First commit for Spacewalk Ansible roles

roles/iptables/templates/firewall.bash.j2

@@ -0,0 +1,79 @@
+#!/bin/bash
+# iptables firewall for common LAMP servers.
+#
+# This file should be located at /etc/firewall.bash, and is meant to work with
+# Jeff Geerling's firewall init script.
+#
+# Common port reference:
+#   22: SSH
+#   25: SMTP
+#   80: HTTP
+#   123: DNS
+#   443: HTTPS
+#   2222: SSH alternate
+#   4949: Munin
+#   6082: Varnish admin
+#   8080: HTTP alternate (often used with Tomcat)
+#   8983: Tomcat HTTP
+#   8443: Tomcat HTTPS
+#   9000: SonarQube
+#
+# @author Jeff Geerling
+
+# No spoofing.
+if [ -e /proc/sys/net/ipv4/conf/all/rp_filter ]
+then
+for filter in /proc/sys/net/ipv4/conf/*/rp_filter
+do
+echo 1 > $filter
+done
+fi
+
+# Remove all rules and chains.
+iptables -F
+iptables -X
+
+# Accept traffic from loopback interface (localhost).
+iptables -A INPUT -i lo -j ACCEPT
+
+# Forwarded ports.
+{# Add a rule for each forwarded port #}
+{% for forwarded_port in firewall_forwarded_tcp_ports %}
+iptables -t nat -I PREROUTING -p tcp --dport {{ forwarded_port.src }} -j REDIRECT --to-port {{ forwarded_port.dest }}
+{% endfor %}
+{% for forwarded_port in firewall_forwarded_udp_ports %}
+iptables -t nat -I PREROUTING -p udp --dport {{ forwarded_port.src }} -j REDIRECT --to-port {{ forwarded_port.dest }}
+{% endfor %}
+
+# Open ports.
+{# Add a rule for each open port #}
+{% for port in firewall_allowed_tcp_ports %}
+iptables -A INPUT -p tcp -m tcp --dport {{ port }} -j ACCEPT
+{% endfor %}
+{% for port in firewall_allowed_udp_ports %}
+iptables -A INPUT -p tcp -m udp --dport {{ port }} -j ACCEPT
+{% endfor %}
+
+# Accept icmp ping requests.
+iptables -A INPUT -p icmp -j ACCEPT
+
+# Allow NTP traffic for time synchronization.
+iptables -A OUTPUT -p udp --dport 123 -j ACCEPT
+iptables -A INPUT -p udp --sport 123 -j ACCEPT
+
+# Additional custom rules.
+{% for rule in firewall_additional_rules %}
+{{ rule }}
+{% endfor %}
+
+# Allow established connections:
+iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
+
+# Log EVERYTHING (ONLY for Debug).
+# iptables -A INPUT -j LOG
+
+# Log other incoming requests (all of which are dropped) at 15/minute max.
+iptables -A INPUT -m limit --limit 15/minute -j LOG --log-level 7 --log-prefix "Dropped by firewall: "
+
+# Drop all other traffic.
+iptables -A INPUT -j DROP

roles/iptables/templates/firewall.j2

@@ -0,0 +1,41 @@
+#! /bin/sh
+# /etc/init.d/firewall
+#
+# Firewall init script, to be used with /etc/firewall.bash by Jeff Geerling.
+#
+# @author Jeff Geerling
+
+### BEGIN INIT INFO
+# Provides:          firewall
+# Required-Start:    $remote_fs $syslog
+# Required-Stop:     $remote_fs $syslog
+# Default-Start:     2 3 4 5
+# Default-Stop:      0 1 6
+# Short-Description: Start firewall at boot time.
+# Description:       Enable the firewall.
+### END INIT INFO
+
+# Carry out specific functions when asked to by the system
+case "$1" in
+  start)
+    echo "Starting firewall."
+    /etc/firewall.bash
+    ;;
+  stop)
+    echo "Stopping firewall."
+    iptables -F
+    ;;
+  restart)
+    echo "Restarting firewall."
+    /etc/firewall.bash
+    ;;
+  status)
+    echo -e "`iptables -L -n`"
+    ;;
+  *)
+    echo "Usage: /etc/init.d/firewall {start|stop|status|restart}"
+    exit 1
+    ;;
+esac
+
+exit 0