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-rwxr-xr-xsource4/dsdb/tests/python/sam.py451
1 files changed, 448 insertions, 3 deletions
diff --git a/source4/dsdb/tests/python/sam.py b/source4/dsdb/tests/python/sam.py
index fc5967cdd9..19706731bb 100755
--- a/source4/dsdb/tests/python/sam.py
+++ b/source4/dsdb/tests/python/sam.py
@@ -23,13 +23,13 @@ from ldb import ERR_NOT_ALLOWED_ON_NON_LEAF, ERR_OTHER, ERR_INVALID_DN_SYNTAX
from ldb import ERR_NO_SUCH_ATTRIBUTE
from ldb import ERR_OBJECT_CLASS_VIOLATION, ERR_NOT_ALLOWED_ON_RDN
from ldb import ERR_NAMING_VIOLATION, ERR_CONSTRAINT_VIOLATION
-from ldb import ERR_UNDEFINED_ATTRIBUTE_TYPE
+from ldb import ERR_UNDEFINED_ATTRIBUTE_TYPE, ERR_INSUFFICIENT_ACCESS_RIGHTS
from ldb import Message, MessageElement, Dn
from ldb import FLAG_MOD_ADD, FLAG_MOD_REPLACE, FLAG_MOD_DELETE
from samba import Ldb
from samba.dsdb import (UF_NORMAL_ACCOUNT, UF_INTERDOMAIN_TRUST_ACCOUNT,
UF_WORKSTATION_TRUST_ACCOUNT, UF_SERVER_TRUST_ACCOUNT,
- UF_PARTIAL_SECRETS_ACCOUNT,
+ UF_PARTIAL_SECRETS_ACCOUNT, UF_TEMP_DUPLICATE_ACCOUNT,
UF_PASSWD_NOTREQD, UF_ACCOUNTDISABLE, ATYPE_NORMAL_ACCOUNT,
GTYPE_SECURITY_BUILTIN_LOCAL_GROUP, GTYPE_SECURITY_DOMAIN_LOCAL_GROUP,
GTYPE_SECURITY_GLOBAL_GROUP, GTYPE_SECURITY_UNIVERSAL_GROUP,
@@ -96,6 +96,7 @@ class SamTests(unittest.TestCase):
print "baseDN: %s\n" % self.base_dn
self.delete_force(self.ldb, "cn=ldaptestuser,cn=users," + self.base_dn)
+ self.delete_force(self.ldb, "cn=ldaptestcomputer,cn=users," + self.base_dn)
self.delete_force(self.ldb, "cn=ldaptestgroup,cn=users," + self.base_dn)
self.delete_force(self.ldb, "cn=ldaptestuser2,cn=users," + self.base_dn)
@@ -571,7 +572,7 @@ class SamTests(unittest.TestCase):
self.assertFalse("objectClass" in res1[0])
self.assertTrue("canonicalName" in res1[0])
- res1 = ldb.search("cn=users,"+self.base_dn,
+ res1 = ldb.search("cn=users," + self.base_dn,
scope=SCOPE_BASE, attrs=["primaryGroupToken"])
self.assertTrue(len(res1) == 1)
self.assertFalse("primaryGroupToken" in res1[0])
@@ -1237,6 +1238,450 @@ class SamTests(unittest.TestCase):
self.delete_force(self.ldb, "cn=ldaptestgroup,cn=users," + self.base_dn)
+ def test_userAccountControl(self):
+ """Test the userAccountControl behaviour"""
+ print "Testing userAccountControl behaviour\n"
+
+ # With a user object
+
+ # Add operation
+
+ # As user you can only set a normal account.
+ # The UF_PASSWD_NOTREQD flag is needed since we haven't requested a
+ # password yet.
+ # With SYSTEM rights you can set a interdomain trust account.
