dist/wpa/src/crypto/tls.h

   1 /*
   2  * WPA Supplicant / SSL/TLS interface definition
   3  * Copyright (c) 2004-2007, 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 id when using engine (this is OpenSSL
  67  * specific for now)
  68  * @cert_id: the certificate's id when using engine
  69  * @ca_cert_id: the CA certificate's id when using engine
  70  * @tls_ia: Whether to enable TLS/IA (for EAP-TTLSv1)
  71  *
  72  * TLS connection parameters to be configured with tls_connection_set_params()
  73  * and tls_global_set_params().
  74  *
  75  * Certificates and private key can be configured either as a reference name
  76  * (file path or reference to certificate store) or by providing the same data
  77  * as a pointer to the data in memory. Only one option will be used for each
  78  * field.
  79  */
  80 struct tls_connection_params {
  81         const char *ca_cert;
  82         const u8 *ca_cert_blob;
  83         size_t ca_cert_blob_len;
  84         const char *ca_path;
  85         const char *subject_match;
  86         const char *altsubject_match;
  87         const char *client_cert;
  88         const u8 *client_cert_blob;
  89         size_t client_cert_blob_len;
  90         const char *private_key;
  91         const u8 *private_key_blob;
  92         size_t private_key_blob_len;
  93         const char *private_key_passwd;
  94         const char *dh_file;
  95         const u8 *dh_blob;
  96         size_t dh_blob_len;
  97         int tls_ia;
  98
  99         /* OpenSSL specific variables */
 100         int engine;
 101         const char *engine_id;
 102         const char *pin;
 103         const char *key_id;
 104         const char *cert_id;
 105         const char *ca_cert_id;
 106 };
 107
 108
 109 /**
 110  * tls_init - Initialize TLS library
 111  * @conf: Configuration data for TLS library
 112  * Returns: Context data to be used as tls_ctx in calls to other functions,
 113  * or %NULL on failure.
 114  *
 115  * Called once during program startup and once for each RSN pre-authentication
 116  * session. In other words, there can be two concurrent TLS contexts. If global
 117  * library initialization is needed (i.e., one that is shared between both
 118  * authentication types), the TLS library wrapper should maintain a reference
 119  * counter and do global initialization only when moving from 0 to 1 reference.
 120  */
 121 void * tls_init(const struct tls_config *conf);
 122
 123 /**
 124  * tls_deinit - Deinitialize TLS library
 125  * @tls_ctx: TLS context data from tls_init()
 126  *
 127  * Called once during program shutdown and once for each RSN pre-authentication
 128  * session. If global library deinitialization is needed (i.e., one that is
 129  * shared between both authentication types), the TLS library wrapper should
 130  * maintain a reference counter and do global deinitialization only when moving
 131  * from 1 to 0 references.
 132  */
 133 void tls_deinit(void *tls_ctx);
 134
 135 /**
 136  * tls_get_errors - Process pending errors
 137  * @tls_ctx: TLS context data from tls_init()
 138  * Returns: Number of found error, 0 if no errors detected.
 139  *
 140  * Process all pending TLS errors.
 141  */
 142 int tls_get_errors(void *tls_ctx);
 143
 144 /**
 145  * tls_connection_init - Initialize a new TLS connection
 146  * @tls_ctx: TLS context data from tls_init()
 147  * Returns: Connection context data, conn for other function calls
 148  */
 149 struct tls_connection * tls_connection_init(void *tls_ctx);
 150
 151 /**
 152  * tls_connection_deinit - Free TLS connection data
 153  * @tls_ctx: TLS context data from tls_init()
 154  * @conn: Connection context data from tls_connection_init()
 155  *
 156  * Release all resources allocated for TLS connection.
 157  */
 158 void tls_connection_deinit(void *tls_ctx, struct tls_connection *conn);
 159
 160 /**
 161  * tls_connection_established - Has the TLS connection been completed?
 162  * @tls_ctx: TLS context data from tls_init()
 163  * @conn: Connection context data from tls_connection_init()
 164  * Returns: 1 if TLS connection has been completed, 0 if not.
