[scponly] setup_chroot.sh and OpenBSD 3.3

[Robert Keyes]

Thanks for such a wonderful utility. This functionality should really be 
included in OpenSSH.

I am setting up an sftp / scp server with OpenBSD 3.3. The idea is that 
users don't even get to know each other exist. So they will be very 
chrooted.

Has anyone else modified the setup_root.sh script so that it is 
compatible with OpenBSD? Here's some of the things I have noted:

- openbsd has useradd, but it is not the same one as linux. The test for 
useradd fails for some reason. The syntax for the pw command seems to be 
the one that would fit, but changing the -d to -b.

I get the error that /home/dummy/incoming/sbin/chown doesn't exist. I 
notice that /home/dummy/incoming/sbin doesn't exist, so I create it and 
rerun setup_chroot.sh and get by this hurdle.

line 155 has useradd -n. I don't see an equivalent option in OpenBSD 
useradd. I think it would have to be done with a separate command.

After those changes I got through the script without a failure, but now 
I have /home/dummy/incoming/incoming -- huh I guess I am 
misunderstanding configuration question about the home directory.