2 * Copyright 2015-2016 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the OpenSSL license (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
10 /*****************************************************************************
12 * The following definitions are PRIVATE to the state machine. They should *
13 * NOT be used outside of the state machine. *
15 *****************************************************************************/
17 /* Max message length definitions */
19 /* The spec allows for a longer length than this, but we limit it */
20 #define HELLO_VERIFY_REQUEST_MAX_LENGTH 258
21 #define END_OF_EARLY_DATA_MAX_LENGTH 0
22 #define SERVER_HELLO_MAX_LENGTH 20000
23 #define HELLO_RETRY_REQUEST_MAX_LENGTH 20000
24 #define ENCRYPTED_EXTENSIONS_MAX_LENGTH 20000
25 #define SERVER_KEY_EXCH_MAX_LENGTH 102400
26 #define SERVER_HELLO_DONE_MAX_LENGTH 0
27 #define KEY_UPDATE_MAX_LENGTH 1
28 #define CCS_MAX_LENGTH 1
29 /* Max should actually be 36 but we are generous */
30 #define FINISHED_MAX_LENGTH 64
32 /* The maximum number of incoming KeyUpdate messages we will accept */
33 #define MAX_KEY_UPDATE_MESSAGES 32
35 /* Extension context codes */
36 /* This extension is only allowed in TLS */
37 #define EXT_TLS_ONLY 0x0001
38 /* This extension is only allowed in DTLS */
39 #define EXT_DTLS_ONLY 0x0002
40 /* Some extensions may be allowed in DTLS but we don't implement them for it */
41 #define EXT_TLS_IMPLEMENTATION_ONLY 0x0004
42 /* Most extensions are not defined for SSLv3 but EXT_TYPE_renegotiate is */
43 #define EXT_SSL3_ALLOWED 0x0008
44 /* Extension is only defined for TLS1.2 and above */
45 #define EXT_TLS1_2_AND_BELOW_ONLY 0x0010
46 /* Extension is only defined for TLS1.3 and above */
47 #define EXT_TLS1_3_ONLY 0x0020
48 #define EXT_CLIENT_HELLO 0x0040
49 /* Really means TLS1.2 or below */
50 #define EXT_TLS1_2_SERVER_HELLO 0x0080
51 #define EXT_TLS1_3_SERVER_HELLO 0x0100
52 #define EXT_TLS1_3_ENCRYPTED_EXTENSIONS 0x0200
53 #define EXT_TLS1_3_HELLO_RETRY_REQUEST 0x0400
54 #define EXT_TLS1_3_CERTIFICATE 0x0800
55 #define EXT_TLS1_3_NEW_SESSION_TICKET 0x1000
57 /* Dummy message type */
58 #define SSL3_MT_DUMMY -1
60 /* Message processing return codes */
62 /* Something bad happened */
64 /* We've finished reading - swap to writing */
65 MSG_PROCESS_FINISHED_READING,
67 * We've completed the main processing of this message but there is some
68 * post processing to be done.
70 MSG_PROCESS_CONTINUE_PROCESSING,
71 /* We've finished this message - read the next message */
72 MSG_PROCESS_CONTINUE_READING
75 /* Flush the write BIO */
76 int statem_flush(SSL *s);
78 typedef int (*confunc_f) (SSL *s, WPACKET *pkt);
80 int check_in_list(SSL *s, unsigned int group_id, const unsigned char *groups,
81 size_t num_groups, int checkallow);
82 int create_synthetic_message_hash(SSL *s);
84 * TLS/DTLS client state machine functions
86 int ossl_statem_client_read_transition(SSL *s, int mt);
87 WRITE_TRAN ossl_statem_client_write_transition(SSL *s);
88 WORK_STATE ossl_statem_client_pre_work(SSL *s, WORK_STATE wst);
89 WORK_STATE ossl_statem_client_post_work(SSL *s, WORK_STATE wst);
90 int ossl_statem_client_construct_message(SSL *s, WPACKET *pkt,
91 confunc_f *confunc, int *mt);
92 size_t ossl_statem_client_max_message_size(SSL *s);
93 MSG_PROCESS_RETURN ossl_statem_client_process_message(SSL *s, PACKET *pkt);
94 WORK_STATE ossl_statem_client_post_process_message(SSL *s, WORK_STATE wst);
97 * TLS/DTLS server state machine functions
