| Denis Vlasenko | de7684a | 2008-02-18 21:08:49 +0000 | [diff] [blame^] | 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 SECTOR_SHIFT 9 |
| 24 | #define SECTOR_SIZE (1 << SECTOR_SHIFT) |
| 25 | |
| 26 | #define LUKS_CIPHERNAME_L 32 |
| 27 | #define LUKS_CIPHERMODE_L 32 |
| 28 | #define LUKS_HASHSPEC_L 32 |
| 29 | #define LUKS_DIGESTSIZE 20 |
| 30 | #define LUKS_SALTSIZE 32 |
| 31 | #define LUKS_NUMKEYS 8 |
| 32 | |
| 33 | static const uint8_t LUKS_MAGIC[] = { 'L','U','K','S', 0xba, 0xbe }; |
| 34 | #define LUKS_MAGIC_L 6 |
| 35 | #define LUKS_PHDR_SIZE (sizeof(struct luks_phdr)/SECTOR_SIZE+1) |
| 36 | #define UUID_STRING_L 40 |
| 37 | |
| 38 | struct luks_phdr { |
| 39 | uint8_t magic[LUKS_MAGIC_L]; |
| 40 | uint16_t version; |
| 41 | uint8_t cipherName[LUKS_CIPHERNAME_L]; |
| 42 | uint8_t cipherMode[LUKS_CIPHERMODE_L]; |
| 43 | uint8_t hashSpec[LUKS_HASHSPEC_L]; |
| 44 | uint32_t payloadOffset; |
| 45 | uint32_t keyBytes; |
| 46 | uint8_t mkDigest[LUKS_DIGESTSIZE]; |
| 47 | uint8_t mkDigestSalt[LUKS_SALTSIZE]; |
| 48 | uint32_t mkDigestIterations; |
| 49 | uint8_t uuid[UUID_STRING_L]; |
| 50 | struct { |
| 51 | uint32_t active; |
| 52 | uint32_t passwordIterations; |
| 53 | uint8_t passwordSalt[LUKS_SALTSIZE]; |
| 54 | uint32_t keyMaterialOffset; |
| 55 | uint32_t stripes; |
| 56 | } keyblock[LUKS_NUMKEYS]; |
| 57 | }; |
| 58 | |
| 59 | int volume_id_probe_luks(struct volume_id *id, uint64_t off) |
| 60 | { |
| 61 | struct luks_phdr *header; |
| 62 | |
| 63 | header = volume_id_get_buffer(id, off, LUKS_PHDR_SIZE); |
| 64 | if (header == NULL) |
| 65 | return -1; |
| 66 | |
| 67 | if (memcmp(header->magic, LUKS_MAGIC, LUKS_MAGIC_L)) |
| 68 | return -1; |
| 69 | |
| 70 | volume_id_set_usage(id, VOLUME_ID_CRYPTO); |
| 71 | volume_id_set_uuid(id, header->uuid, UUID_DCE_STRING); |
| 72 | |
| 73 | id->type = "crypto_LUKS"; |
| 74 | |
| 75 | return 0; |
| 76 | } |