1 /* $OpenBSD: ssl_srvr.c,v 1.85 2020/09/24 18:12:00 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_sigalgs.h"
170 #include "ssl_tlsext.h"
171
172 int
ssl3_accept(SSL * s)173 ssl3_accept(SSL *s)
174 {
175 void (*cb)(const SSL *ssl, int type, int val) = NULL;
176 unsigned long alg_k;
177 int ret = -1;
178 int new_state, state, skip = 0;
179 int listen = 0;
180
181 ERR_clear_error();
182 errno = 0;
183
184 if (s->internal->info_callback != NULL)
185 cb = s->internal->info_callback;
186 else if (s->ctx->internal->info_callback != NULL)
187 cb = s->ctx->internal->info_callback;
188
189 if (SSL_IS_DTLS(s))
190 listen = D1I(s)->listen;
191
192 /* init things to blank */
193 s->internal->in_handshake++;
194 if (!SSL_in_init(s) || SSL_in_before(s))
195 SSL_clear(s);
196
197 if (SSL_IS_DTLS(s))
198 D1I(s)->listen = listen;
199
200 for (;;) {
201 state = S3I(s)->hs.state;
202
203 switch (S3I(s)->hs.state) {
204 case SSL_ST_RENEGOTIATE:
205 s->internal->renegotiate = 1;
206 /* S3I(s)->hs.state=SSL_ST_ACCEPT; */
207
208 case SSL_ST_BEFORE:
209 case SSL_ST_ACCEPT:
210 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
211 case SSL_ST_OK|SSL_ST_ACCEPT:
212 s->server = 1;
213 if (cb != NULL)
214 cb(s, SSL_CB_HANDSHAKE_START, 1);
215
216 if (SSL_IS_DTLS(s)) {
217 if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00)) {
218 SSLerror(s, ERR_R_INTERNAL_ERROR);
219 ret = -1;
220 goto end;
221 }
222 } else {
223 if ((s->version >> 8) != 3) {
224 SSLerror(s, ERR_R_INTERNAL_ERROR);
225 ret = -1;
226 goto end;
227 }
228 }
229 s->internal->type = SSL_ST_ACCEPT;
230
231 if (!ssl3_setup_init_buffer(s)) {
232 ret = -1;
233 goto end;
234 }
235 if (!ssl3_setup_buffers(s)) {
236 ret = -1;
237 goto end;
238 }
239
240 s->internal->init_num = 0;
241
242 if (S3I(s)->hs.state != SSL_ST_RENEGOTIATE) {
243 /*
244 * Ok, we now need to push on a buffering BIO
245 * so that the output is sent in a way that
246 * TCP likes :-)
247 */
248 if (!ssl_init_wbio_buffer(s, 1)) {
249 ret = -1;
250 goto end;
251 }
252
253 if (!tls1_transcript_init(s)) {
254 ret = -1;
255 goto end;
256 }
257
258 S3I(s)->hs.state = SSL3_ST_SR_CLNT_HELLO_A;
259 s->ctx->internal->stats.sess_accept++;
260 } else if (!SSL_IS_DTLS(s) && !S3I(s)->send_connection_binding) {
261 /*
262 * Server attempting to renegotiate with
263 * client that doesn't support secure
264 * renegotiation.
265 */
266 SSLerror(s, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
267 ssl3_send_alert(s, SSL3_AL_FATAL,
268 SSL_AD_HANDSHAKE_FAILURE);
269 ret = -1;
270 goto end;
271 } else {
272 /*
273 * S3I(s)->hs.state == SSL_ST_RENEGOTIATE,
274 * we will just send a HelloRequest.
275 */
276 s->ctx->internal->stats.sess_accept_renegotiate++;
277 S3I(s)->hs.state = SSL3_ST_SW_HELLO_REQ_A;
278 }
279 break;
280
281 case SSL3_ST_SW_HELLO_REQ_A:
282 case SSL3_ST_SW_HELLO_REQ_B:
283 s->internal->shutdown = 0;
284 if (SSL_IS_DTLS(s)) {
285 dtls1_clear_record_buffer(s);
286 dtls1_start_timer(s);
287 }
288 ret = ssl3_send_hello_request(s);
289 if (ret <= 0)
290 goto end;
291 if (SSL_IS_DTLS(s))
292 S3I(s)->hs.next_state = SSL3_ST_SR_CLNT_HELLO_A;
293 else
294 S3I(s)->hs.next_state = SSL3_ST_SW_HELLO_REQ_C;
295 S3I(s)->hs.state = SSL3_ST_SW_FLUSH;
296 s->internal->init_num = 0;
297
298 if (!tls1_transcript_init(s)) {
299 ret = -1;
300 goto end;
301 }
302 break;
303
304 case SSL3_ST_SW_HELLO_REQ_C:
305 S3I(s)->hs.state = SSL_ST_OK;
306 break;
307
308 case SSL3_ST_SR_CLNT_HELLO_A:
309 case SSL3_ST_SR_CLNT_HELLO_B:
310 case SSL3_ST_SR_CLNT_HELLO_C:
311 s->internal->shutdown = 0;
312 if (SSL_IS_DTLS(s)) {
313 ret = ssl3_get_client_hello(s);
314 if (ret <= 0)
315 goto end;
316 dtls1_stop_timer(s);
317
318 if (ret == 1 &&
319 (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE))
320 S3I(s)->hs.state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A;
321 else
322 S3I(s)->hs.state = SSL3_ST_SW_SRVR_HELLO_A;
323
324 s->internal->init_num = 0;
325
326 /*
327 * Reflect ClientHello sequence to remain
328 * stateless while listening.
329 */
330 if (listen) {
331 memcpy(S3I(s)->write_sequence,
332 S3I(s)->read_sequence,
333 sizeof(S3I(s)->write_sequence));
334 }
335
336 /* If we're just listening, stop here */
337 if (listen && S3I(s)->hs.state == SSL3_ST_SW_SRVR_HELLO_A) {
338 ret = 2;
339 D1I(s)->listen = 0;
340 /*
341 * Set expected sequence numbers to
342 * continue the handshake.
343 */
344 D1I(s)->handshake_read_seq = 2;
345 D1I(s)->handshake_write_seq = 1;
346 D1I(s)->next_handshake_write_seq = 1;
347 goto end;
348 }
349 } else {
350 if (s->internal->rwstate != SSL_X509_LOOKUP) {
351 ret = ssl3_get_client_hello(s);
352 if (ret <= 0)
353 goto end;
354 }
355
356 s->internal->renegotiate = 2;
357 S3I(s)->hs.state = SSL3_ST_SW_SRVR_HELLO_A;
358 s->internal->init_num = 0;
359 }
360 break;
361
362 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A:
363 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B:
364 ret = dtls1_send_hello_verify_request(s);
365 if (ret <= 0)
366 goto end;
367 S3I(s)->hs.state = SSL3_ST_SW_FLUSH;
368 S3I(s)->hs.next_state = SSL3_ST_SR_CLNT_HELLO_A;
369
370 /* HelloVerifyRequest resets Finished MAC. */
371 tls1_transcript_reset(s);
372 break;
373
374 case SSL3_ST_SW_SRVR_HELLO_A:
375 case SSL3_ST_SW_SRVR_HELLO_B:
376 if (SSL_IS_DTLS(s)) {
377 s->internal->renegotiate = 2;
378 dtls1_start_timer(s);
379 }
380 ret = ssl3_send_server_hello(s);
381 if (ret <= 0)
382 goto end;
383 if (s->internal->hit) {
384 if (s->internal->tlsext_ticket_expected)
385 S3I(s)->hs.state = SSL3_ST_SW_SESSION_TICKET_A;
386 else
387 S3I(s)->hs.state = SSL3_ST_SW_CHANGE_A;
388 } else {
389 S3I(s)->hs.state = SSL3_ST_SW_CERT_A;
390 }
391 s->internal->init_num = 0;
392 break;
393
394 case SSL3_ST_SW_CERT_A:
395 case SSL3_ST_SW_CERT_B:
396 /* Check if it is anon DH or anon ECDH. */
397 if (!(S3I(s)->hs.new_cipher->algorithm_auth &
398 SSL_aNULL)) {
399 if (SSL_IS_DTLS(s))
400 dtls1_start_timer(s);
401 ret = ssl3_send_server_certificate(s);
402 if (ret <= 0)
403 goto end;
404 if (s->internal->tlsext_status_expected)
405 S3I(s)->hs.state = SSL3_ST_SW_CERT_STATUS_A;
406 else
407 S3I(s)->hs.state = SSL3_ST_SW_KEY_EXCH_A;
408 } else {
409 skip = 1;
410 S3I(s)->hs.state = SSL3_ST_SW_KEY_EXCH_A;
411 }
412 s->internal->init_num = 0;
413 break;
414
415 case SSL3_ST_SW_KEY_EXCH_A:
416 case SSL3_ST_SW_KEY_EXCH_B:
417 alg_k = S3I(s)->hs.new_cipher->algorithm_mkey;
418
419 /*
420 * Only send if using a DH key exchange.
421 *
422 * For ECC ciphersuites, we send a ServerKeyExchange
423 * message only if the cipher suite is ECDHE. In other
424 * cases, the server certificate contains the server's
425 * public key for key exchange.
426 */
427 if (alg_k & (SSL_kDHE|SSL_kECDHE)) {
428 if (SSL_IS_DTLS(s))
429 dtls1_start_timer(s);
430 ret = ssl3_send_server_key_exchange(s);
431 if (ret <= 0)
432 goto end;
433 } else
434 skip = 1;
435
436 S3I(s)->hs.state = SSL3_ST_SW_CERT_REQ_A;
437 s->internal->init_num = 0;
438 break;
439
440 case SSL3_ST_SW_CERT_REQ_A:
441 case SSL3_ST_SW_CERT_REQ_B:
442 /*
443 * Determine whether or not we need to request a
444 * certificate.
445 *
446 * Do not request a certificate if:
447 *
448 * - We did not ask for it (SSL_VERIFY_PEER is unset).
449 *
450 * - SSL_VERIFY_CLIENT_ONCE is set and we are
451 * renegotiating.
452 *
453 * - We are using an anonymous ciphersuites
454 * (see section "Certificate request" in SSL 3 drafts
455 * and in RFC 2246) ... except when the application
456 * insists on verification (against the specs, but
457 * s3_clnt.c accepts this for SSL 3).
458 */
459 if (!(s->verify_mode & SSL_VERIFY_PEER) ||
460 ((s->session->peer != NULL) &&
461 (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
462 ((S3I(s)->hs.new_cipher->algorithm_auth &
463 SSL_aNULL) && !(s->verify_mode &
464 SSL_VERIFY_FAIL_IF_NO_PEER_CERT))) {
465 /* No cert request. */
466 skip = 1;
467 S3I(s)->tmp.cert_request = 0;
468 S3I(s)->hs.state = SSL3_ST_SW_SRVR_DONE_A;
469
470 if (!SSL_IS_DTLS(s))
471 tls1_transcript_free(s);
472 } else {
473 S3I(s)->tmp.cert_request = 1;
474 if (SSL_IS_DTLS(s))
475 dtls1_start_timer(s);
476 ret = ssl3_send_certificate_request(s);
477 if (ret <= 0)
478 goto end;
479 S3I(s)->hs.state = SSL3_ST_SW_SRVR_DONE_A;
480 s->internal->init_num = 0;
481 }
482 break;
483
484 case SSL3_ST_SW_SRVR_DONE_A:
485 case SSL3_ST_SW_SRVR_DONE_B:
486 if (SSL_IS_DTLS(s))
487 dtls1_start_timer(s);
488 ret = ssl3_send_server_done(s);
489 if (ret <= 0)
490 goto end;
491 S3I(s)->hs.next_state = SSL3_ST_SR_CERT_A;
492 S3I(s)->hs.state = SSL3_ST_SW_FLUSH;
493 s->internal->init_num = 0;
494 break;
495
496 case SSL3_ST_SW_FLUSH:
497 /*
498 * This code originally checked to see if
499 * any data was pending using BIO_CTRL_INFO
500 * and then flushed. This caused problems
501 * as documented in PR#1939. The proposed
502 * fix doesn't completely resolve this issue
503 * as buggy implementations of BIO_CTRL_PENDING
504 * still exist. So instead we just flush
505 * unconditionally.
