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
11 #include <openssl/ocsp.h>
12 #include "../ssl_locl.h"
13 #include "statem_locl.h"
15 int tls_construct_ctos_renegotiate(SSL *s, WPACKET *pkt, int *al)
17 /* Add RI if renegotiating */
21 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_renegotiate)
22 || !WPACKET_start_sub_packet_u16(pkt)
23 || !WPACKET_sub_memcpy_u8(pkt, s->s3->previous_client_finished,
24 s->s3->previous_client_finished_len)
25 || !WPACKET_close(pkt)) {
26 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_RENEGOTIATE, ERR_R_INTERNAL_ERROR);
33 int tls_construct_ctos_server_name(SSL *s, WPACKET *pkt, int *al)
35 if (s->tlsext_hostname == NULL)
38 /* Add TLS extension servername to the Client Hello message */
39 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_server_name)
40 /* Sub-packet for server_name extension */
41 || !WPACKET_start_sub_packet_u16(pkt)
42 /* Sub-packet for servername list (always 1 hostname)*/
43 || !WPACKET_start_sub_packet_u16(pkt)
44 || !WPACKET_put_bytes_u8(pkt, TLSEXT_NAMETYPE_host_name)
45 || !WPACKET_sub_memcpy_u16(pkt, s->tlsext_hostname,
46 strlen(s->tlsext_hostname))
47 || !WPACKET_close(pkt)
48 || !WPACKET_close(pkt)) {
49 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SERVER_NAME, ERR_R_INTERNAL_ERROR);
56 #ifndef OPENSSL_NO_SRP
57 int tls_construct_ctos_srp(SSL *s, WPACKET *pkt, int *al)
59 /* Add SRP username if there is one */
60 if (s->srp_ctx.login == NULL)
63 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_srp)
64 /* Sub-packet for SRP extension */
65 || !WPACKET_start_sub_packet_u16(pkt)
66 || !WPACKET_start_sub_packet_u8(pkt)
67 /* login must not be zero...internal error if so */
68 || !WPACKET_set_flags(pkt, WPACKET_FLAGS_NON_ZERO_LENGTH)
69 || !WPACKET_memcpy(pkt, s->srp_ctx.login,
70 strlen(s->srp_ctx.login))
71 || !WPACKET_close(pkt)
72 || !WPACKET_close(pkt)) {
73 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SRP, ERR_R_INTERNAL_ERROR);
82 static int use_ecc(SSL *s)
85 unsigned long alg_k, alg_a;
86 STACK_OF(SSL_CIPHER) *cipher_stack = NULL;
88 /* See if we support any ECC ciphersuites */
89 if (s->version == SSL3_VERSION)
92 cipher_stack = SSL_get_ciphers(s);
93 end = sk_SSL_CIPHER_num(cipher_stack);
94 for (i = 0; i < end; i++) {
95 const SSL_CIPHER *c = sk_SSL_CIPHER_value(cipher_stack, i);
97 alg_k = c->algorithm_mkey;
98 alg_a = c->algorithm_auth;
99 if ((alg_k & (SSL_kECDHE | SSL_kECDHEPSK))
100 || (alg_a & SSL_aECDSA)
101 || c->min_tls >= TLS1_3_VERSION)
108 int tls_construct_ctos_ec_pt_formats(SSL *s, WPACKET *pkt, int *al)
110 const unsigned char *pformats;
116 /* Add TLS extension ECPointFormats to the ClientHello message */
117 tls1_get_formatlist(s, &pformats, &num_formats);
119 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_ec_point_formats)
120 /* Sub-packet for formats extension */
121 || !WPACKET_start_sub_packet_u16(pkt)
122 || !WPACKET_sub_memcpy_u8(pkt, pformats, num_formats)
123 || !WPACKET_close(pkt)) {
124 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_EC_PT_FORMATS, ERR_R_INTERNAL_ERROR);
132 int tls_construct_ctos_supported_groups(SSL *s, WPACKET *pkt, int *al)
134 const unsigned char *pcurves = NULL, *pcurvestmp;
135 size_t num_curves = 0, i;
141 * Add TLS extension supported_groups to the ClientHello message
