在選擇AD登錄時，其實可以直接選擇 Windows 授權，不過因為有些網站需要的是LDAP獲取信息進行授權，而非直接依賴Web Server自帶的Windows 授權功能。

當然如果使用的是Azure AD/企業賬號登錄時，直接在ASP.NET Core創建項目時選擇就好了。
來個ABC：
1.新建一個ASP.NET Core項目ABC

2.Nuget引用dependencies / 修改 project.json
Novell.Directory.Ldap.NETStandard
Microsoft.AspNetCore.Authentication.Cookies
版本如下：

"Novell.Directory.Ldap.NETStandard": "2.3.5",
"Microsoft.AspNetCore.Authentication.Cookies": "1.1.0"

本文的AD登錄使用的是第三方的
Novell.Directory.Ldap.NETStandard 進行的LDAP操作（還沒有看這個LDAP的庫是否有安全性問題，如果有需要修改或更換）

3.建立一個LDAP操作的工具類
代碼在下面，基本上就2個方法：
Register是獲取基本配置信息的
Validate是來驗證用戶名密碼的

using System;
using Microsoft.Extensions.Configuration;
using Novell.Directory.Ldap;

namespace Demo
{
    public class LDAPUtil
    {
        
 
public static string Host { get; private set; }
        public static string BindDN { get; private set; }
        public static string BindPassword { get; private set; }
        public static int Port { get; private set; }
        public static string BaseDC { get; private set; }
        public
 
 static string CookieName { get; private set; }

        public static void Register(IConfigurationRoot configuration)
        {
            Host = configuration.GetValue<string>("LDAPServer");
            Port = configuration?.GetValue<int>("LDAPPort") ?? 389;
            BindDN = configuration.GetValue<string>("BindDN");
            BindPassword = configuration.GetValue<string>("BindPassword");
            BaseDC = configuration.GetValue<string>("LDAPBaseDC");
            CookieName = configuration.GetValue<string>("CookieName");
        }

        

        public static bool Validate(string username, string password)
        {
            try
            {
                using (var conn = new LdapConnection())
                {
                    conn.Connect(Host, Port);
                    conn.Bind($"{BindDN},{BaseDC}", BindPassword);
                    var entities =
                        conn.Search(BaseDC,LdapConnection.SCOPE_SUB,
                            $"(sAMAccountName={username})",
                            new string[] { "sAMAccountName" }, false);
                    string userDn = null;
                    while (entities.hasMore())
                    {
                        var entity = entities.next();
                        var account = entity.getAttribute("sAMAccountName");
                        //If you need to Case insensitive, please modify the below code.
                        if (account != null && account.StringValue == username)
                        {
                            userDn = entity.DN;
                            break;
                        }
                    }
                    if (string.IsNullOrWhiteSpace(userDn)) return false;
                    conn.Bind(userDn, password);
                    // LdapAttribute passwordAttr = new LdapAttribute("userPassword", password);
                    // var compareResult = conn.Compare(userDn, passwordAttr);
                    conn.Disconnect();
                    return true;
                }
            }
            catch (LdapException)
            {
               
                return false;
            }
            catch (Exception)
            { 
                return false;
            }
        }

    }
}

4.在applicationSettings.json中添加基本的域配置

"LDAPServer": "192.168.1.1",//域服務器
"LDAPPort": 389,//端口，一般默認就是這個
"CookieName": "testcookiename",//使用Cookie登錄的Cookie的Key
"BindDN": "CN=DoWebUser,CN=Users",//用來獲取LDAP的信息用戶的用戶名
"BindPassword": "!DoWebUserPassword",//用來獲取LDAP的信息的用戶的密碼，即DoWebUser的密碼
"LDAPBaseDC": "DC=aspnet,DC=com",//域的DC

5.Startup.cs中修改
Startup方法中：

LDAPUtil.Register(Configuration);

ConfigureServices 方法中：

services.AddAuthorization(options =>{});

Configure方法中：

app.UseCookieAuthentication(new CookieAuthenticationOptions()
{
AuthenticationScheme = Configuration.GetValue<string>("CookieName"),
LoginPath = new PathString("/Account/Login/"),
AccessDeniedPath = new PathString("/Account/Login/"),
AutomaticAuthenticate = true,
AutomaticChallenge = true
});

6.AccountController中添加登錄和註銷的Action

登錄的頁面：

[AllowAnonymous]
public IActionResult Login()
{
    return View();
}

登錄的Post頁面：

[HttpPost]
[AllowAnonymous]
public async Task<IActionResult> Login(string u, string p)
{
    if (LDAPUtil.Validate(u, p))
    {
        var identity = new ClaimsIdentity(new MyIdentity(u));//這個MyIdentity只是一個祼的IIdentity的實現的類
        var principal = new ClaimsPrincipal(identity);
        await HttpContext.Authentication.SignInAsync(LDAPUtil.CookieName, principal);
        return RedirectToAction("Index", "Home");
    }
    return View();
}

註銷的頁面：

[Authorize]
public async Task<IActionResult> Logout()
{
   await HttpContext.Authentication.SignOutAsync(LDAPUtil.CookieName);
   return RedirectToAction("Index", "Home");
}

Demo
https://github.com/chsword/aspnet-core-ad-authentication

引用
https://github.com/dsbenghe/Novell.Directory.Ldap.NETStandard
https://www.nuget.org/packages/Microsoft.AspNetCore.Authentication.Cookies/

原文鏈接

ASP.NET Core AD 域登錄 （轉載）