2 * SSL/TLS interface definition
3 * Copyright (c) 2004-2013, Jouni Malinen <j@w1.fi>
5 * This software may be distributed under the terms of the BSD license.
6 * See README for more details.
12 struct tls_connection;
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;
24 TLS_CERT_CHAIN_SUCCESS,
25 TLS_CERT_CHAIN_FAILURE,
31 * Note: These are used as identifier with external programs and as such, the
32 * values must not be changed.
34 enum tls_fail_reason {
35 TLS_FAIL_UNSPECIFIED = 0,
36 TLS_FAIL_UNTRUSTED = 1,
38 TLS_FAIL_NOT_YET_VALID = 3,
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 TLS_FAIL_DOMAIN_SUFFIX_MISMATCH = 9,
45 TLS_FAIL_SERVER_USED_CLIENT_CERT = 10
48 union tls_event_data {
52 enum tls_fail_reason reason;
53 const char *reason_txt;
54 const struct wpabuf *cert;
60 const struct wpabuf *cert;
68 const char *description;
73 const char *opensc_engine_path;
74 const char *pkcs11_engine_path;
75 const char *pkcs11_module_path;
79 void (*event_cb)(void *ctx, enum tls_event ev,
80 union tls_event_data *data);
84 #define TLS_CONN_ALLOW_SIGN_RSA_MD5 BIT(0)
85 #define TLS_CONN_DISABLE_TIME_CHECKS BIT(1)
86 #define TLS_CONN_DISABLE_SESSION_TICKET BIT(2)
87 #define TLS_CONN_REQUEST_OCSP BIT(3)
88 #define TLS_CONN_REQUIRE_OCSP BIT(4)
91 * struct tls_connection_params - Parameters for TLS connection
92 * @ca_cert: File or reference name for CA X.509 certificate in PEM or DER
94 * @ca_cert_blob: ca_cert as inlined data or %NULL if not used
95 * @ca_cert_blob_len: ca_cert_blob length
96 * @ca_path: Path to CA certificates (OpenSSL specific)
97 * @subject_match: String to match in the subject of the peer certificate or
98 * %NULL to allow all subjects
99 * @altsubject_match: String to match in the alternative subject of the peer
100 * certificate or %NULL to allow all alternative subjects
101 * @suffix_match: String to suffix match in the dNSName or CN of the peer
102 * certificate or %NULL to allow all domain names
103 * @client_cert: File or reference name for client X.509 certificate in PEM or
105 * @client_cert_blob: client_cert as inlined data or %NULL if not used
106 * @client_cert_blob_len: client_cert_blob length
107 * @private_key: File or reference name for client private key in PEM or DER
108 * format (traditional format (RSA PRIVATE KEY) or PKCS#8 (PRIVATE KEY)
109 * @private_key_blob: private_key as inlined data or %NULL if not used
110 * @private_key_blob_len: private_key_blob length
111 * @private_key_passwd: Passphrase for decrypted private key, %NULL if no
112 * passphrase is used.
113 * @dh_file: File name for DH/DSA data in PEM format, or %NULL if not used
114 * @dh_blob: dh_file as inlined data or %NULL if not used
115 * @dh_blob_len: dh_blob length
116 * @engine: 1 = use engine (e.g., a smartcard) for private key operations
117 * (this is OpenSSL specific for now)
118 * @engine_id: engine id string (this is OpenSSL specific for now)
119 * @ppin: pointer to the pin variable in the configuration
120 * (this is OpenSSL specific for now)
121 * @key_id: the private key's id when using engine (this is OpenSSL
123 * @cert_id: the certificate's id when using engine
124 * @ca_cert_id: the CA certificate's id when using engine
125 * @flags: Parameter options (TLS_CONN_*)
126 * @ocsp_stapling_response: DER encoded file with cached OCSP stapling response
127 * or %NULL if OCSP is not enabled
129 * TLS connection parameters to be configured with tls_connection_set_params()
130 * and tls_global_set_params().
132 * Certificates and private key can be configured either as a reference name
133 * (file path or reference to certificate store) or by providing the same data
134 * as a pointer to the data in memory. Only one option will be used for each
137 struct tls_connection_params {
139 const u8 *ca_cert_blob;
140 size_t ca_cert_blob_len;
142 const char *subject_match;
143 const char *altsubject_match;
144 const char *suffix_match;
145 const char *client_cert;
146 const u8 *client_cert_blob;
147 size_t client_cert_blob_len;
148 const char *private_key;
149 const u8 *private_key_blob;
150 size_t private_key_blob_len;
151 const char *private_key_passwd;
156 /* OpenSSL specific variables */
158 const char *engine_id;
162 const char *ca_cert_id;
165 const char *ocsp_stapling_response;
170 * tls_init - Initialize TLS library
171 * @conf: Configuration data for TLS library
172 * Returns: Context data to be used as tls_ctx in calls to other functions,
173 * or %NULL on failure.
