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JsEngine.py
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JsEngine.py
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#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License,
or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, see <http://www.gnu.org/licenses/>.
@author: RaNaN
"""
from __future__ import with_statement
import os
import tempfile
import urllib
from imp import find_module
ENGINE = ""
DEBUG = False
JS = False
PYV8 = False
NODE = False
RHINO = False
JS2PY = False
if not ENGINE:
try:
import js2py
out = js2py.eval_js("(23+19).toString()")
# integrity check
if out.strip() == "42":
ENGINE = "js2py"
def monkey_patch():
"""Patching js2py for CVE-2024-28397"""
from js2py.constructors.jsobject import Object
fn = Object.own["getOwnPropertyNames"]["value"].code
def wraps(*args, **kwargs):
result = fn(*args, **kwargs)
return list(result)
Object.own["getOwnPropertyNames"]["value"].code = wraps
monkey_patch()
js2py.disable_pyimport()
JS2PY = True
except:
pass
if not ENGINE or DEBUG:
try:
import subprocess
subprocess.Popen(["js", "-v"], bufsize=-1, stdout=subprocess.PIPE, stderr=subprocess.PIPE).communicate()
p = subprocess.Popen(["js", "-e", "print(23+19)"], stdout=subprocess.PIPE, stderr=subprocess.PIPE)
out, err = p.communicate()
#integrity check
if out.strip() == "42":
ENGINE = "js"
JS = True
except:
pass
if not ENGINE or DEBUG:
try:
find_module("PyV8")
ENGINE = "pyv8"
PYV8 = True
except:
pass
if not ENGINE or DEBUG:
try:
import subprocess
subprocess.Popen(["node", "-v"], bufsize=-1, stdout=subprocess.PIPE, stderr=subprocess.PIPE).communicate()
p = subprocess.Popen(["node", "-e", "console.log(23+19)"], stdout=subprocess.PIPE, stderr=subprocess.PIPE)
out, err = p.communicate()
#integrity check
if out.strip() == "42":
ENGINE = "node"
NODE = True
except:
pass
if not ENGINE or DEBUG:
try:
path = "" #path where to find rhino
if os.path.exists("/usr/share/java/js.jar"):
path = "/usr/share/java/js.jar"
elif os.path.exists("js.jar"):
path = "js.jar"
elif os.path.exists(os.path.join(pypath, "js.jar")): #may raises an exception, but js.jar wasnt found anyway
path = os.path.join(pypath, "js.jar")
if not path:
raise Exception
import subprocess
p = subprocess.Popen(["java", "-cp", path, "org.mozilla.javascript.tools.shell.Main", "-e", "print(23+19)"],
stdout=subprocess.PIPE, stderr=subprocess.PIPE)
out, err = p.communicate()
#integrity check
if out.strip() == "42":
ENGINE = "rhino"
RHINO = True
except:
pass
class JsEngine():
def __init__(self):
self.engine = ENGINE
self.init = False
def __nonzero__(self):
return False if not ENGINE else True
def eval(self, script):
if not self.init:
if ENGINE == "pyv8" or (DEBUG and PYV8):
import PyV8
global PyV8
self.init = True
if type(script) == unicode:
script = script.encode("utf8")
if not ENGINE:
raise Exception("No JS Engine")
if not DEBUG:
if ENGINE == "pyv8":
return self.eval_pyv8(script)
elif ENGINE == "js2py":
return self.eval_js2py(script)
elif ENGINE == "js":
return self.eval_js(script)
elif ENGINE == "node":
return self.eval_node(script)
elif ENGINE == "rhino":
return self.eval_rhino(script)
else:
results = []
if PYV8:
res = self.eval_pyv8(script)
print "PyV8:", res
results.append(res)
if JS2PY:
res = self.eval_js2py(script)
print "js2py:", res
results.append(res)
if JS:
res = self.eval_js(script)
print "JS:", res
results.append(res)
if NODE:
res = self.eval_node(script)
print "NODE:", res
results.append(res)
if RHINO:
res = self.eval_rhino(script)
print "Rhino:", res
results.append(res)
warning = False
for x in results:
for y in results:
if x != y:
warning = True
if warning: print "### WARNING ###: Different results"
return results[0]
def eval_pyv8(self, script):
with PyV8.JSLocker():
with PyV8.JSContext() as rt:
return rt.eval(script)
def eval_js(self, script):
script = "print(eval(unescape('%s')))" % urllib.quote(script)
if len(script) <= 2000:
script_file = None
p = subprocess.Popen(["js", "-e", script], stdout=subprocess.PIPE, stderr=subprocess.STDOUT, bufsize=-1)
else:
fd, script_file = tempfile.mkstemp(prefix='script_file_', suffix='.js', dir="tmp")
os.write(fd, script)
os.close(fd)
p = subprocess.Popen(["js", "-f", script_file], stdout=subprocess.PIPE, stderr=subprocess.STDOUT, bufsize=-1)
out, err = p.communicate()
if script_file and os.path.exists(script_file):
os.unlink(script_file)
res = out.strip()
return res
def eval_js2py(self, script):
script = "(eval(unescape('%s'))).toString()" % urllib.quote(script)
res = js2py.eval_js(script).strip()
return res
def eval_node(self, script):
script = "console.log(eval(unescape('%s')))" % urllib.quote(script)
if len(script) <= 2000:
script_file = None
p = subprocess.Popen(["node", "-e", script], stdout=subprocess.PIPE, stderr=subprocess.STDOUT, bufsize=-1)
else:
fd, script_file = tempfile.mkstemp(prefix='script_file_', suffix='.js', dir="tmp")
os.write(fd, script)
os.close(fd)
p = subprocess.Popen(["node",script_file], stdout=subprocess.PIPE, stderr=subprocess.STDOUT, bufsize=-1)
out, err = p.communicate()
if script_file and os.path.exists(script_file):
os.unlink(script_file)
res = out.strip()
return res
def eval_rhino(self, script):
script = "print(eval(unescape('%s')))" % urllib.quote(script)
if len(script) <= 1800:
script_file = None
p = subprocess.Popen(["java", "-cp", path, "org.mozilla.javascript.tools.shell.Main", "-e", script],
stdout=subprocess.PIPE, stderr=subprocess.STDOUT, bufsize=-1)
else:
fd, script_file = tempfile.mkstemp(prefix='script_file_', suffix='.js', dir="tmp")
os.write(fd, script)
os.close(fd)
p = subprocess.Popen(["java", "-cp", path, "org.mozilla.javascript.tools.shell.Main", "-f", script_file],
stdout=subprocess.PIPE, stderr=subprocess.STDOUT, bufsize=-1)
out, err = p.communicate()
if script_file and os.path.exists(script_file):
os.unlink(script_file)
res = out.strip()
return res.decode("utf8").encode("ISO-8859-1")
def error(self):
return _("No js engine detected, please install either js2py, Spidermonkey, ossp-js, pyv8, nodejs or rhino")
if __name__ == "__main__":
js = JsEngine()
test = u'"ü"+"ä"'
js.eval(test)