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6b473aca MC |
1 | /* |
2 | * Copyright 2016 The OpenSSL Project Authors. All Rights Reserved. | |
3 | * | |
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 | |
8 | */ | |
9 | ||
f6370040 | 10 | #include <string.h> |
6b473aca MC |
11 | #include "../ssl_locl.h" |
12 | #include "statem_locl.h" | |
13 | ||
1266eefd | 14 | static int final_renegotiate(SSL *s, unsigned int context, int sent, |
805a2e9e | 15 | int *al); |
1266eefd MC |
16 | static int init_server_name(SSL *s, unsigned int context); |
17 | static int final_server_name(SSL *s, unsigned int context, int sent, | |
805a2e9e | 18 | int *al); |
332eb390 | 19 | #ifndef OPENSSL_NO_EC |
1266eefd | 20 | static int final_ec_pt_formats(SSL *s, unsigned int context, int sent, |
332eb390 MC |
21 | int *al); |
22 | #endif | |
1266eefd | 23 | static int init_session_ticket(SSL *s, unsigned int context); |
8f8c11d8 | 24 | #ifndef OPENSSL_NO_OCSP |
1266eefd | 25 | static int init_status_request(SSL *s, unsigned int context); |
8f8c11d8 | 26 | #endif |
805a2e9e | 27 | #ifndef OPENSSL_NO_NEXTPROTONEG |
1266eefd | 28 | static int init_npn(SSL *s, unsigned int context); |
805a2e9e | 29 | #endif |
1266eefd MC |
30 | static int init_alpn(SSL *s, unsigned int context); |
31 | static int final_alpn(SSL *s, unsigned int context, int sent, int *al); | |
32 | static int init_sig_algs(SSL *s, unsigned int context); | |
45615c5f DSH |
33 | static int init_certificate_authorities(SSL *s, unsigned int context); |
34 | static int tls_construct_certificate_authorities(SSL *s, WPACKET *pkt, | |
35 | unsigned int context, X509 *x, | |
36 | size_t chainidx, int *al); | |
37 | static int tls_parse_certificate_authorities(SSL *s, PACKET *pkt, | |
38 | unsigned int context, X509 *x, | |
39 | size_t chainidx, int *al); | |
805a2e9e | 40 | #ifndef OPENSSL_NO_SRP |
1266eefd | 41 | static int init_srp(SSL *s, unsigned int context); |
805a2e9e | 42 | #endif |
1266eefd MC |
43 | static int init_etm(SSL *s, unsigned int context); |
44 | static int init_ems(SSL *s, unsigned int context); | |
45 | static int final_ems(SSL *s, unsigned int context, int sent, int *al); | |
b2f7e8c0 | 46 | static int init_psk_kex_modes(SSL *s, unsigned int context); |
deb2d5e7 | 47 | #ifndef OPENSSL_NO_EC |
f4bbb37c | 48 | static int final_key_share(SSL *s, unsigned int context, int sent, int *al); |
deb2d5e7 | 49 | #endif |
805a2e9e | 50 | #ifndef OPENSSL_NO_SRTP |
1266eefd | 51 | static int init_srtp(SSL *s, unsigned int context); |
805a2e9e | 52 | #endif |
04904312 | 53 | static int final_sig_algs(SSL *s, unsigned int context, int sent, int *al); |
38df5a45 | 54 | static int final_early_data(SSL *s, unsigned int context, int sent, int *al); |
805a2e9e | 55 | |
70af3d8e | 56 | /* Structure to define a built-in extension */ |
1266eefd MC |
57 | typedef struct extensions_definition_st { |
58 | /* The defined type for the extension */ | |
6b473aca | 59 | unsigned int type; |
1266eefd MC |
60 | /* |
61 | * The context that this extension applies to, e.g. what messages and | |
62 | * protocol versions | |
63 | */ | |
64 | unsigned int context; | |
68db4dda | 65 | /* |
805a2e9e MC |
66 | * Initialise extension before parsing. Always called for relevant contexts |
67 | * even if extension not present | |
68db4dda | 68 | */ |
1266eefd MC |
69 | int (*init)(SSL *s, unsigned int context); |
70 | /* Parse extension sent from client to server */ | |
61138358 MC |
71 | int (*parse_ctos)(SSL *s, PACKET *pkt, unsigned int context, X509 *x, |
72 | size_t chainidx, int *al); | |
1266eefd | 73 | /* Parse extension send from server to client */ |
61138358 MC |
74 | int (*parse_stoc)(SSL *s, PACKET *pkt, unsigned int context, X509 *x, |
75 | size_t chainidx, int *al); | |
1266eefd | 76 | /* Construct extension sent from server to client */ |
61138358 MC |
77 | int (*construct_stoc)(SSL *s, WPACKET *pkt, unsigned int context, X509 *x, |
78 | size_t chainidx, int *al); | |
1266eefd | 79 | /* Construct extension sent from client to server */ |
61138358 MC |
80 | int (*construct_ctos)(SSL *s, WPACKET *pkt, unsigned int context, X509 *x, |
81 | size_t chainidx, int *al); | |
68db4dda | 82 | /* |
805a2e9e MC |
83 | * Finalise extension after parsing. Always called where an extensions was |
84 | * initialised even if the extension was not present. |sent| is set to 1 if | |
85 | * the extension was seen, or 0 otherwise. | |
68db4dda | 86 | */ |
1266eefd | 87 | int (*final)(SSL *s, unsigned int context, int sent, int *al); |
6b473aca MC |
88 | } EXTENSION_DEFINITION; |
89 | ||
4b299b8e | 90 | /* |
70af3d8e | 91 | * Definitions of all built-in extensions. NOTE: Changes in the number or order |
3e6c1da8 F |
92 | * of these extensions should be mirrored with equivalent changes to the |
93 | * indexes ( TLSEXT_IDX_* ) defined in ssl_locl.h. | |
70af3d8e MC |
94 | * Each extension has an initialiser, a client and |
95 | * server side parser and a finaliser. The initialiser is called (if the | |
96 | * extension is relevant to the given context) even if we did not see the | |
97 | * extension in the message that we received. The parser functions are only | |
98 | * called if we see the extension in the message. The finalisers are always | |
99 | * called if the initialiser was called. | |
100 | * There are also server and client side constructor functions which are always | |
101 | * called during message construction if the extension is relevant for the | |
102 | * given context. | |
103 | * The initialisation, parsing, finalisation and construction functions are | |
104 | * always called in the order defined in this list. Some extensions may depend | |
105 | * on others having been processed first, so the order of this list is | |
106 | * significant. | |
107 | * The extension context is defined by a series of flags which specify which | |
108 | * messages the extension is relevant to. These flags also specify whether the | |
3e6c1da8 | 109 | * extension is relevant to a particular protocol or protocol version. |
a1448c26 | 110 | * |
70af3d8e | 111 | * TODO(TLS1.3): Make sure we have a test to check the consistency of these |
4b299b8e | 112 | */ |
0785274c | 113 | #define INVALID_EXTENSION { 0x10000, 0, NULL, NULL, NULL, NULL, NULL, NULL } |
6b473aca MC |
114 | static const EXTENSION_DEFINITION ext_defs[] = { |
115 | { | |
116 | TLSEXT_TYPE_renegotiate, | |
fe874d27 MC |
117 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO |
118 | | SSL_EXT_SSL3_ALLOWED | SSL_EXT_TLS1_2_AND_BELOW_ONLY, | |
1266eefd MC |
119 | NULL, tls_parse_ctos_renegotiate, tls_parse_stoc_renegotiate, |
120 | tls_construct_stoc_renegotiate, tls_construct_ctos_renegotiate, | |
121 | final_renegotiate | |
6b473aca MC |
122 | }, |
123 | { | |
124 | TLSEXT_TYPE_server_name, | |
fe874d27 MC |
125 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO |
126 | | SSL_EXT_TLS1_3_ENCRYPTED_EXTENSIONS, | |
1266eefd MC |
127 | init_server_name, |
