{
    "AWSTemplateFormatVersion": "2010-09-09",
    "Description": "AWS CloudFormation Sample Template Config: This template demonstrates the usage of AWS Config resources. **WARNING** You will be billed for the AWS resources used if you create a stack from this template.",
    "Metadata": {
        "License": "Apache-2.0"
    },
    "Parameters": {
        "DeliveryChannelExists": {
            "Description": "Do you have an exisiting AWS Config delivery channel?",
            "Type": "String",
            "AllowedValues": [
                "false",
                "true"
            ],
            "Default": "false"
        },
        "Ec2VolumeAutoEnableIO": {
            "Type": "String",
            "AllowedValues": [
                "false",
                "true"
            ],
            "Default": "false"
        },
        "Ec2VolumeTagKey": {
            "Type": "String",
            "Default": "CostCenter"
        }
    },
    "Conditions": {
        "CreateDeliveryChannel": {
            "Fn::Equals": [
                {
                    "Ref": "DeliveryChannelExists"
                },
                "false"
            ]
        }
    },
    "Resources": {
        "Ec2Volume": {
            "Type": "AWS::EC2::Volume",
            "Metadata": {
                "guard": {
                    "SuppressedRules": [
                        "EC2_EBS_ENCRYPTION_BY_DEFAULT",
                        "ENCRYPTED_VOLUMES"
                    ]
                }
            },
            "Properties": {
                "AutoEnableIO": {
                    "Ref": "Ec2VolumeAutoEnableIO"
                },
                "Size": "5",
                "AvailabilityZone": {
                    "Fn::Select": [
                        0,
                        {
                            "Fn::GetAZs": null
                        }
                    ]
                },
                "Tags": [
                    {
                        "Key": {
                            "Ref": "Ec2VolumeTagKey"
                        },
                        "Value": "Ec2VolumeTagValue"
                    }
                ]
            }
        },
        "ConfigRecorder": {
            "Type": "AWS::Config::ConfigurationRecorder",
            "Properties": {
                "Name": "default",
                "RecordingGroup": {
                    "ResourceTypes": [
                        "AWS::EC2::Volume"
                    ]
                },
                "RoleARN": {
                    "Fn::GetAtt": [
                        "ConfigRole",
                        "Arn"
                    ]
                }
            }
        },
        "DeliveryChannel": {
            "Type": "AWS::Config::DeliveryChannel",
            "Properties": {
                "ConfigSnapshotDeliveryProperties": {
                    "DeliveryFrequency": "Six_Hours"
                },
                "S3BucketName": {
                    "Ref": "ConfigBucket"
                },
                "SnsTopicARN": {
                    "Ref": "ConfigTopic"
                }
            },
            "Condition": "CreateDeliveryChannel"
        },
        "ConfigBucket": {
            "Type": "AWS::S3::Bucket",
            "Metadata": {
                "guard": {
                    "SuppressedRules": [
                        "S3_BUCKET_DEFAULT_LOCK_ENABLED",
                        "S3_BUCKET_VERSIONING_ENABLED",
                        "S3_BUCKET_REPLICATION_ENABLED",
                        "S3_BUCKET_LOGGING_ENABLED"
                    ]
                }
            },
            "Properties": {
                "BucketEncryption": {
                    "ServerSideEncryptionConfiguration": [
                        {
                            "ServerSideEncryptionByDefault": {
                                "SSEAlgorithm": "AES256"
                            }
                        }
                    ]
                },
                "PublicAccessBlockConfiguration": {
                    "BlockPublicAcls": true,
                    "BlockPublicPolicy": true,
                    "IgnorePublicAcls": true,
                    "RestrictPublicBuckets": true
                }
            }
        },
        "ConfigTopic": {
            "Type": "AWS::SNS::Topic"
        },
        "ConfigTopicPolicy": {
            "Type": "AWS::SNS::TopicPolicy",
            "Properties": {
                "PolicyDocument": {
                    "Id": "ConfigTopicPolicy",
                    "Version": "2012-10-17",
                    "Statement": [
                        {
                            "Effect": "Allow",
                            "Principal": {
                                "Service": "config.amazonaws.com"
                            },
                            "Action": "SNS:Publish",
                            "Resource": "*"
                        }
                    ]
                },
                "Topics": [
                    {
                        "Ref": "ConfigTopic"
                    }
                ]
            }
        },
        "ConfigRuleForVolumeTags": {
