#
# Author : Stefan Schantl <stefan.schantl@ipfire.org>
#
-# Version : 01.00
+# Version : 01.01
#
# Notes :
#
PATH=/usr/local/sbin:/usr/local/bin:/bin:/usr/bin:/sbin:/usr/sbin; export PATH
eval $(/usr/local/bin/readhash /var/ipfire/suricata/settings)
+eval $(/usr/local/bin/readhash /var/ipfire/ethernet/settings)
-# Name of the firewall chain.
-FW_CHAIN="IPS"
+# Name of the firewall chains.
+IPS_INPUT_CHAIN="IPS_INPUT"
+IPS_FORWARD_CHAIN="IPS_FORWARD"
+IPS_OUTPUT_CHAIN="IPS_OUTPUT"
# Optional options for the Netfilter queue.
NFQ_OPTS="--queue-bypass "
# Array containing the 4 possible network zones.
network_zones=( red green blue orange )
+# Array to store the network zones weather the IPS is enabled for.
+enabled_ips_zones=()
+
# Mark and Mask options.
-MARK="0x1"
-MASK="0x1"
+MARK="0x70000000"
+MASK="0x70000000"
# PID file of suricata.
PID_FILE="/var/run/suricata.pid"
+# Function to get the amount of CPU cores of the system.
+function get_cpu_count {
+ CPUCOUNT=0
+
+ # Loop through "/proc/cpuinfo" and count the amount of CPU cores.
+ while read line; do
+ [ "$line" ] && [ -z "${line%processor*}" ] && ((CPUCOUNT++))
+ done </proc/cpuinfo
+
+ echo $CPUCOUNT
+}
+
+# Function to flush the firewall chains.
+function flush_fw_chain {
+ # Call iptables and flush the chains
+ iptables -F "$IPS_INPUT_CHAIN"
+ iptables -F "$IPS_FORWARD_CHAIN"
+ iptables -F "$IPS_OUTPUT_CHAIN"
+}
+
+# Function to create the firewall rules to pass the traffic to suricata.
+function generate_fw_rules {
+ cpu_count=$(get_cpu_count)
+
+ # Loop through the array of network zones.
+ for zone in "${network_zones[@]}"; do
+ # Convert zone into upper case.
+ zone_upper=${zone^^}
+
+ # Generate variable name for checking if the IDS is
+ # enabled on the zone.
+ enable_ids_zone="ENABLE_IDS_$zone_upper"
+
+ # Check if the IDS is enabled for this network zone.
+ if [ "${!enable_ids_zone}" == "on" ]; then
+ # Check if the current processed zone is "red" and the configured type is PPPoE dialin.
+ if [ "$zone" == "red" ] && [ "$RED_TYPE" == "PPPOE" ]; then
+ # Set device name to ppp0.
+ network_device="ppp0"
+ else
+ # Generate variable name which contains the device name.
+ zone_name="$zone_upper"
+ zone_name+="_DEV"
+
+ # Grab device name.
+ network_device=${!zone_name}
+ fi
+
+ # Add the network device to the array of enabled zones.
+ enabled_ips_zones+=( "$network_device" )
+ fi
+ done
+
+ # Assign NFQ_OPTS
+ NFQ_OPTIONS=$NFQ_OPTS
+
+ # Check if there are multiple cpu cores available.
+ if [ "$cpu_count" -gt "1" ]; then
+ # Balance beetween all queues.
+ NFQ_OPTIONS+="--queue-balance 0:$(($cpu_count-1))"
+ NFQ_OPTIONS+=" --queue-cpu-fanout"
+ else
+ # Send all packets to queue 0.
+ NFQ_OPTIONS+="--queue-num 0"
+ fi
+
+ # Flush the firewall chains.
+ flush_fw_chain
+
+ # Check if the array of enabled_ips_zones contains any elements.
+ if [[ ${enabled_ips_zones[@]} ]]; then
+ # Loop through the array and create firewall rules.
+ for enabled_ips_zone in "${enabled_ips_zones[@]}"; do
+ # Create rules queue input and output related traffic and pass it to the IPS.
+ iptables -I "$IPS_INPUT_CHAIN" -i "$enabled_ips_zone" -m mark ! --mark "$MARK"/"$MASK" -j NFQUEUE $NFQ_OPTIONS
+ iptables -I "$IPS_OUTPUT_CHAIN" -o "$enabled_ips_zone" -m mark ! --mark "$MARK"/"$MASK" -j NFQUEUE $NFQ_OPTIONS
+
+ # Create rules which are required to handle forwarded traffic.