128 | tls_parse_ctos_server_name, tls_parse_stoc_server_name, | |
129 | tls_construct_stoc_server_name, tls_construct_ctos_server_name, | |
130 | final_server_name | |
6b473aca MC |
131 | }, |
132 | #ifndef OPENSSL_NO_SRP | |
133 | { | |
134 | TLSEXT_TYPE_srp, | |
fe874d27 | 135 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_AND_BELOW_ONLY, |
1266eefd | 136 | init_srp, tls_parse_ctos_srp, NULL, NULL, tls_construct_ctos_srp, NULL |
6b473aca | 137 | }, |
0785274c MC |
138 | #else |
139 | INVALID_EXTENSION, | |
6b473aca MC |
140 | #endif |
141 | #ifndef OPENSSL_NO_EC | |
142 | { | |
143 | TLSEXT_TYPE_ec_point_formats, | |
fe874d27 MC |
144 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO |
145 | | SSL_EXT_TLS1_2_AND_BELOW_ONLY, | |
1266eefd MC |
146 | NULL, tls_parse_ctos_ec_pt_formats, tls_parse_stoc_ec_pt_formats, |
147 | tls_construct_stoc_ec_pt_formats, tls_construct_ctos_ec_pt_formats, | |
148 | final_ec_pt_formats | |
6b473aca MC |
149 | }, |
150 | { | |
151 | TLSEXT_TYPE_supported_groups, | |
fe874d27 | 152 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_3_ENCRYPTED_EXTENSIONS, |
1266eefd | 153 | NULL, tls_parse_ctos_supported_groups, NULL, |
7da160b0 | 154 | NULL /* TODO(TLS1.3): Need to add this */, |
1266eefd | 155 | tls_construct_ctos_supported_groups, NULL |
6b473aca | 156 | }, |
0785274c MC |
157 | #else |
158 | INVALID_EXTENSION, | |
159 | INVALID_EXTENSION, | |
6b473aca MC |
160 | #endif |
161 | { | |
162 | TLSEXT_TYPE_session_ticket, | |
fe874d27 MC |
163 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO |
164 | | SSL_EXT_TLS1_2_AND_BELOW_ONLY, | |
1266eefd MC |
165 | init_session_ticket, tls_parse_ctos_session_ticket, |
166 | tls_parse_stoc_session_ticket, tls_construct_stoc_session_ticket, | |
167 | tls_construct_ctos_session_ticket, NULL | |
6b473aca MC |
168 | }, |
169 | { | |
170 | TLSEXT_TYPE_signature_algorithms, | |
fe874d27 | 171 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_3_CERTIFICATE_REQUEST, |
51c7d3e8 DSH |
172 | init_sig_algs, tls_parse_ctos_sig_algs, |
173 | tls_parse_ctos_sig_algs, tls_construct_ctos_sig_algs, | |
04904312 | 174 | tls_construct_ctos_sig_algs, final_sig_algs |
6b473aca | 175 | }, |
ab83e314 | 176 | #ifndef OPENSSL_NO_OCSP |
6b473aca MC |
177 | { |
178 | TLSEXT_TYPE_status_request, | |
fe874d27 MC |
179 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO |
180 | | SSL_EXT_TLS1_3_CERTIFICATE, | |
1266eefd MC |
181 | init_status_request, tls_parse_ctos_status_request, |
182 | tls_parse_stoc_status_request, tls_construct_stoc_status_request, | |
f63e4288 | 183 | tls_construct_ctos_status_request, NULL |
6b473aca | 184 | }, |
0785274c MC |
185 | #else |
186 | INVALID_EXTENSION, | |
ab83e314 | 187 | #endif |
6b473aca MC |
188 | #ifndef OPENSSL_NO_NEXTPROTONEG |
189 | { | |
190 | TLSEXT_TYPE_next_proto_neg, | |
fe874d27 MC |
191 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO |
192 | | SSL_EXT_TLS1_2_AND_BELOW_ONLY, | |
1266eefd MC |
193 | init_npn, tls_parse_ctos_npn, tls_parse_stoc_npn, |
194 | tls_construct_stoc_next_proto_neg, tls_construct_ctos_npn, NULL | |
6b473aca | 195 | }, |
0785274c MC |
196 | #else |
197 | INVALID_EXTENSION, | |
6b473aca MC |
198 | #endif |
199 | { | |
02f0274e MC |
200 | /* |
201 | * Must appear in this list after server_name so that finalisation | |
202 | * happens after server_name callbacks | |
203 | */ | |
6b473aca | 204 | TLSEXT_TYPE_application_layer_protocol_negotiation, |
fe874d27 MC |
205 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO |
206 | | SSL_EXT_TLS1_3_ENCRYPTED_EXTENSIONS, | |
1266eefd MC |
207 | init_alpn, tls_parse_ctos_alpn, tls_parse_stoc_alpn, |
208 | tls_construct_stoc_alpn, tls_construct_ctos_alpn, final_alpn | |
6b473aca | 209 | }, |
7da160b0 | 210 | #ifndef OPENSSL_NO_SRTP |
6b473aca MC |
211 | { |
212 | TLSEXT_TYPE_use_srtp, | |
fe874d27 MC |
213 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO |
214 | | SSL_EXT_TLS1_3_ENCRYPTED_EXTENSIONS | SSL_EXT_DTLS_ONLY, | |
1266eefd MC |
215 | init_srtp, tls_parse_ctos_use_srtp, tls_parse_stoc_use_srtp, |
216 | tls_construct_stoc_use_srtp, tls_construct_ctos_use_srtp, NULL | |
6b473aca | 217 | }, |
0785274c MC |
218 | #else |
219 | INVALID_EXTENSION, | |
7da160b0 | 220 | #endif |
6b473aca MC |
221 | { |
222 | TLSEXT_TYPE_encrypt_then_mac, | |
fe874d27 MC |
223 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO |
224 | | SSL_EXT_TLS1_2_AND_BELOW_ONLY, | |
1266eefd MC |
225 | init_etm, tls_parse_ctos_etm, tls_parse_stoc_etm, |
226 | tls_construct_stoc_etm, tls_construct_ctos_etm, NULL | |
6b473aca | 227 | }, |
6dd083fd | 228 | #ifndef OPENSSL_NO_CT |
6b473aca MC |
229 | { |
230 | TLSEXT_TYPE_signed_certificate_timestamp, | |
fe874d27 MC |
231 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO |
232 | | SSL_EXT_TLS1_3_CERTIFICATE, | |
68db4dda | 233 | NULL, |
6b473aca MC |
234 | /* |
235 | * No server side support for this, but can be provided by a custom | |
236 | * extension. This is an exception to the rule that custom extensions | |
237 | * cannot override built in ones. | |
238 | */ | |
1266eefd | 239 | NULL, tls_parse_stoc_sct, NULL, tls_construct_ctos_sct, NULL |
6b473aca | 240 | }, |
0785274c MC |
241 | #else |
242 | INVALID_EXTENSION, | |
6dd083fd | 243 | #endif |
6b473aca MC |
244 | { |
245 | TLSEXT_TYPE_extended_master_secret, | |
fe874d27 MC |
246 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO |
247 | | SSL_EXT_TLS1_2_AND_BELOW_ONLY, | |
1266eefd MC |
248 | init_ems, tls_parse_ctos_ems, tls_parse_stoc_ems, |
249 | tls_construct_stoc_ems, tls_construct_ctos_ems, final_ems | |
6b473aca MC |
250 | }, |
251 | { | |
252 | TLSEXT_TYPE_supported_versions, | |
fe874d27 MC |
253 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS_IMPLEMENTATION_ONLY |
254 | | SSL_EXT_TLS1_3_ONLY, | |
68db4dda | 255 | NULL, |
6b473aca | 256 | /* Processed inline as part of version selection */ |
1266eefd | 257 | NULL, NULL, NULL, tls_construct_ctos_supported_versions, NULL |
6b473aca | 258 | }, |
b2f7e8c0 | 259 | { |
b2f7e8c0 | 260 | TLSEXT_TYPE_psk_kex_modes, |
fe874d27 MC |
261 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS_IMPLEMENTATION_ONLY |
262 | | SSL_EXT_TLS1_3_ONLY, | |
b2f7e8c0 MC |
263 | init_psk_kex_modes, tls_parse_ctos_psk_kex_modes, NULL, NULL, |
264 | tls_construct_ctos_psk_kex_modes, NULL | |
265 | }, | |
deb2d5e7 | 266 | #ifndef OPENSSL_NO_EC |
6b473aca | 267 | { |
70af3d8e MC |
268 | /* |
269 | * Must be in this list after supported_groups. We need that to have | |
270 | * been parsed before we do this one. | |
271 | */ | |
6b473aca | 272 | TLSEXT_TYPE_key_share, |
fe874d27 MC |
273 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_3_SERVER_HELLO |
274 | | SSL_EXT_TLS1_3_HELLO_RETRY_REQUEST | SSL_EXT_TLS_IMPLEMENTATION_ONLY | |
275 | | SSL_EXT_TLS1_3_ONLY, | |
1266eefd | 276 | NULL, tls_parse_ctos_key_share, tls_parse_stoc_key_share, |
f4bbb37c MC |
277 | tls_construct_stoc_key_share, tls_construct_ctos_key_share, |
