+/*
+ * libcryptsetup - cryptsetup library
+ *
+ * Copyright (C) 2004, Christophe Saout <christophe@saout.de>
+ * Copyright (C) 2004-2007, Clemens Fruhwirth <clemens@endorphin.org>
+ * Copyright (C) 2009-2012, Red Hat, Inc. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+/**
+ * @file libcryptsetup.h
+ * @brief Public cryptsetup API
+ *
+ * For more verbose examples of LUKS related use cases,
+ * please read @ref index "examples".
+ */
+
#ifndef _LIBCRYPTSETUP_H
#define _LIBCRYPTSETUP_H
#ifdef __cplusplus
extern "C" {
#endif
+#include <stddef.h>
#include <stdint.h>
struct crypt_device; /* crypt device handle */
/**
- * Initialise crypt device handle and check if provided device exists.
+ * Initialize crypt device handle and check if provided device exists.
*
- * Returns 0 on success or negative errno value otherwise.
+ * @param cd Returns pointer to crypt device handle
+ * @param device Path to the backing device.
+ * If @e device is not a block device but a path to some file,
+ * the function will try to create a loopdevice and attach
+ * the file to the loopdevice with AUTOCLEAR flag set.
+ * If @e device is @e NULL function it will initialize dm backend only.
*
- * @cd - returns pointer to crypt device handle
- * @device - path to device
+ * @return @e 0 on success or negative errno value otherwise.
*
- * Note that logging is not initialized here, possible messages uses
- * default log function.
+ * @note Note that logging is not initialized here, possible messages uses
+ * default log function.
*/
int crypt_init(struct crypt_device **cd, const char *device);
/**
- * Initialise crypt device handle from provided active device name
+ * Initialize crypt device handle from provided active device name,
+ * and, optionally, from separate metadata (header) device
* and check if provided device exists.
*
- * Returns 0 on success or negative errno value otherwise.
+ * @return @e 0 on success or negative errno value otherwise.
+ *
+ * @param cd returns crypt device handle for active device
+ * @param name name of active crypt device
+ * @param header_device optional device containing on-disk header
+ * (@e NULL if it the same as underlying device on there is no on-disk header)
+ *
+ * @post In case @e device points to active LUKS device but header load fails,
+ * context device type is set to @e NULL and @e 0 is returned as if it were successful.
+ * Context with @e NULL device type can only be deactivated by crypt_deactivate
*
- * @cd - crypt device handle
- * @name - name of active crypt device
+ * @note @link crypt_init_by_name @endlink is equivalent to calling
+ * crypt_init_by_name_and_header(cd, name, NULL);
+ */
+int crypt_init_by_name_and_header(struct crypt_device **cd,
+ const char *name,
+ const char *header_device);
+
+/**
+ * This is equivalent to call
+ * @ref crypt_init_by_name_and_header "crypt_init_by_name_and_header(cd, name, NULL)"
+ *
+ * @sa crypt_init_by_name_and_header
*/
int crypt_init_by_name(struct crypt_device **cd, const char *name);
/**
- * Set log function.
+ * @defgroup loglevel "Cryptsetup logging"
+ *
+ * Set of functions and defines used in cryptsetup for
+ * logging purposes
*
- * @cd - crypt device handle (can be NULL to set default log function)
- * @usrptr - provided identification in callback
- * @level - log level below (debug messages can uses other levels)
- * @msg - log message
*/
+
+/**
+ * @addtogroup loglevel
+ * @{
+ */
+
+/** normal log level */
#define CRYPT_LOG_NORMAL 0
+/** error log level */
#define CRYPT_LOG_ERROR 1
+/** verbose log level */
#define CRYPT_LOG_VERBOSE 2
-#define CRYPT_LOG_DEBUG -1 /* always on stdout */
+/** debug log level - always on stdout */
+#define CRYPT_LOG_DEBUG -1
+
+/**
+ * Set log function.
+ *
+ * @param cd crypt device handle (can be @e NULL to set default log function)
+ * @param log user defined log function reference
+ * @param usrptr provided identification in callback
+ * @param level log level below (debug messages can uses other levels)
+ * @param msg log message
+ */
void crypt_set_log_callback(struct crypt_device *cd,
void (*log)(int level, const char *msg, void *usrptr),
void *usrptr);
/**
- * Log message through log function.
+ * Defines log function or use the default one otherwise.
*
- * @cd - crypt device handle
- * @level - log level
- * @msg - log message
+ * @see crypt_set_log_callback
+ *
+ * @param cd crypt device handle
+ * @param level log level
+ * @param msg log message
*/
void crypt_log(struct crypt_device *cd, int level, const char *msg);
+/** @} */
/**
* Set confirmation callback (yes/no)
*
- * If code need confirmation (like deleting last key slot) this function
- * is called. If not defined, everything is confirmed.
+ * If code need confirmation (like resetting uuid or restoring LUKS header from file)
+ * this function is called. If not defined, everything is confirmed.
+ *
+ * Callback function @e confirm should return @e 0 if operation is declined,
+ * other values mean accepted.
*
- * Calback should return 0 if operation is declined, other values mean accepted.
+ * @param cd crypt device handle
+ * @param confirm user defined confirm callback reference
+ * @param usrptr provided identification in callback
+ * @param msg Message for user to confirm
*
- * @cd - crypt device handle
- * @usrptr - provided identification in callback
- * @msg - Message for user to confirm
+ * @note Current version of cryptsetup API requires confirmation only when UUID is being changed
*/
void crypt_set_confirm_callback(struct crypt_device *cd,
int (*confirm)(const char *msg, void *usrptr),
/**
* Set password query callback.
*
- * If code need _interactive_ query for password, this callback is called.
+ * If code need @e _interactive_ query for password, this callback is called.
* If not defined, compiled-in default is called (uses terminal input).
*
- * @cd - crypt device handle
- * @usrptr - provided identification in callback
- * @msg - Message for user
- * @buf - buffer for password
- * @length - size of buffer
- *
- * Calback should return length of password in buffer
+ * Callback should return length of password in buffer
* or negative errno value in case of error.
