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Cloud Posse

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This is a secure/locked-down bastion implemented as a Docker Container. It uses Alpine Linux as the base image and ships with support for Google Authenticator & DUO MFA support.

It was designed to be used on Kubernetes together with GitHub Authorized Keys to provide secure remote access to production clusters.

MFA Setup & Usage

Here's a demo of what a user experiences when setting up Google Authenticator for the first time.

Demo 1

When using Duo as the MFA provider, this becomes even more magical because Duo supports automatic Push notifications to your mobile device. Just approve the request on your mobile phone (e.g. with a thumb press on iOS) when prompted.

Slack Notifications

Here's what it looks like when someone connects to the bastion if Slack notifications are enabled.

Demo 2

We recommend using Slack notifications for self-reporting.


This project is part of our comprehensive "SweetOps" approach towards DevOps. <img align="right" title="Share via Email" src="https://docs.cloudposse.com/images/ionicons/ios-email-outline-2.0.1-16x16-999999.svg"/> <img align="right" title="Share on Google+" src="https://docs.cloudposse.com/images/ionicons/social-googleplus-outline-2.0.1-16x16-999999.svg" /> <img align="right" title="Share on Facebook" src="https://docs.cloudposse.com/images/ionicons/social-facebook-outline-2.0.1-16x16-999999.svg" /> <img align="right" title="Share on Reddit" src="https://docs.cloudposse.com/images/ionicons/social-reddit-outline-2.0.1-16x16-999999.svg" /> <img align="right" title="Share on LinkedIn" src="https://docs.cloudposse.com/images/ionicons/social-linkedin-outline-2.0.1-16x16-999999.svg" /> <img align="right" title="Share on Twitter" src="https://docs.cloudposse.com/images/ionicons/social-twitter-outline-2.0.1-16x16-999999.svg" />

It's 100% Open Source and licensed under the APACHE2.

Usage

Running

Refer to the Environment Variables section below to tune how the bastion operates.

$ docker run -p 1234:22 cloudposse/bastion:latest

Building

$ git clone https://github.com/cloudposse/bastion.git
$ cd bastion
$ make docker:build

Testing

Run basic connection tests

$ make test

Configuration

Recommendations

Environment Variables

The following tables lists the most relevant environment variables of the bastion image and their default values.

Duo Settings

Duo is a enterprise MFA provider that is very affordable. Details here: https://duo.com/pricing

ENVDescriptionDefault
MFA_PROVIDEREnable the Duo MFA providerduo
DUO_IKEYDuo Integration Key
DUO_SKEYDuo Secret Key
DUO_HOSTDuo Host Endpoint
DUO_FAILMODEHow to fail if Duo cannot be reachedsecure
DUO_AUTOPUSHAutomatically send a push notificationyes
DUO_PROMPTSHow many times to prompt for MFA1
Google Authenticator Settings

Google Authenticator is a free & open source MFA solution. It's less secure than Duo because tokens are stored on the server under each user account.

ENVDescriptionDefault
MFA_PROVIDEREnable the Google Authenticator providergoogle-authenticator
Enforcer Settings

The enforcer ensures certain conditions are satisfied. Currently, these options are supported.

ENVDescriptionDefault
ENFORCER_ENABLEDEnable general enforcementtrue
ENFORCER_CLEAN_HOME_ENABLEDErase dot files in home directory before starting sessiontrue
Slack Notifications

The enforcer is able to send notifications to a slack channel anytime there is an SSH login.

ENVDescriptionDefault
SLACK_ENABLEDEnabled Slack integrationfalse
SLACK_HOOKSlack integration method (e.g. pam, sshrc)sshrc
SLACK_WEBHOOK_URLWebhook URL
SLACK_USERNAMESlack handle of bot (defaults to short-dns name)
SLACK_TIMEOUTRequest timeout2
SLACK_FATAL_ERRORSDeny logins if slack notification failstrue
SSH Auditor

The SSH auditor uses sudosh to record entire SSH sessions (stdin, stdout, and stderr).

ENVDescriptionDefault
SSH_AUDIT_ENABLEDEnable the SSH Audit facilitytrue

This will require that users login with the /usr/bin/sudosh shell.

Update user's default shell by running the command: usermod -s /usr/bin/sudosh $username. By default, root will automatically be updated to use sudosh.