278 | final_key_share | |
7da160b0 | 279 | }, |
deb2d5e7 | 280 | #endif |
cfef5027 MC |
281 | { |
282 | TLSEXT_TYPE_cookie, | |
fe874d27 MC |
283 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_3_HELLO_RETRY_REQUEST |
284 | | SSL_EXT_TLS_IMPLEMENTATION_ONLY | SSL_EXT_TLS1_3_ONLY, | |
cfef5027 MC |
285 | NULL, NULL, tls_parse_stoc_cookie, NULL, tls_construct_ctos_cookie, |
286 | NULL | |
287 | }, | |
7da160b0 MC |
288 | { |
289 | /* | |
290 | * Special unsolicited ServerHello extension only used when | |
291 | * SSL_OP_CRYPTOPRO_TLSEXT_BUG is set | |
292 | */ | |
293 | TLSEXT_TYPE_cryptopro_bug, | |
fe874d27 | 294 | SSL_EXT_TLS1_2_SERVER_HELLO | SSL_EXT_TLS1_2_AND_BELOW_ONLY, |
1266eefd | 295 | NULL, NULL, NULL, tls_construct_stoc_cryptopro_bug, NULL, NULL |
ab83e314 | 296 | }, |
38df5a45 MC |
297 | { |
298 | TLSEXT_TYPE_early_data, | |
fe874d27 MC |
299 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_3_ENCRYPTED_EXTENSIONS |
300 | | SSL_EXT_TLS1_3_NEW_SESSION_TICKET, | |
38df5a45 MC |
301 | NULL, tls_parse_ctos_early_data, tls_parse_stoc_early_data, |
302 | tls_construct_stoc_early_data, tls_construct_ctos_early_data, | |
303 | final_early_data | |
304 | }, | |
45615c5f DSH |
305 | { |
306 | TLSEXT_TYPE_certificate_authorities, | |
fe874d27 MC |
307 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_3_CERTIFICATE_REQUEST |
308 | | SSL_EXT_TLS1_3_ONLY, | |
45615c5f DSH |
309 | init_certificate_authorities, |
310 | tls_parse_certificate_authorities, tls_parse_certificate_authorities, | |
311 | tls_construct_certificate_authorities, | |
312 | tls_construct_certificate_authorities, NULL, | |
313 | }, | |
ab83e314 | 314 | { |
ec15acb6 | 315 | /* Must be immediately before pre_shared_key */ |
ab83e314 | 316 | TLSEXT_TYPE_padding, |
fe874d27 | 317 | SSL_EXT_CLIENT_HELLO, |
68db4dda | 318 | NULL, |
ab83e314 | 319 | /* We send this, but don't read it */ |
1266eefd | 320 | NULL, NULL, NULL, tls_construct_ctos_padding, NULL |
ec15acb6 MC |
321 | }, |
322 | { | |
323 | /* Required by the TLSv1.3 spec to always be the last extension */ | |
324 | TLSEXT_TYPE_psk, | |
fe874d27 MC |
325 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_3_SERVER_HELLO |
326 | | SSL_EXT_TLS_IMPLEMENTATION_ONLY | SSL_EXT_TLS1_3_ONLY, | |
0247086d | 327 | NULL, tls_parse_ctos_psk, tls_parse_stoc_psk, tls_construct_stoc_psk, |
1053a6e2 | 328 | tls_construct_ctos_psk, NULL |
6b473aca MC |
329 | } |
330 | }; | |
331 | ||
43ae5eed MC |
332 | /* Check whether an extension's context matches the current context */ |
333 | static int validate_context(SSL *s, unsigned int extctx, unsigned int thisctx) | |
334 | { | |
335 | /* Check we're allowed to use this extension in this context */ | |
336 | if ((thisctx & extctx) == 0) | |
337 | return 0; | |
338 | ||
339 | if (SSL_IS_DTLS(s)) { | |
340 | if ((extctx & SSL_EXT_TLS_ONLY) != 0) | |
341 | return 0; | |
342 | } else if ((extctx & SSL_EXT_DTLS_ONLY) != 0) { | |
343 | return 0; | |
344 | } | |
345 | ||
346 | return 1; | |
347 | } | |
348 | ||
6b473aca MC |
349 | /* |
350 | * Verify whether we are allowed to use the extension |type| in the current | |
351 | * |context|. Returns 1 to indicate the extension is allowed or unknown or 0 to | |
70af3d8e | 352 | * indicate the extension is not allowed. If returning 1 then |*found| is set to |
69687aa8 | 353 | * the definition for the extension we found. |
6b473aca | 354 | */ |
70af3d8e | 355 | static int verify_extension(SSL *s, unsigned int context, unsigned int type, |
1266eefd MC |
356 | custom_ext_methods *meths, RAW_EXTENSION *rawexlist, |
357 | RAW_EXTENSION **found) | |
6b473aca MC |
358 | { |
359 | size_t i; | |
70af3d8e | 360 | size_t builtin_num = OSSL_NELEM(ext_defs); |
d270de32 | 361 | const EXTENSION_DEFINITION *thisext; |
6b473aca | 362 | |
1266eefd MC |
363 | for (i = 0, thisext = ext_defs; i < builtin_num; i++, thisext++) { |
364 | if (type == thisext->type) { | |
43ae5eed | 365 | if (!validate_context(s, thisext->context, context)) |
6b473aca MC |
366 | return 0; |
367 | ||
1266eefd | 368 | *found = &rawexlist[i]; |
6b473aca MC |
369 | return 1; |
370 | } | |
371 | } | |
372 | ||
70af3d8e MC |
373 | /* Check the custom extensions */ |
374 | if (meths != NULL) { | |
43ae5eed MC |
375 | size_t offset = 0; |
376 | int server = -1; | |
377 | custom_ext_method *meth = NULL; | |
378 | ||
379 | if ((context & SSL_EXT_CLIENT_HELLO) != 0) | |
380 | server = 1; | |
381 | else if ((context & SSL_EXT_TLS1_2_SERVER_HELLO) != 0) | |
382 | server = 0; | |
383 | ||
384 | meth = custom_ext_find(meths, server, type, &offset); | |
385 | if (meth != NULL) { | |
386 | if (!validate_context(s, meth->context, context)) | |
387 | return 0; | |
388 | *found = &rawexlist[offset + builtin_num]; | |
389 | return 1; | |
6b473aca MC |
390 | } |
391 | } | |
392 | ||
70af3d8e | 393 | /* Unknown extension. We allow it */ |
1266eefd | 394 | *found = NULL; |
70af3d8e | 395 | return 1; |
6b473aca MC |
396 | } |
397 | ||
70af3d8e MC |
398 | /* |
399 | * Check whether the context defined for an extension |extctx| means whether | |
400 | * the extension is relevant for the current context |thisctx| or not. Returns | |
401 | * 1 if the extension is relevant for this context, and 0 otherwise | |
402 | */ | |
43ae5eed | 403 | int extension_is_relevant(SSL *s, unsigned int extctx, unsigned int thisctx) |
805a2e9e MC |
404 | { |
405 | if ((SSL_IS_DTLS(s) | |
fe874d27 | 406 | && (extctx & SSL_EXT_TLS_IMPLEMENTATION_ONLY) != 0) |
805a2e9e | 407 | || (s->version == SSL3_VERSION |
fe874d27 | 408 | && (extctx & SSL_EXT_SSL3_ALLOWED) == 0) |
805a2e9e | 409 | || (SSL_IS_TLS13(s) |
fe874d27 | 410 | && (extctx & SSL_EXT_TLS1_2_AND_BELOW_ONLY) != 0) |
43ae5eed MC |
411 | || (!SSL_IS_TLS13(s) && (extctx & SSL_EXT_TLS1_3_ONLY) != 0) |
412 | || (s->hit && (extctx & SSL_EXT_IGNORE_ON_RESUMPTION) != 0)) | |
805a2e9e MC |
413 | return 0; |
414 | ||
415 | return 1; | |
416 | } | |
417 | ||
6b473aca MC |
418 | /* |
419 | * Gather a list of all the extensions from the data in |packet]. |context| | |
70af3d8e | 420 | * tells us which message this extension is for. The raw extension data is |
1266eefd MC |
421 | * stored in |*res| on success. In the event of an error the alert type to use |
422 | * is stored in |*al|. We don't actually process the content of the extensions | |
423 | * yet, except to check their types. This function also runs the initialiser | |
424 | * functions for all known extensions (whether we have collected them or not). | |
425 | * If successful the caller is responsible for freeing the contents of |*res|. | |
6b473aca MC |
426 | * |
427 | * Per http://tools.ietf.org/html/rfc5246#section-7.4.1.4, there may not be | |
428 | * more than one extension of the same type in a ClientHello or ServerHello. | |
429 | * This function returns 1 if all extensions are unique and we have parsed their | |
430 | * types, and 0 if the extensions contain duplicates, could not be successfully | |
