03-26-2013
iptables Rules for my network
Hi Champs
i am new in Iptables and trying to write rules for my Samba server.I took some help from internet, created one script and run from rc.local :
#Allow loopback
iptables -I INPUT -i lo -j ACCEPT
# Accept packets from Trusted network
iptables -A INPUT -s my-network/subnet -j ACCEPT
# to allow established session to received traffic
iptables -A INPUT -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
# to allow SSH on port 22 from my network
iptables -A INPUT -i eth0 -p tcp -s my-network/subnet --dport 22 -m state --state NEW,ESTABLISHED -j ACCEPT
iptables -A OUTPUT -o eth0 -p tcp --sport 22 -m state --state ESTABLISHED -j ACCEPT
# To Allow incoming traffice on default SAMBA PORTS
iptables -A INPUT -p udp --dport 137 -j ACCEPT
iptables -A INPUT -p udp --dport 138 -j ACCEPT
iptables -A INPUT -p udp --dport 139 -j ACCEPT
iptables -A INPUT -p tcp --dport 139 -j ACCEPT
iptables -A INPUT -p tcp --dport 445 -j ACCEPT
#Enable Logging
iptables -A INPUT -j LOG
iptables -A INPUT -m limit --limit 2/min -j LOG --log-prefix "Iptables packet Drop" --log-level 7
# Drop all other Packets
iptables -A INPUT -j DROP
I also created one separate log file for iptables in /var/log/iptables.log and edit /etc/syslog.conf :
*.info;kern!=warning;mail.none;news.none;authpriv.none;cron.none /var/log/message
# Add new location
kern.warning /var/log/iptables.log
But my Drop packets are not showing in iptables.log file.Please let me know if i am doing wrong and let me know the correct way to write.I only want samba communication and SSH nothing else.
Thank You
Vaibhav
Last edited by Vaibhav.T; 03-26-2013 at 08:06 PM..
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LEARN ABOUT DEBIAN
iptables-xml
IPTABLES-XML(8) IPTABLES-XML(8)
NAME
iptables-xml -- Convert iptables-save format to XML
SYNOPSIS
iptables-xml [-c] [-v]
DESCRIPTION
iptables-xml is used to convert the output of iptables-save into an easily manipulatable XML format to STDOUT. Use I/O-redirection pro-
vided by your shell to write to a file.
-c, --combine
combine consecutive rules with the same matches but different targets. iptables does not currently support more than one target per
match, so this simulates that by collecting the targets from consecutive iptables rules into one action tag, but only when the rule
matches are identical. Terminating actions like RETURN, DROP, ACCEPT and QUEUE are not combined with subsequent targets.
-v, --verbose
Output xml comments containing the iptables line from which the XML is derived
iptables-xml does a mechanistic conversion to a very expressive xml format; the only semantic considerations are for -g and -j targets in
order to discriminate between <call> <goto> and <nane-of-target> as it helps xml processing scripts if they can tell the difference between
a target like SNAT and another chain.
Some sample output is:
<iptables-rules>
<table name="mangle">
<chain name="PREROUTING" policy="ACCEPT" packet-count="63436" byte-count="7137573">
<rule>
<conditions>
<match>
<p>tcp</p>
</match>
<tcp>
<sport>8443</sport>
</tcp>
</conditions>
<actions>
<call>
<check_ip/>
</call>
<ACCEPT/>
</actions>
</rule>
</chain>
</table> </iptables-rules>
Conversion from XML to iptables-save format may be done using the iptables.xslt script and xsltproc, or a custom program using libxsltproc
or similar; in this fashion:
xsltproc iptables.xslt my-iptables.xml | iptables-restore
BUGS
None known as of iptables-1.3.7 release
AUTHOR
Sam Liddicott <azez@ufomechanic.net>
SEE ALSO
iptables-save(8), iptables-restore(8), iptables(8)
Jul 16, 2007 IPTABLES-XML(8)