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