Mini Shell
#!/usr/bin/sh
command -v getarg > /dev/null || . /lib/dracut-lib.sh
# check if the crypttab contains an entry for a LUKS UUID
crypttab_contains() {
local luks="$1"
local dev="$2"
local l d rest
if [ -f /etc/crypttab ]; then
while read -r l d rest || [ -n "$l" ]; do
strstr "${l##luks-}" "${luks##luks-}" && return 0
strstr "$d" "${luks##luks-}" && return 0
if [ -n "$dev" ]; then
for _dev in $(devnames "$d"); do
[ "$dev" -ef "$_dev" ] && return 0
done
fi
if [ -e /etc/block_uuid.map ]; then
# search for line starting with $d
_line=$(sed -n "\,^$d .*$,{p}" /etc/block_uuid.map)
[ -z "$_line" ] && continue
# get second column with uuid
_uuid="$(echo "$_line" | sed 's,^.* \(.*$\),\1,')"
strstr "$_uuid" "${luks##luks-}" && return 0
fi
done < /etc/crypttab
fi
return 1
}
# ask_for_password
#
# Wraps around plymouth ask-for-password and adds fallback to tty password ask
# if plymouth is not present.
#
# --cmd command
# Command to execute. Required.
# --prompt prompt
# Password prompt. Note that function already adds ':' at the end.
# Recommended.
# --tries n
# How many times repeat command on its failure. Default is 3.
# --ply-[cmd|prompt|tries]
# Command/prompt/tries specific for plymouth password ask only.
# --tty-[cmd|prompt|tries]
# Command/prompt/tries specific for tty password ask only.
# --tty-echo-off
# Turn off input echo before tty command is executed and turn on after.
# It's useful when password is read from stdin.
ask_for_password() {
local ply_cmd
local ply_prompt
local ply_tries=3
local tty_cmd
local tty_prompt
local tty_tries=3
local ret
while [ $# -gt 0 ]; do
case "$1" in
--cmd)
ply_cmd="$2"
tty_cmd="$2"
shift
;;
--ply-cmd)
ply_cmd="$2"
shift
;;
--tty-cmd)
tty_cmd="$2"
shift
;;
--prompt)
ply_prompt="$2"
tty_prompt="$2"
shift
;;
--ply-prompt)
ply_prompt="$2"
shift
;;
--tty-prompt)
tty_prompt="$2"
shift
;;
--tries)
ply_tries="$2"
tty_tries="$2"
shift
;;
--ply-tries)
ply_tries="$2"
shift
;;
--tty-tries)
tty_tries="$2"
shift
;;
--tty-echo-off) tty_echo_off=yes ;;
esac
shift
done
{
flock -s 9
# Prompt for password with plymouth, if installed and running.
if type plymouth > /dev/null 2>&1 && plymouth --ping 2> /dev/null; then
plymouth ask-for-password \
--prompt "$ply_prompt" --number-of-tries="$ply_tries" \
--command="$ply_cmd"
ret=$?
else
if [ "$tty_echo_off" = yes ]; then
stty_orig="$(stty -g)"
stty -echo
fi
local i=1
while [ $i -le "$tty_tries" ]; do
[ -n "$tty_prompt" ] \
&& printf "%s" "$tty_prompt [$i/$tty_tries]:" >&2
eval "$tty_cmd" && ret=0 && break
ret=$?
i=$((i + 1))
[ -n "$tty_prompt" ] && printf '\n' >&2
done
[ "$tty_echo_off" = yes ] && stty "$stty_orig"
fi
} 9> /.console_lock
[ $ret -ne 0 ] && echo "Wrong password" >&2
return $ret
}
# Try to mount specified device (by path, by UUID or by label) and check
# the path with 'test'.
#
# example:
# test_dev -f LABEL="nice label" /some/file1
test_dev() {
local test_op=$1
local dev="$2"
local f="$3"
local ret=1
local mount_point
mount_point=$(mkuniqdir /mnt testdev)
[ -n "$dev" -a -n "$*" ] || return 1
[ -d "$mount_point" ] || die 'Mount point does not exist!'
