Re: [BUGS] BUG #14893: libpq SSL ClientHello too long, no option to set ciphers or affect cipher list length - Mailing list pgsql-bugs

From Tom Lane
Subject Re: [BUGS] BUG #14893: libpq SSL ClientHello too long, no option to set ciphers or affect cipher list length
Date
Msg-id 25136.1510245556@sss.pgh.pa.us
Whole thread Raw
In response to [BUGS] BUG #14893: libpq SSL ClientHello too long,no option to set ciphers or affect cipher list length  (minfrin@sharp.fm)
List pgsql-bugs
minfrin@sharp.fm writes:
> I am having trouble on an Ubuntu Xenial machine where the out-the-box psql
> refuses to connect to the out-the-box postgresql over SSL. The same setup
> worked on Ubuntu Trusty.

> Debugging reveals that the cipher list sent by the libpg client is too long
> (greater than 255 bytes), and this causes the postgresql server to slam down
> the phone, or it derails the client side enough that a bogus message "tlsv1
> alert unknown ca" is returned by the client.

This seems like an OpenSSL bug, not a Postgres bug.  libpq doesn't do
anything that determines cipher lists.
        regards, tom lane


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