selinux-refpolicy/policy/flask/access_vectors
Stephen Smalley 5fd175fa45 Rename obsolete netlink_firewall_socket and netlink_ip6fw_socket classes
The implementation for NETLINK_FIREWALL and NETLINK_IP6_FW protocols
was removed from the kernel in commit
d16cf20e2f2f13411eece7f7fb72c17d141c4a84 ("netfilter: remove ip_queue
support") circa Linux 3.5.  Consequently, kernels >= 3.5 should never
perform permission checks on these classes although they remained
defined in the SELinux kernel classmap until the netlink classes
were updated by
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=6c6d2e9bde1c1c87a7ead806f8f5e2181d41a652
circa Linux v4.2.

Removing these class definitions would break legacy userspace that relies
upon stable values for the userspace security class definitions since it
will perturb those values by removing classes that preceded them.  dbus-daemon
in particular is known to break if its dbus class changes at runtime,
which could occur upon a policy reload that removes these classes.
Fixing this requires ensuring that dbus-daemon looks up the appropriate
class value on each use or upon policy reload, via userspace interfaces
such as selinux_check_access(), string_to_security_class(), and/or
selinux_set_callback(SELINUX_CB_POLICYLOAD, ...) with a callback function
that remaps the class value if needed.  Other userspace policy enforcers
are believed to have been updated in recent versions but older versions
may break upon such a change.

Hence, this change renames these classes with obsolete_ prefixes and
removes all rules referencing them from refpolicy, thereby preserving
the class numbering for subsequent classes while making it clear that
these classses are no longer meaningful for modern kernels.

This change does however create a potential compatibility break for
kernels < 3.5, since the policy will cease to define the kernel class
names and therefore the kernel will handle permission checks on the
class based on the handle_unknown setting in policy.  For most
Linux distributions, this will default to allow and therefore avoid
breaking userspace but will fail open.  For kernels < 2.6.33 (i.e.
the dynamic class/perm discovery support), the presence of a class
in policy with the same number but a different name than the kernel
class will cause the policy load to fail entirely.

Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
2020-01-16 09:17:56 -05:00

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#
# Define common prefixes for access vectors
#
# common common_name { permission_name ... }
#
# Define a common prefix for file access vectors.
#
common file
{
ioctl
read
write
create
getattr
setattr
lock
relabelfrom
relabelto
append
map
unlink
link
rename
execute
quotaon
mounton
audit_access
open
execmod
watch
watch_mount
watch_sb
watch_with_perm
watch_reads
}
#
# Define a common prefix for socket access vectors.
#
common socket
{
# inherited from file
ioctl
read
write
create
getattr
setattr
lock
relabelfrom
relabelto
append
map
# socket-specific
bind
connect
listen
accept
getopt
setopt
shutdown
recvfrom
sendto
name_bind
}
#
# Define a common prefix for ipc access vectors.
#
common ipc
{
create
destroy
getattr
setattr
read
write
associate
unix_read
unix_write
}
#
# Define a common prefix for userspace database object access vectors.
#
common database
{
create
drop
getattr
setattr
relabelfrom
relabelto
}
#
# Define a common prefix for pointer and keyboard access vectors.
#
common x_device
{
getattr
setattr
use
read
write
getfocus
setfocus
bell
force_cursor
freeze
grab
manage
list_property
get_property
set_property
add
remove
create
destroy
}
#
# Define a common for capability access vectors.
#
common cap
{
# The capabilities are defined in include/linux/capability.h
# Capabilities >= 32 are defined in the cap2 common.
# Care should be taken to ensure that these are consistent with
# those definitions. (Order matters)
chown
dac_override
dac_read_search
fowner
fsetid
kill
setgid
setuid
setpcap
linux_immutable
net_bind_service
net_broadcast
net_admin
net_raw
ipc_lock
ipc_owner
sys_module
sys_rawio
sys_chroot
sys_ptrace
sys_pacct
sys_admin
sys_boot
sys_nice
sys_resource
sys_time
sys_tty_config
mknod
lease
audit_write
audit_control
setfcap
}
common cap2
{
mac_override # unused by SELinux
mac_admin
syslog
wake_alarm
block_suspend
audit_read
}
#
# Define the access vectors.
#
# class class_name [ inherits common_name ] { permission_name ... }
#
# Define the access vector interpretation for file-related objects.
#
class filesystem
{
mount
remount
unmount
getattr
relabelfrom
relabelto
associate
quotamod
quotaget
watch
}
class dir
inherits file
{
add_name
remove_name
reparent
search
rmdir
}
class file
inherits file
{
execute_no_trans
entrypoint
}
class lnk_file
inherits file
class chr_file
inherits file
class blk_file
inherits file
class sock_file
inherits file
class fifo_file
inherits file
class fd
{
use
}
#
# Define the access vector interpretation for network-related objects.
#
class socket
inherits socket
class tcp_socket
inherits socket
{
node_bind
name_connect
}
class udp_socket
inherits socket
{
node_bind
}
class rawip_socket
inherits socket
{
node_bind
}
class node
{
recvfrom
sendto
}
class netif
{
ingress
egress
}
class netlink_socket
inherits socket
class packet_socket
inherits socket
class key_socket
inherits socket
class unix_stream_socket
inherits socket
{
connectto
}
class unix_dgram_socket
inherits socket
#
# Define the access vector interpretation for process-related objects
#
class process
{
fork
transition
sigchld # commonly granted from child to parent
sigkill # cannot be caught or ignored
sigstop # cannot be caught or ignored
signull # for kill(pid, 0)
signal # all other signals
ptrace
getsched
setsched
getsession
getpgid
setpgid
getcap
setcap
share
getattr
setexec
setfscreate
noatsecure
siginh
setrlimit
rlimitinh
dyntransition
setcurrent
execmem
execstack
execheap
setkeycreate
setsockcreate
getrlimit
}
class process2
{
nnp_transition
nosuid_transition
}
#
# Define the access vector interpretation for ipc-related objects
#
class ipc
inherits ipc
class sem
inherits ipc
class msgq
inherits ipc
{
enqueue
}
class msg
{
send
receive
}
class shm
inherits ipc
{
lock
}
#
# Define the access vector interpretation for the security server.
#
class security
{
compute_av
compute_create
compute_member
check_context
load_policy
compute_relabel
compute_user
setenforce # was avc_toggle in system class
setbool
setsecparam
setcheckreqprot
read_policy
validate_trans
}
#
# Define the access vector interpretation for system operations.
#
class system
{
ipc_info
syslog_read
syslog_mod
syslog_console
module_request
module_load
# these are overloaded userspace
# permissions from systemd
halt
reboot
status
start
stop
enable
disable
reload
}
#
# Define the access vector interpretation for controlling capabilities
#
class capability
inherits cap
class capability2
inherits cap2
#
# Define the access vector interpretation for controlling
# changes to passwd information.
#
class passwd
{
passwd # change another user passwd
chfn # change another user finger info
chsh # change another user shell
rootok # pam_rootok check (skip auth)
crontab # crontab on another user
}
#
# SE-X Windows stuff
#
class x_drawable
{
create
destroy
read
write
blend
getattr
setattr
list_child
add_child
remove_child
list_property
get_property
set_property
manage
override
show
hide
send
receive
}
class x_screen
{
getattr
setattr
hide_cursor
show_cursor
saver_getattr
saver_setattr
saver_hide
saver_show
}
class x_gc
{
create
destroy
getattr
setattr
use
}
class x_font
{
create
destroy
getattr
add_glyph
remove_glyph
use
}
class x_colormap
{
create
destroy
read
write
getattr
add_color
remove_color
install
uninstall
use
