selinux-policy/refpolicy/policy/modules/kernel/bootloader.te

# Copyright (C) 2005 Tresys Technology, LLC

policy_module(bootloader,1.0)

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

attribute can_modify_kernel_modules;

#
# boot_t is the type for files in /boot
#
type boot_t;
files_make_file(boot_t)
files_make_mountpoint(boot_t)

#
# boot_runtime_t is the type for /boot/kernel.h,
# which is automatically generated at boot time.
# only for Red Hat
#
type boot_runtime_t;
files_make_file(boot_runtime_t)

type bootloader_t;
domain_make_domain(bootloader_t)

type bootloader_exec_t;
domain_make_entrypoint_file(bootloader_t,bootloader_exec_t)

#
# bootloader_etc_t is the configuration file,
# grub.conf, lilo.conf, etc.
#
type bootloader_etc_t alias etc_bootloader_t;
files_make_file(bootloader_etc_t)

#
# The temp file is used for initrd creation;
# it consists of files and device nodes
#
type bootloader_tmp_t;
files_make_file(bootloader_tmp_t)
devices_make_device_node(bootloader_tmp_t)

# kernel modules
type modules_object_t;
files_make_file(modules_object_t)

neverallow ~can_modify_kernel_modules modules_object_t:file { create append write };

#
# system_map_t is for the system.map files in /boot
#
type system_map_t;
files_make_file(system_map_t)

########################################
#
# bootloader local policy
#

allow bootloader_t self:capability { dac_read_search fsetid sys_rawio sys_admin mknod chown };
allow bootloader_t self:process { sigkill sigstop signull signal };
allow bootloader_t self:fifo_file { getattr read write };

kernel_get_core_interface_attributes(bootloader_t)
kernel_read_system_state(bootloader_t)
kernel_read_software_raid_state(bootloader_t)
kernel_read_kernel_sysctl(bootloader_t)

storage_raw_read_fixed_disk(bootloader_t)
storage_raw_write_fixed_disk(bootloader_t)
storage_raw_read_removable_device(bootloader_t)
storage_raw_write_removable_device(bootloader_t)

devices_get_all_character_device_attributes(bootloader_t)
devices_set_all_block_device_attributes(bootloader_t)
# for reading BIOS data (cjp: ?)
devices_raw_read_memory(bootloader_t)

init_get_control_channel_attributes(bootloader_t)
init_script_use_pseudoterminal(bootloader_t)
init_script_use_file_descriptors(bootloader_t)

domain_use_widely_inheritable_file_descriptors(bootloader_t)

libraries_use_dynamic_loader(bootloader_t)
libraries_read_shared_libraries(bootloader_t)

files_read_general_system_config(bootloader_t)
files_read_runtime_system_config(bootloader_t)
files_read_system_source_code(bootloader_t)

logging_send_system_log_message(bootloader_t)

# uncomment the following line if you use "lilo -p"
#files_create_private_config(bootloader_t,bootloader_etc_t)
#allow bootloader_t bootloader_etc_t:file { create ioctl read getattr lock write setattr append link unlink rename };

filesystem_get_persistent_filesystem_attributes(bootloader_t)

terminal_use_controlling_terminal(bootloader_t)
terminal_get_user_terminal_attributes(bootloader_t)

allow bootloader_t bootloader_etc_t:file { getattr read };

optional_policy(modutils.te,`
modutils_insmod_execute(insmod_t)
')

miscfiles_read_localization(bootloader_t)

devices_ignore_modify_generic_devices(bootloader_t)

########################################
#
# mkinitrd policy
#

allow bootloader_t modules_object_t:dir { getattr search read };
allow bootloader_t modules_object_t:file { getattr read };

files_read_general_system_resources(bootloader_t)
bootloader_install_initrd(bootloader_t)

devices_get_random_data(bootloader_t)
devices_get_pseudorandom_data(bootloader_t)

corecommands_execute_general_programs(bootloader_t)
corecommands_execute_system_programs(bootloader_t)
corecommands_execute_shell(bootloader_t)

selinux_read_binary_policy(bootloader_t)
selinux_read_load_policy_binary(bootloader_t)

