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Diffstat (limited to 'lib/libcryptsetup.h')
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diff --git a/lib/libcryptsetup.h b/lib/libcryptsetup.h new file mode 100644 index 0000000..955aab2 --- /dev/null +++ b/lib/libcryptsetup.h @@ -0,0 +1,2104 @@ +/* + * libcryptsetup - cryptsetup library + * + * Copyright (C) 2004 Jana Saout <jana@saout.de> + * Copyright (C) 2004-2007 Clemens Fruhwirth <clemens@endorphin.org> + * Copyright (C) 2009-2019 Red Hat, Inc. All rights reserved. + * Copyright (C) 2009-2019 Milan Broz + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * 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> + +/** + * @defgroup crypt-init Cryptsetup device context initialization + * Set of functions for creating and destroying @e crypt_device context + * @addtogroup crypt-init + * @{ + */ + +struct crypt_device; /* crypt device handle */ + +/** + * Initialize crypt device handle and check if the provided device exists. + * + * @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. + * + * @return @e 0 on success or negative errno value otherwise. + * + * @note Note that logging is not initialized here, possible messages use + * default log function. + */ +int crypt_init(struct crypt_device **cd, const char *device); + +/** + * Initialize crypt device handle with optional data device and check + * if devices exist. + * + * @param cd Returns pointer to crypt device handle + * @param device Path to the backing device or detached header. + * @param data_device Path to the data device or @e NULL. + * + * @return @e 0 on success or negative errno value otherwise. + * + * @note Note that logging is not initialized here, possible messages use + * default log function. + */ +int crypt_init_data_device(struct crypt_device **cd, + const char *device, + const char *data_device); + +/** + * Initialize crypt device handle from provided active device name, + * and, optionally, from separate metadata (header) device + * and check if provided device exists. + * + * @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 + * + * @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); + +/** + * Release crypt device context and used memory. + * + * @param cd crypt device handle + */ +void crypt_free(struct crypt_device *cd); + +/** + * Set confirmation callback (yes/no). + * + * 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. + * + * @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 + * + * @note Current version of cryptsetup API requires confirmation for UUID change and + * LUKS header restore only. + */ +void crypt_set_confirm_callback(struct crypt_device *cd, + int (*confirm)(const char *msg, void *usrptr), + void *usrptr); + +/** + * 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 + * + * @returns 0 on success or negative errno value otherwise. + */ +int crypt_set_data_device(struct crypt_device *cd, const char *device); + +/** + * Set data device offset in 512-byte sectors. + * Used for LUKS. + * This function is replacement for data alignment fields in LUKS param struct. + * If set to 0 (default), old behaviour is preserved. + * This value is reset on @link crypt_load @endlink. + * + * @param cd crypt device handle + * @param data_offset data offset in bytes + * + * @returns 0 on success or negative errno value otherwise. + * + * @note Data offset must be aligned to multiple of 8 (alignment to 4096-byte sectors) + * and must be big enough to accommodate the whole LUKS header with all keyslots. + * @note Data offset is enforced by this function, device topology + * information is no longer used after calling this function. + */ +int crypt_set_data_offset(struct crypt_device *cd, uint64_t data_offset); + +/** @} */ + +/** + * @defgroup crypt-log Cryptsetup logging + * Set of functions and defines used in cryptsetup for + * logging purposes + * @addtogroup crypt-log + * @{ + */ + +/** normal log level */ +#define CRYPT_LOG_NORMAL 0 +/** error log level */ +#define CRYPT_LOG_ERROR 1 +/** verbose log level */ +#define CRYPT_LOG_VERBOSE 2 +/** debug log level - always on stdout */ +#define CRYPT_LOG_DEBUG -1 +/** debug log level - additional JSON output (for LUKS2) */ +#define CRYPT_LOG_DEBUG_JSON -2 + +/** + * 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); + +/** + * Defines log function or use the default one otherwise. + * + * @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); +/** @} */ + +/** + * @defgroup crypt-set Cryptsetup settings (RNG, PBKDF, locking) + * @addtogroup crypt-set + * @{ + */ + +/** 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. + * + * @param cd crypt device handle + * @return RNG type on success or negative errno value otherwise. + * + */ +int crypt_get_rng_type(struct crypt_device *cd); + +/** + * PBKDF parameters. + */ +struct crypt_pbkdf_type { + const char *type; /**< PBKDF algorithm */ + const char *hash; /**< Hash algorithm */ + uint32_t time_ms; /**< Requested time cost [milliseconds] */ + uint32_t iterations; /**< Iterations, 0 or benchmarked value. */ + uint32_t max_memory_kb; /**< Requested or benchmarked memory cost [kilobytes] */ + uint32_t parallel_threads;/**< Requested parallel cost [threads] */ + uint32_t flags; /**< CRYPT_PBKDF* flags */ +}; + +/** Iteration time set by crypt_set_iteration_time(), for compatibility only. */ +#define CRYPT_PBKDF_ITER_TIME_SET (1 << 0) +/** Never run benchmarks, use pre-set value or defaults. */ +#define CRYPT_PBKDF_NO_BENCHMARK (1 << 1) + +/** PBKDF2 according to RFC2898, LUKS1 legacy */ +#define CRYPT_KDF_PBKDF2 "pbkdf2" +/** Argon2i according to RFC */ +#define CRYPT_KDF_ARGON2I "argon2i" +/** Argon2id according to RFC */ +#define CRYPT_KDF_ARGON2ID "argon2id" + +/** + * Set default PBKDF (Password-Based Key Derivation Algorithm) for next keyslot + * about to get created with any crypt_keyslot_add_*() call. + * + * @param cd crypt device handle + * @param pbkdf PBKDF parameters + * + * @return 0 on success or negative errno value otherwise. + * + * @note For LUKS1, only PBKDF2 is supported, other settings will be rejected. + * @note For non-LUKS context types the call succeeds, but PBKDF is not used. + */ +int crypt_set_pbkdf_type(struct crypt_device *cd, + const struct crypt_pbkdf_type *pbkdf); + +/** + * Get PBKDF (Password-Based Key Derivation Algorithm) parameters. + * + * @param pbkdf_type type of PBKDF + * + * @return struct on success or NULL value otherwise. + * + */ +const struct crypt_pbkdf_type *crypt_get_pbkdf_type_params(const char *pbkdf_type); + +/** + * Get default PBKDF (Password-Based Key Derivation Algorithm) settings for keyslots. + * Works only with LUKS device handles (both versions). + * + * @param type type of device (see @link crypt-type @endlink) + * + * @return struct on success or NULL value otherwise. + * + */ +const struct crypt_pbkdf_type *crypt_get_pbkdf_default(const char *type); + +/** + * Get current PBKDF (Password-Based Key Derivation Algorithm) settings for keyslots. + * Works only with LUKS device handles (both versions). + * + * @param cd crypt device handle + * + * @return struct on success or NULL value otherwise. + * + */ +const struct crypt_pbkdf_type *crypt_get_pbkdf_type(struct crypt_device *cd); + +/** + * Set how long should cryptsetup iterate in PBKDF2 function. + * Default value heads towards the iterations which takes around 1 second. + * \b Deprecated, only for backward compatibility. + * Use @link crypt_set_pbkdf_type @endlink. + * + * @param cd crypt device handle + * @param iteration_time_ms the time in ms + * + * @note If the time value is not acceptable for active PBKDF, value is quietly ignored. + */ +void crypt_set_iteration_time(struct crypt_device *cd, uint64_t iteration_time_ms); + +/** + * Helper to lock/unlock memory to avoid swap sensitive data to disk. + * + * @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). + * + * @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); + +/** + * Set global lock protection for on-disk metadata (file-based locking). + * + * @param cd crypt device handle, can be @e NULL + * @param enable 0 to disable locking otherwise enable it (default) + * + * @returns @e 0 on success or negative errno value otherwise. + * + * @note Locking applied only for some metadata formats (LUKS2). + * @note The switch is global on the library level. + * In current version locking can be only switched off and cannot be switched on later. + */ +int crypt_metadata_locking(struct crypt_device *cd, int enable); + +/** + * Set metadata header area sizes. This applies only to LUKS2. + * These values limit amount of metadata anf number of supportable keyslots. + * + * @param cd crypt device handle, can be @e NULL + * @param metadata_size size in bytes of JSON area + 4k binary header + * @param keyslots_size size in bytes of binary keyslots area + * + * @returns @e 0 on success or negative errno value otherwise. + * + * @note The metadata area is stored twice and both copies contain 4k binary header. + * Only 16,32,64,128,256,512,1024,2048 and 4096 kB value is allowed (see LUKS2 specification). + * @note Keyslots area size must be multiple of 4k with maximum 128MB. + */ +int crypt_set_metadata_size(struct crypt_device *cd, + uint64_t metadata_size, + uint64_t keyslots_size); + +/** + * Get metadata header area sizes. This applies only to LUKS2. + * These values limit amount of metadata anf number of supportable keyslots. + * + * @param cd crypt device handle + * @param metadata_size size in bytes of JSON area + 4k binary header + * @param keyslots_size size in bytes of binary keyslots area + * + * @returns @e 0 on success or negative errno value otherwise. + */ +int crypt_get_metadata_size(struct crypt_device *cd, + uint64_t *metadata_size, + uint64_t *keyslots_size); + +/** @} */ + +/** + * @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" +/** LUKS version 2 header on-disk */ +#define CRYPT_LUKS2 "LUKS2" +/** loop-AES compatibility mode */ +#define CRYPT_LOOPAES "LOOPAES" +/** dm-verity mode */ +#define CRYPT_VERITY "VERITY" +/** TCRYPT (TrueCrypt-compatible and VeraCrypt-compatible) mode */ +#define CRYPT_TCRYPT "TCRYPT" +/** INTEGRITY dm-integrity device */ +#define CRYPT_INTEGRITY "INTEGRITY" + +/** LUKS any version */ +#define CRYPT_LUKS NULL + +/** + * Get device type + * + * @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); + +/** + * Get device default LUKS type + * + * @return string according to device type (CRYPT_LUKS1 or CRYPT_LUKS2). + */ +const char *crypt_get_default_type(void); + +/** + * + * 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 / initialization sector */ + uint64_t size; /**< size of mapped device or @e 0 for autodetection */ + uint32_t sector_size; /**< sector size in bytes (@e 0 means 512 for compatibility) */ +}; + +/** + * 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; /**< data area alignment in 512B 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 / initialization sector */ +}; + +/** + * + * Structure used as parameter for dm-verity device type. + * + * @see crypt_format, crypt_load + * + */ +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 *fec_device; /**< fec_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) */ + uint64_t fec_area_offset; /**< FEC/header offset (in bytes) */ + uint32_t fec_roots; /**< Reed-Solomon FEC roots */ + uint32_t flags; /**< CRYPT_VERITY* flags */ +}; + +/** 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) + +/** + * + * Structure used as parameter for TCRYPT device type. + * + * @see crypt_load + * + */ +struct crypt_params_tcrypt { + const char *passphrase; /**< passphrase to unlock header (input only) */ + size_t passphrase_size; /**< passphrase size (input only, max length is 64) */ + 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 */ + uint32_t veracrypt_pim; /**< VeraCrypt Personal Iteration Multiplier */ +}; + +/** Include legacy modes when scanning 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) +/** Device contains encrypted system (with boot loader) */ +#define CRYPT_TCRYPT_SYSTEM_HEADER (1 << 3) +/** Include VeraCrypt modes when scanning for header, + * all other TCRYPT flags applies as well. + * VeraCrypt device is reported as TCRYPT type. + */ +#define CRYPT_TCRYPT_VERA_MODES (1 << 4) + +/** + * + * Structure used as parameter for dm-integrity device type. + * + * @see crypt_format, crypt_load + * + */ +struct crypt_params_integrity { + uint64_t journal_size; /**< size of journal in bytes */ + unsigned int journal_watermark; /**< journal flush watermark in percents */ + unsigned int journal_commit_time; /**< journal commit time in ms */ + uint32_t interleave_sectors; /**< number of interleave sectors (power of two) */ + uint32_t tag_size; /**< tag size per-sector in bytes */ + uint32_t sector_size; /**< sector size in bytes */ + uint32_t buffer_sectors; /**< number of sectors in one buffer */ + const char *integrity; /**< integrity algorithm, NULL for LUKS2 */ + uint32_t integrity_key_size; /**< integrity key size in bytes, info only, 0 for LUKS2 */ + + const char *journal_integrity; /**< journal integrity algorithm */ + const char *journal_integrity_key; /**< journal integrity key, only for crypt_load */ + uint32_t journal_integrity_key_size; /**< journal integrity key size in bytes, only for crypt_load */ + + const char *journal_crypt; /**< journal encryption algorithm */ + const char *journal_crypt_key; /**< journal crypt key, only for crypt_load */ + uint32_t journal_crypt_key_size; /**< journal crypt key size in bytes, only for crypt_load */ +}; + +/** + * Structure used as parameter for LUKS2 device type. + * + * @see crypt_format, crypt_load + * + * @note during crypt_format @e data_device attribute determines + * if the LUKS2 header is separated from encrypted payload device + * + */ +struct crypt_params_luks2 { + const struct crypt_pbkdf_type *pbkdf; /**< PBKDF (and hash) parameters or @e NULL*/ + const char *integrity; /**< integrity algorithm or @e NULL */ + const struct crypt_params_integrity *integrity_params; /**< Data integrity parameters or @e NULL*/ + size_t data_alignment; /**< data area alignment in 512B sectors, data offset is multiple of this */ + const char *data_device; /**< detached encrypted data device or @e NULL */ + uint32_t sector_size; /**< encryption sector size */ + const char *label; /**< header label or @e NULL*/ + const char *subsystem; /**< header subsystem label or @e NULL*/ +}; +/** @} */ + +/** + * @defgroup crypt-actions Cryptsetup device context actions + * Set of functions for formatting and manipulating with specific crypt_type + * @addtogroup crypt-actions + * @{ + */ + +/** + * Create (format) new crypt device (and possible header on-disk) but do not activate it. + * + * @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) + * + * @returns @e 0 on success or negative errno value otherwise. + * + * @note Note that crypt_format does not create LUKS keyslot (any version). To create keyslot + * call any crypt_keyslot_add_* function. + * @note For VERITY @link crypt-type @endlink, only uuid parameter is used, other parameters + * are ignored and verity specific attributes are set through mandatory params option. + */ +int crypt_format(struct crypt_device *cd, + const char *type, + const char *cipher, + const char *cipher_mode, + const char *uuid, + const char *volume_key, + size_t volume_key_size, + void *params); + +/** + * Convert to new type for already existing device. + * + * @param cd crypt device handle + * @param type type of device (optional params struct must be of this type) + * @param params crypt type specific parameters (see @link crypt-type @endlink) + * + * @returns 0 on success or negative errno value otherwise. + * + * @note Currently, only LUKS1->LUKS2 and LUKS2->LUKS1 conversions are supported. + * Not all LUKS2 devices may be converted back to LUKS1. To make such a conversion + * possible all active LUKS2 keyslots must be in LUKS1 compatible mode (i.e. pbkdf + * type must be PBKDF2) and device cannot be formatted with any authenticated + * encryption mode. + * + * @note Device must be offline for conversion. UUID change is not possible for active + * devices. + */ +int crypt_convert(struct crypt_device *cd, + const char *type, + void *params); + +/** + * Set new UUID for already existing device. + * + * @param cd crypt device handle + * @param uuid requested UUID or @e 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); + +/** + * Set new labels (label and subsystem) for already existing device. + * + * @param cd crypt device handle + * @param label requested label or @e NULL + * @param subsystem requested subsystem label or @e NULL + * + * @returns 0 on success or negative errno value otherwise. + * + * @note Currently, only LUKS2 device type is supported + */ +int crypt_set_label(struct crypt_device *cd, + const char *label, + const char *subsystem); + +/** + * Enable or disable loading of volume keys via kernel keyring. When set to + * 'enabled' library loads key in kernel keyring first and pass the key + * description to dm-crypt instead of binary key copy. If set to 'disabled' + * library fallbacks to old method of loading volume key directly in + * dm-crypt target. + * + * @param cd crypt device handle, can be @e NULL + * @param enable 0 to disable loading of volume keys via kernel keyring + * (classical method) otherwise enable it (default) + * + * @returns @e 0 on success or negative errno value otherwise. + * + * @note Currently loading of volume keys via kernel keyring is supported + * (and enabled by default) only for LUKS2 devices. + * @note The switch is global on the library level. + */ +int crypt_volume_key_keyring(struct crypt_device *cd, int enable); + +/** + * Load crypt device parameters from on-disk header. + * + * @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. + * + */ +int crypt_load(struct crypt_device *cd, + const char *requested_type, + void *params); + +/** + * Try to repair crypt device LUKS 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. + * + * @note For LUKS2 device crypt_repair bypass blkid checks and + * perform auto-recovery even though there're third party device + * signatures found by blkid probes. Currently the crypt_repair on LUKS2 + * works only if exactly one header checksum does not match or exactly + * one header is missing. + */ +int crypt_repair(struct crypt_device *cd, + const char *requested_type, + void *params); + +/** + * Resize crypt device. + * + * @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 + * + * @return @e 0 on success or negative errno value otherwise. + * + * @note Most notably it returns -EPERM when device was activated with volume key + * in kernel keyring and current device handle (context) doesn't have verified key + * loaded in kernel. To load volume key for already active device use any of + * @link crypt_activate_by_passphrase @endlink, @link crypt_activate_by_keyfile @endlink, + * @link crypt_activate_by_keyfile_offset @endlink, @link crypt_activate_by_volume_key @endlink, + * @link crypt_activate_by_keyring @endlink or @link crypt_activate_by_token @endlink with flag + * @e CRYPT_ACTIVATE_KEYRING_KEY raised and @e name parameter set to @e NULL. + */ +int crypt_resize(struct crypt_device *cd, + const char *name, + uint64_t new_size); + +/** + * Suspend crypt device. + * + * @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 + * + */ +int crypt_suspend(struct crypt_device *cd, + const char *name); + +/** + * Resume crypt device using passphrase. + * + * + * @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 + * @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); + +/** + * Resume crypt device using key file. + * + * @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 + * @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 + * + * @return unlocked key slot number or negative errno otherwise. + */ +int crypt_resume_by_keyfile_device_offset(struct crypt_device *cd, + const char *name, + int keyslot, + const char *keyfile, + size_t keyfile_size, + uint64_t keyfile_offset); + +/** + * Backward compatible crypt_resume_by_keyfile_device_offset() (with size_t offset). + */ +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_device_offset() (without offset). + */ +int crypt_resume_by_keyfile(struct crypt_device *cd, + const char *name, + int keyslot, + const char *keyfile, + size_t keyfile_size); +/** @} */ + +/** + * @defgroup crypt-keyslot LUKS keyslots + * @addtogroup crypt-keyslot + * @{ + */ + +/** iterate through all keyslots and find first one that fits */ +#define CRYPT_ANY_SLOT -1 + +/** + * Add key slot using provided passphrase. + * + * @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 + * @param passphrase_size size of passphrase (binary data) + * @param new_passphrase passphrase for new keyslot + * @param new_passphrase_size size of @e new_passphrase (binary data) + * + * @return allocated key slot number or negative errno otherwise. + */ +int crypt_keyslot_add_by_passphrase(struct crypt_device *cd, + int keyslot, + const char *passphrase, + size_t passphrase_size, + const char *new_passphrase, + size_t new_passphrase_size); + +/** + * Change defined key slot using provided passphrase. + * + * @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 + * @param passphrase_size size of passphrase (binary data) + * @param new_passphrase passphrase for new keyslot + * @param new_passphrase_size size of @e new_passphrase (binary data) + * + * @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_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. + * + * @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 + * @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 + * @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 + * + * @return allocated key slot number or negative errno otherwise. + */ +int crypt_keyslot_add_by_keyfile_device_offset(struct crypt_device *cd, + int keyslot, + const char *keyfile, + size_t keyfile_size, + uint64_t keyfile_offset, + const char *new_keyfile, + size_t new_keyfile_size, + uint64_t new_keyfile_offset); + +/** + * Backward compatible crypt_keyslot_add_by_keyfile_device_offset() (with size_t offset). + */ +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_device_offset() (without offset). + */ +int crypt_keyslot_add_by_keyfile(struct crypt_device *cd, + int keyslot, + const char *keyfile, + size_t keyfile_size, + const char *new_keyfile, + size_t new_keyfile_size); + +/** + * Add key slot using provided volume key. + * + * @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 + * @param passphrase_size size of passphrase + * + * @return allocated key slot number or negative errno otherwise. + */ +int crypt_keyslot_add_by_volume_key(struct crypt_device *cd, + int keyslot, + const char *volume_key, + size_t volume_key_size, + const char *passphrase, + size_t passphrase_size); + +/** create keyslot with volume key not associated with current dm-crypt segment */ +#define CRYPT_VOLUME_KEY_NO_SEGMENT (1 << 0) + +/** create keyslot with new volume key and assign it to current dm-crypt segment */ +#define CRYPT_VOLUME_KEY_SET (1 << 1) + +/** + * Add key slot using provided key. + * + * @pre @e cd contains initialized and formatted LUKS2 device context + * + * @param cd crypt device handle + * @param keyslot requested keyslot or CRYPT_ANY_SLOT + * @param volume_key provided volume key or @e NULL (see note below) + * @param volume_key_size size of volume_key + * @param passphrase passphrase for new keyslot + * @param passphrase_size size of passphrase + * @param flags key flags to set + * + * @return allocated key slot number or negative errno otherwise. + * + * @note in case volume_key is @e NULL following first matching rule will apply: + * @li if cd is device handle used in crypt_format() by current process, the volume + * key generated (or passed) in crypt_format() will be stored in keyslot. + * @li if CRYPT_VOLUME_KEY_NO_SEGMENT flag is raised the new volume_key will be + * generated and stored in keyslot. The keyslot will become unbound (unusable to + * dm-crypt device activation). + * @li fails with -EINVAL otherwise + * + * @warning CRYPT_VOLUME_KEY_SET flag force updates volume key. It is @b not @b reencryption! + * By doing so you will most probably destroy your ciphertext data device. It's supposed + * to be used only in wrapped keys scheme for key refresh process where real (inner) volume + * key stays untouched. It may be involed on active @e keyslot which makes the (previously + * unbound) keyslot new regular keyslot. + */ +int crypt_keyslot_add_by_key(struct crypt_device *cd, + int keyslot, + const char *volume_key, + size_t volume_key_size, + const char *passphrase, + size_t passphrase_size, + uint32_t flags); + +/** + * Destroy (and disable) key slot. + * + * @pre @e cd contains initialized and formatted LUKS device context + * + * @param cd crypt device handle + * @param keyslot requested key slot to destroy + * + * @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 crypt-aflags Device runtime attributes + * Activation flags + * @addtogroup crypt-aflags + * @{ + */ + +/** device is read only */ +#define CRYPT_ACTIVATE_READONLY (1 << 0) +/** 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) +/** 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) +/** use same_cpu_crypt option for dm-crypt */ +#define CRYPT_ACTIVATE_SAME_CPU_CRYPT (1 << 6) +/** use submit_from_crypt_cpus for dm-crypt */ +#define CRYPT_ACTIVATE_SUBMIT_FROM_CRYPT_CPUS (1 << 7) +/** dm-verity: ignore_corruption flag - ignore corruption, log it only */ +#define CRYPT_ACTIVATE_IGNORE_CORRUPTION (1 << 8) +/** dm-verity: restart_on_corruption flag - restart kernel on corruption */ +#define CRYPT_ACTIVATE_RESTART_ON_CORRUPTION (1 << 9) +/** dm-verity: ignore_zero_blocks - do not verify zero blocks */ +#define CRYPT_ACTIVATE_IGNORE_ZERO_BLOCKS (1 << 10) +/** key loaded in kernel keyring instead directly in dm-crypt */ +#define CRYPT_ACTIVATE_KEYRING_KEY (1 << 11) +/** dm-integrity: direct writes, do not use journal */ +#define CRYPT_ACTIVATE_NO_JOURNAL (1 << 12) +/** dm-integrity: recovery mode - no journal, no integrity checks */ +#define CRYPT_ACTIVATE_RECOVERY (1 << 13) +/** ignore persistently stored flags */ +#define CRYPT_ACTIVATE_IGNORE_PERSISTENT (1 << 14) +/** dm-verity: check_at_most_once - check data blocks only the first time */ +#define CRYPT_ACTIVATE_CHECK_AT_MOST_ONCE (1 << 15) +/** allow activation check including unbound keyslots (keyslots without segments) */ +#define CRYPT_ACTIVATE_ALLOW_UNBOUND_KEY (1 << 16) +/** dm-integrity: activate automatic recalculation */ +#define CRYPT_ACTIVATE_RECALCULATE (1 << 17) +/** reactivate existing and update flags, input only */ +#define CRYPT_ACTIVATE_REFRESH (1 << 18) + +/** + * Active device runtime attributes + */ +struct crypt_active_device { + uint64_t offset; /**< offset in sectors */ + uint64_t iv_offset; /**< IV initialization sector */ + uint64_t size; /**< active device size */ + uint32_t flags; /**< activation flags */ +}; + +/** + * Receive runtime attributes of active crypt device. + * + * @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 + * + */ +int crypt_get_active_device(struct crypt_device *cd, + const char *name, + struct crypt_active_device *cad); + +/** + * Get detected number of integrity failures. + * + * @param cd crypt device handle (can be @e NULL) + * @param name name of active device + * + * @return number of integrity failures or @e 0 otherwise + * + */ +uint64_t crypt_get_active_integrity_failures(struct crypt_device *cd, + const char *name); +/** @} */ + +/** + * @defgroup crypt-pflags LUKS2 Device persistent flags and requirements + * @addtogroup crypt-pflags + * @{ + */ + +/** + * LUKS2 header requirements + */ +/** Unfinished offline reencryption */ +#define CRYPT_REQUIREMENT_OFFLINE_REENCRYPT (1 << 0) +/** unknown requirement in header (output only) */ +#define CRYPT_REQUIREMENT_UNKNOWN (1 << 31) + +/** + * Persistent flags type + */ +typedef enum { + CRYPT_FLAGS_ACTIVATION, /**< activation flags, @see aflags */ + CRYPT_FLAGS_REQUIREMENTS /**< requirements flags */ +} crypt_flags_type; + +/** + * Set persistent flags. + * + * @param cd crypt device handle (can be @e NULL) + * @param type type to set (CRYPT_FLAGS_ACTIVATION or CRYPT_FLAGS_REQUIREMENTS) + * @param flags flags to set + * + * @return @e 0 on success or negative errno value otherwise + * + * @note Valid only for LUKS2. + * + * @note Not all activation flags can be stored. Only ALLOW_DISCARD, + * SAME_CPU_CRYPT, SUBMIT_FROM_CRYPT_CPU and NO_JOURNAL can be + * stored persistently. + * + * @note Only requirements flags recognised by current library may be set. + * CRYPT_REQUIREMENT_UNKNOWN is illegal (output only) in set operation. + */ +int crypt_persistent_flags_set(struct crypt_device *cd, + crypt_flags_type type, + uint32_t flags); + +/** + * Get persistent flags stored in header. + * + * @param cd crypt device handle (can be @e NULL) + * @param type flags type to retrieve (CRYPT_FLAGS_ACTIVATION or CRYPT_FLAGS_REQUIREMENTS) + * @param flags reference to output variable + * + * @return @e 0 on success or negative errno value otherwise + */ +int crypt_persistent_flags_get(struct crypt_device *cd, + crypt_flags_type type, + uint32_t *flags); +/** @} */ + +/** + * @defgroup crypt-activation Device activation + * @addtogroup crypt-activation + * @{ + */ + +/** + * Activate device or check passphrase. + * + * @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 + * @param passphrase_size size of @e passphrase + * @param flags activation flags + * + * @return unlocked key slot number or negative errno otherwise. + */ +int crypt_activate_by_passphrase(struct crypt_device *cd, + const char *name, + int keyslot, + const char *passphrase, + size_t passphrase_size, + uint32_t flags); + +/** + * Activate device or check using key file. + * + * @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 + * + * @return unlocked key slot number or negative errno otherwise. + */ +int crypt_activate_by_keyfile_device_offset(struct crypt_device *cd, + const char *name, + int keyslot, + const char *keyfile, + size_t keyfile_size, + uint64_t keyfile_offset, + uint32_t flags); + +/** + * Backward compatible crypt_activate_by_keyfile_device_offset() (with size_t offset). + */ +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_device_offset() (without offset). + */ +int crypt_activate_by_keyfile(struct crypt_device *cd, + const char *name, + int keyslot, + const char *keyfile, + size_t keyfile_size, + uint32_t flags); + +/** + * Activate device using provided volume key. + * + * @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. + * + * @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, + const char *volume_key, + size_t volume_key_size, + uint32_t flags); + +/** + * Activate device using passphrase stored in kernel keyring. + * + * @param cd crypt device handle + * @param name name of device to create, if @e NULL only check passphrase in keyring + * @param key_description kernel keyring key description library should look + * for passphrase in + * @param keyslot requested keyslot to check or CRYPT_ANY_SLOT + * @param flags activation flags + * + * @return @e unlocked keyslot number on success or negative errno value otherwise. + * + * @note Keyslot passphrase must be stored in 'user' key type + * and the key has to be reachable for process context + * on behalf of which this function is called. + */ +int crypt_activate_by_keyring(struct crypt_device *cd, + const char *name, + const char *key_description, + int keyslot, + uint32_t flags); + +/** lazy deactivation - remove once last user releases it */ +#define CRYPT_DEACTIVATE_DEFERRED (1 << 0) +/** force deactivation - if the device is busy, it is replaced by error device */ +#define CRYPT_DEACTIVATE_FORCE (1 << 1) + +/** + * 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 + * + * @param cd crypt device handle, can be @e NULL + * @param name name of device to deactivate + * @param flags deactivation flags + * + * @return @e 0 on success or negative errno value otherwise. + * + */ +int crypt_deactivate_by_name(struct crypt_device *cd, + const char *name, + uint32_t flags); + +/** + * Deactivate crypt device. See @ref crypt_deactivate_by_name