I have a case that I need my application run on windows authentication mode but a specific folder I want to deny access for it and handle it like forms mode authentication
Do you have any suggestions how to handle this case and use something like multi authentication mode within one application !
It's possible - exact mechanism would depends upon where your user store is located at. For example, let's say you have your own users table in the database that you are using for doing Forms authentication. In such case, you can offer windows authentication by mapping your user to the windows user(s) - it can be as simple as maintaining a column in the users table.
Basic idea is to to configure ASP.NET to use forms authentication - the login page uses windows authentication and if user is authenticated then do not display login form. See this link for more info: http://mvolo.com/iis-70-twolevel-authentication-with-forms-authentication-and-windows-authentication/
On related note, see this SO question: Mixing Forms authentication with Windows authentication
Related
I need to implement something like Single Sign On for a application that is being used on both Intranet and Internet.
Now , the application uses its own table for storing User information and has more users than that present in the AD for the Company. Example contract workers/3rd party vendors etc and hence many users who don't belong to the Active directory of domain are listed in the User Table.
The Application is a bit old and currently it uses Form to authenticate the users.
But strangely authentication mode in the web.config file has the following entry for authentication. <authentication mode="None" />
I changed the authentication mode to Windows in web.config and in IIS 6 selected integrated Windows authentication and unchecked the anonymous access.
Now I have following two scenarios.
#1 Intranet
User logs in to the system using the System Credential which is stored in a AD
Now if user hits the link for the web application he should be logged in.
I have implemented this part by using Page.User.Identity.name in the Page load of login.aspx to check if the user exists in the DB.
#2 Internet
If I check it from a external network the browser prompts me for credential.
The requirement is that the user should not be prompted for credential instead should be shown the current Login page
I googled and ended up on stackoverflow every time. Sadly the solutions did not work out for me.
I stumbled upon this post by Scott Enabling Windows Authentication within an Intranet ASP.NET Web application and if you check the comments Scott refers to use of solution by commenter ripster in case application is accessed from internet as well as intranet. Though it didn't work out for me or may be I didn't do it properly.
It seems you require a mix of Windows and Forms authentication : The requirement is that the user should not be prompted for credential instead should be shown the current Login page
Thought to share this . May be it can help you as mostly I have seen people to like the second below mentioned solution a lot. ( Atleast when they read it.)
If you're in classic mode - you can have both Windows and Forms authentication. An alert will pop up
Challenge-based and login redirect-based authentication cannot be used
simultaneously
you can however ignore this warning. CarlosAg says that:
we decided to leave it there was because it is still behavior that many user
scenarios would be consider incorrect, since most of the time forms
authentication uses anonymous authentication and not windows.
Read here.
Now when you want to use integrated mode, This stack question : iis7 Challenge-based and login redirect-based authentication cannot be used simultaneously leads to this famous link: http://mvolo.com/iis-70-twolevel-authentication-with-forms-authentication-and-windows-authentication/, which allows to change the authentication way for a page.
Another way you can manage this when using windows authentication is to manage usernames using code:
string user = Request.ServerVariables["LOGON_USER"];
Refer this link: http://beensoft.blogspot.in/2008/06/mixing-forms-and-windows-authentication.html , which gives a different way of mixing Forms and Windows authentication.
This will probably turn out to be a doozie.
I'm developing an application in ASP.NET to be put on our company's intranet site. I've been handed a specification in regards to security and have no idea how to do it.
First part: The application is to use Windows Authentication. This part seems easy enough; I opened IIS in Administrative Tools, right clicked the node of my website, properties and checked 'Integrate Windows Authentication'. However, I have no idea how I will govern which people have access to my site. I'm thinking this should be taken care of at the database level. This is Q#1
Second part -- I have to implement a process for the following scenario: User 'Jane' can log in to our network, but does not have rights to my application. User 'Bob' does have rights to use my application. Bob needs to be able to sit at Jane's computer (under her network account), but be able to enter his credentials into my application and use it (even though Jane is logged into the local machine and network). This is Q#2
Any help, general direction, or advice would be appreciated. The winning lottery numbers would be appreciated even more.
