Section 8.5.1 of RFC 6121 - No such user

This cannot be enforced strictly for openfire IQ handlers to process packets for custom namespaces. I am modifying the original fix to exclude IQ handlers and also check for anonymous users.

src/java/org/jivesoftware/openfire/IQRouter.java

@@ -327,15 +327,6 @@ public class IQRouter extends BasicModule {
                 return;
             }
 
-            // RFC 6121 8.5.1.  No Such User http://xmpp.org/rfcs/rfc6121.html#rules-localpart-nosuchuser
-            // If the 'to' address specifies a bare JID <localpart@domainpart> or full JID <localpart@domainpart/resourcepart> where the domainpart of the JID matches a configured domain that is serviced by the server itself, the server MUST proceed as follows.
-            // If the user account identified by the 'to' attribute does not exist, how the stanza is processed depends on the stanza type.
-            if (recipientJID != null && recipientJID.getNode() != null && serverName.equals(recipientJID.getDomain()) && !userManager.isRegisteredUser(recipientJID.getNode()) && (IQ.Type.set == packet.getType() || IQ.Type.get == packet.getType())) {
-                // For an IQ stanza, the server MUST return a <service-unavailable/> stanza error to the sender.
-                sendErrorPacket(packet, PacketError.Condition.service_unavailable);
-                return;
-            }
-
            if (isLocalServer(recipientJID)) {
                 // Let the server handle the Packet
                 Element childElement = packet.getChildElement();
@@ -386,6 +377,16 @@ public class IQRouter extends BasicModule {
                 }
             }
             else {
+
+				// RFC 6121 8.5.1.  No Such User http://xmpp.org/rfcs/rfc6121.html#rules-localpart-nosuchuser
+				// If the 'to' address specifies a bare JID <localpart@domainpart> or full JID <localpart@domainpart/resourcepart> where the domainpart of the JID matches a configured domain that is serviced by the server itself, the server MUST proceed as follows.
+				// If the user account identified by the 'to' attribute does not exist, how the stanza is processed depends on the stanza type.
+				if (recipientJID != null && recipientJID.getNode() != null && serverName.equals(recipientJID.getDomain()) && !userManager.isRegisteredUser(recipientJID.getNode()) && sessionManager.getSession(recipientJID) == null && (IQ.Type.set == packet.getType() || IQ.Type.get == packet.getType())) {
+					// For an IQ stanza, the server MUST return a <service-unavailable/> stanza error to the sender.
+					sendErrorPacket(packet, PacketError.Condition.service_unavailable);
+					return;
+				}
+
                 ClientSession session = sessionManager.getSession(packet.getFrom());
                 boolean isAcceptable = true;
                 if (session instanceof LocalClientSession) {