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audit_log_base.py
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audit_log_dsdb.py
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auth_log.py
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auth_log_ncalrpc.py
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dckeytab.py
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dns.py
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dns_aging.py
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dns_base.py
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dns_forwarder.py
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dns_invalid.py
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dns_packet.py
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dns_tkey.py
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dns_wildcard.py
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domain_backup.py
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dsdb.py
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dsdb_dns.py
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get_opt.py
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ldap_raw.py
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ldap_spn.py
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ldap_upn_sam_account.py
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libsmb.py
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loadparm.py
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lsa_string.py
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messaging.py
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ndr.py
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net_join.py
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net_join_no_spnego.py
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netbios.py
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netcmd.py
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netlogonsvc.py
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ntlmdisabled.py
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password_hash.py
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pso.py
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registry.py
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s3windb.py
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samba3sam.py
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samba_upgradedns_lmdb.py
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samdb.py
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security.py
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source.py
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strings.py
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Code Editor : dns_packet.py
# Tests of malformed DNS packets # Copyright (C) Catalyst.NET ltd # # written by Douglas Bagnall <douglas.bagnall@catalyst.net.nz> # # 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/>. """Sanity tests for DNS and NBT server parsing. We don't use a proper client library so we can make improper packets. """ import os import struct import socket import select from samba.dcerpc import dns, nbt from samba.tests import TestCase def _msg_id(): while True: for i in range(1, 0xffff): yield i SERVER = os.environ['SERVER_IP'] SERVER_NAME = f"{os.environ['SERVER']}.{os.environ['REALM']}" TIMEOUT = 0.5 def encode_netbios_bytes(chars): """Even RFC 1002 uses distancing quotes when calling this "compression".""" out = [] chars = (chars + b' ')[:16] for c in chars: out.append((c >> 4) + 65) out.append((c & 15) + 65) return bytes(out) class TestDnsPacketBase(TestCase): msg_id = _msg_id() def tearDown(self): # we need to ensure the DNS server is responsive before # continuing. for i in range(40): ok = self._known_good_query() if ok: return print(f"the server is STILL unresponsive after {40 * TIMEOUT} seconds") def decode_reply(self, data): header = data[:12] id, flags, n_q, n_a, n_rec, n_exta = struct.unpack('!6H', header) return { 'rcode': flags & 0xf } def construct_query(self, names): """Create a query packet containing one query record. *names* is either a single string name in the usual dotted form, or a list of names. In the latter case, each name can be a dotted string or a list of byte components, which allows dots in components. Where I say list, I mean non-string iterable. Examples: # these 3 are all the same "example.com" ["example.com"] [[b"example", b"com"]] # this is three names in the same request ["example.com", [b"example", b"com", b"..!"], (b"first component", b" 2nd component")] """ header = struct.pack('!6H', next(self.msg_id), 0x0100, # query, with recursion len(names), # number of queries 0x0000, # no answers 0x0000, # no records 0x0000, # no extra records ) tail = struct.pack('!BHH', 0x00, # root node self.qtype, 0x0001, # class IN-ternet ) encoded_bits = [] for name in names: if isinstance(name, str): bits = name.encode('utf8').split(b'.') else: bits = name for b in bits: encoded_bits.append(b'%c%s' % (len(b), b)) encoded_bits.append(tail) return header + b''.join(encoded_bits) def _test_query(self, names=(), expected_rcode=None): if isinstance(names, str): names = [names] packet = self.construct_query(names) s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) s.sendto(packet, self.server) r, _, _ = select.select([s], [], [], TIMEOUT) s.close() # It is reasonable to not reply to these packets (Windows # doesn't), but it is not reasonable to render the server # unresponsive. if r != [s]: ok = self._known_good_query() self.assertTrue(ok, f"the server is unresponsive") def _known_good_query(self): if self.server[1] == 53: name = SERVER_NAME expected_rcode = dns.DNS_RCODE_OK else: name = [encode_netbios_bytes(b'nxdomain'), b'nxdomain'] expected_rcode = nbt.NBT_RCODE_NAM packet = self.construct_query([name]) s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) s.sendto(packet, self.server) r, _, _ = select.select([s], [], [], TIMEOUT) if r != [s]: s.close() return False data, addr = s.recvfrom(4096) s.close() rcode = self.decode_reply(data)['rcode'] return expected_rcode == rcode def _test_empty_packet(self): packet = b"" s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) s.sendto(packet, self.server) s.close() # It is reasonable not to reply to an empty packet # but it is not reasonable to render the server # unresponsive. ok = self._known_good_query() self.assertTrue(ok, f"the server is unresponsive") class TestDnsPackets(TestDnsPacketBase): server = (SERVER, 53) qtype = 1 # dns type A def _test_many_repeated_components(self, label, n, expected_rcode=None): name = [label] * n self._test_query([name], expected_rcode=expected_rcode) def test_127_very_dotty_components(self): label = b'.' * 63 self._test_many_repeated_components(label, 127) def test_127_half_dotty_components(self): label = b'x.' * 31 + b'x' self._test_many_repeated_components(label, 127) def test_empty_packet(self): self._test_empty_packet() class TestNbtPackets(TestDnsPacketBase): server = (SERVER, 137) qtype = 0x20 # NBT_QTYPE_NETBIOS def _test_nbt_encode_query(self, names, *args, **kwargs): if isinstance(names, str): names = [names] nbt_names = [] for name in names: if isinstance(name, str): bits = name.encode('utf8').split(b'.') else: bits = name encoded = [encode_netbios_bytes(bits[0])] encoded.extend(bits[1:]) nbt_names.append(encoded) self._test_query(nbt_names, *args, **kwargs) def _test_many_repeated_components(self, label, n, expected_rcode=None): name = [label] * n name[0] = encode_netbios_bytes(label) self._test_query([name], expected_rcode=expected_rcode) def test_127_very_dotty_components(self): label = b'.' * 63 self._test_many_repeated_components(label, 127) def test_127_half_dotty_components(self): label = b'x.' * 31 + b'x' self._test_many_repeated_components(label, 127) def test_empty_packet(self): self._test_empty_packet()
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