[2725] | 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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[3621] | 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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[2725] | 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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[3621] | 43 | static const uint8_t LUKS_MAGIC[] ALIGN1 = { 'L','U','K','S', 0xba, 0xbe };
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[2725] | 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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[3232] | 108 | IF_FEATURE_BLKID_TYPE(id->type = "crypto_LUKS";)
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[2725] | 109 |
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| 110 | return 0;
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| 111 | }
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