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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); | |
9d75dce3 | 65 | |
70af3d8e | 66 | /* Structure to define a built-in extension */ |
1266eefd MC |
67 | typedef struct extensions_definition_st { |
68 | /* The defined type for the extension */ | |
6b473aca | 69 | unsigned int type; |
1266eefd MC |
70 | /* |
71 | * The context that this extension applies to, e.g. what messages and | |
72 | * protocol versions | |
73 | */ | |
74 | unsigned int context; | |
68db4dda | 75 | /* |
805a2e9e MC |
76 | * Initialise extension before parsing. Always called for relevant contexts |
77 | * even if extension not present | |
68db4dda | 78 | */ |
38b051a1 | 79 | int (*init)(SSL_CONNECTION *s, unsigned int context); |
1266eefd | 80 | /* Parse extension sent from client to server */ |
38b051a1 TM |
81 | int (*parse_ctos)(SSL_CONNECTION *s, PACKET *pkt, unsigned int context, |
82 | X509 *x, size_t chainidx); | |
1266eefd | 83 | /* Parse extension send from server to client */ |
38b051a1 TM |
84 | int (*parse_stoc)(SSL_CONNECTION *s, PACKET *pkt, unsigned int context, |
85 | X509 *x, size_t chainidx); | |
1266eefd | 86 | /* Construct extension sent from server to client */ |
38b051a1 TM |
87 | EXT_RETURN (*construct_stoc)(SSL_CONNECTION *s, WPACKET *pkt, |
88 | unsigned int context, | |
f63a17d6 | 89 | X509 *x, size_t chainidx); |
1266eefd | 90 | /* Construct extension sent from client to server */ |
38b051a1 TM |
91 | EXT_RETURN (*construct_ctos)(SSL_CONNECTION *s, WPACKET *pkt, |
92 | unsigned int context, | |
f63a17d6 | 93 | X509 *x, size_t chainidx); |
68db4dda | 94 | /* |
805a2e9e MC |
95 | * Finalise extension after parsing. Always called where an extensions was |
96 | * initialised even if the extension was not present. |sent| is set to 1 if | |
97 | * the extension was seen, or 0 otherwise. | |
68db4dda | 98 | */ |
38b051a1 | 99 | int (*final)(SSL_CONNECTION *s, unsigned int context, int sent); |
6b473aca MC |
100 | } EXTENSION_DEFINITION; |
101 | ||
4b299b8e | 102 | /* |
70af3d8e | 103 | * Definitions of all built-in extensions. NOTE: Changes in the number or order |
bd91e3c8 | 104 | * of these extensions should be mirrored with equivalent changes to the |
706457b7 | 105 | * indexes ( TLSEXT_IDX_* ) defined in ssl_local.h. |
70af3d8e MC |
106 | * Each extension has an initialiser, a client and |
107 | * server side parser and a finaliser. The initialiser is called (if the | |
108 | * extension is relevant to the given context) even if we did not see the | |
109 | * extension in the message that we received. The parser functions are only | |
110 | * called if we see the extension in the message. The finalisers are always | |
111 | * called if the initialiser was called. | |
112 | * There are also server and client side constructor functions which are always | |
113 | * called during message construction if the extension is relevant for the | |
114 | * given context. | |
115 | * The initialisation, parsing, finalisation and construction functions are | |
116 | * always called in the order defined in this list. Some extensions may depend | |
117 | * on others having been processed first, so the order of this list is | |
118 | * significant. | |
119 | * The extension context is defined by a series of flags which specify which | |
120 | * messages the extension is relevant to. These flags also specify whether the | |
3e6c1da8 | 121 | * extension is relevant to a particular protocol or protocol version. |
a1448c26 | 122 | * |
10ed1b72 TS |
123 | * NOTE: WebSphere Application Server 7+ cannot handle empty extensions at |
124 | * the end, keep these extensions before signature_algorithm. | |
4b299b8e | 125 | */ |
0785274c | 126 | #define INVALID_EXTENSION { 0x10000, 0, NULL, NULL, NULL, NULL, NULL, NULL } |
6b473aca MC |
127 | static const EXTENSION_DEFINITION ext_defs[] = { |
128 | { | |
129 | TLSEXT_TYPE_renegotiate, | |
fe874d27 MC |
130 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO |
131 | | SSL_EXT_SSL3_ALLOWED | SSL_EXT_TLS1_2_AND_BELOW_ONLY, | |
1266eefd MC |
132 | NULL, tls_parse_ctos_renegotiate, tls_parse_stoc_renegotiate, |
133 | tls_construct_stoc_renegotiate, tls_construct_ctos_renegotiate, | |
134 | final_renegotiate | |
6b473aca MC |
135 | }, |
136 | { | |
137 | TLSEXT_TYPE_server_name, | |
fe874d27 MC |
138 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO |
139 | | SSL_EXT_TLS1_3_ENCRYPTED_EXTENSIONS, | |
1266eefd MC |
140 | init_server_name, |
141 | tls_parse_ctos_server_name, tls_parse_stoc_server_name, | |
142 | tls_construct_stoc_server_name, tls_construct_ctos_server_name, | |
143 | final_server_name | |
6b473aca | 144 | }, |
cf72c757 F |
145 | { |
146 | TLSEXT_TYPE_max_fragment_length, | |
147 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO | |
148 | | SSL_EXT_TLS1_3_ENCRYPTED_EXTENSIONS, | |
149 | NULL, tls_parse_ctos_maxfragmentlen, tls_parse_stoc_maxfragmentlen, | |
150 | tls_construct_stoc_maxfragmentlen, tls_construct_ctos_maxfragmentlen, | |
151 | final_maxfragmentlen | |
152 | }, | |
6b473aca MC |
153 | #ifndef OPENSSL_NO_SRP |
154 | { | |
155 | TLSEXT_TYPE_srp, | |
fe874d27 | 156 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_AND_BELOW_ONLY, |
1266eefd | 157 | init_srp, tls_parse_ctos_srp, NULL, NULL, tls_construct_ctos_srp, NULL |
6b473aca | 158 | }, |
0785274c MC |
159 | #else |
160 | INVALID_EXTENSION, | |
6b473aca | 161 | #endif |
6b473aca MC |
162 | { |
163 | TLSEXT_TYPE_ec_point_formats, | |
fe874d27 MC |
164 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO |
165 | | SSL_EXT_TLS1_2_AND_BELOW_ONLY, | |
3f987381 | 166 | init_ec_point_formats, tls_parse_ctos_ec_pt_formats, tls_parse_stoc_ec_pt_formats, |
1266eefd MC |
167 | tls_construct_stoc_ec_pt_formats, tls_construct_ctos_ec_pt_formats, |
168 | final_ec_pt_formats | |
6b473aca MC |
169 | }, |
170 | { | |
7bc2bddb BK |
171 | /* |
172 | * "supported_groups" is spread across several specifications. | |
173 | * It was originally specified as "elliptic_curves" in RFC 4492, | |
174 | * and broadened to include named FFDH groups by RFC 7919. | |
175 | * Both RFCs 4492 and 7919 do not include a provision for the server | |
176 | * to indicate to the client the complete list of groups supported | |
177 | * by the server, with the server instead just indicating the | |
178 | * selected group for this connection in the ServerKeyExchange | |
179 | * message. TLS 1.3 adds a scheme for the server to indicate | |
180 | * to the client its list of supported groups in the | |
181 | * EncryptedExtensions message, but none of the relevant | |
182 | * specifications permit sending supported_groups in the ServerHello. | |
183 | * Nonetheless (possibly due to the close proximity to the | |
184 | * "ec_point_formats" extension, which is allowed in the ServerHello), | |
185 | * there are several servers that send this extension in the | |
186 | * ServerHello anyway. Up to and including the 1.1.0 release, | |
187 | * we did not check for the presence of nonpermitted extensions, | |
188 | * so to avoid a regression, we must permit this extension in the | |
189 | * TLS 1.2 ServerHello as well. | |
190 | * | |
191 | * Note that there is no tls_parse_stoc_supported_groups function, | |
192 | * so we do not perform any additional parsing, validation, or | |
193 | * processing on the server's group list -- this is just a minimal | |
194 | * change to preserve compatibility with these misbehaving servers. | |
195 | */ | |
6b473aca | 196 | TLSEXT_TYPE_supported_groups, |
7bc2bddb BK |
197 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_3_ENCRYPTED_EXTENSIONS |
198 | | SSL_EXT_TLS1_2_SERVER_HELLO, | |
1266eefd | 199 | NULL, tls_parse_ctos_supported_groups, NULL, |
6af87546 | 200 | tls_construct_stoc_supported_groups, |
1266eefd | 201 | tls_construct_ctos_supported_groups, NULL |
6b473aca | 202 | }, |
6b473aca MC |
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, |
