1 /* Copyright (c) 2016, Google Inc.
2 *
3 * Permission to use, copy, modify, and/or distribute this software for any
4 * purpose with or without fee is hereby granted, provided that the above
5 * copyright notice and this permission notice appear in all copies.
6 *
7 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
8 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
9 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
10 * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
11 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
12 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
13 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
14
15 #include <openssl/ssl.h>
16
17 #include <assert.h>
18 #include <string.h>
19
20 #include <openssl/bytestring.h>
21 #include <openssl/err.h>
22 #include <openssl/hkdf.h>
23 #include <openssl/mem.h>
24 #include <openssl/stack.h>
25 #include <openssl/x509.h>
26
27 #include "../crypto/internal.h"
28 #include "internal.h"
29
30
31 /* kMaxKeyUpdates is the number of consecutive KeyUpdates that will be
32 * processed. Without this limit an attacker could force unbounded processing
33 * without being able to return application data. */
34 static const uint8_t kMaxKeyUpdates = 32;
35
tls13_handshake(SSL_HANDSHAKE * hs,int * out_early_return)36 int tls13_handshake(SSL_HANDSHAKE *hs, int *out_early_return) {
37 SSL *const ssl = hs->ssl;
38 for (;;) {
39 /* Resolve the operation the handshake was waiting on. */
40 switch (hs->wait) {
41 case ssl_hs_error:
42 OPENSSL_PUT_ERROR(SSL, SSL_R_SSL_HANDSHAKE_FAILURE);
43 return -1;
44
45 case ssl_hs_flush:
46 case ssl_hs_flush_and_read_message: {
47 int ret = ssl->method->flush_flight(ssl);
48 if (ret <= 0) {
49 return ret;
50 }
51 if (hs->wait != ssl_hs_flush_and_read_message) {
52 break;
53 }
54 ssl->method->expect_flight(ssl);
55 hs->wait = ssl_hs_read_message;
56 /* Fall-through. */
57 }
58
59 case ssl_hs_read_message: {
60 int ret = ssl->method->ssl_get_message(ssl);
61 if (ret <= 0) {
62 return ret;
63 }
64 break;
65 }
66
67 case ssl_hs_read_end_of_early_data: {
68 if (ssl->s3->hs->can_early_read) {
69 /* While we are processing early data, the handshake returns early. */
70 *out_early_return = 1;
71 return 1;
72 }
73 hs->wait = ssl_hs_ok;
74 break;
75 }
76
77 case ssl_hs_x509_lookup:
78 ssl->rwstate = SSL_X509_LOOKUP;
79 hs->wait = ssl_hs_ok;
80 return -1;
81
82 case ssl_hs_channel_id_lookup:
83 ssl->rwstate = SSL_CHANNEL_ID_LOOKUP;
84 hs->wait = ssl_hs_ok;
85 return -1;
86
87 case ssl_hs_private_key_operation:
88 ssl->rwstate = SSL_PRIVATE_KEY_OPERATION;
89 hs->wait = ssl_hs_ok;
90 return -1;
91
92 case ssl_hs_pending_ticket:
93 ssl->rwstate = SSL_PENDING_TICKET;
94 hs->wait = ssl_hs_ok;
95 return -1;
96
97 case ssl_hs_ok:
98 break;
99 }
100
101 /* Run the state machine again. */
102 hs->wait = hs->do_tls13_handshake(hs);
103 if (hs->wait == ssl_hs_error) {
104 /* Don't loop around to avoid a stray |SSL_R_SSL_HANDSHAKE_FAILURE| the
105 * first time around. */
106 return -1;
107 }
108 if (hs->wait == ssl_hs_ok) {
109 /* The handshake has completed. */
110 return 1;
111 }
112
113 /* Otherwise, loop to the beginning and resolve what was blocking the
114 * handshake. */
115 }
116 }
117
tls13_get_cert_verify_signature_input(SSL_HANDSHAKE * hs,uint8_t ** out,size_t * out_len,enum ssl_cert_verify_context_t cert_verify_context)118 int tls13_get_cert_verify_signature_input(
