contrib/cryptsetup/lib/libcryptsetup.h

   1 #ifndef _LIBCRYPTSETUP_H
   2 #define _LIBCRYPTSETUP_H
   3 #ifdef __cplusplus
   4 extern "C" {
   5 #endif
   6
   7 #include <stdint.h>
   8
   9 struct crypt_device; /* crypt device handle */
  10
  11 /**
  12  * Initialise crypt device handle and check if provided device exists.
  13  *
  14  * Returns 0 on success or negative errno value otherwise.
  15  *
  16  * @cd - returns pointer to crypt device handle
  17  * @device - path to device
  18  *
  19  * Note that logging is not initialized here, possible messages uses
  20  * default log function.
  21  */
  22 int crypt_init(struct crypt_device **cd, const char *device);
  23
  24 /**
  25  * Initialise crypt device handle from provided active device name
  26  * and check if provided device exists.
  27  *
  28  * Returns 0 on success or negative errno value otherwise.
  29  *
  30  * @cd - crypt device handle
  31  * @name - name of active crypt device
  32  */
  33 int crypt_init_by_name(struct crypt_device **cd, const char *name);
  34
  35 /**
  36  * Set log function.
  37  *
  38  * @cd - crypt device handle (can be NULL to set default log function)
  39  * @usrptr - provided identification in callback
  40  * @level  - log level below (debug messages can uses other levels)
  41  * @msg    - log message
  42  */
  43 #define CRYPT_LOG_NORMAL 0
  44 #define CRYPT_LOG_ERROR  1
  45 #define CRYPT_LOG_VERBOSE  2
  46 #define CRYPT_LOG_DEBUG -1 /* always on stdout */
  47 void crypt_set_log_callback(struct crypt_device *cd,
  48         void (*log)(int level, const char *msg, void *usrptr),
  49         void *usrptr);
  50
  51 /**
  52  * Log message through log function.
  53  *
  54  * @cd - crypt device handle
  55  * @level  - log level
  56  * @msg    - log message
  57  */
  58 void crypt_log(struct crypt_device *cd, int level, const char *msg);
  59
  60 /**
  61  * Set confirmation callback (yes/no)
  62  *
  63  * If code need confirmation (like deleting last key slot) this function
  64  * is called. If not defined, everything is confirmed.
  65  *
  66  * Calback should return 0 if operation is declined, other values mean accepted.
  67  *
  68  * @cd - crypt device handle
  69  * @usrptr - provided identification in callback
  70  * @msg - Message for user to confirm
  71  */
  72 void crypt_set_confirm_callback(struct crypt_device *cd,
  73         int (*confirm)(const char *msg, void *usrptr),
  74         void *usrptr);
  75
  76 /**
  77  * Set password query callback.
  78  *
  79  * If code need _interactive_ query for password, this callback is called.
  80  * If not defined, compiled-in default is called (uses terminal input).
  81  *
  82  * @cd - crypt device handle
  83  * @usrptr - provided identification in callback
  84  * @msg - Message for user
  85  * @buf - buffer for password
  86  * @length - size of buffer
  87  *
  88  * - Note that if this function is defined, verify option is ignored
  89  *   (caller whch provided callback is responsible fo password verification)
  90  * - Only zero terminated passwords can be enteted this way, for complex
  91  *   API functions directly.
  92  * - Maximal length of password is limited to @length-1 (minimal 511 chars)
  93  */
  94 void crypt_set_password_callback(struct crypt_device *cd,
  95         int (*password)(const char *msg, char *buf, size_t length, void *usrptr),
  96         void *usrptr);
  97
  98 /**
  99  * Various crypt device parameters
 100  *
 101  * @cd - crypt device handle
 102  * @timeout - timeout in secons for password entry if compiled-in function used
 103  * @password_retry - number of tries for password if not verified
 104  * @iteration_time - iteration time for LUKS header in miliseconds
 105  * @password_verify - for compiled-in password query always verify passwords twice
 106  */
 107 void crypt_set_timeout(struct crypt_device *cd, uint64_t timeout_sec);
 108 void crypt_set_password_retry(struct crypt_device *cd, int tries);
 109 void crypt_set_iterarion_time(struct crypt_device *cd, uint64_t iteration_time_ms);
 110 void crypt_set_password_verify(struct crypt_device *cd, int password_verify);
 111
 112 /**
 113  * Helper to lock/unlock memory to avoid swap sensitive data to disk
 114  *
 115  * @cd - crypt device handle, can be NULL
 116  * @lock - 0 to unloct otherwise lock memory
 117  *
 118  * Return value indicates that memory is locked (function can be called multiple times).
