如何在 ASP.NET MVC 5 中实现自定义身份验证 [英] How to implement custom authentication in ASP.NET MVC 5

问题描述

我正在开发一个 ASP.NET MVC 5 应用程序.我有一个现有的数据库，我从中创建了我的 ADO.NET 实体数据模型.我在那个数据库中有一个包含用户名"和密码"列的表，我想用它们在我的 Webapp 中实现身份验证和授权；由于客户的要求，我无法创建任何其他数据库或表或列，也无法使用标准身份验证.我不需要管理注册、密码更改或其他事情:只需使用密码和用户名登录.我怎样才能做到这一点?

I'm developing an ASP.NET MVC 5 application. I have an existing DB, from which I created my ADO.NET Entity Data Model. I have a table in that DB which contains "username" and "password" column, and I want to use them to implement authentication and authorization in my Webapp; I cannot create any other database or table or column and I cannot use the standard Identity authentication, because of customer's requirements. I don't need to manage signup, password changing or other stuffs: just login with password and username. How can I do that?

推荐答案

是的，你可以.认证和授权部分独立工作.如果您有自己的身份验证服务，则可以使用 OWIN 的授权部分.假设您已经有一个 UserManager 来验证 username 和 password.因此，您可以在回发登录操作中编写以下代码:

Yes, you can. Authentication and Authorization parts work independently. If you have your own authentication service you can just use OWIN's authorization part. Consider you already have a UserManager which validates username and password. Therefore you can write the following code in your post back login action:

[HttpPost]
public ActionResult Login(string username, string password)
{
    if (new UserManager().IsValid(username, password))
    {
        var ident = new ClaimsIdentity(
          new[] { 
              // adding following 2 claim just for supporting default antiforgery provider
              new Claim(ClaimTypes.NameIdentifier, username),
              new Claim("http://schemas.microsoft.com/accesscontrolservice/2010/07/claims/identityprovider", "ASP.NET Identity", "http://www.w3.org/2001/XMLSchema#string"),

              new Claim(ClaimTypes.Name,username),

              // optionally you could add roles if any
              new Claim(ClaimTypes.Role, "RoleName"),
              new Claim(ClaimTypes.Role, "AnotherRole"),

          },
          DefaultAuthenticationTypes.ApplicationCookie);

        HttpContext.GetOwinContext().Authentication.SignIn(
           new AuthenticationProperties { IsPersistent = false }, ident);
        return RedirectToAction("MyAction"); // auth succeed 
    }
    // invalid username or password
    ModelState.AddModelError("", "invalid username or password");
    return View();
}

你的用户经理可以是这样的:

And your user manager can be something like this:

class UserManager
{
    public bool IsValid(string username, string password)
    {
         using(var db=new MyDbContext()) // use your DbConext
         {
             // for the sake of simplicity I use plain text passwords
             // in real world hashing and salting techniques must be implemented   
             return db.Users.Any(u=>u.Username==username 
                 && u.Password==password); 
         }
    }
}

最后，您可以通过添加 Authorize 属性来保护您的操作或控制器.

In the end, you can protect your actions or controllers by adding an Authorize attribute.

[Authorize]
public ActionResult MySecretAction()
{
    // all authorized users can use this method
    // we have accessed current user principal by calling also
    // HttpContext.User
}

[Authorize(Roles="Admin")]
public ActionResult MySecretAction()
{
    // just Admin users have access to this method
} 

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