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|
; -*- lisp -*-
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2018, 2022 Ricardo Wurmus <rekado@elephly.net>
;;; Copyright © 2020 Daniel Brooks <db48x@db48x.net>
;;; Copyright © 2020 Marius Bakke <marius@gnu.org>
;;;
;;; This file is part of GNU Guix.
;;;
;;; GNU Guix is free software; you can redistribute it and/or modify it
;;; under the terms of the GNU General Public License as published by
;;; the Free Software Foundation; either version 3 of the License, or (at
;;; your option) any later version.
;;;
;;; GNU Guix is distributed in the hope that it will be useful, but
;;; WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;;; GNU General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
;; This is a specification for SELinux 2.7 written in the SELinux Common
;; Intermediate Language (CIL). It refers to types that must be defined in
;; the system's base policy.
;; If you, like me, need advice about fixing an SELinux policy, I recommend
;; reading https://danwalsh.livejournal.com/55324.html
;; In particular, you can run semanage permissive -a guix_daemon.guix_daemon_t
;; to allow guix-daemon to do whatever it wants. SELinux will still check its
;; permissions, and when it doesn't have permission it will still send an
;; audit message to your system logs. This lets you know what permissions it
;; ought to have. Use ausearch --raw to find the permissions violations, then
;; pipe that to audit2allow to generate an updated policy. You'll still need
;; to translate that policy into CIL in order to update this file, but that's
;; fairly straight-forward. Annoying, but easy.
(block guix_daemon
;; Require existing types
(typeattributeset cil_gen_require domain)
(typeattributeset cil_gen_require init_t)
(typeattributeset cil_gen_require init_var_run_t)
(typeattributeset cil_gen_require nscd_var_run_t)
(typeattributeset cil_gen_require system_dbusd_var_run_t)
(typeattributeset cil_gen_require tmp_t)
(typeattributeset cil_gen_require var_log_t)
;; Declare own types
(type guix_daemon_t)
(roletype object_r guix_daemon_t)
(type guix_daemon_conf_t)
(roletype object_r guix_daemon_conf_t)
(typeattributeset file_type guix_daemon_conf_t)
(type guix_daemon_exec_t)
(roletype object_r guix_daemon_exec_t)
(typeattributeset file_type guix_daemon_exec_t)
(type guix_daemon_socket_t)
(roletype object_r guix_daemon_socket_t)
(typeattributeset file_type guix_daemon_socket_t)
(type guix_store_content_t)
(roletype object_r guix_store_content_t)
(typeattributeset file_type guix_store_content_t)
(type guix_profiles_t)
(roletype object_r guix_profiles_t)
(typeattributeset file_type guix_profiles_t)
;; These types are domains, thereby allowing process rules
(typeattributeset domain (guix_daemon_t guix_daemon_exec_t))
(level low (s0))
;; When a process in init_t or guix_store_content_t spawns a
;; guix_daemon_exec_t process, let it run in the guix_daemon_t context
(typetransition init_t guix_daemon_exec_t
process guix_daemon_t)
(typetransition guix_store_content_t guix_daemon_exec_t
process guix_daemon_t)
(roletype system_r guix_daemon_t)
;; allow init_t to read and execute guix files
(allow init_t
guix_profiles_t
(lnk_file (read)))
(allow init_t
guix_daemon_exec_t
(file (execute)))
(allow init_t
guix_daemon_t
(process (transition)))
(allow init_t
guix_store_content_t
(lnk_file (read)))
(allow init_t
guix_store_content_t
(file (open read execute)))
(allow init_t
guix_profiles_t
(dir (setattr)))
;; guix-daemon needs to know the names of users
(allow guix_daemon_t
passwd_file_t
(file (getattr open read)))
;; Permit communication with NSCD
(allow guix_daemon_t
nscd_var_run_t
(file (map read)))
(allow guix_daemon_t
nscd_var_run_t
(dir (search)))
(allow guix_daemon_t
nscd_var_run_t
(sock_file (write)))
(allow guix_daemon_t
nscd_t
(fd (use)))
(allow guix_daemon_t
nscd_t
(unix_stream_socket (connectto)))
(allow guix_daemon_t nscd_t
(nscd (getgrp gethost getpwd getserv shmemgrp shmemhost shmempwd shmemserv)))
;; permit downloading packages via HTTP(s)
(allow guix_daemon_t http_port_t
(tcp_socket (name_connect)))
(allow guix_daemon_t ftp_port_t
(tcp_socket (name_connect)))
(allow guix_daemon_t ephemeral_port_t
(tcp_socket (name_connect)))
;; Permit logging and temp file access
(allow guix_daemon_t
tmp_t
(lnk_file (create rename setattr unlink)))
(allow guix_daemon_t
tmp_t
(file (link
rename create execute execute_no_trans write
unlink setattr map relabelto relabelfrom)))
(allow guix_daemon_t
tmp_t
(fifo_file (open read write create getattr ioctl setattr unlink)))
(allow guix_daemon_t
tmp_t
(dir (create rename
rmdir relabelto relabelfrom reparent
add_name remove_name
open read write
getattr setattr
search)))
(allow guix_daemon_t
tmp_t
(sock_file (create getattr setattr unlink write)))
(allow guix_daemon_t
var_log_t
(file (create getattr open write)))
(allow guix_daemon_t
var_log_t
(dir (getattr create write add_name)))
(allow guix_daemon_t
var_run_t
(lnk_file (read)))
(allow guix_daemon_t
var_run_t
(dir (search)))
;; Spawning processes, execute helpers
(allow guix_daemon_t
self
(process (fork execmem setrlimit setpgid setsched)))
(allow guix_daemon_t
guix_daemon_exec_t
(file (execute
execute_no_trans read write open entrypoint map
getattr link unlink)))
;; Remounting /gnu/store read-write.
