HADOOP-18388. Allow dynamic groupSearchFilter in LdapGroupsMapping. (#4798)

* HADOOP-18388. Allow dynamic groupSearchFilter in LdapGroupsMapping.

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/LdapGroupsMapping.java

@@ -30,6 +30,7 @@
 import java.security.GeneralSecurityException;
 import java.security.KeyStore;
 import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.Collections;
 import java.util.Hashtable;
 import java.util.Iterator;
@@ -252,6 +253,10 @@ public class LdapGroupsMapping
   public static final String POSIX_GID_ATTR_KEY = LDAP_CONFIG_PREFIX + ".posix.attr.gid.name";
   public static final String POSIX_GID_ATTR_DEFAULT = "gidNumber";
 
+  public static final String GROUP_SEARCH_FILTER_PATTERN =
+      LDAP_CONFIG_PREFIX + ".group.search.filter.pattern";
+  public static final String GROUP_SEARCH_FILTER_PATTERN_DEFAULT = "";
+
   /*
    * Posix attributes
    */
@@ -337,6 +342,7 @@ public class LdapGroupsMapping
   private int numAttempts;
   private volatile int numAttemptsBeforeFailover;
   private volatile String ldapCtxFactoryClassName;
+  private volatile String[] groupSearchFilterParams;
 
   /**
    * Returns list of groups for a user.
@@ -437,8 +443,14 @@ Set<String> lookupGroup(SearchResult result, DirContext c,
     Set<String> groupDNs = new HashSet<>();
 
     NamingEnumeration<SearchResult> groupResults;
-    // perform the second LDAP query
+
-    if (isPosix) {
+    String[] resolved = resolveCustomGroupFilterArgs(result);
+    // If custom group filter argument is supplied, use that!!!
+    if (resolved != null) {
+      groupResults =
+          c.search(groupbaseDN, groupSearchFilter, resolved, SEARCH_CONTROLS);
+    } else if (isPosix) {
+      // perform the second LDAP query
       groupResults = lookupPosixGroup(result, c);
     } else {
       String userDn = result.getNameInNamespace();
@@ -462,6 +474,25 @@ Set<String> lookupGroup(SearchResult result, DirContext c,
     return groups;
   }
 
+  private String[] resolveCustomGroupFilterArgs(SearchResult result)
+      throws NamingException {
+    if (groupSearchFilterParams != null) {
+      String[] filterElems = new String[groupSearchFilterParams.length];
+      for (int i = 0; i < groupSearchFilterParams.length; i++) {
+        // Specific handling for userDN.
+        if (groupSearchFilterParams[i].equalsIgnoreCase("userDN")) {
+          filterElems[i] = result.getNameInNamespace();
+        } else {
+          filterElems[i] =
+              result.getAttributes().get(groupSearchFilterParams[i]).get()
+                  .toString();
+        }
+      }
+      return filterElems;
+    }
+    return null;
+  }
+
   /**
    * Perform LDAP queries to get group names of a user.
    *
@@ -781,6 +812,12 @@ public synchronized void setConf(Configuration conf) {
         conf.get(POSIX_UID_ATTR_KEY, POSIX_UID_ATTR_DEFAULT);
     posixGidAttr =
         conf.get(POSIX_GID_ATTR_KEY, POSIX_GID_ATTR_DEFAULT);
+    String groupSearchFilterParamCSV = conf.get(GROUP_SEARCH_FILTER_PATTERN,
+        GROUP_SEARCH_FILTER_PATTERN_DEFAULT);
+    if(groupSearchFilterParamCSV!=null && !groupSearchFilterParamCSV.isEmpty()) {
+      LOG.debug("Using custom group search filters: {}", groupSearchFilterParamCSV);
+      groupSearchFilterParams = groupSearchFilterParamCSV.split(",");
+    }
 
     int dirSearchTimeout = conf.getInt(DIRECTORY_SEARCH_TIMEOUT,
         DIRECTORY_SEARCH_TIMEOUT_DEFAULT);
@@ -795,7 +832,16 @@ public synchronized void setConf(Configuration conf) {
       returningAttributes = new String[] {
           groupNameAttr, posixUidAttr, posixGidAttr};
     }
-    SEARCH_CONTROLS.setReturningAttributes(returningAttributes);
+
+    // If custom group filter is being used, fetch attributes in the filter
+    // as well.
+    ArrayList<String> customAttributes = new ArrayList<>();
+    if (groupSearchFilterParams != null) {
+      customAttributes.addAll(Arrays.asList(groupSearchFilterParams));
+    }
+    customAttributes.addAll(Arrays.asList(returningAttributes));
+    SEARCH_CONTROLS
+        .setReturningAttributes(customAttributes.toArray(new String[0]));
 
     // LDAP_CTX_FACTORY_CLASS_DEFAULT is not open to unnamed modules
     // in Java 11+, so the default value is set to null to avoid

hadoop-common-project/hadoop-common/src/main/resources/core-default.xml

@@ -585,6 +585,18 @@
   </description>
 </property>
 
+<property>
+  <name>hadoop.security.group.mapping.ldap.group.search.filter.pattern</name>
+  <value></value>
+  <description>
+    Comma separated values that needs to be substituted in the group search
+    filter during group lookup. The values are substituted in the order they
+    appear in the list, the first value will replace {0} the second {1} and
+    so on.
+  </description>
+</property>
+
+
 <property>
   <name>hadoop.security.group.mapping.providers</name>
   <value></value>

hadoop-common-project/hadoop-common/src/site/markdown/GroupsMapping.md

@@ -85,6 +85,14 @@ This is the limit for each ldap query.  If `hadoop.security.group.mapping.ldap.s
 `hadoop.security.group.mapping.ldap.base` configures how far to walk up the groups hierarchy when resolving groups.
 By default, with a limit of 0, in order to be considered a member of a group, the user must be an explicit member in LDAP.  Otherwise, it will traverse the group hierarchy `hadoop.security.group.mapping.ldap.search.group.hierarchy.levels` levels up.
 
