#!/usr/bin/env python
#
# Sets password settings.
# (Password complexity, history length, minimum password length, the minimum
# and maximum password age) on a Samba4 server
#
# Copyright Matthias Dieter Wallnoefer 2009
# Copyright Andrew Kroeger 2009
# Copyright Jelmer Vernooij 2009
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
#
# 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 samba.getopt as options
import ldb
from samba.auth import system_session
from samba.samdb import SamDB
from samba.dcerpc.samr import DOMAIN_PASSWORD_COMPLEX, DOMAIN_PASSWORD_STORE_CLEARTEXT
from samba.netcmd import Command, CommandError, Option
class cmd_pwsettings(Command):
"""Sets password settings
Password complexity, history length, minimum password length, the minimum
and maximum password age) on a Samba4 server.
"""
synopsis = "(show | set <options>)"
takes_optiongroups = {
"sambaopts": options.SambaOptions,
"versionopts": options.VersionOptions,
"credopts": options.CredentialsOptions,
}
takes_options = [
Option("-H", help="LDB URL for database or target server", type=str),
Option("--quiet", help="Be quiet", action="store_true"),
Option("--complexity", type="choice", choices=["on","off","default"],
help="The password complexity (on | off | default). Default is 'on'"),
Option("--store-plaintext", type="choice", choices=["on","off","default"],
help="Store plaintext passwords where account have 'store passwords with reversible encryption' set (on | off | default). Default is 'off'"),
Option("--history-length",
help="The password history length (<integer> | default). Default is 24.", type=str),
Option("--min-pwd-length",
help="The minimum password length (<integer> | default). Default is 7.", type=str),
Option("--min-pwd-age",
help="The minimum password age (<integer in days> | default). Default is 1.", type=str),
Option("--max-pwd-age",
help="The maximum password age (<integer in days> | default). Default is 43.", type=str),
]
takes_args = ["subcommand"]
def run(self, subcommand, H=None, min_pwd_age=None, max_pwd_age=None,
quiet=False, complexity=None, store_plaintext=None, history_length=None,
min_pwd_length=None, credopts=None, sambaopts=None,
versionopts=None):
lp = sambaopts.get_loadparm()
creds = credopts.get_credentials(lp)
samdb = SamDB(url=H, session_info=system_session(),
credentials=creds, lp=lp)
domain_dn = samdb.domain_dn()
res = samdb.search(domain_dn, scope=ldb.SCOPE_BASE,
attrs=["pwdProperties", "pwdHistoryLength", "minPwdLength",
"minPwdAge", "maxPwdAge"])
assert(len(res) == 1)
try:
pwd_props = int(res[0]["pwdProperties"][0])
pwd_hist_len = int(res[0]["pwdHistoryLength"][0])
cur_min_pwd_len = int(res[0]["minPwdLength"][0])
# ticks -> days
cur_min_pwd_age = int(abs(int(res[0]["minPwdAge"][0])) / (1e7 * 60 * 60 * 24))
cur_max_pwd_age = int(abs(int(res[0]["maxPwdAge"][0])) / (1e7 * 60 * 60 * 24))
except Exception, e:
raise CommandError("Could not retrieve password properties!", e)
if subcommand == "show":
self.message("Password informations for domain '%s'" % domain_dn)
self.message("")
if pwd_props & DOMAIN_PASSWORD_COMPLEX != 0:
self.message("Password complexity: on")
else:
self.message("Password complexity: off")
if pwd_props & DOMAIN_PASSWORD_STORE_CLEARTEXT != 0:
self.message("Store plaintext passwords: on")
else:
self.message("Store plaintext passwords: off")
self.message("Password history length: %d" % pwd_hist_len)
self.message("Minimum password length: %d" % cur_min_pwd_len)
self.message("Minimum password age (days): %d" % cur_min_pwd_age)
self.message("Maximum password age (days): %d" % cur_max_pwd_age)
elif subcommand == "set":
msgs = []
m = ldb.Message()
m.dn = ldb.Dn(samdb, domain_dn)
if complexity is not None:
if complexity == "on" or complexity == "default":
pwd_props = pwd_props | DOMAIN_PASSWORD_COMPLEX
msgs.append("Password complexity activated!")
elif complexity == "off":
pwd_props = pwd_props & (~DOMAIN_PASSWORD_COMPLEX)
msgs.append("Password complexity deactivated!")
if store_plaintext is not None:
if store_plaintext == "on" or store_plaintext == "default":
pwd_props = pwd_props | DOMAIN_PASSWORD_STORE_CLEARTEXT
msgs.append("Plaintext password storage for changed passwords activated!")
elif store_plaintext == "off":
pwd_props = pwd_props & (~DOMAIN_PASSWORD_STORE_CLEARTEXT)
msgs.append("Plaintext password storage for changed passwords deactivated!")
if complexity is not None or store_plaintext is not None:
m["pwdProperties"] = ldb.MessageElement(str(pwd_props),
ldb.FLAG_MOD_REPLACE, "pwdProperties")
if history_length is not None:
if history_length == "default":
pwd_hist_len = 24
else:
pwd_hist_len = int(history_length)
if pwd_hist_len < 0 or pwd_hist_len > 24:
raise CommandError("Password history length must be in the range of 0 to 24!")
m["pwdHistoryLength"] = ldb.MessageElement(str(pwd_hist_len),
ldb.FLAG_MOD_REPLACE, "pwdHistoryLength")
msgs.append("Password history length changed!")
if min_pwd_length is not None:
if min_pwd_length == "default":
min_pwd_len = 7
else:
min_pwd_len = int(min_pwd_length)
if min_pwd_len < 0 or min_pwd_len > 14:
raise CommandError("Minimum password length must be in the range of 0 to 14!")
m["minPwdLength"] = ldb.MessageElement(str(min_pwd_len),
ldb.FLAG_MOD_REPLACE, "minPwdLength")
msgs.append("Minimum password length changed!")
if min_pwd_age is not None:
if min_pwd_age == "default":
min_pwd_age = 1
else:
min_pwd_age = int(min_pwd_age)
if min_pwd_age < 0 or min_pwd_age > 998:
raise CommandError("Minimum password age must be in the range of 0 to 998!")
# days -> ticks
min_pwd_age_ticks = -int(min_pwd_age * (24 * 60 * 60 * 1e7))
m["minPwdAge"] = ldb.MessageElement(str(min_pwd_age_ticks),
ldb.FLAG_MOD_REPLACE, "minPwdAge")
msgs.append("Minimum password age changed!")
if max_pwd_age is not None:
if max_pwd_age == "default":
max_pwd_age = 43
else:
max_pwd_age = int(max_pwd_age)
if max_pwd_age < 0 or max_pwd_age > 999:
raise CommandError("Maximum password age must be in the range of 0 to 999!")
# days -> ticks
max_pwd_age_ticks = -int(max_pwd_age * (24 * 60 * 60 * 1e7))
m["maxPwdAge"] = ldb.MessageElement(str(max_pwd_age_ticks),
ldb.FLAG_MOD_REPLACE, "maxPwdAge")
msgs.append("Maximum password age changed!")
if max_pwd_age > 0 and min_pwd_age >= max_pwd_age:
raise CommandError("Maximum password age (%d) must be greater than minimum password age (%d)!" % (max_pwd_age, min_pwd_age))
samdb.modify(m)
msgs.append("All changes applied successfully!")
self.message("\n".join(msgs))
else:
raise CommandError("Wrong argument '%s'!" % subcommand)