99 int ossl_statem_server_read_transition(SSL *s, int mt);
100 WRITE_TRAN ossl_statem_server_write_transition(SSL *s);
101 WORK_STATE ossl_statem_server_pre_work(SSL *s, WORK_STATE wst);
102 WORK_STATE ossl_statem_server_post_work(SSL *s, WORK_STATE wst);
103 int ossl_statem_server_construct_message(SSL *s, WPACKET *pkt,
104 confunc_f *confunc,int *mt);
105 size_t ossl_statem_server_max_message_size(SSL *s);
106 MSG_PROCESS_RETURN ossl_statem_server_process_message(SSL *s, PACKET *pkt);
107 WORK_STATE ossl_statem_server_post_process_message(SSL *s, WORK_STATE wst);
109 /* Functions for getting new message data */
110 __owur int tls_get_message_header(SSL *s, int *mt);
111 __owur int tls_get_message_body(SSL *s, size_t *len);
112 __owur int dtls_get_message(SSL *s, int *mt, size_t *len);
114 /* Message construction and processing functions */
115 __owur int tls_process_initial_server_flight(SSL *s, int *al);
116 __owur MSG_PROCESS_RETURN tls_process_change_cipher_spec(SSL *s, PACKET *pkt);
117 __owur MSG_PROCESS_RETURN tls_process_finished(SSL *s, PACKET *pkt);
118 __owur int tls_construct_change_cipher_spec(SSL *s, WPACKET *pkt);
119 __owur int dtls_construct_change_cipher_spec(SSL *s, WPACKET *pkt);
121 __owur int tls_construct_finished(SSL *s, WPACKET *pkt);
122 __owur int tls_construct_key_update(SSL *s, WPACKET *pkt);
123 __owur MSG_PROCESS_RETURN tls_process_key_update(SSL *s, PACKET *pkt);
124 __owur WORK_STATE tls_finish_handshake(SSL *s, WORK_STATE wst, int clearbufs);
125 __owur WORK_STATE dtls_wait_for_dry(SSL *s);
127 /* some client-only functions */
128 __owur int tls_construct_client_hello(SSL *s, WPACKET *pkt);
129 __owur MSG_PROCESS_RETURN tls_process_server_hello(SSL *s, PACKET *pkt);
130 __owur MSG_PROCESS_RETURN tls_process_certificate_request(SSL *s, PACKET *pkt);
131 __owur MSG_PROCESS_RETURN tls_process_new_session_ticket(SSL *s, PACKET *pkt);
132 __owur int tls_process_cert_status_body(SSL *s, PACKET *pkt, int *al);
133 __owur MSG_PROCESS_RETURN tls_process_cert_status(SSL *s, PACKET *pkt);
134 __owur MSG_PROCESS_RETURN tls_process_server_done(SSL *s, PACKET *pkt);
135 __owur int tls_construct_cert_verify(SSL *s, WPACKET *pkt);
136 __owur WORK_STATE tls_prepare_client_certificate(SSL *s, WORK_STATE wst);
137 __owur int tls_construct_client_certificate(SSL *s, WPACKET *pkt);
138 __owur int ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey);
139 __owur int tls_construct_client_key_exchange(SSL *s, WPACKET *pkt);
140 __owur int tls_client_key_exchange_post_work(SSL *s);
141 __owur int tls_construct_cert_status_body(SSL *s, WPACKET *pkt);
142 __owur int tls_construct_cert_status(SSL *s, WPACKET *pkt);
143 __owur MSG_PROCESS_RETURN tls_process_key_exchange(SSL *s, PACKET *pkt);
144 __owur MSG_PROCESS_RETURN tls_process_server_certificate(SSL *s, PACKET *pkt);
145 __owur int ssl3_check_cert_and_algorithm(SSL *s);
146 #ifndef OPENSSL_NO_NEXTPROTONEG
147 __owur int tls_construct_next_proto(SSL *s, WPACKET *pkt);
149 __owur MSG_PROCESS_RETURN tls_process_hello_req(SSL *s, PACKET *pkt);
150 __owur MSG_PROCESS_RETURN dtls_process_hello_verify(SSL *s, PACKET *pkt);
151 __owur int tls_construct_end_of_early_data(SSL *s, WPACKET *pkt);
153 /* some server-only functions */
154 __owur MSG_PROCESS_RETURN tls_process_client_hello(SSL *s, PACKET *pkt);
155 __owur WORK_STATE tls_post_process_client_hello(SSL *s, WORK_STATE wst);
156 __owur int tls_construct_server_hello(SSL *s, WPACKET *pkt);
