freebsd-dev/sys/kern/capabilities.conf

##
## Copyright (c) 2008-2010 Robert N. M. Watson
## All rights reserved.
##
## This software was developed at the University of Cambridge Computer
## Laboratory with support from a grant from Google, Inc.
##
## Redistribution and use in source and binary forms, with or without
## modification, are permitted provided that the following conditions
## are met:
## 1. Redistributions of source code must retain the above copyright
##    notice, this list of conditions and the following disclaimer.
## 2. Redistributions in binary form must reproduce the above copyright
##    notice, this list of conditions and the following disclaimer in the
##    documentation and/or other materials provided with the distribution.
##
## THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
## ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
## IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
## ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
## FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
## DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
## OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
## HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
## LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
## OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
## SUCH DAMAGE.
##
## List of system calls enabled in capability mode, one name per line.
##
## Notes:
## - sys_exit(2), abort2(2) and close(2) are very important.
## - Sorted alphabetically, please keep it that way.
##
## $FreeBSD$
##

##
## Allow ACL and MAC label operations by file descriptor, subject to
## capability rights.  Allow MAC label operations on the current process but
## we will need to scope __mac_get_pid(2).
##
__acl_aclcheck_fd
__acl_delete_fd
__acl_get_fd
__acl_set_fd
__mac_get_fd
#__mac_get_pid
__mac_get_proc
__mac_set_fd
__mac_set_proc

##
## Allow sysctl(2) as we scope internal to the call; this is a global
## namespace, but there are several critical sysctls required for almost
## anything to run, such as hw.pagesize.  For now that policy lives in the
## kernel for performance and simplicity, but perhaps it could move to a
## proxying daemon in userspace.
##
__sysctl

##
## Allow umtx operations as these are scoped by address space.
##
## XXRW: Need to check this very carefully.
##
_umtx_lock
_umtx_op
_umtx_unlock

##
## Allow process termination using abort2(2).
##
abort2

##
## Allow accept(2) since it doesn't manipulate namespaces directly, rather
## relies on existing bindings on a socket, subject to capability rights.
##
accept
accept4

##
## Allow AIO operations by file descriptor, subject to capability rights.
##
aio_cancel
aio_error
aio_fsync
aio_read
aio_return
aio_suspend
aio_waitcomplete
aio_write

##
## audit(2) is a global operation, submitting to the global trail, but it is
## controlled by privilege, and it might be useful to be able to submit
## records from sandboxes.  For now, disallow, but we may want to think about
## providing some sort of proxy service for this.
##
#audit

##
## Allow bindat(2).
##
bindat

##
## Allow capability mode and capability system calls.
##
cap_enter
cap_fcntls_get
cap_fcntls_limit
cap_getmode
cap_ioctls_get
cap_ioctls_limit
__cap_rights_get
cap_rights_limit

##
## Allow read-only clock operations.
##
clock_getres
clock_gettime

##
## Always allow file descriptor close(2).
##
close
closefrom

##
## Allow connectat(2).
##
connectat

##
## cpuset(2) and related calls require scoping by process, but should
## eventually be allowed, at least in the current process case.
##
#cpuset
#cpuset_getaffinity
#cpuset_getid
#cpuset_setaffinity
#cpuset_setid

##
## Always allow dup(2) and dup2(2) manipulation of the file descriptor table.
##
dup
dup2

##
## Allow extended attribute operations by file descriptor, subject to
## capability rights.
##
extattr_delete_fd
extattr_get_fd
extattr_list_fd
extattr_set_fd

##
## Allow changing file flags, mode, and owner by file descriptor, subject to
## capability rights.
##
fchflags
fchmod
fchown

##
## For now, allow fcntl(2), subject to capability rights, but this probably
## needs additional scoping.
##
fcntl

##
## Allow fexecve(2), subject to capability rights.  We perform some scoping,
## such as disallowing privilege escalation.
##
fexecve

##
## Allow flock(2), subject to capability rights.
##
flock

##
## Allow fork(2), even though it returns pids -- some applications seem to
## prefer this interface.
##
fork

##
## Allow fpathconf(2), subject to capability rights.
##
fpathconf

##
## Allow various file descriptor-based I/O operations, subject to capability
## rights.
##
freebsd6_ftruncate
freebsd6_lseek
freebsd6_mmap
freebsd6_pread
freebsd6_pwrite

