[Security Solution] [Detections] Add "read index" privilege check on rule execution (#83134)

* adds privilege check in rule execution function, need to abstract these lines into a util function to be used in create rules and use that check on the UI too

* fixes tests

* cleanup code, adds a unit test

* set rule to failure status if the rule does not have read privileges to ANY of the index patterns provided

x-pack/plugins/security_solution/server/lib/detection_engine/signals/signal_rule_alert_type.test.ts

@@ -16,6 +16,7 @@ import {
   getListsClient,
   getExceptions,
   sortExceptionItems,
+  checkPrivileges,
 } from './utils';
 import { parseScheduleDates } from '../../../../common/detection_engine/parse_schedule_dates';
 import { RuleExecutorOptions, SearchAfterAndBulkCreateReturnType } from './types';
@@ -42,6 +43,7 @@ jest.mock('./utils', () => {
     getListsClient: jest.fn(),
     getExceptions: jest.fn(),
     sortExceptionItems: jest.fn(),
+    checkPrivileges: jest.fn(),
   };
 });
 jest.mock('../notifications/schedule_notification_actions');
@@ -105,6 +107,7 @@ describe('rules_notification_alert_type', () => {
       find: jest.fn(),
       goingToRun: jest.fn(),
       error: jest.fn(),
+      partialFailure: jest.fn(),
     };
     (ruleStatusServiceFactory as jest.Mock).mockReturnValue(ruleStatusService);
     (getGapBetweenRuns as jest.Mock).mockReturnValue(moment.duration(0));
@@ -124,6 +127,21 @@ describe('rules_notification_alert_type', () => {
       searchAfterTimes: [],
       createdSignalsCount: 10,
     });
+    (checkPrivileges as jest.Mock).mockImplementation((_, indices) => {
+      return {
+        index: indices.reduce(
+          (acc: { index: { [x: string]: { read: boolean } } }, index: string) => {
+            return {
+              [index]: {
+                read: true,
+              },
+              ...acc,
+            };
+          },
+          {}
+        ),
+      };
+    });
     alertServices.callCluster.mockResolvedValue({
       hits: {
         total: { value: 10 },
@@ -170,6 +188,52 @@ describe('rules_notification_alert_type', () => {
       });
     });
 
+    it('should set a partial failure for when rules cannot read ALL provided indices', async () => {
+      (checkPrivileges as jest.Mock).mockResolvedValueOnce({
+        username: 'elastic',
+        has_all_requested: false,
+        cluster: {},
+        index: {
+          'myfa*': {
+            read: true,
+          },
+          'some*': {
+            read: false,
+          },
+        },
+        application: {},
+      });
+      payload.params.index = ['some*', 'myfa*'];
+      await alert.executor(payload);
+      expect(ruleStatusService.partialFailure).toHaveBeenCalled();
+      expect(ruleStatusService.partialFailure.mock.calls[0][0]).toContain(
+        'Missing required read permissions on indexes: ["some*"]'
+      );
+    });
+
+    it('should set a failure status for when rules cannot read ANY provided indices', async () => {
+      (checkPrivileges as jest.Mock).mockResolvedValueOnce({
+        username: 'elastic',
+        has_all_requested: false,
+        cluster: {},
+        index: {
+          'myfa*': {
+            read: false,
+          },
+          'some*': {
+            read: false,
+          },
+        },
+        application: {},
+      });
+      payload.params.index = ['some*', 'myfa*'];
+      await alert.executor(payload);
+      expect(ruleStatusService.error).toHaveBeenCalled();
+      expect(ruleStatusService.error.mock.calls[0][0]).toContain(
+        'The rule does not have read privileges to any of the following indices: ["myfa*","some*"]'
+      );
+    });
+
     it('should NOT warn about the gap between runs if gap small', async () => {
       (getGapBetweenRuns as jest.Mock).mockReturnValue(moment.duration(1, 'm'));
       (getGapMaxCatchupRatio as jest.Mock).mockReturnValue({

x-pack/plugins/security_solution/server/lib/detection_engine/signals/signal_rule_alert_type.ts