143 /* TODO(TLS1.3): Add support for DHE groups */
144 pcurves = s->tlsext_supportedgroupslist;
145 if (!tls1_get_curvelist(s, 0, &pcurves, &num_curves)) {
146 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_GROUPS,
147 ERR_R_INTERNAL_ERROR);
150 pcurvestmp = pcurves;
152 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_supported_groups)
153 /* Sub-packet for supported_groups extension */
154 || !WPACKET_start_sub_packet_u16(pkt)
155 || !WPACKET_start_sub_packet_u16(pkt)) {
156 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_GROUPS,
157 ERR_R_INTERNAL_ERROR);
160 /* Copy curve ID if supported */
161 for (i = 0; i < num_curves; i++, pcurvestmp += 2) {
162 if (tls_curve_allowed(s, pcurves, SSL_SECOP_CURVE_SUPPORTED)) {
163 if (!WPACKET_put_bytes_u8(pkt, pcurvestmp[0])
164 || !WPACKET_put_bytes_u8(pkt, pcurvestmp[1])) {
165 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_GROUPS,
166 ERR_R_INTERNAL_ERROR);
171 if (!WPACKET_close(pkt) || !WPACKET_close(pkt)) {
172 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_GROUPS,
173 ERR_R_INTERNAL_ERROR);
181 int tls_construct_ctos_session_ticket(SSL *s, WPACKET *pkt, int *al)
185 if (!tls_use_ticket(s))
188 if (!s->new_session && s->session != NULL
189 && s->session->tlsext_tick != NULL) {
190 ticklen = s->session->tlsext_ticklen;
191 } else if (s->session && s->tlsext_session_ticket != NULL
192 && s->tlsext_session_ticket->data != NULL) {
193 ticklen = s->tlsext_session_ticket->length;
194 s->session->tlsext_tick = OPENSSL_malloc(ticklen);
195 if (s->session->tlsext_tick == NULL) {
196 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SESSION_TICKET,
197 ERR_R_INTERNAL_ERROR);
200 memcpy(s->session->tlsext_tick,
201 s->tlsext_session_ticket->data, ticklen);
202 s->session->tlsext_ticklen = ticklen;
207 if (ticklen == 0 && s->tlsext_session_ticket != NULL &&
208 s->tlsext_session_ticket->data == NULL)
211 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_session_ticket)
212 || !WPACKET_sub_memcpy_u16(pkt, s->session->tlsext_tick, ticklen)) {
213 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SESSION_TICKET, ERR_R_INTERNAL_ERROR);
220 int tls_construct_ctos_sig_algs(SSL *s, WPACKET *pkt, int *al)
223 const unsigned char *salg;
225 if (!SSL_CLIENT_USE_SIGALGS(s))
228 salglen = tls12_get_psigalgs(s, &salg);
229 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_signature_algorithms)
230 /* Sub-packet for sig-algs extension */
231 || !WPACKET_start_sub_packet_u16(pkt)
232 /* Sub-packet for the actual list */
233 || !WPACKET_start_sub_packet_u16(pkt)
234 || !tls12_copy_sigalgs(s, pkt, salg, salglen)
235 || !WPACKET_close(pkt)
236 || !WPACKET_close(pkt)) {
237 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SIG_ALGS, ERR_R_INTERNAL_ERROR);
244 #ifndef OPENSSL_NO_OCSP
245 int tls_construct_ctos_status_request(SSL *s, WPACKET *pkt, int *al)
249 if (s->tlsext_status_type != TLSEXT_STATUSTYPE_ocsp)
252 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_status_request)
253 /* Sub-packet for status request extension */
254 || !WPACKET_start_sub_packet_u16(pkt)
255 || !WPACKET_put_bytes_u8(pkt, TLSEXT_STATUSTYPE_ocsp)
256 /* Sub-packet for the ids */
257 || !WPACKET_start_sub_packet_u16(pkt)) {
258 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_STATUS_REQUEST, ERR_R_INTERNAL_ERROR);