+ for enabled_ips_zone_forward in "${enabled_ips_zones[@]}"; do
+ iptables -I "$IPS_FORWARD_CHAIN" -i "$enabled_ips_zone" -o "$enabled_ips_zone_forward" -m mark ! --mark "$MARK"/"$MASK" -j NFQUEUE $NFQ_OPTIONS
+ done
+ done
+
+ # Clear repeat bit, so that it does not confuse IPsec or QoS
+ iptables -A "${IPS_INPUT_CHAIN}" -j MARK --set-xmark "0x0/${MASK}"
+ iptables -A "${IPS_FORWARD_CHAIN}" -j MARK --set-xmark "0x0/${MASK}"
+ iptables -A "${IPS_OUTPUT_CHAIN}" -j MARK --set-xmark "0x0/${MASK}"
+ fi
+}
+
case "$1" in
start)
# Get amount of CPU cores.
+ cpu_count=$(get_cpu_count)
+
+ # Numer of NFQUES.
NFQUEUES=
- CPUCOUNT=0
- while read line; do
- [ "$line" ] && [ -z "${line%processor*}" ] && NFQUEUES+="-q $CPUCOUNT " && ((CPUCOUNT++))
- done </proc/cpuinfo
+
+ for i in $(seq 0 $((cpu_count-1)) ); do
+ NFQUEUES+="-q $i "
+ done
# Check if the IDS should be started.
if [ "$ENABLE_IDS" == "on" ]; then
- # Loop through the array of network zones.
- for zone in "${network_zones[@]}"; do
- # Convert zone into upper case.
- zone_upper=${zone^^}
-
- # Generate variable name for checking if the IDS is
- # enabled on the zone.
- enable_ids_zone="ENABLE_IDS_$zone_upper"
-
- # Check if the IDS is enabled for this network zone.
- if [ "${!enable_ids_zone}" == "on" ]; then
- # Generate name of the network interface.
- network_device=$zone
- network_device+="0"
-
- # Assign NFQ_OPTS
- NFQ_OPTIONS=$NFQ_OPTS
-
- # Check if there are multiple cpu cores available.
- if [ "$CPUCOUNT" > 0 ]; then
- # Balance beetween all queues.
- NFQ_OPTIONS+="--queue-balance 0:"
- NFQ_OPTIONS+=$(($CPUCOUNT-1))
- else
- # Send all packets to queue 0.
- NFQ_OPTIONS+="--queue-num 0"
- fi
-
- # Create firewall rules to queue the traffic and pass to
- # the IDS.
- iptables -I "$FW_CHAIN" -i "$network_device" -m mark ! --mark "$MARK"/"$MASK" -j NFQUEUE $NFQ_OPTIONS
- iptables -I "$FW_CHAIN" -o "$network_device" -m mark ! --mark "$MARK"/"$MASK" -j NFQUEUE $NFQ_OPTIONS
- fi
- done
-
# Start the IDS.
boot_mesg "Starting Intrusion Detection System..."
- /usr/bin/suricata -c /etc/suricata/suricata.yaml -D $NFQUEUES
+ /usr/bin/suricata -c /etc/suricata/suricata.yaml -D $NFQUEUES >/dev/null 2>/dev/null
evaluate_retval
# Allow reading the pidfile.
chmod 644 $PID_FILE
+
+ # Flush the firewall chain
+ flush_fw_chain
+
+ # Generate firewall rules
+ generate_fw_rules
fi
;;
killproc -p $PID_FILE /var/run
# Flush firewall chain.
- iptables -F $FW_CHAIN
+ flush_fw_chain
# Remove suricata control socket.
rm /var/run/suricata/* >/dev/null 2>/dev/null
+ # Trash remain pid file if still exists.
+ rm -f $PID_FILE >/dev/null 2>/dev/null
+
# Don't report returncode of rm if suricata was not started
exit 0
;;
# Send SIGUSR2 to the suricata process to perform a reload
# of the ruleset.
kill -USR2 $(pidof suricata)
+
+ # Flush the firewall chain.
+ flush_fw_chain
+
+ # Generate firewall rules.
+ generate_fw_rules
;;
*)
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