427 lines
15 KiB
C
427 lines
15 KiB
C
/*-
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* Copyright (c) 2008-2010, 2015 Robert N. M. Watson
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* Copyright (c) 2012 FreeBSD Foundation
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* All rights reserved.
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*
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* This software was developed at the University of Cambridge Computer
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* Laboratory with support from a grant from Google, Inc.
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*
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* Portions of this software were developed by Pawel Jakub Dawidek under
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* sponsorship from the FreeBSD Foundation.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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/*
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* Definitions for FreeBSD capabilities facility.
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*/
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#ifndef _SYS_CAPSICUM_H_
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#define _SYS_CAPSICUM_H_
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#include <sys/cdefs.h>
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#include <sys/param.h>
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#include <sys/caprights.h>
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#include <sys/file.h>
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#include <sys/fcntl.h>
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#ifndef _KERNEL
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#include <stdbool.h>
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#endif
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#define CAPRIGHT(idx, bit) ((1ULL << (57 + (idx))) | (bit))
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/*
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* Possible rights on capabilities.
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*
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* Notes:
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* Some system calls don't require a capability in order to perform an
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* operation on an fd. These include: close, dup, dup2.
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*
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* sendfile is authorized using CAP_READ on the file and CAP_WRITE on the
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* socket.
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*
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* mmap() and aio*() system calls will need special attention as they may
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* involve reads or writes depending a great deal on context.
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*/
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/* INDEX 0 */
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/*
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* General file I/O.
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*/
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/* Allows for openat(O_RDONLY), read(2), readv(2). */
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#define CAP_READ CAPRIGHT(0, 0x0000000000000001ULL)
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/* Allows for openat(O_WRONLY | O_APPEND), write(2), writev(2). */
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#define CAP_WRITE CAPRIGHT(0, 0x0000000000000002ULL)
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/* Allows for lseek(fd, 0, SEEK_CUR). */
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#define CAP_SEEK_TELL CAPRIGHT(0, 0x0000000000000004ULL)
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/* Allows for lseek(2). */
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#define CAP_SEEK (CAP_SEEK_TELL | 0x0000000000000008ULL)
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/* Allows for aio_read(2), pread(2), preadv(2). */
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#define CAP_PREAD (CAP_SEEK | CAP_READ)
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/*
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* Allows for aio_write(2), openat(O_WRONLY) (without O_APPEND), pwrite(2),
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* pwritev(2).
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*/
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#define CAP_PWRITE (CAP_SEEK | CAP_WRITE)
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/* Allows for mmap(PROT_NONE). */
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#define CAP_MMAP CAPRIGHT(0, 0x0000000000000010ULL)
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/* Allows for mmap(PROT_READ). */
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#define CAP_MMAP_R (CAP_MMAP | CAP_SEEK | CAP_READ)
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/* Allows for mmap(PROT_WRITE). */
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#define CAP_MMAP_W (CAP_MMAP | CAP_SEEK | CAP_WRITE)
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/* Allows for mmap(PROT_EXEC). */
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#define CAP_MMAP_X (CAP_MMAP | CAP_SEEK | 0x0000000000000020ULL)
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/* Allows for mmap(PROT_READ | PROT_WRITE). */
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#define CAP_MMAP_RW (CAP_MMAP_R | CAP_MMAP_W)
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/* Allows for mmap(PROT_READ | PROT_EXEC). */
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#define CAP_MMAP_RX (CAP_MMAP_R | CAP_MMAP_X)
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/* Allows for mmap(PROT_WRITE | PROT_EXEC). */
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#define CAP_MMAP_WX (CAP_MMAP_W | CAP_MMAP_X)
