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dnsmasq: add fix related to DNSSEC verification from upstream
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To find the DS record for a given zone the parent zone's nameserver must
be queried and not the nameserver for the zone. Otherwise DNSSEC
verification for unsigned delegations breaks.

Signed-off-by: Uwe Kleine-König <uwe+openwrt@kleine-koenig.org>
Link: https://patchwork.ozlabs.org/project/openwrt/patch/20250127151223.1420006-1-uwe+openwrt@kleine-koenig.org/
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
(cherry picked from commit 6dc0f0c50cf1072ec3751c0fb1fc152a0a86487d)
This commit is contained in:
Uwe Kleine-König 2025-01-27 16:12:23 +01:00 committed by Hauke Mehrtens
parent 50cb934142
commit daef29c75d
2 changed files with 99 additions and 1 deletions
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2
package/network/services/dnsmasq/Makefile
View File

@ -10,7 +10,7 @@ include $(TOPDIR)/rules.mk
PKG_NAME:=dnsmasq
PKG_UPSTREAM_VERSION:=2.90
PKG_VERSION:=$(subst test,~~test,$(subst rc,~rc,$(PKG_UPSTREAM_VERSION)))
PKG_RELEASE:=3
PKG_RELEASE:=4
PKG_SOURCE:=$(PKG_NAME)-$(PKG_UPSTREAM_VERSION).tar.xz
PKG_SOURCE_URL:=https://thekelleys.org.uk/dnsmasq/

98
package/network/services/dnsmasq/patches/0003-Handle-DS-queries-to-auth-zones.patch Normal file
View File

@ -0,0 +1,98 @@
From 8ce27433f8b2e17c557cb55e4f16941d309deeac Mon Sep 17 00:00:00 2001
From: Simon Kelley <simon@thekelleys.org.uk>
Date: Fri, 17 Jan 2025 17:49:29 +0000
Subject: [PATCH] Handle DS queries to auth zones.
Origin: upstream, v2.91test8
When dnsmasq is configured to act as an authoritative server and has
an authoritative zone configured, and recieves a query for
that zone _as_forwarder_ it answers the query directly rather
than forwarding it. This doesn't affect the answer, but it
saves dnsmasq forwarding the query to the recusor upstream,
whch then bounces it back to dnsmasq in auth mode. The
exception should be when the query is for the root of zone, for a DS
RR. The answer to that has to come from the parent, via the
recursor, and will typically be a proof-of-nonexistence since
dnsmasq doesn't support signed zones. This patch suppresses
local answers and forces forwarding to the upstream recursor
for such queries. It stops breakage when a DNSSEC validating
client makes queries to dnsmasq acting as forwarder for a zone
for which it is authoritative.
[ukleinek: drop changes to CHANGELOG to prevent conflicts]
---
src/forward.c | 52 +++++++++++++++++++++++++++++++++++++--------------
1 file changed, 38 insertions(+), 14 deletions(-)
--- a/src/forward.c
+++ b/src/forward.c
@@ -1744,15 +1744,27 @@ void receive_query(struct listener *list
#endif
#ifdef HAVE_AUTH
- /* find queries for zones we're authoritative for, and answer them directly */
+ /* Find queries for zones we're authoritative for, and answer them directly.
+ The exception to this is DS queries for the zone route. They
+ have to come from the parent zone. Since dnsmasq's auth server
+ can't do DNSSEC, the zone will be unsigned, and anything using
+ dnsmasq as a forwarder and doing validation will be expecting to
+ see the proof of non-existence from the parent. */
if (!auth_dns && !option_bool(OPT_LOCALISE))
for (zone = daemon->auth_zones; zone; zone = zone->next)
- if (in_zone(zone, daemon->namebuff, NULL))
- {
- auth_dns = 1;
- local_auth = 1;
- break;
- }
+ {
+ char *cut;
+
+ if (in_zone(zone, daemon->namebuff, &cut))
+ {
+ if (type != T_DS || cut)
+ {
+ auth_dns = 1;
+ local_auth = 1;
+ }
+ break;
+ }
+ }
#endif
#ifdef HAVE_LOOP
@@ -2268,15 +2280,27 @@ unsigned char *tcp_request(int confd, ti
&peer_addr, auth_dns ? "auth" : "query", qtype);
#ifdef HAVE_AUTH
- /* find queries for zones we're authoritative for, and answer them directly */
+ /* Find queries for zones we're authoritative for, and answer them directly.
+ The exception to this is DS queries for the zone route. They
+ have to come from the parent zone. Since dnsmasq's auth server
+ can't do DNSSEC, the zone will be unsigned, and anything using
+ dnsmasq as a forwarder and doing validation will be expecting to
+ see the proof of non-existence from the parent. */
if (!auth_dns && !option_bool(OPT_LOCALISE))
for (zone = daemon->auth_zones; zone; zone = zone->next)
- if (in_zone(zone, daemon->namebuff, NULL))
- {
- auth_dns = 1;
- local_auth = 1;
- break;
- }
+ {
+ char *cut;
+
+ if (in_zone(zone, daemon->namebuff, &cut))
+ {
+ if (qtype != T_DS || cut)
+ {
+ auth_dns = 1;
+ local_auth = 1;
+ }
+ break;
+ }
+ }
#endif
}
}