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, unsigned int context,
16 X509 *x, 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, unsigned int context,
35 X509 *x, 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, unsigned int context, X509 *x,
60 size_t chainidx, int *al)
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_early_data(SSL *s, WPACKET *pkt, unsigned int context,
112 X509 *x, size_t chainidx, int *al)
114 if (s->early_data_state != SSL_EARLY_DATA_CONNECTING
115 || s->session->ext.max_early_data == 0) {
116 s->max_early_data = 0;
119 s->max_early_data = s->session->ext.max_early_data;
121 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_early_data)
122 || !WPACKET_start_sub_packet_u16(pkt)
123 || !WPACKET_close(pkt)) {
124 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_EARLY_DATA, ERR_R_INTERNAL_ERROR);
129 * We set this to rejected here. Later, if the server acknowledges the
130 * extension, we set it to accepted.
132 s->ext.early_data = SSL_EARLY_DATA_REJECTED;
137 int tls_construct_ctos_ec_pt_formats(SSL *s, WPACKET *pkt, unsigned int context,
138 X509 *x, size_t chainidx, int *al)
140 const unsigned char *pformats;
146 /* Add TLS extension ECPointFormats to the ClientHello message */
147 tls1_get_formatlist(s, &pformats, &num_formats);
149 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_ec_point_formats)
150 /* Sub-packet for formats extension */
151 || !WPACKET_start_sub_packet_u16(pkt)
152 || !WPACKET_sub_memcpy_u8(pkt, pformats, num_formats)
153 || !WPACKET_close(pkt)) {
154 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_EC_PT_FORMATS, ERR_R_INTERNAL_ERROR);
161 int tls_construct_ctos_supported_groups(SSL *s, WPACKET *pkt,
162 unsigned int context, X509 *x,
163 size_t chainidx, int *al)
165 const unsigned char *pcurves = NULL, *pcurvestmp;
166 size_t num_curves = 0, i;
172 * Add TLS extension supported_groups to the ClientHello message
174 /* TODO(TLS1.3): Add support for DHE groups */
175 pcurves = s->ext.supportedgroups;
176 if (!tls1_get_curvelist(s, 0, &pcurves, &num_curves)) {
177 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_GROUPS,
178 ERR_R_INTERNAL_ERROR);
181 pcurvestmp = pcurves;
183 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_supported_groups)
184 /* Sub-packet for supported_groups extension */
185 || !WPACKET_start_sub_packet_u16(pkt)
186 || !WPACKET_start_sub_packet_u16(pkt)) {
187 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_GROUPS,
188 ERR_R_INTERNAL_ERROR);
191 /* Copy curve ID if supported */
192 for (i = 0; i < num_curves; i++, pcurvestmp += 2) {
193 if (tls_curve_allowed(s, pcurvestmp, SSL_SECOP_CURVE_SUPPORTED)) {
194 if (!WPACKET_put_bytes_u8(pkt, pcurvestmp[0])
195 || !WPACKET_put_bytes_u8(pkt, pcurvestmp[1])) {
196 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_GROUPS,
197 ERR_R_INTERNAL_ERROR);
202 if (!WPACKET_close(pkt) || !WPACKET_close(pkt)) {
203 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_GROUPS,
204 ERR_R_INTERNAL_ERROR);
212 int tls_construct_ctos_session_ticket(SSL *s, WPACKET *pkt,
213 unsigned int context, X509 *x,
214 size_t chainidx, int *al)
218 if (!tls_use_ticket(s))
221 if (!s->new_session && s->session != NULL
222 && s->session->ext.tick != NULL
223 && s->session->ssl_version != TLS1_3_VERSION) {
224 ticklen = s->session->ext.ticklen;
225 } else if (s->session && s->ext.session_ticket != NULL
226 && s->ext.session_ticket->data != NULL) {
227 ticklen = s->ext.session_ticket->length;
228 s->session->ext.tick = OPENSSL_malloc(ticklen);
229 if (s->session->ext.tick == NULL) {
230 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SESSION_TICKET,
231 ERR_R_INTERNAL_ERROR);
234 memcpy(s->session->ext.tick,
235 s->ext.session_ticket->data, ticklen);
236 s->session->ext.ticklen = ticklen;
241 if (ticklen == 0 && s->ext.session_ticket != NULL &&
242 s->ext.session_ticket->data == NULL)
245 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_session_ticket)
246 || !WPACKET_sub_memcpy_u16(pkt, s->session->ext.tick, ticklen)) {
247 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SESSION_TICKET, ERR_R_INTERNAL_ERROR);
254 int tls_construct_ctos_sig_algs(SSL *s, WPACKET *pkt, unsigned int context,
255 X509 *x, size_t chainidx, int *al)
258 const uint16_t *salg;
