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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29 ## List of system calls enabled in capability mode, one name per line.
31 ## System calls listed here operate either fully or partially in the absence
32 ## of global namespaces or ambient authority. In capability mode system calls
33 ## that operate only on global namespaces or require ambient authority have no
34 ## utility and thus are not permitted.
37 ## - sys_exit(2), abort2(2) and close(2) are very important.
38 ## - Sorted alphabetically, please keep it that way.
44 ## Allow ACL and MAC label operations by file descriptor, subject to
45 ## capability rights. Allow MAC label operations on the current process but
46 ## we will need to scope __mac_get_pid(2).
59 ## Allow sysctl(2) as we scope internal to the call; this is a global
60 ## namespace, but there are several critical sysctls required for almost
61 ## anything to run, such as hw.pagesize. For now that policy lives in the
62 ## kernel for performance and simplicity, but perhaps it could move to a
63 ## proxying daemon in userspace.
69 ## Allow umtx operations as these are scoped by address space.
71 ## XXRW: Need to check this very carefully.
76 ## Allow process termination using abort2(2).
81 ## Allow accept(2) since it doesn't manipulate namespaces directly, rather
82 ## relies on existing bindings on a socket, subject to capability rights.
88 ## Allow AIO operations by file descriptor, subject to capability rights.
100 ## audit(2) is a global operation, submitting to the global trail, but it is
101 ## controlled by privilege, and it might be useful to be able to submit
102 ## records from sandboxes. For now, disallow, but we may want to think about
103 ## providing some sort of proxy service for this.
113 ## Allow capability mode and capability system calls.
125 ## Allow read-only clock operations.
131 ## Always allow file descriptor close(2).
138 ## Allow connectat(2).
143 ## copy_file_range(2) reads from one descriptor and writes to the other.
148 ## cpuset(2) and related calls are limited to caller's own process/thread.
159 ## Always allow dup(2) and dup2(2) manipulation of the file descriptor table.
165 ## Allow extended attribute operations by file descriptor, subject to
166 ## capability rights.
174 ## Allow changing file flags, mode, and owner by file descriptor, subject to
175 ## capability rights.
182 ## For now, allow fcntl(2), subject to capability rights, but this probably
183 ## needs additional scoping.
188 ## Allow fexecve(2), subject to capability rights. We perform some scoping,
189 ## such as disallowing privilege escalation.
194 ## Allow flock(2), subject to capability rights.
199 ## Allow fork(2), even though it returns pids -- some applications seem to
200 ## prefer this interface.
205 ## Allow fpathconf(2), subject to capability rights.
210 ## Allow various file descriptor-based I/O operations, subject to capability
215 freebsd11_getdirentries
225 ## Allow querying file and file system state with fstat(2) and fstatfs(2),
226 ## subject to capability rights.
232 ## Allow further file descriptor-based I/O operations, subject to capability
240 ## Allow futimens(2) and futimes(2), subject to capability rights.
246 ## Allow querying process audit state, subject to normal access control.
253 ## Allow thread context management with getcontext(2).
258 ## Allow directory I/O on a file descriptor, subject to capability rights.
259 ## Originally we had separate capabilities for directory-specific read
260 ## operations, but on BSD we allow reading the raw directory data, so we just
261 ## rely on CAP_READ now.
267 ## Allow querying certain trivial global state.
272 ## Allow querying certain per-process resource limit state.
277 ## Allow querying current process credential state.
283 ## Allow querying certain trivial global state.
289 ## Allow querying per-process timer.
294 ## Allow querying current process credential state.
302 ## Allow querying certain trivial global state.
308 ## Allow querying certain per-process scheduling, resource limit, and
311 ## XXXRW: getpgid(2) needs scoping. It's not clear if it's worth scoping
312 ## getppid(2). getpriority(2) needs scoping. getrusage(2) needs scoping.
313 ## getsid(2) needs scoping.
332 ## Allow querying socket state, subject to capability rights.
334 ## XXXRW: getsockopt(2) may need more attention.
340 ## Allow querying the global clock.
345 ## Allow querying current process credential state.
350 ## Allow ioctl(2), which hopefully will be limited by applications only to
351 ## required commands with cap_ioctls_limit(2) syscall.
356 ## Allow querying current process credential state.
361 ## Allow kevent(2), as we will authorize based on capability rights on the
362 ## target descriptor.
