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Check zero length topics and topic filters #3135

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Check zero length topics and topic filters #3135

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30c9cdc
Check zero length topics and topic filters closes #2908
ckrey Oct 12, 2024
b9da09e
Add test cases for bridges with empty prefixes #2908
ckrey Oct 12, 2024
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8 changes: 4 additions & 4 deletions lib/util_topic.c
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Original file line number Diff line number Diff line change
Expand Up @@ -70,7 +70,7 @@ int mosquitto_pub_topic_check(const char *str)
len++;
str = &str[1];
}
if(len > 65535) return MOSQ_ERR_INVAL;
if(len == 0 || len > 65535) return MOSQ_ERR_INVAL;
#ifdef WITH_BROKER
if(hier_count > TOPIC_HIERARCHY_LIMIT) return MOSQ_ERR_INVAL;
#endif
Expand All @@ -85,7 +85,7 @@ int mosquitto_pub_topic_check2(const char *str, size_t len)
int hier_count = 0;
#endif

if(str == NULL || len > 65535){
if(str == NULL || len == 0 || len > 65535){
return MOSQ_ERR_INVAL;
}

Expand Down Expand Up @@ -144,7 +144,7 @@ int mosquitto_sub_topic_check(const char *str)
c = str[0];
str = &str[1];
}
if(len > 65535) return MOSQ_ERR_INVAL;
if(len == 0 || len > 65535) return MOSQ_ERR_INVAL;
#ifdef WITH_BROKER
if(hier_count > TOPIC_HIERARCHY_LIMIT) return MOSQ_ERR_INVAL;
#endif
Expand All @@ -160,7 +160,7 @@ int mosquitto_sub_topic_check2(const char *str, size_t len)
int hier_count = 0;
#endif

if(str == NULL || len > 65535){
if(str == NULL || len == 0 || len > 65535){
return MOSQ_ERR_INVAL;
}

Expand Down
8 changes: 5 additions & 3 deletions src/bridge_topic.c
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Original file line number Diff line number Diff line change
Expand Up @@ -59,9 +59,11 @@ static int bridge__create_prefix(char **full_prefix, const char *topic, const ch
{
size_t len;

if(mosquitto_pub_topic_check(prefix) != MOSQ_ERR_SUCCESS){
log__printf(NULL, MOSQ_LOG_ERR, "Error: Invalid bridge topic local prefix '%s'.", prefix);
return MOSQ_ERR_INVAL;
if(!prefix || strlen(prefix) != 0){
if(mosquitto_pub_topic_check(prefix) != MOSQ_ERR_SUCCESS){
log__printf(NULL, MOSQ_LOG_ERR, "Error: Invalid bridge topic local prefix '%s'.", prefix);
return MOSQ_ERR_INVAL;
}
}

if(topic){
Expand Down
199 changes: 100 additions & 99 deletions src/handle_subscribe.c
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Original file line number Diff line number Diff line change
Expand Up @@ -100,131 +100,132 @@ int handle__subscribe(struct mosquitto *context)
return MOSQ_ERR_MALFORMED_PACKET;
}

if(sub){
if(!slen){
log__printf(NULL, MOSQ_LOG_INFO,
"Empty subscription string from %s, disconnecting.",
context->address);
mosquitto__free(sub);
mosquitto__free(payload);
return MOSQ_ERR_MALFORMED_PACKET;
}
if(mosquitto_sub_topic_check(sub)){
log__printf(NULL, MOSQ_LOG_INFO,
"Invalid subscription string from %s, disconnecting.",
context->address);
mosquitto__free(sub);
mosquitto__free(payload);
return MOSQ_ERR_MALFORMED_PACKET;
if(!slen){
log__printf(NULL, MOSQ_LOG_INFO,
"Empty subscription string from %s, disconnecting.",
context->address);
mosquitto__free(sub);
mosquitto__free(payload);
return MOSQ_ERR_MALFORMED_PACKET;
}
if(mosquitto_sub_topic_check(sub)){
log__printf(NULL, MOSQ_LOG_INFO,
"Invalid subscription string from %s, disconnecting.",
context->address);
mosquitto__free(sub);
mosquitto__free(payload);
return MOSQ_ERR_MALFORMED_PACKET;
}

if(packet__read_byte(&context->in_packet, &subscription_options)){
mosquitto__free(sub);
mosquitto__free(payload);
return MOSQ_ERR_MALFORMED_PACKET;
}
if(context->protocol == mosq_p_mqtt31 || context->protocol == mosq_p_mqtt311){
qos = subscription_options;
if(context->is_bridge){
subscription_options = MQTT_SUB_OPT_RETAIN_AS_PUBLISHED | MQTT_SUB_OPT_NO_LOCAL;
}
}else{
qos = subscription_options & 0x03;
subscription_options &= 0xFC;

