1/* 2 * SSL/TLS interface definition 3 * Copyright (c) 2004-2013, Jouni Malinen <j@w1.fi> 4 * 5 * This software may be distributed under the terms of the BSD license. 6 * See README for more details. 7 */ 8 9#ifndef TLS_H 10#define TLS_H 11 12struct tls_connection; 13 14struct tls_random { 15 const u8 *client_random; 16 size_t client_random_len; 17 const u8 *server_random; 18 size_t server_random_len; 19}; 20 21enum tls_event { 22 TLS_CERT_CHAIN_SUCCESS, 23 TLS_CERT_CHAIN_FAILURE, 24 TLS_PEER_CERTIFICATE, 25 TLS_ALERT 26}; 27 28/* 29 * Note: These are used as identifier with external programs and as such, the 30 * values must not be changed. 31 */ 32enum tls_fail_reason { 33 TLS_FAIL_UNSPECIFIED = 0, 34 TLS_FAIL_UNTRUSTED = 1, 35 TLS_FAIL_REVOKED = 2, 36 TLS_FAIL_NOT_YET_VALID = 3, 37 TLS_FAIL_EXPIRED = 4, 38 TLS_FAIL_SUBJECT_MISMATCH = 5, 39 TLS_FAIL_ALTSUBJECT_MISMATCH = 6, 40 TLS_FAIL_BAD_CERTIFICATE = 7, 41 TLS_FAIL_SERVER_CHAIN_PROBE = 8, 42 TLS_FAIL_DOMAIN_SUFFIX_MISMATCH = 9, 43 TLS_FAIL_DOMAIN_MISMATCH = 10, 44 TLS_FAIL_INSUFFICIENT_KEY_LEN = 11, 45}; 46 47 48#define TLS_MAX_ALT_SUBJECT 10 49 50union tls_event_data { 51 struct { 52 int depth; 53 const char *subject; 54 enum tls_fail_reason reason; 55 const char *reason_txt; 56 const struct wpabuf *cert; 57 } cert_fail; 58 59 struct { 60 int depth; 61 const char *subject; 62 const struct wpabuf *cert; 63 const u8 *hash; 64 size_t hash_len; 65 const char *altsubject[TLS_MAX_ALT_SUBJECT]; 66 int num_altsubject; 67 } peer_cert; 68 69 struct { 70 int is_local; 71 const char *type; 72 const char *description; 73 } alert; 74}; 75 76struct tls_config { 77 const char *opensc_engine_path; 78 const char *pkcs11_engine_path; 79 const char *pkcs11_module_path; 80 int fips_mode; 81 int cert_in_cb; 82 const char *openssl_ciphers; 83 unsigned int tls_session_lifetime; 84 unsigned int tls_flags; 85 86 void (*event_cb)(void *ctx, enum tls_event ev, 87 union tls_event_data *data); 88 void *cb_ctx; 89}; 90 91#define TLS_CONN_ALLOW_SIGN_RSA_MD5 BIT(0) 92#define TLS_CONN_DISABLE_TIME_CHECKS BIT(1) 93#define TLS_CONN_DISABLE_SESSION_TICKET BIT(2) 94#define TLS_CONN_REQUEST_OCSP BIT(3) 95#define TLS_CONN_REQUIRE_OCSP BIT(4) 96#define TLS_CONN_DISABLE_TLSv1_1 BIT(5) 97#define TLS_CONN_DISABLE_TLSv1_2 BIT(6) 98#define TLS_CONN_EAP_FAST BIT(7) 99#define TLS_CONN_DISABLE_TLSv1_0 BIT(8) 100#define TLS_CONN_EXT_CERT_CHECK BIT(9) 101#define TLS_CONN_REQUIRE_OCSP_ALL BIT(10) 102#define TLS_CONN_SUITEB BIT(11) 103#define TLS_CONN_SUITEB_NO_ECDH BIT(12) 104 105/** 106 * struct tls_connection_params - Parameters for TLS connection 107 * @ca_cert: File or reference name for CA X.509 certificate in PEM or DER 108 * format 109 * @ca_cert_blob: ca_cert as inlined data or %NULL if not used 110 * @ca_cert_blob_len: ca_cert_blob length 111 * @ca_path: Path to CA certificates (OpenSSL specific) 112 * @subject_match: String to match in the subject of the peer certificate or 113 * %NULL to allow all subjects 114 * @altsubject_match: String to match in the alternative subject of the peer 115 * certificate or %NULL to allow all alternative subjects 116 * @suffix_match: String to suffix match in the dNSName or CN of the peer 117 * certificate or %NULL to allow all domain names. This may allow subdomains an 118 * wildcard certificates. Each domain name label must have a full match. 119 * @domain_match: String to match in the dNSName or CN of the peer 120 * certificate or %NULL to allow all domain names. This requires a full, 121 * case-insensitive match. 