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 #ifndef OPENSSL_NO_SRP
61 EXT_RETURN tls_construct_ctos_srp(SSL *s, WPACKET *pkt, unsigned int context,
62 X509 *x, size_t chainidx, int *al)
64 /* Add SRP username if there is one */
65 if (s->srp_ctx.login == NULL)
66 return EXT_RETURN_NOT_SENT;
68 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_srp)
69 /* Sub-packet for SRP extension */
70 || !WPACKET_start_sub_packet_u16(pkt)
71 || !WPACKET_start_sub_packet_u8(pkt)
72 /* login must not be zero...internal error if so */
73 || !WPACKET_set_flags(pkt, WPACKET_FLAGS_NON_ZERO_LENGTH)
74 || !WPACKET_memcpy(pkt, s->srp_ctx.login,
75 strlen(s->srp_ctx.login))
76 || !WPACKET_close(pkt)
77 || !WPACKET_close(pkt)) {
78 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SRP, ERR_R_INTERNAL_ERROR);
79 return EXT_RETURN_FAIL;
82 return EXT_RETURN_SENT;
87 static int use_ecc(SSL *s)
90 unsigned long alg_k, alg_a;
91 STACK_OF(SSL_CIPHER) *cipher_stack = NULL;
93 /* See if we support any ECC ciphersuites */
94 if (s->version == SSL3_VERSION)
97 cipher_stack = SSL_get_ciphers(s);
98 end = sk_SSL_CIPHER_num(cipher_stack);
99 for (i = 0; i < end; i++) {
100 const SSL_CIPHER *c = sk_SSL_CIPHER_value(cipher_stack, i);
102 alg_k = c->algorithm_mkey;
103 alg_a = c->algorithm_auth;
104 if ((alg_k & (SSL_kECDHE | SSL_kECDHEPSK))
105 || (alg_a & SSL_aECDSA)
106 || c->min_tls >= TLS1_3_VERSION)
113 EXT_RETURN tls_construct_ctos_ec_pt_formats(SSL *s, WPACKET *pkt,
114 unsigned int context, X509 *x,
115 size_t chainidx, int *al)
117 const unsigned char *pformats;
121 return EXT_RETURN_NOT_SENT;
123 /* Add TLS extension ECPointFormats to the ClientHello message */
124 tls1_get_formatlist(s, &pformats, &num_formats);
126 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_ec_point_formats)
127 /* Sub-packet for formats extension */
128 || !WPACKET_start_sub_packet_u16(pkt)
129 || !WPACKET_sub_memcpy_u8(pkt, pformats, num_formats)
130 || !WPACKET_close(pkt)) {
131 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_EC_PT_FORMATS, ERR_R_INTERNAL_ERROR);
132 return EXT_RETURN_FAIL;
135 return EXT_RETURN_SENT;
138 EXT_RETURN tls_construct_ctos_supported_groups(SSL *s, WPACKET *pkt,
139 unsigned int context, X509 *x,
140 size_t chainidx, int *al)
142 const unsigned char *pcurves = NULL, *pcurvestmp;
143 size_t num_curves = 0, i;
146 return EXT_RETURN_NOT_SENT;
149 * Add TLS extension supported_groups to the ClientHello message
151 /* TODO(TLS1.3): Add support for DHE groups */
152 if (!tls1_get_curvelist(s, 0, &pcurves, &num_curves)) {
153 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_GROUPS,
154 ERR_R_INTERNAL_ERROR);
155 return EXT_RETURN_FAIL;
157 pcurvestmp = pcurves;
159 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_supported_groups)
160 /* Sub-packet for supported_groups extension */
161 || !WPACKET_start_sub_packet_u16(pkt)
162 || !WPACKET_start_sub_packet_u16(pkt)) {
163 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_GROUPS,
164 ERR_R_INTERNAL_ERROR);
165 return EXT_RETURN_FAIL;
167 /* Copy curve ID if supported */
168 for (i = 0; i < num_curves; i++, pcurvestmp += 2) {
169 if (tls_curve_allowed(s, pcurvestmp, SSL_SECOP_CURVE_SUPPORTED)) {
170 if (!WPACKET_put_bytes_u8(pkt, pcurvestmp[0])
171 || !WPACKET_put_bytes_u8(pkt, pcurvestmp[1])) {
172 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_GROUPS,
173 ERR_R_INTERNAL_ERROR);
174 return EXT_RETURN_FAIL;
178 if (!WPACKET_close(pkt) || !WPACKET_close(pkt)) {
179 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_GROUPS,
180 ERR_R_INTERNAL_ERROR);
181 return EXT_RETURN_FAIL;
184 return EXT_RETURN_SENT;
188 EXT_RETURN tls_construct_ctos_session_ticket(SSL *s, WPACKET *pkt,
189 unsigned int context, X509 *x,
190 size_t chainidx, int *al)
194 if (!tls_use_ticket(s))
195 return EXT_RETURN_NOT_SENT;
197 if (!s->new_session && s->session != NULL
198 && s->session->ext.tick != NULL
199 && s->session->ssl_version != TLS1_3_VERSION) {
200 ticklen = s->session->ext.ticklen;
201 } else if (s->session && s->ext.session_ticket != NULL
202 && s->ext.session_ticket->data != NULL) {
203 ticklen = s->ext.session_ticket->length;
204 s->session->ext.tick = OPENSSL_malloc(ticklen);
205 if (s->session->ext.tick == NULL) {
206 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SESSION_TICKET,
207 ERR_R_INTERNAL_ERROR);
208 return EXT_RETURN_FAIL;
210 memcpy(s->session->ext.tick,
211 s->ext.session_ticket->data, ticklen);
212 s->session->ext.ticklen = ticklen;
217 if (ticklen == 0 && s->ext.session_ticket != NULL &&
218 s->ext.session_ticket->data == NULL)
219 return EXT_RETURN_NOT_SENT;
221 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_session_ticket)
222 || !WPACKET_sub_memcpy_u16(pkt, s->session->ext.tick, ticklen)) {
223 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SESSION_TICKET, ERR_R_INTERNAL_ERROR);
224 return EXT_RETURN_FAIL;
227 return EXT_RETURN_SENT;
230 EXT_RETURN tls_construct_ctos_sig_algs(SSL *s, WPACKET *pkt,
231 unsigned int context, X509 *x,
232 size_t chainidx, int *al)
235 const uint16_t *salg;
237 if (!SSL_CLIENT_USE_SIGALGS(s))
238 return EXT_RETURN_NOT_SENT;
240 salglen = tls12_get_psigalgs(s, 1, &salg);
241 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_signature_algorithms)
242 /* Sub-packet for sig-algs extension */
243 || !WPACKET_start_sub_packet_u16(pkt)
244 /* Sub-packet for the actual list */
245 || !WPACKET_start_sub_packet_u16(pkt)
246 || !tls12_copy_sigalgs(s, pkt, salg, salglen)
247 || !WPACKET_close(pkt)
248 || !WPACKET_close(pkt)) {
