diff options
Diffstat (limited to 'program/lib/Roundcube/rcube_ldap_generic.php')
| -rw-r--r-- | program/lib/Roundcube/rcube_ldap_generic.php | 908 |
1 files changed, 908 insertions, 0 deletions
diff --git a/program/lib/Roundcube/rcube_ldap_generic.php b/program/lib/Roundcube/rcube_ldap_generic.php new file mode 100644 index 000000000..01d3fa888 --- /dev/null +++ b/program/lib/Roundcube/rcube_ldap_generic.php @@ -0,0 +1,908 @@ +<?php + +/* + +-----------------------------------------------------------------------+ + | Roundcube/rcube_ldap_generic.php | + | | + | This file is part of the Roundcube Webmail client | + | Copyright (C) 2006-2013, The Roundcube Dev Team | + | Copyright (C) 2012-2013, Kolab Systems AG | + | | + | Licensed under the GNU General Public License version 3 or | + | any later version with exceptions for skins & plugins. | + | See the README file for a full license statement. | + | | + | PURPOSE: | + | Provide basic functionality for accessing LDAP directories | + | | + +-----------------------------------------------------------------------+ + | Author: Thomas Bruederli <roundcube@gmail.com> | + | Aleksander Machniak <machniak@kolabsys.com> | + +-----------------------------------------------------------------------+ +*/ + + +/* + LDAP connection properties + -------------------------- + + $prop = array( + 'host' => '<ldap-server-address>', + // or + 'hosts' => array('directory.verisign.com'), + 'port' => 389, + 'use_tls' => true|false, + 'ldap_version' => 3, // using LDAPv3 + 'auth_method' => '', // SASL authentication method (for proxy auth), e.g. DIGEST-MD5 + 'attributes' => array('dn'), // List of attributes to read from the server + 'vlv' => false, // Enable Virtual List View to more efficiently fetch paginated data (if server supports it) + 'sort' => array('cn'), // Sort attributes of the VLV index + 'numsub_filter' => '(objectClass=organizationalUnit)', // with VLV, we also use numSubOrdinates to query the total number of records. Set this filter to get all numSubOrdinates attributes for counting + 'sizelimit' => '0', // Enables you to limit the count of entries fetched. Setting this to 0 means no limit. + 'timelimit' => '0', // Sets the number of seconds how long is spend on the search. Setting this to 0 means no limit. + 'network_timeout' => 10, // The timeout (in seconds) for connect + bind arrempts. This is only supported in PHP >= 5.3.0 with OpenLDAP 2.x + 'referrals' => true|false, // Sets the LDAP_OPT_REFERRALS option. Mostly used in multi-domain Active Directory setups + ); +*/ + +/** + * Model class to access an LDAP directories + * + * @package Framework + * @subpackage LDAP + */ +class rcube_ldap_generic +{ + const UPDATE_MOD_ADD = 1; + const UPDATE_MOD_DELETE = 2; + const UPDATE_MOD_REPLACE = 4; + const UPDATE_MOD_FULL = 7; + + public $conn; + public $vlv_active = false; + + /** private properties */ + protected $config = array(); + protected $attributes = array('dn'); + protected $entries = null; + protected $result = null; + protected $debug = false; + protected $list_page = 1; + protected $page_size = 10; + + + /** + * Object constructor + * + * @param array $p LDAP connection properties + * @param boolean $debug Enables debug mode + */ + function __construct($p, $debug = false) + { + $this->config = $p; + + if (is_array($p['attributes'])) + $this->attributes = $p['attributes']; + + if (!is_array($p['hosts']) && !empty($p['host'])) + $this->config['hosts'] = array($p['host']); + + $this->debug = $debug; + } + + /** + * Activate/deactivate debug mode + * + * @param boolean $dbg True if LDAP commands should be logged + */ + public function set_debug($dbg = true) + { + $this->debug = $dbg; + } + + /** + * Set connection options + * + * @param mixed $opt Option name as string or hash array with multiple options + * @param mixed $val Option value + */ + public function set_config($opt, $val = null) + { + if (is_array($opt)) + $this->config = array_merge($this->config, $opt); + else + $this->config[$opt] = $value; + } + + + /** + * Set properties for VLV-based paging + * + * @param number $page Page number to list (starting at 1) + * @param