mirror of
https://gitlab.com/cryptsetup/cryptsetup.git
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2072adf705
git-svn-id: https://cryptsetup.googlecode.com/svn/trunk@481 36d66b0a-2a48-0410-832c-cd162a569da5
679 lines
20 KiB
C
679 lines
20 KiB
C
#ifndef _LIBCRYPTSETUP_H
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#define _LIBCRYPTSETUP_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <stdint.h>
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struct crypt_device; /* crypt device handle */
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/**
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* Initialise crypt device handle and check if provided device exists.
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*
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* Returns 0 on success or negative errno value otherwise.
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*
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* @cd - returns pointer to crypt device handle
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* @device - path to device
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*
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* Note that logging is not initialized here, possible messages uses
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* default log function.
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*/
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int crypt_init(struct crypt_device **cd, const char *device);
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/**
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* Initialise crypt device handle from provided active device name
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* and check if provided device exists.
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*
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* Returns 0 on success or negative errno value otherwise.
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*
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* @cd - crypt device handle
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* @name - name of active crypt device
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*/
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int crypt_init_by_name(struct crypt_device **cd, const char *name);
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/**
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* Set log function.
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*
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* @cd - crypt device handle (can be NULL to set default log function)
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* @usrptr - provided identification in callback
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* @level - log level below (debug messages can uses other levels)
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* @msg - log message
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*/
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#define CRYPT_LOG_NORMAL 0
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#define CRYPT_LOG_ERROR 1
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#define CRYPT_LOG_VERBOSE 2
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#define CRYPT_LOG_DEBUG -1 /* always on stdout */
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void crypt_set_log_callback(struct crypt_device *cd,
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void (*log)(int level, const char *msg, void *usrptr),
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void *usrptr);
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/**
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* Log message through log function.
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*
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* @cd - crypt device handle
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* @level - log level
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* @msg - log message
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*/
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void crypt_log(struct crypt_device *cd, int level, const char *msg);
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/**
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* Set confirmation callback (yes/no)
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*
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* If code need confirmation (like deleting last key slot) this function
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* is called. If not defined, everything is confirmed.
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*
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* Calback should return 0 if operation is declined, other values mean accepted.
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*
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* @cd - crypt device handle
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* @usrptr - provided identification in callback
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* @msg - Message for user to confirm
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*/
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void crypt_set_confirm_callback(struct crypt_device *cd,
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int (*confirm)(const char *msg, void *usrptr),
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void *usrptr);
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/**
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* Set password query callback.
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*
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* If code need _interactive_ query for password, this callback is called.
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* If not defined, compiled-in default is called (uses terminal input).
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*
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* @cd - crypt device handle
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* @usrptr - provided identification in callback
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* @msg - Message for user
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* @buf - buffer for password
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* @length - size of buffer
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*
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* Calback should return length of password in buffer
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* or negative errno value in case of error.
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*
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* - Note that if this function is defined, verify option is ignored
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* (caller which provided callback is responsible for password verification)
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* - Only zero terminated passwords can be entered this way, for complex
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* use API functions directly.
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* - Maximal length of password is limited to @length-1 (minimal 511 chars)
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*/
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void crypt_set_password_callback(struct crypt_device *cd,
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int (*password)(const char *msg, char *buf, size_t length, void *usrptr),
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void *usrptr);
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/**
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* Various crypt device parameters
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*
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* @cd - crypt device handle
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* @timeout - timeout in seconds for password entry if compiled-in function used
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* @password_retry - number of tries for password if not verified
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* @iteration_time - iteration time for LUKS header in miliseconds
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* @password_verify - for compiled-in password query always verify passwords twice
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*/
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void crypt_set_timeout(struct crypt_device *cd, uint64_t timeout_sec);
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void crypt_set_password_retry(struct crypt_device *cd, int tries);
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void crypt_set_iterarion_time(struct crypt_device *cd, uint64_t iteration_time_ms);
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void crypt_set_password_verify(struct crypt_device *cd, int password_verify);
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/**
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* Set which RNG (random number generator) is used for generating long term key
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* @cd - crypt device handle
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* @rng_type - kernel random number generator to use
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*
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* CRYPT_RNG_URANDOM - use /dev/urandom
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* CRYPT_RNG_RANDOM - use /dev/random (waits if no entropy in system)
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*/
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#define CRYPT_RNG_URANDOM 0
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#define CRYPT_RNG_RANDOM 1
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void crypt_set_rng_type(struct crypt_device *cd, int rng_type);
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/**
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* Get which RNG (random number generator) is used for generating long term key
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*
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* Returns RNG type on success or negative errno value otherwise.
