Re: MD5 authentication needs help - Mailing list pgsql-hackers

From Tom Lane
Subject Re: MD5 authentication needs help
Date
Msg-id 24254.1425502449@sss.pgh.pa.us
Whole thread Raw
In response to Re: MD5 authentication needs help  (Bruce Momjian <bruce@momjian.us>)
Responses Re: MD5 authentication needs help
Re: MD5 authentication needs help
List pgsql-hackers
Bruce Momjian <bruce@momjian.us> 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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