249 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SIG_ALGS, ERR_R_INTERNAL_ERROR);
250 return EXT_RETURN_FAIL;
253 return EXT_RETURN_SENT;
256 #ifndef OPENSSL_NO_OCSP
257 EXT_RETURN tls_construct_ctos_status_request(SSL *s, WPACKET *pkt,
258 unsigned int context, X509 *x,
259 size_t chainidx, int *al)
263 /* This extension isn't defined for client Certificates */
265 return EXT_RETURN_NOT_SENT;
267 if (s->ext.status_type != TLSEXT_STATUSTYPE_ocsp)
268 return EXT_RETURN_NOT_SENT;
270 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_status_request)
271 /* Sub-packet for status request extension */
272 || !WPACKET_start_sub_packet_u16(pkt)
273 || !WPACKET_put_bytes_u8(pkt, TLSEXT_STATUSTYPE_ocsp)
274 /* Sub-packet for the ids */
275 || !WPACKET_start_sub_packet_u16(pkt)) {
276 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_STATUS_REQUEST, ERR_R_INTERNAL_ERROR);
277 return EXT_RETURN_FAIL;
279 for (i = 0; i < sk_OCSP_RESPID_num(s->ext.ocsp.ids); i++) {
280 unsigned char *idbytes;
281 OCSP_RESPID *id = sk_OCSP_RESPID_value(s->ext.ocsp.ids, i);
282 int idlen = i2d_OCSP_RESPID(id, NULL);
285 /* Sub-packet for an individual id */
286 || !WPACKET_sub_allocate_bytes_u16(pkt, idlen, &idbytes)
287 || i2d_OCSP_RESPID(id, &idbytes) != idlen) {
288 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_STATUS_REQUEST,
289 ERR_R_INTERNAL_ERROR);
290 return EXT_RETURN_FAIL;
293 if (!WPACKET_close(pkt)
294 || !WPACKET_start_sub_packet_u16(pkt)) {
295 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_STATUS_REQUEST, ERR_R_INTERNAL_ERROR);
296 return EXT_RETURN_FAIL;
298 if (s->ext.ocsp.exts) {
299 unsigned char *extbytes;
300 int extlen = i2d_X509_EXTENSIONS(s->ext.ocsp.exts, NULL);
303 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_STATUS_REQUEST,
304 ERR_R_INTERNAL_ERROR);
305 return EXT_RETURN_FAIL;
307 if (!WPACKET_allocate_bytes(pkt, extlen, &extbytes)
308 || i2d_X509_EXTENSIONS(s->ext.ocsp.exts, &extbytes)
310 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_STATUS_REQUEST,
311 ERR_R_INTERNAL_ERROR);
312 return EXT_RETURN_FAIL;
315 if (!WPACKET_close(pkt) || !WPACKET_close(pkt)) {
316 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_STATUS_REQUEST, ERR_R_INTERNAL_ERROR);
317 return EXT_RETURN_FAIL;
320 return EXT_RETURN_SENT;
324 #ifndef OPENSSL_NO_NEXTPROTONEG
325 EXT_RETURN tls_construct_ctos_npn(SSL *s, WPACKET *pkt, unsigned int context,
326 X509 *x, size_t chainidx, int *al)
328 if (s->ctx->ext.npn_select_cb == NULL || !SSL_IS_FIRST_HANDSHAKE(s))
329 return EXT_RETURN_NOT_SENT;
332 * The client advertises an empty extension to indicate its support
333 * for Next Protocol Negotiation
335 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_next_proto_neg)
336 || !WPACKET_put_bytes_u16(pkt, 0)) {
337 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_NPN, ERR_R_INTERNAL_ERROR);
338 return EXT_RETURN_FAIL;
341 return EXT_RETURN_SENT;
345 EXT_RETURN tls_construct_ctos_alpn(SSL *s, WPACKET *pkt, unsigned int context,
346 X509 *x, size_t chainidx, int *al)
348 s->s3->alpn_sent = 0;
350 if (s->ext.alpn == NULL || !SSL_IS_FIRST_HANDSHAKE(s))
351 return EXT_RETURN_NOT_SENT;
353 if (!WPACKET_put_bytes_u16(pkt,
354 TLSEXT_TYPE_application_layer_protocol_negotiation)
355 /* Sub-packet ALPN extension */
356 || !WPACKET_start_sub_packet_u16(pkt)
357 || !WPACKET_sub_memcpy_u16(pkt, s->ext.alpn, s->ext.alpn_len)
358 || !WPACKET_close(pkt)) {
359 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_ALPN, ERR_R_INTERNAL_ERROR);
360 return EXT_RETURN_FAIL;
362 s->s3->alpn_sent = 1;
364 return EXT_RETURN_SENT;
368 #ifndef OPENSSL_NO_SRTP
369 EXT_RETURN tls_construct_ctos_use_srtp(SSL *s, WPACKET *pkt,
370 unsigned int context, X509 *x,
371 size_t chainidx, int *al)
373 STACK_OF(SRTP_PROTECTION_PROFILE) *clnt = SSL_get_srtp_profiles(s);
377 return EXT_RETURN_NOT_SENT;
379 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_use_srtp)
380 /* Sub-packet for SRTP extension */
381 || !WPACKET_start_sub_packet_u16(pkt)
382 /* Sub-packet for the protection profile list */
383 || !WPACKET_start_sub_packet_u16(pkt)) {
384 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_USE_SRTP, ERR_R_INTERNAL_ERROR);
385 return EXT_RETURN_FAIL;
388 end = sk_SRTP_PROTECTION_PROFILE_num(clnt);
389 for (i = 0; i < end; i++) {
390 const SRTP_PROTECTION_PROFILE *prof =
391 sk_SRTP_PROTECTION_PROFILE_value(clnt, i);
393 if (prof == NULL || !WPACKET_put_bytes_u16(pkt, prof->id)) {
394 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_USE_SRTP, ERR_R_INTERNAL_ERROR);
395 return EXT_RETURN_FAIL;
398 if (!WPACKET_close(pkt)
399 /* Add an empty use_mki value */
400 || !WPACKET_put_bytes_u8(pkt, 0)
401 || !WPACKET_close(pkt)) {
402 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_USE_SRTP, ERR_R_INTERNAL_ERROR);
403 return EXT_RETURN_FAIL;
406 return EXT_RETURN_SENT;
410 EXT_RETURN tls_construct_ctos_etm(SSL *s, WPACKET *pkt, unsigned int context,
411 X509 *x, size_t chainidx, int *al)
413 if (s->options & SSL_OP_NO_ENCRYPT_THEN_MAC)
414 return EXT_RETURN_NOT_SENT;
416 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_encrypt_then_mac)
417 || !WPACKET_put_bytes_u16(pkt, 0)) {
418 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_ETM, ERR_R_INTERNAL_ERROR);
419 return EXT_RETURN_FAIL;
422 return EXT_RETURN_SENT;
425 #ifndef OPENSSL_NO_CT
426 EXT_RETURN tls_construct_ctos_sct(SSL *s, WPACKET *pkt, unsigned int context,
427 X509 *x, size_t chainidx, int *al)
429 if (s->ct_validation_callback == NULL)
430 return EXT_RETURN_NOT_SENT;
