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<?php if (!defined('WFWAF_RUN_COMPLETE')) { /** * */ class wfWAFUserIPRange { /** * @var string|null */ private $ip_string; /** * @param string|null $ip_string */ public function __construct($ip_string = null) { $this->setIPString($ip_string); } public function isIPInRange($ip) { $ip_string = $this->getIPString(); if (strpos($ip_string, '/') !== false) { //CIDR range -- 127.0.0.1/24 return wfWAFUtils::subnetContainsIP($ip_string, $ip); } else if (strpos($ip_string, '[') !== false) //Bracketed range -- 127.0.0.[1-100] { // IPv4 range if (strpos($ip_string, '.') !== false && strpos($ip, '.') !== false) { // IPv4-mapped-IPv6 if (preg_match('/:ffff:([^:]+)$/i', $ip_string, $matches)) { $ip_string = $matches[1]; } if (preg_match('/:ffff:([^:]+)$/i', $ip, $matches)) { $ip = $matches[1]; } // Range check if (preg_match('/\[\d+\-\d+\]/', $ip_string)) { $IPparts = explode('.', $ip); $whiteParts = explode('.', $ip_string); $mismatch = false; if (count($whiteParts) != 4 || count($IPparts) != 4) { return false; } for ($i = 0; $i <= 3; $i++) { if (preg_match('/^\[(\d+)\-(\d+)\]$/', $whiteParts[$i], $m)) { if ($IPparts[$i] < $m[1] || $IPparts[$i] > $m[2]) { $mismatch = true; } } else if ($whiteParts[$i] != $IPparts[$i]) { $mismatch = true; } } if ($mismatch === false) { return true; // Is whitelisted because we did not get a mismatch } } else if ($ip_string == $ip) { return true; } // IPv6 range } else if (strpos($ip_string, ':') !== false && strpos($ip, ':') !== false) { $ip = strtolower(wfWAFUtils::expandIPv6Address($ip)); $ip_string = strtolower(self::expandIPv6Range($ip_string)); if (preg_match('/\[[a-f0-9]+\-[a-f0-9]+\]/i', $ip_string)) { $IPparts = explode(':', $ip); $whiteParts = explode(':', $ip_string); $mismatch = false; if (count($whiteParts) != 8 || count($IPparts) != 8) { return false; } for ($i = 0; $i <= 7; $i++) { if (preg_match('/^\[([a-f0-9]+)\-([a-f0-9]+)\]$/i', $whiteParts[$i], $m)) { $ip_group = hexdec($IPparts[$i]); $range_group_from = hexdec($m[1]); $range_group_to = hexdec($m[2]); if ($ip_group < $range_group_from || $ip_group > $range_group_to) { $mismatch = true; break; } } else if ($whiteParts[$i] != $IPparts[$i]) { $mismatch = true; break; } } if ($mismatch === false) { return true; // Is whitelisted because we did not get a mismatch } } else if ($ip_string == $ip) { return true; } } } else if (strpos($ip_string, '-') !== false) { //Linear range -- 127.0.0.1 - 127.0.1.100 list($ip1, $ip2) = explode('-', $ip_string); $ip1N = wfWAFUtils::inet_pton($ip1); $ip2N = wfWAFUtils::inet_pton($ip2); $ipN = wfWAFUtils::inet_pton($ip); return (strcmp($ip1N, $ipN) <= 0 && strcmp($ip2N, $ipN) >= 0); } else { //Treat as a literal IP $ip1 = @wfWAFUtils::inet_pton($ip_string); $ip2 = @wfWAFUtils::inet_pton($ip); if ($ip1 !== false && $ip1 == $ip2) { return true; } } return false; } private static function repeatString($string, $count) { if ($count <= 0) return ''; return str_repeat($string, $count); } /** * Expand a compressed printable range representation of an IPv6 address. * * @todo Hook up exceptions for better error handling. * @todo Allow IPv4 mapped IPv6 addresses (::ffff:192.168.1.1). * @param string $ip_range * @return string */ public static function expandIPv6Range($ip_range) { $colon_count = substr_count($ip_range, ':'); $dbl_colon_count = substr_count($ip_range, '::'); if ($dbl_colon_count > 1) { return false; } $dbl_colon_pos = strpos($ip_range, '::'); if ($dbl_colon_pos !== false) { $ip_range = str_replace('::', self::repeatString(':0000', (($dbl_colon_pos === 0 || $dbl_colon_pos === strlen($ip_range) - 2) ? 