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| Current File : //lib/dracut/modules.d/90crypt/crypt-lib.sh |
#!/bin/sh
# -*- mode: shell-script; indent-tabs-mode: nil; sh-basic-offset: 4; -*-
# ex: ts=8 sw=4 sts=4 et filetype=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="$1"
local l d rest
if [ -f /etc/crypttab ]; then
while read l d rest; do
strstr "${l##luks-}" "${luks##luks-}" && return 0
strstr "$d" "${luks##luks-}" && return 0
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 cmd; local prompt; local tries=3
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 "$tty_prompt [$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="$3"
local ret=1; local mount_point=$(mkuniqdir /mnt testdev)
local path
[ -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
local IFS=:
while read luks_dev key_dev key_path; 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="$3"
# This creates a unique single mountpoint for *, or several for explicitly
# given LUKS devices. It accomplishes unlocking multiple LUKS devices with
# a single password entry.
local mntp="/mnt/$(str_replace "keydev-$keydev-$keypath" '/' '-')"
if [ ! -d "$mntp" ]; then
mkdir "$mntp"
mount -r "$keydev" "$mntp" || die 'Mounting rem. dev. failed!'
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" "$device"
initqueue --onetime --finished --unique --name "crypt-loop-cleanup-99-${mntp##*/}" \
$(command -v umount) "$mntp; " $(command -v rmdir) "$mntp"
return 0
else
die "No loop file support to decrypt '$keypath' on '$keydev'."
fi
;;
*) cat "$mntp/$keypath" ;;
esac
# General unmounting mechanism, modules doing custom cleanup should return earlier
# and install a pre-pivot cleanup hook
umount "$mntp"
rmdir "$mntp"
}