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6b473aca | 1 | /* |
fecb3aae | 2 | * Copyright 2016-2022 The OpenSSL Project Authors. All Rights Reserved. |
6b473aca | 3 | * |
2c18d164 | 4 | * Licensed under the Apache License 2.0 (the "License"). You may not use |
6b473aca MC |
5 | * this file except in compliance with the License. You can obtain a copy |
6 | * in the file LICENSE in the source distribution or at | |
7 | * https://www.openssl.org/source/license.html | |
8 | */ | |
9 | ||
650c6687 RB |
10 | #if defined(__TANDEM) && defined(_SPT_MODEL_) |
11 | # include <spthread.h> | |
12 | # include <spt_extensions.h> /* timeval */ | |
13 | #endif | |
14 | ||
f6370040 | 15 | #include <string.h> |
677963e5 | 16 | #include "internal/nelem.h" |
88050dd1 | 17 | #include "internal/cryptlib.h" |
706457b7 DMSP |
18 | #include "../ssl_local.h" |
19 | #include "statem_local.h" | |
6b473aca | 20 | |
38b051a1 TM |
21 | static int final_renegotiate(SSL_CONNECTION *s, unsigned int context, int sent); |
22 | static int init_server_name(SSL_CONNECTION *s, unsigned int context); | |
23 | static int final_server_name(SSL_CONNECTION *s, unsigned int context, int sent); | |
24 | static int final_ec_pt_formats(SSL_CONNECTION *s, unsigned int context, | |
25 | int sent); | |
26 | static int init_session_ticket(SSL_CONNECTION *s, unsigned int context); | |
8f8c11d8 | 27 | #ifndef OPENSSL_NO_OCSP |
38b051a1 | 28 | static int init_status_request(SSL_CONNECTION *s, unsigned int context); |
8f8c11d8 | 29 | #endif |
805a2e9e | 30 | #ifndef OPENSSL_NO_NEXTPROTONEG |
38b051a1 | 31 | static int init_npn(SSL_CONNECTION *s, unsigned int context); |
805a2e9e | 32 | #endif |
38b051a1 TM |
33 | static int init_alpn(SSL_CONNECTION *s, unsigned int context); |
34 | static int final_alpn(SSL_CONNECTION *s, unsigned int context, int sent); | |
35 | static int init_sig_algs_cert(SSL_CONNECTION *s, unsigned int context); | |
36 | static int init_sig_algs(SSL_CONNECTION *s, unsigned int context); | |
37 | static int init_certificate_authorities(SSL_CONNECTION *s, | |
38 | unsigned int context); | |
39 | static EXT_RETURN tls_construct_certificate_authorities(SSL_CONNECTION *s, | |
40 | WPACKET *pkt, | |
b186a592 MC |
41 | unsigned int context, |
42 | X509 *x, | |
f63a17d6 | 43 | size_t chainidx); |
38b051a1 | 44 | static int tls_parse_certificate_authorities(SSL_CONNECTION *s, PACKET *pkt, |
45615c5f | 45 | unsigned int context, X509 *x, |
f63a17d6 | 46 | size_t chainidx); |
805a2e9e | 47 | #ifndef OPENSSL_NO_SRP |
38b051a1 | 48 | static int init_srp(SSL_CONNECTION *s, unsigned int context); |
805a2e9e | 49 | #endif |
38b051a1 TM |
50 | static int init_ec_point_formats(SSL_CONNECTION *s, unsigned int context); |
51 | static int init_etm(SSL_CONNECTION *s, unsigned int context); | |
52 | static int init_ems(SSL_CONNECTION *s, unsigned int context); | |
53 | static int final_ems(SSL_CONNECTION *s, unsigned int context, int sent); | |
54 | static int init_psk_kex_modes(SSL_CONNECTION *s, unsigned int context); | |
55 | static int final_key_share(SSL_CONNECTION *s, unsigned int context, int sent); | |
805a2e9e | 56 | #ifndef OPENSSL_NO_SRTP |
38b051a1 | 57 | static int init_srtp(SSL_CONNECTION *s, unsigned int context); |
805a2e9e | 58 | #endif |
38b051a1 TM |
59 | static int final_sig_algs(SSL_CONNECTION *s, unsigned int context, int sent); |
60 | static int final_early_data(SSL_CONNECTION *s, unsigned int context, int sent); | |
61 | static int final_maxfragmentlen(SSL_CONNECTION *s, unsigned int context, | |
62 | int sent); | |
63 | static int init_post_handshake_auth(SSL_CONNECTION *s, unsigned int context); | |
64 | static int final_psk(SSL_CONNECTION *s, unsigned int context, int sent); | |
b67cb09f TS |
65 | static int tls_init_compress_certificate(SSL_CONNECTION *sc, unsigned int context); |
66 | static EXT_RETURN tls_construct_compress_certificate(SSL_CONNECTION *sc, WPACKET *pkt, | |
67 | unsigned int context, | |
68 | X509 *x, size_t chainidx); | |
69 | static int tls_parse_compress_certificate(SSL_CONNECTION *sc, PACKET *pkt, | |
70 | unsigned int context, | |
71 | X509 *x, size_t chainidx); | |
9d75dce3 | 72 | |
70af3d8e | 73 | /* Structure to define a built-in extension */ |
1266eefd MC |
74 | typedef struct extensions_definition_st { |
75 | /* The defined type for the extension */ | |
6b473aca | 76 | unsigned int type; |
1266eefd MC |
77 | /* |
78 | * The context that this extension applies to, e.g. what messages and | |
79 | * protocol versions | |
80 | */ | |
81 | unsigned int context; | |
68db4dda | 82 | /* |
805a2e9e MC |
83 | * Initialise extension before parsing. Always called for relevant contexts |
84 | * even if extension not present | |
68db4dda | 85 | */ |
38b051a1 | 86 | int (*init)(SSL_CONNECTION *s, unsigned int context); |
1266eefd | 87 | /* Parse extension sent from client to server */ |
38b051a1 TM |
88 | int (*parse_ctos)(SSL_CONNECTION *s, PACKET *pkt, unsigned int context, |
89 | X509 *x, size_t chainidx); | |
1266eefd | 90 | /* Parse extension send from server to client */ |
38b051a1 TM |
91 | int (*parse_stoc)(SSL_CONNECTION *s, PACKET *pkt, unsigned int context, |
92 | X509 *x, size_t chainidx); | |
1266eefd | 93 | /* Construct extension sent from server to client */ |
38b051a1 TM |
94 | EXT_RETURN (*construct_stoc)(SSL_CONNECTION *s, WPACKET *pkt, |
95 | unsigned int context, | |
f63a17d6 | 96 | X509 *x, size_t chainidx); |
1266eefd | 97 | /* Construct extension sent from client to server */ |
38b051a1 TM |
98 | EXT_RETURN (*construct_ctos)(SSL_CONNECTION *s, WPACKET *pkt, |
99 | unsigned int context, | |
f63a17d6 | 100 | X509 *x, size_t chainidx); |
68db4dda | 101 | /* |
805a2e9e MC |
102 | * Finalise extension after parsing. Always called where an extensions was |
103 | * initialised even if the extension was not present. |sent| is set to 1 if | |
104 | * the extension was seen, or 0 otherwise. | |
68db4dda | 105 | */ |
38b051a1 | 106 | int (*final)(SSL_CONNECTION *s, unsigned int context, int sent); |
6b473aca MC |
107 | } EXTENSION_DEFINITION; |
108 | ||
4b299b8e | 109 | /* |
70af3d8e | 110 | * Definitions of all built-in extensions. NOTE: Changes in the number or order |
bd91e3c8 | 111 | * of these extensions should be mirrored with equivalent changes to the |
706457b7 | 112 | * indexes ( TLSEXT_IDX_* ) defined in ssl_local.h. |
ac44deaf TS |
113 | * Extensions should be added to test/ext_internal_test.c as well, as that |
114 | * tests the ordering of the extensions. | |
115 | * | |
70af3d8e MC |
116 | * Each extension has an initialiser, a client and |
117 | * server side parser and a finaliser. The initialiser is called (if the | |
118 | * extension is relevant to the given context) even if we did not see the | |
119 | * extension in the message that we received. The parser functions are only | |
120 | * called if we see the extension in the message. The finalisers are always | |
121 | * called if the initialiser was called. | |
122 | * There are also server and client side constructor functions which are always | |
123 | * called during message construction if the extension is relevant for the | |
124 | * given context. | |
125 | * The initialisation, parsing, finalisation and construction functions are | |
126 | * always called in the order defined in this list. Some extensions may depend | |
127 | * on others having been processed first, so the order of this list is | |
128 | * significant. | |
129 | * The extension context is defined by a series of flags which specify which | |
130 | * messages the extension is relevant to. These flags also specify whether the | |
3e6c1da8 | 131 | * extension is relevant to a particular protocol or protocol version. |
a1448c26 | 132 | * |
10ed1b72 TS |
133 | * NOTE: WebSphere Application Server 7+ cannot handle empty extensions at |
134 | * the end, keep these extensions before signature_algorithm. | |
4b299b8e | 135 | */ |
ac44deaf | 136 | #define INVALID_EXTENSION { TLSEXT_TYPE_invalid, 0, NULL, NULL, NULL, NULL, NULL, NULL } |
6b473aca MC |
137 | static const EXTENSION_DEFINITION ext_defs[] = { |
138 | { | |
139 | TLSEXT_TYPE_renegotiate, | |
fe874d27 MC |
140 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO |
141 | | SSL_EXT_SSL3_ALLOWED | SSL_EXT_TLS1_2_AND_BELOW_ONLY, | |
1266eefd MC |
142 | NULL, tls_parse_ctos_renegotiate, tls_parse_stoc_renegotiate, |
143 | tls_construct_stoc_renegotiate, tls_construct_ctos_renegotiate, | |
144 | final_renegotiate | |
6b473aca MC |
145 | }, |
146 | { | |
147 | TLSEXT_TYPE_server_name, | |
fe874d27 MC |
148 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO |
149 | | SSL_EXT_TLS1_3_ENCRYPTED_EXTENSIONS, | |
1266eefd MC |
150 | init_server_name, |
151 | tls_parse_ctos_server_name, tls_parse_stoc_server_name, | |
152 | tls_construct_stoc_server_name, tls_construct_ctos_server_name, | |
153 | final_server_name | |
6b473aca | 154 | }, |
cf72c757 F |
155 | { |
156 | TLSEXT_TYPE_max_fragment_length, | |
157 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO | |
158 | | SSL_EXT_TLS1_3_ENCRYPTED_EXTENSIONS, | |
159 | NULL, tls_parse_ctos_maxfragmentlen, tls_parse_stoc_maxfragmentlen, | |
160 | tls_construct_stoc_maxfragmentlen, tls_construct_ctos_maxfragmentlen, | |
161 | final_maxfragmentlen | |
162 | }, | |
6b473aca MC |
163 | #ifndef OPENSSL_NO_SRP |
164 | { | |
165 | TLSEXT_TYPE_srp, | |
fe874d27 | 166 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_AND_BELOW_ONLY, |
1266eefd | 167 | init_srp, tls_parse_ctos_srp, NULL, NULL, tls_construct_ctos_srp, NULL |
6b473aca | 168 | }, |
0785274c MC |
169 | #else |
170 | INVALID_EXTENSION, | |
6b473aca | 171 | #endif |
6b473aca MC |
172 | { |
173 | TLSEXT_TYPE_ec_point_formats, | |
fe874d27 MC |
174 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO |
175 | | SSL_EXT_TLS1_2_AND_BELOW_ONLY, | |
3f987381 | 176 | init_ec_point_formats, tls_parse_ctos_ec_pt_formats, tls_parse_stoc_ec_pt_formats, |
1266eefd MC |
177 | tls_construct_stoc_ec_pt_formats, tls_construct_ctos_ec_pt_formats, |
178 | final_ec_pt_formats | |
6b473aca MC |
179 | }, |
180 | { | |
7bc2bddb BK |
181 | /* |
182 | * "supported_groups" is spread across several specifications. | |
