1 /* 2 * SSL/TLS interface definition 3 * Copyright (c) 2004-2013, Jouni Malinen <j (at) 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 12 struct tls_connection; 13 14 struct 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 21 enum 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 */ 32 enum 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 }; 45 46 47 #define TLS_MAX_ALT_SUBJECT 10 48 49 union tls_event_data { 50 struct { 51 int depth; 52 const char *subject; 53 enum tls_fail_reason reason; 54 const char *reason_txt; 55 const struct wpabuf *cert; 56 } cert_fail; 57 58 struct { 59 int depth; 60 const char *subject; 61 const struct wpabuf *cert; 62 const u8 *hash; 63 size_t hash_len; 64 const char *altsubject[TLS_MAX_ALT_SUBJECT]; 65 int num_altsubject; 66 } peer_cert; 67 68 struct { 69 int is_local; 70 const char *type; 71 const char *description; 72 } alert; 73 }; 74 75 struct tls_config { 76 const char *opensc_engine_path; 77 const char *pkcs11_engine_path; 78 const char *pkcs11_module_path; 79 int fips_mode; 80 int cert_in_cb; 81 const char *openssl_ciphers; 82 unsigned int tls_session_lifetime; 83 84 void (*event_cb)(void *ctx, enum tls_event ev, 85 union tls_event_data *data); 86 void *cb_ctx; 87 }; 88 89 #define TLS_CONN_ALLOW_SIGN_RSA_MD5 BIT(0) 90 #define TLS_CONN_DISABLE_TIME_CHECKS BIT(1) 91 #define TLS_CONN_DISABLE_SESSION_TICKET BIT(2) 92 #define TLS_CONN_REQUEST_OCSP BIT(3) 93 #define TLS_CONN_REQUIRE_OCSP BIT(4) 94 #define TLS_CONN_DISABLE_TLSv1_1 BIT(5) 95 #define TLS_CONN_DISABLE_TLSv1_2 BIT(6) 96 #define TLS_CONN_EAP_FAST BIT(7) 97 #define TLS_CONN_DISABLE_TLSv1_0 BIT(8) 98 #define TLS_CONN_EXT_CERT_CHECK BIT(9) 99 #define TLS_CONN_REQUIRE_OCSP_ALL BIT(10) 100 101 /** 102 * struct tls_connection_params - Parameters for TLS connection 103 * @ca_cert: File or reference name for CA X.509 certificate in PEM or DER 104 * format 105 * @ca_cert_blob: ca_cert as inlined data or %NULL if not used 106 * @ca_cert_blob_len: ca_cert_blob length 107 * @ca_path: Path to CA certificates (OpenSSL specific) 108 * @subject_match: String to match in the subject of the peer certificate or 109 * %NULL to allow all subjects 110 * @altsubject_match: String to match in the alternative subject of the peer 111 * certificate or %NULL to allow all alternative subjects 112 * @suffix_match: String to suffix match in the dNSName or CN of the peer 113 * certificate or %NULL to allow all domain names. This may allow subdomains an 114 * wildcard certificates. Each domain name label must have a full match. 115 * @domain_match: String to match in the dNSName or CN of the peer 116 * certificate or %NULL to allow all domain names. This requires a full, 117 * case-insensitive match. 118 * @client_cert: File or reference name for client X.509 certificate in PEM or 119 * DER format 120 * @client_cert_blob: client_cert as inlined data or %NULL if not used 121 * @client_cert_blob_len: client_cert_blob length 122 * @private_key: File or reference name for client private key in PEM or DER 123 * format (traditional format (RSA PRIVATE KEY) or PKCS#8 (PRIVATE KEY) 124 * @private_key_blob: private_key as inlined data or %NULL if not used 125 * @private_key_blob_len: private_key_blob length 126 * @private_key_passwd: Passphrase for decrypted private key, %NULL if no 127 * passphrase is used. 128 * @dh_file: File name for DH/DSA data in PEM format, or %NULL if not used 129 * @dh_blob: dh_file as inlined data or %NULL if not used 130 * @dh_blob_len: dh_blob length 131 * @engine: 1 = use engine (e.g., a smartcard) for private key operations 132 * (this is OpenSSL specific for now) 133 * @engine_id: engine id string (this is OpenSSL