2 * Copyright 2016 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the OpenSSL license (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
10 #include "../ssl_locl.h"
11 #include "statem_locl.h"
13 static int final_renegotiate(SSL *s, unsigned int context, int sent,
15 static int init_server_name(SSL *s, unsigned int context);
16 static int final_server_name(SSL *s, unsigned int context, int sent,
19 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, int *al);
31 static int init_sig_algs(SSL *s, unsigned int context);
32 #ifndef OPENSSL_NO_SRP
33 static int init_srp(SSL *s, unsigned int context);
35 static int init_etm(SSL *s, unsigned int context);
36 static int init_ems(SSL *s, unsigned int context);
37 static int final_ems(SSL *s, unsigned int context, int sent, int *al);
38 #ifndef OPENSSL_NO_SRTP
39 static int init_srtp(SSL *s, unsigned int context);
42 /* Structure to define a built-in extension */
43 typedef struct extensions_definition_st {
44 /* The defined type for the extension */
47 * The context that this extension applies to, e.g. what messages and
52 * Initialise extension before parsing. Always called for relevant contexts
53 * even if extension not present
55 int (*init)(SSL *s, unsigned int context);
56 /* Parse extension sent from client to server */
57 int (*parse_ctos)(SSL *s, PACKET *pkt, X509 *x, size_t chain, int *al);
58 /* Parse extension send from server to client */
59 int (*parse_stoc)(SSL *s, PACKET *pkt, X509 *x, size_t chain, int *al);
60 /* Construct extension sent from server to client */
61 int (*construct_stoc)(SSL *s, WPACKET *pkt, X509 *x, size_t chain,
63 /* Construct extension sent from client to server */
64 int (*construct_ctos)(SSL *s, WPACKET *pkt, X509 *x, size_t chain, int *al);
66 * Finalise extension after parsing. Always called where an extensions was
67 * initialised even if the extension was not present. |sent| is set to 1 if
68 * the extension was seen, or 0 otherwise.
70 int (*final)(SSL *s, unsigned int context, int sent, int *al);
71 } EXTENSION_DEFINITION;
74 * Definitions of all built-in extensions. NOTE: Changes in the number or order
75 * of these extensions should be mirrored with equivalent changes to the indexes
76 * defined in statem_locl.h.
77 * Each extension has an initialiser, a client and
78 * server side parser and a finaliser. The initialiser is called (if the
79 * extension is relevant to the given context) even if we did not see the
80 * extension in the message that we received. The parser functions are only
81 * called if we see the extension in the message. The finalisers are always
82 * called if the initialiser was called.
83 * There are also server and client side constructor functions which are always
84 * called during message construction if the extension is relevant for the
86 * The initialisation, parsing, finalisation and construction functions are
87 * always called in the order defined in this list. Some extensions may depend
88 * on others having been processed first, so the order of this list is
90 * The extension context is defined by a series of flags which specify which
91 * messages the extension is relevant to. These flags also specify whether the
92 * extension is relevant to a paricular protocol or protocol version.