506 */
507 s->internal->rwstate = SSL_WRITING;
508 if (BIO_flush(s->wbio) <= 0) {
509 if (SSL_IS_DTLS(s)) {
510 /* If the write error was fatal, stop trying. */
511 if (!BIO_should_retry(s->wbio)) {
512 s->internal->rwstate = SSL_NOTHING;
513 S3I(s)->hs.state = S3I(s)->hs.next_state;
514 }
515 }
516 ret = -1;
517 goto end;
518 }
519 s->internal->rwstate = SSL_NOTHING;
520 S3I(s)->hs.state = S3I(s)->hs.next_state;
521 break;
522
523 case SSL3_ST_SR_CERT_A:
524 case SSL3_ST_SR_CERT_B:
525 if (S3I(s)->tmp.cert_request) {
526 ret = ssl3_get_client_certificate(s);
527 if (ret <= 0)
528 goto end;
529 }
530 s->internal->init_num = 0;
531 S3I(s)->hs.state = SSL3_ST_SR_KEY_EXCH_A;
532 break;
533
534 case SSL3_ST_SR_KEY_EXCH_A:
535 case SSL3_ST_SR_KEY_EXCH_B:
536 ret = ssl3_get_client_key_exchange(s);
537 if (ret <= 0)
538 goto end;
539
540 if (SSL_IS_DTLS(s)) {
541 S3I(s)->hs.state = SSL3_ST_SR_CERT_VRFY_A;
542 s->internal->init_num = 0;
543 }
544
545 alg_k = S3I(s)->hs.new_cipher->algorithm_mkey;
546 if (ret == 2) {
547 /*
548 * For the ECDH ciphersuites when
549 * the client sends its ECDH pub key in
550 * a certificate, the CertificateVerify
551 * message is not sent.
552 * Also for GOST ciphersuites when
553 * the client uses its key from the certificate
554 * for key exchange.
555 */
556 S3I(s)->hs.state = SSL3_ST_SR_FINISHED_A;
557 s->internal->init_num = 0;
558 } else if (SSL_USE_SIGALGS(s) || (alg_k & SSL_kGOST)) {
559 S3I(s)->hs.state = SSL3_ST_SR_CERT_VRFY_A;
560 s->internal->init_num = 0;
561 if (!s->session->peer)
562 break;
563 /*
564 * Freeze the transcript for use during client
565 * certificate verification.
566 */
567 tls1_transcript_freeze(s);
568 } else {
569 S3I(s)->hs.state = SSL3_ST_SR_CERT_VRFY_A;
570 s->internal->init_num = 0;
571
572 tls1_transcript_free(s);
573
574 /*
575 * We need to get hashes here so if there is
576 * a client cert, it can be verified.
577 */
578 if (!tls1_transcript_hash_value(s,
579 S3I(s)->tmp.cert_verify_md,
580 sizeof(S3I(s)->tmp.cert_verify_md),
581 NULL)) {
582 ret = -1;
583 goto end;
584 }
585 }
586 break;
587
588 case SSL3_ST_SR_CERT_VRFY_A:
589 case SSL3_ST_SR_CERT_VRFY_B:
590 if (SSL_IS_DTLS(s))
591 D1I(s)->change_cipher_spec_ok = 1;
592 else
593 s->s3->flags |= SSL3_FLAGS_CCS_OK;
594
595 /* we should decide if we expected this one */
596 ret = ssl3_get_cert_verify(s);
597 if (ret <= 0)
598 goto end;
599 S3I(s)->hs.state = SSL3_ST_SR_FINISHED_A;
600 s->internal->init_num = 0;
601 break;
602
603 case SSL3_ST_SR_FINISHED_A:
604 case SSL3_ST_SR_FINISHED_B:
605 if (SSL_IS_DTLS(s))
606 D1I(s)->change_cipher_spec_ok = 1;
607 else
608 s->s3->flags |= SSL3_FLAGS_CCS_OK;
609 ret = ssl3_get_finished(s, SSL3_ST_SR_FINISHED_A,
610 SSL3_ST_SR_FINISHED_B);
611 if (ret <= 0)
612 goto end;
613 if (SSL_IS_DTLS(s))
614 dtls1_stop_timer(s);
615 if (s->internal->hit)
616 S3I(s)->hs.state = SSL_ST_OK;
617 else if (s->internal->tlsext_ticket_expected)
618 S3I(s)->hs.state = SSL3_ST_SW_SESSION_TICKET_A;
619 else
620 S3I(s)->hs.state = SSL3_ST_SW_CHANGE_A;
621 s->internal->init_num = 0;
622 break;
623
624 case SSL3_ST_SW_SESSION_TICKET_A:
625 case SSL3_ST_SW_SESSION_TICKET_B:
626 ret = ssl3_send_newsession_ticket(s);
627 if (ret <= 0)
628 goto end;
629 S3I(s)->hs.state = SSL3_ST_SW_CHANGE_A;
630 s->internal->init_num = 0;
631 break;
632
633 case SSL3_ST_SW_CERT_STATUS_A:
634 case SSL3_ST_SW_CERT_STATUS_B:
635 ret = ssl3_send_cert_status(s);
636 if (ret <= 0)
637 goto end;
638 S3I(s)->hs.state = SSL3_ST_SW_KEY_EXCH_A;
639 s->internal->init_num = 0;
640 break;
641
642 case SSL3_ST_SW_CHANGE_A:
643 case SSL3_ST_SW_CHANGE_B:
644 s->session->cipher = S3I(s)->hs.new_cipher;
645 if (!tls1_setup_key_block(s)) {
646 ret = -1;
647 goto end;
648 }
649
650 ret = ssl3_send_change_cipher_spec(s,
651 SSL3_ST_SW_CHANGE_A, SSL3_ST_SW_CHANGE_B);
652 if (ret <= 0)
653 goto end;
654 S3I(s)->hs.state = SSL3_ST_SW_FINISHED_A;
655 s->internal->init_num = 0;
656
657 if (!tls1_change_cipher_state(s,
658 SSL3_CHANGE_CIPHER_SERVER_WRITE)) {
659 ret = -1;
660 goto end;
661 }
662
663 if (SSL_IS_DTLS(s))
664 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
665 break;
666
667 case SSL3_ST_SW_FINISHED_A:
668 case SSL3_ST_SW_FINISHED_B:
669 ret = ssl3_send_finished(s,
670 SSL3_ST_SW_FINISHED_A, SSL3_ST_SW_FINISHED_B,
671 TLS_MD_SERVER_FINISH_CONST,
672 TLS_MD_SERVER_FINISH_CONST_SIZE);
673 if (ret <= 0)
674 goto end;
675 S3I(s)->hs.state = SSL3_ST_SW_FLUSH;
676 if (s->internal->hit) {
677 S3I(s)->hs.next_state = SSL3_ST_SR_FINISHED_A;
678 tls1_transcript_free(s);
679 } else
680 S3I(s)->hs.next_state = SSL_ST_OK;
681 s->internal->init_num = 0;
682 break;
683
684 case SSL_ST_OK:
685 /* clean a few things up */
686 tls1_cleanup_key_block(s);
687
688 if (S3I(s)->handshake_transcript != NULL) {
689 SSLerror(s, ERR_R_INTERNAL_ERROR);
690 ret = -1;
691 goto end;
692 }
693
694 if (!SSL_IS_DTLS(s))
695 ssl3_release_init_buffer(s);
696
697 /* remove buffering on output */
698 ssl_free_wbio_buffer(s);
699
700 s->internal->init_num = 0;
701
702 /* Skipped if we just sent a HelloRequest. */
703 if (s->internal->renegotiate == 2) {
704 s->internal->renegotiate = 0;
705 s->internal->new_session = 0;
706
707 ssl_update_cache(s, SSL_SESS_CACHE_SERVER);
708
709 s->ctx->internal->stats.sess_accept_good++;
710 /* s->server=1; */
711 s->internal->handshake_func = ssl3_accept;
712
713 if (cb != NULL)
714 cb(s, SSL_CB_HANDSHAKE_DONE, 1);
715 }
716
717 ret = 1;
718
719 if (SSL_IS_DTLS(s)) {
720 /* Done handshaking, next message is client hello. */
721 D1I(s)->handshake_read_seq = 0;
722 /* Next message is server hello. */
723 D1I(s)->handshake_write_seq = 0;
724 D1I(s)->next_handshake_write_seq = 0;
725 }
726 goto end;
727 /* break; */
728
729 default:
730 SSLerror(s, SSL_R_UNKNOWN_STATE);
731 ret = -1;
732 goto end;
733 /* break; */
734 }
735
736 if (!S3I(s)->tmp.reuse_message && !skip) {
737 if (s->internal->debug) {
738 if ((ret = BIO_flush(s->wbio)) <= 0)
739 goto end;
740 }
741
742
743 if ((cb != NULL) && (S3I(s)->hs.state != state)) {
744 new_state = S3I(s)->hs.state;
745 S3I(s)->hs.state = state;
746 cb(s, SSL_CB_ACCEPT_LOOP, 1);
747 S3I(s)->hs.state = new_state;
748 }
749 }
750 skip = 0;
751 }
752 end:
753 /* BIO_flush(s->wbio); */
754 s->internal->in_handshake--;
755 if (cb != NULL)
756 cb(s, SSL_CB_ACCEPT_EXIT, ret);
757
758 return (ret);
759 }
760
761 int
ssl3_send_hello_request(SSL * s)762 ssl3_send_hello_request(SSL *s)
763 {
764 CBB cbb, hello;
765
766 memset(&cbb, 0, sizeof(cbb));
767
768 if (S3I(s)->hs.state == SSL3_ST_SW_HELLO_REQ_A) {
769 if (!ssl3_handshake_msg_start(s, &cbb, &hello,
770 SSL3_MT_HELLO_REQUEST))
771 goto err;
772 if (!ssl3_handshake_msg_finish(s, &cbb))
773 goto err;
774
775 S3I(s)->hs.state = SSL3_ST_SW_HELLO_REQ_B;
776 }
777
778 /* SSL3_ST_SW_HELLO_REQ_B */
779 return (ssl3_handshake_write(s));
780
781 err:
782 CBB_cleanup(&cbb);
783
784 return (-1);
785 }
786
787 int
ssl3_get_client_hello(SSL * s)788 ssl3_get_client_hello(SSL *s)
789 {
790 CBS cbs, client_random, session_id, cookie, cipher_suites;
791 CBS compression_methods;
792 uint16_t client_version;
793 uint8_t comp_method;
794 int comp_null;
795 int i, j, ok, al, ret = -1, cookie_valid = 0;
796 long n;
797 unsigned long id;
798 SSL_CIPHER *c;
799 STACK_OF(SSL_CIPHER) *ciphers = NULL;
800 unsigned long alg_k;
801 const SSL_METHOD *method;
802 uint16_t max_version, shared_version;
803
804 /*
805 * We do this so that we will respond with our native type.
806 * If we are TLSv1 and we get SSLv3, we will respond with TLSv1,
807 * This down switching should be handled by a different method.
808 * If we are SSLv3, we will respond with SSLv3, even if prompted with
809 * TLSv1.
810 */
811 if (S3I(s)->hs.state == SSL3_ST_SR_CLNT_HELLO_A) {
812 S3I(s)->hs.state = SSL3_ST_SR_CLNT_HELLO_B;
813 }
814
815 s->internal->first_packet = 1;
816 n = ssl3_get_message(s, SSL3_ST_SR_CLNT_HELLO_B,
817 SSL3_ST_SR_CLNT_HELLO_C, SSL3_MT_CLIENT_HELLO,
818 SSL3_RT_MAX_PLAIN_LENGTH, &ok);
819 if (!ok)
820 return ((int)n);
821 s->internal->first_packet = 0;
822
823 if (n < 0)
824 goto err;
825
826 CBS_init(&cbs, s->internal->init_msg, n);
827
828 /* Parse client hello up until the extensions (if any). */
829 if (!CBS_get_u16(&cbs, &client_version))
830 goto truncated;
831 if (!CBS_get_bytes(&cbs, &client_random, SSL3_RANDOM_SIZE))
832 goto truncated;
833 if (!CBS_get_u8_length_prefixed(&cbs, &session_id))
834 goto truncated;
835 if (CBS_len(&session_id) > SSL3_SESSION_ID_SIZE) {
836 al = SSL_AD_ILLEGAL_PARAMETER;
837 SSLerror(s, SSL_R_SSL3_SESSION_ID_TOO_LONG);
838 goto f_err;
839 }
840 if (SSL_IS_DTLS(s)) {
841 if (!CBS_get_u8_length_prefixed(&cbs, &cookie))
842 goto truncated;
843 }
844 if (!CBS_get_u16_length_prefixed(&cbs, &cipher_suites))
845 goto truncated;
846 if (!CBS_get_u8_length_prefixed(&cbs, &compression_methods))
847 goto truncated;
848
849 /*
850 * Use version from inside client hello, not from record header.
