1/*
2 * Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved.
3 * Copyright (c) 2002, Oracle and/or its affiliates. All rights reserved
4 * Copyright 2005 Nokia. All rights reserved.
5 *
6 * Licensed under the Apache License 2.0 (the "License"). You may not use
7 * this file except in compliance with the License. You can obtain a copy
8 * in the file LICENSE in the source distribution or at
9 * https://www.openssl.org/source/license.html
10 */
11
12#include <stdio.h>
13#include "../ssl_local.h"
14#include "statem_local.h"
15#include "internal/constant_time.h"
16#include "internal/cryptlib.h"
17#include <openssl/buffer.h>
18#include <openssl/rand.h>
19#include <openssl/objects.h>
20#include <openssl/evp.h>
21#include <openssl/hmac.h>
22#include <openssl/x509.h>
23#include <openssl/dh.h>
24#include <openssl/bn.h>
25#include <openssl/md5.h>
26#include <openssl/trace.h>
27#include <openssl/core_names.h>
28#include <openssl/asn1t.h>
29
30#define TICKET_NONCE_SIZE 8
31
32typedef struct {
33 ASN1_TYPE *kxBlob;
34 ASN1_TYPE *opaqueBlob;
35} GOST_KX_MESSAGE;
36
37DECLARE_ASN1_FUNCTIONS(GOST_KX_MESSAGE)
38
39ASN1_SEQUENCE(GOST_KX_MESSAGE) = {
40 ASN1_SIMPLE(GOST_KX_MESSAGE, kxBlob, ASN1_ANY),
41 ASN1_OPT(GOST_KX_MESSAGE, opaqueBlob, ASN1_ANY),
42} ASN1_SEQUENCE_END(GOST_KX_MESSAGE)
43
44IMPLEMENT_ASN1_FUNCTIONS(GOST_KX_MESSAGE)
45
46static int tls_construct_encrypted_extensions(SSL *s, WPACKET *pkt);
47
48/*
49 * ossl_statem_server13_read_transition() encapsulates the logic for the allowed
50 * handshake state transitions when a TLSv1.3 server is reading messages from
51 * the client. The message type that the client has sent is provided in |mt|.
52 * The current state is in |s->statem.hand_state|.
53 *
54 * Return values are 1 for success (transition allowed) and 0 on error
55 * (transition not allowed)
56 */
57static int ossl_statem_server13_read_transition(SSL *s, int mt)
58{
59 OSSL_STATEM *st = &s->statem;
60
61 /*
62 * Note: There is no case for TLS_ST_BEFORE because at that stage we have
63 * not negotiated TLSv1.3 yet, so that case is handled by
64 * ossl_statem_server_read_transition()
65 */
66 switch (st->hand_state) {
67 default:
68 break;
69
70 case TLS_ST_EARLY_DATA:
71 if (s->hello_retry_request == SSL_HRR_PENDING) {
72 if (mt == SSL3_MT_CLIENT_HELLO) {
73 st->hand_state = TLS_ST_SR_CLNT_HELLO;
74 return 1;
75 }
76 break;
77 } else if (s->ext.early_data == SSL_EARLY_DATA_ACCEPTED) {
78 if (mt == SSL3_MT_END_OF_EARLY_DATA) {
79 st->hand_state = TLS_ST_SR_END_OF_EARLY_DATA;
80 return 1;
81 }
82 break;
83 }
84 /* Fall through */
85
86 case TLS_ST_SR_END_OF_EARLY_DATA:
87 case TLS_ST_SW_FINISHED:
88 if (s->s3.tmp.cert_request) {
89 if (mt == SSL3_MT_CERTIFICATE) {
90 st->hand_state = TLS_ST_SR_CERT;
91 return 1;
92 }
93 } else {
94 if (mt == SSL3_MT_FINISHED) {
95 st->hand_state = TLS_ST_SR_FINISHED;
96 return 1;
97 }
98 }
99 break;
100
101 case TLS_ST_SR_CERT:
102 if (s->session->peer == NULL) {
103 if (mt == SSL3_MT_FINISHED) {
104 st->hand_state = TLS_ST_SR_FINISHED;
105 return 1;
106 }
107 } else {
108 if (mt == SSL3_MT_CERTIFICATE_VERIFY) {
109 st->hand_state = TLS_ST_SR_CERT_VRFY;
110 return 1;
111 }
112 }
113 break;
114
115 case TLS_ST_SR_CERT_VRFY:
116 if (mt == SSL3_MT_FINISHED) {
117 st->hand_state = TLS_ST_SR_FINISHED;
118 return 1;
119 }
120 break;
121
122 case TLS_ST_OK:
123 /*
124 * Its never ok to start processing handshake messages in the middle of
125 * early data (i.e. before we've received the end of early data alert)
126 */
127 if (s->early_data_state == SSL_EARLY_DATA_READING)
128 break;
129
130 if (mt == SSL3_MT_CERTIFICATE
131 && s->post_handshake_auth == SSL_PHA_REQUESTED) {
132 st->hand_state = TLS_ST_SR_CERT;
133 return 1;
134 }
135
136 if (mt == SSL3_MT_KEY_UPDATE) {
137 st->hand_state = TLS_ST_SR_KEY_UPDATE;
138 return 1;
139 }
140 break;
141 }
142
143 /* No valid transition found */
144 return 0;
145}
146
147/*
148 * ossl_statem_server_read_transition() encapsulates the logic for the allowed
149 * handshake state transitions when the server is reading messages from the
150 * client. The message type that the client has sent is provided in |mt|. The
151 * current state is in |s->statem.hand_state|.
152 *
153 * Return values are 1 for success (transition allowed) and 0 on error
154 * (transition not allowed)
155 */
156int ossl_statem_server_read_transition(SSL *s, int mt)
157{
158 OSSL_STATEM *st = &s->statem;
159
160 if (SSL_IS_TLS13(s)) {
161 if (!ossl_statem_server13_read_transition(s, mt))
162 goto err;
163 return 1;
164 }
165
166 switch (st->hand_state) {
167 default:
168 break;
169
170 case TLS_ST_BEFORE:
171 case TLS_ST_OK:
172 case DTLS_ST_SW_HELLO_VERIFY_REQUEST:
173 if (mt == SSL3_MT_CLIENT_HELLO) {
174 st->hand_state = TLS_ST_SR_CLNT_HELLO;
175 return 1;
176 }
177 break;
178
179 case TLS_ST_SW_SRVR_DONE:
180 /*
181 * If we get a CKE message after a ServerDone then either
182 * 1) We didn't request a Certificate
183 * OR
184 * 2) If we did request one then
185 * a) We allow no Certificate to be returned
186 * AND
187 * b) We are running SSL3 (in TLS1.0+ the client must return a 0
188 * list if we requested a certificate)
189 */
190 if (mt == SSL3_MT_CLIENT_KEY_EXCHANGE) {
191 if (s->s3.tmp.cert_request) {
192 if (s->version == SSL3_VERSION) {
193 if ((s->verify_mode & SSL_VERIFY_PEER)
194 && (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) {
195 /*
196 * This isn't an unexpected message as such - we're just
197 * not going to accept it because we require a client
198 * cert.
199 */
200 SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE,
201 SSL_F_OSSL_STATEM_SERVER_READ_TRANSITION,
202 SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
203 return 0;
204 }
205 st->hand_state = TLS_ST_SR_KEY_EXCH;
206 return 1;
207 }
208 } else {
209 st->hand_state = TLS_ST_SR_KEY_EXCH;
210 return 1;
211 }
212 } else if (s->s3.tmp.cert_request) {
213 if (mt == SSL3_MT_CERTIFICATE) {
214 st->hand_state = TLS_ST_SR_CERT;
215 return 1;
216 }
217 }
218 break;
219
220 case TLS_ST_SR_CERT:
221 if (mt == SSL3_MT_CLIENT_KEY_EXCHANGE) {
222 st->hand_state = TLS_ST_SR_KEY_EXCH;
223 return 1;
224 }
225 break;
226
227 case TLS_ST_SR_KEY_EXCH:
228 /*
229 * We should only process a CertificateVerify message if we have
230 * received a Certificate from the client. If so then |s->session->peer|
231 * will be non NULL. In some instances a CertificateVerify message is
232 * not required even if the peer has sent a Certificate (e.g. such as in
233 * the case of static DH). In that case |st->no_cert_verify| should be
234 * set.
235 */
236 if (s->session->peer == NULL || st->no_cert_verify) {
237 if (mt == SSL3_MT_CHANGE_CIPHER_SPEC) {
238 /*
239 * For the ECDH ciphersuites when the client sends its ECDH
240 * pub key in a certificate, the CertificateVerify message is
241 * not sent. Also for GOST ciphersuites when the client uses
242 * its key from the certificate for key exchange.
243 */
244 st->hand_state = TLS_ST_SR_CHANGE;
245 return 1;
246 }
247 } else {
248 if (mt == SSL3_MT_CERTIFICATE_VERIFY) {
249 st->hand_state = TLS_ST_SR_CERT_VRFY;
250 return 1;
251 }
252 }
253 break;
254
255 case TLS_ST_SR_CERT_VRFY:
256 if (mt == SSL3_MT_CHANGE_CIPHER_SPEC) {
257 st->hand_state = TLS_ST_SR_CHANGE;
258 return 1;
259 }
260 break;
261
262 case TLS_ST_SR_CHANGE:
263#ifndef OPENSSL_NO_NEXTPROTONEG
264 if (s->s3.npn_seen) {
265 if (mt == SSL3_MT_NEXT_PROTO) {
266 st->hand_state = TLS_ST_SR_NEXT_PROTO;
267 return 1;
268 }
269 } else {
270#endif
271 if (mt == SSL3_MT_FINISHED) {
272 st->hand_state = TLS_ST_SR_FINISHED;
273 return 1;
274 }
275#ifndef OPENSSL_NO_NEXTPROTONEG
276 }
277#endif
278 break;
279
280#ifndef OPENSSL_NO_NEXTPROTONEG
281 case TLS_ST_SR_NEXT_PROTO:
282 if (mt == SSL3_MT_FINISHED) {
283 st->hand_state = TLS_ST_SR_FINISHED;
284 return 1;
285 }
286 break;
287#endif
288
289 case TLS_ST_SW_FINISHED:
290 if (mt == SSL3_MT_CHANGE_CIPHER_SPEC) {
291 st->hand_state = TLS_ST_SR_CHANGE;
292 return 1;
293 }
294 break;
295 }
296
297 err:
298 /* No valid transition found */
299 if (SSL_IS_DTLS(s) && mt == SSL3_MT_CHANGE_CIPHER_SPEC) {
300 BIO *rbio;
301
302 /*
303 * CCS messages don't have a message sequence number so this is probably
304 * because of an out-of-order CCS. We'll just drop it.
305 */
306 s->init_num = 0;
307 s->rwstate = SSL_READING;
308 rbio = SSL_get_rbio(s);
309 BIO_clear_retry_flags(rbio);
310 BIO_set_retry_read(rbio);
311 return 0;
312 }
313 SSLfatal(s, SSL3_AD_UNEXPECTED_MESSAGE,
314 SSL_F_OSSL_STATEM_SERVER_READ_TRANSITION,
315 SSL_R_UNEXPECTED_MESSAGE);
316 return 0;
317}
318
319/*
320 * Should we send a ServerKeyExchange message?
321 *
322 * Valid return values are:
323 * 1: Yes
324 * 0: No
325 */
326static int send_server_key_exchange(SSL *s)
327{
328 unsigned long alg_k = s->s3.tmp.new_cipher->algorithm_mkey;
329
330 /*
331 * only send a ServerKeyExchange if DH or fortezza but we have a
332 * sign only certificate PSK: may send PSK identity hints For
333 * ECC ciphersuites, we send a serverKeyExchange message only if
334 * the cipher suite is either ECDH-anon or ECDHE. In other cases,
335 * the server certificate contains the server's public key for
336 * key exchange.
337 */
338 if (alg_k & (SSL_kDHE | SSL_kECDHE)
339 /*
340 * PSK: send ServerKeyExchange if PSK identity hint if
341 * provided
342 */
343#ifndef OPENSSL_NO_PSK
344 /* Only send SKE if we have identity hint for plain PSK */
345 || ((alg_k & (SSL_kPSK | SSL_kRSAPSK))
346 && s->cert->psk_identity_hint)
347 /* For other PSK always send SKE */
348 || (alg_k & (SSL_PSK & (SSL_kDHEPSK | SSL_kECDHEPSK)))
349#endif
350#ifndef OPENSSL_NO_SRP
351 /* SRP: send ServerKeyExchange */
352 || (alg_k & SSL_kSRP)
353#endif
354 ) {
355 return 1;
356 }
357
358 return 0;
359}
360
361/*
362 * Should we send a CertificateRequest message?
363 *
364 * Valid return values are:
365 * 1: Yes
366 * 0: No
367 */
368int send_certificate_request(SSL *s)
369{
370 if (
371 /* don't request cert unless asked for it: */
372 s->verify_mode & SSL_VERIFY_PEER
373 /*
374 * don't request if post-handshake-only unless doing
375 * post-handshake in TLSv1.3:
376 */
377 && (!SSL_IS_TLS13(s) || !(s->verify_mode & SSL_VERIFY_POST_HANDSHAKE)
378 || s->post_handshake_auth == SSL_PHA_REQUEST_PENDING)
379 /*
380 * if SSL_VERIFY_CLIENT_ONCE is set, don't request cert
381 * a second time:
382 */
383 && (s->certreqs_sent < 1 ||
384 !(s->verify_mode & SSL_VERIFY_CLIENT_ONCE))
385 /*
386 * never request cert in anonymous ciphersuites (see
387 * section "Certificate request" in SSL 3 drafts and in
388 * RFC 2246):
389 */
390 && (!(s->s3.tmp.new_cipher->algorithm_auth & SSL_aNULL)
391 /*
392 * ... except when the application insists on
393 * verification (against the specs, but statem_clnt.c accepts
394 * this for SSL 3)
395 */
396 || (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
397 /* don't request certificate for SRP auth */
398 && !(s->s3.tmp.new_cipher->algorithm_auth & SSL_aSRP)
399 /*
400 * With normal PSK Certificates and Certificate Requests
401 * are omitted
402 */
403 && !(s->s3.tmp.new_cipher->algorithm_auth & SSL_aPSK)) {
404 return 1;
405 }
406
407 return 0;
408}
409
410/*
411 * ossl_statem_server13_write_transition() works out what handshake state to
412 * move to next when a TLSv1.3 server is writing messages to be sent to the
413 * client.
414 */
415static WRITE_TRAN ossl_statem_server13_write_transition(SSL *s)
416{
417 OSSL_STATEM *st = &s->statem;
418
419 /*
420 * No case for TLS_ST_BEFORE, because at that stage we have not negotiated
421 * TLSv1.3 yet, so that is handled by ossl_statem_server_write_transition()
422 */
423
424 switch (st->hand_state) {
425 default:
426 /* Shouldn't happen */
427 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
428 SSL_F_OSSL_STATEM_SERVER13_WRITE_TRANSITION,
429 ERR_R_INTERNAL_ERROR);
430 return WRITE_TRAN_ERROR;
431
432 case TLS_ST_OK:
433 if (s->key_update != SSL_KEY_UPDATE_NONE) {
434 st->hand_state = TLS_ST_SW_KEY_UPDATE;
435 return WRITE_TRAN_CONTINUE;
436 }
437 if (s->post_handshake_auth == SSL_PHA_REQUEST_PENDING) {
438 st->hand_state = TLS_ST_SW_CERT_REQ;
439 return WRITE_TRAN_CONTINUE;
440 }
441 /* Try to read from the client instead */
442 return WRITE_TRAN_FINISHED;
443
444 case TLS_ST_SR_CLNT_HELLO:
445 st->hand_state = TLS_ST_SW_SRVR_HELLO;
446 return WRITE_TRAN_CONTINUE;
447
448 case TLS_ST_SW_SRVR_HELLO:
449 if ((s->options & SSL_OP_ENABLE_MIDDLEBOX_COMPAT) != 0
450 && s->hello_retry_request != SSL_HRR_COMPLETE)
451 st->hand_state = TLS_ST_SW_CHANGE;
452 else if (s->hello_retry_request == SSL_HRR_PENDING)
453 st->hand_state = TLS_ST_EARLY_DATA;
454 else
455 st->hand_state = TLS_ST_SW_ENCRYPTED_EXTENSIONS;
456 return WRITE_TRAN_CONTINUE;
457
458 case TLS_ST_SW_CHANGE:
459 if (s->hello_retry_request == SSL_HRR_PENDING)
460 st->hand_state = TLS_ST_EARLY_DATA;
461 else
462 st->hand_state = TLS_ST_SW_ENCRYPTED_EXTENSIONS;
463 return WRITE_TRAN_CONTINUE;
464
465 case TLS_ST_SW_ENCRYPTED_EXTENSIONS:
466 if (s->hit)
467 st->hand_state = TLS_ST_SW_FINISHED;
468 else if (send_certificate_request(s))
469 st->hand_state = TLS_ST_SW_CERT_REQ;
470 else
471 st->hand_state = TLS_ST_SW_CERT;
472
473 return WRITE_TRAN_CONTINUE;
474
475 case TLS_ST_SW_CERT_REQ:
476 if (s->post_handshake_auth == SSL_PHA_REQUEST_PENDING) {
477 s->post_handshake_auth = SSL_PHA_REQUESTED;
478 st->hand_state = TLS_ST_OK;
479 } else {
480 st->hand_state = TLS_ST_SW_CERT;
481 }
482 return WRITE_TRAN_CONTINUE;
483
484 case TLS_ST_SW_CERT:
485 st->hand_state = TLS_ST_SW_CERT_VRFY;
486 return WRITE_TRAN_CONTINUE;
487
488 case TLS_ST_SW_CERT_VRFY:
489 st->hand_state = TLS_ST_SW_FINISHED;
490 return WRITE_TRAN_CONTINUE;
491
492 case TLS_ST_SW_FINISHED:
493 st->hand_state = TLS_ST_EARLY_DATA;
494 return WRITE_TRAN_CONTINUE;
495
496 case TLS_ST_EARLY_DATA:
497 return WRITE_TRAN_FINISHED;
498
499 case TLS_ST_SR_FINISHED:
500 /*
501 * Technically we have finished the handshake at this point, but we're
502 * going to remain "in_init" for now and write out any session tickets
503 * immediately.
504 */
505 if (s->post_handshake_auth == SSL_PHA_REQUESTED) {
506 s->post_handshake_auth = SSL_PHA_EXT_RECEIVED;
507 } else if (!s->ext.ticket_expected) {
508 /*
509 * If we're not going to renew the ticket then we just finish the
510 * handshake at this point.
511 */
512 st->hand_state = TLS_ST_OK;
513 return WRITE_TRAN_CONTINUE;
514 }
515 if (s->num_tickets > s->sent_tickets)
516 st->hand_state = TLS_ST_SW_SESSION_TICKET;
517 else
518 st->hand_state = TLS_ST_OK;
519 return WRITE_TRAN_CONTINUE;
520
521 case TLS_ST_SR_KEY_UPDATE:
522 case TLS_ST_SW_KEY_UPDATE:
523 st->hand_state = TLS_ST_OK;
524 return WRITE_TRAN_CONTINUE;
525
526 case TLS_ST_SW_SESSION_TICKET:
527 /* In a resumption we only ever send a maximum of one new ticket.
528 * Following an initial handshake we send the number of tickets we have
529 * been configured for.
530 */
531 if (s->hit || s->num_tickets <= s->sent_tickets) {
532 /* We've written enough tickets out. */
533 st->hand_state = TLS_ST_OK;
534 }
535 return WRITE_TRAN_CONTINUE;
536 }
537}
538
539/*
540 * ossl_statem_server_write_transition() works out what handshake state to move
541 * to next when the server is writing messages to be sent to the client.
