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fix CVE-2024-33655

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(cherry picked from commit f42a34f8e8e328738bf9ad7870678e4d2a004539)
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eaglegai 2024-09-26 07:09:15 +00:00 committed by openeuler-sync-bot
parent f17935f74f
commit 3ce4ec9926
3 changed files with 735 additions and 2 deletions
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@ -0,0 +1,717 @@
From c3206f4568f60c486be6d165b1f2b5b254fea3de Mon Sep 17 00:00:00 2001
From: "W.C.A. Wijngaards" <wouter@nlnetlabs.nl>
Date: Wed, 1 May 2024 10:10:58 +0200
Subject: [PATCH] - Fix for the DNSBomb vulnerability CVE-2024-33655. Thanks to
Xiang Li from the Network and Information Security Lab of Tsinghua
University for reporting it.
debian:https://launchpad.net/ubuntu/+archive/primary/+sourcefiles/unbound/1.13.1-1ubuntu5.5/unbound_1.13.1-1ubuntu5.5.debian.tar.xz
Conflict:NA
Reference:https://github.com/NLnetLabs/unbound/commit/c3206f4568f60c486be6d165b1f2b5b254fea3de
---
doc/Changelog | 5 +
doc/example.conf.in | 15 ++
doc/unbound.conf.5.in | 30 ++++
services/cache/infra.c | 170 +++++++++++++++++-
services/cache/infra.h | 28 +++
services/mesh.c | 65 +++++++
testdata/cachedb_expired_client_timeout.crpl | 1 +
testdata/cachedb_subnet_expired.crpl | 1 +
.../doh_downstream.tdir/doh_downstream.conf | 1 +
.../doh_downstream_notls.conf | 1 +
.../doh_downstream_post.conf | 1 +
.../fwd_three_service.conf | 1 +
testdata/iter_ghost_timewindow.rpl | 1 +
.../ssl_req_order.tdir/ssl_req_order.conf | 1 +
.../tcp_req_order.tdir/tcp_req_order.conf | 1 +
testdata/tcp_sigpipe.tdir/tcp_sigpipe.conf | 3 +-
util/config_file.c | 15 ++
util/config_file.h | 15 ++
util/configlexer.lex | 5 +
util/configparser.y | 55 ++++++
20 files changed, 412 insertions(+), 3 deletions(-)
#diff --git a/doc/Changelog b/doc/Changelog
#index dab04633d..24fbb42c7 100644
#--- a/doc/Changelog
#+++ b/doc/Changelog
#@@ -1,3 +1,8 @@
#+1 May 2024: Wouter
#+ - Fix for the DNSBomb vulnerability CVE-2024-33655. Thanks to Xiang Li
#+ from the Network and Information Security Lab of Tsinghua University
#+ for reporting it.
#+
# 29 April 2024: Yorgos
# - Cleanup unnecessary strdup calls for EDE strings.
#
--- a/doc/example.conf.in
+++ b/doc/example.conf.in
@@ -168,6 +168,15 @@ server:
# are behind a slow satellite link, to eg. 1128.
# unknown-server-time-limit: 376
+ # msec before recursion replies are dropped. The work item continues.
+ # discard-timeout: 1900
+
+ # Max number of replies waiting for recursion per IP address.
+ # wait-limit: 1000
+
+ # Apart from the default, the wait limit can be set for a netblock.
+ # wait-limit-netblock: 192.0.2.0/24 50000
+
# the amount of memory to use for the RRset cache.
# plain value in bytes or you can append k, m or G. default is "4Mb".
# rrset-cache-size: 4m
--- a/doc/unbound.conf.5.in
+++ b/doc/unbound.conf.5.in
@@ -284,6 +284,26 @@ Increase this if you are behind a slow s
That would then avoid re\-querying every initial query because it times out.
Default is 376 msec.
.TP
+.B discard\-timeout: \fI<msec>
+The wait time in msec where recursion requests are dropped. This is
+to stop a large number of replies from accumulating. They receive
+no reply, the work item continues to recurse. It is nice to be a bit
+larger than serve\-expired\-client\-timeout if that is enabled.
+A value of 1900 msec is suggested. The value 0 disables it.
+Default 1900 msec.
+.TP
+.B wait\-limit: \fI<number>
+The number of replies that can wait for recursion, for an IP address.
+This makes a ratelimit per IP address of waiting replies for recursion.
