Azure AD Compatibility | SCIM for ASP.NET

There are interpretations and assumptions that the Azure AD SCIM Client makes based on the SCIM specfications that the SCIM component doesn't conform to by default. In an effort to provide compatibility with the Azure AD SCIM Client and the validation tool, a flag is availabe to enable compatiblity. This page details how to enable Azure AD integration compatibility, and what functionality is enabled by doing so.

Enabling Azure AD Compatibility

To enable Azure AD compatibility, set the EnableAzureAdCompatibility flag to true in the ScimServiceProviderConfigOptions passed in when calling AddScimServiceProvider

public void ConfigureServices(IServiceCollection services)
{
    services.AddScimServiceProvider(
        "/SCIM", 
        new ScimLicensingOptions("Demo", "eyJTb2xkRm9yIjowLjAsI .... "), 
        new ScimServiceProviderConfigOptions 
        {
            ...
            EnableAzureAdCompatibility = true
            ...
        }
    );
}

When the SCIM component is set to be compatibile with Azure AD, there are three features enabled.

Accepted PATCH syntax

Azure AD requests include the use of dot notation within property names to indicate property structure. Take the following as an example:

{
    "op": "replace",
    "value": {
        "userName": "ettie@sawayn.us",
        "name.honorificPrefix": "Anthony",
        "name.honorificSuffix": "Stanford",
        "urn:ietf:params:scim:schemas:extension:enterprise:2.0:User:employeeNumber": "G6G00I9RNZ0L",
        "urn:ietf:params:scim:schemas:extension:enterprise:2.0:User:manager.displayName": "DAV5Z5JXNJ47"
    }
}

The value above is equivalent to the following:

{
    "userName": "ettie@sawayn.us",
    "name": {
        "honorificPrefix": "Anthony",
        "honorificSuffix": "Stanford"
    }
    "urn:ietf:params:scim:schemas:extension:enterprise:2.0:User": {
        "employeeNumber": "G6G00I9RNZ0L",
        "manager": {
            "displayName": "DAV5Z5JXNJ47"
        }
    }
}

Extension Schema Validation

Extension schema validation is turned off when Azure AD compatibility is enabled. For example, when using the default resource for the in-memory SCIM store

public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
{
    services.AddScimServiceProvider("/SCIM", new ScimLicensingOptions("Demo", "eyJTb2xkRm9yIjowLjAsI .... "))
            .AddScimDefaultResourcesForInMemoryStore();
}

When the user model is registered, the EnterpriseUser extension schema is also registered. By default, the SCIM components expects that any full representation of a user includes the extension schema and properties. This means that if you intend to enable Azure AD compatibility, you also need to bear in mind that all requests made to the SCIM component will no longer validation the extension schemas if not present in the request.

The example below shows the expectations in both scenarios for when a create request is made to the /Users endpoint.

Default expectation

{
    "schemas": ["urn:ietf:params:scim:schemas:core:2.0:User", "urn:ietf:params:scim:schemas:extension:enterprise:2.0:User"],
    "userName": "bjensen",
    "externalId": "bjensen",
    "name": {
        "formatted": "Ms. Barbara J Jensen III",
        "familyName": "Jensen",
        "givenName": "Barbara"
    },
    "urn:ietf:params:scim:schemas:extension:enterprise:2.0:User": {
        "employeeNumber": "DSQR02DDMHBZ",
        "department": "AB2CJGNH1764",
        "costCenter": "CF9EOQ9JWPW4",
        "organization": "QWVM73ADSIYJ",
        "division": "RR364K2Z3A93"
    }
}

Expectation for compatibility

{
    "schemas": ["urn:ietf:params:scim:schemas:core:2.0:User"],
    "userName": "bjensen",
    "externalId": "bjensen",
    "name": {
       "formatted": "Ms. Barbara J Jensen III",
       "familyName": "Jensen",
       "givenName": "Barbara"
    }
}

ExternalId uniqueness in the InMemoryScimStore

When Azure AD provisions users and groups, it expects resources to be unique by their ExternalId. The implementation of this uniqueness must be carried out by the store. When the EnableAzureADCompatibility flag is set to true, the InMemoryScimStore implementation will require uniqueness based on the ExternalId property. If you have a custom store implementation, then you too must ensure that uniqueness is also dictated by this property.

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