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<?php
/**
* This library is used with the server IP allow/deny host authentication
* feature
*/
declare(strict_types=1);
namespace PhpMyAdmin;
use function bin2hex;
use function dechex;
use function explode;
use function hash_equals;
use function hexdec;
use function inet_pton;
use function ip2long;
use function is_array;
use function mb_strpos;
use function mb_strtolower;
use function mb_substr;
use function min;
use function preg_match;
use function str_replace;
use function substr_replace;
/**
* PhpMyAdmin\IpAllowDeny class
*/
class IpAllowDeny
{
/**
* Matches for IPv4 or IPv6 addresses
*
* @param string $testRange string of IP range to match
* @param string $ipToTest string of IP to test against range
*/
public function ipMaskTest($testRange, $ipToTest): bool
{
if (mb_strpos($testRange, ':') > -1 || mb_strpos($ipToTest, ':') > -1) {
// assume IPv6
$result = $this->ipv6MaskTest($testRange, $ipToTest);
} else {
$result = $this->ipv4MaskTest($testRange, $ipToTest);
}
return $result;
}
/**
* Based on IP Pattern Matcher
* Originally by J.Adams <jna@retina.net>
* Found on <https://www.php.net/manual/en/function.ip2long.php>
* Modified for phpMyAdmin
*
* Matches:
* xxx.xxx.xxx.xxx (exact)
* xxx.xxx.xxx.[yyy-zzz] (range)
* xxx.xxx.xxx.xxx/nn (CIDR)
*
* Does not match:
* xxx.xxx.xxx.xx[yyy-zzz] (range, partial octets not supported)
*
* @param string $testRange string of IP range to match
* @param string $ipToTest string of IP to test against range
*/
public function ipv4MaskTest($testRange, $ipToTest): bool
{
$result = true;
$match = preg_match('|([0-9]+)\.([0-9]+)\.([0-9]+)\.([0-9]+)/([0-9]+)|', $testRange, $regs);
if ($match) {
// performs a mask match
$ipl = ip2long($ipToTest);
$rangel = ip2long($regs[1] . '.' . $regs[2] . '.' . $regs[3] . '.' . $regs[4]);
$maskl = 0;
for ($i = 0; $i < 31; $i++) {
if ($i >= $regs[5] - 1) {
continue;
}
$maskl += 2 ** (30 - $i);
}
return ($maskl & $rangel) == ($maskl & $ipl);
}
// range based
$maskocts = explode('.', $testRange);
$ipocts = explode('.', $ipToTest);
// perform a range match
for ($i = 0; $i < 4; $i++) {
if (preg_match('|\[([0-9]+)\-([0-9]+)\]|', $maskocts[$i], $regs)) {
if (($ipocts[$i] > $regs[2]) || ($ipocts[$i] < $regs[1])) {
$result = false;
}
} else {
if ($maskocts[$i] <> $ipocts[$i]) {
$result = false;
}
}
}
return $result;
}
/**
* IPv6 matcher
* CIDR section taken from https://stackoverflow.com/a/10086404
* Modified for phpMyAdmin
*
* Matches:
* xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx
* (exact)
* xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:[yyyy-zzzz]
* (range, only at end of IP - no subnets)
* xxxx:xxxx:xxxx:xxxx/nn
* (CIDR)
*
* Does not match:
* xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xx[yyy-zzz]
* (range, partial octets not supported)
*
* @param string $test_range string of IP range to match
* @param string $ip_to_test string of IP to test against range
*/
public function ipv6MaskTest($test_range, $ip_to_test): bool
{
$result = true;
// convert to lowercase for easier comparison
$test_range = mb_strtolower($test_range);
$ip_to_test = mb_strtolower($ip_to_test);
$is_cidr = mb_strpos($test_range, '/') > -1;
$is_range = mb_strpos($test_range, '[') > -1;
$is_single = ! $is_cidr && ! $is_range;
$ip_hex = bin2hex((string) inet_pton($ip_to_test));
if ($is_single) {
$range_hex = bin2hex((string) inet_pton($test_range));
return hash_equals($ip_hex, $range_hex);
}
if ($is_range) {
// what range do we operate on?
