2 * Copyright 2016-2017 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
10 #include <openssl/ocsp.h>
11 #include "../ssl_locl.h"
12 #include "internal/cryptlib.h"
13 #include "statem_locl.h"
15 EXT_RETURN tls_construct_ctos_renegotiate(SSL *s, WPACKET *pkt,
16 unsigned int context, X509 *x,
19 /* Add RI if renegotiating */
21 return EXT_RETURN_NOT_SENT;
23 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_renegotiate)
24 || !WPACKET_start_sub_packet_u16(pkt)
25 || !WPACKET_sub_memcpy_u8(pkt, s->s3->previous_client_finished,
26 s->s3->previous_client_finished_len)
27 || !WPACKET_close(pkt)) {
28 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CTOS_RENEGOTIATE,
29 ERR_R_INTERNAL_ERROR);
30 return EXT_RETURN_FAIL;
33 return EXT_RETURN_SENT;
36 EXT_RETURN tls_construct_ctos_server_name(SSL *s, WPACKET *pkt,
37 unsigned int context, X509 *x,
40 if (s->ext.hostname == NULL)
41 return EXT_RETURN_NOT_SENT;
43 /* Add TLS extension servername to the Client Hello message */
44 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_server_name)
45 /* Sub-packet for server_name extension */
46 || !WPACKET_start_sub_packet_u16(pkt)
47 /* Sub-packet for servername list (always 1 hostname)*/
48 || !WPACKET_start_sub_packet_u16(pkt)
49 || !WPACKET_put_bytes_u8(pkt, TLSEXT_NAMETYPE_host_name)
50 || !WPACKET_sub_memcpy_u16(pkt, s->ext.hostname,
51 strlen(s->ext.hostname))
52 || !WPACKET_close(pkt)
53 || !WPACKET_close(pkt)) {
54 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CTOS_SERVER_NAME,
55 ERR_R_INTERNAL_ERROR);
56 return EXT_RETURN_FAIL;
59 return EXT_RETURN_SENT;
62 /* Push a Max Fragment Len extension into ClientHello */
63 EXT_RETURN tls_construct_ctos_maxfragmentlen(SSL *s, WPACKET *pkt,
64 unsigned int context, X509 *x,
67 if (s->ext.max_fragment_len_mode == TLSEXT_max_fragment_length_DISABLED)
68 return EXT_RETURN_NOT_SENT;
70 /* Add Max Fragment Length extension if client enabled it. */
72 * 4 bytes for this extension type and extension length
73 * 1 byte for the Max Fragment Length code value.
75 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_max_fragment_length)
76 /* Sub-packet for Max Fragment Length extension (1 byte) */
77 || !WPACKET_start_sub_packet_u16(pkt)
78 || !WPACKET_put_bytes_u8(pkt, s->ext.max_fragment_len_mode)
79 || !WPACKET_close(pkt)) {
80 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
81 SSL_F_TLS_CONSTRUCT_CTOS_MAXFRAGMENTLEN, ERR_R_INTERNAL_ERROR);
82 return EXT_RETURN_FAIL;
85 return EXT_RETURN_SENT;
88 #ifndef OPENSSL_NO_SRP
89 EXT_RETURN tls_construct_ctos_srp(SSL *s, WPACKET *pkt, unsigned int context,
90 X509 *x, size_t chainidx)
92 /* Add SRP username if there is one */
93 if (s->srp_ctx.login == NULL)
94 return EXT_RETURN_NOT_SENT;
96 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_srp)
97 /* Sub-packet for SRP extension */
98 || !WPACKET_start_sub_packet_u16(pkt)
99 || !WPACKET_start_sub_packet_u8(pkt)
100 /* login must not be zero...internal error if so */
101 || !WPACKET_set_flags(pkt, WPACKET_FLAGS_NON_ZERO_LENGTH)
102 || !WPACKET_memcpy(pkt, s->srp_ctx.login,
103 strlen(s->srp_ctx.login))
104 || !WPACKET_close(pkt)
105 || !WPACKET_close(pkt)) {
106 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CTOS_SRP,
107 ERR_R_INTERNAL_ERROR);
108 return EXT_RETURN_FAIL;
111 return EXT_RETURN_SENT;
115 #ifndef OPENSSL_NO_EC
116 static int use_ecc(SSL *s)
119 unsigned long alg_k, alg_a;
120 STACK_OF(SSL_CIPHER) *cipher_stack = NULL;
122 /* See if we support any ECC ciphersuites */
123 if (s->version == SSL3_VERSION)
126 cipher_stack = SSL_get_ciphers(s);
127 end = sk_SSL_CIPHER_num(cipher_stack);
128 for (i = 0; i < end; i++) {
129 const SSL_CIPHER *c = sk_SSL_CIPHER_value(cipher_stack, i);
131 alg_k = c->algorithm_mkey;
132 alg_a = c->algorithm_auth;
133 if ((alg_k & (SSL_kECDHE | SSL_kECDHEPSK))
134 || (alg_a & SSL_aECDSA)
135 || c->min_tls >= TLS1_3_VERSION)
142 EXT_RETURN tls_construct_ctos_ec_pt_formats(SSL *s, WPACKET *pkt,
143 unsigned int context, X509 *x,
146 const unsigned char *pformats;
150 return EXT_RETURN_NOT_SENT;
152 /* Add TLS extension ECPointFormats to the ClientHello message */
153 tls1_get_formatlist(s, &pformats, &num_formats);
155 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_ec_point_formats)
156 /* Sub-packet for formats extension */
157 || !WPACKET_start_sub_packet_u16(pkt)
158 || !WPACKET_sub_memcpy_u8(pkt, pformats, num_formats)
159 || !WPACKET_close(pkt)) {
160 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
161 SSL_F_TLS_CONSTRUCT_CTOS_EC_PT_FORMATS, ERR_R_INTERNAL_ERROR);
162 return EXT_RETURN_FAIL;
165 return EXT_RETURN_SENT;
168 EXT_RETURN tls_construct_ctos_supported_groups(SSL *s, WPACKET *pkt,
169 unsigned int context, X509 *x,
172 const uint16_t *pgroups = NULL;
173 size_t num_groups = 0, i;
176 return EXT_RETURN_NOT_SENT;
179 * Add TLS extension supported_groups to the ClientHello message
181 /* TODO(TLS1.3): Add support for DHE groups */
182 tls1_get_supported_groups(s, &pgroups, &num_groups);
184 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_supported_groups)
185 /* Sub-packet for supported_groups extension */
186 || !WPACKET_start_sub_packet_u16(pkt)
187 || !WPACKET_start_sub_packet_u16(pkt)) {
188 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
189 SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_GROUPS,
190 ERR_R_INTERNAL_ERROR);
191 return EXT_RETURN_FAIL;
193 /* Copy curve ID if supported */
194 for (i = 0; i < num_groups; i++) {
195 uint16_t ctmp = pgroups[i];
197 if (tls_curve_allowed(s, ctmp, SSL_SECOP_CURVE_SUPPORTED)) {
198 if (!WPACKET_put_bytes_u16(pkt, ctmp)) {
199 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
200 SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_GROUPS,
201 ERR_R_INTERNAL_ERROR);
202 return EXT_RETURN_FAIL;
206 if (!WPACKET_close(pkt) || !WPACKET_close(pkt)) {
207 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
208 SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_GROUPS,
209 ERR_R_INTERNAL_ERROR);
210 return EXT_RETURN_FAIL;
213 return EXT_RETURN_SENT;
217 EXT_RETURN tls_construct_ctos_session_ticket(SSL *s, WPACKET *pkt,
