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Bug
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Resolution: Done
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Minor
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7.1.0.DR13
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None
If you send MCMP message to the undertow balancer with
Connection header set to Keep-Alive(Default)
Balancer is keeping this connection open(default 60s) as he responds with
Connection: Keep-Alive
Note that apache httpd balancer is answering to such messages with
Connection: Close
One can theoretically DDoS balancer with workers.
Httpd
[root@localhost backup]# curl -X CONFIG --data "JVMRoute="a"&Host=127.0.0.1&Maxattempts=1000&Port=8747&Type=http&ping=10000" 127.0.0.1:8747 -v * About to connect() to 127.0.0.1 port 8747 (#0) * Trying 127.0.0.1... * Connected to 127.0.0.1 (127.0.0.1) port 8747 (#0) > CONFIG / HTTP/1.1 > User-Agent: curl/7.29.0 > Host: 127.0.0.1:8747 > Accept: */* > Content-Length: 73 > Content-Type: application/x-www-form-urlencoded > * upload completely sent off: 73 out of 73 bytes < HTTP/1.1 200 OK < Date: Wed, 04 Jan 2017 13:29:28 GMT < Server: Apache/2.4.23 (Red Hat) < Connection: close < Transfer-Encoding: chunked < Content-Type: httpd/unix-directory < * Closing connection 0
Undertow
[root@localhost backup]# curl -X CONFIG --data "JVMRoute="a"&Host=127.0.0.1&Maxattempts=1000&Port=8484&Type=http&ping=10000" 127.0.0.1:8484 -v * About to connect() to 127.0.0.1 port 8484 (#0) * Trying 127.0.0.1... * Connected to 127.0.0.1 (127.0.0.1) port 8484 (#0) > CONFIG / HTTP/1.1 > User-Agent: curl/7.29.0 > Host: 127.0.0.1:8484 > Accept: */* > Content-Length: 73 > Content-Type: application/x-www-form-urlencoded > * upload completely sent off: 73 out of 73 bytes < HTTP/1.1 200 OK < Connection: keep-alive < X-Powered-By: Undertow/1 < Server: JBoss-EAP/7 < Content-Type: text/plain; charset=ISO-8859-1 < Content-Length: 0 < Date: Wed, 04 Jan 2017 13:25:02 GMT < * Connection #0 to host 127.0.0.1 left intact [root@localhost backup]# curl -X CONFIG --header "Connection: close" --data "JVMRoute="a"&Host=127.0.0.1&Maxattempts=1000&Port=8484&Type=http&ping=10000" 127.0.0.1:8484 -v * About to connect() to 127.0.0.1 port 8484 (#0) * Trying 127.0.0.1... * Connected to 127.0.0.1 (127.0.0.1) port 8484 (#0) > CONFIG / HTTP/1.1 > User-Agent: curl/7.29.0 > Host: 127.0.0.1:8484 > Accept: */* > Connection: close > Content-Length: 73 > Content-Type: application/x-www-form-urlencoded > * upload completely sent off: 73 out of 73 bytes < HTTP/1.1 200 OK < Connection: close < X-Powered-By: Undertow/1 < Server: JBoss-EAP/7 < Content-Type: text/plain; charset=ISO-8859-1 < Content-Length: 0 < Date: Wed, 04 Jan 2017 13:35:39 GMT < * Closing connection 0
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