{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Sid": "DenyAllAwsResourcesOutsideAccountExceptSNS",
      "Effect": "Deny",
      "NotAction": [
        "sns:*"
      ],
      "Resource": "*",
      "Condition": {
        "StringNotEquals": {
          "aws:ResourceAccount": [
            "111122223333"
          ]
        }
      }
    },
    {
      "Sid": "DenyAllSNSResourcesOutsideAccountExceptCloudFormation",
      "Effect": "Deny",
      "Action": [
        "sns:*"
      ],
      "Resource": "*",
      "Condition": {
        "StringNotEquals": {
          "aws:ResourceAccount": [
            "111122223333"
          ]
        },
        "ForAllValues:StringNotEquals": {
          "aws:CalledVia": [
            "cloudformation.amazonaws.com"
          ]
        }
      }
    }
  ]
}