Adding Many-To-One Mappings <add>

Overview

The <add> element of the <manyToOneMappings> element adds unique client certificate mappings to the collection of many-to-one mappings.

Each of the many-to-one mappings are mapped to a user account and password, which can be used in place of the more commonly-used methods of authentication, such as Windows authentication or Basic authentication.

There are two different access methods that you can enable for many-to-one rules: Allow or Deny. These settings enable you to create rules that will accept groups of client certificates which you will allow access to your site, while denying access to other groups of certificates based on different criteria. For example, you could create a rule that allowed access to all Contoso employees in your Human Resources organization unit, while denying access to employees in the Sales organization unit.

Note: Many-to-one certificate mappings differ from one-to-one certificate mappings, which map individual client certificates to individual user accounts.

Compatibility

Version Notes
IIS 7.5 The <add> element was not modified in IIS 7.5.
IIS 7.0 The <add> element of the <manyToOneMappings> element was introduced in IIS 7.0.
IIS 6.0 The <manyToOneMappings> element replaces the IIS 6.0 IIsCertMapper metabase object.

Setup

The <iisClientCertificateMappingAuthentication> element is not available on the default installation of IIS 7. To install it, use the following steps.

Windows Server 2008 or Windows Server 2008 R2

  1. On the taskbar, click Start, point to Administrative Tools, and then click Server Manager.
  2. In the Server Manager hierarchy pane, expand Roles, and then click Web Server (IIS).
  3. In the Web Server (IIS) pane, scroll to the Role Services section, and then click Add Role Services.
  4. On the Select Role Services page of the Add Role Services Wizard, select IIS Client Certificate Mapping Authentication, and then click Next.

  5. On the Confirm Installation Selections page, click Install.
  6. On the Results page, click Close.

Windows Vista or Windows 7

  1. On the taskbar, click Start, and then click Control Panel.
  2. In Control Panel, click Programs and Features, and then click Turn Windows Features on or off.
  3. Expand Internet Information Services, then select IIS Client Certificate Mapping Authentication, and then click OK.

How To

There is no user interface for configuring IIS Client Certificate Mapping authentication for IIS 7. For examples of how to configure IIS Client Certificate Mapping authentication programmatically, see the Code Samples section of this document.

Configuration

Attributes

Attribute Description
Description Optional string attribute.

Specifies the description of this one-to-many mapping.
enabled Optional Boolean attribute.

Specifies whether this one-to-many mapping is enabled.

The default value is true.
name Required string attribute.

Specifies the name of this one-to-many mapping.
password Optional string attribute.

Specifies the password of the account used to authenticate clients that match this rule.

Note: To avoid storing unencrypted password strings in configuration files, always use AppCmd.exe or IIS Manager to enter passwords. If you use these management tools, the password strings will be encrypted automatically before they are written to the XML configuration files. This provides better password security than storing unencrypted passwords.
permissionMode Optional enum attribute.

The permissionMode attribute can be one of the following possible values. The default is Allow.
Value Description
Allow Specifies that clients with a matching client certificate should be allowed permission to authenticate.

The numeric value is 1.
Deny Specifies that clients with a matching client certificate should be denied permission to authenticate.

The numeric value is 2.
username Optional string attribute.

Specifies the username of the account used to authenticate clients that match this rule.

Child Elements

Element Description
rules Optional element.

Specifies criteria for mapping client certificates with IIS so that many clients can use one certificate.

Configuration Sample

The following configuration sample performs the following actions for the Default Web Site:

  • Enables IIS Client Certificate Mapping authentication using many-to-one certificate mapping.
  • Creates a many-to-one certificate mapping rule for a user account based on the organization field in the subject of the client certificate matching Contoso.
  • Configures the site to require SSL and to negotiate client certificates.
<location path="Default Web Site">
   <system.webServer>
      <security>
         <authentication>
            <windowsAuthentication enabled="false" />
            <anonymousAuthentication enabled="false" />
            <digestAuthentication enabled="false" />
            <basicAuthentication enabled="false" />
            <iisClientCertificateMappingAuthentication enabled="true"
                  manyToOneCertificateMappingsEnabled="true">
               <manyToOneMappings>
                  <add name="Contoso Employees"
                        enabled="true"
                        permissionMode="Allow"
                        userName="Username"
                        password="[enc:AesProvider:57686f6120447564652c2049495320526f636b73:enc]">
                     <rules>
                        <add certificateField="Subject"
                           certificateSubField="O"
                           matchCriteria="Contoso"
                           compareCaseSensitive="true" />
                     </rules>
                  </add>
               </manyToOneMappings>
            </iisClientCertificateMappingAuthentication>
         </authentication>
         <access sslFlags="Ssl, SslNegotiateCert" />
      </security>
   </system.webServer>
</location>

Sample Code

The following code samples perform the following actions for the Default Web Site:

  • Enable IIS Client Certificate Mapping authentication using many-to-one certificate mapping.
  • Create a many-to-one certificate mapping rule for a user account based on the organization field in the subject of the client certificate matching Contoso.
  • Configure the site to require SSL and to negotiate client certificates.

