[Alerting] Exempt Alerts pre 7.10 from RBAC on their Action execution…

… until updated (elastic#75563)

Marks all Alerts with a `versionApiKeyLastmodified ` field that tracks what version the alert's Api Key was last updated in. We then use this field to exempt legacy alerts (created pre `7.10.0`) in order to use a _dialed down_ version of RBAC which should allow old alerts to continue to function after the upgrade, until they are updates (at which point they will no longer be **Legacy**).

More details here: elastic#74858 (comment)

x-pack/plugins/actions/README.md

@@ -280,12 +280,14 @@ The following table describes the properties of the `options` object.
 | params   | The `params` value to give the action type executor.                                                   | object |
 | spaceId  | The space id the action is within.                                                                     | string |
 | apiKey   | The Elasticsearch API key to use for context. (Note: only required and used when security is enabled). | string |
+| source   | The source of the execution, either an HTTP request or a reference to a Saved Object.                  | object, optional |
 
 ## Example
 
 This example makes action `3c5b2bd4-5424-4e4b-8cf5-c0a58c762cc5` send an email. The action plugin will load the saved object and find what action type to call with `params`.
 
 ```typescript
+const request: KibanaRequest = { ... };
 const actionsClient = await server.plugins.actions.getActionsClientWithRequest(request);
 await actionsClient.enqueueExecution({
   id: '3c5b2bd4-5424-4e4b-8cf5-c0a58c762cc5',
@@ -296,6 +298,7 @@ await actionsClient.enqueueExecution({
     subject: 'My email subject',
     body: 'My email body',
   },
+  source: asHttpRequestExecutionSource(request),
 });
 ```
 
@@ -305,10 +308,11 @@ This api runs the action and asynchronously returns the result of running the ac
 
 The following table describes the properties of the `options` object.
 
-| Property | Description                                          | Type   |
-| -------- | ---------------------------------------------------- | ------ |
-| id       | The id of the action you want to execute.            | string |
-| params   | The `params` value to give the action type executor. | object |
+| Property | Description                                                                          | Type   |
+| -------- | ------------------------------------------------------------------------------------ | ------ |
+| id       | The id of the action you want to execute.                                            | string |
+| params   | The `params` value to give the action type executor.                                 | object |
+| source   | The source of the execution, either an HTTP request or a reference to a Saved Object.| object, optional |
 