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/* Allows for mmap(PROT_READ | PROT_WRITE | PROT_EXEC). */
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#define CAP_MMAP_RWX (CAP_MMAP_R | CAP_MMAP_W | CAP_MMAP_X)
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/* Allows for openat(O_CREAT). */
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#define CAP_CREATE CAPRIGHT(0, 0x0000000000000040ULL)
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/* Allows for openat(O_EXEC) and fexecve(2) in turn. */
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#define CAP_FEXECVE CAPRIGHT(0, 0x0000000000000080ULL)
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/* Allows for openat(O_SYNC), openat(O_FSYNC), fsync(2), aio_fsync(2). */
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#define CAP_FSYNC CAPRIGHT(0, 0x0000000000000100ULL)
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/* Allows for openat(O_TRUNC), ftruncate(2). */
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#define CAP_FTRUNCATE CAPRIGHT(0, 0x0000000000000200ULL)
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/* Lookups - used to constrain *at() calls. */
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#define CAP_LOOKUP CAPRIGHT(0, 0x0000000000000400ULL)
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/* VFS methods. */
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/* Allows for fchdir(2). */
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#define CAP_FCHDIR CAPRIGHT(0, 0x0000000000000800ULL)
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/* Allows for fchflags(2). */
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#define CAP_FCHFLAGS CAPRIGHT(0, 0x0000000000001000ULL)
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/* Allows for fchflags(2) and chflagsat(2). */
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#define CAP_CHFLAGSAT (CAP_FCHFLAGS | CAP_LOOKUP)
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/* Allows for fchmod(2). */
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#define CAP_FCHMOD CAPRIGHT(0, 0x0000000000002000ULL)
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/* Allows for fchmod(2) and fchmodat(2). */
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#define CAP_FCHMODAT (CAP_FCHMOD | CAP_LOOKUP)
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/* Allows for fchown(2). */
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#define CAP_FCHOWN CAPRIGHT(0, 0x0000000000004000ULL)
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/* Allows for fchown(2) and fchownat(2). */
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#define CAP_FCHOWNAT (CAP_FCHOWN | CAP_LOOKUP)
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/* Allows for fcntl(2). */
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#define CAP_FCNTL CAPRIGHT(0, 0x0000000000008000ULL)
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/*
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* Allows for flock(2), openat(O_SHLOCK), openat(O_EXLOCK),
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* fcntl(F_SETLK_REMOTE), fcntl(F_SETLKW), fcntl(F_SETLK), fcntl(F_GETLK).
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*/
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#define CAP_FLOCK CAPRIGHT(0, 0x0000000000010000ULL)
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/* Allows for fpathconf(2). */
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#define CAP_FPATHCONF CAPRIGHT(0, 0x0000000000020000ULL)
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/* Allows for UFS background-fsck operations. */
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#define CAP_FSCK CAPRIGHT(0, 0x0000000000040000ULL)
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/* Allows for fstat(2). */
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#define CAP_FSTAT CAPRIGHT(0, 0x0000000000080000ULL)
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/* Allows for fstat(2), fstatat(2) and faccessat(2). */
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#define CAP_FSTATAT (CAP_FSTAT | CAP_LOOKUP)
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/* Allows for fstatfs(2). */
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#define CAP_FSTATFS CAPRIGHT(0, 0x0000000000100000ULL)
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/* Allows for futimens(2) and futimes(2). */
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#define CAP_FUTIMES CAPRIGHT(0, 0x0000000000200000ULL)
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/* Allows for futimens(2), futimes(2), futimesat(2) and utimensat(2). */
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#define CAP_FUTIMESAT (CAP_FUTIMES | CAP_LOOKUP)
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/* Allows for linkat(2) (target directory descriptor). */
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#define CAP_LINKAT_TARGET (CAP_LOOKUP | 0x0000000000400000ULL)
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/* Allows for mkdirat(2). */
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#define CAP_MKDIRAT (CAP_LOOKUP | 0x0000000000800000ULL)
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/* Allows for mkfifoat(2). */
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#define CAP_MKFIFOAT (CAP_LOOKUP | 0x0000000001000000ULL)
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/* Allows for mknodat(2). */
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#define CAP_MKNODAT (CAP_LOOKUP | 0x0000000002000000ULL)
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/* Allows for renameat(2) (source directory descriptor). */
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#define CAP_RENAMEAT_SOURCE (CAP_LOOKUP | 0x0000000004000000ULL)
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/* Allows for symlinkat(2). */
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#define CAP_SYMLINKAT (CAP_LOOKUP | 0x0000000008000000ULL)
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/*
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* Allows for unlinkat(2) and renameat(2) if destination object exists and
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* will be removed.
