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6b473aca | 1 | /* |
fecb3aae | 2 | * Copyright 2016-2022 The OpenSSL Project Authors. All Rights Reserved. |
6b473aca | 3 | * |
2c18d164 | 4 | * Licensed under the Apache License 2.0 (the "License"). You may not use |
6b473aca MC |
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 | |
8 | */ | |
9 | ||
650c6687 RB |
10 | #if defined(__TANDEM) && defined(_SPT_MODEL_) |
11 | # include <spthread.h> | |
12 | # include <spt_extensions.h> /* timeval */ | |
13 | #endif | |
14 | ||
f6370040 | 15 | #include <string.h> |
677963e5 | 16 | #include "internal/nelem.h" |
88050dd1 | 17 | #include "internal/cryptlib.h" |
706457b7 DMSP |
18 | #include "../ssl_local.h" |
19 | #include "statem_local.h" | |
6b473aca | 20 | |
f63a17d6 | 21 | static int final_renegotiate(SSL *s, unsigned int context, int sent); |
1266eefd | 22 | static int init_server_name(SSL *s, unsigned int context); |
f63a17d6 | 23 | static int final_server_name(SSL *s, unsigned int context, int sent); |
f63a17d6 | 24 | static int final_ec_pt_formats(SSL *s, unsigned int context, int sent); |
1266eefd | 25 | static int init_session_ticket(SSL *s, unsigned int context); |
8f8c11d8 | 26 | #ifndef OPENSSL_NO_OCSP |
1266eefd | 27 | static int init_status_request(SSL *s, unsigned int context); |
8f8c11d8 | 28 | #endif |
805a2e9e | 29 | #ifndef OPENSSL_NO_NEXTPROTONEG |
1266eefd | 30 | static int init_npn(SSL *s, unsigned int context); |
805a2e9e | 31 | #endif |
1266eefd | 32 | static int init_alpn(SSL *s, unsigned int context); |
f63a17d6 | 33 | static int final_alpn(SSL *s, unsigned int context, int sent); |
c589c34e | 34 | static int init_sig_algs_cert(SSL *s, unsigned int context); |
1266eefd | 35 | static int init_sig_algs(SSL *s, unsigned int context); |
45615c5f | 36 | static int init_certificate_authorities(SSL *s, unsigned int context); |
b186a592 MC |
37 | static EXT_RETURN tls_construct_certificate_authorities(SSL *s, WPACKET *pkt, |
38 | unsigned int context, | |
39 | X509 *x, | |
f63a17d6 | 40 | size_t chainidx); |
45615c5f DSH |
41 | static int tls_parse_certificate_authorities(SSL *s, PACKET *pkt, |
42 | unsigned int context, X509 *x, | |
f63a17d6 | 43 | size_t chainidx); |
805a2e9e | 44 | #ifndef OPENSSL_NO_SRP |
1266eefd | 45 | static int init_srp(SSL *s, unsigned int context); |
805a2e9e | 46 | #endif |
3f987381 | 47 | static int init_ec_point_formats(SSL *s, unsigned int context); |
1266eefd MC |
48 | static int init_etm(SSL *s, unsigned int context); |
49 | static int init_ems(SSL *s, unsigned int context); | |
f63a17d6 | 50 | static int final_ems(SSL *s, unsigned int context, int sent); |
b2f7e8c0 | 51 | static int init_psk_kex_modes(SSL *s, unsigned int context); |
f63a17d6 | 52 | static int final_key_share(SSL *s, unsigned int context, int sent); |
805a2e9e | 53 | #ifndef OPENSSL_NO_SRTP |
1266eefd | 54 | static int init_srtp(SSL *s, unsigned int context); |
805a2e9e | 55 | #endif |
f63a17d6 MC |
56 | static int final_sig_algs(SSL *s, unsigned int context, int sent); |
57 | static int final_early_data(SSL *s, unsigned int context, int sent); | |
58 | static int final_maxfragmentlen(SSL *s, unsigned int context, int sent); | |
9d75dce3 | 59 | static int init_post_handshake_auth(SSL *s, unsigned int context); |
efe0f315 | 60 | static int final_psk(SSL *s, unsigned int context, int sent); |
9d75dce3 | 61 | |
70af3d8e | 62 | /* Structure to define a built-in extension */ |
1266eefd MC |
63 | typedef struct extensions_definition_st { |
64 | /* The defined type for the extension */ | |
6b473aca | 65 | unsigned int type; |
1266eefd MC |
66 | /* |
67 | * The context that this extension applies to, e.g. what messages and | |
68 | * protocol versions | |
69 | */ | |
70 | unsigned int context; | |
68db4dda | 71 | /* |
805a2e9e MC |
72 | * Initialise extension before parsing. Always called for relevant contexts |
73 | * even if extension not present | |
68db4dda | 74 | */ |
1266eefd MC |
75 | int (*init)(SSL *s, unsigned int context); |
76 | /* Parse extension sent from client to server */ | |
61138358 | 77 | int (*parse_ctos)(SSL *s, PACKET *pkt, unsigned int context, X509 *x, |
f63a17d6 | 78 | size_t chainidx); |
1266eefd | 79 | /* Parse extension send from server to client */ |
61138358 | 80 | int (*parse_stoc)(SSL *s, PACKET *pkt, unsigned int context, X509 *x, |
f63a17d6 | 81 | size_t chainidx); |
1266eefd | 82 | /* Construct extension sent from server to client */ |
b186a592 | 83 | EXT_RETURN (*construct_stoc)(SSL *s, WPACKET *pkt, unsigned int context, |
f63a17d6 | 84 | X509 *x, size_t chainidx); |
1266eefd | 85 | /* Construct extension sent from client to server */ |
b186a592 | 86 | EXT_RETURN (*construct_ctos)(SSL *s, WPACKET *pkt, unsigned int context, |
f63a17d6 | 87 | X509 *x, size_t chainidx); |
68db4dda | 88 | /* |
805a2e9e MC |
89 | * Finalise extension after parsing. Always called where an extensions was |
90 | * initialised even if the extension was not present. |sent| is set to 1 if | |
91 | * the extension was seen, or 0 otherwise. | |
68db4dda | 92 | */ |
f63a17d6 | 93 | int (*final)(SSL *s, unsigned int context, int sent); |
6b473aca MC |
94 | } EXTENSION_DEFINITION; |
95 | ||
4b299b8e | 96 | /* |
70af3d8e | 97 | * Definitions of all built-in extensions. NOTE: Changes in the number or order |
bd91e3c8 | 98 | * of these extensions should be mirrored with equivalent changes to the |
706457b7 | 99 | * indexes ( TLSEXT_IDX_* ) defined in ssl_local.h. |
70af3d8e MC |
100 | * Each extension has an initialiser, a client and |
101 | * server side parser and a finaliser. The initialiser is called (if the | |
102 | * extension is relevant to the given context) even if we did not see the | |
103 | * extension in the message that we received. The parser functions are only | |
104 | * called if we see the extension in the message. The finalisers are always | |
105 | * called if the initialiser was called. | |
106 | * There are also server and client side constructor functions which are always | |
107 | * called during message construction if the extension is relevant for the | |
108 | * given context. | |
109 | * The initialisation, parsing, finalisation and construction functions are | |
110 | * always called in the order defined in this list. Some extensions may depend | |
111 | * on others having been processed first, so the order of this list is | |
112 | * significant. | |
113 | * The extension context is defined by a series of flags which specify which | |
114 | * messages the extension is relevant to. These flags also specify whether the | |
3e6c1da8 | 115 | * extension is relevant to a particular protocol or protocol version. |
a1448c26 | 116 | * |
10ed1b72 TS |
117 | * NOTE: WebSphere Application Server 7+ cannot handle empty extensions at |
118 | * the end, keep these extensions before signature_algorithm. | |
4b299b8e | 119 | */ |
0785274c | 120 | #define INVALID_EXTENSION { 0x10000, 0, NULL, NULL, NULL, NULL, NULL, NULL } |
6b473aca MC |
121 | static const EXTENSION_DEFINITION ext_defs[] = { |
122 | { | |
123 | TLSEXT_TYPE_renegotiate, | |
fe874d27 MC |
124 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO |
125 | | SSL_EXT_SSL3_ALLOWED | SSL_EXT_TLS1_2_AND_BELOW_ONLY, | |
1266eefd MC |
126 | NULL, tls_parse_ctos_renegotiate, tls_parse_stoc_renegotiate, |
127 | tls_construct_stoc_renegotiate, tls_construct_ctos_renegotiate, | |
128 | final_renegotiate | |
6b473aca MC |
129 | }, |
130 | { | |
131 | TLSEXT_TYPE_server_name, | |
fe874d27 MC |
132 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO |
133 | | SSL_EXT_TLS1_3_ENCRYPTED_EXTENSIONS, | |
1266eefd MC |
134 | init_server_name, |
135 | tls_parse_ctos_server_name, tls_parse_stoc_server_name, | |
136 | tls_construct_stoc_server_name, tls_construct_ctos_server_name, | |
137 | final_server_name | |
6b473aca | 138 | }, |
cf72c757 F |
139 | { |
140 | TLSEXT_TYPE_max_fragment_length, | |
141 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO | |
142 | | SSL_EXT_TLS1_3_ENCRYPTED_EXTENSIONS, | |
143 | NULL, tls_parse_ctos_maxfragmentlen, tls_parse_stoc_maxfragmentlen, | |
144 | tls_construct_stoc_maxfragmentlen, tls_construct_ctos_maxfragmentlen, | |
145 | final_maxfragmentlen | |
146 | }, | |
6b473aca MC |
147 | #ifndef OPENSSL_NO_SRP |
148 | { | |
149 | TLSEXT_TYPE_srp, | |
fe874d27 | 150 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_AND_BELOW_ONLY, |
1266eefd | 151 | init_srp, tls_parse_ctos_srp, NULL, NULL, tls_construct_ctos_srp, NULL |
6b473aca | 152 | }, |
0785274c MC |
153 | #else |
154 | INVALID_EXTENSION, | |
6b473aca | 155 | #endif |
6b473aca MC |
156 | { |
157 | TLSEXT_TYPE_ec_point_formats, | |
fe874d27 MC |
158 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO |
159 | | SSL_EXT_TLS1_2_AND_BELOW_ONLY, | |
3f987381 | 160 | init_ec_point_formats, tls_parse_ctos_ec_pt_formats, tls_parse_stoc_ec_pt_formats, |
1266eefd MC |
161 | tls_construct_stoc_ec_pt_formats, tls_construct_ctos_ec_pt_formats, |
162 | final_ec_pt_formats | |
6b473aca MC |
163 | }, |
164 | { | |
7bc2bddb BK |
165 | /* |
166 | * "supported_groups" is spread across several specifications. | |
167 | * It was originally specified as "elliptic_curves" in RFC 4492, | |
168 | * and broadened to include named FFDH groups by RFC 7919. | |
