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6b473aca | 1 | /* |
4333b89f | 2 | * Copyright 2016-2021 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 | ||
f6370040 | 10 | #include <string.h> |
677963e5 | 11 | #include "internal/nelem.h" |
88050dd1 | 12 | #include "internal/cryptlib.h" |
706457b7 DMSP |
13 | #include "../ssl_local.h" |
14 | #include "statem_local.h" | |
c36001c3 | 15 | #include "internal/cryptlib.h" |
6b473aca | 16 | |
f63a17d6 | 17 | static int final_renegotiate(SSL *s, unsigned int context, int sent); |
1266eefd | 18 | static int init_server_name(SSL *s, unsigned int context); |
f63a17d6 | 19 | static int final_server_name(SSL *s, unsigned int context, int sent); |
332eb390 | 20 | #ifndef OPENSSL_NO_EC |
f63a17d6 | 21 | static int final_ec_pt_formats(SSL *s, unsigned int context, int sent); |
332eb390 | 22 | #endif |
1266eefd | 23 | static int init_session_ticket(SSL *s, unsigned int context); |
8f8c11d8 | 24 | #ifndef OPENSSL_NO_OCSP |
1266eefd | 25 | static int init_status_request(SSL *s, unsigned int context); |
8f8c11d8 | 26 | #endif |
805a2e9e | 27 | #ifndef OPENSSL_NO_NEXTPROTONEG |
1266eefd | 28 | static int init_npn(SSL *s, unsigned int context); |
805a2e9e | 29 | #endif |
1266eefd | 30 | static int init_alpn(SSL *s, unsigned int context); |
f63a17d6 | 31 | static int final_alpn(SSL *s, unsigned int context, int sent); |
c589c34e | 32 | static int init_sig_algs_cert(SSL *s, unsigned int context); |
1266eefd | 33 | static int init_sig_algs(SSL *s, unsigned int context); |
45615c5f | 34 | static int init_certificate_authorities(SSL *s, unsigned int context); |
b186a592 MC |
35 | static EXT_RETURN tls_construct_certificate_authorities(SSL *s, WPACKET *pkt, |
36 | unsigned int context, | |
37 | X509 *x, | |
f63a17d6 | 38 | size_t chainidx); |
45615c5f DSH |
39 | static int tls_parse_certificate_authorities(SSL *s, PACKET *pkt, |
40 | unsigned int context, X509 *x, | |
f63a17d6 | 41 | size_t chainidx); |
805a2e9e | 42 | #ifndef OPENSSL_NO_SRP |
1266eefd | 43 | static int init_srp(SSL *s, unsigned int context); |
805a2e9e | 44 | #endif |
1266eefd MC |
45 | static int init_etm(SSL *s, unsigned int context); |
46 | static int init_ems(SSL *s, unsigned int context); | |
f63a17d6 | 47 | static int final_ems(SSL *s, unsigned int context, int sent); |
b2f7e8c0 | 48 | static int init_psk_kex_modes(SSL *s, unsigned int context); |
f63a17d6 | 49 | static int final_key_share(SSL *s, unsigned int context, int sent); |
805a2e9e | 50 | #ifndef OPENSSL_NO_SRTP |
1266eefd | 51 | static int init_srtp(SSL *s, unsigned int context); |
805a2e9e | 52 | #endif |
f63a17d6 MC |
53 | static int final_sig_algs(SSL *s, unsigned int context, int sent); |
54 | static int final_early_data(SSL *s, unsigned int context, int sent); | |
55 | static int final_maxfragmentlen(SSL *s, unsigned int context, int sent); | |
9d75dce3 TS |
56 | static int init_post_handshake_auth(SSL *s, unsigned int context); |
57 | ||
70af3d8e | 58 | /* Structure to define a built-in extension */ |
1266eefd MC |
59 | typedef struct extensions_definition_st { |
60 | /* The defined type for the extension */ | |
6b473aca | 61 | unsigned int type; |
1266eefd MC |
62 | /* |
63 | * The context that this extension applies to, e.g. what messages and | |
64 | * protocol versions | |
65 | */ | |
66 | unsigned int context; | |
68db4dda | 67 | /* |
805a2e9e MC |
68 | * Initialise extension before parsing. Always called for relevant contexts |
69 | * even if extension not present | |
68db4dda | 70 | */ |
1266eefd MC |
71 | int (*init)(SSL *s, unsigned int context); |
72 | /* Parse extension sent from client to server */ | |
61138358 | 73 | int (*parse_ctos)(SSL *s, PACKET *pkt, unsigned int context, X509 *x, |
f63a17d6 | 74 | size_t chainidx); |
1266eefd | 75 | /* Parse extension send from server to client */ |
61138358 | 76 | int (*parse_stoc)(SSL *s, PACKET *pkt, unsigned int context, X509 *x, |
f63a17d6 | 77 | size_t chainidx); |
1266eefd | 78 | /* Construct extension sent from server to client */ |
b186a592 | 79 | EXT_RETURN (*construct_stoc)(SSL *s, WPACKET *pkt, unsigned int context, |
f63a17d6 | 80 | X509 *x, size_t chainidx); |
1266eefd | 81 | /* Construct extension sent from client to server */ |
b186a592 | 82 | EXT_RETURN (*construct_ctos)(SSL *s, WPACKET *pkt, unsigned int context, |
f63a17d6 | 83 | X509 *x, size_t chainidx); |
68db4dda | 84 | /* |
805a2e9e MC |
85 | * Finalise extension after parsing. Always called where an extensions was |
86 | * initialised even if the extension was not present. |sent| is set to 1 if | |
87 | * the extension was seen, or 0 otherwise. | |
68db4dda | 88 | */ |
f63a17d6 | 89 | int (*final)(SSL *s, unsigned int context, int sent); |
6b473aca MC |
90 | } EXTENSION_DEFINITION; |
91 | ||
4b299b8e | 92 | /* |
70af3d8e | 93 | * Definitions of all built-in extensions. NOTE: Changes in the number or order |
bd91e3c8 | 94 | * of these extensions should be mirrored with equivalent changes to the |
706457b7 | 95 | * indexes ( TLSEXT_IDX_* ) defined in ssl_local.h. |
70af3d8e MC |
96 | * Each extension has an initialiser, a client and |
97 | * server side parser and a finaliser. The initialiser is called (if the | |
98 | * extension is relevant to the given context) even if we did not see the | |
99 | * extension in the message that we received. The parser functions are only | |
100 | * called if we see the extension in the message. The finalisers are always | |
101 | * called if the initialiser was called. | |
102 | * There are also server and client side constructor functions which are always | |
103 | * called during message construction if the extension is relevant for the | |
104 | * given context. | |
105 | * The initialisation, parsing, finalisation and construction functions are | |
106 | * always called in the order defined in this list. Some extensions may depend | |
107 | * on others having been processed first, so the order of this list is | |
108 | * significant. | |
109 | * The extension context is defined by a series of flags which specify which | |
110 | * messages the extension is relevant to. These flags also specify whether the | |
3e6c1da8 | 111 | * extension is relevant to a particular protocol or protocol version. |
a1448c26 | 112 | * |
70af3d8e | 113 | * TODO(TLS1.3): Make sure we have a test to check the consistency of these |
10ed1b72 TS |
114 | * |
115 | * NOTE: WebSphere Application Server 7+ cannot handle empty extensions at | |
116 | * the end, keep these extensions before signature_algorithm. | |
4b299b8e | 117 | */ |
0785274c | 118 | #define INVALID_EXTENSION { 0x10000, 0, NULL, NULL, NULL, NULL, NULL, NULL } |
6b473aca MC |
119 | static const EXTENSION_DEFINITION ext_defs[] = { |
120 | { | |
121 | TLSEXT_TYPE_renegotiate, | |
fe874d27 MC |
122 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO |
123 | | SSL_EXT_SSL3_ALLOWED | SSL_EXT_TLS1_2_AND_BELOW_ONLY, | |
1266eefd MC |
124 | NULL, tls_parse_ctos_renegotiate, tls_parse_stoc_renegotiate, |
125 | tls_construct_stoc_renegotiate, tls_construct_ctos_renegotiate, | |
126 | final_renegotiate | |
6b473aca MC |
127 | }, |
128 | { | |
129 | TLSEXT_TYPE_server_name, | |
fe874d27 MC |
130 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO |
131 | | SSL_EXT_TLS1_3_ENCRYPTED_EXTENSIONS, | |
1266eefd MC |
132 | init_server_name, |
133 | tls_parse_ctos_server_name, tls_parse_stoc_server_name, | |
134 | tls_construct_stoc_server_name, tls_construct_ctos_server_name, | |
135 | final_server_name | |
6b473aca | 136 | }, |
cf72c757 F |
137 | { |
138 | TLSEXT_TYPE_max_fragment_length, | |
139 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO | |
140 | | SSL_EXT_TLS1_3_ENCRYPTED_EXTENSIONS, | |
141 | NULL, tls_parse_ctos_maxfragmentlen, tls_parse_stoc_maxfragmentlen, | |
142 | tls_construct_stoc_maxfragmentlen, tls_construct_ctos_maxfragmentlen, | |
143 | final_maxfragmentlen | |
144 | }, | |
6b473aca MC |
145 | #ifndef OPENSSL_NO_SRP |
146 | { | |
147 | TLSEXT_TYPE_srp, | |
fe874d27 | 148 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_AND_BELOW_ONLY, |
1266eefd | 149 | init_srp, tls_parse_ctos_srp, NULL, NULL, tls_construct_ctos_srp, NULL |
6b473aca | 150 | }, |
0785274c MC |
151 | #else |
152 | INVALID_EXTENSION, | |
6b473aca MC |
153 | #endif |
154 | #ifndef OPENSSL_NO_EC | |
155 | { | |
156 | TLSEXT_TYPE_ec_point_formats, | |
fe874d27 MC |
157 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO |
158 | | SSL_EXT_TLS1_2_AND_BELOW_ONLY, | |
1266eefd MC |
159 | NULL, tls_parse_ctos_ec_pt_formats, tls_parse_stoc_ec_pt_formats, |
160 | tls_construct_stoc_ec_pt_formats, tls_construct_ctos_ec_pt_formats, | |
161 | final_ec_pt_formats | |
6b473aca | 162 | }, |
dbc6268f MC |
163 | #else |
164 | INVALID_EXTENSION, | |
165 | #endif | |
166 | #if !defined(OPENSSL_NO_EC) || !defined(OPENSSL_NO_DH) | |
6b473aca | 167 | { |
7bc2bddb BK |
168 | /* |
169 | * "supported_groups" is spread across several specifications. | |
170 | * It was originally specified as "elliptic_curves" in RFC 4492, | |
171 | * and broadened to include named FFDH groups by RFC 7919. | |
