View source for BXadmin:Dce.psu.edu migration

This would not be a complete migration. Real user accounts would live in dce.psu.edu. All other system accounts and admin accounts would remain in BX.PSU.EDU.

Some thoughts:
* Because of the BX.PSU.EDU -> dce.psu.edu trust, abc123@dce.psu.edu can request afs/bx.psu.edu@BX.PSU.EDU service tickets. There is now a krb.conf file on all the fileservers and dbservers to make dce.psu.edu an additional 'local' realm. This makes abc123@dce.psu.edu appear as abc123 to the filesystem. '''[DONE]'''
* would need a bxAFSUserName, similar to bxAFSGroupID, but storing the PTS entry name, not the ID, to account for the disconnect between the POSIX username and the PTS name. '''[DONE] - bxAFSPTSName'''


Things to do/check:
* Default ticket lifetime and renewal time with AIT. Need at least 2 weeks default lifetime so that cluster users are happy '''[VERIFIED]''' - 14 days, 28 days
* ssh + GSSAPI:
** Linux: works on RHEL5 and RHEL6. Should check debian just for completeness. '''[DONE]''' - in cfengine
** OSX - works on 10.6 with the additonal krb5.conf rules below
* ssh + password:
** Linux - works on Linux with second pam_krb5.conf entry. '''[GOOD]'''
** OSX - Works on OSX 10.6.x if krb5AuthAuthority is set correctly for dce.psu.edu '''[GOOD]'''
* IMAP - works with password auth, krb5_kuserok is returning false because username != princpalname, even with krb5.conf rules '''[DONE]''' - rebuilt dovecot against MIT instead of Heimdal. Works with Horde too
* remctl - works fine, principal name looks correct '''[GOOD]'''
* LDAP - GSSAPI binds work, will need additonal rules or ACLs to work with @dce.psu.edu principal names '''[DONE]''' - in cfengine
* graphical login:
** linux - fine with pam modifications '''[GOOD]'''
** windows - need to check Windows OpenAFS client to see if Integrated Login works as expected when bound to ACCESS.PSU.EDU '''[DONE]''' - Need Domain key under the NP key. Will use startup script to push out correct registry settings similar to psuksetup.reg
** osx:
*** 10.6 - password checks work with loginwindow, tickets only with default_realm = dce.psu.edu
* WebLogin:
** Change cosign cgi rules to make dce.psu.edu logins set REMOTE_USER=abc123 and REMOTE_REALM=dce.psu.edu, and leave FPS the way it is '''[DONE]''' - needed to patch cosign to pass cosignname before any regex matching/substitution
** The dc=psu,dc=edu backend will return an entry if uid=abc123 exists under dc=bx,dc=psu,dc=edu, but return nothing if abc5123 does not have an entry. '''[DONE]''' - created dc=dce,dc=psu,dc=edu for uid=abc123 that doesn't exist in dc=bx,dc=psu,dc=edu. Need to document this requirement for adding dce.psu.edu users to web groups.
** Need to verify that cosign can get kerberos credentials for dce.psu.edu logins so the web apps that do GSSAPI will continue to work - '''[DONE]''' - also fixed SPNEGO for both realms!
* ldap2pts: 
** Almost works with the new bxAFSPTSName attribute. 
** User synchronization works
** Group sync needs some more work, maybe an hour or two, to verify logical correctness and to clean up verbose/debug messages
* admin.bx.psu.edu web apps:
** password change - Need to exclude dce users somehow '''[DONE]''' - just check REMOTE_REALM
** mail forwarding - Dependent on cosign doing the right thing - '''[DONE]''' - cosign gets kerb tickets for both realms just fine
* SGE - umm, shouldn't be a problem. Need to look at get_tokens.sh and set_token.sh to make sure BX.PSU.EDU isn't specified anywhere.
* RADIUS - No changes here, already supports both realms

'''BIG QUESTION''' - Do we change the value of default_realm everywhere? Would this break anything?

krb5.conf modifications, add these lines to the [realms] BX.PSU.EDU section:
<pre>auth_to_local = RULE:[1:$1@$0](.*@dce\.psu\.edu)s/@.*//
auth_to_local = DEFAULT</pre>
These have been added as of cfengine commit ff8d17f29d3dbd47aa81c25800a400edcec32773