2 * Copyright 2016-2017 The OpenSSL Project Authors. All Rights Reserved.
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
10 #include <openssl/ocsp.h>
11 #include "../ssl_locl.h"
12 #include "statem_locl.h"
15 * Parse the client's renegotiation binding and abort if it's not right
17 int tls_parse_ctos_renegotiate(SSL *s, PACKET *pkt, unsigned int context,
18 X509 *x, size_t chainidx, int *al)
21 const unsigned char *data;
23 /* Parse the length byte */
24 if (!PACKET_get_1(pkt, &ilen)
25 || !PACKET_get_bytes(pkt, &data, ilen)) {
26 SSLerr(SSL_F_TLS_PARSE_CTOS_RENEGOTIATE,
27 SSL_R_RENEGOTIATION_ENCODING_ERR);
28 *al = SSL_AD_DECODE_ERROR;
32 /* Check that the extension matches */
33 if (ilen != s->s3->previous_client_finished_len) {
34 SSLerr(SSL_F_TLS_PARSE_CTOS_RENEGOTIATE,
35 SSL_R_RENEGOTIATION_MISMATCH);
36 *al = SSL_AD_HANDSHAKE_FAILURE;
40 if (memcmp(data, s->s3->previous_client_finished,
41 s->s3->previous_client_finished_len)) {
42 SSLerr(SSL_F_TLS_PARSE_CTOS_RENEGOTIATE,
43 SSL_R_RENEGOTIATION_MISMATCH);
44 *al = SSL_AD_HANDSHAKE_FAILURE;
48 s->s3->send_connection_binding = 1;
54 * The servername extension is treated as follows:
56 * - Only the hostname type is supported with a maximum length of 255.
57 * - The servername is rejected if too long or if it contains zeros,
58 * in which case an fatal alert is generated.
59 * - The servername field is maintained together with the session cache.
60 * - When a session is resumed, the servername call back invoked in order
61 * to allow the application to position itself to the right context.
62 * - The servername is acknowledged if it is new for a session or when
63 * it is identical to a previously used for the same session.
64 * Applications can control the behaviour. They can at any time
65 * set a 'desirable' servername for a new SSL object. This can be the
66 * case for example with HTTPS when a Host: header field is received and
67 * a renegotiation is requested. In this case, a possible servername
68 * presented in the new client hello is only acknowledged if it matches
69 * the value of the Host: field.
70 * - Applications must use SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION
71 * if they provide for changing an explicit servername context for the
72 * session, i.e. when the session has been established with a servername
74 * - On session reconnect, the servername extension may be absent.
76 int tls_parse_ctos_server_name(SSL *s, PACKET *pkt, unsigned int context,
77 X509 *x, size_t chainidx, int *al)
79 unsigned int servname_type;
82 if (!PACKET_as_length_prefixed_2(pkt, &sni)
83 /* ServerNameList must be at least 1 byte long. */
84 || PACKET_remaining(&sni) == 0) {
85 *al = SSL_AD_DECODE_ERROR;
90 * Although the server_name extension was intended to be
91 * extensible to new name types, RFC 4366 defined the
92 * syntax inextensibly and OpenSSL 1.0.x parses it as
94 * RFC 6066 corrected the mistake but adding new name types
95 * is nevertheless no longer feasible, so act as if no other
96 * SNI types can exist, to simplify parsing.
98 * Also note that the RFC permits only one SNI value per type,
99 * i.e., we can only have a single hostname.
101 if (!PACKET_get_1(&sni, &servname_type)
102 || servname_type != TLSEXT_NAMETYPE_host_name
103 || !PACKET_as_length_prefixed_2(&sni, &hostname)) {
104 *al = SSL_AD_DECODE_ERROR;
109 if (PACKET_remaining(&hostname) > TLSEXT_MAXLEN_host_name) {
110 *al = TLS1_AD_UNRECOGNIZED_NAME;
114 if (PACKET_contains_zero_byte(&hostname)) {
115 *al = TLS1_AD_UNRECOGNIZED_NAME;
119 OPENSSL_free(s->session->ext.hostname);
120 s->session->ext.hostname = NULL;
121 if (!PACKET_strndup(&hostname, &s->session->ext.hostname)) {
122 *al = TLS1_AD_INTERNAL_ERROR;
126 s->servername_done = 1;
129 * TODO(openssl-team): if the SNI doesn't match, we MUST
130 * fall back to a full handshake.
132 s->servername_done = s->session->ext.hostname
133 && PACKET_equal(&hostname, s->session->ext.hostname,
134 strlen(s->session->ext.hostname));
140 #ifndef OPENSSL_NO_SRP
141 int tls_parse_ctos_srp(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
142 size_t chainidx, int *al)
146 if (!PACKET_as_length_prefixed_1(pkt, &srp_I)
147 || PACKET_contains_zero_byte(&srp_I)) {
148 *al = SSL_AD_DECODE_ERROR;
153 * TODO(openssl-team): currently, we re-authenticate the user
154 * upon resumption. Instead, we MUST ignore the login.