261 for (i = 0; i < sk_OCSP_RESPID_num(s->tlsext_ocsp_ids); i++) {
262 unsigned char *idbytes;
263 OCSP_RESPID *id = sk_OCSP_RESPID_value(s->tlsext_ocsp_ids, i);
264 int idlen = i2d_OCSP_RESPID(id, NULL);
267 /* Sub-packet for an individual id */
268 || !WPACKET_sub_allocate_bytes_u16(pkt, idlen, &idbytes)
269 || i2d_OCSP_RESPID(id, &idbytes) != idlen) {
270 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_STATUS_REQUEST,
271 ERR_R_INTERNAL_ERROR);
275 if (!WPACKET_close(pkt)
276 || !WPACKET_start_sub_packet_u16(pkt)) {
277 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_STATUS_REQUEST, ERR_R_INTERNAL_ERROR);
280 if (s->tlsext_ocsp_exts) {
281 unsigned char *extbytes;
282 int extlen = i2d_X509_EXTENSIONS(s->tlsext_ocsp_exts, NULL);
285 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_STATUS_REQUEST,
286 ERR_R_INTERNAL_ERROR);
289 if (!WPACKET_allocate_bytes(pkt, extlen, &extbytes)
290 || i2d_X509_EXTENSIONS(s->tlsext_ocsp_exts, &extbytes)
292 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_STATUS_REQUEST,
293 ERR_R_INTERNAL_ERROR);
297 if (!WPACKET_close(pkt) || !WPACKET_close(pkt)) {
298 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_STATUS_REQUEST, ERR_R_INTERNAL_ERROR);
306 #ifndef OPENSSL_NO_NEXTPROTONEG
307 int tls_construct_ctos_npn(SSL *s, WPACKET *pkt, int *al)
309 if (s->ctx->next_proto_select_cb == NULL || s->s3->tmp.finish_md_len != 0)
313 * The client advertises an empty extension to indicate its support
314 * for Next Protocol Negotiation
316 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_next_proto_neg)
317 || !WPACKET_put_bytes_u16(pkt, 0)) {
318 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_NPN, ERR_R_INTERNAL_ERROR);
326 int tls_construct_ctos_alpn(SSL *s, WPACKET *pkt, int *al)
328 s->s3->alpn_sent = 0;
331 * finish_md_len is non-zero during a renegotiation, so
332 * this avoids sending ALPN during the renegotiation
334 if (s->alpn_client_proto_list == NULL || s->s3->tmp.finish_md_len != 0)
337 if (!WPACKET_put_bytes_u16(pkt,
338 TLSEXT_TYPE_application_layer_protocol_negotiation)
339 /* Sub-packet ALPN extension */
340 || !WPACKET_start_sub_packet_u16(pkt)
341 || !WPACKET_sub_memcpy_u16(pkt, s->alpn_client_proto_list,
342 s->alpn_client_proto_list_len)
343 || !WPACKET_close(pkt)) {
344 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_ALPN, ERR_R_INTERNAL_ERROR);
347 s->s3->alpn_sent = 1;
353 #ifndef OPENSSL_NO_SRTP
354 int tls_construct_ctos_use_srtp(SSL *s, WPACKET *pkt, int *al)
356 STACK_OF(SRTP_PROTECTION_PROFILE) *clnt = SSL_get_srtp_profiles(s);
362 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_use_srtp)
363 /* Sub-packet for SRTP extension */
364 || !WPACKET_start_sub_packet_u16(pkt)
365 /* Sub-packet for the protection profile list */
366 || !WPACKET_start_sub_packet_u16(pkt)) {
367 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_USE_SRTP, ERR_R_INTERNAL_ERROR);
371 end = sk_SRTP_PROTECTION_PROFILE_num(clnt);
372 for (i = 0; i < end; i++) {
373 const SRTP_PROTECTION_PROFILE *prof =
374 sk_SRTP_PROTECTION_PROFILE_value(clnt, i);
376 if (prof == NULL || !WPACKET_put_bytes_u16(pkt, prof->id)) {
377 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_USE_SRTP, ERR_R_INTERNAL_ERROR);
381 if (!WPACKET_close(pkt)
382 /* Add an empty use_mki value */