183 | * It was originally specified as "elliptic_curves" in RFC 4492, | |
184 | * and broadened to include named FFDH groups by RFC 7919. | |
185 | * Both RFCs 4492 and 7919 do not include a provision for the server | |
186 | * to indicate to the client the complete list of groups supported | |
187 | * by the server, with the server instead just indicating the | |
188 | * selected group for this connection in the ServerKeyExchange | |
189 | * message. TLS 1.3 adds a scheme for the server to indicate | |
190 | * to the client its list of supported groups in the | |
191 | * EncryptedExtensions message, but none of the relevant | |
192 | * specifications permit sending supported_groups in the ServerHello. | |
193 | * Nonetheless (possibly due to the close proximity to the | |
194 | * "ec_point_formats" extension, which is allowed in the ServerHello), | |
195 | * there are several servers that send this extension in the | |
196 | * ServerHello anyway. Up to and including the 1.1.0 release, | |
197 | * we did not check for the presence of nonpermitted extensions, | |
198 | * so to avoid a regression, we must permit this extension in the | |
199 | * TLS 1.2 ServerHello as well. | |
200 | * | |
201 | * Note that there is no tls_parse_stoc_supported_groups function, | |
202 | * so we do not perform any additional parsing, validation, or | |
203 | * processing on the server's group list -- this is just a minimal | |
204 | * change to preserve compatibility with these misbehaving servers. | |
205 | */ | |
6b473aca | 206 | TLSEXT_TYPE_supported_groups, |
7bc2bddb BK |
207 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_3_ENCRYPTED_EXTENSIONS |
208 | | SSL_EXT_TLS1_2_SERVER_HELLO, | |
1266eefd | 209 | NULL, tls_parse_ctos_supported_groups, NULL, |
6af87546 | 210 | tls_construct_stoc_supported_groups, |
1266eefd | 211 | tls_construct_ctos_supported_groups, NULL |
6b473aca | 212 | }, |
6b473aca MC |
213 | { |
214 | TLSEXT_TYPE_session_ticket, | |
fe874d27 MC |
215 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO |
216 | | SSL_EXT_TLS1_2_AND_BELOW_ONLY, | |
1266eefd MC |
217 | init_session_ticket, tls_parse_ctos_session_ticket, |
218 | tls_parse_stoc_session_ticket, tls_construct_stoc_session_ticket, | |
219 | tls_construct_ctos_session_ticket, NULL | |
6b473aca | 220 | }, |
ab83e314 | 221 | #ifndef OPENSSL_NO_OCSP |
6b473aca MC |
222 | { |
223 | TLSEXT_TYPE_status_request, | |
fe874d27 | 224 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO |
5de683d2 | 225 | | SSL_EXT_TLS1_3_CERTIFICATE | SSL_EXT_TLS1_3_CERTIFICATE_REQUEST, |
1266eefd MC |
226 | init_status_request, tls_parse_ctos_status_request, |
227 | tls_parse_stoc_status_request, tls_construct_stoc_status_request, | |
f63e4288 | 228 | tls_construct_ctos_status_request, NULL |
6b473aca | 229 | }, |
0785274c MC |
230 | #else |
231 | INVALID_EXTENSION, | |
ab83e314 | 232 | #endif |
6b473aca MC |
233 | #ifndef OPENSSL_NO_NEXTPROTONEG |
234 | { | |
235 | TLSEXT_TYPE_next_proto_neg, | |
fe874d27 MC |
236 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO |
237 | | SSL_EXT_TLS1_2_AND_BELOW_ONLY, | |
1266eefd MC |
238 | init_npn, tls_parse_ctos_npn, tls_parse_stoc_npn, |
239 | tls_construct_stoc_next_proto_neg, tls_construct_ctos_npn, NULL | |
6b473aca | 240 | }, |
0785274c MC |
241 | #else |
242 | INVALID_EXTENSION, | |
6b473aca MC |
243 | #endif |
244 | { | |
02f0274e MC |
245 | /* |
246 | * Must appear in this list after server_name so that finalisation | |
247 | * happens after server_name callbacks | |
248 | */ | |
6b473aca | 249 | TLSEXT_TYPE_application_layer_protocol_negotiation, |
fe874d27 MC |
250 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO |
251 | | SSL_EXT_TLS1_3_ENCRYPTED_EXTENSIONS, | |
1266eefd | 252 | init_alpn, tls_parse_ctos_alpn, tls_parse_stoc_alpn, |
630369d9 | 253 | tls_construct_stoc_alpn, tls_construct_ctos_alpn, final_alpn |
6b473aca | 254 | }, |
7da160b0 | 255 | #ifndef OPENSSL_NO_SRTP |
6b473aca MC |
256 | { |
257 | TLSEXT_TYPE_use_srtp, | |
fe874d27 MC |
258 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO |
259 | | SSL_EXT_TLS1_3_ENCRYPTED_EXTENSIONS | SSL_EXT_DTLS_ONLY, | |
1266eefd MC |
260 | init_srtp, tls_parse_ctos_use_srtp, tls_parse_stoc_use_srtp, |
261 | tls_construct_stoc_use_srtp, tls_construct_ctos_use_srtp, NULL | |
6b473aca | 262 | }, |
0785274c MC |
263 | #else |
264 | INVALID_EXTENSION, | |
7da160b0 | 265 | #endif |
6b473aca MC |
266 | { |
267 | TLSEXT_TYPE_encrypt_then_mac, | |
fe874d27 MC |
268 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO |
269 | | SSL_EXT_TLS1_2_AND_BELOW_ONLY, | |
1266eefd MC |
270 | init_etm, tls_parse_ctos_etm, tls_parse_stoc_etm, |
271 | tls_construct_stoc_etm, tls_construct_ctos_etm, NULL | |
6b473aca | 272 | }, |
6dd083fd | 273 | #ifndef OPENSSL_NO_CT |
6b473aca MC |
274 | { |
275 | TLSEXT_TYPE_signed_certificate_timestamp, | |
fe874d27 | 276 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO |
5de683d2 | 277 | | SSL_EXT_TLS1_3_CERTIFICATE | SSL_EXT_TLS1_3_CERTIFICATE_REQUEST, |
68db4dda | 278 | NULL, |
6b473aca MC |
279 | /* |
280 | * No server side support for this, but can be provided by a custom | |
281 | * extension. This is an exception to the rule that custom extensions | |
282 | * cannot override built in ones. | |
283 | */ | |
1266eefd | 284 | NULL, tls_parse_stoc_sct, NULL, tls_construct_ctos_sct, NULL |
6b473aca | 285 | }, |
0785274c MC |
286 | #else |
287 | INVALID_EXTENSION, | |
6dd083fd | 288 | #endif |
6b473aca MC |
289 | { |
290 | TLSEXT_TYPE_extended_master_secret, | |
fe874d27 MC |
291 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO |
292 | | SSL_EXT_TLS1_2_AND_BELOW_ONLY, | |
1266eefd MC |
293 | init_ems, tls_parse_ctos_ems, tls_parse_stoc_ems, |
294 | tls_construct_stoc_ems, tls_construct_ctos_ems, final_ems | |
6b473aca | 295 | }, |
c589c34e BK |
296 | { |
297 | TLSEXT_TYPE_signature_algorithms_cert, | |
298 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_3_CERTIFICATE_REQUEST, | |
299 | init_sig_algs_cert, tls_parse_ctos_sig_algs_cert, | |
300 | tls_parse_ctos_sig_algs_cert, | |
301 | /* We do not generate signature_algorithms_cert at present. */ | |
302 | NULL, NULL, NULL | |
303 | }, | |
9d75dce3 TS |
304 | { |
305 | TLSEXT_TYPE_post_handshake_auth, | |
306 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_3_ONLY, | |
307 | init_post_handshake_auth, | |
308 | tls_parse_ctos_post_handshake_auth, NULL, | |
309 | NULL, tls_construct_ctos_post_handshake_auth, | |
310 | NULL, | |
311 | }, | |
10ed1b72 TS |
312 | { |
313 | TLSEXT_TYPE_signature_algorithms, | |
314 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_3_CERTIFICATE_REQUEST, | |
315 | init_sig_algs, tls_parse_ctos_sig_algs, | |
316 | tls_parse_ctos_sig_algs, tls_construct_ctos_sig_algs, | |
317 | tls_construct_ctos_sig_algs, final_sig_algs | |
318 | }, | |
6b473aca MC |
319 | { |
320 | TLSEXT_TYPE_supported_versions, | |
27e462f1 MC |
321 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_3_SERVER_HELLO |
322 | | SSL_EXT_TLS1_3_HELLO_RETRY_REQUEST | SSL_EXT_TLS_IMPLEMENTATION_ONLY, | |
68db4dda | 323 | NULL, |
6b473aca | 324 | /* Processed inline as part of version selection */ |
88050dd1 MC |
325 | NULL, tls_parse_stoc_supported_versions, |
326 | tls_construct_stoc_supported_versions, | |
327 | tls_construct_ctos_supported_versions, NULL | |
6b473aca | 328 | }, |
b2f7e8c0 | 329 | { |
b2f7e8c0 | 330 | TLSEXT_TYPE_psk_kex_modes, |
fe874d27 MC |
331 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS_IMPLEMENTATION_ONLY |
332 | | SSL_EXT_TLS1_3_ONLY, | |
b2f7e8c0 MC |
333 | init_psk_kex_modes, tls_parse_ctos_psk_kex_modes, NULL, NULL, |
334 | tls_construct_ctos_psk_kex_modes, NULL | |
335 | }, | |
6b473aca | 336 | { |
70af3d8e MC |
337 | /* |
338 | * Must be in this list after supported_groups. We need that to have | |
339 | * been parsed before we do this one. | |
340 | */ | |
6b473aca | 341 | TLSEXT_TYPE_key_share, |
fe874d27 MC |
342 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_3_SERVER_HELLO |
343 | | SSL_EXT_TLS1_3_HELLO_RETRY_REQUEST | SSL_EXT_TLS_IMPLEMENTATION_ONLY | |
344 | | SSL_EXT_TLS1_3_ONLY, | |
1266eefd | 345 | NULL, tls_parse_ctos_key_share, tls_parse_stoc_key_share, |
f4bbb37c MC |
346 | tls_construct_stoc_key_share, tls_construct_ctos_key_share, |
347 | final_key_share | |
7da160b0 | 348 | }, |
cfef5027 | 349 | { |
97ea1e7f | 350 | /* Must be after key_share */ |
cfef5027 | 351 | TLSEXT_TYPE_cookie, |
fe874d27 MC |
352 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_3_HELLO_RETRY_REQUEST |
353 | | SSL_EXT_TLS_IMPLEMENTATION_ONLY | SSL_EXT_TLS1_3_ONLY, | |
43054d3d MC |
354 | NULL, tls_parse_ctos_cookie, tls_parse_stoc_cookie, |
355 | tls_construct_stoc_cookie, tls_construct_ctos_cookie, NULL | |
cfef5027 | 356 | }, |
7da160b0 MC |
357 | { |
358 | /* | |
359 | * Special unsolicited ServerHello extension only used when | |
23fed8ba MC |
360 | * SSL_OP_CRYPTOPRO_TLSEXT_BUG is set. We allow it in a ClientHello but |
361 | * ignore it. | |
7da160b0 MC |
362 | */ |
363 | TLSEXT_TYPE_cryptopro_bug, | |
23fed8ba MC |
364 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO |
365 | | SSL_EXT_TLS1_2_AND_BELOW_ONLY, | |
1266eefd | 366 | NULL, NULL, NULL, tls_construct_stoc_cryptopro_bug, NULL, NULL |
ab83e314 | 367 | }, |
b67cb09f TS |
368 | { |
369 | TLSEXT_TYPE_compress_certificate, | |
370 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_3_CERTIFICATE_REQUEST | |
371 | | SSL_EXT_TLS_IMPLEMENTATION_ONLY | SSL_EXT_TLS1_3_ONLY, | |
372 | tls_init_compress_certificate, | |
373 | tls_parse_compress_certificate, tls_parse_compress_certificate, | |
374 | tls_construct_compress_certificate, tls_construct_compress_certificate, | |
375 | NULL | |
376 | }, | |
38df5a45 MC |
377 | { |
378 | TLSEXT_TYPE_early_data, | |
fe874d27 | 379 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_3_ENCRYPTED_EXTENSIONS |
6e99ae58 | 380 | | SSL_EXT_TLS1_3_NEW_SESSION_TICKET | SSL_EXT_TLS1_3_ONLY, |
38df5a45 MC |
381 | NULL, tls_parse_ctos_early_data, tls_parse_stoc_early_data, |
382 | tls_construct_stoc_early_data, tls_construct_ctos_early_data, | |
383 | final_early_data | |
384 | }, | |
45615c5f DSH |
385 | { |
386 | TLSEXT_TYPE_certificate_authorities, | |
fe874d27 MC |
