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 */
153 * @cd - crypt device handle
155 * Returns string according to device type or NULL if not known.
157 const char *crypt_get_type(struct crypt_device *cd);
159 struct crypt_params_plain {
160 const char *hash; /* password hash function */
161 uint64_t offset; /* offset in sectors */
162 uint64_t skip; /* IV initilisation sector */
165 struct crypt_params_luks1 {
166 const char *hash; /* hash used in LUKS header */
167 size_t data_alignment; /* in sectors, data offset is multiple of this */
171 * Create (format) new crypt device (and possible header on-disk) but not activates it.
173 * Returns 0 on success or negative errno value otherwise.
175 * @cd - crypt device handle
176 * @type - type of device (optional params struct must be of this type)
177 * @cipher - (e.g. "aes")
178 * @cipher_mode - including IV specification (e.g. "xts-plain")
179 * @uuid - requested UUID or NULL if it should be generated
180 * @volume_key - pre-generated volume key or NULL if it should be generated (only for LUKS)
181 * @volume_key_size - size of volume key in bytes.
182 * @params - crypt type specific parameters
184 * Note that crypt_format does not enable any keyslot, but it stores volume key internally
185 * and subsequent crypt_keyslot_add_* calls can be used.
187 int crypt_format(struct crypt_device *cd,
190 const char *cipher_mode,
192 const char *volume_key,
193 size_t volume_key_size,
197 * Set new UUID for already existing device (if format supports it)
199 * Returns 0 on success or negative errno value otherwise.
201 * @cd - crypt device handle
202 * @uuid - requested UUID or NULL if it should be generated
204 int crypt_set_uuid(struct crypt_device *cd,
208 * Load crypt device parameters from on-disk header
210 * Returns 0 on success or negative errno value otherwise.
212 * @cd - crypt device handle
213 * @requested_type - use NULL for all known
214 * @params - crypt type specific parameters
216 int crypt_load(struct crypt_device *cd,
217 const char *requested_type,
221 * Resize crypt device
223 * Returns 0 on success or negative errno value otherwise.
225 * @cd - crypt device handle
226 * @name - name of device to resize
227 * @new_size - new device size in sectors or 0 to use underlying device size
229 int crypt_resize(struct crypt_device *cd,
234 * Suspends crypt device.
236 * Returns 0 on success or negative errno value otherwise.
238 * @cd - crypt device handle, can be NULL
239 * @name - name of device to suspend
241 int crypt_suspend(struct crypt_device *cd,
245 * Resumes crypt device using passphrase.
247 * Returns unlocked key slot number or negative errno otherwise.
249 * @cd - crypt device handle
250 * @name - name of device to resume
251 * @keyslot - requested keyslot or CRYPT_ANY_SLOT
252 * @passphrase - passphrase used to unlock volume key, NULL for query
253 * @passphrase_size - size of @passphrase (binary data)
255 int crypt_resume_by_passphrase(struct crypt_device *cd,
258 const char *passphrase,
259 size_t passphrase_size);
262 * Resumes crypt device using key file.
264 * Returns unlocked key slot number or negative errno otherwise.
266 * @cd - crypt device handle
267 * @name - name of device to resume
268 * @keyslot - requested keyslot or CRYPT_ANY_SLOT
269 * @keyfile - key file used to unlock volume key, NULL for passphrase query
270 * @keyfile_size - number of bytes to read from @keyfile, 0 is unlimited
272 int crypt_resume_by_keyfile(struct crypt_device *cd,
276 size_t keyfile_size);
279 * Releases crypt device context and used memory.
281 * @cd - crypt device handle
283 void crypt_free(struct crypt_device *cd);
286 * Add key slot using provided passphrase
288 * Returns allocated key slot number or negative errno otherwise.
290 * @cd - crypt device handle
291 * @keyslot - requested keyslot or CRYPT_ANY_SLOT
292 * @passphrase - passphrase used to unlock volume key, NULL for query
293 * @passphrase_size - size of @passphrase (binary data)
294 * @new_passphrase - passphrase for new keyslot, NULL for query
295 * @new_passphrase_size - size of @new_passphrase (binary data)
297 #define CRYPT_ANY_SLOT -1
298 int crypt_keyslot_add_by_passphrase(struct crypt_device *cd,
300 const char *passphrase,
301 size_t passphrase_size,
302 const char *new_passphrase,
303 size_t new_passphrase_size);
306 * Get number of keyslots supported for device type.
308 * Returns slot count or negative errno otherwise if device
309 * doesn't not support keyslots.
311 * @type - crypt device type
313 int crypt_keyslot_max(const char *type);
316 * Add key slot using provided key file path
318 * Returns allocated key slot number or negative errno otherwise.
