Revert "Fix HTTP OPTIONS request auth handling (#5615)"

This reverts commit df51a7bcb7afc2b986ea2c9c42f111b161bcf1d4.
diff --git a/docs/content/configuration/auth.md b/docs/content/configuration/auth.md
index 6caf3aa..296d9ba 100644
--- a/docs/content/configuration/auth.md
+++ b/docs/content/configuration/auth.md
@@ -10,7 +10,6 @@
 |`druid.escalator.type`|String|Type of the Escalator that should be used for internal Druid communications. This Escalator must use an authentication scheme that is supported by an Authenticator in `druid.auth.authenticationChain`.|"noop"|no|
 |`druid.auth.authorizers`|JSON List of Strings|List of Authorizer type names |["allowAll"]|no|
 |`druid.auth.unsecuredPaths`| List of Strings|List of paths for which security checks will not be performed. All requests to these paths will be allowed.|[]|no|
-|`druid.auth.disableHttpOptionsAuthentication`|Boolean|If true, skip authentication checks for HTTP OPTIONS requests. Note that disabling authentication checks for OPTIONS requests will allow unauthenticated users to determine what Druid endpoints are valid, and this may leak sensitive information (for example, the `/druid/indexer/v1//task/{taskid}` endpoint on the Overlord and `/druid/coordinator/v1/datasources` endpoints on the Coordinator contain resource names), so the authentication checks should not be disabled unless truly necessary. |false|no|
 
 ## Enabling Authentication/Authorization
 
diff --git a/integration-tests/src/test/java/io/druid/tests/security/ITBasicAuthConfigurationTest.java b/integration-tests/src/test/java/io/druid/tests/security/ITBasicAuthConfigurationTest.java
index c175896..17c87ef 100644
--- a/integration-tests/src/test/java/io/druid/tests/security/ITBasicAuthConfigurationTest.java
+++ b/integration-tests/src/test/java/io/druid/tests/security/ITBasicAuthConfigurationTest.java
@@ -224,18 +224,6 @@
     
     LOG.info("Testing Avatica query on router with incorrect credentials.");
     testAvaticaAuthFailure(routerUrl);
-
-    LOG.info("Checking OPTIONS requests on services...");
-    testOptionsRequests(adminClient);
-  }
-
-  private void testOptionsRequests(HttpClient httpClient)
-  {
-    makeRequest(httpClient, HttpMethod.OPTIONS, config.getCoordinatorUrl() + "/status", null);
-    makeRequest(httpClient, HttpMethod.OPTIONS, config.getIndexerUrl() + "/status", null);
-    makeRequest(httpClient, HttpMethod.OPTIONS, config.getBrokerUrl() + "/status", null);
-    makeRequest(httpClient, HttpMethod.OPTIONS, config.getHistoricalUrl() + "/status", null);
-    makeRequest(httpClient, HttpMethod.OPTIONS, config.getRouterUrl() + "/status", null);
   }
 
   private void checkUnsecuredCoordinatorLoadQueuePath(HttpClient client)
diff --git a/server/src/main/java/io/druid/server/security/AllowOptionsResourceFilter.java b/server/src/main/java/io/druid/server/security/AllowOptionsResourceFilter.java
deleted file mode 100644
index d3960b3..0000000
--- a/server/src/main/java/io/druid/server/security/AllowOptionsResourceFilter.java
+++ /dev/null
@@ -1,77 +0,0 @@
-/*
- * Licensed to Metamarkets Group Inc. (Metamarkets) under one
- * or more contributor license agreements. See the NOTICE file
- * distributed with this work for additional information
- * regarding copyright ownership. Metamarkets licenses this file
- * to you under the Apache License, Version 2.0 (the
- * "License"); you may not use this file except in compliance
- * with the License. You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing,
- * software distributed under the License is distributed on an
- * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
- * KIND, either express or implied. See the License for the
- * specific language governing permissions and limitations
- * under the License.
- */
-
-package io.druid.server.security;
-
-import javax.servlet.Filter;
-import javax.servlet.FilterChain;
-import javax.servlet.FilterConfig;
-import javax.servlet.ServletException;
-import javax.servlet.ServletRequest;
-import javax.servlet.ServletResponse;
-import javax.servlet.http.HttpServletRequest;
-import javax.ws.rs.HttpMethod;
-import java.io.IOException;
-
-public class AllowOptionsResourceFilter implements Filter
-{
-  private final boolean disableAuthentication;
-
-  public AllowOptionsResourceFilter(
-      boolean disableAuthentication
-  )
-  {
-    this.disableAuthentication = disableAuthentication;
-  }
-
-  @Override
-  public void init(FilterConfig filterConfig) throws ServletException
-  {
-
-  }
-
-  @Override
-  public void doFilter(
-      ServletRequest request, ServletResponse response, FilterChain chain
-  ) throws IOException, ServletException
-  {
-    HttpServletRequest httpReq = (HttpServletRequest) request;
-
-    // Druid itself doesn't explictly handle OPTIONS requests, no resource handler will authorize such requests.
-    // so this filter catches all OPTIONS requests and authorizes them.
-    if (HttpMethod.OPTIONS.equals(httpReq.getMethod())) {
-      if (disableAuthentication) {
-        httpReq.setAttribute(
-            AuthConfig.DRUID_AUTHENTICATION_RESULT,
-            new AuthenticationResult(AuthConfig.ALLOW_ALL_NAME, AuthConfig.ALLOW_ALL_NAME, null)
-        );
-      }
-
-      httpReq.setAttribute(AuthConfig.DRUID_AUTHORIZATION_CHECKED, true);
-    }
-
-    chain.doFilter(request, response);
-  }
-
-  @Override
-  public void destroy()
-  {
-
-  }
-}
diff --git a/server/src/main/java/io/druid/server/security/AuthConfig.java b/server/src/main/java/io/druid/server/security/AuthConfig.java
index 1c9d16d..95f67c9 100644
--- a/server/src/main/java/io/druid/server/security/AuthConfig.java
+++ b/server/src/main/java/io/druid/server/security/AuthConfig.java
@@ -44,23 +44,19 @@
 
