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 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_GROUPS,
200 ERR_R_INTERNAL_ERROR);
201 return EXT_RETURN_FAIL;
205 if (!WPACKET_close(pkt) || !WPACKET_close(pkt)) {
206 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_GROUPS,
207 ERR_R_INTERNAL_ERROR);
208 return EXT_RETURN_FAIL;
211 return EXT_RETURN_SENT;
215 EXT_RETURN tls_construct_ctos_session_ticket(SSL *s, WPACKET *pkt,
216 unsigned int context, X509 *x,
221 if (!tls_use_ticket(s))
222 return EXT_RETURN_NOT_SENT;
224 if (!s->new_session && s->session != NULL
225 && s->session->ext.tick != NULL
226 && s->session->ssl_version != TLS1_3_VERSION) {
227 ticklen = s->session->ext.ticklen;
228 } else if (s->session && s->ext.session_ticket != NULL
229 && s->ext.session_ticket->data != NULL) {
230 ticklen = s->ext.session_ticket->length;
231 s->session->ext.tick = OPENSSL_malloc(ticklen);
232 if (s->session->ext.tick == NULL) {
233 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
234 SSL_F_TLS_CONSTRUCT_CTOS_SESSION_TICKET,
235 ERR_R_INTERNAL_ERROR);
236 return EXT_RETURN_FAIL;
238 memcpy(s->session->ext.tick,
239 s->ext.session_ticket->data, ticklen);
240 s->session->ext.ticklen = ticklen;
245 if (ticklen == 0 && s->ext.session_ticket != NULL &&
246 s->ext.session_ticket->data == NULL)
247 return EXT_RETURN_NOT_SENT;
249 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_session_ticket)
250 || !WPACKET_sub_memcpy_u16(pkt, s->session->ext.tick, ticklen)) {
251 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
252 SSL_F_TLS_CONSTRUCT_CTOS_SESSION_TICKET, ERR_R_INTERNAL_ERROR);
253 return EXT_RETURN_FAIL;
256 return EXT_RETURN_SENT;
259 EXT_RETURN tls_construct_ctos_sig_algs(SSL *s, WPACKET *pkt,
260 unsigned int context, X509 *x,
264 const uint16_t *salg;
266 if (!SSL_CLIENT_USE_SIGALGS(s))
267 return EXT_RETURN_NOT_SENT;
269 salglen = tls12_get_psigalgs(s, 1, &salg);
270 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_signature_algorithms)
271 /* Sub-packet for sig-algs extension */
272 || !WPACKET_start_sub_packet_u16(pkt)
273 /* Sub-packet for the actual list */
274 || !WPACKET_start_sub_packet_u16(pkt)
275 || !tls12_copy_sigalgs(s, pkt, salg, salglen)
276 || !WPACKET_close(pkt)
277 || !WPACKET_close(pkt)) {
278 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CTOS_SIG_ALGS,
279 ERR_R_INTERNAL_ERROR);
280 return EXT_RETURN_FAIL;
283 return EXT_RETURN_SENT;
286 #ifndef OPENSSL_NO_OCSP
287 EXT_RETURN tls_construct_ctos_status_request(SSL *s, WPACKET *pkt,
288 unsigned int context, X509 *x,
293 /* This extension isn't defined for client Certificates */
295 return EXT_RETURN_NOT_SENT;
297 if (s->ext.status_type != TLSEXT_STATUSTYPE_ocsp)
298 return EXT_RETURN_NOT_SENT;
300 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_status_request)
301 /* Sub-packet for status request extension */
302 || !WPACKET_start_sub_packet_u16(pkt)
303 || !WPACKET_put_bytes_u8(pkt, TLSEXT_STATUSTYPE_ocsp)
304 /* Sub-packet for the ids */
305 || !WPACKET_start_sub_packet_u16(pkt)) {
306 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
307 SSL_F_TLS_CONSTRUCT_CTOS_STATUS_REQUEST, ERR_R_INTERNAL_ERROR);
308 return EXT_RETURN_FAIL;
310 for (i = 0; i < sk_OCSP_RESPID_num(s->ext.ocsp.ids); i++) {
311 unsigned char *idbytes;
312 OCSP_RESPID *id = sk_OCSP_RESPID_value(s->ext.ocsp.ids, i);
313 int idlen = i2d_OCSP_RESPID(id, NULL);
316 /* Sub-packet for an individual id */
317 || !WPACKET_sub_allocate_bytes_u16(pkt, idlen, &idbytes)
318 || i2d_OCSP_RESPID(id, &idbytes) != idlen) {
319 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
320 SSL_F_TLS_CONSTRUCT_CTOS_STATUS_REQUEST,
321 ERR_R_INTERNAL_ERROR);
322 return EXT_RETURN_FAIL;
325 if (!WPACKET_close(pkt)
326 || !WPACKET_start_sub_packet_u16(pkt)) {
327 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
328 SSL_F_TLS_CONSTRUCT_CTOS_STATUS_REQUEST, ERR_R_INTERNAL_ERROR);
329 return EXT_RETURN_FAIL;
331 if (s->ext.ocsp.exts) {
332 unsigned char *extbytes;
333 int extlen = i2d_X509_EXTENSIONS(s->ext.ocsp.exts, NULL);
336 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
337 SSL_F_TLS_CONSTRUCT_CTOS_STATUS_REQUEST,
338 ERR_R_INTERNAL_ERROR);
339 return EXT_RETURN_FAIL;
341 if (!WPACKET_allocate_bytes(pkt, extlen, &extbytes)
342 || i2d_X509_EXTENSIONS(s->ext.ocsp.exts, &extbytes)
344 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
345 SSL_F_TLS_CONSTRUCT_CTOS_STATUS_REQUEST,
346 ERR_R_INTERNAL_ERROR);
347 return EXT_RETURN_FAIL;
350 if (!WPACKET_close(pkt) || !WPACKET_close(pkt)) {
351 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
352 SSL_F_TLS_CONSTRUCT_CTOS_STATUS_REQUEST, ERR_R_INTERNAL_ERROR);
353 return EXT_RETURN_FAIL;
356 return EXT_RETURN_SENT;
360 #ifndef OPENSSL_NO_NEXTPROTONEG
361 EXT_RETURN tls_construct_ctos_npn(SSL *s, WPACKET *pkt, unsigned int context,
362 X509 *x, size_t chainidx)
364 if (s->ctx->ext.npn_select_cb == NULL || !SSL_IS_FIRST_HANDSHAKE(s))
365 return EXT_RETURN_NOT_SENT;
368 * The client advertises an empty extension to indicate its support
369 * for Next Protocol Negotiation
371 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_next_proto_neg)
372 || !WPACKET_put_bytes_u16(pkt, 0)) {
373 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CTOS_NPN,