            "Type": "AWS::Config::ConfigRule",
            "DependsOn": "ConfigRecorder",
            "Properties": {
                "InputParameters": {
                    "tag1Key": "CostCenter"
                },
                "Scope": {
                    "ComplianceResourceTypes": [
                        "AWS::EC2::Volume"
                    ]
                },
                "Source": {
                    "Owner": "AWS",
                    "SourceIdentifier": "REQUIRED_TAGS"
                }
            }
        },
        "ConfigRuleForVolumeAutoEnableIO": {
            "Type": "AWS::Config::ConfigRule",
            "DependsOn": [
                "ConfigPermissionToCallLambda",
                "ConfigRecorder"
            ],
            "Properties": {
                "ConfigRuleName": "ConfigRuleForVolumeAutoEnableIO",
                "Scope": {
                    "ComplianceResourceId": {
                        "Ref": "Ec2Volume"
                    },
                    "ComplianceResourceTypes": [
                        "AWS::EC2::Volume"
                    ]
                },
                "Source": {
                    "Owner": "CUSTOM_LAMBDA",
                    "SourceDetails": [
                        {
                            "EventSource": "aws.config",
                            "MessageType": "ConfigurationItemChangeNotification"
                        }
                    ],
                    "SourceIdentifier": {
                        "Fn::GetAtt": [
                            "VolumeAutoEnableIOComplianceCheck",
                            "Arn"
                        ]
                    }
                }
            }
        },
        "ConfigPermissionToCallLambda": {
            "Type": "AWS::Lambda::Permission",
            "Metadata": {
                "guard": {
                    "SuppressedRules": [
                        "LAMBDA_FUNCTION_PUBLIC_ACCESS_PROHIBITED"
                    ]
                }
            },
            "Properties": {
                "FunctionName": {
                    "Fn::GetAtt": [
                        "VolumeAutoEnableIOComplianceCheck",
                        "Arn"
                    ]
                },
                "Action": "lambda:InvokeFunction",
                "Principal": "config.amazonaws.com"
            }
        },
        "VolumeAutoEnableIOComplianceCheck": {
            "Type": "AWS::Lambda::Function",
            "Metadata": {
                "guard": {
                    "SuppressedRules": [
                        "LAMBDA_INSIDE_VPC"
                    ]
                }
            },
            "Properties": {
                "Code": {
                    "ZipFile": "var aws  = require('aws-sdk');\nvar config = new aws.ConfigService();\nvar ec2 = new aws.EC2();\nexports.handler = function(event, context) {\n    var compliance = evaluateCompliance(event, function(compliance, event) {\n        var configurationItem = JSON.parse(event.invokingEvent).configurationItem;\n        var putEvaluationsRequest = {\n            Evaluations: [{\n                ComplianceResourceType: configurationItem.resourceType,\n                ComplianceResourceId: configurationItem.resourceId,\n                ComplianceType: compliance,\n                OrderingTimestamp: configurationItem.configurationItemCaptureTime\n            }],\n            ResultToken: event.resultToken\n        };\n        config.putEvaluations(putEvaluationsRequest, function(err, data) {\n            if (err) context.fail(err);\n            else context.succeed(data);\n        });\n    });\n};\nfunction evaluateCompliance(event, doReturn) {\n    var configurationItem = JSON.parse(event.invokingEvent).configurationItem;\n    var status = configurationItem.configurationItemStatus;\n    if (configurationItem.resourceType !== 'AWS::EC2::Volume' || event.eventLeftScope || (status !== 'OK' && status !== 'ResourceDiscovered'))\n        doReturn('NOT_APPLICABLE', event);\n    else ec2.describeVolumeAttribute({VolumeId: configurationItem.resourceId, Attribute: 'autoEnableIO'}, function(err, data) {\n        if (err) context.fail(err);\n        else if (data.AutoEnableIO.Value) doReturn('COMPLIANT', event);\n        else doReturn('NON_COMPLIANT', event);\n    });\n}\n"
                },
                "Handler": "index.handler",
                "Runtime": "nodejs20.x",
                "Timeout": "30",
                "Role": {
                    "Fn::GetAtt": [
                        "LambdaExecutionRole",
                        "Arn"
                    ]
                }
            }
        },
        "LambdaExecutionRole": {
            "Type": "AWS::IAM::Role",
            "Properties": {
                "AssumeRolePolicyDocument": {
                    "Version": "2012-10-17",
                    "Statement": [
                        {
                            "Effect": "Allow",
                            "Principal": {
                                "Service": [
                                    "lambda.amazonaws.com"
                                ]
                            },
