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
11 #include "internal/nelem.h"
12 #include "../ssl_locl.h"
13 #include "statem_locl.h"
15 static int final_renegotiate(SSL *s, unsigned int context, int sent,
17 static int init_server_name(SSL *s, unsigned int context);
18 static int final_server_name(SSL *s, unsigned int context, int sent,
21 static int final_ec_pt_formats(SSL *s, unsigned int context, int sent,
24 static int init_session_ticket(SSL *s, unsigned int context);
25 #ifndef OPENSSL_NO_OCSP
26 static int init_status_request(SSL *s, unsigned int context);
28 #ifndef OPENSSL_NO_NEXTPROTONEG
29 static int init_npn(SSL *s, unsigned int context);
31 static int init_alpn(SSL *s, unsigned int context);
32 static int final_alpn(SSL *s, unsigned int context, int sent, int *al);
33 static int init_sig_algs(SSL *s, unsigned int context);
34 static int init_certificate_authorities(SSL *s, unsigned int context);
35 static EXT_RETURN tls_construct_certificate_authorities(SSL *s, WPACKET *pkt,
40 static int tls_parse_certificate_authorities(SSL *s, PACKET *pkt,
41 unsigned int context, X509 *x,
42 size_t chainidx, int *al);
43 #ifndef OPENSSL_NO_SRP
44 static int init_srp(SSL *s, unsigned int context);
46 static int init_etm(SSL *s, unsigned int context);
47 static int init_ems(SSL *s, unsigned int context);
48 static int final_ems(SSL *s, unsigned int context, int sent, int *al);
49 static int init_psk_kex_modes(SSL *s, unsigned int context);
51 static int final_key_share(SSL *s, unsigned int context, int sent, int *al);
53 #ifndef OPENSSL_NO_SRTP
54 static int init_srtp(SSL *s, unsigned int context);
56 static int final_sig_algs(SSL *s, unsigned int context, int sent, int *al);
57 static int final_early_data(SSL *s, unsigned int context, int sent, int *al);
59 /* Structure to define a built-in extension */
60 typedef struct extensions_definition_st {
61 /* The defined type for the extension */
64 * The context that this extension applies to, e.g. what messages and
69 * Initialise extension before parsing. Always called for relevant contexts
70 * even if extension not present
72 int (*init)(SSL *s, unsigned int context);
73 /* Parse extension sent from client to server */
74 int (*parse_ctos)(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
75 size_t chainidx, int *al);
76 /* Parse extension send from server to client */
77 int (*parse_stoc)(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
78 size_t chainidx, int *al);
79 /* Construct extension sent from server to client */
80 EXT_RETURN (*construct_stoc)(SSL *s, WPACKET *pkt, unsigned int context,
81 X509 *x, size_t chainidx, int *al);
82 /* Construct extension sent from client to server */
83 EXT_RETURN (*construct_ctos)(SSL *s, WPACKET *pkt, unsigned int context,
84 X509 *x, size_t chainidx, int *al);
86 * Finalise extension after parsing. Always called where an extensions was
87 * initialised even if the extension was not present. |sent| is set to 1 if
88 * the extension was seen, or 0 otherwise.
90 int (*final)(SSL *s, unsigned int context, int sent, int *al);
91 } EXTENSION_DEFINITION;
94 * Definitions of all built-in extensions. NOTE: Changes in the number or order
95 * of these extensions should be mirrored with equivalent changes to the
96 * indexes ( TLSEXT_IDX_* ) defined in ssl_locl.h.
97 * Each extension has an initialiser, a client and
98 * server side parser and a finaliser. The initialiser is called (if the
99 * extension is relevant to the given context) even if we did not see the
100 * extension in the message that we received. The parser functions are only
101 * called if we see the extension in the message. The finalisers are always
102 * called if the initialiser was called.
103 * There are also server and client side constructor functions which are always
104 * called during message construction if the extension is relevant for the
106 * The initialisation, parsing, finalisation and construction functions are
107 * always called in the order defined in this list. Some extensions may depend
108 * on others having been processed first, so the order of this list is
110 * The extension context is defined by a series of flags which specify which
111 * messages the extension is relevant to. These flags also specify whether the
112 * extension is relevant to a particular protocol or protocol version.
114 * TODO(TLS1.3): Make sure we have a test to check the consistency of these
116 * NOTE: WebSphere Application Server 7+ cannot handle empty extensions at
117 * the end, keep these extensions before signature_algorithm.
