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 /* Message processing return codes */
  39 typedef enum {
  40     /* Something bad happened */
  41     MSG_PROCESS_ERROR,
  42     /* We've finished reading - swap to writing */
  43     MSG_PROCESS_FINISHED_READING,
  44     /*
  45      * We've completed the main processing of this message but there is some
  46      * post processing to be done.
  47      */
  48     MSG_PROCESS_CONTINUE_PROCESSING,
  49     /* We've finished this message - read the next message */
  50     MSG_PROCESS_CONTINUE_READING
  51 } MSG_PROCESS_RETURN;
  52
  53 /* Flush the write BIO */
  54 int statem_flush(SSL *s);
  55
  56 typedef int (*confunc_f) (SSL *s, WPACKET *pkt);
  57
  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);
  61 int parse_ca_names(SSL *s, PACKET *pkt, int *al);
  62 int construct_ca_names(SSL *s, WPACKET *pkt);
  63 size_t construct_key_exchange_tbs(const SSL *s, unsigned char **ptbs,
  64                                   const void *param, size_t paramlen);
  65
  66 /*
  67  * TLS/DTLS client state machine functions
  68  */
  69 int ossl_statem_client_read_transition(SSL *s, int mt);
  70 WRITE_TRAN ossl_statem_client_write_transition(SSL *s);
  71 WORK_STATE ossl_statem_client_pre_work(SSL *s, WORK_STATE wst);
  72 WORK_STATE ossl_statem_client_post_work(SSL *s, WORK_STATE wst);
  73 int ossl_statem_client_construct_message(SSL *s, WPACKET *pkt,
  74                                          confunc_f *confunc, int *mt);
  75 size_t ossl_statem_client_max_message_size(SSL *s);
  76 MSG_PROCESS_RETURN ossl_statem_client_process_message(SSL *s, PACKET *pkt);
  77 WORK_STATE ossl_statem_client_post_process_message(SSL *s, WORK_STATE wst);
  78
  79 /*
  80  * TLS/DTLS server state machine functions
  81  */
  82 int ossl_statem_server_read_transition(SSL *s, int mt);
  83 WRITE_TRAN ossl_statem_server_write_transition(SSL *s);
  84 WORK_STATE ossl_statem_server_pre_work(SSL *s, WORK_STATE wst);
  85 WORK_STATE ossl_statem_server_post_work(SSL *s, WORK_STATE wst);
  86 int ossl_statem_server_construct_message(SSL *s, WPACKET *pkt,
  87                                          confunc_f *confunc,int *mt);
  88 size_t ossl_statem_server_max_message_size(SSL *s);
  89 MSG_PROCESS_RETURN ossl_statem_server_process_message(SSL *s, PACKET *pkt);
  90 WORK_STATE ossl_statem_server_post_process_message(SSL *s, WORK_STATE wst);
  91
  92 /* Functions for getting new message data */
  93 __owur int tls_get_message_header(SSL *s, int *mt);
  94 __owur int tls_get_message_body(SSL *s, size_t *len);
  95 __owur int dtls_get_message(SSL *s, int *mt, size_t *len);
  96
  97 /* Message construction and processing functions */
  98 __owur int tls_process_initial_server_flight(SSL *s, int *al);
  99 __owur MSG_PROCESS_RETURN tls_process_change_cipher_spec(SSL *s, PACKET *pkt);
 100 __owur MSG_PROCESS_RETURN tls_process_finished(SSL *s, PACKET *pkt);
 101 __owur int tls_construct_change_cipher_spec(SSL *s, WPACKET *pkt);
 102 __owur int dtls_construct_change_cipher_spec(SSL *s, WPACKET *pkt);
 103
 104 __owur int tls_construct_finished(SSL *s, WPACKET *pkt);
 105 __owur int tls_construct_key_update(SSL *s, WPACKET *pkt);
 106 __owur MSG_PROCESS_RETURN tls_process_key_update(SSL *s, PACKET *pkt);
 107 __owur WORK_STATE tls_finish_handshake(SSL *s, WORK_STATE wst, int clearbufs);
 108 __owur WORK_STATE dtls_wait_for_dry(SSL *s);
 109
 110 /* some client-only functions */
 111 __owur int tls_construct_client_hello(SSL *s, WPACKET *pkt);
 112 __owur MSG_PROCESS_RETURN tls_process_server_hello(SSL *s, PACKET *pkt);
 113 __owur MSG_PROCESS_RETURN tls_process_certificate_request(SSL *s, PACKET *pkt);
 114 __owur MSG_PROCESS_RETURN tls_process_new_session_ticket(SSL *s, PACKET *pkt);
 115 __owur int tls_process_cert_status_body(SSL *s, PACKET *pkt, int *al);
 116 __owur MSG_PROCESS_RETURN tls_process_cert_status(SSL *s, PACKET *pkt);
 117 __owur MSG_PROCESS_RETURN tls_process_server_done(SSL *s, PACKET *pkt);
 118 __owur int tls_construct_cert_verify(SSL *s, WPACKET *pkt);
 119 __owur WORK_STATE tls_prepare_client_certificate(SSL *s, WORK_STATE wst);
