Added Net_LDAP2 to extlib, and add a skeleton LDAP plugin

1 files changed, 572 insertions, 0 deletions

diff --git a/extlib/Net/LDAP2/Util.php b/extlib/Net/LDAP2/Util.php
new file mode 100644
index 000000000..48b03f9f9
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+++ b/extlib/Net/LDAP2/Util.php
@@ -0,0 +1,572 @@
+<?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);
+    }
+}
+
+?>