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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13 ## 2. Redistributions in binary form must reproduce the above copyright
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15 ## documentation and/or other materials provided with the distribution.
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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.
72 ## Allow process termination using abort2(2).
77 ## Allow accept(2) since it doesn't manipulate namespaces directly, rather
78 ## relies on existing bindings on a socket, subject to capability rights.
84 ## Allow AIO operations by file descriptor, subject to capability rights.
96 ## audit(2) is a global operation, submitting to the global trail, but it is
97 ## controlled by privilege, and it might be useful to be able to submit
98 ## records from sandboxes. For now, disallow, but we may want to think about
99 ## providing some sort of proxy service for this.
109 ## Allow capability mode and capability system calls.
121 ## Allow read-only clock operations.
127 ## Always allow file descriptor close(2).
133 ## Allow connectat(2).
138 ## cpuset(2) and related calls require scoping by process, but should
139 ## eventually be allowed, at least in the current process case.
148 ## Always allow dup(2) and dup2(2) manipulation of the file descriptor table.
154 ## Allow extended attribute operations by file descriptor, subject to
155 ## capability rights.
163 ## Allow changing file flags, mode, and owner by file descriptor, subject to
164 ## capability rights.
171 ## For now, allow fcntl(2), subject to capability rights, but this probably
172 ## needs additional scoping.
177 ## Allow fexecve(2), subject to capability rights. We perform some scoping,
178 ## such as disallowing privilege escalation.
183 ## Allow flock(2), subject to capability rights.
188 ## Allow fork(2), even though it returns pids -- some applications seem to
189 ## prefer this interface.
194 ## Allow fpathconf(2), subject to capability rights.
199 ## Allow various file descriptor-based I/O operations, subject to capability
209 ## Allow querying file and file system state with fstat(2) and fstatfs(2),
210 ## subject to capability rights.
216 ## Allow further file descriptor-based I/O operations, subject to capability
223 ## Allow futimes(2), subject to capability rights.
228 ## Allow querying process audit state, subject to normal access control.
235 ## Allow thread context management with getcontext(2).
240 ## Allow directory I/O on a file descriptor, subject to capability rights.
241 ## Originally we had separate capabilities for directory-specific read
242 ## operations, but on BSD we allow reading the raw directory data, so we just
243 ## rely on CAP_READ now.
249 ## Allow querying certain trivial global state.
254 ## Allow querying current process credential state.
260 ## Allow querying certain trivial global state.
266 ## Allow querying per-process timer.
271 ## Allow querying current process credential state.
278 ## Allow querying certain trivial global state.
284 ## Allow querying certain per-process scheduling, resource limit, and
287 ## XXXRW: getpgid(2) needs scoping. It's not clear if it's worth scoping
288 ## getppid(2). getpriority(2) needs scoping. getrusage(2) needs scoping.
289 ## getsid(2) needs scoping.
303 ## Allow querying socket state, subject to capability rights.
305 ## XXXRW: getsockopt(2) may need more attention.
311 ## Allow querying the global clock.
316 ## Allow querying current process credential state.
321 ## Allow ioctl(2), which hopefully will be limited by applications only to
322 ## required commands with cap_ioctls_limit(2) syscall.
327 ## Allow querying current process credential state.
332 ## Allow kevent(2), as we will authorize based on capability rights on the
333 ## target descriptor.
338 ## Allow kill(2), as we allow the process to send signals only to himself.
343 ## Allow message queue operations on file descriptors, subject to capability
352 ## Allow kqueue(2), we will control use.
357 ## Allow managing per-process timers.
366 ## We can't allow ktrace(2) because it relies on a global namespace, but we
367 ## might want to introduce an fktrace(2) of some sort.
372 ## Allow AIO operations by file descriptor, subject to capability rights.
377 ## Allow listen(2), subject to capability rights.
379 ## XXXRW: One might argue this manipulates a global namespace.
384 ## Allow I/O-related file descriptors, subject to capability rights.