number $size Number of entries to display on one page + */ + public function set_vlv_page($page, $size = 10) + { + $this->list_page = $page; + $this->page_size = $size; + } + + + /** + * Establish a connection to the LDAP server + */ + public function connect($host = null) + { + if (!function_exists('ldap_connect')) { + rcube::raise_error(array('code' => 100, 'type' => 'ldap', + 'file' => __FILE__, 'line' => __LINE__, + 'message' => "No ldap support in this installation of PHP"), + true); + return false; + } + + if (is_resource($this->conn) && $this->config['host'] == $host) + return true; + + if (empty($this->config['ldap_version'])) + $this->config['ldap_version'] = 3; + + // iterate over hosts if none specified + if (!$host) { + if (!is_array($this->config['hosts'])) + $this->config['hosts'] = array($this->config['hosts']); + + foreach ($this->config['hosts'] as $host) { + if ($this->connect($host)) { + return true; + } + } + + return false; + } + + // open connection to the given $host + $host = rcube_utils::idn_to_ascii(rcube_utils::parse_host($host)); + $hostname = $host . ($this->config['port'] ? ':'.$this->config['port'] : ''); + + $this->_debug("C: Connect [$hostname] [{$this->config['name']}]"); + + if ($lc = @ldap_connect($host, $this->config['port'])) { + if ($this->config['use_tls'] === true) + if (!ldap_start_tls($lc)) + continue; + + $this->_debug("S: OK"); + + ldap_set_option($lc, LDAP_OPT_PROTOCOL_VERSION, $this->config['ldap_version']); + $this->config['host'] = $host; + $this->conn = $lc; + + if (!empty($this->config['network_timeout'])) + ldap_set_option($lc, LDAP_OPT_NETWORK_TIMEOUT, $this->config['network_timeout']); + + if (isset($this->config['referrals'])) + ldap_set_option($lc, LDAP_OPT_REFERRALS, $this->config['referrals']); + } + else { + $this->_debug("S: NOT OK"); + } + + if (!is_resource($this->conn)) { + rcube::raise_error(array('code' => 100, 'type' => 'ldap', + 'file' => __FILE__, 'line' => __LINE__, + 'message' => "Could not connect to any LDAP server, last tried $hostname"), + true); + return false; + } + + return true; + } + + + /** + * Bind connection with (SASL-) user and password + * + * @param string $authc Authentication user + * @param string $pass Bind password + * @param string $authz Autorization user + * + * @return boolean True on success, False on error + */ + public function sasl_bind($authc, $pass, $authz=null) + { + if (!$this->conn) { + return false; + } + + if (!function_exists('ldap_sasl_bind')) { + rcube::raise_error(array('code' => 100, 'type' => 'ldap', + 'file' => __FILE__, 'line' => __LINE__, + 'message' => "Unable to bind: ldap_sasl_bind() not exists"), + true); + return false; + } + + if (!empty($authz)) { + $authz = 'u:' . $authz; + } + + if (!empty($this->config['auth_method'])) { + $method = $this->config['auth_method']; + } + else { + $method = 'DIGEST-MD5'; + } + + $this->_debug("C: Bind [mech: $method, authc: $authc, authz: $authz] [pass: $pass]"); + + if (ldap_sasl_bind($this->conn, NULL, $pass, $method, NULL, $authc, $authz)) { + $this->_debug("S: OK"); + return true; + } + + $this->_debug("S: ".ldap_error($this->conn)); + + rcube::raise_error(array( + 'code' => ldap_errno($this->conn), 'type' => 'ldap', + 'file' => __FILE__, 'line' => __LINE__, + 'message' => "SASL Bind failed for authcid=$authc ".ldap_error($this->conn)), + true); + return false; + } + + + /** + * Bind connection with DN and password + * + * @param string $dn Bind DN + * @param string $pass Bind password + * + * @return boolean True on success, False on error + */ + public function bind($dn, $pass) + { + if (!