374 ERR_R_INTERNAL_ERROR);
375 return EXT_RETURN_FAIL;
378 return EXT_RETURN_SENT;
382 EXT_RETURN tls_construct_ctos_alpn(SSL *s, WPACKET *pkt, unsigned int context,
383 X509 *x, size_t chainidx)
385 s->s3->alpn_sent = 0;
387 if (s->ext.alpn == NULL || !SSL_IS_FIRST_HANDSHAKE(s))
388 return EXT_RETURN_NOT_SENT;
390 if (!WPACKET_put_bytes_u16(pkt,
391 TLSEXT_TYPE_application_layer_protocol_negotiation)
392 /* Sub-packet ALPN extension */
393 || !WPACKET_start_sub_packet_u16(pkt)
394 || !WPACKET_sub_memcpy_u16(pkt, s->ext.alpn, s->ext.alpn_len)
395 || !WPACKET_close(pkt)) {
396 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CTOS_ALPN,
397 ERR_R_INTERNAL_ERROR);
398 return EXT_RETURN_FAIL;
400 s->s3->alpn_sent = 1;
402 return EXT_RETURN_SENT;
406 #ifndef OPENSSL_NO_SRTP
407 EXT_RETURN tls_construct_ctos_use_srtp(SSL *s, WPACKET *pkt,
408 unsigned int context, X509 *x,
411 STACK_OF(SRTP_PROTECTION_PROFILE) *clnt = SSL_get_srtp_profiles(s);
415 return EXT_RETURN_NOT_SENT;
417 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_use_srtp)
418 /* Sub-packet for SRTP extension */
419 || !WPACKET_start_sub_packet_u16(pkt)
420 /* Sub-packet for the protection profile list */
421 || !WPACKET_start_sub_packet_u16(pkt)) {
422 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CTOS_USE_SRTP,
423 ERR_R_INTERNAL_ERROR);
424 return EXT_RETURN_FAIL;
427 end = sk_SRTP_PROTECTION_PROFILE_num(clnt);
428 for (i = 0; i < end; i++) {
429 const SRTP_PROTECTION_PROFILE *prof =
430 sk_SRTP_PROTECTION_PROFILE_value(clnt, i);
432 if (prof == NULL || !WPACKET_put_bytes_u16(pkt, prof->id)) {
433 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
434 SSL_F_TLS_CONSTRUCT_CTOS_USE_SRTP, ERR_R_INTERNAL_ERROR);
435 return EXT_RETURN_FAIL;
438 if (!WPACKET_close(pkt)
439 /* Add an empty use_mki value */
440 || !WPACKET_put_bytes_u8(pkt, 0)
441 || !WPACKET_close(pkt)) {
442 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CTOS_USE_SRTP,
443 ERR_R_INTERNAL_ERROR);
444 return EXT_RETURN_FAIL;
447 return EXT_RETURN_SENT;
451 EXT_RETURN tls_construct_ctos_etm(SSL *s, WPACKET *pkt, unsigned int context,
452 X509 *x, size_t chainidx)
454 if (s->options & SSL_OP_NO_ENCRYPT_THEN_MAC)
455 return EXT_RETURN_NOT_SENT;
457 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_encrypt_then_mac)
458 || !WPACKET_put_bytes_u16(pkt, 0)) {
459 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CTOS_ETM,
460 ERR_R_INTERNAL_ERROR);
461 return EXT_RETURN_FAIL;
464 return EXT_RETURN_SENT;
467 #ifndef OPENSSL_NO_CT
468 EXT_RETURN tls_construct_ctos_sct(SSL *s, WPACKET *pkt, unsigned int context,
469 X509 *x, size_t chainidx)
471 if (s->ct_validation_callback == NULL)
472 return EXT_RETURN_NOT_SENT;
474 /* Not defined for client Certificates */
476 return EXT_RETURN_NOT_SENT;
478 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_signed_certificate_timestamp)
479 || !WPACKET_put_bytes_u16(pkt, 0)) {
480 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CTOS_SCT,
481 ERR_R_INTERNAL_ERROR);
482 return EXT_RETURN_FAIL;
485 return EXT_RETURN_SENT;
489 EXT_RETURN tls_construct_ctos_ems(SSL *s, WPACKET *pkt, unsigned int context,
490 X509 *x, size_t chainidx)
492 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_extended_master_secret)
493 || !WPACKET_put_bytes_u16(pkt, 0)) {
494 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CTOS_EMS,
495 ERR_R_INTERNAL_ERROR);
496 return EXT_RETURN_FAIL;
499 return EXT_RETURN_SENT;
502 EXT_RETURN tls_construct_ctos_supported_versions(SSL *s, WPACKET *pkt,
503 unsigned int context, X509 *x,
506 int currv, min_version, max_version, reason;
508 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_supported_versions)
509 || !WPACKET_start_sub_packet_u16(pkt)
510 || !WPACKET_start_sub_packet_u8(pkt)) {
511 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
512 SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_VERSIONS,
513 ERR_R_INTERNAL_ERROR);
514 return EXT_RETURN_FAIL;
517 reason = ssl_get_min_max_version(s, &min_version, &max_version);
519 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
520 SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_VERSIONS, reason);
521 return EXT_RETURN_FAIL;
525 * TODO(TLS1.3): There is some discussion on the TLS list as to whether
526 * we should include versions <TLS1.2. For the moment we do. To be
529 for (currv = max_version; currv >= min_version; currv--) {
530 /* TODO(TLS1.3): Remove this first if clause prior to release!! */
531 if (currv == TLS1_3_VERSION) {
532 if (!WPACKET_put_bytes_u16(pkt, TLS1_3_VERSION_DRAFT)) {
533 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
534 SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_VERSIONS,
535 ERR_R_INTERNAL_ERROR);
536 return EXT_RETURN_FAIL;
538 } else if (!WPACKET_put_bytes_u16(pkt, currv)) {
539 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
540 SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_VERSIONS,
541 ERR_R_INTERNAL_ERROR);
542 return EXT_RETURN_FAIL;
545 if (!WPACKET_close(pkt) || !WPACKET_close(pkt)) {
546 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
547 SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_VERSIONS,
548 ERR_R_INTERNAL_ERROR);
549 return EXT_RETURN_FAIL;
552 return EXT_RETURN_SENT;
556 * Construct a psk_kex_modes extension.
