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samba-mirror/python/samba/tests/pso.py
Douglas Bagnall 198bcfbac3 python tests: fix format() strings for Python 2.6
Python 2.6 wants "{0}".format(x), not "{}".format(x).

Signed-off-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
2018-09-21 20:04:23 +02:00

273 lines
11 KiB
Python

#
# Helper classes for testing Password Settings Objects.
#
# This also tests the default password complexity (i.e. pwdProperties),
# minPwdLength, pwdHistoryLength settings as a side-effect.
#
# Copyright (C) Andrew Bartlett <abartlet@samba.org> 2018
#
# 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 ldb
from ldb import FLAG_MOD_DELETE, FLAG_MOD_ADD, FLAG_MOD_REPLACE
from samba.dcerpc.samr import (DOMAIN_PASSWORD_COMPLEX,
DOMAIN_PASSWORD_STORE_CLEARTEXT)
class TestUser:
def __init__(self, username, samdb, userou=None):
initial_password = "Initial12#"
self.name = username
self.ldb = samdb
self.dn = "CN=%s,%s,%s" % (username, (userou or "CN=Users"),
self.ldb.domain_dn())
# store all passwords that have ever been used for this user, as well
# as a pwd_history that more closely resembles the history on the DC
self.all_old_passwords = [initial_password]
self.pwd_history = [initial_password]
self.ldb.newuser(username, initial_password, userou=userou)
self.ldb.enable_account("(sAMAccountName=%s)" % username)
self.last_pso = None
def old_invalid_passwords(self, hist_len):
"""Returns the expected password history for the DC"""
if hist_len == 0:
return []
# return the last n items in the list
return self.pwd_history[-hist_len:]
def old_valid_passwords(self, hist_len):
"""Returns old passwords that fall outside the DC's expected history"""
# if PasswordHistoryLength is zero, any previous password can be valid
if hist_len == 0:
return self.all_old_passwords[:]
# just exclude our pwd_history if there's not much in it. This can
# happen if we've been using a lower PasswordHistoryLength setting
# previously
hist_len = min(len(self.pwd_history), hist_len)
# return any passwords up to the nth-from-last item
return self.all_old_passwords[:-hist_len]
def update_pwd_history(self, new_password):
"""Updates the user's password history to reflect a password change"""
# we maintain 2 lists: all passwords the user has ever had, and an
# effective password-history that should roughly mirror the DC.
# pwd_history_change() handles the corner-case where we need to
# truncate password-history due to PasswordHistoryLength settings
# changes
if new_password in self.all_old_passwords:
self.all_old_passwords.remove(new_password)
self.all_old_passwords.append(new_password)
if new_password in self.pwd_history:
self.pwd_history.remove(new_password)
self.pwd_history.append(new_password)
def get_resultant_PSO(self):
"""Returns the DN of the applicable PSO, or None if none applies"""
res = self.ldb.search(self.dn, attrs=['msDS-ResultantPSO'])
if 'msDS-ResultantPSO' in res[0]:
return str(res[0]['msDS-ResultantPSO'][0])
else:
return None
def get_password(self):
"""Returns the user's current password"""
# current password in the last item in the list
return self.all_old_passwords[-1]
def set_password(self, new_password):
"""Attempts to change a user's password"""
ldif = """
dn: %s
changetype: modify
delete: userPassword
userPassword: %s
add: userPassword
userPassword: %s
""" % (self.dn, self.get_password(), new_password)
# this modify will throw an exception if new_password doesn't meet the
# PSO constraints (which the test code catches if it's expected to
# fail)
self.ldb.modify_ldif(ldif)
self.update_pwd_history(new_password)
def pwd_history_change(self, old_hist_len, new_hist_len):
"""
Updates the effective password history, to reflect changes on the DC.
When the PasswordHistoryLength applied to a user changes from a low
setting (e.g. 2) to a higher setting (e.g. 4), passwords #3 and #4
won't actually have been stored on the DC, so we need to make sure they
are removed them from our mirror pwd_history list.
"""
# our list may have been tracking more passwords than the DC actually
# stores. Truncate the list now to match what the DC currently has
hist_len = min(new_hist_len, old_hist_len)
if hist_len == 0:
self.pwd_history = []
elif hist_len < len(self.pwd_history):
self.pwd_history = self.pwd_history[-hist_len:]
# corner-case where history-length goes from zero to non-zero. Windows
# counts the current password as being in the history even before it
# changes (Samba only counts it from the next change onwards). We don't
# exercise this in the PSO tests due to this discrepancy, but the
# following check will support the Windows behaviour
if old_hist_len == 0 and new_hist_len > 0:
self.pwd_history = [self.get_password()]
def set_primary_group(self, group_dn):
