Dovecot with MySQL over SSL.

Reio Remma
Thu, 18 Jul 2019 21:24:38 -0000

Hello!

I'm attempting to get Dovecot working with MySQL user database on
another machine. I can connect to the MySQL (5.7.26) instance with SSL
enabled:

 ?mysql -h db.mrst.ee --ssl-ca=/etc/dovecot/ca.pem
--ssl-cert=/etc/dovecot/client-cert.pem
--ssl-key=/etc/dovecot/client-key.pem --ssl-cipher=DHE-RSA-AES256-SHA -u
vmail -p

However if I use the same values in dovecot-sql.conf.ext, I get the
following error:

Jul 19 00:20:18 turin dovecot: master: Dovecot v2.3.7 (494d20bdc)
starting up for imap, lmtp, sieve (core dumps disabled)
Jul 19 00:20:18 turin dovecot: auth-worker(82996): Error:
mysql(db.mrst.ee): Connect failed to database (vmail): SSL connection
error: protocol version mismatch - waiting for 1 seconds before retry
Jul 19 00:20:18 turin dovecot: auth-worker(82996): Error:
mysql(db.mrst.ee): Connect failed to database (vmail): SSL connection
error: protocol version mismatch - waiting for 1 seconds before retry
Jul 19 00:20:19 turin dovecot: auth-worker(82996): Error:
mysql(db.mrst.ee): Connect failed to database (vmail): Connections using
insecure transport are prohibited while --require_secure_transport=ON. -
waiting for 5 seconds before retry
Jul 19 00:20:19 turin dovecot: auth-worker(82996): Error:
mysql(db.mrst.ee): Connect failed to database (vmail): Connections using
insecure transport are prohibited while --require_secure_transport=ON. -
waiting for 5 seconds before retry

Database connection string:

connect = host=db.mrst.ee dbname=vmail user=vmail password=stuff \
 ??? ssl_ca=/etc/dovecot/ca.pem \
 ??? ssl_cert=/etc/dovecot/client-cert.pem \
 ??? ssl_key=/etc/dovecot/client-key.pem \
 ??? ssl_cipher=DHE-RSA-AES256-SHA

If I leave the ssl_cipher unset, I get:

Jul 19 00:23:41 turin dovecot: auth-worker(83069): Error:
mysql(db.mrst.ee): Connect failed to database (vmail): SSL connection
error: Failed to set ciphers to use - waiting for 1 seconds before retry

Any ideas?

Thanks!
Reio