2 ## Copyright (c) 2008-2010 Robert N. M. Watson
3 ## All rights reserved.
5 ## This software was developed at the University of Cambridge Computer
6 ## Laboratory with support from a grant from Google, Inc.
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9 ## modification, are permitted provided that the following conditions
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12 ## notice, this list of conditions and the following disclaimer.
13 ## 2. Redistributions in binary form must reproduce the above copyright
14 ## notice, this list of conditions and the following disclaimer in the
15 ## documentation and/or other materials provided with the distribution.
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24 ## HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 ## LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 ## OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 ## List of system calls enabled in capability mode, one name per line.
32 ## - sys_exit(2), abort2(2) and close(2) are very important.
33 ## - Sorted alphabetically, please keep it that way.
39 ## Allow ACL and MAC label operations by file descriptor, subject to
40 ## capability rights. Allow MAC label operations on the current process but
41 ## we will need to scope __mac_get_pid(2).
54 ## Allow sysctl(2) as we scope internal to the call; this is a global
55 ## namespace, but there are several critical sysctls required for almost
56 ## anything to run, such as hw.pagesize. For now that policy lives in the
57 ## kernel for performance and simplicity, but perhaps it could move to a
58 ## proxying daemon in userspace.
63 ## Allow umtx operations as these are scoped by address space.
65 ## XXRW: Need to check this very carefully.
70 ## Allow process termination using abort2(2).
75 ## Allow accept(2) since it doesn't manipulate namespaces directly, rather
76 ## relies on existing bindings on a socket, subject to capability rights.
82 ## Allow AIO operations by file descriptor, subject to capability rights.
94 ## audit(2) is a global operation, submitting to the global trail, but it is
95 ## controlled by privilege, and it might be useful to be able to submit
96 ## records from sandboxes. For now, disallow, but we may want to think about
97 ## providing some sort of proxy service for this.
107 ## Allow capability mode and capability system calls.
119 ## Allow read-only clock operations.
125 ## Always allow file descriptor close(2).
131 ## Allow connectat(2).
136 ## cpuset(2) and related calls are limited to caller's own process/thread.
145 ## Always allow dup(2) and dup2(2) manipulation of the file descriptor table.
151 ## Allow extended attribute operations by file descriptor, subject to
152 ## capability rights.
160 ## Allow changing file flags, mode, and owner by file descriptor, subject to
161 ## capability rights.
168 ## For now, allow fcntl(2), subject to capability rights, but this probably
169 ## needs additional scoping.
174 ## Allow fexecve(2), subject to capability rights. We perform some scoping,
175 ## such as disallowing privilege escalation.
180 ## Allow flock(2), subject to capability rights.
185 ## Allow fork(2), even though it returns pids -- some applications seem to
186 ## prefer this interface.
191 ## Allow fpathconf(2), subject to capability rights.
196 ## Allow various file descriptor-based I/O operations, subject to capability
201 freebsd11_getdirentries
211 ## Allow querying file and file system state with fstat(2) and fstatfs(2),
212 ## subject to capability rights.
218 ## Allow further file descriptor-based I/O operations, subject to capability
225 ## Allow futimens(2) and futimes(2), subject to capability rights.
231 ## Allow querying process audit state, subject to normal access control.
238 ## Allow thread context management with getcontext(2).
243 ## Allow directory I/O on a file descriptor, subject to capability rights.
244 ## Originally we had separate capabilities for directory-specific read
245 ## operations, but on BSD we allow reading the raw directory data, so we just
246 ## rely on CAP_READ now.
252 ## Allow querying certain trivial global state.
257 ## Allow querying certain per-process resource limit state.
262 ## Allow querying current process credential state.
268 ## Allow querying certain trivial global state.
274 ## Allow querying per-process timer.
279 ## Allow querying current process credential state.
286 ## Allow querying certain trivial global state.
292 ## Allow querying certain per-process scheduling, resource limit, and
295 ## XXXRW: getpgid(2) needs scoping. It's not clear if it's worth scoping
296 ## getppid(2). getpriority(2) needs scoping. getrusage(2) needs scoping.
297 ## getsid(2) needs scoping.
311 ## Allow querying socket state, subject to capability rights.
313 ## XXXRW: getsockopt(2) may need more attention.
319 ## Allow querying the global clock.
324 ## Allow querying current process credential state.
329 ## Allow ioctl(2), which hopefully will be limited by applications only to
330 ## required commands with cap_ioctls_limit(2) syscall.
335 ## Allow querying current process credential state.
