IPAddressAuthnConfiguration

Current File(s): conf/authn/ipaddress-authn-config.xml, conf/authn/authn.properties (V4.1+)
Format: Native Spring, Properties (V4.1+)

1 Overview
2 Enabling Module (V4.1+)
3 General Configuration
4 Reference

Overview

The authn/IPAddress login flow applies the user agent's address to a mapping of address range(s) to username(s) as a form of pseudo-authentication. This isn't the same as authorizing access to something by address, because a real user identity is produced as a result.

This flow is implemented as a "fall-through" so that under normal error conditions (no address available, no valid mapping), it passes control back to select another flow to run, so it can easily be combined with other methods. Of course, as shipped, the IdP will communicate that the form of authentication done was not based on a password.

Enabling Module (V4.1+)

For V4.1+, configuring and using this feature requires that you first enable the "idp.authn.IPAddress" module if it isn't already enabled. Systems upgraded from older releases generally come pre-enabled due to the prior state of the configuration tree.

(Windows)
C:\opt\shibboleth-idp> bin\module.bat -t idp.authn.IPAddress || bin\module.bat -e idp.authn.IPAddress
 
(Other)
$ bin/module.sh -t idp.authn.IPAddress || bin/module.sh -e idp.authn.IPAddress

General Configuration

Use conf/authn/ipaddress-authn-config.xml to configure this flow.

The shibboleth.authn.IPAddress.Mappings bean is the map between usernames and lists of CIDR address ranges. An IP CIDR Calculator may help in calculating the CIDR notation for an IP range. Note that en empty map, which is the default, essentially makes this flow non-operable in practice.

The following example maps only the IPv4 and IPv6 localhost addresses to the name "jdoe":

    <util:map id="shibboleth.authn.IPAddress.Mappings">
        <entry key="jdoe">
            <list>
                <value>127.0.0.1/32</value>
                <value>::1/128</value>
            </list>
        </entry>
    </util:map>

The shibboleth.authn.IPAddress.Transforms bean allows for address transformations before comparing them to the address ranges, essentially a kind of on-the-fly address translation. A transform is a Pair object containing a regular expression and a replacement expression.

Reference

The beans defined in authn/ipaddress-authn-config.xml follow:

Bean ID	Type	Default	Description

Bean ID	Type	Default	Description
shibboleth.authn.IPAddress.Mappings	Map<String,List<IPRange>>	Empty Map	The entry values are a list of CIDR address range strings to map to the username in the entry key
shibboleth.authn.IPAddress.Transforms	List<Pair<String,String>>		Pairs of regular expressions and replacement expressions to apply to the username
shibboleth.authn.IPAddress.resultCachingPredicate	Predicate<ProfileRequestContext>		An optional bean that can be defined to control whether to preserve the authentication result in an IdP session
shibboleth.authn.IPAddress.addDefaultPrincipals	Boolean	true	Whether to add the content of the `supportedPrincipals` property of the underlying flow descriptor to the resulting Subject

The beans defined in authn/ipaddress-authn-config.xml follow:

Bean ID	Type	Default	Description

Bean ID	Type	Default	Description
shibboleth.authn.IPAddress.Mappings	Map<String,List<IPRange>>	Empty Map	The entry values are a list of CIDR address range strings to map to the username in the entry key
shibboleth.authn.IPAddress.Transforms	List<Pair<String,String>>		Pairs of regular expressions and replacement expressions to apply to the username
shibboleth.authn.IPAddress.resultCachingPredicate	Predicate<ProfileRequestContext>		An optional bean that can be defined to control whether to preserve the authentication result in an IdP session

The general properties configuring this flow via authn/authn.properties are:

Name	Default	Description

Name	Default	Description
idp.authn.IPAddress.order	1000	Flow priority relative to other enabled login flows (lower is "higher" in priority)
idp.authn.IPAddress.nonBrowserSupported	true