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I do not understand the following thing in SharePoint Provider Hosted Add-In development:

When you create a SharePoint Provider Hosted Add-In you create a ClientId/-Secret and also for High Trust Apps a SSL certificate on the IIS with a password.

My question is:

Do i need to create for each of my provider hosted applications a dedicated SSL certificate and provide it with the password to the developer? And also always need to create a separate ClientId and -secret for each app?

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For SharePoint Online (low-trust apps) and on-premise in low-trust scenario:

  • for every new addin you need new ClientId and ClientSecret

  • no need for SSL certificates (since we are using low-trust and OAuth in order to obtain access token)

For SharePoint on-premise (2013, 2016, S2S authentication, high-trust):

  • for every new addin you need new ClientId

  • no need for ClientSecret, since you are using S2S authentiation based on certifcate

  • you may use one SSL certificate for all your high-trust addins (this kind of certificate registered with -IsTrustBroker flag), or you can create separate certificate for every addin. More info here

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    This blog post goes into some detail about how Provider-hosted apps get the context from SharePoint. Describes the role of the secret and the certificate in low and high trust apps. – wjervis Nov 14 '16 at 14:15
  • I found on this website blogs.msdn.microsoft.com/shariq/2013/05/07/… that there is needed a dedicated url for the web host? Maybe i dont need this instead i need the HighTrustConfig-ForSingleApp.ps1 script from MSDN for using a shared cert? – BOG Nov 14 '16 at 14:48
  • Sorry, I'm not quite understand you. In case if your addin is a web application, then of course you need dedicated url. For shared certificate you need to use HighTrustConfig-ForSharedCertificate.ps1 and HighTrustConfig-ForSingleApp.ps1 for certificate per addin – Sergei Sergeev Nov 14 '16 at 14:56
  • @Kai: thanks. i will try the scripts within the next hours. You mean HighTrustConfig-ForSharedCertificate.ps1 OR HighTrustConfig-ForSingleApp.ps1 !? – BOG Nov 14 '16 at 15:56
  • It depends on your strategy. The link I sent you - Deciding between using one certificate or many for high-trust SharePoint Add-ins describes pros and cons for each strategy. – Sergei Sergeev Nov 14 '16 at 15:58

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