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From 4eff09c6b1e524b0efc393ee948b5c4cdf16ccb8 Mon Sep 17 00:00:00 2001
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From: Mark Andrews <marka@isc.org>
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Date: Wed, 3 Feb 2021 11:10:20 +1100
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Subject: [PATCH] Check SOA owner names in zone transfers
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An IXFR containing SOA records with owner names different than the
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transferred zone's origin can result in named serving a version of that
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zone without an SOA record at the apex. This causes a RUNTIME_CHECK
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assertion failure the next time such a zone is refreshed. Fix by
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immediately rejecting a zone transfer (either an incremental or
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non-incremental one) upon detecting an SOA record not placed at the apex
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of the transferred zone.
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---
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lib/dns/xfrin.c | 14 ++++++++++++++
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1 file changed, 14 insertions(+)
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diff --git a/lib/dns/xfrin.c b/lib/dns/xfrin.c
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index 3a3f407289..0ba82e4974 100644
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--- a/lib/dns/xfrin.c
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+++ b/lib/dns/xfrin.c
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@@ -477,6 +477,20 @@ xfr_rr(dns_xfrin_ctx_t *xfr, dns_name_t *name, uint32_t ttl,
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dns_rdatatype_ismeta(rdata->type))
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FAIL(DNS_R_FORMERR);
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+ /*
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+ * Immediately reject the entire transfer if the RR that is currently
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+ * being processed is an SOA record that is not placed at the zone
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+ * apex.
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+ */
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+ if (rdata->type == dns_rdatatype_soa &&
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+ !dns_name_equal(&xfr->name, name)) {
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+ char namebuf[DNS_NAME_FORMATSIZE];
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+ dns_name_format(name, namebuf, sizeof(namebuf));
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+ xfrin_log(xfr, ISC_LOG_DEBUG(3), "SOA name mismatch: '%s'",
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+ namebuf);
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+ FAIL(DNS_R_NOTZONETOP);
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+ }
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+
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redo:
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switch (xfr->state) {
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case XFRST_SOAQUERY:
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--
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2.26.3
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