122 * @client_cert: File or reference name for client X.509 certificate in PEM or 123 * DER format 124 * @client_cert_blob: client_cert as inlined data or %NULL if not used 125 * @client_cert_blob_len: client_cert_blob length 126 * @private_key: File or reference name for client private key in PEM or DER 127 * format (traditional format (RSA PRIVATE KEY) or PKCS#8 (PRIVATE KEY) 128 * @private_key_blob: private_key as inlined data or %NULL if not used 129 * @private_key_blob_len: private_key_blob length 130 * @private_key_passwd: Passphrase for decrypted private key, %NULL if no 131 * passphrase is used. 132 * @dh_file: File name for DH/DSA data in PEM format, or %NULL if not used 133 * @dh_blob: dh_file as inlined data or %NULL if not used 134 * @dh_blob_len: dh_blob length 135 * @engine: 1 = use engine (e.g., a smartcard) for private key operations 136 * (this is OpenSSL specific for now) 137 * @engine_id: engine id string (this is OpenSSL specific for now) 138 * @ppin: pointer to the pin variable in the configuration 139 * (this is OpenSSL specific for now) 140 * @key_id: the private key's id when using engine (this is OpenSSL 141 * specific for now) 142 * @cert_id: the certificate's id when using engine 143 * @ca_cert_id: the CA certificate's id when using engine 144 * @openssl_ciphers: OpenSSL cipher configuration 145 * @flags: Parameter options (TLS_CONN_*) 146 * @ocsp_stapling_response: DER encoded file with cached OCSP stapling response 147 * or %NULL if OCSP is not enabled 148 * @ocsp_stapling_response_multi: DER encoded file with cached OCSP stapling 149 * response list (OCSPResponseList for ocsp_multi in RFC 6961) or %NULL if 150 * ocsp_multi is not enabled 151 * 152 * TLS connection parameters to be configured with tls_connection_set_params() 153 * and tls_global_set_params(). 154 * 155 * Certificates and private key can be configured either as a reference name 156 * (file path or reference to certificate store) or by providing the same data 157 * as a pointer to the data in memory. Only one option will be used for each 158 * field. 159 */ 160struct tls_connection_params { 161 const char *ca_cert; 162 const u8 *ca_cert_blob; 163 size_t ca_cert_blob_len; 164 const char *ca_path; 165 const char *subject_match; 166 const char *altsubject_match; 167 const char *suffix_match; 168 const char *domain_match; 169 const char *client_cert; 170 const u8 *client_cert_blob; 171 size_t client_cert_blob_len; 172 const char *private_key; 173 const u8 *private_key_blob; 174 size_t private_key_blob_len; 175 const char *private_key_passwd; 176 const char *dh_file; 177 const u8 *dh_blob; 178 size_t dh_blob_len; 179 180 /* OpenSSL specific variables */ 181 int engine; 182 const char *engine_id; 183 const char *pin; 184 const char *key_id; 185 const char *cert_id; 186 const char *ca_cert_id; 187 const char *openssl_ciphers; 188 189 unsigned int flags; 190 const char *ocsp_stapling_response; 191 const char *ocsp_stapling_response_multi; 192}; 193 194 195/** 196 * tls_init - Initialize TLS library 197 * @conf: Configuration data for TLS library 198 * Returns: Context data to be used as tls_ctx in calls to other functions, 199 * or %NULL on failure. 200 * 201 * Called once during program startup and once for each RSN pre-authentication 202 * session. In other words, there can be two concurrent TLS contexts. If global 203 * library initialization is needed (i.e., one that is shared between both 204 * authentication types), the TLS library wrapper should maintain a reference 205 * counter and do global initialization only when moving from 0 to 1 reference. 206 */ 207void * tls_init(const struct tls_config *conf); 208 209/** 210 * tls_deinit - Deinitialize TLS library 211 * @tls_ctx: TLS context data from tls_init() 212 * 213 * Called once during program shutdown and once for each RSN pre-authentication 214 * session. If global library deinitialization is needed (i.e., one that is 215 * shared between both authentication types), the TLS library wrapper should 216 * maintain a reference counter and do global deinitialization only when moving 217 * from 1 to 0 references. 