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#!/usr/bin/env python3
import sys
if not sys.version.startswith('3'):
print('\n[-] This script will only work with Python3. Sorry!\n')
exit()
import urllib.request
import subprocess
import os
import shutil
import argparse
try:
import OpenSSL
except ImportError:
print("[-] This script requires pyOpenSSL. Try 'python3 -m pip install pyopenssl' or consult the Internet for installation instructions.")
exit()
__author__ = "Jake Miller (@LaconicWolf)"
__date__ = "20190705"
__version__ = "0.01"
__description__ = '''A script to help install a Burp proxy certificate on Android devices prior to Nougat.
Largely based on https://blog.ropnop.com/configuring-burp-suite-with-android-nougat/'''
def check_for_tools(name):
"""Checks to see whether the tool name is in current directory or in the PATH"""
if is_in_dir(name) or is_in_path(name):
return True
else:
return False
def check_for_burp(host, port):
"""Checks to see if Burp is running."""
url = ("http://{}:{}/".format(host, port))
try:
resp = urllib.request.urlopen(url)
except urllib.error.URLError as e:
return False
if b"Burp Suite" in resp.read():
return True
else:
return False
def download_burp_cert(host, port):
"""Downloads the Burp Suite certificate."""
url = ("http://{}:{}/cert".format(host, port))
file_name = 'cacert.cer'
# Download the file from url and save it locally under file_name:
try:
with urllib.request.urlopen(url) as response, open(file_name, 'wb') as out_file:
data = response.read() # a bytes object
out_file.write(data)
return file_name
except Exception as e:
print('[-] An error occurred: {}'.format(e))
exit()
def is_in_path(name):
"""Check whether name is on PATH and marked as executable.
https://stackoverflow.com/questions/11210104/check-if-a-program-exists-from-a-python-script/34177358
"""
return shutil.which(name) is not None
def is_in_dir(name, directory='.'):
"""Checks whether a file exists in a specified directory."""
files = (os.listdir(directory))
for file in files:
if file.lower() == name.lower():
if os.path.isfile(file):
return True
def get_devices():
"""Uses adb to get a list of attached devices. The output string is formatted
to a list, and returned.
"""
devices = subprocess.getoutput("adb devices").split('List of devices attached\n')[1]
if not devices:
return False
else:
device_list = devices.split('\n')
return device_list
def get_build_version_info(device_id):
"""Returns the build release as an integer"""
ver = subprocess.getoutput("adb -s {} shell getprop ro.build.version.release".format(device_id))
return int(ver[0])
def select_device(device_list):
"""Prompts a user to select a device from a list of devices."""
print('[*] The following devices were found:')
print('{}'.format('\n'.join(device_list)))
while True:
device = input('[*] Please enter the device you\'d like to use or type \'quit\' to exit:\n')
if device.lower() == 'quit':
exit()
if device and device.lower() in [d.lower() for d in device_list]:
return device
else:
print('[-] {} is not a valid choice. Type \'quit\' to exit, or select from the following options: \n{}'.format(device, '\n'.join(device_list)))
def check_for_root(device_id):
"""Uses ADB to see if we have root privileges."""
uid = subprocess.getoutput("adb -s {} shell id".format(device_id))
if "uid=0(root)" in uid:
return True
else:
return False
def get_root(device_id):
"""Uses ADB to try to get root privileges."""
output = subprocess.getoutput("adb -s {} root".format(device_id))
def convert_der_to_pem(filename):
"""Converts a der to a pem and writes to the filesystem."""
with open(filename, 'rb') as fh:
der = fh.read()
cert = OpenSSL.crypto.load_certificate(type=OpenSSL.crypto.FILETYPE_ASN1, buffer=der)
# OpenSSL and pyOpenSSL coming up with different hashes. Hardcoding it for now.
pem_hash = '9a5ba575' # str(cert.subject_name_hash())
pem_bytes = OpenSSL.crypto.dump_certificate(OpenSSL.crypto.FILETYPE_PEM, cert)
pem_filename = pem_hash + ".0"
with open(pem_filename, 'wb') as fh:
fh.write(pem_bytes)
return pem_filename
def remount_system(device_id):
"""Uses ADB to remount the /system as writable"""
output = subprocess.getoutput("adb -s {} remount".format(device_id))
if 'remount succeeded' in output:
return True
elif 'remount failed' in output:
return False
def move_pem_to_device(pem_file, device_id):
output = subprocess.getoutput("adb -s {} push {} /sdcard/".format(device_id, pem_file))
output = subprocess.getoutput("adb -s {} shell mv /sdcard/{} /system/etc/security/cacerts/".format(device_id, pem_file))
if 'Read-only file system' in output:
return False
elif 'failed on' in output:
cpout = subprocess.getoutput("adb -s {} shell cp /sdcard/{} /system/etc/security/cacerts/".format(device_id, pem_file))
if 'failed' in cpout or 'Read-only' in cpout:
return False
else:
return True
else:
return True
def change_perms(filename, device_id):
"""Changes perms to 644 for cert file name."""
