Re: MD5 authentication needs help

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От
Tom Lane
Тема
Re: MD5 authentication needs help
Дата
Msg-id
24254.1425502449@sss.pgh.pa.us
Ответ на
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Дерево обсуждения
MD5 authentication needs help Bruce Momjian <bruce@momjian.us>
Re: MD5 authentication needs help Stephen Frost <sfrost@snowman.net>
Re: MD5 authentication needs help Stephen Frost <sfrost@snowman.net>
Re: MD5 authentication needs help Andres Freund <andres@2ndquadrant.com>
Re: MD5 authentication needs help Stephen Frost <sfrost@snowman.net>
Re: MD5 authentication needs help Andres Freund <andres@2ndquadrant.com>
Re: MD5 authentication needs help Stephen Frost <sfrost@snowman.net>
Re: MD5 authentication needs help Bruce Momjian <bruce@momjian.us>
Re: MD5 authentication needs help Stephen Frost <sfrost@snowman.net>
Re: MD5 authentication needs help Stephen Frost <sfrost@snowman.net>
Re: MD5 authentication needs help Bruce Momjian <bruce@momjian.us>
Re: MD5 authentication needs help Stephen Frost <sfrost@snowman.net>
Re: MD5 authentication needs help Bruce Momjian <bruce@momjian.us>
Re: MD5 authentication needs help Stephen Frost <sfrost@snowman.net>
Re: MD5 authentication needs help Bruce Momjian <bruce@momjian.us>
Re: MD5 authentication needs help Stephen Frost <sfrost@snowman.net>
Re: MD5 authentication needs help Bruce Momjian <bruce@momjian.us>
Re: MD5 authentication needs help Stephen Frost <sfrost@snowman.net>
Re: MD5 authentication needs help Bruce Momjian <bruce@momjian.us>
Re: MD5 authentication needs help Stephen Frost <sfrost@snowman.net>
Re: MD5 authentication needs help Jim Nasby <Jim.Nasby@BlueTreble.com>
Re: MD5 authentication needs help Stephen Frost <sfrost@snowman.net>
Re: MD5 authentication needs help Jim Nasby <Jim.Nasby@BlueTreble.com>
Re: MD5 authentication needs help Stephen Frost <sfrost@snowman.net>
Re: MD5 authentication needs help Greg Stark <stark@mit.edu>
Re: MD5 authentication needs help Stephen Frost <sfrost@snowman.net>
Re: MD5 authentication needs help Tom Lane <tgl@sss.pgh.pa.us>
Re: MD5 authentication needs help Stephen Frost <sfrost@snowman.net>
Re: MD5 authentication needs help Bruce Momjian <bruce@momjian.us>
Re: MD5 authentication needs help Tom Lane <tgl@sss.pgh.pa.us>
Re: MD5 authentication needs help Stephen Frost <sfrost@snowman.net>
Re: MD5 authentication needs help Bruce Momjian <bruce@momjian.us>
Re: MD5 authentication needs help Stephen Frost <sfrost@snowman.net>
Re: MD5 authentication needs help Albe Laurenz <laurenz.albe@wien.gv.at>
Re: MD5 authentication needs help Stephen Frost <sfrost@snowman.net>
Re: MD5 authentication needs help Bruce Momjian <bruce@momjian.us>
Re: MD5 authentication needs help Stephen Frost <sfrost@snowman.net>
Re: MD5 authentication needs help Stefan Kaltenbrunner <stefan@kaltenbrunner.cc>
Re: MD5 authentication needs help Robert Haas <robertmhaas@gmail.com>
Re: MD5 authentication needs help Stephen Frost <sfrost@snowman.net>
Re: MD5 authentication needs help Magnus Hagander <magnus@hagander.net>
Re: MD5 authentication needs help Stephen Frost <sfrost@snowman.net>
Re: MD5 authentication needs help Magnus Hagander <magnus@hagander.net>
Re: MD5 authentication needs help Stephen Frost <sfrost@snowman.net>
Re: MD5 authentication needs help Heikki Linnakangas <hlinnaka@iki.fi>
Re: MD5 authentication needs help Stephen Frost <sfrost@snowman.net>
Re: MD5 authentication needs help Heikki Linnakangas <hlinnaka@iki.fi>
Re: MD5 authentication needs help Stephen Frost <sfrost@snowman.net>
Bruce Momjian  writes:
> Let me update my list of possible improvements:

> 1)  MD5 makes users feel uneasy (though our usage is mostly safe)

> 2)  The per-session salt sent to the client is only 32-bits, meaning
> that it is possible to reply an observed MD5 hash in ~16k connection
> attempts.

> 3)  Using the user name for the MD5 storage salt allows the MD5 stored
> hash to be used on a different cluster if the user used the same
> password.

> 4)  Using the user name for the MD5 storage salt allows the MD5 stored
> hash to be used on the _same_ cluster.

> 5)  Using the user name for the MD5 storage salt causes the renaming of
> a user to break the stored password.

What happened to "possession of the contents of pg_authid is sufficient
to log in"?  I thought fixing that was one of the objectives here.
		regards, tom lane


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