1 /* 2 * SSL/TLS interface definition 3 * Copyright (c) 2004-2010, 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_keys { 15 const u8 *master_key; /* TLS master secret */ 16 size_t master_key_len; 17 const u8 *client_random; 18 size_t client_random_len; 19 const u8 *server_random; 20 size_t server_random_len; 21 }; 22 23 enum tls_event { 24 TLS_CERT_CHAIN_SUCCESS, 25 TLS_CERT_CHAIN_FAILURE, 26 TLS_PEER_CERTIFICATE, 27 TLS_ALERT 28 }; 29 30 /* 31 * Note: These are used as identifier with external programs and as such, the 32 * values must not be changed. 33 */ 34 enum tls_fail_reason { 35 TLS_FAIL_UNSPECIFIED = 0, 36 TLS_FAIL_UNTRUSTED = 1, 37 TLS_FAIL_REVOKED = 2, 38 TLS_FAIL_NOT_YET_VALID = 3, 39 TLS_FAIL_EXPIRED = 4, 40 TLS_FAIL_SUBJECT_MISMATCH = 5, 41 TLS_FAIL_ALTSUBJECT_MISMATCH = 6, 42 TLS_FAIL_BAD_CERTIFICATE = 7, 43 TLS_FAIL_SERVER_CHAIN_PROBE = 8 44 }; 45 46 union tls_event_data { 47 struct { 48 int depth; 49 const char *subject; 50 enum tls_fail_reason reason; 51 const char *reason_txt; 52 const struct wpabuf *cert; 53 } cert_fail; 54 55 struct { 56 int depth; 57 const char *subject; 58 const struct wpabuf *cert; 59 const u8 *hash; 60 size_t hash_len; 61 } peer_cert; 62 63 struct { 64 int is_local; 65 const char *type; 66 const char *description; 67 } alert; 68 }; 69 70 struct tls_config { 71 const char *opensc_engine_path; 72 const char *pkcs11_engine_path; 73 const char *pkcs11_module_path; 74 int fips_mode; 75 int cert_in_cb; 76 77 void (*event_cb)(void *ctx, enum tls_event ev, 78 union tls_event_data *data); 79 void *cb_ctx; 80 }; 81 82 #define TLS_CONN_ALLOW_SIGN_RSA_MD5 BIT(0) 83 #define TLS_CONN_DISABLE_TIME_CHECKS BIT(1) 84 #define TLS_CONN_DISABLE_SESSION_TICKET BIT(2) 85 86 /** 87 * struct tls_connection_params - Parameters for TLS connection 88 * @ca_cert: File or reference name for CA X.509 certificate in PEM or DER 89 * format 90 * @ca_cert_blob: ca_cert as inlined data or %NULL if not used 91 * @ca_cert_blob_len: ca_cert_blob length 92 * @ca_path: Path to CA certificates (OpenSSL specific) 93 * @subject_match: String to match in the subject of the peer certificate or 94 * %NULL to allow all subjects 95 * @altsubject_match: String to match in the alternative subject of the peer 96 * certificate or %NULL to allow all alternative subjects 97 * @client_cert: File or reference name for client X.509 certificate in PEM or 98 * DER format 99 * @client_cert_blob: client_cert as inlined data or %NULL if not used 100 * @client_cert_blob_len: client_cert_blob length 101 * @private_key: File or reference name for client private key in PEM or DER 102 * format (traditional format (RSA PRIVATE KEY) or PKCS#8 (PRIVATE KEY) 103 * @private_key_blob: private_key as inlined data or %NULL if not used 104 * @private_key_blob_len: private_key_blob length 105 * @private_key_passwd: Passphrase for decrypted private key, %NULL if no 106 * passphrase is used. 107 * @dh_file: File name for DH/DSA data in PEM format, or %NULL if not used 108 * @dh_blob: dh_file as inlined data or %NULL if not used 109 * @dh_blob_len: dh_blob length 110 * @engine: 1 = use engine (e.g., a smartcard) for private key operations 111 * (this is OpenSSL specific for now) 112 * @engine_id: engine id string (this is OpenSSL specific for now) 113 * @ppin: pointer to the pin variable in the configuration 114 * (this is OpenSSL specific for now) 115 * @key_id: the private key's id when using engine (this is OpenSSL 116 * specific for now) 117 * @cert_id: the certificate's id when using engine 118 * @ca_cert_id: the CA certificate's id when using engine 119 * @flags: Parameter options (TLS_CONN_*) 120 * 121 * TLS connection parameters to be configured with tls_connection_set_params() 122 * and tls_global_set_params(). 123 * 124 * Certificates and private key can be configured either as a reference name 125 * (file path or reference to certificate store) or by providing the same data 126 * as a pointer to the data in memory. Only one option will be used for each 127 * field. 