CAS客戶端整合（二） Zabbix
阿新 • • 發佈：2017-11-14
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Zabbix是一個強大的服務器/交換機監控應用，有zabbix-server, zabbix-client, zabbix-web 三部分。zabbix-web管理端是用php寫的。
前文參考：CAS客戶端整合（一） Discuz!
登錄流程
修改代碼前例行先確定登錄流程
原登錄過程
Zabbix的登錄流程跟 Discuz 類似。系統從 cookie/session 中讀取用戶會話id，如果用戶為 guest ，只提供部分頁面訪問。需要訪問受限資源，需要再登錄
CAS登錄過程
Zabbix通過cas登錄也跟Discuz幾乎一樣，不過這次保留了zabbix的cookie判斷
代碼修改
引入cas-php-client
CAS客戶端路徑/local/cas，新建/local/cas/CasClient.php:
phpCAS::client ( CAS_VERSION_2_0, CAS_SERVER_HOST, CAS_SERVER_PORT, CAS_SERVER_PATH ); // no SSL validation for the CAS server phpCAS::setNoCasServerValidation (); phpCAS::handleLogoutRequests(); /** * 關閉url攜帶ticket參數，防止重復認證導致 ticket not recognized * @see [https://www.cnblogs.com/next-door-boy/p/3372522.html] */ phpCAS::$_PHPCAS_CLIENT->setNoClearTicketsFromUrl ();
/include/config.inc.php中導入
// cas client
require_once dirname(__FILE__).‘/../local/cas/CasClient.php‘;
// zabbix 核心
require_once dirname(__FILE__).‘/classes/core/Z.php‘;Zabbix 登錄
Zabbix的用戶登錄驗證統一接口/include/class/user/CWebUser::checkAuthentication.這裏是主要的登錄邏輯。zabbix從cookie中獲取zbxsessionid，然後比對是否有效sessionid。如果是有效用戶我們直接允許。如果是guest用戶或沒有 sessionid 則檢查cas是否已登錄，如果已登錄則初始化用戶信息（代碼在下一步介紹）。
public static function checkAuthentication($sessionId) {
try {
if ($sessionId !== null) {
self::$data = API::User()->checkAuthentication([$sessionId]);
/*
* login as guest
* cas authentication.
*/
if (self::$data[‘alias‘] == ZBX_GUEST_USER && phpCAS::isAuthenticated()) {
$sessionId = login_via_cas(phpCAS::getUser());
self::setSessionCookie($sessionId);
return $sessionId;
}
}
if ($sessionId === null || empty(self::$data)) {
/*
* cas authentication.
*/
if (phpCAS::isAuthenticated()) {
$sessionId = login_via_cas(phpCAS::getUser());
self::setSessionCookie($sessionId);
return $sessionId;
}
self::setDefault();
self::$data = API::User()->login([
‘user‘ => ZBX_GUEST_USER,
‘password‘ => ‘‘,
‘userData‘ => true
]);
if (empty(self::$data)) {
clear_messages(1);
throw new Exception();
}
$sessionId = self::$data[‘sessionid‘];
}
if (self::$data[‘gui_access‘] == GROUP_GUI_ACCESS_DISABLED) {
throw new Exception();
}
self::setSessionCookie($sessionId);
return $sessionId;
}
catch (Exception $e) {
self::setDefault();
return false;
}
}初始化用戶信息
根據用戶名初始化用戶信息，代碼從/include/class/api/services/CUser::login() 方法修改而來
/**
* Login from cas
* init user info.
* @param $name
* @author Carl
*/
function login_via_cas($name) {
$userInfo = DBfetch(DBselect(
‘SELECT u.userid,u.attempt_failed,u.attempt_clock,u.attempt_ip‘.
‘ FROM users u‘.
‘ WHERE u.alias=‘.zbx_dbstr($name)
));
if (!$userInfo) {
//CUser::exception(ZBX_API_ERROR_PARAMETERS, _(‘Login name or password is incorrect.‘));
}
// check if user is blocked
if ($userInfo[‘attempt_failed‘] >= ZBX_LOGIN_ATTEMPTS) {
if ((time() - $userInfo[‘attempt_clock‘]) < ZBX_LOGIN_BLOCK) {
//CUser::exception(ZBX_API_ERROR_PARAMETERS, _s(‘Account is blocked for %s seconds‘, (ZBX_LOGIN_BLOCK - (time() - $userInfo[‘attempt_clock‘]))));
}
DBexecute(‘UPDATE users SET attempt_clock=‘.time().‘ WHERE alias=‘.zbx_dbstr($name));
}
// check system permissions
if (!check_perm2system($userInfo[‘userid‘])) {
//CUser::exception(ZBX_API_ERROR_PARAMETERS, _(‘No permissions for system access.‘));
}
$dbAccess = DBfetch(DBselect(
‘SELECT MAX(g.gui_access) AS gui_access‘.
‘ FROM usrgrp g,users_groups ug‘.
‘ WHERE ug.userid=‘.zbx_dbstr($userInfo[‘userid‘]).
