Configuring a Website that Uses Application Services (VB)
ASP.NET version 2.0 introduced a series
of application services, which are part of the .NET Framework
and serve as a suite of building block services that you can use to
add rich functionality to your web application. The application services
- Membership - an API for creating and managing user accounts.
- Roles - an API for categorizing users into groups.
- Profile - an API for storing custom, user-specific content.
- Site Map - an API for defining a site s logical structure in the form of a hierarchy, which can then be displayed via navigation controls, such as menus and breadcrumbs.
- Personalization - an API for maintaining customization preferences, most often used with WebParts.
- Health Monitoring - an API for monitoring performance, security, errors, and other system health metrics for a running web application.
The application services APIs are not
tied to a specific implementation. Instead, you instruct the application
services to use a particular provider, and that provider implements
the service using a particular technology. The most commonly used providers
for Internet-based web applications hosted at a web hosting company
are those providers that use a SQL Server database implementation. For
SqlMembershipProvider is a provider for the Membership API that
stores user account information in a Microsoft SQL Server database.
Using the application services and
SQL Server providers adds some challenges when deploying the application.
For starters, the application services database objects must be properly
created on both the development and production databases and appropriately
initialized. There are also important configuration settings that need
to be made.
Note: The application
services APIs were designed using the provider
model, a design pattern
that allows for an API s implementation details to be provided at runtime.
The .NET Framework ships with a number of application service providers
that can be used, such as the
SqlRoleProvider, which are providers for the Membership and
Roles APIs that use a SQL Server database implementation. You can also
create and plug-in a custom provider. In fact, the Book Reviews web
application already contains a custom provider for the Site Map API
ReviewSiteMapProvider), which constructs the site map from the data
tables in the database.
This tutorial starts with a look at
how I extended the Book Reviews web application to use the Membership
and Roles APIs. It then walks through deploying a web application that
uses application services with a SQL Server database implementation,
and concludes by addressing common issues with managing user accounts
and roles on the production environment.
Updates to the Book Reviews Application
Over the past couple tutorials the
Book Reviews web application was updated from a static website to a
dynamic, data-driven web application complete with a set of administration
pages for managing genres and reviews. However, this administration
section is currently not protected - any user who knows (or guesses)
the administration page URL can waltz in and create, edit, or delete
reviews on our site. A common way to protect certain portions of a website
is to implement user accounts and then use URL authorization rules to
restrict access to certain users or roles. The Book Reviews web application
available for download with this tutorial supports user accounts and
roles. It has a single role defined named Admin and only users in this
role can access the administration pages.
I ve created three user accounts in the Book Reviews web application:
Scott, Jisun, and Alice. All three users have the same password:
password! Scott and Jisun are in the Admin role, Alice is not. The
site s non-administration pages are still accessible to anonymous users.
That is, you do not need to sign in to visit the site, unless you want
to administer it, in which case you must sign in as a user in the Admin
The Book Reviews application s master
page has been updated to include a different user interface for authenticated
and anonymous users. If an anonymous user visits the site she sees a
Login link in the upper right corner. An authenticated user sees the
message, "Welcome back, username!" and a link to log
out. There s also a login page (
~/Login.aspx), which contains a Login Web control that
provides the user interface and logic for authenticating a visitor.
Only administrators can create new accounts. (There are pages for creating
and managing user accounts in the
Configuring the Membership and Roles APIs
The Book Reviews web application uses
the Membership and Roles APIs to support user accounts and to group
those users into roles (namely, the Admin role). The
SqlRoleProvider provider classes are used because we want
to store account and role information in a SQL Server database.
This tutorial is not intended to be a detailed examination at configuring
a web application to support the Membership and Roles APIs. For a thorough
look at these APIs and the steps you need to take to configure a website
to use them, please read my Website
To use the application services with
a SQL Server database you must first add the database objects used by
these providers to the database where you want the user account and
role information stored. These requisite database objects include a
variety of tables, views, and stored procedures. Unless specified otherwise,
SqlRoleProvider provider classes use a SQL Server Express
Edition database named
ASPNETDB located in the application s
App_Data folder; if such a database does not exist,
it is automatically created with the necessary database objects by these
providers at runtime.
