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IIS 7.0 : Managing Configuration Extensions

6/30/2012 3:18:06 PM
Configuration extensions are extensions to the configuration system. The configuration system is at the core of the IIS 7.0 administration stack. Its primary purpose is to provide an interface to reading and writing IIS configuration, which is consumed by Web server run time and modules, and which is managed through the tools and APIs in the administration stack. The configuration data itself is stored in a hierarchy of XML files and is broken up into units called configuration sections.

Each configuration section is an XML element that can contain attributes, subelements, and collections of child elements that describe the configuration data for the section. This data can be specified at multiple locations in the configuration file hierarchy to specify configuration settings for a particular configuration path. For example, the following configuration for the <defaultDocument> section placed in an application’s Web.config file adds Index.php as an eligible default document and enables the default document feature for that application:

<configuration>
    <system.webServer>
        <defaultDocument enabled="true">
            <files>
                <add value="index.php" />
            </files>
        </defaultDocument>
    </system.webServer>
</configuration>

Typically, each Web server module has its own section, and the Web server core itself defines a number of sections such the <sites>, <applicationPools>, and <serverRuntime> sections. The configuration section is the basic unit of extensibility for the configuration system, giving custom Web server features the ability to provide their own configuration sections in the same way that IIS 7.0 features do.

Unlike the ASP.NET configuration system, which relies on .NET classes implementing the System.Configuration.Section base class to understand the contents of each configuration section, the IIS configuration system is declarative. Each configuration section is defined by registering its schema on the server, which enables the configuration system to process the configuration data for this section. By manipulating the schema, you can add new configuration sections to the system, remove existing ones, or extend existing configuration sections to contain more functionality.

Direct from the Source: The Tale of Two Teams and Two Configuration Systems

Since its inception, the ASP.NET team has had an intertwined history with the IIS team, both in terms of people and the technology. After the release of IIS 5.1, a number of IIS team members went on to be involved with a project that aimed to rebuild the Web server entirely using .NET Framework (before they came back to work on IIS 6.0). Scott Guthrie was one of the developer interns on that project, and he later left to found ASP.NET.

In early 2004, as the ASP.NET team was in the midst of the ASP.NET 2.0 development cycle, things seemed to have come full circle. The IIS team rejoined the ASP.NET team to form the Web Platform and Tools group. One of the key reasons for this reorganization was to take advantage of the ASP.NET configuration system, which promised to unify the configuration between IIS and ASP.NET, and to provide the foundation for delegated management of IIS configuration.

Over the next year, the IIS team invested in leveraging the ASP.NET configuration system for the next generation Web server, IIS 7.0. Unfortunately, the ASP.NET configuration system proved to be too heavy a weight to be used at the IIS level, which demanded an extreme level of scalability and performance that was not expected from ASP.NET applications. However, the ability to use the same configuration files, and to specify ASP.NET and IIS configuration side by side, was too huge of a customer win to pass up. Therefore, the new IIS 7.0 configuration system was born. The team designed it from the ground up to meet the scalability demands of the IIS worker process and yet be syntactically compatible with the ASP.NET configuration system.

In addition to the configuration unification, the merging of the two teams was a great opportunity for me to drive both the core ASP.NET 2.0 infrastructure and the design of the IIS 7.0 Web server. Over the next several years, I continued to drive the design and development of both projects, which helped tremendously to deliver the ASP.NET integration in IIS 7.0 as well as key IIS 7.0 features such as URL Authorization and the Output Cache.

Mike Volodarsky

IIS Core Server Program Manager

Next, we will look at the configuration schema mechanism in detail and see how it can be used to add custom configuration sections.

Configuration Section Schema

The configuration section schema definitions are stored in XML files located in the %windir%\System32\Inetsrv\Config\Schema directory. After installation, IIS 7.0 contains the following schema files:

  • IIS_schema.xml. Defines all of the IIS configuration sections

  • ASPNET_schema.xml. Defines all of the ASP.NET configuration sections declared in Framework Root.config

  • FX_schema.xml. Defines all of the .NET Framework configuration sections declared in Machine.config

  • rscaext.xml. Defines administration extensions to the IIS <sites> and <applicationPools> configuration sections to expose run-time state information and control APIs. 

