Config files: custom_trusted_oid_mapping.yaml

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The custom_trusted_oid_mapping.yaml file lets you set your own short names for certificate extension object identifiers (OIDs), which can make the $trusted variable more useful.

It is only valid on a Puppet master server; in Puppet apply, the compiler doesn’t add certificate extensions to $trusted.

More about certificate extensions

When a node requests a certificate, it can ask the CA to include some additional, permanent metadata in that cert. (Puppet agent uses the csr_attributes.yaml file to decide what extensions to request.)

If the CA signs a certificate with extensions included, those extensions are available as trusted facts in the top-scope $trusted variable. Your manifests or node classifier can then use those trusted facts to decide which nodes can receive which configurations.

By default, the Puppet-specific registered OIDs appear as keys with convenient short names in the $trusted[extensions] hash, and any other OIDs appear as raw numerical IDs. You can use the custom_trusted_oid_mapping.yaml file to map other OIDs to short names, which will replace the numerical OIDs in $trusted[extensions].

For more info, see:

Limitations of OID mapping

Mapping OIDs in this file only affects the keys in the $trusted[extensions] hash. It does not affect:

  • What an agent can request in its csr_attributes.yaml file — anything but Puppet-specific registered extensions must still be numerical OIDs.
  • What you see when you run puppet cert print — mapped extensions will still be displayed as numerical OIDs. (Improving cert display is planned as PUP-4617.)


The OID mapping file is located at $confdir/custom_trusted_oid_mapping.yaml by default. Its location is configurable with the trusted_oid_mapping_file setting.

The location of the confdir depends on your OS. See the confdir documentation for details.


    shortname: 'myshortname'
    longname: 'My Long Name'
    shortname: 'myothershortname'
    longname: 'My Other Long Name'


The custom_trusted_oid_mapping.yaml must be a YAML hash containing a single key called oid_mapping.

The value of the oid_mapping key must be a hash whose keys are numerical OIDs. The value for each OID must be a hash with two keys:

  • shortname for the one-word name that will be used in the $trusted[extensions] hash.
  • longname for a more descriptive name (not currently used for anything).
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