BUG: _presence_ of valid openssl.cnf Option = 'ServerPreference' causes Dovecot submission relay FAIL: "failed: Failed to initialize SSL: ..."

25 Aug 2020

      I've
dovecot --version
	2.3.10.1 (a3d0e1171)
openssl version
	OpenSSL 1.1.1g FIPS  21 Apr 2020
, atm on Fedora32.
I configure
/etc/pki/tls/openssl.cnf
to set preferences for apps' usage, e.g. Postfix etc; Typically, here
cat /etc/pki/tls/openssl.cnf

	openssl_conf = default_conf

	[default_conf]
	ssl_conf = ssl_sect

	[ssl_sect]
	system_default = system_default_sect

	[system_default_sect]
	MinProtocol = TLSv1.2
	Ciphersuites = TLS_CHACHA20_POLY1305_SHA256:TLS_AES_256_GCM_SHA384:TLS_AES_128_GCM_SHA256
	CipherString = ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-SHA384:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES256-SHA384:ECDHE-RSA-AES128-SHA256
	Options = PrioritizeChaCha,ServerPreference
However, any/all sends from local client via Dovecot submission -- from an instance on the same server --  FAILS with that^^ openssl.cnf,
==> /var/log/dovecot/dovecot.log &lt;==
	...
	2020-08-24 17:04:42 submission(testuser@example.com)&lt;D4c5c6itUg2sHgsH>: Error: smtp-client: conn int.mx.example.net:465 (10.0.4.65:465) [1]: connect(int.mx.example.net:465) failed: Failed to initialize SSL: Couldn't initialize SSL context: Can't load SSL certificate: error:14187180:SSL routines:ssl_do_config:bad value: section=system_default, cmd=Options, arg=ServerPreference,PrioritizeChaCha
	2020-08-24 17:04:42 submission(testuser@example.com)&lt;D4c5c6itUg2sHgsH>: Error: Failed to establish relay connection: Failed to connect to remote server
	...
editing,

  Options = PrioritizeChaCha,ServerPreference

  Options = PrioritizeChaCha

cures the error
==> /var/log/dovecot/dovecot.log &lt;==
	...
	2020-08-24 17:08:04 submission(testuser@example.com)&lt;Uow+f6itZg2sHgsH>: Info: Successfully relayed message: from=&lt;testuser@example.com>, size=433, id=Mh4pJWRWRF9jHQAAVDn7pA, nrcpt=1, reply=`250 2.0.0 Ok: queued as 4Bb8TJ4VQbz7v6t'
	...
checking ssl docs
https://www.openssl.org/docs/man1.1.1/man3/SSL_CONF_cmd.html
BOTH are valid 'Options',
...
ServerPreference: use server and not client preference order when determining which cipher suite, signature algorithm or elliptic curve to use for an incoming connection. Equivalent to SSL_OP_CIPHER_SERVER_PREFERENCE. Only used by servers.

PrioritizeChaCha: prioritizes ChaCha ciphers when the client has a ChaCha20 cipher at the top of its preference list. This usually indicates a mobile client is in use. Equivalent to SSL_OP_PRIORITIZE_CHACHA. Only used by servers.
...
The mere presence of that option in a system-wide openssl.cnf shouldn't cause a Dovecot submission failure.

BUG: _presence_ of valid openssl.cnf Option = 'ServerPreference' causes Dovecot submission relay FAIL: "failed: Failed to initialize SSL: ..."

PGNet Dev