1 /*
2 * Copyright 2016-2019 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the OpenSSL license (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
8 */
9
10 #include <openssl/ocsp.h>
11 #include "../ssl_locl.h"
12 #include "statem_locl.h"
13 #include "internal/cryptlib.h"
14
15 #define COOKIE_STATE_FORMAT_VERSION 0
16
17 /*
18 * 2 bytes for packet length, 2 bytes for format version, 2 bytes for
19 * protocol version, 2 bytes for group id, 2 bytes for cipher id, 1 byte for
20 * key_share present flag, 4 bytes for timestamp, 2 bytes for the hashlen,
21 * EVP_MAX_MD_SIZE for transcript hash, 1 byte for app cookie length, app cookie
22 * length bytes, SHA256_DIGEST_LENGTH bytes for the HMAC of the whole thing.
23 */
24 #define MAX_COOKIE_SIZE (2 + 2 + 2 + 2 + 2 + 1 + 4 + 2 + EVP_MAX_MD_SIZE + 1 \
25 + SSL_COOKIE_LENGTH + SHA256_DIGEST_LENGTH)
26
27 /*
28 * Message header + 2 bytes for protocol version + number of random bytes +
29 * + 1 byte for legacy session id length + number of bytes in legacy session id
30 * + 2 bytes for ciphersuite + 1 byte for legacy compression
31 * + 2 bytes for extension block length + 6 bytes for key_share extension
32 * + 4 bytes for cookie extension header + the number of bytes in the cookie
33 */
34 #define MAX_HRR_SIZE (SSL3_HM_HEADER_LENGTH + 2 + SSL3_RANDOM_SIZE + 1 \
35 + SSL_MAX_SSL_SESSION_ID_LENGTH + 2 + 1 + 2 + 6 + 4 \
36 + MAX_COOKIE_SIZE)
37
38 /*
39 * Parse the client's renegotiation binding and abort if it's not right
40 */
tls_parse_ctos_renegotiate(SSL * s,PACKET * pkt,unsigned int context,X509 * x,size_t chainidx)41 int tls_parse_ctos_renegotiate(SSL *s, PACKET *pkt, unsigned int context,
42 X509 *x, size_t chainidx)
43 {
44 unsigned int ilen;
45 const unsigned char *data;
46
47 /* Parse the length byte */
48 if (!PACKET_get_1(pkt, &ilen)
49 || !PACKET_get_bytes(pkt, &data, ilen)) {
50 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PARSE_CTOS_RENEGOTIATE,
51 SSL_R_RENEGOTIATION_ENCODING_ERR);
52 return 0;
53 }
54
55 /* Check that the extension matches */
56 if (ilen != s->s3->previous_client_finished_len) {
57 SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE, SSL_F_TLS_PARSE_CTOS_RENEGOTIATE,
58 SSL_R_RENEGOTIATION_MISMATCH);
59 return 0;
60 }
61
62 if (memcmp(data, s->s3->previous_client_finished,
63 s->s3->previous_client_finished_len)) {
64 SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE, SSL_F_TLS_PARSE_CTOS_RENEGOTIATE,
65 SSL_R_RENEGOTIATION_MISMATCH);
66 return 0;
67 }
68
69 s->s3->send_connection_binding = 1;
70
71 return 1;
72 }
73
74 /*-
75 * The servername extension is treated as follows:
76 *
77 * - Only the hostname type is supported with a maximum length of 255.
78 * - The servername is rejected if too long or if it contains zeros,
79 * in which case an fatal alert is generated.
80 * - The servername field is maintained together with the session cache.
81 * - When a session is resumed, the servername call back invoked in order
82 * to allow the application to position itself to the right context.
83 * - The servername is acknowledged if it is new for a session or when
84 * it is identical to a previously used for the same session.
85 * Applications can control the behaviour. They can at any time
86 * set a 'desirable' servername for a new SSL object. This can be the
87 * case for example with HTTPS when a Host: header field is received and
88 * a renegotiation is requested. In this case, a possible servername
89 * presented in the new client hello is only acknowledged if it matches
90 * the value of the Host: field.
91 * - Applications must use SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION
92 * if they provide for changing an explicit servername context for the
93 * session, i.e. when the session has been established with a servername
94 * extension.
95 * - On session reconnect, the servername extension may be absent.
96 */
tls_parse_ctos_server_name(SSL * s,PACKET * pkt,unsigned int context,X509 * x,size_t chainidx)97 int tls_parse_ctos_server_name(SSL *s, PACKET *pkt, unsigned int context,
98 X509 *x, size_t chainidx)
99 {
100 unsigned int servname_type;
101 PACKET sni, hostname;
102
103 if (!PACKET_as_length_prefixed_2(pkt, &sni)
104 /* ServerNameList must be at least 1 byte long. */
105 || PACKET_remaining(&sni) == 0) {
106 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PARSE_CTOS_SERVER_NAME,
107 SSL_R_BAD_EXTENSION);
108 return 0;
109 }
110
111 /*
112 * Although the intent was for server_name to be extensible, RFC 4366
113 * was not clear about it; and so OpenSSL among other implementations,
114 * always and only allows a 'host_name' name types.
115 * RFC 6066 corrected the mistake but adding new name types
116 * is nevertheless no longer feasible, so act as if no other
117 * SNI types can exist, to simplify parsing.
118 *
119 * Also note that the RFC permits only one SNI value per type,
120 * i.e., we can only have a single hostname.
121 */
122 if (!PACKET_get_1(&sni, &servname_type)
123 || servname_type != TLSEXT_NAMETYPE_host_name
124 || !PACKET_as_length_prefixed_2(&sni, &hostname)) {
125 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PARSE_CTOS_SERVER_NAME,
126 SSL_R_BAD_EXTENSION);
127 return 0;
128 }
129
130 if (!s->hit || SSL_IS_TLS13(s)) {
131 if (PACKET_remaining(&hostname) > TLSEXT_MAXLEN_host_name) {
132 SSLfatal(s, SSL_AD_UNRECOGNIZED_NAME,
133 SSL_F_TLS_PARSE_CTOS_SERVER_NAME,
134 SSL_R_BAD_EXTENSION);
135 return 0;
136 }
137
138 if (PACKET_contains_zero_byte(&hostname)) {
139 SSLfatal(s, SSL_AD_UNRECOGNIZED_NAME,
140 SSL_F_TLS_PARSE_CTOS_SERVER_NAME,
141 SSL_R_BAD_EXTENSION);
142 return 0;
143 }
144
145 /*
146 * Store the requested SNI in the SSL as temporary storage.
147 * If we accept it, it will get stored in the SSL_SESSION as well.
148 */
149 OPENSSL_free(s->ext.hostname);
150 s->ext.hostname = NULL;
151 if (!PACKET_strndup(&hostname, &s->ext.hostname)) {
152 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PARSE_CTOS_SERVER_NAME,
153 ERR_R_INTERNAL_ERROR);
154 return 0;
155 }
156
157 s->servername_done = 1;
158 }
159 if (s->hit) {
160 /*
161 * TODO(openssl-team): if the SNI doesn't match, we MUST
162 * fall back to a full handshake.
163 */
164 s->servername_done = (s->session->ext.hostname != NULL)
165 && PACKET_equal(&hostname, s->session->ext.hostname,
166 strlen(s->session->ext.hostname));
167
168 if (!s->servername_done && s->session->ext.hostname != NULL)
169 s->ext.early_data_ok = 0;
170 }
171
172 return 1;
173 }
174
tls_parse_ctos_maxfragmentlen(SSL * s,PACKET * pkt,unsigned int context,X509 * x,size_t chainidx)175 int tls_parse_ctos_maxfragmentlen(SSL *s, PACKET *pkt, unsigned int context,
176 X509 *x, size_t chainidx)
177 {
178 unsigned int value;
179
180 if (PACKET_remaining(pkt) != 1 || !PACKET_get_1(pkt, &value)) {
181 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PARSE_CTOS_MAXFRAGMENTLEN,
182 SSL_R_BAD_EXTENSION);
183 return 0;
184 }
185
186 /* Received |value| should be a valid max-fragment-length code. */
187 if (!IS_MAX_FRAGMENT_LENGTH_EXT_VALID(value)) {
188 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER,
189 SSL_F_TLS_PARSE_CTOS_MAXFRAGMENTLEN,
190 SSL_R_SSL3_EXT_INVALID_MAX_FRAGMENT_LENGTH);
191 return 0;
192 }
193
194 /*
195 * RFC 6066: The negotiated length applies for the duration of the session
196 * including session resumptions.
197 * We should receive the same code as in resumed session !
198 */
199 if (s->hit && s->session->ext.max_fragment_len_mode != value) {
200 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER,
201 SSL_F_TLS_PARSE_CTOS_MAXFRAGMENTLEN,
202 SSL_R_SSL3_EXT_INVALID_MAX_FRAGMENT_LENGTH);
203 return 0;
204 }
205
206 /*
207 * Store it in session, so it'll become binding for us
208 * and we'll include it in a next Server Hello.
209 */
210 s->session->ext.max_fragment_len_mode = value;
211 return 1;
212 }
213
214 #ifndef OPENSSL_NO_SRP
tls_parse_ctos_srp(SSL * s,PACKET * pkt,unsigned int context,X509 * x,size_t chainidx)215 int tls_parse_ctos_srp(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
216 size_t chainidx)
217 {
218 PACKET srp_I;
219
220 if (!PACKET_as_length_prefixed_1(pkt, &srp_I)
221 || PACKET_contains_zero_byte(&srp_I)) {
222 SSLfatal(s, SSL_AD_DECODE_ERROR,
223 SSL_F_TLS_PARSE_CTOS_SRP,
224 SSL_R_BAD_EXTENSION);
225 return 0;
226 }
227
228 /*
229 * TODO(openssl-team): currently, we re-authenticate the user
230 * upon resumption. Instead, we MUST ignore the login.
