s4/test: Added test for simple bind with machine account

Samba4 returns error on simple bind, when we do it using openldap
simple_bind_s api.

source4/auth/credentials/tests/bind.py

@@ -0,0 +1,116 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+# This is unit with tests for LDAP access checks
+
+import optparse
+import sys
+import base64
+import re
+import os
+
+sys.path.append("bin/python")
+import samba
+samba.ensure_external_module("subunit", "subunit/python")
+samba.ensure_external_module("testtools", "testtools")
+
+import samba.getopt as options
+
+from ldb import (
+    SCOPE_BASE, SCOPE_SUBTREE, LdbError, ERR_NO_SUCH_OBJECT)
+from samba.dcerpc import security
+
+from samba.auth import system_session
+from samba import gensec
+from samba.samdb import SamDB
+from samba.credentials import Credentials
+import samba.tests
+from subunit.run import SubunitTestRunner
+import unittest
+
+parser = optparse.OptionParser("ldap [options] <host>")
+sambaopts = options.SambaOptions(parser)
+parser.add_option_group(sambaopts)
+
+# use command line creds if available
+credopts = options.CredentialsOptions(parser)
+parser.add_option_group(credopts)
+opts, args = parser.parse_args()
+
+if len(args) < 1:
+    parser.print_usage()
+    sys.exit(1)
+
+host = args[0]
+lp = sambaopts.get_loadparm()
+creds = credopts.get_credentials(lp)
+creds.set_gensec_features(creds.get_gensec_features() | gensec.FEATURE_SEAL)
+creds_machine = creds
+
+class BindTests(samba.tests.TestCase):
+    def delete_force(self, ldb, dn):
+        try:
+            ldb.delete(dn)
+        except LdbError, (num, _):
+            self.assertEquals(num, ERR_NO_SUCH_OBJECT)
+
+    def find_basedn(self, ldb):
+        res = ldb.search(base="", expression="", scope=SCOPE_BASE,
+                         attrs=["defaultNamingContext"])
+        self.assertEquals(len(res), 1)
+        return res[0]["defaultNamingContext"][0]
+
+    def setUp(self):
+        super(BindTests, self).setUp()
+        self.base_dn = self.find_basedn(ldb)
+
+    def tearDown(self):
+        super(BindTests, self).tearDown()
+
+    def test_computer_account_bind(self):
+        # create a computer acocount for the test
+        self.user_dn = "CN=centos53,CN=Computers,%s" % self.base_dn
+        self.password = "P@ssw0rd"
+        self.acc_name = "centos53$"
+
+        self.delete_force(ldb, self.user_dn)
+        ldb.add_ldif("""
+dn: """ + self.user_dn + """
+cn: CENTOS53
+displayName: CENTOS53$
+name: CENTOS53
+sAMAccountName: CENTOS53$
+countryCode: 0
+objectClass: computer
+objectClass: organizationalPerson
+objectClass: person
+objectClass: top
+objectClass: user
+codePage: 0
+userAccountControl: 4096
+dNSHostName: centos53.alabala.test
+operatingSystemVersion: 5.2 (3790)
+operatingSystem: Windows Server 2003
+""")
+        ldb.modify_ldif("""
+dn: """ + self.user_dn + """
+changetype: modify
+replace: unicodePwd
+unicodePwd:: """ + base64.b64encode("\"P@ssw0rd\"".encode('utf-16-le')) + """
+""")
+
+        # do a simple bind and search with the machine account
+        creds_machine.set_bind_dn(self.user_dn)
+        creds_machine.set_password(self.password)
+        ldb_machine = SamDB(host, credentials=creds_machine, session_info=system_session(), lp=lp)
+        self.find_basedn(ldb_machine)
+
+if not "://" in host:
+    host = "ldap://%s" % host
+ldb = SamDB(host, credentials=creds, session_info=system_session(), lp=lp)
+
+runner = SubunitTestRunner()
+rc = 0
+if not runner.run(unittest.makeSuite(BindTests)).wasSuccessful():
+    rc = 1
+
+sys.exit(rc)