383 || !WPACKET_put_bytes_u8(pkt, 0)
384 || !WPACKET_close(pkt)) {
385 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_USE_SRTP, ERR_R_INTERNAL_ERROR);
393 int tls_construct_ctos_etm(SSL *s, WPACKET *pkt, int *al)
395 if (s->options & SSL_OP_NO_ENCRYPT_THEN_MAC)
398 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_encrypt_then_mac)
399 || !WPACKET_put_bytes_u16(pkt, 0)) {
400 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_ETM, ERR_R_INTERNAL_ERROR);
407 #ifndef OPENSSL_NO_CT
408 int tls_construct_ctos_sct(SSL *s, WPACKET *pkt, int *al)
410 if (s->ct_validation_callback == NULL)
413 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_signed_certificate_timestamp)
414 || !WPACKET_put_bytes_u16(pkt, 0)) {
415 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SCT, ERR_R_INTERNAL_ERROR);
423 int tls_construct_ctos_ems(SSL *s, WPACKET *pkt, int *al)
425 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_extended_master_secret)
426 || !WPACKET_put_bytes_u16(pkt, 0)) {
427 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_EMS, ERR_R_INTERNAL_ERROR);
434 int tls_construct_ctos_supported_versions(SSL *s, WPACKET *pkt, int *al)
436 int currv, min_version, max_version, reason;
438 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_supported_versions)
439 || !WPACKET_start_sub_packet_u16(pkt)
440 || !WPACKET_start_sub_packet_u8(pkt)) {
441 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_VERSIONS,
442 ERR_R_INTERNAL_ERROR);
446 reason = ssl_get_client_min_max_version(s, &min_version, &max_version);
448 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_VERSIONS, reason);
453 * TODO(TLS1.3): There is some discussion on the TLS list as to wheter
454 * we should include versions <TLS1.2. For the moment we do. To be
457 for (currv = max_version; currv >= min_version; currv--) {
458 /* TODO(TLS1.3): Remove this first if clause prior to release!! */
459 if (currv == TLS1_3_VERSION) {
460 if (!WPACKET_put_bytes_u16(pkt, TLS1_3_VERSION_DRAFT)) {
461 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_VERSIONS,
462 ERR_R_INTERNAL_ERROR);
465 } else if (!WPACKET_put_bytes_u16(pkt, currv)) {
466 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_VERSIONS,
467 ERR_R_INTERNAL_ERROR);
471 if (!WPACKET_close(pkt) || !WPACKET_close(pkt)) {
472 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_VERSIONS,
473 ERR_R_INTERNAL_ERROR);
481 int tls_construct_ctos_key_share(SSL *s, WPACKET *pkt, int *al)
483 #ifndef OPENSSL_NO_TLS1_3
484 size_t i, sharessent = 0, num_curves = 0;
485 const unsigned char *pcurves = NULL;
487 /* key_share extension */
488 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_key_share)
489 /* Extension data sub-packet */
490 || !WPACKET_start_sub_packet_u16(pkt)
491 /* KeyShare list sub-packet */
492 || !WPACKET_start_sub_packet_u16(pkt)) {
493 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_KEY_SHARE, ERR_R_INTERNAL_ERROR);
497 pcurves = s->tlsext_supportedgroupslist;
498 if (!tls1_get_curvelist(s, 0, &pcurves, &num_curves)) {
499 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_KEY_SHARE, ERR_R_INTERNAL_ERROR);
504 * TODO(TLS1.3): Make the number of key_shares sent configurable. For
507 for (i = 0; i < num_curves && sharessent < 1; i++, pcurves += 2) {
508 unsigned char *encodedPoint = NULL;