157 __owur int dtls_construct_hello_verify_request(SSL *s, WPACKET *pkt);
158 __owur int tls_construct_server_certificate(SSL *s, WPACKET *pkt);
159 __owur int tls_construct_server_key_exchange(SSL *s, WPACKET *pkt);
160 __owur int tls_construct_certificate_request(SSL *s, WPACKET *pkt);
161 __owur int tls_construct_server_done(SSL *s, WPACKET *pkt);
162 __owur MSG_PROCESS_RETURN tls_process_client_certificate(SSL *s, PACKET *pkt);
163 __owur MSG_PROCESS_RETURN tls_process_client_key_exchange(SSL *s, PACKET *pkt);
164 __owur WORK_STATE tls_post_process_client_key_exchange(SSL *s, WORK_STATE wst);
165 __owur MSG_PROCESS_RETURN tls_process_cert_verify(SSL *s, PACKET *pkt);
166 #ifndef OPENSSL_NO_NEXTPROTONEG
167 __owur MSG_PROCESS_RETURN tls_process_next_proto(SSL *s, PACKET *pkt);
169 __owur int tls_construct_new_session_ticket(SSL *s, WPACKET *pkt);
170 MSG_PROCESS_RETURN tls_process_end_of_early_data(SSL *s, PACKET *pkt);
173 /* Extension processing */
175 __owur int tls_collect_extensions(SSL *s, PACKET *packet, unsigned int context,
176 RAW_EXTENSION **res, int *al, size_t *len);
177 __owur int tls_parse_extension(SSL *s, TLSEXT_INDEX idx, int context,
178 RAW_EXTENSION *exts, X509 *x, size_t chainidx,
180 __owur int tls_parse_all_extensions(SSL *s, int context, RAW_EXTENSION *exts,
181 X509 *x, size_t chainidx, int *al);
182 __owur int tls_construct_extensions(SSL *s, WPACKET *pkt, unsigned int context,
183 X509 *x, size_t chainidx, int *al);
185 __owur int tls_psk_do_binder(SSL *s, const EVP_MD *md,
186 const unsigned char *msgstart,
187 size_t binderoffset, const unsigned char *binderin,
188 unsigned char *binderout,
189 SSL_SESSION *sess, int sign);
191 /* Server Extension processing */
192 int tls_parse_ctos_renegotiate(SSL *s, PACKET *pkt, unsigned int context,
193 X509 *x, size_t chainidx, int *al);
194 int tls_parse_ctos_server_name(SSL *s, PACKET *pkt, unsigned int context,
195 X509 *x, size_t chainidx, int *al);
196 #ifndef OPENSSL_NO_SRP
197 int tls_parse_ctos_srp(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
198 size_t chainidx, int *al);
200 int tls_parse_ctos_early_data(SSL *s, PACKET *pkt, unsigned int context,
201 X509 *x, size_t chainidx, int *al);
202 #ifndef OPENSSL_NO_EC
203 int tls_parse_ctos_ec_pt_formats(SSL *s, PACKET *pkt, unsigned int context,
204 X509 *x, size_t chainidx, int *al);
205 int tls_parse_ctos_supported_groups(SSL *s, PACKET *pkt, unsigned int context,
206 X509 *x, size_t chainidx, int *al);
208 int tls_parse_ctos_session_ticket(SSL *s, PACKET *pkt, unsigned int context,
209 X509 *x, size_t chainidx, int *al);
210 int tls_parse_ctos_sig_algs(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
211 size_t chainidx, int *al);
212 #ifndef OPENSSL_NO_OCSP
213 int tls_parse_ctos_status_request(SSL *s, PACKET *pkt, unsigned int context,
214 X509 *x, size_t chainidx, int *al);
216 #ifndef OPENSSL_NO_NEXTPROTONEG
217 int tls_parse_ctos_npn(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
218 size_t chainidx, int *al);
220 int tls_parse_ctos_alpn(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
221 size_t chainidx, int *al);
222 #ifndef OPENSSL_NO_SRTP
223 int tls_parse_ctos_use_srtp(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
224 size_t chainidx, int *al);
226 int tls_parse_ctos_etm(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
227 size_t chainidx, int *al);
228 int tls_parse_ctos_key_share(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
229 size_t chainidx, int *al);
