/mandos/release

#!/bin/sh

# This script can be called in the following ways:

#

# After the package was installed:

#       <postinst> configure <old-version>

#

#

# If prerm fails during upgrade or fails on failed upgrade:

#       <old-postinst> abort-upgrade <new-version>

#

# If prerm fails during deconfiguration of a package:

#       <postinst> abort-deconfigure in-favour <new-package> <version>

#                  removing <old-package> <version>

#

# If prerm fails during replacement due to conflict:

#       <postinst> abort-remove in-favour <new-package> <version>

set -e

# Update the initial RAM file system image

update_initramfs()

{

    if [ -x /usr/sbin/update-initramfs ]; then

	update-initramfs -u -k all

    fi

    if dpkg --compare-versions "$2" lt-nl "1.0.10-1"; then

        # Make old initrd.img files unreadable too, in case they were

        # created with mandos-client 1.0.8 or older.

	find /boot -maxdepth 1 -type f -name "initrd.img-*.bak" \

	    -print0 | xargs --null --no-run-if-empty chmod o-r

    fi

}

# Add user and group

add_mandos_user(){

    # Rename old "mandos" user and group

    if dpkg --compare-versions "$2" lt "1.0.3-1"; then

	case "`getent passwd mandos`" in

	    *:Mandos\ password\ system,,,:/nonexistent:/bin/false)

		usermod --login _mandos mandos

		groupmod --new-name _mandos mandos

		return

		;;

	esac

    fi

    # Create new user and group

    if ! getent passwd _mandos >/dev/null; then

	adduser --system --force-badname --quiet --home /nonexistent \

	    --no-create-home --group --disabled-password \

	    --gecos "Mandos password system" _mandos

    fi

}

# Create client key pair

create_key(){

    if [ -r /etc/keys/mandos/pubkey.txt \

	-a -r /etc/keys/mandos/seckey.txt ]; then

	return 0

    fi

    if [ -x /usr/sbin/mandos-keygen ]; then

	mandos-keygen

    fi

}

create_dh_params(){

    if [ -r /etc/keys/mandos/client-dhparams.pem ]; then

	return 0

    fi

    # Create a Diffe-Hellman parameters file

    DHFILE="`mktemp -t mandos-client-dh-parameters.XXXXXXXXXX.pem`"

    # First try certtool from GnuTLS

    if ! certtool --generate-dh-params --sec-param high \

	 --outfile "$DHFILE"; then

	# Otherwise try OpenSSL

	if ! openssl genpkey -genparam -algorithm DH -out "$DHFILE" \

	     -pkeyopt dh_paramgen_prime_len:3072; then

	    # None of the commands succeded; give up

	    rm -- "$DHFILE"

	    return 1

	fi

    fi

    sed --in-place --expression='0,/^-----BEGIN DH PARAMETERS-----$/d' \

	"$DHFILE"

    sed --in-place --expression='1i-----BEGIN DH PARAMETERS-----' \

	    "$DHFILE"

    cp --archive "$DHFILE" /etc/keys/mandos/client-dhparams.pem

    rm -- "$DHFILE"

}

case "$1" in

    configure)

	add_mandos_user "$@"

	create_key "$@"

	create_dh_params "$@" || :

	update_initramfs "$@"

	;;

    abort-upgrade|abort-deconfigure|abort-remove)

	;;

    *)

	echo "$0 called with unknown argument '$1'" 1>&2

	exit 1

	;;

esac

#DEBHELPER#

exit 0