specific for now) 134 * @ppin: pointer to the pin variable in the configuration 135 * (this is OpenSSL specific for now) 136 * @key_id: the private key's id when using engine (this is OpenSSL 137 * specific for now) 138 * @cert_id: the certificate's id when using engine 139 * @ca_cert_id: the CA certificate's id when using engine 140 * @openssl_ciphers: OpenSSL cipher configuration 141 * @flags: Parameter options (TLS_CONN_*) 142 * @ocsp_stapling_response: DER encoded file with cached OCSP stapling response 143 * or %NULL if OCSP is not enabled 144 * @ocsp_stapling_response_multi: DER encoded file with cached OCSP stapling 145 * response list (OCSPResponseList for ocsp_multi in RFC 6961) or %NULL if 146 * ocsp_multi is not enabled 147 * 148 * TLS connection parameters to be configured with tls_connection_set_params() 149 * and tls_global_set_params(). 150 * 151 * Certificates and private key can be configured either as a reference name 152 * (file path or reference to certificate store) or by providing the same data 153 * as a pointer to the data in memory. Only one option will be used for each 154 * field. 155 */ 156 struct tls_connection_params { 157 const char *ca_cert; 158 const u8 *ca_cert_blob; 159 size_t ca_cert_blob_len; 160 const char *ca_path; 161 const char *subject_match; 162 const char *altsubject_match; 163 const char *suffix_match; 164 const char *domain_match; 165 const char *client_cert; 166 const u8 *client_cert_blob; 167 size_t client_cert_blob_len; 168 const char *private_key; 169 const u8 *private_key_blob; 170 size_t private_key_blob_len; 171 const char *private_key_passwd; 172 const char *dh_file; 173 const u8 *dh_blob; 174 size_t dh_blob_len; 175 176 /* OpenSSL specific variables */ 177 int engine; 178 const char *engine_id; 179 const char *pin; 180 const char *key_id; 181 const char *cert_id; 182 const char *ca_cert_id; 183 const char *openssl_ciphers; 184 185 unsigned int flags; 186 const char *ocsp_stapling_response; 187 const char *ocsp_stapling_response_multi; 188 }; 189 190 191 /** 192 * tls_init - Initialize TLS library 193 * @conf: Configuration data for TLS library 194 * Returns: Context data to be used as tls_ctx in calls to other functions, 195 * or %NULL on failure. 196 * 197 * Called once during program startup and once for each RSN pre-authentication 198 * session. In other words, there can be two concurrent TLS contexts. If global 199 * library initialization is needed (i.e., one that is shared between both 200 * authentication types), the TLS library wrapper should maintain a reference 201 * counter and do global initialization only when moving from 0 to 1 reference. 202 */ 203 void * tls_init(const struct tls_config *conf); 204 205 /** 206 * tls_deinit - Deinitialize TLS library 207 * @tls_ctx: TLS context data from tls_init() 208 * 209 * Called once during program shutdown and once for each RSN pre-authentication 210 * session. If global library deinitialization is needed (i.e., one that is 211 * shared between both authentication types), the TLS library wrapper should 212 * maintain a reference counter and do global deinitialization only when moving 213 * from 1 to 0 references. 214 */ 215 void tls_deinit(void *tls_ctx); 216 217 /** 218 * tls_get_errors - Process pending errors 219 * @tls_ctx: TLS context data from tls_init() 220 * Returns: Number of found error, 0 if no errors detected. 221 * 222 * Process all pending TLS errors. 