The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/kern/capabilities.conf

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    1 ##
    2 ## Copyright (c) 2008-2010 Robert N. M. Watson
    3 ## All rights reserved.
    4 ##
    5 ## This software was developed at the University of Cambridge Computer
    6 ## Laboratory with support from a grant from Google, Inc.
    7 ##
    8 ## Redistribution and use in source and binary forms, with or without
    9 ## modification, are permitted provided that the following conditions
   10 ## are met:
   11 ## 1. Redistributions of source code must retain the above copyright
   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.
   16 ##
   17 ## THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   18 ## ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19 ## IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20 ## ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   21 ## FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22 ## DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23 ## OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   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
   27 ## SUCH DAMAGE.
   28 ##
   29 ## List of system calls enabled in capability mode, one name per line.
   30 ##
   31 ## Notes:
   32 ## - sys_exit(2), abort2(2) and close(2) are very important.
   33 ## - Sorted alphabetically, please keep it that way.
   34 ##
   35 ## $FreeBSD: releng/11.1/sys/kern/capabilities.conf 319819 2017-06-11 02:04:39Z allanjude $
   36 ##
   37 
   38 ##
   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).
   42 ##
   43 __acl_aclcheck_fd
   44 __acl_delete_fd
   45 __acl_get_fd
   46 __acl_set_fd
   47 __mac_get_fd
   48 #__mac_get_pid
   49 __mac_get_proc
   50 __mac_set_fd
   51 __mac_set_proc
   52 
   53 ##
   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.
   59 ##
   60 __sysctl
   61 
   62 ##
   63 ## Allow umtx operations as these are scoped by address space.
   64 ##
   65 ## XXRW: Need to check this very carefully.
   66 ##
   67 _umtx_op
   68 
   69 ##
   70 ## Allow process termination using abort2(2).
   71 ##
   72 abort2
   73 
   74 ##
   75 ## Allow accept(2) since it doesn't manipulate namespaces directly, rather
   76 ## relies on existing bindings on a socket, subject to capability rights.
   77 ##
   78 accept
   79 accept4
   80 
   81 ##
   82 ## Allow AIO operations by file descriptor, subject to capability rights.
   83 ##
   84 aio_cancel
   85 aio_error
   86 aio_fsync
   87 aio_read
   88 aio_return
   89 aio_suspend
   90 aio_waitcomplete
   91 aio_write
   92 
   93 ##
   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.
   98 ##
   99 #audit
  100 
  101 ##
  102 ## Allow bindat(2).
  103 ##
  104 bindat
  105 
  106 ##
  107 ## Allow capability mode and capability system calls.
  108 ##
  109 cap_enter
  110 cap_fcntls_get
  111 cap_fcntls_limit
  112 cap_getmode
  113 cap_ioctls_get
  114 cap_ioctls_limit
  115 __cap_rights_get
  116 cap_rights_limit
  117 
  118 ##
  119 ## Allow read-only clock operations.
  120 ##
  121 clock_getres
  122 clock_gettime
  123 
  124 ##
  125 ## Always allow file descriptor close(2).
  126 ##
  127 close
  128 closefrom
  129 
  130 ##
  131 ## Allow connectat(2).
  132 ##
  133 connectat
  134 
  135 ##
  136 ## cpuset(2) and related calls are limited to caller's own process/thread.
  137 ##
  138 #cpuset
  139 cpuset_getaffinity
  140 #cpuset_getid
  141 cpuset_setaffinity
  142 #cpuset_setid
  143 
  144 ##
  145 ## Always allow dup(2) and dup2(2) manipulation of the file descriptor table.
  146 ##
  147 dup
  148 dup2
  149 
  150 ##
  151 ## Allow extended attribute operations by file descriptor, subject to
  152 ## capability rights.
  153 ##
  154 extattr_delete_fd
  155 extattr_get_fd
  156 extattr_list_fd
  157 extattr_set_fd
  158 
  159 ##
  160 ## Allow changing file flags, mode, and owner by file descriptor, subject to
  161 ## capability rights.
  162 ##
  163 fchflags
  164 fchmod
  165 fchown
  166 
  167 ##
  168 ## For now, allow fcntl(2), subject to capability rights, but this probably
  169 ## needs additional scoping.
  170 ##
  171 fcntl
  172 
  173 ##
  174 ## Allow fexecve(2), subject to capability rights.  We perform some scoping,
  175 ## such as disallowing privilege escalation.
  176 ##
  177 fexecve
  178 
  179 ##
  180 ## Allow flock(2), subject to capability rights.
  181 ##
  182 flock
  183 
  184 ##
  185 ## Allow fork(2), even though it returns pids -- some applications seem to
  186 ## prefer this interface.