94 * TODO(TLS1.3): Make sure we have a test to check the consistency of these
96 #define INVALID_EXTENSION { 0x10000, 0, NULL, NULL, NULL, NULL, NULL, NULL }
97 static const EXTENSION_DEFINITION ext_defs[] = {
99 TLSEXT_TYPE_renegotiate,
100 EXT_CLIENT_HELLO | EXT_TLS1_2_SERVER_HELLO | EXT_SSL3_ALLOWED
101 | EXT_TLS1_2_AND_BELOW_ONLY,
102 NULL, tls_parse_ctos_renegotiate, tls_parse_stoc_renegotiate,
103 tls_construct_stoc_renegotiate, tls_construct_ctos_renegotiate,
107 TLSEXT_TYPE_server_name,
108 EXT_CLIENT_HELLO | EXT_TLS1_2_SERVER_HELLO
109 | EXT_TLS1_3_ENCRYPTED_EXTENSIONS,
111 tls_parse_ctos_server_name, tls_parse_stoc_server_name,
112 tls_construct_stoc_server_name, tls_construct_ctos_server_name,
115 #ifndef OPENSSL_NO_SRP
118 EXT_CLIENT_HELLO | EXT_TLS1_2_AND_BELOW_ONLY,
119 init_srp, tls_parse_ctos_srp, NULL, NULL, tls_construct_ctos_srp, NULL
124 #ifndef OPENSSL_NO_EC
126 TLSEXT_TYPE_ec_point_formats,
127 EXT_CLIENT_HELLO | EXT_TLS1_2_SERVER_HELLO | EXT_TLS1_2_AND_BELOW_ONLY,
128 NULL, tls_parse_ctos_ec_pt_formats, tls_parse_stoc_ec_pt_formats,
129 tls_construct_stoc_ec_pt_formats, tls_construct_ctos_ec_pt_formats,
133 TLSEXT_TYPE_supported_groups,
134 EXT_CLIENT_HELLO | EXT_TLS1_3_ENCRYPTED_EXTENSIONS,
135 NULL, tls_parse_ctos_supported_groups, NULL,
136 NULL /* TODO(TLS1.3): Need to add this */,
137 tls_construct_ctos_supported_groups, NULL
144 TLSEXT_TYPE_session_ticket,
145 EXT_CLIENT_HELLO | EXT_TLS1_2_SERVER_HELLO | EXT_TLS1_2_AND_BELOW_ONLY,
146 init_session_ticket, tls_parse_ctos_session_ticket,
147 tls_parse_stoc_session_ticket, tls_construct_stoc_session_ticket,
148 tls_construct_ctos_session_ticket, NULL
151 TLSEXT_TYPE_signature_algorithms,
153 init_sig_algs, tls_parse_ctos_sig_algs, NULL, NULL,
154 tls_construct_ctos_sig_algs, NULL
156 #ifndef OPENSSL_NO_OCSP
158 TLSEXT_TYPE_status_request,
159 EXT_CLIENT_HELLO | EXT_TLS1_2_SERVER_HELLO
160 | EXT_TLS1_3_CERTIFICATE,
161 init_status_request, tls_parse_ctos_status_request,
162 tls_parse_stoc_status_request, tls_construct_stoc_status_request,
163 tls_construct_ctos_status_request, NULL
168 #ifndef OPENSSL_NO_NEXTPROTONEG
170 TLSEXT_TYPE_next_proto_neg,
171 EXT_CLIENT_HELLO | EXT_TLS1_2_SERVER_HELLO | EXT_TLS1_2_AND_BELOW_ONLY,
172 init_npn, tls_parse_ctos_npn, tls_parse_stoc_npn,
173 tls_construct_stoc_next_proto_neg, tls_construct_ctos_npn, NULL
180 * Must appear in this list after server_name so that finalisation
181 * happens after server_name callbacks
183 TLSEXT_TYPE_application_layer_protocol_negotiation,
184 EXT_CLIENT_HELLO | EXT_TLS1_2_SERVER_HELLO
185 | EXT_TLS1_3_ENCRYPTED_EXTENSIONS,
186 init_alpn, tls_parse_ctos_alpn, tls_parse_stoc_alpn,
187 tls_construct_stoc_alpn, tls_construct_ctos_alpn, final_alpn
189 #ifndef OPENSSL_NO_SRTP
191 TLSEXT_TYPE_use_srtp,
192 EXT_CLIENT_HELLO | EXT_TLS1_2_SERVER_HELLO
193 | EXT_TLS1_3_ENCRYPTED_EXTENSIONS | EXT_DTLS_ONLY,
194 init_srtp, tls_parse_ctos_use_srtp, tls_parse_stoc_use_srtp,
195 tls_construct_stoc_use_srtp, tls_construct_ctos_use_srtp, NULL
201 TLSEXT_TYPE_encrypt_then_mac,
202 EXT_CLIENT_HELLO | EXT_TLS1_2_SERVER_HELLO | EXT_TLS1_2_AND_BELOW_ONLY,
203 init_etm, tls_parse_ctos_etm, tls_parse_stoc_etm,
204 tls_construct_stoc_etm, tls_construct_ctos_etm, NULL
206 #ifndef OPENSSL_NO_CT
208 TLSEXT_TYPE_signed_certificate_timestamp,
209 EXT_CLIENT_HELLO | EXT_TLS1_2_SERVER_HELLO
210 | EXT_TLS1_3_CERTIFICATE,
213 * No server side support for this, but can be provided by a custom
214 * extension. This is an exception to the rule that custom extensions
215 * cannot override built in ones.