Thanks,
Jason
You're looking for Windows Authentication and Authorization in ASP.NET
How To Use Windows Auth in ASP.NET
Authentication/Authorization Explained
How To Implement Windows Auth in ASP.NET
Part 2...you're right, that's tough. You'll need to roll your own custom security provider.
You'll have a login page, then check that against Active Directory yourself. From MSDN
ASP.NET also supports custom solutions
for using Windows authentication,
which bypasses IIS authentication. For
example, you can write a custom ISAPI
filter that checks the user's
credentials against Active Directory.
With this approach you must manually
create a WindowsPrincipal object.
You've got requirements around authentication and authorization here.
Authentication: The act of confirming identity
Authorization: The act of correlating an identity to a privilege (eg Read/Write/Delete)
Windows Authentication is useful if you want "auto-signon" capability. The site will "know" the user by ID without them having to sign in.
The need for users to login from multiple locations means that you must implement a login page. This would fulfill your requirement in which one user may sit at another's workstation and log in.
You will want to authenticate users against the Windows domain. This can be done with a custom membership provider. Here's a walkthrough:
http://msdn.microsoft.com/en-us/library/ms180890(v=vs.80).aspx
This will allow you to present a login page that will authenticate users with their domain username and password. This will authenticate users- the identity of the user will be stored in the HttpContext.User. You can then also maintain a user list in a database to store authorization data.
Also found this -- a pretty good resource for anybody out there who's in the same boat:
Mixing Forms and Windows Security in ASP.NET
http://msdn.microsoft.com/en-us/library/ms972958.aspx
I have an (ASP.NET 3.5) intranet application which has been designed to use forms authentication (along with the default aspnet membership system). I also store additional information about users in another table which shares its primary key with the aspnet_users table.
For users who are part of our domain I store their domain account name in the secondary users table, and I want to automatically log in users whose domain account name matches a name stored in the table.
I have read the guides which are available - they're all from two years ago or more and assume that you are able to activate Windows Authentication on a separate login page that allows you to extract the domain account name. From what I can tell, though, this is not possible in IIS7 (the overall authentication method is applied on all pages and cannot be selectively deactivated, and both authentication methods can't be applied on the same page).
Is there a way of getting IIS to pass through the windows domain account name of the requesting user? I don't need proper AD authentication, just the domain name.
Actually, you can do it. Bit late for #dr_draik, but this cropped up in a google result for me so I thought I'd share some knowledge.
If you're in classic mode - Enable both Windows and Forms auth. You'll get a warning about not being able to do both at once, but you can ignore it. Then, you can spelunk around various properties like
Code:
HttpContext.Current.Request.ServerVariables["LOGON_USER"]
and fish the username out of there.
If you're in integrated mode - 4021905 IIS7 Challenge-based and login redirect-based authentication cannot be used simultaneiously leads to IIS 7.0 Two-Level Authentication with Forms Authentication and Windows Authentication which is a module that allows you to selectively change the auth for different pages.
You could always set up 2 separate application in IIS7. One would have Windows Authentication enabled. The other would be the main app with forms authentication. If a user went to the windows authentication app, the page could grab their credentials and pass it to the forms authentication app.
(More for completeness of information really)
I asked a .Net security guy this question at a conference a while back. His response was that it is technically possible, but he'd never seen it done (and to let him know if I did it and it worked!).
He suggested the way it could be done was by making your own ISAPI filter and installing it into IIS. The ISAPI filter would intercept the requests and basically do the job that IIS does when using integrated authentication, but fall back to using forms if this was not present. This involved some complicated challenge/response logic in the filter. This was for IIS6 though, so it might be different in IIS7.
Whilst this might be technically possible, I wouldn't suggest this route as it feels like a bit of a hack, and rolling your own security is never really a good idea (unless you really know what you are doing).
There are plenty articles on mixing the authenticaton by setting config to use the forms with allowing anonymous access to the app. Secondly, a page for integrated auth should be created with IIS settings set to deny anonymous and use Intgrated Authentication. There you would the magic trick by checking the "Logon_User" variable of the requets's ServerVariables collection. And finally for integrated authentication to silently sign in the user it has to have short hosted name. So if your forms authentication piece is exposed to internet via FQDN there should be some kind of redirect to the short host page. I think it is possible to achieve with just one application under IIS with 2 virtual directories.
