contrib/hostapd-0.5.8/tls.h

   1 /*
   2  * WPA Supplicant / SSL/TLS interface definition
   3  * Copyright (c) 2004-2006, Jouni Malinen <j@w1.fi>
   4  *
   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.
   8  *
   9  * Alternatively, this software may be distributed under the terms of BSD
  10  * license.
  11  *
  12  * See README and COPYING for more details.
  13  */
  14
  15 #ifndef TLS_H
  16 #define TLS_H
  17
  18 struct tls_connection;
  19
  20 struct tls_keys {
  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;
  27         const u8 *inner_secret; /* TLS/IA inner secret */
  28         size_t inner_secret_len;
  29 };
  30
  31 struct tls_config {
  32         const char *opensc_engine_path;
  33         const char *pkcs11_engine_path;
  34         const char *pkcs11_module_path;
  35 };
  36
  37 /**
  38  * struct tls_connection_params - Parameters for TLS connection
  39  * @ca_cert: File or reference name for CA X.509 certificate in PEM or DER
  40  * format
  41  * @ca_cert_blob: ca_cert as inlined data or %NULL if not used
  42  * @ca_cert_blob_len: ca_cert_blob length
  43  * @ca_path: Path to CA certificates (OpenSSL specific)
  44  * @subject_match: String to match in the subject of the peer certificate or
  45  * %NULL to allow all subjects
  46  * @altsubject_match: String to match in the alternative subject of the peer
  47  * certificate or %NULL to allow all alternative subjects
  48  * @client_cert: File or reference name for client X.509 certificate in PEM or
  49  * DER format
  50  * @client_cert_blob: client_cert as inlined data or %NULL if not used
  51  * @client_cert_blob_len: client_cert_blob length
  52  * @private_key: File or reference name for client private key in PEM or DER
  53  * format (traditional format (RSA PRIVATE KEY) or PKCS#8 (PRIVATE KEY)
  54  * @private_key_blob: private_key as inlined data or %NULL if not used
  55  * @private_key_blob_len: private_key_blob length
  56  * @private_key_passwd: Passphrase for decrypted private key, %NULL if no
  57  * passphrase is used.
  58  * @dh_file: File name for DH/DSA data in PEM format, or %NULL if not used
  59  * @dh_blob: dh_file as inlined data or %NULL if not used
  60  * @dh_blob_len: dh_blob length
  61  * @engine: 1 = use engine (e.g., a smartcard) for private key operations
  62  * (this is OpenSSL specific for now)
  63  * @engine_id: engine id string (this is OpenSSL specific for now)
  64  * @ppin: pointer to the pin variable in the configuration
  65  * (this is OpenSSL specific for now)
  66  * @key_id: the private key's key id (this is OpenSSL specific for now)
  67  * @tls_ia: Whether to enable TLS/IA (for EAP-TTLSv1)
  68  *
  69  * TLS connection parameters to be configured with tls_connection_set_params()
  70  * and tls_global_set_params().
  71  *
  72  * Certificates and private key can be configured either as a reference name
  73  * (file path or reference to certificate store) or by providing the same data
  74  * as a pointer to the data in memory. Only one option will be used for each
  75  * field.
  76  */
  77 struct tls_connection_params {
  78         const char *ca_cert;
  79         const u8 *ca_cert_blob;
  80         size_t ca_cert_blob_len;
  81         const char *ca_path;
  82         const char *subject_match;
  83         const char *altsubject_match;
  84         const char *client_cert;
  85         const u8 *client_cert_blob;
  86         size_t client_cert_blob_len;
  87         const char *private_key;
  88         const u8 *private_key_blob;
  89         size_t private_key_blob_len;
  90         const char *private_key_passwd;
  91         const char *dh_file;
  92         const u8 *dh_blob;
  93         size_t dh_blob_len;
  94         int tls_ia;
  95
  96         /* OpenSSL specific variables */
  97         int engine;
  98         const char *engine_id;
  99         const char *pin;
 100         const char *key_id;
 101 };
 102
 103
 104 /**
 105  * tls_init - Initialize TLS library
 106  * @conf: Configuration data for TLS library
 107  * Returns: Context data to be used as tls_ctx in calls to other functions,
 108  * or %NULL on failure.