218 unsigned int context, X509 *x,
223 if (!tls_use_ticket(s))
224 return EXT_RETURN_NOT_SENT;
226 if (!s->new_session && s->session != NULL
227 && s->session->ext.tick != NULL
228 && s->session->ssl_version != TLS1_3_VERSION) {
229 ticklen = s->session->ext.ticklen;
230 } else if (s->session && s->ext.session_ticket != NULL
231 && s->ext.session_ticket->data != NULL) {
232 ticklen = s->ext.session_ticket->length;
233 s->session->ext.tick = OPENSSL_malloc(ticklen);
234 if (s->session->ext.tick == NULL) {
235 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
236 SSL_F_TLS_CONSTRUCT_CTOS_SESSION_TICKET,
237 ERR_R_INTERNAL_ERROR);
238 return EXT_RETURN_FAIL;
240 memcpy(s->session->ext.tick,
241 s->ext.session_ticket->data, ticklen);
242 s->session->ext.ticklen = ticklen;
247 if (ticklen == 0 && s->ext.session_ticket != NULL &&
248 s->ext.session_ticket->data == NULL)
249 return EXT_RETURN_NOT_SENT;
251 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_session_ticket)
252 || !WPACKET_sub_memcpy_u16(pkt, s->session->ext.tick, ticklen)) {
253 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
254 SSL_F_TLS_CONSTRUCT_CTOS_SESSION_TICKET, ERR_R_INTERNAL_ERROR);
255 return EXT_RETURN_FAIL;
258 return EXT_RETURN_SENT;
261 EXT_RETURN tls_construct_ctos_sig_algs(SSL *s, WPACKET *pkt,
262 unsigned int context, X509 *x,
266 const uint16_t *salg;
268 if (!SSL_CLIENT_USE_SIGALGS(s))
269 return EXT_RETURN_NOT_SENT;
271 salglen = tls12_get_psigalgs(s, 1, &salg);
272 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_signature_algorithms)
273 /* Sub-packet for sig-algs extension */
274 || !WPACKET_start_sub_packet_u16(pkt)
275 /* Sub-packet for the actual list */
276 || !WPACKET_start_sub_packet_u16(pkt)
277 || !tls12_copy_sigalgs(s, pkt, salg, salglen)
278 || !WPACKET_close(pkt)
279 || !WPACKET_close(pkt)) {
280 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CTOS_SIG_ALGS,
281 ERR_R_INTERNAL_ERROR);
282 return EXT_RETURN_FAIL;
285 return EXT_RETURN_SENT;
288 #ifndef OPENSSL_NO_OCSP
289 EXT_RETURN tls_construct_ctos_status_request(SSL *s, WPACKET *pkt,
290 unsigned int context, X509 *x,
295 /* This extension isn't defined for client Certificates */
297 return EXT_RETURN_NOT_SENT;
299 if (s->ext.status_type != TLSEXT_STATUSTYPE_ocsp)
300 return EXT_RETURN_NOT_SENT;
302 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_status_request)
303 /* Sub-packet for status request extension */
304 || !WPACKET_start_sub_packet_u16(pkt)
305 || !WPACKET_put_bytes_u8(pkt, TLSEXT_STATUSTYPE_ocsp)
306 /* Sub-packet for the ids */
307 || !WPACKET_start_sub_packet_u16(pkt)) {
308 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
309 SSL_F_TLS_CONSTRUCT_CTOS_STATUS_REQUEST, ERR_R_INTERNAL_ERROR);
310 return EXT_RETURN_FAIL;
312 for (i = 0; i < sk_OCSP_RESPID_num(s->ext.ocsp.ids); i++) {
313 unsigned char *idbytes;
314 OCSP_RESPID *id = sk_OCSP_RESPID_value(s->ext.ocsp.ids, i);
315 int idlen = i2d_OCSP_RESPID(id, NULL);
318 /* Sub-packet for an individual id */
319 || !WPACKET_sub_allocate_bytes_u16(pkt, idlen, &idbytes)
320 || i2d_OCSP_RESPID(id, &idbytes) != idlen) {
321 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
322 SSL_F_TLS_CONSTRUCT_CTOS_STATUS_REQUEST,
323 ERR_R_INTERNAL_ERROR);
324 return EXT_RETURN_FAIL;
327 if (!WPACKET_close(pkt)
328 || !WPACKET_start_sub_packet_u16(pkt)) {
329 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
330 SSL_F_TLS_CONSTRUCT_CTOS_STATUS_REQUEST, ERR_R_INTERNAL_ERROR);
331 return EXT_RETURN_FAIL;
333 if (s->ext.ocsp.exts) {
334 unsigned char *extbytes;
335 int extlen = i2d_X509_EXTENSIONS(s->ext.ocsp.exts, NULL);
338 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
339 SSL_F_TLS_CONSTRUCT_CTOS_STATUS_REQUEST,
340 ERR_R_INTERNAL_ERROR);
341 return EXT_RETURN_FAIL;
343 if (!WPACKET_allocate_bytes(pkt, extlen, &extbytes)
344 || i2d_X509_EXTENSIONS(s->ext.ocsp.exts, &extbytes)
346 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
347 SSL_F_TLS_CONSTRUCT_CTOS_STATUS_REQUEST,
348 ERR_R_INTERNAL_ERROR);
349 return EXT_RETURN_FAIL;
352 if (!WPACKET_close(pkt) || !WPACKET_close(pkt)) {
353 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
354 SSL_F_TLS_CONSTRUCT_CTOS_STATUS_REQUEST, ERR_R_INTERNAL_ERROR);
355 return EXT_RETURN_FAIL;
358 return EXT_RETURN_SENT;
362 #ifndef OPENSSL_NO_NEXTPROTONEG
363 EXT_RETURN tls_construct_ctos_npn(SSL *s, WPACKET *pkt, unsigned int context,
364 X509 *x, size_t chainidx)
366 if (s->ctx->ext.npn_select_cb == NULL || !SSL_IS_FIRST_HANDSHAKE(s))
367 return EXT_RETURN_NOT_SENT;
370 * The client advertises an empty extension to indicate its support
371 * for Next Protocol Negotiation
373 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_next_proto_neg)
374 || !WPACKET_put_bytes_u16(pkt, 0)) {
375 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CTOS_NPN,
376 ERR_R_INTERNAL_ERROR);
377 return EXT_RETURN_FAIL;
380 return EXT_RETURN_SENT;
384 EXT_RETURN tls_construct_ctos_alpn(SSL *s, WPACKET *pkt, unsigned int context,
385 X509 *x, size_t chainidx)
387 s->s3->alpn_sent = 0;
389 if (s->ext.alpn == NULL || !SSL_IS_FIRST_HANDSHAKE(s))
390 return EXT_RETURN_NOT_SENT;
392 if (!WPACKET_put_bytes_u16(pkt,
393 TLSEXT_TYPE_application_layer_protocol_negotiation)
394 /* Sub-packet ALPN extension */
395 || !WPACKET_start_sub_packet_u16(pkt)
396 || !WPACKET_sub_memcpy_u16(pkt, s->ext.alpn, s->ext.alpn_len)
397 || !WPACKET_close(pkt)) {
398 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CTOS_ALPN,
399 ERR_R_INTERNAL_ERROR);
400 return EXT_RETURN_FAIL;
402 s->s3->alpn_sent = 1;
404 return EXT_RETURN_SENT;
408 #ifndef OPENSSL_NO_SRTP
409 EXT_RETURN tls_construct_ctos_use_srtp(SSL *s, WPACKET *pkt,
410 unsigned int context, X509 *x,
413 STACK_OF(SRTP_PROTECTION_PROFILE) *clnt = SSL_get_srtp_profiles(s);
417 return EXT_RETURN_NOT_SENT;
419 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_use_srtp)
420 /* Sub-packet for SRTP extension */
421 || !WPACKET_start_sub_packet_u16(pkt)
422 /* Sub-packet for the protection profile list */
423 || !WPACKET_start_sub_packet_u16(pkt)) {
424 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CTOS_USE_SRTP,
