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Test proof of nonexistance of DS in insecure referrals

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Currently this test is limited only to auth because currently BIND
resolver does not send DS proof of nonexistence for RD=0 queries.
This commit is contained in:
Petr Špaček 2025-07-11 10:22:33 +02:00
parent 73e4201331
commit 548632b18a
1 changed files with 28 additions and 3 deletions
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31
bin/tests/system/nsec3-answer/tests_nsec3.py
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@ -65,10 +65,35 @@ def do_test_query(
) )
def test_nodata(server, qname: dns.name.Name, named_port: int) -> None: def test_nodata(server, qname: dns.name.Name, named_port: int) -> None:
"""An existing name, no wildcards, but a query type for RRset which does not exist""" """An existing name, no wildcards, but a query type for RRset which does not exist"""
response, nsec3check = do_test_query(qname, dns.rdatatype.HINFO, server, named_port) _, nsec3check = do_test_query(qname, dns.rdatatype.HINFO, server, named_port)
assert response.rcode() is dns.rcode.NOERROR check_nodata(qname, nsec3check)
nsec3check.prove_name_exists(qname)
@pytest.mark.parametrize("server", [pytest.param(AUTH, id="ns1")])
@given(
qname=dns_names(
suffix=(ZONE.delegations - ZONE.get_names_with_type(dns.rdatatype.DS))
)
)
def test_nodata_ds(server, qname: dns.name.Name, named_port: int) -> None:
"""Auth sends proof of nonexistance with referral without DS RR. Opt-out is not supported."""
response, nsec3check = do_test_query(qname, dns.rdatatype.HINFO, server, named_port)
nsrr = None
for rrset in response.authority:
if rrset.rdtype == dns.rdatatype.NS:
nsrr = rrset
break
assert nsrr is not None, "NS RRset missing in delegation answer"
# DS RR does not exist so we must prove it by having NSEC3 with QNAME
check_nodata(nsrr.name, nsec3check)
def check_nodata(name: dns.name.Name, nsec3check: "NSEC3Checker"):
assert nsec3check.response.rcode() is dns.rcode.NOERROR
nsec3check.prove_name_exists(name)
nsec3check.check_extraneous_rrs() nsec3check.check_extraneous_rrs()