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, X509 *x,
16 size_t chainidx, int *al)
18 /* Add RI if renegotiating */
22 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_renegotiate)
23 || !WPACKET_start_sub_packet_u16(pkt)
24 || !WPACKET_sub_memcpy_u8(pkt, s->s3->previous_client_finished,
25 s->s3->previous_client_finished_len)
26 || !WPACKET_close(pkt)) {
27 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_RENEGOTIATE, ERR_R_INTERNAL_ERROR);
34 int tls_construct_ctos_server_name(SSL *s, WPACKET *pkt, X509 *x,
35 size_t chainidx, int *al)
37 if (s->ext.hostname == NULL)
40 /* Add TLS extension servername to the Client Hello message */
41 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_server_name)
42 /* Sub-packet for server_name extension */
43 || !WPACKET_start_sub_packet_u16(pkt)
44 /* Sub-packet for servername list (always 1 hostname)*/
45 || !WPACKET_start_sub_packet_u16(pkt)
46 || !WPACKET_put_bytes_u8(pkt, TLSEXT_NAMETYPE_host_name)
47 || !WPACKET_sub_memcpy_u16(pkt, s->ext.hostname,
48 strlen(s->ext.hostname))
49 || !WPACKET_close(pkt)
50 || !WPACKET_close(pkt)) {
51 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SERVER_NAME, ERR_R_INTERNAL_ERROR);
58 #ifndef OPENSSL_NO_SRP
59 int tls_construct_ctos_srp(SSL *s, WPACKET *pkt, X509 *x, size_t chainidx,
62 /* Add SRP username if there is one */
63 if (s->srp_ctx.login == NULL)
66 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_srp)
67 /* Sub-packet for SRP extension */
68 || !WPACKET_start_sub_packet_u16(pkt)
69 || !WPACKET_start_sub_packet_u8(pkt)
70 /* login must not be zero...internal error if so */
71 || !WPACKET_set_flags(pkt, WPACKET_FLAGS_NON_ZERO_LENGTH)
72 || !WPACKET_memcpy(pkt, s->srp_ctx.login,
73 strlen(s->srp_ctx.login))
74 || !WPACKET_close(pkt)
75 || !WPACKET_close(pkt)) {
76 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SRP, ERR_R_INTERNAL_ERROR);
85 static int use_ecc(SSL *s)
88 unsigned long alg_k, alg_a;
89 STACK_OF(SSL_CIPHER) *cipher_stack = NULL;
91 /* See if we support any ECC ciphersuites */
92 if (s->version == SSL3_VERSION)
95 cipher_stack = SSL_get_ciphers(s);
96 end = sk_SSL_CIPHER_num(cipher_stack);
97 for (i = 0; i < end; i++) {
98 const SSL_CIPHER *c = sk_SSL_CIPHER_value(cipher_stack, i);
100 alg_k = c->algorithm_mkey;
101 alg_a = c->algorithm_auth;
102 if ((alg_k & (SSL_kECDHE | SSL_kECDHEPSK))
103 || (alg_a & SSL_aECDSA)
104 || c->min_tls >= TLS1_3_VERSION)
111 int tls_construct_ctos_ec_pt_formats(SSL *s, WPACKET *pkt, X509 *x,
112 size_t chainidx, int *al)
114 const unsigned char *pformats;
120 /* Add TLS extension ECPointFormats to the ClientHello message */
121 tls1_get_formatlist(s, &pformats, &num_formats);
123 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_ec_point_formats)
124 /* Sub-packet for formats extension */
125 || !WPACKET_start_sub_packet_u16(pkt)
126 || !WPACKET_sub_memcpy_u8(pkt, pformats, num_formats)
127 || !WPACKET_close(pkt)) {
128 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_EC_PT_FORMATS, ERR_R_INTERNAL_ERROR);
135 int tls_construct_ctos_supported_groups(SSL *s, WPACKET *pkt, X509 *x,
136 size_t chainidx, int *al)
138 const unsigned char *pcurves = NULL, *pcurvestmp;
139 size_t num_curves = 0, i;
145 * Add TLS extension supported_groups to the ClientHello message
147 /* TODO(TLS1.3): Add support for DHE groups */
148 pcurves = s->ext.supportedgroups;
149 if (!tls1_get_curvelist(s, 0, &pcurves, &num_curves)) {
150 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_GROUPS,
151 ERR_R_INTERNAL_ERROR);
154 pcurvestmp = pcurves;
156 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_supported_groups)
157 /* Sub-packet for supported_groups extension */
158 || !WPACKET_start_sub_packet_u16(pkt)
159 || !WPACKET_start_sub_packet_u16(pkt)) {
160 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_GROUPS,
161 ERR_R_INTERNAL_ERROR);
164 /* Copy curve ID if supported */
165 for (i = 0; i < num_curves; i++, pcurvestmp += 2) {
166 if (tls_curve_allowed(s, pcurves, SSL_SECOP_CURVE_SUPPORTED)) {
167 if (!WPACKET_put_bytes_u8(pkt, pcurvestmp[0])
168 || !WPACKET_put_bytes_u8(pkt, pcurvestmp[1])) {
169 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_GROUPS,