542 */
543WRITE_TRAN ossl_statem_server_write_transition(SSL *s)
544{
545 OSSL_STATEM *st = &s->statem;
546
547 /*
548 * Note that before the ClientHello we don't know what version we are going
549 * to negotiate yet, so we don't take this branch until later
550 */
551
552 if (SSL_IS_TLS13(s))
553 return ossl_statem_server13_write_transition(s);
554
555 switch (st->hand_state) {
556 default:
557 /* Shouldn't happen */
558 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
559 SSL_F_OSSL_STATEM_SERVER_WRITE_TRANSITION,
560 ERR_R_INTERNAL_ERROR);
561 return WRITE_TRAN_ERROR;
562
563 case TLS_ST_OK:
564 if (st->request_state == TLS_ST_SW_HELLO_REQ) {
565 /* We must be trying to renegotiate */
566 st->hand_state = TLS_ST_SW_HELLO_REQ;
567 st->request_state = TLS_ST_BEFORE;
568 return WRITE_TRAN_CONTINUE;
569 }
570 /* Must be an incoming ClientHello */
571 if (!tls_setup_handshake(s)) {
572 /* SSLfatal() already called */
573 return WRITE_TRAN_ERROR;
574 }
575 /* Fall through */
576
577 case TLS_ST_BEFORE:
578 /* Just go straight to trying to read from the client */
579 return WRITE_TRAN_FINISHED;
580
581 case TLS_ST_SW_HELLO_REQ:
582 st->hand_state = TLS_ST_OK;
583 return WRITE_TRAN_CONTINUE;
584
585 case TLS_ST_SR_CLNT_HELLO:
586 if (SSL_IS_DTLS(s) && !s->d1->cookie_verified
587 && (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE)) {
588 st->hand_state = DTLS_ST_SW_HELLO_VERIFY_REQUEST;
589 } else if (s->renegotiate == 0 && !SSL_IS_FIRST_HANDSHAKE(s)) {
590 /* We must have rejected the renegotiation */
591 st->hand_state = TLS_ST_OK;
592 return WRITE_TRAN_CONTINUE;
593 } else {
594 st->hand_state = TLS_ST_SW_SRVR_HELLO;
595 }
596 return WRITE_TRAN_CONTINUE;
597
598 case DTLS_ST_SW_HELLO_VERIFY_REQUEST:
599 return WRITE_TRAN_FINISHED;
600
601 case TLS_ST_SW_SRVR_HELLO:
602 if (s->hit) {
603 if (s->ext.ticket_expected)
604 st->hand_state = TLS_ST_SW_SESSION_TICKET;
605 else
606 st->hand_state = TLS_ST_SW_CHANGE;
607 } else {
608 /* Check if it is anon DH or anon ECDH, */
609 /* normal PSK or SRP */
610 if (!(s->s3.tmp.new_cipher->algorithm_auth &
611 (SSL_aNULL | SSL_aSRP | SSL_aPSK))) {
612 st->hand_state = TLS_ST_SW_CERT;
613 } else if (send_server_key_exchange(s)) {
614 st->hand_state = TLS_ST_SW_KEY_EXCH;
615 } else if (send_certificate_request(s)) {
616 st->hand_state = TLS_ST_SW_CERT_REQ;
617 } else {
618 st->hand_state = TLS_ST_SW_SRVR_DONE;
619 }
620 }
621 return WRITE_TRAN_CONTINUE;
622
623 case TLS_ST_SW_CERT:
624 if (s->ext.status_expected) {
625 st->hand_state = TLS_ST_SW_CERT_STATUS;
626 return WRITE_TRAN_CONTINUE;
627 }
628 /* Fall through */
629
630 case TLS_ST_SW_CERT_STATUS:
631 if (send_server_key_exchange(s)) {
632 st->hand_state = TLS_ST_SW_KEY_EXCH;
633 return WRITE_TRAN_CONTINUE;
634 }
635 /* Fall through */
636
637 case TLS_ST_SW_KEY_EXCH:
638 if (send_certificate_request(s)) {
639 st->hand_state = TLS_ST_SW_CERT_REQ;
640 return WRITE_TRAN_CONTINUE;
641 }
642 /* Fall through */
643
644 case TLS_ST_SW_CERT_REQ:
645 st->hand_state = TLS_ST_SW_SRVR_DONE;
646 return WRITE_TRAN_CONTINUE;
647
648 case TLS_ST_SW_SRVR_DONE:
649 return WRITE_TRAN_FINISHED;
650
651 case TLS_ST_SR_FINISHED:
652 if (s->hit) {
653 st->hand_state = TLS_ST_OK;
654 return WRITE_TRAN_CONTINUE;
655 } else if (s->ext.ticket_expected) {
656 st->hand_state = TLS_ST_SW_SESSION_TICKET;
657 } else {
658 st->hand_state = TLS_ST_SW_CHANGE;
659 }
660 return WRITE_TRAN_CONTINUE;
661
662 case TLS_ST_SW_SESSION_TICKET:
663 st->hand_state = TLS_ST_SW_CHANGE;
664 return WRITE_TRAN_CONTINUE;
665
666 case TLS_ST_SW_CHANGE:
667 st->hand_state = TLS_ST_SW_FINISHED;
668 return WRITE_TRAN_CONTINUE;
669
670 case TLS_ST_SW_FINISHED:
671 if (s->hit) {
672 return WRITE_TRAN_FINISHED;
673 }
674 st->hand_state = TLS_ST_OK;
675 return WRITE_TRAN_CONTINUE;
676 }
677}
678
679/*
680 * Perform any pre work that needs to be done prior to sending a message from
681 * the server to the client.
682 */
683WORK_STATE ossl_statem_server_pre_work(SSL *s, WORK_STATE wst)
684{
685 OSSL_STATEM *st = &s->statem;
686
687 switch (st->hand_state) {
688 default:
689 /* No pre work to be done */
690 break;
691
692 case TLS_ST_SW_HELLO_REQ:
693 s->shutdown = 0;
694 if (SSL_IS_DTLS(s))
695 dtls1_clear_sent_buffer(s);
696 break;
697
698 case DTLS_ST_SW_HELLO_VERIFY_REQUEST:
699 s->shutdown = 0;
700 if (SSL_IS_DTLS(s)) {
701 dtls1_clear_sent_buffer(s);
702 /* We don't buffer this message so don't use the timer */
703 st->use_timer = 0;
704 }
705 break;
706
707 case TLS_ST_SW_SRVR_HELLO:
708 if (SSL_IS_DTLS(s)) {
709 /*
710 * Messages we write from now on should be buffered and
711 * retransmitted if necessary, so we need to use the timer now
712 */
713 st->use_timer = 1;
714 }
715 break;
716
717 case TLS_ST_SW_SRVR_DONE:
718#ifndef OPENSSL_NO_SCTP
719 if (SSL_IS_DTLS(s) && BIO_dgram_is_sctp(SSL_get_wbio(s))) {
720 /* Calls SSLfatal() as required */
721 return dtls_wait_for_dry(s);
722 }
723#endif
724 return WORK_FINISHED_CONTINUE;
725
726 case TLS_ST_SW_SESSION_TICKET:
727 if (SSL_IS_TLS13(s) && s->sent_tickets == 0) {
728 /*
729 * Actually this is the end of the handshake, but we're going
730 * straight into writing the session ticket out. So we finish off
731 * the handshake, but keep the various buffers active.
732 *
733 * Calls SSLfatal as required.
734 */
735 return tls_finish_handshake(s, wst, 0, 0);
736 } if (SSL_IS_DTLS(s)) {
737 /*
738 * We're into the last flight. We don't retransmit the last flight
739 * unless we need to, so we don't use the timer
740 */
741 st->use_timer = 0;
742 }
743 break;
744
745 case TLS_ST_SW_CHANGE:
746 if (SSL_IS_TLS13(s))
747 break;
748 s->session->cipher = s->s3.tmp.new_cipher;
749 if (!s->method->ssl3_enc->setup_key_block(s)) {
750 /* SSLfatal() already called */
751 return WORK_ERROR;
752 }
753 if (SSL_IS_DTLS(s)) {
754 /*
755 * We're into the last flight. We don't retransmit the last flight
756 * unless we need to, so we don't use the timer. This might have
757 * already been set to 0 if we sent a NewSessionTicket message,
758 * but we'll set it again here in case we didn't.
759 */
760 st->use_timer = 0;
761 }
762 return WORK_FINISHED_CONTINUE;
763
764 case TLS_ST_EARLY_DATA:
765 if (s->early_data_state != SSL_EARLY_DATA_ACCEPTING
766 && (s->s3.flags & TLS1_FLAGS_STATELESS) == 0)
767 return WORK_FINISHED_CONTINUE;
768 /* Fall through */
769
770 case TLS_ST_OK:
771 /* Calls SSLfatal() as required */
772 return tls_finish_handshake(s, wst, 1, 1);
773 }
774
775 return WORK_FINISHED_CONTINUE;
776}
777
778static ossl_inline int conn_is_closed(void)
779{
780 switch (get_last_sys_error()) {
781#if defined(EPIPE)
782 case EPIPE:
783 return 1;
784#endif
785#if defined(ECONNRESET)
786 case ECONNRESET:
787 return 1;
788#endif
789#if defined(WSAECONNRESET)
790 case WSAECONNRESET:
791 return 1;
792#endif
793 default:
794 return 0;
795 }
796}
797
798/*
799 * Perform any work that needs to be done after sending a message from the
800 * server to the client.
801 */
802WORK_STATE ossl_statem_server_post_work(SSL *s, WORK_STATE wst)
803{
804 OSSL_STATEM *st = &s->statem;
805
806 s->init_num = 0;
807
808 switch (st->hand_state) {
809 default:
810 /* No post work to be done */
811 break;
812
813 case TLS_ST_SW_HELLO_REQ:
814 if (statem_flush(s) != 1)
815 return WORK_MORE_A;
816 if (!ssl3_init_finished_mac(s)) {
817 /* SSLfatal() already called */
818 return WORK_ERROR;
819 }
820 break;
821
822 case DTLS_ST_SW_HELLO_VERIFY_REQUEST:
823 if (statem_flush(s) != 1)
824 return WORK_MORE_A;
825 /* HelloVerifyRequest resets Finished MAC */
826 if (s->version != DTLS1_BAD_VER && !ssl3_init_finished_mac(s)) {
827 /* SSLfatal() already called */
828 return WORK_ERROR;
829 }
830 /*
831 * The next message should be another ClientHello which we need to
832 * treat like it was the first packet
833 */
834 s->first_packet = 1;
835 break;
836
837 case TLS_ST_SW_SRVR_HELLO:
838 if (SSL_IS_TLS13(s) && s->hello_retry_request == SSL_HRR_PENDING) {
839 if ((s->options & SSL_OP_ENABLE_MIDDLEBOX_COMPAT) == 0
840 && statem_flush(s) != 1)
841 return WORK_MORE_A;
842 break;
843 }
844#ifndef OPENSSL_NO_SCTP
845 if (SSL_IS_DTLS(s) && s->hit) {
846 unsigned char sctpauthkey[64];
847 char labelbuffer[sizeof(DTLS1_SCTP_AUTH_LABEL)];
848 size_t labellen;
849
850 /*
851 * Add new shared key for SCTP-Auth, will be ignored if no
852 * SCTP used.
853 */
854 memcpy(labelbuffer, DTLS1_SCTP_AUTH_LABEL,
855 sizeof(DTLS1_SCTP_AUTH_LABEL));
856
857 /* Don't include the terminating zero. */
858 labellen = sizeof(labelbuffer) - 1;
859 if (s->mode & SSL_MODE_DTLS_SCTP_LABEL_LENGTH_BUG)
860 labellen += 1;
861
862 if (SSL_export_keying_material(s, sctpauthkey,
863 sizeof(sctpauthkey), labelbuffer,
864 labellen, NULL, 0,
865 0) <= 0) {
866 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
867 SSL_F_OSSL_STATEM_SERVER_POST_WORK,
868 ERR_R_INTERNAL_ERROR);
869 return WORK_ERROR;
870 }
871
872 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
873 sizeof(sctpauthkey), sctpauthkey);
874 }
875#endif
876 if (!SSL_IS_TLS13(s)
877 || ((s->options & SSL_OP_ENABLE_MIDDLEBOX_COMPAT) != 0
878 && s->hello_retry_request != SSL_HRR_COMPLETE))
879 break;
880 /* Fall through */
881
882 case TLS_ST_SW_CHANGE:
883 if (s->hello_retry_request == SSL_HRR_PENDING) {
884 if (!statem_flush(s))
885 return WORK_MORE_A;
886 break;
887 }
888
889 if (SSL_IS_TLS13(s)) {
890 if (!s->method->ssl3_enc->setup_key_block(s)
891 || !s->method->ssl3_enc->change_cipher_state(s,
892 SSL3_CC_HANDSHAKE | SSL3_CHANGE_CIPHER_SERVER_WRITE)) {
893 /* SSLfatal() already called */
894 return WORK_ERROR;
895 }
896
897 if (s->ext.early_data != SSL_EARLY_DATA_ACCEPTED
898 && !s->method->ssl3_enc->change_cipher_state(s,
899 SSL3_CC_HANDSHAKE |SSL3_CHANGE_CIPHER_SERVER_READ)) {
900 /* SSLfatal() already called */
901 return WORK_ERROR;
902 }
903 /*
904 * We don't yet know whether the next record we are going to receive
905 * is an unencrypted alert, an encrypted alert, or an encrypted
906 * handshake message. We temporarily tolerate unencrypted alerts.
907 */
908 s->statem.enc_read_state = ENC_READ_STATE_ALLOW_PLAIN_ALERTS;
909 break;
910 }
911
912#ifndef OPENSSL_NO_SCTP
913 if (SSL_IS_DTLS(s) && !s->hit) {
914 /*
915 * Change to new shared key of SCTP-Auth, will be ignored if
916 * no SCTP used.
917 */
918 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY,
919 0, NULL);
920 }
921#endif
922 if (!s->method->ssl3_enc->change_cipher_state(s,
923 SSL3_CHANGE_CIPHER_SERVER_WRITE))
924 {
925 /* SSLfatal() already called */
926 return WORK_ERROR;
927 }
928
929 if (SSL_IS_DTLS(s))
930 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
931 break;
932
933 case TLS_ST_SW_SRVR_DONE:
934 if (statem_flush(s) != 1)
935 return WORK_MORE_A;
936 break;
937
938 case TLS_ST_SW_FINISHED:
939 if (statem_flush(s) != 1)
940 return WORK_MORE_A;
941#ifndef OPENSSL_NO_SCTP
942 if (SSL_IS_DTLS(s) && s->hit) {
943 /*
944 * Change to new shared key of SCTP-Auth, will be ignored if
945 * no SCTP used.
946 */
947 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY,
948 0, NULL);
949 }
950#endif
951 if (SSL_IS_TLS13(s)) {
952 if (!s->method->ssl3_enc->generate_master_secret(s,
953 s->master_secret, s->handshake_secret, 0,
954 &s->session->master_key_length)
955 || !s->method->ssl3_enc->change_cipher_state(s,
956 SSL3_CC_APPLICATION | SSL3_CHANGE_CIPHER_SERVER_WRITE))
957 /* SSLfatal() already called */
958 return WORK_ERROR;
959 }
960 break;
961
962 case TLS_ST_SW_CERT_REQ:
963 if (s->post_handshake_auth == SSL_PHA_REQUEST_PENDING) {
964 if (statem_flush(s) != 1)
965 return WORK_MORE_A;
966 }
967 break;
968
969 case TLS_ST_SW_KEY_UPDATE:
970 if (statem_flush(s) != 1)
971 return WORK_MORE_A;
972 if (!tls13_update_key(s, 1)) {
973 /* SSLfatal() already called */
974 return WORK_ERROR;
975 }
976 break;
977
978 case TLS_ST_SW_SESSION_TICKET:
979 clear_sys_error();
980 if (SSL_IS_TLS13(s) && statem_flush(s) != 1) {
981 if (SSL_get_error(s, 0) == SSL_ERROR_SYSCALL
982 && conn_is_closed()) {
983 /*
984 * We ignore connection closed errors in TLSv1.3 when sending a
985 * NewSessionTicket and behave as if we were successful. This is
986 * so that we are still able to read data sent to us by a client
987 * that closes soon after the end of the handshake without
988 * waiting to read our post-handshake NewSessionTickets.
989 */
990 s->rwstate = SSL_NOTHING;
991 break;
992 }
993
994 return WORK_MORE_A;
995 }
996 break;
997 }
998
999 return WORK_FINISHED_CONTINUE;
1000}
1001
1002/*
1003 * Get the message construction function and message type for sending from the
1004 * server
1005 *
1006 * Valid return values are:
1007 * 1: Success
1008 * 0: Error
1009 */
1010int ossl_statem_server_construct_message(SSL *s, WPACKET *pkt,
1011 confunc_f *confunc, int *mt)
1012{
1013 OSSL_STATEM *st = &s->statem;
1014
1015 switch (st->hand_state) {
1016 default:
1017 /* Shouldn't happen */
1018 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
1019 SSL_F_OSSL_STATEM_SERVER_CONSTRUCT_MESSAGE,
1020 SSL_R_BAD_HANDSHAKE_STATE);
1021 return 0;
1022
1023 case TLS_ST_SW_CHANGE:
1024 if (SSL_IS_DTLS(s))
1025 *confunc = dtls_construct_change_cipher_spec;
1026 else
1027 *confunc = tls_construct_change_cipher_spec;
1028 *mt = SSL3_MT_CHANGE_CIPHER_SPEC;
1029 break;
1030
1031 case DTLS_ST_SW_HELLO_VERIFY_REQUEST:
1032 *confunc = dtls_construct_hello_verify_request;
1033 *mt = DTLS1_MT_HELLO_VERIFY_REQUEST;
1034 break;
1035
1036 case TLS_ST_SW_HELLO_REQ:
1037 /* No construction function needed */
1038 *confunc = NULL;
1039 *mt = SSL3_MT_HELLO_REQUEST;
1040 break;
1041
1042 case TLS_ST_SW_SRVR_HELLO:
1043 *confunc = tls_construct_server_hello;
1044 *mt = SSL3_MT_SERVER_HELLO;
1045 break;
1046
1047 case TLS_ST_SW_CERT:
1048 *confunc = tls_construct_server_certificate;
1049 *mt = SSL3_MT_CERTIFICATE;
1050 break;
1051
1052 case TLS_ST_SW_CERT_VRFY:
1053 *confunc = tls_construct_cert_verify;
1054 *mt = SSL3_MT_CERTIFICATE_VERIFY;
1055 break;
1056
1057
1058 case TLS_ST_SW_KEY_EXCH:
1059 *confunc = tls_construct_server_key_exchange;
1060 *mt = SSL3_MT_SERVER_KEY_EXCHANGE;
1061 break;
1062
1063 case TLS_ST_SW_CERT_REQ:
1064 *confunc = tls_construct_certificate_request;
1065 *mt = SSL3_MT_CERTIFICATE_REQUEST;
1066 break;
1067
1068 case TLS_ST_SW_SRVR_DONE:
1069 *confunc = tls_construct_server_done;
1070 *mt = SSL3_MT_SERVER_DONE;
1071 break;
1072
1073 case TLS_ST_SW_SESSION_TICKET:
1074 *confunc = tls_construct_new_session_ticket;
1075 *mt = SSL3_MT_NEWSESSION_TICKET;
1076 break;
1077
1078 case TLS_ST_SW_CERT_STATUS:
1079 *confunc = tls_construct_cert_status;
1080 *mt = SSL3_MT_CERTIFICATE_STATUS;
1081 break;
1082
1083 case TLS_ST_SW_FINISHED:
1084 *confunc = tls_construct_finished;
1085 *mt = SSL3_MT_FINISHED;
1086 break;
1087
1088 case TLS_ST_EARLY_DATA:
1089 *confunc = NULL;
1090 *mt = SSL3_MT_DUMMY;
1091 break;
1092
1093 case TLS_ST_SW_ENCRYPTED_EXTENSIONS:
1094 *confunc = tls_construct_encrypted_extensions;
1095 *mt = SSL3_MT_ENCRYPTED_EXTENSIONS;
1096 break;
1097
1098 case TLS_ST_SW_KEY_UPDATE:
1099 *confunc = tls_construct_key_update;
1100 *mt = SSL3_MT_KEY_UPDATE;
1101 break;
1102 }
1103
1104 return 1;
1105}
1106
1107/*
1108 * Maximum size (excluding the Handshake header) of a ClientHello message,
1109 * calculated as follows:
1110 *
1111 * 2 + # client_version
1112 * 32 + # only valid length for random
1113 * 1 + # length of session_id
1114 * 32 + # maximum size for session_id
1115 * 2 + # length of cipher suites
1116 * 2^16-2 + # maximum length of cipher suites array
1117 * 1 + # length of compression_methods
1118 * 2^8-1 + # maximum length of compression methods
1119 * 2 + # length of extensions
1120 * 2^16-1 # maximum length of extensions
1121 */
1122#define CLIENT_HELLO_MAX_LENGTH 131396
1123
1124#define CLIENT_KEY_EXCH_MAX_LENGTH 2048
1125#define NEXT_PROTO_MAX_LENGTH 514
1126
1127/*
1128 * Returns the maximum allowed length for the current message that we are
1129 * reading. Excludes the message header.