$range_match = [];
$match = preg_match('/\[([0-9a-f]+)\-([0-9a-f]+)\]/', $test_range, $range_match);
if ($match) {
$range_start = $range_match[1];
$range_end = $range_match[2];
// get the first and last allowed IPs
$first_ip = str_replace($range_match[0], $range_start, $test_range);
$first_hex = bin2hex((string) inet_pton($first_ip));
$last_ip = str_replace($range_match[0], $range_end, $test_range);
$last_hex = bin2hex((string) inet_pton($last_ip));
// check if the IP to test is within the range
$result = ($ip_hex >= $first_hex && $ip_hex <= $last_hex);
}
return $result;
}
if ($is_cidr) {
// Split in address and prefix length
[$first_ip, $subnet] = explode('/', $test_range);
// Parse the address into a binary string
$first_bin = inet_pton($first_ip);
$first_hex = bin2hex((string) $first_bin);
$flexbits = 128 - (int) $subnet;
// Build the hexadecimal string of the last address
$last_hex = $first_hex;
$pos = 31;
while ($flexbits > 0) {
// Get the character at this position
$orig = mb_substr($last_hex, $pos, 1);
// Convert it to an integer
$origval = hexdec($orig);
// OR it with (2^flexbits)-1, with flexbits limited to 4 at a time
$newval = $origval | 2 ** min(4, $flexbits) - 1;
// Convert it back to a hexadecimal character
$new = dechex($newval);
// And put that character back in the string
$last_hex = substr_replace($last_hex, $new, $pos, 1);
// We processed one nibble, move to previous position
$flexbits -= 4;
--$pos;
}
// check if the IP to test is within the range
$result = ($ip_hex >= $first_hex && $ip_hex <= $last_hex);
}
return $result;
}
/**
* Runs through IP Allow rules the use of it below for more information
*
* @see Core::getIp()
*/
public function allow(): bool
{
return $this->allowDeny('allow');
}
/**
* Runs through IP Deny rules the use of it below for more information
*
* @see Core::getIp()
*/
public function deny(): bool
{
return $this->allowDeny('deny');
}
/**
* Runs through IP Allow/Deny rules the use of it below for more information
*
* @see Core::getIp()
*
* @param string $type 'allow' | 'deny' type of rule to match
*/
private function allowDeny($type): bool
{
global $cfg;
// Grabs true IP of the user and returns if it can't be found
$remote_ip = Core::getIp();
if (empty($remote_ip)) {
return false;
}
// copy username
$username = $cfg['Server']['user'];
// copy rule database
if (isset($cfg['Server']['AllowDeny']['rules'])) {
$rules = $cfg['Server']['AllowDeny']['rules'];
if (! is_array($rules)) {
$rules = [];
}
} else {
$rules = [];
}
// lookup table for some name shortcuts
$shortcuts = [
'all' => '0.0.0.0/0',
'localhost' => '127.0.0.1/8',
];
// Provide some useful shortcuts if server gives us address:
if (Core::getenv('SERVER_ADDR')) {
$shortcuts['localnetA'] = Core::getenv('SERVER_ADDR') . '/8';
$shortcuts['localnetB'] = Core::getenv('SERVER_ADDR') . '/16';
$shortcuts['localnetC'] = Core::getenv('SERVER_ADDR') . '/24';
}
foreach ($rules as $rule) {
// extract rule data
$rule_data = explode(' ', $rule);
// check for rule type
if ($rule_data[0] != $type) {
continue;
}
// check for username
if (
($rule_data[1] !== '%') //wildcarded first
&& (! hash_equals($rule_data[1], $username))
) {
continue;
}
// check if the config file has the full string with an extra
// 'from' in it and if it does, just discard it
if ($rule_data[2] === 'from') {
$rule_data[2] = $rule_data[3];
}
// Handle shortcuts with above array
if (isset($shortcuts[$rule_data[2]])) {
$rule_data[2] = $shortcuts[$rule_data[2]];
}
// Add code for host lookups here
// Excluded for the moment
// Do the actual matching now
if ($this->ipMaskTest($rule_data[2], $remote_ip)) {
return true;
}
}
return false;
}
}