policy_module(kernel,1.2.1)

########################################

#

# Declarations

#

# assertion related attributes

attribute can_load_kernmodule;

attribute can_receive_kernel_messages;

neverallow ~can_load_kernmodule self:capability sys_module;

# domains with unconfined access to kernel resources

attribute kern_unconfined;

# regular entries in proc

attribute proc_type;

# sysctls

attribute sysctl_type;

role system_r;

role sysadm_r;

role staff_r;

role user_r;

ifdef(`enable_mls',`

	role secadm_r;

')

#

# kernel_t is the domain of kernel threads.

# It is also the target type when checking permissions in the system class.

# 

type kernel_t, can_load_kernmodule;

domain_base_type(kernel_t)

mls_rangetrans_source(kernel_t)

role system_r types kernel_t;

sid kernel gen_context(system_u:system_r:kernel_t,s15:c0.c255)

#

# DebugFS

#

type debugfs_t;

fs_type(debugfs_t)

allow debugfs_t self:filesystem associate;

genfscon debugfs / gen_context(system_u:object_r:debugfs_t,s0)

#

# Procfs types

#

type proc_t, proc_type;

files_mountpoint(proc_t)

fs_type(proc_t)

genfscon proc / gen_context(system_u:object_r:proc_t,s0)

genfscon proc /sysvipc gen_context(system_u:object_r:proc_t,s0)

# kernel message interface

type proc_kmsg_t, proc_type;

genfscon proc /kmsg gen_context(system_u:object_r:proc_kmsg_t,s15:c0.c255)

neverallow ~can_receive_kernel_messages proc_kmsg_t:file ~getattr;

# /proc kcore: inaccessible

type proc_kcore_t, proc_type;

neverallow { domain -kern_unconfined } proc_kcore_t:file ~getattr;

genfscon proc /kcore gen_context(system_u:object_r:proc_kcore_t,s15:c0.c255)

type proc_mdstat_t, proc_type;

genfscon proc /mdstat gen_context(system_u:object_r:proc_mdstat_t,s0)

type proc_net_t, proc_type;

genfscon proc /net gen_context(system_u:object_r:proc_net_t,s0)

#

# Sysctl types

#

# /proc/sys directory, base directory of sysctls

type sysctl_t, sysctl_type;

files_mountpoint(sysctl_t)

sid sysctl gen_context(system_u:object_r:sysctl_t,s0)

genfscon proc /sys gen_context(system_u:object_r:sysctl_t,s0)

# /proc/irq directory and files

type sysctl_irq_t, sysctl_type;

genfscon proc /irq gen_context(system_u:object_r:sysctl_irq_t,s0)

# /proc/net/rpc directory and files

type sysctl_rpc_t, sysctl_type;

genfscon proc /net/rpc gen_context(system_u:object_r:sysctl_rpc_t,s0)

# /proc/sys/fs directory and files

type sysctl_fs_t, sysctl_type;

files_mountpoint(sysctl_fs_t)

genfscon proc /sys/fs gen_context(system_u:object_r:sysctl_fs_t,s0)

# /proc/sys/kernel directory and files

type sysctl_kernel_t, sysctl_type;

genfscon proc /sys/kernel gen_context(system_u:object_r:sysctl_kernel_t,s0)

# /proc/sys/kernel/modprobe file

type sysctl_modprobe_t, sysctl_type;

genfscon proc /sys/kernel/modprobe gen_context(system_u:object_r:sysctl_modprobe_t,s0)

# /proc/sys/kernel/hotplug file

type sysctl_hotplug_t, sysctl_type;

genfscon proc /sys/kernel/hotplug gen_context(system_u:object_r:sysctl_hotplug_t,s0)

# /proc/sys/net directory and files

type sysctl_net_t, sysctl_type;

genfscon proc /sys/net gen_context(system_u:object_r:sysctl_net_t,s0)

# /proc/sys/net/unix directory and files

type sysctl_net_unix_t, sysctl_type;

genfscon proc /sys/net/unix gen_context(system_u:object_r:sysctl_net_unix_t,s0)

# /proc/sys/vm directory and files

type sysctl_vm_t, sysctl_type;

genfscon proc /sys/vm gen_context(system_u:object_r:sysctl_vm_t,s0)