119 SSL_HANDSHAKE *hs, uint8_t **out, size_t *out_len,
120 enum ssl_cert_verify_context_t cert_verify_context) {
121 CBB cbb;
122 if (!CBB_init(&cbb, 64 + 33 + 1 + 2 * EVP_MAX_MD_SIZE)) {
123 goto err;
124 }
125
126 for (size_t i = 0; i < 64; i++) {
127 if (!CBB_add_u8(&cbb, 0x20)) {
128 goto err;
129 }
130 }
131
132 const uint8_t *context;
133 size_t context_len;
134 if (cert_verify_context == ssl_cert_verify_server) {
135 /* Include the NUL byte. */
136 static const char kContext[] = "TLS 1.3, server CertificateVerify";
137 context = (const uint8_t *)kContext;
138 context_len = sizeof(kContext);
139 } else if (cert_verify_context == ssl_cert_verify_client) {
140 static const char kContext[] = "TLS 1.3, client CertificateVerify";
141 context = (const uint8_t *)kContext;
142 context_len = sizeof(kContext);
143 } else if (cert_verify_context == ssl_cert_verify_channel_id) {
144 static const char kContext[] = "TLS 1.3, Channel ID";
145 context = (const uint8_t *)kContext;
146 context_len = sizeof(kContext);
147 } else {
148 goto err;
149 }
150
151 if (!CBB_add_bytes(&cbb, context, context_len)) {
152 goto err;
153 }
154
155 uint8_t context_hash[EVP_MAX_MD_SIZE];
156 size_t context_hash_len;
157 if (!SSL_TRANSCRIPT_get_hash(&hs->transcript, context_hash,
158 &context_hash_len) ||
159 !CBB_add_bytes(&cbb, context_hash, context_hash_len) ||
160 !CBB_finish(&cbb, out, out_len)) {
161 goto err;
162 }
163
164 return 1;
165
166 err:
167 OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE);
168 CBB_cleanup(&cbb);
169 return 0;
170 }
171
tls13_process_certificate(SSL_HANDSHAKE * hs,int allow_anonymous)172 int tls13_process_certificate(SSL_HANDSHAKE *hs, int allow_anonymous) {
173 SSL *const ssl = hs->ssl;
174 CBS cbs, context, certificate_list;
175 CBS_init(&cbs, ssl->init_msg, ssl->init_num);
176 if (!CBS_get_u8_length_prefixed(&cbs, &context) ||
177 CBS_len(&context) != 0) {
178 ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
179 OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR);
180 return 0;
181 }
182
183 const int retain_sha256 =
184 ssl->server && ssl->retain_only_sha256_of_client_certs;
185 int ret = 0;
186
187 EVP_PKEY *pkey = NULL;
188 STACK_OF(CRYPTO_BUFFER) *certs = sk_CRYPTO_BUFFER_new_null();
189 if (certs == NULL) {
190 ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
191 OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE);
192 goto err;
193 }
194
195 if (!CBS_get_u24_length_prefixed(&cbs, &certificate_list)) {
196 ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
197 OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR);
198 goto err;
199 }
200
201 while (CBS_len(&certificate_list) > 0) {
202 CBS certificate, extensions;
203 if (!CBS_get_u24_length_prefixed(&certificate_list, &certificate) ||
204 !CBS_get_u16_length_prefixed(&certificate_list, &extensions) ||
205 CBS_len(&certificate) == 0) {
206 ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
207 OPENSSL_PUT_ERROR(SSL, SSL_R_CERT_LENGTH_MISMATCH);
208 goto err;
209 }
210
211 if (sk_CRYPTO_BUFFER_num(certs) == 0) {
212 pkey = ssl_cert_parse_pubkey(&certificate);
213 if (pkey == NULL) {
214 ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
215 OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR);
216 goto err;
217 }
218 /* TLS 1.3 always uses certificate keys for signing thus the correct
219 * keyUsage is enforced. */
220 if (!ssl_cert_check_digital_signature_key_usage(&certificate)) {
