スイッチロールユーザーに対して期間限定&MFA利用でのアクセスを許可する。 ref: https://qiita.com/kooohei/items/dc214263ca4af90f9991

IAMポリシー

{
    "Version": "2012-10-17",
    "Statement": {
        "Effect": "Allow",
        "Action": [
            "*"
        ],
        "Resource": "*",
        "Condition": {
            "DateGreaterThan": {"aws:CurrentTime": "2018-10-01T00:00:00Z"},
            "DateLessThan": {"aws:CurrentTime": "2018-12-31T23:59:59Z"}
        }
    }
}

IAMポリシー(MFAあり)

{
    "Version": "2012-10-17",
    "Statement": {
        "Effect": "Allow",
        "Action": [
            "*"
        ],
        "Resource": "*",
        "Condition": {
            "Bool": {"aws:MultiFactorAuthPresent": true},
            "DateGreaterThan": {"aws:CurrentTime": "2018-10-01T00:00:00Z"},
            "DateLessThan": {"aws:CurrentTime": "2018-12-31T23:59:59Z"}
        }
    }
}