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-rw-r--r--bin/tests/system/cookie/ans9/ans.py300
1 files changed, 300 insertions, 0 deletions
diff --git a/bin/tests/system/cookie/ans9/ans.py b/bin/tests/system/cookie/ans9/ans.py
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+++ b/bin/tests/system/cookie/ans9/ans.py
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+# Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+#
+# SPDX-License-Identifier: MPL-2.0
+#
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, you can obtain one at https://mozilla.org/MPL/2.0/.
+#
+# See the COPYRIGHT file distributed with this work for additional
+# information regarding copyright ownership.
+
+from __future__ import print_function
+import os
+import sys
+import signal
+import socket
+import select
+from datetime import datetime, timedelta
+import time
+import functools
+
+import dns
+import dns.edns
+import dns.flags
+import dns.message
+import dns.query
+import dns.tsig
+import dns.tsigkeyring
+import dns.version
+
+from dns.edns import *
+from dns.name import *
+from dns.rcode import *
+from dns.rdataclass import *
+from dns.rdatatype import *
+from dns.tsig import *
+
+
+# Log query to file
+def logquery(type, qname):
+ with open("qlog", "a") as f:
+ f.write("%s %s\n", type, qname)
+
+
+# DNS 2.0 keyring specifies the algorithm
+try:
+ keyring = dns.tsigkeyring.from_text(
+ {
+ "foo": {"hmac-sha256", "aaaaaaaaaaaa"},
+ "fake": {"hmac-sha256", "aaaaaaaaaaaa"},
+ }
+ )
+except:
+ keyring = dns.tsigkeyring.from_text({"foo": "aaaaaaaaaaaa", "fake": "aaaaaaaaaaaa"})
+
+dopass2 = False
+
+
+############################################################################
+#
+# This server will serve valid and spoofed answers. A spoofed answer will
+# have the address 10.53.0.10 included.
+#
+# When receiving a query over UDP:
+#
+# A query to "nocookie"/A will result in a spoofed answer with no cookie set.
+# A query to "tcponly"/A will result in a spoofed answer with no cookie set.
+# A query to "withtsig"/A will result in two responses, the first is a spoofed
+# answer that is TSIG signed, the second is a valid answer with a cookie set.
+# A query to anything else will result in a valid answer with a cookie set.
+#
+# When receiving a query over TCP:
+#
+# A query to "nocookie"/A will result in a valid answer with no cookie set.
+# A query to anything else will result in a valid answer with a cookie set.
+#
+############################################################################
+def create_response(msg, tcp, first, ns10):
+ global dopass2
+ m = dns.message.from_wire(msg, keyring=keyring)
+ qname = m.question[0].name.to_text()
+ lqname = qname.lower()
+ labels = lqname.split(".")
+ rrtype = m.question[0].rdtype
+ typename = dns.rdatatype.to_text(rrtype)
+
+ with open("query.log", "a") as f:
+ f.write("%s %s\n" % (typename, qname))
+ print("%s %s" % (typename, qname), end=" ")
+
+ r = dns.message.make_response(m)
+ r.set_rcode(NOERROR)
+ if rrtype == A:
+ # exempt potential nameserver A records.
+ if labels[0] == "ns" and ns10:
+ r.answer.append(dns.rrset.from_text(qname, 1, IN, A, "10.53.0.10"))
+ else:
+ r.answer.append(dns.rrset.from_text(qname, 1, IN, A, "10.53.0.9"))
+ if not tcp and labels[0] == "nocookie":
+ r.answer.append(dns.rrset.from_text(qname, 1, IN, A, "10.53.0.10"))
+ if not tcp and labels[0] == "tcponly":
+ r.answer.append(dns.rrset.from_text(qname, 1, IN, A, "10.53.0.10"))
+ if first and not tcp and labels[0] == "withtsig":
+ r.answer.append(dns.rrset.from_text(qname, 1, IN, A, "10.53.0.10"))
+ dopass2 = True
+ elif rrtype == NS:
+ r.answer.append(dns.rrset.from_text(qname, 1, IN, NS, "."))
+ elif rrtype == SOA:
+ r.answer.append(dns.rrset.from_text(qname, 1, IN, SOA, ". . 0 0 0 0 0"))
+ else:
+ r.authority.append(dns.rrset.from_text(qname, 1, IN, SOA, ". . 0 0 0 0 0"))
+ # Add a server cookie to the response
+ if labels[0] != "nocookie":
+ for o in m.options:
+ if o.otype == 10: # Use 10 instead of COOKIE
+ if first and labels[0] == "withtsig" and not tcp:
+ r.use_tsig(
+ keyring=keyring,
+ keyname=dns.name.from_text("fake"),
+ algorithm=HMAC_SHA256,
+ )
+ elif labels[0] != "tcponly" or tcp:
+ cookie = o
+ if len(o.data) == 8:
+ cookie.data = o.data + o.data
+ else:
+ cookie.data = o.data
+ r.use_edns(options=[cookie])
+ r.flags |= dns.flags.AA
+ return r
+
+
+def sigterm(signum, frame):
+ print("Shutting down now...")
+ os.remove("ans.pid")
+ running = False
+ sys.exit(0)
+
+
+############################################################################
+# Main
+#
+# Set up responder and control channel, open the pid file, and start
+# the main loop, listening for queries on the query channel or commands
+# on the control channel and acting on them.