 119  * Only root can do this. Note it locks/unlocks all process memory, not only crypt context.
 120  */
 121 int crypt_memory_lock(struct crypt_device *cd, int lock);
 122
 123 #define CRYPT_PLAIN "PLAIN" /* regular crypt device, no on-disk header */
 124 #define CRYPT_LUKS1 "LUKS1" /* LUKS version 1 header on-disk */
 125
 126 struct crypt_params_plain {
 127         const char *hash; /* password hash function */
 128         uint64_t offset;  /* offset in sectors */
 129         uint64_t skip;    /* IV initilisation sector */
 130 };
 131
 132 struct crypt_params_luks1 {
 133         const char *hash;      /* hash used in LUKS header */
 134         size_t data_alignment; /* in sectors, data offset is multiple of this */
 135 };
 136
 137 /**
 138  * Create (format) new crypt device (and possible header on-disk) but not activates it.
 139  *
 140  * Returns 0 on success or negative errno value otherwise.
 141  *
 142  * @cd - crypt device handle
 143  * @type - type of device (optional params struct must be of this type)
 144  * @cipher - (e.g. "aes")
 145  * @cipher_mode - including IV specification (e.g. "xts-plain")
 146  * @uuid - requested UUID or NULL if it should be generated
 147  * @volume_key - pre-generated volume key or NULL if it should be generated (only for LUKS)
 148  * @volume_key_size - size og volume key in bytes.
 149  * @params - crypt type specific parameters
 150  *
 151  * Note that crypt_format do not enable any keyslot, but it stores volume key internally
 152  * and subsequent crypt_keyslot_add_* calls can be used.
 153  * (It is the only situation when crypt_keyslot_add_* do not require active key slots.)
 154  */
 155 int crypt_format(struct crypt_device *cd,
 156         const char *type,
 157         const char *cipher,
 158         const char *cipher_mode,
 159         const char *uuid,
 160         const char *volume_key,
 161         size_t volume_key_size,
 162         void *params);
 163
 164 /**
 165  * Load crypt device parameters from on-disk header
 166  *
 167  * Returns 0 on success or negative errno value otherwise.
 168  *
 169  * @cd - crypt device handle
 170  * @requested_type - use NULL for all known
 171  * @params - crypt type specific parameters
 172  */
 173 int crypt_load(struct crypt_device *cd,
 174                const char *requested_type,
 175                void *params);
 176
 177 /**
 178  * Suspends crypt device.
 179  *
 180  * Returns 0 on success or negative errno value otherwise.
 181  *
 182  * @cd - crypt device handle, can be NULL
 183  * @name - name of device to suspend
 184  */
 185 int crypt_suspend(struct crypt_device *cd,
 186                   const char *name);
 187
 188 /**
 189  * Resumes crypt device using passphrase.
 190  *
 191  * Returns unlocked key slot number or negative errno otherwise.
 192  *
 193  * @cd - crypt device handle
 194  * @name - name of device to resume
 195  * @keyslot - requested keyslot or CRYPT_ANY_SLOT
 196  * @passphrase - passphrase used to unlock volume key, NULL for query
 197  * @passphrase_size - size of @passphrase (binary data)
 198  */
 199 int crypt_resume_by_passphrase(struct crypt_device *cd,
 200                                const char *name,
 201                                int keyslot,
 202                                const char *passphrase,
 203                                size_t passphrase_size);
 204
 205 /**
 206  * Resumes crypt device using key file.
 207  *
 208  * Returns unlocked key slot number or negative errno otherwise.
 209  *
 210  * @cd - crypt device handle
 211  * @name - name of device to resume
 212  * @keyslot - requested keyslot or CRYPT_ANY_SLOT
 213  * @keyfile - key file used to unlock volume key, NULL for passphrase query
 214  * @keyfile_size - number of bytes to read from @keyfile, 0 is unlimited
 215  */
 216 int crypt_resume_by_keyfile(struct crypt_device *cd,
 217                             const char *name,
 218                             int keyslot,
 219                             const char *keyfile,
 220                             size_t keyfile_size);
 221
 222 /**
 223  * Releases crypt device context and used memory.
