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->ext.psk_kex_mode |= TLSEXT_KEX_MODE_FLAG_KE;
489 * Process a key_share extension received in the ClientHello. |pkt| contains
490 * the raw PACKET data for the extension. Returns 1 on success or 0 on failure.
491 * If a failure occurs then |*al| is set to an appropriate alert value.
493 int tls_parse_ctos_key_share(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
494 size_t chainidx, int *al)
496 #ifndef OPENSSL_NO_TLS1_3
497 unsigned int group_id;
498 PACKET key_share_list, encoded_pt;
499 const unsigned char *clntcurves, *srvrcurves;
500 size_t clnt_num_curves, srvr_num_curves;
501 int group_nid, found = 0;
502 unsigned int curve_flags;
504 if (s->hit && (s->ext.psk_kex_mode & TLSEXT_KEX_MODE_FLAG_KE_DHE) == 0)
508 if (s->s3->peer_tmp != NULL) {
509 *al = SSL_AD_INTERNAL_ERROR;
510 SSLerr(SSL_F_TLS_PARSE_CTOS_KEY_SHARE, ERR_R_INTERNAL_ERROR);
514 if (!PACKET_as_length_prefixed_2(pkt, &key_share_list)) {
515 *al = SSL_AD_DECODE_ERROR;
516 SSLerr(SSL_F_TLS_PARSE_CTOS_KEY_SHARE, SSL_R_LENGTH_MISMATCH);
520 /* Get our list of supported curves */
521 if (!tls1_get_curvelist(s, 0, &srvrcurves, &srvr_num_curves)) {
522 *al = SSL_AD_INTERNAL_ERROR;
523 SSLerr(SSL_F_TLS_PARSE_CTOS_KEY_SHARE, ERR_R_INTERNAL_ERROR);
527 /* Get the clients list of supported curves. */
528 if (!tls1_get_curvelist(s, 1, &clntcurves, &clnt_num_curves)) {
529 *al = SSL_AD_INTERNAL_ERROR;
530 SSLerr(SSL_F_TLS_PARSE_CTOS_KEY_SHARE, ERR_R_INTERNAL_ERROR);
533 if (clnt_num_curves == 0) {
535 * This can only happen if the supported_groups extension was not sent,
536 * because we verify that the length is non-zero when we process that
539 *al = SSL_AD_MISSING_EXTENSION;
540 SSLerr(SSL_F_TLS_PARSE_CTOS_KEY_SHARE,
541 SSL_R_MISSING_SUPPORTED_GROUPS_EXTENSION);
545 while (PACKET_remaining(&key_share_list) > 0) {
546 if (!PACKET_get_net_2(&key_share_list, &group_id)
547 || !PACKET_get_length_prefixed_2(&key_share_list, &encoded_pt)
548 || PACKET_remaining(&encoded_pt) == 0) {
549 *al = SSL_AD_DECODE_ERROR;
550 SSLerr(SSL_F_TLS_PARSE_CTOS_KEY_SHARE,
551 SSL_R_LENGTH_MISMATCH);
556 * If we already found a suitable key_share we loop through the
557 * rest to verify the structure, but don't process them.
