AWSTemplateFormatVersion: "2010-09-09"
Description: ""
Resources:
  SnsTopicMetricFilterCloudWatchAlarm:
    Type: "AWS::SNS::Topic"
    Properties:
      Subscription:
        - Endpoint: "email@example.com"
          Protocol: "email"
      TopicName: "alarm-action"
  CloudWatchAlarm:
    Type: "AWS::CloudWatch::Alarm"
    Properties:
      AlarmName: "iam_policy_changes"
      AlarmDescription: "A CloudWatch Alarm that triggers when changes are made to IAM policies. Events include IAM policy creation/deletion/update operations as well as attaching/detaching policies from IAM users, roles or groups."
      MetricName: "IAMPolicyEventCount"
      Namespace: "CloudTrailMetrics"
      Statistic: "Sum"
      Period: "300"
      EvaluationPeriods: "1"
      Threshold: "1"
      ComparisonOperator: "GreaterThanOrEqualToThreshold"
      AlarmActions:
        - Ref: "SnsTopicMetricFilterCloudWatchAlarm"
      TreatMissingData: "notBreaching"
  MetricFilterCloudWatchAlarm:
    Type: "AWS::Logs::MetricFilter"
    Properties:
      LogGroupName: ""
      FilterPattern: "{($.eventName=DeleteGroupPolicy)||($.eventName=DeleteRolePolicy)||($.eventName=DeleteUserPolicy)||($.eventName=PutGroupPolicy)||($.eventName=PutRolePolicy)||($.eventName=PutUserPolicy)||($.eventName=CreatePolicy)||($.eventName=DeletePolicy)||($.eventName=CreatePolicyVersion)||($.eventName=DeletePolicyVersion)||($.eventName=AttachRolePolicy)||($.eventName=DetachRolePolicy)||($.eventName=AttachUserPolicy)||($.eventName=DetachUserPolicy)||($.eventName=AttachGroupPolicy)||($.eventName=DetachGroupPolicy)}"
      MetricTransformations:
        - MetricValue: "1"
          MetricNamespace: "CloudTrailMetrics"
          MetricName: "IAMPolicyEventCount"
Parameters: {}
Metadata: {}
Conditions: {}