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Unleashed v1.4
[unleashed.git] / lib / libssl / ssl_srvr.c
blobe046438cc04800a728d4634944418300a62c7e06
1 /* $OpenBSD: ssl_srvr.c,v 1.48 2018/08/27 17:04:34 jsing Exp $ */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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.
8 *
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).
15 *
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.
22 *
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 :-).
37 * 4. If you include any Windows specific code (or a derivative thereof) from
38 * the apps directory (application code) you must include an acknowledgement:
39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40 *
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.
52 *
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 */
58 /* ====================================================================
59 * Copyright (c) 1998-2007 The OpenSSL Project. All rights reserved.
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
66 * notice, this list of conditions and the following disclaimer.
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 */
111 /* ====================================================================
112 * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
113 *
114 * Portions of the attached software ("Contribution") are developed by
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 *
120 * ECC cipher suite support in OpenSSL originally written by
121 * Vipul Gupta and Sumit Gupta of Sun Microsystems Laboratories.
122 *
123 */
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 */
150
151 #include <stdio.h>
152
153 #include "ssl_locl.h"
154
155 #include <openssl/bn.h>
156 #include <openssl/buffer.h>
157 #include <openssl/curve25519.h>
158 #include <openssl/evp.h>
159 #include <openssl/dh.h>
160 #ifndef OPENSSL_NO_GOST
161 #include <openssl/gost.h>
162 #endif
163 #include <openssl/hmac.h>
164 #include <openssl/md5.h>
165 #include <openssl/objects.h>
166 #include <openssl/x509.h>
167
168 #include "bytestring.h"
169 #include "ssl_tlsext.h"
170
171 int
172 ssl3_accept(SSL *s)
173 {
174 void (*cb)(const SSL *ssl, int type, int val) = NULL;
175 unsigned long alg_k;
176 int ret = -1;
177 int new_state, state, skip = 0;
178 int listen = 0;
179
180 ERR_clear_error();
181 errno = 0;
182
183 if (s->internal->info_callback != NULL)
184 cb = s->internal->info_callback;
185 else if (s->ctx->internal->info_callback != NULL)
186 cb = s->ctx->internal->info_callback;
187
188 if (SSL_IS_DTLS(s))
189 listen = D1I(s)->listen;
190
191 /* init things to blank */
192 s->internal->in_handshake++;
193 if (!SSL_in_init(s) || SSL_in_before(s))
194 SSL_clear(s);
195
196 if (SSL_IS_DTLS(s))
197 D1I(s)->listen = listen;
198
199 if (s->cert == NULL) {
200 SSLerror(s, SSL_R_NO_CERTIFICATE_SET);
201 ret = -1;
202 goto end;
203 }
204
205 for (;;) {
206 state = S3I(s)->hs.state;
207
208 switch (S3I(s)->hs.state) {
209 case SSL_ST_RENEGOTIATE:
210 s->internal->renegotiate = 1;
211 /* S3I(s)->hs.state=SSL_ST_ACCEPT; */
212
213 case SSL_ST_BEFORE:
214 case SSL_ST_ACCEPT:
215 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
216 case SSL_ST_OK|SSL_ST_ACCEPT:
217 s->server = 1;
218 if (cb != NULL)
219 cb(s, SSL_CB_HANDSHAKE_START, 1);
220
221 if (SSL_IS_DTLS(s)) {
222 if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00)) {
223 SSLerror(s, ERR_R_INTERNAL_ERROR);
224 ret = -1;
225 goto end;
226 }
227 } else {
228 if ((s->version >> 8) != 3) {
229 SSLerror(s, ERR_R_INTERNAL_ERROR);
230 ret = -1;
231 goto end;
232 }
233 }
234 s->internal->type = SSL_ST_ACCEPT;
235
236 if (!ssl3_setup_init_buffer(s)) {
237 ret = -1;
238 goto end;
239 }
240 if (!ssl3_setup_buffers(s)) {
241 ret = -1;
242 goto end;
243 }
244
245 s->internal->init_num = 0;
246
247 if (S3I(s)->hs.state != SSL_ST_RENEGOTIATE) {
248 /*
249 * Ok, we now need to push on a buffering BIO
250 * so that the output is sent in a way that
251 * TCP likes :-)
252 */
253 if (!ssl_init_wbio_buffer(s, 1)) {
254 ret = -1;
255 goto end;
256 }
257 if (!tls1_init_finished_mac(s)) {
258 ret = -1;
259 goto end;
260 }
261
262 S3I(s)->hs.state = SSL3_ST_SR_CLNT_HELLO_A;
263 s->ctx->internal->stats.sess_accept++;
264 } else if (!SSL_IS_DTLS(s) && !S3I(s)->send_connection_binding) {
265 /*
266 * Server attempting to renegotiate with
267 * client that doesn't support secure
268 * renegotiation.
269 */
270 SSLerror(s, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
271 ssl3_send_alert(s, SSL3_AL_FATAL,
272 SSL_AD_HANDSHAKE_FAILURE);
273 ret = -1;
274 goto end;
275 } else {
276 /*
277 * S3I(s)->hs.state == SSL_ST_RENEGOTIATE,
278 * we will just send a HelloRequest.
279 */
280 s->ctx->internal->stats.sess_accept_renegotiate++;
281 S3I(s)->hs.state = SSL3_ST_SW_HELLO_REQ_A;
282 }
283 break;
284
285 case SSL3_ST_SW_HELLO_REQ_A:
286 case SSL3_ST_SW_HELLO_REQ_B:
287 s->internal->shutdown = 0;
288 if (SSL_IS_DTLS(s)) {
289 dtls1_clear_record_buffer(s);
290 dtls1_start_timer(s);
291 }
292 ret = ssl3_send_hello_request(s);
293 if (ret <= 0)
294 goto end;
295 if (SSL_IS_DTLS(s))
296 S3I(s)->hs.next_state = SSL3_ST_SR_CLNT_HELLO_A;
297 else
298 S3I(s)->hs.next_state = SSL3_ST_SW_HELLO_REQ_C;
299 S3I(s)->hs.state = SSL3_ST_SW_FLUSH;
300 s->internal->init_num = 0;
301
302 if (!tls1_init_finished_mac(s)) {
303 ret = -1;
304 goto end;
305 }
306 break;
307
308 case SSL3_ST_SW_HELLO_REQ_C:
309 S3I(s)->hs.state = SSL_ST_OK;
310 break;
311
312 case SSL3_ST_SR_CLNT_HELLO_A:
313 case SSL3_ST_SR_CLNT_HELLO_B:
314 case SSL3_ST_SR_CLNT_HELLO_C:
315 s->internal->shutdown = 0;
316 if (SSL_IS_DTLS(s)) {
317 ret = ssl3_get_client_hello(s);
318 if (ret <= 0)
319 goto end;
320 dtls1_stop_timer(s);
321
322 if (ret == 1 &&
323 (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE))
324 S3I(s)->hs.state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A;
325 else
326 S3I(s)->hs.state = SSL3_ST_SW_SRVR_HELLO_A;
327
328 s->internal->init_num = 0;
329
330 /*
331 * Reflect ClientHello sequence to remain
332 * stateless while listening.
333 */
334 if (listen) {
335 memcpy(S3I(s)->write_sequence,
336 S3I(s)->read_sequence,
337 sizeof(S3I(s)->write_sequence));
338 }
339
340 /* If we're just listening, stop here */
341 if (listen && S3I(s)->hs.state == SSL3_ST_SW_SRVR_HELLO_A) {
342 ret = 2;
343 D1I(s)->listen = 0;
344 /*
345 * Set expected sequence numbers to
346 * continue the handshake.
347 */
348 D1I(s)->handshake_read_seq = 2;
349 D1I(s)->handshake_write_seq = 1;
350 D1I(s)->next_handshake_write_seq = 1;
351 goto end;
352 }
353 } else {
354 if (s->internal->rwstate != SSL_X509_LOOKUP) {
355 ret = ssl3_get_client_hello(s);
356 if (ret <= 0)
357 goto end;
358 }
359
360 s->internal->renegotiate = 2;
361 S3I(s)->hs.state = SSL3_ST_SW_SRVR_HELLO_A;
362 s->internal->init_num = 0;
363 }
364 break;
365
366 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A:
367 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B:
368 ret = dtls1_send_hello_verify_request(s);
369 if (ret <= 0)
370 goto end;
371 S3I(s)->hs.state = SSL3_ST_SW_FLUSH;
372 S3I(s)->hs.next_state = SSL3_ST_SR_CLNT_HELLO_A;
373
374 /* HelloVerifyRequest resets Finished MAC. */
375 if (!tls1_init_finished_mac(s)) {
376 ret = -1;
377 goto end;
378 }
379 break;
380
381 case SSL3_ST_SW_SRVR_HELLO_A:
382 case SSL3_ST_SW_SRVR_HELLO_B:
383 if (SSL_IS_DTLS(s)) {
384 s->internal->renegotiate = 2;
385 dtls1_start_timer(s);
386 }
387 ret = ssl3_send_server_hello(s);
388 if (ret <= 0)
389 goto end;
390 if (s->internal->hit) {
391 if (s->internal->tlsext_ticket_expected)
392 S3I(s)->hs.state = SSL3_ST_SW_SESSION_TICKET_A;
393 else
394 S3I(s)->hs.state = SSL3_ST_SW_CHANGE_A;
395 } else {
396 S3I(s)->hs.state = SSL3_ST_SW_CERT_A;
397 }
398 s->internal->init_num = 0;
399 break;
400
401 case SSL3_ST_SW_CERT_A:
402 case SSL3_ST_SW_CERT_B:
403 /* Check if it is anon DH or anon ECDH. */
404 if (!(S3I(s)->hs.new_cipher->algorithm_auth &
405 SSL_aNULL)) {
406 if (SSL_IS_DTLS(s))
407 dtls1_start_timer(s);
408 ret = ssl3_send_server_certificate(s);
409 if (ret <= 0)
410 goto end;
411 if (s->internal->tlsext_status_expected)
412 S3I(s)->hs.state = SSL3_ST_SW_CERT_STATUS_A;
413 else
414 S3I(s)->hs.state = SSL3_ST_SW_KEY_EXCH_A;
415 } else {
416 skip = 1;
417 S3I(s)->hs.state = SSL3_ST_SW_KEY_EXCH_A;
418 }
419 s->internal->init_num = 0;
420 break;
421
422 case SSL3_ST_SW_KEY_EXCH_A:
423 case SSL3_ST_SW_KEY_EXCH_B:
424 alg_k = S3I(s)->hs.new_cipher->algorithm_mkey;
425
426 /*
427 * Only send if using a DH key exchange.
428 *
429 * For ECC ciphersuites, we send a ServerKeyExchange
430 * message only if the cipher suite is ECDHE. In other
431 * cases, the server certificate contains the server's
432 * public key for key exchange.
433 */
434 if (alg_k & (SSL_kDHE|SSL_kECDHE)) {
435 if (SSL_IS_DTLS(s))
436 dtls1_start_timer(s);
437 ret = ssl3_send_server_key_exchange(s);
438 if (ret <= 0)
439 goto end;
440 } else
441 skip = 1;
442
443 S3I(s)->hs.state = SSL3_ST_SW_CERT_REQ_A;
444 s->internal->init_num = 0;
445 break;
446
447 case SSL3_ST_SW_CERT_REQ_A:
448 case SSL3_ST_SW_CERT_REQ_B:
449 /*
450 * Determine whether or not we need to request a
451 * certificate.
452 *
453 * Do not request a certificate if:
454 *
455 * - We did not ask for it (SSL_VERIFY_PEER is unset).
456 *
457 * - SSL_VERIFY_CLIENT_ONCE is set and we are
458 * renegotiating.
459 *
460 * - We are using an anonymous ciphersuites
461 * (see section "Certificate request" in SSL 3 drafts
462 * and in RFC 2246) ... except when the application
463 * insists on verification (against the specs, but
464 * s3_clnt.c accepts this for SSL 3).