389 ## Allow MAC label operations by file descriptor, subject to capability
396 ## Allow simple VM operations on the current process.
405 ## Allow memory mapping a file descriptor, and updating protections, subject
406 ## to capability rights.
412 ## Allow simple VM operations on the current process.
420 ## Allow the current process to sleep.
425 ## Allow querying the global clock.
430 ## Allow AIO operations by file descriptor, subject to capability rights.
436 ## Allow simple VM operations on the current process.
441 ## Allow AIO operations by file descriptor, subject to capability rights.
446 ## Operations relative to directory capabilities.
465 ## Allow entry into open(2). This system call will fail, since access to the
466 ## global file namespace has been disallowed, but allowing entry into the
467 ## syscall means that an audit trail will be generated (which is also very
468 ## useful for debugging).
473 ## Allow poll(2), which will be scoped by capability rights.
475 ## XXXRW: Perhaps we don't need the OpenBSD version?
476 ## XXXRW: We don't yet do that scoping.
481 ## Process descriptor-related system calls are allowed.
486 #pdwait4 # not yet implemented
495 ## Allow poll(2), which will be scoped by capability rights.
496 ## XXXRW: We don't yet do that scoping.
501 ## Allow I/O-related file descriptors, subject to capability rights.
507 ## Allow access to profiling state on the current process.
512 ## Disallow ptrace(2) for now, but we do need debugging facilities in
513 ## capability mode, so we will want to revisit this, possibly by scoping its
519 ## Allow I/O-related file descriptors, subject to capability rights.
530 ## Allow real-time scheduling primitives to be used.
532 ## XXXRW: These require scoping.
538 ## Allow simple VM operations on the current process.
543 ## Allow querying trivial global scheduler state.
545 sched_get_priority_max
546 sched_get_priority_min
549 ## Allow various thread/process scheduler operations.
551 ## XXXRW: Some of these require further scoping.
561 ## Allow I/O-related file descriptors, subject to capability rights.
565 sctp_generic_sendmsg_iov
569 ## Allow select(2), which will be scoped by capability rights.
576 ## Allow I/O-related file descriptors, subject to capability rights. Use of
577 ## explicit addresses here is restricted by the system calls themselves.
585 ## Allow setting per-process audit state, which is controlled separately by
593 ## Allow setting thread context.
598 ## Allow setting current process credential state, which is controlled
599 ## separately by privilege.
606 ## Allow use of the process interval timer.
611 ## Allow setpriority(2).
613 ## XXXRW: Requires scoping.
618 ## Allow setting current process credential state, which is controlled
619 ## separately by privilege.
627 ## Allow setting process resource limits with setrlimit(2).
632 ## Allow creating a new session with setsid(2).
637 ## Allow setting socket options with setsockopt(2), subject to capability
640 ## XXXRW: Might require scoping.
645 ## Allow setting current process credential state, which is controlled
646 ## separately by privilege.
651 ## shm_open(2) is scoped so as to allow only access to new anonymous objects.
656 ## Allow I/O-related file descriptors, subject to capability rights.
661 ## Allow signal control on current process.
678 ## Allow creating new socket pairs with socket(2) and socketpair(2).
684 ## Allow simple VM operations on the current process.
686 ## XXXRW: Kernel doesn't implement this, so drop?
691 ## Do allow sync(2) for now, but possibly shouldn't.
696 ## Always allow process termination with sys_exit(2).
701 ## sysarch(2) does rather diverse things, but is required on at least i386
702 ## in order to configure per-thread data. As such, it's scoped on each
708 ## Allow thread operations operating only on current process.
715 ## Disallow thr_kill2(2), as it may operate beyond the current process.
717 ## XXXRW: Requires scoping.
722 ## Allow thread operations operating only on current process.
731 ## Allow manipulation of the current process umask with umask(2).
736 ## Allow submitting of process trace entries with utrace(2).
741 ## Allow generating UUIDs with uuidgen(2).
746 ## Allow I/O-related file descriptors, subject to capability rights.
752 ## Allow processes to yield(2).