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 SERVER_HELLO_MAX_LENGTH 20000
22 #define HELLO_RETRY_REQUEST_MAX_LENGTH 20000
23 #define ENCRYPTED_EXTENSIONS_MAX_LENGTH 20000
24 #define SERVER_KEY_EXCH_MAX_LENGTH 102400
25 #define SERVER_HELLO_DONE_MAX_LENGTH 0
26 #define KEY_UPDATE_MAX_LENGTH 1
27 #define CCS_MAX_LENGTH 1
28 /* Max should actually be 36 but we are generous */
29 #define FINISHED_MAX_LENGTH 64
31 /* The maximum number of incoming KeyUpdate messages we will accept */
32 #define MAX_KEY_UPDATE_MESSAGES 32
34 /* Extension context codes */
35 /* This extension is only allowed in TLS */
36 #define EXT_TLS_ONLY 0x0001
37 /* This extension is only allowed in DTLS */
38 #define EXT_DTLS_ONLY 0x0002
39 /* Some extensions may be allowed in DTLS but we don't implement them for it */
40 #define EXT_TLS_IMPLEMENTATION_ONLY 0x0004
41 /* Most extensions are not defined for SSLv3 but EXT_TYPE_renegotiate is */
42 #define EXT_SSL3_ALLOWED 0x0008
43 /* Extension is only defined for TLS1.2 and above */
44 #define EXT_TLS1_2_AND_BELOW_ONLY 0x0010
45 /* Extension is only defined for TLS1.3 and above */
46 #define EXT_TLS1_3_ONLY 0x0020
47 #define EXT_CLIENT_HELLO 0x0040
48 /* Really means TLS1.2 or below */
49 #define EXT_TLS1_2_SERVER_HELLO 0x0080
50 #define EXT_TLS1_3_SERVER_HELLO 0x0100
51 #define EXT_TLS1_3_ENCRYPTED_EXTENSIONS 0x0200
52 #define EXT_TLS1_3_HELLO_RETRY_REQUEST 0x0400
53 #define EXT_TLS1_3_CERTIFICATE 0x0800
54 #define EXT_TLS1_3_NEW_SESSION_TICKET 0x1000
56 /* Message processing return codes */
58 /* Something bad happened */
60 /* We've finished reading - swap to writing */
61 MSG_PROCESS_FINISHED_READING,
63 * We've completed the main processing of this message but there is some
64 * post processing to be done.
66 MSG_PROCESS_CONTINUE_PROCESSING,
67 /* We've finished this message - read the next message */
68 MSG_PROCESS_CONTINUE_READING
71 /* Flush the write BIO */
72 int statem_flush(SSL *s);
74 typedef int (*confunc_f) (SSL *s, WPACKET *pkt);
76 int check_in_list(SSL *s, unsigned int group_id, const unsigned char *groups,
77 size_t num_groups, int checkallow);
80 * TLS/DTLS client state machine functions
82 int ossl_statem_client_read_transition(SSL *s, int mt);
83 WRITE_TRAN ossl_statem_client_write_transition(SSL *s);
84 WORK_STATE ossl_statem_client_pre_work(SSL *s, WORK_STATE wst);
85 WORK_STATE ossl_statem_client_post_work(SSL *s, WORK_STATE wst);
86 int ossl_statem_client_construct_message(SSL *s, WPACKET *pkt,
87 confunc_f *confunc, int *mt);
88 size_t ossl_statem_client_max_message_size(SSL *s);
89 MSG_PROCESS_RETURN ossl_statem_client_process_message(SSL *s, PACKET *pkt);
90 WORK_STATE ossl_statem_client_post_process_message(SSL *s, WORK_STATE wst);
93 * TLS/DTLS server state machine functions
95 int ossl_statem_server_read_transition(SSL *s, int mt);
96 WRITE_TRAN ossl_statem_server_write_transition(SSL *s);
97 WORK_STATE ossl_statem_server_pre_work(SSL *s, WORK_STATE wst);
98 WORK_STATE ossl_statem_server_post_work(SSL *s, WORK_STATE wst);
99 int ossl_statem_server_construct_message(SSL *s, WPACKET *pkt,
100 confunc_f *confunc,int *mt);
101 size_t ossl_statem_server_max_message_size(SSL *s);
102 MSG_PROCESS_RETURN ossl_statem_server_process_message(SSL *s, PACKET *pkt);
