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 * - 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)
94 void crypt_set_password_callback(struct crypt_device *cd,
95 int (*password)(const char *msg, char *buf, size_t length, void *usrptr),
99 * Various crypt device parameters
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
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);
113 * Set which RNG (random number generator) is used for generating long term key
114 * @cd - crypt device handle
115 * @rng_type - kernel random number generator to use
117 * CRYPT_RNG_URANDOM - use /dev/urandom
118 * CRYPT_RNG_RANDOM - use /dev/random (waits if no entropy in system)
120 #define CRYPT_RNG_URANDOM 0
121 #define CRYPT_RNG_RANDOM 1
122 void crypt_set_rng_type(struct crypt_device *cd, int rng_type);
125 * Get which RNG (random number generator) is used for generating long term key
127 * Returns RNG type on success or negative errno value otherwise.
129 * @cd - crypt device handle
131 int crypt_get_rng_type(struct crypt_device *cd);
134 * Helper to lock/unlock memory to avoid swap sensitive data to disk
136 * @cd - crypt device handle, can be NULL
137 * @lock - 0 to unloct otherwise lock memory
139 * Return value indicates that memory is locked (function can be called multiple times).
140 * Only root can do this. Note it locks/unlocks all process memory, not only crypt context.
142 int crypt_memory_lock(struct crypt_device *cd, int lock);
144 #define CRYPT_PLAIN "PLAIN" /* regular crypt device, no on-disk header */
145 #define CRYPT_LUKS1 "LUKS1" /* LUKS version 1 header on-disk */
147 struct crypt_params_plain {
148 const char *hash; /* password hash function */
149 uint64_t offset; /* offset in sectors */
150 uint64_t skip; /* IV initilisation sector */
153 struct crypt_params_luks1 {
154 const char *hash; /* hash used in LUKS header */
155 size_t data_alignment; /* in sectors, data offset is multiple of this */
159 * Create (format) new crypt device (and possible header on-disk) but not activates it.
161 * Returns 0 on success or negative errno value otherwise.
163 * @cd - crypt device handle
164 * @type - type of device (optional params struct must be of this type)
165 * @cipher - (e.g. "aes")
166 * @cipher_mode - including IV specification (e.g. "xts-plain")
167 * @uuid - requested UUID or NULL if it should be generated
168 * @volume_key - pre-generated volume key or NULL if it should be generated (only for LUKS)
169 * @volume_key_size - size og volume key in bytes.
170 * @params - crypt type specific parameters
172 * Note that crypt_format do not enable any keyslot, but it stores volume key internally
173 * and subsequent crypt_keyslot_add_* calls can be used.
174 * (It is the only situation when crypt_keyslot_add_* do not require active key slots.)
176 int crypt_format(struct crypt_device *cd,
179 const char *cipher_mode,
181 const char *volume_key,
182 size_t volume_key_size,
186 * Set new UUID for already existing device (if format supports it)
188 * Returns 0 on success or negative errno value otherwise.
190 * @cd - crypt device handle
191 * @uuid - requested UUID or NULL if it should be generated
193 int crypt_set_uuid(struct crypt_device *cd,
197 * Load crypt device parameters from on-disk header
199 * Returns 0 on success or negative errno value otherwise.
201 * @cd - crypt device handle
202 * @requested_type - use NULL for all known
203 * @params - crypt type specific parameters
205 int crypt_load(struct crypt_device *cd,
206 const char *requested_type,
210 * Suspends crypt device.
212 * Returns 0 on success or negative errno value otherwise.
214 * @cd - crypt device handle, can be NULL
215 * @name - name of device to suspend
217 int crypt_suspend(struct crypt_device *cd,
221 * Resumes crypt device using passphrase.
223 * Returns unlocked key slot number or negative errno otherwise.
225 * @cd - crypt device handle
226 * @name - name of device to resume
227 * @keyslot - requested keyslot or CRYPT_ANY_SLOT
228 * @passphrase - passphrase used to unlock volume key, NULL for query
229 * @passphrase_size - size of @passphrase (binary data)
231 int crypt_resume_by_passphrase(struct crypt_device *cd,
234 const char *passphrase,
235 size_t passphrase_size);
238 * Resumes crypt device using key file.
240 * Returns unlocked key slot number or negative errno otherwise.
242 * @cd - crypt device handle
243 * @name - name of device to resume
244 * @keyslot - requested keyslot or CRYPT_ANY_SLOT
245 * @keyfile - key file used to unlock volume key, NULL for passphrase query
246 * @keyfile_size - number of bytes to read from @keyfile, 0 is unlimited
248 int crypt_resume_by_keyfile(struct crypt_device *cd,
252 size_t keyfile_size);
255 * Releases crypt device context and used memory.
257 * @cd - crypt device handle
259 void crypt_free(struct crypt_device *cd);
262 * Add key slot using provided passphrase
264 * Returns allocated key slot number or negative errno otherwise.
