dash/share/rpcauth/rpcauth.py
Wladimir J. van der Laan 5b38df433f
Merge #14756: Improve rpcauth.py by using argparse and getpass modules
d6cde007db9d3e6ee93bd98a9bbfdce9bfa9b15b rpcauth: Improve by using argparse and getpass modules (João Barbosa)

Pull request description:

  This PR improves argument handling in `rpcauth.py` script by using `argparse` module. Specifying `-` as password makes it prompt securely with `getpass` module which prevents leaking passwords to bash history.

Tree-SHA512: 489d66c95f66b5618cb75fd8f07ea5647281226ab9e32b03051eb43f758b9334ac19b7c82c2ed4f8c7ffbb0bee949b3d389e1564ec7a6e372f2864233bc7cb88
2020-07-22 12:12:46 -05:00

47 lines
1.5 KiB
Python
Executable File

#!/usr/bin/env python3
# Copyright (c) 2015-2017 The Bitcoin Core developers
# Distributed under the MIT software license, see the accompanying
# file COPYING or http://www.opensource.org/licenses/mit-license.php.
from argparse import ArgumentParser
from base64 import urlsafe_b64encode
from binascii import hexlify
from getpass import getpass
from os import urandom
import hmac
def generate_salt(size):
"""Create size byte hex salt"""
return hexlify(urandom(size)).decode()
def generate_password():
"""Create 32 byte b64 password"""
return urlsafe_b64encode(urandom(32)).decode('utf-8')
def password_to_hmac(salt, password):
m = hmac.new(bytearray(salt, 'utf-8'), bytearray(password, 'utf-8'), 'SHA256')
return m.hexdigest()
def main():
parser = ArgumentParser(description='Create login credentials for a JSON-RPC user')
parser.add_argument('username', help='the username for authentication')
parser.add_argument('password', help='leave empty to generate a random password or specify "-" to prompt for password', nargs='?')
args = parser.parse_args()
if not args.password:
args.password = generate_password()
elif args.password == '-':
args.password = getpass()
# Create 16 byte hex salt
salt = generate_salt(16)
password_hmac = password_to_hmac(salt, args.password)
print('String to be appended to bitcoin.conf:')
print('rpcauth={0}:{1}${2}'.format(args.username, salt, password_hmac))
print('Your password:\n{0}'.format(args.password))
if __name__ == '__main__':
main()