This commit is contained in:
245
dracut/crypt-lib.sh
Executable file
245
dracut/crypt-lib.sh
Executable file
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#!/usr/bin/sh
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command -v getarg >/dev/null || . /lib/dracut-lib.sh
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# check if the crypttab contains an entry for a LUKS UUID
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crypttab_contains() {
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local luks="$1"
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local dev="$2"
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local l d rest
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if [ -f /etc/crypttab ]; then
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while read l d rest || [ -n "$l" ]; do
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strstr "${l##luks-}" "${luks##luks-}" && return 0
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strstr "$d" "${luks##luks-}" && return 0
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if [ -n "$dev" ]; then
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for _dev in $(devnames $d); do
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[ "$dev" -ef "$_dev" ] && return 0
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done
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fi
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if [ -e /etc/block_uuid.map ]; then
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# search for line starting with $d
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_line=$(sed -n "\,^$d .*$,{p}" /etc/block_uuid.map)
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[ -z "$_line" ] && continue
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# get second column with uuid
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_uuid="$(echo $_line | sed 's,^.* \(.*$\),\1,')"
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strstr "$_uuid" "${luks##luks-}" && return 0
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fi
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done < /etc/crypttab
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fi
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return 1
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}
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# ask_for_password
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#
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# Wraps around plymouth ask-for-password and adds fallback to tty password ask
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# if plymouth is not present.
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#
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# --cmd command
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# Command to execute. Required.
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# --prompt prompt
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# Password prompt. Note that function already adds ':' at the end.
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# Recommended.
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# --tries n
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# How many times repeat command on its failure. Default is 3.
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# --ply-[cmd|prompt|tries]
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# Command/prompt/tries specific for plymouth password ask only.
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# --tty-[cmd|prompt|tries]
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# Command/prompt/tries specific for tty password ask only.
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# --tty-echo-off
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# Turn off input echo before tty command is executed and turn on after.
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# It's useful when password is read from stdin.
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ask_for_password() {
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local cmd; local prompt; local tries=3
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local ply_cmd; local ply_prompt; local ply_tries=3
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local tty_cmd; local tty_prompt; local tty_tries=3
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local ret
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while [ $# -gt 0 ]; do
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case "$1" in
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--cmd) ply_cmd="$2"; tty_cmd="$2"; shift;;
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--ply-cmd) ply_cmd="$2"; shift;;
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--tty-cmd) tty_cmd="$2"; shift;;
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--prompt) ply_prompt="$2"; tty_prompt="$2"; shift;;
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--ply-prompt) ply_prompt="$2"; shift;;
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--tty-prompt) tty_prompt="$2"; shift;;
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--tries) ply_tries="$2"; tty_tries="$2"; shift;;
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--ply-tries) ply_tries="$2"; shift;;
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--tty-tries) tty_tries="$2"; shift;;
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--tty-echo-off) tty_echo_off=yes;;
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esac
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shift
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done
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{ flock -s 9;
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# Prompt for password with plymouth, if installed and running.
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if type plymouth >/dev/null 2>&1 && plymouth --ping 2>/dev/null; then
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plymouth ask-for-password \
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--prompt "$ply_prompt" --number-of-tries=$ply_tries \
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--command="$ply_cmd"
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ret=$?
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else
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if [ "$tty_echo_off" = yes ]; then
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stty_orig="$(stty -g)"
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stty -echo
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fi
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local i=1
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while [ $i -le $tty_tries ]; do
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[ -n "$tty_prompt" ] && \
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printf "$tty_prompt [$i/$tty_tries]:" >&2
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eval "$tty_cmd" && ret=0 && break
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ret=$?
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i=$(($i+1))
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[ -n "$tty_prompt" ] && printf '\n' >&2
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done
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[ "$tty_echo_off" = yes ] && stty $stty_orig
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fi
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} 9>/.console_lock
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[ $ret -ne 0 ] && echo "Wrong password" >&2
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return $ret
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}
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# Try to mount specified device (by path, by UUID or by label) and check
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# the path with 'test'.
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#
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# example:
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# test_dev -f LABEL="nice label" /some/file1
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test_dev() {
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local test_op=$1; local dev="$2"; local f="$3"
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local ret=1; local mount_point=$(mkuniqdir /mnt testdev)
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local path
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[ -n "$dev" -a -n "$*" ] || return 1
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[ -d "$mount_point" ] || die 'Mount point does not exist!'
