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Trustwave Knowledge Base

Home » Knowledgebase » WebMarshal » HOWTO: Applying Microsoft Tenant Restrictions with WebMarshal

HOWTO: Applying Microsoft Tenant Restrictions with WebMarshal

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This article applies to:

  • WebMarshal

Question:

  • How do I configure WebMarshal to apply Azure AD (Entra) tenant restrictions?

Background:

Microsoft tenant restrictions allow you to determine which tenancies of cloud applications can be accessed from within an organization (where the web access is forced through a gateway like WebMarshal). This feature can be used to control access to all apps that send the user to Azure AD for single sign-on.

Procedure:

  1. Add URL category Microsoft Auth Services
  2. Add the following URLs to this category (both HTTP and HTTPS):
    • login.microsoft.com
    • login.microsoftonline.com
    • login.windows.net
  3. Ensure that WebMarshal HTTPS inspection is enabled globally and HTTPS rules specify inspection for the category Microsoft Auth Services
  4. Create a standard rule 
    Where the URL is a member of Microsoft Auth Services 
    Rewrite Headers
    • Add a header to client requests Restrict-Access-To-Tenants with a comma separated list of tenant domains, for example: mycompany.onmicrosoft.com,contoso.com
    • Add a header to client requests Restrict-Access-Context with value of the Tenant ID of your domain (get this from Entra/Azure AD settings at https://entra.microsoft.com/ as described in the Microsoft article Restrict access to a tenant)
    • It is also possible to choose the users that this rule will apply to.
  5. Continue to name the rule for example Add MS Headers, and save the rule.
  6. Commit WebMarshal configuration.
Requests to the Microsoft services will have the headers added as specified.

Notes:

For more details of the tenant restriction feature, see the Microsoft article linked.

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