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selftest: add test for DNS updates with TKEY/TSIG
Bug: https://bugzilla.samba.org/show_bug.cgi?id=11520 Signed-off-by: Ralph Boehme <slow@samba.org> Reviewed-by: Garming Sam <garming@catalyst.net.nz> Autobuild-User(master): Garming Sam <garming@samba.org> Autobuild-Date(master): Thu Jun 16 04:07:41 CEST 2016 on sn-devel-144
This commit is contained in:
Ralph Boehme
Garming Sam
parent
88700e7d89
commit
721b21bb80
487
python/samba/tests/dns_tkey.py
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487
python/samba/tests/dns_tkey.py
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@ -0,0 +1,487 @@
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# Unix SMB/CIFS implementation.
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# Copyright (C) Kai Blin <kai@samba.org> 2011
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# Copyright (C) Ralph Boehme <slow@samba.org> 2016
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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import sys
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import struct
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import random
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import socket
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import optparse
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import uuid
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import time
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import samba.ndr as ndr
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import samba.getopt as options
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from samba import credentials
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from samba.dcerpc import dns, dnsp
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from samba.tests.subunitrun import SubunitOptions, TestProgram
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from samba import gensec, tests
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parser = optparse.OptionParser("dns.py <server name> <server ip> [options]")
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sambaopts = options.SambaOptions(parser)
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parser.add_option_group(sambaopts)
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# This timeout only has relevance when testing against Windows
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# Format errors tend to return patchy responses, so a timeout is needed.
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parser.add_option("--timeout", type="int", dest="timeout",
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help="Specify timeout for DNS requests")
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# use command line creds if available
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credopts = options.CredentialsOptions(parser)
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parser.add_option_group(credopts)
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subunitopts = SubunitOptions(parser)
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parser.add_option_group(subunitopts)
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opts, args = parser.parse_args()
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timeout = opts.timeout
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if len(args) < 2:
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parser.print_usage()
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sys.exit(1)
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server_name = args[0]
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server_ip = args[1]
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class DNSTest(tests.TestCase):
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def setUp(self):
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super(DNSTest, self).setUp()
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self.server = server_name
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self.server_ip = server_ip
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self.settings = {}
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self.settings["lp_ctx"] = self.lp_ctx = tests.env_loadparm()
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self.settings["target_hostname"] = self.server
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self.creds = credentials.Credentials()
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self.creds.guess(self.lp_ctx)
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self.creds.set_username(tests.env_get_var_value('USERNAME'))
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self.creds.set_password(tests.env_get_var_value('PASSWORD'))
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self.creds.set_kerberos_state(credentials.MUST_USE_KERBEROS)
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self.newrecname = "tkeytsig.%s" % self.get_dns_domain()
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def errstr(self, errcode):
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"Return a readable error code"
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string_codes = [
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"OK",
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"FORMERR",
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"SERVFAIL",
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"NXDOMAIN",
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"NOTIMP",
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"REFUSED",
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"YXDOMAIN",
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"YXRRSET",
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"NXRRSET",
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"NOTAUTH",
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"NOTZONE",
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"0x0B",
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"0x0C",
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"0x0D",
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"0x0E",
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"0x0F",
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"BADSIG",
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"BADKEY"
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]
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return string_codes[errcode]
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def assert_rcode_equals(self, rcode, expected):
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"Helper function to check return code"
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self.assertEquals(rcode, expected, "Expected RCODE %s, got %s" %
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(self.errstr(expected), self.errstr(rcode)))
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def assert_dns_rcode_equals(self, packet, rcode):
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"Helper function to check return code"
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p_errcode = packet.operation & 0x000F
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self.assertEquals(p_errcode, rcode, "Expected RCODE %s, got %s" %
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(self.errstr(rcode), self.errstr(p_errcode)))
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def assert_dns_opcode_equals(self, packet, opcode):
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"Helper function to check opcode"
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p_opcode = packet.operation & 0x7800
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self.assertEquals(p_opcode, opcode, "Expected OPCODE %s, got %s" %
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(opcode, p_opcode))
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def make_name_packet(self, opcode, qid=None):
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"Helper creating a dns.name_packet"
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p = dns.name_packet()
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if qid is None:
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p.id = random.randint(0x0, 0xff00)
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p.operation = opcode
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p.questions = []
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p.additional = []
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return p
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def finish_name_packet(self, packet, questions):
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"Helper to finalize a dns.name_packet"
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packet.qdcount = len(questions)
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packet.questions = questions
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def make_name_question(self, name, qtype, qclass):
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"Helper creating a dns.name_question"
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q = dns.name_question()
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q.name = name
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q.question_type = qtype