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if mount -r "$dev" "$mount_point" >/dev/null 2>&1; then
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test $test_op "${mount_point}/${f}"
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ret=$?
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umount "$mount_point"
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fi
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rmdir "$mount_point"
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return $ret
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}
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# match_dev devpattern dev
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#
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# Returns true if 'dev' matches 'devpattern'. Both 'devpattern' and 'dev' are
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# expanded to kernel names and then compared. If name of 'dev' is on list of
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# names of devices matching 'devpattern', the test is positive. 'dev' and
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# 'devpattern' may be anything which function 'devnames' recognizes.
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#
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# If 'devpattern' is empty or '*' then function just returns true.
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#
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# Example:
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# match_dev UUID=123 /dev/dm-1
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# Returns true if /dev/dm-1 UUID starts with "123".
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match_dev() {
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[ -z "$1" -o "$1" = '*' ] && return 0
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local devlist; local dev
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devlist="$(devnames "$1")" || return 255
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dev="$(devnames "$2")" || return 255
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strstr "
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$devlist
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" "
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$dev
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"
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}
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# getkey keysfile for_dev
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#
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# Reads file <keysfile> produced by probe-keydev and looks for first line to
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# which device <for_dev> matches. The successful result is printed in format
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# "<keydev>:<keypath>". When nothing found, just false is returned.
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#
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# Example:
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# getkey /tmp/luks.keys /dev/sdb1
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# May print:
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# /dev/sdc1:/keys/some.key
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getkey() {
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local keys_file="$1"; local for_dev="$2"
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local luks_dev; local key_dev; local key_path
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[ -z "$keys_file" -o -z "$for_dev" ] && die 'getkey: wrong usage!'
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[ -f "$keys_file" ] || return 1
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local IFS=:
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while read luks_dev key_dev key_path || [ -n "$luks_dev" ]; do
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if match_dev "$luks_dev" "$for_dev"; then
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echo "${key_dev}:${key_path}"
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return 0
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fi
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done < "$keys_file"
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return 1
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}
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# readkey keypath keydev device
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#
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# Mounts <keydev>, reads key from file <keypath>, optionally processes it (e.g.
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# if encrypted with GPG) and prints to standard output which is supposed to be
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# read by cryptsetup. <device> is just passed to helper function for
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# informational purpose.
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readkey() {
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local keypath="$1"
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local keydev="$2"
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local device="$3"
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# No mounting needed if the keyfile resides inside the initrd
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if [ "/" == "$keydev" ]; then
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local mntp=/
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else
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# This creates a unique single mountpoint for *, or several for explicitly
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# given LUKS devices. It accomplishes unlocking multiple LUKS devices with
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# a single password entry.
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local mntp="/mnt/$(str_replace "keydev-$keydev-$keypath" '/' '-')"
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if [ ! -d "$mntp" ]; then
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mkdir "$mntp"
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mount -r "$keydev" "$mntp" || die 'Mounting rem. dev. failed!'
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fi
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fi
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case "${keypath##*.}" in
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gpg)
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if [ -f /lib/dracut-crypt-gpg-lib.sh ]; then
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. /lib/dracut-crypt-gpg-lib.sh
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gpg_decrypt "$mntp" "$keypath" "$keydev" "$device"
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else
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die "No GPG support to decrypt '$keypath' on '$keydev'."
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fi
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;;
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img)
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if [ -f /lib/dracut-crypt-loop-lib.sh ]; then
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. /lib/dracut-crypt-loop-lib.sh
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loop_decrypt "$mntp" "$keypath" "$keydev" "$device"
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printf "%s\n" "umount \"$mntp\"; rmdir \"$mntp\";" > ${hookdir}/cleanup/"crypt-loop-cleanup-99-${mntp##*/}".sh
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return 0
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else
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die "No loop file support to decrypt '$keypath' on '$keydev'."
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fi
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;;
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fido2)
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if [ -f /lib/dracut-crypt-fido2-lib.sh ]; then
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. /lib/dracut-crypt-fido2-lib.sh
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fido2_decrypt "$mntp" "$keypath" "$keydev" "$device"
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else
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die "No FIDO2 support to decrypt '$keypath' on '$keydev'."
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fi
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;;
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*) cat "$mntp/$keypath" ;;
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esac
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# No unmounting if the keyfile resides inside the initrd
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if [ "/" != "$keydev" ]; then
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# General unmounting mechanism, modules doing custom cleanup should return earlier
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# and install a pre-pivot cleanup hook
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umount "$mntp"
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rmdir "$mntp"
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fi
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}
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