1130 */
1131size_t ossl_statem_server_max_message_size(SSL *s)
1132{
1133 OSSL_STATEM *st = &s->statem;
1134
1135 switch (st->hand_state) {
1136 default:
1137 /* Shouldn't happen */
1138 return 0;
1139
1140 case TLS_ST_SR_CLNT_HELLO:
1141 return CLIENT_HELLO_MAX_LENGTH;
1142
1143 case TLS_ST_SR_END_OF_EARLY_DATA:
1144 return END_OF_EARLY_DATA_MAX_LENGTH;
1145
1146 case TLS_ST_SR_CERT:
1147 return s->max_cert_list;
1148
1149 case TLS_ST_SR_KEY_EXCH:
1150 return CLIENT_KEY_EXCH_MAX_LENGTH;
1151
1152 case TLS_ST_SR_CERT_VRFY:
1153 return SSL3_RT_MAX_PLAIN_LENGTH;
1154
1155#ifndef OPENSSL_NO_NEXTPROTONEG
1156 case TLS_ST_SR_NEXT_PROTO:
1157 return NEXT_PROTO_MAX_LENGTH;
1158#endif
1159
1160 case TLS_ST_SR_CHANGE:
1161 return CCS_MAX_LENGTH;
1162
1163 case TLS_ST_SR_FINISHED:
1164 return FINISHED_MAX_LENGTH;
1165
1166 case TLS_ST_SR_KEY_UPDATE:
1167 return KEY_UPDATE_MAX_LENGTH;
1168 }
1169}
1170
1171/*
1172 * Process a message that the server has received from the client.
1173 */
1174MSG_PROCESS_RETURN ossl_statem_server_process_message(SSL *s, PACKET *pkt)
1175{
1176 OSSL_STATEM *st = &s->statem;
1177
1178 switch (st->hand_state) {
1179 default:
1180 /* Shouldn't happen */
1181 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
1182 SSL_F_OSSL_STATEM_SERVER_PROCESS_MESSAGE,
1183 ERR_R_INTERNAL_ERROR);
1184 return MSG_PROCESS_ERROR;
1185
1186 case TLS_ST_SR_CLNT_HELLO:
1187 return tls_process_client_hello(s, pkt);
1188
1189 case TLS_ST_SR_END_OF_EARLY_DATA:
1190 return tls_process_end_of_early_data(s, pkt);
1191
1192 case TLS_ST_SR_CERT:
1193 return tls_process_client_certificate(s, pkt);
1194
1195 case TLS_ST_SR_KEY_EXCH:
1196 return tls_process_client_key_exchange(s, pkt);
1197
1198 case TLS_ST_SR_CERT_VRFY:
1199 return tls_process_cert_verify(s, pkt);
1200
1201#ifndef OPENSSL_NO_NEXTPROTONEG
1202 case TLS_ST_SR_NEXT_PROTO:
1203 return tls_process_next_proto(s, pkt);
1204#endif
1205
1206 case TLS_ST_SR_CHANGE:
1207 return tls_process_change_cipher_spec(s, pkt);
1208
1209 case TLS_ST_SR_FINISHED:
1210 return tls_process_finished(s, pkt);
1211
1212 case TLS_ST_SR_KEY_UPDATE:
1213 return tls_process_key_update(s, pkt);
1214
1215 }
1216}
1217
1218/*
1219 * Perform any further processing required following the receipt of a message
1220 * from the client
1221 */
1222WORK_STATE ossl_statem_server_post_process_message(SSL *s, WORK_STATE wst)
1223{
1224 OSSL_STATEM *st = &s->statem;
1225
1226 switch (st->hand_state) {
1227 default:
1228 /* Shouldn't happen */
1229 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
1230 SSL_F_OSSL_STATEM_SERVER_POST_PROCESS_MESSAGE,
1231 ERR_R_INTERNAL_ERROR);
1232 return WORK_ERROR;
1233
1234 case TLS_ST_SR_CLNT_HELLO:
1235 return tls_post_process_client_hello(s, wst);
1236
1237 case TLS_ST_SR_KEY_EXCH:
1238 return tls_post_process_client_key_exchange(s, wst);
1239 }
1240}
1241
1242#ifndef OPENSSL_NO_SRP
1243/* Returns 1 on success, 0 for retryable error, -1 for fatal error */
1244static int ssl_check_srp_ext_ClientHello(SSL *s)
1245{
1246 int ret;
1247 int al = SSL_AD_UNRECOGNIZED_NAME;
1248
1249 if ((s->s3.tmp.new_cipher->algorithm_mkey & SSL_kSRP) &&
1250 (s->srp_ctx.TLS_ext_srp_username_callback != NULL)) {
1251 if (s->srp_ctx.login == NULL) {
1252 /*
1253 * RFC 5054 says SHOULD reject, we do so if There is no srp
1254 * login name
1255 */
1256 SSLfatal(s, SSL_AD_UNKNOWN_PSK_IDENTITY,
1257 SSL_F_SSL_CHECK_SRP_EXT_CLIENTHELLO,
1258 SSL_R_PSK_IDENTITY_NOT_FOUND);
1259 return -1;
1260 } else {
1261 ret = SSL_srp_server_param_with_username(s, &al);
1262 if (ret < 0)
1263 return 0;
1264 if (ret == SSL3_AL_FATAL) {
1265 SSLfatal(s, al, SSL_F_SSL_CHECK_SRP_EXT_CLIENTHELLO,
1266 al == SSL_AD_UNKNOWN_PSK_IDENTITY
1267 ? SSL_R_PSK_IDENTITY_NOT_FOUND
1268 : SSL_R_CLIENTHELLO_TLSEXT);
1269 return -1;
1270 }
1271 }
1272 }
1273 return 1;
1274}
1275#endif
1276
1277int dtls_raw_hello_verify_request(WPACKET *pkt, unsigned char *cookie,
1278 size_t cookie_len)
1279{
1280 /* Always use DTLS 1.0 version: see RFC 6347 */
1281 if (!WPACKET_put_bytes_u16(pkt, DTLS1_VERSION)
1282 || !WPACKET_sub_memcpy_u8(pkt, cookie, cookie_len))
1283 return 0;
1284
1285 return 1;
1286}
1287
1288int dtls_construct_hello_verify_request(SSL *s, WPACKET *pkt)
1289{
1290 unsigned int cookie_leni;
1291 if (s->ctx->app_gen_cookie_cb == NULL ||
1292 s->ctx->app_gen_cookie_cb(s, s->d1->cookie,
1293 &cookie_leni) == 0 ||
1294 cookie_leni > 255) {
1295 SSLfatal(s, SSL_AD_NO_ALERT, SSL_F_DTLS_CONSTRUCT_HELLO_VERIFY_REQUEST,
1296 SSL_R_COOKIE_GEN_CALLBACK_FAILURE);
1297 return 0;
1298 }
1299 s->d1->cookie_len = cookie_leni;
1300
1301 if (!dtls_raw_hello_verify_request(pkt, s->d1->cookie,
1302 s->d1->cookie_len)) {
1303 SSLfatal(s, SSL_AD_NO_ALERT, SSL_F_DTLS_CONSTRUCT_HELLO_VERIFY_REQUEST,
1304 ERR_R_INTERNAL_ERROR);
1305 return 0;
1306 }
1307
1308 return 1;
1309}
1310
1311#ifndef OPENSSL_NO_EC
1312/*-
1313 * ssl_check_for_safari attempts to fingerprint Safari using OS X
1314 * SecureTransport using the TLS extension block in |hello|.
1315 * Safari, since 10.6, sends exactly these extensions, in this order:
1316 * SNI,
1317 * elliptic_curves
1318 * ec_point_formats
1319 * signature_algorithms (for TLSv1.2 only)
1320 *
1321 * We wish to fingerprint Safari because they broke ECDHE-ECDSA support in 10.8,
1322 * but they advertise support. So enabling ECDHE-ECDSA ciphers breaks them.
1323 * Sadly we cannot differentiate 10.6, 10.7 and 10.8.4 (which work), from
1324 * 10.8..10.8.3 (which don't work).
1325 */
1326static void ssl_check_for_safari(SSL *s, const CLIENTHELLO_MSG *hello)
1327{
1328 static const unsigned char kSafariExtensionsBlock[] = {
1329 0x00, 0x0a, /* elliptic_curves extension */
1330 0x00, 0x08, /* 8 bytes */
1331 0x00, 0x06, /* 6 bytes of curve ids */
1332 0x00, 0x17, /* P-256 */
1333 0x00, 0x18, /* P-384 */
1334 0x00, 0x19, /* P-521 */
1335
1336 0x00, 0x0b, /* ec_point_formats */
1337 0x00, 0x02, /* 2 bytes */
1338 0x01, /* 1 point format */
1339 0x00, /* uncompressed */
1340 /* The following is only present in TLS 1.2 */
1341 0x00, 0x0d, /* signature_algorithms */
1342 0x00, 0x0c, /* 12 bytes */
1343 0x00, 0x0a, /* 10 bytes */
1344 0x05, 0x01, /* SHA-384/RSA */
1345 0x04, 0x01, /* SHA-256/RSA */
1346 0x02, 0x01, /* SHA-1/RSA */
1347 0x04, 0x03, /* SHA-256/ECDSA */
1348 0x02, 0x03, /* SHA-1/ECDSA */
1349 };
1350 /* Length of the common prefix (first two extensions). */
1351 static const size_t kSafariCommonExtensionsLength = 18;
1352 unsigned int type;
1353 PACKET sni, tmppkt;
1354 size_t ext_len;
1355
1356 tmppkt = hello->extensions;
1357
1358 if (!PACKET_forward(&tmppkt, 2)
1359 || !PACKET_get_net_2(&tmppkt, &type)
1360 || !PACKET_get_length_prefixed_2(&tmppkt, &sni)) {
1361 return;
1362 }
1363
1364 if (type != TLSEXT_TYPE_server_name)
1365 return;
1366
1367 ext_len = TLS1_get_client_version(s) >= TLS1_2_VERSION ?
1368 sizeof(kSafariExtensionsBlock) : kSafariCommonExtensionsLength;
1369
1370 s->s3.is_probably_safari = PACKET_equal(&tmppkt, kSafariExtensionsBlock,
1371 ext_len);
1372}
1373#endif /* !OPENSSL_NO_EC */
1374
1375MSG_PROCESS_RETURN tls_process_client_hello(SSL *s, PACKET *pkt)
1376{
1377 /* |cookie| will only be initialized for DTLS. */
1378 PACKET session_id, compression, extensions, cookie;
1379 static const unsigned char null_compression = 0;
1380 CLIENTHELLO_MSG *clienthello = NULL;
1381
1382 /* Check if this is actually an unexpected renegotiation ClientHello */
1383 if (s->renegotiate == 0 && !SSL_IS_FIRST_HANDSHAKE(s)) {
1384 if (!ossl_assert(!SSL_IS_TLS13(s))) {
1385 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CLIENT_HELLO,
1386 ERR_R_INTERNAL_ERROR);
1387 goto err;
1388 }
1389 if ((s->options & SSL_OP_NO_RENEGOTIATION) != 0
1390 || (!s->s3.send_connection_binding
1391 && (s->options
1392 & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION) == 0)) {
1393 ssl3_send_alert(s, SSL3_AL_WARNING, SSL_AD_NO_RENEGOTIATION);
1394 return MSG_PROCESS_FINISHED_READING;
1395 }
1396 s->renegotiate = 1;
1397 s->new_session = 1;
1398 }
1399
1400 clienthello = OPENSSL_zalloc(sizeof(*clienthello));
1401 if (clienthello == NULL) {
1402 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CLIENT_HELLO,
1403 ERR_R_INTERNAL_ERROR);
1404 goto err;
1405 }
1406
1407 /*
1408 * First, parse the raw ClientHello data into the CLIENTHELLO_MSG structure.
1409 */
1410 clienthello->isv2 = RECORD_LAYER_is_sslv2_record(&s->rlayer);
1411 PACKET_null_init(&cookie);
1412
1413 if (clienthello->isv2) {
1414 unsigned int mt;
1415
1416 if (!SSL_IS_FIRST_HANDSHAKE(s)
1417 || s->hello_retry_request != SSL_HRR_NONE) {
1418 SSLfatal(s, SSL_AD_UNEXPECTED_MESSAGE,
1419 SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_UNEXPECTED_MESSAGE);
1420 goto err;
1421 }
1422
1423 /*-
1424 * An SSLv3/TLSv1 backwards-compatible CLIENT-HELLO in an SSLv2
1425 * header is sent directly on the wire, not wrapped as a TLS
1426 * record. Our record layer just processes the message length and passes
1427 * the rest right through. Its format is:
1428 * Byte Content
1429 * 0-1 msg_length - decoded by the record layer
1430 * 2 msg_type - s->init_msg points here
1431 * 3-4 version
1432 * 5-6 cipher_spec_length
1433 * 7-8 session_id_length
1434 * 9-10 challenge_length
1435 * ... ...
1436 */
1437
1438 if (!PACKET_get_1(pkt, &mt)
1439 || mt != SSL2_MT_CLIENT_HELLO) {
1440 /*
1441 * Should never happen. We should have tested this in the record
1442 * layer in order to have determined that this is a SSLv2 record
1443 * in the first place
1444 */
1445 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CLIENT_HELLO,
1446 ERR_R_INTERNAL_ERROR);
1447 goto err;
1448 }
1449 }
1450
1451 if (!PACKET_get_net_2(pkt, &clienthello->legacy_version)) {
1452 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PROCESS_CLIENT_HELLO,
1453 SSL_R_LENGTH_TOO_SHORT);
1454 goto err;
1455 }
1456
1457 /* Parse the message and load client random. */
1458 if (clienthello->isv2) {
1459 /*
1460 * Handle an SSLv2 backwards compatible ClientHello
1461 * Note, this is only for SSLv3+ using the backward compatible format.
1462 * Real SSLv2 is not supported, and is rejected below.
1463 */
1464 unsigned int ciphersuite_len, session_id_len, challenge_len;
1465 PACKET challenge;
1466
1467 if (!PACKET_get_net_2(pkt, &ciphersuite_len)
1468 || !PACKET_get_net_2(pkt, &session_id_len)
1469 || !PACKET_get_net_2(pkt, &challenge_len)) {
1470 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PROCESS_CLIENT_HELLO,
1471 SSL_R_RECORD_LENGTH_MISMATCH);
1472 goto err;
1473 }
1474
1475 if (session_id_len > SSL_MAX_SSL_SESSION_ID_LENGTH) {
1476 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER,
1477 SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_LENGTH_MISMATCH);
1478 goto err;
1479 }
1480
1481 if (!PACKET_get_sub_packet(pkt, &clienthello->ciphersuites,
1482 ciphersuite_len)
1483 || !PACKET_copy_bytes(pkt, clienthello->session_id, session_id_len)
1484 || !PACKET_get_sub_packet(pkt, &challenge, challenge_len)
1485 /* No extensions. */
1486 || PACKET_remaining(pkt) != 0) {
1487 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PROCESS_CLIENT_HELLO,
1488 SSL_R_RECORD_LENGTH_MISMATCH);
1489 goto err;
1490 }
1491 clienthello->session_id_len = session_id_len;
1492
1493 /* Load the client random and compression list. We use SSL3_RANDOM_SIZE
1494 * here rather than sizeof(clienthello->random) because that is the limit
1495 * for SSLv3 and it is fixed. It won't change even if
1496 * sizeof(clienthello->random) does.
1497 */
1498 challenge_len = challenge_len > SSL3_RANDOM_SIZE
1499 ? SSL3_RANDOM_SIZE : challenge_len;
1500 memset(clienthello->random, 0, SSL3_RANDOM_SIZE);
1501 if (!PACKET_copy_bytes(&challenge,
1502 clienthello->random + SSL3_RANDOM_SIZE -
1503 challenge_len, challenge_len)
1504 /* Advertise only null compression. */
1505 || !PACKET_buf_init(&compression, &null_compression, 1)) {
1506 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CLIENT_HELLO,
1507 ERR_R_INTERNAL_ERROR);
1508 goto err;
1509 }
1510
1511 PACKET_null_init(&clienthello->extensions);
1512 } else {
1513 /* Regular ClientHello. */
1514 if (!PACKET_copy_bytes(pkt, clienthello->random, SSL3_RANDOM_SIZE)
1515 || !PACKET_get_length_prefixed_1(pkt, &session_id)
1516 || !PACKET_copy_all(&session_id, clienthello->session_id,
1517 SSL_MAX_SSL_SESSION_ID_LENGTH,
1518 &clienthello->session_id_len)) {
1519 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PROCESS_CLIENT_HELLO,
1520 SSL_R_LENGTH_MISMATCH);
1521 goto err;
1522 }
1523
1524 if (SSL_IS_DTLS(s)) {
1525 if (!PACKET_get_length_prefixed_1(pkt, &cookie)) {
1526 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PROCESS_CLIENT_HELLO,
1527 SSL_R_LENGTH_MISMATCH);
1528 goto err;
1529 }
1530 if (!PACKET_copy_all(&cookie, clienthello->dtls_cookie,
1531 DTLS1_COOKIE_LENGTH,
1532 &clienthello->dtls_cookie_len)) {
1533 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
1534 SSL_F_TLS_PROCESS_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
1535 goto err;
1536 }
1537 /*
1538 * If we require cookies and this ClientHello doesn't contain one,
1539 * just return since we do not want to allocate any memory yet.
1540 * So check cookie length...
1541 */
1542 if (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) {
1543 if (clienthello->dtls_cookie_len == 0) {
1544 OPENSSL_free(clienthello);
1545 return MSG_PROCESS_FINISHED_READING;
1546 }
1547 }
1548 }
1549
1550 if (!PACKET_get_length_prefixed_2(pkt, &clienthello->ciphersuites)) {
1551 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PROCESS_CLIENT_HELLO,
1552 SSL_R_LENGTH_MISMATCH);
1553 goto err;
1554 }
1555
1556 if (!PACKET_get_length_prefixed_1(pkt, &compression)) {
1557 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PROCESS_CLIENT_HELLO,
1558 SSL_R_LENGTH_MISMATCH);
1559 goto err;
1560 }
1561
1562 /* Could be empty. */
1563 if (PACKET_remaining(pkt) == 0) {
1564 PACKET_null_init(&clienthello->extensions);
1565 } else {
1566 if (!PACKET_get_length_prefixed_2(pkt, &clienthello->extensions)
1567 || PACKET_remaining(pkt) != 0) {
1568 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PROCESS_CLIENT_HELLO,
1569 SSL_R_LENGTH_MISMATCH);
1570 goto err;
1571 }
1572 }
1573 }
1574
1575 if (!PACKET_copy_all(&compression, clienthello->compressions,
1576 MAX_COMPRESSIONS_SIZE,
1577 &clienthello->compressions_len)) {
1578 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CLIENT_HELLO,
1579 ERR_R_INTERNAL_ERROR);
1580 goto err;
1581 }
1582
1583 /* Preserve the raw extensions PACKET for later use */
1584 extensions = clienthello->extensions;
1585 if (!tls_collect_extensions(s, &extensions, SSL_EXT_CLIENT_HELLO,
1586 &clienthello->pre_proc_exts,
1587 &clienthello->pre_proc_exts_len, 1)) {
1588 /* SSLfatal already been called */
1589 goto err;
1590 }
1591 s->clienthello = clienthello;
1592
1593 return MSG_PROCESS_CONTINUE_PROCESSING;
1594
1595 err:
1596 if (clienthello != NULL)
1597 OPENSSL_free(clienthello->pre_proc_exts);
1598 OPENSSL_free(clienthello);
1599
1600 return MSG_PROCESS_ERROR;
1601}
1602
1603static int tls_early_post_process_client_hello(SSL *s)
1604{
1605 unsigned int j;
1606 int i, al = SSL_AD_INTERNAL_ERROR;
1607 int protverr;
1608 size_t loop;
1609 unsigned long id;
1610#ifndef OPENSSL_NO_COMP
1611 SSL_COMP *comp = NULL;
1612#endif
1613 const SSL_CIPHER *c;
1614 STACK_OF(SSL_CIPHER) *ciphers = NULL;
1615 STACK_OF(SSL_CIPHER) *scsvs = NULL;
1616 CLIENTHELLO_MSG *clienthello = s->clienthello;
1617 DOWNGRADE dgrd = DOWNGRADE_NONE;
1618
1619 /* Finished parsing the ClientHello, now we can start processing it */
1620 /* Give the ClientHello callback a crack at things */
1621 if (s->ctx->client_hello_cb != NULL) {
1622 /* A failure in the ClientHello callback terminates the connection. */
1623 switch (s->ctx->client_hello_cb(s, &al, s->ctx->client_hello_cb_arg)) {
1624 case SSL_CLIENT_HELLO_SUCCESS:
1625 break;
1626 case SSL_CLIENT_HELLO_RETRY:
1627 s->rwstate = SSL_CLIENT_HELLO_CB;
1628 return -1;
1629 case SSL_CLIENT_HELLO_ERROR:
1630 default:
1631 SSLfatal(s, al,
1632 SSL_F_TLS_EARLY_POST_PROCESS_CLIENT_HELLO,
1633 SSL_R_CALLBACK_FAILED);
1634 goto err;
1635 }
1636 }
1637
1638 /* Set up the client_random */
1639 memcpy(s->s3.client_random, clienthello->random, SSL3_RANDOM_SIZE);
1640
1641 /* Choose the version */
1642
1643 if (clienthello->isv2) {
1644 if (clienthello->legacy_version == SSL2_VERSION
1645 || (clienthello->legacy_version & 0xff00)
1646 != (SSL3_VERSION_MAJOR << 8)) {
1647 /*
1648 * This is real SSLv2 or something completely unknown. We don't
1649 * support it.