+
+ # Invalid attribute
+ try:
+ ldb.add({
+ "dn": "cn=ldaptestuser,cn=users," + self.base_dn,
+ "objectclass": ["user", "person"],
+ "userAccountControl": "0"})
+ self.fail()
+ except LdbError, (num, _):
+ self.assertEquals(num, ERR_UNWILLING_TO_PERFORM)
+ self.delete_force(self.ldb, "cn=ldaptestuser,cn=users," + self.base_dn)
+
+# This has to wait until s4 supports it (needs a password module change)
+# try:
+# ldb.add({
+# "dn": "cn=ldaptestuser,cn=users," + self.base_dn,
+# "objectclass": ["user", "person"],
+# "userAccountControl": str(UF_NORMAL_ACCOUNT)})
+# self.fail()
+# except LdbError, (num, _):
+# self.assertEquals(num, ERR_UNWILLING_TO_PERFORM)
+# self.delete_force(self.ldb, "cn=ldaptestuser,cn=users," + self.base_dn)
+
+ ldb.add({
+ "dn": "cn=ldaptestuser,cn=users," + self.base_dn,
+ "objectclass": ["user", "person"],
+ "userAccountControl": str(UF_NORMAL_ACCOUNT | UF_PASSWD_NOTREQD)})
+
+ res1 = ldb.search("cn=ldaptestuser,cn=users," + self.base_dn,
+ scope=SCOPE_BASE, attrs=["sAMAccountType"])
+ self.assertTrue(len(res1) == 1)
+ self.assertEquals(int(res1[0]["sAMAccountType"][0]),
+ ATYPE_NORMAL_ACCOUNT)
+ self.delete_force(self.ldb, "cn=ldaptestuser,cn=users," + self.base_dn)
+
+ try:
+ ldb.add({
+ "dn": "cn=ldaptestuser,cn=users," + self.base_dn,
+ "objectclass": ["user", "person"],
+ "userAccountControl": str(UF_TEMP_DUPLICATE_ACCOUNT)})
+ self.fail()
+ except LdbError, (num, _):
+ self.assertEquals(num, ERR_OTHER)
+ self.delete_force(self.ldb, "cn=ldaptestuser,cn=users," + self.base_dn)
+
+# This isn't supported yet in s4
+# try:
+# ldb.add({
+# "dn": "cn=ldaptestuser,cn=users," + self.base_dn,
+# "objectclass": ["user", "person"],
+# "userAccountControl": str(UF_SERVER_TRUST_ACCOUNT)})
+# self.fail()
+# except LdbError, (num, _):
+# self.assertEquals(num, ERR_OBJECT_CLASS_VIOLATION)
+# self.delete_force(self.ldb, "cn=ldaptestuser,cn=users," + self.base_dn)
+#
+# try:
+# ldb.add({
+# "dn": "cn=ldaptestuser,cn=users," + self.base_dn,
+# "objectclass": ["user", "person"],
+# "userAccountControl": str(UF_WORKSTATION_TRUST_ACCOUNT)})
+# except LdbError, (num, _):
+# self.assertEquals(num, ERR_OBJECT_CLASS_VIOLATION)
+# self.delete_force(self.ldb, "cn=ldaptestuser,cn=users," + self.base_dn)
+
+# This isn't supported yet in s4 - needs ACL module adaption
+# try:
+# ldb.add({
+# "dn": "cn=ldaptestuser,cn=users," + self.base_dn,
+# "objectclass": ["user", "person"],
+# "userAccountControl": str(UF_INTERDOMAIN_TRUST_ACCOUNT)})
+# self.fail()
+# except LdbError, (num, _):
+# self.assertEquals(num, ERR_INSUFFICIENT_ACCESS_RIGHTS)
+# self.delete_force(self.ldb, "cn=ldaptestuser,cn=users," + self.base_dn)
+
+ # Modify operation
+
+ ldb.add({
+ "dn": "cn=ldaptestuser,cn=users," + self.base_dn,
+ "objectclass": ["user", "person"]})
+
+ # After creation we should have a normal account
+ res1 = ldb.search("cn=ldaptestuser,cn=users," + self.base_dn,
+ scope=SCOPE_BASE, attrs=["sAMAccountType"])
+ self.assertTrue(len(res1) == 1)
+ self.assertEquals(int(res1[0]["sAMAccountType"][0]),
+ ATYPE_NORMAL_ACCOUNT)
+
+ # As user you can only switch from a normal account to a workstation
+ # trust account and back.
+ # The UF_PASSWD_NOTREQD flag is needed since we haven't requested a
+ # password yet.
+ # With SYSTEM rights you can switch to a interdomain trust account.
