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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 | ||
6b473aca MC |
10 | #include "../ssl_locl.h" |
11 | #include "statem_locl.h" | |
12 | ||
1266eefd | 13 | static int final_renegotiate(SSL *s, unsigned int context, int sent, |
805a2e9e | 14 | int *al); |
1266eefd MC |
15 | static int init_server_name(SSL *s, unsigned int context); |
16 | static int final_server_name(SSL *s, unsigned int context, int sent, | |
805a2e9e | 17 | int *al); |
332eb390 | 18 | #ifndef OPENSSL_NO_EC |
1266eefd | 19 | static int final_ec_pt_formats(SSL *s, unsigned int context, int sent, |
332eb390 MC |
20 | int *al); |
21 | #endif | |
1266eefd | 22 | static int init_session_ticket(SSL *s, unsigned int context); |
8f8c11d8 | 23 | #ifndef OPENSSL_NO_OCSP |
1266eefd | 24 | static int init_status_request(SSL *s, unsigned int context); |
8f8c11d8 | 25 | #endif |
805a2e9e | 26 | #ifndef OPENSSL_NO_NEXTPROTONEG |
1266eefd | 27 | static int init_npn(SSL *s, unsigned int context); |
805a2e9e | 28 | #endif |
1266eefd MC |
29 | static int init_alpn(SSL *s, unsigned int context); |
30 | static int final_alpn(SSL *s, unsigned int context, int sent, int *al); | |
31 | static int init_sig_algs(SSL *s, unsigned int context); | |
805a2e9e | 32 | #ifndef OPENSSL_NO_SRP |
1266eefd | 33 | static int init_srp(SSL *s, unsigned int context); |
805a2e9e | 34 | #endif |
1266eefd MC |
35 | static int init_etm(SSL *s, unsigned int context); |
36 | static int init_ems(SSL *s, unsigned int context); | |
37 | static int final_ems(SSL *s, unsigned int context, int sent, int *al); | |
b2f7e8c0 | 38 | static int init_psk_kex_modes(SSL *s, unsigned int context); |
deb2d5e7 | 39 | #ifndef OPENSSL_NO_EC |
f4bbb37c | 40 | static int final_key_share(SSL *s, unsigned int context, int sent, int *al); |
deb2d5e7 | 41 | #endif |
805a2e9e | 42 | #ifndef OPENSSL_NO_SRTP |
1266eefd | 43 | static int init_srtp(SSL *s, unsigned int context); |
805a2e9e | 44 | #endif |
04904312 | 45 | static int final_sig_algs(SSL *s, unsigned int context, int sent, int *al); |
805a2e9e | 46 | |
70af3d8e | 47 | /* Structure to define a built-in extension */ |
1266eefd MC |
48 | typedef struct extensions_definition_st { |
49 | /* The defined type for the extension */ | |
6b473aca | 50 | unsigned int type; |
1266eefd MC |
51 | /* |
52 | * The context that this extension applies to, e.g. what messages and | |
53 | * protocol versions | |
54 | */ | |
55 | unsigned int context; | |
68db4dda | 56 | /* |
805a2e9e MC |
57 | * Initialise extension before parsing. Always called for relevant contexts |
58 | * even if extension not present | |
68db4dda | 59 | */ |
1266eefd MC |
60 | int (*init)(SSL *s, unsigned int context); |
61 | /* Parse extension sent from client to server */ | |
61138358 MC |
62 | int (*parse_ctos)(SSL *s, PACKET *pkt, unsigned int context, X509 *x, |
63 | size_t chainidx, int *al); | |
1266eefd | 64 | /* Parse extension send from server to client */ |
61138358 MC |
65 | int (*parse_stoc)(SSL *s, PACKET *pkt, unsigned int context, X509 *x, |
66 | size_t chainidx, int *al); | |
1266eefd | 67 | /* Construct extension sent from server to client */ |
61138358 MC |
68 | int (*construct_stoc)(SSL *s, WPACKET *pkt, unsigned int context, X509 *x, |
69 | size_t chainidx, int *al); | |
1266eefd | 70 | /* Construct extension sent from client to server */ |
61138358 MC |
71 | int (*construct_ctos)(SSL *s, WPACKET *pkt, unsigned int context, X509 *x, |
72 | size_t chainidx, int *al); | |
68db4dda | 73 | /* |
805a2e9e MC |
74 | * Finalise extension after parsing. Always called where an extensions was |
75 | * initialised even if the extension was not present. |sent| is set to 1 if | |
76 | * the extension was seen, or 0 otherwise. | |
68db4dda | 77 | */ |
1266eefd | 78 | int (*final)(SSL *s, unsigned int context, int sent, int *al); |
6b473aca MC |
79 | } EXTENSION_DEFINITION; |
80 | ||
4b299b8e | 81 | /* |
70af3d8e | 82 | * Definitions of all built-in extensions. NOTE: Changes in the number or order |
3e6c1da8 F |
83 | * of these extensions should be mirrored with equivalent changes to the |
84 | * indexes ( TLSEXT_IDX_* ) defined in ssl_locl.h. | |
70af3d8e MC |
85 | * Each extension has an initialiser, a client and |
86 | * server side parser and a finaliser. The initialiser is called (if the | |
87 | * extension is relevant to the given context) even if we did not see the | |
88 | * extension in the message that we received. The parser functions are only | |
89 | * called if we see the extension in the message. The finalisers are always | |
90 | * called if the initialiser was called. | |
91 | * There are also server and client side constructor functions which are always | |
92 | * called during message construction if the extension is relevant for the | |
93 | * given context. | |
94 | * The initialisation, parsing, finalisation and construction functions are | |
95 | * always called in the order defined in this list. Some extensions may depend | |
96 | * on others having been processed first, so the order of this list is | |
97 | * significant. | |
98 | * The extension context is defined by a series of flags which specify which | |
99 | * messages the extension is relevant to. These flags also specify whether the | |
3e6c1da8 | 100 | * extension is relevant to a particular protocol or protocol version. |
a1448c26 | 101 | * |
70af3d8e | 102 | * TODO(TLS1.3): Make sure we have a test to check the consistency of these |
4b299b8e | 103 | */ |
0785274c | 104 | #define INVALID_EXTENSION { 0x10000, 0, NULL, NULL, NULL, NULL, NULL, NULL } |
6b473aca MC |
105 | static const EXTENSION_DEFINITION ext_defs[] = { |
106 | { | |
107 | TLSEXT_TYPE_renegotiate, | |
6b473aca | 108 | EXT_CLIENT_HELLO | EXT_TLS1_2_SERVER_HELLO | EXT_SSL3_ALLOWED |
1266eefd MC |
109 | | EXT_TLS1_2_AND_BELOW_ONLY, |
110 | NULL, tls_parse_ctos_renegotiate, tls_parse_stoc_renegotiate, | |
111 | tls_construct_stoc_renegotiate, tls_construct_ctos_renegotiate, | |
112 | final_renegotiate | |
6b473aca MC |
113 | }, |
114 | { | |
115 | TLSEXT_TYPE_server_name, | |
6b473aca | 116 | EXT_CLIENT_HELLO | EXT_TLS1_2_SERVER_HELLO |
1266eefd MC |
117 | | EXT_TLS1_3_ENCRYPTED_EXTENSIONS, |
118 | init_server_name, | |
119 | tls_parse_ctos_server_name, tls_parse_stoc_server_name, | |
