Land #16640, Patch LDAP for sychronous reads

Author: gwillcox-r7

lib/rex/proto/ldap.rb

@@ -4,6 +4,22 @@
 # Monkeypatch upstream library, for now
 # TODO: write a real LDAP client in Rex and migrate all consumers
 class Net::LDAP::Connection # :nodoc:
+  module SynchronousRead
+    def read(length = nil, opts = {})
+      data = ''
+      loop do
+        chunk = super(length - data.length)
+        if chunk.nil?
+          return data == '' ? nil : data
+        end
+
+        data << chunk
+        break if data.length == length
+      end
+
+      data
+    end
+  end
 
   def initialize(server)
     begin
@@ -12,6 +28,7 @@ def initialize(server)
         'PeerPort' => server[:port],
         'Proxies' => server[:proxies]
       )
+      @conn.extend(SynchronousRead)
     rescue SocketError
       raise Net::LDAP::LdapError, 'No such address or other socket error.'
     rescue Errno::ECONNREFUSED