ASP.NET MVC SSO单点登录设计与实现（转载）

实验环境配置

HOST文件配置如下：

127.0.0.1 app.com
127.0.0.1 sso.com

IIS配置如下：

应用程序池采用.Net Framework 4.0

注意IIS绑定的域名，两个完全不同域的域名。

app.com网站配置如下：

sso.com网站配置如下：

memcached缓存：

数据库配置：

数据库采用EntityFramework 6.0.0，首次运行会自动创建相应的数据库和表结构。

授权验证过程演示：

在浏览器地址栏中访问：http://app.com，如果用户还未登陆则网站会自动重定向至：http://sso.com/passport，同时通过QueryString传参数的方式将对应的AppKey应用标识传递过来，运行截图如下：

URL地址：http://sso.com/passport?appkey=670b14728ad9902aecba32e22fa4f6bd&username=

输入正确的登陆账号和密码后，点击登陆按钮系统自动301重定向至应用会掉首页，毁掉成功后如下所示：

由于在不同的域下进行SSO授权登陆，所以采用QueryString方式返回授权标识。同域网站下可采用Cookie方式。由于301重定向请求是由浏览器发送的，所以在如果授权标识放入Handers中的话，浏览器重定向的时候会丢失。重定向成功后，程序自动将授权标识写入到Cookie中，点击其他页面地址时，URL地址栏中将不再会看到授权标示信息。Cookie设置如下：

 

登陆成功后的后续授权验证（访问其他需要授权访问的页面）：

校验地址：http://sso.com/api/passport?sessionkey=xxxxxx&remark=xxxxxx

返回结果：true，false

客户端可以根据实际业务情况，选择提示用户授权已丢失，需要重新获得授权。默认自动重定向至SSO登陆页面，即：http://sso.com/passport?appkey=670b14728ad9902aecba32e22fa4f6bd&username=seo@ljja.cn 同时登陆页面邮箱地址文本框会自定补全用户的登陆账号，用户只需输入登陆密码即可，授权成功后会话有效期自动延长一年时间。

SSO数据库验证日志：

用户授权验证日志：

用户授权会话Session：

数据库用户账号和应用信息：

应用授权登陆验证页面核心代码：

  1 /// <summary>
  2     ///  公钥：AppKey
  3     ///  私钥：AppSecret
  4     ///  会话：SessionKey
  5     /// </summary>
  6     public class PassportController : Controller
  7     {
  8         private readonly IAppInfoService _appInfoService = new AppInfoService();
  9         private readonly IAppUserService _appUserService = new AppUserService();
 10         private readonly IUserAuthSessionService _authSessionService = new UserAuthSessionService();
 11         private readonly IUserAuthOperateService _userAuthOperateService = new UserAuthOperateService();
 12
 13         private const string AppInfo = "AppInfo";
 14         private const string SessionKey = "SessionKey";
 15         private const string SessionUserName = "SessionUserName";
 16
 17         //默认登录界面
 18         public ActionResult Index(string appKey = "", string username = "")
 19         {
 20             TempData[AppInfo] = _appInfoService.Get(appKey);
 21
 22             var viewModel = new PassportLoginRequest
 23             {
 24                 AppKey = appKey,
 25                 UserName = username
 26             };
 27
 28             return View(viewModel);
 29         }
 30
 31         //授权登录
 32         [HttpPost]
 33         public ActionResult Index(PassportLoginRequest model)
 34         {
 35             //获取应用信息
 36             var appInfo = _appInfoService.Get(model.AppKey);
 37             if (appInfo == null)
 38             {
 39                 //应用不存在
 40                 return View(model);
 41             }
 42
 43             TempData[AppInfo] = appInfo;
 44
 45             if (ModelState.IsValid == false)
 46             {
 47                 //实体验证失败
 48                 return View(model);
 49             }
 50
 51             //过滤字段无效字符
 52             model.Trim();
 53
 54             //获取用户信息
 55             var userInfo = _appUserService.Get(model.UserName);
 56             if (userInfo == null)
 57             {
 58                 //用户不存在
 59                 return View(model);
 60             }
 61
 62             if (userInfo.UserPwd != model.Password.ToMd5())
 63             {
 64                 //密码不正确
 65                 return View(model);
 66             }
 67
 68             //获取当前未到期的Session
 69             var currentSession = _authSessionService.ExistsByValid(appInfo.AppKey, userInfo.UserName);
 70             if (currentSession == null)
 71             {
 72                 //构建Session
 73                 currentSession = new UserAuthSession
 74                 {
 75                     AppKey = appInfo.AppKey,
 76                     CreateTime = DateTime.Now,
 77                     InvalidTime = DateTime.Now.AddYears(1),
 78                     IpAddress = Request.UserHostAddress,
 79                     SessionKey = Guid.NewGuid().ToString().ToMd5(),
 80                     UserName = userInfo.UserName
 81                 };
 82
 83                 //创建Session
 84                 _authSessionService.Create(currentSession);
 85             }
 86             else
 87             {
 88                 //延长有效期，默认一年
 89                 _authSessionService.ExtendValid(currentSession.SessionKey);
 90             }
 91
 92             //记录用户授权日志
 93             _userAuthOperateService.Create(new UserAuthOperate
 94             {
 95                 CreateTime = DateTime.Now,
 96                 IpAddress = Request.UserHostAddress,
 97                 Remark = string.Format("{0} 登录 {1} 授权成功", currentSession.UserName, appInfo.Title),
 98                 SessionKey = currentSession.SessionKey
 99             }); 104
105             var redirectUrl = string.Format("{0}?SessionKey={1}&SessionUserName={2}",
106                 appInfo.ReturnUrl,
107                 currentSession.SessionKey,
108                 userInfo.UserName);
109
110             //跳转默认回调页面
111             return Redirect(redirectUrl);
112         }
113     }