(allow guix_daemon_t
fs_t
(filesystem (remount)))
;; TODO: unknown
(allow guix_daemon_t
root_t
(dir (mounton)))
(allow guix_daemon_t
fs_t
(filesystem (getattr)))
(allow guix_daemon_conf_t
fs_t
(filesystem (associate)))
;; Build isolation
(allow guix_daemon_t
guix_store_content_t
(file (ioctl mounton)))
(allow guix_store_content_t
fs_t
(filesystem (associate)))
(allow guix_daemon_t
guix_store_content_t
(dir (read mounton)))
(allow guix_daemon_t
guix_daemon_t
(capability (net_admin
fsetid fowner
chown setuid setgid
dac_override dac_read_search
sys_chroot
sys_admin)))
(allow guix_daemon_t
fs_t
(filesystem (unmount)))
(allow guix_daemon_t
devpts_t
(dir (search)))
(allow guix_daemon_t
devpts_t
(filesystem (mount)))
(allow guix_daemon_t
devpts_t
(chr_file (ioctl open read write setattr getattr)))
(allow guix_daemon_t
tmpfs_t
(filesystem (getattr mount)))
(allow guix_daemon_t
tmpfs_t
(file (create open read unlink write)))
(allow guix_daemon_t ;same as above, but with tmp_t
tmp_t
(file (create open read unlink write)))
(allow guix_daemon_t
tmpfs_t
(dir (getattr add_name remove_name write)))
(allow guix_daemon_t
proc_t
(file (getattr open read)))
(allow guix_daemon_t
proc_t
(dir (read)))
(allow guix_daemon_t
proc_t
(filesystem (associate mount)))
(allow guix_daemon_t
null_device_t
(chr_file (getattr open read write)))
(allow guix_daemon_t
kvm_device_t
(chr_file (getattr)))
(allow guix_daemon_t
zero_device_t
(chr_file (getattr)))
(allow guix_daemon_t
urandom_device_t
(chr_file (getattr)))
(allow guix_daemon_t
random_device_t
(chr_file (getattr)))
(allow guix_daemon_t
devtty_t
(chr_file (getattr)))
;; Access to store items
(allow guix_daemon_t
guix_store_content_t
(dir (reparent
create
getattr setattr
search rename
add_name remove_name
open write
rmdir relabelfrom)))
(allow guix_daemon_t
guix_store_content_t
(file (create
lock
setattr getattr
execute execute_no_trans
link unlink
map
rename
append
open read write relabelfrom)))
(allow guix_daemon_t
guix_store_content_t
(lnk_file (create
getattr setattr
link unlink
read
rename)))
(allow guix_daemon_t
guix_store_content_t
(fifo_file (create getattr open read unlink write)))
(allow guix_daemon_t
guix_store_content_t
(sock_file (create getattr setattr unlink write)))
;; Access to run state directories
(allow guix_daemon_t
system_dbusd_var_run_t
(dir (search)))
(allow guix_daemon_t
init_var_run_t
(dir (search)))
;; Access to configuration files and directories
(allow guix_daemon_t
guix_daemon_conf_t
(dir (search create
setattr getattr
add_name remove_name
open read write)))
(allow guix_daemon_t
guix_daemon_conf_t
(file (create rename
lock
map
getattr setattr
unlink
open read write)))
(allow guix_daemon_t
guix_daemon_conf_t
(lnk_file (create getattr rename unlink read)))
(allow guix_daemon_t net_conf_t
(file (getattr open read)))
(allow guix_daemon_t net_conf_t
(lnk_file (read)))
(allow guix_daemon_t NetworkManager_var_run_t
(dir (search)))
;; Access to profiles
(allow guix_daemon_t
guix_profiles_t
(dir (search getattr setattr read write open create add_name)))
(allow guix_daemon_t
guix_profiles_t
(lnk_file (read getattr)))
;; Access to profile links in the home directory
;; TODO: allow access to profile links *anywhere* on the filesystem
(allow guix_daemon_t
user_home_t
(lnk_file (read getattr)))
(allow guix_daemon_t
user_home_t
(dir (search)))
