New Skeletal Resource aws_config_delivery_channel (#2641)

* Initial commit of new skeletal resource aws_config_delivery_channel
* Changes delivery_frequency to be an integer and names delivery_frequency_in_hours
* Adds more documentation and clarifies descriptions
* Wraps API call in the aws_catch_errors function
* Changes config bucket name to use dashes instead of underscores
* Updates on master and changes directory location of build and integration files
* Fix integration tests to only create one ConfigRecorder

Signed-off-by: Matthew Dromazos <dromazmj@dukes.jmu.edu>

docs/resources/aws_config_delivery_channel.md

@@ -0,0 +1,79 @@
+---
+title: About the aws_config_delivery_channel Resource
+---
+
+# aws_config_delivery_channel
+
+The AWS Config service can monitor and record changes to your AWS resource configurations.  A Delivery Channel can record the changes
+to an S3 Bucket, an SNS or both.
+
+Use the `aws_config_delivery_channel` InSpec audit resource to examine how the AWS Config service delivers those change notifications.
+
+<br>
+
+## Syntax
+
+An `aws_config_delivery_channel` resource block declares the tests for a single AWS Config delivery channel.
+
+    describe aws_config_delivery_channel('my_channel') do
+      it { should exist }
+    end
+
+    describe aws_config_delivery_channel(channel_name: 'my-channel') do
+      it { should exist }
+    end
+
+<br>
+
+## Examples
+
+The following examples show how to use this InSpec audit resource.
+
+### Test how frequent the channel writes configuration changes to the s3 bucket.
+
+    describe aws_config_delivery_channel(channel_name: 'my-recorder') do
+      its(delivery_frequency_in_hours) { should be > 3 }
+    end
+    
+## Properties
+    
+### s3_bucket_name
+
+Provides the name of the s3 bucket that the channel sends configuration changes to.  This is an optional value since a Delivery Channel can also talk to an SNS.
+
+    describe aws_config_delivery_channel(channel_name: 'my_channel')
+      its('s3_bucket_name') { should eq 'my_bucket' }
+    end
+    
+### s3_key_prefix
+
+Provides the s3 object key prefix (or "path") under which configuration data will be recorded.
+
+    describe aws_config_delivery_channel(channel_name: 'my_channel')
+      its('s3_key_prefix') { should eq 'log/' }
+    end
+    
+### sns_topic_arn
+
+Provides the ARN of the SNS topic for which the channel sends notifications about configuration changes.
+
+    describe aws_config_delivery_channel(channel_name: 'my_channel')
+      its('sns_topic_arn') { should eq 'arn:aws:sns:us-east-1:721741954427:sns_topic' }
+    end
+    
+### delivery_frequency_in_hours
+
+Provides how often the AWS Config sends configuration changes to the s3 bucket in the delivery channel.
+
+    describe aws_config_delivery_channel(channel_name: 'my_channel')
+      its('delivery_frequency_in_hours') { should eq 24 }
+      its('delivery_frequency_in_hours') { should be > 24 }
+    end
+    
+    
+<br>
+
+## Matchers
+
+This resource provides no matchers, aside from the standard exists matcher.
+

lib/resource_support/aws.rb

@@ -16,6 +16,7 @@ require 'resources/aws/aws_cloudtrail_trail'
 require 'resources/aws/aws_cloudtrail_trails'
 require 'resources/aws/aws_cloudwatch_alarm'
 require 'resources/aws/aws_cloudwatch_log_metric_filter'
+require 'resources/aws/aws_config_delivery_channel'
 require 'resources/aws/aws_config_recorder'
 require 'resources/aws/aws_ec2_instance'
 require 'resources/aws/aws_iam_access_key'

lib/resources/aws/aws_config_delivery_channel.rb

@@ -0,0 +1,76 @@
+class AwsConfigDeliveryChannel < Inspec.resource(1)
+  name 'aws_config_delivery_channel'
+  desc 'Verifies settings for AWS Config Delivery Channel'
+  example "
+    describe aws_config_delivery_channel do
+      it { should exist }
+      its('s3_bucket_name') { should eq 'my_bucket' }
+      its('sns_topic_arn') { should eq arn:aws:sns:us-east-1:721741954427:sns_topic' }
+    end
+  "
+  supports platform: 'aws'
+
+  include AwsSingularResourceMixin
+  attr_reader :channel_name, :s3_bucket_name, :s3_key_prefix, :sns_topic_arn,
+              :delivery_frequency_in_hours
+
+  def to_s
+    "Config_Delivery_Channel: #{@channel_name}"
+  end
+
+  private
+
+  def validate_params(raw_params)
+    validated_params = check_resource_param_names(
+      raw_params: raw_params,
+      allowed_params: [:channel_name],
+      allowed_scalar_name: :channel_name,
+      allowed_scalar_type: String,
+    )
+
+    # Make sure channel_name is given as param
+    if validated_params[:channel_name].nil?
+      raise ArgumentError, 'You must provide a channel_name to aws_config_delivery_channel'
+    end
+
+    validated_params
+  end
+
+  def fetch_from_api
+    backend = BackendFactory.create(inspec_runner)
+    query = { delivery_channel_names: [@channel_name] }
+    catch_aws_errors do
+      @resp = backend.describe_delivery_channels(query)
+    end
+    @exists = !@resp.empty?
+    return unless @exists
+
+    @channel = @resp.delivery_channels.first.to_h
+    @channel_name = @channel[:name]
+    @s3_bucket_name = @channel[:s3_bucket_name]
+    @s3_key_prefix = @channel[:s3_key_prefix]
+    @sns_topic_arn = @channel[:sns_topic_arn]
+    @delivery_frequency_in_hours = @channel[:config_snapshot_delivery_properties][:delivery_frequency] unless @channel[:config_snapshot_delivery_properties].nil?
+    frequencies = {
+      'One_Hour' => 1,
+      'TwentyFour_Hours' => 24,
+      'Three_Hours' => 3,
+      'Six_Hours' => 6,
+      'Twelve_Hours' => 12,
+    }
+    @delivery_frequency_in_hours = frequencies[@delivery_frequency_in_hours]
+  end
+
+  class Backend
+    class AwsClientApi < AwsBackendBase
+      BackendFactory.set_default_backend(self)
+      self.aws_client_class = Aws::ConfigService::Client
+
+      def describe_delivery_channels(query)
+        aws_service_client.describe_delivery_channels(query)
+      rescue Aws::ConfigService::Errors::NoSuchDeliveryChannelException
+        return {}
+      end
+    end
+  end
+end

