From 22e317bf62bfa5ff6839eea007068d2841ac37b0 Mon Sep 17 00:00:00 2001
From: pdns-recursor packagers <pdns-recursor@packages.debian.org>
Date: Tue, 19 May 2020 09:52:06 +0100
Subject: [PATCH] bogus-empty-nxd-4.1.15

===================================================================

Gbp-Pq: Name bogus-empty-nxd-4.1.15.diff
---
 syncres.cc         |  4 ++++
 test-syncres_cc.cc | 53 ++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 57 insertions(+)

diff --git a/syncres.cc b/syncres.cc
index 3840e31..2b00021 100644
--- a/syncres.cc
+++ b/syncres.cc
@@ -2569,6 +2569,10 @@ bool SyncRes::processAnswer(unsigned int depth, LWResult& lwr, const DNSName& qn
   if(lwr.d_rcode == RCode::NXDomain) {
     LOG(prefix<<qname<<": status=NXDOMAIN, we are done "<<(negindic ? "(have negative SOA)" : "")<<endl);
 
+    if (state == Secure && (lwr.d_aabit || sendRDQuery) && !negindic) {
+      updateValidationState(state, Bogus);
+    }
+
     if(d_doDNSSEC)
       addNXNSECS(ret, lwr.d_records);
 
diff --git a/test-syncres_cc.cc b/test-syncres_cc.cc
index 492b677..44ca74b 100644
--- a/test-syncres_cc.cc
+++ b/test-syncres_cc.cc
@@ -8299,6 +8299,59 @@ BOOST_AUTO_TEST_CASE(test_dnssec_bogus_nodata) {
   BOOST_CHECK_EQUAL(queriesCount, 4);
 }
 
+BOOST_AUTO_TEST_CASE(test_dnssec_bogus_nxdomain)
+{
+  std::unique_ptr<SyncRes> sr;
+  initSR(sr, true);
+
+  setDNSSECValidation(sr, DNSSECMode::ValidateAll);
+
+  primeHints();
+  const DNSName target("powerdns.com.");
+  testkeysset_t keys;
+
+  auto luaconfsCopy = g_luaconfs.getCopy();
+  luaconfsCopy.dsAnchors.clear();
+  generateKeyMaterial(DNSName("."), DNSSECKeeper::ECDSA256, DNSSECKeeper::SHA256, keys, luaconfsCopy.dsAnchors);
+  generateKeyMaterial(DNSName("com."), DNSSECKeeper::ECDSA256, DNSSECKeeper::SHA256, keys, luaconfsCopy.dsAnchors);
+  generateKeyMaterial(DNSName("powerdns.com."), DNSSECKeeper::ECDSA256, DNSSECKeeper::SHA256, keys);
+  g_luaconfs.setState(luaconfsCopy);
+
+  size_t queriesCount = 0;
+
+  sr->setAsyncCallback([target,&queriesCount,keys](const ComboAddress& ip, const DNSName& domain, int type, bool doTCP, bool sendRDQuery, int EDNS0Level, struct timeval* now, boost::optional<Netmask>& srcmask, boost::optional<const ResolveContext&> context, std::shared_ptr<RemoteLogger> outgoingLogger, LWResult* res, bool* chained) {
+    queriesCount++;
+
+    if (type == QType::DS || type == QType::DNSKEY) {
+      return genericDSAndDNSKEYHandler(res, domain, domain, type, keys);
+    }
+    else {
+
+      setLWResult(res, RCode::NXDomain, true, false, true);
+      return 1;
+    }
+
+    return 0;
+  });
+
+  vector<DNSRecord> ret;
+  int res = sr->beginResolve(target, QType(QType::A), QClass::IN, ret);
+  BOOST_CHECK_EQUAL(res, RCode::NXDomain);
+  BOOST_CHECK_EQUAL(sr->getValidationState(), Bogus);
+  BOOST_REQUIRE_EQUAL(ret.size(), 0U);
+  /* com|NS, powerdns.com|NS, powerdns.com|A */
+  BOOST_CHECK_EQUAL(queriesCount, 3U);
+
+  /* again, to test the cache */
+  ret.clear();
+  res = sr->beginResolve(target, QType(QType::A), QClass::IN, ret);
+  BOOST_CHECK_EQUAL(res, RCode::NXDomain);
+  BOOST_CHECK_EQUAL(sr->getValidationState(), Bogus);
+  BOOST_REQUIRE_EQUAL(ret.size(), 0U);
+  /* we don't store empty results */
+  BOOST_CHECK_EQUAL(queriesCount, 4U);
+}
+
 BOOST_AUTO_TEST_CASE(test_nsec_denial_nowrap) {
   init();
 
-- 
2.30.2