509 unsigned int curve_id = 0;
510 EVP_PKEY *key_share_key = NULL;
513 if (!tls_curve_allowed(s, pcurves, SSL_SECOP_CURVE_SUPPORTED))
516 if (s->s3->tmp.pkey != NULL) {
517 /* Shouldn't happen! */
518 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_KEY_SHARE, ERR_R_INTERNAL_ERROR);
522 /* Generate a key for this key_share */
523 curve_id = (pcurves[0] << 8) | pcurves[1];
524 key_share_key = ssl_generate_pkey_curve(curve_id);
525 if (key_share_key == NULL) {
526 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_KEY_SHARE, ERR_R_EVP_LIB);
530 /* Encode the public key. */
531 encodedlen = EVP_PKEY_get1_tls_encodedpoint(key_share_key,
533 if (encodedlen == 0) {
534 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_KEY_SHARE, ERR_R_EC_LIB);
535 EVP_PKEY_free(key_share_key);
539 /* Create KeyShareEntry */
540 if (!WPACKET_put_bytes_u16(pkt, curve_id)
541 || !WPACKET_sub_memcpy_u16(pkt, encodedPoint, encodedlen)) {
542 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_KEY_SHARE, ERR_R_INTERNAL_ERROR);
543 EVP_PKEY_free(key_share_key);
544 OPENSSL_free(encodedPoint);
549 * TODO(TLS1.3): When changing to send more than one key_share we're
550 * going to need to be able to save more than one EVP_PKEY. For now
551 * we reuse the existing tmp.pkey
553 s->s3->group_id = curve_id;
554 s->s3->tmp.pkey = key_share_key;
556 OPENSSL_free(encodedPoint);
559 if (!WPACKET_close(pkt) || !WPACKET_close(pkt)) {
560 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_KEY_SHARE, ERR_R_INTERNAL_ERROR);
568 #define F5_WORKAROUND_MIN_MSG_LEN 0xff
569 #define F5_WORKAROUND_MAX_MSG_LEN 0x200
571 int tls_construct_ctos_padding(SSL *s, WPACKET *pkt, int *al)
573 unsigned char *padbytes;
576 if ((s->options & SSL_OP_TLSEXT_PADDING) == 0)
580 * Add padding to workaround bugs in F5 terminators. See
581 * https://tools.ietf.org/html/draft-agl-tls-padding-03 NB: because this
582 * code calculates the length of all existing extensions it MUST always
585 if (!WPACKET_get_total_written(pkt, &hlen)) {
586 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_PADDING, ERR_R_INTERNAL_ERROR);
590 if (hlen > F5_WORKAROUND_MIN_MSG_LEN && hlen < F5_WORKAROUND_MAX_MSG_LEN) {
591 /* Calculate the amond of padding we need to add */
592 hlen = F5_WORKAROUND_MAX_MSG_LEN - hlen;
595 * Take off the size of extension header itself (2 bytes for type and
596 * 2 bytes for length bytes)
603 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_padding)
604 || !WPACKET_sub_allocate_bytes_u16(pkt, hlen, &padbytes)) {
605 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_PADDING, ERR_R_INTERNAL_ERROR);
608 memset(padbytes, 0, hlen);
615 * Parse the server's renegotiation binding and abort if it's not right
617 int tls_parse_stoc_renegotiate(SSL *s, PACKET *pkt, int *al)
619 size_t expected_len = s->s3->previous_client_finished_len
620 + s->s3->previous_server_finished_len;
622 const unsigned char *data;
624 /* Check for logic errors */
625 assert(expected_len == 0 || s->s3->previous_client_finished_len != 0);
626 assert(expected_len == 0 || s->s3->previous_server_finished_len != 0);
628 /* Parse the length byte */
629 if (!PACKET_get_1_len(pkt, &ilen)) {
630 SSLerr(SSL_F_TLS_PARSE_STOC_RENEGOTIATE,
631 SSL_R_RENEGOTIATION_ENCODING_ERR);
632 *al = SSL_AD_ILLEGAL_PARAMETER;