Caution

Never attempt to modify any of the built-in IIS schema files. You can add new schema to define new configuration sections and even add dynamic functionality to existing configuration sections by publishing new schema files.

These files define the schema for the configuration sections used by IIS and its features, which expect these configuration sections to be in a specific format. These files are not intended to be modified except by Windows Setup, and therefore they are protected to be writable by TrustedInstaller only. This also means that it is not necessary to back up these schema files, because they are protected and can be restored from Setup (although you should back up custom schema files).

The IIS 7.0 configuration system is not used by ASP.NET or other .NET Framework programs to read the contents of .NET Framework and ASP.NET configuration sections specified in the Framework Machine.config and root Web.config files. The .NET and ASP.NET programs use the .NET configuration system (developed by the ASP.NET team) to read that configuration. So, you may wonder why the IIS configuration system provides schema information for those configuration sections. It is to allow the rich IIS 7.0 administration stack to manage ASP.NET configuration so that Administrators can manage the entirety of server configuration with a single set of tools and APIs. Although ASP.NET provides its own API for managing .NET configuration (System.Configuration.dll), it does not support IIS configuration and does not provide the same level of tool and automation support provided by the IIS 7.0 administration stack.

However, the IIS schema files are provided for .NET Framework 2.0 only and, because of configuration changes, may not work correctly when used for other versions of .NET Framework. The IIS team may provide a versioning solution for .NET configuration schema in the future, but it is not there in IIS 7.0. Moreover, some tools in the IIS administration stack (including the Appcmd command-line tool) hardcode v2.0.50727 of the .NET Framework when working with configuration in Machine.config and root Web.config files, so they cannot be used to edit machine-level configuration for other .NET Framework versions.

Here is an example of how the <defaultDocument> configuration section for the Default Document feature is defined inside IIS_schema.xml:

<sectionSchema name="system.webServer/defaultDocument">
  <attribute name="enabled" type="bool" defaultValue="true"/>
  <element name="files">
    <collection addElement="add" clearElement="clear" removeElement="remove" mergeAppend="false">
      <attribute name="value" type="string" isUniqueKey="true"/>
    </collection>
  </element>
</sectionSchema>

The schema definition specifies each attribute and defines what child elements and element collections can be contained within the section. In addition to defining the XML structure, the schema definition also provides various metadata for attributes, child elements, and collections that control the behavior of the configuration system with respect to the section. For example, it specifies that the type of the enabled attribute is Boolean, that its default value is true, and that the value attribute of the collection element is the collection key.

The IIS_schema.xml file, arguably the main schema file, contains the description of the schema information that can be specified for each section. For each section, this information can contain the items listed in Table 1.

Table 1. Schema Elements

Schema Element

Description

<sectionSchema> element

Contains all of the schema information for a configuration section, as well as the fully qualified name (containing the section group path and the section name) for the section.

<attribute> element

Defines an attribute that can be used in the configuration section or its child elements. It specifies the name, data type, and other applicable information including default value, whether it is required, whether it should be encrypted, and validation information.

<element> element

Defines a child element, which can specify additional attributes, as well as other child elements and collections.

<collection> element

Defines a configuration collection, which can contain a list of elements that can be indexed via attributes marked as collection keys. Also supports various collection semantics such as ordered lists and hierarchical merging of elements.

Each of these elements supports a number of schema properties that control the specific behavior of the configuration system with respect to the configuration section being defined. For more details on using these properties to specify the behavior of your configuration section, refer to the comments in the IIS_Schema.xml configuration file.

Note

The schema files are local to the server. If you are using a shared configuration to host ApplicationHost.config on a network share, you must make sure that the required schema files are installed on each server that references the configuration file. Servers that do not have the required schema files will not be able to read the custom configuration sections for which they are missing the schema information. This is only needed for schema files that are not part of IIS 7.0 by default, because the latter are always installed when IIS is installed.

By including additional XML files containing section schema, you can add new configuration sections or extend existing ones to contain more configuration information or expose additional administration functionality. Before new configuration sections can be used in the configuration files, they must also be declared. We’ll look at this next.

