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<?php
/**
* @file CAS/client.php
* Main class of the phpCAS library
*/
// include internationalization stuff
include_once(dirname(__FILE__).'/languages/languages.php');
// include PGT storage classes
include_once(dirname(__FILE__).'/PGTStorage/pgt-main.php');
/**
* @class CASClient
* The CASClient class is a client interface that provides CAS authentication
* to PHP applications.
*
* @author Pascal Aubry <pascal.aubry at univ-rennes1.fr>
*/
class CASClient
{
// XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
// XX XX
// XX CONFIGURATION XX
// XX XX
// XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
// ########################################################################
// HTML OUTPUT
// ########################################################################
/**
* @addtogroup internalOutput
* @{
*/
/**
* This method filters a string by replacing special tokens by appropriate values
* and prints it. The corresponding tokens are taken into account:
* - __CAS_VERSION__
* - __PHPCAS_VERSION__
* - __SERVER_BASE_URL__
*
* Used by CASClient::PrintHTMLHeader() and CASClient::printHTMLFooter().
*
* @param $str the string to filter and output
*
* @private
*/
function HTMLFilterOutput($str)
{
$str = str_replace('__CAS_VERSION__',$this->getServerVersion(),$str);
$str = str_replace('__PHPCAS_VERSION__',phpCAS::getVersion(),$str);
$str = str_replace('__SERVER_BASE_URL__',$this->getServerBaseURL(),$str);
echo $str;
}
/**
* A string used to print the header of HTML pages. Written by CASClient::setHTMLHeader(),
* read by CASClient::printHTMLHeader().
*
* @hideinitializer
* @private
* @see CASClient::setHTMLHeader, CASClient::printHTMLHeader()
*/
var $_output_header = '';
/**
* This method prints the header of the HTML output (after filtering). If
* CASClient::setHTMLHeader() was not used, a default header is output.
*
* @param $title the title of the page
*
* @see HTMLFilterOutput()
* @private
*/
function printHTMLHeader($title)
{
$this->HTMLFilterOutput(str_replace('__TITLE__',
$title,
(empty($this->_output_header)
? '<html><head><title>__TITLE__</title></head><body><h1>__TITLE__</h1>'
: $this->_output_header)
)
);
}
/**
* A string used to print the footer of HTML pages. Written by CASClient::setHTMLFooter(),
* read by printHTMLFooter().
*
* @hideinitializer
* @private
* @see CASClient::setHTMLFooter, CASClient::printHTMLFooter()
*/
var $_output_footer = '';
/**
* This method prints the footer of the HTML output (after filtering). If
* CASClient::setHTMLFooter() was not used, a default footer is output.
*
* @see HTMLFilterOutput()
* @private
*/
function printHTMLFooter()
{
$this->HTMLFilterOutput(empty($this->_output_footer)
?('<hr><address>phpCAS __PHPCAS_VERSION__ '.$this->getString(CAS_STR_USING_SERVER).' <a href="__SERVER_BASE_URL__">__SERVER_BASE_URL__</a> (CAS __CAS_VERSION__)</a></address></body></html>')
:$this->_output_footer);
}
/**
* This method set the HTML header used for all outputs.
*
* @param $header the HTML header.
*
* @public
*/
function setHTMLHeader($header)
{
$this->_output_header = $header;
}
/**
* This method set the HTML footer used for all outputs.
*
* @param $footer the HTML footer.
*
* @public
*/
function setHTMLFooter($footer)
{
$this->_output_footer = $footer;
}
/** @} */
// ########################################################################
// INTERNATIONALIZATION
// ########################################################################
/**
* @addtogroup internalLang
* @{
*/
/**
* A string corresponding to the language used by phpCAS. Written by
* CASClient::setLang(), read by CASClient::getLang().
* @note debugging information is always in english (debug purposes only).
*
* @hideinitializer
* @private
* @sa CASClient::_strings, CASClient::getString()
*/
var $_lang = '';
/**
* This method returns the language used by phpCAS.
*
* @return a string representing the language
*
* @private
*/
function getLang()
{
if ( empty($this->_lang) )
$this->setLang(PHPCAS_LANG_DEFAULT);
return $this->_lang;
}
/**
* array containing the strings used by phpCAS. Written by CASClient::setLang(), read by
* CASClient::getString() and used by CASClient::setLang().
*
* @note This array is filled by instructions in CAS/languages/<$this->_lang>.php
*
* @private
* @see CASClient::_lang, CASClient::getString(), CASClient::setLang(), CASClient::getLang()
*/
var $_strings;
/**
* This method returns a string depending on the language.
*
* @param $str the index of the string in $_string.
*
* @return the string corresponding to $index in $string.
*
* @private
*/
function getString($str)
{
// call CASclient::getLang() to be sure the language is initialized
$this->getLang();
if ( !isset($this->_strings[$str]) ) {
trigger_error('string `'.$str.'\' not defined for language `'.$this->getLang().'\'',E_USER_ERROR);
}
return $this->_strings[$str];
}
/**
* This method is used to set the language used by phpCAS.
* @note Can be called only once.
*
* @param $lang a string representing the language.
*
* @public
* @sa CAS_LANG_FRENCH, CAS_LANG_ENGLISH
*/
function setLang($lang)
{
// include the corresponding language file
include_once(dirname(__FILE__).'/languages/'.$lang.'.php');
if ( !is_array($this->_strings) ) {
trigger_error('language `'.$lang.'\' is not implemented',E_USER_ERROR);
}
$this->_lang = $lang;
}
/** @} */
// ########################################################################
// CAS SERVER CONFIG
// ########################################################################
/**
* @addtogroup internalConfig
* @{
*/
/**
* a record to store information about the CAS server.
* - $_server["version"]: the version of the CAS server
* - $_server["hostname"]: the hostname of the CAS server
* - $_server["port"]: the port the CAS server is running on
* - $_server["uri"]: the base URI the CAS server is responding on
* - $_server["base_url"]: the base URL of the CAS server
* - $_server["login_url"]: the login URL of the CAS server
* - $_server["service_validate_url"]: the service validating URL of the CAS server
* - $_server["proxy_url"]: the proxy URL of the CAS server
* - $_server["proxy_validate_url"]: the proxy validating URL of the CAS server
* - $_server["logout_url"]: the logout URL of the CAS server
*
* $_server["version"], $_server["hostname"], $_server["port"] and $_server["uri"]
* are written by CASClient::CASClient(), read by CASClient::getServerVersion(),
* CASClient::getServerHostname(), CASClient::getServerPort() and CASClient::getServerURI().
*
* The other fields are written and read by CASClient::getServerBaseURL(),
* CASClient::getServerLoginURL(), CASClient::getServerServiceValidateURL(),
* CASClient::getServerProxyValidateURL() and CASClient::getServerLogoutURL().
*
* @hideinitializer
* @private
*/
var $_server = array(
'version' => -1,
'hostname' => 'none',
'port' => -1,
'uri' => 'none'
);
/**
* This method is used to retrieve the version of the CAS server.
* @return the version of the CAS server.
* @private
*/
function getServerVersion()
{
return $this->_server['version'];
}
/**
* This method is used to retrieve the hostname of the CAS server.
* @return the hostname of the CAS server.
* @private
*/
function getServerHostname()
{ return $this->_server['hostname']; }
/**
* This method is used to retrieve the port of the CAS server.
* @return the port of the CAS server.
* @private
*/
function getServerPort()
{ return $this->_server['port']; }
/**
* This method is used to retrieve the URI of the CAS server.
* @return a URI.
* @private
*/
function getServerURI()
{ return $this->_server['uri']; }
/**
* This method is used to retrieve the base URL of the CAS server.
* @return a URL.
* @private
*/
function getServerBaseURL()
{
// the URL is build only when needed
if ( empty($this->_server['base_url']) ) {
$this->_server['base_url'] = 'https://'
.$this->getServerHostname()
.':'
.$this->getServerPort()
.$this->getServerURI();
}
return $this->_server['base_url'];
}
/**
* This method is used to retrieve the login URL of the CAS server.
* @param $gateway true to check authentication, false to force it
* @param $renew true to force the authentication with the CAS server
* NOTE : It is recommended that CAS implementations ignore the
"gateway" parameter if "renew" is set
* @return a URL.
