path: root/policy/modules/services/dbus.te

policy_module(dbus)

gen_require(`
	class dbus all_dbus_perms;
')

########################################
#
# Declarations
#

## <desc>
## <p>
## Determine whether the dbus server
## can use the network (insecure
## except than in the case of the
## loopback interface).
## </p>
## </desc>
gen_tunable(dbus_can_network, false)

## <desc>
## <p>
## Allow dbus-daemon system bus to access /dev/net/tun
## which is needed to pass tun/tap device file descriptors
## over D-Bus.  This is needed by openvpn3-linux.
## </p>
## </desc>
gen_tunable(dbus_pass_tuntap_fd, false)

## <desc>
## <p>
## Allow dbus-daemon system bus to to run systemd transient
## units. This is used by dbus-broker for dbus-activated
## services when the unit file for the service does not exist.
## </p>
## </desc>
gen_tunable(dbus_broker_run_transient_units, false)

## <desc>
## <p>
## Enable additional rules to support using dbus-broker
## as the dbus-daemon system bus.
## </p>
## </desc>
gen_tunable(dbus_broker_system_bus, false)

attribute dbusd_unconfined;
attribute session_bus_type;

attribute dbusd_system_bus_client;
attribute dbusd_session_bus_client;

type dbusd_etc_t;
files_config_file(dbusd_etc_t)

type dbusd_exec_t;
corecmd_executable_file(dbusd_exec_t)

type dbusd_unit_t;
init_unit_file(dbusd_unit_t)

type session_dbusd_home_t;
userdom_user_home_content(session_dbusd_home_t)

type session_dbusd_runtime_t;
files_runtime_file(session_dbusd_runtime_t)
userdom_user_runtime_content(session_dbusd_runtime_t)

type session_dbusd_tmp_t;
userdom_user_tmp_file(session_dbusd_tmp_t)

type system_dbusd_t;
init_system_domain(system_dbusd_t, dbusd_exec_t)
init_named_socket_activation(system_dbusd_t, system_dbusd_runtime_t)

type system_dbusd_runtime_t alias system_dbusd_var_run_t;
files_runtime_file(system_dbusd_runtime_t)
init_daemon_runtime_file(system_dbusd_runtime_t, dir, "dbus")
init_mountpoint(system_dbusd_runtime_t)

type system_dbusd_tmp_t;
files_tmp_file(system_dbusd_tmp_t)

type system_dbusd_tmpfs_t;
files_tmpfs_file(system_dbusd_tmpfs_t)

type system_dbusd_var_lib_t;
files_type(system_dbusd_var_lib_t)

ifdef(`enable_mls',`
	init_ranged_system_domain(system_dbusd_t, dbusd_exec_t, s0 - mls_systemhigh)
')

########################################
#
# Local policy
#

allow system_dbusd_t self:capability { dac_override setgid setpcap setuid sys_resource };
# net_admin for changing buffer sizes
dontaudit system_dbusd_t self:capability { net_admin sys_tty_config };
allow system_dbusd_t self:process { getattr getcap getsched setcap setpgid setrlimit signal_perms };
allow system_dbusd_t self:fifo_file rw_fifo_file_perms;
allow system_dbusd_t self:dbus { acquire_svc send_msg };
allow system_dbusd_t self:unix_stream_socket { connectto create_stream_socket_perms };
allow system_dbusd_t self:netlink_selinux_socket { bind create read };

allow system_dbusd_t dbusd_etc_t:dir { list_dir_perms watch };
read_files_pattern(system_dbusd_t, dbusd_etc_t, dbusd_etc_t)
read_lnk_files_pattern(system_dbusd_t, dbusd_etc_t, dbusd_etc_t)

manage_dirs_pattern(system_dbusd_t, system_dbusd_tmp_t, system_dbusd_tmp_t)
manage_files_pattern(system_dbusd_t, system_dbusd_tmp_t, system_dbusd_tmp_t)
files_tmp_filetrans(system_dbusd_t, system_dbusd_tmp_t, { dir file sock_file })

