2 * Copyright 2016 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_client_renegotiate(SSL *s, PACKET *pkt, int *al)
20 const unsigned char *data;
22 /* Parse the length byte */
23 if (!PACKET_get_1(pkt, &ilen)
24 || !PACKET_get_bytes(pkt, &data, ilen)) {
25 SSLerr(SSL_F_TLS_PARSE_CLIENT_RENEGOTIATE,
26 SSL_R_RENEGOTIATION_ENCODING_ERR);
27 *al = SSL_AD_ILLEGAL_PARAMETER;
31 /* Check that the extension matches */
32 if (ilen != s->s3->previous_client_finished_len) {
33 SSLerr(SSL_F_TLS_PARSE_CLIENT_RENEGOTIATE,
34 SSL_R_RENEGOTIATION_MISMATCH);
35 *al = SSL_AD_HANDSHAKE_FAILURE;
39 if (memcmp(data, s->s3->previous_client_finished,
40 s->s3->previous_client_finished_len)) {
41 SSLerr(SSL_F_TLS_PARSE_CLIENT_RENEGOTIATE,
42 SSL_R_RENEGOTIATION_MISMATCH);
43 *al = SSL_AD_HANDSHAKE_FAILURE;
47 s->s3->send_connection_binding = 1;
52 int tls_parse_client_server_name(SSL *s, PACKET *pkt, int *al)
54 unsigned int servname_type;
58 * The servername extension is treated as follows:
60 * - Only the hostname type is supported with a maximum length of 255.
61 * - The servername is rejected if too long or if it contains zeros,
62 * in which case an fatal alert is generated.
63 * - The servername field is maintained together with the session cache.
64 * - When a session is resumed, the servername call back invoked in order
65 * to allow the application to position itself to the right context.
66 * - The servername is acknowledged if it is new for a session or when
67 * it is identical to a previously used for the same session.
68 * Applications can control the behaviour. They can at any time
69 * set a 'desirable' servername for a new SSL object. This can be the
70 * case for example with HTTPS when a Host: header field is received and
71 * a renegotiation is requested. In this case, a possible servername
72 * presented in the new client hello is only acknowledged if it matches
73 * the value of the Host: field.
74 * - Applications must use SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION
75 * if they provide for changing an explicit servername context for the
76 * session, i.e. when the session has been established with a servername
78 * - On session reconnect, the servername extension may be absent.
81 if (!PACKET_as_length_prefixed_2(pkt, &sni)
82 /* ServerNameList must be at least 1 byte long. */
83 || PACKET_remaining(&sni) == 0) {
84 *al = SSL_AD_DECODE_ERROR;
89 * Although the server_name extension was intended to be
90 * extensible to new name types, RFC 4366 defined the
91 * syntax inextensibility and OpenSSL 1.0.x parses it as
93 * RFC 6066 corrected the mistake but adding new name types
94 * is nevertheless no longer feasible, so act as if no other
95 * SNI types can exist, to simplify parsing.
97 * Also note that the RFC permits only one SNI value per type,
98 * i.e., we can only have a single hostname.
100 if (!PACKET_get_1(&sni, &servname_type)
101 || servname_type != TLSEXT_NAMETYPE_host_name
102 || !PACKET_as_length_prefixed_2(&sni, &hostname)) {
103 *al = SSL_AD_DECODE_ERROR;
108 if (PACKET_remaining(&hostname) > TLSEXT_MAXLEN_host_name) {
109 *al = TLS1_AD_UNRECOGNIZED_NAME;
113 if (PACKET_contains_zero_byte(&hostname)) {
114 *al = TLS1_AD_UNRECOGNIZED_NAME;
118 if (!PACKET_strndup(&hostname, &s->session->tlsext_hostname)) {
119 *al = TLS1_AD_INTERNAL_ERROR;
123 s->servername_done = 1;
126 * TODO(openssl-team): if the SNI doesn't match, we MUST
127 * fall back to a full handshake.
