ssl/statem/statem_locl.h

   1 /*
   2  * Copyright 2015-2017 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   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
   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 /* Flush the write BIO */
  56 int statem_flush(SSL *s);
  57
  58 typedef int (*confunc_f) (SSL *s, WPACKET *pkt);
  59
  60 int check_in_list(SSL *s, uint16_t group_id, const uint16_t *groups,
  61                   size_t num_groups, int checkallow);
  62 int create_synthetic_message_hash(SSL *s);
  63 int parse_ca_names(SSL *s, PACKET *pkt);
  64 int construct_ca_names(SSL *s, WPACKET *pkt);
  65 size_t construct_key_exchange_tbs(SSL *s, unsigned char **ptbs,
  66                                   const void *param, size_t paramlen);
  67
  68 /*
  69  * TLS/DTLS client state machine functions
  70  */
  71 int ossl_statem_client_read_transition(SSL *s, int mt);
  72 WRITE_TRAN ossl_statem_client_write_transition(SSL *s);
  73 WORK_STATE ossl_statem_client_pre_work(SSL *s, WORK_STATE wst);
  74 WORK_STATE ossl_statem_client_post_work(SSL *s, WORK_STATE wst);
  75 int ossl_statem_client_construct_message(SSL *s, WPACKET *pkt,
  76                                          confunc_f *confunc, int *mt);
  77 size_t ossl_statem_client_max_message_size(SSL *s);
  78 MSG_PROCESS_RETURN ossl_statem_client_process_message(SSL *s, PACKET *pkt);
  79 WORK_STATE ossl_statem_client_post_process_message(SSL *s, WORK_STATE wst);
  80
  81 /*
  82  * TLS/DTLS server state machine functions
  83  */
  84 int ossl_statem_server_read_transition(SSL *s, int mt);
  85 WRITE_TRAN ossl_statem_server_write_transition(SSL *s);
  86 WORK_STATE ossl_statem_server_pre_work(SSL *s, WORK_STATE wst);
  87 WORK_STATE ossl_statem_server_post_work(SSL *s, WORK_STATE wst);
  88 int ossl_statem_server_construct_message(SSL *s, WPACKET *pkt,
  89                                          confunc_f *confunc,int *mt);
  90 size_t ossl_statem_server_max_message_size(SSL *s);
  91 MSG_PROCESS_RETURN ossl_statem_server_process_message(SSL *s, PACKET *pkt);
  92 WORK_STATE ossl_statem_server_post_process_message(SSL *s, WORK_STATE wst);
  93
  94 /* Functions for getting new message data */
  95 __owur int tls_get_message_header(SSL *s, int *mt);
  96 __owur int tls_get_message_body(SSL *s, size_t *len);
  97 __owur int dtls_get_message(SSL *s, int *mt, size_t *len);
  98
  99 /* Message construction and processing functions */
 100 __owur int tls_process_initial_server_flight(SSL *s);
 101 __owur MSG_PROCESS_RETURN tls_process_change_cipher_spec(SSL *s, PACKET *pkt);
 102 __owur MSG_PROCESS_RETURN tls_process_finished(SSL *s, PACKET *pkt);
 103 __owur int tls_construct_change_cipher_spec(SSL *s, WPACKET *pkt);
 104 __owur int dtls_construct_change_cipher_spec(SSL *s, WPACKET *pkt);
 105
 106 __owur int tls_construct_finished(SSL *s, WPACKET *pkt);
 107 __owur int tls_construct_key_update(SSL *s, WPACKET *pkt);
 108 __owur MSG_PROCESS_RETURN tls_process_key_update(SSL *s, PACKET *pkt);
 109 __owur WORK_STATE tls_finish_handshake(SSL *s, WORK_STATE wst, int clearbufs);
 110 __owur WORK_STATE dtls_wait_for_dry(SSL *s);
 111
 112 /* some client-only functions */
 113 __owur int tls_construct_client_hello(SSL *s, WPACKET *pkt);
 114 __owur MSG_PROCESS_RETURN tls_process_server_hello(SSL *s, PACKET *pkt);
 115 __owur MSG_PROCESS_RETURN tls_process_certificate_request(SSL *s, PACKET *pkt);
 116 __owur MSG_PROCESS_RETURN tls_process_new_session_ticket(SSL *s, PACKET *pkt);
 117 __owur int tls_process_cert_status_body(SSL *s, PACKET *pkt);
 118 __owur MSG_PROCESS_RETURN tls_process_cert_status(SSL *s, PACKET *pkt);
 119 __owur MSG_PROCESS_RETURN tls_process_server_done(SSL *s, PACKET *pkt);
 120 __owur int tls_construct_cert_verify(SSL *s, WPACKET *pkt);
 121 __owur WORK_STATE tls_prepare_client_certificate(SSL *s, WORK_STATE wst);
 122 __owur int tls_construct_client_certificate(SSL *s, WPACKET *pkt);
 123 __owur int ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey);
 124 __owur int tls_construct_client_key_exchange(SSL *s, WPACKET *pkt);
 125 __owur int tls_client_key_exchange_post_work(SSL *s);
