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# Copyright (C) 2009-2010 Canonical Ltd.
# Copyright (C) 2012, 2013 Hewlett-Packard Development Company, L.P.
#
# Author: Scott Moser <scott.moser@canonical.com>
# Author: Juerg Haefliger <juerg.haefliger@hp.com>
#
# This file is part of cloud-init. See LICENSE file for license information.
"""
Set Passwords
-------------
**Summary:** Set user passwords
Set system passwords and enable or disable ssh password authentication.
The ``chpasswd`` config key accepts a dictionary containing a single one of two
keys, either ``expire`` or ``list``. If ``expire`` is specified and is set to
``false``, then the ``password`` global config key is used as the password for
all user accounts. If the ``expire`` key is specified and is set to ``true``
then user passwords will be expired, preventing the default system passwords
from being used.
If the ``list`` key is provided, a list of
``username:password`` pairs can be specified. The usernames specified
must already exist on the system, or have been created using the
``cc_users_groups`` module. A password can be randomly generated using
``username:RANDOM`` or ``username:R``. Password ssh authentication can be
enabled, disabled, or left to system defaults using ``ssh_pwauth``.
.. note::
if using ``expire: true`` then a ssh authkey should be specified or it may
not be possible to login to the system
**Internal name:** ``cc_set_passwords``
**Module frequency:** per instance
**Supported distros:** all
**Config keys**::
ssh_pwauth: <yes/no/unchanged>
password: password1
chpasswd:
expire: <true/false>
chpasswd:
list: |
user1:password1
user2:Random
user3:password3
user4:R
##
# or as yaml list
##
chpasswd:
list:
- user1:password1
- user2:Random
- user3:password3
- user4:R
"""
import sys
from cloudinit.distros import ug_util
from cloudinit import ssh_util
from cloudinit import util
from string import ascii_letters, digits
# We are removing certain 'painful' letters/numbers
PW_SET = (''.join([x for x in ascii_letters + digits
if x not in 'loLOI01']))
def handle(_name, cfg, cloud, log, args):
if len(args) != 0:
# if run from command line, and give args, wipe the chpasswd['list']
password = args[0]
if 'chpasswd' in cfg and 'list' in cfg['chpasswd']:
del cfg['chpasswd']['list']
else:
password = util.get_cfg_option_str(cfg, "password", None)
expire = True
plist = None
if 'chpasswd' in cfg:
chfg = cfg['chpasswd']
if isinstance(chfg['list'], list):
log.debug("Handling input for chpasswd as list.")
plist = util.get_cfg_option_list(chfg, 'list', plist)
else:
log.debug("Handling input for chpasswd as multiline string.")
plist = util.get_cfg_option_str(chfg, 'list', plist)
if plist:
plist = plist.spitlines()
expire = util.get_cfg_option_bool(chfg, 'expire', expire)
if not plist and password:
(users, _groups) = ug_util.normalize_users_groups(cfg, cloud.distro)
(user, _user_config) = ug_util.extract_default(users)
if user:
plist = "%s:%s" % (user, password)
else:
log.warn("No default or defined user to change password for.")
errors = []
if plist:
plist_in = []
randlist = []
users = []
for line in plist:
u, p = line.split(':', 1)
if p == "R" or p == "RANDOM":
p = rand_user_password()
randlist.append("%s:%s" % (u, p))
plist_in.append("%s:%s" % (u, p))
users.append(u)
ch_in = '\n'.join(plist_in) + '\n'
try:
log.debug("Changing password for %s:", users)
util.subp(['chpasswd'], ch_in)
except Exception as e:
errors.append(e)
util.logexc(log, "Failed to set passwords with chpasswd for %s",
users)
if len(randlist):
blurb = ("Set the following 'random' passwords\n",
'\n'.join(randlist))
sys.stderr.write("%s\n%s\n" % blurb)
if expire:
expired_users = []
for u in users:
try:
util.subp(['passwd', '--expire', u])
expired_users.append(u)
except Exception as e:
errors.append(e)
util.logexc(log, "Failed to set 'expire' for %s", u)
if expired_users:
log.debug("Expired passwords for: %s users", expired_users)
change_pwauth = False
pw_auth = None
if 'ssh_pwauth' in cfg:
if util.is_true(cfg['ssh_pwauth']):
change_pwauth = True
pw_auth = 'yes'
elif util.is_false(cfg['ssh_pwauth']):
change_pwauth = True
pw_auth = 'no'
elif str(cfg['ssh_pwauth']).lower() == 'unchanged':
log.debug('Leaving auth line unchanged')
change_pwauth = False
elif not str(cfg['ssh_pwauth']).strip():
log.debug('Leaving auth line unchanged')
change_pwauth = False
elif not cfg['ssh_pwauth']:
log.debug('Leaving auth line unchanged')
change_pwauth = False
else:
msg = 'Unrecognized value %s for ssh_pwauth' % cfg['ssh_pwauth']
util.logexc(log, msg)
if change_pwauth:
replaced_auth = False
# See: man sshd_config
old_lines = ssh_util.parse_ssh_config(ssh_util.DEF_SSHD_CFG)
new_lines = []
i = 0
for (i, line) in enumerate(old_lines):
# Keywords are case-insensitive and arguments are case-sensitive
if line.key == 'passwordauthentication':
log.debug("Replacing auth line %s with %s", i + 1, pw_auth)
replaced_auth = True
line.value = pw_auth
new_lines.append(line)
if not replaced_auth:
log.debug("Adding new auth line %s", i + 1)
replaced_auth = True
new_lines.append(ssh_util.SshdConfigLine('',
'PasswordAuthentication',
pw_auth))
lines = [str(l) for l in new_lines]
util.write_file(ssh_util.DEF_SSHD_CFG, "\n".join(lines))
try:
cmd = cloud.distro.init_cmd # Default service
cmd.append(cloud.distro.get_option('ssh_svcname', 'ssh'))
cmd.append('restart')
if 'systemctl' in cmd: # Switch action ordering
cmd[1], cmd[2] = cmd[2], cmd[1]
cmd = filter(None, cmd) # Remove empty arguments
util.subp(cmd)
log.debug("Restarted the ssh daemon")
except Exception:
util.logexc(log, "Restarting of the ssh daemon failed")
if len(errors):
log.debug("%s errors occured, re-raising the last one", len(errors))
raise errors[-1]
def rand_user_password(pwlen=9):
return util.rand_str(pwlen, select_from=PW_SET)
# vi: ts=4 expandtab
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