558 EXT_RETURN tls_construct_ctos_psk_kex_modes(SSL *s, WPACKET *pkt,
559 unsigned int context, X509 *x,
562 #ifndef OPENSSL_NO_TLS1_3
563 int nodhe = s->options & SSL_OP_ALLOW_NO_DHE_KEX;
565 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_psk_kex_modes)
566 || !WPACKET_start_sub_packet_u16(pkt)
567 || !WPACKET_start_sub_packet_u8(pkt)
568 || !WPACKET_put_bytes_u8(pkt, TLSEXT_KEX_MODE_KE_DHE)
569 || (nodhe && !WPACKET_put_bytes_u8(pkt, TLSEXT_KEX_MODE_KE))
570 || !WPACKET_close(pkt)
571 || !WPACKET_close(pkt)) {
572 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
573 SSL_F_TLS_CONSTRUCT_CTOS_PSK_KEX_MODES, ERR_R_INTERNAL_ERROR);
574 return EXT_RETURN_FAIL;
577 s->ext.psk_kex_mode = TLSEXT_KEX_MODE_FLAG_KE_DHE;
579 s->ext.psk_kex_mode |= TLSEXT_KEX_MODE_FLAG_KE;
582 return EXT_RETURN_SENT;
585 #ifndef OPENSSL_NO_TLS1_3
586 static int add_key_share(SSL *s, WPACKET *pkt, unsigned int curve_id)
588 unsigned char *encoded_point = NULL;
589 EVP_PKEY *key_share_key = NULL;
592 if (s->s3->tmp.pkey != NULL) {
593 if (!ossl_assert(s->hello_retry_request)) {
594 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_ADD_KEY_SHARE,
595 ERR_R_INTERNAL_ERROR);
599 * Could happen if we got an HRR that wasn't requesting a new key_share
601 key_share_key = s->s3->tmp.pkey;
603 key_share_key = ssl_generate_pkey_group(s, curve_id);
604 if (key_share_key == NULL) {
605 /* SSLfatal() already called */
610 /* Encode the public key. */
611 encodedlen = EVP_PKEY_get1_tls_encodedpoint(key_share_key,
613 if (encodedlen == 0) {
614 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_ADD_KEY_SHARE, ERR_R_EC_LIB);
618 /* Create KeyShareEntry */
619 if (!WPACKET_put_bytes_u16(pkt, curve_id)
620 || !WPACKET_sub_memcpy_u16(pkt, encoded_point, encodedlen)) {
621 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_ADD_KEY_SHARE,
622 ERR_R_INTERNAL_ERROR);
627 * TODO(TLS1.3): When changing to send more than one key_share we're
628 * going to need to be able to save more than one EVP_PKEY. For now
629 * we reuse the existing tmp.pkey
631 s->s3->tmp.pkey = key_share_key;
632 s->s3->group_id = curve_id;
633 OPENSSL_free(encoded_point);
637 if (s->s3->tmp.pkey == NULL)
638 EVP_PKEY_free(key_share_key);
639 OPENSSL_free(encoded_point);
644 EXT_RETURN tls_construct_ctos_key_share(SSL *s, WPACKET *pkt,
645 unsigned int context, X509 *x,
648 #ifndef OPENSSL_NO_TLS1_3
649 size_t i, num_groups = 0;
650 const uint16_t *pgroups = NULL;
651 uint16_t curve_id = 0;
653 /* key_share extension */
654 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_key_share)
655 /* Extension data sub-packet */
656 || !WPACKET_start_sub_packet_u16(pkt)
657 /* KeyShare list sub-packet */
658 || !WPACKET_start_sub_packet_u16(pkt)) {
659 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CTOS_KEY_SHARE,
660 ERR_R_INTERNAL_ERROR);
661 return EXT_RETURN_FAIL;
664 tls1_get_supported_groups(s, &pgroups, &num_groups);
667 * TODO(TLS1.3): Make the number of key_shares sent configurable. For
670 if (s->s3->group_id != 0) {
671 curve_id = s->s3->group_id;
673 for (i = 0; i < num_groups; i++) {
675 if (!tls_curve_allowed(s, pgroups[i], SSL_SECOP_CURVE_SUPPORTED))
678 curve_id = pgroups[i];
684 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CTOS_KEY_SHARE,
685 SSL_R_NO_SUITABLE_KEY_SHARE);
686 return EXT_RETURN_FAIL;
689 if (!add_key_share(s, pkt, curve_id)) {
690 /* SSLfatal() already called */
691 return EXT_RETURN_FAIL;
694 if (!WPACKET_close(pkt) || !WPACKET_close(pkt)) {
695 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CTOS_KEY_SHARE,
696 ERR_R_INTERNAL_ERROR);
697 return EXT_RETURN_FAIL;
701 return EXT_RETURN_SENT;
704 EXT_RETURN tls_construct_ctos_cookie(SSL *s, WPACKET *pkt, unsigned int context,
705 X509 *x, size_t chainidx)
707 EXT_RETURN ret = EXT_RETURN_FAIL;
709 /* Should only be set if we've had an HRR */
710 if (s->ext.tls13_cookie_len == 0)
711 return EXT_RETURN_NOT_SENT;
713 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_cookie)
714 /* Extension data sub-packet */
715 || !WPACKET_start_sub_packet_u16(pkt)
716 || !WPACKET_sub_memcpy_u16(pkt, s->ext.tls13_cookie,
717 s->ext.tls13_cookie_len)
718 || !WPACKET_close(pkt)) {
719 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CTOS_COOKIE,
720 ERR_R_INTERNAL_ERROR);
724 ret = EXT_RETURN_SENT;
726 OPENSSL_free(s->ext.tls13_cookie);
727 s->ext.tls13_cookie = NULL;
728 s->ext.tls13_cookie_len = 0;
733 EXT_RETURN tls_construct_ctos_early_data(SSL *s, WPACKET *pkt,
734 unsigned int context, X509 *x,
737 const unsigned char *id = NULL;
739 SSL_SESSION *psksess = NULL;
740 SSL_SESSION *edsess = NULL;
741 const EVP_MD *handmd = NULL;
743 if (s->hello_retry_request)
744 handmd = ssl_handshake_md(s);
746 if (s->psk_use_session_cb != NULL
747 && (!s->psk_use_session_cb(s, handmd, &id, &idlen, &psksess)
749 && psksess->ssl_version != TLS1_3_VERSION))) {
750 SSL_SESSION_free(psksess);
751 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CTOS_EARLY_DATA,
753 return EXT_RETURN_FAIL;
756 SSL_SESSION_free(s->psksession);
757 s->psksession = psksess;
758 if (psksess != NULL) {
759 OPENSSL_free(s->psksession_id);
760 s->psksession_id = OPENSSL_memdup(id, idlen);
761 if (s->psksession_id == NULL) {
762 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
763 SSL_F_TLS_CONSTRUCT_CTOS_EARLY_DATA, ERR_R_INTERNAL_ERROR);
764 return EXT_RETURN_FAIL;
766 s->psksession_id_len = idlen;
769 if (s->early_data_state != SSL_EARLY_DATA_CONNECTING
770 || (s->session->ext.max_early_data == 0
771 && (psksess == NULL || psksess->ext.max_early_data == 0))) {
772 s->max_early_data = 0;
773 return EXT_RETURN_NOT_SENT;
775 edsess = s->session->ext.max_early_data != 0 ? s->session : psksess;
