411 lines
12 KiB
C
411 lines
12 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2013 FreeBSD Foundation
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* All rights reserved.
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*
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* This software was developed by Pawel Jakub Dawidek under sponsorship from
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* 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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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/*
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* Note that this file is compiled into the kernel and into libc.
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*/
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#include <sys/types.h>
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#include <sys/capsicum.h>
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#ifdef _KERNEL
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <machine/stdarg.h>
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#else /* !_KERNEL */
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#include <assert.h>
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#include <stdarg.h>
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#include <stdbool.h>
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#include <stdint.h>
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#include <string.h>
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#endif
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#ifdef _KERNEL
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#define assert(exp) KASSERT((exp), ("%s:%u", __func__, __LINE__))
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__read_mostly cap_rights_t cap_accept_rights;
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__read_mostly cap_rights_t cap_bind_rights;
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__read_mostly cap_rights_t cap_chflags_rights;
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__read_mostly cap_rights_t cap_connect_rights;
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__read_mostly cap_rights_t cap_event_rights;
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__read_mostly cap_rights_t cap_fchdir_rights;
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__read_mostly cap_rights_t cap_fchflags_rights;
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__read_mostly cap_rights_t cap_fchmod_rights;
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__read_mostly cap_rights_t cap_fchown_rights;
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__read_mostly cap_rights_t cap_fcntl_rights;
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__read_mostly cap_rights_t cap_fexecve_rights;
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__read_mostly cap_rights_t cap_flock_rights;
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__read_mostly cap_rights_t cap_fpathconf_rights;
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__read_mostly cap_rights_t cap_fstat_rights;
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__read_mostly cap_rights_t cap_fstatfs_rights;
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__read_mostly cap_rights_t cap_fsync_rights;
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__read_mostly cap_rights_t cap_ftruncate_rights;
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__read_mostly cap_rights_t cap_futimes_rights;
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__read_mostly cap_rights_t cap_getpeername_rights;
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__read_mostly cap_rights_t cap_getsockopt_rights;
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__read_mostly cap_rights_t cap_getsockname_rights;
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__read_mostly cap_rights_t cap_ioctl_rights;
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__read_mostly cap_rights_t cap_listen_rights;
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__read_mostly cap_rights_t cap_linkat_source_rights;
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__read_mostly cap_rights_t cap_linkat_target_rights;
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__read_mostly cap_rights_t cap_mmap_rights;
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__read_mostly cap_rights_t cap_mkdirat_rights;
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__read_mostly cap_rights_t cap_mkfifoat_rights;
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__read_mostly cap_rights_t cap_mknodat_rights;
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__read_mostly cap_rights_t cap_pdgetpid_rights;
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__read_mostly cap_rights_t cap_pdkill_rights;
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__read_mostly cap_rights_t cap_pread_rights;
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__read_mostly cap_rights_t cap_pwrite_rights;
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__read_mostly cap_rights_t cap_read_rights;
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__read_mostly cap_rights_t cap_recv_rights;
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__read_mostly cap_rights_t cap_renameat_source_rights;
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__read_mostly cap_rights_t cap_renameat_target_rights;
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__read_mostly cap_rights_t cap_seek_rights;
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__read_mostly cap_rights_t cap_send_rights;
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__read_mostly cap_rights_t cap_send_connect_rights;
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__read_mostly cap_rights_t cap_setsockopt_rights;
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__read_mostly cap_rights_t cap_shutdown_rights;
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__read_mostly cap_rights_t cap_symlinkat_rights;
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__read_mostly cap_rights_t cap_unlinkat_rights;
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__read_mostly cap_rights_t cap_write_rights;
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__read_mostly cap_rights_t cap_no_rights;
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static void
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cap_rights_sysinit(void *arg)
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{
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cap_rights_init_one(&cap_accept_rights, CAP_ACCEPT);
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cap_rights_init_one(&cap_bind_rights, CAP_BIND);