1650 */
1651 SSLfatal(s, SSL_AD_PROTOCOL_VERSION,
1652 SSL_F_TLS_EARLY_POST_PROCESS_CLIENT_HELLO,
1653 SSL_R_UNKNOWN_PROTOCOL);
1654 goto err;
1655 }
1656 /* SSLv3/TLS */
1657 s->client_version = clienthello->legacy_version;
1658 }
1659 /*
1660 * Do SSL/TLS version negotiation if applicable. For DTLS we just check
1661 * versions are potentially compatible. Version negotiation comes later.
1662 */
1663 if (!SSL_IS_DTLS(s)) {
1664 protverr = ssl_choose_server_version(s, clienthello, &dgrd);
1665 } else if (s->method->version != DTLS_ANY_VERSION &&
1666 DTLS_VERSION_LT((int)clienthello->legacy_version, s->version)) {
1667 protverr = SSL_R_VERSION_TOO_LOW;
1668 } else {
1669 protverr = 0;
1670 }
1671
1672 if (protverr) {
1673 if (SSL_IS_FIRST_HANDSHAKE(s)) {
1674 /* like ssl3_get_record, send alert using remote version number */
1675 s->version = s->client_version = clienthello->legacy_version;
1676 }
1677 SSLfatal(s, SSL_AD_PROTOCOL_VERSION,
1678 SSL_F_TLS_EARLY_POST_PROCESS_CLIENT_HELLO, protverr);
1679 goto err;
1680 }
1681
1682 /* TLSv1.3 specifies that a ClientHello must end on a record boundary */
1683 if (SSL_IS_TLS13(s) && RECORD_LAYER_processed_read_pending(&s->rlayer)) {
1684 SSLfatal(s, SSL_AD_UNEXPECTED_MESSAGE,
1685 SSL_F_TLS_EARLY_POST_PROCESS_CLIENT_HELLO,
1686 SSL_R_NOT_ON_RECORD_BOUNDARY);
1687 goto err;
1688 }
1689
1690 if (SSL_IS_DTLS(s)) {
1691 /* Empty cookie was already handled above by returning early. */
1692 if (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) {
1693 if (s->ctx->app_verify_cookie_cb != NULL) {
1694 if (s->ctx->app_verify_cookie_cb(s, clienthello->dtls_cookie,
1695 clienthello->dtls_cookie_len) == 0) {
1696 SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE,
1697 SSL_F_TLS_EARLY_POST_PROCESS_CLIENT_HELLO,
1698 SSL_R_COOKIE_MISMATCH);
1699 goto err;
1700 /* else cookie verification succeeded */
1701 }
1702 /* default verification */
1703 } else if (s->d1->cookie_len != clienthello->dtls_cookie_len
1704 || memcmp(clienthello->dtls_cookie, s->d1->cookie,
1705 s->d1->cookie_len) != 0) {
1706 SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE,
1707 SSL_F_TLS_EARLY_POST_PROCESS_CLIENT_HELLO,
1708 SSL_R_COOKIE_MISMATCH);
1709 goto err;
1710 }
1711 s->d1->cookie_verified = 1;
1712 }
1713 if (s->method->version == DTLS_ANY_VERSION) {
1714 protverr = ssl_choose_server_version(s, clienthello, &dgrd);
1715 if (protverr != 0) {
1716 s->version = s->client_version;
1717 SSLfatal(s, SSL_AD_PROTOCOL_VERSION,
1718 SSL_F_TLS_EARLY_POST_PROCESS_CLIENT_HELLO, protverr);
1719 goto err;
1720 }
1721 }
1722 }
1723
1724 s->hit = 0;
1725
1726 if (!ssl_cache_cipherlist(s, &clienthello->ciphersuites,
1727 clienthello->isv2) ||
1728 !bytes_to_cipher_list(s, &clienthello->ciphersuites, &ciphers, &scsvs,
1729 clienthello->isv2, 1)) {
1730 /* SSLfatal() already called */
1731 goto err;
1732 }
1733
1734 s->s3.send_connection_binding = 0;
1735 /* Check what signalling cipher-suite values were received. */
1736 if (scsvs != NULL) {
1737 for(i = 0; i < sk_SSL_CIPHER_num(scsvs); i++) {
1738 c = sk_SSL_CIPHER_value(scsvs, i);
1739 if (SSL_CIPHER_get_id(c) == SSL3_CK_SCSV) {
1740 if (s->renegotiate) {
1741 /* SCSV is fatal if renegotiating */
1742 SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE,
1743 SSL_F_TLS_EARLY_POST_PROCESS_CLIENT_HELLO,
1744 SSL_R_SCSV_RECEIVED_WHEN_RENEGOTIATING);
1745 goto err;
1746 }
1747 s->s3.send_connection_binding = 1;
1748 } else if (SSL_CIPHER_get_id(c) == SSL3_CK_FALLBACK_SCSV &&
1749 !ssl_check_version_downgrade(s)) {
1750 /*
1751 * This SCSV indicates that the client previously tried
1752 * a higher version. We should fail if the current version
1753 * is an unexpected downgrade, as that indicates that the first
1754 * connection may have been tampered with in order to trigger
1755 * an insecure downgrade.
1756 */
1757 SSLfatal(s, SSL_AD_INAPPROPRIATE_FALLBACK,
1758 SSL_F_TLS_EARLY_POST_PROCESS_CLIENT_HELLO,
1759 SSL_R_INAPPROPRIATE_FALLBACK);
1760 goto err;
1761 }
1762 }
1763 }
1764
1765 /* For TLSv1.3 we must select the ciphersuite *before* session resumption */
1766 if (SSL_IS_TLS13(s)) {
1767 const SSL_CIPHER *cipher =
1768 ssl3_choose_cipher(s, ciphers, SSL_get_ciphers(s));
1769
1770 if (cipher == NULL) {
1771 SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE,
1772 SSL_F_TLS_EARLY_POST_PROCESS_CLIENT_HELLO,
1773 SSL_R_NO_SHARED_CIPHER);
1774 goto err;
1775 }
1776 if (s->hello_retry_request == SSL_HRR_PENDING
1777 && (s->s3.tmp.new_cipher == NULL
1778 || s->s3.tmp.new_cipher->id != cipher->id)) {
1779 /*
1780 * A previous HRR picked a different ciphersuite to the one we
1781 * just selected. Something must have changed.
1782 */
1783 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER,
1784 SSL_F_TLS_EARLY_POST_PROCESS_CLIENT_HELLO,
1785 SSL_R_BAD_CIPHER);
1786 goto err;
1787 }
1788 s->s3.tmp.new_cipher = cipher;
1789 }
1790
1791 /* We need to do this before getting the session */
1792 if (!tls_parse_extension(s, TLSEXT_IDX_extended_master_secret,
1793 SSL_EXT_CLIENT_HELLO,
1794 clienthello->pre_proc_exts, NULL, 0)) {
1795 /* SSLfatal() already called */
1796 goto err;
1797 }
1798
1799 /*
1800 * We don't allow resumption in a backwards compatible ClientHello.
1801 * TODO(openssl-team): in TLS1.1+, session_id MUST be empty.
1802 *
1803 * Versions before 0.9.7 always allow clients to resume sessions in
1804 * renegotiation. 0.9.7 and later allow this by default, but optionally
1805 * ignore resumption requests with flag
1806 * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION (it's a new flag rather
1807 * than a change to default behavior so that applications relying on
1808 * this for security won't even compile against older library versions).
1809 * 1.0.1 and later also have a function SSL_renegotiate_abbreviated() to
1810 * request renegotiation but not a new session (s->new_session remains
1811 * unset): for servers, this essentially just means that the
1812 * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION setting will be
1813 * ignored.
1814 */
1815 if (clienthello->isv2 ||
1816 (s->new_session &&
1817 (s->options & SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION))) {
1818 if (!ssl_get_new_session(s, 1)) {
1819 /* SSLfatal() already called */
1820 goto err;
1821 }
1822 } else {
1823 i = ssl_get_prev_session(s, clienthello);
1824 if (i == 1) {
1825 /* previous session */
1826 s->hit = 1;
1827 } else if (i == -1) {
1828 /* SSLfatal() already called */
1829 goto err;
1830 } else {
1831 /* i == 0 */
1832 if (!ssl_get_new_session(s, 1)) {
1833 /* SSLfatal() already called */
1834 goto err;
1835 }
1836 }
1837 }
1838
1839 if (SSL_IS_TLS13(s)) {
1840 memcpy(s->tmp_session_id, s->clienthello->session_id,
1841 s->clienthello->session_id_len);
1842 s->tmp_session_id_len = s->clienthello->session_id_len;
1843 }
1844
1845 /*
1846 * If it is a hit, check that the cipher is in the list. In TLSv1.3 we check
1847 * ciphersuite compatibility with the session as part of resumption.
1848 */
1849 if (!SSL_IS_TLS13(s) && s->hit) {
1850 j = 0;
1851 id = s->session->cipher->id;
1852
1853 OSSL_TRACE_BEGIN(TLS_CIPHER) {
1854 BIO_printf(trc_out, "client sent %d ciphers\n",
1855 sk_SSL_CIPHER_num(ciphers));
1856 }
1857 for (i = 0; i < sk_SSL_CIPHER_num(ciphers); i++) {
1858 c = sk_SSL_CIPHER_value(ciphers, i);
1859 if (trc_out != NULL)
1860 BIO_printf(trc_out, "client [%2d of %2d]:%s\n", i,
1861 sk_SSL_CIPHER_num(ciphers), SSL_CIPHER_get_name(c));
1862 if (c->id == id) {
1863 j = 1;
1864 break;
1865 }
1866 }
1867 if (j == 0) {
1868 /*
1869 * we need to have the cipher in the cipher list if we are asked
1870 * to reuse it
1871 */
1872 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER,
1873 SSL_F_TLS_EARLY_POST_PROCESS_CLIENT_HELLO,
1874 SSL_R_REQUIRED_CIPHER_MISSING);
1875 OSSL_TRACE_CANCEL(TLS_CIPHER);
1876 goto err;
1877 }
1878 OSSL_TRACE_END(TLS_CIPHER);
1879 }
1880
1881 for (loop = 0; loop < clienthello->compressions_len; loop++) {
1882 if (clienthello->compressions[loop] == 0)
1883 break;
1884 }
1885
1886 if (loop >= clienthello->compressions_len) {
1887 /* no compress */
1888 SSLfatal(s, SSL_AD_DECODE_ERROR,
1889 SSL_F_TLS_EARLY_POST_PROCESS_CLIENT_HELLO,
1890 SSL_R_NO_COMPRESSION_SPECIFIED);
1891 goto err;
1892 }
1893
1894#ifndef OPENSSL_NO_EC
1895 if (s->options & SSL_OP_SAFARI_ECDHE_ECDSA_BUG)
1896 ssl_check_for_safari(s, clienthello);
1897#endif /* !OPENSSL_NO_EC */
1898
1899 /* TLS extensions */
1900 if (!tls_parse_all_extensions(s, SSL_EXT_CLIENT_HELLO,
1901 clienthello->pre_proc_exts, NULL, 0, 1)) {
1902 /* SSLfatal() already called */
1903 goto err;
1904 }
1905
1906 /*
1907 * Check if we want to use external pre-shared secret for this handshake
1908 * for not reused session only. We need to generate server_random before
1909 * calling tls_session_secret_cb in order to allow SessionTicket
1910 * processing to use it in key derivation.
1911 */
1912 {
1913 unsigned char *pos;
1914 pos = s->s3.server_random;
1915 if (ssl_fill_hello_random(s, 1, pos, SSL3_RANDOM_SIZE, dgrd) <= 0) {
1916 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
1917 SSL_F_TLS_EARLY_POST_PROCESS_CLIENT_HELLO,
1918 ERR_R_INTERNAL_ERROR);
1919 goto err;
1920 }
1921 }
1922
1923 if (!s->hit
1924 && s->version >= TLS1_VERSION
1925 && !SSL_IS_TLS13(s)
1926 && !SSL_IS_DTLS(s)
1927 && s->ext.session_secret_cb) {
1928 const SSL_CIPHER *pref_cipher = NULL;
1929 /*
1930 * s->session->master_key_length is a size_t, but this is an int for
1931 * backwards compat reasons
1932 */
1933 int master_key_length;
1934
1935 master_key_length = sizeof(s->session->master_key);
1936 if (s->ext.session_secret_cb(s, s->session->master_key,
1937 &master_key_length, ciphers,
1938 &pref_cipher,
1939 s->ext.session_secret_cb_arg)
1940 && master_key_length > 0) {
1941 s->session->master_key_length = master_key_length;
1942 s->hit = 1;
1943 s->peer_ciphers = ciphers;
1944 s->session->verify_result = X509_V_OK;
1945
1946 ciphers = NULL;
1947
1948 /* check if some cipher was preferred by call back */
1949 if (pref_cipher == NULL)
1950 pref_cipher = ssl3_choose_cipher(s, s->peer_ciphers,
1951 SSL_get_ciphers(s));
1952 if (pref_cipher == NULL) {
1953 SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE,
1954 SSL_F_TLS_EARLY_POST_PROCESS_CLIENT_HELLO,
1955 SSL_R_NO_SHARED_CIPHER);
1956 goto err;
1957 }
1958
1959 s->session->cipher = pref_cipher;
1960 sk_SSL_CIPHER_free(s->cipher_list);
1961 s->cipher_list = sk_SSL_CIPHER_dup(s->peer_ciphers);
1962 sk_SSL_CIPHER_free(s->cipher_list_by_id);
1963 s->cipher_list_by_id = sk_SSL_CIPHER_dup(s->peer_ciphers);
1964 }
1965 }
1966
1967 /*
1968 * Worst case, we will use the NULL compression, but if we have other
1969 * options, we will now look for them. We have complen-1 compression
1970 * algorithms from the client, starting at q.
1971 */
1972 s->s3.tmp.new_compression = NULL;
1973 if (SSL_IS_TLS13(s)) {
1974 /*
1975 * We already checked above that the NULL compression method appears in
1976 * the list. Now we check there aren't any others (which is illegal in
1977 * a TLSv1.3 ClientHello.
1978 */
1979 if (clienthello->compressions_len != 1) {
1980 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER,
1981 SSL_F_TLS_EARLY_POST_PROCESS_CLIENT_HELLO,
1982 SSL_R_INVALID_COMPRESSION_ALGORITHM);
1983 goto err;
1984 }
1985 }
1986#ifndef OPENSSL_NO_COMP
1987 /* This only happens if we have a cache hit */
1988 else if (s->session->compress_meth != 0) {
1989 int m, comp_id = s->session->compress_meth;
1990 unsigned int k;
1991 /* Perform sanity checks on resumed compression algorithm */
1992 /* Can't disable compression */
1993 if (!ssl_allow_compression(s)) {
1994 SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE,
1995 SSL_F_TLS_EARLY_POST_PROCESS_CLIENT_HELLO,
1996 SSL_R_INCONSISTENT_COMPRESSION);
1997 goto err;
1998 }
1999 /* Look for resumed compression method */
2000 for (m = 0; m < sk_SSL_COMP_num(s->ctx->comp_methods); m++) {
2001 comp = sk_SSL_COMP_value(s->ctx->comp_methods, m);
2002 if (comp_id == comp->id) {
2003 s->s3.tmp.new_compression = comp;
2004 break;
2005 }
2006 }
2007 if (s->s3.tmp.new_compression == NULL) {
2008 SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE,
2009 SSL_F_TLS_EARLY_POST_PROCESS_CLIENT_HELLO,
2010 SSL_R_INVALID_COMPRESSION_ALGORITHM);
2011 goto err;
2012 }
2013 /* Look for resumed method in compression list */
2014 for (k = 0; k < clienthello->compressions_len; k++) {
2015 if (clienthello->compressions[k] == comp_id)
2016 break;
2017 }
2018 if (k >= clienthello->compressions_len) {
2019 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER,
2020 SSL_F_TLS_EARLY_POST_PROCESS_CLIENT_HELLO,
2021 SSL_R_REQUIRED_COMPRESSION_ALGORITHM_MISSING);
2022 goto err;
2023 }
2024 } else if (s->hit) {
2025 comp = NULL;
2026 } else if (ssl_allow_compression(s) && s->ctx->comp_methods) {
2027 /* See if we have a match */
2028 int m, nn, v, done = 0;
2029 unsigned int o;
2030
2031 nn = sk_SSL_COMP_num(s->ctx->comp_methods);
2032 for (m = 0; m < nn; m++) {
2033 comp = sk_SSL_COMP_value(s->ctx->comp_methods, m);
2034 v = comp->id;
2035 for (o = 0; o < clienthello->compressions_len; o++) {
2036 if (v == clienthello->compressions[o]) {
2037 done = 1;
2038 break;
2039 }
2040 }
2041 if (done)
2042 break;
2043 }
2044 if (done)
2045 s->s3.tmp.new_compression = comp;
2046 else
2047 comp = NULL;
2048 }
2049#else
2050 /*
2051 * If compression is disabled we'd better not try to resume a session
2052 * using compression.
2053 */
2054 if (s->session->compress_meth != 0) {
2055 SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE,
2056 SSL_F_TLS_EARLY_POST_PROCESS_CLIENT_HELLO,
2057 SSL_R_INCONSISTENT_COMPRESSION);
2058 goto err;
2059 }
2060#endif
2061
2062 /*
2063 * Given s->peer_ciphers and SSL_get_ciphers, we must pick a cipher
2064 */
2065
2066 if (!s->hit || SSL_IS_TLS13(s)) {
2067 sk_SSL_CIPHER_free(s->peer_ciphers);
2068 s->peer_ciphers = ciphers;
2069 if (ciphers == NULL) {
2070 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
2071 SSL_F_TLS_EARLY_POST_PROCESS_CLIENT_HELLO,
2072 ERR_R_INTERNAL_ERROR);
2073 goto err;
2074 }
2075 ciphers = NULL;
2076 }
2077
2078 if (!s->hit) {
2079#ifdef OPENSSL_NO_COMP
2080 s->session->compress_meth = 0;
2081#else
2082 s->session->compress_meth = (comp == NULL) ? 0 : comp->id;
2083#endif
2084 if (!tls1_set_server_sigalgs(s)) {
2085 /* SSLfatal() already called */
2086 goto err;
2087 }
2088 }
2089
2090 sk_SSL_CIPHER_free(ciphers);
2091 sk_SSL_CIPHER_free(scsvs);
2092 OPENSSL_free(clienthello->pre_proc_exts);
2093 OPENSSL_free(s->clienthello);
2094 s->clienthello = NULL;
2095 return 1;
2096 err:
2097 sk_SSL_CIPHER_free(ciphers);
2098 sk_SSL_CIPHER_free(scsvs);
2099 OPENSSL_free(clienthello->pre_proc_exts);
2100 OPENSSL_free(s->clienthello);
2101 s->clienthello = NULL;
2102
2103 return 0;
2104}
2105
2106/*
2107 * Call the status request callback if needed. Upon success, returns 1.
2108 * Upon failure, returns 0.
