1/* 2 * volume_id - reads filesystem label and uuid 3 * 4 * Copyright (C) 2005 W. Michael Petullo <mike@flyn.org> 5 * 6 * This program is free software; you can redistribute it and/or modify it 7 * under the terms of the GNU General Public License as published by the 8 * Free Software Foundation version 2 of the License. 9 */ 10 11#ifndef _GNU_SOURCE 12#define _GNU_SOURCE 1 13#endif 14 15#ifdef HAVE_CONFIG_H 16# include <config.h> 17#endif 18 19#include <stdio.h> 20#include <stdlib.h> 21#include <unistd.h> 22#include <string.h> 23#include <errno.h> 24#include <ctype.h> 25 26#include "libvolume_id.h" 27#include "util.h" 28 29#define SECTOR_SHIFT 9 30#define SECTOR_SIZE (1 << SECTOR_SHIFT) 31 32#define LUKS_CIPHERNAME_L 32 33#define LUKS_CIPHERMODE_L 32 34#define LUKS_HASHSPEC_L 32 35#define LUKS_DIGESTSIZE 20 36#define LUKS_SALTSIZE 32 37#define LUKS_NUMKEYS 8 38 39#define LUKS_MAGIC_L 6 40#define LUKS_PHDR_SIZE (sizeof(struct luks_phdr)/SECTOR_SIZE+1) 41#define UUID_STRING_L 40 42static const uint8_t LUKS_MAGIC[] = {'L','U','K','S', 0xba, 0xbe}; 43 44struct luks_phdr { 45 uint8_t magic[LUKS_MAGIC_L]; 46 uint16_t version; 47 uint8_t cipherName[LUKS_CIPHERNAME_L]; 48 uint8_t cipherMode[LUKS_CIPHERMODE_L]; 49 uint8_t hashSpec[LUKS_HASHSPEC_L]; 50 uint32_t payloadOffset; 51 uint32_t keyBytes; 52 uint8_t mkDigest[LUKS_DIGESTSIZE]; 53 uint8_t mkDigestSalt[LUKS_SALTSIZE]; 54 uint32_t mkDigestIterations; 55 uint8_t uuid[UUID_STRING_L]; 56 struct { 57 uint32_t active; 58 uint32_t passwordIterations; 59 uint8_t passwordSalt[LUKS_SALTSIZE]; 60 uint32_t keyMaterialOffset; 61 uint32_t stripes; 62 } keyblock[LUKS_NUMKEYS]; 63}; 64 65int volume_id_probe_luks(struct volume_id *id, uint64_t off, uint64_t size) 66{ 67 struct luks_phdr *header; 68 69 header = (struct luks_phdr*) volume_id_get_buffer(id, off, LUKS_PHDR_SIZE); 70 if (header == NULL) 71 return -1; 72 73 if (memcmp(header->magic, LUKS_MAGIC, LUKS_MAGIC_L)) 74 return -1; 75 76 volume_id_set_usage(id, VOLUME_ID_CRYPTO); 77 volume_id_set_uuid(id, header->uuid, 36, UUID_HEX_STRING); 78 id->type = "crypto_LUKS"; 79 return 0; 80} 81