Caution

Never attempt to delete or modify the schema files that are included with IIS 7.0 installation. Unlike the modules, most of these schema components are installed with the base IIS 7.0 installation, and their removal may break core pieces of the system that expect the configuration sections defined therein to be available. Likewise, you should not modify the schema of built-in IIS 7.0 configuration sections, because core components rely on their specific structure. This is one of the reasons these schema files have a TrustedInstaller-only access control list (ACL) that prevents modification. You can, however, add new administration extensions to existing IIS sections by adding new schema files. 

Declaring Configuration Sections

After the configuration section schema is in place, the configuration system becomes capable of processing the section’s configuration data. However, before the section can be used in the configuration file, it must also be declared somewhere in the file’s configuration file hierarchy. This is necessary to provide the Administrator with control over certain behaviors of the configuration section that cannot be easily managed if they are specified in the schema.

The declaration is performed by adding a <section> element to the built-in <configSections> configuration section. Each declaration may be nested within one or more section groups, which are essentially grouping constructs for configuration sections (however, sections cannot be nested inside one another). For example, the code that follows is the declaration of the <defaultDocument> configuration section, part of the system.webServer section group, located in ApplicationHost.config alongside the declarations of other IIS configuration sections.

Note

You can tell a bit about configuration sections by looking at the section group to which they belong. For example, IIS configuration sections that define global server configuration used by Windows Activation Service (WAS), including the <sites> and <applicationPools> configuration sections, reside in the system.applicationHost configuration section group. Web server configuration sections reside in the system.webServer section group. ASP.NET configuration sections are in the system.Web section group. When you define your own section, you can create your own section group (simply by declaring it in the configuration file) and place it in one of the existing section groups, or you can just declare your section in the top-level scope.

<configSections>
    ...
    <sectionGroup name="system.webServer">
        ...
        <section name="defaultDocument" overrideModeDefault="Allow" />
    <sectionGroup name="system.webServer">
<configSections>

This declaration indicates that the "defaultDocument" section can be used in the ApplicationHost.config file and any configuration files further down in the hierarchy. It also indicates that by default, lower configuration levels can later override the section, effectively enabling control over this section to be delegated to the application.

Important

Before editing configuration files, always back them up so that you can restore configuration if necessary. By default, the Application Host Helper Service automatically saves snapshots of server-level configuration files every two minutes, which may or may not be a sufficient level of protection for you.

To manually back up configuration before making a change, use the %windir%\System32\Inetsrv\Appcmd Add Backup <BackupName> command. To restore a backup made earlier, you can use the %windir%\System32\Inetsrv\Appcmd Restore Backup <BackupName> command. To list the backups available for restore that you made and ones made by Configuration History Service, use the %windir%\System32\Inetsrv\Appcmd List Backups command. 

Each declaration can specify the information shown in Table 2.

Table 2. Specifying Declarations

Declaration

Description

Name

The name of the configuration section. Combined with the section group path, this name must match the name of the section’s schema definition. This is required.

allowDefinition

The level at which configuration for this section is allowed, including MachineOnly, MachineToApplication, AppHostOnly, and Everywhere. This corresponds to parts of the configuration hierarchy where the configuration section can be used. Default is Everywhere.

overrideModeDefault

Whether the configuration for this section can be defined at levels below the current file where it is declared. Sections that set this to Deny effectively lock the configuration at this level, preventing its delegation. Default is Allow.

allowLocation

Whether this section can be specified for a particular path using location tags. Default is true.

type

The .NET section handler type that is responsible for processing this section. This is required for configuration sections that are read by the .NET configuration system, and therefore it is not needed for IIS configuration sections (unless you plan to access them by using the .NET configuration system). None of the IIS configuration sections define this attribute. If you declare the configuration section in the .NET Framework’s Machine.config, root Web.config, or distributed Web.config files inside your Web site directory tree, you can set this attribute to the special System.Configuration.IgnoreSection type to avoid errors from the ASP.NET configuration system.

requirePermission

Specifies whether partial trust .NET applications can read the contents of this section by using the .NET System.Configuration (ASP.NET configuration system) or Microsoft.Web.Administration (IIS configuration system) APIs. If set to false, these sections will not be readable by applications running in partial trust. Default value is true.