2109 */
2110static int tls_handle_status_request(SSL *s)
2111{
2112 s->ext.status_expected = 0;
2113
2114 /*
2115 * If status request then ask callback what to do. Note: this must be
2116 * called after servername callbacks in case the certificate has changed,
2117 * and must be called after the cipher has been chosen because this may
2118 * influence which certificate is sent
2119 */
2120 if (s->ext.status_type != TLSEXT_STATUSTYPE_nothing && s->ctx != NULL
2121 && s->ctx->ext.status_cb != NULL) {
2122 int ret;
2123
2124 /* If no certificate can't return certificate status */
2125 if (s->s3.tmp.cert != NULL) {
2126 /*
2127 * Set current certificate to one we will use so SSL_get_certificate
2128 * et al can pick it up.
2129 */
2130 s->cert->key = s->s3.tmp.cert;
2131 ret = s->ctx->ext.status_cb(s, s->ctx->ext.status_arg);
2132 switch (ret) {
2133 /* We don't want to send a status request response */
2134 case SSL_TLSEXT_ERR_NOACK:
2135 s->ext.status_expected = 0;
2136 break;
2137 /* status request response should be sent */
2138 case SSL_TLSEXT_ERR_OK:
2139 if (s->ext.ocsp.resp)
2140 s->ext.status_expected = 1;
2141 break;
2142 /* something bad happened */
2143 case SSL_TLSEXT_ERR_ALERT_FATAL:
2144 default:
2145 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
2146 SSL_F_TLS_HANDLE_STATUS_REQUEST,
2147 SSL_R_CLIENTHELLO_TLSEXT);
2148 return 0;
2149 }
2150 }
2151 }
2152
2153 return 1;
2154}
2155
2156/*
2157 * Call the alpn_select callback if needed. Upon success, returns 1.
2158 * Upon failure, returns 0.
2159 */
2160int tls_handle_alpn(SSL *s)
2161{
2162 const unsigned char *selected = NULL;
2163 unsigned char selected_len = 0;
2164
2165 if (s->ctx->ext.alpn_select_cb != NULL && s->s3.alpn_proposed != NULL) {
2166 int r = s->ctx->ext.alpn_select_cb(s, &selected, &selected_len,
2167 s->s3.alpn_proposed,
2168 (unsigned int)s->s3.alpn_proposed_len,
2169 s->ctx->ext.alpn_select_cb_arg);
2170
2171 if (r == SSL_TLSEXT_ERR_OK) {
2172 OPENSSL_free(s->s3.alpn_selected);
2173 s->s3.alpn_selected = OPENSSL_memdup(selected, selected_len);
2174 if (s->s3.alpn_selected == NULL) {
2175 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_HANDLE_ALPN,
2176 ERR_R_INTERNAL_ERROR);
2177 return 0;
2178 }
2179 s->s3.alpn_selected_len = selected_len;
2180#ifndef OPENSSL_NO_NEXTPROTONEG
2181 /* ALPN takes precedence over NPN. */
2182 s->s3.npn_seen = 0;
2183#endif
2184
2185 /* Check ALPN is consistent with session */
2186 if (s->session->ext.alpn_selected == NULL
2187 || selected_len != s->session->ext.alpn_selected_len
2188 || memcmp(selected, s->session->ext.alpn_selected,
2189 selected_len) != 0) {
2190 /* Not consistent so can't be used for early_data */
2191 s->ext.early_data_ok = 0;
2192
2193 if (!s->hit) {
2194 /*
2195 * This is a new session and so alpn_selected should have
2196 * been initialised to NULL. We should update it with the
2197 * selected ALPN.
2198 */
2199 if (!ossl_assert(s->session->ext.alpn_selected == NULL)) {
2200 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
2201 SSL_F_TLS_HANDLE_ALPN,
2202 ERR_R_INTERNAL_ERROR);
2203 return 0;
2204 }
2205 s->session->ext.alpn_selected = OPENSSL_memdup(selected,
2206 selected_len);
2207 if (s->session->ext.alpn_selected == NULL) {
2208 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
2209 SSL_F_TLS_HANDLE_ALPN,
2210 ERR_R_INTERNAL_ERROR);
2211 return 0;
2212 }
2213 s->session->ext.alpn_selected_len = selected_len;
2214 }
2215 }
2216
2217 return 1;
2218 } else if (r != SSL_TLSEXT_ERR_NOACK) {
2219 SSLfatal(s, SSL_AD_NO_APPLICATION_PROTOCOL, SSL_F_TLS_HANDLE_ALPN,
2220 SSL_R_NO_APPLICATION_PROTOCOL);
2221 return 0;
2222 }
2223 /*
2224 * If r == SSL_TLSEXT_ERR_NOACK then behave as if no callback was
2225 * present.
2226 */
2227 }
2228
2229 /* Check ALPN is consistent with session */
2230 if (s->session->ext.alpn_selected != NULL) {
2231 /* Not consistent so can't be used for early_data */
2232 s->ext.early_data_ok = 0;
2233 }
2234
2235 return 1;
2236}
2237
2238WORK_STATE tls_post_process_client_hello(SSL *s, WORK_STATE wst)
2239{
2240 const SSL_CIPHER *cipher;
2241
2242 if (wst == WORK_MORE_A) {
2243 int rv = tls_early_post_process_client_hello(s);
2244 if (rv == 0) {
2245 /* SSLfatal() was already called */
2246 goto err;
2247 }
2248 if (rv < 0)
2249 return WORK_MORE_A;
2250 wst = WORK_MORE_B;
2251 }
2252 if (wst == WORK_MORE_B) {
2253 if (!s->hit || SSL_IS_TLS13(s)) {
2254 /* Let cert callback update server certificates if required */
2255 if (!s->hit && s->cert->cert_cb != NULL) {
2256 int rv = s->cert->cert_cb(s, s->cert->cert_cb_arg);
2257 if (rv == 0) {
2258 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
2259 SSL_F_TLS_POST_PROCESS_CLIENT_HELLO,
2260 SSL_R_CERT_CB_ERROR);
2261 goto err;
2262 }
2263 if (rv < 0) {
2264 s->rwstate = SSL_X509_LOOKUP;
2265 return WORK_MORE_B;
2266 }
2267 s->rwstate = SSL_NOTHING;
2268 }
2269
2270 /* In TLSv1.3 we selected the ciphersuite before resumption */
2271 if (!SSL_IS_TLS13(s)) {
2272 cipher =
2273 ssl3_choose_cipher(s, s->peer_ciphers, SSL_get_ciphers(s));
2274
2275 if (cipher == NULL) {
2276 SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE,
2277 SSL_F_TLS_POST_PROCESS_CLIENT_HELLO,
2278 SSL_R_NO_SHARED_CIPHER);
2279 goto err;
2280 }
2281 s->s3.tmp.new_cipher = cipher;
2282 }
2283 if (!s->hit) {
2284 if (!tls_choose_sigalg(s, 1)) {
2285 /* SSLfatal already called */
2286 goto err;
2287 }
2288 /* check whether we should disable session resumption */
2289 if (s->not_resumable_session_cb != NULL)
2290 s->session->not_resumable =
2291 s->not_resumable_session_cb(s,
2292 ((s->s3.tmp.new_cipher->algorithm_mkey
2293 & (SSL_kDHE | SSL_kECDHE)) != 0));
2294 if (s->session->not_resumable)
2295 /* do not send a session ticket */
2296 s->ext.ticket_expected = 0;
2297 }
2298 } else {
2299 /* Session-id reuse */
2300 s->s3.tmp.new_cipher = s->session->cipher;
2301 }
2302
2303 /*-
2304 * we now have the following setup.
2305 * client_random
2306 * cipher_list - our preferred list of ciphers
2307 * ciphers - the clients preferred list of ciphers
2308 * compression - basically ignored right now
2309 * ssl version is set - sslv3
2310 * s->session - The ssl session has been setup.
2311 * s->hit - session reuse flag
2312 * s->s3.tmp.new_cipher - the new cipher to use.
2313 */
2314
2315 /*
2316 * Call status_request callback if needed. Has to be done after the
2317 * certificate callbacks etc above.
2318 */
2319 if (!tls_handle_status_request(s)) {
2320 /* SSLfatal() already called */
2321 goto err;
2322 }
2323 /*
2324 * Call alpn_select callback if needed. Has to be done after SNI and
2325 * cipher negotiation (HTTP/2 restricts permitted ciphers). In TLSv1.3
2326 * we already did this because cipher negotiation happens earlier, and
2327 * we must handle ALPN before we decide whether to accept early_data.
2328 */
2329 if (!SSL_IS_TLS13(s) && !tls_handle_alpn(s)) {
2330 /* SSLfatal() already called */
2331 goto err;
2332 }
2333
2334 wst = WORK_MORE_C;
2335 }
2336#ifndef OPENSSL_NO_SRP
2337 if (wst == WORK_MORE_C) {
2338 int ret;
2339 if ((ret = ssl_check_srp_ext_ClientHello(s)) == 0) {
2340 /*
2341 * callback indicates further work to be done
2342 */
2343 s->rwstate = SSL_X509_LOOKUP;
2344 return WORK_MORE_C;
2345 }
2346 if (ret < 0) {
2347 /* SSLfatal() already called */
2348 goto err;
2349 }
2350 }
2351#endif
2352
2353 return WORK_FINISHED_STOP;
2354 err:
2355 return WORK_ERROR;
2356}
2357
2358int tls_construct_server_hello(SSL *s, WPACKET *pkt)
2359{
2360 int compm;
2361 size_t sl, len;
2362 int version;
2363 unsigned char *session_id;
2364 int usetls13 = SSL_IS_TLS13(s) || s->hello_retry_request == SSL_HRR_PENDING;
2365
2366 version = usetls13 ? TLS1_2_VERSION : s->version;
2367 if (!WPACKET_put_bytes_u16(pkt, version)
2368 /*
2369 * Random stuff. Filling of the server_random takes place in
2370 * tls_process_client_hello()
2371 */
2372 || !WPACKET_memcpy(pkt,
2373 s->hello_retry_request == SSL_HRR_PENDING
2374 ? hrrrandom : s->s3.server_random,
2375 SSL3_RANDOM_SIZE)) {
2376 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_SERVER_HELLO,
2377 ERR_R_INTERNAL_ERROR);
2378 return 0;
2379 }
2380
2381 /*-
2382 * There are several cases for the session ID to send
2383 * back in the server hello:
2384 * - For session reuse from the session cache,
2385 * we send back the old session ID.
2386 * - If stateless session reuse (using a session ticket)
2387 * is successful, we send back the client's "session ID"
2388 * (which doesn't actually identify the session).
2389 * - If it is a new session, we send back the new
2390 * session ID.
2391 * - However, if we want the new session to be single-use,
2392 * we send back a 0-length session ID.
2393 * - In TLSv1.3 we echo back the session id sent to us by the client
2394 * regardless
2395 * s->hit is non-zero in either case of session reuse,
2396 * so the following won't overwrite an ID that we're supposed
2397 * to send back.
2398 */
2399 if (s->session->not_resumable ||
2400 (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER)
2401 && !s->hit))
2402 s->session->session_id_length = 0;
2403
2404 if (usetls13) {
2405 sl = s->tmp_session_id_len;
2406 session_id = s->tmp_session_id;
2407 } else {
2408 sl = s->session->session_id_length;
2409 session_id = s->session->session_id;
2410 }
2411
2412 if (sl > sizeof(s->session->session_id)) {
2413 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_SERVER_HELLO,
2414 ERR_R_INTERNAL_ERROR);
2415 return 0;
2416 }
2417
2418 /* set up the compression method */
2419#ifdef OPENSSL_NO_COMP
2420 compm = 0;
2421#else
2422 if (usetls13 || s->s3.tmp.new_compression == NULL)
2423 compm = 0;
2424 else
2425 compm = s->s3.tmp.new_compression->id;
2426#endif
2427
2428 if (!WPACKET_sub_memcpy_u8(pkt, session_id, sl)
2429 || !s->method->put_cipher_by_char(s->s3.tmp.new_cipher, pkt, &len)
2430 || !WPACKET_put_bytes_u8(pkt, compm)) {
2431 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_SERVER_HELLO,
2432 ERR_R_INTERNAL_ERROR);
2433 return 0;
2434 }
2435
2436 if (!tls_construct_extensions(s, pkt,
2437 s->hello_retry_request == SSL_HRR_PENDING
2438 ? SSL_EXT_TLS1_3_HELLO_RETRY_REQUEST
2439 : (SSL_IS_TLS13(s)
2440 ? SSL_EXT_TLS1_3_SERVER_HELLO
2441 : SSL_EXT_TLS1_2_SERVER_HELLO),
2442 NULL, 0)) {
2443 /* SSLfatal() already called */
2444 return 0;
2445 }
2446
2447 if (s->hello_retry_request == SSL_HRR_PENDING) {
2448 /* Ditch the session. We'll create a new one next time around */
2449 SSL_SESSION_free(s->session);
2450 s->session = NULL;
2451 s->hit = 0;
2452
2453 /*
2454 * Re-initialise the Transcript Hash. We're going to prepopulate it with
2455 * a synthetic message_hash in place of ClientHello1.
2456 */
2457 if (!create_synthetic_message_hash(s, NULL, 0, NULL, 0)) {
2458 /* SSLfatal() already called */
2459 return 0;
2460 }
2461 } else if (!(s->verify_mode & SSL_VERIFY_PEER)
2462 && !ssl3_digest_cached_records(s, 0)) {
2463 /* SSLfatal() already called */;
2464 return 0;
2465 }
2466
2467 return 1;
2468}
2469
2470int tls_construct_server_done(SSL *s, WPACKET *pkt)
2471{
2472 if (!s->s3.tmp.cert_request) {
2473 if (!ssl3_digest_cached_records(s, 0)) {
2474 /* SSLfatal() already called */
2475 return 0;
2476 }
2477 }
2478 return 1;
2479}
2480
2481int tls_construct_server_key_exchange(SSL *s, WPACKET *pkt)
2482{
2483#ifndef OPENSSL_NO_DH
2484 EVP_PKEY *pkdh = NULL;
2485#endif
2486#ifndef OPENSSL_NO_EC
2487 unsigned char *encodedPoint = NULL;
2488 size_t encodedlen = 0;
2489 int curve_id = 0;
2490#endif
2491 const SIGALG_LOOKUP *lu = s->s3.tmp.sigalg;
2492 int i;
2493 unsigned long type;
2494 const BIGNUM *r[4];
2495 EVP_MD_CTX *md_ctx = EVP_MD_CTX_new();
2496 EVP_PKEY_CTX *pctx = NULL;
2497 size_t paramlen, paramoffset;
2498
2499 if (!WPACKET_get_total_written(pkt, &paramoffset)) {
2500 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
2501 SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
2502 goto err;
2503 }
2504
2505 if (md_ctx == NULL) {
2506 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
2507 SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
2508 goto err;
2509 }
2510
2511 type = s->s3.tmp.new_cipher->algorithm_mkey;
2512
2513 r[0] = r[1] = r[2] = r[3] = NULL;
2514#ifndef OPENSSL_NO_PSK
2515 /* Plain PSK or RSAPSK nothing to do */
2516 if (type & (SSL_kPSK | SSL_kRSAPSK)) {
2517 } else
2518#endif /* !OPENSSL_NO_PSK */
2519#ifndef OPENSSL_NO_DH
2520 if (type & (SSL_kDHE | SSL_kDHEPSK)) {
2521 CERT *cert = s->cert;
2522
2523 EVP_PKEY *pkdhp = NULL;
2524 DH *dh;
2525
2526 if (s->cert->dh_tmp_auto) {
2527 DH *dhp = ssl_get_auto_dh(s);
2528 pkdh = EVP_PKEY_new();
2529 if (pkdh == NULL || dhp == NULL) {
2530 DH_free(dhp);
2531 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
2532 SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
2533 ERR_R_INTERNAL_ERROR);
2534 goto err;
2535 }
2536 EVP_PKEY_assign_DH(pkdh, dhp);
2537 pkdhp = pkdh;
2538 } else {
2539 pkdhp = cert->dh_tmp;
2540 }
2541 if ((pkdhp == NULL) && (s->cert->dh_tmp_cb != NULL)) {
2542 DH *dhp = s->cert->dh_tmp_cb(s, 0, 1024);
2543 pkdh = ssl_dh_to_pkey(dhp);
2544 if (pkdh == NULL) {
2545 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
2546 SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
2547 ERR_R_INTERNAL_ERROR);
2548 goto err;
2549 }
2550 pkdhp = pkdh;
2551 }
2552 if (pkdhp == NULL) {
2553 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
2554 SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
2555 SSL_R_MISSING_TMP_DH_KEY);
2556 goto err;
2557 }
2558 if (!ssl_security(s, SSL_SECOP_TMP_DH,
2559 EVP_PKEY_security_bits(pkdhp), 0, pkdhp)) {
2560 SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE,
2561 SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
2562 SSL_R_DH_KEY_TOO_SMALL);
2563 goto err;
2564 }
2565 if (s->s3.tmp.pkey != NULL) {
2566 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
2567 SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
2568 ERR_R_INTERNAL_ERROR);
2569 goto err;
2570 }
2571
2572 s->s3.tmp.pkey = ssl_generate_pkey(pkdhp);
2573 if (s->s3.tmp.pkey == NULL) {
2574 /* SSLfatal() already called */
2575 goto err;
2576 }
2577
2578 dh = EVP_PKEY_get0_DH(s->s3.tmp.pkey);
2579 if (dh == NULL) {
2580 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
2581 SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
2582 ERR_R_INTERNAL_ERROR);
2583 goto err;
2584 }
2585
2586 EVP_PKEY_free(pkdh);
2587 pkdh = NULL;
2588
2589 DH_get0_pqg(dh, &r[0], NULL, &r[1]);
2590 DH_get0_key(dh, &r[2], NULL);
2591 } else
2592#endif
2593#ifndef OPENSSL_NO_EC
2594 if (type & (SSL_kECDHE | SSL_kECDHEPSK)) {
2595
2596 if (s->s3.tmp.pkey != NULL) {
2597 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
2598 SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
2599 ERR_R_INTERNAL_ERROR);
2600 goto err;
2601 }
2602
2603 /* Get NID of appropriate shared curve */
2604 curve_id = tls1_shared_group(s, -2);
2605 if (curve_id == 0) {
2606 SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE,
2607 SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
2608 SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
2609 goto err;
2610 }
2611 s->s3.tmp.pkey = ssl_generate_pkey_group(s, curve_id);
2612 /* Generate a new key for this curve */
2613 if (s->s3.tmp.pkey == NULL) {
2614 /* SSLfatal() already called */
2615 goto err;
2616 }
2617
2618 /* Encode the public key. */
2619 encodedlen = EVP_PKEY_get1_tls_encodedpoint(s->s3.tmp.pkey,
2620 &encodedPoint);
2621 if (encodedlen == 0) {
2622 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
2623 SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_R_EC_LIB);
2624 goto err;
2625 }
2626
2627 /*
2628 * We'll generate the serverKeyExchange message explicitly so we
2629 * can set these to NULLs
2630 */
2631 r[0] = NULL;
2632 r[1] = NULL;
2633 r[2] = NULL;
2634 r[3] = NULL;
2635 } else
2636#endif /* !OPENSSL_NO_EC */
2637#ifndef OPENSSL_NO_SRP
2638 if (type & SSL_kSRP) {
2639 if ((s->srp_ctx.N == NULL) ||
2640 (s->srp_ctx.g == NULL) ||
2641 (s->srp_ctx.s == NULL) || (s->srp_ctx.B == NULL)) {
2642 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
2643 SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
2644 SSL_R_MISSING_SRP_PARAM);
2645 goto err;
2646 }
2647 r[0] = s->srp_ctx.N;
2648 r[1] = s->srp_ctx.g;
2649 r[2] = s->srp_ctx.s;
2650 r[3] = s->srp_ctx.B;
2651 } else
2652#endif
2653 {
2654 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
2655 SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
2656 SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
2657 goto err;
2658 }
2659
2660 if (((s->s3.tmp.new_cipher->algorithm_auth & (SSL_aNULL | SSL_aSRP)) != 0)
2661 || ((s->s3.tmp.new_cipher->algorithm_mkey & SSL_PSK)) != 0) {
2662 lu = NULL;
2663 } else if (lu == NULL) {
2664 SSLfatal(s, SSL_AD_DECODE_ERROR,
2665 SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
2666 goto err;
2667 }
2668
2669#ifndef OPENSSL_NO_PSK
2670 if (type & SSL_PSK) {
2671 size_t len = (s->cert->psk_identity_hint == NULL)
2672 ? 0 : strlen(s->cert->psk_identity_hint);
2673
2674 /*
2675 * It should not happen that len > PSK_MAX_IDENTITY_LEN - we already
2676 * checked this when we set the identity hint - but just in case
2677 */
2678 if (len > PSK_MAX_IDENTITY_LEN
2679 || !WPACKET_sub_memcpy_u16(pkt, s->cert->psk_identity_hint,
2680 len)) {
2681 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
2682 SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
2683 ERR_R_INTERNAL_ERROR);
2684 goto err;
2685 }
2686 }
2687#endif
2688
2689 for (i = 0; i < 4 && r[i] != NULL; i++) {
2690 unsigned char *binval;
2691 int res;
2692
2693#ifndef OPENSSL_NO_SRP
2694 if ((i == 2) && (type & SSL_kSRP)) {
2695 res = WPACKET_start_sub_packet_u8(pkt);
2696 } else
2697#endif
2698 res = WPACKET_start_sub_packet_u16(pkt);
2699
2700 if (!res) {
2701 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
2702 SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
2703 ERR_R_INTERNAL_ERROR);
2704 goto err;
2705 }
2706
2707#ifndef OPENSSL_NO_DH
2708 /*-
2709 * for interoperability with some versions of the Microsoft TLS
2710 * stack, we need to zero pad the DHE pub key to the same length
2711 * as the prime
2712 */
2713 if ((i == 2) && (type & (SSL_kDHE | SSL_kDHEPSK))) {
2714 size_t len = BN_num_bytes(r[0]) - BN_num_bytes(r[2]);
2715
2716 if (len > 0) {
2717 if (!WPACKET_allocate_bytes(pkt, len, &binval)) {
2718 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
2719 SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
2720 ERR_R_INTERNAL_ERROR);
2721 goto err;
2722 }
2723 memset(binval, 0, len);
2724 }
2725 }
2726#endif
2727 if (!WPACKET_allocate_bytes(pkt, BN_num_bytes(r[i]), &binval)
2728 || !WPACKET_close(pkt)) {
2729 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
2730 SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
2731 ERR_R_INTERNAL_ERROR);
2732 goto err;
2733 }
2734
2735 BN_bn2bin(r[i], binval);
2736 }
2737
2738#ifndef OPENSSL_NO_EC
2739 if (type & (SSL_kECDHE | SSL_kECDHEPSK)) {
2740 /*
2741 * We only support named (not generic) curves. In this situation, the
2742 * ServerKeyExchange message has: [1 byte CurveType], [2 byte CurveName]
2743 * [1 byte length of encoded point], followed by the actual encoded
2744 * point itself
2745 */
2746 if (!WPACKET_put_bytes_u8(pkt, NAMED_CURVE_TYPE)
2747 || !WPACKET_put_bytes_u8(pkt, 0)
2748 || !WPACKET_put_bytes_u8(pkt, curve_id)
2749 || !WPACKET_sub_memcpy_u8(pkt, encodedPoint, encodedlen)) {
2750 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
2751 SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
2752 ERR_R_INTERNAL_ERROR);
2753 goto err;
2754 }
2755 OPENSSL_free(encodedPoint);
2756 encodedPoint = NULL;
2757 }
2758#endif
2759
2760 /* not anonymous */
2761 if (lu != NULL) {
2762 EVP_PKEY *pkey = s->s3.tmp.cert->privatekey;
2763 const EVP_MD *md;
2764 unsigned char *sigbytes1, *sigbytes2, *tbs;
2765 size_t siglen, tbslen;
2766 int rv;
2767
2768 if (pkey == NULL || !tls1_lookup_md(lu, &md)) {
2769 /* Should never happen */
2770 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
2771 SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
2772 ERR_R_INTERNAL_ERROR);
2773 goto err;
2774 }
2775 /* Get length of the parameters we have written above */
2776 if (!WPACKET_get_length(pkt, &paramlen)) {
2777 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
2778 SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
2779 ERR_R_INTERNAL_ERROR);
2780 goto err;
2781 }
2782 /* send signature algorithm */
2783 if (SSL_USE_SIGALGS(s) && !WPACKET_put_bytes_u16(pkt, lu->sigalg)) {
2784 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
2785 SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
2786 ERR_R_INTERNAL_ERROR);
2787 goto err;
2788 }
2789 /*
2790 * Create the signature. We don't know the actual length of the sig
2791 * until after we've created it, so we reserve enough bytes for it
2792 * up front, and then properly allocate them in the WPACKET
2793 * afterwards.