465 */
466 if (!(s->verify_mode & SSL_VERIFY_PEER) ||
467 ((s->session->peer != NULL) &&
468 (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
469 ((S3I(s)->hs.new_cipher->algorithm_auth &
470 SSL_aNULL) && !(s->verify_mode &
471 SSL_VERIFY_FAIL_IF_NO_PEER_CERT))) {
472 /* No cert request. */
473 skip = 1;
474 S3I(s)->tmp.cert_request = 0;
475 S3I(s)->hs.state = SSL3_ST_SW_SRVR_DONE_A;
476 if (!SSL_IS_DTLS(s) && S3I(s)->handshake_buffer) {
477 if (!tls1_digest_cached_records(s)) {
478 ret = -1;
479 goto end;
480 }
481 }
482 } else {
483 S3I(s)->tmp.cert_request = 1;
484 if (SSL_IS_DTLS(s))
485 dtls1_start_timer(s);
486 ret = ssl3_send_certificate_request(s);
487 if (ret <= 0)
488 goto end;
489 S3I(s)->hs.state = SSL3_ST_SW_SRVR_DONE_A;
490 s->internal->init_num = 0;
491 }
492 break;
493
494 case SSL3_ST_SW_SRVR_DONE_A:
495 case SSL3_ST_SW_SRVR_DONE_B:
496 if (SSL_IS_DTLS(s))
497 dtls1_start_timer(s);
498 ret = ssl3_send_server_done(s);
499 if (ret <= 0)
500 goto end;
501 S3I(s)->hs.next_state = SSL3_ST_SR_CERT_A;
502 S3I(s)->hs.state = SSL3_ST_SW_FLUSH;
503 s->internal->init_num = 0;
504 break;
505
506 case SSL3_ST_SW_FLUSH:
507 /*
508 * This code originally checked to see if
509 * any data was pending using BIO_CTRL_INFO
510 * and then flushed. This caused problems
511 * as documented in PR#1939. The proposed
512 * fix doesn't completely resolve this issue
513 * as buggy implementations of BIO_CTRL_PENDING
514 * still exist. So instead we just flush
515 * unconditionally.
516 */
517 s->internal->rwstate = SSL_WRITING;
518 if (BIO_flush(s->wbio) <= 0) {
519 if (SSL_IS_DTLS(s)) {
520 /* If the write error was fatal, stop trying. */
521 if (!BIO_should_retry(s->wbio)) {
522 s->internal->rwstate = SSL_NOTHING;
523 S3I(s)->hs.state = S3I(s)->hs.next_state;
524 }
525 }
526 ret = -1;
527 goto end;
528 }
529 s->internal->rwstate = SSL_NOTHING;
530 S3I(s)->hs.state = S3I(s)->hs.next_state;
531 break;
532
533 case SSL3_ST_SR_CERT_A:
534 case SSL3_ST_SR_CERT_B:
535 if (S3I(s)->tmp.cert_request) {
536 ret = ssl3_get_client_certificate(s);
537 if (ret <= 0)
538 goto end;
539 }
540 s->internal->init_num = 0;
541 S3I(s)->hs.state = SSL3_ST_SR_KEY_EXCH_A;
542 break;
543
544 case SSL3_ST_SR_KEY_EXCH_A:
545 case SSL3_ST_SR_KEY_EXCH_B:
546 ret = ssl3_get_client_key_exchange(s);
547 if (ret <= 0)
548 goto end;
549
550 if (SSL_IS_DTLS(s)) {
551 S3I(s)->hs.state = SSL3_ST_SR_CERT_VRFY_A;
552 s->internal->init_num = 0;
553 }
554
555 alg_k = S3I(s)->hs.new_cipher->algorithm_mkey;
556 if (ret == 2) {
557 /*
558 * For the ECDH ciphersuites when
559 * the client sends its ECDH pub key in
560 * a certificate, the CertificateVerify
561 * message is not sent.
562 * Also for GOST ciphersuites when
563 * the client uses its key from the certificate
564 * for key exchange.
565 */
566 S3I(s)->hs.state = SSL3_ST_SR_FINISHED_A;
567 s->internal->init_num = 0;
568 } else if (SSL_USE_SIGALGS(s) || (alg_k & SSL_kGOST)) {
569 S3I(s)->hs.state = SSL3_ST_SR_CERT_VRFY_A;
570 s->internal->init_num = 0;
571 if (!s->session->peer)
572 break;
573 /*
574 * For sigalgs freeze the handshake buffer
575 * at this point and digest cached records.
576 */
577 if (!S3I(s)->handshake_buffer) {
578 SSLerror(s, ERR_R_INTERNAL_ERROR);
579 ret = -1;
580 goto end;
581 }
582 s->s3->flags |= TLS1_FLAGS_KEEP_HANDSHAKE;
583 if (!tls1_digest_cached_records(s)) {
584 ret = -1;
585 goto end;
586 }
587 } else {
588 S3I(s)->hs.state = SSL3_ST_SR_CERT_VRFY_A;
589 s->internal->init_num = 0;
590
591 /*
592 * We need to get hashes here so if there is
593 * a client cert, it can be verified.
594 */
595 if (S3I(s)->handshake_buffer) {
596 if (!tls1_digest_cached_records(s)) {
597 ret = -1;
598 goto end;
599 }
600 }
601 if (!tls1_handshake_hash_value(s,
602 S3I(s)->tmp.cert_verify_md,
603 sizeof(S3I(s)->tmp.cert_verify_md),
604 NULL)) {
605 ret = -1;
606 goto end;
607 }
608 }
609 break;
610
611 case SSL3_ST_SR_CERT_VRFY_A:
612 case SSL3_ST_SR_CERT_VRFY_B:
613 if (SSL_IS_DTLS(s))
614 D1I(s)->change_cipher_spec_ok = 1;
615 else
616 s->s3->flags |= SSL3_FLAGS_CCS_OK;
617
618 /* we should decide if we expected this one */
619 ret = ssl3_get_cert_verify(s);
620 if (ret <= 0)
621 goto end;
622 S3I(s)->hs.state = SSL3_ST_SR_FINISHED_A;
623 s->internal->init_num = 0;
624 break;
625
626 case SSL3_ST_SR_FINISHED_A:
627 case SSL3_ST_SR_FINISHED_B:
628 if (SSL_IS_DTLS(s))
629 D1I(s)->change_cipher_spec_ok = 1;
630 else
631 s->s3->flags |= SSL3_FLAGS_CCS_OK;
632 ret = ssl3_get_finished(s, SSL3_ST_SR_FINISHED_A,
633 SSL3_ST_SR_FINISHED_B);
634 if (ret <= 0)
635 goto end;
636 if (SSL_IS_DTLS(s))
637 dtls1_stop_timer(s);
638 if (s->internal->hit)
639 S3I(s)->hs.state = SSL_ST_OK;
640 else if (s->internal->tlsext_ticket_expected)
641 S3I(s)->hs.state = SSL3_ST_SW_SESSION_TICKET_A;
642 else
643 S3I(s)->hs.state = SSL3_ST_SW_CHANGE_A;
644 s->internal->init_num = 0;
645 break;
646
647 case SSL3_ST_SW_SESSION_TICKET_A:
648 case SSL3_ST_SW_SESSION_TICKET_B:
649 ret = ssl3_send_newsession_ticket(s);
650 if (ret <= 0)
651 goto end;
652 S3I(s)->hs.state = SSL3_ST_SW_CHANGE_A;
653 s->internal->init_num = 0;
654 break;
655
656 case SSL3_ST_SW_CERT_STATUS_A:
657 case SSL3_ST_SW_CERT_STATUS_B:
658 ret = ssl3_send_cert_status(s);
659 if (ret <= 0)
660 goto end;
661 S3I(s)->hs.state = SSL3_ST_SW_KEY_EXCH_A;
662 s->internal->init_num = 0;
663 break;
664
665 case SSL3_ST_SW_CHANGE_A:
666 case SSL3_ST_SW_CHANGE_B:
667 s->session->cipher = S3I(s)->hs.new_cipher;
668 if (!tls1_setup_key_block(s)) {
669 ret = -1;
670 goto end;
671 }
672
673 ret = ssl3_send_change_cipher_spec(s,
674 SSL3_ST_SW_CHANGE_A, SSL3_ST_SW_CHANGE_B);
675 if (ret <= 0)
676 goto end;
677 S3I(s)->hs.state = SSL3_ST_SW_FINISHED_A;
678 s->internal->init_num = 0;
679
680 if (!tls1_change_cipher_state(s,
681 SSL3_CHANGE_CIPHER_SERVER_WRITE)) {
682 ret = -1;
683 goto end;
684 }
685
686 if (SSL_IS_DTLS(s))
687 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
688 break;
689
690 case SSL3_ST_SW_FINISHED_A:
691 case SSL3_ST_SW_FINISHED_B:
692 ret = ssl3_send_finished(s,
693 SSL3_ST_SW_FINISHED_A, SSL3_ST_SW_FINISHED_B,
694 TLS_MD_SERVER_FINISH_CONST,
695 TLS_MD_SERVER_FINISH_CONST_SIZE);
696 if (ret <= 0)
697 goto end;
698 S3I(s)->hs.state = SSL3_ST_SW_FLUSH;
699 if (s->internal->hit)
700 S3I(s)->hs.next_state = SSL3_ST_SR_FINISHED_A;
701 else
702 S3I(s)->hs.next_state = SSL_ST_OK;
703 s->internal->init_num = 0;
704 break;
705
706 case SSL_ST_OK:
707 /* clean a few things up */
708 tls1_cleanup_key_block(s);
709
710 if (!SSL_IS_DTLS(s)) {
711 BUF_MEM_free(s->internal->init_buf);
712 s->internal->init_buf = NULL;
713 }
714
715 /* remove buffering on output */
716 ssl_free_wbio_buffer(s);
717
718 s->internal->init_num = 0;
719
720 /* Skipped if we just sent a HelloRequest. */
721 if (s->internal->renegotiate == 2) {
722 s->internal->renegotiate = 0;
723 s->internal->new_session = 0;
724
725 ssl_update_cache(s, SSL_SESS_CACHE_SERVER);
726
727 s->ctx->internal->stats.sess_accept_good++;
728 /* s->server=1; */
729 s->internal->handshake_func = ssl3_accept;
730
731 if (cb != NULL)
732 cb(s, SSL_CB_HANDSHAKE_DONE, 1);
733 }
734
735 ret = 1;
736
737 if (SSL_IS_DTLS(s)) {
738 /* Done handshaking, next message is client hello. */
739 D1I(s)->handshake_read_seq = 0;
740 /* Next message is server hello. */
741 D1I(s)->handshake_write_seq = 0;
742 D1I(s)->next_handshake_write_seq = 0;
743 }
744 goto end;
745 /* break; */
746
747 default:
748 SSLerror(s, SSL_R_UNKNOWN_STATE);
749 ret = -1;
750 goto end;
751 /* break; */
752 }
753
754 if (!S3I(s)->tmp.reuse_message && !skip) {
755 if (s->internal->debug) {
756 if ((ret = BIO_flush(s->wbio)) <= 0)
757 goto end;
758 }
759
760
761 if ((cb != NULL) && (S3I(s)->hs.state != state)) {
762 new_state = S3I(s)->hs.state;
763 S3I(s)->hs.state = state;
764 cb(s, SSL_CB_ACCEPT_LOOP, 1);
765 S3I(s)->hs.state = new_state;
766 }
767 }
768 skip = 0;
769 }
770 end:
771 /* BIO_flush(s->wbio); */
772 s->internal->in_handshake--;
773 if (cb != NULL)
774 cb(s, SSL_CB_ACCEPT_EXIT, ret);
775
776 return (ret);
777 }
778
779 int
780 ssl3_send_hello_request(SSL *s)
781 {
782 CBB cbb, hello;
783
784 memset(&cbb, 0, sizeof(cbb));
785
786 if (S3I(s)->hs.state == SSL3_ST_SW_HELLO_REQ_A) {
787 if (!ssl3_handshake_msg_start(s, &cbb, &hello,
788 SSL3_MT_HELLO_REQUEST))
789 goto err;
790 if (!ssl3_handshake_msg_finish(s, &cbb))
791 goto err;
792
793 S3I(s)->hs.state = SSL3_ST_SW_HELLO_REQ_B;
794 }
795
796 /* SSL3_ST_SW_HELLO_REQ_B */
797 return (ssl3_handshake_write(s));
798
799 err:
800 CBB_cleanup(&cbb);
801
802 return (-1);
803 }
804
805 int
806 ssl3_get_client_hello(SSL *s)
807 {
808 CBS cbs, client_random, session_id, cookie, cipher_suites;
809 CBS compression_methods;
810 uint16_t client_version;
811 uint8_t comp_method;
812 int comp_null;
813 int i, j, ok, al, ret = -1, cookie_valid = 0;
814 long n;
815 unsigned long id;
816 SSL_CIPHER *c;
817 STACK_OF(SSL_CIPHER) *ciphers = NULL;
818 unsigned long alg_k;
819 const SSL_METHOD *method;
820 uint16_t shared_version;
821
822 /*
823 * We do this so that we will respond with our native type.
