PowerShell / PowerShell/Win32-OpenSSH

Channel.invoke_shell() failed with latest version of Openssh

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Description

Troubleshooting steps
https://github.com/PowerShell/Win32-OpenSSH/wiki/Troubleshooting-Steps

Terminal issue? please go through wiki
https://github.com/PowerShell/Win32-OpenSSH/wiki/TTY-PTY-support-in-Windows-OpenSSH

Please answer the following

"OpenSSH for Windows" version
8.0.0.0

Server OperatingSystem
Windows Server 2016 Standard Evaluation

Client OperatingSystem
CentOS Linux release 7.6.1810 (Core)

What is failing

Python 3.6.7 (default, Dec  5 2018, 15:02:05)
[GCC 4.8.5 20150623 (Red Hat 4.8.5-36)] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import paramiko
>>> cl = paramiko.SSHClient()
>>> cl.set_missing_host_key_policy(paramiko.AutoAddPolicy())
>>> cl.connect(hostname=hostname, username=username, password=password)
>>> ch = cl.get_transport().open_session()
>>> ch.invoke_shell()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/myenv/lib64/python3.6/site-packages/paramiko/channel.py", line 72, in _check
    return func(self, *args, **kwds)
  File "/home/myenv/lib64/python3.6/site-packages/paramiko/channel.py", line 230, in invoke_shell
    self._wait_for_event()
  File "/home/myenv/lib64/python3.6/site-packages/paramiko/channel.py", line 1208, in _wait_for_event
    raise e
paramiko.ssh_exception.SSHException: Channel closed.

Expected output
ch.invoke_shell() should be successful. This works in v7.7.2.0p1-Beta and below versions.

Actual output
paramiko.ssh_exception.SSHException: Channel closed

Contributor guide

Open the contributing guide

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start with the supplied Python 3.6 reproduction at Channel.invoke_shell in paramiko/channel.py, using OpenSSH for Windows 8.0.0.0 and the older v7.7.2.0p1-Beta for comparison. Follow the linked troubleshooting and TTY/PTY guidance, then verify that the channel remains open and ch.invoke_shell() succeeds with the affected server version.

Written by the indexing model from the issue text.

Assessment

Tech stack
python
Domain
networking
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
35/100

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