/* * volume_id - reads filesystem label and uuid * * Copyright (C) 2005 W. Michael Petullo <mike@flyn.org> * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #include "volume_id_internal.h" #define LUKS_MAGIC_L 6 #define UUID_STRING_L 40 #define LUKS_CIPHERNAME_L 32 #define LUKS_CIPHERMODE_L 32 #define LUKS_HASHSPEC_L 32 #define LUKS_DIGESTSIZE 20 #define LUKS_SALTSIZE 32 #define LUKS_NUMKEYS 8 static const uint8_t LUKS_MAGIC[] = { 'L','U','K','S', 0xba, 0xbe }; struct luks_phdr { uint8_t magic[LUKS_MAGIC_L]; uint16_t version; uint8_t cipherName[LUKS_CIPHERNAME_L]; uint8_t cipherMode[LUKS_CIPHERMODE_L]; uint8_t hashSpec[LUKS_HASHSPEC_L]; uint32_t payloadOffset; uint32_t keyBytes; uint8_t mkDigest[LUKS_DIGESTSIZE]; uint8_t mkDigestSalt[LUKS_SALTSIZE]; uint32_t mkDigestIterations; uint8_t uuid[UUID_STRING_L]; struct { uint32_t active; uint32_t passwordIterations; uint8_t passwordSalt[LUKS_SALTSIZE]; uint32_t keyMaterialOffset; uint32_t stripes; } keyblock[LUKS_NUMKEYS]; }; enum { EXPECTED_SIZE_luks_phdr = 0 + 1 * LUKS_MAGIC_L + 2 + 1 * LUKS_CIPHERNAME_L + 1 * LUKS_CIPHERMODE_L + 1 * LUKS_HASHSPEC_L + 4 + 4 + 1 * LUKS_DIGESTSIZE + 1 * LUKS_SALTSIZE + 4 + 1 * UUID_STRING_L + LUKS_NUMKEYS * (0 + 4 + 4 + 1 * LUKS_SALTSIZE + 4 + 4 ) }; struct BUG_bad_size_luks_phdr { char BUG_bad_size_luks_phdr[ sizeof(struct luks_phdr) == EXPECTED_SIZE_luks_phdr ? 1 : -1]; }; int FAST_FUNC volume_id_probe_luks(struct volume_id *id /*,uint64_t off*/) { #define off ((uint64_t)0) struct luks_phdr *header; header = volume_id_get_buffer(id, off, sizeof(*header)); if (header == NULL) return -1; if (memcmp(header->magic, LUKS_MAGIC, LUKS_MAGIC_L)) return -1; // volume_id_set_usage(id, VOLUME_ID_CRYPTO); volume_id_set_uuid(id, header->uuid, UUID_DCE_STRING); // id->type = "crypto_LUKS"; return 0; }