* @private
*/
function getServerLoginURL($gateway=false,$renew=false) {
phpCAS::traceBegin();
// the URL is build only when needed
if ( empty($this->_server['login_url']) ) {
$this->_server['login_url'] = $this->getServerBaseURL();
$this->_server['login_url'] .= 'login?service=';
// $this->_server['login_url'] .= preg_replace('/&/','%26',$this->getURL());
$this->_server['login_url'] .= urlencode($this->getURL());
if($renew) {
// It is recommended that when the "renew" parameter is set, its value be "true"
$this->_server['login_url'] .= '&renew=true';
} elseif ($gateway) {
// It is recommended that when the "gateway" parameter is set, its value be "true"
$this->_server['login_url'] .= '&gateway=true';
}
}
phpCAS::traceEnd($this->_server['login_url']);
return $this->_server['login_url'];
}
/**
* This method sets the login URL of the CAS server.
* @param $url the login URL
* @private
* @since 0.4.21 by Wyman Chan
*/
function setServerLoginURL($url)
{
return $this->_server['login_url'] = $url;
}
/**
* This method is used to retrieve the service validating URL of the CAS server.
* @return a URL.
* @private
*/
function getServerServiceValidateURL()
{
// the URL is build only when needed
if ( empty($this->_server['service_validate_url']) ) {
switch ($this->getServerVersion()) {
case CAS_VERSION_1_0:
$this->_server['service_validate_url'] = $this->getServerBaseURL().'validate';
break;
case CAS_VERSION_2_0:
$this->_server['service_validate_url'] = $this->getServerBaseURL().'serviceValidate';
break;
}
}
// return $this->_server['service_validate_url'].'?service='.preg_replace('/&/','%26',$this->getURL());
return $this->_server['service_validate_url'].'?service='.urlencode($this->getURL());
}
/**
* This method is used to retrieve the proxy validating URL of the CAS server.
* @return a URL.
* @private
*/
function getServerProxyValidateURL()
{
// the URL is build only when needed
if ( empty($this->_server['proxy_validate_url']) ) {
switch ($this->getServerVersion()) {
case CAS_VERSION_1_0:
$this->_server['proxy_validate_url'] = '';
break;
case CAS_VERSION_2_0:
$this->_server['proxy_validate_url'] = $this->getServerBaseURL().'proxyValidate';
break;
}
}
// return $this->_server['proxy_validate_url'].'?service='.preg_replace('/&/','%26',$this->getURL());
return $this->_server['proxy_validate_url'].'?service='.urlencode($this->getURL());
}
/**
* This method is used to retrieve the proxy URL of the CAS server.
* @return a URL.
* @private
*/
function getServerProxyURL()
{
// the URL is build only when needed
if ( empty($this->_server['proxy_url']) ) {
switch ($this->getServerVersion()) {
case CAS_VERSION_1_0:
$this->_server['proxy_url'] = '';
break;
case CAS_VERSION_2_0:
$this->_server['proxy_url'] = $this->getServerBaseURL().'proxy';
break;
}
}
return $this->_server['proxy_url'];
}
/**
* This method is used to retrieve the logout URL of the CAS server.
* @return a URL.
* @private
*/
function getServerLogoutURL()
{
// the URL is build only when needed
if ( empty($this->_server['logout_url']) ) {
$this->_server['logout_url'] = $this->getServerBaseURL().'logout';
}
return $this->_server['logout_url'];
}
/**
* This method sets the logout URL of the CAS server.
* @param $url the logout URL
* @private
* @since 0.4.21 by Wyman Chan
*/
function setServerLogoutURL($url)
{
return $this->_server['logout_url'] = $url;
}
/**
* An array to store extra curl options.
*/
var $_curl_options = array();
/**
* This method is used to set additional user curl options.
*/
function setExtraCurlOption($key, $value)
{
$this->_curl_options[$key] = $value;
}
/**
* This method checks to see if the request is secured via HTTPS
* @return true if https, false otherwise
* @private
*/
function isHttps() {
//if ( isset($_SERVER['HTTPS']) && !empty($_SERVER['HTTPS']) ) {
//0.4.24 by Hinnack
if ( isset($_SERVER['HTTPS']) && !empty($_SERVER['HTTPS']) && $_SERVER['HTTPS'] == 'on') {
return true;
} else {
return false;
}
}
// ########################################################################
// CONSTRUCTOR
// ########################################################################
/**
* CASClient constructor.
*
* @param $server_version the version of the CAS server
* @param $proxy TRUE if the CAS client is a CAS proxy, FALSE otherwise
* @param $server_hostname the hostname of the CAS server
* @param $server_port the port the CAS server is running on
* @param $server_uri the URI the CAS server is responding on
* @param $start_session Have phpCAS start PHP sessions (default true)
*
* @return a newly created CASClient object
*
* @public
*/
function CASClient(
$server_version,
$proxy,
$server_hostname,
$server_port,
$server_uri,
$start_session = true) {
phpCAS::traceBegin();
if (!$this->isLogoutRequest() && !empty($_GET['ticket']) && $start_session) {
// copy old session vars and destroy the current session
if (!isset($_SESSION)) {
session_start();
}
$old_session = $_SESSION;
session_destroy();
// set up a new session, of name based on the ticket
$session_id = preg_replace('/[^\w]/','',$_GET['ticket']);
phpCAS::LOG("Session ID: " . $session_id);
session_id($session_id);
if (!isset($_SESSION)) {
session_start();
}
// restore old session vars
$_SESSION = $old_session;
// Redirect to location without ticket.
header('Location: '.$this->getURL());
}
//activate session mechanism if desired
if (!$this->isLogoutRequest() && $start_session) {
session_start();
}
$this->_proxy = $proxy;
//check version
switch ($server_version) {
case CAS_VERSION_1_0:
if ( $this->isProxy() )
phpCAS::error('CAS proxies are not supported in CAS '
.$server_version);
break;
case CAS_VERSION_2_0:
break;
default:
phpCAS::error('this version of CAS (`'
.$server_version
.'\') is not supported by phpCAS '
.phpCAS::getVersion());
}
$this->_server['version'] = $server_version;
//check hostname
if ( empty($server_hostname)
|| !preg_match('/[\.\d\-abcdefghijklmnopqrstuvwxyz]*/',$server_hostname) ) {
phpCAS::error('bad CAS server hostname (`'.$server_hostname.'\')');
}
$this->_server['hostname'] = $server_hostname;
//check port
if ( $server_port == 0
|| !is_int($server_port) ) {
phpCAS::error('bad CAS server port (`'.$server_hostname.'\')');
}
$this->_server['port'] = $server_port;
//check URI
if ( !preg_match('/[\.\d\-_abcdefghijklmnopqrstuvwxyz\/]*/',$server_uri) ) {
phpCAS::error('bad CAS server URI (`'.$server_uri.'\')');
}
//add leading and trailing `/' and remove doubles
$server_uri = preg_replace('/\/\//','/','/'.$server_uri.'/');
$this->_server['uri'] = $server_uri;
//set to callback mode if PgtIou and PgtId CGI GET parameters are provided
if ( $this->isProxy() ) {
$this->setCallbackMode(!empty($_GET['pgtIou'])&&!empty($_GET['pgtId']));
}
if ( $this->isCallbackMode() ) {
//callback mode: check that phpCAS is secured
if ( !$this->isHttps() ) {
phpCAS::error('CAS proxies must be secured to use phpCAS; PGT\'s will not be received from the CAS server');
}
} else {
//normal mode: get ticket and remove it from CGI parameters for developpers
$ticket = (isset($_GET['ticket']) ? $_GET['ticket'] : null);
switch ($this->getServerVersion()) {
case CAS_VERSION_1_0: // check for a Service Ticket
if( preg_match('/^ST-/',$ticket) ) {
phpCAS::trace('ST \''.$ticket.'\' found');
//ST present
$this->setST($ticket);
//ticket has been taken into account, unset it to hide it to applications
unset($_GET['ticket']);
} else if ( !empty($ticket) ) {
//ill-formed ticket, halt
phpCAS::error('ill-formed ticket found in the URL (ticket=`'.htmlentities($ticket).'\')');
}
break;
case CAS_VERSION_2_0: // check for a Service or Proxy Ticket
if( preg_match('/^[SP]T-/',$ticket) ) {
phpCAS::trace('ST or PT \''.$ticket.'\' found');
$this->setPT($ticket);
unset($_GET['ticket']);
} else if ( !empty($ticket) ) {
//ill-formed ticket, halt
phpCAS::error('ill-formed ticket found in the URL (ticket=`'.htmlentities($ticket).'\')');
}
break;
}
}
phpCAS::traceEnd();
}
/** @} */
// XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
// XX XX
// XX AUTHENTICATION XX
// XX XX
// XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
/**
* @addtogroup internalAuthentication
* @{
*/
/**
* The Authenticated user. Written by CASClient::setUser(), read by CASClient::getUser().