217 NULL, tls_parse_stoc_sct, NULL, tls_construct_ctos_sct, NULL
223 TLSEXT_TYPE_extended_master_secret,
224 EXT_CLIENT_HELLO | EXT_TLS1_2_SERVER_HELLO | EXT_TLS1_2_AND_BELOW_ONLY,
225 init_ems, tls_parse_ctos_ems, tls_parse_stoc_ems,
226 tls_construct_stoc_ems, tls_construct_ctos_ems, final_ems
229 TLSEXT_TYPE_supported_versions,
230 EXT_CLIENT_HELLO | EXT_TLS_IMPLEMENTATION_ONLY | EXT_TLS1_3_ONLY,
232 /* Processed inline as part of version selection */
233 NULL, NULL, NULL, tls_construct_ctos_supported_versions, NULL
237 * Must be in this list after supported_groups. We need that to have
238 * been parsed before we do this one.
240 TLSEXT_TYPE_key_share,
241 EXT_CLIENT_HELLO | EXT_TLS1_3_SERVER_HELLO
242 | EXT_TLS1_3_HELLO_RETRY_REQUEST | EXT_TLS_IMPLEMENTATION_ONLY
244 NULL, tls_parse_ctos_key_share, tls_parse_stoc_key_share,
245 tls_construct_stoc_key_share, tls_construct_ctos_key_share, NULL
249 * Special unsolicited ServerHello extension only used when
250 * SSL_OP_CRYPTOPRO_TLSEXT_BUG is set
252 TLSEXT_TYPE_cryptopro_bug,
253 EXT_TLS1_2_SERVER_HELLO | EXT_TLS1_2_AND_BELOW_ONLY,
254 NULL, NULL, NULL, tls_construct_stoc_cryptopro_bug, NULL, NULL
257 /* Last in the list because it must be added as the last extension */
261 /* We send this, but don't read it */
262 NULL, NULL, NULL, tls_construct_ctos_padding, NULL
267 * Verify whether we are allowed to use the extension |type| in the current
268 * |context|. Returns 1 to indicate the extension is allowed or unknown or 0 to
269 * indicate the extension is not allowed. If returning 1 then |*found| is set to
270 * 1 if we found a definition for the extension, and |*idx| is set to its index
272 static int verify_extension(SSL *s, unsigned int context, unsigned int type,
273 custom_ext_methods *meths, RAW_EXTENSION *rawexlist,
274 RAW_EXTENSION **found)
277 size_t builtin_num = OSSL_NELEM(ext_defs);
278 const EXTENSION_DEFINITION *thisext;
280 for (i = 0, thisext = ext_defs; i < builtin_num; i++, thisext++) {
281 if (type == thisext->type) {
282 /* Check we're allowed to use this extension in this context */
283 if ((context & thisext->context) == 0)
286 if (SSL_IS_DTLS(s)) {
287 if ((thisext->context & EXT_TLS_ONLY) != 0)
289 } else if ((thisext->context & EXT_DTLS_ONLY) != 0) {
293 *found = &rawexlist[i];
298 if ((context & (EXT_CLIENT_HELLO | EXT_TLS1_2_SERVER_HELLO)) == 0) {
300 * Custom extensions only apply to <=TLS1.2. This extension is unknown
301 * in this context - we allow it
307 /* Check the custom extensions */
309 for (i = builtin_num; i < builtin_num + meths->meths_count; i++) {
310 if (meths->meths[i - builtin_num].ext_type == type) {
311 *found = &rawexlist[i];
317 /* Unknown extension. We allow it */
323 * Check whether the context defined for an extension |extctx| means whether
