[Backport 2.x] When excluding fields also exclude the term + `.keywor…

…d` (opensearch-project#2377)

src/main/java/org/opensearch/security/configuration/DlsFlsFilterLeafReader.java

@@ -142,6 +142,7 @@ class DlsFlsFilterLeafReader extends SequentialStoredFieldsLeafReader  {
 
                 if (firstChar == '!' || firstChar == '~') {
                     excludesSet.add(incExc.substring(1));
+                    excludesSet.add(incExc.substring(1) + KEYWORD);
                 } else {
                     includesSet.add(incExc);
                 }

src/test/java/org/opensearch/security/dlic/dlsfls/FlsKeywordTests.java

@@ -0,0 +1,86 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * The OpenSearch Contributors require contributions made to
+ * this file be licensed under the Apache-2.0 license or a
+ * compatible open source license.
+ *
+ * Modifications Copyright OpenSearch Contributors. See
+ * GitHub history for details.
+ */
+
+package org.opensearch.security.dlic.dlsfls;
+
+import java.util.Arrays;
+
+import org.apache.http.Header;
+import org.apache.http.HttpStatus;
+import org.junit.Test;
+
+import org.opensearch.action.index.IndexRequest;
+import org.opensearch.action.support.WriteRequest.RefreshPolicy;
+import org.opensearch.client.Client;
+import org.opensearch.common.xcontent.XContentType;
+import org.opensearch.security.test.DynamicSecurityConfig;
+import org.opensearch.security.test.helper.rest.RestHelper.HttpResponse;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.core.IsEqual.equalTo;
+import static org.hamcrest.core.IsNot.not;
+import static org.hamcrest.core.StringContains.containsString;
+
+public class FlsKeywordTests extends AbstractDlsFlsTest {
+
+    protected void populateData(Client tc) {
+        tc.index(new IndexRequest("movies").id("0").setRefreshPolicy(RefreshPolicy.IMMEDIATE)
+            .source("{\"year\": 2013, \"title\": \"Rush\", \"actors\": [\"Daniel Br\u00FChl\", \"Chris Hemsworth\", \"Olivia Wilde\"]}", XContentType.JSON)).actionGet();
+    }
+
+    private Header movieUser = encodeBasicHeader("user_aaa", "password");
+    private Header movieNoActorUser = encodeBasicHeader("user_bbb", "password");
+
+    private String[] actors = new String[] {"Daniel Br\u00FChl", "Chris Hemsworth", "Olivia Wilde"};
+
+    @Test
+    public void testKeywordsAreAutomaticallyFiltered() throws Exception {
+        setup(new DynamicSecurityConfig()
+            .setSecurityRoles("roles_keyword.yml")
+            .setSecurityRolesMapping("roles_mappings_keyword.yml"));
+
+        final String searchQuery = "/movies/_search?filter_path=hits.hits._source";
+        final String aggQuery = "/movies/_search?filter_path=aggregations.actors.buckets.key";
+        final String aggByActorKeyword = "{\"aggs\":{\"actors\":{\"terms\":{\"field\":\"actors.keyword\",\"size\":10}}}}";
+
+        // At document level, the user should see actors
+        final HttpResponse searchMovieUser = rh.executeGetRequest(searchQuery, movieUser);
+        assertThat(searchMovieUser.getStatusCode(), equalTo(HttpStatus.SC_OK));
+        assertActorsPresent(searchMovieUser);
+
+        // In aggregate search, the user should see actors
+        final HttpResponse searchAggregateMovieUser = rh.executePostRequest(aggQuery, aggByActorKeyword, movieUser);
+        assertThat(searchAggregateMovieUser.getStatusCode(), equalTo(HttpStatus.SC_OK));
+        assertActorsPresent(searchAggregateMovieUser);
+
+        // At document level, the user should see no actors
+        final HttpResponse searchMovieNoActorUser = rh.executeGetRequest(searchQuery, movieNoActorUser);
+        assertThat(searchMovieNoActorUser.getStatusCode(), equalTo(HttpStatus.SC_OK));
+        assertActorsNotPresent(searchMovieNoActorUser);
+
+        // In aggregate search, the user should see no actors
+        final HttpResponse searchAggregateMovieNoActorUser = rh.executePostRequest(aggQuery, aggByActorKeyword, movieNoActorUser);
+        assertThat(searchAggregateMovieNoActorUser.getStatusCode(), equalTo(HttpStatus.SC_OK));
+        assertActorsNotPresent(searchAggregateMovieNoActorUser);
+    }
+
+    private void assertActorsPresent(final HttpResponse response) {
+        Arrays.stream(actors).forEach(actor -> {
+            assertThat(response.getBody(), containsString(actor));
+        });
+    }
+
+    private void assertActorsNotPresent(final HttpResponse response) {
+        Arrays.stream(actors).forEach(actor -> {
+            assertThat(response.getBody(), not(containsString(actor)));
+        });
+    }
+}

src/test/resources/dlsfls/roles_keyword.yml

@@ -0,0 +1,18 @@
+---
+_meta:
+  type: "roles"
+  config_version: 2
+movies:
+  index_permissions:
+  - index_patterns:
+    - "movies*"
+    allowed_actions:
+    - "read"
+movies_no_actors:
+  index_permissions:
+  - index_patterns:
+    - "movies*"
+    fls:
+    - "~actors"
+    allowed_actions:
+    - "read"

src/test/resources/dlsfls/roles_mappings_keyword.yml

@@ -0,0 +1,22 @@
+---
+_meta:
+  type: "rolesmapping"
+  config_version: 2
+movies:
+  reserved: false
+  hidden: false
+  backend_roles: []
+  hosts: []
+  users:
+  - "user_aaa"
+  and_backend_roles: []
+  description: "Movies with all fields"
+movies_no_actors:
+  reserved: false
+  hidden: false
+  backend_roles: []
+  hosts: []
+  users:
+  - "user_bbb"
+  and_backend_roles: []
+  description: "Movies without actors"