6月15日，在端午节前的最后一个工作日，想起有段日子没有写过文章了，倒有些荒疏了。今借夏日蒸蒸之气，偷得浮生半日悠闲。闲话就说到这里吧，提前祝大家端午愉快（屈原听了该不高兴了：））！
.NetCore自发布以来，颇受关注，现在.Net Core2.0已经正式发布，边迫不及待的将.Net跨平台移植的工作进行到底。想来，也费不了多少事儿。我经常和同事们说，要敢于尝试新鲜事物，不阴损守旧，方能使自己不断进步，站在队伍的前列。下面就关于Asp.Net Core在Web 及API项目上身份认证的问题做下简单的阐述。
一、Asp.Net Core Web项目的登录认证
在MVC Web项目中，做用户登录授权，是必不可少的工作，不知道大家平时是怎么做的，我想，大多朋友还是使用微软提供的一套认证机制，可以省去很多功夫。从WebForm时代的Form身份认证，无非是通过客户端Cookie中存储认证票据，在请求受保护的资源时，通过Cookie中携带的身份票据，再有Asp.net的认证模块，完整对请求者的身份认证。这一过程，是很清晰简单的了。在MVC中，大多是通过中间件（MiddleWare）来完整认证授权过程。在ASP.NETMVC中，我们了解到基于声明的授权认证（Claim），这种认证方式，好处在于，我们想在用户授权时，存储多个属性信息，只需要添加多个声明即可，我们在微软的认证中间件中，看到的都是定义好的常量，当然，我们可以定义自己的ClaimTypes。然我们看看微软在.NetCore中定义的一些声明吧：
//
// Summary:
// http://schemas.xmlsoap.org/ws/2009/09/identity/claims/actor.
public const string Actor = "http://schemas.xmlsoap.org/ws/2009/09/identity/claims/actor";
//
// Summary:
// The URI for a claim that specifies the postal code of an entity, http://schemas.xmlsoap.org/ws/2005/05/identity/claims/postalcode.
public const string PostalCode = "http://schemas.xmlsoap.org/ws/2005/05/identity/claims/postalcode";
//
// Summary:
// The URI for a claim that specifies the primary group SID of an entity, http://schemas.microsoft.com/ws/2008/06/identity/claims/primarygroupsid.
public const string PrimaryGroupSid = "http://schemas.microsoft.com/ws/2008/06/identity/claims/primarygroupsid";
//
// Summary:
// The URI for a claim that specifies the primary SID of an entity, http://schemas.microsoft.com/ws/2008/06/identity/claims/primarysid.
public const string PrimarySid = "http://schemas.microsoft.com/ws/2008/06/identity/claims/primarysid";
//
// Summary:
// The URI for a claim that specifies the role of an entity, http://schemas.microsoft.com/ws/2008/06/identity/claims/role.
public const string Role = "http://schemas.microsoft.com/ws/2008/06/identity/claims/role";
//
// Summary:
// The URI for a claim that specifies an RSA key, http://schemas.xmlsoap.org/ws/2005/05/identity/claims/rsa.
public const string Rsa = "http://schemas.xmlsoap.org/ws/2005/05/identity/claims/rsa";
//
// Summary:
// The URI for a claim that specifies a serial number, http://schemas.microsoft.com/ws/2008/06/identity/claims/serialnumber.
public const string SerialNumber = "http://schemas.microsoft.com/ws/2008/06/identity/claims/serialnumber";
//
// Summary:
// The URI for a claim that specifies a security identifier (SID), http://schemas.xmlsoap.org/ws/2005/05/identity/claims/sid.
public const string Sid = "http://schemas.xmlsoap.org/ws/2005/05/identity/claims/sid";
//
// Summary:
// The URI for a claim that specifies a service principal name (SPN) claim, http://schemas.xmlsoap.org/ws/2005/05/identity/claims/spn.
public const string Spn = "http://schemas.xmlsoap.org/ws/2005/05/identity/claims/spn";
//
// Summary:
// The URI for a claim that specifies the state or province in which an entity resides,
// http://schemas.xmlsoap.org/ws/2005/05/identity/claims/stateorprovince.
