9c8c753ccab42555b678cb209902a7c5c970bb92
[openssl.git] / ssl / statem / statem_locl.h
1 /*
2  * Copyright 2015-2018 The OpenSSL Project Authors. All Rights Reserved.
3  *
4  * Licensed under the Apache License 2.0 (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
8  */
9
10 /*****************************************************************************
11  *                                                                           *
12  * The following definitions are PRIVATE to the state machine. They should   *
13  * NOT be used outside of the state machine.                                 *
14  *                                                                           *
15  *****************************************************************************/
16
17 /* Max message length definitions */
18
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
31
32 /* The maximum number of incoming KeyUpdate messages we will accept */
33 #define MAX_KEY_UPDATE_MESSAGES     32
34
35 /* Dummy message type */
36 #define SSL3_MT_DUMMY   -1
37
38 extern const unsigned char hrrrandom[];
39
40 /* Message processing return codes */
41 typedef enum {
42     /* Something bad happened */
43     MSG_PROCESS_ERROR,
44     /* We've finished reading - swap to writing */
45     MSG_PROCESS_FINISHED_READING,
46     /*
47      * We've completed the main processing of this message but there is some
48      * post processing to be done.
49      */
50     MSG_PROCESS_CONTINUE_PROCESSING,
51     /* We've finished this message - read the next message */
52     MSG_PROCESS_CONTINUE_READING
53 } MSG_PROCESS_RETURN;
54
55 typedef int (*confunc_f) (SSL *s, WPACKET *pkt);
56
57 int ssl3_take_mac(SSL *s);
58 int check_in_list(SSL *s, uint16_t group_id, const uint16_t *groups,
59                   size_t num_groups, int checkallow);
60 int create_synthetic_message_hash(SSL *s, const unsigned char *hashval,
61                                   size_t hashlen, const unsigned char *hrr,
62                                   size_t hrrlen);
63 int parse_ca_names(SSL *s, PACKET *pkt);
64 const STACK_OF(X509_NAME) *get_ca_names(SSL *s);
65 int construct_ca_names(SSL *s, const STACK_OF(X509_NAME) *ca_sk, WPACKET *pkt);
66 size_t construct_key_exchange_tbs(SSL *s, unsigned char **ptbs,
67                                   const void *param, size_t paramlen);
68
69 /*
70  * TLS/DTLS client state machine functions
71  */
72 int ossl_statem_client_read_transition(SSL *s, int mt);
73 WRITE_TRAN ossl_statem_client_write_transition(SSL *s);
74 WORK_STATE ossl_statem_client_pre_work(SSL *s, WORK_STATE wst);
75 WORK_STATE ossl_statem_client_post_work(SSL *s, WORK_STATE wst);
76 int ossl_statem_client_construct_message(SSL *s, WPACKET *pkt,
77                                          confunc_f *confunc, int *mt);
78 size_t ossl_statem_client_max_message_size(SSL *s);
79 MSG_PROCESS_RETURN ossl_statem_client_process_message(SSL *s, PACKET *pkt);
80 WORK_STATE ossl_statem_client_post_process_message(SSL *s, WORK_STATE wst);
81
82 /*
83  * TLS/DTLS server state machine functions
84  */
85 int ossl_statem_server_read_transition(SSL *s, int mt);
86 WRITE_TRAN ossl_statem_server_write_transition(SSL *s);
87 WORK_STATE ossl_statem_server_pre_work(SSL *s, WORK_STATE wst);
88 WORK_STATE ossl_statem_server_post_work(SSL *s, WORK_STATE wst);
89 int ossl_statem_server_construct_message(SSL *s, WPACKET *pkt,
90                                          confunc_f *confunc,int *mt);
91 size_t ossl_statem_server_max_message_size(SSL *s);
92 MSG_PROCESS_RETURN ossl_statem_server_process_message(SSL *s, PACKET *pkt);
93 WORK_STATE ossl_statem_server_post_process_message(SSL *s, WORK_STATE wst);
94
95 /* Functions for getting new message data */
96 __owur int tls_get_message_header(SSL *s, int *mt);
97 __owur int tls_get_message_body(SSL *s, size_t *len);
98 __owur int dtls_get_message(SSL *s, int *mt, size_t *len);