776 s->max_early_data = edsess->ext.max_early_data;
778 if (edsess->ext.hostname != NULL) {
779 if (s->ext.hostname == NULL
780 || (s->ext.hostname != NULL
781 && strcmp(s->ext.hostname, edsess->ext.hostname) != 0)) {
782 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
783 SSL_F_TLS_CONSTRUCT_CTOS_EARLY_DATA,
784 SSL_R_INCONSISTENT_EARLY_DATA_SNI);
785 return EXT_RETURN_FAIL;
789 if ((s->ext.alpn == NULL && edsess->ext.alpn_selected != NULL)) {
790 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CTOS_EARLY_DATA,
791 SSL_R_INCONSISTENT_EARLY_DATA_ALPN);
792 return EXT_RETURN_FAIL;
796 * Verify that we are offering an ALPN protocol consistent with the early
799 if (edsess->ext.alpn_selected != NULL) {
800 PACKET prots, alpnpkt;
803 if (!PACKET_buf_init(&prots, s->ext.alpn, s->ext.alpn_len)) {
804 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
805 SSL_F_TLS_CONSTRUCT_CTOS_EARLY_DATA, ERR_R_INTERNAL_ERROR);
806 return EXT_RETURN_FAIL;
808 while (PACKET_get_length_prefixed_1(&prots, &alpnpkt)) {
809 if (PACKET_equal(&alpnpkt, edsess->ext.alpn_selected,
810 edsess->ext.alpn_selected_len)) {
816 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
817 SSL_F_TLS_CONSTRUCT_CTOS_EARLY_DATA,
818 SSL_R_INCONSISTENT_EARLY_DATA_ALPN);
819 return EXT_RETURN_FAIL;
823 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_early_data)
824 || !WPACKET_start_sub_packet_u16(pkt)
825 || !WPACKET_close(pkt)) {
826 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CTOS_EARLY_DATA,
827 ERR_R_INTERNAL_ERROR);
828 return EXT_RETURN_FAIL;
832 * We set this to rejected here. Later, if the server acknowledges the
833 * extension, we set it to accepted.
835 s->ext.early_data = SSL_EARLY_DATA_REJECTED;
836 s->ext.early_data_ok = 1;
838 return EXT_RETURN_SENT;
841 #define F5_WORKAROUND_MIN_MSG_LEN 0xff
842 #define F5_WORKAROUND_MAX_MSG_LEN 0x200
845 * PSK pre binder overhead =
846 * 2 bytes for TLSEXT_TYPE_psk
847 * 2 bytes for extension length
848 * 2 bytes for identities list length
849 * 2 bytes for identity length
850 * 4 bytes for obfuscated_ticket_age
851 * 2 bytes for binder list length
852 * 1 byte for binder length
853 * The above excludes the number of bytes for the identity itself and the
854 * subsequent binder bytes
856 #define PSK_PRE_BINDER_OVERHEAD (2 + 2 + 2 + 2 + 4 + 2 + 1)
858 EXT_RETURN tls_construct_ctos_padding(SSL *s, WPACKET *pkt,
859 unsigned int context, X509 *x,
862 unsigned char *padbytes;
865 if ((s->options & SSL_OP_TLSEXT_PADDING) == 0)
866 return EXT_RETURN_NOT_SENT;
869 * Add padding to workaround bugs in F5 terminators. See RFC7685.
870 * This code calculates the length of all extensions added so far but
871 * excludes the PSK extension (because that MUST be written last). Therefore
872 * this extension MUST always appear second to last.
874 if (!WPACKET_get_total_written(pkt, &hlen)) {
875 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CTOS_PADDING,
876 ERR_R_INTERNAL_ERROR);
877 return EXT_RETURN_FAIL;
881 * If we're going to send a PSK then that will be written out after this
882 * extension, so we need to calculate how long it is going to be.
884 if (s->session->ssl_version == TLS1_3_VERSION
885 && s->session->ext.ticklen != 0
886 && s->session->cipher != NULL) {
887 const EVP_MD *md = ssl_md(s->session->cipher->algorithm2);
891 * Add the fixed PSK overhead, the identity length and the binder
894 hlen += PSK_PRE_BINDER_OVERHEAD + s->session->ext.ticklen
899 if (hlen > F5_WORKAROUND_MIN_MSG_LEN && hlen < F5_WORKAROUND_MAX_MSG_LEN) {
900 /* Calculate the amount of padding we need to add */
901 hlen = F5_WORKAROUND_MAX_MSG_LEN - hlen;
904 * Take off the size of extension header itself (2 bytes for type and
905 * 2 bytes for length bytes), but ensure that the extension is at least
906 * 1 byte long so as not to have an empty extension last (WebSphere 7.x,
907 * 8.x are intolerant of that condition)
914 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_padding)
915 || !WPACKET_sub_allocate_bytes_u16(pkt, hlen, &padbytes)) {
916 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CTOS_PADDING,
917 ERR_R_INTERNAL_ERROR);
918 return EXT_RETURN_FAIL;
920 memset(padbytes, 0, hlen);
923 return EXT_RETURN_SENT;
927 * Construct the pre_shared_key extension
929 EXT_RETURN tls_construct_ctos_psk(SSL *s, WPACKET *pkt, unsigned int context,
930 X509 *x, size_t chainidx)
932 #ifndef OPENSSL_NO_TLS1_3
933 uint32_t now, agesec, agems = 0;
934 size_t reshashsize = 0, pskhashsize = 0, binderoffset, msglen;
935 unsigned char *resbinder = NULL, *pskbinder = NULL, *msgstart = NULL;
936 const EVP_MD *handmd = NULL, *mdres = NULL, *mdpsk = NULL;
937 EXT_RETURN ret = EXT_RETURN_FAIL;
940 s->session->ext.tick_identity = TLSEXT_PSK_BAD_IDENTITY;
943 * Note: At this stage of the code we only support adding a single
944 * resumption PSK. If we add support for multiple PSKs then the length
945 * calculations in the padding extension will need to be adjusted.
949 * If this is an incompatible or new session then we have nothing to resume
950 * so don't add this extension.
952 if (s->session->ssl_version != TLS1_3_VERSION
953 || (s->session->ext.ticklen == 0 && s->psksession == NULL))
954 return EXT_RETURN_NOT_SENT;
956 if (s->hello_retry_request)
957 handmd = ssl_handshake_md(s);
959 if (s->session->ext.ticklen != 0) {
960 /* Get the digest associated with the ciphersuite in the session */
961 if (s->session->cipher == NULL) {
962 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CTOS_PSK,
963 ERR_R_INTERNAL_ERROR);
966 mdres = ssl_md(s->session->cipher->algorithm2);
969 * Don't recognize this cipher so we can't use the session.
