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<H1>[Mageia-dev] SSH PAM configuration</H1>
<B>Pascal Terjan</B>
<A HREF="mailto:mageia-dev%40mageia.org?Subject=Re%3A%20%5BMageia-dev%5D%20SSH%20PAM%20configuration&In-Reply-To=%3CCA%2BCX%2BbjJatn1OUrrncZ%3DXSVPRTJqhNPDxt9qOHzK99UfqtqUbg%40mail.gmail.com%3E"
TITLE="[Mageia-dev] SSH PAM configuration">pterjan at gmail.com
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<I>Mon Aug 13 10:58:06 CEST 2012</I>
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<PRE>On Mon, Aug 13, 2012 at 9:39 AM, Anne Wilson <<A HREF="https://www.mageia.org/mailman/listinfo/mageia-dev">annew at kde.org</A>> wrote:
><i> -----BEGIN PGP SIGNED MESSAGE-----
</I>><i> Hash: SHA1
</I>><i>
</I>><i> On 13/08/12 08:34, Guillaume Rousse wrote:
</I>>><i> Le 12/08/2012 21:57, David Walser a écrit :
</I>>>><i> Johnny A. Solbu wrote:
</I>>>>><i> On Sunday 12 August 2012 19:28, David Walser wrote:
</I>>>>>><i> Through the PAM configuration for SSH shipped with the
</I>>>>>><i> openssh-server package, root login is broken. Here's why.
</I>>>>>><i> /etc/pam.d/sshd has: auth required pam_listfile.so item=user
</I>>>>>><i> sense=deny file=/etc/ssh/denyusers
</I>>>>>><i>
</I>>>>>><i> The file /etc/ssh/denyusers has "root" in it by default.
</I>>>>><i>
</I>>>>><i> I read somewhere some time ago that PermitRootLogin in
</I>>>>><i> sshd_config is ignored if PAM is used. That may be the reason
</I>>>>><i> for this.
</I>>>><i>
</I>>>><i> Nope, I just tested it and that is not true.
</I>>><i> There is an explicit comment in the configuration file: # Depending
</I>>><i> on your PAM configuration, # PAM authentication via
</I>>><i> ChallengeResponseAuthentication may bypass # the setting of
</I>>><i> "PermitRootLogin without-password".
</I>>><i>
</I>>><i> My understanding is just than some specific PAM configuration
</I>>><i> would eventually allow root user to authenticate through a
</I>>><i> password, instead of a key.
</I>>><i>
</I>>><i> Regarding your original problem, feel free to commit the relevant
</I>>><i> modifications.
</I>><i>
</I>><i> Why would anyone need root login over ssh? I don't allow it on my
</I>><i> server and it has never caused me any problems. Su to root works
</I>><i> perfectly well and avoids the security risk, so I don't understand
</I>><i> this thread.
</I>
Allowing login as root over ssh with a key can save things when for
some reason non local auth is down, like to fix the connection to the
ldap server (you can also create a local emergency account for that
usage).
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