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,
17 size_t chainidx, int *al)
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 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_RENEGOTIATE, ERR_R_INTERNAL_ERROR);
29 return EXT_RETURN_FAIL;
32 return EXT_RETURN_SENT;
35 EXT_RETURN tls_construct_ctos_server_name(SSL *s, WPACKET *pkt,
36 unsigned int context, X509 *x,
37 size_t chainidx, int *al)
39 if (s->ext.hostname == NULL)
40 return EXT_RETURN_NOT_SENT;
42 /* Add TLS extension servername to the Client Hello message */
43 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_server_name)
44 /* Sub-packet for server_name extension */
45 || !WPACKET_start_sub_packet_u16(pkt)
46 /* Sub-packet for servername list (always 1 hostname)*/
47 || !WPACKET_start_sub_packet_u16(pkt)
48 || !WPACKET_put_bytes_u8(pkt, TLSEXT_NAMETYPE_host_name)
49 || !WPACKET_sub_memcpy_u16(pkt, s->ext.hostname,
50 strlen(s->ext.hostname))
51 || !WPACKET_close(pkt)
52 || !WPACKET_close(pkt)) {
53 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SERVER_NAME, ERR_R_INTERNAL_ERROR);
54 return EXT_RETURN_FAIL;
57 return EXT_RETURN_SENT;
60 /* Push a Max Fragment Len extension into ClientHello */
61 EXT_RETURN tls_construct_ctos_maxfragmentlen(SSL *s, WPACKET *pkt,
62 unsigned int context, X509 *x,
63 size_t chainidx, int *al)
65 if (s->ext.max_fragment_len_mode == TLSEXT_max_fragment_length_DISABLED)
66 return EXT_RETURN_NOT_SENT;
68 /* Add Max Fragment Length extension if client enabled it. */
70 * 4 bytes for this extension type and extension length
71 * 1 byte for the Max Fragment Length code value.
73 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_max_fragment_length)
74 /* Sub-packet for Max Fragment Length extension (1 byte) */
75 || !WPACKET_start_sub_packet_u16(pkt)
76 || !WPACKET_put_bytes_u8(pkt, s->ext.max_fragment_len_mode)
77 || !WPACKET_close(pkt)) {
78 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_MAXFRAGMENTLEN, ERR_R_INTERNAL_ERROR);
79 return EXT_RETURN_FAIL;
82 return EXT_RETURN_SENT;
85 #ifndef OPENSSL_NO_SRP
86 EXT_RETURN tls_construct_ctos_srp(SSL *s, WPACKET *pkt, unsigned int context,
87 X509 *x, size_t chainidx, int *al)
89 /* Add SRP username if there is one */
90 if (s->srp_ctx.login == NULL)
91 return EXT_RETURN_NOT_SENT;
93 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_srp)
94 /* Sub-packet for SRP extension */
95 || !WPACKET_start_sub_packet_u16(pkt)
96 || !WPACKET_start_sub_packet_u8(pkt)
97 /* login must not be zero...internal error if so */
98 || !WPACKET_set_flags(pkt, WPACKET_FLAGS_NON_ZERO_LENGTH)
99 || !WPACKET_memcpy(pkt, s->srp_ctx.login,
100 strlen(s->srp_ctx.login))
101 || !WPACKET_close(pkt)
102 || !WPACKET_close(pkt)) {
103 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SRP, ERR_R_INTERNAL_ERROR);
104 return EXT_RETURN_FAIL;
107 return EXT_RETURN_SENT;
111 #ifndef OPENSSL_NO_EC
112 static int use_ecc(SSL *s)
115 unsigned long alg_k, alg_a;
116 STACK_OF(SSL_CIPHER) *cipher_stack = NULL;
118 /* See if we support any ECC ciphersuites */
119 if (s->version == SSL3_VERSION)
122 cipher_stack = SSL_get_ciphers(s);
123 end = sk_SSL_CIPHER_num(cipher_stack);
124 for (i = 0; i < end; i++) {
125 const SSL_CIPHER *c = sk_SSL_CIPHER_value(cipher_stack, i);
127 alg_k = c->algorithm_mkey;
128 alg_a = c->algorithm_auth;
129 if ((alg_k & (SSL_kECDHE | SSL_kECDHEPSK))
130 || (alg_a & SSL_aECDSA)
131 || c->min_tls >= TLS1_3_VERSION)
138 EXT_RETURN tls_construct_ctos_ec_pt_formats(SSL *s, WPACKET *pkt,
139 unsigned int context, X509 *x,
140 size_t chainidx, int *al)
142 const unsigned char *pformats;
146 return EXT_RETURN_NOT_SENT;
148 /* Add TLS extension ECPointFormats to the ClientHello message */
149 tls1_get_formatlist(s, &pformats, &num_formats);
151 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_ec_point_formats)
152 /* Sub-packet for formats extension */
153 || !WPACKET_start_sub_packet_u16(pkt)
154 || !WPACKET_sub_memcpy_u8(pkt, pformats, num_formats)
155 || !WPACKET_close(pkt)) {
156 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_EC_PT_FORMATS, ERR_R_INTERNAL_ERROR);
157 return EXT_RETURN_FAIL;
160 return EXT_RETURN_SENT;
163 EXT_RETURN tls_construct_ctos_supported_groups(SSL *s, WPACKET *pkt,
164 unsigned int context, X509 *x,
165 size_t chainidx, int *al)
167 const uint16_t *pgroups = NULL;
168 size_t num_groups = 0, i;
171 return EXT_RETURN_NOT_SENT;
174 * Add TLS extension supported_groups to the ClientHello message
176 /* TODO(TLS1.3): Add support for DHE groups */
177 tls1_get_supported_groups(s, &pgroups, &num_groups);
179 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_supported_groups)
180 /* Sub-packet for supported_groups extension */
181 || !WPACKET_start_sub_packet_u16(pkt)
182 || !WPACKET_start_sub_packet_u16(pkt)) {
183 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_GROUPS,
184 ERR_R_INTERNAL_ERROR);
185 return EXT_RETURN_FAIL;
187 /* Copy curve ID if supported */
188 for (i = 0; i < num_groups; i++) {
189 uint16_t ctmp = pgroups[i];
191 if (tls_curve_allowed(s, ctmp, SSL_SECOP_CURVE_SUPPORTED)) {
192 if (!WPACKET_put_bytes_u16(pkt, ctmp)) {
193 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_GROUPS,
194 ERR_R_INTERNAL_ERROR);
195 return EXT_RETURN_FAIL;
199 if (!WPACKET_close(pkt) || !WPACKET_close(pkt)) {
200 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_GROUPS,
201 ERR_R_INTERNAL_ERROR);
202 return EXT_RETURN_FAIL;
205 return EXT_RETURN_SENT;
209 EXT_RETURN tls_construct_ctos_session_ticket(SSL *s, WPACKET *pkt,
210 unsigned int context, X509 *x,
211 size_t chainidx, int *al)
215 if (!tls_use_ticket(s))
216 return EXT_RETURN_NOT_SENT;
218 if (!s->new_session && s->session != NULL
219 && s->session->ext.tick != NULL
220 && s->session->ssl_version != TLS1_3_VERSION) {
221 ticklen = s->session->ext.ticklen;
222 } else if (s->session && s->ext.session_ticket != NULL
