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Diffstat (limited to 'plugins/managesieve/lib/Net')
| -rw-r--r-- | plugins/managesieve/lib/Net/Sieve.php | 1211 |
1 files changed, 1211 insertions, 0 deletions
diff --git a/plugins/managesieve/lib/Net/Sieve.php b/plugins/managesieve/lib/Net/Sieve.php new file mode 100644 index 000000000..ecc907194 --- /dev/null +++ b/plugins/managesieve/lib/Net/Sieve.php @@ -0,0 +1,1211 @@ +<?php +/** + * This file contains the Net_Sieve class. + * + * PHP version 4 + * + * +-----------------------------------------------------------------------+ + * | All rights reserved. | + * | | + * | Redistribution and use in source and binary forms, with or without | + * | modification, are permitted provided that the following conditions | + * | are met: | + * | | + * | o Redistributions of source code must retain the above copyright | + * | notice, this list of conditions and the following disclaimer. | + * | o Redistributions in binary form must reproduce the above copyright | + * | notice, this list of conditions and the following disclaimer in the | + * | documentation and/or other materials provided with the distribution.| + * | | + * | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | + * | "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | + * | LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | + * | A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | + * | OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | + * | SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | + * | LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | + * | DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | + * | THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | + * | (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | + * | OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | + * +-----------------------------------------------------------------------+ + * + * @category Networking + * @package Net_Sieve + * @author Richard Heyes <richard@phpguru.org> + * @author Damian Fernandez Sosa <damlists@cnba.uba.ar> + * @author Anish Mistry <amistry@am-productions.biz> + * @author Jan Schneider <jan@horde.org> + * @copyright 2002-2003 Richard Heyes + * @copyright 2006-2008 Anish Mistry + * @license http://www.opensource.org/licenses/bsd-license.php BSD + * @version SVN: $Id: Sieve.php 300898 2010-07-01 09:49:02Z yunosh $ + * @link http://pear.php.net/package/Net_Sieve + */ + +require_once 'PEAR.php'; +require_once 'Net/Socket.php'; + +/** + * TODO + * + * o supportsAuthMech() + */ + +/** + * Disconnected state + * @const NET_SIEVE_STATE_DISCONNECTED + */ +define('NET_SIEVE_STATE_DISCONNECTED', 1, true); + +/** + * Authorisation state + * @const NET_SIEVE_STATE_AUTHORISATION + */ +define('NET_SIEVE_STATE_AUTHORISATION', 2, true); + +/** + * Transaction state + * @const NET_SIEVE_STATE_TRANSACTION + */ +define('NET_SIEVE_STATE_TRANSACTION', 3, true); + + +/** + * A class for talking to the timsieved server which comes with Cyrus IMAP. + * + * @category Networking + * @package Net_Sieve + * @author Richard Heyes <richard@phpguru.org> + * @author Damian Fernandez Sosa <damlists@cnba.uba.ar> + * @author Anish Mistry <amistry@am-productions.biz> + * @author Jan Schneider <jan@horde.org> + * @copyright 2002-2003 Richard Heyes + * @copyright 2006-2008 Anish Mistry + * @license http://www.opensource.org/licenses/bsd-license.php BSD + * @version Release: 1.3.0 + * @link http://pear.php.net/package/Net_Sieve + * @link http://www.ietf.org/rfc/rfc3028.txt RFC 3028 (Sieve: A Mail + * Filtering Language) + * @link http://tools.ietf.org/html/draft-ietf-sieve-managesieve A + * Protocol for Remotely Managing Sieve Scripts + */ +class Net_Sieve +{ + /** + * The authentication methods this class supports. + * + * Can be overwritten if having problems with certain methods. + * + * @var array + */ + var $supportedAuthMethods = array('DIGEST-MD5', 'CRAM-MD5', 'EXTERNAL', + 'PLAIN' , 'LOGIN'); + + /** + * SASL