Realm administrator account may be specified using different form:
Administrator, DOM\Administrator, Administrator@DOMAIN
This patch introduces handling of the second two forms:
- In DOM\Administrator only user name is used, short domain name
is then taken from a discovered record from the AD DC
- In Administrator@DOMAIN first DOMAIN is verified to be the same
as the domain we are establishing trust to, and then user name
is taken, together with short domain name taken from a discovered
record from the AD DC
Note that we do not support using to-be-trusted domain's trusted domains'
accounts to establish trust as there is basically zero chance to verify
that things will work with them. In addition, in order to establish trust
one needs to belong to Enterprise Admins group in AD or have specially
delegated permissions. These permissions are unlikely delegated to the
ones in already trusted domain.
https://fedorahosted.org/freeipa/ticket/2864
When using ipaExternalGroup/ipaExternalMember attributes it is
possible to add group members which don't exist in IPA database.
This is primarily is required for AD trusts support and therefore
validation is accepting only secure identifier (SID) format.
https://fedorahosted.org/freeipa/ticket/2664
Alexander Bokovoy