231 */
232 if (!PACKET_strndup(&srp_I, &s->srp_ctx.login)) {
233 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PARSE_CTOS_SRP,
234 ERR_R_INTERNAL_ERROR);
235 return 0;
236 }
237
238 return 1;
239 }
240 #endif
241
242 #ifndef OPENSSL_NO_EC
tls_parse_ctos_ec_pt_formats(SSL * s,PACKET * pkt,unsigned int context,X509 * x,size_t chainidx)243 int tls_parse_ctos_ec_pt_formats(SSL *s, PACKET *pkt, unsigned int context,
244 X509 *x, size_t chainidx)
245 {
246 PACKET ec_point_format_list;
247
248 if (!PACKET_as_length_prefixed_1(pkt, &ec_point_format_list)
249 || PACKET_remaining(&ec_point_format_list) == 0) {
250 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PARSE_CTOS_EC_PT_FORMATS,
251 SSL_R_BAD_EXTENSION);
252 return 0;
253 }
254
255 if (!s->hit) {
256 if (!PACKET_memdup(&ec_point_format_list,
257 &s->ext.peer_ecpointformats,
258 &s->ext.peer_ecpointformats_len)) {
259 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
260 SSL_F_TLS_PARSE_CTOS_EC_PT_FORMATS, ERR_R_INTERNAL_ERROR);
261 return 0;
262 }
263 }
264
265 return 1;
266 }
267 #endif /* OPENSSL_NO_EC */
268
tls_parse_ctos_session_ticket(SSL * s,PACKET * pkt,unsigned int context,X509 * x,size_t chainidx)269 int tls_parse_ctos_session_ticket(SSL *s, PACKET *pkt, unsigned int context,
270 X509 *x, size_t chainidx)
271 {
272 if (s->ext.session_ticket_cb &&
273 !s->ext.session_ticket_cb(s, PACKET_data(pkt),
274 PACKET_remaining(pkt),
275 s->ext.session_ticket_cb_arg)) {
276 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
277 SSL_F_TLS_PARSE_CTOS_SESSION_TICKET, ERR_R_INTERNAL_ERROR);
278 return 0;
279 }
280
281 return 1;
282 }
283
tls_parse_ctos_sig_algs_cert(SSL * s,PACKET * pkt,unsigned int context,X509 * x,size_t chainidx)284 int tls_parse_ctos_sig_algs_cert(SSL *s, PACKET *pkt, unsigned int context,
285 X509 *x, size_t chainidx)
286 {
287 PACKET supported_sig_algs;
288
289 if (!PACKET_as_length_prefixed_2(pkt, &supported_sig_algs)
290 || PACKET_remaining(&supported_sig_algs) == 0) {
291 SSLfatal(s, SSL_AD_DECODE_ERROR,
292 SSL_F_TLS_PARSE_CTOS_SIG_ALGS_CERT, SSL_R_BAD_EXTENSION);
293 return 0;
294 }
295
296 if (!s->hit && !tls1_save_sigalgs(s, &supported_sig_algs, 1)) {
297 SSLfatal(s, SSL_AD_DECODE_ERROR,
298 SSL_F_TLS_PARSE_CTOS_SIG_ALGS_CERT, SSL_R_BAD_EXTENSION);
299 return 0;
300 }
301
302 return 1;
303 }
304
tls_parse_ctos_sig_algs(SSL * s,PACKET * pkt,unsigned int context,X509 * x,size_t chainidx)305 int tls_parse_ctos_sig_algs(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
306 size_t chainidx)
307 {
308 PACKET supported_sig_algs;
309
310 if (!PACKET_as_length_prefixed_2(pkt, &supported_sig_algs)
311 || PACKET_remaining(&supported_sig_algs) == 0) {
312 SSLfatal(s, SSL_AD_DECODE_ERROR,
313 SSL_F_TLS_PARSE_CTOS_SIG_ALGS, SSL_R_BAD_EXTENSION);
314 return 0;
315 }
316
317 if (!s->hit && !tls1_save_sigalgs(s, &supported_sig_algs, 0)) {
318 SSLfatal(s, SSL_AD_DECODE_ERROR,
319 SSL_F_TLS_PARSE_CTOS_SIG_ALGS, SSL_R_BAD_EXTENSION);
320 return 0;
321 }
322
323 return 1;
324 }
325
326 #ifndef OPENSSL_NO_OCSP
tls_parse_ctos_status_request(SSL * s,PACKET * pkt,unsigned int context,X509 * x,size_t chainidx)327 int tls_parse_ctos_status_request(SSL *s, PACKET *pkt, unsigned int context,
328 X509 *x, size_t chainidx)
329 {
330 PACKET responder_id_list, exts;
331
332 /* We ignore this in a resumption handshake */
333 if (s->hit)
334 return 1;
335
336 /* Not defined if we get one of these in a client Certificate */
337 if (x != NULL)
338 return 1;
339
340 if (!PACKET_get_1(pkt, (unsigned int *)&s->ext.status_type)) {
341 SSLfatal(s, SSL_AD_DECODE_ERROR,
342 SSL_F_TLS_PARSE_CTOS_STATUS_REQUEST, SSL_R_BAD_EXTENSION);
343 return 0;
344 }
345
346 if (s->ext.status_type != TLSEXT_STATUSTYPE_ocsp) {
347 /*
348 * We don't know what to do with any other type so ignore it.
349 */
350 s->ext.status_type = TLSEXT_STATUSTYPE_nothing;
351 return 1;
352 }
353
354 if (!PACKET_get_length_prefixed_2 (pkt, &responder_id_list)) {
355 SSLfatal(s, SSL_AD_DECODE_ERROR,
356 SSL_F_TLS_PARSE_CTOS_STATUS_REQUEST, SSL_R_BAD_EXTENSION);
357 return 0;
358 }
359
360 /*
361 * We remove any OCSP_RESPIDs from a previous handshake
362 * to prevent unbounded memory growth - CVE-2016-6304
363 */
364 sk_OCSP_RESPID_pop_free(s->ext.ocsp.ids, OCSP_RESPID_free);
365 if (PACKET_remaining(&responder_id_list) > 0) {
366 s->ext.ocsp.ids = sk_OCSP_RESPID_new_null();
367 if (s->ext.ocsp.ids == NULL) {
368 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
369 SSL_F_TLS_PARSE_CTOS_STATUS_REQUEST, ERR_R_MALLOC_FAILURE);
370 return 0;
371 }
372 } else {
373 s->ext.ocsp.ids = NULL;
374 }
375
376 while (PACKET_remaining(&responder_id_list) > 0) {
377 OCSP_RESPID *id;
378 PACKET responder_id;
379 const unsigned char *id_data;
380
381 if (!PACKET_get_length_prefixed_2(&responder_id_list, &responder_id)
382 || PACKET_remaining(&responder_id) == 0) {
383 SSLfatal(s, SSL_AD_DECODE_ERROR,
384 SSL_F_TLS_PARSE_CTOS_STATUS_REQUEST, SSL_R_BAD_EXTENSION);
385 return 0;
386 }
387
388 id_data = PACKET_data(&responder_id);
389 /* TODO(size_t): Convert d2i_* to size_t */
390 id = d2i_OCSP_RESPID(NULL, &id_data,
391 (int)PACKET_remaining(&responder_id));
392 if (id == NULL) {
393 SSLfatal(s, SSL_AD_DECODE_ERROR,
394 SSL_F_TLS_PARSE_CTOS_STATUS_REQUEST, SSL_R_BAD_EXTENSION);
395 return 0;
396 }
397
398 if (id_data != PACKET_end(&responder_id)) {
399 OCSP_RESPID_free(id);
400 SSLfatal(s, SSL_AD_DECODE_ERROR,
401 SSL_F_TLS_PARSE_CTOS_STATUS_REQUEST, SSL_R_BAD_EXTENSION);
402
403 return 0;
404 }
405
406 if (!sk_OCSP_RESPID_push(s->ext.ocsp.ids, id)) {
407 OCSP_RESPID_free(id);
408 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
409 SSL_F_TLS_PARSE_CTOS_STATUS_REQUEST, ERR_R_INTERNAL_ERROR);
410
411 return 0;
412 }
413 }
414
415 /* Read in request_extensions */
416 if (!PACKET_as_length_prefixed_2(pkt, &exts)) {
417 SSLfatal(s, SSL_AD_DECODE_ERROR,
418 SSL_F_TLS_PARSE_CTOS_STATUS_REQUEST, SSL_R_BAD_EXTENSION);
419 return 0;
420 }
421
422 if (PACKET_remaining(&exts) > 0) {
423 const unsigned char *ext_data = PACKET_data(&exts);
424
425 sk_X509_EXTENSION_pop_free(s->ext.ocsp.exts,
426 X509_EXTENSION_free);
427 s->ext.ocsp.exts =
428 d2i_X509_EXTENSIONS(NULL, &ext_data, (int)PACKET_remaining(&exts));
429 if (s->ext.ocsp.exts == NULL || ext_data != PACKET_end(&exts)) {
430 SSLfatal(s, SSL_AD_DECODE_ERROR,
431 SSL_F_TLS_PARSE_CTOS_STATUS_REQUEST, SSL_R_BAD_EXTENSION);
432 return 0;
433 }
434 }
435
436 return 1;
437 }
438 #endif
439
440 #ifndef OPENSSL_NO_NEXTPROTONEG
tls_parse_ctos_npn(SSL * s,PACKET * pkt,unsigned int context,X509 * x,size_t chainidx)441 int tls_parse_ctos_npn(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
442 size_t chainidx)
443 {
444 /*
445 * We shouldn't accept this extension on a
446 * renegotiation.
447 */
448 if (SSL_IS_FIRST_HANDSHAKE(s))
449 s->s3->npn_seen = 1;
450
451 return 1;
452 }
453 #endif
454
455 /*
456 * Save the ALPN extension in a ClientHello.|pkt| holds the contents of the ALPN
457 * extension, not including type and length. Returns: 1 on success, 0 on error.
458 */
tls_parse_ctos_alpn(SSL * s,PACKET * pkt,unsigned int context,X509 * x,size_t chainidx)459 int tls_parse_ctos_alpn(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
460 size_t chainidx)
461 {
462 PACKET protocol_list, save_protocol_list, protocol;
463
464 if (!SSL_IS_FIRST_HANDSHAKE(s))
465 return 1;
466
467 if (!PACKET_as_length_prefixed_2(pkt, &protocol_list)
468 || PACKET_remaining(&protocol_list) < 2) {
469 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PARSE_CTOS_ALPN,
470 SSL_R_BAD_EXTENSION);
471 return 0;
472 }
473
474 save_protocol_list = protocol_list;
475 do {
476 /* Protocol names can't be empty. */
477 if (!PACKET_get_length_prefixed_1(&protocol_list, &protocol)
478 || PACKET_remaining(&protocol) == 0) {
479 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PARSE_CTOS_ALPN,
480 SSL_R_BAD_EXTENSION);
481 return 0;
482 }
483 } while (PACKET_remaining(&protocol_list) != 0);
484
485 OPENSSL_free(s->s3->alpn_proposed);
486 s->s3->alpn_proposed = NULL;
487 s->s3->alpn_proposed_len = 0;
488 if (!PACKET_memdup(&save_protocol_list,
489 &s->s3->alpn_proposed, &s->s3->alpn_proposed_len)) {
490 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PARSE_CTOS_ALPN,
491 ERR_R_INTERNAL_ERROR);
492 return 0;
493 }
494
495 return 1;
496 }
497
498 #ifndef OPENSSL_NO_SRTP
tls_parse_ctos_use_srtp(SSL * s,PACKET * pkt,unsigned int context,X509 * x,size_t chainidx)499 int tls_parse_ctos_use_srtp(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
500 size_t chainidx)
501 {
502 STACK_OF(SRTP_PROTECTION_PROFILE) *srvr;
503 unsigned int ct, mki_len, id;
504 int i, srtp_pref;
505 PACKET subpkt;
506
507 /* Ignore this if we have no SRTP profiles */
508 if (SSL_get_srtp_profiles(s) == NULL)
509 return 1;
510
511 /* Pull off the length of the cipher suite list and check it is even */
512 if (!PACKET_get_net_2(pkt, &ct) || (ct & 1) != 0
513 || !PACKET_get_sub_packet(pkt, &subpkt, ct)) {
514 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PARSE_CTOS_USE_SRTP,
515 SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST);
516 return 0;
517 }
518
519 srvr = SSL_get_srtp_profiles(s);
520 s->srtp_profile = NULL;
521 /* Search all profiles for a match initially */
522 srtp_pref = sk_SRTP_PROTECTION_PROFILE_num(srvr);
523
524 while (PACKET_remaining(&subpkt)) {
525 if (!PACKET_get_net_2(&subpkt, &id)) {
526 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PARSE_CTOS_USE_SRTP,
527 SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST);
528 return 0;
529 }
530
531 /*
532 * Only look for match in profiles of higher preference than
533 * current match.
