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Re: FC6 VPN



From: Donald Tripp <[email protected]>
Reply-To: For users of Fedora <[email protected]>
To: For users of Fedora <[email protected]>
Subject: Re: FC6 VPN
Date: Tue, 19 Dec 2006 12:33:16 -1000

What exactly do you need to connect to on the linux server? Anytime you make a connection between two computers you are using a tcp/ip port. SSH allows you to forward any local port to any remote port. If you need to connect to, say a windows share (samba in linux world), you would forward your local port to the linux server through the ssh tunnel. Sure, this isn't a true vpn, where you would time // remote_server, but its still friendly to use and secure.

- Donald Tripp
 [email protected]
----------------------------------------------
HPC Systems Administrator
High Performance Computing Center
University of Hawai'i at Hilo
200 W. Kawili Street
Hilo,   Hawaii   96720
http://www.hpc.uhh.hawaii.edu


On Dec 19, 2006, at 12:13 PM, Jim Douglas wrote:

From: James Wilkinson <[email protected]>
Reply-To: For users of Fedora <[email protected]>
To: [email protected]
Subject: Re: FC6 VPN
Date: Tue, 19 Dec:23:23 +0000

Jim Douglas wrote:

> VPN w/ SSH is overkill I think, all I need is to securely access a remote
> box...from Windows Client -> Linux Server.

Very often that will involve PuTTY. PuTTY also makes tunnelling very
easy, and is a *very* good terminal emulator.

> I think I found the answer,
> http://freenx.berlios.de/
>
> I have SSH up and running, anyone have any good links to securing my SSH
> configuration?

1. Stick to SSH 2 (in /etc/ssh/sshd_config, use the Protocol keyword)
2. Set up private keys and disable password-based logins
3. Changing the port that SSH listens on will not deter a determined
   attacker, but may help you work out that you've got a determined
   attacker.
4. Make sure you run yum update regularly.
5. Use AllowUsers or AllowGroups to limit which users can log on
   remotely. Don't allow direct root logins -- get users to login as
   themselves and su - (this means attackers have to work out which
   usernames are valid).
6. If you must use passwords, make sure they're not dictionary  words and
   include at least one (better, several) numbers or symbols.
7. Distribute the server public keys via trusted networks -- don't  trust
   the client's ability to "learn" the server's key when it first
   connects, since you don't know that the remote computer really  *is*
   your server.

But really, there's not much securing needed with SSH. It's only  really
vulnerable to a security bug at either end, a dictionary attack, a
man-in-the-middle attack during the first connection, or some new,
unknown mathematics.

Hope this helps,

James.

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I saw PuTTY, it won't do everything I need....thanks for the feedback,

One final question...

I can connect to port 22 inside the firewall and I don't want to create any holes. Can you see any problems with adding this to iptables?
iptables -I RH-Firewall-1-INPUT 3 -p tcp -m tcp --dport 22 --tcp- flags 
SYN,RST,ACK SYN -j ACCEPT
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I need to run Linux GUI apps with KDE, GNOME.

Jim

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