@Override
	public boolean anonymousCallbacksAllowed() {
		// PKI anonymous login handled internally
		// Valid PKI still required
		return false;
	}
<code>PKIAuthenticationModule</code> performs client authentication through the 
use of a dual-signed token.
Ghidra/Features/GhidraServer/src/main/java/ghidra/server/security/PKIAuthenticationModule.java