169 | * Both RFCs 4492 and 7919 do not include a provision for the server | |
170 | * to indicate to the client the complete list of groups supported | |
171 | * by the server, with the server instead just indicating the | |
172 | * selected group for this connection in the ServerKeyExchange | |
173 | * message. TLS 1.3 adds a scheme for the server to indicate | |
174 | * to the client its list of supported groups in the | |
175 | * EncryptedExtensions message, but none of the relevant | |
176 | * specifications permit sending supported_groups in the ServerHello. | |
177 | * Nonetheless (possibly due to the close proximity to the | |
178 | * "ec_point_formats" extension, which is allowed in the ServerHello), | |
179 | * there are several servers that send this extension in the | |
180 | * ServerHello anyway. Up to and including the 1.1.0 release, | |
181 | * we did not check for the presence of nonpermitted extensions, | |
182 | * so to avoid a regression, we must permit this extension in the | |
183 | * TLS 1.2 ServerHello as well. | |
184 | * | |
185 | * Note that there is no tls_parse_stoc_supported_groups function, | |
186 | * so we do not perform any additional parsing, validation, or | |
187 | * processing on the server's group list -- this is just a minimal | |
188 | * change to preserve compatibility with these misbehaving servers. | |
189 | */ | |
6b473aca | 190 | TLSEXT_TYPE_supported_groups, |
7bc2bddb BK |
191 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_3_ENCRYPTED_EXTENSIONS |
192 | | SSL_EXT_TLS1_2_SERVER_HELLO, | |
1266eefd | 193 | NULL, tls_parse_ctos_supported_groups, NULL, |
6af87546 | 194 | tls_construct_stoc_supported_groups, |
1266eefd | 195 | tls_construct_ctos_supported_groups, NULL |
6b473aca | 196 | }, |
6b473aca MC |
197 | { |
198 | TLSEXT_TYPE_session_ticket, | |
fe874d27 MC |
199 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO |
200 | | SSL_EXT_TLS1_2_AND_BELOW_ONLY, | |
1266eefd MC |
201 | init_session_ticket, tls_parse_ctos_session_ticket, |
202 | tls_parse_stoc_session_ticket, tls_construct_stoc_session_ticket, | |
203 | tls_construct_ctos_session_ticket, NULL | |
6b473aca | 204 | }, |
ab83e314 | 205 | #ifndef OPENSSL_NO_OCSP |
6b473aca MC |
206 | { |
207 | TLSEXT_TYPE_status_request, | |
fe874d27 | 208 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO |
5de683d2 | 209 | | SSL_EXT_TLS1_3_CERTIFICATE | SSL_EXT_TLS1_3_CERTIFICATE_REQUEST, |
1266eefd MC |
210 | init_status_request, tls_parse_ctos_status_request, |
211 | tls_parse_stoc_status_request, tls_construct_stoc_status_request, | |
f63e4288 | 212 | tls_construct_ctos_status_request, NULL |
6b473aca | 213 | }, |
0785274c MC |
214 | #else |
215 | INVALID_EXTENSION, | |
ab83e314 | 216 | #endif |
6b473aca MC |
217 | #ifndef OPENSSL_NO_NEXTPROTONEG |
218 | { | |
219 | TLSEXT_TYPE_next_proto_neg, | |
fe874d27 MC |
220 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO |
221 | | SSL_EXT_TLS1_2_AND_BELOW_ONLY, | |
1266eefd MC |
222 | init_npn, tls_parse_ctos_npn, tls_parse_stoc_npn, |
223 | tls_construct_stoc_next_proto_neg, tls_construct_ctos_npn, NULL | |
6b473aca | 224 | }, |
0785274c MC |
225 | #else |
226 | INVALID_EXTENSION, | |
6b473aca MC |
227 | #endif |
228 | { | |
02f0274e MC |
229 | /* |
230 | * Must appear in this list after server_name so that finalisation | |
231 | * happens after server_name callbacks | |
232 | */ | |
6b473aca | 233 | TLSEXT_TYPE_application_layer_protocol_negotiation, |
fe874d27 MC |
234 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO |
235 | | SSL_EXT_TLS1_3_ENCRYPTED_EXTENSIONS, | |
1266eefd | 236 | init_alpn, tls_parse_ctos_alpn, tls_parse_stoc_alpn, |
630369d9 | 237 | tls_construct_stoc_alpn, tls_construct_ctos_alpn, final_alpn |
6b473aca | 238 | }, |
7da160b0 | 239 | #ifndef OPENSSL_NO_SRTP |
6b473aca MC |
240 | { |
241 | TLSEXT_TYPE_use_srtp, | |
fe874d27 MC |
242 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO |
243 | | SSL_EXT_TLS1_3_ENCRYPTED_EXTENSIONS | SSL_EXT_DTLS_ONLY, | |
1266eefd MC |
244 | init_srtp, tls_parse_ctos_use_srtp, tls_parse_stoc_use_srtp, |
245 | tls_construct_stoc_use_srtp, tls_construct_ctos_use_srtp, NULL | |
6b473aca | 246 | }, |
0785274c MC |
247 | #else |
248 | INVALID_EXTENSION, | |
7da160b0 | 249 | #endif |
6b473aca MC |
250 | { |
251 | TLSEXT_TYPE_encrypt_then_mac, | |
fe874d27 MC |
252 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO |
253 | | SSL_EXT_TLS1_2_AND_BELOW_ONLY, | |
1266eefd MC |
254 | init_etm, tls_parse_ctos_etm, tls_parse_stoc_etm, |
255 | tls_construct_stoc_etm, tls_construct_ctos_etm, NULL | |
6b473aca | 256 | }, |
6dd083fd | 257 | #ifndef OPENSSL_NO_CT |
6b473aca MC |
258 | { |
259 | TLSEXT_TYPE_signed_certificate_timestamp, | |
fe874d27 | 260 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO |
5de683d2 | 261 | | SSL_EXT_TLS1_3_CERTIFICATE | SSL_EXT_TLS1_3_CERTIFICATE_REQUEST, |
68db4dda | 262 | NULL, |
6b473aca MC |
263 | /* |
264 | * No server side support for this, but can be provided by a custom | |
265 | * extension. This is an exception to the rule that custom extensions | |
266 | * cannot override built in ones. | |
267 | */ | |
1266eefd | 268 | NULL, tls_parse_stoc_sct, NULL, tls_construct_ctos_sct, NULL |
6b473aca | 269 | }, |
0785274c MC |
270 | #else |
271 | INVALID_EXTENSION, | |
6dd083fd | 272 | #endif |
6b473aca MC |
273 | { |
274 | TLSEXT_TYPE_extended_master_secret, | |
fe874d27 MC |
275 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO |
276 | | SSL_EXT_TLS1_2_AND_BELOW_ONLY, | |
1266eefd MC |
277 | init_ems, tls_parse_ctos_ems, tls_parse_stoc_ems, |
278 | tls_construct_stoc_ems, tls_construct_ctos_ems, final_ems | |
6b473aca | 279 | }, |
c589c34e BK |
280 | { |
281 | TLSEXT_TYPE_signature_algorithms_cert, | |
282 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_3_CERTIFICATE_REQUEST, | |
283 | init_sig_algs_cert, tls_parse_ctos_sig_algs_cert, | |
284 | tls_parse_ctos_sig_algs_cert, | |
285 | /* We do not generate signature_algorithms_cert at present. */ | |
286 | NULL, NULL, NULL | |
287 | }, | |
9d75dce3 TS |
288 | { |
289 | TLSEXT_TYPE_post_handshake_auth, | |
290 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_3_ONLY, | |
291 | init_post_handshake_auth, | |
292 | tls_parse_ctos_post_handshake_auth, NULL, | |
293 | NULL, tls_construct_ctos_post_handshake_auth, | |
294 | NULL, | |
295 | }, | |
10ed1b72 TS |
296 | { |
297 | TLSEXT_TYPE_signature_algorithms, | |
298 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_3_CERTIFICATE_REQUEST, | |
299 | init_sig_algs, tls_parse_ctos_sig_algs, | |
300 | tls_parse_ctos_sig_algs, tls_construct_ctos_sig_algs, | |
301 | tls_construct_ctos_sig_algs, final_sig_algs | |
302 | }, | |
6b473aca MC |
303 | { |
304 | TLSEXT_TYPE_supported_versions, | |
27e462f1 MC |
305 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_3_SERVER_HELLO |
306 | | SSL_EXT_TLS1_3_HELLO_RETRY_REQUEST | SSL_EXT_TLS_IMPLEMENTATION_ONLY, | |
68db4dda | 307 | NULL, |
6b473aca | 308 | /* Processed inline as part of version selection */ |
88050dd1 MC |
309 | NULL, tls_parse_stoc_supported_versions, |
310 | tls_construct_stoc_supported_versions, | |
311 | tls_construct_ctos_supported_versions, NULL | |
6b473aca | 312 | }, |
b2f7e8c0 | 313 | { |
b2f7e8c0 | 314 | TLSEXT_TYPE_psk_kex_modes, |
fe874d27 MC |
315 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS_IMPLEMENTATION_ONLY |
316 | | SSL_EXT_TLS1_3_ONLY, | |
b2f7e8c0 MC |
317 | init_psk_kex_modes, tls_parse_ctos_psk_kex_modes, NULL, NULL, |
318 | tls_construct_ctos_psk_kex_modes, NULL | |
319 | }, | |
6b473aca | 320 | { |
70af3d8e MC |
321 | /* |
322 | * Must be in this list after supported_groups. We need that to have | |
323 | * been parsed before we do this one. | |
324 | */ | |
6b473aca | 325 | TLSEXT_TYPE_key_share, |
fe874d27 MC |
326 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_3_SERVER_HELLO |
327 | | SSL_EXT_TLS1_3_HELLO_RETRY_REQUEST | SSL_EXT_TLS_IMPLEMENTATION_ONLY | |
328 | | SSL_EXT_TLS1_3_ONLY, | |
1266eefd | 329 | NULL, tls_parse_ctos_key_share, tls_parse_stoc_key_share, |
f4bbb37c MC |
330 | tls_construct_stoc_key_share, tls_construct_ctos_key_share, |
331 | final_key_share | |
7da160b0 | 332 | }, |
cfef5027 | 333 | { |
97ea1e7f | 334 | /* Must be after key_share */ |
cfef5027 | 335 | TLSEXT_TYPE_cookie, |
fe874d27 MC |
336 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_3_HELLO_RETRY_REQUEST |
337 | | SSL_EXT_TLS_IMPLEMENTATION_ONLY | SSL_EXT_TLS1_3_ONLY, | |
43054d3d MC |
338 | NULL, tls_parse_ctos_cookie, tls_parse_stoc_cookie, |
339 | tls_construct_stoc_cookie, tls_construct_ctos_cookie, NULL | |
cfef5027 | 340 | }, |
7da160b0 MC |
341 | { |
342 | /* | |
343 | * Special unsolicited ServerHello extension only used when | |
23fed8ba MC |
344 | * SSL_OP_CRYPTOPRO_TLSEXT_BUG is set. We allow it in a ClientHello but |
345 | * ignore it. | |
7da160b0 MC |
346 | */ |
347 | TLSEXT_TYPE_cryptopro_bug, | |
23fed8ba MC |
348 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO |
349 | | SSL_EXT_TLS1_2_AND_BELOW_ONLY, | |
1266eefd | 350 | NULL, NULL, NULL, tls_construct_stoc_cryptopro_bug, NULL, NULL |
ab83e314 | 351 | }, |
38df5a45 MC |
352 | { |
353 | TLSEXT_TYPE_early_data, | |
fe874d27 | 354 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_3_ENCRYPTED_EXTENSIONS |
6e99ae58 | 355 | | SSL_EXT_TLS1_3_NEW_SESSION_TICKET | SSL_EXT_TLS1_3_ONLY, |