636 /* Consistency check */
637 if (PACKET_remaining(pkt) != ilen) {
638 SSLerr(SSL_F_TLS_PARSE_STOC_RENEGOTIATE,
639 SSL_R_RENEGOTIATION_ENCODING_ERR);
640 *al = SSL_AD_ILLEGAL_PARAMETER;
644 /* Check that the extension matches */
645 if (ilen != expected_len) {
646 SSLerr(SSL_F_TLS_PARSE_STOC_RENEGOTIATE,
647 SSL_R_RENEGOTIATION_MISMATCH);
648 *al = SSL_AD_HANDSHAKE_FAILURE;
652 if (!PACKET_get_bytes(pkt, &data, s->s3->previous_client_finished_len)
653 || memcmp(data, s->s3->previous_client_finished,
654 s->s3->previous_client_finished_len) != 0) {
655 SSLerr(SSL_F_TLS_PARSE_STOC_RENEGOTIATE,
656 SSL_R_RENEGOTIATION_MISMATCH);
657 *al = SSL_AD_HANDSHAKE_FAILURE;
661 if (!PACKET_get_bytes(pkt, &data, s->s3->previous_server_finished_len)
662 || memcmp(data, s->s3->previous_server_finished,
663 s->s3->previous_server_finished_len) != 0) {
664 SSLerr(SSL_F_TLS_PARSE_STOC_RENEGOTIATE,
665 SSL_R_RENEGOTIATION_MISMATCH);
666 *al = SSL_AD_ILLEGAL_PARAMETER;
669 s->s3->send_connection_binding = 1;
674 int tls_parse_stoc_server_name(SSL *s, PACKET *pkt, int *al)
676 if (s->tlsext_hostname == NULL || PACKET_remaining(pkt) > 0) {
677 *al = SSL_AD_UNRECOGNIZED_NAME;
682 if (s->session->tlsext_hostname != NULL) {
683 *al = SSL_AD_INTERNAL_ERROR;
686 s->session->tlsext_hostname = OPENSSL_strdup(s->tlsext_hostname);
687 if (s->session->tlsext_hostname == NULL) {
688 *al = SSL_AD_INTERNAL_ERROR;
696 #ifndef OPENSSL_NO_EC
697 int tls_parse_stoc_ec_pt_formats(SSL *s, PACKET *pkt, int *al)
699 unsigned int ecpointformatlist_length;
700 PACKET ecptformatlist;
702 if (!PACKET_as_length_prefixed_1(pkt, &ecptformatlist)) {
703 *al = SSL_AD_DECODE_ERROR;
707 ecpointformatlist_length = PACKET_remaining(&ecptformatlist);
708 s->session->tlsext_ecpointformatlist_length = 0;
710 OPENSSL_free(s->session->tlsext_ecpointformatlist);
711 s->session->tlsext_ecpointformatlist =
712 OPENSSL_malloc(ecpointformatlist_length);
713 if (s->session->tlsext_ecpointformatlist == NULL) {
714 *al = SSL_AD_INTERNAL_ERROR;
718 s->session->tlsext_ecpointformatlist_length = ecpointformatlist_length;
720 if (!PACKET_copy_bytes(&ecptformatlist,
721 s->session->tlsext_ecpointformatlist,
722 ecpointformatlist_length)) {
723 *al = SSL_AD_INTERNAL_ERROR;
732 int tls_parse_stoc_session_ticket(SSL *s, PACKET *pkt, int *al)
734 if (s->tls_session_ticket_ext_cb != NULL &&
735 !s->tls_session_ticket_ext_cb(s, PACKET_data(pkt),
736 PACKET_remaining(pkt),
737 s->tls_session_ticket_ext_cb_arg)) {
738 *al = SSL_AD_INTERNAL_ERROR;
742 if (!tls_use_ticket(s) || PACKET_remaining(pkt) > 0) {
743 *al = SSL_AD_UNSUPPORTED_EXTENSION;
747 s->tlsext_ticket_expected = 1;
752 #ifndef OPENSSL_NO_OCSP
753 int tls_parse_stoc_status_request(SSL *s, PACKET *pkt, int *al)
756 * MUST be empty and only sent if we've requested a status
759 if (s->tlsext_status_type == TLSEXT_STATUSTYPE_nothing
760 || PACKET_remaining(pkt) > 0) {
761 *al = SSL_AD_UNSUPPORTED_EXTENSION;
764 /* Set flag to expect CertificateStatus message */
765 s->tlsext_status_expected = 1;
772 #ifndef OPENSSL_NO_CT
773 int tls_parse_stoc_sct(SSL *s, PACKET *pkt, int *al)
776 * Only take it if we asked for it - i.e if there is no CT validation
777 * callback set, then a custom extension MAY be processing it, so we
778 * need to let control continue to flow to that.
