Visual Studio 2005 : System.Security.Principal new classes

Saturday, January 20, 2007



New classes have been added to System.Security.Principal namespace in Visual Studio 2005


The System.Security.Principal namespace has three new classes in .NET 2.0. They are explained briefly below.

  • SecurityIdentifier: A Windows account is internally represented by OS as a security identifier. The account could be a user account, a group or a computer in the network domain. The SecurityIdentifier class encapsulates the binary representation of the SID.
  • NTAccount: A Windows account in human readable text form
  • IdentityReference: Acts as a base class defining common members for SecurityIdentifier and NTAccount. The class is not creatable by the programmer.

You can use either a SID or a name to identify windows accounts and can also derive one from the other as shown in the code snippet below.

//Get the security identifier of currently-logged in user.

SecurityIdentifier objSecId = WindowsIdentity.GetCurrent().User;

//Get the corresponding NT Account name.

NTAccount objNTAccount = (NTAccount) objSecId.Translate(typeof(NTAccount));

These classes can be used in conjunction with API for controlling ACLs under System.Security.AccessControl namespace.

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