975 if (s->hello_retry_request && mdres != handmd) {
977 * Selected ciphersuite hash does not match the hash for the session
978 * so we can't use it.
984 * Technically the C standard just says time() returns a time_t and says
985 * nothing about the encoding of that type. In practice most
986 * implementations follow POSIX which holds it as an integral type in
987 * seconds since epoch. We've already made the assumption that we can do
988 * this in multiple places in the code, so portability shouldn't be an
991 now = (uint32_t)time(NULL);
992 agesec = now - (uint32_t)s->session->time;
994 if (s->session->ext.tick_lifetime_hint < agesec) {
995 /* Ticket is too old. Ignore it. */
1000 * Calculate age in ms. We're just doing it to nearest second. Should be
1003 agems = agesec * (uint32_t)1000;
1005 if (agesec != 0 && agems / (uint32_t)1000 != agesec) {
1007 * Overflow. Shouldn't happen unless this is a *really* old session.
1008 * If so we just ignore it.
1014 * Obfuscate the age. Overflow here is fine, this addition is supposed
1017 agems += s->session->ext.tick_age_add;
1019 reshashsize = EVP_MD_size(mdres);
1024 if (!dores && s->psksession == NULL)
1025 return EXT_RETURN_NOT_SENT;
1027 if (s->psksession != NULL) {
1028 mdpsk = ssl_md(s->psksession->cipher->algorithm2);
1029 if (mdpsk == NULL) {
1031 * Don't recognize this cipher so we can't use the session.
1032 * If this happens it's an application bug.
1034 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CTOS_PSK,
1039 if (s->hello_retry_request && mdpsk != handmd) {
1041 * Selected ciphersuite hash does not match the hash for the PSK
1042 * session. This is an application bug.
1044 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CTOS_PSK,
1049 pskhashsize = EVP_MD_size(mdpsk);
1052 /* Create the extension, but skip over the binder for now */
1053 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_psk)
1054 || !WPACKET_start_sub_packet_u16(pkt)
1055 || !WPACKET_start_sub_packet_u16(pkt)) {
1056 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CTOS_PSK,
1057 ERR_R_INTERNAL_ERROR);
1062 if (!WPACKET_sub_memcpy_u16(pkt, s->session->ext.tick,
1063 s->session->ext.ticklen)
1064 || !WPACKET_put_bytes_u32(pkt, agems)) {
1065 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CTOS_PSK,
1066 ERR_R_INTERNAL_ERROR);
1071 if (s->psksession != NULL) {
1072 if (!WPACKET_sub_memcpy_u16(pkt, s->psksession_id,
1073 s->psksession_id_len)
1074 || !WPACKET_put_bytes_u32(pkt, 0)) {
1075 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CTOS_PSK,
1076 ERR_R_INTERNAL_ERROR);
1081 if (!WPACKET_close(pkt)
1082 || !WPACKET_get_total_written(pkt, &binderoffset)
1083 || !WPACKET_start_sub_packet_u16(pkt)
1085 && !WPACKET_sub_allocate_bytes_u8(pkt, reshashsize, &resbinder))
1086 || (s->psksession != NULL
1087 && !WPACKET_sub_allocate_bytes_u8(pkt, pskhashsize, &pskbinder))
1088 || !WPACKET_close(pkt)
1089 || !WPACKET_close(pkt)
1090 || !WPACKET_get_total_written(pkt, &msglen)
1092 * We need to fill in all the sub-packet lengths now so we can
1093 * calculate the HMAC of the message up to the binders
1095 || !WPACKET_fill_lengths(pkt)) {
1096 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CTOS_PSK,
1097 ERR_R_INTERNAL_ERROR);
1101 msgstart = WPACKET_get_curr(pkt) - msglen;
1104 && tls_psk_do_binder(s, mdres, msgstart, binderoffset, NULL,
1105 resbinder, s->session, 1, 0) != 1) {
1106 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CTOS_PSK,
1107 ERR_R_INTERNAL_ERROR);
1111 if (s->psksession != NULL
1112 && tls_psk_do_binder(s, mdpsk, msgstart, binderoffset, NULL,
1113 pskbinder, s->psksession, 1, 1) != 1) {
1114 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CTOS_PSK,
1115 ERR_R_INTERNAL_ERROR);
1120 s->session->ext.tick_identity = 0;
1121 if (s->psksession != NULL)
1122 s->psksession->ext.tick_identity = (dores ? 1 : 0);
1124 ret = EXT_RETURN_SENT;
1128 return EXT_RETURN_NOT_SENT;
1133 * Parse the server's renegotiation binding and abort if it's not right
1135 int tls_parse_stoc_renegotiate(SSL *s, PACKET *pkt, unsigned int context,
1136 X509 *x, size_t chainidx)
1138 size_t expected_len = s->s3->previous_client_finished_len
1139 + s->s3->previous_server_finished_len;
1141 const unsigned char *data;
1143 /* Check for logic errors */
1144 if (!ossl_assert(expected_len == 0
1145 || s->s3->previous_client_finished_len != 0)
1146 || !ossl_assert(expected_len == 0
1147 || s->s3->previous_server_finished_len != 0)) {
1148 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PARSE_STOC_RENEGOTIATE,
1149 ERR_R_INTERNAL_ERROR);
1153 /* Parse the length byte */
1154 if (!PACKET_get_1_len(pkt, &ilen)) {
1155 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PARSE_STOC_RENEGOTIATE,
1156 SSL_R_RENEGOTIATION_ENCODING_ERR);
1160 /* Consistency check */
1161 if (PACKET_remaining(pkt) != ilen) {
1162 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PARSE_STOC_RENEGOTIATE,
1163 SSL_R_RENEGOTIATION_ENCODING_ERR);
1167 /* Check that the extension matches */
1168 if (ilen != expected_len) {
1169 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_F_TLS_PARSE_STOC_RENEGOTIATE,
1170 SSL_R_RENEGOTIATION_MISMATCH);
1174 if (!PACKET_get_bytes(pkt, &data, s->s3->previous_client_finished_len)
1175 || memcmp(data, s->s3->previous_client_finished,
1176 s->s3->previous_client_finished_len) != 0) {
1177 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_F_TLS_PARSE_STOC_RENEGOTIATE,
1178 SSL_R_RENEGOTIATION_MISMATCH);
1182 if (!PACKET_get_bytes(pkt, &data, s->s3->previous_server_finished_len)
1183 || memcmp(data, s->s3->previous_server_finished,
1184 s->s3->previous_server_finished_len) != 0) {
1185 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_F_TLS_PARSE_STOC_RENEGOTIATE,
1186 SSL_R_RENEGOTIATION_MISMATCH);
1189 s->s3->send_connection_binding = 1;
1194 /* Parse the server's max fragment len extension packet */
1195 int tls_parse_stoc_maxfragmentlen(SSL *s, PACKET *pkt, unsigned int context,
1196 X509 *x, size_t chainidx)
1200 if (PACKET_remaining(pkt) != 1 || !PACKET_get_1(pkt, &value)) {
1201 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PARSE_STOC_MAXFRAGMENTLEN,
1202 SSL_R_BAD_EXTENSION);
1206 /* |value| should contains a valid max-fragment-length code. */
1207 if (!IS_MAX_FRAGMENT_LENGTH_EXT_VALID(value)) {
1208 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER,
1209 SSL_F_TLS_PARSE_STOC_MAXFRAGMENTLEN,
1210 SSL_R_SSL3_EXT_INVALID_MAX_FRAGMENT_LENGTH);
1214 /* Must be the same value as client-configured one who was sent to server */
1216 * RFC 6066: if a client receives a maximum fragment length negotiation
1217 * response that differs from the length it requested, ...