2794 */
2795 siglen = EVP_PKEY_size(pkey);
2796 if (!WPACKET_sub_reserve_bytes_u16(pkt, siglen, &sigbytes1)
2797 || EVP_DigestSignInit(md_ctx, &pctx, md, NULL, pkey) <= 0) {
2798 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
2799 SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
2800 ERR_R_INTERNAL_ERROR);
2801 goto err;
2802 }
2803 if (lu->sig == EVP_PKEY_RSA_PSS) {
2804 if (EVP_PKEY_CTX_set_rsa_padding(pctx, RSA_PKCS1_PSS_PADDING) <= 0
2805 || EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx, RSA_PSS_SALTLEN_DIGEST) <= 0) {
2806 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
2807 SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
2808 ERR_R_EVP_LIB);
2809 goto err;
2810 }
2811 }
2812 tbslen = construct_key_exchange_tbs(s, &tbs,
2813 s->init_buf->data + paramoffset,
2814 paramlen);
2815 if (tbslen == 0) {
2816 /* SSLfatal() already called */
2817 goto err;
2818 }
2819 rv = EVP_DigestSign(md_ctx, sigbytes1, &siglen, tbs, tbslen);
2820 OPENSSL_free(tbs);
2821 if (rv <= 0 || !WPACKET_sub_allocate_bytes_u16(pkt, siglen, &sigbytes2)
2822 || sigbytes1 != sigbytes2) {
2823 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
2824 SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
2825 ERR_R_INTERNAL_ERROR);
2826 goto err;
2827 }
2828 }
2829
2830 EVP_MD_CTX_free(md_ctx);
2831 return 1;
2832 err:
2833#ifndef OPENSSL_NO_DH
2834 EVP_PKEY_free(pkdh);
2835#endif
2836#ifndef OPENSSL_NO_EC
2837 OPENSSL_free(encodedPoint);
2838#endif
2839 EVP_MD_CTX_free(md_ctx);
2840 return 0;
2841}
2842
2843int tls_construct_certificate_request(SSL *s, WPACKET *pkt)
2844{
2845 if (SSL_IS_TLS13(s)) {
2846 /* Send random context when doing post-handshake auth */
2847 if (s->post_handshake_auth == SSL_PHA_REQUEST_PENDING) {
2848 OPENSSL_free(s->pha_context);
2849 s->pha_context_len = 32;
2850 if ((s->pha_context = OPENSSL_malloc(s->pha_context_len)) == NULL
2851 || RAND_bytes(s->pha_context, s->pha_context_len) <= 0
2852 || !WPACKET_sub_memcpy_u8(pkt, s->pha_context, s->pha_context_len)) {
2853 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
2854 SSL_F_TLS_CONSTRUCT_CERTIFICATE_REQUEST,
2855 ERR_R_INTERNAL_ERROR);
2856 return 0;
2857 }
2858 /* reset the handshake hash back to just after the ClientFinished */
2859 if (!tls13_restore_handshake_digest_for_pha(s)) {
2860 /* SSLfatal() already called */
2861 return 0;
2862 }
2863 } else {
2864 if (!WPACKET_put_bytes_u8(pkt, 0)) {
2865 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
2866 SSL_F_TLS_CONSTRUCT_CERTIFICATE_REQUEST,
2867 ERR_R_INTERNAL_ERROR);
2868 return 0;
2869 }
2870 }
2871
2872 if (!tls_construct_extensions(s, pkt,
2873 SSL_EXT_TLS1_3_CERTIFICATE_REQUEST, NULL,
2874 0)) {
2875 /* SSLfatal() already called */
2876 return 0;
2877 }
2878 goto done;
2879 }
2880
2881 /* get the list of acceptable cert types */
2882 if (!WPACKET_start_sub_packet_u8(pkt)
2883 || !ssl3_get_req_cert_type(s, pkt) || !WPACKET_close(pkt)) {
2884 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
2885 SSL_F_TLS_CONSTRUCT_CERTIFICATE_REQUEST, ERR_R_INTERNAL_ERROR);
2886 return 0;
2887 }
2888
2889 if (SSL_USE_SIGALGS(s)) {
2890 const uint16_t *psigs;
2891 size_t nl = tls12_get_psigalgs(s, 1, &psigs);
2892
2893 if (!WPACKET_start_sub_packet_u16(pkt)
2894 || !WPACKET_set_flags(pkt, WPACKET_FLAGS_NON_ZERO_LENGTH)
2895 || !tls12_copy_sigalgs(s, pkt, psigs, nl)
2896 || !WPACKET_close(pkt)) {
2897 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
2898 SSL_F_TLS_CONSTRUCT_CERTIFICATE_REQUEST,
2899 ERR_R_INTERNAL_ERROR);
2900 return 0;
2901 }
2902 }
2903
2904 if (!construct_ca_names(s, get_ca_names(s), pkt)) {
2905 /* SSLfatal() already called */
2906 return 0;
2907 }
2908
2909 done:
2910 s->certreqs_sent++;
2911 s->s3.tmp.cert_request = 1;
2912 return 1;
2913}
2914
2915static int tls_process_cke_psk_preamble(SSL *s, PACKET *pkt)
2916{
2917#ifndef OPENSSL_NO_PSK
2918 unsigned char psk[PSK_MAX_PSK_LEN];
2919 size_t psklen;
2920 PACKET psk_identity;
2921
2922 if (!PACKET_get_length_prefixed_2(pkt, &psk_identity)) {
2923 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PROCESS_CKE_PSK_PREAMBLE,
2924 SSL_R_LENGTH_MISMATCH);
2925 return 0;
2926 }
2927 if (PACKET_remaining(&psk_identity) > PSK_MAX_IDENTITY_LEN) {
2928 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PROCESS_CKE_PSK_PREAMBLE,
2929 SSL_R_DATA_LENGTH_TOO_LONG);
2930 return 0;
2931 }
2932 if (s->psk_server_callback == NULL) {
2933 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CKE_PSK_PREAMBLE,
2934 SSL_R_PSK_NO_SERVER_CB);
2935 return 0;
2936 }
2937
2938 if (!PACKET_strndup(&psk_identity, &s->session->psk_identity)) {
2939 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CKE_PSK_PREAMBLE,
2940 ERR_R_INTERNAL_ERROR);
2941 return 0;
2942 }
2943
2944 psklen = s->psk_server_callback(s, s->session->psk_identity,
2945 psk, sizeof(psk));
2946
2947 if (psklen > PSK_MAX_PSK_LEN) {
2948 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CKE_PSK_PREAMBLE,
2949 ERR_R_INTERNAL_ERROR);
2950 return 0;
2951 } else if (psklen == 0) {
2952 /*
2953 * PSK related to the given identity not found
2954 */
2955 SSLfatal(s, SSL_AD_UNKNOWN_PSK_IDENTITY,
2956 SSL_F_TLS_PROCESS_CKE_PSK_PREAMBLE,
2957 SSL_R_PSK_IDENTITY_NOT_FOUND);
2958 return 0;
2959 }
2960
2961 OPENSSL_free(s->s3.tmp.psk);
2962 s->s3.tmp.psk = OPENSSL_memdup(psk, psklen);
2963 OPENSSL_cleanse(psk, psklen);
2964
2965 if (s->s3.tmp.psk == NULL) {
2966 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
2967 SSL_F_TLS_PROCESS_CKE_PSK_PREAMBLE, ERR_R_MALLOC_FAILURE);
2968 return 0;
2969 }
2970
2971 s->s3.tmp.psklen = psklen;
2972
2973 return 1;
2974#else
2975 /* Should never happen */
2976 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CKE_PSK_PREAMBLE,
2977 ERR_R_INTERNAL_ERROR);
2978 return 0;
2979#endif
2980}
2981
2982static int tls_process_cke_rsa(SSL *s, PACKET *pkt)
2983{
2984#ifndef OPENSSL_NO_RSA
2985 size_t outlen;
2986 PACKET enc_premaster;
2987 EVP_PKEY *rsa = NULL;
2988 unsigned char *rsa_decrypt = NULL;
2989 int ret = 0;
2990 EVP_PKEY_CTX *ctx = NULL;
2991 OSSL_PARAM params[3], *p = params;
2992
2993 rsa = s->cert->pkeys[SSL_PKEY_RSA].privatekey;
2994 if (rsa == NULL) {
2995 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CKE_RSA,
2996 SSL_R_MISSING_RSA_CERTIFICATE);
2997 return 0;
2998 }
2999
3000 /* SSLv3 and pre-standard DTLS omit the length bytes. */
3001 if (s->version == SSL3_VERSION || s->version == DTLS1_BAD_VER) {
3002 enc_premaster = *pkt;
3003 } else {
3004 if (!PACKET_get_length_prefixed_2(pkt, &enc_premaster)
3005 || PACKET_remaining(pkt) != 0) {
3006 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PROCESS_CKE_RSA,
3007 SSL_R_LENGTH_MISMATCH);
3008 return 0;
3009 }
3010 }
3011
3012 /*
3013 * We want to be sure that the plaintext buffer size makes it safe to
3014 * iterate over the entire size of a premaster secret
3015 * (SSL_MAX_MASTER_KEY_LENGTH). Reject overly short RSA keys because
3016 * their ciphertext cannot accommodate a premaster secret anyway.
3017 */
3018 if (EVP_PKEY_size(rsa) < RSA_PKCS1_PADDING_SIZE
3019 + SSL_MAX_MASTER_KEY_LENGTH) {
3020 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CKE_RSA,
3021 RSA_R_KEY_SIZE_TOO_SMALL);
3022 return 0;
3023 }
3024
3025 outlen = SSL_MAX_MASTER_KEY_LENGTH;
3026 rsa_decrypt = OPENSSL_malloc(outlen);
3027 if (rsa_decrypt == NULL) {
3028 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CKE_RSA,
3029 ERR_R_MALLOC_FAILURE);
3030 return 0;
3031 }
3032
3033 ctx = EVP_PKEY_CTX_new(rsa, NULL);
3034 if (ctx == NULL) {
3035 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CKE_RSA,
3036 ERR_R_MALLOC_FAILURE);
3037 goto err;
3038 }
3039
3040 /*
3041 * We must not leak whether a decryption failure occurs because of
3042 * Bleichenbacher's attack on PKCS #1 v1.5 RSA padding (see RFC 2246,
3043 * section 7.4.7.1). We use the special padding type
3044 * RSA_PKCS1_WITH_TLS_PADDING to do that. It will automaticaly decrypt the
3045 * RSA, check the padding and check that the client version is as expected
3046 * in the premaster secret. If any of that fails then the function appears
3047 * to return successfully but with a random result. The call below could
3048 * still fail if the input is publicly invalid.
3049 * See https://tools.ietf.org/html/rfc5246#section-7.4.7.1
3050 */
3051 if (EVP_PKEY_decrypt_init(ctx) <= 0
3052 || EVP_PKEY_CTX_set_rsa_padding(ctx, RSA_PKCS1_WITH_TLS_PADDING) <= 0) {
3053 SSLfatal(s, SSL_AD_DECRYPT_ERROR, SSL_F_TLS_PROCESS_CKE_RSA,
3054 SSL_R_DECRYPTION_FAILED);
3055 goto err;
3056 }
3057
3058 *p++ = OSSL_PARAM_construct_uint(OSSL_ASYM_CIPHER_PARAM_TLS_CLIENT_VERSION,
3059 (unsigned int *)&s->client_version);
3060 if ((s->options & SSL_OP_TLS_ROLLBACK_BUG) != 0)
3061 *p++ = OSSL_PARAM_construct_uint(
3062 OSSL_ASYM_CIPHER_PARAM_TLS_NEGOTIATED_VERSION,
3063 (unsigned int *)&s->version);
3064 *p++ = OSSL_PARAM_construct_end();
3065
3066 if (!EVP_PKEY_CTX_set_params(ctx, params)
3067 || EVP_PKEY_decrypt(ctx, rsa_decrypt, &outlen,
3068 PACKET_data(&enc_premaster),
3069 PACKET_remaining(&enc_premaster)) <= 0) {
3070 SSLfatal(s, SSL_AD_DECRYPT_ERROR, SSL_F_TLS_PROCESS_CKE_RSA,
3071 SSL_R_DECRYPTION_FAILED);
3072 goto err;
3073 }
3074
3075 /*
3076 * This test should never fail (otherwise we should have failed above) but
3077 * we double check anyway.
3078 */
3079 if (outlen != SSL_MAX_MASTER_KEY_LENGTH) {
3080 OPENSSL_cleanse(rsa_decrypt, SSL_MAX_MASTER_KEY_LENGTH);
3081 SSLfatal(s, SSL_AD_DECRYPT_ERROR, SSL_F_TLS_PROCESS_CKE_RSA,
3082 SSL_R_DECRYPTION_FAILED);
3083 goto err;
3084 }
3085
3086 /* Also cleanses rsa_decrypt (on success or failure) */
3087 if (!ssl_generate_master_secret(s, rsa_decrypt,
3088 SSL_MAX_MASTER_KEY_LENGTH, 0)) {
3089 /* SSLfatal() already called */
3090 goto err;
3091 }
3092
3093 ret = 1;
3094 err:
3095 OPENSSL_free(rsa_decrypt);
3096 EVP_PKEY_CTX_free(ctx);
3097 return ret;
3098#else
3099 /* Should never happen */
3100 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CKE_RSA,
3101 ERR_R_INTERNAL_ERROR);
3102 return 0;
3103#endif
3104}
3105
3106static int tls_process_cke_dhe(SSL *s, PACKET *pkt)
3107{
3108#ifndef OPENSSL_NO_DH
3109 EVP_PKEY *skey = NULL;
3110 DH *cdh;
3111 unsigned int i;
3112 BIGNUM *pub_key;
3113 const unsigned char *data;
3114 EVP_PKEY *ckey = NULL;
3115 int ret = 0;
3116
3117 if (!PACKET_get_net_2(pkt, &i) || PACKET_remaining(pkt) != i) {
3118 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PROCESS_CKE_DHE,
3119 SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
3120 goto err;
3121 }
3122 skey = s->s3.tmp.pkey;
3123 if (skey == NULL) {
3124 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CKE_DHE,
3125 SSL_R_MISSING_TMP_DH_KEY);
3126 goto err;
3127 }
3128
3129 if (PACKET_remaining(pkt) == 0L) {
3130 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PROCESS_CKE_DHE,
3131 SSL_R_MISSING_TMP_DH_KEY);
3132 goto err;
3133 }
3134 if (!PACKET_get_bytes(pkt, &data, i)) {
3135 /* We already checked we have enough data */
3136 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CKE_DHE,
3137 ERR_R_INTERNAL_ERROR);
3138 goto err;
3139 }
3140 ckey = EVP_PKEY_new();
3141 if (ckey == NULL || EVP_PKEY_copy_parameters(ckey, skey) == 0) {
3142 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CKE_DHE,
3143 SSL_R_BN_LIB);
3144 goto err;
3145 }
3146
3147 cdh = EVP_PKEY_get0_DH(ckey);
3148 pub_key = BN_bin2bn(data, i, NULL);
3149 if (pub_key == NULL || cdh == NULL || !DH_set0_key(cdh, pub_key, NULL)) {
3150 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CKE_DHE,
3151 ERR_R_INTERNAL_ERROR);
3152 BN_free(pub_key);
3153 goto err;
3154 }
3155
3156 if (ssl_derive(s, skey, ckey, 1) == 0) {
3157 /* SSLfatal() already called */
3158 goto err;
3159 }
3160
3161 ret = 1;
3162 EVP_PKEY_free(s->s3.tmp.pkey);
3163 s->s3.tmp.pkey = NULL;
3164 err:
3165 EVP_PKEY_free(ckey);
3166 return ret;
3167#else
3168 /* Should never happen */
3169 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CKE_DHE,
3170 ERR_R_INTERNAL_ERROR);
3171 return 0;
3172#endif
3173}
3174
3175static int tls_process_cke_ecdhe(SSL *s, PACKET *pkt)
3176{
3177#ifndef OPENSSL_NO_EC
3178 EVP_PKEY *skey = s->s3.tmp.pkey;
3179 EVP_PKEY *ckey = NULL;
3180 int ret = 0;
3181
3182 if (PACKET_remaining(pkt) == 0L) {
3183 /* We don't support ECDH client auth */
3184 SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE, SSL_F_TLS_PROCESS_CKE_ECDHE,
3185 SSL_R_MISSING_TMP_ECDH_KEY);
3186 goto err;
3187 } else {
3188 unsigned int i;
3189 const unsigned char *data;
3190
3191 /*
3192 * Get client's public key from encoded point in the
3193 * ClientKeyExchange message.
