[patch] chroot support for openssh-3.5p1

[Nick Lange]

Good Morning All,
    Attached is a full patch [or so I hope] enabling chroot support for sshd. I know varied opinions about chroot exist 
among the masses; however, I continue to believe that until something far outside the scope of openssh tackles the 
sandbox issue, the role of enforcer will continue to be with the daemon.
This patch is based on a previous work by John Furman as well as Eric Johnson. I've been sitting on this for a month or 
two and have been running it sucessfully for about the same amount of time.

This patch assumes:
The ~username/chome directory exists with owner uid=root,gid=root [the directory name is configurable via sshd_config].
A proper jail has been setup underneath.

Unfortunately, syslogin_perform_logout is broken, as I'm not sure how to handle this [securely] as after the chroot, the 
file is no longer accessible.

This patch does work with privilege separation.

This patch requires a binary for scp/sftp-server to be in the proper locations in each jail as well.

You can chrootAll with exceptions or chroot none with a list of chroot'ed users.


If your're concerned with scp/sftp only rssh is still your solution. [http://www.pizzashack.org/rssh]

A web page with the patch is also available: http://majikal.dyn.dhs.org/projekts/openssh_chroot_patch/


Problems/Complaints/Suggestions/Additions can be sent to me at this address.
Cheers,
nick
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