432 /* Not defined for client Certificates */
434 return EXT_RETURN_NOT_SENT;
436 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_signed_certificate_timestamp)
437 || !WPACKET_put_bytes_u16(pkt, 0)) {
438 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SCT, ERR_R_INTERNAL_ERROR);
439 return EXT_RETURN_FAIL;
442 return EXT_RETURN_SENT;
446 EXT_RETURN tls_construct_ctos_ems(SSL *s, WPACKET *pkt, unsigned int context,
447 X509 *x, size_t chainidx, int *al)
449 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_extended_master_secret)
450 || !WPACKET_put_bytes_u16(pkt, 0)) {
451 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_EMS, ERR_R_INTERNAL_ERROR);
452 return EXT_RETURN_FAIL;
455 return EXT_RETURN_SENT;
458 EXT_RETURN tls_construct_ctos_supported_versions(SSL *s, WPACKET *pkt,
459 unsigned int context, X509 *x,
460 size_t chainidx, int *al)
462 int currv, min_version, max_version, reason;
464 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_supported_versions)
465 || !WPACKET_start_sub_packet_u16(pkt)
466 || !WPACKET_start_sub_packet_u8(pkt)) {
467 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_VERSIONS,
468 ERR_R_INTERNAL_ERROR);
469 return EXT_RETURN_FAIL;
472 reason = ssl_get_min_max_version(s, &min_version, &max_version);
474 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_VERSIONS, reason);
475 return EXT_RETURN_FAIL;
479 * TODO(TLS1.3): There is some discussion on the TLS list as to whether
480 * we should include versions <TLS1.2. For the moment we do. To be
483 for (currv = max_version; currv >= min_version; currv--) {
484 /* TODO(TLS1.3): Remove this first if clause prior to release!! */
485 if (currv == TLS1_3_VERSION) {
486 if (!WPACKET_put_bytes_u16(pkt, TLS1_3_VERSION_DRAFT)) {
487 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_VERSIONS,
488 ERR_R_INTERNAL_ERROR);
489 return EXT_RETURN_FAIL;
491 } else if (!WPACKET_put_bytes_u16(pkt, currv)) {
492 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_VERSIONS,
493 ERR_R_INTERNAL_ERROR);
494 return EXT_RETURN_FAIL;
497 if (!WPACKET_close(pkt) || !WPACKET_close(pkt)) {
498 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_VERSIONS,
499 ERR_R_INTERNAL_ERROR);
500 return EXT_RETURN_FAIL;
503 return EXT_RETURN_SENT;
507 * Construct a psk_kex_modes extension.
509 EXT_RETURN tls_construct_ctos_psk_kex_modes(SSL *s, WPACKET *pkt,
510 unsigned int context, X509 *x,
511 size_t chainidx, int *al)
513 #ifndef OPENSSL_NO_TLS1_3
514 int nodhe = s->options & SSL_OP_ALLOW_NO_DHE_KEX;
516 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_psk_kex_modes)
517 || !WPACKET_start_sub_packet_u16(pkt)
518 || !WPACKET_start_sub_packet_u8(pkt)
519 || !WPACKET_put_bytes_u8(pkt, TLSEXT_KEX_MODE_KE_DHE)
520 || (nodhe && !WPACKET_put_bytes_u8(pkt, TLSEXT_KEX_MODE_KE))
521 || !WPACKET_close(pkt)
522 || !WPACKET_close(pkt)) {
523 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_PSK_KEX_MODES, ERR_R_INTERNAL_ERROR);
524 return EXT_RETURN_FAIL;
527 s->ext.psk_kex_mode = TLSEXT_KEX_MODE_FLAG_KE_DHE;
529 s->ext.psk_kex_mode |= TLSEXT_KEX_MODE_FLAG_KE;
532 return EXT_RETURN_SENT;
535 #ifndef OPENSSL_NO_TLS1_3
536 static int add_key_share(SSL *s, WPACKET *pkt, unsigned int curve_id)
538 unsigned char *encoded_point = NULL;
539 EVP_PKEY *key_share_key = NULL;
542 if (s->s3->tmp.pkey != NULL) {
543 if (!ossl_assert(s->hello_retry_request)) {
544 SSLerr(SSL_F_ADD_KEY_SHARE, ERR_R_INTERNAL_ERROR);
548 * Could happen if we got an HRR that wasn't requesting a new key_share
550 key_share_key = s->s3->tmp.pkey;
552 key_share_key = ssl_generate_pkey_curve(curve_id);
553 if (key_share_key == NULL) {
554 SSLerr(SSL_F_ADD_KEY_SHARE, ERR_R_EVP_LIB);
559 /* Encode the public key. */
560 encodedlen = EVP_PKEY_get1_tls_encodedpoint(key_share_key,
562 if (encodedlen == 0) {
563 SSLerr(SSL_F_ADD_KEY_SHARE, ERR_R_EC_LIB);
567 /* Create KeyShareEntry */
568 if (!WPACKET_put_bytes_u16(pkt, curve_id)
569 || !WPACKET_sub_memcpy_u16(pkt, encoded_point, encodedlen)) {
570 SSLerr(SSL_F_ADD_KEY_SHARE, ERR_R_INTERNAL_ERROR);
575 * TODO(TLS1.3): When changing to send more than one key_share we're
576 * going to need to be able to save more than one EVP_PKEY. For now
577 * we reuse the existing tmp.pkey
579 s->s3->tmp.pkey = key_share_key;
580 s->s3->group_id = curve_id;
581 OPENSSL_free(encoded_point);
585 if (s->s3->tmp.pkey == NULL)
586 EVP_PKEY_free(key_share_key);
587 OPENSSL_free(encoded_point);
592 EXT_RETURN tls_construct_ctos_key_share(SSL *s, WPACKET *pkt,
593 unsigned int context, X509 *x,
594 size_t chainidx, int *al)
596 #ifndef OPENSSL_NO_TLS1_3
597 size_t i, num_curves = 0;
598 const unsigned char *pcurves = NULL;
599 unsigned int curve_id = 0;
601 /* key_share extension */
602 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_key_share)
603 /* Extension data sub-packet */
604 || !WPACKET_start_sub_packet_u16(pkt)
605 /* KeyShare list sub-packet */
606 || !WPACKET_start_sub_packet_u16(pkt)) {
607 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_KEY_SHARE, ERR_R_INTERNAL_ERROR);
608 return EXT_RETURN_FAIL;
611 if (!tls1_get_curvelist(s, 0, &pcurves, &num_curves)) {
612 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_KEY_SHARE, ERR_R_INTERNAL_ERROR);
613 return EXT_RETURN_FAIL;
617 * TODO(TLS1.3): Make the number of key_shares sent configurable. For
620 if (s->s3->group_id != 0) {
621 curve_id = s->s3->group_id;
623 for (i = 0; i < num_curves; i++, pcurves += 2) {
625 if (!tls_curve_allowed(s, pcurves, SSL_SECOP_CURVE_SUPPORTED))
628 curve_id = bytestogroup(pcurves);