It is possible, and usually ideal,
to create the application services database objects in the same database
where the website s application-specific data is stored. The .NET Framework
ships with a tool named
aspnet_regsql.exe that installs the database objects on a specified
database. I have gone ahead and used this tool to add these objects
Reviews.mdf database in the
App_Data folder (the development database). We ll see
how to use this tool later in this tutorial when we add these objects
to the production database.
If you add the application services
database objects to a database other than
ASPNETDB you will need to customize the
SqlRoleProvider provider classes configurations so that they
use the appropriate database. To customize the Membership provider add
a <membership> element within the
<system.web> section in
Web.config; use the <roleManager> element to configure the Roles provider. The following
snippet is taken from the Book Reviews application s
Web.config and shows the configure settings for the Membership
and Roles APIs. Note that both register a new provider -
- that use the
SqlRoleProvider providers, respectively.
<configuration> <system.web> ... <membership defaultProvider="ReviewMembership"> <providers> <clear /> <add type="System.Web.Security.SqlMembershipProvider" name="ReviewMembership" connectionStringName="ReviewsConnectionString" applicationName="BookReviews" /> </providers> </membership> <roleManager enabled="true" defaultProvider="ReviewRole"> <providers> <clear /> <add type="System.Web.Security.SqlRoleProvider" name="ReviewRole" connectionStringName="ReviewsConnectionString" applicationName="BookReviews" /> </providers> </roleManager> ... </system.web> </configuration>
Web.config file s
<authentication> element has also been configured to support
<configuration> <system.web> ... <authentication mode="Forms" /> ... </system.web> </configuration>
Limiting Access to the Administration Pages
ASP.NET makes it easy to grant or deny
access to a particular file or folder by user or by role via its
URL authorization feature. (We briefly discussed URL authorization
in the Core Differences Between IIS and the ASP.NET Development Server
tutorial and showed how IIS and the ASP.NET Development Server apply
URL authorization rules differently for static versus dynamic content.)
Because we want to prohibit access to the
~/Admin folder except for those users in the Admin
role, we need to add URL authorization rules to this folder. Specifically,
the URL authorization rules need to allow users in the Admin role and
deny all other users. This is accomplished by adding a
Web.config file to the
~/Admin folder with the following contents:
<?xml version="1.0"?> <configuration> <system.web> <authorization> <allow roles="Admin" /> <deny users="*" /> </authorization> </system.web> </configuration>
For more information on ASP.NET s URL
authorization feature and how to use it to spell out authorization rules
for users and for roles, be sure to read the User-Based Authorization and Role-Based
from my Website
Deploying a Web Application That Uses Application Services
When deploying a website that uses
application services and a provider that stores the application services
information in a database, it is imperative that the database objects
needed by the application services be created on the production database.
Initially the production database does not contain these objects, so
when the application is first deployed (or when it is deployed for the
first time after application services have been added), you must take
extra steps to get these requisite database objects on the production
Another challenge can arise when deploying
a website that uses application services if you intend to replicate
the user accounts created in the development environment to the production
environment. Depending on the Membership and Roles configuration, it
is possible that even if you successfully copy the user accounts that
were created in the development environment to the production database,
these users cannot sign into the web application in production. We ll
look at the cause of this issue and discuss how to prevent it from happening.
ASP.NET ships with a nice Web Site Administration Tool (WSAT) that can be launched from Visual Studio and allows the user account, roles, and authorization rules to be managed through a web-based interface. Unfortunately, the WSAT only works for local websites, meaning that it cannot be used to remotely manage user accounts, roles, and authorization rules for the web application in the production environment. We ll look at different ways to implement WSAT-like behavior from your production website.