175 * Called once during program startup and once for each RSN pre-authentication
176 * session. In other words, there can be two concurrent TLS contexts. If global
177 * library initialization is needed (i.e., one that is shared between both
178 * authentication types), the TLS library wrapper should maintain a reference
179 * counter and do global initialization only when moving from 0 to 1 reference.
181 void * tls_init(const struct tls_config *conf);
184 * tls_deinit - Deinitialize TLS library
185 * @tls_ctx: TLS context data from tls_init()
187 * Called once during program shutdown and once for each RSN pre-authentication
188 * session. If global library deinitialization is needed (i.e., one that is
189 * shared between both authentication types), the TLS library wrapper should
190 * maintain a reference counter and do global deinitialization only when moving
191 * from 1 to 0 references.
193 void tls_deinit(void *tls_ctx);
196 * tls_get_errors - Process pending errors
197 * @tls_ctx: TLS context data from tls_init()
198 * Returns: Number of found error, 0 if no errors detected.
200 * Process all pending TLS errors.
202 int tls_get_errors(void *tls_ctx);
205 * tls_connection_init - Initialize a new TLS connection
206 * @tls_ctx: TLS context data from tls_init()
207 * Returns: Connection context data, conn for other function calls
209 struct tls_connection * tls_connection_init(void *tls_ctx);
212 * tls_connection_deinit - Free TLS connection data
213 * @tls_ctx: TLS context data from tls_init()
214 * @conn: Connection context data from tls_connection_init()
216 * Release all resources allocated for TLS connection.
218 void tls_connection_deinit(void *tls_ctx, struct tls_connection *conn);
221 * tls_connection_established - Has the TLS connection been completed?
222 * @tls_ctx: TLS context data from tls_init()
223 * @conn: Connection context data from tls_connection_init()
224 * Returns: 1 if TLS connection has been completed, 0 if not.
226 int tls_connection_established(void *tls_ctx, struct tls_connection *conn);
229 * tls_connection_shutdown - Shutdown TLS connection
230 * @tls_ctx: TLS context data from tls_init()
231 * @conn: Connection context data from tls_connection_init()
232 * Returns: 0 on success, -1 on failure
234 * Shutdown current TLS connection without releasing all resources. New
235 * connection can be started by using the same conn without having to call
236 * tls_connection_init() or setting certificates etc. again. The new
237 * connection should try to use session resumption.
239 int tls_connection_shutdown(void *tls_ctx, struct tls_connection *conn);
242 TLS_SET_PARAMS_ENGINE_PRV_VERIFY_FAILED = -3,
243 TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED = -2
247 * tls_connection_set_params - Set TLS connection parameters
248 * @tls_ctx: TLS context data from tls_init()
249 * @conn: Connection context data from tls_connection_init()
250 * @params: Connection parameters
251 * Returns: 0 on success, -1 on failure,
252 * TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED (-2) on possible PIN error causing
253 * PKCS#11 engine failure, or
254 * TLS_SET_PARAMS_ENGINE_PRV_VERIFY_FAILED (-3) on failure to verify the
255 * PKCS#11 engine private key.
258 tls_connection_set_params(void *tls_ctx, struct tls_connection *conn,
259 const struct tls_connection_params *params);
262 * tls_global_set_params - Set TLS parameters for all TLS connection
263 * @tls_ctx: TLS context data from tls_init()
264 * @params: Global TLS parameters
265 * Returns: 0 on success, -1 on failure,
266 * TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED (-2) on possible PIN error causing
267 * PKCS#11 engine failure, or
268 * TLS_SET_PARAMS_ENGINE_PRV_VERIFY_FAILED (-3) on failure to verify the
269 * PKCS#11 engine private key.