120 | tls_construct_stoc_server_name, tls_construct_ctos_server_name, | |
121 | final_server_name | |
6b473aca MC |
122 | }, |
123 | #ifndef OPENSSL_NO_SRP | |
124 | { | |
125 | TLSEXT_TYPE_srp, | |
1266eefd MC |
126 | EXT_CLIENT_HELLO | EXT_TLS1_2_AND_BELOW_ONLY, |
127 | init_srp, tls_parse_ctos_srp, NULL, NULL, tls_construct_ctos_srp, NULL | |
6b473aca | 128 | }, |
0785274c MC |
129 | #else |
130 | INVALID_EXTENSION, | |
6b473aca | 131 | #endif |
3fc8d856 MC |
132 | { |
133 | TLSEXT_TYPE_early_data_info, | |
134 | EXT_TLS1_3_NEW_SESSION_TICKET, | |
5d5b3fba MC |
135 | NULL, NULL, tls_parse_stoc_early_data_info, |
136 | tls_construct_stoc_early_data_info, NULL, NULL | |
3fc8d856 | 137 | }, |
a4f376af MC |
138 | { |
139 | TLSEXT_TYPE_early_data, | |
140 | EXT_CLIENT_HELLO | EXT_TLS1_3_ENCRYPTED_EXTENSIONS, | |
0a87d0ac MC |
141 | NULL, tls_parse_ctos_early_data, NULL, NULL, |
142 | tls_construct_ctos_early_data, NULL | |
a4f376af | 143 | }, |
6b473aca MC |
144 | #ifndef OPENSSL_NO_EC |
145 | { | |
146 | TLSEXT_TYPE_ec_point_formats, | |
3b58c54f | 147 | EXT_CLIENT_HELLO | EXT_TLS1_2_SERVER_HELLO | EXT_TLS1_2_AND_BELOW_ONLY, |
1266eefd MC |
148 | NULL, tls_parse_ctos_ec_pt_formats, tls_parse_stoc_ec_pt_formats, |
149 | tls_construct_stoc_ec_pt_formats, tls_construct_ctos_ec_pt_formats, | |
150 | final_ec_pt_formats | |
6b473aca MC |
151 | }, |
152 | { | |
153 | TLSEXT_TYPE_supported_groups, | |
1266eefd MC |
154 | EXT_CLIENT_HELLO | EXT_TLS1_3_ENCRYPTED_EXTENSIONS, |
155 | NULL, tls_parse_ctos_supported_groups, NULL, | |
7da160b0 | 156 | NULL /* TODO(TLS1.3): Need to add this */, |
1266eefd | 157 | tls_construct_ctos_supported_groups, NULL |
6b473aca | 158 | }, |
0785274c MC |
159 | #else |
160 | INVALID_EXTENSION, | |
161 | INVALID_EXTENSION, | |
6b473aca MC |
162 | #endif |
163 | { | |
164 | TLSEXT_TYPE_session_ticket, | |
1266eefd MC |
165 | EXT_CLIENT_HELLO | EXT_TLS1_2_SERVER_HELLO | EXT_TLS1_2_AND_BELOW_ONLY, |
166 | init_session_ticket, tls_parse_ctos_session_ticket, | |
167 | tls_parse_stoc_session_ticket, tls_construct_stoc_session_ticket, | |
168 | tls_construct_ctos_session_ticket, NULL | |
6b473aca MC |
169 | }, |
170 | { | |
171 | TLSEXT_TYPE_signature_algorithms, | |
1266eefd MC |
172 | EXT_CLIENT_HELLO, |
173 | init_sig_algs, tls_parse_ctos_sig_algs, NULL, NULL, | |
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, | |
4b299b8e | 179 | EXT_CLIENT_HELLO | EXT_TLS1_2_SERVER_HELLO |
1266eefd MC |
180 | | EXT_TLS1_3_CERTIFICATE, |
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, | |
1266eefd MC |
191 | EXT_CLIENT_HELLO | EXT_TLS1_2_SERVER_HELLO | EXT_TLS1_2_AND_BELOW_ONLY, |
192 | init_npn, tls_parse_ctos_npn, tls_parse_stoc_npn, | |
193 | tls_construct_stoc_next_proto_neg, tls_construct_ctos_npn, NULL | |
6b473aca | 194 | }, |
0785274c MC |
195 | #else |
196 | INVALID_EXTENSION, | |
6b473aca MC |
197 | #endif |
198 | { | |
02f0274e MC |
199 | /* |
200 | * Must appear in this list after server_name so that finalisation | |
201 | * happens after server_name callbacks | |
202 | */ | |
6b473aca | 203 | TLSEXT_TYPE_application_layer_protocol_negotiation, |
6b473aca | 204 | EXT_CLIENT_HELLO | EXT_TLS1_2_SERVER_HELLO |
1266eefd MC |
205 | | EXT_TLS1_3_ENCRYPTED_EXTENSIONS, |
206 | init_alpn, tls_parse_ctos_alpn, tls_parse_stoc_alpn, | |
207 | tls_construct_stoc_alpn, tls_construct_ctos_alpn, final_alpn | |
6b473aca | 208 | }, |
7da160b0 | 209 | #ifndef OPENSSL_NO_SRTP |
6b473aca MC |
210 | { |
211 | TLSEXT_TYPE_use_srtp, | |
6b473aca | 212 | EXT_CLIENT_HELLO | EXT_TLS1_2_SERVER_HELLO |
1266eefd MC |
213 | | EXT_TLS1_3_ENCRYPTED_EXTENSIONS | EXT_DTLS_ONLY, |
214 | init_srtp, tls_parse_ctos_use_srtp, tls_parse_stoc_use_srtp, | |
215 | tls_construct_stoc_use_srtp, tls_construct_ctos_use_srtp, NULL | |
6b473aca | 216 | }, |
0785274c MC |
217 | #else |
218 | INVALID_EXTENSION, | |
7da160b0 | 219 | #endif |
6b473aca MC |
220 | { |
221 | TLSEXT_TYPE_encrypt_then_mac, | |
28a31a0a | 222 | EXT_CLIENT_HELLO | EXT_TLS1_2_SERVER_HELLO | EXT_TLS1_2_AND_BELOW_ONLY | EXT_SSL3_ALLOWED, |
1266eefd MC |
223 | init_etm, tls_parse_ctos_etm, tls_parse_stoc_etm, |
224 | tls_construct_stoc_etm, tls_construct_ctos_etm, NULL | |
6b473aca | 225 | }, |
6dd083fd | 226 | #ifndef OPENSSL_NO_CT |
6b473aca MC |
227 | { |
228 | TLSEXT_TYPE_signed_certificate_timestamp, | |
1266eefd MC |
229 | EXT_CLIENT_HELLO | EXT_TLS1_2_SERVER_HELLO |
230 | | EXT_TLS1_3_CERTIFICATE, | |
68db4dda | 231 | NULL, |
6b473aca MC |
232 | /* |
233 | * No server side support for this, but can be provided by a custom | |
234 | * extension. This is an exception to the rule that custom extensions | |
235 | * cannot override built in ones. | |
236 | */ | |
1266eefd | 237 | NULL, tls_parse_stoc_sct, NULL, tls_construct_ctos_sct, NULL |
6b473aca | 238 | }, |
0785274c MC |
239 | #else |
240 | INVALID_EXTENSION, | |
6dd083fd | 241 | #endif |
6b473aca MC |
242 | { |
243 | TLSEXT_TYPE_extended_master_secret, | |
1266eefd MC |
244 | EXT_CLIENT_HELLO | EXT_TLS1_2_SERVER_HELLO | EXT_TLS1_2_AND_BELOW_ONLY, |
245 | init_ems, tls_parse_ctos_ems, tls_parse_stoc_ems, | |
246 | tls_construct_stoc_ems, tls_construct_ctos_ems, final_ems | |
6b473aca MC |
247 | }, |
248 | { | |
249 | TLSEXT_TYPE_supported_versions, | |
1266eefd | 250 | EXT_CLIENT_HELLO | EXT_TLS_IMPLEMENTATION_ONLY | EXT_TLS1_3_ONLY, |
68db4dda | 251 | NULL, |
6b473aca | 252 | /* Processed inline as part of version selection */ |
1266eefd | 253 | NULL, NULL, NULL, tls_construct_ctos_supported_versions, NULL |
6b473aca | 254 | }, |
b2f7e8c0 | 255 | { |
b2f7e8c0 MC |
256 | TLSEXT_TYPE_psk_kex_modes, |
257 | EXT_CLIENT_HELLO | EXT_TLS_IMPLEMENTATION_ONLY | EXT_TLS1_3_ONLY, | |
258 | init_psk_kex_modes, tls_parse_ctos_psk_kex_modes, NULL, NULL, | |
259 | tls_construct_ctos_psk_kex_modes, NULL | |
260 | }, | |
deb2d5e7 | 261 | #ifndef OPENSSL_NO_EC |
6b473aca | 262 | { |
70af3d8e MC |
263 | /* |
264 | * Must be in this list after supported_groups. We need that to have | |
265 | * been parsed before we do this one. | |
266 | */ | |
6b473aca | 267 | TLSEXT_TYPE_key_share, |
6b473aca MC |
268 | EXT_CLIENT_HELLO | EXT_TLS1_3_SERVER_HELLO |
269 | | EXT_TLS1_3_HELLO_RETRY_REQUEST | EXT_TLS_IMPLEMENTATION_ONLY | |
1266eefd MC |
270 | | EXT_TLS1_3_ONLY, |
271 | NULL, tls_parse_ctos_key_share, tls_parse_stoc_key_share, | |
