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Writing Secure Rust Code with SAST

In software development, security is not optional; it's a critical necessity. Even when using a memory-safe language like Rust, you must constantly ensure that your code is as secure as possible. This is where Static Application Security Testing (SAST) steps in, bringing a powerful suite of tools to aid in the ongoing battle against security vulnerabilities. In this blog post, we'll explore how SAST can bolster the security of your Rust code and why static analysis is an essential facet of Rust programming.

What is SAST

Before diving into the Rust-specific aspects, it's essential to understand what Static Application Security Testing (SAST) is. SAST is a testing methodology that analyzes source code to identify potential security vulnerabilities. It's done statically, meaning it happens without actually executing the code. This allows SAST tools to spot problems early in the development cycle, typically as soon as the code is written or committed.

Why is SAST important for Rust?

Rust is a powerful language designed with memory safety in mind, which significantly reduces a broad class of security vulnerabilities. However, like any other language, it isn't foolproof. Mistakes can be made, and secure coding practices can sometimes be overlooked. This is where SAST becomes invaluable.

Even though Rust's design helps prevent memory corruption bugs, it does not automatically prevent logical bugs or issues like data races in concurrent code. SAST can help find these and other issues, such as unsafe code blocks, incorrect use of cryptography, potential SQL injections, and more.

How can SAST help secure your Rust code?

1. Early detection of vulnerabilities: SAST tools can detect potential security vulnerabilities early in development. They scan the source code, looking for patterns associated with known security risks. Early detection is beneficial because it's generally cheaper and easier to fix issues at this stage than after the code has been deployed.

2. Automation of code reviews: While manual code reviews are a great way to spot potential problems, they can be time-consuming and subject to human error. Automating this process ensures that every line of code is analyzed and nothing falls through the cracks. 

3. Enforcing secure coding practices: SAST tools can be configured to enforce secure coding practices. For instance, they can be set up to raise an alert whenever a pull request contains changes that don't adhere to these practices, helping ensure that only secure code makes it into your codebase.


While Rust is designed with memory safety in mind, it's not immune to security vulnerabilities. As with any other programming language, secure coding practices are a must. While SAST is a powerful tool, it's not a silver bullet solution to ensuring secure code. It should be used with other security practices, such as manual code reviews, Dynamic Application Security Testing (DAST), and penetration testing. It's also important that your engineering team understands the output of SAST tools and how to respond to the detected vulnerabilities. Regular training sessions can ensure that your team is up-to-date on the latest threats and mitigation techniques.

This is where DeepSource shines, offering the most advanced static analysis and SAST capabilities available for Rust in the industry. It takes less than 5 minutes to get started and analyze your Rust code base, and you get insights from 240+ checks across not just security but categories like performance, anti-patterns, and bug risks. Get started with DeepSource for free, or contact us for a personalized demo.

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