In the case of Yubikey, there are also some duplicates since the AAGUID does not refer to the interface of the key (e.g.
It is assigned by the manufacturer of the key, whereby it is sufficient for the manufacturer to define one AAGUID per model series. The Authenticator Attestation Globally Unique ID is a unique identifier with a length of 128 bits. For this purpose, Azure AD uses the public keys stored in the metadata statement or checks whether the signature was signed by a certificate (trust chain) specified in the metadata statement. The Azure AD can use this signature to verify that the FIDO2 key really matches the specified model, preventing a FIDO2 key from just pretending to support all requirements. This private key is written to the FIDO2 Security Key by the manufacturer during production and is not deleted even during a full reset of the key. In addition to the AAGUID, this includes a signature that is created with the private key of the Attestation Certificate. If the key supports all requirements, in this case attestation, the FIDO2 key sends additional information back to Azure AD. If no supported security key is found, registration is not possible. For each key model, the vendor assigns an Authenticator Attestation Globally Unique ID which later identifies the exact model.ĭuring the registration process, Azure AD requests certain features of the key using a policy statement. In order for the FIDO2 key to support this at all, the manufacturer must submit a metadata statement with the supported features of the FIDO2 security key during certification, which is then distributed by the FIDO2 Alliance. If attestation is enforced, the FIDO2 key must identify itself to the Azure AD (Relying Party) during initial registration. However, since it is also not possible to register a key for the user, “No” would effectively prevent the use of new keys. If this setting is set to “No”, it is no longer possible for a user to add a FIDO2 security key. This setting must remain set to “Yes” as of 07/2021. Enforce key restrictions - Restrict specific keys (Allow/Block).Because for FIDO2 Security Keys as a login method, some additional settings can be configured in the Azure Portal. In the last blogpost of the series it gets a bit more technical.
PowerShell administration without a password.Windows 10 device onboarding and Windows Hello for Business.
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