 109  *
 110  * Called once during program startup and once for each RSN pre-authentication
 111  * session. In other words, there can be two concurrent TLS contexts. If global
 112  * library initialization is needed (i.e., one that is shared between both
 113  * authentication types), the TLS library wrapper should maintain a reference
 114  * counter and do global initialization only when moving from 0 to 1 reference.
 115  */
 116 void * tls_init(const struct tls_config *conf);
 117
 118 /**
 119  * tls_deinit - Deinitialize TLS library
 120  * @tls_ctx: TLS context data from tls_init()
 121  *
 122  * Called once during program shutdown and once for each RSN pre-authentication
 123  * session. If global library deinitialization is needed (i.e., one that is
 124  * shared between both authentication types), the TLS library wrapper should
 125  * maintain a reference counter and do global deinitialization only when moving
 126  * from 1 to 0 references.
 127  */
 128 void tls_deinit(void *tls_ctx);
 129
 130 /**
 131  * tls_get_errors - Process pending errors
 132  * @tls_ctx: TLS context data from tls_init()
 133  * Returns: Number of found error, 0 if no errors detected.
 134  *
 135  * Process all pending TLS errors.
 136  */
 137 int tls_get_errors(void *tls_ctx);
 138
 139 /**
 140  * tls_connection_init - Initialize a new TLS connection
 141  * @tls_ctx: TLS context data from tls_init()
 142  * Returns: Connection context data, conn for other function calls
 143  */
 144 struct tls_connection * tls_connection_init(void *tls_ctx);
 145
 146 /**
 147  * tls_connection_deinit - Free TLS connection data
 148  * @tls_ctx: TLS context data from tls_init()
 149  * @conn: Connection context data from tls_connection_init()
 150  *
 151  * Release all resources allocated for TLS connection.
 152  */
 153 void tls_connection_deinit(void *tls_ctx, struct tls_connection *conn);
 154
 155 /**
 156  * tls_connection_established - Has the TLS connection been completed?
 157  * @tls_ctx: TLS context data from tls_init()
 158  * @conn: Connection context data from tls_connection_init()
 159  * Returns: 1 if TLS connection has been completed, 0 if not.
 160  */
 161 int tls_connection_established(void *tls_ctx, struct tls_connection *conn);
 162
 163 /**
 164  * tls_connection_shutdown - Shutdown TLS connection
 165  * @tls_ctx: TLS context data from tls_init()
 166  * @conn: Connection context data from tls_connection_init()
 167  * Returns: 0 on success, -1 on failure
 168  *
 169  * Shutdown current TLS connection without releasing all resources. New
 170  * connection can be started by using the same conn without having to call
 171  * tls_connection_init() or setting certificates etc. again. The new
 172  * connection should try to use session resumption.
 173  */
 174 int tls_connection_shutdown(void *tls_ctx, struct tls_connection *conn);
 175
 176 enum {
 177         TLS_SET_PARAMS_ENGINE_PRV_VERIFY_FAILED = -3,
 178         TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED = -2
 179 };
 180
 181 /**
 182  * tls_connection_set_params - Set TLS connection parameters
 183  * @tls_ctx: TLS context data from tls_init()
 184  * @conn: Connection context data from tls_connection_init()
 185  * @params: Connection parameters
 186  * Returns: 0 on success, -1 on failure,
 187  * TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED (-2) on possible PIN error causing
 188  * PKCS#11 engine failure, or
 189  * TLS_SET_PARAMS_ENGINE_PRV_VERIFY_FAILED (-3) on failure to verify the
 190  * PKCS#11 engine private key.