103 WORK_STATE ossl_statem_server_post_process_message(SSL *s, WORK_STATE wst);
105 /* Functions for getting new message data */
106 __owur int tls_get_message_header(SSL *s, int *mt);
107 __owur int tls_get_message_body(SSL *s, size_t *len);
108 __owur int dtls_get_message(SSL *s, int *mt, size_t *len);
110 /* Message construction and processing functions */
111 __owur int tls_process_initial_server_flight(SSL *s, int *al);
112 __owur MSG_PROCESS_RETURN tls_process_change_cipher_spec(SSL *s, PACKET *pkt);
113 __owur MSG_PROCESS_RETURN tls_process_finished(SSL *s, PACKET *pkt);
114 __owur int tls_construct_change_cipher_spec(SSL *s, WPACKET *pkt);
115 __owur int dtls_construct_change_cipher_spec(SSL *s, WPACKET *pkt);
117 __owur int tls_construct_finished(SSL *s, WPACKET *pkt);
118 __owur int tls_construct_key_update(SSL *s, WPACKET *pkt);
119 __owur MSG_PROCESS_RETURN tls_process_key_update(SSL *s, PACKET *pkt);
120 __owur WORK_STATE tls_finish_handshake(SSL *s, WORK_STATE wst, int clearbufs);
121 __owur WORK_STATE dtls_wait_for_dry(SSL *s);
123 /* some client-only functions */
124 __owur int tls_construct_client_hello(SSL *s, WPACKET *pkt);
125 __owur MSG_PROCESS_RETURN tls_process_server_hello(SSL *s, PACKET *pkt);
126 __owur MSG_PROCESS_RETURN tls_process_certificate_request(SSL *s, PACKET *pkt);
127 __owur MSG_PROCESS_RETURN tls_process_new_session_ticket(SSL *s, PACKET *pkt);
128 __owur int tls_process_cert_status_body(SSL *s, PACKET *pkt, int *al);
129 __owur MSG_PROCESS_RETURN tls_process_cert_status(SSL *s, PACKET *pkt);
130 __owur MSG_PROCESS_RETURN tls_process_server_done(SSL *s, PACKET *pkt);
131 __owur int tls_construct_cert_verify(SSL *s, WPACKET *pkt);
132 __owur WORK_STATE tls_prepare_client_certificate(SSL *s, WORK_STATE wst);
133 __owur int tls_construct_client_certificate(SSL *s, WPACKET *pkt);
134 __owur int ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey);
135 __owur int tls_construct_client_key_exchange(SSL *s, WPACKET *pkt);
136 __owur int tls_client_key_exchange_post_work(SSL *s);
137 __owur int tls_construct_cert_status_body(SSL *s, WPACKET *pkt);
138 __owur int tls_construct_cert_status(SSL *s, WPACKET *pkt);
139 __owur MSG_PROCESS_RETURN tls_process_key_exchange(SSL *s, PACKET *pkt);
140 __owur MSG_PROCESS_RETURN tls_process_server_certificate(SSL *s, PACKET *pkt);
141 __owur int ssl3_check_cert_and_algorithm(SSL *s);
142 #ifndef OPENSSL_NO_NEXTPROTONEG
143 __owur int tls_construct_next_proto(SSL *s, WPACKET *pkt);
145 __owur MSG_PROCESS_RETURN tls_process_hello_req(SSL *s, PACKET *pkt);
146 __owur MSG_PROCESS_RETURN dtls_process_hello_verify(SSL *s, PACKET *pkt);
148 /* some server-only functions */
149 __owur MSG_PROCESS_RETURN tls_process_client_hello(SSL *s, PACKET *pkt);
150 __owur WORK_STATE tls_post_process_client_hello(SSL *s, WORK_STATE wst);
151 __owur int tls_construct_server_hello(SSL *s, WPACKET *pkt);
152 __owur int dtls_construct_hello_verify_request(SSL *s, WPACKET *pkt);
153 __owur int tls_construct_server_certificate(SSL *s, WPACKET *pkt);
154 __owur int tls_construct_server_key_exchange(SSL *s, WPACKET *pkt);
155 __owur int tls_construct_certificate_request(SSL *s, WPACKET *pkt);
156 __owur int tls_construct_server_done(SSL *s, WPACKET *pkt);
157 __owur MSG_PROCESS_RETURN tls_process_client_certificate(SSL *s, PACKET *pkt);