562 /* Check if this share is in supported_groups sent from client */
563 if (!check_in_list(s, group_id, clntcurves, clnt_num_curves, 0)) {
564 *al = SSL_AD_ILLEGAL_PARAMETER;
565 SSLerr(SSL_F_TLS_PARSE_CTOS_KEY_SHARE, SSL_R_BAD_KEY_SHARE);
569 /* Check if this share is for a group we can use */
570 if (!check_in_list(s, group_id, srvrcurves, srvr_num_curves, 1)) {
571 /* Share not suitable */
575 group_nid = tls1_ec_curve_id2nid(group_id, &curve_flags);
577 if (group_nid == 0) {
578 *al = SSL_AD_INTERNAL_ERROR;
579 SSLerr(SSL_F_TLS_PARSE_CTOS_KEY_SHARE,
580 SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS);
584 if ((curve_flags & TLS_CURVE_TYPE) == TLS_CURVE_CUSTOM) {
585 /* Can happen for some curves, e.g. X25519 */
586 EVP_PKEY *key = EVP_PKEY_new();
588 if (key == NULL || !EVP_PKEY_set_type(key, group_nid)) {
589 *al = SSL_AD_INTERNAL_ERROR;
590 SSLerr(SSL_F_TLS_PARSE_CTOS_KEY_SHARE, ERR_R_EVP_LIB);
594 s->s3->peer_tmp = key;
596 /* Set up EVP_PKEY with named curve as parameters */
597 EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new_id(EVP_PKEY_EC, NULL);
600 || EVP_PKEY_paramgen_init(pctx) <= 0
601 || EVP_PKEY_CTX_set_ec_paramgen_curve_nid(pctx,
603 || EVP_PKEY_paramgen(pctx, &s->s3->peer_tmp) <= 0) {
604 *al = SSL_AD_INTERNAL_ERROR;
605 SSLerr(SSL_F_TLS_PARSE_CTOS_KEY_SHARE, ERR_R_EVP_LIB);
606 EVP_PKEY_CTX_free(pctx);
609 EVP_PKEY_CTX_free(pctx);
612 s->s3->group_id = group_id;
614 if (!EVP_PKEY_set1_tls_encodedpoint(s->s3->peer_tmp,
615 PACKET_data(&encoded_pt),
616 PACKET_remaining(&encoded_pt))) {
617 *al = SSL_AD_ILLEGAL_PARAMETER;
618 SSLerr(SSL_F_TLS_PARSE_CTOS_KEY_SHARE, SSL_R_BAD_ECPOINT);
629 #ifndef OPENSSL_NO_EC
630 int tls_parse_ctos_supported_groups(SSL *s, PACKET *pkt, unsigned int context,
631 X509 *x, size_t chainidx, int *al)
633 PACKET supported_groups_list;
635 /* Each group is 2 bytes and we must have at least 1. */
636 if (!PACKET_as_length_prefixed_2(pkt, &supported_groups_list)
637 || PACKET_remaining(&supported_groups_list) == 0
638 || (PACKET_remaining(&supported_groups_list) % 2) != 0) {
639 *al = SSL_AD_DECODE_ERROR;
643 OPENSSL_free(s->session->ext.supportedgroups);
644 s->session->ext.supportedgroups = NULL;
645 s->session->ext.supportedgroups_len = 0;
646 if (!PACKET_memdup(&supported_groups_list,
647 &s->session->ext.supportedgroups,
648 &s->session->ext.supportedgroups_len)) {
649 *al = SSL_AD_INTERNAL_ERROR;
657 int tls_parse_ctos_ems(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
658 size_t chainidx, int *al)
660 /* The extension must always be empty */
661 if (PACKET_remaining(pkt) != 0) {
662 *al = SSL_AD_DECODE_ERROR;
666 s->s3->flags |= TLS1_FLAGS_RECEIVED_EXTMS;
672 int tls_parse_ctos_early_data(SSL *s, PACKET *pkt, unsigned int context,
673 X509 *x, size_t chainidx, int *al)
675 if (PACKET_remaining(pkt) != 0) {
676 *al = SSL_AD_DECODE_ERROR;
683 int tls_parse_ctos_psk(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
684 size_t chainidx, int *al)
686 PACKET identities, binders, binder;
687 size_t binderoffset, hashsize;
688 SSL_SESSION *sess = NULL;
689 unsigned int id, i, ext = 0;
690 const EVP_MD *md = NULL;
693 * If we have no PSK kex mode that we recognise then we can't resume so
694 * ignore this extension
696 if ((s->ext.psk_kex_mode
697 & (TLSEXT_KEX_MODE_FLAG_KE | TLSEXT_KEX_MODE_FLAG_KE_DHE)) == 0)
700 if (!PACKET_get_length_prefixed_2(pkt, &identities)) {
701 *al = SSL_AD_DECODE_ERROR;
705 for (id = 0; PACKET_remaining(&identities) != 0; id++) {
707 unsigned long ticket_agel;
709 if (!PACKET_get_length_prefixed_2(&identities, &identity)
710 || !PACKET_get_net_4(&identities, &ticket_agel)) {
711 *al = SSL_AD_DECODE_ERROR;
715 if (s->psk_find_session_cb != NULL
716 && s->psk_find_session_cb(s, PACKET_data(&identity),
717 PACKET_remaining(&identity), &sess)) {
718 SSL_SESSION *sesstmp = ssl_session_dup(sess, 0);
720 if (sesstmp == NULL) {
721 *al = SSL_AD_INTERNAL_ERROR;
724 SSL_SESSION_free(sess);
728 * We've just been told to use this session for this context so
729 * make sure the sid_ctx matches up.
