROR);
e27f234a 1815 goto f_err;
0f113f3e 1816 }
e27f234a
MC		 1817 } else
1818 dhp = cert->dh_tmp;
1819 if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
1820 dhp = s->cert->dh_tmp_cb(s,
1821 SSL_C_IS_EXPORT(s->s3->
1822 tmp.new_cipher),
1823 SSL_C_EXPORT_PKEYLENGTH(s->s3->
1824 tmp.new_cipher));
1825 if (dhp == NULL) {
1826 al = SSL_AD_HANDSHAKE_FAILURE;
1827 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
1828 SSL_R_MISSING_TMP_DH_KEY);
1829 goto f_err;
1830 }
1831 if (!ssl_security(s, SSL_SECOP_TMP_DH,
1832 DH_security_bits(dhp), 0, dhp)) {
1833 al = SSL_AD_HANDSHAKE_FAILURE;
1834 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
1835 SSL_R_DH_KEY_TOO_SMALL);
1836 goto f_err;
1837 }
1838 if (s->s3->tmp.dh != NULL) {
1839 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
1840 ERR_R_INTERNAL_ERROR);
1841 goto err;
1842 }
0f113f3e 1843
e27f234a
MC		 1844 if (s->cert->dh_tmp_auto)
1845 dh = dhp;
1846 else if ((dh = DHparams_dup(dhp)) == NULL) {
1847 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_R_DH_LIB);
1848 goto err;
1849 }
1850
1851 s->s3->tmp.dh = dh;
1852 if ((dhp->pub_key == NULL ||
1853 dhp->priv_key == NULL ||
1854 (s->options & SSL_OP_SINGLE_DH_USE))) {
1855 if (!DH_generate_key(dh)) {
1856 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_R_DH_LIB);
0f113f3e
MC		 1857 goto err;
1858 }
e27f234a
MC		 1859 } else {
1860 dh->pub_key = BN_dup(dhp->pub_key);
1861 dh->priv_key = BN_dup(dhp->priv_key);
1862 if ((dh->pub_key == NULL) || (dh->priv_key == NULL)) {
1863 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_R_DH_LIB);
1864 goto err;
0f113f3e 1865 }
e27f234a
MC		 1866 }
1867 r[0] = dh->p;
1868 r[1] = dh->g;
1869 r[2] = dh->pub_key;
1870 } else
d02b48c6 1871#endif
10bf4fc2 1872#ifndef OPENSSL_NO_EC
e27f234a
MC		 1873 if (type & (SSL_kECDHE | SSL_kECDHEPSK)) {
1874 const EC_GROUP *group;
0f113f3e 1875
e27f234a
MC		 1876 ecdhp = cert->ecdh_tmp;
1877 if (s->cert->ecdh_tmp_auto) {
1878 /* Get NID of appropriate shared curve */
1879 int nid = tls1_shared_curve(s, -2);
1880 if (nid != NID_undef)
1881 ecdhp = EC_KEY_new_by_curve_name(nid);
1882 } else if ((ecdhp == NULL) && s->cert->ecdh_tmp_cb) {
1883 ecdhp = s->cert->ecdh_tmp_cb(s,
1884 SSL_C_IS_EXPORT(s->s3->
1885 tmp.new_cipher),
1886 SSL_C_EXPORT_PKEYLENGTH(s->
1887 s3->tmp.new_cipher));
1888 }
1889 if (ecdhp == NULL) {
1890 al = SSL_AD_HANDSHAKE_FAILURE;
1891 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
1892 SSL_R_MISSING_TMP_ECDH_KEY);
1893 goto f_err;
1894 }
1895
1896 if (s->s3->tmp.ecdh != NULL) {
1897 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
1898 ERR_R_INTERNAL_ERROR);
1899 goto err;
1900 }
1901
1902 /* Duplicate the ECDH structure. */
1903 if (ecdhp == NULL) {
1904 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_R_ECDH_LIB);
1905 goto err;
1906 }
1907 if (s->cert->ecdh_tmp_auto)
1908 ecdh = ecdhp;
1909 else if ((ecdh = EC_KEY_dup(ecdhp)) == NULL) {
1910 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_R_ECDH_LIB);
1911 goto err;
1912 }
0f113f3e 1913
e27f234a
MC		 1914 s->s3->tmp.ecdh = ecdh;
1915 if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
1916 (EC_KEY_get0_private_key(ecdh) == NULL) ||
1917 (s->options & SSL_OP_SINGLE_ECDH_USE)) {
1918 if (!EC_KEY_generate_key(ecdh)) {
1919 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
1920 ERR_R_ECDH_LIB);
0f113f3e
MC		 1921 goto err;
1922 }
e27f234a 1923 }
0f113f3e 1924
e27f234a
MC		 1925 if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
1926 (EC_KEY_get0_public_key(ecdh) == NULL) ||
1927 (EC_KEY_get0_private_key(ecdh) == NULL)) {
1928 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_R_ECDH_LIB);
1929 goto err;
1930 }
0f113f3e 1931
e27f234a
MC		 1932 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1933 (EC_GROUP_get_degree(group) > 163)) {
1934 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
1935 SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1936 goto err;
1937 }
0f113f3e 1938
e27f234a
MC		 1939 /*
1940 * XXX: For now, we only support ephemeral ECDH keys over named
1941 * (not generic) curves. For supported named curves, curve_id is
1942 * non-zero.
1943 */
1944 if ((curve_id =
1945 tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group)))
1946 == 0) {
1947 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
1948 SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1949 goto err;
1950 }
0f113f3e 1951
e27f234a
MC		 1952 /*
1953 * Encode the public key. First check the size of encoding and
1954 * allocate memory accordingly.
1955 */
1956 encodedlen = EC_POINT_point2oct(group,
1957 EC_KEY_get0_public_key(ecdh),
1958 POINT_CONVERSION_UNCOMPRESSED,
1959 NULL, 0, NULL);
1960
1961 encodedPoint = (unsigned char *)
1962 OPENSSL_malloc(encodedlen * sizeof(unsigned char));
1963 bn_ctx = BN_CTX_new();
1964 if ((encodedPoint == NULL) || (bn_ctx == NULL)) {
1965 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
1966 ERR_R_MALLOC_FAILURE);
1967 goto err;
1968 }
0f113f3e 1969
e27f234a
MC		 1970 encodedlen = EC_POINT_point2oct(group,
1971 EC_KEY_get0_public_key(ecdh),
1972 POINT_CONVERSION_UNCOMPRESSED,
1973 encodedPoint, encodedlen, bn_ctx);
0f113f3e 1974
e27f234a
MC		 1975 if (encodedlen == 0) {
1976 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_R_ECDH_LIB);
1977 goto err;
1978 }
0f113f3e 1979
e27f234a
MC		 1980 BN_CTX_free(bn_ctx);
1981 bn_ctx = NULL;
0f113f3e 1982
e27f234a
MC		 1983 /*
1984 * XXX: For now, we only support named (not generic) curves in
1985 * ECDH ephemeral key exchanges. In this situation, we need four
1986 * additional bytes to encode the entire ServerECDHParams
1987 * structure.
1988 */
1989 n += 4 + encodedlen;
0f113f3e 1990
e27f234a
MC		 1991 /*
1992 * We'll generate the serverKeyExchange message explicitly so we
1993 * can set these to NULLs
1994 */
1995 r[0] = NULL;
1996 r[1] = NULL;
1997 r[2] = NULL;
1998 r[3] = NULL;
1999 } else
10bf4fc2 2000#endif /* !OPENSSL_NO_EC */
edc032b5 2001#ifndef OPENSSL_NO_SRP
e27f234a
MC		 2002 if (type & SSL_kSRP) {
2003 if ((s->srp_ctx.N == NULL) ||
2004 (s->srp_ctx.g == NULL) ||
2005 (s->srp_ctx.s == NULL) || (s->srp_ctx.B == NULL)) {
2006 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
2007 SSL_R_MISSING_SRP_PARAM);
2008 goto err;
0f113f3e 2009 }
e27f234a
MC		 2010 r[0] = s->srp_ctx.N;
2011 r[1] = s->srp_ctx.g;
2012 r[2] = s->srp_ctx.s;
2013 r[3] = s->srp_ctx.B;
2014 } else
2015#endif
2016 {
2017 al = SSL_AD_HANDSHAKE_FAILURE;
2018 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
2019 SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
2020 goto f_err;
2021 }
2022 for (i = 0; i < 4 && r[i] != NULL; i++) {
2023 nr[i] = BN_num_bytes(r[i]);
edc032b5 2024#ifndef OPENSSL_NO_SRP
e27f234a
MC		 2025 if ((i == 2) && (type & SSL_kSRP))
2026 n += 1 + nr[i];
2027 else
edc032b5 2028#endif
e27f234a
MC		 2029 n += 2 + nr[i];
2030 }
0f113f3e 2031
e27f234a
MC		 2032 if (!(s->s3->tmp.new_cipher->algorithm_auth & (SSL_aNULL|SSL_aSRP))
2033 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_PSK)) {
2034 if ((pkey = ssl_get_sign_pkey(s, s->s3->tmp.new_cipher, &md))
2035 == NULL) {
2036 al = SSL_AD_DECODE_ERROR;
2037 goto f_err;
0f113f3e 2038 }
e27f234a
MC		 2039 kn = EVP_PKEY_size(pkey);
2040 } else {
2041 pkey = NULL;
2042 kn = 0;
2043 }
0f113f3e 2044
e27f234a
MC		 2045 if (!BUF_MEM_grow_clean(buf, n + SSL_HM_HEADER_LENGTH(s) + kn)) {
2046 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_LIB_BUF);
2047 goto err;
2048 }
2049 d = p = ssl_handshake_start(s);
0f113f3e 2050
85269210 2051#ifndef OPENSSL_NO_PSK
e27f234a
MC		 2052 if (type & SSL_PSK) {
2053 /* copy PSK identity hint */
2054 if (s->cert->psk_identity_hint) {
2055 s2n(strlen(s->cert->psk_identity_hint), p);
2056 strncpy((char *)p, s->cert->psk_identity_hint,
2057 strlen(s->cert->psk_identity_hint));
2058 p += strlen(s->cert->psk_identity_hint);
2059 } else {
2060 s2n(0, p);
85269210 2061 }
e27f234a 2062 }
85269210
DSH		 2063#endif
2064
e27f234a 2065 for (i = 0; i < 4 && r[i] != NULL; i++) {
edc032b5 2066#ifndef OPENSSL_NO_SRP
e27f234a
MC		 2067 if ((i == 2) && (type & SSL_kSRP)) {
2068 *p = nr[i];
2069 p++;
2070 } else
edc032b5 2071#endif
e27f234a
MC		 2072 s2n(nr[i], p);
2073 BN_bn2bin(r[i], p);
2074 p += nr[i];
2075 }
d02b48c6 2076
10bf4fc2 2077#ifndef OPENSSL_NO_EC
e27f234a
MC		 2078 if (type & (SSL_kECDHE | SSL_kECDHEPSK)) {
2079 /*
2080 * XXX: For now, we only support named (not generic) curves. In
2081 * this situation, the serverKeyExchange message has: [1 byte
2082 * CurveType], [2 byte CurveName] [1 byte length of encoded
2083 * point], followed by the actual encoded point itself
2084 */
2085 *p = NAMED_CURVE_TYPE;
2086 p += 1;
2087 *p = 0;
2088 p += 1;
2089 *p = curve_id;
2090 p += 1;
2091 *p = encodedlen;
2092 p += 1;
2093 memcpy(p, encodedPoint, encodedlen);
2094 OPENSSL_free(encodedPoint);
2095 encodedPoint = NULL;
2096 p += encodedlen;
2097 }
ea262260
BM		 2098#endif
2099
e27f234a
MC		 2100 /* not anonymous */
2101 if (pkey != NULL) {
2102 /*
2103 * n is the length of the params, they start at &(d[4]) and p
2104 * points to the space at the end.
