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ManageSieve.php
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ManageSieve.php
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<?php
/**
* Copyright 2002-2003 Richard Heyes
* Copyright 2006-2008 Anish Mistry
* Copyright 2009-2015 Horde LLC (http://www.horde.org/)
*
* See the enclosed file LICENSE for license information (BSD). If you
* did not receive this file, see http://www.horde.org/licenses/bsd.
*
* @package ManageSieve
* @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>
* @license http://www.horde.org/licenses/bsd BSD
*/
namespace Horde;
use Horde\Socket\Client;
use Horde\ManageSieve;
use Horde\ManageSieve\Exception;
/**
* This class implements the ManageSieve protocol (RFC 5804).
*
* @package ManageSieve
* @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
* @copyright 2009-2015 Horde LLC
* @license http://www.horde.org/licenses/bsd BSD
* @link http://tools.ietf.org/html/rfc5804 RFC 5804 A Protocol for
* Remotely Managing Sieve Scripts
*/
class ManageSieve
{
/**
* Client is disconnected.
*/
const STATE_DISCONNECTED = 1;
/**
* Client is connected but not authenticated.
*/
const STATE_NON_AUTHENTICATED = 2;
/**
* Client is authenticated.
*/
const STATE_AUTHENTICATED = 3;
/**
* Authentication with the best available method.
*/
const AUTH_AUTOMATIC = 0;
/**
* DIGEST-MD5 authentication.
*/
const AUTH_DIGESTMD5 = 'DIGEST-MD5';
/**
* CRAM-MD5 authentication.
*/
const AUTH_CRAMMD5 = 'CRAM-MD5';
/**
* LOGIN authentication.
*/
const AUTH_LOGIN = 'LOGIN';
/**
* PLAIN authentication.
*/
const AUTH_PLAIN = 'PLAIN';
/**
* EXTERNAL authentication.
*/
const AUTH_EXTERNAL = 'EXTERNAL';
/**
* The authentication methods this class supports.
*
* Can be overwritten if having problems with certain methods.
*
* @var array
*/
public $supportedAuthMethods = array(
self::AUTH_DIGESTMD5,
self::AUTH_CRAMMD5,
self::AUTH_EXTERNAL,
self::AUTH_PLAIN,
self::AUTH_LOGIN,
);
/**
* SASL authentication methods that require Auth_SASL.
*
* @var array
*/
public $supportedSASLAuthMethods = array(
self::AUTH_DIGESTMD5,
self::AUTH_CRAMMD5,
);
/**
* The socket client.
*
* @var \Horde\Socket\Client
*/
protected $_sock;
/**
* Parameters and connection information.
*
* @var array
*/
protected $_params;
/**
* Current state of the connection.
*
* One of the STATE_* constants.
*
* @var integer
*/
protected $_state = self::STATE_DISCONNECTED;
/**
* Logging handler.
*
* @var string|array
*/
protected $_logger;
/**
* Maximum number of referral loops
*
* @var array
*/
protected $_maxReferralCount = 15;
/**
* Constructor.
*
* If username and password are provided connects to the server and logs
* in too.
*
* @param array $params A hash of connection parameters:
* - host: Hostname of server (DEFAULT: localhost).
* Optionally prefixed with protocol scheme.
* - port: Port of server (DEFAULT: 4190).
* - user: Login username (optional).
* - password: Login password (optional).
* - authmethod: Type of login to perform (see
* $supportedAuthMethods) (DEFAULT:
* AUTH_AUTOMATIC).
* - euser: Effective user. If authenticating as an
* administrator, login as this user.
* - bypassauth: Skip the authentication phase.
* Useful if passing an already open
* socket.
* - usetls: Use TLS if available.
* - context: Additional options for
* stream_context_create().
* - logger: A log handler, must implement debug().
