capabilities.conf revision 247667
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: head/sys/kern/capabilities.conf 247667 2013-03-02 21:11:30Z pjd $ 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_lock 68_umtx_op 69_umtx_unlock 70 71## 72## Allow process termination using abort2(2). 73## 74abort2 75 76## 77## Allow accept(2) since it doesn't manipulate namespaces directly, rather 78## relies on existing bindings on a socket, subject to capability rights. 79## 80accept 81 82## 83## Allow AIO operations by file descriptor, subject to capability rights. 84## 85aio_cancel 86aio_error 87aio_fsync 88aio_read 89aio_return 90aio_suspend 91aio_waitcomplete 92aio_write 93 94## 95## audit(2) is a global operation, submitting to the global trail, but it is 96## controlled by privilege, and it might be useful to be able to submit 97## records from sandboxes. For now, disallow, but we may want to think about 98## providing some sort of proxy service for this. 99## 100#audit 101 102## 103## Allow bindat(2). 104## 105bindat 106 107## 108## Allow capability mode and capability system calls. 109## 110cap_enter 111cap_fcntls_get 112cap_fcntls_limit 113cap_getmode 114cap_ioctls_get 115cap_ioctls_limit 116cap_new 117cap_rights_get 118cap_rights_limit 119 120## 121## Allow read-only clock operations. 122## 123clock_gettime 124clock_getres 125 126## 127## Always allow file descriptor close(2). 128## 129close 130closefrom 131 132## 133## Allow connectat(2). 134## 135connectat 136 137## 138## cpuset(2) and related calls require scoping by process, but should 139## eventually be allowed, at least in the current process case. 140## 141#cpuset 142#cpuset_getaffinity 143#cpuset_getid 144#cpuset_setaffinity 145#cpuset_setid 146 147## 148## Always allow dup(2) and dup2(2) manipulation of the file descriptor table. 149## 150dup 151dup2 152 153## 154## Allow extended attribute operations by file descriptor, subject to 155## capability rights. 156## 157extattr_delete_fd 158extattr_get_fd 159extattr_list_fd 160extattr_set_fd 161 162## 163## Allow changing file flags, mode, and owner by file descriptor, subject to 164## capability rights. 165## 166fchflags 167fchmod 168fchown 169 170## 171## For now, allow fcntl(2), subject to capability rights, but this probably 172## needs additional scoping. 173## 174fcntl 175 176## 177## Allow fexecve(2), subject to capability rights. We perform some scoping, 178## such as disallowing privilege escalation. 179## 180fexecve 181 182## 183## Allow flock(2), subject to capability rights. 184## 185flock 186 187## 188## Allow fork(2), even though it returns pids -- some applications seem to 189## prefer this interface. 190## 191fork 192 193## 194## Allow fpathconf(2), subject to capability rights. 195## 196fpathconf 197 198## 199## Allow various file descriptor-based I/O operations, subject to capability 200## rights. 201## 202freebsd6_ftruncate 203freebsd6_lseek 204freebsd6_mmap 205freebsd6_pread 206freebsd6_pwrite 207 208## 209## Allow querying file and file system state with fstat(2) and fstatfs(2), 210## subject to capability rights. 211## 212fstat 213fstatfs 214 215## 216## Allow further file descriptor-based I/O operations, subject to capability 217## rights. 218## 219fsync 220ftruncate 221 222## 223## Allow futimes(2), subject to capability rights. 224## 225futimes 226 227## 228## Allow querying process audit state, subject to normal access control. 229## 230getaudit 231getaudit_addr 232getauid 233 234## 235## Allow thread context management with getcontext(2). 236## 237getcontext 238 239## 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. 244## 245getdents 246getdirentries 247 248## 249## Allow querying certain trivial global state. 250## 251getdomainname 252 253## 254## Allow querying current process credential state. 255## 256getegid 257geteuid 258 259## 260## Allow querying certain trivial global state. 261## 262gethostid 263gethostname 264 265## 266## Allow querying per-process timer. 267## 268getitimer 269 270## 271## Allow querying current process credential state. 272## 273getgid 274getgroups 275getlogin 276 277## 278## Allow querying certain trivial global state. 279## 280getpagesize 281getpeername 282 283## 284## Allow querying certain per-process scheduling, resource limit, and 285## credential state. 