 120 __owur int tls_construct_client_certificate(SSL *s, WPACKET *pkt);
 121 __owur int ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey);
 122 __owur int tls_construct_client_key_exchange(SSL *s, WPACKET *pkt);
 123 __owur int tls_client_key_exchange_post_work(SSL *s);
 124 __owur int tls_construct_cert_status_body(SSL *s, WPACKET *pkt);
 125 __owur int tls_construct_cert_status(SSL *s, WPACKET *pkt);
 126 __owur MSG_PROCESS_RETURN tls_process_key_exchange(SSL *s, PACKET *pkt);
 127 __owur MSG_PROCESS_RETURN tls_process_server_certificate(SSL *s, PACKET *pkt);
 128 __owur int ssl3_check_cert_and_algorithm(SSL *s);
 129 #ifndef OPENSSL_NO_NEXTPROTONEG
 130 __owur int tls_construct_next_proto(SSL *s, WPACKET *pkt);
 131 #endif
 132 __owur MSG_PROCESS_RETURN tls_process_hello_req(SSL *s, PACKET *pkt);
 133 __owur MSG_PROCESS_RETURN dtls_process_hello_verify(SSL *s, PACKET *pkt);
 134 __owur int tls_construct_end_of_early_data(SSL *s, WPACKET *pkt);
 135
 136 /* some server-only functions */
 137 __owur MSG_PROCESS_RETURN tls_process_client_hello(SSL *s, PACKET *pkt);
 138 __owur WORK_STATE tls_post_process_client_hello(SSL *s, WORK_STATE wst);
 139 __owur int tls_construct_server_hello(SSL *s, WPACKET *pkt);
 140 __owur int dtls_construct_hello_verify_request(SSL *s, WPACKET *pkt);
 141 __owur int tls_construct_server_certificate(SSL *s, WPACKET *pkt);
 142 __owur int tls_construct_server_key_exchange(SSL *s, WPACKET *pkt);
 143 __owur int tls_construct_certificate_request(SSL *s, WPACKET *pkt);
 144 __owur int tls_construct_server_done(SSL *s, WPACKET *pkt);
 145 __owur MSG_PROCESS_RETURN tls_process_client_certificate(SSL *s, PACKET *pkt);
 146 __owur MSG_PROCESS_RETURN tls_process_client_key_exchange(SSL *s, PACKET *pkt);
 147 __owur WORK_STATE tls_post_process_client_key_exchange(SSL *s, WORK_STATE wst);
 148 __owur MSG_PROCESS_RETURN tls_process_cert_verify(SSL *s, PACKET *pkt);
 149 #ifndef OPENSSL_NO_NEXTPROTONEG
 150 __owur MSG_PROCESS_RETURN tls_process_next_proto(SSL *s, PACKET *pkt);
 151 #endif
 152 __owur int tls_construct_new_session_ticket(SSL *s, WPACKET *pkt);
 153 MSG_PROCESS_RETURN tls_process_end_of_early_data(SSL *s, PACKET *pkt);
 154
 155
 156 /* Extension processing */
 157
 158 typedef enum ext_return_en {
 159     EXT_RETURN_FAIL,
 160     EXT_RETURN_SENT,
 161     EXT_RETURN_NOT_SENT
 162 } EXT_RETURN;
 163
 164 __owur int extension_is_relevant(SSL *s, unsigned int extctx,
 165                                  unsigned int thisctx);
 166 __owur int tls_collect_extensions(SSL *s, PACKET *packet, unsigned int context,
 167                                   RAW_EXTENSION **res, int *al, size_t *len,
 168                                   int init);
 169 __owur int tls_parse_extension(SSL *s, TLSEXT_INDEX idx, int context,
 170                                RAW_EXTENSION *exts,  X509 *x, size_t chainidx,
 171                                int *al);
 172 __owur int tls_parse_all_extensions(SSL *s, int context, RAW_EXTENSION *exts,
 173                                     X509 *x, size_t chainidx, int *al, int fin);
 174 __owur int should_add_extension(SSL *s, unsigned int extctx,
 175                                 unsigned int thisctx, int max_version);
 176 __owur int tls_construct_extensions(SSL *s, WPACKET *pkt, unsigned int context,
 177                                     X509 *x, size_t chainidx, int *al);
 178
 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, int external);
 184
 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 int tls_parse_ctos_maxfragmentlen(SSL *s, PACKET *pkt, unsigned int context,
 191                                   X509 *x, size_t chainidx, int *al);
 192 #ifndef OPENSSL_NO_SRP
 193 int tls_parse_ctos_srp(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
 194                        size_t chainidx, int *al);
 195 #endif
 196 int tls_parse_ctos_early_data(SSL *s, PACKET *pkt, unsigned int context,
 197                               X509 *x, size_t chainidx, int *al);
 198 #ifndef OPENSSL_NO_EC
 199 int tls_parse_ctos_ec_pt_formats(SSL *s, PACKET *pkt, unsigned int context,
 200                                  X509 *x, size_t chainidx, int *al);
