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 typedef int (*confunc_f) (SSL *s, WPACKET *pkt);
  56
  57 int check_in_list(SSL *s, uint16_t group_id, const uint16_t *groups,
  58                   size_t num_groups, int checkallow);
  59 int create_synthetic_message_hash(SSL *s, const unsigned char *hashval,
  60                                   size_t hashlen, const unsigned char *hrr,
  61                                   size_t hrrlen);
  62 int parse_ca_names(SSL *s, PACKET *pkt);
  63 int construct_ca_names(SSL *s, WPACKET *pkt);
  64 size_t construct_key_exchange_tbs(SSL *s, unsigned char **ptbs,
  65                                   const void *param, size_t paramlen);
  66
  67 /*
  68  * TLS/DTLS client state machine functions
  69  */
  70 int ossl_statem_client_read_transition(SSL *s, int mt);
  71 WRITE_TRAN ossl_statem_client_write_transition(SSL *s);
  72 WORK_STATE ossl_statem_client_pre_work(SSL *s, WORK_STATE wst);
  73 WORK_STATE ossl_statem_client_post_work(SSL *s, WORK_STATE wst);
  74 int ossl_statem_client_construct_message(SSL *s, WPACKET *pkt,
  75                                          confunc_f *confunc, int *mt);
  76 size_t ossl_statem_client_max_message_size(SSL *s);
  77 MSG_PROCESS_RETURN ossl_statem_client_process_message(SSL *s, PACKET *pkt);
  78 WORK_STATE ossl_statem_client_post_process_message(SSL *s, WORK_STATE wst);
  79
  80 /*
  81  * TLS/DTLS server state machine functions
  82  */
  83 int ossl_statem_server_read_transition(SSL *s, int mt);
  84 WRITE_TRAN ossl_statem_server_write_transition(SSL *s);
  85 WORK_STATE ossl_statem_server_pre_work(SSL *s, WORK_STATE wst);
  86 WORK_STATE ossl_statem_server_post_work(SSL *s, WORK_STATE wst);
  87 int ossl_statem_server_construct_message(SSL *s, WPACKET *pkt,
  88                                          confunc_f *confunc,int *mt);
  89 size_t ossl_statem_server_max_message_size(SSL *s);
  90 MSG_PROCESS_RETURN ossl_statem_server_process_message(SSL *s, PACKET *pkt);
  91 WORK_STATE ossl_statem_server_post_process_message(SSL *s, WORK_STATE wst);
  92
  93 /* Functions for getting new message data */
  94 __owur int tls_get_message_header(SSL *s, int *mt);
  95 __owur int tls_get_message_body(SSL *s, size_t *len);
  96 __owur int dtls_get_message(SSL *s, int *mt, size_t *len);
  97
  98 /* Message construction and processing functions */
  99 __owur int tls_process_initial_server_flight(SSL *s);
 100 __owur MSG_PROCESS_RETURN tls_process_change_cipher_spec(SSL *s, PACKET *pkt);
 101 __owur MSG_PROCESS_RETURN tls_process_finished(SSL *s, PACKET *pkt);
 102 __owur int tls_construct_change_cipher_spec(SSL *s, WPACKET *pkt);
 103 __owur int dtls_construct_change_cipher_spec(SSL *s, WPACKET *pkt);
 104
 105 __owur int tls_construct_finished(SSL *s, WPACKET *pkt);
 106 __owur int tls_construct_key_update(SSL *s, WPACKET *pkt);
 107 __owur MSG_PROCESS_RETURN tls_process_key_update(SSL *s, PACKET *pkt);
 108 __owur WORK_STATE tls_finish_handshake(SSL *s, WORK_STATE wst, int clearbufs,
 109                                        int stop);
 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_cert(SSL *s, PACKET *pkt, unsigned int context,
 209                                  X509 *x, size_t chainidx);
 210 int tls_parse_ctos_sig_algs(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
 211                             size_t chainidx);
 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);
 215 #endif
 216 #ifndef OPENSSL_NO_NEXTPROTONEG
 217 int tls_parse_ctos_npn(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
 218                        size_t chainidx);
 219 #endif
 220 int tls_parse_ctos_alpn(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
 221                         size_t chainidx);
 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);
 225 #endif
 226 int tls_parse_ctos_etm(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
 227                        size_t chainidx);
 228 int tls_parse_ctos_key_share(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
