The `tls cafile` setting in `smb.conf` is not necessary. It is used for
verifying peer certificates for mutual TLS authentication, not to
specify the intermediate certificate authority chain like I thought.
The setting cannot simply be left out, though. If it is not specified,
Samba will attempt to load a file from a built-in default path, which
will fail, causing the server to crash. This is avoided by setting the
value to the empty string.
Send logs to the systemd journal for easier viewing and disable logging
to a file. Also, the `samba_dc_log_level` variable can control the log
level (0-10, 0 being off, 10 being insane debugging).
I honestly don't remember why the `use rfc2307` setting was only enabled
on the first DC. All DCs seem to need this setting in order to use the
UID/GID numbers from the directory, instead of using auto-generated
numbers.
In order to enable LDAPS/STARTTLS support in Samba, the `tls enabled`
option must be set to `yes` and the `tls keyfile` and `tls certfile`
options must be set to the path of the private key and certificate
files, respectively, that Samba will use. The `samba_tls_enabled`,
`samba_tls_keyfile`, and `samb_tls_certfile` Ansible variables can be
used to control these values.
The *samba-dc* role now configures `winbindd` on domain controllers to
support identity mapping on the local machine. This will allow domain
users to log into the domain controller itself, e.g. via SSH.
The Fedora packaging of *samba4* still has some warts. Specifically, it
does not have a proper SELinux policy, so some work-arounds need to be
put into place in order for confined processes to communicate with
winbind.
Dustin