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# Unix SMB/CIFS implementation.
#
# Copyright © 2020 Andreas Schneider <asn@samba.org>
#
# 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/>.
#
"""Tests for samba.dcerpc.samr.password"""
import ctypes
import samba.tests
from samba import crypto, generate_random_password, generate_random_bytes, ntstatus
from samba.auth import system_session
from samba.credentials import Credentials
from samba.credentials import SMB_ENCRYPTION_REQUIRED
from samba.dcerpc import samr, security, lsa
from samba.samdb import SamDB
from samba.tests import RpcInterfaceTestCase
class SamrPasswordTests(RpcInterfaceTestCase):
def setUp(self):
super().setUp()
self.open_samdb()
self.create_user_account(10000)
self.remote_server = samba.tests.env_get_var_value('SERVER')
self.remote_domain = samba.tests.env_get_var_value('DOMAIN')
self.remote_user = samba.tests.env_get_var_value('USERNAME')
self.remote_password = samba.tests.env_get_var_value('PASSWORD')
self.remote_binding_string = "ncacn_np:%s[krb5]" % (self.remote_server)
self.remote_creds = Credentials()
self.remote_creds.guess(self.lp)
self.remote_creds.set_username(self.remote_user)
self.remote_creds.set_password(self.remote_password)
def tearDown(self):
super().tearDown()
samr.Close(self.user_handle)
samr.Close(self.domain_handle)
samr.Close(self.handle)
samba.tests.delete_force(self.samdb, self.user_dn)
#
# Open the samba database
#
def open_samdb(self):
self.lp = samba.tests.env_loadparm()
self.local_creds = Credentials()
self.local_creds.guess(self.lp)
self.session = system_session()
self.samdb = SamDB(session_info=self.session,
credentials=self.local_creds,
lp=self.lp)
#
# Open a SAMR Domain handle
#
def open_domain_handle(self):
self.handle = self.conn.Connect2(None,
security.SEC_FLAG_MAXIMUM_ALLOWED)
self.domain_sid = self.conn.LookupDomain(self.handle,
lsa.String(self.remote_domain))
self.domain_handle = self.conn.OpenDomain(self.handle,
security.SEC_FLAG_MAXIMUM_ALLOWED,
self.domain_sid)
def open_user_handle(self):
name = lsa.String(self.user_name)
rids = self.conn.LookupNames(self.domain_handle, [name])
self.user_handle = self.conn.OpenUser(self.domain_handle,
security.SEC_FLAG_MAXIMUM_ALLOWED,
rids[0].ids[0])
#
# Create a test user account
#
def create_user_account(self, user_id):
self.user_name = ("SAMR_USER_%d" % user_id)
self.user_pass = generate_random_password(32, 32)
self.user_dn = "cn=%s,cn=users,%s" % (self.user_name, self.samdb.domain_dn())
samba.tests.delete_force(self.samdb, self.user_dn)
self.samdb.newuser(self.user_name,
self.user_pass,
description="Password for " + self.user_name + " is " + self.user_pass,
givenname=self.user_name,
surname=self.user_name)
def init_samr_CryptPassword(self, password, session_key):
def encode_pw_buffer(password):
data = bytearray([0] * 516)
p = samba.string_to_byte_array(password.encode('utf-16-le'))
plen = len(p)
b = generate_random_bytes(512 - plen)
i = 512 - plen
data[0:i] = b
data[i:i+plen] = p
data[512:516] = plen.to_bytes(4, byteorder='little')
return bytes(data)
# This is a test, so always allow to encrypt using RC4
try:
crypto.set_relax_mode()
encrypted_blob = samba.arcfour_encrypt(session_key, encode_pw_buffer(password))
finally:
crypto.set_strict_mode()
out_blob = samr.CryptPassword()
out_blob.data = list(encrypted_blob)
return out_blob
def test_setUserInfo2_Password(self, password='P@ssw0rd'):
self.conn = samr.samr(self.remote_binding_string,
self.get_loadparm(),
self.remote_creds)
self.open_domain_handle()
self.open_user_handle()
password='P@ssw0rd'
level = 24
info = samr.UserInfo24()
info.password_expired = 0
info.password = self.init_samr_CryptPassword(password, self.conn.session_key)
# If the server is in FIPS mode, it should reject the password change!
try:
self.conn.SetUserInfo2(self.user_handle, level, info)
except samba.NTSTATUSError as e:
code = ctypes.c_uint32(e.args[0]).value
print(code)
if ((code == ntstatus.NT_STATUS_ACCESS_DENIED) and
(self.lp.weak_crypto == 'disallowed')):
pass
else:
raise
def test_setUserInfo2_Password_Encrypted(self, password='P@ssw0rd'):
self.remote_creds.set_smb_encryption(SMB_ENCRYPTION_REQUIRED)
self.conn = samr.samr(self.remote_binding_string,
self.get_loadparm(),
self.remote_creds)
self.open_domain_handle()
self.open_user_handle()
password='P@ssw0rd'
level = 24
info = samr.UserInfo24()
info.password_expired = 0
info.password = self.init_samr_CryptPassword(password, self.conn.session_key)
self.conn.SetUserInfo2(self.user_handle, level, info)
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