mirror of
https://github.com/moparisthebest/curl
synced 2024-12-24 09:08:49 -05:00
mqtt: detect illegal and too large file size
Add test 3017 and 3018 to verify. Closes #7166
This commit is contained in:
parent
4f209d8833
commit
8ccf75532b
10
lib/mqtt.c
10
lib/mqtt.c
@ -477,6 +477,12 @@ static CURLcode mqtt_read_publish(struct Curl_easy *data, bool *done)
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/* -- switched state -- */
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remlen = mq->remaining_length;
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infof(data, "Remaining length: %zd bytes\n", remlen);
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if(data->set.max_filesize &&
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(curl_off_t)remlen > data->set.max_filesize) {
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failf(data, "Maximum file size exceeded");
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result = CURLE_FILESIZE_EXCEEDED;
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goto end;
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}
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Curl_pgrsSetDownloadSize(data, remlen);
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data->req.bytecount = 0;
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data->req.size = remlen;
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@ -582,6 +588,10 @@ static CURLcode mqtt_doing(struct Curl_easy *data, bool *done)
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Curl_debug(data, CURLINFO_HEADER_IN, (char *)&byte, 1);
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pkt[mq->npacket++] = byte;
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} while((byte & 0x80) && (mq->npacket < 4));
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if(nread && (byte & 0x80))
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/* MQTT supports up to 127 * 128^0 + 127 * 128^1 + 127 * 128^2 +
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127 * 128^3 bytes. server tried to send more */
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result = CURLE_WEIRD_SERVER_REPLY;
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if(result)
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break;
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mq->remaining_length = mqtt_decode_len(&pkt[0], mq->npacket, NULL);
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@ -232,4 +232,6 @@ test2100 \
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\
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test3000 test3001 test3002 test3003 test3004 test3005 test3006 test3007 \
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test3008 test3009 test3010 test3011 test3012 test3013 test3014 test3015 \
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test3016
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test3016 \
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\
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test3017 test3018
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67
tests/data/test3017
Normal file
67
tests/data/test3017
Normal file
@ -0,0 +1,67 @@
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<testcase>
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<info>
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<keywords>
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MQTT
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MQTT SUBSCRIBE
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</keywords>
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</info>
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#
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# Server-side
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<reply>
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<data nocheck="yes">
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hello
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</data>
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<datacheck hex="yes">
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00 04 33 30 31 37 68 65 6c 6c 6f 5b 4c 46 5d 0a
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</datacheck>
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<servercmd>
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excessive-remaining TRUE
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</servercmd>
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</reply>
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#
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# Client-side
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<client>
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<features>
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mqtt
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</features>
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<server>
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mqtt
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</server>
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<name>
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MQTT SUBSCRIBE with pathological PUBLISH length
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</name>
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<command option="binary-trace">
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mqtt://%HOSTIP:%MQTTPORT/%TESTNUMBER -m 3
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</command>
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</client>
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#
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# Verify data after the test has been "shot"
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<verify>
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# These are hexadecimal protocol dumps from the client
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#
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# Strip out the random part of the client id from the CONNECT message
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# before comparison
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<strippart>
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s/^(.* 00044d5154540402003c000c6375726c).*/$1/
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</strippart>
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# on windows the disconnect is never seen - no idea why
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<strip>
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^server DISCONNECT 0 e000
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</strip>
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<protocol>
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client CONNECT 18 00044d5154540402003c000c6375726c
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server CONNACK 2 20020000
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client SUBSCRIBE 9 000100043330313700
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server SUBACK 3 9003000100
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server PUBLISH c 30ffffff8000043330313768656c6c6f0a
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</protocol>
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# 8 is CURLE_WEIRD_SERVER_REPLY
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<errorcode>
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8
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</errorcode>
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</verify>
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</testcase>
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65
tests/data/test3018
Normal file
65
tests/data/test3018
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@ -0,0 +1,65 @@
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<testcase>
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<info>
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<keywords>
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MQTT
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MQTT SUBSCRIBE
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--max-filesize
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</keywords>
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</info>
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#
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# Server-side
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<reply>
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<data nocheck="yes">
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hello
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</data>
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<datacheck hex="yes">
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00 04 33 30 31 38 68 65 6c 6c 6f 5b 4c 46 5d 0a
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</datacheck>
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</reply>
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#
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# Client-side
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<client>
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<features>
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mqtt
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</features>
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<server>
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mqtt
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</server>
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<name>
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MQTT SUBSCRIBE with PUBLISH larger than --max-filesize
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</name>
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<command option="binary-trace">
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mqtt://%HOSTIP:%MQTTPORT/%TESTNUMBER --max-filesize 11
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</command>
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</client>
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#
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# Verify data after the test has been "shot"
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<verify>
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# These are hexadecimal protocol dumps from the client
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#
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# Strip out the random part of the client id from the CONNECT message
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# before comparison
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<strippart>
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s/^(.* 00044d5154540402003c000c6375726c).*/$1/
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</strippart>
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# on windows the disconnect is never seen - no idea why
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<strip>
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^server DISCONNECT 0 e000
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</strip>
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<protocol>
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client CONNECT 18 00044d5154540402003c000c6375726c
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server CONNACK 2 20020000
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client SUBSCRIBE 9 000100043330313800
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server SUBACK 3 9003000100
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server PUBLISH c 300c00043330313868656c6c6f0a
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</protocol>
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# 63 is CURLE_FILESIZE_EXCEEDED
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<errorcode>
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63
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</errorcode>
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</verify>
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</testcase>
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@ -106,6 +106,7 @@ struct configurable {
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this */
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bool publish_before_suback;
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bool short_publish;
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bool excessive_remaining;
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unsigned char error_connack;
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int testnum;
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};
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@ -130,6 +131,7 @@ static void resetdefaults(void)
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config.version = CONFIG_VERSION;
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config.publish_before_suback = FALSE;
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config.short_publish = FALSE;
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config.excessive_remaining = FALSE;
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config.error_connack = 0;
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config.testnum = 0;
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}
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@ -171,6 +173,10 @@ static void getconfig(void)
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config.testnum = atoi(value);
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logmsg("testnum = %d", config.testnum);
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}
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else if(!strcmp(key, "excessive-remaining")) {
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logmsg("excessive-remaining set");
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config.excessive_remaining = TRUE;
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}
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}
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}
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fclose(fp);
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@ -337,7 +343,8 @@ static int disconnect(FILE *dump, curl_socket_t fd)
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*/
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/* return number of bytes used */
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static int encode_length(size_t packetlen, char *remlength) /* 4 bytes */
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static int encode_length(size_t packetlen,
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unsigned char *remlength) /* 4 bytes */
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{
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int bytes = 0;
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unsigned char encode;
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@ -393,10 +400,19 @@ static int publish(FILE *dump,
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ssize_t packetlen;
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ssize_t sendamount;
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ssize_t rc;
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char rembuffer[4];
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unsigned char rembuffer[4];
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int encodedlen;
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encodedlen = encode_length(remaininglength, rembuffer);
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if(config.excessive_remaining) {
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/* manually set illegal remaining length */
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rembuffer[0] = 0xff;
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rembuffer[1] = 0xff;
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rembuffer[2] = 0xff;
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rembuffer[3] = 0x80; /* maximum allowed here by spec is 0x7f */
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encodedlen = 4;
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}
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else
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encodedlen = encode_length(remaininglength, rembuffer);
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/* one packet type byte (possibly two more for packetid) */
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packetlen = remaininglength + encodedlen + 1;
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