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# -*- coding: utf-8 -*-
#
# This file is part of Glances.
#
# Copyright (C) 2019 Nicolargo <nicolas@nicolargo.com>
#
# Glances is free software; you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Glances 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 Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
"""Manage password."""
import getpass
import hashlib
import os
import sys
import uuid
from io import open
from glances.compat import b, input
from glances.config import user_config_dir
from glances.globals import safe_makedirs
from glances.logger import logger
class GlancesPassword(object):
"""This class contains all the methods relating to password."""
def __init__(self, username='glances'):
self.username = username
self.password_dir = user_config_dir()
self.password_filename = self.username + '.pwd'
self.password_file = os.path.join(self.password_dir, self.password_filename)
def sha256_hash(self, plain_password):
"""Return the SHA-256 of the given password."""
return hashlib.sha256(b(plain_password)).hexdigest()
def get_hash(self, salt, plain_password):
"""Return the hashed password, salt + SHA-256."""
return hashlib.sha256(salt.encode() + plain_password.encode()).hexdigest()
def hash_password(self, plain_password):
"""Hash password with a salt based on UUID (universally unique identifier)."""
salt = uuid.uuid4().hex
encrypted_password = self.get_hash(salt, plain_password)
return salt + '$' + encrypted_password
def check_password(self, hashed_password, plain_password):
"""Encode the plain_password with the salt of the hashed_password.
Return the comparison with the encrypted_password.
"""
salt, encrypted_password = hashed_password.split('$')
re_encrypted_password = self.get_hash(salt, plain_password)
return encrypted_password == re_encrypted_password
def get_password(self, description='', confirm=False, clear=False):
"""Get the password from a Glances client or server.
For Glances server, get the password (confirm=True, clear=False):
1) from the password file (if it exists)
2) from the CLI
Optionally: save the password to a file (hashed with salt + SHA-256)
For Glances client, get the password (confirm=False, clear=True):
1) from the CLI
2) the password is hashed with SHA-256 (only SHA string transit
through the network)
"""
if os.path.exists(self.password_file) and not clear:
# If the password file exist then use it
logger.info("Read password from file {}".format(self.password_file))
password = self.load_password()
else:
# password_sha256 is the plain SHA-256 password
# password_hashed is the salt + SHA-256 password
password_sha256 = self.sha256_hash(getpass.getpass(description))
password_hashed = self.hash_password(password_sha256)
if confirm:
# password_confirm is the clear password (only used to compare)
password_confirm = self.sha256_hash(getpass.getpass('Password (confirm): '))
if not self.check_password(password_hashed, password_confirm):
logger.critical("Sorry, passwords do not match. Exit.")
sys.exit(1)
# Return the plain SHA-256 or the salted password
if clear:
password = password_sha256
else:
password = password_hashed
# Save the hashed password to the password file
if not clear:
save_input = input('Do you want to save the password? [Yes/No]: ')
if len(save_input) > 0 and save_input[0].upper() == 'Y':
self.save_password(password_hashed)
return password
def save_password(self, hashed_password):
"""Save the hashed password to the Glances folder."""
# Create the glances directory
safe_makedirs(self.password_dir)
# Create/overwrite the password file
with open(self.password_file, 'wb') as file_pwd:
file_pwd.write(b(hashed_password))
def load_password(self):
"""Load the hashed password from the Glances folder."""
# Read the password file, if it exists
with open(self.password_file, 'r') as file_pwd:
hashed_password = file_pwd.read()
return hashed_password
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