1266eefd | 431 | * found, or an internal error occurred. We only check duplicates for |
70af3d8e | 432 | * extensions that we know about. We ignore others. |
6b473aca | 433 | */ |
6b473aca | 434 | int tls_collect_extensions(SSL *s, PACKET *packet, unsigned int context, |
fc5ece2e | 435 | RAW_EXTENSION **res, int *al, size_t *len) |
6b473aca MC |
436 | { |
437 | PACKET extensions = *packet; | |
d270de32 | 438 | size_t i = 0; |
fc5ece2e | 439 | size_t num_exts; |
43ae5eed | 440 | custom_ext_methods *exts = &s->cert->custext; |
6b473aca | 441 | RAW_EXTENSION *raw_extensions = NULL; |
d270de32 | 442 | const EXTENSION_DEFINITION *thisexd; |
6b473aca | 443 | |
ecc2f938 MC |
444 | *res = NULL; |
445 | ||
70af3d8e MC |
446 | /* |
447 | * Initialise server side custom extensions. Client side is done during | |
448 | * construction of extensions for the ClientHello. | |
449 | */ | |
43ae5eed MC |
450 | if ((context & SSL_EXT_CLIENT_HELLO) != 0) |
451 | custom_ext_init(&s->cert->custext); | |
70af3d8e | 452 | |
fc5ece2e BK |
453 | num_exts = OSSL_NELEM(ext_defs) + (exts != NULL ? exts->meths_count : 0); |
454 | raw_extensions = OPENSSL_zalloc(num_exts * sizeof(*raw_extensions)); | |
70af3d8e MC |
455 | if (raw_extensions == NULL) { |
456 | *al = SSL_AD_INTERNAL_ERROR; | |
457 | SSLerr(SSL_F_TLS_COLLECT_EXTENSIONS, ERR_R_MALLOC_FAILURE); | |
458 | return 0; | |
459 | } | |
460 | ||
6b473aca MC |
461 | while (PACKET_remaining(&extensions) > 0) { |
462 | unsigned int type; | |
463 | PACKET extension; | |
1266eefd | 464 | RAW_EXTENSION *thisex; |
6b473aca MC |
465 | |
466 | if (!PACKET_get_net_2(&extensions, &type) || | |
467 | !PACKET_get_length_prefixed_2(&extensions, &extension)) { | |
468 | SSLerr(SSL_F_TLS_COLLECT_EXTENSIONS, SSL_R_BAD_EXTENSION); | |
70af3d8e | 469 | *al = SSL_AD_DECODE_ERROR; |
6b473aca MC |
470 | goto err; |
471 | } | |
70af3d8e MC |
472 | /* |
473 | * Verify this extension is allowed. We only check duplicates for | |
652a6b7e MC |
474 | * extensions that we recognise. We also have a special case for the |
475 | * PSK extension, which must be the last one in the ClientHello. | |
70af3d8e | 476 | */ |
1266eefd | 477 | if (!verify_extension(s, context, type, exts, raw_extensions, &thisex) |
652a6b7e MC |
478 | || (thisex != NULL && thisex->present == 1) |
479 | || (type == TLSEXT_TYPE_psk | |
fe874d27 | 480 | && (context & SSL_EXT_CLIENT_HELLO) != 0 |
652a6b7e | 481 | && PACKET_remaining(&extensions) != 0)) { |
6b473aca | 482 | SSLerr(SSL_F_TLS_COLLECT_EXTENSIONS, SSL_R_BAD_EXTENSION); |
70af3d8e | 483 | *al = SSL_AD_ILLEGAL_PARAMETER; |
6b473aca MC |
484 | goto err; |
485 | } | |
1266eefd MC |
486 | if (thisex != NULL) { |
487 | thisex->data = extension; | |
488 | thisex->present = 1; | |
489 | thisex->type = type; | |
6b473aca MC |
490 | } |
491 | } | |
492 | ||
68db4dda MC |
493 | /* |
494 | * Initialise all known extensions relevant to this context, whether we have | |
495 | * found them or not | |
496 | */ | |
1266eefd MC |
497 | for (thisexd = ext_defs, i = 0; i < OSSL_NELEM(ext_defs); i++, thisexd++) { |
498 | if(thisexd->init != NULL && (thisexd->context & context) != 0 | |
499 | && extension_is_relevant(s, thisexd->context, context) | |
500 | && !thisexd->init(s, context)) { | |
70af3d8e | 501 | *al = SSL_AD_INTERNAL_ERROR; |
68db4dda MC |
502 | goto err; |
503 | } | |
504 | } | |
505 | ||
6b473aca | 506 | *res = raw_extensions; |
fc5ece2e BK |
507 | if (len != NULL) |
508 | *len = num_exts; | |
6b473aca MC |
509 | return 1; |
510 | ||
511 | err: | |
512 | OPENSSL_free(raw_extensions); | |
513 | return 0; | |
514 | } | |
515 | ||
68db4dda | 516 | /* |
70af3d8e MC |
517 | * Runs the parser for a given extension with index |idx|. |exts| contains the |
518 | * list of all parsed extensions previously collected by | |
519 | * tls_collect_extensions(). The parser is only run if it is applicable for the | |
f97d4c37 MC |
520 | * given |context| and the parser has not already been run. If this is for a |
521 | * Certificate message, then we also provide the parser with the relevant | |
8521ced6 | 522 | * Certificate |x| and its position in the |chainidx| with 0 being the first |
f97d4c37 MC |
523 | * Certificate. Returns 1 on success or 0 on failure. In the event of a failure |
524 | * |*al| is populated with a suitable alert code. If an extension is not present | |
525 | * this counted as success. | |
68db4dda | 526 | */ |
d270de32 | 527 | int tls_parse_extension(SSL *s, TLSEXT_INDEX idx, int context, |
8521ced6 | 528 | RAW_EXTENSION *exts, X509 *x, size_t chainidx, int *al) |
6b473aca | 529 | { |
70af3d8e | 530 | RAW_EXTENSION *currext = &exts[idx]; |
61138358 MC |
531 | int (*parser)(SSL *s, PACKET *pkt, unsigned int context, X509 *x, |
532 | size_t chainidx, int *al) = NULL; | |
6b473aca | 533 | |
70af3d8e MC |
534 | /* Skip if the extension is not present */ |
535 | if (!currext->present) | |
536 | return 1; | |
6b473aca | 537 | |
aff8c126 RS |
538 | if (s->ext.debug_cb) |
539 | s->ext.debug_cb(s, !s->server, currext->type, | |
540 | PACKET_data(&currext->data), | |
541 | PACKET_remaining(&currext->data), | |
542 | s->ext.debug_arg); | |
6b473aca | 543 | |
70af3d8e MC |
544 | /* Skip if we've already parsed this extension */ |
545 | if (currext->parsed) | |
546 | return 1; | |
6b473aca | 547 | |
70af3d8e MC |
548 | currext->parsed = 1; |
549 | ||
550 | if (idx < OSSL_NELEM(ext_defs)) { | |
551 | /* We are handling a built-in extension */ | |
552 | const EXTENSION_DEFINITION *extdef = &ext_defs[idx]; | |
553 | ||
554 | /* Check if extension is defined for our protocol. If not, skip */ | |
555 | if (!extension_is_relevant(s, extdef->context, context)) | |
556 | return 1; | |
557 | ||
1266eefd | 558 | parser = s->server ? extdef->parse_ctos : extdef->parse_stoc; |
224135e9 | 559 | |
1266eefd | 560 | if (parser != NULL) |
61138358 | 561 | return parser(s, &currext->data, context, x, chainidx, al); |
6b473aca | 562 | |
70af3d8e MC |
563 | /* |
564 | * If the parser is NULL we fall through to the custom extension | |
565 | * processing | |
566 | */ | |
6b473aca MC |
567 | } |
568 | ||
43ae5eed MC |
569 | /* Parse custom extensions */ |
570 | if (custom_ext_parse(s, context, currext->type, | |
571 | PACKET_data(&currext->data), | |
572 | PACKET_remaining(&currext->data), | |
573 | x, chainidx, al) <= 0) | |
70af3d8e MC |
574 | return 0; |
575 | ||
805a2e9e MC |
576 | return 1; |
577 | } | |
578 | ||
579 | /* | |
580 | * Parse all remaining extensions that have not yet been parsed. Also calls the | |
70af3d8e | 581 | * finalisation for all extensions at the end, whether we collected them or not. |
f97d4c37 MC |
582 | * Returns 1 for success or 0 for failure. If we are working on a Certificate |
583 | * message then we also pass the Certificate |x| and its position in the | |
8521ced6 MC |
584 | * |chainidx|, with 0 being the first certificate. On failure, |*al| is |
585 | * populated with a suitable alert code. | |
805a2e9e | 586 | */ |
