[Bug 2089] New: filter out bad host key algorithms

[bugzilla-daemon at mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=2089

            Bug ID: 2089
           Summary: filter out bad host key algorithms
    Classification: Unclassified
           Product: Portable OpenSSH
           Version: 6.1p1
          Hardware: Other
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P5
         Component: Miscellaneous
          Assignee: unassigned-bugs at mindrot.org
          Reporter: ossman at cendio.se

Created attachment 2242
  --> https://bugzilla.mindrot.org/attachment.cgi?id=2242&action=edit
host_key_alg_filter.patch

Currently the clients will just exit if you give them anything bad in
HostKeyAlgorithms. This can be annoying for calling code though as you
might not know which algorithms this particular instance of ssh
supports.

Instead I propose simply filtering out unsupported algorithms and
proceeding with what's left. Attached patch does just that.

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