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q.question_class = qclass
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return q
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def make_txt_record(self, records):
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rdata_txt = dns.txt_record()
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s_list = dnsp.string_list()
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s_list.count = len(records)
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s_list.str = records
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rdata_txt.txt = s_list
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return rdata_txt
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def get_dns_domain(self):
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"Helper to get dns domain"
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return self.creds.get_realm().lower()
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def dns_transaction_udp(self, packet, host,
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dump=False, timeout=timeout):
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"send a DNS query and read the reply"
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s = None
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try:
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send_packet = ndr.ndr_pack(packet)
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if dump:
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print self.hexdump(send_packet)
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s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM, 0)
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s.settimeout(timeout)
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s.connect((host, 53))
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s.sendall(send_packet, 0)
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recv_packet = s.recv(2048, 0)
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if dump:
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print self.hexdump(recv_packet)
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response = ndr.ndr_unpack(dns.name_packet, recv_packet)
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return (response, recv_packet)
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finally:
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if s is not None:
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s.close()
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def dns_transaction_tcp(self, packet, host,
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dump=False, timeout=timeout):
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"send a DNS query and read the reply, also return the raw packet"
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s = None
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try:
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send_packet = ndr.ndr_pack(packet)
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if dump:
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print self.hexdump(send_packet)
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s = socket.socket(socket.AF_INET, socket.SOCK_STREAM, 0)
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s.settimeout(timeout)
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s.connect((host, 53))
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tcp_packet = struct.pack('!H', len(send_packet))
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tcp_packet += send_packet
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s.sendall(tcp_packet)
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recv_packet = s.recv(0xffff + 2, 0)
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if dump:
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print self.hexdump(recv_packet)
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response = ndr.ndr_unpack(dns.name_packet, recv_packet[2:])
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finally:
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if s is not None:
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s.close()
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# unpacking and packing again should produce same bytestream
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my_packet = ndr.ndr_pack(response)
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self.assertEquals(my_packet, recv_packet[2:])
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return (response, recv_packet[2:])
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def tkey_trans(self):
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"Do a TKEY transaction and establish a gensec context"
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self.key_name = "%s.%s" % (uuid.uuid4(), self.get_dns_domain())
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p = self.make_name_packet(dns.DNS_OPCODE_QUERY)
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q = self.make_name_question(self.key_name,
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dns.DNS_QTYPE_TKEY,
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dns.DNS_QCLASS_IN)
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questions = []
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questions.append(q)
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self.finish_name_packet(p, questions)
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r = dns.res_rec()
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r.name = self.key_name
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r.rr_type = dns.DNS_QTYPE_TKEY
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r.rr_class = dns.DNS_QCLASS_IN
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r.ttl = 0
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r.length = 0xffff
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rdata = dns.tkey_record()
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rdata.algorithm = "gss-tsig"
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rdata.inception = int(time.time())
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rdata.expiration = int(time.time()) + 60*60
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rdata.mode = dns.DNS_TKEY_MODE_GSSAPI
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rdata.error = 0
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rdata.other_size = 0
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self.g = gensec.Security.start_client(self.settings)
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self.g.set_credentials(self.creds)
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self.g.set_target_service("dns")
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self.g.set_target_hostname(self.server)
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self.g.want_feature(gensec.FEATURE_SIGN)
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self.g.start_mech_by_name("spnego")
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finished = False
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client_to_server = ""
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(finished, server_to_client) = self.g.update(client_to_server)
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self.assertFalse(finished)
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data = [ord(x) for x in list(server_to_client)]
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rdata.key_data = data
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rdata.key_size = len(data)
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r.rdata = rdata
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additional = [r]
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p.arcount = 1
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p.additional = additional
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(response, response_packet) = self.dns_transaction_tcp(p, self.server_ip)
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self.assert_dns_rcode_equals(response, dns.DNS_RCODE_OK)
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tkey_record = response.answers[0].rdata
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data = [chr(x) for x in tkey_record.key_data]
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server_to_client = ''.join(data)
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(finished, client_to_server) = self.g.update(server_to_client)
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self.assertTrue(finished)
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self.verify_packet(response, response_packet)
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def verify_packet(self, response, response_packet, request_mac=""):
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self.assertEqual(response.additional[0].rr_type, dns.DNS_QTYPE_TSIG)
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tsig_record = response.additional[0].rdata
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mac = ''.join([chr(x) for x in tsig_record.mac])
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# Cut off tsig record from dns response packet for MAC verification
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# and reset additional record count.