218 */ 219void tls_deinit(void *tls_ctx); 220 221/** 222 * tls_get_errors - Process pending errors 223 * @tls_ctx: TLS context data from tls_init() 224 * Returns: Number of found error, 0 if no errors detected. 225 * 226 * Process all pending TLS errors. 227 */ 228int tls_get_errors(void *tls_ctx); 229 230/** 231 * tls_connection_init - Initialize a new TLS connection 232 * @tls_ctx: TLS context data from tls_init() 233 * Returns: Connection context data, conn for other function calls 234 */ 235struct tls_connection * tls_connection_init(void *tls_ctx); 236 237/** 238 * tls_connection_deinit - Free TLS connection data 239 * @tls_ctx: TLS context data from tls_init() 240 * @conn: Connection context data from tls_connection_init() 241 * 242 * Release all resources allocated for TLS connection. 243 */ 244void tls_connection_deinit(void *tls_ctx, struct tls_connection *conn); 245 246/** 247 * tls_connection_established - Has the TLS connection been completed? 248 * @tls_ctx: TLS context data from tls_init() 249 * @conn: Connection context data from tls_connection_init() 250 * Returns: 1 if TLS connection has been completed, 0 if not. 251 */ 252int tls_connection_established(void *tls_ctx, struct tls_connection *conn); 253 254/** 255 * tls_connection_shutdown - Shutdown TLS connection 256 * @tls_ctx: TLS context data from tls_init() 257 * @conn: Connection context data from tls_connection_init() 258 * Returns: 0 on success, -1 on failure 259 * 260 * Shutdown current TLS connection without releasing all resources. New 261 * connection can be started by using the same conn without having to call 262 * tls_connection_init() or setting certificates etc. again. The new 263 * connection should try to use session resumption. 264 */ 265int tls_connection_shutdown(void *tls_ctx, struct tls_connection *conn); 266 267enum { 268 TLS_SET_PARAMS_ENGINE_PRV_BAD_PIN = -4, 269 TLS_SET_PARAMS_ENGINE_PRV_VERIFY_FAILED = -3, 270 TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED = -2 271}; 272 273/** 274 * tls_connection_set_params - Set TLS connection parameters 275 * @tls_ctx: TLS context data from tls_init() 276 * @conn: Connection context data from tls_connection_init() 277 * @params: Connection parameters 278 * Returns: 0 on success, -1 on failure, 279 * TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED (-2) on error causing PKCS#11 engine 280 * failure, or 281 * TLS_SET_PARAMS_ENGINE_PRV_VERIFY_FAILED (-3) on failure to verify the 282 * PKCS#11 engine private key, or 283 * TLS_SET_PARAMS_ENGINE_PRV_BAD_PIN (-4) on PIN error causing PKCS#11 engine 284 * failure. 285 */ 286int __must_check 287tls_connection_set_params(void *tls_ctx, struct tls_connection *conn, 288 const struct tls_connection_params *params); 289 290/** 291 * tls_global_set_params - Set TLS parameters for all TLS connection 292 * @tls_ctx: TLS context data from tls_init() 293 * @params: Global TLS parameters 294 * Returns: 0 on success, -1 on failure, 295 * TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED (-2) on error causing PKCS#11 engine 296 * failure, or 297 * TLS_SET_PARAMS_ENGINE_PRV_VERIFY_FAILED (-3) on failure to verify the 298 * PKCS#11 engine private key, or 299 * TLS_SET_PARAMS_ENGINE_PRV_BAD_PIN (-4) on PIN error causing PKCS#11 engine 300 * failure. 301 */ 302int __must_check tls_global_set_params( 303 void *tls_ctx, const struct tls_connection_params *params); 304 305/** 306 * tls_global_set_verify - Set global certificate verification options 307 * @tls_ctx: TLS context data from tls_init() 308 * @check_crl: 0 = do not verify CRLs, 1 = verify CRL for the user certificate, 309 * 2 = verify CRL for all certificates 310 * Returns: 0 on success, -1 on failure 311 */ 312int __must_check tls_global_set_verify(void *tls_ctx, int check_crl); 313 314/** 315 * tls_connection_set_verify - Set certificate verification options 316 * @tls_ctx: TLS context data from tls_init() 317 * @conn: Connection context data from tls_connection_init() 318 * @verify_peer: 1 = verify peer certificate 319 * @flags: Connection flags (TLS_CONN_*) 320 * @session_ctx: Session caching context or %NULL to use default 321 * @session_ctx_len: Length of @session_ctx in bytes. 