172 | * Both RFCs 4492 and 7919 do not include a provision for the server | |
173 | * to indicate to the client the complete list of groups supported | |
174 | * by the server, with the server instead just indicating the | |
175 | * selected group for this connection in the ServerKeyExchange | |
176 | * message. TLS 1.3 adds a scheme for the server to indicate | |
177 | * to the client its list of supported groups in the | |
178 | * EncryptedExtensions message, but none of the relevant | |
179 | * specifications permit sending supported_groups in the ServerHello. | |
180 | * Nonetheless (possibly due to the close proximity to the | |
181 | * "ec_point_formats" extension, which is allowed in the ServerHello), | |
182 | * there are several servers that send this extension in the | |
183 | * ServerHello anyway. Up to and including the 1.1.0 release, | |
184 | * we did not check for the presence of nonpermitted extensions, | |
185 | * so to avoid a regression, we must permit this extension in the | |
186 | * TLS 1.2 ServerHello as well. | |
187 | * | |
188 | * Note that there is no tls_parse_stoc_supported_groups function, | |
189 | * so we do not perform any additional parsing, validation, or | |
190 | * processing on the server's group list -- this is just a minimal | |
191 | * change to preserve compatibility with these misbehaving servers. | |
192 | */ | |
6b473aca | 193 | TLSEXT_TYPE_supported_groups, |
7bc2bddb BK |
194 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_3_ENCRYPTED_EXTENSIONS |
195 | | SSL_EXT_TLS1_2_SERVER_HELLO, | |
1266eefd | 196 | NULL, tls_parse_ctos_supported_groups, NULL, |
6af87546 | 197 | tls_construct_stoc_supported_groups, |
1266eefd | 198 | tls_construct_ctos_supported_groups, NULL |
6b473aca | 199 | }, |
0785274c MC |
200 | #else |
201 | INVALID_EXTENSION, | |
6b473aca MC |
202 | #endif |
203 | { | |
204 | TLSEXT_TYPE_session_ticket, | |
fe874d27 MC |
205 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO |
206 | | SSL_EXT_TLS1_2_AND_BELOW_ONLY, | |
1266eefd MC |
207 | init_session_ticket, tls_parse_ctos_session_ticket, |
208 | tls_parse_stoc_session_ticket, tls_construct_stoc_session_ticket, | |
209 | tls_construct_ctos_session_ticket, NULL | |
6b473aca | 210 | }, |
ab83e314 | 211 | #ifndef OPENSSL_NO_OCSP |
6b473aca MC |
212 | { |
213 | TLSEXT_TYPE_status_request, | |
fe874d27 | 214 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO |
5de683d2 | 215 | | SSL_EXT_TLS1_3_CERTIFICATE | SSL_EXT_TLS1_3_CERTIFICATE_REQUEST, |
1266eefd MC |
216 | init_status_request, tls_parse_ctos_status_request, |
217 | tls_parse_stoc_status_request, tls_construct_stoc_status_request, | |
f63e4288 | 218 | tls_construct_ctos_status_request, NULL |
6b473aca | 219 | }, |
0785274c MC |
220 | #else |
221 | INVALID_EXTENSION, | |
ab83e314 | 222 | #endif |
6b473aca MC |
223 | #ifndef OPENSSL_NO_NEXTPROTONEG |
224 | { | |
225 | TLSEXT_TYPE_next_proto_neg, | |
fe874d27 MC |
226 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO |
227 | | SSL_EXT_TLS1_2_AND_BELOW_ONLY, | |
1266eefd MC |
228 | init_npn, tls_parse_ctos_npn, tls_parse_stoc_npn, |
229 | tls_construct_stoc_next_proto_neg, tls_construct_ctos_npn, NULL | |
6b473aca | 230 | }, |
0785274c MC |
231 | #else |
232 | INVALID_EXTENSION, | |
6b473aca MC |
233 | #endif |
234 | { | |
02f0274e MC |
235 | /* |
236 | * Must appear in this list after server_name so that finalisation | |
237 | * happens after server_name callbacks | |
238 | */ | |
6b473aca | 239 | TLSEXT_TYPE_application_layer_protocol_negotiation, |
fe874d27 MC |
240 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO |
241 | | SSL_EXT_TLS1_3_ENCRYPTED_EXTENSIONS, | |
1266eefd | 242 | init_alpn, tls_parse_ctos_alpn, tls_parse_stoc_alpn, |
630369d9 | 243 | tls_construct_stoc_alpn, tls_construct_ctos_alpn, final_alpn |
6b473aca | 244 | }, |
7da160b0 | 245 | #ifndef OPENSSL_NO_SRTP |
6b473aca MC |
246 | { |
247 | TLSEXT_TYPE_use_srtp, | |
fe874d27 MC |
248 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO |
249 | | SSL_EXT_TLS1_3_ENCRYPTED_EXTENSIONS | SSL_EXT_DTLS_ONLY, | |
1266eefd MC |
250 | init_srtp, tls_parse_ctos_use_srtp, tls_parse_stoc_use_srtp, |
251 | tls_construct_stoc_use_srtp, tls_construct_ctos_use_srtp, NULL | |
6b473aca | 252 | }, |
0785274c MC |
253 | #else |
254 | INVALID_EXTENSION, | |
7da160b0 | 255 | #endif |
6b473aca MC |
256 | { |
257 | TLSEXT_TYPE_encrypt_then_mac, | |
fe874d27 MC |
258 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO |
259 | | SSL_EXT_TLS1_2_AND_BELOW_ONLY, | |
1266eefd MC |
260 | init_etm, tls_parse_ctos_etm, tls_parse_stoc_etm, |
261 | tls_construct_stoc_etm, tls_construct_ctos_etm, NULL | |
6b473aca | 262 | }, |
6dd083fd | 263 | #ifndef OPENSSL_NO_CT |
6b473aca MC |
264 | { |
265 | TLSEXT_TYPE_signed_certificate_timestamp, | |
fe874d27 | 266 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO |
5de683d2 | 267 | | SSL_EXT_TLS1_3_CERTIFICATE | SSL_EXT_TLS1_3_CERTIFICATE_REQUEST, |
68db4dda | 268 | NULL, |
6b473aca MC |
269 | /* |
270 | * No server side support for this, but can be provided by a custom | |
271 | * extension. This is an exception to the rule that custom extensions | |
272 | * cannot override built in ones. | |
273 | */ | |
1266eefd | 274 | NULL, tls_parse_stoc_sct, NULL, tls_construct_ctos_sct, NULL |
6b473aca | 275 | }, |
0785274c MC |
276 | #else |
277 | INVALID_EXTENSION, | |
6dd083fd | 278 | #endif |
6b473aca MC |
279 | { |
280 | TLSEXT_TYPE_extended_master_secret, | |
fe874d27 MC |
281 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO |
282 | | SSL_EXT_TLS1_2_AND_BELOW_ONLY, | |
1266eefd MC |
283 | init_ems, tls_parse_ctos_ems, tls_parse_stoc_ems, |
284 | tls_construct_stoc_ems, tls_construct_ctos_ems, final_ems | |
6b473aca | 285 | }, |
c589c34e BK |
286 | { |
287 | TLSEXT_TYPE_signature_algorithms_cert, | |
288 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_3_CERTIFICATE_REQUEST, | |
289 | init_sig_algs_cert, tls_parse_ctos_sig_algs_cert, | |
290 | tls_parse_ctos_sig_algs_cert, | |
291 | /* We do not generate signature_algorithms_cert at present. */ | |
292 | NULL, NULL, NULL | |
293 | }, | |
9d75dce3 TS |
294 | { |
295 | TLSEXT_TYPE_post_handshake_auth, | |
296 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_3_ONLY, | |
297 | init_post_handshake_auth, | |
298 | tls_parse_ctos_post_handshake_auth, NULL, | |
299 | NULL, tls_construct_ctos_post_handshake_auth, | |
300 | NULL, | |
301 | }, | |
10ed1b72 TS |
302 | { |
303 | TLSEXT_TYPE_signature_algorithms, | |
304 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_3_CERTIFICATE_REQUEST, | |
305 | init_sig_algs, tls_parse_ctos_sig_algs, | |
306 | tls_parse_ctos_sig_algs, tls_construct_ctos_sig_algs, | |
307 | tls_construct_ctos_sig_algs, final_sig_algs | |
308 | }, | |
6b473aca MC |
309 | { |
310 | TLSEXT_TYPE_supported_versions, | |
27e462f1 MC |
311 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_3_SERVER_HELLO |
312 | | SSL_EXT_TLS1_3_HELLO_RETRY_REQUEST | SSL_EXT_TLS_IMPLEMENTATION_ONLY, | |
68db4dda | 313 | NULL, |
6b473aca | 314 | /* Processed inline as part of version selection */ |
88050dd1 MC |
315 | NULL, tls_parse_stoc_supported_versions, |
316 | tls_construct_stoc_supported_versions, | |
317 | tls_construct_ctos_supported_versions, NULL | |
6b473aca | 318 | }, |
b2f7e8c0 | 319 | { |
b2f7e8c0 | 320 | TLSEXT_TYPE_psk_kex_modes, |
fe874d27 MC |
321 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS_IMPLEMENTATION_ONLY |
322 | | SSL_EXT_TLS1_3_ONLY, | |
b2f7e8c0 MC |
323 | init_psk_kex_modes, tls_parse_ctos_psk_kex_modes, NULL, NULL, |
324 | tls_construct_ctos_psk_kex_modes, NULL | |
325 | }, | |
6b473aca | 326 | { |
70af3d8e MC |
327 | /* |
328 | * Must be in this list after supported_groups. We need that to have | |
329 | * been parsed before we do this one. | |
330 | */ | |
6b473aca | 331 | TLSEXT_TYPE_key_share, |
fe874d27 MC |
332 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_3_SERVER_HELLO |
333 | | SSL_EXT_TLS1_3_HELLO_RETRY_REQUEST | SSL_EXT_TLS_IMPLEMENTATION_ONLY | |
334 | | SSL_EXT_TLS1_3_ONLY, | |
1266eefd | 335 | NULL, tls_parse_ctos_key_share, tls_parse_stoc_key_share, |
f4bbb37c MC |
336 | tls_construct_stoc_key_share, tls_construct_ctos_key_share, |
337 | final_key_share | |
7da160b0 | 338 | }, |
cfef5027 | 339 | { |
97ea1e7f | 340 | /* Must be after key_share */ |
cfef5027 | 341 | TLSEXT_TYPE_cookie, |
fe874d27 MC |
342 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_3_HELLO_RETRY_REQUEST |
343 | | SSL_EXT_TLS_IMPLEMENTATION_ONLY | SSL_EXT_TLS1_3_ONLY, | |
43054d3d MC |
344 | NULL, tls_parse_ctos_cookie, tls_parse_stoc_cookie, |
345 | tls_construct_stoc_cookie, tls_construct_ctos_cookie, NULL | |
cfef5027 | 346 | }, |
7da160b0 MC |
347 | { |
348 | /* | |
349 | * Special unsolicited ServerHello extension only used when | |
23fed8ba MC |
350 | * SSL_OP_CRYPTOPRO_TLSEXT_BUG is set. We allow it in a ClientHello but |
351 | * ignore it. | |
7da160b0 MC |
352 | */ |
353 | TLSEXT_TYPE_cryptopro_bug, | |
23fed8ba MC |
354 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO |
355 | | SSL_EXT_TLS1_2_AND_BELOW_ONLY, | |
1266eefd | 356 | NULL, NULL, NULL, tls_construct_stoc_cryptopro_bug, NULL, NULL |
