SimplePostLoginC14NConfiguration

Current File(s): conf/c14n/subject-c14n.properties, conf/c14n/subject-c14n.xml
Format: Properties, Native Spring

1 Overview
2 Configuration
- 2.1 Method Settings
- 2.2 Enabling this Method
3 Reference

Overview

The “simple” post-login subject c14n method does a routine extraction of a singke UsernamePrincipal from the Java Subject and returns it as the canonincal principal name for the subject. It also supports some optional transforms to apply to the name.

This flow will succeed if and only if the input Java Subject contains exactly one UsernamePrincipal in its collection of Principals.

Configuration

Method Settings

Use conf/c14n/subject-c14n.properties to configure this method.

If your system has been upgraded, you may continue to use conf/c14n/simple-subject-c14n-config.xml as before, or you may remove it, while ensuring the new properties are being loaded.

The regular expression replacement feature is the only bit remaining that still requires XML and you may define that bean, if needed, in conf/c14n/subject-c14n.xml

By default, the only transform applied is a trim of leading or trailing whitespace. Case-folding and regular expression replacements can be added, per the reference below.

Enabling this Method

In V5.2+, this method is enabled by setting a per-login-flow property in conf/authn/authn.properties that references it. The default bean ID of this method is “c14n/simple”, so enabling it for a login flow looks like:

idp.authn.Password.c14n.flows = c14n/simple

It is possible to configure two instances of this method at the same time with different settings. The default instance is configured with a set of global properties, so defining a second instance of it with different settings requires adding a bean to conf/c14n/subject-c14n.xml. This bean can be defined at the top level of the file and needs a unique ID to reference in the login flow property example above. It does not have to carry the “c14n/” prefix but this is useful for clarity.

As an example, to define a second instance with a rule to lower case the input (without applying that same rule to the default instance of course):

<bean id="c14n/simple-lower" parent="c14n/simple"
  p:lowercase="true" />

That then allows you to reference “c14n/simple-lower” in a login flow’s property as above.

In older versions, this method is generally enabled for you by default by virtue of a reference to the bean in the shibboleth.PostLoginSubjectCanonicalizationFlows list in conf/c14n/subject-c14n.xml:

    <util:list id="shibboleth.PostLoginSubjectCanonicalizationFlows">
        <ref bean="c14n/simple" />
    </util:list>

Most often it shows up last in the list and doesn’t hurt anything to leave enabled, but the reference could be removed if not in use.

Reference

Bean ID	Type	Description

Bean ID	Type	Description
c14n/simple	SimpleSubjectCanonicalization	Built-in instance of this method, auto-configured by properties and other beans as described. V5.2+ allows reuse of this bean as a parent to define additional instances of this method with different settings.
shibboleth.c14n.simple.Transforms	Pair<String,String>	Pairs of regular expressions and replacement expressions to apply to the username

The following properties are commented out by default in conf/c14n/subject-c14n.properties:

Name	Type	Default	Description

Name	Type	Default	Description
idp.c14n.simple.lowercase	Boolean	false	Whether to lowercase the username
idp.c14n.simple.uppercase	Boolean	false	Whether to uppercase the username
idp.c14n.simple.trim	Boolean	true	Whether to trim leading and trailing whitespace from the username

Identity Provider 5