modutils_read_kernel_module_dependencies(bootloader_t)
modutils_read_kernel_module_loading_config(bootloader_t)
modutils_insmod_execute(bootloader_t)
modutils_depmod_execute(bootloader_t)
modutils_update_modules_execute(bootloader_t)

logging_modify_system_logs(bootloader_t)

files_create_private_tmp_data(bootloader_t,bootloader_tmp_t,{ dir file lnk_file chr_file blk_file })
allow bootloader_t bootloader_tmp_t:dir { create read getattr lock setattr ioctl link unlink rename search add_name remove_name reparent write rmdir };
allow bootloader_t bootloader_tmp_t:file { create ioctl read getattr lock write setattr append link unlink rename };
allow bootloader_t bootloader_tmp_t:chr_file { create ioctl read getattr lock write setattr append link unlink rename };
allow bootloader_t bootloader_tmp_t:blk_file { create ioctl read getattr lock write setattr append link unlink rename };
allow bootloader_t bootloader_tmp_t:lnk_file { create read getattr setattr unlink rename };
# for tune2fs (cjp: ?)
files_create_private_root_dir_entry(bootloader_t,bootloader_tmp_t)

optional_policy(`fsadm.te', `
filesystemtools_execute(bootloader_t)
')

ifdef(`distro_debian', `
allow bootloader_t bootloader_tmp_t:{ dir file } { relabelfrom relabelto };
allow bootloader_t modules_object_t:file { relabelfrom relabelto unlink };
allow bootloader_t boot_t:file relabelfrom;
')

ifdef(`distro_redhat', `
files_make_mountpoint(bootloader_tmp_t)

# for mke2fs
mount_transition(bootloader_t)
allow bootloader_t modules_object_t:lnk_file { getattr read };

# new file system defaults to file_t, granting file_t access is still bad.
allow bootloader_t self:unix_stream_socket { create ioctl read getattr write setattr append bind getopt setopt shutdown };
allow bootloader_t boot_runtime_t:file { read getattr unlink };

# for memlock
devices_get_zeros(bootloader_t)
allow bootloader_t self:capability ipc_lock;
')

ifdef(`TODO',`

# admin runs bootloader:
domain_auto_trans(sysadm_t, bootloader_exec_t, bootloader_t)
allow bootloader_t admin_tty_type:chr_file rw_file_perms;

role system_r types bootloader_t;
allow bootloader_t initrc_t:fifo_file { read write };

allow bootloader_t lib_t:file { getattr read };

allow bootloader_t sysfs_t:dir getattr;

allow bootloader_t var_t:dir search;
allow bootloader_t var_t:file { getattr read };

# LVM2 / Device Mapper's /dev/mapper/control
# maybe we should change the labeling for this
optional_policy(`lvm.te', `
lvm_transition(bootloader_t)
allow bootloader_t lvm_control_t:chr_file rw_file_perms;
allow lvm_t bootloader_tmp_t:file rw_file_perms;
r_dir_file(bootloader_t, lvm_etc_t)
')

ifdef(`distro_debian', `
allow bootloader_t { usr_t lib_t fsadm_exec_t }:file relabelto;
allow bootloader_t { usr_t lib_t fsadm_exec_t }:file create_file_perms;
allow bootloader_t tmpfs_t:dir r_dir_perms;
allow bootloader_t initrc_var_run_t:dir r_dir_perms;
allow bootloader_t var_lib_t:dir search;
allow bootloader_t dpkg_var_lib_t:dir r_dir_perms;
allow bootloader_t dpkg_var_lib_t:file { getattr read };
# for /usr/share/initrd-tools/scripts
can_exec(bootloader_t, usr_t)
')

ifdef(`distro_redhat', `
# new file system defaults to file_t, granting file_t access is still bad.
allow bootloader_t file_t:dir create_dir_perms;
allow bootloader_t file_t:{ file blk_file chr_file } create_file_perms;
allow bootloader_t file_t:lnk_file create_lnk_perms;
')

dontaudit bootloader_t selinux_config_t:dir search;
dontaudit bootloader_t { staff_home_dir_t sysadm_home_dir_t }:dir search;
dontaudit bootloader_t devpts_t:dir create_dir_perms;
# for nscd
dontaudit bootloader_t var_run_t:dir search;

') dnl end TODO