Adding the Database Objects Using aspnet_regsql.exe
The Deploying a Database tutorial
showed how to copy the tables and data from the development database
to the production database, and these techniques can certainly be used
to copy the application services database objects to the production
database. Another option is the
aspnet_regsql.exe tool, which adds or removes the application
services database objects from a database.
tool creates the database objects on a specified database. It does not
migrate data in those database objects from the development database
to the production database. If you mean to copy the user account and
role information in the development database to the production database
use the techniques covered in the Deploying a Database tutorial.
Let s look at how to add the database
objects to the production database using the
aspnet_regsql.exe tool. Start by opening Windows Explorer and
navigating to the .NET Framework version 2.0 directory on your computer, %WINDIR%\ Microsoft.NET\Framework\v2.0.
aspnet_regsql.exe tool. This tool can be used from the command-line,
but it also includes a graphical user interface; double-click the
file to launch its graphical component.
The tool starts by displaying a splash screen explaining its purpose. Click Next to advance to the "Select a Setup Option" screen, which is shown in Figure 1. From here you can choose to add the application services database objects or remove them from a database. Because we want to add these objects to the production database, select the "Configure SQL Server for application services" option and click Next.
In "Select the Server and Database"
screen prompts for information to connect to the database. Enter the
database server, the security credentials, and the database name supplied
to you by your web hosting company and click Next.
Note: After entering
your database server and credentials you may get an error when expanding
the database drop-down list. The
aspnet_regsql.exe tool queries the
sysdatabases system table to retrieve a list of databases
on the server, but some web hosting companies lock down their database
servers so that this information is not publicly available. If you get
this error you can type the database name directly into the drop-down
The subsequent screen summarizes the actions that are about to take place, namely that the application services database objects are going to be added to the specified database. Click Next to complete this action. After a few moments, the final screen is displayed, noting that the database objects have been added (see Figure 3).
To verify that the application services
database objects were successfully added to the production database,
open SQL Server Management Studio and connect to your production database.
As Figure 4 shows, you should now see the application services database
tables in your database,
aspnet_Users, and so forth.
You will only need to use the
tool when deploying your web application for the first time or for the
first time after you have started using the application services. Once
these database objects are on the production database they won t need
to be re-added or modified.
Copying User Accounts from Development to Production
When using the
SqlRoleProvider provider classes to store the application
services information in a SQL Server database, the user account and
role information is stored in a variety of database tables, including
aspnet_UsersInRoles, among others. If during development you create
user accounts in the development environment you can replicate those
user accounts in production by copying the corresponding records from
the applicable database tables. If you used the Database Publishing
Wizard to deploy the application services database objects you may have
also elected to copy the records, which would result in the user accounts
created in development to also be on production. But, depending on your
configuration settings, you may find that those users whose accounts
were created in development and copied to production are unable to login
from the production website. What gives?
SqlRoleProvider provider classes were designed such that a
single database could serve as a user store for multiple applications,
where each application could, in theory, have users with overlapping
usernames and roles with the same name. To allow for this flexibility,
the database maintains a list of applications in the
aspnet_Applications table, and each user is associated with one
of these applications. Specifically, the
aspnet_Users table has an
ApplicationId column that ties each user to a record in
In addition to the
ApplicationId column, the
aspnet_Applications table also includes an
ApplicationName column, which provides a more human-friendly
name for the application. When a website attempts to work with a user
account, such as validating a user s credentials from the login page,
it must tell the
SqlMembershipProvider class what application to work with. It usually
does this by supplying the application name, and the this value comes
from the provider s configuration in
Web.config - specifically via the
But what happens if the
attribute is not specified in
Web.config? In such a case the Membership system uses
the application root path as the
applicationName value. If the
applicationName attribute is not explicitly set in
then, there is the possibility that the development environment and
production environment use a different application root and therefore
will be associated with different application names in the application
services. If such a mismatch occurs then those users created in the
development environment will have an
ApplicationId value that does not match with the
value for the production environment. The net result is that those users
won t be able to login.