 229                              size_t chainidx);
 230 int tls_parse_ctos_cookie(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
 231                           size_t chainidx);
 232 int tls_parse_ctos_ems(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
 233                        size_t chainidx);
 234 int tls_parse_ctos_psk_kex_modes(SSL *s, PACKET *pkt, unsigned int context,
 235                                  X509 *x, size_t chainidx);
 236 int tls_parse_ctos_psk(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
 237                        size_t chainidx);
 238
 239 EXT_RETURN tls_construct_stoc_renegotiate(SSL *s, WPACKET *pkt,
 240                                           unsigned int context, X509 *x,
 241                                           size_t chainidx);
 242 EXT_RETURN tls_construct_stoc_server_name(SSL *s, WPACKET *pkt,
 243                                           unsigned int context, X509 *x,
 244                                           size_t chainidx);
 245 EXT_RETURN tls_construct_stoc_early_data(SSL *s, WPACKET *pkt,
 246                                          unsigned int context, X509 *x,
 247                                          size_t chainidx);
 248 EXT_RETURN tls_construct_stoc_maxfragmentlen(SSL *s, WPACKET *pkt,
 249                                              unsigned int context, X509 *x,
 250                                              size_t chainidx);
 251 #ifndef OPENSSL_NO_EC
 252 EXT_RETURN tls_construct_stoc_ec_pt_formats(SSL *s, WPACKET *pkt,
 253                                             unsigned int context, X509 *x,
 254                                             size_t chainidx);
 255 #endif
 256 EXT_RETURN tls_construct_stoc_supported_groups(SSL *s, WPACKET *pkt,
 257                                                unsigned int context, X509 *x,
 258                                                size_t chainidx);
 259 EXT_RETURN tls_construct_stoc_session_ticket(SSL *s, WPACKET *pkt,
 260                                              unsigned int context, X509 *x,
 261                                              size_t chainidx);
 262 #ifndef OPENSSL_NO_OCSP
 263 EXT_RETURN tls_construct_stoc_status_request(SSL *s, WPACKET *pkt,
 264                                              unsigned int context, X509 *x,
 265                                              size_t chainidx);
 266 #endif
 267 #ifndef OPENSSL_NO_NEXTPROTONEG
 268 EXT_RETURN tls_construct_stoc_next_proto_neg(SSL *s, WPACKET *pkt,
 269                                              unsigned int context, X509 *x,
 270                                              size_t chainidx);
 271 #endif
 272 EXT_RETURN tls_construct_stoc_alpn(SSL *s, WPACKET *pkt, unsigned int context,
 273                                    X509 *x, size_t chainidx);
 274 #ifndef OPENSSL_NO_SRTP
 275 EXT_RETURN tls_construct_stoc_use_srtp(SSL *s, WPACKET *pkt, unsigned int context,
 276                                 X509 *x, size_t chainidx);
 277 #endif
 278 EXT_RETURN tls_construct_stoc_etm(SSL *s, WPACKET *pkt, unsigned int context,
 279                                   X509 *x, size_t chainidx);
 280 EXT_RETURN tls_construct_stoc_ems(SSL *s, WPACKET *pkt, unsigned int context,
 281                                   X509 *x, size_t chainidx);
 282 EXT_RETURN tls_construct_stoc_supported_versions(SSL *s, WPACKET *pkt,
 283                                                  unsigned int context, X509 *x,
 284                                                  size_t chainidx);
 285 EXT_RETURN tls_construct_stoc_key_share(SSL *s, WPACKET *pkt,
 286                                         unsigned int context, X509 *x,
 287                                         size_t chainidx);
 288 EXT_RETURN tls_construct_stoc_cookie(SSL *s, WPACKET *pkt, unsigned int context,
 289                                      X509 *x, size_t chainidx);
 290 /*
 291  * Not in public headers as this is not an official extension. Only used when
 292  * SSL_OP_CRYPTOPRO_TLSEXT_BUG is set.