731 memcpy(sess->sid_ctx, s->sid_ctx, s->sid_ctx_length);
732 sess->sid_ctx_length = s->sid_ctx_length;
735 uint32_t ticket_age = 0, now, agesec, agems;
736 int ret = tls_decrypt_ticket(s, PACKET_data(&identity),
737 PACKET_remaining(&identity), NULL, 0,
740 if (ret == TICKET_FATAL_ERR_MALLOC
741 || ret == TICKET_FATAL_ERR_OTHER) {
742 *al = SSL_AD_INTERNAL_ERROR;
745 if (ret == TICKET_NO_DECRYPT)
748 ticket_age = (uint32_t)ticket_agel;
749 now = (uint32_t)time(NULL);
750 agesec = now - (uint32_t)sess->time;
751 agems = agesec * (uint32_t)1000;
752 ticket_age -= sess->ext.tick_age_add;
755 * For simplicity we do our age calculations in seconds. If the
756 * client does it in ms then it could appear that their ticket age
757 * is longer than ours (our ticket age calculation should always be
758 * slightly longer than the client's due to the network latency).
759 * Therefore we add 1000ms to our age calculation to adjust for
762 if (sess->timeout >= (long)agesec
763 && agems / (uint32_t)1000 == agesec
764 && ticket_age <= agems + 1000
765 && ticket_age + TICKET_AGE_ALLOWANCE >= agems + 1000) {
767 * Ticket age is within tolerance and not expired. We allow it
770 s->ext.early_data_ok = 1;
774 md = ssl_md(sess->cipher->algorithm2);
775 if (md != ssl_md(s->s3->tmp.new_cipher->algorithm2)) {
776 /* The ciphersuite is not compatible with this session. */
777 SSL_SESSION_free(sess);
787 binderoffset = PACKET_data(pkt) - (const unsigned char *)s->init_buf->data;
788 hashsize = EVP_MD_size(md);
790 if (!PACKET_get_length_prefixed_2(pkt, &binders)) {
791 *al = SSL_AD_DECODE_ERROR;
795 for (i = 0; i <= id; i++) {
796 if (!PACKET_get_length_prefixed_1(&binders, &binder)) {
797 *al = SSL_AD_DECODE_ERROR;
802 if (PACKET_remaining(&binder) != hashsize
803 || tls_psk_do_binder(s, md,
804 (const unsigned char *)s->init_buf->data,
805 binderoffset, PACKET_data(&binder), NULL,
806 sess, 0, ext) != 1) {
807 *al = SSL_AD_DECODE_ERROR;
808 SSLerr(SSL_F_TLS_PARSE_CTOS_PSK, ERR_R_INTERNAL_ERROR);
812 sess->ext.tick_identity = id;
814 SSL_SESSION_free(s->session);
818 SSL_SESSION_free(sess);
823 * Add the server's renegotiation binding
825 EXT_RETURN tls_construct_stoc_renegotiate(SSL *s, WPACKET *pkt,
826 unsigned int context, X509 *x,
827 size_t chainidx, int *al)
829 if (!s->s3->send_connection_binding)
830 return EXT_RETURN_NOT_SENT;
832 /* Still add this even if SSL_OP_NO_RENEGOTIATION is set */
