Issue #1765 has been updated by IanTurner.

Luke,

We tried changing a systems hostname and renaming all its certificate files 
accordingly, and it was able to retrieve the other host's configuration without 
any problem or server intervention. Perhaps this is a configuration issue? If 
you point me to the right directive I'll have a look.

>From my perspective, verifying that the certificate hostname is the same as 
>the facter hostname is functionally equivalent to just using the certificate 
>hostname, so if that's the approach then I think that's great. Our plan at the 
>moment is to have all information about a server's role in the organization be 
>derived from hostname alone, so if that can be verified it should be adequate.
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Bug #1765: Certificate hostnames are not verified
http://projects.reductivelabs.com/issues/show/1765

Author: IanTurner
Status: Needs design decision
Priority: Normal
Assigned to: 
Category: SSL
Target version: 
Complexity: Hard
Affected version: 0.24.6
Keywords: certificate security spoof validation authentication dns


The puppetmaster only verifies the validity of the client certificate, but does 
not verify the associated hostname. Thus a client with a certificate signed as 
"publicserver" can instead claim to be "secretserver" and gain access to the 
latter's configuration. This certificate hostname spoofing can be a serious 
issue, since client configuration may include password hashes and other 
confidential data.

The best approach to client validation is to verify that all three of the 
following are identical at the FQDN level:
1. The FQDN on the signed client certificate.
2. The FQDN presented by the client facter invocation.
3. The result of a reverse lookup on the connecting client IP address.

Additionally, an address (A/AAAA record, not CNAME record) lookup on this FQDN 
should in turn yield the connecting client IP address in the query result.


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