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_DOMAIN_MISMATCH = 10,
49 #define TLS_MAX_ALT_SUBJECT 10
51 union tls_event_data {
55 enum tls_fail_reason reason;
56 const char *reason_txt;
57 const struct wpabuf *cert;
63 const struct wpabuf *cert;
66 const char *altsubject[TLS_MAX_ALT_SUBJECT];
73 const char *description;
78 const char *opensc_engine_path;
79 const char *pkcs11_engine_path;
80 const char *pkcs11_module_path;
83 const char *openssl_ciphers;
85 void (*event_cb)(void *ctx, enum tls_event ev,
86 union tls_event_data *data);
90 #define TLS_CONN_ALLOW_SIGN_RSA_MD5 BIT(0)
91 #define TLS_CONN_DISABLE_TIME_CHECKS BIT(1)
92 #define TLS_CONN_DISABLE_SESSION_TICKET BIT(2)
93 #define TLS_CONN_REQUEST_OCSP BIT(3)
94 #define TLS_CONN_REQUIRE_OCSP BIT(4)
95 #define TLS_CONN_DISABLE_TLSv1_1 BIT(5)
96 #define TLS_CONN_DISABLE_TLSv1_2 BIT(6)
97 #define TLS_CONN_EAP_FAST BIT(7)
100 * struct tls_connection_params - Parameters for TLS connection
101 * @ca_cert: File or reference name for CA X.509 certificate in PEM or DER
103 * @ca_cert_blob: ca_cert as inlined data or %NULL if not used
104 * @ca_cert_blob_len: ca_cert_blob length
105 * @ca_path: Path to CA certificates (OpenSSL specific)
106 * @subject_match: String to match in the subject of the peer certificate or
107 * %NULL to allow all subjects
108 * @altsubject_match: String to match in the alternative subject of the peer
109 * certificate or %NULL to allow all alternative subjects
110 * @suffix_match: String to suffix match in the dNSName or CN of the peer
111 * certificate or %NULL to allow all domain names. This may allow subdomains an
112 * wildcard certificates. Each domain name label must have a full match.
113 * @domain_match: String to match in the dNSName or CN of the peer
114 * certificate or %NULL to allow all domain names. This requires a full,
115 * case-insensitive match.
116 * @client_cert: File or reference name for client X.509 certificate in PEM or
118 * @client_cert_blob: client_cert as inlined data or %NULL if not used
119 * @client_cert_blob_len: client_cert_blob length
120 * @private_key: File or reference name for client private key in PEM or DER
121 * format (traditional format (RSA PRIVATE KEY) or PKCS#8 (PRIVATE KEY)
122 * @private_key_blob: private_key as inlined data or %NULL if not used
123 * @private_key_blob_len: private_key_blob length
124 * @private_key_passwd: Passphrase for decrypted private key, %NULL if no
125 * passphrase is used.
126 * @dh_file: File name for DH/DSA data in PEM format, or %NULL if not used
127 * @dh_blob: dh_file as inlined data or %NULL if not used
128 * @dh_blob_len: dh_blob length
129 * @engine: 1 = use engine (e.g., a smartcard) for private key operations
130 * (this is OpenSSL specific for now)
131 * @engine_id: engine id string (this is OpenSSL specific for now)
132 * @ppin: pointer to the pin variable in the configuration
133 * (this is OpenSSL specific for now)
134 * @key_id: the private key's id when using engine (this is OpenSSL
136 * @cert_id: the certificate's id when using engine
137 * @ca_cert_id: the CA certificate's id when using engine
138 * @openssl_ciphers: OpenSSL cipher configuration
139 * @flags: Parameter options (TLS_CONN_*)
140 * @ocsp_stapling_response: DER encoded file with cached OCSP stapling response
141 * or %NULL if OCSP is not enabled
143 * TLS connection parameters to be configured with tls_connection_set_params()
144 * and tls_global_set_params().