156 if (!PACKET_strndup(&srp_I, &s->srp_ctx.login)) {
157 *al = SSL_AD_INTERNAL_ERROR;
165 #ifndef OPENSSL_NO_EC
166 int tls_parse_ctos_ec_pt_formats(SSL *s, PACKET *pkt, unsigned int context,
167 X509 *x, size_t chainidx, int *al)
169 PACKET ec_point_format_list;
171 if (!PACKET_as_length_prefixed_1(pkt, &ec_point_format_list)
172 || PACKET_remaining(&ec_point_format_list) == 0) {
173 *al = SSL_AD_DECODE_ERROR;
178 if (!PACKET_memdup(&ec_point_format_list,
179 &s->session->ext.ecpointformats,
180 &s->session->ext.ecpointformats_len)) {
181 *al = SSL_AD_INTERNAL_ERROR;
188 #endif /* OPENSSL_NO_EC */
190 int tls_parse_ctos_session_ticket(SSL *s, PACKET *pkt, unsigned int context,
191 X509 *x, size_t chainidx, int *al)
193 if (s->ext.session_ticket_cb &&
194 !s->ext.session_ticket_cb(s, PACKET_data(pkt),
195 PACKET_remaining(pkt),
196 s->ext.session_ticket_cb_arg)) {
197 *al = SSL_AD_INTERNAL_ERROR;
204 int tls_parse_ctos_sig_algs(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
205 size_t chainidx, int *al)
207 PACKET supported_sig_algs;
209 if (!PACKET_as_length_prefixed_2(pkt, &supported_sig_algs)
210 || PACKET_remaining(&supported_sig_algs) == 0) {
211 *al = SSL_AD_DECODE_ERROR;
215 if (!s->hit && !tls1_save_sigalgs(s, &supported_sig_algs)) {
216 *al = SSL_AD_DECODE_ERROR;
223 #ifndef OPENSSL_NO_OCSP
224 int tls_parse_ctos_status_request(SSL *s, PACKET *pkt, unsigned int context,
225 X509 *x, size_t chainidx, int *al)
227 PACKET responder_id_list, exts;
229 /* Not defined if we get one of these in a client Certificate */
233 if (!PACKET_get_1(pkt, (unsigned int *)&s->ext.status_type)) {
234 *al = SSL_AD_DECODE_ERROR;
238 if (s->ext.status_type != TLSEXT_STATUSTYPE_ocsp) {
240 * We don't know what to do with any other type so ignore it.
242 s->ext.status_type = TLSEXT_STATUSTYPE_nothing;
246 if (!PACKET_get_length_prefixed_2 (pkt, &responder_id_list)) {
247 *al = SSL_AD_DECODE_ERROR;
252 * We remove any OCSP_RESPIDs from a previous handshake
253 * to prevent unbounded memory growth - CVE-2016-6304
255 sk_OCSP_RESPID_pop_free(s->ext.ocsp.ids, OCSP_RESPID_free);
256 if (PACKET_remaining(&responder_id_list) > 0) {
257 s->ext.ocsp.ids = sk_OCSP_RESPID_new_null();
258 if (s->ext.ocsp.ids == NULL) {
259 *al = SSL_AD_INTERNAL_ERROR;
263 s->ext.ocsp.ids = NULL;
266 while (PACKET_remaining(&responder_id_list) > 0) {
269 const unsigned char *id_data;
271 if (!PACKET_get_length_prefixed_2(&responder_id_list, &responder_id)
272 || PACKET_remaining(&responder_id) == 0) {
273 *al = SSL_AD_DECODE_ERROR;
277 id_data = PACKET_data(&responder_id);
278 /* TODO(size_t): Convert d2i_* to size_t */
279 id = d2i_OCSP_RESPID(NULL, &id_data,
280 (int)PACKET_remaining(&responder_id));
282 *al = SSL_AD_DECODE_ERROR;
286 if (id_data != PACKET_end(&responder_id)) {
287 OCSP_RESPID_free(id);
288 *al = SSL_AD_DECODE_ERROR;
292 if (!sk_OCSP_RESPID_push(s->ext.ocsp.ids, id)) {
293 OCSP_RESPID_free(id);
294 *al = SSL_AD_INTERNAL_ERROR;
299 /* Read in request_extensions */
300 if (!PACKET_as_length_prefixed_2(pkt, &exts)) {
301 *al = SSL_AD_DECODE_ERROR;
305 if (PACKET_remaining(&exts) > 0) {
306 const unsigned char *ext_data = PACKET_data(&exts);
308 sk_X509_EXTENSION_pop_free(s->ext.ocsp.exts,
309 X509_EXTENSION_free);
311 d2i_X509_EXTENSIONS(NULL, &ext_data, (int)PACKET_remaining(&exts));
312 if (s->ext.ocsp.exts == NULL || ext_data != PACKET_end(&exts)) {
313 *al = SSL_AD_DECODE_ERROR;
322 #ifndef OPENSSL_NO_NEXTPROTONEG
323 int tls_parse_ctos_npn(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
324 size_t chainidx, int *al)
327 * We shouldn't accept this extension on a
330 if (SSL_IS_FIRST_HANDSHAKE(s))
338 * Save the ALPN extension in a ClientHello.|pkt| holds the contents of the ALPN
339 * extension, not including type and length. |al| is a pointer to the alert
340 * value to send in the event of a failure. Returns: 1 on success, 0 on error.