425 ERR_R_INTERNAL_ERROR);
426 return EXT_RETURN_FAIL;
429 end = sk_SRTP_PROTECTION_PROFILE_num(clnt);
430 for (i = 0; i < end; i++) {
431 const SRTP_PROTECTION_PROFILE *prof =
432 sk_SRTP_PROTECTION_PROFILE_value(clnt, i);
434 if (prof == NULL || !WPACKET_put_bytes_u16(pkt, prof->id)) {
435 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
436 SSL_F_TLS_CONSTRUCT_CTOS_USE_SRTP, ERR_R_INTERNAL_ERROR);
437 return EXT_RETURN_FAIL;
440 if (!WPACKET_close(pkt)
441 /* Add an empty use_mki value */
442 || !WPACKET_put_bytes_u8(pkt, 0)
443 || !WPACKET_close(pkt)) {
444 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CTOS_USE_SRTP,
445 ERR_R_INTERNAL_ERROR);
446 return EXT_RETURN_FAIL;
449 return EXT_RETURN_SENT;
453 EXT_RETURN tls_construct_ctos_etm(SSL *s, WPACKET *pkt, unsigned int context,
454 X509 *x, size_t chainidx)
456 if (s->options & SSL_OP_NO_ENCRYPT_THEN_MAC)
457 return EXT_RETURN_NOT_SENT;
459 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_encrypt_then_mac)
460 || !WPACKET_put_bytes_u16(pkt, 0)) {
461 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CTOS_ETM,
462 ERR_R_INTERNAL_ERROR);
463 return EXT_RETURN_FAIL;
466 return EXT_RETURN_SENT;
469 #ifndef OPENSSL_NO_CT
470 EXT_RETURN tls_construct_ctos_sct(SSL *s, WPACKET *pkt, unsigned int context,
471 X509 *x, size_t chainidx)
473 if (s->ct_validation_callback == NULL)
474 return EXT_RETURN_NOT_SENT;
476 /* Not defined for client Certificates */
478 return EXT_RETURN_NOT_SENT;
480 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_signed_certificate_timestamp)
481 || !WPACKET_put_bytes_u16(pkt, 0)) {
482 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CTOS_SCT,
483 ERR_R_INTERNAL_ERROR);
484 return EXT_RETURN_FAIL;
487 return EXT_RETURN_SENT;
491 EXT_RETURN tls_construct_ctos_ems(SSL *s, WPACKET *pkt, unsigned int context,
492 X509 *x, size_t chainidx)
494 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_extended_master_secret)
495 || !WPACKET_put_bytes_u16(pkt, 0)) {
496 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CTOS_EMS,
497 ERR_R_INTERNAL_ERROR);
498 return EXT_RETURN_FAIL;
501 return EXT_RETURN_SENT;
504 EXT_RETURN tls_construct_ctos_supported_versions(SSL *s, WPACKET *pkt,
505 unsigned int context, X509 *x,
508 int currv, min_version, max_version, reason;
510 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_supported_versions)
511 || !WPACKET_start_sub_packet_u16(pkt)
512 || !WPACKET_start_sub_packet_u8(pkt)) {
513 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
514 SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_VERSIONS,
515 ERR_R_INTERNAL_ERROR);
516 return EXT_RETURN_FAIL;
519 reason = ssl_get_min_max_version(s, &min_version, &max_version);
521 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
522 SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_VERSIONS, reason);
523 return EXT_RETURN_FAIL;
527 * TODO(TLS1.3): There is some discussion on the TLS list as to whether
528 * we should include versions <TLS1.2. For the moment we do. To be
531 for (currv = max_version; currv >= min_version; currv--) {
532 /* TODO(TLS1.3): Remove this first if clause prior to release!! */
533 if (currv == TLS1_3_VERSION) {
534 if (!WPACKET_put_bytes_u16(pkt, TLS1_3_VERSION_DRAFT)) {
535 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
536 SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_VERSIONS,
537 ERR_R_INTERNAL_ERROR);
538 return EXT_RETURN_FAIL;
540 } else if (!WPACKET_put_bytes_u16(pkt, currv)) {
541 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
542 SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_VERSIONS,
543 ERR_R_INTERNAL_ERROR);
544 return EXT_RETURN_FAIL;
547 if (!WPACKET_close(pkt) || !WPACKET_close(pkt)) {
548 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
549 SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_VERSIONS,
550 ERR_R_INTERNAL_ERROR);
551 return EXT_RETURN_FAIL;
554 return EXT_RETURN_SENT;
558 * Construct a psk_kex_modes extension.
560 EXT_RETURN tls_construct_ctos_psk_kex_modes(SSL *s, WPACKET *pkt,
561 unsigned int context, X509 *x,
564 #ifndef OPENSSL_NO_TLS1_3
565 int nodhe = s->options & SSL_OP_ALLOW_NO_DHE_KEX;
567 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_psk_kex_modes)
568 || !WPACKET_start_sub_packet_u16(pkt)
569 || !WPACKET_start_sub_packet_u8(pkt)
570 || !WPACKET_put_bytes_u8(pkt, TLSEXT_KEX_MODE_KE_DHE)
571 || (nodhe && !WPACKET_put_bytes_u8(pkt, TLSEXT_KEX_MODE_KE))
572 || !WPACKET_close(pkt)
573 || !WPACKET_close(pkt)) {
574 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
575 SSL_F_TLS_CONSTRUCT_CTOS_PSK_KEX_MODES, ERR_R_INTERNAL_ERROR);
576 return EXT_RETURN_FAIL;
579 s->ext.psk_kex_mode = TLSEXT_KEX_MODE_FLAG_KE_DHE;
581 s->ext.psk_kex_mode |= TLSEXT_KEX_MODE_FLAG_KE;
584 return EXT_RETURN_SENT;
587 #ifndef OPENSSL_NO_TLS1_3
588 static int add_key_share(SSL *s, WPACKET *pkt, unsigned int curve_id)
590 unsigned char *encoded_point = NULL;
591 EVP_PKEY *key_share_key = NULL;
594 if (s->s3->tmp.pkey != NULL) {
595 if (!ossl_assert(s->hello_retry_request)) {
596 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_ADD_KEY_SHARE,
597 ERR_R_INTERNAL_ERROR);
601 * Could happen if we got an HRR that wasn't requesting a new key_share
603 key_share_key = s->s3->tmp.pkey;
605 key_share_key = ssl_generate_pkey_group(s, curve_id);
606 if (key_share_key == NULL) {
607 /* SSLfatal() already called */
612 /* Encode the public key. */
613 encodedlen = EVP_PKEY_get1_tls_encodedpoint(key_share_key,
615 if (encodedlen == 0) {
616 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_ADD_KEY_SHARE, ERR_R_EC_LIB);
620 /* Create KeyShareEntry */
621 if (!WPACKET_put_bytes_u16(pkt, curve_id)
622 || !WPACKET_sub_memcpy_u16(pkt, encoded_point, encodedlen)) {
623 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_ADD_KEY_SHARE,
624 ERR_R_INTERNAL_ERROR);
629 * TODO(TLS1.3): When changing to send more than one key_share we're
630 * going to need to be able to save more than one EVP_PKEY. For now
631 * we reuse the existing tmp.pkey
633 s->s3->tmp.pkey = key_share_key;
634 s->s3->group_id = curve_id;
635 OPENSSL_free(encoded_point);