833 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_renegotiate)
834 || !WPACKET_start_sub_packet_u16(pkt)
835 || !WPACKET_start_sub_packet_u8(pkt)
836 || !WPACKET_memcpy(pkt, s->s3->previous_client_finished,
837 s->s3->previous_client_finished_len)
838 || !WPACKET_memcpy(pkt, s->s3->previous_server_finished,
839 s->s3->previous_server_finished_len)
840 || !WPACKET_close(pkt)
841 || !WPACKET_close(pkt)) {
842 SSLerr(SSL_F_TLS_CONSTRUCT_STOC_RENEGOTIATE, ERR_R_INTERNAL_ERROR);
843 return EXT_RETURN_FAIL;
846 return EXT_RETURN_SENT;
849 EXT_RETURN tls_construct_stoc_server_name(SSL *s, WPACKET *pkt,
850 unsigned int context, X509 *x,
851 size_t chainidx, int *al)
853 if (s->hit || s->servername_done != 1
854 || s->session->ext.hostname == NULL)
855 return EXT_RETURN_NOT_SENT;
857 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_server_name)
858 || !WPACKET_put_bytes_u16(pkt, 0)) {
859 SSLerr(SSL_F_TLS_CONSTRUCT_STOC_SERVER_NAME, ERR_R_INTERNAL_ERROR);
860 return EXT_RETURN_FAIL;
863 return EXT_RETURN_SENT;
866 #ifndef OPENSSL_NO_EC
867 EXT_RETURN tls_construct_stoc_ec_pt_formats(SSL *s, WPACKET *pkt,
868 unsigned int context, X509 *x,
869 size_t chainidx, int *al)
871 unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
872 unsigned long alg_a = s->s3->tmp.new_cipher->algorithm_auth;
873 int using_ecc = ((alg_k & SSL_kECDHE) || (alg_a & SSL_aECDSA))
874 && (s->session->ext.ecpointformats != NULL);
875 const unsigned char *plist;
879 return EXT_RETURN_NOT_SENT;
881 tls1_get_formatlist(s, &plist, &plistlen);
882 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_ec_point_formats)
883 || !WPACKET_start_sub_packet_u16(pkt)
884 || !WPACKET_sub_memcpy_u8(pkt, plist, plistlen)
885 || !WPACKET_close(pkt)) {
886 SSLerr(SSL_F_TLS_CONSTRUCT_STOC_EC_PT_FORMATS, ERR_R_INTERNAL_ERROR);
887 return EXT_RETURN_FAIL;
890 return EXT_RETURN_SENT;
894 #ifndef OPENSSL_NO_EC
895 EXT_RETURN tls_construct_stoc_supported_groups(SSL *s, WPACKET *pkt,
896 unsigned int context, X509 *x,
897 size_t chainidx, int *al)
899 const unsigned char *groups;
900 size_t numgroups, i, first = 1;
902 /* s->s3->group_id is non zero if we accepted a key_share */
903 if (s->s3->group_id == 0)
904 return EXT_RETURN_NOT_SENT;
906 /* Get our list of supported groups */
907 if (!tls1_get_curvelist(s, 0, &groups, &numgroups) || numgroups == 0) {
908 SSLerr(SSL_F_TLS_CONSTRUCT_STOC_SUPPORTED_GROUPS, ERR_R_INTERNAL_ERROR);
909 return EXT_RETURN_FAIL;