387 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_3_CERTIFICATE_REQUEST |
388 | | SSL_EXT_TLS1_3_ONLY, | |
45615c5f DSH |
389 | init_certificate_authorities, |
390 | tls_parse_certificate_authorities, tls_parse_certificate_authorities, | |
391 | tls_construct_certificate_authorities, | |
392 | tls_construct_certificate_authorities, NULL, | |
393 | }, | |
ab83e314 | 394 | { |
ec15acb6 | 395 | /* Must be immediately before pre_shared_key */ |
ab83e314 | 396 | TLSEXT_TYPE_padding, |
fe874d27 | 397 | SSL_EXT_CLIENT_HELLO, |
68db4dda | 398 | NULL, |
ab83e314 | 399 | /* We send this, but don't read it */ |
1266eefd | 400 | NULL, NULL, NULL, tls_construct_ctos_padding, NULL |
ec15acb6 MC |
401 | }, |
402 | { | |
403 | /* Required by the TLSv1.3 spec to always be the last extension */ | |
404 | TLSEXT_TYPE_psk, | |
fe874d27 MC |
405 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_3_SERVER_HELLO |
406 | | SSL_EXT_TLS_IMPLEMENTATION_ONLY | SSL_EXT_TLS1_3_ONLY, | |
0247086d | 407 | NULL, tls_parse_ctos_psk, tls_parse_stoc_psk, tls_construct_stoc_psk, |
efe0f315 | 408 | tls_construct_ctos_psk, final_psk |
6b473aca MC |
409 | } |
410 | }; | |
411 | ||
ac44deaf TS |
412 | /* Returns a TLSEXT_TYPE for the given index */ |
413 | unsigned int ossl_get_extension_type(size_t idx) | |
414 | { | |
415 | size_t num_exts = OSSL_NELEM(ext_defs); | |
416 | ||
417 | if (idx >= num_exts) | |
418 | return TLSEXT_TYPE_out_of_range; | |
419 | ||
420 | return ext_defs[idx].type; | |
421 | } | |
422 | ||
43ae5eed | 423 | /* Check whether an extension's context matches the current context */ |
38b051a1 TM |
424 | static int validate_context(SSL_CONNECTION *s, unsigned int extctx, |
425 | unsigned int thisctx) | |
43ae5eed MC |
426 | { |
427 | /* Check we're allowed to use this extension in this context */ | |
428 | if ((thisctx & extctx) == 0) | |
429 | return 0; | |
430 | ||
38b051a1 | 431 | if (SSL_CONNECTION_IS_DTLS(s)) { |
43ae5eed MC |
432 | if ((extctx & SSL_EXT_TLS_ONLY) != 0) |
433 | return 0; | |
434 | } else if ((extctx & SSL_EXT_DTLS_ONLY) != 0) { | |
435 | return 0; | |
436 | } | |
437 | ||
438 | return 1; | |
439 | } | |
440 | ||
38b051a1 TM |
441 | int tls_validate_all_contexts(SSL_CONNECTION *s, unsigned int thisctx, |
442 | RAW_EXTENSION *exts) | |
88050dd1 MC |
443 | { |
444 | size_t i, num_exts, builtin_num = OSSL_NELEM(ext_defs), offset; | |
445 | RAW_EXTENSION *thisext; | |
446 | unsigned int context; | |
447 | ENDPOINT role = ENDPOINT_BOTH; | |
448 | ||
449 | if ((thisctx & SSL_EXT_CLIENT_HELLO) != 0) | |
450 | role = ENDPOINT_SERVER; | |
451 | else if ((thisctx & SSL_EXT_TLS1_2_SERVER_HELLO) != 0) | |
452 | role = ENDPOINT_CLIENT; | |
453 | ||
454 | /* Calculate the number of extensions in the extensions list */ | |
455 | num_exts = builtin_num + s->cert->custext.meths_count; | |
456 | ||
457 | for (thisext = exts, i = 0; i < num_exts; i++, thisext++) { | |
458 | if (!thisext->present) | |
459 | continue; | |
460 | ||
461 | if (i < builtin_num) { | |
462 | context = ext_defs[i].context; | |
463 | } else { | |
464 | custom_ext_method *meth = NULL; | |
465 | ||
466 | meth = custom_ext_find(&s->cert->custext, role, thisext->type, | |
467 | &offset); | |
468 | if (!ossl_assert(meth != NULL)) | |
469 | return 0; | |
470 | context = meth->context; | |
471 | } | |
472 | ||
473 | if (!validate_context(s, context, thisctx)) | |
474 | return 0; | |
475 | } | |
476 | ||
477 | return 1; | |
478 | } | |
479 | ||
6b473aca MC |
480 | /* |
481 | * Verify whether we are allowed to use the extension |type| in the current | |
482 | * |context|. Returns 1 to indicate the extension is allowed or unknown or 0 to | |
70af3d8e | 483 | * indicate the extension is not allowed. If returning 1 then |*found| is set to |
69687aa8 | 484 | * the definition for the extension we found. |
6b473aca | 485 | */ |
38b051a1 TM |
486 | static int verify_extension(SSL_CONNECTION *s, unsigned int context, |
487 | unsigned int type, custom_ext_methods *meths, | |
488 | RAW_EXTENSION *rawexlist, RAW_EXTENSION **found) | |
6b473aca MC |
489 | { |
490 | size_t i; | |
70af3d8e | 491 | size_t builtin_num = OSSL_NELEM(ext_defs); |
d270de32 | 492 | const EXTENSION_DEFINITION *thisext; |
6b473aca | 493 | |
1266eefd MC |
494 | for (i = 0, thisext = ext_defs; i < builtin_num; i++, thisext++) { |
495 | if (type == thisext->type) { | |
43ae5eed | 496 | if (!validate_context(s, thisext->context, context)) |
6b473aca MC |
497 | return 0; |
498 | ||
1266eefd | 499 | *found = &rawexlist[i]; |
6b473aca MC |
500 | return 1; |
501 | } | |
502 | } | |
503 | ||
70af3d8e MC |
504 | /* Check the custom extensions */ |
505 | if (meths != NULL) { | |
43ae5eed | 506 | size_t offset = 0; |
787d9ec7 | 507 | ENDPOINT role = ENDPOINT_BOTH; |
43ae5eed MC |
508 | custom_ext_method *meth = NULL; |
509 | ||
510 | if ((context & SSL_EXT_CLIENT_HELLO) != 0) | |
787d9ec7 | 511 | role = ENDPOINT_SERVER; |
43ae5eed | 512 | else if ((context & SSL_EXT_TLS1_2_SERVER_HELLO) != 0) |
787d9ec7 | 513 | role = ENDPOINT_CLIENT; |
43ae5eed | 514 | |
787d9ec7 | 515 | meth = custom_ext_find(meths, role, type, &offset); |
43ae5eed MC |
516 | if (meth != NULL) { |
517 | if (!validate_context(s, meth->context, context)) | |
518 | return 0; | |
519 | *found = &rawexlist[offset + builtin_num]; | |
520 | return 1; | |
6b473aca MC |
521 | } |
522 | } | |
523 | ||
70af3d8e | 524 | /* Unknown extension. We allow it */ |
1266eefd | 525 | *found = NULL; |
70af3d8e | 526 | return 1; |
6b473aca MC |
527 | } |
528 | ||
70af3d8e MC |
529 | /* |
530 | * Check whether the context defined for an extension |extctx| means whether | |
531 | * the extension is relevant for the current context |thisctx| or not. Returns | |
532 | * 1 if the extension is relevant for this context, and 0 otherwise | |
533 | */ | |
38b051a1 TM |
534 | int extension_is_relevant(SSL_CONNECTION *s, unsigned int extctx, |
535 | unsigned int thisctx) | |
805a2e9e | 536 | { |
a2b97bdf MC |
537 | int is_tls13; |
538 | ||
539 | /* | |
540 | * For HRR we haven't selected the version yet but we know it will be | |
541 | * TLSv1.3 | |
542 | */ | |
543 | if ((thisctx & SSL_EXT_TLS1_3_HELLO_RETRY_REQUEST) != 0) | |
544 | is_tls13 = 1; | |
545 | else | |
38b051a1 | 546 | is_tls13 = SSL_CONNECTION_IS_TLS13(s); |
a2b97bdf | 547 | |
38b051a1 | 548 | if ((SSL_CONNECTION_IS_DTLS(s) |
fe874d27 | 549 | && (extctx & SSL_EXT_TLS_IMPLEMENTATION_ONLY) != 0) |
805a2e9e | 550 | || (s->version == SSL3_VERSION |
fe874d27 | 551 | && (extctx & SSL_EXT_SSL3_ALLOWED) == 0) |
ee36b963 BK |
552 | /* |
553 | * Note that SSL_IS_TLS13() means "TLS 1.3 has been negotiated", | |
554 | * which is never true when generating the ClientHello. | |
555 | * However, version negotiation *has* occurred by the time the | |
556 | * ClientHello extensions are being parsed. | |
557 | * Be careful to allow TLS 1.3-only extensions when generating | |
558 | * the ClientHello. | |
559 | */ | |
a2b97bdf | 560 | || (is_tls13 && (extctx & SSL_EXT_TLS1_2_AND_BELOW_ONLY) != 0) |
ee36b963 BK |
561 | || (!is_tls13 && (extctx & SSL_EXT_TLS1_3_ONLY) != 0 |
562 | && (thisctx & SSL_EXT_CLIENT_HELLO) == 0) | |
563 | || (s->server && !is_tls13 && (extctx & SSL_EXT_TLS1_3_ONLY) != 0) | |
43ae5eed | 564 | || (s->hit && (extctx & SSL_EXT_IGNORE_ON_RESUMPTION) != 0)) |
805a2e9e | 565 | return 0; |
805a2e9e MC |
566 | return 1; |
567 | } | |
568 | ||
6b473aca MC |
569 | /* |
570 | * Gather a list of all the extensions from the data in |packet]. |context| | |
70af3d8e | 571 | * tells us which message this extension is for. The raw extension data is |
29bfd5b7 MC |
572 | * stored in |*res| on success. We don't actually process the content of the |
573 | * extensions yet, except to check their types. This function also runs the | |
574 | * initialiser functions for all known extensions if |init| is nonzero (whether | |
575 | * we have collected them or not). If successful the caller is responsible for | |
576 | * freeing the contents of |*res|. | |
6b473aca MC |
577 | * |
578 | * Per http://tools.ietf.org/html/rfc5246#section-7.4.1.4, there may not be | |
579 | * more than one extension of the same type in a ClientHello or ServerHello. | |
580 | * This function returns 1 if all extensions are unique and we have parsed their | |
581 | * types, and 0 if the extensions contain duplicates, could not be successfully | |
1266eefd | 582 | * found, or an internal error occurred. We only check duplicates for |
70af3d8e | 583 | * extensions that we know about. We ignore others. |
6b473aca | 584 | */ |
38b051a1 TM |
585 | int tls_collect_extensions(SSL_CONNECTION *s, PACKET *packet, |
586 | unsigned int context, | |
f63a17d6 | 587 | RAW_EXTENSION **res, size_t *len, int init) |
6b473aca MC |
588 | { |
589 | PACKET extensions = *packet; | |
d270de32 | 590 | size_t i = 0; |
fc5ece2e | 591 | size_t num_exts; |
43ae5eed | 592 | custom_ext_methods *exts = &s->cert->custext; |
6b473aca | 593 | RAW_EXTENSION *raw_extensions = NULL; |
d270de32 | 594 | const EXTENSION_DEFINITION *thisexd; |
6b473aca | 595 | |
ecc2f938 MC |
596 | *res = NULL; |
597 | ||
70af3d8e MC |
598 | /* |
599 | * Initialise server side custom extensions. Client side is done during | |
600 | * construction of extensions for the ClientHello. | |
601 | */ | |
43ae5eed MC |
602 | if ((context & SSL_EXT_CLIENT_HELLO) != 0) |
603 | custom_ext_init(&s->cert->custext); | |
70af3d8e | 604 | |
fc5ece2e BK |
605 | num_exts = OSSL_NELEM(ext_defs) + (exts != NULL ? exts->meths_count : 0); |
606 | raw_extensions = OPENSSL_zalloc(num_exts * sizeof(*raw_extensions)); | |
70af3d8e | 607 | if (raw_extensions == NULL) { |
e077455e | 608 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_CRYPTO_LIB); |
70af3d8e MC |
609 | return 0; |
610 | } | |
611 | ||
193b5d76 | 612 | i = 0; |
6b473aca | 613 | while (PACKET_remaining(&extensions) > 0) { |
b186a592 | 614 | unsigned int type, idx; |
6b473aca | 615 | PACKET extension; |
1266eefd | 616 | RAW_EXTENSION *thisex; |
6b473aca MC |
617 | |
618 | if (!PACKET_get_net_2(&extensions, &type) || | |
619 | !PACKET_get_length_prefixed_2(&extensions, &extension)) { | |
c48ffbcc | 620 | SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_R_BAD_EXTENSION); |
