sftp / scp extension

[guyverdh at mchsi.com]

We have a need to allow for encrypted file transfers around the 
internet, but do not wish to expose our systems completely.

What 
we would like to see is either an extension to the scp / sftp code to use an 
sftp_config or scp_config type file that places restrictions on 
directory movement, upload locations, download locations, 
etc...

Essentially run the sftp-server or scp code within a 
chrooted environment within the users directory could be 
sufficient, although allowing more movement / flexibility based on a 
config file would be preferable.

If at all possible something 
similiar to the ftpaccess file used with wu-ftpd.