efe0f315 | 389 | tls_construct_ctos_psk, final_psk |
6b473aca MC |
390 | } |
391 | }; | |
392 | ||
43ae5eed | 393 | /* Check whether an extension's context matches the current context */ |
38b051a1 TM |
394 | static int validate_context(SSL_CONNECTION *s, unsigned int extctx, |
395 | unsigned int thisctx) | |
43ae5eed MC |
396 | { |
397 | /* Check we're allowed to use this extension in this context */ | |
398 | if ((thisctx & extctx) == 0) | |
399 | return 0; | |
400 | ||
38b051a1 | 401 | if (SSL_CONNECTION_IS_DTLS(s)) { |
43ae5eed MC |
402 | if ((extctx & SSL_EXT_TLS_ONLY) != 0) |
403 | return 0; | |
404 | } else if ((extctx & SSL_EXT_DTLS_ONLY) != 0) { | |
405 | return 0; | |
406 | } | |
407 | ||
408 | return 1; | |
409 | } | |
410 | ||
38b051a1 TM |
411 | int tls_validate_all_contexts(SSL_CONNECTION *s, unsigned int thisctx, |
412 | RAW_EXTENSION *exts) | |
88050dd1 MC |
413 | { |
414 | size_t i, num_exts, builtin_num = OSSL_NELEM(ext_defs), offset; | |
415 | RAW_EXTENSION *thisext; | |
416 | unsigned int context; | |
417 | ENDPOINT role = ENDPOINT_BOTH; | |
418 | ||
419 | if ((thisctx & SSL_EXT_CLIENT_HELLO) != 0) | |
420 | role = ENDPOINT_SERVER; | |
421 | else if ((thisctx & SSL_EXT_TLS1_2_SERVER_HELLO) != 0) | |
422 | role = ENDPOINT_CLIENT; | |
423 | ||
424 | /* Calculate the number of extensions in the extensions list */ | |
425 | num_exts = builtin_num + s->cert->custext.meths_count; | |
426 | ||
427 | for (thisext = exts, i = 0; i < num_exts; i++, thisext++) { | |
428 | if (!thisext->present) | |
429 | continue; | |
430 | ||
431 | if (i < builtin_num) { | |
432 | context = ext_defs[i].context; | |
433 | } else { | |
434 | custom_ext_method *meth = NULL; | |
435 | ||
436 | meth = custom_ext_find(&s->cert->custext, role, thisext->type, | |
437 | &offset); | |
438 | if (!ossl_assert(meth != NULL)) | |
439 | return 0; | |
440 | context = meth->context; | |
441 | } | |
442 | ||
443 | if (!validate_context(s, context, thisctx)) | |
444 | return 0; | |
445 | } | |
446 | ||
447 | return 1; | |
448 | } | |
449 | ||
6b473aca MC |
450 | /* |
451 | * Verify whether we are allowed to use the extension |type| in the current | |
452 | * |context|. Returns 1 to indicate the extension is allowed or unknown or 0 to | |
70af3d8e | 453 | * indicate the extension is not allowed. If returning 1 then |*found| is set to |
69687aa8 | 454 | * the definition for the extension we found. |
6b473aca | 455 | */ |
38b051a1 TM |
456 | static int verify_extension(SSL_CONNECTION *s, unsigned int context, |
457 | unsigned int type, custom_ext_methods *meths, | |
458 | RAW_EXTENSION *rawexlist, RAW_EXTENSION **found) | |
6b473aca MC |
459 | { |
460 | size_t i; | |
70af3d8e | 461 | size_t builtin_num = OSSL_NELEM(ext_defs); |
d270de32 | 462 | const EXTENSION_DEFINITION *thisext; |
6b473aca | 463 | |
1266eefd MC |
464 | for (i = 0, thisext = ext_defs; i < builtin_num; i++, thisext++) { |
465 | if (type == thisext->type) { | |
43ae5eed | 466 | if (!validate_context(s, thisext->context, context)) |
6b473aca MC |
467 | return 0; |
468 | ||
1266eefd | 469 | *found = &rawexlist[i]; |
6b473aca MC |
470 | return 1; |
471 | } | |
472 | } | |
473 | ||
70af3d8e MC |
474 | /* Check the custom extensions */ |
475 | if (meths != NULL) { | |
43ae5eed | 476 | size_t offset = 0; |
787d9ec7 | 477 | ENDPOINT role = ENDPOINT_BOTH; |
43ae5eed MC |
478 | custom_ext_method *meth = NULL; |
479 | ||
480 | if ((context & SSL_EXT_CLIENT_HELLO) != 0) | |
787d9ec7 | 481 | role = ENDPOINT_SERVER; |
43ae5eed | 482 | else if ((context & SSL_EXT_TLS1_2_SERVER_HELLO) != 0) |
787d9ec7 | 483 | role = ENDPOINT_CLIENT; |
43ae5eed | 484 | |
787d9ec7 | 485 | meth = custom_ext_find(meths, role, type, &offset); |
43ae5eed MC |
486 | if (meth != NULL) { |
487 | if (!validate_context(s, meth->context, context)) | |
488 | return 0; | |
489 | *found = &rawexlist[offset + builtin_num]; | |
490 | return 1; | |
6b473aca MC |
491 | } |
492 | } | |
493 | ||
70af3d8e | 494 | /* Unknown extension. We allow it */ |
1266eefd | 495 | *found = NULL; |
70af3d8e | 496 | return 1; |
6b473aca MC |
497 | } |
498 | ||
70af3d8e MC |
499 | /* |
500 | * Check whether the context defined for an extension |extctx| means whether | |
501 | * the extension is relevant for the current context |thisctx| or not. Returns | |
502 | * 1 if the extension is relevant for this context, and 0 otherwise | |
503 | */ | |
38b051a1 TM |
504 | int extension_is_relevant(SSL_CONNECTION *s, unsigned int extctx, |
505 | unsigned int thisctx) | |
805a2e9e | 506 | { |
a2b97bdf MC |
507 | int is_tls13; |
508 | ||
509 | /* | |
510 | * For HRR we haven't selected the version yet but we know it will be | |
511 | * TLSv1.3 | |
512 | */ | |
513 | if ((thisctx & SSL_EXT_TLS1_3_HELLO_RETRY_REQUEST) != 0) | |
514 | is_tls13 = 1; | |
515 | else | |
38b051a1 | 516 | is_tls13 = SSL_CONNECTION_IS_TLS13(s); |
a2b97bdf | 517 | |
38b051a1 | 518 | if ((SSL_CONNECTION_IS_DTLS(s) |
fe874d27 | 519 | && (extctx & SSL_EXT_TLS_IMPLEMENTATION_ONLY) != 0) |
805a2e9e | 520 | || (s->version == SSL3_VERSION |
fe874d27 | 521 | && (extctx & SSL_EXT_SSL3_ALLOWED) == 0) |
ee36b963 BK |
522 | /* |
523 | * Note that SSL_IS_TLS13() means "TLS 1.3 has been negotiated", | |
524 | * which is never true when generating the ClientHello. | |
525 | * However, version negotiation *has* occurred by the time the | |
526 | * ClientHello extensions are being parsed. | |
527 | * Be careful to allow TLS 1.3-only extensions when generating | |
528 | * the ClientHello. | |
529 | */ | |
a2b97bdf | 530 | || (is_tls13 && (extctx & SSL_EXT_TLS1_2_AND_BELOW_ONLY) != 0) |
ee36b963 BK |
531 | || (!is_tls13 && (extctx & SSL_EXT_TLS1_3_ONLY) != 0 |
532 | && (thisctx & SSL_EXT_CLIENT_HELLO) == 0) | |
533 | || (s->server && !is_tls13 && (extctx & SSL_EXT_TLS1_3_ONLY) != 0) | |
43ae5eed | 534 | || (s->hit && (extctx & SSL_EXT_IGNORE_ON_RESUMPTION) != 0)) |
805a2e9e | 535 | return 0; |
805a2e9e MC |
536 | return 1; |
537 | } | |
538 | ||
6b473aca MC |
539 | /* |
540 | * Gather a list of all the extensions from the data in |packet]. |context| | |
70af3d8e | 541 | * tells us which message this extension is for. The raw extension data is |
29bfd5b7 MC |
542 | * stored in |*res| on success. We don't actually process the content of the |
543 | * extensions yet, except to check their types. This function also runs the | |
544 | * initialiser functions for all known extensions if |init| is nonzero (whether | |
545 | * we have collected them or not). If successful the caller is responsible for | |
546 | * freeing the contents of |*res|. | |
6b473aca MC |
547 | * |
548 | * Per http://tools.ietf.org/html/rfc5246#section-7.4.1.4, there may not be | |
549 | * more than one extension of the same type in a ClientHello or ServerHello. | |
550 | * This function returns 1 if all extensions are unique and we have parsed their | |
551 | * types, and 0 if the extensions contain duplicates, could not be successfully | |
1266eefd | 552 | * found, or an internal error occurred. We only check duplicates for |
70af3d8e | 553 | * extensions that we know about. We ignore others. |
6b473aca | 554 | */ |
38b051a1 TM |
555 | int tls_collect_extensions(SSL_CONNECTION *s, PACKET *packet, |
556 | unsigned int context, | |
f63a17d6 | 557 | RAW_EXTENSION **res, size_t *len, int init) |
6b473aca MC |
558 | { |
559 | PACKET extensions = *packet; | |
d270de32 | 560 | size_t i = 0; |
fc5ece2e | 561 | size_t num_exts; |
43ae5eed | 562 | custom_ext_methods *exts = &s->cert->custext; |
6b473aca | 563 | RAW_EXTENSION *raw_extensions = NULL; |
d270de32 | 564 | const EXTENSION_DEFINITION *thisexd; |
6b473aca | 565 | |
ecc2f938 MC |
566 | *res = NULL; |
567 | ||
70af3d8e MC |
568 | /* |
569 | * Initialise server side custom extensions. Client side is done during | |
570 | * construction of extensions for the ClientHello. | |
571 | */ | |
43ae5eed MC |
572 | if ((context & SSL_EXT_CLIENT_HELLO) != 0) |
573 | custom_ext_init(&s->cert->custext); | |
