Update proxy-xml.php #269
Update proxy-xml.php #269
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Security improvement
for more information, see https://pre-commit.ci
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@alanEG Thanks for your initial contribution. I had to do something like this because of cors. Actually, this code doesn't do anything. But I don't believe there should be any security for this. |
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Hi, I added the whitelist to prevent SSRF and file system access via |
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Pull Request Overview
This PR implements security improvements to the XML proxy by adding URL validation and whitelisting functionality to prevent potential SSRF (Server-Side Request Forgery) attacks.
- Introduces a whitelist-based approach to restrict allowed domains
- Adds URL safety validation function that checks both hostname and IP address against the whitelist
- Replaces direct URL validation with comprehensive security checks
Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.
proxy-xml.php
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| return true; | ||
| } | ||
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| $ip = gethostbyname($host); |
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The gethostbyname() function can be exploited for DNS rebinding attacks and may resolve to internal IP addresses. Consider using a more secure approach that validates against private IP ranges (127.0.0.0/8, 10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16) and blocks localhost resolution.
proxy-xml.php
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| if (is_url_safe($url, $whitelist)) { | ||
| $response = file_get_contents($url); | ||
| header('Content-Type: application/xml'); | ||
| echo $response; |
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Using file_get_contents() without timeout or context options can lead to denial of service attacks through slow responses or large file downloads. Consider adding a stream context with timeout and size limits, or use cURL with proper configuration.
| echo $response; | |
| // Set a timeout of 5 seconds | |
| $context = stream_context_create([ | |
| 'http' => [ | |
| 'timeout' => 5 | |
| ] | |
| ]); | |
| // Limit response size to 2MB | |
| $maxSize = 2 * 1024 * 1024; // 2MB | |
| $response = ''; | |
| $handle = @fopen($url, 'r', false, $context); | |
| if ($handle) { | |
| while (!feof($handle) && strlen($response) < $maxSize) { | |
| $response .= fread($handle, 8192); | |
| } | |
| fclose($handle); | |
| if (strlen($response) >= $maxSize) { | |
| header('HTTP/1.1 413 Payload Too Large'); | |
| echo "Response too large"; | |
| } else { | |
| header('Content-Type: application/xml'); | |
| echo $response; | |
| } | |
| } else { | |
| header('HTTP/1.1 502 Bad Gateway'); | |
| echo "Failed to fetch URL"; | |
| } |
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is this good to go? |
Co-authored-by: Copilot <[email protected]>
Enhanced URL safety checks by validating the scheme and added error handling for missing URLs.
for more information, see https://pre-commit.ci
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Hey @maxwxyz, Yeah, I made a few changes, and I would say it’s looking good to go. |
3 participants
Security improvement