HADOOP-9054. Add AuthenticationHandler that uses Kerberos but allows for an alternate form of authentication for browsers. (rkanter via tucu)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1418429 13f79535-47bb-0310-9956-ffa450edef68

hadoop-common-project/hadoop-auth/pom.xml

@@ -110,6 +110,7 @@
             <exclude>**/${test.exclude}.java</exclude>
             <exclude>${test.exclude.pattern}</exclude>
             <exclude>**/TestKerberosAuth*.java</exclude>
+            <exclude>**/TestAltKerberosAuth*.java</exclude>
             <exclude>**/Test*$*.java</exclude>
           </excludes>
         </configuration>

hadoop-common-project/hadoop-auth/src/main/java/org/apache/hadoop/security/authentication/server/AltKerberosAuthenticationHandler.java

@@ -0,0 +1,150 @@
+/**
+ * Licensed 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. See accompanying LICENSE file.
+ */
+package org.apache.hadoop.security.authentication.server;
+
+import java.io.IOException;
+import java.util.Properties;
+import javax.servlet.ServletException;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+import org.apache.hadoop.security.authentication.client.AuthenticationException;
+
+ /**
+ * The {@link AltKerberosAuthenticationHandler} behaves exactly the same way as
+ * the {@link KerberosAuthenticationHandler}, except that it allows for an
+ * alternative form of authentication for browsers while still using Kerberos
+ * for Java access.  This is an abstract class that should be subclassed
+ * to allow a developer to implement their own custom authentication for browser
+ * access.  The alternateAuthenticate method will be called whenever a request
+ * comes from a browser.
+ * <p/>
+ */
+public abstract class AltKerberosAuthenticationHandler
+                        extends KerberosAuthenticationHandler {
+
+  /**
+   * Constant that identifies the authentication mechanism.
+   */
+  public static final String TYPE = "alt-kerberos";
+
+  /**
+   * Constant for the configuration property that indicates which user agents
+   * are not considered browsers (comma separated)
+   */
+  public static final String NON_BROWSER_USER_AGENTS =
+          TYPE + ".non-browser.user-agents";
+  private static final String NON_BROWSER_USER_AGENTS_DEFAULT =
+          "java,curl,wget,perl";
+
+  private String[] nonBrowserUserAgents;
+
+  /**
+   * Returns the authentication type of the authentication handler,
+   * 'alt-kerberos'.
+   * <p/>
+   *
+   * @return the authentication type of the authentication handler,
+   * 'alt-kerberos'.
+   */
+  @Override
+  public String getType() {
+    return TYPE;
+  }
+
+  @Override
+  public void init(Properties config) throws ServletException {
+    super.init(config);
+
+    nonBrowserUserAgents = config.getProperty(
+            NON_BROWSER_USER_AGENTS, NON_BROWSER_USER_AGENTS_DEFAULT)
+            .split("\\W*,\\W*");
+    for (int i = 0; i < nonBrowserUserAgents.length; i++) {
+        nonBrowserUserAgents[i] = nonBrowserUserAgents[i].toLowerCase();
+    }
+  }
+
+  /**
+   * It enforces the the Kerberos SPNEGO authentication sequence returning an
+   * {@link AuthenticationToken} only after the Kerberos SPNEGO sequence has
+   * completed successfully (in the case of Java access) and only after the
+   * custom authentication implemented by the subclass in alternateAuthenticate
+   * has completed successfully (in the case of browser access).
+   * <p/>
+   *
+   * @param request the HTTP client request.
+   * @param response the HTTP client response.
+   *
+   * @return an authentication token if the request is authorized or null
+   *
+   * @throws IOException thrown if an IO error occurred
+   * @throws AuthenticationException thrown if an authentication error occurred
+   */
+  @Override
+  public AuthenticationToken authenticate(HttpServletRequest request,
+      HttpServletResponse response)
+      throws IOException, AuthenticationException {
+    AuthenticationToken token;
+    if (isBrowser(request.getHeader("User-Agent"))) {
+      token = alternateAuthenticate(request, response);
+    }
+    else {
+      token = super.authenticate(request, response);
+    }
+    return token;
+  }
+
+  /**
+   * This method parses the User-Agent String and returns whether or not it
+   * refers to a browser.  If its not a browser, then Kerberos authentication
+   * will be used; if it is a browser, alternateAuthenticate from the subclass
+   * will be used.
+   * <p/>
+   * A User-Agent String is considered to be a browser if it does not contain
+   * any of the values from alt-kerberos.non-browser.user-agents; the default
+   * behavior is to consider everything a browser unless it contains one of:
+   * "java", "curl", "wget", or "perl".  Subclasses can optionally override
+   * this method to use different behavior.
+   *
+   * @param userAgent The User-Agent String, or null if there isn't one
+   * @return true if the User-Agent String refers to a browser, false if not
+   */
+  protected boolean isBrowser(String userAgent) {
+    if (userAgent == null) {
+      return false;
+    }
+    userAgent = userAgent.toLowerCase();
+    boolean isBrowser = true;
+    for (String nonBrowserUserAgent : nonBrowserUserAgents) {
+        if (userAgent.contains(nonBrowserUserAgent)) {
+            isBrowser = false;
+            break;
+        }
+    }
+    return isBrowser;
+  }
+
+  /**
+   * Subclasses should implement this method to provide the custom
+   * authentication to be used for browsers.
+   *
+   * @param request the HTTP client request.
+   * @param response the HTTP client response.
+   * @return an authentication token if the request is authorized, or null
+   * @throws IOException thrown if an IO error occurs
+   * @throws AuthenticationException thrown if an authentication error occurs
+   */
+  public abstract AuthenticationToken alternateAuthenticate(
+      HttpServletRequest request, HttpServletResponse response)
+      throws IOException, AuthenticationException;
+}