"""Sets a user's primaryGroupID to be that of the specified group"""
# get the primaryGroupToken of the group
res = self.ldb.search(base=group_dn, attrs=["primaryGroupToken"],
scope=ldb.SCOPE_BASE)
group_id = res[0]["primaryGroupToken"]
# set primaryGroupID attribute of the user to that group
m = ldb.Message()
m.dn = ldb.Dn(self.ldb, self.dn)
m["primaryGroupID"] = ldb.MessageElement(group_id, FLAG_MOD_REPLACE,
"primaryGroupID")
self.ldb.modify(m)
class PasswordSettings:
def default_settings(self, samdb):
"""
Returns a object representing the default password settings that will
take effect (i.e. when no other Fine-Grained Password Policy applies)
"""
pw_attrs = ["minPwdAge", "lockoutDuration", "lockOutObservationWindow",
"lockoutThreshold", "maxPwdAge", "minPwdAge",
"minPwdLength", "pwdHistoryLength", "pwdProperties"]
res = samdb.search(samdb.domain_dn(), scope=ldb.SCOPE_BASE,
attrs=pw_attrs)
self.name = "Defaults"
self.dn = None
self.ldb = samdb
self.precedence = 0
self.complexity = \
int(res[0]["pwdProperties"][0]) & DOMAIN_PASSWORD_COMPLEX
self.store_plaintext = \
int(res[0]["pwdProperties"][0]) & DOMAIN_PASSWORD_STORE_CLEARTEXT
self.password_len = int(res[0]["minPwdLength"][0])
self.lockout_attempts = int(res[0]["lockoutThreshold"][0])
self.history_len = int(res[0]["pwdHistoryLength"][0])
# convert to time in secs
self.lockout_duration = int(res[0]["lockoutDuration"][0]) / -int(1e7)
self.lockout_window =\
int(res[0]["lockOutObservationWindow"][0]) / -int(1e7)
self.password_age_min = int(res[0]["minPwdAge"][0]) / -int(1e7)
self.password_age_max = int(res[0]["maxPwdAge"][0]) / -int(1e7)
def __init__(self, name, samdb, precedence=10, complexity=True,
password_len=10, lockout_attempts=0, lockout_duration=5,
password_age_min=0, password_age_max=60 * 60 * 24 * 30,
history_len=2, store_plaintext=False, container=None):
# if no PSO was specified, return an object representing the global
# password settings (i.e. the default settings, if no PSO trumps them)
if name is None:
return self.default_settings(samdb)
# only PSOs in the Password Settings Container are considered. You can
# create PSOs outside of this container, but it's not recommended
if container is None:
base_dn = samdb.domain_dn()
container = "CN=Password Settings Container,CN=System,%s" % base_dn
self.name = name
self.dn = "CN=%s,%s" % (name, container)
self.ldb = samdb
self.precedence = precedence
self.complexity = complexity
self.store_plaintext = store_plaintext
self.password_len = password_len
self.lockout_attempts = lockout_attempts
self.history_len = history_len
# times in secs
self.lockout_duration = lockout_duration
# lockout observation-window must be <= lockout-duration (the existing
# lockout tests just use the same value for both settings)
self.lockout_window = lockout_duration
self.password_age_min = password_age_min
self.password_age_max = password_age_max
# add the PSO to the DB
self.ldb.add_ldif(self.get_ldif())
def get_ldif(self):
complexity_str = "TRUE" if self.complexity else "FALSE"
plaintext_str = "TRUE" if self.store_plaintext else "FALSE"
# timestamps here are in units of -100 nano-seconds
lockout_duration = -int(self.lockout_duration * (1e7))
lockout_window = -int(self.lockout_window * (1e7))
min_age = -int(self.password_age_min * (1e7))
max_age = -int(self.password_age_max * (1e7))
# all the following fields are mandatory for the PSO object
ldif = """
dn: {0}
objectClass: msDS-PasswordSettings
msDS-PasswordSettingsPrecedence: {1}
msDS-PasswordReversibleEncryptionEnabled: {2}
msDS-PasswordHistoryLength: {3}
msDS-PasswordComplexityEnabled: {4}
msDS-MinimumPasswordLength: {5}
msDS-MinimumPasswordAge: {6}
msDS-MaximumPasswordAge: {7}
msDS-LockoutThreshold: {8}
msDS-LockoutObservationWindow: {9}
msDS-LockoutDuration: {10}
""".format(self.dn, self.precedence, plaintext_str, self.history_len,
complexity_str, self.password_len, min_age, max_age,
self.lockout_attempts, lockout_window, lockout_duration)
return ldif
def apply_to(self, user_group, operation=FLAG_MOD_ADD):
"""Updates this Password Settings Object to apply to a user or group"""
m = ldb.Message()
m.dn = ldb.Dn(self.ldb, self.dn)
m["msDS-PSOAppliesTo"] = ldb.MessageElement(user_group, operation,
"msDS-PSOAppliesTo")
self.ldb.modify(m)
def unapply(self, user_group):
"""Updates this PSO to no longer apply to a user or group"""
# just delete the msDS-PSOAppliesTo attribute (instead of adding it)
self.apply_to(user_group, operation=FLAG_MOD_DELETE)
def set_precedence(self, new_precedence, samdb=None):
if samdb is None:
samdb = self.ldb
ldif = """
dn: %s
changetype: modify
replace: msDS-PasswordSettingsPrecedence
msDS-PasswordSettingsPrecedence: %u
""" % (self.dn, new_precedence)
samdb.modify_ldif(ldif)
self.precedence = new_precedence