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Old 08-17-2009, 12:59 AM   #1
milad126
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stay safe in a Windows network


Hi,
I have a dual boot system, one is Ubuntu 8.4 and the other windows XP professional. My computer is a part of of a windows network and when I installed Ubuntu the internet/ network where detected automatically and I simply defined the network printers.

Am I safe on Ubuntu from the network administrator's access or they can still easily see the files on my hard drives files if they wish. If I am not currently safe, is there a way I can block others to access my computer through the network unless I have shared something?

Can I get alerted when somebody is trying to reach my computer on the network? any programs for that?

Thanks

PS. the network uses Windows server 2003
 
Old 08-17-2009, 01:40 AM   #2
markush
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Hello,

your computer can be detected since it is part of the TCP-IP-network.

Since your computer is (when running linux) not part of the active-directory-domain there maybe no need for anyone to access your computer (in the scope of network-administration).

This applies also to another windows-computer which is not member of the domain (Access is possible if one can authenticate on the computer). Otherwise, a domain-administrator can access any member of the domain without further authentication.

Be sure not to configure your linux-computer as a DHCP-server!!! The problem is, that this server would offer wrong ip-configurations to clients (such a DHCP-server is called a "rogue-server"). And this would be a reason for a domain-administrator to kick your linux-box out of the network.

Also be aware, that many windows-administrators use linux in the network for administration purposes and are familiar with linux.

Markus
 
Old 08-17-2009, 02:07 AM   #3
milad126
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Thanks...,

Quote:
Originally Posted by markush View Post
Be sure not to configure your linux-computer as a DHCP-server!!!
how could I make sure about that on Ubuntu?

you are right. My computer when running linux is not a part of the active domain and other users can not access me even if they know my Windows login password. Only if I define them as users on my linux box they can access me ( at least as far as I understand).

When windows users can not access my shared folders knowing my Windows password, can I assume that the administrator is not able to see my computer either?

Could I somehow get alerted when somebody is (with or without my permission) connected to my shared folders?
 
Old 08-17-2009, 02:12 AM   #4
neonsignal
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By default, none of your Ubuntu files will be accessible through the network (ie, not shared), assuming that only you know the login password(s) and you don't have other people log in to your computer.

Nor will there be many ports open (run 'nmap own_ip_address' from the command line to examine this). It is likely that other machines will be able to ping your ip address (and see a response), so the machine is not 'invisible' to the network. But this doesn't mean any files can be accessed.

The log file '/var/log/auth.log' will show the authorizations (and attempted authorizations on your system). However, if you are not running any services (eg sshd), then there will be no external authorizations.

You could run a firewall such as 'firestarter' if you wanted to actively block or monitor incoming access over the network.

Of course, anyone who has physical access to your machine will be able to access your files (unless they are encrypted). Also, when you are running Windows, anyone who can access your machine via Windows can also in theory access the files in your Ubuntu partition (with some effort).

Last edited by neonsignal; 08-17-2009 at 02:13 AM.
 
  


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