824 * If we are TLSv1 and we get SSLv3, we will respond with TLSv1,
825 * This down switching should be handled by a different method.
826 * If we are SSLv3, we will respond with SSLv3, even if prompted with
827 * TLSv1.
828 */
829 if (S3I(s)->hs.state == SSL3_ST_SR_CLNT_HELLO_A) {
830 S3I(s)->hs.state = SSL3_ST_SR_CLNT_HELLO_B;
831 }
832
833 s->internal->first_packet = 1;
834 n = s->method->internal->ssl_get_message(s, SSL3_ST_SR_CLNT_HELLO_B,
835 SSL3_ST_SR_CLNT_HELLO_C, SSL3_MT_CLIENT_HELLO,
836 SSL3_RT_MAX_PLAIN_LENGTH, &ok);
837 if (!ok)
838 return ((int)n);
839 s->internal->first_packet = 0;
840
841 if (n < 0)
842 goto err;
843
844 CBS_init(&cbs, s->internal->init_msg, n);
845
846 /* Parse client hello up until the extensions (if any). */
847 if (!CBS_get_u16(&cbs, &client_version))
848 goto truncated;
849 if (!CBS_get_bytes(&cbs, &client_random, SSL3_RANDOM_SIZE))
850 goto truncated;
851 if (!CBS_get_u8_length_prefixed(&cbs, &session_id))
852 goto truncated;
853 if (SSL_IS_DTLS(s)) {
854 if (!CBS_get_u8_length_prefixed(&cbs, &cookie))
855 goto truncated;
856 }
857 if (!CBS_get_u16_length_prefixed(&cbs, &cipher_suites))
858 goto truncated;
859 if (!CBS_get_u8_length_prefixed(&cbs, &compression_methods))
860 goto truncated;
861
862 /*
863 * Use version from inside client hello, not from record header.
864 * (may differ: see RFC 2246, Appendix E, second paragraph)
865 */
866 if (ssl_max_shared_version(s, client_version, &shared_version) != 1) {
867 SSLerror(s, SSL_R_WRONG_VERSION_NUMBER);
868 if ((s->client_version >> 8) == SSL3_VERSION_MAJOR &&
869 !s->internal->enc_write_ctx && !s->internal->write_hash) {
870 /*
871 * Similar to ssl3_get_record, send alert using remote
872 * version number.
873 */
874 s->version = s->client_version;
875 }
876 al = SSL_AD_PROTOCOL_VERSION;
877 goto f_err;
878 }
879 s->client_version = client_version;
880 s->version = shared_version;
881
882 if ((method = tls1_get_server_method(shared_version)) == NULL)
883 method = dtls1_get_server_method(shared_version);
884 if (method == NULL) {
885 SSLerror(s, ERR_R_INTERNAL_ERROR);
886 goto err;
887 }
888 s->method = method;
889
890 /*
891 * If we require cookies (DTLS) and this ClientHello does not contain
892 * one, just return since we do not want to allocate any memory yet.
893 * So check cookie length...
894 */
895 if (SSL_IS_DTLS(s)) {
896 if (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) {
897 if (CBS_len(&cookie) == 0)
898 return (1);
899 }
900 }
901
902 if (!CBS_write_bytes(&client_random, s->s3->client_random,
903 sizeof(s->s3->client_random), NULL))
904 goto err;
905
906 s->internal->hit = 0;
907
908 /*
909 * Versions before 0.9.7 always allow clients to resume sessions in
910 * renegotiation. 0.9.7 and later allow this by default, but optionally
911 * ignore resumption requests with flag
912 * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION (it's a new flag
913 * rather than a change to default behavior so that applications
914 * relying on this for security won't even compile against older
915 * library versions).
916 *
917 * 1.0.1 and later also have a function SSL_renegotiate_abbreviated()
918 * to request renegotiation but not a new session (s->internal->new_session
919 * remains unset): for servers, this essentially just means that the
920 * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION setting will be
921 * ignored.
922 */
923 if ((s->internal->new_session && (s->internal->options &
924 SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION))) {
925 if (!ssl_get_new_session(s, 1))
926 goto err;
927 } else {
928 CBS ext_block;
929
930 CBS_dup(&cbs, &ext_block);
931
932 i = ssl_get_prev_session(s, CBS_data(&session_id),
933 CBS_len(&session_id), &ext_block);
934 if (i == 1) { /* previous session */
935 s->internal->hit = 1;
936 } else if (i == -1)
937 goto err;
938 else {
939 /* i == 0 */
940 if (!ssl_get_new_session(s, 1))
941 goto err;
942 }
943 }
944
945 if (SSL_IS_DTLS(s)) {
946 /*
947 * The ClientHello may contain a cookie even if the HelloVerify
948 * message has not been sent - make sure that it does not cause
949 * an overflow.
950 */
951 if (CBS_len(&cookie) > sizeof(D1I(s)->rcvd_cookie)) {
952 al = SSL_AD_DECODE_ERROR;
953 SSLerror(s, SSL_R_COOKIE_MISMATCH);
954 goto f_err;
955 }
956
957 /* Verify the cookie if appropriate option is set. */
958 if ((SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) &&
959 CBS_len(&cookie) > 0) {
960 size_t cookie_len;
961
962 /* XXX - rcvd_cookie seems to only be used here... */
963 if (!CBS_write_bytes(&cookie, D1I(s)->rcvd_cookie,
964 sizeof(D1I(s)->rcvd_cookie), &cookie_len))
965 goto err;
966
967 if (s->ctx->internal->app_verify_cookie_cb != NULL) {
968 if (s->ctx->internal->app_verify_cookie_cb(s,
969 D1I(s)->rcvd_cookie, cookie_len) == 0) {
970 al = SSL_AD_HANDSHAKE_FAILURE;
971 SSLerror(s, SSL_R_COOKIE_MISMATCH);
972 goto f_err;
973 }
974 /* else cookie verification succeeded */
975 /* XXX - can d1->cookie_len > sizeof(rcvd_cookie) ? */
976 } else if (timingsafe_memcmp(D1I(s)->rcvd_cookie,
977 D1I(s)->cookie, D1I(s)->cookie_len) != 0) {
978 /* default verification */
979 al = SSL_AD_HANDSHAKE_FAILURE;
980 SSLerror(s, SSL_R_COOKIE_MISMATCH);
981 goto f_err;
982 }
983 cookie_valid = 1;
984 }
985 }
986
987 /* XXX - This logic seems wrong... */
988 if (CBS_len(&cipher_suites) == 0 && CBS_len(&session_id) != 0) {
989 /* we need a cipher if we are not resuming a session */
990 al = SSL_AD_ILLEGAL_PARAMETER;
991 SSLerror(s, SSL_R_NO_CIPHERS_SPECIFIED);
992 goto f_err;
993 }
994
995 if (CBS_len(&cipher_suites) > 0) {
996 if ((ciphers = ssl_bytes_to_cipher_list(s,
997 &cipher_suites)) == NULL)
998 goto err;
999 }
1000
1001 /* If it is a hit, check that the cipher is in the list */
1002 /* XXX - CBS_len(&cipher_suites) will always be zero here... */
1003 if (s->internal->hit && CBS_len(&cipher_suites) > 0) {
1004 j = 0;
1005 id = s->session->cipher->id;
1006
1007 for (i = 0; i < sk_SSL_CIPHER_num(ciphers); i++) {
1008 c = sk_SSL_CIPHER_value(ciphers, i);
1009 if (c->id == id) {
1010 j = 1;
1011 break;
1012 }
1013 }
1014 if (j == 0) {
1015 /*
1016 * We need to have the cipher in the cipher
1017 * list if we are asked to reuse it
1018 */
1019 al = SSL_AD_ILLEGAL_PARAMETER;
1020 SSLerror(s, SSL_R_REQUIRED_CIPHER_MISSING);
1021 goto f_err;
1022 }
1023 }
1024
1025 comp_null = 0;
1026 while (CBS_len(&compression_methods) > 0) {
1027 if (!CBS_get_u8(&compression_methods, &comp_method))
1028 goto truncated;
1029 if (comp_method == 0)
1030 comp_null = 1;
1031 }
1032 if (comp_null == 0) {
1033 al = SSL_AD_DECODE_ERROR;
1034 SSLerror(s, SSL_R_NO_COMPRESSION_SPECIFIED);
1035 goto f_err;
1036 }
1037
1038 if (!tlsext_clienthello_parse(s, &cbs, &al)) {
1039 SSLerror(s, SSL_R_PARSE_TLSEXT);
1040 goto f_err;
1041 }
1042
1043 if (!S3I(s)->renegotiate_seen && s->internal->renegotiate) {
1044 al = SSL_AD_HANDSHAKE_FAILURE;
1045 SSLerror(s, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
1046 goto f_err;
1047 }
1048
1049 if (ssl_check_clienthello_tlsext_early(s) <= 0) {
1050 SSLerror(s, SSL_R_CLIENTHELLO_TLSEXT);
1051 goto err;
1052 }
1053
1054 /*
1055 * Check if we want to use external pre-shared secret for this
1056 * handshake for not reused session only. We need to generate
1057 * server_random before calling tls_session_secret_cb in order to allow
1058 * SessionTicket processing to use it in key derivation.
1059 */
1060 arc4random_buf(s->s3->server_random, SSL3_RANDOM_SIZE);
1061
1062 if (!s->internal->hit && s->internal->tls_session_secret_cb) {
1063 SSL_CIPHER *pref_cipher = NULL;
1064
1065 s->session->master_key_length = sizeof(s->session->master_key);
1066 if (s->internal->tls_session_secret_cb(s, s->session->master_key,
1067 &s->session->master_key_length, ciphers, &pref_cipher,
1068 s->internal->tls_session_secret_cb_arg)) {
1069 s->internal->hit = 1;
1070 s->session->ciphers = ciphers;
1071 s->session->verify_result = X509_V_OK;
1072
1073 ciphers = NULL;
1074
1075 /* check if some cipher was preferred by call back */
1076 pref_cipher = pref_cipher ? pref_cipher :
1077 ssl3_choose_cipher(s, s->session->ciphers,
1078 SSL_get_ciphers(s));
1079 if (pref_cipher == NULL) {
1080 al = SSL_AD_HANDSHAKE_FAILURE;
1081 SSLerror(s, SSL_R_NO_SHARED_CIPHER);
1082 goto f_err;
1083 }
1084
1085 s->session->cipher = pref_cipher;
1086
1087 sk_SSL_CIPHER_free(s->cipher_list);
1088 sk_SSL_CIPHER_free(s->internal->cipher_list_by_id);
1089
1090 s->cipher_list = sk_SSL_CIPHER_dup(s->session->ciphers);
1091 s->internal->cipher_list_by_id =
1092 sk_SSL_CIPHER_dup(s->session->ciphers);
1093 }
1094 }
1095
1096 /*
1097 * Given s->session->ciphers and SSL_get_ciphers, we must
1098 * pick a cipher
1099 */
1100
1101 if (!s->internal->hit) {
1102 sk_SSL_CIPHER_free(s->session->ciphers);
1103 s->session->ciphers = ciphers;
1104 if (ciphers == NULL) {
1105 al = SSL_AD_ILLEGAL_PARAMETER;
1106 SSLerror(s, SSL_R_NO_CIPHERS_PASSED);
1107 goto f_err;
1108 }
1109 ciphers = NULL;
1110 c = ssl3_choose_cipher(s, s->session->ciphers,
1111 SSL_get_ciphers(s));
1112
1113 if (c == NULL) {
1114 al = SSL_AD_HANDSHAKE_FAILURE;
1115 SSLerror(s, SSL_R_NO_SHARED_CIPHER);
1116 goto f_err;
1117 }
1118 S3I(s)->hs.new_cipher = c;
1119 } else {
1120 S3I(s)->hs.new_cipher = s->session->cipher;
1121 }
1122
1123 if (!tls1_handshake_hash_init(s))
1124 goto err;
1125
1126 alg_k = S3I(s)->hs.new_cipher->algorithm_mkey;
1127 if (!(SSL_USE_SIGALGS(s) || (alg_k & SSL_kGOST)) ||
1128 !(s->verify_mode & SSL_VERIFY_PEER)) {
1129 if (!tls1_digest_cached_records(s)) {
1130 al = SSL_AD_INTERNAL_ERROR;
1131 goto f_err;
1132 }
1133 }
1134
1135 /*
1136 * We now have the following setup.