70af3d8e | 574 | |
fc5ece2e BK |
575 | num_exts = OSSL_NELEM(ext_defs) + (exts != NULL ? exts->meths_count : 0); |
576 | raw_extensions = OPENSSL_zalloc(num_exts * sizeof(*raw_extensions)); | |
70af3d8e | 577 | if (raw_extensions == NULL) { |
c48ffbcc | 578 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_MALLOC_FAILURE); |
70af3d8e MC |
579 | return 0; |
580 | } | |
581 | ||
193b5d76 | 582 | i = 0; |
6b473aca | 583 | while (PACKET_remaining(&extensions) > 0) { |
b186a592 | 584 | unsigned int type, idx; |
6b473aca | 585 | PACKET extension; |
1266eefd | 586 | RAW_EXTENSION *thisex; |
6b473aca MC |
587 | |
588 | if (!PACKET_get_net_2(&extensions, &type) || | |
589 | !PACKET_get_length_prefixed_2(&extensions, &extension)) { | |
c48ffbcc | 590 | SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_R_BAD_EXTENSION); |
6b473aca MC |
591 | goto err; |
592 | } | |
70af3d8e MC |
593 | /* |
594 | * Verify this extension is allowed. We only check duplicates for | |
652a6b7e MC |
595 | * extensions that we recognise. We also have a special case for the |
596 | * PSK extension, which must be the last one in the ClientHello. | |
70af3d8e | 597 | */ |
1266eefd | 598 | if (!verify_extension(s, context, type, exts, raw_extensions, &thisex) |
652a6b7e MC |
599 | || (thisex != NULL && thisex->present == 1) |
600 | || (type == TLSEXT_TYPE_psk | |
fe874d27 | 601 | && (context & SSL_EXT_CLIENT_HELLO) != 0 |
652a6b7e | 602 | && PACKET_remaining(&extensions) != 0)) { |
c48ffbcc | 603 | SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_R_BAD_EXTENSION); |
6b473aca MC |
604 | goto err; |
605 | } | |
b186a592 MC |
606 | idx = thisex - raw_extensions; |
607 | /*- | |
608 | * Check that we requested this extension (if appropriate). Requests can | |
609 | * be sent in the ClientHello and CertificateRequest. Unsolicited | |
610 | * extensions can be sent in the NewSessionTicket. We only do this for | |
611 | * the built-in extensions. Custom extensions have a different but | |
612 | * similar check elsewhere. | |
613 | * Special cases: | |
614 | * - The HRR cookie extension is unsolicited | |
615 | * - The renegotiate extension is unsolicited (the client signals | |
616 | * support via an SCSV) | |
617 | * - The signed_certificate_timestamp extension can be provided by a | |
618 | * custom extension or by the built-in version. We let the extension | |
619 | * itself handle unsolicited response checks. | |
620 | */ | |
621 | if (idx < OSSL_NELEM(ext_defs) | |
622 | && (context & (SSL_EXT_CLIENT_HELLO | |
623 | | SSL_EXT_TLS1_3_CERTIFICATE_REQUEST | |
624 | | SSL_EXT_TLS1_3_NEW_SESSION_TICKET)) == 0 | |
625 | && type != TLSEXT_TYPE_cookie | |
626 | && type != TLSEXT_TYPE_renegotiate | |
627 | && type != TLSEXT_TYPE_signed_certificate_timestamp | |
673e0bbb DB |
628 | && (s->ext.extflags[idx] & SSL_EXT_FLAG_SENT) == 0 |
629 | #ifndef OPENSSL_NO_GOST | |
630 | && !((context & SSL_EXT_TLS1_2_SERVER_HELLO) != 0 | |
631 | && type == TLSEXT_TYPE_cryptopro_bug) | |
632 | #endif | |
dd6b2706 | 633 | ) { |
f63a17d6 | 634 | SSLfatal(s, SSL_AD_UNSUPPORTED_EXTENSION, |
c48ffbcc | 635 | SSL_R_UNSOLICITED_EXTENSION); |
b186a592 MC |
636 | goto err; |
637 | } | |
1266eefd MC |
638 | if (thisex != NULL) { |
639 | thisex->data = extension; | |
640 | thisex->present = 1; | |
641 | thisex->type = type; | |
193b5d76 | 642 | thisex->received_order = i++; |
b93a295a | 643 | if (s->ext.debug_cb) |
38b051a1 TM |
644 | s->ext.debug_cb(SSL_CONNECTION_GET_SSL(s), !s->server, |
645 | thisex->type, PACKET_data(&thisex->data), | |
b93a295a TS |
646 | PACKET_remaining(&thisex->data), |
647 | s->ext.debug_arg); | |
6b473aca MC |
648 | } |
649 | } | |
650 | ||
735d5b59 TT |
651 | if (init) { |
652 | /* | |
653 | * Initialise all known extensions relevant to this context, | |
654 | * whether we have found them or not | |
655 | */ | |
656 | for (thisexd = ext_defs, i = 0; i < OSSL_NELEM(ext_defs); | |
657 | i++, thisexd++) { | |
bf5c84f5 TT |
658 | if (thisexd->init != NULL && (thisexd->context & context) != 0 |
659 | && extension_is_relevant(s, thisexd->context, context) | |
660 | && !thisexd->init(s, context)) { | |
f63a17d6 | 661 | /* SSLfatal() already called */ |
735d5b59 TT |
662 | goto err; |
663 | } | |
68db4dda MC |
664 | } |
665 | } | |
666 | ||
6b473aca | 667 | *res = raw_extensions; |
fc5ece2e BK |
668 | if (len != NULL) |
669 | *len = num_exts; | |
6b473aca MC |
670 | return 1; |
671 | ||
672 | err: | |
673 | OPENSSL_free(raw_extensions); | |
674 | return 0; | |
675 | } | |
676 | ||
68db4dda | 677 | /* |
70af3d8e MC |
678 | * Runs the parser for a given extension with index |idx|. |exts| contains the |
679 | * list of all parsed extensions previously collected by | |
680 | * tls_collect_extensions(). The parser is only run if it is applicable for the | |
f97d4c37 MC |
681 | * given |context| and the parser has not already been run. If this is for a |
682 | * Certificate message, then we also provide the parser with the relevant | |
8521ced6 | 683 | * Certificate |x| and its position in the |chainidx| with 0 being the first |
29bfd5b7 MC |
684 | * Certificate. Returns 1 on success or 0 on failure. If an extension is not |
685 | * present this counted as success. | |
68db4dda | 686 | */ |
38b051a1 | 687 | int tls_parse_extension(SSL_CONNECTION *s, TLSEXT_INDEX idx, int context, |
f63a17d6 | 688 | RAW_EXTENSION *exts, X509 *x, size_t chainidx) |
6b473aca | 689 | { |
70af3d8e | 690 | RAW_EXTENSION *currext = &exts[idx]; |
38b051a1 | 691 | int (*parser)(SSL_CONNECTION *s, PACKET *pkt, unsigned int context, X509 *x, |
f63a17d6 | 692 | size_t chainidx) = NULL; |
6b473aca | 693 | |
70af3d8e MC |
694 | /* Skip if the extension is not present */ |
695 | if (!currext->present) | |
696 | return 1; | |
6b473aca | 697 | |
70af3d8e MC |
698 | /* Skip if we've already parsed this extension */ |
699 | if (currext->parsed) | |
700 | return 1; | |
6b473aca | 701 | |
70af3d8e MC |
702 | currext->parsed = 1; |
703 | ||
704 | if (idx < OSSL_NELEM(ext_defs)) { | |
705 | /* We are handling a built-in extension */ | |
706 | const EXTENSION_DEFINITION *extdef = &ext_defs[idx]; | |
707 | ||
708 | /* Check if extension is defined for our protocol. If not, skip */ | |
709 | if (!extension_is_relevant(s, extdef->context, context)) | |
710 | return 1; | |
711 | ||
1266eefd | 712 | parser = s->server ? extdef->parse_ctos : extdef->parse_stoc; |
224135e9 | 713 | |
1266eefd | 714 | if (parser != NULL) |
f63a17d6 | 715 | return parser(s, &currext->data, context, x, chainidx); |
6b473aca | 716 | |
70af3d8e MC |
717 | /* |
718 | * If the parser is NULL we fall through to the custom extension | |
719 | * processing | |
720 | */ | |
6b473aca MC |
721 | } |
722 | ||
43ae5eed | 723 | /* Parse custom extensions */ |
f63a17d6 MC |
724 | return custom_ext_parse(s, context, currext->type, |
725 | PACKET_data(&currext->data), | |
726 | PACKET_remaining(&currext->data), | |
727 | x, chainidx); | |
805a2e9e MC |
728 | } |
729 | ||
730 | /* | |
731 | * Parse all remaining extensions that have not yet been parsed. Also calls the | |
735d5b59 TT |
732 | * finalisation for all extensions at the end if |fin| is nonzero, whether we |
733 | * collected them or not. Returns 1 for success or 0 for failure. If we are | |
734 | * working on a Certificate message then we also pass the Certificate |x| and | |
29bfd5b7 | 735 | * its position in the |chainidx|, with 0 being the first certificate. |
805a2e9e | 736 | */ |
38b051a1 TM |
737 | int tls_parse_all_extensions(SSL_CONNECTION *s, int context, |
738 | RAW_EXTENSION *exts, X509 *x, | |
f63a17d6 | 739 | size_t chainidx, int fin) |
805a2e9e | 740 | { |
1266eefd | 741 | size_t i, numexts = OSSL_NELEM(ext_defs); |
d270de32 | 742 | const EXTENSION_DEFINITION *thisexd; |
805a2e9e | 743 | |
70af3d8e | 744 | /* Calculate the number of extensions in the extensions list */ |
43ae5eed | 745 | numexts += s->cert->custext.meths_count; |
70af3d8e MC |
746 | |
