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Date: Sun, 26 Aug 2018 14:54:06 +0000
From: Jeremy Stanley <fungi@...goth.org>
To: oss-security@...ts.openwall.com
Subject: Re: Travis CI MITM RCE

On 2018-08-25 20:56:59 -0400 (-0400), Phil Pennock wrote:
> On 2018-08-25 at 23:49 +0200, Jakub Wilk wrote:
> > The new code looks like this:
> > 
> >    apt-key list | awk -F'[ /]+' '/expired:/{printf "apt-key adv --recv-keys --keyserver keys.gnupg.net %s\\n", $3}' | sudo sh
> ...
> >   $ apt-key list | grep -A1 -w A15703C6
> >   pub   4096R/A15703C6 2016-01-11 [expires: 2020-01-05]
> >   uid                  MongoDB 3.4 Release Signing Key <packaging@...godb.com>
[...]
> If you're building infrastructure which needs to get data from off-site,
> then consider whether or not you can provide template directives which
> people can include in their command lists, and you then populate the
> template with the correct current commands for that directive.  Eg, if
> I'm talking to Docker inside Circle CI, I don't set a bunch of variables
> myself, I just say `setup_remote_docker` and let Circle CI figure out
> which commands should be run.  For "everything is a shell command"
> setup, then perhaps `$CICMD_APT_KEYS_UPDATE` could be made available.
> Or `"${CICMD_APT_KEYS_UPDATE[@]}"` if even more constrained.

Indeed, as someone who helps design and run very large CI systems, I
can say with certainty that every extra request you make in your
jobs to retrieve something over a network connection is one more
false negative failure waiting to happen. The Internet is _not_
reliable, and it becomes obvious when you start looking at
connection failures and random API errors at scale from lots of
different places on the planet. If there's basically static data
that your job needs (especially public keys/certs) just bake it
directly into the job itself, and for things that change more often
than that cache as much of it as you can local to (or even directly
on the filesystems of) the systems which run those jobs.

Unfortunately a lot of this sort of silliness comes about because
people write CI jobs by translating their own developer environment
configuration documentation or user guides into scripts and don't
think about (or perhaps don't even understand in many cases) how
technologies like OpenPGP work.
-- 
Jeremy Stanley

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