Behind the scenes of GitHub Token Scanning

We’ve extended GitHub Token Scanning to include tokens from cloud service providers and additional credentials.

Patrick Toomey
5 min readadvanced
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Overview

The article discusses GitHub's Token Scanning feature, which scans public repositories for sensitive tokens, including GitHub OAuth tokens and personal access tokens. It highlights the evolution from Token Scanning 1.0 to 2.0, emphasizing the integration of the Hyperscan library for improved performance and extensibility in identifying various credentials.

What You'll Learn

1

How to implement GitHub Token Scanning for various cloud service providers

2

Why using the Hyperscan library enhances performance in credential scanning

3

When to notify users about exposed credentials in public repositories

Prerequisites & Requirements

  • Understanding of OAuth tokens and cloud service credentials
  • Familiarity with Git and GitHub repositories(optional)

Key Questions Answered

What is GitHub Token Scanning and how does it work?
GitHub Token Scanning is a feature that scans public repositories for sensitive credentials, such as GitHub OAuth tokens and personal access tokens. It has evolved to include scanning for tokens from various cloud service providers, helping to identify and mitigate security risks associated with exposed credentials.
How did GitHub improve its Token Scanning capabilities?
GitHub improved its Token Scanning capabilities by transitioning from a hand-tuned assembly code solution to a new standalone scanner built with the Hyperscan library. This change allows for better performance and the ability to support multiple credential formats, enhancing the scanning process for various cloud service providers.
What feedback has GitHub received from cloud service providers about Token Scanning?
During the private beta, cloud service providers reported that GitHub Token Scanning was effective in identifying credentials before they could be exploited by malicious users. This feedback highlights the importance of proactive security measures in protecting sensitive information.
What actions are taken when a credential is identified during scanning?
When a credential is identified during scanning, it is sent to the respective cloud service provider along with metadata like the repository name and commit details. The provider can then validate the credential and determine if it should be revoked, often notifying the credential owner about the action taken.

Key Statistics & Figures

Public repository changes scanned
Millions
During the private beta, GitHub scanned millions of public repository changes to identify candidate credentials.
Candidate credentials identified
Millions
The scanning process identified millions of candidate credentials, highlighting the scale of potential security issues.

Technologies & Tools

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Library
Hyperscan
Used for high-performance scanning of credentials in GitHub Token Scanning.
Programming Language
Go
The new standalone scanner for Token Scanning is written in Go.

Key Actionable Insights

1
Implement GitHub Token Scanning in your public repositories to enhance security.
By proactively scanning for sensitive credentials, developers can prevent unauthorized access to their resources and protect user data from potential breaches.
2
Utilize the Hyperscan library for high-performance scanning of various credential formats.
Switching to the Hyperscan library allows for more efficient scanning processes, which is crucial when dealing with large repositories or multiple credential types.
3
Engage with cloud service providers to improve the effectiveness of credential scanning.
Collaborating with providers can lead to better identification and management of exposed credentials, enhancing overall security for users.

Common Pitfalls

1
Failing to secure sensitive credentials in code repositories can lead to significant security breaches.
Developers often overlook the importance of managing credentials properly, which can result in unauthorized access and data leaks. Using tools like Token Scanning can help mitigate these risks.

Related Concepts

Oauth Tokens
Cloud Service Security
Credential Management Best Practices