851 * (may differ: see RFC 2246, Appendix E, second paragraph)
852 */
853 if (!ssl_downgrade_max_version(s, &max_version))
854 goto err;
855 if (ssl_max_shared_version(s, client_version, &shared_version) != 1) {
856 SSLerror(s, SSL_R_WRONG_VERSION_NUMBER);
857 if ((s->client_version >> 8) == SSL3_VERSION_MAJOR &&
858 !s->internal->enc_write_ctx && !s->internal->write_hash) {
859 /*
860 * Similar to ssl3_get_record, send alert using remote
861 * version number.
862 */
863 s->version = s->client_version;
864 }
865 al = SSL_AD_PROTOCOL_VERSION;
866 goto f_err;
867 }
868 s->client_version = client_version;
869 s->version = shared_version;
870
871 if ((method = ssl_get_server_method(shared_version)) == NULL) {
872 SSLerror(s, ERR_R_INTERNAL_ERROR);
873 goto err;
874 }
875 s->method = method;
876
877 /*
878 * If we require cookies (DTLS) and this ClientHello does not contain
879 * one, just return since we do not want to allocate any memory yet.
880 * So check cookie length...
881 */
882 if (SSL_IS_DTLS(s)) {
883 if (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) {
884 if (CBS_len(&cookie) == 0)
885 return (1);
886 }
887 }
888
889 if (!CBS_write_bytes(&client_random, s->s3->client_random,
890 sizeof(s->s3->client_random), NULL))
891 goto err;
892
893 s->internal->hit = 0;
894
895 /*
896 * Versions before 0.9.7 always allow clients to resume sessions in
897 * renegotiation. 0.9.7 and later allow this by default, but optionally
898 * ignore resumption requests with flag
899 * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION (it's a new flag
900 * rather than a change to default behavior so that applications
901 * relying on this for security won't even compile against older
902 * library versions).
903 *
904 * 1.0.1 and later also have a function SSL_renegotiate_abbreviated()
905 * to request renegotiation but not a new session (s->internal->new_session
906 * remains unset): for servers, this essentially just means that the
907 * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION setting will be
908 * ignored.
909 */
910 if ((s->internal->new_session && (s->internal->options &
911 SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION))) {
912 if (!ssl_get_new_session(s, 1))
913 goto err;
914 } else {
915 CBS ext_block;
916
917 CBS_dup(&cbs, &ext_block);
918
919 i = ssl_get_prev_session(s, &session_id, &ext_block, &al);
920 if (i == 1) { /* previous session */
921 s->internal->hit = 1;
922 } else if (i == -1)
923 goto f_err;
924 else {
925 /* i == 0 */
926 if (!ssl_get_new_session(s, 1))
927 goto err;
928 }
929 }
930
931 if (SSL_IS_DTLS(s)) {
932 /*
933 * The ClientHello may contain a cookie even if the HelloVerify
934 * message has not been sent - make sure that it does not cause
935 * an overflow.
936 */
937 if (CBS_len(&cookie) > sizeof(D1I(s)->rcvd_cookie)) {
938 al = SSL_AD_DECODE_ERROR;
939 SSLerror(s, SSL_R_COOKIE_MISMATCH);
940 goto f_err;
941 }
942
943 /* Verify the cookie if appropriate option is set. */
944 if ((SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) &&
945 CBS_len(&cookie) > 0) {
946 size_t cookie_len;
947
948 /* XXX - rcvd_cookie seems to only be used here... */
949 if (!CBS_write_bytes(&cookie, D1I(s)->rcvd_cookie,
950 sizeof(D1I(s)->rcvd_cookie), &cookie_len))
951 goto err;
952
953 if (s->ctx->internal->app_verify_cookie_cb != NULL) {
954 if (s->ctx->internal->app_verify_cookie_cb(s,
955 D1I(s)->rcvd_cookie, cookie_len) == 0) {
956 al = SSL_AD_HANDSHAKE_FAILURE;
957 SSLerror(s, SSL_R_COOKIE_MISMATCH);
958 goto f_err;
959 }
960 /* else cookie verification succeeded */
961 /* XXX - can d1->cookie_len > sizeof(rcvd_cookie) ? */
962 } else if (timingsafe_memcmp(D1I(s)->rcvd_cookie,
963 D1I(s)->cookie, D1I(s)->cookie_len) != 0) {
964 /* default verification */
965 al = SSL_AD_HANDSHAKE_FAILURE;
966 SSLerror(s, SSL_R_COOKIE_MISMATCH);
967 goto f_err;
968 }
969 cookie_valid = 1;
970 }
971 }
972
973 /* XXX - This logic seems wrong... */
974 if (CBS_len(&cipher_suites) == 0 && CBS_len(&session_id) != 0) {
975 /* we need a cipher if we are not resuming a session */
976 al = SSL_AD_ILLEGAL_PARAMETER;
977 SSLerror(s, SSL_R_NO_CIPHERS_SPECIFIED);
978 goto f_err;
979 }
980
981 if (CBS_len(&cipher_suites) > 0) {
982 if ((ciphers = ssl_bytes_to_cipher_list(s,
983 &cipher_suites)) == NULL)
984 goto err;
985 }
986
987 /* If it is a hit, check that the cipher is in the list */
988 /* XXX - CBS_len(&cipher_suites) will always be zero here... */
989 if (s->internal->hit && CBS_len(&cipher_suites) > 0) {
990 j = 0;
991 id = s->session->cipher->id;
992
993 for (i = 0; i < sk_SSL_CIPHER_num(ciphers); i++) {
994 c = sk_SSL_CIPHER_value(ciphers, i);
995 if (c->id == id) {
996 j = 1;
997 break;
998 }
999 }
1000 if (j == 0) {
1001 /*
1002 * We need to have the cipher in the cipher
1003 * list if we are asked to reuse it
1004 */
1005 al = SSL_AD_ILLEGAL_PARAMETER;
1006 SSLerror(s, SSL_R_REQUIRED_CIPHER_MISSING);
1007 goto f_err;
1008 }
1009 }
1010
1011 comp_null = 0;
1012 while (CBS_len(&compression_methods) > 0) {
1013 if (!CBS_get_u8(&compression_methods, &comp_method))
1014 goto truncated;
1015 if (comp_method == 0)
1016 comp_null = 1;
1017 }
1018 if (comp_null == 0) {
1019 al = SSL_AD_DECODE_ERROR;
1020 SSLerror(s, SSL_R_NO_COMPRESSION_SPECIFIED);
1021 goto f_err;
1022 }
1023
1024 if (!tlsext_server_parse(s, SSL_TLSEXT_MSG_CH, &cbs, &al)) {
1025 SSLerror(s, SSL_R_PARSE_TLSEXT);
1026 goto f_err;
1027 }
1028
1029 if (!S3I(s)->renegotiate_seen && s->internal->renegotiate) {
1030 al = SSL_AD_HANDSHAKE_FAILURE;
1031 SSLerror(s, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
1032 goto f_err;
1033 }
1034
1035 if (ssl_check_clienthello_tlsext_early(s) <= 0) {
1036 SSLerror(s, SSL_R_CLIENTHELLO_TLSEXT);
1037 goto err;
1038 }
1039
1040 /*
1041 * Check if we want to use external pre-shared secret for this
1042 * handshake for not reused session only. We need to generate
1043 * server_random before calling tls_session_secret_cb in order to allow
1044 * SessionTicket processing to use it in key derivation.
1045 */
1046 arc4random_buf(s->s3->server_random, SSL3_RANDOM_SIZE);
1047
1048 if (!SSL_IS_DTLS(s) && max_version >= TLS1_2_VERSION &&
1049 s->version < max_version) {
1050 /*
1051 * RFC 8446 section 4.1.3. If we are downgrading from TLS 1.3
1052 * we must set the last 8 bytes of the server random to magical
1053 * values to indicate we meant to downgrade. For TLS 1.2 it is
1054 * recommended that we do the same.
1055 */
1056 size_t index = SSL3_RANDOM_SIZE - sizeof(tls13_downgrade_12);
1057 uint8_t *magic = &s->s3->server_random[index];
1058 if (s->version == TLS1_2_VERSION) {
1059 /* Indicate we chose to downgrade to 1.2. */
1060 memcpy(magic, tls13_downgrade_12,
1061 sizeof(tls13_downgrade_12));
1062 } else {
1063 /* Indicate we chose to downgrade to 1.1 or lower */
1064 memcpy(magic, tls13_downgrade_11,
1065 sizeof(tls13_downgrade_11));
1066 }
1067 }
1068
1069 if (!s->internal->hit && s->internal->tls_session_secret_cb) {
1070 SSL_CIPHER *pref_cipher = NULL;
1071
1072 s->session->master_key_length = sizeof(s->session->master_key);
1073 if (s->internal->tls_session_secret_cb(s, s->session->master_key,
1074 &s->session->master_key_length, ciphers, &pref_cipher,
1075 s->internal->tls_session_secret_cb_arg)) {
1076 s->internal->hit = 1;
1077 s->session->ciphers = ciphers;
1078 s->session->verify_result = X509_V_OK;
1079
1080 ciphers = NULL;
1081
1082 /* check if some cipher was preferred by call back */
1083 pref_cipher = pref_cipher ? pref_cipher :
1084 ssl3_choose_cipher(s, s->session->ciphers,
1085 SSL_get_ciphers(s));
1086 if (pref_cipher == NULL) {
1087 al = SSL_AD_HANDSHAKE_FAILURE;
1088 SSLerror(s, SSL_R_NO_SHARED_CIPHER);
1089 goto f_err;
1090 }
1091
1092 s->session->cipher = pref_cipher;
1093
1094 sk_SSL_CIPHER_free(s->cipher_list);
1095 s->cipher_list = sk_SSL_CIPHER_dup(s->session->ciphers);
1096 }
1097 }
1098
1099 /*
1100 * Given s->session->ciphers and SSL_get_ciphers, we must
1101 * pick a cipher
1102 */
1103
1104 if (!s->internal->hit) {
1105 sk_SSL_CIPHER_free(s->session->ciphers);
1106 s->session->ciphers = ciphers;
1107 if (ciphers == NULL) {
1108 al = SSL_AD_ILLEGAL_PARAMETER;
1109 SSLerror(s, SSL_R_NO_CIPHERS_PASSED);
1110 goto f_err;
1111 }
1112 ciphers = NULL;
1113 c = ssl3_choose_cipher(s, s->session->ciphers,
1114 SSL_get_ciphers(s));
1115
1116 if (c == NULL) {
1117 al = SSL_AD_HANDSHAKE_FAILURE;
1118 SSLerror(s, SSL_R_NO_SHARED_CIPHER);
1119 goto f_err;
1120 }
1121 S3I(s)->hs.new_cipher = c;
1122 } else {
1123 S3I(s)->hs.new_cipher = s->session->cipher;
1124 }
1125
1126 if (!tls1_transcript_hash_init(s))
1127 goto err;
1128
1129 alg_k = S3I(s)->hs.new_cipher->algorithm_mkey;
1130 if (!(SSL_USE_SIGALGS(s) || (alg_k & SSL_kGOST)) ||
1131 !(s->verify_mode & SSL_VERIFY_PEER))
1132 tls1_transcript_free(s);
1133
1134 /*
1135 * We now have the following setup.
1136 * client_random
1137 * cipher_list - our prefered list of ciphers
1138 * ciphers - the clients prefered list of ciphers
1139 * compression - basically ignored right now
1140 * ssl version is set - sslv3
1141 * s->session - The ssl session has been setup.
