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Re: Who to run sshd as

from [Michael Ekstrand] Network Security [Permanent Link]
Subject: Re: Who to run sshd as
Date: Tue, 31 Oct 2006 10:32:15 -0600 
On Fri, 2006-10-27 at 23:44 -0400, James Stickland wrote:

Hello, im running openssh 4.4p1 for Linux

I setuid the sshd binary to execute as a normal user "joe"
but that user does not have permission to bind the socket.



How can i have my sshd run as non-root, yet still bind the socket?


Only root can bind to ports < 1024.  So if ssh is going to become
non-root, it must start as root and then drop its privileges after it
binds to the port.  Further, it needs the ability to setuid() to the
user who logs in.

If you're wanting to understand or control the user OpenSSH runs as,
look at its privilege separation capabilities.  Not sure if they're
available in non-OpenBSD OpenSSH, but they should be the tool for what
you're wanting.

- Michael
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