如果您以前使用过窗体身份验证，您会了解当用户访问受限资源时，他们将被自动重定向到指定的登录页面。
If you've used forms authentication before, you know that when the user visits a restricted resource, they are automatically redirected to a specified login page.
在这种情况下，当用户首次访问门户并请求一个受限制的应用程序或数据源时，CAS将执行身份验证。
In this case, cas will perform the authentication when the user first visits the portal and requests a restricted application or data source.
通过使用可信上下文，可以在使用受限制的、敏感的特权时提供更强的控制，并且使中间层服务器或应用程序可以向数据库服务器确定用户的身份。
Using trusted contexts provides greater control while using restricted, sensitive privileges, and allows middle-tier servers or applications to assert the identity of the user to the database server.
现在，如果用户delta(他不是受限制的组sun的成员)尝试通过su变成用户charlie而且他知道密码，那么身份验证会成功。
Now if user delta, who is not a member of the restricted group sun, attempts to su to user Charlie and knows the password, the authentication will succeed.
就像始终采取的操作一样，您应该使用身份验证来确保只有经过授权的用户能够访问受限制的信息。
As always, you should use authentication to help ensure that only authorized users can access restricted information.
就像始终采取的操作一样，您应该使用身份验证来确保只有经过授权的用户能够访问受限制的信息。
As always, you should use authentication to help ensure that only authorized users can access restricted information.
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