639 if (s->s3->tmp.pkey == NULL)
640 EVP_PKEY_free(key_share_key);
641 OPENSSL_free(encoded_point);
646 EXT_RETURN tls_construct_ctos_key_share(SSL *s, WPACKET *pkt,
647 unsigned int context, X509 *x,
650 #ifndef OPENSSL_NO_TLS1_3
651 size_t i, num_groups = 0;
652 const uint16_t *pgroups = NULL;
653 uint16_t curve_id = 0;
655 /* key_share extension */
656 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_key_share)
657 /* Extension data sub-packet */
658 || !WPACKET_start_sub_packet_u16(pkt)
659 /* KeyShare list sub-packet */
660 || !WPACKET_start_sub_packet_u16(pkt)) {
661 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CTOS_KEY_SHARE,
662 ERR_R_INTERNAL_ERROR);
663 return EXT_RETURN_FAIL;
666 tls1_get_supported_groups(s, &pgroups, &num_groups);
669 * TODO(TLS1.3): Make the number of key_shares sent configurable. For
672 if (s->s3->group_id != 0) {
673 curve_id = s->s3->group_id;
675 for (i = 0; i < num_groups; i++) {
677 if (!tls_curve_allowed(s, pgroups[i], SSL_SECOP_CURVE_SUPPORTED))
680 curve_id = pgroups[i];
686 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CTOS_KEY_SHARE,
687 SSL_R_NO_SUITABLE_KEY_SHARE);
688 return EXT_RETURN_FAIL;
691 if (!add_key_share(s, pkt, curve_id)) {
692 /* SSLfatal() already called */
693 return EXT_RETURN_FAIL;
696 if (!WPACKET_close(pkt) || !WPACKET_close(pkt)) {
697 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CTOS_KEY_SHARE,
698 ERR_R_INTERNAL_ERROR);
699 return EXT_RETURN_FAIL;
703 return EXT_RETURN_SENT;
706 EXT_RETURN tls_construct_ctos_cookie(SSL *s, WPACKET *pkt, unsigned int context,
707 X509 *x, size_t chainidx)
709 EXT_RETURN ret = EXT_RETURN_FAIL;
711 /* Should only be set if we've had an HRR */
712 if (s->ext.tls13_cookie_len == 0)
713 return EXT_RETURN_NOT_SENT;
715 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_cookie)
716 /* Extension data sub-packet */
717 || !WPACKET_start_sub_packet_u16(pkt)
718 || !WPACKET_sub_memcpy_u16(pkt, s->ext.tls13_cookie,
719 s->ext.tls13_cookie_len)
720 || !WPACKET_close(pkt)) {
721 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CTOS_COOKIE,
722 ERR_R_INTERNAL_ERROR);
726 ret = EXT_RETURN_SENT;
728 OPENSSL_free(s->ext.tls13_cookie);
729 s->ext.tls13_cookie = NULL;
730 s->ext.tls13_cookie_len = 0;
735 EXT_RETURN tls_construct_ctos_early_data(SSL *s, WPACKET *pkt,
736 unsigned int context, X509 *x,
739 const unsigned char *id = NULL;
741 SSL_SESSION *psksess = NULL;
742 SSL_SESSION *edsess = NULL;
743 const EVP_MD *handmd = NULL;
745 if (s->hello_retry_request)
746 handmd = ssl_handshake_md(s);
748 if (s->psk_use_session_cb != NULL
749 && (!s->psk_use_session_cb(s, handmd, &id, &idlen, &psksess)
751 && psksess->ssl_version != TLS1_3_VERSION))) {
752 SSL_SESSION_free(psksess);
753 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CTOS_EARLY_DATA,
755 return EXT_RETURN_FAIL;
758 SSL_SESSION_free(s->psksession);
759 s->psksession = psksess;
760 if (psksess != NULL) {
761 OPENSSL_free(s->psksession_id);
762 s->psksession_id = OPENSSL_memdup(id, idlen);
763 if (s->psksession_id == NULL) {
764 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
765 SSL_F_TLS_CONSTRUCT_CTOS_EARLY_DATA, ERR_R_INTERNAL_ERROR);
766 return EXT_RETURN_FAIL;
768 s->psksession_id_len = idlen;
771 if (s->early_data_state != SSL_EARLY_DATA_CONNECTING
772 || (s->session->ext.max_early_data == 0
773 && (psksess == NULL || psksess->ext.max_early_data == 0))) {
774 s->max_early_data = 0;
775 return EXT_RETURN_NOT_SENT;
777 edsess = s->session->ext.max_early_data != 0 ? s->session : psksess;
778 s->max_early_data = edsess->ext.max_early_data;
780 if (edsess->ext.hostname != NULL) {
781 if (s->ext.hostname == NULL
782 || (s->ext.hostname != NULL
783 && strcmp(s->ext.hostname, edsess->ext.hostname) != 0)) {
784 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
785 SSL_F_TLS_CONSTRUCT_CTOS_EARLY_DATA,
786 SSL_R_INCONSISTENT_EARLY_DATA_SNI);
787 return EXT_RETURN_FAIL;
791 if ((s->ext.alpn == NULL && edsess->ext.alpn_selected != NULL)) {
792 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CTOS_EARLY_DATA,
793 SSL_R_INCONSISTENT_EARLY_DATA_ALPN);
794 return EXT_RETURN_FAIL;
798 * Verify that we are offering an ALPN protocol consistent with the early
801 if (edsess->ext.alpn_selected != NULL) {
802 PACKET prots, alpnpkt;
805 if (!PACKET_buf_init(&prots, s->ext.alpn, s->ext.alpn_len)) {
806 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
807 SSL_F_TLS_CONSTRUCT_CTOS_EARLY_DATA, ERR_R_INTERNAL_ERROR);
808 return EXT_RETURN_FAIL;
810 while (PACKET_get_length_prefixed_1(&prots, &alpnpkt)) {
811 if (PACKET_equal(&alpnpkt, edsess->ext.alpn_selected,
812 edsess->ext.alpn_selected_len)) {
818 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
819 SSL_F_TLS_CONSTRUCT_CTOS_EARLY_DATA,
820 SSL_R_INCONSISTENT_EARLY_DATA_ALPN);
821 return EXT_RETURN_FAIL;
825 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_early_data)
826 || !WPACKET_start_sub_packet_u16(pkt)
827 || !WPACKET_close(pkt)) {
828 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CTOS_EARLY_DATA,
829 ERR_R_INTERNAL_ERROR);
830 return EXT_RETURN_FAIL;
834 * We set this to rejected here. Later, if the server acknowledges the
835 * extension, we set it to accepted.
837 s->ext.early_data = SSL_EARLY_DATA_REJECTED;
838 s->ext.early_data_ok = 1;
840 return EXT_RETURN_SENT;
843 #define F5_WORKAROUND_MIN_MSG_LEN 0xff
844 #define F5_WORKAROUND_MAX_MSG_LEN 0x200
847 * PSK pre binder overhead =
848 * 2 bytes for TLSEXT_TYPE_psk
849 * 2 bytes for extension length
850 * 2 bytes for identities list length
851 * 2 bytes for identity length
852 * 4 bytes for obfuscated_ticket_age
853 * 2 bytes for binder list length
854 * 1 byte for binder length
855 * The above excludes the number of bytes for the identity itself and the
856 * subsequent binder bytes
858 #define PSK_PRE_BINDER_OVERHEAD (2 + 2 + 2 + 2 + 4 + 2 + 1)
860 EXT_RETURN tls_construct_ctos_padding(SSL *s, WPACKET *pkt,
861 unsigned int context, X509 *x,
864 unsigned char *padbytes;
867 if ((s->options & SSL_OP_TLSEXT_PADDING) == 0)
868 return EXT_RETURN_NOT_SENT;
871 * Add padding to workaround bugs in F5 terminators. See RFC7685.
