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

policy_module(bootloader,1.0)

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

attribute rw_kern_modules;

#
# boot_t is the type for files in /boot
#
type boot_t;
files_type(boot_t)
files_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_type(boot_runtime_t)

type bootloader_t;
domain_type(bootloader_t)
role system_r types bootloader_t;

type bootloader_exec_t;
domain_entry_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_type(bootloader_etc_t)

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

# kernel modules
type modules_object_t;
files_type(modules_object_t)

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

#
# system_map_t is for the system.map files in /boot
#
type system_map_t;
files_type(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 };

allow bootloader_t boot_t:dir ra_dir_perms;
allow bootloader_t boot_t:file { rw_file_perms create };
allow bootloader_t boot_t:lnk_file { r_file_perms create unlink };

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

allow bootloader_t bootloader_tmp_t:dir create_dir_perms;
allow bootloader_t bootloader_tmp_t:file create_file_perms;
allow bootloader_t bootloader_tmp_t:chr_file create_file_perms;
allow bootloader_t bootloader_tmp_t:blk_file create_file_perms;
allow bootloader_t bootloader_tmp_t:lnk_file create_lnk_perms;
files_create_tmp_files(bootloader_t,bootloader_tmp_t,{ dir file lnk_file chr_file blk_file })
# for tune2fs (cjp: ?)
files_create_root(bootloader_t,bootloader_tmp_t)

allow bootloader_t modules_object_t:dir r_dir_perms;
allow bootloader_t modules_object_t:file r_file_perms;
allow bootloader_t modules_object_t:lnk_file r_file_perms;

kernel_getattr_core(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)

dev_getattr_all_chr_files(bootloader_t)
dev_setattr_all_blk_files(bootloader_t)
dev_dontaudit_rw_generic_dev_nodes(bootloader_t)
dev_read_rand(bootloader_t)
dev_read_urand(bootloader_t)
dev_getattr_sysfs_dir(bootloader_t)
# for reading BIOS data
dev_read_raw_memory(bootloader_t)

fs_getattr_xattr_fs(bootloader_t)

term_getattr_all_user_ttys(bootloader_t)
term_dontaudit_manage_pty_dir(bootloader_t)

corecmd_exec_bin(bootloader_t)
corecmd_exec_sbin(bootloader_t)
corecmd_exec_shell(bootloader_t)

domain_exec_all_entry_files(bootloader_t)
domain_use_wide_inherit_fd(bootloader_t)

files_read_etc_files(bootloader_t)
files_read_etc_runtime_files(bootloader_t)
files_read_usr_src_files(bootloader_t)
files_read_usr_files(bootloader_t)
files_read_var_files(bootloader_t)
# for nscd
files_dontaudit_search_pids(bootloader_t)

init_getattr_initctl(bootloader_t)
init_use_script_pty(bootloader_t)
init_use_script_fd(bootloader_t)
init_rw_script_pipe(bootloader_t)

libs_use_ld_so(bootloader_t)
libs_use_shared_libs(bootloader_t)
libs_read_lib(bootloader_t)

logging_send_syslog_msg(bootloader_t)
logging_rw_generic_logs(bootloader_t)

miscfiles_read_localization(bootloader_t)

seutil_read_binary_pol(bootloader_t)
seutil_read_loadpol(bootloader_t)
seutil_dontaudit_search_config(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;

	fs_list_tmpfs(bootloader_t)

	files_relabelto_usr_files(bootloader_t)
	files_search_var_lib(bootloader_t)
	# for /usr/share/initrd-tools/scripts
	files_exec_usr_files(bootloader_t)

	fstools_manage_entry_files(bootloader_t)
	fstools_relabelto_entry_files(bootloader_t)

	init_list_script_pids(bootloader_t)

	libs_relabelto_lib_files(bootloader_t)
')

ifdef(`distro_redhat',`
	# for memlock
	allow bootloader_t self:capability ipc_lock;

	# new file system defaults to file_t, granting file_t access is still bad.
	allow bootloader_t boot_runtime_t:file { r_file_perms unlink };

	# mkinitrd mount initrd on bootloader temp dir
	files_mountpoint(bootloader_tmp_t)

	# new file system defaults to file_t, granting file_t access is still bad.
	files_manage_isid_type_dir(bootloader_t)
	files_manage_isid_type_file(bootloader_t)
	files_manage_isid_type_symlink(bootloader_t)
	files_manage_isid_type_blk_node(bootloader_t)
	files_manage_isid_type_chr_node(bootloader_t)

	# for mke2fs
	mount_domtrans(bootloader_t)
')

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

optional_policy(`lvm.te',`
	dev_rw_lvm_control(bootloader_t)

	lvm_domtrans(bootloader_t)
	lvm_read_config(bootloader_t)
')

optional_policy(`modutils.te',`
	modutils_exec_insmod(insmod_t)
	modutils_read_mods_deps(bootloader_t)
	modutils_read_module_conf(bootloader_t)
	modutils_exec_insmod(bootloader_t)
	modutils_exec_depmod(bootloader_t)
	modutils_exec_update_mods(bootloader_t)
')

optional_policy(`rpm.te',`
	rpm_rw_pipe(bootloader_t)
')

optional_policy(`userdomain.te',`
	userdom_dontaudit_search_staff_home_dir(bootloader_t)
	userdom_dontaudit_search_sysadm_home_dir(bootloader_t)
')

ifdef(`TODO',`
ifdef(`distro_debian', `
	# cjp: there is no setfscreate or type_transition, and
	# bootloader_t cannot rw a usr_t or lib_t directory, so
	# how can this work?  This is probably rw_file_perms,
	# possibly with unlink.  Files are probably "created"
	# by the above relabeling permissions.
	allow bootloader_t { usr_t lib_t }:file create_file_perms;

	allow bootloader_t dpkg_var_lib_t:dir r_dir_perms;
	allow bootloader_t dpkg_var_lib_t:file { getattr read };
')
') dnl end TODO