*
* @throws \Horde\ManageSieve\Exception
*/
public function __construct($params = array())
{
$this->_params = array_merge(
array(
'host' => 'localhost',
'port' => 4190,
'user' => '',
'password' => '',
'authmethod' => self::AUTH_AUTOMATIC,
'euser' => null,
'bypassauth' => false,
'usetls' => true,
'context' => array(),
'logger' => null,
),
$params
);
/* Try to include the Auth_SASL package. If the package is not
* available, we disable the authentication methods that depend upon
* it. */
if (!class_exists('Auth_SASL')) {
$this->_debug('Auth_SASL not present');
$this->supportedAuthMethods = array_diff(
$this->supportedAuthMethods,
$this->supportedSASLAuthMethods
);
}
if ($this->_params['logger']) {
$this->setLogger($this->_params['logger']);
}
if (strlen($this->_params['user']) &&
strlen($this->_params['password'])) {
$this->_handleConnectAndLogin();
}
}
/**
* Passes a logger for debug logging.
*
* @param object $logger A log handler, must implement debug().
*/
public function setLogger($logger)
{
$this->_logger = $logger;
}
/**
* Connects to the server and logs in.
*
* @throws \Horde\ManageSieve\Exception
*/
protected function _handleConnectAndLogin()
{
$this->connect(
$this->_params['host'],
$this->_params['port'],
$this->_params['context'],
$this->_params['usetls']
);
if (!$this->_params['bypassauth']) {
$this->login(
$this->_params['user'],
$this->_params['password'],
$this->_params['authmethod'],
$this->_params['euser']
);
}
}
/**
* Handles connecting to the server and checks the response validity.
*
* Defaults from the constructor are used for missing parameters.
*
* @param string $host Hostname of server.
* @param string $port Port of server.
* @param array $context List of options to pass to
* stream_context_create().
* @param boolean $useTLS Use TLS if available.
*
* @throws \Horde\ManageSieve\Exception
*/
public function connect(
$host = null, $port = null, $context = null, $useTLS = null
)
{
if (isset($host)) {
$this->_params['host'] = $host;
}
if (isset($port)) {
$this->_params['port'] = $port;
}
if (isset($context)) {
$this->_params['context'] = array_merge_recursive(
$this->_params['context'],
$context
);
}
if (isset($useTLS)) {
$this->_params['usetls'] = $useTLS;
}
if (self::STATE_DISCONNECTED != $this->_state) {
throw new NotDisconnected();
}
try {
$this->_sock = new Client(
$this->_params['host'],
$this->_params['port'],
5,
$this->_params['usetls'],
$this->_params['context']
);
} catch (Client\Exception $e) {
throw new Exception($e);
}
if ($this->_params['bypassauth']) {
$this->_state = self::STATE_AUTHENTICATED;
} else {
$this->_state = self::STATE_NON_AUTHENTICATED;
$this->_doCmd();
}
// Explicitly ask for the capabilities in case the connection is
// picked up from an existing connection.
try {
$this->_cmdCapability();
} catch (Exception $e) {
throw new ConnectionFailed($e);
}
// Check if we can enable TLS via STARTTLS.
if ($this->_params['usetls'] &&
!empty($this->_capability['starttls'])) {
$this->_doCmd('STARTTLS');
if (!$this->_sock->startTls()) {
throw new Exception('Failed to establish TLS connection');
}
// The server should be sending a CAPABILITY response after
// negotiating TLS. Read it, and ignore if it doesn't.
// Unfortunately old Cyrus versions are broken and don't send a
// CAPABILITY response, thus we would wait here forever. Parse the
// Cyrus version and work around this broken behavior.
if (!preg_match('/^CYRUS TIMSIEVED V([0-9.]+)/', $this->_capability['implementation'], $matches) ||
version_compare($matches[1], '2.3.10', '>=')) {
$this->_doCmd();
}
// Query the server capabilities again now that we are under
// encryption.
try {
$this->_cmdCapability();
} catch (Exception $e) {
throw new ConnectionFailed($e);
}
}
}
/**
* Disconnect from the Sieve server.
*
* @param boolean $sendLogoutCMD Whether to send LOGOUT command before
* disconnecting.
*
* @throws \Horde\ManageSieve\Exception
*/
public function disconnect($sendLogoutCMD = true)
{
$this->_cmdLogout($sendLogoutCMD);
}
/**
* Logs into server.
*
* Defaults from the constructor are used for missing parameters.
*
* @param string $user Login username.
* @param string $pass Login password.
* @param string $authmethod Type of login method to use.