129 s->servername_done = s->session->tlsext_hostname
130 && PACKET_equal(&hostname, s->session->tlsext_hostname,
131 strlen(s->session->tlsext_hostname));
137 #ifndef OPENSSL_NO_SRP
138 int tls_parse_client_srp(SSL *s, PACKET *pkt, int *al)
142 if (!PACKET_as_length_prefixed_1(pkt, &srp_I)
143 || PACKET_contains_zero_byte(&srp_I)) {
144 *al = SSL_AD_DECODE_ERROR;
149 * TODO(openssl-team): currently, we re-authenticate the user
150 * upon resumption. Instead, we MUST ignore the login.
152 if (!PACKET_strndup(&srp_I, &s->srp_ctx.login)) {
153 *al = TLS1_AD_INTERNAL_ERROR;
161 #ifndef OPENSSL_NO_EC
162 int tls_parse_client_ec_pt_formats(SSL *s, PACKET *pkt, int *al)
164 PACKET ec_point_format_list;
166 if (!PACKET_as_length_prefixed_1(pkt, &ec_point_format_list)
167 || PACKET_remaining(&ec_point_format_list) == 0) {
168 *al = SSL_AD_DECODE_ERROR;
173 if (!PACKET_memdup(&ec_point_format_list,
174 &s->session->tlsext_ecpointformatlist,
175 &s->session->tlsext_ecpointformatlist_length)) {
176 *al = TLS1_AD_INTERNAL_ERROR;
183 #endif /* OPENSSL_NO_EC */
185 int tls_parse_client_session_ticket(SSL *s, PACKET *pkt, int *al)
187 if (s->tls_session_ticket_ext_cb &&
188 !s->tls_session_ticket_ext_cb(s, PACKET_data(pkt),
189 PACKET_remaining(pkt),
190 s->tls_session_ticket_ext_cb_arg)) {
191 *al = TLS1_AD_INTERNAL_ERROR;
198 int tls_parse_client_sig_algs(SSL *s, PACKET *pkt, int *al)
200 PACKET supported_sig_algs;
202 if (!PACKET_as_length_prefixed_2(pkt, &supported_sig_algs)
203 || (PACKET_remaining(&supported_sig_algs) % 2) != 0
204 || PACKET_remaining(&supported_sig_algs) == 0) {
205 *al = SSL_AD_DECODE_ERROR;
209 if (!s->hit && !tls1_save_sigalgs(s, PACKET_data(&supported_sig_algs),
210 PACKET_remaining(&supported_sig_algs))) {
211 *al = TLS1_AD_INTERNAL_ERROR;
218 #ifndef OPENSSL_NO_OCSP
219 int tls_parse_client_status_request(SSL *s, PACKET *pkt, int *al)
221 if (!PACKET_get_1(pkt, (unsigned int *)&s->tlsext_status_type)) {
222 *al = SSL_AD_DECODE_ERROR;
226 if (s->tlsext_status_type == TLSEXT_STATUSTYPE_ocsp) {
227 const unsigned char *ext_data;
228 PACKET responder_id_list, exts;
229 if (!PACKET_get_length_prefixed_2 (pkt, &responder_id_list)) {
230 *al = SSL_AD_DECODE_ERROR;
235 * We remove any OCSP_RESPIDs from a previous handshake
236 * to prevent unbounded memory growth - CVE-2016-6304
238 sk_OCSP_RESPID_pop_free(s->tlsext_ocsp_ids, OCSP_RESPID_free);
239 if (PACKET_remaining(&responder_id_list) > 0) {
240 s->tlsext_ocsp_ids = sk_OCSP_RESPID_new_null();
241 if (s->tlsext_ocsp_ids == NULL) {
242 *al = SSL_AD_INTERNAL_ERROR;
246 s->tlsext_ocsp_ids = NULL;
249 while (PACKET_remaining(&responder_id_list) > 0) {
252 const unsigned char *id_data;
254 if (!PACKET_get_length_prefixed_2(&responder_id_list,
256 || PACKET_remaining(&responder_id) == 0) {
257 *al = SSL_AD_DECODE_ERROR;
261 id_data = PACKET_data(&responder_id);
262 /* TODO(size_t): Convert d2i_* to size_t */
263 id = d2i_OCSP_RESPID(NULL, &id_data,
264 (int)PACKET_remaining(&responder_id));
