Skip to main content

Modifying your EWS WSDL Proxy Code for Modern Authentication

This is a follow-on from my last post on Modifying your EWS Managed API code to use Hybrid Modern Authentication against OnPrem Mailboxes . If instead of the EWS Managed API you are using EWS Proxy Code (generated from the EWS WSDL) and you want to migrate it to using Modern Authentication for Office365 and/or Hybrid here's a method you can use using the MSAL Authentication library.

Unlike the EWS Managed API the WSDL generated proxy classes and specifically the ExchangeServiceBinding class doesn't have any provision to use Token Credentials. One way of implementing this in .NET is to take advantage of  Polymorphism and create a new class that is derived from the ExchangeServiceBinding class and then override the method GetWebResponse from this class (which is actually derived from the SoapHttpClientProtocol class which contains the actual method we are going to override https://docs.microsoft.com/en-us/dotnet/api/system.web.services.protocols.soaphttpclientprotocol.getwebrequest?view=netframework-4.8 )

At the same time we can also add the X-AnchorMailbox header into the request which is also recommended for any Exchange Online requests you make. And because this method is called before every EWS Request we can place our Token Refresh code in there. In this example I'm using which uses the MSAL all you need to include is code that fetches the token from the TokenCache, this will trigger a Token Refresh if need or ultimately throw to Interaction if the Refresh Token isn't available. So here is a basic C# Console App that can do Hybrid/Modern Auth discover using the MSAL library. If you want the project files you can download them from here



 

Popular posts from this blog

Using the MSAL (Microsoft Authentication Library) in EWS with Office365

Last July Microsoft announced here they would be disabling basic authentication in EWS on October 13 2020 which is now a little over a year away. Given the amount of time that has passed since the announcement any line of business applications or third party applications that you use that had been using Basic authentication should have been modified or upgraded to support using oAuth. If this isn't the case the time to take action is now. When you need to migrate a .NET app or script you have using EWS and basic Authentication you have two Authentication libraries you can choose from ADAL - Azure AD Authentication Library (uses the v1 Azure AD Endpoint) MSAL - Microsoft Authentication Library (uses the v2 Microsoft Identity Platform Endpoint) the most common library you will come across in use is the ADAL libraries because its been around the longest, has good support across a number of languages and allows complex authentications scenarios with support for SAML etc. The

How to test SMTP using Opportunistic TLS with Powershell and grab the public certificate a SMTP server is using

Most email services these day employ Opportunistic TLS when trying to send Messages which means that wherever possible the Messages will be encrypted rather then the plain text legacy of SMTP.  This method was defined in RFC 3207 "SMTP Service Extension for Secure SMTP over Transport Layer Security" and  there's a quite a good explanation of Opportunistic TLS on Wikipedia  https://en.wikipedia.org/wiki/Opportunistic_TLS .  This is used for both Server to Server (eg MTA to MTA) and Client to server (Eg a Message client like Outlook which acts as a MSA) the later being generally Authenticated. Basically it allows you to have a normal plain text SMTP conversation that is then upgraded to TLS using the STARTTLS verb. Not all servers will support this verb so if its not supported then a message is just sent as Plain text. TLS relies on PKI certificates and the administrative issue s that come around certificate management like expired certificates which is why I wrote th

A walk-though using the Graph API Mailbox reports in Powershell

Quite recently the Reporting side of the Graph API has moved in GA from beta, there are quite a number of reports that can be run across various Office365 surfaces but in this post I'm going to focus on the Mailbox related ones. Accessing Office365 Reports using Powershell is nothing new and has been available in the previous reporting endpoint  https://msdn.microsoft.com/en-us/library/office/jj984326.aspx however from the end of January many of these cmdlets are now being depreciated in favour of the Graph API  https://msdn.microsoft.com/en-us/library/office/dn387059.aspx . Prerequisites  In comparison to using the Remote PowerShell cmdlets where only the correct Office365 Admin permissions where needed, to use the new Graph API reports endpoint you need to use OAuth for authentication so this requires an Application Registration  https://developer.microsoft.com/en-us/graph/docs/concepts/auth_overview  that is then given the correct oAuth Grants to use the Reports EndPoin
All sample scripts and source code is provided by for illustrative purposes only. All examples are untested in different environments and therefore, I cannot guarantee or imply reliability, serviceability, or function of these programs.

All code contained herein is provided to you "AS IS" without any warranties of any kind. The implied warranties of non-infringement, merchantability and fitness for a particular purpose are expressly disclaimed.