 126 __owur int tls_construct_cert_status_body(SSL *s, WPACKET *pkt);
 127 __owur int tls_construct_cert_status(SSL *s, WPACKET *pkt);
 128 __owur MSG_PROCESS_RETURN tls_process_key_exchange(SSL *s, PACKET *pkt);
 129 __owur MSG_PROCESS_RETURN tls_process_server_certificate(SSL *s, PACKET *pkt);
 130 __owur int ssl3_check_cert_and_algorithm(SSL *s);
 131 #ifndef OPENSSL_NO_NEXTPROTONEG
 132 __owur int tls_construct_next_proto(SSL *s, WPACKET *pkt);
 133 #endif
 134 __owur MSG_PROCESS_RETURN tls_process_hello_req(SSL *s, PACKET *pkt);
 135 __owur MSG_PROCESS_RETURN dtls_process_hello_verify(SSL *s, PACKET *pkt);
 136 __owur int tls_construct_end_of_early_data(SSL *s, WPACKET *pkt);
 137
 138 /* some server-only functions */
 139 __owur MSG_PROCESS_RETURN tls_process_client_hello(SSL *s, PACKET *pkt);
 140 __owur WORK_STATE tls_post_process_client_hello(SSL *s, WORK_STATE wst);
 141 __owur int tls_construct_server_hello(SSL *s, WPACKET *pkt);
 142 __owur int dtls_construct_hello_verify_request(SSL *s, WPACKET *pkt);
 143 __owur int tls_construct_server_certificate(SSL *s, WPACKET *pkt);
 144 __owur int tls_construct_server_key_exchange(SSL *s, WPACKET *pkt);
 145 __owur int tls_construct_certificate_request(SSL *s, WPACKET *pkt);
 146 __owur int tls_construct_server_done(SSL *s, WPACKET *pkt);
 147 __owur MSG_PROCESS_RETURN tls_process_client_certificate(SSL *s, PACKET *pkt);
 148 __owur MSG_PROCESS_RETURN tls_process_client_key_exchange(SSL *s, PACKET *pkt);
 149 __owur WORK_STATE tls_post_process_client_key_exchange(SSL *s, WORK_STATE wst);
 150 __owur MSG_PROCESS_RETURN tls_process_cert_verify(SSL *s, PACKET *pkt);
 151 #ifndef OPENSSL_NO_NEXTPROTONEG
 152 __owur MSG_PROCESS_RETURN tls_process_next_proto(SSL *s, PACKET *pkt);
 153 #endif
 154 __owur int tls_construct_new_session_ticket(SSL *s, WPACKET *pkt);
 155 MSG_PROCESS_RETURN tls_process_end_of_early_data(SSL *s, PACKET *pkt);
 156
 157
 158 /* Extension processing */
 159
 160 typedef enum ext_return_en {
 161     EXT_RETURN_FAIL,
 162     EXT_RETURN_SENT,
 163     EXT_RETURN_NOT_SENT
 164 } EXT_RETURN;
 165
 166 __owur int tls_validate_all_contexts(SSL *s, unsigned int thisctx,
 167                                      RAW_EXTENSION *exts);
 168 __owur int extension_is_relevant(SSL *s, unsigned int extctx,
 169                                  unsigned int thisctx);
 170 __owur int tls_collect_extensions(SSL *s, PACKET *packet, unsigned int context,
 171                                   RAW_EXTENSION **res, size_t *len, int init);
 172 __owur int tls_parse_extension(SSL *s, TLSEXT_INDEX idx, int context,
 173                                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 fin);
 176 __owur int should_add_extension(SSL *s, unsigned int extctx,
 177                                 unsigned int thisctx, int max_version);
 178 __owur int tls_construct_extensions(SSL *s, WPACKET *pkt, unsigned int context,
 179                                     X509 *x, size_t chainidx);
 180
 181 __owur int tls_psk_do_binder(SSL *s, const EVP_MD *md,
 182                              const unsigned char *msgstart,
 183                              size_t binderoffset, const unsigned char *binderin,
 184                              unsigned char *binderout,
 185                              SSL_SESSION *sess, int sign, int external);
 186
 187 /* Server Extension processing */
 188 int tls_parse_ctos_renegotiate(SSL *s, PACKET *pkt, unsigned int context,
 189                                X509 *x, size_t chainidx);
 190 int tls_parse_ctos_server_name(SSL *s, PACKET *pkt, unsigned int context,
 191                                X509 *x, size_t chainidx);
 192 int tls_parse_ctos_maxfragmentlen(SSL *s, PACKET *pkt, unsigned int context,
 193                                   X509 *x, size_t chainidx);
 194 #ifndef OPENSSL_NO_SRP
 195 int tls_parse_ctos_srp(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
 196                        size_t chainidx);
 197 #endif
 198 int tls_parse_ctos_early_data(SSL *s, PACKET *pkt, unsigned int context,
 199                               X509 *x, size_t chainidx);
 200 #ifndef OPENSSL_NO_EC