1218 * It must abort with SSL_AD_ILLEGAL_PARAMETER alert
1220 if (value != s->ext.max_fragment_len_mode) {
1221 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER,
1222 SSL_F_TLS_PARSE_STOC_MAXFRAGMENTLEN,
1223 SSL_R_SSL3_EXT_INVALID_MAX_FRAGMENT_LENGTH);
1228 * Maximum Fragment Length Negotiation succeeded.
1229 * The negotiated Maximum Fragment Length is binding now.
1231 s->session->ext.max_fragment_len_mode = value;
1236 int tls_parse_stoc_server_name(SSL *s, PACKET *pkt, unsigned int context,
1237 X509 *x, size_t chainidx)
1239 if (s->ext.hostname == NULL) {
1240 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PARSE_STOC_SERVER_NAME,
1241 ERR_R_INTERNAL_ERROR);
1245 if (PACKET_remaining(pkt) > 0) {
1246 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PARSE_STOC_SERVER_NAME,
1247 SSL_R_BAD_EXTENSION);
1252 if (s->session->ext.hostname != NULL) {
1253 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PARSE_STOC_SERVER_NAME,
1254 ERR_R_INTERNAL_ERROR);
1257 s->session->ext.hostname = OPENSSL_strdup(s->ext.hostname);
1258 if (s->session->ext.hostname == NULL) {
1259 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PARSE_STOC_SERVER_NAME,
1260 ERR_R_INTERNAL_ERROR);
1268 #ifndef OPENSSL_NO_EC
1269 int tls_parse_stoc_ec_pt_formats(SSL *s, PACKET *pkt, unsigned int context,
1270 X509 *x, size_t chainidx)
1272 unsigned int ecpointformats_len;
1273 PACKET ecptformatlist;
1275 if (!PACKET_as_length_prefixed_1(pkt, &ecptformatlist)) {
1276 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PARSE_STOC_EC_PT_FORMATS,
1277 SSL_R_BAD_EXTENSION);
1281 ecpointformats_len = PACKET_remaining(&ecptformatlist);
1282 s->session->ext.ecpointformats_len = 0;
1284 OPENSSL_free(s->session->ext.ecpointformats);
1285 s->session->ext.ecpointformats = OPENSSL_malloc(ecpointformats_len);
1286 if (s->session->ext.ecpointformats == NULL) {
1287 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
1288 SSL_F_TLS_PARSE_STOC_EC_PT_FORMATS, ERR_R_INTERNAL_ERROR);
1292 s->session->ext.ecpointformats_len = ecpointformats_len;
1294 if (!PACKET_copy_bytes(&ecptformatlist,
1295 s->session->ext.ecpointformats,
1296 ecpointformats_len)) {
1297 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
1298 SSL_F_TLS_PARSE_STOC_EC_PT_FORMATS, ERR_R_INTERNAL_ERROR);
1307 int tls_parse_stoc_session_ticket(SSL *s, PACKET *pkt, unsigned int context,
1308 X509 *x, size_t chainidx)
1310 if (s->ext.session_ticket_cb != NULL &&
1311 !s->ext.session_ticket_cb(s, PACKET_data(pkt),
1312 PACKET_remaining(pkt),
1313 s->ext.session_ticket_cb_arg)) {
1314 SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE,
1315 SSL_F_TLS_PARSE_STOC_SESSION_TICKET, SSL_R_BAD_EXTENSION);
1319 if (!tls_use_ticket(s)) {
1320 SSLfatal(s, SSL_AD_UNSUPPORTED_EXTENSION,
1321 SSL_F_TLS_PARSE_STOC_SESSION_TICKET, SSL_R_BAD_EXTENSION);
1324 if (PACKET_remaining(pkt) > 0) {
1325 SSLfatal(s, SSL_AD_DECODE_ERROR,
1326 SSL_F_TLS_PARSE_STOC_SESSION_TICKET, SSL_R_BAD_EXTENSION);
1330 s->ext.ticket_expected = 1;
1335 #ifndef OPENSSL_NO_OCSP
1336 int tls_parse_stoc_status_request(SSL *s, PACKET *pkt, unsigned int context,
1337 X509 *x, size_t chainidx)
1340 * MUST only be sent if we've requested a status
1341 * request message. In TLS <= 1.2 it must also be empty.
1343 if (s->ext.status_type != TLSEXT_STATUSTYPE_ocsp) {
1344 SSLfatal(s, SSL_AD_UNSUPPORTED_EXTENSION,
1345 SSL_F_TLS_PARSE_STOC_STATUS_REQUEST, SSL_R_BAD_EXTENSION);
1348 if (!SSL_IS_TLS13(s) && PACKET_remaining(pkt) > 0) {
1349 SSLfatal(s, SSL_AD_DECODE_ERROR,
1350 SSL_F_TLS_PARSE_STOC_STATUS_REQUEST, SSL_R_BAD_EXTENSION);
1354 if (SSL_IS_TLS13(s)) {
1355 /* We only know how to handle this if it's for the first Certificate in
1356 * the chain. We ignore any other responses.
1361 /* SSLfatal() already called */
1362 return tls_process_cert_status_body(s, pkt);
1365 /* Set flag to expect CertificateStatus message */
1366 s->ext.status_expected = 1;
1373 #ifndef OPENSSL_NO_CT
1374 int tls_parse_stoc_sct(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
1378 * Only take it if we asked for it - i.e if there is no CT validation
1379 * callback set, then a custom extension MAY be processing it, so we
1380 * need to let control continue to flow to that.
1382 if (s->ct_validation_callback != NULL) {
1383 size_t size = PACKET_remaining(pkt);
1385 /* Simply copy it off for later processing */
1386 OPENSSL_free(s->ext.scts);
1389 s->ext.scts_len = (uint16_t)size;
1391 s->ext.scts = OPENSSL_malloc(size);
1392 if (s->ext.scts == NULL
1393 || !PACKET_copy_bytes(pkt, s->ext.scts, size)) {
1394 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PARSE_STOC_SCT,
1395 ERR_R_INTERNAL_ERROR);
1400 ENDPOINT role = (context & SSL_EXT_TLS1_2_SERVER_HELLO) != 0
1401 ? ENDPOINT_CLIENT : ENDPOINT_BOTH;
1404 * If we didn't ask for it then there must be a custom extension,
1405 * otherwise this is unsolicited.