*
- * - Note that if this function is defined, verify option is ignored
+ * @param cd crypt device handle
+ * @param password user defined password callback reference
+ * @param usrptr provided identification in callback
+ * @param msg Message for user
+ * @param buf buffer for password
+ * @param length size of buffer
+ *
+ * @note Note that if this function is defined, verify option is ignored
* (caller which provided callback is responsible for password verification)
- * - Only zero terminated passwords can be entered this way, for complex
+ * @note Only zero terminated passwords can be entered this way, for complex
* use API functions directly.
- * - Maximal length of password is limited to @length-1 (minimal 511 chars)
+ * @note Maximal length of password is limited to @e length @e - @e 1 (minimal 511 chars)
+ *
+ * @see Callback function is used in these call provided, that certain conditions are met:
+ * @li crypt_keyslot_add_by_passphrase
+ * @li crypt_activate_by_passphrase
+ * @li crypt_resume_by_passphrase
+ * @li crypt_resume_by_keyfile
+ * @li crypt_keyslot_add_by_keyfile
+ * @li crypt_keyslot_add_by_volume_key
+ *
*/
void crypt_set_password_callback(struct crypt_device *cd,
int (*password)(const char *msg, char *buf, size_t length, void *usrptr),
void *usrptr);
/**
- * Various crypt device parameters
+ * Set timeout for interactive password entry using default
+ * password callback
*
- * @cd - crypt device handle
- * @timeout - timeout in seconds for password entry if compiled-in function used
- * @password_retry - number of tries for password if not verified
- * @iteration_time - iteration time for LUKS header in miliseconds
- * @password_verify - for compiled-in password query always verify passwords twice
+ * @param cd crypt device handle
+ * @param timeout_sec timeout in seconds
*/
void crypt_set_timeout(struct crypt_device *cd, uint64_t timeout_sec);
+
+/**
+ * Set number of retries in case password input has been incorrect
+ *
+ * @param cd crypt device handle
+ * @param tries the number
+ */
void crypt_set_password_retry(struct crypt_device *cd, int tries);
+
+/**
+ * Set how long should cryptsetup iterate in PBKDF2 function.
+ * Default value heads towards the iterations which takes around 1 second
+ *
+ * @param cd crypt device handle
+ * @param iteration_time_ms the time in ms
+ */
+void crypt_set_iteration_time(struct crypt_device *cd, uint64_t iteration_time_ms);
+/* Don't ask :-) */
void crypt_set_iterarion_time(struct crypt_device *cd, uint64_t iteration_time_ms);
+
+/**
+ * Set whether passphrase will be verified on input
+ * (user has to input same passphrase twice)
+ *
+ * @param cd crypt device handle
+ * @param password_verify @e 0 = false, @e !0 true
+ */
void crypt_set_password_verify(struct crypt_device *cd, int password_verify);
/**
- * Set which RNG (random number generator) is used for generating long term key
- * @cd - crypt device handle
- * @rng_type - kernel random number generator to use
+ * Set data device
+ * For LUKS it is encrypted data device when LUKS header is separated.
+ * For VERITY it is data device when hash device is separated.
+ *
+ * @param cd crypt device handle
+ * @param device path to device
*
- * CRYPT_RNG_URANDOM - use /dev/urandom
- * CRYPT_RNG_RANDOM - use /dev/random (waits if no entropy in system)
*/
+int crypt_set_data_device(struct crypt_device *cd, const char *device);
+
+/**
+ * @defgroup rng "Cryptsetup RNG"
+ *
+ * @addtogroup rng
+ * @{
+ *
+ */
+
+/** CRYPT_RNG_URANDOM - use /dev/urandom */
#define CRYPT_RNG_URANDOM 0
+/** CRYPT_RNG_RANDOM - use /dev/random (waits if no entropy in system) */
#define CRYPT_RNG_RANDOM 1
+
+/**
+ * Set which RNG (random number generator) is used for generating long term key
+ *
+ * @param cd crypt device handle
+ * @param rng_type kernel random number generator to use
+ *
+ */
void crypt_set_rng_type(struct crypt_device *cd, int rng_type);
/**
* Get which RNG (random number generator) is used for generating long term key
*
- * Returns RNG type on success or negative errno value otherwise.
+ * @param cd crypt device handle
+ * @return RNG type on success or negative errno value otherwise.
*
- * @cd - crypt device handle
*/
int crypt_get_rng_type(struct crypt_device *cd);
+/** @} */
+
/**
* Helper to lock/unlock memory to avoid swap sensitive data to disk
*
- * @cd - crypt device handle, can be NULL
- * @lock - 0 to unloct otherwise lock memory
+ * @param cd crypt device handle, can be @e NULL
+ * @param lock 0 to unlock otherwise lock memory
+ *
+ * @returns Value indicating whether the memory is locked (function can be called multiple times).
*
- * Return value indicates that memory is locked (function can be called multiple times).
- * Only root can do this. Note it locks/unlocks all process memory, not only crypt context.
+ * @note Only root can do this.
+ * @note It locks/unlocks all process memory, not only crypt context.
*/
int crypt_memory_lock(struct crypt_device *cd, int lock);
-#define CRYPT_PLAIN "PLAIN" /* regular crypt device, no on-disk header */
-#define CRYPT_LUKS1 "LUKS1" /* LUKS version 1 header on-disk */
-#define CRYPT_LOOPAES "LOOPAES" /* loop-AES compatibility mode */
+/**
+ * @defgroup crypt_type "Cryptsetup on-disk format types"
+ *
+ * Set of functions, \#defines and structs related
+ * to on-disk format types
+ */
+
+/**
+ * @addtogroup crypt_type
+ * @{
+ */
+
+/** plain crypt device, no on-disk header */
+#define CRYPT_PLAIN "PLAIN"
+/** LUKS version 1 header on-disk */
+#define CRYPT_LUKS1 "LUKS1"
+/** loop-AES compatibility mode */
+#define CRYPT_LOOPAES "LOOPAES"
+/** dm-verity mode */
+#define CRYPT_VERITY "VERITY"
+/** TCRYPT (TrueCrypt-compatible) mode */
+#define CRYPT_TCRYPT "TCRYPT"
/**
* Get device type
*
- * @cd - crypt device handle
- *
- * Returns string according to device type or NULL if not known.