342 int tls_parse_ctos_alpn(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
343 size_t chainidx, int *al)
345 PACKET protocol_list, save_protocol_list, protocol;
347 if (!SSL_IS_FIRST_HANDSHAKE(s))
350 if (!PACKET_as_length_prefixed_2(pkt, &protocol_list)
351 || PACKET_remaining(&protocol_list) < 2) {
352 *al = SSL_AD_DECODE_ERROR;
356 save_protocol_list = protocol_list;
358 /* Protocol names can't be empty. */
359 if (!PACKET_get_length_prefixed_1(&protocol_list, &protocol)
360 || PACKET_remaining(&protocol) == 0) {
361 *al = SSL_AD_DECODE_ERROR;
364 } while (PACKET_remaining(&protocol_list) != 0);
366 OPENSSL_free(s->s3->alpn_proposed);
367 s->s3->alpn_proposed = NULL;
368 s->s3->alpn_proposed_len = 0;
369 if (!PACKET_memdup(&save_protocol_list,
370 &s->s3->alpn_proposed, &s->s3->alpn_proposed_len)) {
371 *al = SSL_AD_INTERNAL_ERROR;
378 #ifndef OPENSSL_NO_SRTP
379 int tls_parse_ctos_use_srtp(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
380 size_t chainidx, int *al)
382 STACK_OF(SRTP_PROTECTION_PROFILE) *srvr;
383 unsigned int ct, mki_len, id;
387 /* Ignore this if we have no SRTP profiles */
388 if (SSL_get_srtp_profiles(s) == NULL)
391 /* Pull off the length of the cipher suite list and check it is even */
392 if (!PACKET_get_net_2(pkt, &ct) || (ct & 1) != 0
393 || !PACKET_get_sub_packet(pkt, &subpkt, ct)) {
394 SSLerr(SSL_F_TLS_PARSE_CTOS_USE_SRTP,
395 SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST);
396 *al = SSL_AD_DECODE_ERROR;
400 srvr = SSL_get_srtp_profiles(s);
401 s->srtp_profile = NULL;
402 /* Search all profiles for a match initially */
403 srtp_pref = sk_SRTP_PROTECTION_PROFILE_num(srvr);
405 while (PACKET_remaining(&subpkt)) {
406 if (!PACKET_get_net_2(&subpkt, &id)) {
407 SSLerr(SSL_F_TLS_PARSE_CTOS_USE_SRTP,
408 SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST);
409 *al = SSL_AD_DECODE_ERROR;
414 * Only look for match in profiles of higher preference than
416 * If no profiles have been have been configured then this
419 for (i = 0; i < srtp_pref; i++) {
420 SRTP_PROTECTION_PROFILE *sprof =
421 sk_SRTP_PROTECTION_PROFILE_value(srvr, i);
423 if (sprof->id == id) {
424 s->srtp_profile = sprof;
431 /* Now extract the MKI value as a sanity check, but discard it for now */
432 if (!PACKET_get_1(pkt, &mki_len)) {
433 SSLerr(SSL_F_TLS_PARSE_CTOS_USE_SRTP,
434 SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST);
435 *al = SSL_AD_DECODE_ERROR;
439 if (!PACKET_forward(pkt, mki_len)
440 || PACKET_remaining(pkt)) {
441 SSLerr(SSL_F_TLS_PARSE_CTOS_USE_SRTP, SSL_R_BAD_SRTP_MKI_VALUE);
442 *al = SSL_AD_DECODE_ERROR;
450 int tls_parse_ctos_etm(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
451 size_t chainidx, int *al)
453 if (!(s->options & SSL_OP_NO_ENCRYPT_THEN_MAC))
460 * Process a psk_kex_modes extension received in the ClientHello. |pkt| contains
461 * the raw PACKET data for the extension. Returns 1 on success or 0 on failure.
462 * If a failure occurs then |*al| is set to an appropriate alert value.
464 int tls_parse_ctos_psk_kex_modes(SSL *s, PACKET *pkt, unsigned int context,
465 X509 *x, size_t chainidx, int *al)
467 #ifndef OPENSSL_NO_TLS1_3
468 PACKET psk_kex_modes;
471 if (!PACKET_as_length_prefixed_1(pkt, &psk_kex_modes)
472 || PACKET_remaining(&psk_kex_modes) == 0) {
473 *al = SSL_AD_DECODE_ERROR;
477 while (PACKET_get_1(&psk_kex_modes, &mode)) {
478 if (mode == TLSEXT_KEX_MODE_KE_DHE)
479 s->ext.psk_kex_mode |= TLSEXT_KEX_MODE_FLAG_KE_DHE;
480 else if (mode == TLSEXT_KEX_MODE_KE
481 && (s->options & SSL_OP_ALLOW_NO_DHE_KEX) != 0)
482 s->ext.psk_kex_mode |= TLSEXT_KEX_MODE_FLAG_KE;
490 * Process a key_share extension received in the ClientHello. |pkt| contains
491 * the raw PACKET data for the extension. Returns 1 on success or 0 on failure.
492 * If a failure occurs then |*al| is set to an appropriate alert value.
494 int tls_parse_ctos_key_share(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
495 size_t chainidx, int *al)
497 #ifndef OPENSSL_NO_TLS1_3
498 unsigned int group_id;
499 PACKET key_share_list, encoded_pt;
500 const unsigned char *clntcurves, *srvrcurves;
501 size_t clnt_num_curves, srvr_num_curves;
502 int group_nid, found = 0;
503 unsigned int curve_flags;
505 if (s->hit && (s->ext.psk_kex_mode & TLSEXT_KEX_MODE_FLAG_KE_DHE) == 0)
509 if (s->s3->peer_tmp != NULL) {
510 *al = SSL_AD_INTERNAL_ERROR;
511 SSLerr(SSL_F_TLS_PARSE_CTOS_KEY_SHARE, ERR_R_INTERNAL_ERROR);
515 if (!PACKET_as_length_prefixed_2(pkt, &key_share_list)) {
516 *al = SSL_AD_DECODE_ERROR;
517 SSLerr(SSL_F_TLS_PARSE_CTOS_KEY_SHARE, SSL_R_LENGTH_MISMATCH);
521 /* Get our list of supported curves */
522 if (!tls1_get_curvelist(s, 0, &srvrcurves, &srvr_num_curves)) {
523 *al = SSL_AD_INTERNAL_ERROR;
524 SSLerr(SSL_F_TLS_PARSE_CTOS_KEY_SHARE, ERR_R_INTERNAL_ERROR);
528 /* Get the clients list of supported curves. */
529 if (!tls1_get_curvelist(s, 1, &clntcurves, &clnt_num_curves)) {
530 *al = SSL_AD_INTERNAL_ERROR;
531 SSLerr(SSL_F_TLS_PARSE_CTOS_KEY_SHARE, ERR_R_INTERNAL_ERROR);
534 if (clnt_num_curves == 0) {
536 * This can only happen if the supported_groups extension was not sent,
537 * because we verify that the length is non-zero when we process that
540 *al = SSL_AD_MISSING_EXTENSION;
541 SSLerr(SSL_F_TLS_PARSE_CTOS_KEY_SHARE,
542 SSL_R_MISSING_SUPPORTED_GROUPS_EXTENSION);
546 while (PACKET_remaining(&key_share_list) > 0) {
547 if (!PACKET_get_net_2(&key_share_list, &group_id)
548 || !PACKET_get_length_prefixed_2(&key_share_list, &encoded_pt)
549 || PACKET_remaining(&encoded_pt) == 0) {
550 *al = SSL_AD_DECODE_ERROR;
551 SSLerr(SSL_F_TLS_PARSE_CTOS_KEY_SHARE,
552 SSL_R_LENGTH_MISMATCH);
557 * If we already found a suitable key_share we loop through the
558 * rest to verify the structure, but don't process them.
