Re: [External] Re: SELinux support question

[Anton Kachalov <rnouse@google.com>]

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Hello, Ivan.

I'm unsure how policies are being built in Yocto. Usually, you should have
/etc/selinux populated in your image with precompiled policies. At least,
some default ones.

On Fri, 6 Nov 2020 at 11:06, Ivan Li11 <rli11@lenovo.com> wrote:

> Hi Anton and Jayanth,
>
>
>
> Thanks your suggestion, it’s workable to get correct status after adding
> “selinux” to systemd bbappened file.
>
>
>
> BTW,  may I check with you what does “precompiled policies under
> /etc/selinux” mean ?
>
> Does it mean that I need to add “PREFERRED_PROVIDER_virtual/refpolicy =
> "refpolicy-minimum"” to build/conf/local.conf file to assign policy in
> advance ?
>
>
>
> Thanks,
>
> Ivan
>
> *From:* Jayanth Othayoth <ojayanth@gmail.com>
> *Sent:* Thursday, November 5, 2020 3:37 PM
> *To:* Anton Kachalov <rnouse@google.com>
> *Cc:* Ivan Li11 <rli11@lenovo.com>; Andrew Jeffery <andrew@aj.id.au>;
> openbmc@lists.ozlabs.org; Artem Senichev <artemsen@gmail.com>
> *Subject:* Re: [External] Re: SELinux support question
>
>
>
>
>
> I tried on one of the IBM box which got 32MB flash in 2018 time frame and
> was able to got BMC read state . Reference patch (POC only) is available
> here
>
>
>
>
> https://gerrit.openbmc-project.xyz/q/topic:%22selinux%22+(status:open%20OR%20status:merged)
>
>
>
> On Wed, Nov 4, 2020 at 8:06 PM Anton Kachalov <rnouse@google.com> wrote:
>
> Hello, Ivan.
>
>
>
> Please check if the systemd has been compiled with selinux feature
> enabled. It should be in charge of enforcing selinux rules at boot.
>
>
>
> You should add "selinux" to PACKAGECONFIG over here:
>
>
> https://github.com/openbmc/openbmc/blob/master/meta-phosphor/recipes-core/systemd/systemd_%25.bbappend#L4
>
>
>
> As well as adding "selinux" to the DISTRO_FEATURES variable in your
> build/conf/local.conf file.
>
>
>
> Do you have precompiled policies under /etc/selinux ?
>
>
>
> If it still doesn't work, please also attach a boot log.
>
>
>
>
>
> On Tue, 3 Nov 2020 at 18:52, Ivan Li11 <rli11@lenovo.com> wrote:
>
> Hi Anton,
>
>
>
> Thanks your help and support.
>
> I’ve followed your suggestion to enable selinux kernel configuration and
> have seen kernel message “[ 0.002268] SELinux:  Initializing.” during boot
> time, but still returns “Disabled” after executing getenforce command.
>
> The selinux mode and type I set in /etc/selinux/config file is permissive
> and minimum.  Could you help to advise me whether there’s some settings
> need to set to avoid this problem.
>
>
>
> Thanks,
>
> Ivan
>
> *From:* Anton Kachalov <rnouse@google.com>
> *Sent:* Tuesday, November 3, 2020 3:50 AM
> *To:* Ivan Li11 <rli11@lenovo.com>
> *Cc:* Andrew Jeffery <andrew@aj.id.au>; Artem Senichev <artemsen@gmail.com>;
> openbmc@lists.ozlabs.org
> *Subject:* Re: [External] Re: SELinux support question
>
>
>
> Hello, Ivan.
>
>
>
> Perhaps, you should enable selinux kernel configuration as well. The
> openbmc kernels, if I'm not mistaken, have different recipes.
>
>
>
> The default configuration relies on linux-yocto package:
>
>
> http://git.yoctoproject.org/cgit/cgit.cgi/meta-selinux/tree/recipes-kernel/linux
>
>
>
> You should include this selinux.cfg in on of the openbmc kernel layers:
>
>
>
> SRC_URI += "file://selinux.cfg"
>
>
>
> and copy selinux.cfg to one of the local files location.
>
>
>
> On Mon, 2 Nov 2020 at 18:46, Ivan Li11 <rli11@lenovo.com> wrote:
>
>
> > -----Original Message-----
> > From: Andrew Jeffery <andrew@aj.id.au>
> > Sent: Monday, November 2, 2020 8:54 AM
> > To: Artem Senichev <artemsen@gmail.com>; Ivan Li11 <rli11@lenovo.com>
> > Cc: openbmc@lists.ozlabs.org
> > Subject: [External] Re: SELinux support question
> >
> >
> >
> > On Fri, 30 Oct 2020, at 16:25, Artem Senichev wrote:
> > > Hi Ivan,
> > >
> > > Yocto has a layer for SELinux
> > > (http://git.yoctoproject.org/cgit/cgit.cgi/meta-selinux), you can try
> > > it.
> > > But the layer depends on Python for management tools, which does not
> > > exist in the OpenBMC image anymore.
> > > The problem is that Python significantly increases image size, it will
> > > be more than 32MiB, which causes some troubles with qemu emulation.
> >
> > The problem is broader than qemu though, it would also be broken on any
> > platform shipping a 32MiB flash part if the image exceeds 32MiB.
> >
> > That said, if there are systems that ship bigger parts and enabling
> SELinux for
> > those is feasible, we should add those platform models to qemu so
> emulating
> > them isn't constrained by the existing platform support.
> >
> > Andrew
>
> Hi Andrew and Artem,
> Per your suggestion, I try to enable SELinux with Yocto SELinux layer(
> http://git.yoctoproject.org/cgit/cgit.cgi/meta-selinux) and 64MiB flash
> part.
> But encountered one problem which is when I use command "getenforce" to
> check SELinux mode, it always returns "Disabled" even if SELinux mode in
> config file '/etc/selinux/config' is permissive or enforcing by default.
>
> Please help to advise it.
>
>

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