Overview

This will describe how to get Shibboleth 3.4.x working with Google Apps for Education

Shibboleth IDP Configuration

In the code below:

Replace university.edu which your Google Domain.

----------

relying-party.xml

Find the section that says

relying-party.xml

    <util:list id="shibboleth.RelyingPartyOverrides">
.
.
.
   </util:list>

And add in between:

relying-party.xml

        <bean parent="RelyingPartyByName" c:relyingPartyIds="google.com/a/university.edu">
            <property name="profileConfigurations">
                <list>
                    <bean parent="SAML2.SSO" p:encryptAssertions="false" />
                </list>
            </property>
        </bean>

The above turns off encrypted assertions which Google does not support.

Create your google-university-metadata.xml, it should look like this:

google-university-metadata.xml

<EntityDescriptor entityID="google.com/a/university.edu" 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>

In your metadata-providers.xml file add the following:

metadata-providers.xml

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

In your attribute-resolver.xml, add the following:

attribute-resolver.xml

    <AttributeDefinition xsi:type="Simple" id="mail">
        <InputDataConnector ref="myLDAP" attributeNames="mail"/>
        <AttributeEncoder xsi:type="SAML1String" name="urn:mace:dir:attribute-def:mail" encodeType="false" />
        <AttributeEncoder xsi:type="SAML2String" name="urn:oid:0.9.2342.19200300.100.1.3" friendlyName="mail" encodeType="false" />
    </AttributeDefinition>

This is of course, if you have your email address stored in the mail attribute in LDAP.

For instance, mine would be melvin.lasky@university.edu

In your attribute-filter.xml, add the following:

attribute-filter.xml

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

Note: Google does not appear to care what attribute you send for mail, just ensure it is the same in the saml-nameid.xml.

And lastly, in your saml-nameid.xml, uncomment the following beans (they are commented out by default):

saml-nameid.xml

.
.
.
        <bean parent="shibboleth.SAML2AttributeSourcedGenerator"
            p:omitQualifiers="true"
            p:format="urn:oasis:names:tc:SAML:1.1:nameid-format:emailAddress"
            p:attributeSourceIds="#{ {'mail'} }" />

.
.
.      

        <bean parent="shibboleth.SAML1AttributeSourcedGenerator"
            p:omitQualifiers="true"
            p:format="urn:oasis:names:tc:SAML:1.1:nameid-format:emailAddress"
            p:attributeSourceIds="#{ {'mail'} }" />

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Now, on your Google Apps for Education Admin portal

Sign In Page:

https://shibserver.university.edu/idp/profile/SAML2/Redirect/SSO

Sign Out Page:

https://shibserver.university.edu/idp/profile/Logout

And make sure “Use a domain specific issuer” is checked.

Also, that verification certificate is your idp-signing.crt

That's it. Once you have completed the above, you should have a working Google Apps for Education instance authenticating off of your Shibboleth server.