+It is possible to have custom group search filters with different arguments using
+the configuration `hadoop.security.group.mapping.ldap.group.search.filter.pattern`, we can configure comma separated values here and the values configured will be fetched from the LDAP attributes and will be replaced in the group
+search filter in the order they appear here, say if the first entry here is uid, so uid will be fetched from the attributes and the value fetched
+will be used in place of {0} in the group search filter, similarly the second value configured will replace {1} and so on.
+
+Note: If `hadoop.security.group.mapping.ldap.group.search.filter.pattern` is configured, the group search will always be done assuming this group
+search filter pattern irrespective of any other parameters.
+
 ### Bind user(s) ###
 If the LDAP server does not support anonymous binds,
 set the distinguished name of the user to bind in `hadoop.security.group.mapping.ldap.bind.user`.

hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/security/TestLdapGroupsMapping.java

@@ -18,6 +18,7 @@
 package org.apache.hadoop.security;
 
 import static org.apache.hadoop.security.LdapGroupsMapping.CONNECTION_TIMEOUT;
+import static org.apache.hadoop.security.LdapGroupsMapping.GROUP_SEARCH_FILTER_PATTERN;
 import static org.apache.hadoop.security.LdapGroupsMapping.LDAP_NUM_ATTEMPTS_KEY;
 import static org.apache.hadoop.security.LdapGroupsMapping.READ_TIMEOUT;
 import static org.apache.hadoop.test.GenericTestUtils.assertExceptionContains;
@@ -27,6 +28,8 @@
 import static org.junit.Assert.fail;
 import static org.mockito.ArgumentMatchers.any;
 import static org.mockito.ArgumentMatchers.anyString;
+import static org.mockito.ArgumentMatchers.eq;
+import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.times;
 import static org.mockito.Mockito.verify;
 import static org.mockito.Mockito.when;
@@ -44,6 +47,8 @@
 
 import javax.naming.CommunicationException;
 import javax.naming.NamingException;
+import javax.naming.directory.Attribute;
+import javax.naming.directory.Attributes;
 import javax.naming.directory.SearchControls;
 
 import org.apache.hadoop.conf.Configuration;
@@ -120,6 +125,49 @@ public void testGetGroupsWithDefaultBaseDN() throws Exception {
     doTestGetGroupsWithBaseDN(conf, baseDN.trim(), baseDN.trim());
   }
 
+  @Test
+  public void testGetGroupsWithDynamicGroupFilter() throws Exception {
+    // Set basic mock stuff.
+    Configuration conf = getBaseConf(TEST_LDAP_URL);
+    String baseDN = "dc=xxx,dc=com";
+    conf.set(LdapGroupsMapping.BASE_DN_KEY, baseDN);
+    Attributes attributes = getAttributes();
+
+    // Set the groupFilter conf to take the csv.
+    conf.set(GROUP_SEARCH_FILTER_PATTERN, "userDN,userName");
+
+    // Set the value for userName attribute that is to be used as part of the
+    // group filter at argument 1.
+    final String userName = "some_user";
+    Attribute userNameAttr = mock(Attribute.class);
+    when(userNameAttr.get()).thenReturn(userName);
+    when(attributes.get(eq("userName"))).thenReturn(userNameAttr);
+
+    // Set the dynamic group search filter.
+    final String groupSearchFilter =
+        "(|(memberUid={0})(uname={1}))" + "(objectClass=group)";
+    conf.set(LdapGroupsMapping.GROUP_SEARCH_FILTER_KEY, groupSearchFilter);
+
+    final LdapGroupsMapping groupsMapping = getGroupsMapping();
+    groupsMapping.setConf(conf);
+
+    // The group search filter should be resolved and should be passed as the
+    // below.
+    String groupFilter = "(|(memberUid={0})(uname={1}))(objectClass=group)";
+    String[] resolvedFilterArgs =
+        new String[] {"CN=some_user,DC=test,DC=com", "some_user"};
+
+    // Return groups only if the resolved filter is passed.
+    when(getContext()
+        .search(anyString(), eq(groupFilter), eq(resolvedFilterArgs),
+            any(SearchControls.class)))
+        .thenReturn(getUserNames(), getGroupNames());
+
+    // Check the group filter got resolved and get the desired values.
+    List<String> groups = groupsMapping.getGroups(userName);
+    Assert.assertEquals(Arrays.asList(getTestGroups()), groups);
+  }
+
   /**
    * Helper method to do the LDAP getGroups operation using given user base DN
    * and group base DN.