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 "internal/cryptlib.h"
13 #include "../ssl_locl.h"
14 #include "statem_locl.h"
16 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);
20 static int final_ec_pt_formats(SSL *s, unsigned int context, int sent);
22 static int init_session_ticket(SSL *s, unsigned int context);
23 #ifndef OPENSSL_NO_OCSP
24 static int init_status_request(SSL *s, unsigned int context);
26 #ifndef OPENSSL_NO_NEXTPROTONEG
27 static int init_npn(SSL *s, unsigned int context);
29 static int init_alpn(SSL *s, unsigned int context);
30 static int final_alpn(SSL *s, unsigned int context, int sent);
31 static int init_sig_algs(SSL *s, unsigned int context);
32 static int init_certificate_authorities(SSL *s, unsigned int context);
33 static EXT_RETURN tls_construct_certificate_authorities(SSL *s, WPACKET *pkt,
37 static int tls_parse_certificate_authorities(SSL *s, PACKET *pkt,
38 unsigned int context, X509 *x,
40 #ifndef OPENSSL_NO_SRP
41 static int init_srp(SSL *s, unsigned int context);
43 static int init_etm(SSL *s, unsigned int context);
44 static int init_ems(SSL *s, unsigned int context);
45 static int final_ems(SSL *s, unsigned int context, int sent);
46 static int init_psk_kex_modes(SSL *s, unsigned int context);
48 static int final_key_share(SSL *s, unsigned int context, int sent);
50 #ifndef OPENSSL_NO_SRTP
51 static int init_srtp(SSL *s, unsigned int context);
53 static int final_sig_algs(SSL *s, unsigned int context, int sent);
54 static int final_early_data(SSL *s, unsigned int context, int sent);
55 static int final_maxfragmentlen(SSL *s, unsigned int context, int sent);
57 /* Structure to define a built-in extension */
58 typedef struct extensions_definition_st {
59 /* The defined type for the extension */
62 * The context that this extension applies to, e.g. what messages and
67 * Initialise extension before parsing. Always called for relevant contexts
68 * even if extension not present
70 int (*init)(SSL *s, unsigned int context);
71 /* Parse extension sent from client to server */
72 int (*parse_ctos)(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
74 /* Parse extension send from server to client */
75 int (*parse_stoc)(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
77 /* Construct extension sent from server to client */
78 EXT_RETURN (*construct_stoc)(SSL *s, WPACKET *pkt, unsigned int context,
79 X509 *x, size_t chainidx);
80 /* Construct extension sent from client to server */
81 EXT_RETURN (*construct_ctos)(SSL *s, WPACKET *pkt, unsigned int context,
82 X509 *x, size_t chainidx);
84 * Finalise extension after parsing. Always called where an extensions was
85 * initialised even if the extension was not present. |sent| is set to 1 if
86 * the extension was seen, or 0 otherwise.
88 int (*final)(SSL *s, unsigned int context, int sent);
89 } EXTENSION_DEFINITION;
92 * Definitions of all built-in extensions. NOTE: Changes in the number or order
93 * of these extensions should be mirrored with equivalent changes to the
94 * indexes ( TLSEXT_IDX_* ) defined in ssl_locl.h.
95 * Each extension has an initialiser, a client and
96 * server side parser and a finaliser. The initialiser is called (if the
97 * extension is relevant to the given context) even if we did not see the
98 * extension in the message that we received. The parser functions are only
99 * called if we see the extension in the message. The finalisers are always
100 * called if the initialiser was called.
101 * There are also server and client side constructor functions which are always
102 * called during message construction if the extension is relevant for the
104 * The initialisation, parsing, finalisation and construction functions are
105 * always called in the order defined in this list. Some extensions may depend
106 * on others having been processed first, so the order of this list is
108 * The extension context is defined by a series of flags which specify which
109 * messages the extension is relevant to. These flags also specify whether the
110 * extension is relevant to a particular protocol or protocol version.
112 * TODO(TLS1.3): Make sure we have a test to check the consistency of these
114 * NOTE: WebSphere Application Server 7+ cannot handle empty extensions at
115 * the end, keep these extensions before signature_algorithm.
117 #define INVALID_EXTENSION { 0x10000, 0, NULL, NULL, NULL, NULL, NULL, NULL }
118 static const EXTENSION_DEFINITION ext_defs[] = {
120 TLSEXT_TYPE_renegotiate,
121 SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO
122 | SSL_EXT_SSL3_ALLOWED | SSL_EXT_TLS1_2_AND_BELOW_ONLY,
123 NULL, tls_parse_ctos_renegotiate, tls_parse_stoc_renegotiate,
124 tls_construct_stoc_renegotiate, tls_construct_ctos_renegotiate,
128 TLSEXT_TYPE_server_name,
129 SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO
130 | SSL_EXT_TLS1_3_ENCRYPTED_EXTENSIONS,
132 tls_parse_ctos_server_name, tls_parse_stoc_server_name,
133 tls_construct_stoc_server_name, tls_construct_ctos_server_name,
137 TLSEXT_TYPE_max_fragment_length,
138 SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO
139 | SSL_EXT_TLS1_3_ENCRYPTED_EXTENSIONS,
140 NULL, tls_parse_ctos_maxfragmentlen, tls_parse_stoc_maxfragmentlen,
141 tls_construct_stoc_maxfragmentlen, tls_construct_ctos_maxfragmentlen,
144 #ifndef OPENSSL_NO_SRP
147 SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_AND_BELOW_ONLY,
148 init_srp, tls_parse_ctos_srp, NULL, NULL, tls_construct_ctos_srp, NULL
153 #ifndef OPENSSL_NO_EC
155 TLSEXT_TYPE_ec_point_formats,
156 SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO
157 | SSL_EXT_TLS1_2_AND_BELOW_ONLY,
158 NULL, tls_parse_ctos_ec_pt_formats, tls_parse_stoc_ec_pt_formats,
