Re: Support for NSS as a libpq TLS backend

Daniel Gustafsson <daniel@yesql.se>

From: Daniel Gustafsson <daniel@yesql.se>
To: Joshua Brindle <joshua.brindle@crunchydata.com>
Cc: Kevin Burke <kevin@burke.dev>, Jacob Champion <pchampion@vmware.com>, "pgsql-hackers@lists.postgresql.org" <pgsql-hackers@lists.postgresql.org>, "hlinnaka@iki.fi" <hlinnaka@iki.fi>, "andrew.dunstan@2ndquadrant.com" <andrew.dunstan@2ndquadrant.com>, "sfrost@snowman.net" <sfrost@snowman.net>, "rachelmheaton@gmail.com" <rachelmheaton@gmail.com>, "thomas.munro@gmail.com" <thomas.munro@gmail.com>, "michael@paquier.xyz" <michael@paquier.xyz>, "andres@anarazel.de" <andres@anarazel.de>
Date: 2021-11-23T14:12:45Z
Lists: pgsql-hackers

Attachments

> On 17 Nov 2021, at 19:42, Joshua Brindle <joshua.brindle@crunchydata.com> wrote:
> On Tue, Nov 16, 2021 at 1:26 PM Joshua Brindle
> <joshua.brindle@crunchydata.com> wrote:

>> I think there it a typo in the docs here that prevents them from
>> building (this diff seems to fix it):

Ah yes, thanks, I had noticed that one but forgot to send out a new version to
make the CFBot green.

> After a bit more testing, the server is up and running with an nss
> database but before configuring the client database I tried connecting
> and got a segfault:

Interesting.  I'm unable to reproduce this crash, can you show the sequence of
commands which led to this?

> It looks like the ssl connection falls through to attempt a non-ssl
> connection but at some point conn->ssl_in_use gets set to true,
> despite pr_fd and nss_context being null.

pgtls_close missed setting ssl_in_use to false, fixed in the attached.  I've
also added some assertions to the connection setup for debugging this.

> This patch fixes the segfault but I suspect is not the correct fix,
> due to the error when connecting saying "Success":

Right, without an SSL enabled FD we should never get here.

--
Daniel Gustafsson		https://vmware.com/

Commits

  1. Add tab-completion for CREATE FOREIGN TABLE.

  2. Add tap tests for the schema publications.

  3. Move Perl test modules to a better namespace

  4. Adjust configure to insist on Perl version >= 5.8.3.

  5. Simplify code related to compilation of SSL and OpenSSL

  6. Introduce --with-ssl={openssl} as a configure option

  7. Implement support for bulk inserts in postgres_fdw

  8. Fix redundant error messages in client tools

  9. doc: Apply more consistently <productname> markup for OpenSSL

  10. Check ssl_in_use flag when reporting statistics