747 | /* Parse each extension in turn */ | |
1266eefd | 748 | for (i = 0; i < numexts; i++) { |
f63a17d6 MC |
749 | if (!tls_parse_extension(s, i, context, exts, x, chainidx)) { |
750 | /* SSLfatal() already called */ | |
70af3d8e | 751 | return 0; |
f63a17d6 | 752 | } |
70af3d8e | 753 | } |
805a2e9e | 754 | |
735d5b59 TT |
755 | if (fin) { |
756 | /* | |
757 | * Finalise all known extensions relevant to this context, | |
758 | * whether we have found them or not | |
759 | */ | |
760 | for (i = 0, thisexd = ext_defs; i < OSSL_NELEM(ext_defs); | |
761 | i++, thisexd++) { | |
bf5c84f5 | 762 | if (thisexd->final != NULL && (thisexd->context & context) != 0 |
f63a17d6 MC |
763 | && !thisexd->final(s, context, exts[i].present)) { |
764 | /* SSLfatal() already called */ | |
735d5b59 | 765 | return 0; |
f63a17d6 | 766 | } |
735d5b59 | 767 | } |
68db4dda MC |
768 | } |
769 | ||
6b473aca MC |
770 | return 1; |
771 | } | |
772 | ||
38b051a1 TM |
773 | int should_add_extension(SSL_CONNECTION *s, unsigned int extctx, |
774 | unsigned int thisctx, int max_version) | |
43ae5eed MC |
775 | { |
776 | /* Skip if not relevant for our context */ | |
777 | if ((extctx & thisctx) == 0) | |
778 | return 0; | |
779 | ||
780 | /* Check if this extension is defined for our protocol. If not, skip */ | |
ee36b963 | 781 | if (!extension_is_relevant(s, extctx, thisctx) |
43ae5eed MC |
782 | || ((extctx & SSL_EXT_TLS1_3_ONLY) != 0 |
783 | && (thisctx & SSL_EXT_CLIENT_HELLO) != 0 | |
38b051a1 | 784 | && (SSL_CONNECTION_IS_DTLS(s) || max_version < TLS1_3_VERSION))) |
43ae5eed MC |
785 | return 0; |
786 | ||
787 | return 1; | |
788 | } | |
789 | ||
6b473aca | 790 | /* |
70af3d8e | 791 | * Construct all the extensions relevant to the current |context| and write |
30aeba43 | 792 | * them to |pkt|. If this is an extension for a Certificate in a Certificate |
8521ced6 MC |
793 | * message, then |x| will be set to the Certificate we are handling, and |
794 | * |chainidx| will indicate the position in the chainidx we are processing (with | |
f63a17d6 | 795 | * 0 being the first in the chain). Returns 1 on success or 0 on failure. On a |
8521ced6 | 796 | * failure construction stops at the first extension to fail to construct. |
6b473aca | 797 | */ |
38b051a1 TM |
798 | int tls_construct_extensions(SSL_CONNECTION *s, WPACKET *pkt, |
799 | unsigned int context, | |
f63a17d6 | 800 | X509 *x, size_t chainidx) |
224135e9 | 801 | { |
1266eefd | 802 | size_t i; |
f63a17d6 | 803 | int min_version, max_version = 0, reason; |
d270de32 | 804 | const EXTENSION_DEFINITION *thisexd; |
224135e9 MC |
805 | |
806 | if (!WPACKET_start_sub_packet_u16(pkt) | |
807 | /* | |
808 | * If extensions are of zero length then we don't even add the | |
1c259bb5 BK |
809 | * extensions length bytes to a ClientHello/ServerHello |
810 | * (for non-TLSv1.3). | |
224135e9 | 811 | */ |
fe874d27 MC |
812 | || ((context & |
813 | (SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO)) != 0 | |
fe874d27 | 814 | && !WPACKET_set_flags(pkt, |
224135e9 | 815 | WPACKET_FLAGS_ABANDON_ON_ZERO_LENGTH))) { |
c48ffbcc | 816 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
f63a17d6 | 817 | return 0; |
224135e9 MC |
818 | } |
819 | ||
fe874d27 | 820 | if ((context & SSL_EXT_CLIENT_HELLO) != 0) { |
b5b993b2 | 821 | reason = ssl_get_min_max_version(s, &min_version, &max_version, NULL); |
ab83e314 | 822 | if (reason != 0) { |
c48ffbcc | 823 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, reason); |
f63a17d6 | 824 | return 0; |
ab83e314 MC |
825 | } |
826 | } | |
827 | ||
828 | /* Add custom extensions first */ | |
fe874d27 | 829 | if ((context & SSL_EXT_CLIENT_HELLO) != 0) { |
44e69951 | 830 | /* On the server side with initialise during ClientHello parsing */ |
43ae5eed | 831 | custom_ext_init(&s->cert->custext); |
ab83e314 | 832 | } |
f63a17d6 MC |
833 | if (!custom_ext_add(s, context, pkt, x, chainidx, max_version)) { |
834 | /* SSLfatal() already called */ | |
835 | return 0; | |
ab83e314 MC |
836 | } |
837 | ||
1266eefd | 838 | for (i = 0, thisexd = ext_defs; i < OSSL_NELEM(ext_defs); i++, thisexd++) { |
38b051a1 TM |
839 | EXT_RETURN (*construct)(SSL_CONNECTION *s, WPACKET *pkt, |
840 | unsigned int context, | |
f63a17d6 | 841 | X509 *x, size_t chainidx); |
b186a592 | 842 | EXT_RETURN ret; |
4b299b8e | 843 | |
224135e9 | 844 | /* Skip if not relevant for our context */ |
43ae5eed | 845 | if (!should_add_extension(s, thisexd->context, context, max_version)) |
224135e9 MC |
846 | continue; |
847 | ||
1266eefd MC |
848 | construct = s->server ? thisexd->construct_stoc |
849 | : thisexd->construct_ctos; | |
224135e9 | 850 | |
43ae5eed | 851 | if (construct == NULL) |
224135e9 MC |
852 | continue; |
853 | ||
f63a17d6 MC |
854 | ret = construct(s, pkt, context, x, chainidx); |
855 | if (ret == EXT_RETURN_FAIL) { | |
856 | /* SSLfatal() already called */ | |
857 | return 0; | |
858 | } | |
b186a592 MC |
859 | if (ret == EXT_RETURN_SENT |
860 | && (context & (SSL_EXT_CLIENT_HELLO | |
861 | | SSL_EXT_TLS1_3_CERTIFICATE_REQUEST | |
862 | | SSL_EXT_TLS1_3_NEW_SESSION_TICKET)) != 0) | |
863 | s->ext.extflags[i] |= SSL_EXT_FLAG_SENT; | |
224135e9 MC |
864 | } |
865 | ||
224135e9 | 866 | if (!WPACKET_close(pkt)) { |
c48ffbcc | 867 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
f63a17d6 | 868 | return 0; |
224135e9 MC |
869 | } |
870 | ||
871 | return 1; | |
872 | } | |
805a2e9e | 873 | |
70af3d8e MC |
874 | /* |
875 | * Built in extension finalisation and initialisation functions. All initialise | |
876 | * or finalise the associated extension type for the given |context|. For | |
877 | * finalisers |sent| is set to 1 if we saw the extension during parsing, and 0 | |
29bfd5b7 | 878 | * otherwise. These functions return 1 on success or 0 on failure. |
70af3d8e MC |
879 | */ |
880 | ||
38b051a1 | 881 | static int final_renegotiate(SSL_CONNECTION *s, unsigned int context, int sent) |
805a2e9e | 882 | { |
332eb390 MC |
883 | if (!s->server) { |
884 | /* | |
885 | * Check if we can connect to a server that doesn't support safe | |
886 | * renegotiation | |
887 | */ | |
888 | if (!(s->options & SSL_OP_LEGACY_SERVER_CONNECT) | |
889 | && !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION) | |
890 | && !sent) { | |
c48ffbcc | 891 | SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE, |
f63a17d6 | 892 | SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED); |
332eb390 MC |
893 | return 0; |
894 | } | |
895 | ||
805a2e9e | 896 | return 1; |
332eb390 | 897 | } |
805a2e9e MC |
898 | |
899 | /* Need RI if renegotiating */ | |
900 | if (s->renegotiate | |
901 | && !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION) | |
902 | && !sent) { | |
c48ffbcc | 903 | SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE, |
f63a17d6 | 904 | SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED); |
805a2e9e MC |
905 | return 0; |
906 | } | |
907 | ||
332eb390 | 908 | |
805a2e9e MC |
909 | return 1; |
910 | } | |
911 | ||
acce0557 P |
912 | static ossl_inline void ssl_tsan_decr(const SSL_CTX *ctx, |
913 | TSAN_QUALIFIER int *stat) | |
914 | { | |
915 | if (ssl_tsan_lock(ctx)) { | |
916 | tsan_decr(stat); | |
917 | ssl_tsan_unlock(ctx); | |
918 | } | |
919 | } | |
920 | ||
38b051a1 | 921 | static int init_server_name(SSL_CONNECTION *s, unsigned int context) |
805a2e9e | 922 | { |
f01344cb | 923 | if (s->server) { |
805a2e9e MC |
924 | s->servername_done = 0; |
925 | ||
f01344cb MC |
926 | OPENSSL_free(s->ext.hostname); |
927 | s->ext.hostname = NULL; | |
928 | } | |
929 | ||
805a2e9e MC |
930 | return 1; |
931 | } | |
932 | ||
38b051a1 | 933 | static int final_server_name(SSL_CONNECTION *s, unsigned int context, int sent) |
805a2e9e | 934 | { |
9ef9088c | 935 | int ret = SSL_TLSEXT_ERR_NOACK; |
805a2e9e | 936 | int altmp = SSL_AD_UNRECOGNIZED_NAME; |
38b051a1 TM |
937 | SSL *ssl = SSL_CONNECTION_GET_SSL(s); |
938 | SSL_CTX *sctx = SSL_CONNECTION_GET_CTX(s); | |
939 | int was_ticket = (SSL_get_options(ssl) & SSL_OP_NO_TICKET) == 0; | |