 191  */
 192 int tls_connection_set_params(void *tls_ctx, struct tls_connection *conn,
 193                               const struct tls_connection_params *params);
 194
 195 /**
 196  * tls_global_set_params - Set TLS parameters for all TLS connection
 197  * @tls_ctx: TLS context data from tls_init()
 198  * @params: Global TLS parameters
 199  * Returns: 0 on success, -1 on failure,
 200  * TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED (-2) on possible PIN error causing
 201  * PKCS#11 engine failure, or
 202  * TLS_SET_PARAMS_ENGINE_PRV_VERIFY_FAILED (-3) on failure to verify the
 203  * PKCS#11 engine private key.
 204  */
 205 int tls_global_set_params(void *tls_ctx,
 206                           const struct tls_connection_params *params);
 207
 208 /**
 209  * tls_global_set_verify - Set global certificate verification options
 210  * @tls_ctx: TLS context data from tls_init()
 211  * @check_crl: 0 = do not verify CRLs, 1 = verify CRL for the user certificate,
 212  * 2 = verify CRL for all certificates
 213  * Returns: 0 on success, -1 on failure
 214  */
 215 int tls_global_set_verify(void *tls_ctx, int check_crl);
 216
 217 /**
 218  * tls_connection_set_verify - Set certificate verification options
 219  * @tls_ctx: TLS context data from tls_init()
 220  * @conn: Connection context data from tls_connection_init()
 221  * @verify_peer: 1 = verify peer certificate
 222  * Returns: 0 on success, -1 on failure
 223  */
 224 int tls_connection_set_verify(void *tls_ctx, struct tls_connection *conn,
 225                               int verify_peer);
 226
 227 /**
 228  * tls_connection_set_ia - Set TLS/IA parameters
 229  * @tls_ctx: TLS context data from tls_init()
 230  * @conn: Connection context data from tls_connection_init()
 231  * @tls_ia: 1 = enable TLS/IA
 232  * Returns: 0 on success, -1 on failure
 233  *
 234  * This function is used to configure TLS/IA in server mode where
 235  * tls_connection_set_params() is not used.
 236  */
 237 int tls_connection_set_ia(void *tls_ctx, struct tls_connection *conn,
 238                           int tls_ia);
 239
 240 /**
 241  * tls_connection_get_keys - Get master key and random data from TLS connection
 242  * @tls_ctx: TLS context data from tls_init()
 243  * @conn: Connection context data from tls_connection_init()
 244  * @keys: Structure of key/random data (filled on success)
 245  * Returns: 0 on success, -1 on failure
 246  */
 247 int tls_connection_get_keys(void *tls_ctx, struct tls_connection *conn,
 248                             struct tls_keys *keys);
 249
 250 /**
 251  * tls_connection_prf - Use TLS-PRF to derive keying material
 252  * @tls_ctx: TLS context data from tls_init()
 253  * @conn: Connection context data from tls_connection_init()
 254  * @label: Label (e.g., description of the key) for PRF
 255  * @server_random_first: seed is 0 = client_random|server_random,
 256  * 1 = server_random|client_random
 257  * @out: Buffer for output data from TLS-PRF
 258  * @out_len: Length of the output buffer
 259  * Returns: 0 on success, -1 on failure
 260  *
 261  * This function is optional to implement if tls_connection_get_keys() provides
 262  * access to master secret and server/client random values. If these values are
 263  * not exported from the TLS library, tls_connection_prf() is required so that
 264  * further keying material can be derived from the master secret. If not
 265  * implemented, the function will still need to be defined, but it can just
 266  * return -1. Example implementation of this function is in tls_prf() function
 267  * when it is called with seed set to client_random|server_random (or
 268  * server_random|client_random).