with empty @e flags. + */ +int crypt_deactivate(struct crypt_device *cd, const char *name); +/** @} */ + +/** + * @defgroup crypt-key Volume Key manipulation + * @addtogroup crypt-key + * @{ + */ + +/** + * Get volume key from crypt device. + * + * @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. + * + * @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, + char *volume_key, + size_t *volume_key_size, + const char *passphrase, + size_t passphrase_size); + +/** + * Verify that provided volume key is valid for crypt device. + * + * @param cd crypt device handle + * @param volume_key provided volume key + * @param volume_key_size size of @e 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 crypt-devstat Crypt and Verity device status + * @addtogroup crypt-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. + * + * @param cd crypt device handle, can be @e NULL + * @param name crypt device name + * + * @return value defined by crypt_status_info. + * + */ +crypt_status_info crypt_status(struct crypt_device *cd, const char *name); + +/** + * Dump text-formatted information about crypt or verity device to log output. + * + * @param cd crypt device handle + * + * @return @e 0 on success or negative errno value otherwise. + */ +int crypt_dump(struct crypt_device *cd); + +/** + * Get cipher used in device. + * + * @param cd crypt device handle + * + * @return used cipher, e.g. "aes" or @e NULL otherwise + * + */ +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 path to detached metadata device or @e NULL if it is not detached. + * + * @param cd crypt device handle + * + * @return path to underlaying device name + * + */ +const char *crypt_get_metadata_device_name(struct crypt_device *cd); + +/** + * Get device offset in 512-bytes 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 512-bytes 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 size (in bytes) of encryption sector for crypt device. + * + * @param cd crypt device handle + * + * @return sector size + * + */ +int crypt_get_sector_size(struct crypt_device *cd); + +/** + * Get device parameters for VERITY device. + * + * @param cd crypt device handle + * @param vp verity device info + * + * @e 0 on success or negative errno value otherwise. + * + */ +int crypt_get_verity_info(struct crypt_device *cd, + struct crypt_params_verity *vp); + +/** + * Get device parameters for INTEGRITY device. + * + * @param cd crypt device handle + * @param ip verity device info + * + * @e 0 on success or negative errno value otherwise. + * + */ +int crypt_get_integrity_info(struct crypt_device *cd, + struct crypt_params_integrity *ip); +/** @} */ + +/** + * @defgroup crypt-benchmark Benchmarking + * Benchmarking of algorithms + * @addtogroup crypt-benchmark + * @{ + */ + +/** + * 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. + * + * @note If encryption_buffer_size is too small and encryption time + * cannot be properly measured, -ERANGE is returned. + */ +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); + +/** + * Informational benchmark for PBKDF. + * + * @param cd crypt device handle + * @param pbkdf PBKDF parameters + * @param password password for benchmark + * @param password_size size of password + * @param salt salt for benchmark + * @param salt_size size of salt + * @param volume_key_size output volume key size + * @param progress callback function + * @param usrptr provided identification in callback + * + * @return @e 0 on success or negative errno value otherwise. + */ +int crypt_benchmark_pbkdf(struct crypt_device *cd, + struct crypt_pbkdf_type *pbkdf, + const char *password, + size_t password_size, + const char *salt, + size_t salt_size, + size_t volume_key_size, + int (*progress)(uint32_t time_ms, void *usrptr), + void *usrptr); +/** @} */ + +/** + * @addtogroup crypt-keyslot + * @{ + */ + +/** + * Crypt keyslot info + */ +typedef enum { + 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_SLOT_UNBOUND /**< keyslot is active and not bound + * to any crypt segment (LUKS2 only) */ +} 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); + +/** + * Crypt keyslot priority + */ +typedef enum { + CRYPT_SLOT_PRIORITY_INVALID =-1, /**< no such slot */ + CRYPT_SLOT_PRIORITY_IGNORE = 0, /**< CRYPT_ANY_SLOT will ignore it for open */ + CRYPT_SLOT_PRIORITY_NORMAL = 1, /**< default priority, tried after preferred */ + CRYPT_SLOT_PRIORITY_PREFER = 2, /**< will try to open first */ +} crypt_keyslot_priority; + +/** + * Get keyslot priority (LUKS2) + * + * @param cd crypt device handle + * @param keyslot keyslot number + * + * @return value defined by crypt_keyslot_priority + */ +crypt_keyslot_priority crypt_keyslot_get_priority(struct crypt_device *cd, int keyslot); + +/** + * Set keyslot priority (LUKS2) + * + * @param cd crypt device handle + * @param keyslot keyslot number + * @param priority priority defined in crypt_keyslot_priority + * + * @return @e 0 on success or negative errno value otherwise. + */ +int crypt_keyslot_set_priority(struct crypt_device *cd, int keyslot, crypt_keyslot_priority priority); + +/** + * 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); + +/** + * Get size (in bytes) of stored key in particular keyslot. + * Use for LUKS2 unbound keyslots, for other keyslots it is the same as @ref crypt_get_volume_key_size + * + * @param cd crypt device handle + * @param keyslot keyslot number + * + * @return volume key size or negative errno value otherwise. + * + */ +int crypt_keyslot_get_key_size(struct crypt_device *cd, int keyslot); + +/** + * Get cipher and key size for keyslot encryption. + * Use for LUKS2 keyslot to set different encryption type than for data encryption. + * Parameters will be used for next keyslot operations. + * + * @param cd crypt device handle + * @param keyslot keyslot number of CRYPT_ANY_SLOT for default + * @param key_size encryption key size (in bytes) + * + * @return cipher specification on success or @e NULL. + * + * @note This is the encryption of keyslot itself, not the data encryption algorithm! + */ +const char *crypt_keyslot_get_encryption(struct crypt_device *cd, int keyslot, size_t *key_size); + +/** + * Get PBKDF parameters for keyslot. + * + * @param cd crypt device handle + * @param keyslot keyslot number + * @param pbkdf struct with returned PBKDF parameters + * + * @return @e 0 on success or negative errno value otherwise. + */ +int crypt_keyslot_get_pbkdf(struct crypt_device *cd, int keyslot, struct