SSMAccess.json

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Allow",
            "Action": [
                "ssm:DescribeSessions",
                "ssm:GetConnectionStatus",
                "ssm:DescribeInstanceProperties",
                "ec2:DescribeInstances",
                "ssm:StartSession"
            ],
            "Resource": "*"
        },
        {
            "Sid": "ReadAlltheSSMThings",
            "Effect": "Allow",
            "Action": [
                "ssm:Get*",
                "ssm:Describe*",
                "ssm:List*"
            ],
            "Resource": "*"
        },
        {
            "Sid": "SameUserTerminate",
            "Effect": "Allow",
            "Action": "ssm:TerminateSession",
            "Resource": "arn:aws:ssm:*:*:session/${aws:username}-*"
        },
        {
            "Sid": "DenySMtoProd",
            "Effect": "Deny",
            "Action": "ssm:StartSession",
            "Resource": [
                "arn:aws:ec2:*:*:instance/*"
            ],
            "Condition": {
                "StringLike": {
                    "ssm:resourceTag/Environment": "Prod"
                }
            }
        }
    ]
}