780 if (s->ct_validation_callback != NULL) {
781 size_t size = PACKET_remaining(pkt);
783 /* Simply copy it off for later processing */
784 OPENSSL_free(s->tlsext_scts);
785 s->tlsext_scts = NULL;
787 s->tlsext_scts_len = size;
789 s->tlsext_scts = OPENSSL_malloc(size);
790 if (s->tlsext_scts == NULL
791 || !PACKET_copy_bytes(pkt, s->tlsext_scts, size)) {
792 *al = SSL_AD_INTERNAL_ERROR;
797 if (custom_ext_parse(s, 0, TLSEXT_TYPE_signed_certificate_timestamp,
798 PACKET_data(pkt), PACKET_remaining(pkt), al) <= 0)
807 #ifndef OPENSSL_NO_NEXTPROTONEG
809 * ssl_next_proto_validate validates a Next Protocol Negotiation block. No
810 * elements of zero length are allowed and the set of elements must exactly
811 * fill the length of the block. Returns 1 on success or 0 on failure.
813 static int ssl_next_proto_validate(PACKET *pkt)
817 while (PACKET_remaining(pkt)) {
818 if (!PACKET_get_length_prefixed_1(pkt, &tmp_protocol)
819 || PACKET_remaining(&tmp_protocol) == 0)
826 int tls_parse_stoc_npn(SSL *s, PACKET *pkt, int *al)
828 unsigned char *selected;
829 unsigned char selected_len;
832 /* Check if we are in a renegotiation. If so ignore this extension */
833 if (s->s3->tmp.finish_md_len != 0)
836 /* We must have requested it. */
837 if (s->ctx->next_proto_select_cb == NULL) {
838 *al = SSL_AD_UNSUPPORTED_EXTENSION;
842 /* The data must be valid */
844 if (!ssl_next_proto_validate(&tmppkt)) {
845 *al = SSL_AD_DECODE_ERROR;
848 if (s->ctx->next_proto_select_cb(s, &selected, &selected_len,
850 PACKET_remaining(pkt),
851 s->ctx->next_proto_select_cb_arg) !=
853 *al = SSL_AD_INTERNAL_ERROR;
858 * Could be non-NULL if server has sent multiple NPN extensions in
859 * a single Serverhello
861 OPENSSL_free(s->next_proto_negotiated);
862 s->next_proto_negotiated = OPENSSL_malloc(selected_len);
863 if (s->next_proto_negotiated == NULL) {
864 *al = SSL_AD_INTERNAL_ERROR;
868 memcpy(s->next_proto_negotiated, selected, selected_len);
869 s->next_proto_negotiated_len = selected_len;
870 s->s3->next_proto_neg_seen = 1;
876 int tls_parse_stoc_alpn(SSL *s, PACKET *pkt, int *al)
880 /* We must have requested it. */
881 if (!s->s3->alpn_sent) {
882 *al = SSL_AD_UNSUPPORTED_EXTENSION;
886 * The extension data consists of:
888 * uint8 proto_length;
889 * uint8 proto[proto_length];
891 if (!PACKET_get_net_2_len(pkt, &len)
892 || PACKET_remaining(pkt) != len || !PACKET_get_1_len(pkt, &len)
893 || PACKET_remaining(pkt) != len) {
894 *al = SSL_AD_DECODE_ERROR;
897 OPENSSL_free(s->s3->alpn_selected);
898 s->s3->alpn_selected = OPENSSL_malloc(len);
899 if (s->s3->alpn_selected == NULL) {
900 *al = SSL_AD_INTERNAL_ERROR;
903 if (!PACKET_copy_bytes(pkt, s->s3->alpn_selected, len)) {
904 *al = SSL_AD_DECODE_ERROR;
907 s->s3->alpn_selected_len = len;
912 #ifndef OPENSSL_NO_SRTP
913 int tls_parse_stoc_use_srtp(SSL *s, PACKET *pkt, int *al)
915 unsigned int id, ct, mki;
917 STACK_OF(SRTP_PROTECTION_PROFILE) *clnt;
918 SRTP_PROTECTION_PROFILE *prof;
920 if (!PACKET_get_net_2(pkt, &ct) || ct != 2