+ * @param cd crypt device handle
+ * @return string according to device type or @e NULL if not known.
*/
const char *crypt_get_type(struct crypt_device *cd);
+/**
+ *
+ * Structure used as parameter for PLAIN device type
+ *
+ * @see crypt_format
+ */
struct crypt_params_plain {
- const char *hash; /* password hash function */
- uint64_t offset; /* offset in sectors */
- uint64_t skip; /* IV offset / initialisation sector */
- uint64_t size; /* size of mapped device or 0 for autodetection */
+ const char *hash; /**< password hash function */
+ uint64_t offset; /**< offset in sectors */
+ uint64_t skip; /**< IV offset / initialization sector */
+ uint64_t size; /**< size of mapped device or @e 0 for autodetection */
};
+/**
+ * Structure used as parameter for LUKS device type
+ *
+ * @see crypt_format, crypt_load
+ *
+ * @note during crypt_format @e data_device attribute determines
+ * if the LUKS header is separated from encrypted payload device
+ *
+ */
struct crypt_params_luks1 {
- const char *hash; /* hash used in LUKS header */
- size_t data_alignment; /* in sectors, data offset is multiple of this */
+ const char *hash; /**< hash used in LUKS header */
+ size_t data_alignment; /**< data alignment in sectors, data offset is multiple of this */
+ const char *data_device; /**< detached encrypted data device or @e NULL */
};
+/**
+ *
+ * Structure used as parameter for loop-AES device type
+ *
+ * @see crypt_format
+ *
+ */
struct crypt_params_loopaes {
- const char *hash; /* key hash function */
- uint64_t offset; /* offset in sectors */
- uint64_t skip; /* IV offset / initialisation sector */
+ const char *hash; /**< key hash function */
+ uint64_t offset; /**< offset in sectors */
+ uint64_t skip; /**< IV offset / initialization sector */
};
+
+/**
+ *
+ * Structure used as parameter for dm-verity device type
+ *
+ * @see crypt_format, crypt_load
+ *
+ */
+/** No on-disk header (only hashes) */
+#define CRYPT_VERITY_NO_HEADER (1 << 0)
+/** Verity hash in userspace before activation */
+#define CRYPT_VERITY_CHECK_HASH (1 << 1)
+/** Create hash - format hash device */
+#define CRYPT_VERITY_CREATE_HASH (1 << 2)
+
+struct crypt_params_verity {
+ const char *hash_name; /**< hash function */
+ const char *data_device; /**< data_device (CRYPT_VERITY_CREATE_HASH) */
+ const char *hash_device; /**< hash_device (output only) */
+ const char *salt; /**< salt */
+ uint32_t salt_size; /**< salt size (in bytes) */
+ uint32_t hash_type; /**< in-kernel hashing type */
+ uint32_t data_block_size; /**< data block size (in bytes) */
+ uint32_t hash_block_size; /**< hash block size (in bytes) */
+ uint64_t data_size; /**< data area size (in data blocks) */
+ uint64_t hash_area_offset; /**< hash/header offset (in bytes) */
+ uint32_t flags; /**< CRYPT_VERITY* flags */
+};
+
+/**
+ *
+ * Structure used as parameter for TCRYPT device type
+ *
+ * @see crypt_format
+ *
+ */
+/** Include legacy modes ehn scannig for header*/
+#define CRYPT_TCRYPT_LEGACY_MODES (1 << 0)
+/** Try to load hidden header (describing hidden device) */
+#define CRYPT_TCRYPT_HIDDEN_HEADER (1 << 1)
+/** Try to load backup header */
+#define CRYPT_TCRYPT_BACKUP_HEADER (1 << 2)
+
+struct crypt_params_tcrypt {
+ const char *passphrase; /**< passphrase to unlock header (input only) */
+ size_t passphrase_size; /**< passphrase size (input only) */
+ const char **keyfiles; /**< keyfile paths to unlock header (input only) */
+ unsigned int keyfiles_count;/**< keyfiles count (input only) */
+ const char *hash_name; /**< hash function for PBKDF */
+ const char *cipher; /**< cipher chain c1[-c2[-c3]] */
+ const char *mode; /**< cipher block mode */
+ size_t key_size; /**< key size in bytes (the whole chain) */
+ uint32_t flags; /**< CRYPT_TCRYPT* flags */
+};
+
+/** @} */
+
/**
* Create (format) new crypt device (and possible header on-disk) but not activates it.
*
- * Returns 0 on success or negative errno value otherwise.
+ * @pre @e cd contains initialized and not formatted device context (device type must @b not be set)
+ *
+ * @param cd crypt device handle
+ * @param type type of device (optional params struct must be of this type)
+ * @param cipher (e.g. "aes")
+ * @param cipher_mode including IV specification (e.g. "xts-plain")
+ * @param uuid requested UUID or @e NULL if it should be generated
+ * @param volume_key pre-generated volume key or @e NULL if it should be generated (only for LUKS)
+ * @param volume_key_size size of volume key in bytes.
+ * @param params crypt type specific parameters (see @link crypt_type @endlink)
*
- * @cd - crypt device handle
- * @type - type of device (optional params struct must be of this type)
- * @cipher - (e.g. "aes")
- * @cipher_mode - including IV specification (e.g. "xts-plain")
- * @uuid - requested UUID or NULL if it should be generated
- * @volume_key - pre-generated volume key or NULL if it should be generated (only for LUKS)
- * @volume_key_size - size of volume key in bytes.
- * @params - crypt type specific parameters
+ * @returns @e 0 on success or negative errno value otherwise.