223 && s->ext.session_ticket->data != NULL) {
224 ticklen = s->ext.session_ticket->length;
225 s->session->ext.tick = OPENSSL_malloc(ticklen);
226 if (s->session->ext.tick == NULL) {
227 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SESSION_TICKET,
228 ERR_R_INTERNAL_ERROR);
229 return EXT_RETURN_FAIL;
231 memcpy(s->session->ext.tick,
232 s->ext.session_ticket->data, ticklen);
233 s->session->ext.ticklen = ticklen;
238 if (ticklen == 0 && s->ext.session_ticket != NULL &&
239 s->ext.session_ticket->data == NULL)
240 return EXT_RETURN_NOT_SENT;
242 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_session_ticket)
243 || !WPACKET_sub_memcpy_u16(pkt, s->session->ext.tick, ticklen)) {
244 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SESSION_TICKET, ERR_R_INTERNAL_ERROR);
245 return EXT_RETURN_FAIL;
248 return EXT_RETURN_SENT;
251 EXT_RETURN tls_construct_ctos_sig_algs(SSL *s, WPACKET *pkt,
252 unsigned int context, X509 *x,
253 size_t chainidx, int *al)
256 const uint16_t *salg;
258 if (!SSL_CLIENT_USE_SIGALGS(s))
259 return EXT_RETURN_NOT_SENT;
261 salglen = tls12_get_psigalgs(s, 1, &salg);
262 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_signature_algorithms)
263 /* Sub-packet for sig-algs extension */
264 || !WPACKET_start_sub_packet_u16(pkt)
265 /* Sub-packet for the actual list */
266 || !WPACKET_start_sub_packet_u16(pkt)
267 || !tls12_copy_sigalgs(s, pkt, salg, salglen)
268 || !WPACKET_close(pkt)
269 || !WPACKET_close(pkt)) {
270 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SIG_ALGS, ERR_R_INTERNAL_ERROR);
271 return EXT_RETURN_FAIL;
274 return EXT_RETURN_SENT;
277 #ifndef OPENSSL_NO_OCSP
278 EXT_RETURN tls_construct_ctos_status_request(SSL *s, WPACKET *pkt,
279 unsigned int context, X509 *x,
280 size_t chainidx, int *al)
284 /* This extension isn't defined for client Certificates */
286 return EXT_RETURN_NOT_SENT;
288 if (s->ext.status_type != TLSEXT_STATUSTYPE_ocsp)
289 return EXT_RETURN_NOT_SENT;
291 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_status_request)
292 /* Sub-packet for status request extension */
293 || !WPACKET_start_sub_packet_u16(pkt)
294 || !WPACKET_put_bytes_u8(pkt, TLSEXT_STATUSTYPE_ocsp)
295 /* Sub-packet for the ids */
296 || !WPACKET_start_sub_packet_u16(pkt)) {
297 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_STATUS_REQUEST, ERR_R_INTERNAL_ERROR);
298 return EXT_RETURN_FAIL;
300 for (i = 0; i < sk_OCSP_RESPID_num(s->ext.ocsp.ids); i++) {
301 unsigned char *idbytes;
302 OCSP_RESPID *id = sk_OCSP_RESPID_value(s->ext.ocsp.ids, i);
303 int idlen = i2d_OCSP_RESPID(id, NULL);
306 /* Sub-packet for an individual id */
307 || !WPACKET_sub_allocate_bytes_u16(pkt, idlen, &idbytes)
308 || i2d_OCSP_RESPID(id, &idbytes) != idlen) {
309 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_STATUS_REQUEST,
310 ERR_R_INTERNAL_ERROR);
311 return EXT_RETURN_FAIL;
314 if (!WPACKET_close(pkt)
315 || !WPACKET_start_sub_packet_u16(pkt)) {
316 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_STATUS_REQUEST, ERR_R_INTERNAL_ERROR);
317 return EXT_RETURN_FAIL;
319 if (s->ext.ocsp.exts) {
320 unsigned char *extbytes;
321 int extlen = i2d_X509_EXTENSIONS(s->ext.ocsp.exts, NULL);
324 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_STATUS_REQUEST,
325 ERR_R_INTERNAL_ERROR);
326 return EXT_RETURN_FAIL;
328 if (!WPACKET_allocate_bytes(pkt, extlen, &extbytes)
329 || i2d_X509_EXTENSIONS(s->ext.ocsp.exts, &extbytes)
331 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_STATUS_REQUEST,
332 ERR_R_INTERNAL_ERROR);
333 return EXT_RETURN_FAIL;
336 if (!WPACKET_close(pkt) || !WPACKET_close(pkt)) {
337 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_STATUS_REQUEST, ERR_R_INTERNAL_ERROR);
338 return EXT_RETURN_FAIL;
341 return EXT_RETURN_SENT;
345 #ifndef OPENSSL_NO_NEXTPROTONEG
346 EXT_RETURN tls_construct_ctos_npn(SSL *s, WPACKET *pkt, unsigned int context,
347 X509 *x, size_t chainidx, int *al)
349 if (s->ctx->ext.npn_select_cb == NULL || !SSL_IS_FIRST_HANDSHAKE(s))
350 return EXT_RETURN_NOT_SENT;
353 * The client advertises an empty extension to indicate its support
354 * for Next Protocol Negotiation
356 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_next_proto_neg)
357 || !WPACKET_put_bytes_u16(pkt, 0)) {
358 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_NPN, ERR_R_INTERNAL_ERROR);
359 return EXT_RETURN_FAIL;
362 return EXT_RETURN_SENT;
366 EXT_RETURN tls_construct_ctos_alpn(SSL *s, WPACKET *pkt, unsigned int context,
367 X509 *x, size_t chainidx, int *al)
369 s->s3->alpn_sent = 0;
371 if (s->ext.alpn == NULL || !SSL_IS_FIRST_HANDSHAKE(s))
372 return EXT_RETURN_NOT_SENT;
374 if (!WPACKET_put_bytes_u16(pkt,
375 TLSEXT_TYPE_application_layer_protocol_negotiation)
376 /* Sub-packet ALPN extension */
377 || !WPACKET_start_sub_packet_u16(pkt)
378 || !WPACKET_sub_memcpy_u16(pkt, s->ext.alpn, s->ext.alpn_len)
379 || !WPACKET_close(pkt)) {
380 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_ALPN, ERR_R_INTERNAL_ERROR);
381 return EXT_RETURN_FAIL;
383 s->s3->alpn_sent = 1;
385 return EXT_RETURN_SENT;
389 #ifndef OPENSSL_NO_SRTP
390 EXT_RETURN tls_construct_ctos_use_srtp(SSL *s, WPACKET *pkt,
391 unsigned int context, X509 *x,
392 size_t chainidx, int *al)
394 STACK_OF(SRTP_PROTECTION_PROFILE) *clnt = SSL_get_srtp_profiles(s);
398 return EXT_RETURN_NOT_SENT;
400 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_use_srtp)
401 /* Sub-packet for SRTP extension */
402 || !WPACKET_start_sub_packet_u16(pkt)
403 /* Sub-packet for the protection profile list */
404 || !WPACKET_start_sub_packet_u16(pkt)) {
405 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_USE_SRTP, ERR_R_INTERNAL_ERROR);
406 return EXT_RETURN_FAIL;
409 end = sk_SRTP_PROTECTION_PROFILE_num(clnt);
410 for (i = 0; i < end; i++) {
411 const SRTP_PROTECTION_PROFILE *prof =
412 sk_SRTP_PROTECTION_PROFILE_value(clnt, i);
