Check From JavaScript If Loaded Page Has Authentication Cookie?

Mar 30, 2010

It looks like JavaScript does not have access to authentication cookies ('ASP.NET_SessionId', '.ASPXFORMSAUTH') in the http headers I can see cookies but document.cookie object does not have them.

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My requirements is when one other website call my service (httphandler) and in response i will provide one parameter which is

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Check Forms Authentication Status Using Only JavaScript?

Jul 20, 2010

The reason i need to do this is because of Facebook Connect - which is another story, so i'll save you the drama for that. =) Anyway, i have this function that runs on window.onload:

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So, i need help in getting the flag "loggedInUsingFormsAuth". I dont care what is in the cookie, just need to know if the current user is authenticated. Why am i doing this? Well, on window load, if the user is logged into Facebook but not on my website (according to the Forms Authentication cookie), i want to reload the page - which allows my ASP.NET website to read the Facebook cookies in the HttpContext and log the user in. I need to do this in JavaScript, because i dont have the Facebook cookies until i call "SomeFunctionWhichGetsFacebookCookies" - which can only be done in JavaScript.

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I have web page that will call the macromedia detection tool kit. But I cannot get the hasReqestedVersion value before the page is loaded. I tried to use RegisterClientScriptBlock or RegisterStartupScript inside of the Page_load function.

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Aug 19, 2010

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Once authenticated, we redirect their browser to an external, SSL secured page on another web site / domain altogether that we do not control.

The client is redirected back to a pre-configured url on our original http web app when done.

However, the customer is then asked to "re-login" again on our side which is undesired...

It seems the forms authentication cookie is destroyed when transitioning between HTTP and HTTPS and back again.

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May 18, 2010

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Jun 7, 2010

I am having a hard time implementing "Remember Me" functionality in an MVC application with a custom principal. I have boiled it down to ASP.NET not retrieving the authentication cookie for me. I have included a snaphot below from Google Chrome.

Shows the results of Request.Cookies that is set within the controller action and placed in ViewData for the view to read. Notice that it is missing the .ASPXAUTH cookie Shows the results from the Chrome developer tools. You can see that .ASPXAUTH is included here.

Does anyone know what the issue may be here? Why does ASP.NET not read this value from the cookie collection?

My application uses a custom IPrincipal. BusinessPrincipalBase is a CSLA object that ust implements IPrincipal. Here is the code for that:


I do not think that any of this is related because the bottom line is that the Request.Cookies does not return the authentication cookie. Is it related to the size of the cookie? I heard there are issues to the size of the cookie.

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Security - How To Create An Authentication Cookie

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Do we know the algorithm that uses to create the authentication cookie (when using forms authentication?)

Can we basically create our own copy implementation? if so, how?

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Authentication Cookie Timout And IIS 7 Setting?

Jun 11, 2010

I have an ASP.NET website for which i've set the authetication timeout to 60 days so that my users don't have to log in each time they come back if they checked the "remember me" option. Basic ASP.NET login mechanism... It's working fine on my developpement server as well as on the visual studio built-in web server. I can close the browser, wait around 30-40 minutes and browse back to the site and be automatically logged in.

However, I've not moved the site to a hosting provider and it seems that whatever I do to my Web.config file, the cookie expires after around 30 minutes (hard to tell the exact amount of time). I have asked the provider's help support and they basically told me: "Web.config file is to configure your website. Please do not change it if you don't know what you are doing"Frustrating answer indeed... be sure, I checked everywhere on the net for exceptions, fine prints, in the basic authentication but found none.I have access to IIS remote management for my site (IIS 7) but don't really know where to look. Can there be something in the IIS setting that is overriding my web.config authentication setting?

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C# - How To Customize The Forms Authentication Cookie Name

Sep 2, 2010

I have 2 websites running on localhost in different ports. As browsers do not differentiate port numbers when sending cookies, my forms authentication ticket from one site is being sent to the other

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MVC :: Check If JavaScript Exists On The Page?

Nov 5, 2010

I created a mvc helper that add some textbox with javascript.

I want to check if JavaScript file already exists on the page and if not I need to add it to the end of the page.

