selinux-policy/refpolicy/policy/modules/system/init.te

# Copyright (C) 2005 Tresys Technology, LLC

policy_module(init,1.0)

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

#
# init_t is the domain of the init process.
#
type init_t;
domain_make_domain(init_t)
role system_r types init_t;

#
# init_exec_t is the type of the init program.
#
type init_exec_t;
kernel_make_userland_entrypoint(init_t,init_exec_t)
domain_make_entrypoint_file(init_t,init_exec_t)

#
# initctl_t is the type of the named pipe created 
# by init during initialization.  This pipe is used
# to communicate with init.
#
type initctl_t;
files_make_file(initctl_t)
filesystem_tmpfs_associate(initctl_t)
devices_create_dev_entry(init_t,initctl_t,fifo_file)

#
# init_var_run_t is the type for /var/run/shutdown.pid.
#
type init_var_run_t;
files_make_daemon_runtime_file(init_var_run_t)

type initrc_t;
domain_make_domain(initrc_t)
role system_r types initrc_t;

type initrc_exec_t;
domain_make_entrypoint_file(initrc_t,initrc_exec_t)

type initrc_devpts_t;
filesystem_associate(initrc_devpts_t)
filesystem_noxattr_associate(initrc_devpts_t)
terminal_make_pseudoterminal(initrc_devpts_t)

type initrc_var_run_t;
files_make_daemon_runtime_file(initrc_var_run_t)

type initrc_state_t;
files_make_file(initrc_state_t)

type initrc_tmp_t;
files_make_temporary_file(initrc_tmp_t)

########################################
#
# Init local policy
#

# Re-exec itself
allow init_t init_exec_t:file { getattr read execute execute_no_trans };

# For /var/run/shutdown.pid.
allow init_t init_var_run_t:file { create getattr read append write setattr unlink };
files_create_daemon_runtime_data(init_t,init_var_run_t)

# Run init scripts.  this is ok since initrc
# is also in this module
allow init_t initrc_t:process transition;
allow init_t initrc_exec_t:file { getattr read execute };
type_transition init_t initrc_exec_t:process initrc_t;
dontaudit init_t initrc_t:process { noatsecure siginh rlimitinh };

allow init_t self:fifo_file { read write ioctl };

kernel_sigchld_from(init_t)

# If you load a new policy that removes active domains, processes can
# get stuck if you do not allow unlabeled processes to signal init
# If you load an incompatible policy, you should probably reboot,
# since you may have compromised system security.
kernel_unlabeled_sigchld_from(init_t)

kernel_set_selinux_boolean(init_t)
kernel_read_system_state(init_t)
kernel_read_hardware_state(init_t)
kernel_share_state(init_t)

terminal_use_all_terminals(init_t)

corecommands_chroot(init_t)
corecommands_execute_general_programs(init_t)
corecommands_execute_system_programs(init_t)

domain_signal_all_domains(init_t)
domain_kill_all_domains(init_t)

files_modify_system_runtime_data(init_t)
# file descriptors inherited from the rootfs:
files_ignore_modify_rootfs_file(init_t)
files_ignore_modify_rootfs_device(init_t)

libraries_use_dynamic_loader(init_t)
libraries_use_shared_libraries(init_t)

logging_send_system_log_message(init_t)

selinux_read_config(init_t)

miscfiles_read_localization(init_t)

tunable_policy(`distro_redhat',`
filesystem_use_tmpfs_character_devices(init_t)
')

########################################
#
# the following seem questionable
#

libraries_modify_dynamic_loader_cache(init_t)
files_create_runtime_system_config(init_t)
authlogin_modify_login_records(init_t)
logging_modify_system_logs(init_t)

# Use capabilities. old rule:
allow init_t self:capability ~sys_module;
# is ~sys_module really needed? observed: 
# sys_boot
# sys_tty_config
# kill: now provided by domain_kill_all_domains()
# setuid (from /sbin/shutdown)
# sys_chroot (from /usr/bin/chroot): now provided by corecommands_chroot()

# Modify utmp.
allow init_t initrc_var_run_t:file { getattr read write setattr };

ifdef(`TODO',`

# for mount points
allow init_t file_t:dir search;
') dnl end TODO

########################################
#
# Init script local policy
#

allow initrc_t self:process { getpgid setsched setpgid setrlimit getsched };
allow initrc_t self:capability ~{ sys_admin sys_module };
allow initrc_t self:passwd rootok;