414 if (prof == NULL || !WPACKET_put_bytes_u16(pkt, prof->id)) {
415 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_USE_SRTP, ERR_R_INTERNAL_ERROR);
416 return EXT_RETURN_FAIL;
419 if (!WPACKET_close(pkt)
420 /* Add an empty use_mki value */
421 || !WPACKET_put_bytes_u8(pkt, 0)
422 || !WPACKET_close(pkt)) {
423 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_USE_SRTP, ERR_R_INTERNAL_ERROR);
424 return EXT_RETURN_FAIL;
427 return EXT_RETURN_SENT;
431 EXT_RETURN tls_construct_ctos_etm(SSL *s, WPACKET *pkt, unsigned int context,
432 X509 *x, size_t chainidx, int *al)
434 if (s->options & SSL_OP_NO_ENCRYPT_THEN_MAC)
435 return EXT_RETURN_NOT_SENT;
437 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_encrypt_then_mac)
438 || !WPACKET_put_bytes_u16(pkt, 0)) {
439 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_ETM, ERR_R_INTERNAL_ERROR);
440 return EXT_RETURN_FAIL;
443 return EXT_RETURN_SENT;
446 #ifndef OPENSSL_NO_CT
447 EXT_RETURN tls_construct_ctos_sct(SSL *s, WPACKET *pkt, unsigned int context,
448 X509 *x, size_t chainidx, int *al)
450 if (s->ct_validation_callback == NULL)
451 return EXT_RETURN_NOT_SENT;
453 /* Not defined for client Certificates */
455 return EXT_RETURN_NOT_SENT;
457 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_signed_certificate_timestamp)
458 || !WPACKET_put_bytes_u16(pkt, 0)) {
459 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SCT, ERR_R_INTERNAL_ERROR);
460 return EXT_RETURN_FAIL;
463 return EXT_RETURN_SENT;
467 EXT_RETURN tls_construct_ctos_ems(SSL *s, WPACKET *pkt, unsigned int context,
468 X509 *x, size_t chainidx, int *al)
470 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_extended_master_secret)
471 || !WPACKET_put_bytes_u16(pkt, 0)) {
472 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_EMS, ERR_R_INTERNAL_ERROR);
473 return EXT_RETURN_FAIL;
476 return EXT_RETURN_SENT;
479 EXT_RETURN tls_construct_ctos_supported_versions(SSL *s, WPACKET *pkt,
480 unsigned int context, X509 *x,
481 size_t chainidx, int *al)
483 int currv, min_version, max_version, reason;
485 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_supported_versions)
486 || !WPACKET_start_sub_packet_u16(pkt)
487 || !WPACKET_start_sub_packet_u8(pkt)) {
488 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_VERSIONS,
489 ERR_R_INTERNAL_ERROR);
490 return EXT_RETURN_FAIL;
493 reason = ssl_get_min_max_version(s, &min_version, &max_version);
495 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_VERSIONS, reason);
496 return EXT_RETURN_FAIL;
500 * TODO(TLS1.3): There is some discussion on the TLS list as to whether
501 * we should include versions <TLS1.2. For the moment we do. To be
504 for (currv = max_version; currv >= min_version; currv--) {
505 /* TODO(TLS1.3): Remove this first if clause prior to release!! */
506 if (currv == TLS1_3_VERSION) {
507 if (!WPACKET_put_bytes_u16(pkt, TLS1_3_VERSION_DRAFT)) {
508 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_VERSIONS,
509 ERR_R_INTERNAL_ERROR);
510 return EXT_RETURN_FAIL;
512 } else if (!WPACKET_put_bytes_u16(pkt, currv)) {
513 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_VERSIONS,
514 ERR_R_INTERNAL_ERROR);
515 return EXT_RETURN_FAIL;
518 if (!WPACKET_close(pkt) || !WPACKET_close(pkt)) {
519 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_VERSIONS,
520 ERR_R_INTERNAL_ERROR);
521 return EXT_RETURN_FAIL;
524 return EXT_RETURN_SENT;
528 * Construct a psk_kex_modes extension.
530 EXT_RETURN tls_construct_ctos_psk_kex_modes(SSL *s, WPACKET *pkt,
531 unsigned int context, X509 *x,
532 size_t chainidx, int *al)
534 #ifndef OPENSSL_NO_TLS1_3
535 int nodhe = s->options & SSL_OP_ALLOW_NO_DHE_KEX;
537 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_psk_kex_modes)
538 || !WPACKET_start_sub_packet_u16(pkt)
539 || !WPACKET_start_sub_packet_u8(pkt)
540 || !WPACKET_put_bytes_u8(pkt, TLSEXT_KEX_MODE_KE_DHE)
541 || (nodhe && !WPACKET_put_bytes_u8(pkt, TLSEXT_KEX_MODE_KE))
542 || !WPACKET_close(pkt)
543 || !WPACKET_close(pkt)) {
544 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_PSK_KEX_MODES, ERR_R_INTERNAL_ERROR);
545 return EXT_RETURN_FAIL;
548 s->ext.psk_kex_mode = TLSEXT_KEX_MODE_FLAG_KE_DHE;
550 s->ext.psk_kex_mode |= TLSEXT_KEX_MODE_FLAG_KE;
553 return EXT_RETURN_SENT;
556 #ifndef OPENSSL_NO_TLS1_3
557 static int add_key_share(SSL *s, WPACKET *pkt, unsigned int curve_id)
559 unsigned char *encoded_point = NULL;
560 EVP_PKEY *key_share_key = NULL;
563 if (s->s3->tmp.pkey != NULL) {
564 if (!ossl_assert(s->hello_retry_request)) {
565 SSLerr(SSL_F_ADD_KEY_SHARE, ERR_R_INTERNAL_ERROR);
569 * Could happen if we got an HRR that wasn't requesting a new key_share
571 key_share_key = s->s3->tmp.pkey;
573 key_share_key = ssl_generate_pkey_group(curve_id);
574 if (key_share_key == NULL) {
575 SSLerr(SSL_F_ADD_KEY_SHARE, ERR_R_EVP_LIB);
580 /* Encode the public key. */
581 encodedlen = EVP_PKEY_get1_tls_encodedpoint(key_share_key,
583 if (encodedlen == 0) {
584 SSLerr(SSL_F_ADD_KEY_SHARE, ERR_R_EC_LIB);
588 /* Create KeyShareEntry */
589 if (!WPACKET_put_bytes_u16(pkt, curve_id)
590 || !WPACKET_sub_memcpy_u16(pkt, encoded_point, encodedlen)) {
591 SSLerr(SSL_F_ADD_KEY_SHARE, ERR_R_INTERNAL_ERROR);
596 * TODO(TLS1.3): When changing to send more than one key_share we're
597 * going to need to be able to save more than one EVP_PKEY. For now
598 * we reuse the existing tmp.pkey
600 s->s3->tmp.pkey = key_share_key;
601 s->s3->group_id = curve_id;
602 OPENSSL_free(encoded_point);
606 if (s->s3->tmp.pkey == NULL)
607 EVP_PKEY_free(key_share_key);
608 OPENSSL_free(encoded_point);
613 EXT_RETURN tls_construct_ctos_key_share(SSL *s, WPACKET *pkt,
614 unsigned int context, X509 *x,
615 size_t chainidx, int *al)
617 #ifndef OPENSSL_NO_TLS1_3
618 size_t i, num_groups = 0;
619 const uint16_t *pgroups = NULL;
620 uint16_t curve_id = 0;
622 /* key_share extension */