 224  *
 225  * @cd - crypt device handle
 226  */
 227 void crypt_free(struct crypt_device *cd);
 228
 229 /**
 230  * Add key slot using provided passphrase
 231  *
 232  * Returns allocated key slot number or negative errno otherwise.
 233  *
 234  * @cd - crypt device handle
 235  * @keyslot - requested keyslot or CRYPT_ANY_SLOT
 236  * @passphrase - passphrase used to unlock volume key, NULL for query
 237  * @passphrase_size - size of @passphrase (binary data)
 238  * @new_passphrase - passphrase for new keyslot, NULL for query
 239  * @new_passphrase_size - size of @new_passphrase (binary data)
 240  */
 241 #define CRYPT_ANY_SLOT -1
 242 int crypt_keyslot_add_by_passphrase(struct crypt_device *cd,
 243         int keyslot,
 244         const char *passphrase,
 245         size_t passphrase_size,
 246         const char *new_passphrase,
 247         size_t new_passphrase_size);
 248
 249 /**
 250 * Add key slot using provided key file path
 251  *
 252  * Returns allocated key slot number or negative errno otherwise.
 253  *
 254  * @cd - crypt device handle
 255  * @keyslot - requested keyslot or CRYPT_ANY_SLOT
 256  * @keyfile - key file used to unlock volume key, NULL for passphrase query
 257  * @keyfile_size - number of bytes to read from @keyfile, 0 is unlimited
 258  * @new_keyfile - keyfile for new keyslot, NULL for passphrase query
 259  * @new_keyfile_size - number of bytes to read from @new_keyfile, 0 is unlimited
 260  *
 261  * Note that @keyfile can be "-" for STDIN
 262  */
 263 int crypt_keyslot_add_by_keyfile(struct crypt_device *cd,
 264         int keyslot,
 265         const char *keyfile,
 266         size_t keyfile_size,
 267         const char *new_keyfile,
 268         size_t new_keyfile_size);
 269
 270 /**
 271  * Add key slot using provided volume key
 272  *
 273  * Returns allocated key slot number or negative errno otherwise.
 274  *
 275  * @cd - crypt device handle
 276  * @keyslot - requested keyslot or CRYPT_ANY_SLOT
 277  * @volume_key - provided volume key or NULL if used after crypt_format
 278  * @volume_key_size - size of @volume_key
 279  * @passphrase - passphrase for new keyslot, NULL for query
 280  * @passphrase_size - size of @passphrase
 281  */
 282 int crypt_keyslot_add_by_volume_key(struct crypt_device *cd,
 283         int keyslot,
 284         const char *volume_key,
 285         size_t volume_key_size,
 286         const char *passphrase,
 287         size_t passphrase_size);
 288
 289 /**
 290  * Destroy (and disable) key slot
 291  *
 292  * Returns 0 on success or negative errno value otherwise.
 293  *
 294  * @cd - crypt device handle
 295  * @keyslot - requested key slot to destroy
 296  *
 297  * Note that there is no passphrase verification used.
 298  */
 299 int crypt_keyslot_destroy(struct crypt_device *cd, int keyslot);
 300
 301 /**
 302  * Activation flags
 303  */
 304 #define CRYPT_ACTIVATE_READONLY (1 << 0)
 305 #define CRYPT_ACTIVATE_NO_UUID  (1 << 1)
 306
 307 /**
 308  * Activate device or check passphrase
 309  *
 310  * Returns unlocked key slot number or negative errno otherwise.
 311  *
 312  * @cd - crypt device handle
 313  * @name - name of device to create, if NULL only check passphrase
 314  * @keyslot - requested keyslot to check or CRYPT_ANY_SLOT
 315  * @passphrase - passphrase used to unlock volume key, NULL for query
 316  * @passphrase_size - size of @passphrase
 317  * @flags - activation flags
 318  */
 319 int crypt_activate_by_passphrase(struct crypt_device *cd,
 320         const char *name,
 321         int keyslot,
 322         const char *passphrase,
 323         size_t passphrase_size,
 324         uint32_t flags);
 325
 326 /**
 327  * Activate device or check using key file
 328  *
 329  * Returns unlocked key slot number or negative errno otherwise.