158 __owur MSG_PROCESS_RETURN tls_process_client_key_exchange(SSL *s, PACKET *pkt);
159 __owur WORK_STATE tls_post_process_client_key_exchange(SSL *s, WORK_STATE wst);
160 __owur MSG_PROCESS_RETURN tls_process_cert_verify(SSL *s, PACKET *pkt);
161 #ifndef OPENSSL_NO_NEXTPROTONEG
162 __owur MSG_PROCESS_RETURN tls_process_next_proto(SSL *s, PACKET *pkt);
164 __owur int tls_construct_new_session_ticket(SSL *s, WPACKET *pkt);
167 /* Extension processing */
169 __owur int tls_collect_extensions(SSL *s, PACKET *packet, unsigned int context,
170 RAW_EXTENSION **res, int *al, size_t *len);
171 __owur int tls_parse_extension(SSL *s, TLSEXT_INDEX idx, int context,
172 RAW_EXTENSION *exts, X509 *x, size_t chainidx,
174 __owur int tls_parse_all_extensions(SSL *s, int context, RAW_EXTENSION *exts,
175 X509 *x, size_t chainidx, int *al);
176 __owur int tls_construct_extensions(SSL *s, WPACKET *pkt, unsigned int context,
177 X509 *x, size_t chainidx, int *al);
179 __owur int tls_psk_do_binder(SSL *s, const EVP_MD *md,
180 const unsigned char *msgstart,
181 size_t binderoffset, const unsigned char *binderin,
182 unsigned char *binderout,
183 SSL_SESSION *sess, int sign);
185 /* Server Extension processing */
186 int tls_parse_ctos_renegotiate(SSL *s, PACKET *pkt, unsigned int context,
187 X509 *x, size_t chainidx, int *al);
188 int tls_parse_ctos_server_name(SSL *s, PACKET *pkt, unsigned int context,
189 X509 *x, size_t chainidx, int *al);
190 #ifndef OPENSSL_NO_SRP
191 int tls_parse_ctos_srp(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
192 size_t chainidx, int *al);
194 int tls_parse_ctos_early_data(SSL *s, PACKET *pkt, unsigned int context,
195 X509 *x, size_t chainidx, int *al);
196 #ifndef OPENSSL_NO_EC
197 int tls_parse_ctos_ec_pt_formats(SSL *s, PACKET *pkt, unsigned int context,
198 X509 *x, size_t chainidx, int *al);
199 int tls_parse_ctos_supported_groups(SSL *s, PACKET *pkt, unsigned int context,
200 X509 *x, size_t chainidx, int *al);
202 int tls_parse_ctos_session_ticket(SSL *s, PACKET *pkt, unsigned int context,
203 X509 *x, size_t chainidx, int *al);
204 int tls_parse_ctos_sig_algs(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
205 size_t chainidx, int *al);
206 #ifndef OPENSSL_NO_OCSP
207 int tls_parse_ctos_status_request(SSL *s, PACKET *pkt, unsigned int context,
208 X509 *x, size_t chainidx, int *al);
210 #ifndef OPENSSL_NO_NEXTPROTONEG
211 int tls_parse_ctos_npn(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
212 size_t chainidx, int *al);
214 int tls_parse_ctos_alpn(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
215 size_t chainidx, int *al);
216 #ifndef OPENSSL_NO_SRTP
217 int tls_parse_ctos_use_srtp(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
218 size_t chainidx, int *al);
220 int tls_parse_ctos_etm(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
221 size_t chainidx, int *al);
222 int tls_parse_ctos_key_share(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
223 size_t chainidx, int *al);
224 int tls_parse_ctos_ems(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
225 size_t chainidx, int *al);
226 int tls_parse_ctos_psk_kex_modes(SSL *s, PACKET *pkt, unsigned int context,
227 X509 *x, size_t chainidx, int *al);
228 int tls_parse_ctos_psk(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