6b473aca MC |
621 | goto err; |
622 | } | |
70af3d8e MC |
623 | /* |
624 | * Verify this extension is allowed. We only check duplicates for | |
652a6b7e MC |
625 | * extensions that we recognise. We also have a special case for the |
626 | * PSK extension, which must be the last one in the ClientHello. | |
70af3d8e | 627 | */ |
1266eefd | 628 | if (!verify_extension(s, context, type, exts, raw_extensions, &thisex) |
652a6b7e MC |
629 | || (thisex != NULL && thisex->present == 1) |
630 | || (type == TLSEXT_TYPE_psk | |
fe874d27 | 631 | && (context & SSL_EXT_CLIENT_HELLO) != 0 |
652a6b7e | 632 | && PACKET_remaining(&extensions) != 0)) { |
c48ffbcc | 633 | SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_R_BAD_EXTENSION); |
6b473aca MC |
634 | goto err; |
635 | } | |
b186a592 MC |
636 | idx = thisex - raw_extensions; |
637 | /*- | |
638 | * Check that we requested this extension (if appropriate). Requests can | |
639 | * be sent in the ClientHello and CertificateRequest. Unsolicited | |
640 | * extensions can be sent in the NewSessionTicket. We only do this for | |
641 | * the built-in extensions. Custom extensions have a different but | |
642 | * similar check elsewhere. | |
643 | * Special cases: | |
644 | * - The HRR cookie extension is unsolicited | |
645 | * - The renegotiate extension is unsolicited (the client signals | |
646 | * support via an SCSV) | |
647 | * - The signed_certificate_timestamp extension can be provided by a | |
648 | * custom extension or by the built-in version. We let the extension | |
649 | * itself handle unsolicited response checks. | |
650 | */ | |
651 | if (idx < OSSL_NELEM(ext_defs) | |
652 | && (context & (SSL_EXT_CLIENT_HELLO | |
653 | | SSL_EXT_TLS1_3_CERTIFICATE_REQUEST | |
654 | | SSL_EXT_TLS1_3_NEW_SESSION_TICKET)) == 0 | |
655 | && type != TLSEXT_TYPE_cookie | |
656 | && type != TLSEXT_TYPE_renegotiate | |
657 | && type != TLSEXT_TYPE_signed_certificate_timestamp | |
673e0bbb DB |
658 | && (s->ext.extflags[idx] & SSL_EXT_FLAG_SENT) == 0 |
659 | #ifndef OPENSSL_NO_GOST | |
660 | && !((context & SSL_EXT_TLS1_2_SERVER_HELLO) != 0 | |
661 | && type == TLSEXT_TYPE_cryptopro_bug) | |
662 | #endif | |
dd6b2706 | 663 | ) { |
f63a17d6 | 664 | SSLfatal(s, SSL_AD_UNSUPPORTED_EXTENSION, |
c48ffbcc | 665 | SSL_R_UNSOLICITED_EXTENSION); |
b186a592 MC |
666 | goto err; |
667 | } | |
1266eefd MC |
668 | if (thisex != NULL) { |
669 | thisex->data = extension; | |
670 | thisex->present = 1; | |
671 | thisex->type = type; | |
193b5d76 | 672 | thisex->received_order = i++; |
b93a295a | 673 | if (s->ext.debug_cb) |
38b051a1 TM |
674 | s->ext.debug_cb(SSL_CONNECTION_GET_SSL(s), !s->server, |
675 | thisex->type, PACKET_data(&thisex->data), | |
b93a295a TS |
676 | PACKET_remaining(&thisex->data), |
677 | s->ext.debug_arg); | |
6b473aca MC |
678 | } |
679 | } | |
680 | ||
735d5b59 TT |
681 | if (init) { |
682 | /* | |
683 | * Initialise all known extensions relevant to this context, | |
684 | * whether we have found them or not | |
685 | */ | |
686 | for (thisexd = ext_defs, i = 0; i < OSSL_NELEM(ext_defs); | |
687 | i++, thisexd++) { | |
bf5c84f5 TT |
688 | if (thisexd->init != NULL && (thisexd->context & context) != 0 |
689 | && extension_is_relevant(s, thisexd->context, context) | |
690 | && !thisexd->init(s, context)) { | |
f63a17d6 | 691 | /* SSLfatal() already called */ |
735d5b59 TT |
692 | goto err; |
693 | } | |
68db4dda MC |
694 | } |
695 | } | |
696 | ||
6b473aca | 697 | *res = raw_extensions; |
fc5ece2e BK |
698 | if (len != NULL) |
699 | *len = num_exts; | |
6b473aca MC |
700 | return 1; |
701 | ||
702 | err: | |
703 | OPENSSL_free(raw_extensions); | |
704 | return 0; | |
705 | } | |
706 | ||
68db4dda | 707 | /* |
70af3d8e MC |
708 | * Runs the parser for a given extension with index |idx|. |exts| contains the |
709 | * list of all parsed extensions previously collected by | |
710 | * tls_collect_extensions(). The parser is only run if it is applicable for the | |
f97d4c37 MC |
711 | * given |context| and the parser has not already been run. If this is for a |
712 | * Certificate message, then we also provide the parser with the relevant | |
8521ced6 | 713 | * Certificate |x| and its position in the |chainidx| with 0 being the first |
29bfd5b7 MC |
714 | * Certificate. Returns 1 on success or 0 on failure. If an extension is not |
715 | * present this counted as success. | |
68db4dda | 716 | */ |
38b051a1 | 717 | int tls_parse_extension(SSL_CONNECTION *s, TLSEXT_INDEX idx, int context, |
f63a17d6 | 718 | RAW_EXTENSION *exts, X509 *x, size_t chainidx) |
6b473aca | 719 | { |
70af3d8e | 720 | RAW_EXTENSION *currext = &exts[idx]; |
38b051a1 | 721 | int (*parser)(SSL_CONNECTION *s, PACKET *pkt, unsigned int context, X509 *x, |
f63a17d6 | 722 | size_t chainidx) = NULL; |
6b473aca | 723 | |
70af3d8e MC |
724 | /* Skip if the extension is not present */ |
725 | if (!currext->present) | |
726 | return 1; | |
6b473aca | 727 | |
70af3d8e MC |
728 | /* Skip if we've already parsed this extension */ |
729 | if (currext->parsed) | |
730 | return 1; | |
6b473aca | 731 | |
70af3d8e MC |
732 | currext->parsed = 1; |
733 | ||
734 | if (idx < OSSL_NELEM(ext_defs)) { | |
735 | /* We are handling a built-in extension */ | |
736 | const EXTENSION_DEFINITION *extdef = &ext_defs[idx]; | |
737 | ||
738 | /* Check if extension is defined for our protocol. If not, skip */ | |
739 | if (!extension_is_relevant(s, extdef->context, context)) | |
740 | return 1; | |
741 | ||
1266eefd | 742 | parser = s->server ? extdef->parse_ctos : extdef->parse_stoc; |
224135e9 | 743 | |
1266eefd | 744 | if (parser != NULL) |
f63a17d6 | 745 | return parser(s, &currext->data, context, x, chainidx); |
6b473aca | 746 | |
70af3d8e MC |
747 | /* |
748 | * If the parser is NULL we fall through to the custom extension | |
749 | * processing | |
750 | */ | |
6b473aca MC |
751 | } |
752 | ||
43ae5eed | 753 | /* Parse custom extensions */ |
f63a17d6 MC |
754 | return custom_ext_parse(s, context, currext->type, |
755 | PACKET_data(&currext->data), | |
756 | PACKET_remaining(&currext->data), | |
757 | x, chainidx); | |
805a2e9e MC |
758 | } |
759 | ||
760 | /* | |
761 | * Parse all remaining extensions that have not yet been parsed. Also calls the | |
735d5b59 TT |
762 | * finalisation for all extensions at the end if |fin| is nonzero, whether we |
763 | * collected them or not. Returns 1 for success or 0 for failure. If we are | |
764 | * working on a Certificate message then we also pass the Certificate |x| and | |
29bfd5b7 | 765 | * its position in the |chainidx|, with 0 being the first certificate. |
805a2e9e | 766 | */ |
38b051a1 TM |
767 | int tls_parse_all_extensions(SSL_CONNECTION *s, int context, |
768 | RAW_EXTENSION *exts, X509 *x, | |
f63a17d6 | 769 | size_t chainidx, int fin) |
805a2e9e | 770 | { |
1266eefd | 771 | size_t i, numexts = OSSL_NELEM(ext_defs); |
d270de32 | 772 | const EXTENSION_DEFINITION *thisexd; |
805a2e9e | 773 | |
70af3d8e | 774 | /* Calculate the number of extensions in the extensions list */ |
43ae5eed | 775 | numexts += s->cert->custext.meths_count; |
70af3d8e MC |
776 | |
777 | /* Parse each extension in turn */ | |
1266eefd | 778 | for (i = 0; i < numexts; i++) { |
f63a17d6 MC |
779 | if (!tls_parse_extension(s, i, context, exts, x, chainidx)) { |
780 | /* SSLfatal() already called */ | |
70af3d8e | 781 | return 0; |
f63a17d6 | 782 | } |
70af3d8e | 783 | } |
805a2e9e | 784 | |
735d5b59 TT |
785 | if (fin) { |
786 | /* | |
787 | * Finalise all known extensions relevant to this context, | |
788 | * whether we have found them or not | |
789 | */ | |
790 | for (i = 0, thisexd = ext_defs; i < OSSL_NELEM(ext_defs); | |
791 | i++, thisexd++) { | |
bf5c84f5 | 792 | if (thisexd->final != NULL && (thisexd->context & context) != 0 |
f63a17d6 MC |
793 | && !thisexd->final(s, context, exts[i].present)) { |
794 | /* SSLfatal() already called */ | |
735d5b59 | 795 | return 0; |
f63a17d6 | 796 | } |
735d5b59 | 797 | } |
68db4dda MC |
798 | } |
799 | ||
6b473aca MC |
800 | return 1; |
801 | } | |
802 | ||
38b051a1 TM |
803 | int should_add_extension(SSL_CONNECTION *s, unsigned int extctx, |
804 | unsigned int thisctx, int max_version) | |
43ae5eed MC |
805 | { |
806 | /* Skip if not relevant for our context */ | |
807 | if ((extctx & thisctx) == 0) | |
808 | return 0; | |
809 | ||
810 | /* Check if this extension is defined for our protocol. If not, skip */ | |
ee36b963 | 811 | if (!extension_is_relevant(s, extctx, thisctx) |
43ae5eed MC |
812 | || ((extctx & SSL_EXT_TLS1_3_ONLY) != 0 |
813 | && (thisctx & SSL_EXT_CLIENT_HELLO) != 0 | |
38b051a1 | 814 | && (SSL_CONNECTION_IS_DTLS(s) || max_version < TLS1_3_VERSION))) |
43ae5eed MC |
815 | return 0; |
816 | ||
817 | return 1; | |
818 | } | |
819 | ||
6b473aca | 820 | /* |
70af3d8e | 821 | * Construct all the extensions relevant to the current |context| and write |
30aeba43 | 822 | * them to |pkt|. If this is an extension for a Certificate in a Certificate |
8521ced6 MC |
823 | * message, then |x| will be set to the Certificate we are handling, and |
824 | * |chainidx| will indicate the position in the chainidx we are processing (with | |
f63a17d6 | 825 | * 0 being the first in the chain). Returns 1 on success or 0 on failure. On a |
8521ced6 | 826 | * failure construction stops at the first extension to fail to construct. |
6b473aca | 827 | */ |
38b051a1 TM |
828 | int tls_construct_extensions(SSL_CONNECTION *s, WPACKET *pkt, |
829 | unsigned int context, | |
f63a17d6 | 830 | X509 *x, size_t chainidx) |
224135e9 | 831 | { |
1266eefd | 832 | size_t i; |
f63a17d6 | 833 | int min_version, max_version = 0, reason; |
d270de32 | 834 | const EXTENSION_DEFINITION *thisexd; |
72620ac7 | 835 | int for_comp = (context & SSL_EXT_TLS1_3_CERTIFICATE_COMPRESSION) != 0; |
224135e9 MC |
836 | |
837 | if (!WPACKET_start_sub_packet_u16(pkt) | |
838 | /* | |
839 | * If extensions are of zero length then we don't even add the | |
1c259bb5 BK |
840 | * extensions length bytes to a ClientHello/ServerHello |
841 | * (for non-TLSv1.3). | |
224135e9 | 842 | */ |
fe874d27 MC |
843 | || ((context & |
844 | (SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO)) != 0 | |
fe874d27 | 845 | && !WPACKET_set_flags(pkt, |