* @attention client applications should use phpCAS::getUser().
*
* @hideinitializer
* @private
*/
var $_user = '';
/**
* This method sets the CAS user's login name.
*
* @param $user the login name of the authenticated user.
*
* @private
*/
function setUser($user)
{
$this->_user = $user;
}
/**
* This method returns the CAS user's login name.
* @warning should be called only after CASClient::forceAuthentication() or
* CASClient::isAuthenticated(), otherwise halt with an error.
*
* @return the login name of the authenticated user
*/
function getUser()
{
if ( empty($this->_user) ) {
phpCAS::error('this method should be used only after '.__CLASS__.'::forceAuthentication() or '.__CLASS__.'::isAuthenticated()');
}
return $this->_user;
}
/**
* This method is called to renew the authentication of the user
* If the user is authenticated, renew the connection
* If not, redirect to CAS
* @public
*/
function renewAuthentication(){
phpCAS::traceBegin();
// Either way, the user is authenticated by CAS
if( isset( $_SESSION['phpCAS']['auth_checked'] ) )
unset($_SESSION['phpCAS']['auth_checked']);
if ( $this->isAuthenticated() ) {
phpCAS::trace('user already authenticated; renew');
$this->redirectToCas(false,true);
} else {
$this->redirectToCas();
}
phpCAS::traceEnd();
}
/**
* This method is called to be sure that the user is authenticated. When not
* authenticated, halt by redirecting to the CAS server; otherwise return TRUE.
* @return TRUE when the user is authenticated; otherwise halt.
* @public
*/
function forceAuthentication()
{
phpCAS::traceBegin();
if ( $this->isAuthenticated() ) {
// the user is authenticated, nothing to be done.
phpCAS::trace('no need to authenticate');
$res = TRUE;
} else {
// the user is not authenticated, redirect to the CAS server
if (isset($_SESSION['phpCAS']['auth_checked'])) {
unset($_SESSION['phpCAS']['auth_checked']);
}
$this->redirectToCas(FALSE/* no gateway */);
// never reached
$res = FALSE;
}
phpCAS::traceEnd($res);
return $res;
}
/**
* An integer that gives the number of times authentication will be cached before rechecked.
*
* @hideinitializer
* @private
*/
var $_cache_times_for_auth_recheck = 0;
/**
* Set the number of times authentication will be cached before rechecked.
*
* @param $n an integer.
*
* @public
*/
function setCacheTimesForAuthRecheck($n)
{
$this->_cache_times_for_auth_recheck = $n;
}
/**
* This method is called to check whether the user is authenticated or not.
* @return TRUE when the user is authenticated, FALSE otherwise.
* @public
*/
function checkAuthentication()
{
phpCAS::traceBegin();
if ( $this->isAuthenticated() ) {
phpCAS::trace('user is authenticated');
$res = TRUE;
} else if (isset($_SESSION['phpCAS']['auth_checked'])) {
// the previous request has redirected the client to the CAS server with gateway=true
unset($_SESSION['phpCAS']['auth_checked']);
$res = FALSE;
} else {
// $_SESSION['phpCAS']['auth_checked'] = true;
// $this->redirectToCas(TRUE/* gateway */);
// // never reached
// $res = FALSE;
// avoid a check against CAS on every request
if (! isset($_SESSION['phpCAS']['unauth_count']) )
$_SESSION['phpCAS']['unauth_count'] = -2; // uninitialized
if (($_SESSION['phpCAS']['unauth_count'] != -2 && $this->_cache_times_for_auth_recheck == -1)
|| ($_SESSION['phpCAS']['unauth_count'] >= 0 && $_SESSION['phpCAS']['unauth_count'] < $this->_cache_times_for_auth_recheck))
{
$res = FALSE;
if ($this->_cache_times_for_auth_recheck != -1)
{
$_SESSION['phpCAS']['unauth_count']++;
phpCAS::trace('user is not authenticated (cached for '.$_SESSION['phpCAS']['unauth_count'].' times of '.$this->_cache_times_for_auth_recheck.')');
}
else
{
phpCAS::trace('user is not authenticated (cached for until login pressed)');
}
}
else
{
$_SESSION['phpCAS']['unauth_count'] = 0;
$_SESSION['phpCAS']['auth_checked'] = true;
phpCAS::trace('user is not authenticated (cache reset)');
$this->redirectToCas(TRUE/* gateway */);
// never reached
$res = FALSE;
}
}
phpCAS::traceEnd($res);
return $res;
}
/**
* This method is called to check if the user is authenticated (previously or by
* tickets given in the URL).
*
* @return TRUE when the user is authenticated.
*
* @public
*/
function isAuthenticated()
{
phpCAS::traceBegin();
$res = FALSE;
$validate_url = '';
if ( $this->wasPreviouslyAuthenticated() ) {
// the user has already (previously during the session) been
// authenticated, nothing to be done.
phpCAS::trace('user was already authenticated, no need to look for tickets');
$res = TRUE;
}
elseif ( $this->hasST() ) {
// if a Service Ticket was given, validate it
phpCAS::trace('ST `'.$this->getST().'\' is present');
$this->validateST($validate_url,$text_response,$tree_response); // if it fails, it halts
phpCAS::trace('ST `'.$this->getST().'\' was validated');
if ( $this->isProxy() ) {
$this->validatePGT($validate_url,$text_response,$tree_response); // idem
phpCAS::trace('PGT `'.$this->getPGT().'\' was validated');
$_SESSION['phpCAS']['pgt'] = $this->getPGT();
}
$_SESSION['phpCAS']['user'] = $this->getUser();
$res = TRUE;
}
elseif ( $this->hasPT() ) {
// if a Proxy Ticket was given, validate it
phpCAS::trace('PT `'.$this->getPT().'\' is present');
$this->validatePT($validate_url,$text_response,$tree_response); // note: if it fails, it halts
phpCAS::trace('PT `'.$this->getPT().'\' was validated');
if ( $this->isProxy() ) {
$this->validatePGT($validate_url,$text_response,$tree_response); // idem
phpCAS::trace('PGT `'.$this->getPGT().'\' was validated');
$_SESSION['phpCAS']['pgt'] = $this->getPGT();
}
$_SESSION['phpCAS']['user'] = $this->getUser();
$res = TRUE;
}
else {
// no ticket given, not authenticated
phpCAS::trace('no ticket found');
}
phpCAS::traceEnd($res);
return $res;
}
/**
* This method tells if the current session is authenticated.
* @return true if authenticated based soley on $_SESSION variable
* @since 0.4.22 by Brendan Arnold
*/
function isSessionAuthenticated ()
{
return !empty($_SESSION['phpCAS']['user']);
}
/**
* This method tells if the user has already been (previously) authenticated
* by looking into the session variables.
*
* @note This function switches to callback mode when needed.
*
* @return TRUE when the user has already been authenticated; FALSE otherwise.
*
* @private
*/
function wasPreviouslyAuthenticated()
{
phpCAS::traceBegin();
if ( $this->isCallbackMode() ) {
$this->callback();
}
$auth = FALSE;
if ( $this->isProxy() ) {
// CAS proxy: username and PGT must be present
if ( $this->isSessionAuthenticated() && !empty($_SESSION['phpCAS']['pgt']) ) {
// authentication already done
$this->setUser($_SESSION['phpCAS']['user']);
$this->setPGT($_SESSION['phpCAS']['pgt']);
phpCAS::trace('user = `'.$_SESSION['phpCAS']['user'].'\', PGT = `'.$_SESSION['phpCAS']['pgt'].'\'');
$auth = TRUE;
} elseif ( $this->isSessionAuthenticated() && empty($_SESSION['phpCAS']['pgt']) ) {
// these two variables should be empty or not empty at the same time
phpCAS::trace('username found (`'.$_SESSION['phpCAS']['user'].'\') but PGT is empty');
// unset all tickets to enforce authentication
unset($_SESSION['phpCAS']);
$this->setST('');
$this->setPT('');
} elseif ( !$this->isSessionAuthenticated() && !empty($_SESSION['phpCAS']['pgt']) ) {
// these two variables should be empty or not empty at the same time
phpCAS::trace('PGT found (`'.$_SESSION['phpCAS']['pgt'].'\') but username is empty');
// unset all tickets to enforce authentication
unset($_SESSION['phpCAS']);
$this->setST('');
$this->setPT('');
} else {
phpCAS::trace('neither user not PGT found');
}
} else {
// `simple' CAS client (not a proxy): username must be present
if ( $this->isSessionAuthenticated() ) {
// authentication already done
$this->setUser($_SESSION['phpCAS']['user']);
phpCAS::trace('user = `'.$_SESSION['phpCAS']['user'].'\'');
$auth = TRUE;
} else {
phpCAS::trace('no user found');
}
}
phpCAS::traceEnd($auth);
return $auth;
}
/**
* This method is used to redirect the client to the CAS server.
