Class: Spid::Saml::Metadata

Inherits:
Object
  • Object
show all
Includes:
REXML, Coding
Defined in:
lib/spid/ruby-saml/metadata.rb

Constant Summary collapse

HTTP_POST =

a few symbols for SAML class names

"urn:oasis:names:tc:SAML:2.0:bindings:HTTP-POST"
HTTP_GET = 
"urn:oasis:names:tc:SAML:2.0:bindings:HTTP-Redirect"
@@cache = 
{}

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from Coding

#decode, #deflate, #encode, #escape, #inflate, #unescape

Constructor Details

#initialize(settings = nil) ⇒ Metadata

Returns a new instance of Metadata.



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# File 'lib/spid/ruby-saml/metadata.rb', line 26

def initialize(settings=nil)
  if settings
    @settings = settings
  end
end

Instance Attribute Details

#uuid ⇒ Object

Returns the value of attribute uuid.



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# File 'lib/spid/ruby-saml/metadata.rb', line 22

def uuid
  @uuid
end

Instance Method Details

#binding_select(service) ⇒ Object

get the IdP metadata, and select the appropriate SSO binding that we can support. Currently this is HTTP-Redirect and HTTP-POST but more could be added in the future



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# File 'lib/spid/ruby-saml/metadata.rb', line 384

def binding_select(service)
  # first check if we're still using the old hard coded method for 
  # backwards compatability
  if service == "SingleSignOnService" && @settings.idp_sso_target_url != nil
      return @settings.idp_sso_target_url
  end
  if service == "SingleLogoutService" && @settings.idp_slo_target_url != nil
      return  @settings.idp_slo_target_url
  end
  
  meta_doc = get_idp_metadata
  return nil unless meta_doc
  # first try GET (REDIRECT)
  sso_element = REXML::XPath.first(meta_doc, "/EntityDescriptor/IDPSSODescriptor/#{service}[@Binding='#{HTTP_GET}']")
  if !sso_element.nil? 
    @URL = sso_element.attributes["Location"]
    Logging.debug "binding_select: GET from #{@URL}"
    return @URL
  end
          
  # next try post
  sso_element = REXML::XPath.first(meta_doc, "/EntityDescriptor/IDPSSODescriptor/#{service}[@Binding='#{HTTP_POST}']")
  if !sso_element.nil? 
    @URL = sso_element.attributes["Location"]
    #Logging.debug "binding_select: POST to #{@URL}"
    return @URL
  end

  # other types we might want to add in the future:  SOAP, Artifact
end

#build_message(options = {}) ⇒ Object

Construct a SAML message using information in the IdP metadata.

:type can be either “SAMLRequest” or “SAMLResponse” :service refers to the Binding method, 

either "SingleLogoutService" or "SingleSignOnService"

:message is the SAML message itself (XML)

I’ve provided easy to use wrapper functions above



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# File 'lib/spid/ruby-saml/metadata.rb', line 375

def build_message( options = {} )
  opt = { :type => nil, :service => nil, :message => nil, :extra_parameters => nil }.merge(options)
  url = binding_select( opt[:service] )
  return message_get( opt[:type], url, opt[:message], opt[:extra_parameters] )
end

#create_slo_request(message, extra_parameters = {}) ⇒ Object 



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# File 'lib/spid/ruby-saml/metadata.rb', line 358

def create_slo_request(message, extra_parameters = {} )
  build_message( :type => "SAMLRequest", 
      :service => "SingleLogoutService", 
      :message => message, :extra_parameters => extra_parameters)
end

#create_slo_response(message, extra_parameters = {}) ⇒ Object 



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# File 'lib/spid/ruby-saml/metadata.rb', line 363

def create_slo_response(message, extra_parameters = {} )
  build_message( :type => "SAMLResponse", 
      :service => "SingleLogoutService", 
      :message => message, :extra_parameters => extra_parameters)     
end

#create_sso_request(message, extra_parameters = {}) ⇒ Object 



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# File 'lib/spid/ruby-saml/metadata.rb', line 348

def create_sso_request(message, extra_parameters = {} )
  build_message( :type => "SAMLRequest", 
      :service => "SingleSignOnService", 
      :message => message, :extra_parameters => extra_parameters)
end

