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| Oracle Solaris Cluster Data Services Developer's Guide Oracle Solaris Cluster 4.1

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## How the CRNP Authenticates Clients and the Server

The server authenticates a client by using a form of TCP wrappers. The source IP address of the registration message, which is also used as the callback IP address on which events are delivered, must be in the list of allowed clients on the server. The source IP address and registration message cannot be in the denied clients list. If the source IP address and registration are not in the list, the server rejects the request and issues an error reply to the client.

When the server receives an `SC_CALLBACK_REG` `ADD_CLIENT` message, subsequent `SC_CALLBACK_REG` messages for that client must contain a source IP address that is the same as the source IP address in the first message.

If the CRNP server receives an `SC_CALLBACK_REG` that does not meet this requirement, the server performs one of the following actions:

- Ignores the request and sends an error reply to the client

- Assumes that the request comes from a new client, depending on the contents of the `SC_CALLBACK_REG` message

This security mechanism helps to prevent denial of service attacks, where someone attempts to unregister a legitimate client.

Clients should also similarly authenticate the server. Clients need only accept event deliveries from a server whose source IP address and port number are the same as the registration IP address and port number that the client used.

Because clients of the CRNP service are supposed to be located inside a firewall that protects the cluster, the CRNP does not include additional security mechanisms.

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