3194 */
3195
3196 /* Get encoded point length */
3197 if (!PACKET_get_1(pkt, &i) || !PACKET_get_bytes(pkt, &data, i)
3198 || PACKET_remaining(pkt) != 0) {
3199 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PROCESS_CKE_ECDHE,
3200 SSL_R_LENGTH_MISMATCH);
3201 goto err;
3202 }
3203 if (skey == NULL) {
3204 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CKE_ECDHE,
3205 SSL_R_MISSING_TMP_ECDH_KEY);
3206 goto err;
3207 }
3208
3209 ckey = EVP_PKEY_new();
3210 if (ckey == NULL || EVP_PKEY_copy_parameters(ckey, skey) <= 0) {
3211 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CKE_ECDHE,
3212 ERR_R_EVP_LIB);
3213 goto err;
3214 }
3215 if (EVP_PKEY_set1_tls_encodedpoint(ckey, data, i) == 0) {
3216 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CKE_ECDHE,
3217 ERR_R_EC_LIB);
3218 goto err;
3219 }
3220 }
3221
3222 if (ssl_derive(s, skey, ckey, 1) == 0) {
3223 /* SSLfatal() already called */
3224 goto err;
3225 }
3226
3227 ret = 1;
3228 EVP_PKEY_free(s->s3.tmp.pkey);
3229 s->s3.tmp.pkey = NULL;
3230 err:
3231 EVP_PKEY_free(ckey);
3232
3233 return ret;
3234#else
3235 /* Should never happen */
3236 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CKE_ECDHE,
3237 ERR_R_INTERNAL_ERROR);
3238 return 0;
3239#endif
3240}
3241
3242static int tls_process_cke_srp(SSL *s, PACKET *pkt)
3243{
3244#ifndef OPENSSL_NO_SRP
3245 unsigned int i;
3246 const unsigned char *data;
3247
3248 if (!PACKET_get_net_2(pkt, &i)
3249 || !PACKET_get_bytes(pkt, &data, i)) {
3250 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PROCESS_CKE_SRP,
3251 SSL_R_BAD_SRP_A_LENGTH);
3252 return 0;
3253 }
3254 if ((s->srp_ctx.A = BN_bin2bn(data, i, NULL)) == NULL) {
3255 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CKE_SRP,
3256 ERR_R_BN_LIB);
3257 return 0;
3258 }
3259 if (BN_ucmp(s->srp_ctx.A, s->srp_ctx.N) >= 0 || BN_is_zero(s->srp_ctx.A)) {
3260 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_F_TLS_PROCESS_CKE_SRP,
3261 SSL_R_BAD_SRP_PARAMETERS);
3262 return 0;
3263 }
3264 OPENSSL_free(s->session->srp_username);
3265 s->session->srp_username = OPENSSL_strdup(s->srp_ctx.login);
3266 if (s->session->srp_username == NULL) {
3267 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CKE_SRP,
3268 ERR_R_MALLOC_FAILURE);
3269 return 0;
3270 }
3271
3272 if (!srp_generate_server_master_secret(s)) {
3273 /* SSLfatal() already called */
3274 return 0;
3275 }
3276
3277 return 1;
3278#else
3279 /* Should never happen */
3280 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CKE_SRP,
3281 ERR_R_INTERNAL_ERROR);
3282 return 0;
3283#endif
3284}
3285
3286static int tls_process_cke_gost(SSL *s, PACKET *pkt)
3287{
3288#ifndef OPENSSL_NO_GOST
3289 EVP_PKEY_CTX *pkey_ctx;
3290 EVP_PKEY *client_pub_pkey = NULL, *pk = NULL;
3291 unsigned char premaster_secret[32];
3292 const unsigned char *start;
3293 size_t outlen = 32, inlen;
3294 unsigned long alg_a;
3295 GOST_KX_MESSAGE *pKX = NULL;
3296 const unsigned char *ptr;
3297 int ret = 0;
3298
3299 /* Get our certificate private key */
3300 alg_a = s->s3.tmp.new_cipher->algorithm_auth;
3301 if (alg_a & SSL_aGOST12) {
3302 /*
3303 * New GOST ciphersuites have SSL_aGOST01 bit too
3304 */
3305 pk = s->cert->pkeys[SSL_PKEY_GOST12_512].privatekey;
3306 if (pk == NULL) {
3307 pk = s->cert->pkeys[SSL_PKEY_GOST12_256].privatekey;
3308 }
3309 if (pk == NULL) {
3310 pk = s->cert->pkeys[SSL_PKEY_GOST01].privatekey;
3311 }
3312 } else if (alg_a & SSL_aGOST01) {
3313 pk = s->cert->pkeys[SSL_PKEY_GOST01].privatekey;
3314 }
3315
3316 pkey_ctx = EVP_PKEY_CTX_new(pk, NULL);
3317 if (pkey_ctx == NULL) {
3318 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CKE_GOST,
3319 ERR_R_MALLOC_FAILURE);
3320 return 0;
3321 }
3322 if (EVP_PKEY_decrypt_init(pkey_ctx) <= 0) {
3323 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CKE_GOST,
3324 ERR_R_INTERNAL_ERROR);
3325 return 0;
3326 }
3327 /*
3328 * If client certificate is present and is of the same type, maybe
3329 * use it for key exchange. Don't mind errors from
3330 * EVP_PKEY_derive_set_peer, because it is completely valid to use a
3331 * client certificate for authorization only.
3332 */
3333 client_pub_pkey = X509_get0_pubkey(s->session->peer);
3334 if (client_pub_pkey) {
3335 if (EVP_PKEY_derive_set_peer(pkey_ctx, client_pub_pkey) <= 0)
3336 ERR_clear_error();
3337 }
3338
3339 ptr = PACKET_data(pkt);
3340 /* Some implementations provide extra data in the opaqueBlob
3341 * We have nothing to do with this blob so we just skip it */
3342 pKX = d2i_GOST_KX_MESSAGE(NULL, &ptr, PACKET_remaining(pkt));
3343 if (pKX == NULL
3344 || pKX->kxBlob == NULL
3345 || ASN1_TYPE_get(pKX->kxBlob) != V_ASN1_SEQUENCE) {
3346 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PROCESS_CKE_GOST,
3347 SSL_R_DECRYPTION_FAILED);
3348 goto err;
3349 }
3350
3351 if (!PACKET_forward(pkt, ptr - PACKET_data(pkt))) {
3352 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CKE_GOST,
3353 SSL_R_DECRYPTION_FAILED);
3354 goto err;
3355 }
3356
3357 if (PACKET_remaining(pkt) != 0) {
3358 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CKE_GOST,
3359 SSL_R_DECRYPTION_FAILED);
3360 goto err;
3361 }
3362
3363 inlen = pKX->kxBlob->value.sequence->length;
3364 start = pKX->kxBlob->value.sequence->data;
3365
3366 if (EVP_PKEY_decrypt(pkey_ctx, premaster_secret, &outlen, start,
3367 inlen) <= 0) {
3368 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PROCESS_CKE_GOST,
3369 SSL_R_DECRYPTION_FAILED);
3370 goto err;
3371 }
3372 /* Generate master secret */
3373 if (!ssl_generate_master_secret(s, premaster_secret,
3374 sizeof(premaster_secret), 0)) {
3375 /* SSLfatal() already called */
3376 goto err;
3377 }
3378 /* Check if pubkey from client certificate was used */
3379 if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2,
3380 NULL) > 0)
3381 s->statem.no_cert_verify = 1;
3382
3383 ret = 1;
3384 err:
3385 EVP_PKEY_CTX_free(pkey_ctx);
3386 GOST_KX_MESSAGE_free(pKX);
3387 return ret;
3388#else
3389 /* Should never happen */
3390 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CKE_GOST,
3391 ERR_R_INTERNAL_ERROR);
3392 return 0;
3393#endif
3394}
3395
3396MSG_PROCESS_RETURN tls_process_client_key_exchange(SSL *s, PACKET *pkt)
3397{
3398 unsigned long alg_k;
3399
3400 alg_k = s->s3.tmp.new_cipher->algorithm_mkey;
3401
3402 /* For PSK parse and retrieve identity, obtain PSK key */
3403 if ((alg_k & SSL_PSK) && !tls_process_cke_psk_preamble(s, pkt)) {
3404 /* SSLfatal() already called */
3405 goto err;
3406 }
3407
3408 if (alg_k & SSL_kPSK) {
3409 /* Identity extracted earlier: should be nothing left */
3410 if (PACKET_remaining(pkt) != 0) {
3411 SSLfatal(s, SSL_AD_DECODE_ERROR,
3412 SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE,
3413 SSL_R_LENGTH_MISMATCH);
3414 goto err;
3415 }
3416 /* PSK handled by ssl_generate_master_secret */
3417 if (!ssl_generate_master_secret(s, NULL, 0, 0)) {
3418 /* SSLfatal() already called */
3419 goto err;
3420 }
3421 } else if (alg_k & (SSL_kRSA | SSL_kRSAPSK)) {
3422 if (!tls_process_cke_rsa(s, pkt)) {
3423 /* SSLfatal() already called */
3424 goto err;
3425 }
3426 } else if (alg_k & (SSL_kDHE | SSL_kDHEPSK)) {
3427 if (!tls_process_cke_dhe(s, pkt)) {
3428 /* SSLfatal() already called */
3429 goto err;
3430 }
3431 } else if (alg_k & (SSL_kECDHE | SSL_kECDHEPSK)) {
3432 if (!tls_process_cke_ecdhe(s, pkt)) {
3433 /* SSLfatal() already called */
3434 goto err;
3435 }
3436 } else if (alg_k & SSL_kSRP) {
3437 if (!tls_process_cke_srp(s, pkt)) {
3438 /* SSLfatal() already called */
3439 goto err;
3440 }
3441 } else if (alg_k & SSL_kGOST) {
3442 if (!tls_process_cke_gost(s, pkt)) {
3443 /* SSLfatal() already called */
3444 goto err;
3445 }
3446 } else {
3447 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
3448 SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE,
3449 SSL_R_UNKNOWN_CIPHER_TYPE);
3450 goto err;
3451 }
3452
3453 return MSG_PROCESS_CONTINUE_PROCESSING;
3454 err:
3455#ifndef OPENSSL_NO_PSK
3456 OPENSSL_clear_free(s->s3.tmp.psk, s->s3.tmp.psklen);
3457 s->s3.tmp.psk = NULL;
3458#endif
3459 return MSG_PROCESS_ERROR;
3460}
3461
3462WORK_STATE tls_post_process_client_key_exchange(SSL *s, WORK_STATE wst)
3463{
3464#ifndef OPENSSL_NO_SCTP
3465 if (wst == WORK_MORE_A) {
3466 if (SSL_IS_DTLS(s)) {
3467 unsigned char sctpauthkey[64];
3468 char labelbuffer[sizeof(DTLS1_SCTP_AUTH_LABEL)];
3469 size_t labellen;
3470 /*
3471 * Add new shared key for SCTP-Auth, will be ignored if no SCTP
3472 * used.
3473 */
3474 memcpy(labelbuffer, DTLS1_SCTP_AUTH_LABEL,
3475 sizeof(DTLS1_SCTP_AUTH_LABEL));
3476
3477 /* Don't include the terminating zero. */
3478 labellen = sizeof(labelbuffer) - 1;
3479 if (s->mode & SSL_MODE_DTLS_SCTP_LABEL_LENGTH_BUG)
3480 labellen += 1;
3481
3482 if (SSL_export_keying_material(s, sctpauthkey,
3483 sizeof(sctpauthkey), labelbuffer,
3484 labellen, NULL, 0,
3485 0) <= 0) {
3486 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
3487 SSL_F_TLS_POST_PROCESS_CLIENT_KEY_EXCHANGE,
3488 ERR_R_INTERNAL_ERROR);
3489 return WORK_ERROR;
3490 }
3491
3492 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
3493 sizeof(sctpauthkey), sctpauthkey);
3494 }
3495 }
3496#endif
3497
3498 if (s->statem.no_cert_verify || !s->session->peer) {
3499 /*
3500 * No certificate verify or no peer certificate so we no longer need
3501 * the handshake_buffer
3502 */
3503 if (!ssl3_digest_cached_records(s, 0)) {
3504 /* SSLfatal() already called */
3505 return WORK_ERROR;
3506 }
3507 return WORK_FINISHED_CONTINUE;
3508 } else {
3509 if (!s->s3.handshake_buffer) {
3510 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
3511 SSL_F_TLS_POST_PROCESS_CLIENT_KEY_EXCHANGE,
3512 ERR_R_INTERNAL_ERROR);
3513 return WORK_ERROR;
3514 }
3515 /*
3516 * For sigalgs freeze the handshake buffer. If we support
3517 * extms we've done this already so this is a no-op
3518 */
3519 if (!ssl3_digest_cached_records(s, 1)) {
3520 /* SSLfatal() already called */
3521 return WORK_ERROR;
3522 }
3523 }
3524
3525 return WORK_FINISHED_CONTINUE;
3526}
3527
3528MSG_PROCESS_RETURN tls_process_client_certificate(SSL *s, PACKET *pkt)
3529{
3530 int i;
3531 MSG_PROCESS_RETURN ret = MSG_PROCESS_ERROR;
3532 X509 *x = NULL;
3533 unsigned long l;
3534 const unsigned char *certstart, *certbytes;
3535 STACK_OF(X509) *sk = NULL;
3536 PACKET spkt, context;
3537 size_t chainidx;
3538 SSL_SESSION *new_sess = NULL;
3539
3540 /*
3541 * To get this far we must have read encrypted data from the client. We no
3542 * longer tolerate unencrypted alerts. This value is ignored if less than
3543 * TLSv1.3
3544 */
3545 s->statem.enc_read_state = ENC_READ_STATE_VALID;
3546
3547 if ((sk = sk_X509_new_null()) == NULL) {
3548 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE,
3549 ERR_R_MALLOC_FAILURE);
3550 goto err;
3551 }
3552
3553 if (SSL_IS_TLS13(s) && (!PACKET_get_length_prefixed_1(pkt, &context)
3554 || (s->pha_context == NULL && PACKET_remaining(&context) != 0)
3555 || (s->pha_context != NULL &&
3556 !PACKET_equal(&context, s->pha_context, s->pha_context_len)))) {
3557 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE,
3558 SSL_R_INVALID_CONTEXT);
3559 goto err;
3560 }
3561
3562 if (!PACKET_get_length_prefixed_3(pkt, &spkt)
3563 || PACKET_remaining(pkt) != 0) {
3564 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE,
3565 SSL_R_LENGTH_MISMATCH);
3566 goto err;
3567 }
3568
3569 for (chainidx = 0; PACKET_remaining(&spkt) > 0; chainidx++) {
3570 if (!PACKET_get_net_3(&spkt, &l)
3571 || !PACKET_get_bytes(&spkt, &certbytes, l)) {
3572 SSLfatal(s, SSL_AD_DECODE_ERROR,
3573 SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE,
3574 SSL_R_CERT_LENGTH_MISMATCH);
3575 goto err;
3576 }
3577
3578 certstart = certbytes;
3579 x = d2i_X509(NULL, (const unsigned char **)&certbytes, l);
3580 if (x == NULL) {
3581 SSLfatal(s, SSL_AD_DECODE_ERROR,
3582 SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, ERR_R_ASN1_LIB);
3583 goto err;
3584 }
3585 if (certbytes != (certstart + l)) {
3586 SSLfatal(s, SSL_AD_DECODE_ERROR,
3587 SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE,
3588 SSL_R_CERT_LENGTH_MISMATCH);
3589 goto err;
3590 }
3591
3592 if (SSL_IS_TLS13(s)) {
3593 RAW_EXTENSION *rawexts = NULL;
3594 PACKET extensions;
3595
3596 if (!PACKET_get_length_prefixed_2(&spkt, &extensions)) {
3597 SSLfatal(s, SSL_AD_DECODE_ERROR,
3598 SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE,
3599 SSL_R_BAD_LENGTH);
3600 goto err;
3601 }
3602 if (!tls_collect_extensions(s, &extensions,
3603 SSL_EXT_TLS1_3_CERTIFICATE, &rawexts,
3604 NULL, chainidx == 0)
3605 || !tls_parse_all_extensions(s, SSL_EXT_TLS1_3_CERTIFICATE,
3606 rawexts, x, chainidx,
3607 PACKET_remaining(&spkt) == 0)) {
3608 OPENSSL_free(rawexts);
3609 goto err;
3610 }
3611 OPENSSL_free(rawexts);
3612 }
3613
3614 if (!sk_X509_push(sk, x)) {
3615 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
3616 SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE,
3617 ERR_R_MALLOC_FAILURE);
3618 goto err;
3619 }
3620 x = NULL;
3621 }
3622
3623 if (sk_X509_num(sk) <= 0) {
3624 /* TLS does not mind 0 certs returned */
3625 if (s->version == SSL3_VERSION) {
3626 SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE,
3627 SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE,
3628 SSL_R_NO_CERTIFICATES_RETURNED);
3629 goto err;
3630 }
3631 /* Fail for TLS only if we required a certificate */
3632 else if ((s->verify_mode & SSL_VERIFY_PEER) &&
3633 (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) {
3634 SSLfatal(s, SSL_AD_CERTIFICATE_REQUIRED,
3635 SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE,
3636 SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
3637 goto err;
3638 }
3639 /* No client certificate so digest cached records */
3640 if (s->s3.handshake_buffer && !ssl3_digest_cached_records(s, 0)) {
3641 /* SSLfatal() already called */
3642 goto err;
3643 }
3644 } else {
3645 EVP_PKEY *pkey;
3646 i = ssl_verify_cert_chain(s, sk);
3647 if (i <= 0) {
3648 SSLfatal(s, ssl_x509err2alert(s->verify_result),
3649 SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE,
3650 SSL_R_CERTIFICATE_VERIFY_FAILED);
3651 goto err;
3652 }
3653 if (i > 1) {
3654 SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE,
3655 SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, i);
3656 goto err;
3657 }
3658 pkey = X509_get0_pubkey(sk_X509_value(sk, 0));
3659 if (pkey == NULL) {
3660 SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE,
3661 SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE,
3662 SSL_R_UNKNOWN_CERTIFICATE_TYPE);
3663 goto err;
3664 }
3665 }
3666
3667 /*
3668 * Sessions must be immutable once they go into the session cache. Otherwise
3669 * we can get multi-thread problems. Therefore we don't "update" sessions,
3670 * we replace them with a duplicate. Here, we need to do this every time
3671 * a new certificate is received via post-handshake authentication, as the
3672 * session may have already gone into the session cache.
3673 */
3674
3675 if (s->post_handshake_auth == SSL_PHA_REQUESTED) {
3676 if ((new_sess = ssl_session_dup(s->session, 0)) == 0) {
3677 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
3678 SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE,
3679 ERR_R_MALLOC_FAILURE);
3680 goto err;
3681 }
3682
3683 SSL_SESSION_free(s->session);
3684 s->session = new_sess;
3685 }
3686
3687 X509_free(s->session->peer);
3688 s->session->peer = sk_X509_shift(sk);
3689 s->session->verify_result = s->verify_result;
3690
3691 sk_X509_pop_free(s->session->peer_chain, X509_free);
3692 s->session->peer_chain = sk;
3693
3694 /*
3695 * Freeze the handshake buffer. For <TLS1.3 we do this after the CKE
3696 * message
3697 */
3698 if (SSL_IS_TLS13(s) && !ssl3_digest_cached_records(s, 1)) {
3699 /* SSLfatal() already called */
3700 goto err;
3701 }
3702
3703 /*
3704 * Inconsistency alert: cert_chain does *not* include the peer's own
3705 * certificate, while we do include it in statem_clnt.c
3706 */
3707 sk = NULL;
3708
3709 /* Save the current hash state for when we receive the CertificateVerify */
3710 if (SSL_IS_TLS13(s)) {
3711 if (!ssl_handshake_hash(s, s->cert_verify_hash,
3712 sizeof(s->cert_verify_hash),
3713 &s->cert_verify_hash_len)) {
3714 /* SSLfatal() already called */
3715 goto err;
3716 }
3717
3718 /* Resend session tickets */
3719 s->sent_tickets = 0;
3720 }
3721
3722 ret = MSG_PROCESS_CONTINUE_READING;
3723
3724 err:
3725 X509_free(x);
3726 sk_X509_pop_free(sk, X509_free);
3727 return ret;
3728}
3729
3730int tls_construct_server_certificate(SSL *s, WPACKET *pkt)
3731{
3732 CERT_PKEY *cpk = s->s3.tmp.cert;
3733
3734 if (cpk == NULL) {
3735 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
3736 SSL_F_TLS_CONSTRUCT_SERVER_CERTIFICATE, ERR_R_INTERNAL_ERROR);
3737 return 0;
3738 }
3739
3740 /*
3741 * In TLSv1.3 the certificate chain is always preceded by a 0 length context
3742 * for the server Certificate message
3743 */
3744 if (SSL_IS_TLS13(s) && !WPACKET_put_bytes_u8(pkt, 0)) {
3745 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
3746 SSL_F_TLS_CONSTRUCT_SERVER_CERTIFICATE, ERR_R_INTERNAL_ERROR);
3747 return 0;
3748 }
3749 if (!ssl3_output_cert_chain(s, pkt, cpk)) {
3750 /* SSLfatal() already called */
3751 return 0;
3752 }
3753
3754 return 1;
3755}
3756
3757static int create_ticket_prequel(SSL *s, WPACKET *pkt, uint32_t age_add,
3758 unsigned char *tick_nonce)
3759{
3760 /*
3761 * Ticket lifetime hint: For TLSv1.2 this is advisory only and we leave this
3762 * unspecified for resumed session (for simplicity).