Note: If you find
yourself in this situation - with user accounts copied to production
with a mismatched
ApplicationId value - you could write a query to update
ApplicationId values to the
ApplicationId used on production. Once updated, the users
whose accounts were created on the development environment would now
be able to sign into the web application on production.
The good news is that there is a simple
step you can take to ensure that the two environments use the same
- explicitly set the
applicationName attribute in
Web.config for all of your application services providers.
I explicitly set the
applicationName attribute to "BookReviews" in the
<roleManager> elements as this snippet from
<membership defaultProvider="ReviewMembership"> <providers> <clear /> <add type="System.Web.Security.SqlMembershipProvider" name="ReviewMembership" connectionStringName="ReviewsConnectionString" applicationName="BookReviews" /> </providers> </membership>
For more discussion on setting the
attribute and the rationale behind it, refer to Scott Guthrie s blog post, Always
set the applicationName property when configuring
ASP.NET Membership and other Providers.
Managing User Accounts in the Production Environment
The ASP.NET Web Site Administration
Tool (WSAT) makes it easy to create and manage user accounts, define
and apply roles, and spell out user- and role-based authorization rules.
You can launch the WSAT from Visual Studio by going to the Solution
Explorer and clicking the ASP.NET Configuration icon or by going to
the Website or Project menus and selecting the ASP.NET Configuration
menu item. Unfortunately, the WSAT can only work with local websites.
Therefore, you cannot use the WSAT from your workstation to manage the
website in the production environment.
The good news is that all of the functionality
exposed provided by the WSAT is available programmatically through the
Membership and Roles APIs; furthermore, many of the WSAT screens use
the standard ASP.NET Login-related controls. In short, you can add ASP.NET
pages to your website that offer the necessary management capabilities.
Recall that an earlier tutorial updated
the Book Reviews web application to include an
~/Admin folder, and this folder has been configured
to only allow users in the Admin role. I added a page to that folder
CreateAccount.aspx from which an administrator can create a new
user account. This page uses the CreateUserWizard control to display
the user interface and backend logic for creating a new user account.
What s more, I customized the control to include a CheckBox that prompts
whether the new user should also be added to the Admin role (see Figure
5). With a little bit of work you can build a custom set of pages that
implements the user and role management-related tasks that would otherwise
be provided by the WSAT.
Note: For more information on using the Membership and Roles APIs along with the Login-related ASP.NET Web controls, be sure to read my Website Security Tutorials. For more on customizing the CreateUserWizard control refer to the Creating User Accounts and Storing Additional User Information tutorials, or check out Erich Peterson s article, Customizing the CreateUserWizard Control.
If you need the full functionality
of the WSAT check out Rolling
Your Own Web Site Administration Tool,
in which author Dan Clem walks through the process of building a custom
WSAT-like tool. Dan shares his application s source code (in C#) and
provides step-by-step instructions for adding it to your hosted website.
When deploying a web application that
uses the application services database implementation you must first
ensure that the production database has the requisite database objects.
These objects can be added using the techniques discussed in the
Deploying a Database tutorial; alternatively, you can use the
tool, as we saw in this tutorial. Other challenges we touched on center
around synchronizing the application name used in the development and
production environments (which is important if you want users and roles
created in the development environment to be valid on production) and
techniques for managing the users and roles in the production environment.
For more information on the topics
discussed in this tutorial, refer to the following resources:
- ASP.NET SQL Server Registration Tool (aspnet_regsql.exe)
- Creating the Application Services Database for SQL Server
- Creating the Membership Schema in SQL Server
- Examining ASP.NET s Membership, Roles, and Profile
- Rolling Your Own Web Site Administration Tool
- Website Security Tutorials
- Web Site Administration Tool Overview