Syntax Properties Return values Examples

AWS::Config::ConfigRule

Note

You must first create and start the Amazon Config configuration recorder in order to create Amazon Config managed rules with Amazon CloudFormation. For more information, see Managing the Configuration Recorder.

Adds or updates an Amazon Config rule to evaluate if your Amazon resources comply with your desired configurations. For information on how many Amazon Config rules you can have per account, see Service Limits in the Amazon Config Developer Guide.

There are two types of rules: Amazon Config Managed Rules and Amazon Config Custom Rules. You can use the ConfigRule resource to create both Amazon Config Managed Rules and Amazon Config Custom Rules.

Amazon Config Managed Rules are predefined, customizable rules created by Amazon Config. For a list of managed rules, see List of Amazon Config Managed Rules. If you are adding an Amazon Config managed rule, you must specify the rule's identifier for the SourceIdentifier key.

Amazon Config Custom Rules are rules that you create from scratch. There are two ways to create Amazon Config custom rules: with Lambda functions (Amazon Lambda Developer Guide) and with Guard (Guard GitHub Repository), a policy-as-code language. Amazon Config custom rules created with Amazon Lambda are called Amazon Config Custom Lambda Rules and Amazon Config custom rules created with Guard are called Amazon Config Custom Policy Rules.

If you are adding a new Amazon Config Custom Lambda rule, you first need to create an Amazon Lambda function that the rule invokes to evaluate your resources. When you use the ConfigRule resource to add a Custom Lambda rule to Amazon Config, you must specify the Amazon Resource Name (ARN) that Amazon Lambda assigns to the function. You specify the ARN in the SourceIdentifier key. This key is part of the Source object, which is part of the ConfigRule object.

For any new Amazon Config rule that you add, specify the ConfigRuleName in the ConfigRule object. Do not specify the ConfigRuleArn or the ConfigRuleId. These values are generated by Amazon Config for new rules.

If you are updating a rule that you added previously, you can specify the rule by ConfigRuleName, ConfigRuleId, or ConfigRuleArn in the ConfigRule data type that you use in this request.

For more information about developing and using Amazon Config rules, see Evaluating Resources with Amazon Config Rules in the Amazon Config Developer Guide.

Syntax

To declare this entity in your Amazon CloudFormation template, use the following syntax:

JSON


{
  "Type" : "AWS::Config::ConfigRule",
  "Properties" : {
      "Compliance" : Compliance,
      "ConfigRuleName" : String,
      "Description" : String,
      "EvaluationModes" : [ EvaluationModeConfiguration, ... ],
      "InputParameters" : Json,
      "MaximumExecutionFrequency" : String,
      "Scope" : Scope,
      "Source" : Source
    }
}

YAML


Type: AWS::Config::ConfigRule
Properties:
  Compliance: 
    Compliance
  ConfigRuleName: String
  Description: String
  EvaluationModes: 
    - EvaluationModeConfiguration
  InputParameters: Json
  MaximumExecutionFrequency: String
  Scope: 
    Scope
  Source: 
    Source

Properties

Compliance

Indicates whether an Amazon resource or Amazon Config rule is compliant and provides the number of contributors that affect the compliance.

Required: No

Type: Compliance

Update requires: No interruption

ConfigRuleName

A name for the Amazon Config rule. If you don't specify a name, Amazon CloudFormation generates a unique physical ID and uses that ID for the rule name. For more information, see Name Type.

Required: No

Type: String

Pattern: .*\S.*

Minimum: 1

Maximum: 128

Update requires: Replacement

Description

The description that you provide for the Amazon Config rule.

Required: No

Type: String

Minimum: 0

Maximum: 256

Update requires: No interruption

EvaluationModes

The modes the Amazon Config rule can be evaluated in. The valid values are distinct objects. By default, the value is Detective evaluation mode only.

Required: No

Type: Array of EvaluationModeConfiguration

Update requires: No interruption

InputParameters

A string, in JSON format, that is passed to the Amazon Config rule Lambda function.

Required: No

Type: Json

Minimum: 1

Maximum: 1024

Update requires: No interruption

MaximumExecutionFrequency

The maximum frequency with which Amazon Config runs evaluations for a rule. You can specify a value for MaximumExecutionFrequency when:

You are using an Amazon managed rule that is triggered at a periodic frequency.
Your custom rule is triggered when Amazon Config delivers the configuration snapshot. For more information, see ConfigSnapshotDeliveryProperties.

Note

By default, rules with a periodic trigger are evaluated every 24 hours. To change the frequency, specify a valid value for the MaximumExecutionFrequency parameter.