f97d4c37 | 587 | int tls_parse_all_extensions(SSL *s, int context, RAW_EXTENSION *exts, X509 *x, |
8521ced6 | 588 | size_t chainidx, int *al) |
805a2e9e | 589 | { |
1266eefd | 590 | size_t i, numexts = OSSL_NELEM(ext_defs); |
d270de32 | 591 | const EXTENSION_DEFINITION *thisexd; |
805a2e9e | 592 | |
70af3d8e | 593 | /* Calculate the number of extensions in the extensions list */ |
43ae5eed | 594 | numexts += s->cert->custext.meths_count; |
70af3d8e MC |
595 | |
596 | /* Parse each extension in turn */ | |
1266eefd | 597 | for (i = 0; i < numexts; i++) { |
8521ced6 | 598 | if (!tls_parse_extension(s, i, context, exts, x, chainidx, al)) |
70af3d8e MC |
599 | return 0; |
600 | } | |
805a2e9e | 601 | |
68db4dda MC |
602 | /* |
603 | * Finalise all known extensions relevant to this context, whether we have | |
604 | * found them or not | |
605 | */ | |
1266eefd MC |
606 | for (i = 0, thisexd = ext_defs; i < OSSL_NELEM(ext_defs); i++, thisexd++) { |
607 | if(thisexd->final != NULL | |
608 | && (thisexd->context & context) != 0 | |
609 | && !thisexd->final(s, context, exts[i].present, al)) | |
68db4dda | 610 | return 0; |
68db4dda MC |
611 | } |
612 | ||
6b473aca MC |
613 | return 1; |
614 | } | |
615 | ||
43ae5eed MC |
616 | int should_add_extension(SSL *s, unsigned int extctx, unsigned int thisctx, |
617 | int max_version) | |
618 | { | |
619 | /* Skip if not relevant for our context */ | |
620 | if ((extctx & thisctx) == 0) | |
621 | return 0; | |
622 | ||
623 | /* Check if this extension is defined for our protocol. If not, skip */ | |
624 | if ((SSL_IS_DTLS(s) && (extctx & SSL_EXT_TLS_IMPLEMENTATION_ONLY) != 0) | |
625 | || (s->version == SSL3_VERSION | |
626 | && (extctx & SSL_EXT_SSL3_ALLOWED) == 0) | |
627 | || (SSL_IS_TLS13(s) | |
628 | && (extctx & SSL_EXT_TLS1_2_AND_BELOW_ONLY) != 0) | |
629 | || (!SSL_IS_TLS13(s) | |
630 | && (extctx & SSL_EXT_TLS1_3_ONLY) != 0 | |
631 | && (thisctx & SSL_EXT_CLIENT_HELLO) == 0) | |
632 | || ((extctx & SSL_EXT_TLS1_3_ONLY) != 0 | |
633 | && (thisctx & SSL_EXT_CLIENT_HELLO) != 0 | |
634 | && (SSL_IS_DTLS(s) || max_version < TLS1_3_VERSION))) | |
635 | return 0; | |
636 | ||
637 | return 1; | |
638 | } | |
639 | ||
6b473aca | 640 | /* |
70af3d8e | 641 | * Construct all the extensions relevant to the current |context| and write |
30aeba43 | 642 | * them to |pkt|. If this is an extension for a Certificate in a Certificate |
8521ced6 MC |
643 | * message, then |x| will be set to the Certificate we are handling, and |
644 | * |chainidx| will indicate the position in the chainidx we are processing (with | |
645 | * 0 being the first in the chain). Returns 1 on success or 0 on failure. If a | |
646 | * failure occurs then |al| is populated with a suitable alert code. On a | |
647 | * failure construction stops at the first extension to fail to construct. | |
6b473aca | 648 | */ |
224135e9 | 649 | int tls_construct_extensions(SSL *s, WPACKET *pkt, unsigned int context, |
8521ced6 | 650 | X509 *x, size_t chainidx, int *al) |
224135e9 | 651 | { |
1266eefd | 652 | size_t i; |
43ae5eed | 653 | int min_version, max_version = 0, reason, tmpal; |
d270de32 | 654 | const EXTENSION_DEFINITION *thisexd; |
224135e9 | 655 | |
7da160b0 | 656 | /* |
70af3d8e | 657 | * Normally if something goes wrong during construction it's an internal |
7da160b0 MC |
658 | * error. We can always override this later. |
659 | */ | |
70af3d8e | 660 | tmpal = SSL_AD_INTERNAL_ERROR; |
7da160b0 | 661 | |
224135e9 MC |
662 | if (!WPACKET_start_sub_packet_u16(pkt) |
663 | /* | |
664 | * If extensions are of zero length then we don't even add the | |
7da160b0 | 665 | * extensions length bytes to a ClientHello/ServerHello in SSLv3 |
224135e9 | 666 | */ |
fe874d27 MC |
667 | || ((context & |
668 | (SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO)) != 0 | |
669 | && s->version == SSL3_VERSION | |
670 | && !WPACKET_set_flags(pkt, | |
224135e9 | 671 | WPACKET_FLAGS_ABANDON_ON_ZERO_LENGTH))) { |
224135e9 | 672 | SSLerr(SSL_F_TLS_CONSTRUCT_EXTENSIONS, ERR_R_INTERNAL_ERROR); |
70af3d8e | 673 | goto err; |
224135e9 MC |
674 | } |
675 | ||
fe874d27 | 676 | if ((context & SSL_EXT_CLIENT_HELLO) != 0) { |
ab83e314 MC |
677 | reason = ssl_get_client_min_max_version(s, &min_version, &max_version); |
678 | if (reason != 0) { | |
679 | SSLerr(SSL_F_TLS_CONSTRUCT_EXTENSIONS, reason); | |
70af3d8e | 680 | goto err; |
ab83e314 MC |
681 | } |
682 | } | |
683 | ||
684 | /* Add custom extensions first */ | |
fe874d27 | 685 | if ((context & SSL_EXT_CLIENT_HELLO) != 0) { |
43ae5eed MC |
686 | /* On the server side with initiase during ClientHello parsing */ |
687 | custom_ext_init(&s->cert->custext); | |
ab83e314 | 688 | } |
43ae5eed | 689 | if (!custom_ext_add(s, context, pkt, x, chainidx, max_version, &tmpal)) { |
ab83e314 | 690 | SSLerr(SSL_F_TLS_CONSTRUCT_EXTENSIONS, ERR_R_INTERNAL_ERROR); |
70af3d8e | 691 | goto err; |
ab83e314 MC |
692 | } |
693 | ||
1266eefd | 694 | for (i = 0, thisexd = ext_defs; i < OSSL_NELEM(ext_defs); i++, thisexd++) { |
61138358 MC |
695 | int (*construct)(SSL *s, WPACKET *pkt, unsigned int context, X509 *x, |
696 | size_t chainidx, int *al); | |
4b299b8e | 697 | |
224135e9 | 698 | /* Skip if not relevant for our context */ |
43ae5eed | 699 | if (!should_add_extension(s, thisexd->context, context, max_version)) |
224135e9 MC |
700 | continue; |
701 | ||
1266eefd MC |
702 | construct = s->server ? thisexd->construct_stoc |
703 | : thisexd->construct_ctos; | |
224135e9 | 704 | |
43ae5eed | 705 | if (construct == NULL) |
224135e9 MC |
706 | continue; |
707 | ||
61138358 | 708 | if (!construct(s, pkt, context, x, chainidx, &tmpal)) |
70af3d8e | 709 | goto err; |
224135e9 MC |
710 | } |
711 | ||
224135e9 | 712 | if (!WPACKET_close(pkt)) { |
224135e9 | 713 | SSLerr(SSL_F_TLS_CONSTRUCT_EXTENSIONS, ERR_R_INTERNAL_ERROR); |
70af3d8e | 714 | goto err; |
224135e9 MC |
715 | } |
716 | ||
717 | return 1; | |
70af3d8e MC |
718 | |
719 | err: | |
720 | *al = tmpal; | |
721 | return 0; | |
224135e9 | 722 | } |
805a2e9e | 723 | |
70af3d8e MC |
724 | /* |
725 | * Built in extension finalisation and initialisation functions. All initialise | |
726 | * or finalise the associated extension type for the given |context|. For | |
727 | * finalisers |sent| is set to 1 if we saw the extension during parsing, and 0 | |
728 | * otherwise. These functions return 1 on success or 0 on failure. In the event | |
729 | * of a failure then |*al| is populated with a suitable error code. | |
730 | */ | |
731 | ||
1266eefd | 732 | static int final_renegotiate(SSL *s, unsigned int context, int sent, |
805a2e9e MC |
733 | int *al) |
734 | { | |
332eb390 MC |
735 | if (!s->server) { |
736 | /* | |
737 | * Check if we can connect to a server that doesn't support safe | |
738 | * renegotiation | |
739 | */ | |
740 | if (!(s->options & SSL_OP_LEGACY_SERVER_CONNECT) | |
741 | && !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION) | |
742 | && !sent) { | |