2105 */
bc36ee62 2106#ifndef OPENSSL_NO_RSA
e27f234a
MC		 2107 if (pkey->type == EVP_PKEY_RSA && !SSL_USE_SIGALGS(s)) {
2108 q = md_buf;
2109 j = 0;
2110 for (num = 2; num > 0; num--) {
2111 EVP_MD_CTX_set_flags(&md_ctx,
2112 EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
5f3d93e4
MC		 2113 if (EVP_DigestInit_ex(&md_ctx, (num == 2)
2114 ? s->ctx->md5 : s->ctx->sha1, NULL) <= 0
2115 || EVP_DigestUpdate(&md_ctx, &(s->s3->client_random[0]),
2116 SSL3_RANDOM_SIZE) <= 0
2117 || EVP_DigestUpdate(&md_ctx, &(s->s3->server_random[0]),
2118 SSL3_RANDOM_SIZE) <= 0
2119 || EVP_DigestUpdate(&md_ctx, d, n) <= 0
2120 || EVP_DigestFinal_ex(&md_ctx, q,
2121 (unsigned int *)&i) <= 0) {
2122 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
2123 ERR_LIB_EVP);
2124 al = SSL_AD_INTERNAL_ERROR;
2125 goto f_err;
2126 }
e27f234a
MC		 2127 q += i;
2128 j += i;
2129 }
2130 if (RSA_sign(NID_md5_sha1, md_buf, j,
2131 &(p[2]), &u, pkey->pkey.rsa) <= 0) {
2132 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_LIB_RSA);
2133 goto err;
2134 }
2135 s2n(u, p);
2136 n += u + 2;
2137 } else
d02b48c6 2138#endif
e27f234a
MC		 2139 if (md) {
2140 /* send signature algorithm */
2141 if (SSL_USE_SIGALGS(s)) {
2142 if (!tls12_get_sigandhash(p, pkey, md)) {
2143 /* Should never happen */
2144 al = SSL_AD_INTERNAL_ERROR;
2145 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
2146 ERR_R_INTERNAL_ERROR);
2147 goto f_err;
0f113f3e 2148 }
e27f234a
MC		 2149 p += 2;
2150 }
a2f9200f 2151#ifdef SSL_DEBUG
e27f234a 2152 fprintf(stderr, "Using hash %s\n", EVP_MD_name(md));
a2f9200f 2153#endif
5f3d93e4
MC		 2154 if (EVP_SignInit_ex(&md_ctx, md, NULL) <= 0
2155 || EVP_SignUpdate(&md_ctx, &(s->s3->client_random[0]),
2156 SSL3_RANDOM_SIZE) <= 0
2157 || EVP_SignUpdate(&md_ctx, &(s->s3->server_random[0]),
2158 SSL3_RANDOM_SIZE) <= 0
2159 || EVP_SignUpdate(&md_ctx, d, n) <= 0
2160 || EVP_SignFinal(&md_ctx, &(p[2]),
2161 (unsigned int *)&i, pkey) <= 0) {
e27f234a 2162 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_LIB_EVP);
5f3d93e4
MC		 2163 al = SSL_AD_INTERNAL_ERROR;
2164 goto f_err;
0f113f3e 2165 }
e27f234a
MC		 2166 s2n(i, p);
2167 n += i + 2;
2168 if (SSL_USE_SIGALGS(s))
2169 n += 2;
2170 } else {
2171 /* Is this error check actually needed? */
77d514c5 2172 al = SSL_AD_HANDSHAKE_FAILURE;
e27f234a
MC		 2173 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
2174 SSL_R_UNKNOWN_PKEY_TYPE);
77d514c5
MC		 2175 goto f_err;
2176 }
0f113f3e
MC		 2177 }
2178
e27f234a
MC		 2179 if (!ssl_set_handshake_header(s, SSL3_MT_SERVER_KEY_EXCHANGE, n)) {
2180 al = SSL_AD_HANDSHAKE_FAILURE;
2181 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
2182 goto f_err;
2183 }
2184
0f113f3e 2185 EVP_MD_CTX_cleanup(&md_ctx);
e27f234a 2186 return 1;
0f113f3e
MC		 2187 f_err:
2188 ssl3_send_alert(s, SSL3_AL_FATAL, al);
2189 err:
556efe79 2190#ifndef OPENSSL_NO_EC
b548a1f1 2191 OPENSSL_free(encodedPoint);
0f113f3e 2192 BN_CTX_free(bn_ctx);
ea262260 2193#endif
0f113f3e 2194 EVP_MD_CTX_cleanup(&md_ctx);
fe3a3291 2195 ossl_statem_set_error(s);
e27f234a 2196 return 0;
0f113f3e 2197}
d02b48c6 2198
e27f234a 2199int tls_construct_certificate_request(SSL *s)
0f113f3e
MC		 2200{
2201 unsigned char *p, *d;
2202 int i, j, nl, off, n;
2203 STACK_OF(X509_NAME) *sk = NULL;
2204 X509_NAME *name;
2205 BUF_MEM *buf;
2206
e27f234a 2207 buf = s->init_buf;
0f113f3e 2208
e27f234a 2209 d = p = ssl_handshake_start(s);
0f113f3e 2210
e27f234a
MC		 2211 /* get the list of acceptable cert types */
2212 p++;
2213 n = ssl3_get_req_cert_type(s, p);
2214 d[0] = n;
2215 p += n;
2216 n++;
0f113f3e 2217
e27f234a
MC		 2218 if (SSL_USE_SIGALGS(s)) {
2219 const unsigned char *psigs;
2220 unsigned char *etmp = p;
2221 nl = tls12_get_psigalgs(s, &psigs);
2222 /* Skip over length for now */
0f113f3e 2223 p += 2;
e27f234a
MC		 2224 nl = tls12_copy_sigalgs(s, p, psigs, nl);
2225 /* Now fill in length */
2226 s2n(nl, etmp);
2227 p += nl;
2228 n += nl + 2;
2229 }
0f113f3e 2230
e27f234a
MC		 2231 off = n;
2232 p += 2;
2233 n += 2;
2234
2235 sk = SSL_get_client_CA_list(s);
2236 nl = 0;
2237 if (sk != NULL) {
2238 for (i = 0; i < sk_X509_NAME_num(sk); i++) {
2239 name = sk_X509_NAME_value(sk, i);
2240 j = i2d_X509_NAME(name, NULL);
2241 if (!BUF_MEM_grow_clean
2242 (buf, SSL_HM_HEADER_LENGTH(s) + n + j + 2)) {
2243 SSLerr(SSL_F_TLS_CONSTRUCT_CERTIFICATE_REQUEST,
2244 ERR_R_BUF_LIB);
2245 goto err;
0f113f3e 2246 }
e27f234a
MC		 2247 p = ssl_handshake_start(s) + n;
2248 s2n(j, p);
2249 i2d_X509_NAME(name, &p);
2250 n += 2 + j;
2251 nl += 2 + j;
0f113f3e 2252 }
e27f234a
MC		 2253 }
2254 /* else no CA names */
2255 p = ssl_handshake_start(s) + off;
2256 s2n(nl, p);
d02b48c6 2257
e27f234a
MC		 2258 if (!ssl_set_handshake_header(s, SSL3_MT_CERTIFICATE_REQUEST, n)) {
2259 SSLerr(SSL_F_TLS_CONSTRUCT_CERTIFICATE_REQUEST, ERR_R_INTERNAL_ERROR);
2260 goto err;
0f113f3e 2261 }
d02b48c6 2262
e27f234a
MC		 2263 s->s3->tmp.cert_request = 1;
2264
2265 return 1;
0f113f3e 2266 err:
fe3a3291 2267 ossl_statem_set_error(s);
e27f234a 2268 return 0;
0f113f3e 2269}
d02b48c6 2270
be3583fa 2271MSG_PROCESS_RETURN tls_process_client_key_exchange(SSL *s, PACKET *pkt)
e27f234a
MC		 2272{
2273 int al;
2274 unsigned int i;
0f113f3e 2275 unsigned long alg_k;
bc36ee62 2276#ifndef OPENSSL_NO_RSA
0f113f3e
MC		 2277 RSA *rsa = NULL;
2278 EVP_PKEY *pkey = NULL;
79df9d62 2279#endif
bc36ee62 2280#ifndef OPENSSL_NO_DH
0f113f3e
MC		 2281 BIGNUM *pub = NULL;
2282 DH *dh_srvr, *dh_clnt = NULL;
58964a49 2283#endif
556efe79 2284#ifndef OPENSSL_NO_EC
0f113f3e
MC		 2285 EC_KEY *srvr_ecdh = NULL;
2286 EVP_PKEY *clnt_pub_pkey = NULL;
2287 EC_POINT *clnt_ecpoint = NULL;
2288 BN_CTX *bn_ctx = NULL;
ea262260 2289#endif
73999b62 2290 PACKET enc_premaster;
20ca916d 2291 unsigned char *data, *rsa_decrypt = NULL;
ea262260 2292
0f113f3e 2293 alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
d02b48c6 2294
85269210
DSH		 2295#ifndef OPENSSL_NO_PSK
2296 /* For PSK parse and retrieve identity, obtain PSK key */
2297 if (alg_k & SSL_PSK) {
2298 unsigned char psk[PSK_MAX_PSK_LEN];
2299 size_t psklen;
73999b62 2300 PACKET psk_identity;
efcdbcbe 2301
73999b62 2302 if (!PACKET_get_length_prefixed_2(pkt, &psk_identity)) {
85269210 2303 al = SSL_AD_DECODE_ERROR;
e27f234a 2304 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, SSL_R_LENGTH_MISMATCH);
85269210
DSH		 2305 goto f_err;
2306 }
6d41fc80 2307 if (PACKET_remaining(&psk_identity) > PSK_MAX_IDENTITY_LEN) {
85269210 2308 al = SSL_AD_DECODE_ERROR;
e27f234a 2309 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE,
85269210
DSH		 2310 SSL_R_DATA_LENGTH_TOO_LONG);
2311 goto f_err;
2312 }
2313 if (s->psk_server_callback == NULL) {
2314 al = SSL_AD_INTERNAL_ERROR;
e27f234a 2315 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE,
85269210
DSH		 2316 SSL_R_PSK_NO_SERVER_CB);
2317 goto f_err;
2318 }
2319
6d41fc80 2320 if (!PACKET_strndup(&psk_identity, &s->session->psk_identity)) {
f0659bdb 2321 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
85269210 2322 al = SSL_AD_INTERNAL_ERROR;
efcdbcbe
MC		 2323 goto f_err;
2324 }