authentication methods that require Auth_SASL. + * + * @var array + */ + var $supportedSASLAuthMethods = array('DIGEST-MD5', 'CRAM-MD5'); + + /** + * The socket handle. + * + * @var resource + */ + var $_sock; + + /** + * Parameters and connection information. + * + * @var array + */ + var $_data; + + /** + * Current state of the connection. + * + * One of the NET_SIEVE_STATE_* constants. + * + * @var integer + */ + var $_state; + + /** + * Constructor error. + * + * @var PEAR_Error + */ + var $_error; + + /** + * Whether to enable debugging. + * + * @var boolean + */ + var $_debug = false; + + /** + * Debug output handler. + * + * This has to be a valid callback. + * + * @var string|array + */ + var $_debug_handler = null; + + /** + * Whether to pick up an already established connection. + * + * @var boolean + */ + var $_bypassAuth = false; + + /** + * Whether to use TLS if available. + * + * @var boolean + */ + var $_useTLS = true; + + /** + * Additional options for stream_context_create(). + * + * @var array + */ + var $_options = null; + + /** + * Maximum number of referral loops + * + * @var array + */ + var $_maxReferralCount = 15; + + /** + * Constructor. + * + * Sets up the object, connects to the server and logs in. Stores any + * generated error in $this->_error, which can be retrieved using the + * getError() method. + * + * @param string $user Login username. + * @param string $pass Login password. + * @param string $host Hostname of server. + * @param string $port Port of server. + * @param string $logintype Type of login to perform (see + * $supportedAuthMethods). + * @param string $euser Effective user. If authenticating as an + * administrator, login as this user. + * @param boolean $debug Whether to enable debugging (@see setDebug()). + * @param string $bypassAuth Skip the authentication phase. Useful if the + * socket is already open. + * @param boolean $useTLS Use TLS if available. + * @param array $options Additional options for + * stream_context_create(). + * @param mixed $handler A callback handler for the debug output. + */ + function Net_Sieve($user = null, $pass = null, $host = 'localhost', + $port = 2000, $logintype = '', $euser = '', + $debug = false, $bypassAuth = false, $useTLS = true, + $options = null, $handler = null) + { + $this->_state = NET_SIEVE_STATE_DISCONNECTED; + $this->_data['user'] = $user; + $this->_data['pass'] = $pass; + $this->_data['host'] = $host; + $this->_data['port'] = $port; + $this->_data['logintype'] = $logintype; + $this->_data['euser'] = $euser; + $this->_sock = new Net_Socket(); + $this->_bypassAuth = $bypassAuth; + $this->_useTLS = $useTLS; + $this->_options = $options; + $this->setDebug($debug, $handler); + + /* Try to include the Auth_SASL package. If the package is not + * available, we disable the authentication methods that depend upon + * it. */ + if ((@include_once 'Auth/SASL.php') === false) { + $this->_debug('Auth_SASL not present'); + foreach ($this->supportedSASLAuthMethods as $SASLMethod) { + $pos = array_search($SASLMethod, $this->supportedAuthMethods); + $this->_debug('Disabling method ' . $SASLMethod); + unset($this->supportedAuthMethods[$pos]); + } + } + + if (strlen($user) && strlen($pass)) { + $this->_error = $this->_handleConnectAndLogin(); + } + } + + /** + * Returns any error that may have been generated in the constructor. + * + * @return boolean|PEAR_Error False if no error, PEAR_Error otherwise. + */ + function getError() + { + return PEAR::isError($this->_error) ? $this->_error : false; + } + + /** + * Sets the debug state and handler function. + * + * @param boolean $debug Whether to enable debugging. + * @param string $handler A custom debug handler. Must be a valid callback. + * + * @return void + */ + function setDebug($debug = true, $handler = null) + { + $this->_debug = $debug; + $this->_debug_handler = $handler; + } + + /** + * Connects to the server and logs in. + * + * @return boolean True on success, PEAR_Error on failure. + */ + function _handleConnectAndLogin() + { + if (PEAR::isError($res = $this->connect($this->_data['host'], $this->_data['port'], $this->_options, $this->_useTLS))) { + return $res; + } + if ($this->_bypassAuth === false) { + if (PEAR::isError($res = $this->login($this->_data['user'], $this->_data['pass'], $this->_data['logintype'], $this->_data['euser'], $this->_bypassAuth))) { + return $res; + } + } + return true; + } + + /** + * Handles connecting to the server and checks the response validity. + * + * @param string $host Hostname of server. + * @param string $port Port of server. + * @param array $options List of options to pass to + * stream_context_create(). + * @param boolean $useTLS Use TLS if available. + * + * @return boolean True on success, PEAR_Error otherwise. + */ + function connect($host, $port, $options = null, $useTLS = true) + { + if (NET_SIEVE_STATE_DISCONNECTED != $this->_state) { + return PEAR::raiseError('Not currently in DISCONNECTED state', 1); + } + + if (PEAR::isError($res = $this->_sock->connect($host, $port, false, 5, $options))) { + return $res; + } + + if ($this->_bypassAuth) { + $this->_state = NET_SIEVE_STATE_TRANSACTION; + } else { + $this->_state = NET_SIEVE_STATE_AUTHORISATION; + if (PEAR::isError($res = $this->_doCmd())) { + return $res; + } + } + + // Explicitly ask for the capabilities in case the connection is + // picked up from an existing connection. + if (PEAR::isError($res = $this->_cmdCapability())) { + return PEAR::raiseError( + 'Failed to connect, server said: ' . $res->getMessage(), 2 + ); + } + + // Check if we can enable TLS via STARTTLS. + if ($useTLS && !empty($this->_capability['starttls']) + && function_exists('stream_socket_enable_crypto') + ) { + if (PEAR::isError($res = $this->_startTLS())) { + return $res; + } + } + + return true; + } + + /** + * Disconnect from the Sieve server. + * + * @param boolean $sendLogoutCMD Whether to send LOGOUT command before + * disconnecting. + * + * @return boolean True on success, PEAR_Error otherwise. + */ + function disconnect($sendLogoutCMD = true) + { + return $this->_cmdLogout($sendLogoutCMD); + } + + /** + * Logs into server. + * + * @param string $user Login username. + * @param string $pass Login password. + * @param string $logintype Type of login method to use. + * @param string $euser Effective UID (perform on behalf of $euser). + * @param boolean $bypassAuth Do not perform authentication. + * + * @return boolean True on success, PEAR_Error otherwise. + */ + function login($user, $pass, $logintype = null, $euser = '', $bypassAuth = false) + { + if (NET_SIEVE_STATE_AUTHORISATION != $this->_state) { + return PEAR::raiseError('Not currently in AUTHORISATION state', 1); + } + + if (!$bypassAuth ) { + if (PEAR::isError($res = $this->_cmdAuthenticate($user, $pass, $logintype, $euser))) { + return $res; + } + } + $this->_state = NET_SIEVE_STATE_TRANSACTION; + + return true; + } + + /** + * Returns an indexed array of scripts currently on the server. + * + * @return array Indexed array of scriptnames. + */ + function listScripts() + { + if (is_array($scripts = $this->_cmdListScripts())) { + $this->_active = $scripts[1]; + return $scripts[0]; + } else { + return $scripts; + } + } + + /** + * Returns the active script. + * + * @return string The active scriptname. + */ + function getActive() + { + if (!empty($this->_active)) { + return $this->_active; + } + if (is_array($scripts = $this->_cmdListScripts())) { + $this->_active = $scripts[1]; + return $scripts[1]; + } + } + + /** + * Sets the active script. + * + * @param string $scriptname The name of the script to be set as active. + * + * @return boolean True on success, PEAR_Error on failure. + */ + function setActive($scriptname) + { + return $this->_cmdSetActive($scriptname); + } + + /** + * Retrieves a script. + * + * @param string $scriptname The name of the script to be retrieved. + * + * @return string The script on success, PEAR_Error on failure. + */ + function getScript($scriptname) + { + return $this->_cmdGetScript($scriptname); + } + + /** + * Adds a script to the server. + * + * @param string $scriptname Name of the script. + * @param string $script The script content. + * @param boolean $makeactive Whether to make this the active script. + * + * @return boolean True on success, PEAR_Error on failure. + */ + function installScript($scriptname, $script, $makeactive = false) + { + if (PEAR::isError($res = $this->_cmdPutScript($scriptname, $script))) { + return $res; + } + if ($makeactive) { + return $this->_cmdSetActive($scriptname); + } + return true; + } + + /** + * Removes a script from the server. + * + * @param string $scriptname Name of the script. + * + * @return boolean True on success, PEAR_Error on failure. + */ + function removeScript($scriptname) + { + return $this->_cmdDeleteScript($scriptname); + } + + /** + * Checks if the server has space to store the script by the server. + * + * @param string $scriptname The name of the script to mark as active. + * @param integer $size The size of the script. + * + * @return boolean|PEAR_Error True if there is space, PEAR_Error otherwise. + * + * @todo Rename to hasSpace() + */ + function haveSpace($scriptname, $size) + { + if (NET_SIEVE_STATE_TRANSACTION != $this->_state) { + return PEAR::raiseError('Not currently in TRANSACTION state', 1); + } + if (PEAR::isError($res = $this->_doCmd(sprintf('HAVESPACE "%s" %d', $scriptname, $size)))) { + return $res; + } + return true; + } + + /** + * Returns the list of extensions the server supports. + * + * @return array List of extensions or PEAR_Error on failure. + */ + function getExtensions() + { + if (NET_SIEVE_STATE_DISCONNECTED == $this->_state) { + return PEAR::raiseError('Not currently connected', 7); + } + return $this->_capability['extensions']; + } + + /** + * Returns whether the server supports an extension. + * + * @param string $extension The extension to check. + * + * @return boolean Whether the extension is supported or PEAR_Error on + * failure. + */ + function hasExtension($extension) + { + if (NET_SIEVE_STATE_DISCONNECTED == $this->_state) { + return PEAR::raiseError('Not currently connected', 7); + } + + $extension = trim($this->_toUpper($extension)); + if (is_array($this->_capability['extensions'])) { + foreach ($this->_capability['extensions'] as $ext) { + if ($ext == $extension) { + return true; + } + } + } + + return false; + } + + /** + * Returns the list of authentication methods the server supports. + * + * @return array List of authentication methods or PEAR_Error on failure. + */ + function getAuthMechs() + { + if (NET_SIEVE_STATE_DISCONNECTED == $this->_state) { + return PEAR::raiseError('Not currently connected', 7); + } + return $this->_capability['sasl']; + } + + /** + * Returns whether the server supports an authentication method. + * + * @param string $method The method to check. + * + * @return boolean Whether the method is supported or PEAR_Error on + * failure. + */ + function hasAuthMech($method) + { + if (NET_SIEVE_STATE_DISCONNECTED == $this->_state) { + return PEAR::raiseError('Not currently connected', 7); + } + + $method = trim($this->_toUpper($method)); + if (is_array($this->_capability['sasl'])) { + foreach ($this->_capability['sasl'] as $sasl) { + if ($sasl == $method) { + return true; + } + } + } + + return false; + } + + /** + * Handles the authentication using any known method. + * + * @param string $uid The userid to authenticate as. + * @param string $pwd The password to authenticate with. + * @param string $userMethod The method to use. If empty, the class chooses + * the best (strongest) available method. + * @param string $euser The effective uid to authenticate as. + * + * @return void + */ + function _cmdAuthenticate($uid, $pwd, $userMethod = null, $euser = '') + { + if (PEAR::isError($method = $this->_getBestAuthMethod($userMethod))) { + return $method; + } + switch ($method) { + case 'DIGEST-MD5': + return $this->_authDigestMD5($uid, $pwd, $euser); + case 'CRAM-MD5': + $result = $this->_authCRAMMD5($uid, $pwd, $euser); + break; + case 'LOGIN': + $result = $this->_authLOGIN($uid, $pwd, $euser); + break; + case 'PLAIN': + $result = $this->_authPLAIN($uid, $pwd, $euser); + break; + case 'EXTERNAL': + $result = $this->_authEXTERNAL($uid, $pwd, $euser); + break; + default : + $result = PEAR::raiseError( + $method . ' is not a supported authentication method' + ); + break; + } + + if (PEAR::isError($res = $this->_doCmd())) { + return $res; + } + + return $result; + } + + /** + * Authenticates the user using the PLAIN method. + * + * @param string $user The userid to authenticate as. + * @param string $pass The password to authenticate with. + * @param string $euser The effective uid to authenticate as. + * + * @return void + */ + function _authPLAIN($user, $pass, $euser) + { + return $this->_sendCmd( + sprintf( + 'AUTHENTICATE "PLAIN" "%s"', + base64_encode($euser . chr(0) . $user . chr(0) . $pass) + ) + ); + } + + /** + * Authenticates the user using the LOGIN method. + * + * @param string $user The userid to authenticate as. + * @param string $pass The password to authenticate with. + * @param string $euser The effective uid to authenticate as. + * + * @return void + */ + function _authLOGIN($user, $pass, $euser) + { + if (PEAR::isError($result = $this->_sendCmd('AUTHENTICATE "LOGIN"'))) { + return $result; + } + if (PEAR::isError($result = $this->_doCmd('"' . base64_encode($user) . '"', true))) { + return $result; + } + return $this->_doCmd('"' . base64_encode($pass) . '"', true); + } + + /** + * Authenticates the user using the CRAM-MD5 method. + * + * @param string $user The userid to authenticate as. + * @param string $pass The password to authenticate with. + * @param string $euser The effective uid to authenticate as. + * + * @return void + */ + function _authCRAMMD5($user, $pass, $euser) + { + if (PEAR::isError($challenge = $this->_doCmd('AUTHENTICATE "CRAM-MD5"', true))) { + return $challenge; + } + + $challenge = base64_decode(trim($challenge)); + $cram = Auth_SASL::factory('crammd5'); + if (PEAR::isError($response = $cram->getResponse($user, $pass, $challenge))) { + return $response; + } + + return $this->_sendStringResponse(base64_encode($response)); + } + + /** + * Authenticates the user using the DIGEST-MD5 method. + * + * @param string $user The userid to authenticate as. + * @param string $pass The password to authenticate with. + * @param string $euser The effective uid to authenticate as. + * + * @return void + */ + function _authDigestMD5($user, $pass, $euser) + { + if (PEAR::isError($challenge = $this->_doCmd('AUTHENTICATE "DIGEST-MD5"', true))) { + return $challenge; + } + + $challenge = base64_decode(trim($challenge)); + $digest = Auth_SASL::factory('digestmd5'); + // @todo Really 'localhost'? + if (PEAR::isError($response = $digest->getResponse($user, $pass, $challenge, 'localhost', 'sieve', $euser))) { + return $response; + } + + if (PEAR::isError($result = $this->_sendStringResponse(base64_encode($response)))) { + return $result; + } + if (PEAR::isError($result = $this->_doCmd('', true))) { + return $result; + } + if ($this->_toUpper(substr($result, 0, 2)) == 'OK') { + return; + } + + /* We don't use the protocol's third step because SIEVE doesn't allow + * subsequent authentication, so we just silently ignore it. */ + if (PEAR::isError($result = $this->_sendStringResponse(''))) { + return $result; + } + + return $this->_doCmd(); + } + + /** + * Authenticates the user using the EXTERNAL method. + * + * @param string $user The userid to authenticate as. + * @param string $pass The password to authenticate with. + * @param string $euser The effective uid to authenticate as. + * + * @return void + * + * @since 1.1.7 + */ + function _authEXTERNAL($user, $pass, $euser) + { + $cmd = sprintf( + 'AUTHENTICATE "EXTERNAL" "%s"', + base64_encode(strlen($euser) ? $euser : $user) + ); + return $this->_sendCmd($cmd); + } + + /** + * Removes a script from the server. + * + * @param string $scriptname Name