266 *al = SSL_AD_DECODE_ERROR;
270 if (id_data != PACKET_end(&responder_id)) {
271 OCSP_RESPID_free(id);
272 *al = SSL_AD_DECODE_ERROR;
276 if (!sk_OCSP_RESPID_push(s->tlsext_ocsp_ids, id)) {
277 OCSP_RESPID_free(id);
278 *al = SSL_AD_INTERNAL_ERROR;
283 /* Read in request_extensions */
284 if (!PACKET_as_length_prefixed_2(pkt, &exts)) {
285 *al = SSL_AD_DECODE_ERROR;
289 if (PACKET_remaining(&exts) > 0) {
290 ext_data = PACKET_data(&exts);
291 sk_X509_EXTENSION_pop_free(s->tlsext_ocsp_exts,
292 X509_EXTENSION_free);
293 s->tlsext_ocsp_exts =
294 d2i_X509_EXTENSIONS(NULL, &ext_data,
295 (int)PACKET_remaining(&exts));
296 if (s->tlsext_ocsp_exts == NULL || ext_data != PACKET_end(&exts)) {
297 *al = SSL_AD_DECODE_ERROR;
303 * We don't know what to do with any other type so ignore it.
305 s->tlsext_status_type = -1;
312 #ifndef OPENSSL_NO_NEXTPROTONEG
313 int tls_parse_client_npn(SSL *s, PACKET *pkt, int *al)
315 if (s->s3->tmp.finish_md_len == 0) {
317 * We shouldn't accept this extension on a
320 * s->new_session will be set on renegotiation, but we
321 * probably shouldn't rely that it couldn't be set on
322 * the initial renegotiation too in certain cases (when
323 * there's some other reason to disallow resuming an
324 * earlier session -- the current code won't be doing
325 * anything like that, but this might change).
327 * A valid sign that there's been a previous handshake
328 * in this connection is if s->s3->tmp.finish_md_len >
329 * 0. (We are talking about a check that will happen
330 * in the Hello protocol round, well before a new
331 * Finished message could have been computed.)
333 s->s3->next_proto_neg_seen = 1;
341 * Save the ALPN extension in a ClientHello.
342 * pkt: the contents of the ALPN extension, not including type and length.
343 * al: a pointer to the alert value to send in the event of a failure.
344 * returns: 1 on success, 0 on error.
346 int tls_parse_client_alpn(SSL *s, PACKET *pkt, int *al)
348 PACKET protocol_list, save_protocol_list, protocol;
350 if (s->s3->tmp.finish_md_len != 0)
353 if (!PACKET_as_length_prefixed_2(pkt, &protocol_list)
354 || PACKET_remaining(&protocol_list) < 2) {
355 *al = SSL_AD_DECODE_ERROR;
359 save_protocol_list = protocol_list;
361 /* Protocol names can't be empty. */
362 if (!PACKET_get_length_prefixed_1(&protocol_list, &protocol)
363 || PACKET_remaining(&protocol) == 0) {
364 *al = SSL_AD_DECODE_ERROR;
367 } while (PACKET_remaining(&protocol_list) != 0);
369 if (!PACKET_memdup(&save_protocol_list,
370 &s->s3->alpn_proposed, &s->s3->alpn_proposed_len)) {
371 *al = TLS1_AD_INTERNAL_ERROR;
378 #ifndef OPENSSL_NO_SRTP
379 int tls_parse_client_use_srtp(SSL *s, PACKET *pkt, int *al)
381 SRTP_PROTECTION_PROFILE *sprof;
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)
393 || (ct & 1) != 0 || !PACKET_get_sub_packet(pkt, &subpkt, ct)) {
394 SSLerr(SSL_F_TLS_PARSE_CLIENT_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_CLIENT_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 sprof = sk_SRTP_PROTECTION_PROFILE_value(srvr, i);