$this->conn) { + return false; + } + + $this->_debug("C: Bind [dn: $dn] [pass: $pass]"); + + if (@ldap_bind($this->conn, $dn, $pass)) { + $this->_debug("S: OK"); + return true; + } + + $this->_debug("S: ".ldap_error($this->conn)); + + rcube::raise_error(array( + 'code' => ldap_errno($this->conn), 'type' => 'ldap', + 'file' => __FILE__, 'line' => __LINE__, + 'message' => "Bind failed for dn=$dn: ".ldap_error($this->conn)), + true); + + return false; + } + + + /** + * Close connection to LDAP server + */ + public function close() + { + if ($this->conn) { + $this->_debug("C: Close"); + ldap_unbind($this->conn); + $this->conn = null; + } + } + + + /** + * Return the last result set + * + * @return object rcube_ldap_result Result object + */ + function get_result() + { + return $this->result; + } + + + /** + * Get a specific LDAP entry, identified by its DN + * + * @param string $dn Record identifier + * @return array Hash array + */ + function get_entry($dn) + { + $rec = null; + + if ($this->conn && $dn) { + $this->_debug("C: Read [dn: $dn] [(objectclass=*)]"); + + if ($ldap_result = @ldap_read($this->conn, $dn, '(objectclass=*)', $this->attributes)) { + $this->_debug("S: OK"); + + if ($entry = ldap_first_entry($this->conn, $ldap_result)) { + $rec = ldap_get_attributes($this->conn, $entry); + } + } + else { + $this->_debug("S: ".ldap_error($this->conn)); + } + + if (!empty($rec)) { + $rec['dn'] = $dn; // Add in the dn for the entry. + } + } + + return $rec; + } + + + /** + * Execute the LDAP search based on the stored credentials + * + * @param string $base_dn The base DN to query + * @param string $filter The LDAP filter for search + * @param string $scope The LDAP scope (list|sub|base) + * @param array $attrs List of entry attributes to read + * @param array $prop Hash array with query configuration properties: + * - vlv: true if VLV index should be used + * - sort: array of sort attributes (has to be in sync with the VLV index) + * - search: search string used for VLV controls + * @param boolean $count_only Set to true if only entry count is requested + * + * @return mixed rcube_ldap_result object or number of entries (if count_only=true) or false on error + */ + public function search($base_dn, $filter = '', $scope = 'sub', $attrs = array('dn'), $prop = array(), $count_only = false) + { + if ($this->conn) { + if (empty($filter)) + $filter = $filter = '(objectclass=*)'; + + $this->_debug("C: Search [$filter][dn: $base_dn]"); + + $function = self::scope2func($scope, $ns_function); + + // when using VLV, we get the total count by... + if (!$count_only && $function != 'ldap_read' && $prop['vlv']) { // TODO: auto-detect VLV support for the given query + // ...either reading numSubOrdinates attribute + if ($this->config['numsub_filter'] && ($result_count = @$ns_function($this->conn, $base_dn, $this->config['numsub_filter'], array('numSubOrdinates'), 0, 0, 0))) { + $counts = ldap_get_entries($this->conn, $result_count); + for ($vlv_count = $j = 0; $j < $counts['count']; $j++) + $vlv_count += $counts[$j]['numsubordinates'][0]; + $this->_debug("D: total numsubordinates = " . $vlv_count); + } + else if (!function_exists('ldap_parse_virtuallist_control')) // ...or by fetching all records dn and count them + $vlv_count = $this->search($base_dn, $filter, $scope, array('dn'), $prop, true); + + $this->vlv_active = $this->_vlv_set_controls($this->config, $this->list_page, $this->page_size, $vlv_search); + } + else + $this->vlv_active = false; + + // only fetch dn for count (should keep the payload low) + if ($ldap_result = $function($this->conn, $base_dn, $filter, + $attrs, 0, (int)$this->config['sizelimit'], (int)$this->config['timelimit']) + ) { + // when running on a patched PHP we can use the extended functions to retrieve the total count from the LDAP search result + if ($this->vlv_active && function_exists('ldap_parse_virtuallist_control')) { + if (ldap_parse_result($this->conn, $ldap_result, $errcode, $matcheddn, $errmsg, $referrals, $serverctrls)) { + ldap_parse_virtuallist_control($this->conn, $serverctrls, $last_offset, $vlv_count, $vresult); + $this->_debug("S: VLV result: last_offset=$last_offset; content_count=$vlv_count"); + } + else { + $this->_debug("S: ".