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<?php
/* $Id: ip_allow_deny.lib.php,v 2.7.2.1 2006/04/11 16:33:33 cybot_tm Exp $ */
// vim: expandtab sw=4 ts=4 sts=4:
/**
* This library is used with the server IP allow/deny host authentication
* feature
*/
/**
* Gets the "true" IP address of the current user
*
* @return string the ip of the user
*
* @access private
*/
function PMA_getIp()
{
global $REMOTE_ADDR;
global $HTTP_X_FORWARDED_FOR, $HTTP_X_FORWARDED, $HTTP_FORWARDED_FOR, $HTTP_FORWARDED;
global $HTTP_VIA, $HTTP_X_COMING_FROM, $HTTP_COMING_FROM;
// Get some server/environment variables values
if (empty($REMOTE_ADDR) && PMA_getenv('REMOTE_ADDR')) {
$REMOTE_ADDR = PMA_getenv('REMOTE_ADDR');
}
if (empty($HTTP_X_FORWARDED_FOR) && PMA_getenv('HTTP_X_FORWARDED_FOR')) {
$HTTP_X_FORWARDED_FOR = PMA_getenv('HTTP_X_FORWARDED_FOR');
}
if (empty($HTTP_X_FORWARDED) && PMA_getenv('HTTP_X_FORWARDED')) {
$HTTP_X_FORWARDED = PMA_getenv('HTTP_X_FORWARDED');
}
if (empty($HTTP_FORWARDED_FOR) && PMA_getenv('HTTP_FORWARDED_FOR')) {
$HTTP_FORWARDED_FOR = PMA_getenv('HTTP_FORWARDED_FOR');
}
if (empty($HTTP_FORWARDED) && PMA_getenv('HTTP_FORWARDED')) {
$HTTP_FORWARDED = PMA_getenv('HTTP_FORWARDED');
}
if (empty($HTTP_VIA) && PMA_getenv('HTTP_VIA')) {
$HTTP_VIA = PMA_getenv('HTTP_VIA');
}
if (empty($HTTP_X_COMING_FROM) && PMA_getenv('HTTP_X_COMING_FROM')) {
$HTTP_X_COMING_FROM = PMA_getenv('HTTP_X_COMING_FROM');
}
if (empty($HTTP_COMING_FROM) && PMA_getenv('HTTP_COMING_FROM')) {
$HTTP_COMING_FROM = PMA_getenv('HTTP_COMING_FROM');
}
// Gets the default ip sent by the user
if (!empty($REMOTE_ADDR)) {
$direct_ip = $REMOTE_ADDR;
}
// Gets the proxy ip sent by the user
$proxy_ip = '';
if (!empty($HTTP_X_FORWARDED_FOR)) {
$proxy_ip = $HTTP_X_FORWARDED_FOR;
} elseif (!empty($HTTP_X_FORWARDED)) {
$proxy_ip = $HTTP_X_FORWARDED;
} elseif (!empty($HTTP_FORWARDED_FOR)) {
$proxy_ip = $HTTP_FORWARDED_FOR;
} elseif (!empty($HTTP_FORWARDED)) {
$proxy_ip = $HTTP_FORWARDED;
} elseif (!empty($HTTP_VIA)) {
$proxy_ip = $HTTP_VIA;
} elseif (!empty($HTTP_X_COMING_FROM)) {
$proxy_ip = $HTTP_X_COMING_FROM;
} elseif (!empty($HTTP_COMING_FROM)) {
$proxy_ip = $HTTP_COMING_FROM;
} // end if... elseif...
// Returns the true IP if it has been found, else FALSE
if (empty($proxy_ip)) {
// True IP without proxy
return $direct_ip;
} else {
$is_ip = preg_match('|^([0-9]{1,3}\.){3,3}[0-9]{1,3}|', $proxy_ip, $regs);
if ($is_ip && (count($regs) > 0)) {
// True IP behind a proxy
return $regs[0];
} else {
// Can't define IP: there is a proxy but we don't have
// information about the true IP
return FALSE;
}
} // end if... else...
} // end of the 'PMA_getIp()' function
/**
* Based on IP Pattern Matcher
* Originally by J.Adams <jna@retina.net>
* Found on <http://www.php.net/manual/en/function.ip2long.php>
* Modified by Robbat2 <robbat2@users.sourceforge.net>
*
* Matches:
* xxx.xxx.xxx.xxx (exact)
* xxx.xxx.xxx.[yyy-zzz] (range)
* xxx.xxx.xxx.xxx/nn (CIDR)
*
* Does not match:
* xxx.xxx.xxx.xx[yyy-zzz] (range, partial octets not supported)
*
* @param string string of IP range to match
* @param string string of IP to test against range
*
* @return boolean always true
*
* @access public
*/
function PMA_ipMaskTest($testRange, $ipToTest)
{
$result = TRUE;
if (preg_match('|([0-9]+)\.([0-9]+)\.([0-9]+)\.([0-9]+)/([0-9]+)|', $testRange, $regs)) {
// 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) {
$maskl = $maskl + pow(2, (30 - $i));
} // end if
} // end for
if (($maskl & $rangel) == ($maskl & $ipl)) {
return TRUE;
} else {
return FALSE;
}
} else {
// 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])) {
$result = FALSE;
} // end if
} else {
if ($maskocts[$i] <> $ipocts[$i]) {
$result = FALSE;
} // end if
} // end if/else
} //end for
} //end if/else
return $result;
} // end of the "PMA_IPMaskTest()" function
/**
* Runs through IP Allow/Deny rules the use of it below for more information
*
* @param string 'allow' | 'deny' type of rule to match
*
* @return bool Matched a rule ?
*
* @access public
*
* @see PMA_getIp()
*/
function PMA_allowDeny($type)
{
global $cfg;
// Grabs true IP of the user and returns if it can't be found
$remote_ip = PMA_getIp();
if (empty($remote_ip)) {
return FALSE;
}
// copy username
$username = $cfg['Server']['user'];
// copy rule database
$rules = $cfg['Server']['AllowDeny']['rules'];
// lookup table for some name shortcuts
$shortcuts = array(
'all' => '0.0.0.0/0',
'localhost' => '127.0.0.1/8'
);
// Provide some useful shortcuts if server gives us address:
if (PMA_getenv('SERVER_ADDR')) {
$shortcuts['localnetA'] = PMA_getenv('SERVER_ADDR') . '/8';
$shortcuts['localnetB'] = PMA_getenv('SERVER_ADDR') . '/16';
$shortcuts['localnetC'] = PMA_getenv('SERVER_ADDR') . '/24';
}
foreach ($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
&& ($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] = $rule_data[3];
}
// Handle shortcuts with above array
// DON'T use "array_key_exists" as it's only PHP 4.1 and newer.
if (isset($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 (PMA_ipMaskTest($rule_data[2], $remote_ip)) {
return TRUE;
}
} // end while
return FALSE;
} // end of the "PMA_AllowDeny()" function
?>
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