Required: No

Type: String

Allowed values: One_Hour | Six_Hours | Three_Hours | Twelve_Hours | TwentyFour_Hours

Update requires: No interruption

Scope

Defines which resources can trigger an evaluation for the rule. The scope can include one or more resource types, a combination of one resource type and one resource ID, or a combination of a tag key and value. Specify a scope to constrain the resources that can trigger an evaluation for the rule. If you do not specify a scope, evaluations are triggered when any resource in the recording group changes.

Note

The scope can be empty.

Required: No

Type: Scope

Update requires: No interruption

Source

Provides the rule owner (Amazon for managed rules, CUSTOM_POLICY for Custom Policy rules, and CUSTOM_LAMBDA for Custom Lambda rules), the rule identifier, and the notifications that cause the function to evaluate your Amazon resources.

Required: Yes

Type: Source

Update requires: No interruption

Return values

Ref

When you pass the logical ID of this resource to the intrinsic Ref function, Ref returns the rule name, such as mystack-MyConfigRule-12ABCFPXHV4OV.

For more information about using the Ref function, see Ref.

Fn::GetAtt

The Fn::GetAtt intrinsic function returns a value for a specified attribute of this type. The following are the available attributes and sample return values.

For more information about using the Fn::GetAtt intrinsic function, see Fn::GetAtt.

Arn: The Amazon Resource Name (ARN) of the Amazon Config rule, such as arn:aws:config:us-east-1:123456789012:config-rule/config-rule-a1bzhi.
ConfigRuleId: The ID of the Amazon Config rule, such as config-rule-a1bzhi.
Type: Property description not available.

Examples

Config Rule

The following example uses an Amazon managed rule that checks whether EC2 volumes resource types have a CostCenter tag.

JSON


"ConfigRuleForVolumeTags": {
  "Type": "AWS::Config::ConfigRule",
  "Properties": {
    "InputParameters": {"tag1Key": "CostCenter"},
    "Scope": {
      "ComplianceResourceTypes": ["AWS::EC2::Volume"]
    },
    "Source": {
      "Owner": "AWS",
      "SourceIdentifier": "REQUIRED_TAGS"
    }
  }
}

YAML


ConfigRuleForVolumeTags: 
  Type: AWS::Config::ConfigRule
  Properties: 
    InputParameters: |
        {"tag1Key": "CostCenter"}
    Scope: 
      ComplianceResourceTypes: 
        - "AWS::EC2::Volume"
    Source: 
      Owner: AWS
      SourceIdentifier: "REQUIRED_TAGS"

Create Rule Using Lambda Function

The following example creates a custom configuration rule that uses a Lambda function. The function checks whether an EC2 volume has the AutoEnableIO property set to true. Note that the configuration rule has a dependency on the Lambda policy so that the rule calls the function only after it's permitted to do so.

After you create a rule using Lambda it is recommended you update the permissions based on the Update Rule Using Lambda Function with SourceArn based permission example which restricts only a specific rule ARN to invoke the Lambda function. This helps make sure Amazon Lambda is accessing your resources on behalf of expected users and scenarios only.

JSON


"ConfigPermissionToCallLambda": {
    "Type": "AWS::Lambda::Permission",
    "Properties": {
        "FunctionName": {"Fn::GetAtt": ["VolumeAutoEnableIOComplianceCheck", "Arn"]},
        "Action": "lambda:InvokeFunction",
        "Principal": "config.amazonaws.com",
        "SourceAccount": {"Ref": "AWS::AccountId" }
    }
},
"VolumeAutoEnableIOComplianceCheck": {
  "Type": "AWS::Lambda::Function",
  "Properties": {
    "Code": {
      "ZipFile":  {"Fn::Join": ["\n", [
        "var aws  = require('aws-sdk');",
        "var config = new aws.ConfigService();",
        "var ec2 = new aws.EC2();",

        "exports.handler = function(event, context) {",
        "    compliance = evaluateCompliance(event, function(compliance, event) {",
        "        var configurationItem = JSON.parse(event.invokingEvent).configurationItem;",

        "        var putEvaluationsRequest = {",
        "            Evaluations: [{",
        "                ComplianceResourceType: configurationItem.resourceType,",
        "                ComplianceResourceId: configurationItem.resourceId,",
        "                ComplianceType: compliance,",
        "                OrderingTimestamp: configurationItem.configurationItemCaptureTime",
        "            }],",
        "            ResultToken: event.resultToken",
        "        };",

        "        config.putEvaluations(putEvaluationsRequest, function(err, data) {",
        "            if (err) context.fail(err);",
        "            else context.succeed(data);",
        "        });",
        "    });",
        "};",