230 int tls_parse_ctos_ems(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
231 size_t chainidx, int *al);
232 int tls_parse_ctos_psk_kex_modes(SSL *s, PACKET *pkt, unsigned int context,
233 X509 *x, size_t chainidx, int *al);
234 int tls_parse_ctos_psk(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
235 size_t chainidx, int *al);
237 int tls_construct_stoc_renegotiate(SSL *s, WPACKET *pkt, unsigned int context,
238 X509 *x, size_t chainidx, int *al);
239 int tls_construct_stoc_server_name(SSL *s, WPACKET *pkt, unsigned int context,
240 X509 *x, size_t chainidx, int *al);
241 int tls_construct_stoc_early_data(SSL *s, WPACKET *pkt, unsigned int context,
242 X509 *x, size_t chainidx, int *al);
243 #ifndef OPENSSL_NO_EC
244 int tls_construct_stoc_ec_pt_formats(SSL *s, WPACKET *pkt, unsigned int context,
245 X509 *x, size_t chainidx, int *al);
247 int tls_construct_stoc_session_ticket(SSL *s, WPACKET *pkt,
248 unsigned int context, X509 *x,
249 size_t chainidx, int *al);
250 #ifndef OPENSSL_NO_OCSP
251 int tls_construct_stoc_status_request(SSL *s, WPACKET *pkt,
252 unsigned int context, X509 *x,
253 size_t chainidx, int *al);
255 #ifndef OPENSSL_NO_NEXTPROTONEG
256 int tls_construct_stoc_next_proto_neg(SSL *s, WPACKET *pkt,
257 unsigned int context, X509 *x,
258 size_t chainidx, int *al);
260 int tls_construct_stoc_alpn(SSL *s, WPACKET *pkt, unsigned int context, X509 *x,
261 size_t chainidx, int *al);
262 #ifndef OPENSSL_NO_SRTP
263 int tls_construct_stoc_use_srtp(SSL *s, WPACKET *pkt, unsigned int context,
264 X509 *x, size_t chainidx, int *al);
266 int tls_construct_stoc_etm(SSL *s, WPACKET *pkt, unsigned int context, X509 *x,
267 size_t chainidx, int *al);
268 int tls_construct_stoc_ems(SSL *s, WPACKET *pkt, unsigned int context, X509 *x,
269 size_t chainidx, int *al);
270 int tls_construct_stoc_key_share(SSL *s, WPACKET *pkt, unsigned int context,
271 X509 *x, size_t chainidx, int *al);
273 * Not in public headers as this is not an official extension. Only used when
274 * SSL_OP_CRYPTOPRO_TLSEXT_BUG is set.
276 #define TLSEXT_TYPE_cryptopro_bug 0xfde8
277 int tls_construct_stoc_cryptopro_bug(SSL *s, WPACKET *pkt, unsigned int context,
278 X509 *x, size_t chainidx, int *al);
279 int tls_construct_stoc_psk(SSL *s, WPACKET *pkt, unsigned int context, X509 *x,
280 size_t chainidx, int *al);
282 /* Client Extension processing */
283 int tls_construct_ctos_renegotiate(SSL *s, WPACKET *pkt, unsigned int context,
284 X509 *x, size_t chainidx, int *al);
285 int tls_construct_ctos_server_name(SSL *s, WPACKET *pkt, unsigned int context,
286 X509 *x, size_t chainidx, int *al);
287 #ifndef OPENSSL_NO_SRP
288 int tls_construct_ctos_srp(SSL *s, WPACKET *pkt, unsigned int context, X509 *x,
289 size_t chainidx, int *al);
291 #ifndef OPENSSL_NO_EC
292 int tls_construct_ctos_ec_pt_formats(SSL *s, WPACKET *pkt, unsigned int context,
293 X509 *x, size_t chainidx, int *al);
294 int tls_construct_ctos_supported_groups(SSL *s, WPACKET *pkt,
295 unsigned int context, X509 *x,
296 size_t chainidx, int *al);
298 int tls_construct_ctos_early_data(SSL *s, WPACKET *pkt, unsigned int context,
299 X509 *x, size_t chainidx, int *al);
300 int tls_construct_ctos_session_ticket(SSL *s, WPACKET *pkt,
301 unsigned int context, X509 *x,
302 size_t chainidx, int *al);
303 int tls_construct_ctos_sig_algs(SSL *s, WPACKET *pkt, unsigned int context,
304 X509 *x, size_t chainidx, int *al);
305 #ifndef OPENSSL_NO_OCSP
306 int tls_construct_ctos_status_request(SSL *s, WPACKET *pkt,
