I haven't looked at the code, but apparently, it checks if the rootCA is registered in the system.
This works if I have added the rootCA system-wide
(let ((cl-postgres:*ssl-certificate-file* "/some/path/to/cert.crt")
       (cl-postgres:*ssl-key-file* "/some/path/to/a-key.key"))
   (postmodern:with-connection
       '("dbname" "dbuser" "password" "some-remote-server.lan" :port 5432
         :use-ssl :full)
     (postmodern:query (:select '* :from 'table))))

On Tue, Mar 22, 2022 at 8:50 PM Sabra Crolleton <sabra.crolleton@gmail.com> wrote:

Postmodern uses cl+ssl and I do not see cl+ssl using a root ca. Maybe I am missing something in that library?

On Mon, Mar 21, 2022 at 9:37 PM Tim Hawes <trhawes@gmail.com> wrote:

Sorry Sabra, I didn't intend to reply to you directly.

---------- Forwarded message ---------
From: Tim Hawes <trhawes@gmail.com>
Date: Mon, Mar 21, 2022 at 9:35 PM
Subject: Re: How to connect cl+ssl with host ca verification?
To: Sabra Crolleton <sabra.crolleton@gmail.com>

That works, but it looks like the root ca has to be added to the system. If using psql I could specify where all the certs I want to use to connect with like so:

$>psql "port=5432 host=localhost user=postgres sslcert=./test/client.crt sslkey=./test/client.key sslrootcert=./test/server.crt sslmode=verify-full"
Is there an equivalent in Postmodern? 

On Mon, Mar 21, 2022 at 8:36 PM Sabra Crolleton <sabra.crolleton@gmail.com> wrote:

The cl-postgres (open-database ...) function has :use-ssl as a key parameter where the parameter values:

• :try means if the server supports it
• :require means use provided ssl certificate with no verification
• :yes means verify that the server cert is issued by a trusted CA, but does not verify the server hostname
• :full means expect a CA-signed cert for the supplied hostname and verify the server hostname

This is mirrored in the postmodern (connect ...) function.

If I understand your question correctly, you want to use :full as the parameter passed to :use-ssl. E.g.

(connect "test_db" "test-user" "test-password" "192.168.5.223"
         :port 5434 :pooled-p t :use-ssl :full)

But maybe I am not understanding your question correctly.

Sabra

On Mon, Mar 21, 2022 at 7:50 PM Tim Hawes <trhawes@gmail.com> wrote:

I am not finding any helpful information in how to connect to PostgreSQL using client key/client cert and a root ca for verifying the host with Postmodern. Can someone send me an example?