322 * Returns: 0 on success, -1 on failure 323 */ 324int __must_check tls_connection_set_verify(void *tls_ctx, 325 struct tls_connection *conn, 326 int verify_peer, 327 unsigned int flags, 328 const u8 *session_ctx, 329 size_t session_ctx_len); 330 331/** 332 * tls_connection_get_random - Get random data from TLS connection 333 * @tls_ctx: TLS context data from tls_init() 334 * @conn: Connection context data from tls_connection_init() 335 * @data: Structure of client/server random data (filled on success) 336 * Returns: 0 on success, -1 on failure 337 */ 338int __must_check tls_connection_get_random(void *tls_ctx, 339 struct tls_connection *conn, 340 struct tls_random *data); 341 342/** 343 * tls_connection_export_key - Derive keying material from a TLS connection 344 * @tls_ctx: TLS context data from tls_init() 345 * @conn: Connection context data from tls_connection_init() 346 * @label: Label (e.g., description of the key) for PRF 347 * @out: Buffer for output data from TLS-PRF 348 * @out_len: Length of the output buffer 349 * Returns: 0 on success, -1 on failure 350 * 351 * Exports keying material using the mechanism described in RFC 5705. 352 */ 353int __must_check tls_connection_export_key(void *tls_ctx, 354 struct tls_connection *conn, 355 const char *label, 356 u8 *out, size_t out_len); 357 358/** 359 * tls_connection_get_eap_fast_key - Derive key material for EAP-FAST 360 * @tls_ctx: TLS context data from tls_init() 361 * @conn: Connection context data from tls_connection_init() 362 * @out: Buffer for output data from TLS-PRF 363 * @out_len: Length of the output buffer 364 * Returns: 0 on success, -1 on failure 365 * 366 * Exports key material after the normal TLS key block for use with 367 * EAP-FAST. Most callers will want tls_connection_export_key(), but EAP-FAST 368 * uses a different legacy mechanism. 369 */ 370int __must_check tls_connection_get_eap_fast_key(void *tls_ctx, 371 struct tls_connection *conn, 372 u8 *out, size_t out_len); 373 374/** 375 * tls_connection_handshake - Process TLS handshake (client side) 376 * @tls_ctx: TLS context data from tls_init() 377 * @conn: Connection context data from tls_connection_init() 378 * @in_data: Input data from TLS server 379 * @appl_data: Pointer to application data pointer, or %NULL if dropped 380 * Returns: Output data, %NULL on failure 381 * 382 * The caller is responsible for freeing the returned output data. If the final 383 * handshake message includes application data, this is decrypted and 384 * appl_data (if not %NULL) is set to point this data. The caller is 385 * responsible for freeing appl_data. 386 * 387 * This function is used during TLS handshake. The first call is done with 388 * in_data == %NULL and the library is expected to return ClientHello packet. 389 * This packet is then send to the server and a response from server is given 390 * to TLS library by calling this function again with in_data pointing to the 391 * TLS message from the server. 392 * 393 * If the TLS handshake fails, this function may return %NULL. However, if the 394 * TLS library has a TLS alert to send out, that should be returned as the 395 * output data. In this case, tls_connection_get_failed() must return failure 396 * (> 0). 397 * 398 * tls_connection_established() should return 1 once the TLS handshake has been 399 * completed successfully. 