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authorCraig Andrews <candrews@integralblue.com>2009-11-04 13:39:56 -0500
committerCraig Andrews <candrews@integralblue.com>2009-11-04 13:39:56 -0500
commitc403f7fa442d7f8eacb4e2288429c271450d57d2 (patch)
tree750fc924305db82ff73f202f20b256c989918a19 /extlib/Net/LDAP2/Util.php
parenta82df5fae8b5d71d4545f27e7aa6cc561160922a (diff)
Added Net_LDAP2 to extlib, and add a skeleton LDAP plugin
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+<?php
+/* vim: set expandtab tabstop=4 shiftwidth=4: */
+/**
+* File containing the Net_LDAP2_Util interface class.
+*
+* PHP version 5
+*
+* @category Net
+* @package Net_LDAP2
+* @author Benedikt Hallinger <beni@php.net>
+* @copyright 2009 Benedikt Hallinger
+* @license http://www.gnu.org/licenses/lgpl-3.0.txt LGPLv3
+* @version SVN: $Id: Util.php 286718 2009-08-03 07:30:49Z beni $
+* @link http://pear.php.net/package/Net_LDAP2/
+*/
+
+/**
+* Includes
+*/
+require_once 'PEAR.php';
+
+/**
+* Utility Class for Net_LDAP2
+*
+* This class servers some functionality to the other classes of Net_LDAP2 but most of
+* the methods can be used separately as well.
+*
+* @category Net
+* @package Net_LDAP2
+* @author Benedikt Hallinger <beni@php.net>
+* @license http://www.gnu.org/copyleft/lesser.html LGPL
+* @link http://pear.php.net/package/Net_LDAP22/
+*/
+class Net_LDAP2_Util extends PEAR
+{
+ /**
+ * Constructor
+ *
+ * @access public
+ */
+ public function __construct()
+ {
+ // We do nothing here, since all methods can be called statically.
+ // In Net_LDAP <= 0.7, we needed a instance of Util, because
+ // it was possible to do utf8 encoding and decoding, but this
+ // has been moved to the LDAP class. The constructor remains only
+ // here to document the downward compatibility of creating an instance.
+ }
+
+ /**
+ * Explodes the given DN into its elements
+ *
+ * {@link http://www.ietf.org/rfc/rfc2253.txt RFC 2253} says, a Distinguished Name is a sequence
+ * of Relative Distinguished Names (RDNs), which themselves
+ * are sets of Attributes. For each RDN a array is constructed where the RDN part is stored.
+ *
+ * For example, the DN 'OU=Sales+CN=J. Smith,DC=example,DC=net' is exploded to:
+ * <kbd>array( [0] => array([0] => 'OU=Sales', [1] => 'CN=J. Smith'), [2] => 'DC=example', [3] => 'DC=net' )</kbd>
+ *
+ * [NOT IMPLEMENTED] DNs might also contain values, which are the bytes of the BER encoding of
+ * the X.500 AttributeValue rather than some LDAP string syntax. These values are hex-encoded
+ * and prefixed with a #. To distinguish such BER values, ldap_explode_dn uses references to
+ * the actual values, e.g. '1.3.6.1.4.1.1466.0=#04024869,DC=example,DC=com' is exploded to:
+ * [ { '1.3.6.1.4.1.1466.0' => "\004\002Hi" }, { 'DC' => 'example' }, { 'DC' => 'com' } ];
+ * See {@link http://www.vijaymukhi.com/vmis/berldap.htm} for more information on BER.
+ *
+ * It also performs the following operations on the given DN:
+ * - Unescape "\" followed by ",", "+", """, "\", "<", ">", ";", "#", "=", " ", or a hexpair
+ * and strings beginning with "#".
+ * - Removes the leading 'OID.' characters if the type is an OID instead of a name.
+ * - If an RDN contains multiple parts, the parts are re-ordered so that the attribute type names are in alphabetical order.
+ *
+ * OPTIONS is a list of name/value pairs, valid options are:
+ * casefold Controls case folding of attribute types names.
+ * Attribute values are not affected by this option.
+ * The default is to uppercase. Valid values are:
+ * lower Lowercase attribute types names.
+ * upper Uppercase attribute type names. This is the default.
+ * none Do not change attribute type names.
+ * reverse If TRUE, the RDN sequence is reversed.
+ * onlyvalues If TRUE, then only attributes values are returned ('foo' instead of 'cn=foo')
+ *
+
+ * @param string $dn The DN that should be exploded
+ * @param array $options Options to use
+ *
+ * @static
+ * @return array Parts of the exploded DN
+ * @todo implement BER
+ */
+ public static function ldap_explode_dn($dn, $options = array('casefold' => 'upper'))
+ {
+ if (!isset($options['onlyvalues'])) $options['onlyvalues'] = false;
+ if (!isset($options['reverse'])) $options['reverse'] = false;
+ if (!isset($options['casefold'])) $options['casefold'] = 'upper';
+
+ // Escaping of DN and stripping of "OID."