#create_sso_response(message, extra_parameters = {}) ⇒ Object 



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# File 'lib/spid/ruby-saml/metadata.rb', line 353

def create_sso_response(message, extra_parameters = {} )
  build_message( :type => "SAMLResponse", 
      :service => "SingleSignOnService", 
      :message => message, :extra_parameters => extra_parameters)     
end

#extract_certificate(meta_doc) ⇒ Object 



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# File 'lib/spid/ruby-saml/metadata.rb', line 508

def extract_certificate(meta_doc)
  #ricerco il certificato con nokogiri
  # pull out the x509 tag
  x509 = meta_doc.xpath("//EntityDescriptor//IDPSSODescriptor//KeyDescriptor//KeyInfo//X509Data//X509Certificate")
  if !x509.nil? 
    if x509.length > 1
      @settings.idp_cert = []
      x509.children.each{|child_cert|
        @settings.idp_cert << child_cert.to_s.gsub(/\n/, "").gsub(/\t/, "")
      }
    else #un array con un campo
      @settings.idp_cert = [x509.children[0].to_s.gsub(/\n/, "").gsub(/\t/, "")]
    end
  else #se nil uso il certificato in keyinfo, non dovrebbe mai accadere
    x509 = meta_doc.xpath("//EntityDescriptor//Signature//KeyInfo//X509Data//X509Certificate") 
  end
  #se ci sono n certificati ritorno array
  @settings.idp_cert
end

#fetch(uri_str, limit = 10) ⇒ Object

Raises:

  • (ArgumentError) 


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# File 'lib/spid/ruby-saml/metadata.rb', line 416

def fetch(uri_str, limit = 10)
  # You should choose a better exception.
  raise ArgumentError, 'too many HTTP redirects' if limit == 0

  uri = URI.parse(uri_str)
  if uri.scheme == "http"
    response = Net::HTTP.get_response(uri)
  elsif uri.scheme == "https"
    http = Net::HTTP.new(uri.host, uri.port)
    http.use_ssl = true
    # Most IdPs will probably use self signed certs
    #http.verify_mode = OpenSSL::SSL::VERIFY_PEER
    http.verify_mode = OpenSSL::SSL::VERIFY_NONE
    get = Net::HTTP::Get.new(uri.request_uri)
    response = http.request(get)
  end

  case response
  when Net::HTTPSuccess then
    response
  when Net::HTTPRedirection then
    location = response['location']
    warn "redirected to #{location}"
    fetch(location, limit - 1)
  else
    response.value
  end
end

#generate(settings) ⇒ Object 



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# File 'lib/spid/ruby-saml/metadata.rb', line 32

def generate(settings)
  #meta_doc = REXML::Document.new
  meta_doc = Spid::XMLSecurityNew::Document.new
  if settings.aggregato
    root = meta_doc.add_element "md:EntityDescriptor", { 
      "xmlns:md"        => "urn:oasis:names:tc:SAML:2.0:metadata",
      "xmlns:xml"       => "http://www.w3.org/XML/1998/namespace",
      "xmlns:spid"        => "https://spid.gov.it/saml-extensions",
    }
  else
    root = meta_doc.add_element "md:EntityDescriptor", { 
      "xmlns:md"        => "urn:oasis:names:tc:SAML:2.0:metadata",
      "xmlns:xml"       => "http://www.w3.org/XML/1998/namespace"
    }
  end
  
  if settings.issuer != nil
    root.attributes["entityID"] = settings.issuer
  end
  #Tolto per non far cambiare sempre il metadata
  #uuid = "_" + UUID.new.generate
  #genero l'id come hash dell'entityID
  uuid = "_"+Digest::MD5.hexdigest(settings.issuer)
  self.uuid = uuid
  root.attributes["ID"] = uuid

  sp_sso = root.add_element "md:SPSSODescriptor", { 
      "protocolSupportEnumeration" => "urn:oasis:names:tc:SAML:2.0:protocol",
      "WantAssertionsSigned"       => "true",
      "AuthnRequestsSigned"         => "true"

