mirror of
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feat(full): improve systemd profile.
See https://apparmor.pujol.io/development/structure/#full-system-policy
This commit is contained in:
Alexandre Pujol
parent
d64ef39bd1
commit
59140f5411
@ -1,235 +1,227 @@
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# full-apparmor-policy
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# Full System MAC Policy using AppArmor
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#
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# Copyright (c) 2023 monsieuremre <https://github.com/monsieuremre>
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#
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# This file is part of full-apparmor-policy. You can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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# apparmor.d - Full set of apparmor profiles
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# Copyright (C) 2023 Alexandre Pujol <alexandre@pujol.io>
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# Copyright (C) 2023 monsieuremre <https://github.com/monsieuremre>
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# SPDX-License-Identifier: GPL-2.0-only
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# Profile for systemd (PID 1), it does not specify an attachment path because
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# it is directly loaded by systemd.
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# Only use this profile with a fully configured system. Otherwise it **WILL**
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# break your computer. See https://apparmor.pujol.io/development/structure/#full-system-policy.
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# Distributions and other programs can add rules in the usr/systemd.d directory
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# Note: A non negligible part of the rules are due to stacked profile and unified systemd/systemd-user
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abi <abi/3.0>,
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include <tunables/global>
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profile systemd @{lib}/systemd/** flags=(attach_disconnected) {
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profile systemd flags=(attach_disconnected) {
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include <abstractions/base>
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include <abstractions/audio>
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include <abstractions/authentication>
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include <abstractions/dbus-session>
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include <abstractions/dbus-strict>
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include <abstractions/dconf-write>
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include <abstractions/dri-common>
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include <abstractions/dri-enumerate>
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include <abstractions/fonts>
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include <abstractions/mesa>
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include <abstractions/nameservice-strict>
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include <abstractions/openssl>
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include <abstractions/ssl_certs>
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include <abstractions/video>
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include <abstractions/wutmp>
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## Section 1 - Non-file related permissions
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capability audit_read, # can be phased out?
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# Needed by systemd
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capability audit_read,
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capability audit_write,
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capability bpf,
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capability chown,
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capability dac_override,
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capability dac_read_search,
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capability fowner,
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capability sys_admin,
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# The following is needed by desktop environments
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# If on gnome, these can be phased out because the DE components are already covered
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# with profiles. For other desktops, these have to be allowed
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capability sys_nice,
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capability kill,
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capability mknod,
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capability perfmon,
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capability sys_admin,
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capability sys_tty_config,
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capability sys_resource,
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capability sys_chroot,
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network netlink,
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network inet,
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network inet6,
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network packet,
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# network unix, # same as just allowing unix?
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# network local, # a thing?
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# Required by stacked profiles
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capability net_admin,
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capability net_bind_service,
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capability net_raw,
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capability setfcap,
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capability setgid,
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capability setpcap,
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capability setuid,
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capability sys_nice,
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capability sys_ptrace,
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capability sys_time,
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unix (accept),
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unix (connect),
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unix (send),
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unix (receive),
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ptrace (read),
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dbus (send),
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dbus (receive),
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dbus (bind),
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signal (send),
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signal (receive),
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network inet dgram,
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network inet raw,
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network inet stream,
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network inet6 dgram,
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network inet6 raw,
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network inet6 stream,
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network netlink raw,
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network packet dgram,
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network packet raw,
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# TODO: WIP
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mount,
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remount,
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umount,
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## Restrictions
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#
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## The following are implicitly denied with this profile. There are comments on
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## what they might break without dedicated profilesand how to address these breakages.
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#
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## mostly won't break anything with the current set of profiles
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# deny capability mknod,
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# deny capability setpcap,
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# deny capability checkpoint_restore,
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# deny capability audit_control,
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# deny capability net_bind_service,
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# deny capability block_suspend,
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# deny capability bpf,
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# deny capability ipc_owner,
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# deny capability sys_tty_config,
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# deny capability mac_admin, # intentional to protect policy
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# deny capability mac_override, # intentional to protect policy
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# deny capability sys_module,
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# deny capability linux_immutable,
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# deny capability lease,
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# deny capability net_broadcast,
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# deny capability perfmon,
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# deny capability sys_boot,
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# deny capability sys_pacct,
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# deny capability sys_time,
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# deny capability wake_alarm,
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# deny capability setfcap,
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#
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# deny pivot_root,
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#
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# deny unix (listen),
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# deny unix (create),
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# deny unix (getattr),
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# deny unix (setattr),
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# deny unix (setopt),
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# deny unix (getopt),
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#
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# deny ptrace (trace),
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# deny ptrace (tracedby),
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# deny ptrace (readby),
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#
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# deny network bluetooth,
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# deny network alg,
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# deny network ash,
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# deny network rose,
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# deny network x25,
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# deny network ax25,
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# deny network ipx,
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# deny network netrom,
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# deny network appletalk,
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# deny network econet,
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# deny network qipcrtr,
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# deny network bridge,
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# deny network atmpvc,
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# deny network netbeui,
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# deny network security,
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# deny network key,
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# deny network atmsvc,
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# deny network rds,
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# deny network irda,
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# deny network pppox,
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# deny network wanpipe,
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# deny network ib,
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# deny network mpls,
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# deny network can,
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# deny network tipc,
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# deny network rxrpc,
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# deny network isdn,
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# deny network phonet,
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# deny network ieee802154,
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# deny network caif,
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# deny network vsock,
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# deny network kcm,
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# deny network smc,
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# deny network xdp,
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#
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## will break firewalls with no profile, use firewalld as profile provided
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# deny capability net_raw,
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# deny capability net_admin,
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#
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## might break some desktop components without profile, won't brake on gnome or kde
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# deny capability ipc_lock,
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#
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## might break if you use utilities that don't have profiles (unlikely)
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# deny capability sys_rawio,
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# deny capability fsetid,
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#
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## will break electron apps without profiles, which the most common ones have here
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## might also break sandboxing utils if they don't have profiles, which the most common ones have here
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# deny capability sys_resource,
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# deny capability sys_chroot,
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#
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## most anything is covered with profiles, but some niche custom utils
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## or replacements or rewrites or very specific things can (probably won't) break
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## in that case it is worth making a profile request.