159 tls_construct_stoc_ec_pt_formats, tls_construct_ctos_ec_pt_formats,
163 TLSEXT_TYPE_supported_groups,
164 SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_3_ENCRYPTED_EXTENSIONS,
165 NULL, tls_parse_ctos_supported_groups, NULL,
166 tls_construct_stoc_supported_groups,
167 tls_construct_ctos_supported_groups, NULL
174 TLSEXT_TYPE_session_ticket,
175 SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO
176 | SSL_EXT_TLS1_2_AND_BELOW_ONLY,
177 init_session_ticket, tls_parse_ctos_session_ticket,
178 tls_parse_stoc_session_ticket, tls_construct_stoc_session_ticket,
179 tls_construct_ctos_session_ticket, NULL
181 #ifndef OPENSSL_NO_OCSP
183 TLSEXT_TYPE_status_request,
184 SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO
185 | SSL_EXT_TLS1_3_CERTIFICATE,
186 init_status_request, tls_parse_ctos_status_request,
187 tls_parse_stoc_status_request, tls_construct_stoc_status_request,
188 tls_construct_ctos_status_request, NULL
193 #ifndef OPENSSL_NO_NEXTPROTONEG
195 TLSEXT_TYPE_next_proto_neg,
196 SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO
197 | SSL_EXT_TLS1_2_AND_BELOW_ONLY,
198 init_npn, tls_parse_ctos_npn, tls_parse_stoc_npn,
199 tls_construct_stoc_next_proto_neg, tls_construct_ctos_npn, NULL
206 * Must appear in this list after server_name so that finalisation
207 * happens after server_name callbacks
209 TLSEXT_TYPE_application_layer_protocol_negotiation,
210 SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO
211 | SSL_EXT_TLS1_3_ENCRYPTED_EXTENSIONS,
212 init_alpn, tls_parse_ctos_alpn, tls_parse_stoc_alpn,
213 tls_construct_stoc_alpn, tls_construct_ctos_alpn, final_alpn
215 #ifndef OPENSSL_NO_SRTP
217 TLSEXT_TYPE_use_srtp,
218 SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO
219 | SSL_EXT_TLS1_3_ENCRYPTED_EXTENSIONS | SSL_EXT_DTLS_ONLY,
220 init_srtp, tls_parse_ctos_use_srtp, tls_parse_stoc_use_srtp,
221 tls_construct_stoc_use_srtp, tls_construct_ctos_use_srtp, NULL
227 TLSEXT_TYPE_encrypt_then_mac,
228 SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO
229 | SSL_EXT_TLS1_2_AND_BELOW_ONLY,
230 init_etm, tls_parse_ctos_etm, tls_parse_stoc_etm,
231 tls_construct_stoc_etm, tls_construct_ctos_etm, NULL
233 #ifndef OPENSSL_NO_CT
235 TLSEXT_TYPE_signed_certificate_timestamp,
236 SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO
237 | SSL_EXT_TLS1_3_CERTIFICATE,
240 * No server side support for this, but can be provided by a custom
241 * extension. This is an exception to the rule that custom extensions
242 * cannot override built in ones.
244 NULL, tls_parse_stoc_sct, NULL, tls_construct_ctos_sct, NULL
250 TLSEXT_TYPE_extended_master_secret,
251 SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO
252 | SSL_EXT_TLS1_2_AND_BELOW_ONLY,
253 init_ems, tls_parse_ctos_ems, tls_parse_stoc_ems,
254 tls_construct_stoc_ems, tls_construct_ctos_ems, final_ems
257 TLSEXT_TYPE_signature_algorithms,
258 SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_3_CERTIFICATE_REQUEST,
259 init_sig_algs, tls_parse_ctos_sig_algs,
260 tls_parse_ctos_sig_algs, tls_construct_ctos_sig_algs,
261 tls_construct_ctos_sig_algs, final_sig_algs
264 TLSEXT_TYPE_supported_versions,
265 SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO
266 | SSL_EXT_TLS1_3_SERVER_HELLO | SSL_EXT_TLS_IMPLEMENTATION_ONLY,
268 /* Processed inline as part of version selection */
269 NULL, tls_parse_stoc_supported_versions,
270 tls_construct_stoc_supported_versions,
271 tls_construct_ctos_supported_versions, NULL
274 TLSEXT_TYPE_psk_kex_modes,
275 SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS_IMPLEMENTATION_ONLY
276 | SSL_EXT_TLS1_3_ONLY,
277 init_psk_kex_modes, tls_parse_ctos_psk_kex_modes, NULL, NULL,
278 tls_construct_ctos_psk_kex_modes, NULL
280 #ifndef OPENSSL_NO_EC
283 * Must be in this list after supported_groups. We need that to have
284 * been parsed before we do this one.
286 TLSEXT_TYPE_key_share,
287 SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_3_SERVER_HELLO
288 | SSL_EXT_TLS1_3_HELLO_RETRY_REQUEST | SSL_EXT_TLS_IMPLEMENTATION_ONLY
289 | SSL_EXT_TLS1_3_ONLY,
290 NULL, tls_parse_ctos_key_share, tls_parse_stoc_key_share,
291 tls_construct_stoc_key_share, tls_construct_ctos_key_share,
297 SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_3_HELLO_RETRY_REQUEST
298 | SSL_EXT_TLS_IMPLEMENTATION_ONLY | SSL_EXT_TLS1_3_ONLY,
299 NULL, NULL, tls_parse_stoc_cookie, NULL, tls_construct_ctos_cookie,
304 * Special unsolicited ServerHello extension only used when
305 * SSL_OP_CRYPTOPRO_TLSEXT_BUG is set
307 TLSEXT_TYPE_cryptopro_bug,
308 SSL_EXT_TLS1_2_SERVER_HELLO | SSL_EXT_TLS1_2_AND_BELOW_ONLY,
309 NULL, NULL, NULL, tls_construct_stoc_cryptopro_bug, NULL, NULL
312 TLSEXT_TYPE_early_data,
313 SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_3_ENCRYPTED_EXTENSIONS
314 | SSL_EXT_TLS1_3_NEW_SESSION_TICKET,
315 NULL, tls_parse_ctos_early_data, tls_parse_stoc_early_data,
316 tls_construct_stoc_early_data, tls_construct_ctos_early_data,
320 TLSEXT_TYPE_certificate_authorities,
321 SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_3_CERTIFICATE_REQUEST
322 | SSL_EXT_TLS1_3_ONLY,
323 init_certificate_authorities,
324 tls_parse_certificate_authorities, tls_parse_certificate_authorities,
325 tls_construct_certificate_authorities,
326 tls_construct_certificate_authorities, NULL,
329 /* Must be immediately before pre_shared_key */
331 SSL_EXT_CLIENT_HELLO,
333 /* We send this, but don't read it */
334 NULL, NULL, NULL, tls_construct_ctos_padding, NULL
337 /* Required by the TLSv1.3 spec to always be the last extension */
339 SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_3_SERVER_HELLO
340 | SSL_EXT_TLS_IMPLEMENTATION_ONLY | SSL_EXT_TLS1_3_ONLY,
