107 lines
2.8 KiB
C
107 lines
2.8 KiB
C
/*
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* volume_id - reads filesystem label and uuid
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*
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* Copyright (C) 2005 W. Michael Petullo <mike@flyn.org>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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//config:config FEATURE_VOLUMEID_LUKS
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//config: bool "luks filesystem"
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//config: default y
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//config: depends on VOLUMEID
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//kbuild:lib-$(CONFIG_FEATURE_VOLUMEID_LUKS) += luks.o
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#include "volume_id_internal.h"
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#define LUKS_MAGIC_L 6
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#define UUID_STRING_L 40
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#define LUKS_CIPHERNAME_L 32
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#define LUKS_CIPHERMODE_L 32
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#define LUKS_HASHSPEC_L 32
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#define LUKS_DIGESTSIZE 20
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#define LUKS_SALTSIZE 32
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#define LUKS_NUMKEYS 8
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static const uint8_t LUKS_MAGIC[] ALIGN1 = { 'L','U','K','S', 0xba, 0xbe };
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struct luks_phdr {
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uint8_t magic[LUKS_MAGIC_L];
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uint16_t version;
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uint8_t cipherName[LUKS_CIPHERNAME_L];
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uint8_t cipherMode[LUKS_CIPHERMODE_L];
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uint8_t hashSpec[LUKS_HASHSPEC_L];
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uint32_t payloadOffset;
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uint32_t keyBytes;
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uint8_t mkDigest[LUKS_DIGESTSIZE];
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uint8_t mkDigestSalt[LUKS_SALTSIZE];
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uint32_t mkDigestIterations;
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uint8_t uuid[UUID_STRING_L];
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struct {
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uint32_t active;
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uint32_t passwordIterations;
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uint8_t passwordSalt[LUKS_SALTSIZE];
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uint32_t keyMaterialOffset;
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uint32_t stripes;
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} keyblock[LUKS_NUMKEYS];
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};
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enum {
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EXPECTED_SIZE_luks_phdr = 0
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+ 1 * LUKS_MAGIC_L
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+ 2
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+ 1 * LUKS_CIPHERNAME_L
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+ 1 * LUKS_CIPHERMODE_L
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+ 1 * LUKS_HASHSPEC_L
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+ 4
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+ 4
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+ 1 * LUKS_DIGESTSIZE
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+ 1 * LUKS_SALTSIZE
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+ 4
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+ 1 * UUID_STRING_L
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+ LUKS_NUMKEYS * (0
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+ 4
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+ 4
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+ 1 * LUKS_SALTSIZE
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+ 4
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+ 4
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)
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};
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struct BUG_bad_size_luks_phdr {
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char BUG_bad_size_luks_phdr[
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sizeof(struct luks_phdr) == EXPECTED_SIZE_luks_phdr ?
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1 : -1];
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};
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int FAST_FUNC volume_id_probe_luks(struct volume_id *id /*,uint64_t off*/)
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{
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#define off ((uint64_t)0)
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struct luks_phdr *header;
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header = volume_id_get_buffer(id, off, sizeof(*header));
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if (header == NULL)
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return -1;
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if (memcmp(header->magic, LUKS_MAGIC, LUKS_MAGIC_L))
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return -1;
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// volume_id_set_usage(id, VOLUME_ID_CRYPTO);
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volume_id_set_uuid(id, header->uuid, UUID_DCE_STRING);
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IF_FEATURE_BLKID_TYPE(id->type = "crypto_LUKS";)
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return 0;
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}
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