340 ## Allow kevent(2), as we will authorize based on capability rights on the
341 ## target descriptor.
346 ## Allow kill(2), as we allow the process to send signals only to himself.
351 ## Allow message queue operations on file descriptors, subject to capability
353 ## NOTE: Corresponding sysents are initialized in sys/kern/uipc_mqueue.c with
362 ## Allow kqueue(2), we will control use.
367 ## Allow managing per-process timers.
376 ## We can't allow ktrace(2) because it relies on a global namespace, but we
377 ## might want to introduce an fktrace(2) of some sort.
382 ## Allow AIO operations by file descriptor, subject to capability rights.
387 ## Allow listen(2), subject to capability rights.
389 ## XXXRW: One might argue this manipulates a global namespace.
394 ## Allow I/O-related file descriptors, subject to capability rights.
399 ## Allow simple VM operations on the current process.
408 ## Allow memory mapping a file descriptor, and updating protections, subject
409 ## to capability rights.
415 ## Allow simple VM operations on the current process.
423 ## Allow the current process to sleep.
428 ## Allow querying the global clock.
433 ## Allow AIO operations by file descriptor, subject to capability rights.
439 ## Allow simple VM operations on the current process.
444 ## Allow AIO operations by file descriptor, subject to capability rights.
449 ## Operations relative to directory capabilities.
469 ## Process descriptor-related system calls are allowed.
474 #pdwait4 # not yet implemented
483 ## Allow poll(2), which will be scoped by capability rights.
484 ## XXXRW: We don't yet do that scoping.
489 ## Allow I/O-related file descriptors, subject to capability rights.
496 ## Allow access to profiling state on the current process.
501 ## Disallow ptrace(2) for now, but we do need debugging facilities in
502 ## capability mode, so we will want to revisit this, possibly by scoping its
508 ## Allow I/O-related file descriptors, subject to capability rights.
519 ## Allow real-time scheduling primitives to be used.
521 ## XXXRW: These require scoping.
527 ## Allow simple VM operations on the current process.
532 ## Allow querying trivial global scheduler state.
534 sched_get_priority_max
535 sched_get_priority_min
538 ## Allow various thread/process scheduler operations.
540 ## XXXRW: Some of these require further scoping.
544 sched_rr_get_interval
550 ## Allow I/O-related file descriptors, subject to capability rights.
551 ## NOTE: Corresponding sysents are initialized in sys/netinet/sctp_syscalls.c
552 ## with SYF_CAPENABLED.
556 sctp_generic_sendmsg_iov
560 ## Allow pselect(2) and select(2), which will be scoped by capability rights.
568 ## Allow I/O-related file descriptors, subject to capability rights. Use of
569 ## explicit addresses here is restricted by the system calls themselves.
577 ## Allow setting per-process audit state, which is controlled separately by
585 ## Allow setting thread context.
590 ## Allow setting current process credential state, which is controlled
591 ## separately by privilege.
598 ## Allow use of the process interval timer.
603 ## Allow setpriority(2).
605 ## XXXRW: Requires scoping.
610 ## Allow setting current process credential state, which is controlled
611 ## separately by privilege.
619 ## Allow setting process resource limits with setrlimit(2).
624 ## Allow creating a new session with setsid(2).
629 ## Allow setting socket options with setsockopt(2), subject to capability
632 ## XXXRW: Might require scoping.
637 ## Allow setting current process credential state, which is controlled
638 ## separately by privilege.
643 ## shm_open(2) is scoped so as to allow only access to new anonymous objects.
648 ## Allow I/O-related file descriptors, subject to capability rights.
653 ## Allow signal control on current process.
671 ## Allow creating new socket pairs with socket(2) and socketpair(2).
677 ## Allow simple VM operations on the current process.
679 ## XXXRW: Kernel doesn't implement this, so drop?
684 ## Do allow sync(2) for now, but possibly shouldn't.
689 ## Always allow process termination with sys_exit(2).
694 ## sysarch(2) does rather diverse things, but is required on at least i386
695 ## in order to configure per-thread data. As such, it's scoped on each
701 ## Allow thread operations operating only on current process.
708 ## Disallow thr_kill2(2), as it may operate beyond the current process.
710 ## XXXRW: Requires scoping.
715 ## Allow thread operations operating only on current process.
724 ## Allow manipulation of the current process umask with umask(2).
729 ## Allow submitting of process trace entries with utrace(2).
734 ## Allow generating UUIDs with uuidgen(2).
739 ## Allow I/O-related file descriptors, subject to capability rights.
745 ## Allow processes to yield(2).