From de7684a309ad20c1b889d048d741cb1dd52245f7 Mon Sep 17 00:00:00 2001 From: Denis Vlasenko Date: Mon, 18 Feb 2008 21:08:49 +0000 Subject: support for mount by label (not yet tested) Also adds findfs applet. Closes bug 1143. --- util-linux/volume_id/luks.c | 76 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 76 insertions(+) create mode 100644 util-linux/volume_id/luks.c (limited to 'util-linux/volume_id/luks.c') diff --git a/util-linux/volume_id/luks.c b/util-linux/volume_id/luks.c new file mode 100644 index 000000000..e73ce3a03 --- /dev/null +++ b/util-linux/volume_id/luks.c @@ -0,0 +1,76 @@ +/* + * volume_id - reads filesystem label and uuid + * + * Copyright (C) 2005 W. Michael Petullo + * + * 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 SECTOR_SHIFT 9 +#define SECTOR_SIZE (1 << SECTOR_SHIFT) + +#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 }; +#define LUKS_MAGIC_L 6 +#define LUKS_PHDR_SIZE (sizeof(struct luks_phdr)/SECTOR_SIZE+1) +#define UUID_STRING_L 40 + +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]; +}; + +int volume_id_probe_luks(struct volume_id *id, uint64_t off) +{ + struct luks_phdr *header; + + header = volume_id_get_buffer(id, off, LUKS_PHDR_SIZE); + 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; +} -- cgit v1.2.3