307 unsigned int context, X509 *x,
308 size_t chainidx, int *al);
310 #ifndef OPENSSL_NO_NEXTPROTONEG
311 int tls_construct_ctos_npn(SSL *s, WPACKET *pkt, unsigned int context, X509 *x,
312 size_t chainidx, int *al);
314 int tls_construct_ctos_alpn(SSL *s, WPACKET *pkt, unsigned int context, X509 *x,
315 size_t chainidx, int *al);
316 #ifndef OPENSSL_NO_SRTP
317 int tls_construct_ctos_use_srtp(SSL *s, WPACKET *pkt, unsigned int context,
318 X509 *x, size_t chainidx, int *al);
320 int tls_construct_ctos_etm(SSL *s, WPACKET *pkt, unsigned int context, X509 *x,
321 size_t chainidx, int *al);
322 #ifndef OPENSSL_NO_CT
323 int tls_construct_ctos_sct(SSL *s, WPACKET *pkt, unsigned int context, X509 *x,
324 size_t chainidx, int *al);
326 int tls_construct_ctos_ems(SSL *s, WPACKET *pkt, unsigned int context, X509 *x,
327 size_t chainidx, int *al);
328 int tls_construct_ctos_supported_versions(SSL *s, WPACKET *pkt,
329 unsigned int context, X509 *x,
330 size_t chainidx, int *al);
331 int tls_construct_ctos_key_share(SSL *s, WPACKET *pkt, unsigned int context,
332 X509 *x, size_t chainidx, int *al);
333 int tls_construct_ctos_psk_kex_modes(SSL *s, WPACKET *pkt, unsigned int context,
334 X509 *x, size_t chainidx, int *al);
335 int tls_construct_ctos_cookie(SSL *s, WPACKET *pkt, unsigned int context,
336 X509 *x, size_t chainidx, int *al);
337 int tls_construct_ctos_padding(SSL *s, WPACKET *pkt, unsigned int context,
338 X509 *x, size_t chainidx, int *al);
339 int tls_construct_ctos_psk(SSL *s, WPACKET *pkt, unsigned int context, X509 *x,
340 size_t chainidx, int *al);
341 int tls_parse_stoc_renegotiate(SSL *s, PACKET *pkt, unsigned int context,
342 X509 *x, size_t chainidx, int *al);
343 int tls_parse_stoc_server_name(SSL *s, PACKET *pkt, unsigned int context,
344 X509 *x, size_t chainidx, int *al);
345 int tls_parse_stoc_early_data(SSL *s, PACKET *pkt, unsigned int context,
346 X509 *x, size_t chainidx, int *al);
347 #ifndef OPENSSL_NO_EC
348 int tls_parse_stoc_ec_pt_formats(SSL *s, PACKET *pkt, unsigned int context,
349 X509 *x, size_t chainidx, int *al);
351 int tls_parse_stoc_session_ticket(SSL *s, PACKET *pkt, unsigned int context,
352 X509 *x, size_t chainidx, int *al);
353 #ifndef OPENSSL_NO_OCSP
354 int tls_parse_stoc_status_request(SSL *s, PACKET *pkt, unsigned int context,
355 X509 *x, size_t chainidx, int *al);
357 #ifndef OPENSSL_NO_CT
358 int tls_parse_stoc_sct(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
359 size_t chainidx, int *al);
361 #ifndef OPENSSL_NO_NEXTPROTONEG
362 int tls_parse_stoc_npn(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
363 size_t chainidx, int *al);
365 int tls_parse_stoc_alpn(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
366 size_t chainidx, int *al);
367 #ifndef OPENSSL_NO_SRTP
368 int tls_parse_stoc_use_srtp(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
369 size_t chainidx, int *al);
371 int tls_parse_stoc_etm(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
372 size_t chainidx, int *al);
373 int tls_parse_stoc_ems(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
374 size_t chainidx, int *al);
375 int tls_parse_stoc_key_share(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
376 size_t chainidx, int *al);
377 int tls_parse_stoc_cookie(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
378 size_t chainidx, int *al);
379 int tls_parse_stoc_psk(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
380 size_t chainidx, int *al);