85269210
DSH		 2325
2326 psklen = s->psk_server_callback(s, s->session->psk_identity,
2327 psk, sizeof(psk));
2328
2329 if (psklen > PSK_MAX_PSK_LEN) {
2330 al = SSL_AD_INTERNAL_ERROR;
e27f234a 2331 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
85269210
DSH		 2332 goto f_err;
2333 } else if (psklen == 0) {
2334 /*
2335 * PSK related to the given identity not found
2336 */
e27f234a 2337 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE,
85269210
DSH		 2338 SSL_R_PSK_IDENTITY_NOT_FOUND);
2339 al = SSL_AD_UNKNOWN_PSK_IDENTITY;
2340 goto f_err;
2341 }
2342
2343 OPENSSL_free(s->s3->tmp.psk);
2344 s->s3->tmp.psk = BUF_memdup(psk, psklen);
2345 OPENSSL_cleanse(psk, psklen);
2346
2347 if (s->s3->tmp.psk == NULL) {
2348 al = SSL_AD_INTERNAL_ERROR;
e27f234a 2349 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
85269210
DSH		 2350 goto f_err;
2351 }
2352
2353 s->s3->tmp.psklen = psklen;
85269210
DSH		 2354 }
2355 if (alg_k & SSL_kPSK) {
2356 /* Identity extracted earlier: should be nothing left */
73999b62 2357 if (PACKET_remaining(pkt) != 0) {
85269210 2358 al = SSL_AD_HANDSHAKE_FAILURE;
e27f234a 2359 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, SSL_R_LENGTH_MISMATCH);
85269210
DSH		 2360 goto f_err;
2361 }
2362 /* PSK handled by ssl_generate_master_secret */
2363 if (!ssl_generate_master_secret(s, NULL, 0, 0)) {
2364 al = SSL_AD_INTERNAL_ERROR;
e27f234a 2365 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
85269210
DSH		 2366 goto f_err;
2367 }
2368 } else
2369#endif
bc36ee62 2370#ifndef OPENSSL_NO_RSA
85269210 2371 if (alg_k & (SSL_kRSA | SSL_kRSAPSK)) {
0f113f3e
MC		 2372 unsigned char rand_premaster_secret[SSL_MAX_MASTER_KEY_LENGTH];
2373 int decrypt_len;
2374 unsigned char decrypt_good, version_good;
2375 size_t j;
2376
2377 /* FIX THIS UP EAY EAY EAY EAY */
2378 if (s->s3->tmp.use_rsa_tmp) {
2379 if ((s->cert != NULL) && (s->cert->rsa_tmp != NULL))
2380 rsa = s->cert->rsa_tmp;
2381 /*
2382 * Don't do a callback because rsa_tmp should be sent already
2383 */
2384 if (rsa == NULL) {
2385 al = SSL_AD_HANDSHAKE_FAILURE;
e27f234a 2386 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE,
0f113f3e
MC		 2387 SSL_R_MISSING_TMP_RSA_PKEY);
2388 goto f_err;
2389
2390 }
2391 } else {
2392 pkey = s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
2393 if ((pkey == NULL) ||
2394 (pkey->type != EVP_PKEY_RSA) || (pkey->pkey.rsa == NULL)) {
2395 al = SSL_AD_HANDSHAKE_FAILURE;
e27f234a 2396 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE,
0f113f3e
MC		 2397 SSL_R_MISSING_RSA_CERTIFICATE);
2398 goto f_err;
2399 }
2400 rsa = pkey->pkey.rsa;
2401 }
2402
20ca916d
EK		 2403 /* SSLv3 and pre-standard DTLS omit the length bytes. */
2404 if (s->version == SSL3_VERSION || s->version == DTLS1_BAD_VER) {
73999b62 2405 enc_premaster = *pkt;
20ca916d 2406 } else {
73999b62
MC		 2407 PACKET orig = *pkt;
2408 if (!PACKET_get_length_prefixed_2(pkt, &enc_premaster)
2409 || PACKET_remaining(pkt) != 0) {
20ca916d
EK		 2410 /* Try SSLv3 behaviour for TLS. */
2411 if (s->options & SSL_OP_TLS_D5_BUG) {
2412 enc_premaster = orig;
2413 } else {
0f113f3e 2414 al = SSL_AD_DECODE_ERROR;
f0659bdb
MC		 2415 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE,
2416 SSL_R_LENGTH_MISMATCH);
0f113f3e 2417 goto f_err;
efcdbcbe
MC		 2418 }
2419 }
0f113f3e
MC		 2420 }
2421
2422 /*
20ca916d
EK		 2423 * We want to be sure that the plaintext buffer size makes it safe to
2424 * iterate over the entire size of a premaster secret
2425 * (SSL_MAX_MASTER_KEY_LENGTH). Reject overly short RSA keys because
2426 * their ciphertext cannot accommodate a premaster secret anyway.
0f113f3e 2427 */
20ca916d
EK		 2428 if (RSA_size(rsa) < SSL_MAX_MASTER_KEY_LENGTH) {
2429 al = SSL_AD_INTERNAL_ERROR;
f0659bdb 2430 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE,
20ca916d 2431 RSA_R_KEY_SIZE_TOO_SMALL);
0f113f3e
MC		 2432 goto f_err;
2433 }
2434
20ca916d
EK		 2435 rsa_decrypt = OPENSSL_malloc(RSA_size(rsa));
2436 if (rsa_decrypt == NULL) {
efcdbcbe 2437 al = SSL_AD_INTERNAL_ERROR;
f0659bdb 2438 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
efcdbcbe
MC		 2439 goto f_err;
2440 }
20ca916d 2441
0f113f3e
MC		 2442 /*
2443 * We must not leak whether a decryption failure occurs because of
2444 * Bleichenbacher's attack on PKCS #1 v1.5 RSA padding (see RFC 2246,
2445 * section 7.4.7.1). The code follows that advice of the TLS RFC and
2446 * generates a random premaster secret for the case that the decrypt
2447 * fails. See https://tools.ietf.org/html/rfc5246#section-7.4.7.1
2448 */
2449
266483d2 2450 if (RAND_bytes(rand_premaster_secret,
20ca916d 2451 sizeof(rand_premaster_secret)) <= 0) {
0f113f3e 2452 goto err;
20ca916d
EK		 2453 }
2454
2455 decrypt_len = RSA_private_decrypt(PACKET_remaining(&enc_premaster),
2456 PACKET_data(&enc_premaster),
2457 rsa_decrypt, rsa, RSA_PKCS1_PADDING);
0f113f3e
MC		 2458 ERR_clear_error();
2459
2460 /*
2461 * decrypt_len should be SSL_MAX_MASTER_KEY_LENGTH. decrypt_good will
2462 * be 0xff if so and zero otherwise.
2463 */
2464 decrypt_good =
2465 constant_time_eq_int_8(decrypt_len, SSL_MAX_MASTER_KEY_LENGTH);
2466
2467 /*
2468 * If the version in the decrypted pre-master secret is correct then
2469 * version_good will be 0xff, otherwise it'll be zero. The
2470 * Klima-Pokorny-Rosa extension of Bleichenbacher's attack
2471 * (http://eprint.iacr.org/2003/052/) exploits the version number
2472 * check as a "bad version oracle". Thus version checks are done in
2473 * constant time and are treated like any other decryption error.
2474 */
2475 version_good =
20ca916d
EK		 2476 constant_time_eq_8(rsa_decrypt[0],
2477 (unsigned)(s->client_version >> 8));
0f113f3e 2478 version_good &=
20ca916d
EK		 2479 constant_time_eq_8(rsa_decrypt[1],
2480 (unsigned)(s->client_version & 0xff));
0f113f3e
MC		 2481
2482 /*
2483 * The premaster secret must contain the same version number as the
2484 * ClientHello to detect version rollback attacks (strangely, the
2485 * protocol does not offer such protection for DH ciphersuites).
2486 * However, buggy clients exist that send the negotiated protocol
2487 * version instead if the server does not support the requested
2488 * protocol version. If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such
2489 * clients.
2490 */
2491 if (s->options & SSL_OP_TLS_ROLLBACK_BUG) {
2492 unsigned char workaround_good;
2493 workaround_good =
20ca916d 2494 constant_time_eq_8(rsa_decrypt[0], (unsigned)(s->version >> 8));
0f113f3e 2495 workaround_good &=
20ca916d
EK		 2496 constant_time_eq_8(rsa_decrypt[1],
2497 (unsigned)(s->version & 0xff));
0f113f3e
MC		 2498 version_good |= workaround_good;
2499 }
2500
2501 /*
2502 * Both decryption and version must be good for decrypt_good to
2503 * remain non-zero (0xff).
2504 */
2505 decrypt_good &= version_good;
2506
2507 /*
2508 * Now copy rand_premaster_secret over from p using
2509 * decrypt_good_mask. If decryption failed, then p does not
2510 * contain valid plaintext, however, a check above guarantees
2511 * it is still sufficiently large to read from.