38df5a45 MC |
356 | NULL, tls_parse_ctos_early_data, tls_parse_stoc_early_data, |
357 | tls_construct_stoc_early_data, tls_construct_ctos_early_data, | |
358 | final_early_data | |
359 | }, | |
45615c5f DSH |
360 | { |
361 | TLSEXT_TYPE_certificate_authorities, | |
fe874d27 MC |
362 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_3_CERTIFICATE_REQUEST |
363 | | SSL_EXT_TLS1_3_ONLY, | |
45615c5f DSH |
364 | init_certificate_authorities, |
365 | tls_parse_certificate_authorities, tls_parse_certificate_authorities, | |
366 | tls_construct_certificate_authorities, | |
367 | tls_construct_certificate_authorities, NULL, | |
368 | }, | |
ab83e314 | 369 | { |
ec15acb6 | 370 | /* Must be immediately before pre_shared_key */ |
ab83e314 | 371 | TLSEXT_TYPE_padding, |
fe874d27 | 372 | SSL_EXT_CLIENT_HELLO, |
68db4dda | 373 | NULL, |
ab83e314 | 374 | /* We send this, but don't read it */ |
1266eefd | 375 | NULL, NULL, NULL, tls_construct_ctos_padding, NULL |
ec15acb6 MC |
376 | }, |
377 | { | |
378 | /* Required by the TLSv1.3 spec to always be the last extension */ | |
379 | TLSEXT_TYPE_psk, | |
fe874d27 MC |
380 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_3_SERVER_HELLO |
381 | | SSL_EXT_TLS_IMPLEMENTATION_ONLY | SSL_EXT_TLS1_3_ONLY, | |
0247086d | 382 | NULL, tls_parse_ctos_psk, tls_parse_stoc_psk, tls_construct_stoc_psk, |
efe0f315 | 383 | tls_construct_ctos_psk, final_psk |
6b473aca MC |
384 | } |
385 | }; | |
386 | ||
43ae5eed MC |
387 | /* Check whether an extension's context matches the current context */ |
388 | static int validate_context(SSL *s, unsigned int extctx, unsigned int thisctx) | |
389 | { | |
390 | /* Check we're allowed to use this extension in this context */ | |
391 | if ((thisctx & extctx) == 0) | |
392 | return 0; | |
393 | ||
394 | if (SSL_IS_DTLS(s)) { | |
395 | if ((extctx & SSL_EXT_TLS_ONLY) != 0) | |
396 | return 0; | |
397 | } else if ((extctx & SSL_EXT_DTLS_ONLY) != 0) { | |
398 | return 0; | |
399 | } | |
400 | ||
401 | return 1; | |
402 | } | |
403 | ||
88050dd1 MC |
404 | int tls_validate_all_contexts(SSL *s, unsigned int thisctx, RAW_EXTENSION *exts) |
405 | { | |
406 | size_t i, num_exts, builtin_num = OSSL_NELEM(ext_defs), offset; | |
407 | RAW_EXTENSION *thisext; | |
408 | unsigned int context; | |
409 | ENDPOINT role = ENDPOINT_BOTH; | |
410 | ||
411 | if ((thisctx & SSL_EXT_CLIENT_HELLO) != 0) | |
412 | role = ENDPOINT_SERVER; | |
413 | else if ((thisctx & SSL_EXT_TLS1_2_SERVER_HELLO) != 0) | |
414 | role = ENDPOINT_CLIENT; | |
415 | ||
416 | /* Calculate the number of extensions in the extensions list */ | |
417 | num_exts = builtin_num + s->cert->custext.meths_count; | |
418 | ||
419 | for (thisext = exts, i = 0; i < num_exts; i++, thisext++) { | |
420 | if (!thisext->present) | |
421 | continue; | |
422 | ||
423 | if (i < builtin_num) { | |
424 | context = ext_defs[i].context; | |
425 | } else { | |
426 | custom_ext_method *meth = NULL; | |
427 | ||
428 | meth = custom_ext_find(&s->cert->custext, role, thisext->type, | |
429 | &offset); | |
430 | if (!ossl_assert(meth != NULL)) | |
431 | return 0; | |
432 | context = meth->context; | |
433 | } | |
434 | ||
435 | if (!validate_context(s, context, thisctx)) | |
436 | return 0; | |
437 | } | |
438 | ||
439 | return 1; | |
440 | } | |
441 | ||
6b473aca MC |
442 | /* |
443 | * Verify whether we are allowed to use the extension |type| in the current | |
444 | * |context|. Returns 1 to indicate the extension is allowed or unknown or 0 to | |
70af3d8e | 445 | * indicate the extension is not allowed. If returning 1 then |*found| is set to |
69687aa8 | 446 | * the definition for the extension we found. |
6b473aca | 447 | */ |
70af3d8e | 448 | static int verify_extension(SSL *s, unsigned int context, unsigned int type, |
1266eefd MC |
449 | custom_ext_methods *meths, RAW_EXTENSION *rawexlist, |
450 | RAW_EXTENSION **found) | |
6b473aca MC |
451 | { |
452 | size_t i; | |
70af3d8e | 453 | size_t builtin_num = OSSL_NELEM(ext_defs); |
d270de32 | 454 | const EXTENSION_DEFINITION *thisext; |
6b473aca | 455 | |
1266eefd MC |
456 | for (i = 0, thisext = ext_defs; i < builtin_num; i++, thisext++) { |
457 | if (type == thisext->type) { | |
43ae5eed | 458 | if (!validate_context(s, thisext->context, context)) |
6b473aca MC |
459 | return 0; |
460 | ||
1266eefd | 461 | *found = &rawexlist[i]; |
6b473aca MC |
462 | return 1; |
463 | } | |
464 | } | |
465 | ||
70af3d8e MC |
466 | /* Check the custom extensions */ |
467 | if (meths != NULL) { | |
43ae5eed | 468 | size_t offset = 0; |
787d9ec7 | 469 | ENDPOINT role = ENDPOINT_BOTH; |
43ae5eed MC |
470 | custom_ext_method *meth = NULL; |
471 | ||
472 | if ((context & SSL_EXT_CLIENT_HELLO) != 0) | |
787d9ec7 | 473 | role = ENDPOINT_SERVER; |
43ae5eed | 474 | else if ((context & SSL_EXT_TLS1_2_SERVER_HELLO) != 0) |
787d9ec7 | 475 | role = ENDPOINT_CLIENT; |
43ae5eed | 476 | |
787d9ec7 | 477 | meth = custom_ext_find(meths, role, type, &offset); |
43ae5eed MC |
478 | if (meth != NULL) { |
479 | if (!validate_context(s, meth->context, context)) | |
480 | return 0; | |
481 | *found = &rawexlist[offset + builtin_num]; | |
482 | return 1; | |
6b473aca MC |
483 | } |
484 | } | |
485 | ||
70af3d8e | 486 | /* Unknown extension. We allow it */ |
1266eefd | 487 | *found = NULL; |
70af3d8e | 488 | return 1; |
6b473aca MC |
489 | } |
490 | ||
70af3d8e MC |
491 | /* |
492 | * Check whether the context defined for an extension |extctx| means whether | |
493 | * the extension is relevant for the current context |thisctx| or not. Returns | |
494 | * 1 if the extension is relevant for this context, and 0 otherwise | |
495 | */ | |
43ae5eed | 496 | int extension_is_relevant(SSL *s, unsigned int extctx, unsigned int thisctx) |
805a2e9e | 497 | { |
a2b97bdf MC |
498 | int is_tls13; |
499 | ||
500 | /* | |
501 | * For HRR we haven't selected the version yet but we know it will be | |
502 | * TLSv1.3 | |
503 | */ | |
504 | if ((thisctx & SSL_EXT_TLS1_3_HELLO_RETRY_REQUEST) != 0) | |
505 | is_tls13 = 1; | |
506 | else | |
507 | is_tls13 = SSL_IS_TLS13(s); | |
508 | ||
805a2e9e | 509 | if ((SSL_IS_DTLS(s) |
fe874d27 | 510 | && (extctx & SSL_EXT_TLS_IMPLEMENTATION_ONLY) != 0) |
805a2e9e | 511 | || (s->version == SSL3_VERSION |
fe874d27 | 512 | && (extctx & SSL_EXT_SSL3_ALLOWED) == 0) |
ee36b963 BK |
513 | /* |
514 | * Note that SSL_IS_TLS13() means "TLS 1.3 has been negotiated", | |
515 | * which is never true when generating the ClientHello. | |
516 | * However, version negotiation *has* occurred by the time the | |
517 | * ClientHello extensions are being parsed. | |
518 | * Be careful to allow TLS 1.3-only extensions when generating | |
519 | * the ClientHello. | |
520 | */ | |
a2b97bdf | 521 | || (is_tls13 && (extctx & SSL_EXT_TLS1_2_AND_BELOW_ONLY) != 0) |
ee36b963 BK |
522 | || (!is_tls13 && (extctx & SSL_EXT_TLS1_3_ONLY) != 0 |
523 | && (thisctx & SSL_EXT_CLIENT_HELLO) == 0) | |
524 | || (s->server && !is_tls13 && (extctx & SSL_EXT_TLS1_3_ONLY) != 0) | |
43ae5eed | 525 | || (s->hit && (extctx & SSL_EXT_IGNORE_ON_RESUMPTION) != 0)) |
805a2e9e | 526 | return 0; |
805a2e9e MC |
527 | return 1; |
528 | } | |
529 | ||
6b473aca MC |
530 | /* |
531 | * Gather a list of all the extensions from the data in |packet]. |context| | |
70af3d8e | 532 | * tells us which message this extension is for. The raw extension data is |
29bfd5b7 MC |
533 | * stored in |*res| on success. We don't actually process the content of the |
534 | * extensions yet, except to check their types. This function also runs the | |
535 | * initialiser functions for all known extensions if |init| is nonzero (whether | |
536 | * we have collected them or not). If successful the caller is responsible for | |
537 | * freeing the contents of |*res|. | |
6b473aca MC |
538 | * |
539 | * Per http://tools.ietf.org/html/rfc5246#section-7.4.1.4, there may not be | |
540 | * more than one extension of the same type in a ClientHello or ServerHello. | |
541 | * This function returns 1 if all extensions are unique and we have parsed their | |
542 | * types, and 0 if the extensions contain duplicates, could not be successfully | |
1266eefd | 543 | * found, or an internal error occurred. We only check duplicates for |
70af3d8e | 544 | * extensions that we know about. We ignore others. |
6b473aca | 545 | */ |
6b473aca | 546 | int tls_collect_extensions(SSL *s, PACKET *packet, unsigned int context, |
f63a17d6 | 547 | RAW_EXTENSION **res, size_t *len, int init) |
6b473aca MC |
548 | { |
549 | PACKET extensions = *packet; | |
d270de32 | 550 | size_t i = 0; |
fc5ece2e | 551 | size_t num_exts; |
43ae5eed | 552 | custom_ext_methods *exts = &s->cert->custext; |
6b473aca | 553 | RAW_EXTENSION *raw_extensions = NULL; |
d270de32 | 554 | const EXTENSION_DEFINITION *thisexd; |
6b473aca | 555 | |
ecc2f938 MC |
556 | *res = NULL; |
557 | ||
70af3d8e MC |
558 | /* |
559 | * Initialise server side custom extensions. Client side is done during | |
560 | * construction of extensions for the ClientHello. | |
561 | */ | |
43ae5eed MC |
562 | if ((context & SSL_EXT_CLIENT_HELLO) != 0) |
563 | custom_ext_init(&s->cert->custext); | |
70af3d8e | 564 | |
fc5ece2e BK |
565 | num_exts = OSSL_NELEM(ext_defs) + (exts != NULL ? exts->meths_count : 0); |
566 | raw_extensions = OPENSSL_zalloc(num_exts * sizeof(*raw_extensions)); | |
