/
permission_scanner.py
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/
permission_scanner.py
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#!/usr/bin/env python
# -*- coding: utf-8 -*-
'''
Created on 2014-4-2
@author: Wenjun Hu
'''
# Global import
import logging, os
# Androguard import
#from androguard.core.bytecode import *
from androguard.core.bytecodes.dvm import DalvikVMFormat
from androguard.core.bytecodes.apk import APK
from androguard.core.analysis.analysis import VMAnalysis
# PermissionSanner import
from application.application import *
from util.util import *
from permissions_map.permissions import PERMISSIONS
# Logger
LOG_FILE = r'log.txt'
log = logging.getLogger('log')
log.setLevel(logging.INFO)
formatter = logging.Formatter('[%(asctime)s %(levelname)s] %(message)s')
handler = logging.StreamHandler(open(LOG_FILE, 'a', 0))
handler.setFormatter(formatter)
log.addHandler(handler)
class PermissionScanner():
def __init__(self, apk_file, extract_string=False):
self.__apk_file = apk_file
self.__apk = None
self.__unclaimed_permissions = []
def start_analysis(self):
try:
if not os.path.exists(self.__apk_file):
log.warn("%s not exists" % self.__apk_file)
return
# Create APK instance
try:
self.__apk = APK(self.__apk_file, raw=False)
except Exception, ex:
log.exception(ex)
return
if self.__apk == None:
log.error('Fail to create APK instance')
return
# Analyze unclaimed permissions
log.info('Start analyzing %s...' % self.__apk_file)
self.__unclaimed_permissions = self.__analyze_apk(self.__apk)
# Analysis done
log.info('Analysis for %s done' % self.__apk_file)
except Exception, ex:
log.exception(ex)
def __analyze_apk(self, apk, raw=False):
unclaimed_permissions = []
# Create VMAnalysis instance
try:
vm_analysis = self.__analyze_dex(apk.get_dex(), raw=True)
except Exception, ex:
log.exception(ex)
return unclaimed_permissions
# Perform analysis
try:
unclaimed_permissions = self.__perform_analysis(apk, vm_analysis)
except Exception, ex:
log.exception(ex)
return unclaimed_permissions
return unclaimed_permissions
def __analyze_dex(self, dex_file, raw=False) :
# DalvikVMFormat
dalvik_vm_format = None
if raw == False :
dalvik_vm_format = DalvikVMFormat( open(dex_file, "rb").read() )
else :
dalvik_vm_format = DalvikVMFormat( dex_file )
# VMAnalysis
vm_analysis = VMAnalysis( dalvik_vm_format )
dalvik_vm_format.set_vmanalysis( vm_analysis )
return vm_analysis
def __perform_analysis(self, apk, vm_analysis):
# Get permissions and remove duplicate ones
manifest_permissions = set(apk.get_permissions())
all_permissions = set(PERMISSIONS)
manifest_permissions = list(all_permissions & manifest_permissions)
used_permissions = []
# Get manifest intents
manifest_intents = get_manifest_intents(apk)
# Search APIs
for tainted_package,_ in vm_analysis.tainted_packages.get_packages():
paths = tainted_package.get_methods()
class_name = tainted_package.get_name()
for path in paths:
api_tuple = (class_name, path.get_name())
permission = get_permission_by_api(api_tuple)
if permission:
used_permissions.append(permission)
# If need search string
if(len(used_permissions) != (len(manifest_permissions))):
# Search strings
for s, _ in vm_analysis.tainted_variables.get_strings() :
string_info = s.get_info()
permission = get_permission_by_intent(string_info)
if not permission:
permission = get_permission_by_contentprovider(string_info)
if permission:
used_permissions.append(permission)
# If need search manifest intents
if(len(used_permissions) != (len(manifest_permissions))):
for intent in manifest_intents:
permission = get_permission_by_intent(intent)
if permission:
used_permissions.append(permission)
unclaimed_permissions = list(set(manifest_permissions) - set(used_permissions))
return unclaimed_permissions
def get_unclaimed_permissions(self):
"""
@rtype : a list of strings
"""
return self.__unclaimed_permissions
# Run
if __name__ == '__main__':
test_apk = r'test.apk'
# Create PermissionScanner instance
permission_scanner = PermissionScanner(test_apk, extract_string=True)
# start analyze
permission_scanner.start_analysis()
# Get unclamed permissions
print 'unclaimed permissions:', permission_scanner.get_unclaimed_permissions()