743 | *al = SSL_AD_HANDSHAKE_FAILURE; | |
7fe97c07 | 744 | SSLerr(SSL_F_FINAL_RENEGOTIATE, |
332eb390 MC |
745 | SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED); |
746 | return 0; | |
747 | } | |
748 | ||
805a2e9e | 749 | return 1; |
332eb390 | 750 | } |
805a2e9e MC |
751 | |
752 | /* Need RI if renegotiating */ | |
753 | if (s->renegotiate | |
754 | && !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION) | |
755 | && !sent) { | |
756 | *al = SSL_AD_HANDSHAKE_FAILURE; | |
7fe97c07 | 757 | SSLerr(SSL_F_FINAL_RENEGOTIATE, |
805a2e9e MC |
758 | SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED); |
759 | return 0; | |
760 | } | |
761 | ||
332eb390 | 762 | |
805a2e9e MC |
763 | return 1; |
764 | } | |
765 | ||
1266eefd | 766 | static int init_server_name(SSL *s, unsigned int context) |
805a2e9e MC |
767 | { |
768 | if (s->server) | |
769 | s->servername_done = 0; | |
770 | ||
771 | return 1; | |
772 | } | |
773 | ||
1266eefd | 774 | static int final_server_name(SSL *s, unsigned int context, int sent, |
805a2e9e MC |
775 | int *al) |
776 | { | |
777 | int ret = SSL_TLSEXT_ERR_NOACK; | |
778 | int altmp = SSL_AD_UNRECOGNIZED_NAME; | |
779 | ||
aff8c126 RS |
780 | if (s->ctx != NULL && s->ctx->ext.servername_cb != 0) |
781 | ret = s->ctx->ext.servername_cb(s, &altmp, | |
782 | s->ctx->ext.servername_arg); | |
222da979 TS |
783 | else if (s->session_ctx != NULL |
784 | && s->session_ctx->ext.servername_cb != 0) | |
785 | ret = s->session_ctx->ext.servername_cb(s, &altmp, | |
786 | s->session_ctx->ext.servername_arg); | |
805a2e9e MC |
787 | |
788 | switch (ret) { | |
789 | case SSL_TLSEXT_ERR_ALERT_FATAL: | |
790 | *al = altmp; | |
791 | return 0; | |
792 | ||
793 | case SSL_TLSEXT_ERR_ALERT_WARNING: | |
794 | *al = altmp; | |
795 | return 1; | |
796 | ||
797 | case SSL_TLSEXT_ERR_NOACK: | |
798 | s->servername_done = 0; | |
799 | return 1; | |
800 | ||
801 | default: | |
802 | return 1; | |
803 | } | |
804 | } | |
805 | ||
332eb390 | 806 | #ifndef OPENSSL_NO_EC |
1266eefd | 807 | static int final_ec_pt_formats(SSL *s, unsigned int context, int sent, |
332eb390 MC |
808 | int *al) |
809 | { | |
810 | unsigned long alg_k, alg_a; | |
811 | ||
812 | if (s->server) | |
813 | return 1; | |
814 | ||
815 | alg_k = s->s3->tmp.new_cipher->algorithm_mkey; | |
816 | alg_a = s->s3->tmp.new_cipher->algorithm_auth; | |
817 | ||
818 | /* | |
819 | * If we are client and using an elliptic curve cryptography cipher | |
820 | * suite, then if server returns an EC point formats lists extension it | |
821 | * must contain uncompressed. | |
822 | */ | |
aff8c126 RS |
823 | if (s->ext.ecpointformats != NULL |
824 | && s->ext.ecpointformats_len > 0 | |
825 | && s->session->ext.ecpointformats != NULL | |
826 | && s->session->ext.ecpointformats_len > 0 | |
1266eefd | 827 | && ((alg_k & SSL_kECDHE) || (alg_a & SSL_aECDSA))) { |
332eb390 MC |
828 | /* we are using an ECC cipher */ |
829 | size_t i; | |
aff8c126 | 830 | unsigned char *list = s->session->ext.ecpointformats; |
1266eefd | 831 | |
aff8c126 | 832 | for (i = 0; i < s->session->ext.ecpointformats_len; i++) { |
1266eefd | 833 | if (*list++ == TLSEXT_ECPOINTFORMAT_uncompressed) |
332eb390 | 834 | break; |
332eb390 | 835 | } |
aff8c126 | 836 | if (i == s->session->ext.ecpointformats_len) { |
7fe97c07 | 837 | SSLerr(SSL_F_FINAL_EC_PT_FORMATS, |
332eb390 MC |
838 | SSL_R_TLS_INVALID_ECPOINTFORMAT_LIST); |
839 | return 0; | |
840 | } | |
841 | } | |
842 | ||
843 | return 1; | |
844 | } | |
845 | #endif | |
846 | ||
1266eefd | 847 | static int init_session_ticket(SSL *s, unsigned int context) |
332eb390 MC |
848 | { |
849 | if (!s->server) | |
aff8c126 | 850 | s->ext.ticket_expected = 0; |
332eb390 MC |
851 | |
852 | return 1; | |
853 | } | |
854 | ||
8f8c11d8 | 855 | #ifndef OPENSSL_NO_OCSP |
1266eefd | 856 | static int init_status_request(SSL *s, unsigned int context) |
805a2e9e | 857 | { |
f63e4288 | 858 | if (s->server) { |
aff8c126 | 859 | s->ext.status_type = TLSEXT_STATUSTYPE_nothing; |
f63e4288 MC |
860 | } else { |
861 | /* | |
862 | * Ensure we get sensible values passed to tlsext_status_cb in the event | |
863 | * that we don't receive a status message | |
864 | */ | |
8cbfcc70 RS |
865 | OPENSSL_free(s->ext.ocsp.resp); |
866 | s->ext.ocsp.resp = NULL; | |
867 | s->ext.ocsp.resp_len = 0; | |
f63e4288 | 868 | } |
332eb390 MC |
869 | |
870 | return 1; | |
871 | } | |
8f8c11d8 | 872 | #endif |
332eb390 | 873 | |
805a2e9e | 874 | #ifndef OPENSSL_NO_NEXTPROTONEG |
1266eefd | 875 | static int init_npn(SSL *s, unsigned int context) |
805a2e9e | 876 | { |
aff8c126 | 877 | s->s3->npn_seen = 0; |
805a2e9e MC |
878 | |
879 | return 1; | |
880 | } | |
881 | #endif | |
882 | ||
1266eefd | 883 | static int init_alpn(SSL *s, unsigned int context) |
805a2e9e | 884 | { |
332eb390 MC |
885 | OPENSSL_free(s->s3->alpn_selected); |
886 | s->s3->alpn_selected = NULL; | |
a5bb1aa1 | 887 | s->s3->alpn_selected_len = 0; |
805a2e9e | 888 | if (s->server) { |
805a2e9e MC |
889 | OPENSSL_free(s->s3->alpn_proposed); |
890 | s->s3->alpn_proposed = NULL; | |
891 | s->s3->alpn_proposed_len = 0; | |
892 | } | |
805a2e9e MC |
893 | return 1; |
894 | } | |
895 | ||
1266eefd | 896 | static int final_alpn(SSL *s, unsigned int context, int sent, int *al) |
02f0274e MC |
897 | { |
898 | const unsigned char *selected = NULL; | |
899 | unsigned char selected_len = 0; | |
900 | ||
901 | if (!s->server) | |
902 | return 1; | |
903 | ||
aff8c126 RS |
904 | if (s->ctx->ext.alpn_select_cb != NULL && s->s3->alpn_proposed != NULL) { |
905 | int r = s->ctx->ext.alpn_select_cb(s, &selected, &selected_len, | |
906 | s->s3->alpn_proposed, | |
907 | (unsigned int)s->s3->alpn_proposed_len, | |
908 | s->ctx->ext.alpn_select_cb_arg); | |
02f0274e MC |
909 | |
910 | if (r == SSL_TLSEXT_ERR_OK) { | |
911 | OPENSSL_free(s->s3->alpn_selected); | |
912 | s->s3->alpn_selected = OPENSSL_memdup(selected, selected_len); | |
913 | if (s->s3->alpn_selected == NULL) { | |
914 | *al = SSL_AD_INTERNAL_ERROR; | |
915 | return 0; | |
916 | } | |
917 | s->s3->alpn_selected_len = selected_len; | |
918 | #ifndef OPENSSL_NO_NEXTPROTONEG | |
919 | /* ALPN takes precedence over NPN. */ | |
aff8c126 | 920 | s->s3->npn_seen = 0; |
02f0274e MC |
921 | #endif |
922 | } else { | |
923 | *al = SSL_AD_NO_APPLICATION_PROTOCOL; | |
924 | return 0; | |
925 | } | |
926 | } | |
927 | ||
928 | return 1; | |
929 | } | |
930 | ||
1266eefd | 931 | static int init_sig_algs(SSL *s, unsigned int context) |
805a2e9e MC |
932 | { |
933 | /* Clear any signature algorithms extension received */ | |
934 | OPENSSL_free(s->s3->tmp.peer_sigalgs); | |
935 | s->s3->tmp.peer_sigalgs = NULL; | |
936 | ||
937 | return 1; | |
938 | } | |
939 | ||
940 | #ifndef OPENSSL_NO_SRP | |
1266eefd | 941 | static int init_srp(SSL *s, unsigned int context) |
805a2e9e MC |
942 | { |
943 | OPENSSL_free(s->srp_ctx.login); | |
944 | s->srp_ctx.login = NULL; | |
945 | ||
946 | return 1; | |
947 | } | |
948 | #endif | |