341 NULL, tls_parse_ctos_psk, tls_parse_stoc_psk, tls_construct_stoc_psk,
342 tls_construct_ctos_psk, NULL
346 /* Check whether an extension's context matches the current context */
347 static int validate_context(SSL *s, unsigned int extctx, unsigned int thisctx)
349 /* Check we're allowed to use this extension in this context */
350 if ((thisctx & extctx) == 0)
353 if (SSL_IS_DTLS(s)) {
354 if ((extctx & SSL_EXT_TLS_ONLY) != 0)
356 } else if ((extctx & SSL_EXT_DTLS_ONLY) != 0) {
363 int tls_validate_all_contexts(SSL *s, unsigned int thisctx, RAW_EXTENSION *exts)
365 size_t i, num_exts, builtin_num = OSSL_NELEM(ext_defs), offset;
366 RAW_EXTENSION *thisext;
367 unsigned int context;
368 ENDPOINT role = ENDPOINT_BOTH;
370 if ((thisctx & SSL_EXT_CLIENT_HELLO) != 0)
371 role = ENDPOINT_SERVER;
372 else if ((thisctx & SSL_EXT_TLS1_2_SERVER_HELLO) != 0)
373 role = ENDPOINT_CLIENT;
375 /* Calculate the number of extensions in the extensions list */
376 num_exts = builtin_num + s->cert->custext.meths_count;
378 for (thisext = exts, i = 0; i < num_exts; i++, thisext++) {
379 if (!thisext->present)
382 if (i < builtin_num) {
383 context = ext_defs[i].context;
385 custom_ext_method *meth = NULL;
387 meth = custom_ext_find(&s->cert->custext, role, thisext->type,
389 if (!ossl_assert(meth != NULL))
391 context = meth->context;
394 if (!validate_context(s, context, thisctx))
402 * Verify whether we are allowed to use the extension |type| in the current
403 * |context|. Returns 1 to indicate the extension is allowed or unknown or 0 to
404 * indicate the extension is not allowed. If returning 1 then |*found| is set to
405 * the definition for the extension we found.
407 static int verify_extension(SSL *s, unsigned int context, unsigned int type,
408 custom_ext_methods *meths, RAW_EXTENSION *rawexlist,
409 RAW_EXTENSION **found)
412 size_t builtin_num = OSSL_NELEM(ext_defs);
413 const EXTENSION_DEFINITION *thisext;
415 for (i = 0, thisext = ext_defs; i < builtin_num; i++, thisext++) {
416 if (type == thisext->type) {
417 if (!validate_context(s, thisext->context, context))
420 *found = &rawexlist[i];
425 /* Check the custom extensions */
428 ENDPOINT role = ENDPOINT_BOTH;
429 custom_ext_method *meth = NULL;
431 if ((context & SSL_EXT_CLIENT_HELLO) != 0)
432 role = ENDPOINT_SERVER;
433 else if ((context & SSL_EXT_TLS1_2_SERVER_HELLO) != 0)
434 role = ENDPOINT_CLIENT;
436 meth = custom_ext_find(meths, role, type, &offset);
438 if (!validate_context(s, meth->context, context))
440 *found = &rawexlist[offset + builtin_num];
445 /* Unknown extension. We allow it */
451 * Check whether the context defined for an extension |extctx| means whether
452 * the extension is relevant for the current context |thisctx| or not. Returns
453 * 1 if the extension is relevant for this context, and 0 otherwise
455 int extension_is_relevant(SSL *s, unsigned int extctx, unsigned int thisctx)
460 * For HRR we haven't selected the version yet but we know it will be
463 if ((thisctx & SSL_EXT_TLS1_3_HELLO_RETRY_REQUEST) != 0)
466 is_tls13 = SSL_IS_TLS13(s);
469 && (extctx & SSL_EXT_TLS_IMPLEMENTATION_ONLY) != 0)
470 || (s->version == SSL3_VERSION
471 && (extctx & SSL_EXT_SSL3_ALLOWED) == 0)
472 || (is_tls13 && (extctx & SSL_EXT_TLS1_2_AND_BELOW_ONLY) != 0)
473 || (!is_tls13 && (extctx & SSL_EXT_TLS1_3_ONLY) != 0)
474 || (s->hit && (extctx & SSL_EXT_IGNORE_ON_RESUMPTION) != 0))
481 * Gather a list of all the extensions from the data in |packet]. |context|
482 * tells us which message this extension is for. The raw extension data is
483 * stored in |*res| on success. We don't actually process the content of the
484 * extensions yet, except to check their types. This function also runs the
485 * initialiser functions for all known extensions if |init| is nonzero (whether
486 * we have collected them or not). If successful the caller is responsible for
487 * freeing the contents of |*res|.
489 * Per http://tools.ietf.org/html/rfc5246#section-7.4.1.4, there may not be
490 * more than one extension of the same type in a ClientHello or ServerHello.
491 * This function returns 1 if all extensions are unique and we have parsed their
492 * types, and 0 if the extensions contain duplicates, could not be successfully
493 * found, or an internal error occurred. We only check duplicates for
494 * extensions that we know about. We ignore others.
496 int tls_collect_extensions(SSL *s, PACKET *packet, unsigned int context,
497 RAW_EXTENSION **res, size_t *len, int init)
499 PACKET extensions = *packet;
502 custom_ext_methods *exts = &s->cert->custext;
503 RAW_EXTENSION *raw_extensions = NULL;
504 const EXTENSION_DEFINITION *thisexd;
509 * Initialise server side custom extensions. Client side is done during
510 * construction of extensions for the ClientHello.
512 if ((context & SSL_EXT_CLIENT_HELLO) != 0)
513 custom_ext_init(&s->cert->custext);
515 num_exts = OSSL_NELEM(ext_defs) + (exts != NULL ? exts->meths_count : 0);
516 raw_extensions = OPENSSL_zalloc(num_exts * sizeof(*raw_extensions));
517 if (raw_extensions == NULL) {
518 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_COLLECT_EXTENSIONS,
519 ERR_R_MALLOC_FAILURE);
524 while (PACKET_remaining(&extensions) > 0) {
525 unsigned int type, idx;
527 RAW_EXTENSION *thisex;
529 if (!PACKET_get_net_2(&extensions, &type) ||
530 !PACKET_get_length_prefixed_2(&extensions, &extension)) {
531 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_COLLECT_EXTENSIONS,
532 SSL_R_BAD_EXTENSION);
536 * Verify this extension is allowed. We only check duplicates for
537 * extensions that we recognise. We also have a special case for the
538 * PSK extension, which must be the last one in the ClientHello.