223 */ 224 int tls_get_errors(void *tls_ctx); 225 226 /** 227 * tls_connection_init - Initialize a new TLS connection 228 * @tls_ctx: TLS context data from tls_init() 229 * Returns: Connection context data, conn for other function calls 230 */ 231 struct tls_connection * tls_connection_init(void *tls_ctx); 232 233 /** 234 * tls_connection_deinit - Free TLS connection data 235 * @tls_ctx: TLS context data from tls_init() 236 * @conn: Connection context data from tls_connection_init() 237 * 238 * Release all resources allocated for TLS connection. 239 */ 240 void tls_connection_deinit(void *tls_ctx, struct tls_connection *conn); 241 242 /** 243 * tls_connection_established - Has the TLS connection been completed? 244 * @tls_ctx: TLS context data from tls_init() 245 * @conn: Connection context data from tls_connection_init() 246 * Returns: 1 if TLS connection has been completed, 0 if not. 247 */ 248 int tls_connection_established(void *tls_ctx, struct tls_connection *conn); 249 250 /** 251 * tls_connection_shutdown - Shutdown TLS connection 252 * @tls_ctx: TLS context data from tls_init() 253 * @conn: Connection context data from tls_connection_init() 254 * Returns: 0 on success, -1 on failure 255 * 256 * Shutdown current TLS connection without releasing all resources. New 257 * connection can be started by using the same conn without having to call 258 * tls_connection_init() or setting certificates etc. again. The new 259 * connection should try to use session resumption. 260 */ 261 int tls_connection_shutdown(void *tls_ctx, struct tls_connection *conn); 262 263 enum { 264 TLS_SET_PARAMS_ENGINE_PRV_BAD_PIN = -4, 265 TLS_SET_PARAMS_ENGINE_PRV_VERIFY_FAILED = -3, 266 TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED = -2 267 }; 268 269 /** 270 * tls_connection_set_params - Set TLS connection parameters 271 * @tls_ctx: TLS context data from tls_init() 272 * @conn: Connection context data from tls_connection_init() 273 * @params: Connection parameters 274 * Returns: 0 on success, -1 on failure, 275 * TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED (-2) on error causing PKCS#11 engine 276 * failure, or 277 * TLS_SET_PARAMS_ENGINE_PRV_VERIFY_FAILED (-3) on failure to verify the 278 * PKCS#11 engine private key, or 279 * TLS_SET_PARAMS_ENGINE_PRV_BAD_PIN (-4) on PIN error causing PKCS#11 engine 280 * failure. 281 */ 282 int __must_check 283 tls_connection_set_params(void *tls_ctx, struct tls_connection *conn, 284 const struct tls_connection_params *params); 285 286 /** 287 * tls_global_set_params - Set TLS parameters for all TLS connection 288 * @tls_ctx: TLS context data from tls_init() 289 * @params: Global TLS parameters 290 * Returns: 0 on success, -1 on failure, 291 * TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED (-2) on error causing PKCS#11 engine 292 * failure, or 293 * TLS_SET_PARAMS_ENGINE_PRV_VERIFY_FAILED (-3) on failure to verify the 294 * PKCS#11 engine private key, or 295 * TLS_SET_PARAMS_ENGINE_PRV_BAD_PIN (-4) on PIN error causing PKCS#11 engine 296 * failure. 297 */ 298 int __must_check tls_global_set_params( 299 void *tls_ctx, const struct tls_connection_params *params); 300 301 /** 302 * tls_global_set_verify - Set global certificate verification options 303 * @tls_ctx: TLS context data from tls_init() 304 * @check_crl: 0 = do not verify CRLs, 1 = verify CRL for the user certificate, 305 * 2 = verify CRL for all certificates 306 * Returns: 0 on success, -1 on failure 307 */ 308 int __must_check tls_global_set_verify(void *tls_ctx, int check_crl); 309 310 /** 311 * tls_connection_set_verify - Set certificate verification options 312 * @tls_ctx: TLS context data from tls_init() 313 * @conn: Connection context data from tls_connection_init() 314 * @verify_peer: 1 = verify peer certificate 315 * @flags: Connection flags (TLS_CONN_*) 316 * @session_ctx: Session caching context or %NULL to use default 317 * @session_ctx_len: Length of @session_ctx in bytes. 