1 | /*
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2 | * volume_id - reads filesystem label and uuid
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3 | *
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4 | * Copyright (C) 2005 W. Michael Petullo <mike@flyn.org>
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5 | *
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6 | * This library is free software; you can redistribute it and/or
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7 | * modify it under the terms of the GNU Lesser General Public
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8 | * License as published by the Free Software Foundation; either
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9 | * version 2.1 of the License, or (at your option) any later version.
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10 | *
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11 | * This library is distributed in the hope that it will be useful,
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12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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14 | * Lesser General Public License for more details.
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15 | *
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16 | * You should have received a copy of the GNU Lesser General Public
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17 | * License along with this library; if not, write to the Free Software
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18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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19 | */
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20 |
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21 | //kbuild:lib-$(CONFIG_FEATURE_VOLUMEID_LUKS) += luks.o
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22 |
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23 | //config:
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24 | //config:config FEATURE_VOLUMEID_LUKS
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25 | //config: bool "luks filesystem"
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26 | //config: default y
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27 | //config: depends on VOLUMEID
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28 | //config: help
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29 | //config: TODO
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30 | //config:
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31 |
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32 | #include "volume_id_internal.h"
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33 |
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34 | #define LUKS_MAGIC_L 6
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35 | #define UUID_STRING_L 40
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36 | #define LUKS_CIPHERNAME_L 32
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37 | #define LUKS_CIPHERMODE_L 32
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38 | #define LUKS_HASHSPEC_L 32
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39 | #define LUKS_DIGESTSIZE 20
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40 | #define LUKS_SALTSIZE 32
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41 | #define LUKS_NUMKEYS 8
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42 |
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43 | static const uint8_t LUKS_MAGIC[] ALIGN1 = { 'L','U','K','S', 0xba, 0xbe };
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44 |
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45 | struct luks_phdr {
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46 | uint8_t magic[LUKS_MAGIC_L];
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47 | uint16_t version;
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48 | uint8_t cipherName[LUKS_CIPHERNAME_L];
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49 | uint8_t cipherMode[LUKS_CIPHERMODE_L];
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50 | uint8_t hashSpec[LUKS_HASHSPEC_L];
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51 | uint32_t payloadOffset;
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52 | uint32_t keyBytes;
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53 | uint8_t mkDigest[LUKS_DIGESTSIZE];
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54 | uint8_t mkDigestSalt[LUKS_SALTSIZE];
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55 | uint32_t mkDigestIterations;
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56 | uint8_t uuid[UUID_STRING_L];
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57 | struct {
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58 | uint32_t active;
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59 | uint32_t passwordIterations;
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60 | uint8_t passwordSalt[LUKS_SALTSIZE];
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61 | uint32_t keyMaterialOffset;
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62 | uint32_t stripes;
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63 | } keyblock[LUKS_NUMKEYS];
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64 | };
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65 |
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66 | enum {
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67 | EXPECTED_SIZE_luks_phdr = 0
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68 | + 1 * LUKS_MAGIC_L
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69 | + 2
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70 | + 1 * LUKS_CIPHERNAME_L
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71 | + 1 * LUKS_CIPHERMODE_L
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72 | + 1 * LUKS_HASHSPEC_L
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73 | + 4
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74 | + 4
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75 | + 1 * LUKS_DIGESTSIZE
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76 | + 1 * LUKS_SALTSIZE
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77 | + 4
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78 | + 1 * UUID_STRING_L
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79 | + LUKS_NUMKEYS * (0
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80 | + 4
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81 | + 4
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82 | + 1 * LUKS_SALTSIZE
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83 | + 4
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84 | + 4
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85 | )
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86 | };
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87 |
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88 | struct BUG_bad_size_luks_phdr {
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89 | char BUG_bad_size_luks_phdr[
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90 | sizeof(struct luks_phdr) == EXPECTED_SIZE_luks_phdr ?
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91 | 1 : -1];
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92 | };
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93 |
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94 | int FAST_FUNC volume_id_probe_luks(struct volume_id *id /*,uint64_t off*/)
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95 | {
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96 | #define off ((uint64_t)0)
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97 | struct luks_phdr *header;
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98 |
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99 | header = volume_id_get_buffer(id, off, sizeof(*header));
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100 | if (header == NULL)
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101 | return -1;
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102 |
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103 | if (memcmp(header->magic, LUKS_MAGIC, LUKS_MAGIC_L))
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104 | return -1;
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105 |
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106 | // volume_id_set_usage(id, VOLUME_ID_CRYPTO);
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107 | volume_id_set_uuid(id, header->uuid, UUID_DCE_STRING);
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108 | IF_FEATURE_BLKID_TYPE(id->type = "crypto_LUKS";)
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109 |
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110 | return 0;
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111 | }
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