public const string StateOrProvince = "http://schemas.xmlsoap.org/ws/2005/05/identity/claims/stateorprovince";
//
// Summary:
// The URI for a claim that specifies the street address of an entity, http://schemas.xmlsoap.org/ws/2005/05/identity/claims/streetaddress.
public const string StreetAddress = "http://schemas.xmlsoap.org/ws/2005/05/identity/claims/streetaddress";
//
// Summary:
// The URI for a claim that specifies the surname of an entity, http://schemas.xmlsoap.org/ws/2005/05/identity/claims/surname.
public const string Surname = "http://schemas.xmlsoap.org/ws/2005/05/identity/claims/surname";
//
// Summary:
// The URI for a claim that identifies the system entity, http://schemas.xmlsoap.org/ws/2005/05/identity/claims/system.
public const string System = "http://schemas.xmlsoap.org/ws/2005/05/identity/claims/system";
//
// Summary:
// The URI for a claim that specifies a thumbprint, http://schemas.xmlsoap.org/ws/2005/05/identity/claims/thumbprint.
// A thumbprint is a globally unique SHA-1 hash of an X.509 certificate.
public const string Thumbprint = "http://schemas.xmlsoap.org/ws/2005/05/identity/claims/thumbprint";
//
// Summary:
// The URI for a claim that specifies a user principal name (UPN), http://schemas.xmlsoap.org/ws/2005/05/identity/claims/upn.
public const string Upn = "http://schemas.xmlsoap.org/ws/2005/05/identity/claims/upn";
//
// Summary:
// The URI for a claim that specifies a URI, http://schemas.xmlsoap.org/ws/2005/05/identity/claims/uri.
public const string Uri = "http://schemas.xmlsoap.org/ws/2005/05/identity/claims/uri";
//
// Summary:
// http://schemas.microsoft.com/ws/2008/06/identity/claims/userdata.
public const string UserData = "http://schemas.microsoft.com/ws/2008/06/identity/claims/userdata";
//
// Summary:
// http://schemas.microsoft.com/ws/2008/06/identity/claims/version.
public const string Version = "http://schemas.microsoft.com/ws/2008/06/identity/claims/version";
//
// Summary:
// The URI for a claim that specifies the webpage of an entity, http://schemas.xmlsoap.org/ws/2005/05/identity/claims/webpage.
public const string Webpage = "http://schemas.xmlsoap.org/ws/2005/05/identity/claims/webpage";
//
// Summary:
// The URI for a claim that specifies the Windows domain account name of an entity,
// http://schemas.microsoft.com/ws/2008/06/identity/claims/windowsaccountname.
public const string WindowsAccountName = "http://schemas.microsoft.com/ws/2008/06/identity/claims/windowsaccountname";
//
// Summary:
// http://schemas.microsoft.com/ws/2008/06/identity/claims/windowsdeviceclaim.
public const string WindowsDeviceClaim = "http://schemas.microsoft.com/ws/2008/06/identity/claims/windowsdeviceclaim";
//
// Summary:
// http://schemas.microsoft.com/ws/2008/06/identity/claims/windowsdevicegroup.
public const string WindowsDeviceGroup = "http://schemas.microsoft.com/ws/2008/06/identity/claims/windowsdevicegroup";
//
// Summary:
// http://schemas.microsoft.com/ws/2008/06/identity/claims/windowsfqbnversion.
public const string WindowsFqbnVersion = "http://schemas.microsoft.com/ws/2008/06/identity/claims/windowsfqbnversion";
//
// Summary:
// http://schemas.microsoft.com/ws/2008/06/identity/claims/windowssubauthority.
public const string WindowsSubAuthority = "http://schemas.microsoft.com/ws/2008/06/identity/claims/windowssubauthority";
//
// Summary:
// The URI for a claim that specifies the alternative phone number of an entity,
// http://schemas.xmlsoap.org/ws/2005/05/identity/claims/otherphone.
public const string OtherPhone = "http://schemas.xmlsoap.org/ws/2005/05/identity/claims/otherphone";
//
// Summary:
// The URI for a claim that specifies the name of an entity, http://schemas.xmlsoap.org/ws/2005/05/identity/claims/nameidentifier.