229 size_t chainidx, int *al);
231 int tls_construct_stoc_renegotiate(SSL *s, WPACKET *pkt, unsigned int context,
232 X509 *x, size_t chainidx, int *al);
233 int tls_construct_stoc_server_name(SSL *s, WPACKET *pkt, unsigned int context,
234 X509 *x, size_t chainidx, int *al);
235 int tls_construct_stoc_early_data_info(SSL *s, WPACKET *pkt,
236 unsigned int context, X509 *x,
237 size_t chainidx, int *al);
238 int tls_construct_stoc_early_data(SSL *s, WPACKET *pkt, unsigned int context,
239 X509 *x, size_t chainidx, int *al);
240 #ifndef OPENSSL_NO_EC
241 int tls_construct_stoc_ec_pt_formats(SSL *s, WPACKET *pkt, unsigned int context,
242 X509 *x, size_t chainidx, int *al);
244 int tls_construct_stoc_session_ticket(SSL *s, WPACKET *pkt,
245 unsigned int context, X509 *x,
246 size_t chainidx, int *al);
247 #ifndef OPENSSL_NO_OCSP
248 int tls_construct_stoc_status_request(SSL *s, WPACKET *pkt,
249 unsigned int context, X509 *x,
250 size_t chainidx, int *al);
252 #ifndef OPENSSL_NO_NEXTPROTONEG
253 int tls_construct_stoc_next_proto_neg(SSL *s, WPACKET *pkt,
254 unsigned int context, X509 *x,
255 size_t chainidx, int *al);
257 int tls_construct_stoc_alpn(SSL *s, WPACKET *pkt, unsigned int context, X509 *x,
258 size_t chainidx, int *al);
259 #ifndef OPENSSL_NO_SRTP
260 int tls_construct_stoc_use_srtp(SSL *s, WPACKET *pkt, unsigned int context,
261 X509 *x, size_t chainidx, int *al);
263 int tls_construct_stoc_etm(SSL *s, WPACKET *pkt, unsigned int context, X509 *x,
264 size_t chainidx, int *al);
265 int tls_construct_stoc_ems(SSL *s, WPACKET *pkt, unsigned int context, X509 *x,
266 size_t chainidx, int *al);
267 int tls_construct_stoc_key_share(SSL *s, WPACKET *pkt, unsigned int context,
268 X509 *x, size_t chainidx, int *al);
270 * Not in public headers as this is not an official extension. Only used when
271 * SSL_OP_CRYPTOPRO_TLSEXT_BUG is set.
273 #define TLSEXT_TYPE_cryptopro_bug 0xfde8
274 int tls_construct_stoc_cryptopro_bug(SSL *s, WPACKET *pkt, unsigned int context,
275 X509 *x, size_t chainidx, int *al);
276 int tls_construct_stoc_psk(SSL *s, WPACKET *pkt, unsigned int context, X509 *x,
277 size_t chainidx, int *al);
279 /* Client Extension processing */
280 int tls_construct_ctos_renegotiate(SSL *s, WPACKET *pkt, unsigned int context,
281 X509 *x, size_t chainidx, int *al);
282 int tls_construct_ctos_server_name(SSL *s, WPACKET *pkt, unsigned int context,
283 X509 *x, size_t chainidx, int *al);
284 #ifndef OPENSSL_NO_SRP
285 int tls_construct_ctos_srp(SSL *s, WPACKET *pkt, unsigned int context, X509 *x,
286 size_t chainidx, int *al);
288 #ifndef OPENSSL_NO_EC
289 int tls_construct_ctos_ec_pt_formats(SSL *s, WPACKET *pkt, unsigned int context,
290 X509 *x, size_t chainidx, int *al);
291 int tls_construct_ctos_supported_groups(SSL *s, WPACKET *pkt,
292 unsigned int context, X509 *x,
293 size_t chainidx, int *al);
295 int tls_construct_ctos_early_data(SSL *s, WPACKET *pkt, unsigned int context,
296 X509 *x, size_t chainidx, int *al);
297 int tls_construct_ctos_session_ticket(SSL *s, WPACKET *pkt,
298 unsigned int context, X509 *x,
299 size_t chainidx, int *al);
300 int tls_construct_ctos_sig_algs(SSL *s, WPACKET *pkt, unsigned int context,
301 X509 *x, size_t chainidx, int *al);
302 #ifndef OPENSSL_NO_OCSP
