Author = https://martinmueller.dev

cdk-prowler

An AWS CDK custom construct for deploying Prowler to your AWS Account. The following description about Prowler is taken from https://github.com/prowler-cloud/prowler

Prowler is a security tool to perform AWS security best practices assessments, audits, incident response, continuous monitoring, hardening and forensics readiness. It contains all CIS controls listed here https://d0.awsstatic.com/whitepapers/compliance/AWS_CIS_Foundations_Benchmark.pdf and more than 100 additional checks that help on GDPR, HIPAA …

It generates security html results which are stored in an s3 bucket:

And in your Codebuild Report group:

The current Prowler version is 2.7.0

AWS AMI

If you just want to make the Prowler security checks in your account try my Prowler AWS Marketplace AMI. With just $1 Prowler will do over 180 security checks across a huge amount of AWS services in all your regions. Don't forget the terminate the Ec2 instance when the Prowler stack got created for not paying more than that $1 :).

With buying the AMI you support my on my passion for creating open source products like this cdk-prowler construct. Furthermore you enable me to work on future features like mentioned in the Planned Features section. Thank you so much :) !

Example

import { ProwlerAudit } from 'cdk-prowler';
...
    const app = new App();

    const stack = new Stack(app, 'ProwlerAudit-stack');

    new ProwlerAudit(stack, 'ProwlerAudit');

Architect diagram

Curious how I did the diagram? Have a look here https://martinmueller.dev/cdk-dia-eng .

cdk-prowler Properties

cdk-prowler supports some properties to tweak your stack. Like for running a Cloudwatch schedule to regualary run the Prowler scan with a defined cron expression.

API Reference

Constructs

ProwlerAudit

Creates a CodeBuild project to audit an AWS account with Prowler and stores the html report in a S3 bucket.

This will run onece at the beginning and on a schedule afterwards. Partial contribution from https://github.com/stevecjones

Initializers

import { ProwlerAudit } from 'cdk-prowler'

new ProwlerAudit(parent: Stack, id: string, props?: ProwlerAuditProps)

parentRequired

• Type: @aws-cdk/core.Stack

idRequired

• Type: string

propsOptional

• Type: cdk-prowler.ProwlerAuditProps

Properties

codebuildProjectRequired

public readonly codebuildProject: Project;

• Type: @aws-cdk/aws-codebuild.Project

enableSchedulerRequired

public readonly enableScheduler: boolean;

• Type: boolean

logsRetentionInDaysRequired

public readonly logsRetentionInDays: RetentionDays;

• Type: @aws-cdk/aws-logs.RetentionDays

prowlerOptionsRequired

public readonly prowlerOptions: string;

• Type: string

prowlerSchedulerRequired

public readonly prowlerScheduler: string;

• Type: string

prowlerVersionRequired

public readonly prowlerVersion: string;

• Type: string

serviceNameRequired

public readonly serviceName: string;

• Type: string

Structs

ProwlerAuditProps

Initializer

import { ProwlerAuditProps } from 'cdk-prowler'

const prowlerAuditProps: ProwlerAuditProps = { ... }

additionalS3CopyArgsOptional

public readonly additionalS3CopyArgs: string;

• Type: string

An optional parameter to add to the S3 bucket copy command.

allowlistOptional

public readonly allowlist: Asset;

• Type: @aws-cdk/aws-s3-assets.Asset
• Default: undefined

An Prowler-specific Allowlist file.

If a value is provided then this is passed to Prowler on runs using the '-w' flag. If no value is provided, the -w parameter is not used. If you provide an asset that is zipped, it must contain an 'allowlist.txt' file which will be passed to Prowler.

enableSchedulerOptional

public readonly enableScheduler: boolean;

• Type: boolean
• Default: false

enables the scheduler for running prowler periodically.

Together with prowlerScheduler.

logsRetentionInDaysOptional

public readonly logsRetentionInDays: RetentionDays;

• Type: @aws-cdk/aws-logs.RetentionDays
• Default: : 3

Specifies the number of days you want to retain CodeBuild run log events in the specified log group.

Junit reports are kept for 30 days, HTML reports in S3 are not deleted

prowlerOptionsOptional

public readonly prowlerOptions: string;

• Type: string
• Default: '-M text,junit-xml,html,csv,json'

Options to pass to Prowler command, make sure at least -M junit-xml is used for CodeBuild reports.

Use -r for the region to send API queries, -f to filter only one region, -M output formats, -c for comma separated checks, for all checks do not use -c or -g, for more options see -h. For a complete assessment use "-M text,junit-xml,html,csv,json", for SecurityHub integration use "-r region -f region -M text,junit-xml,html,csv,json,json-asff -S -q"

prowlerSchedulerOptional

public readonly prowlerScheduler: string;

• Type: string
• Default: 'cron(0 22 ** ? *)'

The time when Prowler will run in cron format.

Default is daily at 22:00h or 10PM 'cron(0 22 ** ? *)', for every 5 hours also works 'rate(5 hours)'. More info here https://docs.aws.amazon.com/AmazonCloudWatch/latest/events/ScheduledEvents.html.

prowlerVersionOptional

public readonly prowlerVersion: string;

• Type: string
• Default: 2.5.0

Specifies the concrete Prowler version.

reportBucketOptional

public readonly reportBucket: IBucket;

• Type: @aws-cdk/aws-s3.IBucket

An optional S3 bucket to store the Prowler reports.

reportBucketPrefixOptional

public readonly reportBucketPrefix: string;

• Type: string

An optional prefix for the report bucket objects.

serviceNameOptional

public readonly serviceName: string;

• Type: string
• Default: : prowler

Specifies the service name used within component naming.

Cross Account Buckets

By providing your own Bucket you can have the CodeBuild project drop the Prowler results in another account. Make sure that you have your Bucket policy setup to allow the account running the Prowler reports access to writing those record. Additionally, you will probably want to provide an additionalS3CopyArgs: '--acl bucket-owner-full-control' to ensure that those object can be read by the account owner.

Planned Features

• Supporting AWS SecurityHub https://github.com/prowler-cloud/prowler#security-hub-integration
• Triggering an event with SNS when prowler finishes the run
• AMI EC2 executable

Architecture

Misc

yes | yarn destroy && yarn deploy --require-approval never

Rerun Prowler on deploy

yarn deploy --require-approval never -c reRunProwler=true

Thanks To

• My friend and fellaw ex colleague Tony de la Fuente (https://github.com/toniblyx https://twitter.com/ToniBlyx) for developing such a cool security tool as Prowler
• As always to the amazing CDK / Projen Community. Join us on Slack!
• Projen project and the community around it