1 #ifndef _LIBCRYPTSETUP_H
2 #define _LIBCRYPTSETUP_H
9 struct crypt_device; /* crypt device handle */
12 * Initialise crypt device handle and check if provided device exists.
14 * Returns 0 on success or negative errno value otherwise.
16 * @cd - returns pointer to crypt device handle
17 * @device - path to device
19 * Note that logging is not initialized here, possible messages uses
20 * default log function.
22 int crypt_init(struct crypt_device **cd, const char *device);
25 * Initialise crypt device handle from provided active device name
26 * and check if provided device exists.
28 * Returns 0 on success or negative errno value otherwise.
30 * @cd - crypt device handle
31 * @name - name of active crypt device
33 int crypt_init_by_name(struct crypt_device **cd, const char *name);
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)
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),
52 * Log message through log function.
54 * @cd - crypt device handle
58 void crypt_log(struct crypt_device *cd, int level, const char *msg);
61 * Set confirmation callback (yes/no)
63 * If code need confirmation (like deleting last key slot) this function
64 * is called. If not defined, everything is confirmed.
66 * Calback should return 0 if operation is declined, other values mean accepted.
68 * @cd - crypt device handle
69 * @usrptr - provided identification in callback
70 * @msg - Message for user to confirm
72 void crypt_set_confirm_callback(struct crypt_device *cd,
73 int (*confirm)(const char *msg, void *usrptr),
77 * Set password query callback.
79 * If code need _interactive_ query for password, this callback is called.
80 * If not defined, compiled-in default is called (uses terminal input).
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
88 * Calback should return length of password in buffer
89 * or negative errno value in case of error.
91 * - Note that if this function is defined, verify option is ignored
92 * (caller which provided callback is responsible for password verification)
93 * - Only zero terminated passwords can be entered this way, for complex
94 * use API functions directly.
95 * - Maximal length of password is limited to @length-1 (minimal 511 chars)
97 void crypt_set_password_callback(struct crypt_device *cd,
98 int (*password)(const char *msg, char *buf, size_t length, void *usrptr),
102 * Various crypt device parameters
104 * @cd - crypt device handle
105 * @timeout - timeout in seconds for password entry if compiled-in function used
106 * @password_retry - number of tries for password if not verified
107 * @iteration_time - iteration time for LUKS header in miliseconds
108 * @password_verify - for compiled-in password query always verify passwords twice
110 void crypt_set_timeout(struct crypt_device *cd, uint64_t timeout_sec);
111 void crypt_set_password_retry(struct crypt_device *cd, int tries);
112 void crypt_set_iterarion_time(struct crypt_device *cd, uint64_t iteration_time_ms);
113 void crypt_set_password_verify(struct crypt_device *cd, int password_verify);
116 * Set which RNG (random number generator) is used for generating long term key
117 * @cd - crypt device handle
118 * @rng_type - kernel random number generator to use
120 * CRYPT_RNG_URANDOM - use /dev/urandom
121 * CRYPT_RNG_RANDOM - use /dev/random (waits if no entropy in system)
123 #define CRYPT_RNG_URANDOM 0
124 #define CRYPT_RNG_RANDOM 1
125 void crypt_set_rng_type(struct crypt_device *cd, int rng_type);
128 * Get which RNG (random number generator) is used for generating long term key
130 * Returns RNG type on success or negative errno value otherwise.
132 * @cd - crypt device handle
134 int crypt_get_rng_type(struct crypt_device *cd);
137 * Helper to lock/unlock memory to avoid swap sensitive data to disk
139 * @cd - crypt device handle, can be NULL
140 * @lock - 0 to unloct otherwise lock memory
142 * Return value indicates that memory is locked (function can be called multiple times).
143 * Only root can do this. Note it locks/unlocks all process memory, not only crypt context.
145 int crypt_memory_lock(struct crypt_device *cd, int lock);
147 #define CRYPT_PLAIN "PLAIN" /* regular crypt device, no on-disk header */
148 #define CRYPT_LUKS1 "LUKS1" /* LUKS version 1 header on-disk */
149 #define CRYPT_LOOPAES "LOOPAES" /* loop-AES compatibility mode */
154 * @cd - crypt device handle
156 * Returns string according to device type or NULL if not known.
