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 size_t i, sharessent = 0, num_curves = 0;
484 const unsigned char *pcurves = NULL;
486 /* key_share extension */
487 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_key_share)
488 /* Extension data sub-packet */
489 || !WPACKET_start_sub_packet_u16(pkt)
490 /* KeyShare list sub-packet */
491 || !WPACKET_start_sub_packet_u16(pkt)) {
492 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_KEY_SHARE, ERR_R_INTERNAL_ERROR);
496 pcurves = s->tlsext_supportedgroupslist;
497 if (!tls1_get_curvelist(s, 0, &pcurves, &num_curves)) {
498 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_KEY_SHARE, ERR_R_INTERNAL_ERROR);
503 * TODO(TLS1.3): Make the number of key_shares sent configurable. For
506 for (i = 0; i < num_curves && sharessent < 1; i++, pcurves += 2) {
507 unsigned char *encodedPoint = NULL;
508 unsigned int curve_id = 0;
509 EVP_PKEY *key_share_key = NULL;
512 if (!tls_curve_allowed(s, pcurves, SSL_SECOP_CURVE_SUPPORTED))
515 if (s->s3->tmp.pkey != NULL) {
516 /* Shouldn't happen! */
517 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_KEY_SHARE, ERR_R_INTERNAL_ERROR);
521 /* Generate a key for this key_share */
522 curve_id = (pcurves[0] << 8) | pcurves[1];
523 key_share_key = ssl_generate_pkey_curve(curve_id);
524 if (key_share_key == NULL) {
525 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_KEY_SHARE, ERR_R_EVP_LIB);
529 /* Encode the public key. */
530 encodedlen = EVP_PKEY_get1_tls_encodedpoint(key_share_key,
532 if (encodedlen == 0) {
533 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_KEY_SHARE, ERR_R_EC_LIB);
534 EVP_PKEY_free(key_share_key);
538 /* Create KeyShareEntry */
539 if (!WPACKET_put_bytes_u16(pkt, curve_id)
540 || !WPACKET_sub_memcpy_u16(pkt, encodedPoint, encodedlen)) {
541 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_KEY_SHARE, ERR_R_INTERNAL_ERROR);
542 EVP_PKEY_free(key_share_key);
543 OPENSSL_free(encodedPoint);
548 * TODO(TLS1.3): When changing to send more than one key_share we're
549 * going to need to be able to save more than one EVP_PKEY. For now
550 * we reuse the existing tmp.pkey
552 s->s3->group_id = curve_id;
553 s->s3->tmp.pkey = key_share_key;
555 OPENSSL_free(encodedPoint);
558 if (!WPACKET_close(pkt) || !WPACKET_close(pkt)) {
559 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_KEY_SHARE, ERR_R_INTERNAL_ERROR);
566 #define F5_WORKAROUND_MIN_MSG_LEN 0xff
567 #define F5_WORKAROUND_MAX_MSG_LEN 0x200
569 int tls_construct_ctos_padding(SSL *s, WPACKET *pkt, int *al)
571 unsigned char *padbytes;
574 if ((s->options & SSL_OP_TLSEXT_PADDING) == 0)
578 * Add padding to workaround bugs in F5 terminators. See
579 * https://tools.ietf.org/html/draft-agl-tls-padding-03 NB: because this
580 * code calculates the length of all existing extensions it MUST always
583 if (!WPACKET_get_total_written(pkt, &hlen)) {
584 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_PADDING, ERR_R_INTERNAL_ERROR);
588 if (hlen > F5_WORKAROUND_MIN_MSG_LEN && hlen < F5_WORKAROUND_MAX_MSG_LEN) {
589 /* Calculate the amond of padding we need to add */
590 hlen = F5_WORKAROUND_MAX_MSG_LEN - hlen;
593 * Take off the size of extension header itself (2 bytes for type and
594 * 2 bytes for length bytes)
601 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_padding)
602 || !WPACKET_sub_allocate_bytes_u16(pkt, hlen, &padbytes)) {
603 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_PADDING, ERR_R_INTERNAL_ERROR);
606 memset(padbytes, 0, hlen);
613 * Parse the server's renegotiation binding and abort if it's not right
615 int tls_parse_stoc_renegotiate(SSL *s, PACKET *pkt, int *al)
617 size_t expected_len = s->s3->previous_client_finished_len
618 + s->s3->previous_server_finished_len;
