analyze the cognito role to ensure it is limited by userid, and table

[gcmcnutt]

It looks like the reader is universal - so need to re-enable login on the test site -- right now, the anon creds can read all.

[gcmcnutt]

the roles are good -- basically, unauthenticated access is denied and authenticated is restricted to only reading elements from the user's principal: e.g.

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Allow",
            "Action": [
                "mobileanalytics:PutEvents",
                "cognito-sync:*",
                "cognito-identity:*"
            ],
            "Resource": [
                "*"
            ]
        },
        {
            "Sid": "Stmt1449552297000",
            "Effect": "Allow",
            "Action": [
                "dynamodb:BatchWriteItem",
                "dynamodb:UpdateItem",
                "dynamodb:Query"
            ],
            "Resource": [
                "arn:aws:dynamodb:us-east-1:499918285206:table/sensor2"
            ],
            "Condition": {
                "ForAllValues:StringEquals": {
                    "dynamodb:LeadingKeys": [
                        "${cognito-identity.amazonaws.com:sub}"
                    ]
                }
            }
        }
    ]
}