 201 int tls_parse_ctos_ec_pt_formats(SSL *s, PACKET *pkt, unsigned int context,
 202                                  X509 *x, size_t chainidx);
 203 int tls_parse_ctos_supported_groups(SSL *s, PACKET *pkt, unsigned int context,
 204                                     X509 *x, size_t chainidxl);
 205 #endif
 206 int tls_parse_ctos_session_ticket(SSL *s, PACKET *pkt, unsigned int context,
 207                                   X509 *x, size_t chainidx);
 208 int tls_parse_ctos_sig_algs(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
 209                             size_t chainidx);
 210 #ifndef OPENSSL_NO_OCSP
 211 int tls_parse_ctos_status_request(SSL *s, PACKET *pkt, unsigned int context,
 212                                   X509 *x, size_t chainidx);
 213 #endif
 214 #ifndef OPENSSL_NO_NEXTPROTONEG
 215 int tls_parse_ctos_npn(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
 216                        size_t chainidx);
 217 #endif
 218 int tls_parse_ctos_alpn(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
 219                         size_t chainidx);
 220 #ifndef OPENSSL_NO_SRTP
 221 int tls_parse_ctos_use_srtp(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
 222                             size_t chainidx);
 223 #endif
 224 int tls_parse_ctos_etm(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
 225                        size_t chainidx);
 226 int tls_parse_ctos_key_share(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
 227                              size_t chainidx);
 228 int tls_parse_ctos_ems(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
 229                        size_t chainidx);
 230 int tls_parse_ctos_psk_kex_modes(SSL *s, PACKET *pkt, unsigned int context,
 231                                  X509 *x, size_t chainidx);
 232 int tls_parse_ctos_psk(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
 233                        size_t chainidx);
 234
 235 EXT_RETURN tls_construct_stoc_renegotiate(SSL *s, WPACKET *pkt,
 236                                           unsigned int context, X509 *x,
 237                                           size_t chainidx);
 238 EXT_RETURN tls_construct_stoc_server_name(SSL *s, WPACKET *pkt,
 239                                           unsigned int context, X509 *x,
 240                                           size_t chainidx);
 241 EXT_RETURN tls_construct_stoc_early_data(SSL *s, WPACKET *pkt,
 242                                          unsigned int context, X509 *x,
 243                                          size_t chainidx);
 244 EXT_RETURN tls_construct_stoc_maxfragmentlen(SSL *s, WPACKET *pkt,
 245                                              unsigned int context, X509 *x,
 246                                              size_t chainidx);
 247 #ifndef OPENSSL_NO_EC
 248 EXT_RETURN tls_construct_stoc_ec_pt_formats(SSL *s, WPACKET *pkt,
 249                                             unsigned int context, X509 *x,
 250                                             size_t chainidx);
 251 #endif
 252 EXT_RETURN tls_construct_stoc_supported_groups(SSL *s, WPACKET *pkt,
 253                                                unsigned int context, X509 *x,
 254                                                size_t chainidx);
 255 EXT_RETURN tls_construct_stoc_session_ticket(SSL *s, WPACKET *pkt,
 256                                              unsigned int context, X509 *x,
 257                                              size_t chainidx);
 258 #ifndef OPENSSL_NO_OCSP
 259 EXT_RETURN tls_construct_stoc_status_request(SSL *s, WPACKET *pkt,
 260                                              unsigned int context, X509 *x,
 261                                              size_t chainidx);
 262 #endif
 263 #ifndef OPENSSL_NO_NEXTPROTONEG
 264 EXT_RETURN tls_construct_stoc_next_proto_neg(SSL *s, WPACKET *pkt,
 265                                              unsigned int context, X509 *x,
 266                                              size_t chainidx);
 267 #endif
 268 EXT_RETURN tls_construct_stoc_alpn(SSL *s, WPACKET *pkt, unsigned int context,
 269                                    X509 *x, size_t chainidx);
 270 #ifndef OPENSSL_NO_SRTP