of the script to delete. + * + * @return boolean True on success, PEAR_Error otherwise. + */ + function _cmdDeleteScript($scriptname) + { + if (NET_SIEVE_STATE_TRANSACTION != $this->_state) { + return PEAR::raiseError('Not currently in AUTHORISATION state', 1); + } + if (PEAR::isError($res = $this->_doCmd(sprintf('DELETESCRIPT "%s"', $scriptname)))) { + return $res; + } + return true; + } + + /** + * Retrieves the contents of the named script. + * + * @param string $scriptname Name of the script to retrieve. + * + * @return string The script if successful, PEAR_Error otherwise. + */ + function _cmdGetScript($scriptname) + { + if (NET_SIEVE_STATE_TRANSACTION != $this->_state) { + return PEAR::raiseError('Not currently in AUTHORISATION state', 1); + } + + if (PEAR::isError($res = $this->_doCmd(sprintf('GETSCRIPT "%s"', $scriptname)))) { + return $res; + } + + return preg_replace('/{[0-9]+}\r\n/', '', $res); + } + + /** + * Sets the active script, i.e. the one that gets run on new mail by the + * server. + * + * @param string $scriptname The name of the script to mark as active. + * + * @return boolean True on success, PEAR_Error otherwise. + */ + function _cmdSetActive($scriptname) + { + if (NET_SIEVE_STATE_TRANSACTION != $this->_state) { + return PEAR::raiseError('Not currently in AUTHORISATION state', 1); + } + if (PEAR::isError($res = $this->_doCmd(sprintf('SETACTIVE "%s"', $scriptname)))) { + return $res; + } + $this->_activeScript = $scriptname; + return true; + } + + /** + * Returns the list of scripts on the server. + * + * @return array An array with the list of scripts in the first element + * and the active script in the second element on success, + * PEAR_Error otherwise. + */ + function _cmdListScripts() + { + if (NET_SIEVE_STATE_TRANSACTION != $this->_state) { + return PEAR::raiseError('Not currently in AUTHORISATION state', 1); + } + + if (PEAR::isError($res = $this->_doCmd('LISTSCRIPTS'))) { + return $res; + } + + $scripts = array(); + $activescript = null; + $res = explode("\r\n", $res); + foreach ($res as $value) { + if (preg_match('/^"(.*)"( ACTIVE)?$/i', $value, $matches)) { + $scripts[] = $matches[1]; + if (!empty($matches[2])) { + $activescript = $matches[1]; + } + } + } + + return array($scripts, $activescript); + } + + /** + * Adds a script to the server. + * + * @param string $scriptname Name of the new script. + * @param string $scriptdata The new script. + * + * @return boolean True on success, PEAR_Error otherwise. + */ + function _cmdPutScript($scriptname, $scriptdata) + { + if (NET_SIEVE_STATE_TRANSACTION != $this->_state) { + return PEAR::raiseError('Not currently in AUTHORISATION state', 1); + } + + $stringLength = $this->_getLineLength($scriptdata); + + if (PEAR::isError($res = $this->_doCmd(sprintf("PUTSCRIPT \"%s\" {%d+}\r\n%s", $scriptname, $stringLength, $scriptdata)))) { + return $res; + } + + return true; + } + + /** + * Logs out of the server and terminates the connection. + * + * @param boolean $sendLogoutCMD Whether to send LOGOUT command before + * disconnecting. + * + * @return boolean True on success, PEAR_Error otherwise. + */ + function _cmdLogout($sendLogoutCMD = true) + { + if (NET_SIEVE_STATE_DISCONNECTED == $this->_state) { + return PEAR::raiseError('Not currently connected', 1); + } + + if ($sendLogoutCMD) { + if (PEAR::isError($res = $this->_doCmd('LOGOUT'))) { + return $res; + } + } + + $this->_sock->disconnect(); + $this->_state = NET_SIEVE_STATE_DISCONNECTED; + + return true; + } + + /** + * Sends the CAPABILITY command + * + * @return boolean True on success, PEAR_Error otherwise. + */ + function _cmdCapability() + { + if (NET_SIEVE_STATE_DISCONNECTED == $this->_state) { + return PEAR::raiseError('Not currently connected', 1); + } + if (PEAR::isError($res = $this->_doCmd('CAPABILITY'))) { + return $res; + } + $this->_parseCapability($res); + return true; + } + + /** + * Parses the response from the CAPABILITY command and stores the result + * in $_capability. + * + * @param string $data The response from the capability command. + * + * @return void + */ + function _parseCapability($data) + { + // Clear the cached capabilities. + $this->_capability = array('sasl' => array(), + 'extensions' => array()); + + $data = preg_split('/\r?