如何限制CodeCommit上的用户创建分支？

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Sid": "DenyCreateBranch",
            "Effect": "Deny",
            "Action": [
                "codecommit:CreateBranch"
            ],
            "Resource": [
                "arn:aws:codecommit:region:account-id:repository-name"
            ],
            "Condition": {
                "StringEqualsIfExists": {
                    "codecommit:References": [
                        "refs/heads/*"
                    ]
                }
            }
        }
    ]
}