271 int __must_check tls_global_set_params(
272 void *tls_ctx, const struct tls_connection_params *params);
275 * tls_global_set_verify - Set global certificate verification options
276 * @tls_ctx: TLS context data from tls_init()
277 * @check_crl: 0 = do not verify CRLs, 1 = verify CRL for the user certificate,
278 * 2 = verify CRL for all certificates
279 * Returns: 0 on success, -1 on failure
281 int __must_check tls_global_set_verify(void *tls_ctx, int check_crl);
284 * tls_connection_set_verify - Set certificate verification options
285 * @tls_ctx: TLS context data from tls_init()
286 * @conn: Connection context data from tls_connection_init()
287 * @verify_peer: 1 = verify peer certificate
288 * Returns: 0 on success, -1 on failure
290 int __must_check tls_connection_set_verify(void *tls_ctx,
291 struct tls_connection *conn,
295 * tls_connection_get_keys - Get master key and random data from TLS connection
296 * @tls_ctx: TLS context data from tls_init()
297 * @conn: Connection context data from tls_connection_init()
298 * @keys: Structure of key/random data (filled on success)
299 * Returns: 0 on success, -1 on failure
301 int __must_check tls_connection_get_keys(void *tls_ctx,
302 struct tls_connection *conn,
303 struct tls_keys *keys);
306 * tls_connection_prf - Use TLS-PRF to derive keying material
307 * @tls_ctx: TLS context data from tls_init()
308 * @conn: Connection context data from tls_connection_init()
309 * @label: Label (e.g., description of the key) for PRF
310 * @server_random_first: seed is 0 = client_random|server_random,
311 * 1 = server_random|client_random
312 * @out: Buffer for output data from TLS-PRF
313 * @out_len: Length of the output buffer
314 * Returns: 0 on success, -1 on failure
316 * This function is optional to implement if tls_connection_get_keys() provides
317 * access to master secret and server/client random values. If these values are
318 * not exported from the TLS library, tls_connection_prf() is required so that
319 * further keying material can be derived from the master secret. If not
320 * implemented, the function will still need to be defined, but it can just
321 * return -1. Example implementation of this function is in tls_prf_sha1_md5()
322 * when it is called with seed set to client_random|server_random (or
323 * server_random|client_random).
325 int __must_check tls_connection_prf(void *tls_ctx,
326 struct tls_connection *conn,
328 int server_random_first,
329 u8 *out, size_t out_len);
332 * tls_connection_handshake - Process TLS handshake (client side)
333 * @tls_ctx: TLS context data from tls_init()
334 * @conn: Connection context data from tls_connection_init()
335 * @in_data: Input data from TLS server
336 * @appl_data: Pointer to application data pointer, or %NULL if dropped
337 * Returns: Output data, %NULL on failure
339 * The caller is responsible for freeing the returned output data. If the final
340 * handshake message includes application data, this is decrypted and
341 * appl_data (if not %NULL) is set to point this data. The caller is
342 * responsible for freeing appl_data.
344 * This function is used during TLS handshake. The first call is done with
345 * in_data == %NULL and the library is expected to return ClientHello packet.
346 * This packet is then send to the server and a response from server is given
347 * to TLS library by calling this function again with in_data pointing to the
348 * TLS message from the server.
350 * If the TLS handshake fails, this function may return %NULL. However, if the
351 * TLS library has a TLS alert to send out, that should be returned as the
352 * output data. In this case, tls_connection_get_failed() must return failure
355 * tls_connection_established() should return 1 once the TLS handshake has been
356 * completed successfully.
358 struct wpabuf * tls_connection_handshake(void *tls_ctx,
359 struct tls_connection *conn,
360 const struct wpabuf *in_data,
361 struct wpabuf **appl_data);
363 struct wpabuf * tls_connection_handshake2(void *tls_ctx,
364 struct tls_connection *conn,
365 const struct wpabuf *in_data,
366 struct wpabuf **appl_data,
367 int *more_data_needed);
370 * tls_connection_server_handshake - Process TLS handshake (server side)
371 * @tls_ctx: TLS context data from tls_init()
372 * @conn: Connection context data from tls_connection_init()
373 * @in_data: Input data from TLS peer
374 * @appl_data: Pointer to application data pointer, or %NULL if dropped
375 * Returns: Output data, %NULL on failure
377 * The caller is responsible for freeing the returned output data.
379 struct wpabuf * tls_connection_server_handshake(void *tls_ctx,
380 struct tls_connection *conn,
381 const struct wpabuf *in_data,
382 struct wpabuf **appl_data);
385 * tls_connection_encrypt - Encrypt data into TLS tunnel
386 * @tls_ctx: TLS context data from tls_init()
387 * @conn: Connection context data from tls_connection_init()
388 * @in_data: Plaintext data to be encrypted
389 * Returns: Encrypted TLS data or %NULL on failure
391 * This function is used after TLS handshake has been completed successfully to
392 * send data in the encrypted tunnel. The caller is responsible for freeing the
393 * returned output data.
395 struct wpabuf * tls_connection_encrypt(void *tls_ctx,
396 struct tls_connection *conn,
397 const struct wpabuf *in_data);
400 * tls_connection_decrypt - Decrypt data from TLS tunnel
401 * @tls_ctx: TLS context data from tls_init()
402 * @conn: Connection context data from tls_connection_init()
403 * @in_data: Encrypted TLS data
404 * Returns: Decrypted TLS data or %NULL on failure
406 * This function is used after TLS handshake has been completed successfully to
407 * receive data from the encrypted tunnel. The caller is responsible for
408 * freeing the returned output data.