872 * This code calculates the length of all extensions added so far but
873 * excludes the PSK extension (because that MUST be written last). Therefore
874 * this extension MUST always appear second to last.
876 if (!WPACKET_get_total_written(pkt, &hlen)) {
877 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CTOS_PADDING,
878 ERR_R_INTERNAL_ERROR);
879 return EXT_RETURN_FAIL;
883 * If we're going to send a PSK then that will be written out after this
884 * extension, so we need to calculate how long it is going to be.
886 if (s->session->ssl_version == TLS1_3_VERSION
887 && s->session->ext.ticklen != 0
888 && s->session->cipher != NULL) {
889 const EVP_MD *md = ssl_md(s->session->cipher->algorithm2);
893 * Add the fixed PSK overhead, the identity length and the binder
896 hlen += PSK_PRE_BINDER_OVERHEAD + s->session->ext.ticklen
901 if (hlen > F5_WORKAROUND_MIN_MSG_LEN && hlen < F5_WORKAROUND_MAX_MSG_LEN) {
902 /* Calculate the amount of padding we need to add */
903 hlen = F5_WORKAROUND_MAX_MSG_LEN - hlen;
906 * Take off the size of extension header itself (2 bytes for type and
907 * 2 bytes for length bytes), but ensure that the extension is at least
908 * 1 byte long so as not to have an empty extension last (WebSphere 7.x,
909 * 8.x are intolerant of that condition)
916 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_padding)
917 || !WPACKET_sub_allocate_bytes_u16(pkt, hlen, &padbytes)) {
918 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CTOS_PADDING,
919 ERR_R_INTERNAL_ERROR);
920 return EXT_RETURN_FAIL;
922 memset(padbytes, 0, hlen);
925 return EXT_RETURN_SENT;
929 * Construct the pre_shared_key extension
931 EXT_RETURN tls_construct_ctos_psk(SSL *s, WPACKET *pkt, unsigned int context,
932 X509 *x, size_t chainidx)
934 #ifndef OPENSSL_NO_TLS1_3
935 uint32_t now, agesec, agems = 0;
936 size_t reshashsize = 0, pskhashsize = 0, binderoffset, msglen;
937 unsigned char *resbinder = NULL, *pskbinder = NULL, *msgstart = NULL;
938 const EVP_MD *handmd = NULL, *mdres = NULL, *mdpsk = NULL;
941 s->session->ext.tick_identity = TLSEXT_PSK_BAD_IDENTITY;
944 * Note: At this stage of the code we only support adding a single
945 * resumption PSK. If we add support for multiple PSKs then the length
946 * calculations in the padding extension will need to be adjusted.
950 * If this is an incompatible or new session then we have nothing to resume
951 * so don't add this extension.
953 if (s->session->ssl_version != TLS1_3_VERSION
954 || (s->session->ext.ticklen == 0 && s->psksession == NULL))
955 return EXT_RETURN_NOT_SENT;
957 if (s->hello_retry_request)
958 handmd = ssl_handshake_md(s);
960 if (s->session->ext.ticklen != 0) {
961 /* Get the digest associated with the ciphersuite in the session */
962 if (s->session->cipher == NULL) {
963 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CTOS_PSK,
964 ERR_R_INTERNAL_ERROR);
965 return EXT_RETURN_FAIL;
967 mdres = ssl_md(s->session->cipher->algorithm2);
970 * Don't recognize this cipher so we can't use the session.
976 if (s->hello_retry_request && mdres != handmd) {
978 * Selected ciphersuite hash does not match the hash for the session
979 * so we can't use it.
985 * Technically the C standard just says time() returns a time_t and says
986 * nothing about the encoding of that type. In practice most
987 * implementations follow POSIX which holds it as an integral type in
988 * seconds since epoch. We've already made the assumption that we can do
989 * this in multiple places in the code, so portability shouldn't be an
992 now = (uint32_t)time(NULL);
993 agesec = now - (uint32_t)s->session->time;
995 if (s->session->ext.tick_lifetime_hint < agesec) {
996 /* Ticket is too old. Ignore it. */
1001 * Calculate age in ms. We're just doing it to nearest second. Should be
1004 agems = agesec * (uint32_t)1000;
1006 if (agesec != 0 && agems / (uint32_t)1000 != agesec) {
1008 * Overflow. Shouldn't happen unless this is a *really* old session.
1009 * If so we just ignore it.
1015 * Obfuscate the age. Overflow here is fine, this addition is supposed
1018 agems += s->session->ext.tick_age_add;
1020 reshashsize = EVP_MD_size(mdres);
1025 if (!dores && s->psksession == NULL)
1026 return EXT_RETURN_NOT_SENT;
1028 if (s->psksession != NULL) {
1029 mdpsk = ssl_md(s->psksession->cipher->algorithm2);
1030 if (mdpsk == NULL) {
1032 * Don't recognize this cipher so we can't use the session.
1033 * If this happens it's an application bug.
1035 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CTOS_PSK,
1037 return EXT_RETURN_FAIL;
1040 if (s->hello_retry_request && mdpsk != handmd) {
1042 * Selected ciphersuite hash does not match the hash for the PSK
1043 * session. This is an application bug.
1045 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CTOS_PSK,
1047 return EXT_RETURN_FAIL;
1050 pskhashsize = EVP_MD_size(mdpsk);
1053 /* Create the extension, but skip over the binder for now */
1054 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_psk)
1055 || !WPACKET_start_sub_packet_u16(pkt)
1056 || !WPACKET_start_sub_packet_u16(pkt)) {
1057 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CTOS_PSK,
1058 ERR_R_INTERNAL_ERROR);
1059 return EXT_RETURN_FAIL;
1063 if (!WPACKET_sub_memcpy_u16(pkt, s->session->ext.tick,
1064 s->session->ext.ticklen)
1065 || !WPACKET_put_bytes_u32(pkt, agems)) {
1066 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CTOS_PSK,
1067 ERR_R_INTERNAL_ERROR);
1068 return EXT_RETURN_FAIL;
1072 if (s->psksession != NULL) {
1073 if (!WPACKET_sub_memcpy_u16(pkt, s->psksession_id,
1074 s->psksession_id_len)
1075 || !WPACKET_put_bytes_u32(pkt, 0)) {
1076 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CTOS_PSK,
1077 ERR_R_INTERNAL_ERROR);
1078 return EXT_RETURN_FAIL;
1082 if (!WPACKET_close(pkt)
1083 || !WPACKET_get_total_written(pkt, &binderoffset)
1084 || !WPACKET_start_sub_packet_u16(pkt)
1086 && !WPACKET_sub_allocate_bytes_u8(pkt, reshashsize, &resbinder))
1087 || (s->psksession != NULL
1088 && !WPACKET_sub_allocate_bytes_u8(pkt, pskhashsize, &pskbinder))
1089 || !WPACKET_close(pkt)
1090 || !WPACKET_close(pkt)
1091 || !WPACKET_get_total_written(pkt, &msglen)
1093 * We need to fill in all the sub-packet lengths now so we can
1094 * calculate the HMAC of the message up to the binders
1096 || !WPACKET_fill_lengths(pkt)) {
1097 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CTOS_PSK,
1098 ERR_R_INTERNAL_ERROR);
1099 return EXT_RETURN_FAIL;
1102 msgstart = WPACKET_get_curr(pkt) - msglen;
1105 && tls_psk_do_binder(s, mdres, msgstart, binderoffset, NULL,