2512 */
2513 for (j = 0; j < sizeof(rand_premaster_secret); j++) {
20ca916d
EK		 2514 rsa_decrypt[j] =
2515 constant_time_select_8(decrypt_good, rsa_decrypt[j],
2516 rand_premaster_secret[j]);
0f113f3e
MC		 2517 }
2518
20ca916d
EK		 2519 if (!ssl_generate_master_secret(s, rsa_decrypt,
2520 sizeof(rand_premaster_secret), 0)) {
69f68237 2521 al = SSL_AD_INTERNAL_ERROR;
e27f234a 2522 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
69f68237
MC		 2523 goto f_err;
2524 }
20ca916d
EK		 2525 OPENSSL_free(rsa_decrypt);
2526 rsa_decrypt = NULL;
0f113f3e 2527 } else
4c5fac4a 2528#endif
bc36ee62 2529#ifndef OPENSSL_NO_DH
85269210 2530 if (alg_k & (SSL_kDHE | SSL_kDHr | SSL_kDHd | SSL_kDHEPSK)) {
0f113f3e
MC		 2531 int idx = -1;
2532 EVP_PKEY *skey = NULL;
73999b62 2533 PACKET bookmark = *pkt;
efcdbcbe
MC		 2534 unsigned char shared[(OPENSSL_DH_MAX_MODULUS_BITS + 7) / 8];
2535
73999b62 2536 if (!PACKET_get_net_2(pkt, &i)) {
85269210 2537 if (alg_k & (SSL_kDHE | SSL_kDHEPSK)) {
d3cc5e61 2538 al = SSL_AD_HANDSHAKE_FAILURE;
e27f234a 2539 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE,
d3cc5e61
MC		 2540 SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
2541 goto f_err;
2542 }
0f113f3e 2543 i = 0;
d3cc5e61 2544 }
73999b62 2545 if (PACKET_remaining(pkt) != i) {
0f113f3e 2546 if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG)) {
e27f234a 2547 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE,
0f113f3e
MC		 2548 SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
2549 goto err;
2550 } else {
73999b62
MC		 2551 *pkt = bookmark;
2552 i = PACKET_remaining(pkt);
0f113f3e
MC		 2553 }
2554 }
2555 if (alg_k & SSL_kDHr)
2556 idx = SSL_PKEY_DH_RSA;
2557 else if (alg_k & SSL_kDHd)
2558 idx = SSL_PKEY_DH_DSA;
2559 if (idx >= 0) {
2560 skey = s->cert->pkeys[idx].privatekey;
2561 if ((skey == NULL) ||
2562 (skey->type != EVP_PKEY_DH) || (skey->pkey.dh == NULL)) {
2563 al = SSL_AD_HANDSHAKE_FAILURE;
e27f234a 2564 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE,
0f113f3e
MC		 2565 SSL_R_MISSING_RSA_CERTIFICATE);
2566 goto f_err;
2567 }
2568 dh_srvr = skey->pkey.dh;
2569 } else if (s->s3->tmp.dh == NULL) {
2570 al = SSL_AD_HANDSHAKE_FAILURE;
e27f234a 2571 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE,
0f113f3e
MC		 2572 SSL_R_MISSING_TMP_DH_KEY);
2573 goto f_err;
2574 } else
2575 dh_srvr = s->s3->tmp.dh;
2576
73999b62 2577 if (PACKET_remaining(pkt) == 0L) {
0f113f3e
MC		 2578 /* Get pubkey from cert */
2579 EVP_PKEY *clkey = X509_get_pubkey(s->session->peer);
2580 if (clkey) {
2581 if (EVP_PKEY_cmp_parameters(clkey, skey) == 1)
2582 dh_clnt = EVP_PKEY_get1_DH(clkey);
2583 }
2584 if (dh_clnt == NULL) {
2585 al = SSL_AD_HANDSHAKE_FAILURE;
e27f234a 2586 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE,
0f113f3e
MC		 2587 SSL_R_MISSING_TMP_DH_KEY);
2588 goto f_err;
2589 }
2590 EVP_PKEY_free(clkey);
2591 pub = dh_clnt->pub_key;
efcdbcbe 2592 } else {
73999b62 2593 if (!PACKET_get_bytes(pkt, &data, i)) {
efcdbcbe
MC		 2594 /* We already checked we have enough data */
2595 al = SSL_AD_INTERNAL_ERROR;
e27f234a 2596 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE,
efcdbcbe
MC		 2597 ERR_R_INTERNAL_ERROR);
2598 goto f_err;
2599 }
2600 pub = BN_bin2bn(data, i, NULL);
2601 }
0f113f3e 2602 if (pub == NULL) {
e27f234a 2603 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, SSL_R_BN_LIB);
0f113f3e
MC		 2604 goto err;
2605 }
2606
efcdbcbe 2607 i = DH_compute_key(shared, pub, dh_srvr);
0f113f3e
MC		 2608
2609 if (i <= 0) {
e27f234a 2610 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_DH_LIB);
0f113f3e
MC		 2611 BN_clear_free(pub);
2612 goto err;
2613 }
2614
2615 DH_free(s->s3->tmp.dh);
2616 s->s3->tmp.dh = NULL;
2617 if (dh_clnt)
2618 DH_free(dh_clnt);
2619 else
2620 BN_clear_free(pub);
2621 pub = NULL;
efcdbcbe 2622 if (!ssl_generate_master_secret(s, shared, i, 0)) {
69f68237 2623 al = SSL_AD_INTERNAL_ERROR;
e27f234a 2624 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
69f68237
MC		 2625 goto f_err;
2626 }
e27f234a 2627 if (dh_clnt) {
a71a4966 2628 s->statem.no_cert_verify = 1;
e27f234a
MC		 2629 return MSG_PROCESS_CONTINUE_PROCESSING;
2630 }
0f113f3e 2631 } else
d02b48c6 2632#endif
ea262260 2633
556efe79 2634#ifndef OPENSSL_NO_EC
85269210 2635 if (alg_k & (SSL_kECDHE | SSL_kECDHr | SSL_kECDHe | SSL_kECDHEPSK)) {
0f113f3e
MC		 2636 int field_size = 0;
2637 const EC_KEY *tkey;
2638 const EC_GROUP *group;
2639 const BIGNUM *priv_key;
efcdbcbe 2640 unsigned char *shared;
0f113f3e
MC		 2641
2642 /* initialize structures for server's ECDH key pair */
2643 if ((srvr_ecdh = EC_KEY_new()) == NULL) {
e27f234a 2644 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
0f113f3e
MC		 2645 goto err;
2646 }
2647
2648 /* Let's get server private key and group information */
2649 if (alg_k & (SSL_kECDHr | SSL_kECDHe)) {
2650 /* use the certificate */
2651 tkey = s->cert->pkeys[SSL_PKEY_ECC].privatekey->pkey.ec;
2652 } else {
2653 /*
2654 * use the ephermeral values we saved when generating the
2655 * ServerKeyExchange msg.
2656 */
2657 tkey = s->s3->tmp.ecdh;
2658 }
2659
2660 group = EC_KEY_get0_group(tkey);
2661 priv_key = EC_KEY_get0_private_key(tkey);
2662
2663 if (!EC_KEY_set_group(srvr_ecdh, group) ||
2664 !EC_KEY_set_private_key(srvr_ecdh, priv_key)) {
e27f234a 2665 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_EC_LIB);
0f113f3e
MC		 2666 goto err;
2667 }
2668
2669 /* Let's get client's public key */
2670 if ((clnt_ecpoint = EC_POINT_new(group)) == NULL) {
e27f234a 2671 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
0f113f3e
MC		 2672 goto err;
2673 }
2674
73999b62 2675 if (PACKET_remaining(pkt) == 0L) {
0f113f3e
MC		 2676 /* Client Publickey was in Client Certificate */
2677
85269210 2678 if (alg_k & (SSL_kECDHE | SSL_kECDHEPSK)) {
0f113f3e 2679 al = SSL_AD_HANDSHAKE_FAILURE;
e27f234a 2680 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE,
0f113f3e
MC		 2681 SSL_R_MISSING_TMP_ECDH_KEY);
2682 goto f_err;
2683 }
2684 if (((clnt_pub_pkey = X509_get_pubkey(s->session->peer))
2685 == NULL) || (clnt_pub_pkey->type != EVP_PKEY_EC)) {
2686 /*
2687 * XXX: For now, we do not support client authentication
2688 * using ECDH certificates so this branch (n == 0L) of the
2689 * code is never executed. When that support is added, we
2690 * ought to ensure the key received in the certificate is
2691 * authorized for key agreement. ECDH_compute_key implicitly
2692 * checks that the two ECDH shares are for the same group.
2693 */
2694 al = SSL_AD_HANDSHAKE_FAILURE;
e27f234a 2695 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE,
0f113f3e
MC		 2696 SSL_R_UNABLE_TO_DECODE_ECDH_CERTS);
2697 goto f_err;
2698 }
2699
2700 if (EC_POINT_copy(clnt_ecpoint,
2701 EC_KEY_get0_public_key(clnt_pub_pkey->
2702 pkey.ec)) == 0) {
e27f234a 2703 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_EC_LIB);
0f113f3e
MC		 2704 goto err;
2705 }
a71a4966 2706 s->statem.no_cert_verify = 1;
0f113f3e
MC		 2707 } else {
2708 /*
2709 * Get client's public key from encoded point in the
2710 * ClientKeyExchange message.
2711 */
2712 if ((bn_ctx = BN_CTX_new()) == NULL) {
e27f234a 2713 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE,
0f113f3e
MC		 2714 ERR_R_MALLOC_FAILURE);
2715 goto err;
2716 }
2717
2718 /* Get encoded point length */
73999b62 2719 if (!PACKET_get_1(pkt, &i)) {
efcdbcbe 2720 al = SSL_AD_DECODE_ERROR;
e27f234a 2721 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE,
efcdbcbe
MC		 2722 SSL_R_LENGTH_MISMATCH);
2723 goto f_err;
2724 }
73999b62
MC		 2725 if (!PACKET_get_bytes(pkt, &data, i)
2726 || PACKET_remaining(pkt) != 0) {
e27f234a 2727 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_EC_LIB);
0f113f3e
MC		 2728 goto err;
2729 }
efcdbcbe 2730 if (EC_POINT_oct2point(group, clnt_ecpoint, data, i, bn_ctx) == 0) {
e27f234a 2731 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_EC_LIB);
0f113f3e
MC		 2732 goto err;
2733 }
0f113f3e
MC		 2734 }
2735
2736 /* Compute the shared pre-master secret */
2737 field_size = EC_GROUP_get_degree(group);
2738 if (field_size <= 0) {
e27f234a 2739 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
0f113f3e
MC		 2740 goto err;
2741 }
efcdbcbe
MC		 2742 shared = OPENSSL_malloc((field_size + 7) / 8);
2743 if (shared == NULL) {
e27f234a 2744 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
efcdbcbe
MC		 2745 goto err;
2746 }
2747 i = ECDH_compute_key(shared, (field_size + 7) / 8, clnt_ecpoint,
2748 srvr_ecdh, NULL);
0f113f3e 2749 if (i <= 0) {
e27f234a 2750 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
efcdbcbe 2751 OPENSSL_free(shared);
0f113f3e
MC		 2752 goto err;
2753 }
2754
2755 EVP_PKEY_free(clnt_pub_pkey);
2756 EC_POINT_free(clnt_ecpoint);
2757 EC_KEY_free(srvr_ecdh);
2758 BN_CTX_free(bn_ctx);
2759 EC_KEY_free(s->s3->tmp.ecdh);
2760 s->s3->tmp.ecdh = NULL;
2761
efcdbcbe 2762 if (!ssl_generate_master_secret(s, shared, i, 1)) {
69f68237 2763 al = SSL_AD_INTERNAL_ERROR;
e27f234a 2764 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
69f68237
MC		 2765 goto f_err;
2766 }
e27f234a 2767 return MSG_PROCESS_CONTINUE_PROCESSING;
0f113f3e 2768 } else
ddac1974 2769#endif
edc032b5 2770#ifndef OPENSSL_NO_SRP
0f113f3e 2771 if (alg_k & SSL_kSRP) {
73999b62
MC		 2772 if (!PACKET_get_net_2(pkt, &i)
2773 || !PACKET_get_bytes(pkt, &data, i)) {
0f113f3e 2774 al = SSL_AD_DECODE_ERROR;
e27f234a 2775 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, SSL_R_BAD_SRP_A_LENGTH);
0f113f3e
MC		 2776 goto f_err;
2777 }
efcdbcbe 2778 if ((s->srp_ctx.A = BN_bin2bn(data, i, NULL)) == NULL) {
e27f234a 2779 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_BN_LIB);
0f113f3e
MC		 2780 goto err;
2781 }
2782 if (BN_ucmp(s->srp_ctx.A, s->srp_ctx.N) >= 0
2783 || BN_is_zero(s->srp_ctx.A)) {
2784 al = SSL_AD_ILLEGAL_PARAMETER;
e27f234a 2785 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE,
0f113f3e
MC		 2786 SSL_R_BAD_SRP_PARAMETERS);
2787 goto f_err;
2788 }
b548a1f1 2789 OPENSSL_free(s->session->srp_username);
0f113f3e
MC		 2790 s->session->srp_username = BUF_strdup(s->srp_ctx.login);
2791 if (s->session->srp_username == NULL) {
e27f234a 2792 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
0f113f3e
MC		 2793 goto err;
2794 }
2795
57b272b0 2796 if (!srp_generate_server_master_secret(s)) {
e27f234a 2797 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
0f113f3e
MC		 2798 goto err;
2799 }
0f113f3e
MC		 2800 } else
2801#endif /* OPENSSL_NO_SRP */
2802 if (alg_k & SSL_kGOST) {
0f113f3e
MC		 2803 EVP_PKEY_CTX *pkey_ctx;
2804 EVP_PKEY *client_pub_pkey = NULL, *pk = NULL;
2805 unsigned char premaster_secret[32], *start;
2806 size_t outlen = 32, inlen;
2807 unsigned long alg_a;
2808 int Ttag, Tclass;
2809 long Tlen;
73999b62 2810 long sess_key_len;
0f113f3e
MC		 2811
2812 /* Get our certificate private key */
2813 alg_a = s->s3->tmp.new_cipher->algorithm_auth;
e44380a9
DB		 2814 if (alg_a & SSL_aGOST12) {
2815 /*
2816 * New GOST ciphersuites have SSL_aGOST01 bit too
2817 */
2818 pk = s->cert->pkeys[SSL_PKEY_GOST12_512].privatekey;
2819 if (pk == NULL) {
2820 pk = s->cert->pkeys[SSL_PKEY_GOST12_256].privatekey;
2821 }
2822 if (pk == NULL) {
2823 pk = s->cert->pkeys[SSL_PKEY_GOST01].privatekey;
2824 }
2825 } else if (alg_a & SSL_aGOST01) {
0f113f3e 2826 pk = s->cert->pkeys[SSL_PKEY_GOST01].privatekey;
e44380a9 2827 }
0f113f3e
MC		 2828
2829 pkey_ctx = EVP_PKEY_CTX_new(pk, NULL);
a71edf3b
MC		 2830 if (pkey_ctx == NULL) {
2831 al = SSL_AD_INTERNAL_ERROR;
2832 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
2833 goto f_err;
2834 }
5f3d93e4
MC		 2835 if (EVP_PKEY_decrypt_init(pkey_ctx) <= 0) {
2836 al = SSL_AD_INTERNAL_ERROR;
2837 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
2838 goto f_err;
2839 }
0f113f3e
MC		 2840 /*
2841 * If client certificate is present and is of the same type, maybe
2842 * use it for key exchange. Don't mind errors from
2843 * EVP_PKEY_derive_set_peer, because it is completely valid to use a
2844 * client certificate for authorization only.
