2 * SSL/TLS interface definition
3 * Copyright (c) 2004-2010, Jouni Malinen <j@w1.fi>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
9 * Alternatively, this software may be distributed under the terms of BSD
12 * See README and COPYING for more details.
18 struct tls_connection;
21 const u8 *master_key; /* TLS master secret */
22 size_t master_key_len;
23 const u8 *client_random;
24 size_t client_random_len;
25 const u8 *server_random;
26 size_t server_random_len;
30 TLS_CERT_CHAIN_FAILURE,
35 * Note: These are used as identifier with external programs and as such, the
36 * values must not be changed.
38 enum tls_fail_reason {
39 TLS_FAIL_UNSPECIFIED = 0,
40 TLS_FAIL_UNTRUSTED = 1,
42 TLS_FAIL_NOT_YET_VALID = 3,
44 TLS_FAIL_SUBJECT_MISMATCH = 5,
45 TLS_FAIL_ALTSUBJECT_MISMATCH = 6,
46 TLS_FAIL_BAD_CERTIFICATE = 7,
47 TLS_FAIL_SERVER_CHAIN_PROBE = 8
50 union tls_event_data {
54 enum tls_fail_reason reason;
55 const char *reason_txt;
56 const struct wpabuf *cert;
62 const struct wpabuf *cert;
69 const char *opensc_engine_path;
70 const char *pkcs11_engine_path;
71 const char *pkcs11_module_path;
75 void (*event_cb)(void *ctx, enum tls_event ev,
76 union tls_event_data *data);
80 #define TLS_CONN_ALLOW_SIGN_RSA_MD5 BIT(0)
81 #define TLS_CONN_DISABLE_TIME_CHECKS BIT(1)
84 * struct tls_connection_params - Parameters for TLS connection
85 * @ca_cert: File or reference name for CA X.509 certificate in PEM or DER
87 * @ca_cert_blob: ca_cert as inlined data or %NULL if not used
88 * @ca_cert_blob_len: ca_cert_blob length
89 * @ca_path: Path to CA certificates (OpenSSL specific)
90 * @subject_match: String to match in the subject of the peer certificate or
91 * %NULL to allow all subjects
92 * @altsubject_match: String to match in the alternative subject of the peer
93 * certificate or %NULL to allow all alternative subjects
94 * @client_cert: File or reference name for client X.509 certificate in PEM or
96 * @client_cert_blob: client_cert as inlined data or %NULL if not used
97 * @client_cert_blob_len: client_cert_blob length
98 * @private_key: File or reference name for client private key in PEM or DER
99 * format (traditional format (RSA PRIVATE KEY) or PKCS#8 (PRIVATE KEY)
100 * @private_key_blob: private_key as inlined data or %NULL if not used
101 * @private_key_blob_len: private_key_blob length
102 * @private_key_passwd: Passphrase for decrypted private key, %NULL if no
103 * passphrase is used.
104 * @dh_file: File name for DH/DSA data in PEM format, or %NULL if not used
105 * @dh_blob: dh_file as inlined data or %NULL if not used
106 * @dh_blob_len: dh_blob length
107 * @engine: 1 = use engine (e.g., a smartcard) for private key operations
108 * (this is OpenSSL specific for now)
109 * @engine_id: engine id string (this is OpenSSL specific for now)
110 * @ppin: pointer to the pin variable in the configuration
111 * (this is OpenSSL specific for now)
112 * @key_id: the private key's id when using engine (this is OpenSSL
114 * @cert_id: the certificate's id when using engine
115 * @ca_cert_id: the CA certificate's id when using engine
116 * @flags: Parameter options (TLS_CONN_*)
118 * TLS connection parameters to be configured with tls_connection_set_params()
119 * and tls_global_set_params().
121 * Certificates and private key can be configured either as a reference name
122 * (file path or reference to certificate store) or by providing the same data
123 * as a pointer to the data in memory. Only one option will be used for each
126 struct tls_connection_params {
128 const u8 *ca_cert_blob;
129 size_t ca_cert_blob_len;
131 const char *subject_match;
132 const char *altsubject_match;
133 const char *client_cert;
134 const u8 *client_cert_blob;
135 size_t client_cert_blob_len;
136 const char *private_key;
137 const u8 *private_key_blob;
138 size_t private_key_blob_len;
139 const char *private_key_passwd;
144 /* OpenSSL specific variables */
146 const char *engine_id;
150 const char *ca_cert_id;
157 * tls_init - Initialize TLS library
158 * @conf: Configuration data for TLS library
159 * Returns: Context data to be used as tls_ctx in calls to other functions,
160 * or %NULL on failure.