563 /* Check if this share is in supported_groups sent from client */
564 if (!check_in_list(s, group_id, clntcurves, clnt_num_curves, 0)) {
565 *al = SSL_AD_ILLEGAL_PARAMETER;
566 SSLerr(SSL_F_TLS_PARSE_CTOS_KEY_SHARE, SSL_R_BAD_KEY_SHARE);
570 /* Check if this share is for a group we can use */
571 if (!check_in_list(s, group_id, srvrcurves, srvr_num_curves, 1)) {
572 /* Share not suitable */
576 group_nid = tls1_ec_curve_id2nid(group_id, &curve_flags);
578 if (group_nid == 0) {
579 *al = SSL_AD_INTERNAL_ERROR;
580 SSLerr(SSL_F_TLS_PARSE_CTOS_KEY_SHARE,
581 SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS);
585 if ((curve_flags & TLS_CURVE_TYPE) == TLS_CURVE_CUSTOM) {
586 /* Can happen for some curves, e.g. X25519 */
587 EVP_PKEY *key = EVP_PKEY_new();
589 if (key == NULL || !EVP_PKEY_set_type(key, group_nid)) {
590 *al = SSL_AD_INTERNAL_ERROR;
591 SSLerr(SSL_F_TLS_PARSE_CTOS_KEY_SHARE, ERR_R_EVP_LIB);
595 s->s3->peer_tmp = key;
597 /* Set up EVP_PKEY with named curve as parameters */
598 EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new_id(EVP_PKEY_EC, NULL);
601 || EVP_PKEY_paramgen_init(pctx) <= 0
602 || EVP_PKEY_CTX_set_ec_paramgen_curve_nid(pctx,
604 || EVP_PKEY_paramgen(pctx, &s->s3->peer_tmp) <= 0) {
605 *al = SSL_AD_INTERNAL_ERROR;
606 SSLerr(SSL_F_TLS_PARSE_CTOS_KEY_SHARE, ERR_R_EVP_LIB);
607 EVP_PKEY_CTX_free(pctx);
610 EVP_PKEY_CTX_free(pctx);
613 s->s3->group_id = group_id;
615 if (!EVP_PKEY_set1_tls_encodedpoint(s->s3->peer_tmp,
616 PACKET_data(&encoded_pt),
617 PACKET_remaining(&encoded_pt))) {
618 *al = SSL_AD_ILLEGAL_PARAMETER;
619 SSLerr(SSL_F_TLS_PARSE_CTOS_KEY_SHARE, SSL_R_BAD_ECPOINT);
630 #ifndef OPENSSL_NO_EC
631 int tls_parse_ctos_supported_groups(SSL *s, PACKET *pkt, unsigned int context,
632 X509 *x, size_t chainidx, int *al)
634 PACKET supported_groups_list;
636 /* Each group is 2 bytes and we must have at least 1. */
637 if (!PACKET_as_length_prefixed_2(pkt, &supported_groups_list)
638 || PACKET_remaining(&supported_groups_list) == 0
639 || (PACKET_remaining(&supported_groups_list) % 2) != 0) {
640 *al = SSL_AD_DECODE_ERROR;
644 OPENSSL_free(s->session->ext.supportedgroups);
645 s->session->ext.supportedgroups = NULL;
646 s->session->ext.supportedgroups_len = 0;
647 if (!PACKET_memdup(&supported_groups_list,
648 &s->session->ext.supportedgroups,
649 &s->session->ext.supportedgroups_len)) {
650 *al = SSL_AD_INTERNAL_ERROR;
658 int tls_parse_ctos_ems(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
659 size_t chainidx, int *al)
661 /* The extension must always be empty */
662 if (PACKET_remaining(pkt) != 0) {
663 *al = SSL_AD_DECODE_ERROR;
667 s->s3->flags |= TLS1_FLAGS_RECEIVED_EXTMS;
673 int tls_parse_ctos_early_data(SSL *s, PACKET *pkt, unsigned int context,
674 X509 *x, size_t chainidx, int *al)
676 if (PACKET_remaining(pkt) != 0) {
677 *al = SSL_AD_DECODE_ERROR;
684 int tls_parse_ctos_psk(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
685 size_t chainidx, int *al)
687 PACKET identities, binders, binder;
688 size_t binderoffset, hashsize;
689 SSL_SESSION *sess = NULL;
690 unsigned int id, i, ext = 0;
691 const EVP_MD *md = NULL;
694 * If we have no PSK kex mode that we recognise then we can't resume so
695 * ignore this extension
697 if ((s->ext.psk_kex_mode
698 & (TLSEXT_KEX_MODE_FLAG_KE | TLSEXT_KEX_MODE_FLAG_KE_DHE)) == 0)
701 if (!PACKET_get_length_prefixed_2(pkt, &identities)) {
702 *al = SSL_AD_DECODE_ERROR;
706 for (id = 0; PACKET_remaining(&identities) != 0; id++) {
708 unsigned long ticket_agel;
710 if (!PACKET_get_length_prefixed_2(&identities, &identity)
711 || !PACKET_get_net_4(&identities, &ticket_agel)) {
712 *al = SSL_AD_DECODE_ERROR;
716 if (s->psk_find_session_cb != NULL
717 && !s->psk_find_session_cb(s, PACKET_data(&identity),
718 PACKET_remaining(&identity),
720 *al = SSL_AD_INTERNAL_ERROR;
726 SSL_SESSION *sesstmp = ssl_session_dup(sess, 0);
728 if (sesstmp == NULL) {
729 *al = SSL_AD_INTERNAL_ERROR;
732 SSL_SESSION_free(sess);
736 * We've just been told to use this session for this context so
737 * make sure the sid_ctx matches up.
