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A machine credential can be presented upon machine boot, and a user credential presented when the user logs into the machine after the boot phase. Note: In the world of 802.1x, and Microsoft Windows, the 802.1x supplicant is implemented with a dual-level authentication. This might be useful information if (as some organizations implement) mutual certificate exchange is deemed sufficient for machine-based authentication. This means that when using a sniffer on a wired port, or in the wireless airspace, the certificates that are exchanged can be captured. In the Wireless network context using WPA2-Enterprise mode, all of the EAP transactions occur in cleartext as the pairwise master key calculation for AES based encryption cannot be completed before authentication credentials are exchanged.
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In some organizations, credentials are not even validated and the mere exchange of mutually signed certificates is sometimes considered sufficient. After the certificate exchange process completes with an appropriate chain of trust validation, authentication credentials may be presented across the TLS tunnel.
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The client supplicant presents a client certificate which is validated by the server, and then the RADIUS server presents a server certificate which is validated by the client. Once the tunnel is established, MSCHAPv2 is used to send username, and password credentials to the RADIUS server.ĮAP-TLS is very similar to EAP-PEAP only that mutual TLS certificate authentication is performed. The client/supplicant must then validate the certificate chain of trust before establishing the TLS tunnel. The TLS tunnel is established using a server presented certificate delivered using RADIUS protocol to the authenticator (switch or wireless controller), and then delivered using EAP to the 802.1x client/supplicant.
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It is fairly common for EAP-PEAP to be used for most authentication in enterprise networks, although EAP-TLS can be used also.ĮAP-PEAP (EAP-PEAPv0) is the most common form of EAP in use whereby MSCHAPv2 encoded credentials are protected inside of a TLS tunnel. EAP is used both in a wired network context as well as a wireless network context. A network can authenticate a client workstation using the 802.1X and Extensible Authentication Protocol (EAP) using multiple different methods.
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