[Freeipa-users] Certificate and key problems in Linux

[Rob Crittenden]

nathan at nathanpeters.com wrote:
> I have FreeIPA installed on several types of Linux machines and they are
> all experiencing strange issues with certificates and host keys.
> Here is the setup:
> 
> Server : FreeIPA 4.1.2 on Centos 7
> Client 1&2 : FreeIPA 3.0.0-42.el6 with sssd 1.11.6-30.el6_6.4 on CentOS 6.5
> Client 3&4 : FreeIPA 4.1.2-1.el7 on Centos 7
> 
> 
> First the FreeIPA clients running client 3.0.0 do not seem to be properly
> getting their host keys from the server.  Whenever I ssh from one client
> to another (or even to the IPA server itself) I am prompted to answer yes
> or no to the host key.  The host keys are both listed in the host record
> if I login to the domain controller web interface (and match what is on
> the server), and the DNS SSHFP records exist also.
> 
> # sss_ssh_authorizedkeys --debug 10 admin
> (Fri Mar 20 13:43:52:706986 2015) [sss_ssh_authorizedkeys] [main]
> (0x0020): sss_ssh_get_ent() failed (2): No such file or directory
> Error looking up public keys
> 
> I've seen some bug reports that this was a problem with sssd 1.10 but with
> a recent (updated today) version of sssd 1.11 I would assume that is not
> the issue?

I think you'll need to wait for one of the SSSD guys on this one. strace
might point the way if the error is happening on the user side of dbus.

> The second issue is that whenver I join a FreeIPA 4.1.2 client, I can't
> login with FreeIPA or AD users.  I believe this is due to the fact that
> when I login to the domain controller web interface and look at the
> freshly enrolled client it says "kerberos key present, host provisioned"
> but the next line is "Status No Valid Certificate".  Unenrolling and
> re-enrolling the client leads to the same issue with "No Valid
> Certificate".
> 
> Here is a grep of my client install log filtered for 'certificate'.  I
> don't see any errors.
> 2015-03-20T20:33:28Z DEBUG args='/usr/bin/certutil' '-d' '/tmp/tmpuZCwlm'
> '-A' '-n' 'CA certificate 1' '-t' 'C,,'
> 2015-03-20T20:33:28Z DEBUG auth_certificate_callback: check_sig=True
> is_server=False
> 2015-03-20T20:33:28Z DEBUG auth_certificate_callback: check_sig=True
> is_server=False
> 2015-03-20T20:33:30Z DEBUG Adding CA certificates to the IPA NSS database.
> 2015-03-20T20:33:32Z DEBUG Attempting to add CA certificates to the
> default NSS database.
> 2015-03-20T20:33:32Z INFO Added CA certificates to the default NSS database.
> 2015-03-20T20:33:32Z DEBUG auth_certificate_callback: check_sig=True
> is_server=False

The host certificate is not used for anything so it isn't the problem.
One is not obtained automatically in 4.1 any more. It wouldn't be used
at login in any case.

Did you disable the HBAC allow-all rule?

I'd bump up the sssd debug level and check the logs.

rob