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Allow access to SSH for certain IPs

Posted on 2012-04-04
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Last Modified: 2012-04-22
Hi,

what is the best way to deny access to ssh for every body except certain IPs. Looking for a way that's the easiest to configure, like editing a single file

Can I use iptables and put all IPs in a file? or hosts.allow? How do I deny access for every body?
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Question by:Dennie
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6 Comments
 
LVL 11

Expert Comment

by:legolasthehansy
ID: 37806614
On /etc/hosts.deny

sshd: ALL EXCEPT 192.168.0.2

The above denies all except 192.168.0.2. You don't need a restart as the settings are read once you save the file.
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Author Comment

by:Dennie
ID: 37806791
what if I want to add 5 more IPs?
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by:
legolasthehansy earned 668 total points
ID: 37806956
sshd: ALL EXCEPT 192.168.0.2, 192.168.0.3, 192.168.0.4 etc..

Or

sshd: ALL EXCEPT 192.168.0.1/255.255.255.0
to exclude the 192.168.0.1 network
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LVL 5

Assisted Solution

by:1ly4me
1ly4me earned 668 total points
ID: 37807229
For TCP wrappers,
/etc/hosts.deny
sshd : all except 192.168.0.0/24

This will only allow network 192.168.0.0 to access SSH

For IPtables.
#iptables -I INPUT -p tcp ! -s 192.168.0.0/24 --dport=22 -j REJECT
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LVL 3

Expert Comment

by:rickygm
ID: 37828164
Hi, I make by means of firewall or iptables

in shorewall like this

ACCEPT          net:XXX.XXX.XXX.XXX   $FW                   tcp     ssh

iptables other example

iptables -A INPUT -p tcp -s 192.168.0.0/24 --dport 22 -j ACCEPT

http://wiki.centos.org/HowTos/Network/IPTables

regardss
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LVL 4

Assisted Solution

by:senseifedon
senseifedon earned 664 total points
ID: 37846025
Hi;
iptables -I INPUT -p tcp --dport 22 -s 123.123.123.123 -j ACCEPT
iptables -I INPUT -p tcp --dport 22 -j DROP

Open in new window


123.123.123.123 should been your exception ip.

Good luck. Or you can use fail2ban. It's allow you to ban ip address after some (you can arrange value) unauthorized tries.
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