* It is used by CASClient::forceAuthentication() and CASClient::checkAuthentication().
* @param $gateway true to check authentication, false to force it
* @param $renew true to force the authentication with the CAS server
* @public
*/
function redirectToCas($gateway=false,$renew=false){
phpCAS::traceBegin();
$cas_url = $this->getServerLoginURL($gateway,$renew);
header('Location: '.$cas_url);
phpCAS::log( "Redirect to : ".$cas_url );
$this->printHTMLHeader($this->getString(CAS_STR_AUTHENTICATION_WANTED));
printf('<p>'.$this->getString(CAS_STR_SHOULD_HAVE_BEEN_REDIRECTED).'</p>',$cas_url);
$this->printHTMLFooter();
phpCAS::traceExit();
exit();
}
// /**
// * This method is used to logout from CAS.
// * @param $url a URL that will be transmitted to the CAS server (to come back to when logged out)
// * @public
// */
// function logout($url = "") {
// phpCAS::traceBegin();
// $cas_url = $this->getServerLogoutURL();
// // v0.4.14 sebastien.gougeon at univ-rennes1.fr
// // header('Location: '.$cas_url);
// if ( $url != "" ) {
// // Adam Moore 1.0.0RC2
// $url = '?service=' . $url . '&url=' . $url;
// }
// header('Location: '.$cas_url . $url);
// session_unset();
// session_destroy();
// $this->printHTMLHeader($this->getString(CAS_STR_LOGOUT));
// printf('<p>'.$this->getString(CAS_STR_SHOULD_HAVE_BEEN_REDIRECTED).'</p>',$cas_url);
// $this->printHTMLFooter();
// phpCAS::traceExit();
// exit();
// }
/**
* This method is used to logout from CAS.
* @params $params an array that contains the optional url and service parameters that will be passed to the CAS server
* @public
*/
function logout($params) {
phpCAS::traceBegin();
$cas_url = $this->getServerLogoutURL();
$paramSeparator = '?';
if (isset($params['url'])) {
$cas_url = $cas_url . $paramSeparator . "url=" . urlencode($params['url']);
$paramSeparator = '&';
}
if (isset($params['service'])) {
$cas_url = $cas_url . $paramSeparator . "service=" . urlencode($params['service']);
}
header('Location: '.$cas_url);
session_unset();
session_destroy();
$this->printHTMLHeader($this->getString(CAS_STR_LOGOUT));
printf('<p>'.$this->getString(CAS_STR_SHOULD_HAVE_BEEN_REDIRECTED).'</p>',$cas_url);
$this->printHTMLFooter();
phpCAS::traceExit();
exit();
}
/**
* @return true if the current request is a logout request.
* @private
*/
function isLogoutRequest() {
return !empty($_POST['logoutRequest']);
}
/**
* @return true if a logout request is allowed.
* @private
*/
function isLogoutRequestAllowed() {
}
/**
* This method handles logout requests.
* @param $check_client true to check the client bofore handling the request,
* false not to perform any access control. True by default.
* @param $allowed_clients an array of host names allowed to send logout requests.
* By default, only the CAs server (declared in the constructor) will be allowed.
* @public
*/
function handleLogoutRequests($check_client=true, $allowed_clients=false) {
phpCAS::traceBegin();
if (!$this->isLogoutRequest()) {
phpCAS::log("Not a logout request");
phpCAS::traceEnd();
return;
}
phpCAS::log("Logout requested");
phpCAS::log("SAML REQUEST: ".$_POST['logoutRequest']);
if ($check_client) {
if (!$allowed_clients) {
$allowed_clients = array( $this->getServerHostname() );
}
$client_ip = $_SERVER['REMOTE_ADDR'];
$client = gethostbyaddr($client_ip);
phpCAS::log("Client: ".$client);
$allowed = false;
foreach ($allowed_clients as $allowed_client) {
if ($client == $allowed_client) {
phpCAS::log("Allowed client '".$allowed_client."' matches, logout request is allowed");
$allowed = true;
break;
} else {
phpCAS::log("Allowed client '".$allowed_client."' does not match");
}
}
if (!$allowed) {
phpCAS::error("Unauthorized logout request from client '".$client."'");
printf("Unauthorized!");
phpCAS::traceExit();
exit();
}
} else {
phpCAS::log("No access control set");
}
// Extract the ticket from the SAML Request
preg_match("|<samlp:SessionIndex>(.*)</samlp:SessionIndex>|", $_POST['logoutRequest'], $tick, PREG_OFFSET_CAPTURE, 3);
$wrappedSamlSessionIndex = preg_replace('|<samlp:SessionIndex>|','',$tick[0][0]);
$ticket2logout = preg_replace('|</samlp:SessionIndex>|','',$wrappedSamlSessionIndex);
phpCAS::log("Ticket to logout: ".$ticket2logout);
$session_id = preg_replace('/[^\w]/','',$ticket2logout);
phpCAS::log("Session id: ".$session_id);
// fix New session ID
session_id($session_id);
$_COOKIE[session_name()]=$session_id;
$_GET[session_name()]=$session_id;
// Overwrite session
session_start();
session_unset();
session_destroy();
printf("Disconnected!");
phpCAS::traceExit();
exit();
}
/** @} */
// XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
// XX XX
// XX BASIC CLIENT FEATURES (CAS 1.0) XX
// XX XX
// XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
// ########################################################################
// ST
// ########################################################################
/**
* @addtogroup internalBasic
* @{
*/
/**
* the Service Ticket provided in the URL of the request if present
* (empty otherwise). Written by CASClient::CASClient(), read by
* CASClient::getST() and CASClient::hasPGT().
*
* @hideinitializer
* @private
*/
var $_st = '';
/**
* This method returns the Service Ticket provided in the URL of the request.
* @return The service ticket.
* @private
*/
function getST()
{ return $this->_st; }
/**
* This method stores the Service Ticket.
* @param $st The Service Ticket.
* @private
*/
function setST($st)
{ $this->_st = $st; }
/**
* This method tells if a Service Ticket was stored.
* @return TRUE if a Service Ticket has been stored.
* @private
*/
function hasST()
{ return !empty($this->_st); }
/** @} */
// ########################################################################
// ST VALIDATION
// ########################################################################
/**
* @addtogroup internalBasic
* @{
*/
/**
* the certificate of the CAS server.
*
* @hideinitializer
* @private
*/
var $_cas_server_cert = '';
/**
* the certificate of the CAS server CA.
*
* @hideinitializer
* @private
*/
var $_cas_server_ca_cert = '';
/**
* Set to true not to validate the CAS server.
*
* @hideinitializer
* @private
*/
var $_no_cas_server_validation = false;
/**
* Set the certificate of the CAS server.
*
* @param $cert the PEM certificate
*/
function setCasServerCert($cert)
{
$this->_cas_server_cert = $cert;
}
/**
* Set the CA certificate of the CAS server.
*
* @param $cert the PEM certificate of the CA that emited the cert of the server
*/
function setCasServerCACert($cert)
{
$this->_cas_server_ca_cert = $cert;
}
/**
* Set no SSL validation for the CAS server.
*/
function setNoCasServerValidation()
{
$this->_no_cas_server_validation = true;
}
/**
* This method is used to validate a ST; halt on failure, and sets $validate_url,
* $text_reponse and $tree_response on success. These parameters are used later
* by CASClient::validatePGT() for CAS proxies.
*
* @param $validate_url the URL of the request to the CAS server.
* @param $text_response the response of the CAS server, as is (XML text).