}
class x_property
{
create
destroy
read
write
append
getattr
setattr
}
class x_selection
{
read
write
getattr
setattr
}
class x_cursor
{
create
destroy
read
write
getattr
setattr
use
}
class x_client
{
destroy
getattr
setattr
manage
}
class x_device
inherits x_device
class x_server
{
getattr
setattr
record
debug
grab
manage
}
class x_extension
{
query
use
}
class x_resource
{
read
write
}
class x_event
{
send
receive
}
class x_synthetic_event
{
send
receive
}
#
# Extended Netlink classes
#
class netlink_route_socket
inherits socket
{
nlmsg_read
nlmsg_write
}
class obsolete_netlink_firewall_socket
inherits socket
{
nlmsg_read
nlmsg_write
}
class netlink_tcpdiag_socket
inherits socket
{
nlmsg_read
nlmsg_write
}
class netlink_nflog_socket
inherits socket
class netlink_xfrm_socket
inherits socket
{
nlmsg_read
nlmsg_write
}
class netlink_selinux_socket
inherits socket
class netlink_audit_socket
inherits socket
{
nlmsg_read
nlmsg_write
nlmsg_relay
nlmsg_readpriv
nlmsg_tty_audit
}
class obsolete_netlink_ip6fw_socket
inherits socket
{
nlmsg_read
nlmsg_write
}
class netlink_dnrt_socket
inherits socket
# Define the access vector interpretation for controlling
# access and communication through the D-BUS messaging
# system.
#
class dbus
{
acquire_svc
send_msg
}
# Define the access vector interpretation for controlling
# access through the name service cache daemon (nscd).
#
class nscd
{
getpwd
getgrp
gethost
getstat
admin
shmempwd
shmemgrp
shmemhost
getserv
shmemserv
}
# Define the access vector interpretation for controlling
# access to IPSec network data by association
#
class association
{
sendto
recvfrom
setcontext
polmatch
}
# Updated Netlink class for KOBJECT_UEVENT family.
class netlink_kobject_uevent_socket
inherits socket
class appletalk_socket
inherits socket
class packet
{
send
recv
relabelto
forward_in
forward_out
}
class key
{
view
read
write
search
link
setattr
create
}
class context
{
unused_perm
contains
}
class dccp_socket
inherits socket
{
node_bind
name_connect
}
class memprotect
{
mmap_zero
}
class db_database
inherits database
{
access
install_module
load_module
get_param # deprecated
set_param # deprecated
}
class db_table
inherits database
{
select
update
insert
delete
lock
}
class db_procedure
inherits database
{
execute
entrypoint
install
}
class db_column
inherits database
{
select
update
insert
}
class db_tuple
{
relabelfrom
relabelto
use
select
update
insert
delete
}
class db_blob
inherits database
{
read
write
import
export
}
class db_exception
inherits database
{
use
}
class db_datatype
inherits database
{
use
}
# network peer labels
class peer
{
recv
}
class x_application_data
{
paste
paste_after_confirm
copy
}
class kernel_service
{
use_as_override
create_files_as
}
class tun_socket
inherits socket
{
attach_queue
}
class binder
{
impersonate
call
set_context_mgr
transfer
}
class netlink_iscsi_socket
inherits socket
class netlink_fib_lookup_socket
inherits socket
class netlink_connector_socket
inherits socket
class netlink_netfilter_socket
inherits socket
class netlink_generic_socket
inherits socket
class netlink_scsitransport_socket
inherits socket
class netlink_rdma_socket
inherits socket
class netlink_crypto_socket
inherits socket
class x_pointer
inherits x_device
class x_keyboard
inherits x_device
class db_schema
inherits database
{
search
add_name
remove_name
}
class db_view
inherits database
{
expand
}
class db_sequence
inherits database
{
get_value
next_value
set_value
}
class infiniband_pkey
{
access
}
class infiniband_endport
{
manage_subnet
}
class db_language
inherits database
{
implement
execute
}
class service
{
start
stop
status
reload
enable
disable
}
#
# Define the access vector interpretation for controlling capabilities
# in user namespaces
#
class cap_userns
inherits cap
class cap2_userns
inherits cap2
#
# Define the access vector interpretation for the new socket classes
# enabled by the extended_socket_class policy capability.
#
#
# The next two classes were previously mapped to rawip_socket and therefore
# have the same definition as rawip_socket (until further permissions
# are defined).
#
class sctp_socket
inherits socket
{
node_bind
name_connect
association
}
class icmp_socket
inherits socket
{
node_bind
}
#
# The remaining network socket classes were previously
# mapped to the socket class and therefore have the
# same definition as socket.
#
class ax25_socket
inherits socket
class ipx_socket
inherits socket
class netrom_socket
inherits socket
class atmpvc_socket
inherits socket
class x25_socket
inherits socket
class rose_socket
inherits socket
class decnet_socket
inherits socket
class atmsvc_socket
inherits socket
class rds_socket
inherits socket
class irda_socket
inherits socket
class pppox_socket
inherits socket
class llc_socket
inherits socket
class can_socket
inherits socket
class tipc_socket
inherits socket
class bluetooth_socket
inherits socket
class iucv_socket
inherits socket
class rxrpc_socket
inherits socket
class isdn_socket
inherits socket
class phonet_socket
inherits socket
class ieee802154_socket
inherits socket
class caif_socket
inherits socket
class alg_socket
inherits socket
class nfc_socket
inherits socket
class vsock_socket
inherits socket
class kcm_socket
inherits socket
class qipcrtr_socket
inherits socket
class smc_socket
inherits socket
class bpf
{
map_create
map_read
map_write
prog_load
prog_run
}
class xdp_socket
inherits socket