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142 lines
4.2 KiB
C
142 lines
4.2 KiB
C
/*
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* QEMU Crypto block device encryption LUKS format
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*
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* Copyright (c) 2015-2016 Red Hat, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include "qapi/error.h"
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#include "qemu/bswap.h"
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#include "block-luks.h"
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#include "crypto/hash.h"
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#include "crypto/afsplit.h"
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#include "crypto/pbkdf.h"
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#include "crypto/secret.h"
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#include "crypto/random.h"
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#include "qemu/uuid.h"
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#include "qemu/bitmap.h"
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/*
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* Reference for the LUKS format implemented here is
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*
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* docs/on-disk-format.pdf
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*
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* in 'cryptsetup' package source code
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*
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* This file implements the 1.2.1 specification, dated
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* Oct 16, 2011.
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*/
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typedef struct QCryptoBlockLUKSHeader QCryptoBlockLUKSHeader;
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typedef struct QCryptoBlockLUKSKeySlot QCryptoBlockLUKSKeySlot;
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/* The following constants are all defined by the LUKS spec */
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#define QCRYPTO_BLOCK_LUKS_VERSION 1
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#define QCRYPTO_BLOCK_LUKS_MAGIC_LEN 6
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#define QCRYPTO_BLOCK_LUKS_CIPHER_NAME_LEN 32
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#define QCRYPTO_BLOCK_LUKS_CIPHER_MODE_LEN 32
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#define QCRYPTO_BLOCK_LUKS_HASH_SPEC_LEN 32
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#define QCRYPTO_BLOCK_LUKS_DIGEST_LEN 20
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#define QCRYPTO_BLOCK_LUKS_SALT_LEN 32
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#define QCRYPTO_BLOCK_LUKS_UUID_LEN 40
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#define QCRYPTO_BLOCK_LUKS_NUM_KEY_SLOTS 8
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#define QCRYPTO_BLOCK_LUKS_STRIPES 4000
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#define QCRYPTO_BLOCK_LUKS_MIN_SLOT_KEY_ITERS 1000
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#define QCRYPTO_BLOCK_LUKS_MIN_MASTER_KEY_ITERS 1000
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#define QCRYPTO_BLOCK_LUKS_KEY_SLOT_OFFSET 4096
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#define QCRYPTO_BLOCK_LUKS_KEY_SLOT_DISABLED 0x0000DEAD
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#define QCRYPTO_BLOCK_LUKS_KEY_SLOT_ENABLED 0x00AC71F3
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#define QCRYPTO_BLOCK_LUKS_SECTOR_SIZE 512LL
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#define QCRYPTO_BLOCK_LUKS_DEFAULT_ITER_TIME_MS 2000
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#define QCRYPTO_BLOCK_LUKS_ERASE_ITERATIONS 40
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static const char qcrypto_block_luks_magic[QCRYPTO_BLOCK_LUKS_MAGIC_LEN] = {
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'L', 'U', 'K', 'S', 0xBA, 0xBE
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};
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/*
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* This struct is written to disk in big-endian format,
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* but operated upon in native-endian format.
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*/
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struct QCryptoBlockLUKSKeySlot {
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/* state of keyslot, enabled/disable */
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uint32_t active;
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/* iterations for PBKDF2 */
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uint32_t iterations;
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/* salt for PBKDF2 */
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uint8_t salt[QCRYPTO_BLOCK_LUKS_SALT_LEN];
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/* start sector of key material */
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uint32_t key_offset_sector;
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/* number of anti-forensic stripes */
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uint32_t stripes;
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};
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/*
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* This struct is written to disk in big-endian format,
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* but operated upon in native-endian format.
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*/
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struct QCryptoBlockLUKSHeader {
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/* 'L', 'U', 'K', 'S', '0xBA', '0xBE' */
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char magic[QCRYPTO_BLOCK_LUKS_MAGIC_LEN];
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/* LUKS version, currently 1 */
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uint16_t version;
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/* cipher name specification (aes, etc) */
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char cipher_name[QCRYPTO_BLOCK_LUKS_CIPHER_NAME_LEN];
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/* cipher mode specification (cbc-plain, xts-essiv:sha256, etc) */
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char cipher_mode[QCRYPTO_BLOCK_LUKS_CIPHER_MODE_LEN];
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/* hash specification (sha256, etc) */
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char hash_spec[QCRYPTO_BLOCK_LUKS_HASH_SPEC_LEN];
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/* start offset of the volume data (in 512 byte sectors) */
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uint32_t payload_offset_sector;
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/* Number of key bytes */
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uint32_t master_key_len;
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/* master key checksum after PBKDF2 */
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uint8_t master_key_digest[QCRYPTO_BLOCK_LUKS_DIGEST_LEN];
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/* salt for master key PBKDF2 */
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uint8_t master_key_salt[QCRYPTO_BLOCK_LUKS_SALT_LEN];
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/* iterations for master key PBKDF2 */
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uint32_t master_key_iterations;
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/* UUID of the partition in standard ASCII representation */
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uint8_t uuid[QCRYPTO_BLOCK_LUKS_UUID_LEN];
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/* key slots */
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QCryptoBlockLUKSKeySlot key_slots[QCRYPTO_BLOCK_LUKS_NUM_KEY_SLOTS];
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};
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void
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qcrypto_block_luks_to_disk_endian(QCryptoBlockLUKSHeader *hdr);
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void
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qcrypto_block_luks_from_disk_endian(QCryptoBlockLUKSHeader *hdr);
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