912 /* Copy group ID if supported */
913 for (i = 0; i < numgroups; i++, groups += 2) {
914 if (tls_curve_allowed(s, groups, SSL_SECOP_CURVE_SUPPORTED)) {
917 * Check if the client is already using our preferred group. If
918 * so we don't need to add this extension
920 if (s->s3->group_id == GET_GROUP_ID(groups, 0))
921 return EXT_RETURN_NOT_SENT;
923 /* Add extension header */
924 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_supported_groups)
925 /* Sub-packet for supported_groups extension */
926 || !WPACKET_start_sub_packet_u16(pkt)
927 || !WPACKET_start_sub_packet_u16(pkt)) {
928 SSLerr(SSL_F_TLS_CONSTRUCT_STOC_SUPPORTED_GROUPS,
929 ERR_R_INTERNAL_ERROR);
930 return EXT_RETURN_FAIL;
935 if (!WPACKET_put_bytes_u16(pkt, GET_GROUP_ID(groups, 0))) {
936 SSLerr(SSL_F_TLS_CONSTRUCT_STOC_SUPPORTED_GROUPS,
937 ERR_R_INTERNAL_ERROR);
938 return EXT_RETURN_FAIL;
943 if (!WPACKET_close(pkt) || !WPACKET_close(pkt)) {
944 SSLerr(SSL_F_TLS_CONSTRUCT_STOC_SUPPORTED_GROUPS, ERR_R_INTERNAL_ERROR);
945 return EXT_RETURN_FAIL;
948 return EXT_RETURN_SENT;
952 EXT_RETURN tls_construct_stoc_session_ticket(SSL *s, WPACKET *pkt,
953 unsigned int context, X509 *x,
954 size_t chainidx, int *al)
956 if (!s->ext.ticket_expected || !tls_use_ticket(s)) {
957 s->ext.ticket_expected = 0;
958 return EXT_RETURN_NOT_SENT;
961 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_session_ticket)
962 || !WPACKET_put_bytes_u16(pkt, 0)) {
963 SSLerr(SSL_F_TLS_CONSTRUCT_STOC_SESSION_TICKET, ERR_R_INTERNAL_ERROR);
964 return EXT_RETURN_FAIL;
967 return EXT_RETURN_SENT;
970 #ifndef OPENSSL_NO_OCSP
971 EXT_RETURN tls_construct_stoc_status_request(SSL *s, WPACKET *pkt,
972 unsigned int context, X509 *x,
973 size_t chainidx, int *al)
975 if (!s->ext.status_expected)
976 return EXT_RETURN_NOT_SENT;
978 if (SSL_IS_TLS13(s) && chainidx != 0)
979 return EXT_RETURN_NOT_SENT;
981 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_status_request)
982 || !WPACKET_start_sub_packet_u16(pkt)) {
983 SSLerr(SSL_F_TLS_CONSTRUCT_STOC_STATUS_REQUEST, ERR_R_INTERNAL_ERROR);
984 return EXT_RETURN_FAIL;
988 * In TLSv1.3 we include the certificate status itself. In <= TLSv1.2 we
989 * send back an empty extension, with the certificate status appearing as a
992 if ((SSL_IS_TLS13(s) && !tls_construct_cert_status_body(s, pkt))
993 || !WPACKET_close(pkt)) {
994 SSLerr(SSL_F_TLS_CONSTRUCT_STOC_STATUS_REQUEST, ERR_R_INTERNAL_ERROR);
