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From: =?utf-8?Q?Dag-Erling_Sm=C3=B8rgrav?= <des@des.no>
To: Joe Malcolm <jmalcolm@uraeus.com>
Subject: Re: ntpd vulnerabilities
References: <252350272.1812596.1419241828431.JavaMail.zimbra@cleverbridge.com>
 <86a92fzmls.fsf@nine.des.no>
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Date: Tue, 23 Dec 2014 09:37:40 +0100
In-Reply-To: <21656.46224.764659.252388@neoshoggoth.uraeus.com> (Joe Malcolm's
 message of "Tue, 23 Dec 2014 00:17:20 +0000")
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Cc: freebsd-security@freebsd.org, Winfried Neessen <neessen@cleverbridge.com>,
 Robert Simmons <rsimmons0@gmail.com>
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Joe Malcolm <jmalcolm@uraeus.com> writes:
> I'm no expert on ntp.conf, but this appears in my ntp.conf on one of
> my FreeBSD systems:
>
> restrict default kod nomodify notrap nopeer noquery
> restrict -6 default kod nomodify notrap nopeer noquery
>
> However, it also has these:
>
> restrict 127.0.0.1
> restrict -6 ::1
> restrict 127.127.1.0

These work on a "last match" basis.  The latter three lines lift all
restrictions for localhost, so you can still "ntpq -pn" your own server,
but nobody else can.

DES
--=20
Dag-Erling Sm=C3=B8rgrav - des@des.no