162 * Called once during program startup and once for each RSN pre-authentication
163 * session. In other words, there can be two concurrent TLS contexts. If global
164 * library initialization is needed (i.e., one that is shared between both
165 * authentication types), the TLS library wrapper should maintain a reference
166 * counter and do global initialization only when moving from 0 to 1 reference.
168 void * tls_init(const struct tls_config *conf);
171 * tls_deinit - Deinitialize TLS library
172 * @tls_ctx: TLS context data from tls_init()
174 * Called once during program shutdown and once for each RSN pre-authentication
175 * session. If global library deinitialization is needed (i.e., one that is
176 * shared between both authentication types), the TLS library wrapper should
177 * maintain a reference counter and do global deinitialization only when moving
178 * from 1 to 0 references.
180 void tls_deinit(void *tls_ctx);
183 * tls_get_errors - Process pending errors
184 * @tls_ctx: TLS context data from tls_init()
185 * Returns: Number of found error, 0 if no errors detected.
187 * Process all pending TLS errors.
189 int tls_get_errors(void *tls_ctx);
192 * tls_connection_init - Initialize a new TLS connection
193 * @tls_ctx: TLS context data from tls_init()
194 * Returns: Connection context data, conn for other function calls
196 struct tls_connection * tls_connection_init(void *tls_ctx);
199 * tls_connection_deinit - Free TLS connection data
200 * @tls_ctx: TLS context data from tls_init()
201 * @conn: Connection context data from tls_connection_init()
203 * Release all resources allocated for TLS connection.
205 void tls_connection_deinit(void *tls_ctx, struct tls_connection *conn);
208 * tls_connection_established - Has the TLS connection been completed?
209 * @tls_ctx: TLS context data from tls_init()
210 * @conn: Connection context data from tls_connection_init()
211 * Returns: 1 if TLS connection has been completed, 0 if not.
213 int tls_connection_established(void *tls_ctx, struct tls_connection *conn);
216 * tls_connection_shutdown - Shutdown TLS connection
217 * @tls_ctx: TLS context data from tls_init()
218 * @conn: Connection context data from tls_connection_init()
219 * Returns: 0 on success, -1 on failure
221 * Shutdown current TLS connection without releasing all resources. New
222 * connection can be started by using the same conn without having to call
223 * tls_connection_init() or setting certificates etc. again. The new
224 * connection should try to use session resumption.
226 int tls_connection_shutdown(void *tls_ctx, struct tls_connection *conn);
229 TLS_SET_PARAMS_ENGINE_PRV_VERIFY_FAILED = -3,
230 TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED = -2
234 * tls_connection_set_params - Set TLS connection parameters
235 * @tls_ctx: TLS context data from tls_init()
236 * @conn: Connection context data from tls_connection_init()
237 * @params: Connection parameters
238 * Returns: 0 on success, -1 on failure,
239 * TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED (-2) on possible PIN error causing
240 * PKCS#11 engine failure, or
241 * TLS_SET_PARAMS_ENGINE_PRV_VERIFY_FAILED (-3) on failure to verify the
242 * PKCS#11 engine private key.
245 tls_connection_set_params(void *tls_ctx, struct tls_connection *conn,
246 const struct tls_connection_params *params);
249 * tls_global_set_params - Set TLS parameters for all TLS connection
250 * @tls_ctx: TLS context data from tls_init()
251 * @params: Global TLS parameters
252 * Returns: 0 on success, -1 on failure,
253 * TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED (-2) on possible PIN error causing
254 * PKCS#11 engine failure, or
255 * TLS_SET_PARAMS_ENGINE_PRV_VERIFY_FAILED (-3) on failure to verify the
256 * PKCS#11 engine private key.
