forked from GNUsocial/gnu-social
573 lines
23 KiB
PHP
573 lines
23 KiB
PHP
<?php
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/* vim: set expandtab tabstop=4 shiftwidth=4: */
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/**
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* File containing the Net_LDAP2_Util interface class.
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*
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* PHP version 5
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*
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* @category Net
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* @package Net_LDAP2
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* @author Benedikt Hallinger <beni@php.net>
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* @copyright 2009 Benedikt Hallinger
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* @license http://www.gnu.org/licenses/lgpl-3.0.txt LGPLv3
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* @version SVN: $Id: Util.php 286718 2009-08-03 07:30:49Z beni $
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* @link http://pear.php.net/package/Net_LDAP2/
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*/
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/**
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* Includes
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*/
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require_once 'PEAR.php';
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/**
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* Utility Class for Net_LDAP2
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*
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* This class servers some functionality to the other classes of Net_LDAP2 but most of
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* the methods can be used separately as well.
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*
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* @category Net
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* @package Net_LDAP2
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* @author Benedikt Hallinger <beni@php.net>
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* @license http://www.gnu.org/copyleft/lesser.html LGPL
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* @link http://pear.php.net/package/Net_LDAP22/
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*/
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class Net_LDAP2_Util extends PEAR
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{
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/**
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* Constructor
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*
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* @access public
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*/
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public function __construct()
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{
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// We do nothing here, since all methods can be called statically.
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// In Net_LDAP <= 0.7, we needed a instance of Util, because
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// it was possible to do utf8 encoding and decoding, but this
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// has been moved to the LDAP class. The constructor remains only
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// here to document the downward compatibility of creating an instance.
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}
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/**
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* Explodes the given DN into its elements
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*
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* {@link http://www.ietf.org/rfc/rfc2253.txt RFC 2253} says, a Distinguished Name is a sequence
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* of Relative Distinguished Names (RDNs), which themselves
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* are sets of Attributes. For each RDN a array is constructed where the RDN part is stored.
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*
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* For example, the DN 'OU=Sales+CN=J. Smith,DC=example,DC=net' is exploded to:
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* <kbd>array( [0] => array([0] => 'OU=Sales', [1] => 'CN=J. Smith'), [2] => 'DC=example', [3] => 'DC=net' )</kbd>
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*
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* [NOT IMPLEMENTED] DNs might also contain values, which are the bytes of the BER encoding of
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* the X.500 AttributeValue rather than some LDAP string syntax. These values are hex-encoded
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* and prefixed with a #. To distinguish such BER values, ldap_explode_dn uses references to
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* the actual values, e.g. '1.3.6.1.4.1.1466.0=#04024869,DC=example,DC=com' is exploded to:
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* [ { '1.3.6.1.4.1.1466.0' => "\004\002Hi" }, { 'DC' => 'example' }, { 'DC' => 'com' } ];
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* See {@link http://www.vijaymukhi.com/vmis/berldap.htm} for more information on BER.
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*
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* It also performs the following operations on the given DN:
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* - Unescape "\" followed by ",", "+", """, "\", "<", ">", ";", "#", "=", " ", or a hexpair
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* and strings beginning with "#".
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* - Removes the leading 'OID.' characters if the type is an OID instead of a name.
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* - If an RDN contains multiple parts, the parts are re-ordered so that the attribute type names are in alphabetical order.
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*
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* OPTIONS is a list of name/value pairs, valid options are:
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* casefold Controls case folding of attribute types names.
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* Attribute values are not affected by this option.
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* The default is to uppercase. Valid values are:
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* lower Lowercase attribute types names.
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* upper Uppercase attribute type names. This is the default.
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* none Do not change attribute type names.
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* reverse If TRUE, the RDN sequence is reversed.
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* onlyvalues If TRUE, then only attributes values are returned ('foo' instead of 'cn=foo')
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*
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* @param string $dn The DN that should be exploded
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* @param array $options Options to use
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*
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* @static
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* @return array Parts of the exploded DN
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* @todo implement BER
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*/
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public static function ldap_explode_dn($dn, $options = array('casefold' => 'upper'))
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{
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if (!isset($options['onlyvalues'])) $options['onlyvalues'] = false;
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if (!isset($options['reverse'])) $options['reverse'] = false;
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if (!isset($options['casefold'])) $options['casefold'] = 'upper';
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// Escaping of DN and stripping of "OID."
