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Re: Spoofing as the postmaster

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: "Mike Rylander" <mrylander(at)gmail(dot)com>
Cc: "Peter Eisentraut" <peter_e(at)gmx(dot)net>, pgsql-hackers(at)postgresql(dot)org, "Bruce Momjian" <bruce(at)momjian(dot)us>, "Tomasz Ostrowski" <tometzky(at)batory(dot)org(dot)pl>
Subject: Re: Spoofing as the postmaster
Date: 2007-12-22 19:08:36
Message-ID: 26022.1198350516@sss.pgh.pa.us (view raw or flat)
Thread:
Lists: pgsql-hackers
"Mike Rylander" <mrylander(at)gmail(dot)com> writes:
> On Dec 22, 2007 1:04 PM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
>> Hmm ... we've always thought of SSL as being primarily comm security
>> and thus useless on a Unix socket, but the mutual authentication aspect
>> could come in handy as an answer for this type of threat.  Anyone want
>> to try this and see if it really works or not?
>> 
>> Does OpenSSL have a mode where it only does mutual auth and not
>> encryption?

> miker(at)whirly:~$ openssl ciphers -v  'NULL'

Cool.  I took a quick look through the code, and I think that a smoke
test could be made just by diking out these lines in 
src/interfaces/libpq/fe-connect.c:

                if (IS_AF_UNIX(conn->raddr.addr.ss_family))
                {
                    /* Don't bother requesting SSL over a Unix socket */
                    conn->allow_ssl_try = false;
                }

Actual support would require rather more effort --- for instance,
I doubt that the default behavior should be to try to do SSL over a
socket, so "sslmode" would need some extension, and we'd want to extend
the pg_hba.conf keywords --- but I think this would be enough to allow
verifying whether it will work.

			regards, tom lane

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