70af3d8e | 567 | if (raw_extensions == NULL) { |
c48ffbcc | 568 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_MALLOC_FAILURE); |
70af3d8e MC |
569 | return 0; |
570 | } | |
571 | ||
193b5d76 | 572 | i = 0; |
6b473aca | 573 | while (PACKET_remaining(&extensions) > 0) { |
b186a592 | 574 | unsigned int type, idx; |
6b473aca | 575 | PACKET extension; |
1266eefd | 576 | RAW_EXTENSION *thisex; |
6b473aca MC |
577 | |
578 | if (!PACKET_get_net_2(&extensions, &type) || | |
579 | !PACKET_get_length_prefixed_2(&extensions, &extension)) { | |
c48ffbcc | 580 | SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_R_BAD_EXTENSION); |
6b473aca MC |
581 | goto err; |
582 | } | |
70af3d8e MC |
583 | /* |
584 | * Verify this extension is allowed. We only check duplicates for | |
652a6b7e MC |
585 | * extensions that we recognise. We also have a special case for the |
586 | * PSK extension, which must be the last one in the ClientHello. | |
70af3d8e | 587 | */ |
1266eefd | 588 | if (!verify_extension(s, context, type, exts, raw_extensions, &thisex) |
652a6b7e MC |
589 | || (thisex != NULL && thisex->present == 1) |
590 | || (type == TLSEXT_TYPE_psk | |
fe874d27 | 591 | && (context & SSL_EXT_CLIENT_HELLO) != 0 |
652a6b7e | 592 | && PACKET_remaining(&extensions) != 0)) { |
c48ffbcc | 593 | SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_R_BAD_EXTENSION); |
6b473aca MC |
594 | goto err; |
595 | } | |
b186a592 MC |
596 | idx = thisex - raw_extensions; |
597 | /*- | |
598 | * Check that we requested this extension (if appropriate). Requests can | |
599 | * be sent in the ClientHello and CertificateRequest. Unsolicited | |
600 | * extensions can be sent in the NewSessionTicket. We only do this for | |
601 | * the built-in extensions. Custom extensions have a different but | |
602 | * similar check elsewhere. | |
603 | * Special cases: | |
604 | * - The HRR cookie extension is unsolicited | |
605 | * - The renegotiate extension is unsolicited (the client signals | |
606 | * support via an SCSV) | |
607 | * - The signed_certificate_timestamp extension can be provided by a | |
608 | * custom extension or by the built-in version. We let the extension | |
609 | * itself handle unsolicited response checks. | |
610 | */ | |
611 | if (idx < OSSL_NELEM(ext_defs) | |
612 | && (context & (SSL_EXT_CLIENT_HELLO | |
613 | | SSL_EXT_TLS1_3_CERTIFICATE_REQUEST | |
614 | | SSL_EXT_TLS1_3_NEW_SESSION_TICKET)) == 0 | |
615 | && type != TLSEXT_TYPE_cookie | |
616 | && type != TLSEXT_TYPE_renegotiate | |
617 | && type != TLSEXT_TYPE_signed_certificate_timestamp | |
673e0bbb DB |
618 | && (s->ext.extflags[idx] & SSL_EXT_FLAG_SENT) == 0 |
619 | #ifndef OPENSSL_NO_GOST | |
620 | && !((context & SSL_EXT_TLS1_2_SERVER_HELLO) != 0 | |
621 | && type == TLSEXT_TYPE_cryptopro_bug) | |
622 | #endif | |
dd6b2706 | 623 | ) { |
f63a17d6 | 624 | SSLfatal(s, SSL_AD_UNSUPPORTED_EXTENSION, |
c48ffbcc | 625 | SSL_R_UNSOLICITED_EXTENSION); |
b186a592 MC |
626 | goto err; |
627 | } | |
1266eefd MC |
628 | if (thisex != NULL) { |
629 | thisex->data = extension; | |
630 | thisex->present = 1; | |
631 | thisex->type = type; | |
193b5d76 | 632 | thisex->received_order = i++; |
b93a295a TS |
633 | if (s->ext.debug_cb) |
634 | s->ext.debug_cb(s, !s->server, thisex->type, | |
635 | PACKET_data(&thisex->data), | |
636 | PACKET_remaining(&thisex->data), | |
637 | s->ext.debug_arg); | |
6b473aca MC |
638 | } |
639 | } | |
640 | ||
735d5b59 TT |
641 | if (init) { |
642 | /* | |
643 | * Initialise all known extensions relevant to this context, | |
644 | * whether we have found them or not | |
645 | */ | |
646 | for (thisexd = ext_defs, i = 0; i < OSSL_NELEM(ext_defs); | |
647 | i++, thisexd++) { | |
bf5c84f5 TT |
648 | if (thisexd->init != NULL && (thisexd->context & context) != 0 |
649 | && extension_is_relevant(s, thisexd->context, context) | |
650 | && !thisexd->init(s, context)) { | |
f63a17d6 | 651 | /* SSLfatal() already called */ |
735d5b59 TT |
652 | goto err; |
653 | } | |
68db4dda MC |
654 | } |
655 | } | |
656 | ||
6b473aca | 657 | *res = raw_extensions; |
fc5ece2e BK |
658 | if (len != NULL) |
659 | *len = num_exts; | |
6b473aca MC |
660 | return 1; |
661 | ||
662 | err: | |
663 | OPENSSL_free(raw_extensions); | |
664 | return 0; | |
665 | } | |
666 | ||
68db4dda | 667 | /* |
70af3d8e MC |
668 | * Runs the parser for a given extension with index |idx|. |exts| contains the |
669 | * list of all parsed extensions previously collected by | |
670 | * tls_collect_extensions(). The parser is only run if it is applicable for the | |
f97d4c37 MC |
671 | * given |context| and the parser has not already been run. If this is for a |
672 | * Certificate message, then we also provide the parser with the relevant | |
8521ced6 | 673 | * Certificate |x| and its position in the |chainidx| with 0 being the first |
29bfd5b7 MC |
674 | * Certificate. Returns 1 on success or 0 on failure. If an extension is not |
675 | * present this counted as success. | |
68db4dda | 676 | */ |
d270de32 | 677 | int tls_parse_extension(SSL *s, TLSEXT_INDEX idx, int context, |
f63a17d6 | 678 | RAW_EXTENSION *exts, X509 *x, size_t chainidx) |
6b473aca | 679 | { |
70af3d8e | 680 | RAW_EXTENSION *currext = &exts[idx]; |
61138358 | 681 | int (*parser)(SSL *s, PACKET *pkt, unsigned int context, X509 *x, |
f63a17d6 | 682 | size_t chainidx) = NULL; |
6b473aca | 683 | |
70af3d8e MC |
684 | /* Skip if the extension is not present */ |
685 | if (!currext->present) | |
686 | return 1; | |
6b473aca | 687 | |
70af3d8e MC |
688 | /* Skip if we've already parsed this extension */ |
689 | if (currext->parsed) | |
690 | return 1; | |
6b473aca | 691 | |
70af3d8e MC |
692 | currext->parsed = 1; |
693 | ||
694 | if (idx < OSSL_NELEM(ext_defs)) { | |
695 | /* We are handling a built-in extension */ | |
696 | const EXTENSION_DEFINITION *extdef = &ext_defs[idx]; | |
697 | ||
698 | /* Check if extension is defined for our protocol. If not, skip */ | |
699 | if (!extension_is_relevant(s, extdef->context, context)) | |
700 | return 1; | |
701 | ||
1266eefd | 702 | parser = s->server ? extdef->parse_ctos : extdef->parse_stoc; |
224135e9 | 703 | |
1266eefd | 704 | if (parser != NULL) |
f63a17d6 | 705 | return parser(s, &currext->data, context, x, chainidx); |
6b473aca | 706 | |
70af3d8e MC |
707 | /* |
708 | * If the parser is NULL we fall through to the custom extension | |
709 | * processing | |
710 | */ | |
6b473aca MC |
711 | } |
712 | ||
43ae5eed | 713 | /* Parse custom extensions */ |
f63a17d6 MC |
714 | return custom_ext_parse(s, context, currext->type, |
715 | PACKET_data(&currext->data), | |
716 | PACKET_remaining(&currext->data), | |
717 | x, chainidx); | |
805a2e9e MC |
718 | } |
719 | ||
720 | /* | |
721 | * Parse all remaining extensions that have not yet been parsed. Also calls the | |
735d5b59 TT |
722 | * finalisation for all extensions at the end if |fin| is nonzero, whether we |
723 | * collected them or not. Returns 1 for success or 0 for failure. If we are | |
724 | * working on a Certificate message then we also pass the Certificate |x| and | |
29bfd5b7 | 725 | * its position in the |chainidx|, with 0 being the first certificate. |
805a2e9e | 726 | */ |
f97d4c37 | 727 | int tls_parse_all_extensions(SSL *s, int context, RAW_EXTENSION *exts, X509 *x, |
f63a17d6 | 728 | size_t chainidx, int fin) |
805a2e9e | 729 | { |
1266eefd | 730 | size_t i, numexts = OSSL_NELEM(ext_defs); |
d270de32 | 731 | const EXTENSION_DEFINITION *thisexd; |
805a2e9e | 732 | |
70af3d8e | 733 | /* Calculate the number of extensions in the extensions list */ |
43ae5eed | 734 | numexts += s->cert->custext.meths_count; |
70af3d8e MC |
735 | |
736 | /* Parse each extension in turn */ | |
1266eefd | 737 | for (i = 0; i < numexts; i++) { |
f63a17d6 MC |
738 | if (!tls_parse_extension(s, i, context, exts, x, chainidx)) { |
739 | /* SSLfatal() already called */ | |
70af3d8e | 740 | return 0; |
f63a17d6 | 741 | } |
70af3d8e | 742 | } |
805a2e9e | 743 | |
735d5b59 TT |
744 | if (fin) { |
745 | /* | |
746 | * Finalise all known extensions relevant to this context, | |
747 | * whether we have found them or not | |
748 | */ | |
749 | for (i = 0, thisexd = ext_defs; i < OSSL_NELEM(ext_defs); | |
750 | i++, thisexd++) { | |
bf5c84f5 | 751 | if (thisexd->final != NULL && (thisexd->context & context) != 0 |
f63a17d6 MC |
752 | && !thisexd->final(s, context, exts[i].present)) { |
753 | /* SSLfatal() already called */ | |
735d5b59 | 754 | return 0; |
f63a17d6 | 755 | } |
735d5b59 | 756 | } |
68db4dda MC |
757 | } |
758 | ||
6b473aca MC |
759 | return 1; |
760 | } | |
761 | ||
43ae5eed MC |
762 | int should_add_extension(SSL *s, unsigned int extctx, unsigned int thisctx, |
763 | int max_version) | |
764 | { | |
765 | /* Skip if not relevant for our context */ | |
766 | if ((extctx & thisctx) == 0) | |
767 | return 0; | |
768 | ||
769 | /* Check if this extension is defined for our protocol. If not, skip */ | |
ee36b963 | 770 | if (!extension_is_relevant(s, extctx, thisctx) |
43ae5eed MC |
771 | || ((extctx & SSL_EXT_TLS1_3_ONLY) != 0 |
772 | && (thisctx & SSL_EXT_CLIENT_HELLO) != 0 | |
773 | && (SSL_IS_DTLS(s) || max_version < TLS1_3_VERSION))) | |
774 | return 0; | |
775 | ||
776 | return 1; | |
777 | } | |
778 | ||
6b473aca | 779 | /* |