221 ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_ILLEGAL_PARAMETER);
222 goto err;
223 }
224
225 if (retain_sha256) {
226 /* Retain the hash of the leaf certificate if requested. */
227 SHA256(CBS_data(&certificate), CBS_len(&certificate),
228 hs->new_session->peer_sha256);
229 }
230 }
231
232 CRYPTO_BUFFER *buf =
233 CRYPTO_BUFFER_new_from_CBS(&certificate, ssl->ctx->pool);
234 if (buf == NULL ||
235 !sk_CRYPTO_BUFFER_push(certs, buf)) {
236 CRYPTO_BUFFER_free(buf);
237 ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
238 OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE);
239 goto err;
240 }
241
242 /* Parse out the extensions. */
243 int have_status_request = 0, have_sct = 0;
244 CBS status_request, sct;
245 const SSL_EXTENSION_TYPE ext_types[] = {
246 {TLSEXT_TYPE_status_request, &have_status_request, &status_request},
247 {TLSEXT_TYPE_certificate_timestamp, &have_sct, &sct},
248 };
249
250 uint8_t alert = SSL_AD_DECODE_ERROR;
251 if (!ssl_parse_extensions(&extensions, &alert, ext_types,
252 OPENSSL_ARRAY_SIZE(ext_types),
253 0 /* reject unknown */)) {
254 ssl3_send_alert(ssl, SSL3_AL_FATAL, alert);
255 goto err;
256 }
257
258 /* All Certificate extensions are parsed, but only the leaf extensions are
259 * stored. */
260 if (have_status_request) {
261 if (ssl->server || !ssl->ocsp_stapling_enabled) {
262 OPENSSL_PUT_ERROR(SSL, SSL_R_UNEXPECTED_EXTENSION);
263 ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_UNSUPPORTED_EXTENSION);
264 goto err;
265 }
266
267 uint8_t status_type;
268 CBS ocsp_response;
269 if (!CBS_get_u8(&status_request, &status_type) ||
270 status_type != TLSEXT_STATUSTYPE_ocsp ||
271 !CBS_get_u24_length_prefixed(&status_request, &ocsp_response) ||
272 CBS_len(&ocsp_response) == 0 ||
273 CBS_len(&status_request) != 0) {
274 ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
275 goto err;
276 }
277
278 if (sk_CRYPTO_BUFFER_num(certs) == 1 &&
279 !CBS_stow(&ocsp_response, &hs->new_session->ocsp_response,
280 &hs->new_session->ocsp_response_length)) {
281 ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
282 goto err;
283 }
284 }
285
286 if (have_sct) {
287 if (ssl->server || !ssl->signed_cert_timestamps_enabled) {
288 OPENSSL_PUT_ERROR(SSL, SSL_R_UNEXPECTED_EXTENSION);
289 ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_UNSUPPORTED_EXTENSION);
290 goto err;
291 }
292
293 if (!ssl_is_sct_list_valid(&sct)) {
294 OPENSSL_PUT_ERROR(SSL, SSL_R_ERROR_PARSING_EXTENSION);
295 ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
296 goto err;
297 }
298
299 if (sk_CRYPTO_BUFFER_num(certs) == 1 &&
300 !CBS_stow(
301 &sct, &hs->new_session->tlsext_signed_cert_timestamp_list,
302 &hs->new_session->tlsext_signed_cert_timestamp_list_length)) {
303 ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
304 goto err;
305 }
306 }
307 }
308
309 if (CBS_len(&cbs) != 0) {
310 OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR);
311 ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
312 goto err;
313 }
314
315 EVP_PKEY_free(hs->peer_pubkey);
316 hs->peer_pubkey = pkey;
317 pkey = NULL;
318
319 sk_CRYPTO_BUFFER_pop_free(hs->new_session->certs, CRYPTO_BUFFER_free);
320 hs->new_session->certs = certs;
321 certs = NULL;
322
323 if (!ssl->ctx->x509_method->session_cache_objects(hs->new_session)) {
324 OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR);
325 ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