72620ac7 TS |
846 | WPACKET_FLAGS_ABANDON_ON_ZERO_LENGTH))) { |
847 | if (!for_comp) | |
848 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); | |
f63a17d6 | 849 | return 0; |
224135e9 MC |
850 | } |
851 | ||
fe874d27 | 852 | if ((context & SSL_EXT_CLIENT_HELLO) != 0) { |
b5b993b2 | 853 | reason = ssl_get_min_max_version(s, &min_version, &max_version, NULL); |
ab83e314 | 854 | if (reason != 0) { |
72620ac7 TS |
855 | if (!for_comp) |
856 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, reason); | |
f63a17d6 | 857 | return 0; |
ab83e314 MC |
858 | } |
859 | } | |
860 | ||
861 | /* Add custom extensions first */ | |
fe874d27 | 862 | if ((context & SSL_EXT_CLIENT_HELLO) != 0) { |
44e69951 | 863 | /* On the server side with initialise during ClientHello parsing */ |
43ae5eed | 864 | custom_ext_init(&s->cert->custext); |
ab83e314 | 865 | } |
f63a17d6 MC |
866 | if (!custom_ext_add(s, context, pkt, x, chainidx, max_version)) { |
867 | /* SSLfatal() already called */ | |
868 | return 0; | |
ab83e314 MC |
869 | } |
870 | ||
1266eefd | 871 | for (i = 0, thisexd = ext_defs; i < OSSL_NELEM(ext_defs); i++, thisexd++) { |
38b051a1 TM |
872 | EXT_RETURN (*construct)(SSL_CONNECTION *s, WPACKET *pkt, |
873 | unsigned int context, | |
f63a17d6 | 874 | X509 *x, size_t chainidx); |
b186a592 | 875 | EXT_RETURN ret; |
4b299b8e | 876 | |
224135e9 | 877 | /* Skip if not relevant for our context */ |
43ae5eed | 878 | if (!should_add_extension(s, thisexd->context, context, max_version)) |
224135e9 MC |
879 | continue; |
880 | ||
1266eefd MC |
881 | construct = s->server ? thisexd->construct_stoc |
882 | : thisexd->construct_ctos; | |
224135e9 | 883 | |
43ae5eed | 884 | if (construct == NULL) |
224135e9 MC |
885 | continue; |
886 | ||
f63a17d6 MC |
887 | ret = construct(s, pkt, context, x, chainidx); |
888 | if (ret == EXT_RETURN_FAIL) { | |
889 | /* SSLfatal() already called */ | |
890 | return 0; | |
891 | } | |
b186a592 MC |
892 | if (ret == EXT_RETURN_SENT |
893 | && (context & (SSL_EXT_CLIENT_HELLO | |
894 | | SSL_EXT_TLS1_3_CERTIFICATE_REQUEST | |
895 | | SSL_EXT_TLS1_3_NEW_SESSION_TICKET)) != 0) | |
896 | s->ext.extflags[i] |= SSL_EXT_FLAG_SENT; | |
224135e9 MC |
897 | } |
898 | ||
224135e9 | 899 | if (!WPACKET_close(pkt)) { |
72620ac7 TS |
900 | if (!for_comp) |
901 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); | |
f63a17d6 | 902 | return 0; |
224135e9 MC |
903 | } |
904 | ||
905 | return 1; | |
906 | } | |
805a2e9e | 907 | |
70af3d8e MC |
908 | /* |
909 | * Built in extension finalisation and initialisation functions. All initialise | |
910 | * or finalise the associated extension type for the given |context|. For | |
911 | * finalisers |sent| is set to 1 if we saw the extension during parsing, and 0 | |
29bfd5b7 | 912 | * otherwise. These functions return 1 on success or 0 on failure. |
70af3d8e MC |
913 | */ |
914 | ||
38b051a1 | 915 | static int final_renegotiate(SSL_CONNECTION *s, unsigned int context, int sent) |
805a2e9e | 916 | { |
332eb390 MC |
917 | if (!s->server) { |
918 | /* | |
919 | * Check if we can connect to a server that doesn't support safe | |
920 | * renegotiation | |
921 | */ | |
922 | if (!(s->options & SSL_OP_LEGACY_SERVER_CONNECT) | |
923 | && !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION) | |
924 | && !sent) { | |
c48ffbcc | 925 | SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE, |
f63a17d6 | 926 | SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED); |
332eb390 MC |
927 | return 0; |
928 | } | |
929 | ||
805a2e9e | 930 | return 1; |
332eb390 | 931 | } |
805a2e9e MC |
932 | |
933 | /* Need RI if renegotiating */ | |
934 | if (s->renegotiate | |
935 | && !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION) | |
936 | && !sent) { | |
c48ffbcc | 937 | SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE, |
f63a17d6 | 938 | SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED); |
805a2e9e MC |
939 | return 0; |
940 | } | |
941 | ||
332eb390 | 942 | |
805a2e9e MC |
943 | return 1; |
944 | } | |
945 | ||
acce0557 P |
946 | static ossl_inline void ssl_tsan_decr(const SSL_CTX *ctx, |
947 | TSAN_QUALIFIER int *stat) | |
948 | { | |
949 | if (ssl_tsan_lock(ctx)) { | |
950 | tsan_decr(stat); | |
951 | ssl_tsan_unlock(ctx); | |
952 | } | |
953 | } | |
954 | ||
38b051a1 | 955 | static int init_server_name(SSL_CONNECTION *s, unsigned int context) |
805a2e9e | 956 | { |
f01344cb | 957 | if (s->server) { |
805a2e9e MC |
958 | s->servername_done = 0; |
959 | ||
f01344cb MC |
960 | OPENSSL_free(s->ext.hostname); |
961 | s->ext.hostname = NULL; | |
962 | } | |
963 | ||
805a2e9e MC |
964 | return 1; |
965 | } | |
966 | ||
38b051a1 | 967 | static int final_server_name(SSL_CONNECTION *s, unsigned int context, int sent) |
805a2e9e | 968 | { |
9ef9088c | 969 | int ret = SSL_TLSEXT_ERR_NOACK; |
805a2e9e | 970 | int altmp = SSL_AD_UNRECOGNIZED_NAME; |
38b051a1 TM |
971 | SSL *ssl = SSL_CONNECTION_GET_SSL(s); |
972 | SSL_CTX *sctx = SSL_CONNECTION_GET_CTX(s); | |
973 | int was_ticket = (SSL_get_options(ssl) & SSL_OP_NO_TICKET) == 0; | |
805a2e9e | 974 | |
38b051a1 | 975 | if (!ossl_assert(sctx != NULL) || !ossl_assert(s->session_ctx != NULL)) { |
c48ffbcc | 976 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
c4715212 MC |
977 | return 0; |
978 | } | |
979 | ||
38b051a1 TM |
980 | if (sctx->ext.servername_cb != NULL) |
981 | ret = sctx->ext.servername_cb(ssl, &altmp, | |
982 | sctx->ext.servername_arg); | |
c4715212 | 983 | else if (s->session_ctx->ext.servername_cb != NULL) |
38b051a1 | 984 | ret = s->session_ctx->ext.servername_cb(ssl, &altmp, |
222da979 | 985 | s->session_ctx->ext.servername_arg); |
805a2e9e | 986 | |
1c4aa31d BK |
987 | /* |
988 | * For servers, propagate the SNI hostname from the temporary | |
989 | * storage in the SSL to the persistent SSL_SESSION, now that we | |
990 | * know we accepted it. | |
991 | * Clients make this copy when parsing the server's response to | |
992 | * the extension, which is when they find out that the negotiation | |
993 | * was successful. | |
994 | */ | |
995 | if (s->server) { | |
2a538551 | 996 | if (sent && ret == SSL_TLSEXT_ERR_OK && !s->hit) { |
1c4aa31d BK |
997 | /* Only store the hostname in the session if we accepted it. */ |
998 | OPENSSL_free(s->session->ext.hostname); | |
999 | s->session->ext.hostname = OPENSSL_strdup(s->ext.hostname); | |
1000 | if (s->session->ext.hostname == NULL && s->ext.hostname != NULL) { | |
c48ffbcc | 1001 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
1c4aa31d BK |
1002 | } |
1003 | } | |
9fb6cb81 MC |
1004 | } |
1005 | ||
3be08e30 BK |
1006 | /* |
1007 | * If we switched contexts (whether here or in the client_hello callback), | |
1008 | * move the sess_accept increment from the session_ctx to the new | |
1009 | * context, to avoid the confusing situation of having sess_accept_good | |
1010 | * exceed sess_accept (zero) for the new context. | |
1011 | */ | |
38b051a1 | 1012 | if (SSL_IS_FIRST_HANDSHAKE(s) && sctx != s->session_ctx |
2d6f72aa | 1013 | && s->hello_retry_request == SSL_HRR_NONE) { |
38b051a1 | 1014 | ssl_tsan_counter(sctx, &sctx->stats.sess_accept); |
acce0557 | 1015 | ssl_tsan_decr(s->session_ctx, &s->session_ctx->stats.sess_accept); |
3be08e30 BK |
1016 | } |
1017 | ||
a84e5c9a TS |
1018 | /* |
1019 | * If we're expecting to send a ticket, and tickets were previously enabled, | |
1020 | * and now tickets are disabled, then turn off expected ticket. | |
1021 | * Also, if this is not a resumption, create a new session ID | |
1022 | */ | |
1023 | if (ret == SSL_TLSEXT_ERR_OK && s->ext.ticket_expected | |
38b051a1 | 1024 | && was_ticket && (SSL_get_options(ssl) & SSL_OP_NO_TICKET) != 0) { |
a84e5c9a TS |
1025 | s->ext.ticket_expected = 0; |
1026 | if (!s->hit) { | |
38b051a1 | 1027 | SSL_SESSION* ss = SSL_get_session(ssl); |
a84e5c9a TS |
1028 | |
1029 | if (ss != NULL) { | |
1030 | OPENSSL_free(ss->ext.tick); | |
1031 | ss->ext.tick = NULL; | |
1032 | ss->ext.ticklen = 0; | |
1033 | ss->ext.tick_lifetime_hint = 0; | |
1034 | ss->ext.tick_age_add = 0; | |
a84e5c9a | 1035 | if (!ssl_generate_session_id(s, ss)) { |
c48ffbcc | 1036 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
f63a17d6 | 1037 | return 0; |
a84e5c9a TS |
1038 | } |
1039 | } else { | |
c48ffbcc | 1040 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
f63a17d6 | 1041 | return 0; |
a84e5c9a TS |
1042 | } |
1043 | } | |
1044 | } | |
1045 | ||
805a2e9e MC |
1046 | switch (ret) { |
1047 | case SSL_TLSEXT_ERR_ALERT_FATAL: | |
c48ffbcc | 1048 | SSLfatal(s, altmp, SSL_R_CALLBACK_FAILED); |
805a2e9e MC |
1049 | return 0; |
1050 | ||
1051 | case SSL_TLSEXT_ERR_ALERT_WARNING: | |
fb62e47c | 1052 | /* TLSv1.3 doesn't have warning alerts so we suppress this */ |
38b051a1 | 1053 | if (!SSL_CONNECTION_IS_TLS13(s)) |
fb62e47c | 1054 | ssl3_send_alert(s, SSL3_AL_WARNING, altmp); |
cd624ccd | 1055 | s->servername_done = 0; |
805a2e9e MC |
1056 | return 1; |
1057 | ||
1058 | case SSL_TLSEXT_ERR_NOACK: | |
1059 | s->servername_done = 0; | |
1060 | return 1; | |
1061 | ||
1062 | default: | |
1063 | return 1; | |
1064 | } | |
1065 | } | |
1066 | ||
38b051a1 TM |
1067 | static int final_ec_pt_formats(SSL_CONNECTION *s, unsigned int context, |
1068 | int sent) | |
332eb390 MC |
1069 | { |
1070 | unsigned long alg_k, alg_a; | |
1071 | ||
1072 | if (s->server) | |
1073 | return 1; | |
1074 | ||
555cbb32 TS |
1075 | alg_k = s->s3.tmp.new_cipher->algorithm_mkey; |
1076 | alg_a = s->s3.tmp.new_cipher->algorithm_auth; | |
332eb390 MC |
1077 | |
1078 | /* | |
1079 | * If we are client and using an elliptic curve cryptography cipher | |
1080 | * suite, then if server returns an EC point formats lists extension it | |
1081 | * must contain uncompressed. | |
1082 | */ | |
aff8c126 RS |
1083 | if (s->ext.ecpointformats != NULL |
1084 | && s->ext.ecpointformats_len > 0 | |
cd0fb43c MC |
1085 | && s->ext.peer_ecpointformats != NULL |
1086 | && s->ext.peer_ecpointformats_len > 0 | |
1266eefd | 1087 | && ((alg_k & SSL_kECDHE) || (alg_a & SSL_aECDSA))) { |
332eb390 MC |
1088 | /* we are using an ECC cipher */ |
1089 | size_t i; | |
cd0fb43c | 1090 | unsigned char *list = s->ext.peer_ecpointformats; |
