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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Work logged] (SSHD-902) Local port forwarding: EOF is not handled properly
Date Thu, 18 Apr 2019 04:51:00 GMT

     [ https://issues.apache.org/jira/browse/SSHD-902?focusedWorklogId=229560&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-229560
]

ASF GitHub Bot logged work on SSHD-902:
---------------------------------------

                Author: ASF GitHub Bot
            Created on: 18/Apr/19 04:50
            Start Date: 18/Apr/19 04:50
    Worklog Time Spent: 10m 
      Work Description: cegganesh84 commented on issue #100: SSHD-902 Shutdown output when
receiving SSH_MSG_CHANNEL_EOF
URL: https://github.com/apache/mina-sshd/pull/100#issuecomment-484354887
 
 
   Hi,
   
   We are seeing issues in our port forwarding where the EOF messages or not handled properly.
Will this pull request be merged sooner, so that we can try it out in the development environment.
   
   Thanks,
   Ganesh
 
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Issue Time Tracking
-------------------

    Worklog Id:     (was: 229560)
    Time Spent: 20m  (was: 10m)

> Local port forwarding: EOF is not handled properly
> --------------------------------------------------
>
>                 Key: SSHD-902
>                 URL: https://issues.apache.org/jira/browse/SSHD-902
>             Project: MINA SSHD
>          Issue Type: Bug
>    Affects Versions: 2.1.0
>         Environment: OS: both Windows 10 and Red Hat Enterprise Linux Server release
7.4 (Maipo) Linux 4.1.12-124.19.2.el7uek.x86_64 x86_64
> JDK: 1.8.0_201
> SSHD: 2.1.0
>            Reporter: Yumin Sang
>            Priority: Critical
>         Attachments: AbstractServerCloseTestSupport.java, ApacheServerApacheClientTest.java,
fixBasedOn2.1.0.zip, packets.PNG
>
>          Time Spent: 20m
>  Remaining Estimate: 0h
>
> Set remote port to a real listening port but is not for DB connection. Start a local
port forwarding. Try getting a connection through the established SSH tunnel. This operation
is expected to be finished with some error, but it hangs.
> Reproduce steps:
>  # prepare a Linux server and find a listening port, such as 2049, which is not of DB
listener.
>  # get attached demo code: ApacheServerApacheClientTest.java and AbstractServerCloseTestSupport.java.
They are modified from the ones in mina-sshd-2.1.0\sshd-core\src\test\java\org\apache\sshd\common\forward.
Please replace the corresponding ones.
>  # download ojdbc8.jar from [https://www.oracle.com/technetwork/database/features/jdbc/jdbc-ucp-122-3110062.html?|https://www.oracle.com/technetwork/database/features/jdbc/jdbc-ucp-122-3110062.html] and
add it to classpath.
>  # set up a local port forwarding tunnel by Putty or other tools. Set the forwarded
local port to 37777, remote server/port to the server/port in step 1.
>  # run  ApacheServerApacheClientTest.java. It finishes with error like java.io.IOException:
Got minus one from a read call. This is expected behavior.
>  # change org.apache.sshd.common.forward.AbstractServerCloseTestSupport#testLocalPortForwardOneBuffer:
uncomment line "int serverPort = startLocalPF();" and comment line "int serverPort = 37777;"
>  # change org.apache.sshd.common.forward.ApacheServerApacheClientTest#createClient,
set username, host and password to the ones in step 1.
>  # run  ApacheServerApacheClientTest.java again and it hangs.
> By capturing loopback packets, it can be found the interactions are same, but SSHD make
different process from what Putty does. In attached snapshot, the "nfs" is of port 2049.
> Did a bit digging up, and it seems that EOF is not handled properly. Here is a call stack:
> handleEof:873, AbstractChannel (org.apache.sshd.common.channel)
> channelEof:498, AbstractConnectionService (org.apache.sshd.common.session.helpers)
> process:357, AbstractConnectionService (org.apache.sshd.common.session.helpers)
> doHandleMessage:626, AbstractSession (org.apache.sshd.common.session.helpers)
> handleMessage:559, AbstractSession (org.apache.sshd.common.session.helpers)
> decode:1542, AbstractSession (org.apache.sshd.common.session.helpers)
> messageReceived:520, AbstractSession (org.apache.sshd.common.session.helpers)
> messageReceived:63, AbstractSessionIoHandler (org.apache.sshd.common.session.helpers)
> handleReadCycleCompletion:339, Nio2Session (org.apache.sshd.common.io.nio2)
> onCompleted:318, Nio2Session$1 (org.apache.sshd.common.io.nio2)
> onCompleted:315, Nio2Session$1 (org.apache.sshd.common.io.nio2)
> lambda$completed$0:38, Nio2CompletionHandler (org.apache.sshd.common.io.nio2)
> run:-1, 391147216 (org.apache.sshd.common.io.nio2.Nio2CompletionHandler$$Lambda$73)
> doPrivileged:-1, AccessController (java.security)
> completed:37, Nio2CompletionHandler (org.apache.sshd.common.io.nio2)
> invokeUnchecked:126, Invoker (sun.nio.ch)
> run:218, Invoker$2 (sun.nio.ch)
> run:112, AsynchronousChannelGroupImpl$1 (sun.nio.ch)
> runWorker:1149, ThreadPoolExecutor (java.util.concurrent)
> run:624, ThreadPoolExecutor$Worker (java.util.concurrent)
> run:748, Thread (java.lang)



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