+############################################################################
+ip4_addr1 = "10.53.0.9"
+ip4_addr2 = "10.53.0.10"
+ip6_addr1 = "fd92:7065:b8e:ffff::9"
+ip6_addr2 = "fd92:7065:b8e:ffff::10"
+
+try:
+ port = int(os.environ["PORT"])
+except:
+ port = 5300
+
+query4_udp1 = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
+query4_udp1.bind((ip4_addr1, port))
+query4_tcp1 = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+query4_tcp1.bind((ip4_addr1, port))
+query4_tcp1.listen(1)
+query4_tcp1.settimeout(1)
+
+query4_udp2 = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
+query4_udp2.bind((ip4_addr2, port))
+query4_tcp2 = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+query4_tcp2.bind((ip4_addr2, port))
+query4_tcp2.listen(1)
+query4_tcp2.settimeout(1)
+
+havev6 = True
+query6_udp1 = None
+query6_udp2 = None
+query6_tcp1 = None
+query6_tcp2 = None
+try:
+ query6_udp1 = socket.socket(socket.AF_INET6, socket.SOCK_DGRAM)
+ query6_udp1.bind((ip6_addr1, port))
+ query6_tcp1 = socket.socket(socket.AF_INET6, socket.SOCK_STREAM)
+ query6_tcp1.bind((ip6_addr1, port))
+ query6_tcp1.listen(1)
+ query6_tcp1.settimeout(1)
+
+ query6_udp2 = socket.socket(socket.AF_INET6, socket.SOCK_DGRAM)
+ query6_udp2.bind((ip6_addr2, port))
+ query6_tcp2 = socket.socket(socket.AF_INET6, socket.SOCK_STREAM)
+ query6_tcp2.bind((ip6_addr2, port))
+ query6_tcp2.listen(1)
+ query6_tcp2.settimeout(1)
+except:
+ if query6_udp1 != None:
+ query6_udp1.close()
+ if query6_tcp1 != None:
+ query6_tcp1.close()
+ if query6_udp2 != None:
+ query6_udp2.close()
+ if query6_tcp2 != None:
+ query6_tcp2.close()
+ havev6 = False
+
+signal.signal(signal.SIGTERM, sigterm)
+
+f = open("ans.pid", "w")
+pid = os.getpid()
+print(pid, file=f)
+f.close()
+
+running = True
+
+print("Using DNS version %s" % dns.version.version)
+print("Listening on %s port %d" % (ip4_addr1, port))
+print("Listening on %s port %d" % (ip4_addr2, port))
+if havev6:
+ print("Listening on %s port %d" % (ip6_addr1, port))
+ print("Listening on %s port %d" % (ip6_addr2, port))
+print("Ctrl-c to quit")
+
+if havev6:
+ input = [
+ query4_udp1,
+ query6_udp1,
+ query4_tcp1,
+ query6_tcp1,
+ query4_udp2,
+ query6_udp2,
+ query4_tcp2,
+ query6_tcp2,
+ ]
+else:
+ input = [query4_udp1, query4_tcp1, query4_udp2, query4_tcp2]
+
+while running:
+ try:
+ inputready, outputready, exceptready = select.select(input, [], [])
+ except select.error as e:
+ break
+ except socket.error as e:
+ break
+ except KeyboardInterrupt:
+ break
+
+ for s in inputready:
+ ns10 = False
+ if s == query4_udp1 or s == query6_udp1 or s == query4_udp2 or s == query6_udp2:
+ if s == query4_udp1 or s == query6_udp1:
+ print(
+ "UDP Query received on %s"
+ % (ip4_addr1 if s == query4_udp1 else ip6_addr1),
+ end=" ",
+ )
+ if s == query4_udp2 or s == query6_udp2:
+ print(
+ "UDP Query received on %s"
+ % (ip4_addr2 if s == query4_udp2 else ip6_addr2),
+ end=" ",
+ )
+ ns10 = True
+ # Handle incoming queries
+ msg = s.recvfrom(65535)
+ dopass2 = False
+ rsp = create_response(msg[0], False, True, ns10)
+ print(dns.rcode.to_text(rsp.rcode()))
+ s.sendto(rsp.to_wire(), msg[1])
+ if dopass2:
+ print("Sending second UDP response without TSIG", end=" ")
+ rsp = create_response(msg[0], False, False, ns10)
+ s.sendto(rsp.to_wire(), msg[1])
+ print(dns.rcode.to_text(rsp.rcode()))
+
+ if s == query4_tcp1 or s == query6_tcp1 or s == query4_tcp2 or s == query6_tcp2:
+ try:
+ (cs, _) = s.accept()
+ if s == query4_tcp1 or s == query6_tcp1:
+ print(
+ "TCP Query received on %s"
+ % (ip4_addr1 if s == query4_tcp1 else ip6_addr1),
+ end=" ",
+ )
+ if s == query4_tcp2 or s == query6_tcp2:
+ print(
+ "TCP Query received on %s"
+ % (ip4_addr2 if s == query4_tcp2 else ip6_addr2),
+ end=" ",
+ )
+ ns10 = True
+ # get TCP message length
+ buf = cs.recv(2)
+ length = struct.unpack(">H", buf[:2])[0]
+ # grep DNS message
+ msg = cs.recv(length)
+ rsp = create_response(msg, True, True, ns10)
+ print(dns.rcode.to_text(rsp.rcode()))
+ wire = rsp.to_wire()
+ cs.send(struct.pack(">H", len(wire)))
+ cs.send(wire)
+ cs.close()
+ except s.timeout:
+ pass
+ if not running:
+ break
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-19 08:33:03 +0000