# Allow IPC with self
allow initrc_t self:unix_dgram_socket { create ioctl read getattr write setattr append bind connect getopt setopt shutdown };
allow initrc_t self:unix_stream_socket { create listen accept ioctl read getattr write setattr append bind connect getopt setopt shutdown connectto };
allow initrc_t self:fifo_file { read write ioctl };

allow initrc_t self:netlink_route_socket { create ioctl read getattr write setattr append bind connect getopt setopt shutdown nlmsg_read };

allow initrc_t initrc_state_t:dir { create read getattr lock setattr ioctl unlink rename search add_name remove_name reparent write rmdir };
allow initrc_t initrc_state_t:file { create ioctl read getattr lock write setattr append link unlink rename };
allow initrc_t initrc_state_t:lnk_file { create read getattr setattr unlink rename };

allow initrc_t self:tcp_socket { connect listen accept create ioctl read getattr write setattr append bind getopt setopt shutdown };
allow initrc_t self:udp_socket { connect create ioctl read getattr write setattr append bind getopt setopt shutdown };

files_create_daemon_runtime_data(initrc_t,initrc_var_run_t)

allow initrc_t initrc_tmp_t : file { create ioctl read getattr lock write setattr append link unlink rename };
allow initrc_t initrc_tmp_t : dir { create read getattr lock setattr ioctl link unlink rename search add_name remove_name reparent write rmdir };
files_create_private_tmp_data(initrc_t,initrc_tmp_t, { file dir })

kernel_read_system_state(initrc_t)
kernel_read_software_raid_state(initrc_t)
kernel_read_network_state(initrc_t)
kernel_read_ring_buffer(initrc_t)
kernel_change_ring_buffer_level(initrc_t)
kernel_clear_ring_buffer(initrc_t)
kernel_get_sysvipc_info(initrc_t)
kernel_read_hardware_state(initrc_t)
kernel_modify_hardware_config_option(initrc_t)
kernel_read_all_sysctl(initrc_t)
kernel_modify_all_sysctl(initrc_t)
kernel_get_selinux_enforcement_mode(initrc_t)
kernel_list_usb_hardware(initrc_t)
# for lsof which is used by alsa shutdown:
kernel_ignore_get_message_interface_attributes(initrc_t)

bootloader_read_kernel_symbol_table(initrc_t)

corenetwork_network_tcp_on_all_interfaces(initrc_t)
corenetwork_network_raw_on_all_interfaces(initrc_t)
corenetwork_network_udp_on_all_interfaces(initrc_t)
corenetwork_network_tcp_on_all_nodes(initrc_t)
corenetwork_network_raw_on_all_nodes(initrc_t)
corenetwork_network_udp_on_all_nodes(initrc_t)
corenetwork_network_tcp_on_all_ports(initrc_t)
corenetwork_network_udp_on_all_ports(initrc_t)
corenetwork_bind_tcp_on_all_nodes(initrc_t)
corenetwork_bind_udp_on_all_nodes(initrc_t)

devices_get_random_data(initrc_t)
devices_get_pseudorandom_data(initrc_t)
devices_add_entropy(initrc_t)
devices_set_pseudorandom_seed(initrc_t)
devices_read_framebuffer(initrc_t)
devices_read_realtime_clock(initrc_t)
devices_read_sound_mixer_levels(initrc_t)
devices_write_sound_mixer_levels(initrc_t)
devices_set_all_character_device_attributes(initrc_t)
# Wants to remove udev.tbl:
devices_remove_dev_symbolic_links(initrc_t)

filesystem_register_binary_executable_type(initrc_t)
# cjp: not sure why these are here; should use mount policy
filesystem_mount_all_filesystems(initrc_t)
filesystem_unmount_all_filesystems(initrc_t)
filesystem_remount_all_filesystems(initrc_t)
filesystem_get_all_filesystems_attributes(initrc_t)

storage_get_fixed_disk_attributes(initrc_t)
storage_set_fixed_disk_attributes(initrc_t)
storage_set_removable_device_attributes(initrc_t)

terminal_use_all_terminals(initrc_t)
terminal_reset_physical_terminal_labels(initrc_t)

corecommands_execute_general_programs(initrc_t)
corecommands_execute_system_programs(initrc_t)
corecommands_execute_shell(initrc_t)

domain_kill_all_domains(initrc_t)
domain_read_all_domains_process_state(initrc_t)
domain_use_widely_inheritable_file_descriptors(initrc_t)

