File Upload Security in PHP and Laravel - The File That Isn't What It Claims to Be

The article "File Upload Security in PHP and Laravel — The File That Isn’t What It Claims to Be" provides a comprehensive guide on how to handle file uploads securely in both plain PHP and Laravel frameworks. Here's a summary of key points:

Key Points for Secure File Handling

General Principles:

1. Validate MIME Type: Use finfo instead of relying on the browser-provided MIME type.
2. Whitelist Extensions: Validate against a whitelist of allowed file extensions.
3. Image Validation: For images, use getimagesize() to validate the content.
4. Rename Files: Generate unique filenames for uploaded files.
5. Store Outside Web Root: Store uploaded files outside the web root directory.
6. Prevent PHP Execution: Ensure that directories storing uploads do not allow PHP execution.
7. Enforce Size Limits: Set file size limits both at the application level and in php.ini.
8. Sanitize Paths: Use functions like basename() to prevent path traversal attacks.

Laravel-Specific Practices:

1. Validation Rules:
   • Use image rule for image validation.
   • Use mimes rule to validate file types.

Read the full article at System Weakness - Medium

---

Want to create content about this topic? Use Nemati AI tools to generate articles, social posts, and more.