534 * If no profiles have been have been configured then this
535 * does nothing.
536 */
537 for (i = 0; i < srtp_pref; i++) {
538 SRTP_PROTECTION_PROFILE *sprof =
539 sk_SRTP_PROTECTION_PROFILE_value(srvr, i);
540
541 if (sprof->id == id) {
542 s->srtp_profile = sprof;
543 srtp_pref = i;
544 break;
545 }
546 }
547 }
548
549 /* Now extract the MKI value as a sanity check, but discard it for now */
550 if (!PACKET_get_1(pkt, &mki_len)) {
551 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PARSE_CTOS_USE_SRTP,
552 SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST);
553 return 0;
554 }
555
556 if (!PACKET_forward(pkt, mki_len)
557 || PACKET_remaining(pkt)) {
558 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PARSE_CTOS_USE_SRTP,
559 SSL_R_BAD_SRTP_MKI_VALUE);
560 return 0;
561 }
562
563 return 1;
564 }
565 #endif
566
tls_parse_ctos_etm(SSL * s,PACKET * pkt,unsigned int context,X509 * x,size_t chainidx)567 int tls_parse_ctos_etm(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
568 size_t chainidx)
569 {
570 if (!(s->options & SSL_OP_NO_ENCRYPT_THEN_MAC))
571 s->ext.use_etm = 1;
572
573 return 1;
574 }
575
576 /*
577 * Process a psk_kex_modes extension received in the ClientHello. |pkt| contains
578 * the raw PACKET data for the extension. Returns 1 on success or 0 on failure.
579 */
tls_parse_ctos_psk_kex_modes(SSL * s,PACKET * pkt,unsigned int context,X509 * x,size_t chainidx)580 int tls_parse_ctos_psk_kex_modes(SSL *s, PACKET *pkt, unsigned int context,
581 X509 *x, size_t chainidx)
582 {
583 #ifndef OPENSSL_NO_TLS1_3
584 PACKET psk_kex_modes;
585 unsigned int mode;
586
587 if (!PACKET_as_length_prefixed_1(pkt, &psk_kex_modes)
588 || PACKET_remaining(&psk_kex_modes) == 0) {
589 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PARSE_CTOS_PSK_KEX_MODES,
590 SSL_R_BAD_EXTENSION);
591 return 0;
592 }
593
594 while (PACKET_get_1(&psk_kex_modes, &mode)) {
595 if (mode == TLSEXT_KEX_MODE_KE_DHE)
596 s->ext.psk_kex_mode |= TLSEXT_KEX_MODE_FLAG_KE_DHE;
597 else if (mode == TLSEXT_KEX_MODE_KE
598 && (s->options & SSL_OP_ALLOW_NO_DHE_KEX) != 0)
599 s->ext.psk_kex_mode |= TLSEXT_KEX_MODE_FLAG_KE;
600 }
601 #endif
602
603 return 1;
604 }
605
606 /*
607 * Process a key_share extension received in the ClientHello. |pkt| contains
608 * the raw PACKET data for the extension. Returns 1 on success or 0 on failure.
609 */
tls_parse_ctos_key_share(SSL * s,PACKET * pkt,unsigned int context,X509 * x,size_t chainidx)610 int tls_parse_ctos_key_share(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
611 size_t chainidx)
612 {
613 #ifndef OPENSSL_NO_TLS1_3
614 unsigned int group_id;
615 PACKET key_share_list, encoded_pt;
616 const uint16_t *clntgroups, *srvrgroups;
617 size_t clnt_num_groups, srvr_num_groups;
618 int found = 0;
619
620 if (s->hit && (s->ext.psk_kex_mode & TLSEXT_KEX_MODE_FLAG_KE_DHE) == 0)
621 return 1;
622
623 /* Sanity check */
624 if (s->s3->peer_tmp != NULL) {
625 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PARSE_CTOS_KEY_SHARE,
626 ERR_R_INTERNAL_ERROR);
627 return 0;
628 }
629
630 if (!PACKET_as_length_prefixed_2(pkt, &key_share_list)) {
631 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PARSE_CTOS_KEY_SHARE,
632 SSL_R_LENGTH_MISMATCH);
633 return 0;
634 }
635
636 /* Get our list of supported groups */
637 tls1_get_supported_groups(s, &srvrgroups, &srvr_num_groups);
638 /* Get the clients list of supported groups. */
639 tls1_get_peer_groups(s, &clntgroups, &clnt_num_groups);
640 if (clnt_num_groups == 0) {
641 /*
642 * This can only happen if the supported_groups extension was not sent,
643 * because we verify that the length is non-zero when we process that
644 * extension.
645 */
646 SSLfatal(s, SSL_AD_MISSING_EXTENSION, SSL_F_TLS_PARSE_CTOS_KEY_SHARE,
647 SSL_R_MISSING_SUPPORTED_GROUPS_EXTENSION);
648 return 0;
649 }
650
651 if (s->s3->group_id != 0 && PACKET_remaining(&key_share_list) == 0) {
652 /*
653 * If we set a group_id already, then we must have sent an HRR
654 * requesting a new key_share. If we haven't got one then that is an
655 * error
656 */
657 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_F_TLS_PARSE_CTOS_KEY_SHARE,
658 SSL_R_BAD_KEY_SHARE);
659 return 0;
660 }
661
662 while (PACKET_remaining(&key_share_list) > 0) {
663 if (!PACKET_get_net_2(&key_share_list, &group_id)
664 || !PACKET_get_length_prefixed_2(&key_share_list, &encoded_pt)
665 || PACKET_remaining(&encoded_pt) == 0) {
666 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PARSE_CTOS_KEY_SHARE,
667 SSL_R_LENGTH_MISMATCH);
668 return 0;
669 }
670
671 /*
672 * If we already found a suitable key_share we loop through the
673 * rest to verify the structure, but don't process them.
674 */
675 if (found)
676 continue;
677
678 /*
679 * If we sent an HRR then the key_share sent back MUST be for the group
680 * we requested, and must be the only key_share sent.
681 */
682 if (s->s3->group_id != 0
683 && (group_id != s->s3->group_id
684 || PACKET_remaining(&key_share_list) != 0)) {
685 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER,
686 SSL_F_TLS_PARSE_CTOS_KEY_SHARE, SSL_R_BAD_KEY_SHARE);
687 return 0;
688 }
689
690 /* Check if this share is in supported_groups sent from client */
691 if (!check_in_list(s, group_id, clntgroups, clnt_num_groups, 0)) {
692 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER,
693 SSL_F_TLS_PARSE_CTOS_KEY_SHARE, SSL_R_BAD_KEY_SHARE);
694 return 0;
695 }
696
697 /* Check if this share is for a group we can use */
698 if (!check_in_list(s, group_id, srvrgroups, srvr_num_groups, 1)) {
699 /* Share not suitable */
700 continue;
701 }
702
703 if ((s->s3->peer_tmp = ssl_generate_param_group(group_id)) == NULL) {
704 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PARSE_CTOS_KEY_SHARE,
705 SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS);
706 return 0;
707 }
708
709 s->s3->group_id = group_id;
710
711 if (!EVP_PKEY_set1_tls_encodedpoint(s->s3->peer_tmp,
712 PACKET_data(&encoded_pt),
713 PACKET_remaining(&encoded_pt))) {
714 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER,
715 SSL_F_TLS_PARSE_CTOS_KEY_SHARE, SSL_R_BAD_ECPOINT);
716 return 0;
717 }
718
719 found = 1;
720 }
721 #endif
722
723 return 1;
724 }
725
tls_parse_ctos_cookie(SSL * s,PACKET * pkt,unsigned int context,X509 * x,size_t chainidx)726 int tls_parse_ctos_cookie(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
727 size_t chainidx)
728 {
729 #ifndef OPENSSL_NO_TLS1_3
730 unsigned int format, version, key_share, group_id;
731 EVP_MD_CTX *hctx;
732 EVP_PKEY *pkey;
733 PACKET cookie, raw, chhash, appcookie;
734 WPACKET hrrpkt;
735 const unsigned char *data, *mdin, *ciphdata;
736 unsigned char hmac[SHA256_DIGEST_LENGTH];
737 unsigned char hrr[MAX_HRR_SIZE];
738 size_t rawlen, hmaclen, hrrlen, ciphlen;
739 unsigned long tm, now;
740
741 /* Ignore any cookie if we're not set up to verify it */
742 if (s->ctx->verify_stateless_cookie_cb == NULL
743 || (s->s3->flags & TLS1_FLAGS_STATELESS) == 0)
744 return 1;
745
746 if (!PACKET_as_length_prefixed_2(pkt, &cookie)) {
747 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PARSE_CTOS_COOKIE,
748 SSL_R_LENGTH_MISMATCH);
749 return 0;
750 }
751
752 raw = cookie;
753 data = PACKET_data(&raw);
754 rawlen = PACKET_remaining(&raw);
755 if (rawlen < SHA256_DIGEST_LENGTH
756 || !PACKET_forward(&raw, rawlen - SHA256_DIGEST_LENGTH)) {
757 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PARSE_CTOS_COOKIE,
758 SSL_R_LENGTH_MISMATCH);
759 return 0;
760 }
761 mdin = PACKET_data(&raw);
762
763 /* Verify the HMAC of the cookie */
764 hctx = EVP_MD_CTX_create();
765 pkey = EVP_PKEY_new_raw_private_key(EVP_PKEY_HMAC, NULL,
766 s->session_ctx->ext.cookie_hmac_key,
767 sizeof(s->session_ctx->ext
768 .cookie_hmac_key));
769 if (hctx == NULL || pkey == NULL) {
770 EVP_MD_CTX_free(hctx);
771 EVP_PKEY_free(pkey);
772 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PARSE_CTOS_COOKIE,
773 ERR_R_MALLOC_FAILURE);
774 return 0;
775 }
776
777 hmaclen = SHA256_DIGEST_LENGTH;
778 if (EVP_DigestSignInit(hctx, NULL, EVP_sha256(), NULL, pkey) <= 0
779 || EVP_DigestSign(hctx, hmac, &hmaclen, data,
780 rawlen - SHA256_DIGEST_LENGTH) <= 0
781 || hmaclen != SHA256_DIGEST_LENGTH) {
782 EVP_MD_CTX_free(hctx);
783 EVP_PKEY_free(pkey);
784 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PARSE_CTOS_COOKIE,
785 ERR_R_INTERNAL_ERROR);
786 return 0;
787 }
788
789 EVP_MD_CTX_free(hctx);
790 EVP_PKEY_free(pkey);
791
792 if (CRYPTO_memcmp(hmac, mdin, SHA256_DIGEST_LENGTH) != 0) {
793 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_F_TLS_PARSE_CTOS_COOKIE,
794 SSL_R_COOKIE_MISMATCH);
795 return 0;
796 }
797
798 if (!PACKET_get_net_2(&cookie, &format)) {
799 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PARSE_CTOS_COOKIE,
800 SSL_R_LENGTH_MISMATCH);
801 return 0;
802 }
803 /* Check the cookie format is something we recognise. Ignore it if not */
804 if (format != COOKIE_STATE_FORMAT_VERSION)
805 return 1;
806
807 /*
808 * The rest of these checks really shouldn't fail since we have verified the
809 * HMAC above.