1106 resbinder, s->session, 1, 0) != 1) {
1107 /* SSLfatal() already called */
1108 return EXT_RETURN_FAIL;
1111 if (s->psksession != NULL
1112 && tls_psk_do_binder(s, mdpsk, msgstart, binderoffset, NULL,
1113 pskbinder, s->psksession, 1, 1) != 1) {
1114 /* SSLfatal() already called */
1115 return EXT_RETURN_FAIL;
1119 s->session->ext.tick_identity = 0;
1120 if (s->psksession != NULL)
1121 s->psksession->ext.tick_identity = (dores ? 1 : 0);
1123 return EXT_RETURN_SENT;
1125 return EXT_RETURN_NOT_SENT;
1130 * Parse the server's renegotiation binding and abort if it's not right
1132 int tls_parse_stoc_renegotiate(SSL *s, PACKET *pkt, unsigned int context,
1133 X509 *x, size_t chainidx)
1135 size_t expected_len = s->s3->previous_client_finished_len
1136 + s->s3->previous_server_finished_len;
1138 const unsigned char *data;
1140 /* Check for logic errors */
1141 if (!ossl_assert(expected_len == 0
1142 || s->s3->previous_client_finished_len != 0)
1143 || !ossl_assert(expected_len == 0
1144 || s->s3->previous_server_finished_len != 0)) {
1145 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PARSE_STOC_RENEGOTIATE,
1146 ERR_R_INTERNAL_ERROR);
1150 /* Parse the length byte */
1151 if (!PACKET_get_1_len(pkt, &ilen)) {
1152 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PARSE_STOC_RENEGOTIATE,
1153 SSL_R_RENEGOTIATION_ENCODING_ERR);
1157 /* Consistency check */
1158 if (PACKET_remaining(pkt) != ilen) {
1159 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PARSE_STOC_RENEGOTIATE,
1160 SSL_R_RENEGOTIATION_ENCODING_ERR);
1164 /* Check that the extension matches */
1165 if (ilen != expected_len) {
1166 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_F_TLS_PARSE_STOC_RENEGOTIATE,
1167 SSL_R_RENEGOTIATION_MISMATCH);
1171 if (!PACKET_get_bytes(pkt, &data, s->s3->previous_client_finished_len)
1172 || memcmp(data, s->s3->previous_client_finished,
1173 s->s3->previous_client_finished_len) != 0) {
1174 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_F_TLS_PARSE_STOC_RENEGOTIATE,
1175 SSL_R_RENEGOTIATION_MISMATCH);
1179 if (!PACKET_get_bytes(pkt, &data, s->s3->previous_server_finished_len)
1180 || memcmp(data, s->s3->previous_server_finished,
1181 s->s3->previous_server_finished_len) != 0) {
1182 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_F_TLS_PARSE_STOC_RENEGOTIATE,
1183 SSL_R_RENEGOTIATION_MISMATCH);
1186 s->s3->send_connection_binding = 1;
1191 /* Parse the server's max fragment len extension packet */
1192 int tls_parse_stoc_maxfragmentlen(SSL *s, PACKET *pkt, unsigned int context,
1193 X509 *x, size_t chainidx)
1197 if (PACKET_remaining(pkt) != 1 || !PACKET_get_1(pkt, &value)) {
1198 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PARSE_STOC_MAXFRAGMENTLEN,
1199 SSL_R_BAD_EXTENSION);
1203 /* |value| should contains a valid max-fragment-length code. */
1204 if (!IS_MAX_FRAGMENT_LENGTH_EXT_VALID(value)) {
1205 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER,
1206 SSL_F_TLS_PARSE_STOC_MAXFRAGMENTLEN,
1207 SSL_R_SSL3_EXT_INVALID_MAX_FRAGMENT_LENGTH);
1211 /* Must be the same value as client-configured one who was sent to server */
1213 * RFC 6066: if a client receives a maximum fragment length negotiation
1214 * response that differs from the length it requested, ...
1215 * It must abort with SSL_AD_ILLEGAL_PARAMETER alert
1217 if (value != s->ext.max_fragment_len_mode) {
1218 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER,
1219 SSL_F_TLS_PARSE_STOC_MAXFRAGMENTLEN,
1220 SSL_R_SSL3_EXT_INVALID_MAX_FRAGMENT_LENGTH);
1225 * Maximum Fragment Length Negotiation succeeded.
1226 * The negotiated Maximum Fragment Length is binding now.
1228 s->session->ext.max_fragment_len_mode = value;
1233 int tls_parse_stoc_server_name(SSL *s, PACKET *pkt, unsigned int context,
1234 X509 *x, size_t chainidx)
1236 if (s->ext.hostname == NULL) {
1237 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PARSE_STOC_SERVER_NAME,
1238 ERR_R_INTERNAL_ERROR);
1242 if (PACKET_remaining(pkt) > 0) {
1243 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PARSE_STOC_SERVER_NAME,
1244 SSL_R_BAD_EXTENSION);
1249 if (s->session->ext.hostname != NULL) {
1250 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PARSE_STOC_SERVER_NAME,
1251 ERR_R_INTERNAL_ERROR);
1254 s->session->ext.hostname = OPENSSL_strdup(s->ext.hostname);
1255 if (s->session->ext.hostname == NULL) {
1256 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PARSE_STOC_SERVER_NAME,
1257 ERR_R_INTERNAL_ERROR);
1265 #ifndef OPENSSL_NO_EC
1266 int tls_parse_stoc_ec_pt_formats(SSL *s, PACKET *pkt, unsigned int context,
1267 X509 *x, size_t chainidx)
1269 unsigned int ecpointformats_len;
1270 PACKET ecptformatlist;
1272 if (!PACKET_as_length_prefixed_1(pkt, &ecptformatlist)) {
1273 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PARSE_STOC_EC_PT_FORMATS,
1274 SSL_R_BAD_EXTENSION);
1278 ecpointformats_len = PACKET_remaining(&ecptformatlist);
1279 s->session->ext.ecpointformats_len = 0;
1281 OPENSSL_free(s->session->ext.ecpointformats);
1282 s->session->ext.ecpointformats = OPENSSL_malloc(ecpointformats_len);
1283 if (s->session->ext.ecpointformats == NULL) {
1284 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
1285 SSL_F_TLS_PARSE_STOC_EC_PT_FORMATS, ERR_R_INTERNAL_ERROR);
1289 s->session->ext.ecpointformats_len = ecpointformats_len;
1291 if (!PACKET_copy_bytes(&ecptformatlist,
1292 s->session->ext.ecpointformats,
1293 ecpointformats_len)) {
1294 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
1295 SSL_F_TLS_PARSE_STOC_EC_PT_FORMATS, ERR_R_INTERNAL_ERROR);
1304 int tls_parse_stoc_session_ticket(SSL *s, PACKET *pkt, unsigned int context,
1305 X509 *x, size_t chainidx)
1307 if (s->ext.session_ticket_cb != NULL &&
1308 !s->ext.session_ticket_cb(s, PACKET_data(pkt),
1309 PACKET_remaining(pkt),
1310 s->ext.session_ticket_cb_arg)) {
1311 SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE,
1312 SSL_F_TLS_PARSE_STOC_SESSION_TICKET, SSL_R_BAD_EXTENSION);
1316 if (!tls_use_ticket(s)) {
1317 SSLfatal(s, SSL_AD_UNSUPPORTED_EXTENSION,
1318 SSL_F_TLS_PARSE_STOC_SESSION_TICKET, SSL_R_BAD_EXTENSION);
1321 if (PACKET_remaining(pkt) > 0) {
1322 SSLfatal(s, SSL_AD_DECODE_ERROR,
1323 SSL_F_TLS_PARSE_STOC_SESSION_TICKET, SSL_R_BAD_EXTENSION);
1327 s->ext.ticket_expected = 1;
1332 #ifndef OPENSSL_NO_OCSP
1333 int tls_parse_stoc_status_request(SSL *s, PACKET *pkt, unsigned int context,
1334 X509 *x, size_t chainidx)
1337 * MUST only be sent if we've requested a status
1338 * request message. In TLS <= 1.2 it must also be empty.