170 ERR_R_INTERNAL_ERROR);
175 if (!WPACKET_close(pkt) || !WPACKET_close(pkt)) {
176 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_GROUPS,
177 ERR_R_INTERNAL_ERROR);
185 int tls_construct_ctos_session_ticket(SSL *s, WPACKET *pkt, X509 *x,
186 size_t chainidx, int *al)
190 if (!tls_use_ticket(s))
193 if (!s->new_session && s->session != NULL
194 && s->session->ext.tick != NULL) {
195 ticklen = s->session->ext.ticklen;
196 } else if (s->session && s->ext.session_ticket != NULL
197 && s->ext.session_ticket->data != NULL) {
198 ticklen = s->ext.session_ticket->length;
199 s->session->ext.tick = OPENSSL_malloc(ticklen);
200 if (s->session->ext.tick == NULL) {
201 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SESSION_TICKET,
202 ERR_R_INTERNAL_ERROR);
205 memcpy(s->session->ext.tick,
206 s->ext.session_ticket->data, ticklen);
207 s->session->ext.ticklen = ticklen;
212 if (ticklen == 0 && s->ext.session_ticket != NULL &&
213 s->ext.session_ticket->data == NULL)
216 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_session_ticket)
217 || !WPACKET_sub_memcpy_u16(pkt, s->session->ext.tick, ticklen)) {
218 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SESSION_TICKET, ERR_R_INTERNAL_ERROR);
225 int tls_construct_ctos_sig_algs(SSL *s, WPACKET *pkt, X509 *x, size_t chainidx,
229 const unsigned int *salg;
231 if (!SSL_CLIENT_USE_SIGALGS(s))
234 salglen = tls12_get_psigalgs(s, 1, &salg);
235 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_signature_algorithms)
236 /* Sub-packet for sig-algs extension */
237 || !WPACKET_start_sub_packet_u16(pkt)
238 /* Sub-packet for the actual list */
239 || !WPACKET_start_sub_packet_u16(pkt)
240 || !tls12_copy_sigalgs(s, pkt, salg, salglen)
241 || !WPACKET_close(pkt)
242 || !WPACKET_close(pkt)) {
243 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SIG_ALGS, ERR_R_INTERNAL_ERROR);
250 #ifndef OPENSSL_NO_OCSP
251 int tls_construct_ctos_status_request(SSL *s, WPACKET *pkt, X509 *x,
252 size_t chainidx, int *al)
256 /* This extension isn't defined for client Certificates */
260 if (s->ext.status_type != TLSEXT_STATUSTYPE_ocsp)
263 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_status_request)
264 /* Sub-packet for status request extension */
265 || !WPACKET_start_sub_packet_u16(pkt)
266 || !WPACKET_put_bytes_u8(pkt, TLSEXT_STATUSTYPE_ocsp)
267 /* Sub-packet for the ids */
268 || !WPACKET_start_sub_packet_u16(pkt)) {
269 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_STATUS_REQUEST, ERR_R_INTERNAL_ERROR);
272 for (i = 0; i < sk_OCSP_RESPID_num(s->ext.ocsp.ids); i++) {
273 unsigned char *idbytes;
274 OCSP_RESPID *id = sk_OCSP_RESPID_value(s->ext.ocsp.ids, i);
275 int idlen = i2d_OCSP_RESPID(id, NULL);
278 /* Sub-packet for an individual id */
279 || !WPACKET_sub_allocate_bytes_u16(pkt, idlen, &idbytes)
280 || i2d_OCSP_RESPID(id, &idbytes) != idlen) {
281 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_STATUS_REQUEST,
282 ERR_R_INTERNAL_ERROR);
286 if (!WPACKET_close(pkt)
287 || !WPACKET_start_sub_packet_u16(pkt)) {
288 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_STATUS_REQUEST, ERR_R_INTERNAL_ERROR);
291 if (s->ext.ocsp.exts) {
292 unsigned char *extbytes;
293 int extlen = i2d_X509_EXTENSIONS(s->ext.ocsp.exts, NULL);
296 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_STATUS_REQUEST,
297 ERR_R_INTERNAL_ERROR);
300 if (!WPACKET_allocate_bytes(pkt, extlen, &extbytes)
301 || i2d_X509_EXTENSIONS(s->ext.ocsp.exts, &extbytes)
303 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_STATUS_REQUEST,
304 ERR_R_INTERNAL_ERROR);
308 if (!WPACKET_close(pkt) || !WPACKET_close(pkt)) {
309 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_STATUS_REQUEST, ERR_R_INTERNAL_ERROR);
317 #ifndef OPENSSL_NO_NEXTPROTONEG
318 int tls_construct_ctos_npn(SSL *s, WPACKET *pkt, X509 *x, size_t chainidx,
321 if (s->ctx->ext.npn_select_cb == NULL || !SSL_IS_FIRST_HANDSHAKE(s))
325 * The client advertises an empty extension to indicate its support
326 * for Next Protocol Negotiation
328 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_next_proto_neg)
329 || !WPACKET_put_bytes_u16(pkt, 0)) {
330 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_NPN, ERR_R_INTERNAL_ERROR);
338 int tls_construct_ctos_alpn(SSL *s, WPACKET *pkt, X509 *x, size_t chainidx,
341 s->s3->alpn_sent = 0;
343 if (s->ext.alpn == NULL || !SSL_IS_FIRST_HANDSHAKE(s))
346 if (!WPACKET_put_bytes_u16(pkt,
347 TLSEXT_TYPE_application_layer_protocol_negotiation)
348 /* Sub-packet ALPN extension */
349 || !WPACKET_start_sub_packet_u16(pkt)
350 || !WPACKET_sub_memcpy_u16(pkt, s->ext.alpn, s->ext.alpn_len)
351 || !WPACKET_close(pkt)) {
352 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_ALPN, ERR_R_INTERNAL_ERROR);
355 s->s3->alpn_sent = 1;
361 #ifndef OPENSSL_NO_SRTP
362 int tls_construct_ctos_use_srtp(SSL *s, WPACKET *pkt, X509 *x, size_t chainidx,
365 STACK_OF(SRTP_PROTECTION_PROFILE) *clnt = SSL_get_srtp_profiles(s);
371 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_use_srtp)
372 /* Sub-packet for SRTP extension */
373 || !WPACKET_start_sub_packet_u16(pkt)
374 /* Sub-packet for the protection profile list */
375 || !WPACKET_start_sub_packet_u16(pkt)) {
376 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_USE_SRTP, ERR_R_INTERNAL_ERROR);
380 end = sk_SRTP_PROTECTION_PROFILE_num(clnt);
381 for (i = 0; i < end; i++) {
382 const SRTP_PROTECTION_PROFILE *prof =
383 sk_SRTP_PROTECTION_PROFILE_value(clnt, i);
385 if (prof == NULL || !WPACKET_put_bytes_u16(pkt, prof->id)) {
386 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_USE_SRTP, ERR_R_INTERNAL_ERROR);
390 if (!WPACKET_close(pkt)
391 /* Add an empty use_mki value */
392 || !WPACKET_put_bytes_u8(pkt, 0)
393 || !WPACKET_close(pkt)) {
394 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_USE_SRTP, ERR_R_INTERNAL_ERROR);
402 int tls_construct_ctos_etm(SSL *s, WPACKET *pkt, X509 *x, size_t chainidx,
405 if (s->options & SSL_OP_NO_ENCRYPT_THEN_MAC)
408 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_encrypt_then_mac)
409 || !WPACKET_put_bytes_u16(pkt, 0)) {
410 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_ETM, ERR_R_INTERNAL_ERROR);
417 #ifndef OPENSSL_NO_CT
418 int tls_construct_ctos_sct(SSL *s, WPACKET *pkt, X509 *x, size_t chainidx,
421 if (s->ct_validation_callback == NULL)
424 /* Not defined for client Certificates */
428 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_signed_certificate_timestamp)
429 || !WPACKET_put_bytes_u16(pkt, 0)) {
430 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SCT, ERR_R_INTERNAL_ERROR);
438 int tls_construct_ctos_ems(SSL *s, WPACKET *pkt, X509 *x, size_t chainidx,
441 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_extended_master_secret)
442 || !WPACKET_put_bytes_u16(pkt, 0)) {
443 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_EMS, ERR_R_INTERNAL_ERROR);
450 int tls_construct_ctos_supported_versions(SSL *s, WPACKET *pkt, X509 *x,
451 size_t chainidx, int *al)
453 int currv, min_version, max_version, reason;
455 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_supported_versions)
456 || !WPACKET_start_sub_packet_u16(pkt)
457 || !WPACKET_start_sub_packet_u8(pkt)) {
458 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_VERSIONS,
459 ERR_R_INTERNAL_ERROR);
463 reason = ssl_get_client_min_max_version(s, &min_version, &max_version);
465 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_VERSIONS, reason);
470 * TODO(TLS1.3): There is some discussion on the TLS list as to wheter
471 * we should include versions <TLS1.2. For the moment we do. To be
474 for (currv = max_version; currv >= min_version; currv--) {
475 /* TODO(TLS1.3): Remove this first if clause prior to release!! */
476 if (currv == TLS1_3_VERSION) {
477 if (!WPACKET_put_bytes_u16(pkt, TLS1_3_VERSION_DRAFT)) {
478 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_VERSIONS,
479 ERR_R_INTERNAL_ERROR);
482 } else if (!WPACKET_put_bytes_u16(pkt, currv)) {
483 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_VERSIONS,
484 ERR_R_INTERNAL_ERROR);
488 if (!WPACKET_close(pkt) || !WPACKET_close(pkt)) {
489 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_VERSIONS,
490 ERR_R_INTERNAL_ERROR);
498 * Construct a psk_kex_modes extension. We only have two modes we know about
499 * at this stage, so we send both.