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*/
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#define CAP_UNLINKAT (CAP_LOOKUP | 0x0000000010000000ULL)
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/* Socket operations. */
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/* Allows for accept(2) and accept4(2). */
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#define CAP_ACCEPT CAPRIGHT(0, 0x0000000020000000ULL)
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/* Allows for bind(2). */
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#define CAP_BIND CAPRIGHT(0, 0x0000000040000000ULL)
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/* Allows for connect(2). */
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#define CAP_CONNECT CAPRIGHT(0, 0x0000000080000000ULL)
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/* Allows for getpeername(2). */
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#define CAP_GETPEERNAME CAPRIGHT(0, 0x0000000100000000ULL)
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/* Allows for getsockname(2). */
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#define CAP_GETSOCKNAME CAPRIGHT(0, 0x0000000200000000ULL)
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/* Allows for getsockopt(2). */
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#define CAP_GETSOCKOPT CAPRIGHT(0, 0x0000000400000000ULL)
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/* Allows for listen(2). */
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#define CAP_LISTEN CAPRIGHT(0, 0x0000000800000000ULL)
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/* Allows for sctp_peeloff(2). */
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#define CAP_PEELOFF CAPRIGHT(0, 0x0000001000000000ULL)
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#define CAP_RECV CAP_READ
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#define CAP_SEND CAP_WRITE
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/* Allows for setsockopt(2). */
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#define CAP_SETSOCKOPT CAPRIGHT(0, 0x0000002000000000ULL)
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/* Allows for shutdown(2). */
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#define CAP_SHUTDOWN CAPRIGHT(0, 0x0000004000000000ULL)
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/* Allows for bindat(2) on a directory descriptor. */
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#define CAP_BINDAT (CAP_LOOKUP | 0x0000008000000000ULL)
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/* Allows for connectat(2) on a directory descriptor. */
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#define CAP_CONNECTAT (CAP_LOOKUP | 0x0000010000000000ULL)
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/* Allows for linkat(2) (source directory descriptor). */
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#define CAP_LINKAT_SOURCE (CAP_LOOKUP | 0x0000020000000000ULL)
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/* Allows for renameat(2) (target directory descriptor). */
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#define CAP_RENAMEAT_TARGET (CAP_LOOKUP | 0x0000040000000000ULL)
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#define CAP_SOCK_CLIENT \
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(CAP_CONNECT | CAP_GETPEERNAME | CAP_GETSOCKNAME | CAP_GETSOCKOPT | \
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CAP_PEELOFF | CAP_RECV | CAP_SEND | CAP_SETSOCKOPT | CAP_SHUTDOWN)
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#define CAP_SOCK_SERVER \
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(CAP_ACCEPT | CAP_BIND | CAP_GETPEERNAME | CAP_GETSOCKNAME | \
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CAP_GETSOCKOPT | CAP_LISTEN | CAP_PEELOFF | CAP_RECV | CAP_SEND | \
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CAP_SETSOCKOPT | CAP_SHUTDOWN)
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/* All used bits for index 0. */
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#define CAP_ALL0 CAPRIGHT(0, 0x000007FFFFFFFFFFULL)
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/* Available bits for index 0. */
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#define CAP_UNUSED0_44 CAPRIGHT(0, 0x0000080000000000ULL)
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/* ... */
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#define CAP_UNUSED0_57 CAPRIGHT(0, 0x0100000000000000ULL)
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/* INDEX 1 */
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/* Mandatory Access Control. */
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/* Allows for mac_get_fd(3). */
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#define CAP_MAC_GET CAPRIGHT(1, 0x0000000000000001ULL)
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/* Allows for mac_set_fd(3). */
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#define CAP_MAC_SET CAPRIGHT(1, 0x0000000000000002ULL)
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/* Methods on semaphores. */
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#define CAP_SEM_GETVALUE CAPRIGHT(1, 0x0000000000000004ULL)
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#define CAP_SEM_POST CAPRIGHT(1, 0x0000000000000008ULL)
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#define CAP_SEM_WAIT CAPRIGHT(1, 0x0000000000000010ULL)
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/* Allows select(2) and poll(2) on descriptor. */
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#define CAP_EVENT CAPRIGHT(1, 0x0000000000000020ULL)