258 int __must_check tls_global_set_params(
259 void *tls_ctx, const struct tls_connection_params *params);
262 * tls_global_set_verify - Set global certificate verification options
263 * @tls_ctx: TLS context data from tls_init()
264 * @check_crl: 0 = do not verify CRLs, 1 = verify CRL for the user certificate,
265 * 2 = verify CRL for all certificates
266 * Returns: 0 on success, -1 on failure
268 int __must_check tls_global_set_verify(void *tls_ctx, int check_crl);
271 * tls_connection_set_verify - Set certificate verification options
272 * @tls_ctx: TLS context data from tls_init()
273 * @conn: Connection context data from tls_connection_init()
274 * @verify_peer: 1 = verify peer certificate
275 * Returns: 0 on success, -1 on failure
277 int __must_check tls_connection_set_verify(void *tls_ctx,
278 struct tls_connection *conn,
282 * tls_connection_get_keys - Get master key and random data from TLS connection
283 * @tls_ctx: TLS context data from tls_init()
284 * @conn: Connection context data from tls_connection_init()
285 * @keys: Structure of key/random data (filled on success)
286 * Returns: 0 on success, -1 on failure
288 int __must_check tls_connection_get_keys(void *tls_ctx,
289 struct tls_connection *conn,
290 struct tls_keys *keys);
293 * tls_connection_prf - Use TLS-PRF to derive keying material
294 * @tls_ctx: TLS context data from tls_init()
295 * @conn: Connection context data from tls_connection_init()
296 * @label: Label (e.g., description of the key) for PRF
297 * @server_random_first: seed is 0 = client_random|server_random,
298 * 1 = server_random|client_random
299 * @out: Buffer for output data from TLS-PRF
300 * @out_len: Length of the output buffer
301 * Returns: 0 on success, -1 on failure
303 * This function is optional to implement if tls_connection_get_keys() provides
304 * access to master secret and server/client random values. If these values are
305 * not exported from the TLS library, tls_connection_prf() is required so that
306 * further keying material can be derived from the master secret. If not
307 * implemented, the function will still need to be defined, but it can just
308 * return -1. Example implementation of this function is in tls_prf() function
309 * when it is called with seed set to client_random|server_random (or
310 * server_random|client_random).
312 int __must_check tls_connection_prf(void *tls_ctx,
313 struct tls_connection *conn,
315 int server_random_first,
316 u8 *out, size_t out_len);
319 * tls_connection_handshake - Process TLS handshake (client side)
320 * @tls_ctx: TLS context data from tls_init()
321 * @conn: Connection context data from tls_connection_init()
322 * @in_data: Input data from TLS server
323 * @appl_data: Pointer to application data pointer, or %NULL if dropped
324 * Returns: Output data, %NULL on failure
326 * The caller is responsible for freeing the returned output data. If the final
327 * handshake message includes application data, this is decrypted and
328 * appl_data (if not %NULL) is set to point this data. The caller is
329 * responsible for freeing appl_data.
331 * This function is used during TLS handshake. The first call is done with
332 * in_data == %NULL and the library is expected to return ClientHello packet.
333 * This packet is then send to the server and a response from server is given
334 * to TLS library by calling this function again with in_data pointing to the
335 * TLS message from the server.
337 * If the TLS handshake fails, this function may return %NULL. However, if the
338 * TLS library has a TLS alert to send out, that should be returned as the
339 * output data. In this case, tls_connection_get_failed() must return failure
342 * tls_connection_established() should return 1 once the TLS handshake has been
343 * completed successfully.
345 struct wpabuf * tls_connection_handshake(void *tls_ctx,
346 struct tls_connection *conn,
347 const struct wpabuf *in_data,
348 struct wpabuf **appl_data);
351 * tls_connection_server_handshake - Process TLS handshake (server side)
352 * @tls_ctx: TLS context data from tls_init()
353 * @conn: Connection context data from tls_connection_init()
354 * @in_data: Input data from TLS peer
355 * @appl_data: Pointer to application data pointer, or %NULL if dropped
356 * Returns: Output data, %NULL on failure
358 * The caller is responsible for freeing the returned output data.
360 struct wpabuf * tls_connection_server_handshake(void *tls_ctx,
361 struct tls_connection *conn,
362 const struct wpabuf *in_data,
363 struct wpabuf **appl_data);
366 * tls_connection_encrypt - Encrypt data into TLS tunnel
367 * @tls_ctx: TLS context data from tls_init()
368 * @conn: Connection context data from tls_connection_init()
369 * @in_data: Plaintext data to be encrypted
370 * Returns: Encrypted TLS data or %NULL on failure
372 * This function is used after TLS handshake has been completed successfully to
373 * send data in the encrypted tunnel. The caller is responsible for freeing the
374 * returned output data.
376 struct wpabuf * tls_connection_encrypt(void *tls_ctx,
377 struct tls_connection *conn,
378 const struct wpabuf *in_data);
381 * tls_connection_decrypt - Decrypt data from TLS tunnel
382 * @tls_ctx: TLS context data from tls_init()
383 * @conn: Connection context data from tls_connection_init()
384 * @in_data: Encrypted TLS data
385 * Returns: Decrypted TLS data or %NULL on failure
387 * This function is used after TLS handshake has been completed successfully to
388 * receive data from the encrypted tunnel. The caller is responsible for
389 * freeing the returned output data.