1266eefd | 1091 | |
cd0fb43c | 1092 | for (i = 0; i < s->ext.peer_ecpointformats_len; i++) { |
1266eefd | 1093 | if (*list++ == TLSEXT_ECPOINTFORMAT_uncompressed) |
332eb390 | 1094 | break; |
332eb390 | 1095 | } |
cd0fb43c | 1096 | if (i == s->ext.peer_ecpointformats_len) { |
c48ffbcc | 1097 | SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, |
f63a17d6 | 1098 | SSL_R_TLS_INVALID_ECPOINTFORMAT_LIST); |
332eb390 MC |
1099 | return 0; |
1100 | } | |
1101 | } | |
1102 | ||
1103 | return 1; | |
1104 | } | |
332eb390 | 1105 | |
38b051a1 | 1106 | static int init_session_ticket(SSL_CONNECTION *s, unsigned int context) |
332eb390 MC |
1107 | { |
1108 | if (!s->server) | |
aff8c126 | 1109 | s->ext.ticket_expected = 0; |
332eb390 MC |
1110 | |
1111 | return 1; | |
1112 | } | |
1113 | ||
8f8c11d8 | 1114 | #ifndef OPENSSL_NO_OCSP |
38b051a1 | 1115 | static int init_status_request(SSL_CONNECTION *s, unsigned int context) |
805a2e9e | 1116 | { |
f63e4288 | 1117 | if (s->server) { |
aff8c126 | 1118 | s->ext.status_type = TLSEXT_STATUSTYPE_nothing; |
f63e4288 MC |
1119 | } else { |
1120 | /* | |
1121 | * Ensure we get sensible values passed to tlsext_status_cb in the event | |
1122 | * that we don't receive a status message | |
1123 | */ | |
8cbfcc70 RS |
1124 | OPENSSL_free(s->ext.ocsp.resp); |
1125 | s->ext.ocsp.resp = NULL; | |
1126 | s->ext.ocsp.resp_len = 0; | |
f63e4288 | 1127 | } |
332eb390 MC |
1128 | |
1129 | return 1; | |
1130 | } | |
8f8c11d8 | 1131 | #endif |
332eb390 | 1132 | |
805a2e9e | 1133 | #ifndef OPENSSL_NO_NEXTPROTONEG |
38b051a1 | 1134 | static int init_npn(SSL_CONNECTION *s, unsigned int context) |
805a2e9e | 1135 | { |
555cbb32 | 1136 | s->s3.npn_seen = 0; |
805a2e9e MC |
1137 | |
1138 | return 1; | |
1139 | } | |
1140 | #endif | |
1141 | ||
38b051a1 | 1142 | static int init_alpn(SSL_CONNECTION *s, unsigned int context) |
805a2e9e | 1143 | { |
555cbb32 TS |
1144 | OPENSSL_free(s->s3.alpn_selected); |
1145 | s->s3.alpn_selected = NULL; | |
1146 | s->s3.alpn_selected_len = 0; | |
805a2e9e | 1147 | if (s->server) { |
555cbb32 TS |
1148 | OPENSSL_free(s->s3.alpn_proposed); |
1149 | s->s3.alpn_proposed = NULL; | |
1150 | s->s3.alpn_proposed_len = 0; | |
805a2e9e | 1151 | } |
805a2e9e MC |
1152 | return 1; |
1153 | } | |
1154 | ||
38b051a1 | 1155 | static int final_alpn(SSL_CONNECTION *s, unsigned int context, int sent) |
630369d9 | 1156 | { |
4be3a7c7 MC |
1157 | if (!s->server && !sent && s->session->ext.alpn_selected != NULL) |
1158 | s->ext.early_data_ok = 0; | |
1159 | ||
38b051a1 | 1160 | if (!s->server || !SSL_CONNECTION_IS_TLS13(s)) |
630369d9 MC |
1161 | return 1; |
1162 | ||
1163 | /* | |
1164 | * Call alpn_select callback if needed. Has to be done after SNI and | |
1165 | * cipher negotiation (HTTP/2 restricts permitted ciphers). In TLSv1.3 | |
1166 | * we also have to do this before we decide whether to accept early_data. | |
1167 | * In TLSv1.3 we've already negotiated our cipher so we do this call now. | |
1168 | * For < TLSv1.3 we defer it until after cipher negotiation. | |
56d36288 | 1169 | * |
f63a17d6 | 1170 | * On failure SSLfatal() already called. |
630369d9 | 1171 | */ |
f63a17d6 | 1172 | return tls_handle_alpn(s); |
630369d9 MC |
1173 | } |
1174 | ||
38b051a1 | 1175 | static int init_sig_algs(SSL_CONNECTION *s, unsigned int context) |
805a2e9e MC |
1176 | { |
1177 | /* Clear any signature algorithms extension received */ | |
555cbb32 TS |
1178 | OPENSSL_free(s->s3.tmp.peer_sigalgs); |
1179 | s->s3.tmp.peer_sigalgs = NULL; | |
02b1636f | 1180 | s->s3.tmp.peer_sigalgslen = 0; |
805a2e9e MC |
1181 | |
1182 | return 1; | |
1183 | } | |
1184 | ||
38b051a1 TM |
1185 | static int init_sig_algs_cert(SSL_CONNECTION *s, |
1186 | ossl_unused unsigned int context) | |
c589c34e BK |
1187 | { |
1188 | /* Clear any signature algorithms extension received */ | |
555cbb32 TS |
1189 | OPENSSL_free(s->s3.tmp.peer_cert_sigalgs); |
1190 | s->s3.tmp.peer_cert_sigalgs = NULL; | |
39a14059 | 1191 | s->s3.tmp.peer_cert_sigalgslen = 0; |
c589c34e BK |
1192 | |
1193 | return 1; | |
1194 | } | |
1195 | ||
805a2e9e | 1196 | #ifndef OPENSSL_NO_SRP |
38b051a1 | 1197 | static int init_srp(SSL_CONNECTION *s, unsigned int context) |
805a2e9e MC |
1198 | { |
1199 | OPENSSL_free(s->srp_ctx.login); | |
1200 | s->srp_ctx.login = NULL; | |
1201 | ||
1202 | return 1; | |
1203 | } | |
1204 | #endif | |
1205 | ||
38b051a1 | 1206 | static int init_ec_point_formats(SSL_CONNECTION *s, unsigned int context) |
3f987381 DB |
1207 | { |
1208 | OPENSSL_free(s->ext.peer_ecpointformats); | |
1209 | s->ext.peer_ecpointformats = NULL; | |
1210 | s->ext.peer_ecpointformats_len = 0; | |
1211 | ||
1212 | return 1; | |
1213 | } | |
1214 | ||
38b051a1 | 1215 | static int init_etm(SSL_CONNECTION *s, unsigned int context) |
805a2e9e | 1216 | { |
28a31a0a | 1217 | s->ext.use_etm = 0; |
332eb390 MC |
1218 | |
1219 | return 1; | |
1220 | } | |
1221 | ||
38b051a1 | 1222 | static int init_ems(SSL_CONNECTION *s, unsigned int context) |
332eb390 | 1223 | { |
11d3235e TM |
1224 | if (s->s3.flags & TLS1_FLAGS_RECEIVED_EXTMS) { |
1225 | s->s3.flags &= ~TLS1_FLAGS_RECEIVED_EXTMS; | |
1226 | s->s3.flags |= TLS1_FLAGS_REQUIRED_EXTMS; | |
1227 | } | |
332eb390 MC |
1228 | |
1229 | return 1; | |
1230 | } | |
1231 | ||
38b051a1 | 1232 | static int final_ems(SSL_CONNECTION *s, unsigned int context, int sent) |
332eb390 | 1233 | { |
11d3235e TM |
1234 | /* |
1235 | * Check extended master secret extension is not dropped on | |
1236 | * renegotiation. | |
1237 | */ | |
1238 | if (!(s->s3.flags & TLS1_FLAGS_RECEIVED_EXTMS) | |
1239 | && (s->s3.flags & TLS1_FLAGS_REQUIRED_EXTMS)) { | |
c48ffbcc | 1240 | SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE, SSL_R_INCONSISTENT_EXTMS); |
11d3235e TM |
1241 | return 0; |
1242 | } | |
332eb390 MC |
1243 | if (!s->server && s->hit) { |
1244 | /* | |
1245 | * Check extended master secret extension is consistent with | |
1246 | * original session. | |
1247 | */ | |
555cbb32 | 1248 | if (!(s->s3.flags & TLS1_FLAGS_RECEIVED_EXTMS) != |
332eb390 | 1249 | !(s->session->flags & SSL_SESS_FLAG_EXTMS)) { |
c48ffbcc | 1250 | SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE, SSL_R_INCONSISTENT_EXTMS); |
332eb390 MC |
1251 | return 0; |
1252 | } | |
1253 | } | |
805a2e9e MC |
1254 | |
1255 | return 1; | |
1256 | } | |
1257 | ||
38b051a1 | 1258 | static int init_certificate_authorities(SSL_CONNECTION *s, unsigned int context) |
45615c5f | 1259 | { |
555cbb32 TS |
1260 | sk_X509_NAME_pop_free(s->s3.tmp.peer_ca_names, X509_NAME_free); |
1261 | s->s3.tmp.peer_ca_names = NULL; | |
45615c5f DSH |
1262 | return 1; |
1263 | } | |
1264 | ||
38b051a1 TM |
1265 | static EXT_RETURN tls_construct_certificate_authorities(SSL_CONNECTION *s, |
1266 | WPACKET *pkt, | |
b186a592 MC |
1267 | unsigned int context, |
1268 | X509 *x, | |
f63a17d6 | 1269 | size_t chainidx) |
45615c5f | 1270 | { |
98732979 | 1271 | const STACK_OF(X509_NAME) *ca_sk = get_ca_names(s); |
45615c5f DSH |
1272 | |
1273 | if (ca_sk == NULL || sk_X509_NAME_num(ca_sk) == 0) | |
b186a592 | 1274 | return EXT_RETURN_NOT_SENT; |
45615c5f DSH |
1275 | |
1276 | if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_certificate_authorities) | |
f63a17d6 | 1277 | || !WPACKET_start_sub_packet_u16(pkt)) { |
c48ffbcc | 1278 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
b186a592 | 1279 | return EXT_RETURN_FAIL; |
45615c5f DSH |
1280 | } |
1281 | ||
98732979 | 1282 | if (!construct_ca_names(s, ca_sk, pkt)) { |
f63a17d6 MC |
1283 | /* SSLfatal() already called */ |
1284 | return EXT_RETURN_FAIL; | |
1285 | } | |
1286 | ||
1287 | if (!WPACKET_close(pkt)) { | |
c48ffbcc | 1288 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
f63a17d6 MC |
1289 | return EXT_RETURN_FAIL; |
1290 | } | |
1291 | ||
b186a592 | 1292 | return EXT_RETURN_SENT; |
45615c5f DSH |
1293 | } |
1294 | ||
38b051a1 | 1295 | static int tls_parse_certificate_authorities(SSL_CONNECTION *s, PACKET *pkt, |
45615c5f | 1296 | unsigned int context, X509 *x, |
f63a17d6 | 1297 | size_t chainidx) |
45615c5f | 1298 | { |
f63a17d6 | 1299 | if (!parse_ca_names(s, pkt)) |
45615c5f DSH |
1300 | return 0; |
1301 | if (PACKET_remaining(pkt) != 0) { | |
c48ffbcc | 1302 | SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_R_BAD_EXTENSION); |
45615c5f DSH |
1303 | return 0; |
1304 | } | |
1305 | return 1; | |
1306 | } | |
1307 | ||
805a2e9e | 1308 | #ifndef OPENSSL_NO_SRTP |
38b051a1 | 1309 | static int init_srtp(SSL_CONNECTION *s, unsigned int context) |
805a2e9e MC |
1310 | { |
1311 | if (s->server) | |
1312 | s->srtp_profile = NULL; | |
1313 | ||
1314 | return 1; | |
1315 | } | |
1316 | #endif | |
04904312 | 1317 | |
38b051a1 | 1318 | static int final_sig_algs(SSL_CONNECTION *s, unsigned int context, int sent) |
04904312 | 1319 | { |
38b051a1 | 1320 | if (!sent && SSL_CONNECTION_IS_TLS13(s) && !s->hit) { |
c48ffbcc | 1321 | SSLfatal(s, TLS13_AD_MISSING_EXTENSION, |
f63a17d6 | 1322 | SSL_R_MISSING_SIGALGS_EXTENSION); |
04904312 MC |
1323 | return 0; |
1324 | } | |
1325 | ||
1326 | return 1; | |
1327 | } | |
b2f7e8c0 | 1328 | |
38b051a1 | 1329 | static int final_key_share(SSL_CONNECTION *s, unsigned int context, int sent) |
f4bbb37c | 1330 | { |
65dc5c3c | 1331 | #if !defined(OPENSSL_NO_TLS1_3) |
38b051a1 | 1332 | if (!SSL_CONNECTION_IS_TLS13(s)) |
f4bbb37c MC |
1333 | return 1; |
1334 | ||
07d447a6 MC |
1335 | /* Nothing to do for key_share in an HRR */ |
1336 | if ((context & SSL_EXT_TLS1_3_HELLO_RETRY_REQUEST) != 0) | |
1337 | return 1; | |
1338 | ||
f4bbb37c MC |
1339 | /* |
1340 | * If | |
aff9929b MC |
1341 | * we are a client |
1342 | * AND | |
f4bbb37c MC |
1343 | * we have no key_share |
1344 | * AND | |
1345 | * (we are not resuming | |
1346 | * OR the kex_mode doesn't allow non key_share resumes) | |
1347 | * THEN | |
aff9929b | 1348 | * fail; |
f4bbb37c | 1349 | */ |
aff9929b MC |
1350 | if (!s->server |
1351 | && !sent | |
f4bbb37c MC |
1352 | && (!s->hit |
1353 | || (s->ext.psk_kex_mode & TLSEXT_KEX_MODE_FLAG_KE) == 0)) { | |
7d061fce | 1354 | /* Nothing left we can do - just fail */ |
c48ffbcc | 1355 | SSLfatal(s, SSL_AD_MISSING_EXTENSION, SSL_R_NO_SUITABLE_KEY_SHARE); |
f4bbb37c MC |
1356 | return 0; |
1357 | } | |