crypt_pbkdf_type *pbkdf); + +/** + * Set encryption for keyslot. + * Use for LUKS2 keyslot to set different encryption type than for data encryption. + * Parameters will be used for next keyslot operations that create or change a keyslot. + * + * @param cd crypt device handle + * @param cipher (e.g. "aes-xts-plain64") + * @param key_size encryption key size (in bytes) + * + * @return @e 0 on success or negative errno value otherwise. + * + * @note To reset to default keyslot encryption (the same as for data) + * set cipher to NULL and key size to 0. + */ +int crypt_keyslot_set_encryption(struct crypt_device *cd, + const char *cipher, + size_t key_size); + +/** + * Get directory where mapped crypt devices are created + * + * @return the directory path + */ +const char *crypt_get_dir(void); + +/** @} */ + +/** + * @defgroup crypt-backup Device metadata backup + * @addtogroup crypt-backup + * @{ + */ +/** + * Backup header and keyslots to file. + * + * @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. + * + */ +int crypt_header_backup(struct crypt_device *cd, + const char *requested_type, + const char *backup_file); + +/** + * Restore header and keyslots from backup file. + * + * @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, + const char *backup_file); +/** @} */ + +/** + * @defgroup crypt-dbg Library debug level + * Set library debug level + * @addtogroup crypt-dbg + * @{ + */ + +/** Debug all */ +#define CRYPT_DEBUG_ALL -1 +/** Debug all with adidtional JSON dump (for LUKS2) */ +#define CRYPT_DEBUG_JSON -2 +/** Debug none */ +#define CRYPT_DEBUG_NONE 0 + +/** + * Set the debug level for library + * + * @param level debug level + * + */ +void crypt_set_debug_level(int level); +/** @} */ + +/** + * @defgroup crypt-keyfile Function to read keyfile + * @addtogroup crypt-keyfile + * @{ + */ + +/** + * Read keyfile + * + * @param cd crypt device handle + * @param keyfile keyfile to read + * @param key buffer for key + * @param key_size_read size of read key + * @param keyfile_offset key offset in keyfile + * @param key_size exact key length to read from file or 0 + * @param flags keyfile read flags + * + * @return @e 0 on success or negative errno value otherwise. + * + * @note If key_size is set to zero we read internal max length + * and actual size read is returned via key_size_read parameter. + */ +int crypt_keyfile_device_read(struct crypt_device *cd, + const char *keyfile, + char **key, size_t *key_size_read, + uint64_t keyfile_offset, + size_t key_size, + uint32_t flags); + +/** + * Backward compatible crypt_keyfile_device_read() (with size_t offset). + */ +int crypt_keyfile_read(struct crypt_device *cd, + const char *keyfile, + char **key, size_t *key_size_read, + size_t keyfile_offset, + size_t key_size, + uint32_t flags); + +/** Read key only to the first end of line (\\n). */ +#define CRYPT_KEYFILE_STOP_EOL (1 << 0) +/** @} */ + +/** + * @defgroup crypt-wipe Function to wipe device + * @addtogroup crypt-wipe + * @{ + */ +/** + * Wipe pattern + */ +typedef enum { + CRYPT_WIPE_ZERO, /**< Fill with zeroes */ + CRYPT_WIPE_RANDOM, /**< Use RNG to fill data */ + CRYPT_WIPE_ENCRYPTED_ZERO, /**< Add encryption and fill with zeroes as plaintext */ + CRYPT_WIPE_SPECIAL, /**< Compatibility only, do not use (Gutmann method) */ +} crypt_wipe_pattern; + +/** + * Wipe/Fill (part of) a device with the selected pattern. + * + * @param cd crypt device handle + * @param dev_path path to device to wipe or @e NULL if data device should be used + * @param pattern selected wipe pattern + * @param offset offset on device (in bytes) + * @param length length of area to be wiped (in bytes) + * @param wipe_block_size used block for wiping (one step) (in bytes) + * @param flags wipe flags + * @param progress callback function called after each @e wipe_block_size or @e NULL + * @param usrptr provided identification in callback + * + * @return @e 0 on success or negative errno value otherwise. + * + * @note A @e progress callback can interrupt wipe process by returning non-zero code. + * + * @note If the error values is -EIO or -EINTR, some part of the device could + * be overwritten. Other error codes (-EINVAL, -ENOMEM) means that no IO was performed. + */ +int crypt_wipe(struct crypt_device *cd, + const char *dev_path, /* if null, use data device */ + crypt_wipe_pattern pattern, + uint64_t offset, + uint64_t length, + size_t wipe_block_size, + uint32_t flags, + int (*progress)(uint64_t size, uint64_t offset, void *usrptr), + void *usrptr +); + +/** Use direct-io */ +#define CRYPT_WIPE_NO_DIRECT_IO (1 << 0) +/** @} */ + +/** + * @defgroup crypt-tokens LUKS2 token wrapper access + * + * Utilities for handling tokens LUKS2 + * Token is a device or a method how to read password for particular keyslot + * automatically. It can be chunk of data stored on hardware token or + * just a metadata how to generate the password. + * + * @addtogroup crypt-tokens + * @{ + */ + +/** Iterate through all tokens */ +#define CRYPT_ANY_TOKEN -1 + +/** + * Get content of a token definition in JSON format. + * + * @param cd crypt device handle + * @param token token id + * @param json buffer with JSON + * + * @return allocated token id or negative errno otherwise. + */ +int crypt_token_json_get(struct crypt_device *cd, + int token, + const char **json); + +/** + * Store content of a token definition in JSON format. + * + * @param cd crypt device handle + * @param token token id or @e CRYPT_ANY_TOKEN to allocate new one + * @param json buffer with JSON or @e NULL to remove token + * + * @return allocated token id or negative errno otherwise. + * + * @note The buffer must be in proper JSON format and must contain at least + * string "type" with slot type and an array of string names "keyslots". + * Keyslots array contains assignments to particular slots and can be empty. + */ +int crypt_token_json_set(struct crypt_device *cd, + int token, + const char *json); + +/** + * Token info + */ +typedef enum { + CRYPT_TOKEN_INVALID, /**< token is invalid */ + CRYPT_TOKEN_INACTIVE, /**< token is empty (free) */ + CRYPT_TOKEN_INTERNAL, /**< active internal token with driver */ + CRYPT_TOKEN_INTERNAL_UNKNOWN, /**< active internal token (reserved name) with missing token driver */ + CRYPT_TOKEN_EXTERNAL, /**< active external (user defined) token with driver */ + CRYPT_TOKEN_EXTERNAL_UNKNOWN, /**< active external (user defined) token with missing token driver */ +} crypt_token_info; + +/** + * Get info