        "function evaluateCompliance(event, doReturn) {",
        "    var configurationItem = JSON.parse(event.invokingEvent).configurationItem;",
        "    var status = configurationItem.configurationItemStatus;",
        "    if (configurationItem.resourceType !== 'AWS::EC2::Volume' || event.eventLeftScope || (status !== 'OK' && status !== 'ResourceDiscovered'))",
        "        doReturn('NOT_APPLICABLE', event);",
        "    else ec2.describeVolumeAttribute({VolumeId: configurationItem.resourceId, Attribute: 'autoEnableIO'}, function(err, data) {",
        "        if (err) context.fail(err);",
        "        else if (data.AutoEnableIO.Value) doReturn('COMPLIANT', event);",
        "        else doReturn('NON_COMPLIANT', event);",
        "    });",
        "}"
      ]]}
    },
    "Handler": "index.handler",
    "Runtime": "nodejs12.x",
    "Timeout": "30",
    "Role": {"Fn::GetAtt": ["LambdaExecutionRole", "Arn"]}
  }
},
"ConfigRuleForVolumeAutoEnableIO": {
  "Type": "AWS::Config::ConfigRule",
  "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"]}
    }
  },
  "DependsOn": "ConfigPermissionToCallLambda"
}

YAML


ConfigPermissionToCallLambda: 
  Type: AWS::Lambda::Permission
  Properties: 
    FunctionName: 
       Fn::GetAtt: 
        - VolumeAutoEnableIOComplianceCheck
        - Arn
    Action: "lambda:InvokeFunction"
    Principal: "config.amazonaws.com"
    SourceAccount: !Ref 'AWS::AccountId'
VolumeAutoEnableIOComplianceCheck: 
  Type: AWS::Lambda::Function
  Properties: 
    Code: 
      ZipFile: 
        !Sub |
          var aws  = require('aws-sdk');
          var config = new aws.ConfigService();
          var ec2 = new aws.EC2();
          exports.handler = function(event, context) {
              compliance = evaluateCompliance(event, function(compliance, event) {
                    var configurationItem = JSON.parse(event.invokingEvent).configurationItem;
                    var putEvaluationsRequest = {
                        Evaluations: [{
                            ComplianceResourceType: configurationItem.resourceType,
                            ComplianceResourceId: configurationItem.resourceId,
                            ComplianceType: compliance,
                            OrderingTimestamp: configurationItem.configurationItemCaptureTime
                        }],
                        ResultToken: event.resultToken
                    };
                    config.putEvaluations(putEvaluationsRequest, function(err, data) {
                        if (err) context.fail(err);
                        else context.succeed(data);
                    });
                });
            };
            function evaluateCompliance(event, doReturn) {
                var configurationItem = JSON.parse(event.invokingEvent).configurationItem;
                var status = configurationItem.configurationItemStatus;
                if (configurationItem.resourceType !== 'AWS::EC2::Volume' || event.eventLeftScope || (status !== 'OK' && status !== 'ResourceDiscovered'))
                    doReturn('NOT_APPLICABLE', event);
                else ec2.describeVolumeAttribute({VolumeId: configurationItem.resourceId, Attribute: 'autoEnableIO'}, function(err, data) {
                    if (err) context.fail(err);
                    else if (data.AutoEnableIO.Value) doReturn('COMPLIANT', event);
                    else doReturn('NON_COMPLIANT', event);
                });
            }
    Handler: "index.handler"
    Runtime: nodejs12.x
    Timeout: 30
    Role: 
      Fn::GetAtt: 
        - LambdaExecutionRole
        - Arn
ConfigRuleForVolumeAutoEnableIO: 
  Type: AWS::Config::ConfigRule
  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
  DependsOn: ConfigPermissionToCallLambda

Update Rule Using Lambda Function with SourceArn based permission

After an Amazon Config rule has been created, there is a sourceARN which is the ARN of the Amazon Config rule that is invoking the Lambda function. The following example includes sourceARN based permission to restrict only a specific rule ARN to invoke the Lambda function. It is recommended after you create a rule that you update with these more restrictive permissions to help make sure Amazon Lambda is accessing your resources on behalf of expected users and scenarios only.

JSON


"ConfigPermissionToCallLambda": {
    "Type": "AWS::Lambda::Permission",
    "Properties": {
        "FunctionName": {"Fn::GetAtt": ["VolumeAutoEnableIOComplianceCheck", "Arn"]},
        "Action": "lambda:InvokeFunction",
        "Principal": "config.amazonaws.com",
        "SourceAccount": {"Ref": "AWS::AccountId" },
        "SourceArn": {"Fn::GetAtt": [ "ConfigRuleForVolumeAutoEnableIO", "Arn" ] }
    }
},
"VolumeAutoEnableIOComplianceCheck": {
    "Type": "AWS::Lambda::Function",
    "Properties": {
        "Code": {
            "ZipFile":  {"Fn::Join": ["\n", [
               "var aws  = require('aws-sdk');",
               "var config = new aws.ConfigService();",
               "var ec2 = new aws.EC2();",
               