1137 * client_random
1138 * cipher_list - our prefered list of ciphers
1139 * ciphers - the clients prefered list of ciphers
1140 * compression - basically ignored right now
1141 * ssl version is set - sslv3
1142 * s->session - The ssl session has been setup.
1143 * s->internal->hit - session reuse flag
1144 * s->hs.new_cipher - the new cipher to use.
1145 */
1146
1147 /* Handles TLS extensions that we couldn't check earlier */
1148 if (ssl_check_clienthello_tlsext_late(s) <= 0) {
1149 SSLerror(s, SSL_R_CLIENTHELLO_TLSEXT);
1150 goto err;
1151 }
1152
1153 ret = cookie_valid ? 2 : 1;
1154
1155 if (0) {
1156 truncated:
1157 al = SSL_AD_DECODE_ERROR;
1158 SSLerror(s, SSL_R_BAD_PACKET_LENGTH);
1159 f_err:
1160 ssl3_send_alert(s, SSL3_AL_FATAL, al);
1161 }
1162 err:
1163 sk_SSL_CIPHER_free(ciphers);
1164
1165 return (ret);
1166 }
1167
1168 int
1169 ssl3_send_server_hello(SSL *s)
1170 {
1171 CBB cbb, server_hello, session_id;
1172 size_t sl;
1173
1174 memset(&cbb, 0, sizeof(cbb));
1175
1176 if (S3I(s)->hs.state == SSL3_ST_SW_SRVR_HELLO_A) {
1177 if (!ssl3_handshake_msg_start(s, &cbb, &server_hello,
1178 SSL3_MT_SERVER_HELLO))
1179 goto err;
1180
1181 if (!CBB_add_u16(&server_hello, s->version))
1182 goto err;
1183 if (!CBB_add_bytes(&server_hello, s->s3->server_random,
1184 sizeof(s->s3->server_random)))
1185 goto err;
1186
1187 /*
1188 * There are several cases for the session ID to send
1189 * back in the server hello:
1190 *
1191 * - For session reuse from the session cache,
1192 * we send back the old session ID.
1193 * - If stateless session reuse (using a session ticket)
1194 * is successful, we send back the client's "session ID"
1195 * (which doesn't actually identify the session).
1196 * - If it is a new session, we send back the new
1197 * session ID.
1198 * - However, if we want the new session to be single-use,
1199 * we send back a 0-length session ID.
1200 *
1201 * s->internal->hit is non-zero in either case of session reuse,
1202 * so the following won't overwrite an ID that we're supposed
1203 * to send back.
1204 */
1205 if (!(s->ctx->internal->session_cache_mode & SSL_SESS_CACHE_SERVER)
1206 && !s->internal->hit)
1207 s->session->session_id_length = 0;
1208
1209 sl = s->session->session_id_length;
1210 if (sl > sizeof(s->session->session_id)) {
1211 SSLerror(s, ERR_R_INTERNAL_ERROR);
1212 goto err;
1213 }
1214 if (!CBB_add_u8_length_prefixed(&server_hello, &session_id))
1215 goto err;
1216 if (!CBB_add_bytes(&session_id, s->session->session_id, sl))
1217 goto err;
1218
1219 /* Cipher suite. */
1220 if (!CBB_add_u16(&server_hello,
1221 ssl3_cipher_get_value(S3I(s)->hs.new_cipher)))
1222 goto err;
1223
1224 /* Compression method (null). */
1225 if (!CBB_add_u8(&server_hello, 0))
1226 goto err;
1227
1228 /* TLS extensions */
1229 if (!tlsext_serverhello_build(s, &server_hello)) {
1230 SSLerror(s, ERR_R_INTERNAL_ERROR);
1231 goto err;
1232 }
1233
1234 if (!ssl3_handshake_msg_finish(s, &cbb))
1235 goto err;
1236 }
1237
1238 /* SSL3_ST_SW_SRVR_HELLO_B */
1239 return (ssl3_handshake_write(s));
1240
1241 err:
1242 CBB_cleanup(&cbb);
1243
1244 return (-1);
1245 }
1246
1247 int
1248 ssl3_send_server_done(SSL *s)
1249 {
1250 CBB cbb, done;
1251
1252 memset(&cbb, 0, sizeof(cbb));
1253
1254 if (S3I(s)->hs.state == SSL3_ST_SW_SRVR_DONE_A) {
1255 if (!ssl3_handshake_msg_start(s, &cbb, &done,
1256 SSL3_MT_SERVER_DONE))
1257 goto err;
1258 if (!ssl3_handshake_msg_finish(s, &cbb))
1259 goto err;
1260
1261 S3I(s)->hs.state = SSL3_ST_SW_SRVR_DONE_B;
1262 }
1263
1264 /* SSL3_ST_SW_SRVR_DONE_B */
1265 return (ssl3_handshake_write(s));
1266
1267 err:
1268 CBB_cleanup(&cbb);
1269
1270 return (-1);
1271 }
1272
1273 static int
1274 ssl3_send_server_kex_dhe(SSL *s, CBB *cbb)
1275 {
1276 CBB dh_p, dh_g, dh_Ys;
1277 DH *dh = NULL, *dhp;
1278 unsigned char *data;
1279 int al;
1280
1281 if (s->cert->dh_tmp_auto != 0) {
1282 if ((dhp = ssl_get_auto_dh(s)) == NULL) {
1283 al = SSL_AD_INTERNAL_ERROR;
1284 SSLerror(s, ERR_R_INTERNAL_ERROR);
1285 goto f_err;
1286 }
1287 } else
1288 dhp = s->cert->dh_tmp;
1289
1290 if (dhp == NULL && s->cert->dh_tmp_cb != NULL)
1291 dhp = s->cert->dh_tmp_cb(s, 0,
1292 SSL_C_PKEYLENGTH(S3I(s)->hs.new_cipher));
1293
1294 if (dhp == NULL) {
1295 al = SSL_AD_HANDSHAKE_FAILURE;
1296 SSLerror(s, SSL_R_MISSING_TMP_DH_KEY);
1297 goto f_err;
1298 }
1299
1300 if (S3I(s)->tmp.dh != NULL) {
1301 SSLerror(s, ERR_R_INTERNAL_ERROR);
1302 goto err;
1303 }
1304
1305 if (s->cert->dh_tmp_auto != 0) {
1306 dh = dhp;
1307 } else if ((dh = DHparams_dup(dhp)) == NULL) {
1308 SSLerror(s, ERR_R_DH_LIB);
1309 goto err;
1310 }
1311 S3I(s)->tmp.dh = dh;
1312 if (!DH_generate_key(dh)) {
1313 SSLerror(s, ERR_R_DH_LIB);
1314 goto err;
1315 }
1316
1317 /*
1318 * Serialize the DH parameters and public key.
1319 */
1320 if (!CBB_add_u16_length_prefixed(cbb, &dh_p))
1321 goto err;
1322 if (!CBB_add_space(&dh_p, &data, BN_num_bytes(dh->p)))
1323 goto err;
1324 BN_bn2bin(dh->p, data);
1325
1326 if (!CBB_add_u16_length_prefixed(cbb, &dh_g))
1327 goto err;
1328 if (!CBB_add_space(&dh_g, &data, BN_num_bytes(dh->g)))
1329 goto err;
1330 BN_bn2bin(dh->g, data);
1331
1332 if (!CBB_add_u16_length_prefixed(cbb, &dh_Ys))
1333 goto err;
1334 if (!CBB_add_space(&dh_Ys, &data, BN_num_bytes(dh->pub_key)))
1335 goto err;
1336 BN_bn2bin(dh->pub_key, data);
1337
1338 if (!CBB_flush(cbb))
1339 goto err;
1340
1341 return (1);
1342
1343 f_err:
1344 ssl3_send_alert(s, SSL3_AL_FATAL, al);
1345 err:
1346 return (-1);
1347 }
1348
1349 static int
1350 ssl3_send_server_kex_ecdhe_ecp(SSL *s, int nid, CBB *cbb)
1351 {
1352 const EC_GROUP *group;
1353 const EC_POINT *pubkey;
1354 unsigned char *data;
1355 int encoded_len = 0;
1356 int curve_id = 0;
1357 BN_CTX *bn_ctx = NULL;
1358 EC_KEY *ecdh;
1359 CBB ecpoint;
1360 int al;
1361
1362 /*
1363 * Only named curves are supported in ECDH ephemeral key exchanges.
1364 * For supported named curves, curve_id is non-zero.
1365 */
1366 if ((curve_id = tls1_ec_nid2curve_id(nid)) == 0) {
1367 SSLerror(s, SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1368 goto err;
1369 }
1370
1371 if (S3I(s)->tmp.ecdh != NULL) {
1372 SSLerror(s, ERR_R_INTERNAL_ERROR);
1373 goto err;
1374 }
1375
1376 if ((S3I(s)->tmp.ecdh = EC_KEY_new_by_curve_name(nid)) == NULL) {
1377 al = SSL_AD_HANDSHAKE_FAILURE;
1378 SSLerror(s, SSL_R_MISSING_TMP_ECDH_KEY);
1379 goto f_err;
1380 }
1381 ecdh = S3I(s)->tmp.ecdh;
1382
1383 if (!EC_KEY_generate_key(ecdh)) {
1384 SSLerror(s, ERR_R_ECDH_LIB);
1385 goto err;
1386 }
1387 if ((group = EC_KEY_get0_group(ecdh)) == NULL ||
1388 (pubkey = EC_KEY_get0_public_key(ecdh)) == NULL ||
1389 EC_KEY_get0_private_key(ecdh) == NULL) {
1390 SSLerror(s, ERR_R_ECDH_LIB);
1391 goto err;
1392 }
1393
1394 /*
1395 * Encode the public key.
1396 */
1397 encoded_len = EC_POINT_point2oct(group, pubkey,
1398 POINT_CONVERSION_UNCOMPRESSED, NULL, 0, NULL);
1399 if (encoded_len == 0) {
1400 SSLerror(s, ERR_R_ECDH_LIB);
1401 goto err;
1402 }
1403 if ((bn_ctx = BN_CTX_new()) == NULL) {
1404 SSLerror(s, ERR_R_MALLOC_FAILURE);
1405 goto err;
1406 }
1407
1408 /*
1409 * Only named curves are supported in ECDH ephemeral key exchanges.
1410 * In this case the ServerKeyExchange message has:
1411 * [1 byte CurveType], [2 byte CurveName]
1412 * [1 byte length of encoded point], followed by
1413 * the actual encoded point itself.
