Impersonation within Azure Function or Custom Connector when using AAD authentication

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In the earlier blog posts, we discussed setting up an Azure function with AAD authentication and then creating a custom connector for the Azure function that also requires AAD authentication to make a connection to the connector.

Given that the Azure function is configured for AAD authentication in the Authentication / Authorization section of the function as shown below

Azure Function or Custom Connector when using AAD authentication

Now that we have provided for AAD authentication that requires a user login, it would be good if all operations are executed within the context of the same user.

Within your Azure function, you can get the details of the logged-in user using the ClaimsPrincipal

ClaimsPrincipal principal = req.HttpContext.User;

if (principal.Identity != null)

{

log.LogInformation(“Claims identity ” + principal.Identity.Name);

}

if (principal.Claims != null)

{

foreach (Claim c in principal.Claims)

{

log.LogInformation(“CLAIM TYPE: ” + c.Type + “; CLAIM VALUE: ” + c.Value + “</br>”);

}

 }

In the console, you can see all the claims returned

Azure Function or Custom Connector when using AAD authentication

One of the claims returned is AADID

Azure Function or Custom Connector when using AAD authentication

Read this specific claim value

Claim claim = principal.Claims.FirstOrDefault(c => c.Type.Contains(“objectidentifier”));

string aadobjid = “”;

if (claim != null)

{

aadobjid = claim.Value;

log.LogInformation(“aadobjid = ” + aadobjid);

}

Every CRM User that we create has an associated AADID stored along which is this objectid.

Set this to the cds client object we have created for impersonation

//establish connection with CDS

CdsServiceClient client = new CdsServiceClient(connectionString);

if (!string.IsNullOrEmpty(aadobjid))

{

client.CallerAADObjectId = new Guid(aadobjid);

}

Do note if you run a WhoAmI request – it still returns the id of the original credentials used for establishing the connection.

However, when you create a record, you will notice that the owner of the new record is the same user that had logged in to the connector.

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