Cheers, Dovecot 2.3.4.1 (Debian stable) here, and the changelog does not offer any hope of salvation, so a bug report it is.
The LDAP connections for userdb/passdb do not support SNI via TLS.
Simple construct to reproduce this:
0.) Have a.pem with SAN `foo.example.com`, b.pem with `bar.example.com`
1.) Configure haproxy frontend with `bind *:636 ssl crt /foo/a.pem ssl
crt /foo/b.pem`
2.) Try to use ldaps://bar.example.com/ in passdb, receive
"auth: Error: LDAP: Can't connect to server: ldaps://bar.example.com"
Expectation, of course, would be for this to work; most libraries
should support it, it's probably just a matter of convincing the
appropriate binding.
Kind regards,
-towo
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