540 if (!verify_extension(s, context, type, exts, raw_extensions, &thisex)
541 || (thisex != NULL && thisex->present == 1)
542 || (type == TLSEXT_TYPE_psk
543 && (context & SSL_EXT_CLIENT_HELLO) != 0
544 && PACKET_remaining(&extensions) != 0)) {
545 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_F_TLS_COLLECT_EXTENSIONS,
546 SSL_R_BAD_EXTENSION);
549 idx = thisex - raw_extensions;
551 * Check that we requested this extension (if appropriate). Requests can
552 * be sent in the ClientHello and CertificateRequest. Unsolicited
553 * extensions can be sent in the NewSessionTicket. We only do this for
554 * the built-in extensions. Custom extensions have a different but
555 * similar check elsewhere.
557 * - The HRR cookie extension is unsolicited
558 * - The renegotiate extension is unsolicited (the client signals
559 * support via an SCSV)
560 * - The signed_certificate_timestamp extension can be provided by a
561 * custom extension or by the built-in version. We let the extension
562 * itself handle unsolicited response checks.
564 if (idx < OSSL_NELEM(ext_defs)
565 && (context & (SSL_EXT_CLIENT_HELLO
566 | SSL_EXT_TLS1_3_CERTIFICATE_REQUEST
567 | SSL_EXT_TLS1_3_NEW_SESSION_TICKET)) == 0
568 && type != TLSEXT_TYPE_cookie
569 && type != TLSEXT_TYPE_renegotiate
570 && type != TLSEXT_TYPE_signed_certificate_timestamp
571 && (s->ext.extflags[idx] & SSL_EXT_FLAG_SENT) == 0) {
572 SSLfatal(s, SSL_AD_UNSUPPORTED_EXTENSION,
573 SSL_F_TLS_COLLECT_EXTENSIONS, SSL_R_UNSOLICITED_EXTENSION);
576 if (thisex != NULL) {
577 thisex->data = extension;
580 thisex->received_order = i++;
582 s->ext.debug_cb(s, !s->server, thisex->type,
583 PACKET_data(&thisex->data),
584 PACKET_remaining(&thisex->data),
591 * Initialise all known extensions relevant to this context,
592 * whether we have found them or not
594 for (thisexd = ext_defs, i = 0; i < OSSL_NELEM(ext_defs);
596 if (thisexd->init != NULL && (thisexd->context & context) != 0
597 && extension_is_relevant(s, thisexd->context, context)
598 && !thisexd->init(s, context)) {
599 /* SSLfatal() already called */
605 *res = raw_extensions;
611 OPENSSL_free(raw_extensions);
616 * Runs the parser for a given extension with index |idx|. |exts| contains the
617 * list of all parsed extensions previously collected by
618 * tls_collect_extensions(). The parser is only run if it is applicable for the
619 * given |context| and the parser has not already been run. If this is for a
620 * Certificate message, then we also provide the parser with the relevant
621 * Certificate |x| and its position in the |chainidx| with 0 being the first
622 * Certificate. Returns 1 on success or 0 on failure. If an extension is not
623 * present this counted as success.
625 int tls_parse_extension(SSL *s, TLSEXT_INDEX idx, int context,
626 RAW_EXTENSION *exts, X509 *x, size_t chainidx)
628 RAW_EXTENSION *currext = &exts[idx];
629 int (*parser)(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
630 size_t chainidx) = NULL;
632 /* Skip if the extension is not present */
633 if (!currext->present)
636 /* Skip if we've already parsed this extension */
642 if (idx < OSSL_NELEM(ext_defs)) {
643 /* We are handling a built-in extension */
644 const EXTENSION_DEFINITION *extdef = &ext_defs[idx];
646 /* Check if extension is defined for our protocol. If not, skip */
647 if (!extension_is_relevant(s, extdef->context, context))
650 parser = s->server ? extdef->parse_ctos : extdef->parse_stoc;
653 return parser(s, &currext->data, context, x, chainidx);
656 * If the parser is NULL we fall through to the custom extension
661 /* Parse custom extensions */
662 return custom_ext_parse(s, context, currext->type,
663 PACKET_data(&currext->data),
664 PACKET_remaining(&currext->data),
669 * Parse all remaining extensions that have not yet been parsed. Also calls the
670 * finalisation for all extensions at the end if |fin| is nonzero, whether we
671 * collected them or not. Returns 1 for success or 0 for failure. If we are
672 * working on a Certificate message then we also pass the Certificate |x| and
673 * its position in the |chainidx|, with 0 being the first certificate.
675 int tls_parse_all_extensions(SSL *s, int context, RAW_EXTENSION *exts, X509 *x,
676 size_t chainidx, int fin)
678 size_t i, numexts = OSSL_NELEM(ext_defs);
679 const EXTENSION_DEFINITION *thisexd;
681 /* Calculate the number of extensions in the extensions list */
682 numexts += s->cert->custext.meths_count;
684 /* Parse each extension in turn */
685 for (i = 0; i < numexts; i++) {
686 if (!tls_parse_extension(s, i, context, exts, x, chainidx)) {
687 /* SSLfatal() already called */
694 * Finalise all known extensions relevant to this context,
695 * whether we have found them or not
697 for (i = 0, thisexd = ext_defs; i < OSSL_NELEM(ext_defs);
699 if (thisexd->final != NULL && (thisexd->context & context) != 0
700 && !thisexd->final(s, context, exts[i].present)) {
701 /* SSLfatal() already called */
710 int should_add_extension(SSL *s, unsigned int extctx, unsigned int thisctx,
713 /* Skip if not relevant for our context */
714 if ((extctx & thisctx) == 0)
717 /* Check if this extension is defined for our protocol. If not, skip */
718 if ((SSL_IS_DTLS(s) && (extctx & SSL_EXT_TLS_IMPLEMENTATION_ONLY) != 0)
719 || (s->version == SSL3_VERSION
720 && (extctx & SSL_EXT_SSL3_ALLOWED) == 0)
722 && (extctx & SSL_EXT_TLS1_2_AND_BELOW_ONLY) != 0)
724 && (extctx & SSL_EXT_TLS1_3_ONLY) != 0
725 && (thisctx & SSL_EXT_CLIENT_HELLO) == 0)
726 || ((extctx & SSL_EXT_TLS1_3_ONLY) != 0
727 && (thisctx & SSL_EXT_CLIENT_HELLO) != 0
728 && (SSL_IS_DTLS(s) || max_version < TLS1_3_VERSION)))
735 * Construct all the extensions relevant to the current |context| and write
736 * them to |pkt|. If this is an extension for a Certificate in a Certificate
737 * message, then |x| will be set to the Certificate we are handling, and
738 * |chainidx| will indicate the position in the chainidx we are processing (with
739 * 0 being the first in the chain). Returns 1 on success or 0 on failure. On a
740 * failure construction stops at the first extension to fail to construct.
