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e07df0 |
From c3314d0fa0756d39cab1e9d9e3cf2e36dd6273da Mon Sep 17 00:00:00 2001
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e07df0 |
From: Petr Mensik <pemensik@redhat.com>
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e07df0 |
Date: Mon, 18 Nov 2019 16:44:58 +0100
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e07df0 |
Subject: [PATCH] Limit number of queries per TCP connection
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e07df0 |
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e07df0 |
5306. [security] Set a limit on the number of concurrently served
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e07df0 |
pipelined TCP queries. (CVE-2019-6477) [GL #1264]
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e07df0 |
---
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e07df0 |
bin/named/client.c | 73 ++++++++++++++++++++------------
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e07df0 |
bin/named/include/named/client.h | 5 ++-
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e07df0 |
2 files changed, 50 insertions(+), 28 deletions(-)
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e07df0 |
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e07df0 |
diff --git a/bin/named/client.c b/bin/named/client.c
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e07df0 |
index f21a77ba52..23f70edaff 100644
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e07df0 |
--- a/bin/named/client.c
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e07df0 |
+++ b/bin/named/client.c
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e07df0 |
@@ -98,7 +98,15 @@
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e07df0 |
#define SEND_BUFFER_SIZE 4096
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e07df0 |
#define RECV_BUFFER_SIZE 4096
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e07df0 |
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e07df0 |
+#define TCP_CLIENTS_PER_CONN 23
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e07df0 |
+/*%<
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e07df0 |
+ * Number of simultaneous ns_clients_t (queries in flight) for one
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e07df0 |
+ * TCP connection. The number was arbitrarily picked and might be
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e07df0 |
+ * changed in the future.
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e07df0 |
+ */
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e07df0 |
+
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e07df0 |
#ifdef ISC_PLATFORM_USETHREADS
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e07df0 |
+
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e07df0 |
#define NMCTXS 100
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e07df0 |
/*%<
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e07df0 |
* Number of 'mctx pools' for clients. (Should this be configurable?)
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e07df0 |
@@ -333,7 +341,7 @@ tcpconn_init(ns_client_t *client, isc_boolean_t force) {
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e07df0 |
*/
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e07df0 |
tconn = isc_mem_allocate(ns_g_mctx, sizeof(*tconn));
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e07df0 |
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e07df0 |
- isc_refcount_init(&tconn->refs, 1);
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e07df0 |
+ isc_refcount_init(&tconn->clients, 1); /* Current client */
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e07df0 |
tconn->tcpquota = quota;
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e07df0 |
quota = NULL;
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e07df0 |
tconn->pipelined = ISC_FALSE;
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e07df0 |
@@ -350,14 +358,14 @@ tcpconn_init(ns_client_t *client, isc_boolean_t force) {
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e07df0 |
*/
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e07df0 |
static void
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e07df0 |
tcpconn_attach(ns_client_t *source, ns_client_t *target) {
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e07df0 |
- int refs;
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e07df0 |
+ int old_clients;
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e07df0 |
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e07df0 |
REQUIRE(source->tcpconn != NULL);
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e07df0 |
REQUIRE(target->tcpconn == NULL);
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e07df0 |
REQUIRE(source->tcpconn->pipelined);
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e07df0 |
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e07df0 |
- isc_refcount_increment(&source->tcpconn->refs, &refs);
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e07df0 |
- INSIST(refs > 1);
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e07df0 |
+ isc_refcount_increment(&source->tcpconn->clients, &old_clients);
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e07df0 |
+ INSIST(old_clients > 1);
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e07df0 |
target->tcpconn = source->tcpconn;
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e07df0 |
}
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e07df0 |
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e07df0 |
@@ -370,15 +378,15 @@ tcpconn_attach(ns_client_t *source, ns_client_t *target) {
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e07df0 |
static void
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e07df0 |
tcpconn_detach(ns_client_t *client) {
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e07df0 |
ns_tcpconn_t *tconn = NULL;
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e07df0 |
- int refs;
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e07df0 |
+ int old_clients;
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e07df0 |
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e07df0 |
REQUIRE(client->tcpconn != NULL);
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e07df0 |
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e07df0 |
tconn = client->tcpconn;
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e07df0 |
client->tcpconn = NULL;
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e07df0 |
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e07df0 |
- isc_refcount_decrement(&tconn->refs, &refs);
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e07df0 |
- if (refs == 0) {
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e07df0 |
+ isc_refcount_decrement(&tconn->clients, &old_clients);
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e07df0 |
+ if (old_clients == 0) {
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e07df0 |
isc_quota_detach(&tconn->tcpquota);
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e07df0 |
isc_mem_free(ns_g_mctx, tconn);
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e07df0 |
}
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e07df0 |
@@ -2629,28 +2637,39 @@ client_request(isc_task_t *task, isc_event_t *event) {
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e07df0 |
/*
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e07df0 |
* Pipeline TCP query processing.