* @param $tree_response the response of the CAS server, as a DOM XML tree.
*
* @return bool TRUE when successfull, halt otherwise by calling CASClient::authError().
*
* @private
*/
function validateST($validate_url,&$text_response,&$tree_response)
{
phpCAS::traceBegin();
// build the URL to validate the ticket
$validate_url = $this->getServerServiceValidateURL().'&ticket='.$this->getST();
if ( $this->isProxy() ) {
// pass the callback url for CAS proxies
$validate_url .= '&pgtUrl='.$this->getCallbackURL();
}
// open and read the URL
if ( !$this->readURL($validate_url,''/*cookies*/,$headers,$text_response,$err_msg) ) {
phpCAS::trace('could not open URL \''.$validate_url.'\' to validate ('.$err_msg.')');
$this->authError('ST not validated',
$validate_url,
TRUE/*$no_response*/);
}
// analyze the result depending on the version
switch ($this->getServerVersion()) {
case CAS_VERSION_1_0:
if (preg_match('/^no\n/',$text_response)) {
phpCAS::trace('ST has not been validated');
$this->authError('ST not validated',
$validate_url,
FALSE/*$no_response*/,
FALSE/*$bad_response*/,
$text_response);
}
if (!preg_match('/^yes\n/',$text_response)) {
phpCAS::trace('ill-formed response');
$this->authError('ST not validated',
$validate_url,
FALSE/*$no_response*/,
TRUE/*$bad_response*/,
$text_response);
}
// ST has been validated, extract the user name
$arr = preg_split('/\n/',$text_response);
$this->setUser(trim($arr[1]));
break;
case CAS_VERSION_2_0:
// read the response of the CAS server into a DOM object
if ( !($dom = domxml_open_mem($text_response))) {
phpCAS::trace('domxml_open_mem() failed');
$this->authError('ST not validated',
$validate_url,
FALSE/*$no_response*/,
TRUE/*$bad_response*/,
$text_response);
}
// read the root node of the XML tree
if ( !($tree_response = $dom->document_element()) ) {
phpCAS::trace('document_element() failed');
$this->authError('ST not validated',
$validate_url,
FALSE/*$no_response*/,
TRUE/*$bad_response*/,
$text_response);
}
// insure that tag name is 'serviceResponse'
if ( $tree_response->node_name() != 'serviceResponse' ) {
phpCAS::trace('bad XML root node (should be `serviceResponse\' instead of `'.$tree_response->node_name().'\'');
$this->authError('ST not validated',
$validate_url,
FALSE/*$no_response*/,
TRUE/*$bad_response*/,
$text_response);
}
if ( sizeof($success_elements = $tree_response->get_elements_by_tagname("authenticationSuccess")) != 0) {
// authentication succeded, extract the user name
if ( sizeof($user_elements = $success_elements[0]->get_elements_by_tagname("user")) == 0) {
phpCAS::trace('<authenticationSuccess> found, but no <user>');
$this->authError('ST not validated',
$validate_url,
FALSE/*$no_response*/,
TRUE/*$bad_response*/,
$text_response);
}
$user = trim($user_elements[0]->get_content());
phpCAS::trace('user = `'.$user);
$this->setUser($user);
} else if ( sizeof($failure_elements = $tree_response->get_elements_by_tagname("authenticationFailure")) != 0) {
phpCAS::trace('<authenticationFailure> found');
// authentication failed, extract the error code and message
$this->authError('ST not validated',
$validate_url,
FALSE/*$no_response*/,
FALSE/*$bad_response*/,
$text_response,
$failure_elements[0]->get_attribute('code')/*$err_code*/,
trim($failure_elements[0]->get_content())/*$err_msg*/);
} else {
phpCAS::trace('neither <authenticationSuccess> nor <authenticationFailure> found');
$this->authError('ST not validated',
$validate_url,
FALSE/*$no_response*/,
TRUE/*$bad_response*/,
$text_response);
}
break;
}
// at this step, ST has been validated and $this->_user has been set,
phpCAS::traceEnd(TRUE);
return TRUE;
}
/** @} */
// XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
// XX XX
// XX PROXY FEATURES (CAS 2.0) XX
// XX XX
// XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
// ########################################################################
// PROXYING
// ########################################################################
/**
* @addtogroup internalProxy
* @{
*/
/**
* A boolean telling if the client is a CAS proxy or not. Written by CASClient::CASClient(),
* read by CASClient::isProxy().
*
* @private
*/
var $_proxy;
/**
* Tells if a CAS client is a CAS proxy or not
*
* @return TRUE when the CAS client is a CAs proxy, FALSE otherwise
*
* @private
*/
function isProxy()
{
return $this->_proxy;
}
/** @} */
// ########################################################################
// PGT
// ########################################################################
/**
* @addtogroup internalProxy
* @{
*/
/**
* the Proxy Grnting Ticket given by the CAS server (empty otherwise).
* Written by CASClient::setPGT(), read by CASClient::getPGT() and CASClient::hasPGT().
*
* @hideinitializer
* @private
*/
var $_pgt = '';
/**
* This method returns the Proxy Granting Ticket given by the CAS server.
* @return The Proxy Granting Ticket.
* @private
*/
function getPGT()
{ return $this->_pgt; }
/**
* This method stores the Proxy Granting Ticket.
* @param $pgt The Proxy Granting Ticket.
* @private
*/
function setPGT($pgt)
{ $this->_pgt = $pgt; }
/**
* This method tells if a Proxy Granting Ticket was stored.
* @return TRUE if a Proxy Granting Ticket has been stored.
* @private
*/
function hasPGT()
{ return !empty($this->_pgt); }
/** @} */
// ########################################################################
// CALLBACK MODE
// ########################################################################
/**
* @addtogroup internalCallback
* @{
*/
/**
* each PHP script using phpCAS in proxy mode is its own callback to get the
* PGT back from the CAS server. callback_mode is detected by the constructor
* thanks to the GET parameters.
*/
/**
* a boolean to know if the CAS client is running in callback mode. Written by
* CASClient::setCallBackMode(), read by CASClient::isCallbackMode().
*
* @hideinitializer
* @private
*/
var $_callback_mode = FALSE;
/**
* This method sets/unsets callback mode.
*
* @param $callback_mode TRUE to set callback mode, FALSE otherwise.
*
* @private
*/
function setCallbackMode($callback_mode)
{
$this->_callback_mode = $callback_mode;
}
/**
* This method returns TRUE when the CAs client is running i callback mode,
* FALSE otherwise.
*
* @return A boolean.
*
* @private
*/
function isCallbackMode()
{
return $this->_callback_mode;
}
/**
* the URL that should be used for the PGT callback (in fact the URL of the
* current request without any CGI parameter). Written and read by
* CASClient::getCallbackURL().
*
* @hideinitializer
* @private
*/
var $_callback_url = '';
/**
* This method returns the URL that should be used for the PGT callback (in
* fact the URL of the current request without any CGI parameter, except if
* phpCAS::setFixedCallbackURL() was used).
*
* @return The callback URL
*
* @private
*/
function getCallbackURL()
{
// the URL is built when needed only
if ( empty($this->_callback_url) ) {
$final_uri = '';
// remove the ticket if present in the URL
$final_uri = 'https://';
/* replaced by Julien Marchal - v0.4.6
* $this->uri .= $_SERVER['SERVER_NAME'];
*/
if(empty($_SERVER['HTTP_X_FORWARDED_SERVER'])){
/* replaced by teedog - v0.4.12
* $final_uri .= $_SERVER['SERVER_NAME'];
*/
if (empty($_SERVER['SERVER_NAME'])) {
$final_uri .= $_SERVER['HTTP_HOST'];
} else {
$final_uri .= $_SERVER['SERVER_NAME'];
}
} else {
$final_uri .= $_SERVER['HTTP_X_FORWARDED_SERVER'];
}
if ( ($this->isHttps() && $_SERVER['SERVER_PORT']!=443)
|| (!$this->isHttps() && $_SERVER['SERVER_PORT']!=80) ) {
$final_uri .= ':';
$final_uri .= $_SERVER['SERVER_PORT'];
}
$request_uri = $_SERVER['REQUEST_URI'];
$request_uri = preg_replace('/\?.*$/','',$request_uri);
$final_uri .= $request_uri;
$this->setCallbackURL($final_uri);
}
return $this->_callback_url;
}
/**
* This method sets the callback url.