1142 * s->internal->hit - session reuse flag
1143 * s->hs.new_cipher - the new cipher to use.
1144 */
1145
1146 /* Handles TLS extensions that we couldn't check earlier */
1147 if (ssl_check_clienthello_tlsext_late(s) <= 0) {
1148 SSLerror(s, SSL_R_CLIENTHELLO_TLSEXT);
1149 goto err;
1150 }
1151
1152 ret = cookie_valid ? 2 : 1;
1153
1154 if (0) {
1155 truncated:
1156 al = SSL_AD_DECODE_ERROR;
1157 SSLerror(s, SSL_R_BAD_PACKET_LENGTH);
1158 f_err:
1159 ssl3_send_alert(s, SSL3_AL_FATAL, al);
1160 }
1161 err:
1162 sk_SSL_CIPHER_free(ciphers);
1163
1164 return (ret);
1165 }
1166
1167 int
ssl3_send_server_hello(SSL * s)1168 ssl3_send_server_hello(SSL *s)
1169 {
1170 CBB cbb, server_hello, session_id;
1171 size_t sl;
1172
1173 memset(&cbb, 0, sizeof(cbb));
1174
1175 if (S3I(s)->hs.state == SSL3_ST_SW_SRVR_HELLO_A) {
1176 if (!ssl3_handshake_msg_start(s, &cbb, &server_hello,
1177 SSL3_MT_SERVER_HELLO))
1178 goto err;
1179
1180 if (!CBB_add_u16(&server_hello, s->version))
1181 goto err;
1182 if (!CBB_add_bytes(&server_hello, s->s3->server_random,
1183 sizeof(s->s3->server_random)))
1184 goto err;
1185
1186 /*
1187 * There are several cases for the session ID to send
1188 * back in the server hello:
1189 *
1190 * - For session reuse from the session cache,
1191 * we send back the old session ID.
1192 * - If stateless session reuse (using a session ticket)
1193 * is successful, we send back the client's "session ID"
1194 * (which doesn't actually identify the session).
1195 * - If it is a new session, we send back the new
1196 * session ID.
1197 * - However, if we want the new session to be single-use,
1198 * we send back a 0-length session ID.
1199 *
1200 * s->internal->hit is non-zero in either case of session reuse,
1201 * so the following won't overwrite an ID that we're supposed
1202 * to send back.
1203 */
1204 if (!(s->ctx->internal->session_cache_mode & SSL_SESS_CACHE_SERVER)
1205 && !s->internal->hit)
1206 s->session->session_id_length = 0;
1207
1208 sl = s->session->session_id_length;
1209 if (sl > sizeof(s->session->session_id)) {
1210 SSLerror(s, ERR_R_INTERNAL_ERROR);
1211 goto err;
1212 }
1213 if (!CBB_add_u8_length_prefixed(&server_hello, &session_id))
1214 goto err;
1215 if (!CBB_add_bytes(&session_id, s->session->session_id, sl))
1216 goto err;
1217
1218 /* Cipher suite. */
1219 if (!CBB_add_u16(&server_hello,
1220 ssl3_cipher_get_value(S3I(s)->hs.new_cipher)))
1221 goto err;
1222
1223 /* Compression method (null). */
1224 if (!CBB_add_u8(&server_hello, 0))
1225 goto err;
1226
1227 /* TLS extensions */
1228 if (!tlsext_server_build(s, SSL_TLSEXT_MSG_SH, &server_hello)) {
1229 SSLerror(s, ERR_R_INTERNAL_ERROR);
1230 goto err;
1231 }
1232
1233 if (!ssl3_handshake_msg_finish(s, &cbb))
1234 goto err;
1235 }
1236
1237 /* SSL3_ST_SW_SRVR_HELLO_B */
1238 return (ssl3_handshake_write(s));
1239
1240 err:
1241 CBB_cleanup(&cbb);
1242
1243 return (-1);
1244 }
1245
1246 int
ssl3_send_server_done(SSL * s)1247 ssl3_send_server_done(SSL *s)
1248 {
1249 CBB cbb, done;
1250
1251 memset(&cbb, 0, sizeof(cbb));
1252
1253 if (S3I(s)->hs.state == SSL3_ST_SW_SRVR_DONE_A) {
1254 if (!ssl3_handshake_msg_start(s, &cbb, &done,
1255 SSL3_MT_SERVER_DONE))
1256 goto err;
1257 if (!ssl3_handshake_msg_finish(s, &cbb))
1258 goto err;
1259
1260 S3I(s)->hs.state = SSL3_ST_SW_SRVR_DONE_B;
1261 }
1262
1263 /* SSL3_ST_SW_SRVR_DONE_B */
1264 return (ssl3_handshake_write(s));
1265
1266 err:
1267 CBB_cleanup(&cbb);
1268
1269 return (-1);
1270 }
1271
1272 static int
ssl3_send_server_kex_dhe(SSL * s,CBB * cbb)1273 ssl3_send_server_kex_dhe(SSL *s, CBB *cbb)
1274 {
1275 CBB dh_p, dh_g, dh_Ys;
1276 DH *dh = NULL, *dhp;
1277 unsigned char *data;
1278 int al;
1279
1280 if (s->cert->dh_tmp_auto != 0) {
1281 if ((dhp = ssl_get_auto_dh(s)) == NULL) {
1282 al = SSL_AD_INTERNAL_ERROR;
1283 SSLerror(s, ERR_R_INTERNAL_ERROR);
1284 goto f_err;
1285 }
1286 } else
1287 dhp = s->cert->dh_tmp;
1288
1289 if (dhp == NULL && s->cert->dh_tmp_cb != NULL)
1290 dhp = s->cert->dh_tmp_cb(s, 0,
1291 SSL_C_PKEYLENGTH(S3I(s)->hs.new_cipher));
1292
1293 if (dhp == NULL) {
1294 al = SSL_AD_HANDSHAKE_FAILURE;
1295 SSLerror(s, SSL_R_MISSING_TMP_DH_KEY);
1296 goto f_err;
1297 }
1298
1299 if (S3I(s)->tmp.dh != NULL) {
1300 SSLerror(s, ERR_R_INTERNAL_ERROR);
1301 goto err;
1302 }
1303
1304 if (s->cert->dh_tmp_auto != 0) {
1305 dh = dhp;
1306 } else if ((dh = DHparams_dup(dhp)) == NULL) {
1307 SSLerror(s, ERR_R_DH_LIB);
1308 goto err;
1309 }
1310 S3I(s)->tmp.dh = dh;
1311 if (!DH_generate_key(dh)) {
1312 SSLerror(s, ERR_R_DH_LIB);
1313 goto err;
1314 }
1315
1316 /*
1317 * Serialize the DH parameters and public key.
1318 */
1319 if (!CBB_add_u16_length_prefixed(cbb, &dh_p))
1320 goto err;
1321 if (!CBB_add_space(&dh_p, &data, BN_num_bytes(dh->p)))
1322 goto err;
1323 BN_bn2bin(dh->p, data);
1324
1325 if (!CBB_add_u16_length_prefixed(cbb, &dh_g))
1326 goto err;
1327 if (!CBB_add_space(&dh_g, &data, BN_num_bytes(dh->g)))
1328 goto err;
1329 BN_bn2bin(dh->g, data);
1330
1331 if (!CBB_add_u16_length_prefixed(cbb, &dh_Ys))
1332 goto err;
1333 if (!CBB_add_space(&dh_Ys, &data, BN_num_bytes(dh->pub_key)))
1334 goto err;
1335 BN_bn2bin(dh->pub_key, data);
1336
1337 if (!CBB_flush(cbb))
1338 goto err;
1339
1340 return (1);
1341
1342 f_err:
1343 ssl3_send_alert(s, SSL3_AL_FATAL, al);
1344 err:
1345 return (-1);
1346 }
1347
1348 static int
ssl3_send_server_kex_ecdhe_ecp(SSL * s,int nid,CBB * cbb)1349 ssl3_send_server_kex_ecdhe_ecp(SSL *s, int nid, CBB *cbb)
1350 {
1351 uint16_t curve_id;
1352 EC_KEY *ecdh;
1353 CBB ecpoint;
1354 int al;
1355
1356 /*
1357 * Only named curves are supported in ECDH ephemeral key exchanges.
1358 * For supported named curves, curve_id is non-zero.
1359 */
1360 if ((curve_id = tls1_ec_nid2curve_id(nid)) == 0) {
1361 SSLerror(s, SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1362 goto err;
1363 }
1364
1365 if (S3I(s)->tmp.ecdh != NULL) {
1366 SSLerror(s, ERR_R_INTERNAL_ERROR);
1367 goto err;
1368 }
1369
1370 if ((S3I(s)->tmp.ecdh = EC_KEY_new()) == NULL) {
1371 al = SSL_AD_HANDSHAKE_FAILURE;
1372 SSLerror(s, SSL_R_MISSING_TMP_ECDH_KEY);
1373 goto f_err;
1374 }
1375 S3I(s)->tmp.ecdh_nid = nid;
1376 ecdh = S3I(s)->tmp.ecdh;
1377
1378 if (!ssl_kex_generate_ecdhe_ecp(ecdh, nid))
1379 goto err;
1380
1381 /*
1382 * Encode the public key.
1383 *
1384 * Only named curves are supported in ECDH ephemeral key exchanges.
1385 * In this case the ServerKeyExchange message has:
1386 * [1 byte CurveType], [2 byte CurveName]
1387 * [1 byte length of encoded point], followed by
1388 * the actual encoded point itself.
