limitation of user a/c ( telnet service )

[Sam Varshavchik]

edwardspl at ita.org.mo writes:

> « HTML content follows »
> Les wrote:
>> On Tue, 2007-02-06 at 23:06 +0800, <URL:mailto:edwardspl at ita.org.mo>edwar 
>> dspl at ita.org.mo wrote:
>>   
>> 
>>> Dear All,
>>> 
>>> How can we limit a user a/c when telnet to the server :
>>> eg :
>>> 
>>> [edward at svr1 ~]$ ls -l -a
>>> total 36
>>> drwx------ 3 edward edward 4096 Feb  6 22:51 .
>>> drwxr-xr-x 5 root   root   4096 Feb  6 22:50 ..
>>> -rw------- 1 edward edward   14 Feb  6 22:52 .bash_history
>>> -rw-r--r-- 1 edward edward   24 Feb  6 22:50 .bash_logout
>>> -rw-r--r-- 1 edward edward  176 Feb  6 22:50 .bash_profile
>>> -rw-r--r-- 1 edward edward  124 Feb  6 22:50 .bashrc
>>> drwxr-xr-x 3 edward edward 4096 Feb  6 22:50 .kde
>>> -rw-r--r-- 1 edward edward  658 Feb  6 22:50 .zshrc
>>> [edward at svr1 ~]$
>>> 
>>> Prevent user "edward" from doing the following :
>>> modify / del the exiting files ( default by the system ).
>>> 
>>> Allow user "edward" create / del / modify other his own files / dirs.
>>> 
>>> Edward.
>>> -- 
>>>     
>> Have root create the files with root access, then put the world read and
>> execute privilege on them.  Only root can then modify them.
>> 
>> Regards,
>> Les H
>> 
>>   
> But when user "edward" login to the server by the telnet service, then he 
> can modify the dot file...

1) No, he can't.  Not if the file is owned by root, with no other 
permissions.

2) If you allow telnet access, you have more problems to worry about.  Such 
as anyone with access to your local network, or your Internet provider's 
network, being able to capture your login passwords.


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