\n/', $this->_toUpper($data), -1, PREG_SPLIT_NO_EMPTY); + + for ($i = 0; $i < count($data); $i++) { + if (!preg_match('/^"([A-Z]+)"( "(.*)")?$/', $data[$i], $matches)) { + continue; + } + switch ($matches[1]) { + case 'IMPLEMENTATION': + $this->_capability['implementation'] = $matches[3]; + break; + + case 'SASL': + $this->_capability['sasl'] = preg_split('/\s+/', $matches[3]); + break; + + case 'SIEVE': + $this->_capability['extensions'] = preg_split('/\s+/', $matches[3]); + break; + + case 'STARTTLS': + $this->_capability['starttls'] = true; + break; + } + } + } + + /** + * Sends a command to the server + * + * @param string $cmd The command to send. + * + * @return void + */ + function _sendCmd($cmd) + { + $status = $this->_sock->getStatus(); + if (PEAR::isError($status) || $status['eof']) { + return PEAR::raiseError('Failed to write to socket: connection lost'); + } + if (PEAR::isError($error = $this->_sock->write($cmd . "\r\n"))) { + return PEAR::raiseError( + 'Failed to write to socket: ' . $error->getMessage() + ); + } + $this->_debug("C: $cmd"); + } + + /** + * Sends a string response to the server. + * + * @param string $str The string to send. + * + * @return void + */ + function _sendStringResponse($str) + { + return $this->_sendCmd('{' . $this->_getLineLength($str) . "+}\r\n" . $str); + } + + /** + * Receives a single line from the server. + * + * @return string The server response line. + */ + function _recvLn() + { + if (PEAR::isError($lastline = $this->_sock->gets(8192))) { + return PEAR::raiseError( + 'Failed to read from socket: ' . $lastline->getMessage() + ); + } + + $lastline = rtrim($lastline); + $this->_debug("S: $lastline"); + + if ($lastline === '') { + return PEAR::raiseError('Failed to read from socket'); + } + + return $lastline; + } + + /** + * Send a command and retrieves a response from the server. + * + * @param string $cmd The command to send. + * @param boolean $auth Whether this is an authentication command. + * + * @return string|PEAR_Error Reponse string if an OK response, PEAR_Error + * if a NO response. + */ + function _doCmd($cmd = '', $auth = false) + { + $referralCount = 0; + while ($referralCount < $this->_maxReferralCount) { + if (strlen($cmd)) { + if (PEAR::isError($error = $this->_sendCmd($cmd))) { + return $error; + } + } + + $response = ''; + while (true) { + if (PEAR::isError($line = $this->_recvLn())) { + return $line; + } + $uc_line = $this->_toUpper($line); + + if ('OK' == substr($uc_line, 0, 2)) { + $response .= $line; + return rtrim($response); + } + + if ('NO' == substr($uc_line, 0, 2)) { + // Check for string literal error message. + if (preg_match('/^no {([0-9]+)\+?}/i', $line, $matches)) { + $line .= str_replace( + "\r\n", ' ', $this->_sock->read($matches[1] + 2) + ); + $this->_debug("S: $line"); + } + return PEAR::raiseError(trim($response . substr($line, 2)), 3); + } + + if ('BYE' == substr($uc_line, 0, 3)) { + if (PEAR::isError($error = $this->disconnect(false))) { + return PEAR::raiseError( + 'Cannot handle BYE, the error was: ' + . $error->getMessage(), + 4 + ); + } + // Check for referral, then follow it. Otherwise, carp an + // error. + if (preg_match('/^bye \(referral "(sieve:\/\/)?([^"]+)/i', $line, $matches)) { + // Replace the old host with the referral host + // preserving any protocol prefix. + $this->_data['host'] = preg_replace( + '/\w+(?!(\w|\:\/\/)).*/', $matches[2], + $this->_data['host'] + ); + if (PEAR::isError($error = $this->_handleConnectAndLogin())) { + return PEAR::raiseError( + 'Cannot follow referral to ' + . $this->_data['host'] . ', the error was: ' + . $error->getMessage(), + 5 + ); + } + break; + } + return PEAR::raiseError(trim($response . $line), 6); + } + + if (preg_match('/^{([0-9]+)\+?