ssh ProxyJump has liftoff

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If you have:

intertubes ~~ (my so called life in the...) DMZ ~~~ some top secret lab

And you can go from the DMZ to the internet… and to the lab… but you can’t escape to the internet from the lab…

You need a jump server!

SSH added a -j option in version 7.3, along with a matching configuration option called ProxyJump.

You can set up a hostname configuration to jump directly from lab to internet (home of AWS btw):

  • configure a host shortcutAwsInstancefrom dmz to internet
  • configure a host shortcutDmzHostfrom lab to dmx
  • configure a host shortcutAwsInstanceJumpfrom lab to internet, with ProxyJump DmzHost

I had to set up an sshd server using Cygwin on my Windows lappie in the dmz – it was all shiny and modern and had ProxyJump capability.

I had to bump up all my crusty old Ubuntu 16.04 boxes (2016 is so yesterday) to get from ssh 7.2 to 7.4.  Good to go!

See the wiki for the latest instructions.

Comments | Thursday, August 31, 2017    [ * * * * ]

Java’s solution to the problem of C++ allowing you to blow your foot off was to chop off your legs

C++ zzz Chatter

I hate it when I find myself Java bashing. It’s just a language, it has its uses. But I pretty much did a Julia Louis-Dreyfus when I read this reddit post….

Operator overloading? You might abuse it… chop. Multiple inheritance? You might abuse it… chop. Creating a new object? You’d best type the type of the object three or four times before we’ll believe that you got it right. You want access to internals, subclass the compiler objects, closures, iterators, lazy evaluation, the list goes on chop chop chop
It’s often hard to point to a language’s philosophy because it is embodied in a long sequence of little decisions that are easy to dismiss in isolation, but that’s how I see the philosophy of Java.
Of course, that didn’t work, so a large aftermarket in prostheses has sprung up, and lately the language has been sort of growing some of the power features it previously rejected, although they pretty are much bolted on. Many people have even forgotten that there is a whole world full of people who don’t get around in powered wheelchairs and don’t need machines to help them chew, and argue passionately about how much they love their Chewing Completion and Integrated Mobility Environments and how easy it is to sort of slowly shamble up stairs on these prosthetic legs (which sounds impressive after you’ve spent five years in a wheelchair), endlessly haranguing those who choose to run on their own two feet about what they are missing by not getting their legs chopped off.

Of course none of this covers the fact that Java was THE ONLY SANE WAY to write portable code for about 15 minutes during its greatest fame…

Comments | Wednesday, August 9, 2017    [ ]