if(packet__read_byte(&context->in_packet, &subscription_options)){
retain_handling = (subscription_options & 0x30);
if(retain_handling == 0x30 || (subscription_options & 0xC0) != 0){
mosquitto__free(sub);
mosquitto__free(payload);
return MOSQ_ERR_MALFORMED_PACKET;
}
if(context->protocol == mosq_p_mqtt31 || context->protocol == mosq_p_mqtt311){
qos = subscription_options;
if(context->is_bridge){
subscription_options = MQTT_SUB_OPT_RETAIN_AS_PUBLISHED | MQTT_SUB_OPT_NO_LOCAL;
}
}else{
qos = subscription_options & 0x03;
subscription_options &= 0xFC;

retain_handling = (subscription_options & 0x30);
if(retain_handling == 0x30 || (subscription_options & 0xC0) != 0){
mosquitto__free(sub);
mosquitto__free(payload);
return MOSQ_ERR_MALFORMED_PACKET;
}
}
if(qos > 2){
log__printf(NULL, MOSQ_LOG_INFO,
"Invalid QoS in subscription command from %s, disconnecting.",
context->address);
}
if(qos > 2){
log__printf(NULL, MOSQ_LOG_INFO,
"Invalid QoS in subscription command from %s, disconnecting.",
context->address);
mosquitto__free(sub);
mosquitto__free(payload);
return MOSQ_ERR_MALFORMED_PACKET;
}
if(qos > context->max_qos){
qos = context->max_qos;
}


if(context->listener && context->listener->mount_point){
len = strlen(context->listener->mount_point) + slen + 1;
sub_mount = mosquitto__malloc(len+1);
if(!sub_mount){
mosquitto__free(sub);
mosquitto__free(payload);
return MOSQ_ERR_MALFORMED_PACKET;
}
if(qos > context->max_qos){
qos = context->max_qos;
return MOSQ_ERR_NOMEM;
}
snprintf(sub_mount, len, "%s%s", context->listener->mount_point, sub);
sub_mount[len] = '\0';

mosquitto__free(sub);
sub = sub_mount;

if(context->listener && context->listener->mount_point){
len = strlen(context->listener->mount_point) + slen + 1;
sub_mount = mosquitto__malloc(len+1);
if(!sub_mount){
mosquitto__free(sub);
mosquitto__free(payload);
return MOSQ_ERR_NOMEM;
}
log__printf(NULL, MOSQ_LOG_DEBUG, "\t%s (QoS %d)", sub, qos);

allowed = true;
rc2 = mosquitto_acl_check(context, sub, 0, NULL, qos, false, MOSQ_ACL_SUBSCRIBE);
switch(rc2){
case MOSQ_ERR_SUCCESS:
break;
case MOSQ_ERR_ACL_DENIED:
allowed = false;
if(context->protocol == mosq_p_mqtt5){
qos = MQTT_RC_NOT_AUTHORIZED;
}else if(context->protocol == mosq_p_mqtt311){
qos = 0x80;
}
snprintf(sub_mount, len, "%s%s", context->listener->mount_point, sub);
sub_mount[len] = '\0';

break;
default:
mosquitto__free(sub);
sub = sub_mount;
mosquitto__free(payload);
return rc2;
}

if(allowed){
rc2 = sub__add(context, sub, qos, subscription_identifier, subscription_options);
if(rc2 > 0){
mosquitto__free(sub);
mosquitto__free(payload);
return rc2;
}
log__printf(NULL, MOSQ_LOG_DEBUG, "\t%s (QoS %d)", sub, qos);

allowed = true;
rc2 = mosquitto_acl_check(context, sub, 0, NULL, qos, false, MOSQ_ACL_SUBSCRIBE);
switch(rc2){
case MOSQ_ERR_SUCCESS:
break;
case MOSQ_ERR_ACL_DENIED:
allowed = false;
if(context->protocol == mosq_p_mqtt5){
qos = MQTT_RC_NOT_AUTHORIZED;
}else if(context->protocol == mosq_p_mqtt311){
qos = 0x80;
}
break;
default:
mosquitto__free(sub);
return rc2;
}

if(allowed){
rc2 = sub__add(context, sub, qos, subscription_identifier, subscription_options);
if(rc2 > 0){
mosquitto__free(sub);
return rc2;
}
if(context->protocol == mosq_p_mqtt311 || context->protocol == mosq_p_mqtt31){
if(rc2 == MOSQ_ERR_SUCCESS || rc2 == MOSQ_ERR_SUB_EXISTS){
if(retain__queue(context, sub, qos, 0)) rc = 1;
}
}else{
if((retain_handling == MQTT_SUB_OPT_SEND_RETAIN_ALWAYS)
|| (rc2 == MOSQ_ERR_SUCCESS && retain_handling == MQTT_SUB_OPT_SEND_RETAIN_NEW)){

