Chances are that if you authenticate externally, you've tested your luck with credential maps. I say "luck" because deciphering its syntax for the first time is akin to waiting in line to use the restroom: frustratingly painful. In a nutshell, credential maps are a part of the ProxyConnections8 component that allow you to link ADSGs (and their members) to Oracle UCM roles and/or accounts.
If you need a credential map that can link everything one-to-one:
ADSG Role/Account admin » admin contributor » contributor intern » intern Corporate_R » Corporate(R) ImageLibrary_RW » ImageLibrary(RW)
use the following:
#Maps all roles|#all|, %%
#Maps all accounts@|#all|, @%%
Note: the #all term does not refer to an ADSG named #all; it is a reserved keyword to signify ALL ADSGs listed within the LDAP Role/Account Prefix OU.
As powerful as the above map is, it has one fundamental flaw:
It doesn't map the #none and #all accounts