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*
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* @cd - crypt device handle
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*/
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int crypt_get_rng_type(struct crypt_device *cd);
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/**
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* Helper to lock/unlock memory to avoid swap sensitive data to disk
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*
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* @cd - crypt device handle, can be NULL
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* @lock - 0 to unloct otherwise lock memory
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*
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* Return value indicates that memory is locked (function can be called multiple times).
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* Only root can do this. Note it locks/unlocks all process memory, not only crypt context.
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*/
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int crypt_memory_lock(struct crypt_device *cd, int lock);
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#define CRYPT_PLAIN "PLAIN" /* regular crypt device, no on-disk header */
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#define CRYPT_LUKS1 "LUKS1" /* LUKS version 1 header on-disk */
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#define CRYPT_LOOPAES "LOOPAES" /* loop-AES compatibility mode */
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/**
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* Get device type
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*
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* @cd - crypt device handle
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*
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* Returns string according to device type or NULL if not known.
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*/
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const char *crypt_get_type(struct crypt_device *cd);
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struct crypt_params_plain {
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const char *hash; /* password hash function */
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uint64_t offset; /* offset in sectors */
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uint64_t skip; /* IV initilisation sector */
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};
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struct crypt_params_luks1 {
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const char *hash; /* hash used in LUKS header */
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size_t data_alignment; /* in sectors, data offset is multiple of this */
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};
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struct crypt_params_loopaes {
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const char *hash; /* key hash function */
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uint64_t offset; /* offset in sectors */
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uint64_t skip; /* IV initilisation sector */
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};
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/**
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* Create (format) new crypt device (and possible header on-disk) but not activates it.
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*
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* Returns 0 on success or negative errno value otherwise.
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*
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* @cd - crypt device handle
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* @type - type of device (optional params struct must be of this type)
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* @cipher - (e.g. "aes")
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* @cipher_mode - including IV specification (e.g. "xts-plain")
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* @uuid - requested UUID or NULL if it should be generated
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* @volume_key - pre-generated volume key or NULL if it should be generated (only for LUKS)
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* @volume_key_size - size of volume key in bytes.
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* @params - crypt type specific parameters
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*
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* Note that crypt_format does not enable any keyslot, but it stores volume key internally
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* and subsequent crypt_keyslot_add_* calls can be used.
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*/
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int crypt_format(struct crypt_device *cd,
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const char *type,
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const char *cipher,
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const char *cipher_mode,
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const char *uuid,
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const char *volume_key,
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size_t volume_key_size,
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void *params);
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/**
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* Set new UUID for already existing device (if format supports it)
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*
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* Returns 0 on success or negative errno value otherwise.
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*
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* @cd - crypt device handle
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* @uuid - requested UUID or NULL if it should be generated
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*/
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int crypt_set_uuid(struct crypt_device *cd,
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const char *uuid);
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/**
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* Load crypt device parameters from on-disk header
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*
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* Returns 0 on success or negative errno value otherwise.
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*
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* @cd - crypt device handle
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* @requested_type - use NULL for all known
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* @params - crypt type specific parameters
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*/
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int crypt_load(struct crypt_device *cd,
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const char *requested_type,
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void *params);
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/**
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* Resize crypt device
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*
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* Returns 0 on success or negative errno value otherwise.
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*
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* @cd - crypt device handle
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* @name - name of device to resize
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* @new_size - new device size in sectors or 0 to use underlying device size
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*/
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int crypt_resize(struct crypt_device *cd,
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const char *name,
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uint64_t new_size);
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/**
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* Suspends crypt device.
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*
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* Returns 0 on success or negative errno value otherwise.
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*
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* @cd - crypt device handle, can be NULL
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* @name - name of device to suspend
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*/
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int crypt_suspend(struct crypt_device *cd,
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const char *name);
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/**
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* Resumes crypt device using passphrase.
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*
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* Returns unlocked key slot number or negative errno otherwise.
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*
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* @cd - crypt device handle
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* @name - name of device to resume
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* @keyslot - requested keyslot or CRYPT_ANY_SLOT
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* @passphrase - passphrase used to unlock volume key, NULL for query
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* @passphrase_size - size of @passphrase (binary data)
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*/
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int crypt_resume_by_passphrase(struct crypt_device *cd,
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const char *name,
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int keyslot,
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const char *passphrase,
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size_t passphrase_size);
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/**
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* Resumes crypt device using key file.