if(retain__queue(context, sub, qos, subscription_identifier)) rc = 1;
}
if(context->protocol == mosq_p_mqtt311 || context->protocol == mosq_p_mqtt31){
if(rc2 == MOSQ_ERR_SUCCESS || rc2 == MOSQ_ERR_SUB_EXISTS){
if(retain__queue(context, sub, qos, 0)) rc = 1;
}
}else{
if((retain_handling == MQTT_SUB_OPT_SEND_RETAIN_ALWAYS)
|| (rc2 == MOSQ_ERR_SUCCESS && retain_handling == MQTT_SUB_OPT_SEND_RETAIN_NEW)){

log__printf(NULL, MOSQ_LOG_SUBSCRIBE, "%s %d %s", context->id, qos, sub);
if(retain__queue(context, sub, qos, subscription_identifier)) rc = 1;
}
}
mosquitto__free(sub);

tmp_payload = mosquitto__realloc(payload, payloadlen + 1);
if(tmp_payload){
payload = tmp_payload;
payload[payloadlen] = qos;
payloadlen++;
}else{
mosquitto__free(payload);
log__printf(NULL, MOSQ_LOG_SUBSCRIBE, "%s %d %s", context->id, qos, sub);
}
mosquitto__free(sub);

tmp_payload = mosquitto__realloc(payload, payloadlen + 1);
if(tmp_payload){
payload = tmp_payload;
payload[payloadlen] = qos;
payloadlen++;
}else{
mosquitto__free(payload);

return MOSQ_ERR_NOMEM;
}
return MOSQ_ERR_NOMEM;
}
}

if(context->protocol != mosq_p_mqtt31){
if(payloadlen == 0){
/* No subscriptions specified, protocol error. */
fprintf(stderr, "no payload\n");
return MOSQ_ERR_MALFORMED_PACKET;
}
}
Expand Down
6 changes: 6 additions & 0 deletions test/broker/06-bridge-b2br-remapping.py
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Original file line number Diff line number Diff line change
Expand Up @@ -17,6 +17,9 @@ def write_config(filename, port1, port2, protocol_version):
f.write("topic +/value in 0 local3/topic/ remote3/topic/\n")
f.write("topic ic/+ in 0 local4/top remote4/tip\n")
f.write("topic clients/total in 0 test/mosquitto/org $SYS/broker/\n")
f.write('topic rmapped in 0 "" remote/mapped/\n')
f.write('topic lmapped in 0 local/mapped/ ""\n')
f.write('topic "" in 0 local/single remote/single\n')
f.write("notifications false\n")
f.write("restart_timeout 5\n")
f.write("bridge_protocol_version %s\n" % (protocol_version))
Expand Down Expand Up @@ -70,6 +73,9 @@ def inner_test(bridge, sock, proto_ver):
('local3/topic/something/value', 'remote3/topic/something/value'),
('local4/topic/something', 'remote4/tipic/something'),
('test/mosquitto/orgclients/total', '$SYS/broker/clients/total'),
('local/mapped/lmapped', 'lmapped'),
('rmapped', 'remote/mapped/rmapped'),
('local/single', 'remote/single'),
]

for (local_topic, remote_topic) in cases:
Expand Down
3 changes: 3 additions & 0 deletions test/unit/util_topic_test.c
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Original file line number Diff line number Diff line change
Expand Up @@ -196,6 +196,7 @@ static void TEST_invalid(void)
no_match_helper(MOSQ_ERR_INVAL, "foo/#abc", "foo");
no_match_helper(MOSQ_ERR_INVAL, "#abc", "foo");
no_match_helper(MOSQ_ERR_INVAL, "/#a", "foo/bar");
no_match_helper(MOSQ_ERR_INVAL, "", "foo/bar/#");
}

/* ========================================================================
Expand Down Expand Up @@ -233,6 +234,7 @@ static void TEST_pub_topic_invalid(void)
pub_topic_helper("pub/topic#", MOSQ_ERR_INVAL);
pub_topic_helper("pub/topic/#", MOSQ_ERR_INVAL);
pub_topic_helper("+/pub/topic", MOSQ_ERR_INVAL);
pub_topic_helper("", MOSQ_ERR_INVAL);
}


Expand Down Expand Up @@ -278,6 +280,7 @@ static void TEST_sub_topic_invalid(void)
sub_topic_helper("sub/#topic", MOSQ_ERR_INVAL);
sub_topic_helper("sub/topic#", MOSQ_ERR_INVAL);
sub_topic_helper("#/sub/topic", MOSQ_ERR_INVAL);
sub_topic_helper("", MOSQ_ERR_INVAL);
}

/* ========================================================================
Expand Down
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