Below is the scenario for a virtual directory following are the setting in IIS
Enable Anonymous Access is DISABLED (check box is unchecked).
Integrated Windows Authentication is DISABLED (check box is unchecked)
Basic authentication is ENABLED (checkbox is selected)
In the web.config of the webapplication (for the same virtual directory above) the setting is as follows:
When I browse an aspx page of the above web application it asks for username and password.
User enters username and password (in the dialog which appears as a part of windows authentication).
I can get the username that user has entered if the login is successful.
Is there any way I can get the username(that user has entered) even if the login fails.
Regards,
test_win
I don't believe that failed authentication information is stored in IIS in a way that's exposed to ASP.NET. If you were doing forms based authentication you would be able to track the invalid username/password, but since IIS is handling the authentication, I don't think you can get that information from code.
The logon attempt would be stored in the IIS log files, which you could process later from a separate process. You would want to look for 401/403 errors where a username is supplied.
Related
I created a ASP.Net C# MVC app with "Individual User Account" for Authentication + localDB. I started the app in visual studio with IIS express on localhost, signed up an user and logged in with that user.
I am trying to understand how back-end know a user has logged in in the following scenario:
start the iis express & app in visual studio
log in
stop the iis express & app in visual studio
start again the iis express & app in visual studio
user still logged in (WHY???)
I checked the user tables in db, and could not find any fields indicate a logged in user. I am thinking stop & restart iis express should clear everything in the back-end as well.
So how does the back-end know there was an user logged in in the step 5 above??
I found the following cookie in the http request
Cookie: _ga=GA1.1.1546797954.1551225891; __RequestVerificationToken=PSFeb9iP4aZr3wxxb8nJNKtki_1XPTzGO1Hzaf0W3iDsSCnV_qCfMsC9TY980X51c2rANZA-zureu6UHKEssAHza58AdmQUdZVL98VGYlRc1; .AspNet.ApplicationCookie=VUPznoprBRK2z13u03ArrC9HLHeGGUyTSvu9rYpSnZju_Rz4X2V5n9faw0EhnmuFjVN1AIva7HZSAhUBeSZ5jQHSej6XaAExy0hkwF_9vC190LfWBPP-oH3Zp0jj0ZmZ7L3sLlLqux4HV5CZSA-jqhDF4IXAFKyisFFV136PlxrJTmb9OXRrmo9rigCiIy0z_oixDlg1eHVI3T6ptVgn1Qhohtr1mTqoBJsF7gi7CHymSBlyFJ5MgYxfPcWNhJnj3H-WWK1ijkfzxsm0R13m2_6IbIiK1y5uzQBkklb8oMuz0mD27GlwMzteQBP3VLOXn77BreOPefJ8_2AekYjFGjgBIGGpngxLVzDneT4rC-BDiVKdWO_FRuail4ivVAN2ZJtdjK0uEPqnln5rmOlT0MLAhYzHMkk-HTvtW-Xo-Kexinlh58uxz0E7bncY5I6troc19E0fBLMnfXThtaL7ur6CN4pqUyq4yALJCTHszG3RPLQoJja0u1g34i-mKunZ
In web development there is very basic concept called cookie.The cookie is responsible too store user information in browser. When you sign-in in membership system ,it adds a special header called Set-Cookie to response which afterward get's stored in browser cache.The information send through header contains information about loged in user's identity. With subsequent requests browser send the same cookie to the server and the membership system parses that info to identify the user which makes request and if the information is valid you are logged in and system identifies you.
EDIT :
The detail of operations taking place is not unique and depends on which library you use for authentication but if you use asp.net default authentication system then you can go and see how things get done in the source code.For ASP.NET CORE check https://github.com/aspnet/AspNetIdentity and for ASP.NET MVC check : https://github.com/aspnet/Identity
Following is how authentication works in ASP.NET MVC
Enter Username and password in login form and click on "Login" button
On click of Login button Server side code checks whether entered Username and Password exists in database
If entered Username and Password exists in database then server side code creates cookie and stores them in the browser(not in the database)
On every page request IIS checks whether authentication cookie exists or not.
If cookie exists then user is logged In and if cookie doesn't exist the user is not logged in
Since authentication cookie is stored in browser and not in IIS. Stopping and Starting IIS has no effect on User log in status.
To answer your specific question: So how does the back-end know there was an user logged in in the step 5 above??
Ans: On ever page request from IIS. Along with other information, authentication cookie stored in browser is sent to back-end/IIS. back-end/IIS then checks whether or not authentication cookie is valid. If cookie is valid back-end/IIS knows user is logged in. If cookie is invalid back-end/IIS knows user is not logged in.
To understand this process further. I would recommend reading about cookies first and then read about authentication in ASP.NET.
Hope this helps!