manage_files_pattern(system_dbusd_t, system_dbusd_tmpfs_t, system_dbusd_tmpfs_t)
fs_tmpfs_filetrans(system_dbusd_t, system_dbusd_tmpfs_t, file)
allow system_dbusd_t system_dbusd_tmpfs_t:file map;

read_files_pattern(system_dbusd_t, system_dbusd_var_lib_t, system_dbusd_var_lib_t)

manage_dirs_pattern(system_dbusd_t, system_dbusd_runtime_t, system_dbusd_runtime_t)
manage_files_pattern(system_dbusd_t, system_dbusd_runtime_t, system_dbusd_runtime_t)
manage_sock_files_pattern(system_dbusd_t, system_dbusd_runtime_t, system_dbusd_runtime_t)
files_runtime_filetrans(system_dbusd_t, system_dbusd_runtime_t, { dir file sock_file })

can_exec(system_dbusd_t, dbusd_exec_t)

kernel_read_system_state(system_dbusd_t)
kernel_read_kernel_sysctls(system_dbusd_t)

corecmd_list_bin(system_dbusd_t)
corecmd_read_bin_pipes(system_dbusd_t)
corecmd_read_bin_sockets(system_dbusd_t)
corecmd_exec_shell(system_dbusd_t)

dev_read_urand(system_dbusd_t)
dev_read_sysfs(system_dbusd_t)

domain_use_interactive_fds(system_dbusd_t)
domain_read_all_domains_state(system_dbusd_t)

files_list_home(system_dbusd_t)
files_read_usr_files(system_dbusd_t)
files_watch_usr_dirs(system_dbusd_t)

fs_getattr_all_fs(system_dbusd_t)
fs_list_inotifyfs(system_dbusd_t)
fs_search_auto_mountpoints(system_dbusd_t)
fs_search_cgroup_dirs(system_dbusd_t)
fs_dontaudit_list_nfs(system_dbusd_t)

mls_fd_use_all_levels(system_dbusd_t)
mls_rangetrans_target(system_dbusd_t)
mls_file_read_all_levels(system_dbusd_t)
mls_socket_write_all_levels(system_dbusd_t)
mls_socket_read_to_clearance(system_dbusd_t)
mls_dbus_recv_all_levels(system_dbusd_t)

selinux_get_fs_mount(system_dbusd_t)
selinux_use_status_page(system_dbusd_t)
selinux_validate_context(system_dbusd_t)
selinux_compute_access_vector(system_dbusd_t)
selinux_compute_create_context(system_dbusd_t)
selinux_compute_relabel_context(system_dbusd_t)
selinux_compute_user_contexts(system_dbusd_t)

term_dontaudit_use_console(system_dbusd_t)

auth_use_nsswitch(system_dbusd_t)
auth_read_pam_console_data(system_dbusd_t)

init_use_fds(system_dbusd_t)
init_use_script_ptys(system_dbusd_t)
init_all_labeled_script_domtrans(system_dbusd_t)

# for powerdevil /usr/lib/x86_64-linux-gnu/libexec/kauth/*
libs_exec_lib_files(system_dbusd_t)

logging_send_audit_msgs(system_dbusd_t)
logging_send_syslog_msg(system_dbusd_t)

miscfiles_read_localization(system_dbusd_t)
miscfiles_read_generic_certs(system_dbusd_t)

seutil_read_config(system_dbusd_t)
seutil_read_default_contexts(system_dbusd_t)

