iam-policy.json

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Sid": "",
            "Effect": "Allow",
            "Action": "ssm:DescribeParameters",
            "Resource": "*"
        },
        {
            "Sid": "",
            "Effect": "Allow",
            "Action": "ssm:GetParameters",
            "Resource": [
                "arn:aws:ssm:ap-northeast-1:(AWS ACCOUT ID):parameter/app/production/*"
            ]
        },
        {
            "Sid": "",
            "Effect": "Allow",
            "Action": "kms:Decrypt",
            "Resource": [
                "arn:aws:kms:ap-northeast-1:(AWS ACCOUT ID):key/(KMS KEY ID)"
            ]
        }
    ]
}