internal.h 7.8 KB
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/*
 * libcryptsetup - cryptsetup library internal
 *
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 * Copyright (C) 2004, Jana Saout <jana@saout.de>
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 * Copyright (C) 2004-2007, Clemens Fruhwirth <clemens@endorphin.org>
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 * Copyright (C) 2009-2018, Red Hat, Inc. All rights reserved.
 * Copyright (C) 2009-2018, Milan Broz
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 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
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 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
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 *
 * 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.
 */

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#ifndef INTERNAL_H
#define INTERNAL_H

#include <stdint.h>
#include <stdarg.h>
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#include <stdbool.h>
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#include <unistd.h>
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#include <inttypes.h>
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#include "nls.h"
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#include "bitops.h"
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#include "utils_blkid.h"
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#include "utils_crypt.h"
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#include "utils_loop.h"
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#include "utils_dm.h"
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#include "utils_fips.h"
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#include "utils_keyring.h"
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#include "utils_io.h"
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#include "crypto_backend.h"
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#include "libcryptsetup.h"

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/* to silent gcc -Wcast-qual for const cast */
#define CONST_CAST(x) (x)(uintptr_t)

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#define SHIFT_4K		12
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#define SECTOR_SHIFT		9
#define SECTOR_SIZE		(1 << SECTOR_SHIFT)
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#define MAX_SECTOR_SIZE		4096 /* min page size among all platforms */
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#define DEFAULT_DISK_ALIGNMENT	1048576 /* 1MiB */
#define DEFAULT_MEM_ALIGNMENT	4096
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#define LOG_MAX_LEN		4096
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#define at_least(a, b) ({ __typeof__(a) __at_least = (a); (__at_least >= (b))?__at_least:(b); })
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#define MISALIGNED(a, b)	((a) & ((b) - 1))
#define MISALIGNED_4K(a)	MISALIGNED((a), 1 << SHIFT_4K)
#define MISALIGNED_512(a)	MISALIGNED((a), 1 << SECTOR_SHIFT)
#define NOTPOW2(a)		MISALIGNED((a), (a))

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#ifndef ARRAY_SIZE
# define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
#endif

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struct crypt_device;

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struct volume_key {
	size_t keylength;
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	const char *key_description;
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	char key[];
};
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struct volume_key *crypt_alloc_volume_key(size_t keylength, const char *key);
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struct volume_key *crypt_generate_volume_key(struct crypt_device *cd, size_t keylength);
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void crypt_free_volume_key(struct volume_key *vk);
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int crypt_volume_key_set_description(struct volume_key *key, const char *key_description);
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struct crypt_pbkdf_type *crypt_get_pbkdf(struct crypt_device *cd);
int init_pbkdf_type(struct crypt_device *cd,
		    const struct crypt_pbkdf_type *pbkdf,
		    const char *dev_type);
int verify_pbkdf_params(struct crypt_device *cd,
			const struct crypt_pbkdf_type *pbkdf);
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int crypt_benchmark_pbkdf_internal(struct crypt_device *cd,
				   struct crypt_pbkdf_type *pbkdf,
				   size_t volume_key_size);

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/* Device backend */
struct device;
int device_alloc(struct device **device, const char *path);
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int device_alloc_no_check(struct device **device, const char *path);
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void device_free(struct device *device);
const char *device_path(const struct device *device);
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const char *device_dm_name(const struct device *device);
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const char *device_block_path(const struct device *device);
void device_topology_alignment(struct device *device,
			    unsigned long *required_alignment, /* bytes */
			    unsigned long *alignment_offset,   /* bytes */
			    unsigned long default_alignment);
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size_t device_block_size(struct device *device);
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int device_read_ahead(struct device *device, uint32_t *read_ahead);
int device_size(struct device *device, uint64_t *size);
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int device_open(struct device *device, int flags);
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void device_disable_direct_io(struct device *device);
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int device_is_identical(struct device *device1, struct device *device2);
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int device_is_rotational(struct device *device);
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size_t device_alignment(struct device *device);
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int device_direct_io(const struct device *device);
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int device_fallocate(struct device *device, uint64_t size);
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void device_sync(struct device *device, int devfd);
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int device_open_locked(struct device *device, int flags);
int device_read_lock(struct crypt_device *cd, struct device *device);
int device_write_lock(struct crypt_device *cd, struct device *device);
void device_read_unlock(struct device *device);
void device_write_unlock(struct device *device);
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enum devcheck { DEV_OK = 0, DEV_EXCL = 1, DEV_SHARED = 2 };
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int device_check_access(struct crypt_device *cd,
			struct device *device,
			enum devcheck device_check);
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int device_block_adjust(struct crypt_device *cd,
			struct device *device,
			enum devcheck device_check,
			uint64_t device_offset,
			uint64_t *size,
			uint32_t *flags);
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size_t size_round_up(size_t size, size_t block);
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/* Receive backend devices from context helpers */
struct device *crypt_metadata_device(struct crypt_device *cd);
struct device *crypt_data_device(struct crypt_device *cd);

