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);
524 int tls_construct_ctos_key_share(SSL *s, WPACKET *pkt, X509 *x, size_t chainidx,
527 #ifndef OPENSSL_NO_TLS1_3
528 size_t i, sharessent = 0, num_curves = 0;
529 const unsigned char *pcurves = NULL;
531 /* key_share extension */
532 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_key_share)
533 /* Extension data sub-packet */
534 || !WPACKET_start_sub_packet_u16(pkt)
535 /* KeyShare list sub-packet */
536 || !WPACKET_start_sub_packet_u16(pkt)) {
537 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_KEY_SHARE, ERR_R_INTERNAL_ERROR);
541 pcurves = s->ext.supportedgroups;
542 if (!tls1_get_curvelist(s, 0, &pcurves, &num_curves)) {
543 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_KEY_SHARE, ERR_R_INTERNAL_ERROR);
548 * TODO(TLS1.3): Make the number of key_shares sent configurable. For
551 for (i = 0; i < num_curves && sharessent < 1; i++, pcurves += 2) {
552 unsigned char *encodedPoint = NULL;
553 unsigned int curve_id = 0;
554 EVP_PKEY *key_share_key = NULL;
557 if (!tls_curve_allowed(s, pcurves, SSL_SECOP_CURVE_SUPPORTED))
560 if (s->s3->tmp.pkey != NULL) {
561 /* Shouldn't happen! */
562 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_KEY_SHARE, ERR_R_INTERNAL_ERROR);
566 /* Generate a key for this key_share */
567 curve_id = (pcurves[0] << 8) | pcurves[1];
568 key_share_key = ssl_generate_pkey_curve(curve_id);
569 if (key_share_key == NULL) {
570 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_KEY_SHARE, ERR_R_EVP_LIB);
574 /* Encode the public key. */
575 encodedlen = EVP_PKEY_get1_tls_encodedpoint(key_share_key,
577 if (encodedlen == 0) {
578 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_KEY_SHARE, ERR_R_EC_LIB);
579 EVP_PKEY_free(key_share_key);
583 /* Create KeyShareEntry */
584 if (!WPACKET_put_bytes_u16(pkt, curve_id)
585 || !WPACKET_sub_memcpy_u16(pkt, encodedPoint, encodedlen)) {
586 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_KEY_SHARE, ERR_R_INTERNAL_ERROR);
587 EVP_PKEY_free(key_share_key);
588 OPENSSL_free(encodedPoint);
593 * TODO(TLS1.3): When changing to send more than one key_share we're
594 * going to need to be able to save more than one EVP_PKEY. For now
595 * we reuse the existing tmp.pkey
597 s->s3->group_id = curve_id;
598 s->s3->tmp.pkey = key_share_key;
600 OPENSSL_free(encodedPoint);
603 if (!WPACKET_close(pkt) || !WPACKET_close(pkt)) {
604 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_KEY_SHARE, ERR_R_INTERNAL_ERROR);
612 #define F5_WORKAROUND_MIN_MSG_LEN 0xff
613 #define F5_WORKAROUND_MAX_MSG_LEN 0x200
615 int tls_construct_ctos_padding(SSL *s, WPACKET *pkt, X509 *x, size_t chainidx,
618 unsigned char *padbytes;
621 if ((s->options & SSL_OP_TLSEXT_PADDING) == 0)
625 * Add padding to workaround bugs in F5 terminators. See
626 * https://tools.ietf.org/html/draft-agl-tls-padding-03 NB: because this
627 * code calculates the length of all existing extensions it MUST always
630 if (!WPACKET_get_total_written(pkt, &hlen)) {
631 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_PADDING, ERR_R_INTERNAL_ERROR);
635 if (hlen > F5_WORKAROUND_MIN_MSG_LEN && hlen < F5_WORKAROUND_MAX_MSG_LEN) {
636 /* Calculate the amond of padding we need to add */
637 hlen = F5_WORKAROUND_MAX_MSG_LEN - hlen;
640 * Take off the size of extension header itself (2 bytes for type and
641 * 2 bytes for length bytes)
648 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_padding)
649 || !WPACKET_sub_allocate_bytes_u16(pkt, hlen, &padbytes)) {
650 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_PADDING, ERR_R_INTERNAL_ERROR);
653 memset(padbytes, 0, hlen);
660 * Construct the pre_shared_key extension
662 int tls_construct_ctos_psk(SSL *s, WPACKET *pkt, X509 *x, size_t chainidx,
665 #ifndef OPENSSL_NO_TLS1_3
666 const SSL_CIPHER *cipher;
667 uint32_t now, ages, agems;
668 size_t hashsize, bindersize, binderoffset, msglen;
669 unsigned char *binder = NULL, *msgstart = NULL;
670 EVP_PKEY *mackey = NULL;
672 EVP_MD_CTX *mctx = NULL;
673 unsigned char hash[EVP_MAX_MD_SIZE], binderkey[EVP_MAX_MD_SIZE];
674 unsigned char finishedkey[EVP_MAX_MD_SIZE];
675 const char resumption_label[] = "resumption psk binder key";
678 s->session->ext.tick_identity = TLSEXT_PSK_BAD_IDENTITY;
681 * If this is a new session then we have nothing to resume so don't add
684 if (s->session->ext.ticklen == 0)
688 * Technically the C standard just says time() returns a time_t and says
689 * nothing about the encoding of that type. In practice most implementations
690 * follow POSIX which holds it as an integral type in seconds since epoch.