921 || !PACKET_get_net_2(pkt, &id)
922 || !PACKET_get_1(pkt, &mki)
923 || PACKET_remaining(pkt) != 0) {
924 SSLerr(SSL_F_TLS_PARSE_STOC_USE_SRTP,
925 SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST);
926 *al = SSL_AD_DECODE_ERROR;
931 /* Must be no MKI, since we never offer one */
932 SSLerr(SSL_F_TLS_PARSE_STOC_USE_SRTP, SSL_R_BAD_SRTP_MKI_VALUE);
933 *al = SSL_AD_ILLEGAL_PARAMETER;
937 /* Throw an error if the server gave us an unsolicited extension */
938 clnt = SSL_get_srtp_profiles(s);
940 SSLerr(SSL_F_TLS_PARSE_STOC_USE_SRTP, SSL_R_NO_SRTP_PROFILES);
941 *al = SSL_AD_DECODE_ERROR;
946 * Check to see if the server gave us something we support (and
947 * presumably offered)
949 for (i = 0; i < sk_SRTP_PROTECTION_PROFILE_num(clnt); i++) {
950 prof = sk_SRTP_PROTECTION_PROFILE_value(clnt, i);
952 if (prof->id == id) {
953 s->srtp_profile = prof;
959 SSLerr(SSL_F_TLS_PARSE_STOC_USE_SRTP,
960 SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST);
961 *al = SSL_AD_DECODE_ERROR;
966 int tls_parse_stoc_etm(SSL *s, PACKET *pkt, int *al)
968 /* Ignore if inappropriate ciphersuite */
969 if (!(s->options & SSL_OP_NO_ENCRYPT_THEN_MAC)
970 && s->s3->tmp.new_cipher->algorithm_mac != SSL_AEAD
971 && s->s3->tmp.new_cipher->algorithm_enc != SSL_RC4)
972 s->s3->flags |= TLS1_FLAGS_ENCRYPT_THEN_MAC;
977 int tls_parse_stoc_ems(SSL *s, PACKET *pkt, int *al)
979 s->s3->flags |= TLS1_FLAGS_RECEIVED_EXTMS;
981 s->session->flags |= SSL_SESS_FLAG_EXTMS;
986 int tls_parse_stoc_key_share(SSL *s, PACKET *pkt, int *al)
988 #ifndef OPENSSL_NO_TLS1_3
989 unsigned int group_id;
991 EVP_PKEY *ckey = s->s3->tmp.pkey, *skey = NULL;
995 *al = SSL_AD_INTERNAL_ERROR;
996 SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE, ERR_R_INTERNAL_ERROR);
1000 if (!PACKET_get_net_2(pkt, &group_id)) {
1001 *al = SSL_AD_HANDSHAKE_FAILURE;
1002 SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE, SSL_R_LENGTH_MISMATCH);
1006 if (group_id != s->s3->group_id) {
1008 * This isn't for the group that we sent in the original
1011 *al = SSL_AD_HANDSHAKE_FAILURE;
1012 SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE, SSL_R_BAD_KEY_SHARE);
1016 if (!PACKET_as_length_prefixed_2(pkt, &encoded_pt)
1017 || PACKET_remaining(&encoded_pt) == 0) {
1018 *al = SSL_AD_DECODE_ERROR;
1019 SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE, SSL_R_LENGTH_MISMATCH);
1023 skey = ssl_generate_pkey(ckey);
1025 *al = SSL_AD_INTERNAL_ERROR;
1026 SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE, ERR_R_MALLOC_FAILURE);
1029 if (!EVP_PKEY_set1_tls_encodedpoint(skey, PACKET_data(&encoded_pt),
1030 PACKET_remaining(&encoded_pt))) {
1031 *al = SSL_AD_DECODE_ERROR;
1032 SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE, SSL_R_BAD_ECPOINT);
1033 EVP_PKEY_free(skey);
1037 if (ssl_derive(s, ckey, skey, 1) == 0) {
1038 *al = SSL_AD_INTERNAL_ERROR;
1039 SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE, ERR_R_INTERNAL_ERROR);
1040 EVP_PKEY_free(skey);
1043 EVP_PKEY_free(skey);