146 * Certificates and private key can be configured either as a reference name
147 * (file path or reference to certificate store) or by providing the same data
148 * as a pointer to the data in memory. Only one option will be used for each
151 struct tls_connection_params {
153 const u8 *ca_cert_blob;
154 size_t ca_cert_blob_len;
156 const char *subject_match;
157 const char *altsubject_match;
158 const char *suffix_match;
159 const char *domain_match;
160 const char *client_cert;
161 const u8 *client_cert_blob;
162 size_t client_cert_blob_len;
163 const char *private_key;
164 const u8 *private_key_blob;
165 size_t private_key_blob_len;
166 const char *private_key_passwd;
171 /* OpenSSL specific variables */
173 const char *engine_id;
177 const char *ca_cert_id;
178 const char *openssl_ciphers;
181 const char *ocsp_stapling_response;
186 * tls_init - Initialize TLS library
187 * @conf: Configuration data for TLS library
188 * Returns: Context data to be used as tls_ctx in calls to other functions,
189 * or %NULL on failure.
191 * Called once during program startup and once for each RSN pre-authentication
192 * session. In other words, there can be two concurrent TLS contexts. If global
193 * library initialization is needed (i.e., one that is shared between both
194 * authentication types), the TLS library wrapper should maintain a reference
195 * counter and do global initialization only when moving from 0 to 1 reference.
197 void * tls_init(const struct tls_config *conf);
200 * tls_deinit - Deinitialize TLS library
201 * @tls_ctx: TLS context data from tls_init()
203 * Called once during program shutdown and once for each RSN pre-authentication
204 * session. If global library deinitialization is needed (i.e., one that is
205 * shared between both authentication types), the TLS library wrapper should
206 * maintain a reference counter and do global deinitialization only when moving
207 * from 1 to 0 references.
209 void tls_deinit(void *tls_ctx);
212 * tls_get_errors - Process pending errors
213 * @tls_ctx: TLS context data from tls_init()
214 * Returns: Number of found error, 0 if no errors detected.
216 * Process all pending TLS errors.
218 int tls_get_errors(void *tls_ctx);
221 * tls_connection_init - Initialize a new TLS connection
222 * @tls_ctx: TLS context data from tls_init()
223 * Returns: Connection context data, conn for other function calls
225 struct tls_connection * tls_connection_init(void *tls_ctx);
228 * tls_connection_deinit - Free TLS connection data
229 * @tls_ctx: TLS context data from tls_init()
230 * @conn: Connection context data from tls_connection_init()
232 * Release all resources allocated for TLS connection.
234 void tls_connection_deinit(void *tls_ctx, struct tls_connection *conn);
237 * tls_connection_established - Has the TLS connection been completed?
238 * @tls_ctx: TLS context data from tls_init()
239 * @conn: Connection context data from tls_connection_init()
240 * Returns: 1 if TLS connection has been completed, 0 if not.
242 int tls_connection_established(void *tls_ctx, struct tls_connection *conn);
245 * tls_connection_shutdown - Shutdown TLS connection
246 * @tls_ctx: TLS context data from tls_init()
247 * @conn: Connection context data from tls_connection_init()
248 * Returns: 0 on success, -1 on failure
250 * Shutdown current TLS connection without releasing all resources. New
251 * connection can be started by using the same conn without having to call
252 * tls_connection_init() or setting certificates etc. again. The new
253 * connection should try to use session resumption.
255 int tls_connection_shutdown(void *tls_ctx, struct tls_connection *conn);
258 TLS_SET_PARAMS_ENGINE_PRV_VERIFY_FAILED = -3,
259 TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED = -2
263 * tls_connection_set_params - Set TLS connection parameters
264 * @tls_ctx: TLS context data from tls_init()
265 * @conn: Connection context data from tls_connection_init()
266 * @params: Connection parameters
267 * Returns: 0 on success, -1 on failure,
268 * TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED (-2) on possible PIN error causing
269 * PKCS#11 engine failure, or
270 * TLS_SET_PARAMS_ENGINE_PRV_VERIFY_FAILED (-3) on failure to verify the
271 * PKCS#11 engine private key.