2845 */
2846 client_pub_pkey = X509_get_pubkey(s->session->peer);
2847 if (client_pub_pkey) {
2848 if (EVP_PKEY_derive_set_peer(pkey_ctx, client_pub_pkey) <= 0)
2849 ERR_clear_error();
2850 }
2851 /* Decrypt session key */
73999b62
MC		 2852 sess_key_len = PACKET_remaining(pkt);
2853 if (!PACKET_get_bytes(pkt, &data, sess_key_len)) {
efcdbcbe 2854 al = SSL_AD_INTERNAL_ERROR;
e27f234a 2855 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
5f3d93e4 2856 goto gerr;
efcdbcbe 2857 }
73999b62
MC		 2858 if (ASN1_get_object ((const unsigned char **)&data, &Tlen, &Ttag,
2859 &Tclass, sess_key_len) != V_ASN1_CONSTRUCTED
2860 || Ttag != V_ASN1_SEQUENCE
0f113f3e 2861 || Tclass != V_ASN1_UNIVERSAL) {
5f3d93e4 2862 al = SSL_AD_DECODE_ERROR;
e27f234a 2863 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE,
0f113f3e
MC		 2864 SSL_R_DECRYPTION_FAILED);
2865 goto gerr;
2866 }
efcdbcbe 2867 start = data;
0f113f3e
MC		 2868 inlen = Tlen;
2869 if (EVP_PKEY_decrypt
2870 (pkey_ctx, premaster_secret, &outlen, start, inlen) <= 0) {
ba4f1331 2871 al = SSL_AD_DECODE_ERROR;
e27f234a 2872 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE,
0f113f3e
MC		 2873 SSL_R_DECRYPTION_FAILED);
2874 goto gerr;
2875 }
2876 /* Generate master secret */
57b272b0
DSH		 2877 if (!ssl_generate_master_secret(s, premaster_secret,
2878 sizeof(premaster_secret), 0)) {
69f68237 2879 al = SSL_AD_INTERNAL_ERROR;
e27f234a 2880 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
5f3d93e4 2881 goto gerr;
69f68237 2882 }
0f113f3e
MC		 2883 /* Check if pubkey from client certificate was used */
2884 if (EVP_PKEY_CTX_ctrl
2885 (pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0)
a71a4966 2886 s->statem.no_cert_verify = 1;
e27f234a
MC		 2887
2888 EVP_PKEY_free(client_pub_pkey);
2889 EVP_PKEY_CTX_free(pkey_ctx);
2890 return MSG_PROCESS_CONTINUE_PROCESSING;
0f113f3e
MC		 2891 gerr:
2892 EVP_PKEY_free(client_pub_pkey);
2893 EVP_PKEY_CTX_free(pkey_ctx);
5f3d93e4 2894 goto f_err;
0f113f3e
MC		 2895 } else {
2896 al = SSL_AD_HANDSHAKE_FAILURE;
e27f234a 2897 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, SSL_R_UNKNOWN_CIPHER_TYPE);
0f113f3e
MC		 2898 goto f_err;
2899 }
2900
e27f234a 2901 return MSG_PROCESS_CONTINUE_PROCESSING;
0f113f3e
MC		 2902 f_err:
2903 ssl3_send_alert(s, SSL3_AL_FATAL, al);
556efe79 2904#if !defined(OPENSSL_NO_DH) || !defined(OPENSSL_NO_RSA) || !defined(OPENSSL_NO_EC) || defined(OPENSSL_NO_SRP)
0f113f3e 2905 err:
ea262260 2906#endif
556efe79 2907#ifndef OPENSSL_NO_EC
0f113f3e
MC		 2908 EVP_PKEY_free(clnt_pub_pkey);
2909 EC_POINT_free(clnt_ecpoint);
8fdc3734 2910 EC_KEY_free(srvr_ecdh);
0f113f3e 2911 BN_CTX_free(bn_ctx);
20ca916d 2912 OPENSSL_free(rsa_decrypt);
85269210
DSH		 2913#endif
2914#ifndef OPENSSL_NO_PSK
2915 OPENSSL_clear_free(s->s3->tmp.psk, s->s3->tmp.psklen);
2916 s->s3->tmp.psk = NULL;
58964a49 2917#endif
fe3a3291 2918 ossl_statem_set_error(s);
e27f234a 2919 return MSG_PROCESS_ERROR;
0f113f3e 2920}
d02b48c6 2921
be3583fa 2922WORK_STATE tls_post_process_client_key_exchange(SSL *s, WORK_STATE wst)
94836de2 2923{
94836de2 2924#ifndef OPENSSL_NO_SCTP
c130dd8e
MC		 2925 if (wst == WORK_MORE_A) {
2926 if (SSL_IS_DTLS(s)) {
2927 unsigned char sctpauthkey[64];
2928 char labelbuffer[sizeof(DTLS1_SCTP_AUTH_LABEL)];
2929 /*
2930 * Add new shared key for SCTP-Auth, will be ignored if no SCTP
2931 * used.