128 */ 129 struct tls_connection_params { 130 const char *ca_cert; 131 const u8 *ca_cert_blob; 132 size_t ca_cert_blob_len; 133 const char *ca_path; 134 const char *subject_match; 135 const char *altsubject_match; 136 const char *client_cert; 137 const u8 *client_cert_blob; 138 size_t client_cert_blob_len; 139 const char *private_key; 140 const u8 *private_key_blob; 141 size_t private_key_blob_len; 142 const char *private_key_passwd; 143 const char *dh_file; 144 const u8 *dh_blob; 145 size_t dh_blob_len; 146 147 /* OpenSSL specific variables */ 148 int engine; 149 const char *engine_id; 150 const char *pin; 151 const char *key_id; 152 const char *cert_id; 153 const char *ca_cert_id; 154 155 unsigned int flags; 156 }; 157 158 159 /** 160 * tls_init - Initialize TLS library 161 * @conf: Configuration data for TLS library 162 * Returns: Context data to be used as tls_ctx in calls to other functions, 163 * or %NULL on failure. 164 * 165 * Called once during program startup and once for each RSN pre-authentication 166 * session. In other words, there can be two concurrent TLS contexts. If global 167 * library initialization is needed (i.e., one that is shared between both 168 * authentication types), the TLS library wrapper should maintain a reference 169 * counter and do global initialization only when moving from 0 to 1 reference. 170 */ 171 void * tls_init(const struct tls_config *conf); 172 173 /** 174 * tls_deinit - Deinitialize TLS library 175 * @tls_ctx: TLS context data from tls_init() 176 * 177 * Called once during program shutdown and once for each RSN pre-authentication 178 * session. If global library deinitialization is needed (i.e., one that is 179 * shared between both authentication types), the TLS library wrapper should 180 * maintain a reference counter and do global deinitialization only when moving 181 * from 1 to 0 references. 182 */ 183 void tls_deinit(void *tls_ctx); 184 185 /** 186 * tls_get_errors - Process pending errors 187 * @tls_ctx: TLS context data from tls_init() 188 * Returns: Number of found error, 0 if no errors detected. 189 * 190 * Process all pending TLS errors. 191 */ 192 int tls_get_errors(void *tls_ctx); 193 194 /** 195 * tls_connection_init - Initialize a new TLS connection 196 * @tls_ctx: TLS context data from tls_init() 197 * Returns: Connection context data, conn for other function calls 198 */ 199 struct tls_connection * tls_connection_init(void *tls_ctx); 200 201 /** 202 * tls_connection_deinit - Free TLS connection data 203 * @tls_ctx: TLS context data from tls_init() 204 * @conn: Connection context data from tls_connection_init() 205 * 206 * Release all resources allocated for TLS connection. 207 */ 208 void tls_connection_deinit(void *tls_ctx, struct tls_connection *conn); 209 210 /** 211 * tls_connection_established - Has the TLS connection been completed? 212 * @tls_ctx: TLS context data from tls_init() 213 * @conn: Connection context data from tls_connection_init() 214 * Returns: 1 if TLS connection has been completed, 0 if not. 215 */ 216 int tls_connection_established(void *tls_ctx, struct tls_connection *conn); 217 218 /** 219 * tls_connection_shutdown - Shutdown TLS connection 220 * @tls_ctx: TLS context data from tls_init() 221 * @conn: Connection context data from tls_connection_init() 222 * Returns: 0 on success, -1 on failure 223 * 224 * Shutdown current TLS connection without releasing all resources. New 225 * connection can be started by using the same conn without having to call 226 * tls_connection_init() or setting certificates etc. again. The new 227 * connection should try to use session resumption. 