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$dn = self::canonical_dn($dn, array('casefold' => $options['casefold']));
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// splitting the DN
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$dn_array = preg_split('/(?<=[^\\\\]),/', $dn);
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// clear wrong splitting (possibly we have split too much)
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// /!\ Not clear, if this is neccessary here
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//$dn_array = self::correct_dn_splitting($dn_array, ',');
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// construct subarrays for multivalued RDNs and unescape DN value
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// also convert to output format and apply casefolding
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foreach ($dn_array as $key => $value) {
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$value_u = self::unescape_dn_value($value);
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$rdns = self::split_rdn_multival($value_u[0]);
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if (count($rdns) > 1) {
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// MV RDN!
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foreach ($rdns as $subrdn_k => $subrdn_v) {
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// Casefolding
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if ($options['casefold'] == 'upper') $subrdn_v = preg_replace("/^(\w+=)/e", "''.strtoupper('\\1').''", $subrdn_v);
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if ($options['casefold'] == 'lower') $subrdn_v = preg_replace("/^(\w+=)/e", "''.strtolower('\\1').''", $subrdn_v);
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if ($options['onlyvalues']) {
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preg_match('/(.+?)(?<!\\\\)=(.+)/', $subrdn_v, $matches);
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$rdn_ocl = $matches[1];
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$rdn_val = $matches[2];
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$unescaped = self::unescape_dn_value($rdn_val);
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$rdns[$subrdn_k] = $unescaped[0];
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} else {
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$unescaped = self::unescape_dn_value($subrdn_v);
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$rdns[$subrdn_k] = $unescaped[0];
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}
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}
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$dn_array[$key] = $rdns;
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} else {
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// normal RDN
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// Casefolding
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if ($options['casefold'] == 'upper') $value = preg_replace("/^(\w+=)/e", "''.strtoupper('\\1').''", $value);
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if ($options['casefold'] == 'lower') $value = preg_replace("/^(\w+=)/e", "''.strtolower('\\1').''", $value);
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if ($options['onlyvalues']) {
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preg_match('/(.+?)(?<!\\\\)=(.+)/', $value, $matches);
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$dn_ocl = $matches[1];
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$dn_val = $matches[2];
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$unescaped = self::unescape_dn_value($dn_val);
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$dn_array[$key] = $unescaped[0];
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} else {
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$unescaped = self::unescape_dn_value($value);
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$dn_array[$key] = $unescaped[0];
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}
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}
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}
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if ($options['reverse']) {
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return array_reverse($dn_array);
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} else {
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return $dn_array;
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}
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}
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/**
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* Escapes a DN value according to RFC 2253
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*
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* Escapes the given VALUES according to RFC 2253 so that they can be safely used in LDAP DNs.
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* The characters ",", "+", """, "\", "<", ">", ";", "#", "=" with a special meaning in RFC 2252
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* are preceeded by ba backslash. Control characters with an ASCII code < 32 are represented as \hexpair.
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* Finally all leading and trailing spaces are converted to sequences of \20.
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*
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* @param array $values An array containing the DN values that should be escaped
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*
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* @static
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* @return array The array $values, but escaped
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*/
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public static function escape_dn_value($values = array())
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{
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// Parameter validation
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if (!is_array($values)) {
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$values = array($values);
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}
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foreach ($values as $key => $val) {
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// Escaping of filter meta characters
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$val = str_replace('\\', '\\\\', $val);
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$val = str_replace(',', '\,', $val);
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$val = str_replace('+', '\+', $val);
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$val = str_replace('"', '\"', $val);
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$val = str_replace('<', '\<', $val);
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$val = str_replace('>', '\>', $val);
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$val = str_replace(';', '\;', $val);
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$val = str_replace('#', '\#', $val);
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$val = str_replace('=', '\=', $val);
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// ASCII < 32 escaping
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$val = self::asc2hex32($val);
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// Convert all leading and trailing spaces to sequences of \20.
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if (preg_match('/^(\s*)(.+?)(\s*)$/', $val, $matches)) {
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$val = $matches[2];
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for ($i = 0; $i < strlen($matches[1]); $i++) {
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$val = '\20'.$val;
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}
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for ($i = 0; $i < strlen($matches[3]); $i++) {
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$val = $val.'\20';
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}
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}
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if (null === $val) $val = '\0'; // apply escaped "null" if string is empty
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$values[$key] = $val;
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}
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return $values;
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}
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/**
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* Undoes the conversion done by escape_dn_value().