119 #define INVALID_EXTENSION { 0x10000, 0, NULL, NULL, NULL, NULL, NULL, NULL }
120 static const EXTENSION_DEFINITION ext_defs[] = {
122 TLSEXT_TYPE_renegotiate,
123 SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO
124 | SSL_EXT_SSL3_ALLOWED | SSL_EXT_TLS1_2_AND_BELOW_ONLY,
125 NULL, tls_parse_ctos_renegotiate, tls_parse_stoc_renegotiate,
126 tls_construct_stoc_renegotiate, tls_construct_ctos_renegotiate,
130 TLSEXT_TYPE_server_name,
131 SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO
132 | SSL_EXT_TLS1_3_ENCRYPTED_EXTENSIONS,
134 tls_parse_ctos_server_name, tls_parse_stoc_server_name,
135 tls_construct_stoc_server_name, tls_construct_ctos_server_name,
138 #ifndef OPENSSL_NO_SRP
141 SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_AND_BELOW_ONLY,
142 init_srp, tls_parse_ctos_srp, NULL, NULL, tls_construct_ctos_srp, NULL
147 #ifndef OPENSSL_NO_EC
149 TLSEXT_TYPE_ec_point_formats,
150 SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO
151 | SSL_EXT_TLS1_2_AND_BELOW_ONLY,
152 NULL, tls_parse_ctos_ec_pt_formats, tls_parse_stoc_ec_pt_formats,
153 tls_construct_stoc_ec_pt_formats, tls_construct_ctos_ec_pt_formats,
157 TLSEXT_TYPE_supported_groups,
158 SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_3_ENCRYPTED_EXTENSIONS,
159 NULL, tls_parse_ctos_supported_groups, NULL,
160 tls_construct_stoc_supported_groups,
161 tls_construct_ctos_supported_groups, NULL
168 TLSEXT_TYPE_session_ticket,
169 SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO
170 | SSL_EXT_TLS1_2_AND_BELOW_ONLY,
171 init_session_ticket, tls_parse_ctos_session_ticket,
172 tls_parse_stoc_session_ticket, tls_construct_stoc_session_ticket,
173 tls_construct_ctos_session_ticket, NULL
175 #ifndef OPENSSL_NO_OCSP
177 TLSEXT_TYPE_status_request,
178 SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO
179 | SSL_EXT_TLS1_3_CERTIFICATE,
180 init_status_request, tls_parse_ctos_status_request,
181 tls_parse_stoc_status_request, tls_construct_stoc_status_request,
182 tls_construct_ctos_status_request, NULL
187 #ifndef OPENSSL_NO_NEXTPROTONEG
189 TLSEXT_TYPE_next_proto_neg,
190 SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO
191 | SSL_EXT_TLS1_2_AND_BELOW_ONLY,
192 init_npn, tls_parse_ctos_npn, tls_parse_stoc_npn,
193 tls_construct_stoc_next_proto_neg, tls_construct_ctos_npn, NULL
200 * Must appear in this list after server_name so that finalisation
201 * happens after server_name callbacks
203 TLSEXT_TYPE_application_layer_protocol_negotiation,
204 SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO
205 | SSL_EXT_TLS1_3_ENCRYPTED_EXTENSIONS,
206 init_alpn, tls_parse_ctos_alpn, tls_parse_stoc_alpn,
207 tls_construct_stoc_alpn, tls_construct_ctos_alpn, final_alpn
209 #ifndef OPENSSL_NO_SRTP
211 TLSEXT_TYPE_use_srtp,
212 SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO
213 | SSL_EXT_TLS1_3_ENCRYPTED_EXTENSIONS | SSL_EXT_DTLS_ONLY,
214 init_srtp, tls_parse_ctos_use_srtp, tls_parse_stoc_use_srtp,
215 tls_construct_stoc_use_srtp, tls_construct_ctos_use_srtp, NULL
221 TLSEXT_TYPE_encrypt_then_mac,
222 SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO
223 | SSL_EXT_TLS1_2_AND_BELOW_ONLY,
224 init_etm, tls_parse_ctos_etm, tls_parse_stoc_etm,
225 tls_construct_stoc_etm, tls_construct_ctos_etm, NULL
227 #ifndef OPENSSL_NO_CT
229 TLSEXT_TYPE_signed_certificate_timestamp,
230 SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO
231 | SSL_EXT_TLS1_3_CERTIFICATE,
234 * No server side support for this, but can be provided by a custom
235 * extension. This is an exception to the rule that custom extensions
236 * cannot override built in ones.
238 NULL, tls_parse_stoc_sct, NULL, tls_construct_ctos_sct, NULL
244 TLSEXT_TYPE_extended_master_secret,
245 SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO
246 | SSL_EXT_TLS1_2_AND_BELOW_ONLY,
247 init_ems, tls_parse_ctos_ems, tls_parse_stoc_ems,
248 tls_construct_stoc_ems, tls_construct_ctos_ems, final_ems
251 TLSEXT_TYPE_signature_algorithms,
252 SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_3_CERTIFICATE_REQUEST,
253 init_sig_algs, tls_parse_ctos_sig_algs,
254 tls_parse_ctos_sig_algs, tls_construct_ctos_sig_algs,
255 tls_construct_ctos_sig_algs, final_sig_algs
258 TLSEXT_TYPE_supported_versions,
259 SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS_IMPLEMENTATION_ONLY
260 | SSL_EXT_TLS1_3_ONLY,
262 /* Processed inline as part of version selection */
263 NULL, NULL, NULL, tls_construct_ctos_supported_versions, NULL
266 TLSEXT_TYPE_psk_kex_modes,
267 SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS_IMPLEMENTATION_ONLY
268 | SSL_EXT_TLS1_3_ONLY,
269 init_psk_kex_modes, tls_parse_ctos_psk_kex_modes, NULL, NULL,
270 tls_construct_ctos_psk_kex_modes, NULL
272 #ifndef OPENSSL_NO_EC
275 * Must be in this list after supported_groups. We need that to have
276 * been parsed before we do this one.
278 TLSEXT_TYPE_key_share,
279 SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_3_SERVER_HELLO
280 | SSL_EXT_TLS1_3_HELLO_RETRY_REQUEST | SSL_EXT_TLS_IMPLEMENTATION_ONLY
281 | SSL_EXT_TLS1_3_ONLY,
282 NULL, tls_parse_ctos_key_share, tls_parse_stoc_key_share,
283 tls_construct_stoc_key_share, tls_construct_ctos_key_share,
289 SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_3_HELLO_RETRY_REQUEST
290 | SSL_EXT_TLS_IMPLEMENTATION_ONLY | SSL_EXT_TLS1_3_ONLY,
291 NULL, NULL, tls_parse_stoc_cookie, NULL, tls_construct_ctos_cookie,
296 * Special unsolicited ServerHello extension only used when
297 * SSL_OP_CRYPTOPRO_TLSEXT_BUG is set
299 TLSEXT_TYPE_cryptopro_bug,
300 SSL_EXT_TLS1_2_SERVER_HELLO | SSL_EXT_TLS1_2_AND_BELOW_ONLY,
301 NULL, NULL, NULL, tls_construct_stoc_cryptopro_bug, NULL, NULL
304 TLSEXT_TYPE_early_data,
305 SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_3_ENCRYPTED_EXTENSIONS
306 | SSL_EXT_TLS1_3_NEW_SESSION_TICKET,
307 NULL, tls_parse_ctos_early_data, tls_parse_stoc_early_data,
308 tls_construct_stoc_early_data, tls_construct_ctos_early_data,
312 TLSEXT_TYPE_certificate_authorities,
313 SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_3_CERTIFICATE_REQUEST
314 | SSL_EXT_TLS1_3_ONLY,
315 init_certificate_authorities,
316 tls_parse_certificate_authorities, tls_parse_certificate_authorities,
317 tls_construct_certificate_authorities,
318 tls_construct_certificate_authorities, NULL,
321 /* Must be immediately before pre_shared_key */
323 SSL_EXT_CLIENT_HELLO,
325 /* We send this, but don't read it */
326 NULL, NULL, NULL, tls_construct_ctos_padding, NULL
329 /* Required by the TLSv1.3 spec to always be the last extension */
331 SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_3_SERVER_HELLO
332 | SSL_EXT_TLS_IMPLEMENTATION_ONLY | SSL_EXT_TLS1_3_ONLY,
333 NULL, tls_parse_ctos_psk, tls_parse_stoc_psk, tls_construct_stoc_psk,
334 tls_construct_ctos_psk, NULL
338 /* Check whether an extension's context matches the current context */
339 static int validate_context(SSL *s, unsigned int extctx, unsigned int thisctx)
341 /* Check we're allowed to use this extension in this context */
342 if ((thisctx & extctx) == 0)
345 if (SSL_IS_DTLS(s)) {
346 if ((extctx & SSL_EXT_TLS_ONLY) != 0)
348 } else if ((extctx & SSL_EXT_DTLS_ONLY) != 0) {
356 * Verify whether we are allowed to use the extension |type| in the current
357 * |context|. Returns 1 to indicate the extension is allowed or unknown or 0 to
358 * indicate the extension is not allowed. If returning 1 then |*found| is set to
359 * the definition for the extension we found.
