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#!/usr/bin/env python3
#
# Copyright (C) 2022 VyOS maintainers and contributors
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 or later as
# published by the Free Software Foundation.
#
# 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/>.
import argparse
import os
from vyos.util import popen
from secrets import token_hex
from base64 import b32encode
if os.geteuid() != 0:
exit("You need to have root privileges to run this script.\nPlease try again, this time using 'sudo'. Exiting.")
if __name__ == '__main__':
parser = argparse.ArgumentParser()
parser.add_argument("-u", "--username", type=str, help='Username used for authentication', required=True)
parser.add_argument("-l", "--rate_limit", type=str, help='Limit number of logins (rate-limit) per rate-time (default: 3)', default="3", required=False)
parser.add_argument("-t", "--rate_time", type=str, help='Limit number of logins (rate-limit) per rate-time (default: 30)', default="30", required=False)
parser.add_argument("-w", "--window_size", type=str, help='Set window of concurrently valid codes (default: 3)', default="3", required=False)
parser.add_argument("-i", "--interval", type=str, help='Duration of single time interval', default="30", required=False)
parser.add_argument("-d", "--digits", type=str, help='The number of digits in the one-time password', default="6", required=False)
args = parser.parse_args()
hostname = os.uname()[1]
username = args.username
rate_limit = args.rate_limit
rate_time = args.rate_time
window_size = args.window_size
digits = args.digits
period = args.interval
# check variables:
if int(rate_limit) < 1 or int(rate_limit) > 10:
print("")
quit("Number of logins (rate-limit) must be between '1' and '10'")
if int(rate_time) < 15 or int(rate_time) > 600:
print("")
quit("The rate-time must be between '15' and '600' seconds")
if int(window_size) < 1 or int(window_size) > 21:
print("")
quit("Window of concurrently valid codes must be between '1' and '21' seconds")
# generate OTP key, URL & QR:
key_hex = token_hex(20)
key_base32 = b32encode(bytes.fromhex(key_hex)).decode()
otp_url=''.join(["otpauth://totp/",username,"@",hostname,"?secret=",key_base32,"&digits=",digits,"&period=",period])
qrcode,err = popen('qrencode -t ansiutf8', input=otp_url)
print("# You can share it with the user, he just needs to scan the QR in his OTP app")
print("# username: ", username)
print("# OTP KEY: ", key_base32)
print("# OTP URL: ", otp_url)
print(qrcode)
print('# To add this OTP key to configuration, run the following commands:')
print(f"set system login user {username} authentication otp key '{key_base32}'")
if rate_limit != "3":
print(f"set system login user {username} authentication otp rate-limit '{rate_limit}'")
if rate_time != "30":
print(f"set system login user {username} authentication otp rate-time '{rate_time}'")
if window_size != "3":
print(f"set system login user {username} authentication otp window-size '{window_size}'")
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