99
100 /* Message construction and processing functions */
101 __owur int tls_process_initial_server_flight(SSL *s);
102 __owur MSG_PROCESS_RETURN tls_process_change_cipher_spec(SSL *s, PACKET *pkt);
103 __owur MSG_PROCESS_RETURN tls_process_finished(SSL *s, PACKET *pkt);
104 __owur int tls_construct_change_cipher_spec(SSL *s, WPACKET *pkt);
105 __owur int dtls_construct_change_cipher_spec(SSL *s, WPACKET *pkt);
106
107 __owur int tls_construct_finished(SSL *s, WPACKET *pkt);
108 __owur int tls_construct_key_update(SSL *s, WPACKET *pkt);
109 __owur MSG_PROCESS_RETURN tls_process_key_update(SSL *s, PACKET *pkt);
110 __owur WORK_STATE tls_finish_handshake(SSL *s, WORK_STATE wst, int clearbufs,
111                                        int stop);
112 __owur WORK_STATE dtls_wait_for_dry(SSL *s);
113
114 /* some client-only functions */
115 __owur int tls_construct_client_hello(SSL *s, WPACKET *pkt);
116 __owur MSG_PROCESS_RETURN tls_process_server_hello(SSL *s, PACKET *pkt);
117 __owur MSG_PROCESS_RETURN tls_process_certificate_request(SSL *s, PACKET *pkt);
118 __owur MSG_PROCESS_RETURN tls_process_new_session_ticket(SSL *s, PACKET *pkt);
119 __owur int tls_process_cert_status_body(SSL *s, PACKET *pkt);
120 __owur MSG_PROCESS_RETURN tls_process_cert_status(SSL *s, PACKET *pkt);
121 __owur MSG_PROCESS_RETURN tls_process_server_done(SSL *s, PACKET *pkt);
122 __owur int tls_construct_cert_verify(SSL *s, WPACKET *pkt);
123 __owur WORK_STATE tls_prepare_client_certificate(SSL *s, WORK_STATE wst);
124 __owur int tls_construct_client_certificate(SSL *s, WPACKET *pkt);
125 __owur int ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey);
126 __owur int tls_construct_client_key_exchange(SSL *s, WPACKET *pkt);
127 __owur int tls_client_key_exchange_post_work(SSL *s);
128 __owur int tls_construct_cert_status_body(SSL *s, WPACKET *pkt);
129 __owur int tls_construct_cert_status(SSL *s, WPACKET *pkt);
130 __owur MSG_PROCESS_RETURN tls_process_key_exchange(SSL *s, PACKET *pkt);
131 __owur MSG_PROCESS_RETURN tls_process_server_certificate(SSL *s, PACKET *pkt);
132 __owur int ssl3_check_cert_and_algorithm(SSL *s);
133 #ifndef OPENSSL_NO_NEXTPROTONEG
134 __owur int tls_construct_next_proto(SSL *s, WPACKET *pkt);
135 #endif
136 __owur MSG_PROCESS_RETURN tls_process_hello_req(SSL *s, PACKET *pkt);
137 __owur MSG_PROCESS_RETURN dtls_process_hello_verify(SSL *s, PACKET *pkt);
138 __owur int tls_construct_end_of_early_data(SSL *s, WPACKET *pkt);
139
140 /* some server-only functions */
141 __owur MSG_PROCESS_RETURN tls_process_client_hello(SSL *s, PACKET *pkt);
142 __owur WORK_STATE tls_post_process_client_hello(SSL *s, WORK_STATE wst);
143 __owur int tls_construct_server_hello(SSL *s, WPACKET *pkt);
144 __owur int dtls_construct_hello_verify_request(SSL *s, WPACKET *pkt);
145 __owur int tls_construct_server_certificate(SSL *s, WPACKET *pkt);
146 __owur int tls_construct_server_key_exchange(SSL *s, WPACKET *pkt);
147 __owur int tls_construct_certificate_request(SSL *s, WPACKET *pkt);
148 __owur int tls_construct_server_done(SSL *s, WPACKET *pkt);
149 __owur MSG_PROCESS_RETURN tls_process_client_certificate(SSL *s, PACKET *pkt);
150 __owur MSG_PROCESS_RETURN tls_process_client_key_exchange(SSL *s, PACKET *pkt);
151 __owur WORK_STATE tls_post_process_client_key_exchange(SSL *s, WORK_STATE wst);
152 __owur MSG_PROCESS_RETURN tls_process_cert_verify(SSL *s, PACKET *pkt);
153 #ifndef OPENSSL_NO_NEXTPROTONEG
154 __owur MSG_PROCESS_RETURN tls_process_next_proto(SSL *s, PACKET *pkt);
155 #endif
156 __owur int tls_construct_new_session_ticket(SSL *s, WPACKET *pkt);
157 MSG_PROCESS_RETURN tls_process_end_of_early_data(SSL *s, PACKET *pkt);
158
159
160 /* Extension processing */
161
162 typedef enum ext_return_en {
163     EXT_RETURN_FAIL,
164     EXT_RETURN_SENT,
165     EXT_RETURN_NOT_SENT
166 } EXT_RETURN;
167