+ $dn = self::canonical_dn($dn, array('casefold' => $options['casefold']));
+
+ // splitting the DN
+ $dn_array = preg_split('/(?<=[^\\\\]),/', $dn);
+
+ // clear wrong splitting (possibly we have split too much)
+ // /!\ Not clear, if this is neccessary here
+ //$dn_array = self::correct_dn_splitting($dn_array, ',');
+
+ // construct subarrays for multivalued RDNs and unescape DN value
+ // also convert to output format and apply casefolding
+ foreach ($dn_array as $key => $value) {
+ $value_u = self::unescape_dn_value($value);
+ $rdns = self::split_rdn_multival($value_u[0]);
+ if (count($rdns) > 1) {
+ // MV RDN!
+ foreach ($rdns as $subrdn_k => $subrdn_v) {
+ // Casefolding
+ if ($options['casefold'] == 'upper') $subrdn_v = preg_replace("/^(\w+=)/e", "''.strtoupper('\\1').''", $subrdn_v);
+ if ($options['casefold'] == 'lower') $subrdn_v = preg_replace("/^(\w+=)/e", "''.strtolower('\\1').''", $subrdn_v);
+
+ if ($options['onlyvalues']) {
+ preg_match('/(.+?)(?<!\\\\)=(.+)/', $subrdn_v, $matches);
+ $rdn_ocl = $matches[1];
+ $rdn_val = $matches[2];
+ $unescaped = self::unescape_dn_value($rdn_val);
+ $rdns[$subrdn_k] = $unescaped[0];
+ } else {
+ $unescaped = self::unescape_dn_value($subrdn_v);
+ $rdns[$subrdn_k] = $unescaped[0];
+ }
+ }
+
+ $dn_array[$key] = $rdns;
+ } else {
+ // normal RDN
+
+ // Casefolding
+ if ($options['casefold'] == 'upper') $value = preg_replace("/^(\w+=)/e", "''.strtoupper('\\1').''", $value);
+ if ($options['casefold'] == 'lower') $value = preg_replace("/^(\w+=)/e", "''.strtolower('\\1').''", $value);
+
+ if ($options['onlyvalues']) {
+ preg_match('/(.+?)(?<!\\\\)=(.+)/', $value, $matches);
+ $dn_ocl = $matches[1];
+ $dn_val = $matches[2];
+ $unescaped = self::unescape_dn_value($dn_val);
+ $dn_array[$key] = $unescaped[0];
+ } else {
+ $unescaped = self::unescape_dn_value($value);
+ $dn_array[$key] = $unescaped[0];
+ }
+ }
+ }
+
+ if ($options['reverse']) {
+ return array_reverse($dn_array);
+ } else {
+ return $dn_array;
+ }
+ }
+
+ /**
+ * Escapes a DN value according to RFC 2253
+ *
+ * Escapes the given VALUES according to RFC 2253 so that they can be safely used in LDAP DNs.
+ * The characters ",", "+", """, "\", "<", ">", ";", "#", "=" with a special meaning in RFC 2252
+ * are preceeded by ba backslash. Control characters with an ASCII code < 32 are represented as \hexpair.
+ * Finally all leading and trailing spaces are converted to sequences of \20.
+ *
+ * @param array $values An array containing the DN values that should be escaped
+ *
+ * @static
+ * @return array The array $values, but escaped
+ */
+ public static function escape_dn_value($values = array())
+ {
+ // Parameter validation
+ if (!is_array($values)) {
+ $values = array($values);
+ }
+
+ foreach ($values as $key => $val) {
+ // Escaping of filter meta characters
+ $val = str_replace('\\', '\\\\', $val);
+ $val = str_replace(',', '\,', $val);
+ $val = str_replace('+', '\+', $val);
+ $val = str_replace('"', '\"', $val);
+ $val = str_replace('<', '\<', $val);
+ $val = str_replace('>', '\>', $val);
+ $val = str_replace(';', '\;', $val);
+ $val = str_replace('#', '\#', $val);
+ $val = str_replace('=', '\=', $val);
+
+ // ASCII < 32 escaping
+ $val = self::asc2hex32($val);
+
+ // Convert all leading and trailing spaces to sequences of \20.
+ if (preg_match('/^(\s*)(.+?)(\s*)$/', $val, $matches)) {
+ $val = $matches[2];
+ for ($i = 0; $i < strlen($matches[1]); $i++) {
+ $val = '\20'.$val;
+ }
+ for ($i = 0; $i < strlen($matches[3]); $i++) {
+ $val = $val.'\20';
+ }
+ }
+
+ if (null === $val) $val = '\0'; // apply escaped "null" if string is empty
+
+ $values[$key] = $val;
+ }
+
+ return $values;
+ }
+
+ /**
+ * Undoes the conversion done by escape_dn_value().