}/i', $line, $matches)) { + // Matches String Responses. + $str_size = $matches[1] + 2; + $line = ''; + $line_length = 0; + while ($line_length < $str_size) { + $line .= $this->_sock->read($str_size - $line_length); + $line_length = $this->_getLineLength($line); + } + $this->_debug("S: $line"); + + if (!$auth) { + // Receive the pending OK only if we aren't + // authenticating since string responses during + // authentication don't need an OK. + $this->_recvLn(); + } + return $line; + } + + if ($auth) { + // String responses during authentication don't need an + // OK. + $response .= $line; + return rtrim($response); + } + + $response .= $line . "\r\n"; + $referralCount++; + } + } + + return PEAR::raiseError('Max referral count (' . $referralCount . ') reached. Cyrus murder loop error?', 7); + } + + /** + * Returns the name of the best authentication method that the server + * has advertised. + * + * @param string $userMethod Only consider this method as available. + * + * @return string The name of the best supported authentication method or + * a PEAR_Error object on failure. + */ + function _getBestAuthMethod($userMethod = null) + { + if (!isset($this->_capability['sasl'])) { + return PEAR::raiseError('This server doesn\'t support any authentication methods. SASL problem?'); + } + if (!$this->_capability['sasl']) { + return PEAR::raiseError('This server doesn\'t support any authentication methods.'); + } + + if ($userMethod) { + if (in_array($userMethod, $this->_capability['sasl'])) { + return $userMethod; + } + return PEAR::raiseError( + sprintf('No supported authentication method found. The server supports these methods: %s, but we want to use: %s', + implode(', ', $this->_capability['sasl']), + $userMethod)); + } + + foreach ($this->supportedAuthMethods as $method) { + if (in_array($method, $this->_capability['sasl'])) { + return $method; + } + } + + return PEAR::raiseError( + sprintf('No supported authentication method found. The server supports these methods: %s, but we only support: %s', + implode(', ', $this->_capability['sasl']), + implode(', ', $this->supportedAuthMethods))); + } + + /** + * Starts a TLS connection. + * + * @return boolean True on success, PEAR_Error on failure. + */ + function _startTLS() + { + if (PEAR::isError($res = $this->_doCmd('STARTTLS'))) { + return $res; + } + + if (!stream_socket_enable_crypto($this->_sock->fp, true, STREAM_CRYPTO_METHOD_TLS_CLIENT)) { + return PEAR::raiseError('Failed to establish TLS connection', 2); + } + + $this->_debug('STARTTLS negotiation successful'); + + // The server should be sending a CAPABILITY response after + // negotiating TLS. Read it, and ignore if it doesn't. + $this->_doCmd(); + + // RFC says we need to query the server capabilities again now that we + // are under encryption. + if (PEAR::isError($res = $this->_cmdCapability())) { + return PEAR::raiseError( + 'Failed to connect, server said: ' . $res->getMessage(), 2 + ); + } + + return true; + } + + /** + * Returns the length of a string. + * + * @param string $string A string. + * + * @return integer The length of the string. + */ + function _getLineLength($string) + { + if (extension_loaded('mbstring')) { + return mb_strlen($string, 'latin1'); + } else { + return strlen($string); + } + } + + /** + * Locale independant strtoupper() implementation. + * + * @param string $string The string to convert to lowercase. + * + * @return string The lowercased string, based on ASCII encoding. + */ + function _toUpper($string) + { + $language = setlocale(LC_CTYPE, 0); + setlocale(LC_CTYPE, 'C'); + $string = strtoupper($string); + setlocale(LC_CTYPE, $language); + return $string; + } + + /** + * Write debug text to the current debug output handler. + * + * @param string $message Debug message text. + * + * @return void + */ + function _debug($message) + { + if ($this->_debug) { + if ($this->_debug_handler) { + call_user_func_array($this->_debug_handler, array(&$this, $message)); + } else { + echo "$message\n"; + } + } + } +} |