158 const char *crypt_get_type(struct crypt_device *cd);
160 struct crypt_params_plain {
161 const char *hash; /* password hash function */
162 uint64_t offset; /* offset in sectors */
163 uint64_t skip; /* IV offset / initialisation sector */
164 uint64_t size; /* size of mapped device or 0 for autodetection */
167 struct crypt_params_luks1 {
168 const char *hash; /* hash used in LUKS header */
169 size_t data_alignment; /* in sectors, data offset is multiple of this */
172 struct crypt_params_loopaes {
173 const char *hash; /* key hash function */
174 uint64_t offset; /* offset in sectors */
175 uint64_t skip; /* IV offset / initialisation sector */
178 * Create (format) new crypt device (and possible header on-disk) but not activates it.
180 * Returns 0 on success or negative errno value otherwise.
182 * @cd - crypt device handle
183 * @type - type of device (optional params struct must be of this type)
184 * @cipher - (e.g. "aes")
185 * @cipher_mode - including IV specification (e.g. "xts-plain")
186 * @uuid - requested UUID or NULL if it should be generated
187 * @volume_key - pre-generated volume key or NULL if it should be generated (only for LUKS)
188 * @volume_key_size - size of volume key in bytes.
189 * @params - crypt type specific parameters
191 * Note that crypt_format does not enable any keyslot, but it stores volume key internally
192 * and subsequent crypt_keyslot_add_* calls can be used.
194 int crypt_format(struct crypt_device *cd,
197 const char *cipher_mode,
199 const char *volume_key,
200 size_t volume_key_size,
204 * Set new UUID for already existing device (if format supports it)
206 * Returns 0 on success or negative errno value otherwise.
208 * @cd - crypt device handle
209 * @uuid - requested UUID or NULL if it should be generated
211 int crypt_set_uuid(struct crypt_device *cd,
215 * Load crypt device parameters from on-disk header
217 * Returns 0 on success or negative errno value otherwise.
219 * @cd - crypt device handle
220 * @requested_type - use NULL for all known
221 * @params - crypt type specific parameters
223 int crypt_load(struct crypt_device *cd,
224 const char *requested_type,
228 * Resize crypt device
230 * Returns 0 on success or negative errno value otherwise.
232 * @cd - crypt device handle
233 * @name - name of device to resize
234 * @new_size - new device size in sectors or 0 to use underlying device size
236 int crypt_resize(struct crypt_device *cd,
241 * Suspends crypt device.
243 * Returns 0 on success or negative errno value otherwise.
245 * @cd - crypt device handle, can be NULL
246 * @name - name of device to suspend
248 int crypt_suspend(struct crypt_device *cd,
252 * Resumes crypt device using passphrase.
254 * Returns unlocked key slot number or negative errno otherwise.
256 * @cd - crypt device handle
257 * @name - name of device to resume
258 * @keyslot - requested keyslot or CRYPT_ANY_SLOT
259 * @passphrase - passphrase used to unlock volume key, NULL for query
260 * @passphrase_size - size of @passphrase (binary data)
262 int crypt_resume_by_passphrase(struct crypt_device *cd,
265 const char *passphrase,
266 size_t passphrase_size);
269 * Resumes crypt device using key file.
271 * Returns unlocked key slot number or negative errno otherwise.
273 * @cd - crypt device handle
274 * @name - name of device to resume
275 * @keyslot - requested keyslot or CRYPT_ANY_SLOT
276 * @keyfile - key file used to unlock volume key, NULL for passphrase query
277 * @keyfile_size - number of bytes to read from @keyfile, 0 is unlimited
279 int crypt_resume_by_keyfile(struct crypt_device *cd,
283 size_t keyfile_size);
286 * Releases crypt device context and used memory.
288 * @cd - crypt device handle
290 void crypt_free(struct crypt_device *cd);
293 * Add key slot using provided passphrase
295 * Returns allocated key slot number or negative errno otherwise.
297 * @cd - crypt device handle
298 * @keyslot - requested keyslot or CRYPT_ANY_SLOT
299 * @passphrase - passphrase used to unlock volume key, NULL for query
300 * @passphrase_size - size of @passphrase (binary data)
301 * @new_passphrase - passphrase for new keyslot, NULL for query
302 * @new_passphrase_size - size of @new_passphrase (binary data)
304 #define CRYPT_ANY_SLOT -1
305 int crypt_keyslot_add_by_passphrase(struct crypt_device *cd,
307 const char *passphrase,
308 size_t passphrase_size,
309 const char *new_passphrase,
310 size_t new_passphrase_size);
313 * Get number of keyslots supported for device type.
315 * Returns slot count or negative errno otherwise if device
316 * doesn't not support keyslots.
