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  • Configuring a Shibboleth Identity Provider to join the Tuakiri Federation

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We recommend first registering a Test system into Tuakiri-TEST and after successful testing, register a production-ready system into Tuakiri Production.

Table of Contents
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Federation Details

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  • Register an Organisationfor your institution (if not already registered)
    • For Contact Details, do not use a shared mailbox, alias or mailing list when entering an email address because the confirmation email contains a single-use link and may cause some confusion should more than one person attempt to use it
    • For Organization Name, enter your DNS domain name.
    • For Organization Display Name, enter your actual organization name.
  • Wait for the Organisation to be approved
  • Register your IdP under that Organisation
    • Provide the Contact Details for the IdP admin (again, do not use a shared mailbox)
    • Select the organisation and provide a name and description for your IdP
    • Enter the base URL for your IdP (https://idp.example.org)
    • Enter the PEM encoded certificate used by your IdP for signing Shibboleth assertions (the default is $IDP_HOME/credentials/idp.pem).
    • Select the attributes the IdP will be able to release to the federation
    • Select supported NameID formats. By default, urn:oasis:names:tc:SAML:2.0:nameid-format:transient is already selected. If supporting SAML1, select also urn:mace:shibboleth:1.0:nameIdentifier.
    • Submit the details and wait for your IdP to be approved.
    • After having your IdP registration approved, click on the link sent to you to become an Administrator of the IdP's registration.

      Note
      titleConfirmation email
      • It is important to click on the link in the confirmation email, as this makes the recipient of the email an administrator of the Identity Provider being registered in the Tuakiri Federation Registry.
        • The link in the confirmation email can only be used once.
        • Same applies for the link sent for the Organization registration.
    • If supporting SAML1, define the SAML1 endpoints for your IdP.

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NOTE: Check what your IdP home directory is: the directory is typically called shibboleth-idp - and on Debian and Ubuntu systems, it's commonly /usr/local/shibboleth-idp, while on RedHat and CentOS it's /opt/shibboleth-idp. The snippets below are referring to the IdP home directory as $IDP_HOME

  • Download the metadata signing certificate into $IDP_HOME/credentials:

    No Format
    wget http://directory.tuakiri.ac.nz/metadata/tuakiri-metadata-cert.pem -O $IDP_HOME/credentials/tuakiri-metadata-cert.pem
  • In $IDP_HOME/conf/relying-party.xml
    • Add the following snippet into the ChainingMetadataProvider:

      Code Block
      xml
      xml
               <!-- Tuakiri -->
              <metadata:MetadataProvider id="Tuakiri" xsi:type="metadata:ResourceBackedMetadataProvider">
                <metadata:MetadataFilter xsi:type="metadata:ChainingFilter" xmlns="urn:mace:shibboleth:2.0:metadata">
                  <metadata:MetadataFilter xsi:type="metadata:SignatureValidation" xmlns="urn:mace:shibboleth:2.0:metadata"
                                  trustEngineRef="shibboleth.MetadataTrustEngine"
                                  requireSignedMetadata="true" />
                </metadata:MetadataFilter>
                <metadata:MetadataResource xsi:type="resource:FileBackedHttpResource"
                                url="http://directory.tuakiri.ac.nz/metadata/tuakiri-metadata-signed.xml"
                                file="/opt/shibboleth-idp/metadata/tuakiri-metadata.xml" />
              </metadata:MetadataProvider>
      
    • And add the following snippet into the <security:TrustEngine id="shibboleth.MetadataTrustEngine" xsi:type="security:StaticExplicitKeySignature">element:

      Code Block
      xml
      xml
               <security:Credential id="Tuakiri-FederationCredentials" xsi:type="security:X509Filesystem">
                  <security:Certificate>/opt/shibboleth-idp/credentials/tuakiri-metadata-cert.pem</security:Certificate>
              </security:Credential>
      
      Note

      Remember to uncomment the <security:TrustEngine id="shibboleth.MetadataTrustEngine" xsi:type="security:StaticExplicitKeySignature"> element if it is still commented out (it is commented out in the default configuration).

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  • Contact the federation administratorsand request a URL for the Attribute Filter for your IdP.
    • In the request, please include:
      • The name (hostname or entityID) of your IdP
      • An email address that should receive notifications whenever the attribute filter changes (these are notifications only, no action will be required).
    • The attribute filter may have to be manually added to the list of attribute filters published. Once created, the URL will have the form of: http://directory.tuakiri.ac.nz/attribute-filter/<institution-domain>.xml
  • Add the following entry into <srv:Service id="shibboleth.AttributeFilterEngine" in $IDP_HOME/conf/service.xml(note that the URL varies for each IdP and has to be obtained from the federation administrators):

    Code Block
    xml
    xml
             <srv:ConfigurationResource xsi:type="resource:FileBackedHttpResource"
                                  url="http://directory.tuakiri.ac.nz/attribute-filter/<institution-domain>.xml"
                                  file="/opt/shibboleth-idp/conf/tuakiri-attribute-filter.xml" />
    
    Note

    Note: if your $IDP_HOME is different from /opt/shibboleth-idp, change the file path in the above snippet accordingly.