361 static int verify_extension(SSL *s, unsigned int context, unsigned int type,
362 custom_ext_methods *meths, RAW_EXTENSION *rawexlist,
363 RAW_EXTENSION **found)
366 size_t builtin_num = OSSL_NELEM(ext_defs);
367 const EXTENSION_DEFINITION *thisext;
369 for (i = 0, thisext = ext_defs; i < builtin_num; i++, thisext++) {
370 if (type == thisext->type) {
371 if (!validate_context(s, thisext->context, context))
374 *found = &rawexlist[i];
379 /* Check the custom extensions */
382 ENDPOINT role = ENDPOINT_BOTH;
383 custom_ext_method *meth = NULL;
385 if ((context & SSL_EXT_CLIENT_HELLO) != 0)
386 role = ENDPOINT_SERVER;
387 else if ((context & SSL_EXT_TLS1_2_SERVER_HELLO) != 0)
388 role = ENDPOINT_CLIENT;
390 meth = custom_ext_find(meths, role, type, &offset);
392 if (!validate_context(s, meth->context, context))
394 *found = &rawexlist[offset + builtin_num];
399 /* Unknown extension. We allow it */
405 * Check whether the context defined for an extension |extctx| means whether
406 * the extension is relevant for the current context |thisctx| or not. Returns
407 * 1 if the extension is relevant for this context, and 0 otherwise
409 int extension_is_relevant(SSL *s, unsigned int extctx, unsigned int thisctx)
414 * For HRR we haven't selected the version yet but we know it will be
417 if ((thisctx & SSL_EXT_TLS1_3_HELLO_RETRY_REQUEST) != 0)
420 is_tls13 = SSL_IS_TLS13(s);
423 && (extctx & SSL_EXT_TLS_IMPLEMENTATION_ONLY) != 0)
424 || (s->version == SSL3_VERSION
425 && (extctx & SSL_EXT_SSL3_ALLOWED) == 0)
426 || (is_tls13 && (extctx & SSL_EXT_TLS1_2_AND_BELOW_ONLY) != 0)
427 || (!is_tls13 && (extctx & SSL_EXT_TLS1_3_ONLY) != 0)
428 || (s->hit && (extctx & SSL_EXT_IGNORE_ON_RESUMPTION) != 0))
435 * Gather a list of all the extensions from the data in |packet]. |context|
436 * tells us which message this extension is for. The raw extension data is
437 * stored in |*res| on success. In the event of an error the alert type to use
438 * is stored in |*al|. We don't actually process the content of the extensions
439 * yet, except to check their types. This function also runs the initialiser
440 * functions for all known extensions if |init| is nonzero (whether we have
441 * collected them or not). If successful the caller is responsible for freeing
442 * the contents of |*res|.
444 * Per http://tools.ietf.org/html/rfc5246#section-7.4.1.4, there may not be
445 * more than one extension of the same type in a ClientHello or ServerHello.
446 * This function returns 1 if all extensions are unique and we have parsed their
447 * types, and 0 if the extensions contain duplicates, could not be successfully
448 * found, or an internal error occurred. We only check duplicates for
449 * extensions that we know about. We ignore others.
451 int tls_collect_extensions(SSL *s, PACKET *packet, unsigned int context,
452 RAW_EXTENSION **res, int *al, size_t *len,
455 PACKET extensions = *packet;
458 custom_ext_methods *exts = &s->cert->custext;
459 RAW_EXTENSION *raw_extensions = NULL;
460 const EXTENSION_DEFINITION *thisexd;
465 * Initialise server side custom extensions. Client side is done during
466 * construction of extensions for the ClientHello.
468 if ((context & SSL_EXT_CLIENT_HELLO) != 0)
469 custom_ext_init(&s->cert->custext);
471 num_exts = OSSL_NELEM(ext_defs) + (exts != NULL ? exts->meths_count : 0);
472 raw_extensions = OPENSSL_zalloc(num_exts * sizeof(*raw_extensions));
473 if (raw_extensions == NULL) {
474 *al = SSL_AD_INTERNAL_ERROR;
475 SSLerr(SSL_F_TLS_COLLECT_EXTENSIONS, ERR_R_MALLOC_FAILURE);
480 while (PACKET_remaining(&extensions) > 0) {
481 unsigned int type, idx;
483 RAW_EXTENSION *thisex;
485 if (!PACKET_get_net_2(&extensions, &type) ||
486 !PACKET_get_length_prefixed_2(&extensions, &extension)) {
487 SSLerr(SSL_F_TLS_COLLECT_EXTENSIONS, SSL_R_BAD_EXTENSION);
488 *al = SSL_AD_DECODE_ERROR;
492 * Verify this extension is allowed. We only check duplicates for
493 * extensions that we recognise. We also have a special case for the
494 * PSK extension, which must be the last one in the ClientHello.