1389 */
1390 if (!CBB_add_u8(cbb, NAMED_CURVE_TYPE))
1391 goto err;
1392 if (!CBB_add_u16(cbb, curve_id))
1393 goto err;
1394 if (!CBB_add_u8_length_prefixed(cbb, &ecpoint))
1395 goto err;
1396 if (!ssl_kex_public_ecdhe_ecp(ecdh, &ecpoint))
1397 goto err;
1398 if (!CBB_flush(cbb))
1399 goto err;
1400
1401 return (1);
1402
1403 f_err:
1404 ssl3_send_alert(s, SSL3_AL_FATAL, al);
1405 err:
1406 return (-1);
1407 }
1408
1409 static int
ssl3_send_server_kex_ecdhe_ecx(SSL * s,int nid,CBB * cbb)1410 ssl3_send_server_kex_ecdhe_ecx(SSL *s, int nid, CBB *cbb)
1411 {
1412 uint8_t *public_key = NULL, *private_key = NULL;
1413 uint16_t curve_id;
1414 CBB ecpoint;
1415 int ret = -1;
1416
1417 /* Generate an X25519 key pair. */
1418 if (S3I(s)->tmp.x25519 != NULL) {
1419 SSLerror(s, ERR_R_INTERNAL_ERROR);
1420 goto err;
1421 }
1422 if ((private_key = malloc(X25519_KEY_LENGTH)) == NULL)
1423 goto err;
1424 if ((public_key = malloc(X25519_KEY_LENGTH)) == NULL)
1425 goto err;
1426 X25519_keypair(public_key, private_key);
1427
1428 /* Serialize public key. */
1429 if ((curve_id = tls1_ec_nid2curve_id(nid)) == 0) {
1430 SSLerror(s, SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1431 goto err;
1432 }
1433
1434 if (!CBB_add_u8(cbb, NAMED_CURVE_TYPE))
1435 goto err;
1436 if (!CBB_add_u16(cbb, curve_id))
1437 goto err;
1438 if (!CBB_add_u8_length_prefixed(cbb, &ecpoint))
1439 goto err;
1440 if (!CBB_add_bytes(&ecpoint, public_key, X25519_KEY_LENGTH))
1441 goto err;
1442 if (!CBB_flush(cbb))
1443 goto err;
1444
1445 S3I(s)->tmp.x25519 = private_key;
1446 private_key = NULL;
1447 ret = 1;
1448
1449 err:
1450 free(public_key);
1451 freezero(private_key, X25519_KEY_LENGTH);
1452
1453 return (ret);
1454 }
1455
1456 static int
ssl3_send_server_kex_ecdhe(SSL * s,CBB * cbb)1457 ssl3_send_server_kex_ecdhe(SSL *s, CBB *cbb)
1458 {
1459 int nid;
1460
1461 nid = tls1_get_shared_curve(s);
1462
1463 if (nid == NID_X25519)
1464 return ssl3_send_server_kex_ecdhe_ecx(s, nid, cbb);
1465
1466 return ssl3_send_server_kex_ecdhe_ecp(s, nid, cbb);
1467 }
1468
1469 int
ssl3_send_server_key_exchange(SSL * s)1470 ssl3_send_server_key_exchange(SSL *s)
1471 {
1472 CBB cbb, cbb_params, cbb_signature, server_kex;
1473 const struct ssl_sigalg *sigalg = NULL;
1474 unsigned char *signature = NULL;
1475 size_t signature_len = 0;
1476 unsigned char *params = NULL;
1477 size_t params_len;
1478 const EVP_MD *md = NULL;
1479 unsigned long type;
1480 EVP_MD_CTX md_ctx;
1481 EVP_PKEY_CTX *pctx;
1482 EVP_PKEY *pkey;
1483 int al;
1484
1485 memset(&cbb, 0, sizeof(cbb));
1486 memset(&cbb_params, 0, sizeof(cbb_params));
1487
1488 EVP_MD_CTX_init(&md_ctx);
1489
1490 if (S3I(s)->hs.state == SSL3_ST_SW_KEY_EXCH_A) {
1491
1492 if (!ssl3_handshake_msg_start(s, &cbb, &server_kex,
1493 SSL3_MT_SERVER_KEY_EXCHANGE))
1494 goto err;
1495
1496 if (!CBB_init(&cbb_params, 0))
1497 goto err;
1498
1499 type = S3I(s)->hs.new_cipher->algorithm_mkey;
1500 if (type & SSL_kDHE) {
1501 if (ssl3_send_server_kex_dhe(s, &cbb_params) != 1)
1502 goto err;
1503 } else if (type & SSL_kECDHE) {
1504 if (ssl3_send_server_kex_ecdhe(s, &cbb_params) != 1)
1505 goto err;
1506 } else {
1507 al = SSL_AD_HANDSHAKE_FAILURE;
1508 SSLerror(s, SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1509 goto f_err;
1510 }
1511
1512 if (!CBB_finish(&cbb_params, ¶ms, ¶ms_len))
1513 goto err;
1514
1515 if (!CBB_add_bytes(&server_kex, params, params_len))
1516 goto err;
1517
1518 /* Add signature unless anonymous. */
1519 if (!(S3I(s)->hs.new_cipher->algorithm_auth & SSL_aNULL)) {
1520 if ((pkey = ssl_get_sign_pkey(s, S3I(s)->hs.new_cipher,
1521 &md, &sigalg)) == NULL) {
1522 al = SSL_AD_DECODE_ERROR;
1523 goto f_err;
1524 }
1525
1526 /* Send signature algorithm. */
1527 if (SSL_USE_SIGALGS(s)) {
1528 if (!CBB_add_u16(&server_kex, sigalg->value)) {
1529 al = SSL_AD_INTERNAL_ERROR;
1530 SSLerror(s, ERR_R_INTERNAL_ERROR);
1531 goto f_err;
1532 }
1533 }
1534
1535 if (!EVP_DigestSignInit(&md_ctx, &pctx, md, NULL, pkey)) {
1536 SSLerror(s, ERR_R_EVP_LIB);
1537 goto err;
1538 }
1539 if ((sigalg->flags & SIGALG_FLAG_RSA_PSS) &&
1540 (!EVP_PKEY_CTX_set_rsa_padding(pctx,
1541 RSA_PKCS1_PSS_PADDING) ||
1542 !EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx, -1))) {
1543 SSLerror(s, ERR_R_EVP_LIB);
1544 goto err;
1545 }
1546 if (!EVP_DigestSignUpdate(&md_ctx, s->s3->client_random,
1547 SSL3_RANDOM_SIZE)) {
1548 SSLerror(s, ERR_R_EVP_LIB);
1549 goto err;
1550 }
1551 if (!EVP_DigestSignUpdate(&md_ctx, s->s3->server_random,
1552 SSL3_RANDOM_SIZE)) {
1553 SSLerror(s, ERR_R_EVP_LIB);
1554 goto err;
1555 }
1556 if (!EVP_DigestSignUpdate(&md_ctx, params, params_len)) {
1557 SSLerror(s, ERR_R_EVP_LIB);
1558 goto err;
1559 }
1560 if (!EVP_DigestSignFinal(&md_ctx, NULL, &signature_len) ||
1561 !signature_len) {
1562 SSLerror(s, ERR_R_EVP_LIB);
1563 goto err;
1564 }
1565 if ((signature = calloc(1, signature_len)) == NULL) {
1566 SSLerror(s, ERR_R_MALLOC_FAILURE);
1567 goto err;
1568 }
1569 if (!EVP_DigestSignFinal(&md_ctx, signature, &signature_len)) {
1570 SSLerror(s, ERR_R_EVP_LIB);
1571 goto err;
1572 }
1573
1574 if (!CBB_add_u16_length_prefixed(&server_kex,
1575 &cbb_signature))
1576 goto err;
1577 if (!CBB_add_bytes(&cbb_signature, signature,
1578 signature_len))
1579 goto err;
1580 }
1581
1582 if (!ssl3_handshake_msg_finish(s, &cbb))
1583 goto err;
1584
1585 S3I(s)->hs.state = SSL3_ST_SW_KEY_EXCH_B;
1586 }
1587
1588 EVP_MD_CTX_cleanup(&md_ctx);
1589 free(params);
1590 free(signature);
1591
1592 return (ssl3_handshake_write(s));
1593
1594 f_err:
1595 ssl3_send_alert(s, SSL3_AL_FATAL, al);
1596 err:
1597 CBB_cleanup(&cbb_params);
1598 CBB_cleanup(&cbb);
1599 EVP_MD_CTX_cleanup(&md_ctx);
1600 free(params);
1601 free(signature);
1602
1603 return (-1);
1604 }
1605
1606 int
ssl3_send_certificate_request(SSL * s)1607 ssl3_send_certificate_request(SSL *s)
1608 {
1609 CBB cbb, cert_request, cert_types, sigalgs, cert_auth, dn;
1610 STACK_OF(X509_NAME) *sk = NULL;
1611 X509_NAME *name;
1612 int i;
1613
1614 /*
1615 * Certificate Request - RFC 5246 section 7.4.4.
1616 */
1617
1618 memset(&cbb, 0, sizeof(cbb));
1619
1620 if (S3I(s)->hs.state == SSL3_ST_SW_CERT_REQ_A) {
1621 if (!ssl3_handshake_msg_start(s, &cbb, &cert_request,
1622 SSL3_MT_CERTIFICATE_REQUEST))
1623 goto err;
1624
1625 if (!CBB_add_u8_length_prefixed(&cert_request, &cert_types))
1626 goto err;
1627 if (!ssl3_get_req_cert_types(s, &cert_types))
1628 goto err;
1629
1630 if (SSL_USE_SIGALGS(s)) {
1631 if (!CBB_add_u16_length_prefixed(&cert_request, &sigalgs))
1632 goto err;
1633 if (!ssl_sigalgs_build(&sigalgs, tls12_sigalgs, tls12_sigalgs_len))
1634 goto err;
1635 }
1636
1637 if (!CBB_add_u16_length_prefixed(&cert_request, &cert_auth))
1638 goto err;
1639
1640 sk = SSL_get_client_CA_list(s);
1641 for (i = 0; i < sk_X509_NAME_num(sk); i++) {
1642 unsigned char *name_data;
1643 size_t name_len;
1644
1645 name = sk_X509_NAME_value(sk, i);
1646 name_len = i2d_X509_NAME(name, NULL);
1647
1648 if (!CBB_add_u16_length_prefixed(&cert_auth, &dn))
1649 goto err;
1650 if (!CBB_add_space(&dn, &name_data, name_len))
1651 goto err;
1652 if (i2d_X509_NAME(name, &name_data) != name_len)
1653 goto err;
1654 }
1655
1656 if (!ssl3_handshake_msg_finish(s, &cbb))
1657 goto err;
1658
1659 S3I(s)->hs.state = SSL3_ST_SW_CERT_REQ_B;
1660 }
1661
1662 /* SSL3_ST_SW_CERT_REQ_B */
1663 return (ssl3_handshake_write(s));
1664
1665 err:
1666 CBB_cleanup(&cbb);
1667
1668 return (-1);
1669 }
1670
1671 static int
ssl3_get_client_kex_rsa(SSL * s,CBS * cbs)1672 ssl3_get_client_kex_rsa(SSL *s, CBS *cbs)
1673 {
1674 unsigned char fakekey[SSL_MAX_MASTER_KEY_LENGTH];
1675 unsigned char *pms = NULL;
1676 unsigned char *p;
1677 size_t pms_len = 0;
1678 EVP_PKEY *pkey = NULL;
1679 RSA *rsa = NULL;
1680 CBS enc_pms;
1681 int decrypt_len;
1682 int al = -1;
1683
1684 arc4random_buf(fakekey, sizeof(fakekey));
1685 fakekey[0] = s->client_version >> 8;
1686 fakekey[1] = s->client_version & 0xff;
1687
1688 pkey = s->cert->pkeys[SSL_PKEY_RSA].privatekey;
1689 if ((pkey == NULL) || (pkey->type != EVP_PKEY_RSA) ||
1690 (pkey->pkey.rsa == NULL)) {
1691 al = SSL_AD_HANDSHAKE_FAILURE;
1692 SSLerror(s, SSL_R_MISSING_RSA_CERTIFICATE);
1693 goto f_err;
1694 }
1695 rsa = pkey->pkey.rsa;
1696
1697 pms_len = RSA_size(rsa);
1698 if (pms_len < SSL_MAX_MASTER_KEY_LENGTH)
1699 goto err;
1700 if ((pms = malloc(pms_len)) == NULL)
1701 goto err;
1702 p = pms;
1703
1704 if (!CBS_get_u16_length_prefixed(cbs, &enc_pms))
1705 goto truncated;
1706 if (CBS_len(cbs) != 0 || CBS_len(&enc_pms) != RSA_size(rsa)) {
1707 SSLerror(s, SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
1708 goto err;
1709 }
1710
1711 decrypt_len = RSA_private_decrypt(CBS_len(&enc_pms), CBS_data(&enc_pms),
1712 pms, rsa, RSA_PKCS1_PADDING);
1713
1714 ERR_clear_error();
1715
1716 if (decrypt_len != SSL_MAX_MASTER_KEY_LENGTH) {
1717 al = SSL_AD_DECODE_ERROR;
1718 /* SSLerror(s, SSL_R_BAD_RSA_DECRYPT); */
1719 }
1720
1721 if ((al == -1) && !((pms[0] == (s->client_version >> 8)) &&
1722 (pms[1] == (s->client_version & 0xff)))) {
1723 /*
1724 * The premaster secret must contain the same version number
1725 * as the ClientHello to detect version rollback attacks
1726 * (strangely, the protocol does not offer such protection for
1727 * DH ciphersuites).
1728 *
1729 * The Klima-Pokorny-Rosa extension of Bleichenbacher's attack
1730 * (http://eprint.iacr.org/2003/052/) exploits the version
1731 * number check as a "bad version oracle" -- an alert would
1732 * reveal that the plaintext corresponding to some ciphertext
1733 * made up by the adversary is properly formatted except that
1734 * the version number is wrong. To avoid such attacks, we should
1735 * treat this just like any other decryption error.
1736 */
1737 al = SSL_AD_DECODE_ERROR;
1738 /* SSLerror(s, SSL_R_BAD_PROTOCOL_VERSION_NUMBER); */
1739 }
1740
1741 if (al != -1) {
1742 /*
1743 * Some decryption failure -- use random value instead
1744 * as countermeasure against Bleichenbacher's attack
1745 * on PKCS #1 v1.5 RSA padding (see RFC 2246,
1746 * section 7.4.7.1).
