On 09/03/2013 04:21 AM, Innes, Duncan wrote:
> Hi folks,
> I've got a question about kickstart enrollment with a one-time
> password.  Namely, is there any way that it can be done *without* the
> one-time password.  We're comfortable with the pre-creation of the
> host in IPA, but just wonder if there's a way to enrol without the
> one-time password. 
> The estate is Red Hat (mostly 6) and we deploy systems via kickstart
> from the Satellite.  Can the Satellite push out a certificate from the
> IPA system that would allow client to enrol without the OTP?  Our
> enrollment script runs as part of the kickstart postinstall with the
> OTP effectively sitting in plain text in the script.  Removing the OTP
> would remove the plain text authentication from this script, but I may
> be opening other security holes as a result.

There have been 3 ways about how the host can be enrolled:
a) High level admin using his credential (no need to have a pre-created
b) Lower level admin using his credential (requires a pre-created host)
c) OTP based (requires a pre-created host)

All provisioning methods that use static kickstart files would have to
have something injected into the kickstart. OTP is the safest and if
leaked can be used to only provision this specific system. The fact that
OTP was stolen can be detected easily by having a failed enrollment of
the valid system combined with IPA logs indicating that there was a
successful enrollment of the new host with the same name. The fact that
intruder was able to join a machine into IPA domain does not escalate
his privileges against other systems and since it can be easily caught
it is a risk but not a huge one.

The right approach of cause is not to have the OTP stored in kickstart
but rather parameterized in some way. In Satellite 6 (that we are
looking at) this will be done via Foreman and its smart proxies. The
design is not polished yet but we hope that we would be able to limit
the exposure of the OTPs there.

Also a new provisioning method has been added in FreeIPA 3.2 mostly for
re-provisioning - ability to provision if you already have a keytab.
This method will be sort of equivalent to what you are asking with a
cert. But instead of the cert you would need to get keytab first by
creating a host and then using ipa-getkeytab command and passing keytab
to the kickstart. That can be done now and would address the issue you
are concerned about.


> Cheers
> Duncan Innes
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Thank you,
Dmitri Pal

Sr. Engineering Manager for IdM portfolio
Red Hat Inc.

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