260 if (!SSL_CLIENT_USE_SIGALGS(s))
263 salglen = tls12_get_psigalgs(s, 1, &salg);
264 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_signature_algorithms)
265 /* Sub-packet for sig-algs extension */
266 || !WPACKET_start_sub_packet_u16(pkt)
267 /* Sub-packet for the actual list */
268 || !WPACKET_start_sub_packet_u16(pkt)
269 || !tls12_copy_sigalgs(s, pkt, salg, salglen)
270 || !WPACKET_close(pkt)
271 || !WPACKET_close(pkt)) {
272 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SIG_ALGS, ERR_R_INTERNAL_ERROR);
279 #ifndef OPENSSL_NO_OCSP
280 int tls_construct_ctos_status_request(SSL *s, WPACKET *pkt,
281 unsigned int context, X509 *x,
282 size_t chainidx, int *al)
286 /* This extension isn't defined for client Certificates */
290 if (s->ext.status_type != TLSEXT_STATUSTYPE_ocsp)
293 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_status_request)
294 /* Sub-packet for status request extension */
295 || !WPACKET_start_sub_packet_u16(pkt)
296 || !WPACKET_put_bytes_u8(pkt, TLSEXT_STATUSTYPE_ocsp)
297 /* Sub-packet for the ids */
298 || !WPACKET_start_sub_packet_u16(pkt)) {
299 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_STATUS_REQUEST, ERR_R_INTERNAL_ERROR);
302 for (i = 0; i < sk_OCSP_RESPID_num(s->ext.ocsp.ids); i++) {
303 unsigned char *idbytes;
304 OCSP_RESPID *id = sk_OCSP_RESPID_value(s->ext.ocsp.ids, i);
305 int idlen = i2d_OCSP_RESPID(id, NULL);
308 /* Sub-packet for an individual id */
309 || !WPACKET_sub_allocate_bytes_u16(pkt, idlen, &idbytes)
310 || i2d_OCSP_RESPID(id, &idbytes) != idlen) {
311 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_STATUS_REQUEST,
312 ERR_R_INTERNAL_ERROR);
316 if (!WPACKET_close(pkt)
317 || !WPACKET_start_sub_packet_u16(pkt)) {
318 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_STATUS_REQUEST, ERR_R_INTERNAL_ERROR);
321 if (s->ext.ocsp.exts) {
322 unsigned char *extbytes;
323 int extlen = i2d_X509_EXTENSIONS(s->ext.ocsp.exts, NULL);
326 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_STATUS_REQUEST,
327 ERR_R_INTERNAL_ERROR);
330 if (!WPACKET_allocate_bytes(pkt, extlen, &extbytes)
331 || i2d_X509_EXTENSIONS(s->ext.ocsp.exts, &extbytes)
333 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_STATUS_REQUEST,
334 ERR_R_INTERNAL_ERROR);
338 if (!WPACKET_close(pkt) || !WPACKET_close(pkt)) {
339 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_STATUS_REQUEST, ERR_R_INTERNAL_ERROR);
347 #ifndef OPENSSL_NO_NEXTPROTONEG
348 int tls_construct_ctos_npn(SSL *s, WPACKET *pkt, unsigned int context, X509 *x,
349 size_t chainidx, int *al)
351 if (s->ctx->ext.npn_select_cb == NULL || !SSL_IS_FIRST_HANDSHAKE(s))
355 * The client advertises an empty extension to indicate its support
356 * for Next Protocol Negotiation
358 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_next_proto_neg)
359 || !WPACKET_put_bytes_u16(pkt, 0)) {
360 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_NPN, ERR_R_INTERNAL_ERROR);
368 int tls_construct_ctos_alpn(SSL *s, WPACKET *pkt, unsigned int context, X509 *x,
369 size_t chainidx, int *al)
371 s->s3->alpn_sent = 0;
373 if (s->ext.alpn == NULL || !SSL_IS_FIRST_HANDSHAKE(s))
376 if (!WPACKET_put_bytes_u16(pkt,
377 TLSEXT_TYPE_application_layer_protocol_negotiation)
378 /* Sub-packet ALPN extension */
379 || !WPACKET_start_sub_packet_u16(pkt)
380 || !WPACKET_sub_memcpy_u16(pkt, s->ext.alpn, s->ext.alpn_len)
381 || !WPACKET_close(pkt)) {
382 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_ALPN, ERR_R_INTERNAL_ERROR);
385 s->s3->alpn_sent = 1;
391 #ifndef OPENSSL_NO_SRTP
392 int tls_construct_ctos_use_srtp(SSL *s, WPACKET *pkt, unsigned int context,
393 X509 *x, size_t chainidx, int *al)
395 STACK_OF(SRTP_PROTECTION_PROFILE) *clnt = SSL_get_srtp_profiles(s);
401 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_use_srtp)
402 /* Sub-packet for SRTP extension */
403 || !WPACKET_start_sub_packet_u16(pkt)
404 /* Sub-packet for the protection profile list */
405 || !WPACKET_start_sub_packet_u16(pkt)) {
406 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_USE_SRTP, ERR_R_INTERNAL_ERROR);
410 end = sk_SRTP_PROTECTION_PROFILE_num(clnt);
411 for (i = 0; i < end; i++) {
412 const SRTP_PROTECTION_PROFILE *prof =
413 sk_SRTP_PROTECTION_PROFILE_value(clnt, i);