1414 */
1415 if (!CBB_add_u8(cbb, NAMED_CURVE_TYPE))
1416 goto err;
1417 if (!CBB_add_u16(cbb, curve_id))
1418 goto err;
1419 if (!CBB_add_u8_length_prefixed(cbb, &ecpoint))
1420 goto err;
1421 if (!CBB_add_space(&ecpoint, &data, encoded_len))
1422 goto err;
1423 if (EC_POINT_point2oct(group, pubkey, POINT_CONVERSION_UNCOMPRESSED,
1424 data, encoded_len, bn_ctx) == 0) {
1425 SSLerror(s, ERR_R_ECDH_LIB);
1426 goto err;
1427 }
1428 if (!CBB_flush(cbb))
1429 goto err;
1430
1431 BN_CTX_free(bn_ctx);
1432
1433 return (1);
1434
1435 f_err:
1436 ssl3_send_alert(s, SSL3_AL_FATAL, al);
1437 err:
1438 BN_CTX_free(bn_ctx);
1439
1440 return (-1);
1441 }
1442
1443 static int
1444 ssl3_send_server_kex_ecdhe_ecx(SSL *s, int nid, CBB *cbb)
1445 {
1446 uint8_t *public_key = NULL;
1447 int curve_id;
1448 CBB ecpoint;
1449 int ret = -1;
1450
1451 /* Generate an X25519 key pair. */
1452 if (S3I(s)->tmp.x25519 != NULL) {
1453 SSLerror(s, ERR_R_INTERNAL_ERROR);
1454 goto err;
1455 }
1456 if ((S3I(s)->tmp.x25519 = malloc(X25519_KEY_LENGTH)) == NULL)
1457 goto err;
1458 if ((public_key = malloc(X25519_KEY_LENGTH)) == NULL)
1459 goto err;
1460 X25519_keypair(public_key, S3I(s)->tmp.x25519);
1461
1462 /* Serialize public key. */
1463 if ((curve_id = tls1_ec_nid2curve_id(nid)) == 0) {
1464 SSLerror(s, SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1465 goto err;
1466 }
1467
1468 if (!CBB_add_u8(cbb, NAMED_CURVE_TYPE))
1469 goto err;
1470 if (!CBB_add_u16(cbb, curve_id))
1471 goto err;
1472 if (!CBB_add_u8_length_prefixed(cbb, &ecpoint))
1473 goto err;
1474 if (!CBB_add_bytes(&ecpoint, public_key, X25519_KEY_LENGTH))
1475 goto err;
1476 if (!CBB_flush(cbb))
1477 goto err;
1478
1479 ret = 1;
1480
1481 err:
1482 free(public_key);
1483
1484 return (ret);
1485 }
1486
1487 static int
1488 ssl3_send_server_kex_ecdhe(SSL *s, CBB *cbb)
1489 {
1490 int nid;
1491
1492 nid = tls1_get_shared_curve(s);
1493
1494 if (nid == NID_X25519)
1495 return ssl3_send_server_kex_ecdhe_ecx(s, nid, cbb);
1496
1497 return ssl3_send_server_kex_ecdhe_ecp(s, nid, cbb);
1498 }
1499
1500 int
1501 ssl3_send_server_key_exchange(SSL *s)
1502 {
1503 CBB cbb, cbb_params, cbb_signature, server_kex;
1504 unsigned char *signature = NULL;
1505 unsigned int signature_len;
1506 unsigned char *params = NULL;
1507 size_t params_len;
1508 const EVP_MD *md = NULL;
1509 unsigned long type;
1510 EVP_MD_CTX md_ctx;
1511 EVP_PKEY *pkey;
1512 int al;
1513
1514 memset(&cbb, 0, sizeof(cbb));
1515 memset(&cbb_params, 0, sizeof(cbb_params));
1516
1517 EVP_MD_CTX_init(&md_ctx);
1518
1519 if (S3I(s)->hs.state == SSL3_ST_SW_KEY_EXCH_A) {
1520
1521 if (!ssl3_handshake_msg_start(s, &cbb, &server_kex,
1522 SSL3_MT_SERVER_KEY_EXCHANGE))
1523 goto err;
1524
1525 if (!CBB_init(&cbb_params, 0))
1526 goto err;
1527
1528 type = S3I(s)->hs.new_cipher->algorithm_mkey;
1529 if (type & SSL_kDHE) {
1530 if (ssl3_send_server_kex_dhe(s, &cbb_params) != 1)
1531 goto err;
1532 } else if (type & SSL_kECDHE) {
1533 if (ssl3_send_server_kex_ecdhe(s, &cbb_params) != 1)
1534 goto err;
1535 } else {
1536 al = SSL_AD_HANDSHAKE_FAILURE;
1537 SSLerror(s, SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1538 goto f_err;
1539 }
1540
1541 if (!CBB_finish(&cbb_params, &params, &params_len))
1542 goto err;
1543
1544 if (!CBB_add_bytes(&server_kex, params, params_len))
1545 goto err;
1546
1547 /* Add signature unless anonymous. */
1548 if (!(S3I(s)->hs.new_cipher->algorithm_auth & SSL_aNULL)) {
1549 if ((pkey = ssl_get_sign_pkey(s, S3I(s)->hs.new_cipher,
1550 &md)) == NULL) {
1551 al = SSL_AD_DECODE_ERROR;
1552 goto f_err;
1553 }
1554
1555 if (pkey->type == EVP_PKEY_RSA && !SSL_USE_SIGALGS(s))
1556 md = EVP_md5_sha1();
1557
1558 if (md == NULL) {
1559 /* Is this error check actually needed? */
1560 al = SSL_AD_HANDSHAKE_FAILURE;
1561 SSLerror(s, SSL_R_UNKNOWN_PKEY_TYPE);
1562 goto f_err;
1563 }
1564
1565 /* Send signature algorithm. */
1566 if (SSL_USE_SIGALGS(s)) {
1567 if (!tls12_get_hashandsig(&server_kex, pkey, md)) {
1568 /* Should never happen */
1569 al = SSL_AD_INTERNAL_ERROR;
1570 SSLerror(s, ERR_R_INTERNAL_ERROR);
1571 goto f_err;
1572 }
1573 }
1574
1575 if ((signature = calloc(1, EVP_PKEY_size(pkey))) == NULL)
1576 goto err;
1577
1578 if (!EVP_SignInit_ex(&md_ctx, md, NULL))
1579 goto err;
1580 if (!EVP_SignUpdate(&md_ctx, s->s3->client_random,
1581 SSL3_RANDOM_SIZE))
1582 goto err;
1583 if (!EVP_SignUpdate(&md_ctx, s->s3->server_random,
1584 SSL3_RANDOM_SIZE))
1585 goto err;
1586 if (!EVP_SignUpdate(&md_ctx, params, params_len))
1587 goto err;
1588 if (!EVP_SignFinal(&md_ctx, signature, &signature_len,
1589 pkey)) {
1590 SSLerror(s, ERR_R_EVP_LIB);
1591 goto err;
1592 }
1593
1594 if (!CBB_add_u16_length_prefixed(&server_kex,
1595 &cbb_signature))
1596 goto err;
1597 if (!CBB_add_bytes(&cbb_signature, signature,
1598 signature_len))
1599 goto err;
1600 }
1601
1602 if (!ssl3_handshake_msg_finish(s, &cbb))
1603 goto err;
1604
1605 S3I(s)->hs.state = SSL3_ST_SW_KEY_EXCH_B;
1606 }
1607
1608 EVP_MD_CTX_cleanup(&md_ctx);
1609 free(params);
1610 free(signature);
1611
1612 return (ssl3_handshake_write(s));
1613
1614 f_err:
1615 ssl3_send_alert(s, SSL3_AL_FATAL, al);
1616 err:
1617 CBB_cleanup(&cbb_params);
1618 CBB_cleanup(&cbb);
1619 EVP_MD_CTX_cleanup(&md_ctx);
1620 free(params);
1621 free(signature);
1622
1623 return (-1);
1624 }
1625
1626 int
1627 ssl3_send_certificate_request(SSL *s)
1628 {
1629 CBB cbb, cert_request, cert_types, sigalgs, cert_auth, dn;
1630 STACK_OF(X509_NAME) *sk = NULL;
1631 X509_NAME *name;
1632 int i;
1633
1634 /*
1635 * Certificate Request - RFC 5246 section 7.4.4.
1636 */
1637
1638 memset(&cbb, 0, sizeof(cbb));
1639
1640 if (S3I(s)->hs.state == SSL3_ST_SW_CERT_REQ_A) {
1641 if (!ssl3_handshake_msg_start(s, &cbb, &cert_request,
1642 SSL3_MT_CERTIFICATE_REQUEST))
1643 goto err;
1644
1645 if (!CBB_add_u8_length_prefixed(&cert_request, &cert_types))
1646 goto err;
1647 if (!ssl3_get_req_cert_types(s, &cert_types))
1648 goto err;
1649
1650 if (SSL_USE_SIGALGS(s)) {
1651 unsigned char *sigalgs_data;
1652 size_t sigalgs_len;
1653
1654 tls12_get_req_sig_algs(s, &sigalgs_data, &sigalgs_len);
1655
1656 if (!CBB_add_u16_length_prefixed(&cert_request, &sigalgs))
1657 goto err;
1658 if (!CBB_add_bytes(&sigalgs, sigalgs_data, sigalgs_len))
1659 goto err;
1660 }
1661
1662 if (!CBB_add_u16_length_prefixed(&cert_request, &cert_auth))
1663 goto err;
1664
1665 sk = SSL_get_client_CA_list(s);
1666 for (i = 0; i < sk_X509_NAME_num(sk); i++) {
1667 unsigned char *name_data;
1668 size_t name_len;
1669
1670 name = sk_X509_NAME_value(sk, i);
1671 name_len = i2d_X509_NAME(name, NULL);
1672
1673 if (!CBB_add_u16_length_prefixed(&cert_auth, &dn))
1674 goto err;
1675 if (!CBB_add_space(&dn, &name_data, name_len))
1676 goto err;
1677 if (i2d_X509_NAME(name, &name_data) != name_len)
1678 goto err;
1679 }
1680
1681 if (!ssl3_handshake_msg_finish(s, &cbb))
1682 goto err;
1683
1684 S3I(s)->hs.state = SSL3_ST_SW_CERT_REQ_B;
1685 }
1686
1687 /* SSL3_ST_SW_CERT_REQ_B */
1688 return (ssl3_handshake_write(s));
1689
1690 err:
1691 CBB_cleanup(&cbb);
1692
1693 return (-1);
1694 }
1695
1696 static int
1697 ssl3_get_client_kex_rsa(SSL *s, CBS *cbs)
1698 {
1699 unsigned char fakekey[SSL_MAX_MASTER_KEY_LENGTH];
1700 unsigned char *pms = NULL;
1701 unsigned char *p;
1702 size_t pms_len = 0;
1703 EVP_PKEY *pkey = NULL;
1704 RSA *rsa = NULL;
1705 CBS enc_pms;
1706 int decrypt_len;
1707 int al = -1;
1708
1709 arc4random_buf(fakekey, sizeof(fakekey));
1710 fakekey[0] = s->client_version >> 8;
1711 fakekey[1] = s->client_version & 0xff;
1712
1713 pkey = s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
1714 if ((pkey == NULL) || (pkey->type != EVP_PKEY_RSA) ||
1715 (pkey->pkey.rsa == NULL)) {
1716 al = SSL_AD_HANDSHAKE_FAILURE;
1717 SSLerror(s, SSL_R_MISSING_RSA_CERTIFICATE);
1718 goto f_err;
1719 }
1720 rsa = pkey->pkey.rsa;
1721
1722 pms_len = RSA_size(rsa);
1723 if (pms_len < SSL_MAX_MASTER_KEY_LENGTH)
1724 goto err;
1725 if ((pms = malloc(pms_len)) == NULL)
1726 goto err;
1727 p = pms;
1728
1729 if (!CBS_get_u16_length_prefixed(cbs, &enc_pms))
1730 goto truncated;
1731 if (CBS_len(cbs) != 0 || CBS_len(&enc_pms) != RSA_size(rsa)) {
1732 SSLerror(s, SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
1733 goto err;
1734 }
1735
1736 decrypt_len = RSA_private_decrypt(CBS_len(&enc_pms), CBS_data(&enc_pms),
1737 pms, rsa, RSA_PKCS1_PADDING);
1738
1739 ERR_clear_error();
1740
1741 if (decrypt_len != SSL_MAX_MASTER_KEY_LENGTH) {
1742 al = SSL_AD_DECODE_ERROR;
1743 /* SSLerror(s, SSL_R_BAD_RSA_DECRYPT); */
1744 }
1745
1746 if ((al == -1) && !((pms[0] == (s->client_version >> 8)) &&
1747 (pms[1] == (s->client_version & 0xff)))) {
1748 /*
1749 * The premaster secret must contain the same version number
1750 * as the ClientHello to detect version rollback attacks
1751 * (strangely, the protocol does not offer such protection for
1752 * DH ciphersuites).
