# 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 $CPUCOUNT
+}
+
+# Function to create the firewall rules to pass the traffic to suricata.
+function generate_fw_rules {
+ cpu_count=$(get_cpu_count)
+
+ # Flush the firewall chain.
+ iptables -F "$FW_CHAIN"
+
+ # Loop through the array of network zones.
+ for zone in "${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=$NFQ_OPTS
+
+ # Check if there are multiple cpu cores available.
+ if [ "$cpu_count" -gt "1" ]; then
+ # Balance beetween all queues.
+ NFQ_OPTIONS+="--queue-balance 0:"
+ NFQ_OPTIONS+=$(($cpu_count-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 $NFQ_OPTIONS
+ fi
+ done
+}
+
+# Function to flush the firewall chain.
+function flush_fw_chain {
+ # Call iptables and flush the chain
+ iptables -F "$FW_CHAIN"
+}
+
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); 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 [ "$CPUCOUNT" -gt "1" ]; then
- # Balance beetween all queues.
- NFQ_OPTIONS+="--queue-balance 0:"
- NFQ_OPTIONS+=$(($CPUCOUNT-1))
- else
- # Send all packets to queue 0.
- NFQ_OPTIONS+="--queue-num 0"
- fi
-
- # Create firewall rules to queue the traffic and pass to
- # the IDS.
- iptables -I "$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
# 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
# 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
;;
*)