320 * @cd - crypt device handle
321 * @keyslot - requested keyslot or CRYPT_ANY_SLOT
322 * @keyfile - key file used to unlock volume key, NULL for passphrase query
323 * @keyfile_size - number of bytes to read from @keyfile, 0 is unlimited
324 * @new_keyfile - keyfile for new keyslot, NULL for passphrase query
325 * @new_keyfile_size - number of bytes to read from @new_keyfile, 0 is unlimited
327 * Note that @keyfile can be "-" for STDIN
329 int crypt_keyslot_add_by_keyfile(struct crypt_device *cd,
333 const char *new_keyfile,
334 size_t new_keyfile_size);
337 * Add key slot using provided volume key
339 * Returns allocated key slot number or negative errno otherwise.
341 * @cd - crypt device handle
342 * @keyslot - requested keyslot or CRYPT_ANY_SLOT
343 * @volume_key - provided volume key or NULL if used after crypt_format
344 * @volume_key_size - size of @volume_key
345 * @passphrase - passphrase for new keyslot, NULL for query
346 * @passphrase_size - size of @passphrase
348 int crypt_keyslot_add_by_volume_key(struct crypt_device *cd,
350 const char *volume_key,
351 size_t volume_key_size,
352 const char *passphrase,
353 size_t passphrase_size);
356 * Destroy (and disable) key slot
358 * Returns 0 on success or negative errno value otherwise.
360 * @cd - crypt device handle
361 * @keyslot - requested key slot to destroy
363 * Note that there is no passphrase verification used.
365 int crypt_keyslot_destroy(struct crypt_device *cd, int keyslot);
370 #define CRYPT_ACTIVATE_READONLY (1 << 0)
371 #define CRYPT_ACTIVATE_NO_UUID (1 << 1)
374 * Active device runtime attributes
376 struct crypt_active_device {
377 uint64_t offset; /* offset in sectors */
378 uint64_t iv_offset; /* IV initilisation sector */
379 uint64_t size; /* active device size */
380 uint32_t flags; /* activation flags */
384 * Receives runtime attributes of active crypt device
386 * Returns 0 on success or negative errno value otherwise.
388 * @cd - crypt device handle (can be NULL)
389 * @name - name of active device
390 * @cad - preallocated active device attributes to fill
392 int crypt_get_active_device(struct crypt_device *cd,
394 struct crypt_active_device *cad);
397 * Activate device or check passphrase
399 * Returns unlocked key slot number or negative errno otherwise.
401 * @cd - crypt device handle
402 * @name - name of device to create, if NULL only check passphrase
403 * @keyslot - requested keyslot to check or CRYPT_ANY_SLOT
404 * @passphrase - passphrase used to unlock volume key, NULL for query
405 * @passphrase_size - size of @passphrase
406 * @flags - activation flags
408 int crypt_activate_by_passphrase(struct crypt_device *cd,
411 const char *passphrase,
412 size_t passphrase_size,
416 * Activate device or check using key file
418 * Returns unlocked key slot number or negative errno otherwise.
420 * @cd - crypt device handle
421 * @name - name of device to create, if NULL only check keyfile
422 * @keyslot - requested keyslot to check or CRYPT_ANY_SLOT
423 * @keyfile - key file used to unlock volume key
424 * @keyfile_size - number of bytes to read from @keyfile, 0 is unlimited
425 * @flags - activation flags
427 int crypt_activate_by_keyfile(struct crypt_device *cd,
435 * Activate device using provided volume key
437 * Returns 0 on success or negative errno value otherwise.
439 * @cd - crypt device handle
440 * @name - name of device to create, if NULL only check volume key
441 * @volume_key - provided volume key (or NULL to use internal)
442 * @volume_key_size - size of @volume_key
443 * @flags - activation flags
445 * If NULL is used for volume_key, device has to be initialized
446 * by previous operation (like crypt_format() or crypt_init_by_name())
448 int crypt_activate_by_volume_key(struct crypt_device *cd,
450 const char *volume_key,
451 size_t volume_key_size,
455 * Deactivate crypt device
457 * @cd - crypt device handle, can be NULL
458 * @name - name of device to deactivate
460 int crypt_deactivate(struct crypt_device *cd, const char *name);
463 * Get volume key from of crypt device
465 * Returns unlocked key slot number or negative errno otherwise.
467 * @cd - crypt device handle
468 * @keyslot - use this keyslot or CRYPT_ANY_SLOT
469 * @volume_key - buffer for volume key
470 * @volume_key_size - on input, size of buffer @volume_key,
471 * on output size of @volume_key
472 * @passphrase - passphrase used to unlock volume key, NULL for query
473 * @passphrase_size - size of @passphrase
475 int crypt_volume_key_get(struct crypt_device *cd,
478 size_t *volume_key_size,
479 const char *passphrase,
480 size_t passphrase_size);
483 * Verify that provided volume key is valid for crypt device
485 * Returns 0 on success or negative errno value otherwise.
487 * @cd - crypt device handle
488 * @volume_key - provided volume key
489 * @volume_key_size - size of @volume_key
491 int crypt_volume_key_verify(struct crypt_device *cd,
492 const char *volume_key,
493 size_t volume_key_size);
496 * Get status info about device name
498 * Returns value defined by crypt_status_info.