620 const unsigned char *data;
622 /* Check for logic errors */
623 assert(expected_len == 0 || s->s3->previous_client_finished_len != 0);
624 assert(expected_len == 0 || s->s3->previous_server_finished_len != 0);
626 /* Parse the length byte */
627 if (!PACKET_get_1_len(pkt, &ilen)) {
628 SSLerr(SSL_F_TLS_PARSE_STOC_RENEGOTIATE,
629 SSL_R_RENEGOTIATION_ENCODING_ERR);
630 *al = SSL_AD_ILLEGAL_PARAMETER;
634 /* Consistency check */
635 if (PACKET_remaining(pkt) != ilen) {
636 SSLerr(SSL_F_TLS_PARSE_STOC_RENEGOTIATE,
637 SSL_R_RENEGOTIATION_ENCODING_ERR);
638 *al = SSL_AD_ILLEGAL_PARAMETER;
642 /* Check that the extension matches */
643 if (ilen != expected_len) {
644 SSLerr(SSL_F_TLS_PARSE_STOC_RENEGOTIATE,
645 SSL_R_RENEGOTIATION_MISMATCH);
646 *al = SSL_AD_HANDSHAKE_FAILURE;
650 if (!PACKET_get_bytes(pkt, &data, s->s3->previous_client_finished_len)
651 || memcmp(data, s->s3->previous_client_finished,
652 s->s3->previous_client_finished_len) != 0) {
653 SSLerr(SSL_F_TLS_PARSE_STOC_RENEGOTIATE,
654 SSL_R_RENEGOTIATION_MISMATCH);
655 *al = SSL_AD_HANDSHAKE_FAILURE;
659 if (!PACKET_get_bytes(pkt, &data, s->s3->previous_server_finished_len)
660 || memcmp(data, s->s3->previous_server_finished,
661 s->s3->previous_server_finished_len) != 0) {
662 SSLerr(SSL_F_TLS_PARSE_STOC_RENEGOTIATE,
663 SSL_R_RENEGOTIATION_MISMATCH);
664 *al = SSL_AD_ILLEGAL_PARAMETER;
667 s->s3->send_connection_binding = 1;
672 int tls_parse_stoc_server_name(SSL *s, PACKET *pkt, int *al)
674 if (s->tlsext_hostname == NULL || PACKET_remaining(pkt) > 0) {
675 *al = SSL_AD_UNRECOGNIZED_NAME;
680 if (s->session->tlsext_hostname != NULL) {
681 *al = SSL_AD_INTERNAL_ERROR;
684 s->session->tlsext_hostname = OPENSSL_strdup(s->tlsext_hostname);
685 if (s->session->tlsext_hostname == NULL) {
686 *al = SSL_AD_INTERNAL_ERROR;
694 #ifndef OPENSSL_NO_EC
695 int tls_parse_stoc_ec_pt_formats(SSL *s, PACKET *pkt, int *al)
697 unsigned int ecpointformatlist_length;
698 PACKET ecptformatlist;
700 if (!PACKET_as_length_prefixed_1(pkt, &ecptformatlist)) {
701 *al = SSL_AD_DECODE_ERROR;
705 ecpointformatlist_length = PACKET_remaining(&ecptformatlist);
706 s->session->tlsext_ecpointformatlist_length = 0;
708 OPENSSL_free(s->session->tlsext_ecpointformatlist);
709 s->session->tlsext_ecpointformatlist =
710 OPENSSL_malloc(ecpointformatlist_length);
711 if (s->session->tlsext_ecpointformatlist == NULL) {
712 *al = SSL_AD_INTERNAL_ERROR;
716 s->session->tlsext_ecpointformatlist_length = ecpointformatlist_length;
718 if (!PACKET_copy_bytes(&ecptformatlist,
719 s->session->tlsext_ecpointformatlist,
720 ecpointformatlist_length)) {
721 *al = SSL_AD_INTERNAL_ERROR;
730 int tls_parse_stoc_session_ticket(SSL *s, PACKET *pkt, int *al)
732 if (s->tls_session_ticket_ext_cb != NULL &&
733 !s->tls_session_ticket_ext_cb(s, PACKET_data(pkt),
734 PACKET_remaining(pkt),
735 s->tls_session_ticket_ext_cb_arg)) {
736 *al = SSL_AD_INTERNAL_ERROR;
740 if (!tls_use_ticket(s) || PACKET_remaining(pkt) > 0) {
741 *al = SSL_AD_UNSUPPORTED_EXTENSION;
745 s->tlsext_ticket_expected = 1;
750 #ifndef OPENSSL_NO_OCSP
751 int tls_parse_stoc_status_request(SSL *s, PACKET *pkt, int *al)
754 * MUST be empty and only sent if we've requested a status
757 if (s->tlsext_status_type == TLSEXT_STATUSTYPE_nothing
758 || PACKET_remaining(pkt) > 0) {
759 *al = SSL_AD_UNSUPPORTED_EXTENSION;
762 /* Set flag to expect CertificateStatus message */
763 s->tlsext_status_expected = 1;
770 #ifndef OPENSSL_NO_CT
771 int tls_parse_stoc_sct(SSL *s, PACKET *pkt, int *al)
774 * Only take it if we asked for it - i.e if there is no CT validation
775 * callback set, then a custom extension MAY be processing it, so we
776 * need to let control continue to flow to that.
