Are there any hooks to listen for MFA resets in Cognito?

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We want to be able to automatically send an email telling the user their MFA has been reset. Is there a way to hook into this to allow us to trigger an email when MFA is reset?

2 Answers
1

Hello,

Unfortunately, I regret to inform that your use-case is currently not supported by Cognito User pool using any features such as “Message Customisations” or “Lambda Triggers”.

Thank you for providing your valuable feedback on the service. I have raised a feature request with the service team on your behalf. While I am unable to comment on if/when this feature may get released, I request you to keep an eye on our https://aws.amazon.com/blogs/aws/ and http://aws.amazon.com/new for any new feature announcements.

References: [+] https://repost.aws/knowledge-center/cognito-user-pool-totp-mfa

[+] Customizing user pool workflows with Lambda triggers - https://docs.aws.amazon.com/cognito/latest/developerguide/cognito-user-pools-working-with-lambda-triggers.html

AWS
answered a month ago
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Yes, there is a way to automatically send an email to users when their MFA (Multi-Factor Authentication) has been reset in AWS. You can achieve this by leveraging AWS CloudWatch Events and AWS Lambda.

Here's a step-by-step process to set this up:

  1. Create an AWS CloudWatch Event Rule:

    • In the AWS Management Console, navigate to the CloudWatch service.
    • Go to the "Events" section and create a new rule.
    • For the "Event Source", choose "AWS Events" and select the event source "AWS Identity and Access Management (IAM)".
    • Under "Event Type", choose the event "AWS API Call via CloudTrail" and select the event name "ResetMFADevice".
  2. Create an AWS Lambda Function:

    • In the AWS Management Console, navigate to the Lambda service.
    • Create a new Lambda function that will be triggered by the CloudWatch Event rule.
    • In the function code, write the logic to send the email to the user. You can use an email service like Amazon SES (Simple Email Service) or integrate with a third-party email provider.
    • The Lambda function should receive the event data from the CloudWatch Event, which will contain information about the user whose MFA was reset.
  3. Configure the CloudWatch Event Rule to Trigger the Lambda Function:

    • In the CloudWatch Event rule you created earlier, configure the "Target" to be the Lambda function you just created.
    • Ensure that the Lambda function has the necessary permissions to access the email service (e.g., Amazon SES) and retrieve the user information from the event data.

Here's a sample Lambda function in Python that sends an email using Amazon SES when an MFA device is reset:

import boto3
import os

def lambda_handler(event, context):
    # Extract the user information from the event data
    user_name = event['detail']['userIdentity']['userName']

    # Set up the email parameters
    sender = 'sender@example.com'
    recipient = 'user@example.com'
    subject = 'MFA Device Reset'
    body_text = f"Hello {user_name},\n\nYour MFA device has been reset. If you did not request this, please contact your IT administrator immediately."

    # Initialize the Amazon SES client
    ses = boto3.client('ses', region_name='us-west-2')

    # Send the email
    response = ses.send_email(
        Destination={
            'ToAddresses': [
                recipient,
            ]
        },
        Message={
            'Body': {
                'Text': {
                    'Charset': 'UTF-8',
                    'Data': body_text,
                }
            },
            'Subject': {
                'Charset': 'UTF-8',
                'Data': subject,
            }
        },
        Source=sender
    )

    return {
        'statusCode': 200,
        'body': 'Email sent successfully'
    }

Make sure to replace the placeholders (sender, recipient, user_name) with the appropriate values for your use case.

By setting up this CloudWatch Event and Lambda function, you can automatically trigger an email notification to users whenever their MFA device is reset in your AWS environment.

answered a month ago

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