324 * the extension is relevant for the current context |thisctx| or not. Returns
325 * 1 if the extension is relevant for this context, and 0 otherwise
327 static int extension_is_relevant(SSL *s, unsigned int extctx,
328 unsigned int thisctx)
331 && (extctx & EXT_TLS_IMPLEMENTATION_ONLY) != 0)
332 || (s->version == SSL3_VERSION
333 && (extctx & EXT_SSL3_ALLOWED) == 0)
335 && (extctx & EXT_TLS1_2_AND_BELOW_ONLY) != 0)
336 || (!SSL_IS_TLS13(s) && (extctx & EXT_TLS1_3_ONLY) != 0))
343 * Gather a list of all the extensions from the data in |packet]. |context|
344 * tells us which message this extension is for. The raw extension data is
345 * stored in |*res| on success. In the event of an error the alert type to use
346 * is stored in |*al|. We don't actually process the content of the extensions
347 * yet, except to check their types. This function also runs the initialiser
348 * functions for all known extensions (whether we have collected them or not).
349 * If successful the caller is responsible for freeing the contents of |*res|.
351 * Per http://tools.ietf.org/html/rfc5246#section-7.4.1.4, there may not be
352 * more than one extension of the same type in a ClientHello or ServerHello.
353 * This function returns 1 if all extensions are unique and we have parsed their
354 * types, and 0 if the extensions contain duplicates, could not be successfully
355 * found, or an internal error occurred. We only check duplicates for
356 * extensions that we know about. We ignore others.
358 int tls_collect_extensions(SSL *s, PACKET *packet, unsigned int context,
359 RAW_EXTENSION **res, int *al)
361 PACKET extensions = *packet;
363 custom_ext_methods *exts = NULL;
364 RAW_EXTENSION *raw_extensions = NULL;
365 const EXTENSION_DEFINITION *thisexd;
370 * Initialise server side custom extensions. Client side is done during
371 * construction of extensions for the ClientHello.
373 if ((context & EXT_CLIENT_HELLO) != 0) {
374 exts = &s->cert->srv_ext;
375 custom_ext_init(&s->cert->srv_ext);
376 } else if ((context & EXT_TLS1_2_SERVER_HELLO) != 0) {
377 exts = &s->cert->cli_ext;
380 raw_extensions = OPENSSL_zalloc((OSSL_NELEM(ext_defs)
381 + (exts != NULL ? exts->meths_count : 0))
382 * sizeof(*raw_extensions));
383 if (raw_extensions == NULL) {
384 *al = SSL_AD_INTERNAL_ERROR;
385 SSLerr(SSL_F_TLS_COLLECT_EXTENSIONS, ERR_R_MALLOC_FAILURE);
389 while (PACKET_remaining(&extensions) > 0) {
392 RAW_EXTENSION *thisex;
394 if (!PACKET_get_net_2(&extensions, &type) ||
395 !PACKET_get_length_prefixed_2(&extensions, &extension)) {
396 SSLerr(SSL_F_TLS_COLLECT_EXTENSIONS, SSL_R_BAD_EXTENSION);
397 *al = SSL_AD_DECODE_ERROR;
401 * Verify this extension is allowed. We only check duplicates for
402 * extensions that we recognise.