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key_name_len = len(self.key_name) + 2
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tsig_record_len = len(ndr.ndr_pack(tsig_record)) + key_name_len + 10
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response_packet_list = list(response_packet)
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del response_packet_list[-tsig_record_len:]
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response_packet_list[11] = chr(0)
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response_packet_wo_tsig = ''.join(response_packet_list)
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fake_tsig = dns.fake_tsig_rec()
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fake_tsig.name = self.key_name
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fake_tsig.rr_class = dns.DNS_QCLASS_ANY
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fake_tsig.ttl = 0
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fake_tsig.time_prefix = tsig_record.time_prefix
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fake_tsig.time = tsig_record.time
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fake_tsig.algorithm_name = tsig_record.algorithm_name
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fake_tsig.fudge = tsig_record.fudge
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fake_tsig.error = 0
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fake_tsig.other_size = 0
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fake_tsig_packet = ndr.ndr_pack(fake_tsig)
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data = request_mac + response_packet_wo_tsig + fake_tsig_packet
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self.g.check_packet(data, data, mac)
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def sign_packet(self, packet, key_name):
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"Sign a packet, calculate a MAC and add TSIG record"
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packet_data = ndr.ndr_pack(packet)
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fake_tsig = dns.fake_tsig_rec()
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fake_tsig.name = key_name
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fake_tsig.rr_class = dns.DNS_QCLASS_ANY
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fake_tsig.ttl = 0
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fake_tsig.time_prefix = 0
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fake_tsig.time = int(time.time())
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fake_tsig.algorithm_name = "gss-tsig"
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fake_tsig.fudge = 300
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fake_tsig.error = 0
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fake_tsig.other_size = 0
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fake_tsig_packet = ndr.ndr_pack(fake_tsig)
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data = packet_data + fake_tsig_packet
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mac = self.g.sign_packet(data, data)
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mac_list = [ord(x) for x in list(mac)]
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rdata = dns.tsig_record()
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rdata.algorithm_name = "gss-tsig"
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rdata.time_prefix = 0
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rdata.time = fake_tsig.time
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rdata.fudge = 300
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rdata.original_id = packet.id
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rdata.error = 0
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rdata.other_size = 0
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rdata.mac = mac_list
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rdata.mac_size = len(mac_list)
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r = dns.res_rec()
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r.name = key_name
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r.rr_type = dns.DNS_QTYPE_TSIG
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r.rr_class = dns.DNS_QCLASS_ANY
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r.ttl = 0
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r.length = 0xffff
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r.rdata = rdata
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additional = [r]
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packet.additional = additional
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packet.arcount = 1
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return mac
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def bad_sign_packet(self, packet, key_name):
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'''Add bad signature for a packet by bitflipping
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the final byte in the MAC'''
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mac_list = [ord(x) for x in list("badmac")]
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rdata = dns.tsig_record()
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rdata.algorithm_name = "gss-tsig"
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rdata.time_prefix = 0
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rdata.time = int(time.time())
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rdata.fudge = 300
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rdata.original_id = packet.id
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rdata.error = 0
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rdata.other_size = 0
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rdata.mac = mac_list
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rdata.mac_size = len(mac_list)
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r = dns.res_rec()
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r.name = key_name
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r.rr_type = dns.DNS_QTYPE_TSIG
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r.rr_class = dns.DNS_QCLASS_ANY
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r.ttl = 0
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r.length = 0xffff
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r.rdata = rdata
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additional = [r]
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packet.additional = additional
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packet.arcount = 1
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def search_record(self, name):
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p = self.make_name_packet(dns.DNS_OPCODE_QUERY)
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questions = []
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q = self.make_name_question(name, dns.DNS_QTYPE_TXT, dns.DNS_QCLASS_IN)
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questions.append(q)