274 tls_connection_set_params(void *tls_ctx, struct tls_connection *conn,
275 const struct tls_connection_params *params);
278 * tls_global_set_params - Set TLS parameters for all TLS connection
279 * @tls_ctx: TLS context data from tls_init()
280 * @params: Global TLS parameters
281 * Returns: 0 on success, -1 on failure,
282 * TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED (-2) on possible PIN error causing
283 * PKCS#11 engine failure, or
284 * TLS_SET_PARAMS_ENGINE_PRV_VERIFY_FAILED (-3) on failure to verify the
285 * PKCS#11 engine private key.
287 int __must_check tls_global_set_params(
288 void *tls_ctx, const struct tls_connection_params *params);
291 * tls_global_set_verify - Set global certificate verification options
292 * @tls_ctx: TLS context data from tls_init()
293 * @check_crl: 0 = do not verify CRLs, 1 = verify CRL for the user certificate,
294 * 2 = verify CRL for all certificates
295 * Returns: 0 on success, -1 on failure
297 int __must_check tls_global_set_verify(void *tls_ctx, int check_crl);
300 * tls_connection_set_verify - Set certificate verification options
301 * @tls_ctx: TLS context data from tls_init()
302 * @conn: Connection context data from tls_connection_init()
303 * @verify_peer: 1 = verify peer certificate
304 * Returns: 0 on success, -1 on failure
306 int __must_check tls_connection_set_verify(void *tls_ctx,
307 struct tls_connection *conn,
311 * tls_connection_get_keys - Get master key and random data from TLS connection
312 * @tls_ctx: TLS context data from tls_init()
313 * @conn: Connection context data from tls_connection_init()
314 * @keys: Structure of key/random data (filled on success)
315 * Returns: 0 on success, -1 on failure
317 int __must_check tls_connection_get_keys(void *tls_ctx,
318 struct tls_connection *conn,
319 struct tls_keys *keys);
322 * tls_connection_prf - Use TLS-PRF to derive keying material
323 * @tls_ctx: TLS context data from tls_init()
324 * @conn: Connection context data from tls_connection_init()
325 * @label: Label (e.g., description of the key) for PRF
326 * @server_random_first: seed is 0 = client_random|server_random,
327 * 1 = server_random|client_random
328 * @out: Buffer for output data from TLS-PRF
329 * @out_len: Length of the output buffer
330 * Returns: 0 on success, -1 on failure
332 * This function is optional to implement if tls_connection_get_keys() provides
333 * access to master secret and server/client random values. If these values are
334 * not exported from the TLS library, tls_connection_prf() is required so that
335 * further keying material can be derived from the master secret. If not
336 * implemented, the function will still need to be defined, but it can just
337 * return -1. Example implementation of this function is in tls_prf_sha1_md5()
338 * when it is called with seed set to client_random|server_random (or
339 * server_random|client_random).
341 int __must_check tls_connection_prf(void *tls_ctx,
342 struct tls_connection *conn,
344 int server_random_first,
345 u8 *out, size_t out_len);
348 * tls_connection_handshake - Process TLS handshake (client side)
349 * @tls_ctx: TLS context data from tls_init()
350 * @conn: Connection context data from tls_connection_init()
351 * @in_data: Input data from TLS server
352 * @appl_data: Pointer to application data pointer, or %NULL if dropped
353 * Returns: Output data, %NULL on failure
355 * The caller is responsible for freeing the returned output data. If the final
356 * handshake message includes application data, this is decrypted and
357 * appl_data (if not %NULL) is set to point this data. The caller is
358 * responsible for freeing appl_data.
360 * This function is used during TLS handshake. The first call is done with
361 * in_data == %NULL and the library is expected to return ClientHello packet.
362 * This packet is then send to the server and a response from server is given
363 * to TLS library by calling this function again with in_data pointing to the
364 * TLS message from the server.