318 * Returns: 0 on success, -1 on failure 319 */ 320 int __must_check tls_connection_set_verify(void *tls_ctx, 321 struct tls_connection *conn, 322 int verify_peer, 323 unsigned int flags, 324 const u8 *session_ctx, 325 size_t session_ctx_len); 326 327 /** 328 * tls_connection_get_random - Get random data from TLS connection 329 * @tls_ctx: TLS context data from tls_init() 330 * @conn: Connection context data from tls_connection_init() 331 * @data: Structure of client/server random data (filled on success) 332 * Returns: 0 on success, -1 on failure 333 */ 334 int __must_check tls_connection_get_random(void *tls_ctx, 335 struct tls_connection *conn, 336 struct tls_random *data); 337 338 /** 339 * tls_connection_prf - Use TLS-PRF to derive keying material 340 * @tls_ctx: TLS context data from tls_init() 341 * @conn: Connection context data from tls_connection_init() 342 * @label: Label (e.g., description of the key) for PRF 343 * @server_random_first: seed is 0 = client_random|server_random, 344 * 1 = server_random|client_random 345 * @skip_keyblock: Skip TLS key block from the beginning of PRF output 346 * @out: Buffer for output data from TLS-PRF 347 * @out_len: Length of the output buffer 348 * Returns: 0 on success, -1 on failure 349 * 350 * tls_connection_prf() is required so that further keying material can be 351 * derived from the master secret. Example implementation of this function is in 352 * tls_prf_sha1_md5() when it is called with seed set to 353 * client_random|server_random (or server_random|client_random). For TLSv1.2 and 354 * newer, a different PRF is needed, though. 355 */ 356 int __must_check tls_connection_prf(void *tls_ctx, 357 struct tls_connection *conn, 358 const char *label, 359 int server_random_first, 360 int skip_keyblock, 361 u8 *out, size_t out_len); 362 363 /** 364 * tls_connection_handshake - Process TLS handshake (client side) 365 * @tls_ctx: TLS context data from tls_init() 366 * @conn: Connection context data from tls_connection_init() 367 * @in_data: Input data from TLS server 368 * @appl_data: Pointer to application data pointer, or %NULL if dropped 369 * Returns: Output data, %NULL on failure 370 * 371 * The caller is responsible for freeing the returned output data. If the final 372 * handshake message includes application data, this is decrypted and 373 * appl_data (if not %NULL) is set to point this data. The caller is 374 * responsible for freeing appl_data. 375 * 376 * This function is used during TLS handshake. The first call is done with 377 * in_data == %NULL and the library is expected to return ClientHello packet. 378 * This packet is then send to the server and a response from server is given 379 * to TLS library by calling this function again with in_data pointing to the 380 * TLS message from the server. 381 * 382 * If the TLS handshake fails, this function may return %NULL. However, if the 383 * TLS library has a TLS alert to send out, that should be returned as the 384 * output data. In this case, tls_connection_get_failed() must return failure 385 * (> 0). 386 * 387 * tls_connection_established() should return 1 once the TLS handshake has been 388 * completed successfully. 