742 int tls_construct_extensions(SSL *s, WPACKET *pkt, unsigned int context,
743 X509 *x, size_t chainidx)
746 int min_version, max_version = 0, reason;
747 const EXTENSION_DEFINITION *thisexd;
749 if (!WPACKET_start_sub_packet_u16(pkt)
751 * If extensions are of zero length then we don't even add the
752 * extensions length bytes to a ClientHello/ServerHello
756 (SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO)) != 0
757 && !WPACKET_set_flags(pkt,
758 WPACKET_FLAGS_ABANDON_ON_ZERO_LENGTH))) {
759 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_EXTENSIONS,
760 ERR_R_INTERNAL_ERROR);
764 if ((context & SSL_EXT_CLIENT_HELLO) != 0) {
765 reason = ssl_get_min_max_version(s, &min_version, &max_version);
767 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_EXTENSIONS,
773 /* Add custom extensions first */
774 if ((context & SSL_EXT_CLIENT_HELLO) != 0) {
775 /* On the server side with initialise during ClientHello parsing */
776 custom_ext_init(&s->cert->custext);
778 if (!custom_ext_add(s, context, pkt, x, chainidx, max_version)) {
779 /* SSLfatal() already called */
783 for (i = 0, thisexd = ext_defs; i < OSSL_NELEM(ext_defs); i++, thisexd++) {
784 EXT_RETURN (*construct)(SSL *s, WPACKET *pkt, unsigned int context,
785 X509 *x, size_t chainidx);
788 /* Skip if not relevant for our context */
789 if (!should_add_extension(s, thisexd->context, context, max_version))
792 construct = s->server ? thisexd->construct_stoc
793 : thisexd->construct_ctos;
795 if (construct == NULL)
798 ret = construct(s, pkt, context, x, chainidx);
799 if (ret == EXT_RETURN_FAIL) {
800 /* SSLfatal() already called */
803 if (ret == EXT_RETURN_SENT
804 && (context & (SSL_EXT_CLIENT_HELLO
805 | SSL_EXT_TLS1_3_CERTIFICATE_REQUEST
806 | SSL_EXT_TLS1_3_NEW_SESSION_TICKET)) != 0)
807 s->ext.extflags[i] |= SSL_EXT_FLAG_SENT;
810 if (!WPACKET_close(pkt)) {
811 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_EXTENSIONS,
812 ERR_R_INTERNAL_ERROR);
820 * Built in extension finalisation and initialisation functions. All initialise
821 * or finalise the associated extension type for the given |context|. For
822 * finalisers |sent| is set to 1 if we saw the extension during parsing, and 0
823 * otherwise. These functions return 1 on success or 0 on failure.
826 static int final_renegotiate(SSL *s, unsigned int context, int sent)
830 * Check if we can connect to a server that doesn't support safe
833 if (!(s->options & SSL_OP_LEGACY_SERVER_CONNECT)
834 && !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION)
836 SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE, SSL_F_FINAL_RENEGOTIATE,
837 SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
844 /* Need RI if renegotiating */
846 && !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION)
848 SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE, SSL_F_FINAL_RENEGOTIATE,
849 SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
857 static int init_server_name(SSL *s, unsigned int context)
860 s->servername_done = 0;
865 static int final_server_name(SSL *s, unsigned int context, int sent)
867 int ret = SSL_TLSEXT_ERR_NOACK, discard;
868 int altmp = SSL_AD_UNRECOGNIZED_NAME;
869 int was_ticket = (SSL_get_options(s) & SSL_OP_NO_TICKET) == 0;
871 if (s->ctx != NULL && s->ctx->ext.servername_cb != 0)
872 ret = s->ctx->ext.servername_cb(s, &altmp,
873 s->ctx->ext.servername_arg);
874 else if (s->session_ctx != NULL
875 && s->session_ctx->ext.servername_cb != 0)
876 ret = s->session_ctx->ext.servername_cb(s, &altmp,
877 s->session_ctx->ext.servername_arg);
880 OPENSSL_free(s->session->ext.hostname);
881 s->session->ext.hostname = NULL;
885 * If we switched contexts (whether here or in the client_hello callback),
886 * move the sess_accept increment from the session_ctx to the new
887 * context, to avoid the confusing situation of having sess_accept_good
888 * exceed sess_accept (zero) for the new context.
890 if (SSL_IS_FIRST_HANDSHAKE(s) && s->ctx != s->session_ctx) {
891 CRYPTO_atomic_add(&s->ctx->stats.sess_accept, 1, &discard,
893 CRYPTO_atomic_add(&s->session_ctx->stats.sess_accept, -1, &discard,
894 s->session_ctx->lock);
898 * If we're expecting to send a ticket, and tickets were previously enabled,
899 * and now tickets are disabled, then turn off expected ticket.
