chore: remove use of deprecated ServicePrincipal Mapping (#30832)

They have now been standardized for a few years. We did not initially remove the old mappings out of caution and because we were unsure that the changes has made it to all regions yet. It is long past that happening at this point.

Because we never removed this or marked it as deprecated, we still have a not insignificant amount of customers who believe the individual mapping is necessary and cut tickets because it is not up-to-date.

### Issue # (if applicable)

Closes #<issue number here>.

### Reason for this change



### Description of changes



### Description of how you validated changes



### Checklist
- [ ] My code adheres to the [CONTRIBUTING GUIDE](https://github.com/aws/aws-cdk/blob/main/CONTRIBUTING.md) and [DESIGN GUIDELINES](https://github.com/aws/aws-cdk/blob/main/docs/DESIGN_GUIDELINES.md)

----

*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*

packages/@aws-cdk/aws-pipes-enrichments-alpha/test/__snapshots__/stepfunctions.test.ts.snap

@@ -10,15 +10,7 @@ exports[`stepfunctions should grant pipe role invoke access 1`] = `
             "Action": "sts:AssumeRole",
             "Effect": "Allow",
             "Principal": {
-              "Service": {
-                "Fn::FindInMap": [
-                  "ServiceprincipalMap",
-                  {
-                    "Ref": "AWS::Region",
-                  },
-                  "states",
-                ],
-              },
+              "Service": "states.amazonaws.com",
             },
           },
         ],

packages/@aws-cdk/aws-pipes-targets-alpha/test/__snapshots__/stepfunctions.test.ts.snap

@@ -27,15 +27,7 @@ exports[`step-function should grant pipe role push access (StartAsyncExecution)
             "Action": "sts:AssumeRole",
             "Effect": "Allow",
             "Principal": {
-              "Service": {
-                "Fn::FindInMap": [
-                  "ServiceprincipalMap",
-                  {
-                    "Ref": "AWS::Region",
-                  },
-                  "states",
-                ],
-              },
+              "Service": "states.amazonaws.com",
             },
           },
         ],
@@ -74,15 +66,7 @@ exports[`step-function should grant pipe role push access (StartAsyncExecution)
             "Action": "sts:AssumeRole",
             "Effect": "Allow",
             "Principal": {
-              "Service": {
-                "Fn::FindInMap": [
-                  "ServiceprincipalMap",
-                  {
-                    "Ref": "AWS::Region",
-                  },
-                  "states",
-                ],
-              },
+              "Service": "states.amazonaws.com",
             },
           },
         ],
@@ -121,15 +105,7 @@ exports[`step-function should grant pipe role push access (StartSyncExecution) w
             "Action": "sts:AssumeRole",
             "Effect": "Allow",
             "Principal": {
-              "Service": {
-                "Fn::FindInMap": [
-                  "ServiceprincipalMap",
-                  {
-                    "Ref": "AWS::Region",
-                  },
-                  "states",
-                ],
-              },
+              "Service": "states.amazonaws.com",
             },
           },
         ],