415 if (prof == NULL || !WPACKET_put_bytes_u16(pkt, prof->id)) {
416 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_USE_SRTP, ERR_R_INTERNAL_ERROR);
420 if (!WPACKET_close(pkt)
421 /* Add an empty use_mki value */
422 || !WPACKET_put_bytes_u8(pkt, 0)
423 || !WPACKET_close(pkt)) {
424 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_USE_SRTP, ERR_R_INTERNAL_ERROR);
432 int tls_construct_ctos_etm(SSL *s, WPACKET *pkt, unsigned int context, X509 *x,
433 size_t chainidx, int *al)
435 if (s->options & SSL_OP_NO_ENCRYPT_THEN_MAC)
438 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_encrypt_then_mac)
439 || !WPACKET_put_bytes_u16(pkt, 0)) {
440 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_ETM, ERR_R_INTERNAL_ERROR);
447 #ifndef OPENSSL_NO_CT
448 int tls_construct_ctos_sct(SSL *s, WPACKET *pkt, unsigned int context, X509 *x,
449 size_t chainidx, int *al)
451 if (s->ct_validation_callback == NULL)
454 /* Not defined for client Certificates */
458 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_signed_certificate_timestamp)
459 || !WPACKET_put_bytes_u16(pkt, 0)) {
460 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SCT, ERR_R_INTERNAL_ERROR);
468 int tls_construct_ctos_ems(SSL *s, WPACKET *pkt, unsigned int context, X509 *x,
469 size_t chainidx, int *al)
471 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_extended_master_secret)
472 || !WPACKET_put_bytes_u16(pkt, 0)) {
473 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_EMS, ERR_R_INTERNAL_ERROR);
480 int tls_construct_ctos_supported_versions(SSL *s, WPACKET *pkt,
481 unsigned int context, X509 *x,
482 size_t chainidx, int *al)
484 int currv, min_version, max_version, reason;
486 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_supported_versions)
487 || !WPACKET_start_sub_packet_u16(pkt)
488 || !WPACKET_start_sub_packet_u8(pkt)) {
489 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_VERSIONS,
490 ERR_R_INTERNAL_ERROR);
494 reason = ssl_get_client_min_max_version(s, &min_version, &max_version);
496 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_VERSIONS, reason);
501 * TODO(TLS1.3): There is some discussion on the TLS list as to wheter
502 * we should include versions <TLS1.2. For the moment we do. To be
505 for (currv = max_version; currv >= min_version; currv--) {
506 /* TODO(TLS1.3): Remove this first if clause prior to release!! */
507 if (currv == TLS1_3_VERSION) {
508 if (!WPACKET_put_bytes_u16(pkt, TLS1_3_VERSION_DRAFT)) {
509 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_VERSIONS,
510 ERR_R_INTERNAL_ERROR);
513 } else if (!WPACKET_put_bytes_u16(pkt, currv)) {
514 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_VERSIONS,
515 ERR_R_INTERNAL_ERROR);
519 if (!WPACKET_close(pkt) || !WPACKET_close(pkt)) {
520 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_VERSIONS,
521 ERR_R_INTERNAL_ERROR);
529 * Construct a psk_kex_modes extension. We only have two modes we know about
530 * at this stage, so we send both.
532 int tls_construct_ctos_psk_kex_modes(SSL *s, WPACKET *pkt, unsigned int context,
533 X509 *x, size_t chainidx, int *al)
535 #ifndef OPENSSL_NO_TLS1_3
537 * TODO(TLS1.3): Do we want this list to be configurable? For now we always
538 * just send both supported modes
540 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_psk_kex_modes)
541 || !WPACKET_start_sub_packet_u16(pkt)
542 || !WPACKET_start_sub_packet_u8(pkt)
543 || !WPACKET_put_bytes_u8(pkt, TLSEXT_KEX_MODE_KE_DHE)
544 || !WPACKET_put_bytes_u8(pkt, TLSEXT_KEX_MODE_KE)
545 || !WPACKET_close(pkt)
546 || !WPACKET_close(pkt)) {
547 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_PSK_KEX_MODES, ERR_R_INTERNAL_ERROR);
551 s->ext.psk_kex_mode = TLSEXT_KEX_MODE_FLAG_KE | TLSEXT_KEX_MODE_FLAG_KE_DHE;
557 #ifndef OPENSSL_NO_TLS1_3
558 static int add_key_share(SSL *s, WPACKET *pkt, unsigned int curve_id)
560 unsigned char *encoded_point;
561 EVP_PKEY *key_share_key;
564 key_share_key = ssl_generate_pkey_curve(curve_id);
565 if (key_share_key == NULL) {
566 SSLerr(SSL_F_ADD_KEY_SHARE, ERR_R_EVP_LIB);
570 /* Encode the public key. */
571 encodedlen = EVP_PKEY_get1_tls_encodedpoint(key_share_key,
573 if (encodedlen == 0) {
574 SSLerr(SSL_F_ADD_KEY_SHARE, ERR_R_EC_LIB);
575 EVP_PKEY_free(key_share_key);
579 /* Create KeyShareEntry */
