https://bugzilla.mindrot.org/show_bug.cgi?id=1766
Summary: ssh should provide the current session configuration
to subprocesses it invokes (via the environment?)
Product: Portable OpenSSH
Version: 5.5p1
Platform: All
OS/Version: All
Status: NEW
Severity: enhancement
Priority: P2
Component: ssh
AssignedTo: unassigned-b...@mindrot.org
ReportedBy: d...@fifthhorseman.net
The ssh client currently has a few subprocesses that it might invoke.
For example, ProxyCommand and LocalCommand.
Those processes are invoked without any knowledge of the configuration
of the ssh session being invoked, but some commands might alter their
behavior based on the ssh configuration.
My proposal is for ssh to export its current configuration to the
environment established for the invoked subcommand. So the child
process could (for example) examine ${OpenSSH_hashknownhosts} to decide
how to update a known_hosts file.
This is similarly useful to sshd's -C and -T options (though the
mechanism is different, of course) -- so aligned tools don't need to
re-implement (or track) OpenSSH's config file parsing code.
One way to approach this would be to allow something similar to -C -T,
but for the client configs instead of the server configs. However,
this solution wouldn't address a situation where a user had invoked ssh
like:
ssh -oHashKnownHosts=no -oLocalCommand=whatever u...@host
(that is, the "whatever" command couldn't determine that HashKnownHosts
was "no" for this session just by parsing the client configs).
Is this something that seems like it would be useful to other people?
I'm willing to work on a patch.
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