286## 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. 290## 291getpgid 292getpgrp 293getpid 294getppid 295getpriority 296getresgid 297getresuid 298getrlimit 299getrusage 300getsid 301 302## 303## Allow querying socket state, subject to capability rights. 304## 305## XXXRW: getsockopt(2) may need more attention. 306## 307getsockname 308getsockopt 309 310## 311## Allow querying the global clock. 312## 313gettimeofday 314 315## 316## Allow querying current process credential state. 317## 318getuid 319 320## 321## Allow ioctl(2), which hopefully will be limited by applications only to 322## required commands with cap_ioctls_limit(2) syscall. 323## 324ioctl 325 326## 327## Allow querying current process credential state. 328## 329issetugid 330 331## 332## Allow kevent(2), as we will authorize based on capability rights on the 333## target descriptor. 334## 335kevent 336 337## 338## Allow kill(2), as we allow the process to send signals only to himself. 339## 340kill 341 342## 343## Allow message queue operations on file descriptors, subject to capability 344## rights. 345## 346kmq_notify 347kmq_setattr 348kmq_timedreceive 349kmq_timedsend 350 351## 352## Allow kqueue(2), we will control use. 353## 354kqueue 355 356## 357## Allow managing per-process timers. 358## 359ktimer_create 360ktimer_delete 361ktimer_getoverrun 362ktimer_gettime 363ktimer_settime 364 365## 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. 368## 369#ktrace 370 371## 372## Allow AIO operations by file descriptor, subject to capability rights. 373## 374lio_listio 375 376## 377## Allow listen(2), subject to capability rights. 378## 379## XXXRW: One might argue this manipulates a global namespace. 380## 381listen 382 383## 384## Allow I/O-related file descriptors, subject to capability rights. 385## 386lseek 387 388## 389## Allow MAC label operations by file descriptor, subject to capability 390## rights. 391## 392mac_get_fd 393mac_set_fd 394 395## 396## Allow simple VM operations on the current process. 397## 398madvise 399mincore 400minherit 401mlock 402mlockall 403 404## 405## Allow memory mapping a file descriptor, and updating protections, subject 406## to capability rights. 407## 408mmap 409mprotect 410 411## 412## Allow simple VM operations on the current process. 413## 414msync 415munlock 416munlockall 417munmap 418 419## 420## Allow the current process to sleep. 421## 422nanosleep 423 424## 425## Allow querying the global clock. 426## 427ntp_gettime 428 429## 430## Allow AIO operations by file descriptor, subject to capability rights. 431## 432oaio_read 433oaio_write 434 435## 436## Allow simple VM operations on the current process. 437## 438obreak 439 440## 441## Allow AIO operations by file descriptor, subject to capability rights. 442## 443olio_listio 444 445## 446## Operations relative to directory capabilities. 447## 448faccessat 449fstatat 450fchmodat 451fchownat 452futimesat 453linkat 454mkdirat 455mkfifoat 456mknodat 457openat 458readlinkat 459renameat 460symlinkat 461unlinkat 462 463## 464## Allow entry into open(2). This system call will fail, since access to the 465## global file namespace has been disallowed, but allowing entry into the 466## syscall means that an audit trail will be generated (which is also very 467## useful for debugging). 468## 469open 470 471## 472## Allow poll(2), which will be scoped by capability rights. 473## 474## XXXRW: Perhaps we don't need the OpenBSD version? 475## XXXRW: We don't yet do that scoping. 476## 477openbsd_poll 478 479## 480## Process descriptor-related system calls are allowed. 481## 482pdfork 483pdgetpid 484pdkill 485#pdwait4 # not yet implemented 486 487## 488## Allow pipe(2). 489## 490pipe 491 492## 493## Allow poll(2), which will be scoped by capability rights. 494## XXXRW: We don't yet do that scoping. 495## 496poll 497 498## 499## Allow I/O-related file descriptors, subject to capability rights. 500## 501pread 502preadv 503 504## 505## Allow access to profiling state on the current process. 506## 507profil 508 509## 510## Disallow ptrace(2) for now, but we do need debugging facilities in 511## capability mode, so we will want to revisit this, possibly by scoping its 512## operation. 513## 514#ptrace 515 516## 517## Allow I/O-related file descriptors, subject to capability rights. 