+
+ # Invalid attribute
+ try:
+ m = Message()
+ m.dn = Dn(ldb, "cn=ldaptestuser,cn=users," + self.base_dn)
+ m["userAccountControl"] = MessageElement("0",
+ FLAG_MOD_REPLACE, "userAccountControl")
+ ldb.modify(m)
+ except LdbError, (num, _):
+ self.assertEquals(num, ERR_UNWILLING_TO_PERFORM)
+
+# This has to wait until s4 supports it (needs a password module change)
+# try:
+# m = Message()
+# m.dn = Dn(ldb, "cn=ldaptestuser,cn=users," + self.base_dn)
+# m["userAccountControl"] = MessageElement(
+# str(UF_NORMAL_ACCOUNT),
+# FLAG_MOD_REPLACE, "userAccountControl")
+# ldb.modify(m)
+# except LdbError, (num, _):
+# self.assertEquals(num, ERR_UNWILLING_TO_PERFORM)
+
+ m = Message()
+ m.dn = Dn(ldb, "cn=ldaptestuser,cn=users," + self.base_dn)
+ m["userAccountControl"] = MessageElement(
+ str(UF_NORMAL_ACCOUNT | UF_PASSWD_NOTREQD),
+ FLAG_MOD_REPLACE, "userAccountControl")
+ ldb.modify(m)
+
+ res1 = ldb.search("cn=ldaptestuser,cn=users," + self.base_dn,
+ scope=SCOPE_BASE, attrs=["sAMAccountType"])
+ self.assertTrue(len(res1) == 1)
+ self.assertEquals(int(res1[0]["sAMAccountType"][0]),
+ ATYPE_NORMAL_ACCOUNT)
+
+ try:
+ m = Message()
+ m.dn = Dn(ldb, "cn=ldaptestuser,cn=users," + self.base_dn)
+ m["userAccountControl"] = MessageElement(
+ str(UF_TEMP_DUPLICATE_ACCOUNT),
+ FLAG_MOD_REPLACE, "userAccountControl")
+ ldb.modify(m)
+ self.fail()
+ except LdbError, (num, _):
+ self.assertEquals(num, ERR_OTHER)
+
+# This isn't supported yet in s4
+# try:
+# m = Message()
+# m.dn = Dn(ldb, "cn=ldaptestuser,cn=users," + self.base_dn)
+# m["userAccountControl"] = MessageElement(
+# str(UF_SERVER_TRUST_ACCOUNT),
+# FLAG_MOD_REPLACE, "userAccountControl")
+# ldb.modify(m)
+# self.fail()
+# except LdbError, (num, _):
+# self.assertEquals(num, ERR_UNWILLING_TO_PERFORM)
+
+ m = Message()
+ m.dn = Dn(ldb, "cn=ldaptestuser,cn=users," + self.base_dn)
+ m["userAccountControl"] = MessageElement(
+ str(UF_WORKSTATION_TRUST_ACCOUNT),
+ FLAG_MOD_REPLACE, "userAccountControl")
+ ldb.modify(m)
+
+ res1 = ldb.search("cn=ldaptestuser,cn=users," + self.base_dn,
+ scope=SCOPE_BASE, attrs=["sAMAccountType"])
+ self.assertTrue(len(res1) == 1)
+ self.assertEquals(int(res1[0]["sAMAccountType"][0]),
+ ATYPE_WORKSTATION_TRUST)
+
+ m = Message()
+ m.dn = Dn(ldb, "cn=ldaptestuser,cn=users," + self.base_dn)
+ m["userAccountControl"] = MessageElement(
+ str(UF_NORMAL_ACCOUNT | UF_PASSWD_NOTREQD),
+ FLAG_MOD_REPLACE, "userAccountControl")
+ ldb.modify(m)
+
+ res1 = ldb.search("cn=ldaptestuser,cn=users," + self.base_dn,
+ scope=SCOPE_BASE, attrs=["sAMAccountType"])
+ self.assertTrue(len(res1) == 1)
+ self.assertEquals(int(res1[0]["sAMAccountType"][0]),
+ ATYPE_NORMAL_ACCOUNT)
+
+# This isn't supported yet in s4 - needs ACL module adaption
+# try:
+# m = Message()
+# m.dn = Dn(ldb, "cn=ldaptestuser,cn=users," + self.base_dn)
+# m["userAccountControl"] = MessageElement(
+# str(UF_INTERDOMAIN_TRUST_ACCOUNT),
+# FLAG_MOD_REPLACE, "userAccountControl")
+# ldb.modify(m)
+# self.fail()
+# except LdbError, (num, _):
+# self.assertEquals(num, ERR_INSUFFICIENT_ACCESS_RIGHTS)
+
+ # With a computer object
+
+ # Add operation
+
+ # As computer you can set a normal account and a server trust account.