   public AuthConfig()
   {
-    this(null, null, null, null);
+    this(null, null, null);
   }
 
   @JsonCreator
   public AuthConfig(
       @JsonProperty("authenticatorChain") List<String> authenticationChain,
       @JsonProperty("authorizers") List<String> authorizers,
-      @JsonProperty("unsecuredPaths") List<String> unsecuredPaths,
-      @JsonProperty("disableHttpOptionsAuthentication") Boolean disableHttpOptionsAuthentication
+      @JsonProperty("unsecuredPaths") List<String> unsecuredPaths
   )
   {
     this.authenticatorChain = authenticationChain;
     this.authorizers = authorizers;
     this.unsecuredPaths = unsecuredPaths == null ? Collections.emptyList() : unsecuredPaths;
-    this.disableHttpOptionsAuthentication = disableHttpOptionsAuthentication == null
-                                            ? false
-                                            : disableHttpOptionsAuthentication;
   }
 
   @JsonProperty
@@ -72,9 +68,6 @@
   @JsonProperty
   private final List<String> unsecuredPaths;
 
-  @JsonProperty
-  private final boolean disableHttpOptionsAuthentication;
-
   public List<String> getAuthenticatorChain()
   {
     return authenticatorChain;
@@ -90,9 +83,14 @@
     return unsecuredPaths;
   }
 
-  public boolean isDisableHttpOptionsAuthentication()
+  @Override
+  public String toString()
   {
-    return disableHttpOptionsAuthentication;
+    return "AuthConfig{" +
+           "authenticatorChain='" + authenticatorChain + '\'' +
+           ", authorizers='" + authorizers + '\'' +
+           ", unsecuredPaths='" + unsecuredPaths + '\'' +
+           '}';
   }
 
   @Override
@@ -105,31 +103,14 @@
       return false;
     }
     AuthConfig that = (AuthConfig) o;
-    return isDisableHttpOptionsAuthentication() == that.isDisableHttpOptionsAuthentication() &&
-           Objects.equals(getAuthenticatorChain(), that.getAuthenticatorChain()) &&
-           Objects.equals(getAuthorizers(), that.getAuthorizers()) &&
-           Objects.equals(getUnsecuredPaths(), that.getUnsecuredPaths());
+    return Objects.equals(authenticatorChain, that.authenticatorChain) &&
+           Objects.equals(authorizers, that.authorizers) &&
+           Objects.equals(unsecuredPaths, that.unsecuredPaths);
   }
 
   @Override
   public int hashCode()
   {
-    return Objects.hash(
-        getAuthenticatorChain(),
-        getAuthorizers(),
-        getUnsecuredPaths(),
-        isDisableHttpOptionsAuthentication()
-    );
-  }
-
-  @Override
-  public String toString()
-  {
-    return "AuthConfig{" +
-           "authenticatorChain=" + authenticatorChain +
-           ", authorizers=" + authorizers +
-           ", unsecuredPaths=" + unsecuredPaths +
-           ", disableHttpOptionsAuthentication=" + disableHttpOptionsAuthentication +
-           '}';
+    return Objects.hash(authenticatorChain, authorizers, unsecuredPaths);
   }
 }
diff --git a/server/src/main/java/io/druid/server/security/AuthenticationUtils.java b/server/src/main/java/io/druid/server/security/AuthenticationUtils.java
index fa8de6a..cabaa82 100644
--- a/server/src/main/java/io/druid/server/security/AuthenticationUtils.java
+++ b/server/src/main/java/io/druid/server/security/AuthenticationUtils.java
@@ -27,16 +27,6 @@
 
 public class AuthenticationUtils
 {
-  public static void addAllowOptionsFilter(ServletContextHandler root, boolean disableHttpOptionsAuthentication)
-  {
-    FilterHolder holder = new FilterHolder(new AllowOptionsResourceFilter(disableHttpOptionsAuthentication));
-    root.addFilter(
-        holder,
-        "/*",
-        null
-    );
-  }
-
   public static void addAuthenticationFilterChain(
       ServletContextHandler root,
       List<Authenticator> authenticators
diff --git a/services/src/main/java/io/druid/cli/CliOverlord.java b/services/src/main/java/io/druid/cli/CliOverlord.java
index a40f5fc..33f842c 100644
--- a/services/src/main/java/io/druid/cli/CliOverlord.java
+++ b/services/src/main/java/io/druid/cli/CliOverlord.java
@@ -344,8 +344,6 @@
       AuthenticationUtils.addNoopAuthorizationFilters(root, UNSECURED_PATHS);
       AuthenticationUtils.addNoopAuthorizationFilters(root, authConfig.getUnsecuredPaths());
 