*
* @param $callback_url url to set callback
*
* @private
*/
function setCallbackURL($url)
{
return $this->_callback_url = $url;
}
/**
* This method is called by CASClient::CASClient() when running in callback
* mode. It stores the PGT and its PGT Iou, prints its output and halts.
*
* @private
*/
function callback()
{
phpCAS::traceBegin();
$this->printHTMLHeader('phpCAS callback');
$pgt_iou = $_GET['pgtIou'];
$pgt = $_GET['pgtId'];
phpCAS::trace('Storing PGT `'.$pgt.'\' (id=`'.$pgt_iou.'\')');
echo '<p>Storing PGT `'.$pgt.'\' (id=`'.$pgt_iou.'\').</p>';
$this->storePGT($pgt,$pgt_iou);
$this->printHTMLFooter();
phpCAS::traceExit();
}
/** @} */
// ########################################################################
// PGT STORAGE
// ########################################################################
/**
* @addtogroup internalPGTStorage
* @{
*/
/**
* an instance of a class inheriting of PGTStorage, used to deal with PGT
* storage. Created by CASClient::setPGTStorageFile() or CASClient::setPGTStorageDB(), used
* by CASClient::setPGTStorageFile(), CASClient::setPGTStorageDB() and CASClient::initPGTStorage().
*
* @hideinitializer
* @private
*/
var $_pgt_storage = null;
/**
* This method is used to initialize the storage of PGT's.
* Halts on error.
*
* @private
*/
function initPGTStorage()
{
// if no SetPGTStorageXxx() has been used, default to file
if ( !is_object($this->_pgt_storage) ) {
$this->setPGTStorageFile();
}
// initializes the storage
$this->_pgt_storage->init();
}
/**
* This method stores a PGT. Halts on error.
*
* @param $pgt the PGT to store
* @param $pgt_iou its corresponding Iou
*
* @private
*/
function storePGT($pgt,$pgt_iou)
{
// ensure that storage is initialized
$this->initPGTStorage();
// writes the PGT
$this->_pgt_storage->write($pgt,$pgt_iou);
}
/**
* This method reads a PGT from its Iou and deletes the corresponding storage entry.
*
* @param $pgt_iou the PGT Iou
*
* @return The PGT corresponding to the Iou, FALSE when not found.
*
* @private
*/
function loadPGT($pgt_iou)
{
// ensure that storage is initialized
$this->initPGTStorage();
// read the PGT
return $this->_pgt_storage->read($pgt_iou);
}
/**
* This method is used to tell phpCAS to store the response of the
* CAS server to PGT requests onto the filesystem.
*
* @param $format the format used to store the PGT's (`plain' and `xml' allowed)
* @param $path the path where the PGT's should be stored
*
* @public
*/
function setPGTStorageFile($format='',
$path='')
{
// check that the storage has not already been set
if ( is_object($this->_pgt_storage) ) {
phpCAS::error('PGT storage already defined');
}
// create the storage object
$this->_pgt_storage = &new PGTStorageFile($this,$format,$path);
}
/**
* This method is used to tell phpCAS to store the response of the
* CAS server to PGT requests into a database.
* @note The connection to the database is done only when needed.
* As a consequence, bad parameters are detected only when
* initializing PGT storage.
*
* @param $user the user to access the data with
* @param $password the user's password
* @param $database_type the type of the database hosting the data
* @param $hostname the server hosting the database
* @param $port the port the server is listening on
* @param $database the name of the database
* @param $table the name of the table storing the data
*
* @public
*/
function setPGTStorageDB($user,
$password,
$database_type,
$hostname,
$port,
$database,
$table)
{
// check that the storage has not already been set
if ( is_object($this->_pgt_storage) ) {
phpCAS::error('PGT storage already defined');
}
// warn the user that he should use file storage...
trigger_error('PGT storage into database is an experimental feature, use at your own risk',E_USER_WARNING);
// create the storage object
$this->_pgt_storage = & new PGTStorageDB($this,$user,$password,$database_type,$hostname,$port,$database,$table);
}
// ########################################################################
// PGT VALIDATION
// ########################################################################
/**
* This method is used to validate a PGT; halt on failure.
*
* @param $validate_url the URL of the request to the CAS server.
* @param $text_response the response of the CAS server, as is (XML text); result
* of CASClient::validateST() or CASClient::validatePT().
* @param $tree_response the response of the CAS server, as a DOM XML tree; result
* of CASClient::validateST() or CASClient::validatePT().
*
* @return bool TRUE when successfull, halt otherwise by calling CASClient::authError().
*
* @private
*/
function validatePGT(&$validate_url,$text_response,$tree_response)
{
phpCAS::traceBegin();
if ( sizeof($arr = $tree_response->get_elements_by_tagname("proxyGrantingTicket")) == 0) {
phpCAS::trace('<proxyGrantingTicket> not found');
// authentication succeded, but no PGT Iou was transmitted
$this->authError('Ticket validated but no PGT Iou transmitted',
$validate_url,
FALSE/*$no_response*/,
FALSE/*$bad_response*/,
$text_response);
} else {
// PGT Iou transmitted, extract it
$pgt_iou = trim($arr[0]->get_content());
$pgt = $this->loadPGT($pgt_iou);
if ( $pgt == FALSE ) {
phpCAS::trace('could not load PGT');
$this->authError('PGT Iou was transmitted but PGT could not be retrieved',
$validate_url,
FALSE/*$no_response*/,
FALSE/*$bad_response*/,
$text_response);
}
$this->setPGT($pgt);
}
phpCAS::traceEnd(TRUE);
return TRUE;
}
// ########################################################################
// PGT VALIDATION
// ########################################################################
/**
* This method is used to retrieve PT's from the CAS server thanks to a PGT.
*
* @param $target_service the service to ask for with the PT.
* @param $err_code an error code (PHPCAS_SERVICE_OK on success).
* @param $err_msg an error message (empty on success).
*
* @return a Proxy Ticket, or FALSE on error.
*
* @private
*/
function retrievePT($target_service,&$err_code,&$err_msg)
{
phpCAS::traceBegin();
// by default, $err_msg is set empty and $pt to TRUE. On error, $pt is
// set to false and $err_msg to an error message. At the end, if $pt is FALSE
// and $error_msg is still empty, it is set to 'invalid response' (the most
// commonly encountered error).
$err_msg = '';
// build the URL to retrieve the PT
// $cas_url = $this->getServerProxyURL().'?targetService='.preg_replace('/&/','%26',$target_service).'&pgt='.$this->getPGT();
$cas_url = $this->getServerProxyURL().'?targetService='.urlencode($target_service).'&pgt='.$this->getPGT();
// open and read the URL
if ( !$this->readURL($cas_url,''/*cookies*/,$headers,$cas_response,$err_msg) ) {
phpCAS::trace('could not open URL \''.$cas_url.'\' to validate ('.$err_msg.')');
$err_code = PHPCAS_SERVICE_PT_NO_SERVER_RESPONSE;
$err_msg = 'could not retrieve PT (no response from the CAS server)';
phpCAS::traceEnd(FALSE);
return FALSE;
}
$bad_response = FALSE;
if ( !$bad_response ) {
// read the response of the CAS server into a DOM object
if ( !($dom = @domxml_open_mem($cas_response))) {
phpCAS::trace('domxml_open_mem() failed');
// read failed
$bad_response = TRUE;
}
}
if ( !$bad_response ) {
// read the root node of the XML tree
if ( !($root = $dom->document_element()) ) {
phpCAS::trace('document_element() failed');
// read failed
$bad_response = TRUE;
}
}
if ( !$bad_response ) {
// insure that tag name is 'serviceResponse'
if ( $root->node_name() != 'serviceResponse' ) {
phpCAS::trace('node_name() failed');
// bad root node
$bad_response = TRUE;
}
}
if ( !$bad_response ) {
// look for a proxySuccess tag
if ( sizeof($arr = $root->get_elements_by_tagname("proxySuccess")) != 0) {
// authentication succeded, look for a proxyTicket tag
if ( sizeof($arr = $root->get_elements_by_tagname("proxyTicket")) != 0) {
$err_code = PHPCAS_SERVICE_OK;
$err_msg = '';
phpCAS::trace('original PT: '.trim($arr[0]->get_content()));
$pt = trim($arr[0]->get_content());
phpCAS::traceEnd($pt);
return $pt;
} else {
phpCAS::trace('<proxySuccess> was found, but not <proxyTicket>');
}
}
// look for a proxyFailure tag
else if ( sizeof($arr = $root->get_elements_by_tagname("proxyFailure")) != 0) {
// authentication failed, extract the error
$err_code = PHPCAS_SERVICE_PT_FAILURE;
$err_msg = 'PT retrieving failed (code=`'
.$arr[0]->get_attribute('code')
.'\', message=`'
.trim($arr[0]->get_content())
.'\')';
phpCAS::traceEnd(FALSE);
return FALSE;
} else {
phpCAS::trace('neither <proxySuccess> nor <proxyFailure> found');
}
}
// at this step, we are sure that the response of the CAS server was ill-formed
$err_code = PHPCAS_SERVICE_PT_BAD_SERVER_RESPONSE;
$err_msg = 'Invalid response from the CAS server (response=`'.$cas_response.'\')';
phpCAS::traceEnd(FALSE);
return FALSE;
}
// ########################################################################
// ACCESS TO EXTERNAL SERVICES
// ########################################################################
/**
* This method is used to acces a remote URL.
