Add central directory zip spoofing

Author: jvazquez-r7

lib/rex/zip/archive.rb

@@ -80,11 +80,12 @@ def save_to(fname)
     f.close
   end
 
-
-  #
   # Compress this archive and return the resulting zip file as a String.
   #
-  def pack
+  # @param spoof [Hash{String => String}] The entries whose name need to be spoofed in the Central
+  #   Directory.
+  # @return [String] The resulting zip file
+  def pack(spoof={})
     ret = ''
 
     # save the offests
@@ -104,7 +105,7 @@ def pack
     idx = 0
     @entries.each { |ent|
       cfd = CentralDir.new(ent, offsets[idx])
-      ret << cfd.pack
+      ret << cfd.pack(spoof)
       idx += 1
     }
 

lib/rex/zip/blocks.rb

@@ -115,8 +115,16 @@ def initialize(entry, offset)
     @hdr_offset = offset
   end
 
-  def pack
+  # Creates the central directory information about the particular Zip Entry.
+  #
+  # @param spoof [Hash{String => String}] The entries whose name need to be spoofed in the Central
+  #   Directory.
+  # @return [String] The resulting zip file
+  def pack(spoof={})
     path = @entry.relative_path
+    if spoof.key?(path)
+      path = spoof[path]
+    end
 
     ret = [ SIGNATURE, ZIP_VERSION ].pack('Vv')
     ret << [ ZIP_VERSION ].pack('v')