 271 EXT_RETURN tls_construct_stoc_use_srtp(SSL *s, WPACKET *pkt, unsigned int context,
 272                                 X509 *x, size_t chainidx);
 273 #endif
 274 EXT_RETURN tls_construct_stoc_etm(SSL *s, WPACKET *pkt, unsigned int context,
 275                                   X509 *x, size_t chainidx);
 276 EXT_RETURN tls_construct_stoc_ems(SSL *s, WPACKET *pkt, unsigned int context,
 277                                   X509 *x, size_t chainidx);
 278 EXT_RETURN tls_construct_stoc_supported_versions(SSL *s, WPACKET *pkt,
 279                                                  unsigned int context, X509 *x,
 280                                                  size_t chainidx);
 281 EXT_RETURN tls_construct_stoc_key_share(SSL *s, WPACKET *pkt,
 282                                         unsigned int context, X509 *x,
 283                                         size_t chainidx);
 284 /*
 285  * Not in public headers as this is not an official extension. Only used when
 286  * SSL_OP_CRYPTOPRO_TLSEXT_BUG is set.
 287  */
 288 #define TLSEXT_TYPE_cryptopro_bug      0xfde8
 289 EXT_RETURN tls_construct_stoc_cryptopro_bug(SSL *s, WPACKET *pkt,
 290                                             unsigned int context, X509 *x,
 291                                             size_t chainidx);
 292 EXT_RETURN tls_construct_stoc_psk(SSL *s, WPACKET *pkt, unsigned int context,
 293                                   X509 *x, size_t chainidx);
 294
 295 /* Client Extension processing */
 296 EXT_RETURN tls_construct_ctos_renegotiate(SSL *s, WPACKET *pkt, unsigned int context,
 297                                    X509 *x, size_t chainidx);
 298 EXT_RETURN tls_construct_ctos_server_name(SSL *s, WPACKET *pkt, unsigned int context,
 299                                    X509 *x, size_t chainidx);
 300 EXT_RETURN tls_construct_ctos_maxfragmentlen(SSL *s, WPACKET *pkt, unsigned int context,
 301                                              X509 *x, size_t chainidx);
 302 #ifndef OPENSSL_NO_SRP
 303 EXT_RETURN tls_construct_ctos_srp(SSL *s, WPACKET *pkt, unsigned int context, X509 *x,
 304                            size_t chainidx);
 305 #endif
 306 #ifndef OPENSSL_NO_EC
 307 EXT_RETURN tls_construct_ctos_ec_pt_formats(SSL *s, WPACKET *pkt,
 308                                             unsigned int context, X509 *x,
 309                                             size_t chainidx);
 310 EXT_RETURN tls_construct_ctos_supported_groups(SSL *s, WPACKET *pkt,
 311                                                unsigned int context, X509 *x,
 312                                                size_t chainidx);
 313 #endif
 314 EXT_RETURN tls_construct_ctos_early_data(SSL *s, WPACKET *pkt,
 315                                          unsigned int context, X509 *x,
 316                                          size_t chainidx);
 317 EXT_RETURN tls_construct_ctos_session_ticket(SSL *s, WPACKET *pkt,
 318                                              unsigned int context, X509 *x,
 319                                              size_t chainidx);
 320 EXT_RETURN tls_construct_ctos_sig_algs(SSL *s, WPACKET *pkt,
 321                                        unsigned int context, X509 *x,
 322                                        size_t chainidx);
 323 #ifndef OPENSSL_NO_OCSP
 324 EXT_RETURN tls_construct_ctos_status_request(SSL *s, WPACKET *pkt,
 325                                              unsigned int context, X509 *x,
 326                                              size_t chainidx);
 327 #endif
 328 #ifndef OPENSSL_NO_NEXTPROTONEG
 329 EXT_RETURN tls_construct_ctos_npn(SSL *s, WPACKET *pkt, unsigned int context,
 330                                   X509 *x, size_t chainidx);
 331 #endif
 332 EXT_RETURN tls_construct_ctos_alpn(SSL *s, WPACKET *pkt, unsigned int context,
 333                                    X509 *x, size_t chainidx);
 334 #ifndef OPENSSL_NO_SRTP
 335 EXT_RETURN tls_construct_ctos_use_srtp(SSL *s, WPACKET *pkt, unsigned int context,
 336                                        X509 *x, size_t chainidx);
 337 #endif
 338 EXT_RETURN tls_construct_ctos_etm(SSL *s, WPACKET *pkt, unsigned int context,
