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Hi!

As a proof of concept I'm configuring the firewall (iptables) of my Lacie NAS and I think It could be interesting if you want to discuss my configuration.

I'm currently using the following services:

• http Server (the config page) (tcp/80)
• Samba server (137,138,139,445)
• NFS server (tcp/udp/111 , tcp/udp/2049)
• Mini DLNA Server (tcp/8200 udp/1900)
• Transmission (http is tcp/9091)
• NTP Server (udp/123)
• SSH server (tcp/22)

So here we have my proposed iptables configuration:

Code: Select all

#  Allows all loopback (lo0) traffic and drop all traffic to 127/8 that doesn't use lo0
-A INPUT -i lo -j ACCEPT
-A INPUT -i lo -d 127.0.0.0/8 -j REJECT

#  Accepts all established inbound connections
-A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT

#  Allows all outbound traffic
-A OUTPUT -j ACCEPT

#  Allows SSH connections
-A INPUT -p tcp -m state --state NEW --dport 22 -j ACCEPT

# Allows http connections
-A INPUT -p tcp -m state --state NEW --dport 80 -j ACCEPT

# Allow transmission
-A INPUT -p tcp -m state --state NEW --dport 9091 -j ACCEPT
 
# Allow Samba server to work (netbios)
-A INPUT -p udp --dport 137 -j ACCEPT
-A INPUT -p udp --dport 138 -j ACCEPT
-A INPUT -p udp --dport 139 -j ACCEPT
-A INPUT -p tcp --dport 139 -j ACCEPT
-A INPUT -p tcp --dport 445 -j ACCEPT

#Allow nfs to work
-A INPUT -p udp --dport 111 -j ACCEPT
-A INPUT -p tcp --dport 111 -j ACCEPT
-A INPUT -p udp --dport 2049 -j ACCEPT
-A INPUT -p tcp --dport 2049 -j ACCEPT

# nfs ports configured on /etc/sysconfig/nfs
-A INPUT -p tcp --dport 32803 -j ACCEPT
-A INPUT -p udp --dport 32769 -j ACCEPT
-A INPUT -p tcp --dport 892 -j ACCEPT
-A INPUT -p udp --dport 892 -j ACCEPT
-A INPUT -p tcp --dport 875 -j ACCEPT
-A INPUT -p udp --dport 875 -j ACCEPT
-A INPUT -p tcp --dport 662 -j ACCEPT
-A INPUT -p udp --dport 662 -j ACCEPT

#Allow minidlna to work
-A INPUT -p tcp --dport 8200 -j ACCEPT
-A INPUT -p udp --dport 1900 -j ACCEPT

# Allow ping
-A INPUT -p icmp -m icmp --icmp-type 8 -j ACCEPT
 
# log iptables denied calls
-A INPUT -m limit --limit 5/min -j LOG --log-prefix "iptables denied: " --log-level 7
 
# Reject all other inbound - default deny unless explicitly allowed policy
-A INPUT -j REJECT
-A FORWARD -j REJECT
 
COMMIT


on /etc/sysconfig/nfs I should write the following configuration:

Code: Select all

LOCKD_TCPPORT=32803
LOCKD_UDPPORT=32769
MOUNTD_PORT=892
RQUOTAD_PORT=875
STATD_PORT=662
STATD_OUTGOING_PORT=2020


I've not implemented this config though because I think it's unfinished.. For instance, I don't think transmission would work with these rules.

What do you think?

P.S: The idea of configuring iptables came after seeing how Lacie turned on in the middle of the night. I don't think NSA or Snowden are interested on my humble hard disk but maybe my TV or my IPTV or my shitty router is sending packets and awaking up my NAS.