Add endpoint exception creation API validation

x-pack/plugins/lists/server/routes/create_exception_list_item_route.ts

@@ -16,6 +16,7 @@ import {
 } from '../../common/schemas';
 
 import { getExceptionListClient } from './utils/get_exception_list_client';
+import { endpointDisallowedFields } from './endpoint_disallowed_fields';
 
 export const createExceptionListItemRoute = (router: IRouter): void => {
   router.post(
@@ -70,6 +71,22 @@ export const createExceptionListItemRoute = (router: IRouter): void => {
               statusCode: 409,
             });
           } else {
+            if (exceptionList.type === 'endpoint') {
+              for (const entry of entries) {
+                if (entry.type === 'list') {
+                  return siemResponse.error({
+                    body: `cannot add exception item with entry of type "list" to endpoint exception list`,
+                    statusCode: 400,
+                  });
+                }
+                if (endpointDisallowedFields.includes(entry.field)) {
+                  return siemResponse.error({
+                    body: `cannot add endpoint exception item on field ${entry.field}`,
+                    statusCode: 400,
+                  });
+                }
+              }
+            }
             const createdList = await exceptionLists.createExceptionListItem({
               _tags,
               comments,

x-pack/plugins/lists/server/routes/endpoint_disallowed_fields.ts

@@ -0,0 +1,13 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License;
+ * you may not use this file except in compliance with the Elastic License.
+ */
+
+export const endpointDisallowedFields = [
+  'file.Ext.quarantine_path',
+  'file.Ext.quarantine_result',
+  'process.entity_id',
+  'process.parent.entity_id',
+  'process.ancestry',
+];

x-pack/test/api_integration/apis/index.js

@@ -31,5 +31,6 @@ export default function ({ loadTestFile }) {
     loadTestFile(require.resolve('./transform'));
     loadTestFile(require.resolve('./endpoint'));
     loadTestFile(require.resolve('./ingest_manager'));
+    loadTestFile(require.resolve('./lists'));
   });
 }

x-pack/test/api_integration/apis/lists/create_exception_list_item.ts

@@ -0,0 +1,72 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License;
+ * you may not use this file except in compliance with the Elastic License.
+ */
+
+import expect from '@kbn/expect/expect.js';
+import { FtrProviderContext } from '../../ftr_provider_context';
+
+export default function ({ getService }: FtrProviderContext) {
+  const esArchiver = getService('esArchiver');
+  const supertest = getService('supertest');
+  describe('Lists API', () => {
+    before(async () => await esArchiver.load('lists'));
+
+    after(async () => await esArchiver.unload('lists'));
+
+    it('should return a 400 if an endpoint exception item with a list-based entry is provided', async () => {
+      const badItem = {
+        namespace_type: 'agnostic',
+        description: 'bad endpoint item for testing',
+        name: 'bad endpoint item',
+        list_id: 'endpoint_list',
+        type: 'simple',
+        entries: [
+          {
+            type: 'list',
+            field: 'some.field',
+            operator: 'included',
+            list: {
+              id: 'somelist',
+              type: 'keyword',
+            },
+          },
+        ],
+      };
+      const { body } = await supertest
+        .post(`/api/exception_lists/items`)
+        .set('kbn-xsrf', 'xxx')
+        .send(badItem)
+        .expect(400);
+      expect(body.message).to.eql(
+        'cannot add exception item with entry of type "list" to endpoint exception list'
+      );
+    });
+
+    it('should return a 400 if endpoint exception entry has disallowed field', async () => {
+      const fieldName = 'file.Ext.quarantine_path';
+      const badItem = {
+        namespace_type: 'agnostic',
+        description: 'bad endpoint item for testing',
+        name: 'bad endpoint item',
+        list_id: 'endpoint_list',
+        type: 'simple',
+        entries: [
+          {
+            type: 'match',
+            field: fieldName,
+            operator: 'included',
+            value: 'doesnt matter',
+          },
+        ],
+      };
+      const { body } = await supertest
+        .post(`/api/exception_lists/items`)
+        .set('kbn-xsrf', 'xxx')
+        .send(badItem)
+        .expect(400);
+      expect(body.message).to.eql(`cannot add endpoint exception item on field ${fieldName}`);
+    });
+  });
+}

x-pack/test/api_integration/apis/lists/index.ts

@@ -0,0 +1,13 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License;
+ * you may not use this file except in compliance with the Elastic License.
+ */
+import { FtrProviderContext } from '../../ftr_provider_context';
+
+export default function listsAPIIntegrationTests({ loadTestFile }: FtrProviderContext) {
+  describe('Lists plugin', function () {
+    this.tags(['lists']);
+    loadTestFile(require.resolve('./create_exception_list_item'));
+  });
+}

x-pack/test/functional/es_archives/lists/data.json

@@ -0,0 +1,85 @@
+{
+  "type": "doc",
+  "value": {
+    "id": "exception-list-agnostic:1",
+    "index": ".kibana",
+    "source": {
+      "type": "exception-list-agnostic",
+      "exception-list-agnostic": {
+        "_tags": [
+          "endpoint",
+          "process",
+          "malware",
+          "os:linux"
+        ],
+        "created_at": "2020-04-23T00:19:13.289Z",
+        "created_by": "user_name",
+        "description": "This is a sample endpoint type exception list",
+        "list_id": "endpoint_list",
+        "list_type": "list",
+        "name": "Sample Endpoint Exception List",
+        "tags": [
+          "user added string for a tag",
+          "malware"
+        ],
+        "tie_breaker_id": "77fd1909-6786-428a-a671-30229a719c1f",
+        "type": "endpoint",
+        "updated_by": "user_name"
+      }
+    }
+  }
+}
+
+{
+  "type": "doc",
+  "value": {
+    "id": "exception-list-agnostic:2",
+    "index": ".kibana",
+    "source": {
+      "type": "exception-list-agnostic",
+      "exception-list-agnostic": {
+        "_tags": [
+          "endpoint",
+          "process",
+          "malware",
+          "os:linux"
+        ],
+        "comments": [],
+        "created_at": "2020-04-23T00:19:13.289Z",
+        "created_by": "user_name",
+        "description": "This is a sample endpoint type exception",
+        "entries": [
+          {
+            "entries": [
+              {
+                "field": "nested.field",
+                "operator": "included",
+                "type": "match",
+                "value": "some value"
+              }
+            ],
+            "field": "some.parentField",
+            "type": "nested"
+          },
+          {
+            "field": "some.not.nested.field",
+            "operator": "included",
+            "type": "match",
+            "value": "some value"
+          }
+        ],
+        "item_id": "endpoint_list_item",
+        "list_id": "endpoint_list",
+        "list_type": "item",
+        "name": "Sample Endpoint Exception List",
+        "tags": [
+          "user added string for a tag",
+          "malware"
+        ],
+        "tie_breaker_id": "77fd1909-6786-428a-a671-30229a719c1f",
+        "type": "simple",
+        "updated_by": "user_name"
+      }
+    }
+  }
+}