openssh bugs - Oct 2008 - [Bug 1529] New: Need a method to add new configuration options in a backwards-compatible fashion (avoiding "Bad configuration option")

https://bugzilla.mindrot.org/show_bug.cgi?id=1529

           Summary: Need a method to add new configuration options in a
                    backwards-compatible fashion (avoiding "Bad
                    configuration option")
           Product: Portable OpenSSH
           Version: 5.1p1
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Miscellaneous
        AssignedTo: unassigned-bugs at mindrot.org
        ReportedBy: nectar at apple.com


Currently the OpenSSH configuration options parser terminates when an
unknown configuration option is encountered.  For example, OpenSSH
implementations without Simon Wilkinson's Kerberos support patch will
choke on user?s ssh_config files that contain Kerberos options.  This
can be problematic for heterogenous environments, where configuration
files might be shared (e.g. network home directory).

Another example are new extensions.  OpenSSH now has some
platform-independent keychain support (although the only implementation
is currently on Mac OS X).  There is no option to disable that support
for certain hosts or globally.  Such an option cannot be added without
making it impossible to share an ssh_config with older versions of
OpenSSH or platforms without keychain support.

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https://bugzilla.mindrot.org/show_bug.cgi?id=1529





--- Comment #1 from nectar at apple.com  2008-10-03 10:35:33 ---
Perhaps there should be some way to annotate ?non-critical? options
that would not cause OpenSSH to barf if they were not understood, or a
way to annotate minimum version required.  Folks who do not share
configuration files can ignore the existence of such annotations.

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