810 */
811
812 /* Check the version number is sane */
813 if (!PACKET_get_net_2(&cookie, &version)) {
814 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PARSE_CTOS_COOKIE,
815 SSL_R_LENGTH_MISMATCH);
816 return 0;
817 }
818 if (version != TLS1_3_VERSION) {
819 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_F_TLS_PARSE_CTOS_COOKIE,
820 SSL_R_BAD_PROTOCOL_VERSION_NUMBER);
821 return 0;
822 }
823
824 if (!PACKET_get_net_2(&cookie, &group_id)) {
825 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PARSE_CTOS_COOKIE,
826 SSL_R_LENGTH_MISMATCH);
827 return 0;
828 }
829
830 ciphdata = PACKET_data(&cookie);
831 if (!PACKET_forward(&cookie, 2)) {
832 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PARSE_CTOS_COOKIE,
833 SSL_R_LENGTH_MISMATCH);
834 return 0;
835 }
836 if (group_id != s->s3->group_id
837 || s->s3->tmp.new_cipher
838 != ssl_get_cipher_by_char(s, ciphdata, 0)) {
839 /*
840 * We chose a different cipher or group id this time around to what is
841 * in the cookie. Something must have changed.
842 */
843 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_F_TLS_PARSE_CTOS_COOKIE,
844 SSL_R_BAD_CIPHER);
845 return 0;
846 }
847
848 if (!PACKET_get_1(&cookie, &key_share)
849 || !PACKET_get_net_4(&cookie, &tm)
850 || !PACKET_get_length_prefixed_2(&cookie, &chhash)
851 || !PACKET_get_length_prefixed_1(&cookie, &appcookie)
852 || PACKET_remaining(&cookie) != SHA256_DIGEST_LENGTH) {
853 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PARSE_CTOS_COOKIE,
854 SSL_R_LENGTH_MISMATCH);
855 return 0;
856 }
857
858 /* We tolerate a cookie age of up to 10 minutes (= 60 * 10 seconds) */
859 now = (unsigned long)time(NULL);
860 if (tm > now || (now - tm) > 600) {
861 /* Cookie is stale. Ignore it */
862 return 1;
863 }
864
865 /* Verify the app cookie */
866 if (s->ctx->verify_stateless_cookie_cb(s, PACKET_data(&appcookie),
867 PACKET_remaining(&appcookie)) == 0) {
868 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_F_TLS_PARSE_CTOS_COOKIE,
869 SSL_R_COOKIE_MISMATCH);
870 return 0;
871 }
872
873 /*
874 * Reconstruct the HRR that we would have sent in response to the original
875 * ClientHello so we can add it to the transcript hash.
876 * Note: This won't work with custom HRR extensions
877 */
878 if (!WPACKET_init_static_len(&hrrpkt, hrr, sizeof(hrr), 0)) {
879 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PARSE_CTOS_COOKIE,
880 ERR_R_INTERNAL_ERROR);
881 return 0;
882 }
883 if (!WPACKET_put_bytes_u8(&hrrpkt, SSL3_MT_SERVER_HELLO)
884 || !WPACKET_start_sub_packet_u24(&hrrpkt)
885 || !WPACKET_put_bytes_u16(&hrrpkt, TLS1_2_VERSION)
886 || !WPACKET_memcpy(&hrrpkt, hrrrandom, SSL3_RANDOM_SIZE)
887 || !WPACKET_sub_memcpy_u8(&hrrpkt, s->tmp_session_id,
888 s->tmp_session_id_len)
889 || !s->method->put_cipher_by_char(s->s3->tmp.new_cipher, &hrrpkt,
890 &ciphlen)
891 || !WPACKET_put_bytes_u8(&hrrpkt, 0)
892 || !WPACKET_start_sub_packet_u16(&hrrpkt)) {
893 WPACKET_cleanup(&hrrpkt);
894 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PARSE_CTOS_COOKIE,
895 ERR_R_INTERNAL_ERROR);
896 return 0;
897 }
898 if (!WPACKET_put_bytes_u16(&hrrpkt, TLSEXT_TYPE_supported_versions)
899 || !WPACKET_start_sub_packet_u16(&hrrpkt)
900 || !WPACKET_put_bytes_u16(&hrrpkt, s->version)
901 || !WPACKET_close(&hrrpkt)) {
902 WPACKET_cleanup(&hrrpkt);
903 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PARSE_CTOS_COOKIE,
904 ERR_R_INTERNAL_ERROR);
905 return 0;
906 }
907 if (key_share) {
908 if (!WPACKET_put_bytes_u16(&hrrpkt, TLSEXT_TYPE_key_share)
909 || !WPACKET_start_sub_packet_u16(&hrrpkt)
910 || !WPACKET_put_bytes_u16(&hrrpkt, s->s3->group_id)
911 || !WPACKET_close(&hrrpkt)) {
912 WPACKET_cleanup(&hrrpkt);
913 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PARSE_CTOS_COOKIE,
914 ERR_R_INTERNAL_ERROR);
915 return 0;
916 }
917 }
918 if (!WPACKET_put_bytes_u16(&hrrpkt, TLSEXT_TYPE_cookie)
919 || !WPACKET_start_sub_packet_u16(&hrrpkt)
920 || !WPACKET_sub_memcpy_u16(&hrrpkt, data, rawlen)
921 || !WPACKET_close(&hrrpkt) /* cookie extension */
922 || !WPACKET_close(&hrrpkt) /* extension block */
923 || !WPACKET_close(&hrrpkt) /* message */
924 || !WPACKET_get_total_written(&hrrpkt, &hrrlen)
925 || !WPACKET_finish(&hrrpkt)) {
926 WPACKET_cleanup(&hrrpkt);
927 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PARSE_CTOS_COOKIE,
928 ERR_R_INTERNAL_ERROR);
929 return 0;
930 }
931
932 /* Reconstruct the transcript hash */
933 if (!create_synthetic_message_hash(s, PACKET_data(&chhash),
934 PACKET_remaining(&chhash), hrr,
935 hrrlen)) {
936 /* SSLfatal() already called */
937 return 0;
938 }
939
940 /* Act as if this ClientHello came after a HelloRetryRequest */
941 s->hello_retry_request = 1;
942
943 s->ext.cookieok = 1;
944 #endif
945
946 return 1;
947 }
948
949 #ifndef OPENSSL_NO_EC
tls_parse_ctos_supported_groups(SSL * s,PACKET * pkt,unsigned int context,X509 * x,size_t chainidx)950 int tls_parse_ctos_supported_groups(SSL *s, PACKET *pkt, unsigned int context,
951 X509 *x, size_t chainidx)
952 {
953 PACKET supported_groups_list;
954
955 /* Each group is 2 bytes and we must have at least 1. */
956 if (!PACKET_as_length_prefixed_2(pkt, &supported_groups_list)
957 || PACKET_remaining(&supported_groups_list) == 0
958 || (PACKET_remaining(&supported_groups_list) % 2) != 0) {
959 SSLfatal(s, SSL_AD_DECODE_ERROR,
960 SSL_F_TLS_PARSE_CTOS_SUPPORTED_GROUPS, SSL_R_BAD_EXTENSION);
961 return 0;
962 }
963
964 if (!s->hit || SSL_IS_TLS13(s)) {
965 OPENSSL_free(s->ext.peer_supportedgroups);
966 s->ext.peer_supportedgroups = NULL;
967 s->ext.peer_supportedgroups_len = 0;
968 if (!tls1_save_u16(&supported_groups_list,
969 &s->ext.peer_supportedgroups,
970 &s->ext.peer_supportedgroups_len)) {
971 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
972 SSL_F_TLS_PARSE_CTOS_SUPPORTED_GROUPS,
973 ERR_R_INTERNAL_ERROR);
974 return 0;
975 }
976 }
977
978 return 1;
979 }
980 #endif
981
tls_parse_ctos_ems(SSL * s,PACKET * pkt,unsigned int context,X509 * x,size_t chainidx)982 int tls_parse_ctos_ems(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
983 size_t chainidx)
984 {
985 /* The extension must always be empty */
986 if (PACKET_remaining(pkt) != 0) {
987 SSLfatal(s, SSL_AD_DECODE_ERROR,
988 SSL_F_TLS_PARSE_CTOS_EMS, SSL_R_BAD_EXTENSION);
989 return 0;
990 }
991
992 s->s3->flags |= TLS1_FLAGS_RECEIVED_EXTMS;
993
994 return 1;
995 }
996
997
tls_parse_ctos_early_data(SSL * s,PACKET * pkt,unsigned int context,X509 * x,size_t chainidx)998 int tls_parse_ctos_early_data(SSL *s, PACKET *pkt, unsigned int context,
999 X509 *x, size_t chainidx)
1000 {
1001 if (PACKET_remaining(pkt) != 0) {
1002 SSLfatal(s, SSL_AD_DECODE_ERROR,
1003 SSL_F_TLS_PARSE_CTOS_EARLY_DATA, SSL_R_BAD_EXTENSION);
1004 return 0;