518## 519pwrite 520pwritev 521read 522readv 523recv 524recvfrom 525recvmsg 526 527## 528## Allow real-time scheduling primitives to be used. 529## 530## XXXRW: These require scoping. 531## 532rtprio 533rtprio_thread 534 535## 536## Allow simple VM operations on the current process. 537## 538sbrk 539 540## 541## Allow querying trivial global scheduler state. 542## 543sched_get_priority_max 544sched_get_priority_min 545 546## 547## Allow various thread/process scheduler operations. 548## 549## XXXRW: Some of these require further scoping. 550## 551sched_getparam 552sched_getscheduler 553sched_rr_getinterval 554sched_setparam 555sched_setscheduler 556sched_yield 557 558## 559## Allow I/O-related file descriptors, subject to capability rights. 560## 561sctp_generic_recvmsg 562sctp_generic_sendmsg 563sctp_generic_sendmsg_iov 564sctp_peeloff 565 566## 567## Allow select(2), which will be scoped by capability rights. 568## 569## XXXRW: But is it? 570## 571select 572 573## 574## Allow I/O-related file descriptors, subject to capability rights. Use of 575## explicit addresses here is restricted by the system calls themselves. 576## 577send 578sendfile 579sendmsg 580sendto 581 582## 583## Allow setting per-process audit state, which is controlled separately by 584## privileges. 585## 586setaudit 587setaudit_addr 588setauid 589 590## 591## Allow setting thread context. 592## 593setcontext 594 595## 596## Allow setting current process credential state, which is controlled 597## separately by privilege. 598## 599setegid 600seteuid 601setgid 602 603## 604## Allow use of the process interval timer. 605## 606setitimer 607 608## 609## Allow setpriority(2). 610## 611## XXXRW: Requires scoping. 612## 613setpriority 614 615## 616## Allow setting current process credential state, which is controlled 617## separately by privilege. 618## 619setregid 620setresgid 621setresuid 622setreuid 623 624## 625## Allow setting process resource limits with setrlimit(2). 626## 627setrlimit 628 629## 630## Allow creating a new session with setsid(2). 631## 632setsid 633 634## 635## Allow setting socket options with setsockopt(2), subject to capability 636## rights. 637## 638## XXXRW: Might require scoping. 639## 640setsockopt 641 642## 643## Allow setting current process credential state, which is controlled 644## separately by privilege. 645## 646setuid 647 648## 649## shm_open(2) is scoped so as to allow only access to new anonymous objects. 650## 651shm_open 652 653## 654## Allow I/O-related file descriptors, subject to capability rights. 655## 656shutdown 657 658## 659## Allow signal control on current process. 660## 661sigaction 662sigaltstack 663sigblock 664sigpending 665sigprocmask 666sigqueue 667sigreturn 668sigsetmask 669sigstack 670sigsuspend 671sigtimedwait 672sigvec 673sigwaitinfo 674 675## 676## Allow creating new socket pairs with socket(2) and socketpair(2). 677## 678socket 679socketpair 680 681## 682## Allow simple VM operations on the current process. 683## 684## XXXRW: Kernel doesn't implement this, so drop? 685## 686sstk 687 688## 689## Do allow sync(2) for now, but possibly shouldn't. 690## 691sync 692 693## 694## Always allow process termination with sys_exit(2). 695## 696sys_exit 697 698## 699## sysarch(2) does rather diverse things, but is required on at least i386 700## in order to configure per-thread data. As such, it's scoped on each 701## architecture. 702## 703sysarch 704 705## 706## Allow thread operations operating only on current process. 707## 708thr_create 709thr_exit 710thr_kill 711 712## 713## Disallow thr_kill2(2), as it may operate beyond the current process. 714## 715## XXXRW: Requires scoping. 716## 717#thr_kill2 718 719## 720## Allow thread operations operating only on current process. 721## 722thr_new 723thr_self 724thr_set_name 725thr_suspend 726thr_wake 727 728## 729## Allow manipulation of the current process umask with umask(2). 730## 731umask 732 733## 734## Allow submitting of process trace entries with utrace(2). 735## 736utrace 737 738## 739## Allow generating UUIDs with uuidgen(2). 740## 741uuidgen 742 743## 744## Allow I/O-related file descriptors, subject to capability rights. 745## 746write 747writev 748 749## 750## Allow processes to yield(2). 751## 752yield 753