Use the sudoreplay command to audit/replay sessions.

User Accounts & SSH Keys

The bastion does not attempt to manage user accounts. We suggest using GitHub Authorized Keys to provision user accounts and SSH keys. We provide a chart of how we recommend doing it.

Extending

The bastion was written to be easily extensible.

You can extend the enforcement policies by adding shell scripts to etc/enforce.d. Any scripts that are +x (e.g. chmod 755) will be executed at runtime.

Thanks

Quick Start

Here's how you can quickly demo the bastion. We assume you have ~/.ssh/authorized_keys properly configured and your SSH key (e.g. ~/.ssh/id_rsa) added to your SSH agent.

$ docker run -it -p 1234:22 \
     -e MFA_PROVIDER=google-authenticator \
     -v ~/.ssh/authorized_keys:/root/.ssh/authorized_keys \
     cloudposse/bastion

Now, in another terminal you should be able to run:

$ ssh root@localhost -p 1234

The first time you connect, you'll be asked to setup your MFA device. Subsequently, each time you connect, you'll be prompted to enter your MFA token.

Help

Got a question? We got answers.

File a GitHub issue, send us an email or join our Slack Community.

README Commercial Support

DevOps Accelerator for Startups

We are a DevOps Accelerator. We'll help you build your cloud infrastructure from the ground up so you can own it. Then we'll show you how to operate it and stick around for as long as you need us.

Learn More

Work directly with our team of DevOps experts via email, slack, and video conferencing.

We deliver 10x the value for a fraction of the cost of a full-time engineer. Our track record is not even funny. If you want things done right and you need it done FAST, then we're your best bet.

Slack Community

Join our Open Source Community on Slack. It's FREE for everyone! Our "SweetOps" community is where you get to talk with others who share a similar vision for how to rollout and manage infrastructure. This is the best place to talk shop, ask questions, solicit feedback, and work together as a community to build totally sweet infrastructure.

Discourse Forums

Participate in our Discourse Forums. Here you'll find answers to commonly asked questions. Most questions will be related to the enormous number of projects we support on our GitHub. Come here to collaborate on answers, find solutions, and get ideas about the products and services we value. It only takes a minute to get started! Just sign in with SSO using your GitHub account.

Newsletter

Sign up for our newsletter that covers everything on our technology radar. Receive updates on what we're up to on GitHub as well as awesome new projects we discover.

Office Hours

Join us every Wednesday via Zoom for our weekly "Lunch & Learn" sessions. It's FREE for everyone!

zoom

Contributing

Bug Reports & Feature Requests

Please use the issue tracker to report any bugs or file feature requests.

Developing

If you are interested in being a contributor and want to get involved in developing this project or help out with our other projects, we would love to hear from you! Shoot us an email.

In general, PRs are welcome. We follow the typical "fork-and-pull" Git workflow.

  1. Fork the repo on GitHub
  2. Clone the project to your own machine
  3. Commit changes to your own branch
  4. Push your work back up to your fork
  5. Submit a Pull Request so that we can review your changes

NOTE: Be sure to merge the latest changes from "upstream" before making a pull request!

Copyright

Copyright © 2017-2023 Cloud Posse, LLC

License

License

See LICENSE for full details.

Licensed to the Apache Software Foundation (ASF) under one
or more contributor license agreements.  See the NOTICE file
distributed with this work for additional information
regarding copyright ownership.  The ASF licenses this file
to you under the Apache License, Version 2.0 (the
"License"); you may not use this file except in compliance
with the License.  You may obtain a copy of the License at

  https://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing,
software distributed under the License is distributed on an
"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
KIND, either express or implied.  See the License for the
specific language governing permissions and limitations
under the License.

Trademarks

All other trademarks referenced herein are the property of their respective owners.

About

This project is maintained and funded by Cloud Posse, LLC. Like it? Please let us know by leaving a testimonial!

Cloud Posse

We're a DevOps Professional Services company based in Los Angeles, CA. We ❤️ Open Source Software.

We offer paid support on all of our projects.

Check out our other projects, follow us on twitter, apply for a job, or hire us to help with your cloud strategy and implementation.

Contributors

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Erik Osterman<br/>Erik OstermanMarji Cermak<br/>Marji Cermak
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