1753 *
1754 * The Klima-Pokorny-Rosa extension of Bleichenbacher's attack
1755 * (http://eprint.iacr.org/2003/052/) exploits the version
1756 * number check as a "bad version oracle" -- an alert would
1757 * reveal that the plaintext corresponding to some ciphertext
1758 * made up by the adversary is properly formatted except that
1759 * the version number is wrong. To avoid such attacks, we should
1760 * treat this just like any other decryption error.
1761 */
1762 al = SSL_AD_DECODE_ERROR;
1763 /* SSLerror(s, SSL_R_BAD_PROTOCOL_VERSION_NUMBER); */
1764 }
1765
1766 if (al != -1) {
1767 /*
1768 * Some decryption failure -- use random value instead
1769 * as countermeasure against Bleichenbacher's attack
1770 * on PKCS #1 v1.5 RSA padding (see RFC 2246,
1771 * section 7.4.7.1).
1772 */
1773 p = fakekey;
1774 }
1775
1776 s->session->master_key_length =
1777 tls1_generate_master_secret(s,
1778 s->session->master_key, p, SSL_MAX_MASTER_KEY_LENGTH);
1779
1780 freezero(pms, pms_len);
1781
1782 return (1);
1783
1784 truncated:
1785 al = SSL_AD_DECODE_ERROR;
1786 SSLerror(s, SSL_R_BAD_PACKET_LENGTH);
1787 f_err:
1788 ssl3_send_alert(s, SSL3_AL_FATAL, al);
1789 err:
1790 freezero(pms, pms_len);
1791
1792 return (-1);
1793 }
1794
1795 static int
1796 ssl3_get_client_kex_dhe(SSL *s, CBS *cbs)
1797 {
1798 int key_size = 0, key_len, al;
1799 unsigned char *key = NULL;
1800 BIGNUM *bn = NULL;
1801 CBS dh_Yc;
1802 DH *dh;
1803
1804 if (!CBS_get_u16_length_prefixed(cbs, &dh_Yc))
1805 goto truncated;
1806 if (CBS_len(cbs) != 0)
1807 goto truncated;
1808
1809 if (S3I(s)->tmp.dh == NULL) {
1810 al = SSL_AD_HANDSHAKE_FAILURE;
1811 SSLerror(s, SSL_R_MISSING_TMP_DH_KEY);
1812 goto f_err;
1813 }
1814 dh = S3I(s)->tmp.dh;
1815
1816 if ((bn = BN_bin2bn(CBS_data(&dh_Yc), CBS_len(&dh_Yc), NULL)) == NULL) {
1817 SSLerror(s, SSL_R_BN_LIB);
1818 goto err;
1819 }
1820
1821 if ((key_size = DH_size(dh)) <= 0) {
1822 SSLerror(s, ERR_R_DH_LIB);
1823 goto err;
1824 }
1825 if ((key = malloc(key_size)) == NULL) {
1826 SSLerror(s, ERR_R_MALLOC_FAILURE);
1827 goto err;
1828 }
1829 if ((key_len = DH_compute_key(key, bn, dh)) <= 0) {
1830 SSLerror(s, ERR_R_DH_LIB);
1831 goto err;
1832 }
1833
1834 s->session->master_key_length = tls1_generate_master_secret(s,
1835 s->session->master_key, key, key_len);
1836
1837 DH_free(S3I(s)->tmp.dh);
1838 S3I(s)->tmp.dh = NULL;
1839
1840 freezero(key, key_size);
1841 BN_clear_free(bn);
1842
1843 return (1);
1844
1845 truncated:
1846 al = SSL_AD_DECODE_ERROR;
1847 SSLerror(s, SSL_R_BAD_PACKET_LENGTH);
1848 f_err:
1849 ssl3_send_alert(s, SSL3_AL_FATAL, al);
1850 err:
1851 freezero(key, key_size);
1852 BN_clear_free(bn);
1853
1854 return (-1);
1855 }
1856
1857 static int
1858 ssl3_get_client_kex_ecdhe_ecp(SSL *s, CBS *cbs)
1859 {
1860 unsigned char *key = NULL;
1861 int key_size = 0, key_len;
1862 EC_POINT *point = NULL;
1863 BN_CTX *bn_ctx = NULL;
1864 const EC_GROUP *group;
1865 EC_KEY *ecdh;
1866 CBS public;
1867 int ret = -1;
1868
1869 if (!CBS_get_u8_length_prefixed(cbs, &public))
1870 goto err;
1871 if (CBS_len(cbs) != 0)
1872 goto err;
1873
1874 /*
1875 * Use the ephemeral values we saved when generating the
1876 * ServerKeyExchange message.
1877 */
1878 if ((ecdh = S3I(s)->tmp.ecdh) == NULL) {
1879 SSLerror(s, ERR_R_INTERNAL_ERROR);
1880 goto err;
1881 }
1882 group = EC_KEY_get0_group(ecdh);
1883
1884 /*
1885 * Get client's public key from encoded point in the ClientKeyExchange
1886 * message.
1887 */
1888 if ((bn_ctx = BN_CTX_new()) == NULL) {
1889 SSLerror(s, ERR_R_MALLOC_FAILURE);
1890 goto err;
1891 }
1892 if ((point = EC_POINT_new(group)) == NULL) {
1893 SSLerror(s, ERR_R_MALLOC_FAILURE);
1894 goto err;
1895 }
1896 if (EC_POINT_oct2point(group, point, CBS_data(&public),
1897 CBS_len(&public), bn_ctx) == 0) {
1898 SSLerror(s, ERR_R_EC_LIB);
1899 goto err;
1900 }
1901
1902 /* Compute the shared pre-master secret */
1903 if ((key_size = ECDH_size(ecdh)) <= 0) {
1904 SSLerror(s, ERR_R_ECDH_LIB);
1905 goto err;
1906 }
1907 if ((key = malloc(key_size)) == NULL) {
1908 SSLerror(s, ERR_R_MALLOC_FAILURE);
1909 goto err;
1910 }
1911 if ((key_len = ECDH_compute_key(key, key_size, point, ecdh,
1912 NULL)) <= 0) {
1913 SSLerror(s, ERR_R_ECDH_LIB);
1914 goto err;
1915 }
1916
1917 /* Compute the master secret */
1918 s->session->master_key_length = tls1_generate_master_secret(s,
1919 s->session->master_key, key, key_len);
1920
1921 EC_KEY_free(S3I(s)->tmp.ecdh);
1922 S3I(s)->tmp.ecdh = NULL;
1923
1924 ret = 1;
1925
1926 err:
1927 freezero(key, key_size);
1928 EC_POINT_free(point);
1929 BN_CTX_free(bn_ctx);
1930
1931 return (ret);
1932 }
1933
1934 static int
1935 ssl3_get_client_kex_ecdhe_ecx(SSL *s, CBS *cbs)
1936 {
1937 uint8_t *shared_key = NULL;
1938 CBS ecpoint;
1939 int ret = -1;
1940
1941 if (!CBS_get_u8_length_prefixed(cbs, &ecpoint))
1942 goto err;
1943 if (CBS_len(cbs) != 0)
1944 goto err;
1945 if (CBS_len(&ecpoint) != X25519_KEY_LENGTH)
1946 goto err;
1947
1948 if ((shared_key = malloc(X25519_KEY_LENGTH)) == NULL)
1949 goto err;
1950 if (!X25519(shared_key, S3I(s)->tmp.x25519, CBS_data(&ecpoint)))
1951 goto err;
1952
1953 freezero(S3I(s)->tmp.x25519, X25519_KEY_LENGTH);
1954 S3I(s)->tmp.x25519 = NULL;
1955
1956 s->session->master_key_length =
1957 tls1_generate_master_secret(
1958 s, s->session->master_key, shared_key, X25519_KEY_LENGTH);
1959
1960 ret = 1;
1961
1962 err:
1963 freezero(shared_key, X25519_KEY_LENGTH);
1964
1965 return (ret);
1966 }
1967
1968 static int
1969 ssl3_get_client_kex_ecdhe(SSL *s, CBS *cbs)
1970 {
1971 if (S3I(s)->tmp.x25519 != NULL)
1972 return ssl3_get_client_kex_ecdhe_ecx(s, cbs);
1973
1974 return ssl3_get_client_kex_ecdhe_ecp(s, cbs);
1975 }
1976
1977 static int
1978 ssl3_get_client_kex_gost(SSL *s, CBS *cbs)
1979 {
1980 EVP_PKEY_CTX *pkey_ctx;
1981 EVP_PKEY *client_pub_pkey = NULL, *pk = NULL;
1982 unsigned char premaster_secret[32];
1983 unsigned long alg_a;
1984 size_t outlen = 32;
1985 CBS gostblob;
1986 int al;
1987 int ret = 0;
1988
1989 /* Get our certificate private key*/
1990 alg_a = S3I(s)->hs.new_cipher->algorithm_auth;
1991 if (alg_a & SSL_aGOST01)
1992 pk = s->cert->pkeys[SSL_PKEY_GOST01].privatekey;
1993
1994 if ((pkey_ctx = EVP_PKEY_CTX_new(pk, NULL)) == NULL)
1995 goto err;
1996 if (EVP_PKEY_decrypt_init(pkey_ctx) <= 0)
1997 goto gerr;
1998
1999 /*
2000 * If client certificate is present and is of the same type,
2001 * maybe use it for key exchange.
2002 * Don't mind errors from EVP_PKEY_derive_set_peer, because
2003 * it is completely valid to use a client certificate for
2004 * authorization only.
