AM 7.3.1

Kerberos node

Enables desktop single sign-on such that a user who has already authenticated with a Kerberos Key Distribution Center can authenticate to AM without having to provide the login information again.

To achieve this, the user presents a Kerberos token to AM through the Simple and Protected GSS-API Negotiation Mechanism (SPNEGO) protocol.

End users may need to set up Integrated Windows Authentication in Internet Explorer or Microsoft Edge to benefit from single sign-on when logged on to a Windows desktop.

Outcomes

  • True

  • False

Evaluation continues along the True path if Windows Desktop SSO is successful; otherwise, evaluation continues along the False path.

Properties

Property Usage

Service Principal

Specifies the Kerberos principal for authentication in the format HTTP/AM-DOMAIN@AD-DOMAIN, where AM-DOMAIN corresponds to the host and domain names of the AM instance, and AD-DOMAIN is the domain name of the Kerberos realm (the FQDN of the Active Directory domain). AD-DOMAIN can differ from the domain name for AM.

In multi-instance AM deployments, configure AM-DOMAIN as the FQDN or IP address of the load balancer in front of the AM instances.

For example, HTTP/AM-LB.example.com@KERBEROSREALM.INTERNAL.COM.

For more information, refer to the KB article How do I set up the WDSSO authentication module in AM in a load-balanced environment?.

Key Tab File Path

Specifies the full, absolute path of the keytab file for the specified Service Principal.

You generate the keytab file using the Windows ktpass utility; for example:

C:\> ktpass -out fileName.keytab -princ HTTP/openam.example.com@AD_DOMAIN.COM -pass +rdnPass -maxPass 256 -mapuser amKerberos@frdpcloud.com -crypto AES256-SHA1 -ptype KRB5_NT_PRINCIPAL -kvno 0

Kerberos Realm

Specifies the name of the Kerberos (Active Directory) realm used for authentication.

Must be specified in ALL CAPS.

Kerberos Server Name

Specifies the fully qualified domain name, or IP address of the Kerberos (Active Directory) server.

Trusted Kerberos realms

Specifies a list of trusted Kerberos realms for user Kerberos tickets. If realms are configured, then Kerberos tickets are only accepted if the realm part of the user principal name of the user’s Kerberos ticket matches a realm from the list.

Each trusted Kerberos realm must be specified in all caps.

Return Principal with Domain Name

When enabled, AM returns the fully qualified name of the authenticated user rather than just the username.

Lookup User In Realm

Validates the user against the configured data stores. If the user from the Kerberos token is not found, evaluation continues along the False path.

This search uses the Alias Search Attribute Name from the core realm attributes. For more information about this property, refer to User profile.

Is Initiator

When enabled (true), specifies that the node is using initiator credentials, which is the default.

When disabled (false), specifies that the node is using acceptor credentials.

Example

This flow attempts to authenticate the user with Windows Desktop SSO. If unsuccessful, AM requests the username and password for login. Meter nodes are used to track metrics for the various paths through the flow:

An example that uses the Kerberos node