421 if (sprof->id == id) {
422 s->srtp_profile = sprof;
430 * 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_CLIENT_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_CLIENT_USE_SRTP, SSL_R_BAD_SRTP_MKI_VALUE);
442 *al = SSL_AD_DECODE_ERROR;
450 int tls_parse_client_etm(SSL *s, PACKET *pkt, int *al)
452 if (!(s->options & SSL_OP_NO_ENCRYPT_THEN_MAC))
453 s->s3->flags |= TLS1_FLAGS_ENCRYPT_THEN_MAC;
459 * Checks a list of |groups| to determine if the |group_id| is in it. If it is
460 * and |checkallow| is 1 then additionally check if the group is allowed to be
461 * used. Returns 1 if the group is in the list (and allowed if |checkallow| is
464 static int check_in_list(SSL *s, unsigned int group_id,
465 const unsigned char *groups, size_t num_groups,
470 if (groups == NULL || num_groups == 0)
473 for (i = 0; i < num_groups; i++, groups += 2) {
474 unsigned int share_id = (groups[0] << 8) | (groups[1]);
476 if (group_id == share_id
477 && (!checkallow || tls_curve_allowed(s, groups,
478 SSL_SECOP_CURVE_CHECK))) {
483 /* If i == num_groups then not in the list */
484 return i < num_groups;
488 * Process a key_share extension received in the ClientHello. |pkt| contains
489 * the raw PACKET data for the extension. Returns 1 on success or 0 on failure.
490 * If a failure occurs then |*al| is set to an appropriate alert value.
492 int tls_parse_client_key_share(SSL *s, PACKET *pkt, int *al)
494 unsigned int group_id;
495 PACKET key_share_list, encoded_pt;
496 const unsigned char *clntcurves, *srvrcurves;
497 size_t clnt_num_curves, srvr_num_curves;
498 int group_nid, found = 0;
499 unsigned int curve_flags;
505 if (s->s3->peer_tmp != NULL) {
506 *al = SSL_AD_INTERNAL_ERROR;
507 SSLerr(SSL_F_TLS_PARSE_CLIENT_KEY_SHARE, ERR_R_INTERNAL_ERROR);
511 if (!PACKET_as_length_prefixed_2(pkt, &key_share_list)) {
512 *al = SSL_AD_HANDSHAKE_FAILURE;
513 SSLerr(SSL_F_TLS_PARSE_CLIENT_KEY_SHARE, SSL_R_LENGTH_MISMATCH);
517 /* Get our list of supported curves */
518 if (!tls1_get_curvelist(s, 0, &srvrcurves, &srvr_num_curves)) {
519 *al = SSL_AD_INTERNAL_ERROR;
520 SSLerr(SSL_F_TLS_PARSE_CLIENT_KEY_SHARE, ERR_R_INTERNAL_ERROR);
525 * Get the clients list of supported curves.
526 * TODO(TLS1.3): We should validate that we actually received
529 if (!tls1_get_curvelist(s, 1, &clntcurves, &clnt_num_curves)) {
530 *al = SSL_AD_INTERNAL_ERROR;
531 SSLerr(SSL_F_TLS_PARSE_CLIENT_KEY_SHARE, ERR_R_INTERNAL_ERROR);
535 while (PACKET_remaining(&key_share_list) > 0) {
536 if (!PACKET_get_net_2(&key_share_list, &group_id)
537 || !PACKET_get_length_prefixed_2(&key_share_list, &encoded_pt)
538 || PACKET_remaining(&encoded_pt) == 0) {
539 *al = SSL_AD_HANDSHAKE_FAILURE;
540 SSLerr(SSL_F_TLS_PARSE_CLIENT_KEY_SHARE,
541 SSL_R_LENGTH_MISMATCH);
546 * If we already found a suitable key_share we loop through the
547 * rest to verify the structure, but don't process them.
