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84 lines
1.9 KiB
C
84 lines
1.9 KiB
C
/*
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* volume_id - reads filesystem label and uuid
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*
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* Copyright (C) 2005 W. Michael Petullo <mike@flyn.org>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation version 2 of the License.
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*/
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#ifndef _GNU_SOURCE
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#define _GNU_SOURCE 1
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#endif
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <errno.h>
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#include <ctype.h>
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#include "volume_id.h"
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#include "util.h"
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#include "logging.h"
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#define SECTOR_SHIFT 9
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#define SECTOR_SIZE (1 << SECTOR_SHIFT)
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#define LUKS_CIPHERNAME_L 32
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#define LUKS_CIPHERMODE_L 32
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#define LUKS_HASHSPEC_L 32
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#define LUKS_DIGESTSIZE 20
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#define LUKS_SALTSIZE 32
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#define LUKS_NUMKEYS 8
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const uint8_t LUKS_MAGIC[] = {'L','U','K','S', 0xba, 0xbe};
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#define LUKS_MAGIC_L 6
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#define LUKS_PHDR_SIZE (sizeof(struct luks_phdr)/SECTOR_SIZE+1)
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#define UUID_STRING_L 40
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struct luks_phdr {
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uint8_t magic[LUKS_MAGIC_L];
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uint16_t version;
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uint8_t cipherName[LUKS_CIPHERNAME_L];
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uint8_t cipherMode[LUKS_CIPHERMODE_L];
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uint8_t hashSpec[LUKS_HASHSPEC_L];
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uint32_t payloadOffset;
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uint32_t keyBytes;
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uint8_t mkDigest[LUKS_DIGESTSIZE];
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uint8_t mkDigestSalt[LUKS_SALTSIZE];
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uint32_t mkDigestIterations;
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uint8_t uuid[UUID_STRING_L];
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struct {
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uint32_t active;
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uint32_t passwordIterations;
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uint8_t passwordSalt[LUKS_SALTSIZE];
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uint32_t keyMaterialOffset;
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uint32_t stripes;
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} keyblock[LUKS_NUMKEYS];
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};
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int volume_id_probe_luks(struct volume_id *id, uint64_t off)
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{
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struct luks_phdr *header;
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header = (struct luks_phdr*) volume_id_get_buffer(id, off, LUKS_PHDR_SIZE);
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if (header == NULL)
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return -1;
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if (memcmp(header->magic, LUKS_MAGIC, LUKS_MAGIC_L))
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return -1;
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volume_id_set_usage(id, VOLUME_ID_CRYPTO);
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volume_id_set_uuid(id, header->uuid, UUID_DCE_STRING);
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id->type = "crypto_LUKS";
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return 0;
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}
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