I need to restrict ssh port (22)

I need to restrict ssh port (22) and mongod port (27017) to be accessible from my office network only, our office network range is 192.168.1.* and 192.168.2.*.

please help me with firewall settings to restict the access to above to ip range 192.168.1.* and 192.168.2.

Mevalal Yadav

<mevalal.yadav@gmail.com>



 # Firewall configuration written by system-config-firewall
# Manual customization of this file is not recommended.
*filter
:INPUT ACCEPT [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
-A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
-A INPUT -p icmp -j ACCEPT
-A INPUT -i lo -j ACCEPT
-A INPUT -s 192.168.1.0/255.255.255.0 -p tcp -m tcp --dport 22 -j ACCEPT
-A INPUT -s 192.168.2.0/255.255.255.0 -p tcp -m tcp --dport 22 -j ACCEPT
-A INPUT -s 192.168.1.0/255.255.255.0 -p tcp -m tcp --dport 27017 -j ACCEPT
-A INPUT -s 192.168.2.0/255.255.255.0 -p tcp -m tcp --dport 27017 -j ACCEPT
-A INPUT -p tcp -m tcp --dport 22 -j REJECT
-A INPUT -p tcp -m tcp --dport 27017 -j REJECT
-A INPUT -j REJECT --reject-with icmp-host-prohibited
-A FORWARD -j REJECT --reject-with icmp-host-prohibited
COMMIT

Devendra Joshi

<devendra.joshi9987@gmail.com>


 you can user TCP wrapper as well as iptables for this or both.

/etc/hosts.deny

sshd: ALL EXCEPT 192.168.1.0/24 192.168.2.0/24
mongod: ALL EXCEPT 192.168.1.0/24 192.168.2.0/24

iptables -A INPUT -s 192.168.1.0/24,192.168.2.0/24 -p tcp --dport 22 -m state --state NEW,ESTABLISHED -j ACCEPT
iptables -A OUTPUT -d 192.1681.0/24,192.168.2.0/24 -p tcp --sport 22 -m state ESTABLISHED -j ACCEPT

iptables -A INPUT -s 192.168.1.0/24,192.168.2.0/24 -p tcp --dport 27017 -m state --state NEW,ESTABLISHED -j ACCEPT
iptables -A OUTPUT -d 192.1681.0/24,192.168.2.0/24 -p tcp --sport 27017 -m state ESTABLISHED -j ACCEPT

Nilesh Chavan

<nileshdc8@gmail.com>

Thanks for your reply, I have below doubts :

1. do i need to run all the commands one after anothere

2. do i need to prefix iptables cmd before each line abov.

 

Mevalal Yadav

<mevalal.yadav@gmail.com>

 

 

Edit iptables files, then paste following 6 iptables rules which are mark bellow,

u have to put 6 rules before -A INPUT -j REJECT --reject-with icmp-host-prohibited  this rule

[root@server ~]# vi /etc/sysconfig/iptables


-A INPUT -s 192.168.1.0/255.255.255.0 -p tcp -m tcp --dport 22 -j ACCEPT
-A INPUT -s 192.168.2.0/255.255.255.0 -p tcp -m tcp --dport 22 -j ACCEPT
-A INPUT -s 192.168.1.0/255.255.255.0 -p tcp -m tcp --dport 27017 -j ACCEPT
-A INPUT -s 192.168.2.0/255.255.255.0 -p tcp -m tcp --dport 27017 -j ACCEPT
-A INPUT -p tcp -m tcp --dport 22 -j REJECT
-A INPUT -p tcp -m tcp --dport 27017 -j REJECT

[root@server ~]# /etc/init.d/iptables restart

Do this. & check

 

 

Devendra Joshi

<devendra.joshi9987@gmail.com>