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#!/usr/bin/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
#
# 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 sys
# Find right directory when running from source tree
sys.path.insert(0, "bin/python")
import samba.getopt as options
import optparse
import ldb
from samba.auth import system_session
from samba.samdb import SamDB
from samba.dcerpc.samr import DOMAIN_PASSWORD_COMPLEX
parser = optparse.OptionParser("pwsettings (show | set <options>)")
sambaopts = options.SambaOptions(parser)
parser.add_option_group(sambaopts)
parser.add_option_group(options.VersionOptions(parser))
credopts = options.CredentialsOptions(parser)
parser.add_option_group(credopts)
parser.add_option("-H", help="LDB URL for database or target server", type=str)
parser.add_option("--quiet", help="Be quiet", action="store_true")
parser.add_option("--complexity",
help="The password complexity (on | off | default). Default is 'on'", type=str)
parser.add_option("--history-length",
help="The password history length (<integer> | default). Default is 24.", type=str)
parser.add_option("--min-pwd-length",
help="The minimum password length (<integer> | default). Default is 7.", type=str)
parser.add_option("--min-pwd-age",
help="The minimum password age (<integer in days> | default). Default is 0.", type=str)
parser.add_option("--max-pwd-age",
help="The maximum password age (<integer in days> | default). Default is 43.", type=str)
opts, args = parser.parse_args()
#
# print a message if quiet is not set
#
def message(text):
if not opts.quiet:
print text
if len(args) == 0:
parser.print_usage()
sys.exit(1)
lp = sambaopts.get_loadparm()
creds = credopts.get_credentials(lp)
if opts.H is not None:
url = opts.H
else:
url = lp.get("sam database")
samdb = SamDB(url=url, session_info=system_session(), credentials=creds, lp=lp)
domain_dn = SamDB.domain_dn(samdb)
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])
min_pwd_len = int(res[0]["minPwdLength"][0])
# ticks -> days
min_pwd_age = int(abs(int(res[0]["minPwdAge"][0])) / (1e7 * 60 * 60 * 24))
max_pwd_age = int(abs(int(res[0]["maxPwdAge"][0])) / (1e7 * 60 * 60 * 24))
except:
print "ERROR: Could not retrieve password properties!"
if args[0] == "show":
print "So no settings can be displayed!"
sys.exit(1)
if args[0] == "show":
message("Password informations for domain '" + domain_dn + "'")
message("")
if pwd_props & DOMAIN_PASSWORD_COMPLEX != 0:
message("Password complexity: on")
else:
message("Password complexity: off")
message("Password history length: " + str(pwd_hist_len))
message("Minimum password length: " + str(min_pwd_len))
message("Minimum password age (days): " + str(min_pwd_age))
message("Maximum password age (days): " + str(max_pwd_age))
elif args[0] == "set":
msgs = []
m = ldb.Message()
m.dn = ldb.Dn(samdb, domain_dn)
if opts.complexity is not None:
if opts.complexity == "on" or opts.complexity == "default":
pwd_props = pwd_props | DOMAIN_PASSWORD_COMPLEX
msgs.append("Password complexity activated!")
elif opts.complexity == "off":
pwd_props = pwd_props & (~DOMAIN_PASSWORD_COMPLEX)
msgs.append("Password complexity deactivated!")
else:
print "ERROR: Wrong argument '" + opts.complexity + "'!"
sys.exit(1)
m["pwdProperties"] = ldb.MessageElement(str(pwd_props),
ldb.FLAG_MOD_REPLACE, "pwdProperties")
if opts.history_length is not None:
if opts.history_length == "default":
pwd_hist_len = 24
else:
pwd_hist_len = int(opts.history_length)
if pwd_hist_len < 0 or pwd_hist_len > 24:
print "ERROR: Password history length must be in the range of 0 to 24!"
sys.exit(1)
m["pwdHistoryLength"] = ldb.MessageElement(str(pwd_hist_len),
ldb.FLAG_MOD_REPLACE, "pwdHistoryLength")
msgs.append("Password history length changed!")
if opts.min_pwd_length is not None:
if opts.min_pwd_length == "default":
min_pwd_len = 7
else:
min_pwd_len = int(opts.min_pwd_length)
if min_pwd_len < 0 or min_pwd_len > 14:
print "ERROR: Minimum password length must be in the range of 0 to 14!"
sys.exit(1)
m["minPwdLength"] = ldb.MessageElement(str(min_pwd_len),
ldb.FLAG_MOD_REPLACE, "minPwdLength")
msgs.append("Minimum password length changed!")
if opts.min_pwd_age is not None:
if opts.min_pwd_age == "default":
min_pwd_age = 0
else:
min_pwd_age = int(opts.min_pwd_age)
if min_pwd_age < 0 or min_pwd_age > 998:
print "ERROR: Minimum password age must be in the range of 0 to 998!"
sys.exit(1)
# 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 opts.max_pwd_age is not None:
if opts.max_pwd_age == "default":
max_pwd_age = 43
else:
max_pwd_age = int(opts.max_pwd_age)
if max_pwd_age < 0 or max_pwd_age > 999:
print "ERROR: Maximum password age must be in the range of 0 to 999!"
sys.exit(1)
# 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:
print "ERROR: Maximum password age (%d) must be greater than minimum password age (%d)!" % (max_pwd_age, min_pwd_age)
sys.exit(1)
samdb.modify(m)
msgs.append("All changes applied successfully!")
message("\n".join(msgs))
else:
print "ERROR: Wrong argument '" + args[0] + "'!"
sys.exit(1)
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