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int crypt_confirm(struct crypt_device *cd, const char *msg);
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char *crypt_lookup_dev(const char *dev_id);
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int crypt_dev_is_rotational(int major, int minor);
int crypt_dev_is_partition(const char *dev_path);
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char *crypt_get_partition_device(const char *dev_path, uint64_t offset, uint64_t size);
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char *crypt_get_base_device(const char *dev_path);
uint64_t crypt_dev_partition_offset(const char *dev_path);
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int lookup_by_disk_id(const char *dm_uuid);
int lookup_by_sysfs_uuid_field(const char *dm_uuid, size_t max_len);
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size_t crypt_getpagesize(void);
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unsigned crypt_cpusonline(void);
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uint64_t crypt_getphysmemory_kb(void);
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int init_crypto(struct crypt_device *ctx);
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void logger(struct crypt_device *cd, int level, const char *file, int line, const char *format, ...) __attribute__ ((format (printf, 5, 6)));
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#define log_dbg(x...) logger(NULL, CRYPT_LOG_DEBUG, __FILE__, __LINE__, x)
#define log_std(c, x...) logger(c, CRYPT_LOG_NORMAL, __FILE__, __LINE__, x)
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#define log_verbose(c, x...) logger(c, CRYPT_LOG_VERBOSE, __FILE__, __LINE__, x)
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#define log_err(c, x...) logger(c, CRYPT_LOG_ERROR, __FILE__, __LINE__, x)
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int crypt_get_debug_level(void);

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int crypt_memlock_inc(struct crypt_device *ctx);
int crypt_memlock_dec(struct crypt_device *ctx);
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int crypt_metadata_locking_enabled(void);

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int crypt_random_init(struct crypt_device *ctx);
int crypt_random_get(struct crypt_device *ctx, char *buf, size_t len, int quality);
void crypt_random_exit(void);
int crypt_random_default_key_rng(void);

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int crypt_plain_hash(struct crypt_device *ctx,
		     const char *hash_name,
		     char *key, size_t key_size,
		     const char *passphrase, size_t passphrase_size);
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int PLAIN_activate(struct crypt_device *cd,
		     const char *name,
		     struct volume_key *vk,
		     uint64_t size,
		     uint32_t flags);
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void *crypt_get_hdr(struct crypt_device *cd, const char *type);

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int crypt_wipe_device(struct crypt_device *cd,
	struct device *device,
	crypt_wipe_pattern pattern,
	uint64_t offset,
	uint64_t length,
	size_t wipe_block_size,
	int (*progress)(uint64_t size, uint64_t offset, void *usrptr),
	void *usrptr);
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/* Internal integrity helpers */
const char *crypt_get_integrity(struct crypt_device *cd);
int crypt_get_integrity_key_size(struct crypt_device *cd);
int crypt_get_integrity_tag_size(struct crypt_device *cd);

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int crypt_key_in_keyring(struct crypt_device *cd);
void crypt_set_key_in_keyring(struct crypt_device *cd, unsigned key_in_keyring);
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int crypt_volume_key_load_in_keyring(struct crypt_device *cd, struct volume_key *vk);
int crypt_use_keyring_for_vk(const struct crypt_device *cd);
void crypt_drop_keyring_key(struct crypt_device *cd, const char *key_description);
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static inline uint64_t version(uint16_t major, uint16_t minor, uint16_t patch, uint16_t release)
{
	return (uint64_t)release | ((uint64_t)patch << 16) | ((uint64_t)minor << 32) | ((uint64_t)major << 48);
}

int kernel_version(uint64_t *kversion);

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#endif /* INTERNAL_H */