Amazon Cognito
Developer Guide

Using Service-Linked Roles for Amazon Cognito

Amazon Cognito uses AWS Identity and Access Management (IAM) service-linked roles. A service-linked role is a unique type of IAM role that is linked directly to Amazon Cognito. Service-linked roles are predefined by Amazon Cognito and include all the permissions that the service requires to call other AWS services on your behalf.

A service-linked role makes setting up Amazon Cognito easier because you don’t have to manually add the necessary permissions. Amazon Cognito defines the permissions of its service-linked roles, and unless defined otherwise, only Amazon Cognito can assume its roles. The defined permissions include the trust policy and the permissions policy, and that permissions policy cannot be attached to any other IAM entity.

You can delete a service-linked role only after first deleting their related resources. This protects your Amazon Cognito resources because you can't inadvertently remove permission to access the resources.

For information about other services that support service-linked roles, see AWS Services That Work with IAM and look for the services that have Yes in the Service-Linked Role column. Choose a Yes with a link to view the service-linked role documentation for that service.

Service-Linked Role Permissions for Amazon Cognito

Amazon Cognito uses the following service-linked role:

  • AmazonCognitoIdpEmailService – Allows Amazon Cognito User Pools service to use your SES identities for email sending.

The AmazonCognitoIdpEmailService service-linked role trusts the following services to assume the role:

  • email.cognito-idp.amazonaws.com

The role permissions policy allows Amazon Cognito to complete the following actions on the specified resources:

Allowed Actions

  • Action: ses:SendEmail and ses:SendRawEmail

  • Resource: *

The policy denies Amazon Cognito the ability to complete the following actions on the specified resources:

Denied Actions

  • Action: ses:List*

  • Resource: *

With these permissions, Amazon Cognito can use your verified email addresses in Amazon SES only to email your users. Amazon Cognito emails your users when they perform certain actions in the client app for a user pool, such as signing up or resetting a password.

You must configure permissions to allow an IAM entity (such as a user, group, or role) to create, edit, or delete a service-linked role. For more information, see Service-Linked Role Permissions in the IAM User Guide.

Creating a Service-Linked Role for Amazon Cognito

You don't need to manually create a service-linked role. When you configure a user pool to use your Amazon SES configuration to handle email delivery in the AWS Management Console, the AWS CLI, or the Amazon Cognito API, Amazon Cognito creates the service-linked role for you.

If you delete this service-linked role, and then need to create it again, you can use the same process to recreate the role in your account. When you configure a user pool to use your Amazon SES configuration to handle email delivery, Amazon Cognito creates the service-linked role for you again.

Before Amazon Cognito can create this role, the IAM permissions that you use to set up your user pool must include the iam:CreateServiceLinkedRole action. For more information about updating permissions in IAM, see Changing Permissions for an IAM User in the IAM User Guide.

Editing a Service-Linked Role for Amazon Cognito

Amazon Cognito does not allow you to edit the AmazonCognitoIdpEmailService service-linked role. After you create a service-linked role, you cannot change the name of the role because various entities might reference the role. However, you can edit the description of the role using IAM. For more information, see Editing a Service-Linked Role in the IAM User Guide.

Deleting a Service-Linked Role for Amazon Cognito

If you no longer need to use a feature or service that requires a service-linked role, we recommend that you delete that role. That way you don’t have an unused entity that is not actively monitored or maintained. Before you can delete the AmazonCognitoIdpEmailService role, you must do either of the following for each user pool that uses the role:

  • Delete the user pool.

  • Update the email settings in the user pool to use the default email functionality. The default setting does not use the service-linked role.

Remember to do these actions in each AWS region that contains a user pool that uses the role.

Note

If the Amazon Cognito service is using the role when you try to delete the resources, then the deletion might fail. If that happens, wait for a few minutes and try the operation again.

To delete an Amazon Cognito user pool

  1. Sign in the AWS Management Console and open the Amazon Cognito console at https://console.aws.amazon.com/cognito.

  2. Choose Manage User Pools.

  3. On the Your User Pools page, choose the user pool that you want to delete.

  4. Choose Delete pool.

  5. In the Delete user pool window, type delete, and choose Delete pool.

To update an Amazon Cognito user pool to use the default email functionality

  1. Sign in the AWS Management Console and open the Amazon Cognito console at https://console.aws.amazon.com/cognito.

  2. Choose Manage User Pools.

  3. On the Your User Pools page, choose the user pool that you want to update.

  4. In the navigation menu on the left, choose Message customizations.

  5. Under Do you want to send emails through your Amazon SES Configuration?, choose No - Use Cognito (Default).

  6. When you finish setting your email account options, choose Save changes.

To manually delete the service-linked role using IAM

Use the IAM console, the AWS CLI, or the AWS API to delete the AmazonCognitoIdpEmailService service-linked role. For more information, see Deleting a Service-Linked Role in the IAM User Guide.

Supported Regions for Amazon Cognito Service-Linked Roles

Amazon Cognito supports using service-linked roles in all of the regions where the service is available. For more information, see AWS Regions and Endpoints.