On Sun, 25 Apr 2021 at 17:53, Chris Cowan via rsync
<rsync@lists.samba.org> wrote:
>
> I’ve also been looking at several solutions that try to sandbox
> openssh/rsync. These include rssh (which should not be used anymore,
> because it's Abandon-ware. But, it is what I am most familiar with), GNU
> rush, and daethnir/authprogs on github. None of these seems to be able to
> provide me the control, with rsync, when –protect-args is used. Unless I’m
> mistaken, the filtering has to be done by the rsync --server --sender process
> itself, since it's the only thing that has visibility to the filepath passed
> in the ssh channel.
I like to use rsync in daemon mode over ssh for that type of thing, because:
* you don't need a shim, just make the ssh forced command "rsync
--server --daemon --config /path/to/some/rsyncd.conf ."
* the --daemon turns on extra server side security checks
* you always have --protect-args when in daemon mode
* you can sandbox the transfer root and other things with settings in
the rsyncd.conf
Example rsync.conf for allowing reading of /var/lib/{foo,bar} but
writes to only /var/lib/foo :
use chroot = no
[foo]
path = /var/lib/foo
read only = no
[bar]
path = /var/lib/bar
read only = yes
On the client side you use the :: syntax to specify a module in an
rsync daemon along with "-e ssh" to get daemon mode over ssh, for
example to write to /var/lib/foo/someplace you could:
rsync -e ssh [OTHER OPTIONS] /tmp/new-foo-things ${hostname}::foo/someplace
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