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HOWTO Configure Shibboleth IdP v4.x for Google Suite.md

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HOWTO Configure Shibboleth IdP v4.x for Google Suite

  1. Into conf/relying-party.xml, under <util:list id="shibboleth.RelyingPartyOverrides">, add the following <bean>:

    <bean id="Google" parent="RelyingPartyByName" c:relyingPartyIds="google.com">
   <property name="profileConfigurations">
        <list>
           <bean parent="SAML2.SSO" p:encryptAssertions="false" p:encryptNameIDs="false" />
        </list>
   </property>
</bean>

  2. Into conf/saml-nameid.xml, inside the <util:list id="shibboleth.SAML2NameIDGenerators"> list, insert:

    <!-- Release to Google an "emailAddress" NameID with the value of Gprincipal -->
<bean parent="shibboleth.SAML2AttributeSourcedGenerator"
      p:format="urn:oasis:names:tc:SAML:1.1:nameid-format:emailAddress"
      p:attributeSourceIds="#{ {'Gprincipal'} }">
   <property name="activationCondition">
      <bean parent="shibboleth.Conditions.RelyingPartyId" c:candidate="google.com" />
   </property>
</bean>

  3. Into conf/attribute-resolver.xml, create the following <AttributeDefinition> to be able to generate the Google Principal (GPrincipal) attribute (if it is not already present into your LDAP directory):

    <AttributeDefinition xsi:type="Template" id="Gprincipal">
   <InputDataConnector ref="myLDAP" attributeNames="uid" />
   <Template>
      <![CDATA[
         ${uid}@gmail.com
      ]]>
   </Template>
</AttributeDefinition>

  4. Create conf/attributes/custom/Gprincipal.properties as follow (the example considers italian and english languages only):

    # Gprincipal

id=Gprincipal
transcoder=SAML2StringTranscoder
displayName.en=Username Google
displayName.it=Username Google
description.en=Username for Google
description.it=Username usato da Google
saml2.name=urn:oid:0.9.2342.19200300.100.1.3
saml1.encodeType=false

  5. Into metadata/google-md.xml, add the following content by changing university.edu with the correct value of your institution:

    <?xml version="1.0" encoding="UTF-8" standalone="no"?>

<!-- entityID = "google.com" -->
<EntityDescriptor entityID="google.com" xmlns="urn:oasis:names:tc:SAML:2.0:metadata">
   <SPSSODescriptor protocolSupportEnumeration="urn:oasis:names:tc:SAML:2.0:protocol">
      <NameIDFormat>urn:oasis:names:tc:SAML:1.1:nameid-format:emailAddress</NameIDFormat>
      <AssertionConsumerService index="1" Binding="urn:oasis:names:tc:SAML:2.0:bindings:HTTP-POST" Location="https://www.google.com/a/university.edu/acs" />
   </SPSSODescriptor>
</EntityDescriptor>

  6. Into conf/metadata-providers.xml add the Google metadata:

    <MetadataProvider id="Google”  xsi:type="FilesystemMetadataProvider" metadataFile="%{idp.home}/metadata/google-md.xml"/>

  7. Into conf/attribute-filter.xml, configure the attribute release:

    <!-- G Suite (Google Apps)  -->
<AttributeFilterPolicy id="google.com">
   <PolicyRequirementRule xsi:type="Requester" value="google.com" />
   <AttributeRule attributeID="Gprincipal">
      <PermitValueRule xsi:type="ANY" />
   </AttributeRule>
</AttributeFilterPolicy>

  8. Test with AACLI: bash /opt/shibboleth-idp/bin/aacli.sh -n <REPLACE_WITH_USERNAME_IDP> -r google.com --saml2