2 * Copyright 2016 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the OpenSSL license (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
11 #include <openssl/ocsp.h>
12 #include "../ssl_locl.h"
13 #include "statem_locl.h"
15 int tls_construct_ctos_renegotiate(SSL *s, WPACKET *pkt, unsigned int context,
16 X509 *x, size_t chainidx, int *al)
18 /* Add RI if renegotiating */
22 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_renegotiate)
23 || !WPACKET_start_sub_packet_u16(pkt)
24 || !WPACKET_sub_memcpy_u8(pkt, s->s3->previous_client_finished,
25 s->s3->previous_client_finished_len)
26 || !WPACKET_close(pkt)) {
27 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_RENEGOTIATE, ERR_R_INTERNAL_ERROR);
34 int tls_construct_ctos_server_name(SSL *s, WPACKET *pkt, unsigned int context,
35 X509 *x, size_t chainidx, int *al)
37 if (s->ext.hostname == NULL)
40 /* Add TLS extension servername to the Client Hello message */
41 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_server_name)
42 /* Sub-packet for server_name extension */
43 || !WPACKET_start_sub_packet_u16(pkt)
44 /* Sub-packet for servername list (always 1 hostname)*/
45 || !WPACKET_start_sub_packet_u16(pkt)
46 || !WPACKET_put_bytes_u8(pkt, TLSEXT_NAMETYPE_host_name)
47 || !WPACKET_sub_memcpy_u16(pkt, s->ext.hostname,
48 strlen(s->ext.hostname))
49 || !WPACKET_close(pkt)
50 || !WPACKET_close(pkt)) {
51 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SERVER_NAME, ERR_R_INTERNAL_ERROR);
58 #ifndef OPENSSL_NO_SRP
59 int tls_construct_ctos_srp(SSL *s, WPACKET *pkt, unsigned int context, X509 *x,
60 size_t chainidx, int *al)
62 /* Add SRP username if there is one */
63 if (s->srp_ctx.login == NULL)
66 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_srp)
67 /* Sub-packet for SRP extension */
68 || !WPACKET_start_sub_packet_u16(pkt)
69 || !WPACKET_start_sub_packet_u8(pkt)
70 /* login must not be zero...internal error if so */
71 || !WPACKET_set_flags(pkt, WPACKET_FLAGS_NON_ZERO_LENGTH)
72 || !WPACKET_memcpy(pkt, s->srp_ctx.login,
73 strlen(s->srp_ctx.login))
74 || !WPACKET_close(pkt)
75 || !WPACKET_close(pkt)) {
76 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SRP, ERR_R_INTERNAL_ERROR);
85 static int use_ecc(SSL *s)
88 unsigned long alg_k, alg_a;
89 STACK_OF(SSL_CIPHER) *cipher_stack = NULL;
91 /* See if we support any ECC ciphersuites */
92 if (s->version == SSL3_VERSION)
95 cipher_stack = SSL_get_ciphers(s);
96 end = sk_SSL_CIPHER_num(cipher_stack);
97 for (i = 0; i < end; i++) {
98 const SSL_CIPHER *c = sk_SSL_CIPHER_value(cipher_stack, i);
100 alg_k = c->algorithm_mkey;
101 alg_a = c->algorithm_auth;
102 if ((alg_k & (SSL_kECDHE | SSL_kECDHEPSK))
103 || (alg_a & SSL_aECDSA)
104 || c->min_tls >= TLS1_3_VERSION)
111 int tls_construct_ctos_ec_pt_formats(SSL *s, WPACKET *pkt, unsigned int context,
112 X509 *x, size_t chainidx, int *al)
114 const unsigned char *pformats;
120 /* Add TLS extension ECPointFormats to the ClientHello message */
121 tls1_get_formatlist(s, &pformats, &num_formats);
123 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_ec_point_formats)
124 /* Sub-packet for formats extension */
125 || !WPACKET_start_sub_packet_u16(pkt)
126 || !WPACKET_sub_memcpy_u8(pkt, pformats, num_formats)
127 || !WPACKET_close(pkt)) {
128 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_EC_PT_FORMATS, ERR_R_INTERNAL_ERROR);
135 int tls_construct_ctos_supported_groups(SSL *s, WPACKET *pkt,
136 unsigned int context, X509 *x,
137 size_t chainidx, int *al)
139 const unsigned char *pcurves = NULL, *pcurvestmp;
140 size_t num_curves = 0, i;
146 * Add TLS extension supported_groups to the ClientHello message
148 /* TODO(TLS1.3): Add support for DHE groups */
149 pcurves = s->ext.supportedgroups;
150 if (!tls1_get_curvelist(s, 0, &pcurves, &num_curves)) {
151 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_GROUPS,
152 ERR_R_INTERNAL_ERROR);
155 pcurvestmp = pcurves;
157 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_supported_groups)
158 /* Sub-packet for supported_groups extension */
159 || !WPACKET_start_sub_packet_u16(pkt)
160 || !WPACKET_start_sub_packet_u16(pkt)) {
161 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_GROUPS,
162 ERR_R_INTERNAL_ERROR);
165 /* Copy curve ID if supported */
166 for (i = 0; i < num_curves; i++, pcurvestmp += 2) {
167 if (tls_curve_allowed(s, pcurvestmp, SSL_SECOP_CURVE_SUPPORTED)) {