Though the schema definitions for configuration sections are globally defined in the %windir%\System32\Inetsrv\Config\Schema directory, the section declarations can be located at different levels of the configuration hierarchy, thereby making the section available only at that level or below. By default, IIS 7.0 configuration hierarchy declares configuration sections as follows:

  • Framework Machine.config. Declares .NET configuration sections available for all .NET programs, not just ASP.NET. All .NET programs receive configuration from this file.

  • Framework root Web.config. Declares ASP.NET-specific sections that are only available in Web applications. When reading configuration, ASP.NET programs receive merged configuration from Machine.config and this file.

  • ApplicationHost.config. Declares IIS configuration sections. When reading configuration, IIS configuration consumers receive configuration from the Framework Machine.config, root Web.config, and this file.

  • Distributed Web.config. Contains configuration settings for the site/application, and it sometimes declares application-specific configuration sections (typically ASP.NET configuration sections consumed via System.Configuration APIs).

Two other configuration files also declare configuration sections: Redirection.config and Administration.config. These files are not typically part of the configuration hierarchy for Web applications, though they are used in specific scenarios. The configuration system uses Redirection.config to redirect the ApplicationHost.config accesses to a network location, in order to enable shared configuration on a Web farm. IIS Manager uses Administration.config to specify console-specific configuration, including a list of IIS Manager extensions that the console loads .


Developers often use the section declarations to control the default delegation state of configuration sections, as well as to restrict the scope of where the configuration can be specified. The former is done to prevent non-Administrators from overriding certain configuration sections in Web.config files that they have access to. The latter is done to restrict the usage of the configuration section to the levels where it is actually read by the corresponding Web server feature. For example, WAS and IIS worker processes read the <sites> configuration section at the server level only, and therefore this section is declared with allowDefinition = AppHostOnly.

Installing New Configuration Sections

Armed with an understanding of schema definitions and declarations, adding a new configuration section becomes a two-step process:

  1. Register the section schema.

  2. Declare the section in the desired configuration file.

To register the section schema, use the format described in IIS_schema.xml to create an XML file that contains the definition of the section. Then copy it to the %windir%\System32\Inetsrv\Config\Schema directory. Because the IIS 7.0 configuration system is an In-Process component, you will need to restart each process that needs to read the new configuration section in order to force the process to load the new schema file. This usually means recycling the target application pool or restarting IIS services from a command prompt with Iisreset.exe, which restarts worker processes in all application pools.

Note

To pick up the schema changes, you do not technically need to restart all IIS services, because they will not attempt to access your new section. It should be sufficient to restart each IIS application pool that contains modules or application components that use the new configuration section.

To declare the configuration section, you need to add the section declaration element to the <configSections> section at the level where you want the section to become available. Most IIS configuration sections should be declared in ApplicationHost.config, which enables them to be used at the server level as well as in delegated application Web.config files.

If the section needs to be different for different versions of the .NET Framework, you should declare it in the .NET Framework Machine.config or root Web.config files. This is where the rest of the .NET Framework and ASP.NET sections respectively are declared. Web server features that access configuration inside the IIS worker process automatically receive the configuration from the Framework configuration files of the version specified by the application pool’s managedRuntimeVersion attribute.

If you were planning to use the section only for a particular Web site or application, you could declare it a Web.config file inside the application. However, then you will not be able to read this configuration for other applications nor will you be able to specify the base configuration at the server level for configuration reuse between applications.

That’s it. Once your section definition is registered and the section is declared at the right configuration level, you can now use it in the configuration files side-by-side with IIS configuration.

The Iisschema.exe Tool

Unlike registering section schema, which can be done simply by copying the schema file to %windir%\System32\Inetsrv\Config\Schema, declaring the section requires writing code to manipulate the section declarations for a particular configuration file. In Windows Server 2008 and Windows Vista Service Pack 1 (SP1), you can do this from a .NET application by using the Microsoft.Web.Administration API, as well as from script using WMI or the IIS 7.0 configuration COM objects. To make this easier, you can use the Iisschema.exe command line tool, which dramatically simplifies installing and managing configuration sections. You can also use the tool to quickly check which sections are installed and declared on the server or a specific configuration level.