778 if (s->ct_validation_callback != NULL) {
779 size_t size = PACKET_remaining(pkt);
781 /* Simply copy it off for later processing */
782 OPENSSL_free(s->tlsext_scts);
783 s->tlsext_scts = NULL;
785 s->tlsext_scts_len = size;
787 s->tlsext_scts = OPENSSL_malloc(size);
788 if (s->tlsext_scts == NULL
789 || !PACKET_copy_bytes(pkt, s->tlsext_scts, size)) {
790 *al = SSL_AD_INTERNAL_ERROR;
795 if (custom_ext_parse(s, 0, TLSEXT_TYPE_signed_certificate_timestamp,
796 PACKET_data(pkt), PACKET_remaining(pkt), al) <= 0)
805 #ifndef OPENSSL_NO_NEXTPROTONEG
807 * ssl_next_proto_validate validates a Next Protocol Negotiation block. No
808 * elements of zero length are allowed and the set of elements must exactly
809 * fill the length of the block. Returns 1 on success or 0 on failure.
811 static int ssl_next_proto_validate(PACKET *pkt)
815 while (PACKET_remaining(pkt)) {
816 if (!PACKET_get_length_prefixed_1(pkt, &tmp_protocol)
817 || PACKET_remaining(&tmp_protocol) == 0)
824 int tls_parse_stoc_npn(SSL *s, PACKET *pkt, int *al)
826 unsigned char *selected;
827 unsigned char selected_len;
830 /* Check if we are in a renegotiation. If so ignore this extension */
831 if (s->s3->tmp.finish_md_len != 0)
834 /* We must have requested it. */
835 if (s->ctx->next_proto_select_cb == NULL) {
836 *al = SSL_AD_UNSUPPORTED_EXTENSION;
840 /* The data must be valid */
842 if (!ssl_next_proto_validate(&tmppkt)) {
843 *al = SSL_AD_DECODE_ERROR;
846 if (s->ctx->next_proto_select_cb(s, &selected, &selected_len,
848 PACKET_remaining(pkt),
849 s->ctx->next_proto_select_cb_arg) !=
851 *al = SSL_AD_INTERNAL_ERROR;
856 * Could be non-NULL if server has sent multiple NPN extensions in
857 * a single Serverhello
859 OPENSSL_free(s->next_proto_negotiated);
860 s->next_proto_negotiated = OPENSSL_malloc(selected_len);
861 if (s->next_proto_negotiated == NULL) {
862 *al = SSL_AD_INTERNAL_ERROR;
866 memcpy(s->next_proto_negotiated, selected, selected_len);
867 s->next_proto_negotiated_len = selected_len;
868 s->s3->next_proto_neg_seen = 1;
874 int tls_parse_stoc_alpn(SSL *s, PACKET *pkt, int *al)
878 /* We must have requested it. */
879 if (!s->s3->alpn_sent) {
880 *al = SSL_AD_UNSUPPORTED_EXTENSION;
884 * The extension data consists of:
886 * uint8 proto_length;
887 * uint8 proto[proto_length];
889 if (!PACKET_get_net_2_len(pkt, &len)
890 || PACKET_remaining(pkt) != len || !PACKET_get_1_len(pkt, &len)
891 || PACKET_remaining(pkt) != len) {
892 *al = SSL_AD_DECODE_ERROR;
895 OPENSSL_free(s->s3->alpn_selected);
896 s->s3->alpn_selected = OPENSSL_malloc(len);
897 if (s->s3->alpn_selected == NULL) {
898 *al = SSL_AD_INTERNAL_ERROR;
901 if (!PACKET_copy_bytes(pkt, s->s3->alpn_selected, len)) {
902 *al = SSL_AD_DECODE_ERROR;
905 s->s3->alpn_selected_len = len;
910 #ifndef OPENSSL_NO_SRTP
911 int tls_parse_stoc_use_srtp(SSL *s, PACKET *pkt, int *al)
913 unsigned int id, ct, mki;
915 STACK_OF(SRTP_PROTECTION_PROFILE) *clnt;
916 SRTP_PROTECTION_PROFILE *prof;
