Example: AppStream 2.0 Elastic fleets session script Amazon S3 bucket policy cross-service confused deputy prevention

Example aws:SourceAccount Conditional:

JSON

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Allow",
            "Principal": {
                "Service": [
                    "appstream.amazonaws.com"
                ]
            },
            "Action": "s3:GetObject",
            "Resource": "arn:aws:s3:::your-bucket-name/your-session-script-path",
            "Condition": {
                "StringEquals": {
                    "aws:SourceAccount": "your AWS account ID"
                } 
            }
        }
    ]
}

Example aws:SourceArn Conditional:

JSON

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Allow",
            "Principal": {
                "Service": [
                    "appstream.amazonaws.com"
                ]
            },
            "Action": "s3:GetObject",
            "Resource": "arn:aws:s3:::bucket/AppStream2/*",
            "Condition": {
                "ArnLike": {
                "aws:SourceArn": "arn:aws:appstream:us-east-1:111122223333:fleet/yourFleetName"
                }
            }
        }
    ]
}