f4bbb37c MC |
272 | tls_construct_stoc_key_share, tls_construct_ctos_key_share, |
273 | final_key_share | |
7da160b0 | 274 | }, |
deb2d5e7 | 275 | #endif |
7da160b0 MC |
276 | { |
277 | /* | |
278 | * Special unsolicited ServerHello extension only used when | |
279 | * SSL_OP_CRYPTOPRO_TLSEXT_BUG is set | |
280 | */ | |
281 | TLSEXT_TYPE_cryptopro_bug, | |
1266eefd MC |
282 | EXT_TLS1_2_SERVER_HELLO | EXT_TLS1_2_AND_BELOW_ONLY, |
283 | NULL, NULL, NULL, tls_construct_stoc_cryptopro_bug, NULL, NULL | |
ab83e314 MC |
284 | }, |
285 | { | |
ec15acb6 MC |
286 | /* Must be immediately before pre_shared_key */ |
287 | /* TODO(TLS1.3): Fix me */ | |
ab83e314 | 288 | TLSEXT_TYPE_padding, |
1266eefd | 289 | EXT_CLIENT_HELLO, |
68db4dda | 290 | NULL, |
ab83e314 | 291 | /* We send this, but don't read it */ |
1266eefd | 292 | NULL, NULL, NULL, tls_construct_ctos_padding, NULL |
ec15acb6 MC |
293 | }, |
294 | { | |
295 | /* Required by the TLSv1.3 spec to always be the last extension */ | |
296 | TLSEXT_TYPE_psk, | |
297 | EXT_CLIENT_HELLO | EXT_TLS1_3_SERVER_HELLO | EXT_TLS_IMPLEMENTATION_ONLY | |
298 | | EXT_TLS1_3_ONLY, | |
0247086d | 299 | NULL, tls_parse_ctos_psk, tls_parse_stoc_psk, tls_construct_stoc_psk, |
1053a6e2 | 300 | tls_construct_ctos_psk, NULL |
6b473aca MC |
301 | } |
302 | }; | |
303 | ||
6b473aca MC |
304 | /* |
305 | * Verify whether we are allowed to use the extension |type| in the current | |
306 | * |context|. Returns 1 to indicate the extension is allowed or unknown or 0 to | |
70af3d8e MC |
307 | * indicate the extension is not allowed. If returning 1 then |*found| is set to |
308 | * 1 if we found a definition for the extension, and |*idx| is set to its index | |
6b473aca | 309 | */ |
70af3d8e | 310 | static int verify_extension(SSL *s, unsigned int context, unsigned int type, |
1266eefd MC |
311 | custom_ext_methods *meths, RAW_EXTENSION *rawexlist, |
312 | RAW_EXTENSION **found) | |
6b473aca MC |
313 | { |
314 | size_t i; | |
70af3d8e | 315 | size_t builtin_num = OSSL_NELEM(ext_defs); |
d270de32 | 316 | const EXTENSION_DEFINITION *thisext; |
6b473aca | 317 | |
1266eefd MC |
318 | for (i = 0, thisext = ext_defs; i < builtin_num; i++, thisext++) { |
319 | if (type == thisext->type) { | |
6b473aca | 320 | /* Check we're allowed to use this extension in this context */ |
1266eefd | 321 | if ((context & thisext->context) == 0) |
6b473aca MC |
322 | return 0; |
323 | ||
324 | if (SSL_IS_DTLS(s)) { | |
1266eefd | 325 | if ((thisext->context & EXT_TLS_ONLY) != 0) |
6b473aca | 326 | return 0; |
1266eefd | 327 | } else if ((thisext->context & EXT_DTLS_ONLY) != 0) { |
6b473aca MC |
328 | return 0; |
329 | } | |
330 | ||
1266eefd | 331 | *found = &rawexlist[i]; |
6b473aca MC |
332 | return 1; |
333 | } | |
334 | } | |
335 | ||
70af3d8e MC |
336 | if ((context & (EXT_CLIENT_HELLO | EXT_TLS1_2_SERVER_HELLO)) == 0) { |
337 | /* | |
338 | * Custom extensions only apply to <=TLS1.2. This extension is unknown | |
339 | * in this context - we allow it | |
340 | */ | |
1266eefd | 341 | *found = NULL; |
70af3d8e MC |
342 | return 1; |
343 | } | |
6b473aca | 344 | |
70af3d8e MC |
345 | /* Check the custom extensions */ |
346 | if (meths != NULL) { | |
347 | for (i = builtin_num; i < builtin_num + meths->meths_count; i++) { | |
348 | if (meths->meths[i - builtin_num].ext_type == type) { | |
1266eefd | 349 | *found = &rawexlist[i]; |
70af3d8e MC |
350 | return 1; |
351 | } | |
6b473aca MC |
352 | } |
353 | } | |
354 | ||
70af3d8e | 355 | /* Unknown extension. We allow it */ |
1266eefd | 356 | *found = NULL; |
70af3d8e | 357 | return 1; |
6b473aca MC |
358 | } |
359 | ||
70af3d8e MC |
360 | /* |
361 | * Check whether the context defined for an extension |extctx| means whether | |
362 | * the extension is relevant for the current context |thisctx| or not. Returns | |
363 | * 1 if the extension is relevant for this context, and 0 otherwise | |
364 | */ | |
805a2e9e MC |
365 | static int extension_is_relevant(SSL *s, unsigned int extctx, |
366 | unsigned int thisctx) | |
367 | { | |
368 | if ((SSL_IS_DTLS(s) | |
369 | && (extctx & EXT_TLS_IMPLEMENTATION_ONLY) != 0) | |
370 | || (s->version == SSL3_VERSION | |
371 | && (extctx & EXT_SSL3_ALLOWED) == 0) | |
372 | || (SSL_IS_TLS13(s) | |
373 | && (extctx & EXT_TLS1_2_AND_BELOW_ONLY) != 0) | |
374 | || (!SSL_IS_TLS13(s) && (extctx & EXT_TLS1_3_ONLY) != 0)) | |
375 | return 0; | |
376 | ||
377 | return 1; | |
378 | } | |
379 | ||
6b473aca MC |
380 | /* |
381 | * Gather a list of all the extensions from the data in |packet]. |context| | |
70af3d8e | 382 | * tells us which message this extension is for. The raw extension data is |
1266eefd MC |
383 | * stored in |*res| on success. In the event of an error the alert type to use |
384 | * is stored in |*al|. We don't actually process the content of the extensions | |
385 | * yet, except to check their types. This function also runs the initialiser | |
386 | * functions for all known extensions (whether we have collected them or not). | |
387 | * If successful the caller is responsible for freeing the contents of |*res|. | |
6b473aca MC |
388 | * |
389 | * Per http://tools.ietf.org/html/rfc5246#section-7.4.1.4, there may not be | |
390 | * more than one extension of the same type in a ClientHello or ServerHello. | |
391 | * This function returns 1 if all extensions are unique and we have parsed their | |
392 | * types, and 0 if the extensions contain duplicates, could not be successfully | |
1266eefd | 393 | * found, or an internal error occurred. We only check duplicates for |
70af3d8e | 394 | * extensions that we know about. We ignore others. |
6b473aca | 395 | */ |
6b473aca | 396 | int tls_collect_extensions(SSL *s, PACKET *packet, unsigned int context, |
fc5ece2e | 397 | RAW_EXTENSION **res, int *al, size_t *len) |
6b473aca MC |
398 | { |
399 | PACKET extensions = *packet; | |
d270de32 | 400 | size_t i = 0; |
fc5ece2e | 401 | size_t num_exts; |
70af3d8e | 402 | custom_ext_methods *exts = NULL; |
6b473aca | 403 | RAW_EXTENSION *raw_extensions = NULL; |
d270de32 | 404 | const EXTENSION_DEFINITION *thisexd; |
6b473aca | 405 | |
ecc2f938 MC |
406 | *res = NULL; |
407 | ||
70af3d8e MC |
408 | /* |
409 | * Initialise server side custom extensions. Client side is done during | |
410 | * construction of extensions for the ClientHello. | |