634 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_KEY_SHARE, SSL_R_NO_SUITABLE_KEY_SHARE);
635 return EXT_RETURN_FAIL;
638 if (!add_key_share(s, pkt, curve_id))
639 return EXT_RETURN_FAIL;
641 if (!WPACKET_close(pkt) || !WPACKET_close(pkt)) {
642 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_KEY_SHARE, ERR_R_INTERNAL_ERROR);
643 return EXT_RETURN_FAIL;
647 return EXT_RETURN_SENT;
650 EXT_RETURN tls_construct_ctos_cookie(SSL *s, WPACKET *pkt, unsigned int context,
651 X509 *x, size_t chainidx, int *al)
653 EXT_RETURN ret = EXT_RETURN_FAIL;
655 /* Should only be set if we've had an HRR */
656 if (s->ext.tls13_cookie_len == 0)
657 return EXT_RETURN_NOT_SENT;
659 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_cookie)
660 /* Extension data sub-packet */
661 || !WPACKET_start_sub_packet_u16(pkt)
662 || !WPACKET_sub_memcpy_u16(pkt, s->ext.tls13_cookie,
663 s->ext.tls13_cookie_len)
664 || !WPACKET_close(pkt)) {
665 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_COOKIE, ERR_R_INTERNAL_ERROR);
669 ret = EXT_RETURN_SENT;
671 OPENSSL_free(s->ext.tls13_cookie);
672 s->ext.tls13_cookie = NULL;
673 s->ext.tls13_cookie_len = 0;
678 EXT_RETURN tls_construct_ctos_early_data(SSL *s, WPACKET *pkt,
679 unsigned int context, X509 *x,
680 size_t chainidx, int *al)
682 const unsigned char *id;
684 SSL_SESSION *psksess = NULL;
685 SSL_SESSION *edsess = NULL;
686 const EVP_MD *handmd = NULL;
688 if (s->hello_retry_request)
689 handmd = ssl_handshake_md(s);
691 if (s->psk_use_session_cb != NULL
692 && (!s->psk_use_session_cb(s, handmd, &id, &idlen, &psksess)
694 && psksess->ssl_version != TLS1_3_VERSION))) {
695 SSL_SESSION_free(psksess);
696 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_EARLY_DATA, SSL_R_BAD_PSK);
697 return EXT_RETURN_FAIL;
700 SSL_SESSION_free(s->psksession);
701 s->psksession = psksess;
702 if (psksess != NULL) {
703 OPENSSL_free(s->psksession_id);
704 s->psksession_id = OPENSSL_memdup(id, idlen);
705 if (s->psksession_id == NULL) {
706 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_EARLY_DATA, ERR_R_INTERNAL_ERROR);
707 return EXT_RETURN_FAIL;
709 s->psksession_id_len = idlen;
712 if (s->early_data_state != SSL_EARLY_DATA_CONNECTING
713 || (s->session->ext.max_early_data == 0
714 && (psksess == NULL || psksess->ext.max_early_data == 0))) {
715 s->max_early_data = 0;
716 return EXT_RETURN_NOT_SENT;
718 edsess = s->session->ext.max_early_data != 0 ? s->session : psksess;
719 s->max_early_data = edsess->ext.max_early_data;
721 if ((s->ext.hostname == NULL && edsess->ext.hostname != NULL)
722 || (s->ext.hostname != NULL
723 && (edsess->ext.hostname == NULL
724 || strcmp(s->ext.hostname, edsess->ext.hostname) != 0))) {
725 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_EARLY_DATA,
726 SSL_R_INCONSISTENT_EARLY_DATA_SNI);
727 return EXT_RETURN_FAIL;
730 if ((s->ext.alpn == NULL && edsess->ext.alpn_selected != NULL)) {
731 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_EARLY_DATA,
732 SSL_R_INCONSISTENT_EARLY_DATA_ALPN);
733 return EXT_RETURN_FAIL;
737 * Verify that we are offering an ALPN protocol consistent with the early
740 if (edsess->ext.alpn_selected != NULL) {
741 PACKET prots, alpnpkt;
744 if (!PACKET_buf_init(&prots, s->ext.alpn, s->ext.alpn_len)) {
745 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_EARLY_DATA, ERR_R_INTERNAL_ERROR);
746 return EXT_RETURN_FAIL;
748 while (PACKET_get_length_prefixed_1(&prots, &alpnpkt)) {
749 if (PACKET_equal(&alpnpkt, edsess->ext.alpn_selected,
750 edsess->ext.alpn_selected_len)) {
756 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_EARLY_DATA,
757 SSL_R_INCONSISTENT_EARLY_DATA_ALPN);
758 return EXT_RETURN_FAIL;
762 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_early_data)
763 || !WPACKET_start_sub_packet_u16(pkt)
764 || !WPACKET_close(pkt)) {
765 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_EARLY_DATA, ERR_R_INTERNAL_ERROR);
766 return EXT_RETURN_FAIL;
770 * We set this to rejected here. Later, if the server acknowledges the
771 * extension, we set it to accepted.
773 s->ext.early_data = SSL_EARLY_DATA_REJECTED;
774 s->ext.early_data_ok = 1;
776 return EXT_RETURN_SENT;
779 #define F5_WORKAROUND_MIN_MSG_LEN 0xff
780 #define F5_WORKAROUND_MAX_MSG_LEN 0x200
783 * PSK pre binder overhead =
784 * 2 bytes for TLSEXT_TYPE_psk
785 * 2 bytes for extension length
786 * 2 bytes for identities list length
787 * 2 bytes for identity length
788 * 4 bytes for obfuscated_ticket_age
789 * 2 bytes for binder list length
790 * 1 byte for binder length
791 * The above excludes the number of bytes for the identity itself and the
792 * subsequent binder bytes
794 #define PSK_PRE_BINDER_OVERHEAD (2 + 2 + 2 + 2 + 4 + 2 + 1)
796 EXT_RETURN tls_construct_ctos_padding(SSL *s, WPACKET *pkt,
797 unsigned int context, X509 *x,
798 size_t chainidx, int *al)
800 unsigned char *padbytes;
803 if ((s->options & SSL_OP_TLSEXT_PADDING) == 0)
804 return EXT_RETURN_NOT_SENT;
807 * Add padding to workaround bugs in F5 terminators. See RFC7685.
808 * This code calculates the length of all extensions added so far but
809 * excludes the PSK extension (because that MUST be written last). Therefore
810 * this extension MUST always appear second to last.
812 if (!WPACKET_get_total_written(pkt, &hlen)) {
813 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_PADDING, ERR_R_INTERNAL_ERROR);
814 return EXT_RETURN_FAIL;
818 * If we're going to send a PSK then that will be written out after this
819 * extension, so we need to calculate how long it is going to be.