1747 */
1748 p = fakekey;
1749 }
1750
1751 s->session->master_key_length =
1752 tls1_generate_master_secret(s,
1753 s->session->master_key, p, SSL_MAX_MASTER_KEY_LENGTH);
1754
1755 freezero(pms, pms_len);
1756
1757 return (1);
1758
1759 truncated:
1760 al = SSL_AD_DECODE_ERROR;
1761 SSLerror(s, SSL_R_BAD_PACKET_LENGTH);
1762 f_err:
1763 ssl3_send_alert(s, SSL3_AL_FATAL, al);
1764 err:
1765 freezero(pms, pms_len);
1766
1767 return (-1);
1768 }
1769
1770 static int
ssl3_get_client_kex_dhe(SSL * s,CBS * cbs)1771 ssl3_get_client_kex_dhe(SSL *s, CBS *cbs)
1772 {
1773 int key_size = 0;
1774 int key_is_invalid, key_len, al;
1775 unsigned char *key = NULL;
1776 BIGNUM *bn = NULL;
1777 CBS dh_Yc;
1778 DH *dh;
1779
1780 if (!CBS_get_u16_length_prefixed(cbs, &dh_Yc))
1781 goto truncated;
1782 if (CBS_len(cbs) != 0)
1783 goto truncated;
1784
1785 if (S3I(s)->tmp.dh == NULL) {
1786 al = SSL_AD_HANDSHAKE_FAILURE;
1787 SSLerror(s, SSL_R_MISSING_TMP_DH_KEY);
1788 goto f_err;
1789 }
1790 dh = S3I(s)->tmp.dh;
1791
1792 if ((bn = BN_bin2bn(CBS_data(&dh_Yc), CBS_len(&dh_Yc), NULL)) == NULL) {
1793 SSLerror(s, SSL_R_BN_LIB);
1794 goto err;
1795 }
1796
1797 if ((key_size = DH_size(dh)) <= 0) {
1798 SSLerror(s, ERR_R_DH_LIB);
1799 goto err;
1800 }
1801 if ((key = malloc(key_size)) == NULL) {
1802 SSLerror(s, ERR_R_MALLOC_FAILURE);
1803 goto err;
1804 }
1805 if (!DH_check_pub_key(dh, bn, &key_is_invalid)) {
1806 al = SSL_AD_INTERNAL_ERROR;
1807 SSLerror(s, ERR_R_DH_LIB);
1808 goto f_err;
1809 }
1810 if (key_is_invalid) {
1811 al = SSL_AD_ILLEGAL_PARAMETER;
1812 SSLerror(s, ERR_R_DH_LIB);
1813 goto f_err;
1814 }
1815 if ((key_len = DH_compute_key(key, bn, dh)) <= 0) {
1816 al = SSL_AD_INTERNAL_ERROR;
1817 SSLerror(s, ERR_R_DH_LIB);
1818 goto f_err;
1819 }
1820
1821 s->session->master_key_length = tls1_generate_master_secret(s,
1822 s->session->master_key, key, key_len);
1823
1824 DH_free(S3I(s)->tmp.dh);
1825 S3I(s)->tmp.dh = NULL;
1826
1827 freezero(key, key_size);
1828 BN_clear_free(bn);
1829
1830 return (1);
1831
1832 truncated:
1833 al = SSL_AD_DECODE_ERROR;
1834 SSLerror(s, SSL_R_BAD_PACKET_LENGTH);
1835 f_err:
1836 ssl3_send_alert(s, SSL3_AL_FATAL, al);
1837 err:
1838 freezero(key, key_size);
1839 BN_clear_free(bn);
1840
1841 return (-1);
1842 }
1843
1844 static int
ssl3_get_client_kex_ecdhe_ecp(SSL * s,CBS * cbs)1845 ssl3_get_client_kex_ecdhe_ecp(SSL *s, CBS *cbs)
1846 {
1847 uint8_t *key = NULL;
1848 size_t key_len = 0;
1849 EC_KEY *ecdh_peer = NULL;
1850 EC_KEY *ecdh;
1851 CBS public;
1852 int ret = -1;
1853
1854 /*
1855 * Use the ephemeral values we saved when generating the
1856 * ServerKeyExchange message.
1857 */
1858 if ((ecdh = S3I(s)->tmp.ecdh) == NULL) {
1859 SSLerror(s, ERR_R_INTERNAL_ERROR);
1860 goto err;
1861 }
1862
1863 /*
1864 * Get client's public key from encoded point in the ClientKeyExchange
1865 * message.
1866 */
1867 if (!CBS_get_u8_length_prefixed(cbs, &public))
1868 goto err;
1869 if (CBS_len(cbs) != 0)
1870 goto err;
1871
1872 if ((ecdh_peer = EC_KEY_new()) == NULL)
1873 goto err;
1874
1875 if (!ssl_kex_peer_public_ecdhe_ecp(ecdh_peer, S3I(s)->tmp.ecdh_nid,
1876 &public))
1877 goto err;
1878
1879 /* Derive the shared secret and compute master secret. */
1880 if (!ssl_kex_derive_ecdhe_ecp(ecdh, ecdh_peer, &key, &key_len))
1881 goto err;
1882 s->session->master_key_length = tls1_generate_master_secret(s,
1883 s->session->master_key, key, key_len);
1884
1885 EC_KEY_free(S3I(s)->tmp.ecdh);
1886 S3I(s)->tmp.ecdh = NULL;
1887 S3I(s)->tmp.ecdh_nid = NID_undef;
1888
1889 ret = 1;
1890
1891 err:
1892 freezero(key, key_len);
1893 EC_KEY_free(ecdh_peer);
1894
1895 return (ret);
1896 }
1897
1898 static int
ssl3_get_client_kex_ecdhe_ecx(SSL * s,CBS * cbs)1899 ssl3_get_client_kex_ecdhe_ecx(SSL *s, CBS *cbs)
1900 {
1901 uint8_t *shared_key = NULL;
1902 CBS ecpoint;
1903 int ret = -1;
1904
1905 if (!CBS_get_u8_length_prefixed(cbs, &ecpoint))
1906 goto err;
1907 if (CBS_len(cbs) != 0)
1908 goto err;
1909 if (CBS_len(&ecpoint) != X25519_KEY_LENGTH)
1910 goto err;
1911
1912 if ((shared_key = malloc(X25519_KEY_LENGTH)) == NULL)
1913 goto err;
1914 if (!X25519(shared_key, S3I(s)->tmp.x25519, CBS_data(&ecpoint)))
1915 goto err;
1916
1917 freezero(S3I(s)->tmp.x25519, X25519_KEY_LENGTH);
1918 S3I(s)->tmp.x25519 = NULL;
1919
1920 s->session->master_key_length =
1921 tls1_generate_master_secret(
1922 s, s->session->master_key, shared_key, X25519_KEY_LENGTH);
1923
1924 ret = 1;
1925
1926 err:
1927 freezero(shared_key, X25519_KEY_LENGTH);
1928
1929 return (ret);
1930 }
1931
1932 static int
ssl3_get_client_kex_ecdhe(SSL * s,CBS * cbs)1933 ssl3_get_client_kex_ecdhe(SSL *s, CBS *cbs)
1934 {
1935 if (S3I(s)->tmp.x25519 != NULL)
1936 return ssl3_get_client_kex_ecdhe_ecx(s, cbs);
1937
1938 return ssl3_get_client_kex_ecdhe_ecp(s, cbs);
1939 }
1940
1941 static int
ssl3_get_client_kex_gost(SSL * s,CBS * cbs)1942 ssl3_get_client_kex_gost(SSL *s, CBS *cbs)
1943 {
1944 EVP_PKEY_CTX *pkey_ctx;
1945 EVP_PKEY *client_pub_pkey = NULL, *pk = NULL;
1946 unsigned char premaster_secret[32];
1947 unsigned long alg_a;
1948 size_t outlen = 32;
1949 CBS gostblob;
1950 int al;
1951 int ret = 0;
1952
1953 /* Get our certificate private key*/
1954 alg_a = S3I(s)->hs.new_cipher->algorithm_auth;
1955 if (alg_a & SSL_aGOST01)
1956 pk = s->cert->pkeys[SSL_PKEY_GOST01].privatekey;
1957
1958 if ((pkey_ctx = EVP_PKEY_CTX_new(pk, NULL)) == NULL)
1959 goto err;
1960 if (EVP_PKEY_decrypt_init(pkey_ctx) <= 0)
1961 goto gerr;
1962
1963 /*
1964 * If client certificate is present and is of the same type,
1965 * maybe use it for key exchange.
1966 * Don't mind errors from EVP_PKEY_derive_set_peer, because
1967 * it is completely valid to use a client certificate for
1968 * authorization only.
1969 */
1970 if ((client_pub_pkey = X509_get_pubkey(s->session->peer)) != NULL) {
1971 if (EVP_PKEY_derive_set_peer(pkey_ctx,
1972 client_pub_pkey) <= 0)
1973 ERR_clear_error();
1974 }
1975
1976 /* Decrypt session key */
1977 if (!CBS_get_asn1(cbs, &gostblob, CBS_ASN1_SEQUENCE))
1978 goto truncated;
1979 if (CBS_len(cbs) != 0)
1980 goto truncated;
1981 if (EVP_PKEY_decrypt(pkey_ctx, premaster_secret, &outlen,
1982 CBS_data(&gostblob), CBS_len(&gostblob)) <= 0) {
1983 SSLerror(s, SSL_R_DECRYPTION_FAILED);
1984 goto gerr;
1985 }
1986
1987 /* Generate master secret */
1988 s->session->master_key_length =
1989 tls1_generate_master_secret(
1990 s, s->session->master_key, premaster_secret, 32);
1991
1992 /* Check if pubkey from client certificate was used */
1993 if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1,
1994 EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0)
1995 ret = 2;
1996 else
1997 ret = 1;
1998 gerr:
1999 EVP_PKEY_free(client_pub_pkey);
2000 EVP_PKEY_CTX_free(pkey_ctx);
2001 if (ret)
2002 return (ret);
2003 else
2004 goto err;
2005
2006 truncated:
2007 al = SSL_AD_DECODE_ERROR;
2008 SSLerror(s, SSL_R_BAD_PACKET_LENGTH);
2009 ssl3_send_alert(s, SSL3_AL_FATAL, al);
2010 err:
2011 return (-1);
2012 }
2013
2014 int
ssl3_get_client_key_exchange(SSL * s)2015 ssl3_get_client_key_exchange(SSL *s)
2016 {
2017 unsigned long alg_k;
2018 int al, ok;
2019 CBS cbs;
2020 long n;
2021
2022 /* 2048 maxlen is a guess. How long a key does that permit? */
2023 n = ssl3_get_message(s, SSL3_ST_SR_KEY_EXCH_A,
2024 SSL3_ST_SR_KEY_EXCH_B, SSL3_MT_CLIENT_KEY_EXCHANGE, 2048, &ok);
2025 if (!ok)
2026 return ((int)n);
2027
2028 if (n < 0)
2029 goto err;
2030
2031 CBS_init(&cbs, s->internal->init_msg, n);
2032
2033 alg_k = S3I(s)->hs.new_cipher->algorithm_mkey;
2034
2035 if (alg_k & SSL_kRSA) {
2036 if (ssl3_get_client_kex_rsa(s, &cbs) != 1)
2037 goto err;
2038 } else if (alg_k & SSL_kDHE) {
2039 if (ssl3_get_client_kex_dhe(s, &cbs) != 1)
2040 goto err;
2041 } else if (alg_k & SSL_kECDHE) {
2042 if (ssl3_get_client_kex_ecdhe(s, &cbs) != 1)
2043 goto err;
2044 } else if (alg_k & SSL_kGOST) {
2045 if (ssl3_get_client_kex_gost(s, &cbs) != 1)
2046 goto err;
2047 } else {
2048 al = SSL_AD_HANDSHAKE_FAILURE;