168 if (!WPACKET_put_bytes_u8(pkt, pcurvestmp[0])
169 || !WPACKET_put_bytes_u8(pkt, pcurvestmp[1])) {
170 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_GROUPS,
171 ERR_R_INTERNAL_ERROR);
176 if (!WPACKET_close(pkt) || !WPACKET_close(pkt)) {
177 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_GROUPS,
178 ERR_R_INTERNAL_ERROR);
186 int tls_construct_ctos_session_ticket(SSL *s, WPACKET *pkt,
187 unsigned int context, X509 *x,
188 size_t chainidx, int *al)
192 if (!tls_use_ticket(s))
195 if (!s->new_session && s->session != NULL
196 && s->session->ext.tick != NULL
197 && s->session->ssl_version != TLS1_3_VERSION) {
198 ticklen = s->session->ext.ticklen;
199 } else if (s->session && s->ext.session_ticket != NULL
200 && s->ext.session_ticket->data != NULL) {
201 ticklen = s->ext.session_ticket->length;
202 s->session->ext.tick = OPENSSL_malloc(ticklen);
203 if (s->session->ext.tick == NULL) {
204 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SESSION_TICKET,
205 ERR_R_INTERNAL_ERROR);
208 memcpy(s->session->ext.tick,
209 s->ext.session_ticket->data, ticklen);
210 s->session->ext.ticklen = ticklen;
215 if (ticklen == 0 && s->ext.session_ticket != NULL &&
216 s->ext.session_ticket->data == NULL)
219 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_session_ticket)
220 || !WPACKET_sub_memcpy_u16(pkt, s->session->ext.tick, ticklen)) {
221 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SESSION_TICKET, ERR_R_INTERNAL_ERROR);
228 int tls_construct_ctos_sig_algs(SSL *s, WPACKET *pkt, unsigned int context,
229 X509 *x, size_t chainidx, int *al)
232 const uint16_t *salg;
234 if (!SSL_CLIENT_USE_SIGALGS(s))
237 salglen = tls12_get_psigalgs(s, 1, &salg);
238 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_signature_algorithms)
239 /* Sub-packet for sig-algs extension */
240 || !WPACKET_start_sub_packet_u16(pkt)
241 /* Sub-packet for the actual list */
242 || !WPACKET_start_sub_packet_u16(pkt)
243 || !tls12_copy_sigalgs(s, pkt, salg, salglen)
244 || !WPACKET_close(pkt)
245 || !WPACKET_close(pkt)) {
246 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SIG_ALGS, ERR_R_INTERNAL_ERROR);
253 #ifndef OPENSSL_NO_OCSP
254 int tls_construct_ctos_status_request(SSL *s, WPACKET *pkt,
255 unsigned int context, X509 *x,
256 size_t chainidx, int *al)
260 /* This extension isn't defined for client Certificates */
264 if (s->ext.status_type != TLSEXT_STATUSTYPE_ocsp)
267 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_status_request)
268 /* Sub-packet for status request extension */
269 || !WPACKET_start_sub_packet_u16(pkt)
270 || !WPACKET_put_bytes_u8(pkt, TLSEXT_STATUSTYPE_ocsp)
271 /* Sub-packet for the ids */
272 || !WPACKET_start_sub_packet_u16(pkt)) {
273 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_STATUS_REQUEST, ERR_R_INTERNAL_ERROR);
276 for (i = 0; i < sk_OCSP_RESPID_num(s->ext.ocsp.ids); i++) {
277 unsigned char *idbytes;
278 OCSP_RESPID *id = sk_OCSP_RESPID_value(s->ext.ocsp.ids, i);
279 int idlen = i2d_OCSP_RESPID(id, NULL);
282 /* Sub-packet for an individual id */
283 || !WPACKET_sub_allocate_bytes_u16(pkt, idlen, &idbytes)
284 || i2d_OCSP_RESPID(id, &idbytes) != idlen) {
285 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_STATUS_REQUEST,
286 ERR_R_INTERNAL_ERROR);
290 if (!WPACKET_close(pkt)
291 || !WPACKET_start_sub_packet_u16(pkt)) {
292 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_STATUS_REQUEST, ERR_R_INTERNAL_ERROR);
295 if (s->ext.ocsp.exts) {
296 unsigned char *extbytes;
297 int extlen = i2d_X509_EXTENSIONS(s->ext.ocsp.exts, NULL);
300 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_STATUS_REQUEST,
301 ERR_R_INTERNAL_ERROR);
304 if (!WPACKET_allocate_bytes(pkt, extlen, &extbytes)
305 || i2d_X509_EXTENSIONS(s->ext.ocsp.exts, &extbytes)
307 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_STATUS_REQUEST,
308 ERR_R_INTERNAL_ERROR);
312 if (!WPACKET_close(pkt) || !WPACKET_close(pkt)) {
313 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_STATUS_REQUEST, ERR_R_INTERNAL_ERROR);
321 #ifndef OPENSSL_NO_NEXTPROTONEG
322 int tls_construct_ctos_npn(SSL *s, WPACKET *pkt, unsigned int context, X509 *x,
323 size_t chainidx, int *al)
325 if (s->ctx->ext.npn_select_cb == NULL || !SSL_IS_FIRST_HANDSHAKE(s))
329 * The client advertises an empty extension to indicate its support
330 * for Next Protocol Negotiation
332 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_next_proto_neg)