  }


  # if settings.sp_cert != nil
  #   keyDescriptor = sp_sso.add_element "md:KeyDescriptor", {
  #     "use" => "signing"
  #   }
  #   keyInfo = keyDescriptor.add_element "ds:KeyInfo", {
  #     "xmlns:ds" => "http://www.w3.org/2000/09/xmldsig#"
  #   }
  #   x509Data = keyInfo.add_element "ds:X509Data"
  #   x509Certificate = x509Data.add_element "ds:X509Certificate"
  #   file = ""
  #   File.foreach(settings.sp_cert){ |line|
  #                                file  += line unless (line.include?("RSA PUBLIC KEY") || line.include?("CERTIFICATE")) 
  #                              }
  #   x509Certificate.text = file                            
  # end

  # Add KeyDescriptor if messages will be signed / encrypted
  #cert = settings.get_sp_cert
  cert = settings.get_cert(settings.sp_cert)
  if cert
    
    if cert.is_a?(String)
      cert = OpenSSL::X509::Certificate.new(cert)
    end
    
    cert_text = Base64.encode64(cert.to_der).to_s.gsub(/\n/, "").gsub(/\t/, "")
    kd = sp_sso.add_element "md:KeyDescriptor", { "use" => "signing" }
    ki = kd.add_element "ds:KeyInfo", {"xmlns:ds" => "http://www.w3.org/2000/09/xmldsig#"}
    xd = ki.add_element "ds:X509Data"
    xc = xd.add_element "ds:X509Certificate"
    xc.text = cert_text

    # kd2 = sp_sso.add_element "md:KeyDescriptor", { "use" => "encryption" }
    # ki2 = kd2.add_element "ds:KeyInfo", {"xmlns:ds" => "http://www.w3.org/2000/09/xmldsig#"}
    # xd2 = ki2.add_element "ds:X509Data"
    # xc2 = xd2.add_element "ds:X509Certificate"
    # xc2.text = cert_text
  end

  if !settings.sp_external_consumer_cert.nil? && settings.sp_external_consumer_cert.length > 0
    settings.sp_external_consumer_cert.each{ |cert_cons_external|
      cert_ex = settings.get_cert(cert_cons_external)
      if cert_ex
        
        if cert_ex.is_a?(String)
          cert_ex = OpenSSL::X509::Certificate.new(cert_ex)
        end
        
        cert_text = Base64.encode64(cert_ex.to_der).to_s.gsub(/\n/, "").gsub(/\t/, "")
        kd = sp_sso.add_element "md:KeyDescriptor", { "use" => "signing" }
        ki = kd.add_element "ds:KeyInfo", {"xmlns:ds" => "http://www.w3.org/2000/09/xmldsig#"}
        xd = ki.add_element "ds:X509Data"
        xc = xd.add_element "ds:X509Certificate"
        xc.text = cert_text
      end
    }
  end

  if settings.single_logout_service_url != nil
    sp_sso.add_element "md:SingleLogoutService", {
        "Binding" => "urn:oasis:names:tc:SAML:2.0:bindings:HTTP-Redirect",
        "Location" => settings.single_logout_service_url
    }
    sp_sso.add_element "md:SingleLogoutService", {
        "Binding" => "urn:oasis:names:tc:SAML:2.0:bindings:HTTP-POST",
        "Location" => settings.single_logout_service_url
    }
  end