995 return EXT_RETURN_FAIL;
998 return EXT_RETURN_SENT;
1002 #ifndef OPENSSL_NO_NEXTPROTONEG
1003 EXT_RETURN tls_construct_stoc_next_proto_neg(SSL *s, WPACKET *pkt,
1004 unsigned int context, X509 *x,
1005 size_t chainidx, int *al)
1007 const unsigned char *npa;
1008 unsigned int npalen;
1010 int npn_seen = s->s3->npn_seen;
1012 s->s3->npn_seen = 0;
1013 if (!npn_seen || s->ctx->ext.npn_advertised_cb == NULL)
1014 return EXT_RETURN_NOT_SENT;
1016 ret = s->ctx->ext.npn_advertised_cb(s, &npa, &npalen,
1017 s->ctx->ext.npn_advertised_cb_arg);
1018 if (ret == SSL_TLSEXT_ERR_OK) {
1019 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_next_proto_neg)
1020 || !WPACKET_sub_memcpy_u16(pkt, npa, npalen)) {
1021 SSLerr(SSL_F_TLS_CONSTRUCT_STOC_NEXT_PROTO_NEG,
1022 ERR_R_INTERNAL_ERROR);
1023 return EXT_RETURN_FAIL;
1025 s->s3->npn_seen = 1;
1028 return EXT_RETURN_SENT;
1032 EXT_RETURN tls_construct_stoc_alpn(SSL *s, WPACKET *pkt, unsigned int context,
1033 X509 *x, size_t chainidx, int *al)
1035 if (s->s3->alpn_selected == NULL)
1036 return EXT_RETURN_NOT_SENT;
1038 if (!WPACKET_put_bytes_u16(pkt,
1039 TLSEXT_TYPE_application_layer_protocol_negotiation)
1040 || !WPACKET_start_sub_packet_u16(pkt)
1041 || !WPACKET_start_sub_packet_u16(pkt)
1042 || !WPACKET_sub_memcpy_u8(pkt, s->s3->alpn_selected,
1043 s->s3->alpn_selected_len)
1044 || !WPACKET_close(pkt)
1045 || !WPACKET_close(pkt)) {
1046 SSLerr(SSL_F_TLS_CONSTRUCT_STOC_ALPN, ERR_R_INTERNAL_ERROR);
1047 return EXT_RETURN_FAIL;
1050 return EXT_RETURN_SENT;
1053 #ifndef OPENSSL_NO_SRTP
1054 EXT_RETURN tls_construct_stoc_use_srtp(SSL *s, WPACKET *pkt,
1055 unsigned int context, X509 *x,
1056 size_t chainidx, int *al)
1058 if (s->srtp_profile == NULL)
1059 return EXT_RETURN_NOT_SENT;
1061 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_use_srtp)
1062 || !WPACKET_start_sub_packet_u16(pkt)
1063 || !WPACKET_put_bytes_u16(pkt, 2)
1064 || !WPACKET_put_bytes_u16(pkt, s->srtp_profile->id)
1065 || !WPACKET_put_bytes_u8(pkt, 0)
1066 || !WPACKET_close(pkt)) {
1067 SSLerr(SSL_F_TLS_CONSTRUCT_STOC_USE_SRTP, ERR_R_INTERNAL_ERROR);
1068 return EXT_RETURN_FAIL;
1071 return EXT_RETURN_SENT;
1075 EXT_RETURN tls_construct_stoc_etm(SSL *s, WPACKET *pkt, unsigned int context,
1076 X509 *x, size_t chainidx, int *al)
1078 if (!s->ext.use_etm)
1079 return EXT_RETURN_NOT_SENT;
1082 * Don't use encrypt_then_mac if AEAD or RC4 might want to disable
1083 * for other cases too.
