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Network Security Secure-Shell
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Re: How to verify Privilege Separation is working?

from [Greg Wooledge] Network Security [Permanent Link]
Subject: Re: How to verify Privilege Separation is working?
Date: Mon, 27 Sep 2004 07:53:53 -0400 
On Fri, Sep 24, 2004 at 08:59:53AM +0100, Philip Le Riche wrote:

Is there a simple way to positively demonstrate that privilege
separation is working? Running ps -fe shows all sshd processes running
as root.


The easiest way is to use an account that requires password
authentication, thus:

*before*
$ ps -ef | grep ssh
    root  1499     1  0  Sep 17  ?         0:57 /usr/local/sbin/sshd

*on a client box*
$ ssh server
wooledg@server's password: 

*on the server, while the password prompt is still up*
$ ps -ef | grep ssh
    root  1499     1  0  Sep 17  ?         0:57 /usr/local/sbin/sshd
    root 17011  1499  7 07:48:12 ?         0:00 sshd: wooledg [priv]
    sshd 17013 17011  4 07:48:12 ?         0:00 sshd: wooledg [net]

(In these examples, I omitted the lines for the current ssh shell session
to avoid confusion.)
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