+It stops very large amounts of queries waiting to be returned to one
+destination. The value 0 disables wait limits. Default is 1000.
+.TP
+.B wait\-limit\-netblock: \fI<netblock> <number>
+The wait limit for the netblock. If not given the wait\-limit value is
+used. The most specific netblock is used to determine the limit. Useful for
+overriding the default for a specific, group or individual, server.
+The value -1 disables wait limits for the netblock.
+.TP
.B so\-rcvbuf: \fI<number>
If not 0, then set the SO_RCVBUF socket option to get more buffer
space on UDP port 53 incoming queries. So that short spikes on busy
--- a/services/cache/infra.c
+++ b/services/cache/infra.c
@@ -229,6 +229,69 @@ setup_domain_limits(struct infra_cache*
return 1;
}
+/** find or create element in wait limit netblock tree */
+static struct wait_limit_netblock_info*
+wait_limit_netblock_findcreate(struct infra_cache* infra, char* str)
+{
+ rbtree_type* tree;
+ struct sockaddr_storage addr;
+ int net;
+ socklen_t addrlen;
+ struct wait_limit_netblock_info* d;
+
+ if(!netblockstrtoaddr(str, 0, &addr, &addrlen, &net)) {
+ log_err("cannot parse wait limit netblock '%s'", str);
+ return 0;
+ }
+
+ /* can we find it? */
+ tree = &infra->wait_limits_netblock;
+ d = (struct wait_limit_netblock_info*)addr_tree_find(tree, &addr,
+ addrlen, net);
+ if(d)
+ return d;
+
+ /* create it */
+ d = (struct wait_limit_netblock_info*)calloc(1, sizeof(*d));
+ if(!d)
+ return NULL;
+ d->limit = -1;
+ if(!addr_tree_insert(tree, &d->node, &addr, addrlen, net)) {
+ log_err("duplicate element in domainlimit tree");
+ free(d);
+ return NULL;
+ }
+ return d;
+}
+
+
+/** insert wait limit information into lookup tree */
+static int
+infra_wait_limit_netblock_insert(struct infra_cache* infra,
+ struct config_file* cfg)
+{
+ struct config_str2list* p;
+ struct wait_limit_netblock_info* d;
+ for(p = cfg->wait_limit_netblock; p; p = p->next) {
+ d = wait_limit_netblock_findcreate(infra, p->str);
+ if(!d)
+ return 0;
+ d->limit = atoi(p->str2);
+ }
+ return 1;
+}
+
+/** setup wait limits tree (0 on failure) */
+static int
+setup_wait_limits(struct infra_cache* infra, struct config_file* cfg)
+{
+ addr_tree_init(&infra->wait_limits_netblock);
+ if(!infra_wait_limit_netblock_insert(infra, cfg))
+ return 0;
+ addr_tree_init_parents(&infra->wait_limits_netblock);
+ return 1;
+}
+
struct infra_cache*
infra_create(struct config_file* cfg)
{
@@ -259,6 +322,10 @@ infra_create(struct config_file* cfg)
infra_delete(infra);
return NULL;
}
+ if(!setup_wait_limits(infra, cfg)) {
+ infra_delete(infra);
+ return NULL;
+ }
infra_ip_ratelimit = cfg->ip_ratelimit;
infra->client_ip_rates = slabhash_create(cfg->ip_ratelimit_slabs,
INFRA_HOST_STARTSIZE, cfg->ip_ratelimit_size, &ip_rate_sizefunc,
@@ -279,6 +346,12 @@ static void domain_limit_free(rbnode_typ
}
}
+/** delete wait_limit_netblock_info entries */
+static void wait_limit_netblock_del(rbnode_type* n, void* ATTR_UNUSED(arg))
+{
+ free(n);
+}
+
void
infra_delete(struct infra_cache* infra)
{
@@ -288,6 +361,8 @@ infra_delete(struct infra_cache* infra)
slabhash_delete(infra->domain_rates);
traverse_postorder(&infra->domain_limits, domain_limit_free, NULL);
slabhash_delete(infra->client_ip_rates);
+ traverse_postorder(&infra->wait_limits_netblock,
+ wait_limit_netblock_del, NULL);
free(infra);
}
@@ -873,7 +948,7 @@ static void infra_create_ratedata(struct
/** create rate data item for ip address */
static void infra_ip_create_ratedata(struct infra_cache* infra,
