1 files changed, 86 insertions, 0 deletions
diff --git a/libmproxy/contrib/jsbeautifier/unpackers/myobfuscate.py b/libmproxy/contrib/jsbeautifier/unpackers/myobfuscate.py
new file mode 100644
index 00000000..52e10034
--- /dev/null
+++ b/libmproxy/contrib/jsbeautifier/unpackers/myobfuscate.py
@@ -0,0 +1,86 @@
+#
+# deobfuscator for scripts messed up with myobfuscate.com
+# by Einar Lielmanis <einar@jsbeautifier.org>
+#
+#     written by Stefano Sanfilippo <a.little.coder@gmail.com>
+#
+# usage:
+#
+# if detect(some_string):
+#     unpacked = unpack(some_string)
+#
+
+# CAVEAT by Einar Lielmanis
+
+#
+# You really don't want to obfuscate your scripts there: they're tracking
+# your unpackings, your script gets turned into something like this,
+# as of 2011-08-26:
+#
+#   var _escape = 'your_script_escaped';
+#   var _111 = document.createElement('script');
+#   _111.src = 'http://api.www.myobfuscate.com/?getsrc=ok' +
+#              '&ref=' + encodeURIComponent(document.referrer) +
+#              '&url=' + encodeURIComponent(document.URL);
+#   var 000 = document.getElementsByTagName('head')[0];
+#   000.appendChild(_111);
+#   document.write(unescape(_escape));
+#
+
+"""Deobfuscator for scripts messed up with MyObfuscate.com"""
+
+import re
+import base64
+
+# Python 2 retrocompatibility
+# pylint: disable=F0401
+# pylint: disable=E0611
+try:
+    from urllib import unquote
+except ImportError:
+    from urllib.parse import unquote
+
+from jsbeautifier.unpackers import UnpackingError
+
+PRIORITY = 1
+
+CAVEAT = """//
+// Unpacker warning: be careful when using myobfuscate.com for your projects:
+// scripts obfuscated by the free online version call back home.
+//
+
+"""
+
+SIGNATURE = (r'["\x41\x42\x43\x44\x45\x46\x47\x48\x49\x4A\x4B\x4C\x4D\x4E\x4F'
+             r'\x50\x51\x52\x53\x54\x55\x56\x57\x58\x59\x5A\x61\x62\x63\x64\x65'
+             r'\x66\x67\x68\x69\x6A\x6B\x6C\x6D\x6E\x6F\x70\x71\x72\x73\x74\x75'
+             r'\x76\x77\x78\x79\x7A\x30\x31\x32\x33\x34\x35\x36\x37\x38\x39\x2B'
+             r'\x2F\x3D","","\x63\x68\x61\x72\x41\x74","\x69\x6E\x64\x65\x78'
+             r'\x4F\x66","\x66\x72\x6F\x6D\x43\x68\x61\x72\x43\x6F\x64\x65","'
+             r'\x6C\x65\x6E\x67\x74\x68"]')
+
+def detect(source):
+    """Detects MyObfuscate.com packer."""
+    return SIGNATURE in source
+
+def unpack(source):
+    """Unpacks js code packed with MyObfuscate.com"""
+    if not detect(source):
+        return source
+    payload = unquote(_filter(source))
+    match = re.search(r"^var _escape\='<script>(.*)<\/script>'",
+                      payload, re.DOTALL)
+    polished = match.group(1) if match else source
+    return CAVEAT + polished
+
+def _filter(source):
+    """Extracts and decode payload (original file) from `source`"""
+    try:
+        varname = re.search(r'eval\(\w+\(\w+\((\w+)\)\)\);', source).group(1)
+        reverse = re.search(r"var +%s *\= *'(.*)';" % varname, source).group(1)
+    except AttributeError:
+        raise UnpackingError('Malformed MyObfuscate data.')
+    try:
+        return base64.b64decode(reverse[::-1].encode('utf8')).decode('utf8')
+    except TypeError:
+        raise UnpackingError('MyObfuscate payload is not base64-encoded.')