 269  */
 270 int tls_connection_prf(void *tls_ctx, struct tls_connection *conn,
 271                        const char *label, int server_random_first,
 272                        u8 *out, size_t out_len);
 273
 274 /**
 275  * tls_connection_handshake - Process TLS handshake (client side)
 276  * @tls_ctx: TLS context data from tls_init()
 277  * @conn: Connection context data from tls_connection_init()
 278  * @in_data: Input data from TLS peer
 279  * @in_len: Input data length
 280  * @out_len: Length of the output buffer.
 281  * @appl_data: Pointer to application data pointer, or %NULL if dropped
 282  * @appl_data_len: Pointer to variable that is set to appl_data length
 283  * Returns: Pointer to output data, %NULL on failure
 284  *
 285  * Caller is responsible for freeing returned output data. If the final
 286  * handshake message includes application data, this is decrypted and
 287  * appl_data (if not %NULL) is set to point this data. Caller is responsible
 288  * for freeing appl_data.
 289  *
 290  * This function is used during TLS handshake. The first call is done with
 291  * in_data == %NULL and the library is expected to return ClientHello packet.
 292  * This packet is then send to the server and a response from server is given
 293  * to TLS library by calling this function again with in_data pointing to the
 294  * TLS message from the server.
 295  *
 296  * If the TLS handshake fails, this function may return %NULL. However, if the
 297  * TLS library has a TLS alert to send out, that should be returned as the
 298  * output data. In this case, tls_connection_get_failed() must return failure
 299  * (> 0).
 300  *
 301  * tls_connection_established() should return 1 once the TLS handshake has been
 302  * completed successfully.
 303  */
 304 u8 * tls_connection_handshake(void *tls_ctx, struct tls_connection *conn,
 305                               const u8 *in_data, size_t in_len,
 306                               size_t *out_len, u8 **appl_data,
 307                               size_t *appl_data_len);
 308
 309 /**
 310  * tls_connection_server_handshake - Process TLS handshake (server side)
 311  * @tls_ctx: TLS context data from tls_init()
 312  * @conn: Connection context data from tls_connection_init()
 313  * @in_data: Input data from TLS peer
 314  * @in_len: Input data length
 315  * @out_len: Length of the output buffer.
 316  * Returns: pointer to output data, %NULL on failure
 317  *
 318  * Caller is responsible for freeing returned output data.
 319  */
 320 u8 * tls_connection_server_handshake(void *tls_ctx,
 321                                      struct tls_connection *conn,
 322                                      const u8 *in_data, size_t in_len,
 323                                      size_t *out_len);
 324
 325 /**
 326  * tls_connection_encrypt - Encrypt data into TLS tunnel
 327  * @tls_ctx: TLS context data from tls_init()
 328  * @conn: Connection context data from tls_connection_init()
 329  * @in_data: Pointer to plaintext data to be encrypted
 330  * @in_len: Input buffer length
 331  * @out_data: Pointer to output buffer (encrypted TLS data)
 332  * @out_len: Maximum out_data length
 333  * Returns: Number of bytes written to out_data, -1 on failure
 334  *
 335  * This function is used after TLS handshake has been completed successfully to
 336  * send data in the encrypted tunnel.
 337  */
 338 int tls_connection_encrypt(void *tls_ctx, struct tls_connection *conn,
 339                            const u8 *in_data, size_t in_len,
 340                            u8 *out_data, size_t out_len);
 341
 342 /**
 343  * tls_connection_decrypt - Decrypt data from TLS tunnel
 344  * @tls_ctx: TLS context data from tls_init()
 345  * @conn: Connection context data from tls_connection_init()
 346  * @in_data: Pointer to input buffer (encrypted TLS data)
 347  * @in_len: Input buffer length
 348  * @out_data: Pointer to output buffer (decrypted data from TLS tunnel)
 349  * @out_len: Maximum out_data length
 350  * Returns: Number of bytes written to out_data, -1 on failure
 351  *
 352  * This function is used after TLS handshake has been completed successfully to
 353  * receive data from the encrypted tunnel.
