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Triggering a Policy Based on Event Count

This section discusses two examples.

Note: The RADIUS_LOGIN_FAIL, TELNET_LOGIN_FAIL, and SSH_LOGIN_FAIL events are not valid JUNOS software events. They are illustrative for these examples.

Example 1

Configure an event policy called login. The login policy is executed if five login failure events (RADIUS_LOGIN_FAIL, TELNET_LOGIN_FAIL, or SSH_LOGIN_FAIL) are generated within 120 seconds. Take action by executing the login-fail.xsl event script, which disables the user account.



event-options {
    policy login {
        events [ RADIUS_LOGIN_FAIL TELNET_LOGIN_FAIL SSH_LOGIN_FAIL ];
        within 120 {
            trigger after 4;
        }
        then {
            event-script login-fail.xsl {
                destination some-dest;
            }
        }
    }
}

Table 24 shows how events add to the count.

Table 24: Event Count Triggers Policy

Event Number	Event	Time	Count	Order
1	RADIUS_LOGIN_FAIL	00:00:00	1	[1]
2	TELNET_LOGIN_FAIL	00:00:20	2	[1 2]
3	RADIUS_LOGIN_FAIL	00:02:05	2	[2 3]
4	SSH_LOGIN_FAIL	00:02:40	2	[3 4]
5	TELNET_LOGIN_FAIL	00:02:55	3	[3 4 5]
6	TELNET_LOGIN_FAIL	00:03:01	4	[3 4 5 6]
7	RADIUS_LOGIN_FAIL	00:03:55	5	[3 4 5 6 7]

The columns in Table 24 mean the following:

Event number—Event sequence number.
Event—Policy login events received by the event process (eventd).
Time—Time (in hh:mm:ss format) when eventd receives the event.
Count—The number of events received by eventd within the last 120 seconds.
Order—Order of events as received by eventd within the last 120 seconds.

At time 00:03:55, the value of count is more than 4; therefore, the login policy executes the login-fail.xsl script.

Example 2

Configure an event policy called login. The login policy is executed if five login failure events (RADIUS_LOGIN_FAIL, TELNET_LOGIN_FAIL, or SSH_LOGIN_FAIL) are generated within 120 seconds from username roger. Take action by executing the login-fail.xsl event script, which disables the roger user account.



event-options {
    policy p2 {
        events [ RADIUS_LOGIN_FAIL TELNET_LOGIN_FAIL SSH_LOGIN_FAIL ];
        within 120 {
            trigger after 4;
        }
        attributes-match {
            RADIUS_LOGIN_FAIL.username matches roger;
            TELNET_LOGIN_FAIL.username matches roger;
            SSH_LOGIN_FAIL.username matches roger;
        }
        then {
            event-script login.xsl {
                destination some-dest;
            }
        }
    }
}

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