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

# Copyright (C) 2005 Tresys Technology, LLC

policy_module(init,1.0)

#
# 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;
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_file(init_var_run_t)
files_create_daemon_runtime_data(init_t,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_t,initrc_devpts_t)

type initrc_var_run_t;
files_make_file(initrc_var_run_t)
files_create_daemon_runtime_data(initrc_t,initrc_var_run_t)

type initrc_state_t;
files_make_file(initrc_state_t)

type initrc_tmp_t;
files_make_file(initrc_tmp_t)
files_create_private_tmp_data(initrc_t,initrc_tmp_t)

type run_init_t;
domain_make_domain(run_init_t)

type run_init_exec_t;
files_make_file(run_init_exec_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 };

# 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 };

allow init_t self:fifo_file { read write ioctl };

kernel_transition_from(init_t,init_exec_t)
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)

domain_signal_all_domains(init_t)
domain_kill_all_domains(init_t)
domain_all_init_domains_transition(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_read_shared_libraries(init_t)

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

logging_send_system_log_message(init_t)

selinux_read_config(init_t)

miscfiles_read_localization(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 };

optional_policy(`consoletype.te',`
consoletype_execute(init_t,optional)
')

########################################
#
# the following still need to be converted over
#

# something other then static libs
allow init_t lib_t:file { getattr read };

# for mount points
allow init_t file_t:dir search;


########################################
#
# 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 };

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)

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)

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)

domain_kill_all_domains(initrc_t)
domain_read_all_domains_process_state(initrc_t)
domain_all_daemon_domains_transition(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)

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)

bootloader_read_kernel_symbol_table(initrc_t)

domain_use_widely_inheritable_file_descriptors(initrc_t)

libraries_modify_dynamic_loader_cache(initrc_t)
libraries_use_dynamic_loader(initrc_t)
libraries_read_shared_libraries(initrc_t)
libraries_execute_library_scripts(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_shared_resources(initrc_t)
files_manage_pseudorandom_saved_seed(initrc_t)

corecommands_execute_general_programs(initrc_t)
corecommands_execute_system_programs(initrc_t)
corecommands_execute_shell(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)

optional_policy(`consoletype.te',`
consoletype_transition(initrc_t)
')

tunable_policy(`distro_redhat',`
kernel_set_selinux_enforcement_mode(initrc_t)

files_create_boot_flag(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)
')

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;

# 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.
allow initrc_t admin_tty_type:chr_file rw_file_perms;

# Read user home directories.
allow initrc_t { home_root_t home_type }:dir r_dir_perms;
allow initrc_t home_type:file r_file_perms;

allow initrc_t udev_runtime_t:file rw_file_perms;

# for lsof in shutdown scripts
optional_policy(`kerberos.te',`
if (allow_kerberos) {
can_network_client(initrc_t, `kerberos_port_t')
can_resolve(initrc_t)
}
') dnl kerberos.te
dontaudit initrc_t krb5_conf_t:file write;
allow initrc_t krb5_conf_t:file { getattr read };

#
# Wants to remove udev.tbl
#
allow initrc_t device_t:dir rw_dir_perms;
allow initrc_t device_t:lnk_file unlink;

#
#  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)
allow { initrc_var_run_t fixed_disk_device_t } tmpfs_t:filesystem associate;
')dnl end distro_debian

tunable_policy(`distro_redhat', `
# Create and read /boot/kernel.h and /boot/System.map.
# Redhat systems typically create this file at boot time.
allow initrc_t boot_t:lnk_file rw_file_perms;

allow initrc_t tmpfs_t:chr_file rw_file_perms;
allow initrc_t tmpfs_t:dir r_dir_perms;

#
# readahead asks for these
#
allow initrc_t etc_aliases_t:file { getattr read };
allow initrc_t var_lib_nfs_t:file { getattr read };

')dnl end distro_redhat

#
# Shutting down xinet causes these
#
# Fam
dontaudit initrc_t device_t:dir { read write };
# 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;
dontaudit initrc_t proc_kmsg_t:file getattr;
') dnl end TODO

#################################
#
# Run_init local policy
#

tunable_policy(`targeted_policy',`
# targeted/unconfined stuff
',`
corecommands_execute_general_programs(run_init_t)
corecommands_execute_shell(run_init_t)

filesystem_get_persistent_filesystem_attributes(run_init_t)

files_read_general_system_config(run_init_t)

libraries_use_dynamic_loader(run_init_t)
libraries_read_shared_libraries(run_init_t)

selinux_read_config(run_init_t)
selinux_read_default_contexts(run_init_t)

authlogin_ignore_read_shadow_passwords(run_init_t)

miscfiles_read_localization(run_init_t)

logging_send_system_log_message(run_init_t)

allow run_init_t initrc_t:process transition;
allow run_init_t initrc_exec_t:file { getattr read execute };

# for utmp
allow run_init_t initrc_var_run_t:file { getattr read write };

allow run_init_t self:process setexec;
allow run_init_t self:capability setuid;

allow run_init_t self:fifo_file { getattr read write };

# often the administrator runs such programs from a directory that is owned
# by a different user or has restrictive SE permissions, do not want to audit
# the failed access to the current directory
dontaudit run_init_t self:capability { dac_override dac_read_search };

devices_ignore_list_device_nodes(run_init_t)
terminal_ignore_list_pseudoterminals(run_init_t)

# often the administrator runs such programs from a directory that is owned
# by a different user or has restrictive SE permissions, do not want to audit
# the failed access to the current directory
files_ignore_search_all_directories(run_init_t)

') dnl end ifdef targeted policy


ifdef(`TODO',`

tunable_policy(`targeted_policy', `
domain_auto_trans(unconfined_t, initrc_exec_t, initrc_t)
allow unconfined_t initrc_t:dbus { acquire_svc send_msg };
allow initrc_t unconfined_t:dbus { acquire_svc send_msg };
domain_trans(initrc_t, shell_exec_t, unconfined_t)
', `
domain_auto_trans(sysadm_t, run_init_exec_t, run_init_t)
role sysadm_r types run_init_t;

domain_auto_trans(run_init_t, chkpwd_exec_t, sysadm_chkpwd_t)

# for utmp
allow run_init_t admin_tty_type:chr_file rw_file_perms;

allow run_init_t privfd:fd use;
allow run_init_t lib_t:file { getattr read };

') dnl endif targeted policy

tunable_policy(`distro_gentoo', `
# Gentoo integrated run_init+open_init_pty-runscript:
domain_auto_trans(sysadm_t,initrc_exec_t,run_init_t)
')

') dnl end TODO