[Bug 2519] New: Obsolete SSHv1 config options

[bugzilla-daemon at bugzilla.mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=2519

            Bug ID: 2519
           Summary: Obsolete SSHv1 config options
           Product: Portable OpenSSH
           Version: 7.1p1
          Hardware: Other
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P5
         Component: ssh
          Assignee: unassigned-bugs at mindrot.org
          Reporter: jjelen at redhat.com

When building openssh without support for SSHv1 protocol, we should
obsolete options that are effective only for this protocol. The manual
pages are long, people tend to ignore the notes in manual pages (or
manual pages overall) and are wondering "why it does not work" (for
example Cipher option [1]). It applies for both client and server
config options.

There are few ways how to do this, either put the whole options into
#ifdef, or make them "oUnsupported". Or create some transition Obsolete
warning that would not fail

The same end should be given to their description in manual pages, but
it would require some pre-processing (not sure about the most clean
way).

This is quite last missing piece of SSHv1 support in current release. I
didn't find any place where it is tracked, except my last note in bug
#2513. Also without patch, but I can create some, if you let me know
that you are interested in such change.

[1] https://bugzilla.redhat.com/show_bug.cgi?id=1281705

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