Adaptive Authentication

Adaptive authentication in CAS allows you to accept or reject authentication requests based on certain characteristics of the client browser and/or device. When configured, you are provided with options to block authentication requests from certain locations submitted by certain browser agents. For instance, you may consider authentication requests submitted from London, UK to be considered suspicious, or you may want to block requests that are submitted from Internet Explorer, etc.

Adaptive authentication can also be configured to trigger multifactor based on specific days and times. For example, you may wish to trigger multifactor on select days or if the current hour is after 11pm or before 6am. Each rule block may be assigned to an mfa provider where successful matching of rules allows for the multifactor trigger to execute.


To see the relevant list of CAS properties, please review this guide.

To enable adaptive authentication, you will need to allow CAS to geo-locate authentication requests. To learn more, please see this guide

IP Intelligence

CAS provides you with the capability to examine the client IP address and decide whether access should be granted. This may be useful to detect bot, proxy or VPN traffic and protect your deployment from fraud, automated attacks, crawlers, etc.

The result of the IP address examination may either ban and request the request, allow it to go through, or present a score to indicate the probability of an IP address that may be questionable. If the result is ranked score, it will be compared against the configured risk threshold to determine whether the request may proceed.

Banned IP address can either be defined as patterns in the CAS settings, or they may be examined using the listed strategies below.


The client IP address is submitted to a REST endpoint as the header clientIpAddress under a GET request. The expected result status codes are the following:

Code Description
401, 403 IP address is banned and the request will be rejected.
200, 202 IP address is allowed and the request may proceed.
All Others Response body is expected to contain a score between 1 and 0, (1=Banned and 0=Allowed), indicating IP address suspiciousness.


The client IP address may be examined using a Groovy script whose outline should match the following:

import org.apereo.cas.authentication.principal.*
import org.apereo.cas.authentication.*
import org.apereo.cas.util.*

def run(Object[] args) {
    def requestContext = args[0]
    def clientIpAddress = args[1]
    def logger = args[2]"Client ip address provided is ${clientIpAddress}")
    if (ipAddressIsRejected())
        return IPAddressIntelligenceResponse.banned()
    return IPAddressIntelligenceResponse.allows()

BlackDot IP Intel

Please see this link for more info. A valid subscription is required for large query counts.

Usage Warning!

This is a free service, primarily useful for development, testing and demos. Production deployments of this service require a subscription that can handle the expected query count and load.

Note that a valid email that is checked frequently must be used in the contact field or else the service might be disabled without notice. Furthermore, DO NOT exceed more than 500 queries per day & 15 queries per minute. See FAQ for further information.

Risk-based Authentication

CAS is able to track and examine authentication requests for suspicious behavior. To learn more, please see this guide.