  #Logout dei servizi esterni
  unless settings.hash_assertion_consumer.blank?
    settings.hash_assertion_consumer.each_pair{ |index, hash_service|
      unless hash_service['logout'].blank?
        sp_sso.add_element "md:SingleLogoutService", {
          "Binding" => hash_service['logout']['binding'] || "urn:oasis:names:tc:SAML:2.0:bindings:HTTP-POST",
          "Location" => hash_service['logout']['location']
        }
      end
    }
  end

  name_identifier_formats = settings.name_identifier_format
  if name_identifier_formats != nil
    name_id = []
    name_identifier_formats.each_with_index{ |format, index|
      name_id[index] = sp_sso.add_element "md:NameIDFormat"
      name_id[index].text = format
    }
    
  end

  if settings.assertion_consumer_service_url
      #ciclo e creo i vari tag AssertionConsumerService
      settings.hash_assertion_consumer.each_pair{ |index, hash_service|
          sp_sso.add_element "md:AssertionConsumerService", {
            "Binding" => settings.assertion_consumer_service_binding,
            "Location" => hash_service['url_consumer'],
            "isDefault" => hash_service['default'],
            "index" => index
          }
      }

      # #Caso con eidas
      # sp_sso.add_element "md:AssertionConsumerService", {
      #     "Binding" => settings.assertion_consumer_service_binding,
      #     "Location" => settings.assertion_consumer_service_url,
      #     "index" => 99
      # }
      
      # sp_sso.add_element "md:AssertionConsumerService", {
      #     "Binding" => settings.assertion_consumer_service_binding,
      #     "Location" => settings.assertion_consumer_service_url,
      #     "index" => 100
      # }

      settings.hash_assertion_consumer.each_pair{ |index, hash_service|

        #AttributeConsumingService
        attr_cons_service = sp_sso.add_element "md:AttributeConsumingService", {
            "index" => index,
        }
        service_name = attr_cons_service.add_element "md:ServiceName", {
              "xml:lang" => "it"
        }
        service_name.text = hash_service['testo']
        unless hash_service['description'].blank?
          service_description = attr_cons_service.add_element "md:ServiceDescription", {
            "xml:lang" => "it"
          }
          service_description.text = hash_service['description']
        end
        
        if hash_service['array_campi'].is_a?(Array)
          hash_service['array_campi'].each_with_index{ |attribute, index|
            attr_cons_service.add_element "md:RequestedAttribute", {
                "Name" => attribute
            }
          }
        else #hash
          hash_service['array_campi'].each_pair{ |attribute, name_format|
            attr_cons_service.add_element "md:RequestedAttribute", {
                "Name" => attribute,
                "NameFormat" => name_format
            }
          }
        end
      }


  end
  #organization
  organization = root.add_element "md:Organization"
  org_name = organization.add_element "md:OrganizationName", {
      "xml:lang" => "it"
  }
  org_name.text = settings.organization['org_name']
  org_display_name = organization.add_element "md:OrganizationDisplayName", {
      "xml:lang" => "it"
  }
    
  org_display_name.text = settings.organization['org_display_name'] #+(settings.aggregato ? " tramite #{settings.hash_aggregatore['soggetto_aggregatore']}" : '')
  org_url = organization.add_element "md:OrganizationURL", {
      "xml:lang" => "it"
  }
  org_url.text = settings.organization['org_url']

  #ContactPerson per sp aggregato
  if settings.aggregato
    contact_person_aggregatore = root.add_element "md:ContactPerson", {
      "contactType" => "other",
      "spid:entityType" => "spid:aggregator"
    }

    extensions_aggregatore = contact_person_aggregatore.add_element "md:Extensions"

    unless settings.hash_aggregatore['piva_aggregatore'].blank?
      vat_number_aggregatore = extensions_aggregatore.add_element "spid:VATNumber"
      vat_number_aggregatore.text = settings.hash_aggregatore['piva_aggregatore']
    end

    unless settings.hash_aggregatore['cipa_aggregatore'].blank?
      ipa_code_aggregatore = extensions_aggregatore.add_element "spid:IPACode"
      ipa_code_aggregatore.text = settings.hash_aggregatore['cipa_aggregatore']
    end

    unless settings.hash_aggregatore['cf_aggregatore'].blank?
      fiscal_code_aggregatore = extensions_aggregatore.add_element "spid:FiscalCode"
      fiscal_code_aggregatore.text = settings.hash_aggregatore['cf_aggregatore']
    end 

    tipo_aggregatore = extensions_aggregatore.add_element "spid:PublicServicesFullAggregator"