 201 int tls_parse_ctos_supported_groups(SSL *s, PACKET *pkt, unsigned int context,
 202                                     X509 *x, size_t chainidx, int *al);
 203 #endif
 204 int tls_parse_ctos_session_ticket(SSL *s, PACKET *pkt, unsigned int context,
 205                                   X509 *x, size_t chainidx, int *al);
 206 int tls_parse_ctos_sig_algs(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
 207                             size_t chainidx, int *al);
 208 #ifndef OPENSSL_NO_OCSP
 209 int tls_parse_ctos_status_request(SSL *s, PACKET *pkt, unsigned int context,
 210                                   X509 *x, size_t chainidx, int *al);
 211 #endif
 212 #ifndef OPENSSL_NO_NEXTPROTONEG
 213 int tls_parse_ctos_npn(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
 214                        size_t chainidx, int *al);
 215 #endif
 216 int tls_parse_ctos_alpn(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
 217                         size_t chainidx, int *al);
 218 #ifndef OPENSSL_NO_SRTP
 219 int tls_parse_ctos_use_srtp(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
 220                             size_t chainidx, int *al);
 221 #endif
 222 int tls_parse_ctos_etm(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
 223                        size_t chainidx, int *al);
 224 int tls_parse_ctos_key_share(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
 225                              size_t chainidx, int *al);
 226 int tls_parse_ctos_ems(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
 227                        size_t chainidx, int *al);
 228 int tls_parse_ctos_psk_kex_modes(SSL *s, PACKET *pkt, unsigned int context,
 229                                  X509 *x, size_t chainidx, int *al);
 230 int tls_parse_ctos_psk(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
 231                        size_t chainidx, int *al);
 232
 233 EXT_RETURN tls_construct_stoc_renegotiate(SSL *s, WPACKET *pkt,
 234                                           unsigned int context, X509 *x,
 235                                           size_t chainidx, int *al);
 236 EXT_RETURN tls_construct_stoc_server_name(SSL *s, WPACKET *pkt,
 237                                           unsigned int context, X509 *x,
 238                                           size_t chainidx, int *al);
 239 EXT_RETURN tls_construct_stoc_early_data(SSL *s, WPACKET *pkt,
 240                                          unsigned int context, X509 *x,
 241                                          size_t chainidx, int *al);
 242 EXT_RETURN tls_construct_stoc_maxfragmentlen(SSL *s, WPACKET *pkt,
 243                                              unsigned int context, X509 *x,
 244                                              size_t chainidx, int *al);
 245 #ifndef OPENSSL_NO_EC
 246 EXT_RETURN tls_construct_stoc_ec_pt_formats(SSL *s, WPACKET *pkt,
 247                                             unsigned int context, X509 *x,
 248                                             size_t chainidx, int *al);
 249 #endif
 250 EXT_RETURN tls_construct_stoc_supported_groups(SSL *s, WPACKET *pkt,
 251                                                unsigned int context, X509 *x,
 252                                                size_t chainidx, int *al);
 253 EXT_RETURN tls_construct_stoc_session_ticket(SSL *s, WPACKET *pkt,
 254                                              unsigned int context, X509 *x,
 255                                              size_t chainidx, int *al);
 256 #ifndef OPENSSL_NO_OCSP
 257 EXT_RETURN tls_construct_stoc_status_request(SSL *s, WPACKET *pkt,
 258                                              unsigned int context, X509 *x,
 259                                              size_t chainidx, int *al);
 260 #endif
 261 #ifndef OPENSSL_NO_NEXTPROTONEG
 262 EXT_RETURN tls_construct_stoc_next_proto_neg(SSL *s, WPACKET *pkt,
 263                                              unsigned int context, X509 *x,
 264                                              size_t chainidx, int *al);
 265 #endif
 266 EXT_RETURN tls_construct_stoc_alpn(SSL *s, WPACKET *pkt, unsigned int context,
 267                                    X509 *x, size_t chainidx, int *al);