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*
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* Returns unlocked key slot number or negative errno otherwise.
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*
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* @cd - crypt device handle
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* @name - name of device to resume
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* @keyslot - requested keyslot or CRYPT_ANY_SLOT
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* @keyfile - key file used to unlock volume key, NULL for passphrase query
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* @keyfile_size - number of bytes to read from @keyfile, 0 is unlimited
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*/
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int crypt_resume_by_keyfile(struct crypt_device *cd,
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const char *name,
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int keyslot,
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const char *keyfile,
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size_t keyfile_size);
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/**
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* Releases crypt device context and used memory.
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*
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* @cd - crypt device handle
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*/
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void crypt_free(struct crypt_device *cd);
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/**
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* Add key slot using provided passphrase
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*
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* Returns allocated key slot number or negative errno otherwise.
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*
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* @cd - crypt device handle
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* @keyslot - requested keyslot or CRYPT_ANY_SLOT
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* @passphrase - passphrase used to unlock volume key, NULL for query
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* @passphrase_size - size of @passphrase (binary data)
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* @new_passphrase - passphrase for new keyslot, NULL for query
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* @new_passphrase_size - size of @new_passphrase (binary data)
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*/
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#define CRYPT_ANY_SLOT -1
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int crypt_keyslot_add_by_passphrase(struct crypt_device *cd,
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int keyslot,
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const char *passphrase,
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size_t passphrase_size,
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const char *new_passphrase,
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size_t new_passphrase_size);
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/**
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* Get number of keyslots supported for device type.
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*
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* Returns slot count or negative errno otherwise if device
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* doesn't not support keyslots.
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*
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* @type - crypt device type
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*/
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int crypt_keyslot_max(const char *type);
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/**
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* Add key slot using provided key file path
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*
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* Returns allocated key slot number or negative errno otherwise.
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*
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* @cd - crypt device handle
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* @keyslot - requested keyslot or CRYPT_ANY_SLOT
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* @keyfile - key file used to unlock volume key, NULL for passphrase query
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* @keyfile_size - number of bytes to read from @keyfile, 0 is unlimited
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* @new_keyfile - keyfile for new keyslot, NULL for passphrase query
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* @new_keyfile_size - number of bytes to read from @new_keyfile, 0 is unlimited
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*
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* Note that @keyfile can be "-" for STDIN
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*/
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int crypt_keyslot_add_by_keyfile(struct crypt_device *cd,
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int keyslot,
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const char *keyfile,
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size_t keyfile_size,
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const char *new_keyfile,
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size_t new_keyfile_size);
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/**
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* Add key slot using provided volume key
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*
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* Returns allocated key slot number or negative errno otherwise.
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*
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* @cd - crypt device handle
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* @keyslot - requested keyslot or CRYPT_ANY_SLOT
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* @volume_key - provided volume key or NULL if used after crypt_format
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* @volume_key_size - size of @volume_key
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* @passphrase - passphrase for new keyslot, NULL for query
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* @passphrase_size - size of @passphrase
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*/
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int crypt_keyslot_add_by_volume_key(struct crypt_device *cd,
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int keyslot,
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const char *volume_key,
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size_t volume_key_size,
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const char *passphrase,
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size_t passphrase_size);
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/**
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* Destroy (and disable) key slot
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*
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* Returns 0 on success or negative errno value otherwise.
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*
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* @cd - crypt device handle
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* @keyslot - requested key slot to destroy
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*
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* Note that there is no passphrase verification used.
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*/
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int crypt_keyslot_destroy(struct crypt_device *cd, int keyslot);
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/**
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* Activation flags
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*/
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#define CRYPT_ACTIVATE_READONLY (1 << 0)
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#define CRYPT_ACTIVATE_NO_UUID (1 << 1)
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/**
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* Active device runtime attributes
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*/
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struct crypt_active_device {
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uint64_t offset; /* offset in sectors */
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uint64_t iv_offset; /* IV initilisation sector */
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uint64_t size; /* active device size */
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uint32_t flags; /* activation flags */
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};
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/**
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* Receives runtime attributes of active crypt device
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*
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* Returns 0 on success or negative errno value otherwise.