 165  */
 166 int tls_connection_established(void *tls_ctx, struct tls_connection *conn);
 167
 168 /**
 169  * tls_connection_shutdown - Shutdown TLS connection
 170  * @tls_ctx: TLS context data from tls_init()
 171  * @conn: Connection context data from tls_connection_init()
 172  * Returns: 0 on success, -1 on failure
 173  *
 174  * Shutdown current TLS connection without releasing all resources. New
 175  * connection can be started by using the same conn without having to call
 176  * tls_connection_init() or setting certificates etc. again. The new
 177  * connection should try to use session resumption.
 178  */
 179 int tls_connection_shutdown(void *tls_ctx, struct tls_connection *conn);
 180
 181 enum {
 182         TLS_SET_PARAMS_ENGINE_PRV_VERIFY_FAILED = -3,
 183         TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED = -2
 184 };
 185
 186 /**
 187  * tls_connection_set_params - Set TLS connection parameters
 188  * @tls_ctx: TLS context data from tls_init()
 189  * @conn: Connection context data from tls_connection_init()
 190  * @params: Connection parameters
 191  * Returns: 0 on success, -1 on failure,
 192  * TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED (-2) on possible PIN error causing
 193  * PKCS#11 engine failure, or
 194  * TLS_SET_PARAMS_ENGINE_PRV_VERIFY_FAILED (-3) on failure to verify the
 195  * PKCS#11 engine private key.
 196  */
 197 int __must_check
 198 tls_connection_set_params(void *tls_ctx, struct tls_connection *conn,
 199                           const struct tls_connection_params *params);
 200
 201 /**
 202  * tls_global_set_params - Set TLS parameters for all TLS connection
 203  * @tls_ctx: TLS context data from tls_init()
 204  * @params: Global TLS parameters
 205  * Returns: 0 on success, -1 on failure,
 206  * TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED (-2) on possible PIN error causing
 207  * PKCS#11 engine failure, or
 208  * TLS_SET_PARAMS_ENGINE_PRV_VERIFY_FAILED (-3) on failure to verify the
 209  * PKCS#11 engine private key.
 210  */
 211 int __must_check tls_global_set_params(
 212         void *tls_ctx, const struct tls_connection_params *params);
 213
 214 /**
 215  * tls_global_set_verify - Set global certificate verification options
 216  * @tls_ctx: TLS context data from tls_init()
 217  * @check_crl: 0 = do not verify CRLs, 1 = verify CRL for the user certificate,
 218  * 2 = verify CRL for all certificates
 219  * Returns: 0 on success, -1 on failure
 220  */
 221 int __must_check tls_global_set_verify(void *tls_ctx, int check_crl);
 222
 223 /**
 224  * tls_connection_set_verify - Set certificate verification options
 225  * @tls_ctx: TLS context data from tls_init()
 226  * @conn: Connection context data from tls_connection_init()
 227  * @verify_peer: 1 = verify peer certificate
 228  * Returns: 0 on success, -1 on failure
 229  */
 230 int __must_check tls_connection_set_verify(void *tls_ctx,
 231                                            struct tls_connection *conn,
 232                                            int verify_peer);
 233
 234 /**
 235  * tls_connection_set_ia - Set TLS/IA parameters
 236  * @tls_ctx: TLS context data from tls_init()
 237  * @conn: Connection context data from tls_connection_init()
 238  * @tls_ia: 1 = enable TLS/IA
 239  * Returns: 0 on success, -1 on failure
 240  *
 241  * This function is used to configure TLS/IA in server mode where
 242  * tls_connection_set_params() is not used.
 243  */
 244 int __must_check tls_connection_set_ia(void *tls_ctx,
 245                                        struct tls_connection *conn,
 246                                        int tls_ia);
 247
 248 /**
 249  * tls_connection_get_keys - Get master key and random data from TLS connection
 250  * @tls_ctx: TLS context data from tls_init()
 251  * @conn: Connection context data from tls_connection_init()
 252  * @keys: Structure of key/random data (filled on success)
 253  * Returns: 0 on success, -1 on failure
 254  */
 255 int __must_check tls_connection_get_keys(void *tls_ctx,
 256                                          struct tls_connection *conn,
 257                                          struct tls_keys *keys);
 258
 259 /**
 260  * tls_connection_prf - Use TLS-PRF to derive keying material
 261  * @tls_ctx: TLS context data from tls_init()
 262  * @conn: Connection context data from tls_connection_init()
 263  * @label: Label (e.g., description of the key) for PRF
 264  * @server_random_first: seed is 0 = client_random|server_random,
 265  * 1 = server_random|client_random
 266  * @out: Buffer for output data from TLS-PRF
 267  * @out_len: Length of the output buffer
 268  * Returns: 0 on success, -1 on failure
 269  *
 270  * This function is optional to implement if tls_connection_get_keys() provides
 271  * access to master secret and server/client random values. If these values are
 272  * not exported from the TLS library, tls_connection_prf() is required so that
 273  * further keying material can be derived from the master secret. If not
 274  * implemented, the function will still need to be defined, but it can just
 275  * return -1. Example implementation of this function is in tls_prf() function
 276  * when it is called with seed set to client_random|server_random (or
 277  * server_random|client_random).