 ## Example
 
@@ -324,6 +328,10 @@ const result = await actionsClient.execute({
     subject: 'My email subject',
     body: 'My email body',
   },
+  source: asSavedObjectExecutionSource({
+    id: '573891ae-8c48-49cb-a197-0cd5ec34a88b',
+    type: 'alert'
+  }),
 });
 ```
 

x-pack/plugins/actions/server/actions_client.ts

@@ -30,6 +30,7 @@ import {
 } from './create_execute_function';
 import { ActionsAuthorization } from './authorization/actions_authorization';
 import { ActionType } from '../common';
+import { shouldLegacyRbacApplyBySource } from './authorization/should_legacy_rbac_apply_by_source';
 
 // We are assuming there won't be many actions. This is why we will load
 // all the actions in advance and assume the total count to not go over 10000.
@@ -298,13 +299,19 @@ export class ActionsClient {
   public async execute({
     actionId,
     params,
+    source,
   }: Omit<ExecuteOptions, 'request'>): Promise<ActionTypeExecutorResult<unknown>> {
-    await this.authorization.ensureAuthorized('execute');
-    return this.actionExecutor.execute({ actionId, params, request: this.request });
+    if (!(await shouldLegacyRbacApplyBySource(this.unsecuredSavedObjectsClient, source))) {
+      await this.authorization.ensureAuthorized('execute');
+    }
+    return this.actionExecutor.execute({ actionId, params, source, request: this.request });
   }
 
   public async enqueueExecution(options: EnqueueExecutionOptions): Promise<void> {
-    await this.authorization.ensureAuthorized('execute');
+    const { source } = options;
+    if (!(await shouldLegacyRbacApplyBySource(this.unsecuredSavedObjectsClient, source))) {
+      await this.authorization.ensureAuthorized('execute');
+    }
     return this.executionEnqueuer(this.unsecuredSavedObjectsClient, options);
   }
 

x-pack/plugins/actions/server/authorization/actions_authorization.test.ts

@@ -9,6 +9,7 @@ import { ActionsAuthorization } from './actions_authorization';
 import { actionsAuthorizationAuditLoggerMock } from './audit_logger.mock';
 import { ActionsAuthorizationAuditLogger, AuthorizationResult } from './audit_logger';
 import { ACTION_SAVED_OBJECT_TYPE, ACTION_TASK_PARAMS_SAVED_OBJECT_TYPE } from '../saved_objects';
+import { AuthenticatedUser } from '../../../security/server';
 
 const request = {} as KibanaRequest;
 
@@ -19,12 +20,13 @@ const mockAuthorizationAction = (type: string, operation: string) => `${type}/${
 function mockSecurity() {
   const security = securityMock.createSetup();
   const authorization = security.authz;
+  const authentication = security.authc;
   // typescript is having trouble inferring jest's automocking
   (authorization.actions.savedObject.get as jest.MockedFunction<
     typeof authorization.actions.savedObject.get
   >).mockImplementation(mockAuthorizationAction);
   authorization.mode.useRbacForRequest.mockReturnValue(true);
-  return { authorization };
+  return { authorization, authentication };
 }
 
 beforeEach(() => {
@@ -192,4 +194,38 @@ describe('ensureAuthorized', () => {
       ]
     `);
   });
+
+  test('exempts users from requiring privileges to execute actions when shouldUseLegacyRbac is true', async () => {
+    const { authorization, authentication } = mockSecurity();
+    const checkPrivileges: jest.MockedFunction<ReturnType<
+      typeof authorization.checkPrivilegesDynamicallyWithRequest
+    >> = jest.fn();
+    authorization.checkPrivilegesDynamicallyWithRequest.mockReturnValue(checkPrivileges);
+    const actionsAuthorization = new ActionsAuthorization({
+      request,
+      authorization,
+      authentication,
+      auditLogger,
+      shouldUseLegacyRbac: true,
+    });
+
+    authentication.getCurrentUser.mockReturnValueOnce(({
+      username: 'some-user',
+    } as unknown) as AuthenticatedUser);
+
+    await actionsAuthorization.ensureAuthorized('execute', 'myType');
+
+    expect(authorization.actions.savedObject.get).not.toHaveBeenCalled();
+    expect(checkPrivileges).not.toHaveBeenCalled();
+
+    expect(auditLogger.actionsAuthorizationSuccess).toHaveBeenCalledTimes(1);
+    expect(auditLogger.actionsAuthorizationFailure).not.toHaveBeenCalled();
