How can my managed identity backed azure function access sharepoint?

Question

I have an azure function, that is backed by managed identity.

On the same AD there is office 365 with a SharePoint site called "demonews".

How do I add permissions/add the managed identity to the group "demonews" such it can access the SharePoint API?

I tried Add Member on SharePoint site, I tried on AD Group to add a member. The dropdown do not find a managed identity.

Answer 1

I think this what you are looking for:

https://finarne.wordpress.com/2019/03/17/azure-function-using-a-managed-identity-to-call-sharepoint-online/

Essentially you will get the azure service principal for office 365 SharePoint as well as the roles.

#Get the sharePoint principal $sharePoint = (Get-AzureADServicePrincipal -SearchString “Office 365 SharePoint”).ObjectId

#Get the Roles for that principal $appRoles = Get-AzureADServicePrincipal -SearchString “Office 365 SharePoint” | %{$_.AppRoles}

#Find the specific role $appRole = AppRoles.Where({ $_.Value -eq "Sites.Manage.All" }

#You will also need to get the service principal for your function app

#Get the function app object id $myfunctionapp = (Get-AzureADServicePrincipal -SearchString “myfunctionapp”).ObjectId

#assign the role to the MSI for the sharepoint resource New-AzureADServiceAppRoleAssignment -ObjectId $myfunctionapp -PrincipalId $myfunctionapp -ResourceId $sharePoint -Id $appRole

You can then use the local MSI endpoint and secret to obtain a token.