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Full Discussion: iptables ftp denies ls
Operating Systems Linux Red Hat iptables ftp denies ls Post 302571085 by shahdharmit on Sunday 6th of November 2011 03:17:37 AM
Old 11-06-2011
Network iptables ftp denies ls

Hi,

Following is the output of iptables -S command

Code:
-P INPUT ACCEPT
-P FORWARD ACCEPT
-P OUTPUT ACCEPT
-A INPUT -s 192.168.0.5/32 -p tcp -m tcp --dport 22 -j ACCEPT 
-A INPUT -s 192.168.0.5/32 -p udp -m udp --dport 22 -j ACCEPT 
-A INPUT -s 192.168.0.0/24 -p udp -m udp --dport 20 -j ACCEPT 
-A INPUT -s 192.168.0.0/24 -p udp -m udp --dport 21 -j ACCEPT 
-A INPUT -s 192.168.0.0/24 -p tcp -m tcp --dport 21 -j ACCEPT 
-A INPUT -s 192.168.0.0/24 -p tcp -m tcp --dport 20 -j ACCEPT 
-A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT 
-A INPUT -p icmp -j ACCEPT 
-A INPUT -i lo -j ACCEPT 
-A INPUT -j REJECT --reject-with icmp-host-prohibited 
-A FORWARD -j REJECT --reject-with icmp-host-prohibited

I don't understand iptables too much but what I want is that anonymous user can execute ls command on ftp prompt.

/etc/sysconfig/iptables-config file has the following line which I guess is required.

Code:
IPTABLES_MODULES="nf_conntrack_ftp nf_nat_ftp"

Still when I log into the ftp user using thourgh anonymous user, I can't do ls.

Following is what I get
Code:
ftp> ls
550 Permission denied.
Passive mode refused.

How can I resolve this issue?
 

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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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