Use GetFederationToken with an Amazon SDK or command line tool

To return a set of temporary security credentials using IAM user access key credentials

The following get-federation-token example returns a set of temporary security credentials (consisting of an access key ID, a secret access key, and a security token) for a user. You must call the GetFederationToken operation using the long-term security credentials of an IAM user.

aws sts get-federation-token \
    --name Bob \
    --policy file://myfile.json \
    --policy-arns arn=arn:aws:iam::aws:policy/AmazonS3ReadOnlyAccess \
    --duration-seconds 900

Contents of myfile.json:

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Allow",
            "Action": "ec2:Describe*",
            "Resource": "*"
        },
        {
            "Effect": "Allow",
            "Action": "elasticloadbalancing:Describe*",
            "Resource": "*"
        },
        {
            "Effect": "Allow",
            "Action": [
                "cloudwatch:ListMetrics",
                "cloudwatch:GetMetricStatistics",
                "cloudwatch:Describe*"
            ],
            "Resource": "*"
        },
        {
            "Effect": "Allow",
            "Action": "autoscaling:Describe*",
            "Resource": "*"
        }
    ]
}

Output:

{
    "Credentials": {
        "AccessKeyId": "ASIAIOSFODNN7EXAMPLE",
        "SecretAccessKey": "wJalrXUtnFEMI/K7MDENG/bPxRfiCYEXAMPLEKEY",
        "SessionToken": "EXAMPLEpZ2luX2VjEGoaCXVzLXdlc3QtMiJIMEYCIQC/W9pL5ArQyDD5JwFL3/h5+WGopQ24GEXweNctwhi9sgIhAMkg+MZE35iWM8s4r5Lr25f9rSTVPFH98G42QQunWMTfKq0DCOP//////////wEQAxoMNDUyOTI1MTcwNTA3Igxuy3AOpuuoLsk3MJwqgQPg8QOd9HuoClUxq26wnc/nm+eZLjHDyGf2KUAHK2DuaS/nrGSEXAMPLE",
        "Expiration": "2023-12-20T02:06:07+00:00"
    },
    "FederatedUser": {
        "FederatedUserId": "111122223333:Bob",
        "Arn": "arn:aws:sts::111122223333:federated-user/Bob"
    },
    "PackedPolicySize": 36
}

For more information, see Requesting Temporary Security Credentials in the Amazon IAM User Guide.

Example 1: Requests a federated token valid for one hour using "Bob" as the name of the federated user. This name can be used to reference the federated user name in a resource-based policy (such as an Amazon S3 bucket policy). The supplied IAM policy, in JSON format, is used to scope down the permissions that are available to the IAM user. The supplied policy cannot grant more permissions than those granted to the requesting user, with the final permissions for the federated user being the most restrictive set based on the intersection of the passed policy and the IAM user policy.

Get-STSFederationToken -Name "Bob" -Policy "...JSON policy..." -DurationInSeconds 3600