- struct comm_reply* repinfo, time_t timenow)
+ struct comm_reply* repinfo, time_t timenow, int mesh_wait)
{
hashvalue_type h = hash_addr(&(repinfo->addr),
repinfo->addrlen, 0);
@@ -892,6 +967,7 @@ static void infra_ip_create_ratedata(str
k->entry.data = d;
d->qps[0] = 1;
d->timestamp[0] = timenow;
+ d->mesh_wait = mesh_wait;
slabhash_insert(infra->client_ip_rates, h, &k->entry, d, NULL);
}
@@ -1070,6 +1146,74 @@ int infra_ip_ratelimit_inc(struct infra_
}
/* create */
- infra_ip_create_ratedata(infra, repinfo, timenow);
+ infra_ip_create_ratedata(infra, repinfo, timenow, 0);
return 1;
}
+
+int infra_wait_limit_allowed(struct infra_cache* infra, struct comm_reply* rep,
+ struct config_file* cfg)
+{
+ struct lruhash_entry* entry;
+ if(cfg->wait_limit == 0)
+ return 1;
+
+ entry = infra_find_ip_ratedata(infra, rep, 0);
+ if(entry) {
+ rbtree_type* tree;
+ struct wait_limit_netblock_info* w;
+ struct rate_data* d = (struct rate_data*)entry->data;
+ int mesh_wait = d->mesh_wait;
+ lock_rw_unlock(&entry->lock);
+
+ /* have the wait amount, check how much is allowed */
+ tree = &infra->wait_limits_netblock;
+ w = (struct wait_limit_netblock_info*)addr_tree_lookup(tree,
+ &rep->addr, rep->addrlen);
+ if(w) {
+ if(w->limit != -1 && mesh_wait > w->limit)
+ return 0;
+ } else {
+ /* if there is no IP netblock specific information,
+ * use the configured value. */
+ if(mesh_wait > cfg->wait_limit)
+ return 0;
+ }
+ }
+ return 1;
+}
+
+void infra_wait_limit_inc(struct infra_cache* infra, struct comm_reply* rep,
+ time_t timenow, struct config_file* cfg)
+{
+ struct lruhash_entry* entry;
+ if(cfg->wait_limit == 0)
+ return;
+
+ /* Find it */
+ entry = infra_find_ip_ratedata(infra, rep, 1);
+ if(entry) {
+ struct rate_data* d = (struct rate_data*)entry->data;
+ d->mesh_wait++;
+ lock_rw_unlock(&entry->lock);
+ return;
+ }
+
+ /* Create it */
+ infra_ip_create_ratedata(infra, rep, timenow, 1);
+}
+
+void infra_wait_limit_dec(struct infra_cache* infra, struct comm_reply* rep,
+ struct config_file* cfg)
+{
+ struct lruhash_entry* entry;
+ if(cfg->wait_limit == 0)
+ return;
+
+ entry = infra_find_ip_ratedata(infra, rep, 1);
+ if(entry) {
+ struct rate_data* d = (struct rate_data*)entry->data;
+ if(d->mesh_wait > 0)
+ d->mesh_wait--;
+ lock_rw_unlock(&entry->lock);
+ }
+}
--- a/services/cache/infra.h
+++ b/services/cache/infra.h
@@ -122,6 +122,8 @@ struct infra_cache {
rbtree_type domain_limits;
/** hash table with query rates per client ip: ip_rate_key, ip_rate_data */
struct slabhash* client_ip_rates;
+ /** tree of addr_tree_node, with wait_limit_netblock_info information */
+ rbtree_type wait_limits_netblock;
};
/** ratelimit, unless overridden by domain_limits, 0 is off */
@@ -182,10 +184,22 @@ struct rate_data {
/** what the timestamp is of the qps array members, counter is
* valid for that timestamp. Usually now and now-1. */
time_t timestamp[RATE_WINDOW];
+ /** the number of queries waiting in the mesh */
+ int mesh_wait;
};
#define ip_rate_data rate_data
+/**
+ * Data to store the configuration per netblock for the wait limit
+ */
+struct wait_limit_netblock_info {
+ /** The addr tree node, this must be first. */
+ struct addr_tree_node node;
+ /** the limit on the amount */
+ int limit;
+};
+
/** infra host cache default hash lookup size */
#define INFRA_HOST_STARTSIZE 32
/** bytes per zonename reserved in the hostcache, dnamelen(zonename.com.) */
@@ -466,4 +480,16 @@ void ip_rate_delkeyfunc(void* d, void* a