266 * @cd - crypt device handle
267 * @keyslot - requested keyslot or CRYPT_ANY_SLOT
268 * @passphrase - passphrase used to unlock volume key, NULL for query
269 * @passphrase_size - size of @passphrase (binary data)
270 * @new_passphrase - passphrase for new keyslot, NULL for query
271 * @new_passphrase_size - size of @new_passphrase (binary data)
273 #define CRYPT_ANY_SLOT -1
274 int crypt_keyslot_add_by_passphrase(struct crypt_device *cd,
276 const char *passphrase,
277 size_t passphrase_size,
278 const char *new_passphrase,
279 size_t new_passphrase_size);
282 * Add key slot using provided key file path
284 * Returns allocated key slot number or negative errno otherwise.
286 * @cd - crypt device handle
287 * @keyslot - requested keyslot or CRYPT_ANY_SLOT
288 * @keyfile - key file used to unlock volume key, NULL for passphrase query
289 * @keyfile_size - number of bytes to read from @keyfile, 0 is unlimited
290 * @new_keyfile - keyfile for new keyslot, NULL for passphrase query
291 * @new_keyfile_size - number of bytes to read from @new_keyfile, 0 is unlimited
293 * Note that @keyfile can be "-" for STDIN
295 int crypt_keyslot_add_by_keyfile(struct crypt_device *cd,
299 const char *new_keyfile,
300 size_t new_keyfile_size);
303 * Add key slot using provided volume key
305 * Returns allocated key slot number or negative errno otherwise.
307 * @cd - crypt device handle
308 * @keyslot - requested keyslot or CRYPT_ANY_SLOT
309 * @volume_key - provided volume key or NULL if used after crypt_format
310 * @volume_key_size - size of @volume_key
311 * @passphrase - passphrase for new keyslot, NULL for query
312 * @passphrase_size - size of @passphrase
314 int crypt_keyslot_add_by_volume_key(struct crypt_device *cd,
316 const char *volume_key,
317 size_t volume_key_size,
318 const char *passphrase,
319 size_t passphrase_size);
322 * Destroy (and disable) key slot
324 * Returns 0 on success or negative errno value otherwise.
326 * @cd - crypt device handle
327 * @keyslot - requested key slot to destroy
329 * Note that there is no passphrase verification used.
331 int crypt_keyslot_destroy(struct crypt_device *cd, int keyslot);
336 #define CRYPT_ACTIVATE_READONLY (1 << 0)
337 #define CRYPT_ACTIVATE_NO_UUID (1 << 1)
340 * Activate device or check passphrase
342 * Returns unlocked key slot number or negative errno otherwise.
344 * @cd - crypt device handle
345 * @name - name of device to create, if NULL only check passphrase
346 * @keyslot - requested keyslot to check or CRYPT_ANY_SLOT
347 * @passphrase - passphrase used to unlock volume key, NULL for query
348 * @passphrase_size - size of @passphrase
349 * @flags - activation flags
351 int crypt_activate_by_passphrase(struct crypt_device *cd,
354 const char *passphrase,
355 size_t passphrase_size,
359 * Activate device or check using key file
361 * Returns unlocked key slot number or negative errno otherwise.
363 * @cd - crypt device handle
364 * @name - name of device to create, if NULL only check keyfile
365 * @keyslot - requested keyslot to check or CRYPT_ANY_SLOT
366 * @keyfile - key file used to unlock volume key
367 * @keyfile_size - number of bytes to read from @keyfile, 0 is unlimited
368 * @flags - activation flags
370 int crypt_activate_by_keyfile(struct crypt_device *cd,
378 * Activate device using provided volume key
380 * Returns 0 on success or negative errno value otherwise.
382 * @cd - crypt device handle
383 * @name - name of device to create, if NULL only check volume key
384 * @volume_key - provided volume key
385 * @volume_key_size - size of @volume_key
386 * @flags - activation flags
388 int crypt_activate_by_volume_key(struct crypt_device *cd,
390 const char *volume_key,
391 size_t volume_key_size,
395 * Deactivate crypt device
397 * @cd - crypt device handle, can be NULL
398 * @name - name of device to deactivate
400 int crypt_deactivate(struct crypt_device *cd, const char *name);
403 * Get volume key from of crypt device
405 * Returns unlocked key slot number or negative errno otherwise.
407 * @cd - crypt device handle
408 * @keyslot - use this keyslot or CRYPT_ANY_SLOT
409 * @volume_key - buffer for volume key
410 * @volume_key_size - on input, size of buffer @volume_key,
411 * on output size of @volume_key
412 * @passphrase - passphrase used to unlock volume key, NULL for query
413 * @passphrase_size - size of @passphrase
415 int crypt_volume_key_get(struct crypt_device *cd,
418 size_t *volume_key_size,
419 const char *passphrase,
420 size_t passphrase_size);
423 * Verify that provided volume key is valid for crypt device
425 * Returns 0 on success or negative errno value otherwise.
