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#!/usr/bin/env python3
#
# Copyright (C) 2020 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 sys
import os
from pwd import getpwall, getpwnam
from stat import S_IRUSR, S_IWUSR, S_IRWXU, S_IRGRP, S_IXGRP
from subprocess import Popen, PIPE, STDOUT
from vyos.config import Config
from vyos.configdict import list_diff
from vyos import ConfigError
default_config_data = {
'deleted': False,
'add_users': [],
'del_users': []
}
def get_local_users():
"""Returns list of dynamically allocated users (see Debian Policy Manual)"""
local_users = []
for p in getpwall():
username = p[0]
uid = getpwnam(username).pw_uid
if uid in range(1000, 29999):
if username not in ['radius_user', 'radius_priv_user']:
local_users.append(username)
return local_users
def get_crypt_pw(password):
command = '/usr/bin/mkpasswd --method=sha-512 {}'.format(password)
p = Popen(command, stdout=PIPE, stderr=STDOUT, shell=True)
tmp = p.communicate()[0].strip()
return tmp.decode()
def get_config():
login = default_config_data
conf = Config()
base_level = ['system', 'login', 'user']
# We do not need to check if the nodes exist or not and bail out early
# ... this would interrupt the following logic on determine which users
# should be deleted and which users should stay.
#
# All fine so far!
# Read in all local users and store to list
for username in conf.list_nodes(base_level):
user = {
'name': username,
'password_plaintext': '',
'password_encrypted': '!',
'public_keys': [],
'full_name': '',
'home_dir': '/home/' + username,
}
conf.set_level(base_level + [username])
# Plaintext password
if conf.exists(['authentication', 'plaintext-password']):
user['password_plaintext'] = conf.return_value(['authentication', 'plaintext-password'])
# Encrypted password
if conf.exists(['authentication', 'encrypted-password']):
user['password_encrypted'] = conf.return_value(['authentication', 'encrypted-password'])
# User real name
if conf.exists(['full-name']):
user['full_name'] = conf.return_value(['full-name'])
# User home-directory
if conf.exists(['home-directory']):
user['home_dir'] = conf.return_value(['home-directory'])
# Read in public keys
for id in conf.list_nodes(['authentication', 'public-keys']):
key = {
'name': id,
'key': '',
'options': '',
'type': ''
}
conf.set_level(base_level + [username, 'authentication', 'public-keys', id])
# Public Key portion
if conf.exists(['key']):
key['key'] = conf.return_value(['key'])
# Options for individual public key
if conf.exists(['options']):
key['options'] = conf.return_value(['options'])
# Type of public key
if conf.exists(['type']):
key['type'] = conf.return_value(['type'])
# Append individual public key to list of user keys
user['public_keys'].append(key)
login['add_users'].append(user)
# users no longer existing in the running configuration need to be deleted
local_users = get_local_users()
cli_users = [tmp['name'] for tmp in login['add_users']]
# create a list of all users, cli and users
all_users = list(set(local_users+cli_users))
# Remove any normal users that dos not exist in the current configuration.
# This can happen if user is added but configuration was not saved and
# system is rebooted.
login['del_users'] = [tmp for tmp in all_users if tmp not in cli_users]
return login
def verify(login):
cur_user = os.environ['SUDO_USER']
if cur_user in login['del_users']:
raise ConfigError('Attempting to delete current user: {}'.format(cur_user))
pass
def generate(login):
# calculate users encrypted password
for user in login['add_users']:
if user['password_plaintext']:
user['password_encrypted'] = get_crypt_pw(user['password_plaintext'])
user['password_plaintext'] = ''
# remove old plaintext password
# and set new encrypted password
os.system("vyos_libexec_dir=/usr/libexec/vyos /opt/vyatta/sbin/my_set system login user '{}' authentication plaintext-password '' >/dev/null".format(user['name']))
os.system("vyos_libexec_dir=/usr/libexec/vyos /opt/vyatta/sbin/my_set system login user '{}' authentication encrypted-password '{}' >/dev/null".format(user['name'], user['password_encrypted']))
return None
def apply(login):
for user in login['add_users']:
# make new user using vyatta shell and make home directory (-m),
# default group of 100 (users)
cmd = "useradd -m -N"
# check if user already exists:
if user['name'] in get_local_users():
# update existing account
cmd = "usermod"
# encrypted password must be quited in '' else it won't work!
cmd += ' -p "{}"'.format(user['password_encrypted'])
cmd += ' -s /bin/vbash'
if user['full_name']:
cmd += ' -c "{}"'.format(user['full_name'])
if user['home_dir']:
cmd += ' -d "{}"'.format(user['home_dir'])
cmd += ' -G frrvty,vyattacfg,sudo,adm,dip,disk'
cmd += ' {}'.format(user['name'])
try:
os.system(cmd)
uid = getpwnam(user['name']).pw_uid
gid = getpwnam(user['name']).pw_gid
# install ssh keys
key_dir = '{}/.ssh'.format(user['home_dir'])
if not os.path.isdir(key_dir):
os.mkdir(key_dir)
os.chown(key_dir, uid, gid)
os.chmod(key_dir, S_IRWXU | S_IRGRP | S_IXGRP)
key_file = key_dir + '/authorized_keys';
with open(key_file, 'w') as f:
f.write("# Automatically generated by VyOS\n")
f.write("# Do not edit, all changes will be lost\n")
for id in user['public_keys']:
line = ''
if id['options']:
line = '{} '.format(id['options'])
line += '{} {} {}\n'.format(id['type'], id['key'], id['name'])
f.write(line)
os.chown(key_file, uid, gid)
os.chmod(key_file, S_IRUSR | S_IWUSR)
except Exception as e:
print('Adding user "{}" raised an exception: {}'.format(user['name'], e))
for user in login['del_users']:
try:
# TODO: check if user is logged in and force logout
# Remove user account but leave home directory to be safe
os.system('userdel {}'.format(user))
except Exception as e:
print('Deleting user "{}" raised an exception'.format(user))
return None
if __name__ == '__main__':
try:
c = get_config()
verify(c)
generate(c)
apply(c)
except ConfigError as e:
print(e)
sys.exit(1)
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