CODEWITHSUNDEEP
amazon-web-servicesaws-lambda
Keith Rockhold
Keith Rockhold

Reputation: 124

AWS Lambda SQS Trigger Assume role

I have been given a task to consume messages from an SQS queue from an external company which returns me a bucket and key from which I am to copy a file. This external company has set up a role that I can assume that gives me access to the SQS queue and the S3 bucket, but I have a problem. How do I assume that external role for my Lambda trigger? Is this even possible?

Upvotes: 0

Views: 701

Answers (1)

Erico
Erico

Reputation: 1461

You'll assume the role in your Lambda and then interact with the external AWS account using temporary credentials.

Example with python.

import boto3

sts = boto3.client('sts')

role = sts.assume_role(
   RoleArn="arn:aws:iam::EXTERNAL_COMPANY_ACCOUND_ID:role/EXTERNAL_COMPANY_ROLE",
   ExternalId="EXTERNAL_ID_CONFIGURED",
   RoleSessionName="RoleSessionNameYouWant")

credentials = role['Credentials']

# Interact with resoures from the external company account
external_session = boto3.Session(
    aws_access_key_id=credentials['AccessKeyId'],
    aws_secret_access_key=credentials['SecretAccessKey'],
    aws_session_token=credentials['SessionToken'])

s3 = external_session.client('s3'),
sqs = external_session.client('sqs')

An external ID is optional but important when roles are given to third-parties to avoid the confused deputy problem. Ask the third-party to configure an external id for your role if that wasn't done.

Upvotes: 2

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