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66 lines
2.3 KiB
66 lines
2.3 KiB
8 months ago
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From 8a7bff93037432fcfe8532752e89f150ea3030a4 Mon Sep 17 00:00:00 2001
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From: Petr Mensik <pemensik@redhat.com>
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Date: Mon, 9 Oct 2023 19:00:12 +0200
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Subject: [PATCH] Do not keep stale records by default
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By default set max-stale-ttl to 0, unless stale-answer-enable yes. This
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were enabled by mistake when backporting fix for CVE-2023-2828. It
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causes increased cache usage on servers not wanting to serve stale
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records. Fix that by setting smart defaults based on stale answers
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enabled with possible manual tuning.
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---
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bin/named/server.c | 25 +++++++++++++++++++------
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1 file changed, 19 insertions(+), 6 deletions(-)
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diff --git a/bin/named/server.c b/bin/named/server.c
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index 7af90d0..afdc4fa 100644
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--- a/bin/named/server.c
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+++ b/bin/named/server.c
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@@ -3295,7 +3295,7 @@ configure_view(dns_view_t *view, dns_viewlist_t *viewlist,
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size_t max_acache_size;
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size_t max_adb_size;
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uint32_t lame_ttl, fail_ttl;
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- uint32_t max_stale_ttl;
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+ uint32_t max_stale_ttl = 0;
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dns_tsig_keyring_t *ring = NULL;
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dns_view_t *pview = NULL; /* Production view */
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isc_mem_t *cmctx = NULL, *hmctx = NULL;
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@@ -3739,16 +3739,29 @@ configure_view(dns_view_t *view, dns_viewlist_t *viewlist,
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if (view->maxncachettl > 7 * 24 * 3600)
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view->maxncachettl = 7 * 24 * 3600;
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- obj = NULL;
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- result = ns_config_get(maps, "max-stale-ttl", &obj);
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- INSIST(result == ISC_R_SUCCESS);
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- max_stale_ttl = cfg_obj_asuint32(obj);
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-
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obj = NULL;
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result = ns_config_get(maps, "stale-answer-enable", &obj);
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INSIST(result == ISC_R_SUCCESS);
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view->staleanswersenable = cfg_obj_asboolean(obj);
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+ // RHEL-11785 -- set the stale-ttl to non-zero value only if enabled
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+ obj = NULL;
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+ if (view->staleanswersenable) {
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+ result = ns_config_get(maps, "max-stale-ttl", &obj);
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+ INSIST(result == ISC_R_SUCCESS);
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+ max_stale_ttl = cfg_obj_asuint32(obj);
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+ /*
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+ * If 'stale-answer-enable' is false, max_stale_ttl is set
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+ * to 0, meaning keeping stale RRsets in cache is disabled.
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+ */
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+ } else {
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+ /* Do not use default value if stale is disabled,
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+ * but allow manual overriding, like 'stale-cache-enable' */
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+ result = ns_config_get(optionmaps, "max-stale-ttl", &obj);
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+ if (result == ISC_R_SUCCESS)
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+ max_stale_ttl = cfg_obj_asuint32(obj);
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+ }
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+
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result = dns_viewlist_find(&ns_g_server->viewlist, view->name,
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view->rdclass, &pview);
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if (result == ISC_R_SUCCESS) {
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--
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2.41.0
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