501 int tls_construct_ctos_psk_kex_modes(SSL *s, WPACKET *pkt, X509 *x,
502 size_t chainidx, int *al)
504 #ifndef OPENSSL_NO_TLS1_3
506 * TODO(TLS1.3): Do we want this list to be configurable? For now we always
507 * just send both supported modes
509 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_psk_kex_modes)
510 || !WPACKET_start_sub_packet_u16(pkt)
511 || !WPACKET_start_sub_packet_u8(pkt)
512 || !WPACKET_put_bytes_u8(pkt, TLSEXT_KEX_MODE_KE_DHE)
513 || !WPACKET_put_bytes_u8(pkt, TLSEXT_KEX_MODE_KE)
514 || !WPACKET_close(pkt)
515 || !WPACKET_close(pkt)) {
516 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_PSK_KEX_MODES, ERR_R_INTERNAL_ERROR);
520 s->ext.psk_kex_mode = TLSEXT_KEX_MODE_FLAG_KE | TLSEXT_KEX_MODE_FLAG_KE_DHE;
526 int tls_construct_ctos_key_share(SSL *s, WPACKET *pkt, X509 *x, size_t chainidx,
529 #ifndef OPENSSL_NO_TLS1_3
530 size_t i, sharessent = 0, num_curves = 0;
531 const unsigned char *pcurves = NULL;
533 /* key_share extension */
534 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_key_share)
535 /* Extension data sub-packet */
536 || !WPACKET_start_sub_packet_u16(pkt)
537 /* KeyShare list sub-packet */
538 || !WPACKET_start_sub_packet_u16(pkt)) {
539 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_KEY_SHARE, ERR_R_INTERNAL_ERROR);
543 pcurves = s->ext.supportedgroups;
544 if (!tls1_get_curvelist(s, 0, &pcurves, &num_curves)) {
545 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_KEY_SHARE, ERR_R_INTERNAL_ERROR);
550 * TODO(TLS1.3): Make the number of key_shares sent configurable. For
553 for (i = 0; i < num_curves && sharessent < 1; i++, pcurves += 2) {
554 unsigned char *encodedPoint = NULL;
555 unsigned int curve_id = 0;
556 EVP_PKEY *key_share_key = NULL;
559 if (!tls_curve_allowed(s, pcurves, SSL_SECOP_CURVE_SUPPORTED))
562 if (s->s3->tmp.pkey != NULL) {
563 /* Shouldn't happen! */
564 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_KEY_SHARE, ERR_R_INTERNAL_ERROR);
568 /* Generate a key for this key_share */
569 curve_id = (pcurves[0] << 8) | pcurves[1];
570 key_share_key = ssl_generate_pkey_curve(curve_id);
571 if (key_share_key == NULL) {
572 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_KEY_SHARE, ERR_R_EVP_LIB);
576 /* Encode the public key. */
577 encodedlen = EVP_PKEY_get1_tls_encodedpoint(key_share_key,
579 if (encodedlen == 0) {
580 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_KEY_SHARE, ERR_R_EC_LIB);
581 EVP_PKEY_free(key_share_key);
585 /* Create KeyShareEntry */
586 if (!WPACKET_put_bytes_u16(pkt, curve_id)
587 || !WPACKET_sub_memcpy_u16(pkt, encodedPoint, encodedlen)) {
588 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_KEY_SHARE, ERR_R_INTERNAL_ERROR);
589 EVP_PKEY_free(key_share_key);
590 OPENSSL_free(encodedPoint);
595 * TODO(TLS1.3): When changing to send more than one key_share we're
596 * going to need to be able to save more than one EVP_PKEY. For now
597 * we reuse the existing tmp.pkey
599 s->s3->group_id = curve_id;
600 s->s3->tmp.pkey = key_share_key;
602 OPENSSL_free(encodedPoint);
605 if (!WPACKET_close(pkt) || !WPACKET_close(pkt)) {
606 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_KEY_SHARE, ERR_R_INTERNAL_ERROR);
614 #define F5_WORKAROUND_MIN_MSG_LEN 0xff
615 #define F5_WORKAROUND_MAX_MSG_LEN 0x200
617 int tls_construct_ctos_padding(SSL *s, WPACKET *pkt, X509 *x, size_t chainidx,
620 unsigned char *padbytes;
623 if ((s->options & SSL_OP_TLSEXT_PADDING) == 0)
627 * Add padding to workaround bugs in F5 terminators. See
628 * https://tools.ietf.org/html/draft-agl-tls-padding-03 NB: because this
629 * code calculates the length of all existing extensions it MUST always
632 if (!WPACKET_get_total_written(pkt, &hlen)) {
633 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_PADDING, ERR_R_INTERNAL_ERROR);