410 struct wpabuf * tls_connection_decrypt(void *tls_ctx,
411 struct tls_connection *conn,
412 const struct wpabuf *in_data);
414 struct wpabuf * tls_connection_decrypt2(void *tls_ctx,
415 struct tls_connection *conn,
416 const struct wpabuf *in_data,
417 int *more_data_needed);
420 * tls_connection_resumed - Was session resumption used
421 * @tls_ctx: TLS context data from tls_init()
422 * @conn: Connection context data from tls_connection_init()
423 * Returns: 1 if current session used session resumption, 0 if not
425 int tls_connection_resumed(void *tls_ctx, struct tls_connection *conn);
429 TLS_CIPHER_RC4_SHA /* 0x0005 */,
430 TLS_CIPHER_AES128_SHA /* 0x002f */,
431 TLS_CIPHER_RSA_DHE_AES128_SHA /* 0x0031 */,
432 TLS_CIPHER_ANON_DH_AES128_SHA /* 0x0034 */
436 * tls_connection_set_cipher_list - Configure acceptable cipher suites
437 * @tls_ctx: TLS context data from tls_init()
438 * @conn: Connection context data from tls_connection_init()
439 * @ciphers: Zero (TLS_CIPHER_NONE) terminated list of allowed ciphers
441 * Returns: 0 on success, -1 on failure
443 int __must_check tls_connection_set_cipher_list(void *tls_ctx,
444 struct tls_connection *conn,
448 * tls_get_cipher - Get current cipher name
449 * @tls_ctx: TLS context data from tls_init()
450 * @conn: Connection context data from tls_connection_init()
451 * @buf: Buffer for the cipher name
453 * Returns: 0 on success, -1 on failure
455 * Get the name of the currently used cipher.
457 int __must_check tls_get_cipher(void *tls_ctx, struct tls_connection *conn,
458 char *buf, size_t buflen);
461 * tls_connection_enable_workaround - Enable TLS workaround options
462 * @tls_ctx: TLS context data from tls_init()
463 * @conn: Connection context data from tls_connection_init()
464 * Returns: 0 on success, -1 on failure
466 * This function is used to enable connection-specific workaround options for
467 * buffer SSL/TLS implementations.
469 int __must_check tls_connection_enable_workaround(void *tls_ctx,
470 struct tls_connection *conn);
473 * tls_connection_client_hello_ext - Set TLS extension for ClientHello
474 * @tls_ctx: TLS context data from tls_init()
475 * @conn: Connection context data from tls_connection_init()
476 * @ext_type: Extension type
477 * @data: Extension payload (%NULL to remove extension)
478 * @data_len: Extension payload length
479 * Returns: 0 on success, -1 on failure
481 int __must_check tls_connection_client_hello_ext(void *tls_ctx,
482 struct tls_connection *conn,
483 int ext_type, const u8 *data,
487 * tls_connection_get_failed - Get connection failure status
488 * @tls_ctx: TLS context data from tls_init()
489 * @conn: Connection context data from tls_connection_init()
491 * Returns >0 if connection has failed, 0 if not.
493 int tls_connection_get_failed(void *tls_ctx, struct tls_connection *conn);
496 * tls_connection_get_read_alerts - Get connection read alert status
497 * @tls_ctx: TLS context data from tls_init()
498 * @conn: Connection context data from tls_connection_init()
499 * Returns: Number of times a fatal read (remote end reported error) has
500 * happened during this connection.
502 int tls_connection_get_read_alerts(void *tls_ctx, struct tls_connection *conn);
505 * tls_connection_get_write_alerts - Get connection write alert status
506 * @tls_ctx: TLS context data from tls_init()
507 * @conn: Connection context data from tls_connection_init()
508 * Returns: Number of times a fatal write (locally detected error) has happened
509 * during this connection.
511 int tls_connection_get_write_alerts(void *tls_ctx,
512 struct tls_connection *conn);
515 * tls_connection_get_keyblock_size - Get TLS key_block size
516 * @tls_ctx: TLS context data from tls_init()
517 * @conn: Connection context data from tls_connection_init()
518 * Returns: Size of the key_block for the negotiated cipher suite or -1 on
521 int tls_connection_get_keyblock_size(void *tls_ctx,
522 struct tls_connection *conn);
525 * tls_capabilities - Get supported TLS capabilities
526 * @tls_ctx: TLS context data from tls_init()
527 * Returns: Bit field of supported TLS capabilities (TLS_CAPABILITY_*)
529 unsigned int tls_capabilities(void *tls_ctx);
531 typedef int (*tls_session_ticket_cb)
532 (void *ctx, const u8 *ticket, size_t len, const u8 *client_random,
533 const u8 *server_random, u8 *master_secret);
535 int __must_check tls_connection_set_session_ticket_cb(
536 void *tls_ctx, struct tls_connection *conn,
537 tls_session_ticket_cb cb, void *ctx);