* @param string $euser Effective UID (perform on behalf of $euser).
*
* @throws \Horde\ManageSieve\Exception
*/
public function login(
$user = null, $password = null, $authmethod = null, $euser = null
)
{
if (isset($user)) {
$this->_params['user'] = $user;
}
if (isset($user)) {
$this->_params['password'] = $password;
}
if (isset($user)) {
$this->_params['authmethod'] = $authmethod;
}
if (isset($user)) {
$this->_params['euser'] = $euser;
}
$this->_checkConnected();
if (self::STATE_AUTHENTICATED == $this->_state) {
throw new Exception('Already authenticated');
}
$this->_cmdAuthenticate(
$this->_params['user'],
$this->_params['password'],
$this->_params['authmethod'],
$this->_params['euser']
);
$this->_state = self::STATE_AUTHENTICATED;
}
/**
* Returns an indexed array of scripts currently on the server.
*
* @return array Indexed array of scriptnames.
*/
public function listScripts()
{
if (is_array($scripts = $this->_cmdListScripts())) {
return $scripts[0];
} else {
return $scripts;
}
}
/**
* Returns the active script.
*
* @return string The active scriptname.
*/
public function getActive()
{
if (is_array($scripts = $this->_cmdListScripts())) {
return $scripts[1];
}
}
/**
* Sets the active script.
*
* @param string $scriptname The name of the script to be set as active.
*
* @throws \Horde\ManageSieve\Exception
*/
public function setActive($scriptname)
{
$this->_cmdSetActive($scriptname);
}
/**
* Retrieves a script.
*
* @param string $scriptname The name of the script to be retrieved.
*
* @throws \Horde\ManageSieve\Exception
* @return string The script.
*/
public function getScript($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 $makeactive Whether to make this the active script.
*
* @throws \Horde\ManageSieve\Exception
*/
public function installScript($scriptname, $script, $makeactive = false)
{
$this->_cmdPutScript($scriptname, $script);
if ($makeactive) {
$this->_cmdSetActive($scriptname);
}
}
/**
* Removes a script from the server.
*
* @param string $scriptname Name of the script.
*
* @throws \Horde\ManageSieve\Exception
*/
public function removeScript($scriptname)
{
$this->_cmdDeleteScript($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 $size The size of the script.
*
* @throws \Horde\ManageSieve\Exception
* @return boolean True if there is space.
*/
public function hasSpace($scriptname, $size)
{
$this->_checkAuthenticated();
try {
$this->_doCmd(
sprintf('HAVESPACE %s %d', $this->_escape($scriptname), $size)
);
} catch (Exception $e) {
return false;
}
return true;
}
/**
* Returns the list of extensions the server supports.
*
* @throws \Horde\ManageSieve\Exception
* @return array List of extensions.
*/
public function getExtensions()
{
$this->_checkConnected();
return $this->_capability['extensions'];
}
/**
* Returns whether the server supports an extension.
*
* @param string $extension The extension to check.
*
* @throws \Horde\ManageSieve\Exception
* @return boolean Whether the extension is supported.
*/
public function hasExtension($extension)
{
$this->_checkConnected();
$extension = trim($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.
*
* @throws \Horde\ManageSieve\Exception
* @return array List of authentication methods.
*/
public function getAuthMechs()
{
$this->_checkConnected();
return $this->_capability['sasl'];
}
/**
* Returns whether the server supports an authentication method.
*
* @param string $method The method to check.
*
* @throws \Horde\ManageSieve\Exception
* @return boolean Whether the method is supported.
*/
public function hasAuthMech($method)
{
$this->_checkConnected();
$method = trim($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 $authmethod The method to use. If empty, the class chooses
* the best (strongest) available method.
* @param string $euser The effective uid to authenticate as.