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/* Allows for kevent(2) on kqueue descriptor with eventlist != NULL. */
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#define CAP_KQUEUE_EVENT CAPRIGHT(1, 0x0000000000000040ULL)
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/* Strange and powerful rights that should not be given lightly. */
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/* Allows for ioctl(2). */
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#define CAP_IOCTL CAPRIGHT(1, 0x0000000000000080ULL)
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#define CAP_TTYHOOK CAPRIGHT(1, 0x0000000000000100ULL)
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/* Process management via process descriptors. */
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/* Allows for pdgetpid(2). */
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#define CAP_PDGETPID CAPRIGHT(1, 0x0000000000000200ULL)
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/* Allows for pdwait4(2). */
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#define CAP_PDWAIT CAPRIGHT(1, 0x0000000000000400ULL)
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/* Allows for pdkill(2). */
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#define CAP_PDKILL CAPRIGHT(1, 0x0000000000000800ULL)
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/* Extended attributes. */
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/* Allows for extattr_delete_fd(2). */
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#define CAP_EXTATTR_DELETE CAPRIGHT(1, 0x0000000000001000ULL)
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/* Allows for extattr_get_fd(2). */
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#define CAP_EXTATTR_GET CAPRIGHT(1, 0x0000000000002000ULL)
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/* Allows for extattr_list_fd(2). */
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#define CAP_EXTATTR_LIST CAPRIGHT(1, 0x0000000000004000ULL)
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/* Allows for extattr_set_fd(2). */
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#define CAP_EXTATTR_SET CAPRIGHT(1, 0x0000000000008000ULL)
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/* Access Control Lists. */
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/* Allows for acl_valid_fd_np(3). */
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#define CAP_ACL_CHECK CAPRIGHT(1, 0x0000000000010000ULL)
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/* Allows for acl_delete_fd_np(3). */
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#define CAP_ACL_DELETE CAPRIGHT(1, 0x0000000000020000ULL)
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/* Allows for acl_get_fd(3) and acl_get_fd_np(3). */
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#define CAP_ACL_GET CAPRIGHT(1, 0x0000000000040000ULL)
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/* Allows for acl_set_fd(3) and acl_set_fd_np(3). */
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#define CAP_ACL_SET CAPRIGHT(1, 0x0000000000080000ULL)
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/* Allows for kevent(2) on kqueue descriptor with changelist != NULL. */
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#define CAP_KQUEUE_CHANGE CAPRIGHT(1, 0x0000000000100000ULL)
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#define CAP_KQUEUE (CAP_KQUEUE_EVENT | CAP_KQUEUE_CHANGE)
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/* All used bits for index 1. */
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#define CAP_ALL1 CAPRIGHT(1, 0x00000000001FFFFFULL)
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/* Available bits for index 1. */
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#define CAP_UNUSED1_22 CAPRIGHT(1, 0x0000000000200000ULL)
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/* ... */
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#define CAP_UNUSED1_57 CAPRIGHT(1, 0x0100000000000000ULL)
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/* Backward compatibility. */
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#define CAP_POLL_EVENT CAP_EVENT
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#define CAP_ALL(rights) do { \
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(rights)->cr_rights[0] = \
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((uint64_t)CAP_RIGHTS_VERSION << 62) | CAP_ALL0; \
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(rights)->cr_rights[1] = CAP_ALL1; \
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} while (0)
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#define CAP_NONE(rights) do { \
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(rights)->cr_rights[0] = \
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((uint64_t)CAP_RIGHTS_VERSION << 62) | CAPRIGHT(0, 0ULL); \
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(rights)->cr_rights[1] = CAPRIGHT(1, 0ULL); \
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} while (0)
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#define CAPRVER(right) ((int)((right) >> 62))
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#define CAPVER(rights) CAPRVER((rights)->cr_rights[0])
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#define CAPARSIZE(rights) (CAPVER(rights) + 2)
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#define CAPIDXBIT(right) ((int)(((right) >> 57) & 0x1F))
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/*
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* Allowed fcntl(2) commands.