739 memcpy(sess->sid_ctx, s->sid_ctx, s->sid_ctx_length);
740 sess->sid_ctx_length = s->sid_ctx_length;
743 uint32_t ticket_age = 0, now, agesec, agems;
744 int ret = tls_decrypt_ticket(s, PACKET_data(&identity),
745 PACKET_remaining(&identity), NULL, 0,
748 if (ret == TICKET_FATAL_ERR_MALLOC
749 || ret == TICKET_FATAL_ERR_OTHER) {
750 *al = SSL_AD_INTERNAL_ERROR;
753 if (ret == TICKET_NO_DECRYPT)
756 ticket_age = (uint32_t)ticket_agel;
757 now = (uint32_t)time(NULL);
758 agesec = now - (uint32_t)sess->time;
759 agems = agesec * (uint32_t)1000;
760 ticket_age -= sess->ext.tick_age_add;
763 * For simplicity we do our age calculations in seconds. If the
764 * client does it in ms then it could appear that their ticket age
765 * is longer than ours (our ticket age calculation should always be
766 * slightly longer than the client's due to the network latency).
767 * Therefore we add 1000ms to our age calculation to adjust for
770 if (sess->timeout >= (long)agesec
771 && agems / (uint32_t)1000 == agesec
772 && ticket_age <= agems + 1000
773 && ticket_age + TICKET_AGE_ALLOWANCE >= agems + 1000) {
775 * Ticket age is within tolerance and not expired. We allow it
778 s->ext.early_data_ok = 1;
782 md = ssl_md(sess->cipher->algorithm2);
783 if (md != ssl_md(s->s3->tmp.new_cipher->algorithm2)) {
784 /* The ciphersuite is not compatible with this session. */
785 SSL_SESSION_free(sess);
795 binderoffset = PACKET_data(pkt) - (const unsigned char *)s->init_buf->data;
796 hashsize = EVP_MD_size(md);
798 if (!PACKET_get_length_prefixed_2(pkt, &binders)) {
799 *al = SSL_AD_DECODE_ERROR;
803 for (i = 0; i <= id; i++) {
804 if (!PACKET_get_length_prefixed_1(&binders, &binder)) {
805 *al = SSL_AD_DECODE_ERROR;
810 if (PACKET_remaining(&binder) != hashsize
811 || tls_psk_do_binder(s, md,
812 (const unsigned char *)s->init_buf->data,
813 binderoffset, PACKET_data(&binder), NULL,
814 sess, 0, ext) != 1) {
815 *al = SSL_AD_DECODE_ERROR;
816 SSLerr(SSL_F_TLS_PARSE_CTOS_PSK, ERR_R_INTERNAL_ERROR);
820 sess->ext.tick_identity = id;
822 SSL_SESSION_free(s->session);
826 SSL_SESSION_free(sess);
831 * Add the server's renegotiation binding
833 EXT_RETURN tls_construct_stoc_renegotiate(SSL *s, WPACKET *pkt,
834 unsigned int context, X509 *x,
835 size_t chainidx, int *al)
837 if (!s->s3->send_connection_binding)
838 return EXT_RETURN_NOT_SENT;
840 /* Still add this even if SSL_OP_NO_RENEGOTIATION is set */
841 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_renegotiate)
842 || !WPACKET_start_sub_packet_u16(pkt)
843 || !WPACKET_start_sub_packet_u8(pkt)
844 || !WPACKET_memcpy(pkt, s->s3->previous_client_finished,
845 s->s3->previous_client_finished_len)
846 || !WPACKET_memcpy(pkt, s->s3->previous_server_finished,
847 s->s3->previous_server_finished_len)
848 || !WPACKET_close(pkt)
849 || !WPACKET_close(pkt)) {
850 SSLerr(SSL_F_TLS_CONSTRUCT_STOC_RENEGOTIATE, ERR_R_INTERNAL_ERROR);
851 return EXT_RETURN_FAIL;
854 return EXT_RETURN_SENT;
857 EXT_RETURN tls_construct_stoc_server_name(SSL *s, WPACKET *pkt,
858 unsigned int context, X509 *x,
859 size_t chainidx, int *al)
861 if (s->hit || s->servername_done != 1
862 || s->session->ext.hostname == NULL)
863 return EXT_RETURN_NOT_SENT;
865 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_server_name)
866 || !WPACKET_put_bytes_u16(pkt, 0)) {
867 SSLerr(SSL_F_TLS_CONSTRUCT_STOC_SERVER_NAME, ERR_R_INTERNAL_ERROR);
868 return EXT_RETURN_FAIL;
871 return EXT_RETURN_SENT;
874 #ifndef OPENSSL_NO_EC
875 EXT_RETURN tls_construct_stoc_ec_pt_formats(SSL *s, WPACKET *pkt,
876 unsigned int context, X509 *x,
877 size_t chainidx, int *al)
879 unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
880 unsigned long alg_a = s->s3->tmp.new_cipher->algorithm_auth;
881 int using_ecc = ((alg_k & SSL_kECDHE) || (alg_a & SSL_aECDSA))
