认证授权：IdentityServer4

前言

　上一篇文章介绍了IdentityServer4的各种授权模式，本篇继续介绍使用IdentityServer4实现单点登录效果。

单点登录（SSO）

　SSO（ Single Sign-On ），中文意即单点登录，单点登录是一种控制多个相关但彼此独立的系统的访问权限，拥有这一权限的用户可以使用单一的ID和密码访问某个或多个系统从而避免使用不同的用户名或密码，或者通过某种配置无缝地登录每个系统。

　概括就是：一次登录，多处访问

案例场景：

　1、提供资源服务(WebApi)：订单：Order（cz.Api.Order）、商品：Goods（cz.Api.Goods）……

　2、业务中存在多个系统：门户系统、订单系统、商品系统……

　3、实现用户登录门户后，跳转订单系统、商品系统时，不需要登录认证（单点登录效果）

一、环境准备：

　调整项目如下图结构：

　

  在身份认证项目(cz.IdentityServer)中InMemoryConfig中客户端列表中添加以下客户端内容：（其他内容同上一篇设置相同）

new Client
{
    ClientId = "main_client",
    ClientName = "Implicit Client",
    ClientSecrets = new [] { new Secret("secret".Sha256()) },
    AllowedGrantTypes = GrantTypes.Implicit,
    RedirectUris = { "http://localhost:5020/signin-oidc" },
    PostLogoutRedirectUris = { "http://localhost:5020/signout-callback-oidc" },
    //是否显示授权提示界面
    RequireConsent = true,
    AllowedScopes = {
        IdentityServerConstants.StandardScopes.OpenId,
        IdentityServerConstants.StandardScopes.Profile
    }
},
new Client
{
    ClientId = "order_client",
    ClientName = "Order Client",
    ClientSecrets = new [] { new Secret("secret".Sha256()) },
    AllowedGrantTypes = GrantTypes.Code,
    AllowedScopes = {
        "order","goods",
        IdentityServerConstants.StandardScopes.OpenId,
        IdentityServerConstants.StandardScopes.Profile
    },
    RedirectUris = { "http://localhost:5021/signin-oidc" },
    PostLogoutRedirectUris = { "http://localhost:5021/signout-callback-oidc" },
    //是否显示授权提示界面
    RequireConsent = true,
},
new Client
{
    ClientId = "goods_client",
    ClientName = "Goods Client",
    ClientSecrets = new [] { new Secret("secret".Sha256()) },
    AllowedGrantTypes = GrantTypes.Code,
    RedirectUris = { "http://localhost:5022/signin-oidc" },
    PostLogoutRedirectUris = { "http://localhost:5022/signout-callback-oidc" },
    //是否显示授权提示界面
    RequireConsent = true,
    AllowedScopes = {
        "goods",
        IdentityServerConstants.StandardScopes.OpenId,
        IdentityServerConstants.StandardScopes.Profile
    }
}

二、程序实现：

　1、订单、商品Api项目：

　　a）订单API项目调整：添加Nuget包引用：

Install-Package IdentityServer4.AccessTokenValidation

　　b）调整Statup文件：

public class Startup
{
    public Startup(IConfiguration configuration)
    {
        Configuration = configuration;
    }

    public IConfiguration Configuration { get; }

    // This method gets called by the runtime. Use this method to add services to the container.
    public void ConfigureServices(IServiceCollection services)
    {
        services.AddControllers();

        //IdentityServer
        services.AddMvcCore()
                .AddAuthorization();

        //配置IdentityServer
        services.AddAuthentication("Bearer")
                .AddIdentityServerAuthentication(options =>
                {
                    options.RequireHttpsMetadata = false; //是否需要https
                    options.Authority = $"http://localhost:5600";  //IdentityServer授权路径
                    options.ApiName = "order";  //需要授权的服务名称
                });
    }

    // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
    public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
    {
        if (env.IsDevelopment())
        {
            app.UseDeveloperExceptionPage();
        }

        app.UseRouting();

        app.UseAuthentication();

        app.UseAuthorization();

        app.UseEndpoints(endpoints =>
        {
            endpoints.MapControllers();
        });
    }
}

　　c）添加控制器：OrderController 

namespace cz.Api.Order.Controllers
{
   [ApiController]
   [Route("[controller]")]
　  [Authorize]    
　　public class OrderController : ControllerBase
    {
        private static readonly string[] Summaries = new[]
        {
            "Order1", "Order2", "Order3", "Order4", "Order5", "Order6", "Order7", "Order8", "Order9", "Order10"
        };

        private readonly ILogger<OrderController> _logger;

        public OrderController(ILogger<OrderController> logger)
        {
            _logger = logger;
        }
　　　　　//模拟返回数据
        [HttpGet]
        public IEnumerable<WeatherForecast> Get()
        {
            var rng = new Random();
            return Enumerable.Range(1, 5).Select(index => new WeatherForecast
            {
                Date = DateTime.Now.AddDays(index),
                TemperatureC = rng.Next(-20, 55),
                Summary = Summaries[rng.Next(Summaries.Length)]
            })
            .ToArray();
        }
    }
}

　　d）商品项目同步调整，调整Api和方法

　2、门户项目：

　　添加Nuget引用：

Install-Package IdentityServer4.AccessTokenValidation

Install-Package Microsoft.AspNetCore.Authentication.OpenIdConnect

　　a）调整HomeController如下内容：

public class HomeController : Controller
{
    private readonly ILogger<HomeController> _logger;

    public HomeController(ILogger<HomeController> logger)
    {
        _logger = logger;
    }
    [Authorize]
    public IActionResult Index()
    {
        //模拟返回应用列表
        List<AppModel> apps = new List<AppModel>();
        apps.Add(new AppModel() { AppName = "Order Client", Url = "http://localhost:5021" });
        apps.Add(new AppModel() { AppName = "Goods Client", Url = "http://localhost:5022" });
        return View(apps);
    }

    [Authorize]
    public IActionResult Privacy()
    {
        return View();
    }
public IActionResult Logout()
    {
        return SignOut("oidc", "Cookies");
    }

}

　　b）调整主页视图：　

@model List<AppModel>
@{
    ViewData["Title"] = "Home Page";
}
<style>
    .box-wrap {
        text-align: center;
        /*        background-color: #d4d4f5;*/
        overflow: hidden;
    }

        .box-wrap > div {
             31%;
            padding-bottom: 31%;
            margin: 1%;
            border-radius: 10%;
            float: left;
            background-color: #36A1DB;
        }
</style>
<div class="text-center">
    <div class="box-wrap">
        @foreach (var item in Model)
        {
            <div class="box">
                <a href="@item.Url" target="_blank">@item.AppName</a>
            </div>
        }
    </div>
</div>

　　c）调整Statup文件中ConfigureServices方法：　　　　

public void ConfigureServices(IServiceCollection services)
{
    services.Configure<CookiePolicyOptions>(options =>
    {
        // This lambda determines whether user consent for non-essential cookies is needed for a given request.
        options.CheckConsentNeeded = context => true;
        options.MinimumSameSitePolicy = SameSiteMode.Lax;
    });
    JwtSecurityTokenHandler.DefaultMapInboundClaims = false;
    services.AddControllersWithViews();
    services.AddAuthentication(options =>
    {
        options.DefaultScheme = "Cookies";
        options.DefaultChallengeScheme = "oidc";
    })
    .AddCookie("Cookies")
    .AddOpenIdConnect("oidc", options =>
    {
        options.RequireHttpsMetadata = false;
        options.Authority = "http://localhost:5600";
        options.ClientId = "main_client";
        options.ClientSecret = "secret";
        options.ResponseType = "id_token";
        options.SaveTokens = true;
        options.GetClaimsFromUserInfoEndpoint = true;
        //事件
        options.Events = new Microsoft.AspNetCore.Authentication.OpenIdConnect.OpenIdConnectEvents()
        {
            //远程故障
            OnRemoteFailure = context =>
            {
                context.Response.Redirect("/");
                context.HandleResponse();
                return Task.FromResult(0);
            },
            //访问拒绝
            OnAccessDenied = context =>
            {
                //重定向到指定页面
                context.Response.Redirect("/");
                //停止此请求的所有处理并返回给客户端
                context.HandleResponse();
                return Task.FromResult(0);
            },
        };
    });
}

　3、订单、商品客户端项目：

　　添加Nuget引用：

Install-Package IdentityServer4.AccessTokenValidation

Install-Package Microsoft.AspNetCore.Authentication.OpenIdConnect

　　a）修改HomeController内容如下：

public class HomeController : Controller
{
    private readonly ILogger<HomeController> _logger;

    public HomeController(ILogger<HomeController> logger)
    {
        _logger = logger;
    }