##
## Allow querying file and file system state with fstat(2) and fstatfs(2),
## subject to capability rights.
##
fstat
fstatfs

##
## Allow further file descriptor-based I/O operations, subject to capability
## rights.
##
fsync
ftruncate

##
## Allow futimes(2), subject to capability rights.
##
futimes

##
## Allow querying process audit state, subject to normal access control.
##
getaudit
getaudit_addr
getauid

##
## Allow thread context management with getcontext(2).
##
getcontext

##
## Allow directory I/O on a file descriptor, subject to capability rights.
## Originally we had separate capabilities for directory-specific read
## operations, but on BSD we allow reading the raw directory data, so we just
## rely on CAP_READ now.
##
getdents
getdirentries

##
## Allow querying certain trivial global state.
##
getdomainname

##
## Allow querying current process credential state.
##
getegid
geteuid

##
## Allow querying certain trivial global state.
##
gethostid
gethostname

##
## Allow querying per-process timer.
##
getitimer

##
## Allow querying current process credential state.
##
getgid
getgroups
getlogin

##
## Allow querying certain trivial global state.
##
getpagesize
getpeername

##
## Allow querying certain per-process scheduling, resource limit, and
## credential state.
##
## XXXRW: getpgid(2) needs scoping.  It's not clear if it's worth scoping
## getppid(2).  getpriority(2) needs scoping.  getrusage(2) needs scoping.
## getsid(2) needs scoping.
##
getpgid
getpgrp
getpid
getppid
getpriority
getresgid
getresuid
getrlimit
getrusage
getsid

##
## Allow querying socket state, subject to capability rights.
##
## XXXRW: getsockopt(2) may need more attention.
##
getsockname
getsockopt

##
## Allow querying the global clock.
##
gettimeofday

##
## Allow querying current process credential state.
##
getuid

##
## Allow ioctl(2), which hopefully will be limited by applications only to
## required commands with cap_ioctls_limit(2) syscall.
##
ioctl

##
## Allow querying current process credential state.
##
issetugid

##
## Allow kevent(2), as we will authorize based on capability rights on the
## target descriptor.
##
kevent

##
## Allow kill(2), as we allow the process to send signals only to himself.
##
kill

##
## Allow message queue operations on file descriptors, subject to capability
## rights.
##
kmq_notify
kmq_setattr
kmq_timedreceive
kmq_timedsend

##
## Allow kqueue(2), we will control use.
##
kqueue

##
## Allow managing per-process timers.
##
ktimer_create
ktimer_delete
ktimer_getoverrun
ktimer_gettime
ktimer_settime

##
## We can't allow ktrace(2) because it relies on a global namespace, but we
## might want to introduce an fktrace(2) of some sort.
##
#ktrace

##
## Allow AIO operations by file descriptor, subject to capability rights.
##
lio_listio

##
## Allow listen(2), subject to capability rights.
##
## XXXRW: One might argue this manipulates a global namespace.
##
listen

##
## Allow I/O-related file descriptors, subject to capability rights.
##
lseek

##
## Allow simple VM operations on the current process.
##
madvise
mincore
minherit
mlock
mlockall

##
## Allow memory mapping a file descriptor, and updating protections, subject
## to capability rights.
##
mmap
mprotect

##
## Allow simple VM operations on the current process.
##
msync
munlock
munlockall
munmap

##
## Allow the current process to sleep.
##
nanosleep

##
## Allow querying the global clock.
##
ntp_gettime

##
## Allow AIO operations by file descriptor, subject to capability rights.
##
oaio_read
oaio_write

##
## Allow simple VM operations on the current process.
##
obreak

##
## Allow AIO operations by file descriptor, subject to capability rights.
##
olio_listio

##
## Operations relative to directory capabilities.
##
chflagsat
faccessat
fchmodat
fchownat
fstatat
futimesat
linkat
mkdirat
mkfifoat
mknodat
openat
readlinkat
renameat
symlinkat
unlinkat

##
## Allow entry into open(2). This system call will fail, since access to the
## global file namespace has been disallowed, but allowing entry into the
## syscall means that an audit trail will be generated (which is also very
## useful for debugging).
##
open

##
## Allow poll(2), which will be scoped by capability rights.
##
## XXXRW: Perhaps we don't need the OpenBSD version?
## XXXRW: We don't yet do that scoping.
##
openbsd_poll