ab83e314 | 357 | }, |
38df5a45 MC |
358 | { |
359 | TLSEXT_TYPE_early_data, | |
fe874d27 | 360 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_3_ENCRYPTED_EXTENSIONS |
6e99ae58 | 361 | | SSL_EXT_TLS1_3_NEW_SESSION_TICKET | SSL_EXT_TLS1_3_ONLY, |
38df5a45 MC |
362 | NULL, tls_parse_ctos_early_data, tls_parse_stoc_early_data, |
363 | tls_construct_stoc_early_data, tls_construct_ctos_early_data, | |
364 | final_early_data | |
365 | }, | |
45615c5f DSH |
366 | { |
367 | TLSEXT_TYPE_certificate_authorities, | |
fe874d27 MC |
368 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_3_CERTIFICATE_REQUEST |
369 | | SSL_EXT_TLS1_3_ONLY, | |
45615c5f DSH |
370 | init_certificate_authorities, |
371 | tls_parse_certificate_authorities, tls_parse_certificate_authorities, | |
372 | tls_construct_certificate_authorities, | |
373 | tls_construct_certificate_authorities, NULL, | |
374 | }, | |
ab83e314 | 375 | { |
ec15acb6 | 376 | /* Must be immediately before pre_shared_key */ |
ab83e314 | 377 | TLSEXT_TYPE_padding, |
fe874d27 | 378 | SSL_EXT_CLIENT_HELLO, |
68db4dda | 379 | NULL, |
ab83e314 | 380 | /* We send this, but don't read it */ |
1266eefd | 381 | NULL, NULL, NULL, tls_construct_ctos_padding, NULL |
ec15acb6 MC |
382 | }, |
383 | { | |
384 | /* Required by the TLSv1.3 spec to always be the last extension */ | |
385 | TLSEXT_TYPE_psk, | |
fe874d27 MC |
386 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_3_SERVER_HELLO |
387 | | SSL_EXT_TLS_IMPLEMENTATION_ONLY | SSL_EXT_TLS1_3_ONLY, | |
0247086d | 388 | NULL, tls_parse_ctos_psk, tls_parse_stoc_psk, tls_construct_stoc_psk, |
1053a6e2 | 389 | tls_construct_ctos_psk, NULL |
6b473aca MC |
390 | } |
391 | }; | |
392 | ||
43ae5eed MC |
393 | /* Check whether an extension's context matches the current context */ |
394 | static int validate_context(SSL *s, unsigned int extctx, unsigned int thisctx) | |
395 | { | |
396 | /* Check we're allowed to use this extension in this context */ | |
397 | if ((thisctx & extctx) == 0) | |
398 | return 0; | |
399 | ||
400 | if (SSL_IS_DTLS(s)) { | |
401 | if ((extctx & SSL_EXT_TLS_ONLY) != 0) | |
402 | return 0; | |
403 | } else if ((extctx & SSL_EXT_DTLS_ONLY) != 0) { | |
404 | return 0; | |
405 | } | |
406 | ||
407 | return 1; | |
408 | } | |
409 | ||
88050dd1 MC |
410 | int tls_validate_all_contexts(SSL *s, unsigned int thisctx, RAW_EXTENSION *exts) |
411 | { | |
412 | size_t i, num_exts, builtin_num = OSSL_NELEM(ext_defs), offset; | |
413 | RAW_EXTENSION *thisext; | |
414 | unsigned int context; | |
415 | ENDPOINT role = ENDPOINT_BOTH; | |
416 | ||
417 | if ((thisctx & SSL_EXT_CLIENT_HELLO) != 0) | |
418 | role = ENDPOINT_SERVER; | |
419 | else if ((thisctx & SSL_EXT_TLS1_2_SERVER_HELLO) != 0) | |
420 | role = ENDPOINT_CLIENT; | |
421 | ||
422 | /* Calculate the number of extensions in the extensions list */ | |
423 | num_exts = builtin_num + s->cert->custext.meths_count; | |
424 | ||
425 | for (thisext = exts, i = 0; i < num_exts; i++, thisext++) { | |
426 | if (!thisext->present) | |
427 | continue; | |
428 | ||
429 | if (i < builtin_num) { | |
430 | context = ext_defs[i].context; | |
431 | } else { | |
432 | custom_ext_method *meth = NULL; | |
433 | ||
434 | meth = custom_ext_find(&s->cert->custext, role, thisext->type, | |
435 | &offset); | |
436 | if (!ossl_assert(meth != NULL)) | |
437 | return 0; | |
438 | context = meth->context; | |
439 | } | |
440 | ||
441 | if (!validate_context(s, context, thisctx)) | |
442 | return 0; | |
443 | } | |
444 | ||
445 | return 1; | |
446 | } | |
447 | ||
6b473aca MC |
448 | /* |
449 | * Verify whether we are allowed to use the extension |type| in the current | |
450 | * |context|. Returns 1 to indicate the extension is allowed or unknown or 0 to | |
70af3d8e | 451 | * indicate the extension is not allowed. If returning 1 then |*found| is set to |
69687aa8 | 452 | * the definition for the extension we found. |
6b473aca | 453 | */ |
70af3d8e | 454 | static int verify_extension(SSL *s, unsigned int context, unsigned int type, |
1266eefd MC |
455 | custom_ext_methods *meths, RAW_EXTENSION *rawexlist, |
456 | RAW_EXTENSION **found) | |
6b473aca MC |
457 | { |
458 | size_t i; | |
70af3d8e | 459 | size_t builtin_num = OSSL_NELEM(ext_defs); |
d270de32 | 460 | const EXTENSION_DEFINITION *thisext; |
6b473aca | 461 | |
1266eefd MC |
462 | for (i = 0, thisext = ext_defs; i < builtin_num; i++, thisext++) { |
463 | if (type == thisext->type) { | |
43ae5eed | 464 | if (!validate_context(s, thisext->context, context)) |
6b473aca MC |
465 | return 0; |
466 | ||
1266eefd | 467 | *found = &rawexlist[i]; |
6b473aca MC |
468 | return 1; |
469 | } | |
470 | } | |
471 | ||
70af3d8e MC |
472 | /* Check the custom extensions */ |
473 | if (meths != NULL) { | |
43ae5eed | 474 | size_t offset = 0; |
787d9ec7 | 475 | ENDPOINT role = ENDPOINT_BOTH; |
43ae5eed MC |
476 | custom_ext_method *meth = NULL; |
477 | ||
478 | if ((context & SSL_EXT_CLIENT_HELLO) != 0) | |
787d9ec7 | 479 | role = ENDPOINT_SERVER; |
43ae5eed | 480 | else if ((context & SSL_EXT_TLS1_2_SERVER_HELLO) != 0) |
787d9ec7 | 481 | role = ENDPOINT_CLIENT; |
43ae5eed | 482 | |
787d9ec7 | 483 | meth = custom_ext_find(meths, role, type, &offset); |
43ae5eed MC |
484 | if (meth != NULL) { |
485 | if (!validate_context(s, meth->context, context)) | |
486 | return 0; | |
487 | *found = &rawexlist[offset + builtin_num]; | |
488 | return 1; | |
6b473aca MC |
489 | } |
490 | } | |
491 | ||
70af3d8e | 492 | /* Unknown extension. We allow it */ |
1266eefd | 493 | *found = NULL; |
70af3d8e | 494 | return 1; |
6b473aca MC |
495 | } |
496 | ||
70af3d8e MC |
497 | /* |
498 | * Check whether the context defined for an extension |extctx| means whether | |
499 | * the extension is relevant for the current context |thisctx| or not. Returns | |
500 | * 1 if the extension is relevant for this context, and 0 otherwise | |
501 | */ | |
43ae5eed | 502 | int extension_is_relevant(SSL *s, unsigned int extctx, unsigned int thisctx) |
805a2e9e | 503 | { |
a2b97bdf MC |
504 | int is_tls13; |
505 | ||
506 | /* | |
507 | * For HRR we haven't selected the version yet but we know it will be | |
508 | * TLSv1.3 | |
509 | */ | |
510 | if ((thisctx & SSL_EXT_TLS1_3_HELLO_RETRY_REQUEST) != 0) | |
511 | is_tls13 = 1; | |
512 | else | |
513 | is_tls13 = SSL_IS_TLS13(s); | |
514 | ||
805a2e9e | 515 | if ((SSL_IS_DTLS(s) |
fe874d27 | 516 | && (extctx & SSL_EXT_TLS_IMPLEMENTATION_ONLY) != 0) |
805a2e9e | 517 | || (s->version == SSL3_VERSION |
fe874d27 | 518 | && (extctx & SSL_EXT_SSL3_ALLOWED) == 0) |
ee36b963 BK |
519 | /* |
520 | * Note that SSL_IS_TLS13() means "TLS 1.3 has been negotiated", | |
521 | * which is never true when generating the ClientHello. | |
522 | * However, version negotiation *has* occurred by the time the | |
523 | * ClientHello extensions are being parsed. | |
524 | * Be careful to allow TLS 1.3-only extensions when generating | |
525 | * the ClientHello. | |
526 | */ | |
a2b97bdf | 527 | || (is_tls13 && (extctx & SSL_EXT_TLS1_2_AND_BELOW_ONLY) != 0) |
ee36b963 BK |
528 | || (!is_tls13 && (extctx & SSL_EXT_TLS1_3_ONLY) != 0 |
529 | && (thisctx & SSL_EXT_CLIENT_HELLO) == 0) | |
530 | || (s->server && !is_tls13 && (extctx & SSL_EXT_TLS1_3_ONLY) != 0) | |
43ae5eed | 531 | || (s->hit && (extctx & SSL_EXT_IGNORE_ON_RESUMPTION) != 0)) |
805a2e9e | 532 | return 0; |
805a2e9e MC |
533 | return 1; |
534 | } | |
535 | ||
6b473aca MC |
536 | /* |
537 | * Gather a list of all the extensions from the data in |packet]. |context| | |
70af3d8e | 538 | * tells us which message this extension is for. The raw extension data is |
29bfd5b7 MC |
539 | * stored in |*res| on success. We don't actually process the content of the |
540 | * extensions yet, except to check their types. This function also runs the | |
541 | * initialiser functions for all known extensions if |init| is nonzero (whether | |
542 | * we have collected them or not). If successful the caller is responsible for | |
543 | * freeing the contents of |*res|. | |
6b473aca MC |
544 | * |
545 | * Per http://tools.ietf.org/html/rfc5246#section-7.4.1.4, there may not be | |
546 | * more than one extension of the same type in a ClientHello or ServerHello. | |
547 | * This function returns 1 if all extensions are unique and we have parsed their | |
548 | * types, and 0 if the extensions contain duplicates, could not be successfully | |
1266eefd | 549 | * found, or an internal error occurred. We only check duplicates for |
70af3d8e | 550 | * extensions that we know about. We ignore others. |
6b473aca | 551 | */ |
6b473aca | 552 | int tls_collect_extensions(SSL *s, PACKET *packet, unsigned int context, |
f63a17d6 | 553 | RAW_EXTENSION **res, size_t *len, int init) |
6b473aca MC |
554 | { |
555 | PACKET extensions = *packet; | |
d270de32 | 556 | size_t i = 0; |
fc5ece2e | 557 | size_t num_exts; |
43ae5eed | 558 | custom_ext_methods *exts = &s->cert->custext; |
6b473aca | 559 | RAW_EXTENSION *raw_extensions = NULL; |
d270de32 | 560 | const EXTENSION_DEFINITION *thisexd; |
6b473aca | 561 | |
ecc2f938 MC |
562 | *res = NULL; |
563 | ||
70af3d8e MC |
564 | /* |