821 if (s->session->ssl_version == TLS1_3_VERSION
822 && s->session->ext.ticklen != 0
823 && s->session->cipher != NULL) {
824 const EVP_MD *md = ssl_md(s->session->cipher->algorithm2);
828 * Add the fixed PSK overhead, the identity length and the binder
831 hlen += PSK_PRE_BINDER_OVERHEAD + s->session->ext.ticklen
836 if (hlen > F5_WORKAROUND_MIN_MSG_LEN && hlen < F5_WORKAROUND_MAX_MSG_LEN) {
837 /* Calculate the amount of padding we need to add */
838 hlen = F5_WORKAROUND_MAX_MSG_LEN - hlen;
841 * Take off the size of extension header itself (2 bytes for type and
842 * 2 bytes for length bytes), but ensure that the extension is at least
843 * 1 byte long so as not to have an empty extension last (WebSphere 7.x,
844 * 8.x are intolerant of that condition)
851 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_padding)
852 || !WPACKET_sub_allocate_bytes_u16(pkt, hlen, &padbytes)) {
853 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_PADDING, ERR_R_INTERNAL_ERROR);
856 memset(padbytes, 0, hlen);
859 return EXT_RETURN_SENT;
863 * Construct the pre_shared_key extension
865 EXT_RETURN tls_construct_ctos_psk(SSL *s, WPACKET *pkt, unsigned int context,
866 X509 *x, size_t chainidx, int *al)
868 #ifndef OPENSSL_NO_TLS1_3
869 uint32_t now, agesec, agems = 0;
870 size_t reshashsize = 0, pskhashsize = 0, binderoffset, msglen;
871 unsigned char *resbinder = NULL, *pskbinder = NULL, *msgstart = NULL;
872 const EVP_MD *handmd = NULL, *mdres = NULL, *mdpsk = NULL;
873 EXT_RETURN ret = EXT_RETURN_FAIL;
876 s->session->ext.tick_identity = TLSEXT_PSK_BAD_IDENTITY;
879 * Note: At this stage of the code we only support adding a single
880 * resumption PSK. If we add support for multiple PSKs then the length
881 * calculations in the padding extension will need to be adjusted.
885 * If this is an incompatible or new session then we have nothing to resume
886 * so don't add this extension.
888 if (s->session->ssl_version != TLS1_3_VERSION
889 || (s->session->ext.ticklen == 0 && s->psksession == NULL))
890 return EXT_RETURN_NOT_SENT;
892 if (s->hello_retry_request)
893 handmd = ssl_handshake_md(s);
895 if (s->session->ext.ticklen != 0) {
896 /* Get the digest associated with the ciphersuite in the session */
897 if (s->session->cipher == NULL) {
898 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_PSK, ERR_R_INTERNAL_ERROR);
901 mdres = ssl_md(s->session->cipher->algorithm2);
904 * Don't recognize this cipher so we can't use the session.
910 if (s->hello_retry_request && mdres != handmd) {
912 * Selected ciphersuite hash does not match the hash for the session
913 * so we can't use it.
919 * Technically the C standard just says time() returns a time_t and says
920 * nothing about the encoding of that type. In practice most
921 * implementations follow POSIX which holds it as an integral type in
922 * seconds since epoch. We've already made the assumption that we can do
923 * this in multiple places in the code, so portability shouldn't be an
926 now = (uint32_t)time(NULL);
927 agesec = now - (uint32_t)s->session->time;
929 if (s->session->ext.tick_lifetime_hint < agesec) {
930 /* Ticket is too old. Ignore it. */
935 * Calculate age in ms. We're just doing it to nearest second. Should be
938 agems = agesec * (uint32_t)1000;
940 if (agesec != 0 && agems / (uint32_t)1000 != agesec) {
942 * Overflow. Shouldn't happen unless this is a *really* old session.
943 * If so we just ignore it.
949 * Obfuscate the age. Overflow here is fine, this addition is supposed
952 agems += s->session->ext.tick_age_add;
954 reshashsize = EVP_MD_size(mdres);
959 if (!dores && s->psksession == NULL)
960 return EXT_RETURN_NOT_SENT;
962 if (s->psksession != NULL) {
963 mdpsk = ssl_md(s->psksession->cipher->algorithm2);
966 * Don't recognize this cipher so we can't use the session.
967 * If this happens it's an application bug.
969 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_PSK, SSL_R_BAD_PSK);
973 if (s->hello_retry_request && mdpsk != handmd) {
975 * Selected ciphersuite hash does not match the hash for the PSK
976 * session. This is an application bug.
978 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_PSK, SSL_R_BAD_PSK);
982 pskhashsize = EVP_MD_size(mdpsk);
985 /* Create the extension, but skip over the binder for now */
986 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_psk)
987 || !WPACKET_start_sub_packet_u16(pkt)
988 || !WPACKET_start_sub_packet_u16(pkt)) {
989 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_PSK, ERR_R_INTERNAL_ERROR);
994 if (!WPACKET_sub_memcpy_u16(pkt, s->session->ext.tick,
995 s->session->ext.ticklen)
996 || !WPACKET_put_bytes_u32(pkt, agems)) {
997 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_PSK, ERR_R_INTERNAL_ERROR);
1002 if (s->psksession != NULL) {
1003 if (!WPACKET_sub_memcpy_u16(pkt, s->psksession_id,
1004 s->psksession_id_len)
1005 || !WPACKET_put_bytes_u32(pkt, 0)) {
1006 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_PSK, ERR_R_INTERNAL_ERROR);
1011 if (!WPACKET_close(pkt)
1012 || !WPACKET_get_total_written(pkt, &binderoffset)
1013 || !WPACKET_start_sub_packet_u16(pkt)
1015 && !WPACKET_sub_allocate_bytes_u8(pkt, reshashsize, &resbinder))
1016 || (s->psksession != NULL
1017 && !WPACKET_sub_allocate_bytes_u8(pkt, pskhashsize, &pskbinder))
1018 || !WPACKET_close(pkt)
1019 || !WPACKET_close(pkt)
1020 || !WPACKET_get_total_written(pkt, &msglen)
1022 * We need to fill in all the sub-packet lengths now so we can
1023 * calculate the HMAC of the message up to the binders
1025 || !WPACKET_fill_lengths(pkt)) {
1026 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_PSK, ERR_R_INTERNAL_ERROR);
1030 msgstart = WPACKET_get_curr(pkt) - msglen;
1033 && tls_psk_do_binder(s, mdres, msgstart, binderoffset, NULL,