900 * Also, if this is not a resumption, create a new session ID
902 if (ret == SSL_TLSEXT_ERR_OK && s->ext.ticket_expected
903 && was_ticket && (SSL_get_options(s) & SSL_OP_NO_TICKET) != 0) {
904 s->ext.ticket_expected = 0;
906 SSL_SESSION* ss = SSL_get_session(s);
909 OPENSSL_free(ss->ext.tick);
912 ss->ext.tick_lifetime_hint = 0;
913 ss->ext.tick_age_add = 0;
914 ss->ext.tick_identity = 0;
915 if (!ssl_generate_session_id(s, ss)) {
916 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_FINAL_SERVER_NAME,
917 ERR_R_INTERNAL_ERROR);
921 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_FINAL_SERVER_NAME,
922 ERR_R_INTERNAL_ERROR);
929 case SSL_TLSEXT_ERR_ALERT_FATAL:
930 SSLfatal(s, altmp, SSL_F_FINAL_SERVER_NAME, SSL_R_CALLBACK_FAILED);
933 case SSL_TLSEXT_ERR_ALERT_WARNING:
934 ssl3_send_alert(s, SSL3_AL_WARNING, altmp);
937 case SSL_TLSEXT_ERR_NOACK:
938 s->servername_done = 0;
946 #ifndef OPENSSL_NO_EC
947 static int final_ec_pt_formats(SSL *s, unsigned int context, int sent)
949 unsigned long alg_k, alg_a;
954 alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
955 alg_a = s->s3->tmp.new_cipher->algorithm_auth;
958 * If we are client and using an elliptic curve cryptography cipher
959 * suite, then if server returns an EC point formats lists extension it
960 * must contain uncompressed.
962 if (s->ext.ecpointformats != NULL
963 && s->ext.ecpointformats_len > 0
964 && s->session->ext.ecpointformats != NULL
965 && s->session->ext.ecpointformats_len > 0
966 && ((alg_k & SSL_kECDHE) || (alg_a & SSL_aECDSA))) {
967 /* we are using an ECC cipher */
969 unsigned char *list = s->session->ext.ecpointformats;
971 for (i = 0; i < s->session->ext.ecpointformats_len; i++) {
972 if (*list++ == TLSEXT_ECPOINTFORMAT_uncompressed)
975 if (i == s->session->ext.ecpointformats_len) {
976 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_F_FINAL_EC_PT_FORMATS,
977 SSL_R_TLS_INVALID_ECPOINTFORMAT_LIST);
986 static int init_session_ticket(SSL *s, unsigned int context)
989 s->ext.ticket_expected = 0;
994 #ifndef OPENSSL_NO_OCSP
995 static int init_status_request(SSL *s, unsigned int context)
998 s->ext.status_type = TLSEXT_STATUSTYPE_nothing;
1001 * Ensure we get sensible values passed to tlsext_status_cb in the event
1002 * that we don't receive a status message
1004 OPENSSL_free(s->ext.ocsp.resp);
1005 s->ext.ocsp.resp = NULL;
1006 s->ext.ocsp.resp_len = 0;
1013 #ifndef OPENSSL_NO_NEXTPROTONEG
1014 static int init_npn(SSL *s, unsigned int context)
1016 s->s3->npn_seen = 0;
1022 static int init_alpn(SSL *s, unsigned int context)
1024 OPENSSL_free(s->s3->alpn_selected);
1025 s->s3->alpn_selected = NULL;
1026 s->s3->alpn_selected_len = 0;
1028 OPENSSL_free(s->s3->alpn_proposed);
1029 s->s3->alpn_proposed = NULL;
1030 s->s3->alpn_proposed_len = 0;
1035 static int final_alpn(SSL *s, unsigned int context, int sent)
1037 if (!s->server && !sent && s->session->ext.alpn_selected != NULL)
1038 s->ext.early_data_ok = 0;
1040 if (!s->server || !SSL_IS_TLS13(s))
1044 * Call alpn_select callback if needed. Has to be done after SNI and
1045 * cipher negotiation (HTTP/2 restricts permitted ciphers). In TLSv1.3
1046 * we also have to do this before we decide whether to accept early_data.
1047 * In TLSv1.3 we've already negotiated our cipher so we do this call now.
1048 * For < TLSv1.3 we defer it until after cipher negotiation.
1050 * On failure SSLfatal() already called.
1052 return tls_handle_alpn(s);
1055 static int init_sig_algs(SSL *s, unsigned int context)
1057 /* Clear any signature algorithms extension received */
1058 OPENSSL_free(s->s3->tmp.peer_sigalgs);
1059 s->s3->tmp.peer_sigalgs = NULL;
1064 #ifndef OPENSSL_NO_SRP
1065 static int init_srp(SSL *s, unsigned int context)
1067 OPENSSL_free(s->srp_ctx.login);
1068 s->srp_ctx.login = NULL;
1074 static int init_etm(SSL *s, unsigned int context)
1081 static int init_ems(SSL *s, unsigned int context)
1084 s->s3->flags &= ~TLS1_FLAGS_RECEIVED_EXTMS;
1089 static int final_ems(SSL *s, unsigned int context, int sent)
1091 if (!s->server && s->hit) {
1093 * Check extended master secret extension is consistent with
1096 if (!(s->s3->flags & TLS1_FLAGS_RECEIVED_EXTMS) !=
1097 !(s->session->flags & SSL_SESS_FLAG_EXTMS)) {
1098 SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE, SSL_F_FINAL_EMS,
1099 SSL_R_INCONSISTENT_EXTMS);
1107 static int init_certificate_authorities(SSL *s, unsigned int context)
1109 sk_X509_NAME_pop_free(s->s3->tmp.peer_ca_names, X509_NAME_free);
1110 s->s3->tmp.peer_ca_names = NULL;
1114 static EXT_RETURN tls_construct_certificate_authorities(SSL *s, WPACKET *pkt,
1115 unsigned int context,
1119 const STACK_OF(X509_NAME) *ca_sk = SSL_get0_CA_list(s);
1121 if (ca_sk == NULL || sk_X509_NAME_num(ca_sk) == 0)
1122 return EXT_RETURN_NOT_SENT;
1124 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_certificate_authorities)
1125 || !WPACKET_start_sub_packet_u16(pkt)) {
1126 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
1127 SSL_F_TLS_CONSTRUCT_CERTIFICATE_AUTHORITIES,
1128 ERR_R_INTERNAL_ERROR);
1129 return EXT_RETURN_FAIL;
1132 if (!construct_ca_names(s, pkt)) {
1133 /* SSLfatal() already called */
1134 return EXT_RETURN_FAIL;
1137 if (!WPACKET_close(pkt)) {
1138 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