500 * @cd - crypt device handle, can be NULL
501 * @name -crypt device name
503 * CRYPT_INACTIVE - no such mapped device
504 * CRYPT_ACTIVE - device is active
505 * CRYPT_BUSY - device is active and has open count > 0
513 crypt_status_info crypt_status(struct crypt_device *cd, const char *name);
516 * Dump text-formatted information about crypt device to log output
518 * Returns 0 on success or negative errno value otherwise.
520 * @cd - crypt device handle
522 int crypt_dump(struct crypt_device *cd);
525 * Various crypt device info functions
527 * @cd - crypt device handle
529 * cipher - used cipher, e.g. "aes" or NULL otherwise
530 * cipher_mode - used cipher mode including IV, e.g. "xts-plain" or NULL otherwise
531 * uuid - device UUID or NULL if not set
532 * device_name - underlying device name or NULL if not yet set
533 * data_offset - device offset in sectors where real data starts on underlying device)
534 * volume_key_size - size (in bytes) of volume key for crypt device
536 const char *crypt_get_cipher(struct crypt_device *cd);
537 const char *crypt_get_cipher_mode(struct crypt_device *cd);
538 const char *crypt_get_uuid(struct crypt_device *cd);
539 const char *crypt_get_device_name(struct crypt_device *cd);
540 uint64_t crypt_get_data_offset(struct crypt_device *cd);
541 int crypt_get_volume_key_size(struct crypt_device *cd);
544 * Get information about particular key slot
546 * Returns value defined by crypt_keyslot_info.
548 * @cd - crypt device handle
549 * @keyslot - requested keyslot to check or CRYPT_ANY_SLOT
555 CRYPT_SLOT_ACTIVE_LAST
556 } crypt_keyslot_info;
557 crypt_keyslot_info crypt_keyslot_status(struct crypt_device *cd, int keyslot);
560 * Backup header and keyslots to file
562 * Returns 0 on success or negative errno value otherwise.
564 * @cd - crypt device handle
565 * @requested_type - type of header to backup
566 * @backup_file - file to backup header to
568 int crypt_header_backup(struct crypt_device *cd,
569 const char *requested_type,
570 const char *backup_file);
573 * Restore header and keyslots from backup file
575 * Returns 0 on success or negative errno value otherwise.
577 * @cd - crypt device handle
578 * @requested_type - type of header to restore
579 * @backup_file - file to restore header from
581 int crypt_header_restore(struct crypt_device *cd,
582 const char *requested_type,
583 const char *backup_file);
586 * Receives last reported error
588 * @buf - buffef for message
589 * @size - size of buffer
591 * Note that this is old API function using global context.
592 * All error messages are reported also through log callback.
594 void crypt_get_error(char *buf, size_t size);
597 * Get directory where mapped crypt devices are created
599 const char *crypt_get_dir(void);
602 * Set library debug level
604 #define CRYPT_DEBUG_ALL -1
605 #define CRYPT_DEBUG_NONE 0
606 void crypt_set_debug_level(int level);
609 * OLD DEPRECATED API **********************************
611 * Provided only for backward compatibility.
614 struct interface_callbacks {
615 int (*yesDialog)(char *msg);
616 void (*log)(int level, char *msg);
619 #define CRYPT_FLAG_VERIFY (1 << 0)
620 #define CRYPT_FLAG_READONLY (1 << 1)
621 #define CRYPT_FLAG_VERIFY_IF_POSSIBLE (1 << 2)
622 #define CRYPT_FLAG_VERIFY_ON_DELKEY (1 << 3)
623 #define CRYPT_FLAG_NON_EXCLUSIVE_ACCESS (1 << 4)
625 struct crypt_options {
632 const char *passphrase;
634 const char *key_file;
635 const char *new_key_file;
644 uint64_t iteration_time;
647 uint64_t align_payload;
650 struct interface_callbacks *icb;
653 int crypt_create_device(struct crypt_options *options);
654 int crypt_update_device(struct crypt_options *options);
655 int crypt_resize_device(struct crypt_options *options);
656 int crypt_query_device(struct crypt_options *options);
657 int crypt_remove_device(struct crypt_options *options);
658 int crypt_luksFormat(struct crypt_options *options);
659 int crypt_luksOpen(struct crypt_options *options);
660 int crypt_luksKillSlot(struct crypt_options *options);
661 int crypt_luksRemoveKey(struct crypt_options *options);
662 int crypt_luksAddKey(struct crypt_options *options);
663 int crypt_luksUUID(struct crypt_options *options);
664 int crypt_isLuks(struct crypt_options *options);
665 int crypt_luksDump(struct crypt_options *options);
667 void crypt_put_options(struct crypt_options *options);
672 #endif /* _LIBCRYPTSETUP_H */