805a2e9e | 940 | |
38b051a1 | 941 | if (!ossl_assert(sctx != NULL) || !ossl_assert(s->session_ctx != NULL)) { |
c48ffbcc | 942 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
c4715212 MC |
943 | return 0; |
944 | } | |
945 | ||
38b051a1 TM |
946 | if (sctx->ext.servername_cb != NULL) |
947 | ret = sctx->ext.servername_cb(ssl, &altmp, | |
948 | sctx->ext.servername_arg); | |
c4715212 | 949 | else if (s->session_ctx->ext.servername_cb != NULL) |
38b051a1 | 950 | ret = s->session_ctx->ext.servername_cb(ssl, &altmp, |
222da979 | 951 | s->session_ctx->ext.servername_arg); |
805a2e9e | 952 | |
1c4aa31d BK |
953 | /* |
954 | * For servers, propagate the SNI hostname from the temporary | |
955 | * storage in the SSL to the persistent SSL_SESSION, now that we | |
956 | * know we accepted it. | |
957 | * Clients make this copy when parsing the server's response to | |
958 | * the extension, which is when they find out that the negotiation | |
959 | * was successful. | |
960 | */ | |
961 | if (s->server) { | |
2a538551 | 962 | if (sent && ret == SSL_TLSEXT_ERR_OK && !s->hit) { |
1c4aa31d BK |
963 | /* Only store the hostname in the session if we accepted it. */ |
964 | OPENSSL_free(s->session->ext.hostname); | |
965 | s->session->ext.hostname = OPENSSL_strdup(s->ext.hostname); | |
966 | if (s->session->ext.hostname == NULL && s->ext.hostname != NULL) { | |
c48ffbcc | 967 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
1c4aa31d BK |
968 | } |
969 | } | |
9fb6cb81 MC |
970 | } |
971 | ||
3be08e30 BK |
972 | /* |
973 | * If we switched contexts (whether here or in the client_hello callback), | |
974 | * move the sess_accept increment from the session_ctx to the new | |
975 | * context, to avoid the confusing situation of having sess_accept_good | |
976 | * exceed sess_accept (zero) for the new context. | |
977 | */ | |
38b051a1 | 978 | if (SSL_IS_FIRST_HANDSHAKE(s) && sctx != s->session_ctx |
2d6f72aa | 979 | && s->hello_retry_request == SSL_HRR_NONE) { |
38b051a1 | 980 | ssl_tsan_counter(sctx, &sctx->stats.sess_accept); |
acce0557 | 981 | ssl_tsan_decr(s->session_ctx, &s->session_ctx->stats.sess_accept); |
3be08e30 BK |
982 | } |
983 | ||
a84e5c9a TS |
984 | /* |
985 | * If we're expecting to send a ticket, and tickets were previously enabled, | |
986 | * and now tickets are disabled, then turn off expected ticket. | |
987 | * Also, if this is not a resumption, create a new session ID | |
988 | */ | |
989 | if (ret == SSL_TLSEXT_ERR_OK && s->ext.ticket_expected | |
38b051a1 | 990 | && was_ticket && (SSL_get_options(ssl) & SSL_OP_NO_TICKET) != 0) { |
a84e5c9a TS |
991 | s->ext.ticket_expected = 0; |
992 | if (!s->hit) { | |
38b051a1 | 993 | SSL_SESSION* ss = SSL_get_session(ssl); |
a84e5c9a TS |
994 | |
995 | if (ss != NULL) { | |
996 | OPENSSL_free(ss->ext.tick); | |
997 | ss->ext.tick = NULL; | |
998 | ss->ext.ticklen = 0; | |
999 | ss->ext.tick_lifetime_hint = 0; | |
1000 | ss->ext.tick_age_add = 0; | |
a84e5c9a | 1001 | if (!ssl_generate_session_id(s, ss)) { |
c48ffbcc | 1002 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
f63a17d6 | 1003 | return 0; |
a84e5c9a TS |
1004 | } |
1005 | } else { | |
c48ffbcc | 1006 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
f63a17d6 | 1007 | return 0; |
a84e5c9a TS |
1008 | } |
1009 | } | |
1010 | } | |
1011 | ||
805a2e9e MC |
1012 | switch (ret) { |
1013 | case SSL_TLSEXT_ERR_ALERT_FATAL: | |
c48ffbcc | 1014 | SSLfatal(s, altmp, SSL_R_CALLBACK_FAILED); |
805a2e9e MC |
1015 | return 0; |
1016 | ||
1017 | case SSL_TLSEXT_ERR_ALERT_WARNING: | |
fb62e47c | 1018 | /* TLSv1.3 doesn't have warning alerts so we suppress this */ |
38b051a1 | 1019 | if (!SSL_CONNECTION_IS_TLS13(s)) |
fb62e47c | 1020 | ssl3_send_alert(s, SSL3_AL_WARNING, altmp); |
cd624ccd | 1021 | s->servername_done = 0; |
805a2e9e MC |
1022 | return 1; |
1023 | ||
1024 | case SSL_TLSEXT_ERR_NOACK: | |
1025 | s->servername_done = 0; | |
1026 | return 1; | |
1027 | ||
1028 | default: | |
1029 | return 1; | |
1030 | } | |
1031 | } | |
1032 | ||
38b051a1 TM |
1033 | static int final_ec_pt_formats(SSL_CONNECTION *s, unsigned int context, |
1034 | int sent) | |
332eb390 MC |
1035 | { |
1036 | unsigned long alg_k, alg_a; | |
1037 | ||
1038 | if (s->server) | |
1039 | return 1; | |
1040 | ||
555cbb32 TS |
1041 | alg_k = s->s3.tmp.new_cipher->algorithm_mkey; |
1042 | alg_a = s->s3.tmp.new_cipher->algorithm_auth; | |
332eb390 MC |
1043 | |
1044 | /* | |
1045 | * If we are client and using an elliptic curve cryptography cipher | |
1046 | * suite, then if server returns an EC point formats lists extension it | |
1047 | * must contain uncompressed. | |
1048 | */ | |
aff8c126 RS |
1049 | if (s->ext.ecpointformats != NULL |
1050 | && s->ext.ecpointformats_len > 0 | |
cd0fb43c MC |
1051 | && s->ext.peer_ecpointformats != NULL |
1052 | && s->ext.peer_ecpointformats_len > 0 | |
1266eefd | 1053 | && ((alg_k & SSL_kECDHE) || (alg_a & SSL_aECDSA))) { |
332eb390 MC |
1054 | /* we are using an ECC cipher */ |
1055 | size_t i; | |
cd0fb43c | 1056 | unsigned char *list = s->ext.peer_ecpointformats; |
1266eefd | 1057 | |
cd0fb43c | 1058 | for (i = 0; i < s->ext.peer_ecpointformats_len; i++) { |
1266eefd | 1059 | if (*list++ == TLSEXT_ECPOINTFORMAT_uncompressed) |
332eb390 | 1060 | break; |
332eb390 | 1061 | } |
cd0fb43c | 1062 | if (i == s->ext.peer_ecpointformats_len) { |
c48ffbcc | 1063 | SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, |
f63a17d6 | 1064 | SSL_R_TLS_INVALID_ECPOINTFORMAT_LIST); |
332eb390 MC |
1065 | return 0; |
1066 | } | |
1067 | } | |
1068 | ||
1069 | return 1; | |
1070 | } | |
332eb390 | 1071 | |
38b051a1 | 1072 | static int init_session_ticket(SSL_CONNECTION *s, unsigned int context) |
332eb390 MC |
1073 | { |
1074 | if (!s->server) | |
aff8c126 | 1075 | s->ext.ticket_expected = 0; |
332eb390 MC |
1076 | |
1077 | return 1; | |
1078 | } | |
1079 | ||
8f8c11d8 | 1080 | #ifndef OPENSSL_NO_OCSP |
38b051a1 | 1081 | static int init_status_request(SSL_CONNECTION *s, unsigned int context) |
805a2e9e | 1082 | { |
f63e4288 | 1083 | if (s->server) { |
aff8c126 | 1084 | s->ext.status_type = TLSEXT_STATUSTYPE_nothing; |
f63e4288 MC |
1085 | } else { |
1086 | /* | |
1087 | * Ensure we get sensible values passed to tlsext_status_cb in the event | |
1088 | * that we don't receive a status message | |
1089 | */ | |
8cbfcc70 RS |
1090 | OPENSSL_free(s->ext.ocsp.resp); |
1091 | s->ext.ocsp.resp = NULL; | |
1092 | s->ext.ocsp.resp_len = 0; | |
f63e4288 | 1093 | } |
332eb390 MC |
1094 | |
1095 | return 1; | |
1096 | } | |
8f8c11d8 | 1097 | #endif |
332eb390 | 1098 | |
805a2e9e | 1099 | #ifndef OPENSSL_NO_NEXTPROTONEG |
38b051a1 | 1100 | static int init_npn(SSL_CONNECTION *s, unsigned int context) |
805a2e9e | 1101 | { |
555cbb32 | 1102 | s->s3.npn_seen = 0; |
805a2e9e MC |
1103 | |
1104 | return 1; | |
1105 | } | |
1106 | #endif | |
1107 | ||
38b051a1 | 1108 | static int init_alpn(SSL_CONNECTION *s, unsigned int context) |
805a2e9e | 1109 | { |
555cbb32 TS |
1110 | OPENSSL_free(s->s3.alpn_selected); |
1111 | s->s3.alpn_selected = NULL; | |
1112 | s->s3.alpn_selected_len = 0; | |
805a2e9e | 1113 | if (s->server) { |
555cbb32 TS |
1114 | OPENSSL_free(s->s3.alpn_proposed); |
1115 | s->s3.alpn_proposed = NULL; | |
1116 | s->s3.alpn_proposed_len = 0; | |
805a2e9e | 1117 | } |
805a2e9e MC |
1118 | return 1; |
1119 | } | |
1120 | ||
38b051a1 | 1121 | static int final_alpn(SSL_CONNECTION *s, unsigned int context, int sent) |
630369d9 | 1122 | { |
4be3a7c7 MC |
1123 | if (!s->server && !sent && s->session->ext.alpn_selected != NULL) |
1124 | s->ext.early_data_ok = 0; | |
1125 | ||
38b051a1 | 1126 | if (!s->server || !SSL_CONNECTION_IS_TLS13(s)) |
630369d9 MC |
1127 | return 1; |
1128 | ||
1129 | /* | |
1130 | * Call alpn_select callback if needed. Has to be done after SNI and | |
1131 | * cipher negotiation (HTTP/2 restricts permitted ciphers). In TLSv1.3 | |