/* delete data */
#define ip_rate_deldatafunc rate_deldatafunc
+/** See if the IP address can have another reply in the wait limit */
+int infra_wait_limit_allowed(struct infra_cache* infra, struct comm_reply* rep,
+ struct config_file* cfg);
+
+/** Increment number of waiting replies for IP */
+void infra_wait_limit_inc(struct infra_cache* infra, struct comm_reply* rep,
+ time_t timenow, struct config_file* cfg);
+
+/** Decrement number of waiting replies for IP */
+void infra_wait_limit_dec(struct infra_cache* infra, struct comm_reply* rep,
+ struct config_file* cfg);
+
#endif /* SERVICES_CACHE_INFRA_H */
--- a/services/mesh.c
+++ b/services/mesh.c
@@ -47,6 +47,7 @@
#include "services/outbound_list.h"
#include "services/cache/dns.h"
#include "services/cache/rrset.h"
+#include "services/cache/infra.h"
#include "util/log.h"
#include "util/net_help.h"
#include "util/module.h"
@@ -465,6 +466,14 @@ void mesh_new_client(struct mesh_area* m
if(rep->c->tcp_req_info) {
r_buffer = rep->c->tcp_req_info->spool_buffer;
}
+ if(!infra_wait_limit_allowed(mesh->env->infra_cache, rep,
+ mesh->env->cfg)) {
+ verbose(VERB_ALGO, "Too many queries waiting from the IP. "
+ "dropping incoming query.");
+ comm_point_drop_reply(rep);
+ mesh->stats_dropped++;
+ return;
+ }
if(!unique)
s = mesh_area_find(mesh, cinfo, qinfo, qflags&(BIT_RD|BIT_CD), 0, 0);
/* does this create a new reply state? */
@@ -559,6 +568,8 @@ void mesh_new_client(struct mesh_area* m
log_err("mesh_new_client: out of memory initializing serve expired");
goto servfail_mem;
}
+ infra_wait_limit_inc(mesh->env->infra_cache, rep, *mesh->env->now,
+ mesh->env->cfg);
/* update statistics */
if(was_detached) {
log_assert(mesh->num_detached_states > 0);
@@ -883,6 +894,8 @@ mesh_state_cleanup(struct mesh_state* ms
* takes no time and also it does not do the mesh accounting */
mstate->reply_list = NULL;
for(; rep; rep=rep->next) {
+ infra_wait_limit_dec(mesh->env->infra_cache,
+ &rep->query_reply, mesh->env->cfg);
comm_point_drop_reply(&rep->query_reply);
log_assert(mesh->num_reply_addrs > 0);
mesh->num_reply_addrs--;
@@ -1300,6 +1313,8 @@ mesh_send_reply(struct mesh_state* m, in
comm_point_send_reply(&r->query_reply);
m->reply_list = rlist;
}
+ infra_wait_limit_dec(m->s.env->infra_cache, &r->query_reply,
+ m->s.env->cfg);
/* account */
log_assert(m->s.env->mesh->num_reply_addrs > 0);
m->s.env->mesh->num_reply_addrs--;
@@ -1353,6 +1368,28 @@ void mesh_query_done(struct mesh_state*
}
}
for(r = mstate->reply_list; r; r = r->next) {
+ struct timeval old;
+ timeval_subtract(&old, mstate->s.env->now_tv, &r->start_time);
+ if(mstate->s.env->cfg->discard_timeout != 0 &&
+ ((int)old.tv_sec)*1000+((int)old.tv_usec)/1000 >
+ mstate->s.env->cfg->discard_timeout) {
+ /* Drop the reply, it is too old */
+ /* briefly set the reply_list to NULL, so that the
+ * tcp req info cleanup routine that calls the mesh
+ * to deregister the meshstate for it is not done
+ * because the list is NULL and also accounting is not
+ * done there, but instead we do that here. */
+ struct mesh_reply* reply_list = mstate->reply_list;
+ verbose(VERB_ALGO, "drop reply, it is older than discard-timeout");
+ infra_wait_limit_dec(mstate->s.env->infra_cache,
+ &r->query_reply, mstate->s.env->cfg);
+ mstate->reply_list = NULL;
+ comm_point_drop_reply(&r->query_reply);
+ mstate->reply_list = reply_list;
+ mstate->s.env->mesh->stats_dropped++;
+ continue;
+ }
+
tv = r->start_time;
