Re: automatic creation of a chroot environment

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>It was covered already two times :]

yes,thanks. But I meant on your website,not on the FreeBSD forums.

>hope someone finds this useful.
>https://github.com/rozhuk-im/chroot_env

Hi all,

chroot_env (https://github.com/rozhuk-im/chroot_env) is a lightweight
tmpfs+chroot sandbox for FreeBSD - no jails, no ZFS, RO by default,
noexec/nosuid on anything writable. As the author notes, one thing it
doesn't touch is the network stack: chroot(2) gives a sandboxed process the
same network access as its user has on the host.

I've added an opt-in network ACL that closes this gap without pulling in
jails or VNET:

- CHROOT_APP_PF_RULES: pf.conf-syntax rules loaded into a per-app anchor
(pfctl -a chroot_env/${CHROOT_USER} -f -). The script appends a deny-all
scoped to CHROOT_USER after your rules, so anything not explicitly passed
is blocked. The only one-time setup is a single "anchor \"chroot_env/*\""
line in the host pf.conf.
- CHROOT_PF_ANCHOR: anchor name override, same auto-default pattern already
used for CHROOT_GROUP.

It hooks into chroot_init/chroot_deinit the same way devfs rules and nullfs
maps already do, not through CHROOT_INIT_HOOK (which already owns the
default RO remount). setfib-based routing restriction and real VNET-style
isolation are out of scope by design - the script never executes the target
app, so those belong at the invocation site, not inside chroot_env.sh.
Documented, not automated.

Patch and a worked example attached (sandboxing a browser: port + PF rules
+ RW-mapped profile dir only, everything else RO/ephemeral). Syntax-checked
so far, not yet exercised against a live pf(4)/mount_nullfs/devfs setup -
testing and feedback welcome before calling it done.

Thanks,

On Thu, Jul 16, 2026 at 5:19=E2=80=AFPM vermaden <[email protected]> wrot=
e:

>
> > // Rozhuk Ivan
> > https://github.com/mpv-player/mpv/pull/18221
> > Hope it will be merged sometimes :)
>
> Nice addition, I hope so, gonna add it to VN too :)
>
>
>
> > // Mario Marietto
> > > .. and I believe this is what You are looking for:
> > > - https://forums.freebsd.org/threads/bhyve-qemu-vmm.102735/
> >
> > yes, but this wasn't included between the VN?
> > I thought that that project was enough valuable
> > / trying to understand the criteria that makes a project valuable for
> you /
>
> It was covered already two times :]
>
> | % vernews 102735
> |
> | Qemu Accelerated with <tt>bhyve_vmm</tt> for First Time on FreeBSD.
> | https://forums.freebsd.org/threads/qemu-bhyve-vmm.102735/
> |
> | QEMU Bhyve Enabled Performance Comparison.
> | https://forums.freebsd.org/threads/qemu-bhyve.102735/page-2#post-763082
> |
> | % which vernews
> | vernews: aliased to find ~/misc/verblog/NEWS -name post.txt -print0 |
> xargs -0 -n1 grep -i -B 2 -A 1
>
> ... and this QEMU/Bhyve/VMM project is VERY valuable for me because of
> these reasons:
> -
> https://forums.freebsd.org/threads/qemu-bhyve-vmm.102735/page-2#post-7614=
21
> -
> https://forums.freebsd.org/threads/qemu-bhyve-vmm.102735/page-2#post-7614=
58
>
>
>
> Hope that helps.
>
> Regards,
> vermaden
>


--=20
Mario.