2932 */
141eb8c6
MC		 2933 memcpy(labelbuffer, DTLS1_SCTP_AUTH_LABEL,
2934 sizeof(DTLS1_SCTP_AUTH_LABEL));
c130dd8e
MC		 2935
2936 if (SSL_export_keying_material(s, sctpauthkey,
2937 sizeof(sctpauthkey), labelbuffer,
2938 sizeof(labelbuffer), NULL, 0, 0) <= 0) {
fe3a3291 2939 ossl_statem_set_error(s);
c130dd8e
MC		 2940 return WORK_ERROR;;
2941 }
94836de2 2942
c130dd8e
MC		 2943 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
2944 sizeof(sctpauthkey), sctpauthkey);
94836de2 2945 }
c130dd8e
MC		 2946 wst = WORK_MORE_B;
2947 }
94836de2 2948
c130dd8e
MC		 2949 if ((wst == WORK_MORE_B)
2950 /* Is this SCTP? */
2951 && BIO_dgram_is_sctp(SSL_get_wbio(s))
2952 /* Are we renegotiating? */
2953 && s->renegotiate
2954 /* Are we going to skip the CertificateVerify? */
a71a4966 2955 && (s->session->peer == NULL || s->statem.no_cert_verify)
c130dd8e
MC		 2956 && BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) {
2957 s->s3->in_read_app_data = 2;
2958 s->rwstate = SSL_READING;
2959 BIO_clear_retry_flags(SSL_get_rbio(s));
2960 BIO_set_retry_read(SSL_get_rbio(s));
d99b0691 2961 ossl_statem_set_sctp_read_sock(s, 1);
c130dd8e
MC		 2962 return WORK_MORE_B;
2963 } else {
fe3a3291 2964 ossl_statem_set_sctp_read_sock(s, 0);
94836de2
MC		 2965 }
2966#endif
2967
a71a4966 2968 if (s->statem.no_cert_verify) {
94836de2
MC		 2969 /* No certificate verify so we no longer need the handshake_buffer */
2970 BIO_free(s->s3->handshake_buffer);
e44380a9 2971 s->s3->handshake_buffer = NULL;
94836de2 2972 return WORK_FINISHED_CONTINUE;
e44380a9
DB		 2973 } else if (SSL_USE_SIGALGS(s) || (s->s3->tmp.new_cipher->algorithm_auth
2974 & (SSL_aGOST12|SSL_aGOST01) )) {
94836de2
MC		 2975 if (!s->session->peer) {
2976 /* No peer certificate so we no longer need the handshake_buffer */
2977 BIO_free(s->s3->handshake_buffer);
2978 return WORK_FINISHED_CONTINUE;
2979 }
2980 if (!s->s3->handshake_buffer) {
2981 SSLerr(SSL_F_TLS_POST_PROCESS_CLIENT_KEY_EXCHANGE,
2982 ERR_R_INTERNAL_ERROR);
fe3a3291 2983 ossl_statem_set_error(s);
94836de2
MC		 2984 return WORK_ERROR;
2985 }
2986 /*
2987 * For sigalgs freeze the handshake buffer. If we support
2988 * extms we've done this already so this is a no-op
2989 */
2990 if (!ssl3_digest_cached_records(s, 1)) {
fe3a3291 2991 ossl_statem_set_error(s);
94836de2
MC		 2992 return WORK_ERROR;
2993 }
2994 } else {
2995 int offset = 0;
2996 int dgst_num;
2997
2998 /*
2999 * We need to get hashes here so if there is a client cert,
3000 * it can be verified FIXME - digest processing for
3001 * CertificateVerify should be generalized. But it is next
3002 * step
3003 */
3004 if (!ssl3_digest_cached_records(s, 0)) {
fe3a3291 3005 ossl_statem_set_error(s);
94836de2
MC		 3006 return WORK_ERROR;
3007 }
3008 for (dgst_num = 0; dgst_num < SSL_MAX_DIGEST; dgst_num++) {
3009 if (s->s3->handshake_dgst[dgst_num]) {
3010 int dgst_size;
3011
3012 s->method->ssl3_enc->cert_verify_mac(s,
3013 EVP_MD_CTX_type
3014 (s->
3015 s3->handshake_dgst
3016 [dgst_num]),
3017 &(s->s3->
3018 tmp.cert_verify_md
3019 [offset]));
3020 dgst_size =
3021 EVP_MD_CTX_size(s->s3->handshake_dgst[dgst_num]);
3022 if (dgst_size < 0) {
fe3a3291 3023 ossl_statem_set_error(s);
94836de2
MC		 3024 return WORK_ERROR;
3025 }
3026 offset += dgst_size;
3027 }
3028 }
3029 }
3030
3031 return WORK_FINISHED_CONTINUE;
3032}
3033
be3583fa 3034MSG_PROCESS_RETURN tls_process_cert_verify(SSL *s, PACKET *pkt)
e27f234a
MC		 3035{
3036 EVP_PKEY *pkey = NULL;
3037 unsigned char *sig, *data;
3038 int al, ret = MSG_PROCESS_ERROR;
3039 int type = 0, i, j;
3040 unsigned int len;
3041 X509 *peer;
3042 const EVP_MD *md = NULL;
3043 EVP_MD_CTX mctx;
e27f234a
MC		 3044 EVP_MD_CTX_init(&mctx);
3045
a0bd6493
MC		 3046 peer = s->session->peer;
3047 pkey = X509_get_pubkey(peer);
3048 type = X509_certificate_type(peer, pkey);
0f113f3e
MC		 3049
3050 if (!(type & EVP_PKT_SIGN)) {
e27f234a 3051 SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY,
0f113f3e
MC		 3052 SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
3053 al = SSL_AD_ILLEGAL_PARAMETER;
3054 goto f_err;
3055 }
3056
0f113f3e
MC		 3057 /* Check for broken implementations of GOST ciphersuites */
3058 /*
3059 * If key is GOST and n is exactly 64, it is bare signature without
e44380a9 3060 * length field (CryptoPro implementations at least till CSP 4.0)
0f113f3e 3061 */
73999b62 3062 if (PACKET_remaining(pkt) == 64 && pkey->type == NID_id_GostR3410_2001) {
f532a35d 3063 len = 64;
0f113f3e
MC		 3064 } else {
3065 if (SSL_USE_SIGALGS(s)) {
f532a35d
MC		 3066 int rv;
3067
73999b62 3068 if (!PACKET_get_bytes(pkt, &sig, 2)) {
f532a35d
MC		 3069 al = SSL_AD_DECODE_ERROR;
3070 goto f_err;
3071 }
3072 rv = tls12_check_peer_sigalg(&md, s, sig, pkey);
0f113f3e
MC		 3073 if (rv == -1) {
3074 al = SSL_AD_INTERNAL_ERROR;
3075 goto f_err;
3076 } else if (rv == 0) {
3077 al = SSL_AD_DECODE_ERROR;
3078 goto f_err;
3079 }
f37f20ff 3080#ifdef SSL_DEBUG
0f113f3e 3081 fprintf(stderr, "USING TLSv1.2 HASH %s\n", EVP_MD_name(md));
f37f20ff 3082#endif
0f113f3e 3083 }
73999b62 3084 if (!PACKET_get_net_2(pkt, &len)) {
e27f234a 3085 SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, SSL_R_LENGTH_MISMATCH);
0f113f3e
MC		 3086 al = SSL_AD_DECODE_ERROR;
3087 goto f_err;
3088 }
3089 }
3090 j = EVP_PKEY_size(pkey);
73999b62
MC		 3091 if (((int)len > j) || ((int)PACKET_remaining(pkt) > j)
3092 || (PACKET_remaining(pkt) == 0)) {
e27f234a 3093 SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, SSL_R_WRONG_SIGNATURE_SIZE);
0f113f3e
MC		 3094 al = SSL_AD_DECODE_ERROR;
3095 goto f_err;
3096 }
73999b62 3097 if (!PACKET_get_bytes(pkt, &data, len)) {
e27f234a 3098 SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, SSL_R_LENGTH_MISMATCH);
f532a35d
MC		 3099 al = SSL_AD_DECODE_ERROR;
3100 goto f_err;
3101 }
0f113f3e 3102
e44380a9
DB		 3103 if (SSL_USE_SIGALGS(s)
3104 || pkey->type == NID_id_GostR3410_2001
3105 || pkey->type == NID_id_GostR3410_2012_256
3106 || pkey->type == NID_id_GostR3410_2012_512) {
0f113f3e
MC		 3107 long hdatalen = 0;
3108 void *hdata;
3109 hdatalen = BIO_get_mem_data(s->s3->handshake_buffer, &hdata);
3110 if (hdatalen <= 0) {
e27f234a 3111 SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, ERR_R_INTERNAL_ERROR);
0f113f3e
MC		 3112 al = SSL_AD_INTERNAL_ERROR;
3113 goto f_err;
3114 }
f37f20ff 3115#ifdef SSL_DEBUG
0f113f3e
MC		 3116 fprintf(stderr, "Using TLS 1.2 with client verify alg %s\n",
3117 EVP_MD_name(md));
f37f20ff 3118#endif
e44380a9
DB		 3119 if (!SSL_USE_SIGALGS(s)) {
3120 int dgst_nid;
3121 if (EVP_PKEY_get_default_digest_nid(pkey, &dgst_nid) <= 0
3122 || (md = EVP_get_digestbynid(dgst_nid)) == NULL) {
3123 SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, ERR_R_INTERNAL_ERROR);
3124 al = SSL_AD_INTERNAL_ERROR;
3125 goto f_err;
3126 }
3127 }
0f113f3e
MC		 3128 if (!EVP_VerifyInit_ex(&mctx, md, NULL)
3129 || !EVP_VerifyUpdate(&mctx, hdata, hdatalen)) {
e27f234a 3130 SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, ERR_R_EVP_LIB);
0f113f3e
MC		 3131 al = SSL_AD_INTERNAL_ERROR;
3132 goto f_err;
3133 }
3134
e44380a9
DB		 3135 if (pkey->type == NID_id_GostR3410_2001
3136 || pkey->type == NID_id_GostR3410_2012_256
3137 || pkey->type == NID_id_GostR3410_2012_512) {
3138 unsigned int j1, j2;
3139 for (j1 = len - 1, j2 = 0; j2 < len/2; j2++, j1--) {
3140 char c = data[j2];
3141 data[j2] = data[j1];
3142 data[j1] = c;
3143 }
3144 }
3145
f532a35d 3146 if (EVP_VerifyFinal(&mctx, data, len, pkey) <= 0) {
0f113f3e 3147 al = SSL_AD_DECRYPT_ERROR;
e27f234a 3148 SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, SSL_R_BAD_SIGNATURE);
0f113f3e
MC		 3149 goto f_err;
3150 }
3151 } else
3152#ifndef OPENSSL_NO_RSA
3153 if (pkey->type == EVP_PKEY_RSA) {
3154 i = RSA_verify(NID_md5_sha1, s->s3->tmp.cert_verify_md,
f532a35d 3155 MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH, data, len,
0f113f3e
MC		 3156 pkey->pkey.rsa);
3157 if (i < 0) {
3158 al = SSL_AD_DECRYPT_ERROR;
e27f234a 3159 SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, SSL_R_BAD_RSA_DECRYPT);
0f113f3e
MC		 3160 goto f_err;
3161 }
3162 if (i == 0) {
3163 al = SSL_AD_DECRYPT_ERROR;
e27f234a 3164 SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, SSL_R_BAD_RSA_SIGNATURE);
0f113f3e
MC		 3165 goto f_err;
3166 }
3167 } else
d02b48c6 3168#endif
bc36ee62 3169#ifndef OPENSSL_NO_DSA
0f113f3e
MC		 3170 if (pkey->type == EVP_PKEY_DSA) {
3171 j = DSA_verify(pkey->save_type,
3172 &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
f532a35d 3173 SHA_DIGEST_LENGTH, data, len, pkey->pkey.dsa);
0f113f3e
MC		 3174 if (j <= 0) {
3175 /* bad signature */
3176 al = SSL_AD_DECRYPT_ERROR;
e27f234a 3177 SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, SSL_R_BAD_DSA_SIGNATURE);
0f113f3e
MC		 3178 goto f_err;
3179 }
3180 } else
ea262260 3181#endif
10bf4fc2 3182#ifndef OPENSSL_NO_EC
0f113f3e
MC		 3183 if (pkey->type == EVP_PKEY_EC) {
3184 j = ECDSA_verify(pkey->save_type,
3185 &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