391 struct wpabuf * tls_connection_decrypt(void *tls_ctx,
392 struct tls_connection *conn,
393 const struct wpabuf *in_data);
396 * tls_connection_resumed - Was session resumption used
397 * @tls_ctx: TLS context data from tls_init()
398 * @conn: Connection context data from tls_connection_init()
399 * Returns: 1 if current session used session resumption, 0 if not
401 int tls_connection_resumed(void *tls_ctx, struct tls_connection *conn);
405 TLS_CIPHER_RC4_SHA /* 0x0005 */,
406 TLS_CIPHER_AES128_SHA /* 0x002f */,
407 TLS_CIPHER_RSA_DHE_AES128_SHA /* 0x0031 */,
408 TLS_CIPHER_ANON_DH_AES128_SHA /* 0x0034 */
412 * tls_connection_set_cipher_list - Configure acceptable cipher suites
413 * @tls_ctx: TLS context data from tls_init()
414 * @conn: Connection context data from tls_connection_init()
415 * @ciphers: Zero (TLS_CIPHER_NONE) terminated list of allowed ciphers
417 * Returns: 0 on success, -1 on failure
419 int __must_check tls_connection_set_cipher_list(void *tls_ctx,
420 struct tls_connection *conn,
424 * tls_get_cipher - Get current cipher name
425 * @tls_ctx: TLS context data from tls_init()
426 * @conn: Connection context data from tls_connection_init()
427 * @buf: Buffer for the cipher name
429 * Returns: 0 on success, -1 on failure
431 * Get the name of the currently used cipher.
433 int __must_check tls_get_cipher(void *tls_ctx, struct tls_connection *conn,
434 char *buf, size_t buflen);
437 * tls_connection_enable_workaround - Enable TLS workaround options
438 * @tls_ctx: TLS context data from tls_init()
439 * @conn: Connection context data from tls_connection_init()
440 * Returns: 0 on success, -1 on failure
442 * This function is used to enable connection-specific workaround options for
443 * buffer SSL/TLS implementations.
445 int __must_check tls_connection_enable_workaround(void *tls_ctx,
446 struct tls_connection *conn);
449 * tls_connection_client_hello_ext - Set TLS extension for ClientHello
450 * @tls_ctx: TLS context data from tls_init()
451 * @conn: Connection context data from tls_connection_init()
452 * @ext_type: Extension type
453 * @data: Extension payload (%NULL to remove extension)
454 * @data_len: Extension payload length
455 * Returns: 0 on success, -1 on failure
457 int __must_check tls_connection_client_hello_ext(void *tls_ctx,
458 struct tls_connection *conn,
459 int ext_type, const u8 *data,
463 * tls_connection_get_failed - Get connection failure status
464 * @tls_ctx: TLS context data from tls_init()
465 * @conn: Connection context data from tls_connection_init()
467 * Returns >0 if connection has failed, 0 if not.
469 int tls_connection_get_failed(void *tls_ctx, struct tls_connection *conn);
472 * tls_connection_get_read_alerts - Get connection read alert status
473 * @tls_ctx: TLS context data from tls_init()
474 * @conn: Connection context data from tls_connection_init()
475 * Returns: Number of times a fatal read (remote end reported error) has
476 * happened during this connection.
478 int tls_connection_get_read_alerts(void *tls_ctx, struct tls_connection *conn);
481 * tls_connection_get_write_alerts - Get connection write alert status
482 * @tls_ctx: TLS context data from tls_init()
483 * @conn: Connection context data from tls_connection_init()
484 * Returns: Number of times a fatal write (locally detected error) has happened
485 * during this connection.
487 int tls_connection_get_write_alerts(void *tls_ctx,
488 struct tls_connection *conn);
491 * tls_connection_get_keyblock_size - Get TLS key_block size
492 * @tls_ctx: TLS context data from tls_init()
493 * @conn: Connection context data from tls_connection_init()
494 * Returns: Size of the key_block for the negotiated cipher suite or -1 on
497 int tls_connection_get_keyblock_size(void *tls_ctx,
498 struct tls_connection *conn);
501 * tls_capabilities - Get supported TLS capabilities
502 * @tls_ctx: TLS context data from tls_init()
503 * Returns: Bit field of supported TLS capabilities (TLS_CAPABILITY_*)
505 unsigned int tls_capabilities(void *tls_ctx);
507 typedef int (*tls_session_ticket_cb)
508 (void *ctx, const u8 *ticket, size_t len, const u8 *client_random,
509 const u8 *server_random, u8 *master_secret);
511 int __must_check tls_connection_set_session_ticket_cb(
512 void *tls_ctx, struct tls_connection *conn,
513 tls_session_ticket_cb cb, void *ctx);