  187 ##
  188 fork
  189 
  190 ##
  191 ## Allow fpathconf(2), subject to capability rights.
  192 ##
  193 fpathconf
  194 
  195 ##
  196 ## Allow various file descriptor-based I/O operations, subject to capability
  197 ## rights.
  198 ##
  199 freebsd6_ftruncate
  200 freebsd6_lseek
  201 freebsd6_mmap
  202 freebsd6_pread
  203 freebsd6_pwrite
  204 
  205 ##
  206 ## Allow querying file and file system state with fstat(2) and fstatfs(2),
  207 ## subject to capability rights.
  208 ##
  209 fstat
  210 fstatfs
  211 
  212 ##
  213 ## Allow further file descriptor-based I/O operations, subject to capability
  214 ## rights.
  215 ##
  216 fsync
  217 ftruncate
  218 
  219 ##
  220 ## Allow futimens(2) and futimes(2), subject to capability rights.
  221 ##
  222 futimens
  223 futimes
  224 
  225 ##
  226 ## Allow querying process audit state, subject to normal access control.
  227 ##
  228 getaudit
  229 getaudit_addr
  230 getauid
  231 
  232 ##
  233 ## Allow thread context management with getcontext(2).
  234 ##
  235 getcontext
  236 
  237 ##
  238 ## Allow directory I/O on a file descriptor, subject to capability rights.
  239 ## Originally we had separate capabilities for directory-specific read
  240 ## operations, but on BSD we allow reading the raw directory data, so we just
  241 ## rely on CAP_READ now.
  242 ##
  243 getdents
  244 getdirentries
  245 
  246 ##
  247 ## Allow querying certain trivial global state.
  248 ##
  249 getdomainname
  250 getdtablesize
  251 
  252 ##
  253 ## Allow querying current process credential state.
  254 ##
  255 getegid
  256 geteuid
  257 
  258 ##
  259 ## Allow querying certain trivial global state.
  260 ##
  261 gethostid
  262 gethostname
  263 
  264 ##
  265 ## Allow querying per-process timer.
  266 ##
  267 getitimer
  268 
  269 ##
  270 ## Allow querying current process credential state.
  271 ##
  272 getgid
  273 getgroups
  274 getlogin
  275 
  276 ##
  277 ## Allow querying certain trivial global state.
  278 ##
  279 getpagesize
  280 getpeername
  281 
  282 ##
  283 ## Allow querying certain per-process scheduling, resource limit, and
  284 ## credential state.
  285 ##
  286 ## XXXRW: getpgid(2) needs scoping.  It's not clear if it's worth scoping
  287 ## getppid(2).  getpriority(2) needs scoping.  getrusage(2) needs scoping.
  288 ## getsid(2) needs scoping.
  289 ##
  290 getpgid
  291 getpgrp
  292 getpid
  293 getppid
  294 getpriority
  295 getresgid
  296 getresuid
  297 getrlimit
  298 getrusage
  299 getsid
  300 
  301 ##
  302 ## Allow querying socket state, subject to capability rights.
  303 ##
  304 ## XXXRW: getsockopt(2) may need more attention.
  305 ##
  306 getsockname
  307 getsockopt
  308 
  309 ##
  310 ## Allow querying the global clock.
  311 ##
  312 gettimeofday
  313 
  314 ##
  315 ## Allow querying current process credential state.
  316 ##
  317 getuid
  318 
  319 ##
  320 ## Allow ioctl(2), which hopefully will be limited by applications only to
  321 ## required commands with cap_ioctls_limit(2) syscall.
  322 ##
  323 ioctl
  324 
  325 ##
  326 ## Allow querying current process credential state.
  327 ##
  328 issetugid
  329 
  330 ##
  331 ## Allow kevent(2), as we will authorize based on capability rights on the
  332 ## target descriptor.
  333 ##
  334 kevent
  335 
  336 ##
  337 ## Allow kill(2), as we allow the process to send signals only to himself.
  338 ##
  339 kill
  340 
  341 ##
  342 ## Allow message queue operations on file descriptors, subject to capability
  343 ## rights.
  344 ##
  345 kmq_notify
  346 kmq_setattr
  347 kmq_timedreceive
  348 kmq_timedsend
  349 
  350 ##
  351 ## Allow kqueue(2), we will control use.
  352 ##
  353 kqueue
  354 
  355 ##
  356 ## Allow managing per-process timers.
  357 ##
  358 ktimer_create
  359 ktimer_delete
  360 ktimer_getoverrun
  361 ktimer_gettime
  362 ktimer_settime
  363 
  364 ##
  365 ## We can't allow ktrace(2) because it relies on a global namespace, but we
  366 ## might want to introduce an fktrace(2) of some sort.
  367 ##
  368 #ktrace
  369 
  370 ##
  371 ## Allow AIO operations by file descriptor, subject to capability rights.