552 /* Check if this share is in supported_groups sent from client */
553 if (!check_in_list(s, group_id, clntcurves, clnt_num_curves, 0)) {
554 *al = SSL_AD_HANDSHAKE_FAILURE;
555 SSLerr(SSL_F_TLS_PARSE_CLIENT_KEY_SHARE, SSL_R_BAD_KEY_SHARE);
559 /* Check if this share is for a group we can use */
560 if (!check_in_list(s, group_id, srvrcurves, srvr_num_curves, 1)) {
561 /* Share not suitable */
565 group_nid = tls1_ec_curve_id2nid(group_id, &curve_flags);
567 if (group_nid == 0) {
568 *al = SSL_AD_INTERNAL_ERROR;
569 SSLerr(SSL_F_TLS_PARSE_CLIENT_KEY_SHARE,
570 SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS);
574 if ((curve_flags & TLS_CURVE_TYPE) == TLS_CURVE_CUSTOM) {
575 /* Can happen for some curves, e.g. X25519 */
576 EVP_PKEY *key = EVP_PKEY_new();
578 if (key == NULL || !EVP_PKEY_set_type(key, group_nid)) {
579 *al = SSL_AD_INTERNAL_ERROR;
580 SSLerr(SSL_F_TLS_PARSE_CLIENT_KEY_SHARE, ERR_R_EVP_LIB);
584 s->s3->peer_tmp = key;
586 /* Set up EVP_PKEY with named curve as parameters */
587 EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new_id(EVP_PKEY_EC, NULL);
589 || EVP_PKEY_paramgen_init(pctx) <= 0
590 || EVP_PKEY_CTX_set_ec_paramgen_curve_nid(pctx,
592 || EVP_PKEY_paramgen(pctx, &s->s3->peer_tmp) <= 0) {
593 *al = SSL_AD_INTERNAL_ERROR;
594 SSLerr(SSL_F_TLS_PARSE_CLIENT_KEY_SHARE, ERR_R_EVP_LIB);
595 EVP_PKEY_CTX_free(pctx);
598 EVP_PKEY_CTX_free(pctx);
601 s->s3->group_id = group_id;
603 if (!EVP_PKEY_set1_tls_encodedpoint(s->s3->peer_tmp,
604 PACKET_data(&encoded_pt),
605 PACKET_remaining(&encoded_pt))) {
606 *al = SSL_AD_DECODE_ERROR;
607 SSLerr(SSL_F_TLS_PARSE_CLIENT_KEY_SHARE, SSL_R_BAD_ECPOINT);
617 #ifndef OPENSSL_NO_EC
618 int tls_parse_client_supported_groups(SSL *s, PACKET *pkt, int *al)
620 PACKET supported_groups_list;
622 /* Each group is 2 bytes and we must have at least 1. */
623 if (!PACKET_as_length_prefixed_2(pkt, &supported_groups_list)
624 || PACKET_remaining(&supported_groups_list) == 0
625 || (PACKET_remaining(&supported_groups_list) % 2) != 0) {
626 *al = SSL_AD_DECODE_ERROR;
631 && !PACKET_memdup(&supported_groups_list,
632 &s->session->tlsext_supportedgroupslist,
633 &s->session->tlsext_supportedgroupslist_length)) {
634 *al = SSL_AD_DECODE_ERROR;
642 int tls_parse_client_ems(SSL *s, PACKET *pkt, int *al)
644 /* The extension must always be empty */
645 if (PACKET_remaining(pkt) != 0) {
646 *al = SSL_AD_DECODE_ERROR;
650 s->s3->flags |= TLS1_FLAGS_RECEIVED_EXTMS;
655 /* Add the server's renegotiation binding */
656 int tls_construct_server_renegotiate(SSL *s, WPACKET *pkt, int *al)
658 if (!s->s3->send_connection_binding)
661 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_renegotiate)
662 || !WPACKET_start_sub_packet_u16(pkt)
663 || !WPACKET_start_sub_packet_u8(pkt)
664 || !WPACKET_memcpy(pkt, s->s3->previous_client_finished,
665 s->s3->previous_client_finished_len)
666 || !WPACKET_memcpy(pkt, s->s3->previous_server_finished,
667 s->s3->previous_server_finished_len)
668 || !WPACKET_close(pkt)
669 || !WPACKET_close(pkt)) {
670 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_RENEGOTIATE, ERR_R_INTERNAL_ERROR);
677 int tls_construct_server_server_name(SSL *s, WPACKET *pkt, int *al)
679 if (s->hit || s->servername_done != 1
680 || s->session->tlsext_hostname == NULL)
683 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_server_name)
684 || !WPACKET_put_bytes_u16(pkt, 0)) {
685 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_SERVER_NAME, ERR_R_INTERNAL_ERROR);