($errmsg ? $errmsg : ldap_error($this->conn))); + } + } + + $this->result = new rcube_ldap_result($this->conn, $ldap_result, $base_dn, $filter, $vlv_count); + + return $count_only ? $this->result->count() : $this->result; + } + else { + $this->_debug("S: ".ldap_error($this->conn)); + } + } + + return false; + } + + + /** + * Modify an LDAP entry on the server + * + * @param string $dn Entry DN + * @param array $params Hash array of entry attributes + * @param int $mode Update mode (UPDATE_MOD_ADD | UPDATE_MOD_DELETE | UPDATE_MOD_REPLACE) + */ + public function modify($dn, $parms, $mode = 255) + { + // TODO: implement this + + return false; + } + + /** + * Wrapper for ldap_add() + * + * @see ldap_add() + */ + public function add($dn, $entry) + { + $this->_debug("C: Add [dn: $dn]: ".print_r($entry, true)); + + $res = ldap_add($this->conn, $dn, $entry); + if ($res === false) { + $this->_debug("S: ".ldap_error($this->conn)); + return false; + } + + $this->_debug("S: OK"); + return true; + } + + /** + * Wrapper for ldap_delete() + * + * @see ldap_delete() + */ + public function delete($dn) + { + $this->_debug("C: Delete [dn: $dn]"); + + $res = ldap_delete($this->conn, $dn); + if ($res === false) { + $this->_debug("S: ".ldap_error($this->conn)); + return false; + } + + $this->_debug("S: OK"); + return true; + } + + /** + * Wrapper for ldap_mod_replace() + * + * @see ldap_mod_replace() + */ + public function mod_replace($dn, $entry) + { + $this->_debug("C: Replace [dn: $dn]: ".print_r($entry, true)); + + if (!ldap_mod_replace($this->conn, $dn, $entry)) { + $this->_debug("S: ".ldap_error($this->conn)); + return false; + } + + $this->_debug("S: OK"); + return true; + } + + /** + * Wrapper for ldap_mod_add() + * + * @see ldap_mod_add() + */ + public function mod_add($dn, $entry) + { + $this->_debug("C: Add [dn: $dn]: ".print_r($entry, true)); + + if (!ldap_mod_add($this->conn, $dn, $entry)) { + $this->_debug("S: ".ldap_error($this->conn)); + return false; + } + + $this->_debug("S: OK"); + return true; + } + + /** + * Wrapper for ldap_mod_del() + * + * @see ldap_mod_del() + */ + public function mod_del($dn, $entry) + { + $this->_debug("C: Delete [dn: $dn]: ".print_r($entry, true)); + + if (!ldap_mod_del($this->conn, $dn, $entry)) { + $this->_debug("S: ".ldap_error($this->conn)); + return false; + } + + $this->_debug("S: OK"); + return true; + } + + /** + * Wrapper for ldap_rename() + * + * @see ldap_rename() + */ + public function rename($dn, $newrdn, $newparent = null, $deleteoldrdn = true) + { + $this->_debug("C: Rename [dn: $dn] [dn: $newrdn]"); + + if (!ldap_rename($this->conn, $dn, $newrdn, $newparent, $deleteoldrdn)) { + $this->_debug("S: ".ldap_error($this->conn)); + return false; + } + + $this->_debug("S: OK"); + return true; + } + + /** + * Wrapper for ldap_list() + ldap_get_entries() + * + * @see ldap_list() + * @see ldap_get_entries() + */ + public function list_entries($dn, $filter, $attributes = array('dn')) + { + $list = array(); + $this->_debug("C: List [dn: $dn] [{$filter}]"); + + if ($result = ldap_list($this->conn, $dn, $filter, $attributes)) { + $list = ldap_get_entries($this->conn, $result); + + if ($list === false) { + $this->_debug("S: ".ldap_error($this->conn)); + return array(); + } + + $count = $list['count']; + unset($list['count']); + + $this->_debug("S: $count record(s)"); + } + else { + $this->_debug("S: ".ldap_error($this->conn)); + } + + return $list; + } + + /** + * Wrapper for ldap_read() + ldap_get_entries() + * + * @see ldap_read() + * @see ldap_get_entries() + */ + public function read_entries($dn, $filter, $attributes = null) + { + $this->_debug("C: Read [dn: $dn] [{$filter}]"); + + if ($this->conn && $dn) { + if (!$attributes) + $attributes = $this->attributes; + + $result = @ldap_read($this->conn, $dn, $filter, $attributes, 0, (int)$this->config['sizelimit'], (int)$this->config['timelimit']); + if ($result === false) { + $this->_debug("S: ".ldap_error($this->conn)); + return false; + } + + $this->_debug("S: OK"); + return ldap_get_entries($this->conn, $result); + } + + return false; + } + + + /** + * Choose the right PHP function according to scope property + * + * @param string $scope The LDAP scope (sub|base|list) + * @param string $ns_function Function to be used for numSubOrdinates queries + * @return string PHP function to be used to query directory + */ + public static function scope2func($scope, &$ns_function = null) + { + switch ($scope) { + case 'sub': + $function = $ns_function = 'ldap_search'; + break; + case 'base': + $function = $ns_function = 'ldap_read'; + break; + default: + $function = 'ldap_list'; + $ns_function = 'ldap_read'; + break; + } + + return $function; + } + + /** + * Escapes the given value according to RFC 2254 so that it can be safely used in LDAP filters. + * + * @param string $val Value to quote + * @return string The escaped value + */ + public static function escape_value($val) + { + return strtr($str, array('*'=>'\2a', '('=>'\28', ')'=>'\29', + '\\'=>'\5c', '/'=>'\2f')); + } + + /** + * Escapes a DN value according to RFC 2253 + * + * @param string $dn DN value o quote + * @return string The escaped value + */ + public static function escape_dn($dn) + { + return strtr($str, array(','=>'\2c', '='=>'\3d', '+'=>'\2b', + '<'=>'\3c', '>'=>'\3e', ';'=>'\3b', '\\'=>'\5c', + '"'=>'\22', '#'=>'\23')); + } + + /** + * Normalize a LDAP result by converting entry attributes arrays into single values + * + * @param array $result LDAP result set fetched with ldap_get_entries() + * @return array Hash array with normalized entries, indexed by their DNs + */ + public static function normalize_result($result) + { + if (!is_array($result)) { + return array(); + } + + $entries = array(); + for ($i = 0; $i < $result['count']; $i++) { + $key = $result[$i]['dn'] ? $result[$i]['dn'] : $i; + $entries[$key] = self::normalize_entry($result[$i]); + } + + return $entries; + } + + /** + * Turn an LDAP entry into a regular PHP array with attributes as keys. + * + * @param array $entry Attributes array as retrieved from ldap_get_attributes() or ldap_get_entries() + * @return array Hash array with attributes as keys + */ + public static function normalize_entry($entry) + { + $rec = array(); + for ($i=0; $i < $entry['count']; $i++) { + $attr = $entry[$i]; + if ($entry[$attr]['count'] == 1) { + switch ($attr) { + case 'objectclass': + $rec[$attr] = array(strtolower($entry[$attr][0])); + break; + default: + $rec[$attr] = $entry[$attr][0]; + break; + } + } + else { + for ($j=0; $j < $entry[$attr]['count']; $j++) { + $rec[$attr][$j] = $entry[$attr][$j]; + } + } + } + + return $rec; + } + + /** + * Set server controls for Virtual List View (paginated listing) + */ + private function _vlv_set_controls($prop, $list_page, $page_size, $search = null) + { + $sort_ctrl = array('oid' => "1.2.840.113556.1.4.473", 'value' => self::_sort_ber_encode((array)$prop['sort'])); + $vlv_ctrl = array('oid' => "2.16.840.1.113730.3.4.9", 'value' => self::_vlv_ber_encode(($offset = ($list_page-1) * $page_size + 1), $page_size, $search), 'iscritical' => true); + + $sort = (array)$prop['sort']; + $this->_debug("C: set controls sort=" . join(' ', unpack('H'.(strlen($sort_ctrl['value'])*2), $sort_ctrl['value'])) . " ($sort[0]);" + . " vlv=" . join(' ', (unpack('H'.(strlen($vlv_ctrl['value'])*2), $vlv_ctrl['value']))) . " ($offset/$page_size)"); + + if (!ldap_set_option($this->conn, LDAP_OPT_SERVER_CONTROLS, array($sort_ctrl, $vlv_ctrl))) { + $this->_debug("S: ".ldap_error($this->conn)); + $this->set_error(self::ERROR_SEARCH, 'vlvnotsupported'); + return false; + } + + return true; + } + + + /** + * Returns unified attribute name (resolving aliases) + */ + private static function _attr_name($namev) + { + // list of known attribute aliases + static $aliases = array( + 'gn' => 'givenname', + 'rfc822mailbox' => 'email', + 'userid' => 'uid', + 'emailaddress' => 'email', + 'pkcs9email' => 'email', + ); + + list($name, $limit) = explode(':', $namev, 2); + $suffix = $limit ? ':'.$limit : ''; + + return (isset($aliases[$name]) ? $aliases[$name] : $name) . $suffix; + } + + + /** + * Prints debug info to the log + */ + private function _debug($str) + { + if ($this->debug && class_exists('rcube')) { + rcube::write_log('ldap', $str); + } + } + + + /** + * Quotes attribute value string + * + * @param string $str Attribute value + * @param bool $dn True if the attribute is a DN + * + * @return string Quoted string + */ + private static function _quote_string($str, $dn=false) + { + // take firt entry if array given + if (is_array($str)) + $str = reset($str); + + if ($dn) + $replace = array(','=>'\2c', '='=>'\3d', '+'=>'\2b', '<'=>'\3c', + '>'=>'\3e', ';'=>'\3b', '\\'=>'\5c', '"'=>'\22', '#'=>'\23'); + else + $replace = array('*'=>'\2a', '('=>'\28', ')'=>'\29', '\\'=>'\5c', + '/'=>'\2f'); + + return strtr($str, $replace); + } + + + /** + * Generate BER encoded string for Virtual List View option + * + * @param integer List offset (first record) + * @param integer Records per page + * @return string BER encoded option value + */ + private static function _vlv_ber_encode($offset, $rpp, $search = '') + { + # this string is ber-encoded, php will prefix this value with: + # 04 (octet string) and 10 (length of 16 bytes) + # the code behind this string is broken down as follows: + # 30 = ber sequence with a length of 0e (14) bytes following + # 02 = type integer (in two's complement form) with 2 bytes following (beforeCount): 01 00 (ie 0) + # 02 = type integer (in two's complement form) with 2 bytes following (afterCount): 01 18 (ie 25-1=24) + # a0 = type context-specific/constructed with a length of 06 (6) bytes following + # 02 = type integer with 2 bytes following (offset): 01 01 (ie 1) + # 02 = type integer with 2 bytes following (contentCount): 01 00 + + # whith a search string present: + # 81 = type context-specific/constructed with a length of 04 (4) bytes following (the length will change here) + # 81 indicates a user string is present where as a a0 indicates just a offset search + # 81 = type context-specific/constructed with a length of 06 (6) bytes following + + # the following info was taken from the ISO/IEC 8825-1:2003 x.690 standard re: the + # encoding of integer values (note: these values are in + # two-complement form so since offset will never be negative bit 8 of the + # leftmost octet should never by set to 1): + # 8.3.2: If the contents octets of an integer value encoding consist + # of more than one octet, then the bits of the first octet (rightmost) and bit 8 + # of the second (to the left of first octet) octet: + # a) shall not all be ones; and + # b) shall not all be zero + + if ($search) + { + $search = preg_replace('/[^-[:alpha:] ,.()0-9]+/', '', $search); + $ber_val = self::_string2hex($search); + $str = self::_ber_addseq($ber_val, '81'); + } + else + { + # construct the string from right to left + $str = "020100"; # contentCount + + $ber_val = self::_ber_encode_int($offset); // returns encoded integer value in hex format + + // calculate octet length of $ber_val + $str = self::_ber_addseq($ber_val, '02') . $str; + + // now compute length over $str + $str = self::_ber_addseq($str, 'a0'); + } + + // now tack on records per page + $str = "020100" . self::_ber_addseq(self::_ber_encode_int($rpp-1), '02') . $str; + + // now tack on sequence identifier and length + $str = self::_ber_addseq($str, '30'); + + return pack('H'.strlen($str), $str); + } + + + /** + * create ber encoding for sort control + * + * @param array List of cols to sort by + * @return string BER encoded option value + */ + private static function _sort_ber_encode($sortcols) + { + $str = ''; + foreach (array_reverse((array)$sortcols) as $col) { + $ber_val = self::_string2hex($col); + + # 30 = ber sequence with a length of octet value + # 04 = octet string with a length of the ascii value + $oct = self::_ber_addseq($ber_val, '04'); + $str = self::_ber_addseq($oct, '30') . $str; + } + + // now tack on sequence identifier and length + $str = self::_ber_addseq($str, '30'); + + return pack('H'.strlen($str), $str); + } + + /** + * Add BER sequence with correct length and the given identifier + */ + private static function _ber_addseq($str, $identifier) + { + $len = dechex(strlen($str)/2); + if (strlen($len) % 2 != 0) + $len = '0'.$len; + + return $identifier . $len . $str; + } + + /** + * Returns BER encoded integer value in hex format + */ + private static function _ber_encode_int($offset) + { + $val = dechex($offset); + $prefix = ''; + + // check if bit 8 of high byte is 1 + if (preg_match('/^[89abcdef]/', $val)) + $prefix = '00'; + + if (strlen($val)%2 != 0) + $prefix .= '0'; + + return $prefix . $val; + } + + /** + * Returns ascii string encoded in hex + */ + private static function _string2hex($str) + { + $hex = ''; + for ($i=0; $i < strlen($str); $i++) + $hex .= dechex(ord($str[$i])); + return $hex; + } + +} |