hadoop-common-project/hadoop-auth/src/site/apt/Configuration.apt.vm

@@ -176,6 +176,73 @@ Configuration
 
     ...
 </web-app>
++---+
+
+** AltKerberos Configuration
+
+  <<IMPORTANT>>: A KDC must be configured and running.
+
+  The AltKerberos authentication mechanism is a partially implemented derivative
+  of the Kerberos SPNEGO authentication mechanism which allows a "mixed" form of
+  authentication where Kerberos SPNEGO is used by non-browsers while an
+  alternate form of authentication (to be implemented by the user) is used for
+  browsers.  To use AltKerberos as the authentication mechanism (besides
+  providing an implementation), the authentication filter must be configured
+  with the following init parameters, in addition to the previously mentioned
+  Kerberos SPNEGO ones:
+
+    * <<<[PREFIX.]type>>>: the full class name of the implementation of
+      AltKerberosAuthenticationHandler to use.
+
+    * <<<[PREFIX.]alt-kerberos.non-browser.user-agents>>>: a comma-separated
+      list of which user-agents should be considered non-browsers.
+
+  <<Example>>:
+
++---+
+<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee">
+    ...
+
+    <filter>
+        <filter-name>kerberosFilter</filter-name>
+        <filter-class>org.apache.hadoop.security.auth.server.AuthenticationFilter</filter-class>
+        <init-param>
+            <param-name>type</param-name>
+            <param-value>org.my.subclass.of.AltKerberosAuthenticationHandler</param-value>
+        </init-param>
+        <init-param>
+            <param-name>alt-kerberos.non-browser.user-agents</param-name>
+            <param-value>java,curl,wget,perl</param-value>
+        </init-param>
+        <init-param>
+            <param-name>token.validity</param-name>
+            <param-value>30</param-value>
+        </init-param>
+        <init-param>
+            <param-name>cookie.domain</param-name>
+            <param-value>.foo.com</param-value>
+        </init-param>
+        <init-param>
+            <param-name>cookie.path</param-name>
+            <param-value>/</param-value>
+        </init-param>
+        <init-param>
+            <param-name>kerberos.principal</param-name>
+            <param-value>HTTP/localhost@LOCALHOST</param-value>
+        </init-param>
+        <init-param>
+            <param-name>kerberos.keytab</param-name>
+            <param-value>/tmp/auth.keytab</param-value>
+        </init-param>
+    </filter>
+
+    <filter-mapping>
+        <filter-name>kerberosFilter</filter-name>
+        <url-pattern>/kerberos/*</url-pattern>
+    </filter-mapping>
+
+    ...
+</web-app>
 +---+
 
   \[ {{{./index.html}Go Back}} \]

hadoop-common-project/hadoop-auth/src/site/apt/index.apt.vm

@@ -24,6 +24,11 @@ Hadoop Auth, Java HTTP SPNEGO ${project.version}
   Hadoop Auth also supports additional authentication mechanisms on the client
   and the server side via 2 simple interfaces.
 