168 __owur int tls_validate_all_contexts(SSL *s, unsigned int thisctx,
169                                      RAW_EXTENSION *exts);
170 __owur int extension_is_relevant(SSL *s, unsigned int extctx,
171                                  unsigned int thisctx);
172 __owur int tls_collect_extensions(SSL *s, PACKET *packet, unsigned int context,
173                                   RAW_EXTENSION **res, size_t *len, int init);
174 __owur int tls_parse_extension(SSL *s, TLSEXT_INDEX idx, int context,
175                                RAW_EXTENSION *exts,  X509 *x, size_t chainidx);
176 __owur int tls_parse_all_extensions(SSL *s, int context, RAW_EXTENSION *exts,
177                                     X509 *x, size_t chainidx, int fin);
178 __owur int should_add_extension(SSL *s, unsigned int extctx,
179                                 unsigned int thisctx, int max_version);
180 __owur int tls_construct_extensions(SSL *s, WPACKET *pkt, unsigned int context,
181                                     X509 *x, size_t chainidx);
182
183 __owur int tls_psk_do_binder(SSL *s, const EVP_MD *md,
184                              const unsigned char *msgstart,
185                              size_t binderoffset, const unsigned char *binderin,
186                              unsigned char *binderout,
187                              SSL_SESSION *sess, int sign, int external);
188
189 /* Server Extension processing */
190 int tls_parse_ctos_renegotiate(SSL *s, PACKET *pkt, unsigned int context,
191                                X509 *x, size_t chainidx);
192 int tls_parse_ctos_server_name(SSL *s, PACKET *pkt, unsigned int context,
193                                X509 *x, size_t chainidx);
194 int tls_parse_ctos_maxfragmentlen(SSL *s, PACKET *pkt, unsigned int context,
195                                   X509 *x, size_t chainidx);
196 #ifndef OPENSSL_NO_SRP
197 int tls_parse_ctos_srp(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
198                        size_t chainidx);
199 #endif
200 int tls_parse_ctos_early_data(SSL *s, PACKET *pkt, unsigned int context,
201                               X509 *x, size_t chainidx);
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);
205 int tls_parse_ctos_supported_groups(SSL *s, PACKET *pkt, unsigned int context,
206                                     X509 *x, size_t chainidxl);
207 #endif
208 int tls_parse_ctos_session_ticket(SSL *s, PACKET *pkt, unsigned int context,
209                                   X509 *x, size_t chainidx);
210 int tls_parse_ctos_sig_algs_cert(SSL *s, PACKET *pkt, unsigned int context,
211                                  X509 *x, size_t chainidx);
212 int tls_parse_ctos_sig_algs(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
213                             size_t chainidx);
214 #ifndef OPENSSL_NO_OCSP
215 int tls_parse_ctos_status_request(SSL *s, PACKET *pkt, unsigned int context,
216                                   X509 *x, size_t chainidx);
217 #endif
218 #ifndef OPENSSL_NO_NEXTPROTONEG
219 int tls_parse_ctos_npn(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
220                        size_t chainidx);
221 #endif
222 int tls_parse_ctos_alpn(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
223                         size_t chainidx);
224 #ifndef OPENSSL_NO_SRTP
225 int tls_parse_ctos_use_srtp(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
226                             size_t chainidx);
227 #endif
228 int tls_parse_ctos_etm(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
229                        size_t chainidx);
230 int tls_parse_ctos_key_share(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
231                              size_t chainidx);
232 int tls_parse_ctos_cookie(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
233                           size_t chainidx);
234 int tls_parse_ctos_ems(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