411 | */ | |
412 | if ((context & EXT_CLIENT_HELLO) != 0) { | |
413 | exts = &s->cert->srv_ext; | |
414 | custom_ext_init(&s->cert->srv_ext); | |
415 | } else if ((context & EXT_TLS1_2_SERVER_HELLO) != 0) { | |
416 | exts = &s->cert->cli_ext; | |
417 | } | |
418 | ||
fc5ece2e BK |
419 | num_exts = OSSL_NELEM(ext_defs) + (exts != NULL ? exts->meths_count : 0); |
420 | raw_extensions = OPENSSL_zalloc(num_exts * sizeof(*raw_extensions)); | |
70af3d8e MC |
421 | if (raw_extensions == NULL) { |
422 | *al = SSL_AD_INTERNAL_ERROR; | |
423 | SSLerr(SSL_F_TLS_COLLECT_EXTENSIONS, ERR_R_MALLOC_FAILURE); | |
424 | return 0; | |
425 | } | |
426 | ||
6b473aca MC |
427 | while (PACKET_remaining(&extensions) > 0) { |
428 | unsigned int type; | |
429 | PACKET extension; | |
1266eefd | 430 | RAW_EXTENSION *thisex; |
6b473aca MC |
431 | |
432 | if (!PACKET_get_net_2(&extensions, &type) || | |
433 | !PACKET_get_length_prefixed_2(&extensions, &extension)) { | |
434 | SSLerr(SSL_F_TLS_COLLECT_EXTENSIONS, SSL_R_BAD_EXTENSION); | |
70af3d8e | 435 | *al = SSL_AD_DECODE_ERROR; |
6b473aca MC |
436 | goto err; |
437 | } | |
70af3d8e MC |
438 | /* |
439 | * Verify this extension is allowed. We only check duplicates for | |
440 | * extensions that we recognise. | |
441 | */ | |
1266eefd MC |
442 | if (!verify_extension(s, context, type, exts, raw_extensions, &thisex) |
443 | || (thisex != NULL && thisex->present == 1)) { | |
6b473aca | 444 | SSLerr(SSL_F_TLS_COLLECT_EXTENSIONS, SSL_R_BAD_EXTENSION); |
70af3d8e | 445 | *al = SSL_AD_ILLEGAL_PARAMETER; |
6b473aca MC |
446 | goto err; |
447 | } | |
1266eefd MC |
448 | if (thisex != NULL) { |
449 | thisex->data = extension; | |
450 | thisex->present = 1; | |
451 | thisex->type = type; | |
6b473aca MC |
452 | } |
453 | } | |
454 | ||
68db4dda MC |
455 | /* |
456 | * Initialise all known extensions relevant to this context, whether we have | |
457 | * found them or not | |
458 | */ | |
1266eefd MC |
459 | for (thisexd = ext_defs, i = 0; i < OSSL_NELEM(ext_defs); i++, thisexd++) { |
460 | if(thisexd->init != NULL && (thisexd->context & context) != 0 | |
461 | && extension_is_relevant(s, thisexd->context, context) | |
462 | && !thisexd->init(s, context)) { | |
70af3d8e | 463 | *al = SSL_AD_INTERNAL_ERROR; |
68db4dda MC |
464 | goto err; |
465 | } | |
466 | } | |
467 | ||
6b473aca | 468 | *res = raw_extensions; |
fc5ece2e BK |
469 | if (len != NULL) |
470 | *len = num_exts; | |
6b473aca MC |
471 | return 1; |
472 | ||
473 | err: | |
474 | OPENSSL_free(raw_extensions); | |
475 | return 0; | |
476 | } | |
477 | ||
68db4dda | 478 | /* |
70af3d8e MC |
479 | * Runs the parser for a given extension with index |idx|. |exts| contains the |
480 | * list of all parsed extensions previously collected by | |
481 | * tls_collect_extensions(). The parser is only run if it is applicable for the | |
f97d4c37 MC |
482 | * given |context| and the parser has not already been run. If this is for a |
483 | * Certificate message, then we also provide the parser with the relevant | |
8521ced6 | 484 | * Certificate |x| and its position in the |chainidx| with 0 being the first |
f97d4c37 MC |
485 | * Certificate. Returns 1 on success or 0 on failure. In the event of a failure |
486 | * |*al| is populated with a suitable alert code. If an extension is not present | |
487 | * this counted as success. | |
68db4dda | 488 | */ |
d270de32 | 489 | int tls_parse_extension(SSL *s, TLSEXT_INDEX idx, int context, |
8521ced6 | 490 | RAW_EXTENSION *exts, X509 *x, size_t chainidx, int *al) |
6b473aca | 491 | { |
70af3d8e | 492 | RAW_EXTENSION *currext = &exts[idx]; |
61138358 MC |
493 | int (*parser)(SSL *s, PACKET *pkt, unsigned int context, X509 *x, |
494 | size_t chainidx, int *al) = NULL; | |
6b473aca | 495 | |
70af3d8e MC |
496 | /* Skip if the extension is not present */ |
497 | if (!currext->present) | |
498 | return 1; | |
6b473aca | 499 | |
aff8c126 RS |
500 | if (s->ext.debug_cb) |
501 | s->ext.debug_cb(s, !s->server, currext->type, | |
502 | PACKET_data(&currext->data), | |
503 | PACKET_remaining(&currext->data), | |
504 | s->ext.debug_arg); | |
6b473aca | 505 | |
70af3d8e MC |
506 | /* Skip if we've already parsed this extension */ |
507 | if (currext->parsed) | |
508 | return 1; | |
6b473aca | 509 | |
70af3d8e MC |
510 | currext->parsed = 1; |
511 | ||
512 | if (idx < OSSL_NELEM(ext_defs)) { | |
513 | /* We are handling a built-in extension */ | |
514 | const EXTENSION_DEFINITION *extdef = &ext_defs[idx]; | |
515 | ||
516 | /* Check if extension is defined for our protocol. If not, skip */ | |
517 | if (!extension_is_relevant(s, extdef->context, context)) | |
518 | return 1; | |
519 | ||
1266eefd | 520 | parser = s->server ? extdef->parse_ctos : extdef->parse_stoc; |
224135e9 | 521 | |
1266eefd | 522 | if (parser != NULL) |
61138358 | 523 | return parser(s, &currext->data, context, x, chainidx, al); |
6b473aca | 524 | |
70af3d8e MC |
525 | /* |
526 | * If the parser is NULL we fall through to the custom extension | |
527 | * processing | |
528 | */ | |
6b473aca MC |
529 | } |
530 | ||
70af3d8e MC |
531 | /* |
532 | * This is a custom extension. We only allow this if it is a non | |
533 | * resumed session on the server side. | |
8521ced6 | 534 | *chain |
70af3d8e MC |
535 | * TODO(TLS1.3): We only allow old style <=TLS1.2 custom extensions. |
536 | * We're going to need a new mechanism for TLS1.3 to specify which | |
537 | * messages to add the custom extensions to. | |
538 | */ | |
539 | if ((!s->hit || !s->server) | |
540 | && (context | |
541 | & (EXT_CLIENT_HELLO | EXT_TLS1_2_SERVER_HELLO)) != 0 | |
542 | && custom_ext_parse(s, s->server, currext->type, | |
543 | PACKET_data(&currext->data), | |
544 | PACKET_remaining(&currext->data), | |
545 | al) <= 0) | |
546 | return 0; | |
547 | ||
805a2e9e MC |
548 | return 1; |
549 | } | |
550 | ||
551 | /* | |
552 | * Parse all remaining extensions that have not yet been parsed. Also calls the | |
70af3d8e | 553 | * finalisation for all extensions at the end, whether we collected them or not. |
f97d4c37 MC |
554 | * Returns 1 for success or 0 for failure. If we are working on a Certificate |
555 | * message then we also pass the Certificate |x| and its position in the | |
8521ced6 MC |
556 | * |chainidx|, with 0 being the first certificate. On failure, |*al| is |
