Wordpress 4.6-scripts

[autoinstalls/wordpress.git] / wp-includes / Requests / SSL.php

diff --git a/wp-includes/Requests/SSL.php b/wp-includes/Requests/SSL.php
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@@ -0,0 +1,152 @@
+<?php
+/**
+ * SSL utilities for Requests
+ *
+ * @package Requests
+ * @subpackage Utilities
+ */
+
+/**
+ * SSL utilities for Requests
+ *
+ * Collection of utilities for working with and verifying SSL certificates.
+ *
+ * @package Requests
+ * @subpackage Utilities
+ */
+class Requests_SSL {
+       /**
+        * Verify the certificate against common name and subject alternative names
+        *
+        * Unfortunately, PHP doesn't check the certificate against the alternative
+        * names, leading things like 'https://www.github.com/' to be invalid.
+        * Instead
+        *
+        * @see https://tools.ietf.org/html/rfc2818#section-3.1 RFC2818, Section 3.1
+        *
+        * @throws Requests_Exception On not obtaining a match for the host (`fsockopen.ssl.no_match`)
+        * @param string $host Host name to verify against
+        * @param array $cert Certificate data from openssl_x509_parse()
+        * @return bool
+        */
+       public static function verify_certificate($host, $cert) {
+               // Calculate the valid wildcard match if the host is not an IP address
+               $parts = explode('.', $host);
+               if (ip2long($host) === false) {
+                       $parts[0] = '*';
+               }
+               $wildcard = implode('.', $parts);
+
+               $has_dns_alt = false;
+
+               // Check the subjectAltName
+               if (!empty($cert['extensions']) && !empty($cert['extensions']['subjectAltName'])) {
+                       $altnames = explode(',', $cert['extensions']['subjectAltName']);
+                       foreach ($altnames as $altname) {
+                               $altname = trim($altname);
+                               if (strpos($altname, 'DNS:') !== 0) {
+                                       continue;
+                               }
+
+                               $has_dns_alt = true;
+
+                               // Strip the 'DNS:' prefix and trim whitespace
+                               $altname = trim(substr($altname, 4));
+
+                               // Check for a match
+                               if (self::match_domain($host, $altname) === true) {
+                                       return true;
+                               }
+                       }
+               }
+
+               // Fall back to checking the common name if we didn't get any dNSName
+               // alt names, as per RFC2818
+               if (!$has_dns_alt && !empty($cert['subject']['CN'])) {
+                       // Check for a match
+                       if (self::match_domain($host, $cert['subject']['CN']) === true) {
+                               return true;
+                       }
+               }
+
+               return false;
+       }
+
+       /**
+        * Verify that a reference name is valid
+        *
+        * Verifies a dNSName for HTTPS usage, (almost) as per Firefox's rules:
+        * - Wildcards can only occur in a name with more than 3 components
+        * - Wildcards can only occur as the last character in the first
+        *   component
+        * - Wildcards may be preceded by additional characters
+        *
+        * We modify these rules to be a bit stricter and only allow the wildcard
+        * character to be the full first component; that is, with the exclusion of
+        * the third rule.
+        *
+        * @param string $reference Reference dNSName
+        * @return boolean Is the name valid?
+        */
+       public static function verify_reference_name($reference) {
+               $parts = explode('.', $reference);
+
+               // Check the first part of the name
+               $first = array_shift($parts);
+
+               if (strpos($first, '*') !== false) {
+                       // Check that the wildcard is the full part
+                       if ($first !== '*') {
+                               return false;
+                       }
+
+                       // Check that we have at least 3 components (including first)
+                       if (count($parts) < 2) {
+                               return false;
+                       }
+               }
+
+               // Check the remaining parts
+               foreach ($parts as $part) {
+                       if (strpos($part, '*') !== false) {
+                               return false;
+                       }
+               }
+
+               // Nothing found, verified!
+               return true;
+       }
+
+       /**
+        * Match a hostname against a dNSName reference
+        *
+        * @param string $host Requested host
+        * @param string $reference dNSName to match against
+        * @return boolean Does the domain match?
+        */
+       public static function match_domain($host, $reference) {
+               // Check if the reference is blacklisted first
+               if (self::verify_reference_name($reference) !== true) {
+                       return false;
+               }
+
+               // Check for a direct match
+               if ($host === $reference) {
+                       return true;
+               }
+
+               // Calculate the valid wildcard match if the host is not an IP address
+               // Also validates that the host has 3 parts or more, as per Firefox's
+               // ruleset.
+               if (ip2long($host) === false) {
+                       $parts = explode('.', $host);
+                       $parts[0] = '*';
+                       $wildcard = implode('.', $parts);
+                       if ($wildcard === $reference) {
+                               return true;
+                       }
+               }
+
+               return false;
+       }
+}
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