public const string NameIdentifier = "http://schemas.xmlsoap.org/ws/2005/05/identity/claims/nameidentifier";
//
// Summary:
// The URI for a claim that specifies the name of an entity, http://schemas.xmlsoap.org/ws/2005/05/identity/claims/name.
public const string Name = "http://schemas.xmlsoap.org/ws/2005/05/identity/claims/name";
//
// Summary:
// The URI for a claim that specifies the mobile phone number of an entity, http://schemas.xmlsoap.org/ws/2005/05/identity/claims/mobilephone.
public const string MobilePhone = "http://schemas.xmlsoap.org/ws/2005/05/identity/claims/mobilephone";
//
// Summary:
// The URI for a claim that specifies the anonymous user; http://schemas.xmlsoap.org/ws/2005/05/identity/claims/anonymous.
public const string Anonymous = "http://schemas.xmlsoap.org/ws/2005/05/identity/claims/anonymous";
//
// Summary:
// The URI for a claim that specifies details about whether an identity is authenticated,
// http://schemas.xmlsoap.org/ws/2005/05/identity/claims/authenticated.
public const string Authentication = "http://schemas.xmlsoap.org/ws/2005/05/identity/claims/authentication";
//
// Summary:
// The URI for a claim that specifies the instant at which an entity was authenticated;
// http://schemas.microsoft.com/ws/2008/06/identity/claims/authenticationinstant.
public const string AuthenticationInstant = "http://schemas.microsoft.com/ws/2008/06/identity/claims/authenticationinstant";
//
// Summary:
// The URI for a claim that specifies the method with which an entity was authenticated;
// http://schemas.microsoft.com/ws/2008/06/identity/claims/authenticationmethod.
public const string AuthenticationMethod = "http://schemas.microsoft.com/ws/2008/06/identity/claims/authenticationmethod";
//
// Summary:
// The URI for a claim that specifies an authorization decision on an entity; http://schemas.xmlsoap.org/ws/2005/05/identity/claims/authorizationdecision.
public const string AuthorizationDecision = "http://schemas.xmlsoap.org/ws/2005/05/identity/claims/authorizationdecision";
//
// Summary:
// The URI for a claim that specifies the cookie path; http://schemas.microsoft.com/ws/2008/06/identity/claims/cookiepath.
public const string CookiePath = "http://schemas.microsoft.com/ws/2008/06/identity/claims/cookiepath";
//
// Summary:
// The URI for a claim that specifies the country/region in which an entity resides,
// http://schemas.xmlsoap.org/ws/2005/05/identity/claims/country.
public const string Country = "http://schemas.xmlsoap.org/ws/2005/05/identity/claims/country";
//
// Summary:
// The URI for a claim that specifies the date of birth of an entity, http://schemas.xmlsoap.org/ws/2005/05/identity/claims/dateofbirth.
public const string DateOfBirth = "http://schemas.xmlsoap.org/ws/2005/05/identity/claims/dateofbirth";
//
// Summary:
// The URI for a claim that specifies the deny-only primary group SID on an entity;
// http://schemas.microsoft.com/ws/2008/06/identity/claims/denyonlyprimarygroupsid.
// A deny-only SID denies the specified entity to a securable object.
public const string DenyOnlyPrimaryGroupSid = "http://schemas.microsoft.com/ws/2008/06/identity/claims/denyonlyprimarygroupsid";
//
// Summary:
// The URI for a claim that specifies the deny-only primary SID on an entity; http://schemas.microsoft.com/ws/2008/06/identity/claims/denyonlyprimarysid.
// A deny-only SID denies the specified entity to a securable object.
public const string DenyOnlyPrimarySid = "http://schemas.microsoft.com/ws/2008/06/identity/claims/denyonlyprimarysid";
//
// Summary:
// The URI for a claim that specifies a deny-only security identifier (SID) for
// an entity, http://schemas.xmlsoap.org/ws/2005/05/identity/claims/denyonlysid.