228 */ 229 int tls_connection_shutdown(void *tls_ctx, struct tls_connection *conn); 230 231 enum { 232 TLS_SET_PARAMS_ENGINE_PRV_VERIFY_FAILED = -3, 233 TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED = -2 234 }; 235 236 /** 237 * tls_connection_set_params - Set TLS connection parameters 238 * @tls_ctx: TLS context data from tls_init() 239 * @conn: Connection context data from tls_connection_init() 240 * @params: Connection parameters 241 * Returns: 0 on success, -1 on failure, 242 * TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED (-2) on possible PIN error causing 243 * PKCS#11 engine failure, or 244 * TLS_SET_PARAMS_ENGINE_PRV_VERIFY_FAILED (-3) on failure to verify the 245 * PKCS#11 engine private key. 246 */ 247 int __must_check 248 tls_connection_set_params(void *tls_ctx, struct tls_connection *conn, 249 const struct tls_connection_params *params); 250 251 /** 252 * tls_global_set_params - Set TLS parameters for all TLS connection 253 * @tls_ctx: TLS context data from tls_init() 254 * @params: Global TLS parameters 255 * Returns: 0 on success, -1 on failure, 256 * TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED (-2) on possible PIN error causing 257 * PKCS#11 engine failure, or 258 * TLS_SET_PARAMS_ENGINE_PRV_VERIFY_FAILED (-3) on failure to verify the 259 * PKCS#11 engine private key. 260 */ 261 int __must_check tls_global_set_params( 262 void *tls_ctx, const struct tls_connection_params *params); 263 264 /** 265 * tls_global_set_verify - Set global certificate verification options 266 * @tls_ctx: TLS context data from tls_init() 267 * @check_crl: 0 = do not verify CRLs, 1 = verify CRL for the user certificate, 268 * 2 = verify CRL for all certificates 269 * Returns: 0 on success, -1 on failure 270 */ 271 int __must_check tls_global_set_verify(void *tls_ctx, int check_crl); 272 273 /** 274 * tls_connection_set_verify - Set certificate verification options 275 * @tls_ctx: TLS context data from tls_init() 276 * @conn: Connection context data from tls_connection_init() 277 * @verify_peer: 1 = verify peer certificate 278 * Returns: 0 on success, -1 on failure 279 */ 280 int __must_check tls_connection_set_verify(void *tls_ctx, 281 struct tls_connection *conn, 282 int verify_peer); 283 284 /** 285 * tls_connection_get_keys - Get master key and random data from TLS connection 286 * @tls_ctx: TLS context data from tls_init() 287 * @conn: Connection context data from tls_connection_init() 288 * @keys: Structure of key/random data (filled on success) 289 * Returns: 0 on success, -1 on failure 290 */ 291 int __must_check tls_connection_get_keys(void *tls_ctx, 292 struct tls_connection *conn, 293 struct tls_keys *keys); 294 295 /** 296 * tls_connection_prf - Use TLS-PRF to derive keying material 297 * @tls_ctx: TLS context data from tls_init() 298 * @conn: Connection context data from tls_connection_init() 299 * @label: Label (e.g., description of the key) for PRF 300 * @server_random_first: seed is 0 = client_random|server_random, 301 * 1 = server_random|client_random 302 * @out: Buffer for output data from TLS-PRF 303 * @out_len: Length of the output buffer 304 * Returns: 0 on success, -1 on failure 305 * 306 * This function is optional to implement if tls_connection_get_keys() provides 307 * access to master secret and server/client random values. If these values are 308 * not exported from the TLS library, tls_connection_prf() is required so that 309 * further keying material can be derived from the master secret. If not 310 * implemented, the function will still need to be defined, but it can just 311 * return -1. Example implementation of this function is in tls_prf_sha1_md5() 312 * when it is called with seed set to client_random|server_random (or 313 * server_random|client_random). 314 */ 315 int __must_check tls_connection_prf(void *tls_ctx, 316 struct tls_connection *conn, 317 const char *label, 318 int server_random_first, 319 u8 *out, size_t out_len); 320 321 /** 322 * tls_connection_handshake - Process TLS handshake (client side) 323 * @tls_ctx: TLS context data from tls_init() 324 * @conn: Connection context data from tls_connection_init() 325 * @in_data: Input data from TLS server 326 * @appl_data: Pointer to application data pointer, or %NULL if dropped 327 * Returns: Output data, %NULL on failure 328 * 329 * The caller is responsible for freeing the returned output data. If the final 330 * handshake message includes application data, this is decrypted and 331 * appl_data (if not %NULL) is set to point this data. The caller is 332 * responsible for freeing appl_data. 333 * 334 * This function is used during TLS handshake. The first call is done with 335 * in_data == %NULL and the library is expected to return ClientHello packet. 