427 * @cd - crypt device handle
428 * @volume_key - provided volume key
429 * @volume_key_size - size of @volume_key
431 int crypt_volume_key_verify(struct crypt_device *cd,
432 const char *volume_key,
433 size_t volume_key_size);
436 * Get status info about device name
438 * Returns value defined by crypt_status_info.
440 * @cd - crypt device handle, can be NULL
441 * @name -crypt device name
443 * CRYPT_INACTIVE - no such mapped device
444 * CRYPT_ACTIVE - device is active
445 * CRYPT_BUSY - device is active and has open count > 0
453 crypt_status_info crypt_status(struct crypt_device *cd, const char *name);
456 * Dump text-formatted information about crypt device to log output
458 * Returns 0 on success or negative errno value otherwise.
460 * @cd - crypt device handle
462 int crypt_dump(struct crypt_device *cd);
465 * Various crypt device info functions
467 * @cd - crypt device handle
469 * cipher - used cipher, e.g. "aes" or NULL otherwise
470 * cipher_mode - used cipher mode including IV, e.g. "xts-plain" or NULL otherwise
471 * uuid - device UUID or NULL if not set
472 * device_name - underlying device name or NULL if not yet set
473 * data_offset - device offset in sectors where real data starts on underlying device)
474 * volume_key_size - size (in bytes) of volume key for crypt device
476 const char *crypt_get_cipher(struct crypt_device *cd);
477 const char *crypt_get_cipher_mode(struct crypt_device *cd);
478 const char *crypt_get_uuid(struct crypt_device *cd);
479 const char *crypt_get_device_name(struct crypt_device *cd);
480 uint64_t crypt_get_data_offset(struct crypt_device *cd);
481 int crypt_get_volume_key_size(struct crypt_device *cd);
484 * Get information about particular key slot
486 * Returns value defined by crypt_keyslot_info.
488 * @cd - crypt device handle
489 * @keyslot - requested keyslot to check or CRYPT_ANY_SLOT
495 CRYPT_SLOT_ACTIVE_LAST
496 } crypt_keyslot_info;
497 crypt_keyslot_info crypt_keyslot_status(struct crypt_device *cd, int keyslot);
500 * Backup header and keyslots to file
502 * Returns 0 on success or negative errno value otherwise.
504 * @cd - crypt device handle
505 * @requested_type - type of header to backup
506 * @backup_file - file to backup header to
508 int crypt_header_backup(struct crypt_device *cd,
509 const char *requested_type,
510 const char *backup_file);
513 * Restore header and keyslots from backup file
515 * Returns 0 on success or negative errno value otherwise.
517 * @cd - crypt device handle
518 * @requested_type - type of header to restore
519 * @backup_file - file to restore header from
521 int crypt_header_restore(struct crypt_device *cd,
522 const char *requested_type,
523 const char *backup_file);
526 * Receives last reported error
528 * @buf - buffef for message
529 * @size - size of buffer
531 * Note that this is old API function using global context.
532 * All error messages are reported also through log callback.
534 void crypt_get_error(char *buf, size_t size);
537 * Get directory where mapped crypt devices are created
539 const char *crypt_get_dir(void);
542 * Set library debug level
544 #define CRYPT_DEBUG_ALL -1
545 #define CRYPT_DEBUG_NONE 0
546 void crypt_set_debug_level(int level);
549 * OLD DEPRECATED API **********************************
551 * Provided only for backward compatibility.
554 struct interface_callbacks {
555 int (*yesDialog)(char *msg);
556 void (*log)(int level, char *msg);
559 #define CRYPT_FLAG_VERIFY (1 << 0)
560 #define CRYPT_FLAG_READONLY (1 << 1)
561 #define CRYPT_FLAG_VERIFY_IF_POSSIBLE (1 << 2)
562 #define CRYPT_FLAG_VERIFY_ON_DELKEY (1 << 3)
563 #define CRYPT_FLAG_NON_EXCLUSIVE_ACCESS (1 << 4)
565 struct crypt_options {
572 const char *passphrase;
574 const char *key_file;
575 const char *new_key_file;
584 uint64_t iteration_time;
587 uint64_t align_payload;
590 struct interface_callbacks *icb;
593 int crypt_create_device(struct crypt_options *options);
594 int crypt_update_device(struct crypt_options *options);
595 int crypt_resize_device(struct crypt_options *options);
596 int crypt_query_device(struct crypt_options *options);
597 int crypt_remove_device(struct crypt_options *options);
598 int crypt_luksFormat(struct crypt_options *options);
599 int crypt_luksOpen(struct crypt_options *options);
600 int crypt_luksKillSlot(struct crypt_options *options);
601 int crypt_luksRemoveKey(struct crypt_options *options);
602 int crypt_luksAddKey(struct crypt_options *options);
603 int crypt_luksUUID(struct crypt_options *options);
604 int crypt_isLuks(struct crypt_options *options);
605 int crypt_luksDump(struct crypt_options *options);
607 void crypt_put_options(struct crypt_options *options);
612 #endif /* _LIBCRYPTSETUP_H */