Improved email address validation with IPv6 support

program/include/rcube_utils.php

@@ -92,9 +92,9 @@ class rcube_utils
             return false;
         }
 
-        // Check domain part
-        if (preg_match('/^\[*(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])(\.(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])){3}\]*$/', $domain_part)) {
-            return true; // IP address
+        // Validate domain part
+        if (preg_match('/^\[((IPv6:[0-9a-f:.]+)|([0-9.]+))\]$/i', $domain_part, $matches)) {
+            return self::ip_check(preg_replace('/^IPv6:/i', '', $matches[1])); // valid IPv4 or IPv6 address
         }
         else {
             // If not an IP address
@@ -146,6 +146,52 @@ class rcube_utils
         return false;
     }
 
+
+    /**
+     * Validates IPv4 or IPv6 address
+     *
+     * @param string $ip IP address in v4 or v6 format
+     *
+     * @return bool True if the address is valid
+     */
+    public static function ip_check($ip)
+    {
+        // IPv6, but there's no build-in IPv6 support
+        if (strpos($ip, ':') !== false && !defined('AF_INET6')) {
+            $parts = explode(':', $domain_part);
+            $count = count($parts);
+
+            if ($count > 8 || $count < 2) {
+                return false;
+            }
+
+            foreach ($parts as $idx => $part) {
+                $length = strlen($part);
+                if (!$length) {
+                    // there can be only one ::
+                    if ($found_empty) {
+                        return false;
+                    }
+                    $found_empty = true;
+                }
+                // last part can be an IPv4 address
+                else if ($idx == $count - 1) {
+                    if (!preg_match('/^[0-9a-f]{1,4}$/i', $part)) {
+                        return @inet_pton($part) !== false;
+                    }
+                }
+                else if (!preg_match('/^[0-9a-f]{1,4}$/i', $part)) {
+                    return false;
+                }
+            }
+
+            return true;
+        }
+
+        return @inet_pton($ip) !== false;
+    }
+
+
     /**
      * Check whether the HTTP referer matches the current request
      *

program/js/common.js

@@ -494,7 +494,9 @@ function rcube_check_email(input, inline)
       atom = '[^\\x00-\\x20\\x22\\x28\\x29\\x2c\\x2e\\x3a-\\x3c\\x3e\\x40\\x5b-\\x5d\\x7f-\\xff]+',
       quoted_pair = '\\x5c[\\x00-\\x7f]',
       quoted_string = '\\x22('+qtext+'|'+quoted_pair+')*\\x22',
-      ip_addr = '\\[*(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])(\.(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])){3}\\]*',
+      ipv4 = '\\[(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])(\.(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])){3}\\]',
+      ipv6 = '\\[IPv6:[0-9a-f:.]+\\]',
+      ip_addr = '(' + ipv4 + ')|(' + ipv6 + ')',
       // Use simplified domain matching, because we need to allow Unicode characters here
       // So, e-mail address should be validated also on server side after idn_to_ascii() use
       //domain_literal = '\\x5b('+dtext+'|'+quoted_pair+')*\\x5d',

tests/Utils.php

@@ -18,8 +18,10 @@ class Utils extends PHPUnit_Framework_TestCase
             array('firstname.lastname@domain.com', 'Email contains dot in the address field'),
             array('email@subdomain.domain.com', 'Email contains dot with subdomain'),
             array('firstname+lastname@domain.com', 'Plus sign is considered valid character'),
-            array('email@123.123.123.123', 'Domain is valid IP address'),
-            array('email@[123.123.123.123]', 'Square bracket around IP address is considered valid'),
+            array('email@[123.123.123.123]', 'Square bracket around IP address'),
+            array('email@[IPv6:::1]', 'Square bracket around IPv6 address (1)'),
+            array('email@[IPv6:::1.2.3.4]', 'Square bracket around IPv6 address (2)'),
+            array('email@[IPv6:2001:2d12:c4fe:5afe::1]', 'Square bracket around IPv6 address (3)'),
             array('"email"@domain.com', 'Quotes around email is considered valid'),
             array('1234567890@domain.com', 'Digits in address are valid'),
             array('email@domain-one.com', 'Dash in domain name is valid'),
@@ -50,7 +52,16 @@ class Utils extends PHPUnit_Framework_TestCase
             array('email@domain', 'Missing top level domain (.com/.net/.org/etc)'),
             array('email@-domain.com', 'Leading dash in front of domain is invalid'),
 //            array('email@domain.web', '.web is not a valid top level domain'),
-            array('email@111.222.333.44444', 'Invalid IP format'),
+            array('email@123.123.123.123', 'IP address without brackets'),
+            array('email@2001:2d12:c4fe:5afe::1', 'IPv6 address without brackets'),
+            array('email@IPv6:2001:2d12:c4fe:5afe::1', 'IPv6 address without brackets (2)'),
+            array('email@[111.222.333.44444]', 'Invalid IP format'),
+            array('email@[111.222.255.257]', 'Invalid IP format (2)'),
+            array('email@[.222.255.257]', 'Invalid IP format (3)'),
+            array('email@[::1]', 'Invalid IPv6 format (1)'),
+            array('email@[IPv6:2001:23x2:1]', 'Invalid IPv6 format (2)'),
+            array('email@[IPv6:1111:2222:33333::4444:5555]', 'Invalid IPv6 format (3)'),
+            array('email@[IPv6:1111::3333::4444:5555]', 'Invalid IPv6 format (4)'),
             array('email@domain..com', 'Multiple dot in the domain portion is invalid'),
         );
     }