 278  */
 279 int __must_check  tls_connection_prf(void *tls_ctx,
 280                                      struct tls_connection *conn,
 281                                      const char *label,
 282                                      int server_random_first,
 283                                      u8 *out, size_t out_len);
 284
 285 /**
 286  * tls_connection_handshake - Process TLS handshake (client side)
 287  * @tls_ctx: TLS context data from tls_init()
 288  * @conn: Connection context data from tls_connection_init()
 289  * @in_data: Input data from TLS peer
 290  * @in_len: Input data length
 291  * @out_len: Length of the output buffer.
 292  * @appl_data: Pointer to application data pointer, or %NULL if dropped
 293  * @appl_data_len: Pointer to variable that is set to appl_data length
 294  * Returns: Pointer to output data, %NULL on failure
 295  *
 296  * Caller is responsible for freeing returned output data. If the final
 297  * handshake message includes application data, this is decrypted and
 298  * appl_data (if not %NULL) is set to point this data. Caller is responsible
 299  * for freeing appl_data.
 300  *
 301  * This function is used during TLS handshake. The first call is done with
 302  * in_data == %NULL and the library is expected to return ClientHello packet.
 303  * This packet is then send to the server and a response from server is given
 304  * to TLS library by calling this function again with in_data pointing to the
 305  * TLS message from the server.
 306  *
 307  * If the TLS handshake fails, this function may return %NULL. However, if the
 308  * TLS library has a TLS alert to send out, that should be returned as the
 309  * output data. In this case, tls_connection_get_failed() must return failure
 310  * (> 0).
 311  *
 312  * tls_connection_established() should return 1 once the TLS handshake has been
 313  * completed successfully.
 314  */
 315 u8 * tls_connection_handshake(void *tls_ctx, struct tls_connection *conn,
 316                               const u8 *in_data, size_t in_len,
 317                               size_t *out_len, u8 **appl_data,
 318                               size_t *appl_data_len);
 319
 320 /**
 321  * tls_connection_server_handshake - Process TLS handshake (server side)
 322  * @tls_ctx: TLS context data from tls_init()
 323  * @conn: Connection context data from tls_connection_init()
 324  * @in_data: Input data from TLS peer
 325  * @in_len: Input data length
 326  * @out_len: Length of the output buffer.
 327  * Returns: pointer to output data, %NULL on failure
 328  *
 329  * Caller is responsible for freeing returned output data.
 330  */
 331 u8 * tls_connection_server_handshake(void *tls_ctx,
 332                                      struct tls_connection *conn,
 333                                      const u8 *in_data, size_t in_len,
 334                                      size_t *out_len);
 335
 336 /**
 337  * tls_connection_encrypt - Encrypt data into TLS tunnel
 338  * @tls_ctx: TLS context data from tls_init()
 339  * @conn: Connection context data from tls_connection_init()
 340  * @in_data: Pointer to plaintext data to be encrypted
 341  * @in_len: Input buffer length
 342  * @out_data: Pointer to output buffer (encrypted TLS data)
 343  * @out_len: Maximum out_data length
 344  * Returns: Number of bytes written to out_data, -1 on failure
 345  *
 346  * This function is used after TLS handshake has been completed successfully to
 347  * send data in the encrypted tunnel.