*
- * Note that crypt_format does not enable any keyslot, but it stores volume key internally
- * and subsequent crypt_keyslot_add_* calls can be used.
+ * @note Note that crypt_format does not enable any keyslot (in case of work with LUKS device),
+ * but it stores volume key internally and subsequent crypt_keyslot_add_* calls can be used.
+ * @note For VERITY @link crypt_type @endlink, only uuid parameter is used, others paramaters
+ * are ignored and verity specific attributes are set through mandatory params option.
*/
int crypt_format(struct crypt_device *cd,
const char *type,
void *params);
/**
- * Set new UUID for already existing device (if format supports it)
+ * Set new UUID for already existing device
*
- * Returns 0 on success or negative errno value otherwise.
+ * @param cd crypt device handle
+ * @param uuid requested UUID or @e NULL if it should be generated
*
- * @cd - crypt device handle
- * @uuid - requested UUID or NULL if it should be generated
+ * @returns 0 on success or negative errno value otherwise.
+ *
+ * @note Currently, only LUKS device type are supported
*/
int crypt_set_uuid(struct crypt_device *cd,
const char *uuid);
/**
* Load crypt device parameters from on-disk header
*
- * Returns 0 on success or negative errno value otherwise.
+ * @param cd crypt device handle
+ * @param requested_type @link crypt_type @endlink or @e NULL for all known
+ * @param params crypt type specific parameters (see @link crypt_type @endlink)
+ *
+ * @returns 0 on success or negative errno value otherwise.
+ *
+ * @post In case LUKS header is read successfully but payload device is too small
+ * error is returned and device type in context is set to @e NULL
+ *
+ * @note Note that in current version load works only for LUKS and VERITY device type.
*
- * @cd - crypt device handle
- * @requested_type - use NULL for all known
- * @params - crypt type specific parameters
*/
int crypt_load(struct crypt_device *cd,
const char *requested_type,
void *params);
/**
+ * Try to repair crypt device on-disk header if invalid
+ *
+ * @param cd crypt device handle
+ * @param requested_type @link crypt_type @endlink or @e NULL for all known
+ * @param params crypt type specific parameters (see @link crypt_type @endlink)
+ *
+ * @returns 0 on success or negative errno value otherwise.
+ *
+ */
+int crypt_repair(struct crypt_device *cd,
+ const char *requested_type,
+ void *params);
+
+/**
* Resize crypt device
*
- * Returns 0 on success or negative errno value otherwise.
+ * @param cd - crypt device handle
+ * @param name - name of device to resize
+ * @param new_size - new device size in sectors or @e 0 to use all of the underlying device size
*
- * @cd - crypt device handle
- * @name - name of device to resize
- * @new_size - new device size in sectors or 0 to use underlying device size
+ * @return @e 0 on success or negative errno value otherwise.
*/
int crypt_resize(struct crypt_device *cd,
const char *name,
/**
* Suspends crypt device.
*
- * Returns 0 on success or negative errno value otherwise.
+ * @param cd crypt device handle, can be @e NULL
+ * @param name name of device to suspend
+ *
+ * @return 0 on success or negative errno value otherwise.
+ *
+ * @note Only LUKS device type is supported
*
- * @cd - crypt device handle, can be NULL
- * @name - name of device to suspend
*/
int crypt_suspend(struct crypt_device *cd,
const char *name);
/**
* Resumes crypt device using passphrase.
*
- * Returns unlocked key slot number or negative errno otherwise.
*
- * @cd - crypt device handle
- * @name - name of device to resume
- * @keyslot - requested keyslot or CRYPT_ANY_SLOT
- * @passphrase - passphrase used to unlock volume key, NULL for query
- * @passphrase_size - size of @passphrase (binary data)
+ * @param cd crypt device handle
+ * @param name name of device to resume
+ * @param keyslot requested keyslot or CRYPT_ANY_SLOT
+ * @param passphrase passphrase used to unlock volume key, @e NULL for query
+ * @param passphrase_size size of @e passphrase (binary data)
+ *
+ * @return unlocked key slot number or negative errno otherwise.
+ *
+ * @note Only LUKS device type is supported
*/
int crypt_resume_by_passphrase(struct crypt_device *cd,
- const char *name,
- int keyslot,
- const char *passphrase,
- size_t passphrase_size);
+ const char *name,
+ int keyslot,
+ const char *passphrase,
+ size_t passphrase_size);
/**
* Resumes crypt device using key file.
*
- * Returns unlocked key slot number or negative errno otherwise.
+ * @param cd crypt device handle
+ * @param name name of device to resume
+ * @param keyslot requested keyslot or CRYPT_ANY_SLOT
+ * @param keyfile key file used to unlock volume key, @e NULL for passphrase query
+ * @param keyfile_size number of bytes to read from keyfile, 0 is unlimited
+ * @param keyfile_offset number of bytes to skip at start of keyfile
*
- * @cd - crypt device handle
- * @name - name of device to resume
- * @keyslot - requested keyslot or CRYPT_ANY_SLOT
- * @keyfile - key file used to unlock volume key, NULL for passphrase query
- * @keyfile_size - number of bytes to read from @keyfile, 0 is unlimited
+ * @return unlocked key slot number or negative errno otherwise.
+ */
+int crypt_resume_by_keyfile_offset(struct crypt_device *cd,
+ const char *name,
+ int keyslot,
+ const char *keyfile,
+ size_t keyfile_size,
+ size_t keyfile_offset);
+/**
+ * Backward compatible crypt_resume_by_keyfile_offset() (without offset).
*/
int crypt_resume_by_keyfile(struct crypt_device *cd,
- const char *name,
- int keyslot,
- const char *keyfile,
- size_t keyfile_size);
+ const char *name,
+ int keyslot,
+ const char *keyfile,
+ size_t keyfile_size);
/**
* Releases crypt device context and used memory.