f532a35d 3186 SHA_DIGEST_LENGTH, data, len, pkey->pkey.ec);
0f113f3e
MC		 3187 if (j <= 0) {
3188 /* bad signature */
3189 al = SSL_AD_DECRYPT_ERROR;
e27f234a 3190 SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, SSL_R_BAD_ECDSA_SIGNATURE);
0f113f3e
MC		 3191 goto f_err;
3192 }
3193 } else
d02b48c6 3194#endif
e44380a9 3195 {
e27f234a 3196 SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, ERR_R_INTERNAL_ERROR);
0f113f3e
MC		 3197 al = SSL_AD_UNSUPPORTED_CERTIFICATE;
3198 goto f_err;
3199 }
3200
c130dd8e 3201 ret = MSG_PROCESS_CONTINUE_PROCESSING;
0f113f3e
MC		 3202 if (0) {
3203 f_err:
3204 ssl3_send_alert(s, SSL3_AL_FATAL, al);
fe3a3291 3205 ossl_statem_set_error(s);
0f113f3e 3206 }
25aaa98a
RS		 3207 BIO_free(s->s3->handshake_buffer);
3208 s->s3->handshake_buffer = NULL;
0f113f3e
MC		 3209 EVP_MD_CTX_cleanup(&mctx);
3210 EVP_PKEY_free(pkey);
e27f234a 3211 return ret;
0f113f3e 3212}
d02b48c6 3213
be3583fa 3214MSG_PROCESS_RETURN tls_process_client_certificate(SSL *s, PACKET *pkt)
e27f234a 3215{
20dbe585 3216 int i, al = SSL_AD_INTERNAL_ERROR, ret = MSG_PROCESS_ERROR;
e27f234a
MC		 3217 X509 *x = NULL;
3218 unsigned long l, llen;
3219 const unsigned char *certstart;
3220 unsigned char *certbytes;
3221 STACK_OF(X509) *sk = NULL;
73999b62 3222 PACKET spkt;
0f113f3e
MC		 3223
3224 if ((sk = sk_X509_new_null()) == NULL) {
e27f234a
MC		 3225 SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE);
3226 goto f_err;
0f113f3e
MC		 3227 }
3228
73999b62
MC		 3229 if (!PACKET_get_net_3(pkt, &llen)
3230 || !PACKET_get_sub_packet(pkt, &spkt, llen)
3231 || PACKET_remaining(pkt) != 0) {
0f113f3e 3232 al = SSL_AD_DECODE_ERROR;
e27f234a 3233 SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, SSL_R_LENGTH_MISMATCH);
0f113f3e
MC		 3234 goto f_err;
3235 }
0bc09ecd
MC		 3236
3237 while (PACKET_remaining(&spkt) > 0) {
3238 if (!PACKET_get_net_3(&spkt, &l)
3239 || !PACKET_get_bytes(&spkt, &certbytes, l)) {
0f113f3e 3240 al = SSL_AD_DECODE_ERROR;
e27f234a 3241 SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE,
0f113f3e
MC		 3242 SSL_R_CERT_LENGTH_MISMATCH);
3243 goto f_err;
3244 }
3245
0bc09ecd
MC		 3246 certstart = certbytes;
3247 x = d2i_X509(NULL, (const unsigned char **)&certbytes, l);
0f113f3e 3248 if (x == NULL) {
e27f234a
MC		 3249 SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, ERR_R_ASN1_LIB);
3250 goto f_err;
0f113f3e 3251 }
0bc09ecd 3252 if (certbytes != (certstart + l)) {
0f113f3e 3253 al = SSL_AD_DECODE_ERROR;
e27f234a 3254 SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE,
0f113f3e
MC		 3255 SSL_R_CERT_LENGTH_MISMATCH);
3256 goto f_err;
3257 }
3258 if (!sk_X509_push(sk, x)) {
e27f234a
MC		 3259 SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE);
3260 goto f_err;
0f113f3e
MC		 3261 }
3262 x = NULL;
0f113f3e
MC		 3263 }
3264
3265 if (sk_X509_num(sk) <= 0) {
3266 /* TLS does not mind 0 certs returned */
3267 if (s->version == SSL3_VERSION) {
3268 al = SSL_AD_HANDSHAKE_FAILURE;
e27f234a 3269 SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE,
0f113f3e
MC		 3270 SSL_R_NO_CERTIFICATES_RETURNED);
3271 goto f_err;
3272 }
3273 /* Fail for TLS only if we required a certificate */
3274 else if ((s->verify_mode & SSL_VERIFY_PEER) &&
3275 (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) {
e27f234a 3276 SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE,
0f113f3e
MC		 3277 SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
3278 al = SSL_AD_HANDSHAKE_FAILURE;
3279 goto f_err;
3280 }
3281 /* No client certificate so digest cached records */
124037fd 3282 if (s->s3->handshake_buffer && !ssl3_digest_cached_records(s, 0)) {
0f113f3e
MC		 3283 goto f_err;
3284 }
3285 } else {
3286 EVP_PKEY *pkey;
3287 i = ssl_verify_cert_chain(s, sk);
3288 if (i <= 0) {
3289 al = ssl_verify_alarm_type(s->verify_result);
e27f234a 3290 SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE,
0f113f3e
MC		 3291 SSL_R_CERTIFICATE_VERIFY_FAILED);
3292 goto f_err;
3293 }
3294 if (i > 1) {
e27f234a 3295 SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, i);
0f113f3e
MC		 3296 al = SSL_AD_HANDSHAKE_FAILURE;
3297 goto f_err;
3298 }
3299 pkey = X509_get_pubkey(sk_X509_value(sk, 0));
3300 if (pkey == NULL) {
3301 al = SSL3_AD_HANDSHAKE_FAILURE;
e27f234a 3302 SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE,
0f113f3e
MC		 3303 SSL_R_UNKNOWN_CERTIFICATE_TYPE);
3304 goto f_err;
3305 }
3306 EVP_PKEY_free(pkey);
3307 }
3308
222561fe 3309 X509_free(s->session->peer);
0f113f3e
MC		 3310 s->session->peer = sk_X509_shift(sk);
3311 s->session->verify_result = s->verify_result;
3312
c34b0f99
DSH		 3313 sk_X509_pop_free(s->session->peer_chain, X509_free);
3314 s->session->peer_chain = sk;
0f113f3e
MC		 3315 /*
3316 * Inconsistency alert: cert_chain does *not* include the peer's own
3317 * certificate, while we do include it in s3_clnt.c
3318 */
0f113f3e 3319 sk = NULL;
e27f234a 3320 ret = MSG_PROCESS_CONTINUE_READING;
66696478
RS		 3321 goto done;
3322
0f113f3e 3323 f_err:
66696478 3324 ssl3_send_alert(s, SSL3_AL_FATAL, al);
fe3a3291 3325 ossl_statem_set_error(s);
66696478 3326 done:
222561fe
RS		 3327 X509_free(x);
3328 sk_X509_pop_free(sk, X509_free);
e27f234a 3329 return ret;
0f113f3e 3330}
d02b48c6 3331
e27f234a
MC		 3332int tls_construct_server_certificate(SSL *s)
3333{
3334 CERT_PKEY *cpk;
3335
3336 cpk = ssl_get_server_send_pkey(s);
3337 if (cpk == NULL) {
3338 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_CERTIFICATE, ERR_R_INTERNAL_ERROR);
fe3a3291 3339 ossl_statem_set_error(s);
e27f234a
MC		 3340 return 0;
3341 }
3342
3343 if (!ssl3_output_cert_chain(s, cpk)) {
3344 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_CERTIFICATE, ERR_R_INTERNAL_ERROR);
fe3a3291 3345 ossl_statem_set_error(s);
e27f234a
MC		 3346 return 0;
3347 }
3348
3349 return 1;
3350}
3351
e27f234a
MC		 3352int tls_construct_new_session_ticket(SSL *s)
3353{
3354 unsigned char *senc = NULL;
3355 EVP_CIPHER_CTX ctx;
3356 HMAC_CTX hctx;
3357 unsigned char *p, *macstart;
3358 const unsigned char *const_p;
3359 int len, slen_full, slen;
3360 SSL_SESSION *sess;
3361 unsigned int hlen;
3362 SSL_CTX *tctx = s->initial_ctx;
3363 unsigned char iv[EVP_MAX_IV_LENGTH];
3364 unsigned char key_name[16];
3365
3366 /* get session encoding length */
3367 slen_full = i2d_SSL_SESSION(s->session, NULL);
3368 /*
3369 * Some length values are 16 bits, so forget it if session is too
3370 * long
3371 */
3372 if (slen_full == 0 || slen_full > 0xFF00) {
fe3a3291 3373 ossl_statem_set_error(s);
e27f234a
MC		 3374 return 0;
3375 }
3376 senc = OPENSSL_malloc(slen_full);
a71edf3b 3377 if (senc == NULL) {
fe3a3291 3378 ossl_statem_set_error(s);
e27f234a
MC		 3379 return 0;
3380 }
0f113f3e 3381
e27f234a
MC		 3382 EVP_CIPHER_CTX_init(&ctx);
3383 HMAC_CTX_init(&hctx);
0f113f3e 3384
e27f234a
MC		 3385 p = senc;
3386 if (!i2d_SSL_SESSION(s->session, &p))
3387 goto err;
687eaf27 3388
e27f234a
MC		 3389 /*
3390 * create a fresh copy (not shared with other threads) to clean up
3391 */
3392 const_p = senc;
3393 sess = d2i_SSL_SESSION(NULL, &const_p, slen_full);
3394 if (sess == NULL)
3395 goto err;
3396 sess->session_id_length = 0; /* ID is irrelevant for the ticket */
0f113f3e 3397
e27f234a
MC		 3398 slen = i2d_SSL_SESSION(sess, NULL);
3399 if (slen == 0 || slen > slen_full) { /* shouldn't ever happen */
3400 SSL_SESSION_free(sess);
3401 goto err;
3402 }
3403 p = senc;
3404 if (!i2d_SSL_SESSION(sess, &p)) {
3405 SSL_SESSION_free(sess);
3406 goto err;
3407 }
3408 SSL_SESSION_free(sess);
0f113f3e 3409
e27f234a
MC		 3410 /*-
3411 * Grow buffer if need be: the length calculation is as
3412 * follows handshake_header_length +
3413 * 4 (ticket lifetime hint) + 2 (ticket length) +
3414 * 16 (key name) + max_iv_len (iv length) +
3415 * session_length + max_enc_block_size (max encrypted session
3416 * length) + max_md_size (HMAC).
3417 */
3418 if (!BUF_MEM_grow(s->init_buf,
3419 SSL_HM_HEADER_LENGTH(s) + 22 + EVP_MAX_IV_LENGTH +
3420 EVP_MAX_BLOCK_LENGTH + EVP_MAX_MD_SIZE + slen))
3421 goto err;
0f113f3e 3422
e27f234a
MC		 3423 p = ssl_handshake_start(s);
3424 /*
3425 * Initialize HMAC and cipher contexts. If callback present it does
3426 * all the work otherwise use generated values from parent ctx.
3427 */
3428 if (tctx->tlsext_ticket_key_cb) {
3429 if (tctx->tlsext_ticket_key_cb(s, key_name, iv, &ctx,
3430 &hctx, 1) < 0)
3431 goto err;
3432 } else {
3433 if (RAND_bytes(iv, 16) <= 0)
687eaf27 3434 goto err;
e27f234a
MC		 3435 if (!EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
3436 tctx->tlsext_tick_aes_key, iv))
687eaf27 3437 goto err;
e27f234a
MC		 3438 if (!HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
3439 EVP_sha256(), NULL))
4f9fab6b 3440 goto err;
e27f234a 3441 memcpy(key_name, tctx->tlsext_tick_key_name, 16);
0f113f3e
MC		 3442 }
3443
e27f234a
MC		 3444 /*
3445 * Ticket lifetime hint (advisory only): We leave this unspecified
3446 * for resumed session (for simplicity), and guess that tickets for
3447 * new sessions will live as long as their sessions.
