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Full Discussion: iptables: block/allow ftp
Special Forums Cybersecurity iptables: block/allow ftp Post 17794 by sTorm on Wednesday 20th of March 2002 07:38:20 AM
Old 03-20-2002
For those who want to know, here is the iptables rule to block ftp connection requests from one side, and allow the request from the other:

# ftp control connection
iptables -A FORWARD -i eth1 -o eth0 -p TCP --sport 1024:65535 --dport ftp -j ACCEPT
iptables -A FORWARD -i eth0 -o eth1 -p TCP ! --syn --sport ftp --dport 1024:65535 -j ACCEPT

! --syn
Means, there's no connection request. Therefore, the packet can continue it's way through the firewall.

Just in case somebody wants to know.
 

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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)
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