333 || !WPACKET_put_bytes_u16(pkt, 0)) {
334 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_NPN, ERR_R_INTERNAL_ERROR);
342 int tls_construct_ctos_alpn(SSL *s, WPACKET *pkt, unsigned int context, X509 *x,
343 size_t chainidx, int *al)
345 s->s3->alpn_sent = 0;
347 if (s->ext.alpn == NULL || !SSL_IS_FIRST_HANDSHAKE(s))
350 if (!WPACKET_put_bytes_u16(pkt,
351 TLSEXT_TYPE_application_layer_protocol_negotiation)
352 /* Sub-packet ALPN extension */
353 || !WPACKET_start_sub_packet_u16(pkt)
354 || !WPACKET_sub_memcpy_u16(pkt, s->ext.alpn, s->ext.alpn_len)
355 || !WPACKET_close(pkt)) {
356 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_ALPN, ERR_R_INTERNAL_ERROR);
359 s->s3->alpn_sent = 1;
365 #ifndef OPENSSL_NO_SRTP
366 int tls_construct_ctos_use_srtp(SSL *s, WPACKET *pkt, unsigned int context,
367 X509 *x, size_t chainidx, int *al)
369 STACK_OF(SRTP_PROTECTION_PROFILE) *clnt = SSL_get_srtp_profiles(s);
375 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_use_srtp)
376 /* Sub-packet for SRTP extension */
377 || !WPACKET_start_sub_packet_u16(pkt)
378 /* Sub-packet for the protection profile list */
379 || !WPACKET_start_sub_packet_u16(pkt)) {
380 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_USE_SRTP, ERR_R_INTERNAL_ERROR);
384 end = sk_SRTP_PROTECTION_PROFILE_num(clnt);
385 for (i = 0; i < end; i++) {
386 const SRTP_PROTECTION_PROFILE *prof =
387 sk_SRTP_PROTECTION_PROFILE_value(clnt, i);
389 if (prof == NULL || !WPACKET_put_bytes_u16(pkt, prof->id)) {
390 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_USE_SRTP, ERR_R_INTERNAL_ERROR);
394 if (!WPACKET_close(pkt)
395 /* Add an empty use_mki value */
396 || !WPACKET_put_bytes_u8(pkt, 0)
397 || !WPACKET_close(pkt)) {
398 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_USE_SRTP, ERR_R_INTERNAL_ERROR);
406 int tls_construct_ctos_etm(SSL *s, WPACKET *pkt, unsigned int context, X509 *x,
407 size_t chainidx, int *al)
409 if (s->options & SSL_OP_NO_ENCRYPT_THEN_MAC)
412 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_encrypt_then_mac)
413 || !WPACKET_put_bytes_u16(pkt, 0)) {
414 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_ETM, ERR_R_INTERNAL_ERROR);
421 #ifndef OPENSSL_NO_CT
422 int tls_construct_ctos_sct(SSL *s, WPACKET *pkt, unsigned int context, X509 *x,
423 size_t chainidx, int *al)
425 if (s->ct_validation_callback == NULL)
428 /* Not defined for client Certificates */
432 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_signed_certificate_timestamp)
433 || !WPACKET_put_bytes_u16(pkt, 0)) {
434 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SCT, ERR_R_INTERNAL_ERROR);
442 int tls_construct_ctos_ems(SSL *s, WPACKET *pkt, unsigned int context, X509 *x,
443 size_t chainidx, int *al)
445 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_extended_master_secret)
446 || !WPACKET_put_bytes_u16(pkt, 0)) {
447 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_EMS, ERR_R_INTERNAL_ERROR);
454 int tls_construct_ctos_supported_versions(SSL *s, WPACKET *pkt,
455 unsigned int context, X509 *x,
456 size_t chainidx, int *al)
458 int currv, min_version, max_version, reason;
460 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_supported_versions)
461 || !WPACKET_start_sub_packet_u16(pkt)
462 || !WPACKET_start_sub_packet_u8(pkt)) {
463 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_VERSIONS,
464 ERR_R_INTERNAL_ERROR);
468 reason = ssl_get_client_min_max_version(s, &min_version, &max_version);
470 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_VERSIONS, reason);
475 * TODO(TLS1.3): There is some discussion on the TLS list as to wheter
476 * we should include versions <TLS1.2. For the moment we do. To be
479 for (currv = max_version; currv >= min_version; currv--) {
480 /* TODO(TLS1.3): Remove this first if clause prior to release!! */
481 if (currv == TLS1_3_VERSION) {
482 if (!WPACKET_put_bytes_u16(pkt, TLS1_3_VERSION_DRAFT)) {
483 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_VERSIONS,
484 ERR_R_INTERNAL_ERROR);
487 } else if (!WPACKET_put_bytes_u16(pkt, currv)) {
488 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_VERSIONS,
489 ERR_R_INTERNAL_ERROR);
493 if (!WPACKET_close(pkt) || !WPACKET_close(pkt)) {
494 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_VERSIONS,
495 ERR_R_INTERNAL_ERROR);
503 * Construct a psk_kex_modes extension. We only have two modes we know about
504 * at this stage, so we send both.
