ssl/statem/statem_locl.h

   1 /*
   2  * Copyright 2015-2016 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 #define GET_GROUP_ID(group, idx) \
  59     (unsigned int)(((group)[(idx) * 2] << 8) | (group)[((idx) * 2) + 1])
  60
  61 int check_in_list(SSL *s, unsigned int group_id, const unsigned char *groups,
  62                   size_t num_groups, int checkallow);
  63 int create_synthetic_message_hash(SSL *s);
  64 int parse_ca_names(SSL *s, PACKET *pkt, int *al);
  65 int construct_ca_names(SSL *s, WPACKET *pkt);
  66 size_t construct_key_exchange_tbs(const 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, int *al);
 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 __owur WORK_STATE dtls_wait_for_dry(SSL *s);
 112
 113 /* some client-only functions */
 114 __owur int tls_construct_client_hello(SSL *s, WPACKET *pkt);
 115 __owur MSG_PROCESS_RETURN tls_process_server_hello(SSL *s, PACKET *pkt);
 116 __owur MSG_PROCESS_RETURN tls_process_certificate_request(SSL *s, PACKET *pkt);
 117 __owur MSG_PROCESS_RETURN tls_process_new_session_ticket(SSL *s, PACKET *pkt);
 118 __owur int tls_process_cert_status_body(SSL *s, PACKET *pkt, int *al);
 119 __owur MSG_PROCESS_RETURN tls_process_cert_status(SSL *s, PACKET *pkt);
 120 __owur MSG_PROCESS_RETURN tls_process_server_done(SSL *s, PACKET *pkt);
 121 __owur int tls_construct_cert_verify(SSL *s, WPACKET *pkt);
 122 __owur WORK_STATE tls_prepare_client_certificate(SSL *s, WORK_STATE wst);
 123 __owur int tls_construct_client_certificate(SSL *s, WPACKET *pkt);
 124 __owur int ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey);
 125 __owur int tls_construct_client_key_exchange(SSL *s, WPACKET *pkt);
 126 __owur int tls_client_key_exchange_post_work(SSL *s);
 127 __owur int tls_construct_cert_status_body(SSL *s, WPACKET *pkt);
 128 __owur int tls_construct_cert_status(SSL *s, WPACKET *pkt);
 129 __owur MSG_PROCESS_RETURN tls_process_key_exchange(SSL *s, PACKET *pkt);
 130 __owur MSG_PROCESS_RETURN tls_process_server_certificate(SSL *s, PACKET *pkt);
 131 __owur int ssl3_check_cert_and_algorithm(SSL *s);
 132 #ifndef OPENSSL_NO_NEXTPROTONEG
 133 __owur int tls_construct_next_proto(SSL *s, WPACKET *pkt);
 134 #endif
 135 __owur MSG_PROCESS_RETURN tls_process_hello_req(SSL *s, PACKET *pkt);
 136 __owur MSG_PROCESS_RETURN dtls_process_hello_verify(SSL *s, PACKET *pkt);
 137 __owur int tls_construct_end_of_early_data(SSL *s, WPACKET *pkt);
 138
 139 /* some server-only functions */
 140 __owur MSG_PROCESS_RETURN tls_process_client_hello(SSL *s, PACKET *pkt);
 141 __owur WORK_STATE tls_post_process_client_hello(SSL *s, WORK_STATE wst);
 142 __owur int tls_construct_server_hello(SSL *s, WPACKET *pkt);
 143 __owur int dtls_construct_hello_verify_request(SSL *s, WPACKET *pkt);
 144 __owur int tls_construct_server_certificate(SSL *s, WPACKET *pkt);
 145 __owur int tls_construct_server_key_exchange(SSL *s, WPACKET *pkt);
 146 __owur int tls_construct_certificate_request(SSL *s, WPACKET *pkt);
 147 __owur int tls_construct_server_done(SSL *s, WPACKET *pkt);
 148 __owur MSG_PROCESS_RETURN tls_process_client_certificate(SSL *s, PACKET *pkt);
 149 __owur MSG_PROCESS_RETURN tls_process_client_key_exchange(SSL *s, PACKET *pkt);
 150 __owur WORK_STATE tls_post_process_client_key_exchange(SSL *s, WORK_STATE wst);
 151 __owur MSG_PROCESS_RETURN tls_process_cert_verify(SSL *s, PACKET *pkt);
 152 #ifndef OPENSSL_NO_NEXTPROTONEG
 153 __owur MSG_PROCESS_RETURN tls_process_next_proto(SSL *s, PACKET *pkt);
 154 #endif
 155 __owur int tls_construct_new_session_ticket(SSL *s, WPACKET *pkt);
 156 MSG_PROCESS_RETURN tls_process_end_of_early_data(SSL *s, PACKET *pkt);
 157
 158
 159 /* Extension processing */
 160
 161 typedef enum ext_return_en {
 162     EXT_RETURN_FAIL,
 163     EXT_RETURN_SENT,
 164     EXT_RETURN_NOT_SENT
 165 } EXT_RETURN;
 166
 167 __owur int extension_is_relevant(SSL *s, unsigned int extctx,
 168                                  unsigned int thisctx);
 169 __owur int tls_collect_extensions(SSL *s, PACKET *packet, unsigned int context,
 170                                   RAW_EXTENSION **res, int *al, size_t *len,
 171                                   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                                int *al);
 175 __owur int tls_parse_all_extensions(SSL *s, int context, RAW_EXTENSION *exts,
 176                                     X509 *x, size_t chainidx, int *al, int fin);
 177 __owur int should_add_extension(SSL *s, unsigned int extctx,