1005 }
1006
1007 if (s->hello_retry_request != SSL_HRR_NONE) {
1008 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER,
1009 SSL_F_TLS_PARSE_CTOS_EARLY_DATA, SSL_R_BAD_EXTENSION);
1010 return 0;
1011 }
1012
1013 return 1;
1014 }
1015
tls_get_stateful_ticket(SSL * s,PACKET * tick,SSL_SESSION ** sess)1016 static SSL_TICKET_STATUS tls_get_stateful_ticket(SSL *s, PACKET *tick,
1017 SSL_SESSION **sess)
1018 {
1019 SSL_SESSION *tmpsess = NULL;
1020
1021 s->ext.ticket_expected = 1;
1022
1023 switch (PACKET_remaining(tick)) {
1024 case 0:
1025 return SSL_TICKET_EMPTY;
1026
1027 case SSL_MAX_SSL_SESSION_ID_LENGTH:
1028 break;
1029
1030 default:
1031 return SSL_TICKET_NO_DECRYPT;
1032 }
1033
1034 tmpsess = lookup_sess_in_cache(s, PACKET_data(tick),
1035 SSL_MAX_SSL_SESSION_ID_LENGTH);
1036
1037 if (tmpsess == NULL)
1038 return SSL_TICKET_NO_DECRYPT;
1039
1040 *sess = tmpsess;
1041 return SSL_TICKET_SUCCESS;
1042 }
1043
tls_parse_ctos_psk(SSL * s,PACKET * pkt,unsigned int context,X509 * x,size_t chainidx)1044 int tls_parse_ctos_psk(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
1045 size_t chainidx)
1046 {
1047 PACKET identities, binders, binder;
1048 size_t binderoffset, hashsize;
1049 SSL_SESSION *sess = NULL;
1050 unsigned int id, i, ext = 0;
1051 const EVP_MD *md = NULL;
1052
1053 /*
1054 * If we have no PSK kex mode that we recognise then we can't resume so
1055 * ignore this extension
1056 */
1057 if ((s->ext.psk_kex_mode
1058 & (TLSEXT_KEX_MODE_FLAG_KE | TLSEXT_KEX_MODE_FLAG_KE_DHE)) == 0)
1059 return 1;
1060
1061 if (!PACKET_get_length_prefixed_2(pkt, &identities)) {
1062 SSLfatal(s, SSL_AD_DECODE_ERROR,
1063 SSL_F_TLS_PARSE_CTOS_PSK, SSL_R_BAD_EXTENSION);
1064 return 0;
1065 }
1066
1067 s->ext.ticket_expected = 0;
1068 for (id = 0; PACKET_remaining(&identities) != 0; id++) {
1069 PACKET identity;
1070 unsigned long ticket_agel;
1071 size_t idlen;
1072
1073 if (!PACKET_get_length_prefixed_2(&identities, &identity)
1074 || !PACKET_get_net_4(&identities, &ticket_agel)) {
1075 SSLfatal(s, SSL_AD_DECODE_ERROR,
1076 SSL_F_TLS_PARSE_CTOS_PSK, SSL_R_BAD_EXTENSION);
1077 return 0;
1078 }
1079
1080 idlen = PACKET_remaining(&identity);
1081 if (s->psk_find_session_cb != NULL
1082 && !s->psk_find_session_cb(s, PACKET_data(&identity), idlen,
1083 &sess)) {
1084 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
1085 SSL_F_TLS_PARSE_CTOS_PSK, SSL_R_BAD_EXTENSION);
1086 return 0;
1087 }
1088
1089 #ifndef OPENSSL_NO_PSK
1090 if(sess == NULL
1091 && s->psk_server_callback != NULL
1092 && idlen <= PSK_MAX_IDENTITY_LEN) {
1093 char *pskid = NULL;
1094 unsigned char pskdata[PSK_MAX_PSK_LEN];
1095 unsigned int pskdatalen;
1096
1097 if (!PACKET_strndup(&identity, &pskid)) {
1098 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PARSE_CTOS_PSK,
1099 ERR_R_INTERNAL_ERROR);
1100 return 0;
1101 }
1102 pskdatalen = s->psk_server_callback(s, pskid, pskdata,
1103 sizeof(pskdata));
1104 OPENSSL_free(pskid);
1105 if (pskdatalen > PSK_MAX_PSK_LEN) {
1106 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PARSE_CTOS_PSK,
1107 ERR_R_INTERNAL_ERROR);
1108 return 0;
1109 } else if (pskdatalen > 0) {
1110 const SSL_CIPHER *cipher;
1111 const unsigned char tls13_aes128gcmsha256_id[] = { 0x13, 0x01 };
1112
1113 /*
1114 * We found a PSK using an old style callback. We don't know
1115 * the digest so we default to SHA256 as per the TLSv1.3 spec
1116 */
1117 cipher = SSL_CIPHER_find(s, tls13_aes128gcmsha256_id);
1118 if (cipher == NULL) {
1119 OPENSSL_cleanse(pskdata, pskdatalen);
1120 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PARSE_CTOS_PSK,
1121 ERR_R_INTERNAL_ERROR);
1122 return 0;
1123 }
1124
1125 sess = SSL_SESSION_new();
1126 if (sess == NULL
1127 || !SSL_SESSION_set1_master_key(sess, pskdata,
1128 pskdatalen)
1129 || !SSL_SESSION_set_cipher(sess, cipher)
1130 || !SSL_SESSION_set_protocol_version(sess,
1131 TLS1_3_VERSION)) {
1132 OPENSSL_cleanse(pskdata, pskdatalen);
1133 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PARSE_CTOS_PSK,
1134 ERR_R_INTERNAL_ERROR);
1135 goto err;
1136 }
1137 OPENSSL_cleanse(pskdata, pskdatalen);
1138 }
1139 }
1140 #endif /* OPENSSL_NO_PSK */
1141
1142 if (sess != NULL) {
1143 /* We found a PSK */
1144 SSL_SESSION *sesstmp = ssl_session_dup(sess, 0);
1145
1146 if (sesstmp == NULL) {
1147 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
1148 SSL_F_TLS_PARSE_CTOS_PSK, ERR_R_INTERNAL_ERROR);
1149 return 0;
1150 }
1151 SSL_SESSION_free(sess);
1152 sess = sesstmp;
1153
1154 /*
1155 * We've just been told to use this session for this context so
1156 * make sure the sid_ctx matches up.
1157 */
1158 memcpy(sess->sid_ctx, s->sid_ctx, s->sid_ctx_length);
1159 sess->sid_ctx_length = s->sid_ctx_length;
1160 ext = 1;
1161 if (id == 0)
1162 s->ext.early_data_ok = 1;
1163 s->ext.ticket_expected = 1;
1164 } else {
1165 uint32_t ticket_age = 0, now, agesec, agems;
1166 int ret;
1167
1168 /*
1169 * If we are using anti-replay protection then we behave as if
1170 * SSL_OP_NO_TICKET is set - we are caching tickets anyway so there
1171 * is no point in using full stateless tickets.
1172 */
1173 if ((s->options & SSL_OP_NO_TICKET) != 0
1174 || (s->max_early_data > 0
1175 && (s->options & SSL_OP_NO_ANTI_REPLAY) == 0))
1176 ret = tls_get_stateful_ticket(s, &identity, &sess);
1177 else
1178 ret = tls_decrypt_ticket(s, PACKET_data(&identity),
1179 PACKET_remaining(&identity), NULL, 0,
1180 &sess);
1181
1182 if (ret == SSL_TICKET_EMPTY) {
1183 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PARSE_CTOS_PSK,
1184 SSL_R_BAD_EXTENSION);
1185 return 0;
1186 }
1187
1188 if (ret == SSL_TICKET_FATAL_ERR_MALLOC
1189 || ret == SSL_TICKET_FATAL_ERR_OTHER) {
1190 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
1191 SSL_F_TLS_PARSE_CTOS_PSK, ERR_R_INTERNAL_ERROR);
1192 return 0;
1193 }
1194 if (ret == SSL_TICKET_NONE || ret == SSL_TICKET_NO_DECRYPT)
1195 continue;
1196
1197 /* Check for replay */
1198 if (s->max_early_data > 0
1199 && (s->options & SSL_OP_NO_ANTI_REPLAY) == 0
1200 && !SSL_CTX_remove_session(s->session_ctx, sess)) {
1201 SSL_SESSION_free(sess);
1202 sess = NULL;
1203 continue;
1204 }
1205
1206 ticket_age = (uint32_t)ticket_agel;
1207 now = (uint32_t)time(NULL);
1208 agesec = now - (uint32_t)sess->time;
1209 agems = agesec * (uint32_t)1000;
1210 ticket_age -= sess->ext.tick_age_add;
1211
1212 /*
1213 * For simplicity we do our age calculations in seconds. If the
1214 * client does it in ms then it could appear that their ticket age
1215 * is longer than ours (our ticket age calculation should always be
1216 * slightly longer than the client's due to the network latency).
1217 * Therefore we add 1000ms to our age calculation to adjust for
1218 * rounding errors.