623 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_key_share)
624 /* Extension data sub-packet */
625 || !WPACKET_start_sub_packet_u16(pkt)
626 /* KeyShare list sub-packet */
627 || !WPACKET_start_sub_packet_u16(pkt)) {
628 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_KEY_SHARE, ERR_R_INTERNAL_ERROR);
629 return EXT_RETURN_FAIL;
632 tls1_get_supported_groups(s, &pgroups, &num_groups);
635 * TODO(TLS1.3): Make the number of key_shares sent configurable. For
638 if (s->s3->group_id != 0) {
639 curve_id = s->s3->group_id;
641 for (i = 0; i < num_groups; i++) {
643 if (!tls_curve_allowed(s, pgroups[i], SSL_SECOP_CURVE_SUPPORTED))
646 curve_id = pgroups[i];
652 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_KEY_SHARE, SSL_R_NO_SUITABLE_KEY_SHARE);
653 return EXT_RETURN_FAIL;
656 if (!add_key_share(s, pkt, curve_id))
657 return EXT_RETURN_FAIL;
659 if (!WPACKET_close(pkt) || !WPACKET_close(pkt)) {
660 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_KEY_SHARE, ERR_R_INTERNAL_ERROR);
661 return EXT_RETURN_FAIL;
665 return EXT_RETURN_SENT;
668 EXT_RETURN tls_construct_ctos_cookie(SSL *s, WPACKET *pkt, unsigned int context,
669 X509 *x, size_t chainidx, int *al)
671 EXT_RETURN ret = EXT_RETURN_FAIL;
673 /* Should only be set if we've had an HRR */
674 if (s->ext.tls13_cookie_len == 0)
675 return EXT_RETURN_NOT_SENT;
677 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_cookie)
678 /* Extension data sub-packet */
679 || !WPACKET_start_sub_packet_u16(pkt)
680 || !WPACKET_sub_memcpy_u16(pkt, s->ext.tls13_cookie,
681 s->ext.tls13_cookie_len)
682 || !WPACKET_close(pkt)) {
683 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_COOKIE, ERR_R_INTERNAL_ERROR);
687 ret = EXT_RETURN_SENT;
689 OPENSSL_free(s->ext.tls13_cookie);
690 s->ext.tls13_cookie = NULL;
691 s->ext.tls13_cookie_len = 0;
696 EXT_RETURN tls_construct_ctos_early_data(SSL *s, WPACKET *pkt,
697 unsigned int context, X509 *x,
698 size_t chainidx, int *al)
700 const unsigned char *id = NULL;
702 SSL_SESSION *psksess = NULL;
703 SSL_SESSION *edsess = NULL;
704 const EVP_MD *handmd = NULL;
706 if (s->hello_retry_request)
707 handmd = ssl_handshake_md(s);
709 if (s->psk_use_session_cb != NULL
710 && (!s->psk_use_session_cb(s, handmd, &id, &idlen, &psksess)
712 && psksess->ssl_version != TLS1_3_VERSION))) {
713 SSL_SESSION_free(psksess);
714 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_EARLY_DATA, SSL_R_BAD_PSK);
715 return EXT_RETURN_FAIL;
718 SSL_SESSION_free(s->psksession);
719 s->psksession = psksess;
720 if (psksess != NULL) {
721 OPENSSL_free(s->psksession_id);
722 s->psksession_id = OPENSSL_memdup(id, idlen);
723 if (s->psksession_id == NULL) {
724 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_EARLY_DATA, ERR_R_INTERNAL_ERROR);
725 return EXT_RETURN_FAIL;
727 s->psksession_id_len = idlen;
730 if (s->early_data_state != SSL_EARLY_DATA_CONNECTING
731 || (s->session->ext.max_early_data == 0
732 && (psksess == NULL || psksess->ext.max_early_data == 0))) {
733 s->max_early_data = 0;
734 return EXT_RETURN_NOT_SENT;
736 edsess = s->session->ext.max_early_data != 0 ? s->session : psksess;
737 s->max_early_data = edsess->ext.max_early_data;
739 if ((s->ext.hostname == NULL && edsess->ext.hostname != NULL)
740 || (s->ext.hostname != NULL
741 && (edsess->ext.hostname == NULL
742 || strcmp(s->ext.hostname, edsess->ext.hostname) != 0))) {
743 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_EARLY_DATA,
744 SSL_R_INCONSISTENT_EARLY_DATA_SNI);
745 return EXT_RETURN_FAIL;
748 if ((s->ext.alpn == NULL && edsess->ext.alpn_selected != NULL)) {
749 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_EARLY_DATA,
750 SSL_R_INCONSISTENT_EARLY_DATA_ALPN);
751 return EXT_RETURN_FAIL;
755 * Verify that we are offering an ALPN protocol consistent with the early
758 if (edsess->ext.alpn_selected != NULL) {
759 PACKET prots, alpnpkt;
762 if (!PACKET_buf_init(&prots, s->ext.alpn, s->ext.alpn_len)) {
763 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_EARLY_DATA, ERR_R_INTERNAL_ERROR);
764 return EXT_RETURN_FAIL;
766 while (PACKET_get_length_prefixed_1(&prots, &alpnpkt)) {
767 if (PACKET_equal(&alpnpkt, edsess->ext.alpn_selected,
768 edsess->ext.alpn_selected_len)) {
774 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_EARLY_DATA,
775 SSL_R_INCONSISTENT_EARLY_DATA_ALPN);
776 return EXT_RETURN_FAIL;
780 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_early_data)
781 || !WPACKET_start_sub_packet_u16(pkt)
782 || !WPACKET_close(pkt)) {
783 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_EARLY_DATA, ERR_R_INTERNAL_ERROR);
784 return EXT_RETURN_FAIL;
788 * We set this to rejected here. Later, if the server acknowledges the
789 * extension, we set it to accepted.
791 s->ext.early_data = SSL_EARLY_DATA_REJECTED;
792 s->ext.early_data_ok = 1;
794 return EXT_RETURN_SENT;
797 #define F5_WORKAROUND_MIN_MSG_LEN 0xff
798 #define F5_WORKAROUND_MAX_MSG_LEN 0x200
801 * PSK pre binder overhead =
802 * 2 bytes for TLSEXT_TYPE_psk
803 * 2 bytes for extension length
804 * 2 bytes for identities list length
805 * 2 bytes for identity length
806 * 4 bytes for obfuscated_ticket_age
807 * 2 bytes for binder list length
808 * 1 byte for binder length
809 * The above excludes the number of bytes for the identity itself and the
810 * subsequent binder bytes
812 #define PSK_PRE_BINDER_OVERHEAD (2 + 2 + 2 + 2 + 4 + 2 + 1)
814 EXT_RETURN tls_construct_ctos_padding(SSL *s, WPACKET *pkt,
815 unsigned int context, X509 *x,
816 size_t chainidx, int *al)
818 unsigned char *padbytes;
821 if ((s->options & SSL_OP_TLSEXT_PADDING) == 0)
822 return EXT_RETURN_NOT_SENT;
825 * Add padding to workaround bugs in F5 terminators. See RFC7685.
826 * This code calculates the length of all extensions added so far but
827 * excludes the PSK extension (because that MUST be written last). Therefore
828 * this extension MUST always appear second to last.