 348  */
 349 int __must_check tls_connection_encrypt(void *tls_ctx,
 350                                         struct tls_connection *conn,
 351                                         const u8 *in_data, size_t in_len,
 352                                         u8 *out_data, size_t out_len);
 353
 354 /**
 355  * tls_connection_decrypt - Decrypt data from TLS tunnel
 356  * @tls_ctx: TLS context data from tls_init()
 357  * @conn: Connection context data from tls_connection_init()
 358  * @in_data: Pointer to input buffer (encrypted TLS data)
 359  * @in_len: Input buffer length
 360  * @out_data: Pointer to output buffer (decrypted data from TLS tunnel)
 361  * @out_len: Maximum out_data length
 362  * Returns: Number of bytes written to out_data, -1 on failure
 363  *
 364  * This function is used after TLS handshake has been completed successfully to
 365  * receive data from the encrypted tunnel.
 366  */
 367 int __must_check tls_connection_decrypt(void *tls_ctx,
 368                                         struct tls_connection *conn,
 369                                         const u8 *in_data, size_t in_len,
 370                                         u8 *out_data, size_t out_len);
 371
 372 /**
 373  * tls_connection_resumed - Was session resumption used
 374  * @tls_ctx: TLS context data from tls_init()
 375  * @conn: Connection context data from tls_connection_init()
 376  * Returns: 1 if current session used session resumption, 0 if not
 377  */
 378 int tls_connection_resumed(void *tls_ctx, struct tls_connection *conn);
 379
 380 enum {
 381         TLS_CIPHER_NONE,
 382         TLS_CIPHER_RC4_SHA /* 0x0005 */,
 383         TLS_CIPHER_AES128_SHA /* 0x002f */,
 384         TLS_CIPHER_RSA_DHE_AES128_SHA /* 0x0031 */,
 385         TLS_CIPHER_ANON_DH_AES128_SHA /* 0x0034 */
 386 };
 387
 388 /**
 389  * tls_connection_set_cipher_list - Configure acceptable cipher suites
 390  * @tls_ctx: TLS context data from tls_init()
 391  * @conn: Connection context data from tls_connection_init()
 392  * @ciphers: Zero (TLS_CIPHER_NONE) terminated list of allowed ciphers
 393  * (TLS_CIPHER_*).
 394  * Returns: 0 on success, -1 on failure
 395  */
 396 int __must_check tls_connection_set_cipher_list(void *tls_ctx,
 397                                                 struct tls_connection *conn,
 398                                                 u8 *ciphers);
 399
 400 /**
 401  * tls_get_cipher - Get current cipher name
 402  * @tls_ctx: TLS context data from tls_init()
 403  * @conn: Connection context data from tls_connection_init()
 404  * @buf: Buffer for the cipher name
 405  * @buflen: buf size
 406  * Returns: 0 on success, -1 on failure
 407  *
 408  * Get the name of the currently used cipher.
 409  */
 410 int __must_check tls_get_cipher(void *tls_ctx, struct tls_connection *conn,
 411                                 char *buf, size_t buflen);
 412
 413 /**
 414  * tls_connection_enable_workaround - Enable TLS workaround options
 415  * @tls_ctx: TLS context data from tls_init()
 416  * @conn: Connection context data from tls_connection_init()
 417  * Returns: 0 on success, -1 on failure
 418  *
 419  * This function is used to enable connection-specific workaround options for
 420  * buffer SSL/TLS implementations.
 421  */
 422 int __must_check tls_connection_enable_workaround(void *tls_ctx,
 423                                                   struct tls_connection *conn);
 424
 425 /**
 426  * tls_connection_client_hello_ext - Set TLS extension for ClientHello
 427  * @tls_ctx: TLS context data from tls_init()
 428  * @conn: Connection context data from tls_connection_init()
 429  * @ext_type: Extension type
 430  * @data: Extension payload (%NULL to remove extension)
 431  * @data_len: Extension payload length
 432  * Returns: 0 on success, -1 on failure
 433  */
 434 int __must_check tls_connection_client_hello_ext(void *tls_ctx,
 435                                                  struct tls_connection *conn,
 436                                                  int ext_type, const u8 *data,
 437                                                  size_t data_len);
 438
 439 /**
 440  * tls_connection_get_failed - Get connection failure status
 441  * @tls_ctx: TLS context data from tls_init()
 442  * @conn: Connection context data from tls_connection_init()
 443  *
 444  * Returns >0 if connection has failed, 0 if not.