1219 */
1220 if (id == 0
1221 && sess->timeout >= (long)agesec
1222 && agems / (uint32_t)1000 == agesec
1223 && ticket_age <= agems + 1000
1224 && ticket_age + TICKET_AGE_ALLOWANCE >= agems + 1000) {
1225 /*
1226 * Ticket age is within tolerance and not expired. We allow it
1227 * for early data
1228 */
1229 s->ext.early_data_ok = 1;
1230 }
1231 }
1232
1233 md = ssl_md(sess->cipher->algorithm2);
1234 if (md != ssl_md(s->s3->tmp.new_cipher->algorithm2)) {
1235 /* The ciphersuite is not compatible with this session. */
1236 SSL_SESSION_free(sess);
1237 sess = NULL;
1238 s->ext.early_data_ok = 0;
1239 s->ext.ticket_expected = 0;
1240 continue;
1241 }
1242 break;
1243 }
1244
1245 if (sess == NULL)
1246 return 1;
1247
1248 binderoffset = PACKET_data(pkt) - (const unsigned char *)s->init_buf->data;
1249 hashsize = EVP_MD_size(md);
1250
1251 if (!PACKET_get_length_prefixed_2(pkt, &binders)) {
1252 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PARSE_CTOS_PSK,
1253 SSL_R_BAD_EXTENSION);
1254 goto err;
1255 }
1256
1257 for (i = 0; i <= id; i++) {
1258 if (!PACKET_get_length_prefixed_1(&binders, &binder)) {
1259 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PARSE_CTOS_PSK,
1260 SSL_R_BAD_EXTENSION);
1261 goto err;
1262 }
1263 }
1264
1265 if (PACKET_remaining(&binder) != hashsize) {
1266 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PARSE_CTOS_PSK,
1267 SSL_R_BAD_EXTENSION);
1268 goto err;
1269 }
1270 if (tls_psk_do_binder(s, md, (const unsigned char *)s->init_buf->data,
1271 binderoffset, PACKET_data(&binder), NULL, sess, 0,
1272 ext) != 1) {
1273 /* SSLfatal() already called */
1274 goto err;
1275 }
1276
1277 s->ext.tick_identity = id;
1278
1279 SSL_SESSION_free(s->session);
1280 s->session = sess;
1281 return 1;
1282 err:
1283 SSL_SESSION_free(sess);
1284 return 0;
1285 }
1286
tls_parse_ctos_post_handshake_auth(SSL * s,PACKET * pkt,unsigned int context,X509 * x,size_t chainidx)1287 int tls_parse_ctos_post_handshake_auth(SSL *s, PACKET *pkt, unsigned int context,
1288 X509 *x, size_t chainidx)
1289 {
1290 if (PACKET_remaining(pkt) != 0) {
1291 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PARSE_CTOS_POST_HANDSHAKE_AUTH,
1292 SSL_R_POST_HANDSHAKE_AUTH_ENCODING_ERR);
1293 return 0;
1294 }
1295
1296 s->post_handshake_auth = SSL_PHA_EXT_RECEIVED;
1297
1298 return 1;
1299 }
1300
1301 /*
1302 * Add the server's renegotiation binding
1303 */
tls_construct_stoc_renegotiate(SSL * s,WPACKET * pkt,unsigned int context,X509 * x,size_t chainidx)1304 EXT_RETURN tls_construct_stoc_renegotiate(SSL *s, WPACKET *pkt,
1305 unsigned int context, X509 *x,
1306 size_t chainidx)
1307 {
1308 if (!s->s3->send_connection_binding)
1309 return EXT_RETURN_NOT_SENT;
1310
1311 /* Still add this even if SSL_OP_NO_RENEGOTIATION is set */
1312 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_renegotiate)
1313 || !WPACKET_start_sub_packet_u16(pkt)
1314 || !WPACKET_start_sub_packet_u8(pkt)
1315 || !WPACKET_memcpy(pkt, s->s3->previous_client_finished,
1316 s->s3->previous_client_finished_len)
1317 || !WPACKET_memcpy(pkt, s->s3->previous_server_finished,
1318 s->s3->previous_server_finished_len)
1319 || !WPACKET_close(pkt)
1320 || !WPACKET_close(pkt)) {
1321 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_STOC_RENEGOTIATE,
1322 ERR_R_INTERNAL_ERROR);
1323 return EXT_RETURN_FAIL;
1324 }
1325
1326 return EXT_RETURN_SENT;
1327 }
1328
tls_construct_stoc_server_name(SSL * s,WPACKET * pkt,unsigned int context,X509 * x,size_t chainidx)1329 EXT_RETURN tls_construct_stoc_server_name(SSL *s, WPACKET *pkt,
1330 unsigned int context, X509 *x,
1331 size_t chainidx)
1332 {
1333 if (s->hit || s->servername_done != 1
1334 || s->ext.hostname == NULL)
1335 return EXT_RETURN_NOT_SENT;
1336
1337 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_server_name)
1338 || !WPACKET_put_bytes_u16(pkt, 0)) {
1339 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_STOC_SERVER_NAME,
1340 ERR_R_INTERNAL_ERROR);
1341 return EXT_RETURN_FAIL;
1342 }
1343
1344 return EXT_RETURN_SENT;
1345 }
1346
1347 /* Add/include the server's max fragment len extension into ServerHello */
tls_construct_stoc_maxfragmentlen(SSL * s,WPACKET * pkt,unsigned int context,X509 * x,size_t chainidx)1348 EXT_RETURN tls_construct_stoc_maxfragmentlen(SSL *s, WPACKET *pkt,
1349 unsigned int context, X509 *x,
1350 size_t chainidx)
1351 {
1352 if (!USE_MAX_FRAGMENT_LENGTH_EXT(s->session))
1353 return EXT_RETURN_NOT_SENT;
1354
1355 /*-
1356 * 4 bytes for this extension type and extension length
1357 * 1 byte for the Max Fragment Length code value.
1358 */
1359 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_max_fragment_length)
1360 || !WPACKET_start_sub_packet_u16(pkt)
1361 || !WPACKET_put_bytes_u8(pkt, s->session->ext.max_fragment_len_mode)
1362 || !WPACKET_close(pkt)) {
1363 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
1364 SSL_F_TLS_CONSTRUCT_STOC_MAXFRAGMENTLEN, ERR_R_INTERNAL_ERROR);
1365 return EXT_RETURN_FAIL;
1366 }
1367
1368 return EXT_RETURN_SENT;
1369 }
1370
1371 #ifndef OPENSSL_NO_EC
tls_construct_stoc_ec_pt_formats(SSL * s,WPACKET * pkt,unsigned int context,X509 * x,size_t chainidx)1372 EXT_RETURN tls_construct_stoc_ec_pt_formats(SSL *s, WPACKET *pkt,
1373 unsigned int context, X509 *x,
1374 size_t chainidx)
1375 {
1376 unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
1377 unsigned long alg_a = s->s3->tmp.new_cipher->algorithm_auth;
1378 int using_ecc = ((alg_k & SSL_kECDHE) || (alg_a & SSL_aECDSA))
1379 && (s->ext.peer_ecpointformats != NULL);
1380 const unsigned char *plist;
1381 size_t plistlen;
1382
1383 if (!using_ecc)
1384 return EXT_RETURN_NOT_SENT;
1385
1386 tls1_get_formatlist(s, &plist, &plistlen);
1387 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_ec_point_formats)
1388 || !WPACKET_start_sub_packet_u16(pkt)
1389 || !WPACKET_sub_memcpy_u8(pkt, plist, plistlen)
1390 || !WPACKET_close(pkt)) {
1391 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
1392 SSL_F_TLS_CONSTRUCT_STOC_EC_PT_FORMATS, ERR_R_INTERNAL_ERROR);
1393 return EXT_RETURN_FAIL;
1394 }
1395
1396 return EXT_RETURN_SENT;
1397 }
1398 #endif
1399
1400 #ifndef OPENSSL_NO_EC
tls_construct_stoc_supported_groups(SSL * s,WPACKET * pkt,unsigned int context,X509 * x,size_t chainidx)1401 EXT_RETURN tls_construct_stoc_supported_groups(SSL *s, WPACKET *pkt,
1402 unsigned int context, X509 *x,
1403 size_t chainidx)
1404 {
1405 const uint16_t *groups;
1406 size_t numgroups, i, first = 1;
1407
1408 /* s->s3->group_id is non zero if we accepted a key_share */
1409 if (s->s3->group_id == 0)
1410 return EXT_RETURN_NOT_SENT;
1411
1412 /* Get our list of supported groups */
1413 tls1_get_supported_groups(s, &groups, &numgroups);
1414 if (numgroups == 0) {
1415 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
1416 SSL_F_TLS_CONSTRUCT_STOC_SUPPORTED_GROUPS, ERR_R_INTERNAL_ERROR);
1417 return EXT_RETURN_FAIL;
1418 }
1419
1420 /* Copy group ID if supported */
1421 for (i = 0; i < numgroups; i++) {
1422 uint16_t group = groups[i];
1423
1424 if (tls_curve_allowed(s, group, SSL_SECOP_CURVE_SUPPORTED)) {
1425 if (first) {
1426 /*
1427 * Check if the client is already using our preferred group. If
1428 * so we don't need to add this extension
1429 */
1430 if (s->s3->group_id == group)
1431 return EXT_RETURN_NOT_SENT;
1432
1433 /* Add extension header */
1434 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_supported_groups)
1435 /* Sub-packet for supported_groups extension */
1436 || !WPACKET_start_sub_packet_u16(pkt)
1437 || !WPACKET_start_sub_packet_u16(pkt)) {
1438 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
1439 SSL_F_TLS_CONSTRUCT_STOC_SUPPORTED_GROUPS,
1440 ERR_R_INTERNAL_ERROR);
1441 return EXT_RETURN_FAIL;
1442 }
1443
1444 first = 0;
1445 }
1446 if (!WPACKET_put_bytes_u16(pkt, group)) {
1447 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
1448 SSL_F_TLS_CONSTRUCT_STOC_SUPPORTED_GROUPS,
1449 ERR_R_INTERNAL_ERROR);
1450 return EXT_RETURN_FAIL;
1451 }
1452 }
1453 }
1454
1455 if (!WPACKET_close(pkt) || !WPACKET_close(pkt)) {
1456 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
1457 SSL_F_TLS_CONSTRUCT_STOC_SUPPORTED_GROUPS,
1458 ERR_R_INTERNAL_ERROR);
1459 return EXT_RETURN_FAIL;
1460 }
1461
1462 return EXT_RETURN_SENT;
1463 }
1464 #endif
1465
tls_construct_stoc_session_ticket(SSL * s,WPACKET * pkt,unsigned int context,X509 * x,size_t chainidx)1466 EXT_RETURN tls_construct_stoc_session_ticket(SSL *s, WPACKET *pkt,
1467 unsigned int context, X509 *x,
1468 size_t chainidx)
1469 {
1470 if (!s->ext.ticket_expected || !tls_use_ticket(s)) {
1471 s->ext.ticket_expected = 0;
1472 return EXT_RETURN_NOT_SENT;
1473 }
1474
1475 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_session_ticket)
1476 || !WPACKET_put_bytes_u16(pkt, 0)) {