506 int tls_construct_ctos_psk_kex_modes(SSL *s, WPACKET *pkt, unsigned int context,
507 X509 *x, size_t chainidx, int *al)
509 #ifndef OPENSSL_NO_TLS1_3
511 * TODO(TLS1.3): Do we want this list to be configurable? For now we always
512 * just send both supported modes
514 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_psk_kex_modes)
515 || !WPACKET_start_sub_packet_u16(pkt)
516 || !WPACKET_start_sub_packet_u8(pkt)
517 || !WPACKET_put_bytes_u8(pkt, TLSEXT_KEX_MODE_KE_DHE)
518 || !WPACKET_put_bytes_u8(pkt, TLSEXT_KEX_MODE_KE)
519 || !WPACKET_close(pkt)
520 || !WPACKET_close(pkt)) {
521 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_PSK_KEX_MODES, ERR_R_INTERNAL_ERROR);
525 s->ext.psk_kex_mode = TLSEXT_KEX_MODE_FLAG_KE | TLSEXT_KEX_MODE_FLAG_KE_DHE;
531 #ifndef OPENSSL_NO_TLS1_3
532 static int add_key_share(SSL *s, WPACKET *pkt, unsigned int curve_id)
534 unsigned char *encoded_point;
535 EVP_PKEY *key_share_key;
538 key_share_key = ssl_generate_pkey_curve(curve_id);
539 if (key_share_key == NULL) {
540 SSLerr(SSL_F_ADD_KEY_SHARE, ERR_R_EVP_LIB);
544 /* Encode the public key. */
545 encodedlen = EVP_PKEY_get1_tls_encodedpoint(key_share_key,
547 if (encodedlen == 0) {
548 SSLerr(SSL_F_ADD_KEY_SHARE, ERR_R_EC_LIB);
549 EVP_PKEY_free(key_share_key);
553 /* Create KeyShareEntry */
554 if (!WPACKET_put_bytes_u16(pkt, curve_id)
555 || !WPACKET_sub_memcpy_u16(pkt, encoded_point, encodedlen)) {
556 SSLerr(SSL_F_ADD_KEY_SHARE, ERR_R_INTERNAL_ERROR);
557 EVP_PKEY_free(key_share_key);
558 OPENSSL_free(encoded_point);
563 * TODO(TLS1.3): When changing to send more than one key_share we're
564 * going to need to be able to save more than one EVP_PKEY. For now
565 * we reuse the existing tmp.pkey
567 s->s3->tmp.pkey = key_share_key;
568 s->s3->group_id = curve_id;
569 OPENSSL_free(encoded_point);
575 int tls_construct_ctos_key_share(SSL *s, WPACKET *pkt, unsigned int context,
576 X509 *x, size_t chainidx, int *al)
578 #ifndef OPENSSL_NO_TLS1_3
579 size_t i, num_curves = 0;
580 const unsigned char *pcurves = NULL;
581 unsigned int curve_id = 0;
583 /* key_share extension */
584 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_key_share)
585 /* Extension data sub-packet */
586 || !WPACKET_start_sub_packet_u16(pkt)
587 /* KeyShare list sub-packet */
588 || !WPACKET_start_sub_packet_u16(pkt)) {
589 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_KEY_SHARE, ERR_R_INTERNAL_ERROR);
593 pcurves = s->ext.supportedgroups;
594 if (!tls1_get_curvelist(s, 0, &pcurves, &num_curves)) {
595 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_KEY_SHARE, ERR_R_INTERNAL_ERROR);
599 if (s->s3->tmp.pkey != NULL) {
600 /* Shouldn't happen! */
601 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_KEY_SHARE, ERR_R_INTERNAL_ERROR);
606 * TODO(TLS1.3): Make the number of key_shares sent configurable. For
609 if (s->s3->group_id != 0) {
610 curve_id = s->s3->group_id;
612 for (i = 0; i < num_curves; i++, pcurves += 2) {
614 if (!tls_curve_allowed(s, pcurves, SSL_SECOP_CURVE_SUPPORTED))
617 curve_id = bytestogroup(pcurves);
623 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_KEY_SHARE, SSL_R_NO_SUITABLE_KEY_SHARE);
627 if (!add_key_share(s, pkt, curve_id))
630 if (!WPACKET_close(pkt) || !WPACKET_close(pkt)) {
631 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_KEY_SHARE, ERR_R_INTERNAL_ERROR);
639 int tls_construct_ctos_early_data(SSL *s, WPACKET *pkt, unsigned int context,
640 X509 *x, size_t chainidx, int *al)
642 if (s->early_data_state != SSL_EARLY_DATA_CONNECTING
643 || s->session->ext.max_early_data == 0) {
644 s->max_early_data = 0;
647 s->max_early_data = s->session->ext.max_early_data;
649 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_early_data)
650 || !WPACKET_start_sub_packet_u16(pkt)
651 || !WPACKET_close(pkt)) {
652 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_EARLY_DATA, ERR_R_INTERNAL_ERROR);
657 * We set this to rejected here. Later, if the server acknowledges the
658 * extension, we set it to accepted.