aff9929b | 1358 | /* |
c36001c3 | 1359 | * IF |
aff9929b | 1360 | * we are a server |
aff9929b | 1361 | * THEN |
c36001c3 MC |
1362 | * IF |
1363 | * we have a suitable key_share | |
aff9929b | 1364 | * THEN |
c36001c3 MC |
1365 | * IF |
1366 | * we are stateless AND we have no cookie | |
1367 | * THEN | |
1368 | * send a HelloRetryRequest | |
1369 | * ELSE | |
1370 | * IF | |
1371 | * we didn't already send a HelloRetryRequest | |
1372 | * AND | |
1373 | * the client sent a key_share extension | |
1374 | * AND | |
1375 | * (we are not resuming | |
1376 | * OR the kex_mode allows key_share resumes) | |
1377 | * AND | |
1378 | * a shared group exists | |
1379 | * THEN | |
1380 | * send a HelloRetryRequest | |
1381 | * ELSE IF | |
1382 | * we are not resuming | |
1383 | * OR | |
1384 | * the kex_mode doesn't allow non key_share resumes | |
1385 | * THEN | |
1386 | * fail | |
1387 | * ELSE IF | |
1388 | * we are stateless AND we have no cookie | |
1389 | * THEN | |
1390 | * send a HelloRetryRequest | |
aff9929b | 1391 | */ |
c36001c3 | 1392 | if (s->server) { |
555cbb32 | 1393 | if (s->s3.peer_tmp != NULL) { |
c36001c3 | 1394 | /* We have a suitable key_share */ |
555cbb32 | 1395 | if ((s->s3.flags & TLS1_FLAGS_STATELESS) != 0 |
c36001c3 MC |
1396 | && !s->ext.cookieok) { |
1397 | if (!ossl_assert(s->hello_retry_request == SSL_HRR_NONE)) { | |
1398 | /* | |
1399 | * If we are stateless then we wouldn't know about any | |
1400 | * previously sent HRR - so how can this be anything other | |
1401 | * than 0? | |
1402 | */ | |
c48ffbcc | 1403 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
c36001c3 MC |
1404 | return 0; |
1405 | } | |
1406 | s->hello_retry_request = SSL_HRR_PENDING; | |
1407 | return 1; | |
1408 | } | |
1409 | } else { | |
1410 | /* No suitable key_share */ | |
1411 | if (s->hello_retry_request == SSL_HRR_NONE && sent | |
1412 | && (!s->hit | |
1413 | || (s->ext.psk_kex_mode & TLSEXT_KEX_MODE_FLAG_KE_DHE) | |
1414 | != 0)) { | |
1415 | const uint16_t *pgroups, *clntgroups; | |
1416 | size_t num_groups, clnt_num_groups, i; | |
1417 | unsigned int group_id = 0; | |
1418 | ||
1419 | /* Check if a shared group exists */ | |
1420 | ||
1421 | /* Get the clients list of supported groups. */ | |
1422 | tls1_get_peer_groups(s, &clntgroups, &clnt_num_groups); | |
1423 | tls1_get_supported_groups(s, &pgroups, &num_groups); | |
1424 | ||
1425 | /* | |
1426 | * Find the first group we allow that is also in client's list | |
1427 | */ | |
1428 | for (i = 0; i < num_groups; i++) { | |
1429 | group_id = pgroups[i]; | |
1430 | ||
1431 | if (check_in_list(s, group_id, clntgroups, clnt_num_groups, | |
16f0e91c | 1432 | 1)) |
c36001c3 MC |
1433 | break; |
1434 | } | |
1435 | ||
1436 | if (i < num_groups) { | |
1437 | /* A shared group exists so send a HelloRetryRequest */ | |
555cbb32 | 1438 | s->s3.group_id = group_id; |
c36001c3 MC |
1439 | s->hello_retry_request = SSL_HRR_PENDING; |
1440 | return 1; | |
1441 | } | |
1442 | } | |
1443 | if (!s->hit | |
1444 | || (s->ext.psk_kex_mode & TLSEXT_KEX_MODE_FLAG_KE) == 0) { | |
1445 | /* Nothing left we can do - just fail */ | |
1446 | SSLfatal(s, sent ? SSL_AD_HANDSHAKE_FAILURE | |
1447 | : SSL_AD_MISSING_EXTENSION, | |
c48ffbcc | 1448 | SSL_R_NO_SUITABLE_KEY_SHARE); |
c36001c3 | 1449 | return 0; |
aff9929b MC |
1450 | } |
1451 | ||
555cbb32 | 1452 | if ((s->s3.flags & TLS1_FLAGS_STATELESS) != 0 |
c36001c3 MC |
1453 | && !s->ext.cookieok) { |
1454 | if (!ossl_assert(s->hello_retry_request == SSL_HRR_NONE)) { | |
1455 | /* | |
1456 | * If we are stateless then we wouldn't know about any | |
1457 | * previously sent HRR - so how can this be anything other | |
1458 | * than 0? | |
1459 | */ | |
c48ffbcc | 1460 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
c36001c3 MC |
1461 | return 0; |
1462 | } | |
fc7129dc | 1463 | s->hello_retry_request = SSL_HRR_PENDING; |
aff9929b MC |
1464 | return 1; |
1465 | } | |
1466 | } | |
c36001c3 MC |
1467 | |
1468 | /* | |
1469 | * We have a key_share so don't send any more HelloRetryRequest | |
1470 | * messages | |
1471 | */ | |
1472 | if (s->hello_retry_request == SSL_HRR_PENDING) | |
1473 | s->hello_retry_request = SSL_HRR_COMPLETE; | |
1474 | } else { | |
1475 | /* | |
1476 | * For a client side resumption with no key_share we need to generate | |
1477 | * the handshake secret (otherwise this is done during key_share | |
1478 | * processing). | |
1479 | */ | |
1480 | if (!sent && !tls13_generate_handshake_secret(s, NULL, 0)) { | |
c48ffbcc | 1481 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
aff9929b MC |
1482 | return 0; |
1483 | } | |
1484 | } | |
65dc5c3c | 1485 | #endif /* !defined(OPENSSL_NO_TLS1_3) */ |
f4bbb37c MC |
1486 | return 1; |
1487 | } | |
1488 | ||
38b051a1 | 1489 | static int init_psk_kex_modes(SSL_CONNECTION *s, unsigned int context) |
b2f7e8c0 MC |
1490 | { |
1491 | s->ext.psk_kex_mode = TLSEXT_KEX_MODE_FLAG_NONE; | |
b2f7e8c0 MC |
1492 | return 1; |
1493 | } | |
1053a6e2 | 1494 | |
38b051a1 TM |
1495 | int tls_psk_do_binder(SSL_CONNECTION *s, const EVP_MD *md, |
1496 | const unsigned char *msgstart, | |
1053a6e2 | 1497 | size_t binderoffset, const unsigned char *binderin, |
3a7c56b2 MC |
1498 | unsigned char *binderout, SSL_SESSION *sess, int sign, |
1499 | int external) | |
1053a6e2 MC |
1500 | { |
1501 | EVP_PKEY *mackey = NULL; | |
1502 | EVP_MD_CTX *mctx = NULL; | |
1503 | unsigned char hash[EVP_MAX_MD_SIZE], binderkey[EVP_MAX_MD_SIZE]; | |
1504 | unsigned char finishedkey[EVP_MAX_MD_SIZE], tmpbinder[EVP_MAX_MD_SIZE]; | |
4ff1a526 | 1505 | unsigned char *early_secret; |
44e47328 TS |
1506 | /* ASCII: "res binder", in hex for EBCDIC compatibility */ |
1507 | static const unsigned char resumption_label[] = "\x72\x65\x73\x20\x62\x69\x6E\x64\x65\x72"; | |
1508 | /* ASCII: "ext binder", in hex for EBCDIC compatibility */ | |
1509 | static const unsigned char external_label[] = "\x65\x78\x74\x20\x62\x69\x6E\x64\x65\x72"; | |
4ff1a526 MC |
1510 | const unsigned char *label; |
1511 | size_t bindersize, labelsize, hashsize; | |
ed576acd | 1512 | int hashsizei = EVP_MD_get_size(md); |
1053a6e2 | 1513 | int ret = -1; |
add8d0e9 | 1514 | int usepskfored = 0; |
38b051a1 | 1515 | SSL_CTX *sctx = SSL_CONNECTION_GET_CTX(s); |
add8d0e9 | 1516 | |
bceae201 MC |
1517 | /* Ensure cast to size_t is safe */ |
1518 | if (!ossl_assert(hashsizei >= 0)) { | |
c48ffbcc | 1519 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
bceae201 MC |
1520 | goto err; |
1521 | } | |
1522 | hashsize = (size_t)hashsizei; | |
1523 | ||
add8d0e9 MC |
1524 | if (external |
1525 | && s->early_data_state == SSL_EARLY_DATA_CONNECTING | |
1526 | && s->session->ext.max_early_data == 0 | |
1527 | && sess->ext.max_early_data > 0) | |
1528 | usepskfored = 1; | |
1053a6e2 | 1529 | |
3a7c56b2 MC |
1530 | if (external) { |
1531 | label = external_label; | |
1532 | labelsize = sizeof(external_label) - 1; | |
1533 | } else { | |
1534 | label = resumption_label; | |
1535 | labelsize = sizeof(resumption_label) - 1; | |
1536 | } | |
1537 | ||
9368f865 MC |
1538 | /* |
1539 | * Generate the early_secret. On the server side we've selected a PSK to | |
1540 | * resume with (internal or external) so we always do this. On the client | |
add8d0e9 MC |
1541 | * side we do this for a non-external (i.e. resumption) PSK or external PSK |
1542 | * that will be used for early_data so that it is in place for sending early | |
1543 | * data. For client side external PSK not being used for early_data we | |
9368f865 MC |
1544 | * generate it but store it away for later use. |
1545 | */ | |
add8d0e9 | 1546 | if (s->server || !external || usepskfored) |
9368f865 MC |
1547 | early_secret = (unsigned char *)s->early_secret; |
1548 | else | |
1549 | early_secret = (unsigned char *)sess->early_secret; | |
4ff1a526 MC |
1550 | |
1551 | if (!tls13_generate_secret(s, md, NULL, sess->master_key, | |
1552 | sess->master_key_length, early_secret)) { | |
635c8f77 | 1553 | /* SSLfatal() already called */ |
1053a6e2 MC |
1554 | goto err; |
1555 | } | |
1556 | ||
1557 | /* | |
1558 | * Create the handshake hash for the binder key...the messages so far are | |
1559 | * empty! | |
1560 | */ | |
1561 | mctx = EVP_MD_CTX_new(); | |
1562 | if (mctx == NULL | |
1563 | || EVP_DigestInit_ex(mctx, md, NULL) <= 0 | |
1564 | || EVP_DigestFinal_ex(mctx, hash, NULL) <= 0) { | |
c48ffbcc | 1565 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
1053a6e2 MC |
1566 | goto err; |
1567 | } | |
1568 | ||
1569 | /* Generate the binder key */ | |
4ff1a526 | 1570 | if (!tls13_hkdf_expand(s, md, early_secret, label, labelsize, hash, |
0fb2815b | 1571 | hashsize, binderkey, hashsize, 1)) { |
635c8f77 | 1572 | /* SSLfatal() already called */ |
1053a6e2 MC |
1573 | goto err; |
1574 | } | |
1575 | ||
1576 | /* Generate the finished key */ | |
1577 | if (!tls13_derive_finishedkey(s, md, binderkey, finishedkey, hashsize)) { | |
635c8f77 | 1578 | /* SSLfatal() already called */ |
1053a6e2 MC |
1579 | goto err; |
1580 | } | |
1581 | ||
aff9929b | 1582 | if (EVP_DigestInit_ex(mctx, md, NULL) <= 0) { |
c48ffbcc | 1583 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
aff9929b MC |
1584 | goto err; |
1585 | } | |
1586 | ||
1053a6e2 | 1587 | /* |
aff9929b MC |
1588 | * Get a hash of the ClientHello up to the start of the binders. If we are |
1589 | * following a HelloRetryRequest then this includes the hash of the first | |
1590 | * ClientHello and the HelloRetryRequest itself. | |
1053a6e2 | 1591 | */ |
fc7129dc | 1592 | if (s->hello_retry_request == SSL_HRR_PENDING) { |
aff9929b | 1593 | size_t hdatalen; |
60690b5b | 1594 | long hdatalen_l; |
aff9929b MC |
1595 | void *hdata; |
1596 | ||
60690b5b | 1597 | hdatalen = hdatalen_l = |
555cbb32 | 1598 | BIO_get_mem_data(s->s3.handshake_buffer, &hdata); |
60690b5b | 1599 | if (hdatalen_l <= 0) { |
c48ffbcc | 1600 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_R_BAD_HANDSHAKE_LENGTH); |
aff9929b MC |
1601 | goto err; |
1602 | } | |
1603 | ||
1604 | /* | |
1605 | * For servers the handshake buffer data will include the second | |
1606 | * ClientHello - which we don't want - so we need to take that bit off. | |
1607 | */ | |
1608 | if (s->server) { | |
