From 53be802dbe13a954104dbe3e5b610d27e986ad41 Mon Sep 17 00:00:00 2001
From: Kees Monshouwer <mind04@monshouwer.org>
Date: Sun, 4 Jun 2017 13:31:54 +0200
Subject: [PATCH] auth: make sure Lua axfrfilter() does not insert out of zone
 data

---
 pdns/slavecommunicator.cc | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/pdns/slavecommunicator.cc b/pdns/slavecommunicator.cc
index 72f716887..0f854d27e 100644
--- a/pdns/slavecommunicator.cc
+++ b/pdns/slavecommunicator.cc
@@ -262,6 +262,10 @@ vector<DNSResourceRecord> doAxfr(const ComboAddress& raddr, const DNSName& domai
       }
 
       for(DNSResourceRecord& rr :  out) {
+        if(!rr.qname.isPartOf(domain)) {
+          L<<Logger::Error<<"Lua axfrfilter() filter tried to sneak in out-of-zone data '"<<i->qname<<"'|"<<i->qtype.getName()<<" during AXFR of zone '"<<domain<<"', ignoring"<<endl;
+          continue;
+        }
         if(!processRecordForZS(domain, firstNSEC3, rr, zs))
           continue;
         if(rr.qtype.getCode() == QType::SOA) {
-- 
2.40.0