70af3d8e | 780 | * Construct all the extensions relevant to the current |context| and write |
30aeba43 | 781 | * them to |pkt|. If this is an extension for a Certificate in a Certificate |
8521ced6 MC |
782 | * message, then |x| will be set to the Certificate we are handling, and |
783 | * |chainidx| will indicate the position in the chainidx we are processing (with | |
f63a17d6 | 784 | * 0 being the first in the chain). Returns 1 on success or 0 on failure. On a |
8521ced6 | 785 | * failure construction stops at the first extension to fail to construct. |
6b473aca | 786 | */ |
224135e9 | 787 | int tls_construct_extensions(SSL *s, WPACKET *pkt, unsigned int context, |
f63a17d6 | 788 | X509 *x, size_t chainidx) |
224135e9 | 789 | { |
1266eefd | 790 | size_t i; |
f63a17d6 | 791 | int min_version, max_version = 0, reason; |
d270de32 | 792 | const EXTENSION_DEFINITION *thisexd; |
224135e9 MC |
793 | |
794 | if (!WPACKET_start_sub_packet_u16(pkt) | |
795 | /* | |
796 | * If extensions are of zero length then we don't even add the | |
1c259bb5 BK |
797 | * extensions length bytes to a ClientHello/ServerHello |
798 | * (for non-TLSv1.3). | |
224135e9 | 799 | */ |
fe874d27 MC |
800 | || ((context & |
801 | (SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO)) != 0 | |
fe874d27 | 802 | && !WPACKET_set_flags(pkt, |
224135e9 | 803 | WPACKET_FLAGS_ABANDON_ON_ZERO_LENGTH))) { |
c48ffbcc | 804 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
f63a17d6 | 805 | return 0; |
224135e9 MC |
806 | } |
807 | ||
fe874d27 | 808 | if ((context & SSL_EXT_CLIENT_HELLO) != 0) { |
b5b993b2 | 809 | reason = ssl_get_min_max_version(s, &min_version, &max_version, NULL); |
ab83e314 | 810 | if (reason != 0) { |
c48ffbcc | 811 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, reason); |
f63a17d6 | 812 | return 0; |
ab83e314 MC |
813 | } |
814 | } | |
815 | ||
816 | /* Add custom extensions first */ | |
fe874d27 | 817 | if ((context & SSL_EXT_CLIENT_HELLO) != 0) { |
44e69951 | 818 | /* On the server side with initialise during ClientHello parsing */ |
43ae5eed | 819 | custom_ext_init(&s->cert->custext); |
ab83e314 | 820 | } |
f63a17d6 MC |
821 | if (!custom_ext_add(s, context, pkt, x, chainidx, max_version)) { |
822 | /* SSLfatal() already called */ | |
823 | return 0; | |
ab83e314 MC |
824 | } |
825 | ||
1266eefd | 826 | for (i = 0, thisexd = ext_defs; i < OSSL_NELEM(ext_defs); i++, thisexd++) { |
b186a592 | 827 | EXT_RETURN (*construct)(SSL *s, WPACKET *pkt, unsigned int context, |
f63a17d6 | 828 | X509 *x, size_t chainidx); |
b186a592 | 829 | EXT_RETURN ret; |
4b299b8e | 830 | |
224135e9 | 831 | /* Skip if not relevant for our context */ |
43ae5eed | 832 | if (!should_add_extension(s, thisexd->context, context, max_version)) |
224135e9 MC |
833 | continue; |
834 | ||
1266eefd MC |
835 | construct = s->server ? thisexd->construct_stoc |
836 | : thisexd->construct_ctos; | |
224135e9 | 837 | |
43ae5eed | 838 | if (construct == NULL) |
224135e9 MC |
839 | continue; |
840 | ||
f63a17d6 MC |
841 | ret = construct(s, pkt, context, x, chainidx); |
842 | if (ret == EXT_RETURN_FAIL) { | |
843 | /* SSLfatal() already called */ | |
844 | return 0; | |
845 | } | |
b186a592 MC |
846 | if (ret == EXT_RETURN_SENT |
847 | && (context & (SSL_EXT_CLIENT_HELLO | |
848 | | SSL_EXT_TLS1_3_CERTIFICATE_REQUEST | |
849 | | SSL_EXT_TLS1_3_NEW_SESSION_TICKET)) != 0) | |
850 | s->ext.extflags[i] |= SSL_EXT_FLAG_SENT; | |
224135e9 MC |
851 | } |
852 | ||
224135e9 | 853 | if (!WPACKET_close(pkt)) { |
c48ffbcc | 854 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
f63a17d6 | 855 | return 0; |
224135e9 MC |
856 | } |
857 | ||
858 | return 1; | |
859 | } | |
805a2e9e | 860 | |
70af3d8e MC |
861 | /* |
862 | * Built in extension finalisation and initialisation functions. All initialise | |
863 | * or finalise the associated extension type for the given |context|. For | |
864 | * finalisers |sent| is set to 1 if we saw the extension during parsing, and 0 | |
29bfd5b7 | 865 | * otherwise. These functions return 1 on success or 0 on failure. |
70af3d8e MC |
866 | */ |
867 | ||
f63a17d6 | 868 | static int final_renegotiate(SSL *s, unsigned int context, int sent) |
805a2e9e | 869 | { |
332eb390 MC |
870 | if (!s->server) { |
871 | /* | |
872 | * Check if we can connect to a server that doesn't support safe | |
873 | * renegotiation | |
874 | */ | |
875 | if (!(s->options & SSL_OP_LEGACY_SERVER_CONNECT) | |
876 | && !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION) | |
877 | && !sent) { | |
c48ffbcc | 878 | SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE, |
f63a17d6 | 879 | SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED); |
332eb390 MC |
880 | return 0; |
881 | } | |
882 | ||
805a2e9e | 883 | return 1; |
332eb390 | 884 | } |
805a2e9e MC |
885 | |
886 | /* Need RI if renegotiating */ | |
887 | if (s->renegotiate | |
888 | && !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION) | |
889 | && !sent) { | |
c48ffbcc | 890 | SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE, |
f63a17d6 | 891 | SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED); |
805a2e9e MC |
892 | return 0; |
893 | } | |
894 | ||
332eb390 | 895 | |
805a2e9e MC |
896 | return 1; |
897 | } | |
898 | ||
acce0557 P |
899 | static ossl_inline void ssl_tsan_decr(const SSL_CTX *ctx, |
900 | TSAN_QUALIFIER int *stat) | |
901 | { | |
902 | if (ssl_tsan_lock(ctx)) { | |
903 | tsan_decr(stat); | |
904 | ssl_tsan_unlock(ctx); | |
905 | } | |
906 | } | |
907 | ||
1266eefd | 908 | static int init_server_name(SSL *s, unsigned int context) |
805a2e9e | 909 | { |
f01344cb | 910 | if (s->server) { |
805a2e9e MC |
911 | s->servername_done = 0; |
912 | ||
f01344cb MC |
913 | OPENSSL_free(s->ext.hostname); |
914 | s->ext.hostname = NULL; | |
915 | } | |
916 | ||
805a2e9e MC |
917 | return 1; |
918 | } | |
919 | ||
f63a17d6 | 920 | static int final_server_name(SSL *s, unsigned int context, int sent) |
805a2e9e | 921 | { |
9ef9088c | 922 | int ret = SSL_TLSEXT_ERR_NOACK; |
805a2e9e | 923 | int altmp = SSL_AD_UNRECOGNIZED_NAME; |
a84e5c9a | 924 | int was_ticket = (SSL_get_options(s) & SSL_OP_NO_TICKET) == 0; |
805a2e9e | 925 | |
c4715212 | 926 | if (!ossl_assert(s->ctx != NULL) || !ossl_assert(s->session_ctx != NULL)) { |
c48ffbcc | 927 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
c4715212 MC |
928 | return 0; |
929 | } | |
930 | ||
931 | if (s->ctx->ext.servername_cb != NULL) | |
aff8c126 RS |
932 | ret = s->ctx->ext.servername_cb(s, &altmp, |
933 | s->ctx->ext.servername_arg); | |
c4715212 | 934 | else if (s->session_ctx->ext.servername_cb != NULL) |
222da979 TS |
935 | ret = s->session_ctx->ext.servername_cb(s, &altmp, |
936 | s->session_ctx->ext.servername_arg); | |
805a2e9e | 937 | |
1c4aa31d BK |
938 | /* |
939 | * For servers, propagate the SNI hostname from the temporary | |
940 | * storage in the SSL to the persistent SSL_SESSION, now that we | |
941 | * know we accepted it. | |
942 | * Clients make this copy when parsing the server's response to | |
943 | * the extension, which is when they find out that the negotiation | |
944 | * was successful. | |
945 | */ | |
946 | if (s->server) { | |
2a538551 | 947 | if (sent && ret == SSL_TLSEXT_ERR_OK && !s->hit) { |
1c4aa31d BK |
948 | /* Only store the hostname in the session if we accepted it. */ |
949 | OPENSSL_free(s->session->ext.hostname); | |
950 | s->session->ext.hostname = OPENSSL_strdup(s->ext.hostname); | |
951 | if (s->session->ext.hostname == NULL && s->ext.hostname != NULL) { | |
c48ffbcc | 952 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
1c4aa31d BK |
953 | } |
954 | } | |
9fb6cb81 MC |
955 | } |
956 | ||
3be08e30 BK |
957 | /* |
958 | * If we switched contexts (whether here or in the client_hello callback), | |
959 | * move the sess_accept increment from the session_ctx to the new | |
960 | * context, to avoid the confusing situation of having sess_accept_good | |
961 | * exceed sess_accept (zero) for the new context. | |
962 | */ | |
42141197 | 963 | if (SSL_IS_FIRST_HANDSHAKE(s) && s->ctx != s->session_ctx |
2d6f72aa | 964 | && s->hello_retry_request == SSL_HRR_NONE) { |
acce0557 P |
965 | ssl_tsan_counter(s->ctx, &s->ctx->stats.sess_accept); |
966 | ssl_tsan_decr(s->session_ctx, &s->session_ctx->stats.sess_accept); | |
3be08e30 BK |
967 | } |
968 | ||
a84e5c9a TS |
969 | /* |
970 | * If we're expecting to send a ticket, and tickets were previously enabled, | |
971 | * and now tickets are disabled, then turn off expected ticket. | |
972 | * Also, if this is not a resumption, create a new session ID | |
973 | */ | |
974 | if (ret == SSL_TLSEXT_ERR_OK && s->ext.ticket_expected | |
975 | && was_ticket && (SSL_get_options(s) & SSL_OP_NO_TICKET) != 0) { | |
976 | s->ext.ticket_expected = 0; | |
977 | if (!s->hit) { | |
978 | SSL_SESSION* ss = SSL_get_session(s); | |
979 | ||
980 | if (ss != NULL) { | |
981 | OPENSSL_free(ss->ext.tick); | |
982 | ss->ext.tick = NULL; | |
983 | ss->ext.ticklen = 0; | |
984 | ss->ext.tick_lifetime_hint = 0; | |
985 | ss->ext.tick_age_add = 0; | |
a84e5c9a | 986 | if (!ssl_generate_session_id(s, ss)) { |
c48ffbcc | 987 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
f63a17d6 | 988 | return 0; |
a84e5c9a TS |
989 | } |
990 | } else { | |
c48ffbcc | 991 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