2005 */
2006 if ((client_pub_pkey = X509_get_pubkey(s->session->peer)) != NULL) {
2007 if (EVP_PKEY_derive_set_peer(pkey_ctx,
2008 client_pub_pkey) <= 0)
2009 ERR_clear_error();
2010 }
2011
2012 /* Decrypt session key */
2013 if (!CBS_get_asn1(cbs, &gostblob, CBS_ASN1_SEQUENCE))
2014 goto truncated;
2015 if (CBS_len(cbs) != 0)
2016 goto truncated;
2017 if (EVP_PKEY_decrypt(pkey_ctx, premaster_secret, &outlen,
2018 CBS_data(&gostblob), CBS_len(&gostblob)) <= 0) {
2019 SSLerror(s, SSL_R_DECRYPTION_FAILED);
2020 goto gerr;
2021 }
2022
2023 /* Generate master secret */
2024 s->session->master_key_length =
2025 tls1_generate_master_secret(
2026 s, s->session->master_key, premaster_secret, 32);
2027
2028 /* Check if pubkey from client certificate was used */
2029 if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1,
2030 EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0)
2031 ret = 2;
2032 else
2033 ret = 1;
2034 gerr:
2035 EVP_PKEY_free(client_pub_pkey);
2036 EVP_PKEY_CTX_free(pkey_ctx);
2037 if (ret)
2038 return (ret);
2039 else
2040 goto err;
2041
2042 truncated:
2043 al = SSL_AD_DECODE_ERROR;
2044 SSLerror(s, SSL_R_BAD_PACKET_LENGTH);
2045 ssl3_send_alert(s, SSL3_AL_FATAL, al);
2046 err:
2047 return (-1);
2048 }
2049
2050 int
2051 ssl3_get_client_key_exchange(SSL *s)
2052 {
2053 unsigned long alg_k;
2054 int al, ok;
2055 CBS cbs;
2056 long n;
2057
2058 /* 2048 maxlen is a guess. How long a key does that permit? */
2059 n = s->method->internal->ssl_get_message(s, SSL3_ST_SR_KEY_EXCH_A,
2060 SSL3_ST_SR_KEY_EXCH_B, SSL3_MT_CLIENT_KEY_EXCHANGE, 2048, &ok);
2061 if (!ok)
2062 return ((int)n);
2063
2064 if (n < 0)
2065 goto err;
2066
2067 CBS_init(&cbs, s->internal->init_msg, n);
2068
2069 alg_k = S3I(s)->hs.new_cipher->algorithm_mkey;
2070
2071 if (alg_k & SSL_kRSA) {
2072 if (ssl3_get_client_kex_rsa(s, &cbs) != 1)
2073 goto err;
2074 } else if (alg_k & SSL_kDHE) {
2075 if (ssl3_get_client_kex_dhe(s, &cbs) != 1)
2076 goto err;
2077 } else if (alg_k & SSL_kECDHE) {
2078 if (ssl3_get_client_kex_ecdhe(s, &cbs) != 1)
2079 goto err;
2080 } else if (alg_k & SSL_kGOST) {
2081 if (ssl3_get_client_kex_gost(s, &cbs) != 1)
2082 goto err;
2083 } else {
2084 al = SSL_AD_HANDSHAKE_FAILURE;
2085 SSLerror(s, SSL_R_UNKNOWN_CIPHER_TYPE);
2086 goto f_err;
2087 }
2088
2089 if (CBS_len(&cbs) != 0) {
2090 al = SSL_AD_DECODE_ERROR;
2091 SSLerror(s, SSL_R_BAD_PACKET_LENGTH);
2092 goto f_err;
2093 }
2094
2095 return (1);
2096
2097 f_err:
2098 ssl3_send_alert(s, SSL3_AL_FATAL, al);
2099 err:
2100 return (-1);
2101 }
2102
2103 int
2104 ssl3_get_cert_verify(SSL *s)
2105 {
2106 CBS cbs, signature;
2107 const EVP_MD *md = NULL;
2108 EVP_PKEY *pkey = NULL;
2109 X509 *peer = NULL;
2110 EVP_MD_CTX mctx;
2111 uint8_t hash_id, sig_id;
2112 int al, ok, sigalg, verify;
2113 int type = 0;
2114 int ret = 0;
2115 long hdatalen;
2116 void *hdata;
2117 long n;
2118
2119 EVP_MD_CTX_init(&mctx);
2120
2121 n = s->method->internal->ssl_get_message(s, SSL3_ST_SR_CERT_VRFY_A,
2122 SSL3_ST_SR_CERT_VRFY_B, -1, SSL3_RT_MAX_PLAIN_LENGTH, &ok);
2123 if (!ok)
2124 return ((int)n);
2125
2126 if (n < 0)
2127 goto err;
2128
2129 CBS_init(&cbs, s->internal->init_msg, n);
2130
2131 if (s->session->peer != NULL) {
2132 peer = s->session->peer;
2133 pkey = X509_get_pubkey(peer);
2134 type = X509_certificate_type(peer, pkey);
2135 }
2136
2137 if (S3I(s)->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY) {
2138 S3I(s)->tmp.reuse_message = 1;
2139 if (peer != NULL) {
2140 al = SSL_AD_UNEXPECTED_MESSAGE;
2141 SSLerror(s, SSL_R_MISSING_VERIFY_MESSAGE);
2142 goto f_err;
2143 }
2144 ret = 1;
2145 goto end;
2146 }
2147
2148 if (peer == NULL) {
2149 SSLerror(s, SSL_R_NO_CLIENT_CERT_RECEIVED);
2150 al = SSL_AD_UNEXPECTED_MESSAGE;
2151 goto f_err;
2152 }
2153
2154 if (!(type & EVP_PKT_SIGN)) {
2155 SSLerror(s, SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
2156 al = SSL_AD_ILLEGAL_PARAMETER;
2157 goto f_err;
2158 }
2159
2160 if (S3I(s)->change_cipher_spec) {
2161 SSLerror(s, SSL_R_CCS_RECEIVED_EARLY);
2162 al = SSL_AD_UNEXPECTED_MESSAGE;
2163 goto f_err;
2164 }
2165
2166 /*
2167 * Check for broken implementations of GOST ciphersuites.
2168 *
2169 * If key is GOST and n is exactly 64, it is a bare
2170 * signature without length field.
2171 */
2172 if ((pkey->type == NID_id_GostR3410_94 ||
2173 pkey->type == NID_id_GostR3410_2001) && CBS_len(&cbs) == 64) {
2174 CBS_dup(&cbs, &signature);
2175 if (!CBS_skip(&cbs, CBS_len(&cbs)))
2176 goto err;
2177 } else {
2178 if (SSL_USE_SIGALGS(s)) {
2179 if (!CBS_get_u8(&cbs, &hash_id))
2180 goto truncated;
2181 if (!CBS_get_u8(&cbs, &sig_id))
2182 goto truncated;
2183
2184 if ((md = tls12_get_hash(hash_id)) == NULL) {
2185 SSLerror(s, SSL_R_UNKNOWN_DIGEST);
2186 al = SSL_AD_DECODE_ERROR;
2187 goto f_err;
2188 }
2189
2190 /* Check key type is consistent with signature. */
2191 if ((sigalg = tls12_get_sigid(pkey)) == -1) {
2192 /* Should never happen */
2193 SSLerror(s, ERR_R_INTERNAL_ERROR);
2194 goto err;
2195 }
2196 if (sigalg != sig_id) {
2197 SSLerror(s, SSL_R_WRONG_SIGNATURE_TYPE);
2198 al = SSL_AD_DECODE_ERROR;
2199 goto f_err;
2200 }
2201 }
2202 if (!CBS_get_u16_length_prefixed(&cbs, &signature))
2203 goto err;
2204 }
2205 if (CBS_len(&signature) > EVP_PKEY_size(pkey)) {
2206 SSLerror(s, SSL_R_WRONG_SIGNATURE_SIZE);
2207 al = SSL_AD_DECODE_ERROR;
2208 goto f_err;
2209 }
2210 if (CBS_len(&cbs) != 0) {
2211 al = SSL_AD_DECODE_ERROR;
2212 SSLerror(s, SSL_R_EXTRA_DATA_IN_MESSAGE);
2213 goto f_err;
2214 }
2215
2216 if (SSL_USE_SIGALGS(s)) {
2217 hdatalen = BIO_get_mem_data(S3I(s)->handshake_buffer, &hdata);
2218 if (hdatalen <= 0) {
2219 SSLerror(s, ERR_R_INTERNAL_ERROR);
2220 al = SSL_AD_INTERNAL_ERROR;
2221 goto f_err;
2222 }
2223 if (!EVP_VerifyInit_ex(&mctx, md, NULL) ||
2224 !EVP_VerifyUpdate(&mctx, hdata, hdatalen)) {
2225 SSLerror(s, ERR_R_EVP_LIB);
2226 al = SSL_AD_INTERNAL_ERROR;
2227 goto f_err;
2228 }
2229 if (EVP_VerifyFinal(&mctx, CBS_data(&signature),
2230 CBS_len(&signature), pkey) <= 0) {
2231 al = SSL_AD_DECRYPT_ERROR;
2232 SSLerror(s, SSL_R_BAD_SIGNATURE);
2233 goto f_err;
2234 }
2235 } else if (pkey->type == EVP_PKEY_RSA) {
2236 verify = RSA_verify(NID_md5_sha1, S3I(s)->tmp.cert_verify_md,
2237 MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH, CBS_data(&signature),
2238 CBS_len(&signature), pkey->pkey.rsa);
2239 if (verify < 0) {
2240 al = SSL_AD_DECRYPT_ERROR;
2241 SSLerror(s, SSL_R_BAD_RSA_DECRYPT);
2242 goto f_err;
2243 }
2244 if (verify == 0) {
2245 al = SSL_AD_DECRYPT_ERROR;
2246 SSLerror(s, SSL_R_BAD_RSA_SIGNATURE);
2247 goto f_err;
2248 }
2249 } else if (pkey->type == EVP_PKEY_EC) {
2250 verify = ECDSA_verify(pkey->save_type,
2251 &(S3I(s)->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
2252 SHA_DIGEST_LENGTH, CBS_data(&signature),
2253 CBS_len(&signature), pkey->pkey.ec);
2254 if (verify <= 0) {
2255 al = SSL_AD_DECRYPT_ERROR;
2256 SSLerror(s, SSL_R_BAD_ECDSA_SIGNATURE);
2257 goto f_err;
2258 }
2259 } else
2260 #ifndef OPENSSL_NO_GOST
2261 if (pkey->type == NID_id_GostR3410_94 ||
2262 pkey->type == NID_id_GostR3410_2001) {
2263 unsigned char sigbuf[128];
2264 unsigned int siglen = sizeof(sigbuf);
2265 EVP_PKEY_CTX *pctx;
2266 int nid;
2267
2268 hdatalen = BIO_get_mem_data(S3I(s)->handshake_buffer, &hdata);
2269 if (hdatalen <= 0) {
2270 SSLerror(s, ERR_R_INTERNAL_ERROR);
2271 al = SSL_AD_INTERNAL_ERROR;
2272 goto f_err;
2273 }
2274 if (!EVP_PKEY_get_default_digest_nid(pkey, &nid) ||
2275 !(md = EVP_get_digestbynid(nid))) {
2276 SSLerror(s, ERR_R_EVP_LIB);
2277 al = SSL_AD_INTERNAL_ERROR;
2278 goto f_err;
2279 }
2280 if ((pctx = EVP_PKEY_CTX_new(pkey, NULL)) == NULL) {
2281 SSLerror(s, ERR_R_EVP_LIB);
2282 al = SSL_AD_INTERNAL_ERROR;
2283 goto f_err;
2284 }
2285 if (!EVP_DigestInit_ex(&mctx, md, NULL) ||
2286 !EVP_DigestUpdate(&mctx, hdata, hdatalen) ||
2287 !EVP_DigestFinal(&mctx, sigbuf, &siglen) ||
2288 (EVP_PKEY_verify_init(pctx) <= 0) ||
2289 (EVP_PKEY_CTX_set_signature_md(pctx, md) <= 0) ||
2290 (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_VERIFY,
2291 EVP_PKEY_CTRL_GOST_SIG_FORMAT,
2292 GOST_SIG_FORMAT_RS_LE, NULL) <= 0)) {
2293 SSLerror(s, ERR_R_EVP_LIB);
2294 al = SSL_AD_INTERNAL_ERROR;
2295 EVP_PKEY_CTX_free(pctx);
2296 goto f_err;
2297 }
2298 if (EVP_PKEY_verify(pctx, CBS_data(&signature),
2299 CBS_len(&signature), sigbuf, siglen) <= 0) {
2300 al = SSL_AD_DECRYPT_ERROR;
2301 SSLerror(s, SSL_R_BAD_SIGNATURE);
2302 EVP_PKEY_CTX_free(pctx);
2303 goto f_err;
2304 }
2305
2306 EVP_PKEY_CTX_free(pctx);
2307 } else
2308 #endif
2309 {
2310 SSLerror(s, ERR_R_INTERNAL_ERROR);
2311 al = SSL_AD_UNSUPPORTED_CERTIFICATE;
2312 goto f_err;
2313 }
2314
2315 ret = 1;
2316 if (0) {
2317 truncated:
2318 al = SSL_AD_DECODE_ERROR;
2319 SSLerror(s, SSL_R_BAD_PACKET_LENGTH);
2320 f_err:
2321 ssl3_send_alert(s, SSL3_AL_FATAL, al);
2322 }
2323 end:
2324 if (S3I(s)->handshake_buffer) {
2325 BIO_free(S3I(s)->handshake_buffer);
2326 S3I(s)->handshake_buffer = NULL;
2327 s->s3->flags &= ~TLS1_FLAGS_KEEP_HANDSHAKE;
2328 }
2329 err:
2330 EVP_MD_CTX_cleanup(&mctx);
2331 EVP_PKEY_free(pkey);
2332 return (ret);
2333 }
2334
2335 int
2336 ssl3_get_client_certificate(SSL *s)
2337 {
2338 CBS cbs, client_certs;
2339 int i, ok, al, ret = -1;
2340 X509 *x = NULL;
2341 long n;
2342 const unsigned char *q;
2343 STACK_OF(X509) *sk = NULL;
2344
2345 n = s->method->internal->ssl_get_message(s, SSL3_ST_SR_CERT_A, SSL3_ST_SR_CERT_B,
2346 -1, s->internal->max_cert_list, &ok);
2347
2348 if (!ok)
2349 return ((int)n);
2350
2351 if (S3I(s)->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE) {
2352 if ((s->verify_mode & SSL_VERIFY_PEER) &&
2353 (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) {
2354 SSLerror(s, SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
2355 al = SSL_AD_HANDSHAKE_FAILURE;
2356 goto f_err;
2357 }
2358 /*
2359 * If tls asked for a client cert,
2360 * the client must return a 0 list.