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*
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* Any escape sequence starting with a baskslash - hexpair or special character -
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* will be transformed back to the corresponding character.
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*
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* @param array $values Array of DN Values
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*
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* @return array Same as $values, but unescaped
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* @static
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*/
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public static function unescape_dn_value($values = array())
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{
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// Parameter validation
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if (!is_array($values)) {
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$values = array($values);
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}
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foreach ($values as $key => $val) {
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// strip slashes from special chars
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$val = str_replace('\\\\', '\\', $val);
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$val = str_replace('\,', ',', $val);
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$val = str_replace('\+', '+', $val);
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$val = str_replace('\"', '"', $val);
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$val = str_replace('\<', '<', $val);
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$val = str_replace('\>', '>', $val);
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$val = str_replace('\;', ';', $val);
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$val = str_replace('\#', '#', $val);
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$val = str_replace('\=', '=', $val);
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// Translate hex code into ascii
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$values[$key] = self::hex2asc($val);
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}
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return $values;
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}
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/**
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* Returns the given DN in a canonical form
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*
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* Returns false if DN is not a valid Distinguished Name.
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* DN can either be a string or an array
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* as returned by ldap_explode_dn, which is useful when constructing a DN.
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* The DN array may have be indexed (each array value is a OCL=VALUE pair)
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* or associative (array key is OCL and value is VALUE).
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*
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* It performs the following operations on the given DN:
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* - Removes the leading 'OID.' characters if the type is an OID instead of a name.
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* - Escapes all RFC 2253 special characters (",", "+", """, "\", "<", ">", ";", "#", "="), slashes ("/"), and any other character where the ASCII code is < 32 as \hexpair.
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* - Converts all leading and trailing spaces in values to be \20.
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* - If an RDN contains multiple parts, the parts are re-ordered so that the attribute type names are in alphabetical order.
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*
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* OPTIONS is a list of name/value pairs, valid options are:
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* casefold Controls case folding of attribute type names.
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* Attribute values are not affected by this option. The default is to uppercase.
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* Valid values are:
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* lower Lowercase attribute type names.
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* upper Uppercase attribute type names. This is the default.
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* none Do not change attribute type names.
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* [NOT IMPLEMENTED] mbcescape If TRUE, characters that are encoded as a multi-octet UTF-8 sequence will be escaped as \(hexpair){2,*}.
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* reverse If TRUE, the RDN sequence is reversed.
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* separator Separator to use between RDNs. Defaults to comma (',').
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*
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* Note: The empty string "" is a valid DN, so be sure not to do a "$can_dn == false" test,
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* because an empty string evaluates to false. Use the "===" operator instead.
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*
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* @param array|string $dn The DN
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* @param array $options Options to use
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*
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* @static
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* @return false|string The canonical DN or FALSE
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* @todo implement option mbcescape
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*/
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public static function canonical_dn($dn, $options = array('casefold' => 'upper', 'separator' => ','))
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{
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if ($dn === '') return $dn; // empty DN is valid!
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// options check
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if (!isset($options['reverse'])) {
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$options['reverse'] = false;
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} else {
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$options['reverse'] = true;
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}
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if (!isset($options['casefold'])) $options['casefold'] = 'upper';
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if (!isset($options['separator'])) $options['separator'] = ',';
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if (!is_array($dn)) {
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// It is not clear to me if the perl implementation splits by the user defined
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// separator or if it just uses this separator to construct the new DN
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$dn = preg_split('/(?<=[^\\\\])'.$options['separator'].'/', $dn);
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// clear wrong splitting (possibly we have split too much)
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$dn = self::correct_dn_splitting($dn, $options['separator']);
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} else {
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// Is array, check, if the array is indexed or associative
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$assoc = false;
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foreach ($dn as $dn_key => $dn_part) {
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if (!is_int($dn_key)) {
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$assoc = true;
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}
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}
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// convert to indexed, if associative array detected
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if ($assoc) {
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$newdn = array();
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foreach ($dn as $dn_key => $dn_part) {
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if (is_array($dn_part)) {
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ksort($dn_part, SORT_STRING); // we assume here, that the rdn parts are also associative
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$newdn[] = $dn_part; // copy array as-is, so we can resolve it later
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} else {
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$newdn[] = $dn_key.'='.$dn_part;
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}
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}
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$dn =& $newdn;
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}
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}
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// Escaping and casefolding
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foreach ($dn as $pos => $dnval) {
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if (is_array($dnval)) {
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// subarray detected, this means very surely, that we had
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// a multivalued dn part, which must be resolved
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$dnval_new = '';
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foreach ($dnval as $subkey => $subval) {
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// build RDN part
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if (!is_int($subkey)) {
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$subval = $subkey.'='.$subval;
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}
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$subval_processed = self::canonical_dn($subval);
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if (false === $subval_processed) return false;
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$dnval_new .= $subval_processed.'+';
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}
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$dn[$pos] = substr($dnval_new, 0, -1); // store RDN part, strip last plus
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} else {
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// try to split multivalued RDNS into array
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$rdns = self::split_rdn_multival($dnval);
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if (count($rdns) > 1) {
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// Multivalued RDN was detected!
