How to enable IDTOKENS authentication in HTCondor 8.9.12, 9.0.0, and later

If would like to enable a simple method for authenticating daemon-to-daemon communication, IDTOKENS is relatively straightforward. Upon setting up IDTOKENS authentication, your HTCondor daemons will only trust other HTCondor daemons that are able to read a secret signing key that is stored on on each machine in a file that is readable only by the system. This will effectively prevent unauthorized machines from joining your pool, and also prevent users from starting their own HTCondor daemons on machines authorized with host-based (IP address) authentication.

(WINDOWS NOTE: In the config settings below, change FS to NTSSPI)

INSTRUCTIONS FOR ALL PLATFORMS: Add the following lines to enable the IDTOKENS method in the condor_config file: 

SEC_DAEMON_INTEGRITY = REQUIRED
SEC_DAEMON_AUTHENTICATION = REQUIRED
SEC_DAEMON_AUTHENTICATION_METHODS = IDTOKENS
SEC_NEGOTIATOR_INTEGRITY = REQUIRED
SEC_NEGOTIATOR_AUTHENTICATION = REQUIRED
SEC_NEGOTIATOR_AUTHENTICATION_METHODS = IDTOKENS
SEC_CLIENT_AUTHENTICATION_METHODS = FS, IDTOKENS
ALLOW_DAEMON = condor_pool@*

NOTE: If you have configured any other authentication methods, make sure to keep them in the list of CLIENT methods.

Then, on each machine in your pool, run this command as root: 

condor_store_cred -c add
And it will prompt you for a password (signing key). You can optionally use -p on the command line to avoid prompting. On Linux machines, can simply copy the file /etc/condor/passwords.d/POOL to all machines once have set it. If you do so, make sure to verify the permissions (0600) and ownership (root).

If your HTCondor daemons were already running when you made these changes, don't forget to reconfigure your pool to have the new settings take effect: 

condor_reconfig -all