Re: nfs-kernel-server and firewalls

[Tom Allison]

Ernest Johanson wrote:
Been following this thread and understand that the goal is to configure a
firewall to control access to the ports used for NFS. If so, then suggest
the following:
#!/bin/sh
NFSPORTS=`rpcinfo -p | awk '/tcp/||/udp/ {print $4}' | sort | uniq`
for PORT_NUM in $NFSPORTS
do
      iptables -A INPUT -j <target> -s <srcip> -p <tcp|udp> --dport $PORT_NUM
      ...
done


# NFS
# First you open up the RPC port
iptables -A INPUT -i $IFACE -p udp -s $LAN --sport $LO_PORTS \
        -d $IF_ADDRESS --dport sunrpc -m state --state NEW \
        -j ACCEPT
iptables -A INPUT -i $IFACE -p tcp -s $LAN --sport $LO_PORTS \
        -d $IF_ADDRESS --dport sunrpc -m state --state NEW \
        -j ACCEPT
# Since rpc is so varied and large in it's ports I thought
# It easiest to just capture them all there and scroll throue
# the list.  One for TCP, one for UDP
TCP=`rpcinfo -p | grep "3   tcp" | awk '{print $4}' | sort | uniq`
for P in $TCP; do
        iptables -A INPUT -i $IFACE -p tcp -s $LAN --sport $LO_PORTS \
                -d $IF_ADDRESS --dport $P -m state --state NEW \
                -j ACCEPT
done
UDP=`rpcinfo -p | grep "3   udp" | awk '{print $4}' | sort | uniq`
for P in $UDP; do
        iptables -A INPUT -i $IFACE -p udp -s $LAN --sport $LO_PORTS \
                -d $IF_ADDRESS --dport $P -m state --state NEW \
                -j ACCEPT
done
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