Issue #19514 has been updated by Erik Dalén.

This could probably be fixed by having Puppet::Node.merge_facts overwrite the 
certname fact with the real certname.

I for one don't consider overwriting spoofed certnames with real certnames to 
be breaking backwards compatibility.
----------------------------------------
Feature #19514: Provide in scope secured and validated data for use in manifests
https://projects.puppetlabs.com/issues/19514#change-84743

Author: Chris Spence
Status: Needs Decision
Priority: High
Assignee: eric sorenson
Category: node
Target version: 
Affected Puppet version: 
Keywords: facts clientcert node identity
Branch: 


Puppet lacks a secure identifier to identify a node in manifests.  Using facts 
($::clientcert, $::fqdn and $::hostname) is not reliable in that the data can 
be trivially spoofed.  There should therefore be top level scoped data that can 
be used in Hiera or conditionals that is guaranteed to match the CN of the cert 
presented which can then be safely be used to return apposite configurations to 
the node.  That data should be generated by the puppet master process itself, 
not importing facts.


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