+ # The UF_PASSWD_NOTREQD flag is needed since we haven't requested a
+ # password yet.
+ # With SYSTEM rights you can set a interdomain trust account.
+
+ # Invalid attribute
+ try:
+ ldb.add({
+ "dn": "cn=ldaptestcomputer,cn=computers," + self.base_dn,
+ "objectclass": ["computer"],
+ "userAccountControl": "0"})
+ self.fail()
+ except LdbError, (num, _):
+ self.assertEquals(num, ERR_UNWILLING_TO_PERFORM)
+ self.delete_force(self.ldb, "cn=ldaptestcomputer,cn=computers," + self.base_dn)
+
+# This has to wait until s4 supports it (needs a password module change)
+# try:
+# ldb.add({
+# "dn": "cn=ldaptestcomputer,cn=computers," + self.base_dn,
+# "objectclass": ["computer"],
+# "userAccountControl": str(UF_NORMAL_ACCOUNT)})
+# self.fail()
+# except LdbError, (num, _):
+# self.assertEquals(num, ERR_UNWILLING_TO_PERFORM)
+# self.delete_force(self.ldb, "cn=ldaptestcomputer,cn=computers," + self.base_dn)
+
+ ldb.add({
+ "dn": "cn=ldaptestcomputer,cn=computers," + self.base_dn,
+ "objectclass": ["computer"],
+ "userAccountControl": str(UF_NORMAL_ACCOUNT | UF_PASSWD_NOTREQD)})
+
+ res1 = ldb.search("cn=ldaptestcomputer,cn=computers," + self.base_dn,
+ scope=SCOPE_BASE, attrs=["sAMAccountType"])
+ self.assertTrue(len(res1) == 1)
+ self.assertEquals(int(res1[0]["sAMAccountType"][0]),
+ ATYPE_NORMAL_ACCOUNT)
+ self.delete_force(self.ldb, "cn=ldaptestcomputer,cn=computers," + self.base_dn)
+
+ try:
+ ldb.add({
+ "dn": "cn=ldaptestcomputer,cn=computers," + self.base_dn,
+ "objectclass": ["computer"],
+ "userAccountControl": str(UF_TEMP_DUPLICATE_ACCOUNT)})
+ self.fail()
+ except LdbError, (num, _):
+ self.assertEquals(num, ERR_OTHER)
+ self.delete_force(self.ldb, "cn=ldaptestcomputer,cn=computers," + self.base_dn)
+
+ ldb.add({
+ "dn": "cn=ldaptestcomputer,cn=computers," + self.base_dn,
+ "objectclass": ["computer"],
+ "userAccountControl": str(UF_SERVER_TRUST_ACCOUNT)})
+
+ res1 = ldb.search("cn=ldaptestcomputer,cn=computers," + self.base_dn,
+ scope=SCOPE_BASE, attrs=["sAMAccountType"])
+ self.assertTrue(len(res1) == 1)
+ self.assertEquals(int(res1[0]["sAMAccountType"][0]),
+ ATYPE_WORKSTATION_TRUST)
+ self.delete_force(self.ldb, "cn=ldaptestcomputer,cn=computers," + self.base_dn)
+
+ try:
+ ldb.add({
+ "dn": "cn=ldaptestcomputer,cn=computers," + self.base_dn,
+ "objectclass": ["computer"],
+ "userAccountControl": str(UF_WORKSTATION_TRUST_ACCOUNT)})
+ except LdbError, (num, _):
+ self.assertEquals(num, ERR_OBJECT_CLASS_VIOLATION)
+ self.delete_force(self.ldb, "cn=ldaptestcomputer,cn=computers," + self.base_dn)
+
+# This isn't supported yet in s4 - needs ACL module adaption
+# try:
+# ldb.add({
+# "dn": "cn=ldaptestcomputer,cn=computers," + self.base_dn,
+# "objectclass": ["computer"],
+# "userAccountControl": str(UF_INTERDOMAIN_TRUST_ACCOUNT)})
+# self.fail()
+# except LdbError, (num, _):
+# self.assertEquals(num, ERR_INSUFFICIENT_ACCESS_RIGHTS)
+# self.delete_force(self.ldb, "cn=ldaptestcomputer,cn=computers," + self.base_dn)
+
+ # Modify operation
+
+ ldb.add({
+ "dn": "cn=ldaptestcomputer,cn=computers," + self.base_dn,
+ "objectclass": ["computer"]})
+
+ # After creation we should have a normal account
+ res1 = ldb.search("cn=ldaptestcomputer,cn=computers," + self.base_dn,
+ scope=SCOPE_BASE, attrs=["sAMAccountType"])
+ self.assertTrue(len(res1) == 1)
+ self.assertEquals(int(res1[0]["sAMAccountType"][0]),
+ ATYPE_NORMAL_ACCOUNT)
+
+ # As computer you can switch from a normal account to a workstation
+ # or server trust account and back (also swapping between trust
+ # accounts is allowed).