I found a solution using no special add-ons. It was tricky and involved cobbling together elements from all the pages referenced here.
I posted about it: http://low-bandwidth.blogspot.com.au/2014/11/iis7-mixed-windows-and-forms.html
In essence, forms, windows and anon authentication have to be enabled.
The login screen should be forms based, and contain a button to trigger Windows login, that issues an HTTP 401 response challenge which if successful creates a forms based login ticket.
The issues are rather complex, and the post goes through the principles and the solution in detail.
Unfortunately, what you are trying to do just isn't supported. In order for ASP.NET to know the Windows username, you must use Windows Authentication.
You could set up another site / virtual directory that just forwarded the username information to another page. But what happens when non-Windows authenticated users try to log in?
I've got something you can try - not sure if it will work.
In the past we've used Request.ServerVariables["LOGON_USER"] but obviously for this to return a non-empty value you need to disable Anonymous access.
See this article: http://support.microsoft.com/default.aspx/kb/306359
It suggests keeping Anonymous access on the IIS side, and Forms authentication, but denying the anonymous user as follows:
<authorization>
<deny users = "?" /> <!-- This denies access to the Anonymous user -->
<allow users ="*" /> <!-- This allows access to all users -->
</authorization>
I have a website with a large user base configured with asp.net 2.0 forms authentication. Before the user logs in via forms authentication is it possible to retrieve the windows login name/user account name on the machine they are using?
Many thanks
It certainly is possible--by adding another web application to your system. Here's roughly how I have done it:
Your primary web app uses Forms authentication. On the forms login page, any user that is determined to be on the local LAN (check IP address), redirect them to another app that uses Windows authentication. In this second app, you can determine the user (assuming the browser is configured to send credentials automatically to the zone in which your app resides), then set a cookie which your first app can read, and redirect the user back to the original app.
This does work.
This would only be possible if you were using Windows Authentication in your web application and then only if the user had logged in.
The kind of information you are after is not sent as part of the web request (quite rightly) and is therefore unknown to the web server.
Unfortunately no - if the user has not logged on, they are browsing anonymously, and are therefore unknown to the server. There is no way to identify them.
Once they're logged on, if you're using impersonation use WindowsIdentity.GetCurrent().Name. However, for forms authentication there's no direct way to ask the browser for their Windows credentials as they may not even be running Windows!
Not BEFORE no (not from the server).
Depending on the type of Auth you use, though, and the way the site is configured, you CAN get them to log in with their windows details.
See Mixing Forms and Windows Security in ASP.NET on Microsoft's MSDN.
The main difference with #TheObjectGuy answer is that instead of using 2 websites, this does all in a single website by configuring IIS to use the Integrated Windows authentication just in a "single" page (WinLogin.aspx).
I have a bit of a hybrid situation on my hands. I'm writing an intranet asp.net web app. I don't want to use full blown Windows Authentication, because I don't have proper groups set up in Active Directory to be able to authenticate users simply based on what group they are in. Up until now, I had created a membership database, and was manually authenticating users based on their NT Login. The app is getting more complex, and I'm looking at using the Membership and Roles providers to authenticate users. Here's my issue: I want to be able to authenticate users just based on their NT, but I don't want to use Windows Authentication. I want to write my own provider to plug into the membership and roles providers, and use Forms authentication, but make it transparent. Based on a Users table, I want to be able to authenticate the user or redirect them based on their NT alone. Is this possible, or am I stuck writing my own small framework to accomplish this? I would like to take advantage of the provider framework if at all possible.
Set your web.config to use Forms Authentication.
Make sure Integrated Authentication is turned on in IIS (you may need to disable anonymous as well). This will allow you to get the user's NT name.
You can get the user's NT name with:
Request.ServerVariables["LOGON_USER"]
You can log the user in, no password needed, with:
FormsAuthentication.RedirectFromLoginPage( userName, false );