1477 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
1478 SSL_F_TLS_CONSTRUCT_STOC_SESSION_TICKET, ERR_R_INTERNAL_ERROR);
1479 return EXT_RETURN_FAIL;
1480 }
1481
1482 return EXT_RETURN_SENT;
1483 }
1484
1485 #ifndef OPENSSL_NO_OCSP
tls_construct_stoc_status_request(SSL * s,WPACKET * pkt,unsigned int context,X509 * x,size_t chainidx)1486 EXT_RETURN tls_construct_stoc_status_request(SSL *s, WPACKET *pkt,
1487 unsigned int context, X509 *x,
1488 size_t chainidx)
1489 {
1490 /* We don't currently support this extension inside a CertificateRequest */
1491 if (context == SSL_EXT_TLS1_3_CERTIFICATE_REQUEST)
1492 return EXT_RETURN_NOT_SENT;
1493
1494 if (!s->ext.status_expected)
1495 return EXT_RETURN_NOT_SENT;
1496
1497 if (SSL_IS_TLS13(s) && chainidx != 0)
1498 return EXT_RETURN_NOT_SENT;
1499
1500 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_status_request)
1501 || !WPACKET_start_sub_packet_u16(pkt)) {
1502 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
1503 SSL_F_TLS_CONSTRUCT_STOC_STATUS_REQUEST, ERR_R_INTERNAL_ERROR);
1504 return EXT_RETURN_FAIL;
1505 }
1506
1507 /*
1508 * In TLSv1.3 we include the certificate status itself. In <= TLSv1.2 we
1509 * send back an empty extension, with the certificate status appearing as a
1510 * separate message
1511 */
1512 if (SSL_IS_TLS13(s) && !tls_construct_cert_status_body(s, pkt)) {
1513 /* SSLfatal() already called */
1514 return EXT_RETURN_FAIL;
1515 }
1516 if (!WPACKET_close(pkt)) {
1517 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
1518 SSL_F_TLS_CONSTRUCT_STOC_STATUS_REQUEST, ERR_R_INTERNAL_ERROR);
1519 return EXT_RETURN_FAIL;
1520 }
1521
1522 return EXT_RETURN_SENT;
1523 }
1524 #endif
1525
1526 #ifndef OPENSSL_NO_NEXTPROTONEG
tls_construct_stoc_next_proto_neg(SSL * s,WPACKET * pkt,unsigned int context,X509 * x,size_t chainidx)1527 EXT_RETURN tls_construct_stoc_next_proto_neg(SSL *s, WPACKET *pkt,
1528 unsigned int context, X509 *x,
1529 size_t chainidx)
1530 {
1531 const unsigned char *npa;
1532 unsigned int npalen;
1533 int ret;
1534 int npn_seen = s->s3->npn_seen;
1535
1536 s->s3->npn_seen = 0;
1537 if (!npn_seen || s->ctx->ext.npn_advertised_cb == NULL)
1538 return EXT_RETURN_NOT_SENT;
1539
1540 ret = s->ctx->ext.npn_advertised_cb(s, &npa, &npalen,
1541 s->ctx->ext.npn_advertised_cb_arg);
1542 if (ret == SSL_TLSEXT_ERR_OK) {
1543 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_next_proto_neg)
1544 || !WPACKET_sub_memcpy_u16(pkt, npa, npalen)) {
1545 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
1546 SSL_F_TLS_CONSTRUCT_STOC_NEXT_PROTO_NEG,
1547 ERR_R_INTERNAL_ERROR);
1548 return EXT_RETURN_FAIL;
1549 }
1550 s->s3->npn_seen = 1;
1551 }
1552
1553 return EXT_RETURN_SENT;
1554 }
1555 #endif
1556
tls_construct_stoc_alpn(SSL * s,WPACKET * pkt,unsigned int context,X509 * x,size_t chainidx)1557 EXT_RETURN tls_construct_stoc_alpn(SSL *s, WPACKET *pkt, unsigned int context,
1558 X509 *x, size_t chainidx)
1559 {
1560 if (s->s3->alpn_selected == NULL)
1561 return EXT_RETURN_NOT_SENT;
1562
1563 if (!WPACKET_put_bytes_u16(pkt,
1564 TLSEXT_TYPE_application_layer_protocol_negotiation)
1565 || !WPACKET_start_sub_packet_u16(pkt)
1566 || !WPACKET_start_sub_packet_u16(pkt)
1567 || !WPACKET_sub_memcpy_u8(pkt, s->s3->alpn_selected,
1568 s->s3->alpn_selected_len)
1569 || !WPACKET_close(pkt)
1570 || !WPACKET_close(pkt)) {
1571 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
1572 SSL_F_TLS_CONSTRUCT_STOC_ALPN, ERR_R_INTERNAL_ERROR);
1573 return EXT_RETURN_FAIL;
1574 }
1575
1576 return EXT_RETURN_SENT;
1577 }
1578
1579 #ifndef OPENSSL_NO_SRTP
tls_construct_stoc_use_srtp(SSL * s,WPACKET * pkt,unsigned int context,X509 * x,size_t chainidx)1580 EXT_RETURN tls_construct_stoc_use_srtp(SSL *s, WPACKET *pkt,
1581 unsigned int context, X509 *x,
1582 size_t chainidx)
1583 {
1584 if (s->srtp_profile == NULL)
1585 return EXT_RETURN_NOT_SENT;
1586
1587 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_use_srtp)
1588 || !WPACKET_start_sub_packet_u16(pkt)
1589 || !WPACKET_put_bytes_u16(pkt, 2)
1590 || !WPACKET_put_bytes_u16(pkt, s->srtp_profile->id)
1591 || !WPACKET_put_bytes_u8(pkt, 0)
1592 || !WPACKET_close(pkt)) {
1593 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_STOC_USE_SRTP,
1594 ERR_R_INTERNAL_ERROR);
1595 return EXT_RETURN_FAIL;
1596 }
1597
1598 return EXT_RETURN_SENT;
1599 }
1600 #endif
1601
tls_construct_stoc_etm(SSL * s,WPACKET * pkt,unsigned int context,X509 * x,size_t chainidx)1602 EXT_RETURN tls_construct_stoc_etm(SSL *s, WPACKET *pkt, unsigned int context,
1603 X509 *x, size_t chainidx)
1604 {
1605 if (!s->ext.use_etm)
1606 return EXT_RETURN_NOT_SENT;
1607
1608 /*
1609 * Don't use encrypt_then_mac if AEAD or RC4 might want to disable
1610 * for other cases too.
1611 */
1612 if (s->s3->tmp.new_cipher->algorithm_mac == SSL_AEAD
1613 || s->s3->tmp.new_cipher->algorithm_enc == SSL_RC4
1614 || s->s3->tmp.new_cipher->algorithm_enc == SSL_eGOST2814789CNT
1615 || s->s3->tmp.new_cipher->algorithm_enc == SSL_eGOST2814789CNT12) {
1616 s->ext.use_etm = 0;
1617 return EXT_RETURN_NOT_SENT;
1618 }
1619
1620 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_encrypt_then_mac)
1621 || !WPACKET_put_bytes_u16(pkt, 0)) {
1622 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_STOC_ETM,
1623 ERR_R_INTERNAL_ERROR);
1624 return EXT_RETURN_FAIL;
1625 }
1626
1627 return EXT_RETURN_SENT;
1628 }
1629
tls_construct_stoc_ems(SSL * s,WPACKET * pkt,unsigned int context,X509 * x,size_t chainidx)1630 EXT_RETURN tls_construct_stoc_ems(SSL *s, WPACKET *pkt, unsigned int context,
1631 X509 *x, size_t chainidx)
1632 {
1633 if ((s->s3->flags & TLS1_FLAGS_RECEIVED_EXTMS) == 0)
1634 return EXT_RETURN_NOT_SENT;
1635
1636 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_extended_master_secret)
1637 || !WPACKET_put_bytes_u16(pkt, 0)) {
1638 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_STOC_EMS,
1639 ERR_R_INTERNAL_ERROR);
1640 return EXT_RETURN_FAIL;
1641 }
1642
1643 return EXT_RETURN_SENT;
1644 }
1645
tls_construct_stoc_supported_versions(SSL * s,WPACKET * pkt,unsigned int context,X509 * x,size_t chainidx)1646 EXT_RETURN tls_construct_stoc_supported_versions(SSL *s, WPACKET *pkt,
1647 unsigned int context, X509 *x,
1648 size_t chainidx)
1649 {
1650 if (!ossl_assert(SSL_IS_TLS13(s))) {
1651 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
1652 SSL_F_TLS_CONSTRUCT_STOC_SUPPORTED_VERSIONS,
1653 ERR_R_INTERNAL_ERROR);
1654 return EXT_RETURN_FAIL;
1655 }
1656
1657 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_supported_versions)
1658 || !WPACKET_start_sub_packet_u16(pkt)
1659 || !WPACKET_put_bytes_u16(pkt, s->version)
1660 || !WPACKET_close(pkt)) {
1661 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
1662 SSL_F_TLS_CONSTRUCT_STOC_SUPPORTED_VERSIONS,
1663 ERR_R_INTERNAL_ERROR);
1664 return EXT_RETURN_FAIL;
1665 }
1666
1667 return EXT_RETURN_SENT;
1668 }
1669
tls_construct_stoc_key_share(SSL * s,WPACKET * pkt,unsigned int context,X509 * x,size_t chainidx)1670 EXT_RETURN tls_construct_stoc_key_share(SSL *s, WPACKET *pkt,
1671 unsigned int context, X509 *x,
1672 size_t chainidx)
1673 {
1674 #ifndef OPENSSL_NO_TLS1_3
1675 unsigned char *encodedPoint;
1676 size_t encoded_pt_len = 0;
1677 EVP_PKEY *ckey = s->s3->peer_tmp, *skey = NULL;
1678
1679 if (s->hello_retry_request == SSL_HRR_PENDING) {
1680 if (ckey != NULL) {
1681 /* Original key_share was acceptable so don't ask for another one */
1682 return EXT_RETURN_NOT_SENT;
1683 }
1684 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_key_share)
1685 || !WPACKET_start_sub_packet_u16(pkt)
1686 || !WPACKET_put_bytes_u16(pkt, s->s3->group_id)
1687 || !WPACKET_close(pkt)) {
1688 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
1689 SSL_F_TLS_CONSTRUCT_STOC_KEY_SHARE,
1690 ERR_R_INTERNAL_ERROR);
1691 return EXT_RETURN_FAIL;
1692 }
1693
1694 return EXT_RETURN_SENT;
1695 }
1696
1697 if (ckey == NULL) {
1698 /* No key_share received from client - must be resuming */
1699 if (!s->hit || !tls13_generate_handshake_secret(s, NULL, 0)) {
1700 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
1701 SSL_F_TLS_CONSTRUCT_STOC_KEY_SHARE, ERR_R_INTERNAL_ERROR);
1702 return EXT_RETURN_FAIL;
1703 }
1704 return EXT_RETURN_NOT_SENT;
1705 }
1706
1707 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_key_share)
1708 || !WPACKET_start_sub_packet_u16(pkt)
1709 || !WPACKET_put_bytes_u16(pkt, s->s3->group_id)) {
1710 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
1711 SSL_F_TLS_CONSTRUCT_STOC_KEY_SHARE, ERR_R_INTERNAL_ERROR);
1712 return EXT_RETURN_FAIL;
1713 }
1714
1715 skey = ssl_generate_pkey(ckey);
1716 if (skey == NULL) {
1717 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_STOC_KEY_SHARE,
1718 ERR_R_MALLOC_FAILURE);
1719 return EXT_RETURN_FAIL;
1720 }
1721
