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127 lines
3.6 KiB
Python
127 lines
3.6 KiB
Python
#!/usr/bin/env python
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from __future__ import print_function
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'''
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Use TREZOR as a hardware key for opening EncFS filesystem!
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Usage:
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encfs --standard --extpass=./encfs_aes_getpass.py ~/.crypt ~/crypt
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'''
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import os
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import sys
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import json
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import hashlib
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import binascii
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from trezorlib.client import TrezorClient, TrezorClientDebug
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from trezorlib.transport_hid import HidTransport
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# Python2 vs Python3
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try:
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input = raw_input
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except NameError:
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pass
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def wait_for_devices():
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devices = HidTransport.enumerate()
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while not len(devices):
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sys.stderr.write("Please connect TREZOR to computer and press Enter...")
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input()
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devices = HidTransport.enumerate()
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return devices
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def choose_device(devices):
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if not len(devices):
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raise Exception("No TREZOR connected!")
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if len(devices) == 1:
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try:
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return HidTransport(devices[0])
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except IOError:
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raise Exception("Device is currently in use")
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i = 0
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sys.stderr.write("----------------------------\n")
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sys.stderr.write("Available devices:\n")
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for d in devices:
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try:
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t = HidTransport(d)
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except IOError:
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sys.stderr.write("[-] <device is currently in use>\n")
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continue
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client = TrezorClient(t)
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if client.features.label:
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sys.stderr.write("[%d] %s\n" % (i, client.features.label))
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else:
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sys.stderr.write("[%d] <no label>\n" % i)
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t.close()
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i += 1
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sys.stderr.write("----------------------------\n")
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sys.stderr.write("Please choose device to use:")
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try:
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device_id = int(input())
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return HidTransport(devices[device_id])
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except:
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raise Exception("Invalid choice, exiting...")
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def main():
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if not 'encfs_root' in os.environ:
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sys.stderr.write('\nThis is not a standalone script and is not meant to be run independently.\n')
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sys.stderr.write('\nUsage: encfs --standard --extpass=./encfs_aes_getpass.py ~/.crypt ~/crypt\n')
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sys.exit(1)
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devices = wait_for_devices()
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transport = choose_device(devices)
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client = TrezorClient(transport)
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rootdir = os.environ['encfs_root'] # Read "man encfs" for more
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passw_file = os.path.join(rootdir, 'password.dat')
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if not os.path.exists(passw_file):
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# New encfs drive, let's generate password
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sys.stderr.write('Please provide label for new drive: ')
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label = input()
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sys.stderr.write('Computer asked TREZOR for new strong password.\n')
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sys.stderr.write('Please confirm action on your device.\n')
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# 32 bytes, good for AES
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trezor_entropy = client.get_entropy(32)
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urandom_entropy = os.urandom(32)
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passw = hashlib.sha256(trezor_entropy + urandom_entropy).digest()
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if len(passw) != 32:
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raise Exception("32 bytes password expected")
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bip32_path = [10, 0]
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passw_encrypted = client.encrypt_keyvalue(bip32_path, label, passw, False, True)
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data = {'label': label,
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'bip32_path': bip32_path,
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'password_encrypted_hex': binascii.hexlify(passw_encrypted)}
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json.dump(data, open(passw_file, 'wb'))
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# Let's load password
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data = json.load(open(passw_file, 'r'))
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sys.stderr.write('Please confirm action on your device.\n')
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passw = client.decrypt_keyvalue(data['bip32_path'],
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data['label'],
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binascii.unhexlify(data['password_encrypted_hex']),
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False, True)
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print(passw)
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if __name__ == '__main__':
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main()
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