*
* @throws \Horde\ManageSieve\Exception
*/
protected function _cmdAuthenticate(
$uid, $pwd, $authmethod = null, $euser = ''
)
{
$method = $this->_getBestAuthMethod($authmethod);
switch ($method) {
case self::AUTH_DIGESTMD5:
$this->_authDigestMD5($uid, $pwd, $euser);
return;
case self::AUTH_CRAMMD5:
$this->_authCRAMMD5($uid, $pwd, $euser);
break;
case self::AUTH_LOGIN:
$this->_authLOGIN($uid, $pwd, $euser);
break;
case self::AUTH_PLAIN:
$this->_authPLAIN($uid, $pwd, $euser);
break;
case self::AUTH_EXTERNAL:
$this->_authEXTERNAL($uid, $pwd, $euser);
break;
default :
throw new Exception(
$method . ' is not a supported authentication method'
);
break;
}
$this->_doCmd();
// Query the server capabilities again now that we are authenticated.
try {
$this->_cmdCapability();
} catch (Exception $e) {
throw new ConnectionFailed($e);
}
}
/**
* 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 $euser The effective uid to authenticate as.
*
* @throws \Horde\ManageSieve\Exception
*/
protected function _authPLAIN($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 $euser The effective uid to authenticate as. Not used.
*
* @throws \Horde\ManageSieve\Exception
*/
protected function _authLOGIN($user, $pass, $euser)
{
$this->_sendCmd('AUTHENTICATE "LOGIN"');
$this->_doCmd('"' . base64_encode($user) . '"', true);
$this->_doCmd('"' . base64_encode($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 $euser The effective uid to authenticate as. Not used.
*
* @throws \Horde\ManageSieve\Exception
*/
protected function _authCRAMMD5($user, $pass, $euser)
{
$challenge = $this->_doCmd('AUTHENTICATE "CRAM-MD5"', true);
$challenge = base64_decode(trim($challenge));
$cram = Auth_SASL::factory('crammd5');
$response = $cram->getResponse($user, $pass, $challenge);
if (is_a($response, 'PEAR_Error')) {
throw new Exception($response);
}
$this->_sendStringResponse(base64_encode($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 $euser The effective uid to authenticate as.
*
* @throws \Horde\ManageSieve\Exception
*/
protected function _authDigestMD5($user, $pass, $euser)
{
$challenge = $this->_doCmd('AUTHENTICATE "DIGEST-MD5"', true);
$challenge = base64_decode(trim($challenge));
$digest = Auth_SASL::factory('digestmd5');
// @todo Really 'localhost'?
$response = $digest->getResponse(
$user, $pass, $challenge, 'localhost', 'sieve', $euser
);
if (is_a($response, 'PEAR_Error')) {
throw new Exception($response);
}
$this->_sendStringResponse(base64_encode($response));
$this->_doCmd('', true);
if ($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. */
$this->_sendStringResponse('');
$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 $euser The effective uid to authenticate as.
*
* @throws \Horde\ManageSieve\Exception
*/
protected function _authEXTERNAL($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 $scriptname Name of the script to delete.
*
* @throws \Horde\ManageSieve\Exception
*/
protected function _cmdDeleteScript($scriptname)
{
$this->_checkAuthenticated();
$this->_doCmd(sprintf('DELETESCRIPT %s', $this->_escape($scriptname)));
}
/**
* Retrieves the contents of the named script.
*
* @param string $scriptname Name of the script to retrieve.
*
* @throws \Horde\ManageSieve\Exception
* @return string The script.
*/
protected function _cmdGetScript($scriptname)
{
$this->_checkAuthenticated();
$result = $this->_doCmd(
sprintf('GETSCRIPT %s', $this->_escape($scriptname))
);
return preg_replace('/^{[0-9]+}\r\n/', '', $result);
}
/**
* Sets the active script, i.e. the one that gets run on new mail by the
* server.
*
* @param string $scriptname The name of the script to mark as active.
*
* @throws \Horde\ManageSieve\Exception
*/
protected function _cmdSetActive($scriptname)
{
$this->_checkAuthenticated();
$this->_doCmd(sprintf('SETACTIVE %s', $this->_escape($scriptname)));
}
/**
* Returns the list of scripts on the server.
*
* @throws \Horde\ManageSieve\Exception
* @return array An array with the list of scripts in the first element
* and the active script in the second element.