 330  *
 331  * @cd - crypt device handle
 332  * @name - name of device to create, if NULL only check keyfile
 333  * @keyslot - requested keyslot to check or CRYPT_ANY_SLOT
 334  * @keyfile - key file used to unlock volume key
 335  * @keyfile_size - number of bytes to read from @keyfile, 0 is unlimited
 336  * @flags - activation flags
 337  */
 338 int crypt_activate_by_keyfile(struct crypt_device *cd,
 339         const char *name,
 340         int keyslot,
 341         const char *keyfile,
 342         size_t keyfile_size,
 343         uint32_t flags);
 344
 345 /**
 346  * Activate device using provided volume key
 347  *
 348  * Returns 0 on success or negative errno value otherwise.
 349  *
 350  * @cd - crypt device handle
 351  * @name - name of device to create, if NULL only check volume key
 352  * @volume_key - provided volume key
 353  * @volume_key_size - size of @volume_key
 354  * @flags - activation flags
 355  */
 356 int crypt_activate_by_volume_key(struct crypt_device *cd,
 357         const char *name,
 358         const char *volume_key,
 359         size_t volume_key_size,
 360         uint32_t flags);
 361
 362 /**
 363  * Deactivate crypt device
 364  *
 365  * @cd - crypt device handle, can be NULL
 366  * @name - name of device to deactivate
 367   */
 368 int crypt_deactivate(struct crypt_device *cd, const char *name);
 369
 370 /**
 371  * Get volume key from of crypt device
 372  *
 373  * Returns unlocked key slot number or negative errno otherwise.
 374  *
 375  * @cd - crypt device handle
 376  * @keyslot - use this keyslot or CRYPT_ANY_SLOT
 377  * @volume_key - buffer for volume key
 378  * @volume_key_size - on input, size of buffer @volume_key,
 379  *                    on output size of @volume_key
 380  * @passphrase - passphrase used to unlock volume key, NULL for query
 381  * @passphrase_size - size of @passphrase
 382  */
 383 int crypt_volume_key_get(struct crypt_device *cd,
 384         int keyslot,
 385         char *volume_key,
 386         size_t *volume_key_size,
 387         const char *passphrase,
 388         size_t passphrase_size);
 389
 390 /**
 391  * Verify that provided volume key is valid for crypt device
 392  *
 393  * Returns 0 on success or negative errno value otherwise.
 394  *
 395  * @cd - crypt device handle
 396  * @volume_key - provided volume key
 397  * @volume_key_size - size of @volume_key
 398  */
 399 int crypt_volume_key_verify(struct crypt_device *cd,
 400         const char *volume_key,
 401         size_t volume_key_size);
 402
 403 /**
 404  * Get status info about device name
 405  *
 406  * Returns value defined by crypt_status_info.
 407  *
 408  * @cd - crypt device handle, can be NULL
 409  * @name -crypt device name
 410  *
 411  * CRYPT_INACTIVE - no such mapped device
 412  * CRYPT_ACTIVE - device is active
 413  * CRYPT_BUSY - device is active and has open count > 0
 414  */
 415 typedef enum {
 416         CRYPT_INVALID,
 417         CRYPT_INACTIVE,
 418         CRYPT_ACTIVE,
 419         CRYPT_BUSY
 420 } crypt_status_info;
 421 crypt_status_info crypt_status(struct crypt_device *cd, const char *name);
 422
 423 /**
 424  * Dump text-formatted information about crypt device to log output
 425  *
 426  * Returns 0 on success or negative errno value otherwise.
 427  *
 428  * @cd - crypt device handle, can be NULL
 429  */
 430 int crypt_dump(struct crypt_device *cd);
 431
 432 /**
 433  * Various crypt device info functions
 434  *
 435  * @cd - crypt device handle
 436  *
 437  * cipher - used cipher, e.g. "aes" or NULL otherwise
 438  * cipher_mode - used cipher mode including IV, e.g. "xts-plain" or NULL otherwise
 439  * uuid - device UUID or NULL if not set
 440  * data_offset - device offset in sectors where real data starts on underlying device)
 441  * volume_key_size - size (in bytes) of volume key for crypt device
 442  */
 443 const char *crypt_get_cipher(struct crypt_device *cd);
 444 const char *crypt_get_cipher_mode(struct crypt_device *cd);
 445 const char *crypt_get_uuid(struct crypt_device *cd);
 446 uint64_t crypt_get_data_offset(struct crypt_device *cd);
 447 int crypt_get_volume_key_size(struct crypt_device *cd);
 448
 449 /**
 450  * Get information about particular key slot
 451  *
 452  * Returns value defined by crypt_keyslot_info.