files_get_all_file_attributes(initrc_t)
files_remove_all_tmp_data(initrc_t)
files_remove_all_lock_files(initrc_t)
files_remove_all_daemon_runtime_data(initrc_t)
files_read_general_system_config(initrc_t)
files_create_runtime_system_config(initrc_t)
files_manage_system_lock_files(initrc_t)
files_execute_system_config_script(initrc_t)
files_read_general_application_resources(initrc_t)
files_manage_pseudorandom_saved_seed(initrc_t)

libraries_modify_dynamic_loader_cache(initrc_t)
libraries_use_dynamic_loader(initrc_t)
libraries_use_shared_libraries(initrc_t)
libraries_execute_library_scripts(initrc_t)

logging_send_system_log_message(initrc_t)

selinux_read_config(initrc_t)

sysnetwork_read_network_config(initrc_t)

modutils_read_kernel_module_loading_config(initrc_t)

authlogin_modify_login_records(initrc_t)
authlogin_modify_last_login_log(initrc_t)

miscfiles_read_localization(initrc_t)

logging_modify_system_logs(initrc_t)
logging_read_all_logs(initrc_t)
logging_append_all_logs(initrc_t)

udev_modify_database(initrc_t)

userdomain_read_all_users_data(initrc_t)
# Allow access to the sysadm TTYs. Note that this will give access to the 
# TTYs to any process in the initrc_t domain. Therefore, daemons and such
# started from init should be placed in their own domain.
userdomain_use_admin_terminals(initrc_t)

tunable_policy(`distro_debian', `
filesystem_tmpfs_associate(initrc_var_run_t)
')

tunable_policy(`distro_redhat',`
kernel_set_selinux_enforcement_mode(initrc_t)

# Create and read /boot/kernel.h and /boot/System.map.
# Redhat systems typically create this file at boot time.
bootloader_create_runtime_data(initrc_t)
bootloader_modify_bootloader_data_directory_symbolic_links(initrc_t)

filesystem_use_tmpfs_character_devices(initrc_t)

files_create_boot_flag(initrc_t)

# readahead asks for these
mta_read_mail_aliases(initrc_t)
') dnl end distro_redhat

optional_policy(`authlogin.te',`
authlogin_pam_read_runtime_data(initrc_t)
authlogin_pam_remove_runtime_data(initrc_t)
')

optional_policy(`hotplug.te',`
kernel_read_usb_hardware_state(initrc_t)
# init scripts run /etc/hotplug/usb.rc
hotplug_read_config(initrc_t)
modutils_read_kernel_module_dependencies(initrc_t)
')

optional_policy(`rpm.te',`
# why is this needed:
rpm_manage_package_database(initrc_t)
# for a bug in rm
files_ignore_write_all_daemon_runtime_data(initrc_t)
# bash tries ioctl for some reason
files_ignore_ioctl_all_daemon_runtime_data(initrc_t)
# bash tries to access a block device in the initrd
kernel_ignore_get_unlabeled_block_device_attributes(initrc_t)
') dnl end rpm.te

ifdef(`TODO',`

# Mount and unmount file systems.
allow initrc_t { file_t default_t }:dir { read search getattr mounton };

allow initrc_t var_spool_t:file rw_file_perms;

# Set device ownerships/modes.
allow initrc_t xconsole_device_t:fifo_file setattr;

# for lsof in shutdown scripts
can_kerberos(initrc_t)
dontaudit initrc_t krb5_conf_t:file write;
allow initrc_t krb5_conf_t:file { getattr read };

#
#  These rules are here to allow init scripts to su
#
optional_policy(`su.te', `
su_restricted_domain(initrc,system)
role system_r types initrc_su_t;
')

tunable_policy(`distro_debian', `
allow initrc_t { etc_t device_t }:dir setattr;

# for storing state under /dev/shm
allow initrc_t tmpfs_t:dir setattr;
file_type_auto_trans(initrc_t, tmpfs_t, initrc_var_run_t, dir)
file_type_auto_trans(initrc_t, tmpfs_t, fixed_disk_device_t, blk_file)
')dnl end distro_debian

tunable_policy(`distro_redhat', `
# readahead asks for these
allow initrc_t var_lib_nfs_t:file { getattr read };
')dnl end distro_redhat

#
# Shutting down xinet causes these
#
# Rsync
dontaudit initrc_t mail_spool_t:lnk_file read;

# for lsof which is used by alsa shutdown
dontaudit initrc_t domain:{ udp_socket tcp_socket fifo_file unix_dgram_socket } getattr;

') dnl end TODO