1407 if (custom_ext_find(&s->cert->custext, role,
1408 TLSEXT_TYPE_signed_certificate_timestamp,
1410 SSLfatal(s, TLS1_AD_UNSUPPORTED_EXTENSION, SSL_F_TLS_PARSE_STOC_SCT,
1411 SSL_R_BAD_EXTENSION);
1415 if (!custom_ext_parse(s, context,
1416 TLSEXT_TYPE_signed_certificate_timestamp,
1417 PACKET_data(pkt), PACKET_remaining(pkt),
1419 /* SSLfatal already called */
1429 #ifndef OPENSSL_NO_NEXTPROTONEG
1431 * ssl_next_proto_validate validates a Next Protocol Negotiation block. No
1432 * elements of zero length are allowed and the set of elements must exactly
1433 * fill the length of the block. Returns 1 on success or 0 on failure.
1435 static int ssl_next_proto_validate(SSL *s, PACKET *pkt)
1437 PACKET tmp_protocol;
1439 while (PACKET_remaining(pkt)) {
1440 if (!PACKET_get_length_prefixed_1(pkt, &tmp_protocol)
1441 || PACKET_remaining(&tmp_protocol) == 0) {
1442 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_SSL_NEXT_PROTO_VALIDATE,
1443 SSL_R_BAD_EXTENSION);
1451 int tls_parse_stoc_npn(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
1454 unsigned char *selected;
1455 unsigned char selected_len;
1458 /* Check if we are in a renegotiation. If so ignore this extension */
1459 if (!SSL_IS_FIRST_HANDSHAKE(s))
1462 /* We must have requested it. */
1463 if (s->ctx->ext.npn_select_cb == NULL) {
1464 SSLfatal(s, SSL_AD_UNSUPPORTED_EXTENSION, SSL_F_TLS_PARSE_STOC_NPN,
1465 SSL_R_BAD_EXTENSION);
1469 /* The data must be valid */
1471 if (!ssl_next_proto_validate(s, &tmppkt)) {
1472 /* SSLfatal() already called */
1475 if (s->ctx->ext.npn_select_cb(s, &selected, &selected_len,
1477 PACKET_remaining(pkt),
1478 s->ctx->ext.npn_select_cb_arg) !=
1479 SSL_TLSEXT_ERR_OK) {
1480 SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE, SSL_F_TLS_PARSE_STOC_NPN,
1481 SSL_R_BAD_EXTENSION);
1486 * Could be non-NULL if server has sent multiple NPN extensions in
1487 * a single Serverhello
1489 OPENSSL_free(s->ext.npn);
1490 s->ext.npn = OPENSSL_malloc(selected_len);
1491 if (s->ext.npn == NULL) {
1492 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PARSE_STOC_NPN,
1493 ERR_R_INTERNAL_ERROR);
1497 memcpy(s->ext.npn, selected, selected_len);
1498 s->ext.npn_len = selected_len;
1499 s->s3->npn_seen = 1;
1505 int tls_parse_stoc_alpn(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
1510 /* We must have requested it. */
1511 if (!s->s3->alpn_sent) {
1512 SSLfatal(s, SSL_AD_UNSUPPORTED_EXTENSION, SSL_F_TLS_PARSE_STOC_ALPN,
1513 SSL_R_BAD_EXTENSION);
1517 * The extension data consists of:
1518 * uint16 list_length
1519 * uint8 proto_length;
1520 * uint8 proto[proto_length];
1522 if (!PACKET_get_net_2_len(pkt, &len)
1523 || PACKET_remaining(pkt) != len || !PACKET_get_1_len(pkt, &len)
1524 || PACKET_remaining(pkt) != len) {
1525 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PARSE_STOC_ALPN,
1526 SSL_R_BAD_EXTENSION);
1529 OPENSSL_free(s->s3->alpn_selected);
1530 s->s3->alpn_selected = OPENSSL_malloc(len);
1531 if (s->s3->alpn_selected == NULL) {
1532 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PARSE_STOC_ALPN,
1533 ERR_R_INTERNAL_ERROR);
1536 if (!PACKET_copy_bytes(pkt, s->s3->alpn_selected, len)) {
1537 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PARSE_STOC_ALPN,
1538 SSL_R_BAD_EXTENSION);
1541 s->s3->alpn_selected_len = len;
1543 if (s->session->ext.alpn_selected == NULL
1544 || s->session->ext.alpn_selected_len != len
1545 || memcmp(s->session->ext.alpn_selected, s->s3->alpn_selected, len)
1547 /* ALPN not consistent with the old session so cannot use early_data */
1548 s->ext.early_data_ok = 0;
1551 /* If a new session then update it with the selected ALPN */
1552 s->session->ext.alpn_selected =
1553 OPENSSL_memdup(s->s3->alpn_selected, s->s3->alpn_selected_len);
1554 if (s->session->ext.alpn_selected == NULL) {
1555 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PARSE_STOC_ALPN,
1556 ERR_R_INTERNAL_ERROR);
1559 s->session->ext.alpn_selected_len = s->s3->alpn_selected_len;
1565 #ifndef OPENSSL_NO_SRTP
1566 int tls_parse_stoc_use_srtp(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
1569 unsigned int id, ct, mki;
1571 STACK_OF(SRTP_PROTECTION_PROFILE) *clnt;
1572 SRTP_PROTECTION_PROFILE *prof;
1574 if (!PACKET_get_net_2(pkt, &ct) || ct != 2
1575 || !PACKET_get_net_2(pkt, &id)
1576 || !PACKET_get_1(pkt, &mki)
1577 || PACKET_remaining(pkt) != 0) {
1578 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PARSE_STOC_USE_SRTP,
1579 SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST);
1584 /* Must be no MKI, since we never offer one */
1585 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_F_TLS_PARSE_STOC_USE_SRTP,
1586 SSL_R_BAD_SRTP_MKI_VALUE);
1590 /* Throw an error if the server gave us an unsolicited extension */
1591 clnt = SSL_get_srtp_profiles(s);
1593 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PARSE_STOC_USE_SRTP,
1594 SSL_R_NO_SRTP_PROFILES);
1599 * Check to see if the server gave us something we support (and
1600 * presumably offered)
1602 for (i = 0; i < sk_SRTP_PROTECTION_PROFILE_num(clnt); i++) {
1603 prof = sk_SRTP_PROTECTION_PROFILE_value(clnt, i);
1605 if (prof->id == id) {
1606 s->srtp_profile = prof;
1611 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PARSE_STOC_USE_SRTP,
1612 SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST);
1617 int tls_parse_stoc_etm(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
1620 /* Ignore if inappropriate ciphersuite */