/* if a response-ip address block has been stored the
@@ -1384,6 +1421,8 @@ void mesh_query_done(struct mesh_state*
* because the list is NULL and also accounting is not
* done there, but instead we do that here. */
struct mesh_reply* reply_list = mstate->reply_list;
+ infra_wait_limit_dec(mstate->s.env->infra_cache,
+ &r->query_reply, mstate->s.env->cfg);
mstate->reply_list = NULL;
comm_point_drop_reply(&r->query_reply);
mstate->reply_list = reply_list;
@@ -1858,6 +1897,8 @@ void mesh_state_remove_reply(struct mesh
/* delete it, but allocated in m region */
log_assert(mesh->num_reply_addrs > 0);
mesh->num_reply_addrs--;
+ infra_wait_limit_dec(mesh->env->infra_cache,
+ &n->query_reply, mesh->env->cfg);
/* prev = prev; */
n = n->next;
@@ -1997,6 +2038,28 @@ mesh_serve_expired_callback(void* arg)
log_dns_msg("Serve expired lookup", &qstate->qinfo, msg->rep);
for(r = mstate->reply_list; r; r = r->next) {
+ struct timeval old;
+ timeval_subtract(&old, mstate->s.env->now_tv, &r->start_time);
+ if(mstate->s.env->cfg->discard_timeout != 0 &&
+ ((int)old.tv_sec)*1000+((int)old.tv_usec)/1000 >
+ mstate->s.env->cfg->discard_timeout) {
+ /* Drop the reply, it is too old */
+ /* briefly set the reply_list to NULL, so that the
+ * tcp req info cleanup routine that calls the mesh
+ * to deregister the meshstate for it is not done
+ * because the list is NULL and also accounting is not
+ * done there, but instead we do that here. */
+ struct mesh_reply* reply_list = mstate->reply_list;
+ verbose(VERB_ALGO, "drop reply, it is older than discard-timeout");
+ infra_wait_limit_dec(mstate->s.env->infra_cache,
+ &r->query_reply, mstate->s.env->cfg);
+ mstate->reply_list = NULL;
+ comm_point_drop_reply(&r->query_reply);
+ mstate->reply_list = reply_list;
+ mstate->s.env->mesh->stats_dropped++;
+ continue;
+ }
+
tv = r->start_time;
/* If address info is returned, it means the action should be an
@@ -2024,6 +2087,8 @@ mesh_serve_expired_callback(void* arg)
r, r_buffer, prev, prev_buffer);
if(r->query_reply.c->tcp_req_info)
tcp_req_info_remove_mesh_state(r->query_reply.c->tcp_req_info, mstate);
+ infra_wait_limit_dec(mstate->s.env->infra_cache,
+ &r->query_reply, mstate->s.env->cfg);
prev = r;
prev_buffer = r_buffer;
--- a/testdata/doh_downstream.tdir/doh_downstream.conf
+++ b/testdata/doh_downstream.tdir/doh_downstream.conf
@@ -11,6 +11,7 @@ server:
chroot: ""
username: ""
do-not-query-localhost: no
+ discard-timeout: 3000 # testns uses sleep=2
http-query-buffer-size: 1G
http-response-buffer-size: 1G
http-max-streams: 200
--- a/testdata/doh_downstream_notls.tdir/doh_downstream_notls.conf
+++ b/testdata/doh_downstream_notls.tdir/doh_downstream_notls.conf
@@ -11,6 +11,7 @@ server:
chroot: ""
username: ""
do-not-query-localhost: no
+ discard-timeout: 3000 # testns uses sleep=2
http-query-buffer-size: 1G
http-response-buffer-size: 1G
http-max-streams: 200
--- a/testdata/doh_downstream_post.tdir/doh_downstream_post.conf
+++ b/testdata/doh_downstream_post.tdir/doh_downstream_post.conf
@@ -11,6 +11,7 @@ server:
chroot: ""
username: ""
do-not-query-localhost: no
+ discard-timeout: 3000 # testns uses sleep=2
http-query-buffer-size: 1G
http-response-buffer-size: 1G
http-max-streams: 200
--- a/testdata/fwd_three_service.tdir/fwd_three_service.conf
+++ b/testdata/fwd_three_service.tdir/fwd_three_service.conf
@@ -11,6 +11,7 @@ server:
num-queries-per-thread: 1024
use-syslog: no
do-not-query-localhost: no
+ discard-timeout: 3000 # testns uses sleep=2
forward-zone:
name: "."