// A deny-only SID denies the specified entity to a securable object.
public const string DenyOnlySid = "http://schemas.xmlsoap.org/ws/2005/05/identity/claims/denyonlysid";
//
// Summary:
// http://schemas.microsoft.com/ws/2008/06/identity/claims/windowsuserclaim.
public const string WindowsUserClaim = "http://schemas.microsoft.com/ws/2008/06/identity/claims/windowsuserclaim";
//
// Summary:
// http://schemas.microsoft.com/ws/2008/06/identity/claims/denyonlywindowsdevicegroup.
public const string DenyOnlyWindowsDeviceGroup = "http://schemas.microsoft.com/ws/2008/06/identity/claims/denyonlywindowsdevicegroup";
//
// Summary:
// http://schemas.microsoft.com/ws/2008/06/identity/claims/dsa.
public const string Dsa = "http://schemas.microsoft.com/ws/2008/06/identity/claims/dsa";
//
// Summary:
// The URI for a claim that specifies the email address of an entity, http://schemas.xmlsoap.org/ws/2005/05/identity/claims/email.
public const string Email = "http://schemas.xmlsoap.org/ws/2005/05/identity/claims/emailaddress";
那么我们在Asp.Net Core项目中的认证，也是比较简单的。也是通过HttpContext的扩展方法SignInAsync，来传入声明的身份信息。要使用的微软的认证组件，我们在.Net Core Web项目中，做如下改动：
首先，在Start.cs类中，添加服务，具体代码如下：
/// <summary>
///
/// </summary>
/// <param name="services"></param>
public void ConfigureServices(IServiceCollection services)
{
services.AddAuthentication(CookieAuthenticationDefaults.AuthenticationScheme)
.AddCookie(CookieAuthenticationDefaults.AuthenticationScheme, o =>
{
o.Cookie.Name = "_AdminTicketCookie";
o.LoginPath = new PathString("/Account/Login");
o.LogoutPath = new PathString("/Account/Login");
o.AccessDeniedPath = new PathString("/Error/Forbidden");
});
services.AddTransient<TiKu.Application.Interfaces.IAdminService, TiKu.Application.AdminService>();
services.AddMvc();
}
其次，添加认证中间件
/// <summary>
/// This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
/// </summary>
/// <param name="app"></param>
/// <param name="env"></param>
public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory)
{ if (env.IsDevelopment())
{
app.UseDeveloperExceptionPage();
}
else
{
app.UseExceptionHandler("/Home/Error");
}
app.UseStaticFiles();
app.UseAuthentication();//添加认证中间件
app.UseMvc(routes =>
{
routes.MapRoute(
name: "default",
template: "{controller=Home}/{action=Index}/{id?}");
}); }
最后，在用户登录的地方，登录成功后，调用HttpContext的SignIn方法，将授权信息写入Cookie，示例代码如下：
/// <summary>
/// <![CDATA[登陆]]>
/// </summary>
/// <param name="model"></param>
/// <returns></returns>
[HttpPost]
[ValidateAntiForgeryToken]
public async Task<ActionResult> Login(Models.LoginViewModel model)
{
try
{
//模型验证通过后
if (ModelState.IsValid)
{
model.password = TiKu.Common.Security.MD5.Md5(model.password);//MD5加密
TiKu.Domain.Entity.tb_Admin admin = await _AdminService.CheckAccountAndPassword(account: model.account, password: model.password);
//验证用户名密码
if (admin != null)
{
var identity = new ClaimsIdentity(CookieAuthenticationDefaults.AuthenticationScheme);//一定要声明AuthenticationScheme
identity.AddClaim(new Claim(ClaimTypes.Name, admin.Account));
identity.AddClaim(new Claim(ClaimTypes.NameIdentifier, admin.Id.ToString())); await HttpContext.SignInAsync(identity.AuthenticationType,
new ClaimsPrincipal(identity),
new AuthenticationProperties
