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Azure AD Connect–Upgrade to 1.1.533.0 and Change of Source Anchor to mS-DS-ConsistencyGuid

As I blogged yesterday, I upgraded our instance of Azure AD Connect to what was, at the time, the latest version, 1.1.524.0. Subsequently, Microsoft Security Advisory 4033453 was published indicating that an upgrade to version 1.1.533.0 was very strongly recommended.

As before, the upgrade went smoothly, however there were a couple of additional points of note during the upgrade:

  1. Running the Azure AD Connect msi gave the following warning (note that I appended the version number to the file name in this example):
    Azure AD Connect 1.1.533 SmartScreen Warning
    I’m assuming that this will be fixed shortly Smile
  2. Once the upgrade was complete, the following warning was shown:
    Source Anchor Using objectGUID
    ’Azure Active Directory is configured to use AD attribute objectGUID as the source anchor attribute. It is strongly recommended that you let Azure manage the source anchor for you. Please run the wizard again and select Configure Source Anchor.
    Re-running the wizard and selecting the ‘Configure Source Anchor’ task allowed Azure AD Connect to pick ‘mS-DS-ConsistencyGuid’ as the source anchor, and all configuration occurs automatically. At the end of the process however another warning is shown indicating that if ADFS is managed externally to Azure AD Connect, then claim rule changes are required to align the new Source Anchor with the value returned and users may not be able to log in unless these changes are made.
    In our case, this means that changes need to be made to the ADFS rules for the Office 365 relying party trust.. To make these changes, the following steps were taken:
    1. On the ADFS Server, expand ADFS, then Trust Relationships, then click on Relying Party Trusts. Right-click the ‘Microsoft Office 365 Identity Platform’ and select ‘Edit Claim Rules…’:
      O365 Relying Party Trust
    2. Select rule 1 and click the ‘Edit Rule…’ button.
    3. The original rule was:
      c:[Type == "http://schemas.microsoft.com/ws/2008/06/identity/claims/windowsaccountname"]
        => issue(store = "Active Directory", types = ("http://schemas.xmlsoap.org/claims/UPN", "http://schemas.microsoft.com/LiveID/Federation/2008/05/ImmutableID"), query = "samAccountName={0};userPrincipalName,objectGUID;{1}", param = regexreplace(c.Value, "(?<domain>[^\\]+)\\(?<user>.+)", "${user}"), param = c.Value);
      The only change that was required was to change objectGUID to mS-DS-ConsistencyGuid, I.e.
      c:[Type == "http://schemas.microsoft.com/ws/2008/06/identity/claims/windowsaccountname"]
        => issue(store = "Active Directory", types = ("http://schemas.xmlsoap.org/claims/UPN", "http://schemas.microsoft.com/LiveID/Federation/2008/05/ImmutableID"), query = "samAccountName={0};userPrincipalName,mS-DS-ConsistencyGuid;{1}", param = regexreplace(c.Value, "(?<domain>[^\\]+)\\(?<user>.+)", "${user}"), param = c.Value);
    4. Save the rule and double-check that you can authenticate to Office 365.

Some background to the issue of ImmutableID and the value to select for Source Anchor for Office 365 can be found at https://blog.msresource.net/2015/05/20/revisiting-the-microsoft-online-immutable-id-design-decision/

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