    Note

    If configuring this in Shibboleth IdP 2.1.x, do not use the srv: namespace prefix - i.e., use just:

    Code Block
    xml
    xml
             <ConfigurationResource xsi:type="resource:FileBackedHttpResource"
                          url="http://directory.tuakiri.ac.nz/attribute-filter/<institution-domain>.xml"
                          file="/opt/shibboleth-idp/conf/tuakiri-attribute-filter.xml" />
    
    
  • We also strongly recommend you configure your IdP to periodically reload this file - we recommend at 2 hour interval. This is documented in detail in the IdP Install Manual: Reloading configuration section and Load AAF Atribute Filter sections. The simple step is to add the configurationResourcePollingFrequency="PT2H0M0.000S" and configurationResourcePollingRetryAttempts="10" attributes to the <srv:Service id="shibboleth.AttributeFilterEngine"element.

    No Format
         <srv:Service id="shibboleth.AttributeFilterEngine"
    +             configurationResourcePollingFrequency="PT2H0M0.000S" configurationResourcePollingRetryAttempts="10"
                 xsi:type="attribute-afp:ShibbolethAttributeFilteringEngine">
    

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Appendix A - Alternative implementation

Loading the metadata and the attribute filter files from a remote URL makes the IdP depend on the accessibility of the remote URL. While for metadata itself, the IdP software should be sufficiently resilient, for attribute filter configuration, this is not the case. Tuakiri will be running their servers serving these XML files according to the best practices. However, some sites may prefer not to take on the risk and put the XML file loading outside of the IdP, into a separate process. This section describes this alternative implementation.

This implementation is based on using an external script (fetch-xml.sh). This script loads the XML file (over an HTTPS connection), checks the XML document for well-formedness, optionally verifies the signature on the downloaded XML document - and if all tests are passed, replaces the original file with a single "mv". The IdP would then detect a change and reload the file.

The script takes three arguments: the remote URL, the local file name, and an email address to send any errors to (no email sent if everything goes well).

An extra optional step (documented below) is to install XmlSecTool for verifying the signature. Otherwise, downloading the file over HTTPS and checking the XML structure provides also reasonable guarantees. If using XmlSecTool, the script takes a fourth argument, the certificate to check the signature with. And in this case, XmlSecTool must be found either in the PATH or in the XMLSECTOOL environment variable.

To deploy this solution without XmlSecTool:

...

No Format
wget http://directory.tuakiri.ac.nz/metadata/tuakiri-metadata-cert.pem -O $IDP_HOME/credentials/tuakiri-metadata-cert.pem

...

No Format
/opt/shibboleth-idp/bin/fetch-xml.sh https://directory.tuakiri.ac.nz/metadata/tuakiri-metadata-signed.xml /opt/shibboleth-idp/metadata/tuakiri-metadata.xml errors@institution.domain.ac.nz

...

No Format
/opt/shibboleth-idp/bin/fetch-xml.sh http://directory.tuakiri.ac.nz/attribute-filter/institution.domain.ac.nz.xml /opt/shibboleth-idp/conf/tuakiri-attribute-filter.xml errors@institution.domain.ac.nz

...


        <!-- Tuakiri -->
        <metadata:MetadataProvider id="Tuakiri" xsi:type="metadata:ResourceBackedMetadataProvider">
          <metadata:MetadataFilter xsi:type="metadata:ChainingFilter" xmlns="urn:mace:shibboleth:2.0:metadata">
            <metadata:MetadataFilter xsi:type="metadata:SignatureValidation" xmlns="urn:mace:shibboleth:2.0:metadata"
                            trustEngineRef="shibboleth.MetadataTrustEngine"
                            requireSignedMetadata="true" />
          </metadata:MetadataFilter>
          <metadata:MetadataResource xsi:type="resource:FilesystemResource" file="/opt/shibboleth-idp/metadata/tuakiri-metadata.xml" />
        </metadata:MetadataProvider>

...


        <security:Credential id="Tuakiri-FederationCredentials" xsi:type="security:X509Filesystem">
            <security:Certificate>/opt/shibboleth-idp/credentials/tuakiri-metadata-cert.pem</security:Certificate>
        </security:Credential>

...


        <srv:ConfigurationResource file="/opt/shibboleth-idp/conf/tuakiri-attribute-filter.xml" xsi:type="resource:FilesystemResource" />
  • Create a cron job to periodically (every 2 hours) download the metadata and the attribute filter: run crontab -e and add the following entry (matching the command you had run on the command line earlier):
    No Format
    
    02 */2 * * * /opt/shibboleth-idp/bin/fetch-xml.sh https://directory.tuakiri.ac.nz/metadata/tuakiri-metadata-signed.xml /opt/shibboleth-idp/metadata/tuakiri-metadata.xml errors@institution.domain.ac.nz
    02 */2 * * * /opt/shibboleth-idp/bin/fetch-xml.sh http://directory.tuakiri.ac.nz/attribute-filter/institution.domain.ac.nz.xml /opt/shibboleth-idp/conf/tuakiri-attribute-filter.xml errors@institution.domain.ac.nz
    