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// The RDN value is expected to be correctly split by split_rdn_multival().
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// It's time to sort the RDN and build the DN!
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$rdn_string = '';
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sort($rdns, SORT_STRING); // Sort RDN keys alphabetically
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foreach ($rdns as $rdn) {
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$subval_processed = self::canonical_dn($rdn);
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if (false === $subval_processed) return false;
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$rdn_string .= $subval_processed.'+';
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}
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$dn[$pos] = substr($rdn_string, 0, -1); // store RDN part, strip last plus
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} else {
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// no multivalued RDN!
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// split at first unescaped "="
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$dn_comp = preg_split('/(?<=[^\\\\])=/', $rdns[0], 2);
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$ocl = ltrim($dn_comp[0]); // trim left whitespaces 'cause of "cn=foo, l=bar" syntax (whitespace after comma)
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$val = $dn_comp[1];
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// strip 'OID.', otherwise apply casefolding and escaping
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if (substr(strtolower($ocl), 0, 4) == 'oid.') {
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$ocl = substr($ocl, 4);
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} else {
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if ($options['casefold'] == 'upper') $ocl = strtoupper($ocl);
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if ($options['casefold'] == 'lower') $ocl = strtolower($ocl);
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$ocl = self::escape_dn_value(array($ocl));
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$ocl = $ocl[0];
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}
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// escaping of dn-value
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$val = self::escape_dn_value(array($val));
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$val = str_replace('/', '\/', $val[0]);
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$dn[$pos] = $ocl.'='.$val;
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}
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}
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}
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if ($options['reverse']) $dn = array_reverse($dn);
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return implode($options['separator'], $dn);
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}
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/**
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* Escapes the given VALUES according to RFC 2254 so that they can be safely used in LDAP filters.
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*
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* Any control characters with an ACII code < 32 as well as the characters with special meaning in
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* LDAP filters "*", "(", ")", and "\" (the backslash) are converted into the representation of a
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* backslash followed by two hex digits representing the hexadecimal value of the character.
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*
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* @param array $values Array of values to escape
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*
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* @static
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* @return array Array $values, but escaped
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*/
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public static function escape_filter_value($values = array())
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{
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// Parameter validation
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if (!is_array($values)) {
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$values = array($values);
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}
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foreach ($values as $key => $val) {
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// Escaping of filter meta characters
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$val = str_replace('\\', '\5c', $val);
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$val = str_replace('*', '\2a', $val);
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$val = str_replace('(', '\28', $val);
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$val = str_replace(')', '\29', $val);
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// ASCII < 32 escaping
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$val = self::asc2hex32($val);
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if (null === $val) $val = '\0'; // apply escaped "null" if string is empty
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$values[$key] = $val;
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}
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return $values;
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}
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/**
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* Undoes the conversion done by {@link escape_filter_value()}.
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*
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* Converts any sequences of a backslash followed by two hex digits into the corresponding character.
