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html/phpmyad/libraries/ip_allow_deny.lib.php

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+<?php
+/* vim: set expandtab sw=4 ts=4 sts=4: */
+/**
+ * This library is used with the server IP allow/deny host authentication
+ * feature
+ *
+ * @todo Broken for IPv6
+ *
+ * @package PhpMyAdmin
+ */
+
+
+/**
+ * Gets the "true" IP address of the current user
+ *
+ * @return  string   the ip of the user
+ *
+ * @access  private
+ */
+function PMA_getIp()
+{
+    /* Get the address of user */
+    if (!empty($_SERVER['REMOTE_ADDR'])) {
+        $direct_ip = $_SERVER['REMOTE_ADDR'];
+    } else {
+        /* We do not know remote IP */
+        return false;
+    }
+
+    /* Do we trust this IP as a proxy? If yes we will use it's header. */
+    if (isset($GLOBALS['cfg']['TrustedProxies'][$direct_ip])) {
+        $trusted_header_value = PMA_getenv($GLOBALS['cfg']['TrustedProxies'][$direct_ip]);
+        $matches = array();
+        // the $ checks that the header contains only one IP address, ?: makes sure the () don't capture
+        $is_ip = preg_match('|^(?:[0-9]{1,3}\.){3,3}[0-9]{1,3}$|', $trusted_header_value, $matches);
+        if ($is_ip && (count($matches) == 1)) {
+            // True IP behind a proxy
+            return $matches[0];
+        }
+    }
+
+    /* Return true IP */
+    return $direct_ip;
+} // end of the 'PMA_getIp()' function
+
+
+/**
+ * Based on IP Pattern Matcher
+ * Originally by J.Adams <jna@retina.net>
+ * Found on <http://www.php.net/manual/en/function.ip2long.php>
+ * Modified for phpMyAdmin
+ *
+ * Matches:
+ * xxx.xxx.xxx.xxx        (exact)
+ * xxx.xxx.xxx.[yyy-zzz]  (range)
+ * xxx.xxx.xxx.xxx/nn     (CIDR)
+ *
+ * Does not match:
+ * xxx.xxx.xxx.xx[yyy-zzz]  (range, partial octets not supported)
+ *
+ * @param string   string of IP range to match
+ * @param string   string of IP to test against range
+ *
+ * @return  boolean    always true
+ *
+ * @access  public
+ */
+function PMA_ipMaskTest($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 + PMA_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] = $rule_data[3];
+        }
+
+        // Handle shortcuts with above array
+        if (isset($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
+
+?>