691 * We've already made the assumption that we can do this in multiple places
692 * in the code, so portability shouldn't be an issue.
694 now = (uint32_t)time(NULL);
695 ages = now - (uint32_t)s->session->time;
697 if (s->session->ext.tick_lifetime_hint < ages) {
698 /* Ticket is too old. Ignore it. */
703 * Calculate age in ms. We're just doing it to nearest second. Should be
706 agems = ages * (uint32_t)1000;
708 if (ages != 0 && agems / (uint32_t)1000 != ages) {
710 * Overflow. Shouldn't happen unless this is a *really* old session. If
711 * so we just ignore it.
717 * Obfuscate the age. Overflow here is fine, this addition is supposed to
720 agems += s->session->ext.tick_age_add;
722 cipher = ssl3_get_cipher_by_id(s->session->cipher_id);
723 if (cipher == NULL) {
724 /* Don't recognise this cipher so we can't use the session. Ignore it */
727 md = ssl_md(cipher->algorithm2);
729 /* Shouldn't happen!! */
730 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_PSK, ERR_R_INTERNAL_ERROR);
733 hashsize = EVP_MD_size(md);
735 /* Create the extension, but skip over the binder for now */
736 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_psk)
737 || !WPACKET_start_sub_packet_u16(pkt)
738 || !WPACKET_start_sub_packet_u16(pkt)
739 || !WPACKET_sub_memcpy_u16(pkt, s->session->ext.tick,
740 s->session->ext.ticklen)
741 || !WPACKET_put_bytes_u32(pkt, agems)
742 || !WPACKET_close(pkt)
743 || !WPACKET_get_total_written(pkt, &binderoffset)
744 || !WPACKET_start_sub_packet_u16(pkt)
745 || !WPACKET_sub_allocate_bytes_u8(pkt, hashsize, &binder)
746 || !WPACKET_close(pkt)
747 || !WPACKET_close(pkt)
748 || !WPACKET_get_total_written(pkt, &msglen)
750 * We need to fill in all the sub-packet lengths now so we can
751 * calculate the HMAC of the message up to the binders
753 || !WPACKET_fill_lengths(pkt)) {
754 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_PSK, ERR_R_INTERNAL_ERROR);
758 msgstart = WPACKET_get_curr(pkt) - msglen;
760 /* Generate the early_secret */
761 if (!tls13_generate_secret(s, md, NULL, s->session->master_key,
762 s->session->master_key_length,
763 (unsigned char *)&s->early_secret)) {
764 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_PSK, ERR_R_INTERNAL_ERROR);
769 * Create the handshake hash for the binder key...the messages so far are
772 mctx = EVP_MD_CTX_new();
774 || EVP_DigestInit_ex(mctx, md, NULL) <= 0
775 || EVP_DigestFinal_ex(mctx, hash, NULL) <= 0) {
776 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_PSK, ERR_R_INTERNAL_ERROR);
780 /* Generate the binder key */
781 if (!tls13_hkdf_expand(s, md, s->early_secret,
782 (unsigned char *)resumption_label,
783 sizeof(resumption_label) - 1, hash, binderkey,
785 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_PSK, ERR_R_INTERNAL_ERROR);
789 /* Generate the finished key */
790 if (!tls13_derive_finishedkey(s, md, binderkey, finishedkey, hashsize)) {
791 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_PSK, ERR_R_INTERNAL_ERROR);
796 * Get a hash of the ClientHello up to the start of the binders.