1132 | * we also have to do this before we decide whether to accept early_data. | |
1133 | * In TLSv1.3 we've already negotiated our cipher so we do this call now. | |
1134 | * For < TLSv1.3 we defer it until after cipher negotiation. | |
56d36288 | 1135 | * |
f63a17d6 | 1136 | * On failure SSLfatal() already called. |
630369d9 | 1137 | */ |
f63a17d6 | 1138 | return tls_handle_alpn(s); |
630369d9 MC |
1139 | } |
1140 | ||
38b051a1 | 1141 | static int init_sig_algs(SSL_CONNECTION *s, unsigned int context) |
805a2e9e MC |
1142 | { |
1143 | /* Clear any signature algorithms extension received */ | |
555cbb32 TS |
1144 | OPENSSL_free(s->s3.tmp.peer_sigalgs); |
1145 | s->s3.tmp.peer_sigalgs = NULL; | |
02b1636f | 1146 | s->s3.tmp.peer_sigalgslen = 0; |
805a2e9e MC |
1147 | |
1148 | return 1; | |
1149 | } | |
1150 | ||
38b051a1 TM |
1151 | static int init_sig_algs_cert(SSL_CONNECTION *s, |
1152 | ossl_unused unsigned int context) | |
c589c34e BK |
1153 | { |
1154 | /* Clear any signature algorithms extension received */ | |
555cbb32 TS |
1155 | OPENSSL_free(s->s3.tmp.peer_cert_sigalgs); |
1156 | s->s3.tmp.peer_cert_sigalgs = NULL; | |
39a14059 | 1157 | s->s3.tmp.peer_cert_sigalgslen = 0; |
c589c34e BK |
1158 | |
1159 | return 1; | |
1160 | } | |
1161 | ||
805a2e9e | 1162 | #ifndef OPENSSL_NO_SRP |
38b051a1 | 1163 | static int init_srp(SSL_CONNECTION *s, unsigned int context) |
805a2e9e MC |
1164 | { |
1165 | OPENSSL_free(s->srp_ctx.login); | |
1166 | s->srp_ctx.login = NULL; | |
1167 | ||
1168 | return 1; | |
1169 | } | |
1170 | #endif | |
1171 | ||
38b051a1 | 1172 | static int init_ec_point_formats(SSL_CONNECTION *s, unsigned int context) |
3f987381 DB |
1173 | { |
1174 | OPENSSL_free(s->ext.peer_ecpointformats); | |
1175 | s->ext.peer_ecpointformats = NULL; | |
1176 | s->ext.peer_ecpointformats_len = 0; | |
1177 | ||
1178 | return 1; | |
1179 | } | |
1180 | ||
38b051a1 | 1181 | static int init_etm(SSL_CONNECTION *s, unsigned int context) |
805a2e9e | 1182 | { |
28a31a0a | 1183 | s->ext.use_etm = 0; |
332eb390 MC |
1184 | |
1185 | return 1; | |
1186 | } | |
1187 | ||
38b051a1 | 1188 | static int init_ems(SSL_CONNECTION *s, unsigned int context) |
332eb390 | 1189 | { |
11d3235e TM |
1190 | if (s->s3.flags & TLS1_FLAGS_RECEIVED_EXTMS) { |
1191 | s->s3.flags &= ~TLS1_FLAGS_RECEIVED_EXTMS; | |
1192 | s->s3.flags |= TLS1_FLAGS_REQUIRED_EXTMS; | |
1193 | } | |
332eb390 MC |
1194 | |
1195 | return 1; | |
1196 | } | |
1197 | ||
38b051a1 | 1198 | static int final_ems(SSL_CONNECTION *s, unsigned int context, int sent) |
332eb390 | 1199 | { |
11d3235e TM |
1200 | /* |
1201 | * Check extended master secret extension is not dropped on | |
1202 | * renegotiation. | |
1203 | */ | |
1204 | if (!(s->s3.flags & TLS1_FLAGS_RECEIVED_EXTMS) | |
1205 | && (s->s3.flags & TLS1_FLAGS_REQUIRED_EXTMS)) { | |
c48ffbcc | 1206 | SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE, SSL_R_INCONSISTENT_EXTMS); |
11d3235e TM |
1207 | return 0; |
1208 | } | |
332eb390 MC |
1209 | if (!s->server && s->hit) { |
1210 | /* | |
1211 | * Check extended master secret extension is consistent with | |
1212 | * original session. | |
1213 | */ | |
555cbb32 | 1214 | if (!(s->s3.flags & TLS1_FLAGS_RECEIVED_EXTMS) != |
332eb390 | 1215 | !(s->session->flags & SSL_SESS_FLAG_EXTMS)) { |
c48ffbcc | 1216 | SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE, SSL_R_INCONSISTENT_EXTMS); |
332eb390 MC |
1217 | return 0; |
1218 | } | |
1219 | } | |
805a2e9e MC |
1220 | |
1221 | return 1; | |
1222 | } | |
1223 | ||
38b051a1 | 1224 | static int init_certificate_authorities(SSL_CONNECTION *s, unsigned int context) |
45615c5f | 1225 | { |
555cbb32 TS |
1226 | sk_X509_NAME_pop_free(s->s3.tmp.peer_ca_names, X509_NAME_free); |
1227 | s->s3.tmp.peer_ca_names = NULL; | |
45615c5f DSH |
1228 | return 1; |
1229 | } | |
1230 | ||
38b051a1 TM |
1231 | static EXT_RETURN tls_construct_certificate_authorities(SSL_CONNECTION *s, |
1232 | WPACKET *pkt, | |
b186a592 MC |
1233 | unsigned int context, |
1234 | X509 *x, | |
f63a17d6 | 1235 | size_t chainidx) |
45615c5f | 1236 | { |
98732979 | 1237 | const STACK_OF(X509_NAME) *ca_sk = get_ca_names(s); |
45615c5f DSH |
1238 | |
1239 | if (ca_sk == NULL || sk_X509_NAME_num(ca_sk) == 0) | |
b186a592 | 1240 | return EXT_RETURN_NOT_SENT; |
45615c5f DSH |
1241 | |
1242 | if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_certificate_authorities) | |
f63a17d6 | 1243 | || !WPACKET_start_sub_packet_u16(pkt)) { |
c48ffbcc | 1244 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
b186a592 | 1245 | return EXT_RETURN_FAIL; |
45615c5f DSH |
1246 | } |
1247 | ||
98732979 | 1248 | if (!construct_ca_names(s, ca_sk, pkt)) { |
f63a17d6 MC |
1249 | /* SSLfatal() already called */ |
1250 | return EXT_RETURN_FAIL; | |
1251 | } | |
1252 | ||
1253 | if (!WPACKET_close(pkt)) { | |
c48ffbcc | 1254 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
f63a17d6 MC |
1255 | return EXT_RETURN_FAIL; |
1256 | } | |
1257 | ||
b186a592 | 1258 | return EXT_RETURN_SENT; |
45615c5f DSH |
1259 | } |
1260 | ||
38b051a1 | 1261 | static int tls_parse_certificate_authorities(SSL_CONNECTION *s, PACKET *pkt, |
45615c5f | 1262 | unsigned int context, X509 *x, |
f63a17d6 | 1263 | size_t chainidx) |
45615c5f | 1264 | { |
f63a17d6 | 1265 | if (!parse_ca_names(s, pkt)) |
45615c5f DSH |
1266 | return 0; |
1267 | if (PACKET_remaining(pkt) != 0) { | |
c48ffbcc | 1268 | SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_R_BAD_EXTENSION); |
45615c5f DSH |
1269 | return 0; |
1270 | } | |
1271 | return 1; | |
1272 | } | |
1273 | ||
805a2e9e | 1274 | #ifndef OPENSSL_NO_SRTP |
38b051a1 | 1275 | static int init_srtp(SSL_CONNECTION *s, unsigned int context) |
805a2e9e MC |
1276 | { |
1277 | if (s->server) | |
1278 | s->srtp_profile = NULL; | |
1279 | ||
1280 | return 1; | |
1281 | } | |
1282 | #endif | |
04904312 | 1283 | |
38b051a1 | 1284 | static int final_sig_algs(SSL_CONNECTION *s, unsigned int context, int sent) |
04904312 | 1285 | { |
38b051a1 | 1286 | if (!sent && SSL_CONNECTION_IS_TLS13(s) && !s->hit) { |
c48ffbcc | 1287 | SSLfatal(s, TLS13_AD_MISSING_EXTENSION, |
f63a17d6 | 1288 | SSL_R_MISSING_SIGALGS_EXTENSION); |
04904312 MC |
1289 | return 0; |
1290 | } | |
1291 | ||
1292 | return 1; | |
1293 | } | |
b2f7e8c0 | 1294 | |
38b051a1 | 1295 | static int final_key_share(SSL_CONNECTION *s, unsigned int context, int sent) |
f4bbb37c | 1296 | { |
65dc5c3c | 1297 | #if !defined(OPENSSL_NO_TLS1_3) |
38b051a1 | 1298 | if (!SSL_CONNECTION_IS_TLS13(s)) |
f4bbb37c MC |
1299 | return 1; |
1300 | ||
07d447a6 MC |
1301 | /* Nothing to do for key_share in an HRR */ |
1302 | if ((context & SSL_EXT_TLS1_3_HELLO_RETRY_REQUEST) != 0) | |
1303 | return 1; | |
1304 | ||
f4bbb37c MC |
1305 | /* |
1306 | * If | |
aff9929b MC |
1307 | * we are a client |
1308 | * AND | |
f4bbb37c MC |
1309 | * we have no key_share |
1310 | * AND | |
1311 | * (we are not resuming | |
1312 | * OR the kex_mode doesn't allow non key_share resumes) | |
1313 | * THEN | |
aff9929b | 1314 | * fail; |
f4bbb37c | 1315 | */ |
aff9929b MC |
1316 | if (!s->server |
1317 | && !sent | |
f4bbb37c MC |
1318 | && (!s->hit |
1319 | || (s->ext.psk_kex_mode & TLSEXT_KEX_MODE_FLAG_KE) == 0)) { | |
7d061fce | 1320 | /* Nothing left we can do - just fail */ |
c48ffbcc | 1321 | SSLfatal(s, SSL_AD_MISSING_EXTENSION, SSL_R_NO_SUITABLE_KEY_SHARE); |
f4bbb37c MC |
1322 | return 0; |
1323 | } | |
aff9929b | 1324 | /* |
c36001c3 | 1325 | * IF |
aff9929b | 1326 | * we are a server |
aff9929b | 1327 | * THEN |
c36001c3 MC |
1328 | * IF |
1329 | * we have a suitable key_share | |
aff9929b | 1330 | * THEN |
c36001c3 MC |
1331 | * IF |
1332 | * we are stateless AND we have no cookie | |
1333 | * THEN | |
1334 | * send a HelloRetryRequest | |
1335 | * ELSE | |
1336 | * IF | |
1337 | * we didn't already send a HelloRetryRequest | |
1338 | * AND | |
1339 | * the client sent a key_share extension | |
1340 | * AND | |
1341 | * (we are not resuming | |
1342 | * OR the kex_mode allows key_share resumes) | |
