sFTP nologin

[Jeff Wirth]

> Yes, been trying that all morning. sbin/nologin kills the connection after
> it prints the message.
> 
> i have been tring scponly it has been less that workable so far too.
> 

'nologin' will work for 'ftp' and things that don't require a password
( i.e. `sudo -u user -s`)

'scponly' is the correct solution for limiting users to scp or sftp. 
I use it extensively in production for setting up secure, automated
file transfers (w/ key auth).

Once 'scponly' is installed, it should be a simple matter of adding
'scponly' to /etc/shells and configuring your user's shell
accordingly.

- jw