637 if (hlen > F5_WORKAROUND_MIN_MSG_LEN && hlen < F5_WORKAROUND_MAX_MSG_LEN) {
638 /* Calculate the amond of padding we need to add */
639 hlen = F5_WORKAROUND_MAX_MSG_LEN - hlen;
642 * Take off the size of extension header itself (2 bytes for type and
643 * 2 bytes for length bytes)
650 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_padding)
651 || !WPACKET_sub_allocate_bytes_u16(pkt, hlen, &padbytes)) {
652 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_PADDING, ERR_R_INTERNAL_ERROR);
655 memset(padbytes, 0, hlen);
662 * Construct the pre_shared_key extension
664 int tls_construct_ctos_psk(SSL *s, WPACKET *pkt, X509 *x, size_t chainidx,
667 #ifndef OPENSSL_NO_TLS1_3
668 uint32_t now, ages, agems;
669 size_t hashsize, binderoffset, msglen;
670 unsigned char *binder = NULL, *msgstart = NULL;
674 s->session->ext.tick_identity = TLSEXT_PSK_BAD_IDENTITY;
677 * If this is a new session then we have nothing to resume so don't add
680 if (s->session->ext.ticklen == 0)
684 * Technically the C standard just says time() returns a time_t and says
685 * nothing about the encoding of that type. In practice most implementations
686 * follow POSIX which holds it as an integral type in seconds since epoch.
687 * We've already made the assumption that we can do this in multiple places
688 * in the code, so portability shouldn't be an issue.
690 now = (uint32_t)time(NULL);
691 ages = now - (uint32_t)s->session->time;
693 if (s->session->ext.tick_lifetime_hint < ages) {
694 /* Ticket is too old. Ignore it. */
699 * Calculate age in ms. We're just doing it to nearest second. Should be
702 agems = ages * (uint32_t)1000;
704 if (ages != 0 && agems / (uint32_t)1000 != ages) {
706 * Overflow. Shouldn't happen unless this is a *really* old session. If
707 * so we just ignore it.
713 * Obfuscate the age. Overflow here is fine, this addition is supposed to
716 agems += s->session->ext.tick_age_add;
718 md = ssl_cipher_get_handshake_md(s->session->cipher_id);
720 /* Don't recognise this cipher so we can't use the session. Ignore it */
724 hashsize = EVP_MD_size(md);
726 /* Create the extension, but skip over the binder for now */
727 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_psk)
728 || !WPACKET_start_sub_packet_u16(pkt)
729 || !WPACKET_start_sub_packet_u16(pkt)
730 || !WPACKET_sub_memcpy_u16(pkt, s->session->ext.tick,
731 s->session->ext.ticklen)
732 || !WPACKET_put_bytes_u32(pkt, agems)
733 || !WPACKET_close(pkt)
734 || !WPACKET_get_total_written(pkt, &binderoffset)
735 || !WPACKET_start_sub_packet_u16(pkt)
736 || !WPACKET_sub_allocate_bytes_u8(pkt, hashsize, &binder)
737 || !WPACKET_close(pkt)
738 || !WPACKET_close(pkt)
739 || !WPACKET_get_total_written(pkt, &msglen)
741 * We need to fill in all the sub-packet lengths now so we can
742 * calculate the HMAC of the message up to the binders
744 || !WPACKET_fill_lengths(pkt)) {
745 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_PSK, ERR_R_INTERNAL_ERROR);
749 msgstart = WPACKET_get_curr(pkt) - msglen;
751 if (tls_psk_do_binder(s, md, msgstart, binderoffset, NULL, binder,
752 s->session, 1) != 1) {
753 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_PSK, ERR_R_INTERNAL_ERROR);
757 s->session->ext.tick_identity = 0;
768 * Parse the server's renegotiation binding and abort if it's not right
770 int tls_parse_stoc_renegotiate(SSL *s, PACKET *pkt, X509 *x, size_t chainidx,
773 size_t expected_len = s->s3->previous_client_finished_len
774 + s->s3->previous_server_finished_len;
776 const unsigned char *data;
778 /* Check for logic errors */
779 assert(expected_len == 0 || s->s3->previous_client_finished_len != 0);
780 assert(expected_len == 0 || s->s3->previous_server_finished_len != 0);
