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From: Paul Moore <paul@paul-moore.com>
To: Golden_Miller83@protonmail.ch
Cc: keescook@chromium.org, casey@schaufler-ca.com,
	linux-security-module@vger.kernel.org,
	James Morris <jmorris@namei.org>,
	linux-kernel@vger.kernel.org, selinux@tycho.nsa.gov,
	john.johansen@canonical.com, penguin-kernel@i-love.sakura.ne.jp,
	Stephen Smalley <sds@tycho.nsa.gov>,
	linux-fsdevel@vger.kernel.org, casey.schaufler@intel.com
Subject: Re: [PATCH 10/10] LSM: Blob sharing support for S.A.R.A and LandLock
Date: Thu, 13 Sep 2018 17:50:48 -0400	[thread overview]
Message-ID: <CAHC9VhR0qfTn3qwVGpBV=LcM8O1jz-dmqxTW0OqJ-xfO+1k6ew@mail.gmail.com> (raw)
In-Reply-To: <tb3zfQ7fac9Oth8YArOo84SbMfqV1s0DjOmVy7op90J_o1XOaEjflZloOpj9PIiUQRhKJxhauXzJD3irkSSjOXK94qYlfQ1frIQiH1OTWPQ=@protonmail.ch>

On Thu, Sep 13, 2018 at 4:58 PM Jordan Glover
<Golden_Miller83@protonmail.ch> wrote:
>
> On Thursday, September 13, 2018 9:12 PM, Paul Moore <paul@paul-moore.com> wrote:
>
> > On Thu, Sep 13, 2018 at 11:19 AM Kees Cook keescook@chromium.org wrote:
> >
> > > On Thu, Sep 13, 2018 at 6:16 AM, Paul Moore paul@paul-moore.com wrote:
> > >
> > > > On Thu, Sep 13, 2018 at 12:19 AM Kees Cook keescook@chromium.org wrote:

...

> > > > > I don't see a good reason to make this a config. Why shouldn't this
> > > > > always be enabled?
> > > >
> > > > I do. From a user perspective it is sometimes difficult to determine
> > > > the reason behind a failed operation; its is a DAC based denial, the
> > > > LSM, or some other failure? Stacking additional LSMs has the
> > > > potential to make this worse. The boot time configuration adds to the
> > > > complexity.
> > >
> > > Let me try to convince you otherwise. :) The reason I think there's no
> > > need for this is because the only functional change here is how
> > > TOMOYO gets stacked. And in my proposal, we can convert TOMOYO to be
> > > enabled/disabled like LoadPin. Given the configs I showed, stacking
> > > TOMOYO with the other major LSMs becomes a config (and/or boottime)
> > > option.
> > > The changes for TOMOYO are still needed even with SECURITY_STACKING,
> > > and I argue that the other major LSMs remain the same. It's only
> > > infrastructure that has changed. So, I think having SECURITY_STACKING
> > > actually makes things more complex internally (all the ifdefs, weird
> > > enable logic) and for distros ("what's this stacking option", etc?)
> >
> > None of the above deals with the user experience or support burden a
> > distro would have by forcing stacking on. If we make it an option the
> > distros can choose for themselves; picking a kernel build config is
> > not something new to distros, and I think Casey's text adequately
> > explains CONFIG_SECURITY_STACKING in terms that would be sufficient.
>
> CONFIG_SECURITY_STACKING doesn't make any user visible changes on
> itself as it doesn't automatically enable any new LSM. The LSM
> specific configs are place where users/distros make decisions. If
> there is only one LSM enabled to run then there's nothing to stack.
> If someone choose to run two or more LSM in config/boot cmdline
> then we can assume having it stacked is what they wanted. As Kees
> pointed there is already CONFIG_SECURITY_DEFAULT_XXX. In both cases
> CONFIG_SECURITY_STACKING is redundant and only adds burden instead
> of removing it.

See my last response to Kees.

> > I currently have a neutral stance on stacking, making it mandatory
> > pushes me more towards a "no".
>
> This implies that your real concern is something else than
> CONFIG_SECURITY_STACKING which only allows you to ignore the whole
> thing. Please reveal it. There are a lot of people waiting for LSM
> stacking which is several years late and it would be great to
> resolve potential issues earlier  rather later.