660 s->ext.early_data = SSL_EARLY_DATA_REJECTED;
665 #define F5_WORKAROUND_MIN_MSG_LEN 0xff
666 #define F5_WORKAROUND_MAX_MSG_LEN 0x200
668 int tls_construct_ctos_padding(SSL *s, WPACKET *pkt, unsigned int context,
669 X509 *x, size_t chainidx, int *al)
671 unsigned char *padbytes;
674 if ((s->options & SSL_OP_TLSEXT_PADDING) == 0)
678 * Add padding to workaround bugs in F5 terminators. See
679 * https://tools.ietf.org/html/draft-agl-tls-padding-03 NB: because this
680 * code calculates the length of all existing extensions it MUST always
683 if (!WPACKET_get_total_written(pkt, &hlen)) {
684 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_PADDING, ERR_R_INTERNAL_ERROR);
688 if (hlen > F5_WORKAROUND_MIN_MSG_LEN && hlen < F5_WORKAROUND_MAX_MSG_LEN) {
689 /* Calculate the amond of padding we need to add */
690 hlen = F5_WORKAROUND_MAX_MSG_LEN - hlen;
693 * Take off the size of extension header itself (2 bytes for type and
694 * 2 bytes for length bytes)
701 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_padding)
702 || !WPACKET_sub_allocate_bytes_u16(pkt, hlen, &padbytes)) {
703 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_PADDING, ERR_R_INTERNAL_ERROR);
706 memset(padbytes, 0, hlen);
713 * Construct the pre_shared_key extension
715 int tls_construct_ctos_psk(SSL *s, WPACKET *pkt, unsigned int context, X509 *x,
716 size_t chainidx, int *al)
718 #ifndef OPENSSL_NO_TLS1_3
719 uint32_t now, agesec, agems;
720 size_t hashsize, binderoffset, msglen;
721 unsigned char *binder = NULL, *msgstart = NULL;
725 s->session->ext.tick_identity = TLSEXT_PSK_BAD_IDENTITY;
728 * If this is an incompatible or new session then we have nothing to resume
729 * so don't add this extension.
731 if (s->session->ssl_version != TLS1_3_VERSION
732 || s->session->ext.ticklen == 0)
735 if (s->session->cipher == NULL) {
736 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_PSK, ERR_R_INTERNAL_ERROR);
740 md = ssl_md(s->session->cipher->algorithm2);
742 /* Don't recognise this cipher so we can't use the session. Ignore it */
747 * Technically the C standard just says time() returns a time_t and says
748 * nothing about the encoding of that type. In practice most implementations
749 * follow POSIX which holds it as an integral type in seconds since epoch.
750 * We've already made the assumption that we can do this in multiple places
751 * in the code, so portability shouldn't be an issue.
753 now = (uint32_t)time(NULL);
754 agesec = now - (uint32_t)s->session->time;
756 if (s->session->ext.tick_lifetime_hint < agesec) {
757 /* Ticket is too old. Ignore it. */
762 * Calculate age in ms. We're just doing it to nearest second. Should be
765 agems = agesec * (uint32_t)1000;
767 if (agesec != 0 && agems / (uint32_t)1000 != agesec) {
769 * Overflow. Shouldn't happen unless this is a *really* old session. If
770 * so we just ignore it.
776 * Obfuscate the age. Overflow here is fine, this addition is supposed to
779 agems += s->session->ext.tick_age_add;
781 hashsize = EVP_MD_size(md);
783 /* Create the extension, but skip over the binder for now */
784 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_psk)
785 || !WPACKET_start_sub_packet_u16(pkt)
786 || !WPACKET_start_sub_packet_u16(pkt)
787 || !WPACKET_sub_memcpy_u16(pkt, s->session->ext.tick,
788 s->session->ext.ticklen)
789 || !WPACKET_put_bytes_u32(pkt, agems)
790 || !WPACKET_close(pkt)
791 || !WPACKET_get_total_written(pkt, &binderoffset)
792 || !WPACKET_start_sub_packet_u16(pkt)
793 || !WPACKET_sub_allocate_bytes_u8(pkt, hashsize, &binder)
794 || !WPACKET_close(pkt)
795 || !WPACKET_close(pkt)
796 || !WPACKET_get_total_written(pkt, &msglen)
798 * We need to fill in all the sub-packet lengths now so we can
799 * calculate the HMAC of the message up to the binders
801 || !WPACKET_fill_lengths(pkt)) {
802 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_PSK, ERR_R_INTERNAL_ERROR);
806 msgstart = WPACKET_get_curr(pkt) - msglen;
808 if (tls_psk_do_binder(s, md, msgstart, binderoffset, NULL, binder,
809 s->session, 1) != 1) {
810 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_PSK, ERR_R_INTERNAL_ERROR);
814 s->session->ext.tick_identity = 0;
825 * Parse the server's renegotiation binding and abort if it's not right
827 int tls_parse_stoc_renegotiate(SSL *s, PACKET *pkt, unsigned int context,
828 X509 *x, size_t chainidx, int *al)
830 size_t expected_len = s->s3->previous_client_finished_len
831 + s->s3->previous_server_finished_len;
833 const unsigned char *data;