 445  */
 446 int tls_connection_get_failed(void *tls_ctx, struct tls_connection *conn);
 447
 448 /**
 449  * tls_connection_get_read_alerts - Get connection read alert status
 450  * @tls_ctx: TLS context data from tls_init()
 451  * @conn: Connection context data from tls_connection_init()
 452  * Returns: Number of times a fatal read (remote end reported error) has
 453  * happened during this connection.
 454  */
 455 int tls_connection_get_read_alerts(void *tls_ctx, struct tls_connection *conn);
 456
 457 /**
 458  * tls_connection_get_write_alerts - Get connection write alert status
 459  * @tls_ctx: TLS context data from tls_init()
 460  * @conn: Connection context data from tls_connection_init()
 461  * Returns: Number of times a fatal write (locally detected error) has happened
 462  * during this connection.
 463  */
 464 int tls_connection_get_write_alerts(void *tls_ctx,
 465                                     struct tls_connection *conn);
 466
 467 /**
 468  * tls_connection_get_keyblock_size - Get TLS key_block size
 469  * @tls_ctx: TLS context data from tls_init()
 470  * @conn: Connection context data from tls_connection_init()
 471  * Returns: Size of the key_block for the negotiated cipher suite or -1 on
 472  * failure
 473  */
 474 int tls_connection_get_keyblock_size(void *tls_ctx,
 475                                      struct tls_connection *conn);
 476
 477 #define TLS_CAPABILITY_IA 0x0001 /* TLS Inner Application (TLS/IA) */
 478 /**
 479  * tls_capabilities - Get supported TLS capabilities
 480  * @tls_ctx: TLS context data from tls_init()
 481  * Returns: Bit field of supported TLS capabilities (TLS_CAPABILITY_*)
 482  */
 483 unsigned int tls_capabilities(void *tls_ctx);
 484
 485 /**
 486  * tls_connection_ia_send_phase_finished - Send a TLS/IA PhaseFinished message
 487  * @tls_ctx: TLS context data from tls_init()
 488  * @conn: Connection context data from tls_connection_init()
 489  * @final: 1 = FinalPhaseFinished, 0 = IntermediatePhaseFinished
 490  * @out_data: Pointer to output buffer (encrypted TLS/IA data)
 491  * @out_len: Maximum out_data length
 492  * Returns: Number of bytes written to out_data on success, -1 on failure
 493  *
 494  * This function is used to send the TLS/IA end phase message, e.g., when the
 495  * EAP server completes EAP-TTLSv1.
 496  */
 497 int __must_check tls_connection_ia_send_phase_finished(
 498         void *tls_ctx, struct tls_connection *conn, int final,
 499         u8 *out_data, size_t out_len);
 500
 501 /**
 502  * tls_connection_ia_final_phase_finished - Has final phase been completed
 503  * @tls_ctx: TLS context data from tls_init()
 504  * @conn: Connection context data from tls_connection_init()
 505  * Returns: 1 if valid FinalPhaseFinished has been received, 0 if not, or -1
 506  * on failure
 507  */
 508 int __must_check tls_connection_ia_final_phase_finished(
 509         void *tls_ctx, struct tls_connection *conn);
 510
 511 /**
 512  * tls_connection_ia_permute_inner_secret - Permute TLS/IA inner secret
 513  * @tls_ctx: TLS context data from tls_init()
 514  * @conn: Connection context data from tls_connection_init()
 515  * @key: Session key material (session_key vectors with 2-octet length), or
 516  * %NULL if no session key was generating in the current phase
 517  * @key_len: Length of session key material
 518  * Returns: 0 on success, -1 on failure
 519  */
 520 int __must_check tls_connection_ia_permute_inner_secret(
 521         void *tls_ctx, struct tls_connection *conn,
 522         const u8 *key, size_t key_len);
 523
 524 typedef int (*tls_session_ticket_cb)
 525 (void *ctx, const u8 *ticket, size_t len, const u8 *client_random,
 526  const u8 *server_random, u8 *master_secret);
 527
 528 int __must_check  tls_connection_set_session_ticket_cb(
 529         void *tls_ctx, struct tls_connection *conn,
 530         tls_session_ticket_cb cb, void *ctx);
 531
 532 #endif /* TLS_H */