# /proc/sys/dev directory and files

type sysctl_dev_t, sysctl_type;

genfscon proc /sys/dev gen_context(system_u:object_r:sysctl_dev_t,s0)

#

# unlabeled_t is the type of unlabeled objects.

# Objects that have no known labeling information or that

# have labels that are no longer valid are treated as having this type.

#

type unlabeled_t;

sid unlabeled gen_context(system_u:object_r:unlabeled_t,s15:c0.c255)

# These initial sids are no longer used, and can be removed:

sid any_socket		gen_context(system_u:object_r:unlabeled_t,s15:c0.c255)

sid file_labels		gen_context(system_u:object_r:unlabeled_t,s0)

sid icmp_socket		gen_context(system_u:object_r:unlabeled_t,s15:c0.c255)

sid igmp_packet		gen_context(system_u:object_r:unlabeled_t,s15:c0.c255)

sid init			gen_context(system_u:object_r:unlabeled_t,s0)

sid kmod			gen_context(system_u:object_r:unlabeled_t,s15:c0.c255)

sid netmsg		gen_context(system_u:object_r:unlabeled_t,s15:c0.c255)

sid policy		gen_context(system_u:object_r:unlabeled_t,s15:c0.c255)

sid scmp_packet		gen_context(system_u:object_r:unlabeled_t,s15:c0.c255)

sid sysctl_modprobe 	gen_context(system_u:object_r:unlabeled_t,s0)

sid sysctl_fs		gen_context(system_u:object_r:unlabeled_t,s0)

sid sysctl_kernel	gen_context(system_u:object_r:unlabeled_t,s0)

sid sysctl_net		gen_context(system_u:object_r:unlabeled_t,s0)

sid sysctl_net_unix	gen_context(system_u:object_r:unlabeled_t,s0)

sid sysctl_vm		gen_context(system_u:object_r:unlabeled_t,s0)

sid sysctl_dev		gen_context(system_u:object_r:unlabeled_t,s0)

sid tcp_socket		gen_context(system_u:object_r:unlabeled_t,s15:c0.c255)

########################################

#

# kernel local policy

#

# Use capabilities. need to investigate which capabilities are actually used

allow kernel_t self:capability *;

# Other possible mount points for the root fs are in files

allow kernel_t unlabeled_t:dir mounton;

# old general_domain_access()

allow kernel_t self:process ~{ ptrace setcurrent setexec setfscreate setrlimit execmem execstack execheap };

allow kernel_t self:shm create_shm_perms;

allow kernel_t self:sem create_sem_perms;

allow kernel_t self:msg { send receive };

allow kernel_t self:msgq create_msgq_perms;

allow kernel_t self:unix_dgram_socket create_socket_perms;

allow kernel_t self:unix_stream_socket create_stream_socket_perms;

allow kernel_t self:unix_dgram_socket sendto;

allow kernel_t self:unix_stream_socket connectto;

allow kernel_t self:fifo_file rw_file_perms;

allow kernel_t self:sock_file r_file_perms;

allow kernel_t self:fd use;

# old general_proc_read_access():

allow kernel_t proc_t:dir r_dir_perms;

allow kernel_t proc_t:{ lnk_file file } r_file_perms;

allow kernel_t proc_net_t:dir r_dir_perms;

allow kernel_t proc_net_t:file r_file_perms;

allow kernel_t proc_mdstat_t:file r_file_perms;

allow kernel_t proc_kcore_t:file getattr;

allow kernel_t proc_kmsg_t:file getattr;

allow kernel_t sysctl_t:dir r_dir_perms;

allow kernel_t sysctl_kernel_t:dir r_dir_perms;

allow kernel_t sysctl_kernel_t:file r_file_perms;

# cjp: this seems questionable

allow kernel_t unlabeled_t:fifo_file rw_file_perms;

corenet_non_ipsec_sendrecv(kernel_t)

# Kernel-generated traffic e.g., ICMP replies:

corenet_raw_sendrecv_all_if(kernel_t)

corenet_raw_sendrecv_all_nodes(kernel_t)

corenet_raw_send_generic_if(kernel_t)

