├── .gitignore ├── module ├── AWS Custom Config Rules.template ├── lambda.tf ├── variables.tf ├── cloudformation.tf ├── AWS Config Base.template └── iam.tf ├── package-rule-lambda-functions.ps1 ├── README.md └── LICENSE /.gitignore: -------------------------------------------------------------------------------- 1 | *.tfstate 2 | *.tfstate.backup 3 | *.log 4 | *.zip 5 | .terraform 6 | temp -------------------------------------------------------------------------------- /module/AWS Custom Config Rules.template: -------------------------------------------------------------------------------- 1 | { 2 | "AWSTemplateFormatVersion": "2010-09-09", 3 | "Resources": { 4 | "CustomConfigRule": { 5 | "Type": "AWS::Config::ConfigRule", 6 | "Properties": { 7 | "ConfigRuleName": "${config_rule_name}", 8 | "Source": { 9 | "Owner": "CUSTOM_LAMBDA", 10 | "SourceIdentifier": "${lambda_arn}", 11 | "SourceDetails": [{ 12 | "EventSource": "aws.config", 13 | "MessageType": "${message_type}" 14 | }] 15 | }, 16 | "InputParameters": ${parameters}, 17 | "Scope": ${scope} 18 | } 19 | } 20 | } 21 | } 22 | -------------------------------------------------------------------------------- /module/lambda.tf: -------------------------------------------------------------------------------- 1 | resource "aws_lambda_function" "config_rules_lambda" { 2 | count = "${var.num_custom_rules}" 3 | filename = "${var.zip_folder}${element(replace(split(\";\",var.custom_rules), "/[\\r\\n\\s]+/",""), count.index)}.zip" 4 | function_name = "${var.naming_prefix}-rule-${replace(element(split(\";\",var.custom_rules), count.index),"/(^[^a-zA-Z]{1,1}|[^-a-zA-Z0-9_]+)/","")}" 5 | role = "${aws_iam_role.iam_for_lambda.arn}" 6 | handler = "${element(replace(split(\";\",var.custom_rules), "/[\\r\\n\\s]+/",""), count.index)}.${lookup(var.lambda_language_map,element(split(\";\",var.custom_rule_languages), count.index))}" 7 | runtime = "${element(split(\";\",var.custom_rule_languages), count.index)}" 8 | timeout = 300 9 | source_code_hash = "${base64sha256(file("${var.zip_folder}${element(replace(split(\";\",var.custom_rules), "/[\\r\\n\\s]+/",""), count.index)}.zip"))}" 10 | } 11 | 12 | resource "aws_lambda_permission" "allow_aws_config" { 13 | count = "${var.num_custom_rules}" 14 | statement_id = "AllowExecutionFromAWSConfig" 15 | action = "lambda:InvokeFunction" 16 | function_name = "${element(aws_lambda_function.config_rules_lambda.*.function_name, count.index)}" 17 | principal = "config.amazonaws.com" 18 | depends_on = ["aws_lambda_function.config_rules_lambda"] 19 | } 20 | -------------------------------------------------------------------------------- /package-rule-lambda-functions.ps1: -------------------------------------------------------------------------------- 1 | #Requires -Version 5 2 | 3 | # Define the custom rules 4 | $CustomRules = @( 5 | @{lang="nodejs";uri="https://raw.githubusercontent.com/awslabs/aws-config-rules/master/old-periodic/cloudtrail_enabled_all_regions-periodic.js"}, 6 | @{lang="nodejs";uri="https://raw.githubusercontent.com/awslabs/aws-config-rules/master/old-periodic/iam_mfa_require_root-periodic.js"} 7 | @{lang="nodejs";uri="https://raw.githubusercontent.com/awslabs/aws-config-rules/master/old-periodic/iam_password_minimum_length-periodic.js"} 8 | @{lang="python2.7";uri="https://raw.githubusercontent.com/awslabs/aws-config-rules/master/python/ec2-exposed-instance.py"} 9 | ) 10 | 11 | # Prepare directory 12 | $CurFolder = Split-Path -parent $PSCommandPath 13 | $TempRoot = "$CurFolder\temp" 14 | New-Item $TempRoot -ItemType Directory -ErrorAction SilentlyContinue | Out-Null 15 | 16 | # Loop through the custom rules to download and package them 17 | foreach($CustomRule in $CustomRules){ 18 | 19 | $FileName = (Split-Path $CustomRule.uri -Leaf) -replace '\s+','' 20 | $ZipName = $FileName -replace '\.