797 * TODO(TLS1.3): This will need to be tweaked when we implement
798 * HelloRetryRequest to include the digest of the previous messages here.
800 if (EVP_DigestInit_ex(mctx, md, NULL) <= 0
801 || EVP_DigestUpdate(mctx, msgstart, binderoffset) <= 0
802 || EVP_DigestFinal_ex(mctx, hash, NULL) <= 0) {
803 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_PSK, ERR_R_INTERNAL_ERROR);
807 mackey = EVP_PKEY_new_mac_key(EVP_PKEY_HMAC, NULL, finishedkey, hashsize);
808 bindersize = hashsize;
809 if (binderkey == NULL
810 || EVP_DigestSignInit(mctx, NULL, md, NULL, mackey) <= 0
811 || EVP_DigestSignUpdate(mctx, hash, hashsize) <= 0
812 || EVP_DigestSignFinal(mctx, binder, &bindersize) <= 0
813 || bindersize != hashsize) {
814 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_PSK, ERR_R_INTERNAL_ERROR);
818 s->session->ext.tick_identity = 0;
822 OPENSSL_cleanse(binderkey, sizeof(binderkey));
823 OPENSSL_cleanse(finishedkey, sizeof(finishedkey));
824 EVP_PKEY_free(mackey);
825 EVP_MD_CTX_free(mctx);
834 * Parse the server's renegotiation binding and abort if it's not right
836 int tls_parse_stoc_renegotiate(SSL *s, PACKET *pkt, X509 *x, size_t chainidx,
839 size_t expected_len = s->s3->previous_client_finished_len
840 + s->s3->previous_server_finished_len;
842 const unsigned char *data;
844 /* Check for logic errors */
845 assert(expected_len == 0 || s->s3->previous_client_finished_len != 0);
846 assert(expected_len == 0 || s->s3->previous_server_finished_len != 0);
848 /* Parse the length byte */
849 if (!PACKET_get_1_len(pkt, &ilen)) {
850 SSLerr(SSL_F_TLS_PARSE_STOC_RENEGOTIATE,
851 SSL_R_RENEGOTIATION_ENCODING_ERR);
852 *al = SSL_AD_ILLEGAL_PARAMETER;
856 /* Consistency check */
857 if (PACKET_remaining(pkt) != ilen) {
858 SSLerr(SSL_F_TLS_PARSE_STOC_RENEGOTIATE,
859 SSL_R_RENEGOTIATION_ENCODING_ERR);
860 *al = SSL_AD_ILLEGAL_PARAMETER;
864 /* Check that the extension matches */
865 if (ilen != expected_len) {
866 SSLerr(SSL_F_TLS_PARSE_STOC_RENEGOTIATE,
867 SSL_R_RENEGOTIATION_MISMATCH);
868 *al = SSL_AD_HANDSHAKE_FAILURE;
872 if (!PACKET_get_bytes(pkt, &data, s->s3->previous_client_finished_len)
873 || memcmp(data, s->s3->previous_client_finished,
874 s->s3->previous_client_finished_len) != 0) {
875 SSLerr(SSL_F_TLS_PARSE_STOC_RENEGOTIATE,
876 SSL_R_RENEGOTIATION_MISMATCH);
877 *al = SSL_AD_HANDSHAKE_FAILURE;
881 if (!PACKET_get_bytes(pkt, &data, s->s3->previous_server_finished_len)
882 || memcmp(data, s->s3->previous_server_finished,
883 s->s3->previous_server_finished_len) != 0) {
884 SSLerr(SSL_F_TLS_PARSE_STOC_RENEGOTIATE,
885 SSL_R_RENEGOTIATION_MISMATCH);
886 *al = SSL_AD_ILLEGAL_PARAMETER;
889 s->s3->send_connection_binding = 1;
894 int tls_parse_stoc_server_name(SSL *s, PACKET *pkt, X509 *x, size_t chainidx,
897 if (s->ext.hostname == NULL || PACKET_remaining(pkt) > 0) {
898 *al = SSL_AD_UNRECOGNIZED_NAME;
903 if (s->session->ext.hostname != NULL) {
904 *al = SSL_AD_INTERNAL_ERROR;
907 s->session->ext.hostname = OPENSSL_strdup(s->ext.hostname);