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e07df0 |
*/
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e07df0 |
- if (TCP_CLIENT(client) &&
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e07df0 |
- client->message->opcode != dns_opcode_query)
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e07df0 |
- {
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e07df0 |
- client->tcpconn->pipelined = ISC_FALSE;
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e07df0 |
- }
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e07df0 |
- if (TCP_CLIENT(client) && client->tcpconn->pipelined) {
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e07df0 |
- /*
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e07df0 |
- * We're pipelining. Replace the client; the
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e07df0 |
- * replacement can read the TCP socket looking
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e07df0 |
- * for new messages and this one can process the
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e07df0 |
- * current message asynchronously.
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e07df0 |
- *
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e07df0 |
- * There will now be at least three clients using this
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e07df0 |
- * TCP socket - one accepting new connections,
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e07df0 |
- * one reading an existing connection to get new
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e07df0 |
- * messages, and one answering the message already
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e07df0 |
- * received.
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e07df0 |
- */
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e07df0 |
- result = ns_client_replace(client);
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e07df0 |
- if (result != ISC_R_SUCCESS) {
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e07df0 |
+ if (TCP_CLIENT(client)) {
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e07df0 |
+ if (client->message->opcode != dns_opcode_query) {
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e07df0 |
client->tcpconn->pipelined = ISC_FALSE;
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e07df0 |
}
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e07df0 |
+
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e07df0 |
+ /*
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e07df0 |
+ * Limit the maximum number of simultaneous pipelined
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e07df0 |
+ * queries on TCP connection to TCP_CLIENTS_PER_CONN.
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e07df0 |
+ */
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e07df0 |
+ if ((isc_refcount_current(&client->tcpconn->clients)
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e07df0 |
+ > TCP_CLIENTS_PER_CONN))
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e07df0 |
+ {
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e07df0 |
+ client->tcpconn->pipelined = ISC_FALSE;
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e07df0 |
+ }
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e07df0 |
+
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e07df0 |
+ if (client->tcpconn->pipelined) {
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e07df0 |
+ /*
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e07df0 |
+ * We're pipelining. Replace the client; the
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e07df0 |
+ * replacement can read the TCP socket looking
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e07df0 |
+ * for new messages and this one can process the
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e07df0 |
+ * current message asynchronously.
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e07df0 |
+ *
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e07df0 |
+ * There will now be at least three clients using this
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e07df0 |
+ * TCP socket - one accepting new connections,
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e07df0 |
+ * one reading an existing connection to get new
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e07df0 |
+ * messages, and one answering the message already
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e07df0 |
+ * received.
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e07df0 |
+ */
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e07df0 |
+ result = ns_client_replace(client);
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e07df0 |
+ if (result != ISC_R_SUCCESS) {
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e07df0 |
+ client->tcpconn->pipelined = ISC_FALSE;
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e07df0 |
+ }
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e07df0 |
+ }
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e07df0 |
}
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e07df0 |
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e07df0 |
dns_opcodestats_increment(ns_g_server->opcodestats,
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e07df0 |
diff --git a/bin/named/include/named/client.h b/bin/named/include/named/client.h
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e07df0 |
index 0f54d2267b..86437ade22 100644
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e07df0 |
--- a/bin/named/include/named/client.h
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e07df0 |
+++ b/bin/named/include/named/client.h
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e07df0 |
@@ -77,7 +77,10 @@
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e07df0 |
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e07df0 |
/*% reference-counted TCP connection object */
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e07df0 |
typedef struct ns_tcpconn {
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e07df0 |
- isc_refcount_t refs;
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e07df0 |
+ isc_refcount_t clients; /* Number of clients using
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e07df0 |
+ * this connection. Conn can
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e07df0 |
+ * be freed if goes to 0
|
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e07df0 |
+ */
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e07df0 |
isc_quota_t *tcpquota;
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e07df0 |
isc_boolean_t pipelined;
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e07df0 |
} ns_tcpconn_t;
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e07df0 |
--
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e07df0 |
2.20.1
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e07df0 |
|