782 /* Parse the length byte */
783 if (!PACKET_get_1_len(pkt, &ilen)) {
784 SSLerr(SSL_F_TLS_PARSE_STOC_RENEGOTIATE,
785 SSL_R_RENEGOTIATION_ENCODING_ERR);
786 *al = SSL_AD_ILLEGAL_PARAMETER;
790 /* Consistency check */
791 if (PACKET_remaining(pkt) != ilen) {
792 SSLerr(SSL_F_TLS_PARSE_STOC_RENEGOTIATE,
793 SSL_R_RENEGOTIATION_ENCODING_ERR);
794 *al = SSL_AD_ILLEGAL_PARAMETER;
798 /* Check that the extension matches */
799 if (ilen != expected_len) {
800 SSLerr(SSL_F_TLS_PARSE_STOC_RENEGOTIATE,
801 SSL_R_RENEGOTIATION_MISMATCH);
802 *al = SSL_AD_HANDSHAKE_FAILURE;
806 if (!PACKET_get_bytes(pkt, &data, s->s3->previous_client_finished_len)
807 || memcmp(data, s->s3->previous_client_finished,
808 s->s3->previous_client_finished_len) != 0) {
809 SSLerr(SSL_F_TLS_PARSE_STOC_RENEGOTIATE,
810 SSL_R_RENEGOTIATION_MISMATCH);
811 *al = SSL_AD_HANDSHAKE_FAILURE;
815 if (!PACKET_get_bytes(pkt, &data, s->s3->previous_server_finished_len)
816 || memcmp(data, s->s3->previous_server_finished,
817 s->s3->previous_server_finished_len) != 0) {
818 SSLerr(SSL_F_TLS_PARSE_STOC_RENEGOTIATE,
819 SSL_R_RENEGOTIATION_MISMATCH);
820 *al = SSL_AD_ILLEGAL_PARAMETER;
823 s->s3->send_connection_binding = 1;
828 int tls_parse_stoc_server_name(SSL *s, PACKET *pkt, X509 *x, size_t chainidx,
831 if (s->ext.hostname == NULL || PACKET_remaining(pkt) > 0) {
832 *al = SSL_AD_UNRECOGNIZED_NAME;
837 if (s->session->ext.hostname != NULL) {
838 *al = SSL_AD_INTERNAL_ERROR;
841 s->session->ext.hostname = OPENSSL_strdup(s->ext.hostname);
842 if (s->session->ext.hostname == NULL) {
843 *al = SSL_AD_INTERNAL_ERROR;
851 #ifndef OPENSSL_NO_EC
852 int tls_parse_stoc_ec_pt_formats(SSL *s, PACKET *pkt, X509 *x, size_t chainidx,
855 unsigned int ecpointformats_len;
856 PACKET ecptformatlist;
858 if (!PACKET_as_length_prefixed_1(pkt, &ecptformatlist)) {
859 *al = SSL_AD_DECODE_ERROR;
863 ecpointformats_len = PACKET_remaining(&ecptformatlist);
864 s->session->ext.ecpointformats_len = 0;
866 OPENSSL_free(s->session->ext.ecpointformats);
867 s->session->ext.ecpointformats = OPENSSL_malloc(ecpointformats_len);
868 if (s->session->ext.ecpointformats == NULL) {
869 *al = SSL_AD_INTERNAL_ERROR;
873 s->session->ext.ecpointformats_len = ecpointformats_len;
875 if (!PACKET_copy_bytes(&ecptformatlist,
876 s->session->ext.ecpointformats,
877 ecpointformats_len)) {
878 *al = SSL_AD_INTERNAL_ERROR;
887 int tls_parse_stoc_session_ticket(SSL *s, PACKET *pkt, X509 *x, size_t chainidx,
890 if (s->ext.session_ticket_cb != NULL &&
891 !s->ext.session_ticket_cb(s, PACKET_data(pkt),
892 PACKET_remaining(pkt),
893 s->ext.session_ticket_cb_arg)) {
894 *al = SSL_AD_INTERNAL_ERROR;
898 if (!tls_use_ticket(s) || PACKET_remaining(pkt) > 0) {
899 *al = SSL_AD_UNSUPPORTED_EXTENSION;
903 s->ext.ticket_expected = 1;
908 #ifndef OPENSSL_NO_OCSP
909 int tls_parse_stoc_status_request(SSL *s, PACKET *pkt, X509 *x, size_t chainidx,
913 * MUST only be sent if we've requested a status
914 * request message. In TLS <= 1.2 it must also be empty.
916 if (s->ext.status_type == TLSEXT_STATUSTYPE_nothing
917 || (!SSL_IS_TLS13(s) && PACKET_remaining(pkt) > 0)) {
918 *al = SSL_AD_UNSUPPORTED_EXTENSION;
922 if (SSL_IS_TLS13(s)) {
923 /* We only know how to handle this if it's for the first Certificate in
924 * the chain. We ignore any other repsonses.
928 return tls_process_cert_status_body(s, pkt, al);
931 /* Set flag to expect CertificateStatus message */
932 s->ext.status_expected = 1;
939 #ifndef OPENSSL_NO_CT
940 int tls_parse_stoc_sct(SSL *s, PACKET *pkt, X509 *x, size_t chainidx, int *al)
943 * Only take it if we asked for it - i.e if there is no CT validation
944 * callback set, then a custom extension MAY be processing it, so we
945 * need to let control continue to flow to that.