 178                                 unsigned int thisctx, int max_version);
 179 __owur int tls_construct_extensions(SSL *s, WPACKET *pkt, unsigned int context,
 180                                     X509 *x, size_t chainidx, int *al);
 181
 182 __owur int tls_psk_do_binder(SSL *s, const EVP_MD *md,
 183                              const unsigned char *msgstart,
 184                              size_t binderoffset, const unsigned char *binderin,
 185                              unsigned char *binderout,
 186                              SSL_SESSION *sess, int sign, int external);
 187
 188 /* Server Extension processing */
 189 int tls_parse_ctos_renegotiate(SSL *s, PACKET *pkt, unsigned int context,
 190                                X509 *x, size_t chainidx, int *al);
 191 int tls_parse_ctos_server_name(SSL *s, PACKET *pkt, unsigned int context,
 192                                X509 *x, size_t chainidx, int *al);
 193 #ifndef OPENSSL_NO_SRP
 194 int tls_parse_ctos_srp(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
 195                        size_t chainidx, int *al);
 196 #endif
 197 int tls_parse_ctos_early_data(SSL *s, PACKET *pkt, unsigned int context,
 198                               X509 *x, size_t chainidx, int *al);
 199 #ifndef OPENSSL_NO_EC
 200 int tls_parse_ctos_ec_pt_formats(SSL *s, PACKET *pkt, unsigned int context,
 201                                  X509 *x, size_t chainidx, int *al);
 202 int tls_parse_ctos_supported_groups(SSL *s, PACKET *pkt, unsigned int context,
 203                                     X509 *x, size_t chainidx, int *al);
 204 #endif
 205 int tls_parse_ctos_session_ticket(SSL *s, PACKET *pkt, unsigned int context,
 206                                   X509 *x, size_t chainidx, int *al);
 207 int tls_parse_ctos_sig_algs(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
 208                             size_t chainidx, int *al);
 209 #ifndef OPENSSL_NO_OCSP
 210 int tls_parse_ctos_status_request(SSL *s, PACKET *pkt, unsigned int context,
 211                                   X509 *x, size_t chainidx, int *al);
 212 #endif
 213 #ifndef OPENSSL_NO_NEXTPROTONEG
 214 int tls_parse_ctos_npn(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
 215                        size_t chainidx, int *al);
 216 #endif
 217 int tls_parse_ctos_alpn(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
 218                         size_t chainidx, int *al);
 219 #ifndef OPENSSL_NO_SRTP
 220 int tls_parse_ctos_use_srtp(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
 221                             size_t chainidx, int *al);
 222 #endif
 223 int tls_parse_ctos_etm(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
 224                        size_t chainidx, int *al);
 225 int tls_parse_ctos_key_share(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
 226                              size_t chainidx, int *al);
 227 int tls_parse_ctos_ems(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
 228                        size_t chainidx, int *al);
 229 int tls_parse_ctos_psk_kex_modes(SSL *s, PACKET *pkt, unsigned int context,
 230                                  X509 *x, size_t chainidx, int *al);
 231 int tls_parse_ctos_psk(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
 232                        size_t chainidx, int *al);
 233
 234 EXT_RETURN tls_construct_stoc_renegotiate(SSL *s, WPACKET *pkt,
 235                                           unsigned int context, X509 *x,
 236                                           size_t chainidx, int *al);
 237 EXT_RETURN tls_construct_stoc_server_name(SSL *s, WPACKET *pkt,
 238                                           unsigned int context, X509 *x,
 239                                           size_t chainidx, int *al);
 240 EXT_RETURN tls_construct_stoc_early_data(SSL *s, WPACKET *pkt,
 241                                          unsigned int context, X509 *x,
 242                                          size_t chainidx, int *al);
 243 #ifndef OPENSSL_NO_EC
 244 EXT_RETURN tls_construct_stoc_ec_pt_formats(SSL *s, WPACKET *pkt,
 245                                             unsigned int context, X509 *x,
 246                                             size_t chainidx, int *al);
 247 #endif
 248 EXT_RETURN tls_construct_stoc_supported_groups(SSL *s, WPACKET *pkt,
 249                                                unsigned int context, X509 *x,
 250                                                size_t chainidx, int *al);