forward-addr: "127.0.0.1@@TOPORT@"
--- a/testdata/ssl_req_order.tdir/ssl_req_order.conf
+++ b/testdata/ssl_req_order.tdir/ssl_req_order.conf
@@ -9,6 +9,7 @@ server:
chroot: ""
username: ""
do-not-query-localhost: no
+ discard-timeout: 3000 # testns uses sleep=2
ssl-port: @PORT@
ssl-service-key: "unbound_server.key"
ssl-service-pem: "unbound_server.pem"
--- a/testdata/tcp_req_order.tdir/tcp_req_order.conf
+++ b/testdata/tcp_req_order.tdir/tcp_req_order.conf
@@ -9,6 +9,7 @@ server:
chroot: ""
username: ""
do-not-query-localhost: no
+ discard-timeout: 3000 # testns uses sleep=2
local-zone: "example.net" static
local-data: "www1.example.net. IN A 1.2.3.1"
--- a/testdata/tcp_sigpipe.tdir/tcp_sigpipe.conf
+++ b/testdata/tcp_sigpipe.tdir/tcp_sigpipe.conf
@@ -1,5 +1,5 @@
server:
- verbosity: 2
+ verbosity: 4
# num-threads: 1
interface: 127.0.0.1
port: @PORT@
@@ -9,6 +9,7 @@ server:
chroot: ""
username: ""
do-not-query-localhost: no
+ discard-timeout: 3000 # testns uses sleep=2
forward-zone:
name: "."
--- a/util/config_file.c
+++ b/util/config_file.c
@@ -289,6 +289,11 @@ config_create(void)
cfg->minimal_responses = 1;
cfg->rrset_roundrobin = 1;
cfg->unknown_server_time_limit = 376;
+ cfg->discard_timeout = 1900; /* msec */
+ cfg->wait_limit = 1000;
+ cfg->wait_limit_cookie = 10000;
+ cfg->wait_limit_netblock = NULL;
+ cfg->wait_limit_cookie_netblock = NULL;
cfg->max_udp_size = 4096;
if(!(cfg->server_key_file = strdup(RUN_DIR"/unbound_server.key")))
goto error_exit;
@@ -661,6 +666,9 @@ int config_set_option(struct config_file
else S_YNO("minimal-responses:", minimal_responses)
else S_YNO("rrset-roundrobin:", rrset_roundrobin)
else S_NUMBER_OR_ZERO("unknown-server-time-limit:", unknown_server_time_limit)
+ else S_NUMBER_OR_ZERO("discard-timeout:", discard_timeout)
+ else S_NUMBER_OR_ZERO("wait-limit:", wait_limit)
+ else S_NUMBER_OR_ZERO("wait-limit-cookie:", wait_limit_cookie)
else S_STRLIST("local-data:", local_data)
else S_YNO("unblock-lan-zones:", unblock_lan_zones)
else S_YNO("insecure-lan-zones:", insecure_lan_zones)
@@ -1101,6 +1109,11 @@ config_get_option(struct config_file* cf
else O_YNO(opt, "minimal-responses", minimal_responses)
else O_YNO(opt, "rrset-roundrobin", rrset_roundrobin)
else O_DEC(opt, "unknown-server-time-limit", unknown_server_time_limit)
+ else O_DEC(opt, "discard-timeout", discard_timeout)
+ else O_DEC(opt, "wait-limit", wait_limit)
+ else O_DEC(opt, "wait-limit-cookie", wait_limit_cookie)
+ else O_LS2(opt, "wait-limit-netblock", wait_limit_netblock)
+ else O_LS2(opt, "wait-limit-cookie-netblock", wait_limit_cookie_netblock)
#ifdef CLIENT_SUBNET
else O_LST(opt, "send-client-subnet", client_subnet)
else O_LST(opt, "client-subnet-zone", client_subnet_zone)
@@ -1545,6 +1558,8 @@ config_delete(struct config_file* cfg)
config_deltrplstrlist(cfg->acl_tag_actions);
config_deltrplstrlist(cfg->acl_tag_datas);
config_delstrlist(cfg->control_ifs.first);
