FrankChen021 commented on code in PR #19236:
URL: https://github.com/apache/druid/pull/19236#discussion_r3141492557


##########
multi-stage-query/src/main/java/org/apache/druid/msq/sql/MSQTaskQueryMaker.java:
##########
@@ -171,7 +172,13 @@ public QueryResponse<Object[]> runQuery(final DruidQuery 
druidQuery)
         taskContext
     );
 
-    FutureUtils.getUnchecked(overlordClient.runTask(taskId, controllerTask), 
true);
+    // Propagate auth context headers to Overlord for consumption
+    if (plannerContext.getAuthenticationResult() != null && 
plannerContext.getAuthenticationResult().getContext() != null) {
+      final Map<String, String> extraHeaders = 
CollectionUtils.mapValues(plannerContext.getAuthenticationResult().getContext(),
 String::valueOf);

Review Comment:
   [P2] Do not forward authenticator context as raw headers
   
   AuthenticationResult.getContext() is authenticator-defined metadata, not a 
map of HTTP headers. Forwarding every entry directly into the 
Broker-to-Overlord request can leak arbitrary auth context to the internal RPC 
path and can also break MSQ task submission when a provider stores 
non-header-safe keys or values. Please propagate only an explicit allowlisted 
header/token shape or use a typed inter-service auth-context carrier.



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