835 /* Check for logic errors */
836 assert(expected_len == 0 || s->s3->previous_client_finished_len != 0);
837 assert(expected_len == 0 || s->s3->previous_server_finished_len != 0);
839 /* Parse the length byte */
840 if (!PACKET_get_1_len(pkt, &ilen)) {
841 SSLerr(SSL_F_TLS_PARSE_STOC_RENEGOTIATE,
842 SSL_R_RENEGOTIATION_ENCODING_ERR);
843 *al = SSL_AD_ILLEGAL_PARAMETER;
847 /* Consistency check */
848 if (PACKET_remaining(pkt) != ilen) {
849 SSLerr(SSL_F_TLS_PARSE_STOC_RENEGOTIATE,
850 SSL_R_RENEGOTIATION_ENCODING_ERR);
851 *al = SSL_AD_ILLEGAL_PARAMETER;
855 /* Check that the extension matches */
856 if (ilen != expected_len) {
857 SSLerr(SSL_F_TLS_PARSE_STOC_RENEGOTIATE,
858 SSL_R_RENEGOTIATION_MISMATCH);
859 *al = SSL_AD_HANDSHAKE_FAILURE;
863 if (!PACKET_get_bytes(pkt, &data, s->s3->previous_client_finished_len)
864 || memcmp(data, s->s3->previous_client_finished,
865 s->s3->previous_client_finished_len) != 0) {
866 SSLerr(SSL_F_TLS_PARSE_STOC_RENEGOTIATE,
867 SSL_R_RENEGOTIATION_MISMATCH);
868 *al = SSL_AD_HANDSHAKE_FAILURE;
872 if (!PACKET_get_bytes(pkt, &data, s->s3->previous_server_finished_len)
873 || memcmp(data, s->s3->previous_server_finished,
874 s->s3->previous_server_finished_len) != 0) {
875 SSLerr(SSL_F_TLS_PARSE_STOC_RENEGOTIATE,
876 SSL_R_RENEGOTIATION_MISMATCH);
877 *al = SSL_AD_ILLEGAL_PARAMETER;
880 s->s3->send_connection_binding = 1;
885 int tls_parse_stoc_server_name(SSL *s, PACKET *pkt, unsigned int context,
886 X509 *x, size_t chainidx, int *al)
888 if (s->ext.hostname == NULL || PACKET_remaining(pkt) > 0) {
889 *al = SSL_AD_UNRECOGNIZED_NAME;
894 if (s->session->ext.hostname != NULL) {
895 *al = SSL_AD_INTERNAL_ERROR;
898 s->session->ext.hostname = OPENSSL_strdup(s->ext.hostname);
899 if (s->session->ext.hostname == NULL) {
900 *al = SSL_AD_INTERNAL_ERROR;
908 int tls_parse_stoc_early_data_info(SSL *s, PACKET *pkt, unsigned int context,
909 X509 *x, size_t chainidx, int *al)
911 unsigned long max_early_data;
913 if (!PACKET_get_net_4(pkt, &max_early_data)
914 || PACKET_remaining(pkt) != 0) {
915 SSLerr(SSL_F_TLS_PARSE_STOC_EARLY_DATA_INFO,
916 SSL_R_INVALID_MAX_EARLY_DATA);
917 *al = SSL_AD_DECODE_ERROR;
921 s->session->ext.max_early_data = max_early_data;
926 #ifndef OPENSSL_NO_EC
927 int tls_parse_stoc_ec_pt_formats(SSL *s, PACKET *pkt, unsigned int context,
928 X509 *x, size_t chainidx, int *al)
930 unsigned int ecpointformats_len;
931 PACKET ecptformatlist;
933 if (!PACKET_as_length_prefixed_1(pkt, &ecptformatlist)) {
934 *al = SSL_AD_DECODE_ERROR;
938 ecpointformats_len = PACKET_remaining(&ecptformatlist);
939 s->session->ext.ecpointformats_len = 0;
941 OPENSSL_free(s->session->ext.ecpointformats);
942 s->session->ext.ecpointformats = OPENSSL_malloc(ecpointformats_len);
943 if (s->session->ext.ecpointformats == NULL) {
944 *al = SSL_AD_INTERNAL_ERROR;
948 s->session->ext.ecpointformats_len = ecpointformats_len;
950 if (!PACKET_copy_bytes(&ecptformatlist,
951 s->session->ext.ecpointformats,
952 ecpointformats_len)) {
953 *al = SSL_AD_INTERNAL_ERROR;
962 int tls_parse_stoc_session_ticket(SSL *s, PACKET *pkt, unsigned int context,
963 X509 *x, size_t chainidx, int *al)
965 if (s->ext.session_ticket_cb != NULL &&
966 !s->ext.session_ticket_cb(s, PACKET_data(pkt),
967 PACKET_remaining(pkt),
968 s->ext.session_ticket_cb_arg)) {
969 *al = SSL_AD_INTERNAL_ERROR;
973 if (!tls_use_ticket(s) || PACKET_remaining(pkt) > 0) {
974 *al = SSL_AD_UNSUPPORTED_EXTENSION;
978 s->ext.ticket_expected = 1;
983 #ifndef OPENSSL_NO_OCSP
984 int tls_parse_stoc_status_request(SSL *s, PACKET *pkt, unsigned int context,
985 X509 *x, size_t chainidx, int *al)
988 * MUST only be sent if we've requested a status
989 * request message. In TLS <= 1.2 it must also be empty.
991 if (s->ext.status_type == TLSEXT_STATUSTYPE_nothing
992 || (!SSL_IS_TLS13(s) && PACKET_remaining(pkt) > 0)) {
993 *al = SSL_AD_UNSUPPORTED_EXTENSION;
997 if (SSL_IS_TLS13(s)) {
998 /* We only know how to handle this if it's for the first Certificate in
999 * the chain. We ignore any other repsonses.
1003 return tls_process_cert_status_body(s, pkt, al);
1006 /* Set flag to expect CertificateStatus message */
1007 s->ext.status_expected = 1;
1014 #ifndef OPENSSL_NO_CT
1015 int tls_parse_stoc_sct(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
1016 size_t chainidx, int *al)
1019 * Only take it if we asked for it - i.e if there is no CT validation
1020 * callback set, then a custom extension MAY be processing it, so we
1021 * need to let control continue to flow to that.