882 && (s->session->ext.ecpointformats != NULL);
883 const unsigned char *plist;
887 return EXT_RETURN_NOT_SENT;
889 tls1_get_formatlist(s, &plist, &plistlen);
890 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_ec_point_formats)
891 || !WPACKET_start_sub_packet_u16(pkt)
892 || !WPACKET_sub_memcpy_u8(pkt, plist, plistlen)
893 || !WPACKET_close(pkt)) {
894 SSLerr(SSL_F_TLS_CONSTRUCT_STOC_EC_PT_FORMATS, ERR_R_INTERNAL_ERROR);
895 return EXT_RETURN_FAIL;
898 return EXT_RETURN_SENT;
902 #ifndef OPENSSL_NO_EC
903 EXT_RETURN tls_construct_stoc_supported_groups(SSL *s, WPACKET *pkt,
904 unsigned int context, X509 *x,
905 size_t chainidx, int *al)
907 const unsigned char *groups;
908 size_t numgroups, i, first = 1;
910 /* s->s3->group_id is non zero if we accepted a key_share */
911 if (s->s3->group_id == 0)
912 return EXT_RETURN_NOT_SENT;
914 /* Get our list of supported groups */
915 if (!tls1_get_curvelist(s, 0, &groups, &numgroups) || numgroups == 0) {
916 SSLerr(SSL_F_TLS_CONSTRUCT_STOC_SUPPORTED_GROUPS, ERR_R_INTERNAL_ERROR);
917 return EXT_RETURN_FAIL;
920 /* Copy group ID if supported */
921 for (i = 0; i < numgroups; i++, groups += 2) {
922 if (tls_curve_allowed(s, groups, SSL_SECOP_CURVE_SUPPORTED)) {
925 * Check if the client is already using our preferred group. If
926 * so we don't need to add this extension
928 if (s->s3->group_id == GET_GROUP_ID(groups, 0))
929 return EXT_RETURN_NOT_SENT;
931 /* Add extension header */
932 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_supported_groups)
933 /* Sub-packet for supported_groups extension */
934 || !WPACKET_start_sub_packet_u16(pkt)
935 || !WPACKET_start_sub_packet_u16(pkt)) {
936 SSLerr(SSL_F_TLS_CONSTRUCT_STOC_SUPPORTED_GROUPS,
937 ERR_R_INTERNAL_ERROR);
938 return EXT_RETURN_FAIL;
943 if (!WPACKET_put_bytes_u16(pkt, GET_GROUP_ID(groups, 0))) {
944 SSLerr(SSL_F_TLS_CONSTRUCT_STOC_SUPPORTED_GROUPS,
945 ERR_R_INTERNAL_ERROR);
946 return EXT_RETURN_FAIL;
951 if (!WPACKET_close(pkt) || !WPACKET_close(pkt)) {
952 SSLerr(SSL_F_TLS_CONSTRUCT_STOC_SUPPORTED_GROUPS, ERR_R_INTERNAL_ERROR);
953 return EXT_RETURN_FAIL;
956 return EXT_RETURN_SENT;
960 EXT_RETURN tls_construct_stoc_session_ticket(SSL *s, WPACKET *pkt,
961 unsigned int context, X509 *x,
962 size_t chainidx, int *al)
964 if (!s->ext.ticket_expected || !tls_use_ticket(s)) {
965 s->ext.ticket_expected = 0;
966 return EXT_RETURN_NOT_SENT;
969 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_session_ticket)
970 || !WPACKET_put_bytes_u16(pkt, 0)) {
971 SSLerr(SSL_F_TLS_CONSTRUCT_STOC_SESSION_TICKET, ERR_R_INTERNAL_ERROR);
972 return EXT_RETURN_FAIL;
975 return EXT_RETURN_SENT;
978 #ifndef OPENSSL_NO_OCSP
979 EXT_RETURN tls_construct_stoc_status_request(SSL *s, WPACKET *pkt,
980 unsigned int context, X509 *x,
981 size_t chainidx, int *al)
983 if (!s->ext.status_expected)
984 return EXT_RETURN_NOT_SENT;
986 if (SSL_IS_TLS13(s) && chainidx != 0)
987 return EXT_RETURN_NOT_SENT;
989 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_status_request)
990 || !WPACKET_start_sub_packet_u16(pkt)) {
991 SSLerr(SSL_F_TLS_CONSTRUCT_STOC_STATUS_REQUEST, ERR_R_INTERNAL_ERROR);
992 return EXT_RETURN_FAIL;
996 * In TLSv1.3 we include the certificate status itself. In <= TLSv1.2 we
997 * send back an empty extension, with the certificate status appearing as a
1000 if ((SSL_IS_TLS13(s) && !tls_construct_cert_status_body(s, pkt))
1001 || !WPACKET_close(pkt)) {
1002 SSLerr(SSL_F_TLS_CONSTRUCT_STOC_STATUS_REQUEST, ERR_R_INTERNAL_ERROR);
1003 return EXT_RETURN_FAIL;
1006 return EXT_RETURN_SENT;
1010 #ifndef OPENSSL_NO_NEXTPROTONEG
1011 EXT_RETURN tls_construct_stoc_next_proto_neg(SSL *s, WPACKET *pkt,
1012 unsigned int context, X509 *x,
1013 size_t chainidx, int *al)
1015 const unsigned char *npa;
1016 unsigned int npalen;
1018 int npn_seen = s->s3->npn_seen;