565 | * Initialise server side custom extensions. Client side is done during | |
566 | * construction of extensions for the ClientHello. | |
567 | */ | |
43ae5eed MC |
568 | if ((context & SSL_EXT_CLIENT_HELLO) != 0) |
569 | custom_ext_init(&s->cert->custext); | |
70af3d8e | 570 | |
fc5ece2e BK |
571 | num_exts = OSSL_NELEM(ext_defs) + (exts != NULL ? exts->meths_count : 0); |
572 | raw_extensions = OPENSSL_zalloc(num_exts * sizeof(*raw_extensions)); | |
70af3d8e | 573 | if (raw_extensions == NULL) { |
c48ffbcc | 574 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_MALLOC_FAILURE); |
70af3d8e MC |
575 | return 0; |
576 | } | |
577 | ||
193b5d76 | 578 | i = 0; |
6b473aca | 579 | while (PACKET_remaining(&extensions) > 0) { |
b186a592 | 580 | unsigned int type, idx; |
6b473aca | 581 | PACKET extension; |
1266eefd | 582 | RAW_EXTENSION *thisex; |
6b473aca MC |
583 | |
584 | if (!PACKET_get_net_2(&extensions, &type) || | |
585 | !PACKET_get_length_prefixed_2(&extensions, &extension)) { | |
c48ffbcc | 586 | SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_R_BAD_EXTENSION); |
6b473aca MC |
587 | goto err; |
588 | } | |
70af3d8e MC |
589 | /* |
590 | * Verify this extension is allowed. We only check duplicates for | |
652a6b7e MC |
591 | * extensions that we recognise. We also have a special case for the |
592 | * PSK extension, which must be the last one in the ClientHello. | |
70af3d8e | 593 | */ |
1266eefd | 594 | if (!verify_extension(s, context, type, exts, raw_extensions, &thisex) |
652a6b7e MC |
595 | || (thisex != NULL && thisex->present == 1) |
596 | || (type == TLSEXT_TYPE_psk | |
fe874d27 | 597 | && (context & SSL_EXT_CLIENT_HELLO) != 0 |
652a6b7e | 598 | && PACKET_remaining(&extensions) != 0)) { |
c48ffbcc | 599 | SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_R_BAD_EXTENSION); |
6b473aca MC |
600 | goto err; |
601 | } | |
b186a592 MC |
602 | idx = thisex - raw_extensions; |
603 | /*- | |
604 | * Check that we requested this extension (if appropriate). Requests can | |
605 | * be sent in the ClientHello and CertificateRequest. Unsolicited | |
606 | * extensions can be sent in the NewSessionTicket. We only do this for | |
607 | * the built-in extensions. Custom extensions have a different but | |
608 | * similar check elsewhere. | |
609 | * Special cases: | |
610 | * - The HRR cookie extension is unsolicited | |
611 | * - The renegotiate extension is unsolicited (the client signals | |
612 | * support via an SCSV) | |
613 | * - The signed_certificate_timestamp extension can be provided by a | |
614 | * custom extension or by the built-in version. We let the extension | |
615 | * itself handle unsolicited response checks. | |
616 | */ | |
617 | if (idx < OSSL_NELEM(ext_defs) | |
618 | && (context & (SSL_EXT_CLIENT_HELLO | |
619 | | SSL_EXT_TLS1_3_CERTIFICATE_REQUEST | |
620 | | SSL_EXT_TLS1_3_NEW_SESSION_TICKET)) == 0 | |
621 | && type != TLSEXT_TYPE_cookie | |
622 | && type != TLSEXT_TYPE_renegotiate | |
623 | && type != TLSEXT_TYPE_signed_certificate_timestamp | |
673e0bbb DB |
624 | && (s->ext.extflags[idx] & SSL_EXT_FLAG_SENT) == 0 |
625 | #ifndef OPENSSL_NO_GOST | |
626 | && !((context & SSL_EXT_TLS1_2_SERVER_HELLO) != 0 | |
627 | && type == TLSEXT_TYPE_cryptopro_bug) | |
628 | #endif | |
dd6b2706 | 629 | ) { |
f63a17d6 | 630 | SSLfatal(s, SSL_AD_UNSUPPORTED_EXTENSION, |
c48ffbcc | 631 | SSL_R_UNSOLICITED_EXTENSION); |
b186a592 MC |
632 | goto err; |
633 | } | |
1266eefd MC |
634 | if (thisex != NULL) { |
635 | thisex->data = extension; | |
636 | thisex->present = 1; | |
637 | thisex->type = type; | |
193b5d76 | 638 | thisex->received_order = i++; |
b93a295a TS |
639 | if (s->ext.debug_cb) |
640 | s->ext.debug_cb(s, !s->server, thisex->type, | |
641 | PACKET_data(&thisex->data), | |
642 | PACKET_remaining(&thisex->data), | |
643 | s->ext.debug_arg); | |
6b473aca MC |
644 | } |
645 | } | |
646 | ||
735d5b59 TT |
647 | if (init) { |
648 | /* | |
649 | * Initialise all known extensions relevant to this context, | |
650 | * whether we have found them or not | |
651 | */ | |
652 | for (thisexd = ext_defs, i = 0; i < OSSL_NELEM(ext_defs); | |
653 | i++, thisexd++) { | |
bf5c84f5 TT |
654 | if (thisexd->init != NULL && (thisexd->context & context) != 0 |
655 | && extension_is_relevant(s, thisexd->context, context) | |
656 | && !thisexd->init(s, context)) { | |
f63a17d6 | 657 | /* SSLfatal() already called */ |
735d5b59 TT |
658 | goto err; |
659 | } | |
68db4dda MC |
660 | } |
661 | } | |
662 | ||
6b473aca | 663 | *res = raw_extensions; |
fc5ece2e BK |
664 | if (len != NULL) |
665 | *len = num_exts; | |
6b473aca MC |
666 | return 1; |
667 | ||
668 | err: | |
669 | OPENSSL_free(raw_extensions); | |
670 | return 0; | |
671 | } | |
672 | ||
68db4dda | 673 | /* |
70af3d8e MC |
674 | * Runs the parser for a given extension with index |idx|. |exts| contains the |
675 | * list of all parsed extensions previously collected by | |
676 | * tls_collect_extensions(). The parser is only run if it is applicable for the | |
f97d4c37 MC |
677 | * given |context| and the parser has not already been run. If this is for a |
678 | * Certificate message, then we also provide the parser with the relevant | |
8521ced6 | 679 | * Certificate |x| and its position in the |chainidx| with 0 being the first |
29bfd5b7 MC |
680 | * Certificate. Returns 1 on success or 0 on failure. If an extension is not |
681 | * present this counted as success. | |
68db4dda | 682 | */ |
d270de32 | 683 | int tls_parse_extension(SSL *s, TLSEXT_INDEX idx, int context, |
f63a17d6 | 684 | RAW_EXTENSION *exts, X509 *x, size_t chainidx) |
6b473aca | 685 | { |
70af3d8e | 686 | RAW_EXTENSION *currext = &exts[idx]; |
61138358 | 687 | int (*parser)(SSL *s, PACKET *pkt, unsigned int context, X509 *x, |
f63a17d6 | 688 | size_t chainidx) = NULL; |
6b473aca | 689 | |
70af3d8e MC |
690 | /* Skip if the extension is not present */ |
691 | if (!currext->present) | |
692 | return 1; | |
6b473aca | 693 | |
70af3d8e MC |
694 | /* Skip if we've already parsed this extension */ |
695 | if (currext->parsed) | |
696 | return 1; | |
6b473aca | 697 | |
70af3d8e MC |
698 | currext->parsed = 1; |
699 | ||
700 | if (idx < OSSL_NELEM(ext_defs)) { | |
701 | /* We are handling a built-in extension */ | |
702 | const EXTENSION_DEFINITION *extdef = &ext_defs[idx]; | |
703 | ||
704 | /* Check if extension is defined for our protocol. If not, skip */ | |
705 | if (!extension_is_relevant(s, extdef->context, context)) | |
706 | return 1; | |
707 | ||
1266eefd | 708 | parser = s->server ? extdef->parse_ctos : extdef->parse_stoc; |
224135e9 | 709 | |
1266eefd | 710 | if (parser != NULL) |
f63a17d6 | 711 | return parser(s, &currext->data, context, x, chainidx); |
6b473aca | 712 | |
70af3d8e MC |
713 | /* |
714 | * If the parser is NULL we fall through to the custom extension | |
715 | * processing | |
716 | */ | |
6b473aca MC |
717 | } |
718 | ||
43ae5eed | 719 | /* Parse custom extensions */ |
f63a17d6 MC |
720 | return custom_ext_parse(s, context, currext->type, |
721 | PACKET_data(&currext->data), | |
722 | PACKET_remaining(&currext->data), | |
723 | x, chainidx); | |
805a2e9e MC |
724 | } |
725 | ||
726 | /* | |
727 | * Parse all remaining extensions that have not yet been parsed. Also calls the | |
735d5b59 TT |
728 | * finalisation for all extensions at the end if |fin| is nonzero, whether we |
729 | * collected them or not. Returns 1 for success or 0 for failure. If we are | |
730 | * working on a Certificate message then we also pass the Certificate |x| and | |
29bfd5b7 | 731 | * its position in the |chainidx|, with 0 being the first certificate. |
805a2e9e | 732 | */ |
f97d4c37 | 733 | int tls_parse_all_extensions(SSL *s, int context, RAW_EXTENSION *exts, X509 *x, |
f63a17d6 | 734 | size_t chainidx, int fin) |
805a2e9e | 735 | { |
1266eefd | 736 | size_t i, numexts = OSSL_NELEM(ext_defs); |
d270de32 | 737 | const EXTENSION_DEFINITION *thisexd; |
805a2e9e | 738 | |
70af3d8e | 739 | /* Calculate the number of extensions in the extensions list */ |
43ae5eed | 740 | numexts += s->cert->custext.meths_count; |
70af3d8e MC |
741 | |
742 | /* Parse each extension in turn */ | |
1266eefd | 743 | for (i = 0; i < numexts; i++) { |
f63a17d6 MC |
744 | if (!tls_parse_extension(s, i, context, exts, x, chainidx)) { |
745 | /* SSLfatal() already called */ | |
70af3d8e | 746 | return 0; |
f63a17d6 | 747 | } |
70af3d8e | 748 | } |
805a2e9e | 749 | |
735d5b59 TT |
750 | if (fin) { |
751 | /* | |
752 | * Finalise all known extensions relevant to this context, | |
753 | * whether we have found them or not | |
754 | */ | |
755 | for (i = 0, thisexd = ext_defs; i < OSSL_NELEM(ext_defs); | |
756 | i++, thisexd++) { | |
bf5c84f5 | 757 | if (thisexd->final != NULL && (thisexd->context & context) != 0 |
f63a17d6 MC |
758 | && !thisexd->final(s, context, exts[i].present)) { |
759 | /* SSLfatal() already called */ | |
735d5b59 | 760 | return 0; |
f63a17d6 | 761 | } |
735d5b59 | 762 | } |
68db4dda MC |
763 | } |
764 | ||
6b473aca MC |
765 | return 1; |
766 | } | |
767 | ||
43ae5eed MC |
768 | int should_add_extension(SSL *s, unsigned int extctx, unsigned int thisctx, |