                            "Action": [
                                "sts:AssumeRole"
                            ]
                        }
                    ]
                },
                "Policies": [
                    {
                        "PolicyName": "root",
                        "PolicyDocument": {
                            "Version": "2012-10-17",
                            "Statement": [
                                {
                                    "Effect": "Allow",
                                    "Action": [
                                        "logs:*",
                                        "config:PutEvaluations",
                                        "ec2:DescribeVolumeAttribute"
                                    ],
                                    "Resource": "*"
                                }
                            ]
                        }
                    }
                ]
            }
        },
        "ConfigRole": {
            "Type": "AWS::IAM::Role",
            "Properties": {
                "AssumeRolePolicyDocument": {
                    "Version": "2012-10-17",
                    "Statement": [
                        {
                            "Effect": "Allow",
                            "Principal": {
                                "Service": [
                                    "config.amazonaws.com"
                                ]
                            },
                            "Action": [
                                "sts:AssumeRole"
                            ]
                        }
                    ]
                },
                "ManagedPolicyArns": [
                    "arn:aws:iam::aws:policy/service-role/AWS_ConfigRole"
                ],
                "Policies": [
                    {
                        "PolicyName": "root",
                        "PolicyDocument": {
                            "Version": "2012-10-17",
                            "Statement": [
                                {
                                    "Effect": "Allow",
                                    "Action": "s3:GetBucketAcl",
                                    "Resource": {
                                        "Fn::Join": [
                                            "",
                                            [
                                                "arn:aws:s3:::",
                                                {
                                                    "Ref": "ConfigBucket"
                                                }
                                            ]
                                        ]
                                    }
                                },
                                {
                                    "Effect": "Allow",
                                    "Action": "s3:PutObject",
                                    "Resource": {
                                        "Fn::Join": [
                                            "",
                                            [
                                                "arn:aws:s3:::",
                                                {
                                                    "Ref": "ConfigBucket"
                                                },
                                                "/AWSLogs/",
                                                {
                                                    "Ref": "AWS::AccountId"
                                                },
                                                "/*"
                                            ]
                                        ]
                                    },
                                    "Condition": {
                                        "StringEquals": {
                                            "s3:x-amz-acl": "bucket-owner-full-control"
                                        }
                                    }
                                },
                                {
                                    "Effect": "Allow",
                                    "Action": "config:Put*",
                                    "Resource": "*"
                                }
                            ]
                        }
                    }
                ]
            }
        }
    },
    "Outputs": {
        "ConfigRuleForVolumeTagsArn": {
            "Value": {
                "Fn::GetAtt": [
                    "ConfigRuleForVolumeTags",
                    "Arn"
                ]
            }
        },
        "ConfigRuleForVolumeTagsConfigRuleId": {
            "Value": {
                "Fn::GetAtt": [
                    "ConfigRuleForVolumeTags",
                    "ConfigRuleId"
                ]
            }
        },
        "ConfigRuleForVolumeAutoEnableIOComplianceType": {
            "Value": {
                "Fn::GetAtt": [
                    "ConfigRuleForVolumeAutoEnableIO",
                    "Compliance.Type"
                ]
            }
        }
    }
}