580 if (!WPACKET_put_bytes_u16(pkt, curve_id)
581 || !WPACKET_sub_memcpy_u16(pkt, encoded_point, encodedlen)) {
582 SSLerr(SSL_F_ADD_KEY_SHARE, ERR_R_INTERNAL_ERROR);
583 EVP_PKEY_free(key_share_key);
584 OPENSSL_free(encoded_point);
589 * TODO(TLS1.3): When changing to send more than one key_share we're
590 * going to need to be able to save more than one EVP_PKEY. For now
591 * we reuse the existing tmp.pkey
593 s->s3->tmp.pkey = key_share_key;
594 s->s3->group_id = curve_id;
595 OPENSSL_free(encoded_point);
601 int tls_construct_ctos_key_share(SSL *s, WPACKET *pkt, unsigned int context,
602 X509 *x, size_t chainidx, int *al)
604 #ifndef OPENSSL_NO_TLS1_3
605 size_t i, num_curves = 0;
606 const unsigned char *pcurves = NULL;
607 unsigned int curve_id = 0;
609 /* key_share extension */
610 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_key_share)
611 /* Extension data sub-packet */
612 || !WPACKET_start_sub_packet_u16(pkt)
613 /* KeyShare list sub-packet */
614 || !WPACKET_start_sub_packet_u16(pkt)) {
615 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_KEY_SHARE, ERR_R_INTERNAL_ERROR);
619 pcurves = s->ext.supportedgroups;
620 if (!tls1_get_curvelist(s, 0, &pcurves, &num_curves)) {
621 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_KEY_SHARE, ERR_R_INTERNAL_ERROR);
625 if (s->s3->tmp.pkey != NULL) {
626 /* Shouldn't happen! */
627 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_KEY_SHARE, ERR_R_INTERNAL_ERROR);
632 * TODO(TLS1.3): Make the number of key_shares sent configurable. For
635 if (s->s3->group_id != 0) {
636 curve_id = s->s3->group_id;
638 for (i = 0; i < num_curves; i++, pcurves += 2) {
640 if (!tls_curve_allowed(s, pcurves, SSL_SECOP_CURVE_SUPPORTED))
643 curve_id = bytestogroup(pcurves);
649 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_KEY_SHARE, SSL_R_NO_SUITABLE_KEY_SHARE);
653 if (!add_key_share(s, pkt, curve_id))
656 if (!WPACKET_close(pkt) || !WPACKET_close(pkt)) {
657 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_KEY_SHARE, ERR_R_INTERNAL_ERROR);
665 #define F5_WORKAROUND_MIN_MSG_LEN 0xff
666 #define F5_WORKAROUND_MAX_MSG_LEN 0x200
668 int tls_construct_ctos_padding(SSL *s, WPACKET *pkt, unsigned int context,
669 X509 *x, size_t chainidx, int *al)
671 unsigned char *padbytes;
674 if ((s->options & SSL_OP_TLSEXT_PADDING) == 0)
678 * Add padding to workaround bugs in F5 terminators. See
679 * https://tools.ietf.org/html/draft-agl-tls-padding-03 NB: because this
680 * code calculates the length of all existing extensions it MUST always
683 if (!WPACKET_get_total_written(pkt, &hlen)) {
684 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_PADDING, ERR_R_INTERNAL_ERROR);
688 if (hlen > F5_WORKAROUND_MIN_MSG_LEN && hlen < F5_WORKAROUND_MAX_MSG_LEN) {
689 /* Calculate the amond of padding we need to add */
690 hlen = F5_WORKAROUND_MAX_MSG_LEN - hlen;
693 * Take off the size of extension header itself (2 bytes for type and
694 * 2 bytes for length bytes)
701 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_padding)
702 || !WPACKET_sub_allocate_bytes_u16(pkt, hlen, &padbytes)) {
703 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_PADDING, ERR_R_INTERNAL_ERROR);
706 memset(padbytes, 0, hlen);
713 * Construct the pre_shared_key extension
715 int tls_construct_ctos_psk(SSL *s, WPACKET *pkt, unsigned int context, X509 *x,
716 size_t chainidx, int *al)
718 #ifndef OPENSSL_NO_TLS1_3
719 uint32_t now, agesec, agems;
720 size_t hashsize, binderoffset, msglen;
721 unsigned char *binder = NULL, *msgstart = NULL;
725 s->session->ext.tick_identity = TLSEXT_PSK_BAD_IDENTITY;
728 * If this is an incompatible or new session then we have nothing to resume
729 * so don't add this extension.
731 if (s->session->ssl_version != TLS1_3_VERSION
732 || s->session->ext.ticklen == 0)
735 if (s->session->cipher == NULL) {
736 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_PSK, ERR_R_INTERNAL_ERROR);
740 md = ssl_md(s->session->cipher->algorithm2);
742 /* Don't recognise this cipher so we can't use the session. Ignore it */
747 * Technically the C standard just says time() returns a time_t and says
748 * nothing about the encoding of that type. In practice most implementations
749 * follow POSIX which holds it as an integral type in seconds since epoch.