769 | int max_version) | |
770 | { | |
771 | /* Skip if not relevant for our context */ | |
772 | if ((extctx & thisctx) == 0) | |
773 | return 0; | |
774 | ||
775 | /* Check if this extension is defined for our protocol. If not, skip */ | |
ee36b963 | 776 | if (!extension_is_relevant(s, extctx, thisctx) |
43ae5eed MC |
777 | || ((extctx & SSL_EXT_TLS1_3_ONLY) != 0 |
778 | && (thisctx & SSL_EXT_CLIENT_HELLO) != 0 | |
779 | && (SSL_IS_DTLS(s) || max_version < TLS1_3_VERSION))) | |
780 | return 0; | |
781 | ||
782 | return 1; | |
783 | } | |
784 | ||
6b473aca | 785 | /* |
70af3d8e | 786 | * Construct all the extensions relevant to the current |context| and write |
30aeba43 | 787 | * them to |pkt|. If this is an extension for a Certificate in a Certificate |
8521ced6 MC |
788 | * message, then |x| will be set to the Certificate we are handling, and |
789 | * |chainidx| will indicate the position in the chainidx we are processing (with | |
f63a17d6 | 790 | * 0 being the first in the chain). Returns 1 on success or 0 on failure. On a |
8521ced6 | 791 | * failure construction stops at the first extension to fail to construct. |
6b473aca | 792 | */ |
224135e9 | 793 | int tls_construct_extensions(SSL *s, WPACKET *pkt, unsigned int context, |
f63a17d6 | 794 | X509 *x, size_t chainidx) |
224135e9 | 795 | { |
1266eefd | 796 | size_t i; |
f63a17d6 | 797 | int min_version, max_version = 0, reason; |
d270de32 | 798 | const EXTENSION_DEFINITION *thisexd; |
224135e9 MC |
799 | |
800 | if (!WPACKET_start_sub_packet_u16(pkt) | |
801 | /* | |
802 | * If extensions are of zero length then we don't even add the | |
1c259bb5 BK |
803 | * extensions length bytes to a ClientHello/ServerHello |
804 | * (for non-TLSv1.3). | |
224135e9 | 805 | */ |
fe874d27 MC |
806 | || ((context & |
807 | (SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO)) != 0 | |
fe874d27 | 808 | && !WPACKET_set_flags(pkt, |
224135e9 | 809 | WPACKET_FLAGS_ABANDON_ON_ZERO_LENGTH))) { |
c48ffbcc | 810 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
f63a17d6 | 811 | return 0; |
224135e9 MC |
812 | } |
813 | ||
fe874d27 | 814 | if ((context & SSL_EXT_CLIENT_HELLO) != 0) { |
b5b993b2 | 815 | reason = ssl_get_min_max_version(s, &min_version, &max_version, NULL); |
ab83e314 | 816 | if (reason != 0) { |
c48ffbcc | 817 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, reason); |
f63a17d6 | 818 | return 0; |
ab83e314 MC |
819 | } |
820 | } | |
821 | ||
822 | /* Add custom extensions first */ | |
fe874d27 | 823 | if ((context & SSL_EXT_CLIENT_HELLO) != 0) { |
44e69951 | 824 | /* On the server side with initialise during ClientHello parsing */ |
43ae5eed | 825 | custom_ext_init(&s->cert->custext); |
ab83e314 | 826 | } |
f63a17d6 MC |
827 | if (!custom_ext_add(s, context, pkt, x, chainidx, max_version)) { |
828 | /* SSLfatal() already called */ | |
829 | return 0; | |
ab83e314 MC |
830 | } |
831 | ||
1266eefd | 832 | for (i = 0, thisexd = ext_defs; i < OSSL_NELEM(ext_defs); i++, thisexd++) { |
b186a592 | 833 | EXT_RETURN (*construct)(SSL *s, WPACKET *pkt, unsigned int context, |
f63a17d6 | 834 | X509 *x, size_t chainidx); |
b186a592 | 835 | EXT_RETURN ret; |
4b299b8e | 836 | |
224135e9 | 837 | /* Skip if not relevant for our context */ |
43ae5eed | 838 | if (!should_add_extension(s, thisexd->context, context, max_version)) |
224135e9 MC |
839 | continue; |
840 | ||
1266eefd MC |
841 | construct = s->server ? thisexd->construct_stoc |
842 | : thisexd->construct_ctos; | |
224135e9 | 843 | |
43ae5eed | 844 | if (construct == NULL) |
224135e9 MC |
845 | continue; |
846 | ||
f63a17d6 MC |
847 | ret = construct(s, pkt, context, x, chainidx); |
848 | if (ret == EXT_RETURN_FAIL) { | |
849 | /* SSLfatal() already called */ | |
850 | return 0; | |
851 | } | |
b186a592 MC |
852 | if (ret == EXT_RETURN_SENT |
853 | && (context & (SSL_EXT_CLIENT_HELLO | |
854 | | SSL_EXT_TLS1_3_CERTIFICATE_REQUEST | |
855 | | SSL_EXT_TLS1_3_NEW_SESSION_TICKET)) != 0) | |
856 | s->ext.extflags[i] |= SSL_EXT_FLAG_SENT; | |
224135e9 MC |
857 | } |
858 | ||
224135e9 | 859 | if (!WPACKET_close(pkt)) { |
c48ffbcc | 860 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
f63a17d6 | 861 | return 0; |
224135e9 MC |
862 | } |
863 | ||
864 | return 1; | |
865 | } | |
805a2e9e | 866 | |
70af3d8e MC |
867 | /* |
868 | * Built in extension finalisation and initialisation functions. All initialise | |
869 | * or finalise the associated extension type for the given |context|. For | |
870 | * finalisers |sent| is set to 1 if we saw the extension during parsing, and 0 | |
29bfd5b7 | 871 | * otherwise. These functions return 1 on success or 0 on failure. |
70af3d8e MC |
872 | */ |
873 | ||
f63a17d6 | 874 | static int final_renegotiate(SSL *s, unsigned int context, int sent) |
805a2e9e | 875 | { |
332eb390 MC |
876 | if (!s->server) { |
877 | /* | |
878 | * Check if we can connect to a server that doesn't support safe | |
879 | * renegotiation | |
880 | */ | |
881 | if (!(s->options & SSL_OP_LEGACY_SERVER_CONNECT) | |
882 | && !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION) | |
883 | && !sent) { | |
c48ffbcc | 884 | SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE, |
f63a17d6 | 885 | SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED); |
332eb390 MC |
886 | return 0; |
887 | } | |
888 | ||
805a2e9e | 889 | return 1; |
332eb390 | 890 | } |
805a2e9e MC |
891 | |
892 | /* Need RI if renegotiating */ | |
893 | if (s->renegotiate | |
894 | && !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION) | |
895 | && !sent) { | |
c48ffbcc | 896 | SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE, |
f63a17d6 | 897 | SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED); |
805a2e9e MC |
898 | return 0; |
899 | } | |
900 | ||
332eb390 | 901 | |
805a2e9e MC |
902 | return 1; |
903 | } | |
904 | ||
1266eefd | 905 | static int init_server_name(SSL *s, unsigned int context) |
805a2e9e | 906 | { |
f01344cb | 907 | if (s->server) { |
805a2e9e MC |
908 | s->servername_done = 0; |
909 | ||
f01344cb MC |
910 | OPENSSL_free(s->ext.hostname); |
911 | s->ext.hostname = NULL; | |
912 | } | |
913 | ||
805a2e9e MC |
914 | return 1; |
915 | } | |
916 | ||
f63a17d6 | 917 | static int final_server_name(SSL *s, unsigned int context, int sent) |
805a2e9e | 918 | { |
9ef9088c | 919 | int ret = SSL_TLSEXT_ERR_NOACK; |
805a2e9e | 920 | int altmp = SSL_AD_UNRECOGNIZED_NAME; |
a84e5c9a | 921 | int was_ticket = (SSL_get_options(s) & SSL_OP_NO_TICKET) == 0; |
805a2e9e | 922 | |
c4715212 | 923 | if (!ossl_assert(s->ctx != NULL) || !ossl_assert(s->session_ctx != NULL)) { |
c48ffbcc | 924 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
c4715212 MC |
925 | return 0; |
926 | } | |
927 | ||
928 | if (s->ctx->ext.servername_cb != NULL) | |
aff8c126 RS |
929 | ret = s->ctx->ext.servername_cb(s, &altmp, |
930 | s->ctx->ext.servername_arg); | |
c4715212 | 931 | else if (s->session_ctx->ext.servername_cb != NULL) |
222da979 TS |
932 | ret = s->session_ctx->ext.servername_cb(s, &altmp, |
933 | s->session_ctx->ext.servername_arg); | |
805a2e9e | 934 | |
1c4aa31d BK |
935 | /* |
936 | * For servers, propagate the SNI hostname from the temporary | |
937 | * storage in the SSL to the persistent SSL_SESSION, now that we | |
938 | * know we accepted it. | |
939 | * Clients make this copy when parsing the server's response to | |
940 | * the extension, which is when they find out that the negotiation | |
941 | * was successful. | |
942 | */ | |
943 | if (s->server) { | |
2a538551 | 944 | if (sent && ret == SSL_TLSEXT_ERR_OK && !s->hit) { |
1c4aa31d BK |
945 | /* Only store the hostname in the session if we accepted it. */ |
946 | OPENSSL_free(s->session->ext.hostname); | |
947 | s->session->ext.hostname = OPENSSL_strdup(s->ext.hostname); | |
948 | if (s->session->ext.hostname == NULL && s->ext.hostname != NULL) { | |
c48ffbcc | 949 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
1c4aa31d BK |
950 | } |
951 | } | |
9fb6cb81 MC |
952 | } |
953 | ||
3be08e30 BK |
954 | /* |
955 | * If we switched contexts (whether here or in the client_hello callback), | |
956 | * move the sess_accept increment from the session_ctx to the new | |
957 | * context, to avoid the confusing situation of having sess_accept_good | |
958 | * exceed sess_accept (zero) for the new context. | |
959 | */ | |
42141197 | 960 | if (SSL_IS_FIRST_HANDSHAKE(s) && s->ctx != s->session_ctx |
961 | && s->hello_retry_request == SSL_HRR_NONE) { | |
9ef9088c | 962 | tsan_counter(&s->ctx->stats.sess_accept); |
2aaa0b14 | 963 | tsan_decr(&s->session_ctx->stats.sess_accept); |
3be08e30 BK |
964 | } |
965 | ||
a84e5c9a TS |
966 | /* |
967 | * If we're expecting to send a ticket, and tickets were previously enabled, | |
968 | * and now tickets are disabled, then turn off expected ticket. | |
969 | * Also, if this is not a resumption, create a new session ID | |
970 | */ | |
971 | if (ret == SSL_TLSEXT_ERR_OK && s->ext.ticket_expected | |
972 | && was_ticket && (SSL_get_options(s) & SSL_OP_NO_TICKET) != 0) { | |
973 | s->ext.ticket_expected = 0; | |
974 | if (!s->hit) { | |
975 | SSL_SESSION* ss = SSL_get_session(s); | |
976 | ||
