[Bug 1801128] Re: OpenSSH 7.7 -w tunnel bug

[ Christian Ehrhardt ]

tagged and uploaded to C-unapproved

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https://bugs.launchpad.net/bugs/1801128

Title:
  OpenSSH 7.7 -w tunnel bug

Status in openssh package in Ubuntu:
  In Progress
Status in openssh source package in Cosmic:
  In Progress

Bug description:
  [Impact]

  A regression in OpenSSH 7.7 breaks tunnelling via the -w switch in the
  ssh command.

  [Test Case]

  # lxc launch ubuntu:cosmic tester && lxc exec tester bash

  # apt update && \
  apt dist-upgrade -y && \
  sed -i 's/PasswordAuthentication no/PasswordAuthentication yes/g' /etc/ssh/sshd_config && \
  service sshd restart && \
  echo ubuntu:ubuntu | chpasswd

  # ssh -w any ubuntu at localhost
  ubuntu at localhost's password: 
  Tunnel device open failed.
  Could not request tunnel forwarding.

  [Regression Potential]

  This is already fixed and tested upstream, and thus has little
  regression potential.

  [Original Description]

  Just upgraded to cosmic, which picks up OpenSSH 7.7.

  OpenSSH 7.7 has known bug
  https://bugzilla.mindrot.org/show_bug.cgi?id=2855 which is fixed in
  OpenSSH 7.8. It's a regression that completely breaks -w tunneling.

  The OpenSSH bug contains a trivial two-line patch to fix the bug. I
  downloaded the Ubuntu openssh package source, applied the patch and
  rebuilt, and can confirm that is does fix the problem.

  Any chance we could get this patch backported to Cosmic?

  ProblemType: Bug
  DistroRelease: Ubuntu 18.10
  Package: openssh-client 1:7.7p1-4
  ProcVersionSignature: Ubuntu 4.18.0-10.11-generic 4.18.12
  Uname: Linux 4.18.0-10-generic x86_64
  ApportVersion: 2.20.10-0ubuntu13
  Architecture: amd64
  Date: Thu Nov 1 09:36:16 2018
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  RelatedPackageVersions:
   ssh-askpass N/A
   libpam-ssh N/A
   keychain N/A
   ssh-askpass-gnome N/A
  SSHClientVersion: OpenSSH_7.7p1 Ubuntu-4, OpenSSL 1.0.2n 7 Dec 2017
  SourcePackage: openssh
  UpgradeStatus: Upgraded to cosmic on 2018-11-01 (0 days ago)

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