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 * Helper to lock/unlock memory to avoid swap sensitive data to disk
115 * @cd - crypt device handle, can be NULL
116 * @lock - 0 to unloct otherwise lock memory
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.
121 int crypt_memory_lock(struct crypt_device *cd, int lock);
123 #define CRYPT_PLAIN "PLAIN" /* regular crypt device, no on-disk header */
124 #define CRYPT_LUKS1 "LUKS1" /* LUKS version 1 header on-disk */
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 */
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 */
138 * Create (format) new crypt device (and possible header on-disk) but not activates it.
140 * Returns 0 on success or negative errno value otherwise.
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
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.)
155 int crypt_format(struct crypt_device *cd,
158 const char *cipher_mode,
160 const char *volume_key,
161 size_t volume_key_size,
165 * Load crypt device parameters from on-disk header
167 * Returns 0 on success or negative errno value otherwise.
169 * @cd - crypt device handle
170 * @requested_type - use NULL for all known
171 * @params - crypt type specific parameters
173 int crypt_load(struct crypt_device *cd,
174 const char *requested_type,
178 * Suspends crypt device.
180 * Returns 0 on success or negative errno value otherwise.
182 * @cd - crypt device handle, can be NULL
183 * @name - name of device to suspend
185 int crypt_suspend(struct crypt_device *cd,
189 * Resumes crypt device using passphrase.
191 * Returns unlocked key slot number or negative errno otherwise.
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)
199 int crypt_resume_by_passphrase(struct crypt_device *cd,
202 const char *passphrase,
203 size_t passphrase_size);
206 * Resumes crypt device using key file.
208 * Returns unlocked key slot number or negative errno otherwise.
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
216 int crypt_resume_by_keyfile(struct crypt_device *cd,
220 size_t keyfile_size);
223 * Releases crypt device context and used memory.
225 * @cd - crypt device handle
227 void crypt_free(struct crypt_device *cd);
230 * Add key slot using provided passphrase
232 * Returns allocated key slot number or negative errno otherwise.
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)
241 #define CRYPT_ANY_SLOT -1
242 int crypt_keyslot_add_by_passphrase(struct crypt_device *cd,
244 const char *passphrase,
245 size_t passphrase_size,
246 const char *new_passphrase,
247 size_t new_passphrase_size);
250 * Add key slot using provided key file path
252 * Returns allocated key slot number or negative errno otherwise.
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
261 * Note that @keyfile can be "-" for STDIN
263 int crypt_keyslot_add_by_keyfile(struct crypt_device *cd,
267 const char *new_keyfile,
268 size_t new_keyfile_size);
271 * Add key slot using provided volume key
273 * Returns allocated key slot number or negative errno otherwise.
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
282 int crypt_keyslot_add_by_volume_key(struct crypt_device *cd,
284 const char *volume_key,
285 size_t volume_key_size,
286 const char *passphrase,
287 size_t passphrase_size);
290 * Destroy (and disable) key slot
292 * Returns 0 on success or negative errno value otherwise.
294 * @cd - crypt device handle
295 * @keyslot - requested key slot to destroy
297 * Note that there is no passphrase verification used.
299 int crypt_keyslot_destroy(struct crypt_device *cd, int keyslot);
304 #define CRYPT_ACTIVATE_READONLY (1 << 0)
305 #define CRYPT_ACTIVATE_NO_UUID (1 << 1)
308 * Activate device or check passphrase
310 * Returns unlocked key slot number or negative errno otherwise.
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
319 int crypt_activate_by_passphrase(struct crypt_device *cd,
322 const char *passphrase,
323 size_t passphrase_size,
327 * Activate device or check using key file
329 * Returns unlocked key slot number or negative errno otherwise.
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
338 int crypt_activate_by_keyfile(struct crypt_device *cd,
346 * Activate device using provided volume key
348 * Returns 0 on success or negative errno value otherwise.
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
356 int crypt_activate_by_volume_key(struct crypt_device *cd,
358 const char *volume_key,
359 size_t volume_key_size,
363 * Deactivate crypt device
365 * @cd - crypt device handle, can be NULL
366 * @name - name of device to deactivate
368 int crypt_deactivate(struct crypt_device *cd, const char *name);
371 * Get volume key from of crypt device
373 * Returns unlocked key slot number or negative errno otherwise.
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
383 int crypt_volume_key_get(struct crypt_device *cd,
386 size_t *volume_key_size,
387 const char *passphrase,
388 size_t passphrase_size);
391 * Verify that provided volume key is valid for crypt device
393 * Returns 0 on success or negative errno value otherwise.
395 * @cd - crypt device handle
396 * @volume_key - provided volume key
397 * @volume_key_size - size of @volume_key
399 int crypt_volume_key_verify(struct crypt_device *cd,
400 const char *volume_key,
401 size_t volume_key_size);
404 * Get status info about device name
406 * Returns value defined by crypt_status_info.
408 * @cd - crypt device handle, can be NULL
409 * @name -crypt device name
411 * CRYPT_INACTIVE - no such mapped device
412 * CRYPT_ACTIVE - device is active
413 * CRYPT_BUSY - device is active and has open count > 0
421 crypt_status_info crypt_status(struct crypt_device *cd, const char *name);
424 * Dump text-formatted information about crypt device to log output
426 * Returns 0 on success or negative errno value otherwise.
428 * @cd - crypt device handle, can be NULL
430 int crypt_dump(struct crypt_device *cd);
433 * Various crypt device info functions
435 * @cd - crypt device handle
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
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);
450 * Get information about particular key slot
452 * Returns value defined by crypt_keyslot_info.
454 * @cd - crypt device handle
455 * @keyslot - requested keyslot to check or CRYPT_ANY_SLOT
461 CRYPT_SLOT_ACTIVE_LAST
462 } crypt_keyslot_info;
463 crypt_keyslot_info crypt_keyslot_status(struct crypt_device *cd, int keyslot);
466 * Backup header and keyslots to file
468 * Returns 0 on success or negative errno value otherwise.
470 * @cd - crypt device handle
471 * @requested_type - type of header to backup
472 * @backup_file - file to backup header to
474 int crypt_header_backup(struct crypt_device *cd,
475 const char *requested_type,
476 const char *backup_file);
479 * Restore header and keyslots from backup file
481 * Returns 0 on success or negative errno value otherwise.
483 * @cd - crypt device handle
484 * @requested_type - type of header to restore
485 * @backup_file - file to restore header from
487 int crypt_header_restore(struct crypt_device *cd,
488 const char *requested_type,
489 const char *backup_file);
492 * Receives last reported error
494 * @buf - buffef for message
495 * @size - size of buffer
497 * Note that this is old API function using global context.
498 * All error messages are reported also through log callback.
500 void crypt_get_error(char *buf, size_t size);
503 * Get directory where mapped crypt devices are created
505 const char *crypt_get_dir(void);
508 * Set library debug level
510 #define CRYPT_DEBUG_ALL -1
511 #define CRYPT_DEBUG_NONE 0
512 void crypt_set_debug_level(int level);
515 * OLD DEPRECATED API **********************************
517 * Provided only for backward compatibility.
520 struct interface_callbacks {
521 int (*yesDialog)(char *msg);
522 void (*log)(int level, char *msg);
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)
531 struct crypt_options {
538 const char *passphrase;
540 const char *key_file;
541 const char *new_key_file;
550 uint64_t iteration_time;
553 uint64_t align_payload;
556 struct interface_callbacks *icb;
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);
573 void crypt_put_options(struct crypt_options *options);
578 #endif /* _LIBCRYPTSETUP_H */