Re: Support for NSS as a libpq TLS backend

On Mon, 2021-09-27 at 15:44 +0200, Daniel Gustafsson wrote:
> > Speaking of IP addresses in SANs, it doesn't look like our OpenSSL
> > backend can handle those. That's a separate conversation, but I might
> > take a look at a patch for next commitfest.
>
> Please do.

Didn't get around to it for November, but I'm putting the finishing
touches on that now.

While I was looking at the new SAN code (in fe-secure-nss.c,
pgtls_verify_peer_name_matches_certificate_guts()), I noticed that code
coverage never seemed to touch a good chunk of it:

> + for (cn = san_list; cn != san_list; cn = CERT_GetNextGeneralName(cn))
> + {
> + char *alt_name;
> + int rv;
> + char tmp[512];

That loop can never execute. But I wonder if all of that extra SAN code
should be removed anyway? There's this comment above it:

> + /*
> + * CERT_VerifyCertName will internally perform RFC 2818 SubjectAltName
> + * verification.
> + */

and it seems like SAN verification is working in my testing, despite
the dead loop.

--Jacob