9 : 8) - $colon_count) . ':', $ip_range); $ip_range = trim($ip_range, ':'); } $colon_count = substr_count($ip_range, ':'); if ($colon_count != 7) { return false; } $groups = explode(':', $ip_range); $expanded = ''; foreach ($groups as $group) { if (preg_match('/\[([a-f0-9]{1,4})\-([a-f0-9]{1,4})\]/i', $group, $matches)) { $expanded .= sprintf('[%s-%s]', str_pad(strtolower($matches[1]), 4, '0', STR_PAD_LEFT), str_pad(strtolower($matches[2]), 4, '0', STR_PAD_LEFT)) . ':'; } else if (preg_match('/[a-f0-9]{1,4}/i', $group)) { $expanded .= str_pad(strtolower($group), 4, '0', STR_PAD_LEFT) . ':'; } else { return false; } } return trim($expanded, ':'); } /** * @return bool */ public function isValidRange() { return $this->isValidCIDRRange() || $this->isValidBracketedRange() || $this->isValidLinearRange() || filter_var($this->getIPString(), FILTER_VALIDATE_IP) !== false; } public function isValidCIDRRange() { //e.g., 192.0.2.1/24 $ip_string = $this->getIPString(); if (preg_match('/[^0-9a-f:\/\.]/i', $ip_string)) { return false; } $components = explode('/', $ip_string); if (count($components) != 2) { return false; } list($ip, $prefix) = $components; if (filter_var($ip, FILTER_VALIDATE_IP) === false) { return false; } if (!preg_match('/^\d+$/', $prefix)) { return false; } if (filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4)) { if ($prefix < 0 || $prefix > 32) { return false; } } else { if ($prefix < 1 || $prefix > 128) { return false; } } return true; } public function isValidBracketedRange() { //e.g., 192.0.2.[1-10] $ip_string = $this->getIPString(); if (preg_match('/[^0-9a-f:\.\[\]\-]/i', $ip_string)) { return false; } if (strpos($ip_string, '.') !== false) { //IPv4 if (preg_match_all('/(\d+)/', $ip_string, $matches) > 0) { foreach ($matches[1] as $match) { $group = (int) $match; if ($group > 255 || $group < 0) { return false; } } } $group_regex = '([0-9]{1,3}|\[[0-9]{1,3}\-[0-9]{1,3}\])'; return preg_match('/^' . str_repeat("{$group_regex}\\.", 3) . $group_regex . '$/i', $ip_string) > 0; } //IPv6 if (strpos($ip_string, '::') !== false) { $ip_string = self::expandIPv6Range($ip_string); } if (!$ip_string) { return false; } $group_regex = '([a-f0-9]{1,4}|\[[a-f0-9]{1,4}\-[a-f0-9]{1,4}\])'; return preg_match('/^' . str_repeat("$group_regex:", 7) . $group_regex . '$/i', $ip_string) > 0; } public function isValidLinearRange() { //e.g., 192.0.2.1-192.0.2.100 $ip_string = $this->getIPString(); if (preg_match('/[^0-9a-f:\.\-]/i', $ip_string)) { return false; } list($ip1, $ip2) = explode("-", $ip_string); $ip1N = @wfWAFUtils::inet_pton($ip1); $ip2N = @wfWAFUtils::inet_pton($ip2); if ($ip1N === false || filter_var($ip1, FILTER_VALIDATE_IP) === false || $ip2N === false || filter_var($ip2, FILTER_VALIDATE_IP) === false) { return false; } return strcmp($ip1N, $ip2N) <= 0; } protected function _sanitizeIPRange($ip_string) { $ip_string = preg_replace('/\s/', '', $ip_string); //Strip whitespace $ip_string = preg_replace('/[\\x{2013}-\\x{2015}]/u', '-', $ip_string); //Non-hyphen dashes to hyphen $ip_string = strtolower($ip_string); if (preg_match('/^\d+-\d+$/', $ip_string)) { //v5 32 bit int style format list($start, $end) = explode('-', $ip_string); $start = long2ip($start); $end = long2ip($end); $ip_string = "{$start}-{$end}"; } return $ip_string; } /** * @return string|null */ public function getIPString() { return $this->ip_string; } /** * @param string|null $ip_string */ public function setIPString($ip_string) { $this->ip_string = $this->_sanitizeIPRange($ip_string); } } }
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