750 * We've already made the assumption that we can do this in multiple places
751 * in the code, so portability shouldn't be an issue.
753 now = (uint32_t)time(NULL);
754 agesec = now - (uint32_t)s->session->time;
756 if (s->session->ext.tick_lifetime_hint < agesec) {
757 /* Ticket is too old. Ignore it. */
762 * Calculate age in ms. We're just doing it to nearest second. Should be
765 agems = agesec * (uint32_t)1000;
767 if (agesec != 0 && agems / (uint32_t)1000 != agesec) {
769 * Overflow. Shouldn't happen unless this is a *really* old session. If
770 * so we just ignore it.
776 * Obfuscate the age. Overflow here is fine, this addition is supposed to
779 agems += s->session->ext.tick_age_add;
781 hashsize = EVP_MD_size(md);
783 /* Create the extension, but skip over the binder for now */
784 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_psk)
785 || !WPACKET_start_sub_packet_u16(pkt)
786 || !WPACKET_start_sub_packet_u16(pkt)
787 || !WPACKET_sub_memcpy_u16(pkt, s->session->ext.tick,
788 s->session->ext.ticklen)
789 || !WPACKET_put_bytes_u32(pkt, agems)
790 || !WPACKET_close(pkt)
791 || !WPACKET_get_total_written(pkt, &binderoffset)
792 || !WPACKET_start_sub_packet_u16(pkt)
793 || !WPACKET_sub_allocate_bytes_u8(pkt, hashsize, &binder)
794 || !WPACKET_close(pkt)
795 || !WPACKET_close(pkt)
796 || !WPACKET_get_total_written(pkt, &msglen)
798 * We need to fill in all the sub-packet lengths now so we can
799 * calculate the HMAC of the message up to the binders
801 || !WPACKET_fill_lengths(pkt)) {
802 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_PSK, ERR_R_INTERNAL_ERROR);
806 msgstart = WPACKET_get_curr(pkt) - msglen;
808 if (tls_psk_do_binder(s, md, msgstart, binderoffset, NULL, binder,
809 s->session, 1) != 1) {
810 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_PSK, ERR_R_INTERNAL_ERROR);
814 s->session->ext.tick_identity = 0;
825 * Parse the server's renegotiation binding and abort if it's not right
827 int tls_parse_stoc_renegotiate(SSL *s, PACKET *pkt, unsigned int context,
828 X509 *x, size_t chainidx, int *al)
830 size_t expected_len = s->s3->previous_client_finished_len
831 + s->s3->previous_server_finished_len;
833 const unsigned char *data;
835 /* Check for logic errors */
836 assert(expected_len == 0 || s->s3->previous_client_finished_len != 0);
837 assert(expected_len == 0 || s->s3->previous_server_finished_len != 0);
839 /* Parse the length byte */
840 if (!PACKET_get_1_len(pkt, &ilen)) {
841 SSLerr(SSL_F_TLS_PARSE_STOC_RENEGOTIATE,
842 SSL_R_RENEGOTIATION_ENCODING_ERR);
843 *al = SSL_AD_ILLEGAL_PARAMETER;
847 /* Consistency check */
848 if (PACKET_remaining(pkt) != ilen) {
849 SSLerr(SSL_F_TLS_PARSE_STOC_RENEGOTIATE,
850 SSL_R_RENEGOTIATION_ENCODING_ERR);
851 *al = SSL_AD_ILLEGAL_PARAMETER;
855 /* Check that the extension matches */
856 if (ilen != expected_len) {
857 SSLerr(SSL_F_TLS_PARSE_STOC_RENEGOTIATE,
858 SSL_R_RENEGOTIATION_MISMATCH);
859 *al = SSL_AD_HANDSHAKE_FAILURE;
863 if (!PACKET_get_bytes(pkt, &data, s->s3->previous_client_finished_len)
864 || memcmp(data, s->s3->previous_client_finished,
865 s->s3->previous_client_finished_len) != 0) {
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_server_finished_len)
873 || memcmp(data, s->s3->previous_server_finished,
874 s->s3->previous_server_finished_len) != 0) {
875 SSLerr(SSL_F_TLS_PARSE_STOC_RENEGOTIATE,
876 SSL_R_RENEGOTIATION_MISMATCH);
877 *al = SSL_AD_ILLEGAL_PARAMETER;
880 s->s3->send_connection_binding = 1;
885 int tls_parse_stoc_server_name(SSL *s, PACKET *pkt, unsigned int context,
886 X509 *x, size_t chainidx, int *al)
888 if (s->ext.hostname == NULL || PACKET_remaining(pkt) > 0) {
889 *al = SSL_AD_UNRECOGNIZED_NAME;
894 if (s->session->ext.hostname != NULL) {
895 *al = SSL_AD_INTERNAL_ERROR;
898 s->session->ext.hostname = OPENSSL_strdup(s->ext.hostname);
899 if (s->session->ext.hostname == NULL) {
900 *al = SSL_AD_INTERNAL_ERROR;
908 int tls_parse_stoc_early_data_info(SSL *s, PACKET *pkt, unsigned int context,
909 X509 *x, size_t chainidx, int *al)
911 unsigned long max_early_data;
913 if (!PACKET_get_net_4(pkt, &max_early_data)
914 || PACKET_remaining(pkt) != 0) {
915 SSLerr(SSL_F_TLS_PARSE_STOC_EARLY_DATA_INFO,
916 SSL_R_INVALID_MAX_EARLY_DATA);
917 *al = SSL_AD_DECODE_ERROR;
921 s->session->ext.max_early_data = max_early_data;
926 int tls_parse_stoc_early_data(SSL *s, PACKET *pkt, unsigned int context,
927 X509 *x, size_t chainidx, int *al)
929 if (PACKET_remaining(pkt) != 0) {
930 *al = SSL_AD_DECODE_ERROR;
934 if (s->ext.early_data != SSL_EARLY_DATA_REJECTED
936 || s->session->ext.tick_identity != 0) {
938 * If we get here then we didn't send early data, or we didn't resume
939 * using the first identity so the server should not be accepting it.