557 | * populated with a suitable alert code. | |
805a2e9e | 558 | */ |
f97d4c37 | 559 | int tls_parse_all_extensions(SSL *s, int context, RAW_EXTENSION *exts, X509 *x, |
8521ced6 | 560 | size_t chainidx, int *al) |
805a2e9e | 561 | { |
1266eefd | 562 | size_t i, numexts = OSSL_NELEM(ext_defs); |
d270de32 | 563 | const EXTENSION_DEFINITION *thisexd; |
805a2e9e | 564 | |
70af3d8e MC |
565 | /* Calculate the number of extensions in the extensions list */ |
566 | if ((context & EXT_CLIENT_HELLO) != 0) { | |
567 | numexts += s->cert->srv_ext.meths_count; | |
568 | } else if ((context & EXT_TLS1_2_SERVER_HELLO) != 0) { | |
569 | numexts += s->cert->cli_ext.meths_count; | |
570 | } | |
571 | ||
572 | /* Parse each extension in turn */ | |
1266eefd | 573 | for (i = 0; i < numexts; i++) { |
8521ced6 | 574 | if (!tls_parse_extension(s, i, context, exts, x, chainidx, al)) |
70af3d8e MC |
575 | return 0; |
576 | } | |
805a2e9e | 577 | |
68db4dda MC |
578 | /* |
579 | * Finalise all known extensions relevant to this context, whether we have | |
580 | * found them or not | |
581 | */ | |
1266eefd MC |
582 | for (i = 0, thisexd = ext_defs; i < OSSL_NELEM(ext_defs); i++, thisexd++) { |
583 | if(thisexd->final != NULL | |
584 | && (thisexd->context & context) != 0 | |
585 | && !thisexd->final(s, context, exts[i].present, al)) | |
68db4dda | 586 | return 0; |
68db4dda MC |
587 | } |
588 | ||
6b473aca MC |
589 | return 1; |
590 | } | |
591 | ||
592 | /* | |
70af3d8e | 593 | * Construct all the extensions relevant to the current |context| and write |
30aeba43 | 594 | * them to |pkt|. If this is an extension for a Certificate in a Certificate |
8521ced6 MC |
595 | * message, then |x| will be set to the Certificate we are handling, and |
596 | * |chainidx| will indicate the position in the chainidx we are processing (with | |
597 | * 0 being the first in the chain). Returns 1 on success or 0 on failure. If a | |
598 | * failure occurs then |al| is populated with a suitable alert code. On a | |
599 | * failure construction stops at the first extension to fail to construct. | |
6b473aca | 600 | */ |
224135e9 | 601 | int tls_construct_extensions(SSL *s, WPACKET *pkt, unsigned int context, |
8521ced6 | 602 | X509 *x, size_t chainidx, int *al) |
224135e9 | 603 | { |
1266eefd MC |
604 | size_t i; |
605 | int addcustom = 0, min_version, max_version = 0, reason, tmpal; | |
d270de32 | 606 | const EXTENSION_DEFINITION *thisexd; |
224135e9 | 607 | |
7da160b0 | 608 | /* |
70af3d8e | 609 | * Normally if something goes wrong during construction it's an internal |
7da160b0 MC |
610 | * error. We can always override this later. |
611 | */ | |
70af3d8e | 612 | tmpal = SSL_AD_INTERNAL_ERROR; |
7da160b0 | 613 | |
224135e9 MC |
614 | if (!WPACKET_start_sub_packet_u16(pkt) |
615 | /* | |
616 | * If extensions are of zero length then we don't even add the | |
7da160b0 | 617 | * extensions length bytes to a ClientHello/ServerHello in SSLv3 |
224135e9 | 618 | */ |
7da160b0 MC |
619 | || ((context & (EXT_CLIENT_HELLO | EXT_TLS1_2_SERVER_HELLO)) != 0 |
620 | && s->version == SSL3_VERSION | |
224135e9 MC |
621 | && !WPACKET_set_flags(pkt, |
622 | WPACKET_FLAGS_ABANDON_ON_ZERO_LENGTH))) { | |
224135e9 | 623 | SSLerr(SSL_F_TLS_CONSTRUCT_EXTENSIONS, ERR_R_INTERNAL_ERROR); |
70af3d8e | 624 | goto err; |
224135e9 MC |
625 | } |
626 | ||
ab83e314 MC |
627 | if ((context & EXT_CLIENT_HELLO) != 0) { |
628 | reason = ssl_get_client_min_max_version(s, &min_version, &max_version); | |
629 | if (reason != 0) { | |
630 | SSLerr(SSL_F_TLS_CONSTRUCT_EXTENSIONS, reason); | |
70af3d8e | 631 | goto err; |
ab83e314 MC |
632 | } |
633 | } | |
634 | ||
635 | /* Add custom extensions first */ | |
636 | if ((context & EXT_CLIENT_HELLO) != 0) { | |
637 | custom_ext_init(&s->cert->cli_ext); | |
638 | addcustom = 1; | |
639 | } else if ((context & EXT_TLS1_2_SERVER_HELLO) != 0) { | |
640 | /* | |
641 | * We already initialised the custom extensions during ClientHello | |
642 | * parsing. | |
a1448c26 | 643 | * |
ab83e314 MC |
644 | * TODO(TLS1.3): We're going to need a new custom extension mechanism |
645 | * for TLS1.3, so that custom extensions can specify which of the | |
646 | * multiple message they wish to add themselves to. | |
647 | */ | |
648 | addcustom = 1; | |
649 | } | |
650 | ||
70af3d8e | 651 | if (addcustom && !custom_ext_add(s, s->server, pkt, &tmpal)) { |
ab83e314 | 652 | SSLerr(SSL_F_TLS_CONSTRUCT_EXTENSIONS, ERR_R_INTERNAL_ERROR); |
70af3d8e | 653 | goto err; |
ab83e314 MC |
654 | } |
655 | ||
1266eefd | 656 | for (i = 0, thisexd = ext_defs; i < OSSL_NELEM(ext_defs); i++, thisexd++) { |
61138358 MC |
657 | int (*construct)(SSL *s, WPACKET *pkt, unsigned int context, X509 *x, |
658 | size_t chainidx, int *al); | |
4b299b8e | 659 | |
224135e9 | 660 | /* Skip if not relevant for our context */ |
d270de32 | 661 | if ((thisexd->context & context) == 0) |
224135e9 MC |
662 | continue; |
663 | ||
1266eefd MC |
664 | construct = s->server ? thisexd->construct_stoc |
665 | : thisexd->construct_ctos; | |
224135e9 MC |
666 | |
667 | /* Check if this extension is defined for our protocol. If not, skip */ | |
668 | if ((SSL_IS_DTLS(s) | |
1266eefd | 669 | && (thisexd->context & EXT_TLS_IMPLEMENTATION_ONLY) |
4b299b8e | 670 | != 0) |
224135e9 | 671 | || (s->version == SSL3_VERSION |
1266eefd | 672 | && (thisexd->context & EXT_SSL3_ALLOWED) == 0) |
224135e9 | 673 | || (SSL_IS_TLS13(s) |
1266eefd | 674 | && (thisexd->context & EXT_TLS1_2_AND_BELOW_ONLY) |
4b299b8e | 675 | != 0) |
224135e9 | 676 | || (!SSL_IS_TLS13(s) |
1266eefd | 677 | && (thisexd->context & EXT_TLS1_3_ONLY) != 0 |
4b299b8e | 678 | && (context & EXT_CLIENT_HELLO) == 0) |
1266eefd | 679 | || ((thisexd->context & EXT_TLS1_3_ONLY) != 0 |
ab83e314 MC |
680 | && (context & EXT_CLIENT_HELLO) != 0 |
681 | && (SSL_IS_DTLS(s) || max_version < TLS1_3_VERSION)) | |
224135e9 MC |
682 | || construct == NULL) |
683 | continue; | |
684 | ||
61138358 | 685 | if (!construct(s, pkt, context, x, chainidx, &tmpal)) |
70af3d8e | 686 | goto err; |
224135e9 MC |
687 | } |
688 | ||
224135e9 | 689 | if (!WPACKET_close(pkt)) { |
224135e9 | 690 | SSLerr(SSL_F_TLS_CONSTRUCT_EXTENSIONS, ERR_R_INTERNAL_ERROR); |
70af3d8e | 691 | goto err; |
224135e9 MC |
692 | } |
693 | ||
694 | return 1; | |
70af3d8e MC |