400 */ 401struct wpabuf * tls_connection_handshake(void *tls_ctx, 402 struct tls_connection *conn, 403 const struct wpabuf *in_data, 404 struct wpabuf **appl_data); 405 406struct wpabuf * tls_connection_handshake2(void *tls_ctx, 407 struct tls_connection *conn, 408 const struct wpabuf *in_data, 409 struct wpabuf **appl_data, 410 int *more_data_needed); 411 412/** 413 * tls_connection_server_handshake - Process TLS handshake (server side) 414 * @tls_ctx: TLS context data from tls_init() 415 * @conn: Connection context data from tls_connection_init() 416 * @in_data: Input data from TLS peer 417 * @appl_data: Pointer to application data pointer, or %NULL if dropped 418 * Returns: Output data, %NULL on failure 419 * 420 * The caller is responsible for freeing the returned output data. 421 */ 422struct wpabuf * tls_connection_server_handshake(void *tls_ctx, 423 struct tls_connection *conn, 424 const struct wpabuf *in_data, 425 struct wpabuf **appl_data); 426 427/** 428 * tls_connection_encrypt - Encrypt data into TLS tunnel 429 * @tls_ctx: TLS context data from tls_init() 430 * @conn: Connection context data from tls_connection_init() 431 * @in_data: Plaintext data to be encrypted 432 * Returns: Encrypted TLS data or %NULL on failure 433 * 434 * This function is used after TLS handshake has been completed successfully to 435 * send data in the encrypted tunnel. The caller is responsible for freeing the 436 * returned output data. 437 */ 438struct wpabuf * tls_connection_encrypt(void *tls_ctx, 439 struct tls_connection *conn, 440 const struct wpabuf *in_data); 441 442/** 443 * tls_connection_decrypt - Decrypt data from TLS tunnel 444 * @tls_ctx: TLS context data from tls_init() 445 * @conn: Connection context data from tls_connection_init() 446 * @in_data: Encrypted TLS data 447 * Returns: Decrypted TLS data or %NULL on failure 448 * 449 * This function is used after TLS handshake has been completed successfully to 450 * receive data from the encrypted tunnel. The caller is responsible for 451 * freeing the returned output data. 452 */ 453struct wpabuf * tls_connection_decrypt(void *tls_ctx, 454 struct tls_connection *conn, 455 const struct wpabuf *in_data); 456 457struct wpabuf * tls_connection_decrypt2(void *tls_ctx, 458 struct tls_connection *conn, 459 const struct wpabuf *in_data, 460 int *more_data_needed); 461 462/** 463 * tls_connection_resumed - Was session resumption used 464 * @tls_ctx: TLS context data from tls_init() 465 * @conn: Connection context data from tls_connection_init() 466 * Returns: 1 if current session used session resumption, 0 if not 467 */ 468int tls_connection_resumed(void *tls_ctx, struct tls_connection *conn); 469 470enum { 471 TLS_CIPHER_NONE, 472 TLS_CIPHER_RC4_SHA /* 0x0005 */, 473 TLS_CIPHER_AES128_SHA /* 0x002f */, 474 TLS_CIPHER_RSA_DHE_AES128_SHA /* 0x0031 */, 475 TLS_CIPHER_ANON_DH_AES128_SHA /* 0x0034 */, 476 TLS_CIPHER_RSA_DHE_AES256_SHA /* 0x0039 */, 477 TLS_CIPHER_AES256_SHA /* 0x0035 */, 478}; 479 480/** 481 * tls_connection_set_cipher_list - Configure acceptable cipher suites 482 * @tls_ctx: TLS context data from tls_init() 483 * @conn: Connection context data from tls_connection_init() 484 * @ciphers: Zero (TLS_CIPHER_NONE) terminated list of allowed ciphers 485 * (TLS_CIPHER_*). 486 * Returns: 0 on success, -1 on failure 487 */ 488int __must_check tls_connection_set_cipher_list(void *tls_ctx, 489 struct tls_connection *conn, 490 u8 *ciphers); 491 492/** 493 * tls_get_version - Get the current TLS version number 494 * @tls_ctx: TLS context data from tls_init() 495 * @conn: Connection context data from tls_connection_init() 496 * @buf: Buffer for returning the TLS version number 497 * @buflen: buf size 498 * Returns: 0 on success, -1 on failure 499 * 500 * Get the currently used TLS version number. 