\w*$',".zip" 21 | 22 | # Cleanup 23 | Remove-Item "$TempRoot\$ZipName" -Force -ErrorAction SilentlyContinue 24 | 25 | # Download & Zip 26 | Invoke-WebRequest -Uri $CustomRule.uri -OutFile "$TempRoot\$FileName" 27 | Compress-Archive -DestinationPath "$TempRoot\$ZipName" -Path "$TempRoot\$FileName" 28 | } 29 | -------------------------------------------------------------------------------- /module/variables.tf: -------------------------------------------------------------------------------- 1 | variable "region" { 2 | type = "string" 3 | default = "us-west-2" 4 | } 5 | 6 | variable "naming_prefix" { 7 | type = "string" 8 | default = "aws-config" 9 | } 10 | 11 | variable "lambda_language_map" { 12 | type = "map" 13 | 14 | default = { 15 | "python2.7" = "lambda_handler" 16 | "nodejs" = "handler" 17 | } 18 | } 19 | 20 | variable "zip_folder" { 21 | default = "temp/" 22 | } 23 | 24 | variable "num_custom_rules" { 25 | default = 3 26 | } 27 | 28 | variable "custom_rules" { 29 | default = < 0){", 85 | " // successful response", 86 | " var configurationRecorders = data", 87 | " console.log('Found Configuration Recoder: ' + configurationRecorders.ConfigurationRecorders[0].name);", 88 | " console.log('Checking for the existence of a Delivery Channel')", 89 | " configservice.describeDeliveryChannels(null, function(err, data) {", 90 | " if (err) console.log(err, err.stack); // an error occurred", 91 | " else{", 92 | " if(data.DeliveryChannels.length > 0){", 93 | " console.log('There is a Delivery Channel, let\\'s delete it!')", 94 | " deliveryChannels = data", 95 | " console.log('Making sure the Delivery Recorder is stopped')", 96 | " var params = { ConfigurationRecorderName: configurationRecorders.ConfigurationRecorders[0].name};", 97 | " configservice.stopConfigurationRecorder(params, function(err, data) {", 98 | " if (err) console.log(err, err.stack); // an error occurred", 99 | " else{", 100 | " console.log('Deleting Delivery Channel')", 101 | " params = { DeliveryChannelName: deliveryChannels.DeliveryChannels[0].name }", 102 | " configservice.deleteDeliveryChannel(params, function(err, data) {", 103 | " if (err) console.log(err, err.stack); // an error occurred", 104 | " else console.log('Successfully deleted Delivery Channel') // successful response", 105 | " });", 106 | " } ", 107 | " }); ", 108 | " }else{", 109 | " console.log('No Delivery Channel to Delete')", 110 | " }", 111 | " }", 112 | " })", 113 | " ", 114 | " console.log('Setting the Configuration Recorder\\'s IAM role to the one created by our CFN stack: ' + event.ResourceProperties.RoleARN)", 115 | " var params = {", 116 | " ConfigurationRecorder: {", 117 | " name: configurationRecorders.ConfigurationRecorders[0].name,", 118 | " recordingGroup: configurationRecorders.ConfigurationRecorders[0].recordingGroup,", 119 | " roleARN: event.ResourceProperties.RoleARN", 120 | " }", 121 | " };", 122 | " configservice.putConfigurationRecorder(params, function(err, data) {", 123 | " if (err) console.log(err, err.stack); // an error occurred", 124 | " else console.log('Successfull set the Configuration Recorder\\'s IAM role to the one created by our CFN stack'); // successful response", 125 | " });", 126 | " ", 127 | " // Return the name of the configuration recorder as one exists", 128 | " response.send(event, context, response.SUCCESS, {'ConfigurationRecorder':configurationRecorders.ConfigurationRecorders[0].name});", 129 | " }else{", 130 | " console.log('No Configuration Records exist, returning default recorder name')", 131 | " response.send(event, context, response.SUCCESS, {'ConfigurationRecorder':'ConfigurationRecorder'});", 132 | " }", 133 | " } ", 134 | " });", 135 | "};" 136 | ] 137 | ] 138 | } 139 | }, 140 | "Handler": "index.handler", 141 | "Runtime": "nodejs", 142 | "Timeout": "30", 143 | "Role": { 144 | "Fn::GetAtt": [ 145 | "LambdaExecutionRole", 146 | "Arn" 147 | ] 148 | } 149 | } 150 | }, 151 | "ConfigurationRecorderSanitisationResults": { 152 | "Type": "Custom::ConfigurationRecorderSanitisationResults", 153 | "Properties": { 154 | "ServiceToken": { 155 | "Fn::GetAtt": [ 156 | "ConfigurationRecorderSanitiser", 157 | "Arn" 158 | ] 159 | }, 160 | "RoleARN": "${aws_config_role_arn}" 161 | } 162 | }, 163 | 164 | "ConfigurationRecorder": { 165 | "Type": "AWS::Config::ConfigurationRecorder", 166 | "Properties": { 167 | "Name": { 168 | "Fn::GetAtt": [ 169 | "ConfigurationRecorderSanitisationResults", 170 | "ConfigurationRecorder" 171 | ] 172 | }, 173 | "RecordingGroup": { 174 | "AllSupported": true, 175 | "IncludeGlobalResourceTypes": true 176 | }, 177 | "RoleARN":"${aws_config_role_arn}" 178 | } 179 | }, 180 | "DeliveryChannel": { 181 | "Type": "AWS::Config::DeliveryChannel", 182 | "Properties": { 183 | "ConfigSnapshotDeliveryProperties": { 184 | "DeliveryFrequency": "${delivery_channel_delivery_frequency}" 185 | }, 186 | "Name": "default", 187 | "S3BucketName": "${delivery_channel_s3_bucket_name}", 188 | "S3KeyPrefix": "${delivery_channel_s3_bucket_prefix}" 189 | }, 190 | "DependsOn": [ 191 | "ConfigurationRecorderSanitisationResults" 192 | ] 193 | } 194 | } 195 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