Another advantage is that management of user authentication is consolidated in Azure AD. This eliminates the problem of having TOTP codes in an authenticator app that are bound to a particular device. Additionally, since the TOTP secret is stored in the YubiKey, the Yubico Authenticator can be loaded on many different devices to receive the code. The overall experience is similar to other TOTP solutions, with the advantage that the TOTP secret is never exposed, as it remains safely stored in the YubiKey.
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To authenticate, the user needs to open Yubico Authenticator, insert the YubiKey and then copy, or type in, the TOTP code in the VPN login prompt. However, having the Yubico Authenticator on the same computer does allow the user to easily copy and paste the TOTP code rather than having to manually type in the code. It can reside on another computer or a mobile device. Technically, the Yubico Authenticator does not need to be on the same device as the An圜onnect client. The Yubico Authenticator is used to generate TOTP codes based on the secret that is securely stored in the YubiKey. Additionally the Yubico Authenticator and the Cisco An圜onnect client needs to be installed on the client computers. NPS provides the RADIUS service which will be used by the RADIUS client on ASA. This approach requires installing Microsoft NPS Server along with the NPS Extension for Azure. The YubiKey, along with the Yubico Authenticator companion application, generates the OATH-TOTP passcode, which is presented to the MFA prompt within Cisco An圜onnect. In this approach, YubiKeys are deployed in Azure MFA as an OATH Token.
For Microsoft’s RADIUS implementation, the Network Policy Server (NPS) extension for Azure allows organizations to safeguard client authentication using cloud-based Azure Multi-Factor Authentication (MFA). Leveraging the Remote Authentication Dial-In User Service (RADIUS) protocol, Identity Providers (IDPs) interface with Cisco’s ASA to validate TOTP codes. This document focuses on a Microsoft Active Directory and Azure Active Directory centric implementation but the basic patterns can be applied to other vendor solutions.Īpproach 1: YubiKey TOTP with Azure AD and NPS ExtensionĪ common approach to provide multifactor authentication (MFA) is to use OATH Time-based One Time Passcodes (TOTP) as a second factor. This document outlines each approach and discusses each approach's advantages.
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Additionally, YubiKeys can be used for primary authentication without the need for a password with Smart Card or FIDO2 (SAML Clientless implementation) deployments. The YubiKeys can be used with TOTP (RADIUS and SAML implementations) for second factor authentication. There are many different approaches to implementing YubiKeys with Cisco VPN based on the ASA configuration. Cisco Adaptive Security Appliance (ASA) VPN deployments can take advantage of the strong authentication that YubiKeys provide.
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