496 if (!verify_extension(s, context, type, exts, raw_extensions, &thisex)
497 || (thisex != NULL && thisex->present == 1)
498 || (type == TLSEXT_TYPE_psk
499 && (context & SSL_EXT_CLIENT_HELLO) != 0
500 && PACKET_remaining(&extensions) != 0)) {
501 SSLerr(SSL_F_TLS_COLLECT_EXTENSIONS, SSL_R_BAD_EXTENSION);
502 *al = SSL_AD_ILLEGAL_PARAMETER;
505 idx = thisex - raw_extensions;
507 * Check that we requested this extension (if appropriate). Requests can
508 * be sent in the ClientHello and CertificateRequest. Unsolicited
509 * extensions can be sent in the NewSessionTicket. We only do this for
510 * the built-in extensions. Custom extensions have a different but
511 * similar check elsewhere.
513 * - The HRR cookie extension is unsolicited
514 * - The renegotiate extension is unsolicited (the client signals
515 * support via an SCSV)
516 * - The signed_certificate_timestamp extension can be provided by a
517 * custom extension or by the built-in version. We let the extension
518 * itself handle unsolicited response checks.
520 if (idx < OSSL_NELEM(ext_defs)
521 && (context & (SSL_EXT_CLIENT_HELLO
522 | SSL_EXT_TLS1_3_CERTIFICATE_REQUEST
523 | SSL_EXT_TLS1_3_NEW_SESSION_TICKET)) == 0
524 && type != TLSEXT_TYPE_cookie
525 && type != TLSEXT_TYPE_renegotiate
526 && type != TLSEXT_TYPE_signed_certificate_timestamp
527 && (s->ext.extflags[idx] & SSL_EXT_FLAG_SENT) == 0) {
528 SSLerr(SSL_F_TLS_COLLECT_EXTENSIONS, SSL_R_UNSOLICITED_EXTENSION);
529 *al = SSL_AD_UNSUPPORTED_EXTENSION;
532 if (thisex != NULL) {
533 thisex->data = extension;
536 thisex->received_order = i++;
538 s->ext.debug_cb(s, !s->server, thisex->type,
539 PACKET_data(&thisex->data),
540 PACKET_remaining(&thisex->data),
547 * Initialise all known extensions relevant to this context,
548 * whether we have found them or not
550 for (thisexd = ext_defs, i = 0; i < OSSL_NELEM(ext_defs);
552 if (thisexd->init != NULL && (thisexd->context & context) != 0
553 && extension_is_relevant(s, thisexd->context, context)
554 && !thisexd->init(s, context)) {
555 *al = SSL_AD_INTERNAL_ERROR;
561 *res = raw_extensions;
567 OPENSSL_free(raw_extensions);
572 * Runs the parser for a given extension with index |idx|. |exts| contains the
573 * list of all parsed extensions previously collected by
574 * tls_collect_extensions(). The parser is only run if it is applicable for the
575 * given |context| and the parser has not already been run. If this is for a
576 * Certificate message, then we also provide the parser with the relevant
577 * Certificate |x| and its position in the |chainidx| with 0 being the first
578 * Certificate. Returns 1 on success or 0 on failure. In the event of a failure
579 * |*al| is populated with a suitable alert code. If an extension is not present
580 * this counted as success.
582 int tls_parse_extension(SSL *s, TLSEXT_INDEX idx, int context,
583 RAW_EXTENSION *exts, X509 *x, size_t chainidx, int *al)
585 RAW_EXTENSION *currext = &exts[idx];
586 int (*parser)(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
587 size_t chainidx, int *al) = NULL;
589 /* Skip if the extension is not present */
590 if (!currext->present)
593 /* Skip if we've already parsed this extension */
599 if (idx < OSSL_NELEM(ext_defs)) {
600 /* We are handling a built-in extension */
601 const EXTENSION_DEFINITION *extdef = &ext_defs[idx];
603 /* Check if extension is defined for our protocol. If not, skip */
604 if (!extension_is_relevant(s, extdef->context, context))
607 parser = s->server ? extdef->parse_ctos : extdef->parse_stoc;
610 return parser(s, &currext->data, context, x, chainidx, al);
613 * If the parser is NULL we fall through to the custom extension
618 /* Parse custom extensions */
619 if (custom_ext_parse(s, context, currext->type,
620 PACKET_data(&currext->data),
621 PACKET_remaining(&currext->data),
622 x, chainidx, al) <= 0)
629 * Parse all remaining extensions that have not yet been parsed. Also calls the
630 * finalisation for all extensions at the end if |fin| is nonzero, whether we
631 * collected them or not. Returns 1 for success or 0 for failure. If we are
632 * working on a Certificate message then we also pass the Certificate |x| and
633 * its position in the |chainidx|, with 0 being the first certificate. On
634 * failure, |*al| is populated with a suitable alert code.
636 int tls_parse_all_extensions(SSL *s, int context, RAW_EXTENSION *exts, X509 *x,
637 size_t chainidx, int *al, int fin)
639 size_t i, numexts = OSSL_NELEM(ext_defs);
640 const EXTENSION_DEFINITION *thisexd;
642 /* Calculate the number of extensions in the extensions list */
643 numexts += s->cert->custext.meths_count;
645 /* Parse each extension in turn */
646 for (i = 0; i < numexts; i++) {
647 if (!tls_parse_extension(s, i, context, exts, x, chainidx, al))
653 * Finalise all known extensions relevant to this context,
654 * whether we have found them or not
656 for (i = 0, thisexd = ext_defs; i < OSSL_NELEM(ext_defs);
658 if (thisexd->final != NULL && (thisexd->context & context) != 0
659 && !thisexd->final(s, context, exts[i].present, al))
667 int should_add_extension(SSL *s, unsigned int extctx, unsigned int thisctx,
670 /* Skip if not relevant for our context */
671 if ((extctx & thisctx) == 0)
674 /* Check if this extension is defined for our protocol. If not, skip */
675 if ((SSL_IS_DTLS(s) && (extctx & SSL_EXT_TLS_IMPLEMENTATION_ONLY) != 0)
676 || (s->version == SSL3_VERSION
677 && (extctx & SSL_EXT_SSL3_ALLOWED) == 0)
679 && (extctx & SSL_EXT_TLS1_2_AND_BELOW_ONLY) != 0)
681 && (extctx & SSL_EXT_TLS1_3_ONLY) != 0
682 && (thisctx & SSL_EXT_CLIENT_HELLO) == 0)
683 || ((extctx & SSL_EXT_TLS1_3_ONLY) != 0
684 && (thisctx & SSL_EXT_CLIENT_HELLO) != 0
685 && (SSL_IS_DTLS(s) || max_version < TLS1_3_VERSION)))
692 * Construct all the extensions relevant to the current |context| and write
693 * them to |pkt|. If this is an extension for a Certificate in a Certificate
694 * message, then |x| will be set to the Certificate we are handling, and
695 * |chainidx| will indicate the position in the chainidx we are processing (with
696 * 0 being the first in the chain). Returns 1 on success or 0 on failure. If a
697 * failure occurs then |al| is populated with a suitable alert code. On a
698 * failure construction stops at the first extension to fail to construct.