f63a17d6 | 992 | return 0; |
a84e5c9a TS |
993 | } |
994 | } | |
995 | } | |
996 | ||
805a2e9e MC |
997 | switch (ret) { |
998 | case SSL_TLSEXT_ERR_ALERT_FATAL: | |
c48ffbcc | 999 | SSLfatal(s, altmp, SSL_R_CALLBACK_FAILED); |
805a2e9e MC |
1000 | return 0; |
1001 | ||
1002 | case SSL_TLSEXT_ERR_ALERT_WARNING: | |
fb62e47c MC |
1003 | /* TLSv1.3 doesn't have warning alerts so we suppress this */ |
1004 | if (!SSL_IS_TLS13(s)) | |
1005 | ssl3_send_alert(s, SSL3_AL_WARNING, altmp); | |
cd624ccd | 1006 | s->servername_done = 0; |
805a2e9e MC |
1007 | return 1; |
1008 | ||
1009 | case SSL_TLSEXT_ERR_NOACK: | |
1010 | s->servername_done = 0; | |
1011 | return 1; | |
1012 | ||
1013 | default: | |
1014 | return 1; | |
1015 | } | |
1016 | } | |
1017 | ||
f63a17d6 | 1018 | static int final_ec_pt_formats(SSL *s, unsigned int context, int sent) |
332eb390 MC |
1019 | { |
1020 | unsigned long alg_k, alg_a; | |
1021 | ||
1022 | if (s->server) | |
1023 | return 1; | |
1024 | ||
555cbb32 TS |
1025 | alg_k = s->s3.tmp.new_cipher->algorithm_mkey; |
1026 | alg_a = s->s3.tmp.new_cipher->algorithm_auth; | |
332eb390 MC |
1027 | |
1028 | /* | |
1029 | * If we are client and using an elliptic curve cryptography cipher | |
1030 | * suite, then if server returns an EC point formats lists extension it | |
1031 | * must contain uncompressed. | |
1032 | */ | |
aff8c126 RS |
1033 | if (s->ext.ecpointformats != NULL |
1034 | && s->ext.ecpointformats_len > 0 | |
cd0fb43c MC |
1035 | && s->ext.peer_ecpointformats != NULL |
1036 | && s->ext.peer_ecpointformats_len > 0 | |
1266eefd | 1037 | && ((alg_k & SSL_kECDHE) || (alg_a & SSL_aECDSA))) { |
332eb390 MC |
1038 | /* we are using an ECC cipher */ |
1039 | size_t i; | |
cd0fb43c | 1040 | unsigned char *list = s->ext.peer_ecpointformats; |
1266eefd | 1041 | |
cd0fb43c | 1042 | for (i = 0; i < s->ext.peer_ecpointformats_len; i++) { |
1266eefd | 1043 | if (*list++ == TLSEXT_ECPOINTFORMAT_uncompressed) |
332eb390 | 1044 | break; |
332eb390 | 1045 | } |
cd0fb43c | 1046 | if (i == s->ext.peer_ecpointformats_len) { |
c48ffbcc | 1047 | SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, |
f63a17d6 | 1048 | SSL_R_TLS_INVALID_ECPOINTFORMAT_LIST); |
332eb390 MC |
1049 | return 0; |
1050 | } | |
1051 | } | |
1052 | ||
1053 | return 1; | |
1054 | } | |
332eb390 | 1055 | |
1266eefd | 1056 | static int init_session_ticket(SSL *s, unsigned int context) |
332eb390 MC |
1057 | { |
1058 | if (!s->server) | |
aff8c126 | 1059 | s->ext.ticket_expected = 0; |
332eb390 MC |
1060 | |
1061 | return 1; | |
1062 | } | |
1063 | ||
8f8c11d8 | 1064 | #ifndef OPENSSL_NO_OCSP |
1266eefd | 1065 | static int init_status_request(SSL *s, unsigned int context) |
805a2e9e | 1066 | { |
f63e4288 | 1067 | if (s->server) { |
aff8c126 | 1068 | s->ext.status_type = TLSEXT_STATUSTYPE_nothing; |
f63e4288 MC |
1069 | } else { |
1070 | /* | |
1071 | * Ensure we get sensible values passed to tlsext_status_cb in the event | |
1072 | * that we don't receive a status message | |
1073 | */ | |
8cbfcc70 RS |
1074 | OPENSSL_free(s->ext.ocsp.resp); |
1075 | s->ext.ocsp.resp = NULL; | |
1076 | s->ext.ocsp.resp_len = 0; | |
f63e4288 | 1077 | } |
332eb390 MC |
1078 | |
1079 | return 1; | |
1080 | } | |
8f8c11d8 | 1081 | #endif |
332eb390 | 1082 | |
805a2e9e | 1083 | #ifndef OPENSSL_NO_NEXTPROTONEG |
1266eefd | 1084 | static int init_npn(SSL *s, unsigned int context) |
805a2e9e | 1085 | { |
555cbb32 | 1086 | s->s3.npn_seen = 0; |
805a2e9e MC |
1087 | |
1088 | return 1; | |
1089 | } | |
1090 | #endif | |
1091 | ||
1266eefd | 1092 | static int init_alpn(SSL *s, unsigned int context) |
805a2e9e | 1093 | { |
555cbb32 TS |
1094 | OPENSSL_free(s->s3.alpn_selected); |
1095 | s->s3.alpn_selected = NULL; | |
1096 | s->s3.alpn_selected_len = 0; | |
805a2e9e | 1097 | if (s->server) { |
555cbb32 TS |
1098 | OPENSSL_free(s->s3.alpn_proposed); |
1099 | s->s3.alpn_proposed = NULL; | |
1100 | s->s3.alpn_proposed_len = 0; | |
805a2e9e | 1101 | } |
805a2e9e MC |
1102 | return 1; |
1103 | } | |
1104 | ||
f63a17d6 | 1105 | static int final_alpn(SSL *s, unsigned int context, int sent) |
630369d9 | 1106 | { |
4be3a7c7 MC |
1107 | if (!s->server && !sent && s->session->ext.alpn_selected != NULL) |
1108 | s->ext.early_data_ok = 0; | |
1109 | ||
630369d9 MC |
1110 | if (!s->server || !SSL_IS_TLS13(s)) |
1111 | return 1; | |
1112 | ||
1113 | /* | |
1114 | * Call alpn_select callback if needed. Has to be done after SNI and | |
1115 | * cipher negotiation (HTTP/2 restricts permitted ciphers). In TLSv1.3 | |
1116 | * we also have to do this before we decide whether to accept early_data. | |
1117 | * In TLSv1.3 we've already negotiated our cipher so we do this call now. | |
1118 | * For < TLSv1.3 we defer it until after cipher negotiation. | |
56d36288 | 1119 | * |
f63a17d6 | 1120 | * On failure SSLfatal() already called. |
630369d9 | 1121 | */ |
f63a17d6 | 1122 | return tls_handle_alpn(s); |
630369d9 MC |
1123 | } |
1124 | ||
1266eefd | 1125 | static int init_sig_algs(SSL *s, unsigned int context) |
805a2e9e MC |
1126 | { |
1127 | /* Clear any signature algorithms extension received */ | |
555cbb32 TS |
1128 | OPENSSL_free(s->s3.tmp.peer_sigalgs); |
1129 | s->s3.tmp.peer_sigalgs = NULL; | |
02b1636f | 1130 | s->s3.tmp.peer_sigalgslen = 0; |
805a2e9e MC |
1131 | |
1132 | return 1; | |
1133 | } | |
1134 | ||
a7e6a3d8 | 1135 | static int init_sig_algs_cert(SSL *s, ossl_unused unsigned int context) |
c589c34e BK |
1136 | { |
1137 | /* Clear any signature algorithms extension received */ | |
555cbb32 TS |
1138 | OPENSSL_free(s->s3.tmp.peer_cert_sigalgs); |
1139 | s->s3.tmp.peer_cert_sigalgs = NULL; | |
39a14059 | 1140 | s->s3.tmp.peer_cert_sigalgslen = 0; |
c589c34e BK |
1141 | |
1142 | return 1; | |
1143 | } | |
1144 | ||
805a2e9e | 1145 | #ifndef OPENSSL_NO_SRP |
1266eefd | 1146 | static int init_srp(SSL *s, unsigned int context) |
805a2e9e MC |
1147 | { |
1148 | OPENSSL_free(s->srp_ctx.login); | |
1149 | s->srp_ctx.login = NULL; | |
1150 | ||
1151 | return 1; | |
1152 | } | |
1153 | #endif | |
1154 | ||
3f987381 DB |
1155 | static int init_ec_point_formats(SSL *s, unsigned int context) |
1156 | { | |
1157 | OPENSSL_free(s->ext.peer_ecpointformats); | |
1158 | s->ext.peer_ecpointformats = NULL; | |
1159 | s->ext.peer_ecpointformats_len = 0; | |
1160 | ||
1161 | return 1; | |
1162 | } | |
1163 | ||
1266eefd | 1164 | static int init_etm(SSL *s, unsigned int context) |
805a2e9e | 1165 | { |
28a31a0a | 1166 | s->ext.use_etm = 0; |
332eb390 MC |
1167 | |
1168 | return 1; | |
1169 | } | |
1170 | ||
1266eefd | 1171 | static int init_ems(SSL *s, unsigned int context) |
332eb390 | 1172 | { |
11d3235e TM |
1173 | if (s->s3.flags & TLS1_FLAGS_RECEIVED_EXTMS) { |
1174 | s->s3.flags &= ~TLS1_FLAGS_RECEIVED_EXTMS; | |
1175 | s->s3.flags |= TLS1_FLAGS_REQUIRED_EXTMS; | |
1176 | } | |
332eb390 MC |
1177 | |
1178 | return 1; | |
1179 | } | |
1180 | ||
f63a17d6 | 1181 | static int final_ems(SSL *s, unsigned int context, int sent) |
332eb390 | 1182 | { |
11d3235e TM |
1183 | /* |
1184 | * Check extended master secret extension is not dropped on | |
1185 | * renegotiation. | |
1186 | */ | |
1187 | if (!(s->s3.flags & TLS1_FLAGS_RECEIVED_EXTMS) | |
1188 | && (s->s3.flags & TLS1_FLAGS_REQUIRED_EXTMS)) { | |
c48ffbcc | 1189 | SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE, SSL_R_INCONSISTENT_EXTMS); |
11d3235e TM |
1190 | return 0; |
1191 | } | |
332eb390 MC |
1192 | if (!s->server && s->hit) { |
1193 | /* | |
1194 | * Check extended master secret extension is consistent with | |
1195 | * original session. | |
1196 | */ | |
555cbb32 | 1197 | if (!(s->s3.flags & TLS1_FLAGS_RECEIVED_EXTMS) != |
332eb390 | 1198 | !(s->session->flags & SSL_SESS_FLAG_EXTMS)) { |
c48ffbcc | 1199 | SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE, SSL_R_INCONSISTENT_EXTMS); |
332eb390 MC |
1200 | return 0; |
1201 | } | |
1202 | } | |
805a2e9e MC |
1203 | |
1204 | return 1; | |
1205 | } | |
1206 | ||
45615c5f DSH |
1207 | static int init_certificate_authorities(SSL *s, unsigned int context) |
1208 | { | |
555cbb32 TS |
1209 | sk_X509_NAME_pop_free(s->s3.tmp.peer_ca_names, X509_NAME_free); |
1210 | s->s3.tmp.peer_ca_names = NULL; | |
45615c5f DSH |
1211 | return 1; |
1212 | } | |
1213 | ||
b186a592 MC |
1214 | static EXT_RETURN tls_construct_certificate_authorities(SSL *s, WPACKET *pkt, |
1215 | unsigned int context, | |
1216 | X509 *x, | |
f63a17d6 | 1217 | size_t chainidx) |
45615c5f | 1218 | { |
98732979 | 1219 | const STACK_OF(X509_NAME) *ca_sk = get_ca_names(s); |
45615c5f DSH |
1220 | |
1221 | if (ca_sk == NULL || sk_X509_NAME_num(ca_sk) == 0) | |
b186a592 | 1222 | return EXT_RETURN_NOT_SENT; |
45615c5f DSH |
1223 | |
1224 | if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_certificate_authorities) | |
f63a17d6 | 1225 | || !WPACKET_start_sub_packet_u16(pkt)) { |
c48ffbcc | 1226 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
b186a592 | 1227 | return EXT_RETURN_FAIL; |
45615c5f DSH |
1228 | } |
1229 | ||
98732979 | 1230 | if (!construct_ca_names(s, ca_sk, pkt)) { |
f63a17d6 MC |
1231 | /* SSLfatal() already called */ |
1232 | return EXT_RETURN_FAIL; | |
1233 | } | |
1234 | ||
1235 | if (!WPACKET_close(pkt)) { | |
c48ffbcc | 1236 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
f63a17d6 MC |
1237 | return EXT_RETURN_FAIL; |
