Unescape escaped filter characters in #to_ber

Author: Julian Zinn

lib/net/ldap/filter.rb

@@ -291,11 +291,11 @@ def parse_ber(ber)
           case b.ber_identifier
           when 0x80 # context-specific primitive 0, SubstringFilter "initial"
             raise Net::LDAP::LdapError, "Unrecognized substring filter; bad initial value." if str.length > 0
-            str += b
+            str += escape(b)
           when 0x81 # context-specific primitive 0, SubstringFilter "any"
-            str += "*#{b}"
+            str += "*#{escape(b)}"
           when 0x82 # context-specific primitive 0, SubstringFilter "final"
-            str += "*#{b}"
+            str += "*#{escape(b)}"
             final = true
           end
         }
@@ -509,17 +509,17 @@ def to_ber
           first = nil
           ary.shift
         else
-          first = ary.shift.to_ber_contextspecific(0)
+          first = unescape(ary.shift).to_ber_contextspecific(0)
         end
 
         if ary.last.empty?
           last = nil
           ary.pop
         else
-          last = ary.pop.to_ber_contextspecific(2)
+          last = unescape(ary.pop).to_ber_contextspecific(2)
         end
 
-        seq = ary.map { |e| e.to_ber_contextspecific(1) }
+        seq = ary.map { |e| unescape(e).to_ber_contextspecific(1) }
         seq.unshift first if first
         seq.push last if last
 

spec/unit/ldap/filter_spec.rb

@@ -81,4 +81,35 @@ def eq(attribute, value)
       Net::LDAP::Filter.escape("\0*()\\").should == "\\00\\2A\\28\\29\\5C"
     end 
   end
+
+  context 'with a well-known BER string' do
+    ber = "\xa4\x2d" \
+      "\x04\x0b" "objectclass" \
+      "\x30\x1e" \
+      "\x80\x08" "foo" "*\\" "bar" \
+      "\x81\x08" "foo" "*\\" "bar" \
+      "\x82\x08" "foo" "*\\" "bar"
+
+    describe "<- .to_ber" do
+      [
+        "foo" "\\2A\\5C" "bar",
+        "foo" "\\2a\\5c" "bar",
+        "foo" "\\2A\\5c" "bar",
+        "foo" "\\2a\\5C" "bar"
+      ].each do |escaped|
+        it 'unescapes escaped characters' do
+          filter = Net::LDAP::Filter.eq("objectclass", "#{escaped}*#{escaped}*#{escaped}")
+          filter.to_ber.should == ber
+        end
+      end
+    end
+
+    describe '<- .parse_ber' do
+      it 'escapes characters' do
+        escaped = Net::LDAP::Filter.escape("foo" "*\\" "bar")
+        filter = Net::LDAP::Filter.parse_ber(ber.read_ber(Net::LDAP::AsnSyntax))
+        filter.to_s.should == "(objectclass=#{escaped}*#{escaped}*#{escaped})"
+      end
+    end
+  end
 end