326 goto err;
327 }
328
329 if (sk_CRYPTO_BUFFER_num(hs->new_session->certs) == 0) {
330 if (!allow_anonymous) {
331 OPENSSL_PUT_ERROR(SSL, SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
332 ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_CERTIFICATE_REQUIRED);
333 goto err;
334 }
335
336 /* OpenSSL returns X509_V_OK when no certificates are requested. This is
337 * classed by them as a bug, but it's assumed by at least NGINX. */
338 hs->new_session->verify_result = X509_V_OK;
339
340 /* No certificate, so nothing more to do. */
341 ret = 1;
342 goto err;
343 }
344
345 hs->new_session->peer_sha256_valid = retain_sha256;
346
347 if (!ssl->ctx->x509_method->session_verify_cert_chain(hs->new_session,
348 ssl)) {
349 goto err;
350 }
351
352 ret = 1;
353
354 err:
355 sk_CRYPTO_BUFFER_pop_free(certs, CRYPTO_BUFFER_free);
356 EVP_PKEY_free(pkey);
357 return ret;
358 }
359
tls13_process_certificate_verify(SSL_HANDSHAKE * hs)360 int tls13_process_certificate_verify(SSL_HANDSHAKE *hs) {
361 SSL *const ssl = hs->ssl;
362 int ret = 0;
363 uint8_t *msg = NULL;
364 size_t msg_len;
365
366 if (hs->peer_pubkey == NULL) {
367 goto err;
368 }
369
370 CBS cbs, signature;
371 uint16_t signature_algorithm;
372 CBS_init(&cbs, ssl->init_msg, ssl->init_num);
373 if (!CBS_get_u16(&cbs, &signature_algorithm) ||
374 !CBS_get_u16_length_prefixed(&cbs, &signature) ||
375 CBS_len(&cbs) != 0) {
376 OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR);
377 ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
378 goto err;
379 }
380
381 int al;
382 if (!tls12_check_peer_sigalg(ssl, &al, signature_algorithm)) {
383 ssl3_send_alert(ssl, SSL3_AL_FATAL, al);
384 goto err;
385 }
386 hs->new_session->peer_signature_algorithm = signature_algorithm;
387
388 if (!tls13_get_cert_verify_signature_input(
389 hs, &msg, &msg_len,
390 ssl->server ? ssl_cert_verify_client : ssl_cert_verify_server)) {
391 ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
392 goto err;
393 }
394
395 int sig_ok =
396 ssl_public_key_verify(ssl, CBS_data(&signature), CBS_len(&signature),
397 signature_algorithm, hs->peer_pubkey, msg, msg_len);
398 #if defined(BORINGSSL_UNSAFE_FUZZER_MODE)
399 sig_ok = 1;
400 ERR_clear_error();
401 #endif
402 if (!sig_ok) {
403 OPENSSL_PUT_ERROR(SSL, SSL_R_BAD_SIGNATURE);
404 ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECRYPT_ERROR);
405 goto err;
406 }
407
408 ret = 1;
409
410 err:
411 OPENSSL_free(msg);
412 return ret;
413 }
414
tls13_process_finished(SSL_HANDSHAKE * hs,int use_saved_value)415 int tls13_process_finished(SSL_HANDSHAKE *hs, int use_saved_value) {
416 SSL *const ssl = hs->ssl;
417 uint8_t verify_data_buf[EVP_MAX_MD_SIZE];
418 const uint8_t *verify_data;
419 size_t verify_data_len;
420 if (use_saved_value) {
421 assert(ssl->server);
422 verify_data = hs->expected_client_finished;
423 verify_data_len = hs->hash_len;
424 } else {
425 if (!tls13_finished_mac(hs, verify_data_buf, &verify_data_len,
426 !ssl->server)) {
427 return 0;
428 }
429 verify_data = verify_data_buf;
430 }
431
432 int finished_ok =
433 ssl->init_num == verify_data_len &&
434 CRYPTO_memcmp(verify_data, ssl->init_msg, verify_data_len) == 0;
435 #if defined(BORINGSSL_UNSAFE_FUZZER_MODE)
436 finished_ok = 1;
437 #endif
438 if (!finished_ok) {
439 ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECRYPT_ERROR);
440 OPENSSL_PUT_ERROR(SSL, SSL_R_DIGEST_CHECK_FAILED);