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# deny capability setgid,
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# deny capability setuid,
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pivot_root @{run}/systemd/mount-rootfs/ -> @{run}/systemd/mount-rootfs/,
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change_profile,
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# -----
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signal (receive) set=(term, hup, cont),
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signal (send),
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## Section 2 - File permissions
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ptrace (read, readby),
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## This is quite restrictive for a "general" profile.
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## Can of course be further restricted. Probably by a lot.
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unix (send) type=dgram,
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dbus, # TODO: WIP
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dbus bind bus=system name=org.freedesktop.systemd1,
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@{bin}/{,u}mount rix,
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@{bin}/ldconfig rPx -> ldconfig.service,
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@{bin}/chgrp rPx -> dmesg.service,
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@{bin}/chmod rPx -> dmesg.service,
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@{bin}/savelog rPx -> dmesg.service,
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audit @{lib}/** Pix,
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audit @{bin}/** Pix,
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audit /etc/init.d/* PUx,
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@{bin}/pipewire rPx -> systemd//&pipewire,
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@{bin}/pipewire-media-session rPx -> systemd//&pipewire-media-session,
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@{bin}/pipewire-pulse rPx -> systemd//&pipewire-pulse,
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@{bin}/pulseaudio rPx -> systemd//&pulseaudio,
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@{bin}/wireplumber rPx -> systemd//&wireplumber,
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@{lib}/{,polkit-1/}polkitd rPx -> systemd//&polkitd,
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@{lib}/snapd/snapd-apparmor rPx,
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# @{lib}/systemd/systemd rPx -> systemd-user, # FIXME: only works on server
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@{lib}/systemd/systemd-networkd rPx -> systemd//&systemd-networkd,
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@{lib}/systemd/systemd-resolved rPx -> systemd//&systemd-resolved,
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@{lib}/systemd/systemd-timesyncd rPx -> systemd//&systemd-timesyncd,
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/usr/share/apport/apport rPx,
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/usr/share/gdm/generate-config rPx,
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/usr/share/unattended-upgrades/unattended-upgrade-shutdown rPx,
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## The owner can read pretty much everything
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## He can also write to the directories
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## directly under root.
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/ r,
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owner / rwlk,
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/boot/ r,
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/boot/efi/ r,
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/efi/ r,
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/tmp/ r,
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/usr/ r,
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/var/lib/*/ r,
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/var/tmp/ r,
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@{lib}/ r,
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## Everyone can see the home directories
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## Only the owners allowed inside
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/home r,
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owner /home/** rwlkPix,
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/usr/share/** r,
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## Reserved for the owner 'root' only
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owner /boot/** rwlk,
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owner /root/** rwlk,
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/etc/binfmt.d/{,**} r,
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/etc/conf.d/{,**} r,
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/etc/credstore.encrypted/{,**} r,
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/etc/credstore/{,**} r,
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/etc/default/** r,
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/etc/environment r,
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/etc/environment.d/{,**} r,
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/etc/machine-id r,
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/etc/modules-load.d/ r,
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/etc/networkd-dispatcher/{,**} r,
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/etc/pipewire/** r,
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/etc/polkit*/** r,
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/etc/systemd/{,**} r,
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/etc/udev/hwdb.d/{,*} r,
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## Running binaries is allowed in these places
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## Modifying them requires ownership
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@{lib}/** rPix,
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owner @{lib}/** rwmlkPix,
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/var/lib/gdm{3,}/.config/pulse/{,**} rw,
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/var/lib/gdm{3,}/.config/pulse/cookie k,
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/var/lib/gdm{3,}/.config/dconf/user r,
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@{bin}/** rPix,
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owner @{bin}/** rwmlkPix,
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/var/lib/systemd/{,**} rw,
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owner /var/tmp/systemd-private-*/{,**} rw,
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/opt/** rPix,
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owner /opt/** rwmlkPix,
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@{user_config_dirs}/pulse/{,**} rw,
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## Reading /usr allowed, writing requires ownership
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/usr/** r,
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owner /usr/** rwlk,
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/tmp/namespace-dev-@{rand6}/{,**} rw,
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/tmp/systemd-private-*/{,**} rw,
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## Reading files in temp requires ownership
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owner /{,var/}tmp/** rw,
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@{run}/ r,
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@{run}/credentials/{,**} rw,
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@{run}/dbus/system_bus_socket rw,
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@{run}/spice-vdagentd/spice-vdagent-sock rw,