2049 SSLerror(s, SSL_R_UNKNOWN_CIPHER_TYPE);
2050 goto f_err;
2051 }
2052
2053 if (CBS_len(&cbs) != 0) {
2054 al = SSL_AD_DECODE_ERROR;
2055 SSLerror(s, SSL_R_BAD_PACKET_LENGTH);
2056 goto f_err;
2057 }
2058
2059 return (1);
2060
2061 f_err:
2062 ssl3_send_alert(s, SSL3_AL_FATAL, al);
2063 err:
2064 return (-1);
2065 }
2066
2067 int
ssl3_get_cert_verify(SSL * s)2068 ssl3_get_cert_verify(SSL *s)
2069 {
2070 CBS cbs, signature;
2071 const struct ssl_sigalg *sigalg = NULL;
2072 const EVP_MD *md = NULL;
2073 EVP_PKEY *pkey = NULL;
2074 X509 *peer = NULL;
2075 EVP_MD_CTX mctx;
2076 int al, ok, verify;
2077 const unsigned char *hdata;
2078 size_t hdatalen;
2079 int type = 0;
2080 int ret = 0;
2081 long n;
2082
2083 EVP_MD_CTX_init(&mctx);
2084
2085 n = ssl3_get_message(s, SSL3_ST_SR_CERT_VRFY_A,
2086 SSL3_ST_SR_CERT_VRFY_B, -1, SSL3_RT_MAX_PLAIN_LENGTH, &ok);
2087 if (!ok)
2088 return ((int)n);
2089
2090 if (n < 0)
2091 goto err;
2092
2093 CBS_init(&cbs, s->internal->init_msg, n);
2094
2095 if (s->session->peer != NULL) {
2096 peer = s->session->peer;
2097 pkey = X509_get_pubkey(peer);
2098 type = X509_certificate_type(peer, pkey);
2099 }
2100
2101 if (S3I(s)->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY) {
2102 S3I(s)->tmp.reuse_message = 1;
2103 if (peer != NULL) {
2104 al = SSL_AD_UNEXPECTED_MESSAGE;
2105 SSLerror(s, SSL_R_MISSING_VERIFY_MESSAGE);
2106 goto f_err;
2107 }
2108 ret = 1;
2109 goto end;
2110 }
2111
2112 if (peer == NULL) {
2113 SSLerror(s, SSL_R_NO_CLIENT_CERT_RECEIVED);
2114 al = SSL_AD_UNEXPECTED_MESSAGE;
2115 goto f_err;
2116 }
2117
2118 if (!(type & EVP_PKT_SIGN)) {
2119 SSLerror(s, SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
2120 al = SSL_AD_ILLEGAL_PARAMETER;
2121 goto f_err;
2122 }
2123
2124 if (S3I(s)->change_cipher_spec) {
2125 SSLerror(s, SSL_R_CCS_RECEIVED_EARLY);
2126 al = SSL_AD_UNEXPECTED_MESSAGE;
2127 goto f_err;
2128 }
2129
2130 if (!SSL_USE_SIGALGS(s)) {
2131 if (!CBS_get_u16_length_prefixed(&cbs, &signature))
2132 goto err;
2133 if (CBS_len(&signature) > EVP_PKEY_size(pkey)) {
2134 SSLerror(s, SSL_R_WRONG_SIGNATURE_SIZE);
2135 al = SSL_AD_DECODE_ERROR;
2136 goto f_err;
2137 }
2138 if (CBS_len(&cbs) != 0) {
2139 al = SSL_AD_DECODE_ERROR;
2140 SSLerror(s, SSL_R_EXTRA_DATA_IN_MESSAGE);
2141 goto f_err;
2142 }
2143 }
2144
2145 if (SSL_USE_SIGALGS(s)) {
2146 EVP_PKEY_CTX *pctx;
2147 uint16_t sigalg_value;
2148
2149 if (!CBS_get_u16(&cbs, &sigalg_value))
2150 goto truncated;
2151 if ((sigalg = ssl_sigalg(sigalg_value, tls12_sigalgs,
2152 tls12_sigalgs_len)) == NULL ||
2153 (md = sigalg->md()) == NULL) {
2154 SSLerror(s, SSL_R_UNKNOWN_DIGEST);
2155 al = SSL_AD_DECODE_ERROR;
2156 goto f_err;
2157 }
2158 if (!ssl_sigalg_pkey_ok(sigalg, pkey, 0)) {
2159 SSLerror(s, SSL_R_WRONG_SIGNATURE_TYPE);
2160 al = SSL_AD_DECODE_ERROR;
2161 goto f_err;
2162 }
2163
2164 if (!CBS_get_u16_length_prefixed(&cbs, &signature))
2165 goto err;
2166 if (CBS_len(&signature) > EVP_PKEY_size(pkey)) {
2167 SSLerror(s, SSL_R_WRONG_SIGNATURE_SIZE);
2168 al = SSL_AD_DECODE_ERROR;
2169 goto f_err;
2170 }
2171 if (CBS_len(&cbs) != 0) {
2172 al = SSL_AD_DECODE_ERROR;
2173 SSLerror(s, SSL_R_EXTRA_DATA_IN_MESSAGE);
2174 goto f_err;
2175 }
2176
2177 if (!tls1_transcript_data(s, &hdata, &hdatalen)) {
2178 SSLerror(s, ERR_R_INTERNAL_ERROR);
2179 al = SSL_AD_INTERNAL_ERROR;
2180 goto f_err;
2181 }
2182 if (!EVP_DigestVerifyInit(&mctx, &pctx, md, NULL, pkey)) {
2183 SSLerror(s, ERR_R_EVP_LIB);
2184 al = SSL_AD_INTERNAL_ERROR;
2185 goto f_err;
2186 }
2187 if ((sigalg->flags & SIGALG_FLAG_RSA_PSS) &&
2188 (!EVP_PKEY_CTX_set_rsa_padding
2189 (pctx, RSA_PKCS1_PSS_PADDING) ||
2190 !EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx, -1))) {
2191 al = SSL_AD_INTERNAL_ERROR;
2192 goto f_err;
2193 }
2194 if (sigalg->key_type == EVP_PKEY_GOSTR01 &&
2195 EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_VERIFY,
2196 EVP_PKEY_CTRL_GOST_SIG_FORMAT, GOST_SIG_FORMAT_RS_LE,
2197 NULL) <= 0) {
2198 al = SSL_AD_INTERNAL_ERROR;
2199 goto f_err;
2200 }
2201 if (!EVP_DigestVerifyUpdate(&mctx, hdata, hdatalen)) {
2202 SSLerror(s, ERR_R_EVP_LIB);
2203 al = SSL_AD_INTERNAL_ERROR;
2204 goto f_err;
2205 }
2206 if (EVP_DigestVerifyFinal(&mctx, CBS_data(&signature),
2207 CBS_len(&signature)) <= 0) {
2208 al = SSL_AD_DECRYPT_ERROR;
2209 SSLerror(s, SSL_R_BAD_SIGNATURE);
2210 goto f_err;
2211 }
2212 } else if (pkey->type == EVP_PKEY_RSA) {
2213 verify = RSA_verify(NID_md5_sha1, S3I(s)->tmp.cert_verify_md,
2214 MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH, CBS_data(&signature),
2215 CBS_len(&signature), pkey->pkey.rsa);
2216 if (verify < 0) {
2217 al = SSL_AD_DECRYPT_ERROR;
2218 SSLerror(s, SSL_R_BAD_RSA_DECRYPT);
2219 goto f_err;
2220 }
2221 if (verify == 0) {
2222 al = SSL_AD_DECRYPT_ERROR;
2223 SSLerror(s, SSL_R_BAD_RSA_SIGNATURE);
2224 goto f_err;
2225 }
2226 } else if (pkey->type == EVP_PKEY_EC) {
2227 verify = ECDSA_verify(pkey->save_type,
2228 &(S3I(s)->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
2229 SHA_DIGEST_LENGTH, CBS_data(&signature),
2230 CBS_len(&signature), pkey->pkey.ec);
2231 if (verify <= 0) {
2232 al = SSL_AD_DECRYPT_ERROR;
2233 SSLerror(s, SSL_R_BAD_ECDSA_SIGNATURE);
2234 goto f_err;
2235 }
2236 #ifndef OPENSSL_NO_GOST
2237 } else if (pkey->type == NID_id_GostR3410_94 ||
2238 pkey->type == NID_id_GostR3410_2001) {
2239 unsigned char sigbuf[128];
2240 unsigned int siglen = sizeof(sigbuf);
2241 EVP_PKEY_CTX *pctx;
2242 int nid;
2243
2244 if (!tls1_transcript_data(s, &hdata, &hdatalen)) {
2245 SSLerror(s, ERR_R_INTERNAL_ERROR);
2246 al = SSL_AD_INTERNAL_ERROR;
2247 goto f_err;
2248 }
2249 if (!EVP_PKEY_get_default_digest_nid(pkey, &nid) ||
2250 !(md = EVP_get_digestbynid(nid))) {
2251 SSLerror(s, ERR_R_EVP_LIB);
2252 al = SSL_AD_INTERNAL_ERROR;
2253 goto f_err;
2254 }
2255 if ((pctx = EVP_PKEY_CTX_new(pkey, NULL)) == NULL) {
2256 SSLerror(s, ERR_R_EVP_LIB);
2257 al = SSL_AD_INTERNAL_ERROR;
2258 goto f_err;
2259 }
2260 if (!EVP_DigestInit_ex(&mctx, md, NULL) ||
2261 !EVP_DigestUpdate(&mctx, hdata, hdatalen) ||
2262 !EVP_DigestFinal(&mctx, sigbuf, &siglen) ||
2263 (EVP_PKEY_verify_init(pctx) <= 0) ||
2264 (EVP_PKEY_CTX_set_signature_md(pctx, md) <= 0) ||
2265 (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_VERIFY,
2266 EVP_PKEY_CTRL_GOST_SIG_FORMAT,
2267 GOST_SIG_FORMAT_RS_LE, NULL) <= 0)) {
2268 SSLerror(s, ERR_R_EVP_LIB);
2269 al = SSL_AD_INTERNAL_ERROR;
2270 EVP_PKEY_CTX_free(pctx);
2271 goto f_err;
2272 }
2273 if (EVP_PKEY_verify(pctx, CBS_data(&signature),
2274 CBS_len(&signature), sigbuf, siglen) <= 0) {
2275 al = SSL_AD_DECRYPT_ERROR;
2276 SSLerror(s, SSL_R_BAD_SIGNATURE);
2277 EVP_PKEY_CTX_free(pctx);
2278 goto f_err;
2279 }
2280
2281 EVP_PKEY_CTX_free(pctx);
2282 #endif
2283 } else {
2284 SSLerror(s, ERR_R_INTERNAL_ERROR);
2285 al = SSL_AD_UNSUPPORTED_CERTIFICATE;
2286 goto f_err;
2287 }
2288
2289 ret = 1;
2290 if (0) {
2291 truncated:
2292 al = SSL_AD_DECODE_ERROR;
2293 SSLerror(s, SSL_R_BAD_PACKET_LENGTH);
2294 f_err:
2295 ssl3_send_alert(s, SSL3_AL_FATAL, al);
2296 }
2297 end:
2298 tls1_transcript_free(s);
2299 err:
2300 EVP_MD_CTX_cleanup(&mctx);
2301 EVP_PKEY_free(pkey);
2302 return (ret);
2303 }
2304
2305 int
ssl3_get_client_certificate(SSL * s)2306 ssl3_get_client_certificate(SSL *s)
2307 {
2308 CBS cbs, client_certs;
2309 int i, ok, al, ret = -1;
2310 X509 *x = NULL;
2311 long n;
2312 const unsigned char *q;
2313 STACK_OF(X509) *sk = NULL;
2314
2315 n = ssl3_get_message(s, SSL3_ST_SR_CERT_A, SSL3_ST_SR_CERT_B,
2316 -1, s->internal->max_cert_list, &ok);
2317 if (!ok)
2318 return ((int)n);
2319
2320 if (S3I(s)->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE) {
2321 if ((s->verify_mode & SSL_VERIFY_PEER) &&
2322 (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) {
2323 SSLerror(s, SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
2324 al = SSL_AD_HANDSHAKE_FAILURE;
2325 goto f_err;
2326 }
2327 /*
2328 * If tls asked for a client cert,
2329 * the client must return a 0 list.