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self.finish_name_packet(p, questions)
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(response, response_packet) = self.dns_transaction_udp(p, self.server_ip)
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return response.operation & 0x000F
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def make_update_request(self, delete=False):
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"Create a DNS update request"
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rr_class = dns.DNS_QCLASS_IN
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ttl = 900
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if delete:
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rr_class = dns.DNS_QCLASS_NONE
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ttl = 0
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p = self.make_name_packet(dns.DNS_OPCODE_UPDATE)
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q = self.make_name_question(self.get_dns_domain(),
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dns.DNS_QTYPE_SOA,
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dns.DNS_QCLASS_IN)
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questions = []
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questions.append(q)
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self.finish_name_packet(p, questions)
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updates = []
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r = dns.res_rec()
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r.name = self.newrecname
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r.rr_type = dns.DNS_QTYPE_TXT
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r.rr_class = rr_class
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r.ttl = ttl
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r.length = 0xffff
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rdata = self.make_txt_record(['"This is a test"'])
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r.rdata = rdata
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updates.append(r)
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p.nscount = len(updates)
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p.nsrecs = updates
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return p
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class TestDNSUpdates(DNSTest):
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def test_tkey(self):
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"test DNS TKEY handshake"
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self.tkey_trans()
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def test_update_wo_tsig(self):
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"test DNS update without TSIG record"
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p = self.make_update_request()
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(response, response_p) = self.dns_transaction_udp(p, self.server_ip)
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self.assert_dns_rcode_equals(response, dns.DNS_RCODE_REFUSED)
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rcode = self.search_record(self.newrecname)
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self.assert_rcode_equals(rcode, dns.DNS_RCODE_NXDOMAIN)
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def test_update_tsig_bad_keyname(self):
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"test DNS update with a TSIG record with a bad keyname"
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self.tkey_trans()
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p = self.make_update_request()
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self.sign_packet(p, "badkey")
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(response, response_p) = self.dns_transaction_udp(p, self.server_ip)
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self.assert_dns_rcode_equals(response, dns.DNS_RCODE_NOTAUTH)
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tsig_record = response.additional[0].rdata
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self.assertEquals(tsig_record.error, dns.DNS_RCODE_BADKEY)
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self.assertEquals(tsig_record.mac_size, 0)
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rcode = self.search_record(self.newrecname)
|
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self.assert_rcode_equals(rcode, dns.DNS_RCODE_NXDOMAIN)
|
||||
|
||||
def test_update_tsig_bad_mac(self):
|
||||
"test DNS update with a TSIG record with a bad MAC"
|
||||
|
||||
self.tkey_trans()
|
||||
|
||||
p = self.make_update_request()
|
||||
self.bad_sign_packet(p, self.key_name)
|
||||
(response, response_p) = self.dns_transaction_udp(p, self.server_ip)
|
||||
self.assert_dns_rcode_equals(response, dns.DNS_RCODE_NOTAUTH)
|
||||
tsig_record = response.additional[0].rdata
|
||||
self.assertEquals(tsig_record.error, dns.DNS_RCODE_BADSIG)
|
||||
self.assertEquals(tsig_record.mac_size, 0)
|
||||
|
||||
rcode = self.search_record(self.newrecname)
|
||||
self.assert_rcode_equals(rcode, dns.DNS_RCODE_NXDOMAIN)
|
||||
|
||||
def test_update_tsig(self):
|
||||
"test DNS update with correct TSIG record"
|
||||
|
||||
self.tkey_trans()
|
||||
|
||||
p = self.make_update_request()
|
||||
mac = self.sign_packet(p, self.key_name)
|
||||
(response, response_p) = self.dns_transaction_udp(p, self.server_ip)
|
||||
self.assert_dns_rcode_equals(response, dns.DNS_RCODE_OK)
|
||||
self.verify_packet(response, response_p, mac)
|
||||
|
||||
# Check the record is around
|
||||
rcode = self.search_record(self.newrecname)
|
||||
self.assert_rcode_equals(rcode, dns.DNS_RCODE_OK)
|
||||
|
||||
# Now delete the record
|
||||
p = self.make_update_request(delete=True)
|
||||
mac = self.sign_packet(p, self.key_name)
|
||||
(response, response_p) = self.dns_transaction_udp(p, self.server_ip)
|
||||
self.assert_dns_rcode_equals(response, dns.DNS_RCODE_OK)
|
||||
self.verify_packet(response, response_p, mac)
|
||||
|
||||
# check it's gone
|
||||
rcode = self.search_record(self.newrecname)
|
||||
self.assert_rcode_equals(rcode, dns.DNS_RCODE_NXDOMAIN)
|
||||
|
||||
TestProgram(module=__name__, opts=subunitopts)
|
||||
@ -360,6 +360,8 @@ plantestsuite_loadlist("samba.tests.dns", "fl2003dc:local", [python, os.path.joi
|
||||
|
||||
plantestsuite_loadlist("samba.tests.dns_forwarder", "fl2003dc:local", [python, os.path.join(srcdir(), "python/samba/tests/dns_forwarder.py"), '$SERVER', '$SERVER_IP', '$DNS_FORWARDER1', '$DNS_FORWARDER2', '--machine-pass', '-U"$USERNAME%$PASSWORD"', '--workgroup=$DOMAIN', '$LOADLIST', '$LISTOPT'])
|
||||
|
||||
plantestsuite_loadlist("samba.tests.dns_tkey", "fl2008r2dc", [python, os.path.join(srcdir(), "python/samba/tests/dns_tkey.py"), '$SERVER', '$SERVER_IP', '--machine-pass', '-U"$USERNAME%$PASSWORD"', '--workgroup=$DOMAIN', '$LOADLIST', '$LISTOPT'])
|
||||
|
||||
for t in smbtorture4_testsuites("dns_internal."):
|
||||
plansmbtorture4testsuite(t, "ad_dc_ntvfs:local", '//$SERVER/whavever')
|
||||
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user