404 if (!verify_extension(s, context, type, exts, raw_extensions, &thisex)
405 || (thisex != NULL && thisex->present == 1)) {
406 SSLerr(SSL_F_TLS_COLLECT_EXTENSIONS, SSL_R_BAD_EXTENSION);
407 *al = SSL_AD_ILLEGAL_PARAMETER;
410 if (thisex != NULL) {
411 thisex->data = extension;
418 * Initialise all known extensions relevant to this context, whether we have
421 for (thisexd = ext_defs, i = 0; i < OSSL_NELEM(ext_defs); i++, thisexd++) {
422 if(thisexd->init != NULL && (thisexd->context & context) != 0
423 && extension_is_relevant(s, thisexd->context, context)
424 && !thisexd->init(s, context)) {
425 *al = SSL_AD_INTERNAL_ERROR;
430 *res = raw_extensions;
434 OPENSSL_free(raw_extensions);
439 * Runs the parser for a given extension with index |idx|. |exts| contains the
440 * list of all parsed extensions previously collected by
441 * tls_collect_extensions(). The parser is only run if it is applicable for the
442 * given |context| and the parser has not already been run. If this is for a
443 * Certificate message, then we also provide the parser with the relevant
444 * Certificate |x| and its position in the |chain| with 0 being the first
445 * Certificate. Returns 1 on success or 0 on failure. In the event of a failure
446 * |*al| is populated with a suitable alert code. If an extension is not present
447 * this counted as success.
449 int tls_parse_extension(SSL *s, TLSEXT_INDEX idx, int context,
450 RAW_EXTENSION *exts, X509 *x, size_t chain, int *al)
452 RAW_EXTENSION *currext = &exts[idx];
453 int (*parser)(SSL *s, PACKET *pkt, X509 *x, size_t chain, int *al) = NULL;
455 /* Skip if the extension is not present */
456 if (!currext->present)
459 if (s->tlsext_debug_cb)
460 s->tlsext_debug_cb(s, !s->server, currext->type,
461 PACKET_data(&currext->data),
462 PACKET_remaining(&currext->data),
463 s->tlsext_debug_arg);
465 /* Skip if we've already parsed this extension */
471 if (idx < OSSL_NELEM(ext_defs)) {
472 /* We are handling a built-in extension */
473 const EXTENSION_DEFINITION *extdef = &ext_defs[idx];
475 /* Check if extension is defined for our protocol. If not, skip */
476 if (!extension_is_relevant(s, extdef->context, context))
479 parser = s->server ? extdef->parse_ctos : extdef->parse_stoc;
482 return parser(s, &currext->data, x, chain, al);
485 * If the parser is NULL we fall through to the custom extension
491 * This is a custom extension. We only allow this if it is a non
492 * resumed session on the server side.
494 * TODO(TLS1.3): We only allow old style <=TLS1.2 custom extensions.
495 * We're going to need a new mechanism for TLS1.3 to specify which
496 * messages to add the custom extensions to.
498 if ((!s->hit || !s->server)
500 & (EXT_CLIENT_HELLO | EXT_TLS1_2_SERVER_HELLO)) != 0
501 && custom_ext_parse(s, s->server, currext->type,
502 PACKET_data(&currext->data),
503 PACKET_remaining(&currext->data),
511 * Parse all remaining extensions that have not yet been parsed. Also calls the
512 * finalisation for all extensions at the end, whether we collected them or not.
513 * Returns 1 for success or 0 for failure. If we are working on a Certificate
514 * message then we also pass the Certificate |x| and its position in the
515 * |chain|, with 0 being the first certificate. On failure, |*al| is populated
516 * with a suitable alert code.