1343 | * AND | |
1344 | * a shared group exists | |
1345 | * THEN | |
1346 | * send a HelloRetryRequest | |
1347 | * ELSE IF | |
1348 | * we are not resuming | |
1349 | * OR | |
1350 | * the kex_mode doesn't allow non key_share resumes | |
1351 | * THEN | |
1352 | * fail | |
1353 | * ELSE IF | |
1354 | * we are stateless AND we have no cookie | |
1355 | * THEN | |
1356 | * send a HelloRetryRequest | |
aff9929b | 1357 | */ |
c36001c3 | 1358 | if (s->server) { |
555cbb32 | 1359 | if (s->s3.peer_tmp != NULL) { |
c36001c3 | 1360 | /* We have a suitable key_share */ |
555cbb32 | 1361 | if ((s->s3.flags & TLS1_FLAGS_STATELESS) != 0 |
c36001c3 MC |
1362 | && !s->ext.cookieok) { |
1363 | if (!ossl_assert(s->hello_retry_request == SSL_HRR_NONE)) { | |
1364 | /* | |
1365 | * If we are stateless then we wouldn't know about any | |
1366 | * previously sent HRR - so how can this be anything other | |
1367 | * than 0? | |
1368 | */ | |
c48ffbcc | 1369 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
c36001c3 MC |
1370 | return 0; |
1371 | } | |
1372 | s->hello_retry_request = SSL_HRR_PENDING; | |
1373 | return 1; | |
1374 | } | |
1375 | } else { | |
1376 | /* No suitable key_share */ | |
1377 | if (s->hello_retry_request == SSL_HRR_NONE && sent | |
1378 | && (!s->hit | |
1379 | || (s->ext.psk_kex_mode & TLSEXT_KEX_MODE_FLAG_KE_DHE) | |
1380 | != 0)) { | |
1381 | const uint16_t *pgroups, *clntgroups; | |
1382 | size_t num_groups, clnt_num_groups, i; | |
1383 | unsigned int group_id = 0; | |
1384 | ||
1385 | /* Check if a shared group exists */ | |
1386 | ||
1387 | /* Get the clients list of supported groups. */ | |
1388 | tls1_get_peer_groups(s, &clntgroups, &clnt_num_groups); | |
1389 | tls1_get_supported_groups(s, &pgroups, &num_groups); | |
1390 | ||
1391 | /* | |
1392 | * Find the first group we allow that is also in client's list | |
1393 | */ | |
1394 | for (i = 0; i < num_groups; i++) { | |
1395 | group_id = pgroups[i]; | |
1396 | ||
1397 | if (check_in_list(s, group_id, clntgroups, clnt_num_groups, | |
0a10825a | 1398 | 2)) |
c36001c3 MC |
1399 | break; |
1400 | } | |
1401 | ||
1402 | if (i < num_groups) { | |
1403 | /* A shared group exists so send a HelloRetryRequest */ | |
555cbb32 | 1404 | s->s3.group_id = group_id; |
c36001c3 MC |
1405 | s->hello_retry_request = SSL_HRR_PENDING; |
1406 | return 1; | |
1407 | } | |
1408 | } | |
1409 | if (!s->hit | |
1410 | || (s->ext.psk_kex_mode & TLSEXT_KEX_MODE_FLAG_KE) == 0) { | |
1411 | /* Nothing left we can do - just fail */ | |
1412 | SSLfatal(s, sent ? SSL_AD_HANDSHAKE_FAILURE | |
1413 | : SSL_AD_MISSING_EXTENSION, | |
c48ffbcc | 1414 | SSL_R_NO_SUITABLE_KEY_SHARE); |
c36001c3 | 1415 | return 0; |
aff9929b MC |
1416 | } |
1417 | ||
555cbb32 | 1418 | if ((s->s3.flags & TLS1_FLAGS_STATELESS) != 0 |
c36001c3 MC |
1419 | && !s->ext.cookieok) { |
1420 | if (!ossl_assert(s->hello_retry_request == SSL_HRR_NONE)) { | |
1421 | /* | |
1422 | * If we are stateless then we wouldn't know about any | |
1423 | * previously sent HRR - so how can this be anything other | |
1424 | * than 0? | |
1425 | */ | |
c48ffbcc | 1426 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
c36001c3 MC |
1427 | return 0; |
1428 | } | |
fc7129dc | 1429 | s->hello_retry_request = SSL_HRR_PENDING; |
aff9929b MC |
1430 | return 1; |
1431 | } | |
1432 | } | |
c36001c3 MC |
1433 | |
1434 | /* | |
1435 | * We have a key_share so don't send any more HelloRetryRequest | |
1436 | * messages | |
1437 | */ | |
1438 | if (s->hello_retry_request == SSL_HRR_PENDING) | |
1439 | s->hello_retry_request = SSL_HRR_COMPLETE; | |
1440 | } else { | |
1441 | /* | |
1442 | * For a client side resumption with no key_share we need to generate | |
1443 | * the handshake secret (otherwise this is done during key_share | |
1444 | * processing). | |
1445 | */ | |
1446 | if (!sent && !tls13_generate_handshake_secret(s, NULL, 0)) { | |
c48ffbcc | 1447 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
aff9929b MC |
1448 | return 0; |
1449 | } | |
1450 | } | |
65dc5c3c | 1451 | #endif /* !defined(OPENSSL_NO_TLS1_3) */ |
f4bbb37c MC |
1452 | return 1; |
1453 | } | |
1454 | ||
38b051a1 | 1455 | static int init_psk_kex_modes(SSL_CONNECTION *s, unsigned int context) |
b2f7e8c0 MC |
1456 | { |
1457 | s->ext.psk_kex_mode = TLSEXT_KEX_MODE_FLAG_NONE; | |
b2f7e8c0 MC |
1458 | return 1; |
1459 | } | |
1053a6e2 | 1460 | |
38b051a1 TM |
1461 | int tls_psk_do_binder(SSL_CONNECTION *s, const EVP_MD *md, |
1462 | const unsigned char *msgstart, | |
1053a6e2 | 1463 | size_t binderoffset, const unsigned char *binderin, |
3a7c56b2 MC |
1464 | unsigned char *binderout, SSL_SESSION *sess, int sign, |
1465 | int external) | |
1053a6e2 MC |
1466 | { |
1467 | EVP_PKEY *mackey = NULL; | |
1468 | EVP_MD_CTX *mctx = NULL; | |
1469 | unsigned char hash[EVP_MAX_MD_SIZE], binderkey[EVP_MAX_MD_SIZE]; | |
1470 | unsigned char finishedkey[EVP_MAX_MD_SIZE], tmpbinder[EVP_MAX_MD_SIZE]; | |
4ff1a526 | 1471 | unsigned char *early_secret; |
48102247 | 1472 | #ifdef CHARSET_EBCDIC |
6ed12cec | 1473 | static const unsigned char resumption_label[] = { 0x72, 0x65, 0x73, 0x20, 0x62, 0x69, 0x6E, 0x64, 0x65, 0x72, 0x00 }; |
48102247 | 1474 | static const unsigned char external_label[] = { 0x65, 0x78, 0x74, 0x20, 0x62, 0x69, 0x6E, 0x64, 0x65, 0x72, 0x00 }; |
1475 | #else | |
4ff1a526 MC |
1476 | static const unsigned char resumption_label[] = "res binder"; |
1477 | static const unsigned char external_label[] = "ext binder"; | |
48102247 | 1478 | #endif |
4ff1a526 MC |
1479 | const unsigned char *label; |
1480 | size_t bindersize, labelsize, hashsize; | |
ed576acd | 1481 | int hashsizei = EVP_MD_get_size(md); |
1053a6e2 | 1482 | int ret = -1; |
add8d0e9 | 1483 | int usepskfored = 0; |
38b051a1 | 1484 | SSL_CTX *sctx = SSL_CONNECTION_GET_CTX(s); |
add8d0e9 | 1485 | |
bceae201 MC |
1486 | /* Ensure cast to size_t is safe */ |
1487 | if (!ossl_assert(hashsizei >= 0)) { | |
c48ffbcc | 1488 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
bceae201 MC |
1489 | goto err; |
1490 | } | |
1491 | hashsize = (size_t)hashsizei; | |
1492 | ||
add8d0e9 MC |
1493 | if (external |
1494 | && s->early_data_state == SSL_EARLY_DATA_CONNECTING | |
1495 | && s->session->ext.max_early_data == 0 | |
1496 | && sess->ext.max_early_data > 0) | |
1497 | usepskfored = 1; | |
1053a6e2 | 1498 | |
3a7c56b2 MC |
1499 | if (external) { |
1500 | label = external_label; | |
1501 | labelsize = sizeof(external_label) - 1; | |
1502 | } else { | |
1503 | label = resumption_label; | |
1504 | labelsize = sizeof(resumption_label) - 1; | |
1505 | } | |
1506 | ||
9368f865 MC |
1507 | /* |
1508 | * Generate the early_secret. On the server side we've selected a PSK to | |
1509 | * resume with (internal or external) so we always do this. On the client | |
add8d0e9 MC |
1510 | * side we do this for a non-external (i.e. resumption) PSK or external PSK |
1511 | * that will be used for early_data so that it is in place for sending early | |
1512 | * data. For client side external PSK not being used for early_data we | |
9368f865 MC |
1513 | * generate it but store it away for later use. |
1514 | */ | |
add8d0e9 | 1515 | if (s->server || !external || usepskfored) |
9368f865 MC |
1516 | early_secret = (unsigned char *)s->early_secret; |
1517 | else | |
1518 | early_secret = (unsigned char *)sess->early_secret; | |
4ff1a526 MC |
1519 | |
1520 | if (!tls13_generate_secret(s, md, NULL, sess->master_key, | |
1521 | sess->master_key_length, early_secret)) { | |
635c8f77 | 1522 | /* SSLfatal() already called */ |
1053a6e2 MC |
1523 | goto err; |
1524 | } | |
1525 | ||
1526 | /* | |
1527 | * Create the handshake hash for the binder key...the messages so far are | |
1528 | * empty! | |
1529 | */ | |
1530 | mctx = EVP_MD_CTX_new(); | |
1531 | if (mctx == NULL | |
1532 | || EVP_DigestInit_ex(mctx, md, NULL) <= 0 | |
1533 | || EVP_DigestFinal_ex(mctx, hash, NULL) <= 0) { | |
c48ffbcc | 1534 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