700 int tls_construct_extensions(SSL *s, WPACKET *pkt, unsigned int context,
701 X509 *x, size_t chainidx, int *al)
704 int min_version, max_version = 0, reason, tmpal;
705 const EXTENSION_DEFINITION *thisexd;
708 * Normally if something goes wrong during construction it's an internal
709 * error. We can always override this later.
711 tmpal = SSL_AD_INTERNAL_ERROR;
713 if (!WPACKET_start_sub_packet_u16(pkt)
715 * If extensions are of zero length then we don't even add the
716 * extensions length bytes to a ClientHello/ServerHello
720 (SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO)) != 0
721 && !WPACKET_set_flags(pkt,
722 WPACKET_FLAGS_ABANDON_ON_ZERO_LENGTH))) {
723 SSLerr(SSL_F_TLS_CONSTRUCT_EXTENSIONS, ERR_R_INTERNAL_ERROR);
727 if ((context & SSL_EXT_CLIENT_HELLO) != 0) {
728 reason = ssl_get_min_max_version(s, &min_version, &max_version);
730 SSLerr(SSL_F_TLS_CONSTRUCT_EXTENSIONS, reason);
735 /* Add custom extensions first */
736 if ((context & SSL_EXT_CLIENT_HELLO) != 0) {
737 /* On the server side with initialise during ClientHello parsing */
738 custom_ext_init(&s->cert->custext);
740 if (!custom_ext_add(s, context, pkt, x, chainidx, max_version, &tmpal)) {
741 SSLerr(SSL_F_TLS_CONSTRUCT_EXTENSIONS, ERR_R_INTERNAL_ERROR);
745 for (i = 0, thisexd = ext_defs; i < OSSL_NELEM(ext_defs); i++, thisexd++) {
746 EXT_RETURN (*construct)(SSL *s, WPACKET *pkt, unsigned int context,
747 X509 *x, size_t chainidx, int *al);
750 /* Skip if not relevant for our context */
751 if (!should_add_extension(s, thisexd->context, context, max_version))
754 construct = s->server ? thisexd->construct_stoc
755 : thisexd->construct_ctos;
757 if (construct == NULL)
760 ret = construct(s, pkt, context, x, chainidx, &tmpal);
761 if (ret == EXT_RETURN_FAIL)
763 if (ret == EXT_RETURN_SENT
764 && (context & (SSL_EXT_CLIENT_HELLO
765 | SSL_EXT_TLS1_3_CERTIFICATE_REQUEST
766 | SSL_EXT_TLS1_3_NEW_SESSION_TICKET)) != 0)
767 s->ext.extflags[i] |= SSL_EXT_FLAG_SENT;
770 if (!WPACKET_close(pkt)) {
771 SSLerr(SSL_F_TLS_CONSTRUCT_EXTENSIONS, ERR_R_INTERNAL_ERROR);
783 * Built in extension finalisation and initialisation functions. All initialise
784 * or finalise the associated extension type for the given |context|. For
785 * finalisers |sent| is set to 1 if we saw the extension during parsing, and 0
786 * otherwise. These functions return 1 on success or 0 on failure. In the event
787 * of a failure then |*al| is populated with a suitable error code.
790 static int final_renegotiate(SSL *s, unsigned int context, int sent,
795 * Check if we can connect to a server that doesn't support safe
798 if (!(s->options & SSL_OP_LEGACY_SERVER_CONNECT)
799 && !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION)
801 *al = SSL_AD_HANDSHAKE_FAILURE;
802 SSLerr(SSL_F_FINAL_RENEGOTIATE,
803 SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
810 /* Need RI if renegotiating */
812 && !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION)
814 *al = SSL_AD_HANDSHAKE_FAILURE;
815 SSLerr(SSL_F_FINAL_RENEGOTIATE,
816 SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
824 static int init_server_name(SSL *s, unsigned int context)
827 s->servername_done = 0;
832 static int final_server_name(SSL *s, unsigned int context, int sent,
835 int ret = SSL_TLSEXT_ERR_NOACK;
836 int altmp = SSL_AD_UNRECOGNIZED_NAME;
837 int was_ticket = (SSL_get_options(s) & SSL_OP_NO_TICKET) == 0;
839 if (s->ctx != NULL && s->ctx->ext.servername_cb != 0)
840 ret = s->ctx->ext.servername_cb(s, &altmp,
841 s->ctx->ext.servername_arg);
842 else if (s->session_ctx != NULL
843 && s->session_ctx->ext.servername_cb != 0)
844 ret = s->session_ctx->ext.servername_cb(s, &altmp,
845 s->session_ctx->ext.servername_arg);
848 OPENSSL_free(s->session->ext.hostname);
849 s->session->ext.hostname = NULL;
853 * If we're expecting to send a ticket, and tickets were previously enabled,
854 * and now tickets are disabled, then turn off expected ticket.