441 return 0;
442 }
443
444 return 1;
445 }
446
tls13_add_certificate(SSL_HANDSHAKE * hs)447 int tls13_add_certificate(SSL_HANDSHAKE *hs) {
448 SSL *const ssl = hs->ssl;
449 CBB cbb, body, certificate_list;
450 if (!ssl->method->init_message(ssl, &cbb, &body, SSL3_MT_CERTIFICATE) ||
451 /* The request context is always empty in the handshake. */
452 !CBB_add_u8(&body, 0) ||
453 !CBB_add_u24_length_prefixed(&body, &certificate_list)) {
454 OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR);
455 goto err;
456 }
457
458 if (!ssl_has_certificate(ssl)) {
459 if (!ssl_add_message_cbb(ssl, &cbb)) {
460 goto err;
461 }
462
463 return 1;
464 }
465
466 CERT *cert = ssl->cert;
467 CRYPTO_BUFFER *leaf_buf = sk_CRYPTO_BUFFER_value(cert->chain, 0);
468 CBB leaf, extensions;
469 if (!CBB_add_u24_length_prefixed(&certificate_list, &leaf) ||
470 !CBB_add_bytes(&leaf, CRYPTO_BUFFER_data(leaf_buf),
471 CRYPTO_BUFFER_len(leaf_buf)) ||
472 !CBB_add_u16_length_prefixed(&certificate_list, &extensions)) {
473 OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR);
474 goto err;
475 }
476
477 if (hs->scts_requested && ssl->cert->signed_cert_timestamp_list != NULL) {
478 CBB contents;
479 if (!CBB_add_u16(&extensions, TLSEXT_TYPE_certificate_timestamp) ||
480 !CBB_add_u16_length_prefixed(&extensions, &contents) ||
481 !CBB_add_bytes(
482 &contents,
483 CRYPTO_BUFFER_data(ssl->cert->signed_cert_timestamp_list),
484 CRYPTO_BUFFER_len(ssl->cert->signed_cert_timestamp_list)) ||
485 !CBB_flush(&extensions)) {
486 OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR);
487 goto err;
488 }
489 }
490
491 if (hs->ocsp_stapling_requested &&
492 ssl->cert->ocsp_response != NULL) {
493 CBB contents, ocsp_response;
494 if (!CBB_add_u16(&extensions, TLSEXT_TYPE_status_request) ||
495 !CBB_add_u16_length_prefixed(&extensions, &contents) ||
496 !CBB_add_u8(&contents, TLSEXT_STATUSTYPE_ocsp) ||
497 !CBB_add_u24_length_prefixed(&contents, &ocsp_response) ||
498 !CBB_add_bytes(&ocsp_response,
499 CRYPTO_BUFFER_data(ssl->cert->ocsp_response),
500 CRYPTO_BUFFER_len(ssl->cert->ocsp_response)) ||
501 !CBB_flush(&extensions)) {
502 OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR);
503 goto err;
504 }
505 }
506
507 for (size_t i = 1; i < sk_CRYPTO_BUFFER_num(cert->chain); i++) {
508 CRYPTO_BUFFER *cert_buf = sk_CRYPTO_BUFFER_value(cert->chain, i);
509 CBB child;
510 if (!CBB_add_u24_length_prefixed(&certificate_list, &child) ||
511 !CBB_add_bytes(&child, CRYPTO_BUFFER_data(cert_buf),
512 CRYPTO_BUFFER_len(cert_buf)) ||
513 !CBB_add_u16(&certificate_list, 0 /* no extensions */)) {
514 OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR);
515 goto err;
516 }
517 }
518
519 if (!ssl_add_message_cbb(ssl, &cbb)) {
520 goto err;
521 }
522
523 return 1;
524
525 err:
526 CBB_cleanup(&cbb);
527 return 0;
528 }
529
tls13_add_certificate_verify(SSL_HANDSHAKE * hs,int is_first_run)530 enum ssl_private_key_result_t tls13_add_certificate_verify(SSL_HANDSHAKE *hs,
531 int is_first_run) {
532 SSL *const ssl = hs->ssl;
533 enum ssl_private_key_result_t ret = ssl_private_key_failure;
534 uint8_t *msg = NULL;
535 size_t msg_len;
536 CBB cbb, body;
537 CBB_zero(&cbb);
538
539 uint16_t signature_algorithm;
540 if (!tls1_choose_signature_algorithm(hs, &signature_algorithm)) {
541 goto err;
542 }
543 if (!ssl->method->init_message(ssl, &cbb, &body,
544 SSL3_MT_CERTIFICATE_VERIFY) ||
545 !CBB_add_u16(&body, signature_algorithm)) {
