[Bug 866] ssh(1) is too picky about unknown options in ~/.ssh/config

[bugzilla-daemon at bugzilla.mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=866

--- Comment #19 from Josh Triplett <josh at joshtriplett.org>  ---
(In reply to comment #17)
> Created attachment 1610 [details]
> Patch which allows OpenSSH to ignore unknown options.
> 
> This is a patch which implements alternative 1 from Josh Triplett. This
> patch makes ssh ignore all unknown options which are prefixed with '@'.
> For example, the following works:
> 
> Host *
>   @InvalidOption asdf
> 
> Any chance of having this patch (or something similar) included in
> OpenSSH?

This patch looks very promising.  However, it doesn't handle the case
of ignoring an option that OpenSSH knows about but doesn't support,
such as the GSSAPI* options on an installation of OpenSSH that got
configured without GSSAPI support.  These options have an opcode of
oUnsupported.  This seems simple enough to fix: change "return
keywords[i].opcode;" to:

if (ignoreunknown && keywords[i].opcode == oUnsupported)
    return oIgnored;
return keywords[i].opcode;


Real-world application of this: I set "GSSAPIAuthentication no" in my
~/.ssh/config, and OpenSSH on my N900 doesn't have GSSAPI support, so I
get a warning message every time I use ssh.

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