1340 if (s->ext.status_type != TLSEXT_STATUSTYPE_ocsp) {
1341 SSLfatal(s, SSL_AD_UNSUPPORTED_EXTENSION,
1342 SSL_F_TLS_PARSE_STOC_STATUS_REQUEST, SSL_R_BAD_EXTENSION);
1345 if (!SSL_IS_TLS13(s) && PACKET_remaining(pkt) > 0) {
1346 SSLfatal(s, SSL_AD_DECODE_ERROR,
1347 SSL_F_TLS_PARSE_STOC_STATUS_REQUEST, SSL_R_BAD_EXTENSION);
1351 if (SSL_IS_TLS13(s)) {
1352 /* We only know how to handle this if it's for the first Certificate in
1353 * the chain. We ignore any other responses.
1358 /* SSLfatal() already called */
1359 return tls_process_cert_status_body(s, pkt);
1362 /* Set flag to expect CertificateStatus message */
1363 s->ext.status_expected = 1;
1370 #ifndef OPENSSL_NO_CT
1371 int tls_parse_stoc_sct(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
1375 * Only take it if we asked for it - i.e if there is no CT validation
1376 * callback set, then a custom extension MAY be processing it, so we
1377 * need to let control continue to flow to that.
1379 if (s->ct_validation_callback != NULL) {
1380 size_t size = PACKET_remaining(pkt);
1382 /* Simply copy it off for later processing */
1383 OPENSSL_free(s->ext.scts);
1386 s->ext.scts_len = (uint16_t)size;
1388 s->ext.scts = OPENSSL_malloc(size);
1389 if (s->ext.scts == NULL
1390 || !PACKET_copy_bytes(pkt, s->ext.scts, size)) {
1391 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PARSE_STOC_SCT,
1392 ERR_R_INTERNAL_ERROR);
1397 ENDPOINT role = (context & SSL_EXT_TLS1_2_SERVER_HELLO) != 0
1398 ? ENDPOINT_CLIENT : ENDPOINT_BOTH;
1401 * If we didn't ask for it then there must be a custom extension,
1402 * otherwise this is unsolicited.
1404 if (custom_ext_find(&s->cert->custext, role,
1405 TLSEXT_TYPE_signed_certificate_timestamp,
1407 SSLfatal(s, TLS1_AD_UNSUPPORTED_EXTENSION, SSL_F_TLS_PARSE_STOC_SCT,
1408 SSL_R_BAD_EXTENSION);
1412 if (!custom_ext_parse(s, context,
1413 TLSEXT_TYPE_signed_certificate_timestamp,
1414 PACKET_data(pkt), PACKET_remaining(pkt),
1416 /* SSLfatal already called */
1426 #ifndef OPENSSL_NO_NEXTPROTONEG
1428 * ssl_next_proto_validate validates a Next Protocol Negotiation block. No
1429 * elements of zero length are allowed and the set of elements must exactly
1430 * fill the length of the block. Returns 1 on success or 0 on failure.
1432 static int ssl_next_proto_validate(SSL *s, PACKET *pkt)
1434 PACKET tmp_protocol;
1436 while (PACKET_remaining(pkt)) {
1437 if (!PACKET_get_length_prefixed_1(pkt, &tmp_protocol)
1438 || PACKET_remaining(&tmp_protocol) == 0) {
1439 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_SSL_NEXT_PROTO_VALIDATE,
1440 SSL_R_BAD_EXTENSION);
1448 int tls_parse_stoc_npn(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
1451 unsigned char *selected;
1452 unsigned char selected_len;
1455 /* Check if we are in a renegotiation. If so ignore this extension */
1456 if (!SSL_IS_FIRST_HANDSHAKE(s))
1459 /* We must have requested it. */
1460 if (s->ctx->ext.npn_select_cb == NULL) {
1461 SSLfatal(s, SSL_AD_UNSUPPORTED_EXTENSION, SSL_F_TLS_PARSE_STOC_NPN,
1462 SSL_R_BAD_EXTENSION);
1466 /* The data must be valid */
1468 if (!ssl_next_proto_validate(s, &tmppkt)) {
1469 /* SSLfatal() already called */
1472 if (s->ctx->ext.npn_select_cb(s, &selected, &selected_len,
1474 PACKET_remaining(pkt),
1475 s->ctx->ext.npn_select_cb_arg) !=
1476 SSL_TLSEXT_ERR_OK) {
1477 SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE, SSL_F_TLS_PARSE_STOC_NPN,
1478 SSL_R_BAD_EXTENSION);
1483 * Could be non-NULL if server has sent multiple NPN extensions in
1484 * a single Serverhello
1486 OPENSSL_free(s->ext.npn);
1487 s->ext.npn = OPENSSL_malloc(selected_len);
1488 if (s->ext.npn == NULL) {
1489 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PARSE_STOC_NPN,
1490 ERR_R_INTERNAL_ERROR);
1494 memcpy(s->ext.npn, selected, selected_len);
1495 s->ext.npn_len = selected_len;
1496 s->s3->npn_seen = 1;
1502 int tls_parse_stoc_alpn(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
1507 /* We must have requested it. */
1508 if (!s->s3->alpn_sent) {
1509 SSLfatal(s, SSL_AD_UNSUPPORTED_EXTENSION, SSL_F_TLS_PARSE_STOC_ALPN,
1510 SSL_R_BAD_EXTENSION);
1514 * The extension data consists of:
1515 * uint16 list_length
1516 * uint8 proto_length;
1517 * uint8 proto[proto_length];
1519 if (!PACKET_get_net_2_len(pkt, &len)
1520 || PACKET_remaining(pkt) != len || !PACKET_get_1_len(pkt, &len)
1521 || PACKET_remaining(pkt) != len) {
1522 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PARSE_STOC_ALPN,
1523 SSL_R_BAD_EXTENSION);
1526 OPENSSL_free(s->s3->alpn_selected);
1527 s->s3->alpn_selected = OPENSSL_malloc(len);
1528 if (s->s3->alpn_selected == NULL) {
1529 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PARSE_STOC_ALPN,
1530 ERR_R_INTERNAL_ERROR);
1533 if (!PACKET_copy_bytes(pkt, s->s3->alpn_selected, len)) {
1534 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PARSE_STOC_ALPN,
1535 SSL_R_BAD_EXTENSION);
1538 s->s3->alpn_selected_len = len;
1540 if (s->session->ext.alpn_selected == NULL
1541 || s->session->ext.alpn_selected_len != len
1542 || memcmp(s->session->ext.alpn_selected, s->s3->alpn_selected, len)
1544 /* ALPN not consistent with the old session so cannot use early_data */
1545 s->ext.early_data_ok = 0;
1548 /* If a new session then update it with the selected ALPN */
1549 s->session->ext.alpn_selected =
1550 OPENSSL_memdup(s->s3->alpn_selected, s->s3->alpn_selected_len);
1551 if (s->session->ext.alpn_selected == NULL) {
1552 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PARSE_STOC_ALPN,
1553 ERR_R_INTERNAL_ERROR);
1556 s->session->ext.alpn_selected_len = s->s3->alpn_selected_len;
1562 #ifndef OPENSSL_NO_SRTP
1563 int tls_parse_stoc_use_srtp(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
1566 unsigned int id, ct, mki;
1568 STACK_OF(SRTP_PROTECTION_PROFILE) *clnt;
1569 SRTP_PROTECTION_PROFILE *prof;
1571 if (!PACKET_get_net_2(pkt, &ct) || ct != 2
1572 || !PACKET_get_net_2(pkt, &id)
1573 || !PACKET_get_1(pkt, &mki)
1574 || PACKET_remaining(pkt) != 0) {
1575 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PARSE_STOC_USE_SRTP,
1576 SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST);
1581 /* Must be no MKI, since we never offer one */
1582 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_F_TLS_PARSE_STOC_USE_SRTP,
