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initscripts/suricata: Rework creation of firewall rules.

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The script now will use the previously introduced seperate firewall chains called
IPS_INPUT, IPS_FORWARD and IPS_OUTPUT.

The commit also creates an AND connection between the choosen network zones in the UI and
the final firwall rules.

Fixes #12062.

Signed-off-by: Stefan Schantl <stefan.schantl@ipfire.org>
Signed-off-by: Arne Fitzenreiter <arne_f@ipfire.org>
This commit is contained in:
Stefan Schantl
2019-04-25 19:31:48 +02:00
committed by Arne Fitzenreiter
parent 5e3067cb52
commit 9cf253e150
1 changed files with 50 additions and 28 deletions
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78
src/initscripts/system/suricata
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@@ -6,7 +6,7 @@
#
# Author : Stefan Schantl <stefan.schantl@ipfire.org>
#
# Version : 01.00
# Version : 01.01
#
# Notes :
#
@@ -20,8 +20,10 @@ 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 "
@@ -29,6 +31,9 @@ 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="0x70000000"
MASK="0x70000000"
@@ -48,19 +53,18 @@ function get_cpu_count {
echo $CPUCOUNT
}
# Function to flush the firewall chain.
# Function to flush the firewall chains.
function flush_fw_chain {
# Call iptables and flush the chain
iptables -F "$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)
# Flush the firewall chain.
flush_fw_chain
# Loop through the array of network zones.
for zone in "${network_zones[@]}"; do
# Convert zone into upper case.
@@ -85,28 +89,46 @@ function generate_fw_rules {
network_device=${!zone_name}
fi
# 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
# 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 $NFQ_OPTIONS
# Add the network device to the array of enabled zones.
enabled_ips_zones+=( "$network_device" )
fi
done
# Clear repeat bit, so that it does not confuse IPsec or QoS
iptables -A "${FW_CHAIN}" -j MARK --set-xmark "0x0/${MASK}"
# 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