*/
protected function _cmdListScripts()
{
$this->_checkAuthenticated();
$result = $this->_doCmd('LISTSCRIPTS');
$scripts = array();
$activescript = null;
$result = explode("\r\n", $result);
foreach ($result as $value) {
if (preg_match('/^"(.*)"( ACTIVE)?$/i', $value, $matches)) {
$script_name = stripslashes($matches[1]);
$scripts[] = $script_name;
if (!empty($matches[2])) {
$activescript = $script_name;
}
}
}
return array($scripts, $activescript);
}
/**
* Adds a script to the server.
*
* @param string $scriptname Name of the new script.
* @param string $scriptdata The new script.
*
* @throws \Horde\ManageSieve\Exception
*/
protected function _cmdPutScript($scriptname, $scriptdata)
{
$this->_checkAuthenticated();
$command = sprintf(
"PUTSCRIPT %s {%d+}\r\n%s",
$this->_escape($scriptname),
strlen($scriptdata),
$scriptdata
);
$this->_doCmd($command);
}
/**
* Logs out of the server and terminates the connection.
*
* @param boolean $sendLogoutCMD Whether to send LOGOUT command before
* disconnecting.
*
* @throws \Horde\ManageSieve\Exception
*/
protected function _cmdLogout($sendLogoutCMD = true)
{
$this->_checkConnected();
if ($sendLogoutCMD) {
$this->_doCmd('LOGOUT');
}
$this->_sock->close();
$this->_state = self::STATE_DISCONNECTED;
}
/**
* Sends the CAPABILITY command
*
* @throws \Horde\ManageSieve\Exception
*/
protected function _cmdCapability()
{
$this->_checkConnected();
$result = $this->_doCmd('CAPABILITY');
$this->_parseCapability($result);
}
/**
* Parses the response from the CAPABILITY command and stores the result
* in $_capability.
*
* @param string $data The response from the capability command.
*/
protected function _parseCapability($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 $cmd The command to send.
*/
protected function _sendCmd($cmd)
{
$status = $this->_sock->getStatus();
if ($status['eof']) {
throw new Exception('Failed to write to socket: connection lost');
}
$this->_sock->write($cmd . "\r\n");
$this->_debug("C: $cmd");
}
/**
* Sends a string response to the server.
*
* @param string $str The string to send.
*/
protected function _sendStringResponse($str)
{
return $this->_sendCmd('{' . strlen($str) . "+}\r\n" . $str);
}
/**
* Receives a single line from the server.
*
* @return string The server response line.
*/
protected function _recvLn()
{
$lastline = rtrim($this->_sock->gets(8192));
$this->_debug("S: $lastline");
if ($lastline === '') {
throw new Exception('Failed to read from socket');
}
return $lastline;
}
/**
* Receives a number of bytes from the server.
*
* @param integer $length Number of bytes to read.
*
* @return string The server response.
*/
protected function _recvBytes($length)
{
$response = '';
$response_length = 0;
while ($response_length < $length) {
$response .= $this->_sock->read($length - $response_length);
$response_length = strlen($response);
}
$this->_debug('S: ' . rtrim($response));
return $response;
}
/**
* Send a command and retrieves a response from the server.
*
* @param string $cmd The command to send.
* @param boolean $auth Whether this is an authentication command.
*
* @throws \Horde\ManageSieve\Exception if a NO response.
* @return string Reponse string if an OK response.
*
*/
protected function _doCmd($cmd = '', $auth = false)
{
$referralCount = 0;
while ($referralCount < $this->_maxReferralCount) {
if (strlen($cmd)) {
$this->_sendCmd($cmd);
}
$response = '';
while (true) {
$line = $this->_recvLn();
if (preg_match('/^(OK|NO)/i', $line, $tag)) {
// Check for string literal message.
// DBMail has some broken versions that send the trailing
// plus even though it's disallowed.
if (preg_match('/{([0-9]+)\+?}$/', $line, $matches)) {
$line = substr($line, 0, -(strlen($matches[1]) + 2))
. str_replace(
"\r\n", ' ', $this->_recvBytes($matches[1] + 2)
);
}
if ('OK' == $this->_toUpper($tag[1])) {
$response .= $line;
return rtrim($response);
}
throw new Exception(trim($response . substr($line, 2)), 3);
}
if (preg_match('/^BYE/i', $line)) {
try {
$this->disconnect(false);
} catch (Exception $e) {
throw new Exception(