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*
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* @param array $values Array of values to escape
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*
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* @static
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* @return array Array $values, but unescaped
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*/
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public static function unescape_filter_value($values = array())
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{
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// Parameter validation
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if (!is_array($values)) {
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$values = array($values);
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}
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foreach ($values as $key => $value) {
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// Translate hex code into ascii
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$values[$key] = self::hex2asc($value);
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}
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return $values;
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}
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/**
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* Converts all ASCII chars < 32 to "\HEX"
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*
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* @param string $string String to convert
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*
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* @static
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* @return string
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*/
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public static function asc2hex32($string)
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{
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for ($i = 0; $i < strlen($string); $i++) {
|
|
$char = substr($string, $i, 1);
|
|
if (ord($char) < 32) {
|
|
$hex = dechex(ord($char));
|
|
if (strlen($hex) == 1) $hex = '0'.$hex;
|
|
$string = str_replace($char, '\\'.$hex, $string);
|
|
}
|
|
}
|
|
return $string;
|
|
}
|
|
|
|
/**
|
|
* Converts all Hex expressions ("\HEX") to their original ASCII characters
|
|
*
|
|
* @param string $string String to convert
|
|
*
|
|
* @static
|
|
* @author beni@php.net, heavily based on work from DavidSmith@byu.net
|
|
* @return string
|
|
*/
|
|
public static function hex2asc($string)
|
|
{
|
|
$string = preg_replace("/\\\([0-9A-Fa-f]{2})/e", "''.chr(hexdec('\\1')).''", $string);
|
|
return $string;
|
|
}
|
|
|
|
/**
|
|
* Split an multivalued RDN value into an Array
|
|
*
|
|
* A RDN can contain multiple values, spearated by a plus sign.
|
|
* This function returns each separate ocl=value pair of the RDN part.
|
|
*
|
|
* If no multivalued RDN is detected, an array containing only
|
|
* the original rdn part is returned.
|
|
*
|
|
* For example, the multivalued RDN 'OU=Sales+CN=J. Smith' is exploded to:
|
|
* <kbd>array([0] => 'OU=Sales', [1] => 'CN=J. Smith')</kbd>
|
|
*
|
|
* The method trys to be smart if it encounters unescaped "+" characters, but may fail,
|
|
* so ensure escaped "+"es in attr names and attr values.
|
|
*
|
|
* [BUG] If you have a multivalued RDN with unescaped plus characters
|
|
* and there is a unescaped plus sign at the end of an value followed by an
|
|
* attribute name containing an unescaped plus, then you will get wrong splitting:
|
|
* $rdn = 'OU=Sales+C+N=J. Smith';
|
|
* returns:
|
|
* array('OU=Sales+C', 'N=J. Smith');
|
|
* The "C+" is treaten as value of the first pair instead as attr name of the second pair.
|
|
* To prevent this, escape correctly.
|
|
*
|
|
* @param string $rdn Part of an (multivalued) escaped RDN (eg. ou=foo OR ou=foo+cn=bar)
|
|
*
|
|
* @static
|
|
* @return array Array with the components of the multivalued RDN or Error
|
|
*/
|
|
public static function split_rdn_multival($rdn)
|
|
{
|
|
$rdns = preg_split('/(?<!\\\\)\+/', $rdn);
|
|
$rdns = self::correct_dn_splitting($rdns, '+');
|
|
return array_values($rdns);
|
|
}
|
|
|
|
/**
|
|
* Splits a attribute=value syntax into an array
|
|
*
|
|
* The split will occur at the first unescaped '=' character.
|
|
*
|
|
* @param string $attr Attribute and Value Syntax
|
|
*
|
|
* @return array Indexed array: 0=attribute name, 1=attribute value
|
|
*/
|
|
public static function split_attribute_string($attr)
|
|
{
|
|
return preg_split('/(?<!\\\\)=/', $attr, 2);
|
|
}
|
|
|
|
/**
|
|
* Corrects splitting of dn parts
|
|
*
|
|
* @param array $dn Raw DN array
|
|
* @param array $separator Separator that was used when splitting
|
|
*
|
|
* @return array Corrected array
|
|
* @access protected
|
|
*/
|
|
protected static function correct_dn_splitting($dn = array(), $separator = ',')
|
|
{
|
|
foreach ($dn as $key => $dn_value) {
|
|
$dn_value = $dn[$key]; // refresh value (foreach caches!)
|
|
// if the dn_value is not in attr=value format, then we had an
|
|
// unescaped separator character inside the attr name or the value.
|
|
// We assume, that it was the attribute value.
|
|
// [TODO] To solve this, we might ask the schema. Keep in mind, that UTIL class
|
|
// must remain independent from the other classes or connections.
|
|
if (!preg_match('/.+(?<!\\\\)=.+/', $dn_value)) {
|
|
unset($dn[$key]);
|
|
if (array_key_exists($key-1, $dn)) {
|
|
$dn[$key-1] = $dn[$key-1].$separator.$dn_value; // append to previous attr value
|
|
} else {
|
|
$dn[$key+1] = $dn_value.$separator.$dn[$key+1]; // first element: prepend to next attr name
|
|
}
|
|
}
|
|
}
|
|
return array_values($dn);
|
|
}
|
|
}
|
|
|
|
?>
|