# for machinectl shell
term_use_ptmx(system_dbusd_t)

userdom_dontaudit_use_unpriv_user_fds(system_dbusd_t)
userdom_dontaudit_search_user_home_dirs(system_dbusd_t)
# read a file in ~/.local/share
userdom_read_user_home_content_files(system_dbusd_t)

ifdef(`distro_gentoo',`
	optional_policy(`
		cpufreqselector_dbus_chat(system_dbusd_t)
	')
')

ifdef(`init_systemd', `
	# gdm3 causes system_dbusd_t to want this access
	dev_rw_dri(system_dbusd_t)
	dev_rw_input_dev(system_dbusd_t)

	files_read_etc_runtime_files(system_dbusd_t)

	# for /run/systemd/dynamic-uid/
	init_list_runtime(system_dbusd_t)
	init_read_runtime_symlinks(system_dbusd_t)

	init_start_system(system_dbusd_t) # needed by dbus-broker

	# dbus-broker checks the status of systemd-logind
	init_get_generic_units_status(system_dbusd_t)

	# for system dbus daemon to start/stop units
	init_start_all_units(system_dbusd_t)
	init_stop_all_units(system_dbusd_t)

	# Recent versions of dbus are started as Type=notify
	systemd_write_notify_socket(system_dbusd_t)

	tunable_policy(`dbus_broker_system_bus',`
		init_get_system_status(system_dbusd_t)
	')
')

tunable_policy(`dbus_pass_tuntap_fd',`
        corenet_rw_tun_tap_dev(system_dbusd_t)
')

tunable_policy(`dbus_broker_run_transient_units',`
	init_start_transient_units(system_dbusd_t)
	init_stop_transient_units(system_dbusd_t)
')

# the below duplicated tunable blocks are due to
# optionals within tunables not being supported
optional_policy(`
	tunable_policy(`dbus_broker_system_bus',`
		policykit_get_unit_status(system_dbusd_t)
		policykit_start_unit(system_dbusd_t)
		policykit_stop_unit(system_dbusd_t)
		policykit_reload_unit(system_dbusd_t)
	')
')

optional_policy(`
	tunable_policy(`dbus_broker_system_bus',`
		networkmanager_startstop(system_dbusd_t)
		networkmanager_status(system_dbusd_t)
	')
')

optional_policy(`
	# for /run/systemd/users/*
	systemd_read_logind_runtime_files(system_dbusd_t)
	systemd_write_inherited_logind_inhibit_pipes(system_dbusd_t)
	systemd_write_inherited_logind_sessions_pipes(system_dbusd_t)

	systemd_connect_machined(system_dbusd_t)
	# for passing around terminal file handles for machinectl shell
	systemd_use_inherited_machined_ptys(system_dbusd_t)

	# allow populating of /var/lib/dbus by systemd-tmpfilesd
	systemd_tmpfilesd_managed(system_dbusd_var_lib_t)
')

optional_policy(`
	bluetooth_use(system_dbusd_t)
')

optional_policy(`
	policykit_read_lib(system_dbusd_t)
')

optional_policy(`
	seutil_sigchld_newrole(system_dbusd_t)
')

optional_policy(`
	tpm2_rw_abrmd_pipes(system_dbusd_t)
')

optional_policy(`
	unconfined_dbus_send(system_dbusd_t)
')

optional_policy(`
	xserver_read_xdm_lib_files(system_dbusd_t)
	xserver_use_xdm_fds(system_dbusd_t)
')

########################################
#
# Common session bus local policy
#

dontaudit session_bus_type self:capability sys_resource;
allow session_bus_type self:process { getattr sigkill signal };
dontaudit session_bus_type self:process { ptrace setrlimit };
allow session_bus_type self:file rw_inherited_file_perms;
allow session_bus_type self:fifo_file rw_fifo_file_perms;
allow session_bus_type self:dbus { acquire_svc send_msg };
allow session_bus_type self:unix_stream_socket { accept listen };
allow session_bus_type self:netlink_selinux_socket create_socket_perms;

allow session_bus_type dbusd_etc_t:dir list_dir_perms;
read_files_pattern(session_bus_type, dbusd_etc_t, dbusd_etc_t)
read_lnk_files_pattern(session_bus_type, dbusd_etc_t, dbusd_etc_t)
allow session_bus_type dbusd_etc_t:dir watch;