908 if (s->session->ext.hostname == NULL) {
909 *al = SSL_AD_INTERNAL_ERROR;
917 #ifndef OPENSSL_NO_EC
918 int tls_parse_stoc_ec_pt_formats(SSL *s, PACKET *pkt, X509 *x, size_t chainidx,
921 unsigned int ecpointformats_len;
922 PACKET ecptformatlist;
924 if (!PACKET_as_length_prefixed_1(pkt, &ecptformatlist)) {
925 *al = SSL_AD_DECODE_ERROR;
929 ecpointformats_len = PACKET_remaining(&ecptformatlist);
930 s->session->ext.ecpointformats_len = 0;
932 OPENSSL_free(s->session->ext.ecpointformats);
933 s->session->ext.ecpointformats = OPENSSL_malloc(ecpointformats_len);
934 if (s->session->ext.ecpointformats == NULL) {
935 *al = SSL_AD_INTERNAL_ERROR;
939 s->session->ext.ecpointformats_len = ecpointformats_len;
941 if (!PACKET_copy_bytes(&ecptformatlist,
942 s->session->ext.ecpointformats,
943 ecpointformats_len)) {
944 *al = SSL_AD_INTERNAL_ERROR;
953 int tls_parse_stoc_session_ticket(SSL *s, PACKET *pkt, X509 *x, size_t chainidx,
956 if (s->ext.session_ticket_cb != NULL &&
957 !s->ext.session_ticket_cb(s, PACKET_data(pkt),
958 PACKET_remaining(pkt),
959 s->ext.session_ticket_cb_arg)) {
960 *al = SSL_AD_INTERNAL_ERROR;
964 if (!tls_use_ticket(s) || PACKET_remaining(pkt) > 0) {
965 *al = SSL_AD_UNSUPPORTED_EXTENSION;
969 s->ext.ticket_expected = 1;
974 #ifndef OPENSSL_NO_OCSP
975 int tls_parse_stoc_status_request(SSL *s, PACKET *pkt, X509 *x, size_t chainidx,
979 * MUST only be sent if we've requested a status
980 * request message. In TLS <= 1.2 it must also be empty.
982 if (s->ext.status_type == TLSEXT_STATUSTYPE_nothing
983 || (!SSL_IS_TLS13(s) && PACKET_remaining(pkt) > 0)) {
984 *al = SSL_AD_UNSUPPORTED_EXTENSION;
988 if (SSL_IS_TLS13(s)) {
989 /* We only know how to handle this if it's for the first Certificate in
990 * the chain. We ignore any other repsonses.
994 return tls_process_cert_status_body(s, pkt, al);
997 /* Set flag to expect CertificateStatus message */
998 s->ext.status_expected = 1;
1005 #ifndef OPENSSL_NO_CT
1006 int tls_parse_stoc_sct(SSL *s, PACKET *pkt, X509 *x, size_t chainidx, int *al)
1009 * Only take it if we asked for it - i.e if there is no CT validation
1010 * callback set, then a custom extension MAY be processing it, so we
1011 * need to let control continue to flow to that.
1013 if (s->ct_validation_callback != NULL) {
1014 size_t size = PACKET_remaining(pkt);
1016 /* Simply copy it off for later processing */
1017 OPENSSL_free(s->ext.scts);
1020 s->ext.scts_len = size;
1022 s->ext.scts = OPENSSL_malloc(size);
1023 if (s->ext.scts == NULL
1024 || !PACKET_copy_bytes(pkt, s->ext.scts, size)) {
1025 *al = SSL_AD_INTERNAL_ERROR;
1030 if (custom_ext_parse(s, 0, TLSEXT_TYPE_signed_certificate_timestamp,
1031 PACKET_data(pkt), PACKET_remaining(pkt), al) <= 0)
1040 #ifndef OPENSSL_NO_NEXTPROTONEG
1042 * ssl_next_proto_validate validates a Next Protocol Negotiation block. No
1043 * elements of zero length are allowed and the set of elements must exactly
1044 * fill the length of the block. Returns 1 on success or 0 on failure.
