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|
#!/bin/bash
# Fail2ban installation script for Raspbian
#
# Copyleft 2017 by Ignacio Nunez Hernanz <nacho _a_t_ ownyourbits _d_o_t_ com>
# GPL licensed (see end of file) * Use at your own risk!
#
# Usage:
#
# ./installer.sh fail2ban.sh <IP> (<img>)
#
# See installer.sh instructions for details
# More at: https://ownyourbits.com/2017/02/24/nextcloudpi-fail2ban-installer/
#
ACTIVE_=no
# time to ban an IP that exceeded attempts
BANTIME_=600
# cooldown time for incorrect passwords
FINDTIME_=600
# bad attempts before banning an IP
MAXRETRY_=6
# email to send notifications to
EMAIL_=optional@email.com
MAILALERTS_=no
DESCRIPTION="Brute force protection for SSH and NextCloud"
install()
{
apt-get update
apt-get install --no-install-recommends -y fail2ban whois
update-rc.d fail2ban disable
rm -f /etc/fail2ban/jail.d/defaults-debian.conf
[[ "$DOCKERBUILD" == 1 ]] && {
cat > /etc/services-available.d/100fail2ban <<EOF
#!/bin/bash
source /usr/local/etc/library.sh
[[ "\$1" == "stop" ]] && {
echo "stopping fail2ban..."
service fail2ban stop
exit 0
}
persistent_cfg /etc/fail2ban
echo "Starting fail2ban..."
service fail2ban start
exit 0
EOF
chmod +x /etc/services-available.d/100fail2ban
}
# tweak fail2ban email
local F=/etc/fail2ban/action.d/sendmail-common.conf
sed -i 's|Fail2Ban|NextCloudPlus|' /etc/fail2ban/action.d/sendmail-whois-lines.conf
grep -q actionstart_ "$F" || sed -i 's|actionstart|actionstart_|' "$F"
grep -q actionstop_ "$F" || sed -i 's|actionstop|actionstop_|' "$F"
# delay init because of automount
sed -i "/^ExecStart=/iExecStartPre=/bin/sleep 10" /lib/systemd/system/fail2ban.service
}
configure()
{
[[ $ACTIVE_ != "yes" ]] && {
service fail2ban stop
update-rc.d fail2ban disable
echo "fail2ban disabled"
return
}
local NCLOG="/var/www/nextcloud/data/nextcloud.log"
local NCLOG1="$( sudo -u www-data php /var/www/nextcloud/occ config:system:get logfile )"
[[ "$NCLOG1" != "" ]] && NCLOG="$NCLOG1"
local BASEDIR=$( dirname "$NCLOG" )
[ -d "$BASEDIR" ] || { echo -e "directory $BASEDIR not found"; return 1; }
sudo -u www-data touch "$NCLOG" || { echo -e "ERROR: user www-data does not have write permissions on $NCLOG"; return 1; }
cd /var/www/nextcloud
sudo -u www-data php occ config:system:set loglevel --value=2
sudo -u www-data php occ config:system:set log_type --value=file
cat > /etc/fail2ban/filter.d/nextcloud.conf <<'EOF'
[INCLUDES]
before = common.conf
[Definition]
failregex = Login failed.*Remote IP.*'<HOST>'
ignoreregex =
EOF
[[ "$MAILALERTS_" == "yes" ]] && local ACTION=action_mwl || local ACTION=action_
cat > /etc/fail2ban/jail.conf <<EOF
# The DEFAULT allows a global definition of the options. They can be overridden
# in each jail afterwards.
[DEFAULT]
# "ignoreip" can be an IP address, a CIDR mask or a DNS host. Fail2ban will not
# ban a host which matches an address in this list. Several addresses can be
# defined using space separator.
ignoreip = 127.0.0.1/8
# "bantime" is the number of seconds that a host is banned.
bantime = $BANTIME_
# A host is banned if it has generated "maxretry" during the last "findtime"
# seconds.
findtime = $FINDTIME_
maxretry = $MAXRETRY_
#
# ACTIONS
#
banaction = iptables-multiport
protocol = tcp
chain = INPUT
action_ = %(banaction)s[name=%(__name__)s, port="%(port)s", protocol="%(protocol)s", chain="%(chain)s"]
action_mwl = %(banaction)s[name=%(__name__)s, port="%(port)s", protocol="%(protocol)s", chain="%(chain)s"]
sendmail-whois-lines[name=%(__name__)s, dest=$EMAIL_, sender=ncp-fail2ban@ownyourbits.com]
action = %($ACTION)s
#
# SSH
#
[ssh]
enabled = true
port = ssh
filter = sshd
logpath = /var/log/auth.log
maxretry = $MAXRETRY_
#
# HTTP servers
#
[nextcloud]
enabled = true
port = http,https
filter = nextcloud
logpath = $NCLOG
maxretry = $MAXRETRY_
EOF
cp /etc/fail2ban/jail.conf /etc/fail2ban/jail.local
update-rc.d fail2ban defaults
update-rc.d fail2ban enable
service fail2ban restart
echo "fail2ban enabled"
}
# License
#
# This script 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 2 of the License, or
# (at your option) any later version.
#
# This script 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 this script; if not, write to the
# Free Software Foundation, Inc., 59 Temple Place, Suite 330,
# Boston, MA 02111-1307 USA
|