packages/@aws-cdk/cx-api/FEATURE_FLAGS.md

@@ -38,7 +38,6 @@ Flags come in three types:
 | [@aws-cdk/core:enablePartitionLiterals](#aws-cdkcoreenablepartitionliterals) | Make ARNs concrete if AWS partition is known | 2.38.0 | (fix) |
 | [@aws-cdk/aws-ecs:disableExplicitDeploymentControllerForCircuitBreaker](#aws-cdkaws-ecsdisableexplicitdeploymentcontrollerforcircuitbreaker) | Avoid setting the "ECS" deployment controller when adding a circuit breaker | 2.51.0 | (fix) |
 | [@aws-cdk/aws-events:eventsTargetQueueSameAccount](#aws-cdkaws-eventseventstargetqueuesameaccount) | Event Rules may only push to encrypted SQS queues in the same account | 2.51.0 | (fix) |
-| [@aws-cdk/aws-iam:standardizedServicePrincipals](#aws-cdkaws-iamstandardizedserviceprincipals) | Use standardized (global) service principals everywhere | 2.51.0 | (fix) |
 | [@aws-cdk/aws-iam:importedRoleStackSafeDefaultPolicyName](#aws-cdkaws-iamimportedrolestacksafedefaultpolicyname) | Enable this feature to by default create default policy names for imported roles that depend on the stack the role is in. | 2.60.0 | (fix) |
 | [@aws-cdk/aws-s3:serverAccessLogsUseBucketPolicy](#aws-cdkaws-s3serveraccesslogsusebucketpolicy) | Use S3 Bucket Policy instead of ACLs for Server Access Logging | 2.60.0 | (fix) |
 | [@aws-cdk/customresources:installLatestAwsSdkDefault](#aws-cdkcustomresourcesinstalllatestawssdkdefault) | Whether to install the latest SDK by default in AwsCustomResource | 2.60.0 | (default) |
@@ -72,7 +71,7 @@ Flags come in three types:
 | [@aws-cdk/pipelines:reduceAssetRoleTrustScope](#aws-cdkpipelinesreduceassetroletrustscope) | Remove the root account principal from PipelineAssetsFileRole trust policy | 2.141.0 | (default) |
 | [@aws-cdk/aws-ecs:removeDefaultDeploymentAlarm](#aws-cdkaws-ecsremovedefaultdeploymentalarm) | When enabled, remove default deployment alarm settings | 2.143.0 | (default) |
 | [@aws-cdk/custom-resources:logApiResponseDataPropertyTrueDefault](#aws-cdkcustom-resourceslogapiresponsedatapropertytruedefault) | When enabled, the custom resource used for `AwsCustomResource` will configure the `logApiResponseData` property as true by default | 2.145.0 | (fix) |
-| [@aws-cdk/aws-stepfunctions-tasks:ecsReduceRunTaskPermissions](#aws-cdkaws-stepfunctions-tasksecsreduceruntaskpermissions) | When enabled, IAM Policy created to run tasks won't include the task definition ARN, only the revision ARN. | V2NEXT | (fix) |
+| [@aws-cdk/aws-stepfunctions-tasks:ecsReduceRunTaskPermissions](#aws-cdkaws-stepfunctions-tasksecsreduceruntaskpermissions) | When enabled, IAM Policy created to run tasks won't include the task definition ARN, only the revision ARN. | 2.148.0 | (fix) |
 
 <!-- END table -->
 
@@ -101,7 +100,6 @@ The following json shows the current recommended set of flags, as `cdk init` wou
     "@aws-cdk/aws-apigateway:disableCloudWatchRole": true,
     "@aws-cdk/core:enablePartitionLiterals": true,
     "@aws-cdk/aws-events:eventsTargetQueueSameAccount": true,
-    "@aws-cdk/aws-iam:standardizedServicePrincipals": true,
     "@aws-cdk/aws-ecs:disableExplicitDeploymentControllerForCircuitBreaker": true,
     "@aws-cdk/aws-iam:importedRoleStackSafeDefaultPolicyName": true,
     "@aws-cdk/aws-s3:serverAccessLogsUseBucketPolicy": true,
@@ -748,22 +746,6 @@ always apply, regardless of the value of this flag.
 | 2.51.0 | `false` | `true` |
 
 
-### @aws-cdk/aws-iam:standardizedServicePrincipals
-
-*Use standardized (global) service principals everywhere* (fix)
-
-We used to maintain a database of exceptions to Service Principal names in various regions. This database
-is no longer necessary: all service principals names have been standardized to their global form (`SERVICE.amazonaws.com`).
-
-This flag disables use of that exceptions database and always uses the global service principal.
-
-
-| Since | Default | Recommended |
-| ----- | ----- | ----- |
-| (not in v1) |  |  |
-| 2.51.0 | `false` | `true` |
-
-
 ### @aws-cdk/aws-iam:importedRoleStackSafeDefaultPolicyName
 
 *Enable this feature to by default create default policy names for imported roles that depend on the stack the role is in.* (fix)
@@ -1370,7 +1352,7 @@ for more details.
 | Since | Default | Recommended |
 | ----- | ----- | ----- |
 | (not in v1) |  |  |
-| V2NEXT | `false` | `true` |
+| 2.148.0 | `false` | `true` |
 