How can I do it in MVC 2?

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Security :: Share Authentication Cookie Between V3.5 And V4.0 Applications

Nov 6, 2010

I have a bunch of applications that currently share the authentication cookie in v3.5.

We're in the process of upgrading to 4.0 and also upgrading the applications as a whole. I have 1 done, and would love to deploy it. However, as soon as I do, I lose my sharing of authentication cookie in that application.

In each web.config, my machine key is declared. I removed the actual keys to protect the innocent. :)

<machineKey validationKey="..." decryptionKey="..." validation="SHA1"/>
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ASPXAUTH Authentication Cookie Not Cleared On Sign/log Out

Dec 8, 2010

I'm using ASP authentication and the integrated webservice.

The user logins in with Forms authentication on a login page.

To log out, I call the authentication webservice from Silverlight and call logout.

Everything worked OK but now sometimes IE gets crazy and doesn't log out the user anymore.

I used Fiddler and it turns out that the authentication service returns a SetCookie to clear the ASPXAUTH cookie but on the next call IE still has the cookie set.

So off course because the cookie is there the user is authenticated and logs right back in rather than being directed to the login page.

I checked and didn't see any other description of the issue.

I can't reproduce it and my colleagues that have a misbehaving IE have it working fine on one environment and not on the other (one has the issue for DEV and another has the issue for the PreProd server).

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Security :: Authentication Cookie Expires Too Early?

Jul 6, 2010

My users need to stay logged in for 1 day, so I used a persistent authentication cookie with an expiration of 1 day but it still times out after 20 minutes (which is the default timeout for the session, not the cookie).

This is my code:

<authentication mode="Forms">
<forms loginUrl="Login.aspx" protection="All" path="/" />
FormsAuthenticationTicket ticket =
new FormsAuthenticationTicket(1, "username", DateTime.Now, DateTime.Now.AddDays(1), true, "userdata");
string encTicket = FormsAuthentication.Encrypt(ticket);
HttpCookie cookie = new HttpCookie(FormsAuthentication.FormsCookieName, encTicket);
cookie.Expires = ticket.Expiration;

I also have manually-generated validation and decryption keys:


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Security :: Forms Authentication Is Not Updating The Cookie?

Dec 13, 2010

We have had a bug recently where users are logging into an application with multiple browser tabs. They are editing a content page which means that they can be working on a page for sometime (ie with no postbacks) They finally click save and because the session has timed out it takes then to login page. I initally resolved they by adding a reminder that the session is about to expire which initally resolved the issue. It has been noted that even when they are within session time out they still got redirected to login page (and loosing the data on the form). We had real problems replicating the issue but have finally managed to do so now and I have learnt some curous features of .net Forms Authentication.

I have set up a test project which has the membership controls on etc. I have set the Timeout on the <forms> tag

<forms loginUrl="~/Account/Login.aspx" timeout="2" />Case 1I then open two browsers windows (side by side), both on the login page (and logged out)On the left window I login (and start a timer)after 40 seconds on the right window I navigate to a page (which takes me to the page as I have logged in on left window )I then wait until the full 2 minutes has elapsed (but before 2 Minutes and 40 seconds) and then try and navigate to a page on the left window.It redirects me to the login pageI would expect it to allow me to navigate to as I have kept my session open on the right window.Case 2I then open two browsers windows (side by side), both on the login page (and logged out)On the left window I login (and start a timer)after 90 seconds on the right window I navigate to a page (which takes me to the page as I have logged in on left window )I then wait until the full 2 minutes has elapsed (but before 2 Minutes and 40 seconds) and then try and navigate to a page on the left window.It Navigates to the page keeping me logged in.After a bit of reading around the subject I have found out that the slidingexpiration property only renews the cookie if it is in the last 50% of the timeout value:
Sliding expiration resets the expiration time for a valid authentication cookie if a request is made and more than half of the timeout interval has elapsed[URL]

My Question is: How can I override this bit of functionality?

Is there a property to set somewhere to "Always renew cookie"?