855 * Also, if this is not a resumption, create a new session ID
857 if (ret == SSL_TLSEXT_ERR_OK && s->ext.ticket_expected
858 && was_ticket && (SSL_get_options(s) & SSL_OP_NO_TICKET) != 0) {
859 s->ext.ticket_expected = 0;
861 SSL_SESSION* ss = SSL_get_session(s);
864 OPENSSL_free(ss->ext.tick);
867 ss->ext.tick_lifetime_hint = 0;
868 ss->ext.tick_age_add = 0;
869 ss->ext.tick_identity = 0;
870 if (!ssl_generate_session_id(s, ss)) {
871 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
872 altmp = SSL_AD_INTERNAL_ERROR;
875 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
876 altmp = SSL_AD_INTERNAL_ERROR;
882 case SSL_TLSEXT_ERR_ALERT_FATAL:
886 case SSL_TLSEXT_ERR_ALERT_WARNING:
890 case SSL_TLSEXT_ERR_NOACK:
891 s->servername_done = 0;
892 if (s->server && s->session->ext.hostname != NULL)
893 s->ext.early_data_ok = 0;
901 #ifndef OPENSSL_NO_EC
902 static int final_ec_pt_formats(SSL *s, unsigned int context, int sent,
905 unsigned long alg_k, alg_a;
910 alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
911 alg_a = s->s3->tmp.new_cipher->algorithm_auth;
914 * If we are client and using an elliptic curve cryptography cipher
915 * suite, then if server returns an EC point formats lists extension it
916 * must contain uncompressed.
918 if (s->ext.ecpointformats != NULL
919 && s->ext.ecpointformats_len > 0
920 && s->session->ext.ecpointformats != NULL
921 && s->session->ext.ecpointformats_len > 0
922 && ((alg_k & SSL_kECDHE) || (alg_a & SSL_aECDSA))) {
923 /* we are using an ECC cipher */
925 unsigned char *list = s->session->ext.ecpointformats;
927 for (i = 0; i < s->session->ext.ecpointformats_len; i++) {
928 if (*list++ == TLSEXT_ECPOINTFORMAT_uncompressed)
931 if (i == s->session->ext.ecpointformats_len) {
932 SSLerr(SSL_F_FINAL_EC_PT_FORMATS,
933 SSL_R_TLS_INVALID_ECPOINTFORMAT_LIST);
942 static int init_session_ticket(SSL *s, unsigned int context)
945 s->ext.ticket_expected = 0;
950 #ifndef OPENSSL_NO_OCSP
951 static int init_status_request(SSL *s, unsigned int context)
954 s->ext.status_type = TLSEXT_STATUSTYPE_nothing;
957 * Ensure we get sensible values passed to tlsext_status_cb in the event
958 * that we don't receive a status message
960 OPENSSL_free(s->ext.ocsp.resp);
961 s->ext.ocsp.resp = NULL;
962 s->ext.ocsp.resp_len = 0;
969 #ifndef OPENSSL_NO_NEXTPROTONEG
970 static int init_npn(SSL *s, unsigned int context)
978 static int init_alpn(SSL *s, unsigned int context)
980 OPENSSL_free(s->s3->alpn_selected);
981 s->s3->alpn_selected = NULL;
982 s->s3->alpn_selected_len = 0;
984 OPENSSL_free(s->s3->alpn_proposed);
985 s->s3->alpn_proposed = NULL;
986 s->s3->alpn_proposed_len = 0;
991 static int final_alpn(SSL *s, unsigned int context, int sent, int *al)
993 if (!s->server && !sent && s->session->ext.alpn_selected != NULL)
994 s->ext.early_data_ok = 0;
996 if (!s->server || !SSL_IS_TLS13(s))
1000 * Call alpn_select callback if needed. Has to be done after SNI and
1001 * cipher negotiation (HTTP/2 restricts permitted ciphers). In TLSv1.3
1002 * we also have to do this before we decide whether to accept early_data.
1003 * In TLSv1.3 we've already negotiated our cipher so we do this call now.
1004 * For < TLSv1.3 we defer it until after cipher negotiation.
1006 return tls_handle_alpn(s, al);
1009 static int init_sig_algs(SSL *s, unsigned int context)
1011 /* Clear any signature algorithms extension received */
1012 OPENSSL_free(s->s3->tmp.peer_sigalgs);
1013 s->s3->tmp.peer_sigalgs = NULL;
1018 #ifndef OPENSSL_NO_SRP
1019 static int init_srp(SSL *s, unsigned int context)
1021 OPENSSL_free(s->srp_ctx.login);
1022 s->srp_ctx.login = NULL;
1028 static int init_etm(SSL *s, unsigned int context)
1035 static int init_ems(SSL *s, unsigned int context)
1038 s->s3->flags &= ~TLS1_FLAGS_RECEIVED_EXTMS;
1043 static int final_ems(SSL *s, unsigned int context, int sent, int *al)
1045 if (!s->server && s->hit) {
1047 * Check extended master secret extension is consistent with
1050 if (!(s->s3->flags & TLS1_FLAGS_RECEIVED_EXTMS) !=
1051 !(s->session->flags & SSL_SESS_FLAG_EXTMS)) {
1052 *al = SSL_AD_HANDSHAKE_FAILURE;
1053 SSLerr(SSL_F_FINAL_EMS, SSL_R_INCONSISTENT_EXTMS);
1061 static int init_certificate_authorities(SSL *s, unsigned int context)
1063 sk_X509_NAME_pop_free(s->s3->tmp.peer_ca_names, X509_NAME_free);
1064 s->s3->tmp.peer_ca_names = NULL;
1068 static EXT_RETURN tls_construct_certificate_authorities(SSL *s, WPACKET *pkt,
1069 unsigned int context,
1074 const STACK_OF(X509_NAME) *ca_sk = SSL_get0_CA_list(s);
1076 if (ca_sk == NULL || sk_X509_NAME_num(ca_sk) == 0)
1077 return EXT_RETURN_NOT_SENT;
1079 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_certificate_authorities)
1080 || !WPACKET_start_sub_packet_u16(pkt)
1081 || !construct_ca_names(s, pkt)
1082 || !WPACKET_close(pkt)) {
1083 SSLerr(SSL_F_TLS_CONSTRUCT_CERTIFICATE_AUTHORITIES,
1084 ERR_R_INTERNAL_ERROR);
1085 return EXT_RETURN_FAIL;
1088 return EXT_RETURN_SENT;
1091 static int tls_parse_certificate_authorities(SSL *s, PACKET *pkt,