1034 resbinder, s->session, 1, 0) != 1) {
1035 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_PSK, ERR_R_INTERNAL_ERROR);
1039 if (s->psksession != NULL
1040 && tls_psk_do_binder(s, mdpsk, msgstart, binderoffset, NULL,
1041 pskbinder, s->psksession, 1, 1) != 1) {
1042 SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_PSK, ERR_R_INTERNAL_ERROR);
1047 s->session->ext.tick_identity = 0;
1048 if (s->psksession != NULL)
1049 s->psksession->ext.tick_identity = (dores ? 1 : 0);
1051 ret = EXT_RETURN_SENT;
1060 * Parse the server's renegotiation binding and abort if it's not right
1062 int tls_parse_stoc_renegotiate(SSL *s, PACKET *pkt, unsigned int context,
1063 X509 *x, size_t chainidx, int *al)
1065 size_t expected_len = s->s3->previous_client_finished_len
1066 + s->s3->previous_server_finished_len;
1068 const unsigned char *data;
1070 /* Check for logic errors */
1071 if (!ossl_assert(expected_len == 0
1072 || s->s3->previous_client_finished_len != 0)
1073 || !ossl_assert(expected_len == 0
1074 || s->s3->previous_server_finished_len != 0)) {
1075 *al = SSL_AD_INTERNAL_ERROR;
1079 /* Parse the length byte */
1080 if (!PACKET_get_1_len(pkt, &ilen)) {
1081 SSLerr(SSL_F_TLS_PARSE_STOC_RENEGOTIATE,
1082 SSL_R_RENEGOTIATION_ENCODING_ERR);
1083 *al = SSL_AD_DECODE_ERROR;
1087 /* Consistency check */
1088 if (PACKET_remaining(pkt) != ilen) {
1089 SSLerr(SSL_F_TLS_PARSE_STOC_RENEGOTIATE,
1090 SSL_R_RENEGOTIATION_ENCODING_ERR);
1091 *al = SSL_AD_DECODE_ERROR;
1095 /* Check that the extension matches */
1096 if (ilen != expected_len) {
1097 SSLerr(SSL_F_TLS_PARSE_STOC_RENEGOTIATE,
1098 SSL_R_RENEGOTIATION_MISMATCH);
1099 *al = SSL_AD_ILLEGAL_PARAMETER;
1103 if (!PACKET_get_bytes(pkt, &data, s->s3->previous_client_finished_len)
1104 || memcmp(data, s->s3->previous_client_finished,
1105 s->s3->previous_client_finished_len) != 0) {
1106 SSLerr(SSL_F_TLS_PARSE_STOC_RENEGOTIATE,
1107 SSL_R_RENEGOTIATION_MISMATCH);
1108 *al = SSL_AD_ILLEGAL_PARAMETER;
1112 if (!PACKET_get_bytes(pkt, &data, s->s3->previous_server_finished_len)
1113 || memcmp(data, s->s3->previous_server_finished,
1114 s->s3->previous_server_finished_len) != 0) {
1115 SSLerr(SSL_F_TLS_PARSE_STOC_RENEGOTIATE,
1116 SSL_R_RENEGOTIATION_MISMATCH);
1117 *al = SSL_AD_ILLEGAL_PARAMETER;
1120 s->s3->send_connection_binding = 1;
1125 int tls_parse_stoc_server_name(SSL *s, PACKET *pkt, unsigned int context,
1126 X509 *x, size_t chainidx, int *al)
1128 if (s->ext.hostname == NULL) {
1129 *al = SSL_AD_INTERNAL_ERROR;
1133 if (PACKET_remaining(pkt) > 0) {
1134 *al = SSL_AD_DECODE_ERROR;
1139 if (s->session->ext.hostname != NULL) {
1140 *al = SSL_AD_INTERNAL_ERROR;
1143 s->session->ext.hostname = OPENSSL_strdup(s->ext.hostname);
1144 if (s->session->ext.hostname == NULL) {
1145 *al = SSL_AD_INTERNAL_ERROR;
1153 #ifndef OPENSSL_NO_EC
1154 int tls_parse_stoc_ec_pt_formats(SSL *s, PACKET *pkt, unsigned int context,
1155 X509 *x, size_t chainidx, int *al)
1157 unsigned int ecpointformats_len;
1158 PACKET ecptformatlist;
1160 if (!PACKET_as_length_prefixed_1(pkt, &ecptformatlist)) {
1161 *al = SSL_AD_DECODE_ERROR;
1165 ecpointformats_len = PACKET_remaining(&ecptformatlist);
1166 s->session->ext.ecpointformats_len = 0;
1168 OPENSSL_free(s->session->ext.ecpointformats);
1169 s->session->ext.ecpointformats = OPENSSL_malloc(ecpointformats_len);
1170 if (s->session->ext.ecpointformats == NULL) {
1171 *al = SSL_AD_INTERNAL_ERROR;
1175 s->session->ext.ecpointformats_len = ecpointformats_len;
1177 if (!PACKET_copy_bytes(&ecptformatlist,
1178 s->session->ext.ecpointformats,
1179 ecpointformats_len)) {
1180 *al = SSL_AD_INTERNAL_ERROR;
1189 int tls_parse_stoc_session_ticket(SSL *s, PACKET *pkt, unsigned int context,
1190 X509 *x, size_t chainidx, int *al)
1192 if (s->ext.session_ticket_cb != NULL &&
1193 !s->ext.session_ticket_cb(s, PACKET_data(pkt),
1194 PACKET_remaining(pkt),
1195 s->ext.session_ticket_cb_arg)) {
1196 *al = SSL_AD_INTERNAL_ERROR;
1200 if (!tls_use_ticket(s)) {
1201 *al = SSL_AD_UNSUPPORTED_EXTENSION;
1204 if (PACKET_remaining(pkt) > 0) {
1205 *al = SSL_AD_DECODE_ERROR;
1209 s->ext.ticket_expected = 1;
1214 #ifndef OPENSSL_NO_OCSP
1215 int tls_parse_stoc_status_request(SSL *s, PACKET *pkt, unsigned int context,
1216 X509 *x, size_t chainidx, int *al)
1219 * MUST only be sent if we've requested a status
1220 * request message. In TLS <= 1.2 it must also be empty.
1222 if (s->ext.status_type != TLSEXT_STATUSTYPE_ocsp) {
1223 *al = SSL_AD_UNSUPPORTED_EXTENSION;
1226 if (!SSL_IS_TLS13(s) && PACKET_remaining(pkt) > 0) {
1227 *al = SSL_AD_DECODE_ERROR;
1231 if (SSL_IS_TLS13(s)) {
1232 /* We only know how to handle this if it's for the first Certificate in
1233 * the chain. We ignore any other responses.
1237 return tls_process_cert_status_body(s, pkt, al);
1240 /* Set flag to expect CertificateStatus message */
1241 s->ext.status_expected = 1;
1248 #ifndef OPENSSL_NO_CT
1249 int tls_parse_stoc_sct(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
1250 size_t chainidx, int *al)
1253 * Only take it if we asked for it - i.e if there is no CT validation
1254 * callback set, then a custom extension MAY be processing it, so we
1255 * need to let control continue to flow to that.
1257 if (s->ct_validation_callback != NULL) {
1258 size_t size = PACKET_remaining(pkt);
1260 /* Simply copy it off for later processing */
1261 OPENSSL_free(s->ext.scts);
1264 s->ext.scts_len = size;
1266 s->ext.scts = OPENSSL_malloc(size);
1267 if (s->ext.scts == NULL
1268 || !PACKET_copy_bytes(pkt, s->ext.scts, size)) {
1269 *al = SSL_AD_INTERNAL_ERROR;
1274 ENDPOINT role = (context & SSL_EXT_TLS1_2_SERVER_HELLO) != 0
1275 ? ENDPOINT_CLIENT : ENDPOINT_BOTH;
1278 * If we didn't ask for it then there must be a custom extension,
1279 * otherwise this is unsolicited.