1020 s->s3->npn_seen = 0;
1021 if (!npn_seen || s->ctx->ext.npn_advertised_cb == NULL)
1022 return EXT_RETURN_NOT_SENT;
1024 ret = s->ctx->ext.npn_advertised_cb(s, &npa, &npalen,
1025 s->ctx->ext.npn_advertised_cb_arg);
1026 if (ret == SSL_TLSEXT_ERR_OK) {
1027 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_next_proto_neg)
1028 || !WPACKET_sub_memcpy_u16(pkt, npa, npalen)) {
1029 SSLerr(SSL_F_TLS_CONSTRUCT_STOC_NEXT_PROTO_NEG,
1030 ERR_R_INTERNAL_ERROR);
1031 return EXT_RETURN_FAIL;
1033 s->s3->npn_seen = 1;
1036 return EXT_RETURN_SENT;
1040 EXT_RETURN tls_construct_stoc_alpn(SSL *s, WPACKET *pkt, unsigned int context,
1041 X509 *x, size_t chainidx, int *al)
1043 if (s->s3->alpn_selected == NULL)
1044 return EXT_RETURN_NOT_SENT;
1046 if (!WPACKET_put_bytes_u16(pkt,
1047 TLSEXT_TYPE_application_layer_protocol_negotiation)
1048 || !WPACKET_start_sub_packet_u16(pkt)
1049 || !WPACKET_start_sub_packet_u16(pkt)
1050 || !WPACKET_sub_memcpy_u8(pkt, s->s3->alpn_selected,
1051 s->s3->alpn_selected_len)
1052 || !WPACKET_close(pkt)
1053 || !WPACKET_close(pkt)) {
1054 SSLerr(SSL_F_TLS_CONSTRUCT_STOC_ALPN, ERR_R_INTERNAL_ERROR);
1055 return EXT_RETURN_FAIL;
1058 return EXT_RETURN_SENT;
1061 #ifndef OPENSSL_NO_SRTP
1062 EXT_RETURN tls_construct_stoc_use_srtp(SSL *s, WPACKET *pkt,
1063 unsigned int context, X509 *x,
1064 size_t chainidx, int *al)
1066 if (s->srtp_profile == NULL)
1067 return EXT_RETURN_NOT_SENT;
1069 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_use_srtp)
1070 || !WPACKET_start_sub_packet_u16(pkt)
1071 || !WPACKET_put_bytes_u16(pkt, 2)
1072 || !WPACKET_put_bytes_u16(pkt, s->srtp_profile->id)
1073 || !WPACKET_put_bytes_u8(pkt, 0)
1074 || !WPACKET_close(pkt)) {
1075 SSLerr(SSL_F_TLS_CONSTRUCT_STOC_USE_SRTP, ERR_R_INTERNAL_ERROR);
1076 return EXT_RETURN_FAIL;
1079 return EXT_RETURN_SENT;
1083 EXT_RETURN tls_construct_stoc_etm(SSL *s, WPACKET *pkt, unsigned int context,
1084 X509 *x, size_t chainidx, int *al)
1086 if (!s->ext.use_etm)
1087 return EXT_RETURN_NOT_SENT;
1090 * Don't use encrypt_then_mac if AEAD or RC4 might want to disable
1091 * for other cases too.
1093 if (s->s3->tmp.new_cipher->algorithm_mac == SSL_AEAD
1094 || s->s3->tmp.new_cipher->algorithm_enc == SSL_RC4
1095 || s->s3->tmp.new_cipher->algorithm_enc == SSL_eGOST2814789CNT
1096 || s->s3->tmp.new_cipher->algorithm_enc == SSL_eGOST2814789CNT12) {
1098 return EXT_RETURN_NOT_SENT;
1101 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_encrypt_then_mac)
1102 || !WPACKET_put_bytes_u16(pkt, 0)) {
1103 SSLerr(SSL_F_TLS_CONSTRUCT_STOC_ETM, ERR_R_INTERNAL_ERROR);
1104 return EXT_RETURN_FAIL;
1107 return EXT_RETURN_SENT;
1110 EXT_RETURN tls_construct_stoc_ems(SSL *s, WPACKET *pkt, unsigned int context,
1111 X509 *x, size_t chainidx, int *al)
1113 if ((s->s3->flags & TLS1_FLAGS_RECEIVED_EXTMS) == 0)
1114 return EXT_RETURN_NOT_SENT;
1116 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_extended_master_secret)
1117 || !WPACKET_put_bytes_u16(pkt, 0)) {
1118 SSLerr(SSL_F_TLS_CONSTRUCT_STOC_EMS, ERR_R_INTERNAL_ERROR);
1119 return EXT_RETURN_FAIL;
1122 return EXT_RETURN_SENT;
1125 EXT_RETURN tls_construct_stoc_key_share(SSL *s, WPACKET *pkt,
1126 unsigned int context, X509 *x,
1127 size_t chainidx, int *al)
1129 #ifndef OPENSSL_NO_TLS1_3
1130 unsigned char *encodedPoint;
1131 size_t encoded_pt_len = 0;
1132 EVP_PKEY *ckey = s->s3->peer_tmp, *skey = NULL;
1135 /* No key_share received from client */
1136 if (s->hello_retry_request) {
1137 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_key_share)
1138 || !WPACKET_start_sub_packet_u16(pkt)
1139 || !WPACKET_put_bytes_u16(pkt, s->s3->group_id)
1140 || !WPACKET_close(pkt)) {
1141 SSLerr(SSL_F_TLS_CONSTRUCT_STOC_KEY_SHARE,
1142 ERR_R_INTERNAL_ERROR);
1143 return EXT_RETURN_FAIL;
1146 return EXT_RETURN_SENT;