235                        size_t chainidx);
236 int tls_parse_ctos_psk_kex_modes(SSL *s, PACKET *pkt, unsigned int context,
237                                  X509 *x, size_t chainidx);
238 int tls_parse_ctos_psk(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
239                        size_t chainidx);
240 int tls_parse_ctos_post_handshake_auth(SSL *, PACKET *pkt, unsigned int context,
241                                        X509 *x, size_t chainidx);
242
243 EXT_RETURN tls_construct_stoc_renegotiate(SSL *s, WPACKET *pkt,
244                                           unsigned int context, X509 *x,
245                                           size_t chainidx);
246 EXT_RETURN tls_construct_stoc_server_name(SSL *s, WPACKET *pkt,
247                                           unsigned int context, X509 *x,
248                                           size_t chainidx);
249 EXT_RETURN tls_construct_stoc_early_data(SSL *s, WPACKET *pkt,
250                                          unsigned int context, X509 *x,
251                                          size_t chainidx);
252 EXT_RETURN tls_construct_stoc_maxfragmentlen(SSL *s, WPACKET *pkt,
253                                              unsigned int context, X509 *x,
254                                              size_t chainidx);
255 #ifndef OPENSSL_NO_EC
256 EXT_RETURN tls_construct_stoc_ec_pt_formats(SSL *s, WPACKET *pkt,
257                                             unsigned int context, X509 *x,
258                                             size_t chainidx);
259 #endif
260 EXT_RETURN tls_construct_stoc_supported_groups(SSL *s, WPACKET *pkt,
261                                                unsigned int context, X509 *x,
262                                                size_t chainidx);
263 EXT_RETURN tls_construct_stoc_session_ticket(SSL *s, WPACKET *pkt,
264                                              unsigned int context, X509 *x,
265                                              size_t chainidx);
266 #ifndef OPENSSL_NO_OCSP
267 EXT_RETURN tls_construct_stoc_status_request(SSL *s, WPACKET *pkt,
268                                              unsigned int context, X509 *x,
269                                              size_t chainidx);
270 #endif
271 #ifndef OPENSSL_NO_NEXTPROTONEG
272 EXT_RETURN tls_construct_stoc_next_proto_neg(SSL *s, WPACKET *pkt,
273                                              unsigned int context, X509 *x,
274                                              size_t chainidx);
275 #endif
276 EXT_RETURN tls_construct_stoc_alpn(SSL *s, WPACKET *pkt, unsigned int context,
277                                    X509 *x, size_t chainidx);
278 #ifndef OPENSSL_NO_SRTP
279 EXT_RETURN tls_construct_stoc_use_srtp(SSL *s, WPACKET *pkt, unsigned int context,
280                                 X509 *x, size_t chainidx);
281 #endif
282 EXT_RETURN tls_construct_stoc_etm(SSL *s, WPACKET *pkt, unsigned int context,
283                                   X509 *x, size_t chainidx);
284 EXT_RETURN tls_construct_stoc_ems(SSL *s, WPACKET *pkt, unsigned int context,
285                                   X509 *x, size_t chainidx);
286 EXT_RETURN tls_construct_stoc_supported_versions(SSL *s, WPACKET *pkt,
287                                                  unsigned int context, X509 *x,
288                                                  size_t chainidx);
289 EXT_RETURN tls_construct_stoc_key_share(SSL *s, WPACKET *pkt,
290                                         unsigned int context, X509 *x,
291                                         size_t chainidx);
292 EXT_RETURN tls_construct_stoc_cookie(SSL *s, WPACKET *pkt, unsigned int context,
293                                      X509 *x, size_t chainidx);
294 /*
295  * Not in public headers as this is not an official extension. Only used when
296  * SSL_OP_CRYPTOPRO_TLSEXT_BUG is set.