366 * If the TLS handshake fails, this function may return %NULL. However, if the
367 * TLS library has a TLS alert to send out, that should be returned as the
368 * output data. In this case, tls_connection_get_failed() must return failure
371 * tls_connection_established() should return 1 once the TLS handshake has been
372 * completed successfully.
374 struct wpabuf * tls_connection_handshake(void *tls_ctx,
375 struct tls_connection *conn,
376 const struct wpabuf *in_data,
377 struct wpabuf **appl_data);
379 struct wpabuf * tls_connection_handshake2(void *tls_ctx,
380 struct tls_connection *conn,
381 const struct wpabuf *in_data,
382 struct wpabuf **appl_data,
383 int *more_data_needed);
386 * tls_connection_server_handshake - Process TLS handshake (server side)
387 * @tls_ctx: TLS context data from tls_init()
388 * @conn: Connection context data from tls_connection_init()
389 * @in_data: Input data from TLS peer
390 * @appl_data: Pointer to application data pointer, or %NULL if dropped
391 * Returns: Output data, %NULL on failure
393 * The caller is responsible for freeing the returned output data.
395 struct wpabuf * tls_connection_server_handshake(void *tls_ctx,
396 struct tls_connection *conn,
397 const struct wpabuf *in_data,
398 struct wpabuf **appl_data);
401 * tls_connection_encrypt - Encrypt data into TLS tunnel
402 * @tls_ctx: TLS context data from tls_init()
403 * @conn: Connection context data from tls_connection_init()
404 * @in_data: Plaintext data to be encrypted
405 * Returns: Encrypted TLS data or %NULL on failure
407 * This function is used after TLS handshake has been completed successfully to
408 * send data in the encrypted tunnel. The caller is responsible for freeing the
409 * returned output data.
411 struct wpabuf * tls_connection_encrypt(void *tls_ctx,
412 struct tls_connection *conn,
413 const struct wpabuf *in_data);
416 * tls_connection_decrypt - Decrypt data from TLS tunnel
417 * @tls_ctx: TLS context data from tls_init()
418 * @conn: Connection context data from tls_connection_init()
419 * @in_data: Encrypted TLS data
420 * Returns: Decrypted TLS data or %NULL on failure
422 * This function is used after TLS handshake has been completed successfully to
423 * receive data from the encrypted tunnel. The caller is responsible for
424 * freeing the returned output data.
426 struct wpabuf * tls_connection_decrypt(void *tls_ctx,
427 struct tls_connection *conn,
428 const struct wpabuf *in_data);
430 struct wpabuf * tls_connection_decrypt2(void *tls_ctx,
431 struct tls_connection *conn,
432 const struct wpabuf *in_data,
433 int *more_data_needed);
436 * tls_connection_resumed - Was session resumption used
437 * @tls_ctx: TLS context data from tls_init()
438 * @conn: Connection context data from tls_connection_init()
439 * Returns: 1 if current session used session resumption, 0 if not
441 int tls_connection_resumed(void *tls_ctx, struct tls_connection *conn);
445 TLS_CIPHER_RC4_SHA /* 0x0005 */,
446 TLS_CIPHER_AES128_SHA /* 0x002f */,
447 TLS_CIPHER_RSA_DHE_AES128_SHA /* 0x0031 */,
448 TLS_CIPHER_ANON_DH_AES128_SHA /* 0x0034 */
452 * tls_connection_set_cipher_list - Configure acceptable cipher suites
453 * @tls_ctx: TLS context data from tls_init()
454 * @conn: Connection context data from tls_connection_init()
455 * @ciphers: Zero (TLS_CIPHER_NONE) terminated list of allowed ciphers
457 * Returns: 0 on success, -1 on failure
459 int __must_check tls_connection_set_cipher_list(void *tls_ctx,
460 struct tls_connection *conn,
464 * tls_get_cipher - Get current cipher name
465 * @tls_ctx: TLS context data from tls_init()
466 * @conn: Connection context data from tls_connection_init()
467 * @buf: Buffer for the cipher name
469 * Returns: 0 on success, -1 on failure
471 * Get the name of the currently used cipher.
