Chapter 13. Managing Kerberos principal aliases for users, hosts, and services When you create a new user, host, or service, a Kerberos principal in the following format is automatically added: user_name@REALM host/ host_name@REALM service_name/host_name@REALM Administrators can enable users, hosts, or services to authenticate against Kerberos applications using an alias. This is beneficial in the following scenarios: The user name changed and the user wants to log in using both the and new user name. The user needs to log in using the email address even if the IdM Kerberos realm differs from the email domain. Note that if you rename a user, the object keeps the aliases and the canonical principal name. 13.1. Adding a Kerberos principal alias You can associate alias names with existing Kerberos principals in an Identity Management (IdM) environment. This enhances security and simplifies authentication processes within the IdM domain. Procedure To add the alias name useralias to the account user , enter: To add an alias to a host or service, use the ipa host-add-principal or ipa service-add-principal command respectively instead. If you use an alias name to authenticate, use the -C option with the kinit command: 13.2. Removing a Kerberos principal alias You can remove alias names associated with Kerberos principals in their Identity Management (IdM) environment. Procedure To remove the alias useralias from the account user , enter: To remove an alias from a host or service, use the ipa host-remove-principal or ipa service-remove-principal command respectively instead. Note that you cannot remove the canonical principal name: 13.3. Adding a Kerberos enterprise principal alias You can associate enterprise principal alias names with existing Kerberos enterprise principals in an Identity Management (IdM) environment. Enterprise principal aliases can use any domain suffix except for user principal name (UPN) suffixes, NetBIOS names, or domain names of trusted Active Directory forest domains. Note When adding or removing enterprise principal aliases, escape the @ symbol using two backslashes (\\). Otherwise, the shell interprets the @ symbol as part of the Kerberos realm name and leads to the following error: Procedure To add the enterprise principal alias user@example.com to the user account: To add an enterprise alias to a host or service, use the ipa host-add-principal or ipa service-add-principal command respectively instead. If you use an enterprise principal name to authenticate, use the -E option with the kinit command: 13.4. Removing a Kerberos enterprise principal alias You can remove enterprise principal alias names associated with Kerberos enterprise principals in their Identity Management (IdM) environment. Note When adding or removing enterprise principal aliases, escape the @ symbol using two backslashes (\\). Otherwise, the shell interprets the @ symbol as part of the Kerberos realm name and leads to the following error: Procedure To remove the enterprise principal alias user@example.com from the account user , enter: To remove an alias from a host or service, use the ipa host-remove-principal or ipa service-remove-principal command respectively instead.

Commands:
ipa user-add-principal <user> <useralias> -------------------------------- Added new aliases to user "user" -------------------------------- User login: user Principal alias: user@IDM.EXAMPLE.COM, useralias@IDM.EXAMPLE.COM
kinit -C <useralias> Password for <user>@IDM.EXAMPLE.COM:
ipa user-remove-principal <user> <useralias> -------------------------------- Removed aliases from user "user" -------------------------------- User login: user Principal alias: user@IDM.EXAMPLE.COM
ipa user-show <user> User login: user Principal name: user@IDM.EXAMPLE.COM ipa user-remove-principal user user ipa: ERROR: invalid 'krbprincipalname': at least one value equal to the canonical principal name must be present
ipa: ERROR: The realm for the principal does not match the realm for this IPA server
ipa user-add-principal <user> <user\\@example.com> -------------------------------- Added new aliases to user "user" -------------------------------- User login: user Principal alias: user@IDM.EXAMPLE.COM, user\@example.com@IDM.EXAMPLE.COM
kinit -E <user@example.com> Password for user\@example.com@IDM.EXAMPLE.COM:
ipa: ERROR: The realm for the principal does not match the realm for this IPA server
ipa user-remove-principal <user> <user\\@example.com> -------------------------------- Removed aliases from user "user" -------------------------------- User login: user Principal alias: user@IDM.EXAMPLE.COM