918 if (!PACKET_get_net_2(pkt, &ct) || ct != 2
919 || !PACKET_get_net_2(pkt, &id)
920 || !PACKET_get_1(pkt, &mki)
921 || PACKET_remaining(pkt) != 0) {
922 SSLerr(SSL_F_TLS_PARSE_STOC_USE_SRTP,
923 SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST);
924 *al = SSL_AD_DECODE_ERROR;
929 /* Must be no MKI, since we never offer one */
930 SSLerr(SSL_F_TLS_PARSE_STOC_USE_SRTP, SSL_R_BAD_SRTP_MKI_VALUE);
931 *al = SSL_AD_ILLEGAL_PARAMETER;
935 /* Throw an error if the server gave us an unsolicited extension */
936 clnt = SSL_get_srtp_profiles(s);
938 SSLerr(SSL_F_TLS_PARSE_STOC_USE_SRTP, SSL_R_NO_SRTP_PROFILES);
939 *al = SSL_AD_DECODE_ERROR;
944 * Check to see if the server gave us something we support (and
945 * presumably offered)
947 for (i = 0; i < sk_SRTP_PROTECTION_PROFILE_num(clnt); i++) {
948 prof = sk_SRTP_PROTECTION_PROFILE_value(clnt, i);
950 if (prof->id == id) {
951 s->srtp_profile = prof;
957 SSLerr(SSL_F_TLS_PARSE_STOC_USE_SRTP,
958 SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST);
959 *al = SSL_AD_DECODE_ERROR;
964 int tls_parse_stoc_etm(SSL *s, PACKET *pkt, int *al)
966 /* Ignore if inappropriate ciphersuite */
967 if (!(s->options & SSL_OP_NO_ENCRYPT_THEN_MAC)
968 && s->s3->tmp.new_cipher->algorithm_mac != SSL_AEAD
969 && s->s3->tmp.new_cipher->algorithm_enc != SSL_RC4)
970 s->s3->flags |= TLS1_FLAGS_ENCRYPT_THEN_MAC;
975 int tls_parse_stoc_ems(SSL *s, PACKET *pkt, int *al)
977 s->s3->flags |= TLS1_FLAGS_RECEIVED_EXTMS;
979 s->session->flags |= SSL_SESS_FLAG_EXTMS;
984 int tls_parse_stoc_key_share(SSL *s, PACKET *pkt, int *al)
986 unsigned int group_id;
988 EVP_PKEY *ckey = s->s3->tmp.pkey, *skey = NULL;
992 *al = SSL_AD_INTERNAL_ERROR;
993 SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE, ERR_R_INTERNAL_ERROR);
997 if (!PACKET_get_net_2(pkt, &group_id)) {
998 *al = SSL_AD_HANDSHAKE_FAILURE;
999 SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE, SSL_R_LENGTH_MISMATCH);
1003 if (group_id != s->s3->group_id) {
1005 * This isn't for the group that we sent in the original
1008 *al = SSL_AD_HANDSHAKE_FAILURE;
1009 SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE, SSL_R_BAD_KEY_SHARE);
1013 if (!PACKET_as_length_prefixed_2(pkt, &encoded_pt)
1014 || PACKET_remaining(&encoded_pt) == 0) {
1015 *al = SSL_AD_DECODE_ERROR;
1016 SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE, SSL_R_LENGTH_MISMATCH);
1020 skey = ssl_generate_pkey(ckey);
1022 *al = SSL_AD_INTERNAL_ERROR;
1023 SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE, ERR_R_MALLOC_FAILURE);
1026 if (!EVP_PKEY_set1_tls_encodedpoint(skey, PACKET_data(&encoded_pt),
1027 PACKET_remaining(&encoded_pt))) {
1028 *al = SSL_AD_DECODE_ERROR;
1029 SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE, SSL_R_BAD_ECPOINT);
1030 EVP_PKEY_free(skey);
1034 if (ssl_derive(s, ckey, skey, 1) == 0) {
1035 *al = SSL_AD_INTERNAL_ERROR;
1036 SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE, ERR_R_INTERNAL_ERROR);
1037 EVP_PKEY_free(skey);
1040 EVP_PKEY_free(skey);