1046 static int ssl_next_proto_validate(PACKET *pkt)
1048 PACKET tmp_protocol;
1050 while (PACKET_remaining(pkt)) {
1051 if (!PACKET_get_length_prefixed_1(pkt, &tmp_protocol)
1052 || PACKET_remaining(&tmp_protocol) == 0)
1059 int tls_parse_stoc_npn(SSL *s, PACKET *pkt, X509 *x, size_t chainidx, int *al)
1061 unsigned char *selected;
1062 unsigned char selected_len;
1065 /* Check if we are in a renegotiation. If so ignore this extension */
1066 if (!SSL_IS_FIRST_HANDSHAKE(s))
1069 /* We must have requested it. */
1070 if (s->ctx->ext.npn_select_cb == NULL) {
1071 *al = SSL_AD_UNSUPPORTED_EXTENSION;
1075 /* The data must be valid */
1077 if (!ssl_next_proto_validate(&tmppkt)) {
1078 *al = SSL_AD_DECODE_ERROR;
1081 if (s->ctx->ext.npn_select_cb(s, &selected, &selected_len,
1083 PACKET_remaining(pkt),
1084 s->ctx->ext.npn_select_cb_arg) !=
1085 SSL_TLSEXT_ERR_OK) {
1086 *al = SSL_AD_INTERNAL_ERROR;
1091 * Could be non-NULL if server has sent multiple NPN extensions in
1092 * a single Serverhello
1094 OPENSSL_free(s->ext.npn);
1095 s->ext.npn = OPENSSL_malloc(selected_len);
1096 if (s->ext.npn == NULL) {
1097 *al = SSL_AD_INTERNAL_ERROR;
1101 memcpy(s->ext.npn, selected, selected_len);
1102 s->ext.npn_len = selected_len;
1103 s->s3->npn_seen = 1;
1109 int tls_parse_stoc_alpn(SSL *s, PACKET *pkt, X509 *x, size_t chainidx, int *al)
1113 /* We must have requested it. */
1114 if (!s->s3->alpn_sent) {
1115 *al = SSL_AD_UNSUPPORTED_EXTENSION;
1119 * The extension data consists of:
1120 * uint16 list_length
1121 * uint8 proto_length;
1122 * uint8 proto[proto_length];
1124 if (!PACKET_get_net_2_len(pkt, &len)
1125 || PACKET_remaining(pkt) != len || !PACKET_get_1_len(pkt, &len)
1126 || PACKET_remaining(pkt) != len) {
1127 *al = SSL_AD_DECODE_ERROR;
1130 OPENSSL_free(s->s3->alpn_selected);
1131 s->s3->alpn_selected = OPENSSL_malloc(len);
1132 if (s->s3->alpn_selected == NULL) {
1133 *al = SSL_AD_INTERNAL_ERROR;
1136 if (!PACKET_copy_bytes(pkt, s->s3->alpn_selected, len)) {
1137 *al = SSL_AD_DECODE_ERROR;
1140 s->s3->alpn_selected_len = len;
1145 #ifndef OPENSSL_NO_SRTP
1146 int tls_parse_stoc_use_srtp(SSL *s, PACKET *pkt, X509 *x, size_t chainidx,
1149 unsigned int id, ct, mki;
1151 STACK_OF(SRTP_PROTECTION_PROFILE) *clnt;
1152 SRTP_PROTECTION_PROFILE *prof;
1154 if (!PACKET_get_net_2(pkt, &ct) || ct != 2
1155 || !PACKET_get_net_2(pkt, &id)
1156 || !PACKET_get_1(pkt, &mki)
1157 || PACKET_remaining(pkt) != 0) {
1158 SSLerr(SSL_F_TLS_PARSE_STOC_USE_SRTP,
1159 SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST);
1160 *al = SSL_AD_DECODE_ERROR;
1165 /* Must be no MKI, since we never offer one */
1166 SSLerr(SSL_F_TLS_PARSE_STOC_USE_SRTP, SSL_R_BAD_SRTP_MKI_VALUE);
1167 *al = SSL_AD_ILLEGAL_PARAMETER;
1171 /* Throw an error if the server gave us an unsolicited extension */
1172 clnt = SSL_get_srtp_profiles(s);
1174 SSLerr(SSL_F_TLS_PARSE_STOC_USE_SRTP, SSL_R_NO_SRTP_PROFILES);
1175 *al = SSL_AD_DECODE_ERROR;
