#!/bin/sh -e
#
# Univention SSH
#  Create new OpenSSH hosts keys
#
# Copyright 2004-2015 Univention GmbH
#
# http://www.univention.de/
#
# All rights reserved.
#
# The source code of this program is made available
# under the terms of the GNU Affero General Public License version 3
# (GNU AGPL V3) as published by the Free Software Foundation.
#
# Binary versions of this program provided by Univention to you as
# well as other copyrighted, protected or trademarked materials like
# Logos, graphics, fonts, specific documentations and configurations,
# cryptographic keys etc. are subject to a license agreement between
# you and Univention and not subject to the GNU AGPL V3.
#
# In the case you use this program under the terms of the GNU AGPL V3,
# the program is provided 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 Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public
# License with the Debian GNU/Linux or Univention distribution in file
# /usr/share/common-licenses/AGPL-3; if not, see
# <http://www.gnu.org/licenses/>.

eval "$(ucr shell sshd/hostkeys/bits)"

if [ -n "${sshd_hostkeys_bits}" ]; then
	bits="${sshd_hostkeys_bits}"
else
	bits=2048
fi


# Check for deprecated RSA1 key used for SSHv1
if [ -f /etc/ssh/ssh_host_key ]; then
	echo "WARNING: Deprecated RSA1 key found: /etc/ssh/ssh_host_key"
	echo "You should consider deleting this key due to security concerns."
	
	echo "Storing backup copy of /etc/ssh/ssh_host_key"
	mv /etc/ssh/ssh_host_key /etc/ssh/ssh_host_key.backup-copy

	echo "Recreating deprecated RSA1 host key"
	ssh-keygen -q -f /etc/ssh/ssh_host_key -N '' -t rsa1
	echo ""
fi

# Check for deprecated DSA key
if [ -f /etc/ssh/ssh_host_dsa_key ]; then
	echo "WARNING: Deprecated DSA key found: /etc/ssh/ssh_host_dsa_key"
	echo "You should consider deleting this key due to security concerns."
	
	echo "Storing backup copy of /etc/ssh/ssh_host_dsa_key"
	mv /etc/ssh/ssh_host_dsa_key /etc/ssh/ssh_host_dsa_key.backup-copy

	echo "Recreating deprecated DSA host key"
	ssh-keygen -q -f /etc/ssh/ssh_host_dsa_key -N '' -t dsa
	echo ""
fi

# Check for RSA key
if [ -f /etc/ssh/ssh_host_rsa_key ]; then
	echo "Storing backup copy of /etc/ssh/ssh_host_rsa_key"
	mv /etc/ssh/ssh_host_rsa_key /etc/ssh/ssh_host_rsa_key.backup-copy

	echo "Recreating RSA host key"
	ssh-keygen -q -f /etc/ssh/ssh_host_rsa_key -N '' -t rsa -b "${bits}"
	echo ""
else
	echo "No default RSA host key found. Creating a new one."
	ssh-keygen -q -f /etc/ssh/ssh_host_rsa_key -N '' -t rsa -b "${bits}"
fi