518 int tls_parse_all_extensions(SSL *s, int context, RAW_EXTENSION *exts, X509 *x,
519 size_t chain, int *al)
521 size_t i, numexts = OSSL_NELEM(ext_defs);
522 const EXTENSION_DEFINITION *thisexd;
524 /* Calculate the number of extensions in the extensions list */
525 if ((context & EXT_CLIENT_HELLO) != 0) {
526 numexts += s->cert->srv_ext.meths_count;
527 } else if ((context & EXT_TLS1_2_SERVER_HELLO) != 0) {
528 numexts += s->cert->cli_ext.meths_count;
531 /* Parse each extension in turn */
532 for (i = 0; i < numexts; i++) {
533 if (!tls_parse_extension(s, i, context, exts, x, chain, al))
538 * Finalise all known extensions relevant to this context, whether we have
541 for (i = 0, thisexd = ext_defs; i < OSSL_NELEM(ext_defs); i++, thisexd++) {
542 if(thisexd->final != NULL
543 && (thisexd->context & context) != 0
544 && !thisexd->final(s, context, exts[i].present, al))
552 * Construct all the extensions relevant to the current |context| and write
553 * them to |pkt|. If this is an extension for a Certificate in a Certificate
554 * message, then |x| will be set to the Certificate we are handling, and |chain|
555 * will indicate the position in the chain we are processing (with 0 being the
556 * first in the chain). Returns 1 on success or 0 on failure. If a failure
557 * occurs then |al| is populated with a suitable alert code. On a failure
558 * construction stops at the first extension to fail to construct.
560 int tls_construct_extensions(SSL *s, WPACKET *pkt, unsigned int context,
561 X509 *x, size_t chain, int *al)
564 int addcustom = 0, min_version, max_version = 0, reason, tmpal;
565 const EXTENSION_DEFINITION *thisexd;
568 * Normally if something goes wrong during construction it's an internal
569 * error. We can always override this later.
571 tmpal = SSL_AD_INTERNAL_ERROR;
573 if (!WPACKET_start_sub_packet_u16(pkt)
575 * If extensions are of zero length then we don't even add the
576 * extensions length bytes to a ClientHello/ServerHello in SSLv3
578 || ((context & (EXT_CLIENT_HELLO | EXT_TLS1_2_SERVER_HELLO)) != 0
579 && s->version == SSL3_VERSION
580 && !WPACKET_set_flags(pkt,
581 WPACKET_FLAGS_ABANDON_ON_ZERO_LENGTH))) {
582 SSLerr(SSL_F_TLS_CONSTRUCT_EXTENSIONS, ERR_R_INTERNAL_ERROR);
586 if ((context & EXT_CLIENT_HELLO) != 0) {
587 reason = ssl_get_client_min_max_version(s, &min_version, &max_version);
589 SSLerr(SSL_F_TLS_CONSTRUCT_EXTENSIONS, reason);
594 /* Add custom extensions first */
595 if ((context & EXT_CLIENT_HELLO) != 0) {
596 custom_ext_init(&s->cert->cli_ext);
598 } else if ((context & EXT_TLS1_2_SERVER_HELLO) != 0) {
600 * We already initialised the custom extensions during ClientHello
603 * TODO(TLS1.3): We're going to need a new custom extension mechanism
604 * for TLS1.3, so that custom extensions can specify which of the
605 * multiple message they wish to add themselves to.