 268 #ifndef OPENSSL_NO_SRTP
 269 EXT_RETURN tls_construct_stoc_use_srtp(SSL *s, WPACKET *pkt, unsigned int context,
 270                                 X509 *x, size_t chainidx, int *al);
 271 #endif
 272 EXT_RETURN tls_construct_stoc_etm(SSL *s, WPACKET *pkt, unsigned int context,
 273                                   X509 *x, size_t chainidx, int *al);
 274 EXT_RETURN tls_construct_stoc_ems(SSL *s, WPACKET *pkt, unsigned int context,
 275                                   X509 *x, size_t chainidx, int *al);
 276 EXT_RETURN tls_construct_stoc_key_share(SSL *s, WPACKET *pkt,
 277                                         unsigned int context, X509 *x,
 278                                         size_t chainidx, int *al);
 279 /*
 280  * Not in public headers as this is not an official extension. Only used when
 281  * SSL_OP_CRYPTOPRO_TLSEXT_BUG is set.
 282  */
 283 #define TLSEXT_TYPE_cryptopro_bug      0xfde8
 284 EXT_RETURN tls_construct_stoc_cryptopro_bug(SSL *s, WPACKET *pkt,
 285                                             unsigned int context, X509 *x,
 286                                             size_t chainidx, int *al);
 287 EXT_RETURN tls_construct_stoc_psk(SSL *s, WPACKET *pkt, unsigned int context,
 288                                   X509 *x, size_t chainidx, int *al);
 289
 290 /* Client Extension processing */
 291 EXT_RETURN tls_construct_ctos_renegotiate(SSL *s, WPACKET *pkt, unsigned int context,
 292                                    X509 *x, size_t chainidx, int *al);
 293 EXT_RETURN tls_construct_ctos_server_name(SSL *s, WPACKET *pkt, unsigned int context,
 294                                    X509 *x, size_t chainidx, int *al);
 295 EXT_RETURN tls_construct_ctos_maxfragmentlen(SSL *s, WPACKET *pkt, unsigned int context,
 296                                              X509 *x, size_t chainidx, int *al);
 297 #ifndef OPENSSL_NO_SRP
 298 EXT_RETURN tls_construct_ctos_srp(SSL *s, WPACKET *pkt, unsigned int context, X509 *x,
 299                            size_t chainidx, int *al);
 300 #endif
 301 #ifndef OPENSSL_NO_EC
 302 EXT_RETURN tls_construct_ctos_ec_pt_formats(SSL *s, WPACKET *pkt,
 303                                             unsigned int context, X509 *x,
 304                                             size_t chainidx, int *al);
 305 EXT_RETURN tls_construct_ctos_supported_groups(SSL *s, WPACKET *pkt,
 306                                                unsigned int context, X509 *x,
 307                                                size_t chainidx, int *al);
 308 #endif
 309 EXT_RETURN tls_construct_ctos_early_data(SSL *s, WPACKET *pkt,
 310                                          unsigned int context, X509 *x,
 311                                          size_t chainidx, int *al);
 312 EXT_RETURN tls_construct_ctos_session_ticket(SSL *s, WPACKET *pkt,
 313                                              unsigned int context, X509 *x,
 314                                              size_t chainidx, int *al);
 315 EXT_RETURN tls_construct_ctos_sig_algs(SSL *s, WPACKET *pkt,
 316                                        unsigned int context, X509 *x,
 317                                        size_t chainidx, int *al);
 318 #ifndef OPENSSL_NO_OCSP
 319 EXT_RETURN tls_construct_ctos_status_request(SSL *s, WPACKET *pkt,
 320                                              unsigned int context, X509 *x,
 321                                              size_t chainidx, int *al);
 322 #endif
 323 #ifndef OPENSSL_NO_NEXTPROTONEG
 324 EXT_RETURN tls_construct_ctos_npn(SSL *s, WPACKET *pkt, unsigned int context,
 325                                   X509 *x, size_t chainidx, int *al);
 326 #endif
 327 EXT_RETURN tls_construct_ctos_alpn(SSL *s, WPACKET *pkt, unsigned int context,
 328                                    X509 *x, size_t chainidx, int *al);
 329 #ifndef OPENSSL_NO_SRTP
 330 EXT_RETURN tls_construct_ctos_use_srtp(SSL *s, WPACKET *pkt, unsigned int context,
 331                                        X509 *x, size_t chainidx, int *al);
 332 #endif
 333 EXT_RETURN tls_construct_ctos_etm(SSL *s, WPACKET *pkt, unsigned int context,
 334                                   X509 *x, size_t chainidx, int *al);
