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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