No detection of bad policy in sts.GetFederationToken

[wunderbarb]

Is there an existing issue for this?

• I have searched the existing issues

Current Behavior

localstack accepts policy with a defined Principal. This is not true for real AWS.
Example: { "Version":"2012-10-17", "Statement":[ { "Sid":"AllowUploads", "Effect":"Allow", "Principal":{"AWS":"*"}, "Action":"s3:PutObject", "Resource":"arn:aws:s3:::%s/*" } ] }

Expected Behavior

There should be an error Policy document should not specify a principal.

How are you starting LocalStack?

With the localstack script

Steps To Reproduce

How are you starting localstack (e.g., bin/localstack command, arguments, or docker-compose.yml)

docker run localstack/localstack

Client commands (e.g., AWS SDK code snippet, or sequence of "awslocal" commands)

awslocal s3 mb s3://mybucket

Environment

- OS: Ubuntu 20.4
- LocalStack: 3.2.1.dev20240307125457
Version Pro

Anything else?

No response