Handle empty URI references as per http://www.w3.org/TR/xmldsig-core/#sec-Same-Document; thx to @sixto for resolving a test case failure.

Author: knightlabs

lib/onelogin/ruby-saml/version.rb

@@ -1,5 +1,5 @@
 module OneLogin
   module RubySaml
-    VERSION = '1.0.0'
+    VERSION = '1.0.1'
   end
 end

lib/xml_security.rb

@@ -262,14 +262,21 @@ def validate_signature(base64_cert, soft = true)
         '//ds:CanonicalizationMethod',
         'ds' => DSIG
       )
+
+      noko_signed_info_reference_element_uri_attr = noko_signed_info_element.at_xpath('./ds:Reference', 'ds' => DSIG).attributes["URI"]
+      if (noko_signed_info_reference_element_uri_attr.value.empty?)
+        noko_signed_info_reference_element_uri_attr.value = "##{document.root.attribute('ID')}"
+      end
+
       canon_string = noko_signed_info_element.canonicalize(canon_algorithm)
       noko_sig_element.remove
 
       # check digests
       REXML::XPath.each(@sig_element, "//ds:Reference", {"ds"=>DSIG}) do |ref|
         uri = ref.attributes.get_attribute("URI").value
 
-        hashed_element = document.at_xpath("//*[@ID=$uri]", nil, { 'uri' => uri[1..-1] })
+        hashed_element = uri.empty? ? document : document.at_xpath("//*[@ID=$uri]", nil, { 'uri' => uri[1..-1] })
+        # hashed_element = document.at_xpath("//*[@ID=$uri]", nil, { 'uri' => uri[1..-1] })
         canon_algorithm = canon_algorithm REXML::XPath.first(
           ref,
           '//ds:CanonicalizationMethod',
@@ -336,7 +343,11 @@ def extract_signed_element_id
         "//ds:Signature/ds:SignedInfo/ds:Reference",
         {"ds"=>DSIG}
       )
-      self.signed_element_id = reference_element.attribute("URI").value[1..-1] unless reference_element.nil?
+
+      return nil if reference_element.nil?
+
+      sei = reference_element.attribute("URI").value[1..-1] 
+      self.signed_element_id = sei.nil? ? self.root.attribute("ID") : sei
     end
 
     def extract_inclusive_namespaces

test/response_test.rb

@@ -9,6 +9,7 @@ class RubySamlTest < Minitest::Test
     let(:settings) { OneLogin::RubySaml::Settings.new }
     let(:response) { OneLogin::RubySaml::Response.new(response_document_without_recipient) }
     let(:response_without_attributes) { OneLogin::RubySaml::Response.new(response_document_without_attributes) }
+    let(:response_without_reference_uri) { OneLogin::RubySaml::Response.new(response_document_without_reference_uri) }
     let(:response_with_signed_assertion) { OneLogin::RubySaml::Response.new(response_document_with_signed_assertion) }
     let(:response_unsigned) { OneLogin::RubySaml::Response.new(response_document_unsigned) }
     let(:response_wrapped) { OneLogin::RubySaml::Response.new(response_document_wrapped) }
@@ -384,6 +385,15 @@ class RubySamlTest < Minitest::Test
           response_no_version.is_valid?
           assert_includes response_no_version.errors, "Unsupported SAML version"
         end
+
+        it "return true when a nil URI is given in the ds:Reference" do
+
+          response_without_reference_uri.stubs(:conditions).returns(nil)
+          response_without_reference_uri.settings = settings
+          response_without_reference_uri.settings.idp_cert_fingerprint = "19:4D:97:E4:D8:C9:C8:CF:A4:B7:21:E5:EE:49:7F:D9:66:0E:52:13"
+          assert response_without_reference_uri.is_valid?
+          assert_empty response_without_reference_uri.errors
+        end
       end
     end
 

test/responses/response_without_reference_uri.xml.base64

@@ -0,0 +1 @@
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

test/test_helper.rb

@@ -66,6 +66,10 @@ def response_document_without_attributes
     @response_document_without_attributes ||= read_response("response_without_attributes.xml.base64")
   end
 
+  def response_document_without_reference_uri
+    @response_document_without_reference_uri ||= read_response("response_without_reference_uri.xml.base64")
+  end
+
   def response_document_with_signed_assertion
     @response_document_with_signed_assertion ||= read_response("response_with_signed_assertion.xml.base64")
   end