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*
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* @cd - crypt device handle (can be NULL)
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* @name - name of active device
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* @cad - preallocated active device attributes to fill
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*/
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int crypt_get_active_device(struct crypt_device *cd,
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const char *name,
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struct crypt_active_device *cad);
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/**
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* Activate device or check passphrase
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*
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* Returns unlocked key slot number or negative errno otherwise.
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*
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* @cd - crypt device handle
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* @name - name of device to create, if NULL only check passphrase
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* @keyslot - requested keyslot to check or CRYPT_ANY_SLOT
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* @passphrase - passphrase used to unlock volume key, NULL for query
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* @passphrase_size - size of @passphrase
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* @flags - activation flags
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*/
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int crypt_activate_by_passphrase(struct crypt_device *cd,
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const char *name,
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int keyslot,
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const char *passphrase,
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size_t passphrase_size,
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uint32_t flags);
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/**
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* Activate device or check using key file
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*
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* Returns unlocked key slot number or negative errno otherwise.
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*
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* @cd - crypt device handle
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* @name - name of device to create, if NULL only check keyfile
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* @keyslot - requested keyslot to check or CRYPT_ANY_SLOT
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* @keyfile - key file used to unlock volume key
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* @keyfile_size - number of bytes to read from @keyfile, 0 is unlimited
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* @flags - activation flags
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*/
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int crypt_activate_by_keyfile(struct crypt_device *cd,
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const char *name,
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int keyslot,
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const char *keyfile,
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size_t keyfile_size,
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uint32_t flags);
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/**
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* Activate device using provided volume key
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*
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* Returns 0 on success or negative errno value otherwise.
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*
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* @cd - crypt device handle
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* @name - name of device to create, if NULL only check volume key
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* @volume_key - provided volume key (or NULL to use internal)
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* @volume_key_size - size of @volume_key
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* @flags - activation flags
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*
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* If NULL is used for volume_key, device has to be initialized
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* by previous operation (like crypt_format() or crypt_init_by_name())
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*/
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int crypt_activate_by_volume_key(struct crypt_device *cd,
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const char *name,
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const char *volume_key,
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size_t volume_key_size,
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uint32_t flags);
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/**
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* Deactivate crypt device
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*
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* @cd - crypt device handle, can be NULL
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* @name - name of device to deactivate
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*/
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int crypt_deactivate(struct crypt_device *cd, const char *name);
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/**
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* Get volume key from of crypt device
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*
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* Returns unlocked key slot number or negative errno otherwise.
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*
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* @cd - crypt device handle
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* @keyslot - use this keyslot or CRYPT_ANY_SLOT
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* @volume_key - buffer for volume key
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* @volume_key_size - on input, size of buffer @volume_key,
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* on output size of @volume_key
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* @passphrase - passphrase used to unlock volume key, NULL for query
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* @passphrase_size - size of @passphrase
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*/
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int crypt_volume_key_get(struct crypt_device *cd,
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int keyslot,
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char *volume_key,
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size_t *volume_key_size,
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const char *passphrase,
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size_t passphrase_size);
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/**
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* Verify that provided volume key is valid for crypt device
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*
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* Returns 0 on success or negative errno value otherwise.
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*
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* @cd - crypt device handle
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* @volume_key - provided volume key
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* @volume_key_size - size of @volume_key
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*/
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int crypt_volume_key_verify(struct crypt_device *cd,
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const char *volume_key,
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size_t volume_key_size);
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/**
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* Get status info about device name
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*
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* Returns value defined by crypt_status_info.
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*
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* @cd - crypt device handle, can be NULL
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* @name -crypt device name
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*
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* CRYPT_INACTIVE - no such mapped device
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* CRYPT_ACTIVE - device is active
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* CRYPT_BUSY - device is active and has open count > 0
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*/
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typedef enum {
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CRYPT_INVALID,
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CRYPT_INACTIVE,
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CRYPT_ACTIVE,
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CRYPT_BUSY
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} crypt_status_info;
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crypt_status_info crypt_status(struct crypt_device *cd, const char *name);
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/**
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* Dump text-formatted information about crypt device to log output
|
|
*
|
|
* Returns 0 on success or negative errno value otherwise.
