Managing Google Cloud Platform Project-Wide SSH Keys

As a member of the Infrastructure Security team, Cailyn set out to create an application to silently and effectively manage SSH keys that persist inside of Shopify's Google Cloud Platform project-wide metadata.

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Shopify
•
Cailyn Edwards
•12 min read•beginner•
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•View Original
GolangGoogle CloudGoogle Compute EngineJuliaKubernetesOAuthRailsRubyShell

Overview

The article discusses the management of project-wide SSH keys in Google Cloud Platform (GCP) and the potential security risks associated with persistent SSH keys. It highlights Shopify's approach to creating an application called SSH-Pruner to automate the management of these keys, ensuring they do not persist longer than necessary while minimizing disruption to developer workflows.

What You'll Learn

1

How to manage SSH keys effectively in Google Cloud Platform projects

2

Why persistent SSH keys pose security risks and how to mitigate them

3

When to implement automated key management solutions like SSH-Pruner

Prerequisites & Requirements

  • Understanding of SSH and its role in secure communications
  • Familiarity with Google Cloud Platform and its services
  • Experience with Google Cloud APIs(optional)
  • Basic programming skills, preferably in Go(optional)

Key Questions Answered

What are the risks associated with persistent SSH keys in GCP?
Persistent SSH keys in Google Cloud Platform can lead to unauthorized access if they fall into the wrong hands, allowing users with the matching private key to connect to any Linux VM in the project with root access. This poses significant security risks, especially if keys are not managed properly.
How does SSH-Pruner help in managing SSH keys?
SSH-Pruner is an application developed to automate the management of SSH keys in GCP by iterating through projects, removing expired or invalid keys, and ensuring that only valid keys persist. This helps maintain security without disrupting developer workflows.
What criteria were established for the SSH key management solution?
The criteria for the SSH key management solution included ensuring keys do not persist longer than necessary, minimal impact on developer workflows, distinguishing between Shopify's keys and Google's keys, and creating useful logging for monitoring key usage.
Why is it important to manage SSH keys in a high-trust environment like Shopify?
In a high-trust environment like Shopify, managing SSH keys is crucial to prevent unauthorized access while still allowing developers the flexibility to work efficiently. Proper key management helps mitigate risks associated with persistent keys and enhances overall security.

Technologies & Tools

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Cloud Computing
Google Cloud Platform
Used for hosting virtual machines and managing project-wide SSH keys.
Container Orchestration
Google Kubernetes Engine
Facilitates deployment and management of applications on GCP.
Programming Language
Go
Used to develop the SSH-Pruner application.

Key Actionable Insights

1
Implement automated SSH key management to enhance security and reduce risks.
By automating the management of SSH keys, organizations can ensure that only necessary keys are active, minimizing the risk of unauthorized access and potential security breaches.
2
Regularly audit SSH key usage and access patterns to identify potential vulnerabilities.
Monitoring how and when SSH keys are used can provide valuable insights into security practices and help identify areas that require tighter controls or adjustments.
3
Educate developers about the importance of SSH key management and security best practices.
Raising awareness among developers about the risks associated with persistent SSH keys can foster a culture of security and encourage proactive management of access credentials.

Common Pitfalls

1
Assuming that deleting all SSH keys indiscriminately will not disrupt workflows.
This approach can lead to the removal of essential keys, including those used by Google for infrastructure management, causing failures in scripts that rely on persistent keys.
2
Not implementing robust logging for SSH key management actions.
Without effective logging, it becomes challenging to trace key usage and identify potential security incidents, making it difficult to maintain accountability.

Related Concepts

SSH Key Management Best Practices
Security Protocols In Cloud Environments
Automation In Infrastructure Security