297  */
298 #define TLSEXT_TYPE_cryptopro_bug      0xfde8
299 EXT_RETURN tls_construct_stoc_cryptopro_bug(SSL *s, WPACKET *pkt,
300                                             unsigned int context, X509 *x,
301                                             size_t chainidx);
302 EXT_RETURN tls_construct_stoc_psk(SSL *s, WPACKET *pkt, unsigned int context,
303                                   X509 *x, size_t chainidx);
304
305 /* Client Extension processing */
306 EXT_RETURN tls_construct_ctos_renegotiate(SSL *s, WPACKET *pkt, unsigned int context,
307                                    X509 *x, size_t chainidx);
308 EXT_RETURN tls_construct_ctos_server_name(SSL *s, WPACKET *pkt, unsigned int context,
309                                    X509 *x, size_t chainidx);
310 EXT_RETURN tls_construct_ctos_maxfragmentlen(SSL *s, WPACKET *pkt, unsigned int context,
311                                              X509 *x, size_t chainidx);
312 #ifndef OPENSSL_NO_SRP
313 EXT_RETURN tls_construct_ctos_srp(SSL *s, WPACKET *pkt, unsigned int context, X509 *x,
314                            size_t chainidx);
315 #endif
316 #ifndef OPENSSL_NO_EC
317 EXT_RETURN tls_construct_ctos_ec_pt_formats(SSL *s, WPACKET *pkt,
318                                             unsigned int context, X509 *x,
319                                             size_t chainidx);
320 EXT_RETURN tls_construct_ctos_supported_groups(SSL *s, WPACKET *pkt,
321                                                unsigned int context, X509 *x,
322                                                size_t chainidx);
323 #endif
324 EXT_RETURN tls_construct_ctos_early_data(SSL *s, WPACKET *pkt,
325                                          unsigned int context, X509 *x,
326                                          size_t chainidx);
327 EXT_RETURN tls_construct_ctos_session_ticket(SSL *s, WPACKET *pkt,
328                                              unsigned int context, X509 *x,
329                                              size_t chainidx);
330 EXT_RETURN tls_construct_ctos_sig_algs(SSL *s, WPACKET *pkt,
331                                        unsigned int context, X509 *x,
332                                        size_t chainidx);
333 #ifndef OPENSSL_NO_OCSP
334 EXT_RETURN tls_construct_ctos_status_request(SSL *s, WPACKET *pkt,
335                                              unsigned int context, X509 *x,
336                                              size_t chainidx);
337 #endif
338 #ifndef OPENSSL_NO_NEXTPROTONEG
339 EXT_RETURN tls_construct_ctos_npn(SSL *s, WPACKET *pkt, unsigned int context,
340                                   X509 *x, size_t chainidx);
341 #endif
342 EXT_RETURN tls_construct_ctos_alpn(SSL *s, WPACKET *pkt, unsigned int context,
343                                    X509 *x, size_t chainidx);
344 #ifndef OPENSSL_NO_SRTP
345 EXT_RETURN tls_construct_ctos_use_srtp(SSL *s, WPACKET *pkt, unsigned int context,
346                                        X509 *x, size_t chainidx);
347 #endif
348 EXT_RETURN tls_construct_ctos_etm(SSL *s, WPACKET *pkt, unsigned int context,
349                                   X509 *x, size_t chainidx);
350 #ifndef OPENSSL_NO_CT
351 EXT_RETURN tls_construct_ctos_sct(SSL *s, WPACKET *pkt, unsigned int context,
352                                   X509 *x, size_t chainidx);
353 #endif
354 EXT_RETURN tls_construct_ctos_ems(SSL *s, WPACKET *pkt, unsigned int context,
355                                   X509 *x, size_t chainidx);
356 EXT_RETURN tls_construct_ctos_supported_versions(SSL *s, WPACKET *pkt,
357                                                  unsigned int context, X509 *x,
358                                                  size_t chainidx);