3763 * In TLSv1.3 we reset the "time" field above, and always specify the
3764 * timeout.
3765 */
3766 if (!WPACKET_put_bytes_u32(pkt,
3767 (s->hit && !SSL_IS_TLS13(s))
3768 ? 0 : s->session->timeout)) {
3769 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_CREATE_TICKET_PREQUEL,
3770 ERR_R_INTERNAL_ERROR);
3771 return 0;
3772 }
3773
3774 if (SSL_IS_TLS13(s)) {
3775 if (!WPACKET_put_bytes_u32(pkt, age_add)
3776 || !WPACKET_sub_memcpy_u8(pkt, tick_nonce, TICKET_NONCE_SIZE)) {
3777 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_CREATE_TICKET_PREQUEL,
3778 ERR_R_INTERNAL_ERROR);
3779 return 0;
3780 }
3781 }
3782
3783 /* Start the sub-packet for the actual ticket data */
3784 if (!WPACKET_start_sub_packet_u16(pkt)) {
3785 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_CREATE_TICKET_PREQUEL,
3786 ERR_R_INTERNAL_ERROR);
3787 return 0;
3788 }
3789
3790 return 1;
3791}
3792
3793static int construct_stateless_ticket(SSL *s, WPACKET *pkt, uint32_t age_add,
3794 unsigned char *tick_nonce)
3795{
3796 unsigned char *senc = NULL;
3797 EVP_CIPHER_CTX *ctx = NULL;
3798 HMAC_CTX *hctx = NULL;
3799 unsigned char *p, *encdata1, *encdata2, *macdata1, *macdata2;
3800 const unsigned char *const_p;
3801 int len, slen_full, slen, lenfinal;
3802 SSL_SESSION *sess;
3803 unsigned int hlen;
3804 SSL_CTX *tctx = s->session_ctx;
3805 unsigned char iv[EVP_MAX_IV_LENGTH];
3806 unsigned char key_name[TLSEXT_KEYNAME_LENGTH];
3807 int iv_len, ok = 0;
3808 size_t macoffset, macendoffset;
3809
3810 /* get session encoding length */
3811 slen_full = i2d_SSL_SESSION(s->session, NULL);
3812 /*
3813 * Some length values are 16 bits, so forget it if session is too
3814 * long
3815 */
3816 if (slen_full == 0 || slen_full > 0xFF00) {
3817 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_CONSTRUCT_STATELESS_TICKET,
3818 ERR_R_INTERNAL_ERROR);
3819 goto err;
3820 }
3821 senc = OPENSSL_malloc(slen_full);
3822 if (senc == NULL) {
3823 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
3824 SSL_F_CONSTRUCT_STATELESS_TICKET, ERR_R_MALLOC_FAILURE);
3825 goto err;
3826 }
3827
3828 ctx = EVP_CIPHER_CTX_new();
3829 hctx = HMAC_CTX_new();
3830 if (ctx == NULL || hctx == NULL) {
3831 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_CONSTRUCT_STATELESS_TICKET,
3832 ERR_R_MALLOC_FAILURE);
3833 goto err;
3834 }
3835
3836 p = senc;
3837 if (!i2d_SSL_SESSION(s->session, &p)) {
3838 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_CONSTRUCT_STATELESS_TICKET,
3839 ERR_R_INTERNAL_ERROR);
3840 goto err;
3841 }
3842
3843 /*
3844 * create a fresh copy (not shared with other threads) to clean up
3845 */
3846 const_p = senc;
3847 sess = d2i_SSL_SESSION(NULL, &const_p, slen_full);
3848 if (sess == NULL) {
3849 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_CONSTRUCT_STATELESS_TICKET,
3850 ERR_R_INTERNAL_ERROR);
3851 goto err;
3852 }
3853
3854 slen = i2d_SSL_SESSION(sess, NULL);
3855 if (slen == 0 || slen > slen_full) {
3856 /* shouldn't ever happen */
3857 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_CONSTRUCT_STATELESS_TICKET,
3858 ERR_R_INTERNAL_ERROR);
3859 SSL_SESSION_free(sess);
3860 goto err;
3861 }
3862 p = senc;
3863 if (!i2d_SSL_SESSION(sess, &p)) {
3864 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_CONSTRUCT_STATELESS_TICKET,
3865 ERR_R_INTERNAL_ERROR);
3866 SSL_SESSION_free(sess);
3867 goto err;
3868 }
3869 SSL_SESSION_free(sess);
3870
3871 /*
3872 * Initialize HMAC and cipher contexts. If callback present it does
3873 * all the work otherwise use generated values from parent ctx.
3874 */
3875 if (tctx->ext.ticket_key_cb) {
3876 /* if 0 is returned, write an empty ticket */
3877 int ret = tctx->ext.ticket_key_cb(s, key_name, iv, ctx,
3878 hctx, 1);
3879
3880 if (ret == 0) {
3881
3882 /* Put timeout and length */
3883 if (!WPACKET_put_bytes_u32(pkt, 0)
3884 || !WPACKET_put_bytes_u16(pkt, 0)) {
3885 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
3886 SSL_F_CONSTRUCT_STATELESS_TICKET,
3887 ERR_R_INTERNAL_ERROR);
3888 goto err;
3889 }
3890 OPENSSL_free(senc);
3891 EVP_CIPHER_CTX_free(ctx);
3892 HMAC_CTX_free(hctx);
3893 return 1;
3894 }
3895 if (ret < 0) {
3896 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_CONSTRUCT_STATELESS_TICKET,
3897 SSL_R_CALLBACK_FAILED);
3898 goto err;
3899 }
3900 iv_len = EVP_CIPHER_CTX_iv_length(ctx);
3901 } else {
3902 const EVP_CIPHER *cipher = EVP_aes_256_cbc();
3903
3904 iv_len = EVP_CIPHER_iv_length(cipher);
3905 if (RAND_bytes(iv, iv_len) <= 0
3906 || !EVP_EncryptInit_ex(ctx, cipher, NULL,
3907 tctx->ext.secure->tick_aes_key, iv)
3908 || !HMAC_Init_ex(hctx, tctx->ext.secure->tick_hmac_key,
3909 sizeof(tctx->ext.secure->tick_hmac_key),
3910 EVP_sha256(), NULL)) {
3911 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_CONSTRUCT_STATELESS_TICKET,
3912 ERR_R_INTERNAL_ERROR);
3913 goto err;
3914 }
3915 memcpy(key_name, tctx->ext.tick_key_name,
3916 sizeof(tctx->ext.tick_key_name));
3917 }
3918
3919 if (!create_ticket_prequel(s, pkt, age_add, tick_nonce)) {
3920 /* SSLfatal() already called */
3921 goto err;
3922 }
3923
3924 if (!WPACKET_get_total_written(pkt, &macoffset)
3925 /* Output key name */
3926 || !WPACKET_memcpy(pkt, key_name, sizeof(key_name))
3927 /* output IV */
3928 || !WPACKET_memcpy(pkt, iv, iv_len)
3929 || !WPACKET_reserve_bytes(pkt, slen + EVP_MAX_BLOCK_LENGTH,
3930 &encdata1)
3931 /* Encrypt session data */
3932 || !EVP_EncryptUpdate(ctx, encdata1, &len, senc, slen)
3933 || !WPACKET_allocate_bytes(pkt, len, &encdata2)
3934 || encdata1 != encdata2
3935 || !EVP_EncryptFinal(ctx, encdata1 + len, &lenfinal)
3936 || !WPACKET_allocate_bytes(pkt, lenfinal, &encdata2)
3937 || encdata1 + len != encdata2
3938 || len + lenfinal > slen + EVP_MAX_BLOCK_LENGTH
3939 || !WPACKET_get_total_written(pkt, &macendoffset)
3940 || !HMAC_Update(hctx,
3941 (unsigned char *)s->init_buf->data + macoffset,
3942 macendoffset - macoffset)
3943 || !WPACKET_reserve_bytes(pkt, EVP_MAX_MD_SIZE, &macdata1)
3944 || !HMAC_Final(hctx, macdata1, &hlen)
3945 || hlen > EVP_MAX_MD_SIZE
3946 || !WPACKET_allocate_bytes(pkt, hlen, &macdata2)
3947 || macdata1 != macdata2) {
3948 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
3949 SSL_F_CONSTRUCT_STATELESS_TICKET, ERR_R_INTERNAL_ERROR);
3950 goto err;
3951 }
3952
3953 /* Close the sub-packet created by create_ticket_prequel() */
3954 if (!WPACKET_close(pkt)) {
3955 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_CONSTRUCT_STATELESS_TICKET,
3956 ERR_R_INTERNAL_ERROR);
3957 goto err;
3958 }
3959
3960 ok = 1;
3961 err:
3962 OPENSSL_free(senc);
3963 EVP_CIPHER_CTX_free(ctx);
3964 HMAC_CTX_free(hctx);
3965 return ok;
3966}
3967
3968static int construct_stateful_ticket(SSL *s, WPACKET *pkt, uint32_t age_add,
3969 unsigned char *tick_nonce)
3970{
3971 if (!create_ticket_prequel(s, pkt, age_add, tick_nonce)) {
3972 /* SSLfatal() already called */
3973 return 0;
3974 }
3975
3976 if (!WPACKET_memcpy(pkt, s->session->session_id,
3977 s->session->session_id_length)
3978 || !WPACKET_close(pkt)) {
3979 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_CONSTRUCT_STATEFUL_TICKET,
3980 ERR_R_INTERNAL_ERROR);
3981 return 0;
3982 }
3983
3984 return 1;
3985}
3986
3987int tls_construct_new_session_ticket(SSL *s, WPACKET *pkt)
3988{
3989 SSL_CTX *tctx = s->session_ctx;
3990 unsigned char tick_nonce[TICKET_NONCE_SIZE];
3991 union {
3992 unsigned char age_add_c[sizeof(uint32_t)];
3993 uint32_t age_add;
3994 } age_add_u;
3995
3996 age_add_u.age_add = 0;
3997
3998 if (SSL_IS_TLS13(s)) {
3999 size_t i, hashlen;
4000 uint64_t nonce;
4001 static const unsigned char nonce_label[] = "resumption";
4002 const EVP_MD *md = ssl_handshake_md(s);
4003 int hashleni = EVP_MD_size(md);
4004
4005 /* Ensure cast to size_t is safe */
4006 if (!ossl_assert(hashleni >= 0)) {
4007 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
4008 SSL_F_TLS_CONSTRUCT_NEW_SESSION_TICKET,
4009 ERR_R_INTERNAL_ERROR);
4010 goto err;
4011 }
4012 hashlen = (size_t)hashleni;
4013
4014 /*
4015 * If we already sent one NewSessionTicket, or we resumed then
4016 * s->session may already be in a cache and so we must not modify it.
4017 * Instead we need to take a copy of it and modify that.
4018 */
4019 if (s->sent_tickets != 0 || s->hit) {
4020 SSL_SESSION *new_sess = ssl_session_dup(s->session, 0);
4021
4022 if (new_sess == NULL) {
4023 /* SSLfatal already called */
4024 goto err;
4025 }
4026
4027 SSL_SESSION_free(s->session);
4028 s->session = new_sess;
4029 }
4030
4031 if (!ssl_generate_session_id(s, s->session)) {
4032 /* SSLfatal() already called */
4033 goto err;
4034 }
4035 if (RAND_bytes(age_add_u.age_add_c, sizeof(age_add_u)) <= 0) {
4036 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
4037 SSL_F_TLS_CONSTRUCT_NEW_SESSION_TICKET,
4038 ERR_R_INTERNAL_ERROR);
4039 goto err;
4040 }
4041 s->session->ext.tick_age_add = age_add_u.age_add;
4042
4043 nonce = s->next_ticket_nonce;
4044 for (i = TICKET_NONCE_SIZE; i > 0; i--) {
4045 tick_nonce[i - 1] = (unsigned char)(nonce & 0xff);
4046 nonce >>= 8;
4047 }
4048
4049 if (!tls13_hkdf_expand(s, md, s->resumption_master_secret,
4050 nonce_label,
4051 sizeof(nonce_label) - 1,
4052 tick_nonce,
4053 TICKET_NONCE_SIZE,
4054 s->session->master_key,
4055 hashlen, 1)) {
4056 /* SSLfatal() already called */
4057 goto err;
4058 }
4059 s->session->master_key_length = hashlen;
4060
4061 s->session->time = (long)time(NULL);
4062 if (s->s3.alpn_selected != NULL) {
4063 OPENSSL_free(s->session->ext.alpn_selected);
4064 s->session->ext.alpn_selected =
4065 OPENSSL_memdup(s->s3.alpn_selected, s->s3.alpn_selected_len);
4066 if (s->session->ext.alpn_selected == NULL) {
4067 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
4068 SSL_F_TLS_CONSTRUCT_NEW_SESSION_TICKET,
4069 ERR_R_MALLOC_FAILURE);
4070 goto err;
4071 }
4072 s->session->ext.alpn_selected_len = s->s3.alpn_selected_len;
4073 }
4074 s->session->ext.max_early_data = s->max_early_data;
4075 }
4076
4077 if (tctx->generate_ticket_cb != NULL &&
4078 tctx->generate_ticket_cb(s, tctx->ticket_cb_data) == 0)
4079 goto err;
4080
4081 /*
4082 * If we are using anti-replay protection then we behave as if
4083 * SSL_OP_NO_TICKET is set - we are caching tickets anyway so there
4084 * is no point in using full stateless tickets.
4085 */
4086 if (SSL_IS_TLS13(s)
4087 && ((s->options & SSL_OP_NO_TICKET) != 0
4088 || (s->max_early_data > 0
4089 && (s->options & SSL_OP_NO_ANTI_REPLAY) == 0))) {
4090 if (!construct_stateful_ticket(s, pkt, age_add_u.age_add, tick_nonce)) {
4091 /* SSLfatal() already called */
4092 goto err;
4093 }
4094 } else if (!construct_stateless_ticket(s, pkt, age_add_u.age_add,
4095 tick_nonce)) {
4096 /* SSLfatal() already called */
4097 goto err;
4098 }
4099
4100 if (SSL_IS_TLS13(s)) {
4101 if (!tls_construct_extensions(s, pkt,
4102 SSL_EXT_TLS1_3_NEW_SESSION_TICKET,
4103 NULL, 0)) {
4104 /* SSLfatal() already called */
4105 goto err;
4106 }
4107 /*
4108 * Increment both |sent_tickets| and |next_ticket_nonce|. |sent_tickets|
4109 * gets reset to 0 if we send more tickets following a post-handshake
4110 * auth, but |next_ticket_nonce| does not.
4111 */
4112 s->sent_tickets++;
4113 s->next_ticket_nonce++;
4114 ssl_update_cache(s, SSL_SESS_CACHE_SERVER);
4115 }
4116
4117 return 1;
4118 err:
4119 return 0;
4120}
4121
4122/*
4123 * In TLSv1.3 this is called from the extensions code, otherwise it is used to
4124 * create a separate message. Returns 1 on success or 0 on failure.
4125 */
4126int tls_construct_cert_status_body(SSL *s, WPACKET *pkt)
4127{
4128 if (!WPACKET_put_bytes_u8(pkt, s->ext.status_type)
4129 || !WPACKET_sub_memcpy_u24(pkt, s->ext.ocsp.resp,
4130 s->ext.ocsp.resp_len)) {
4131 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CERT_STATUS_BODY,
4132 ERR_R_INTERNAL_ERROR);
4133 return 0;
4134 }
4135
4136 return 1;
4137}
4138
4139int tls_construct_cert_status(SSL *s, WPACKET *pkt)
4140{
4141 if (!tls_construct_cert_status_body(s, pkt)) {
4142 /* SSLfatal() already called */
4143 return 0;
4144 }
4145
4146 return 1;
4147}
4148
4149#ifndef OPENSSL_NO_NEXTPROTONEG
4150/*
4151 * tls_process_next_proto reads a Next Protocol Negotiation handshake message.
4152 * It sets the next_proto member in s if found
4153 */
4154MSG_PROCESS_RETURN tls_process_next_proto(SSL *s, PACKET *pkt)
4155{
4156 PACKET next_proto, padding;
4157 size_t next_proto_len;
4158
4159 /*-
4160 * The payload looks like:
4161 * uint8 proto_len;
4162 * uint8 proto[proto_len];
4163 * uint8 padding_len;
4164 * uint8 padding[padding_len];
4165 */
4166 if (!PACKET_get_length_prefixed_1(pkt, &next_proto)
4167 || !PACKET_get_length_prefixed_1(pkt, &padding)
4168 || PACKET_remaining(pkt) > 0) {
4169 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PROCESS_NEXT_PROTO,
4170 SSL_R_LENGTH_MISMATCH);
4171 return MSG_PROCESS_ERROR;
4172 }
4173
4174 if (!PACKET_memdup(&next_proto, &s->ext.npn, &next_proto_len)) {
4175 s->ext.npn_len = 0;
4176 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_NEXT_PROTO,
4177 ERR_R_INTERNAL_ERROR);
4178 return MSG_PROCESS_ERROR;
4179 }
4180
4181 s->ext.npn_len = (unsigned char)next_proto_len;
4182
4183 return MSG_PROCESS_CONTINUE_READING;
4184}
4185#endif
4186
4187static int tls_construct_encrypted_extensions(SSL *s, WPACKET *pkt)
4188{
4189 if (!tls_construct_extensions(s, pkt, SSL_EXT_TLS1_3_ENCRYPTED_EXTENSIONS,
4190 NULL, 0)) {
4191 /* SSLfatal() already called */
4192 return 0;
4193 }
4194
4195 return 1;
4196}
4197
4198MSG_PROCESS_RETURN tls_process_end_of_early_data(SSL *s, PACKET *pkt)
4199{
4200 if (PACKET_remaining(pkt) != 0) {
4201 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PROCESS_END_OF_EARLY_DATA,
4202 SSL_R_LENGTH_MISMATCH);
4203 return MSG_PROCESS_ERROR;
4204 }
4205
4206 if (s->early_data_state != SSL_EARLY_DATA_READING
4207 && s->early_data_state != SSL_EARLY_DATA_READ_RETRY) {
4208 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_END_OF_EARLY_DATA,
4209 ERR_R_INTERNAL_ERROR);
4210 return MSG_PROCESS_ERROR;
4211 }
4212
4213 /*
4214 * EndOfEarlyData signals a key change so the end of the message must be on
4215 * a record boundary.
4216 */
4217 if (RECORD_LAYER_processed_read_pending(&s->rlayer)) {
4218 SSLfatal(s, SSL_AD_UNEXPECTED_MESSAGE,
4219 SSL_F_TLS_PROCESS_END_OF_EARLY_DATA,
4220 SSL_R_NOT_ON_RECORD_BOUNDARY);
4221 return MSG_PROCESS_ERROR;
4222 }
4223
4224 s->early_data_state = SSL_EARLY_DATA_FINISHED_READING;
4225 if (!s->method->ssl3_enc->change_cipher_state(s,
4226 SSL3_CC_HANDSHAKE | SSL3_CHANGE_CIPHER_SERVER_READ)) {
4227 /* SSLfatal() already called */
4228 return MSG_PROCESS_ERROR;
4229 }
4230
4231 return MSG_PROCESS_CONTINUE_READING;
4232}
4233