-      AuthenticationUtils.addAllowOptionsFilter(root, authConfig.isDisableHttpOptionsAuthentication());
-
       authenticators = authenticatorMapper.getAuthenticatorChain();
       AuthenticationUtils.addAuthenticationFilterChain(root, authenticators);
 
diff --git a/services/src/main/java/io/druid/cli/CoordinatorJettyServerInitializer.java b/services/src/main/java/io/druid/cli/CoordinatorJettyServerInitializer.java
index f165d3a..c9bc725 100644
--- a/services/src/main/java/io/druid/cli/CoordinatorJettyServerInitializer.java
+++ b/services/src/main/java/io/druid/cli/CoordinatorJettyServerInitializer.java
@@ -125,13 +125,12 @@
       AuthenticationUtils.addNoopAuthorizationFilters(root, CliOverlord.UNSECURED_PATHS);
     }
 
-    AuthenticationUtils.addAllowOptionsFilter(root, authConfig.isDisableHttpOptionsAuthentication());
-
     authenticators = authenticatorMapper.getAuthenticatorChain();
     AuthenticationUtils.addAuthenticationFilterChain(root, authenticators);
 
     JettyServerInitUtils.addExtensionFilters(root, injector);
 
+
     // Check that requests were authorized before sending responses
     AuthenticationUtils.addPreResponseAuthorizationCheckFilter(
         root,
diff --git a/services/src/main/java/io/druid/cli/MiddleManagerJettyServerInitializer.java b/services/src/main/java/io/druid/cli/MiddleManagerJettyServerInitializer.java
index 16c79a5..9408acc 100644
--- a/services/src/main/java/io/druid/cli/MiddleManagerJettyServerInitializer.java
+++ b/services/src/main/java/io/druid/cli/MiddleManagerJettyServerInitializer.java
@@ -78,11 +78,10 @@
     AuthenticationUtils.addNoopAuthorizationFilters(root, UNSECURED_PATHS);
     AuthenticationUtils.addNoopAuthorizationFilters(root, authConfig.getUnsecuredPaths());
 
-    AuthenticationUtils.addAllowOptionsFilter(root, authConfig.isDisableHttpOptionsAuthentication());
-
     authenticators = authenticatorMapper.getAuthenticatorChain();
     AuthenticationUtils.addAuthenticationFilterChain(root, authenticators);
 
+
     JettyServerInitUtils.addExtensionFilters(root, injector);
 
     // Check that requests were authorized before sending responses
diff --git a/services/src/main/java/io/druid/cli/QueryJettyServerInitializer.java b/services/src/main/java/io/druid/cli/QueryJettyServerInitializer.java
index dd97a91..b079041 100644
--- a/services/src/main/java/io/druid/cli/QueryJettyServerInitializer.java
+++ b/services/src/main/java/io/druid/cli/QueryJettyServerInitializer.java
@@ -102,8 +102,6 @@
     AuthenticationUtils.addNoopAuthorizationFilters(root, UNSECURED_PATHS);
     AuthenticationUtils.addNoopAuthorizationFilters(root, authConfig.getUnsecuredPaths());
 
-    AuthenticationUtils.addAllowOptionsFilter(root, authConfig.isDisableHttpOptionsAuthentication());
-
     authenticators = authenticatorMapper.getAuthenticatorChain();
     AuthenticationUtils.addAuthenticationFilterChain(root, authenticators);
 
diff --git a/services/src/main/java/io/druid/cli/RouterJettyServerInitializer.java b/services/src/main/java/io/druid/cli/RouterJettyServerInitializer.java
index c8c6a70..ec0ca47 100644
--- a/services/src/main/java/io/druid/cli/RouterJettyServerInitializer.java
+++ b/services/src/main/java/io/druid/cli/RouterJettyServerInitializer.java
@@ -111,8 +111,6 @@
     AuthenticationUtils.addNoopAuthorizationFilters(root, UNSECURED_PATHS);
     AuthenticationUtils.addNoopAuthorizationFilters(root, authConfig.getUnsecuredPaths());
 
-    AuthenticationUtils.addAllowOptionsFilter(root, authConfig.isDisableHttpOptionsAuthentication());
-
     final List<Authenticator> authenticators = authenticatorMapper.getAuthenticatorChain();
     AuthenticationUtils.addAuthenticationFilterChain(root, authenticators);