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<div dir=3D"ltr"><div><span class=3D"gmail-im">&gt;</span>It was covered al=
ready two times :]</div><div><br></div><div>yes,thanks. But I meant on your=
 website,not on the FreeBSD forums.</div><div><br></div><div>&gt;hope someo=
ne finds this useful.<br>&gt;<a href=3D"https://github.com/rozhuk-im/chroot=
_env" rel=3D"noreferrer" target=3D"_blank">https://github.com/rozhuk-im/chr=
oot_env</a></div><div><br></div><div>Hi all,</div><br>chroot_env (<a href=
=3D"https://github.com/rozhuk-im/chroot_env">https://github.com/rozhuk-im/c=
hroot_env</a>) is a lightweight tmpfs+chroot sandbox for FreeBSD - no jails=
, no ZFS, RO by default, noexec/nosuid on anything writable. As the author =
notes, one thing it doesn&#39;t touch is the network stack: chroot(2) gives=
 a sandboxed process the same network access as its user has on the host.<b=
r><br>I&#39;ve added an opt-in network ACL that closes this gap without pul=
ling in jails or VNET:<br><br>- CHROOT_APP_PF_RULES: pf.conf-syntax rules l=
oaded into a per-app anchor (pfctl -a chroot_env/${CHROOT_USER} -f -). The =
script appends a deny-all scoped to CHROOT_USER after your rules, so anythi=
ng not explicitly passed is blocked. The only one-time setup is a single &q=
uot;anchor \&quot;chroot_env/*\&quot;&quot; line in the host pf.conf.<br>- =
CHROOT_PF_ANCHOR: anchor name override, same auto-default pattern already u=
sed for CHROOT_GROUP.<br><br>It hooks into chroot_init/chroot_deinit the sa=
me way devfs rules and nullfs maps already do, not through CHROOT_INIT_HOOK=
 (which already owns the default RO remount). setfib-based routing restrict=
ion and real VNET-style isolation are out of scope by design - the script n=
ever executes the target app, so those belong at the invocation site, not i=
nside chroot_env.sh. Documented, not automated.<br><br>Patch and a worked e=
xample attached (sandboxing a browser: port + PF rules + RW-mapped profile =
dir only, everything else RO/ephemeral). Syntax-checked so far, not yet exe=
rcised against a live pf(4)/mount_nullfs/devfs setup - testing and feedback=
 welcome before calling it done.<br><br>Thanks,</div><br><div class=3D"gmai=
l_quote gmail_quote_container"><div dir=3D"ltr" class=3D"gmail_attr">On Thu=
, Jul 16, 2026 at 5:19=E2=80=AFPM vermaden &lt;<a href=3D"mailto:vermaden@i=
nteria.pl">[email protected]</a>&gt; wrote:<br></div><blockquote class=3D=
"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(2=
04,204,204);padding-left:1ex"><br>
&gt; // Rozhuk Ivan<br>
&gt; <a href=3D"https://github.com/mpv-player/mpv/pull/18221" rel=3D"norefe=
rrer" target=3D"_blank">https://github.com/mpv-player/mpv/pull/18221</a><br=
>
&gt; Hope it will be merged sometimes :)<br>
<br>
Nice addition, I hope so, gonna add it to VN too :)<br>
<br>
<br>
<br>
&gt; // Mario Marietto<br>
&gt; &gt; .. and I believe this is what You are looking for:<br>
&gt; &gt; - <a href=3D"https://forums.freebsd.org/threads/bhyve-qemu-vmm.10=
2735/" rel=3D"noreferrer" target=3D"_blank">https://forums.freebsd.org/thre=
ads/bhyve-qemu-vmm.102735/</a><br>
&gt; <br>
&gt; yes, but this wasn&#39;t included between the VN?<br>
&gt; I thought that that project was enough valuable<br>
&gt; / trying to understand the criteria that makes a project valuable for =
you /<br>
<br>
It was covered already two times :]<br>
<br>
| % vernews 102735=C2=A0 =C2=A0<br>
| <br>
| Qemu Accelerated with &lt;tt&gt;bhyve_vmm&lt;/tt&gt; for First Time on Fr=
eeBSD.<br>
| <a href=3D"https://forums.freebsd.org/threads/qemu-bhyve-vmm.102735/" rel=
=3D"noreferrer" target=3D"_blank">https://forums.freebsd.org/threads/qemu-b=
hyve-vmm.102735/</a><br>
| <br>
| QEMU Bhyve Enabled Performance Comparison.<br>
| <a href=3D"https://forums.freebsd.org/threads/qemu-bhyve.102735/page-2#po=
st-763082" rel=3D"noreferrer" target=3D"_blank">https://forums.freebsd.org/=
threads/qemu-bhyve.102735/page-2#post-763082</a><br>
| <br>
| % which vernews<br>
| vernews: aliased to find ~/misc/verblog/NEWS -name post.txt -print0 | xar=
gs -0 -n1 grep -i -B 2 -A 1<br>
<br>
... and this QEMU/Bhyve/VMM project is VERY valuable for me because of thes=
e reasons:<br>
- <a href=3D"https://forums.freebsd.org/threads/qemu-bhyve-vmm.102735/page-=
2#post-761421" rel=3D"noreferrer" target=3D"_blank">https://forums.freebsd.=
org/threads/qemu-bhyve-vmm.102735/page-2#post-761421</a><br>
- <a href=3D"https://forums.freebsd.org/threads/qemu-bhyve-vmm.102735/page-=
2#post-761458" rel=3D"noreferrer" target=3D"_blank">https://forums.freebsd.=
org/threads/qemu-bhyve-vmm.102735/page-2#post-761458</a><br>
<br>
<br>
<br>
Hope that helps.<br>
<br>
Regards,<br>
vermaden<br>
</blockquote></div><div><br clear=3D"all"></div><br><span class=3D"gmail_si=
gnature_prefix">-- </span><br><div dir=3D"ltr" class=3D"gmail_signature">Ma=
rio.<br></div>

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