830 if (!WPACKET_get_total_written(pkt, &hlen)) {
831 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_PADDING, ERR_R_INTERNAL_ERROR);
832 return EXT_RETURN_FAIL;
836 * If we're going to send a PSK then that will be written out after this
837 * extension, so we need to calculate how long it is going to be.
839 if (s->session->ssl_version == TLS1_3_VERSION
840 && s->session->ext.ticklen != 0
841 && s->session->cipher != NULL) {
842 const EVP_MD *md = ssl_md(s->session->cipher->algorithm2);
846 * Add the fixed PSK overhead, the identity length and the binder
849 hlen += PSK_PRE_BINDER_OVERHEAD + s->session->ext.ticklen
854 if (hlen > F5_WORKAROUND_MIN_MSG_LEN && hlen < F5_WORKAROUND_MAX_MSG_LEN) {
855 /* Calculate the amount of padding we need to add */
856 hlen = F5_WORKAROUND_MAX_MSG_LEN - hlen;
859 * Take off the size of extension header itself (2 bytes for type and
860 * 2 bytes for length bytes), but ensure that the extension is at least
861 * 1 byte long so as not to have an empty extension last (WebSphere 7.x,
862 * 8.x are intolerant of that condition)
869 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_padding)
870 || !WPACKET_sub_allocate_bytes_u16(pkt, hlen, &padbytes)) {
871 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_PADDING, ERR_R_INTERNAL_ERROR);
872 return EXT_RETURN_FAIL;
874 memset(padbytes, 0, hlen);
877 return EXT_RETURN_SENT;
881 * Construct the pre_shared_key extension
883 EXT_RETURN tls_construct_ctos_psk(SSL *s, WPACKET *pkt, unsigned int context,
884 X509 *x, size_t chainidx, int *al)
886 #ifndef OPENSSL_NO_TLS1_3
887 uint32_t now, agesec, agems = 0;
888 size_t reshashsize = 0, pskhashsize = 0, binderoffset, msglen;
889 unsigned char *resbinder = NULL, *pskbinder = NULL, *msgstart = NULL;
890 const EVP_MD *handmd = NULL, *mdres = NULL, *mdpsk = NULL;
891 EXT_RETURN ret = EXT_RETURN_FAIL;
894 s->session->ext.tick_identity = TLSEXT_PSK_BAD_IDENTITY;
897 * Note: At this stage of the code we only support adding a single
898 * resumption PSK. If we add support for multiple PSKs then the length
899 * calculations in the padding extension will need to be adjusted.
903 * If this is an incompatible or new session then we have nothing to resume
904 * so don't add this extension.
906 if (s->session->ssl_version != TLS1_3_VERSION
907 || (s->session->ext.ticklen == 0 && s->psksession == NULL))
908 return EXT_RETURN_NOT_SENT;
910 if (s->hello_retry_request)
911 handmd = ssl_handshake_md(s);
913 if (s->session->ext.ticklen != 0) {
914 /* Get the digest associated with the ciphersuite in the session */
915 if (s->session->cipher == NULL) {
916 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_PSK, ERR_R_INTERNAL_ERROR);
919 mdres = ssl_md(s->session->cipher->algorithm2);
922 * Don't recognize this cipher so we can't use the session.
928 if (s->hello_retry_request && mdres != handmd) {
930 * Selected ciphersuite hash does not match the hash for the session
931 * so we can't use it.
937 * Technically the C standard just says time() returns a time_t and says
938 * nothing about the encoding of that type. In practice most
939 * implementations follow POSIX which holds it as an integral type in
940 * seconds since epoch. We've already made the assumption that we can do
941 * this in multiple places in the code, so portability shouldn't be an
944 now = (uint32_t)time(NULL);
945 agesec = now - (uint32_t)s->session->time;
947 if (s->session->ext.tick_lifetime_hint < agesec) {
948 /* Ticket is too old. Ignore it. */
953 * Calculate age in ms. We're just doing it to nearest second. Should be
956 agems = agesec * (uint32_t)1000;
958 if (agesec != 0 && agems / (uint32_t)1000 != agesec) {
960 * Overflow. Shouldn't happen unless this is a *really* old session.
961 * If so we just ignore it.
967 * Obfuscate the age. Overflow here is fine, this addition is supposed
970 agems += s->session->ext.tick_age_add;
972 reshashsize = EVP_MD_size(mdres);
977 if (!dores && s->psksession == NULL)
978 return EXT_RETURN_NOT_SENT;
980 if (s->psksession != NULL) {
981 mdpsk = ssl_md(s->psksession->cipher->algorithm2);
984 * Don't recognize this cipher so we can't use the session.
985 * If this happens it's an application bug.
987 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_PSK, SSL_R_BAD_PSK);
991 if (s->hello_retry_request && mdpsk != handmd) {
993 * Selected ciphersuite hash does not match the hash for the PSK
994 * session. This is an application bug.
996 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_PSK, SSL_R_BAD_PSK);
1000 pskhashsize = EVP_MD_size(mdpsk);
1003 /* Create the extension, but skip over the binder for now */
1004 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_psk)
1005 || !WPACKET_start_sub_packet_u16(pkt)
1006 || !WPACKET_start_sub_packet_u16(pkt)) {
1007 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_PSK, ERR_R_INTERNAL_ERROR);
1012 if (!WPACKET_sub_memcpy_u16(pkt, s->session->ext.tick,
1013 s->session->ext.ticklen)
1014 || !WPACKET_put_bytes_u32(pkt, agems)) {
1015 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_PSK, ERR_R_INTERNAL_ERROR);
1020 if (s->psksession != NULL) {
1021 if (!WPACKET_sub_memcpy_u16(pkt, s->psksession_id,
1022 s->psksession_id_len)
1023 || !WPACKET_put_bytes_u32(pkt, 0)) {
1024 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_PSK, ERR_R_INTERNAL_ERROR);
1029 if (!WPACKET_close(pkt)
1030 || !WPACKET_get_total_written(pkt, &binderoffset)
1031 || !WPACKET_start_sub_packet_u16(pkt)
1033 && !WPACKET_sub_allocate_bytes_u8(pkt, reshashsize, &resbinder))
1034 || (s->psksession != NULL
1035 && !WPACKET_sub_allocate_bytes_u8(pkt, pskhashsize, &pskbinder))
1036 || !WPACKET_close(pkt)
1037 || !WPACKET_close(pkt)
1038 || !WPACKET_get_total_written(pkt, &msglen)
1040 * We need to fill in all the sub-packet lengths now so we can
1041 * calculate the HMAC of the message up to the binders
1043 || !WPACKET_fill_lengths(pkt)) {