‘ AND g.usrgrpid=ug.usrgrpid‘
));
if (zbx_empty($dbAccess[‘gui_access‘])) {
$guiAccess = GROUP_GUI_ACCESS_SYSTEM;
}
else {
$guiAccess = $dbAccess[‘gui_access‘];
}
// start session
$sessionid = md5(time().$name.rand(0, 10000000));
DBexecute(‘INSERT INTO sessions (sessionid,userid,lastaccess,status)‘.
‘ VALUES (‘.zbx_dbstr($sessionid).‘,‘.zbx_dbstr($userInfo[‘userid‘]).‘,‘.time().‘,‘.ZBX_SESSION_ACTIVE.‘)‘
);
$userid = $userInfo[‘userid‘];
$userData = DBfetch(DBselect(
‘SELECT u.userid,u.alias,u.name,u.surname,u.url,u.autologin,u.autologout,u.lang,u.refresh,u.type,‘.
‘ u.theme,u.attempt_failed,u.attempt_ip,u.attempt_clock,u.rows_per_page‘.
‘ FROM users u‘.
‘ WHERE u.userid=‘.zbx_dbstr($userid)
));
$userData[‘debug_mode‘] = (bool) DBfetch(DBselect(
‘SELECT ug.userid‘.
‘ FROM usrgrp g,users_groups ug‘.
‘ WHERE ug.userid=‘.zbx_dbstr($userid).
‘ AND g.usrgrpid=ug.usrgrpid‘.
‘ AND g.debug_mode=‘.GROUP_DEBUG_MODE_ENABLED
));
$userData[‘userip‘] = (isset($_SERVER[‘HTTP_X_FORWARDED_FOR‘]) && $_SERVER[‘HTTP_X_FORWARDED_FOR‘])
? $_SERVER[‘HTTP_X_FORWARDED_FOR‘]
: $_SERVER[‘REMOTE_ADDR‘];
$userData[‘sessionid‘] = $sessionid;
$userData[‘gui_access‘] = $guiAccess;
if ($userInfo[‘attempt_failed‘]) {
DBexecute(‘UPDATE users SET attempt_failed=0 WHERE userid=‘.zbx_dbstr($userInfo[‘userid‘]));
}
CWebUser::$data = CUser::$userData = $userData;
return $sessionid;
}登出
分析代碼發現zabbix的登出全部轉到 index.php 中處理。修改logout這一段
// VAR TYPE OPTIONAL FLAGS VALIDATION EXCEPTION
$fields = [
‘name‘ => [T_ZBX_STR, O_NO, null, null, ‘isset({enter})‘, _(‘Username‘)],
‘password‘ => [T_ZBX_STR, O_OPT, null, null, ‘isset({enter})‘],
‘sessionid‘ => [T_ZBX_STR, O_OPT, null, null, null],
‘reconnect‘ => [T_ZBX_INT, O_OPT, P_SYS|P_ACT, BETWEEN(0, 65535), null],
‘enter‘ => [T_ZBX_STR, O_OPT, P_SYS, null, null],
‘autologin‘ => [T_ZBX_INT, O_OPT, null, null, null],
‘request‘ => [T_ZBX_STR, O_OPT, null, null, null],
// zabbix 獨特的檢查機制，如果不指定無法從 $_REQUEST 變量獲取獲取請求參數
‘logoutRequest‘ => [T_ZBX_STR, O_OPT, null, null, null],
];
check_fields($fields);
// logout
if (isset($_REQUEST[‘reconnect‘]) || !empty($_REQUEST[‘logoutRequest‘])) {
DBstart();
add_audit_details(AUDIT_ACTION_LOGOUT, AUDIT_RESOURCE_USER, CWebUser::$data[‘userid‘], ‘‘, _(‘Manual Logout‘),
CWebUser::$data[‘userid‘]
);
DBend(true);
CWebUser::logout();
//$ref = empty($_SERVER[‘HTTP_REFERER‘]) ? (‘http://‘.$_SERVER[‘SERVER_NAME‘].substr($_SERVER[‘PHP_SELF‘], 0, strrpos($_SERVER[‘PHP_SELF‘], ‘/‘)+1).‘index.php‘) : $_SERVER[‘HTTP_REFERER‘];
// cas 退出後返回的地址
$ref = ‘http://‘.$_SERVER[‘SERVER_NAME‘].substr($_SERVER[‘PHP_SELF‘], 0, strrpos($_SERVER[‘PHP_SELF‘], ‘/‘)+1).‘index.php‘;
phpCAS::logoutWithRedirectService($ref);
redirect(‘index.php‘);
}小結
代碼看起來很少，但是要仔細查看源碼分析登錄過程，然後在什麽地方做修改還是比較費心思的。
這個流程同步登錄已經沒問題了，但是不能同步登出。
因為zabbix的session是以cookie的形式存儲。而cas-server無法清除客戶端本地的cookie，這裏我們又直接根據cookie驗證用戶，所以跳過了cas的狀態復查。
這麽看來，如果換成cas認證，那麽必須拋棄cookie認證？
CAS客戶端整合（二） Zabbix