+    expect(auditLogger.actionsAuthorizationSuccess.mock.calls[0]).toMatchInlineSnapshot(`
+      Array [
+        "some-user",
+        "execute",
+        "myType",
+      ]
+    `);
+  });
 });

x-pack/plugins/actions/server/authorization/actions_authorization.ts

@@ -14,6 +14,15 @@ export interface ConstructorOptions {
   request: KibanaRequest;
   auditLogger: ActionsAuthorizationAuditLogger;
   authorization?: SecurityPluginSetup['authz'];
+  authentication?: SecurityPluginSetup['authc'];
+  // In order to support legacy Alerts which predate the introduction of the
+  // Actions feature in Kibana we need a way of "dialing down" the level of
+  // authorization for certain opearations.
+  // Specifically, we want to allow these old alerts and their scheduled
+  // actions to continue to execute - which requires that we exempt auth on
+  // `get` for Connectors and `execute` for Action execution when used by
+  // these legacy alerts
+  shouldUseLegacyRbac?: boolean;
 }
 
 const operationAlias: Record<
@@ -27,33 +36,57 @@ const operationAlias: Record<
   list: (authorization) => authorization.actions.savedObject.get(ACTION_SAVED_OBJECT_TYPE, 'find'),
 };
 
+const LEGACY_RBAC_EXEMPT_OPERATIONS = new Set(['get', 'execute']);
+
 export class ActionsAuthorization {
   private readonly request: KibanaRequest;
   private readonly authorization?: SecurityPluginSetup['authz'];
+  private readonly authentication?: SecurityPluginSetup['authc'];
   private readonly auditLogger: ActionsAuthorizationAuditLogger;
+  private readonly shouldUseLegacyRbac: boolean;
 
-  constructor({ request, authorization, auditLogger }: ConstructorOptions) {
+  constructor({
+    request,
+    authorization,
+    authentication,
+    auditLogger,
+    shouldUseLegacyRbac = false,
+  }: ConstructorOptions) {
     this.request = request;
     this.authorization = authorization;
+    this.authentication = authentication;
     this.auditLogger = auditLogger;
+    this.shouldUseLegacyRbac = shouldUseLegacyRbac;
   }
 
   public async ensureAuthorized(operation: string, actionTypeId?: string) {
     const { authorization } = this;
     if (authorization?.mode?.useRbacForRequest(this.request)) {
-      const checkPrivileges = authorization.checkPrivilegesDynamicallyWithRequest(this.request);
-      const { hasAllRequested, username } = await checkPrivileges({
-        kibana: operationAlias[operation]
-          ? operationAlias[operation](authorization)
-          : authorization.actions.savedObject.get(ACTION_SAVED_OBJECT_TYPE, operation),
-      });
-      if (hasAllRequested) {
-        this.auditLogger.actionsAuthorizationSuccess(username, operation, actionTypeId);
-      } else {
-        throw Boom.forbidden(
-          this.auditLogger.actionsAuthorizationFailure(username, operation, actionTypeId)
+      if (this.isOperationExemptDueToLegacyRbac(operation)) {
+        this.auditLogger.actionsAuthorizationSuccess(
+          this.authentication?.getCurrentUser(this.request)?.username ?? '',
+          operation,
+          actionTypeId
         );
+      } else {
+        const checkPrivileges = authorization.checkPrivilegesDynamicallyWithRequest(this.request);
+        const { hasAllRequested, username } = await checkPrivileges({
+          kibana: operationAlias[operation]
+            ? operationAlias[operation](authorization)
+            : authorization.actions.savedObject.get(ACTION_SAVED_OBJECT_TYPE, operation),
+        });
+        if (hasAllRequested) {
+          this.auditLogger.actionsAuthorizationSuccess(username, operation, actionTypeId);
+        } else {
+          throw Boom.forbidden(
+            this.auditLogger.actionsAuthorizationFailure(username, operation, actionTypeId)
+          );
+        }
       }
     }
   }
+
+  private isOperationExemptDueToLegacyRbac(operation: string) {
+    return this.shouldUseLegacyRbac && LEGACY_RBAC_EXEMPT_OPERATIONS.has(operation);
+  }
 }

x-pack/plugins/actions/server/authorization/should_legacy_rbac_apply_by_source.test.ts

@@ -0,0 +1,114 @@
+/*
+ * 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 { shouldLegacyRbacApplyBySource } from './should_legacy_rbac_apply_by_source';
