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[2001:985:d55d::438]) by smtp.gmail.com with ESMTPSA id p1sm1925884ejg.10.2019.10.07.10.09.42 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 07 Oct 2019 10:09:43 -0700 (PDT) Date: Mon, 7 Oct 2019 19:09:41 +0200 From: Dominick Grift To: Ian Pilcher , selinux@vger.kernel.org, Systemd Subject: Re: [systemd SELinux] system status permission Message-ID: <20191007170941.GD1088825@brutus.lan> Mail-Followup-To: Ian Pilcher , selinux@vger.kernel.org, Systemd References: <20191007165157.GC1088825@brutus.lan> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="kvUQC+jR9YzypDnK" Content-Disposition: inline In-Reply-To: <20191007165157.GC1088825@brutus.lan> User-Agent: Every email client sucks, this one just sucks less. X-PGP-Key: https://sks-keyservers.net/pks/lookup?op=get&search=0x3B6C5F1D2C7B6B02 Sender: selinux-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: selinux@vger.kernel.org --kvUQC+jR9YzypDnK Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Mon, Oct 07, 2019 at 06:51:57PM +0200, Dominick Grift wrote: > On Mon, Oct 07, 2019 at 11:03:44AM -0500, Ian Pilcher wrote: > > I am hitting this (non-fatal) denial when reloading a service via the > > systemd dbus API: > >=20 > > > type=3DUSER_AVC msg=3Daudit(1570462081.809:743): pid=3D1 uid=3D0 > > > auid=3D4294967295 ses=3D4294967295 subj=3Dsystem_u:system_r:init_t:s0 > > > msg=3D'avc: denied { status } for auid=3Dn/a uid=3D0 gid=3D1001 > > > cmdline=3D"/usr/bin/python2 /usr/local/bin/test.py" > > > scontext=3Dsystem_u:system_r:denatc_t:s0 > > > tcontext=3Dsystem_u:system_r:init_t:s0 tclass=3Dsystem > > > exe=3D"/usr/lib/systemd/systemd" sauid=3D0 hostname=3D? addr=3D? term= inal=3D?' > > https://selinuxproject.org/page/NB_ObjectClassesPermissions defines this > > permission as "Get system status information," which isn't particularly > > helpful. > >=20 > > Ultimately, I need to decide whether to allow or "dontaudit" this > > denial, so any information/pointers on what systemd is doing here and > > what functionality I will lose if I dontaudit this denial would be > > appreciated. >=20 > Not sure but this is my best bet: >=20 > Generally, i think, its about "getting" information from systemd1, as opp= osed to setting things. >=20 > Stuff like: introspection, getting info about objects it manages, about i= t's properties. >=20 > Theres a lot of "status information" to be gotten I guess. Introspect sys= temd1 to see what all is there. >=20 > But if you reload a unit, I gather, you might get some status information= about it from systemd1. >=20 > I guess you can probably see the methods that are being invoked if you se= t the systemd loglevel to debug >=20 > systemd-analyze log-level debug && systemctl reload foo && journalctl -rb I tried it out with simple `systemctl status` Oct 07 19:04:21 myguest systemd[1]: Sent message type=3Dmethod_return sende= r=3Dorg.freedesktop.systemd1 destination=3Dn/a path=3Dn/a interface=3Dn/a m= ember=3Dn/a cookie=3D1 reply_cookie=3D1 signature=3Da{sv} error-name=3Dn/a = error-message=3Dn/a Oct 07 19:04:21 myguest systemd[1]: SELinux access check scon=3Dwheel.id:sy= sadm.role:systemctl.sysadm.subj:s0 tcon=3Dsys.id:sys.role:systemd.system.su= bj:s0 tclass=3Dsystem perm=3Dstatus path=3D(null) cmdline=3D: 0 Oct 07 19:04:21 myguest systemd[1]: Got message type=3Dmethod_call sender= =3Dn/a destination=3Dorg.freedesktop.systemd1 path=3D/org/freedesktop/syste= md1 interface=3Dorg.freedesktop.DBus.Properties member=3DGetAll cookie=3D1 = reply_cookie=3D0 signature=3Ds error-name=3Dn/a error-message=3Dn/a So the method "get all properties from systemd1" was called by running that= , and that triggered a "system status" check >=20 > >=20 > > Thanks! > >=20 > > --=20 > > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D > > Ian Pilcher arequipeno@gmail.com > > -------- "I grew up before Mark Zuckerberg invented friendship" -------- > > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D >=20 > --=20 > Key fingerprint =3D 5F4D 3CDB D3F8 3652 FBD8 02D5 3B6C 5F1D 2C7B 6B02 > https://sks-keyservers.net/pks/lookup?op=3Dget&search=3D0x3B6C5F1D2C7B6B02 > Dominick Grift --=20 Key fingerprint =3D 5F4D 3CDB D3F8 3652 FBD8 02D5 3B6C 5F1D 2C7B 6B02 https://sks-keyservers.net/pks/lookup?op=3Dget&search=3D0x3B6C5F1D2C7B6B02 Dominick Grift --kvUQC+jR9YzypDnK Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQGzBAEBCAAdFiEEujmXliIBLFTc2Y4AJXSOVTf5R2kFAl2bcVEACgkQJXSOVTf5 R2kotQv/W8AwOh1vheEeedJtD+QCoQ2OXwOzRo73WWREa1kbA+bEAdjk0B9or/kA /khdn5hqcVr4OXxAYdf8lXt3phlplNVtIGR3F354UkCLU36VKO/6T0C0zdB8HaGD irF/KpL1cfHBs+XXOJPmtz6Tu0VTeSF3oDO12up4SI9VAKnfWu1mNMtNNRn7t7rN oh0/5EKWpHLNZL+ldsJPg6MR1rNuWu0crLJiA0h9WwvfIrPlRG1wJLL3lb1QGLgs L+0TIpJqswrOp+SZmYMMvCkvhIpGWhwSQjgd1NsGZsADS0VJb7PVXOmSoZFkwB8k nXOV7mlSsdbl97z5voST7sptl+XrX/hkM/lVJOmfx0soCKmVtg5Kgdf2NykMAmc7 Jtw/u9C3OuKqIcThHZb4QyFNWGtF6+ElBiRHkhQAFZQ23JOcZvggq33I7YzEd4yL LbBq2oWNDN32vuqu++PkHJVKoWb6A7gdb71ybmWOjMdhNeLAztxFchEBnIf2lAM9 i3GTx2LG =eGTM -----END PGP SIGNATURE----- --kvUQC+jR9YzypDnK--