1092 unsigned int context, X509 *x,
1093 size_t chainidx, int *al)
1095 if (!parse_ca_names(s, pkt, al))
1097 if (PACKET_remaining(pkt) != 0) {
1098 *al = SSL_AD_DECODE_ERROR;
1104 #ifndef OPENSSL_NO_SRTP
1105 static int init_srtp(SSL *s, unsigned int context)
1108 s->srtp_profile = NULL;
1114 static int final_sig_algs(SSL *s, unsigned int context, int sent, int *al)
1116 if (!sent && SSL_IS_TLS13(s) && !s->hit) {
1117 *al = TLS13_AD_MISSING_EXTENSION;
1118 SSLerr(SSL_F_FINAL_SIG_ALGS, SSL_R_MISSING_SIGALGS_EXTENSION);
1125 #ifndef OPENSSL_NO_EC
1126 static int final_key_share(SSL *s, unsigned int context, int sent, int *al)
1128 if (!SSL_IS_TLS13(s))
1131 /* Nothing to do for key_share in an HRR */
1132 if ((context & SSL_EXT_TLS1_3_HELLO_RETRY_REQUEST) != 0)
1139 * we have no key_share
1141 * (we are not resuming
1142 * OR the kex_mode doesn't allow non key_share resumes)
1149 || (s->ext.psk_kex_mode & TLSEXT_KEX_MODE_FLAG_KE) == 0)) {
1150 /* Nothing left we can do - just fail */
1151 *al = SSL_AD_MISSING_EXTENSION;
1152 SSLerr(SSL_F_FINAL_KEY_SHARE, SSL_R_NO_SUITABLE_KEY_SHARE);
1159 * we have no key_share
1162 * we didn't already send a HelloRetryRequest
1164 * the client sent a key_share extension
1166 * (we are not resuming
1167 * OR the kex_mode allows key_share resumes)
1169 * a shared group exists
1171 * send a HelloRetryRequest
1173 * we are not resuming
1175 * the kex_mode doesn't allow non key_share resumes
1179 if (s->server && s->s3->peer_tmp == NULL) {
1180 /* No suitable share */
1181 if (s->hello_retry_request == 0 && sent
1183 || (s->ext.psk_kex_mode & TLSEXT_KEX_MODE_FLAG_KE_DHE)
1185 const uint16_t *pgroups, *clntgroups;
1186 size_t num_groups, clnt_num_groups, i;
1187 unsigned int group_id = 0;
1189 /* Check if a shared group exists */
1191 /* Get the clients list of supported groups. */
1192 tls1_get_peer_groups(s, &clntgroups, &clnt_num_groups);
1193 tls1_get_supported_groups(s, &pgroups, &num_groups);
1195 /* Find the first group we allow that is also in client's list */
1196 for (i = 0; i < num_groups; i++) {
1197 group_id = pgroups[i];
1199 if (check_in_list(s, group_id, clntgroups, clnt_num_groups, 1))
1203 if (i < num_groups) {
1204 /* A shared group exists so send a HelloRetryRequest */
1205 s->s3->group_id = group_id;
1206 s->hello_retry_request = 1;
1211 || (s->ext.psk_kex_mode & TLSEXT_KEX_MODE_FLAG_KE) == 0) {
1212 /* Nothing left we can do - just fail */
1214 *al = SSL_AD_MISSING_EXTENSION;
1216 *al = SSL_AD_HANDSHAKE_FAILURE;
1217 SSLerr(SSL_F_FINAL_KEY_SHARE, SSL_R_NO_SUITABLE_KEY_SHARE);
1222 /* We have a key_share so don't send any more HelloRetryRequest messages */
1224 s->hello_retry_request = 0;
1227 * For a client side resumption with no key_share we need to generate
1228 * the handshake secret (otherwise this is done during key_share
1231 if (!sent && !s->server && !tls13_generate_handshake_secret(s, NULL, 0)) {
1232 *al = SSL_AD_INTERNAL_ERROR;
1233 SSLerr(SSL_F_FINAL_KEY_SHARE, ERR_R_INTERNAL_ERROR);
1241 static int init_psk_kex_modes(SSL *s, unsigned int context)
1243 s->ext.psk_kex_mode = TLSEXT_KEX_MODE_FLAG_NONE;
1247 int tls_psk_do_binder(SSL *s, const EVP_MD *md, const unsigned char *msgstart,
1248 size_t binderoffset, const unsigned char *binderin,
1249 unsigned char *binderout, SSL_SESSION *sess, int sign,
1252 EVP_PKEY *mackey = NULL;
1253 EVP_MD_CTX *mctx = NULL;
1254 unsigned char hash[EVP_MAX_MD_SIZE], binderkey[EVP_MAX_MD_SIZE];
1255 unsigned char finishedkey[EVP_MAX_MD_SIZE], tmpbinder[EVP_MAX_MD_SIZE];
1256 unsigned char tmppsk[EVP_MAX_MD_SIZE];
1257 unsigned char *early_secret, *psk;
1258 const char resumption_label[] = "res binder";
1259 const char external_label[] = "ext binder";
1260 const char nonce_label[] = "resumption";
1262 size_t bindersize, labelsize, hashsize = EVP_MD_size(md);
1264 int usepskfored = 0;
1267 && s->early_data_state == SSL_EARLY_DATA_CONNECTING
1268 && s->session->ext.max_early_data == 0
1269 && sess->ext.max_early_data > 0)
1273 label = external_label;
1274 labelsize = sizeof(external_label) - 1;
1276 label = resumption_label;
1277 labelsize = sizeof(resumption_label) - 1;
1280 if (sess->master_key_length != hashsize) {
1281 SSLerr(SSL_F_TLS_PSK_DO_BINDER, SSL_R_BAD_PSK);
1286 psk = sess->master_key;
1289 if (!tls13_hkdf_expand(s, md, sess->master_key,
1290 (const unsigned char *)nonce_label,
1291 sizeof(nonce_label) - 1, sess->ext.tick_nonce,
1292 sess->ext.tick_nonce_len, psk, hashsize)) {
1293 SSLerr(SSL_F_TLS_PSK_DO_BINDER, ERR_R_INTERNAL_ERROR);
1299 * Generate the early_secret. On the server side we've selected a PSK to
1300 * resume with (internal or external) so we always do this. On the client
1301 * side we do this for a non-external (i.e. resumption) PSK or external PSK
1302 * that will be used for early_data so that it is in place for sending early
1303 * data. For client side external PSK not being used for early_data we
1304 * generate it but store it away for later use.