546 OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR);
547 goto err;
548 }
549
550 /* Sign the digest. */
551 CBB child;
552 const size_t max_sig_len = ssl_private_key_max_signature_len(ssl);
553 uint8_t *sig;
554 size_t sig_len;
555 if (!CBB_add_u16_length_prefixed(&body, &child) ||
556 !CBB_reserve(&child, &sig, max_sig_len)) {
557 ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
558 goto err;
559 }
560
561 enum ssl_private_key_result_t sign_result;
562 if (is_first_run) {
563 if (!tls13_get_cert_verify_signature_input(
564 hs, &msg, &msg_len,
565 ssl->server ? ssl_cert_verify_server : ssl_cert_verify_client)) {
566 ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
567 goto err;
568 }
569 sign_result = ssl_private_key_sign(ssl, sig, &sig_len, max_sig_len,
570 signature_algorithm, msg, msg_len);
571 } else {
572 sign_result = ssl_private_key_complete(ssl, sig, &sig_len, max_sig_len);
573 }
574
575 if (sign_result != ssl_private_key_success) {
576 ret = sign_result;
577 goto err;
578 }
579
580 if (!CBB_did_write(&child, sig_len) ||
581 !ssl_add_message_cbb(ssl, &cbb)) {
582 goto err;
583 }
584
585 ret = ssl_private_key_success;
586
587 err:
588 CBB_cleanup(&cbb);
589 OPENSSL_free(msg);
590 return ret;
591 }
592
tls13_add_finished(SSL_HANDSHAKE * hs)593 int tls13_add_finished(SSL_HANDSHAKE *hs) {
594 SSL *const ssl = hs->ssl;
595 size_t verify_data_len;
596 uint8_t verify_data[EVP_MAX_MD_SIZE];
597
598 if (!tls13_finished_mac(hs, verify_data, &verify_data_len, ssl->server)) {
599 ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
600 OPENSSL_PUT_ERROR(SSL, SSL_R_DIGEST_CHECK_FAILED);
601 return 0;
602 }
603
604 CBB cbb, body;
605 if (!ssl->method->init_message(ssl, &cbb, &body, SSL3_MT_FINISHED) ||
606 !CBB_add_bytes(&body, verify_data, verify_data_len) ||
607 !ssl_add_message_cbb(ssl, &cbb)) {
608 CBB_cleanup(&cbb);
609 return 0;
610 }
611
612 return 1;
613 }
614
tls13_receive_key_update(SSL * ssl)615 static int tls13_receive_key_update(SSL *ssl) {
616 CBS cbs;
617 uint8_t key_update_request;
618 CBS_init(&cbs, ssl->init_msg, ssl->init_num);
619 if (!CBS_get_u8(&cbs, &key_update_request) ||
620 CBS_len(&cbs) != 0 ||
621 (key_update_request != SSL_KEY_UPDATE_NOT_REQUESTED &&
622 key_update_request != SSL_KEY_UPDATE_REQUESTED)) {
623 OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR);
624 ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
625 return 0;
626 }
627
628 /* TODO(svaldez): Send KeyUpdate if |key_update_request| is
629 * |SSL_KEY_UPDATE_REQUESTED|. */
630 return tls13_rotate_traffic_key(ssl, evp_aead_open);
631 }
632
tls13_post_handshake(SSL * ssl)633 int tls13_post_handshake(SSL *ssl) {
634 if (ssl->s3->tmp.message_type == SSL3_MT_KEY_UPDATE) {
635 ssl->s3->key_update_count++;
636 if (ssl->s3->key_update_count > kMaxKeyUpdates) {
637 OPENSSL_PUT_ERROR(SSL, SSL_R_TOO_MANY_KEY_UPDATES);
638 ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE);
639 return 0;
640 }
641
642 return tls13_receive_key_update(ssl);
643 }
644
645 ssl->s3->key_update_count = 0;
646
647 if (ssl->s3->tmp.message_type == SSL3_MT_NEW_SESSION_TICKET &&
648 !ssl->server) {
649 return tls13_process_new_session_ticket(ssl);
650 }
651
652 // TODO(svaldez): Handle post-handshake authentication.
653
654 ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE);
655 OPENSSL_PUT_ERROR(SSL, SSL_R_UNEXPECTED_MESSAGE);
656 return 0;
657 }
658