For example, you can quickly install the schema file and automatically declare all of the sections defined therein in ApplicationHost.config by using the following command:

IisSchema.exe /install <schemafile.xml>

Alternatively, you can declare specific configuration sections at a specific configuration path and then set specific section declaration attributes by using the "Iisschema.exe /reg <SectionName> /path:<ConfigPath>" command. You can also modify any of the existing declarations or list all of the configuration sections declared at a specific configuration path.

To get help for all of the parameters supported by the tool, run it without parameters as follows:

IisSchema.exe

Securing Configuration Sections

Unlike Web server modules, configuration sections do not contain any code and therefore pose significantly less risk to the system. At the time of this writing, we are not aware of ways that you can reduce the security of your server by installing new configuration sections. You can, however, introduce risk by installing administration extensions that do contain code.

When adding a new configuration section, you must consider a few concerns. First, because configuration is intended to alter the behavior of the server, it is important to maintain control over who can modify it and how to avoid compromising the server’s operation.

By default, IIS 7.0 already restricts the ability to change configuration in server-level configuration files to Administrators. However, on servers where control over the application content is delegated to non-Administrators, those users can specify configuration in delegated Web.config files and thereby override the configuration set at the server level for those sites/applications. Even in cases where the server administrator controls the application content, application components from third parties can end up making undesired configuration settings. Because of this, Administrators need to determine which configuration sections should be used only at the server level, where the server administrator maintains control, and which can be overridden at the application level. The next section discusses controlling configuration delegation.

Second, the configuration data itself may contain sensitive information, such as account passwords or connection strings, and therefore you may want to take additional precautions to prevent unintended disclosure of this information. You can do this by requesting that certain parts of the new configuration section be automatically encrypted when the configuration is written so that the data is not persisted in clear-text form. This supplements the protection afforded by access restrictions on the configuration files and also protects the information from disclosure when the files are transported off of the physical server. In this section, we’ll take a closer look at doing this.

Controlling Configuration Delegation

If you are running a shared server on which the server administrator is not the same person as the site or application administrator, you should consider which configuration sections can be overridden at the site or application level. You should not allow delegation for any configuration section that can enable the application to compromise the security of the server, dramatically affect its performance, or gain access to other applications’ configuration or data.

The basic mechanism for controlling the delegation of a new section is to prevent it from being overridden at a lower level, unless it is explicitly unlocked by the Administrator. This is done by specifying allowOverrideDefault = False in the section declaration. Most IIS configuration sections declared in ApplicationHost.config use this technique.

Note

You can also use the allowDefinition attribute in the section declaration to limit the use of this section to Machine or ApphostOnly scopes. However, it should never be used as a mechanism for controlling delegation for the section because it cannot be "unlocked" by the Administrator, unlike allowOverrideDefault. The allowDefinition attribute is meant to restrict the use of the section to configuration levels where the section is applicable based on how this section is interpreted by the corresponding run-time consumer.

Once you specify allowOverrideDefault = False in the section declaration, by default, lower configuration levels cannot override this section. However, Administrators can always unlock this section later to allow it to be specified at lower levels. To do this, they wrap the configuration section by using a location tag that can specify the overrideMode attribute to indicate that the section is locked or unlocked. The following example shows a configuration section with allowOverrideDefault="Deny" being unlocked:

<location path="" overrideMode="Allow">
     <system.webServer>
         <tracing>
             <traceFailedRequests />
         </tracing>
     </system.webServer>
 </location>

Setting overrideMode to "Deny" would lock the section. The path attribute indicates which configuration path the location section is used for, and it therefore determines the scope of the locking or unlocking decision. The "" value in this case means unlock for all configuration levels, whereas a value of "Default Web Site/" would mean unlock for the site called "Default Web Site" only.

Instead of modifying configuration directly, you can do it easily with the Appcmd command line tool. For example, to unlock the <asp> section so that it can be defined anywhere in the configuration hierarchy, use this code.