1023 if (s->ct_validation_callback != NULL) {
1024 size_t size = PACKET_remaining(pkt);
1026 /* Simply copy it off for later processing */
1027 OPENSSL_free(s->ext.scts);
1030 s->ext.scts_len = size;
1032 s->ext.scts = OPENSSL_malloc(size);
1033 if (s->ext.scts == NULL
1034 || !PACKET_copy_bytes(pkt, s->ext.scts, size)) {
1035 *al = SSL_AD_INTERNAL_ERROR;
1040 if (custom_ext_parse(s, 0, TLSEXT_TYPE_signed_certificate_timestamp,
1041 PACKET_data(pkt), PACKET_remaining(pkt), al) <= 0)
1050 #ifndef OPENSSL_NO_NEXTPROTONEG
1052 * ssl_next_proto_validate validates a Next Protocol Negotiation block. No
1053 * elements of zero length are allowed and the set of elements must exactly
1054 * fill the length of the block. Returns 1 on success or 0 on failure.
1056 static int ssl_next_proto_validate(PACKET *pkt)
1058 PACKET tmp_protocol;
1060 while (PACKET_remaining(pkt)) {
1061 if (!PACKET_get_length_prefixed_1(pkt, &tmp_protocol)
1062 || PACKET_remaining(&tmp_protocol) == 0)
1069 int tls_parse_stoc_npn(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
1070 size_t chainidx, int *al)
1072 unsigned char *selected;
1073 unsigned char selected_len;
1076 /* Check if we are in a renegotiation. If so ignore this extension */
1077 if (!SSL_IS_FIRST_HANDSHAKE(s))
1080 /* We must have requested it. */
1081 if (s->ctx->ext.npn_select_cb == NULL) {
1082 *al = SSL_AD_UNSUPPORTED_EXTENSION;
1086 /* The data must be valid */
1088 if (!ssl_next_proto_validate(&tmppkt)) {
1089 *al = SSL_AD_DECODE_ERROR;
1092 if (s->ctx->ext.npn_select_cb(s, &selected, &selected_len,
1094 PACKET_remaining(pkt),
1095 s->ctx->ext.npn_select_cb_arg) !=
1096 SSL_TLSEXT_ERR_OK) {
1097 *al = SSL_AD_INTERNAL_ERROR;
1102 * Could be non-NULL if server has sent multiple NPN extensions in
1103 * a single Serverhello
1105 OPENSSL_free(s->ext.npn);
1106 s->ext.npn = OPENSSL_malloc(selected_len);
1107 if (s->ext.npn == NULL) {
1108 *al = SSL_AD_INTERNAL_ERROR;
1112 memcpy(s->ext.npn, selected, selected_len);
1113 s->ext.npn_len = selected_len;
1114 s->s3->npn_seen = 1;
1120 int tls_parse_stoc_alpn(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
1121 size_t chainidx, int *al)
1125 /* We must have requested it. */
1126 if (!s->s3->alpn_sent) {
1127 *al = SSL_AD_UNSUPPORTED_EXTENSION;
1131 * The extension data consists of:
1132 * uint16 list_length
1133 * uint8 proto_length;
1134 * uint8 proto[proto_length];
1136 if (!PACKET_get_net_2_len(pkt, &len)
1137 || PACKET_remaining(pkt) != len || !PACKET_get_1_len(pkt, &len)
1138 || PACKET_remaining(pkt) != len) {
1139 *al = SSL_AD_DECODE_ERROR;
1142 OPENSSL_free(s->s3->alpn_selected);
1143 s->s3->alpn_selected = OPENSSL_malloc(len);
1144 if (s->s3->alpn_selected == NULL) {
1145 *al = SSL_AD_INTERNAL_ERROR;
1148 if (!PACKET_copy_bytes(pkt, s->s3->alpn_selected, len)) {
1149 *al = SSL_AD_DECODE_ERROR;
1152 s->s3->alpn_selected_len = len;
1157 #ifndef OPENSSL_NO_SRTP
1158 int tls_parse_stoc_use_srtp(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
1159 size_t chainidx, int *al)
1161 unsigned int id, ct, mki;
1163 STACK_OF(SRTP_PROTECTION_PROFILE) *clnt;
1164 SRTP_PROTECTION_PROFILE *prof;
1166 if (!PACKET_get_net_2(pkt, &ct) || ct != 2
1167 || !PACKET_get_net_2(pkt, &id)
1168 || !PACKET_get_1(pkt, &mki)
1169 || PACKET_remaining(pkt) != 0) {
1170 SSLerr(SSL_F_TLS_PARSE_STOC_USE_SRTP,
1171 SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST);
1172 *al = SSL_AD_DECODE_ERROR;
1177 /* Must be no MKI, since we never offer one */
1178 SSLerr(SSL_F_TLS_PARSE_STOC_USE_SRTP, SSL_R_BAD_SRTP_MKI_VALUE);
1179 *al = SSL_AD_ILLEGAL_PARAMETER;
1183 /* Throw an error if the server gave us an unsolicited extension */
1184 clnt = SSL_get_srtp_profiles(s);
1186 SSLerr(SSL_F_TLS_PARSE_STOC_USE_SRTP, SSL_R_NO_SRTP_PROFILES);
1187 *al = SSL_AD_DECODE_ERROR;
1192 * Check to see if the server gave us something we support (and
1193 * presumably offered)
1195 for (i = 0; i < sk_SRTP_PROTECTION_PROFILE_num(clnt); i++) {
1196 prof = sk_SRTP_PROTECTION_PROFILE_value(clnt, i);
1198 if (prof->id == id) {
1199 s->srtp_profile = prof;
1205 SSLerr(SSL_F_TLS_PARSE_STOC_USE_SRTP,
1206 SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST);
1207 *al = SSL_AD_DECODE_ERROR;
1212 int tls_parse_stoc_etm(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