692 #ifndef OPENSSL_NO_EC
693 int tls_construct_server_ec_pt_formats(SSL *s, WPACKET *pkt, int *al)
695 unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
696 unsigned long alg_a = s->s3->tmp.new_cipher->algorithm_auth;
697 int using_ecc = (alg_k & SSL_kECDHE) || (alg_a & SSL_aECDSA);
698 using_ecc = using_ecc && (s->session->tlsext_ecpointformatlist != NULL);
699 const unsigned char *plist;
705 tls1_get_formatlist(s, &plist, &plistlen);
707 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_ec_point_formats)
708 || !WPACKET_start_sub_packet_u16(pkt)
709 || !WPACKET_sub_memcpy_u8(pkt, plist, plistlen)
710 || !WPACKET_close(pkt)) {
711 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_EC_PT_FORMATS, ERR_R_INTERNAL_ERROR);
719 int tls_construct_server_session_ticket(SSL *s, WPACKET *pkt, int *al)
721 if (!s->tlsext_ticket_expected || !tls_use_ticket(s)) {
722 s->tlsext_ticket_expected = 0;
726 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_session_ticket)
727 || !WPACKET_put_bytes_u16(pkt, 0)) {
728 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_SESSION_TICKET, ERR_R_INTERNAL_ERROR);
735 #ifndef OPENSSL_NO_OCSP
736 int tls_construct_server_status_request(SSL *s, WPACKET *pkt, int *al)
738 if (!s->tlsext_status_expected)
741 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_status_request)
742 || !WPACKET_put_bytes_u16(pkt, 0)) {
743 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_STATUS_REQUEST, ERR_R_INTERNAL_ERROR);
752 #ifndef OPENSSL_NO_NEXTPROTONEG
753 int tls_construct_server_next_proto_neg(SSL *s, WPACKET *pkt, int *al)
755 const unsigned char *npa;
758 int next_proto_neg_seen = s->s3->next_proto_neg_seen;
760 s->s3->next_proto_neg_seen = 0;
761 if (!next_proto_neg_seen || s->ctx->next_protos_advertised_cb == NULL)
764 ret = s->ctx->next_protos_advertised_cb(s, &npa, &npalen,
765 s->ctx->next_protos_advertised_cb_arg);
766 if (ret == SSL_TLSEXT_ERR_OK) {
767 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_next_proto_neg)
768 || !WPACKET_sub_memcpy_u16(pkt, npa, npalen)) {
769 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_NEXT_PROTO_NEG,
770 ERR_R_INTERNAL_ERROR);
773 s->s3->next_proto_neg_seen = 1;
780 int tls_construct_server_alpn(SSL *s, WPACKET *pkt, int *al)
782 if (s->s3->alpn_selected == NULL)
785 if (!WPACKET_put_bytes_u16(pkt,
786 TLSEXT_TYPE_application_layer_protocol_negotiation)
787 || !WPACKET_start_sub_packet_u16(pkt)
788 || !WPACKET_start_sub_packet_u16(pkt)
789 || !WPACKET_sub_memcpy_u8(pkt, s->s3->alpn_selected,
790 s->s3->alpn_selected_len)
791 || !WPACKET_close(pkt)
792 || !WPACKET_close(pkt)) {
793 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_ALPN, ERR_R_INTERNAL_ERROR);
800 #ifndef OPENSSL_NO_SRTP
801 int tls_construct_server_use_srtp(SSL *s, WPACKET *pkt, int *al)
803 if (s->srtp_profile == NULL)
806 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_use_srtp)
807 || !WPACKET_start_sub_packet_u16(pkt)
808 || !WPACKET_put_bytes_u16(pkt, 2)
809 || !WPACKET_put_bytes_u16(pkt, s->srtp_profile->id)
810 || !WPACKET_put_bytes_u8(pkt, 0)
811 || !WPACKET_close(pkt)) {
812 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_USE_SRTP, ERR_R_INTERNAL_ERROR);
820 int tls_construct_server_etm(SSL *s, WPACKET *pkt, int *al)
822 if ((s->s3->flags & TLS1_FLAGS_ENCRYPT_THEN_MAC) == 0)
826 * Don't use encrypt_then_mac if AEAD or RC4 might want to disable
827 * for other cases too.