949 | ||
1266eefd | 950 | static int init_etm(SSL *s, unsigned int context) |
805a2e9e | 951 | { |
28a31a0a | 952 | s->ext.use_etm = 0; |
332eb390 MC |
953 | |
954 | return 1; | |
955 | } | |
956 | ||
1266eefd | 957 | static int init_ems(SSL *s, unsigned int context) |
332eb390 MC |
958 | { |
959 | if (!s->server) | |
960 | s->s3->flags &= ~TLS1_FLAGS_RECEIVED_EXTMS; | |
961 | ||
962 | return 1; | |
963 | } | |
964 | ||
1266eefd | 965 | static int final_ems(SSL *s, unsigned int context, int sent, int *al) |
332eb390 MC |
966 | { |
967 | if (!s->server && s->hit) { | |
968 | /* | |
969 | * Check extended master secret extension is consistent with | |
970 | * original session. | |
971 | */ | |
972 | if (!(s->s3->flags & TLS1_FLAGS_RECEIVED_EXTMS) != | |
973 | !(s->session->flags & SSL_SESS_FLAG_EXTMS)) { | |
974 | *al = SSL_AD_HANDSHAKE_FAILURE; | |
7fe97c07 | 975 | SSLerr(SSL_F_FINAL_EMS, SSL_R_INCONSISTENT_EXTMS); |
332eb390 MC |
976 | return 0; |
977 | } | |
978 | } | |
805a2e9e MC |
979 | |
980 | return 1; | |
981 | } | |
982 | ||
45615c5f DSH |
983 | static int init_certificate_authorities(SSL *s, unsigned int context) |
984 | { | |
fa7c2637 DSH |
985 | sk_X509_NAME_pop_free(s->s3->tmp.peer_ca_names, X509_NAME_free); |
986 | s->s3->tmp.peer_ca_names = NULL; | |
45615c5f DSH |
987 | return 1; |
988 | } | |
989 | ||
990 | static int tls_construct_certificate_authorities(SSL *s, WPACKET *pkt, | |
991 | unsigned int context, X509 *x, | |
992 | size_t chainidx, int *al) | |
993 | { | |
9784ec04 | 994 | const STACK_OF(X509_NAME) *ca_sk = SSL_get0_CA_list(s); |
45615c5f DSH |
995 | |
996 | if (ca_sk == NULL || sk_X509_NAME_num(ca_sk) == 0) | |
997 | return 1; | |
998 | ||
999 | if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_certificate_authorities) | |
1000 | || !WPACKET_start_sub_packet_u16(pkt) | |
1001 | || !construct_ca_names(s, pkt) | |
1002 | || !WPACKET_close(pkt)) { | |
1003 | SSLerr(SSL_F_TLS_CONSTRUCT_CERTIFICATE_AUTHORITIES, | |
1004 | ERR_R_INTERNAL_ERROR); | |
1005 | return 0; | |
1006 | } | |
1007 | ||
1008 | return 1; | |
1009 | } | |
1010 | ||
1011 | static int tls_parse_certificate_authorities(SSL *s, PACKET *pkt, | |
1012 | unsigned int context, X509 *x, | |
1013 | size_t chainidx, int *al) | |
1014 | { | |
1015 | if (!parse_ca_names(s, pkt, al)) | |
1016 | return 0; | |
1017 | if (PACKET_remaining(pkt) != 0) { | |
1018 | *al = SSL_AD_DECODE_ERROR; | |
1019 | return 0; | |
1020 | } | |
1021 | return 1; | |
1022 | } | |
1023 | ||
805a2e9e | 1024 | #ifndef OPENSSL_NO_SRTP |
1266eefd | 1025 | static int init_srtp(SSL *s, unsigned int context) |
805a2e9e MC |
1026 | { |
1027 | if (s->server) | |
1028 | s->srtp_profile = NULL; | |
1029 | ||
1030 | return 1; | |
1031 | } | |
1032 | #endif | |
04904312 MC |
1033 | |
1034 | static int final_sig_algs(SSL *s, unsigned int context, int sent, int *al) | |
1035 | { | |
1036 | if (!sent && SSL_IS_TLS13(s)) { | |
1037 | *al = TLS13_AD_MISSING_EXTENSION; | |
1038 | SSLerr(SSL_F_FINAL_SIG_ALGS, SSL_R_MISSING_SIGALGS_EXTENSION); | |
1039 | return 0; | |
1040 | } | |
1041 | ||
1042 | return 1; | |
1043 | } | |
b2f7e8c0 | 1044 | |
deb2d5e7 | 1045 | #ifndef OPENSSL_NO_EC |
f4bbb37c MC |
1046 | static int final_key_share(SSL *s, unsigned int context, int sent, int *al) |
1047 | { | |
1048 | if (!SSL_IS_TLS13(s)) | |
1049 | return 1; | |
1050 | ||
1051 | /* | |
1052 | * If | |
aff9929b MC |
1053 | * we are a client |
1054 | * AND | |
f4bbb37c MC |
1055 | * we have no key_share |
1056 | * AND | |
1057 | * (we are not resuming | |
1058 | * OR the kex_mode doesn't allow non key_share resumes) | |
1059 | * THEN | |
aff9929b | 1060 | * fail; |
f4bbb37c | 1061 | */ |
aff9929b MC |
1062 | if (!s->server |
1063 | && !sent | |
f4bbb37c MC |
1064 | && (!s->hit |
1065 | || (s->ext.psk_kex_mode & TLSEXT_KEX_MODE_FLAG_KE) == 0)) { | |
7d061fce | 1066 | /* Nothing left we can do - just fail */ |
f4bbb37c MC |
1067 | *al = SSL_AD_HANDSHAKE_FAILURE; |
1068 | SSLerr(SSL_F_FINAL_KEY_SHARE, SSL_R_NO_SUITABLE_KEY_SHARE); | |
1069 | return 0; | |
1070 | } | |
aff9929b MC |
1071 | /* |
1072 | * If | |
1073 | * we are a server | |
1074 | * AND | |
1075 | * we have no key_share | |
1076 | * THEN | |
1077 | * If | |
1078 | * we didn't already send a HelloRetryRequest | |
1079 | * AND | |
1080 | * the client sent a key_share extension | |
1081 | * AND | |
1082 | * (we are not resuming | |
1083 | * OR the kex_mode allows key_share resumes) | |
1084 | * AND | |
1085 | * a shared group exists | |
1086 | * THEN | |
1087 | * send a HelloRetryRequest | |
1088 | * ELSE If | |
1089 | * we are not resuming | |
1090 | * OR | |
1091 | * the kex_mode doesn't allow non key_share resumes | |
1092 | * THEN | |
1093 | * fail; | |
1094 | */ | |
1095 | if (s->server && s->s3->peer_tmp == NULL) { | |
1096 | /* No suitable share */ | |
1097 | if (s->hello_retry_request == 0 && sent | |
1098 | && (!s->hit | |
1099 | || (s->ext.psk_kex_mode & TLSEXT_KEX_MODE_FLAG_KE_DHE) | |
1100 | != 0)) { | |
1101 | const unsigned char *pcurves, *pcurvestmp, *clntcurves; | |
1102 | size_t num_curves, clnt_num_curves, i; | |
319a33d0 | 1103 | unsigned int group_id = 0; |
aff9929b | 1104 | |
2248dbeb | 1105 | /* Check if a shared group exists */ |
aff9929b MC |
1106 | |
1107 | /* Get the clients list of supported groups. */ | |
1108 | if (!tls1_get_curvelist(s, 1, &clntcurves, &clnt_num_curves)) { | |
1109 | *al = SSL_AD_INTERNAL_ERROR; | |
1110 | SSLerr(SSL_F_FINAL_KEY_SHARE, ERR_R_INTERNAL_ERROR); | |
1111 | return 0; | |
1112 | } | |
1113 | ||
1114 | /* Get our list of available groups */ | |
1115 | if (!tls1_get_curvelist(s, 0, &pcurves, &num_curves)) { | |
1116 | *al = SSL_AD_INTERNAL_ERROR; | |
1117 | SSLerr(SSL_F_FINAL_KEY_SHARE, ERR_R_INTERNAL_ERROR); | |
1118 | return 0; | |
1119 | } | |
1120 | ||
1121 | /* Find the first group we allow that is also in client's list */ | |
1122 | for (i = 0, pcurvestmp = pcurves; i < num_curves; | |
1123 | i++, pcurvestmp += 2) { | |
0dd7ba24 | 1124 | group_id = bytestogroup(pcurvestmp); |
aff9929b MC |
1125 | |
1126 | if (check_in_list(s, group_id, clntcurves, clnt_num_curves, 1)) | |
1127 | break; | |
1128 | } | |
1129 | ||
1130 | if (i < num_curves) { | |
1131 | /* A shared group exists so send a HelloRetryRequest */ | |
1132 | s->s3->group_id = group_id; | |
1133 | s->hello_retry_request = 1; | |
1134 | return 1; | |
1135 | } | |
1136 | } | |
1137 | if (!s->hit | |
1138 | || (s->ext.psk_kex_mode & TLSEXT_KEX_MODE_FLAG_KE) == 0) { | |
1139 | /* Nothing left we can do - just fail */ | |
1140 | *al = SSL_AD_HANDSHAKE_FAILURE; | |
1141 | SSLerr(SSL_F_FINAL_KEY_SHARE, SSL_R_NO_SUITABLE_KEY_SHARE); | |
1142 | return 0; | |
1143 | } | |
1144 | } | |
1145 | ||
1146 | /* We have a key_share so don't send any more HelloRetryRequest messages */ | |
1147 | if (s->server) | |
1148 | s->hello_retry_request = 0; | |
f4bbb37c MC |
1149 | |
1150 | /* | |
1151 | * For a client side resumption with no key_share we need to generate | |