What?  I resent the implication that I'm hiding anything; there are a
lot of fair criticisms you could level at me, but I take offense at
the idea that I'm not being honest here.  I've been speaking with
Casey, John, and others about stacking for years, both on-list and
in-person at conferences, and my
neutral-opinion-just-make-it-work-for-everything-and-make-it-optional
stance has been pretty consistent and isn't new.

Also, let's be really clear here: I'm only asking that stacking be
made a build time option (as it is in Casey's patchset).  That seems
like a pretty modest ask for something so significant and "several
years late" as you put it.

-- 
paul moore
www.paul-moore.com

  reply	other threads:[~2018-09-14  3:02 UTC|newest]

Thread overview: 56+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-09-11 16:26 [PATCH v2 00/10] LSM: Module stacking in support of S.A.R.A and Landlock Casey Schaufler
2018-09-11 16:41 ` [PATCH 01/10] procfs: add smack subdir to attrs Casey Schaufler
2018-09-12 22:57   ` Kees Cook
2018-09-11 16:41 ` [PATCH 02/10] Smack: Abstract use of cred security blob Casey Schaufler
2018-09-12 23:04   ` Kees Cook
2018-09-11 16:41 ` [PATCH 03/10] SELinux: " Casey Schaufler
2018-09-12 23:10   ` Kees Cook
2018-09-11 16:41 ` [PATCH 04/10] LSM: Infrastructure management of the " Casey Schaufler
2018-09-12 23:53   ` Kees Cook
2018-09-13 19:01     ` Casey Schaufler
2018-09-13 21:12       ` Kees Cook
2018-09-11 16:41 ` [PATCH 05/10] SELinux: Abstract use of file " Casey Schaufler
2018-09-12 23:54   ` Kees Cook
2018-09-11 16:42 ` [PATCH 06/10] LSM: Infrastructure management of the " Casey Schaufler
2018-09-13  0:00   ` Kees Cook
2018-09-11 16:42 ` [PATCH 07/10] SELinux: Abstract use of inode " Casey Schaufler
2018-09-13  0:23   ` Kees Cook
2018-09-11 16:42 ` [PATCH 08/10] Smack: " Casey Schaufler
2018-09-13  0:24   ` Kees Cook
2018-09-11 16:42 ` [PATCH 09/10] LSM: Infrastructure management of the inode security Casey Schaufler
2018-09-13  0:30   ` Kees Cook
2018-09-11 16:42 ` [PATCH 10/10] LSM: Blob sharing support for S.A.R.A and LandLock Casey Schaufler
2018-09-13  4:19   ` Kees Cook
2018-09-13 13:16     ` Paul Moore
2018-09-13 15:19       ` Kees Cook
2018-09-13 19:12         ` Paul Moore
2018-09-13 20:58           ` Jordan Glover
2018-09-13 21:50             ` Paul Moore [this message]
2018-09-13 22:04               ` Jordan Glover
2018-09-13 23:01               ` Casey Schaufler
2018-09-13 21:01           ` Kees Cook
2018-09-13 21:38             ` Paul Moore
2018-09-13 21:51               ` Kees Cook
2018-09-13 23:06                 ` Kees Cook
2018-09-13 23:32                   ` John Johansen
2018-09-13 23:51                     ` Kees Cook
2018-09-14  0:03                       ` Casey Schaufler
2018-09-14  0:06                         ` Kees Cook
2018-09-13 23:51                   ` Casey Schaufler
2018-09-13 23:57                     ` Kees Cook
2018-09-14  0:08                       ` Casey Schaufler
2018-09-14  0:19                         ` Kees Cook
2018-09-14 15:57                           ` Casey Schaufler
2018-09-14 20:05                             ` Kees Cook
2018-09-14 20:47                               ` Casey Schaufler
2018-09-14 18:18                         ` James Morris
2018-09-14 18:23                           ` John Johansen
2018-09-14  0:03                     ` Kees Cook
2018-09-14  2:42                 ` Paul Moore
2018-09-11 20:43 ` [PATCH v2 00/10] LSM: Module stacking in support of S.A.R.A and Landlock James Morris
2018-09-12 21:29 ` James Morris
2018-09-16 16:54   ` Salvatore Mesoraca
2018-09-16 17:25     ` Casey Schaufler
2018-09-16 17:45       ` Salvatore Mesoraca
2018-09-18  7:44   ` Mickaël Salaün
2018-09-18 15:23     ` Casey Schaufler

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