Authentication

Collaboration diagram for Authentication:

Functions
	CASClient::setUser ($user)
	This method sets the CAS user's login name. More...
	CASClient::getUser ()
	This method returns the CAS user's login name. More...
	CASClient::setAttributes ($attributes)
	CASClient::getAttributes ()
	CASClient::hasAttributes ()
	CASClient::hasAttribute ($key)
	CASClient::getAttribute ($key)
	CASClient::renewAuthentication ()
	This method is called to renew the authentication of the user If the user is authenticated, renew the connection If not, redirect to CAS. More...
	CASClient::forceAuthentication ()
	This method is called to be sure that the user is authenticated. More...
	CASClient::setCacheTimesForAuthRecheck ($n)
	Set the number of times authentication will be cached before rechecked. More...
	CASClient::checkAuthentication ()
	This method is called to check whether the user is authenticated or not. More...
	CASClient::isAuthenticated ()
	This method is called to check if the user is authenticated (previously or by tickets given in the URL). More...
	CASClient::isSessionAuthenticated ()
	This method tells if the current session is authenticated. More...
	CASClient::wasPreviouslyAuthenticated ()
	This method tells if the user has already been (previously) authenticated by looking into the session variables. More...
	CASClient::redirectToCas ($gateway=false, $renew=false)
	This method is used to redirect the client to the CAS server. More...
	CASClient::logout ($params)
	This method is used to logout from CAS. More...
	CASClient::isLogoutRequest ()
	CASClient::isLogoutRequestAllowed ()
	CASClient::handleLogoutRequests ($check_client=true, $allowed_clients=false)
	This method handles logout requests. More...
	CASClient::redirectToCas ($gateway)
	This method is used to redirect the client to the CAS server. More...

Variables
	CASClient::$_user
	The Authenticated user. More...
	CASClient::$_attributes
	The Authenticated users attributes. More...
	CASClient::$_cache_times_for_auth_recheck
	An integer that gives the number of times authentication will be cached before rechecked. More...

Detailed Description

Function Documentation

checkAuthentication()

CASClient::checkAuthentication

(

)

This method is called to check whether the user is authenticated or not.

Returns

TRUE when the user is authenticated, FALSE otherwise.

Definition at line 924 of file client.php.

References $_SESSION, $res, CASClient\isAuthenticated(), CASClient\redirectToCas(), phpCAS\trace(), phpCAS\traceBegin(), and phpCAS\traceEnd().

                {
                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;
                }

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forceAuthentication()

CASClient::forceAuthentication

(

)

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.

Returns

TRUE when the user is authenticated; otherwise halt.

Definition at line 878 of file client.php.

References $_SESSION, $res, CASClient\isAuthenticated(), CASClient\redirectToCas(), phpCAS\trace(), phpCAS\traceBegin(), and phpCAS\traceEnd().

                {
                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;
                }

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getAttribute()

CASClient::getAttribute

(

$key

)

Definition at line 846 of file client.php.

References CASClient\hasAttribute().

                                        {
                if($this->hasAttribute($key)) {
                        return $this->_attributes[$key];
                }
        }

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getAttributes()

CASClient::getAttributes

(

)

Definition at line 833 of file client.php.

References CASClient\$_attributes, and phpCAS\error().

Referenced by CASClient\isAuthenticated().

                                 {
                if ( empty($this->_user) ) { // if no user is set, there shouldn't be any attributes also...
                        phpCAS::error('this method should be used only after '.__CLASS__.'::forceAuthentication() or '.__CLASS__.'::isAuthenticated()');
                }
                return $this->_attributes;
        }

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getUser()

CASClient::getUser

(

)

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.

Returns

the login name of the authenticated user

Definition at line 805 of file client.php.

References CASClient\$_user, and phpCAS\error().

Referenced by CASClient\isAuthenticated().

                {
                if ( empty($this->_user) ) {
                        phpCAS::error('this method should be used only after '.__CLASS__.'::forceAuthentication() or '.__CLASS__.'::isAuthenticated()');
                }
                return $this->_user;
                }

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handleLogoutRequests()

CASClient::handleLogoutRequests	(		$check_client = true,
			$allowed_clients = false
	)

This method handles logout requests.

Parameters

$check_client	true to check the client bofore handling the request, false not to perform any access control. True by default.
$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.

Definition at line 1202 of file client.php.

References $_COOKIE, $_GET, $_POST, $_SERVER, $client, phpCAS\error(), exit, CASClient\getServerHostname(), CASClient\isLogoutRequest(), phpCAS\log(), phpCAS\traceBegin(), phpCAS\traceEnd(), and phpCAS\traceExit().