Is there another workaround. Unfortunately I can't increase the timeout because of a complience issue (it must be set to 15 minutes)

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AJAX :: PageMethods - Forms Authentication Cookie Not Always Sent?

Oct 26, 2010

Since last week I've had a really odd issue with PageMethods, the forms authentication cookie, and the back button which i've never seen before.

Essentially, I have a 'home page' which on document.ready (using jQuery), loads some data through PageMethods, and then renders a list - from which you can click through to a details page about the item. In general use, it works fine. However, using the back button after clicking through (ie: going back to the home page), it throws a PageMethods error. The browser's 'authentication required' prompt appears, and if you click cancel, the server returns a 401. The error returned by PageMethods on the client side is 'authentication failed'.

After inspecting the request in Fiddler, the forms authentication cookie isn't sent with the request, which would explain why it is happening. My fiddler entry for the request looks like this:


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Forms Authentication - What Is The Content Of FormsAuthentication Cookie Value

May 21, 2010

What is the content of ASP.NET FormsAuthentication cookie value? How can I see the real value of the hashed string (in case that I have the decrypted key)?

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ASPX Authentication Cookie In Virtual Directory

Nov 2, 2010

I have 3 applications running at my end.


I have a login page in three of these applications. When I login in either of these applications the .ASPXAUTH cookie is set but I am seeing that all of the three applications are updating the same .ASPXAUTH cookie instead of creating individual one. For example a user login on "RootSite", .ASPXAUTH cookie is created, now the user comes and login in the application "RootSite/VirtualDirectory1" and this time I am seeing the same .ASPXAUTH cookie is updating. I am confirming this because the created date of this cookie has been changed. So this means instead of creating a new cookie it is using the same cookie. How can I resolve this ? I don't want to interfere the logged-in logged-out status of one application with the other?

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Increase Life Time For Authentication Cookie?

Mar 5, 2011

I used this following code to set authenticate cookie :

System.Web.Security.FormsAuthentication.SetAuthCookie(Profile.Email, true);

my question is how I can increase life-time for this authentication cookie ?

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Security :: Retrieve UserName From Authentication Cookie

Feb 5, 2010

Once the user has authenticated, I would like to base all of the information displayed to the user based on their username. Isn't that saved in the cookie?

For instance, I would like to pull all of their client information using a GridView and have the parameter set to the appropriate authentication information.

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Javascript - How To Check Whether A Certain Text Box Exists In A Page

Feb 9, 2010

Suppose I have a master page where I have written some javascript to access the value of a particular text box, which resides in one of its content pages, but not in all the pages. This piece of javascript code can't be moved to that particular content page because of some restrictions.

Now I need a way to determine whether or not that text box exists in the page, which will imply that the content page containing that text box has been loaded.

How I can I do that in javascript?

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Check If A Webpage Is Loaded Or Not In The Browser Window When Redirecting From A Different Website?

Feb 14, 2011

My requirement is that I have a few hyperlinks on a webpage and when the user clicks on these hyperlinks I should redirect the user to an web page(Default.aspx) in a different website.

For the 1st time when the user clicks on one of the hyperlinks it will launch a new browser window with the Default.aspx loaded and then if the user clicks on some other hyperlink I want to redirect the user to the existing browser window(in which deafult.aspx is already loaded)with the content related to this particular hyperlink loaded,instead of launching a new browser window/tab.

But I am not sure of how to achieve this.I wonder if I can add some js to the Default.aspx page to achieve this.

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WCF / ASMX :: Read Authentication Cookie In Other Technologies Like JAVA?

Jan 12, 2011

I am having a scenario, where i need to decode ASP.NET FormsAuthentication Cookie in other language to accomplish Single Sign-On.

I am having a ASP.NET website, that also has WCF Authentication service. But I have just come know that even Java and PHP Application are also going to use my Authentication Gateway to authenticate user and so enable Single Sing-On.

I am done with the same in .NET application but to perform same in non-.NET techs, I need to decode FormsAuthentication Cookie of browser. FormsAuthentication Cookie are Encrypted so there must exist a algorithm that can decode it or a kind of dll that I can load in Java and read it.

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