 
 <!-- END details -->

packages/aws-cdk-lib/aws-codedeploy/test/ecs/deployment-group.test.ts

@@ -140,15 +140,7 @@ describe('CodeDeploy ECS DeploymentGroup', () => {
           Action: 'sts:AssumeRole',
           Effect: 'Allow',
           Principal: {
-            Service: {
-              'Fn::FindInMap': [
-                'ServiceprincipalMap',
-                {
-                  Ref: 'AWS::Region',
-                },
-                'codedeploy',
-              ],
-            },
+            Service: 'codedeploy.amazonaws.com',
           },
         }],
         Version: '2012-10-17',

packages/aws-cdk-lib/aws-codedeploy/test/lambda/deployment-group.test.ts

@@ -94,15 +94,7 @@ describe('CodeDeploy Lambda DeploymentGroup', () => {
           Action: 'sts:AssumeRole',
           Effect: 'Allow',
           Principal: {
-            Service: {
-              'Fn::FindInMap': [
-                'ServiceprincipalMap',
-                {
-                  Ref: 'AWS::Region',
-                },
-                'codedeploy',
-              ],
-            },
+            Service: 'codedeploy.amazonaws.com',
           },
         }],
         Version: '2012-10-17',

packages/aws-cdk-lib/aws-ec2/lib/vpc-endpoint-service.ts

@@ -2,7 +2,7 @@ import { Construct } from 'constructs';
 import { CfnVPCEndpointService, CfnVPCEndpointServicePermissions } from './ec2.generated';
 import { ArnPrincipal } from '../../aws-iam';
 import { Aws, Fn, IResource, Resource, Stack, Token } from '../../core';
-import { Default, RegionInfo } from '../../region-info';
+import { RegionInfo } from '../../region-info';
 
 /**
  * A load balancer that can host a VPC Endpoint Service
@@ -46,6 +46,13 @@ export interface IVpcEndpointService extends IResource {
  */
 export class VpcEndpointService extends Resource implements IVpcEndpointService {
 
+  /**
+   * The default value for a VPC Endpoint Service name prefix, useful if you do
+   * not have a synthesize-time region literal available (all you have is
+   * `{ "Ref": "AWS::Region" }`)
+   */
+  public static readonly DEFAULT_PREFIX = 'com.amazonaws.vpce';
+
   /**
    * One or more network load balancers to host the service.
    * @attribute
@@ -119,8 +126,8 @@ export class VpcEndpointService extends Resource implements IVpcEndpointService
 
     const { region } = Stack.of(this);
     const serviceNamePrefix = !Token.isUnresolved(region) ?
-      (RegionInfo.get(region).vpcEndpointServiceNamePrefix ?? Default.VPC_ENDPOINT_SERVICE_NAME_PREFIX) :
-      Default.VPC_ENDPOINT_SERVICE_NAME_PREFIX;
+      (RegionInfo.get(region).vpcEndpointServiceNamePrefix ?? VpcEndpointService.DEFAULT_PREFIX) :
+      VpcEndpointService.DEFAULT_PREFIX;
 
     this.vpcEndpointServiceName = Fn.join('.', [serviceNamePrefix, Aws.REGION, this.vpcEndpointServiceId]);
     if (this.allowedPrincipals.length > 0) {

packages/aws-cdk-lib/aws-iam/lib/principals.ts

@@ -6,8 +6,7 @@ import { defaultAddPrincipalToAssumeRole } from './private/assume-role-policy';
 import { LITERAL_STRING_KEY, mergePrincipal } from './private/util';
 import { ISamlProvider } from './saml-provider';
 import * as cdk from '../../core';
-import * as cxapi from '../../cx-api';
-import { Default, FactName, RegionInfo } from '../../region-info';
+import { RegionInfo } from '../../region-info';
 