941 *al = SSL_AD_ILLEGAL_PARAMETER;
945 s->ext.early_data = SSL_EARLY_DATA_ACCEPTED;
950 #ifndef OPENSSL_NO_EC
951 int tls_parse_stoc_ec_pt_formats(SSL *s, PACKET *pkt, unsigned int context,
952 X509 *x, size_t chainidx, int *al)
954 unsigned int ecpointformats_len;
955 PACKET ecptformatlist;
957 if (!PACKET_as_length_prefixed_1(pkt, &ecptformatlist)) {
958 *al = SSL_AD_DECODE_ERROR;
962 ecpointformats_len = PACKET_remaining(&ecptformatlist);
963 s->session->ext.ecpointformats_len = 0;
965 OPENSSL_free(s->session->ext.ecpointformats);
966 s->session->ext.ecpointformats = OPENSSL_malloc(ecpointformats_len);
967 if (s->session->ext.ecpointformats == NULL) {
968 *al = SSL_AD_INTERNAL_ERROR;
972 s->session->ext.ecpointformats_len = ecpointformats_len;
974 if (!PACKET_copy_bytes(&ecptformatlist,
975 s->session->ext.ecpointformats,
976 ecpointformats_len)) {
977 *al = SSL_AD_INTERNAL_ERROR;
986 int tls_parse_stoc_session_ticket(SSL *s, PACKET *pkt, unsigned int context,
987 X509 *x, size_t chainidx, int *al)
989 if (s->ext.session_ticket_cb != NULL &&
990 !s->ext.session_ticket_cb(s, PACKET_data(pkt),
991 PACKET_remaining(pkt),
992 s->ext.session_ticket_cb_arg)) {
993 *al = SSL_AD_INTERNAL_ERROR;
997 if (!tls_use_ticket(s) || PACKET_remaining(pkt) > 0) {
998 *al = SSL_AD_UNSUPPORTED_EXTENSION;
1002 s->ext.ticket_expected = 1;
1007 #ifndef OPENSSL_NO_OCSP
1008 int tls_parse_stoc_status_request(SSL *s, PACKET *pkt, unsigned int context,
1009 X509 *x, size_t chainidx, int *al)
1012 * MUST only be sent if we've requested a status
1013 * request message. In TLS <= 1.2 it must also be empty.
1015 if (s->ext.status_type == TLSEXT_STATUSTYPE_nothing
1016 || (!SSL_IS_TLS13(s) && PACKET_remaining(pkt) > 0)) {
1017 *al = SSL_AD_UNSUPPORTED_EXTENSION;
1021 if (SSL_IS_TLS13(s)) {
1022 /* We only know how to handle this if it's for the first Certificate in
1023 * the chain. We ignore any other repsonses.
1027 return tls_process_cert_status_body(s, pkt, al);
1030 /* Set flag to expect CertificateStatus message */
1031 s->ext.status_expected = 1;
1038 #ifndef OPENSSL_NO_CT
1039 int tls_parse_stoc_sct(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
1040 size_t chainidx, int *al)
1043 * Only take it if we asked for it - i.e if there is no CT validation
1044 * callback set, then a custom extension MAY be processing it, so we
1045 * need to let control continue to flow to that.
1047 if (s->ct_validation_callback != NULL) {
1048 size_t size = PACKET_remaining(pkt);
1050 /* Simply copy it off for later processing */
1051 OPENSSL_free(s->ext.scts);
1054 s->ext.scts_len = size;
1056 s->ext.scts = OPENSSL_malloc(size);
1057 if (s->ext.scts == NULL
1058 || !PACKET_copy_bytes(pkt, s->ext.scts, size)) {
1059 *al = SSL_AD_INTERNAL_ERROR;
1064 if (custom_ext_parse(s, 0, TLSEXT_TYPE_signed_certificate_timestamp,
1065 PACKET_data(pkt), PACKET_remaining(pkt), al) <= 0)
1074 #ifndef OPENSSL_NO_NEXTPROTONEG
1076 * ssl_next_proto_validate validates a Next Protocol Negotiation block. No
1077 * elements of zero length are allowed and the set of elements must exactly
1078 * fill the length of the block. Returns 1 on success or 0 on failure.