501 */ 502int __must_check tls_get_version(void *tls_ctx, struct tls_connection *conn, 503 char *buf, size_t buflen); 504 505/** 506 * tls_get_cipher - Get current cipher name 507 * @tls_ctx: TLS context data from tls_init() 508 * @conn: Connection context data from tls_connection_init() 509 * @buf: Buffer for the cipher name 510 * @buflen: buf size 511 * Returns: 0 on success, -1 on failure 512 * 513 * Get the name of the currently used cipher. 514 */ 515int __must_check tls_get_cipher(void *tls_ctx, struct tls_connection *conn, 516 char *buf, size_t buflen); 517 518/** 519 * tls_connection_enable_workaround - Enable TLS workaround options 520 * @tls_ctx: TLS context data from tls_init() 521 * @conn: Connection context data from tls_connection_init() 522 * Returns: 0 on success, -1 on failure 523 * 524 * This function is used to enable connection-specific workaround options for 525 * buffer SSL/TLS implementations. 526 */ 527int __must_check tls_connection_enable_workaround(void *tls_ctx, 528 struct tls_connection *conn); 529 530/** 531 * tls_connection_client_hello_ext - Set TLS extension for ClientHello 532 * @tls_ctx: TLS context data from tls_init() 533 * @conn: Connection context data from tls_connection_init() 534 * @ext_type: Extension type 535 * @data: Extension payload (%NULL to remove extension) 536 * @data_len: Extension payload length 537 * Returns: 0 on success, -1 on failure 538 */ 539int __must_check tls_connection_client_hello_ext(void *tls_ctx, 540 struct tls_connection *conn, 541 int ext_type, const u8 *data, 542 size_t data_len); 543 544/** 545 * tls_connection_get_failed - Get connection failure status 546 * @tls_ctx: TLS context data from tls_init() 547 * @conn: Connection context data from tls_connection_init() 548 * 549 * Returns >0 if connection has failed, 0 if not. 550 */ 551int tls_connection_get_failed(void *tls_ctx, struct tls_connection *conn); 552 553/** 554 * tls_connection_get_read_alerts - Get connection read alert status 555 * @tls_ctx: TLS context data from tls_init() 556 * @conn: Connection context data from tls_connection_init() 557 * Returns: Number of times a fatal read (remote end reported error) has 558 * happened during this connection. 559 */ 560int tls_connection_get_read_alerts(void *tls_ctx, struct tls_connection *conn); 561 562/** 563 * tls_connection_get_write_alerts - Get connection write alert status 564 * @tls_ctx: TLS context data from tls_init() 565 * @conn: Connection context data from tls_connection_init() 566 * Returns: Number of times a fatal write (locally detected error) has happened 567 * during this connection. 568 */ 569int tls_connection_get_write_alerts(void *tls_ctx, 570 struct tls_connection *conn); 571 572typedef int (*tls_session_ticket_cb) 573(void *ctx, const u8 *ticket, size_t len, const u8 *client_random, 574 const u8 *server_random, u8 *master_secret); 575 576int __must_check tls_connection_set_session_ticket_cb( 577 void *tls_ctx, struct tls_connection *conn, 578 tls_session_ticket_cb cb, void *ctx); 579 580void tls_connection_set_log_cb(struct tls_connection *conn, 581 void (*log_cb)(void *ctx, const char *msg), 582 void *ctx); 583 584#define TLS_BREAK_VERIFY_DATA BIT(0) 585#define TLS_BREAK_SRV_KEY_X_HASH BIT(1) 586#define TLS_BREAK_SRV_KEY_X_SIGNATURE BIT(2) 587#define TLS_DHE_PRIME_511B BIT(3) 588#define TLS_DHE_PRIME_767B BIT(4) 589#define TLS_DHE_PRIME_15 BIT(5) 590#define TLS_DHE_PRIME_58B BIT(6) 591#define TLS_DHE_NON_PRIME BIT(7) 592 593void tls_connection_set_test_flags(struct tls_connection *conn, u32 flags); 594 595int tls_get_library_version(char *buf, size_t buf_len); 596 597void tls_connection_set_success_data(struct tls_connection *conn, 598 struct wpabuf *data); 599 600void tls_connection_set_success_data_resumed(struct tls_connection *conn); 601 602const struct wpabuf * 603tls_connection_get_success_data(struct tls_connection *conn); 604 605void tls_connection_remove_session(struct tls_connection *conn); 606 607#endif /* TLS_H */ 608