947 if (s->ct_validation_callback != NULL) {
948 size_t size = PACKET_remaining(pkt);
950 /* Simply copy it off for later processing */
951 OPENSSL_free(s->ext.scts);
954 s->ext.scts_len = size;
956 s->ext.scts = OPENSSL_malloc(size);
957 if (s->ext.scts == NULL
958 || !PACKET_copy_bytes(pkt, s->ext.scts, size)) {
959 *al = SSL_AD_INTERNAL_ERROR;
964 if (custom_ext_parse(s, 0, TLSEXT_TYPE_signed_certificate_timestamp,
965 PACKET_data(pkt), PACKET_remaining(pkt), al) <= 0)
974 #ifndef OPENSSL_NO_NEXTPROTONEG
976 * ssl_next_proto_validate validates a Next Protocol Negotiation block. No
977 * elements of zero length are allowed and the set of elements must exactly
978 * fill the length of the block. Returns 1 on success or 0 on failure.
980 static int ssl_next_proto_validate(PACKET *pkt)
984 while (PACKET_remaining(pkt)) {
985 if (!PACKET_get_length_prefixed_1(pkt, &tmp_protocol)
986 || PACKET_remaining(&tmp_protocol) == 0)
993 int tls_parse_stoc_npn(SSL *s, PACKET *pkt, X509 *x, size_t chainidx, int *al)
995 unsigned char *selected;
996 unsigned char selected_len;
999 /* Check if we are in a renegotiation. If so ignore this extension */
1000 if (!SSL_IS_FIRST_HANDSHAKE(s))
1003 /* We must have requested it. */
1004 if (s->ctx->ext.npn_select_cb == NULL) {
1005 *al = SSL_AD_UNSUPPORTED_EXTENSION;
1009 /* The data must be valid */
1011 if (!ssl_next_proto_validate(&tmppkt)) {
1012 *al = SSL_AD_DECODE_ERROR;
1015 if (s->ctx->ext.npn_select_cb(s, &selected, &selected_len,
1017 PACKET_remaining(pkt),
1018 s->ctx->ext.npn_select_cb_arg) !=
1019 SSL_TLSEXT_ERR_OK) {
1020 *al = SSL_AD_INTERNAL_ERROR;
1025 * Could be non-NULL if server has sent multiple NPN extensions in
1026 * a single Serverhello
1028 OPENSSL_free(s->ext.npn);
1029 s->ext.npn = OPENSSL_malloc(selected_len);
1030 if (s->ext.npn == NULL) {
1031 *al = SSL_AD_INTERNAL_ERROR;
1035 memcpy(s->ext.npn, selected, selected_len);
1036 s->ext.npn_len = selected_len;
1037 s->s3->npn_seen = 1;
1043 int tls_parse_stoc_alpn(SSL *s, PACKET *pkt, X509 *x, size_t chainidx, int *al)
1047 /* We must have requested it. */
1048 if (!s->s3->alpn_sent) {
1049 *al = SSL_AD_UNSUPPORTED_EXTENSION;
1053 * The extension data consists of:
1054 * uint16 list_length
1055 * uint8 proto_length;
1056 * uint8 proto[proto_length];
1058 if (!PACKET_get_net_2_len(pkt, &len)
1059 || PACKET_remaining(pkt) != len || !PACKET_get_1_len(pkt, &len)
1060 || PACKET_remaining(pkt) != len) {
1061 *al = SSL_AD_DECODE_ERROR;
1064 OPENSSL_free(s->s3->alpn_selected);
1065 s->s3->alpn_selected = OPENSSL_malloc(len);
1066 if (s->s3->alpn_selected == NULL) {
1067 *al = SSL_AD_INTERNAL_ERROR;
1070 if (!PACKET_copy_bytes(pkt, s->s3->alpn_selected, len)) {
1071 *al = SSL_AD_DECODE_ERROR;
1074 s->s3->alpn_selected_len = len;
1079 #ifndef OPENSSL_NO_SRTP
1080 int tls_parse_stoc_use_srtp(SSL *s, PACKET *pkt, X509 *x, size_t chainidx,
1083 unsigned int id, ct, mki;
1085 STACK_OF(SRTP_PROTECTION_PROFILE) *clnt;
1086 SRTP_PROTECTION_PROFILE *prof;
1088 if (!PACKET_get_net_2(pkt, &ct) || ct != 2
1089 || !PACKET_get_net_2(pkt, &id)
1090 || !PACKET_get_1(pkt, &mki)
1091 || PACKET_remaining(pkt) != 0) {
1092 SSLerr(SSL_F_TLS_PARSE_STOC_USE_SRTP,
1093 SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST);
1094 *al = SSL_AD_DECODE_ERROR;