1180 * Check to see if the server gave us something we support (and
1181 * presumably offered)
1183 for (i = 0; i < sk_SRTP_PROTECTION_PROFILE_num(clnt); i++) {
1184 prof = sk_SRTP_PROTECTION_PROFILE_value(clnt, i);
1186 if (prof->id == id) {
1187 s->srtp_profile = prof;
1193 SSLerr(SSL_F_TLS_PARSE_STOC_USE_SRTP,
1194 SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST);
1195 *al = SSL_AD_DECODE_ERROR;
1200 int tls_parse_stoc_etm(SSL *s, PACKET *pkt, X509 *x, size_t chainidx, int *al)
1202 /* Ignore if inappropriate ciphersuite */
1203 if (!(s->options & SSL_OP_NO_ENCRYPT_THEN_MAC)
1204 && s->s3->tmp.new_cipher->algorithm_mac != SSL_AEAD
1205 && s->s3->tmp.new_cipher->algorithm_enc != SSL_RC4)
1206 s->s3->flags |= TLS1_FLAGS_ENCRYPT_THEN_MAC;
1211 int tls_parse_stoc_ems(SSL *s, PACKET *pkt, X509 *x, size_t chainidx, int *al)
1213 s->s3->flags |= TLS1_FLAGS_RECEIVED_EXTMS;
1215 s->session->flags |= SSL_SESS_FLAG_EXTMS;
1220 int tls_parse_stoc_key_share(SSL *s, PACKET *pkt, X509 *x, size_t chainidx,
1223 #ifndef OPENSSL_NO_TLS1_3
1224 unsigned int group_id;
1226 EVP_PKEY *ckey = s->s3->tmp.pkey, *skey = NULL;
1230 *al = SSL_AD_INTERNAL_ERROR;
1231 SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE, ERR_R_INTERNAL_ERROR);
1235 if (!PACKET_get_net_2(pkt, &group_id)) {
1236 *al = SSL_AD_HANDSHAKE_FAILURE;
1237 SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE, SSL_R_LENGTH_MISMATCH);
1241 if (group_id != s->s3->group_id) {
1243 * This isn't for the group that we sent in the original
1246 *al = SSL_AD_HANDSHAKE_FAILURE;
1247 SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE, SSL_R_BAD_KEY_SHARE);
1251 if (!PACKET_as_length_prefixed_2(pkt, &encoded_pt)
1252 || PACKET_remaining(&encoded_pt) == 0) {
1253 *al = SSL_AD_DECODE_ERROR;
1254 SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE, SSL_R_LENGTH_MISMATCH);
1258 skey = ssl_generate_pkey(ckey);
1260 *al = SSL_AD_INTERNAL_ERROR;
1261 SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE, ERR_R_MALLOC_FAILURE);
1264 if (!EVP_PKEY_set1_tls_encodedpoint(skey, PACKET_data(&encoded_pt),
1265 PACKET_remaining(&encoded_pt))) {
1266 *al = SSL_AD_DECODE_ERROR;
1267 SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE, SSL_R_BAD_ECPOINT);
1268 EVP_PKEY_free(skey);
1272 if (ssl_derive(s, ckey, skey, 1) == 0) {
1273 *al = SSL_AD_INTERNAL_ERROR;
1274 SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE, ERR_R_INTERNAL_ERROR);
1275 EVP_PKEY_free(skey);
1278 EVP_PKEY_free(skey);
1284 int tls_parse_stoc_psk(SSL *s, PACKET *pkt, X509 *x, size_t chainidx, int *al)
1286 #ifndef OPENSSL_NO_TLS1_3
1287 unsigned int identity;
1289 if (!PACKET_get_net_2(pkt, &identity) || PACKET_remaining(pkt) != 0) {
1290 *al = SSL_AD_HANDSHAKE_FAILURE;
1291 SSLerr(SSL_F_TLS_PARSE_STOC_PSK, SSL_R_LENGTH_MISMATCH);
1295 if (s->session->ext.tick_identity != (int)identity) {
1296 *al = SSL_AD_HANDSHAKE_FAILURE;
1297 SSLerr(SSL_F_TLS_PARSE_STOC_PSK, SSL_R_BAD_PSK_IDENTITY);