{
IsPersistent = model.isPersistent,
RedirectUri = "/Home/Index",
ExpiresUtc = new System.DateTimeOffset(dateTime: DateTime.Now.AddHours(6)),
});
//更新登陆时间
await _AdminService.UpdateLastLoginTime(id: admin.Id);
}
else
{
await HttpContext.ChallengeAsync(CookieAuthenticationDefaults.AuthenticationScheme);
ModelState.AddModelError("", "用户名或密码错误！");
}
}
}
catch (Exception ex)
{
ModelState.AddModelError("", "用户名或密码错误！");
_Logger.Error("用户登录时发生错误！", ex);
}
return View(model);
}
这样就完成了Asp.net core web项目的登录认证工作。
二、Asp.Net Core WebApi基于JWT的认证授权
关于JWT的工作原理，大家可以自行了解（https://jwt.io/）。JWT实现了服务端无状态，在分布式服务，会话一致性，单点登录等方面，凸显优势，不占用服务端资源。使用JWT需要注意的是，令牌过期后刷新，以及更改密码后令牌未过期的处理问题。
这里，我以JWT作为.net core webapi项目的认证方式。
首先，我再Api项目中新建了一个名为OAuthController的控制器，定义一个Action名为Token的方法，用来让客户端获取令牌之用，具体代码如下：
/// <summary>
/// <![CDATA[获取访问令牌]]>
/// </summary>
/// <param name="user"></param>
/// <param name="password"></param>
/// <returns></returns>
[HttpPost]
public async Task<TiKu.Domain.ValueObject.RestfulData<TiKu.Domain.ValueObject.AccessTokenObj>> Token(string user, string password)
{
var result = new TiKu.Domain.ValueObject.RestfulData<TiKu.Domain.ValueObject.AccessTokenObj>();
try
{
if (string.IsNullOrEmpty(user)) throw new ArgumentNullException("user", "用户名不能为空！");
if (string.IsNullOrEmpty(password)) throw new ArgumentNullException("password", "密码不能为空！"); //验证用户名和密码
var userInfo = await _UserService.CheckUserAndPassword(mobile: user, password: password);
var claims = new Claim[]
{
new Claim(ClaimTypes.Name,user),
new Claim(ClaimTypes.NameIdentifier,userInfo.Id.ToString()),
}; var key = new SymmetricSecurityKey(System.Text.Encoding.UTF8.GetBytes(Configuration["JwtSecurityKey"]));
var expires = DateTime.Now.AddDays(28);//
var token = new JwtSecurityToken(
issuer: Configuration["issuer"],
audience: Configuration["audience"],
claims: claims,
notBefore: DateTime.Now,
expires: expires,
signingCredentials: new SigningCredentials(key, SecurityAlgorithms.HmacSha256)); //生成Token
string jwtToken = new JwtSecurityTokenHandler().WriteToken(token);
result.code = 1;
result.data = new Domain.ValueObject.AccessTokenObj() { AccessToken = jwtToken, Expires = TiKu.Common.Utility.Util.ToUnixTime(expires) };
result.message = "授权成功！";
return result;
}
catch (Exception ex)
{
result.message = ex.Message;
result.code = 0;
logger.Error("获取访问令牌时发生错误！", ex);
return result;
}
}
这里，我定义了一个统一返回数据格式的模型-RestfulData,其中有不返回数据data的RestfulData和带data数据的RestfulData<T>，以及返回集合类型的RestfulArray<T>，具体代码如下：
/// <summary>
///
/// </summary>
public class RestfulData
{
/// <summary>
/// <![CDATA[错误码]]>
/// </summary>
public int code { get; set; } /// <summary>
///<![CDATA[消息]]>
/// </summary>
public string message { get; set; } /// <summary>
/// <![CDATA[相关的链接帮助地址]]>
/// </summary>
public string url { get; set; } } /// <summary>
///
/// </summary>
/// <typeparam name="T"></typeparam>
public class RestfulData<T> : RestfulData
{
/// <summary>
/// <![CDATA[数据]]>
/// </summary>
public virtual T data { get; set; }
} /// <summary>
/// <![CDATA[返回数组]]>
/// </summary>
/// <typeparam name="T"></typeparam>
public class RestfulArray<T> : ResultData<IEnumerable<T>>
{ }
配置JWT认证服务，在Start.cs启动类中，配置如下：
/// <summary>
///
