Azure应用服务上的瞬态无限登录循环-使用Azure AD的OpenIDConnect Auth

时间:2019-01-15 02:30:06

标签: asp.net-mvc azure-active-directory openid-connect azure-app-service-envrmnt

背景

因此,我们有一个应用程序服务,可以使用OpenIdConnect在另一个租约中从Azure AD进行身份验证。

登录适用于IIS的开发实例,并且适用于我们的测试应用程序服务。我们在测试中看到了这个问题,它消失了,并且在项目的整个测试阶段都没有返回。

现在我们已经部署到生产环境,并且再次遇到了这个问题。

问题

我们看到的是,一段时间后一切都会正常运行,然后几个小时后,问题又会再次出现。

我们有一种解决方法,用于还原服务-即在azure控制面板中启用然后禁用应用程序服务身份验证。相反的方法也可以-禁用然后启用将还原服务。

代码

public void ConfigureAuth(IAppBuilder app)
        {
            //Azure AD Configuration
            app.SetDefaultSignInAsAuthenticationType(CookieAuthenticationDefaults.AuthenticationType);
            app.UseCookieAuthentication(new CookieAuthenticationOptions());


            app.UseOpenIdConnectAuthentication(
                new OpenIdConnectAuthenticationOptions
                {
                    //sets client ID, authority, and RedirectUri as obtained from web config
                    ClientId = clientId,
                    ClientSecret = appKey,
                    Authority = authority,
                    RedirectUri = redirectUrl,

                    CallbackPath = new PathString("/"), //use this line for production and test


                    //page that users are redirected to on logout
                    PostLogoutRedirectUri = redirectUrl,

                    //scope - the claims that the app will make
                    Scope = OpenIdConnectScope.OpenIdProfile,
                    ResponseType = OpenIdConnectResponseType.CodeIdToken,

                    //setup multi-tennant support here, or set ValidateIssuer = true to config for single tennancy
                    TokenValidationParameters = new TokenValidationParameters()
                    {
                        ValidateIssuer = true,
                        //SaveSigninToken = true
                    },
                    Notifications = new OpenIdConnectAuthenticationNotifications
                    {
                        AuthenticationFailed = OnAuthenticationFailed,
                        AuthorizationCodeReceived = OnAuthorizationCodeReceived,
                    }
                }
                );
        }

        private async Task OnAuthorizationCodeReceived(AuthorizationCodeReceivedNotification context)
        {
            var code = context.Code;
            ClientCredential cred = new ClientCredential(clientId, appKey);
            string userObjectId = context.AuthenticationTicket.Identity.FindFirst("http://schemas.microsoft.com/identity/claims/objectidentifier").Value;
            //this token cache is stateful, we're going to populate it here, but we'll store it elsewhere in-case the user ends up accessing a different instance
            AuthenticationContext authContext = new AuthenticationContext(authority, new NaiveSessionCache(userObjectId));

            // If you create the redirectUri this way, it will contain a trailing slash.  
            // Make sure you've registered the same exact Uri in the Azure Portal (including the slash).
            Uri uri = new Uri(HttpContext.Current.Request.Url.GetLeftPart(UriPartial.Path));
            AuthenticationResult result = await authContext.AcquireTokenByAuthorizationCodeAsync(code, uri, cred, "https://graph.windows.net");

            //populate the persistent token cache
            testdb2Entities5 db = new testdb2Entities5();
            PersistentTokenCache tc = await db.PersistentTokenCaches.FindAsync(userObjectId);
            //if null, populate a new item
            if (tc == null)
            {
                tc = new PersistentTokenCache();
                tc.object_id = userObjectId;
                tc.token = code;
                db.PersistentTokenCaches.Add(tc);
                await db.SaveChangesAsync();

            }
            else
            {
                tc.token = code;
                await db.SaveChangesAsync();
            }

        }

        //authentication failed notifications
        private Task OnAuthenticationFailed(AuthenticationFailedNotification<Microsoft.IdentityModel.Protocols
                                                                            .OpenIdConnect.OpenIdConnectMessage,
                                                                            OpenIdConnectAuthenticationOptions> context)
        {
            context.HandleResponse();
            context.Response.Redirect("/?errormessage=" + context.Exception.Message);
            return Task.FromResult(0);
        }

问题

因此,基于启用和禁用应用程序服务身份验证所做的一切,显然可以暂时解决问题。所以我认为这是一个与Cookie相关的问题-因为那是在会话之间转移状态的唯一方法。这到底是什么问题?我需要采取什么步骤来诊断和解决问题?

1 个答案:

答案 0 :(得分:1)

到目前为止,似乎这是Katana中一个已知错误的问题,其中Katana cookie管理器和ASP .NET cookie管理器发生冲突并覆盖彼此的cookie。

以下是一些故障排除方法,您可以参考:

1。设置  app.UseCookieAuthentication(new CookieAuthenticationOptions {CookieSecure == CookieSecureOption.Always})。这意味着cookie可能与您的身份验证一起泄漏。

2。在SystemWebCookieManager Nuget包中的UseCookieAuthentication中添加Microsoft.Owin.Host.SystemWeb。请参阅此thread

3。Split cookie。有人注意到,如果Cookie字符超过浏览器限制(> 4096),就会出现问题。因此,为解决该问题,请在每个cookie中包含大约4000个字符的set-cookie,并在需要时将所有cookie合并在一起以获取原始值。

有关如何通过Microsoft将登录信息添加到ASP.NET Web应用程序的更多详细信息,请参阅此article

更新

使用安装Kentor.OwinCookieSaver nuget包修复并在app.UseKentorOwinCookieSaver();之前添加app.UseCookieAuthentication(new CookieAuthenticationOptions());