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https://gitlab.com/cryptsetup/cryptsetup.git
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7835b365a7
http://www.gnu.org/licenses/old-licenses/gpl-2.0.html git-svn-id: https://cryptsetup.googlecode.com/svn/trunk@671 36d66b0a-2a48-0410-832c-cd162a569da5
46 lines
1.6 KiB
Bash
Executable File
46 lines
1.6 KiB
Bash
Executable File
#!/bin/bash
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# Try to get LUKS info and master key from active mapping and prepare parameters for cryptsetup.
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#
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# Copyright (C) 2010,2011 Milan Broz <asi@ucw.cz>
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#
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# This copyrighted material is made available to anyone wishing to use,
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# modify, copy, or redistribute it subject to the terms and conditions
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# of the GNU General Public License v.2.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software Foundation,
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# Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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#
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fail() { echo -e $1 ; exit 1 ; }
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field() { echo $(dmsetup table --target crypt --showkeys $DEVICE | sed 's/.*: //' | cut -d' ' -f$1) ; }
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field_cryptsetup() { echo $(cryptsetup status $DEVICE | grep $1 | sed "s/.*$1:\s*//;s/\ .*//") ; }
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which xxd >/dev/null || fail "You need xxd (part of vim package) installed to convert key."
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[ -z "$2" ] && fail "Recover LUKS header from active mapping, use:\n $0 crypt_mapped_device mk_file_name"
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DEVICE=$1
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MK_FILE=$2
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[ -z "$(field 4)" ] && fail "Mapping $1 not active or it is not crypt target."
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# FIXME:
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# - add UUID
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# - check for CRYPT-LUKS1-* DM-UUID
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CIPHER=$(field_cryptsetup cipher)
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OFFSET=$(field_cryptsetup offset)
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REAL_DEVICE=$(field_cryptsetup device)
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KEY_SIZE=$(field_cryptsetup keysize)
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KEY=$(field 5)
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[ -z "$CIPHER" -o -z "$OFFSET" -o "$OFFSET" -le 383 -o -z "$KEY" ] && fail "Incompatible device, sorry."
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echo "Generating master key to file $MK_FILE."
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echo -E -n $KEY| xxd -r -p >$MK_FILE
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echo "You can now try to reformat LUKS device using:"
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echo " cryptsetup luksFormat -c $CIPHER -s $KEY_SIZE --align-payload=$OFFSET --master-key-file=$MK_FILE $REAL_DEVICE"
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