output = subprocess.getoutput("adb -s {} shell chmod 644 /system/etc/security/cacerts/{}".format(device_id, filename))
def reboot_device(device_id):
"""Reboots a device."""
output = subprocess.getoutput("adb -s {} shell reboot".format(device_id))
def main():
"""Checks for tools and burp, determines information about any devices,
and attempts to convert and install the Burp cert on a specific device.
"""
# Check for adb and burp. May check for openssl in the future...
required_tools = ("adb",)
missing_tools = []
for tool in required_tools:
if not check_for_tools(tool):
missing_tools.append(tool)
burp = check_for_burp(burp_host, burp_port)
if not burp or missing_tools:
if not burp:
print('[-] Unable to connect to Burp at {}:{}. Please ensure the Burp web UI is running and available.'.format(burp_host, burp_port))
for tool in missing_tools:
print("[-] {} could not be found in the current directory or in your PATH. Please ensure either of these conditions are met.".format(tool))
# Check for connected devices
print('[*] Checking for connected devices')
connected_devices = get_devices()
if not connected_devices:
print("[-] No devices/emulators found. Make sure adb is running and that a device is connected.")
exit()
connected_devices = [d.split('\t')[0] for d in connected_devices]
connected_devices = list(filter(None, connected_devices))
if not connected_devices:
print("[-] No devices/emulators found. Make sure adb is running and that a device is connected.")
if len(connected_devices) > 1:
device = select_device(connected_devices)
else:
device = ''.join(connected_devices)
# Checks to see if the device is at the API level where the cert
# installation will even matter. After Marshmallow, this won't matter,
# we can just exit if it is build 7 or later.
print("[*] Checking API level.")
rel = get_build_version_info(device)
if rel >= 7:
print("[-] The build version on this device will not respect a user installed certificate. Try repackaging the APK.")
exit()
# Checks for root. This also requires a rooted device. Otherwise exit.
print("[*] Checking for root privileges.")
is_rooted = check_for_root(device)
if is_rooted:
print('[*] Root privileges verified.')
else:
get_root(device)
is_rooted = check_for_root(device)
if is_rooted:
print("[+] Device rooted using 'adb -s {} root'.".format(device))
else:
print("[-] Unable to use 'adb -s {} root' to root the device.".format(device))
print('[-] Root is required for this method. Exiting.')
exit()
# Attempt to download and convert the cert from der to pem
print("[*] Attempting to add the Burp CA cert to the device")
print("[*] Downloading cert from http://{}:{}".format(burp_host, burp_port))
certname = download_burp_cert(burp_host, burp_port)
print("[*] Converting Burp Cert to pem")
pem_file = convert_der_to_pem(certname)
print("[*] PEM file written to {}".format(pem_file))
# Adds the cert. Have to make /system writable first. Requires
# an emulated device to be started with -writable-system.
print("[*] Attempting to add cert to device")
print("[*] Remounting /system")
if not remount_system(device):
print('[-] Unable to mount /system as read write. If running an emulator, please include -writable-system in the command line arguments (emulator -avd <avd_name> -writable-system)')
exit()
print('[*] Moving {} to the device'.format(pem_file))
if not move_pem_to_device(pem_file, device):
print('[-] Unable to mount /system as read write. If running an emulator, please include -writable-system in the command line arguments (emulator -avd <avd_name> -writable-system)')
exit()
# Change permissions on the file to 644, and then restart.
print('[*] Changing permissions on the file.')
change_perms(pem_file, device)
print('[+] Success. Rebooting device. The cert should work without error after reboot.')
reboot_device(device)
if __name__ == '__main__':
parser = argparse.ArgumentParser()
parser.add_argument("-pr", "--proxy",
nargs='?',
const="127.0.0.1:8080",
default="127.0.0.1:8080",
help="Specify a proxy to use (default 127.0.0.1:8080)")
args = parser.parse_args()
if args.proxy.startswith('http'):
if '://' not in args.proxy:
print("[-] Unknown format for proxy. Please specify only a host and port (-pr 127.0.0.1:8080")
exit()
args.proxy = ''.join(args.proxy.split("//")[1:])
burp_host = args.proxy.split(":")[0]
burp_port = int(args.proxy.split(":")[1])
main()
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