%windir%\system32\inetsrv\AppCmd unlock config /section:asp

In addition, the Administrator can unlock this section for a specific site or application and then leave it locked for others. For example, to unlock the <asp> section only for the "Default Web Site/MyApp" application, use this code:

%windir%\system32\inetsrv\AppCmd unlock config "Default Web Site/MyApp"
    /section:<SectionName>

By using the Appcmd Lock Config command, the Administrator can also lock sections that are currently unlocked. They can also manage the delegation state of configuration sections by using IIS Manager.

Caution

Configuration delegation is intended to control write access to configuration on shared servers, and it is less applicable on dedicated servers where the server administrator controls both the server and site configuration. However, it is good practice to always restrict the delegation of configuration sections, even on dedicated servers, and to unlock each configuration section specifically whenever it needs to be used at the application level. This reduces the risk of the application code accidentally specifying undesired configuration settings in the future without the knowledge of the Administrator. This is especially useful when installing applications that come from third parties and that may end up including undesired configuration in Web.config files.

In some cases, section-level delegation control is not flexible enough, and you’ll need to allow some parts of the configuration section to be overridden while at the same time locking others. The configuration system provides a number of mechanisms to accomplish this via attribute, element, and collection locking. 

Protecting Sensitive Configuration Data

The IIS 7.0 configuration system provides an encryption mechanism that can protect sensitive information from being accessed by an attacker if access is gained to the physical configuration file. This is primarily intended to protect the configuration data when it is transported off the machine and is not properly protected by ACLs. While on the server, the ACLs on configuration files are the main mechanism for securing access to configuration.

You can use configuration encryption to manually encrypt the value of any attribute in any IIS 7.0 configuration section. However, if you know your configuration section contains sensitive data, you should take advantage of automatic encryption by marking the sensitive attributes in your configuration section schema to always be encrypted. This is similar to the encrypted properties support in the metabase in previous versions of IIS, except you can easily take advantage of it to encrypt any part of your own configuration section.

Note

The IIS 7.0 configuration system provides attribute-level encryption support, unlike the ASP.NET configuration system that uses section-level encryption. Though this is a more flexible and sometimes more efficient mechanism (it enables you to encrypt only the sensitive data in the section and leave the rest unencrypted), it does have a few unfortunate side effects. The first is that you cannot use Aspnet_regiis.exe or ASP.NET encryption to encrypt IIS configuration sections.

The second, and arguably the most painful, side effect is that you cannot use the IIS administration stack to access ASP.NET configuration that has been encrypted with section-level encryption. You can, however, use the Microsoft.Web.Administration APIs to access the IIS configuration sections from ASP.NET modules and .NET applications, instead of using System.Configuration. Finally, you cannot use IIS attribute-level encryption to encrypt .NET Framework or ASP.NET configuration sections.

This is done by including the encrypted property to true on any of the attribute definitions in your configuration section schema. Several built-in IIS 7.0 configuration sections use this mechanism to insure that their sensitive content remains encrypted. For example, the anonymousAuthentication section marks the anonymous user password attribute as encrypted.

  <sectionSchema
name="system.webServer/security/authentication/anonymousAuthentication">
    ...
    <attribute name="password" type="string" caseSensitive="true"
encrypted="true" defaultValue="[enc:AesProvider::enc]" />
    ...
  </sectionSchema>

By specifying the encrypted property on the attribute schema definition, you insure that whenever any configuration API or tool writes data to this attribute, it is persisted in the encrypted form. You specify the default encryption provider that the configuration system uses for this property by referencing it through the default value, as in the previous example.

The encryption is transparent to the writer. In addition, whenever this attribute is read by a caller that has access to the configuration encryption key, the decryption is also transparent so that the caller obtains the plain text value of this attribute.

Caution


Although encryption protects your configuration data from being accessed if someone gains physical access to the file, it does not protect your configuration from code within the IIS worker process. The configuration system inside the worker process automatically decrypts any encrypted configuration (assuming the worker process has access to the key container). Therefore, any code inside the worker process can access the information. In fact, aside from using application pool isolation to prevent access to configuration intended for other application pools, there is no way to restrict configuration access to a particular component within the worker process and not make it available to other components in the process. 

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