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Check opcode of messages returned by dns_request_getresponse

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This commit is contained in:
Mark Andrews 2021-06-11 16:58:15 +10:00
parent 42492890a7
commit ed4e00713f
2 changed files with 81 additions and 0 deletions
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12
bin/nsupdate/nsupdate.c
View file

@ -2445,6 +2445,10 @@ update_completed(isc_task_t *task, isc_event_t *event) {
check_result(result, "dns_request_getresponse");
}
if (answer->opcode != dns_opcode_update) {
fatal("invalid OPCODE in response to UPDATE request");
}
if (answer->rcode != dns_rcode_noerror) {
seenerror = true;
if (!debugging) {
@ -2651,6 +2655,10 @@ recvsoa(isc_task_t *task, isc_event_t *event) {
show_message(stderr, rcvmsg, "Reply from SOA query:");
}
if (rcvmsg->opcode != dns_opcode_query) {
fatal("invalid OPCODE in response to SOA query");
}
if (rcvmsg->rcode != dns_rcode_noerror &&
rcvmsg->rcode != dns_rcode_nxdomain) {
fatal("response to SOA query was unsuccessful");
@ -3124,6 +3132,10 @@ recvgss(isc_task_t *task, isc_event_t *event) {
"recvmsg reply from GSS-TSIG query");
}
if (rcvmsg->opcode != dns_opcode_query) {
fatal("invalid OPCODE in response to GSS-TSIG query");
}
if (rcvmsg->rcode == dns_rcode_formerr && !tried_other_gsstsig) {
ddebug("recvgss trying %s GSS-TSIG",
use_win2k_gsstsig ? "Standard" : "Win2k");

69
lib/dns/zone.c
View file

@ -58,6 +58,7 @@
#include <dns/name.h>
#include <dns/nsec.h>
#include <dns/nsec3.h>
#include <dns/opcode.h>
#include <dns/peer.h>
#include <dns/private.h>
#include <dns/rcode.h>
@ -13181,6 +13182,23 @@ stub_glue_response_cb(isc_task_t *task, isc_event_t *event) {
goto cleanup;
}
/*
* Unexpected opcode.
*/
if (msg->opcode != dns_opcode_query) {
char opcode[128];
isc_buffer_t rb;
isc_buffer_init(&rb, opcode, sizeof(opcode));
(void)dns_opcode_totext(msg->rcode, &rb);
dns_zone_log(zone, ISC_LOG_INFO,
"refreshing stub: "
"unexpected opcode (%.*s) from %s (source %s)",
(int)rb.used, opcode, master, source);
goto cleanup;
}
/*
* Unexpected rcode.
*/
@ -13593,6 +13611,23 @@ stub_callback(isc_task_t *task, isc_event_t *event) {
goto next_master;
}
/*
* Unexpected opcode.
*/
if (msg->opcode != dns_opcode_query) {
char opcode[128];
isc_buffer_t rb;
isc_buffer_init(&rb, opcode, sizeof(opcode));
(void)dns_opcode_totext(msg->rcode, &rb);
dns_zone_log(zone, ISC_LOG_INFO,
"refreshing stub: "
"unexpected opcode (%.*s) from %s (source %s)",
(int)rb.used, opcode, master, source);
goto next_master;
}
/*
* Unexpected rcode.
*/
@ -13982,6 +14017,23 @@ refresh_callback(isc_task_t *task, isc_event_t *event) {
goto next_master;
}
/*
* Unexpected opcode.
*/
if (msg->opcode != dns_opcode_query) {
char opcode[128];
isc_buffer_t rb;
isc_buffer_init(&rb, opcode, sizeof(opcode));
(void)dns_opcode_totext(msg->rcode, &rb);
dns_zone_log(zone, ISC_LOG_INFO,
"refresh: "
"unexpected opcode (%.*s) from %s (source %s)",
(int)rb.used, opcode, master, source);
goto next_master;
}
/*
* Unexpected rcode.
*/
@ -18221,6 +18273,23 @@ forward_callback(isc_task_t *task, isc_event_t *event) {
goto next_master;
}
/*
* Unexpected opcode.
*/
if (msg->opcode != dns_opcode_update) {
char opcode[128];
isc_buffer_t rb;
isc_buffer_init(&rb, opcode, sizeof(opcode));
(void)dns_opcode_totext(msg->rcode, &rb);
dns_zone_log(zone, ISC_LOG_INFO,
"forwarding dynamic update: "
"unexpected opcode (%.*s) from %s",
(int)rb.used, opcode, master);
goto next_master;
}
switch (msg->rcode) {
/*
* Pass these rcodes back to client.