HP-UX AAA Server A.08.01 administrator's guide (T1428-90072, May 2010)

Table Of Contents
Figure 20-17 Server Properties: Modify Property (Event Timestamp)
5. Enter the time window (in seconds) for which the incoming Event-Timestamp
attribute is valid.
Message-Authenticator
The Message-Authenticator attribute provides additional protection to RADIUS
messages from fraudulent messages and message tampering. You can use the
Message-Authenticator attribute to authenticate and integrity-protect the Dynamic
Authorization messages. The HP-UX AAA Server discards all incoming messages that
include an invalid Message-Authenticator attribute.
The verification of the Message-Authenticator attribute occurs only if the attribute
is present in the incoming message. If the attribute is absent, the attribute is ignored.
To ensure that the Message-Authenticator checking occurs, add the following
lines in the /etc/opt/aaa/client-reply-ingress.grp client reply ingress policy
file. For more information on Message-Authenticator, see RFC 2869.
if( count(Message-Authenticator) = 0 )
{
exit "NAK"
}
To add the Message-Authenticator attribute in the outgoing messages, add the
following line in the /etc/opt/aaa/client-request-egress.grp client request
egress policy file.
insert Message-Authenticator = "0000000000000000"
The mentioned line adds an empty Message-Authenticator value to the request.
The HP-UX AAA Server calculates the correct Message-Authenticator value and
replaces the existing value before sending the message.
NOTE: The length of the Message-Authenticator string must be 16.
Reverse Path Forwarding Check for Proxies
The Dynamic Authorization proxy functionality can perform Reverse Path Forwarding
(RPF) check to verify that a Dynamic Authorization request originated from an
authorized Dynamic Authorization Client (DAC). The HP-UX AAA Server extracts the
realm from the user name and determines the corresponding HP-UX AAA Servers in
the realm routing tables configured in the /etc/opt/aaa/authfile or the Proxies
324 Configuring the HP-UX AAA Server for Dynamic Authorization