+ *
+ * Any escape sequence starting with a baskslash - hexpair or special character -
+ * will be transformed back to the corresponding character.
+ *
+ * @param array $values Array of DN Values
+ *
+ * @return array Same as $values, but unescaped
+ * @static
+ */
+ public static function unescape_dn_value($values = array())
+ {
+ // Parameter validation
+ if (!is_array($values)) {
+ $values = array($values);
+ }
+
+ foreach ($values as $key => $val) {
+ // strip slashes from special chars
+ $val = str_replace('\\\\', '\\', $val);
+ $val = str_replace('\,', ',', $val);
+ $val = str_replace('\+', '+', $val);
+ $val = str_replace('\"', '"', $val);
+ $val = str_replace('\<', '<', $val);
+ $val = str_replace('\>', '>', $val);
+ $val = str_replace('\;', ';', $val);
+ $val = str_replace('\#', '#', $val);
+ $val = str_replace('\=', '=', $val);
+
+ // Translate hex code into ascii
+ $values[$key] = self::hex2asc($val);
+ }
+
+ return $values;
+ }
+
+ /**
+ * Returns the given DN in a canonical form
+ *
+ * Returns false if DN is not a valid Distinguished Name.
+ * DN can either be a string or an array
+ * as returned by ldap_explode_dn, which is useful when constructing a DN.
+ * The DN array may have be indexed (each array value is a OCL=VALUE pair)
+ * or associative (array key is OCL and value is VALUE).
+ *
+ * It performs the following operations on the given DN:
+ * - Removes the leading 'OID.' characters if the type is an OID instead of a name.
+ * - Escapes all RFC 2253 special characters (",", "+", """, "\", "<", ">", ";", "#", "="), slashes ("/"), and any other character where the ASCII code is < 32 as \hexpair.
+ * - Converts all leading and trailing spaces in values to be \20.
+ * - If an RDN contains multiple parts, the parts are re-ordered so that the attribute type names are in alphabetical order.
+ *
+ * OPTIONS is a list of name/value pairs, valid options are:
+ * casefold Controls case folding of attribute type names.
+ * Attribute values are not affected by this option. The default is to uppercase.
+ * Valid values are:
+ * lower Lowercase attribute type names.
+ * upper Uppercase attribute type names. This is the default.
+ * none Do not change attribute type names.
+ * [NOT IMPLEMENTED] mbcescape If TRUE, characters that are encoded as a multi-octet UTF-8 sequence will be escaped as \(hexpair){2,*}.
+ * reverse If TRUE, the RDN sequence is reversed.
+ * separator Separator to use between RDNs. Defaults to comma (',').
+ *
+ * Note: The empty string "" is a valid DN, so be sure not to do a "$can_dn == false" test,
+ * because an empty string evaluates to false. Use the "===" operator instead.
+ *
+ * @param array|string $dn The DN
+ * @param array $options Options to use
+ *
+ * @static
+ * @return false|string The canonical DN or FALSE
+ * @todo implement option mbcescape
+ */
+ public static function canonical_dn($dn, $options = array('casefold' => 'upper', 'separator' => ','))
+ {
+ if ($dn === '') return $dn; // empty DN is valid!
+
+ // options check
+ if (!isset($options['reverse'])) {
+ $options['reverse'] = false;
+ } else {
+ $options['reverse'] = true;
+ }
+ if (!isset($options['casefold'])) $options['casefold'] = 'upper';
+ if (!isset($options['separator'])) $options['separator'] = ',';
+
+
+ if (!is_array($dn)) {
+ // It is not clear to me if the perl implementation splits by the user defined
+ // separator or if it just uses this separator to construct the new DN
+ $dn = preg_split('/(?<=[^\\\\])'.$options['separator'].'/', $dn);
+
+ // clear wrong splitting (possibly we have split too much)
+ $dn = self::correct_dn_splitting($dn, $options['separator']);
+ } else {
+ // Is array, check, if the array is indexed or associative
+ $assoc = false;
+ foreach ($dn as $dn_key => $dn_part) {
+ if (!is_int($dn_key)) {
+ $assoc = true;
+ }
+ }
+ // convert to indexed, if associative array detected
+ if ($assoc) {
+ $newdn = array();
+ foreach ($dn as $dn_key => $dn_part) {
+ if (is_array($dn_part)) {
+ ksort($dn_part, SORT_STRING); // we assume here, that the rdn parts are also associative
+ $newdn[] = $dn_part; // copy array as-is, so we can resolve it later
+ } else {
+ $newdn[] = $dn_key.'='.$dn_part;
+ }
+ }
+ $dn =& $newdn;
+ }
+ }
+
+ // Escaping and casefolding
+ foreach ($dn as $pos => $dnval) {
+ if (is_array($dnval)) {
+ // subarray detected, this means very surely, that we had
+ // a multivalued dn part, which must be resolved
+ $dnval_new = '';
+ foreach ($dnval as $subkey => $subval) {
+ // build RDN part
+ if (!is_int($subkey)) {
+ $subval = $subkey.'='.$subval;
+ }
+ $subval_processed = self::canonical_dn($subval);
+ if (false === $subval_processed) return false;
+ $dnval_new .= $subval_processed.'+';
+ }
+ $dn[$pos] = substr($dnval_new, 0, -1); // store RDN part, strip last plus
+ } else {
+ // try to split multivalued RDNS into array
+ $rdns = self::split_rdn_multival($dnval);
+ if (count($rdns) > 1) {
+ // Multivalued RDN was detected!