318 * @type - crypt device type
320 int crypt_keyslot_max(const char *type);
323 * Add key slot using provided key file path
325 * Returns allocated key slot number or negative errno otherwise.
327 * @cd - crypt device handle
328 * @keyslot - requested keyslot or CRYPT_ANY_SLOT
329 * @keyfile - key file used to unlock volume key, NULL for passphrase query
330 * @keyfile_size - number of bytes to read from @keyfile, 0 is unlimited
331 * @new_keyfile - keyfile for new keyslot, NULL for passphrase query
332 * @new_keyfile_size - number of bytes to read from @new_keyfile, 0 is unlimited
334 * Note that @keyfile can be "-" for STDIN
336 int crypt_keyslot_add_by_keyfile(struct crypt_device *cd,
340 const char *new_keyfile,
341 size_t new_keyfile_size);
344 * Add key slot using provided volume key
346 * Returns allocated key slot number or negative errno otherwise.
348 * @cd - crypt device handle
349 * @keyslot - requested keyslot or CRYPT_ANY_SLOT
350 * @volume_key - provided volume key or NULL if used after crypt_format
351 * @volume_key_size - size of @volume_key
352 * @passphrase - passphrase for new keyslot, NULL for query
353 * @passphrase_size - size of @passphrase
355 int crypt_keyslot_add_by_volume_key(struct crypt_device *cd,
357 const char *volume_key,
358 size_t volume_key_size,
359 const char *passphrase,
360 size_t passphrase_size);
363 * Destroy (and disable) key slot
365 * Returns 0 on success or negative errno value otherwise.
367 * @cd - crypt device handle
368 * @keyslot - requested key slot to destroy
370 * Note that there is no passphrase verification used.
372 int crypt_keyslot_destroy(struct crypt_device *cd, int keyslot);
377 #define CRYPT_ACTIVATE_READONLY (1 << 0)
378 #define CRYPT_ACTIVATE_NO_UUID (1 << 1) /* ignored */
379 #define CRYPT_ACTIVATE_SHARED (1 << 2)
380 #define CRYPT_ACTIVATE_ALLOW_DISCARDS (1 << 3) /* enable discards aka TRIM */
383 * Active device runtime attributes
385 struct crypt_active_device {
386 uint64_t offset; /* offset in sectors */
387 uint64_t iv_offset; /* IV initilisation sector */
388 uint64_t size; /* active device size */
389 uint32_t flags; /* activation flags */
393 * Receives runtime attributes of active crypt device
395 * Returns 0 on success or negative errno value otherwise.
397 * @cd - crypt device handle (can be NULL)
398 * @name - name of active device
399 * @cad - preallocated active device attributes to fill
401 int crypt_get_active_device(struct crypt_device *cd,
403 struct crypt_active_device *cad);
406 * Activate device or check passphrase
408 * Returns unlocked key slot number or negative errno otherwise.
410 * @cd - crypt device handle
411 * @name - name of device to create, if NULL only check passphrase
412 * @keyslot - requested keyslot to check or CRYPT_ANY_SLOT
413 * @passphrase - passphrase used to unlock volume key, NULL for query
414 * @passphrase_size - size of @passphrase
415 * @flags - activation flags
417 int crypt_activate_by_passphrase(struct crypt_device *cd,
420 const char *passphrase,
421 size_t passphrase_size,
425 * Activate device or check using key file
427 * Returns unlocked key slot number or negative errno otherwise.
429 * @cd - crypt device handle
430 * @name - name of device to create, if NULL only check keyfile
431 * @keyslot - requested keyslot to check or CRYPT_ANY_SLOT
432 * @keyfile - key file used to unlock volume key
433 * @keyfile_size - number of bytes to read from @keyfile, 0 is unlimited
434 * @flags - activation flags
436 int crypt_activate_by_keyfile(struct crypt_device *cd,
444 * Activate device using provided volume key
446 * Returns 0 on success or negative errno value otherwise.
448 * @cd - crypt device handle
449 * @name - name of device to create, if NULL only check volume key
450 * @volume_key - provided volume key (or NULL to use internal)
451 * @volume_key_size - size of @volume_key
452 * @flags - activation flags
454 * If NULL is used for volume_key, device has to be initialized
455 * by previous operation (like crypt_format() or crypt_init_by_name())
457 int crypt_activate_by_volume_key(struct crypt_device *cd,
459 const char *volume_key,
460 size_t volume_key_size,
464 * Deactivate crypt device
466 * @cd - crypt device handle, can be NULL
467 * @name - name of device to deactivate
469 int crypt_deactivate(struct crypt_device *cd, const char *name);
472 * Get volume key from of crypt device
474 * Returns unlocked key slot number or negative errno otherwise.