*
* @param $url the URL to access.
* @param $cookies an array containing cookies strings such as 'name=val'
* @param $headers an array containing the HTTP header lines of the response
* (an empty array on failure).
* @param $body the body of the response, as a string (empty on failure).
* @param $err_msg an error message, filled on failure.
*
* @return TRUE on success, FALSE otherwise (in this later case, $err_msg
* contains an error message).
*
* @private
*/
function readURL($url,$cookies,&$headers,&$body,&$err_msg)
{
phpCAS::traceBegin();
$headers = '';
$body = '';
$err_msg = '';
$res = TRUE;
// initialize the CURL session
$ch = curl_init($url);
if (version_compare(PHP_VERSION,'5.1.3','>=')) {
//only avaible in php5
curl_setopt_array($ch, $this->_curl_options);
} else {
foreach ($this->_curl_options as $key => $value) {
curl_setopt($ch, $key, $value);
}
}
if ($this->_cas_server_cert == '' && $this->_cas_server_ca_cert == '' && !$this->_no_cas_server_validation) {
phpCAS::error('one of the methods phpCAS::setCasServerCert(), phpCAS::setCasServerCACert() or phpCAS::setNoCasServerValidation() must be called.');
}
if ($this->_cas_server_cert != '' ) {
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 1);
curl_setopt($ch, CURLOPT_SSLCERT, $this->_cas_server_cert);
} else if ($this->_cas_server_ca_cert != '') {
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 1);
curl_setopt($ch, CURLOPT_CAINFO, $this->_cas_server_ca_cert);
} else {
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 1);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);
}
// return the CURL output into a variable
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
// get the HTTP header with a callback
$this->_curl_headers = array(); // empty the headers array
curl_setopt($ch, CURLOPT_HEADERFUNCTION, array($this, '_curl_read_headers'));
// add cookies headers
if ( is_array($cookies) ) {
curl_setopt($ch,CURLOPT_COOKIE,implode(';',$cookies));
}
// perform the query
$buf = curl_exec ($ch);
if ( $buf === FALSE ) {
phpCAS::trace('curl_exec() failed');
$err_msg = 'CURL error #'.curl_errno($ch).': '.curl_error($ch);
// close the CURL session
curl_close ($ch);
$res = FALSE;
} else {
// close the CURL session
curl_close ($ch);
$headers = $this->_curl_headers;
$body = $buf;
}
phpCAS::traceEnd($res);
return $res;
}
/**
* This method is the callback used by readURL method to request HTTP headers.
*/
var $_curl_headers = array();
function _curl_read_headers($ch, $header)
{
$this->_curl_headers[] = $header;
return strlen($header);
}
/**
* This method is used to access an HTTP[S] service.
*
* @param $url the service to access.
* @param $err_code an error code Possible values are PHPCAS_SERVICE_OK (on
* success), PHPCAS_SERVICE_PT_NO_SERVER_RESPONSE, PHPCAS_SERVICE_PT_BAD_SERVER_RESPONSE,
* PHPCAS_SERVICE_PT_FAILURE, PHPCAS_SERVICE_NOT AVAILABLE.
* @param $output the output of the service (also used to give an error
* message on failure).
*
* @return TRUE on success, FALSE otherwise (in this later case, $err_code
* gives the reason why it failed and $output contains an error message).
*
* @public
*/
function serviceWeb($url,&$err_code,&$output)
{
phpCAS::traceBegin();
// at first retrieve a PT
$pt = $this->retrievePT($url,$err_code,$output);
$res = TRUE;
// test if PT was retrieved correctly
if ( !$pt ) {
// note: $err_code and $err_msg are filled by CASClient::retrievePT()
phpCAS::trace('PT was not retrieved correctly');
$res = FALSE;
} else {
// add cookies if necessary
if ( is_array($_SESSION['phpCAS']['services'][$url]['cookies']) ) {
foreach ( $_SESSION['phpCAS']['services'][$url]['cookies'] as $name => $val ) {
$cookies[] = $name.'='.$val;
}
}
// build the URL including the PT
if ( strstr($url,'?') === FALSE ) {
$service_url = $url.'?ticket='.$pt;
} else {
$service_url = $url.'&ticket='.$pt;
}
phpCAS::trace('reading URL`'.$service_url.'\'');
if ( !$this->readURL($service_url,$cookies,$headers,$output,$err_msg) ) {
phpCAS::trace('could not read URL`'.$service_url.'\'');
$err_code = PHPCAS_SERVICE_NOT_AVAILABLE;
// give an error message
$output = sprintf($this->getString(CAS_STR_SERVICE_UNAVAILABLE),
$service_url,
$err_msg);
$res = FALSE;
} else {
// URL has been fetched, extract the cookies
phpCAS::trace('URL`'.$service_url.'\' has been read, storing cookies:');
foreach ( $headers as $header ) {
// test if the header is a cookie
if ( preg_match('/^Set-Cookie:/',$header) ) {
// the header is a cookie, remove the beginning
$header_val = preg_replace('/^Set-Cookie: */','',$header);
// extract interesting information
$name_val = strtok($header_val,'; ');
// extract the name and the value of the cookie
$cookie_name = strtok($name_val,'=');
$cookie_val = strtok('=');
// store the cookie
$_SESSION['phpCAS']['services'][$url]['cookies'][$cookie_name] = $cookie_val;
phpCAS::trace($cookie_name.' -> '.$cookie_val);
}
}
}
}
phpCAS::traceEnd($res);
return $res;
}
/**
* This method is used to access an IMAP/POP3/NNTP service.
*
* @param $url a string giving the URL of the service, including the mailing box
* for IMAP URLs, as accepted by imap_open().
* @param $flags options given to imap_open().
* @param $err_code an error code Possible values are PHPCAS_SERVICE_OK (on
* success), PHPCAS_SERVICE_PT_NO_SERVER_RESPONSE, PHPCAS_SERVICE_PT_BAD_SERVER_RESPONSE,
* PHPCAS_SERVICE_PT_FAILURE, PHPCAS_SERVICE_NOT AVAILABLE.
* @param $err_msg an error message on failure
* @param $pt the Proxy Ticket (PT) retrieved from the CAS server to access the URL
* on success, FALSE on error).
*
* @return an IMAP stream on success, FALSE otherwise (in this later case, $err_code
* gives the reason why it failed and $err_msg contains an error message).
*
* @public
*/
function serviceMail($url,$flags,&$err_code,&$err_msg,&$pt)
{
phpCAS::traceBegin();
// at first retrieve a PT
$pt = $this->retrievePT($target_service,$err_code,$output);
$stream = FALSE;
// test if PT was retrieved correctly
if ( !$pt ) {
// note: $err_code and $err_msg are filled by CASClient::retrievePT()
phpCAS::trace('PT was not retrieved correctly');
} else {
phpCAS::trace('opening IMAP URL `'.$url.'\'...');
$stream = @imap_open($url,$this->getUser(),$pt,$flags);
if ( !$stream ) {
phpCAS::trace('could not open URL');
$err_code = PHPCAS_SERVICE_NOT_AVAILABLE;
// give an error message
$err_msg = sprintf($this->getString(CAS_STR_SERVICE_UNAVAILABLE),
$service_url,
var_export(imap_errors(),TRUE));
$pt = FALSE;
$stream = FALSE;
} else {
phpCAS::trace('ok');
}
}
phpCAS::traceEnd($stream);
return $stream;
}
/** @} */
// XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
// XX XX
// XX PROXIED CLIENT FEATURES (CAS 2.0) XX
// XX XX
// XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
// ########################################################################
// PT
// ########################################################################
/**
* @addtogroup internalProxied
* @{
*/
/**
* the Proxy Ticket provided in the URL of the request if present
* (empty otherwise). Written by CASClient::CASClient(), read by
* CASClient::getPT() and CASClient::hasPGT().