473 int __must_check tls_get_cipher(void *tls_ctx, struct tls_connection *conn,
474 char *buf, size_t buflen);
477 * tls_connection_enable_workaround - Enable TLS workaround options
478 * @tls_ctx: TLS context data from tls_init()
479 * @conn: Connection context data from tls_connection_init()
480 * Returns: 0 on success, -1 on failure
482 * This function is used to enable connection-specific workaround options for
483 * buffer SSL/TLS implementations.
485 int __must_check tls_connection_enable_workaround(void *tls_ctx,
486 struct tls_connection *conn);
489 * tls_connection_client_hello_ext - Set TLS extension for ClientHello
490 * @tls_ctx: TLS context data from tls_init()
491 * @conn: Connection context data from tls_connection_init()
492 * @ext_type: Extension type
493 * @data: Extension payload (%NULL to remove extension)
494 * @data_len: Extension payload length
495 * Returns: 0 on success, -1 on failure
497 int __must_check tls_connection_client_hello_ext(void *tls_ctx,
498 struct tls_connection *conn,
499 int ext_type, const u8 *data,
503 * tls_connection_get_failed - Get connection failure status
504 * @tls_ctx: TLS context data from tls_init()
505 * @conn: Connection context data from tls_connection_init()
507 * Returns >0 if connection has failed, 0 if not.
509 int tls_connection_get_failed(void *tls_ctx, struct tls_connection *conn);
512 * tls_connection_get_read_alerts - Get connection read alert status
513 * @tls_ctx: TLS context data from tls_init()
514 * @conn: Connection context data from tls_connection_init()
515 * Returns: Number of times a fatal read (remote end reported error) has
516 * happened during this connection.
518 int tls_connection_get_read_alerts(void *tls_ctx, struct tls_connection *conn);
521 * tls_connection_get_write_alerts - Get connection write alert status
522 * @tls_ctx: TLS context data from tls_init()
523 * @conn: Connection context data from tls_connection_init()
524 * Returns: Number of times a fatal write (locally detected error) has happened
525 * during this connection.
527 int tls_connection_get_write_alerts(void *tls_ctx,
528 struct tls_connection *conn);
531 * tls_connection_get_keyblock_size - Get TLS key_block size
532 * @tls_ctx: TLS context data from tls_init()
533 * @conn: Connection context data from tls_connection_init()
534 * Returns: Size of the key_block for the negotiated cipher suite or -1 on
537 int tls_connection_get_keyblock_size(void *tls_ctx,
538 struct tls_connection *conn);
541 * tls_capabilities - Get supported TLS capabilities
542 * @tls_ctx: TLS context data from tls_init()
543 * Returns: Bit field of supported TLS capabilities (TLS_CAPABILITY_*)
545 unsigned int tls_capabilities(void *tls_ctx);
547 typedef int (*tls_session_ticket_cb)
548 (void *ctx, const u8 *ticket, size_t len, const u8 *client_random,
549 const u8 *server_random, u8 *master_secret);
551 int __must_check tls_connection_set_session_ticket_cb(
552 void *tls_ctx, struct tls_connection *conn,
553 tls_session_ticket_cb cb, void *ctx);
555 void tls_connection_set_log_cb(struct tls_connection *conn,
556 void (*log_cb)(void *ctx, const char *msg),
559 #define TLS_BREAK_VERIFY_DATA BIT(0)
560 #define TLS_BREAK_SRV_KEY_X_HASH BIT(1)
561 #define TLS_BREAK_SRV_KEY_X_SIGNATURE BIT(2)
562 #define TLS_DHE_PRIME_511B BIT(3)
563 #define TLS_DHE_PRIME_767B BIT(4)
564 #define TLS_DHE_PRIME_15 BIT(5)
565 #define TLS_DHE_PRIME_58B BIT(6)
566 #define TLS_DHE_NON_PRIME BIT(7)
568 void tls_connection_set_test_flags(struct tls_connection *conn, u32 flags);
570 int tls_get_library_version(char *buf, size_t buf_len);