1044 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_PSK, ERR_R_INTERNAL_ERROR);
1048 msgstart = WPACKET_get_curr(pkt) - msglen;
1051 && tls_psk_do_binder(s, mdres, msgstart, binderoffset, NULL,
1052 resbinder, s->session, 1, 0) != 1) {
1053 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_PSK, ERR_R_INTERNAL_ERROR);
1057 if (s->psksession != NULL
1058 && tls_psk_do_binder(s, mdpsk, msgstart, binderoffset, NULL,
1059 pskbinder, s->psksession, 1, 1) != 1) {
1060 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_PSK, ERR_R_INTERNAL_ERROR);
1065 s->session->ext.tick_identity = 0;
1066 if (s->psksession != NULL)
1067 s->psksession->ext.tick_identity = (dores ? 1 : 0);
1069 ret = EXT_RETURN_SENT;
1073 return EXT_RETURN_NOT_SENT;
1078 * Parse the server's renegotiation binding and abort if it's not right
1080 int tls_parse_stoc_renegotiate(SSL *s, PACKET *pkt, unsigned int context,
1081 X509 *x, size_t chainidx, int *al)
1083 size_t expected_len = s->s3->previous_client_finished_len
1084 + s->s3->previous_server_finished_len;
1086 const unsigned char *data;
1088 /* Check for logic errors */
1089 if (!ossl_assert(expected_len == 0
1090 || s->s3->previous_client_finished_len != 0)
1091 || !ossl_assert(expected_len == 0
1092 || s->s3->previous_server_finished_len != 0)) {
1093 *al = SSL_AD_INTERNAL_ERROR;
1097 /* Parse the length byte */
1098 if (!PACKET_get_1_len(pkt, &ilen)) {
1099 SSLerr(SSL_F_TLS_PARSE_STOC_RENEGOTIATE,
1100 SSL_R_RENEGOTIATION_ENCODING_ERR);
1101 *al = SSL_AD_DECODE_ERROR;
1105 /* Consistency check */
1106 if (PACKET_remaining(pkt) != ilen) {
1107 SSLerr(SSL_F_TLS_PARSE_STOC_RENEGOTIATE,
1108 SSL_R_RENEGOTIATION_ENCODING_ERR);
1109 *al = SSL_AD_DECODE_ERROR;
1113 /* Check that the extension matches */
1114 if (ilen != expected_len) {
1115 SSLerr(SSL_F_TLS_PARSE_STOC_RENEGOTIATE,
1116 SSL_R_RENEGOTIATION_MISMATCH);
1117 *al = SSL_AD_ILLEGAL_PARAMETER;
1121 if (!PACKET_get_bytes(pkt, &data, s->s3->previous_client_finished_len)
1122 || memcmp(data, s->s3->previous_client_finished,
1123 s->s3->previous_client_finished_len) != 0) {
1124 SSLerr(SSL_F_TLS_PARSE_STOC_RENEGOTIATE,
1125 SSL_R_RENEGOTIATION_MISMATCH);
1126 *al = SSL_AD_ILLEGAL_PARAMETER;
1130 if (!PACKET_get_bytes(pkt, &data, s->s3->previous_server_finished_len)
1131 || memcmp(data, s->s3->previous_server_finished,
1132 s->s3->previous_server_finished_len) != 0) {
1133 SSLerr(SSL_F_TLS_PARSE_STOC_RENEGOTIATE,
1134 SSL_R_RENEGOTIATION_MISMATCH);
1135 *al = SSL_AD_ILLEGAL_PARAMETER;
1138 s->s3->send_connection_binding = 1;
1143 /* Parse the server's max fragment len extension packet */
1144 int tls_parse_stoc_maxfragmentlen(SSL *s, PACKET *pkt, unsigned int context,
1145 X509 *x, size_t chainidx, int *al)
1149 if (PACKET_remaining(pkt) != 1 || !PACKET_get_1(pkt, &value)) {
1150 *al = TLS1_AD_DECODE_ERROR;
1154 /* |value| should contains a valid max-fragment-length code. */
1155 if (!IS_MAX_FRAGMENT_LENGTH_EXT_VALID(value)) {
1156 *al = SSL_AD_ILLEGAL_PARAMETER;
1160 /* Must be the same value as client-configured one who was sent to server */
1162 * RFC 6066: if a client receives a maximum fragment length negotiation
1163 * response that differs from the length it requested, ...
1164 * It must abort with SSL_AD_ILLEGAL_PARAMETER alert
1166 if (value != s->ext.max_fragment_len_mode) {
1167 *al = SSL_AD_ILLEGAL_PARAMETER;
1172 * Maximum Fragment Length Negotiation succeeded.
1173 * The negotiated Maximum Fragment Length is binding now.
1175 s->session->ext.max_fragment_len_mode = value;
1180 int tls_parse_stoc_server_name(SSL *s, PACKET *pkt, unsigned int context,
1181 X509 *x, size_t chainidx, int *al)
1183 if (s->ext.hostname == NULL) {
1184 *al = SSL_AD_INTERNAL_ERROR;
1188 if (PACKET_remaining(pkt) > 0) {
1189 *al = SSL_AD_DECODE_ERROR;
1194 if (s->session->ext.hostname != NULL) {
1195 *al = SSL_AD_INTERNAL_ERROR;
1198 s->session->ext.hostname = OPENSSL_strdup(s->ext.hostname);
1199 if (s->session->ext.hostname == NULL) {
1200 *al = SSL_AD_INTERNAL_ERROR;
1208 #ifndef OPENSSL_NO_EC
1209 int tls_parse_stoc_ec_pt_formats(SSL *s, PACKET *pkt, unsigned int context,
1210 X509 *x, size_t chainidx, int *al)
1212 unsigned int ecpointformats_len;
1213 PACKET ecptformatlist;
1215 if (!PACKET_as_length_prefixed_1(pkt, &ecptformatlist)) {
1216 *al = SSL_AD_DECODE_ERROR;
1220 ecpointformats_len = PACKET_remaining(&ecptformatlist);
1221 s->session->ext.ecpointformats_len = 0;
1223 OPENSSL_free(s->session->ext.ecpointformats);
1224 s->session->ext.ecpointformats = OPENSSL_malloc(ecpointformats_len);
1225 if (s->session->ext.ecpointformats == NULL) {
1226 *al = SSL_AD_INTERNAL_ERROR;
1230 s->session->ext.ecpointformats_len = ecpointformats_len;
1232 if (!PACKET_copy_bytes(&ecptformatlist,
1233 s->session->ext.ecpointformats,
1234 ecpointformats_len)) {
1235 *al = SSL_AD_INTERNAL_ERROR;
1244 int tls_parse_stoc_session_ticket(SSL *s, PACKET *pkt, unsigned int context,
1245 X509 *x, size_t chainidx, int *al)
1247 if (s->ext.session_ticket_cb != NULL &&
1248 !s->ext.session_ticket_cb(s, PACKET_data(pkt),
1249 PACKET_remaining(pkt),
1250 s->ext.session_ticket_cb_arg)) {
1251 *al = SSL_AD_INTERNAL_ERROR;
1255 if (!tls_use_ticket(s)) {
1256 *al = SSL_AD_UNSUPPORTED_EXTENSION;
1259 if (PACKET_remaining(pkt) > 0) {
1260 *al = SSL_AD_DECODE_ERROR;
1264 s->ext.ticket_expected = 1;
1269 #ifndef OPENSSL_NO_OCSP
1270 int tls_parse_stoc_status_request(SSL *s, PACKET *pkt, unsigned int context,
1271 X509 *x, size_t chainidx, int *al)
1274 * MUST only be sent if we've requested a status
1275 * request message. In TLS <= 1.2 it must also be empty.
1277 if (s->ext.status_type != TLSEXT_STATUSTYPE_ocsp) {
1278 *al = SSL_AD_UNSUPPORTED_EXTENSION;
1281 if (!SSL_IS_TLS13(s) && PACKET_remaining(pkt) > 0) {
1282 *al = SSL_AD_DECODE_ERROR;
1286 if (SSL_IS_TLS13(s)) {
1287 /* We only know how to handle this if it's for the first Certificate in
1288 * the chain. We ignore any other responses.