1139 SSL_F_TLS_CONSTRUCT_CERTIFICATE_AUTHORITIES,
1140 ERR_R_INTERNAL_ERROR);
1141 return EXT_RETURN_FAIL;
1144 return EXT_RETURN_SENT;
1147 static int tls_parse_certificate_authorities(SSL *s, PACKET *pkt,
1148 unsigned int context, X509 *x,
1151 if (!parse_ca_names(s, pkt))
1153 if (PACKET_remaining(pkt) != 0) {
1154 SSLfatal(s, SSL_AD_DECODE_ERROR,
1155 SSL_F_TLS_PARSE_CERTIFICATE_AUTHORITIES, SSL_R_BAD_EXTENSION);
1161 #ifndef OPENSSL_NO_SRTP
1162 static int init_srtp(SSL *s, unsigned int context)
1165 s->srtp_profile = NULL;
1171 static int final_sig_algs(SSL *s, unsigned int context, int sent)
1173 if (!sent && SSL_IS_TLS13(s) && !s->hit) {
1174 SSLfatal(s, TLS13_AD_MISSING_EXTENSION, SSL_F_FINAL_SIG_ALGS,
1175 SSL_R_MISSING_SIGALGS_EXTENSION);
1182 #ifndef OPENSSL_NO_EC
1183 static int final_key_share(SSL *s, unsigned int context, int sent)
1185 if (!SSL_IS_TLS13(s))
1188 /* Nothing to do for key_share in an HRR */
1189 if ((context & SSL_EXT_TLS1_3_HELLO_RETRY_REQUEST) != 0)
1196 * we have no key_share
1198 * (we are not resuming
1199 * OR the kex_mode doesn't allow non key_share resumes)
1206 || (s->ext.psk_kex_mode & TLSEXT_KEX_MODE_FLAG_KE) == 0)) {
1207 /* Nothing left we can do - just fail */
1208 SSLfatal(s, SSL_AD_MISSING_EXTENSION, SSL_F_FINAL_KEY_SHARE,
1209 SSL_R_NO_SUITABLE_KEY_SHARE);
1216 * we have no key_share
1219 * we didn't already send a HelloRetryRequest
1221 * the client sent a key_share extension
1223 * (we are not resuming
1224 * OR the kex_mode allows key_share resumes)
1226 * a shared group exists
1228 * send a HelloRetryRequest
1230 * we are not resuming
1232 * the kex_mode doesn't allow non key_share resumes
1236 if (s->server && s->s3->peer_tmp == NULL) {
1237 /* No suitable share */
1238 if (s->hello_retry_request == SSL_HRR_NONE && sent
1240 || (s->ext.psk_kex_mode & TLSEXT_KEX_MODE_FLAG_KE_DHE)
1242 const uint16_t *pgroups, *clntgroups;
1243 size_t num_groups, clnt_num_groups, i;
1244 unsigned int group_id = 0;
1246 /* Check if a shared group exists */
1248 /* Get the clients list of supported groups. */
1249 tls1_get_peer_groups(s, &clntgroups, &clnt_num_groups);
1250 tls1_get_supported_groups(s, &pgroups, &num_groups);
1252 /* Find the first group we allow that is also in client's list */
1253 for (i = 0; i < num_groups; i++) {
1254 group_id = pgroups[i];
1256 if (check_in_list(s, group_id, clntgroups, clnt_num_groups, 1))
1260 if (i < num_groups) {
1261 /* A shared group exists so send a HelloRetryRequest */
1262 s->s3->group_id = group_id;
1263 s->hello_retry_request = SSL_HRR_PENDING;
1268 || (s->ext.psk_kex_mode & TLSEXT_KEX_MODE_FLAG_KE) == 0) {
1269 /* Nothing left we can do - just fail */
1271 sent ? SSL_AD_HANDSHAKE_FAILURE : SSL_AD_MISSING_EXTENSION,
1272 SSL_F_FINAL_KEY_SHARE, SSL_R_NO_SUITABLE_KEY_SHARE);
1277 /* We have a key_share so don't send any more HelloRetryRequest messages */
1278 if (s->server && s->hello_retry_request == SSL_HRR_PENDING)
1279 s->hello_retry_request = SSL_HRR_COMPLETE;
1282 * For a client side resumption with no key_share we need to generate
1283 * the handshake secret (otherwise this is done during key_share
1286 if (!sent && !s->server && !tls13_generate_handshake_secret(s, NULL, 0)) {
1287 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_FINAL_KEY_SHARE,
1288 ERR_R_INTERNAL_ERROR);
1296 static int init_psk_kex_modes(SSL *s, unsigned int context)
1298 s->ext.psk_kex_mode = TLSEXT_KEX_MODE_FLAG_NONE;
1302 int tls_psk_do_binder(SSL *s, const EVP_MD *md, const unsigned char *msgstart,
1303 size_t binderoffset, const unsigned char *binderin,
1304 unsigned char *binderout, SSL_SESSION *sess, int sign,
1307 EVP_PKEY *mackey = NULL;
1308 EVP_MD_CTX *mctx = NULL;
1309 unsigned char hash[EVP_MAX_MD_SIZE], binderkey[EVP_MAX_MD_SIZE];
1310 unsigned char finishedkey[EVP_MAX_MD_SIZE], tmpbinder[EVP_MAX_MD_SIZE];
1311 unsigned char tmppsk[EVP_MAX_MD_SIZE];
1312 unsigned char *early_secret, *psk;
1313 const char resumption_label[] = "res binder";
1314 const char external_label[] = "ext binder";
1315 const char nonce_label[] = "resumption";
1317 size_t bindersize, labelsize, hashsize = EVP_MD_size(md);
1319 int usepskfored = 0;
1322 && s->early_data_state == SSL_EARLY_DATA_CONNECTING
1323 && s->session->ext.max_early_data == 0
1324 && sess->ext.max_early_data > 0)
1328 label = external_label;
1329 labelsize = sizeof(external_label) - 1;
1331 label = resumption_label;
1332 labelsize = sizeof(resumption_label) - 1;
1335 if (sess->master_key_length != hashsize) {
1336 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PSK_DO_BINDER,
1342 psk = sess->master_key;
1345 if (!tls13_hkdf_expand(s, md, sess->master_key,
1346 (const unsigned char *)nonce_label,
1347 sizeof(nonce_label) - 1, sess->ext.tick_nonce,
1348 sess->ext.tick_nonce_len, psk, hashsize)) {
1349 /* SSLfatal() already called */
1355 * Generate the early_secret. On the server side we've selected a PSK to
1356 * resume with (internal or external) so we always do this. On the client
1357 * side we do this for a non-external (i.e. resumption) PSK or external PSK
1358 * that will be used for early_data so that it is in place for sending early
1359 * data. For client side external PSK not being used for early_data we
1360 * generate it but store it away for later use.