336 * This packet is then send to the server and a response from server is given 337 * to TLS library by calling this function again with in_data pointing to the 338 * TLS message from the server. 339 * 340 * If the TLS handshake fails, this function may return %NULL. However, if the 341 * TLS library has a TLS alert to send out, that should be returned as the 342 * output data. In this case, tls_connection_get_failed() must return failure 343 * (> 0). 344 * 345 * tls_connection_established() should return 1 once the TLS handshake has been 346 * completed successfully. 347 */ 348 struct wpabuf * tls_connection_handshake(void *tls_ctx, 349 struct tls_connection *conn, 350 const struct wpabuf *in_data, 351 struct wpabuf **appl_data); 352 353 struct wpabuf * tls_connection_handshake2(void *tls_ctx, 354 struct tls_connection *conn, 355 const struct wpabuf *in_data, 356 struct wpabuf **appl_data, 357 int *more_data_needed); 358 359 /** 360 * tls_connection_server_handshake - Process TLS handshake (server side) 361 * @tls_ctx: TLS context data from tls_init() 362 * @conn: Connection context data from tls_connection_init() 363 * @in_data: Input data from TLS peer 364 * @appl_data: Pointer to application data pointer, or %NULL if dropped 365 * Returns: Output data, %NULL on failure 366 * 367 * The caller is responsible for freeing the returned output data. 368 */ 369 struct wpabuf * tls_connection_server_handshake(void *tls_ctx, 370 struct tls_connection *conn, 371 const struct wpabuf *in_data, 372 struct wpabuf **appl_data); 373 374 /** 375 * tls_connection_encrypt - Encrypt data into TLS tunnel 376 * @tls_ctx: TLS context data from tls_init() 377 * @conn: Connection context data from tls_connection_init() 378 * @in_data: Plaintext data to be encrypted 379 * Returns: Encrypted TLS data or %NULL on failure 380 * 381 * This function is used after TLS handshake has been completed successfully to 382 * send data in the encrypted tunnel. The caller is responsible for freeing the 383 * returned output data. 384 */ 385 struct wpabuf * tls_connection_encrypt(void *tls_ctx, 386 struct tls_connection *conn, 387 const struct wpabuf *in_data); 388 389 /** 390 * tls_connection_decrypt - Decrypt data from TLS tunnel 391 * @tls_ctx: TLS context data from tls_init() 392 * @conn: Connection context data from tls_connection_init() 393 * @in_data: Encrypted TLS data 394 * Returns: Decrypted TLS data or %NULL on failure 395 * 396 * This function is used after TLS handshake has been completed successfully to 397 * receive data from the encrypted tunnel. The caller is responsible for 398 * freeing the returned output data. 399 */ 400 struct wpabuf * tls_connection_decrypt(void *tls_ctx, 401 struct tls_connection *conn, 402 const struct wpabuf *in_data); 403 404 struct wpabuf * tls_connection_decrypt2(void *tls_ctx, 405 struct tls_connection *conn, 406 const struct wpabuf *in_data, 407 int *more_data_needed); 408 409 /** 410 * tls_connection_resumed - Was session resumption used 411 * @tls_ctx: TLS context data from tls_init() 412 * @conn: Connection context data from tls_connection_init() 413 * Returns: 1 if current session used session resumption, 0 if not 414 */ 415 int tls_connection_resumed(void *tls_ctx, struct tls_connection *conn); 416 417 enum { 418 TLS_CIPHER_NONE, 419 TLS_CIPHER_RC4_SHA /* 0x0005 */, 420 TLS_CIPHER_AES128_SHA /* 0x002f */, 421 TLS_CIPHER_RSA_DHE_AES128_SHA /* 0x0031 */, 422 TLS_CIPHER_ANON_DH_AES128_SHA /* 0x0034 */ 423 }; 424 425 /** 426 * tls_connection_set_cipher_list - Configure acceptable cipher suites 427 * @tls_ctx: TLS context data from tls_init() 428 * @conn: Connection context data from tls_connection_init() 429 * @ciphers: Zero (TLS_CIPHER_NONE) terminated list of allowed ciphers 430 * (TLS_CIPHER_*). 