    unless settings.hash_aggregatore['soggetto_aggregatore'].blank?
      company_aggregatore = contact_person_aggregatore.add_element "md:Company"
      company_aggregatore.text = settings.hash_aggregatore['soggetto_aggregatore']
    end

    unless settings.hash_aggregatore['email_aggregatore'].blank?
      email_address_aggregatore = contact_person_aggregatore.add_element "md:EmailAddress"
      email_address_aggregatore.text = settings.hash_aggregatore['email_aggregatore']
    end

    unless settings.hash_aggregatore['telefono_aggregatore'].blank?
      telephone_number_aggregatore = contact_person_aggregatore.add_element "md:TelephoneNumber"
      telephone_number_aggregatore.text = settings.hash_aggregatore['telefono_aggregatore']
    end

    contact_person_aggregato = root.add_element "md:ContactPerson", {
      "contactType" => "other",
      "spid:entityType" => "spid:aggregated"
    }

    extensions_aggregato = contact_person_aggregato.add_element "md:Extensions"
    unless settings.hash_aggregatore['soggetto_aggregato']['ipa_code'].blank?
      ipa_code_aggregato = extensions_aggregato.add_element "spid:IPACode" 
      ipa_code_aggregato.text = settings.hash_aggregatore['soggetto_aggregato']['ipa_code']
    end
    unless settings.hash_aggregatore['soggetto_aggregato']['vat_number'].blank?
      vat_number_aggregato = extensions_aggregato.add_element "spid:VATNumber"
      vat_number_aggregato.text = settings.hash_aggregatore['soggetto_aggregato']['vat_number']
    end
    unless settings.hash_aggregatore['soggetto_aggregato']['fiscal_code'].blank?
      fiscal_code_aggregato = extensions_aggregato.add_element "spid:FiscalCode" 
      fiscal_code_aggregato.text = settings.hash_aggregatore['soggetto_aggregato']['fiscal_code']
    end
    unless settings.hash_aggregatore['soggetto_aggregato']['ipa_code'].blank?
      tipo_aggregato = extensions_aggregato.add_element "spid:Public" 
    end

    company_aggregato = contact_person_aggregato.add_element "md:Company"
    company_aggregato.text = settings.organization['org_name']

    unless settings.hash_aggregatore['soggetto_aggregato']['email_address'].blank?
      email_address_aggregato = contact_person_aggregato.add_element "md:EmailAddress"
      email_address_aggregato.text = settings.hash_aggregatore['soggetto_aggregato']['email_address']
    end

    unless settings.hash_aggregatore['soggetto_aggregato']['telephone_number'].blank?
      telephone_number_aggregato = contact_person_aggregato.add_element "md:TelephoneNumber"
      telephone_number_aggregato.text = settings.hash_aggregatore['soggetto_aggregato']['telephone_number']
    end
    
  end

  #meta_doc << REXML::XMLDecl.new(version='1.0', encoding='UTF-8')
  meta_doc << REXML::XMLDecl.new("1.0", "UTF-8")

  
  #SE SERVE ANCHE ENCRYPTION
  # # Add KeyDescriptor if messages will be signed / encrypted
  # 
  # if cert
  #   cert_text = Base64.encode64(cert.to_der).gsub("\n", '')
  #   kd = sp_sso.add_element "md:KeyDescriptor", { "use" => "signing" }
  #   ki = kd.add_element "ds:KeyInfo", {"xmlns:ds" => "http://www.w3.org/2000/09/xmldsig#"}
  #   xd = ki.add_element "ds:X509Data"
  #   xc = xd.add_element "ds:X509Certificate"
  #   xc.text = cert_text

  #   kd2 = sp_sso.add_element "md:KeyDescriptor", { "use" => "encryption" }
  #   ki2 = kd2.add_element "ds:KeyInfo", {"xmlns:ds" => "http://www.w3.org/2000/09/xmldsig#"}
  #   xd2 = ki2.add_element "ds:X509Data"
  #   xc2 = xd2.add_element "ds:X509Certificate"
  #   xc2.text = cert_text
  # end