1085 if (s->s3->tmp.new_cipher->algorithm_mac == SSL_AEAD
1086 || s->s3->tmp.new_cipher->algorithm_enc == SSL_RC4
1087 || s->s3->tmp.new_cipher->algorithm_enc == SSL_eGOST2814789CNT
1088 || s->s3->tmp.new_cipher->algorithm_enc == SSL_eGOST2814789CNT12) {
1090 return EXT_RETURN_NOT_SENT;
1093 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_encrypt_then_mac)
1094 || !WPACKET_put_bytes_u16(pkt, 0)) {
1095 SSLerr(SSL_F_TLS_CONSTRUCT_STOC_ETM, ERR_R_INTERNAL_ERROR);
1096 return EXT_RETURN_FAIL;
1099 return EXT_RETURN_SENT;
1102 EXT_RETURN tls_construct_stoc_ems(SSL *s, WPACKET *pkt, unsigned int context,
1103 X509 *x, size_t chainidx, int *al)
1105 if ((s->s3->flags & TLS1_FLAGS_RECEIVED_EXTMS) == 0)
1106 return EXT_RETURN_NOT_SENT;
1108 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_extended_master_secret)
1109 || !WPACKET_put_bytes_u16(pkt, 0)) {
1110 SSLerr(SSL_F_TLS_CONSTRUCT_STOC_EMS, ERR_R_INTERNAL_ERROR);
1111 return EXT_RETURN_FAIL;
1114 return EXT_RETURN_SENT;
1117 EXT_RETURN tls_construct_stoc_key_share(SSL *s, WPACKET *pkt,
1118 unsigned int context, X509 *x,
1119 size_t chainidx, int *al)
1121 #ifndef OPENSSL_NO_TLS1_3
1122 unsigned char *encodedPoint;
1123 size_t encoded_pt_len = 0;
1124 EVP_PKEY *ckey = s->s3->peer_tmp, *skey = NULL;
1127 /* No key_share received from client */
1128 if (s->hello_retry_request) {
1129 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_key_share)
1130 || !WPACKET_start_sub_packet_u16(pkt)
1131 || !WPACKET_put_bytes_u16(pkt, s->s3->group_id)
1132 || !WPACKET_close(pkt)) {
1133 SSLerr(SSL_F_TLS_CONSTRUCT_STOC_KEY_SHARE,
1134 ERR_R_INTERNAL_ERROR);
1135 return EXT_RETURN_FAIL;
1138 return EXT_RETURN_SENT;
1141 /* Must be resuming. */
1142 if (!s->hit || !tls13_generate_handshake_secret(s, NULL, 0)) {
1143 *al = SSL_AD_INTERNAL_ERROR;
1144 SSLerr(SSL_F_TLS_CONSTRUCT_STOC_KEY_SHARE, ERR_R_INTERNAL_ERROR);
1145 return EXT_RETURN_FAIL;
1147 return EXT_RETURN_NOT_SENT;
1150 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_key_share)
1151 || !WPACKET_start_sub_packet_u16(pkt)
1152 || !WPACKET_put_bytes_u16(pkt, s->s3->group_id)) {
1153 SSLerr(SSL_F_TLS_CONSTRUCT_STOC_KEY_SHARE, ERR_R_INTERNAL_ERROR);
1154 return EXT_RETURN_FAIL;
1157 skey = ssl_generate_pkey(ckey);
1159 SSLerr(SSL_F_TLS_CONSTRUCT_STOC_KEY_SHARE, ERR_R_MALLOC_FAILURE);
1160 return EXT_RETURN_FAIL;
1163 /* Generate encoding of server key */
1164 encoded_pt_len = EVP_PKEY_get1_tls_encodedpoint(skey, &encodedPoint);
1165 if (encoded_pt_len == 0) {
1166 SSLerr(SSL_F_TLS_CONSTRUCT_STOC_KEY_SHARE, ERR_R_EC_LIB);
1167 EVP_PKEY_free(skey);
1168 return EXT_RETURN_FAIL;
1171 if (!WPACKET_sub_memcpy_u16(pkt, encodedPoint, encoded_pt_len)
1172 || !WPACKET_close(pkt)) {