    [Authorize]
    public IActionResult Index()
    {
        return View();
    }

    public async Task<IActionResult> PrivacyAsync()
    {
        var accessToken = await HttpContext.GetTokenAsync("access_token");
        var client = new HttpClient();
        client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", accessToken);
        var content = await client.GetStringAsync("http://localhost:5601/order");

        client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", accessToken);
        var contentgoods = await client.GetStringAsync("http://localhost:5602/goods");

        ViewData["Json"] = $"Goods：{contentgoods}
 " +
            $"Orders：{content}";
        return View();
    }

    [ResponseCache(Duration = 0, Location = ResponseCacheLocation.None, NoStore = true)]
    public IActionResult Error()
    {
        return View(new ErrorViewModel { RequestId = Activity.Current?.Id ?? HttpContext.TraceIdentifier });
    }
    public IActionResult Logout()
    {
        return SignOut("oidc", "Cookies");
    }
}

　　b）调整对应视图内容：

#####Home.cshtml

@{
    ViewData["Title"] = "Home Page";
}
@using Microsoft.AspNetCore.Authentication

<h2>Claims</h2>
<div class="text-center">
    <dl>
        @foreach (var claim in User.Claims)
        {
            <dt>@claim.Type</dt>
            <dd>@claim.Value</dd>
        }
    </dl>
</div>
<div class="text-center">
    <h2>Properties</h2>
    <dl>
        @foreach (var prop in (await Context.AuthenticateAsync()).Properties.Items)
        {
            <dt>@prop.Key</dt>
            <dd>@prop.Value</dd>
        }
    </dl>
</div>

#####Privacy.cshtml

@{
ViewData["Title"] = "API Result";
}
<h1>@ViewData["Title"]</h1>

<p>@ViewData["Json"]</p>

　　c）Statup中设置客户端信息　　

public void ConfigureServices(IServiceCollection services)
{
    services.Configure<CookiePolicyOptions>(options =>
    {
        // This lambda determines whether user consent for non-essential cookies is needed for a given request.
        options.CheckConsentNeeded = context => true;
        options.MinimumSameSitePolicy = SameSiteMode.Lax;
    });
    JwtSecurityTokenHandler.DefaultMapInboundClaims = false;
    services.AddControllersWithViews();
    services.AddAuthentication(options =>
    {
        options.DefaultScheme = "Cookies";
        options.DefaultChallengeScheme = "oidc";
    })
    .AddCookie("Cookies")
    .AddOpenIdConnect("oidc", options =>
    {
        options.RequireHttpsMetadata = false;
        options.Authority = "http://localhost:5600";
        options.ClientId = "order_client";
        options.ClientSecret = "secret";
        options.ResponseType = "code";
        options.SaveTokens = true;
        options.Scope.Add("order");
        options.Scope.Add("goods");
        options.GetClaimsFromUserInfoEndpoint = true;
        //事件
        options.Events = new Microsoft.AspNetCore.Authentication.OpenIdConnect.OpenIdConnectEvents()
        {
            //远程故障
            OnRemoteFailure = context =>
            {
                context.Response.Redirect("/");
                context.HandleResponse();
                return Task.FromResult(0);
            },
            //访问拒绝
            OnAccessDenied = context =>
            {
                //重定向到指定页面
                context.Response.Redirect("/");
                //停止此请求的所有处理并返回给客户端
                context.HandleResponse();
                return Task.FromResult(0);
            },
        };
    });
}

　d）商品客户端调整按照以上内容调整类似。

三、演示效果：

　　　1、设置项目启动如下图：

 　　 2、示例效果：

　　　

四、总结：

　　通过以上操作，整理单点登录流程如下图：

　　　　

　　踩坑：当登录取消、授权提示拒绝时，总是跳转错误界面。

　　　　解决办法：客户端定义时，定义事件：对访问拒绝添加处理逻辑。

//事件
options.Events = new Microsoft.AspNetCore.Authentication.OpenIdConnect.OpenIdConnectEvents()
{
　　//远程故障
　　OnRemoteFailure = context =>
　　{
　　　　context.Response.Redirect("/");
　　　　context.HandleResponse();
　　　　return Task.FromResult(0);
　　},
　　//访问拒绝
　　OnAccessDenied = context =>
　　{
　　　　//重定向到指定页面
　　　　context.Response.Redirect("/");
　　　　//停止此请求的所有处理并返回给客户端
　　　　context.HandleResponse();
　　　　return Task.FromResult(0);
　　},
};

GitHub地址：https://github.com/cwsheng/IdentityServer.Demo.git