*
- * @cd - crypt device handle
+ * @param cd crypt device handle
*/
void crypt_free(struct crypt_device *cd);
/**
+ * @defgroup keyslot "Cryptsetup LUKS keyslots"
+ * @addtogroup keyslot
+ * @{
+ *
+ */
+
+/** iterate through all keyslots and find first one that fits */
+#define CRYPT_ANY_SLOT -1
+
+/**
* Add key slot using provided passphrase
*
- * Returns allocated key slot number or negative errno otherwise.
+ * @pre @e cd contains initialized and formatted LUKS device context
+ *
+ * @param cd crypt device handle
+ * @param keyslot requested keyslot or @e CRYPT_ANY_SLOT
+ * @param passphrase passphrase used to unlock volume key, @e NULL for query
+ * @param passphrase_size size of passphrase (binary data)
+ * @param new_passphrase passphrase for new keyslot, @e NULL for query
+ * @param new_passphrase_size size of @e new_passphrase (binary data)
*
- * @cd - crypt device handle
- * @keyslot - requested keyslot or CRYPT_ANY_SLOT
- * @passphrase - passphrase used to unlock volume key, NULL for query
- * @passphrase_size - size of @passphrase (binary data)
- * @new_passphrase - passphrase for new keyslot, NULL for query
- * @new_passphrase_size - size of @new_passphrase (binary data)
+ * @return allocated key slot number or negative errno otherwise.
*/
-#define CRYPT_ANY_SLOT -1
int crypt_keyslot_add_by_passphrase(struct crypt_device *cd,
int keyslot,
const char *passphrase,
size_t new_passphrase_size);
/**
- * Get number of keyslots supported for device type.
+ * Change defined key slot using provided passphrase
*
- * Returns slot count or negative errno otherwise if device
- * doesn't not support keyslots.
+ * @pre @e cd contains initialized and formatted LUKS device context
+ *
+ * @param cd crypt device handle
+ * @param keyslot_old old keyslot or @e CRYPT_ANY_SLOT
+ * @param keyslot_new new keyslot (can be the same as old)
+ * @param passphrase passphrase used to unlock volume key, @e NULL for query
+ * @param passphrase_size size of passphrase (binary data)
+ * @param new_passphrase passphrase for new keyslot, @e NULL for query
+ * @param new_passphrase_size size of @e new_passphrase (binary data)
*
- * @type - crypt device type
+ * @return allocated key slot number or negative errno otherwise.
+ *
+ * @note This function is just internal implementation of luksChange
+ * command to avoid reading of volume key outside libcryptsetup boundary
+ * in FIPS mode.
*/
-int crypt_keyslot_max(const char *type);
+int crypt_keyslot_change_by_passphrase(struct crypt_device *cd,
+ int keyslot_old,
+ int keyslot_new,
+ const char *passphrase,
+ size_t passphrase_size,
+ const char *new_passphrase,
+ size_t new_passphrase_size);
/**
* Add key slot using provided key file path
*
- * Returns allocated key slot number or negative errno otherwise.
+ * @pre @e cd contains initialized and formatted LUKS device context
+ *
+ * @param cd crypt device handle
+ * @param keyslot requested keyslot or @e CRYPT_ANY_SLOT
+ * @param keyfile key file used to unlock volume key, @e NULL for passphrase query
+ * @param keyfile_size number of bytes to read from keyfile, @e 0 is unlimited
+ * @param keyfile_offset number of bytes to skip at start of keyfile
+ * @param new_keyfile keyfile for new keyslot, @e NULL for passphrase query
+ * @param new_keyfile_size number of bytes to read from @e new_keyfile, @e 0 is unlimited
+ * @param new_keyfile_offset number of bytes to skip at start of new_keyfile
*
- * @cd - crypt device handle
- * @keyslot - requested keyslot or CRYPT_ANY_SLOT
- * @keyfile - key file used to unlock volume key, NULL for passphrase query
- * @keyfile_size - number of bytes to read from @keyfile, 0 is unlimited
- * @new_keyfile - keyfile for new keyslot, NULL for passphrase query
- * @new_keyfile_size - number of bytes to read from @new_keyfile, 0 is unlimited
+ * @return allocated key slot number or negative errno otherwise.
*
- * Note that @keyfile can be "-" for STDIN
+ * @note Note that @e keyfile can be "-" for STDIN
+ *
+ */
+int crypt_keyslot_add_by_keyfile_offset(struct crypt_device *cd,
+ int keyslot,
+ const char *keyfile,
+ size_t keyfile_size,
+ size_t keyfile_offset,
+ const char *new_keyfile,
+ size_t new_keyfile_size,
+ size_t new_keyfile_offset);
+/**
+ * Backward compatible crypt_keyslot_add_by_keyfile_offset() (without offset).
*/
int crypt_keyslot_add_by_keyfile(struct crypt_device *cd,
int keyslot,
/**
* Add key slot using provided volume key
*
- * Returns allocated key slot number or negative errno otherwise.
+ * @pre @e cd contains initialized and formatted LUKS device context
+ *
+ * @param cd crypt device handle
+ * @param keyslot requested keyslot or CRYPT_ANY_SLOT
+ * @param volume_key provided volume key or @e NULL if used after crypt_format
+ * @param volume_key_size size of volume_key
+ * @param passphrase passphrase for new keyslot, @e NULL for query
+ * @param passphrase_size size of passphrase
+ *
+ * @return allocated key slot number or negative errno otherwise.
*
- * @cd - crypt device handle
- * @keyslot - requested keyslot or CRYPT_ANY_SLOT
- * @volume_key - provided volume key or NULL if used after crypt_format
- * @volume_key_size - size of @volume_key
- * @passphrase - passphrase for new keyslot, NULL for query
- * @passphrase_size - size of @passphrase
*/
int crypt_keyslot_add_by_volume_key(struct crypt_device *cd,
int keyslot,
/**
* Destroy (and disable) key slot
*
- * Returns 0 on success or negative errno value otherwise.
+ * @pre @e cd contains initialized and formatted LUKS device context
*
- * @cd - crypt device handle
- * @keyslot - requested key slot to destroy
+ * @param cd crypt device handle
+ * @param keyslot requested key slot to destroy
*
- * Note that there is no passphrase verification used.
