Investigate SidCount mismatch

[michael-o]

Consider the following exception:

2024-08-08T14:31:24.380 SCHWERWIEGEND [https-openssl-apr-8444-exec-6780] org.apache.catalina.core.StandardHostValve.invoke Exception Processing [/app]
    java.lang.IllegalArgumentException: SidCount is 0, but actual SidCount is 4
        at net.sf.michaelo.tomcat.pac.KerbValidationInfo.<init>(KerbValidationInfo.java:233)
        at net.sf.michaelo.tomcat.pac.Pac.<init>(Pac.java:147)
        at net.sf.michaelo.tomcat.realm.PacDataActiveDirectoryRealm.getPrincipal(PacDataActiveDirectoryRealm.java:157)
        at org.apache.catalina.realm.RealmBase.authenticate(RealmBase.java:495)
        at net.sf.michaelo.tomcat.authenticator.SpnegoAuthenticator.doAuthenticate(SpnegoAuthenticator.java:158)
        at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:563)

In theory, this can only happen when ExtraSids pointer is not null, but SidCount is zero. Does this make sense? Do we need to change: if (extraSidsPointer != 0L) to if (extraSidsPointer != 0L && sidCount != 0L)?

This makes only sense that the ExtraSids set is empty and the actual SidCount isn't set in the buffer, thus the next unit32 is stolen from ResourceGroupDomainSid.