1053a6e2 MC |
1535 | goto err; |
1536 | } | |
1537 | ||
1538 | /* Generate the binder key */ | |
4ff1a526 | 1539 | if (!tls13_hkdf_expand(s, md, early_secret, label, labelsize, hash, |
0fb2815b | 1540 | hashsize, binderkey, hashsize, 1)) { |
635c8f77 | 1541 | /* SSLfatal() already called */ |
1053a6e2 MC |
1542 | goto err; |
1543 | } | |
1544 | ||
1545 | /* Generate the finished key */ | |
1546 | if (!tls13_derive_finishedkey(s, md, binderkey, finishedkey, hashsize)) { | |
635c8f77 | 1547 | /* SSLfatal() already called */ |
1053a6e2 MC |
1548 | goto err; |
1549 | } | |
1550 | ||
aff9929b | 1551 | if (EVP_DigestInit_ex(mctx, md, NULL) <= 0) { |
c48ffbcc | 1552 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
aff9929b MC |
1553 | goto err; |
1554 | } | |
1555 | ||
1053a6e2 | 1556 | /* |
aff9929b MC |
1557 | * Get a hash of the ClientHello up to the start of the binders. If we are |
1558 | * following a HelloRetryRequest then this includes the hash of the first | |
1559 | * ClientHello and the HelloRetryRequest itself. | |
1053a6e2 | 1560 | */ |
fc7129dc | 1561 | if (s->hello_retry_request == SSL_HRR_PENDING) { |
aff9929b | 1562 | size_t hdatalen; |
60690b5b | 1563 | long hdatalen_l; |
aff9929b MC |
1564 | void *hdata; |
1565 | ||
60690b5b | 1566 | hdatalen = hdatalen_l = |
555cbb32 | 1567 | BIO_get_mem_data(s->s3.handshake_buffer, &hdata); |
60690b5b | 1568 | if (hdatalen_l <= 0) { |
c48ffbcc | 1569 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_R_BAD_HANDSHAKE_LENGTH); |
aff9929b MC |
1570 | goto err; |
1571 | } | |
1572 | ||
1573 | /* | |
1574 | * For servers the handshake buffer data will include the second | |
1575 | * ClientHello - which we don't want - so we need to take that bit off. | |
1576 | */ | |
1577 | if (s->server) { | |
77815a02 MC |
1578 | PACKET hashprefix, msg; |
1579 | ||
1580 | /* Find how many bytes are left after the first two messages */ | |
1581 | if (!PACKET_buf_init(&hashprefix, hdata, hdatalen) | |
1582 | || !PACKET_forward(&hashprefix, 1) | |
1583 | || !PACKET_get_length_prefixed_3(&hashprefix, &msg) | |
1584 | || !PACKET_forward(&hashprefix, 1) | |
1585 | || !PACKET_get_length_prefixed_3(&hashprefix, &msg)) { | |
c48ffbcc | 1586 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
aff9929b MC |
1587 | goto err; |
1588 | } | |
77815a02 | 1589 | hdatalen -= PACKET_remaining(&hashprefix); |
aff9929b MC |
1590 | } |
1591 | ||
1592 | if (EVP_DigestUpdate(mctx, hdata, hdatalen) <= 0) { | |
c48ffbcc | 1593 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
aff9929b MC |
1594 | goto err; |
1595 | } | |
1596 | } | |
1597 | ||
1598 | if (EVP_DigestUpdate(mctx, msgstart, binderoffset) <= 0 | |
1053a6e2 | 1599 | || EVP_DigestFinal_ex(mctx, hash, NULL) <= 0) { |
c48ffbcc | 1600 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
1053a6e2 MC |
1601 | goto err; |
1602 | } | |
1603 | ||
38b051a1 TM |
1604 | mackey = EVP_PKEY_new_raw_private_key_ex(sctx->libctx, "HMAC", |
1605 | sctx->propq, finishedkey, | |
d8652be0 | 1606 | hashsize); |
1053a6e2 | 1607 | if (mackey == NULL) { |
c48ffbcc | 1608 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
1053a6e2 MC |
1609 | goto err; |
1610 | } | |
1611 | ||
1612 | if (!sign) | |
1613 | binderout = tmpbinder; | |
1614 | ||
1615 | bindersize = hashsize; | |
38b051a1 TM |
1616 | if (EVP_DigestSignInit_ex(mctx, NULL, EVP_MD_get0_name(md), sctx->libctx, |
1617 | sctx->propq, mackey, NULL) <= 0 | |
1053a6e2 MC |
1618 | || EVP_DigestSignUpdate(mctx, hash, hashsize) <= 0 |
1619 | || EVP_DigestSignFinal(mctx, binderout, &bindersize) <= 0 | |
1620 | || bindersize != hashsize) { | |
c48ffbcc | 1621 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
1053a6e2 MC |
1622 | goto err; |
1623 | } | |
1624 | ||
1625 | if (sign) { | |
1626 | ret = 1; | |
1627 | } else { | |
1628 | /* HMAC keys can't do EVP_DigestVerify* - use CRYPTO_memcmp instead */ | |
1629 | ret = (CRYPTO_memcmp(binderin, binderout, hashsize) == 0); | |
635c8f77 | 1630 | if (!ret) |
c48ffbcc | 1631 | SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_R_BINDER_DOES_NOT_VERIFY); |
1053a6e2 MC |
1632 | } |
1633 | ||
1634 | err: | |
1635 | OPENSSL_cleanse(binderkey, sizeof(binderkey)); | |
1636 | OPENSSL_cleanse(finishedkey, sizeof(finishedkey)); | |
1637 | EVP_PKEY_free(mackey); | |
1638 | EVP_MD_CTX_free(mctx); | |
1639 | ||
1640 | return ret; | |
1641 | } | |
38df5a45 | 1642 | |
38b051a1 | 1643 | static int final_early_data(SSL_CONNECTION *s, unsigned int context, int sent) |
38df5a45 | 1644 | { |
4be3a7c7 MC |
1645 | if (!sent) |
1646 | return 1; | |
1647 | ||
1648 | if (!s->server) { | |
1649 | if (context == SSL_EXT_TLS1_3_ENCRYPTED_EXTENSIONS | |
1650 | && sent | |
1651 | && !s->ext.early_data_ok) { | |
1652 | /* | |
1653 | * If we get here then the server accepted our early_data but we | |
1654 | * later realised that it shouldn't have done (e.g. inconsistent | |
1655 | * ALPN) | |
1656 | */ | |
c48ffbcc | 1657 | SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_R_BAD_EARLY_DATA); |
4be3a7c7 MC |
1658 | return 0; |
1659 | } | |
1660 | ||
38df5a45 | 1661 | return 1; |
4be3a7c7 | 1662 | } |
38df5a45 MC |
1663 | |
1664 | if (s->max_early_data == 0 | |
1665 | || !s->hit | |
38df5a45 MC |
1666 | || s->early_data_state != SSL_EARLY_DATA_ACCEPTING |
1667 | || !s->ext.early_data_ok | |
c9598459 | 1668 | || s->hello_retry_request != SSL_HRR_NONE |
59b2cb26 | 1669 | || (s->allow_early_data_cb != NULL |
38b051a1 | 1670 | && !s->allow_early_data_cb(SSL_CONNECTION_GET_SSL(s), |
59b2cb26 | 1671 | s->allow_early_data_cb_data))) { |
38df5a45 MC |
1672 | s->ext.early_data = SSL_EARLY_DATA_REJECTED; |
1673 | } else { | |
1674 | s->ext.early_data = SSL_EARLY_DATA_ACCEPTED; | |
1675 | ||
1676 | if (!tls13_change_cipher_state(s, | |
1677 | SSL3_CC_EARLY | SSL3_CHANGE_CIPHER_SERVER_READ)) { | |
f63a17d6 | 1678 | /* SSLfatal() already called */ |
38df5a45 MC |
1679 | return 0; |
1680 | } | |
1681 | } | |
1682 | ||
1683 | return 1; | |
1684 | } | |
cf72c757 | 1685 | |
38b051a1 TM |
1686 | static int final_maxfragmentlen(SSL_CONNECTION *s, unsigned int context, |
1687 | int sent) | |
cf72c757 F |
1688 | { |
1689 | /* | |
1690 | * Session resumption on server-side with MFL extension active | |
1691 | * BUT MFL extension packet was not resent (i.e. sent == 0) | |
1692 | */ | |
f63a17d6 | 1693 | if (s->server && s->hit && USE_MAX_FRAGMENT_LENGTH_EXT(s->session) |
cf72c757 | 1694 | && !sent ) { |
c48ffbcc | 1695 | SSLfatal(s, SSL_AD_MISSING_EXTENSION, SSL_R_BAD_EXTENSION); |
cf72c757 F |
1696 | return 0; |
1697 | } | |
1698 | ||
1699 | /* Current SSL buffer is lower than requested MFL */ | |
f63a17d6 MC |
1700 | if (s->session && USE_MAX_FRAGMENT_LENGTH_EXT(s->session) |
1701 | && s->max_send_fragment < GET_MAX_FRAGMENT_LENGTH(s->session)) | |
cf72c757 | 1702 | /* trigger a larger buffer reallocation */ |
f63a17d6 MC |
1703 | if (!ssl3_setup_buffers(s)) { |
1704 | /* SSLfatal() already called */ | |
cf72c757 | 1705 | return 0; |
f63a17d6 | 1706 | } |
cf72c757 F |
1707 | |
1708 | return 1; | |
1709 | } | |
9d75dce3 | 1710 | |
38b051a1 TM |
1711 | static int init_post_handshake_auth(SSL_CONNECTION *s, |
1712 | ossl_unused unsigned int context) | |
9d75dce3 TS |
1713 | { |
1714 | s->post_handshake_auth = SSL_PHA_NONE; | |
1715 | ||
1716 | return 1; | |
1717 | } | |
efe0f315 BK |
1718 | |
1719 | /* | |
1720 | * If clients offer "pre_shared_key" without a "psk_key_exchange_modes" | |
1721 | * extension, servers MUST abort the handshake. | |
1722 | */ | |
38b051a1 | 1723 | static int final_psk(SSL_CONNECTION *s, unsigned int context, int sent) |
efe0f315 BK |
1724 | { |
1725 | if (s->server && sent && s->clienthello != NULL | |
1726 | && !s->clienthello->pre_proc_exts[TLSEXT_IDX_psk_kex_modes].present) { | |
1727 | SSLfatal(s, TLS13_AD_MISSING_EXTENSION, | |
1728 | SSL_R_MISSING_PSK_KEX_MODES_EXTENSION); | |
1729 | return 0; | |
1730 | } | |
1731 | ||
1732 | return 1; | |
1733 | } |