 354  */
 355 int tls_connection_decrypt(void *tls_ctx, struct tls_connection *conn,
 356                            const u8 *in_data, size_t in_len,
 357                            u8 *out_data, size_t out_len);
 358
 359 /**
 360  * tls_connection_resumed - Was session resumption used
 361  * @tls_ctx: TLS context data from tls_init()
 362  * @conn: Connection context data from tls_connection_init()
 363  * Returns: 1 if current session used session resumption, 0 if not
 364  */
 365 int tls_connection_resumed(void *tls_ctx, struct tls_connection *conn);
 366
 367 /**
 368  * tls_connection_set_master_key - Configure master secret for TLS connection
 369  * @tls_ctx: TLS context data from tls_init()
 370  * @conn: Connection context data from tls_connection_init()
 371  * @key: TLS pre-master-secret
 372  * @key_len: length of key in bytes
 373  * Returns: 0 on success, -1 on failure
 374  */
 375 int tls_connection_set_master_key(void *tls_ctx, struct tls_connection *conn,
 376                                   const u8 *key, size_t key_len);
 377
 378 enum {
 379         TLS_CIPHER_NONE,
 380         TLS_CIPHER_RC4_SHA /* 0x0005 */,
 381         TLS_CIPHER_AES128_SHA /* 0x002f */,
 382         TLS_CIPHER_RSA_DHE_AES128_SHA /* 0x0031 */,
 383         TLS_CIPHER_ANON_DH_AES128_SHA /* 0x0034 */
 384 };
 385
 386 /**
 387  * tls_connection_set_cipher_list - Configure acceptable cipher suites
 388  * @tls_ctx: TLS context data from tls_init()
 389  * @conn: Connection context data from tls_connection_init()
 390  * @ciphers: Zero (TLS_CIPHER_NONE) terminated list of allowed ciphers
 391  * (TLS_CIPHER_*).
 392  * Returns: 0 on success, -1 on failure
 393  */
 394 int tls_connection_set_cipher_list(void *tls_ctx, struct tls_connection *conn,
 395                                    u8 *ciphers);
 396
 397 /**
 398  * tls_get_cipher - Get current cipher name
 399  * @tls_ctx: TLS context data from tls_init()
 400  * @conn: Connection context data from tls_connection_init()
 401  * @buf: Buffer for the cipher name
 402  * @buflen: buf size
 403  * Returns: 0 on success, -1 on failure
 404  *
 405  * Get the name of the currently used cipher.
 406  */
 407 int tls_get_cipher(void *tls_ctx, struct tls_connection *conn,
 408                    char *buf, size_t buflen);
 409
 410 /**
 411  * tls_connection_enable_workaround - Enable TLS workaround options
 412  * @tls_ctx: TLS context data from tls_init()
 413  * @conn: Connection context data from tls_connection_init()
 414  * Returns: 0 on success, -1 on failure
 415  *
 416  * This function is used to enable connection-specific workaround options for
 417  * buffer SSL/TLS implementations.
 418  */
 419 int tls_connection_enable_workaround(void *tls_ctx,
 420                                      struct tls_connection *conn);
 421
 422 /**
 423  * tls_connection_client_hello_ext - Set TLS extension for ClientHello
 424  * @tls_ctx: TLS context data from tls_init()
 425  * @conn: Connection context data from tls_connection_init()
 426  * @ext_type: Extension type
 427  * @data: Extension payload (%NULL to remove extension)
 428  * @data_len: Extension payload length
 429  * Returns: 0 on success, -1 on failure
 430  */
 431 int tls_connection_client_hello_ext(void *tls_ctx, struct tls_connection *conn,
 432                                     int ext_type, const u8 *data,
 433                                     size_t data_len);
 434
 435 /**
 436  * tls_connection_get_failed - Get connection failure status
 437  * @tls_ctx: TLS context data from tls_init()
 438  * @conn: Connection context data from tls_connection_init()
 439  *
 440  * Returns >0 if connection has failed, 0 if not.
