openssh bugs - May 2019 - [Bug 3015] New: ssh: usability issue with -J and multiple jump hosts

https://bugzilla.mindrot.org/show_bug.cgi?id=3015

            Bug ID: 3015
           Summary: ssh: usability issue with -J and multiple jump hosts
           Product: Portable OpenSSH
           Version: 7.9p1
          Hardware: All
               URL: https://bugs.debian.org/929669
                OS: Linux
            Status: NEW
          Severity: minor
          Priority: P5
         Component: ssh
          Assignee: unassigned-bugs at mindrot.org
          Reporter: pabs3 at bonedaddy.net

When I try to proxy jump through multiple hosts using the most
intuitive way to do that (multiple -J options), ssh misleads me into
believing that ssh only supports a single jump host but if I use the
right syntax by separating the hosts with commas then it works fine.

I suggest that ssh either automatically combine the values of all the
proxy jump options using commas or print an error directing the user to
manually combine the values of all the proxy jump options using commas.

   $ ssh -J master.debian.org -J paradis.debian.org draghi.debian.org
echo yay
   Only a single -J option permitted

   $ ssh -J master.debian.org,paradis.debian.org draghi.debian.org echo
yay
   yay

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Damien Miller <djm at mindrot.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |djm at mindrot.org
         Resolution|---                         |WONTFIX

--- Comment #1 from Damien Miller <djm at mindrot.org> ---
Unfortunately, combining options as you suggest would make the handling
of -J inconsistent with other command-line options as everything is
first-match-wins. I don't think introducing an inconsistency is worth
it for this case.

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--- Comment #2 from Paul Wise <pabs3 at bonedaddy.net> ---
What about my other suggestion?
> print an error directing the user to manually combine the values of all the
proxy jump options using commas.
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Paul Wise <pabs3 at bonedaddy.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|WONTFIX                     |---
             Status|RESOLVED                    |REOPENED

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Damien Miller <djm at mindrot.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |dtucker at dtucker.net
   Attachment #3290|                            |ok?(dtucker at dtucker.net)
              Flags|                            |

--- Comment #3 from Damien Miller <djm at mindrot.org> ---
Created attachment 3290
  --> https://bugzilla.mindrot.org/attachment.cgi?id=3290&action=edit
slightly more helpful error message

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Damien Miller <djm at mindrot.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Blocks|                            |2988


Referenced Bugs:

https://bugzilla.mindrot.org/show_bug.cgi?id=2988
[Bug 2988] Tracking bug for 8.1 release
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--- Comment #4 from Paul Wise <pabs3 at bonedaddy.net> ---
Looks good, thanks.

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Damien Miller <djm at mindrot.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|REOPENED                    |RESOLVED
         Resolution|---                         |FIXED

--- Comment #5 from Damien Miller <djm at mindrot.org> ---
This is applied and will be in OpenSSH 8.1.

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Damien Miller <djm at mindrot.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |CLOSED

--- Comment #6 from Damien Miller <djm at mindrot.org> ---
Close bugs fixed in openssh-8.1 release cycle

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Damien Miller <djm at mindrot.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Attachment #3290|ok?(dtucker at dtucker.net)    |
              Flags|                            |

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