Verify certificates during SSL/TLS connections

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Metadata

ID: php-security/curl-certificate-verification

Language: PHP

Severity: Error

Category: Security

CWE: 295

Description

The rule requires that all SSL or TLS connections made in PHP must undergo certificate verification. This is a security measure designed to prevent man-in-the-middle attacks, where an attacker intercepts and possibly alters the communication between two parties who believe they are directly communicating with each other.

If certificate verification is not performed, it opens up the possibility for these types of attacks. This can lead to data breaches, loss of sensitive information, and other security issues. Therefore, it is crucial to ensure that all SSL or TLS connections have certificate verification enabled.

In PHP, this can be achieved by using the curl_setopt function with the CURLOPT_SSL_VERIFYPEER option set to true. This tells the cURL library to verify the peer’s certificate. By default, this option is set to true, so if it’s not explicitly set in your code, cURL will verify the certificate. Avoid setting CURLOPT_SSL_VERIFYPEER to false as this disables certificate verification.

Non-Compliant Code Examples

<?php
$curl = curl_init();
curl_setopt($curl, CURLOPT_URL, 'https://domain.tld/');
curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false); // Not compliant
curl_exec($curl);
curl_close($curl);

Compliant Code Examples

<?php
$curl = curl_init();
curl_setopt($curl, CURLOPT_URL, 'https://domain.tld/');
curl_exec($curl);
curl_close($curl);