CODEWITHSUNDEEP
asp.netwindows-authenticationlogout
Robert
Robert

Reputation: 15726

ASP.NET Windows Authentication logout

How do you logout when using Windows authentication in ASP.NET like this web.config?

<authentication mode="Windows" />

I've already tried the following unsuccessfully. It redirects, but does not log out the user.

void logoutButton_Click(object sender, EventArgs e) {
    HttpContext.Current.Session.Clear();
    HttpContext.Current.Session.Abandon();
    ViewState.Clear();
    FormsAuthentication.SignOut();
    Response.Redirect("/");
}

Background Info:

I have to use Windows authentication because I need to impersonate the identity using Active Directory to gain access to local files. And I cannot impersonate using Forms authentication because the HttpContext.Current.User.Identity won't be a WindowsIdentity. Impersonate using Forms Authentication

Upvotes: 57

Views: 99109

Answers (9)

Anurag
Anurag

Reputation: 368

You cannot log out programically if Windows Auth is enabled, I ended up with having a logout link on my webpage which upon click will present the message "You are logged out, but to completely log out you need to close the browser".

Another change was in my Domain Controller => Group Policy => User Config => Internet Settings => Local Intranet => Custom Level => Security => USer Authentication => "Prompt for user name and Password" option.

The user is now presented with a Windows Auth dialog box every time a new browser window is opened, hence login is triggered.

Upvotes: 0

Konstantin Sch
Konstantin Sch

Reputation: 89

I think you should use forms auth, but you can use ldap windows user account in forms like this:

using(PrincipalContext pc = new PrincipalContext(ContextType.Domain, "YOURDOMAIN"))
{
    // validate the credentials
    bool isValid = pc.ValidateCredentials("myuser", "mypassword");
}

Upvotes: -2

Scott Vander Molen
Scott Vander Molen

Reputation: 6439

I have this working using JavaScript in both IE and Firefox, though it logs you out of everything you're logged into in IE. It sort of works in Safari, but Safari throws up a phishing warning. Doesn't work in Opera.

try {
    if (document.all) {
        document.execCommand("ClearAuthenticationCache");
        window.location = "/";
    } else {
        window.location = "http://logout:[email protected]";
    }
} catch (e) {
    alert("It was not possible to clear your credentials from browser cache. Please, close your browser window to ensure that you are completely logout of system.");
    self.close();
}

Upvotes: 3

Trent Stewart
Trent Stewart

Reputation: 881

Had alot of trouble with this, below is the code that works, hopefully someone finds it useful.

foreach (var cookie in Request.Cookies.Keys)
{
    Response.Cookies.Delete(cookie);
}


await HttpContext.SignOutAsync(CookieAuthenticationDefaults.AuthenticationScheme);


Response.Cookies.Append("EdgeAccessCookie", "", new Microsoft.AspNetCore.Http.CookieOptions()
{
    Path = "/",
    HttpOnly = true,
    SameSite = SameSiteMode.Lax, Expires = DateTime.Now.AddDays(-1)
});


Response.Redirect("https://adfs.[sitename].com/adfs/ls?wa=wsignout1.0");

Upvotes: 0

Eric
Eric

Reputation: 760

I had a SharePoint application with Windows authentication, I needed automatic logout after 15 minutes. I mixed up some codes and here is the result. it works in IE properly.

<script type="text/javascript">
var t;
window.onload = resetTimer;
document.onmousemove = resetTimer;
document.onkeypress = resetTimer;

function logout() {

    try {
        document.execCommand("ClearAuthenticationCache");
        window.location.href = window.location.protocol.replace(/\:/g, '') + "://" + window.location.host + "/_layouts/customlogin14.aspx";
    }
    catch (e) { }

}

function resetTimer() {
    window.clearTimeout(t);
    t = window.setTimeout(logout, 900000);
}

put these codes in your master page, after 15 mins idle time you will see the login page. hope this help somebody

Upvotes: 6

AnthonyVO
AnthonyVO

Reputation: 3973

The best answers I have seen are found in related StackOverFlow questions:

Is there a browser equivalent to IE's ClearAuthenticationCache?

and

Logging a user out when using HTTP Basic authentication

Basically you need to send a AJAX request to the server with invalid credentials and have the server accept them.

Upvotes: 1

Robert
Robert

Reputation: 15726

No server-side logout button will work when using "Windows" authentication. You must use "Forms" authentication if you want a logout button, or close the user's browser.

Upvotes: 42

Garry English
Garry English

Reputation: 5200

For IE browsers only, you can use the following javascript to logout the user if using Windows Authentication. (Note: closing the browser isn't required, but recommended since the user might be using a non-IE browser).

If the user clicks "No" to close the browser, then the user will be prompted for a username/password if they attempt to access a page on the site that requires authentication.

try {
   document.execCommand("ClearAuthenticationCache");
}
catch (e) { }
window.close();

This code was taken from SharePoint's Signout.aspx page.

Upvotes: 25

tribus
tribus

Reputation: 1110

Windows authentication works at the IIS level by passing your Windows authentication token. Since authentication occurs at the IIS level you cannot actually log out from application code. However, there seems to be an answer to your problem here. It is the second question addressed and essentially involves using Forms Authentication and the LogonUser Windows api.

Upvotes: 15

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