1362 if (s->server || !external || usepskfored)
1363 early_secret = (unsigned char *)s->early_secret;
1365 early_secret = (unsigned char *)sess->early_secret;
1366 if (!tls13_generate_secret(s, md, NULL, psk, hashsize, early_secret)) {
1367 /* SSLfatal() already called */
1372 * Create the handshake hash for the binder key...the messages so far are
1375 mctx = EVP_MD_CTX_new();
1377 || EVP_DigestInit_ex(mctx, md, NULL) <= 0
1378 || EVP_DigestFinal_ex(mctx, hash, NULL) <= 0) {
1379 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PSK_DO_BINDER,
1380 ERR_R_INTERNAL_ERROR);
1384 /* Generate the binder key */
1385 if (!tls13_hkdf_expand(s, md, early_secret, (unsigned char *)label,
1386 labelsize, hash, hashsize, binderkey, hashsize)) {
1387 /* SSLfatal() already called */
1391 /* Generate the finished key */
1392 if (!tls13_derive_finishedkey(s, md, binderkey, finishedkey, hashsize)) {
1393 /* SSLfatal() already called */
1397 if (EVP_DigestInit_ex(mctx, md, NULL) <= 0) {
1398 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PSK_DO_BINDER,
1399 ERR_R_INTERNAL_ERROR);
1404 * Get a hash of the ClientHello up to the start of the binders. If we are
1405 * following a HelloRetryRequest then this includes the hash of the first
1406 * ClientHello and the HelloRetryRequest itself.
1408 if (s->hello_retry_request == SSL_HRR_PENDING) {
1412 hdatalen = BIO_get_mem_data(s->s3->handshake_buffer, &hdata);
1413 if (hdatalen <= 0) {
1414 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PSK_DO_BINDER,
1415 SSL_R_BAD_HANDSHAKE_LENGTH);
1420 * For servers the handshake buffer data will include the second
1421 * ClientHello - which we don't want - so we need to take that bit off.
1424 PACKET hashprefix, msg;
1426 /* Find how many bytes are left after the first two messages */
1427 if (!PACKET_buf_init(&hashprefix, hdata, hdatalen)
1428 || !PACKET_forward(&hashprefix, 1)
1429 || !PACKET_get_length_prefixed_3(&hashprefix, &msg)
1430 || !PACKET_forward(&hashprefix, 1)
1431 || !PACKET_get_length_prefixed_3(&hashprefix, &msg)) {
1432 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PSK_DO_BINDER,
1433 ERR_R_INTERNAL_ERROR);
1436 hdatalen -= PACKET_remaining(&hashprefix);
1439 if (EVP_DigestUpdate(mctx, hdata, hdatalen) <= 0) {
1440 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PSK_DO_BINDER,
1441 ERR_R_INTERNAL_ERROR);
1446 if (EVP_DigestUpdate(mctx, msgstart, binderoffset) <= 0
1447 || EVP_DigestFinal_ex(mctx, hash, NULL) <= 0) {
1448 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PSK_DO_BINDER,
1449 ERR_R_INTERNAL_ERROR);
1453 mackey = EVP_PKEY_new_mac_key(EVP_PKEY_HMAC, NULL, finishedkey, hashsize);
1454 if (mackey == NULL) {
1455 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PSK_DO_BINDER,
1456 ERR_R_INTERNAL_ERROR);
1461 binderout = tmpbinder;
1463 bindersize = hashsize;
1464 if (EVP_DigestSignInit(mctx, NULL, md, NULL, mackey) <= 0
1465 || EVP_DigestSignUpdate(mctx, hash, hashsize) <= 0
1466 || EVP_DigestSignFinal(mctx, binderout, &bindersize) <= 0
1467 || bindersize != hashsize) {
1468 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PSK_DO_BINDER,
1469 ERR_R_INTERNAL_ERROR);
1476 /* HMAC keys can't do EVP_DigestVerify* - use CRYPTO_memcmp instead */
1477 ret = (CRYPTO_memcmp(binderin, binderout, hashsize) == 0);
1479 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_F_TLS_PSK_DO_BINDER,
1480 SSL_R_BINDER_DOES_NOT_VERIFY);
1484 OPENSSL_cleanse(binderkey, sizeof(binderkey));
1485 OPENSSL_cleanse(finishedkey, sizeof(finishedkey));
1486 EVP_PKEY_free(mackey);
1487 EVP_MD_CTX_free(mctx);
1492 static int final_early_data(SSL *s, unsigned int context, int sent)
1498 if (context == SSL_EXT_TLS1_3_ENCRYPTED_EXTENSIONS
1500 && !s->ext.early_data_ok) {
1502 * If we get here then the server accepted our early_data but we
1503 * later realised that it shouldn't have done (e.g. inconsistent
1506 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_F_FINAL_EARLY_DATA,
1507 SSL_R_BAD_EARLY_DATA);
1514 if (s->max_early_data == 0
1516 || s->session->ext.tick_identity != 0
1517 || s->early_data_state != SSL_EARLY_DATA_ACCEPTING
1518 || !s->ext.early_data_ok
1519 || s->hello_retry_request != SSL_HRR_NONE) {
1520 s->ext.early_data = SSL_EARLY_DATA_REJECTED;
1522 s->ext.early_data = SSL_EARLY_DATA_ACCEPTED;
1524 if (!tls13_change_cipher_state(s,
1525 SSL3_CC_EARLY | SSL3_CHANGE_CIPHER_SERVER_READ)) {
1526 /* SSLfatal() already called */
1534 static int final_maxfragmentlen(SSL *s, unsigned int context, int sent)
1537 * Session resumption on server-side with MFL extension active
1538 * BUT MFL extension packet was not resent (i.e. sent == 0)
1540 if (s->server && s->hit && USE_MAX_FRAGMENT_LENGTH_EXT(s->session)
1542 SSLfatal(s, SSL_AD_MISSING_EXTENSION, SSL_F_FINAL_MAXFRAGMENTLEN,
1543 SSL_R_BAD_EXTENSION);
1547 /* Current SSL buffer is lower than requested MFL */
1548 if (s->session && USE_MAX_FRAGMENT_LENGTH_EXT(s->session)
1549 && s->max_send_fragment < GET_MAX_FRAGMENT_LENGTH(s->session))
1550 /* trigger a larger buffer reallocation */
1551 if (!ssl3_setup_buffers(s)) {
1552 /* SSLfatal() already called */