+ * @return @e 0 on success or negative errno value otherwise.
+ *
+ * @note Note that there is no passphrase verification used.
*/
int crypt_keyslot_destroy(struct crypt_device *cd, int keyslot);
+/** @} */
+
/**
+ * @defgroup aflags "Device runtime attributes"
+ *
* Activation flags
+ *
+ * @addtogroup aflags
+ * @{
+ *
*/
+/** device is read only */
#define CRYPT_ACTIVATE_READONLY (1 << 0)
-#define CRYPT_ACTIVATE_NO_UUID (1 << 1) /* ignored */
+/** only reported for device without uuid */
+#define CRYPT_ACTIVATE_NO_UUID (1 << 1)
+/** activate even if cannot grant exclusive access (DANGEROUS) */
#define CRYPT_ACTIVATE_SHARED (1 << 2)
-#define CRYPT_ACTIVATE_ALLOW_DISCARDS (1 << 3) /* enable discards aka TRIM */
+/** enable discards aka TRIM */
+#define CRYPT_ACTIVATE_ALLOW_DISCARDS (1 << 3)
+/** skip global udev rules in activation ("private device"), input only */
+#define CRYPT_ACTIVATE_PRIVATE (1 << 4)
+/** corruption detected (verity), output only */
+#define CRYPT_ACTIVATE_CORRUPTED (1 << 5)
/**
* Active device runtime attributes
*/
struct crypt_active_device {
- uint64_t offset; /* offset in sectors */
- uint64_t iv_offset; /* IV initilisation sector */
- uint64_t size; /* active device size */
- uint32_t flags; /* activation flags */
+ uint64_t offset; /**< offset in sectors */
+ uint64_t iv_offset; /**< IV initialization sector */
+ uint64_t size; /**< active device size */
+ uint32_t flags; /**< activation flags */
};
/**
* Receives runtime attributes of active crypt device
*
- * Returns 0 on success or negative errno value otherwise.
+ * @param cd crypt device handle (can be @e NULL)
+ * @param name name of active device
+ * @param cad preallocated active device attributes to fill
+ *
+ * @return @e 0 on success or negative errno value otherwise
*
- * @cd - crypt device handle (can be NULL)
- * @name - name of active device
- * @cad - preallocated active device attributes to fill
*/
int crypt_get_active_device(struct crypt_device *cd,
const char *name,
struct crypt_active_device *cad);
+/** @} */
+
/**
* Activate device or check passphrase
*
- * Returns unlocked key slot number or negative errno otherwise.
+ * @param cd crypt device handle
+ * @param name name of device to create, if @e NULL only check passphrase
+ * @param keyslot requested keyslot to check or @e CRYPT_ANY_SLOT
+ * @param passphrase passphrase used to unlock volume key, @e NULL for query
+ * @param passphrase_size size of @e passphrase
+ * @param flags activation flags
*
- * @cd - crypt device handle
- * @name - name of device to create, if NULL only check passphrase
- * @keyslot - requested keyslot to check or CRYPT_ANY_SLOT
- * @passphrase - passphrase used to unlock volume key, NULL for query
- * @passphrase_size - size of @passphrase
- * @flags - activation flags
+ * @return unlocked key slot number or negative errno otherwise.
*/
int crypt_activate_by_passphrase(struct crypt_device *cd,
const char *name,
/**
* Activate device or check using key file
*
- * Returns unlocked key slot number or negative errno otherwise.
+ * @param cd crypt device handle
+ * @param name name of device to create, if @e NULL only check keyfile
+ * @param keyslot requested keyslot to check or CRYPT_ANY_SLOT
+ * @param keyfile key file used to unlock volume key
+ * @param keyfile_size number of bytes to read from keyfile, 0 is unlimited
+ * @param keyfile_offset number of bytes to skip at start of keyfile
+ * @param flags activation flags
*
- * @cd - crypt device handle
- * @name - name of device to create, if NULL only check keyfile
- * @keyslot - requested keyslot to check or CRYPT_ANY_SLOT
- * @keyfile - key file used to unlock volume key
- * @keyfile_size - number of bytes to read from @keyfile, 0 is unlimited
- * @flags - activation flags
+ * @return unlocked key slot number or negative errno otherwise.
+ */
+int crypt_activate_by_keyfile_offset(struct crypt_device *cd,
+ const char *name,
+ int keyslot,
+ const char *keyfile,
+ size_t keyfile_size,
+ size_t keyfile_offset,
+ uint32_t flags);
+/**
+ * Backward compatible crypt_activate_by_keyfile_offset() (without offset).
*/
int crypt_activate_by_keyfile(struct crypt_device *cd,
const char *name,
/**
* Activate device using provided volume key
*
- * Returns 0 on success or negative errno value otherwise.
*
- * @cd - crypt device handle
- * @name - name of device to create, if NULL only check volume key
- * @volume_key - provided volume key (or NULL to use internal)
- * @volume_key_size - size of @volume_key
- * @flags - activation flags
+ * @param cd crypt device handle
+ * @param name name of device to create, if @e NULL only check volume key
+ * @param volume_key provided volume key (or @e NULL to use internal)
+ * @param volume_key_size size of volume_key
+ * @param flags activation flags
+ *
+ * @return @e 0 on success or negative errno value otherwise.
*
- * If NULL is used for volume_key, device has to be initialized
- * by previous operation (like crypt_format() or crypt_init_by_name())
+ * @note If @e NULL is used for volume_key, device has to be initialized
+ * by previous operation (like @ref crypt_format
+ * or @ref crypt_init_by_name)
+ * @note For VERITY the volume key means root hash required for activation.
+ * Because kernel dm-verity is always read only, you have to provide
+ * CRYPT_ACTIVATE_READONLY flag always.
+ * @note For TCRYPT the volume key should be always NULL and because master
+ * key from decrypted header is used instead.
