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39 lines
1.3 KiB
39 lines
1.3 KiB
#!/bin/sh |
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command -v ask_for_password >/dev/null || . /lib/dracut-crypt-lib.sh |
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# loop_decrypt mnt_point keypath keydev device |
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# |
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# Decrypts symmetrically encrypted key to standard output. |
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# |
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# mnt_point - mount point where <keydev> is already mounted |
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# keypath - LUKS encrypted loop file path relative to <mnt_point> |
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# keydev - device on which key resides; only to display in prompt |
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# device - device to be opened by cryptsetup; only to display in prompt |
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loop_decrypt() { |
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local mntp="$1" |
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local keypath="$2" |
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local keydev="$3" |
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local device="$4" |
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local key="/dev/mapper/${mntp##*/}" |
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if [ ! -b $key ]; then |
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local loopdev=$(losetup -f "${mntp}/${keypath}" --show) |
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local opts="-d - luksOpen $loopdev ${key##*/}" |
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ask_for_password \ |
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--cmd "cryptsetup $opts" \ |
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--prompt "Password ($keypath on $keydev for $device)" \ |
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--tty-echo-off |
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[ -b $key ] || die "Failed to unlock $keypath on $keydev for $device." |
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initqueue --onetime --finished --unique --name "crypt-loop-cleanup-10-${key##*/}" \ |
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$(command -v cryptsetup) "luksClose $key" |
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initqueue --onetime --finished --unique --name "crypt-loop-cleanup-20-${loopdev##*/}" \ |
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$(command -v losetup) "-d $loopdev" |
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fi |
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cat $key |
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}
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