               "exports.handler = function(event, context) {",
               "    compliance = evaluateCompliance(event, function(compliance, event) {",
               "        var configurationItem = JSON.parse(event.invokingEvent).configurationItem;",
               
               "        var putEvaluationsRequest = {",
               "            Evaluations: [{",
               "                ComplianceResourceType: configurationItem.resourceType,",
               "                ComplianceResourceId: configurationItem.resourceId,",
               "                ComplianceType: compliance,",
               "                OrderingTimestamp: configurationItem.configurationItemCaptureTime",
               "            }],",
               "            ResultToken: event.resultToken",
               "        };",
               
               "        config.putEvaluations(putEvaluationsRequest, function(err, data) {",
               "            if (err) context.fail(err);",
               "            else context.succeed(data);",
               "        });",
               "    });",
               "};",
               
               "function evaluateCompliance(event, doReturn) {",
               "    var configurationItem = JSON.parse(event.invokingEvent).configurationItem;",
               "    var status = configurationItem.configurationItemStatus;",
               "    if (configurationItem.resourceType !== 'AWS::EC2::Volume' || event.eventLeftScope || (status !== 'OK' && status !== 'ResourceDiscovered'))",
               "        doReturn('NOT_APPLICABLE', event);",
               "    else ec2.describeVolumeAttribute({VolumeId: configurationItem.resourceId, Attribute: 'autoEnableIO'}, function(err, data) {",
               "        if (err) context.fail(err);",
               "        else if (data.AutoEnableIO.Value) doReturn('COMPLIANT', event);",
               "        else doReturn('NON_COMPLIANT', event);",
               "    });",
               "}"
               ]]}
               },
            "Handler": "index.handler",
            "Runtime": "nodejs12.x",
            "Timeout": "30",
            "Role": {"Fn::GetAtt": ["LambdaExecutionRole", "Arn"]}
    }
},
"ConfigRuleForVolumeAutoEnableIO": {
    "Type": "AWS::Config::ConfigRule",
    "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"]}
          }
     },
     "DependsOn": "ConfigPermissionToCallLambda"
}

YAML


ConfigPermissionToCallLambda: 
    Type: AWS::Lambda::Permission
    Properties: 
      FunctionName: 
        Fn::GetAtt: 
           - VolumeAutoEnableIOComplianceCheck
           - Arn
      Action: "lambda:InvokeFunction"
      Principal: "config.amazonaws.com"
      SourceAccount: !Ref 'AWS::AccountId'
      SourceArn:
        Fn::GetAtt: 
           - VolumeAutoEnableIOComplianceCheck
           - Arn
VolumeAutoEnableIOComplianceCheck: 
    Type: AWS::Lambda::Function
    Properties: 
      Code: 
        ZipFile: 
           !Sub |
             var aws  = require('aws-sdk');
             var config = new aws.ConfigService();
             var ec2 = new aws.EC2();
             exports.handler = function(event, context) {
                compliance = evaluateCompliance(event, function(compliance, event) {
                    var configurationItem = JSON.parse(event.invokingEvent).configurationItem;
                    var putEvaluationsRequest = {
                        Evaluations: [{
                            ComplianceResourceType: configurationItem.resourceType,
                            ComplianceResourceId: configurationItem.resourceId,
                            ComplianceType: compliance,
                            OrderingTimestamp: configurationItem.configurationItemCaptureTime
                         }],
                         ResultToken: event.resultToken
                    };
                    config.putEvaluations(putEvaluationsRequest, function(err, data) {
                        if (err) context.fail(err);
                        else context.succeed(data);
                    });
                 });
               };
               function evaluateCompliance(event, doReturn) {
                  var configurationItem = JSON.parse(event.invokingEvent).configurationItem;
                  var status = configurationItem.configurationItemStatus;
               if (configurationItem.resourceType !== 'AWS::EC2::Volume' || event.eventLeftScope || (status !== 'OK' && status !== 'ResourceDiscovered'))
                    doReturn('NOT_APPLICABLE', event);
               else ec2.describeVolumeAttribute({VolumeId: configurationItem.resourceId, Attribute: 'autoEnableIO'}, function(err, data) {
                    if (err) context.fail(err);
                    else if (data.AutoEnableIO.Value) doReturn('COMPLIANT', event);
                    else doReturn('NON_COMPLIANT', event);
                  });
               }
      Handler: "index.handler"
      Runtime: nodejs12.x
      Timeout: 30
      Role: 
        Fn::GetAtt: 
           - LambdaExecutionRole
           - Arn
ConfigRuleForVolumeAutoEnableIO: 
    Type: AWS::Config::ConfigRule
    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
     DependsOn: ConfigPermissionToCallLambda

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Tag

Compliance