##
## Process descriptor-related system calls are allowed.
##
pdfork
pdgetpid
pdkill
#pdwait4	# not yet implemented

##
## Allow pipe(2).
##
pipe
pipe2

##
## Allow poll(2), which will be scoped by capability rights.
## XXXRW: We don't yet do that scoping.
##
poll

##
## Allow I/O-related file descriptors, subject to capability rights.
##
pread
preadv

##
## Allow access to profiling state on the current process.
##
profil

##
## Disallow ptrace(2) for now, but we do need debugging facilities in
## capability mode, so we will want to revisit this, possibly by scoping its
## operation.
##
#ptrace

##
## Allow I/O-related file descriptors, subject to capability rights.
##
pwrite
pwritev
read
readv
recv
recvfrom
recvmsg

##
## Allow real-time scheduling primitives to be used.
##
## XXXRW: These require scoping.
##
rtprio
rtprio_thread

##
## Allow simple VM operations on the current process.
##
sbrk

##
## Allow querying trivial global scheduler state.
##
sched_get_priority_max
sched_get_priority_min

##
## Allow various thread/process scheduler operations.
##
## XXXRW: Some of these require further scoping.
##
sched_getparam
sched_getscheduler
sched_rr_get_interval
sched_setparam
sched_setscheduler
sched_yield

##
## Allow I/O-related file descriptors, subject to capability rights.
##
sctp_generic_recvmsg
sctp_generic_sendmsg
sctp_generic_sendmsg_iov
sctp_peeloff

##
## Allow pselect(2) and select(2), which will be scoped by capability rights.
##
## XXXRW: But is it?
##
pselect
select

##
## Allow I/O-related file descriptors, subject to capability rights.  Use of
## explicit addresses here is restricted by the system calls themselves.
##
send
sendfile
sendmsg
sendto

##
## Allow setting per-process audit state, which is controlled separately by
## privileges.
##
setaudit
setaudit_addr
setauid

##
## Allow setting thread context.
##
setcontext

##
## Allow setting current process credential state, which is controlled
## separately by privilege.
##
setegid
seteuid
setgid

##
## Allow use of the process interval timer.
##
setitimer

##
## Allow setpriority(2).
##
## XXXRW: Requires scoping.
##
setpriority

##
## Allow setting current process credential state, which is controlled
## separately by privilege.
##
setregid
setresgid
setresuid
setreuid

##
## Allow setting process resource limits with setrlimit(2).
##
setrlimit

##
## Allow creating a new session with setsid(2).
##
setsid

##
## Allow setting socket options with setsockopt(2), subject to capability
## rights.
##
## XXXRW: Might require scoping.
##
setsockopt

##
## Allow setting current process credential state, which is controlled
## separately by privilege.
##
setuid

##
## shm_open(2) is scoped so as to allow only access to new anonymous objects.
##
shm_open

##
## Allow I/O-related file descriptors, subject to capability rights.
##
shutdown

##
## Allow signal control on current process.
##
sigaction
sigaltstack
sigblock
sigpending
sigprocmask
sigqueue
sigreturn
sigsetmask
sigstack
sigsuspend
sigtimedwait
sigvec
sigwaitinfo
sigwait

##
## Allow creating new socket pairs with socket(2) and socketpair(2).
##
socket
socketpair

##
## Allow simple VM operations on the current process.
##
## XXXRW: Kernel doesn't implement this, so drop?
##
sstk

##
## Do allow sync(2) for now, but possibly shouldn't.
##
sync

##
## Always allow process termination with sys_exit(2).
##
sys_exit

##
## sysarch(2) does rather diverse things, but is required on at least i386
## in order to configure per-thread data.  As such, it's scoped on each
## architecture.
##
sysarch

##
## Allow thread operations operating only on current process.
##
thr_create
thr_exit
thr_kill

##
## Disallow thr_kill2(2), as it may operate beyond the current process.
##
## XXXRW: Requires scoping.
##
#thr_kill2

##
## Allow thread operations operating only on current process.
##
thr_new
thr_self
thr_set_name
thr_suspend
thr_wake

##
## Allow manipulation of the current process umask with umask(2).
##
umask

##
## Allow submitting of process trace entries with utrace(2).
##
utrace

##
## Allow generating UUIDs with uuidgen(2).
##
uuidgen

##
## Allow I/O-related file descriptors, subject to capability rights.
##
write
writev

##
## Allow processes to yield(2).
##
yield