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Secure File Upload Methods: Protect Your System with Validation Filters

Learn about secure file upload methods, the importance of MIME types, using Fileinfo extension for file confirmation, preventing XSS attacks, and validation filters in PHP. Find out how to enhance security when handling file uploads.

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Secure File Upload Methods: Protect Your System with Validation Filters

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  1. Chapter 13 Security Methods Part 2

  2. File Uploads • “one cannot be too mindful of security when it come to handling them” • “it’s easy for a malicious user to trick the browser into providing a false MIME type.” • “A more reliable way of confirming a file’s type is to use the Fileinfo extension.”

  3. Magic Bytes • GIF – GIF89a or GIF87a • PDF - %PDF

  4. upload_rtf.php • Script 13.3 on pages 415-6 • http://cscdb.nku.edu/csc301/frank/ch13/upload_rtf.php • ch13\upload_rtf.php • ch13\Assignment22.rtf • Why PHP Version 5.3.5?

  5. xss.php • Script 13.4 on page 419 • http://cscdb.nku.edu/csc301/frank/ch13/xss.php • ch13\xss.php • Enter <script>alert(“Ha!”);</script>

  6. XSS Attacks • It could create a pop-up window • Steal cookies • Redirect the browser to other sites.

  7. htmlentities() • Turn problem characters into HTML entities (taken literally. No special meaning.) • & -> &amp; • “ -> &quot; • < -> &lt; • > -> &gt;

  8. strip_tags() • Removes all HTML and PHP tags

  9. calculator.php • Script 13.4 on pages 422-423 • http://cscdb.nku.edu/csc301/frank/ch13/calculator.php • ch13\calculator.php

  10. filter_var() if(filter_var($var,FILTER_VALIDATE_INT) if(filter_var($var,FILTER_VALIDATE_INT, array(‘min_range’ => 1, ‘max_range’ => 120))

  11. Validation Filters • FILTER_VALIDATE_EMAIL • FILTER_VALIDATE_FLOAT • FILTER_VALIDATE_INT • FILTER_VALIDATE_URL

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