Re: login: no shell: /bin/bash: Permission denied

[Andrew DeFaria <Andrew at DeFaria dot com>]

Corinna Vinschen wrote:

> On Wed, Mar 06, 2002 at 01:56:07PM -0800, Andrew DeFaria wrote:
> 
>>OK then, seems to me that su might be implementable by using a service 
>>that runs as SYSTEM and takes requests to switch user from user A to 
>>user B. Possible?
>>
> 
> Sure.  It's exactly the way the user switch is implemented in 2K/XP.


So then su can be implemented in Cygwin.


> 
>>Regardless, to me it's still would be a large security hole if all one 
>>needs to do is:
>>
>>$ echo "+" > ~/.rhosts
>>
>>to be able to abuse rsh to do something under somebody else's user ID is 
>>it not?
>>
> 
> It's the same on U*X.  If you don't care for the permissions of
> your home directory you're out of luck.


No it's not! As I've said repeatedly already a ~/.rhosts need not exist. Also, it does
not seem to matter if my home directory is locked down or not. If user A wishs to login
as user B and user A can create files in his own home directory (and even if he can't
since the presence of ~usera/.rhosts is not required) all user A needs to do is use
rsh with a -l userb parameter to execute commands as user B. This is not the same as
on Unix.


> And rsh is a dangerous service anyway.  If you don't want it,
> just remove the matching line in /etc/inetd.conf and use ssh.


Ah but I *want* rsh. I just want it to work correctly. :-)




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