1292 return tls_process_cert_status_body(s, pkt, al);
1295 /* Set flag to expect CertificateStatus message */
1296 s->ext.status_expected = 1;
1303 #ifndef OPENSSL_NO_CT
1304 int tls_parse_stoc_sct(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
1305 size_t chainidx, int *al)
1308 * Only take it if we asked for it - i.e if there is no CT validation
1309 * callback set, then a custom extension MAY be processing it, so we
1310 * need to let control continue to flow to that.
1312 if (s->ct_validation_callback != NULL) {
1313 size_t size = PACKET_remaining(pkt);
1315 /* Simply copy it off for later processing */
1316 OPENSSL_free(s->ext.scts);
1319 s->ext.scts_len = (uint16_t)size;
1321 s->ext.scts = OPENSSL_malloc(size);
1322 if (s->ext.scts == NULL
1323 || !PACKET_copy_bytes(pkt, s->ext.scts, size)) {
1324 *al = SSL_AD_INTERNAL_ERROR;
1329 ENDPOINT role = (context & SSL_EXT_TLS1_2_SERVER_HELLO) != 0
1330 ? ENDPOINT_CLIENT : ENDPOINT_BOTH;
1333 * If we didn't ask for it then there must be a custom extension,
1334 * otherwise this is unsolicited.
1336 if (custom_ext_find(&s->cert->custext, role,
1337 TLSEXT_TYPE_signed_certificate_timestamp,
1339 *al = TLS1_AD_UNSUPPORTED_EXTENSION;
1343 if (custom_ext_parse(s, context,
1344 TLSEXT_TYPE_signed_certificate_timestamp,
1345 PACKET_data(pkt), PACKET_remaining(pkt),
1346 x, chainidx, al) <= 0)
1355 #ifndef OPENSSL_NO_NEXTPROTONEG
1357 * ssl_next_proto_validate validates a Next Protocol Negotiation block. No
1358 * elements of zero length are allowed and the set of elements must exactly
1359 * fill the length of the block. Returns 1 on success or 0 on failure.
1361 static int ssl_next_proto_validate(PACKET *pkt)
1363 PACKET tmp_protocol;
1365 while (PACKET_remaining(pkt)) {
1366 if (!PACKET_get_length_prefixed_1(pkt, &tmp_protocol)
1367 || PACKET_remaining(&tmp_protocol) == 0)
1374 int tls_parse_stoc_npn(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
1375 size_t chainidx, int *al)
1377 unsigned char *selected;
1378 unsigned char selected_len;
1381 /* Check if we are in a renegotiation. If so ignore this extension */
1382 if (!SSL_IS_FIRST_HANDSHAKE(s))
1385 /* We must have requested it. */
1386 if (s->ctx->ext.npn_select_cb == NULL) {
1387 *al = SSL_AD_UNSUPPORTED_EXTENSION;
1391 /* The data must be valid */
1393 if (!ssl_next_proto_validate(&tmppkt)) {
1394 *al = SSL_AD_DECODE_ERROR;
1397 if (s->ctx->ext.npn_select_cb(s, &selected, &selected_len,
1399 PACKET_remaining(pkt),
1400 s->ctx->ext.npn_select_cb_arg) !=
1401 SSL_TLSEXT_ERR_OK) {
1402 *al = SSL_AD_INTERNAL_ERROR;
1407 * Could be non-NULL if server has sent multiple NPN extensions in
1408 * a single Serverhello
1410 OPENSSL_free(s->ext.npn);
1411 s->ext.npn = OPENSSL_malloc(selected_len);
1412 if (s->ext.npn == NULL) {
1413 *al = SSL_AD_INTERNAL_ERROR;
1417 memcpy(s->ext.npn, selected, selected_len);
1418 s->ext.npn_len = selected_len;
1419 s->s3->npn_seen = 1;
1425 int tls_parse_stoc_alpn(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
1426 size_t chainidx, int *al)
1430 /* We must have requested it. */
1431 if (!s->s3->alpn_sent) {
1432 *al = SSL_AD_UNSUPPORTED_EXTENSION;
1436 * The extension data consists of:
1437 * uint16 list_length
1438 * uint8 proto_length;
1439 * uint8 proto[proto_length];
1441 if (!PACKET_get_net_2_len(pkt, &len)
1442 || PACKET_remaining(pkt) != len || !PACKET_get_1_len(pkt, &len)
1443 || PACKET_remaining(pkt) != len) {
1444 *al = SSL_AD_DECODE_ERROR;
1447 OPENSSL_free(s->s3->alpn_selected);
1448 s->s3->alpn_selected = OPENSSL_malloc(len);
1449 if (s->s3->alpn_selected == NULL) {
1450 *al = SSL_AD_INTERNAL_ERROR;
1453 if (!PACKET_copy_bytes(pkt, s->s3->alpn_selected, len)) {
1454 *al = SSL_AD_DECODE_ERROR;
1457 s->s3->alpn_selected_len = len;
1459 if (s->session->ext.alpn_selected == NULL
1460 || s->session->ext.alpn_selected_len != len
1461 || memcmp(s->session->ext.alpn_selected, s->s3->alpn_selected, len)
1463 /* ALPN not consistent with the old session so cannot use early_data */
1464 s->ext.early_data_ok = 0;
1467 /* If a new session then update it with the selected ALPN */
1468 s->session->ext.alpn_selected =
1469 OPENSSL_memdup(s->s3->alpn_selected, s->s3->alpn_selected_len);
1470 if (s->session->ext.alpn_selected == NULL) {
1471 *al = SSL_AD_INTERNAL_ERROR;
1474 s->session->ext.alpn_selected_len = s->s3->alpn_selected_len;
1480 #ifndef OPENSSL_NO_SRTP
1481 int tls_parse_stoc_use_srtp(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
1482 size_t chainidx, int *al)
1484 unsigned int id, ct, mki;
1486 STACK_OF(SRTP_PROTECTION_PROFILE) *clnt;
1487 SRTP_PROTECTION_PROFILE *prof;
1489 if (!PACKET_get_net_2(pkt, &ct) || ct != 2
1490 || !PACKET_get_net_2(pkt, &id)
1491 || !PACKET_get_1(pkt, &mki)
1492 || PACKET_remaining(pkt) != 0) {
1493 SSLerr(SSL_F_TLS_PARSE_STOC_USE_SRTP,
1494 SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST);
1495 *al = SSL_AD_DECODE_ERROR;
1500 /* Must be no MKI, since we never offer one */
1501 SSLerr(SSL_F_TLS_PARSE_STOC_USE_SRTP, SSL_R_BAD_SRTP_MKI_VALUE);
1502 *al = SSL_AD_ILLEGAL_PARAMETER;
1506 /* Throw an error if the server gave us an unsolicited extension */
1507 clnt = SSL_get_srtp_profiles(s);
1509 SSLerr(SSL_F_TLS_PARSE_STOC_USE_SRTP, SSL_R_NO_SRTP_PROFILES);
1510 *al = SSL_AD_DECODE_ERROR;
1515 * Check to see if the server gave us something we support (and
1516 * presumably offered)
1518 for (i = 0; i < sk_SRTP_PROTECTION_PROFILE_num(clnt); i++) {
1519 prof = sk_SRTP_PROTECTION_PROFILE_value(clnt, i);
1521 if (prof->id == id) {
1522 s->srtp_profile = prof;
1528 SSLerr(SSL_F_TLS_PARSE_STOC_USE_SRTP,
1529 SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST);
1530 *al = SSL_AD_DECODE_ERROR;