1099 /* Must be no MKI, since we never offer one */
1100 SSLerr(SSL_F_TLS_PARSE_STOC_USE_SRTP, SSL_R_BAD_SRTP_MKI_VALUE);
1101 *al = SSL_AD_ILLEGAL_PARAMETER;
1105 /* Throw an error if the server gave us an unsolicited extension */
1106 clnt = SSL_get_srtp_profiles(s);
1108 SSLerr(SSL_F_TLS_PARSE_STOC_USE_SRTP, SSL_R_NO_SRTP_PROFILES);
1109 *al = SSL_AD_DECODE_ERROR;
1114 * Check to see if the server gave us something we support (and
1115 * presumably offered)
1117 for (i = 0; i < sk_SRTP_PROTECTION_PROFILE_num(clnt); i++) {
1118 prof = sk_SRTP_PROTECTION_PROFILE_value(clnt, i);
1120 if (prof->id == id) {
1121 s->srtp_profile = prof;
1127 SSLerr(SSL_F_TLS_PARSE_STOC_USE_SRTP,
1128 SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST);
1129 *al = SSL_AD_DECODE_ERROR;
1134 int tls_parse_stoc_etm(SSL *s, PACKET *pkt, X509 *x, size_t chainidx, int *al)
1136 /* Ignore if inappropriate ciphersuite */
1137 if (!(s->options & SSL_OP_NO_ENCRYPT_THEN_MAC)
1138 && s->s3->tmp.new_cipher->algorithm_mac != SSL_AEAD
1139 && s->s3->tmp.new_cipher->algorithm_enc != SSL_RC4)
1140 s->s3->flags |= TLS1_FLAGS_ENCRYPT_THEN_MAC;
1145 int tls_parse_stoc_ems(SSL *s, PACKET *pkt, X509 *x, size_t chainidx, int *al)
1147 s->s3->flags |= TLS1_FLAGS_RECEIVED_EXTMS;
1149 s->session->flags |= SSL_SESS_FLAG_EXTMS;
1154 int tls_parse_stoc_key_share(SSL *s, PACKET *pkt, X509 *x, size_t chainidx,
1157 #ifndef OPENSSL_NO_TLS1_3
1158 unsigned int group_id;
1160 EVP_PKEY *ckey = s->s3->tmp.pkey, *skey = NULL;
1164 *al = SSL_AD_INTERNAL_ERROR;
1165 SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE, ERR_R_INTERNAL_ERROR);
1169 if (!PACKET_get_net_2(pkt, &group_id)) {
1170 *al = SSL_AD_HANDSHAKE_FAILURE;
1171 SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE, SSL_R_LENGTH_MISMATCH);
1175 if (group_id != s->s3->group_id) {
1177 * This isn't for the group that we sent in the original
1180 *al = SSL_AD_HANDSHAKE_FAILURE;
1181 SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE, SSL_R_BAD_KEY_SHARE);
1185 if (!PACKET_as_length_prefixed_2(pkt, &encoded_pt)
1186 || PACKET_remaining(&encoded_pt) == 0) {
1187 *al = SSL_AD_DECODE_ERROR;
1188 SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE, SSL_R_LENGTH_MISMATCH);
1192 skey = ssl_generate_pkey(ckey);
1194 *al = SSL_AD_INTERNAL_ERROR;
1195 SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE, ERR_R_MALLOC_FAILURE);
1198 if (!EVP_PKEY_set1_tls_encodedpoint(skey, PACKET_data(&encoded_pt),
1199 PACKET_remaining(&encoded_pt))) {
1200 *al = SSL_AD_DECODE_ERROR;
1201 SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE, SSL_R_BAD_ECPOINT);
1202 EVP_PKEY_free(skey);
1206 if (ssl_derive(s, ckey, skey, 1) == 0) {
1207 *al = SSL_AD_INTERNAL_ERROR;
1208 SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE, ERR_R_INTERNAL_ERROR);
1209 EVP_PKEY_free(skey);
1212 EVP_PKEY_free(skey);
1218 int tls_parse_stoc_psk(SSL *s, PACKET *pkt, X509 *x, size_t chainidx, int *al)
1220 #ifndef OPENSSL_NO_TLS1_3
1221 unsigned int identity;
1223 if (!PACKET_get_net_2(pkt, &identity) || PACKET_remaining(pkt) != 0) {
1224 *al = SSL_AD_HANDSHAKE_FAILURE;
1225 SSLerr(SSL_F_TLS_PARSE_STOC_PSK, SSL_R_LENGTH_MISMATCH);
1229 if (s->session->ext.tick_identity != (int)identity) {
1230 *al = SSL_AD_HANDSHAKE_FAILURE;
1231 SSLerr(SSL_F_TLS_PARSE_STOC_PSK, SSL_R_BAD_PSK_IDENTITY);