AppCmd.exe

appcmd.exe set config "Default Web Site" -section:system.webServer/security/authentication/iisClientCertificateMappingAuthentication /enabled:"True" /manyToOneCertificateMappingsEnabled:"True" /commit:apphost

appcmd.exe set config "Default Web Site" -section:system.webServer/security/authentication/iisClientCertificateMappingAuthentication /+"manyToOneMappings.[name='Contoso Employees',enabled='True',permissionMode='Allow',userName='Username',password='Password']" /commit:apphost

appcmd.exe set config "Default Web Site" -section:system.webServer/security/authentication/iisClientCertificateMappingAuthentication /+"manyToOneMappings.[name='Contoso Employees'].rules.[certificateField='Subject',certificateSubField='O',matchCriteria='Contoso',compareCaseSensitive='True']" /commit:apphost

appcmd.exe set config "Default Web Site" -section:system.webServer/security/access /sslFlags:"Ssl, SslNegotiateCert" /commit:apphost

Note: You must be sure to set the commit parameter to apphost when you use AppCmd.exe to configure these settings. This commits the configuration settings to the appropriate location section in the ApplicationHost.config file.

C#

using System;
using System.Text;
using Microsoft.Web.Administration;

internal static class Sample
{
   private static void Main()
   {
      using (ServerManager serverManager = new ServerManager())
      {
         Configuration config = serverManager.GetApplicationHostConfiguration();

         ConfigurationSection iisClientCertificateMappingAuthenticationSection = config.GetSection("system.webServer/security/authentication/iisClientCertificateMappingAuthentication", "Default Web Site");
         iisClientCertificateMappingAuthenticationSection["enabled"] = true;
         iisClientCertificateMappingAuthenticationSection["manyToOneCertificateMappingsEnabled"] = true;

         ConfigurationElementCollection manyToOneMappingsCollection = iisClientCertificateMappingAuthenticationSection.GetCollection("manyToOneMappings");
         ConfigurationElement addElement = manyToOneMappingsCollection.CreateElement("add");
         addElement["name"] = @"Contoso Employees";
         addElement["enabled"] = true;
         addElement["permissionMode"] = @"Allow";
         addElement["userName"] = @"Username";
         addElement["password"] = @"Password";

         ConfigurationElementCollection rulesCollection = addElement.GetCollection("rules");
         ConfigurationElement addElement1 = rulesCollection.CreateElement("add");
         addElement1["certificateField"] = @"Subject";
         addElement1["certificateSubField"] = @"O";
         addElement1["matchCriteria"] = @"Contoso";
         addElement1["compareCaseSensitive"] = true;
         rulesCollection.Add(addElement1);
         manyToOneMappingsCollection.Add(addElement);

         ConfigurationSection accessSection = config.GetSection("system.webServer/security/access", "Default Web Site");
         accessSection["sslFlags"] = @"Ssl, SslNegotiateCert";

         serverManager.CommitChanges();
      }
   }
}

VB.NET

Imports System
Imports System.Text
Imports Microsoft.Web.Administration

Module Sample

   Sub Main()
      Dim serverManager As ServerManager = New ServerManager
      Dim config As Configuration = serverManager.GetApplicationHostConfiguration

      Dim iisClientCertificateMappingAuthenticationSection As ConfigurationSection = config.GetSection("system.webServer/security/authentication/iisClientCertificateMappingAuthentication", "Default Web Site")
      iisClientCertificateMappingAuthenticationSection("enabled") = True
      iisClientCertificateMappingAuthenticationSection("manyToOneCertificateMappingsEnabled") = True

      Dim manyToOneMappingsCollection As ConfigurationElementCollection = iisClientCertificateMappingAuthenticationSection.GetCollection("manyToOneMappings")
      Dim addElement As ConfigurationElement = manyToOneMappingsCollection.CreateElement("add")
      addElement("name") = "Contoso Employees"
      addElement("enabled") = True
      addElement("permissionMode") = "Allow"
      addElement("userName") = "Username"
      addElement("password") = "Password"