+import { savedObjectsClientMock } from '../../../../../src/core/server/mocks';
+import uuid from 'uuid';
+import { asSavedObjectExecutionSource } from '../lib';
+
+const unsecuredSavedObjectsClient = savedObjectsClientMock.create();
+
+describe(`#shouldLegacyRbacApplyBySource`, () => {
+  test('should return false if no source is provided', async () => {
+    expect(await shouldLegacyRbacApplyBySource(unsecuredSavedObjectsClient)).toEqual(false);
+  });
+
+  test('should return false if source is not an alert', async () => {
+    expect(
+      await shouldLegacyRbacApplyBySource(
+        unsecuredSavedObjectsClient,
+        asSavedObjectExecutionSource({
+          type: 'action',
+          id: uuid.v4(),
+        })
+      )
+    ).toEqual(false);
+  });
+
+  test('should return false if source alert is not marked as legacy', async () => {
+    const id = uuid.v4();
+    unsecuredSavedObjectsClient.get.mockResolvedValue(mockAlert({ id }));
+    expect(
+      await shouldLegacyRbacApplyBySource(
+        unsecuredSavedObjectsClient,
+        asSavedObjectExecutionSource({
+          type: 'alert',
+          id,
+        })
+      )
+    ).toEqual(false);
+  });
+
+  test('should return true if source alert is marked as legacy', async () => {
+    const id = uuid.v4();
+    unsecuredSavedObjectsClient.get.mockResolvedValue(
+      mockAlert({ id, attributes: { meta: { versionApiKeyLastmodified: 'pre-7.10.0' } } })
+    );
+    expect(
+      await shouldLegacyRbacApplyBySource(
+        unsecuredSavedObjectsClient,
+        asSavedObjectExecutionSource({
+          type: 'alert',
+          id,
+        })
+      )
+    ).toEqual(true);
+  });
+
+  test('should return false if source alert is marked as modern', async () => {
+    const id = uuid.v4();
+    unsecuredSavedObjectsClient.get.mockResolvedValue(
+      mockAlert({ id, attributes: { meta: { versionApiKeyLastmodified: '7.10.0' } } })
+    );
+    expect(
+      await shouldLegacyRbacApplyBySource(
+        unsecuredSavedObjectsClient,
+        asSavedObjectExecutionSource({
+          type: 'alert',
+          id,
+        })
+      )
+    ).toEqual(false);
+  });
+
+  test('should return false if source alert is marked with a last modified version', async () => {
+    const id = uuid.v4();
+    unsecuredSavedObjectsClient.get.mockResolvedValue(mockAlert({ id, attributes: { meta: {} } }));
+    expect(
+      await shouldLegacyRbacApplyBySource(
+        unsecuredSavedObjectsClient,
+        asSavedObjectExecutionSource({
+          type: 'alert',
+          id,
+        })
+      )
+    ).toEqual(false);
+  });
+});
+
+const mockAlert = (overrides: Record<string, unknown> = {}) => ({
+  id: '1',
+  type: 'alert',
+  attributes: {
+    consumer: 'myApp',
+    schedule: { interval: '10s' },
+    alertTypeId: 'myType',
+    enabled: false,
+    actions: [
+      {
+        group: 'default',
+        id: '1',
+        actionTypeId: '1',
+        actionRef: '1',
+        params: {
+          foo: true,
+        },
+      },
+    ],
+  },
+  version: '123',
+  references: [],
+  ...overrides,
+});

x-pack/plugins/actions/server/authorization/should_legacy_rbac_apply_by_source.ts

@@ -0,0 +1,27 @@
+/*
+ * 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 { SavedObjectsClientContract } from 'src/core/server';
+import { ActionExecutionSource, isSavedObjectExecutionSource } from '../lib';
+import { ALERT_SAVED_OBJECT_TYPE } from '../saved_objects';
+
+const LEGACY_VERSION = 'pre-7.10.0';
+
+export async function shouldLegacyRbacApplyBySource(
+  unsecuredSavedObjectsClient: SavedObjectsClientContract,
+  executionSource?: ActionExecutionSource<unknown>
+): Promise<boolean> {
+  return isSavedObjectExecutionSource(executionSource) &&
+    executionSource?.source?.type === ALERT_SAVED_OBJECT_TYPE
+    ? (
+        await unsecuredSavedObjectsClient.get<{
+          meta?: {
+            versionApiKeyLastmodified?: string;
+          };
+        }>(ALERT_SAVED_OBJECT_TYPE, executionSource.source.id)
+      ).attributes.meta?.versionApiKeyLastmodified === LEGACY_VERSION
+    : false;
+}