                                                                                  {
                phpCAS::traceBegin();
                if (!$this->isLogoutRequest()) {
                        phpCAS::log("Not a logout request");
                        phpCAS::traceEnd();
                        return;
                }
                if(!$this->_start_session){
                        phpCAS::log("phpCAS can't handle logout requests if it does not manage the session.");
                }
                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: ".$client."/".$client_ip); 
                        $allowed = false;
                        foreach ($allowed_clients as $allowed_client) {
                                if (($client == $allowed_client) or ($client_ip == $allowed_client)) { 
                                        phpCAS::log("Allowed client '".$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);
                
                // destroy a possible application session created before phpcas
                if(session_id()){
                        session_unset();
                        session_destroy();
                }
                // fix 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();
        }

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hasAttribute()

CASClient::hasAttribute

(

$key

)

Definition at line 843 of file client.php.

Referenced by CASClient\getAttribute().

                { return (is_array($this->_attributes) && array_key_exists($key, $this->_attributes)); }

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hasAttributes()

CASClient::hasAttributes

(

)

Definition at line 840 of file client.php.

                { return !empty($this->_attributes); }

isAuthenticated()

CASClient::isAuthenticated

(

)

This method is called to check if the user is authenticated (previously or by tickets given in the URL).

Returns

TRUE when the user is authenticated. Also may redirect to the same URL without the ticket.

Definition at line 981 of file client.php.

References $_SESSION, $res, CASClient\getAttributes(), CASClient\getPGT(), CASClient\getPT(), CASClient\getSA(), CASClient\getST(), CASClient\getURL(), CASClient\getUser(), CASClient\hasPT(), CASClient\hasSA(), CASClient\hasST(), CASClient\isProxy(), phpCAS\log(), phpCAS\trace(), phpCAS\traceBegin(), phpCAS\traceEnd(), CASClient\validatePGT(), CASClient\validatePT(), and CASClient\wasPreviouslyAuthenticated().

Referenced by CASClient\checkAuthentication(), CASClient\forceAuthentication(), and CASClient\renewAuthentication().

                {
                phpCAS::traceBegin();
                $res = FALSE;
                $validate_url = '';
                
                if ( $this->wasPreviouslyAuthenticated() ) {
                        if($this->hasST() || $this->hasPT() || $this->hasSA()){
                                // User has a additional ticket but was already authenticated
                                phpCAS::trace('ticket was present and will be discarded, use renewAuthenticate()');
                                header('Location: '.$this->getURL());
                                phpCAS::log( "Prepare redirect to remove ticket: ".$this->getURL() );
                        }else{
                                // 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;
                }
                else {
                        if ( $this->hasST() ) {
                                // if a Service Ticket was given, validate it
                                phpCAS::trace('ST `'.$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;
                        }
                        elseif ( $this->hasSA() ) {
                                // if we have a SAML ticket, validate it.
                                phpCAS::trace('SA `'.$this->getSA().'\' is present');
                                $this->validateSA($validate_url,$text_response,$tree_response); // if it fails, it halts
                                phpCAS::trace('SA `'.$this->getSA().'\' was validated');
                                $_SESSION['phpCAS']['user'] = $this->getUser();
                                $_SESSION['phpCAS']['attributes'] = $this->getAttributes();
                                $res = TRUE;
                        }
                        else {
                                // no ticket given, not authenticated
                                phpCAS::trace('no ticket found');
                        }
                        if ($res) {
                                // if called with a ticket parameter, we need to redirect to the app without the ticket so that CAS-ification is transparent to the browser (for later POSTS)
                                // most of the checks and errors should have been made now, so we're safe for redirect without masking error messages.
                                header('Location: '.$this->getURL());
                                phpCAS::log( "Prepare redirect to : ".$this->getURL() );
                        }
                }
                
                phpCAS::traceEnd($res);
                return $res;
                }

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isLogoutRequest()

CASClient::isLogoutRequest ( )

private

Returns

true if the current request is a logout request.

Definition at line 1183 of file client.php.

References $_POST.

Referenced by CASClient\CASClient(), and CASClient\handleLogoutRequests().

                                   {
                return !empty($_POST['logoutRequest']);
        }

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isLogoutRequestAllowed()

CASClient::isLogoutRequestAllowed ( )

private

Returns

true if a logout request is allowed.

Definition at line 1191 of file client.php.

                                          {
        }

isSessionAuthenticated()

CASClient::isSessionAuthenticated

(

)

This method tells if the current session is authenticated.

Returns

true if authenticated based soley on $_SESSION variable

Since

0.4.22 by Brendan Arnold

Definition at line 1057 of file client.php.

References $_SESSION.

Referenced by CASClient\wasPreviouslyAuthenticated().

                {
                return !empty($_SESSION['phpCAS']['user']);
                }

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logout()

CASClient::logout

(

$params

)

This method is used to logout from CAS.

$params an array that contains the optional url and service parameters that will be passed to the CAS server

Definition at line 1154 of file client.php.

References $params, CAS_STR_LOGOUT, CAS_STR_SHOULD_HAVE_BEEN_REDIRECTED, exit, CASClient\getServerLogoutURL(), CASClient\getString(), phpCAS\log(), CASClient\printHTMLFooter(), CASClient\printHTMLHeader(), phpCAS\traceBegin(), and phpCAS\traceExit().