367 ## Allow kill(2), as we allow the process to send signals only to himself.
372 ## Allow message queue operations on file descriptors, subject to capability
374 ## NOTE: Corresponding sysents are initialized in sys/kern/uipc_mqueue.c with
383 ## Allow kqueue(2), we will control use.
388 ## Allow managing per-process timers.
397 ## We can't allow ktrace(2) because it relies on a global namespace, but we
398 ## might want to introduce an fktrace(2) of some sort.
403 ## Allow AIO operations by file descriptor, subject to capability rights.
408 ## Allow listen(2), subject to capability rights.
410 ## XXXRW: One might argue this manipulates a global namespace.
415 ## Allow I/O-related file descriptors, subject to capability rights.
420 ## Allow simple VM operations on the current process.
429 ## Allow memory mapping a file descriptor, and updating protections, subject
430 ## to capability rights.
436 ## Allow simple VM operations on the current process.
444 ## Allow the current process to sleep.
449 ## Allow querying the global clock.
454 ## Allow AIO operations by file descriptor, subject to capability rights.
460 ## Allow simple VM operations on the current process.
465 ## Allow AIO operations by file descriptor, subject to capability rights.
470 ## Operations relative to directory capabilities.
491 ## Process descriptor-related system calls are allowed.
496 #pdwait4 # not yet implemented
505 ## Allow poll(2), which will be scoped by capability rights.
511 ## Allow I/O-related file descriptors, subject to capability rights.
518 ## Allow access to profiling state on the current process.
523 ## Disallow ptrace(2) for now, but we do need debugging facilities in
524 ## capability mode, so we will want to revisit this, possibly by scoping its
530 ## Allow I/O-related file descriptors, subject to capability rights.
541 ## Allow real-time scheduling primitives to be used.
543 ## XXXRW: These require scoping.
549 ## Allow simple VM operations on the current process.
554 ## Allow querying trivial global scheduler state.
556 sched_get_priority_max
557 sched_get_priority_min
560 ## Allow various thread/process scheduler operations.
562 ## XXXRW: Some of these require further scoping.
566 sched_rr_get_interval
572 ## Allow I/O-related file descriptors, subject to capability rights.
573 ## NOTE: Corresponding sysents are initialized in sys/netinet/sctp_syscalls.c
574 ## with SYF_CAPENABLED.
578 sctp_generic_sendmsg_iov
582 ## Allow pselect(2) and select(2), which will be scoped by capability rights.
590 ## Allow I/O-related file descriptors, subject to capability rights. Use of
591 ## explicit addresses here is restricted by the system calls themselves.
599 ## Allow setting per-process audit state, which is controlled separately by
607 ## Allow setting thread context.
612 ## Allow setting current process credential state, which is controlled
613 ## separately by privilege.
620 ## Allow use of the process interval timer.
625 ## Allow setpriority(2).
627 ## XXXRW: Requires scoping.
632 ## Allow setting current process credential state, which is controlled
633 ## separately by privilege.
641 ## Allow setting process resource limits with setrlimit(2).
646 ## Allow creating a new session with setsid(2).
651 ## Allow setting socket options with setsockopt(2), subject to capability
654 ## XXXRW: Might require scoping.
659 ## Allow setting current process credential state, which is controlled
660 ## separately by privilege.
665 ## shm_open(2) is scoped so as to allow only access to new anonymous objects.
671 ## Allow I/O-related file descriptors, subject to capability rights.
676 ## Allow signal control on current process.
695 ## Allow creating new socket pairs with socket(2) and socketpair(2).
701 ## Allow simple VM operations on the current process.
703 ## XXXRW: Kernel doesn't implement this, so drop?
708 ## Do allow sync(2) for now, but possibly shouldn't.
713 ## Always allow process termination with sys_exit(2).
718 ## sysarch(2) does rather diverse things, but is required on at least i386
719 ## in order to configure per-thread data. As such, it's scoped on each
725 ## Allow thread operations operating only on current process.
732 ## Disallow thr_kill2(2), as it may operate beyond the current process.
734 ## XXXRW: Requires scoping.
739 ## Allow thread operations operating only on current process.
748 ## Allow manipulation of the current process umask with umask(2).
753 ## Allow submitting of process trace entries with utrace(2).
758 ## Allow generating UUIDs with uuidgen(2).
763 ## Allow I/O-related file descriptors, subject to capability rights.
769 ## Allow processes to yield(2).