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#!/usr/bin/python3
"""
Generate RFC 5011 test simulating successful KSK roll-over in 2017.
Dependencies: Knot DNS server + Deckard library.
Environment: Set PYTHONPATH variable so "import pydnstest" will use module from Deckard.
Input: Root zone files, presumably created by genkeyszones.sh.
Output: RPL file for Deckard on standard output.
"""
import copy
import datetime
import os.path
import subprocess
import time
import dns.resolver
import pydnstest.scenario
try:
VARIANT = os.environ["VARIANT"]
except KeyError:
VARIANT = ""
def store_answer(qname, qtype, template):
answ = dns.resolver.query(qname, qtype, raise_on_no_answer=False)
entr = copy.copy(template)
entr.message = answ.response
return entr
def resolver_init():
"""
Configure dns.resolver to ask ::1@5353 with EDNS0 DO set.
"""
dns.resolver.reset_default_resolver()
dns.resolver.default_resolver.use_edns(0, dns.flags.DO, 4096)
dns.resolver.default_resolver.nameservers = ['::1']
dns.resolver.default_resolver.nameserver_ports = {'::1': 5353}
dns.resolver.default_resolver.flags = 0
def get_templates():
"""
Return empty objects for RANGE and ENTRY suitable as object templates.
"""
empty_case, _ = pydnstest.scenario.parse_file(os.path.realpath('empty.rpl'))
rng = copy.copy(empty_case.ranges[0])
entry = copy.copy(rng.stored[0])
entry.adjust_fields = ['copy_id']
entry.match_fields = ['opcode', 'question']
rng.addresses = {'198.41.0.4', '2001:503:ba3e::2:30'}
rng.stored = []
return rng, entry
def generate_range(filename, rng_templ, entry_templ):
"""
Run Knot DNS server with specified zone file and generate RANGE object.
"""
assert filename.startswith('20')
assert filename.endswith('.db')
try:
os.unlink('root.db')
except FileNotFoundError:
pass
os.link(filename, 'root.db')
# run server
knotd = subprocess.Popen(['knotd', '-c', 'knot.root.conf', '-s', '/tmp/knot-dns2rpl.sock'])
time.sleep(0.1) # give kresd time to start so we do not wait for first timeout
# query data
rng = copy.copy(rng_templ)
rng.stored = []
rng.stored.append(store_answer('.', 'SOA', entry_templ))
rng.stored.append(store_answer('.', 'DNSKEY', entry_templ))
rng.stored.append(store_answer('.', 'NS', entry_templ))
rng.stored.append(store_answer('rootns.', 'NS', entry_templ))
rng.stored.append(store_answer('rootns.', 'A', entry_templ))
rng.stored.append(store_answer('rootns.', 'AAAA', entry_templ))
rng.stored.append(store_answer('test.', 'TXT', entry_templ))
rng.a = int(filename[:-len('.db')])
# kill server
knotd.kill()
return rng
def generate_step_query(tcurr, id_prefix):
out = '; {0}'.format(tcurr.isoformat())
out += '''
STEP {0}000000 QUERY
ENTRY_BEGIN
REPLY RD AD
SECTION QUESTION
test. IN TXT
ENTRY_END
'''.format(id_prefix)
return out
def generate_step_check(id_prefix):
return '''STEP {0}000001 CHECK_ANSWER
ENTRY_BEGIN
REPLY QR RD RA AD
MATCH opcode rcode flags question answer
SECTION QUESTION
test. IN TXT
SECTION ANSWER
test. IN TXT "it works"
ENTRY_END
'''.format(id_prefix)
def generate_step_nocheck(id_prefix):
return '''STEP {0}000001 CHECK_ANSWER
ENTRY_BEGIN
REPLY QR RD RA AD
MATCH opcode qname question
SECTION QUESTION
test. IN TXT
SECTION ANSWER
test. IN TXT "it works"
ENTRY_END
'''.format(id_prefix)
def generate_step_finish_msg(id_prefix):
return '''STEP {0}000001 CHECK_ANSWER
ENTRY_BEGIN
REPLY QR RD RA AA NXDOMAIN
MATCH opcode rcode flags question answer
SECTION QUESTION
test. IN TXT
SECTION AUTHORITY
test. 10800 IN SOA test. nobody.invalid. 1 3600 1200 604800 10800
SECTION ADDITIONAL
explanation.invalid. 10800 IN TXT "check last answer"
ENTRY_END
'''.format(id_prefix)
def generate_step_elapse(tstep, id_prefix):
out = '; move time by {0}\n'.format(tstep)
out += '''STEP {0}000099 TIME_PASSES ELAPSE {1}\n\n'''.format(
id_prefix, int(tstep.total_seconds()))
return out
def main():
resolver_init()
rng_templ, entry_templ = get_templates()
ranges = []
check_last_msg = False
# transform data in zones files into RANGEs
files = os.listdir()
files.sort()
for fn in files:
if not fn.endswith('.db') or not fn.startswith('20'):
continue
ranges.append(generate_range(fn, rng_templ, entry_templ))
# connect ranges
for i in range(1, len(ranges)):
ranges[i - 1].b = ranges[i].a - 1
ranges[-1].b = 99999999999999
# steps
steps = []
tstart = datetime.datetime(year=2017, month=7, day=1)
if VARIANT == "unmanaged_key":
tend = datetime.datetime(year=2017, month=7, day=21, hour=23, minute=59, second=59)
check_last_msg = True
else:
tend = datetime.datetime(year=2017, month=12, day=31, hour=23, minute=59, second=59)
tstep = datetime.timedelta(days=1)
tcurr = tstart
while tcurr < tend:
id_prefix = tcurr.strftime('%Y%m%d')
steps.append(generate_step_query(tcurr, id_prefix))
if (check_last_msg is True and tcurr + tstep > tend):
steps.append(generate_step_finish_msg(id_prefix))
elif VARIANT == "unmanaged_key":
steps.append(generate_step_nocheck(id_prefix))
else:
steps.append(generate_step_check(id_prefix))
steps.append(generate_step_elapse(tstep, id_prefix))
tcurr += tstep
# generate output
with open('keys/ds') as dsfile:
tas = dsfile.read().strip()
# constant RPL file header
print("stub-addr: 2001:503:ba3e::2:30")
for ta in tas.split('\n'):
print ("trust-anchor: " + ta)
print("""val-override-date: 20170701000000
query-minimization: off
CONFIG_END
SCENARIO_BEGIN Simulation of successful RFC 5011 KSK roll-over during 2017
""".format(ta=ta))
for rng in ranges:
print(rng)
for step in steps:
print(step)
# constant RPL file footer
print('''
SCENARIO_END
''')
if __name__ == '__main__':
main()
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