389 */ 390 struct wpabuf * tls_connection_handshake(void *tls_ctx, 391 struct tls_connection *conn, 392 const struct wpabuf *in_data, 393 struct wpabuf **appl_data); 394 395 struct wpabuf * tls_connection_handshake2(void *tls_ctx, 396 struct tls_connection *conn, 397 const struct wpabuf *in_data, 398 struct wpabuf **appl_data, 399 int *more_data_needed); 400 401 /** 402 * tls_connection_server_handshake - Process TLS handshake (server side) 403 * @tls_ctx: TLS context data from tls_init() 404 * @conn: Connection context data from tls_connection_init() 405 * @in_data: Input data from TLS peer 406 * @appl_data: Pointer to application data pointer, or %NULL if dropped 407 * Returns: Output data, %NULL on failure 408 * 409 * The caller is responsible for freeing the returned output data. 410 */ 411 struct wpabuf * tls_connection_server_handshake(void *tls_ctx, 412 struct tls_connection *conn, 413 const struct wpabuf *in_data, 414 struct wpabuf **appl_data); 415 416 /** 417 * tls_connection_encrypt - Encrypt data into TLS tunnel 418 * @tls_ctx: TLS context data from tls_init() 419 * @conn: Connection context data from tls_connection_init() 420 * @in_data: Plaintext data to be encrypted 421 * Returns: Encrypted TLS data or %NULL on failure 422 * 423 * This function is used after TLS handshake has been completed successfully to 424 * send data in the encrypted tunnel. The caller is responsible for freeing the 425 * returned output data. 426 */ 427 struct wpabuf * tls_connection_encrypt(void *tls_ctx, 428 struct tls_connection *conn, 429 const struct wpabuf *in_data); 430 431 /** 432 * tls_connection_decrypt - Decrypt data from TLS tunnel 433 * @tls_ctx: TLS context data from tls_init() 434 * @conn: Connection context data from tls_connection_init() 435 * @in_data: Encrypted TLS data 436 * Returns: Decrypted TLS data or %NULL on failure 437 * 438 * This function is used after TLS handshake has been completed successfully to 439 * receive data from the encrypted tunnel. The caller is responsible for 440 * freeing the returned output data. 441 */ 442 struct wpabuf * tls_connection_decrypt(void *tls_ctx, 443 struct tls_connection *conn, 444 const struct wpabuf *in_data); 445 446 struct wpabuf * tls_connection_decrypt2(void *tls_ctx, 447 struct tls_connection *conn, 448 const struct wpabuf *in_data, 449 int *more_data_needed); 450 451 /** 452 * tls_connection_resumed - Was session resumption used 453 * @tls_ctx: TLS context data from tls_init() 454 * @conn: Connection context data from tls_connection_init() 455 * Returns: 1 if current session used session resumption, 0 if not 456 */ 457 int tls_connection_resumed(void *tls_ctx, struct tls_connection *conn); 458 459 enum { 460 TLS_CIPHER_NONE, 461 TLS_CIPHER_RC4_SHA /* 0x0005 */, 462 TLS_CIPHER_AES128_SHA /* 0x002f */, 463 TLS_CIPHER_RSA_DHE_AES128_SHA /* 0x0031 */, 464 TLS_CIPHER_ANON_DH_AES128_SHA /* 0x0034 */, 465 TLS_CIPHER_RSA_DHE_AES256_SHA /* 0x0039 */, 466 TLS_CIPHER_AES256_SHA /* 0x0035 */, 467 }; 468 469 /** 470 * tls_connection_set_cipher_list - Configure acceptable cipher suites 471 * @tls_ctx: TLS context data from tls_init() 472 * @conn: Connection context data from tls_connection_init() 473 * @ciphers: Zero (TLS_CIPHER_NONE) terminated list of allowed ciphers 474 * (TLS_CIPHER_*). 475 * Returns: 0 on success, -1 on failure 476 */ 477 int __must_check tls_connection_set_cipher_list(void *tls_ctx, 478 struct tls_connection *conn, 479 u8 *ciphers); 480 481 /** 482 * tls_get_version - Get the current TLS version number 483 * @tls_ctx: TLS context data from tls_init() 484 * @conn: Connection context data from tls_connection_init() 485 * @buf: Buffer for returning the TLS version number 486 * @buflen: buf size 487 * Returns: 0 on success, -1 on failure 488 * 489 * Get the currently used TLS version number. 490 */ 491 int __must_check tls_get_version(void *tls_ctx, struct tls_connection *conn, 492 char *buf, size_t buflen); 493 494 /** 495 * tls_get_cipher - Get current cipher name 496 * @tls_ctx: TLS context data from tls_init() 497 * @conn: Connection context data from tls_connection_init() 498 * @buf: Buffer for the cipher name 499 * @buflen: buf size 500 * Returns: 0 on success, -1 on failure 501 * 502 * Get the name of the currently used cipher. 