829 if (s->s3->tmp.new_cipher->algorithm_mac == SSL_AEAD
830 || s->s3->tmp.new_cipher->algorithm_enc == SSL_RC4
831 || s->s3->tmp.new_cipher->algorithm_enc == SSL_eGOST2814789CNT
832 || s->s3->tmp.new_cipher->algorithm_enc == SSL_eGOST2814789CNT12) {
833 s->s3->flags &= ~TLS1_FLAGS_ENCRYPT_THEN_MAC;
837 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_encrypt_then_mac)
838 || !WPACKET_put_bytes_u16(pkt, 0)) {
839 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_ETM, ERR_R_INTERNAL_ERROR);
846 int tls_construct_server_ems(SSL *s, WPACKET *pkt, int *al)
848 if ((s->s3->flags & TLS1_FLAGS_RECEIVED_EXTMS) == 0)
851 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_extended_master_secret)
852 || !WPACKET_put_bytes_u16(pkt, 0)) {
853 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_EMS, ERR_R_INTERNAL_ERROR);
860 int tls_construct_server_key_share(SSL *s, WPACKET *pkt, int *al)
862 unsigned char *encodedPoint;
863 size_t encoded_pt_len = 0;
864 EVP_PKEY *ckey = s->s3->peer_tmp, *skey = NULL;
870 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_SHARE, ERR_R_INTERNAL_ERROR);
874 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_key_share)
875 || !WPACKET_start_sub_packet_u16(pkt)
876 || !WPACKET_put_bytes_u16(pkt, s->s3->group_id)) {
877 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_SHARE, ERR_R_INTERNAL_ERROR);
881 skey = ssl_generate_pkey(ckey);
883 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_SHARE, ERR_R_MALLOC_FAILURE);
887 /* Generate encoding of server key */
888 encoded_pt_len = EVP_PKEY_get1_tls_encodedpoint(skey, &encodedPoint);
889 if (encoded_pt_len == 0) {
890 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_SHARE, ERR_R_EC_LIB);
895 if (!WPACKET_sub_memcpy_u16(pkt, encodedPoint, encoded_pt_len)
896 || !WPACKET_close(pkt)) {
897 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_SHARE, ERR_R_INTERNAL_ERROR);
899 OPENSSL_free(encodedPoint);
902 OPENSSL_free(encodedPoint);
904 /* This causes the crypto state to be updated based on the derived keys */
905 s->s3->tmp.pkey = skey;
906 if (ssl_derive(s, skey, ckey, 1) == 0) {
907 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_SHARE, ERR_R_INTERNAL_ERROR);
914 int tls_construct_server_cryptopro_bug(SSL *s, WPACKET *pkt, int *al)
916 const unsigned char cryptopro_ext[36] = {
917 0xfd, 0xe8, /* 65000 */
918 0x00, 0x20, /* 32 bytes length */
919 0x30, 0x1e, 0x30, 0x08, 0x06, 0x06, 0x2a, 0x85,
920 0x03, 0x02, 0x02, 0x09, 0x30, 0x08, 0x06, 0x06,
921 0x2a, 0x85, 0x03, 0x02, 0x02, 0x16, 0x30, 0x08,
922 0x06, 0x06, 0x2a, 0x85, 0x03, 0x02, 0x02, 0x17
925 if (((s->s3->tmp.new_cipher->id & 0xFFFF) != 0x80
926 && (s->s3->tmp.new_cipher->id & 0xFFFF) != 0x81)
927 || (SSL_get_options(s) & SSL_OP_CRYPTOPRO_TLSEXT_BUG) == 0)
930 if (!WPACKET_memcpy(pkt, cryptopro_ext, sizeof(cryptopro_ext))) {
931 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_CRYPTOPRO_BUG, ERR_R_INTERNAL_ERROR);