@@ -7,6 +7,7 @@
 /* eslint-disable complexity */
 
 import { Logger, KibanaRequest } from 'src/core/server';
+import { partition } from 'lodash';
 
 import {
   SIGNALS_ID,
@@ -41,6 +42,7 @@ import {
   createSearchAfterReturnType,
   mergeReturns,
   createSearchAfterReturnTypeFromResponse,
+  checkPrivileges,
 } from './utils';
 import { signalParamsSchema } from './signal_params_schema';
 import { siemRuleActionGroups } from './siem_rule_action_groups';
@@ -171,8 +173,51 @@ export const signalRulesAlertType = ({
 
       logger.debug(buildRuleMessage('[+] Starting Signal Rule execution'));
       logger.debug(buildRuleMessage(`interval: ${interval}`));
+      let wroteStatus = false;
       await ruleStatusService.goingToRun();
 
+      // check if rule has permissions to access given index pattern
+      // move this collection of lines into a function in utils
+      // so that we can use it in create rules route, bulk, etc.
+      try {
+        const inputIndex = await getInputIndex(services, version, index);
+        const privileges = await checkPrivileges(services, inputIndex);
+
+        const indexNames = Object.keys(privileges.index);
+        const [indexesWithReadPrivileges, indexesWithNoReadPrivileges] = partition(
+          indexNames,
+          (indexName) => privileges.index[indexName].read
+        );
+
+        if (
+          indexesWithReadPrivileges.length > 0 &&
+          indexesWithNoReadPrivileges.length >= indexesWithReadPrivileges.length
+        ) {
+          // some indices have read privileges others do not.
+          // set a partial failure status
+          const errorString = `Missing required read permissions on indexes: ${JSON.stringify(
+            indexesWithNoReadPrivileges
+          )}`;
+          logger.debug(buildRuleMessage(errorString));
+          await ruleStatusService.partialFailure(errorString);
+          wroteStatus = true;
+        } else if (
+          indexesWithReadPrivileges.length === 0 &&
+          indexesWithNoReadPrivileges.length === indexNames.length
+        ) {
+          // none of the indices had read privileges so set the status to failed
+          // since we can't search on any indices we do not have read privileges on
+          const errorString = `The rule does not have read privileges to any of the following indices: ${JSON.stringify(
+            indexesWithNoReadPrivileges
+          )}`;
+          logger.debug(buildRuleMessage(errorString));
+          await ruleStatusService.error(errorString);
+          wroteStatus = true;
+        }
+      } catch (exc) {
+        logger.error(buildRuleMessage(`Check privileges failed to execute ${exc}`));
+      }
+
       const gap = getGapBetweenRuns({ previousStartedAt, interval, from, to });
       if (gap != null && gap.asMilliseconds() > 0) {
         const fromUnit = from[from.length - 1];
@@ -600,7 +645,7 @@ export const signalRulesAlertType = ({
               `[+] Finished indexing ${result.createdSignalsCount} signals into ${outputIndex}`
             )
           );
-          if (!hasError) {
+          if (!hasError && !wroteStatus) {
             await ruleStatusService.success('succeeded', {
               bulkCreateTimeDurations: result.bulkCreateTimes,
               searchAfterTimeDurations: result.searchAfterTimes,

x-pack/plugins/security_solution/server/lib/detection_engine/signals/utils.ts

@@ -52,6 +52,20 @@ export const shorthandMap = {
   },
 };
 
+export const checkPrivileges = async (services: AlertServices, indices: string[]) =>
+  services.callCluster('transport.request', {
+    path: '/_security/user/_has_privileges',
+    method: 'POST',
+    body: {
+      index: [
+        {
+          names: indices ?? [],
+          privileges: ['read'],
+        },
+      ],
+    },
+  });
+
 export const getGapMaxCatchupRatio = ({
   logger,
   previousStartedAt,