|
|
*
|
|
* @cd - crypt device handle
|
|
*/
|
|
int crypt_dump(struct crypt_device *cd);
|
|
|
|
/**
|
|
* Various crypt device info functions
|
|
*
|
|
* @cd - crypt device handle
|
|
*
|
|
* 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)
|
|
* volume_key_size - size (in bytes) of volume key for crypt device
|
|
*/
|
|
const char *crypt_get_cipher(struct crypt_device *cd);
|
|
const char *crypt_get_cipher_mode(struct crypt_device *cd);
|
|
const char *crypt_get_uuid(struct crypt_device *cd);
|
|
const char *crypt_get_device_name(struct crypt_device *cd);
|
|
uint64_t crypt_get_data_offset(struct crypt_device *cd);
|
|
int crypt_get_volume_key_size(struct crypt_device *cd);
|
|
|
|
/**
|
|
* Get information about particular key slot
|
|
*
|
|
* Returns value defined by crypt_keyslot_info.
|
|
*
|
|
* @cd - crypt device handle
|
|
* @keyslot - requested keyslot to check or CRYPT_ANY_SLOT
|
|
*/
|
|
typedef enum {
|
|
CRYPT_SLOT_INVALID,
|
|
CRYPT_SLOT_INACTIVE,
|
|
CRYPT_SLOT_ACTIVE,
|
|
CRYPT_SLOT_ACTIVE_LAST
|
|
} crypt_keyslot_info;
|
|
crypt_keyslot_info crypt_keyslot_status(struct crypt_device *cd, int keyslot);
|
|
|
|
/**
|
|
* Backup header and keyslots to file
|
|
*
|
|
* Returns 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,
|
|
const char *backup_file);
|
|
|
|
/**
|
|
* 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
|
|
*/
|
|
int crypt_header_restore(struct crypt_device *cd,
|
|
const char *requested_type,
|
|
const char *backup_file);
|
|
|
|
/**
|
|
* Receives last reported error
|
|
*
|
|
* @buf - buffef for message
|
|
* @size - size of buffer
|
|
*
|
|
* 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
|
|
*/
|
|
const char *crypt_get_dir(void);
|
|
|
|
/**
|
|
* Set library debug level
|
|
*/
|
|
#define CRYPT_DEBUG_ALL -1
|
|
#define CRYPT_DEBUG_NONE 0
|
|
void crypt_set_debug_level(int level);
|
|
|
|
/**
|
|
* OLD DEPRECATED API **********************************
|
|
*
|
|
* Provided only for backward compatibility.
|
|
*/
|
|
|
|
struct interface_callbacks {
|
|
int (*yesDialog)(char *msg);
|
|
void (*log)(int level, char *msg);
|
|
};
|
|
|
|
#define CRYPT_FLAG_VERIFY (1 << 0)
|
|
#define CRYPT_FLAG_READONLY (1 << 1)
|
|
#define CRYPT_FLAG_VERIFY_IF_POSSIBLE (1 << 2)
|
|
#define CRYPT_FLAG_VERIFY_ON_DELKEY (1 << 3)
|
|
#define CRYPT_FLAG_NON_EXCLUSIVE_ACCESS (1 << 4)
|
|
|
|
struct crypt_options {
|
|
const char *name;
|
|
const char *device;
|
|
|
|
const char *cipher;
|
|
const char *hash;
|
|
|
|
const char *passphrase;
|
|
int passphrase_fd;
|
|
const char *key_file;
|
|
const char *new_key_file;
|
|
int key_size;
|
|
|
|
unsigned int flags;
|
|
int key_slot;
|
|
|
|
uint64_t size;
|
|
uint64_t offset;
|
|
uint64_t skip;
|
|
uint64_t iteration_time;
|
|
uint64_t timeout;
|
|
|
|
uint64_t align_payload;
|
|
int tries;
|
|
|
|
struct interface_callbacks *icb;
|
|
};
|
|
|
|
int crypt_create_device(struct crypt_options *options);
|
|
int crypt_update_device(struct crypt_options *options);
|
|
int crypt_resize_device(struct crypt_options *options);
|
|
int crypt_query_device(struct crypt_options *options);
|
|
int crypt_remove_device(struct crypt_options *options);
|
|
int crypt_luksFormat(struct crypt_options *options);
|
|
int crypt_luksOpen(struct crypt_options *options);
|
|
int crypt_luksKillSlot(struct crypt_options *options);
|
|
int crypt_luksRemoveKey(struct crypt_options *options);
|
|
int crypt_luksAddKey(struct crypt_options *options);
|
|
int crypt_luksUUID(struct crypt_options *options);
|
|
int crypt_isLuks(struct crypt_options *options);
|
|
int crypt_luksDump(struct crypt_options *options);
|
|
|
|
void crypt_put_options(struct crypt_options *options);
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
#endif /* _LIBCRYPTSETUP_H */
|