cas:user is nil when parsing xml response

[julitrows]

When using CAS-client following the instructions, I've reached a point where I've got a positive response from an external CAS server:

    CAS server responded with #<Net::HTTPOK 200 OK readbody=true>:

And the XML is like this:

    <cas:serviceResponse xmlns:cas='http://www.yale.edu/tp/cas'>
      <cas:authenticationSuccess>
        <cas:attributes>
          <cas:user>4oaz8QMucIrlFOU7dr3QpWkqbRY=</cas:user>
          <cas:ccc></cas:ccc>
          <cas:tipo>EDITED_OUT</cas:tipo>
          <cas:acceso>cd</cas:acceso>
          <cas:identificador>EDITED_OUT</cas:identificador>
          <cas:txtBienvenida>EDITED_OUT</cas:txtBienvenida>
          <cas:usuarioValidado>S</cas:usuarioValidado>
          <cas:correo>EDITED_OUT</cas:correo>
          <cas:tlf>EDITED_OUT</cas:tlf>
          <cas:tipoAcceso>2</cas:tipoAcceso>
          <cas:xusuario>EDITED_OUT</cas:xusuario>
          <!-- En caso de que el usuario disponga de certificado digital -->

          <cas:nif>EDITED_OUT</cas:nif>
          <cas:email>EDITED_OUT</cas:email>
          <cas:apellido1>EDITED_OUT</cas:apellido1>
          <cas:apellido2>EDITED_OUT</cas:apellido2>
          <cas:anagramaFiscal>EDITED_OUT</cas:anagramaFiscal>
          <cas:nombre>EDITED_OUT</cas:nombre>

          <!-- Faltan las fechas -->

          <cas:tipoCertificado>EDITED_OUT</cas:tipoCertificado>
          <cas:emisor>EDITED_OUT</cas:emisor>
          <cas:usoCertificado>EDITED_OUT</cas:usoCertificado>
          <cas:apellidosResponsable>EDITED_OUT</cas:apellidosResponsable>

          <!-- Faltan las fechas -->

          <cas:politica>1.3.6.1.4.1.5734.3.5</cas:politica>
          <cas:subject>EDITED_OUT</cas:subject>
          <cas:versionPolitica>45</cas:versionPolitica>
          <cas:organizacionEmisora>FNMT</cas:organizacionEmisora>
          <cas:idPolitica>DEFAULT</cas:idPolitica>
          <cas:numSerie>EDITED_OUT</cas:numSerie>
          <cas:clasificacion>FNMT</cas:clasificacion>
          <cas:tipoAfirma>0</cas:tipoAfirma>
        </cas:attributes>
      </cas:authenticationSuccess>
    </cas:serviceResponse>

Then I get this log message from rubycas-client:

    Ticket "EDITED_OUT" for service "EDITED_OUT" belonging to user nil is VALID.

And then this error dump:

    TypeError (can't dup NilClass):
      org/jruby/RubyKernel.java:1894:in `dup'
      ----CUTTED----

Examining the code, I've come to the conclusion that the error is in filter.rb line 64:

    controller.session[client.username_session_key] = st.user.dup

Debugging, I examined the contents of the st object:

    (rdb:2) st.is_valid?
    true
    (rdb:2) st.user
    nil
    (rdb:2) st
    #<CASClient::ServiceTicket:0x7e054262
      @renew=nil,
      @extra_attributes={
        "user"=>"4oaz8QMucIrlFOU7dr3QpWkqbRY="
        "ccc"=>nil,
        "tipo"=>"CIUDADANO",
        "acceso"=>"cd",
        "identificador"=>"EDITED_OUT",
        "txtBienvenida"=>"EDITED_OUT",
        "usuarioValidado"=>"S", 
        "correo"=>"EDITED_OUT",
        "tlf"=>"EDITED_OUT",
        "tipoAcceso"=>"2",
        "xusuario"=>"EDITED_OUT",
        "nif"=>"EDITED_OUT", 
        "email"=>"EDITED_OUT",
        "apellido1"=>"EDITED_OUT",
        "apellido2"=>"EDITED_OUT",      
        "anagramaFiscal"=>"EDITED_OUT",         
        "nombre"=>"EDITED_OUT",
        "tipoCertificado"=>"FNMT PF",       
        "emisor"=>"EDITED_OUT",
        "usoCertificado"=>"EDITED_OUT",
        "apellidosResponsable"=>"EDITED_OUT",
        "politica"=>"1.3.6.1.4.1.5734.3.5",
        "subject"=>"EDITED_OUT",
        "versionPolitica"=>"45",
        "organizacionEmisora"=>"FNMT",
        "idPolitica"=>"DEFAULT",
        "numSerie"=>"EDITED_OUT",
        "clasificacion"=>"FNMT",
        "tipoAfirma"=>"0"
      },
      @service="EDITED_OUT",
      @failure_code=nil,
      @ticket="EDITED_OUT",
      @pgt_iou=nil,
      @user=nil,
      @failure_message=nil,
      @success=true
    >

Then, researching the xml parsing and responses.rb, I arrived to this in line 55:

    cas_user = @xml.elements["cas:user"]

cas_user is always nil because there is no cas:user element in the XML root, but there's one as child of cas:attributes, thus this:

    @xml.elements["cas:attributes/cas:user"]

returns something, in my case, something that looks like a digest of some kind, though I don't know how it's encoded or what info is there.

My question is, if that cas:attributes/cas:user attribute is the one that the client is trying to parse from the XML, or if it's something else. Also, I'd like to know if that XML format I pasted above is CAS-2.0 protocol compliant or if the error comes from a badly-formed XML. It's strange that rubycas-client stores all the "useful data" inside the extra_attributes.

I'm using the following:

• Rails 2.3.11
• jRuby 1.6.2 using interpreter version 1.8
• rubycas-client version 2.3.10.rc1

Thanks your your help.