1281 if (custom_ext_find(&s->cert->custext, role,
1282 TLSEXT_TYPE_signed_certificate_timestamp,
1284 *al = TLS1_AD_UNSUPPORTED_EXTENSION;
1288 if (custom_ext_parse(s, context,
1289 TLSEXT_TYPE_signed_certificate_timestamp,
1290 PACKET_data(pkt), PACKET_remaining(pkt),
1291 x, chainidx, al) <= 0)
1300 #ifndef OPENSSL_NO_NEXTPROTONEG
1302 * ssl_next_proto_validate validates a Next Protocol Negotiation block. No
1303 * elements of zero length are allowed and the set of elements must exactly
1304 * fill the length of the block. Returns 1 on success or 0 on failure.
1306 static int ssl_next_proto_validate(PACKET *pkt)
1308 PACKET tmp_protocol;
1310 while (PACKET_remaining(pkt)) {
1311 if (!PACKET_get_length_prefixed_1(pkt, &tmp_protocol)
1312 || PACKET_remaining(&tmp_protocol) == 0)
1319 int tls_parse_stoc_npn(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
1320 size_t chainidx, int *al)
1322 unsigned char *selected;
1323 unsigned char selected_len;
1326 /* Check if we are in a renegotiation. If so ignore this extension */
1327 if (!SSL_IS_FIRST_HANDSHAKE(s))
1330 /* We must have requested it. */
1331 if (s->ctx->ext.npn_select_cb == NULL) {
1332 *al = SSL_AD_UNSUPPORTED_EXTENSION;
1336 /* The data must be valid */
1338 if (!ssl_next_proto_validate(&tmppkt)) {
1339 *al = SSL_AD_DECODE_ERROR;
1342 if (s->ctx->ext.npn_select_cb(s, &selected, &selected_len,
1344 PACKET_remaining(pkt),
1345 s->ctx->ext.npn_select_cb_arg) !=
1346 SSL_TLSEXT_ERR_OK) {
1347 *al = SSL_AD_INTERNAL_ERROR;
1352 * Could be non-NULL if server has sent multiple NPN extensions in
1353 * a single Serverhello
1355 OPENSSL_free(s->ext.npn);
1356 s->ext.npn = OPENSSL_malloc(selected_len);
1357 if (s->ext.npn == NULL) {
1358 *al = SSL_AD_INTERNAL_ERROR;
1362 memcpy(s->ext.npn, selected, selected_len);
1363 s->ext.npn_len = selected_len;
1364 s->s3->npn_seen = 1;
1370 int tls_parse_stoc_alpn(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
1371 size_t chainidx, int *al)
1375 /* We must have requested it. */
1376 if (!s->s3->alpn_sent) {
1377 *al = SSL_AD_UNSUPPORTED_EXTENSION;
1381 * The extension data consists of:
1382 * uint16 list_length
1383 * uint8 proto_length;
1384 * uint8 proto[proto_length];
1386 if (!PACKET_get_net_2_len(pkt, &len)
1387 || PACKET_remaining(pkt) != len || !PACKET_get_1_len(pkt, &len)
1388 || PACKET_remaining(pkt) != len) {
1389 *al = SSL_AD_DECODE_ERROR;
1392 OPENSSL_free(s->s3->alpn_selected);
1393 s->s3->alpn_selected = OPENSSL_malloc(len);
1394 if (s->s3->alpn_selected == NULL) {
1395 *al = SSL_AD_INTERNAL_ERROR;
1398 if (!PACKET_copy_bytes(pkt, s->s3->alpn_selected, len)) {
1399 *al = SSL_AD_DECODE_ERROR;
1402 s->s3->alpn_selected_len = len;
1404 if (s->session->ext.alpn_selected == NULL
1405 || s->session->ext.alpn_selected_len != len
1406 || memcmp(s->session->ext.alpn_selected, s->s3->alpn_selected, len)
1408 /* ALPN not consistent with the old session so cannot use early_data */
1409 s->ext.early_data_ok = 0;
1412 /* If a new session then update it with the selected ALPN */
1413 s->session->ext.alpn_selected =
1414 OPENSSL_memdup(s->s3->alpn_selected, s->s3->alpn_selected_len);
1415 if (s->session->ext.alpn_selected == NULL) {
1416 *al = SSL_AD_INTERNAL_ERROR;
1419 s->session->ext.alpn_selected_len = s->s3->alpn_selected_len;
1425 #ifndef OPENSSL_NO_SRTP
1426 int tls_parse_stoc_use_srtp(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
1427 size_t chainidx, int *al)
1429 unsigned int id, ct, mki;
1431 STACK_OF(SRTP_PROTECTION_PROFILE) *clnt;
1432 SRTP_PROTECTION_PROFILE *prof;
1434 if (!PACKET_get_net_2(pkt, &ct) || ct != 2
1435 || !PACKET_get_net_2(pkt, &id)
1436 || !PACKET_get_1(pkt, &mki)
1437 || PACKET_remaining(pkt) != 0) {
1438 SSLerr(SSL_F_TLS_PARSE_STOC_USE_SRTP,
1439 SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST);
1440 *al = SSL_AD_DECODE_ERROR;
1445 /* Must be no MKI, since we never offer one */
1446 SSLerr(SSL_F_TLS_PARSE_STOC_USE_SRTP, SSL_R_BAD_SRTP_MKI_VALUE);
1447 *al = SSL_AD_ILLEGAL_PARAMETER;
1451 /* Throw an error if the server gave us an unsolicited extension */
1452 clnt = SSL_get_srtp_profiles(s);
1454 SSLerr(SSL_F_TLS_PARSE_STOC_USE_SRTP, SSL_R_NO_SRTP_PROFILES);
1455 *al = SSL_AD_DECODE_ERROR;
1460 * Check to see if the server gave us something we support (and
1461 * presumably offered)
1463 for (i = 0; i < sk_SRTP_PROTECTION_PROFILE_num(clnt); i++) {
1464 prof = sk_SRTP_PROTECTION_PROFILE_value(clnt, i);
1466 if (prof->id == id) {
1467 s->srtp_profile = prof;
1473 SSLerr(SSL_F_TLS_PARSE_STOC_USE_SRTP,
1474 SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST);
1475 *al = SSL_AD_DECODE_ERROR;
1480 int tls_parse_stoc_etm(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
1481 size_t chainidx, int *al)
1483 /* Ignore if inappropriate ciphersuite */
1484 if (!(s->options & SSL_OP_NO_ENCRYPT_THEN_MAC)
1485 && s->s3->tmp.new_cipher->algorithm_mac != SSL_AEAD
1486 && s->s3->tmp.new_cipher->algorithm_enc != SSL_RC4)
1492 int tls_parse_stoc_ems(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
1493 size_t chainidx, int *al)
1495 s->s3->flags |= TLS1_FLAGS_RECEIVED_EXTMS;
1497 s->session->flags |= SSL_SESS_FLAG_EXTMS;
1502 int tls_parse_stoc_key_share(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