1238 | } | |
1239 | ||
b186a592 | 1240 | return EXT_RETURN_SENT; |
45615c5f DSH |
1241 | } |
1242 | ||
1243 | static int tls_parse_certificate_authorities(SSL *s, PACKET *pkt, | |
1244 | unsigned int context, X509 *x, | |
f63a17d6 | 1245 | size_t chainidx) |
45615c5f | 1246 | { |
f63a17d6 | 1247 | if (!parse_ca_names(s, pkt)) |
45615c5f DSH |
1248 | return 0; |
1249 | if (PACKET_remaining(pkt) != 0) { | |
c48ffbcc | 1250 | SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_R_BAD_EXTENSION); |
45615c5f DSH |
1251 | return 0; |
1252 | } | |
1253 | return 1; | |
1254 | } | |
1255 | ||
805a2e9e | 1256 | #ifndef OPENSSL_NO_SRTP |
1266eefd | 1257 | static int init_srtp(SSL *s, unsigned int context) |
805a2e9e MC |
1258 | { |
1259 | if (s->server) | |
1260 | s->srtp_profile = NULL; | |
1261 | ||
1262 | return 1; | |
1263 | } | |
1264 | #endif | |
04904312 | 1265 | |
f63a17d6 | 1266 | static int final_sig_algs(SSL *s, unsigned int context, int sent) |
04904312 | 1267 | { |
108d45df | 1268 | if (!sent && SSL_IS_TLS13(s) && !s->hit) { |
c48ffbcc | 1269 | SSLfatal(s, TLS13_AD_MISSING_EXTENSION, |
f63a17d6 | 1270 | SSL_R_MISSING_SIGALGS_EXTENSION); |
04904312 MC |
1271 | return 0; |
1272 | } | |
1273 | ||
1274 | return 1; | |
1275 | } | |
b2f7e8c0 | 1276 | |
f63a17d6 | 1277 | static int final_key_share(SSL *s, unsigned int context, int sent) |
f4bbb37c | 1278 | { |
65dc5c3c | 1279 | #if !defined(OPENSSL_NO_TLS1_3) |
f4bbb37c MC |
1280 | if (!SSL_IS_TLS13(s)) |
1281 | return 1; | |
1282 | ||
07d447a6 MC |
1283 | /* Nothing to do for key_share in an HRR */ |
1284 | if ((context & SSL_EXT_TLS1_3_HELLO_RETRY_REQUEST) != 0) | |
1285 | return 1; | |
1286 | ||
f4bbb37c MC |
1287 | /* |
1288 | * If | |
aff9929b MC |
1289 | * we are a client |
1290 | * AND | |
f4bbb37c MC |
1291 | * we have no key_share |
1292 | * AND | |
1293 | * (we are not resuming | |
1294 | * OR the kex_mode doesn't allow non key_share resumes) | |
1295 | * THEN | |
aff9929b | 1296 | * fail; |
f4bbb37c | 1297 | */ |
aff9929b MC |
1298 | if (!s->server |
1299 | && !sent | |
f4bbb37c MC |
1300 | && (!s->hit |
1301 | || (s->ext.psk_kex_mode & TLSEXT_KEX_MODE_FLAG_KE) == 0)) { | |
7d061fce | 1302 | /* Nothing left we can do - just fail */ |
c48ffbcc | 1303 | SSLfatal(s, SSL_AD_MISSING_EXTENSION, SSL_R_NO_SUITABLE_KEY_SHARE); |
f4bbb37c MC |
1304 | return 0; |
1305 | } | |
aff9929b | 1306 | /* |
c36001c3 | 1307 | * IF |
aff9929b | 1308 | * we are a server |
aff9929b | 1309 | * THEN |
c36001c3 MC |
1310 | * IF |
1311 | * we have a suitable key_share | |
aff9929b | 1312 | * THEN |
c36001c3 MC |
1313 | * IF |
1314 | * we are stateless AND we have no cookie | |
1315 | * THEN | |
1316 | * send a HelloRetryRequest | |
1317 | * ELSE | |
1318 | * IF | |
1319 | * we didn't already send a HelloRetryRequest | |
1320 | * AND | |
1321 | * the client sent a key_share extension | |
1322 | * AND | |
1323 | * (we are not resuming | |
1324 | * OR the kex_mode allows key_share resumes) | |
1325 | * AND | |
1326 | * a shared group exists | |
1327 | * THEN | |
1328 | * send a HelloRetryRequest | |
1329 | * ELSE IF | |
1330 | * we are not resuming | |
1331 | * OR | |
1332 | * the kex_mode doesn't allow non key_share resumes | |
1333 | * THEN | |
1334 | * fail | |
1335 | * ELSE IF | |
1336 | * we are stateless AND we have no cookie | |
1337 | * THEN | |
1338 | * send a HelloRetryRequest | |
aff9929b | 1339 | */ |
c36001c3 | 1340 | if (s->server) { |
555cbb32 | 1341 | if (s->s3.peer_tmp != NULL) { |
c36001c3 | 1342 | /* We have a suitable key_share */ |
555cbb32 | 1343 | if ((s->s3.flags & TLS1_FLAGS_STATELESS) != 0 |
c36001c3 MC |
1344 | && !s->ext.cookieok) { |
1345 | if (!ossl_assert(s->hello_retry_request == SSL_HRR_NONE)) { | |
1346 | /* | |
1347 | * If we are stateless then we wouldn't know about any | |
1348 | * previously sent HRR - so how can this be anything other | |
1349 | * than 0? | |
1350 | */ | |
c48ffbcc | 1351 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
c36001c3 MC |
1352 | return 0; |
1353 | } | |
1354 | s->hello_retry_request = SSL_HRR_PENDING; | |
1355 | return 1; | |
1356 | } | |
1357 | } else { | |
1358 | /* No suitable key_share */ | |
1359 | if (s->hello_retry_request == SSL_HRR_NONE && sent | |
1360 | && (!s->hit | |
1361 | || (s->ext.psk_kex_mode & TLSEXT_KEX_MODE_FLAG_KE_DHE) | |
1362 | != 0)) { | |
1363 | const uint16_t *pgroups, *clntgroups; | |
1364 | size_t num_groups, clnt_num_groups, i; | |
1365 | unsigned int group_id = 0; | |
1366 | ||
1367 | /* Check if a shared group exists */ | |
1368 | ||
1369 | /* Get the clients list of supported groups. */ | |
1370 | tls1_get_peer_groups(s, &clntgroups, &clnt_num_groups); | |
1371 | tls1_get_supported_groups(s, &pgroups, &num_groups); | |
1372 | ||
1373 | /* | |
1374 | * Find the first group we allow that is also in client's list | |
1375 | */ | |
1376 | for (i = 0; i < num_groups; i++) { | |
1377 | group_id = pgroups[i]; | |
1378 | ||
1379 | if (check_in_list(s, group_id, clntgroups, clnt_num_groups, | |
0a10825a | 1380 | 2)) |
c36001c3 MC |
1381 | break; |
1382 | } | |
1383 | ||
1384 | if (i < num_groups) { | |
1385 | /* A shared group exists so send a HelloRetryRequest */ | |
555cbb32 | 1386 | s->s3.group_id = group_id; |
c36001c3 MC |
1387 | s->hello_retry_request = SSL_HRR_PENDING; |
1388 | return 1; | |
1389 | } | |
1390 | } | |
1391 | if (!s->hit | |
1392 | || (s->ext.psk_kex_mode & TLSEXT_KEX_MODE_FLAG_KE) == 0) { | |
1393 | /* Nothing left we can do - just fail */ | |
1394 | SSLfatal(s, sent ? SSL_AD_HANDSHAKE_FAILURE | |
1395 | : SSL_AD_MISSING_EXTENSION, | |
c48ffbcc | 1396 | SSL_R_NO_SUITABLE_KEY_SHARE); |
c36001c3 | 1397 | return 0; |
aff9929b MC |
1398 | } |
1399 | ||
555cbb32 | 1400 | if ((s->s3.flags & TLS1_FLAGS_STATELESS) != 0 |
c36001c3 MC |
1401 | && !s->ext.cookieok) { |
1402 | if (!ossl_assert(s->hello_retry_request == SSL_HRR_NONE)) { | |
1403 | /* | |
1404 | * If we are stateless then we wouldn't know about any | |
1405 | * previously sent HRR - so how can this be anything other | |
1406 | * than 0? | |
1407 | */ | |
c48ffbcc | 1408 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
c36001c3 MC |
1409 | return 0; |
1410 | } | |
fc7129dc | 1411 | s->hello_retry_request = SSL_HRR_PENDING; |
aff9929b MC |
1412 | return 1; |
1413 | } | |
1414 | } | |
c36001c3 MC |
1415 | |
1416 | /* | |
1417 | * We have a key_share so don't send any more HelloRetryRequest | |
1418 | * messages | |
1419 | */ | |
1420 | if (s->hello_retry_request == SSL_HRR_PENDING) | |
1421 | s->hello_retry_request = SSL_HRR_COMPLETE; | |
1422 | } else { | |
1423 | /* | |
1424 | * For a client side resumption with no key_share we need to generate | |
1425 | * the handshake secret (otherwise this is done during key_share | |
1426 | * processing). | |
1427 | */ | |
1428 | if (!sent && !tls13_generate_handshake_secret(s, NULL, 0)) { | |
c48ffbcc | 1429 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
aff9929b MC |
1430 | return 0; |
1431 | } | |
1432 | } | |
65dc5c3c | 1433 | #endif /* !defined(OPENSSL_NO_TLS1_3) */ |
f4bbb37c MC |
1434 | return 1; |
1435 | } | |
1436 | ||
b2f7e8c0 MC |
1437 | static int init_psk_kex_modes(SSL *s, unsigned int context) |
1438 | { | |
1439 | s->ext.psk_kex_mode = TLSEXT_KEX_MODE_FLAG_NONE; | |
b2f7e8c0 MC |
1440 | return 1; |
1441 | } | |
1053a6e2 MC |
1442 | |
1443 | int tls_psk_do_binder(SSL *s, const EVP_MD *md, const unsigned char *msgstart, | |
1444 | size_t binderoffset, const unsigned char *binderin, | |
3a7c56b2 MC |
1445 | unsigned char *binderout, SSL_SESSION *sess, int sign, |
1446 | int external) | |
1053a6e2 MC |
1447 | { |
1448 | EVP_PKEY *mackey = NULL; | |
1449 | EVP_MD_CTX *mctx = NULL; | |
1450 | unsigned char hash[EVP_MAX_MD_SIZE], binderkey[EVP_MAX_MD_SIZE]; | |
1451 | unsigned char finishedkey[EVP_MAX_MD_SIZE], tmpbinder[EVP_MAX_MD_SIZE]; | |
4ff1a526 | 1452 | unsigned char *early_secret; |
48102247 | 1453 | #ifdef CHARSET_EBCDIC |
6ed12cec | 1454 | static const unsigned char resumption_label[] = { 0x72, 0x65, 0x73, 0x20, 0x62, 0x69, 0x6E, 0x64, 0x65, 0x72, 0x00 }; |
48102247 | 1455 | static const unsigned char external_label[] = { 0x65, 0x78, 0x74, 0x20, 0x62, 0x69, 0x6E, 0x64, 0x65, 0x72, 0x00 }; |
1456 | #else | |
4ff1a526 MC |
1457 | static const unsigned char resumption_label[] = "res binder"; |
1458 | static const unsigned char external_label[] = "ext binder"; | |
48102247 | 1459 | #endif |
4ff1a526 MC |
1460 | const unsigned char *label; |
1461 | size_t bindersize, labelsize, hashsize; | |
ed576acd | 1462 | int hashsizei = EVP_MD_get_size(md); |
1053a6e2 | 1463 | int ret = -1; |
add8d0e9 MC |
1464 | int usepskfored = 0; |
1465 | ||
bceae201 MC |
1466 | /* Ensure cast to size_t is safe */ |
1467 | if (!ossl_assert(hashsizei >= 0)) { | |
c48ffbcc | 1468 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
bceae201 MC |
1469 | goto err; |
1470 | } | |
1471 | hashsize = (size_t)hashsizei; | |
1472 | ||
add8d0e9 MC |
1473 | if (external |
1474 | && s->early_data_state == SSL_EARLY_DATA_CONNECTING | |
1475 | && s->session->ext.max_early_data == 0 | |
1476 | && sess->ext.max_early_data > 0) | |
1477 | usepskfored = 1; | |
1053a6e2 | 1478 | |
3a7c56b2 MC |
1479 | if (external) { |
1480 | label = external_label; | |
1481 | labelsize = sizeof(external_label) - 1; | |
1482 | } else { | |