359 EXT_RETURN tls_construct_ctos_key_share(SSL *s, WPACKET *pkt,
360                                         unsigned int context, X509 *x,
361                                         size_t chainidx);
362 EXT_RETURN tls_construct_ctos_psk_kex_modes(SSL *s, WPACKET *pkt,
363                                             unsigned int context, X509 *x,
364                                             size_t chainidx);
365 EXT_RETURN tls_construct_ctos_cookie(SSL *s, WPACKET *pkt, unsigned int context,
366                                      X509 *x, size_t chainidx);
367 EXT_RETURN tls_construct_ctos_padding(SSL *s, WPACKET *pkt,
368                                       unsigned int context, X509 *x,
369                                       size_t chainidx);
370 EXT_RETURN tls_construct_ctos_psk(SSL *s, WPACKET *pkt, unsigned int context,
371                                   X509 *x, size_t chainidx);
372 EXT_RETURN tls_construct_ctos_post_handshake_auth(SSL *s, WPACKET *pkt, unsigned int context,
373                                                   X509 *x, size_t chainidx);
374
375 int tls_parse_stoc_renegotiate(SSL *s, PACKET *pkt, unsigned int context,
376                                X509 *x, size_t chainidx);
377 int tls_parse_stoc_server_name(SSL *s, PACKET *pkt, unsigned int context,
378                                X509 *x, size_t chainidx);
379 int tls_parse_stoc_early_data(SSL *s, PACKET *pkt, unsigned int context,
380                               X509 *x, size_t chainidx);
381 int tls_parse_stoc_maxfragmentlen(SSL *s, PACKET *pkt, unsigned int context,
382                                   X509 *x, size_t chainidx);
383 #ifndef OPENSSL_NO_EC
384 int tls_parse_stoc_ec_pt_formats(SSL *s, PACKET *pkt, unsigned int context,
385                                  X509 *x, size_t chainidx);
386 #endif
387 int tls_parse_stoc_session_ticket(SSL *s, PACKET *pkt, unsigned int context,
388                                   X509 *x, size_t chainidx);
389 #ifndef OPENSSL_NO_OCSP
390 int tls_parse_stoc_status_request(SSL *s, PACKET *pkt, unsigned int context,
391                                   X509 *x, size_t chainidx);
392 #endif
393 #ifndef OPENSSL_NO_CT
394 int tls_parse_stoc_sct(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
395                        size_t chainidx);
396 #endif
397 #ifndef OPENSSL_NO_NEXTPROTONEG
398 int tls_parse_stoc_npn(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
399                        size_t chainidx);
400 #endif
401 int tls_parse_stoc_alpn(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
402                         size_t chainidx);
403 #ifndef OPENSSL_NO_SRTP
404 int tls_parse_stoc_use_srtp(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
405                             size_t chainidx);
406 #endif
407 int tls_parse_stoc_etm(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
408                        size_t chainidx);
409 int tls_parse_stoc_ems(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
410                        size_t chainidx);
411 int tls_parse_stoc_supported_versions(SSL *s, PACKET *pkt, unsigned int context,
412                                       X509 *x, size_t chainidx);
413 int tls_parse_stoc_key_share(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
414                              size_t chainidx);
415 int tls_parse_stoc_cookie(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
416                        size_t chainidx);
417 int tls_parse_stoc_psk(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
418                        size_t chainidx);
419
420 int tls_handle_alpn(SSL *s);
421
422 int tls13_save_handshake_digest_for_pha(SSL *s);
423 int tls13_restore_handshake_digest_for_pha(SSL *s);