77815a02 MC |
1609 | PACKET hashprefix, msg; |
1610 | ||
1611 | /* Find how many bytes are left after the first two messages */ | |
1612 | if (!PACKET_buf_init(&hashprefix, hdata, hdatalen) | |
1613 | || !PACKET_forward(&hashprefix, 1) | |
1614 | || !PACKET_get_length_prefixed_3(&hashprefix, &msg) | |
1615 | || !PACKET_forward(&hashprefix, 1) | |
1616 | || !PACKET_get_length_prefixed_3(&hashprefix, &msg)) { | |
c48ffbcc | 1617 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
aff9929b MC |
1618 | goto err; |
1619 | } | |
77815a02 | 1620 | hdatalen -= PACKET_remaining(&hashprefix); |
aff9929b MC |
1621 | } |
1622 | ||
1623 | if (EVP_DigestUpdate(mctx, hdata, hdatalen) <= 0) { | |
c48ffbcc | 1624 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
aff9929b MC |
1625 | goto err; |
1626 | } | |
1627 | } | |
1628 | ||
1629 | if (EVP_DigestUpdate(mctx, msgstart, binderoffset) <= 0 | |
1053a6e2 | 1630 | || EVP_DigestFinal_ex(mctx, hash, NULL) <= 0) { |
c48ffbcc | 1631 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
1053a6e2 MC |
1632 | goto err; |
1633 | } | |
1634 | ||
38b051a1 TM |
1635 | mackey = EVP_PKEY_new_raw_private_key_ex(sctx->libctx, "HMAC", |
1636 | sctx->propq, finishedkey, | |
d8652be0 | 1637 | hashsize); |
1053a6e2 | 1638 | if (mackey == NULL) { |
c48ffbcc | 1639 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
1053a6e2 MC |
1640 | goto err; |
1641 | } | |
1642 | ||
1643 | if (!sign) | |
1644 | binderout = tmpbinder; | |
1645 | ||
1646 | bindersize = hashsize; | |
38b051a1 TM |
1647 | if (EVP_DigestSignInit_ex(mctx, NULL, EVP_MD_get0_name(md), sctx->libctx, |
1648 | sctx->propq, mackey, NULL) <= 0 | |
1053a6e2 MC |
1649 | || EVP_DigestSignUpdate(mctx, hash, hashsize) <= 0 |
1650 | || EVP_DigestSignFinal(mctx, binderout, &bindersize) <= 0 | |
1651 | || bindersize != hashsize) { | |
c48ffbcc | 1652 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
1053a6e2 MC |
1653 | goto err; |
1654 | } | |
1655 | ||
1656 | if (sign) { | |
1657 | ret = 1; | |
1658 | } else { | |
1659 | /* HMAC keys can't do EVP_DigestVerify* - use CRYPTO_memcmp instead */ | |
1660 | ret = (CRYPTO_memcmp(binderin, binderout, hashsize) == 0); | |
635c8f77 | 1661 | if (!ret) |
c48ffbcc | 1662 | SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_R_BINDER_DOES_NOT_VERIFY); |
1053a6e2 MC |
1663 | } |
1664 | ||
1665 | err: | |
1666 | OPENSSL_cleanse(binderkey, sizeof(binderkey)); | |
1667 | OPENSSL_cleanse(finishedkey, sizeof(finishedkey)); | |
1668 | EVP_PKEY_free(mackey); | |
1669 | EVP_MD_CTX_free(mctx); | |
1670 | ||
1671 | return ret; | |
1672 | } | |
38df5a45 | 1673 | |
38b051a1 | 1674 | static int final_early_data(SSL_CONNECTION *s, unsigned int context, int sent) |
38df5a45 | 1675 | { |
4be3a7c7 MC |
1676 | if (!sent) |
1677 | return 1; | |
1678 | ||
1679 | if (!s->server) { | |
1680 | if (context == SSL_EXT_TLS1_3_ENCRYPTED_EXTENSIONS | |
1681 | && sent | |
1682 | && !s->ext.early_data_ok) { | |
1683 | /* | |
1684 | * If we get here then the server accepted our early_data but we | |
1685 | * later realised that it shouldn't have done (e.g. inconsistent | |
1686 | * ALPN) | |
1687 | */ | |
c48ffbcc | 1688 | SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_R_BAD_EARLY_DATA); |
4be3a7c7 MC |
1689 | return 0; |
1690 | } | |
1691 | ||
38df5a45 | 1692 | return 1; |
4be3a7c7 | 1693 | } |
38df5a45 MC |
1694 | |
1695 | if (s->max_early_data == 0 | |
1696 | || !s->hit | |
38df5a45 MC |
1697 | || s->early_data_state != SSL_EARLY_DATA_ACCEPTING |
1698 | || !s->ext.early_data_ok | |
c9598459 | 1699 | || s->hello_retry_request != SSL_HRR_NONE |
59b2cb26 | 1700 | || (s->allow_early_data_cb != NULL |
38b051a1 | 1701 | && !s->allow_early_data_cb(SSL_CONNECTION_GET_SSL(s), |
59b2cb26 | 1702 | s->allow_early_data_cb_data))) { |
38df5a45 MC |
1703 | s->ext.early_data = SSL_EARLY_DATA_REJECTED; |
1704 | } else { | |
1705 | s->ext.early_data = SSL_EARLY_DATA_ACCEPTED; | |
1706 | ||
1707 | if (!tls13_change_cipher_state(s, | |
1708 | SSL3_CC_EARLY | SSL3_CHANGE_CIPHER_SERVER_READ)) { | |
f63a17d6 | 1709 | /* SSLfatal() already called */ |
38df5a45 MC |
1710 | return 0; |
1711 | } | |
1712 | } | |
1713 | ||
1714 | return 1; | |
1715 | } | |
cf72c757 | 1716 | |
38b051a1 TM |
1717 | static int final_maxfragmentlen(SSL_CONNECTION *s, unsigned int context, |
1718 | int sent) | |
cf72c757 F |
1719 | { |
1720 | /* | |
1721 | * Session resumption on server-side with MFL extension active | |
1722 | * BUT MFL extension packet was not resent (i.e. sent == 0) | |
1723 | */ | |
f63a17d6 | 1724 | if (s->server && s->hit && USE_MAX_FRAGMENT_LENGTH_EXT(s->session) |
cf72c757 | 1725 | && !sent ) { |
c48ffbcc | 1726 | SSLfatal(s, SSL_AD_MISSING_EXTENSION, SSL_R_BAD_EXTENSION); |
cf72c757 F |
1727 | return 0; |
1728 | } | |
1729 | ||
435d88d7 MC |
1730 | if (s->session && USE_MAX_FRAGMENT_LENGTH_EXT(s->session)) { |
1731 | s->rlayer.rrlmethod->set_max_frag_len(s->rlayer.rrl, | |
1732 | GET_MAX_FRAGMENT_LENGTH(s->session)); | |
1733 | s->rlayer.wrlmethod->set_max_frag_len(s->rlayer.wrl, | |
1734 | ssl_get_max_send_fragment(s)); | |
435d88d7 | 1735 | } |
cf72c757 F |
1736 | |
1737 | return 1; | |
1738 | } | |
9d75dce3 | 1739 | |
38b051a1 TM |
1740 | static int init_post_handshake_auth(SSL_CONNECTION *s, |
1741 | ossl_unused unsigned int context) | |
9d75dce3 TS |
1742 | { |
1743 | s->post_handshake_auth = SSL_PHA_NONE; | |
1744 | ||
1745 | return 1; | |
1746 | } | |
efe0f315 BK |
1747 | |
1748 | /* | |
1749 | * If clients offer "pre_shared_key" without a "psk_key_exchange_modes" | |
1750 | * extension, servers MUST abort the handshake. | |
1751 | */ | |
38b051a1 | 1752 | static int final_psk(SSL_CONNECTION *s, unsigned int context, int sent) |
efe0f315 BK |
1753 | { |
1754 | if (s->server && sent && s->clienthello != NULL | |
1755 | && !s->clienthello->pre_proc_exts[TLSEXT_IDX_psk_kex_modes].present) { | |
1756 | SSLfatal(s, TLS13_AD_MISSING_EXTENSION, | |
1757 | SSL_R_MISSING_PSK_KEX_MODES_EXTENSION); | |
1758 | return 0; | |
1759 | } | |
1760 | ||
1761 | return 1; | |
1762 | } | |
b67cb09f TS |
1763 | |
1764 | static int tls_init_compress_certificate(SSL_CONNECTION *sc, unsigned int context) | |
1765 | { | |
1766 | memset(sc->ext.compress_certificate_from_peer, 0, | |
1767 | sizeof(sc->ext.compress_certificate_from_peer)); | |
1768 | return 1; | |
1769 | } | |
1770 | ||
1771 | /* The order these are put into the packet imply a preference order: [brotli, zlib, zstd] */ | |
1772 | static EXT_RETURN tls_construct_compress_certificate(SSL_CONNECTION *sc, WPACKET *pkt, | |
1773 | unsigned int context, | |
1774 | X509 *x, size_t chainidx) | |
1775 | { | |
1776 | #ifndef OPENSSL_NO_COMP_ALG | |
1777 | int i; | |
1778 | ||
1779 | if (!ossl_comp_has_alg(0)) | |
1780 | return EXT_RETURN_NOT_SENT; | |
1781 | ||
1782 | /* Do not indicate we support receiving compressed certificates */ | |
1783 | if ((sc->options & SSL_OP_NO_RX_CERTIFICATE_COMPRESSION) != 0) | |
1784 | return EXT_RETURN_NOT_SENT; | |
1785 | ||
1786 | if (sc->cert_comp_prefs[0] == TLSEXT_comp_cert_none) | |
1787 | return EXT_RETURN_NOT_SENT; | |
1788 | ||
1789 | if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_compress_certificate) | |
1790 | || !WPACKET_start_sub_packet_u16(pkt) | |
1791 | || !WPACKET_start_sub_packet_u8(pkt)) | |
1792 | goto err; | |
1793 | ||
1794 | for (i = 0; sc->cert_comp_prefs[i] != TLSEXT_comp_cert_none; i++) { | |
1795 | if (!WPACKET_put_bytes_u16(pkt, sc->cert_comp_prefs[i])) | |
1796 | goto err; | |
1797 | } | |
1798 | if (!WPACKET_close(pkt) || !WPACKET_close(pkt)) | |
1799 | goto err; | |
1800 | ||
1801 | sc->ext.compress_certificate_sent = 1; | |
1802 | return EXT_RETURN_SENT; | |
1803 | err: | |
1804 | SSLfatal(sc, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); | |
1805 | return EXT_RETURN_FAIL; | |
1806 | #else | |
1807 | return EXT_RETURN_NOT_SENT; | |
1808 | #endif | |
1809 | } | |
1810 | ||
1811 | #ifndef OPENSSL_NO_COMP_ALG | |
1812 | static int tls_comp_in_pref(SSL_CONNECTION *sc, int alg) | |
1813 | { | |
1814 | int i; | |
1815 | ||
1816 | /* ossl_comp_has_alg() considers 0 as "any" */ | |
1817 | if (alg == 0) | |
1818 | return 0; | |
1819 | /* Make sure algorithm is enabled */ | |
1820 | if (!ossl_comp_has_alg(alg)) | |
1821 | return 0; | |
1822 | /* If no preferences are set, it's ok */ | |
1823 | if (sc->cert_comp_prefs[0] == TLSEXT_comp_cert_none) | |
1824 | return 1; | |
1825 | /* Find the algorithm */ | |
1826 | for (i = 0; i < TLSEXT_comp_cert_limit; i++) | |
1827 | if (sc->cert_comp_prefs[i] == alg) | |
1828 | return 1; | |
1829 | return 0; | |
1830 | } | |
1831 | #endif | |
1832 | ||
1833 | int tls_parse_compress_certificate(SSL_CONNECTION *sc, PACKET *pkt, unsigned int context, | |
1834 | X509 *x, size_t chainidx) | |
1835 | { | |
1836 | #ifndef OPENSSL_NO_COMP_ALG | |
1837 | PACKET supported_comp_algs; | |
1838 | unsigned int comp; | |
1839 | int already_set[TLSEXT_comp_cert_limit]; | |
1840 | int j = 0; | |
1841 | ||
1842 | /* If no algorithms are available, ignore the extension */ | |
1843 | if (!ossl_comp_has_alg(0)) | |
1844 | return 1; | |
1845 | ||
1846 | /* Ignore the extension and don't send compressed certificates */ | |
1847 | if ((sc->options & SSL_OP_NO_TX_CERTIFICATE_COMPRESSION) != 0) | |
1848 | return 1; | |
1849 | ||
1850 | if (!PACKET_as_length_prefixed_1(pkt, &supported_comp_algs) | |
1851 | || PACKET_remaining(&supported_comp_algs) == 0) { | |
1852 | SSLfatal(sc, SSL_AD_DECODE_ERROR, SSL_R_BAD_EXTENSION); | |
1853 | return 0; | |
1854 | } | |
1855 | ||
1856 | memset(already_set, 0, sizeof(already_set)); | |
1857 | /* | |
1858 | * The preference array has real values, so take a look at each | |
1859 | * value coming in, and make sure it's in our preference list | |
1860 | * The array is 0 (i.e. "none") terminated | |
1861 | * The preference list only contains supported algorithms | |
1862 | */ | |
ce74e3fb | 1863 | while (PACKET_get_net_2(&supported_comp_algs, &comp)) { |
b67cb09f TS |
1864 | if (tls_comp_in_pref(sc, comp) && !already_set[comp]) { |
1865 | sc->ext.compress_certificate_from_peer[j++] = comp; | |
1866 | already_set[comp] = 1; | |
1867 | } | |
1868 | } | |
1869 | #endif | |
1870 | return 1; | |
1871 | } |