+ config_deldblstrlist(cfg->wait_limit_netblock);
+ config_deldblstrlist(cfg->wait_limit_cookie_netblock);
free(cfg->server_key_file);
free(cfg->server_cert_file);
free(cfg->control_key_file);
--- a/util/config_file.h
+++ b/util/config_file.h
@@ -489,6 +489,21 @@ struct config_file {
/* wait time for unknown server in msec */
int unknown_server_time_limit;
+ /** Wait time to drop recursion replies */
+ int discard_timeout;
+
+ /** Wait limit for number of replies per IP address */
+ int wait_limit;
+
+ /** Wait limit for number of replies per IP address with cookie */
+ int wait_limit_cookie;
+
+ /** wait limit per netblock */
+ struct config_str2list* wait_limit_netblock;
+
+ /** wait limit with cookie per netblock */
+ struct config_str2list* wait_limit_cookie_netblock;
+
/* maximum UDP response size */
size_t max_udp_size;
--- a/util/configlexer.lex
+++ b/util/configlexer.lex
@@ -440,6 +440,11 @@ domain-insecure{COLON} { YDVAR(1, VAR_D
minimal-responses{COLON} { YDVAR(1, VAR_MINIMAL_RESPONSES) }
rrset-roundrobin{COLON} { YDVAR(1, VAR_RRSET_ROUNDROBIN) }
unknown-server-time-limit{COLON} { YDVAR(1, VAR_UNKNOWN_SERVER_TIME_LIMIT) }
+discard-timeout{COLON} { YDVAR(1, VAR_DISCARD_TIMEOUT) }
+wait-limit{COLON} { YDVAR(1, VAR_WAIT_LIMIT) }
+wait-limit-cookie{COLON} { YDVAR(1, VAR_WAIT_LIMIT_COOKIE) }
+wait-limit-netblock{COLON} { YDVAR(1, VAR_WAIT_LIMIT_NETBLOCK) }
+wait-limit-cookie-netblock{COLON} { YDVAR(1, VAR_WAIT_LIMIT_COOKIE_NETBLOCK) }
max-udp-size{COLON} { YDVAR(1, VAR_MAX_UDP_SIZE) }
dns64-prefix{COLON} { YDVAR(1, VAR_DNS64_PREFIX) }
dns64-synthall{COLON} { YDVAR(1, VAR_DNS64_SYNTHALL) }
--- a/util/configparser.y
+++ b/util/configparser.y
@@ -176,6 +176,8 @@ extern struct config_parser_state* cfg_p
%token VAR_ALLOW_NOTIFY VAR_TLS_WIN_CERT VAR_TCP_CONNECTION_LIMIT
%token VAR_FORWARD_NO_CACHE VAR_STUB_NO_CACHE VAR_LOG_SERVFAIL VAR_DENY_ANY
%token VAR_UNKNOWN_SERVER_TIME_LIMIT VAR_LOG_TAG_QUERYREPLY
+%token VAR_DISCARD_TIMEOUT VAR_WAIT_LIMIT VAR_WAIT_LIMIT_COOKIE
+%token VAR_WAIT_LIMIT_NETBLOCK VAR_WAIT_LIMIT_COOKIE_NETBLOCK
%token VAR_STREAM_WAIT_SIZE VAR_TLS_CIPHERS VAR_TLS_CIPHERSUITES VAR_TLS_USE_SNI
%token VAR_IPSET VAR_IPSET_NAME_V4 VAR_IPSET_NAME_V6
%token VAR_TLS_SESSION_TICKET_KEYS VAR_RPZ VAR_TAGS VAR_RPZ_ACTION_OVERRIDE
@@ -296,6 +298,8 @@ content_server: server_num_threads | ser
server_fast_server_permil | server_fast_server_num | server_tls_win_cert |
server_tcp_connection_limit | server_log_servfail | server_deny_any |
server_unknown_server_time_limit | server_log_tag_queryreply |
+ server_discard_timeout | server_wait_limit | server_wait_limit_cookie |
+ server_wait_limit_netblock | server_wait_limit_cookie_netblock |
server_stream_wait_size | server_tls_ciphers |
server_tls_ciphersuites | server_tls_session_ticket_keys |
server_tls_use_sni | server_edns_client_string |
@@ -2145,6 +2149,57 @@ server_unknown_server_time_limit: VAR_UN
free($2);
}
;
+server_discard_timeout: VAR_DISCARD_TIMEOUT STRING_ARG