 339                                   X509 *x, size_t chainidx);
 340 #ifndef OPENSSL_NO_CT
 341 EXT_RETURN tls_construct_ctos_sct(SSL *s, WPACKET *pkt, unsigned int context,
 342                                   X509 *x, size_t chainidx);
 343 #endif
 344 EXT_RETURN tls_construct_ctos_ems(SSL *s, WPACKET *pkt, unsigned int context,
 345                                   X509 *x, size_t chainidx);
 346 EXT_RETURN tls_construct_ctos_supported_versions(SSL *s, WPACKET *pkt,
 347                                                  unsigned int context, X509 *x,
 348                                                  size_t chainidx);
 349 EXT_RETURN tls_construct_ctos_key_share(SSL *s, WPACKET *pkt,
 350                                         unsigned int context, X509 *x,
 351                                         size_t chainidx);
 352 EXT_RETURN tls_construct_ctos_psk_kex_modes(SSL *s, WPACKET *pkt,
 353                                             unsigned int context, X509 *x,
 354                                             size_t chainidx);
 355 EXT_RETURN tls_construct_ctos_cookie(SSL *s, WPACKET *pkt, unsigned int context,
 356                                      X509 *x, size_t chainidx);
 357 EXT_RETURN tls_construct_ctos_padding(SSL *s, WPACKET *pkt,
 358                                       unsigned int context, X509 *x,
 359                                       size_t chainidx);
 360 EXT_RETURN tls_construct_ctos_psk(SSL *s, WPACKET *pkt, unsigned int context,
 361                                   X509 *x, size_t chainidx);
 362 int tls_parse_stoc_renegotiate(SSL *s, PACKET *pkt, unsigned int context,
 363                                X509 *x, size_t chainidx);
 364 int tls_parse_stoc_server_name(SSL *s, PACKET *pkt, unsigned int context,
 365                                X509 *x, size_t chainidx);
 366 int tls_parse_stoc_early_data(SSL *s, PACKET *pkt, unsigned int context,
 367                               X509 *x, size_t chainidx);
 368 int tls_parse_stoc_maxfragmentlen(SSL *s, PACKET *pkt, unsigned int context,
 369                                   X509 *x, size_t chainidx);
 370 #ifndef OPENSSL_NO_EC
 371 int tls_parse_stoc_ec_pt_formats(SSL *s, PACKET *pkt, unsigned int context,
 372                                  X509 *x, size_t chainidx);
 373 #endif
 374 int tls_parse_stoc_session_ticket(SSL *s, PACKET *pkt, unsigned int context,
 375                                   X509 *x, size_t chainidx);
 376 #ifndef OPENSSL_NO_OCSP
 377 int tls_parse_stoc_status_request(SSL *s, PACKET *pkt, unsigned int context,
 378                                   X509 *x, size_t chainidx);
 379 #endif
 380 #ifndef OPENSSL_NO_CT
 381 int tls_parse_stoc_sct(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
 382                        size_t chainidx);
 383 #endif
 384 #ifndef OPENSSL_NO_NEXTPROTONEG
 385 int tls_parse_stoc_npn(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
 386                        size_t chainidx);
 387 #endif
 388 int tls_parse_stoc_alpn(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
 389                         size_t chainidx);
 390 #ifndef OPENSSL_NO_SRTP
 391 int tls_parse_stoc_use_srtp(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
 392                             size_t chainidx);
 393 #endif
 394 int tls_parse_stoc_etm(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
 395                        size_t chainidx);
 396 int tls_parse_stoc_ems(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
 397                        size_t chainidx);
 398 int tls_parse_stoc_supported_versions(SSL *s, PACKET *pkt, unsigned int context,
 399                                       X509 *x, size_t chainidx);
 400 int tls_parse_stoc_key_share(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
 401                              size_t chainidx);
 402 int tls_parse_stoc_cookie(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
 403                        size_t chainidx);
 404 int tls_parse_stoc_psk(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
 405                        size_t chainidx);
 406
 407 int tls_handle_alpn(SSL *s);