3448 */
3449 l2n(s->hit ? 0 : s->session->timeout, p);
3450
3451 /* Skip ticket length for now */
3452 p += 2;
3453 /* Output key name */
3454 macstart = p;
3455 memcpy(p, key_name, 16);
3456 p += 16;
3457 /* output IV */
3458 memcpy(p, iv, EVP_CIPHER_CTX_iv_length(&ctx));
3459 p += EVP_CIPHER_CTX_iv_length(&ctx);
3460 /* Encrypt session data */
3461 if (!EVP_EncryptUpdate(&ctx, p, &len, senc, slen))
3462 goto err;
3463 p += len;
3464 if (!EVP_EncryptFinal(&ctx, p, &len))
3465 goto err;
3466 p += len;
3467
3468 if (!HMAC_Update(&hctx, macstart, p - macstart))
3469 goto err;
3470 if (!HMAC_Final(&hctx, p, &hlen))
3471 goto err;
3472
3473 EVP_CIPHER_CTX_cleanup(&ctx);
3474 HMAC_CTX_cleanup(&hctx);
3475
3476 p += hlen;
3477 /* Now write out lengths: p points to end of data written */
3478 /* Total length */
3479 len = p - ssl_handshake_start(s);
3480 /* Skip ticket lifetime hint */
3481 p = ssl_handshake_start(s) + 4;
3482 s2n(len - 6, p);
3483 if (!ssl_set_handshake_header(s, SSL3_MT_NEWSESSION_TICKET, len))
3484 goto err;
3485 OPENSSL_free(senc);
3486
3487 return 1;
687eaf27 3488 err:
b548a1f1 3489 OPENSSL_free(senc);
687eaf27
MC		 3490 EVP_CIPHER_CTX_cleanup(&ctx);
3491 HMAC_CTX_cleanup(&hctx);
fe3a3291 3492 ossl_statem_set_error(s);
e27f234a 3493 return 0;
0f113f3e 3494}
67c8e7f4 3495
e27f234a
MC		 3496int tls_construct_cert_status(SSL *s)
3497{
3498 unsigned char *p;
3499 /*-
3500 * Grow buffer if need be: the length calculation is as
3501 * follows 1 (message type) + 3 (message length) +
3502 * 1 (ocsp response type) + 3 (ocsp response length)
3503 * + (ocsp response)
3504 */
3505 if (!BUF_MEM_grow(s->init_buf, 8 + s->tlsext_ocsp_resplen)) {
fe3a3291 3506 ossl_statem_set_error(s);
e27f234a
MC		 3507 return 0;
3508 }
3509
3510 p = (unsigned char *)s->init_buf->data;
3511
3512 /* do the header */
3513 *(p++) = SSL3_MT_CERTIFICATE_STATUS;
3514 /* message length */
3515 l2n3(s->tlsext_ocsp_resplen + 4, p);
3516 /* status type */
3517 *(p++) = s->tlsext_status_type;
3518 /* length of OCSP response */
3519 l2n3(s->tlsext_ocsp_resplen, p);
3520 /* actual response */
3521 memcpy(p, s->tlsext_ocsp_resp, s->tlsext_ocsp_resplen);
3522 /* number of bytes to write */
3523 s->init_num = 8 + s->tlsext_ocsp_resplen;
3524 s->init_off = 0;
3525
3526 return 1;
3527}
3528
e481f9b9 3529#ifndef OPENSSL_NO_NEXTPROTONEG
e27f234a
MC		 3530/*
3531 * tls_process_next_proto reads a Next Protocol Negotiation handshake message.
3532 * It sets the next_proto member in s if found
3533 */
be3583fa 3534MSG_PROCESS_RETURN tls_process_next_proto(SSL *s, PACKET *pkt)
e27f234a 3535{
73999b62 3536 PACKET next_proto, padding;
e27f234a
MC		 3537 size_t next_proto_len;
3538
50e735f9
MC		 3539 /*-
3540 * The payload looks like:
3541 * uint8 proto_len;
3542 * uint8 proto[proto_len];
3543 * uint8 padding_len;
3544 * uint8 padding[padding_len];
3545 */
73999b62
MC		 3546 if (!PACKET_get_length_prefixed_1(pkt, &next_proto)
3547 || !PACKET_get_length_prefixed_1(pkt, &padding)
3548 || PACKET_remaining(pkt) > 0) {
e27f234a 3549 SSLerr(SSL_F_TLS_PROCESS_NEXT_PROTO, SSL_R_LENGTH_MISMATCH);
c3fc7eea 3550 goto err;
cf9b0b6f 3551 }
0f113f3e 3552
6d41fc80
EK		 3553 if (!PACKET_memdup(&next_proto, &s->next_proto_negotiated,
3554 &next_proto_len)) {
3555 s->next_proto_negotiated_len = 0;
c3fc7eea
MC		 3556 goto err;
3557 }
3558
6d41fc80 3559 s->next_proto_negotiated_len = (unsigned char)next_proto_len;
0f113f3e 3560
e27f234a 3561 return MSG_PROCESS_CONTINUE_READING;
c3fc7eea 3562err:
fe3a3291 3563 ossl_statem_set_error(s);
e27f234a 3564 return MSG_PROCESS_ERROR;
0f113f3e 3565}
6434abbf 3566#endif
d45ba43d
MC		 3567
3568#define SSLV2_CIPHER_LEN 3
3569
38a3cbfb
EK		 3570STACK_OF(SSL_CIPHER) *ssl_bytes_to_cipher_list(SSL *s,
3571 PACKET *cipher_suites,
d45ba43d 3572 STACK_OF(SSL_CIPHER) **skp,
38a3cbfb
EK		 3573 int sslv2format, int *al
3574 )
d45ba43d
MC		 3575{
3576 const SSL_CIPHER *c;
3577 STACK_OF(SSL_CIPHER) *sk;
38a3cbfb
EK		 3578 int n;
3579 /* 3 = SSLV2_CIPHER_LEN > TLS_CIPHER_LEN = 2. */
3580 unsigned char cipher[SSLV2_CIPHER_LEN];
d45ba43d 3581
38a3cbfb
EK		 3582 s->s3->send_connection_binding = 0;
3583
3584 n = sslv2format ? SSLV2_CIPHER_LEN : TLS_CIPHER_LEN;
3585
3586 if (PACKET_remaining(cipher_suites) == 0) {
3587 SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST, SSL_R_NO_CIPHERS_SPECIFIED);
3588 *al = SSL_AD_ILLEGAL_PARAMETER;
3589 return NULL;
d45ba43d 3590 }
38a3cbfb
EK		 3591
3592 if (PACKET_remaining(cipher_suites) % n != 0) {
d45ba43d
MC		 3593 SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST,
3594 SSL_R_ERROR_IN_RECEIVED_CIPHER_LIST);
38a3cbfb
EK		 3595 *al = SSL_AD_DECODE_ERROR;
3596 return NULL;
d45ba43d 3597 }
38a3cbfb 3598
d45ba43d
MC		 3599 if ((skp == NULL) || (*skp == NULL)) {
3600 sk = sk_SSL_CIPHER_new_null(); /* change perhaps later */
3601 if(sk == NULL) {
3602 SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST, ERR_R_MALLOC_FAILURE);
38a3cbfb 3603 *al = SSL_AD_INTERNAL_ERROR;
d45ba43d
MC		 3604 return NULL;
3605 }
3606 } else {
3607 sk = *skp;
3608 sk_SSL_CIPHER_zero(sk);
3609 }
3610
38a3cbfb
EK		 3611 if (!PACKET_memdup(cipher_suites, &s->s3->tmp.ciphers_raw,
3612 &s->s3->tmp.ciphers_rawlen)) {
3613 *al = SSL_AD_INTERNAL_ERROR;
d45ba43d
MC		 3614 goto err;
3615 }
d45ba43d 3616
38a3cbfb
EK		 3617 while (PACKET_copy_bytes(cipher_suites, cipher, n)) {
3618 /*
20218b58
EK		 3619 * SSLv3 ciphers wrapped in an SSLv2-compatible ClientHello have the
3620 * first byte set to zero, while true SSLv2 ciphers have a non-zero
3621 * first byte. We don't support any true SSLv2 ciphers, so skip them.
38a3cbfb
EK		 3622 */
3623 if (sslv2format && cipher[0] != '\0')
3624 continue;
3625
d45ba43d 3626 /* Check for TLS_EMPTY_RENEGOTIATION_INFO_SCSV */
38a3cbfb
EK		 3627 if ((cipher[n - 2] == ((SSL3_CK_SCSV >> 8) & 0xff)) &&
3628 (cipher[n - 1] == (SSL3_CK_SCSV & 0xff))) {
d45ba43d
MC		 3629 /* SCSV fatal if renegotiating */
3630 if (s->renegotiate) {
3631 SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST,
3632 SSL_R_SCSV_RECEIVED_WHEN_RENEGOTIATING);
38a3cbfb 3633 *al = SSL_AD_HANDSHAKE_FAILURE;
d45ba43d
MC		 3634 goto err;
3635 }
3636 s->s3->send_connection_binding = 1;
d45ba43d
MC		 3637#ifdef OPENSSL_RI_DEBUG
3638 fprintf(stderr, "SCSV received by server\n");
3639#endif
3640 continue;
3641 }
3642
3643 /* Check for TLS_FALLBACK_SCSV */
38a3cbfb
EK		 3644 if ((cipher[n - 2] == ((SSL3_CK_FALLBACK_SCSV >> 8) & 0xff)) &&
3645 (cipher[n - 1] == (SSL3_CK_FALLBACK_SCSV & 0xff))) {
d45ba43d
MC		 3646 /*
3647 * The SCSV indicates that the client previously tried a higher
3648 * version. Fail if the current version is an unexpected
3649 * downgrade.
3650 */
3651 if (!SSL_ctrl(s, SSL_CTRL_CHECK_PROTO_VERSION, 0, NULL)) {
3652 SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST,
3653 SSL_R_INAPPROPRIATE_FALLBACK);
38a3cbfb 3654 *al = SSL_AD_INAPPROPRIATE_FALLBACK;
d45ba43d
MC		 3655 goto err;
3656 }
d45ba43d
MC		 3657 continue;
3658 }
3659
38a3cbfb
EK		 3660 /* For SSLv2-compat, ignore leading 0-byte. */
3661 c = ssl_get_cipher_by_char(s, sslv2format ? &cipher[1] : cipher);
d45ba43d
MC		 3662 if (c != NULL) {
3663 if (!sk_SSL_CIPHER_push(sk, c)) {
3664 SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST, ERR_R_MALLOC_FAILURE);
38a3cbfb 3665 *al = SSL_AD_INTERNAL_ERROR;
d45ba43d
MC		 3666 goto err;
3667 }
3668 }
3669 }
38a3cbfb
EK		 3670 if (PACKET_remaining(cipher_suites) > 0) {
3671 *al = SSL_AD_INTERNAL_ERROR;
3672 SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST, ERR_R_INTERNAL_ERROR);
3673 goto err;
3674 }
d45ba43d
MC		 3675
3676 if (skp != NULL)
3677 *skp = sk;
3678 return (sk);
3679 err:
3680 if ((skp == NULL) || (*skp == NULL))
3681 sk_SSL_CIPHER_free(sk);
38a3cbfb 3682 return NULL;
d45ba43d 3683}
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