1621 if (!(s->options & SSL_OP_NO_ENCRYPT_THEN_MAC)
1622 && s->s3->tmp.new_cipher->algorithm_mac != SSL_AEAD
1623 && s->s3->tmp.new_cipher->algorithm_enc != SSL_RC4)
1629 int tls_parse_stoc_ems(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
1632 s->s3->flags |= TLS1_FLAGS_RECEIVED_EXTMS;
1634 s->session->flags |= SSL_SESS_FLAG_EXTMS;
1639 int tls_parse_stoc_key_share(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
1642 #ifndef OPENSSL_NO_TLS1_3
1643 unsigned int group_id;
1645 EVP_PKEY *ckey = s->s3->tmp.pkey, *skey = NULL;
1648 if (ckey == NULL || s->s3->peer_tmp != NULL) {
1649 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PARSE_STOC_KEY_SHARE,
1650 ERR_R_INTERNAL_ERROR);
1654 if (!PACKET_get_net_2(pkt, &group_id)) {
1655 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PARSE_STOC_KEY_SHARE,
1656 SSL_R_LENGTH_MISMATCH);
1660 if ((context & SSL_EXT_TLS1_3_HELLO_RETRY_REQUEST) != 0) {
1661 const uint16_t *pgroups = NULL;
1662 size_t i, num_groups;
1664 if (PACKET_remaining(pkt) != 0) {
1665 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PARSE_STOC_KEY_SHARE,
1666 SSL_R_LENGTH_MISMATCH);
1671 * It is an error if the HelloRetryRequest wants a key_share that we
1672 * already sent in the first ClientHello
1674 if (group_id == s->s3->group_id) {
1675 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER,
1676 SSL_F_TLS_PARSE_STOC_KEY_SHARE, SSL_R_BAD_KEY_SHARE);
1680 /* Validate the selected group is one we support */
1681 tls1_get_supported_groups(s, &pgroups, &num_groups);
1682 for (i = 0; i < num_groups; i++) {
1683 if (group_id == pgroups[i])
1687 || !tls_curve_allowed(s, group_id, SSL_SECOP_CURVE_SUPPORTED)) {
1688 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER,
1689 SSL_F_TLS_PARSE_STOC_KEY_SHARE, SSL_R_BAD_KEY_SHARE);
1693 s->s3->group_id = group_id;
1694 EVP_PKEY_free(s->s3->tmp.pkey);
1695 s->s3->tmp.pkey = NULL;
1699 if (group_id != s->s3->group_id) {
1701 * This isn't for the group that we sent in the original
1704 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_F_TLS_PARSE_STOC_KEY_SHARE,
1705 SSL_R_BAD_KEY_SHARE);
1709 if (!PACKET_as_length_prefixed_2(pkt, &encoded_pt)
1710 || PACKET_remaining(&encoded_pt) == 0) {
1711 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PARSE_STOC_KEY_SHARE,
1712 SSL_R_LENGTH_MISMATCH);
1716 skey = ssl_generate_pkey(ckey);
1718 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PARSE_STOC_KEY_SHARE,
1719 ERR_R_MALLOC_FAILURE);
1722 if (!EVP_PKEY_set1_tls_encodedpoint(skey, PACKET_data(&encoded_pt),
1723 PACKET_remaining(&encoded_pt))) {
1724 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_F_TLS_PARSE_STOC_KEY_SHARE,
1726 EVP_PKEY_free(skey);
1730 if (ssl_derive(s, ckey, skey, 1) == 0) {
1731 /* SSLfatal() already called */
1732 EVP_PKEY_free(skey);
1735 s->s3->peer_tmp = skey;
1741 int tls_parse_stoc_cookie(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
1746 if (!PACKET_as_length_prefixed_2(pkt, &cookie)
1747 || !PACKET_memdup(&cookie, &s->ext.tls13_cookie,
1748 &s->ext.tls13_cookie_len)) {
1749 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PARSE_STOC_COOKIE,
1750 SSL_R_LENGTH_MISMATCH);
1757 int tls_parse_stoc_early_data(SSL *s, PACKET *pkt, unsigned int context,
1758 X509 *x, size_t chainidx)
1760 if (context == SSL_EXT_TLS1_3_NEW_SESSION_TICKET) {
1761 unsigned long max_early_data;
1763 if (!PACKET_get_net_4(pkt, &max_early_data)
1764 || PACKET_remaining(pkt) != 0) {
1765 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PARSE_STOC_EARLY_DATA,
1766 SSL_R_INVALID_MAX_EARLY_DATA);
1770 s->session->ext.max_early_data = max_early_data;
1775 if (PACKET_remaining(pkt) != 0) {
1776 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PARSE_STOC_EARLY_DATA,
1777 SSL_R_BAD_EXTENSION);
1781 if (!s->ext.early_data_ok
1783 || s->session->ext.tick_identity != 0) {
1785 * If we get here then we didn't send early data, or we didn't resume
1786 * using the first identity, or the SNI/ALPN is not consistent so the
1787 * server should not be accepting it.
1789 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_F_TLS_PARSE_STOC_EARLY_DATA,
1790 SSL_R_BAD_EXTENSION);
1794 s->ext.early_data = SSL_EARLY_DATA_ACCEPTED;
1799 int tls_parse_stoc_psk(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
1802 #ifndef OPENSSL_NO_TLS1_3
1803 unsigned int identity;
1805 if (!PACKET_get_net_2(pkt, &identity) || PACKET_remaining(pkt) != 0) {
1806 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PARSE_STOC_PSK,
1807 SSL_R_LENGTH_MISMATCH);
1811 if (s->session->ext.tick_identity == (int)identity) {
1813 SSL_SESSION_free(s->psksession);
1814 s->psksession = NULL;
1818 if (s->psksession == NULL
1819 || s->psksession->ext.tick_identity != (int)identity) {
1820 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_F_TLS_PARSE_STOC_PSK,
1821 SSL_R_BAD_PSK_IDENTITY);
1826 * If we used the external PSK for sending early_data then s->early_secret
1827 * is already set up, so don't overwrite it. Otherwise we copy the
1828 * early_secret across that we generated earlier.
1830 if ((s->early_data_state != SSL_EARLY_DATA_WRITE_RETRY
1831 && s->early_data_state != SSL_EARLY_DATA_FINISHED_WRITING)
1832 || s->session->ext.max_early_data > 0
1833 || s->psksession->ext.max_early_data == 0)
1834 memcpy(s->early_secret, s->psksession->early_secret, EVP_MAX_MD_SIZE);
1836 SSL_SESSION_free(s->session);
1837 s->session = s->psksession;
1838 s->psksession = NULL;