(allow guix_daemon_t
cache_home_t
(dir (search)))
(allow guix_daemon_t
cache_home_t
(lnk_file (getattr read)))
;; self upgrades
(allow guix_daemon_t
self
(dir (add_name write)))
(allow guix_daemon_t
self
(netlink_route_socket (bind create getattr nlmsg_read read write getopt)))
;; Socket operations
(allow guix_daemon_t
guix_daemon_socket_t
(sock_file (unlink write)))
(allow guix_daemon_t
init_t
(fd (use)))
(allow guix_daemon_t
init_t
(unix_stream_socket (write)))
(allow guix_daemon_t
guix_daemon_conf_t
(unix_stream_socket (listen)))
(allow guix_daemon_t
guix_daemon_conf_t
(sock_file (create unlink write)))
(allow guix_daemon_t
self
(unix_stream_socket (create
read write
connect bind accept
getopt setopt)))
(allow guix_daemon_t
self
(tcp_socket (accept listen bind connect create setopt getopt getattr ioctl read write shutdown)))
(allow guix_daemon_t
unreserved_port_t
(tcp_socket (name_bind name_connect accept listen)))
(allow guix_daemon_t
self
(udp_socket (connect getattr bind getopt setopt read write)))
(allow guix_daemon_t
self
(fifo_file (write read)))
(allow guix_daemon_t
self
(udp_socket (ioctl create)))
(allow guix_daemon_t
self
(unix_stream_socket (connectto)))
(allow guix_daemon_t
self
(unix_dgram_socket (create bind connect sendto read write)))
;; For some esoteric build jobs (i.e. running PostgreSQL, etc).
(allow guix_daemon_t
self
(capability (kill)))
(allow guix_daemon_t
node_t
(tcp_socket (node_bind)))
(allow guix_daemon_t
node_t
(udp_socket (node_bind)))
(allow guix_daemon_t
port_t
(tcp_socket (name_connect)))
(allow guix_daemon_t
tmpfs_t
(file (map read write link getattr)))
(allow guix_daemon_t
usermodehelper_t
(file (read)))
(allow guix_daemon_t
hugetlbfs_t
(file (map read write)))
(allow guix_daemon_t
proc_net_t
(file (read)))
(allow guix_daemon_t
postgresql_port_t
(tcp_socket (name_connect name_bind)))
(allow guix_daemon_t
rtp_media_port_t
(udp_socket (name_bind)))
(allow guix_daemon_t
vnc_port_t
(tcp_socket (name_bind)))
;; I guess sometimes it needs random numbers
(allow guix_daemon_t
random_device_t
(chr_file (read)))
;; guix system vm
(allow guix_daemon_t
kvm_device_t
(chr_file (ioctl open read write)))
(allow guix_daemon_t
kernel_t
(system (ipc_info)))
;; Label file system
(filecon "@guix_sysconfdir@/guix(/.*)?"
any (system_u object_r guix_daemon_conf_t (low low)))
(filecon "@guix_localstatedir@/guix(/.*)?"
any (system_u object_r guix_daemon_conf_t (low low)))
(filecon "@guix_localstatedir@/guix/profiles(/.*)?"
any (system_u object_r guix_profiles_t (low low)))
(filecon "/gnu"
dir (unconfined_u object_r guix_store_content_t (low low)))
(filecon "@storedir@(/.+)?"
any (unconfined_u object_r guix_store_content_t (low low)))
(filecon "@storedir@/[^/]+/.+"
any (unconfined_u object_r guix_store_content_t (low low)))
(filecon "@prefix@/bin/guix-daemon"
file (system_u object_r guix_daemon_exec_t (low low)))
(filecon "@guix_localstatedir@/guix/profiles/per-user/[^/]+/current-guix/bin/guix-daemon"
file (system_u object_r guix_daemon_exec_t (low low)))
(filecon "@storedir@/.+-(guix-.+|profile)/bin/guix-daemon"
file (system_u object_r guix_daemon_exec_t (low low)))
(filecon "@storedir@/[a-z0-9]+-guix-daemon"
file (system_u object_r guix_daemon_exec_t (low low)))
(filecon "@guix_localstatedir@/guix/daemon-socket/socket"
any (system_u object_r guix_daemon_socket_t (low low))))
|
