Sunday, July 24, 2016

Publishing Exchange Server 2016 "Outlook Web App" to the Internet with AD FS

We can Publishing Outlook Web App via Web Application Proxy with using the Integrated Windows Authentication. Web Application proxy performs pre-authentication as required and can be perform SSO to the published  Windows  authentication we must add a non-claims-aware relying party trust for the application to the Federation Service.

To publish OWA uses claims for authentication, we must add a relying party trust for the application to the Federation Service. When publishing claims-based applications and accessing the application from a browser, the general authentication flow is as follows:


  • The client attempts to access a OWA using a web browser; for example, https://mail.tech.com/owa/.
  • The web browser sends an HTTPS request to the Web Application Proxy server which redirects the request to the AD FS server.
  • The AD FS server authenticates the user and the device and redirects the request back to Web Application Proxy. The request now contains the token. The AD FS server adds a single sign-on (SSO) cookie to the request because the user has already performed authentication against the AD FS server.
  • Web Application Proxy validates the token, adds its own cookie, and forwards the request to the Exchange server.
  • The Exchange server redirects the request to the AD FS server to get the OWA security token.
  • The request is redirected to the Exchange server by the AD FS server. The request now contains the application token and the SSO cookie. The user is granted access to the OWA.

Setting up ADFS server


From ADFS server manager add the ADFS server role, once finished the installation the ADFS role, now time to configure ADFS server
Select configure federation server and we are creating new ADFS server so select "create the first federation server in a federation farm"

Now we need to select the user which will configure ADFS server

Once we select the user than select the SSL certificate and Federation server Name
Again now we have define the account details

Now time to configure the configuration database, here we are configuring into lab so we will select the first option, if you are installing more than 5 ADFS farm than you have to define the SQL server for configuration database.

Now time to review the configuration 


Now you have to check the pre-requite check

Now you have to open ADFS management console

Verify the ADFS configuration 


Now we need to add a non-claim aware relying party trust via wizard





Define the name and description
Now add your URl which you want to publish for me "https://mail.tech.com/owa/"

In this wizard it will ask for configure multi factor authentication, here we don't want to configure multi-factor authentication



In this wizard default check for "Open the edit Issuance authorization Rules dialog for this non claims-aware relying party trust when the wizard closes"
Once close we will see the edit rule wizard 
Now we are selecting "Permit all users' from drop down box



Now we can see the added rule in wizard 

Now time to test our  ADFS setup is working – you can go to the portal page – https://localhost/adfs/ls/idpinitiatedsignon.aspx

If you see this – continue on!



Configuring Exchange Server


Now we need to change the authentication type for the OWA virtual directory to Windows Integrated Auth (from forms) in order for the delegated authentication to work.

On Exchange Server E16, open the ECP (https://localhost/ecp )

Ignore the cert warning.

Select the OWA virtual directory


Select the "Use one or more standard authentication methods with Integrated Windows authentication"



Configuring WAP (Web Application Proxy) Server


From Server Manager you can add feature "Remote Access" and select required options, once installed add ADFS farm entry on host file in WAP server.


Thank select configuration WAP and follow the instruction


Add the ADFS server details and put the user name and password


Select the certificate


Now you can see the configuration details


Once you completed you can see the "Remote Access" in Server Manager

Open WAP management console





Select option "Active Directory Federation Services" for publishing the OWA

Select the Relying party

Now time to give the details for OWA

Verify the configuration details

Now you can see our configuration successfully published

Now same we have to do for ADFS with using the Pass through




Select option "Pass Through"


Give the details for ADFS



Now you can see both rules are reflecting into WAP console

Now you can see the certificate with help of MMC, which we import here


On DC, we need to configure Kerberos constrained delegation.


Testing


Now time to test publishing Outlook Web App to the Internet with AD FS Pre-Authentication, open the browser and type OWA URL- https://mail.tech.com/owa/


Now it will redirect to ADFS and asking for credential, give the credential


Once you provide the credential  you can see user's OWA is opened



Hope this articles will help you to understand how we can publish Exchange 2016 OWA via ADFS.

Thank You!

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