1722 /* Generate encoding of server key */
1723 encoded_pt_len = EVP_PKEY_get1_tls_encodedpoint(skey, &encodedPoint);
1724 if (encoded_pt_len == 0) {
1725 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_STOC_KEY_SHARE,
1726 ERR_R_EC_LIB);
1727 EVP_PKEY_free(skey);
1728 return EXT_RETURN_FAIL;
1729 }
1730
1731 if (!WPACKET_sub_memcpy_u16(pkt, encodedPoint, encoded_pt_len)
1732 || !WPACKET_close(pkt)) {
1733 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_STOC_KEY_SHARE,
1734 ERR_R_INTERNAL_ERROR);
1735 EVP_PKEY_free(skey);
1736 OPENSSL_free(encodedPoint);
1737 return EXT_RETURN_FAIL;
1738 }
1739 OPENSSL_free(encodedPoint);
1740
1741 /* This causes the crypto state to be updated based on the derived keys */
1742 s->s3->tmp.pkey = skey;
1743 if (ssl_derive(s, skey, ckey, 1) == 0) {
1744 /* SSLfatal() already called */
1745 return EXT_RETURN_FAIL;
1746 }
1747 return EXT_RETURN_SENT;
1748 #else
1749 return EXT_RETURN_FAIL;
1750 #endif
1751 }
1752
tls_construct_stoc_cookie(SSL * s,WPACKET * pkt,unsigned int context,X509 * x,size_t chainidx)1753 EXT_RETURN tls_construct_stoc_cookie(SSL *s, WPACKET *pkt, unsigned int context,
1754 X509 *x, size_t chainidx)
1755 {
1756 #ifndef OPENSSL_NO_TLS1_3
1757 unsigned char *hashval1, *hashval2, *appcookie1, *appcookie2, *cookie;
1758 unsigned char *hmac, *hmac2;
1759 size_t startlen, ciphlen, totcookielen, hashlen, hmaclen, appcookielen;
1760 EVP_MD_CTX *hctx;
1761 EVP_PKEY *pkey;
1762 int ret = EXT_RETURN_FAIL;
1763
1764 if ((s->s3->flags & TLS1_FLAGS_STATELESS) == 0)
1765 return EXT_RETURN_NOT_SENT;
1766
1767 if (s->ctx->gen_stateless_cookie_cb == NULL) {
1768 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_STOC_COOKIE,
1769 SSL_R_NO_COOKIE_CALLBACK_SET);
1770 return EXT_RETURN_FAIL;
1771 }
1772
1773 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_cookie)
1774 || !WPACKET_start_sub_packet_u16(pkt)
1775 || !WPACKET_start_sub_packet_u16(pkt)
1776 || !WPACKET_get_total_written(pkt, &startlen)
1777 || !WPACKET_reserve_bytes(pkt, MAX_COOKIE_SIZE, &cookie)
1778 || !WPACKET_put_bytes_u16(pkt, COOKIE_STATE_FORMAT_VERSION)
1779 || !WPACKET_put_bytes_u16(pkt, TLS1_3_VERSION)
1780 || !WPACKET_put_bytes_u16(pkt, s->s3->group_id)
1781 || !s->method->put_cipher_by_char(s->s3->tmp.new_cipher, pkt,
1782 &ciphlen)
1783 /* Is there a key_share extension present in this HRR? */
1784 || !WPACKET_put_bytes_u8(pkt, s->s3->peer_tmp == NULL)
1785 || !WPACKET_put_bytes_u32(pkt, (unsigned int)time(NULL))
1786 || !WPACKET_start_sub_packet_u16(pkt)
1787 || !WPACKET_reserve_bytes(pkt, EVP_MAX_MD_SIZE, &hashval1)) {
1788 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_STOC_COOKIE,
1789 ERR_R_INTERNAL_ERROR);
1790 return EXT_RETURN_FAIL;
1791 }
1792
1793 /*
1794 * Get the hash of the initial ClientHello. ssl_handshake_hash() operates
1795 * on raw buffers, so we first reserve sufficient bytes (above) and then
1796 * subsequently allocate them (below)
1797 */
1798 if (!ssl3_digest_cached_records(s, 0)
1799 || !ssl_handshake_hash(s, hashval1, EVP_MAX_MD_SIZE, &hashlen)) {
1800 /* SSLfatal() already called */
1801 return EXT_RETURN_FAIL;
1802 }
1803
1804 if (!WPACKET_allocate_bytes(pkt, hashlen, &hashval2)
1805 || !ossl_assert(hashval1 == hashval2)
1806 || !WPACKET_close(pkt)
1807 || !WPACKET_start_sub_packet_u8(pkt)
1808 || !WPACKET_reserve_bytes(pkt, SSL_COOKIE_LENGTH, &appcookie1)) {
1809 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_STOC_COOKIE,
1810 ERR_R_INTERNAL_ERROR);
1811 return EXT_RETURN_FAIL;
1812 }
1813
1814 /* Generate the application cookie */
1815 if (s->ctx->gen_stateless_cookie_cb(s, appcookie1, &appcookielen) == 0) {
1816 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_STOC_COOKIE,
1817 SSL_R_COOKIE_GEN_CALLBACK_FAILURE);
1818 return EXT_RETURN_FAIL;
1819 }
1820
1821 if (!WPACKET_allocate_bytes(pkt, appcookielen, &appcookie2)
1822 || !ossl_assert(appcookie1 == appcookie2)
1823 || !WPACKET_close(pkt)
1824 || !WPACKET_get_total_written(pkt, &totcookielen)
1825 || !WPACKET_reserve_bytes(pkt, SHA256_DIGEST_LENGTH, &hmac)) {
1826 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_STOC_COOKIE,
1827 ERR_R_INTERNAL_ERROR);
1828 return EXT_RETURN_FAIL;
1829 }
1830 hmaclen = SHA256_DIGEST_LENGTH;
1831
1832 totcookielen -= startlen;
1833 if (!ossl_assert(totcookielen <= MAX_COOKIE_SIZE - SHA256_DIGEST_LENGTH)) {
1834 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_STOC_COOKIE,
1835 ERR_R_INTERNAL_ERROR);
1836 return EXT_RETURN_FAIL;
1837 }
1838
1839 /* HMAC the cookie */
1840 hctx = EVP_MD_CTX_create();
1841 pkey = EVP_PKEY_new_raw_private_key(EVP_PKEY_HMAC, NULL,
1842 s->session_ctx->ext.cookie_hmac_key,
1843 sizeof(s->session_ctx->ext
1844 .cookie_hmac_key));
1845 if (hctx == NULL || pkey == NULL) {
1846 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_STOC_COOKIE,
1847 ERR_R_MALLOC_FAILURE);
1848 goto err;
1849 }
1850
1851 if (EVP_DigestSignInit(hctx, NULL, EVP_sha256(), NULL, pkey) <= 0
1852 || EVP_DigestSign(hctx, hmac, &hmaclen, cookie,
1853 totcookielen) <= 0) {
1854 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_STOC_COOKIE,
1855 ERR_R_INTERNAL_ERROR);
1856 goto err;
1857 }
1858
1859 if (!ossl_assert(totcookielen + hmaclen <= MAX_COOKIE_SIZE)) {
1860 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_STOC_COOKIE,
1861 ERR_R_INTERNAL_ERROR);
1862 goto err;
1863 }
1864
1865 if (!WPACKET_allocate_bytes(pkt, hmaclen, &hmac2)
1866 || !ossl_assert(hmac == hmac2)
1867 || !ossl_assert(cookie == hmac - totcookielen)
1868 || !WPACKET_close(pkt)
1869 || !WPACKET_close(pkt)) {
1870 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_STOC_COOKIE,
1871 ERR_R_INTERNAL_ERROR);
1872 goto err;
1873 }
1874
1875 ret = EXT_RETURN_SENT;
1876
1877 err:
1878 EVP_MD_CTX_free(hctx);
1879 EVP_PKEY_free(pkey);
1880 return ret;
1881 #else
1882 return EXT_RETURN_FAIL;
1883 #endif
1884 }
1885
tls_construct_stoc_cryptopro_bug(SSL * s,WPACKET * pkt,unsigned int context,X509 * x,size_t chainidx)1886 EXT_RETURN tls_construct_stoc_cryptopro_bug(SSL *s, WPACKET *pkt,
1887 unsigned int context, X509 *x,
1888 size_t chainidx)
1889 {
1890 const unsigned char cryptopro_ext[36] = {
1891 0xfd, 0xe8, /* 65000 */
1892 0x00, 0x20, /* 32 bytes length */
1893 0x30, 0x1e, 0x30, 0x08, 0x06, 0x06, 0x2a, 0x85,
1894 0x03, 0x02, 0x02, 0x09, 0x30, 0x08, 0x06, 0x06,
1895 0x2a, 0x85, 0x03, 0x02, 0x02, 0x16, 0x30, 0x08,
1896 0x06, 0x06, 0x2a, 0x85, 0x03, 0x02, 0x02, 0x17
1897 };
1898
1899 if (((s->s3->tmp.new_cipher->id & 0xFFFF) != 0x80
1900 && (s->s3->tmp.new_cipher->id & 0xFFFF) != 0x81)
1901 || (SSL_get_options(s) & SSL_OP_CRYPTOPRO_TLSEXT_BUG) == 0)
1902 return EXT_RETURN_NOT_SENT;
1903
1904 if (!WPACKET_memcpy(pkt, cryptopro_ext, sizeof(cryptopro_ext))) {
1905 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
1906 SSL_F_TLS_CONSTRUCT_STOC_CRYPTOPRO_BUG, ERR_R_INTERNAL_ERROR);
1907 return EXT_RETURN_FAIL;
1908 }
1909
1910 return EXT_RETURN_SENT;
1911 }
1912
tls_construct_stoc_early_data(SSL * s,WPACKET * pkt,unsigned int context,X509 * x,size_t chainidx)1913 EXT_RETURN tls_construct_stoc_early_data(SSL *s, WPACKET *pkt,
1914 unsigned int context, X509 *x,
1915 size_t chainidx)
1916 {
1917 if (context == SSL_EXT_TLS1_3_NEW_SESSION_TICKET) {
1918 if (s->max_early_data == 0)
1919 return EXT_RETURN_NOT_SENT;
1920
1921 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_early_data)
1922 || !WPACKET_start_sub_packet_u16(pkt)
1923 || !WPACKET_put_bytes_u32(pkt, s->max_early_data)
1924 || !WPACKET_close(pkt)) {
1925 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
1926 SSL_F_TLS_CONSTRUCT_STOC_EARLY_DATA, ERR_R_INTERNAL_ERROR);
1927 return EXT_RETURN_FAIL;
1928 }
1929
1930 return EXT_RETURN_SENT;
1931 }
1932
1933 if (s->ext.early_data != SSL_EARLY_DATA_ACCEPTED)
1934 return EXT_RETURN_NOT_SENT;
1935
1936 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_early_data)
1937 || !WPACKET_start_sub_packet_u16(pkt)
1938 || !WPACKET_close(pkt)) {
1939 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_STOC_EARLY_DATA,
1940 ERR_R_INTERNAL_ERROR);
1941 return EXT_RETURN_FAIL;
1942 }
1943
1944 return EXT_RETURN_SENT;
1945 }
1946
tls_construct_stoc_psk(SSL * s,WPACKET * pkt,unsigned int context,X509 * x,size_t chainidx)1947 EXT_RETURN tls_construct_stoc_psk(SSL *s, WPACKET *pkt, unsigned int context,
1948 X509 *x, size_t chainidx)
1949 {
1950 if (!s->hit)
1951 return EXT_RETURN_NOT_SENT;
1952
1953 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_psk)
1954 || !WPACKET_start_sub_packet_u16(pkt)
1955 || !WPACKET_put_bytes_u16(pkt, s->ext.tick_identity)
1956 || !WPACKET_close(pkt)) {
1957 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
1958 SSL_F_TLS_CONSTRUCT_STOC_PSK, ERR_R_INTERNAL_ERROR);
1959 return EXT_RETURN_FAIL;
1960 }
1961
1962 return EXT_RETURN_SENT;
1963 }
1964