Unless otherwise noted, we have not used or evaluated evaluated these tools. As per usual with open source tools, be sure to evaluate tools before adopting them to ensure they are worthy of your trust.

→ CIT Cloud Team has used the tool.

→ looks very promising or seems to have widespread use

IAM-Specific Tools

Access Key Management

awscli-login – Access Keys for AWS CLI Using Cornell Two-Step Login - Shibboleth
99designs/aws-vault – A vault for securely storing and accessing AWS credentials in development environments
rapid7/awsaml – Awsaml is an application for providing automatically rotated temporary AWS credentials.
RiotGames/key-conjurer – Temporary Credential Service
aws-rotate-key – Easily rotate your AWS access key
synfinatic/aws-sso-cli – Tool to make it easier to use AWS SSO for the CLI and web console.
toshke/aws-keys-sectool – Tool that helps to lock down IAM access keys by adding IP-restrictions to IAM policies.

IAM/Resources Policy

AWS Policy Generator – The AWS Policy Generator is a tool that enables you to create policies that control access to Amazon Web Services (AWS) products and resources.
salesforce/policy_sentry – IAM Least Privilege Policy Generator
duo-labs/cloudtracker – CloudTracker helps you find over-privileged IAM users and roles by comparing CloudTrail logs with current IAM policies.
goldfiglabs/rpCheckup – rpCheckup is an AWS resource policy security checkup tool that identifies public, external account access, intra-org account access, and private resources.
iann0036/iamlive – Generate an IAM policy from AWS calls using client-side monitoring (CSM) or embedded proxy
Netflix/repokid – Repokid removes permissions granting access to unused services from the inline policies of IAM roles in an AWS account.
aminohealth/wonk - tool that analyzes IAM policies and minimizes them to fit under IAM policy length limits
aws.permissions.cloud – uses a variety of information gathered within the IAM Dataset and exposes that information in a clean, easy-to-read format.
ermetic/access-undenied-aws – parses AWS AccessDenied CloudTrail events, explains the reasons for them, and offers actionable remediation steps

Tools that Help Secure AWS Resources

Multiple Resource Types

asecure.cloud – Creates customized CloudFormation/Terraform templates to improve security of existing AWS resources, or deploy secured resources.
cloud-custodian/cloud-custodian – Rules engine for cloud security, cost optimization, and governance, DSL in yaml for policies to query, filter, and take actions on resources
toniblyx/prowler – Prowler is a security tool to perform AWS security best practices assessments, audits, incident response, continuous monitoring, hardening and forensics readiness.
aquasecurity/cloudsploit – Cloud Security Posture Management (CSPM)
airbnb/streamalert – StreamAlert is a serverless, realtime data analysis framework which empowers you to ingest, analyze, and alert on data from any environment, using datasources and alerting logic you define.
RhinoSecurityLabs/pacu – The AWS exploitation framework, designed for testing the security of Amazon Web Services environments.
Netflix/security_monkey – Security Monkey monitors AWS, GCP, OpenStack, and GitHub orgs for assets and their changes over time.
RiotGames/cloud-inquisitor – Enforce ownership and data security within AWS
tmobile/pacbot – Policy as Code Bot (PacBot) is a platform for continuous compliance monitoring, compliance reporting and security automation for the cloud.
darkbitio/aws-recon – Multi-threaded AWS inventory collection tool with a focus on security-relevant resources and metadata.
righteousgambitresearch/quiet-riot – Unauthenticated enumeration of services, roles, and users in an AWS account or in every AWS account in existence.
fivexl/terraform-aws-cloudtrail-to-slack – Terraform module that deploys resources to parse AWS CloudTrail events and send alerts to Slack for events that match pre-configured rules
cloudquery/cloudquery – Open-source cloud asset inventory powered by SQL. Can also perform Terraform drift checks.
turbot/steampipe – Use SQL to instantly query your cloud services (AWS, Azure, GCP and more). Open source CLI. No DB required.
simonw/s3-credentials – A tool for creating credentials for accessing S3 buckets. Helps generate tightly-scoped IAM policies limited to a single prefix within a single bucket.
nccgroup/ScoutSuite – Scout Suite is an open source multi-cloud security-auditing tool, which enables security posture assessment of cloud environments.
DataDog/stratus-red-team – Stratus Red Team is "Atomic Red Team™" for the cloud, allowing to emulate offensive attack techniques in a granular and self-contained manner.
awslabs/aws-cloudsaga – Simulate security events in AWS
awslabs/aws-automated-incident-response-and-forensics – The Automated Incident Response and Forensics aims to facilitate automated steps for incident response and forensics based on the AWS Incident Response White Paper
awslabs/aws-security-assessment-solution – An AWS tool to help you create a point in time assessment of your AWS account using Prowler and Scout as well as optional AWS developed ransomware checks.
jonrau1/ElectricEye – Continuously monitor your AWS attack surface and evaluate services for configurations that can lead to degradation of confidentiality, integrity or availability.

CloudFormation

cfripper – Library and CLI tool for analyzing CloudFormation templates and check them for security compliance
stelligent/cfn_nag – The cfn-nag tool looks for patterns in CloudFormation templates that may indicate insecure infrastructure.

Keys and Secrets

awslabs/git-secrets – Prevents you from committing secrets and credentials into git repositories
exec-with-secrets – Handle secrets in Docker using AWS KMS, SSM parameter store, Secrets Manager, or Azure Key Vault
dxa4481/truffleHog – Searches through git repositories for high entropy strings and secrets, digging deep into commit history
zricethezav/gitleaks – Scan git repos (or files) for secrets using regex and entropy

S3

sa7mon/S3Scanner – Scan for open AWS S3 buckets and dump the contents

Useful Articles

21 Nov 2021 Github Actions & AWS OIDC
27 Oct 2022 GitHub Actions: Secure cloud deployments with OpenID Connect – GitHub Actions now supports OpenID Connect (OIDC) for secure deployments to cloud, which uses short-lived tokens that are automatically rotated for each deployment.
05 Oct 2021 AWS Access Keys - A Reference — This post outlines how to identify the different types of keys, where you’re likely to find them across the different services, and the order of access precedence for the different SDKs and tools.
23 Sep 2021 IAM Vulnerable - Assessing the AWS Assessment Tools
15 Sep 2021 AWS federation comes to GitHub Actions

Training and Tutorials

AWS Security Workshops – A collection of the latest AWS Security workshops from AWS
Serverless Security Workshop – In this workshop, you will learn techniques to secure a serverless application built with AWS Lambda, Amazon API Gateway and RDS Aurora. From AWS
flAWS 2 Challenge – Teaches you AWS (Amazon Web Services) security concepts. The challenges are focused on AWS specific issues, so no buffer overflows, XSS, etc. Able to be attacker or defender for challenges.
CI/CDon't – An active learning exercise where you plan the bad guy where your goal is to gain access to administrative credentials for an AWS account.

Other Compilations of Security Resources

puresec/awesome-serverless-security – A curated list of serverless security resources such as (e)books, articles, whitepapers, blogs and research papers.
toniblyx/my-arsenal-of-aws-security-tools – List of open source tools for AWS security: defensive, offensive, auditing, DFIR, etc.