 /**
  * Any object that has an associated principal that a permission can be granted to
@@ -541,11 +540,13 @@ export class ServicePrincipal extends PrincipalBase {
    * These days all service principal names are standardized, and they are all
    * of the form `<servicename>.amazonaws.com`.
    *
-   * If the feature flag `@aws-cdk/aws-iam:standardizedServicePrincipals` is set, this
-   * method will always return its input. If this feature flag is not set, this
-   * method will perform the legacy behavior, which appends the region-specific
-   * domain suffix for some select services (for example, it would append `.cn`
-   * to some service principal names).
+   * To avoid breaking changes, handling is provided for services added with the formats below,
+   * however, no additional handling will be added for new regions or partitions.
+   *   - s3
+   *   - s3.amazonaws.com
+   *   - s3.amazonaws.com.cn
+   *   - s3.c2s.ic.gov
+   *   - s3.sc2s.sgov.gov
    *
    * @example
    * const principalName = iam.ServicePrincipal.servicePrincipalName('ec2.amazonaws.com');
@@ -942,44 +943,28 @@ class ServicePrincipalToken implements cdk.IResolvable {
   }
 
   public resolve(ctx: cdk.IResolveContext) {
-    return cdk.FeatureFlags.of(ctx.scope).isEnabled(cxapi.IAM_STANDARDIZED_SERVICE_PRINCIPALS)
-      ? this.newStandardizedBehavior(ctx)
-      : this.legacyBehavior(ctx);
-
-    // The correct behavior is to always use the global service principal
+    return this.newStandardizedBehavior(ctx);
   }
 
   /**
    * Return the global (original) service principal, and a second one if region is given and points to an opt-in region
    */
   private newStandardizedBehavior(ctx: cdk.IResolveContext) {
     const stack = cdk.Stack.of(ctx.scope);
+
+    // If the user had previously set the feature flag to `false` we would allow them to provide only the service name instead of the
+    // entire service principal. We can't break them so now everyone gets to do it!
+    const match = this.service.match(/^([^.]+)(?:(?:\.amazonaws\.com(?:\.cn)?)|(?:\.c2s\.ic\.gov)|(?:\.sc2s\.sgov\.gov))?$/);
+    const service = match ? `${match[1]}.amazonaws.com` : this.service;
     if (
       this.opts.region &&
       !cdk.Token.isUnresolved(this.opts.region) &&
       stack.region !== this.opts.region &&
       RegionInfo.get(this.opts.region).isOptInRegion
     ) {
-      return this.service.replace(/\.amazonaws\.com$/, `.${this.opts.region}.amazonaws.com`);
-    }
-    return this.service;
-  }
-
-  /**
-   * Do a single lookup
-   */
-  private legacyBehavior(ctx: cdk.IResolveContext) {
-    if (this.opts.region) {
-      // Special case, handle it separately to not break legacy behavior.
-      return RegionInfo.get(this.opts.region).servicePrincipal(this.service) ??
-        Default.servicePrincipal(this.service, this.opts.region, cdk.Aws.URL_SUFFIX);
+      return service.replace(/\.amazonaws\.com$/, `.${this.opts.region}.amazonaws.com`);
     }
-
-    const stack = cdk.Stack.of(ctx.scope);
-    return stack.regionalFact(
-      FactName.servicePrincipal(this.service),
-      Default.servicePrincipal(this.service, stack.region, cdk.Aws.URL_SUFFIX),
-    );
+    return service;
   }
 
   public toString() {

packages/aws-cdk-lib/aws-iam/test/policy-document.test.ts

@@ -1,4 +1,3 @@
-import { testDeprecated } from '@aws-cdk/cdk-build-tools';
 import { Template } from '../../assertions';
 import { Lazy, Stack, Token } from '../../core';
 import {
@@ -464,21 +463,7 @@ describe('IAM policy document', () => {
       expect(stack.resolve(s.toStatementJson())).toEqual({
         Effect: 'Allow',
         Action: 'test:Action',
-        Principal: { Service: 'codedeploy.cn-north-1.amazonaws.com.cn' },
-      });
-    });
-
-    // Deprecated: 'region' parameter to ServicePrincipal shouldn't be used.
-    testDeprecated('regional service principals resolve appropriately (with user-set region)', () => {
-      const stack = new Stack(undefined, undefined, { env: { region: 'cn-northeast-1' } });
-      const s = new PolicyStatement();
-      s.addActions('test:Action');
-      s.addServicePrincipal('codedeploy.amazonaws.com', { region: 'cn-north-1' });
-
-      expect(stack.resolve(s.toStatementJson())).toEqual({
-        Effect: 'Allow',
-        Action: 'test:Action',
-        Principal: { Service: 'codedeploy.cn-north-1.amazonaws.com.cn' },
+        Principal: { Service: 'codedeploy.amazonaws.com' },
       });
     });
 

