LXR busybox/util-linux/volume

   1/*
   2 * volume_id - reads filesystem label and uuid
   3 *
   4 * Copyright (C) 2005 W. Michael Petullo <mike@flyn.org>
   5 *
   6 *      This library is free software; you can redistribute it and/or
   7 *      modify it under the terms of the GNU Lesser General Public
   8 *      License as published by the Free Software Foundation; either
   9 *      version 2.1 of the License, or (at your option) any later version.
  10 *
  11 *      This library is distributed in the hope that it will be useful,
  12 *      but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14 *      Lesser General Public License for more details.
  15 *
  16 *      You should have received a copy of the GNU Lesser General Public
  17 *      License along with this library; if not, write to the Free Software
  18 *      Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  19 */
  20
  21#include "volume_id_internal.h"
  22
  23#define LUKS_MAGIC_L             6
  24#define UUID_STRING_L           40
  25#define LUKS_CIPHERNAME_L       32
  26#define LUKS_CIPHERMODE_L       32
  27#define LUKS_HASHSPEC_L         32
  28#define LUKS_DIGESTSIZE         20
  29#define LUKS_SALTSIZE           32
  30#define LUKS_NUMKEYS             8
  31
  32static const uint8_t LUKS_MAGIC[] = { 'L','U','K','S', 0xba, 0xbe };
  33
  34struct luks_phdr {
  35        uint8_t         magic[LUKS_MAGIC_L];
  36        uint16_t        version;
  37        uint8_t         cipherName[LUKS_CIPHERNAME_L];
  38        uint8_t         cipherMode[LUKS_CIPHERMODE_L];
  39        uint8_t         hashSpec[LUKS_HASHSPEC_L];
  40        uint32_t        payloadOffset;
  41        uint32_t        keyBytes;
  42        uint8_t         mkDigest[LUKS_DIGESTSIZE];
  43        uint8_t         mkDigestSalt[LUKS_SALTSIZE];
  44        uint32_t        mkDigestIterations;
  45        uint8_t         uuid[UUID_STRING_L];
  46        struct {
  47                uint32_t        active;
  48                uint32_t        passwordIterations;
  49                uint8_t         passwordSalt[LUKS_SALTSIZE];
  50                uint32_t        keyMaterialOffset;
  51                uint32_t        stripes;
  52        } keyblock[LUKS_NUMKEYS];
  53};
  54
  55enum {
  56        EXPECTED_SIZE_luks_phdr = 0
  57                + 1 * LUKS_MAGIC_L
  58                + 2
  59                + 1 * LUKS_CIPHERNAME_L
  60                + 1 * LUKS_CIPHERMODE_L
  61                + 1 * LUKS_HASHSPEC_L
  62                + 4
  63                + 4
  64                + 1 * LUKS_DIGESTSIZE
  65                + 1 * LUKS_SALTSIZE
  66                + 4
  67                + 1 * UUID_STRING_L
  68                + LUKS_NUMKEYS * (0
  69                  + 4
  70                  + 4
  71                  + 1 * LUKS_SALTSIZE
  72                  + 4
  73                  + 4
  74                  )
  75};
  76
  77struct BUG_bad_size_luks_phdr {
  78        char BUG_bad_size_luks_phdr[
  79                sizeof(struct luks_phdr) == EXPECTED_SIZE_luks_phdr ?
  80                1 : -1];
  81};
  82
  83int FAST_FUNC volume_id_probe_luks(struct volume_id *id /*,uint64_t off*/)
  84{
  85#define off ((uint64_t)0)
  86        struct luks_phdr *header;
  87
  88        header = volume_id_get_buffer(id, off, sizeof(*header));
  89        if (header == NULL)
  90                return -1;
  91
  92        if (memcmp(header->magic, LUKS_MAGIC, LUKS_MAGIC_L))
  93                return -1;
  94
  95//      volume_id_set_usage(id, VOLUME_ID_CRYPTO);
  96        volume_id_set_uuid(id, header->uuid, UUID_DCE_STRING);
  97//      id->type = "crypto_LUKS";
  98
  99        return 0;
 100}
 101