303 int tls_construct_ctos_status_request(SSL *s, WPACKET *pkt,
304 unsigned int context, X509 *x,
305 size_t chainidx, int *al);
307 #ifndef OPENSSL_NO_NEXTPROTONEG
308 int tls_construct_ctos_npn(SSL *s, WPACKET *pkt, unsigned int context, X509 *x,
309 size_t chainidx, int *al);
311 int tls_construct_ctos_alpn(SSL *s, WPACKET *pkt, unsigned int context, X509 *x,
312 size_t chainidx, int *al);
313 #ifndef OPENSSL_NO_SRTP
314 int tls_construct_ctos_use_srtp(SSL *s, WPACKET *pkt, unsigned int context,
315 X509 *x, size_t chainidx, int *al);
317 int tls_construct_ctos_etm(SSL *s, WPACKET *pkt, unsigned int context, X509 *x,
318 size_t chainidx, int *al);
319 #ifndef OPENSSL_NO_CT
320 int tls_construct_ctos_sct(SSL *s, WPACKET *pkt, unsigned int context, X509 *x,
321 size_t chainidx, int *al);
323 int tls_construct_ctos_ems(SSL *s, WPACKET *pkt, unsigned int context, X509 *x,
324 size_t chainidx, int *al);
325 int tls_construct_ctos_supported_versions(SSL *s, WPACKET *pkt,
326 unsigned int context, X509 *x,
327 size_t chainidx, int *al);
328 int tls_construct_ctos_key_share(SSL *s, WPACKET *pkt, unsigned int context,
329 X509 *x, size_t chainidx, int *al);
330 int tls_construct_ctos_psk_kex_modes(SSL *s, WPACKET *pkt, unsigned int context,
331 X509 *x, size_t chainidx, int *al);
332 int tls_construct_ctos_padding(SSL *s, WPACKET *pkt, unsigned int context,
333 X509 *x, size_t chainidx, int *al);
334 int tls_construct_ctos_psk(SSL *s, WPACKET *pkt, unsigned int context, X509 *x,
335 size_t chainidx, int *al);
336 int tls_parse_stoc_renegotiate(SSL *s, PACKET *pkt, unsigned int context,
337 X509 *x, size_t chainidx, int *al);
338 int tls_parse_stoc_server_name(SSL *s, PACKET *pkt, unsigned int context,
339 X509 *x, size_t chainidx, int *al);
340 int tls_parse_stoc_early_data_info(SSL *s, PACKET *pkt, unsigned int context,
341 X509 *x, size_t chainidx, int *al);
342 #ifndef OPENSSL_NO_EC
343 int tls_parse_stoc_ec_pt_formats(SSL *s, PACKET *pkt, unsigned int context,
344 X509 *x, size_t chainidx, int *al);
346 int tls_parse_stoc_session_ticket(SSL *s, PACKET *pkt, unsigned int context,
347 X509 *x, size_t chainidx, int *al);
348 #ifndef OPENSSL_NO_OCSP
349 int tls_parse_stoc_status_request(SSL *s, PACKET *pkt, unsigned int context,
350 X509 *x, size_t chainidx, int *al);
352 #ifndef OPENSSL_NO_CT
353 int tls_parse_stoc_sct(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
354 size_t chainidx, int *al);
356 #ifndef OPENSSL_NO_NEXTPROTONEG
357 int tls_parse_stoc_npn(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
358 size_t chainidx, int *al);
360 int tls_parse_stoc_alpn(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
361 size_t chainidx, int *al);
362 #ifndef OPENSSL_NO_SRTP
363 int tls_parse_stoc_use_srtp(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
364 size_t chainidx, int *al);
366 int tls_parse_stoc_etm(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
367 size_t chainidx, int *al);
368 int tls_parse_stoc_ems(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
369 size_t chainidx, int *al);
370 int tls_parse_stoc_key_share(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
371 size_t chainidx, int *al);
372 int tls_parse_stoc_psk(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
373 size_t chainidx, int *al);