On Fri, 22 Sep 2017 13:03:07 +0200, Arnt wrote in message <20170922130307.25f57...@nb6.lan>:
> On Thu, 21 Sep 2017 16:44:47 -0700, Rick wrote in message > <20170921234447.gp11...@linuxmafia.com>: > > > Quoting Arnt Karlsen (a...@iaksess.no): > > > > > ..my prefecence was the -X option: ssh -X root@localhost > > > until Debian killed it with some new policy. > > > > Was it Debian that did that? I was never sure. I just remember > > that 'ssh -X' suddenly no longer did X11 forwarding as it used to, > > but I looked up the problem and saw that 'ssh -Y' now did that. I > > never chased down the matter further. > > ..hum, agreed, one of us should have. > > > (/me Web-searches:) > > > > It has something to do with 'untrusted X11', mentioned in passing > > here: > > https://unix.stackexchange.com/questions/12755/how-to-forward-x-over-ssh-to-run-graphics-applications-remotely > > > > -Y 'enables trusted X11 forwarding': > > > > https://serverfault.com/questions/273847/what-does-warning-untrusted-x11-forwarding-setup-failed-xauth-key-data-not-ge > > > > "Untrusted" in this context means you don't trust the connection. > > SSH will use additional security measures to try to make X11 > > forwarding safer. "Trusted" means you are entirely confident that no > > on on the remote host will get access to your Xauth data and use it > > to monitor your keystrokes for instance. > > > > This terminology actually confused me for years. I thought > > "Trusted" connections were safer. But actually it's an option > > you're supposed to use in situations where the connection IS > > trustworthy and you want to run stuff without extra security > > measures getting in your way. "Untrusted" is the one that makes it > > (somewhat) safer to deal with an untrusted remote host. > > > > An "Untrusted" connection attempts to limit what a black hat could > > do to you by engaging the X11 security extension and disabling other > > extensions that you (hopefully) don't need. This is probably why > > RandR is disabled with -X. Do you need to be able to rotate your X > > display from the remote host? > > ..not really, I would possibly "need" gradual rotations controlled > by an head tracker for use in FlightGear or flying fpv with one of > these: ..http://headplay.com/ , which should have been appended to the above colon. ..weird net "outage", I had dns, icmp and _nothing_ else, outside my isp's net. > > > It's also important to note that "untrusted" X11 forwarding turns > > off after a certain amount of time to keep you from accidentally > > leaving it on. New attempts to open windows will just fail after > > that. That bit me several times before I read enough docs to > > understand what was happening. > > ..if you use passwd-free ssh authorisation, it's simply another > [arrow-up] hit and you're back in. > > > My surmise is, not a Debian change, so much as a Portable OpenSSH > > change. > > > > _______________________________________________ > > Dng mailing list > > Dng@lists.dyne.org > > https://mailinglists.dyne.org/cgi-bin/mailman/listinfo/dng > > -- ..med vennlig hilsen = with Kind Regards from Arnt Karlsen ...with a number of polar bear hunters in his ancestry... Scenarios always come in sets of three: best case, worst case, and just in case. _______________________________________________ Dng mailing list Dng@lists.dyne.org https://mailinglists.dyne.org/cgi-bin/mailman/listinfo/dng