695 | |
696 | err: | |
697 | *al = tmpal; | |
698 | return 0; | |
224135e9 | 699 | } |
805a2e9e | 700 | |
70af3d8e MC |
701 | /* |
702 | * Built in extension finalisation and initialisation functions. All initialise | |
703 | * or finalise the associated extension type for the given |context|. For | |
704 | * finalisers |sent| is set to 1 if we saw the extension during parsing, and 0 | |
705 | * otherwise. These functions return 1 on success or 0 on failure. In the event | |
706 | * of a failure then |*al| is populated with a suitable error code. | |
707 | */ | |
708 | ||
1266eefd | 709 | static int final_renegotiate(SSL *s, unsigned int context, int sent, |
805a2e9e MC |
710 | int *al) |
711 | { | |
332eb390 MC |
712 | if (!s->server) { |
713 | /* | |
714 | * Check if we can connect to a server that doesn't support safe | |
715 | * renegotiation | |
716 | */ | |
717 | if (!(s->options & SSL_OP_LEGACY_SERVER_CONNECT) | |
718 | && !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION) | |
719 | && !sent) { | |
720 | *al = SSL_AD_HANDSHAKE_FAILURE; | |
7fe97c07 | 721 | SSLerr(SSL_F_FINAL_RENEGOTIATE, |
332eb390 MC |
722 | SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED); |
723 | return 0; | |
724 | } | |
725 | ||
805a2e9e | 726 | return 1; |
332eb390 | 727 | } |
805a2e9e MC |
728 | |
729 | /* Need RI if renegotiating */ | |
730 | if (s->renegotiate | |
731 | && !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION) | |
732 | && !sent) { | |
733 | *al = SSL_AD_HANDSHAKE_FAILURE; | |
7fe97c07 | 734 | SSLerr(SSL_F_FINAL_RENEGOTIATE, |
805a2e9e MC |
735 | SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED); |
736 | return 0; | |
737 | } | |
738 | ||
332eb390 | 739 | |
805a2e9e MC |
740 | return 1; |
741 | } | |
742 | ||
1266eefd | 743 | static int init_server_name(SSL *s, unsigned int context) |
805a2e9e MC |
744 | { |
745 | if (s->server) | |
746 | s->servername_done = 0; | |
747 | ||
748 | return 1; | |
749 | } | |
750 | ||
1266eefd | 751 | static int final_server_name(SSL *s, unsigned int context, int sent, |
805a2e9e MC |
752 | int *al) |
753 | { | |
754 | int ret = SSL_TLSEXT_ERR_NOACK; | |
755 | int altmp = SSL_AD_UNRECOGNIZED_NAME; | |
756 | ||
aff8c126 RS |
757 | if (s->ctx != NULL && s->ctx->ext.servername_cb != 0) |
758 | ret = s->ctx->ext.servername_cb(s, &altmp, | |
759 | s->ctx->ext.servername_arg); | |
222da979 TS |
760 | else if (s->session_ctx != NULL |
761 | && s->session_ctx->ext.servername_cb != 0) | |
762 | ret = s->session_ctx->ext.servername_cb(s, &altmp, | |
763 | s->session_ctx->ext.servername_arg); | |
805a2e9e MC |
764 | |
765 | switch (ret) { | |
766 | case SSL_TLSEXT_ERR_ALERT_FATAL: | |
767 | *al = altmp; | |
768 | return 0; | |
769 | ||
770 | case SSL_TLSEXT_ERR_ALERT_WARNING: | |
771 | *al = altmp; | |
772 | return 1; | |
773 | ||
774 | case SSL_TLSEXT_ERR_NOACK: | |
775 | s->servername_done = 0; | |
776 | return 1; | |
777 | ||
778 | default: | |
779 | return 1; | |
780 | } | |
781 | } | |
782 | ||
332eb390 | 783 | #ifndef OPENSSL_NO_EC |
1266eefd | 784 | static int final_ec_pt_formats(SSL *s, unsigned int context, int sent, |
332eb390 MC |
785 | int *al) |
786 | { | |
787 | unsigned long alg_k, alg_a; | |
788 | ||
789 | if (s->server) | |
790 | return 1; | |
791 | ||
792 | alg_k = s->s3->tmp.new_cipher->algorithm_mkey; | |
793 | alg_a = s->s3->tmp.new_cipher->algorithm_auth; | |
794 | ||
795 | /* | |
796 | * If we are client and using an elliptic curve cryptography cipher | |
797 | * suite, then if server returns an EC point formats lists extension it | |
798 | * must contain uncompressed. | |
799 | */ | |
aff8c126 RS |
800 | if (s->ext.ecpointformats != NULL |
801 | && s->ext.ecpointformats_len > 0 | |
802 | && s->session->ext.ecpointformats != NULL | |
803 | && s->session->ext.ecpointformats_len > 0 | |
1266eefd | 804 | && ((alg_k & SSL_kECDHE) || (alg_a & SSL_aECDSA))) { |
332eb390 MC |
805 | /* we are using an ECC cipher */ |
806 | size_t i; | |
aff8c126 | 807 | unsigned char *list = s->session->ext.ecpointformats; |
1266eefd | 808 | |
aff8c126 | 809 | for (i = 0; i < s->session->ext.ecpointformats_len; i++) { |
1266eefd | 810 | if (*list++ == TLSEXT_ECPOINTFORMAT_uncompressed) |
332eb390 | 811 | break; |
332eb390 | 812 | } |
aff8c126 | 813 | if (i == s->session->ext.ecpointformats_len) { |
7fe97c07 | 814 | SSLerr(SSL_F_FINAL_EC_PT_FORMATS, |
332eb390 MC |
815 | SSL_R_TLS_INVALID_ECPOINTFORMAT_LIST); |
816 | return 0; | |
817 | } | |
818 | } | |
819 | ||
820 | return 1; | |
821 | } | |
822 | #endif | |
823 | ||
1266eefd | 824 | static int init_session_ticket(SSL *s, unsigned int context) |
332eb390 MC |
825 | { |
826 | if (!s->server) | |
aff8c126 | 827 | s->ext.ticket_expected = 0; |
332eb390 MC |
828 | |
829 | return 1; | |
830 | } | |
831 | ||
8f8c11d8 | 832 | #ifndef OPENSSL_NO_OCSP |
1266eefd | 833 | static int init_status_request(SSL *s, unsigned int context) |
805a2e9e | 834 | { |
f63e4288 | 835 | if (s->server) { |
aff8c126 | 836 | s->ext.status_type = TLSEXT_STATUSTYPE_nothing; |
f63e4288 MC |
837 | } else { |
838 | /* | |
839 | * Ensure we get sensible values passed to tlsext_status_cb in the event | |
840 | * that we don't receive a status message | |
841 | */ | |
8cbfcc70 RS |
842 | OPENSSL_free(s->ext.ocsp.resp); |
843 | s->ext.ocsp.resp = NULL; | |
844 | s->ext.ocsp.resp_len = 0; | |
f63e4288 | 845 | } |
332eb390 MC |
846 | |
847 | return 1; | |
848 | } | |
8f8c11d8 | 849 | #endif |
332eb390 | 850 | |
805a2e9e | 851 | #ifndef OPENSSL_NO_NEXTPROTONEG |
1266eefd | 852 | static int init_npn(SSL *s, unsigned int context) |
805a2e9e | 853 | { |
aff8c126 | 854 | s->s3->npn_seen = 0; |
805a2e9e MC |
855 | |
856 | return 1; | |
857 | } | |
858 | #endif | |
859 | ||
1266eefd | 860 | static int init_alpn(SSL *s, unsigned int context) |
805a2e9e | 861 | { |
332eb390 MC |
862 | OPENSSL_free(s->s3->alpn_selected); |
863 | s->s3->alpn_selected = NULL; | |
805a2e9e | 864 | if (s->server) { |
805a2e9e MC |
865 | s->s3->alpn_selected_len = 0; |
866 | OPENSSL_free(s->s3->alpn_proposed); | |
867 | s->s3->alpn_proposed = NULL; | |
868 | s->s3->alpn_proposed_len = 0; | |
869 | } | |
805a2e9e MC |
870 | return 1; |
871 | } | |
872 | ||
1266eefd | 873 | static int final_alpn(SSL *s, unsigned int context, int sent, int *al) |
02f0274e MC |
874 | { |