 293  */
 294 #define TLSEXT_TYPE_cryptopro_bug      0xfde8
 295 EXT_RETURN tls_construct_stoc_cryptopro_bug(SSL *s, WPACKET *pkt,
 296                                             unsigned int context, X509 *x,
 297                                             size_t chainidx);
 298 EXT_RETURN tls_construct_stoc_psk(SSL *s, WPACKET *pkt, unsigned int context,
 299                                   X509 *x, size_t chainidx);
 300
 301 /* Client Extension processing */
 302 EXT_RETURN tls_construct_ctos_renegotiate(SSL *s, WPACKET *pkt, unsigned int context,
 303                                    X509 *x, size_t chainidx);
 304 EXT_RETURN tls_construct_ctos_server_name(SSL *s, WPACKET *pkt, unsigned int context,
 305                                    X509 *x, size_t chainidx);
 306 EXT_RETURN tls_construct_ctos_maxfragmentlen(SSL *s, WPACKET *pkt, unsigned int context,
 307                                              X509 *x, size_t chainidx);
 308 #ifndef OPENSSL_NO_SRP
 309 EXT_RETURN tls_construct_ctos_srp(SSL *s, WPACKET *pkt, unsigned int context, X509 *x,
 310                            size_t chainidx);
 311 #endif
 312 #ifndef OPENSSL_NO_EC
 313 EXT_RETURN tls_construct_ctos_ec_pt_formats(SSL *s, WPACKET *pkt,
 314                                             unsigned int context, X509 *x,
 315                                             size_t chainidx);
 316 EXT_RETURN tls_construct_ctos_supported_groups(SSL *s, WPACKET *pkt,
 317                                                unsigned int context, X509 *x,
 318                                                size_t chainidx);
 319 #endif
 320 EXT_RETURN tls_construct_ctos_early_data(SSL *s, WPACKET *pkt,
 321                                          unsigned int context, X509 *x,
 322                                          size_t chainidx);
 323 EXT_RETURN tls_construct_ctos_session_ticket(SSL *s, WPACKET *pkt,
 324                                              unsigned int context, X509 *x,
 325                                              size_t chainidx);
 326 EXT_RETURN tls_construct_ctos_sig_algs(SSL *s, WPACKET *pkt,
 327                                        unsigned int context, X509 *x,
 328                                        size_t chainidx);
 329 #ifndef OPENSSL_NO_OCSP
 330 EXT_RETURN tls_construct_ctos_status_request(SSL *s, WPACKET *pkt,
 331                                              unsigned int context, X509 *x,
 332                                              size_t chainidx);
 333 #endif
 334 #ifndef OPENSSL_NO_NEXTPROTONEG
 335 EXT_RETURN tls_construct_ctos_npn(SSL *s, WPACKET *pkt, unsigned int context,
 336                                   X509 *x, size_t chainidx);
 337 #endif
 338 EXT_RETURN tls_construct_ctos_alpn(SSL *s, WPACKET *pkt, unsigned int context,
 339                                    X509 *x, size_t chainidx);
 340 #ifndef OPENSSL_NO_SRTP
 341 EXT_RETURN tls_construct_ctos_use_srtp(SSL *s, WPACKET *pkt, unsigned int context,
 342                                        X509 *x, size_t chainidx);
 343 #endif
 344 EXT_RETURN tls_construct_ctos_etm(SSL *s, WPACKET *pkt, unsigned int context,
 345                                   X509 *x, size_t chainidx);
 346 #ifndef OPENSSL_NO_CT
 347 EXT_RETURN tls_construct_ctos_sct(SSL *s, WPACKET *pkt, unsigned int context,
 348                                   X509 *x, size_t chainidx);
 349 #endif
 350 EXT_RETURN tls_construct_ctos_ems(SSL *s, WPACKET *pkt, unsigned int context,
 351                                   X509 *x, size_t chainidx);
 352 EXT_RETURN tls_construct_ctos_supported_versions(SSL *s, WPACKET *pkt,