+ // The RDN value is expected to be correctly split by split_rdn_multival().
+ // It's time to sort the RDN and build the DN!
+ $rdn_string = '';
+ sort($rdns, SORT_STRING); // Sort RDN keys alphabetically
+ foreach ($rdns as $rdn) {
+ $subval_processed = self::canonical_dn($rdn);
+ if (false === $subval_processed) return false;
+ $rdn_string .= $subval_processed.'+';
+ }
+
+ $dn[$pos] = substr($rdn_string, 0, -1); // store RDN part, strip last plus
+
+ } else {
+ // no multivalued RDN!
+ // split at first unescaped "="
+ $dn_comp = preg_split('/(?<=[^\\\\])=/', $rdns[0], 2);
+ $ocl = ltrim($dn_comp[0]); // trim left whitespaces 'cause of "cn=foo, l=bar" syntax (whitespace after comma)
+ $val = $dn_comp[1];
+
+ // strip 'OID.', otherwise apply casefolding and escaping
+ if (substr(strtolower($ocl), 0, 4) == 'oid.') {
+ $ocl = substr($ocl, 4);
+ } else {
+ if ($options['casefold'] == 'upper') $ocl = strtoupper($ocl);
+ if ($options['casefold'] == 'lower') $ocl = strtolower($ocl);
+ $ocl = self::escape_dn_value(array($ocl));
+ $ocl = $ocl[0];
+ }
+
+ // escaping of dn-value
+ $val = self::escape_dn_value(array($val));
+ $val = str_replace('/', '\/', $val[0]);
+
+ $dn[$pos] = $ocl.'='.$val;
+ }
+ }
+ }
+
+ if ($options['reverse']) $dn = array_reverse($dn);
+ return implode($options['separator'], $dn);
+ }
+
+ /**
+ * Escapes the given VALUES according to RFC 2254 so that they can be safely used in LDAP filters.
+ *
+ * Any control characters with an ACII code < 32 as well as the characters with special meaning in
+ * LDAP filters "*", "(", ")", and "\" (the backslash) are converted into the representation of a
+ * backslash followed by two hex digits representing the hexadecimal value of the character.
+ *
+ * @param array $values Array of values to escape
+ *
+ * @static
+ * @return array Array $values, but escaped
+ */
+ public static function escape_filter_value($values = array())
+ {
+ // Parameter validation
+ if (!is_array($values)) {
+ $values = array($values);
+ }
+
+ foreach ($values as $key => $val) {
+ // Escaping of filter meta characters
+ $val = str_replace('\\', '\5c', $val);
+ $val = str_replace('*', '\2a', $val);
+ $val = str_replace('(', '\28', $val);
+ $val = str_replace(')', '\29', $val);
+
+ // ASCII < 32 escaping
+ $val = self::asc2hex32($val);
+
+ if (null === $val) $val = '\0'; // apply escaped "null" if string is empty
+
+ $values[$key] = $val;
+ }
+
+ return $values;
+ }
+
+ /**
+ * Undoes the conversion done by {@link escape_filter_value()}.
+ *
+ * Converts any sequences of a backslash followed by two hex digits into the corresponding character.
+ *
+ * @param array $values Array of values to escape
+ *
+ * @static
+ * @return array Array $values, but unescaped
+ */
+ public static function unescape_filter_value($values = array())
+ {
+ // Parameter validation
+ if (!is_array($values)) {
+ $values = array($values);
+ }
+
+ foreach ($values as $key => $value) {
+ // Translate hex code into ascii
+ $values[$key] = self::hex2asc($value);
+ }
+
+ return $values;
+ }
+
+ /**
+ * Converts all ASCII chars < 32 to "\HEX"
+ *
+ * @param string $string String to convert
+ *
+ * @static
+ * @return string
+ */
+ public static function asc2hex32($string)
+ {
+ 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);
+ }
+}
+
+?>