IPA Integration with an External KDC (AD) for SSO

Red Hat Identity Management (IPA) is a centralized authentication and identity management solution that can integrate with Windows Active Directory to provide single sign-on for external KDC users. This configuration allows users who are not part of the IPA domain to authenticate using their Active Directory or external KDC credentials and access IPA resources.

Here are the steps to configure Red Hat IPA to authenticate with Windows Active Directory for single sign-on with external KDC users:

1. Install and configure IPA server and Windows Active Directory server separately.

Before you can configure IPA and Active Directory integration, you need to have both servers installed and configured. Red Hat provides detailed documentation on how to set up and configure the IPA and Active Directory servers.

2. Set up the trust relationship between the IPA and Active Directory domains.

The trust relationship between the IPA and Active Directory domains allows users in one domain to access resources in the other domain. To set up the trust relationship, use the "ipa trust-add" command.

shell

Copy code

# ipa trust-add ad.example.com --type=ad

3. Configure the Kerberos realm in the IPA domain to trust the Active Directory realm.

To authenticate external KDC users using Active Directory, you need to configure the Kerberos realm in the IPA domain to trust the Active Directory realm. This can be done using the "ipa-adtrust-install" command.

css

Copy code

# ipa-adtrust-install --add-kdc --enable-compat

4. Add the external KDC users to Active Directory and assign them the required permissions.

Add the external KDC users to Active Directory and assign them the necessary permissions to access the resources in the IPA domain. This can be done using the "dsadd" command.

sql

Copy code

# dsadd user "cn=External User,cn=Users,dc=ad,dc=example,dc=com" -samid ExternalUser -upn ExternalUser@ad.example.com -fn External -ln User -pwd P@ssw0rd

5. Configure the IPA domain to synchronize user accounts from Active Directory.

To allow users in Active Directory to authenticate with IPA, you need to configure the IPA domain to synchronize user accounts from Active Directory. This can be done using the "ipa-adtrust-install" command.

python

Copy code

# ipa-adtrust-install --enable-compat

6. Add the external KDC users to the IPA domain.

After synchronizing the user accounts, you can add the external KDC users to the IPA domain using the "ipa user-add" command.

css

Copy code

# ipa user-add externaluser --first=External --last=User --password

7. Set up a trust relationship between the external KDC and the IPA domain.

To allow external KDC users to authenticate with IPA, you need to set up a trust relationship between the external KDC and the IPA domain. This can be done using the "ipa trust-add" command.

kotlin

Copy code

# ipa trust-add external.kdc --type=external --external

8. Configure the IPA domain to use Active Directory as the primary identity provider for authentication.

To configure the IPA domain to use Active Directory as the primary identity provider for authentication, modify the "ipa" section in the /etc/sssd/sssd.conf file on the IPA server.

python

Copy code

[domain/ipa.example.com] ... ipa_domain = ipa.example.com ... auth_provider = ad ad_domain = ad.example.com ...

9. Test the configuration.

After completing the configuration, you can test the single sign-on by logging in to an IPA client using an Active Directory or external KDC user account.

ruby

Copy code

$ ssh externaluser@ipa.example.com

In conclusion, configuring Red Hat IPA to authenticate with Windows Active Directory for single sign-on