1213 size_t chainidx, int *al)
1215 /* Ignore if inappropriate ciphersuite */
1216 if (!(s->options & SSL_OP_NO_ENCRYPT_THEN_MAC)
1217 && s->s3->tmp.new_cipher->algorithm_mac != SSL_AEAD
1218 && s->s3->tmp.new_cipher->algorithm_enc != SSL_RC4)
1224 int tls_parse_stoc_ems(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
1225 size_t chainidx, int *al)
1227 s->s3->flags |= TLS1_FLAGS_RECEIVED_EXTMS;
1229 s->session->flags |= SSL_SESS_FLAG_EXTMS;
1234 int tls_parse_stoc_key_share(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
1235 size_t chainidx, int *al)
1237 #ifndef OPENSSL_NO_TLS1_3
1238 unsigned int group_id;
1240 EVP_PKEY *ckey = s->s3->tmp.pkey, *skey = NULL;
1244 *al = SSL_AD_INTERNAL_ERROR;
1245 SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE, ERR_R_INTERNAL_ERROR);
1249 if (!PACKET_get_net_2(pkt, &group_id)) {
1250 *al = SSL_AD_HANDSHAKE_FAILURE;
1251 SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE, SSL_R_LENGTH_MISMATCH);
1255 if ((context & EXT_TLS1_3_HELLO_RETRY_REQUEST) != 0) {
1256 unsigned const char *pcurves = NULL;
1257 size_t i, num_curves;
1259 if (PACKET_remaining(pkt) != 0) {
1260 *al = SSL_AD_HANDSHAKE_FAILURE;
1261 SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE, SSL_R_LENGTH_MISMATCH);
1266 * It is an error if the HelloRetryRequest wants a key_share that we
1267 * already sent in the first ClientHello
1269 if (group_id == s->s3->group_id) {
1270 *al = SSL_AD_ILLEGAL_PARAMETER;
1271 SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE, SSL_R_BAD_KEY_SHARE);
1275 /* Validate the selected group is one we support */
1276 pcurves = s->ext.supportedgroups;
1277 if (!tls1_get_curvelist(s, 0, &pcurves, &num_curves)) {
1278 SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE, ERR_R_INTERNAL_ERROR);
1281 for (i = 0; i < num_curves; i++, pcurves += 2) {
1282 if (group_id == bytestogroup(pcurves))
1286 || !tls_curve_allowed(s, pcurves, SSL_SECOP_CURVE_SUPPORTED)) {
1287 *al = SSL_AD_ILLEGAL_PARAMETER;
1288 SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE, SSL_R_BAD_KEY_SHARE);
1292 s->s3->group_id = group_id;
1293 EVP_PKEY_free(s->s3->tmp.pkey);
1294 s->s3->tmp.pkey = NULL;
1298 if (group_id != s->s3->group_id) {
1300 * This isn't for the group that we sent in the original
1303 *al = SSL_AD_HANDSHAKE_FAILURE;
1304 SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE, SSL_R_BAD_KEY_SHARE);
1308 if (!PACKET_as_length_prefixed_2(pkt, &encoded_pt)
1309 || PACKET_remaining(&encoded_pt) == 0) {
1310 *al = SSL_AD_DECODE_ERROR;
1311 SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE, SSL_R_LENGTH_MISMATCH);
1315 skey = ssl_generate_pkey(ckey);
1317 *al = SSL_AD_INTERNAL_ERROR;
1318 SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE, ERR_R_MALLOC_FAILURE);
1321 if (!EVP_PKEY_set1_tls_encodedpoint(skey, PACKET_data(&encoded_pt),
1322 PACKET_remaining(&encoded_pt))) {
1323 *al = SSL_AD_DECODE_ERROR;
1324 SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE, SSL_R_BAD_ECPOINT);
1325 EVP_PKEY_free(skey);
1329 if (ssl_derive(s, ckey, skey, 1) == 0) {
1330 *al = SSL_AD_INTERNAL_ERROR;
1331 SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE, ERR_R_INTERNAL_ERROR);
1332 EVP_PKEY_free(skey);
1335 EVP_PKEY_free(skey);
1341 int tls_parse_stoc_early_data(SSL *s, PACKET *pkt, unsigned int context,
1342 X509 *x, size_t chainidx, int *al)
1344 if (PACKET_remaining(pkt) != 0) {
1345 *al = SSL_AD_DECODE_ERROR;
1349 if (s->ext.early_data != SSL_EARLY_DATA_REJECTED
1351 || s->session->ext.tick_identity != 0) {
1353 * If we get here then we didn't send early data, or we didn't resume
1354 * using the first identity so the server should not be accepting it.
1356 *al = SSL_AD_ILLEGAL_PARAMETER;
1360 s->ext.early_data = SSL_EARLY_DATA_ACCEPTED;
1365 int tls_parse_stoc_psk(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
1366 size_t chainidx, int *al)
1368 #ifndef OPENSSL_NO_TLS1_3
1369 unsigned int identity;
1371 if (!PACKET_get_net_2(pkt, &identity) || PACKET_remaining(pkt) != 0) {
1372 *al = SSL_AD_HANDSHAKE_FAILURE;
1373 SSLerr(SSL_F_TLS_PARSE_STOC_PSK, SSL_R_LENGTH_MISMATCH);
1377 if (s->session->ext.tick_identity != (int)identity) {
1378 *al = SSL_AD_HANDSHAKE_FAILURE;
1379 SSLerr(SSL_F_TLS_PARSE_STOC_PSK, SSL_R_BAD_PSK_IDENTITY);