/// </summary>
/// <param name="services"></param>
public IServiceProvider ConfigureServices(IServiceCollection services)
{
services.AddSingleton<IConfiguration>(Configuration);
services.AddMemoryCache();//添加基于内存的缓存支持
services.AddAutofac(); //配置授权
services.AddAuthentication(options =>
{
options.DefaultAuthenticateScheme = "JwtBearer";
options.DefaultChallengeScheme = "JwtBearer"; }).AddJwtBearer("JwtBearer",
(jwtBearerOptions) =>
{
jwtBearerOptions.TokenValidationParameters = new TokenValidationParameters
{
ValidateIssuerSigningKey = true,
IssuerSigningKey = new SymmetricSecurityKey(System.Text.Encoding.UTF8.GetBytes(Configuration["JwtSecurityKey"])),//秘钥
ValidateIssuer = true,
ValidIssuer = Configuration["issuer"],
ValidateAudience = true,
ValidAudience = Configuration["audience"],
ValidateLifetime = true,
ClockSkew = TimeSpan.FromMinutes(5)
};
}); services.AddMvc(); //IOC Autofac
var builder = new ContainerBuilder();
builder.Populate(services); //注册应用服务
var assemblyApplicationService = System.Reflection.Assembly.Load("TiKu.Application");
builder.RegisterAssemblyTypes(assemblyApplicationService).AsImplementedInterfaces(); var container = builder.Build();
Container = container; return new AutofacServiceProvider(container);
}
上面使用了IOC容器Autofac。
其次，配置认证中间件:
/// <summary>
///
/// </summary>
/// <param name="app"></param>
/// <param name="env"></param>
public void Configure(IApplicationBuilder app, IHostingEnvironment env)
{
if (env.IsDevelopment())
{
app.UseDeveloperExceptionPage();
}
app.UseAuthentication();//配置授权
//处理异常
app.UseStatusCodePages(new StatusCodePagesOptions()
{
HandleAsync = (context) =>
{
if (context.HttpContext.Response.StatusCode == 401)
{
using (System.IO.StreamWriter sw = new System.IO.StreamWriter(context.HttpContext.Response.Body))
{
sw.Write(Newtonsoft.Json.JsonConvert.SerializeObject(new
{
status = 401,
message = "access denied!",
}));
}
}
return System.Threading.Tasks.Task.Delay(0);
}
});
app.UseMvc(routes =>
{
routes.MapRoute(name: "default", template: "api/{controller=Home}/{action=Index}/{id?}");
routes.MapRoute(name: "mvc", template: "{controller=Home}/{action=Index}/{id?}");
});
}
为了测试，我们给ValuesController控制器添加Authorize特性。
/// <summary>
///
/// </summary>
[Authorize]
[Route("api/[controller]")]
public class ValuesController : Controller
{ // GET api/values
[HttpGet]
public IEnumerable<string> Get()
{
return new string[] { "value1", "value2" };
}
}
最后，让我们测试下API的授权，这里，我以Ajax模拟API的调用：
script type="text/javascript">
//获取令牌
$.post("/oauth/token", $.param({ user: "lichaoqiang", password: "fdsfds" })).done(function (data) { if (data.code === 1) {
localStorage.setItem("token", data.data.accessToken);
}
}); //设置HTTP头
$.ajaxSetup({
beforeSend: function (xhr) {
if (localStorage.getItem("token") !== null) {
xhr.setRequestHeader('Authorization', 'Bearer ' + localStorage.getItem("token"));
}
}
}); $.getJSON("/api/values", function (data) { console.log(data); });//获取受保护的资源
</script>
看下效果，直接访问/api/values，会出现如下图：
当客户请求受保护的资源时，通过HTTP header携带上token。这里需要注意的是，请求头必须是Authorization，值是Bearer空格加上token。这样访问资源时，通过HTTP header携带令牌信息，服务端，通过认证中间件，完成授权认证过程。在上面的示例中，通过向全局Ajax注册事件，将token写入请求Header。、
至此，就完成了JWT认证授权的过程，.Net Core WebAPI配置起来也很简单。