  #cert = settings.get_sp_cert
  cert = settings.get_cert(settings.sp_cert) #inserisco il certificato principale
  # embed signature
  if settings.metadata_signed && settings.sp_private_key && settings.sp_cert
    private_key = settings.get_sp_key
    meta_doc.sign_document(private_key, cert)
  end
  ret = ""
  # stampo come stringa semplice i metadata per non avere problemi con validazione firma
  ret = meta_doc.to_s
  #Logging.debug "Generated metadata:\n#{ret}"

  return ret

end

#get_idp_metadata ⇒ Object

Retrieve the remote IdP metadata from the URL or a cached copy returns a REXML document of the metadata



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# File 'lib/spid/ruby-saml/metadata.rb', line 449

def get_idp_metadata
  return false if @settings.idp_metadata.nil?
  # Look up the metdata in cache first
  id = Digest::MD5.hexdigest(@settings.idp_metadata)
  unless @@cache[id].blank?
    Logging.debug "IdP metadata cache used for #{@settings.idp_metadata}"
    doc_noko = @@cache[id] 
  else #save in cache
    response = fetch(@settings.idp_metadata)
    #meta_text = response.body
    #testo_response = meta_text.sub!(' xmlns:xml="http://www.w3.org/XML/1998/namespace"', '') da errori
    #uso nokogiri per cercare il certificato, uso la funzione che rimuove tutti i namespace 
    doc_noko = Nokogiri::XML(response.body.gsub(/\n/, "").gsub(/\t/, "")) #modifica per poste
    doc_noko.remove_namespaces!
    #save
    @@cache[id] = doc_noko
  end
  extract_certificate(doc_noko)
  doc_rexml = REXML::Document.new(doc_noko.to_xml)
  return doc_rexml

  
  # USE OF CACHE WITH CERTIFICATE
  # lookup = @cache.read(id)
  # if lookup != nil
  #   Logging.debug "IdP metadata cached lookup for #{@settings.idp_metadata}"
  #   doc = REXML::Document.new( lookup )
  #   extract_certificate( doc )
  #   return doc
  # end
  
  # Logging.debug "IdP metadata cache miss on #{@settings.idp_metadata}"
  # # cache miss
  # if File.exists?(@settings.idp_metadata)
  #   fp = File.open( @settings.idp_metadata, "r")
  #   meta_text = fp.read
  # else
  #   uri = URI.parse(@settings.idp_metadata)
  #   if uri.scheme == "http"
  #     response = Net::HTTP.get_response(uri)
  #     meta_text = response.body
  #   elsif uri.scheme == "https"
  #     http = Net::HTTP.new(uri.host, uri.port)
  #     http.use_ssl = true
  #     # Most IdPs will probably use self signed certs
  #     #http.verify_mode = OpenSSL::SSL::VERIFY_PEER
  #     http.verify_mode = OpenSSL::SSL::VERIFY_NONE
  #     get = Net::HTTP::Get.new(uri.request_uri)
  #     response = http.request(get)
  #     meta_text = response.body
  #   end
  # end
  # # Add it to the cache
  # @cache.write(id, meta_text, @settings.idp_metadata_ttl )
  # doc = REXML::Document.new( meta_text )
  # extract_certificate(doc)
  # return doc
end

#message_get(type, url, message, extra_parameters = {}) ⇒ Object

construct the parameter list on the URL and return



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# File 'lib/spid/ruby-saml/metadata.rb', line 529

def message_get( type, url, message, extra_parameters = {} )
  params = Hash.new
  if extra_parameters
    params.merge!(extra_parameters)
  end
  # compress GET requests to try and stay under that 8KB request limit
  #deflate of samlrequest
  params[type] = encode( deflate( message ) )
  #Logging.debug "#{type}=#{params[type]}"
  
  uri = Addressable::URI.parse(url)
  if uri.query_values == nil
    uri.query_values = params
  else
    # solution to stevenwilkin's parameter merge
    uri.query_values = params.merge(uri.query_values)
  end
  url = uri.to_s
  #Logging.debug "Sending to URL #{url}"
  return url
end