1080 static int ssl_next_proto_validate(PACKET *pkt)
1082 PACKET tmp_protocol;
1084 while (PACKET_remaining(pkt)) {
1085 if (!PACKET_get_length_prefixed_1(pkt, &tmp_protocol)
1086 || PACKET_remaining(&tmp_protocol) == 0)
1093 int tls_parse_stoc_npn(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
1094 size_t chainidx, int *al)
1096 unsigned char *selected;
1097 unsigned char selected_len;
1100 /* Check if we are in a renegotiation. If so ignore this extension */
1101 if (!SSL_IS_FIRST_HANDSHAKE(s))
1104 /* We must have requested it. */
1105 if (s->ctx->ext.npn_select_cb == NULL) {
1106 *al = SSL_AD_UNSUPPORTED_EXTENSION;
1110 /* The data must be valid */
1112 if (!ssl_next_proto_validate(&tmppkt)) {
1113 *al = SSL_AD_DECODE_ERROR;
1116 if (s->ctx->ext.npn_select_cb(s, &selected, &selected_len,
1118 PACKET_remaining(pkt),
1119 s->ctx->ext.npn_select_cb_arg) !=
1120 SSL_TLSEXT_ERR_OK) {
1121 *al = SSL_AD_INTERNAL_ERROR;
1126 * Could be non-NULL if server has sent multiple NPN extensions in
1127 * a single Serverhello
1129 OPENSSL_free(s->ext.npn);
1130 s->ext.npn = OPENSSL_malloc(selected_len);
1131 if (s->ext.npn == NULL) {
1132 *al = SSL_AD_INTERNAL_ERROR;
1136 memcpy(s->ext.npn, selected, selected_len);
1137 s->ext.npn_len = selected_len;
1138 s->s3->npn_seen = 1;
1144 int tls_parse_stoc_alpn(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
1145 size_t chainidx, int *al)
1149 /* We must have requested it. */
1150 if (!s->s3->alpn_sent) {
1151 *al = SSL_AD_UNSUPPORTED_EXTENSION;
1155 * The extension data consists of:
1156 * uint16 list_length
1157 * uint8 proto_length;
1158 * uint8 proto[proto_length];
1160 if (!PACKET_get_net_2_len(pkt, &len)
1161 || PACKET_remaining(pkt) != len || !PACKET_get_1_len(pkt, &len)
1162 || PACKET_remaining(pkt) != len) {
1163 *al = SSL_AD_DECODE_ERROR;
1166 OPENSSL_free(s->s3->alpn_selected);
1167 s->s3->alpn_selected = OPENSSL_malloc(len);
1168 if (s->s3->alpn_selected == NULL) {
1169 *al = SSL_AD_INTERNAL_ERROR;
1172 if (!PACKET_copy_bytes(pkt, s->s3->alpn_selected, len)) {
1173 *al = SSL_AD_DECODE_ERROR;
1176 s->s3->alpn_selected_len = len;
1181 #ifndef OPENSSL_NO_SRTP
1182 int tls_parse_stoc_use_srtp(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
1183 size_t chainidx, int *al)
1185 unsigned int id, ct, mki;
1187 STACK_OF(SRTP_PROTECTION_PROFILE) *clnt;
1188 SRTP_PROTECTION_PROFILE *prof;
1190 if (!PACKET_get_net_2(pkt, &ct) || ct != 2
1191 || !PACKET_get_net_2(pkt, &id)
1192 || !PACKET_get_1(pkt, &mki)
1193 || PACKET_remaining(pkt) != 0) {
1194 SSLerr(SSL_F_TLS_PARSE_STOC_USE_SRTP,
1195 SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST);
1196 *al = SSL_AD_DECODE_ERROR;
1201 /* Must be no MKI, since we never offer one */
1202 SSLerr(SSL_F_TLS_PARSE_STOC_USE_SRTP, SSL_R_BAD_SRTP_MKI_VALUE);
1203 *al = SSL_AD_ILLEGAL_PARAMETER;
1207 /* Throw an error if the server gave us an unsolicited extension */
1208 clnt = SSL_get_srtp_profiles(s);
1210 SSLerr(SSL_F_TLS_PARSE_STOC_USE_SRTP, SSL_R_NO_SRTP_PROFILES);
1211 *al = SSL_AD_DECODE_ERROR;
1216 * Check to see if the server gave us something we support (and
1217 * presumably offered)
1219 for (i = 0; i < sk_SRTP_PROTECTION_PROFILE_num(clnt); i++) {
1220 prof = sk_SRTP_PROTECTION_PROFILE_value(clnt, i);
1222 if (prof->id == id) {
1223 s->srtp_profile = prof;
1229 SSLerr(SSL_F_TLS_PARSE_STOC_USE_SRTP,
1230 SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST);
1231 *al = SSL_AD_DECODE_ERROR;
1236 int tls_parse_stoc_etm(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
1237 size_t chainidx, int *al)
1239 /* Ignore if inappropriate ciphersuite */
