[Freeipa-devel] Multiple CA certificates in LDAP, questions

[Jan Cholasta]

Hi,

I'm currently investigating support for multiple CA certificates in LDAP 
(<https://fedorahosted.org/freeipa/ticket/3259>, 
<https://fedorahosted.org/freeipa/ticket/3520>). This will be useful for 
CA certificate renewal (<https://fedorahosted.org/freeipa/ticket/3304>, 
<https://fedorahosted.org/freeipa/ticket/3737>) and using certificates 
issued by custom CAs for IPA HTTP and directory server instances 
(<https://fedorahosted.org/freeipa/ticket/3641>).

The biggest issue is how to make IPA clients aware of CA certificate 
changes. One of the tickets suggests polling the LDAP server from SSSD. 
Would that be sufficient? Perhaps a combination of polling and detecting 
certificate changes when connecting to LDAP would be better?

Another issue is how to handle updating IPA systems with new CA 
certificate(s). On clients it is probably sufficient to store the 
certificate(s) in /etc/ipa/ca.crt, but on servers there are multiple 
places where the update needs to be done (HTTP and directory server NSS 
databases, KDC pkinit_anchors file, etc.). IMO doing all this from SSSD 
is unrealistic, so there should be a way to do this externally. The 
simplest thing that comes to mind is that SSSD would execute an external 
script to do the update when it detects changes, but I'm not sure how 
well would that work with SELinux in the picture. Is there a better way 
to do this?

Suggestions and ideas are welcome.

Honza

-- 
Jan Cholasta