610 if (addcustom && !custom_ext_add(s, s->server, pkt, &tmpal)) {
611 SSLerr(SSL_F_TLS_CONSTRUCT_EXTENSIONS, ERR_R_INTERNAL_ERROR);
615 for (i = 0, thisexd = ext_defs; i < OSSL_NELEM(ext_defs); i++, thisexd++) {
616 int (*construct)(SSL *s, WPACKET *pkt, X509 *x, size_t chain, int *al);
618 /* Skip if not relevant for our context */
619 if ((thisexd->context & context) == 0)
622 construct = s->server ? thisexd->construct_stoc
623 : thisexd->construct_ctos;
625 /* Check if this extension is defined for our protocol. If not, skip */
627 && (thisexd->context & EXT_TLS_IMPLEMENTATION_ONLY)
629 || (s->version == SSL3_VERSION
630 && (thisexd->context & EXT_SSL3_ALLOWED) == 0)
632 && (thisexd->context & EXT_TLS1_2_AND_BELOW_ONLY)
635 && (thisexd->context & EXT_TLS1_3_ONLY) != 0
636 && (context & EXT_CLIENT_HELLO) == 0)
637 || ((thisexd->context & EXT_TLS1_3_ONLY) != 0
638 && (context & EXT_CLIENT_HELLO) != 0
639 && (SSL_IS_DTLS(s) || max_version < TLS1_3_VERSION))
640 || construct == NULL)
643 if (!construct(s, pkt, x, chain, &tmpal))
647 if (!WPACKET_close(pkt)) {
648 SSLerr(SSL_F_TLS_CONSTRUCT_EXTENSIONS, ERR_R_INTERNAL_ERROR);
660 * Built in extension finalisation and initialisation functions. All initialise
661 * or finalise the associated extension type for the given |context|. For
662 * finalisers |sent| is set to 1 if we saw the extension during parsing, and 0
663 * otherwise. These functions return 1 on success or 0 on failure. In the event
664 * of a failure then |*al| is populated with a suitable error code.
667 static int final_renegotiate(SSL *s, unsigned int context, int sent,
672 * Check if we can connect to a server that doesn't support safe
675 if (!(s->options & SSL_OP_LEGACY_SERVER_CONNECT)
676 && !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION)
678 *al = SSL_AD_HANDSHAKE_FAILURE;
679 SSLerr(SSL_F_FINAL_RENEGOTIATE,
680 SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
687 /* Need RI if renegotiating */
689 && !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION)
691 *al = SSL_AD_HANDSHAKE_FAILURE;
692 SSLerr(SSL_F_FINAL_RENEGOTIATE,
693 SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
701 static int init_server_name(SSL *s, unsigned int context)
704 s->servername_done = 0;
709 static int final_server_name(SSL *s, unsigned int context, int sent,
712 int ret = SSL_TLSEXT_ERR_NOACK;
713 int altmp = SSL_AD_UNRECOGNIZED_NAME;
715 if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0)
716 ret = s->ctx->tlsext_servername_callback(s, &altmp,
717 s->ctx->tlsext_servername_arg);
718 else if (s->initial_ctx != NULL
719 && s->initial_ctx->tlsext_servername_callback != 0)
720 ret = s->initial_ctx->tlsext_servername_callback(s, &altmp,
721 s->initial_ctx->tlsext_servername_arg);
724 case SSL_TLSEXT_ERR_ALERT_FATAL:
728 case SSL_TLSEXT_ERR_ALERT_WARNING:
732 case SSL_TLSEXT_ERR_NOACK:
733 s->servername_done = 0;
741 #ifndef OPENSSL_NO_EC
742 static int final_ec_pt_formats(SSL *s, unsigned int context, int sent,
745 unsigned long alg_k, alg_a;
750 alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
751 alg_a = s->s3->tmp.new_cipher->algorithm_auth;
754 * If we are client and using an elliptic curve cryptography cipher
755 * suite, then if server returns an EC point formats lists extension it
756 * must contain uncompressed.