# Kernel-generated traffic e.g., TCP resets:

corenet_tcp_sendrecv_all_if(kernel_t)

corenet_tcp_sendrecv_all_nodes(kernel_t)

corenet_raw_send_generic_node(kernel_t)

corenet_raw_send_multicast_node(kernel_t)

dev_read_sysfs(kernel_t)

dev_search_usbfs(kernel_t)

# Mount root file system.  Used when loading a policy

# from initrd, then mounting the root filesystem

fs_mount_all_fs(kernel_t)

selinux_load_policy(kernel_t)

term_use_console(kernel_t)

corecmd_exec_shell(kernel_t)

corecmd_list_sbin(kernel_t)

# /proc/sys/kernel/modprobe is set to /bin/true if not using modules.

corecmd_exec_bin(kernel_t)

domain_signal_all_domains(kernel_t)

domain_search_all_domains_state(kernel_t)

files_list_root(kernel_t)

files_list_etc(kernel_t)

files_list_home(kernel_t)

files_read_usr_files(kernel_t)

mls_process_read_up(kernel_t)

mls_process_write_down(kernel_t)

ifdef(`targeted_policy',`

	unconfined_domain(kernel_t)

')

tunable_policy(`read_default_t',`

	files_list_default(kernel_t)

	files_read_default_files(kernel_t)

	files_read_default_symlinks(kernel_t)

	files_read_default_sockets(kernel_t)

	files_read_default_pipes(kernel_t)

')

optional_policy(`hotplug',`

	hotplug_search_config(kernel_t)

')

optional_policy(`init',`

	init_sigchld(kernel_t)

')

optional_policy(`libraries',`

	libs_use_ld_so(kernel_t)

	libs_use_shared_libs(kernel_t)

')

optional_policy(`logging',`

	logging_send_syslog_msg(kernel_t)

')

optional_policy(`nis',`

	nis_use_ypbind(kernel_t)

')

optional_policy(`portmap',`

	portmap_udp_send(kernel_t)

')

optional_policy(`rpc',`

	# nfs kernel server needs kernel UDP access.  It is less risky and painful

	# to just give it everything.

	allow kernel_t self:tcp_socket create_stream_socket_perms;

	allow kernel_t self:udp_socket { connect };

	allow kernel_t self:tcp_socket connected_socket_perms;

	allow kernel_t self:udp_socket connected_socket_perms;

	# nfs kernel server needs kernel UDP access.  It is less risky and painful

	# to just give it everything.

	corenet_udp_sendrecv_all_if(kernel_t)

	corenet_udp_sendrecv_all_nodes(kernel_t)

	corenet_tcp_bind_all_nodes(kernel_t)

	corenet_udp_bind_all_nodes(kernel_t)

	corenet_tcp_sendrecv_all_ports(kernel_t)

	corenet_udp_sendrecv_all_ports(kernel_t)

	auth_dontaudit_getattr_shadow(kernel_t)

	sysnet_read_config(kernel_t)

	rpc_manage_nfs_ro_content(kernel_t)

	rpc_manage_nfs_rw_content(kernel_t)

	rpc_udp_rw_nfs_sockets(kernel_t) 

	rpc_udp_send_nfs(kernel_t)

	tunable_policy(`nfs_export_all_ro',`

		fs_list_noxattr_fs(kernel_t) 

		fs_read_noxattr_fs_files(kernel_t) 

		fs_read_noxattr_fs_symlinks(kernel_t) 

		auth_read_all_dirs_except_shadow(kernel_t) 

		auth_read_all_files_except_shadow(kernel_t) 

		auth_read_all_symlinks_except_shadow(kernel_t) 

	')

	tunable_policy(`nfs_export_all_rw',`

		fs_list_noxattr_fs(kernel_t) 

		fs_read_noxattr_fs_files(kernel_t) 

		fs_read_noxattr_fs_symlinks(kernel_t) 

		auth_manage_all_files_except_shadow(kernel_t)

	')

')

optional_policy(`selinuxutil',`

	seutil_read_config(kernel_t)

	seutil_read_bin_policy(kernel_t)

')

########################################

#

# Unlabeled process local policy

#

ifdef(`targeted_policy',`

	allow unlabeled_t self:filesystem associate;

')

optional_policy(`init',`

	# 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.

	init_sigchld(unlabeled_t)

')