 353                                                  unsigned int context, X509 *x,
 354                                                  size_t chainidx);
 355 EXT_RETURN tls_construct_ctos_key_share(SSL *s, WPACKET *pkt,
 356                                         unsigned int context, X509 *x,
 357                                         size_t chainidx);
 358 EXT_RETURN tls_construct_ctos_psk_kex_modes(SSL *s, WPACKET *pkt,
 359                                             unsigned int context, X509 *x,
 360                                             size_t chainidx);
 361 EXT_RETURN tls_construct_ctos_cookie(SSL *s, WPACKET *pkt, unsigned int context,
 362                                      X509 *x, size_t chainidx);
 363 EXT_RETURN tls_construct_ctos_padding(SSL *s, WPACKET *pkt,
 364                                       unsigned int context, X509 *x,
 365                                       size_t chainidx);
 366 EXT_RETURN tls_construct_ctos_psk(SSL *s, WPACKET *pkt, unsigned int context,
 367                                   X509 *x, size_t chainidx);
 368 int tls_parse_stoc_renegotiate(SSL *s, PACKET *pkt, unsigned int context,
 369                                X509 *x, size_t chainidx);
 370 int tls_parse_stoc_server_name(SSL *s, PACKET *pkt, unsigned int context,
 371                                X509 *x, size_t chainidx);
 372 int tls_parse_stoc_early_data(SSL *s, PACKET *pkt, unsigned int context,
 373                               X509 *x, size_t chainidx);
 374 int tls_parse_stoc_maxfragmentlen(SSL *s, PACKET *pkt, unsigned int context,
 375                                   X509 *x, size_t chainidx);
 376 #ifndef OPENSSL_NO_EC
 377 int tls_parse_stoc_ec_pt_formats(SSL *s, PACKET *pkt, unsigned int context,
 378                                  X509 *x, size_t chainidx);
 379 #endif
 380 int tls_parse_stoc_session_ticket(SSL *s, PACKET *pkt, unsigned int context,
 381                                   X509 *x, size_t chainidx);
 382 #ifndef OPENSSL_NO_OCSP
 383 int tls_parse_stoc_status_request(SSL *s, PACKET *pkt, unsigned int context,
 384                                   X509 *x, size_t chainidx);
 385 #endif
 386 #ifndef OPENSSL_NO_CT
 387 int tls_parse_stoc_sct(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
 388                        size_t chainidx);
 389 #endif
 390 #ifndef OPENSSL_NO_NEXTPROTONEG
 391 int tls_parse_stoc_npn(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
 392                        size_t chainidx);
 393 #endif
 394 int tls_parse_stoc_alpn(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
 395                         size_t chainidx);
 396 #ifndef OPENSSL_NO_SRTP
 397 int tls_parse_stoc_use_srtp(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
 398                             size_t chainidx);
 399 #endif
 400 int tls_parse_stoc_etm(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
 401                        size_t chainidx);
 402 int tls_parse_stoc_ems(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
 403                        size_t chainidx);
 404 int tls_parse_stoc_supported_versions(SSL *s, PACKET *pkt, unsigned int context,
 405                                       X509 *x, size_t chainidx);
 406 int tls_parse_stoc_key_share(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
 407                              size_t chainidx);
 408 int tls_parse_stoc_cookie(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
 409                        size_t chainidx);
 410 int tls_parse_stoc_psk(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
 411                        size_t chainidx);
 412
 413 int tls_handle_alpn(SSL *s);