1583 SSL_R_BAD_SRTP_MKI_VALUE);
1587 /* Throw an error if the server gave us an unsolicited extension */
1588 clnt = SSL_get_srtp_profiles(s);
1590 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PARSE_STOC_USE_SRTP,
1591 SSL_R_NO_SRTP_PROFILES);
1596 * Check to see if the server gave us something we support (and
1597 * presumably offered)
1599 for (i = 0; i < sk_SRTP_PROTECTION_PROFILE_num(clnt); i++) {
1600 prof = sk_SRTP_PROTECTION_PROFILE_value(clnt, i);
1602 if (prof->id == id) {
1603 s->srtp_profile = prof;
1608 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PARSE_STOC_USE_SRTP,
1609 SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST);
1614 int tls_parse_stoc_etm(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
1617 /* Ignore if inappropriate ciphersuite */
1618 if (!(s->options & SSL_OP_NO_ENCRYPT_THEN_MAC)
1619 && s->s3->tmp.new_cipher->algorithm_mac != SSL_AEAD
1620 && s->s3->tmp.new_cipher->algorithm_enc != SSL_RC4)
1626 int tls_parse_stoc_ems(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
1629 s->s3->flags |= TLS1_FLAGS_RECEIVED_EXTMS;
1631 s->session->flags |= SSL_SESS_FLAG_EXTMS;
1636 int tls_parse_stoc_key_share(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
1639 #ifndef OPENSSL_NO_TLS1_3
1640 unsigned int group_id;
1642 EVP_PKEY *ckey = s->s3->tmp.pkey, *skey = NULL;
1645 if (ckey == NULL || s->s3->peer_tmp != NULL) {
1646 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PARSE_STOC_KEY_SHARE,
1647 ERR_R_INTERNAL_ERROR);
1651 if (!PACKET_get_net_2(pkt, &group_id)) {
1652 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PARSE_STOC_KEY_SHARE,
1653 SSL_R_LENGTH_MISMATCH);
1657 if ((context & SSL_EXT_TLS1_3_HELLO_RETRY_REQUEST) != 0) {
1658 const uint16_t *pgroups = NULL;
1659 size_t i, num_groups;
1661 if (PACKET_remaining(pkt) != 0) {
1662 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PARSE_STOC_KEY_SHARE,
1663 SSL_R_LENGTH_MISMATCH);
1668 * It is an error if the HelloRetryRequest wants a key_share that we
1669 * already sent in the first ClientHello
1671 if (group_id == s->s3->group_id) {
1672 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER,
1673 SSL_F_TLS_PARSE_STOC_KEY_SHARE, SSL_R_BAD_KEY_SHARE);
1677 /* Validate the selected group is one we support */
1678 tls1_get_supported_groups(s, &pgroups, &num_groups);
1679 for (i = 0; i < num_groups; i++) {
1680 if (group_id == pgroups[i])
1684 || !tls_curve_allowed(s, group_id, SSL_SECOP_CURVE_SUPPORTED)) {
1685 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER,
1686 SSL_F_TLS_PARSE_STOC_KEY_SHARE, SSL_R_BAD_KEY_SHARE);
1690 s->s3->group_id = group_id;
1691 EVP_PKEY_free(s->s3->tmp.pkey);
1692 s->s3->tmp.pkey = NULL;
1696 if (group_id != s->s3->group_id) {
1698 * This isn't for the group that we sent in the original
1701 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_F_TLS_PARSE_STOC_KEY_SHARE,
1702 SSL_R_BAD_KEY_SHARE);
1706 if (!PACKET_as_length_prefixed_2(pkt, &encoded_pt)
1707 || PACKET_remaining(&encoded_pt) == 0) {
1708 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PARSE_STOC_KEY_SHARE,
1709 SSL_R_LENGTH_MISMATCH);
1713 skey = ssl_generate_pkey(ckey);
1715 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PARSE_STOC_KEY_SHARE,
1716 ERR_R_MALLOC_FAILURE);
1719 if (!EVP_PKEY_set1_tls_encodedpoint(skey, PACKET_data(&encoded_pt),
1720 PACKET_remaining(&encoded_pt))) {
1721 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_F_TLS_PARSE_STOC_KEY_SHARE,
1723 EVP_PKEY_free(skey);
1727 if (ssl_derive(s, ckey, skey, 1) == 0) {
1728 /* SSLfatal() already called */
1729 EVP_PKEY_free(skey);
1732 s->s3->peer_tmp = skey;
1738 int tls_parse_stoc_cookie(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
1743 if (!PACKET_as_length_prefixed_2(pkt, &cookie)
1744 || !PACKET_memdup(&cookie, &s->ext.tls13_cookie,
1745 &s->ext.tls13_cookie_len)) {
1746 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PARSE_STOC_COOKIE,
1747 SSL_R_LENGTH_MISMATCH);
1754 int tls_parse_stoc_early_data(SSL *s, PACKET *pkt, unsigned int context,
1755 X509 *x, size_t chainidx)
1757 if (context == SSL_EXT_TLS1_3_NEW_SESSION_TICKET) {
1758 unsigned long max_early_data;
1760 if (!PACKET_get_net_4(pkt, &max_early_data)
1761 || PACKET_remaining(pkt) != 0) {
1762 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PARSE_STOC_EARLY_DATA,
1763 SSL_R_INVALID_MAX_EARLY_DATA);
1767 s->session->ext.max_early_data = max_early_data;
1772 if (PACKET_remaining(pkt) != 0) {
1773 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PARSE_STOC_EARLY_DATA,
1774 SSL_R_BAD_EXTENSION);
1778 if (!s->ext.early_data_ok
1780 || s->session->ext.tick_identity != 0) {
1782 * If we get here then we didn't send early data, or we didn't resume
1783 * using the first identity, or the SNI/ALPN is not consistent so the
1784 * server should not be accepting it.
1786 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_F_TLS_PARSE_STOC_EARLY_DATA,
1787 SSL_R_BAD_EXTENSION);
1791 s->ext.early_data = SSL_EARLY_DATA_ACCEPTED;
1796 int tls_parse_stoc_psk(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
1799 #ifndef OPENSSL_NO_TLS1_3
1800 unsigned int identity;
1802 if (!PACKET_get_net_2(pkt, &identity) || PACKET_remaining(pkt) != 0) {
1803 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PARSE_STOC_PSK,
1804 SSL_R_LENGTH_MISMATCH);
1808 if (s->session->ext.tick_identity == (int)identity) {
1810 SSL_SESSION_free(s->psksession);
1811 s->psksession = NULL;
1815 if (s->psksession == NULL
1816 || s->psksession->ext.tick_identity != (int)identity) {
1817 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_F_TLS_PARSE_STOC_PSK,
1818 SSL_R_BAD_PSK_IDENTITY);
1823 * If we used the external PSK for sending early_data then s->early_secret
1824 * is already set up, so don't overwrite it. Otherwise we copy the
1825 * early_secret across that we generated earlier.
1827 if ((s->early_data_state != SSL_EARLY_DATA_WRITE_RETRY
1828 && s->early_data_state != SSL_EARLY_DATA_FINISHED_WRITING)
1829 || s->session->ext.max_early_data > 0
1830 || s->psksession->ext.max_early_data == 0)
1831 memcpy(s->early_secret, s->psksession->early_secret, EVP_MAX_MD_SIZE);
1833 SSL_SESSION_free(s->session);
1834 s->session = s->psksession;
1835 s->psksession = NULL;