                                 {
                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: '.$cas_url);
                phpCAS::log( "Prepare redirect to : ".$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();
        }

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redirectToCas() [1/2]

CASClient::redirectToCas

(

$gateway

)

This method is used to redirect the client to the CAS server.

It is used by CASClient::forceAuthentication() and CASClient::checkAuthentication().

Parameters

$gateway

true to check authentication, false to force it

Definition at line 743 of file client.php.

References CAS_STR_AUTHENTICATION_WANTED, CAS_STR_SHOULD_HAVE_BEEN_REDIRECTED, exit, CASClient\getServerLoginURL(), CASClient\getString(), CASClient\printHTMLFooter(), CASClient\printHTMLHeader(), phpCAS\traceBegin(), and phpCAS\traceExit().

    {
      phpCAS::traceBegin();
      $cas_url = $this->getServerLoginURL($gateway);
      header('Location: '.$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();
    }

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redirectToCas() [2/2]

CASClient::redirectToCas	(		$gateway = false,
			$renew = false
	)

This method is used to redirect the client to the CAS server.

It is used by CASClient::forceAuthentication() and CASClient::checkAuthentication().

Parameters

$gateway	true to check authentication, false to force it
$renew	true to force the authentication with the CAS server

Definition at line 1133 of file client.php.

References CAS_STR_AUTHENTICATION_WANTED, CAS_STR_SHOULD_HAVE_BEEN_REDIRECTED, exit, CASClient\getServerLoginURL(), CASClient\getString(), phpCAS\log(), CASClient\printHTMLFooter(), CASClient\printHTMLHeader(), phpCAS\traceBegin(), and phpCAS\traceExit().

Referenced by CASClient\checkAuthentication(), CASClient\forceAuthentication(), and CASClient\renewAuthentication().

                                                           {
                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();
        }

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renewAuthentication()

CASClient::renewAuthentication

(

)

This method is called to renew the authentication of the user If the user is authenticated, renew the connection If not, redirect to CAS.

Definition at line 858 of file client.php.

References $_SESSION, CASClient\isAuthenticated(), CASClient\redirectToCas(), phpCAS\trace(), phpCAS\traceBegin(), and phpCAS\traceEnd().

                                      {
                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();
        }

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setAttributes()

CASClient::setAttributes

(

$attributes

)

Definition at line 830 of file client.php.

Referenced by CASClient\wasPreviouslyAuthenticated().

                { $this->_attributes = $attributes; }

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setCacheTimesForAuthRecheck()

CASClient::setCacheTimesForAuthRecheck

(

$n

)

Set the number of times authentication will be cached before rechecked.

Parameters

$n	an integer.

Definition at line 914 of file client.php.

References $n.

                {
                $this->_cache_times_for_auth_recheck = $n;
                }

setUser()

CASClient::setUser (   $user )

private

This method sets the CAS user's login name.

Parameters

$user

the login name of the authenticated user.

Definition at line 793 of file client.php.

Referenced by CASClient\validateSA(), CASClient\validateST(), and CASClient\wasPreviouslyAuthenticated().

                {
                $this->_user = $user;
                }

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wasPreviouslyAuthenticated()

CASClient::wasPreviouslyAuthenticated ( )

private

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.

Returns

TRUE when the user has already been authenticated; FALSE otherwise.

Definition at line 1072 of file client.php.

References $_SESSION, $auth, CASClient\callback(), CASClient\isCallbackMode(), CASClient\isProxy(), CASClient\isSessionAuthenticated(), CASClient\setAttributes(), CASClient\setPGT(), CASClient\setPT(), CASClient\setST(), CASClient\setUser(), phpCAS\trace(), phpCAS\traceBegin(), and phpCAS\traceEnd().

Referenced by CASClient\isAuthenticated().

                {
                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']);
                                if(isset($_SESSION['phpCAS']['attributes'])){
                                        $this->setAttributes($_SESSION['phpCAS']['attributes']);
                                }
                                phpCAS::trace('user = `'.$_SESSION['phpCAS']['user'].'\''); 
                                $auth = TRUE;
                        } else {
                                phpCAS::trace('no user found');
                        }
                }
                
                phpCAS::traceEnd($auth);
                return $auth;
                }

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Variable Documentation

$_attributes

CASClient::$_attributes

private

The Authenticated users attributes.

Written by CASClient::setAttributes(), read by CASClient::getAttributes().

Attention

client applications should use phpCAS::getAttributes().

Definition at line 828 of file client.php.

Referenced by CASClient\getAttributes().

$_cache_times_for_auth_recheck

CASClient::$_cache_times_for_auth_recheck

private

An integer that gives the number of times authentication will be cached before rechecked.

Definition at line 905 of file client.php.

$_user

CASClient::$_user

private

The Authenticated user.

Written by CASClient::setUser(), read by CASClient::getUser().

Attention

client applications should use phpCAS::getUser().

Definition at line 784 of file client.php.

Referenced by CASClient\CASClient(), and CASClient\getUser().