503 */ 504 int __must_check tls_get_cipher(void *tls_ctx, struct tls_connection *conn, 505 char *buf, size_t buflen); 506 507 /** 508 * tls_connection_enable_workaround - Enable TLS workaround options 509 * @tls_ctx: TLS context data from tls_init() 510 * @conn: Connection context data from tls_connection_init() 511 * Returns: 0 on success, -1 on failure 512 * 513 * This function is used to enable connection-specific workaround options for 514 * buffer SSL/TLS implementations. 515 */ 516 int __must_check tls_connection_enable_workaround(void *tls_ctx, 517 struct tls_connection *conn); 518 519 /** 520 * tls_connection_client_hello_ext - Set TLS extension for ClientHello 521 * @tls_ctx: TLS context data from tls_init() 522 * @conn: Connection context data from tls_connection_init() 523 * @ext_type: Extension type 524 * @data: Extension payload (%NULL to remove extension) 525 * @data_len: Extension payload length 526 * Returns: 0 on success, -1 on failure 527 */ 528 int __must_check tls_connection_client_hello_ext(void *tls_ctx, 529 struct tls_connection *conn, 530 int ext_type, const u8 *data, 531 size_t data_len); 532 533 /** 534 * tls_connection_get_failed - Get connection failure status 535 * @tls_ctx: TLS context data from tls_init() 536 * @conn: Connection context data from tls_connection_init() 537 * 538 * Returns >0 if connection has failed, 0 if not. 539 */ 540 int tls_connection_get_failed(void *tls_ctx, struct tls_connection *conn); 541 542 /** 543 * tls_connection_get_read_alerts - Get connection read alert status 544 * @tls_ctx: TLS context data from tls_init() 545 * @conn: Connection context data from tls_connection_init() 546 * Returns: Number of times a fatal read (remote end reported error) has 547 * happened during this connection. 548 */ 549 int tls_connection_get_read_alerts(void *tls_ctx, struct tls_connection *conn); 550 551 /** 552 * tls_connection_get_write_alerts - Get connection write alert status 553 * @tls_ctx: TLS context data from tls_init() 554 * @conn: Connection context data from tls_connection_init() 555 * Returns: Number of times a fatal write (locally detected error) has happened 556 * during this connection. 557 */ 558 int tls_connection_get_write_alerts(void *tls_ctx, 559 struct tls_connection *conn); 560 561 typedef int (*tls_session_ticket_cb) 562 (void *ctx, const u8 *ticket, size_t len, const u8 *client_random, 563 const u8 *server_random, u8 *master_secret); 564 565 int __must_check tls_connection_set_session_ticket_cb( 566 void *tls_ctx, struct tls_connection *conn, 567 tls_session_ticket_cb cb, void *ctx); 568 569 void tls_connection_set_log_cb(struct tls_connection *conn, 570 void (*log_cb)(void *ctx, const char *msg), 571 void *ctx); 572 573 #define TLS_BREAK_VERIFY_DATA BIT(0) 574 #define TLS_BREAK_SRV_KEY_X_HASH BIT(1) 575 #define TLS_BREAK_SRV_KEY_X_SIGNATURE BIT(2) 576 #define TLS_DHE_PRIME_511B BIT(3) 577 #define TLS_DHE_PRIME_767B BIT(4) 578 #define TLS_DHE_PRIME_15 BIT(5) 579 #define TLS_DHE_PRIME_58B BIT(6) 580 #define TLS_DHE_NON_PRIME BIT(7) 581 582 void tls_connection_set_test_flags(struct tls_connection *conn, u32 flags); 583 584 int tls_get_library_version(char *buf, size_t buf_len); 585 586 void tls_connection_set_success_data(struct tls_connection *conn, 587 struct wpabuf *data); 588 589 void tls_connection_set_success_data_resumed(struct tls_connection *conn); 590 591 const struct wpabuf * 592 tls_connection_get_success_data(struct tls_connection *conn); 593 594 void tls_connection_remove_session(struct tls_connection *conn); 595 596 #endif /* TLS_H */ 597
