OpenSSO can be downloaded from http://download.oracle.com/otn/nt/middleware/11g/oracle_opensso_80U2.zip.
Once downloaded, extract the package into a suitable location. This location will be referred to as OPENSSO_HOME in this example.
There is also possibility to use OpenAM instead of OpenSSO server. OpenAM is free and integration steps with GateIn 3.2 and OpenAM are very similar as with OpenSSO. More info is here .