test/integration/aws/default/build/config.tf

@@ -34,3 +34,80 @@ output "role_for_config_recorder_arn" {
 output "config_recorder_name" {
   value = "${aws_config_configuration_recorder.config_recorder.name}"
 }
+
+#======================================================#
+#             Configuration Delivery Channel
+#======================================================#
+
+# Note that since AWS accounts can only have one Config Recorder,
+# we have to re-use it here (as well as its role).
+
+resource "aws_config_delivery_channel" "delivery_channel_01" {
+  name           = "delivery_channel_01"
+  s3_bucket_name = "${aws_s3_bucket.bucket_for_delivery_channel.bucket}"
+  depends_on     = ["aws_config_configuration_recorder.config_recorder"]
+  sns_topic_arn  = "${aws_sns_topic.sns_topic_for_delivery_channel.arn}"
+  snapshot_delivery_properties = {
+    delivery_frequency = "TwentyFour_Hours"
+  }
+}
+
+
+output "delivery_channel_01" {
+  value = "${aws_config_delivery_channel.delivery_channel_01.id}"
+}
+
+output "config_recorder_for_delivery_channel_role_arn" {
+  value = "${aws_iam_role.role_for_config_recorder.arn}"
+}
+
+#======================================================#
+#                    IAM Roles
+#======================================================#
+
+resource "aws_iam_role_policy" "policy_for_delivery_channel" {
+  name = "policy_for_delivery_channel"
+  role = "${aws_iam_role.role_for_config_recorder.id}"
+
+  policy = <<POLICY
+{
+  "Version": "2012-10-17",
+  "Statement": [
+    {
+      "Action": [
+        "s3:*"
+      ],
+      "Effect": "Allow",
+      "Resource": [
+        "${aws_s3_bucket.bucket_for_delivery_channel.arn}",
+        "${aws_s3_bucket.bucket_for_delivery_channel.arn}/*"
+      ]
+    }
+  ]
+}
+POLICY
+}
+
+#=================================================================#
+#                      Config S3 Buckets
+#=================================================================#
+resource "aws_s3_bucket" "bucket_for_delivery_channel" {
+  bucket        = "inspec-bucket-for-delivery-channel-${terraform.env}.chef.io"
+  acl           = "public-read"
+  force_destroy = true
+}
+
+output "s3_bucket_for_delivery_channel" {
+  value = "${aws_s3_bucket.bucket_for_delivery_channel.id}"
+}
+
+#===========================================================================#
+#                                 SNS Topic
+#===========================================================================#
+resource "aws_sns_topic" "sns_topic_for_delivery_channel" {
+  name = "${terraform.env}-sns_topic_for_delivery_channel"
+}
+
+output "sns_topic_for_delivery_channel_arn" {
+  value = "${aws_sns_topic.sns_topic_for_delivery_channel.arn}"
+}

test/integration/aws/default/verify/controls/aws_config_delivery_channel.rb

@@ -0,0 +1,48 @@
+fixtures = {}
+[
+  'delivery_channel_01',
+  'config_recorder_for_delivery_channel_role_arn',
+  's3_bucket_for_delivery_channel',
+  'delivery_channel_01_bucket_prefix',
+  'sns_topic_for_delivery_channel_arn'
+].each do |fixture_name|
+  fixtures[fixture_name] = attribute(
+    fixture_name,
+    default: "default.#{fixture_name}",
+    description: 'See ../build/iam.tf',
+  )
+end
+
+#======================================================#
+#         aws_config_delivery_channel - Singular
+#======================================================#
+
+#-------------------  Recall / Miss -------------------#
+
+control "aws_config_delivery_channel recall" do
+  # Test scalar param
+  describe aws_config_delivery_channel(fixtures['delivery_channel_01']) do
+    it { should exist }
+  end
+  
+  # Test hash parameter
+  describe aws_config_delivery_channel(channel_name: fixtures['delivery_channel_01']) do
+    it { should exist }
+  end
+  
+  # Test recorder that doesnt exist
+  describe aws_config_delivery_channel(channel_name: 'NonExistentChannel') do
+    it { should_not exist }
+  end
+end
+
+#-------------------  Properties -------------------#
+control "aws_config_delivery_channel properties" do
+  describe aws_config_delivery_channel(fixtures['delivery_channel_01']) do
+    its('s3_bucket_name') { should eq fixtures['s3_bucket_for_delivery_channel'] }
+    its('s3_key_prefix') { should eq nil }
+    its('sns_topic_arn') { should eq fixtures['sns_topic_for_delivery_channel_arn'] }
+    its('delivery_frequency_in_hours') { should eq 24 }
+    its('delivery_frequency_in_hours') { should be > 3 }
+  end
+end