1483 | label = resumption_label; | |
1484 | labelsize = sizeof(resumption_label) - 1; | |
1485 | } | |
1486 | ||
9368f865 MC |
1487 | /* |
1488 | * Generate the early_secret. On the server side we've selected a PSK to | |
1489 | * resume with (internal or external) so we always do this. On the client | |
add8d0e9 MC |
1490 | * side we do this for a non-external (i.e. resumption) PSK or external PSK |
1491 | * that will be used for early_data so that it is in place for sending early | |
1492 | * data. For client side external PSK not being used for early_data we | |
9368f865 MC |
1493 | * generate it but store it away for later use. |
1494 | */ | |
add8d0e9 | 1495 | if (s->server || !external || usepskfored) |
9368f865 MC |
1496 | early_secret = (unsigned char *)s->early_secret; |
1497 | else | |
1498 | early_secret = (unsigned char *)sess->early_secret; | |
4ff1a526 MC |
1499 | |
1500 | if (!tls13_generate_secret(s, md, NULL, sess->master_key, | |
1501 | sess->master_key_length, early_secret)) { | |
635c8f77 | 1502 | /* SSLfatal() already called */ |
1053a6e2 MC |
1503 | goto err; |
1504 | } | |
1505 | ||
1506 | /* | |
1507 | * Create the handshake hash for the binder key...the messages so far are | |
1508 | * empty! | |
1509 | */ | |
1510 | mctx = EVP_MD_CTX_new(); | |
1511 | if (mctx == NULL | |
1512 | || EVP_DigestInit_ex(mctx, md, NULL) <= 0 | |
1513 | || EVP_DigestFinal_ex(mctx, hash, NULL) <= 0) { | |
c48ffbcc | 1514 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
1053a6e2 MC |
1515 | goto err; |
1516 | } | |
1517 | ||
1518 | /* Generate the binder key */ | |
4ff1a526 | 1519 | if (!tls13_hkdf_expand(s, md, early_secret, label, labelsize, hash, |
0fb2815b | 1520 | hashsize, binderkey, hashsize, 1)) { |
635c8f77 | 1521 | /* SSLfatal() already called */ |
1053a6e2 MC |
1522 | goto err; |
1523 | } | |
1524 | ||
1525 | /* Generate the finished key */ | |
1526 | if (!tls13_derive_finishedkey(s, md, binderkey, finishedkey, hashsize)) { | |
635c8f77 | 1527 | /* SSLfatal() already called */ |
1053a6e2 MC |
1528 | goto err; |
1529 | } | |
1530 | ||
aff9929b | 1531 | if (EVP_DigestInit_ex(mctx, md, NULL) <= 0) { |
c48ffbcc | 1532 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
aff9929b MC |
1533 | goto err; |
1534 | } | |
1535 | ||
1053a6e2 | 1536 | /* |
aff9929b MC |
1537 | * Get a hash of the ClientHello up to the start of the binders. If we are |
1538 | * following a HelloRetryRequest then this includes the hash of the first | |
1539 | * ClientHello and the HelloRetryRequest itself. | |
1053a6e2 | 1540 | */ |
fc7129dc | 1541 | if (s->hello_retry_request == SSL_HRR_PENDING) { |
aff9929b | 1542 | size_t hdatalen; |
60690b5b | 1543 | long hdatalen_l; |
aff9929b MC |
1544 | void *hdata; |
1545 | ||
60690b5b | 1546 | hdatalen = hdatalen_l = |
555cbb32 | 1547 | BIO_get_mem_data(s->s3.handshake_buffer, &hdata); |
60690b5b | 1548 | if (hdatalen_l <= 0) { |
c48ffbcc | 1549 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_R_BAD_HANDSHAKE_LENGTH); |
aff9929b MC |
1550 | goto err; |
1551 | } | |
1552 | ||
1553 | /* | |
1554 | * For servers the handshake buffer data will include the second | |
1555 | * ClientHello - which we don't want - so we need to take that bit off. | |
1556 | */ | |
1557 | if (s->server) { | |
77815a02 MC |
1558 | PACKET hashprefix, msg; |
1559 | ||
1560 | /* Find how many bytes are left after the first two messages */ | |
1561 | if (!PACKET_buf_init(&hashprefix, hdata, hdatalen) | |
1562 | || !PACKET_forward(&hashprefix, 1) | |
1563 | || !PACKET_get_length_prefixed_3(&hashprefix, &msg) | |
1564 | || !PACKET_forward(&hashprefix, 1) | |
1565 | || !PACKET_get_length_prefixed_3(&hashprefix, &msg)) { | |
c48ffbcc | 1566 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
aff9929b MC |
1567 | goto err; |
1568 | } | |
77815a02 | 1569 | hdatalen -= PACKET_remaining(&hashprefix); |
aff9929b MC |
1570 | } |
1571 | ||
1572 | if (EVP_DigestUpdate(mctx, hdata, hdatalen) <= 0) { | |
c48ffbcc | 1573 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
aff9929b MC |
1574 | goto err; |
1575 | } | |
1576 | } | |
1577 | ||
1578 | if (EVP_DigestUpdate(mctx, msgstart, binderoffset) <= 0 | |
1053a6e2 | 1579 | || EVP_DigestFinal_ex(mctx, hash, NULL) <= 0) { |
c48ffbcc | 1580 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
1053a6e2 MC |
1581 | goto err; |
1582 | } | |
1583 | ||
d8652be0 MC |
1584 | mackey = EVP_PKEY_new_raw_private_key_ex(s->ctx->libctx, "HMAC", |
1585 | s->ctx->propq, finishedkey, | |
1586 | hashsize); | |
1053a6e2 | 1587 | if (mackey == NULL) { |
c48ffbcc | 1588 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
1053a6e2 MC |
1589 | goto err; |
1590 | } | |
1591 | ||
1592 | if (!sign) | |
1593 | binderout = tmpbinder; | |
1594 | ||
1595 | bindersize = hashsize; | |
ed576acd | 1596 | if (EVP_DigestSignInit_ex(mctx, NULL, EVP_MD_get0_name(md), s->ctx->libctx, |
d38b6ae9 | 1597 | s->ctx->propq, mackey, NULL) <= 0 |
1053a6e2 MC |
1598 | || EVP_DigestSignUpdate(mctx, hash, hashsize) <= 0 |
1599 | || EVP_DigestSignFinal(mctx, binderout, &bindersize) <= 0 | |
1600 | || bindersize != hashsize) { | |
c48ffbcc | 1601 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
1053a6e2 MC |
1602 | goto err; |
1603 | } | |
1604 | ||
1605 | if (sign) { | |
1606 | ret = 1; | |
1607 | } else { | |
1608 | /* HMAC keys can't do EVP_DigestVerify* - use CRYPTO_memcmp instead */ | |
1609 | ret = (CRYPTO_memcmp(binderin, binderout, hashsize) == 0); | |
635c8f77 | 1610 | if (!ret) |
c48ffbcc | 1611 | SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_R_BINDER_DOES_NOT_VERIFY); |
1053a6e2 MC |
1612 | } |
1613 | ||
1614 | err: | |
1615 | OPENSSL_cleanse(binderkey, sizeof(binderkey)); | |
1616 | OPENSSL_cleanse(finishedkey, sizeof(finishedkey)); | |
1617 | EVP_PKEY_free(mackey); | |
1618 | EVP_MD_CTX_free(mctx); | |
1619 | ||
1620 | return ret; | |
1621 | } | |
38df5a45 | 1622 | |
f63a17d6 | 1623 | static int final_early_data(SSL *s, unsigned int context, int sent) |
38df5a45 | 1624 | { |
4be3a7c7 MC |
1625 | if (!sent) |
1626 | return 1; | |
1627 | ||
1628 | if (!s->server) { | |
1629 | if (context == SSL_EXT_TLS1_3_ENCRYPTED_EXTENSIONS | |
1630 | && sent | |
1631 | && !s->ext.early_data_ok) { | |
1632 | /* | |
1633 | * If we get here then the server accepted our early_data but we | |
1634 | * later realised that it shouldn't have done (e.g. inconsistent | |
1635 | * ALPN) | |
1636 | */ | |
c48ffbcc | 1637 | SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_R_BAD_EARLY_DATA); |
4be3a7c7 MC |
1638 | return 0; |
1639 | } | |
1640 | ||
38df5a45 | 1641 | return 1; |
4be3a7c7 | 1642 | } |
38df5a45 MC |
1643 | |
1644 | if (s->max_early_data == 0 | |
1645 | || !s->hit | |
38df5a45 MC |
1646 | || s->early_data_state != SSL_EARLY_DATA_ACCEPTING |
1647 | || !s->ext.early_data_ok | |
c9598459 | 1648 | || s->hello_retry_request != SSL_HRR_NONE |
59b2cb26 | 1649 | || (s->allow_early_data_cb != NULL |
1650 | && !s->allow_early_data_cb(s, | |
1651 | s->allow_early_data_cb_data))) { | |
38df5a45 MC |
1652 | s->ext.early_data = SSL_EARLY_DATA_REJECTED; |
1653 | } else { | |
1654 | s->ext.early_data = SSL_EARLY_DATA_ACCEPTED; | |
1655 | ||
1656 | if (!tls13_change_cipher_state(s, | |
1657 | SSL3_CC_EARLY | SSL3_CHANGE_CIPHER_SERVER_READ)) { | |
f63a17d6 | 1658 | /* SSLfatal() already called */ |
38df5a45 MC |
1659 | return 0; |
1660 | } | |
1661 | } | |
1662 | ||
1663 | return 1; | |
1664 | } | |
cf72c757 | 1665 | |
f63a17d6 | 1666 | static int final_maxfragmentlen(SSL *s, unsigned int context, int sent) |
cf72c757 F |
1667 | { |
1668 | /* | |
1669 | * Session resumption on server-side with MFL extension active | |
1670 | * BUT MFL extension packet was not resent (i.e. sent == 0) | |
1671 | */ | |
f63a17d6 | 1672 | if (s->server && s->hit && USE_MAX_FRAGMENT_LENGTH_EXT(s->session) |
cf72c757 | 1673 | && !sent ) { |
c48ffbcc | 1674 | SSLfatal(s, SSL_AD_MISSING_EXTENSION, SSL_R_BAD_EXTENSION); |
cf72c757 F |
1675 | return 0; |
1676 | } | |
1677 | ||
1678 | /* Current SSL buffer is lower than requested MFL */ | |
f63a17d6 MC |
1679 | if (s->session && USE_MAX_FRAGMENT_LENGTH_EXT(s->session) |
1680 | && s->max_send_fragment < GET_MAX_FRAGMENT_LENGTH(s->session)) | |
cf72c757 | 1681 | /* trigger a larger buffer reallocation */ |
f63a17d6 MC |
1682 | if (!ssl3_setup_buffers(s)) { |
1683 | /* SSLfatal() already called */ | |
cf72c757 | 1684 | return 0; |
f63a17d6 | 1685 | } |
cf72c757 F |
1686 | |
1687 | return 1; | |
1688 | } | |
9d75dce3 | 1689 | |
a7e6a3d8 | 1690 | static int init_post_handshake_auth(SSL *s, ossl_unused unsigned int context) |
9d75dce3 TS |
1691 | { |
1692 | s->post_handshake_auth = SSL_PHA_NONE; | |
1693 | ||
1694 | return 1; | |
1695 | } | |
efe0f315 BK |
1696 | |
1697 | /* | |
1698 | * If clients offer "pre_shared_key" without a "psk_key_exchange_modes" | |
1699 | * extension, servers MUST abort the handshake. | |
1700 | */ | |
1701 | static int final_psk(SSL *s, unsigned int context, int sent) | |
1702 | { | |
1703 | if (s->server && sent && s->clienthello != NULL | |
1704 | && !s->clienthello->pre_proc_exts[TLSEXT_IDX_psk_kex_modes].present) { | |
1705 | SSLfatal(s, TLS13_AD_MISSING_EXTENSION, | |
1706 | SSL_R_MISSING_PSK_KEX_MODES_EXTENSION); | |
1707 | return 0; | |
1708 | } | |
1709 | ||
1710 | return 1; | |
1711 | } |