+ # The UF_PASSWD_NOTREQD flag is needed since we haven't requested a
+ # password yet.
+ # With SYSTEM rights you can switch to a interdomain trust account.
+
+ # Invalid attribute
+ try:
+ m = Message()
+ m.dn = Dn(ldb, "cn=ldaptestcomputer,cn=computers," + self.base_dn)
+ m["userAccountControl"] = MessageElement("0",
+ FLAG_MOD_REPLACE, "userAccountControl")
+ ldb.modify(m)
+ except LdbError, (num, _):
+ self.assertEquals(num, ERR_UNWILLING_TO_PERFORM)
+
+# This has to wait until s4 supports it (needs a password module change)
+# try:
+# m = Message()
+# m.dn = Dn(ldb, "cn=ldaptestcomputer,cn=computers," + self.base_dn)
+# m["userAccountControl"] = MessageElement(
+# str(UF_NORMAL_ACCOUNT),
+# FLAG_MOD_REPLACE, "userAccountControl")
+# ldb.modify(m)
+# except LdbError, (num, _):
+# self.assertEquals(num, ERR_UNWILLING_TO_PERFORM)
+
+ m = Message()
+ m.dn = Dn(ldb, "cn=ldaptestcomputer,cn=computers," + self.base_dn)
+ m["userAccountControl"] = MessageElement(
+ str(UF_NORMAL_ACCOUNT | UF_PASSWD_NOTREQD),
+ FLAG_MOD_REPLACE, "userAccountControl")
+ ldb.modify(m)
+
+ res1 = ldb.search("cn=ldaptestcomputer,cn=computers," + self.base_dn,
+ scope=SCOPE_BASE, attrs=["sAMAccountType"])
+ self.assertTrue(len(res1) == 1)
+ self.assertEquals(int(res1[0]["sAMAccountType"][0]),
+ ATYPE_NORMAL_ACCOUNT)
+
+ try:
+ m = Message()
+ m.dn = Dn(ldb, "cn=ldaptestcomputer,cn=computers," + self.base_dn)
+ m["userAccountControl"] = MessageElement(
+ str(UF_TEMP_DUPLICATE_ACCOUNT),
+ FLAG_MOD_REPLACE, "userAccountControl")
+ ldb.modify(m)
+ self.fail()
+ except LdbError, (num, _):
+ self.assertEquals(num, ERR_OTHER)
+
+ m = Message()
+ m.dn = Dn(ldb, "cn=ldaptestcomputer,cn=computers," + self.base_dn)
+ m["userAccountControl"] = MessageElement(
+ str(UF_SERVER_TRUST_ACCOUNT),
+ FLAG_MOD_REPLACE, "userAccountControl")
+ ldb.modify(m)
+
+ res1 = ldb.search("cn=ldaptestcomputer,cn=computers," + self.base_dn,
+ scope=SCOPE_BASE, attrs=["sAMAccountType"])
+ self.assertTrue(len(res1) == 1)
+ self.assertEquals(int(res1[0]["sAMAccountType"][0]),
+ ATYPE_WORKSTATION_TRUST)
+
+ m = Message()
+ m.dn = Dn(ldb, "cn=ldaptestcomputer,cn=computers," + self.base_dn)
+ m["userAccountControl"] = MessageElement(
+ str(UF_NORMAL_ACCOUNT | UF_PASSWD_NOTREQD),
+ FLAG_MOD_REPLACE, "userAccountControl")
+ ldb.modify(m)
+
+ res1 = ldb.search("cn=ldaptestcomputer,cn=computers," + self.base_dn,
+ scope=SCOPE_BASE, attrs=["sAMAccountType"])
+ self.assertTrue(len(res1) == 1)
+ self.assertEquals(int(res1[0]["sAMAccountType"][0]),