packages/aws-cdk-lib/aws-iam/test/principals.test.ts

@@ -364,29 +364,13 @@ describe('deprecated ServicePrincipal behavior', () => {
     const afSouthStack = new Stack(undefined, undefined, { env: { region: 'af-south-1' } });
     const principalName = iam.ServicePrincipal.servicePrincipalName('states.amazonaws.com');
 
-    expect(usEastStack.resolve(principalName)).toEqual('states.us-east-1.amazonaws.com');
-    expect(afSouthStack.resolve(principalName)).toEqual('states.af-south-1.amazonaws.com');
+    expect(usEastStack.resolve(principalName)).toEqual('states.amazonaws.com');
+    expect(afSouthStack.resolve(principalName)).toEqual('states.amazonaws.com');
   });
 
   test('Passing non-string as accountId parameter in AccountPrincipal constructor should throw error', () => {
     expect(() => new iam.AccountPrincipal(1234)).toThrowError('accountId should be of type string');
   });
-
-  test('ServicePrincipal in agnostic stack generates lookup table', () => {
-    // GIVEN
-    const stack = new Stack();
-
-    // WHEN
-    new iam.Role(stack, 'Role', {
-      assumedBy: new iam.ServicePrincipal('states.amazonaws.com'),
-    });
-
-    // THEN
-    const template = Template.fromStack(stack);
-    const mappings = template.findMappings('ServiceprincipalMap');
-    expect(mappings.ServiceprincipalMap['af-south-1']?.states).toEqual('states.af-south-1.amazonaws.com');
-    expect(mappings.ServiceprincipalMap['us-east-1']?.states).toEqual('states.us-east-1.amazonaws.com');
-  });
 });
 
 describe('standardized Service Principal behavior', () => {
@@ -396,9 +380,7 @@ describe('standardized Service Principal behavior', () => {
 
   let app: App;
   beforeEach(() => {
-    app = new App({
-      postCliContext: { [cxapi.IAM_STANDARDIZED_SERVICE_PRINCIPALS]: true },
-    });
+    app = new App();
   });
 
   test('no more regional service principals by default', () => {

packages/aws-cdk-lib/aws-logs-destinations/test/kinesis.test.ts

@@ -32,14 +32,7 @@ test('stream can be subscription destination', () => {
         Action: 'sts:AssumeRole',
         Effect: 'Allow',
         Principal: {
-          Service: {
-            'Fn::Join': ['', [
-              'logs.',
-              { Ref: 'AWS::Region' },
-              '.',
-              { Ref: 'AWS::URLSuffix' },
-            ]],
-          },
+          Service: 'logs.amazonaws.com',
         },
       }],
     },
@@ -102,14 +95,7 @@ test('stream can be subscription destination twice, without duplicating permissi
         Action: 'sts:AssumeRole',
         Effect: 'Allow',
         Principal: {
-          Service: {
-            'Fn::Join': ['', [
-              'logs.',
-              { Ref: 'AWS::Region' },
-              '.',
-              { Ref: 'AWS::URLSuffix' },
-            ]],
-          },
+          Service: 'logs.amazonaws.com',
         },
       }],
     },

packages/aws-cdk-lib/custom-resources/test/provider-framework/waiter-state-machine.test.ts

@@ -88,16 +88,7 @@ describe('state machine', () => {
             Action: 'sts:AssumeRole',
             Effect: 'Allow',
             Principal: {
-              Service: {
-                'Fn::Join': [
-                  '',
-                  [
-                    'states.',
-                    stack.resolve(stack.region),
-                    '.amazonaws.com',
-                  ],
-                ],
-              },
+              Service: 'states.amazonaws.com',
             },
           },
         ],