mir/bind
2
0
Fork 0
mirror of https://gitlab.isc.org/isc-projects/bind9 synced 2025-08-30 14:07:59 +00:00
Code Issues Releases Wiki Activity

Check SOA owner names in zone transfers

Browse Source 
An IXFR containing SOA records with owner names different than the
transferred zone's origin can result in named serving a version of that
zone without an SOA record at the apex.  This causes a RUNTIME_CHECK
assertion failure the next time such a zone is refreshed.  Fix by
immediately rejecting a zone transfer (either an incremental or
non-incremental one) upon detecting an SOA record not placed at the apex
of the transferred zone.
This commit is contained in:
Mark Andrews
2021-02-03 11:10:20 +11:00
committed by Michał Kępień
parent 0695a42adb
commit 01209dfa49
1 changed files with 14 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

14
lib/dns/xfrin.c
View File

@@ -498,6 +498,20 @@ xfr_rr(dns_xfrin_ctx_t *xfr, dns_name_t *name, uint32_t ttl,
FAIL(DNS_R_FORMERR);
}
/*
* Immediately reject the entire transfer if the RR that is currently
* being processed is an SOA record that is not placed at the zone
* apex.
*/
if (rdata->type == dns_rdatatype_soa &&
!dns_name_equal(&xfr->name, name)) {
char namebuf[DNS_NAME_FORMATSIZE];
dns_name_format(name, namebuf, sizeof(namebuf));
xfrin_log(xfr, ISC_LOG_DEBUG(3), "SOA name mismatch: '%s'",
namebuf);
FAIL(DNS_R_NOTZONETOP);
}
redo:
switch (xfr->state) {
case XFRST_SOAQUERY: