qr code generator asp net c# Lesson 1: Authenticating and Authorizing Users in C#.NET

Make QR Code in C#.NET Lesson 1: Authenticating and Authorizing Users

Lesson 1: Authenticating and Authorizing Users
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// Allow the creation of an empty object public CustomIdentity() { this.name = String.Empty; this.isAuthenticated = false; this.authenticationType = "None"; this.firstName = String.Empty; this.lastName = String.Empty; this.address = String.Empty; this.city = String.Empty; this.state = String.Empty; this.zip = String.Empty; } // Allow caller to create the object and specify all properties public CustomIdentity(bool isLogin, string newAuthenticationType, string newFirstName, string newLastName, string newAddress, string newCity, string newState, string newZip) { // Create a unique username by concatenating first and last name this.name = newFirstName + newLastName; this.isAuthenticated = isLogin; this.authenticationType = newAuthenticationType; this.firstName = newFirstName; this.lastName = newLastName; this.address = newAddress; this.city = newCity; this.state = newState; this.zip = newZip; } // Implement public read-only interfaces for standard properties public bool IsAuthenticated { get { return this.isAuthenticated; } } public string Name { get { return this.name; } } public string AuthenticationType { get { return this.authenticationType; } } // Implement public, read-only interfaces for custom properties public string FirstName { get { return this.firstName; } } public string LastName { get { return this.lastName; } } public string Address { get { return this.address; } }
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public string City { get { return this.city; } } public string State { get { return this.state; } } public string Zip { get { return this.zip; } } }
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BEST PRACTICES When not to implement IIdentity
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This code shows how to implement a custom identity based on IIdentity. However, if you want to add properties to a Windows logon while still using the Windows token or other Windows security properties, base your custom identity on the WindowsIdentity class instead. The same applies for IPrincipal and WindowsPrincipal.
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How to Create a Custom Principal Class
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Just as WindowsIdentity is based on IIdentity, the WindowsPrincipal and GenericPrincipal classes are based on the IPrincipal interface. Objects based on the IPrincipal interface represent the security context of a user, including that user s identity and any roles or groups to which they belong. To implement IPrincipal, you must implement at least one constructor, one property, and one method. The constructor must accept an IIdentity object and an array of strings containing the identity s roles, although you can add overloaded constructors. The property that you must implement is IPrincipal.Identity, which should return the principal s identity object (which must be defined when the object is constructed). The method is the Boolean IPrincipal.IsInRole, which takes a single string and the role being queried, and returns true when the principal s identity is a member of that role. Otherwise, it returns false. You can add some interesting functionality by overriding IPrincipal:
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Add a Roles property that returns an array of strings containing the roles the user is a member of. Add IsInAllRoles and IsInAnyRole methods that determine whether the user is a member of multiple roles. Add IsHigherThanRole and IsLowerThanRole methods to enable hierarchical group memberships. For example, a principal who is a member of the Presidents role would evaluate IPrincipal.IsHigherThanRole( Vice-Presidents ) as true.
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Lesson 1: Authenticating and Authorizing Users
To create a custom principal class, implement it based on IPrincipal; and at a minimum override the constructor, the Identity property, and the IsInRole method. For example, the following class implements the IPrincipal interface without extending the functionality:
' VB Public Class CustomPrincipal Implements IPrincipal ' Implement private variables for standard properties Private _identity As IIdentity Private _roles As String() ' Allow caller to create the object and specify all properties Public Sub New(ByVal identity As IIdentity, ByVal roles As String()) _identity = identity roles.CopyTo(_roles, 0) Array.Sort(_roles) End Sub ' Implement public read-only interfaces for standard properties Public Function IsInRole(ByVal role As String) As Boolean _ Implements IPrincipal.IsInRole If Array.BinarySearch(_roles, role) >= 0 Then Return True Else Return False End If End Function Public ReadOnly Property Identity() As IIdentity _ Implements IPrincipal.Identity Get Return _identity End Get End Property End Class
// C# class CustomPrincipal : IPrincipal { private IIdentity _identity; private string[] _roles; // Allow caller to create the object and specify all properties public CustomPrincipal(IIdentity identity, string[] roles) { _identity = identity;
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