I am attempting to use Integrated Windows Authentication on IIS for an MVC web app. The original hope was that the user would be logged in automatically using the current Windows user credentials. I am running into the issue where the user is always prompted to enter user name and password. I have decided that we can live with this. However, I have also noticed that the user can enter any valid domain credentials...it's not limited to the currently logged in machine. But if this is the case, I need to provide a logout button, so the user can be switched if necessary.
Everything I can find on this issue, logging out in Windows Authentication, says you cannot do it because it pulls the credentials from the machine login. But it's obviously not doing that in my case, because I can enter any valid credentials and log in successfully. So a user could be logged onto the machine as user X, and then, when prompted, log into the web app as user Y. Am I to understand that, under Windows Authentication, there's no way to address this?
Are you sure you selected Windows Authentication While creating the Project? Confirm that and if yes, proceed to check your web.config that application authentication is set to windows.
I have a C#.NET 4.0 application running under IIS 7 on Windows Server 2008 with IIS7 server. The application will run in the company intranet that automatically grabs the logged-in Windows username of the person viewing the page without being prompted to enter credentials when the page loads. Now i'm facing 2 problems:
1) Currently, the apps returns the production server name (eg: XYZ\sam) that the application located at. I want to get the current logged on username (eg: ABC\sam). It works fine at localhost but not at production server.
I've enabled <authentication mode="Windows" /> at web.config , enabled windows authentication and disabled anonymous authentication at IIS.
I've tried Page.User.Identity.Name, System.Web.HttpContext.Current.User.Identity.Name, System.Security.Principal.WindowsIdentity.GetCurrent().Name, and others but still failed to get the right name. How to get the current windows logged on user?
2) When I want to access the application, it keeps prompting out a windows for username and password. If I ignore it, it will prompt out
401 - Unauthorized: Access is denied due to invalid credentials. You
do not have permission to view this directory or page using the
credentials that you supplied.
How i gona fix it?
For question 1, it cannot retrieve the logged in username because the server is domain server. It works after transfer from workgroup to domain.
For question 2, it works fine(no pop out credential) if I access with the server name (eg:servername/appsname). But it will ask for credential if I use ip (eg:xxx.xx.xx.x/appsname) and didn't setup the tools internet options. Factor still not known.
For your 2 problem, to log automatically, you have to set it on the browser, for my experience, i have done this in IE: https://superuser.com/questions/537416/how-to-make-internet-explorer-automatically-login-in-a-certain-domain
I want to get the client window username with which the user is logged in on their machine,
I have tried these:
Request.servervariable["LOGON_USER"],
Request.servervariable["AUTH_USER"],
Request.servervariable["REMOTE_USER"]
but when I deploy my application on IIS the values of all these are blank,
some constraints are applied for my app senario: I am using the authentication mode ="form"
because I am passing the Windows account username to db, then I'm authenticating if this Windows user id is present in db.
Similarly I want anonymous access in IIS.
Assuming you've enabled windows authentication, Page.User.Identity.Name should give you that!
I'm trying to develop an intranet app/website that uses Windows authentication.
I'd like to test it with multiple users, for roles etc.
At the moment I'm only using my own domain account. Is there a way I could simulate different users for the site?
As a picture is worth a thousand words here it goes how to do it in IE based on 2GDev's comment copied here for clarity:
Go to Internet Options => Security => Local Intranet => Custom Level
and change the User Authentication to "Prompt for username and
password"
Click OK then Apply. Close the browser. Reopen it and point it to the website's URL you want to debug. You should happily see the login prompt where you can login with a different User account to simulate concurrency for example (this is what I'm doing right now here):
When you use Windows Authentication you can change your identity by running the browser as another user.
In windows, go to the browser exe (or a shortcut), right-click on the icon and select "Run as.." from the menu. This will prompt you to specify the username and password to run the account under.
Provided the identity you specify has access to the machine you are running on, the browser will then be running "as" identity specified. If you browse to a site using Windows Authentication, it will authenticate using the identity specified, instead of your own.
Use Impersonation...
From MSDN
Impersonation
An ASP.NET application can use impersonation to perform operations and
access resources with the security context of the authenticated client
or of a specific Windows account.
And in your web.config
<identity impersonate="true" username="TestUser" password="P#ssw0rd" />
How about to install and run the Virtual PC with some ready for download installed systems from MS ?
By running a virtual pc on your computer you can emulate connections to your pc and at the same time, its looks like a diferent computer, with diferent Ip.
In my case, there are db tables with users and their properties. In users table got login field (Domain/UserName). Also got custom Identity and Principal, which using this table to authenticate user in global.asax autherticate_request method.
To simulate different users in debug mode, there is special control rendered in master page (or layout page for mvc). It contain select box with all users, and apply button.
On server side after apply button click in session pushed emulated user login and sending refresh to response.
So in next authenticate event occured checking for emulated user login in session and if it exists then authenticate continues based on emulateded login.
Bad side: need sync service to always have actual user table based on current AD.