875 | const unsigned char *selected = NULL; | |
876 | unsigned char selected_len = 0; | |
877 | ||
878 | if (!s->server) | |
879 | return 1; | |
880 | ||
aff8c126 RS |
881 | if (s->ctx->ext.alpn_select_cb != NULL && s->s3->alpn_proposed != NULL) { |
882 | int r = s->ctx->ext.alpn_select_cb(s, &selected, &selected_len, | |
883 | s->s3->alpn_proposed, | |
884 | (unsigned int)s->s3->alpn_proposed_len, | |
885 | s->ctx->ext.alpn_select_cb_arg); | |
02f0274e MC |
886 | |
887 | if (r == SSL_TLSEXT_ERR_OK) { | |
888 | OPENSSL_free(s->s3->alpn_selected); | |
889 | s->s3->alpn_selected = OPENSSL_memdup(selected, selected_len); | |
890 | if (s->s3->alpn_selected == NULL) { | |
891 | *al = SSL_AD_INTERNAL_ERROR; | |
892 | return 0; | |
893 | } | |
894 | s->s3->alpn_selected_len = selected_len; | |
895 | #ifndef OPENSSL_NO_NEXTPROTONEG | |
896 | /* ALPN takes precedence over NPN. */ | |
aff8c126 | 897 | s->s3->npn_seen = 0; |
02f0274e MC |
898 | #endif |
899 | } else { | |
900 | *al = SSL_AD_NO_APPLICATION_PROTOCOL; | |
901 | return 0; | |
902 | } | |
903 | } | |
904 | ||
905 | return 1; | |
906 | } | |
907 | ||
1266eefd | 908 | static int init_sig_algs(SSL *s, unsigned int context) |
805a2e9e MC |
909 | { |
910 | /* Clear any signature algorithms extension received */ | |
911 | OPENSSL_free(s->s3->tmp.peer_sigalgs); | |
912 | s->s3->tmp.peer_sigalgs = NULL; | |
913 | ||
914 | return 1; | |
915 | } | |
916 | ||
917 | #ifndef OPENSSL_NO_SRP | |
1266eefd | 918 | static int init_srp(SSL *s, unsigned int context) |
805a2e9e MC |
919 | { |
920 | OPENSSL_free(s->srp_ctx.login); | |
921 | s->srp_ctx.login = NULL; | |
922 | ||
923 | return 1; | |
924 | } | |
925 | #endif | |
926 | ||
1266eefd | 927 | static int init_etm(SSL *s, unsigned int context) |
805a2e9e | 928 | { |
28a31a0a | 929 | s->ext.use_etm = 0; |
332eb390 MC |
930 | |
931 | return 1; | |
932 | } | |
933 | ||
1266eefd | 934 | static int init_ems(SSL *s, unsigned int context) |
332eb390 MC |
935 | { |
936 | if (!s->server) | |
937 | s->s3->flags &= ~TLS1_FLAGS_RECEIVED_EXTMS; | |
938 | ||
939 | return 1; | |
940 | } | |
941 | ||
1266eefd | 942 | static int final_ems(SSL *s, unsigned int context, int sent, int *al) |
332eb390 MC |
943 | { |
944 | if (!s->server && s->hit) { | |
945 | /* | |
946 | * Check extended master secret extension is consistent with | |
947 | * original session. | |
948 | */ | |
949 | if (!(s->s3->flags & TLS1_FLAGS_RECEIVED_EXTMS) != | |
950 | !(s->session->flags & SSL_SESS_FLAG_EXTMS)) { | |
951 | *al = SSL_AD_HANDSHAKE_FAILURE; | |
7fe97c07 | 952 | SSLerr(SSL_F_FINAL_EMS, SSL_R_INCONSISTENT_EXTMS); |
332eb390 MC |
953 | return 0; |
954 | } | |
955 | } | |
805a2e9e MC |
956 | |
957 | return 1; | |
958 | } | |
959 | ||
960 | #ifndef OPENSSL_NO_SRTP | |
1266eefd | 961 | static int init_srtp(SSL *s, unsigned int context) |
805a2e9e MC |
962 | { |
963 | if (s->server) | |
964 | s->srtp_profile = NULL; | |
965 | ||
966 | return 1; | |
967 | } | |
968 | #endif | |
04904312 MC |
969 | |
970 | static int final_sig_algs(SSL *s, unsigned int context, int sent, int *al) | |
971 | { | |
972 | if (!sent && SSL_IS_TLS13(s)) { | |
973 | *al = TLS13_AD_MISSING_EXTENSION; | |
974 | SSLerr(SSL_F_FINAL_SIG_ALGS, SSL_R_MISSING_SIGALGS_EXTENSION); | |
975 | return 0; | |
976 | } | |
977 | ||
978 | return 1; | |
979 | } | |
b2f7e8c0 | 980 | |
deb2d5e7 | 981 | #ifndef OPENSSL_NO_EC |
f4bbb37c MC |
982 | static int final_key_share(SSL *s, unsigned int context, int sent, int *al) |
983 | { | |
984 | if (!SSL_IS_TLS13(s)) | |
985 | return 1; | |
986 | ||
987 | /* | |
988 | * If | |
aff9929b MC |
989 | * we are a client |
990 | * AND | |
f4bbb37c MC |
991 | * we have no key_share |
992 | * AND | |
993 | * (we are not resuming | |
994 | * OR the kex_mode doesn't allow non key_share resumes) | |
995 | * THEN | |
aff9929b | 996 | * fail; |
f4bbb37c | 997 | */ |
aff9929b MC |
998 | if (!s->server |
999 | && !sent | |
f4bbb37c MC |
1000 | && (!s->hit |
1001 | || (s->ext.psk_kex_mode & TLSEXT_KEX_MODE_FLAG_KE) == 0)) { | |
7d061fce | 1002 | /* Nothing left we can do - just fail */ |
f4bbb37c MC |
1003 | *al = SSL_AD_HANDSHAKE_FAILURE; |
1004 | SSLerr(SSL_F_FINAL_KEY_SHARE, SSL_R_NO_SUITABLE_KEY_SHARE); | |
1005 | return 0; | |
1006 | } | |
aff9929b MC |
1007 | /* |
1008 | * If | |
1009 | * we are a server | |
1010 | * AND | |
1011 | * we have no key_share | |
1012 | * THEN | |
1013 | * If | |
1014 | * we didn't already send a HelloRetryRequest | |
1015 | * AND | |
1016 | * the client sent a key_share extension | |
1017 | * AND | |
1018 | * (we are not resuming | |
1019 | * OR the kex_mode allows key_share resumes) | |
1020 | * AND | |
1021 | * a shared group exists | |
1022 | * THEN | |
1023 | * send a HelloRetryRequest | |
1024 | * ELSE If | |
1025 | * we are not resuming | |
1026 | * OR | |
1027 | * the kex_mode doesn't allow non key_share resumes | |
1028 | * THEN | |
1029 | * fail; | |
1030 | */ | |
1031 | if (s->server && s->s3->peer_tmp == NULL) { | |
1032 | /* No suitable share */ | |
1033 | if (s->hello_retry_request == 0 && sent | |
1034 | && (!s->hit | |
1035 | || (s->ext.psk_kex_mode & TLSEXT_KEX_MODE_FLAG_KE_DHE) | |
1036 | != 0)) { | |
1037 | const unsigned char *pcurves, *pcurvestmp, *clntcurves; | |
1038 | size_t num_curves, clnt_num_curves, i; | |
319a33d0 | 1039 | unsigned int group_id = 0; |
aff9929b | 1040 | |
2248dbeb | 1041 | /* Check if a shared group exists */ |
aff9929b MC |
1042 | |
1043 | /* Get the clients list of supported groups. */ | |
1044 | if (!tls1_get_curvelist(s, 1, &clntcurves, &clnt_num_curves)) { | |
1045 | *al = SSL_AD_INTERNAL_ERROR; | |
1046 | SSLerr(SSL_F_FINAL_KEY_SHARE, ERR_R_INTERNAL_ERROR); | |
1047 | return 0; | |
1048 | } | |
1049 | ||
1050 | /* Get our list of available groups */ | |
1051 | if (!tls1_get_curvelist(s, 0, &pcurves, &num_curves)) { | |
1052 | *al = SSL_AD_INTERNAL_ERROR; | |
1053 | SSLerr(SSL_F_FINAL_KEY_SHARE, ERR_R_INTERNAL_ERROR); | |
1054 | return 0; | |
1055 | } | |
1056 | ||
1057 | /* Find the first group we allow that is also in client's list */ | |
1058 | for (i = 0, pcurvestmp = pcurves; i < num_curves; | |
1059 | i++, pcurvestmp += 2) { | |
0dd7ba24 | 1060 | group_id = bytestogroup(pcurvestmp); |
aff9929b MC |
1061 | |
1062 | if (check_in_list(s, group_id, clntcurves, clnt_num_curves, 1)) | |