for specific token. + * + * @param cd crypt device handle + * @param token existing token id + * @param type pointer for returned type string + * + * @return token status info. For any returned status (besides CRYPT_TOKEN_INVALID + * and CRYPT_TOKEN_INACTIVE) and if type parameter is not NULL it will + * contain address of type string. + * + * @note if required, create a copy of string referenced in *type before calling next + * libcryptsetup API function. The reference may become invalid. + */ +crypt_token_info crypt_token_status(struct crypt_device *cd, int token, const char **type); + +/** + * LUKS2 keyring token parameters. + * + * @see crypt_token_builtin_set + * + */ +struct crypt_token_params_luks2_keyring { + const char *key_description; /**< Reference in keyring */ +}; + +/** + * Create a new luks2 keyring token. + * + * @param cd crypt device handle + * @param token token id or @e CRYPT_ANY_TOKEN to allocate new one + * @param params luks2 keyring token params + * + * @return allocated token id or negative errno otherwise. + * + */ +int crypt_token_luks2_keyring_set(struct crypt_device *cd, + int token, + const struct crypt_token_params_luks2_keyring *params); + +/** + * Get LUKS2 keyring token params + * + * @param cd crypt device handle + * @param token existing luks2 keyring token id + * @param params returned luks2 keyring token params + * + * @return allocated token id or negative errno otherwise. + * + * @note do not call free() on params members. Members are valid only + * until next libcryptsetup function is called. + */ +int crypt_token_luks2_keyring_get(struct crypt_device *cd, + int token, + struct crypt_token_params_luks2_keyring *params); + +/** + * Assign a token to particular keyslot. + * (There can be more keyslots assigned to one token id.) + * + * @param cd crypt device handle + * @param token token id + * @param keyslot keyslot to be assigned to token (CRYPT_ANY SLOT + * assigns all active keyslots to token) + * + * @return allocated token id or negative errno otherwise. + */ +int crypt_token_assign_keyslot(struct crypt_device *cd, + int token, + int keyslot); + +/** + * Unassign a token from particular keyslot. + * (There can be more keyslots assigned to one token id.) + * + * @param cd crypt device handle + * @param token token id + * @param keyslot keyslot to be unassigned from token (CRYPT_ANY SLOT + * unassigns all active keyslots from token) + * + * @return allocated token id or negative errno otherwise. + */ +int crypt_token_unassign_keyslot(struct crypt_device *cd, + int token, + int keyslot); + +/** + * Get info about token assignment to particular keyslot. + * + * @param cd crypt device handle + * @param token token id + * @param keyslot keyslot + * + * @return 0 on success (token exists and is assigned to the keyslot), + * -ENOENT if token is not assigned to a keyslot (token, keyslot + * or both may be inactive) or other negative errno otherwise. + */ +int crypt_token_is_assigned(struct crypt_device *cd, + int token, + int keyslot); + +/** + * Token handler open function prototype. + * This function retrieves password from a token and return allocated buffer + * containing this password. This buffer has to be deallocated by calling + * free() function and content should be wiped before deallocation. + * + * @param cd crypt device handle + * @param token token id + * @param buffer returned allocated buffer with password + * @param buffer_len length of the buffer + * @param usrptr user data in @link crypt_activate_by_token @endlink + */ +typedef int (*crypt_token_open_func) ( + struct crypt_device *cd, + int token, + char **buffer, + size_t *buffer_len, + void *usrptr); + +/** + * Token handler buffer free function prototype. + * This function is used by library to free the buffer with keyslot + * passphrase when it's no longer needed. If not defined the library + * overwrites buffer with zeroes and call free(). + * + * @param buffer the buffer with keyslot passphrase + * @param buffer_len the buffer length + */ +typedef void (*crypt_token_buffer_free_func) (void *buffer, size_t buffer_len); + +/** + * Token handler validate function prototype. + * This function validates JSON representation of user defined token for additional data + * specific for its token type. If defined in the handler, it's called + * during @link crypt_activate_by_token @endlink. It may also be called during + * @link crypt_token_json_set @endlink when appropriate token handler was registered before + * with @link crypt_token_register @endlink. + * + * @param cd crypt device handle + * @param json buffer with JSON + */ +typedef int (*crypt_token_validate_func) (struct crypt_device *cd, const char *json); + +/** + * Token handler dump function prototype. + * This function is supposed to print token implementation specific details. It gets + * called during @link crypt_dump @endlink if token handler was registered before. + * + * @param cd crypt device handle + * @param json buffer with token JSON + * + * @note dump implementations are advised to use @link crypt_log @endlink function + * to dump token details. + */ +typedef void (*crypt_token_dump_func) (struct crypt_device *cd, const char *json); + +/** + * Token handler + */ +typedef struct { + const char *name; /**< token handler name */ + crypt_token_open_func open; /**< token handler open function */ + crypt_token_buffer_free_func buffer_free; /**< token handler buffer_free function (optional) */ + crypt_token_validate_func validate; /**< token handler validate function (optional) */ + crypt_token_dump_func dump; /**< token handler dump function (optional) */ +} crypt_token_handler; + +/** + * Register token handler + * + * @param handler token handler to register + * + * @return @e 0 on success or negative errno value otherwise. + */ +int crypt_token_register(const crypt_token_handler *handler); + +/** + * Activate device or check key using a token. + * + * @param cd crypt device handle + * @param name name of device to create, if @e NULL only check token + * @param token requested token to check or CRYPT_ANY_TOKEN to check all + * @param usrptr provided identification in callback + * @param flags activation flags + * + * @return unlocked key slot number or negative errno otherwise. + */ +int crypt_activate_by_token(struct crypt_device *cd, + const char *name, + int token, + void *usrptr, + uint32_t flags); +/** @} */ + +#ifdef __cplusplus +} +#endif +#endif /* _LIBCRYPTSETUP_H */ |