 251 EXT_RETURN tls_construct_stoc_session_ticket(SSL *s, WPACKET *pkt,
 252                                              unsigned int context, X509 *x,
 253                                              size_t chainidx, int *al);
 254 #ifndef OPENSSL_NO_OCSP
 255 EXT_RETURN tls_construct_stoc_status_request(SSL *s, WPACKET *pkt,
 256                                              unsigned int context, X509 *x,
 257                                              size_t chainidx, int *al);
 258 #endif
 259 #ifndef OPENSSL_NO_NEXTPROTONEG
 260 EXT_RETURN tls_construct_stoc_next_proto_neg(SSL *s, WPACKET *pkt,
 261                                              unsigned int context, X509 *x,
 262                                              size_t chainidx, int *al);
 263 #endif
 264 EXT_RETURN tls_construct_stoc_alpn(SSL *s, WPACKET *pkt, unsigned int context,
 265                                    X509 *x, size_t chainidx, int *al);
 266 #ifndef OPENSSL_NO_SRTP
 267 EXT_RETURN tls_construct_stoc_use_srtp(SSL *s, WPACKET *pkt, unsigned int context,
 268                                 X509 *x, size_t chainidx, int *al);
 269 #endif
 270 EXT_RETURN tls_construct_stoc_etm(SSL *s, WPACKET *pkt, unsigned int context,
 271                                   X509 *x, size_t chainidx, int *al);
 272 EXT_RETURN tls_construct_stoc_ems(SSL *s, WPACKET *pkt, unsigned int context,
 273                                   X509 *x, size_t chainidx, int *al);
 274 EXT_RETURN tls_construct_stoc_key_share(SSL *s, WPACKET *pkt,
 275                                         unsigned int context, X509 *x,
 276                                         size_t chainidx, int *al);
 277 /*
 278  * Not in public headers as this is not an official extension. Only used when
 279  * SSL_OP_CRYPTOPRO_TLSEXT_BUG is set.
 280  */
 281 #define TLSEXT_TYPE_cryptopro_bug      0xfde8
 282 EXT_RETURN tls_construct_stoc_cryptopro_bug(SSL *s, WPACKET *pkt,
 283                                             unsigned int context, X509 *x,
 284                                             size_t chainidx, int *al);
 285 EXT_RETURN tls_construct_stoc_psk(SSL *s, WPACKET *pkt, unsigned int context,
 286                                   X509 *x, size_t chainidx, int *al);
 287
 288 /* Client Extension processing */
 289 EXT_RETURN tls_construct_ctos_renegotiate(SSL *s, WPACKET *pkt, unsigned int context,
 290                                    X509 *x, size_t chainidx, int *al);
 291 EXT_RETURN tls_construct_ctos_server_name(SSL *s, WPACKET *pkt, unsigned int context,
 292                                    X509 *x, size_t chainidx, int *al);
 293 #ifndef OPENSSL_NO_SRP
 294 EXT_RETURN tls_construct_ctos_srp(SSL *s, WPACKET *pkt, unsigned int context, X509 *x,
 295                            size_t chainidx, int *al);
 296 #endif
 297 #ifndef OPENSSL_NO_EC
 298 EXT_RETURN tls_construct_ctos_ec_pt_formats(SSL *s, WPACKET *pkt,
 299                                             unsigned int context, X509 *x,
 300                                             size_t chainidx, int *al);
 301 EXT_RETURN tls_construct_ctos_supported_groups(SSL *s, WPACKET *pkt,
 302                                                unsigned int context, X509 *x,
 303                                                size_t chainidx, int *al);
 304 #endif
 305 EXT_RETURN tls_construct_ctos_early_data(SSL *s, WPACKET *pkt,
 306                                          unsigned int context, X509 *x,
 307                                          size_t chainidx, int *al);
 308 EXT_RETURN tls_construct_ctos_session_ticket(SSL *s, WPACKET *pkt,
 309                                              unsigned int context, X509 *x,
 310                                              size_t chainidx, int *al);
 311 EXT_RETURN tls_construct_ctos_sig_algs(SSL *s, WPACKET *pkt,
 312                                        unsigned int context, X509 *x,
 313                                        size_t chainidx, int *al);
 314 #ifndef OPENSSL_NO_OCSP
 315 EXT_RETURN tls_construct_ctos_status_request(SSL *s, WPACKET *pkt,
 316                                              unsigned int context, X509 *x,
 317                                              size_t chainidx, int *al);
 318 #endif
 319 #ifndef OPENSSL_NO_NEXTPROTONEG
 320 EXT_RETURN tls_construct_ctos_npn(SSL *s, WPACKET *pkt, unsigned int context,
 321                                   X509 *x, size_t chainidx, int *al);
 322 #endif
