rsync support in authprogs - feedback requested

Kevin Korb kmk at
Thu Feb 18 17:22:33 UTC 2021

You should both look into rrsync.  It comes with rsync and is designed
to do exactly this.  Unfortunately some Linux distros are maintained by
insane people who install rrsync as if it was documentation (compressed
and not executable) instead of a helper script which is what it is.

On 2/18/21 10:28 AM, Karl O. Pinc via rsync wrote:
> On Wed, 17 Feb 2021 21:52:06 -0800
> Bri Hatch via rsync <rsync at> wrote:
>> I recently added initial rsync support to authprogs.
>> I'd be very interested in feedback 
> For some 15 years+ (?) I've had a /root/.ssh/authorized keys line
> that starts with:
> "no-pty,no-agent-forwarding,no-port-forwarding,no-user-rc,no-X11-forwarding,command="rsync --server --daemon ."
> Occasionally I frob the ssh restrictions as new ones are
> introduced.
> The remote end uses rsync to backup (with --link-dest) the
> entire file system.  The idea (iirc) was to restrict
> the given key so that it would only run rsync.
> And I think this also forces the local end to use
> /etc/rsyncd.conf, where there's an additional layer
> of security via a secrets file and read-only can
> be set to provide some control.
> The remote end always runs rsync -- the direction of 
> transfer is static, per-host-pair, but can be either
> in or out. (Push or pull backups.) The above authorized_keys 
> line does not enforce direction, which might be useful.
> I only rarely think about tweaking the authorized_keys line, 
> and the rsync options used haven't changed since I got them to work.
> Without really thinking about it it seems that your
> authprogs development might be useful.  
> My purpose with this email is to let you do all the 
> thinking and tell me of all the wonderful utility
> your authprogs work can provides, either now or
> in the future.  ;-)  Or at least give you some
> background in case you want to develop in a direction
> that you think would helpful to me.  If something comes
> of this I might even turn my brain on again and
> modify my systems.  :)
> Regards,
> Karl <kop at>
> Free Software:  "You don't pay back, you pay forward."
>                  -- Robert A. Heinlein

	Kevin Korb			Phone:    (407) 252-6853
	Systems Administrator		Internet:
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	Orlando, Florida		kmk at (personal)
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