977 | if (ss != NULL) { | |
978 | OPENSSL_free(ss->ext.tick); | |
979 | ss->ext.tick = NULL; | |
980 | ss->ext.ticklen = 0; | |
981 | ss->ext.tick_lifetime_hint = 0; | |
982 | ss->ext.tick_age_add = 0; | |
a84e5c9a | 983 | if (!ssl_generate_session_id(s, ss)) { |
c48ffbcc | 984 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
f63a17d6 | 985 | return 0; |
a84e5c9a TS |
986 | } |
987 | } else { | |
c48ffbcc | 988 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
f63a17d6 | 989 | return 0; |
a84e5c9a TS |
990 | } |
991 | } | |
992 | } | |
993 | ||
805a2e9e MC |
994 | switch (ret) { |
995 | case SSL_TLSEXT_ERR_ALERT_FATAL: | |
c48ffbcc | 996 | SSLfatal(s, altmp, SSL_R_CALLBACK_FAILED); |
805a2e9e MC |
997 | return 0; |
998 | ||
999 | case SSL_TLSEXT_ERR_ALERT_WARNING: | |
fb62e47c MC |
1000 | /* TLSv1.3 doesn't have warning alerts so we suppress this */ |
1001 | if (!SSL_IS_TLS13(s)) | |
1002 | ssl3_send_alert(s, SSL3_AL_WARNING, altmp); | |
cd624ccd | 1003 | s->servername_done = 0; |
805a2e9e MC |
1004 | return 1; |
1005 | ||
1006 | case SSL_TLSEXT_ERR_NOACK: | |
1007 | s->servername_done = 0; | |
1008 | return 1; | |
1009 | ||
1010 | default: | |
1011 | return 1; | |
1012 | } | |
1013 | } | |
1014 | ||
332eb390 | 1015 | #ifndef OPENSSL_NO_EC |
f63a17d6 | 1016 | static int final_ec_pt_formats(SSL *s, unsigned int context, int sent) |
332eb390 MC |
1017 | { |
1018 | unsigned long alg_k, alg_a; | |
1019 | ||
1020 | if (s->server) | |
1021 | return 1; | |
1022 | ||
555cbb32 TS |
1023 | alg_k = s->s3.tmp.new_cipher->algorithm_mkey; |
1024 | alg_a = s->s3.tmp.new_cipher->algorithm_auth; | |
332eb390 MC |
1025 | |
1026 | /* | |
1027 | * If we are client and using an elliptic curve cryptography cipher | |
1028 | * suite, then if server returns an EC point formats lists extension it | |
1029 | * must contain uncompressed. | |
1030 | */ | |
aff8c126 RS |
1031 | if (s->ext.ecpointformats != NULL |
1032 | && s->ext.ecpointformats_len > 0 | |
cd0fb43c MC |
1033 | && s->ext.peer_ecpointformats != NULL |
1034 | && s->ext.peer_ecpointformats_len > 0 | |
1266eefd | 1035 | && ((alg_k & SSL_kECDHE) || (alg_a & SSL_aECDSA))) { |
332eb390 MC |
1036 | /* we are using an ECC cipher */ |
1037 | size_t i; | |
cd0fb43c | 1038 | unsigned char *list = s->ext.peer_ecpointformats; |
1266eefd | 1039 | |
cd0fb43c | 1040 | for (i = 0; i < s->ext.peer_ecpointformats_len; i++) { |
1266eefd | 1041 | if (*list++ == TLSEXT_ECPOINTFORMAT_uncompressed) |
332eb390 | 1042 | break; |
332eb390 | 1043 | } |
cd0fb43c | 1044 | if (i == s->ext.peer_ecpointformats_len) { |
c48ffbcc | 1045 | SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, |
f63a17d6 | 1046 | SSL_R_TLS_INVALID_ECPOINTFORMAT_LIST); |
332eb390 MC |
1047 | return 0; |
1048 | } | |
1049 | } | |
1050 | ||
1051 | return 1; | |
1052 | } | |
1053 | #endif | |
1054 | ||
1266eefd | 1055 | static int init_session_ticket(SSL *s, unsigned int context) |
332eb390 MC |
1056 | { |
1057 | if (!s->server) | |
aff8c126 | 1058 | s->ext.ticket_expected = 0; |
332eb390 MC |
1059 | |
1060 | return 1; | |
1061 | } | |
1062 | ||
8f8c11d8 | 1063 | #ifndef OPENSSL_NO_OCSP |
1266eefd | 1064 | static int init_status_request(SSL *s, unsigned int context) |
805a2e9e | 1065 | { |
f63e4288 | 1066 | if (s->server) { |
aff8c126 | 1067 | s->ext.status_type = TLSEXT_STATUSTYPE_nothing; |
f63e4288 MC |
1068 | } else { |
1069 | /* | |
1070 | * Ensure we get sensible values passed to tlsext_status_cb in the event | |
1071 | * that we don't receive a status message | |
1072 | */ | |
8cbfcc70 RS |
1073 | OPENSSL_free(s->ext.ocsp.resp); |
1074 | s->ext.ocsp.resp = NULL; | |
1075 | s->ext.ocsp.resp_len = 0; | |
f63e4288 | 1076 | } |
332eb390 MC |
1077 | |
1078 | return 1; | |
1079 | } | |
8f8c11d8 | 1080 | #endif |
332eb390 | 1081 | |
805a2e9e | 1082 | #ifndef OPENSSL_NO_NEXTPROTONEG |
1266eefd | 1083 | static int init_npn(SSL *s, unsigned int context) |
805a2e9e | 1084 | { |
555cbb32 | 1085 | s->s3.npn_seen = 0; |
805a2e9e MC |
1086 | |
1087 | return 1; | |
1088 | } | |
1089 | #endif | |
1090 | ||
1266eefd | 1091 | static int init_alpn(SSL *s, unsigned int context) |
805a2e9e | 1092 | { |
555cbb32 TS |
1093 | OPENSSL_free(s->s3.alpn_selected); |
1094 | s->s3.alpn_selected = NULL; | |
1095 | s->s3.alpn_selected_len = 0; | |
805a2e9e | 1096 | if (s->server) { |
555cbb32 TS |
1097 | OPENSSL_free(s->s3.alpn_proposed); |
1098 | s->s3.alpn_proposed = NULL; | |
1099 | s->s3.alpn_proposed_len = 0; | |
805a2e9e | 1100 | } |
805a2e9e MC |
1101 | return 1; |
1102 | } | |
1103 | ||
f63a17d6 | 1104 | static int final_alpn(SSL *s, unsigned int context, int sent) |
630369d9 | 1105 | { |
4be3a7c7 MC |
1106 | if (!s->server && !sent && s->session->ext.alpn_selected != NULL) |
1107 | s->ext.early_data_ok = 0; | |
1108 | ||
630369d9 MC |
1109 | if (!s->server || !SSL_IS_TLS13(s)) |
1110 | return 1; | |
1111 | ||
1112 | /* | |
1113 | * Call alpn_select callback if needed. Has to be done after SNI and | |
1114 | * cipher negotiation (HTTP/2 restricts permitted ciphers). In TLSv1.3 | |
1115 | * we also have to do this before we decide whether to accept early_data. | |
1116 | * In TLSv1.3 we've already negotiated our cipher so we do this call now. | |
1117 | * For < TLSv1.3 we defer it until after cipher negotiation. | |
56d36288 | 1118 | * |
f63a17d6 | 1119 | * On failure SSLfatal() already called. |
630369d9 | 1120 | */ |
f63a17d6 | 1121 | return tls_handle_alpn(s); |
630369d9 MC |
1122 | } |
1123 | ||
1266eefd | 1124 | static int init_sig_algs(SSL *s, unsigned int context) |
805a2e9e MC |
1125 | { |
1126 | /* Clear any signature algorithms extension received */ | |
555cbb32 TS |
1127 | OPENSSL_free(s->s3.tmp.peer_sigalgs); |
1128 | s->s3.tmp.peer_sigalgs = NULL; | |
805a2e9e MC |
1129 | |
1130 | return 1; | |
1131 | } | |
1132 | ||
a7e6a3d8 | 1133 | static int init_sig_algs_cert(SSL *s, ossl_unused unsigned int context) |
c589c34e BK |
1134 | { |
1135 | /* Clear any signature algorithms extension received */ | |
555cbb32 TS |
1136 | OPENSSL_free(s->s3.tmp.peer_cert_sigalgs); |
1137 | s->s3.tmp.peer_cert_sigalgs = NULL; | |
c589c34e BK |
1138 | |
1139 | return 1; | |
1140 | } | |
1141 | ||
805a2e9e | 1142 | #ifndef OPENSSL_NO_SRP |
1266eefd | 1143 | static int init_srp(SSL *s, unsigned int context) |
805a2e9e MC |
1144 | { |
1145 | OPENSSL_free(s->srp_ctx.login); | |
1146 | s->srp_ctx.login = NULL; | |
1147 | ||
1148 | return 1; | |
1149 | } | |
1150 | #endif | |
1151 | ||
1266eefd | 1152 | static int init_etm(SSL *s, unsigned int context) |
805a2e9e | 1153 | { |
28a31a0a | 1154 | s->ext.use_etm = 0; |
332eb390 MC |
1155 | |
1156 | return 1; | |
1157 | } | |
1158 | ||
1266eefd | 1159 | static int init_ems(SSL *s, unsigned int context) |
332eb390 | 1160 | { |
11d3235e TM |
1161 | if (s->s3.flags & TLS1_FLAGS_RECEIVED_EXTMS) { |
1162 | s->s3.flags &= ~TLS1_FLAGS_RECEIVED_EXTMS; | |
1163 | s->s3.flags |= TLS1_FLAGS_REQUIRED_EXTMS; | |
1164 | } | |
332eb390 MC |
1165 | |
1166 | return 1; | |
1167 | } | |
1168 | ||
f63a17d6 | 1169 | static int final_ems(SSL *s, unsigned int context, int sent) |
332eb390 | 1170 | { |
11d3235e TM |
1171 | /* |
1172 | * Check extended master secret extension is not dropped on | |
1173 | * renegotiation. | |
1174 | */ | |
1175 | if (!(s->s3.flags & TLS1_FLAGS_RECEIVED_EXTMS) | |
1176 | && (s->s3.flags & TLS1_FLAGS_REQUIRED_EXTMS)) { | |
c48ffbcc | 1177 | SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE, SSL_R_INCONSISTENT_EXTMS); |
11d3235e TM |
1178 | return 0; |
1179 | } | |
332eb390 MC |
1180 | if (!s->server && s->hit) { |
1181 | /* | |
1182 | * Check extended master secret extension is consistent with | |
1183 | * original session. | |
1184 | */ | |
555cbb32 | 1185 | if (!(s->s3.flags & TLS1_FLAGS_RECEIVED_EXTMS) != |
332eb390 | 1186 | !(s->session->flags & SSL_SESS_FLAG_EXTMS)) { |
c48ffbcc | 1187 | SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE, SSL_R_INCONSISTENT_EXTMS); |
332eb390 MC |
1188 | return 0; |
1189 | } | |
1190 | } | |
805a2e9e MC |
1191 | |
1192 | return 1; | |
1193 | } | |
1194 | ||
45615c5f DSH |
1195 | static int init_certificate_authorities(SSL *s, unsigned int context) |
1196 | { | |
555cbb32 TS |
1197 | sk_X509_NAME_pop_free(s->s3.tmp.peer_ca_names, X509_NAME_free); |
1198 | s->s3.tmp.peer_ca_names = NULL; | |
45615c5f DSH |
1199 | return 1; |
1200 | } | |
1201 | ||
b186a592 MC |
1202 | static EXT_RETURN tls_construct_certificate_authorities(SSL *s, WPACKET *pkt, |
1203 | unsigned int context, | |
1204 | X509 *x, | |
f63a17d6 | 1205 | size_t chainidx) |
45615c5f | 1206 | { |
98732979 | 1207 | const STACK_OF(X509_NAME) *ca_sk = get_ca_names(s); |
45615c5f DSH |
1208 | |
1209 | if (ca_sk == NULL || sk_X509_NAME_num(ca_sk) == 0) | |
b186a592 | 1210 | return EXT_RETURN_NOT_SENT; |
45615c5f DSH |
1211 | |
1212 | if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_certificate_authorities) | |
f63a17d6 | 1213 | || !WPACKET_start_sub_packet_u16(pkt)) { |
c48ffbcc | 1214 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
b186a592 | 1215 | return EXT_RETURN_FAIL; |
45615c5f DSH |
1216 | } |
1217 | ||
98732979 | 1218 | if (!construct_ca_names(s, ca_sk, pkt)) { |
