lørdag den 23. februar 2013

SharePoint/CRM/Exchange and other Claims based websites with Social Sign in

The last week I have been working on a project, regarding combining Claims based authentication and login using Social Providers. In the cloud control panel that I normal work on, I have implemented support for signing in using Office 365, Azure AD, pass-through using Azure ACS, and the mandatory Open ID, Google ID, Windows Live ID, LinkedIn, Facebook, and Twitter. But for reasons I don’t want go into, a need came up, to create a simple STS (Secure Token Service), than would “tie” together one or more identities from social network, and offer those to websites and applications supporting WIF/Claims based authentication.

Why a new STS
If you implemented Social Network, either directly, or indirectly though ACS you probably noticed that if a user sign in using Google ID they will not be the same user, if they later decide to sign in using Facebook. That is relatively easy to “handle” if you wrote the application your self, and Microsoft did a decent job, tying it all up, using the membership provider together with DotNetOpenAuth in MVC 4, but if you don’t want to mess with wrapping up your own customer member ship provider, or if your facilitating WIF in Exchange/CRM/SharePoint/Navision or what ever, wouldn’t it just be awesome if you could just get it all “out of the box” some where. And what if that Service would also allow you to setup your own Identity Providers, so you could implement sign in using Office 365/Azure AD, your own ADFS server, or any other Secure Token Service you might have. You can now

The basic setup
We are still figuring out license models and such, but for now were thinking either a hosted solution, and one where you get the website to run for your self, lets image a hosted setup, and after that you get billed a small amount for each 100k users or something like that. So let’s imaging you want to implement this with Microsoft CRM 2011.

  • First signup for an account, you then get access to a Manage menu. But before you go there, head to CRM and start the “Configure Claims-Based Authentication” wizard
    image
    Type in the URL of the Secure Token Service
    image
    Select a certificate to use, when signing the Claims inside the tokens (this certificate needs to exists on all your CRM servers if you got more than one. It can be a self signed, from your internal CA, or one you bought from a third party
    image
    Go though the rest. Go though the “Configure Internet-Facing Deployment” if you haven't don’t so already, and at the end note the URL to the CRM servers metadata.xml file
  • Go to the STS, click Relays, past in the URL from the “Create new relying part” field, and press Create. By default all Social connectors will be allowed, but if you only want for instance Live ID, select that under Identity Providers, and hit Save.

And that is that. SharePoint how ever doesn’t have these cool metadata.xml files, so configuring that, will take a tiny bit more work, but not to worry, that is why we got PowerShell.

  • Open a PowerShell prompt locally on any of the servers in your farm. And run the following PowerShell Script . ( there is a link on the Relaying Party page too ) Make sure you modify the variables at the top to fit your installation
  • Head to the STS, click management, type a meaningful name into “Create new relying part” field, and press Create
    If you went with the defaults in the script, SharePoint should be sending a reply URL, so we can leave PassiveRequestorURI blank.
    SharePoint (default) doesn’t want the claims to be encrypted so we don’t need to add a certificate.
    Under “Audience Uris” add each of the URN’s that was mapped for each of the websites, show in the end of the script.

And you are all done.

Adding Azure AD, office 365, Azure ACS or an ADFS server
That’s all nice, but what about all your local users, or all your Office 365 users ?
Not a problem, head to the “Providers” page, and type in the URL to the metadata file.

If you are using Office 365 or Azure AD the URL will look something like this
https://accounts.accesscontrol.windows.net/<tenant>.onmicrosoft.com/FederationMetadata/2007-06/FederationMetadata.xml

If your using Microsoft ACS, your URL will look something like this
https://<yourname>.accesscontrol.windows.net/FederationMetadata/2007-06/FederationMetadata.xml
(note, someone at Microsoft fucked this up, so it doesn’t sent a Signing Certificate, but it does doing Office 365 … it’s the same certificate thou, so is easy to grab )

If your using ADFS, the URL will look something like
https://adfs.wingu.dk/FederationMetadata/2007-06/federationmetadata.xml

If your using ACS or ADFS, you don’t need to do anything else than going to the ADFS Server/Azure ACS/Azure AD website and add https://STS/FederationMetadata.xml and it will all configure it self. If how ever your using Office 365, you need to add a ServicePrincipal representing the STS. At the top of the Provider screen is a link to a powershell scrip that will set this up. Once the script is run, past in the “spn:<guid>” from the output of the script into the Target Realm field of the new Provider.

Lastly, go back to your Relying Party, and you can now also select your new Office 365 or what ever Provider you added, and let your users sign in using that

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