1535 int tls_parse_stoc_etm(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
1536 size_t chainidx, int *al)
1538 /* Ignore if inappropriate ciphersuite */
1539 if (!(s->options & SSL_OP_NO_ENCRYPT_THEN_MAC)
1540 && s->s3->tmp.new_cipher->algorithm_mac != SSL_AEAD
1541 && s->s3->tmp.new_cipher->algorithm_enc != SSL_RC4)
1547 int tls_parse_stoc_ems(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
1548 size_t chainidx, int *al)
1550 s->s3->flags |= TLS1_FLAGS_RECEIVED_EXTMS;
1552 s->session->flags |= SSL_SESS_FLAG_EXTMS;
1557 int tls_parse_stoc_key_share(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
1558 size_t chainidx, int *al)
1560 #ifndef OPENSSL_NO_TLS1_3
1561 unsigned int group_id;
1563 EVP_PKEY *ckey = s->s3->tmp.pkey, *skey = NULL;
1566 if (ckey == NULL || s->s3->peer_tmp != NULL) {
1567 *al = SSL_AD_INTERNAL_ERROR;
1568 SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE, ERR_R_INTERNAL_ERROR);
1572 if (!PACKET_get_net_2(pkt, &group_id)) {
1573 *al = SSL_AD_DECODE_ERROR;
1574 SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE, SSL_R_LENGTH_MISMATCH);
1578 if ((context & SSL_EXT_TLS1_3_HELLO_RETRY_REQUEST) != 0) {
1579 const uint16_t *pgroups = NULL;
1580 size_t i, num_groups;
1582 if (PACKET_remaining(pkt) != 0) {
1583 *al = SSL_AD_DECODE_ERROR;
1584 SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE, SSL_R_LENGTH_MISMATCH);
1589 * It is an error if the HelloRetryRequest wants a key_share that we
1590 * already sent in the first ClientHello
1592 if (group_id == s->s3->group_id) {
1593 *al = SSL_AD_ILLEGAL_PARAMETER;
1594 SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE, SSL_R_BAD_KEY_SHARE);
1598 /* Validate the selected group is one we support */
1599 tls1_get_supported_groups(s, &pgroups, &num_groups);
1600 for (i = 0; i < num_groups; i++) {
1601 if (group_id == pgroups[i])
1605 || !tls_curve_allowed(s, group_id, SSL_SECOP_CURVE_SUPPORTED)) {
1606 *al = SSL_AD_ILLEGAL_PARAMETER;
1607 SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE, SSL_R_BAD_KEY_SHARE);
1611 s->s3->group_id = group_id;
1612 EVP_PKEY_free(s->s3->tmp.pkey);
1613 s->s3->tmp.pkey = NULL;
1617 if (group_id != s->s3->group_id) {
1619 * This isn't for the group that we sent in the original
1622 *al = SSL_AD_ILLEGAL_PARAMETER;
1623 SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE, SSL_R_BAD_KEY_SHARE);
1627 if (!PACKET_as_length_prefixed_2(pkt, &encoded_pt)
1628 || PACKET_remaining(&encoded_pt) == 0) {
1629 *al = SSL_AD_DECODE_ERROR;
1630 SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE, SSL_R_LENGTH_MISMATCH);
1634 skey = ssl_generate_pkey(ckey);
1636 *al = SSL_AD_INTERNAL_ERROR;
1637 SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE, ERR_R_MALLOC_FAILURE);
1640 if (!EVP_PKEY_set1_tls_encodedpoint(skey, PACKET_data(&encoded_pt),
1641 PACKET_remaining(&encoded_pt))) {
1642 *al = SSL_AD_ILLEGAL_PARAMETER;
1643 SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE, SSL_R_BAD_ECPOINT);
1644 EVP_PKEY_free(skey);
1648 if (ssl_derive(s, ckey, skey, 1) == 0) {
1649 *al = SSL_AD_INTERNAL_ERROR;
1650 SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE, ERR_R_INTERNAL_ERROR);
1651 EVP_PKEY_free(skey);
1654 s->s3->peer_tmp = skey;
1660 int tls_parse_stoc_cookie(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
1661 size_t chainidx, int *al)
1665 if (!PACKET_as_length_prefixed_2(pkt, &cookie)
1666 || !PACKET_memdup(&cookie, &s->ext.tls13_cookie,
1667 &s->ext.tls13_cookie_len)) {
1668 *al = SSL_AD_DECODE_ERROR;
1669 SSLerr(SSL_F_TLS_PARSE_STOC_COOKIE, SSL_R_LENGTH_MISMATCH);
1676 int tls_parse_stoc_early_data(SSL *s, PACKET *pkt, unsigned int context,
1677 X509 *x, size_t chainidx, int *al)
1679 if (context == SSL_EXT_TLS1_3_NEW_SESSION_TICKET) {
1680 unsigned long max_early_data;
1682 if (!PACKET_get_net_4(pkt, &max_early_data)
1683 || PACKET_remaining(pkt) != 0) {
1684 SSLerr(SSL_F_TLS_PARSE_STOC_EARLY_DATA,
1685 SSL_R_INVALID_MAX_EARLY_DATA);
1686 *al = SSL_AD_DECODE_ERROR;
1690 s->session->ext.max_early_data = max_early_data;
1695 if (PACKET_remaining(pkt) != 0) {
1696 *al = SSL_AD_DECODE_ERROR;
1700 if (!s->ext.early_data_ok
1702 || s->session->ext.tick_identity != 0) {
1704 * If we get here then we didn't send early data, or we didn't resume
1705 * using the first identity, or the SNI/ALPN is not consistent so the
1706 * server should not be accepting it.
1708 *al = SSL_AD_ILLEGAL_PARAMETER;
1712 s->ext.early_data = SSL_EARLY_DATA_ACCEPTED;
1717 int tls_parse_stoc_psk(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
1718 size_t chainidx, int *al)
1720 #ifndef OPENSSL_NO_TLS1_3
1721 unsigned int identity;
1723 if (!PACKET_get_net_2(pkt, &identity) || PACKET_remaining(pkt) != 0) {
1724 *al = SSL_AD_DECODE_ERROR;
1725 SSLerr(SSL_F_TLS_PARSE_STOC_PSK, SSL_R_LENGTH_MISMATCH);
1729 if (s->session->ext.tick_identity == (int)identity) {
1731 SSL_SESSION_free(s->psksession);
1732 s->psksession = NULL;
1736 if (s->psksession == NULL
1737 || s->psksession->ext.tick_identity != (int)identity) {
1738 *al = SSL_AD_ILLEGAL_PARAMETER;
1739 SSLerr(SSL_F_TLS_PARSE_STOC_PSK, SSL_R_BAD_PSK_IDENTITY);
1744 * If we used the external PSK for sending early_data then s->early_secret
1745 * is already set up, so don't overwrite it. Otherwise we copy the
1746 * early_secret across that we generated earlier.
1748 if ((s->early_data_state != SSL_EARLY_DATA_WRITE_RETRY
1749 && s->early_data_state != SSL_EARLY_DATA_FINISHED_WRITING)
1750 || s->session->ext.max_early_data > 0
1751 || s->psksession->ext.max_early_data == 0)
1752 memcpy(s->early_secret, s->psksession->early_secret, EVP_MAX_MD_SIZE);
1754 SSL_SESSION_free(s->session);
1755 s->session = s->psksession;
1756 s->psksession = NULL;