 441  */
 442 int tls_connection_get_failed(void *tls_ctx, struct tls_connection *conn);
 443
 444 /**
 445  * tls_connection_get_read_alerts - Get connection read alert status
 446  * @tls_ctx: TLS context data from tls_init()
 447  * @conn: Connection context data from tls_connection_init()
 448  * Returns: Number of times a fatal read (remote end reported error) has
 449  * happened during this connection.
 450  */
 451 int tls_connection_get_read_alerts(void *tls_ctx, struct tls_connection *conn);
 452
 453 /**
 454  * tls_connection_get_write_alerts - Get connection write alert status
 455  * @tls_ctx: TLS context data from tls_init()
 456  * @conn: Connection context data from tls_connection_init()
 457  * Returns: Number of times a fatal write (locally detected error) has happened
 458  * during this connection.
 459  */
 460 int tls_connection_get_write_alerts(void *tls_ctx,
 461                                     struct tls_connection *conn);
 462
 463 /**
 464  * tls_connection_get_keyblock_size - Get TLS key_block size
 465  * @tls_ctx: TLS context data from tls_init()
 466  * @conn: Connection context data from tls_connection_init()
 467  * Returns: Size of the key_block for the negotiated cipher suite or -1 on
 468  * failure
 469  */
 470 int tls_connection_get_keyblock_size(void *tls_ctx,
 471                                      struct tls_connection *conn);
 472
 473 #define TLS_CAPABILITY_IA 0x0001 /* TLS Inner Application (TLS/IA) */
 474 /**
 475  * tls_capabilities - Get supported TLS capabilities
 476  * @tls_ctx: TLS context data from tls_init()
 477  * Returns: Bit field of supported TLS capabilities (TLS_CAPABILITY_*)
 478  */
 479 unsigned int tls_capabilities(void *tls_ctx);
 480
 481 /**
 482  * tls_connection_ia_send_phase_finished - Send a TLS/IA PhaseFinished message
 483  * @tls_ctx: TLS context data from tls_init()
 484  * @conn: Connection context data from tls_connection_init()
 485  * @final: 1 = FinalPhaseFinished, 0 = IntermediatePhaseFinished
 486  * @out_data: Pointer to output buffer (encrypted TLS/IA data)
 487  * @out_len: Maximum out_data length
 488  * Returns: Number of bytes written to out_data on success, -1 on failure
 489  *
 490  * This function is used to send the TLS/IA end phase message, e.g., when the
 491  * EAP server completes EAP-TTLSv1.
 492  */
 493 int tls_connection_ia_send_phase_finished(void *tls_ctx,
 494                                           struct tls_connection *conn,
 495                                           int final,
 496                                           u8 *out_data, size_t out_len);
 497
 498 /**
 499  * tls_connection_ia_final_phase_finished - Has final phase been completed
 500  * @tls_ctx: TLS context data from tls_init()
 501  * @conn: Connection context data from tls_connection_init()
 502  * Returns: 1 if valid FinalPhaseFinished has been received, 0 if not, or -1
 503  * on failure
 504  */
 505 int tls_connection_ia_final_phase_finished(void *tls_ctx,
 506                                            struct tls_connection *conn);
 507
 508 /**
 509  * tls_connection_ia_permute_inner_secret - Permute TLS/IA inner secret
 510  * @tls_ctx: TLS context data from tls_init()
 511  * @conn: Connection context data from tls_connection_init()
 512  * @key: Session key material (session_key vectors with 2-octet length), or
 513  * %NULL if no session key was generating in the current phase
 514  * @key_len: Length of session key material
 515  * Returns: 0 on success, -1 on failure
 516  */
 517 int tls_connection_ia_permute_inner_secret(void *tls_ctx,
 518                                            struct tls_connection *conn,
 519                                            const u8 *key, size_t key_len);
 520
 521 #endif /* TLS_H */