 323 EXT_RETURN tls_construct_ctos_alpn(SSL *s, WPACKET *pkt, unsigned int context,
 324                                    X509 *x, size_t chainidx, int *al);
 325 #ifndef OPENSSL_NO_SRTP
 326 EXT_RETURN tls_construct_ctos_use_srtp(SSL *s, WPACKET *pkt, unsigned int context,
 327                                        X509 *x, size_t chainidx, int *al);
 328 #endif
 329 EXT_RETURN tls_construct_ctos_etm(SSL *s, WPACKET *pkt, unsigned int context,
 330                                   X509 *x, size_t chainidx, int *al);
 331 #ifndef OPENSSL_NO_CT
 332 EXT_RETURN tls_construct_ctos_sct(SSL *s, WPACKET *pkt, unsigned int context,
 333                                   X509 *x, size_t chainidx, int *al);
 334 #endif
 335 EXT_RETURN tls_construct_ctos_ems(SSL *s, WPACKET *pkt, unsigned int context,
 336                                   X509 *x, size_t chainidx, int *al);
 337 EXT_RETURN tls_construct_ctos_supported_versions(SSL *s, WPACKET *pkt,
 338                                                  unsigned int context, X509 *x,
 339                                                  size_t chainidx, int *al);
 340 EXT_RETURN tls_construct_ctos_key_share(SSL *s, WPACKET *pkt,
 341                                         unsigned int context, X509 *x,
 342                                         size_t chainidx, int *al);
 343 EXT_RETURN tls_construct_ctos_psk_kex_modes(SSL *s, WPACKET *pkt,
 344                                             unsigned int context, X509 *x,
 345                                             size_t chainidx, int *al);
 346 EXT_RETURN tls_construct_ctos_cookie(SSL *s, WPACKET *pkt, unsigned int context,
 347                                      X509 *x, size_t chainidx, int *al);
 348 EXT_RETURN tls_construct_ctos_padding(SSL *s, WPACKET *pkt,
 349                                       unsigned int context, X509 *x,
 350                                       size_t chainidx, int *al);
 351 EXT_RETURN tls_construct_ctos_psk(SSL *s, WPACKET *pkt, unsigned int context,
 352                                   X509 *x, size_t chainidx, int *al);
 353 int tls_parse_stoc_renegotiate(SSL *s, PACKET *pkt, unsigned int context,
 354                                X509 *x, size_t chainidx, int *al);
 355 int tls_parse_stoc_server_name(SSL *s, PACKET *pkt, unsigned int context,
 356                                X509 *x, size_t chainidx, int *al);
 357 int tls_parse_stoc_early_data(SSL *s, PACKET *pkt, unsigned int context,
 358                               X509 *x, size_t chainidx, int *al);
 359 #ifndef OPENSSL_NO_EC
 360 int tls_parse_stoc_ec_pt_formats(SSL *s, PACKET *pkt, unsigned int context,
 361                                  X509 *x, size_t chainidx, int *al);
 362 #endif
 363 int tls_parse_stoc_session_ticket(SSL *s, PACKET *pkt, unsigned int context,
 364                                   X509 *x, size_t chainidx, int *al);
 365 #ifndef OPENSSL_NO_OCSP
 366 int tls_parse_stoc_status_request(SSL *s, PACKET *pkt, unsigned int context,
 367                                   X509 *x, size_t chainidx, int *al);
 368 #endif
 369 #ifndef OPENSSL_NO_CT
 370 int tls_parse_stoc_sct(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
 371                        size_t chainidx, int *al);
 372 #endif
 373 #ifndef OPENSSL_NO_NEXTPROTONEG
 374 int tls_parse_stoc_npn(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
 375                        size_t chainidx, int *al);
 376 #endif
 377 int tls_parse_stoc_alpn(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
 378                         size_t chainidx, int *al);
 379 #ifndef OPENSSL_NO_SRTP
 380 int tls_parse_stoc_use_srtp(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
 381                             size_t chainidx, int *al);
 382 #endif
 383 int tls_parse_stoc_etm(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
 384                        size_t chainidx, int *al);
 385 int tls_parse_stoc_ems(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
 386                        size_t chainidx, int *al);
 387 int tls_parse_stoc_key_share(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
 388                              size_t chainidx, int *al);
 389 int tls_parse_stoc_cookie(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
 390                        size_t chainidx, int *al);
 391 int tls_parse_stoc_psk(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
 392                        size_t chainidx, int *al);
 393
 394 int tls_handle_alpn(SSL *s, int *al);