selinux-policy/policy/constraints

#
# Define the constraints
#
# constrain class_set perm_set expression ;
#
# expression : ( expression ) 
#	     | not expression
#	     | expression and expression
#	     | expression or expression
#	     | u1 op u2
#	     | r1 role_op r2
#	     | t1 op t2
#	     | u1 op names
#	     | u2 op names
#	     | r1 op names
#	     | r2 op names
#	     | t1 op names
#	     | t2 op names
#
# op : == | != 
# role_op : == | != | eq | dom | domby | incomp
#
# names : name | { name_list }
# name_list : name | name_list name		
#

define(`basic_ubac_conditions',`
	ifdef(`enable_ubac',`
		u1 == u2
		or u1 == system_u
		or u2 == system_u
		or t1 != ubac_constrained_type
		or t2 != ubac_constrained_type
	')
')

define(`basic_ubac_constraint',`
	ifdef(`enable_ubac',`
		constrain $1 all_$1_perms
		(
			basic_ubac_conditions
		);
	')
')

define(`exempted_ubac_constraint',`
	ifdef(`enable_ubac',`
		constrain $1 all_$1_perms
		(
			basic_ubac_conditions
			or t1 == $2
		);
	')
')

########################################
#
# File rules
#

exempted_ubac_constraint(dir, ubacfile)
exempted_ubac_constraint(file, ubacfile)
exempted_ubac_constraint(lnk_file, ubacfile)
exempted_ubac_constraint(fifo_file, ubacfile)
exempted_ubac_constraint(sock_file, ubacfile)
exempted_ubac_constraint(chr_file, ubacfile)
exempted_ubac_constraint(blk_file, ubacfile)

# SElinux object identity change constraint:
constrain dir_file_class_set { create relabelto relabelfrom } 
(
	u1 == u2
	or t1 == can_change_object_identity
);

########################################
#
# Process rules
#

ifdef(`enable_ubac',`
	constrain process { sigchld sigkill sigstop signull signal ptrace getsched setsched getsession getpgid setpgid getcap setcap share getattr setrlimit }
	(
		basic_ubac_conditions
		or t1 == ubacproc
	);
')

constrain process { transition noatsecure siginh rlimitinh }
(
	u1 == u2
	or ( t1 == can_change_process_identity and t2 == process_user_target )
       	or ( t1 == cron_source_domain and ( t2 == cron_job_domain or u2 == system_u ) )
	or ( t1 == can_system_change and u2 == system_u )
	or ( t1 == process_uncond_exempt )
);

constrain process { transition noatsecure siginh rlimitinh }
(
	r1 == r2
	or ( t1 == can_change_process_identity and t2 == process_user_target )
	or ( t1 == cron_source_domain and ( t2 == cron_job_domain or u2 == system_u ) )
	or ( t1 == can_system_change and u2 == system_u )
	or ( t1 == process_uncond_exempt )
);

constrain process dyntransition
(
	u1 == u2 and r1 == r2
);

# These permissions do not have ubac constraints:
# fork
# setexec
# setfscreate
# setcurrent
# execmem
# execstack
# execheap
# setkeycreate
# setsockcreate

########################################
#
# File descriptor rules
#

exempted_ubac_constraint(fd, ubacfd)

########################################
#
# Socket rules
#

exempted_ubac_constraint(socket, ubacsock)
exempted_ubac_constraint(tcp_socket, ubacsock)
exempted_ubac_constraint(udp_socket, ubacsock)
exempted_ubac_constraint(rawip_socket, ubacsock)
exempted_ubac_constraint(netlink_socket, ubacsock)
exempted_ubac_constraint(packet_socket, ubacsock)
exempted_ubac_constraint(key_socket, ubacsock)
exempted_ubac_constraint(unix_stream_socket, ubacsock)
exempted_ubac_constraint(unix_dgram_socket, ubacsock)
exempted_ubac_constraint(netlink_route_socket, ubacsock)
exempted_ubac_constraint(netlink_firewall_socket, ubacsock)
exempted_ubac_constraint(netlink_tcpdiag_socket, ubacsock)
exempted_ubac_constraint(netlink_nflog_socket, ubacsock)
exempted_ubac_constraint(netlink_xfrm_socket, ubacsock)
exempted_ubac_constraint(netlink_selinux_socket, ubacsock)
exempted_ubac_constraint(netlink_audit_socket, ubacsock)
exempted_ubac_constraint(netlink_ip6fw_socket, ubacsock)
exempted_ubac_constraint(netlink_dnrt_socket, ubacsock)
exempted_ubac_constraint(netlink_kobject_uevent_socket, ubacsock)
exempted_ubac_constraint(appletalk_socket, ubacsock)
exempted_ubac_constraint(dccp_socket, ubacsock)

constrain socket_class_set { create relabelto relabelfrom } 
(
	u1 == u2
	or t1 == can_change_object_identity
);

########################################
#
# SysV IPC rules

exempted_ubac_constraint(sem, ubacipc)
exempted_ubac_constraint(msg, ubacipc)
exempted_ubac_constraint(msgq, ubacipc)
exempted_ubac_constraint(shm, ubacipc)
exempted_ubac_constraint(ipc, ubacipc)

########################################
#
# SE-X Windows rules
#

exempted_ubac_constraint(x_drawable, ubacxwin)
exempted_ubac_constraint(x_screen, ubacxwin)
exempted_ubac_constraint(x_gc, ubacxwin)
exempted_ubac_constraint(x_font, ubacxwin)
exempted_ubac_constraint(x_colormap, ubacxwin)
exempted_ubac_constraint(x_property, ubacxwin)
exempted_ubac_constraint(x_selection, ubacxwin)
exempted_ubac_constraint(x_cursor, ubacxwin)
exempted_ubac_constraint(x_client, ubacxwin)
exempted_ubac_constraint(x_device, ubacxwin)
exempted_ubac_constraint(x_server, ubacxwin)
exempted_ubac_constraint(x_extension, ubacxwin)
exempted_ubac_constraint(x_resource, ubacxwin)
exempted_ubac_constraint(x_event, ubacxwin)
exempted_ubac_constraint(x_synthetic_event, ubacxwin)
exempted_ubac_constraint(x_application_data, ubacxwin)

########################################
#
# D-BUS rules
#

exempted_ubac_constraint(dbus, ubacdbus)

########################################
#
# Key rules
#

exempted_ubac_constraint(key, ubackey)

########################################
#
# Database rules
#

exempted_ubac_constraint(db_database, ubacdb)
exempted_ubac_constraint(db_table, ubacdb)
exempted_ubac_constraint(db_procedure, ubacdb)
exempted_ubac_constraint(db_column, ubacdb)
exempted_ubac_constraint(db_tuple, ubacdb)
exempted_ubac_constraint(db_blob, ubacdb)



basic_ubac_constraint(association)
basic_ubac_constraint(peer)


# these classes have no UBAC restrictions
#class security
#class system
#class capability
#class memprotect
#class passwd			# userspace
#class node
#class netif
#class packet
#class capability2
#class nscd			# userspace
#class context			# userspace



undefine(`basic_ubac_constraint')
undefine(`basic_ubac_conditions')
undefine(`exempted_ubac_constraint')