Re: openssh public Key Athentication - with restrickted login shell

[Phillip Macey <phillip.macey () cisra canon com au>]

Jannis Kafkoulas wrote:
> Hi,
>
> I'd like too use scp to transfer data to a Linux box out of a perl script using public key authentication(with no 
> passphrase:-( ).
> As long as the used userid has a regular account on that server everything works fine.
> But for higher security I'd like the user not to be able to login, so I gave him a "nologin shell" in the /etc/paswd. In this case its also inposible 
> to authenticate as before.
> So I thought it should be a working but restricted "login shell", which is sufficient enough for that user complete the 
> authentication and to do its scp file transfer, nothing else.
> Any idea?
>   
Specify a command for that public key to run on connection. I use 
something like this on some of my machines to allow a particular key to 
only scp a particular file.
command="sh -c 'scp -t /home/username/filename'" ssh-dss 
ABCD....ufHlMaTj7= my openssh public key

You can find out exactly what command you need to use in authorized_keys 
by running 'scp -v' on the client side. One of the things it prints out 
is the name of the command that it is trying to run. I have not set the 
login shell for my username to nologin but I would presume that you 
should be able to do that and still have the scp working.

--
Thanks,
 Phill Macey (CiSRA IT Services)


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