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RE: Restricted Bash - Not so restrictive (in 4.2 as well)


From: Sarnath K - ERS, HCLTech
Subject: RE: Restricted Bash - Not so restrictive (in 4.2 as well)
Date: Thu, 12 Jan 2012 17:02:26 +0530

Thanks for the education!

I am planning a workaround. If I hit success, I will write again - hoping you 
guys won't mind...

-----Original Message-----
From: Pierre Gaston [mailto:address@hidden
Sent: Thursday, January 12, 2012 4:30 PM
To: Sarnath K - ERS, HCLTech
Cc: address@hidden; address@hidden
Subject: Re: Restricted Bash - Not so restrictive (in 4.2 as well)

On Thu, Jan 12, 2012 at 12:51 PM, Sarnath K - ERS, HCLTech
<address@hidden> wrote:
> Oops.. It actually works! That's a great catch!
>
> I thought "redirection" is not supported in restricted mode though..!
> I just checked... It is mostly related to "output" re-direction.
>
> Hmm......I think I am going to tinker "bash" source code to disable the 
> "echo" builtin. :-)
>
> Any ideas?
>
I don 't think it's a good idea, there are many many many tricks like
this ( printf, read, mapfile....), or for instance just run:
"$(<file)"
and you will get the file as an error message.

As hinted at the beginning securing a shell like you want should
probably be discussed elsewhere, maybe on a debian list.

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