2361 */
2362 if (S3I(s)->tmp.cert_request) {
2363 SSLerror(s, SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST
2364 );
2365 al = SSL_AD_UNEXPECTED_MESSAGE;
2366 goto f_err;
2367 }
2368 S3I(s)->tmp.reuse_message = 1;
2369 return (1);
2370 }
2371
2372 if (S3I(s)->tmp.message_type != SSL3_MT_CERTIFICATE) {
2373 al = SSL_AD_UNEXPECTED_MESSAGE;
2374 SSLerror(s, SSL_R_WRONG_MESSAGE_TYPE);
2375 goto f_err;
2376 }
2377
2378 if (n < 0)
2379 goto truncated;
2380
2381 CBS_init(&cbs, s->internal->init_msg, n);
2382
2383 if ((sk = sk_X509_new_null()) == NULL) {
2384 SSLerror(s, ERR_R_MALLOC_FAILURE);
2385 goto err;
2386 }
2387
2388 if (!CBS_get_u24_length_prefixed(&cbs, &client_certs) ||
2389 CBS_len(&cbs) != 0)
2390 goto truncated;
2391
2392 while (CBS_len(&client_certs) > 0) {
2393 CBS cert;
2394
2395 if (!CBS_get_u24_length_prefixed(&client_certs, &cert)) {
2396 al = SSL_AD_DECODE_ERROR;
2397 SSLerror(s, SSL_R_CERT_LENGTH_MISMATCH);
2398 goto f_err;
2399 }
2400
2401 q = CBS_data(&cert);
2402 x = d2i_X509(NULL, &q, CBS_len(&cert));
2403 if (x == NULL) {
2404 SSLerror(s, ERR_R_ASN1_LIB);
2405 goto err;
2406 }
2407 if (q != CBS_data(&cert) + CBS_len(&cert)) {
2408 al = SSL_AD_DECODE_ERROR;
2409 SSLerror(s, SSL_R_CERT_LENGTH_MISMATCH);
2410 goto f_err;
2411 }
2412 if (!sk_X509_push(sk, x)) {
2413 SSLerror(s, ERR_R_MALLOC_FAILURE);
2414 goto err;
2415 }
2416 x = NULL;
2417 }
2418
2419 if (sk_X509_num(sk) <= 0) {
2420 /*
2421 * TLS does not mind 0 certs returned.
2422 * Fail for TLS only if we required a certificate.
2423 */
2424 if ((s->verify_mode & SSL_VERIFY_PEER) &&
2425 (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) {
2426 SSLerror(s, SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
2427 al = SSL_AD_HANDSHAKE_FAILURE;
2428 goto f_err;
2429 }
2430 /* No client certificate so digest cached records */
2431 if (S3I(s)->handshake_buffer && !tls1_digest_cached_records(s)) {
2432 al = SSL_AD_INTERNAL_ERROR;
2433 goto f_err;
2434 }
2435 } else {
2436 i = ssl_verify_cert_chain(s, sk);
2437 if (i <= 0) {
2438 al = ssl_verify_alarm_type(s->verify_result);
2439 SSLerror(s, SSL_R_NO_CERTIFICATE_RETURNED);
2440 goto f_err;
2441 }
2442 }
2443
2444 X509_free(s->session->peer);
2445 s->session->peer = sk_X509_shift(sk);
2446 s->session->verify_result = s->verify_result;
2447
2448 /*
2449 * With the current implementation, sess_cert will always be NULL
2450 * when we arrive here
2451 */
2452 if (SSI(s)->sess_cert == NULL) {
2453 SSI(s)->sess_cert = ssl_sess_cert_new();
2454 if (SSI(s)->sess_cert == NULL) {
2455 SSLerror(s, ERR_R_MALLOC_FAILURE);
2456 goto err;
2457 }
2458 }
2459 sk_X509_pop_free(SSI(s)->sess_cert->cert_chain, X509_free);
2460 SSI(s)->sess_cert->cert_chain = sk;
2461
2462 /*
2463 * Inconsistency alert: cert_chain does *not* include the
2464 * peer's own certificate, while we do include it in s3_clnt.c
2465 */
2466
2467 sk = NULL;
2468
2469 ret = 1;
2470 if (0) {
2471 truncated:
2472 al = SSL_AD_DECODE_ERROR;
2473 SSLerror(s, SSL_R_BAD_PACKET_LENGTH);
2474 f_err:
2475 ssl3_send_alert(s, SSL3_AL_FATAL, al);
2476 }
2477 err:
2478 X509_free(x);
2479 sk_X509_pop_free(sk, X509_free);
2480
2481 return (ret);
2482 }
2483
2484 int
2485 ssl3_send_server_certificate(SSL *s)
2486 {
2487 CBB cbb, server_cert;
2488 X509 *x;
2489
2490 /*
2491 * Server Certificate - RFC 5246, section 7.4.2.
2492 */
2493
2494 memset(&cbb, 0, sizeof(cbb));
2495
2496 if (S3I(s)->hs.state == SSL3_ST_SW_CERT_A) {
2497 if ((x = ssl_get_server_send_cert(s)) == NULL) {
2498 SSLerror(s, ERR_R_INTERNAL_ERROR);
2499 return (0);
2500 }
2501
2502 if (!ssl3_handshake_msg_start(s, &cbb, &server_cert,
2503 SSL3_MT_CERTIFICATE))
2504 goto err;
2505 if (!ssl3_output_cert_chain(s, &server_cert, x))
2506 goto err;
2507 if (!ssl3_handshake_msg_finish(s, &cbb))
2508 goto err;
2509
2510 S3I(s)->hs.state = SSL3_ST_SW_CERT_B;
2511 }
2512
2513 /* SSL3_ST_SW_CERT_B */
2514 return (ssl3_handshake_write(s));
2515
2516 err:
2517 CBB_cleanup(&cbb);
2518
2519 return (0);
2520 }
2521
2522 /* send a new session ticket (not necessarily for a new session) */
2523 int
2524 ssl3_send_newsession_ticket(SSL *s)
2525 {
2526 CBB cbb, session_ticket, ticket;
2527 SSL_CTX *tctx = s->initial_ctx;
2528 size_t enc_session_len, enc_session_max_len, hmac_len;
2529 size_t session_len = 0;
2530 unsigned char *enc_session = NULL, *session = NULL;
2531 unsigned char iv[EVP_MAX_IV_LENGTH];
2532 unsigned char key_name[16];
2533 unsigned char *hmac;
2534 unsigned int hlen;
2535 EVP_CIPHER_CTX ctx;
2536 HMAC_CTX hctx;
2537 int len;
2538
2539 /*
2540 * New Session Ticket - RFC 5077, section 3.3.
2541 */
2542
2543 EVP_CIPHER_CTX_init(&ctx);
2544 HMAC_CTX_init(&hctx);
2545
2546 memset(&cbb, 0, sizeof(cbb));
2547
2548 if (S3I(s)->hs.state == SSL3_ST_SW_SESSION_TICKET_A) {
2549 if (!ssl3_handshake_msg_start(s, &cbb, &session_ticket,
2550 SSL3_MT_NEWSESSION_TICKET))
2551 goto err;
2552
2553 if (!SSL_SESSION_ticket(s->session, &session, &session_len))
2554 goto err;
2555 if (session_len > 0xffff)
2556 goto err;
2557
2558 /*
2559 * Initialize HMAC and cipher contexts. If callback is present
2560 * it does all the work, otherwise use generated values from
2561 * parent context.
2562 */
2563 if (tctx->internal->tlsext_ticket_key_cb != NULL) {
2564 if (tctx->internal->tlsext_ticket_key_cb(s,
2565 key_name, iv, &ctx, &hctx, 1) < 0) {
2566 EVP_CIPHER_CTX_cleanup(&ctx);
2567 goto err;
2568 }
2569 } else {
2570 arc4random_buf(iv, 16);
2571 EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
2572 tctx->internal->tlsext_tick_aes_key, iv);
2573 HMAC_Init_ex(&hctx, tctx->internal->tlsext_tick_hmac_key,
2574 16, tlsext_tick_md(), NULL);
2575 memcpy(key_name, tctx->internal->tlsext_tick_key_name, 16);
2576 }
2577
2578 /* Encrypt the session state. */
2579 enc_session_max_len = session_len + EVP_MAX_BLOCK_LENGTH;
2580 if ((enc_session = calloc(1, enc_session_max_len)) == NULL)
2581 goto err;
2582 enc_session_len = 0;
2583 if (!EVP_EncryptUpdate(&ctx, enc_session, &len, session,
2584 session_len))
2585 goto err;
2586 enc_session_len += len;
2587 if (!EVP_EncryptFinal_ex(&ctx, enc_session + enc_session_len,
2588 &len))
2589 goto err;
2590 enc_session_len += len;
2591
2592 if (enc_session_len > enc_session_max_len)
2593 goto err;
2594
2595 /* Generate the HMAC. */
2596 if (!HMAC_Update(&hctx, key_name, sizeof(key_name)))
2597 goto err;
2598 if (!HMAC_Update(&hctx, iv, EVP_CIPHER_CTX_iv_length(&ctx)))
2599 goto err;
2600 if (!HMAC_Update(&hctx, enc_session, enc_session_len))
2601 goto err;
2602
2603 if ((hmac_len = HMAC_size(&hctx)) <= 0)
2604 goto err;
2605
2606 /*
2607 * Ticket lifetime hint (advisory only):
2608 * We leave this unspecified for resumed session
2609 * (for simplicity), and guess that tickets for new
2610 * sessions will live as long as their sessions.
2611 */
2612 if (!CBB_add_u32(&session_ticket,
2613 s->internal->hit ? 0 : s->session->timeout))
2614 goto err;
2615
2616 if (!CBB_add_u16_length_prefixed(&session_ticket, &ticket))
2617 goto err;
2618 if (!CBB_add_bytes(&ticket, key_name, sizeof(key_name)))
2619 goto err;
2620 if (!CBB_add_bytes(&ticket, iv, EVP_CIPHER_CTX_iv_length(&ctx)))
2621 goto err;
2622 if (!CBB_add_bytes(&ticket, enc_session, enc_session_len))
2623 goto err;
2624 if (!CBB_add_space(&ticket, &hmac, hmac_len))
2625 goto err;
2626
2627 if (!HMAC_Final(&hctx, hmac, &hlen))
2628 goto err;
2629 if (hlen != hmac_len)
2630 goto err;
2631
2632 if (!ssl3_handshake_msg_finish(s, &cbb))
2633 goto err;
2634
2635 S3I(s)->hs.state = SSL3_ST_SW_SESSION_TICKET_B;
2636 }
2637
2638 EVP_CIPHER_CTX_cleanup(&ctx);
2639 HMAC_CTX_cleanup(&hctx);
2640 freezero(session, session_len);
2641 free(enc_session);
2642
2643 /* SSL3_ST_SW_SESSION_TICKET_B */
2644 return (ssl3_handshake_write(s));
2645
2646 err:
2647 CBB_cleanup(&cbb);
2648 EVP_CIPHER_CTX_cleanup(&ctx);
2649 HMAC_CTX_cleanup(&hctx);
2650 freezero(session, session_len);
2651 free(enc_session);
2652
2653 return (-1);
2654 }
2655
2656 int
2657 ssl3_send_cert_status(SSL *s)
2658 {
2659 CBB cbb, certstatus, ocspresp;
2660
2661 memset(&cbb, 0, sizeof(cbb));
2662
2663 if (S3I(s)->hs.state == SSL3_ST_SW_CERT_STATUS_A) {
2664 if (!ssl3_handshake_msg_start(s, &cbb, &certstatus,
2665 SSL3_MT_CERTIFICATE_STATUS))
2666 goto err;
2667 if (!CBB_add_u8(&certstatus, s->tlsext_status_type))
2668 goto err;
2669 if (!CBB_add_u24_length_prefixed(&certstatus, &ocspresp))
2670 goto err;
2671 if (!CBB_add_bytes(&ocspresp, s->internal->tlsext_ocsp_resp,
2672 s->internal->tlsext_ocsp_resplen))
2673 goto err;
2674 if (!ssl3_handshake_msg_finish(s, &cbb))
2675 goto err;
2676
2677 S3I(s)->hs.state = SSL3_ST_SW_CERT_STATUS_B;
2678 }
2679
2680 /* SSL3_ST_SW_CERT_STATUS_B */
2681 return (ssl3_handshake_write(s));
2682
2683 err:
2684 CBB_cleanup(&cbb);
2685
2686 return (-1);
2687 }
Unleashed OS