1173 SSLerr(SSL_F_TLS_CONSTRUCT_STOC_KEY_SHARE, ERR_R_INTERNAL_ERROR);
1174 EVP_PKEY_free(skey);
1175 OPENSSL_free(encodedPoint);
1176 return EXT_RETURN_FAIL;
1178 OPENSSL_free(encodedPoint);
1180 /* This causes the crypto state to be updated based on the derived keys */
1181 s->s3->tmp.pkey = skey;
1182 if (ssl_derive(s, skey, ckey, 1) == 0) {
1183 SSLerr(SSL_F_TLS_CONSTRUCT_STOC_KEY_SHARE, ERR_R_INTERNAL_ERROR);
1184 return EXT_RETURN_FAIL;
1188 return EXT_RETURN_SENT;
1191 EXT_RETURN tls_construct_stoc_cryptopro_bug(SSL *s, WPACKET *pkt,
1192 unsigned int context, X509 *x,
1193 size_t chainidx, int *al)
1195 const unsigned char cryptopro_ext[36] = {
1196 0xfd, 0xe8, /* 65000 */
1197 0x00, 0x20, /* 32 bytes length */
1198 0x30, 0x1e, 0x30, 0x08, 0x06, 0x06, 0x2a, 0x85,
1199 0x03, 0x02, 0x02, 0x09, 0x30, 0x08, 0x06, 0x06,
1200 0x2a, 0x85, 0x03, 0x02, 0x02, 0x16, 0x30, 0x08,
1201 0x06, 0x06, 0x2a, 0x85, 0x03, 0x02, 0x02, 0x17
1204 if (((s->s3->tmp.new_cipher->id & 0xFFFF) != 0x80
1205 && (s->s3->tmp.new_cipher->id & 0xFFFF) != 0x81)
1206 || (SSL_get_options(s) & SSL_OP_CRYPTOPRO_TLSEXT_BUG) == 0)
1207 return EXT_RETURN_NOT_SENT;
1209 if (!WPACKET_memcpy(pkt, cryptopro_ext, sizeof(cryptopro_ext))) {
1210 SSLerr(SSL_F_TLS_CONSTRUCT_STOC_CRYPTOPRO_BUG, ERR_R_INTERNAL_ERROR);
1211 return EXT_RETURN_FAIL;
1214 return EXT_RETURN_SENT;
1217 EXT_RETURN tls_construct_stoc_early_data(SSL *s, WPACKET *pkt,
1218 unsigned int context, X509 *x,
1219 size_t chainidx, int *al)
1221 if (context == SSL_EXT_TLS1_3_NEW_SESSION_TICKET) {
1222 if (s->max_early_data == 0)
1223 return EXT_RETURN_NOT_SENT;
1225 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_early_data)
1226 || !WPACKET_start_sub_packet_u16(pkt)
1227 || !WPACKET_put_bytes_u32(pkt, s->max_early_data)
1228 || !WPACKET_close(pkt)) {
1229 SSLerr(SSL_F_TLS_CONSTRUCT_STOC_EARLY_DATA, ERR_R_INTERNAL_ERROR);
1230 return EXT_RETURN_FAIL;
1233 return EXT_RETURN_SENT;
1236 if (s->ext.early_data != SSL_EARLY_DATA_ACCEPTED)
1237 return EXT_RETURN_NOT_SENT;
1239 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_early_data)
1240 || !WPACKET_start_sub_packet_u16(pkt)
1241 || !WPACKET_close(pkt)) {
1242 SSLerr(SSL_F_TLS_CONSTRUCT_STOC_EARLY_DATA, ERR_R_INTERNAL_ERROR);
1243 return EXT_RETURN_FAIL;
1246 return EXT_RETURN_SENT;
1249 EXT_RETURN tls_construct_stoc_psk(SSL *s, WPACKET *pkt, unsigned int context,
1250 X509 *x, size_t chainidx, int *al)
1253 return EXT_RETURN_NOT_SENT;
1255 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_psk)
1256 || !WPACKET_start_sub_packet_u16(pkt)
1257 || !WPACKET_put_bytes_u16(pkt, s->session->ext.tick_identity)
1258 || !WPACKET_close(pkt)) {
1259 SSLerr(SSL_F_TLS_CONSTRUCT_STOC_PSK, ERR_R_INTERNAL_ERROR);
1260 return EXT_RETURN_FAIL;
1263 return EXT_RETURN_SENT;