758 if (s->tlsext_ecpointformatlist != NULL
759 && s->tlsext_ecpointformatlist_length > 0
760 && s->session->tlsext_ecpointformatlist != NULL
761 && s->session->tlsext_ecpointformatlist_length > 0
762 && ((alg_k & SSL_kECDHE) || (alg_a & SSL_aECDSA))) {
763 /* we are using an ECC cipher */
765 unsigned char *list = s->session->tlsext_ecpointformatlist;
767 for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++) {
768 if (*list++ == TLSEXT_ECPOINTFORMAT_uncompressed)
771 if (i == s->session->tlsext_ecpointformatlist_length) {
772 SSLerr(SSL_F_FINAL_EC_PT_FORMATS,
773 SSL_R_TLS_INVALID_ECPOINTFORMAT_LIST);
782 static int init_session_ticket(SSL *s, unsigned int context)
785 s->tlsext_ticket_expected = 0;
790 #ifndef OPENSSL_NO_OCSP
791 static int init_status_request(SSL *s, unsigned int context)
794 s->tlsext_status_type = TLSEXT_STATUSTYPE_nothing;
797 * Ensure we get sensible values passed to tlsext_status_cb in the event
798 * that we don't receive a status message
800 OPENSSL_free(s->tlsext_ocsp_resp);
801 s->tlsext_ocsp_resp = NULL;
802 s->tlsext_ocsp_resplen = 0;
809 #ifndef OPENSSL_NO_NEXTPROTONEG
810 static int init_npn(SSL *s, unsigned int context)
812 s->s3->next_proto_neg_seen = 0;
818 static int init_alpn(SSL *s, unsigned int context)
820 OPENSSL_free(s->s3->alpn_selected);
821 s->s3->alpn_selected = NULL;
823 s->s3->alpn_selected_len = 0;
824 OPENSSL_free(s->s3->alpn_proposed);
825 s->s3->alpn_proposed = NULL;
826 s->s3->alpn_proposed_len = 0;
831 static int final_alpn(SSL *s, unsigned int context, int sent, int *al)
833 const unsigned char *selected = NULL;
834 unsigned char selected_len = 0;
839 if (s->ctx->alpn_select_cb != NULL && s->s3->alpn_proposed != NULL) {
840 int r = s->ctx->alpn_select_cb(s, &selected, &selected_len,
841 s->s3->alpn_proposed,
842 (unsigned int)s->s3->alpn_proposed_len,
843 s->ctx->alpn_select_cb_arg);
845 if (r == SSL_TLSEXT_ERR_OK) {
846 OPENSSL_free(s->s3->alpn_selected);
847 s->s3->alpn_selected = OPENSSL_memdup(selected, selected_len);
848 if (s->s3->alpn_selected == NULL) {
849 *al = SSL_AD_INTERNAL_ERROR;
852 s->s3->alpn_selected_len = selected_len;
853 #ifndef OPENSSL_NO_NEXTPROTONEG
854 /* ALPN takes precedence over NPN. */
855 s->s3->next_proto_neg_seen = 0;
858 *al = SSL_AD_NO_APPLICATION_PROTOCOL;
866 static int init_sig_algs(SSL *s, unsigned int context)
868 /* Clear any signature algorithms extension received */
869 OPENSSL_free(s->s3->tmp.peer_sigalgs);
870 s->s3->tmp.peer_sigalgs = NULL;
875 #ifndef OPENSSL_NO_SRP
876 static int init_srp(SSL *s, unsigned int context)
878 OPENSSL_free(s->srp_ctx.login);
879 s->srp_ctx.login = NULL;
885 static int init_etm(SSL *s, unsigned int context)
887 s->s3->flags &= ~TLS1_FLAGS_ENCRYPT_THEN_MAC;
892 static int init_ems(SSL *s, unsigned int context)
895 s->s3->flags &= ~TLS1_FLAGS_RECEIVED_EXTMS;
900 static int final_ems(SSL *s, unsigned int context, int sent, int *al)
902 if (!s->server && s->hit) {
904 * Check extended master secret extension is consistent with
907 if (!(s->s3->flags & TLS1_FLAGS_RECEIVED_EXTMS) !=
908 !(s->session->flags & SSL_SESS_FLAG_EXTMS)) {
909 *al = SSL_AD_HANDSHAKE_FAILURE;
910 SSLerr(SSL_F_FINAL_EMS, SSL_R_INCONSISTENT_EXTMS);
918 #ifndef OPENSSL_NO_SRTP
919 static int init_srtp(SSL *s, unsigned int context)
922 s->srtp_profile = NULL;