When 389 is used for start_tls, think of it as a unecrypted handshake sort of 
like this:
client: Yo bro sup, want to encrypt our connections?
server: Ya man, what can you do?
client: I support these ciphers
server: no shit, me too, lets do AES-Foo56
server: here is my cert
client: oh sweet I can read that and it matches my certificate authority
client: okay let's do this shit

So there is quite a bit more going on than just 636 (LDAPS). Straight 389 is 
clear text and should be avoided.

It's a bit more complicated that my explanation, but it gives an idea.

cheers


> On February 26, 2020 at 12:01 AM Jannis Mann <[email protected]> wrote:
> 
>     Hi,
> 
>     I am using sssd with out a domain join. 
>     So I am using a binding account which is working fine.
> 
>     I use our root CA to encrypt the communication to use ldaps over port 636.
> 
>     I found this FAQ  https://docs.pagure.org/SSSD.sssd/users/faq.html 
> (refering to the Authentication fails against LDAP section)
> 
>     Do I understand correctly that the communication is encrypted over TLS 
> when I dont use ldaps?When this is the case I would not need the root ca 
> certificate and can avoid the problem in running into an expiring certificate?
> 
>     Just for my understanding.. How is the TLS encryption to the DC possible 
> if I don't have a certificate? 
>     When I dont use ldaps is every communication encrypted or only the 
> transmission of the users password?
> 
>     What would speak for a ssl encryption over 636 if ldap over 389 is 
> encrypted aswell with out certificate?
> 
>     Thank you and have a nice day!
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