Overview

Two Factor authentication module example for Shibboleth IdP v3. The module doesn't do anything complex, just confront the token provided by the user during login with a constant token in the idp.properties configuration file.

This module is intended to show how the login process for Shibboleth could be modified to include custom modules during login.

Installation

The installation for this module goes as follows:

1. copy all files in the IDP_HOME folder to your $IDP_HOME folder

2. build the webapp so that the new jar developed will be added to the libraries for the webapplication by executing the command $IDP_HOME/bin/build.sh

3. edit idp.properties located at $IDP_HOME/conf/idp.properties, adding the following to the bottom of the file:

   twofactor.token = 123456789

4. edit conditions-flow.xml located at $IDP_HOME/flows/authn/conditions/conditions-flow.xml, adding the following to the top of the <action-state id="ValidateUsernamePassword"> section:

   <!-- Enable Two-Factor Authentication -->
   <evaluate expression="ValidateUsernamePassword" />
   <evaluate expression="'twofactor'" />
   <transition on="twofactor" to="TwoFactorAuth" />
   <!-- End Two-Factor Authentication -->

   also, add the following just before the closing </flow> tag:

   <subflow-state id="TwoFactorAuth" subflow="authn/twofactor">
      <input name="calledAsSubflow" value="true" />
      <transition on="proceed" to="proceed" />
   </subflow-state>

5. edit general-authn.xml located at $IDP_HOME/conf/authn/general-authn.xml to add the new authentication context for requesting a token:

   <bean id="authn/Password" parent="shibboleth.AuthenticationFlow"
       p:passiveAuthenticationSupported="true"
       p:forcedAuthenticationSupported="true">
      <property name="supportedPrincipals">
          <list>
              <bean parent="shibboleth.SAML2AuthnContextClassRef"
                  c:classRef="urn:oasis:names:tc:SAML:2.0:ac:classes:PasswordProtectedTransport" />
              <bean parent="shibboleth.SAML2AuthnContextClassRef"
                  c:classRef="urn:oasis:names:tc:SAML:2.0:ac:classes:Password" />
              <bean parent="shibboleth.SAML2AuthnContextClassRef"
                  c:classRef="urn:oasis:names:tc:SAML:2.0:ac:classes:Token" />
              <bean parent="shibboleth.SAML1AuthenticationMethod"
                  c:method="urn:oasis:names:tc:SAML:1.0:am:password" />
          </list>
      </property>
   </bean>

6. restart your application server.