1240 if (!(s->options & SSL_OP_NO_ENCRYPT_THEN_MAC)
1241 && s->s3->tmp.new_cipher->algorithm_mac != SSL_AEAD
1242 && s->s3->tmp.new_cipher->algorithm_enc != SSL_RC4)
1248 int tls_parse_stoc_ems(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
1249 size_t chainidx, int *al)
1251 s->s3->flags |= TLS1_FLAGS_RECEIVED_EXTMS;
1253 s->session->flags |= SSL_SESS_FLAG_EXTMS;
1258 int tls_parse_stoc_key_share(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
1259 size_t chainidx, int *al)
1261 #ifndef OPENSSL_NO_TLS1_3
1262 unsigned int group_id;
1264 EVP_PKEY *ckey = s->s3->tmp.pkey, *skey = NULL;
1268 *al = SSL_AD_INTERNAL_ERROR;
1269 SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE, ERR_R_INTERNAL_ERROR);
1273 if (!PACKET_get_net_2(pkt, &group_id)) {
1274 *al = SSL_AD_HANDSHAKE_FAILURE;
1275 SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE, SSL_R_LENGTH_MISMATCH);
1279 if ((context & EXT_TLS1_3_HELLO_RETRY_REQUEST) != 0) {
1280 unsigned const char *pcurves = NULL;
1281 size_t i, num_curves;
1283 if (PACKET_remaining(pkt) != 0) {
1284 *al = SSL_AD_HANDSHAKE_FAILURE;
1285 SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE, SSL_R_LENGTH_MISMATCH);
1290 * It is an error if the HelloRetryRequest wants a key_share that we
1291 * already sent in the first ClientHello
1293 if (group_id == s->s3->group_id) {
1294 *al = SSL_AD_ILLEGAL_PARAMETER;
1295 SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE, SSL_R_BAD_KEY_SHARE);
1299 /* Validate the selected group is one we support */
1300 pcurves = s->ext.supportedgroups;
1301 if (!tls1_get_curvelist(s, 0, &pcurves, &num_curves)) {
1302 SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE, ERR_R_INTERNAL_ERROR);
1305 for (i = 0; i < num_curves; i++, pcurves += 2) {
1306 if (group_id == bytestogroup(pcurves))
1310 || !tls_curve_allowed(s, pcurves, SSL_SECOP_CURVE_SUPPORTED)) {
1311 *al = SSL_AD_ILLEGAL_PARAMETER;
1312 SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE, SSL_R_BAD_KEY_SHARE);
1316 s->s3->group_id = group_id;
1317 EVP_PKEY_free(s->s3->tmp.pkey);
1318 s->s3->tmp.pkey = NULL;
1322 if (group_id != s->s3->group_id) {
1324 * This isn't for the group that we sent in the original
1327 *al = SSL_AD_HANDSHAKE_FAILURE;
1328 SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE, SSL_R_BAD_KEY_SHARE);
1332 if (!PACKET_as_length_prefixed_2(pkt, &encoded_pt)
1333 || PACKET_remaining(&encoded_pt) == 0) {
1334 *al = SSL_AD_DECODE_ERROR;
1335 SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE, SSL_R_LENGTH_MISMATCH);
1339 skey = ssl_generate_pkey(ckey);
1341 *al = SSL_AD_INTERNAL_ERROR;
1342 SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE, ERR_R_MALLOC_FAILURE);
1345 if (!EVP_PKEY_set1_tls_encodedpoint(skey, PACKET_data(&encoded_pt),
1346 PACKET_remaining(&encoded_pt))) {
1347 *al = SSL_AD_DECODE_ERROR;
1348 SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE, SSL_R_BAD_ECPOINT);
1349 EVP_PKEY_free(skey);
1353 if (ssl_derive(s, ckey, skey, 1) == 0) {
1354 *al = SSL_AD_INTERNAL_ERROR;
1355 SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE, ERR_R_INTERNAL_ERROR);
1356 EVP_PKEY_free(skey);
1359 EVP_PKEY_free(skey);
1365 int tls_parse_stoc_psk(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
1366 size_t chainidx, int *al)
1368 #ifndef OPENSSL_NO_TLS1_3
1369 unsigned int identity;
1371 if (!PACKET_get_net_2(pkt, &identity) || PACKET_remaining(pkt) != 0) {
1372 *al = SSL_AD_HANDSHAKE_FAILURE;
1373 SSLerr(SSL_F_TLS_PARSE_STOC_PSK, SSL_R_LENGTH_MISMATCH);
1377 if (s->session->ext.tick_identity != (int)identity) {
1378 *al = SSL_AD_HANDSHAKE_FAILURE;
1379 SSLerr(SSL_F_TLS_PARSE_STOC_PSK, SSL_R_BAD_PSK_IDENTITY);