f63a17d6 MC |
1219 | /* SSLfatal() already called */ |
1220 | return EXT_RETURN_FAIL; | |
1221 | } | |
1222 | ||
1223 | if (!WPACKET_close(pkt)) { | |
c48ffbcc | 1224 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
f63a17d6 MC |
1225 | return EXT_RETURN_FAIL; |
1226 | } | |
1227 | ||
b186a592 | 1228 | return EXT_RETURN_SENT; |
45615c5f DSH |
1229 | } |
1230 | ||
1231 | static int tls_parse_certificate_authorities(SSL *s, PACKET *pkt, | |
1232 | unsigned int context, X509 *x, | |
f63a17d6 | 1233 | size_t chainidx) |
45615c5f | 1234 | { |
f63a17d6 | 1235 | if (!parse_ca_names(s, pkt)) |
45615c5f DSH |
1236 | return 0; |
1237 | if (PACKET_remaining(pkt) != 0) { | |
c48ffbcc | 1238 | SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_R_BAD_EXTENSION); |
45615c5f DSH |
1239 | return 0; |
1240 | } | |
1241 | return 1; | |
1242 | } | |
1243 | ||
805a2e9e | 1244 | #ifndef OPENSSL_NO_SRTP |
1266eefd | 1245 | static int init_srtp(SSL *s, unsigned int context) |
805a2e9e MC |
1246 | { |
1247 | if (s->server) | |
1248 | s->srtp_profile = NULL; | |
1249 | ||
1250 | return 1; | |
1251 | } | |
1252 | #endif | |
04904312 | 1253 | |
f63a17d6 | 1254 | static int final_sig_algs(SSL *s, unsigned int context, int sent) |
04904312 | 1255 | { |
108d45df | 1256 | if (!sent && SSL_IS_TLS13(s) && !s->hit) { |
c48ffbcc | 1257 | SSLfatal(s, TLS13_AD_MISSING_EXTENSION, |
f63a17d6 | 1258 | SSL_R_MISSING_SIGALGS_EXTENSION); |
04904312 MC |
1259 | return 0; |
1260 | } | |
1261 | ||
1262 | return 1; | |
1263 | } | |
b2f7e8c0 | 1264 | |
f63a17d6 | 1265 | static int final_key_share(SSL *s, unsigned int context, int sent) |
f4bbb37c | 1266 | { |
65dc5c3c | 1267 | #if !defined(OPENSSL_NO_TLS1_3) |
f4bbb37c MC |
1268 | if (!SSL_IS_TLS13(s)) |
1269 | return 1; | |
1270 | ||
07d447a6 MC |
1271 | /* Nothing to do for key_share in an HRR */ |
1272 | if ((context & SSL_EXT_TLS1_3_HELLO_RETRY_REQUEST) != 0) | |
1273 | return 1; | |
1274 | ||
f4bbb37c MC |
1275 | /* |
1276 | * If | |
aff9929b MC |
1277 | * we are a client |
1278 | * AND | |
f4bbb37c MC |
1279 | * we have no key_share |
1280 | * AND | |
1281 | * (we are not resuming | |
1282 | * OR the kex_mode doesn't allow non key_share resumes) | |
1283 | * THEN | |
aff9929b | 1284 | * fail; |
f4bbb37c | 1285 | */ |
aff9929b MC |
1286 | if (!s->server |
1287 | && !sent | |
f4bbb37c MC |
1288 | && (!s->hit |
1289 | || (s->ext.psk_kex_mode & TLSEXT_KEX_MODE_FLAG_KE) == 0)) { | |
7d061fce | 1290 | /* Nothing left we can do - just fail */ |
c48ffbcc | 1291 | SSLfatal(s, SSL_AD_MISSING_EXTENSION, SSL_R_NO_SUITABLE_KEY_SHARE); |
f4bbb37c MC |
1292 | return 0; |
1293 | } | |
aff9929b | 1294 | /* |
c36001c3 | 1295 | * IF |
aff9929b | 1296 | * we are a server |
aff9929b | 1297 | * THEN |
c36001c3 MC |
1298 | * IF |
1299 | * we have a suitable key_share | |
aff9929b | 1300 | * THEN |
c36001c3 MC |
1301 | * IF |
1302 | * we are stateless AND we have no cookie | |
1303 | * THEN | |
1304 | * send a HelloRetryRequest | |
1305 | * ELSE | |
1306 | * IF | |
1307 | * we didn't already send a HelloRetryRequest | |
1308 | * AND | |
1309 | * the client sent a key_share extension | |
1310 | * AND | |
1311 | * (we are not resuming | |
1312 | * OR the kex_mode allows key_share resumes) | |
1313 | * AND | |
1314 | * a shared group exists | |
1315 | * THEN | |
1316 | * send a HelloRetryRequest | |
1317 | * ELSE IF | |
1318 | * we are not resuming | |
1319 | * OR | |
1320 | * the kex_mode doesn't allow non key_share resumes | |
1321 | * THEN | |
1322 | * fail | |
1323 | * ELSE IF | |
1324 | * we are stateless AND we have no cookie | |
1325 | * THEN | |
1326 | * send a HelloRetryRequest | |
aff9929b | 1327 | */ |
c36001c3 | 1328 | if (s->server) { |
555cbb32 | 1329 | if (s->s3.peer_tmp != NULL) { |
c36001c3 | 1330 | /* We have a suitable key_share */ |
555cbb32 | 1331 | if ((s->s3.flags & TLS1_FLAGS_STATELESS) != 0 |
c36001c3 MC |
1332 | && !s->ext.cookieok) { |
1333 | if (!ossl_assert(s->hello_retry_request == SSL_HRR_NONE)) { | |
1334 | /* | |
1335 | * If we are stateless then we wouldn't know about any | |
1336 | * previously sent HRR - so how can this be anything other | |
1337 | * than 0? | |
1338 | */ | |
c48ffbcc | 1339 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
c36001c3 MC |
1340 | return 0; |
1341 | } | |
1342 | s->hello_retry_request = SSL_HRR_PENDING; | |
1343 | return 1; | |
1344 | } | |
1345 | } else { | |
1346 | /* No suitable key_share */ | |
1347 | if (s->hello_retry_request == SSL_HRR_NONE && sent | |
1348 | && (!s->hit | |
1349 | || (s->ext.psk_kex_mode & TLSEXT_KEX_MODE_FLAG_KE_DHE) | |
1350 | != 0)) { | |
1351 | const uint16_t *pgroups, *clntgroups; | |
1352 | size_t num_groups, clnt_num_groups, i; | |
1353 | unsigned int group_id = 0; | |
1354 | ||
1355 | /* Check if a shared group exists */ | |
1356 | ||
1357 | /* Get the clients list of supported groups. */ | |
1358 | tls1_get_peer_groups(s, &clntgroups, &clnt_num_groups); | |
1359 | tls1_get_supported_groups(s, &pgroups, &num_groups); | |
1360 | ||
1361 | /* | |
1362 | * Find the first group we allow that is also in client's list | |
1363 | */ | |
1364 | for (i = 0; i < num_groups; i++) { | |
1365 | group_id = pgroups[i]; | |
1366 | ||
1367 | if (check_in_list(s, group_id, clntgroups, clnt_num_groups, | |
1368 | 1)) | |
1369 | break; | |
1370 | } | |
1371 | ||
1372 | if (i < num_groups) { | |
1373 | /* A shared group exists so send a HelloRetryRequest */ | |
555cbb32 | 1374 | s->s3.group_id = group_id; |
c36001c3 MC |
1375 | s->hello_retry_request = SSL_HRR_PENDING; |
1376 | return 1; | |
1377 | } | |
1378 | } | |
1379 | if (!s->hit | |
1380 | || (s->ext.psk_kex_mode & TLSEXT_KEX_MODE_FLAG_KE) == 0) { | |
1381 | /* Nothing left we can do - just fail */ | |
1382 | SSLfatal(s, sent ? SSL_AD_HANDSHAKE_FAILURE | |
1383 | : SSL_AD_MISSING_EXTENSION, | |
c48ffbcc | 1384 | SSL_R_NO_SUITABLE_KEY_SHARE); |
c36001c3 | 1385 | return 0; |
aff9929b MC |
1386 | } |
1387 | ||
555cbb32 | 1388 | if ((s->s3.flags & TLS1_FLAGS_STATELESS) != 0 |
c36001c3 MC |
1389 | && !s->ext.cookieok) { |
1390 | if (!ossl_assert(s->hello_retry_request == SSL_HRR_NONE)) { | |
1391 | /* | |
1392 | * If we are stateless then we wouldn't know about any | |
1393 | * previously sent HRR - so how can this be anything other | |
1394 | * than 0? | |
1395 | */ | |
c48ffbcc | 1396 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
c36001c3 MC |
1397 | return 0; |
1398 | } | |
fc7129dc | 1399 | s->hello_retry_request = SSL_HRR_PENDING; |
aff9929b MC |
1400 | return 1; |
1401 | } | |
1402 | } | |
c36001c3 MC |
1403 | |
1404 | /* | |
1405 | * We have a key_share so don't send any more HelloRetryRequest | |
1406 | * messages | |
1407 | */ | |
1408 | if (s->hello_retry_request == SSL_HRR_PENDING) | |
1409 | s->hello_retry_request = SSL_HRR_COMPLETE; | |
1410 | } else { | |
1411 | /* | |
1412 | * For a client side resumption with no key_share we need to generate | |
1413 | * the handshake secret (otherwise this is done during key_share | |
1414 | * processing). | |
1415 | */ | |
1416 | if (!sent && !tls13_generate_handshake_secret(s, NULL, 0)) { | |
c48ffbcc | 1417 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
aff9929b MC |
1418 | return 0; |
1419 | } | |
1420 | } | |
65dc5c3c | 1421 | #endif /* !defined(OPENSSL_NO_TLS1_3) */ |
f4bbb37c MC |
1422 | return 1; |
1423 | } | |
1424 | ||
b2f7e8c0 MC |
1425 | static int init_psk_kex_modes(SSL *s, unsigned int context) |
1426 | { | |
1427 | s->ext.psk_kex_mode = TLSEXT_KEX_MODE_FLAG_NONE; | |
b2f7e8c0 MC |
1428 | return 1; |
1429 | } | |
1053a6e2 MC |
1430 | |
1431 | int tls_psk_do_binder(SSL *s, const EVP_MD *md, const unsigned char *msgstart, | |
1432 | size_t binderoffset, const unsigned char *binderin, | |
3a7c56b2 MC |
1433 | unsigned char *binderout, SSL_SESSION *sess, int sign, |
1434 | int external) | |
1053a6e2 MC |
1435 | { |
1436 | EVP_PKEY *mackey = NULL; | |
1437 | EVP_MD_CTX *mctx = NULL; | |
1438 | unsigned char hash[EVP_MAX_MD_SIZE], binderkey[EVP_MAX_MD_SIZE]; | |
1439 | unsigned char finishedkey[EVP_MAX_MD_SIZE], tmpbinder[EVP_MAX_MD_SIZE]; | |
4ff1a526 | 1440 | unsigned char *early_secret; |
48102247 | 1441 | #ifdef CHARSET_EBCDIC |
6ed12cec | 1442 | static const unsigned char resumption_label[] = { 0x72, 0x65, 0x73, 0x20, 0x62, 0x69, 0x6E, 0x64, 0x65, 0x72, 0x00 }; |
48102247 | 1443 | static const unsigned char external_label[] = { 0x65, 0x78, 0x74, 0x20, 0x62, 0x69, 0x6E, 0x64, 0x65, 0x72, 0x00 }; |
1444 | #else | |
4ff1a526 MC |
1445 | static const unsigned char resumption_label[] = "res binder"; |
1446 | static const unsigned char external_label[] = "ext binder"; | |
48102247 | 1447 | #endif |
4ff1a526 MC |
1448 | const unsigned char *label; |
1449 | size_t bindersize, labelsize, hashsize; | |
bceae201 | 1450 | int hashsizei = EVP_MD_size(md); |
1053a6e2 | 1451 | int ret = -1; |
add8d0e9 MC |
1452 | int usepskfored = 0; |
1453 | ||
bceae201 MC |
1454 | /* Ensure cast to size_t is safe */ |
1455 | if (!ossl_assert(hashsizei >= 0)) { | |
c48ffbcc | 1456 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
bceae201 MC |
1457 | goto err; |