1149 /* Must be resuming. */
1150 if (!s->hit || !tls13_generate_handshake_secret(s, NULL, 0)) {
1151 *al = SSL_AD_INTERNAL_ERROR;
1152 SSLerr(SSL_F_TLS_CONSTRUCT_STOC_KEY_SHARE, ERR_R_INTERNAL_ERROR);
1153 return EXT_RETURN_FAIL;
1155 return EXT_RETURN_NOT_SENT;
1158 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_key_share)
1159 || !WPACKET_start_sub_packet_u16(pkt)
1160 || !WPACKET_put_bytes_u16(pkt, s->s3->group_id)) {
1161 SSLerr(SSL_F_TLS_CONSTRUCT_STOC_KEY_SHARE, ERR_R_INTERNAL_ERROR);
1162 return EXT_RETURN_FAIL;
1165 skey = ssl_generate_pkey(ckey);
1167 SSLerr(SSL_F_TLS_CONSTRUCT_STOC_KEY_SHARE, ERR_R_MALLOC_FAILURE);
1168 return EXT_RETURN_FAIL;
1171 /* Generate encoding of server key */
1172 encoded_pt_len = EVP_PKEY_get1_tls_encodedpoint(skey, &encodedPoint);
1173 if (encoded_pt_len == 0) {
1174 SSLerr(SSL_F_TLS_CONSTRUCT_STOC_KEY_SHARE, ERR_R_EC_LIB);
1175 EVP_PKEY_free(skey);
1176 return EXT_RETURN_FAIL;
1179 if (!WPACKET_sub_memcpy_u16(pkt, encodedPoint, encoded_pt_len)
1180 || !WPACKET_close(pkt)) {
1181 SSLerr(SSL_F_TLS_CONSTRUCT_STOC_KEY_SHARE, ERR_R_INTERNAL_ERROR);
1182 EVP_PKEY_free(skey);
1183 OPENSSL_free(encodedPoint);
1184 return EXT_RETURN_FAIL;
1186 OPENSSL_free(encodedPoint);
1188 /* This causes the crypto state to be updated based on the derived keys */
1189 s->s3->tmp.pkey = skey;
1190 if (ssl_derive(s, skey, ckey, 1) == 0) {
1191 SSLerr(SSL_F_TLS_CONSTRUCT_STOC_KEY_SHARE, ERR_R_INTERNAL_ERROR);
1192 return EXT_RETURN_FAIL;
1196 return EXT_RETURN_SENT;
1199 EXT_RETURN tls_construct_stoc_cryptopro_bug(SSL *s, WPACKET *pkt,
1200 unsigned int context, X509 *x,
1201 size_t chainidx, int *al)
1203 const unsigned char cryptopro_ext[36] = {
1204 0xfd, 0xe8, /* 65000 */
1205 0x00, 0x20, /* 32 bytes length */
1206 0x30, 0x1e, 0x30, 0x08, 0x06, 0x06, 0x2a, 0x85,
1207 0x03, 0x02, 0x02, 0x09, 0x30, 0x08, 0x06, 0x06,
1208 0x2a, 0x85, 0x03, 0x02, 0x02, 0x16, 0x30, 0x08,
1209 0x06, 0x06, 0x2a, 0x85, 0x03, 0x02, 0x02, 0x17
1212 if (((s->s3->tmp.new_cipher->id & 0xFFFF) != 0x80
1213 && (s->s3->tmp.new_cipher->id & 0xFFFF) != 0x81)
1214 || (SSL_get_options(s) & SSL_OP_CRYPTOPRO_TLSEXT_BUG) == 0)
1215 return EXT_RETURN_NOT_SENT;
1217 if (!WPACKET_memcpy(pkt, cryptopro_ext, sizeof(cryptopro_ext))) {
1218 SSLerr(SSL_F_TLS_CONSTRUCT_STOC_CRYPTOPRO_BUG, ERR_R_INTERNAL_ERROR);
1219 return EXT_RETURN_FAIL;
1222 return EXT_RETURN_SENT;
1225 EXT_RETURN tls_construct_stoc_early_data(SSL *s, WPACKET *pkt,
1226 unsigned int context, X509 *x,
1227 size_t chainidx, int *al)
1229 if (context == SSL_EXT_TLS1_3_NEW_SESSION_TICKET) {
1230 if (s->max_early_data == 0)
1231 return EXT_RETURN_NOT_SENT;
1233 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_early_data)
1234 || !WPACKET_start_sub_packet_u16(pkt)
1235 || !WPACKET_put_bytes_u32(pkt, s->max_early_data)
1236 || !WPACKET_close(pkt)) {
1237 SSLerr(SSL_F_TLS_CONSTRUCT_STOC_EARLY_DATA, ERR_R_INTERNAL_ERROR);
1238 return EXT_RETURN_FAIL;
1241 return EXT_RETURN_SENT;
1244 if (s->ext.early_data != SSL_EARLY_DATA_ACCEPTED)
1245 return EXT_RETURN_NOT_SENT;
1247 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_early_data)
1248 || !WPACKET_start_sub_packet_u16(pkt)
1249 || !WPACKET_close(pkt)) {
1250 SSLerr(SSL_F_TLS_CONSTRUCT_STOC_EARLY_DATA, ERR_R_INTERNAL_ERROR);
1251 return EXT_RETURN_FAIL;
1254 return EXT_RETURN_SENT;
1257 EXT_RETURN tls_construct_stoc_psk(SSL *s, WPACKET *pkt, unsigned int context,
1258 X509 *x, size_t chainidx, int *al)
1261 return EXT_RETURN_NOT_SENT;
1263 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_psk)
1264 || !WPACKET_start_sub_packet_u16(pkt)
1265 || !WPACKET_put_bytes_u16(pkt, s->session->ext.tick_identity)
1266 || !WPACKET_close(pkt)) {
1267 SSLerr(SSL_F_TLS_CONSTRUCT_STOC_PSK, ERR_R_INTERNAL_ERROR);
1268 return EXT_RETURN_FAIL;
1271 return EXT_RETURN_SENT;