 453  *
 454  * @cd - crypt device handle
 455  * @keyslot - requested keyslot to check or CRYPT_ANY_SLOT
 456  */
 457 typedef enum {
 458         CRYPT_SLOT_INVALID,
 459         CRYPT_SLOT_INACTIVE,
 460         CRYPT_SLOT_ACTIVE,
 461         CRYPT_SLOT_ACTIVE_LAST
 462 } crypt_keyslot_info;
 463 crypt_keyslot_info crypt_keyslot_status(struct crypt_device *cd, int keyslot);
 464
 465 /**
 466  * Backup header and keyslots to file
 467  *
 468  * Returns 0 on success or negative errno value otherwise.
 469  *
 470  * @cd - crypt device handle
 471  * @requested_type - type of header to backup
 472  * @backup_file - file to backup header to
 473  */
 474 int crypt_header_backup(struct crypt_device *cd,
 475         const char *requested_type,
 476         const char *backup_file);
 477
 478 /**
 479  * Restore header and keyslots from backup file
 480  *
 481  * Returns 0 on success or negative errno value otherwise.
 482  *
 483  * @cd - crypt device handle
 484  * @requested_type - type of header to restore
 485  * @backup_file - file to restore header from
 486  */
 487 int crypt_header_restore(struct crypt_device *cd,
 488         const char *requested_type,
 489         const char *backup_file);
 490
 491 /**
 492  * Receives last reported error
 493  *
 494  * @buf - buffef for message
 495  * @size - size of buffer
 496  *
 497  * Note that this is old API function using global context.
 498  * All error messages are reported also through log callback.
 499  */
 500 void crypt_get_error(char *buf, size_t size);
 501
 502 /**
 503  * Get directory where mapped crypt devices are created
 504  */
 505 const char *crypt_get_dir(void);
 506
 507 /**
 508  * Set library debug level
 509  */
 510 #define CRYPT_DEBUG_ALL  -1
 511 #define CRYPT_DEBUG_NONE  0
 512 void crypt_set_debug_level(int level);
 513
 514 /**
 515  * OLD DEPRECATED API **********************************
 516  *
 517  * Provided only for backward compatibility.
 518  */
 519
 520 struct interface_callbacks {
 521     int (*yesDialog)(char *msg);
 522     void (*log)(int level, char *msg);
 523 };
 524
 525 #define CRYPT_FLAG_VERIFY               (1 << 0)
 526 #define CRYPT_FLAG_READONLY             (1 << 1)
 527 #define CRYPT_FLAG_VERIFY_IF_POSSIBLE   (1 << 2)
 528 #define CRYPT_FLAG_VERIFY_ON_DELKEY     (1 << 3)
 529 #define CRYPT_FLAG_NON_EXCLUSIVE_ACCESS (1 << 4)
 530
 531 struct crypt_options {
 532         const char      *name;
 533         const char      *device;
 534
 535         const char      *cipher;
 536         const char      *hash;
 537
 538         const char      *passphrase;
 539         int             passphrase_fd;
 540         const char      *key_file;
 541         const char      *new_key_file;
 542         int             key_size;
 543
 544         unsigned int    flags;
 545         int             key_slot;
 546
 547         uint64_t        size;
 548         uint64_t        offset;
 549         uint64_t        skip;
 550         uint64_t        iteration_time;
 551         uint64_t        timeout;
 552
 553         uint64_t        align_payload;
 554         int             tries;
 555
 556         struct interface_callbacks *icb;
 557 };
 558
 559 int crypt_create_device(struct crypt_options *options);
 560 int crypt_update_device(struct crypt_options *options);
 561 int crypt_resize_device(struct crypt_options *options);
 562 int crypt_query_device(struct crypt_options *options);
 563 int crypt_remove_device(struct crypt_options *options);
 564 int crypt_luksFormat(struct crypt_options *options);
 565 int crypt_luksOpen(struct crypt_options *options);
 566 int crypt_luksKillSlot(struct crypt_options *options);
 567 int crypt_luksRemoveKey(struct crypt_options *options);
 568 int crypt_luksAddKey(struct crypt_options *options);
 569 int crypt_luksUUID(struct crypt_options *options);
 570 int crypt_isLuks(struct crypt_options *options);
 571 int crypt_luksDump(struct crypt_options *options);
 572
 573 void crypt_put_options(struct crypt_options *options);
 574
 575 #ifdef __cplusplus
 576 }
 577 #endif
 578 #endif /* _LIBCRYPTSETUP_H */