1152 | * the handshake secret (otherwise this is done during key_share | |
1153 | * processing). | |
1154 | */ | |
1155 | if (!sent && !s->server && !tls13_generate_handshake_secret(s, NULL, 0)) { | |
1156 | *al = SSL_AD_INTERNAL_ERROR; | |
1157 | SSLerr(SSL_F_FINAL_KEY_SHARE, ERR_R_INTERNAL_ERROR); | |
1158 | return 0; | |
1159 | } | |
1160 | ||
1161 | return 1; | |
1162 | } | |
deb2d5e7 | 1163 | #endif |
f4bbb37c | 1164 | |
b2f7e8c0 MC |
1165 | static int init_psk_kex_modes(SSL *s, unsigned int context) |
1166 | { | |
1167 | s->ext.psk_kex_mode = TLSEXT_KEX_MODE_FLAG_NONE; | |
b2f7e8c0 MC |
1168 | return 1; |
1169 | } | |
1053a6e2 MC |
1170 | |
1171 | int tls_psk_do_binder(SSL *s, const EVP_MD *md, const unsigned char *msgstart, | |
1172 | size_t binderoffset, const unsigned char *binderin, | |
1173 | unsigned char *binderout, | |
1174 | SSL_SESSION *sess, int sign) | |
1175 | { | |
1176 | EVP_PKEY *mackey = NULL; | |
1177 | EVP_MD_CTX *mctx = NULL; | |
1178 | unsigned char hash[EVP_MAX_MD_SIZE], binderkey[EVP_MAX_MD_SIZE]; | |
1179 | unsigned char finishedkey[EVP_MAX_MD_SIZE], tmpbinder[EVP_MAX_MD_SIZE]; | |
1180 | const char resumption_label[] = "resumption psk binder key"; | |
1f5b44e9 | 1181 | size_t bindersize, hashsize = EVP_MD_size(md); |
1053a6e2 MC |
1182 | int ret = -1; |
1183 | ||
1184 | /* Generate the early_secret */ | |
1185 | if (!tls13_generate_secret(s, md, NULL, sess->master_key, | |
1186 | sess->master_key_length, | |
1187 | (unsigned char *)&s->early_secret)) { | |
1188 | SSLerr(SSL_F_TLS_PSK_DO_BINDER, ERR_R_INTERNAL_ERROR); | |
1189 | goto err; | |
1190 | } | |
1191 | ||
1192 | /* | |
1193 | * Create the handshake hash for the binder key...the messages so far are | |
1194 | * empty! | |
1195 | */ | |
1196 | mctx = EVP_MD_CTX_new(); | |
1197 | if (mctx == NULL | |
1198 | || EVP_DigestInit_ex(mctx, md, NULL) <= 0 | |
1199 | || EVP_DigestFinal_ex(mctx, hash, NULL) <= 0) { | |
1200 | SSLerr(SSL_F_TLS_PSK_DO_BINDER, ERR_R_INTERNAL_ERROR); | |
1201 | goto err; | |
1202 | } | |
1203 | ||
1204 | /* Generate the binder key */ | |
1205 | if (!tls13_hkdf_expand(s, md, s->early_secret, | |
1206 | (unsigned char *)resumption_label, | |
1207 | sizeof(resumption_label) - 1, hash, binderkey, | |
1208 | hashsize)) { | |
1209 | SSLerr(SSL_F_TLS_PSK_DO_BINDER, ERR_R_INTERNAL_ERROR); | |
1210 | goto err; | |
1211 | } | |
1212 | ||
1213 | /* Generate the finished key */ | |
1214 | if (!tls13_derive_finishedkey(s, md, binderkey, finishedkey, hashsize)) { | |
1215 | SSLerr(SSL_F_TLS_PSK_DO_BINDER, ERR_R_INTERNAL_ERROR); | |
1216 | goto err; | |
1217 | } | |
1218 | ||
aff9929b MC |
1219 | if (EVP_DigestInit_ex(mctx, md, NULL) <= 0) { |
1220 | SSLerr(SSL_F_TLS_PSK_DO_BINDER, ERR_R_INTERNAL_ERROR); | |
1221 | goto err; | |
1222 | } | |
1223 | ||
1053a6e2 | 1224 | /* |
aff9929b MC |
1225 | * Get a hash of the ClientHello up to the start of the binders. If we are |
1226 | * following a HelloRetryRequest then this includes the hash of the first | |
1227 | * ClientHello and the HelloRetryRequest itself. | |
1053a6e2 | 1228 | */ |
aff9929b MC |
1229 | if (s->hello_retry_request) { |
1230 | size_t hdatalen; | |
1231 | void *hdata; | |
1232 | ||
1233 | hdatalen = BIO_get_mem_data(s->s3->handshake_buffer, &hdata); | |
1234 | if (hdatalen <= 0) { | |
1235 | SSLerr(SSL_F_TLS_PSK_DO_BINDER, SSL_R_BAD_HANDSHAKE_LENGTH); | |
1236 | goto err; | |
1237 | } | |
1238 | ||
1239 | /* | |
1240 | * For servers the handshake buffer data will include the second | |
1241 | * ClientHello - which we don't want - so we need to take that bit off. | |
1242 | */ | |
1243 | if (s->server) { | |
77815a02 MC |
1244 | PACKET hashprefix, msg; |
1245 | ||
1246 | /* Find how many bytes are left after the first two messages */ | |
1247 | if (!PACKET_buf_init(&hashprefix, hdata, hdatalen) | |
1248 | || !PACKET_forward(&hashprefix, 1) | |
1249 | || !PACKET_get_length_prefixed_3(&hashprefix, &msg) | |
1250 | || !PACKET_forward(&hashprefix, 1) | |
1251 | || !PACKET_get_length_prefixed_3(&hashprefix, &msg)) { | |
aff9929b MC |
1252 | SSLerr(SSL_F_TLS_PSK_DO_BINDER, ERR_R_INTERNAL_ERROR); |
1253 | goto err; | |
1254 | } | |
77815a02 | 1255 | hdatalen -= PACKET_remaining(&hashprefix); |
aff9929b MC |
1256 | } |
1257 | ||
1258 | if (EVP_DigestUpdate(mctx, hdata, hdatalen) <= 0) { | |
1259 | SSLerr(SSL_F_TLS_PSK_DO_BINDER, ERR_R_INTERNAL_ERROR); | |
1260 | goto err; | |
1261 | } | |
1262 | } | |
1263 | ||
1264 | if (EVP_DigestUpdate(mctx, msgstart, binderoffset) <= 0 | |
1053a6e2 MC |
1265 | || EVP_DigestFinal_ex(mctx, hash, NULL) <= 0) { |
1266 | SSLerr(SSL_F_TLS_PSK_DO_BINDER, ERR_R_INTERNAL_ERROR); | |
1267 | goto err; | |
1268 | } | |
1269 | ||
1270 | mackey = EVP_PKEY_new_mac_key(EVP_PKEY_HMAC, NULL, finishedkey, hashsize); | |
1271 | if (mackey == NULL) { | |
1272 | SSLerr(SSL_F_TLS_PSK_DO_BINDER, ERR_R_INTERNAL_ERROR); | |
1273 | goto err; | |
1274 | } | |
1275 | ||
1276 | if (!sign) | |
1277 | binderout = tmpbinder; | |
1278 | ||
1279 | bindersize = hashsize; | |
1280 | if (EVP_DigestSignInit(mctx, NULL, md, NULL, mackey) <= 0 | |
1281 | || EVP_DigestSignUpdate(mctx, hash, hashsize) <= 0 | |
1282 | || EVP_DigestSignFinal(mctx, binderout, &bindersize) <= 0 | |
1283 | || bindersize != hashsize) { | |
1284 | SSLerr(SSL_F_TLS_PSK_DO_BINDER, ERR_R_INTERNAL_ERROR); | |
1285 | goto err; | |
1286 | } | |
1287 | ||
1288 | if (sign) { | |
1289 | ret = 1; | |
1290 | } else { | |
1291 | /* HMAC keys can't do EVP_DigestVerify* - use CRYPTO_memcmp instead */ | |
1292 | ret = (CRYPTO_memcmp(binderin, binderout, hashsize) == 0); | |
1293 | } | |
1294 | ||
1295 | err: | |
1296 | OPENSSL_cleanse(binderkey, sizeof(binderkey)); | |
1297 | OPENSSL_cleanse(finishedkey, sizeof(finishedkey)); | |
1298 | EVP_PKEY_free(mackey); | |
1299 | EVP_MD_CTX_free(mctx); | |
1300 | ||
1301 | return ret; | |
1302 | } | |
38df5a45 MC |
1303 | |
1304 | static int final_early_data(SSL *s, unsigned int context, int sent, int *al) | |
1305 | { | |
1306 | if (!s->server || !sent) | |
1307 | return 1; | |
1308 | ||
1309 | if (s->max_early_data == 0 | |
1310 | || !s->hit | |
1311 | || s->session->ext.tick_identity != 0 | |
1312 | || s->early_data_state != SSL_EARLY_DATA_ACCEPTING | |
1313 | || !s->ext.early_data_ok | |
f6370040 MC |
1314 | || s->hello_retry_request |
1315 | || s->s3->alpn_selected_len != s->session->ext.alpn_selected_len | |
e6941c78 MC |
1316 | || (s->s3->alpn_selected_len > 0 |
1317 | && memcmp(s->s3->alpn_selected, s->session->ext.alpn_selected, | |
1318 | s->s3->alpn_selected_len) != 0)) { | |
38df5a45 MC |
1319 | s->ext.early_data = SSL_EARLY_DATA_REJECTED; |
1320 | } else { | |
1321 | s->ext.early_data = SSL_EARLY_DATA_ACCEPTED; | |
1322 | ||
1323 | if (!tls13_change_cipher_state(s, | |
1324 | SSL3_CC_EARLY | SSL3_CHANGE_CIPHER_SERVER_READ)) { | |
1325 | *al = SSL_AD_INTERNAL_ERROR; | |
1326 | return 0; | |
1327 | } | |
1328 | } | |
1329 | ||
1330 | return 1; | |
1331 | } |