+ {
+ OUTYY(("P(server_discard_timeout:%s)\n", $2));
+ cfg_parser->cfg->discard_timeout = atoi($2);
+ free($2);
+ }
+ ;
+server_wait_limit: VAR_WAIT_LIMIT STRING_ARG
+ {
+ OUTYY(("P(server_wait_limit:%s)\n", $2));
+ cfg_parser->cfg->wait_limit = atoi($2);
+ free($2);
+ }
+ ;
+server_wait_limit_cookie: VAR_WAIT_LIMIT_COOKIE STRING_ARG
+ {
+ OUTYY(("P(server_wait_limit_cookie:%s)\n", $2));
+ cfg_parser->cfg->wait_limit_cookie = atoi($2);
+ free($2);
+ }
+ ;
+server_wait_limit_netblock: VAR_WAIT_LIMIT_NETBLOCK STRING_ARG STRING_ARG
+ {
+ OUTYY(("P(server_wait_limit_netblock:%s %s)\n", $2, $3));
+ if(atoi($3) == 0 && strcmp($3, "0") != 0) {
+ yyerror("number expected");
+ free($2);
+ free($3);
+ } else {
+ if(!cfg_str2list_insert(&cfg_parser->cfg->
+ wait_limit_netblock, $2, $3))
+ fatal_exit("out of memory adding "
+ "wait-limit-netblock");
+ }
+ }
+ ;
+server_wait_limit_cookie_netblock: VAR_WAIT_LIMIT_COOKIE_NETBLOCK STRING_ARG STRING_ARG
+ {
+ OUTYY(("P(server_wait_limit_cookie_netblock:%s %s)\n", $2, $3));
+ if(atoi($3) == 0 && strcmp($3, "0") != 0) {
+ yyerror("number expected");
+ free($2);
+ free($3);
+ } else {
+ if(!cfg_str2list_insert(&cfg_parser->cfg->
+ wait_limit_cookie_netblock, $2, $3))
+ fatal_exit("out of memory adding "
+ "wait-limit-cookie-netblock");
+ }
+ }
+ ;
server_max_udp_size: VAR_MAX_UDP_SIZE STRING_ARG
{
OUTYY(("P(server_max_udp_size:%s)\n", $2));

9
unbound.conf
View File

@ -166,6 +166,15 @@ server:
# msec to wait before close of port on timeout UDP. 0 disables.
# delay-close: 0
# msec before recursion replies are dropped. The work item continues.
# discard-timeout: 1900
# Max number of replies waiting for recursion per IP address.
# wait-limit: 1000
# Apart from the default, the wait limit can be set for a netblock.
# wait-limit-netblock: 192.0.2.0/24 50000
# the amount of memory to use for the RRset cache.
# plain value in bytes or you can append k, m or G. default is "4Mb".
# rrset-cache-size: 4m

11
unbound.spec
View File

@ -2,7 +2,7 @@
Name: unbound
Version: 1.13.2
Release: 14
Release: 15
Summary: Unbound is a validating, recursive, caching DNS resolver
License: BSD
Url: https://nlnetlabs.nl/projects/unbound/about/
@ -33,10 +33,11 @@ Patch8: backport-001-CVE-2024-43168.patch
Patch9: backport-002-CVE-2024-43168.patch
Patch10: backport-003-CVE-2024-43168.patch
Patch11: backport-004-CVE-2024-43168.patch
Patch12: backport-CVE-2024-33655.patch
BuildRequires: make flex swig pkgconfig systemd
BuildRequires: libevent-devel expat-devel openssl-devel python3-devel
BuildRequires: gcc
BuildRequires: gcc byacc
%{?systemd_requires}
Requires: %{name}-libs = %{version}-%{release}
@ -257,6 +258,12 @@ popd
%{_mandir}/man*
%changelog
* Thu Sep 26 2024 gaihuiying <eaglegai@163.com> - 1.13.2-15
- Type:CVE
- CVE:CVE-2024-33655
- SUG:NA
- DESC:fix CVE-2024-33655
* Mon Aug 26 2024 gaihuiying <eaglegai@163.com> - 1.13.2-14
- Type:cves
- CVE:CVE-2024-43168