+  Additionally, it provides a partially implemented derivative of the Kerberos
+  SPNEGO authentication to allow a "mixed" form of authentication where Kerberos
+  SPNEGO is used by non-browsers while an alternate form of authentication
+  (to be implemented by the user) is used for browsers.
+
 * License
 
   Hadoop Auth is distributed under {{{http://www.apache.org/licenses/}Apache

hadoop-common-project/hadoop-auth/src/test/java/org/apache/hadoop/security/authentication/server/TestAltKerberosAuthenticationHandler.java

@@ -0,0 +1,110 @@
+/**
+ * Licensed 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. See accompanying LICENSE file.
+ */
+package org.apache.hadoop.security.authentication.server;
+
+import java.io.IOException;
+import java.util.Properties;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+import org.apache.hadoop.security.authentication.client.AuthenticationException;
+import org.mockito.Mockito;
+
+public class TestAltKerberosAuthenticationHandler
+    extends TestKerberosAuthenticationHandler {
+
+  @Override
+  protected KerberosAuthenticationHandler getNewAuthenticationHandler() {
+    // AltKerberosAuthenticationHandler is abstract; a subclass would normally
+    // perform some other authentication when alternateAuthenticate() is called.
+    // For the test, we'll just return an AuthenticationToken as the other
+    // authentication is left up to the developer of the subclass
+    return new AltKerberosAuthenticationHandler() {
+      @Override
+      public AuthenticationToken alternateAuthenticate(
+              HttpServletRequest request,
+              HttpServletResponse response)
+              throws IOException, AuthenticationException {
+        return new AuthenticationToken("A", "B", getType());
+      }
+    };
+  }
+
+  @Override
+  protected String getExpectedType() {
+    return AltKerberosAuthenticationHandler.TYPE;
+  }
+
+  public void testAlternateAuthenticationAsBrowser() throws Exception {
+    HttpServletRequest request = Mockito.mock(HttpServletRequest.class);
+    HttpServletResponse response = Mockito.mock(HttpServletResponse.class);
+
+    // By default, a User-Agent without "java", "curl", "wget", or "perl" in it
+    // is considered a browser
+    Mockito.when(request.getHeader("User-Agent")).thenReturn("Some Browser");
+
+    AuthenticationToken token = handler.authenticate(request, response);
+    assertEquals("A", token.getUserName());
+    assertEquals("B", token.getName());
+    assertEquals(getExpectedType(), token.getType());
+  }
+
+  public void testNonDefaultNonBrowserUserAgentAsBrowser() throws Exception {
+    HttpServletRequest request = Mockito.mock(HttpServletRequest.class);
+    HttpServletResponse response = Mockito.mock(HttpServletResponse.class);
+
+    if (handler != null) {
+      handler.destroy();
+      handler = null;
+    }
+    handler = getNewAuthenticationHandler();
+    Properties props = getDefaultProperties();
+    props.setProperty("alt-kerberos.non-browser.user-agents", "foo, bar");
+    try {
+      handler.init(props);
+    } catch (Exception ex) {
+      handler = null;
+      throw ex;
+    }
+
+    // Pretend we're something that will not match with "foo" (or "bar")
+    Mockito.when(request.getHeader("User-Agent")).thenReturn("blah");
+    // Should use alt authentication
+    AuthenticationToken token = handler.authenticate(request, response);
+    assertEquals("A", token.getUserName());
+    assertEquals("B", token.getName());
+    assertEquals(getExpectedType(), token.getType());
+  }
+
+  public void testNonDefaultNonBrowserUserAgentAsNonBrowser() throws Exception {
+    if (handler != null) {
+      handler.destroy();
+      handler = null;
+    }
+    handler = getNewAuthenticationHandler();
+    Properties props = getDefaultProperties();
+    props.setProperty("alt-kerberos.non-browser.user-agents", "foo, bar");
+    try {
+      handler.init(props);
+    } catch (Exception ex) {
+      handler = null;
+      throw ex;
+    }
+
+    // Run the kerberos tests again
+    testRequestWithoutAuthorization();
+    testRequestWithInvalidAuthorization();
+    testRequestWithAuthorization();
+    testRequestWithInvalidKerberosAuthorization();
+  }
+}

hadoop-common-project/hadoop-auth/src/test/java/org/apache/hadoop/security/authentication/server/TestKerberosAuthenticationHandler.java