1503 size_t chainidx, int *al)
1505 #ifndef OPENSSL_NO_TLS1_3
1506 unsigned int group_id;
1508 EVP_PKEY *ckey = s->s3->tmp.pkey, *skey = NULL;
1511 if (ckey == NULL || s->s3->peer_tmp != NULL) {
1512 *al = SSL_AD_INTERNAL_ERROR;
1513 SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE, ERR_R_INTERNAL_ERROR);
1517 if (!PACKET_get_net_2(pkt, &group_id)) {
1518 *al = SSL_AD_DECODE_ERROR;
1519 SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE, SSL_R_LENGTH_MISMATCH);
1523 if ((context & SSL_EXT_TLS1_3_HELLO_RETRY_REQUEST) != 0) {
1524 unsigned const char *pcurves = NULL;
1525 size_t i, num_curves;
1527 if (PACKET_remaining(pkt) != 0) {
1528 *al = SSL_AD_DECODE_ERROR;
1529 SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE, SSL_R_LENGTH_MISMATCH);
1534 * It is an error if the HelloRetryRequest wants a key_share that we
1535 * already sent in the first ClientHello
1537 if (group_id == s->s3->group_id) {
1538 *al = SSL_AD_ILLEGAL_PARAMETER;
1539 SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE, SSL_R_BAD_KEY_SHARE);
1543 /* Validate the selected group is one we support */
1544 if (!tls1_get_curvelist(s, 0, &pcurves, &num_curves)) {
1545 SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE, ERR_R_INTERNAL_ERROR);
1548 for (i = 0; i < num_curves; i++, pcurves += 2) {
1549 if (group_id == bytestogroup(pcurves))
1553 || !tls_curve_allowed(s, pcurves, SSL_SECOP_CURVE_SUPPORTED)) {
1554 *al = SSL_AD_ILLEGAL_PARAMETER;
1555 SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE, SSL_R_BAD_KEY_SHARE);
1559 s->s3->group_id = group_id;
1560 EVP_PKEY_free(s->s3->tmp.pkey);
1561 s->s3->tmp.pkey = NULL;
1565 if (group_id != s->s3->group_id) {
1567 * This isn't for the group that we sent in the original
1570 *al = SSL_AD_ILLEGAL_PARAMETER;
1571 SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE, SSL_R_BAD_KEY_SHARE);
1575 if (!PACKET_as_length_prefixed_2(pkt, &encoded_pt)
1576 || PACKET_remaining(&encoded_pt) == 0) {
1577 *al = SSL_AD_DECODE_ERROR;
1578 SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE, SSL_R_LENGTH_MISMATCH);
1582 skey = ssl_generate_pkey(ckey);
1584 *al = SSL_AD_INTERNAL_ERROR;
1585 SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE, ERR_R_MALLOC_FAILURE);
1588 if (!EVP_PKEY_set1_tls_encodedpoint(skey, PACKET_data(&encoded_pt),
1589 PACKET_remaining(&encoded_pt))) {
1590 *al = SSL_AD_ILLEGAL_PARAMETER;
1591 SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE, SSL_R_BAD_ECPOINT);
1592 EVP_PKEY_free(skey);
1596 if (ssl_derive(s, ckey, skey, 1) == 0) {
1597 *al = SSL_AD_INTERNAL_ERROR;
1598 SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE, ERR_R_INTERNAL_ERROR);
1599 EVP_PKEY_free(skey);
1602 s->s3->peer_tmp = skey;
1608 int tls_parse_stoc_cookie(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
1609 size_t chainidx, int *al)
1613 if (!PACKET_as_length_prefixed_2(pkt, &cookie)
1614 || !PACKET_memdup(&cookie, &s->ext.tls13_cookie,
1615 &s->ext.tls13_cookie_len)) {
1616 *al = SSL_AD_DECODE_ERROR;
1617 SSLerr(SSL_F_TLS_PARSE_STOC_COOKIE, SSL_R_LENGTH_MISMATCH);
1624 int tls_parse_stoc_early_data(SSL *s, PACKET *pkt, unsigned int context,
1625 X509 *x, size_t chainidx, int *al)
1627 if (context == SSL_EXT_TLS1_3_NEW_SESSION_TICKET) {
1628 unsigned long max_early_data;
1630 if (!PACKET_get_net_4(pkt, &max_early_data)
1631 || PACKET_remaining(pkt) != 0) {
1632 SSLerr(SSL_F_TLS_PARSE_STOC_EARLY_DATA,
1633 SSL_R_INVALID_MAX_EARLY_DATA);
1634 *al = SSL_AD_DECODE_ERROR;
1638 s->session->ext.max_early_data = max_early_data;
1643 if (PACKET_remaining(pkt) != 0) {
1644 *al = SSL_AD_DECODE_ERROR;
1648 if (!s->ext.early_data_ok
1650 || s->session->ext.tick_identity != 0) {
1652 * If we get here then we didn't send early data, or we didn't resume
1653 * using the first identity, or the SNI/ALPN is not consistent so the
1654 * server should not be accepting it.
1656 *al = SSL_AD_ILLEGAL_PARAMETER;
1660 s->ext.early_data = SSL_EARLY_DATA_ACCEPTED;
1665 int tls_parse_stoc_psk(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
1666 size_t chainidx, int *al)
1668 #ifndef OPENSSL_NO_TLS1_3
1669 unsigned int identity;
1671 if (!PACKET_get_net_2(pkt, &identity) || PACKET_remaining(pkt) != 0) {
1672 *al = SSL_AD_DECODE_ERROR;
1673 SSLerr(SSL_F_TLS_PARSE_STOC_PSK, SSL_R_LENGTH_MISMATCH);
1677 if (s->session->ext.tick_identity == (int)identity) {
1679 SSL_SESSION_free(s->psksession);
1680 s->psksession = NULL;
1684 if (s->psksession == NULL
1685 || s->psksession->ext.tick_identity != (int)identity) {
1686 *al = SSL_AD_ILLEGAL_PARAMETER;
1687 SSLerr(SSL_F_TLS_PARSE_STOC_PSK, SSL_R_BAD_PSK_IDENTITY);
1692 * If we used the external PSK for sending early_data then s->early_secret
1693 * is already set up, so don't overwrite it. Otherwise we copy the
1694 * early_secret across that we generated earlier.
1696 if ((s->early_data_state != SSL_EARLY_DATA_WRITE_RETRY
1697 && s->early_data_state != SSL_EARLY_DATA_FINISHED_WRITING)
1698 || s->session->ext.max_early_data > 0
1699 || s->psksession->ext.max_early_data == 0)
1700 memcpy(s->early_secret, s->psksession->early_secret, EVP_MAX_MD_SIZE);
1702 SSL_SESSION_free(s->session);
1703 s->session = s->psksession;
1704 s->psksession = NULL;