*/
int crypt_activate_by_volume_key(struct crypt_device *cd,
const char *name,
uint32_t flags);
/**
- * Deactivate crypt device
+ * Deactivate crypt device. This function tries to remove active device-mapper
+ * mapping from kernel. Also, sensitive data like the volume key are removed from
+ * memory
*
- * @cd - crypt device handle, can be NULL
- * @name - name of device to deactivate
- */
+ * @param cd crypt device handle, can be @e NULL
+ * @param name name of device to deactivate
+ *
+ * @return @e 0 on success or negative errno value otherwise.
+ *
+ */
int crypt_deactivate(struct crypt_device *cd, const char *name);
/**
* Get volume key from of crypt device
*
- * Returns unlocked key slot number or negative errno otherwise.
+ * @param cd crypt device handle
+ * @param keyslot use this keyslot or @e CRYPT_ANY_SLOT
+ * @param volume_key buffer for volume key
+ * @param volume_key_size on input, size of buffer @e volume_key,
+ * on output size of @e volume_key
+ * @param passphrase passphrase used to unlock volume key
+ * @param passphrase_size size of @e passphrase
+ *
+ * @return unlocked key slot number or negative errno otherwise.
*
- * @cd - crypt device handle
- * @keyslot - use this keyslot or CRYPT_ANY_SLOT
- * @volume_key - buffer for volume key
- * @volume_key_size - on input, size of buffer @volume_key,
- * on output size of @volume_key
- * @passphrase - passphrase used to unlock volume key, NULL for query
- * @passphrase_size - size of @passphrase
+ * @note For TCRYPT cipher chain is the volume key concatenated
+ * for all ciphers in chain.
*/
int crypt_volume_key_get(struct crypt_device *cd,
int keyslot,
/**
* Verify that provided volume key is valid for crypt device
*
- * Returns 0 on success or negative errno value otherwise.
+ * @param cd crypt device handle
+ * @param volume_key provided volume key
+ * @param volume_key_size size of @e volume_key
*
- * @cd - crypt device handle
- * @volume_key - provided volume key
- * @volume_key_size - size of @volume_key
+ * @return @e 0 on success or negative errno value otherwise.
*/
int crypt_volume_key_verify(struct crypt_device *cd,
const char *volume_key,
size_t volume_key_size);
/**
+ * @defgroup devstat "Crypt and Verity device status"
+ * @addtogroup devstat
+ * @{
+ */
+
+/**
+ * Device status
+ */
+typedef enum {
+ CRYPT_INVALID, /**< device mapping is invalid in this context */
+ CRYPT_INACTIVE, /**< no such mapped device */
+ CRYPT_ACTIVE, /**< device is active */
+ CRYPT_BUSY /**< device is active and has open count > 0 */
+} crypt_status_info;
+
+/**
* Get status info about device name
*
- * Returns value defined by crypt_status_info.
+ * @param cd crypt device handle, can be @e NULL
+ * @param name crypt device name
*
- * @cd - crypt device handle, can be NULL
- * @name -crypt device name
+ * @return value defined by crypt_status_info.
*
- * CRYPT_INACTIVE - no such mapped device
- * CRYPT_ACTIVE - device is active
- * CRYPT_BUSY - device is active and has open count > 0
*/
-typedef enum {
- CRYPT_INVALID,
- CRYPT_INACTIVE,
- CRYPT_ACTIVE,
- CRYPT_BUSY
-} crypt_status_info;
crypt_status_info crypt_status(struct crypt_device *cd, const char *name);
/**
- * Dump text-formatted information about crypt device to log output
+ * Dump text-formatted information about crypt or verity device to log output
*
- * Returns 0 on success or negative errno value otherwise.
+ * @param cd crypt device handle
*
- * @cd - crypt device handle
+ * @return @e 0 on success or negative errno value otherwise.
*/
int crypt_dump(struct crypt_device *cd);
/**
- * Various crypt device info functions
+ * Informational benchmark for ciphers
+ *
+ * @param cd crypt device handle
+ * @param cipher (e.g. "aes")
+ * @param cipher_mode (e.g. "xts"), IV generator is ignored
+ * @param volume_key_size size of volume key in bytes
+ * @param iv_size size of IV in bytes
+ * @param buffer_size size of encryption buffer in bytes used in test
+ * @param encryption_mbs measured encryption speed in MiB/s
+ * @param decryption_mbs measured decryption speed in MiB/s
+ *
+ * @return @e 0 on success or negative errno value otherwise.
+ */
+int crypt_benchmark(struct crypt_device *cd,
+ const char *cipher,
+ const char *cipher_mode,
+ size_t volume_key_size,
+ size_t iv_size,
+ size_t buffer_size,
+ double *encryption_mbs,
+ double *decryption_mbs);
+
+int crypt_benchmark_kdf(struct crypt_device *cd,
+ const char *kdf,
+ const char *hash,
+ const char *password,
+ size_t password_size,
+ const char *salt,
+ size_t salt_size,
+ uint64_t *iterations_sec);
+
+/**
+ * Get cipher used in device
+ *
+ * @param cd crypt device handle
*
- * @cd - crypt device handle
+ * @return used cipher, e.g. "aes" or @e NULL otherwise
*
- * cipher - used cipher, e.g. "aes" or NULL otherwise
- * cipher_mode - used cipher mode including IV, e.g. "xts-plain" or NULL otherwise
- * uuid - device UUID or NULL if not set
- * device_name - underlying device name or NULL if not yet set
- * data_offset - device offset in sectors where real data starts on underlying device)
- * iv_offset - IV offset in sectors (skip)
- * volume_key_size - size (in bytes) of volume key for crypt device
*/
const char *crypt_get_cipher(struct crypt_device *cd);
+
+/**
+ * Get cipher mode used in device
+ *
+ * @param cd crypt device handle
+ *
+ * @return used cipher mode e.g. "xts-plain" or @e otherwise
+ *
+ */
const char *crypt_get_cipher_mode(struct crypt_device *cd);
+
+/**
+ * Get device UUID
+ *
+ * @param cd crypt device handle
+ *
+ * @return device UUID or @e NULL if not set
+ *
+ */
const char *crypt_get_uuid(struct crypt_device *cd);
+
+/**
+ * Get path to underlaying device
+ *
+ * @param cd crypt device handle
+ *
+ * @return path to underlaying device name
+ *
+ */
const char *crypt_get_device_name(struct crypt_device *cd);
+
+/**
+ * Get device offset in sectors where real data starts on underlying device)
+ *
+ * @param cd crypt device handle
+ *
+ * @return device offset in sectors
+ *
+ */
uint64_t crypt_get_data_offset(struct crypt_device *cd);
+
+/**
+ * Get IV offset in sectors (skip)
+ *
+ * @param cd crypt device handle
+ *
+ * @return IV offset
+ *
+ */
uint64_t crypt_get_iv_offset(struct crypt_device *cd);
+
+/**
+ * Get size (in bytes) of volume key for crypt device
+ *
+ * @param cd crypt device handle
+ *
+ * @return volume key size
+ *
+ */
int crypt_get_volume_key_size(struct crypt_device *cd);
/**
- * Get information about particular key slot
+ * Get device parameters for VERITY device
+ *
+ * @param cd crypt device handle
+ * @param vp verity device info
*
- * Returns value defined by crypt_keyslot_info.
