Question

How would you enforce Multi-Factor Authentication (MFA) for IAM users?

Answer 1

Enforcing MFA can be done by creating an IAM policy that requires MFA and attaching it to the users or roles. Here’s an example of such a policy:

Example Policy JSON:

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Deny",
      "Action": "*",
      "Resource": "*",
      "Condition": {
        "BoolIfExists": {
          "aws:MultiFactorAuthPresent": "false"
        }
      }
    }
  ]
}