Keith,

What you have is fine and will work, but here's something that will make it faster and more maintainable:

# Create an SSH Access Table
iptables -N SSHACS

Right before your "#Data center Local network" line, put:

# Handle SSH Traffic
iptables -A INPUT -p tcp --dport 22 -j SSHACS

Then for each IP you want to grant SSH Access to:
iptables -A SSHACS -s ip.ad.re.ss/mask -j ACCEPT

This is faster because it won't got through each rule for non-SSH traffic. Splitting similar rules like this can be a big help in complex rule sets.

HTH,

Richard Wilson
---------------------------------------------------------------
On 05/11/2011 07:24 PM, keith smith wrote:

Hi,

I'm rather new to IPTables. I've written a shell script to update and save the IPTables on a web server that only has HTTPD, SSL, Secured FTP, and SSH available.

I need to be able to access the server via SSH and SFTP and want to only allow the data center's local net and only those, by IP, that I allow to access the box over the Internet. Port 80 and 443 should be open to everyone.

I'm hoping someone or a couple of people can look at what I have written and give me some feedback. I've already locked myself out of one server so I would like to avoid that again.

Thanks in advance for your help!

- - - - - - -

#!/bin/bash
#
# iptables configuration for xxxxxxxxxxx
#------
# Flush all current rules from iptables
iptables -F

# Drop all forwarded packets
iptables -P FORWARD DROP

# Set access for localhost
iptables -A INPUT -i lo -j ACCEPT

# Port 80 for everyone
iptables -A INPUT -p tcp --dport 80 -j ACCEPT

# Port 443 for everyone
iptables -A INPUT -p tcp --dport 443 -j ACCEPT

# No SMTP/POP/MySql/Named ... ETC

# Accept packets belonging to established and related connections
iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT

#---------------------------------------------------------------------------------------------
# Allow SSH/FTP connections on tcp port 22 for only those we want to FTP or SSH into the box
#---------------------------------------------------------------------------------------------

#Data center Local network
iptables -A INPUT -p tcp -s 192.168.100.0/28 --dport 22 -j ACCEPT

#User 1
iptables -A INPUT -p tcp -s 999.999.999.999 --dport 22 -j ACCEPT

#user 2
iptables -A INPUT -p tcp -s 999.999.999.999 --dport 22 -j ACCEPT

#user 3
iptables -A INPUT -p tcp -s 999.999.999.999 --dport 22 -j ACCEPT

#---------------------------------------------------------------------------------
# - - - - Add additional consultants here and run script again - - - - -
#---------------------------------------------------------------------------------

# Data Center Staff from outside
iptables -A INPUT -p tcp -s 999.999.999.999 --dport 22 -j ACCEPT

#-----------------------------------------------------------------------------
# - - - - Add additional Data Center staff here and run script again - - - - -
#-----------------------------------------------------------------------------

# Allow all outbound traffic
iptables -P OUTPUT ACCEPT

# Drop everything else
iptables -P INPUT DROP

# Save settings
/sbin/service iptables save

# List rules
iptables -L -v

------------------------
Keith Smith
---------------------------------------------------
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