PHPBB结合CAS在linux下配置时候出现有关问题，

PHPBB结合CAS在linux下配置时候出现问题，急急急。。
在linux下结合CAS时候出现问题，安装好mysql php apache tomcat ssl环境之后
按照在PHPBB中加入CASClient 的代码配置了下
in function.php

PHP code

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Add require($phpbb_root_path . 'includes/CAS.' . $phpEx);
Find (isset($_POST['login']))
Replace it with:
if(!$admin && CAS_ENABLE){ 
// initialize phpCAS 
phpCAS::client(CAS_VERSION_2_0, CAS_SERVER_HOSTNAME, CAS_SERVER_PORT, CAS_SERVER_APP_NAME); 
phpCAS::setNoCasServerValidation(); 
// force CAS authentication 
phpCAS::forceAuthentication(); 
} 
if (isset($_POST['login']) || (!$admin && CAS_ENABLE) )
Find $result = $auth->login($username, $password, $autologin, $viewonline, $admin);
Add the following code before it:
if(!$admin && CAS_ENABLE){ 
$username = phpCAS::getUser(); 
$password = ''; 
}

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PHP code

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Add the following function:
function login_cas($username){ 
global $db; 
$sql = 'SELECT user_id, username, user_password, user_passchg, user_pass_convert, user_email, user_type, user_login_attempts FROM ' . USERS_TABLE 
. " WHERE username_clean = '" . $username . "'"; 
$result = $db->sql_query($sql); 
$row = $db->sql_fetchrow($result); 
$db->sql_freeresult($result); 

if (!$row) { 
return array( 
'status' => LOGIN_ERROR_USERNAME, 
'error_msg' => 'LOGIN_ERROR_USERNAME', 
'user_row' => array('user_id' => ANONYMOUS), 
); 
} 

if ($row['user_type'] == USER_INACTIVE || $row['user_type'] == USER_IGNORE) { 
return array( 
'status' => LOGIN_ERROR_ACTIVE, 
'error_msg' => 'ACTIVE_ERROR', 
'user_row' => $row, 
); 
} 

// Successful login... set user_login_attempts to zero... 
return array( 
'status' => LOGIN_SUCCESS, 
'error_msg' => false, 
'user_row' => $row, 
); 
}
Find $login = $method($username, $password);
Replace it with:
if(!$admin && CAS_ENABLE)    
$login = $this->login_cas($username);    
else    
$login = $method($username, $password);

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PHP code

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Add the following constant value:
define('CAS_ENABLE', true); 
define('CAS_SERVER_HOSTNAME', 'localhost'); 
define('CAS_SERVER_PORT', 8443); 
define('CAS_SERVER_APP_NAME', 'cas');

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PHP code

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[phpBB Debug] PHP Notice: in file /includes/CAS/client.php on line 529: session_destroy() [function.session-destroy]: Trying to destroy uninitialized session
CAS Authentication failed!

You were not authenticated.

You may submit your request again by clicking here.

If the problem persists, you may contact the administrator of this site.
phpCAS ${phpcas.version} using server https://localhost:8443/cas/ (CAS 2.0)

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