*
* @hideinitializer
* @private
*/
var $_pt = '';
/**
* This method returns the Proxy Ticket provided in the URL of the request.
* @return The proxy ticket.
* @private
*/
function getPT()
{
// return 'ST'.substr($this->_pt, 2);
return $this->_pt;
}
/**
* This method stores the Proxy Ticket.
* @param $pt The Proxy Ticket.
* @private
*/
function setPT($pt)
{ $this->_pt = $pt; }
/**
* This method tells if a Proxy Ticket was stored.
* @return TRUE if a Proxy Ticket has been stored.
* @private
*/
function hasPT()
{ return !empty($this->_pt); }
/** @} */
// ########################################################################
// PT VALIDATION
// ########################################################################
/**
* @addtogroup internalProxied
* @{
*/
/**
* This method is used to validate a PT; halt on failure
*
* @return bool TRUE when successfull, halt otherwise by calling CASClient::authError().
*
* @private
*/
function validatePT(&$validate_url,&$text_response,&$tree_response)
{
phpCAS::traceBegin();
// build the URL to validate the ticket
$validate_url = $this->getServerProxyValidateURL().'&ticket='.$this->getPT();
if ( $this->isProxy() ) {
// pass the callback url for CAS proxies
$validate_url .= '&pgtUrl='.$this->getCallbackURL();
}
// open and read the URL
if ( !$this->readURL($validate_url,''/*cookies*/,$headers,$text_response,$err_msg) ) {
phpCAS::trace('could not open URL \''.$validate_url.'\' to validate ('.$err_msg.')');
$this->authError('PT not validated',
$validate_url,
TRUE/*$no_response*/);
}
// read the response of the CAS server into a DOM object
if ( !($dom = domxml_open_mem($text_response))) {
// read failed
$this->authError('PT not validated',
$validate_url,
FALSE/*$no_response*/,
TRUE/*$bad_response*/,
$text_response);
}
// read the root node of the XML tree
if ( !($tree_response = $dom->document_element()) ) {
// read failed
$this->authError('PT not validated',
$validate_url,
FALSE/*$no_response*/,
TRUE/*$bad_response*/,
$text_response);
}
// insure that tag name is 'serviceResponse'
if ( $tree_response->node_name() != 'serviceResponse' ) {
// bad root node
$this->authError('PT not validated',
$validate_url,
FALSE/*$no_response*/,
TRUE/*$bad_response*/,
$text_response);
}
if ( sizeof($arr = $tree_response->get_elements_by_tagname("authenticationSuccess")) != 0) {
// authentication succeded, extract the user name
if ( sizeof($arr = $tree_response->get_elements_by_tagname("user")) == 0) {
// no user specified => error
$this->authError('PT not validated',
$validate_url,
FALSE/*$no_response*/,
TRUE/*$bad_response*/,
$text_response);
}
$this->setUser(trim($arr[0]->get_content()));
} else if ( sizeof($arr = $tree_response->get_elements_by_tagname("authenticationFailure")) != 0) {
// authentication succeded, extract the error code and message
$this->authError('PT not validated',
$validate_url,
FALSE/*$no_response*/,
FALSE/*$bad_response*/,
$text_response,
$arr[0]->get_attribute('code')/*$err_code*/,
trim($arr[0]->get_content())/*$err_msg*/);
} else {
$this->authError('PT not validated',
$validate_url,
FALSE/*$no_response*/,
TRUE/*$bad_response*/,
$text_response);
}
// at this step, PT has been validated and $this->_user has been set,
phpCAS::traceEnd(TRUE);
return TRUE;
}
/** @} */
// XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
// XX XX
// XX MISC XX
// XX XX
// XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
/**
* @addtogroup internalMisc
* @{
*/
// ########################################################################
// URL
// ########################################################################
/**
* the URL of the current request (without any ticket CGI parameter). Written
* and read by CASClient::getURL().
*
* @hideinitializer
* @private
*/
var $_url = '';
/**
* This method returns the URL of the current request (without any ticket
* CGI parameter).
*
* @return The URL
*
* @private
*/
function getURL()
{
phpCAS::traceBegin();
// the URL is built when needed only
if ( empty($this->_url) ) {
$final_uri = '';
// remove the ticket if present in the URL
$final_uri = ($this->isHttps()) ? 'https' : 'http';
$final_uri .= '://';
/* replaced by Julien Marchal - v0.4.6
* $this->_url .= $_SERVER['SERVER_NAME'];
*/
if(empty($_SERVER['HTTP_X_FORWARDED_SERVER'])){
/* replaced by teedog - v0.4.12
* $this->_url .= $_SERVER['SERVER_NAME'];
*/
if (empty($_SERVER['SERVER_NAME'])) {
$server_name = $_SERVER['HTTP_HOST'];
} else {
$server_name = $_SERVER['SERVER_NAME'];
}
} else {
$server_name = $_SERVER['HTTP_X_FORWARDED_SERVER'];
}
$final_uri .= $server_name;
if (!strpos($server_name, ':')) {
if ( ($this->isHttps() && $_SERVER['SERVER_PORT']!=443)
|| (!$this->isHttps() && $_SERVER['SERVER_PORT']!=80) ) {
$final_uri .= ':';
$final_uri .= $_SERVER['SERVER_PORT'];
}
}
$final_uri .= strtok($_SERVER['REQUEST_URI'],"?");
$cgi_params = '?'.strtok("?");
// remove the ticket if present in the CGI parameters
$cgi_params = preg_replace('/&ticket=[^&]*/','',$cgi_params);
$cgi_params = preg_replace('/\?ticket=[^&;]*/','?',$cgi_params);
$cgi_params = preg_replace('/\?%26/','?',$cgi_params);
$cgi_params = preg_replace('/\?&/','?',$cgi_params);
$cgi_params = preg_replace('/\?$/','',$cgi_params);
$final_uri .= $cgi_params;
$this->setURL($final_uri);
}
phpCAS::traceEnd($this->_url);
return $this->_url;
}
/**
* This method sets the URL of the current request
*
* @param $url url to set for service
*
* @private
*/
function setURL($url)
{
$this->_url = $url;
}
// ########################################################################
// AUTHENTICATION ERROR HANDLING
// ########################################################################
/**
* This method is used to print the HTML output when the user was not authenticated.
*
* @param $failure the failure that occured
* @param $cas_url the URL the CAS server was asked for
* @param $no_response the response from the CAS server (other
* parameters are ignored if TRUE)
* @param $bad_response bad response from the CAS server ($err_code
* and $err_msg ignored if TRUE)
* @param $cas_response the response of the CAS server
* @param $err_code the error code given by the CAS server
* @param $err_msg the error message given by the CAS server
*
* @private
*/
function authError($failure,$cas_url,$no_response,$bad_response='',$cas_response='',$err_code='',$err_msg='')
{
phpCAS::traceBegin();
$this->printHTMLHeader($this->getString(CAS_STR_AUTHENTICATION_FAILED));
printf($this->getString(CAS_STR_YOU_WERE_NOT_AUTHENTICATED),$this->getURL(),$_SERVER['SERVER_ADMIN']);
phpCAS::trace('CAS URL: '.$cas_url);
phpCAS::trace('Authentication failure: '.$failure);
if ( $no_response ) {
phpCAS::trace('Reason: no response from the CAS server');
} else {
if ( $bad_response ) {
phpCAS::trace('Reason: bad response from the CAS server');
} else {
switch ($this->getServerVersion()) {
case CAS_VERSION_1_0:
phpCAS::trace('Reason: CAS error');
break;
case CAS_VERSION_2_0:
if ( empty($err_code) )
phpCAS::trace('Reason: no CAS error');
else
phpCAS::trace('Reason: ['.$err_code.'] CAS error: '.$err_msg);
break;
}
}
phpCAS::trace('CAS response: '.$cas_response);
}
$this->printHTMLFooter();
phpCAS::traceExit();
exit();
}
/** @} */
}
?>
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