2330 */
2331 if (S3I(s)->tmp.cert_request) {
2332 SSLerror(s, SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST
2333 );
2334 al = SSL_AD_UNEXPECTED_MESSAGE;
2335 goto f_err;
2336 }
2337 S3I(s)->tmp.reuse_message = 1;
2338 return (1);
2339 }
2340
2341 if (S3I(s)->tmp.message_type != SSL3_MT_CERTIFICATE) {
2342 al = SSL_AD_UNEXPECTED_MESSAGE;
2343 SSLerror(s, SSL_R_WRONG_MESSAGE_TYPE);
2344 goto f_err;
2345 }
2346
2347 if (n < 0)
2348 goto truncated;
2349
2350 CBS_init(&cbs, s->internal->init_msg, n);
2351
2352 if ((sk = sk_X509_new_null()) == NULL) {
2353 SSLerror(s, ERR_R_MALLOC_FAILURE);
2354 goto err;
2355 }
2356
2357 if (!CBS_get_u24_length_prefixed(&cbs, &client_certs) ||
2358 CBS_len(&cbs) != 0)
2359 goto truncated;
2360
2361 while (CBS_len(&client_certs) > 0) {
2362 CBS cert;
2363
2364 if (!CBS_get_u24_length_prefixed(&client_certs, &cert)) {
2365 al = SSL_AD_DECODE_ERROR;
2366 SSLerror(s, SSL_R_CERT_LENGTH_MISMATCH);
2367 goto f_err;
2368 }
2369
2370 q = CBS_data(&cert);
2371 x = d2i_X509(NULL, &q, CBS_len(&cert));
2372 if (x == NULL) {
2373 SSLerror(s, ERR_R_ASN1_LIB);
2374 goto err;
2375 }
2376 if (q != CBS_data(&cert) + CBS_len(&cert)) {
2377 al = SSL_AD_DECODE_ERROR;
2378 SSLerror(s, SSL_R_CERT_LENGTH_MISMATCH);
2379 goto f_err;
2380 }
2381 if (!sk_X509_push(sk, x)) {
2382 SSLerror(s, ERR_R_MALLOC_FAILURE);
2383 goto err;
2384 }
2385 x = NULL;
2386 }
2387
2388 if (sk_X509_num(sk) <= 0) {
2389 /*
2390 * TLS does not mind 0 certs returned.
2391 * Fail for TLS only if we required a certificate.
2392 */
2393 if ((s->verify_mode & SSL_VERIFY_PEER) &&
2394 (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) {
2395 SSLerror(s, SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
2396 al = SSL_AD_HANDSHAKE_FAILURE;
2397 goto f_err;
2398 }
2399 /* No client certificate so free transcript. */
2400 tls1_transcript_free(s);
2401 } else {
2402 i = ssl_verify_cert_chain(s, sk);
2403 if (i <= 0) {
2404 al = ssl_verify_alarm_type(s->verify_result);
2405 SSLerror(s, SSL_R_NO_CERTIFICATE_RETURNED);
2406 goto f_err;
2407 }
2408 }
2409
2410 X509_free(s->session->peer);
2411 s->session->peer = sk_X509_shift(sk);
2412 s->session->verify_result = s->verify_result;
2413
2414 /*
2415 * With the current implementation, sess_cert will always be NULL
2416 * when we arrive here
2417 */
2418 if (SSI(s)->sess_cert == NULL) {
2419 SSI(s)->sess_cert = ssl_sess_cert_new();
2420 if (SSI(s)->sess_cert == NULL) {
2421 SSLerror(s, ERR_R_MALLOC_FAILURE);
2422 goto err;
2423 }
2424 }
2425 sk_X509_pop_free(SSI(s)->sess_cert->cert_chain, X509_free);
2426 SSI(s)->sess_cert->cert_chain = sk;
2427
2428 /*
2429 * Inconsistency alert: cert_chain does *not* include the
2430 * peer's own certificate, while we do include it in s3_clnt.c
2431 */
2432
2433 sk = NULL;
2434
2435 ret = 1;
2436 if (0) {
2437 truncated:
2438 al = SSL_AD_DECODE_ERROR;
2439 SSLerror(s, SSL_R_BAD_PACKET_LENGTH);
2440 f_err:
2441 ssl3_send_alert(s, SSL3_AL_FATAL, al);
2442 }
2443 err:
2444 X509_free(x);
2445 sk_X509_pop_free(sk, X509_free);
2446
2447 return (ret);
2448 }
2449
2450 int
ssl3_send_server_certificate(SSL * s)2451 ssl3_send_server_certificate(SSL *s)
2452 {
2453 CBB cbb, server_cert;
2454 CERT_PKEY *cpk;
2455
2456 /*
2457 * Server Certificate - RFC 5246, section 7.4.2.
2458 */
2459
2460 memset(&cbb, 0, sizeof(cbb));
2461
2462 if (S3I(s)->hs.state == SSL3_ST_SW_CERT_A) {
2463 if ((cpk = ssl_get_server_send_pkey(s)) == NULL) {
2464 SSLerror(s, ERR_R_INTERNAL_ERROR);
2465 return (0);
2466 }
2467
2468 if (!ssl3_handshake_msg_start(s, &cbb, &server_cert,
2469 SSL3_MT_CERTIFICATE))
2470 goto err;
2471 if (!ssl3_output_cert_chain(s, &server_cert, cpk))
2472 goto err;
2473 if (!ssl3_handshake_msg_finish(s, &cbb))
2474 goto err;
2475
2476 S3I(s)->hs.state = SSL3_ST_SW_CERT_B;
2477 }
2478
2479 /* SSL3_ST_SW_CERT_B */
2480 return (ssl3_handshake_write(s));
2481
2482 err:
2483 CBB_cleanup(&cbb);
2484
2485 return (0);
2486 }
2487
2488 /* send a new session ticket (not necessarily for a new session) */
2489 int
ssl3_send_newsession_ticket(SSL * s)2490 ssl3_send_newsession_ticket(SSL *s)
2491 {
2492 CBB cbb, session_ticket, ticket;
2493 SSL_CTX *tctx = s->initial_ctx;
2494 size_t enc_session_len, enc_session_max_len, hmac_len;
2495 size_t session_len = 0;
2496 unsigned char *enc_session = NULL, *session = NULL;
2497 unsigned char iv[EVP_MAX_IV_LENGTH];
2498 unsigned char key_name[16];
2499 unsigned char *hmac;
2500 unsigned int hlen;
2501 EVP_CIPHER_CTX ctx;
2502 HMAC_CTX hctx;
2503 int len;
2504
2505 /*
2506 * New Session Ticket - RFC 5077, section 3.3.
2507 */
2508
2509 EVP_CIPHER_CTX_init(&ctx);
2510 HMAC_CTX_init(&hctx);
2511
2512 memset(&cbb, 0, sizeof(cbb));
2513
2514 if (S3I(s)->hs.state == SSL3_ST_SW_SESSION_TICKET_A) {
2515 if (!ssl3_handshake_msg_start(s, &cbb, &session_ticket,
2516 SSL3_MT_NEWSESSION_TICKET))
2517 goto err;
2518
2519 if (!SSL_SESSION_ticket(s->session, &session, &session_len))
2520 goto err;
2521 if (session_len > 0xffff)
2522 goto err;
2523
2524 /*
2525 * Initialize HMAC and cipher contexts. If callback is present
2526 * it does all the work, otherwise use generated values from
2527 * parent context.
2528 */
2529 if (tctx->internal->tlsext_ticket_key_cb != NULL) {
2530 if (tctx->internal->tlsext_ticket_key_cb(s,
2531 key_name, iv, &ctx, &hctx, 1) < 0) {
2532 EVP_CIPHER_CTX_cleanup(&ctx);
2533 goto err;
2534 }
2535 } else {
2536 arc4random_buf(iv, 16);
2537 EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
2538 tctx->internal->tlsext_tick_aes_key, iv);
2539 HMAC_Init_ex(&hctx, tctx->internal->tlsext_tick_hmac_key,
2540 16, EVP_sha256(), NULL);
2541 memcpy(key_name, tctx->internal->tlsext_tick_key_name, 16);
2542 }
2543
2544 /* Encrypt the session state. */
2545 enc_session_max_len = session_len + EVP_MAX_BLOCK_LENGTH;
2546 if ((enc_session = calloc(1, enc_session_max_len)) == NULL)
2547 goto err;
2548 enc_session_len = 0;
2549 if (!EVP_EncryptUpdate(&ctx, enc_session, &len, session,
2550 session_len))
2551 goto err;
2552 enc_session_len += len;
2553 if (!EVP_EncryptFinal_ex(&ctx, enc_session + enc_session_len,
2554 &len))
2555 goto err;
2556 enc_session_len += len;
2557
2558 if (enc_session_len > enc_session_max_len)
2559 goto err;
2560
2561 /* Generate the HMAC. */
2562 if (!HMAC_Update(&hctx, key_name, sizeof(key_name)))
2563 goto err;
2564 if (!HMAC_Update(&hctx, iv, EVP_CIPHER_CTX_iv_length(&ctx)))
2565 goto err;
2566 if (!HMAC_Update(&hctx, enc_session, enc_session_len))
2567 goto err;
2568
2569 if ((hmac_len = HMAC_size(&hctx)) <= 0)
2570 goto err;
2571
2572 /*
2573 * Ticket lifetime hint (advisory only):
2574 * We leave this unspecified for resumed session
2575 * (for simplicity), and guess that tickets for new
2576 * sessions will live as long as their sessions.
2577 */
2578 if (!CBB_add_u32(&session_ticket,
2579 s->internal->hit ? 0 : s->session->timeout))
2580 goto err;
2581
2582 if (!CBB_add_u16_length_prefixed(&session_ticket, &ticket))
2583 goto err;
2584 if (!CBB_add_bytes(&ticket, key_name, sizeof(key_name)))
2585 goto err;
2586 if (!CBB_add_bytes(&ticket, iv, EVP_CIPHER_CTX_iv_length(&ctx)))
2587 goto err;
2588 if (!CBB_add_bytes(&ticket, enc_session, enc_session_len))
2589 goto err;
2590 if (!CBB_add_space(&ticket, &hmac, hmac_len))
2591 goto err;
2592
2593 if (!HMAC_Final(&hctx, hmac, &hlen))
2594 goto err;
2595 if (hlen != hmac_len)
2596 goto err;
2597
2598 if (!ssl3_handshake_msg_finish(s, &cbb))
2599 goto err;
2600
2601 S3I(s)->hs.state = SSL3_ST_SW_SESSION_TICKET_B;
2602 }
2603
2604 EVP_CIPHER_CTX_cleanup(&ctx);
2605 HMAC_CTX_cleanup(&hctx);
2606 freezero(session, session_len);
2607 free(enc_session);
2608
2609 /* SSL3_ST_SW_SESSION_TICKET_B */
2610 return (ssl3_handshake_write(s));
2611
2612 err:
2613 CBB_cleanup(&cbb);
2614 EVP_CIPHER_CTX_cleanup(&ctx);
2615 HMAC_CTX_cleanup(&hctx);
2616 freezero(session, session_len);
2617 free(enc_session);
2618
2619 return (-1);
2620 }
2621
2622 int
ssl3_send_cert_status(SSL * s)2623 ssl3_send_cert_status(SSL *s)
2624 {
2625 CBB cbb, certstatus, ocspresp;
2626
2627 memset(&cbb, 0, sizeof(cbb));
2628
2629 if (S3I(s)->hs.state == SSL3_ST_SW_CERT_STATUS_A) {
2630 if (!ssl3_handshake_msg_start(s, &cbb, &certstatus,
2631 SSL3_MT_CERTIFICATE_STATUS))
2632 goto err;
2633 if (!CBB_add_u8(&certstatus, s->tlsext_status_type))
2634 goto err;
2635 if (!CBB_add_u24_length_prefixed(&certstatus, &ocspresp))
2636 goto err;
2637 if (!CBB_add_bytes(&ocspresp, s->internal->tlsext_ocsp_resp,
2638 s->internal->tlsext_ocsp_resp_len))
2639 goto err;
2640 if (!ssl3_handshake_msg_finish(s, &cbb))
2641 goto err;
2642
2643 S3I(s)->hs.state = SSL3_ST_SW_CERT_STATUS_B;
2644 }
2645
2646 /* SSL3_ST_SW_CERT_STATUS_B */
2647 return (ssl3_handshake_write(s));
2648
2649 err:
2650 CBB_cleanup(&cbb);
2651
2652 return (-1);
2653 }
2654