Optional: Installing XmlSecTool

  • Download latest version (1.1.5 as of September 2011) from http://www.shibboleth.net/downloads/tools/xmlsectool/latest/ into ~/inst
    • Unzip into /opt/xmlsectool-$XMLSECTOOL_VERSION
    • Symlink as /opt/xmlsectool
      No Format
      
      export XMLSECTOOL_VERSION="1.1.5"
      wget -P ~/inst/ http://www.shibboleth.net/downloads/tools/xmlsectool/latest/xmlsectool-$XMLSECTOOL_VERSION-bin.zip
      cd /opt
      unzip ~/inst/xmlsectool-$XMLSECTOOL_VERSION-bin.zip
      ln -s xmlsectool-$XMLSECTOOL_VERSION xmlsectool
      
  • Set JAVA_HOME to your Java installation:
    No Format
    
    export JAVA_HOME=/usr/lib/jvm/java
    
  • Invoke as /opt/xmlsectool/xmlsectool.sh
  • Modify fetch-xml.sh cron jobs to use XmlSecTool to verify signature:
    • Add /opt/shibboleth-idp/credentials/tuakiri-metadata-cert.pem as an additional argument (the certificate to verify signatures with)
    • Prefix the commands with environment variable settings to tell the script where to find XmlSecTool and tell XmlSecTool where to find Java: JAVA_HOME=/usr/lib/jvm/java XMLSECTOOL=/opt/xmlsectool/xmlsectool.sh
    • The final form of the cron jobs is:
      No Format
      
      02 */2 * * * JAVA_HOME=/usr/lib/jvm/java XMLSECTOOL=/opt/xmlsectool/xmlsectool.sh /opt/shibboleth-idp/bin/fetch-xml.sh https://directory.tuakiri.ac.nz/metadata/tuakiri-metadata-signed.xml /opt/shibboleth-idp/metadata/tuakiri-metadata.xml errors@institution.domain.ac.nz /opt/shibboleth-idp/credentials/tuakiri-metadata-cert.pem
      02 */2 * * * JAVA_HOME=/usr/lib/jvm/java XMLSECTOOL=/opt/xmlsectool/xmlsectool.sh /opt/shibboleth-idp/bin/fetch-xml.sh http://directory.tuakiri.ac.nz/attribute-filter/institution.domain.ac.nz.xml /opt/shibboleth-idp/conf/tuakiri-attribute-filter.xml errors@institution.domain.ac.nz /opt/shibboleth-idp/credentials/tuakiri-metadata-cert.pem
      

See here: Fetching Metadata and Attribute Filter and caching them locally 

Appendix B - Tuakiri-TEST Federation

This section gives the variants of the commands to be used when configuring the IdP to join the Tuakiri-TEST Federation (instead of Tuakiri Production).

  • To download the Tuakiri-TEST metadata signing certificate, run the following command:

    No Format
    wget http://directory.test.tuakiri.ac.nz/metadata/tuakiri-test-metadata-cert.pem -O $IDP_HOME/credentials/tuakiri-test-metadata-cert.pem
  • For loading the Tuakiri-TEST metadata, put the following into relying-party.xml:

    Code Block
    xml
    xml
             <!-- Tuakiri-TEST -->
            <metadata:MetadataProvider id="Tuakiri-TEST" xsi:type="metadata:ResourceBackedMetadataProvider">
              <metadata:MetadataFilter xsi:type="metadata:ChainingFilter" xmlns="urn:mace:shibboleth:2.0:metadata">
                <metadata:MetadataFilter xsi:type="metadata:SignatureValidation" xmlns="urn:mace:shibboleth:2.0:metadata"
                                trustEngineRef="shibboleth.MetadataTrustEngine"
                                requireSignedMetadata="true" />
              </metadata:MetadataFilter>
              <metadata:MetadataResource xsi:type="resource:FileBackedHttpResource"
                              url="http://directory.test.tuakiri.ac.nz/metadata/tuakiri-test-metadata-signed.xml"
                              file="/opt/shibboleth-idp/metadata/tuakiri-test-metadata.xml" />
            </metadata:MetadataProvider>
    
  • And the code to load the Tuakiri-TEST metadata signing certificate would be - also in relying-party.xml in the <security:TrustEngine id="shibboleth.MetadataTrustEngine" xsi:type="security:StaticExplicitKeySignature">element:

    Code Block
    xml
    xml
             <security:Credential id="Tuakiri-Test-FederationCredentials" xsi:type="security:X509Filesystem">
                <security:Certificate>/opt/shibboleth-idp/credentials/tuakiri-test-metadata-cert.pem</security:Certificate>
            </security:Credential>
    
  • The snippet to load attribute filter configuration would be (again, drop the srvnamespace prefix with Shibboleth IdP 2.1.x):

    Code Block
    xml
    xml
             <srv:ConfigurationResource xsi:type="resource:FileBackedHttpResource"
                                  url="http://directory.test.tuakiri.ac.nz/attribute-filter/<institution-domain>.xml"
                                  file="/opt/shibboleth-idp/conf/tuakiri-test-attribute-filter.xml" />