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@{run}/systemd/{,**} rw,
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@{run}/udev/control rw,
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@{run}/udev/data/* r,
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@{run}/udev/tags/systemd/ r,
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@{run}/user/@{uid}/{,**} rwlk,
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owner @{run}/* rw,
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owner @{run}/*/ rw,
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owner @{run}/*/* rw,
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## Reading /etc allowed, writing requires ownership
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/{,usr/local/}etc/** r,
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owner /{,usr/local/}etc/** rwmlk,
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@{sys}/bus/ r,
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@{sys}/class/ r,
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@{sys}/class/sound/ r,
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@{sys}/devices/@{pci}/** r,
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@{sys}/devices/**/net/** r,
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@{sys}/devices/**/uevent r,
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@{sys}/devices/virtual/dmi/id/{sys,board,bios}_vendor r,
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@{sys}/devices/virtual/dmi/id/product_name r,
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@{sys}/devices/virtual/dmi/id/product_version r,
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@{sys}/devices/virtual/tty/console/active r,
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@{sys}/fs/**/ r,
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@{sys}/fs/cgroup/{,**} rw,
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@{sys}/kernel/**/ r,
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@{sys}/module/apparmor/parameters/enabled r,
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## Can be restricted? Maybe
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/dev/** rw,
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@{PROC}/@{pid}/{uid_map,gid_map} r,
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@{PROC}/@{pid}/attr/apparmor/exec w,
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@{PROC}/@{pid}/cgroup r,
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@{PROC}/@{pid}/cmdline r,
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@{PROC}/@{pid}/comm r,
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@{PROC}/@{pid}/coredump_filter r,
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@{PROC}/@{pid}/environ r,
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@{PROC}/@{pid}/fd/ r,
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@{PROC}/@{pid}/gid_map w,
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@{PROC}/@{pid}/loginuid rw,
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@{PROC}/@{pid}/mountinfo r,
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@{PROC}/@{pid}/setgroups rw,
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@{PROC}/@{pid}/stat r,
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@{PROC}/@{pid}/task/@{tid}/comm rw,
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@{PROC}/@{pid}/uid_map w,
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@{PROC}/cmdline r,
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@{PROC}/devices r,
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@{PROC}/pressure/* r,
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@{PROC}/swaps r,
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@{PROC}/sys/fs/binfmt_misc/ r,
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@{PROC}/sys/fs/nr_open r,
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@{PROC}/sys/kernel/* r,
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@{PROC}/sys/kernel/random/* rw,
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@{PROC}/sys/net/ipv{4,6}/** rw,
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owner @{PROC}/@{pid}/oom_score_adj rw,
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## Owner can access his media and mount
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owner @{MOUNTDIR}/** rw,
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/dev/ r,
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/dev/bus/usb/ r,
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/dev/hwrng r,
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/dev/rfkill rw,
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/dev/shm/ rw,
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/dev/tty rw,
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/dev/tty@{int} rwk,
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owner /dev/console rwk,
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owner /dev/hugepages/ rw,
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owner /dev/mqueue/ rw,
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owner /dev/ttyS@{int} rwk,
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## Many stuff run in /var. We deny executing tmp and log files.
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/var/** rwmlkPix,
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deny /var/log/** x,
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deny /var/tmp/** x,
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## Can be restricted
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@{run}/** rw,
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owner @{run}/** rwlk,
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## Reading can be more restricted for subdirs
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@{PROC}/** r,
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owner @{PROC}/** rw,
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## Can definetely be restricted further
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@{sys}/** rw,
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## Explicitly deny access to memory, I/O ports and the disk in other ways to circumvent the policy
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deny /dev/mem rw,
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deny /dev/kmem rw,
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deny /dev/port rw,
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deny /dev/sd* rw,
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deny /dev/vd* rw,
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deny /dev/nvme* rw,
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deny /dev/disk/** rw,
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deny /dev/block/** rw,
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include if exists <usr/full-policy.d>
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include if exists <local/full-policy>
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include if exists <usr/systemd.d>
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include if exists <local/systemd>
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}
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@ -1,6 +1,9 @@
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# Common profile flags definition for all distributions
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# One profile by line using the format: '<profile> <flags>'
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systemd attach_disconnected,complain
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systemd-user attach_disconnected,complain
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aa-load complain
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acpid attach_disconnected,complain
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agetty complain
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