+ ATYPE_NORMAL_ACCOUNT)
+
+ m = Message()
+ m.dn = Dn(ldb, "cn=ldaptestcomputer,cn=computers," + self.base_dn)
+ m["userAccountControl"] = MessageElement(
+ str(UF_WORKSTATION_TRUST_ACCOUNT),
+ FLAG_MOD_REPLACE, "userAccountControl")
+ ldb.modify(m)
+
+ res1 = ldb.search("cn=ldaptestcomputer,cn=computers," + self.base_dn,
+ scope=SCOPE_BASE, attrs=["sAMAccountType"])
+ self.assertTrue(len(res1) == 1)
+ self.assertEquals(int(res1[0]["sAMAccountType"][0]),
+ ATYPE_WORKSTATION_TRUST)
+
+ m = Message()
+ m.dn = Dn(ldb, "cn=ldaptestcomputer,cn=computers," + self.base_dn)
+ m["userAccountControl"] = MessageElement(
+ str(UF_NORMAL_ACCOUNT | UF_PASSWD_NOTREQD),
+ FLAG_MOD_REPLACE, "userAccountControl")
+ ldb.modify(m)
+
+ res1 = ldb.search("cn=ldaptestcomputer,cn=computers," + self.base_dn,
+ scope=SCOPE_BASE, attrs=["sAMAccountType"])
+ self.assertTrue(len(res1) == 1)
+ self.assertEquals(int(res1[0]["sAMAccountType"][0]),
+ ATYPE_NORMAL_ACCOUNT)
+
+ m = Message()
+ m.dn = Dn(ldb, "cn=ldaptestcomputer,cn=computers," + self.base_dn)
+ m["userAccountControl"] = MessageElement(
+ str(UF_SERVER_TRUST_ACCOUNT),
+ FLAG_MOD_REPLACE, "userAccountControl")
+ ldb.modify(m)
+
+ res1 = ldb.search("cn=ldaptestcomputer,cn=computers," + self.base_dn,
+ scope=SCOPE_BASE, attrs=["sAMAccountType"])
+ self.assertTrue(len(res1) == 1)
+ self.assertEquals(int(res1[0]["sAMAccountType"][0]),
+ ATYPE_WORKSTATION_TRUST)
+
+ m = Message()
+ m.dn = Dn(ldb, "cn=ldaptestcomputer,cn=computers," + self.base_dn)
+ m["userAccountControl"] = MessageElement(
+ str(UF_WORKSTATION_TRUST_ACCOUNT),
+ FLAG_MOD_REPLACE, "userAccountControl")
+ ldb.modify(m)
+
+ res1 = ldb.search("cn=ldaptestcomputer,cn=computers," + self.base_dn,
+ scope=SCOPE_BASE, attrs=["sAMAccountType"])
+ self.assertTrue(len(res1) == 1)
+ self.assertEquals(int(res1[0]["sAMAccountType"][0]),
+ ATYPE_WORKSTATION_TRUST)
+
+# This isn't supported yet in s4 - needs ACL module adaption
+# try:
+# m = Message()
+# m.dn = Dn(ldb, "cn=ldaptestcomputer,cn=computers," + self.base_dn)
+# m["userAccountControl"] = MessageElement(
+# str(UF_INTERDOMAIN_TRUST_ACCOUNT),
+# FLAG_MOD_REPLACE, "userAccountControl")
+# ldb.modify(m)
+# self.fail()
+# except LdbError, (num, _):
+# self.assertEquals(num, ERR_INSUFFICIENT_ACCESS_RIGHTS)
+
+ self.delete_force(self.ldb, "cn=ldaptestuser,cn=users," + self.base_dn)
+ self.delete_force(self.ldb, "cn=ldaptestcomputer,cn=computers," + self.base_dn)
if not "://" in host:
if os.path.isfile(host):