AWS Sts Assume Role In One Command


Answer :

Finally, a colleague shared with me this awesome snippet that gets the work done in one go:

eval $(aws sts assume-role --role-arn arn:aws:iam::123456789123:role/myAwesomeRole --role-session-name test | jq -r '.Credentials | "export AWS_ACCESS_KEY_ID=\(.AccessKeyId)\nexport AWS_SECRET_ACCESS_KEY=\(.SecretAccessKey)\nexport AWS_SESSION_TOKEN=\(.SessionToken)\n"')

Apart from the AWS CLI, it only requires jq which is usually installed in any Linux Desktop.


You can store an IAM Role as a profile in the AWS CLI and it will automatically assume the role for you.

Here is an example from Using an IAM role in the AWS CLI - AWS Command Line Interface:

[profile marketingadmin] role_arn = arn:aws:iam::123456789012:role/marketingadminrole source_profile = user1

This is saying:

  • If a user specifies --profile marketingadmin
  • Then use the credentials of profile user1
  • To call AssumeRole on the specified role

This means you can simply call a command like this and it will assume the role and use the returned credentials automatically:

aws s3 ls --profile marketingadmin

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