  372 ##
  373 lio_listio
  374 
  375 ##
  376 ## Allow listen(2), subject to capability rights.
  377 ##
  378 ## XXXRW: One might argue this manipulates a global namespace.
  379 ##
  380 listen
  381 
  382 ##
  383 ## Allow I/O-related file descriptors, subject to capability rights.
  384 ##
  385 lseek
  386 
  387 ##
  388 ## Allow simple VM operations on the current process.
  389 ##
  390 madvise
  391 mincore
  392 minherit
  393 mlock
  394 mlockall
  395 
  396 ##
  397 ## Allow memory mapping a file descriptor, and updating protections, subject
  398 ## to capability rights.
  399 ##
  400 mmap
  401 mprotect
  402 
  403 ##
  404 ## Allow simple VM operations on the current process.
  405 ##
  406 msync
  407 munlock
  408 munlockall
  409 munmap
  410 
  411 ##
  412 ## Allow the current process to sleep.
  413 ##
  414 nanosleep
  415 
  416 ##
  417 ## Allow querying the global clock.
  418 ##
  419 ntp_gettime
  420 
  421 ##
  422 ## Allow AIO operations by file descriptor, subject to capability rights.
  423 ##
  424 oaio_read
  425 oaio_write
  426 
  427 ##
  428 ## Allow simple VM operations on the current process.
  429 ##
  430 obreak
  431 
  432 ##
  433 ## Allow AIO operations by file descriptor, subject to capability rights.
  434 ##
  435 olio_listio
  436 
  437 ##
  438 ## Operations relative to directory capabilities.
  439 ##
  440 chflagsat
  441 faccessat
  442 fchmodat
  443 fchownat
  444 fstatat
  445 futimesat
  446 linkat
  447 mkdirat
  448 mkfifoat
  449 mknodat
  450 openat
  451 readlinkat
  452 renameat
  453 symlinkat
  454 unlinkat
  455 utimensat
  456 
  457 ##
  458 ## Allow entry into open(2). This system call will fail, since access to the
  459 ## global file namespace has been disallowed, but allowing entry into the
  460 ## syscall means that an audit trail will be generated (which is also very
  461 ## useful for debugging).
  462 ##
  463 open
  464 
  465 ##
  466 ## Allow poll(2), which will be scoped by capability rights.
  467 ##
  468 ## XXXRW: Perhaps we don't need the OpenBSD version?
  469 ## XXXRW: We don't yet do that scoping.
  470 ##
  471 openbsd_poll
  472 
  473 ##
  474 ## Process descriptor-related system calls are allowed.
  475 ##
  476 pdfork
  477 pdgetpid
  478 pdkill
  479 #pdwait4        # not yet implemented
  480 
  481 ##
  482 ## Allow pipe(2).
  483 ##
  484 pipe
  485 pipe2
  486 
  487 ##
  488 ## Allow poll(2), which will be scoped by capability rights.
  489 ## XXXRW: We don't yet do that scoping.
  490 ##
  491 poll
  492 
  493 ##
  494 ## Allow I/O-related file descriptors, subject to capability rights.
  495 ##
  496 pread
  497 preadv
  498 
  499 ##
  500 ## Allow access to profiling state on the current process.
  501 ##
  502 profil
  503 
  504 ##
  505 ## Disallow ptrace(2) for now, but we do need debugging facilities in
  506 ## capability mode, so we will want to revisit this, possibly by scoping its
  507 ## operation.
  508 ##
  509 #ptrace
  510 
  511 ##
  512 ## Allow I/O-related file descriptors, subject to capability rights.
  513 ##
  514 pwrite
  515 pwritev
  516 read
  517 readv
  518 recv
  519 recvfrom
  520 recvmsg
  521 
  522 ##
  523 ## Allow real-time scheduling primitives to be used.
  524 ##
  525 ## XXXRW: These require scoping.
  526 ##
  527 rtprio
  528 rtprio_thread
  529 
  530 ##
  531 ## Allow simple VM operations on the current process.
  532 ##
  533 sbrk
  534 
  535 ##
  536 ## Allow querying trivial global scheduler state.
  537 ##
  538 sched_get_priority_max
  539 sched_get_priority_min
  540 
  541 ##
  542 ## Allow various thread/process scheduler operations.
  543 ##
  544 ## XXXRW: Some of these require further scoping.
  545 ##
  546 sched_getparam
  547 sched_getscheduler
  548 sched_rr_get_interval
  549 sched_setparam
  550 sched_setscheduler
  551 sched_yield
  552 
  553 ##
  554 ## Allow I/O-related file descriptors, subject to capability rights.
