Steven created SSHD-1177:
----------------------------
Summary: SshClient connect method throws exception when called
with HostConfigEntry using proxy jump
Key: SSHD-1177
URL: https://issues.apache.org/jira/browse/SSHD-1177
Project: MINA SSHD
Issue Type: Question
Affects Versions: 2.6.0, 2.7.0
Environment: Windows 10, java 1.8.0_271
Ubuntu 20.04.2 LTS, 14.0.2+12-Ubuntu-120.04
Reporter: Steven
Attachments: AppTest.java
Our application has a requirement to connect through a proxy and execute SFTP
commands.
My question is 1) Am I using the proxy jump correctly? and 2) If I am, is this
a bug?
This example works correctly:
{{ SshClient client = SshClient.setUpDefaultClient();}}
{{ client.start();}}
{{ try (ClientSession session = client.connect("<USER_NAME>", "<HOST_ONE>",
22)}}
{{ .verify(1000*1000).getSession()) {}}
{{ assertNotNull(session);}}
{{ session.addPasswordIdentity("<PASSWORD>");}}
{{ session.auth().verify(1000*30);}}
{{ assertTrue(session.isAuthenticated());}}
{{ System.out.println(session.isAuthenticated());}}
{{ } catch (IOException e) {}}
{{ e.printStackTrace();}}
{{ }}}
{{}}
This example fails with "org.apache.sshd.common.SshException: No more
authentication methods available"
{{ SshClient client = SshClient.setUpDefaultClient();}}
{{ client.start();}}
{{ try (ClientSession session = client.connect(new HostConfigEntry("",
"<HOST_ONE>", 22,}}
{{ "<USER_NAME>", "<USER_NAME>" + "@" + "<HOST_TWO>" + ":" + "22"))}}
{{ .verify(1000*1000).getSession()) {}}
{{ assertNotNull(session);}}
{{ session.addPasswordIdentity("<PASSWORD>");}}
{{ session.auth().verify(1000*30);}}
{{ assertTrue(session.isAuthenticated());}}
{{ System.out.println(session.isAuthenticated());}}
{{ } catch (IOException e) { }}
{{ e.printStackTrace();}}
{{ } }}
Stack trace:
org.apache.sshd.common.SshException: No more authentication methods available
at
org.apache.sshd.common.future.AbstractSshFuture.verifyResult(AbstractSshFuture.java:126)
at
org.apache.sshd.client.future.DefaultConnectFuture.verify(DefaultConnectFuture.java:42)
at
org.apache.sshd.client.future.DefaultConnectFuture.verify(DefaultConnectFuture.java:34)
at
com.precisely.SFTPClient.AppTest.testSshConnectionWithProxyJump(AppTest.java:75)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at junit.framework.TestCase.runTest(TestCase.java:154)
at junit.framework.TestCase.runBare(TestCase.java:127)
at junit.framework.TestResult$1.protect(TestResult.java:106)
at junit.framework.TestResult.runProtected(TestResult.java:124)
at junit.framework.TestResult.run(TestResult.java:109)
at junit.framework.TestCase.run(TestCase.java:118)
at junit.framework.TestSuite.runTest(TestSuite.java:208)
at junit.framework.TestSuite.run(TestSuite.java:203)
at
org.eclipse.jdt.internal.junit.runner.junit3.JUnit3TestReference.run(JUnit3TestReference.java:124)
at
org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:41)
at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:541)
at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:763)
at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:463)
at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:209)
Caused by: org.apache.sshd.common.SshException: No more authentication methods
available
at
org.apache.sshd.client.session.ClientUserAuthService.tryNext(ClientUserAuthService.java:353)
at
org.apache.sshd.client.session.ClientUserAuthService.processUserAuth(ClientUserAuthService.java:288)
at
org.apache.sshd.client.session.ClientUserAuthService.process(ClientUserAuthService.java:225)
at
org.apache.sshd.common.session.helpers.AbstractSession.doHandleMessage(AbstractSession.java:503)
at
org.apache.sshd.common.session.helpers.AbstractSession.handleMessage(AbstractSession.java:429)
at
org.apache.sshd.common.session.helpers.AbstractSession.decode(AbstractSession.java:1466)
at
org.apache.sshd.common.session.helpers.AbstractSession.messageReceived(AbstractSession.java:389)
at
org.apache.sshd.common.session.helpers.AbstractSessionIoHandler.messageReceived(AbstractSessionIoHandler.java:64)
at org.apache.sshd.mina.MinaService.messageReceived(MinaService.java:156)
at
org.apache.mina.core.filterchain.DefaultIoFilterChain$TailFilter.messageReceived(DefaultIoFilterChain.java:997)
at
org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived(DefaultIoFilterChain.java:641)
at
org.apache.mina.core.filterchain.DefaultIoFilterChain.access$1300(DefaultIoFilterChain.java:48)
at
org.apache.mina.core.filterchain.DefaultIoFilterChain$EntryImpl$1.messageReceived(DefaultIoFilterChain.java:1114)
at
org.apache.mina.core.filterchain.IoFilterAdapter.messageReceived(IoFilterAdapter.java:121)
at
org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived(DefaultIoFilterChain.java:641)
at
org.apache.mina.core.filterchain.DefaultIoFilterChain.fireMessageReceived(DefaultIoFilterChain.java:634)
at
org.apache.mina.core.polling.AbstractPollingIoProcessor.read(AbstractPollingIoProcessor.java:539)
at
org.apache.mina.core.polling.AbstractPollingIoProcessor.access$1200(AbstractPollingIoProcessor.java:68)
at
org.apache.mina.core.polling.AbstractPollingIoProcessor$Processor.process(AbstractPollingIoProcessor.java:1241)
at
org.apache.mina.core.polling.AbstractPollingIoProcessor$Processor.process(AbstractPollingIoProcessor.java:1230)
at
org.apache.mina.core.polling.AbstractPollingIoProcessor$Processor.run(AbstractPollingIoProcessor.java:683)
at
org.apache.mina.util.NamePreservingRunnable.run(NamePreservingRunnable.java:64)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
I was following this sample code here:
[https://github.com/apache/mina-sshd/blob/master/docs/internals.md#ssh-jumps]
I tried to dig into it a bit, and it looks like when we call SshClient.connect
the code ends up also attempting to authenticate (hence the "No more
authentication methods available" exception message). In the first example we
don't attempt to authenticate until we actually call ClientSession.auth.
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