431 * Returns: 0 on success, -1 on failure 432 */ 433 int __must_check tls_connection_set_cipher_list(void *tls_ctx, 434 struct tls_connection *conn, 435 u8 *ciphers); 436 437 /** 438 * tls_get_cipher - Get current cipher name 439 * @tls_ctx: TLS context data from tls_init() 440 * @conn: Connection context data from tls_connection_init() 441 * @buf: Buffer for the cipher name 442 * @buflen: buf size 443 * Returns: 0 on success, -1 on failure 444 * 445 * Get the name of the currently used cipher. 446 */ 447 int __must_check tls_get_cipher(void *tls_ctx, struct tls_connection *conn, 448 char *buf, size_t buflen); 449 450 /** 451 * tls_connection_enable_workaround - Enable TLS workaround options 452 * @tls_ctx: TLS context data from tls_init() 453 * @conn: Connection context data from tls_connection_init() 454 * Returns: 0 on success, -1 on failure 455 * 456 * This function is used to enable connection-specific workaround options for 457 * buffer SSL/TLS implementations. 458 */ 459 int __must_check tls_connection_enable_workaround(void *tls_ctx, 460 struct tls_connection *conn); 461 462 /** 463 * tls_connection_client_hello_ext - Set TLS extension for ClientHello 464 * @tls_ctx: TLS context data from tls_init() 465 * @conn: Connection context data from tls_connection_init() 466 * @ext_type: Extension type 467 * @data: Extension payload (%NULL to remove extension) 468 * @data_len: Extension payload length 469 * Returns: 0 on success, -1 on failure 470 */ 471 int __must_check tls_connection_client_hello_ext(void *tls_ctx, 472 struct tls_connection *conn, 473 int ext_type, const u8 *data, 474 size_t data_len); 475 476 /** 477 * tls_connection_get_failed - Get connection failure status 478 * @tls_ctx: TLS context data from tls_init() 479 * @conn: Connection context data from tls_connection_init() 480 * 481 * Returns >0 if connection has failed, 0 if not. 482 */ 483 int tls_connection_get_failed(void *tls_ctx, struct tls_connection *conn); 484 485 /** 486 * tls_connection_get_read_alerts - Get connection read alert status 487 * @tls_ctx: TLS context data from tls_init() 488 * @conn: Connection context data from tls_connection_init() 489 * Returns: Number of times a fatal read (remote end reported error) has 490 * happened during this connection. 491 */ 492 int tls_connection_get_read_alerts(void *tls_ctx, struct tls_connection *conn); 493 494 /** 495 * tls_connection_get_write_alerts - Get connection write alert status 496 * @tls_ctx: TLS context data from tls_init() 497 * @conn: Connection context data from tls_connection_init() 498 * Returns: Number of times a fatal write (locally detected error) has happened 499 * during this connection. 500 */ 501 int tls_connection_get_write_alerts(void *tls_ctx, 502 struct tls_connection *conn); 503 504 /** 505 * tls_connection_get_keyblock_size - Get TLS key_block size 506 * @tls_ctx: TLS context data from tls_init() 507 * @conn: Connection context data from tls_connection_init() 508 * Returns: Size of the key_block for the negotiated cipher suite or -1 on 509 * failure 510 */ 511 int tls_connection_get_keyblock_size(void *tls_ctx, 512 struct tls_connection *conn); 513 514 /** 515 * tls_capabilities - Get supported TLS capabilities 516 * @tls_ctx: TLS context data from tls_init() 517 * Returns: Bit field of supported TLS capabilities (TLS_CAPABILITY_*) 518 */ 519 unsigned int tls_capabilities(void *tls_ctx); 520 521 typedef int (*tls_session_ticket_cb) 522 (void *ctx, const u8 *ticket, size_t len, const u8 *client_random, 523 const u8 *server_random, u8 *master_secret); 524 525 int __must_check tls_connection_set_session_ticket_cb( 526 void *tls_ctx, struct tls_connection *conn, 527 tls_session_ticket_cb cb, void *ctx); 528 529 #endif /* TLS_H */ 530