476 * @cd - crypt device handle
477 * @keyslot - use this keyslot or CRYPT_ANY_SLOT
478 * @volume_key - buffer for volume key
479 * @volume_key_size - on input, size of buffer @volume_key,
480 * on output size of @volume_key
481 * @passphrase - passphrase used to unlock volume key, NULL for query
482 * @passphrase_size - size of @passphrase
484 int crypt_volume_key_get(struct crypt_device *cd,
487 size_t *volume_key_size,
488 const char *passphrase,
489 size_t passphrase_size);
492 * Verify that provided volume key is valid for crypt device
494 * Returns 0 on success or negative errno value otherwise.
496 * @cd - crypt device handle
497 * @volume_key - provided volume key
498 * @volume_key_size - size of @volume_key
500 int crypt_volume_key_verify(struct crypt_device *cd,
501 const char *volume_key,
502 size_t volume_key_size);
505 * Get status info about device name
507 * Returns value defined by crypt_status_info.
509 * @cd - crypt device handle, can be NULL
510 * @name -crypt device name
512 * CRYPT_INACTIVE - no such mapped device
513 * CRYPT_ACTIVE - device is active
514 * CRYPT_BUSY - device is active and has open count > 0
522 crypt_status_info crypt_status(struct crypt_device *cd, const char *name);
525 * Dump text-formatted information about crypt device to log output
527 * Returns 0 on success or negative errno value otherwise.
529 * @cd - crypt device handle
531 int crypt_dump(struct crypt_device *cd);
534 * Various crypt device info functions
536 * @cd - crypt device handle
538 * cipher - used cipher, e.g. "aes" or NULL otherwise
539 * cipher_mode - used cipher mode including IV, e.g. "xts-plain" or NULL otherwise
540 * uuid - device UUID or NULL if not set
541 * device_name - underlying device name or NULL if not yet set
542 * data_offset - device offset in sectors where real data starts on underlying device)
543 * iv_offset - IV offset in sectors (skip)
544 * volume_key_size - size (in bytes) of volume key for crypt device
546 const char *crypt_get_cipher(struct crypt_device *cd);
547 const char *crypt_get_cipher_mode(struct crypt_device *cd);
548 const char *crypt_get_uuid(struct crypt_device *cd);
549 const char *crypt_get_device_name(struct crypt_device *cd);
550 uint64_t crypt_get_data_offset(struct crypt_device *cd);
551 uint64_t crypt_get_iv_offset(struct crypt_device *cd);
552 int crypt_get_volume_key_size(struct crypt_device *cd);
555 * Get information about particular key slot
557 * Returns value defined by crypt_keyslot_info.
559 * @cd - crypt device handle
560 * @keyslot - requested keyslot to check or CRYPT_ANY_SLOT
566 CRYPT_SLOT_ACTIVE_LAST
567 } crypt_keyslot_info;
568 crypt_keyslot_info crypt_keyslot_status(struct crypt_device *cd, int keyslot);
571 * Backup header and keyslots to file
573 * Returns 0 on success or negative errno value otherwise.
575 * @cd - crypt device handle
576 * @requested_type - type of header to backup
577 * @backup_file - file to backup header to
579 int crypt_header_backup(struct crypt_device *cd,
580 const char *requested_type,
581 const char *backup_file);
584 * Restore header and keyslots from backup file
586 * Returns 0 on success or negative errno value otherwise.
588 * @cd - crypt device handle
589 * @requested_type - type of header to restore
590 * @backup_file - file to restore header from
592 int crypt_header_restore(struct crypt_device *cd,
593 const char *requested_type,
594 const char *backup_file);
597 * Receives last reported error
599 * @buf - buffef for message
600 * @size - size of buffer
602 * Note that this is old API function using global context.
603 * All error messages are reported also through log callback.
605 void crypt_get_error(char *buf, size_t size);
608 * Get directory where mapped crypt devices are created
610 const char *crypt_get_dir(void);
613 * Set library debug level
615 #define CRYPT_DEBUG_ALL -1
616 #define CRYPT_DEBUG_NONE 0
617 void crypt_set_debug_level(int level);
622 #endif /* _LIBCRYPTSETUP_H */