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*/
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#define CAP_FCNTL_GETFL (1 << F_GETFL)
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#define CAP_FCNTL_SETFL (1 << F_SETFL)
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#define CAP_FCNTL_GETOWN (1 << F_GETOWN)
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#define CAP_FCNTL_SETOWN (1 << F_SETOWN)
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#define CAP_FCNTL_ALL (CAP_FCNTL_GETFL | CAP_FCNTL_SETFL | \
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CAP_FCNTL_GETOWN | CAP_FCNTL_SETOWN)
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#define CAP_IOCTLS_ALL SSIZE_MAX
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__BEGIN_DECLS
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#define cap_rights_init(...) \
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__cap_rights_init(CAP_RIGHTS_VERSION, __VA_ARGS__, 0ULL)
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cap_rights_t *__cap_rights_init(int version, cap_rights_t *rights, ...);
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#define cap_rights_set(...) \
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__cap_rights_set(__VA_ARGS__, 0ULL)
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cap_rights_t *__cap_rights_set(cap_rights_t *rights, ...);
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#define cap_rights_clear(...) \
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__cap_rights_clear(__VA_ARGS__, 0ULL)
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cap_rights_t *__cap_rights_clear(cap_rights_t *rights, ...);
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#define cap_rights_is_set(...) \
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__cap_rights_is_set(__VA_ARGS__, 0ULL)
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bool __cap_rights_is_set(const cap_rights_t *rights, ...);
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bool cap_rights_is_valid(const cap_rights_t *rights);
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cap_rights_t *cap_rights_merge(cap_rights_t *dst, const cap_rights_t *src);
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cap_rights_t *cap_rights_remove(cap_rights_t *dst, const cap_rights_t *src);
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bool cap_rights_contains(const cap_rights_t *big, const cap_rights_t *little);
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__END_DECLS
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#ifdef _KERNEL
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#include <sys/systm.h>
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#define IN_CAPABILITY_MODE(td) (((td)->td_ucred->cr_flags & CRED_FLAG_CAPMODE) != 0)
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struct filedesc;
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struct filedescent;
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/*
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* Test whether a capability grants the requested rights.
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*/
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int cap_check(const cap_rights_t *havep, const cap_rights_t *needp);
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/*
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* Convert capability rights into VM access flags.
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*/
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u_char cap_rights_to_vmprot(cap_rights_t *havep);
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/*
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* For the purposes of procstat(1) and similar tools, allow kern_descrip.c to
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* extract the rights from a capability.
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*/
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cap_rights_t *cap_rights_fde(struct filedescent *fde);
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cap_rights_t *cap_rights(struct filedesc *fdp, int fd);
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int cap_ioctl_check(struct filedesc *fdp, int fd, u_long cmd);
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int cap_fcntl_check_fde(struct filedescent *fde, int cmd);
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int cap_fcntl_check(struct filedesc *fdp, int fd, int cmd);
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#else /* !_KERNEL */
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__BEGIN_DECLS
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/*
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* cap_enter(): Cause the process to enter capability mode, which will
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* prevent it from directly accessing global namespaces. System calls will
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* be limited to process-local, process-inherited, or file descriptor
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* operations. If already in capability mode, a no-op.
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*/
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int cap_enter(void);
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/*
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* Are we sandboxed (in capability mode)?
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* This is a libc wrapper around the cap_getmode(2) system call.
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*/
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bool cap_sandboxed(void);
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/*
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* cap_getmode(): Are we in capability mode?
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*/
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int cap_getmode(u_int *modep);
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/*
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* Limits capability rights for the given descriptor (CAP_*).
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*/
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int cap_rights_limit(int fd, const cap_rights_t *rights);
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/*
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* Returns capability rights for the given descriptor.
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*/
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#define cap_rights_get(fd, rights) \
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__cap_rights_get(CAP_RIGHTS_VERSION, (fd), (rights))
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int __cap_rights_get(int version, int fd, cap_rights_t *rights);
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/*
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* Limits allowed ioctls for the given descriptor.
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*/
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int cap_ioctls_limit(int fd, const cap_ioctl_t *cmds, size_t ncmds);
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/*
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* Returns array of allowed ioctls for the given descriptor.
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* If all ioctls are allowed, the cmds array is not populated and
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* the function returns CAP_IOCTLS_ALL.
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*/
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ssize_t cap_ioctls_get(int fd, cap_ioctl_t *cmds, size_t maxcmds);
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/*
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* Limits allowed fcntls for the given descriptor (CAP_FCNTL_*).
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|
*/
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int cap_fcntls_limit(int fd, uint32_t fcntlrights);
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/*
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* Returns bitmask of allowed fcntls for the given descriptor.
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|
*/
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int cap_fcntls_get(int fd, uint32_t *fcntlrightsp);
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__END_DECLS
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#endif /* !_KERNEL */
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#endif /* !_SYS_CAPSICUM_H_ */
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