SafeLine: A Decade of Innovation in Web Security Defense

SafeLine, developed by Chaitin Tech over the past 10 years, is a cutting-edge Web Application Firewall (WAF) that leverages advanced semantic analysis algorithms to deliver exceptional protection against online threats. With its strong reputation in professional cybersecurity circles, SafeLine has become a trusted choice for securing websites.

The SafeLine Community Edition is an offshoot of the enterprise-level Ray Shield product. It strips away the complex features designed for large enterprises, making it more accessible to a broader audience. With reduced hardware requirements and simplified usage, SafeLine is now available as a free WAF solution tailored for community use.

Official Website: https://waf.chaitin.com/

GitHub Repository: https://github.com/chaitin/SafeLine

Dynamic Protection: Safeguarding Your Website

Dynamic protection in SafeLine adds a layer of security to web pages by introducing dynamic characteristics while keeping the content unchanged from the user's perspective. This feature ensures that even static pages are protected by dynamic encryption, making them resistant to a wide range of threats.

As a reverse proxy, SafeLine dynamically encrypts all web code passing through it. This dynamic protection offers several key benefits:

• Protecting the privacy of front-end code
• Blocking web crawlers
• Preventing vulnerability scanning
• Thwarting exploit attempts

Example: Dynamic Protection for HTML

The following image shows what a typical HTML page looks like before dynamic protection.

After SafeLine's dynamic protection is applied, the HTML code is encrypted and appears as follows:

Example: Dynamic Protection for JavaScript

Below is an example of what JavaScript code might look like before applying dynamic protection.

After passing through SafeLine's dynamic protection, the JavaScript code is encrypted, as shown below:

With dynamic protection enabled, the HTML and JavaScript code on your website will be dynamically encrypted, changing randomly with each visit. This significantly hinders the ability of crawlers and automated attack tools to exploit your site.

Example: Blocking Crawlers

Consider a scenario where a crawler is designed to scrape critical information from your website. The typical approach would involve:

1. Identifying web pages containing the target information (e.g., http://ct.cn/info?id=666)
2. Sending automated requests to retrieve the content
3. Parsing the HTML structure to extract key information
4. Iterating through IDs to gather more data

When dynamic protection is enabled, the structure of the web pages is randomized, preventing the crawler from functioning effectively.

Example: Defending Against Vulnerability Scanners

Now, let's examine how SafeLine defends against web vulnerability scanners, which usually operate by:

1. Checking for SQL injection by comparing responses to 1=1 and 1=2 conditions.
2. Detecting Remote Code Execution (RCE) by looking for specific characters in the web page's response.
3. Identifying information disclosure by searching for error messages or sensitive data.
4. Brute-forcing logins by analyzing the consistency of responses for successful and failed attempts.

With dynamic protection in place, the web page's response content is dynamically encrypted on each visit. This disrupts the scanner's logic and prevents it from accurately identifying vulnerabilities.