Memcached会话标识验证核心代码：

public class PassportController : ApiController
    {
        private readonly IUserAuthSessionService _authSessionService = new UserAuthSessionService();
        private readonly IUserAuthOperateService _userAuthOperateService = new UserAuthOperateService();

        public bool Get(string sessionKey = "", string remark = "")
        {
            if (_authSessionService.GetCache(sessionKey))
            {
                _userAuthOperateService.Create(new UserAuthOperate
                {
                    CreateTime = DateTime.Now,
                    IpAddress = Request.RequestUri.Host,
                    Remark = string.Format("验证成功-{0}", remark),
                    SessionKey = sessionKey
                });

                return true;
            }

            _userAuthOperateService.Create(new UserAuthOperate
            {
                CreateTime = DateTime.Now,
                IpAddress = Request.RequestUri.Host,
                Remark = string.Format("验证失败-{0}", remark),
                SessionKey = sessionKey
            });

            return false;
        }
    }

 

Client授权验证Filters Attribute

public class SSOAuthAttribute : ActionFilterAttribute
    {
        public const string SessionKey = "SessionKey";
        public const string SessionUserName = "SessionUserName";

        public override void OnActionExecuting(ActionExecutingContext filterContext)
        {
            var cookieSessionkey = "";
            var cookieSessionUserName = "";

            //SessionKey by QueryString
            if (filterContext.HttpContext.Request.QueryString[SessionKey] != null)
            {
                cookieSessionkey = filterContext.HttpContext.Request.QueryString[SessionKey];
                filterContext.HttpContext.Response.Cookies.Add(new HttpCookie(SessionKey, cookieSessionkey));
            }

            //SessionUserName by QueryString
            if (filterContext.HttpContext.Request.QueryString[SessionUserName] != null)
            {
                cookieSessionUserName = filterContext.HttpContext.Request.QueryString[SessionUserName];
                filterContext.HttpContext.Response.Cookies.Add(new HttpCookie(SessionUserName, cookieSessionUserName));
            }

            //从Cookie读取SessionKey
            if (filterContext.HttpContext.Request.Cookies[SessionKey] != null)
            {
                cookieSessionkey = filterContext.HttpContext.Request.Cookies[SessionKey].Value;
            }

            //从Cookie读取SessionUserName
            if (filterContext.HttpContext.Request.Cookies[SessionUserName] != null)
            {
                cookieSessionUserName = filterContext.HttpContext.Request.Cookies[SessionUserName].Value;
            }

            if (string.IsNullOrEmpty(cookieSessionkey) || string.IsNullOrEmpty(cookieSessionUserName))
            {
                //直接登录
                filterContext.Result = SsoLoginResult(cookieSessionUserName);
            }
            else
            {
                //验证
                if (CheckLogin(cookieSessionkey, filterContext.HttpContext.Request.RawUrl) == false)
                {
                    //会话丢失，跳转到登录页面
                    filterContext.Result = SsoLoginResult(cookieSessionUserName);
                }
            }

            base.OnActionExecuting(filterContext);
        }

        public static bool CheckLogin(string sessionKey, string remark = "")
        {
            var httpClient = new HttpClient
            {
                BaseAddress = new Uri(ConfigurationManager.AppSettings["SSOPassport"])
            };

            var requestUri = string.Format("api/Passport?sessionKey={0}&remark={1}", sessionKey, remark);

            try
            {
                var resp = httpClient.GetAsync(requestUri).Result;

                resp.EnsureSuccessStatusCode();

                return resp.Content.ReadAsAsync<bool>().Result;
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }

        private static ActionResult SsoLoginResult(string username)
        {
            return new RedirectResult(string.Format("{0}/passport?appkey={1}&username={2}",
                    ConfigurationManager.AppSettings["SSOPassport"],
                    ConfigurationManager.AppSettings["SSOAppKey"],
                    username));
        }
    }

示例SSO验证特性使用方法：

[SSOAuth]
    public class HomeController : Controller
    {
        public ActionResult Index()
        {
            return View();
        }

        public ActionResult About()
        {
            ViewBag.Message = "Your application description page.";

            return View();
        }

        public ActionResult Contact()
        {
            ViewBag.Message = "Your contact page.";

            return View();
        }
    }

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