+ * @e 0 on success or negative errno value otherwise.
*
- * @cd - crypt device handle
- * @keyslot - requested keyslot to check or CRYPT_ANY_SLOT
+ */
+int crypt_get_verity_info(struct crypt_device *cd,
+ struct crypt_params_verity *vp);
+/** @} */
+
+/**
+ * @addtogroup keyslot
+ * @{
+ *
+ */
+
+/**
+ * Crypt keyslot info
*/
typedef enum {
- CRYPT_SLOT_INVALID,
- CRYPT_SLOT_INACTIVE,
- CRYPT_SLOT_ACTIVE,
- CRYPT_SLOT_ACTIVE_LAST
+ CRYPT_SLOT_INVALID, /**< invalid keyslot */
+ CRYPT_SLOT_INACTIVE, /**< keyslot is inactive (free) */
+ CRYPT_SLOT_ACTIVE, /**< keyslot is active (used) */
+ CRYPT_SLOT_ACTIVE_LAST /**< keylost is active (used)
+ * and last used at the same time */
} crypt_keyslot_info;
+
+/**
+ * Get information about particular key slot
+ *
+ *
+ * @param cd crypt device handle
+ * @param keyslot requested keyslot to check or CRYPT_ANY_SLOT
+ *
+ * @return value defined by crypt_keyslot_info
+ *
+ */
crypt_keyslot_info crypt_keyslot_status(struct crypt_device *cd, int keyslot);
+/** @} */
+
+/**
+ * Get number of keyslots supported for device type.
+ *
+ * @param type crypt device type
+ *
+ * @return slot count or negative errno otherwise if device
+ * doesn't not support keyslots.
+ */
+int crypt_keyslot_max(const char *type);
+
+/**
+ * Get keyslot area pointers (relative to metadata device)
+ *
+ * @param cd crypt device handle
+ * @param keyslot keyslot number
+ * @param offset offset on metadata device (in bytes)
+ * @param length length of keyslot area (in bytes)
+ *
+ * @return @e 0 on success or negative errno value otherwise.
+ *
+ */
+int crypt_keyslot_area(struct crypt_device *cd,
+ int keyslot,
+ uint64_t *offset,
+ uint64_t *length);
/**
* Backup header and keyslots to file
*
- * Returns 0 on success or negative errno value otherwise.
+ * @param cd crypt device handle
+ * @param requested_type @link crypt_type @endlink or @e NULL for all known
+ * @param backup_file file to backup header to
+ *
+ * @return @e 0 on success or negative errno value otherwise.
*
- * @cd - crypt device handle
- * @requested_type - type of header to backup
- * @backup_file - file to backup header to
*/
int crypt_header_backup(struct crypt_device *cd,
const char *requested_type,
/**
* Restore header and keyslots from backup file
*
- * Returns 0 on success or negative errno value otherwise.
*
- * @cd - crypt device handle
- * @requested_type - type of header to restore
- * @backup_file - file to restore header from
+ * @param cd crypt device handle
+ * @param requested_type @link crypt_type @endlink or @e NULL for all known
+ * @param backup_file file to restore header from
+ *
+ * @return @e 0 on success or negative errno value otherwise.
+ *
*/
int crypt_header_restore(struct crypt_device *cd,
const char *requested_type,
/**
* Receives last reported error
*
- * @buf - buffef for message
- * @size - size of buffer
+ * @param cd crypt device handle
+ * @param buf buffef for message
+ * @param size size of buffer
*
- * Note that this is old API function using global context.
+ * @note Note that this is old API function using global context.
+ * All error messages are reported also through log callback.
+ */
+void crypt_last_error(struct crypt_device *cd, char *buf, size_t size);
+
+/**
+ * Receives last reported error, DEPRECATED
+ *
+ * @param buf buffef for message
+ * @param size size of buffer
+ *
+ * @note Note that this is old API function using global context.
* All error messages are reported also through log callback.
*/
void crypt_get_error(char *buf, size_t size);
/**
* Get directory where mapped crypt devices are created
+ *
+ * @return the directory path
*/
const char *crypt_get_dir(void);
/**
+ * @defgroup dbg "Library debug level"
+ *
* Set library debug level
+ *
+ * @addtogroup dbg
+ * @{
*/
+
+/** Debug all */
#define CRYPT_DEBUG_ALL -1
+/** Debug none */
#define CRYPT_DEBUG_NONE 0
+
+/**
+ * Set the debug level for library
+ *
+ * @param level debug level
+ *
+ */
void crypt_set_debug_level(int level);
+/** @} */
+
#ifdef __cplusplus
}
#endif
projects / platform / upstream / cryptsetup.git / blobdiff