Kerberos 5 migration pam module
auth optional pam_krb5_migrate.so
pam_krb5_migrate is a stackable authentication module that takes a username and password from an earlier module in the stack, and attempts to transparently add them to a Kerberos realm using the Kerberos 5 kadmin service.
The module can be used to ease the administrative burdens of migrating a large installed userbase from pre-existing authentication methods to a Kerberos-based setup.
The following options may be passed to the authentication module:
syslog(3) debugging information at LOG_DEBUG level.
use alternate keytab for authentication (default is /etc/security/pam_krb5.keytab).
don't add principals for uids lower than <uid>. (default is 100)
use the key for <name> instead of the default pam_migrate/<hostname> key
update the database for a realm other than the default realm.