D-Link DWS-3160-24TC DWS-3160 Series CLI Reference Guide - Page 981
Certification Overview and Usage In the Wireless System, Certificate Generation on the Access Point
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DWS-3160 Series Gigabit Ethernet Unified Switch CLI Reference Guide which the AP may establish a connection. The certificates are distributed when the mutual authentication feature is enabled, during AP and Switch provisioning, and triggered by an administrator command. The X.509 mutual certificate exchange is the only mechanism for peer Switches to authenticate with each other because Switches don't support pass-phrase authentication. Note that if the wireless Switch is currently managed by a cluster controller, then any provisioning request toward this Switch will fail. When the X.509 mutual authentication is enabled the AP and peer Switch discovery is slower than when this feature is disabled because certificates are exchanged during the TLS connection setup. Certification Overview and Usage In the Wireless System: The TLS connection has two sides: a client side initiates the connection and the server side accepts the connection. In a Wireless System, the APs act only as TLS clients, and Switches act as either TLS clients or TLS servers. The Switch acts as a TLS client when it establishes a connection to a peer Switch. The TLS protocol supports client verification of server certificates and mutual certificate verification. The Wireless System configures the TLS session to use mutual certificate verification when the mutual authentication mode is enabled. When the mutual authentication mode is disabled, the Wireless System uses anonymous cipher and disables certificate exchange and verification. In order to verify the certificate each device generates a private key and an X.509 certificate. The private key is kept on the device and is not given out to other Switches or APs. The certificate contains a matching public key. The device certificate is given out to other devices in the wireless system. Data encrypted with the public key using the device's certificate can be decrypted with the device's private key. The certificates are encoded using PEM format, which is a Base64 encoded file. The Base64 encoding uses printable ASCII characters to represent binary data. Before the certificate files can be used for certificate validation they are loaded into the OpenSSL library. Each wireless device has a copy of a certificate of the device with which it needs to communicate. During TLS connection establishment the Wireless devices compare the certificate received on the connection setup with all available loaded certificates for other wireless devices. If a matching certificate is found then the certificate verification succeeds. The verification function does not attempt to correlate the IP address of the device with the certificate and it does not check the certificate expiration date. The TLS connections are configured to validate the certificates only on the initial connection setup. The connection reauthentications don't trigger new certificate validation attempts. Certificate Generation on the Access Point: 977
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