1458 | } | |
1459 | hashsize = (size_t)hashsizei; | |
1460 | ||
add8d0e9 MC |
1461 | if (external |
1462 | && s->early_data_state == SSL_EARLY_DATA_CONNECTING | |
1463 | && s->session->ext.max_early_data == 0 | |
1464 | && sess->ext.max_early_data > 0) | |
1465 | usepskfored = 1; | |
1053a6e2 | 1466 | |
3a7c56b2 MC |
1467 | if (external) { |
1468 | label = external_label; | |
1469 | labelsize = sizeof(external_label) - 1; | |
1470 | } else { | |
1471 | label = resumption_label; | |
1472 | labelsize = sizeof(resumption_label) - 1; | |
1473 | } | |
1474 | ||
9368f865 MC |
1475 | /* |
1476 | * Generate the early_secret. On the server side we've selected a PSK to | |
1477 | * resume with (internal or external) so we always do this. On the client | |
add8d0e9 MC |
1478 | * side we do this for a non-external (i.e. resumption) PSK or external PSK |
1479 | * that will be used for early_data so that it is in place for sending early | |
1480 | * data. For client side external PSK not being used for early_data we | |
9368f865 MC |
1481 | * generate it but store it away for later use. |
1482 | */ | |
add8d0e9 | 1483 | if (s->server || !external || usepskfored) |
9368f865 MC |
1484 | early_secret = (unsigned char *)s->early_secret; |
1485 | else | |
1486 | early_secret = (unsigned char *)sess->early_secret; | |
4ff1a526 MC |
1487 | |
1488 | if (!tls13_generate_secret(s, md, NULL, sess->master_key, | |
1489 | sess->master_key_length, early_secret)) { | |
635c8f77 | 1490 | /* SSLfatal() already called */ |
1053a6e2 MC |
1491 | goto err; |
1492 | } | |
1493 | ||
1494 | /* | |
1495 | * Create the handshake hash for the binder key...the messages so far are | |
1496 | * empty! | |
1497 | */ | |
1498 | mctx = EVP_MD_CTX_new(); | |
1499 | if (mctx == NULL | |
1500 | || EVP_DigestInit_ex(mctx, md, NULL) <= 0 | |
1501 | || EVP_DigestFinal_ex(mctx, hash, NULL) <= 0) { | |
c48ffbcc | 1502 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
1053a6e2 MC |
1503 | goto err; |
1504 | } | |
1505 | ||
1506 | /* Generate the binder key */ | |
4ff1a526 | 1507 | if (!tls13_hkdf_expand(s, md, early_secret, label, labelsize, hash, |
0fb2815b | 1508 | hashsize, binderkey, hashsize, 1)) { |
635c8f77 | 1509 | /* SSLfatal() already called */ |
1053a6e2 MC |
1510 | goto err; |
1511 | } | |
1512 | ||
1513 | /* Generate the finished key */ | |
1514 | if (!tls13_derive_finishedkey(s, md, binderkey, finishedkey, hashsize)) { | |
635c8f77 | 1515 | /* SSLfatal() already called */ |
1053a6e2 MC |
1516 | goto err; |
1517 | } | |
1518 | ||
aff9929b | 1519 | if (EVP_DigestInit_ex(mctx, md, NULL) <= 0) { |
c48ffbcc | 1520 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
aff9929b MC |
1521 | goto err; |
1522 | } | |
1523 | ||
1053a6e2 | 1524 | /* |
aff9929b MC |
1525 | * Get a hash of the ClientHello up to the start of the binders. If we are |
1526 | * following a HelloRetryRequest then this includes the hash of the first | |
1527 | * ClientHello and the HelloRetryRequest itself. | |
1053a6e2 | 1528 | */ |
fc7129dc | 1529 | if (s->hello_retry_request == SSL_HRR_PENDING) { |
aff9929b | 1530 | size_t hdatalen; |
60690b5b | 1531 | long hdatalen_l; |
aff9929b MC |
1532 | void *hdata; |
1533 | ||
60690b5b | 1534 | hdatalen = hdatalen_l = |
555cbb32 | 1535 | BIO_get_mem_data(s->s3.handshake_buffer, &hdata); |
60690b5b | 1536 | if (hdatalen_l <= 0) { |
c48ffbcc | 1537 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_R_BAD_HANDSHAKE_LENGTH); |
aff9929b MC |
1538 | goto err; |
1539 | } | |
1540 | ||
1541 | /* | |
1542 | * For servers the handshake buffer data will include the second | |
1543 | * ClientHello - which we don't want - so we need to take that bit off. | |
1544 | */ | |
1545 | if (s->server) { | |
77815a02 MC |
1546 | PACKET hashprefix, msg; |
1547 | ||
1548 | /* Find how many bytes are left after the first two messages */ | |
1549 | if (!PACKET_buf_init(&hashprefix, hdata, hdatalen) | |
1550 | || !PACKET_forward(&hashprefix, 1) | |
1551 | || !PACKET_get_length_prefixed_3(&hashprefix, &msg) | |
1552 | || !PACKET_forward(&hashprefix, 1) | |
1553 | || !PACKET_get_length_prefixed_3(&hashprefix, &msg)) { | |
c48ffbcc | 1554 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
aff9929b MC |
1555 | goto err; |
1556 | } | |
77815a02 | 1557 | hdatalen -= PACKET_remaining(&hashprefix); |
aff9929b MC |
1558 | } |
1559 | ||
1560 | if (EVP_DigestUpdate(mctx, hdata, hdatalen) <= 0) { | |
c48ffbcc | 1561 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
aff9929b MC |
1562 | goto err; |
1563 | } | |
1564 | } | |
1565 | ||
1566 | if (EVP_DigestUpdate(mctx, msgstart, binderoffset) <= 0 | |
1053a6e2 | 1567 | || EVP_DigestFinal_ex(mctx, hash, NULL) <= 0) { |
c48ffbcc | 1568 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
1053a6e2 MC |
1569 | goto err; |
1570 | } | |
1571 | ||
d8652be0 MC |
1572 | mackey = EVP_PKEY_new_raw_private_key_ex(s->ctx->libctx, "HMAC", |
1573 | s->ctx->propq, finishedkey, | |
1574 | hashsize); | |
1053a6e2 | 1575 | if (mackey == NULL) { |
c48ffbcc | 1576 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
1053a6e2 MC |
1577 | goto err; |
1578 | } | |
1579 | ||
1580 | if (!sign) | |
1581 | binderout = tmpbinder; | |
1582 | ||
1583 | bindersize = hashsize; | |
d8652be0 MC |
1584 | if (EVP_DigestSignInit_ex(mctx, NULL, EVP_MD_name(md), s->ctx->libctx, |
1585 | s->ctx->propq, mackey) <= 0 | |
1053a6e2 MC |
1586 | || EVP_DigestSignUpdate(mctx, hash, hashsize) <= 0 |
1587 | || EVP_DigestSignFinal(mctx, binderout, &bindersize) <= 0 | |
1588 | || bindersize != hashsize) { | |
c48ffbcc | 1589 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
1053a6e2 MC |
1590 | goto err; |
1591 | } | |
1592 | ||
1593 | if (sign) { | |
1594 | ret = 1; | |
1595 | } else { | |
1596 | /* HMAC keys can't do EVP_DigestVerify* - use CRYPTO_memcmp instead */ | |
1597 | ret = (CRYPTO_memcmp(binderin, binderout, hashsize) == 0); | |
635c8f77 | 1598 | if (!ret) |
c48ffbcc | 1599 | SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_R_BINDER_DOES_NOT_VERIFY); |
1053a6e2 MC |
1600 | } |
1601 | ||
1602 | err: | |
1603 | OPENSSL_cleanse(binderkey, sizeof(binderkey)); | |
1604 | OPENSSL_cleanse(finishedkey, sizeof(finishedkey)); | |
1605 | EVP_PKEY_free(mackey); | |
1606 | EVP_MD_CTX_free(mctx); | |
1607 | ||
1608 | return ret; | |
1609 | } | |
38df5a45 | 1610 | |
f63a17d6 | 1611 | static int final_early_data(SSL *s, unsigned int context, int sent) |
38df5a45 | 1612 | { |
4be3a7c7 MC |
1613 | if (!sent) |
1614 | return 1; | |
1615 | ||
1616 | if (!s->server) { | |
1617 | if (context == SSL_EXT_TLS1_3_ENCRYPTED_EXTENSIONS | |
1618 | && sent | |
1619 | && !s->ext.early_data_ok) { | |
1620 | /* | |
1621 | * If we get here then the server accepted our early_data but we | |
1622 | * later realised that it shouldn't have done (e.g. inconsistent | |
1623 | * ALPN) | |
1624 | */ | |
c48ffbcc | 1625 | SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_R_BAD_EARLY_DATA); |
4be3a7c7 MC |
1626 | return 0; |
1627 | } | |
1628 | ||
38df5a45 | 1629 | return 1; |
4be3a7c7 | 1630 | } |
38df5a45 MC |
1631 | |
1632 | if (s->max_early_data == 0 | |
1633 | || !s->hit | |
38df5a45 MC |
1634 | || s->early_data_state != SSL_EARLY_DATA_ACCEPTING |
1635 | || !s->ext.early_data_ok | |
c9598459 | 1636 | || s->hello_retry_request != SSL_HRR_NONE |
59b2cb26 | 1637 | || (s->allow_early_data_cb != NULL |
1638 | && !s->allow_early_data_cb(s, | |
1639 | s->allow_early_data_cb_data))) { | |
38df5a45 MC |
1640 | s->ext.early_data = SSL_EARLY_DATA_REJECTED; |
1641 | } else { | |
1642 | s->ext.early_data = SSL_EARLY_DATA_ACCEPTED; | |
1643 | ||
1644 | if (!tls13_change_cipher_state(s, | |
1645 | SSL3_CC_EARLY | SSL3_CHANGE_CIPHER_SERVER_READ)) { | |
f63a17d6 | 1646 | /* SSLfatal() already called */ |
38df5a45 MC |
1647 | return 0; |
1648 | } | |
1649 | } | |
1650 | ||
1651 | return 1; | |
1652 | } | |
cf72c757 | 1653 | |
f63a17d6 | 1654 | static int final_maxfragmentlen(SSL *s, unsigned int context, int sent) |
cf72c757 F |
1655 | { |
1656 | /* | |
1657 | * Session resumption on server-side with MFL extension active | |
1658 | * BUT MFL extension packet was not resent (i.e. sent == 0) | |
1659 | */ | |
f63a17d6 | 1660 | if (s->server && s->hit && USE_MAX_FRAGMENT_LENGTH_EXT(s->session) |
cf72c757 | 1661 | && !sent ) { |
c48ffbcc | 1662 | SSLfatal(s, SSL_AD_MISSING_EXTENSION, SSL_R_BAD_EXTENSION); |
cf72c757 F |
1663 | return 0; |
1664 | } | |
1665 | ||
1666 | /* Current SSL buffer is lower than requested MFL */ | |
f63a17d6 MC |
1667 | if (s->session && USE_MAX_FRAGMENT_LENGTH_EXT(s->session) |
1668 | && s->max_send_fragment < GET_MAX_FRAGMENT_LENGTH(s->session)) | |
cf72c757 | 1669 | /* trigger a larger buffer reallocation */ |
f63a17d6 MC |
1670 | if (!ssl3_setup_buffers(s)) { |
1671 | /* SSLfatal() already called */ | |
cf72c757 | 1672 | return 0; |
f63a17d6 | 1673 | } |
cf72c757 F |
1674 | |
1675 | return 1; | |
1676 | } | |
9d75dce3 | 1677 | |
a7e6a3d8 | 1678 | static int init_post_handshake_auth(SSL *s, ossl_unused unsigned int context) |
9d75dce3 TS |
1679 | { |
1680 | s->post_handshake_auth = SSL_PHA_NONE; | |
1681 | ||
1682 | return 1; | |
1683 | } |