You can use declaratively the PrincipalPermission attribute, in your code, when you want to validate the current user’s credentials. You can attach it to a given class or method and the CLR checks it automatically when the corresponding code runs. In this case time you cannot catch the exception within the function on which the attribute …
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How to use PrincipalPermission objects to evaluate authorization roles in ASP.NET in VB.NET
You can use the PrincipalPermission approach described in the article How to use the PrincipalPermission Class to check authorization in ASP.NET in VB.NET to evaluate more complex authentication rules.
For example, your application can have three users User1 , User2 and User3. By using the approach described in the article How to use IsInRole method …
How to use the PrincipalPermission Class to check authorization in ASP.NET in VB.NET
.NET provides alternative way to enforce role and user rules. Instead of approach described in the article How to use IsInRole method to check authorization in ASP.NET in VB.NET, you can use the PrincipalPermission class from the System.Security.Permissions namespace. You should follow the next steps:
1. Create a PrincipalPermission object that represents the …
How to use IsInRole method to check authorization in ASP.NET in VB.NET
You can use IsInRole() method to evaluate whether a user is a member of a group. This method accepts the role name as a string name and returns true if the user is a member of that role.
You can use the next code to check if the current user is a member of the Supplier role:
If …
How to perform the Impersonation as a step of Programmatic Impersonation in VB.NET
Configured impersonation, described in the article How to use Configured Impersonation in ASP.NET, allows you to impersonate a user for the entire duration of a request. By using programmatic impersonation (based on the WindowsIdentity.Impersonate() method) , you have more control, such as the ability to impersonate a user for only part of the page request. This …
How to get a token as a step of Programmatic Impersonation in VB.NET
Configured impersonation, described in the article How to use Configured Impersonation in ASP.NET, allows you to impersonate a user for the entire duration of a request. By using programmatic impersonation (based on the WindowsIdentity.Impersonate() method) , you have more control, such as the ability to impersonate a user for only part of the page request. This …
How to access IdentityReference and Role information in Windows Authentication in VB.NET
The .NET Framework distributes with a set of IdentityReference classes. An IdentityReference is a reference to a valid Windows identity (which is computer, user accounts or Windows group) that is expressed through a SID. Every time when system administrator creates a user, a group, or he/she set up a new machine with Windows, he/she gets a …
How to use WindowsIdentity class in Windows Authentication in VB.NET
When your project is based on Windows authentication you can access some additional information about the currently authenticated user by casting the general identity object to a WindowsIdentity object. The next table lists additional members provided by WindowsIdentity:
Member
Description
IsAnonymous
Returns true if the user is anonymous (has not been authenticated).
IsGuest
Returns …
How to use WindowsPrincipal class in Windows Authentication in VB.NET
You can use WindowsPrincipal class to access WindowsIdentity object through the Identity property. You need this when your project is based on Windows authentication and you use in your code User property which returns an IPrincipal object as instance of the WindowsPrincipal class. The class implements four overloads of IsInRole() that all check whether the user …
When your Web project is based on Windows authentication it does not require a login page. When end user requests a Web page that requires authentication, his browser transmits the credential to IIS and your application than retrieves information from the User property of the web page. You can use the next subroutine to display the …