Cross domain authentication

Here is my scenario:

Users and workstations at site X authenticate to an AD under, let's say, Domain-X

The servers are hosted at a remote data centre, which has a domain named Domain-Y.

Now, the users need to access the web portals under Domain-Y. In this case, should I deploy an ADFS in the data centre perimeter network to handle the authentication requests? I've read up a bit on ADFS and it seems that it is not trivial to set this up.

In actual fact, the users, workstations and servers all belong to the same organization, and I want to keep things simple. I thought of setting up a one way trust from the server domain (Domain-Y) to the site X domain (Domain-Y). But in doing so, do I still need an ADFS?

Lastly, does the AD at Domain-Y need a connection to the AD at Domain-X to retrieve the user account info?

All help is much appreciated. Thanks in advance.
Christopher OngAsked:
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LesterClaytonCommented:
ADFS is not trivial at all - excpet of course to ADFS experts.  Unfortunately, I am not one.  If however you have direct access to from Domain-X to Domain-Y (via site-to-site VPN for example), then you can probably get away with doing a regular trust relationship between the two domains - and then be able to grant permissions quite easily that way.

If Domain-X and Domain-Y are part of the same AD Forest, then you already have the trust set up.  With a trust, both Domain-X and Domain-Y need to be able to talk to each other.
Christopher OngAuthor Commented:
What you've said confirmed my worst fears i.e. ADFS is not trivial. My issue is compounded by the fact that the data centre, being a third party, has imposed certain restrictions.

For one, they don't allow the AD at site X to talk to the AD at the data centre directly. Although there is site-to-site VPN between site X and the DC, it terminates at the perimeter network. The two domains are distinct, therefore they are in different forests which is why I need to set up an explicit trust. But as you have mentioned, a trust won't work if both ADs cannot talk to each other directly. That's what led me to think about ADFS.

What approach would you suggest to simplify deployment?
LesterClaytonCommented:
It seems that ADFS can be your solution in that case, because it's specifically designed to grant access to web applications based on tokens (Claims based authentication).

A good blog on how it works can be seen here: http://techbixz.blogspot.no/2014/12/single-sign-on-sso-for-office-365-and.html - and it contains a nice diagram entitled "ADFS Simplified"

Technet also provides deployment guides - available at https://technet.microsoft.com/en-us/library/dd807092.aspx

Unfortunately, that's as much help as I am able to give - I wish I had more ADFS experience myself.

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