manage_dirs_pattern(session_bus_type, session_dbusd_home_t, session_dbusd_home_t)
manage_files_pattern(session_bus_type, session_dbusd_home_t, session_dbusd_home_t)
userdom_user_home_dir_filetrans(session_bus_type, session_dbusd_home_t, dir, ".dbus")

manage_dirs_pattern(session_bus_type, session_dbusd_tmp_t, session_dbusd_tmp_t)
manage_files_pattern(session_bus_type, session_dbusd_tmp_t, session_dbusd_tmp_t)
manage_sock_files_pattern(session_bus_type, session_dbusd_tmp_t, session_dbusd_tmp_t)
files_tmp_filetrans(session_bus_type, session_dbusd_tmp_t, { dir file sock_file })

manage_dirs_pattern(session_bus_type, session_dbusd_runtime_t, session_dbusd_runtime_t)
manage_files_pattern(session_bus_type, session_dbusd_runtime_t, session_dbusd_runtime_t)
manage_sock_files_pattern(session_bus_type, session_dbusd_runtime_t, session_dbusd_runtime_t)
userdom_user_runtime_filetrans(session_bus_type, session_dbusd_runtime_t, { dir file sock_file })

kernel_read_system_state(session_bus_type)
kernel_read_kernel_sysctls(session_bus_type)

corecmd_list_bin(session_bus_type)
corecmd_read_bin_files(session_bus_type)
corecmd_read_bin_pipes(session_bus_type)
corecmd_read_bin_sockets(session_bus_type)

dev_read_urand(session_bus_type)

domain_read_all_domains_state(session_bus_type)
domain_use_interactive_fds(session_bus_type)

files_list_home(session_bus_type)
files_read_usr_files(session_bus_type)
files_watch_usr_dirs(session_bus_type)
files_dontaudit_search_var(session_bus_type)

fs_getattr_cgroup(session_bus_type)
fs_getattr_romfs(session_bus_type)
fs_getattr_xattr_fs(session_bus_type)
fs_list_inotifyfs(session_bus_type)
fs_dontaudit_list_nfs(session_bus_type)

kernel_getattr_proc(session_bus_type)

selinux_get_fs_mount(session_bus_type)
selinux_validate_context(session_bus_type)
selinux_compute_access_vector(session_bus_type)
selinux_compute_create_context(session_bus_type)
selinux_compute_relabel_context(session_bus_type)
selinux_compute_user_contexts(session_bus_type)

auth_read_pam_console_data(session_bus_type)

logging_send_audit_msgs(session_bus_type)
logging_send_syslog_msg(session_bus_type)

miscfiles_read_localization(session_bus_type)

seutil_read_config(session_bus_type)
seutil_read_default_contexts(session_bus_type)

term_use_all_terms(session_bus_type)

tunable_policy(`dbus_can_network',`
	allow session_bus_type self:tcp_socket { accept listen };

	corenet_all_recvfrom_netlabel(session_bus_type)
	corenet_tcp_sendrecv_generic_if(session_bus_type)
	corenet_tcp_sendrecv_generic_node(session_bus_type)
	corenet_tcp_bind_generic_node(session_bus_type)

	corenet_sendrecv_all_server_packets(session_bus_type)
	corenet_tcp_bind_reserved_port(session_bus_type)
')

optional_policy(`
	xserver_rw_xsession_log(session_bus_type)
	xserver_use_xdm_fds(session_bus_type)
	xserver_rw_xdm_pipes(session_bus_type)
')

########################################
#
# Unconfined access to this module
#

allow dbusd_unconfined { dbusd_session_bus_client dbusd_system_bus_client }:dbus send_msg;
allow dbusd_unconfined { system_dbusd_t session_bus_type }:dbus all_dbus_perms;