AD LDS proxy objects are used in special cases where an application can perform a simple LDAP bind to AD LDS but the application still needs to associate the AD LDS user with a security principal (user account) in Active Directory. A process through which AD LDS can accept a bind request from an application and redirect this bind request to Active Directory, based on the contents of a proxy object, is referred to as bind redirection.
Bind redirection occurs when a bind to AD LDS is attempted using a proxy object (user proxy) - an object in AD LDS that represents a user account in Active Directory. Each proxy object in AD LDS contains the security identifier (SID) of a user in Active Directory. When an application attempts to bind to a proxy object, AD LDS takes the SID that is stored in the proxy object, together with the password that is supplied at bind time, and presents the SID and the password to Active Directory for authentication.
A proxy object in AD LDS represents an Active Directory user account, and it can be augmented to store additional data related to that user account that is specific to the application. Through bind redirection, applications can take advantage of the identity store of Active Directory, while retaining the flexibility of using AD LDS as an application data store.
To add a proxy object to AD LDS
- In the console tree, expand the AD LDS (ADAM) container.
- In the console tree, under AD LDS (ADAM), expand the directory partition to which you want to add a proxy object and locate the container to which you want to add the proxy object.
- In the console tree, right-click the container to which you want to add the proxy object, and select New | Proxy Object to start the wizard that will help you create a proxy object.
- Specify a name for the proxy object; then, click Next.
- Click Select and choose the Active Directory domain user account you want to be represented by the proxy object; then, click Next.
- If you want to set values for additional properties (those for which the wizard pages do not provide data entries), click Edit Attributes on the completion page of the wizard.
- After setting any additional properties for the new object, click Finish on the completion page of the wizard.
You can examine an existing proxy object by using the Properties command on that object. The Properties dialog box allows you to view the user account that is represented by the proxy object. However, due to a limitation of AD LDS, this setting cannot be changed on an existing proxy object. You can select an Active Directory domain user account only at the time that the proxy object is created. After a proxy object is created, this setting cannot be modified.
When creating a proxy object, you can select a user account from any domain that is registered with Active Roles, provided that the domain is trusted by the computer on which the AD LDS instance is running.
A proxy object for a domain user cannot be created in an AD LDS directory partition that already contains a foreign principal object (FPO) or a proxy object for that same domain user.
For a given user account in Active Directory, you can view a list of proxy objects that represent the user account in AD LDS: In the Properties dialog box for the user account, go to the Object tab and click AD LDS Proxy Objects.