1063 | break; | |
1064 | } | |
1065 | ||
1066 | if (i < num_curves) { | |
1067 | /* A shared group exists so send a HelloRetryRequest */ | |
1068 | s->s3->group_id = group_id; | |
1069 | s->hello_retry_request = 1; | |
1070 | return 1; | |
1071 | } | |
1072 | } | |
1073 | if (!s->hit | |
1074 | || (s->ext.psk_kex_mode & TLSEXT_KEX_MODE_FLAG_KE) == 0) { | |
1075 | /* Nothing left we can do - just fail */ | |
1076 | *al = SSL_AD_HANDSHAKE_FAILURE; | |
1077 | SSLerr(SSL_F_FINAL_KEY_SHARE, SSL_R_NO_SUITABLE_KEY_SHARE); | |
1078 | return 0; | |
1079 | } | |
1080 | } | |
1081 | ||
1082 | /* We have a key_share so don't send any more HelloRetryRequest messages */ | |
1083 | if (s->server) | |
1084 | s->hello_retry_request = 0; | |
f4bbb37c MC |
1085 | |
1086 | /* | |
1087 | * For a client side resumption with no key_share we need to generate | |
1088 | * the handshake secret (otherwise this is done during key_share | |
1089 | * processing). | |
1090 | */ | |
1091 | if (!sent && !s->server && !tls13_generate_handshake_secret(s, NULL, 0)) { | |
1092 | *al = SSL_AD_INTERNAL_ERROR; | |
1093 | SSLerr(SSL_F_FINAL_KEY_SHARE, ERR_R_INTERNAL_ERROR); | |
1094 | return 0; | |
1095 | } | |
1096 | ||
1097 | return 1; | |
1098 | } | |
deb2d5e7 | 1099 | #endif |
f4bbb37c | 1100 | |
b2f7e8c0 MC |
1101 | static int init_psk_kex_modes(SSL *s, unsigned int context) |
1102 | { | |
1103 | s->ext.psk_kex_mode = TLSEXT_KEX_MODE_FLAG_NONE; | |
b2f7e8c0 MC |
1104 | return 1; |
1105 | } | |
1053a6e2 MC |
1106 | |
1107 | int tls_psk_do_binder(SSL *s, const EVP_MD *md, const unsigned char *msgstart, | |
1108 | size_t binderoffset, const unsigned char *binderin, | |
1109 | unsigned char *binderout, | |
1110 | SSL_SESSION *sess, int sign) | |
1111 | { | |
1112 | EVP_PKEY *mackey = NULL; | |
1113 | EVP_MD_CTX *mctx = NULL; | |
1114 | unsigned char hash[EVP_MAX_MD_SIZE], binderkey[EVP_MAX_MD_SIZE]; | |
1115 | unsigned char finishedkey[EVP_MAX_MD_SIZE], tmpbinder[EVP_MAX_MD_SIZE]; | |
1116 | const char resumption_label[] = "resumption psk binder key"; | |
1f5b44e9 | 1117 | size_t bindersize, hashsize = EVP_MD_size(md); |
1053a6e2 MC |
1118 | int ret = -1; |
1119 | ||
1120 | /* Generate the early_secret */ | |
1121 | if (!tls13_generate_secret(s, md, NULL, sess->master_key, | |
1122 | sess->master_key_length, | |
1123 | (unsigned char *)&s->early_secret)) { | |
1124 | SSLerr(SSL_F_TLS_PSK_DO_BINDER, ERR_R_INTERNAL_ERROR); | |
1125 | goto err; | |
1126 | } | |
1127 | ||
1128 | /* | |
1129 | * Create the handshake hash for the binder key...the messages so far are | |
1130 | * empty! | |
1131 | */ | |
1132 | mctx = EVP_MD_CTX_new(); | |
1133 | if (mctx == NULL | |
1134 | || EVP_DigestInit_ex(mctx, md, NULL) <= 0 | |
1135 | || EVP_DigestFinal_ex(mctx, hash, NULL) <= 0) { | |
1136 | SSLerr(SSL_F_TLS_PSK_DO_BINDER, ERR_R_INTERNAL_ERROR); | |
1137 | goto err; | |
1138 | } | |
1139 | ||
1140 | /* Generate the binder key */ | |
1141 | if (!tls13_hkdf_expand(s, md, s->early_secret, | |
1142 | (unsigned char *)resumption_label, | |
1143 | sizeof(resumption_label) - 1, hash, binderkey, | |
1144 | hashsize)) { | |
1145 | SSLerr(SSL_F_TLS_PSK_DO_BINDER, ERR_R_INTERNAL_ERROR); | |
1146 | goto err; | |
1147 | } | |
1148 | ||
1149 | /* Generate the finished key */ | |
1150 | if (!tls13_derive_finishedkey(s, md, binderkey, finishedkey, hashsize)) { | |
1151 | SSLerr(SSL_F_TLS_PSK_DO_BINDER, ERR_R_INTERNAL_ERROR); | |
1152 | goto err; | |
1153 | } | |
1154 | ||
aff9929b MC |
1155 | if (EVP_DigestInit_ex(mctx, md, NULL) <= 0) { |
1156 | SSLerr(SSL_F_TLS_PSK_DO_BINDER, ERR_R_INTERNAL_ERROR); | |
1157 | goto err; | |
1158 | } | |
1159 | ||
1053a6e2 | 1160 | /* |
aff9929b MC |
1161 | * Get a hash of the ClientHello up to the start of the binders. If we are |
1162 | * following a HelloRetryRequest then this includes the hash of the first | |
1163 | * ClientHello and the HelloRetryRequest itself. | |
1053a6e2 | 1164 | */ |
aff9929b MC |
1165 | if (s->hello_retry_request) { |
1166 | size_t hdatalen; | |
1167 | void *hdata; | |
1168 | ||
1169 | hdatalen = BIO_get_mem_data(s->s3->handshake_buffer, &hdata); | |
1170 | if (hdatalen <= 0) { | |
1171 | SSLerr(SSL_F_TLS_PSK_DO_BINDER, SSL_R_BAD_HANDSHAKE_LENGTH); | |
1172 | goto err; | |
1173 | } | |
1174 | ||
1175 | /* | |
1176 | * For servers the handshake buffer data will include the second | |
1177 | * ClientHello - which we don't want - so we need to take that bit off. | |
1178 | */ | |
1179 | if (s->server) { | |
1180 | if (hdatalen < s->init_num + SSL3_HM_HEADER_LENGTH) { | |
1181 | SSLerr(SSL_F_TLS_PSK_DO_BINDER, ERR_R_INTERNAL_ERROR); | |
1182 | goto err; | |
1183 | } | |
1184 | hdatalen -= s->init_num + SSL3_HM_HEADER_LENGTH; | |
1185 | } | |
1186 | ||
1187 | if (EVP_DigestUpdate(mctx, hdata, hdatalen) <= 0) { | |
1188 | SSLerr(SSL_F_TLS_PSK_DO_BINDER, ERR_R_INTERNAL_ERROR); | |
1189 | goto err; | |
1190 | } | |
1191 | } | |
1192 | ||
1193 | if (EVP_DigestUpdate(mctx, msgstart, binderoffset) <= 0 | |
1053a6e2 MC |
1194 | || EVP_DigestFinal_ex(mctx, hash, NULL) <= 0) { |
1195 | SSLerr(SSL_F_TLS_PSK_DO_BINDER, ERR_R_INTERNAL_ERROR); | |
1196 | goto err; | |
1197 | } | |
1198 | ||
1199 | mackey = EVP_PKEY_new_mac_key(EVP_PKEY_HMAC, NULL, finishedkey, hashsize); | |
1200 | if (mackey == NULL) { | |
1201 | SSLerr(SSL_F_TLS_PSK_DO_BINDER, ERR_R_INTERNAL_ERROR); | |
1202 | goto err; | |
1203 | } | |
1204 | ||
1205 | if (!sign) | |
1206 | binderout = tmpbinder; | |
1207 | ||
1208 | bindersize = hashsize; | |
1209 | if (EVP_DigestSignInit(mctx, NULL, md, NULL, mackey) <= 0 | |
1210 | || EVP_DigestSignUpdate(mctx, hash, hashsize) <= 0 | |
1211 | || EVP_DigestSignFinal(mctx, binderout, &bindersize) <= 0 | |
1212 | || bindersize != hashsize) { | |
1213 | SSLerr(SSL_F_TLS_PSK_DO_BINDER, ERR_R_INTERNAL_ERROR); | |
1214 | goto err; | |
1215 | } | |
1216 | ||
1217 | if (sign) { | |
1218 | ret = 1; | |
1219 | } else { | |
1220 | /* HMAC keys can't do EVP_DigestVerify* - use CRYPTO_memcmp instead */ | |
1221 | ret = (CRYPTO_memcmp(binderin, binderout, hashsize) == 0); | |
1222 | } | |
1223 | ||
1224 | err: | |
1225 | OPENSSL_cleanse(binderkey, sizeof(binderkey)); | |
1226 | OPENSSL_cleanse(finishedkey, sizeof(finishedkey)); | |
1227 | EVP_PKEY_free(mackey); | |
1228 | EVP_MD_CTX_free(mctx); | |
1229 | ||
1230 | return ret; | |
1231 | } |