if mount -r "$dev" "$mount_point" > /dev/null 2>&1; then
test "$test_op" "${mount_point}/${f}"
ret=$?
umount "$mount_point"
fi
rmdir "$mount_point"
return $ret
}
# match_dev devpattern dev
#
# Returns true if 'dev' matches 'devpattern'. Both 'devpattern' and 'dev' are
# expanded to kernel names and then compared. If name of 'dev' is on list of
# names of devices matching 'devpattern', the test is positive. 'dev' and
# 'devpattern' may be anything which function 'devnames' recognizes.
#
# If 'devpattern' is empty or '*' then function just returns true.
#
# Example:
# match_dev UUID=123 /dev/dm-1
# Returns true if /dev/dm-1 UUID starts with "123".
match_dev() {
[ -z "$1" -o "$1" = '*' ] && return 0
local devlist
local dev
devlist="$(devnames "$1")" || return 255
dev="$(devnames "$2")" || return 255
strstr "
$devlist
" "
$dev
"
}
# getkey keysfile for_dev
#
# Reads file <keysfile> produced by probe-keydev and looks for first line to
# which device <for_dev> matches. The successful result is printed in format
# "<keydev>:<keypath>". When nothing found, just false is returned.
#
# Example:
# getkey /tmp/luks.keys /dev/sdb1
# May print:
# /dev/sdc1:/keys/some.key
getkey() {
local keys_file="$1"
local for_dev="$2"
local luks_dev
local key_dev
local key_path
[ -z "$keys_file" -o -z "$for_dev" ] && die 'getkey: wrong usage!'
[ -f "$keys_file" ] || return 1
while IFS=: read -r luks_dev key_dev key_path _ || [ -n "$luks_dev" ]; do
if match_dev "$luks_dev" "$for_dev"; then
echo "${key_dev}:${key_path}"
return 0
fi
done < "$keys_file"
return 1
}
# readkey keypath keydev device
#
# Mounts <keydev>, reads key from file <keypath>, optionally processes it (e.g.
# if encrypted with GPG) and prints to standard output which is supposed to be
# read by cryptsetup. <device> is just passed to helper function for
# informational purpose.
readkey() {
local keypath="$1"
local keydev="$2"
local device="$3"
# No mounting needed if the keyfile resides inside the initrd
if [ "/" = "$keydev" ]; then
local mntp=/
else
# This creates a unique single mountpoint for *, or several for explicitly
# given LUKS devices. It accomplishes unlocking multiple LUKS devices with
# a single password entry.
local mntp
mntp="/mnt/$(str_replace "keydev-$keydev-$keypath" '/' '-')"
if [ ! -d "$mntp" ]; then
mkdir -p "$mntp"
mount -r "$keydev" "$mntp" || die 'Mounting rem. dev. failed!'
fi
fi
case "${keypath##*.}" in
gpg)
if [ -f /lib/dracut-crypt-gpg-lib.sh ]; then
. /lib/dracut-crypt-gpg-lib.sh
gpg_decrypt "$mntp" "$keypath" "$keydev" "$device"
else
die "No GPG support to decrypt '$keypath' on '$keydev'."
fi
;;
img)
if [ -f /lib/dracut-crypt-loop-lib.sh ]; then
. /lib/dracut-crypt-loop-lib.sh
loop_decrypt "$mntp" "$keypath" "$keydev" "$device"
printf "%s\n" "umount \"$mntp\"; rmdir \"$mntp\";" > "${hookdir}/cleanup/crypt-loop-cleanup-99-${mntp##*/}".sh
return 0
else
die "No loop file support to decrypt '$keypath' on '$keydev'."
fi
;;
*) cat "$mntp/$keypath" ;;
esac
# No unmounting if the keyfile resides inside the initrd
if [ "/" != "$keydev" ]; then
# General unmounting mechanism, modules doing custom cleanup should return earlier
# and install a pre-pivot cleanup hook
umount "$mntp"
rmdir "$mntp"
fi
}
Zerion Mini Shell 1.0