1306 if (s->server || !external || usepskfored)
1307 early_secret = (unsigned char *)s->early_secret;
1309 early_secret = (unsigned char *)sess->early_secret;
1310 if (!tls13_generate_secret(s, md, NULL, psk, hashsize, early_secret)) {
1311 SSLerr(SSL_F_TLS_PSK_DO_BINDER, ERR_R_INTERNAL_ERROR);
1316 * Create the handshake hash for the binder key...the messages so far are
1319 mctx = EVP_MD_CTX_new();
1321 || EVP_DigestInit_ex(mctx, md, NULL) <= 0
1322 || EVP_DigestFinal_ex(mctx, hash, NULL) <= 0) {
1323 SSLerr(SSL_F_TLS_PSK_DO_BINDER, ERR_R_INTERNAL_ERROR);
1327 /* Generate the binder key */
1328 if (!tls13_hkdf_expand(s, md, early_secret, (unsigned char *)label,
1329 labelsize, hash, hashsize, binderkey, hashsize)) {
1330 SSLerr(SSL_F_TLS_PSK_DO_BINDER, ERR_R_INTERNAL_ERROR);
1334 /* Generate the finished key */
1335 if (!tls13_derive_finishedkey(s, md, binderkey, finishedkey, hashsize)) {
1336 SSLerr(SSL_F_TLS_PSK_DO_BINDER, ERR_R_INTERNAL_ERROR);
1340 if (EVP_DigestInit_ex(mctx, md, NULL) <= 0) {
1341 SSLerr(SSL_F_TLS_PSK_DO_BINDER, ERR_R_INTERNAL_ERROR);
1346 * Get a hash of the ClientHello up to the start of the binders. If we are
1347 * following a HelloRetryRequest then this includes the hash of the first
1348 * ClientHello and the HelloRetryRequest itself.
1350 if (s->hello_retry_request) {
1354 hdatalen = BIO_get_mem_data(s->s3->handshake_buffer, &hdata);
1355 if (hdatalen <= 0) {
1356 SSLerr(SSL_F_TLS_PSK_DO_BINDER, SSL_R_BAD_HANDSHAKE_LENGTH);
1361 * For servers the handshake buffer data will include the second
1362 * ClientHello - which we don't want - so we need to take that bit off.
1365 PACKET hashprefix, msg;
1367 /* Find how many bytes are left after the first two messages */
1368 if (!PACKET_buf_init(&hashprefix, hdata, hdatalen)
1369 || !PACKET_forward(&hashprefix, 1)
1370 || !PACKET_get_length_prefixed_3(&hashprefix, &msg)
1371 || !PACKET_forward(&hashprefix, 1)
1372 || !PACKET_get_length_prefixed_3(&hashprefix, &msg)) {
1373 SSLerr(SSL_F_TLS_PSK_DO_BINDER, ERR_R_INTERNAL_ERROR);
1376 hdatalen -= PACKET_remaining(&hashprefix);
1379 if (EVP_DigestUpdate(mctx, hdata, hdatalen) <= 0) {
1380 SSLerr(SSL_F_TLS_PSK_DO_BINDER, ERR_R_INTERNAL_ERROR);
1385 if (EVP_DigestUpdate(mctx, msgstart, binderoffset) <= 0
1386 || EVP_DigestFinal_ex(mctx, hash, NULL) <= 0) {
1387 SSLerr(SSL_F_TLS_PSK_DO_BINDER, ERR_R_INTERNAL_ERROR);
1391 mackey = EVP_PKEY_new_mac_key(EVP_PKEY_HMAC, NULL, finishedkey, hashsize);
1392 if (mackey == NULL) {
1393 SSLerr(SSL_F_TLS_PSK_DO_BINDER, ERR_R_INTERNAL_ERROR);
1398 binderout = tmpbinder;
1400 bindersize = hashsize;
1401 if (EVP_DigestSignInit(mctx, NULL, md, NULL, mackey) <= 0
1402 || EVP_DigestSignUpdate(mctx, hash, hashsize) <= 0
1403 || EVP_DigestSignFinal(mctx, binderout, &bindersize) <= 0
1404 || bindersize != hashsize) {
1405 SSLerr(SSL_F_TLS_PSK_DO_BINDER, ERR_R_INTERNAL_ERROR);
1412 /* HMAC keys can't do EVP_DigestVerify* - use CRYPTO_memcmp instead */
1413 ret = (CRYPTO_memcmp(binderin, binderout, hashsize) == 0);
1417 OPENSSL_cleanse(binderkey, sizeof(binderkey));
1418 OPENSSL_cleanse(finishedkey, sizeof(finishedkey));
1419 EVP_PKEY_free(mackey);
1420 EVP_MD_CTX_free(mctx);
1425 static int final_early_data(SSL *s, unsigned int context, int sent, int *al)
1431 if (context == SSL_EXT_TLS1_3_ENCRYPTED_EXTENSIONS
1433 && !s->ext.early_data_ok) {
1435 * If we get here then the server accepted our early_data but we
1436 * later realised that it shouldn't have done (e.g. inconsistent
1439 *al = SSL_AD_ILLEGAL_PARAMETER;
1446 if (s->max_early_data == 0
1448 || s->session->ext.tick_identity != 0
1449 || s->early_data_state != SSL_EARLY_DATA_ACCEPTING
1450 || !s->ext.early_data_ok
1451 || s->hello_retry_request) {
1452 s->ext.early_data = SSL_EARLY_DATA_REJECTED;
1454 s->ext.early_data = SSL_EARLY_DATA_ACCEPTED;
1456 if (!tls13_change_cipher_state(s,
1457 SSL3_CC_EARLY | SSL3_CHANGE_CIPHER_SERVER_READ)) {
1458 *al = SSL_AD_INTERNAL_ERROR;