@@ -28,23 +28,37 @@ import org.ietf.jgss.Oid;
 
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
-import java.lang.reflect.Field;
 import java.util.Properties;
 import java.util.concurrent.Callable;
 
 public class TestKerberosAuthenticationHandler extends TestCase {
 
-  private KerberosAuthenticationHandler handler;
+  protected KerberosAuthenticationHandler handler;
+
+  protected KerberosAuthenticationHandler getNewAuthenticationHandler() {
+    return new KerberosAuthenticationHandler();
+  }
+
+  protected String getExpectedType() {
+    return KerberosAuthenticationHandler.TYPE;
+  }
+
+  protected Properties getDefaultProperties() {
+    Properties props = new Properties();
+    props.setProperty(KerberosAuthenticationHandler.PRINCIPAL,
+            KerberosTestUtils.getServerPrincipal());
+    props.setProperty(KerberosAuthenticationHandler.KEYTAB,
+            KerberosTestUtils.getKeytabFile());
+    props.setProperty(KerberosAuthenticationHandler.NAME_RULES,
+            "RULE:[1:$1@$0](.*@" + KerberosTestUtils.getRealm()+")s/@.*//\n");
+    return props;
+  }
 
   @Override
   protected void setUp() throws Exception {
     super.setUp();
-    handler = new KerberosAuthenticationHandler();
-    Properties props = new Properties();
-    props.setProperty(KerberosAuthenticationHandler.PRINCIPAL, KerberosTestUtils.getServerPrincipal());
-    props.setProperty(KerberosAuthenticationHandler.KEYTAB, KerberosTestUtils.getKeytabFile());
-    props.setProperty(KerberosAuthenticationHandler.NAME_RULES,
-                      "RULE:[1:$1@$0](.*@" + KerberosTestUtils.getRealm()+")s/@.*//\n");
+    handler = getNewAuthenticationHandler();
+    Properties props = getDefaultProperties();
     try {
       handler.init(props);
     } catch (Exception ex) {
@@ -71,10 +85,8 @@ public class TestKerberosAuthenticationHandler extends TestCase {
 
     KerberosName.setRules("RULE:[1:$1@$0](.*@FOO)s/@.*//\nDEFAULT");
     
-    handler = new KerberosAuthenticationHandler();
-    Properties props = new Properties();
-    props.setProperty(KerberosAuthenticationHandler.PRINCIPAL, KerberosTestUtils.getServerPrincipal());
-    props.setProperty(KerberosAuthenticationHandler.KEYTAB, KerberosTestUtils.getKeytabFile());
+    handler = getNewAuthenticationHandler();
+    Properties props = getDefaultProperties();
     props.setProperty(KerberosAuthenticationHandler.NAME_RULES, "RULE:[1:$1@$0](.*@BAR)s/@.*//\nDEFAULT");
     try {
       handler.init(props);
@@ -97,8 +109,7 @@ public class TestKerberosAuthenticationHandler extends TestCase {
   }
 
   public void testType() throws Exception {
-    KerberosAuthenticationHandler handler = new KerberosAuthenticationHandler();
-    assertEquals(KerberosAuthenticationHandler.TYPE, handler.getType());
+    assertEquals(getExpectedType(), handler.getType());
   }
 
   public void testRequestWithoutAuthorization() throws Exception {
@@ -182,7 +193,7 @@ public class TestKerberosAuthenticationHandler extends TestCase {
 
       assertEquals(KerberosTestUtils.getClientPrincipal(), authToken.getName());
       assertTrue(KerberosTestUtils.getClientPrincipal().startsWith(authToken.getUserName()));
-      assertEquals(KerberosAuthenticationHandler.TYPE, authToken.getType());
+      assertEquals(getExpectedType(), authToken.getType());
     } else {
       Mockito.verify(response).setHeader(Mockito.eq(KerberosAuthenticator.WWW_AUTHENTICATE),
                                          Mockito.matches(KerberosAuthenticator.NEGOTIATE + " .*"));

hadoop-common-project/hadoop-common/CHANGES.txt

@@ -312,6 +312,8 @@ Release 2.0.3-alpha - Unreleased
     HADOOP-9090. Support on-demand publish of metrics. (Mostafa Elhemali via
     suresh)
 
+    HADOOP-9054. Add AuthenticationHandler that uses Kerberos but allows for 
+    an alternate form of authentication for browsers. (rkanter via tucu)
 
   IMPROVEMENTS