/mandos/trunk

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#!/bin/sh
# 
# Script to get password from plugin-runner to cryptroot-unlock
# 
# Copyright © 2018 Teddy Hogeborn
# Copyright © 2018 Björn Påhlsson
# 
# This file is part of Mandos.
# 
# Mandos is free software: you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
# 
#     Mandos is distributed in the hope that it will be useful, but
#     WITHOUT ANY WARRANTY; without even the implied warranty of
#     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#     GNU General Public License for more details.
# 
# You should have received a copy of the GNU General Public License
# along with Mandos.  If not, see <http://www.gnu.org/licenses/>.
# 
# Contact the authors at <mandos@recompile.se>.

# This script is made to run in the initramfs, and must not be run in
# the normal system environment.

# Temporary file for the password
passfile=$(mktemp -p /run -t mandos.XXXXXX)
trap "rm -f -- $passfile 2>/dev/null" EXIT

# Disable the plugins which conflict with "askpass" as distributed by
# cryptsetup.
cat <<-EOF >>/conf/conf.d/mandos/plugin-runner.conf

	--disable=askpass-fifo
	--disable=password-prompt
	--disable=plymouth
EOF

# In case a password is retrieved by other means than by plugin-runner
# (such as typing it on the console into the prompt given by the
# "askpass" program), this dummy plugin will be made to exit
# successfully, thereby forcing plugin-runner to stop all its plugins
# and also exit itself.
cat <<-EOF > /lib/mandos/plugins.d/dummy
	#!/bin/sh
	
	while [ -e /run/mandos-keep-running ]; do
	    sleep 1
	done
	
	# exit successfully to force plugin-runner to finish
	exit 0
EOF
chmod u=rwx,go=rx /lib/mandos/plugins.d/dummy

# This file is the flag which keeps the dummy plugin running
touch /run/mandos-keep-running

# Keep running plugin-runner and trying any password, until either a
# password is accepted by cryptroot-unlock, or plugin-runner fails, or
# the file /run/mandos-keep-running has been removed.
while command -v cryptroot-unlock >/dev/null 2>&1; do
    /lib/mandos/plugin-runner > "$passfile" &
    echo $! > /run/mandos-plugin-runner.pid
    wait %% || break

    # Try this password ten times (or ten seconds)
    for loop in 1 2 3 4 5 6 7 8 9 10; do
	if [ -e /run/mandos-keep-running ]; then
	    cryptroot-unlock < "$passfile" >/dev/null 2>&1 && break 2
	    sleep 1
	else
	    break 2
	fi
    done
done

exec >/dev/null 2>&1

rm -f /run/mandos-plugin-runner.pid /run/mandos-keep-running