      Dim rulesCollection As ConfigurationElementCollection = addElement.GetCollection("rules")
      Dim addElement1 As ConfigurationElement = rulesCollection.CreateElement("add")
      addElement1("certificateField") = "Subject"
      addElement1("certificateSubField") = "O"
      addElement1("matchCriteria") = "Contoso"
      addElement1("compareCaseSensitive") = True
      rulesCollection.Add(addElement1)
      manyToOneMappingsCollection.Add(addElement)

      Dim accessSection As ConfigurationSection = config.GetSection("system.webServer/security/access", "Default Web Site")
      accessSection("sslFlags") = "Ssl, SslNegotiateCert"

      serverManager.CommitChanges()
   End Sub

End Module

JavaScript

var adminManager = new ActiveXObject('Microsoft.ApplicationHost.WritableAdminManager');
adminManager.CommitPath = "MACHINE/WEBROOT/APPHOST";

var iisClientCertificateMappingAuthenticationSection = adminManager.GetAdminSection("system.webServer/security/authentication/iisClientCertificateMappingAuthentication", "MACHINE/WEBROOT/APPHOST/Default Web Site");
iisClientCertificateMappingAuthenticationSection.Properties.Item("enabled").Value = true;
iisClientCertificateMappingAuthenticationSection.Properties.Item("manyToOneCertificateMappingsEnabled").Value = true;

var manyToOneMappingsCollection = iisClientCertificateMappingAuthenticationSection.ChildElements.Item("manyToOneMappings").Collection;
var addElement = manyToOneMappingsCollection.CreateNewElement("add");
addElement.Properties.Item("name").Value = "Contoso Employees";
addElement.Properties.Item("enabled").Value = true;
addElement.Properties.Item("permissionMode").Value = "Allow";
addElement.Properties.Item("userName").Value = "Username";
addElement.Properties.Item("password").Value = "Password";

var rulesCollection = addElement.ChildElements.Item("rules").Collection;
var addElement1 = rulesCollection.CreateNewElement("add");
addElement1.Properties.Item("certificateField").Value = "Subject";
addElement1.Properties.Item("certificateSubField").Value = "O";
addElement1.Properties.Item("matchCriteria").Value = "Contoso";
addElement1.Properties.Item("compareCaseSensitive").Value = true;
rulesCollection.AddElement(addElement1);
manyToOneMappingsCollection.AddElement(addElement);

var accessSection = adminManager.GetAdminSection("system.webServer/security/access", "MACHINE/WEBROOT/APPHOST/Default Web Site");
accessSection.Properties.Item("sslFlags").Value = "Ssl, SslNegotiateCert";

adminManager.CommitChanges();

VBScript

Set adminManager = WScript.CreateObject("Microsoft.ApplicationHost.WritableAdminManager")
adminManager.CommitPath = "MACHINE/WEBROOT/APPHOST"

Set iisClientCertificateMappingAuthenticationSection = adminManager.GetAdminSection("system.webServer/security/authentication/iisClientCertificateMappingAuthentication", "MACHINE/WEBROOT/APPHOST/Default Web Site")
iisClientCertificateMappingAuthenticationSection.Properties.Item("enabled").Value = True
iisClientCertificateMappingAuthenticationSection.Properties.Item("manyToOneCertificateMappingsEnabled").Value = True

Set manyToOneMappingsCollection = iisClientCertificateMappingAuthenticationSection.ChildElements.Item("manyToOneMappings").Collection
Set addElement = manyToOneMappingsCollection.CreateNewElement("add")
addElement.Properties.Item("name").Value = "Contoso Employees"
addElement.Properties.Item("enabled").Value = True
addElement.Properties.Item("permissionMode").Value = "Allow"
addElement.Properties.Item("userName").Value = "Username"
addElement.Properties.Item("password").Value = "Password"

Set rulesCollection = addElement.ChildElements.Item("rules").Collection
Set addElement1 = rulesCollection.CreateNewElement("add")
addElement1.Properties.Item("certificateField").Value = "Subject"
addElement1.Properties.Item("certificateSubField").Value = "O"
addElement1.Properties.Item("matchCriteria").Value = "Contoso"
addElement1.Properties.Item("compareCaseSensitive").Value = True
rulesCollection.AddElement(addElement1)
manyToOneMappingsCollection.AddElement(addElement)

Set accessSection = adminManager.GetAdminSection("system.webServer/security/access", "MACHINE/WEBROOT/APPHOST/Default Web Site")
accessSection.Properties.Item("sslFlags").Value = "Ssl, SslNegotiateCert"

adminManager.CommitChanges()
Deprecated Elements