 335 #ifndef OPENSSL_NO_CT
 336 EXT_RETURN tls_construct_ctos_sct(SSL *s, WPACKET *pkt, unsigned int context,
 337                                   X509 *x, size_t chainidx, int *al);
 338 #endif
 339 EXT_RETURN tls_construct_ctos_ems(SSL *s, WPACKET *pkt, unsigned int context,
 340                                   X509 *x, size_t chainidx, int *al);
 341 EXT_RETURN tls_construct_ctos_supported_versions(SSL *s, WPACKET *pkt,
 342                                                  unsigned int context, X509 *x,
 343                                                  size_t chainidx, int *al);
 344 EXT_RETURN tls_construct_ctos_key_share(SSL *s, WPACKET *pkt,
 345                                         unsigned int context, X509 *x,
 346                                         size_t chainidx, int *al);
 347 EXT_RETURN tls_construct_ctos_psk_kex_modes(SSL *s, WPACKET *pkt,
 348                                             unsigned int context, X509 *x,
 349                                             size_t chainidx, int *al);
 350 EXT_RETURN tls_construct_ctos_cookie(SSL *s, WPACKET *pkt, unsigned int context,
 351                                      X509 *x, size_t chainidx, int *al);
 352 EXT_RETURN tls_construct_ctos_padding(SSL *s, WPACKET *pkt,
 353                                       unsigned int context, X509 *x,
 354                                       size_t chainidx, int *al);
 355 EXT_RETURN tls_construct_ctos_psk(SSL *s, WPACKET *pkt, unsigned int context,
 356                                   X509 *x, size_t chainidx, int *al);
 357 int tls_parse_stoc_renegotiate(SSL *s, PACKET *pkt, unsigned int context,
 358                                X509 *x, size_t chainidx, int *al);
 359 int tls_parse_stoc_server_name(SSL *s, PACKET *pkt, unsigned int context,
 360                                X509 *x, size_t chainidx, int *al);
 361 int tls_parse_stoc_early_data(SSL *s, PACKET *pkt, unsigned int context,
 362                               X509 *x, size_t chainidx, int *al);
 363 int tls_parse_stoc_maxfragmentlen(SSL *s, PACKET *pkt, unsigned int context,
 364                                   X509 *x, size_t chainidx, int *al);
 365 #ifndef OPENSSL_NO_EC
 366 int tls_parse_stoc_ec_pt_formats(SSL *s, PACKET *pkt, unsigned int context,
 367                                  X509 *x, size_t chainidx, int *al);
 368 #endif
 369 int tls_parse_stoc_session_ticket(SSL *s, PACKET *pkt, unsigned int context,
 370                                   X509 *x, size_t chainidx, int *al);
 371 #ifndef OPENSSL_NO_OCSP
 372 int tls_parse_stoc_status_request(SSL *s, PACKET *pkt, unsigned int context,
 373                                   X509 *x, size_t chainidx, int *al);
 374 #endif
 375 #ifndef OPENSSL_NO_CT
 376 int tls_parse_stoc_sct(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
 377                        size_t chainidx, int *al);
 378 #endif
 379 #ifndef OPENSSL_NO_NEXTPROTONEG
 380 int tls_parse_stoc_npn(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
 381                        size_t chainidx, int *al);
 382 #endif
 383 int tls_parse_stoc_alpn(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
 384                         size_t chainidx, int *al);
 385 #ifndef OPENSSL_NO_SRTP
 386 int tls_parse_stoc_use_srtp(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
 387                             size_t chainidx, int *al);
 388 #endif
 389 int tls_parse_stoc_etm(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
 390                        size_t chainidx, int *al);
 391 int tls_parse_stoc_ems(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
 392                        size_t chainidx, int *al);
 393 int tls_parse_stoc_key_share(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
 394                              size_t chainidx, int *al);
 395 int tls_parse_stoc_cookie(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
 396                        size_t chainidx, int *al);
 397 int tls_parse_stoc_psk(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
 398                        size_t chainidx, int *al);
 399
 400 int tls_handle_alpn(SSL *s, int *al);