  555 ##
  556 sctp_generic_recvmsg
  557 sctp_generic_sendmsg
  558 sctp_generic_sendmsg_iov
  559 sctp_peeloff
  560 
  561 ##
  562 ## Allow pselect(2) and select(2), which will be scoped by capability rights.
  563 ##
  564 ## XXXRW: But is it?
  565 ##
  566 pselect
  567 select
  568 
  569 ##
  570 ## Allow I/O-related file descriptors, subject to capability rights.  Use of
  571 ## explicit addresses here is restricted by the system calls themselves.
  572 ##
  573 send
  574 sendfile
  575 sendmsg
  576 sendto
  577 
  578 ##
  579 ## Allow setting per-process audit state, which is controlled separately by
  580 ## privileges.
  581 ##
  582 setaudit
  583 setaudit_addr
  584 setauid
  585 
  586 ##
  587 ## Allow setting thread context.
  588 ##
  589 setcontext
  590 
  591 ##
  592 ## Allow setting current process credential state, which is controlled
  593 ## separately by privilege.
  594 ##
  595 setegid
  596 seteuid
  597 setgid
  598 
  599 ##
  600 ## Allow use of the process interval timer.
  601 ##
  602 setitimer
  603 
  604 ##
  605 ## Allow setpriority(2).
  606 ##
  607 ## XXXRW: Requires scoping.
  608 ##
  609 setpriority
  610 
  611 ##
  612 ## Allow setting current process credential state, which is controlled
  613 ## separately by privilege.
  614 ##
  615 setregid
  616 setresgid
  617 setresuid
  618 setreuid
  619 
  620 ##
  621 ## Allow setting process resource limits with setrlimit(2).
  622 ##
  623 setrlimit
  624 
  625 ##
  626 ## Allow creating a new session with setsid(2).
  627 ##
  628 setsid
  629 
  630 ##
  631 ## Allow setting socket options with setsockopt(2), subject to capability
  632 ## rights.
  633 ##
  634 ## XXXRW: Might require scoping.
  635 ##
  636 setsockopt
  637 
  638 ##
  639 ## Allow setting current process credential state, which is controlled
  640 ## separately by privilege.
  641 ##
  642 setuid
  643 
  644 ##
  645 ## shm_open(2) is scoped so as to allow only access to new anonymous objects.
  646 ##
  647 shm_open
  648 
  649 ##
  650 ## Allow I/O-related file descriptors, subject to capability rights.
  651 ##
  652 shutdown
  653 
  654 ##
  655 ## Allow signal control on current process.
  656 ##
  657 sigaction
  658 sigaltstack
  659 sigblock
  660 sigpending
  661 sigprocmask
  662 sigqueue
  663 sigreturn
  664 sigsetmask
  665 sigstack
  666 sigsuspend
  667 sigtimedwait
  668 sigvec
  669 sigwaitinfo
  670 sigwait
  671 
  672 ##
  673 ## Allow creating new socket pairs with socket(2) and socketpair(2).
  674 ##
  675 socket
  676 socketpair
  677 
  678 ##
  679 ## Allow simple VM operations on the current process.
  680 ##
  681 ## XXXRW: Kernel doesn't implement this, so drop?
  682 ##
  683 sstk
  684 
  685 ##
  686 ## Do allow sync(2) for now, but possibly shouldn't.
  687 ##
  688 sync
  689 
  690 ##
  691 ## Always allow process termination with sys_exit(2).
  692 ##
  693 sys_exit
  694 
  695 ##
  696 ## sysarch(2) does rather diverse things, but is required on at least i386
  697 ## in order to configure per-thread data.  As such, it's scoped on each
  698 ## architecture.
  699 ##
  700 sysarch
  701 
  702 ##
  703 ## Allow thread operations operating only on current process.
  704 ##
  705 thr_create
  706 thr_exit
  707 thr_kill
  708 
  709 ##
  710 ## Disallow thr_kill2(2), as it may operate beyond the current process.
  711 ##
  712 ## XXXRW: Requires scoping.
  713 ##
  714 #thr_kill2
  715 
  716 ##
  717 ## Allow thread operations operating only on current process.
  718 ##
  719 thr_new
  720 thr_self
  721 thr_set_name
  722 thr_suspend
  723 thr_wake
  724 
  725 ##
  726 ## Allow manipulation of the current process umask with umask(2).
  727 ##
  728 umask
  729 
  730 ##
  731 ## Allow submitting of process trace entries with utrace(2).
  732 ##
  733 utrace
  734 
  735 ##
  736 ## Allow generating UUIDs with uuidgen(2).
  737 ##
  738 uuidgen
  739 
  740 ##
  741 ## Allow I/O-related file descriptors, subject to capability rights.
  742 ##
  743 write
  744 writev
  745 
  746 ##
  747 ## Allow processes to yield(2).
  748 ##
  749 yield

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