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cap_rights_init_one(&cap_connect_rights, CAP_CONNECT);
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cap_rights_init_one(&cap_event_rights, CAP_EVENT);
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cap_rights_init_one(&cap_fchdir_rights, CAP_FCHDIR);
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cap_rights_init_one(&cap_fchflags_rights, CAP_FCHFLAGS);
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cap_rights_init_one(&cap_fchmod_rights, CAP_FCHMOD);
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cap_rights_init_one(&cap_fchown_rights, CAP_FCHOWN);
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cap_rights_init_one(&cap_fcntl_rights, CAP_FCNTL);
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cap_rights_init_one(&cap_fexecve_rights, CAP_FEXECVE);
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cap_rights_init_one(&cap_flock_rights, CAP_FLOCK);
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cap_rights_init_one(&cap_fpathconf_rights, CAP_FPATHCONF);
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cap_rights_init_one(&cap_fstat_rights, CAP_FSTAT);
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cap_rights_init_one(&cap_fstatfs_rights, CAP_FSTATFS);
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cap_rights_init_one(&cap_fsync_rights, CAP_FSYNC);
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cap_rights_init_one(&cap_ftruncate_rights, CAP_FTRUNCATE);
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cap_rights_init_one(&cap_futimes_rights, CAP_FUTIMES);
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cap_rights_init_one(&cap_getpeername_rights, CAP_GETPEERNAME);
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cap_rights_init_one(&cap_getsockname_rights, CAP_GETSOCKNAME);
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cap_rights_init_one(&cap_getsockopt_rights, CAP_GETSOCKOPT);
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cap_rights_init_one(&cap_ioctl_rights, CAP_IOCTL);
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cap_rights_init_one(&cap_linkat_source_rights, CAP_LINKAT_SOURCE);
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cap_rights_init_one(&cap_linkat_target_rights, CAP_LINKAT_TARGET);
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cap_rights_init_one(&cap_listen_rights, CAP_LISTEN);
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cap_rights_init_one(&cap_mkdirat_rights, CAP_MKDIRAT);
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cap_rights_init_one(&cap_mkfifoat_rights, CAP_MKFIFOAT);
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cap_rights_init_one(&cap_mknodat_rights, CAP_MKNODAT);
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cap_rights_init_one(&cap_mmap_rights, CAP_MMAP);
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cap_rights_init_one(&cap_pdgetpid_rights, CAP_PDGETPID);
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cap_rights_init_one(&cap_pdkill_rights, CAP_PDKILL);
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cap_rights_init_one(&cap_pread_rights, CAP_PREAD);
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cap_rights_init_one(&cap_pwrite_rights, CAP_PWRITE);
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cap_rights_init_one(&cap_read_rights, CAP_READ);
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cap_rights_init_one(&cap_recv_rights, CAP_RECV);
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cap_rights_init_one(&cap_renameat_source_rights, CAP_RENAMEAT_SOURCE);
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cap_rights_init_one(&cap_renameat_target_rights, CAP_RENAMEAT_TARGET);
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cap_rights_init_one(&cap_seek_rights, CAP_SEEK);
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cap_rights_init_one(&cap_send_rights, CAP_SEND);
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cap_rights_init(&cap_send_connect_rights, CAP_SEND, CAP_CONNECT);
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cap_rights_init_one(&cap_setsockopt_rights, CAP_SETSOCKOPT);
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cap_rights_init_one(&cap_shutdown_rights, CAP_SHUTDOWN);
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cap_rights_init_one(&cap_symlinkat_rights, CAP_SYMLINKAT);
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cap_rights_init_one(&cap_unlinkat_rights, CAP_UNLINKAT);
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cap_rights_init_one(&cap_write_rights, CAP_WRITE);
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cap_rights_init(&cap_no_rights);
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}
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SYSINIT(cap_rights_sysinit, SI_SUB_COPYRIGHT, SI_ORDER_ANY, cap_rights_sysinit,
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NULL);
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#endif
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#define CAPARSIZE_MIN (CAP_RIGHTS_VERSION_00 + 2)
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#define CAPARSIZE_MAX (CAP_RIGHTS_VERSION + 2)
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static __inline int
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right_to_index(uint64_t right)
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{
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static const int bit2idx[] = {
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-1, 0, 1, -1, 2, -1, -1, -1, 3, -1, -1, -1, -1, -1, -1, -1,
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4, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1
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};
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int idx;
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idx = CAPIDXBIT(right);
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assert(idx >= 0 && idx < sizeof(bit2idx) / sizeof(bit2idx[0]));
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return (bit2idx[idx]);
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}
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static void
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cap_rights_vset(cap_rights_t *rights, va_list ap)
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{
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uint64_t right;
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int i, n __unused;
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assert(CAPVER(rights) == CAP_RIGHTS_VERSION_00);
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n = CAPARSIZE(rights);
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assert(n >= CAPARSIZE_MIN && n <= CAPARSIZE_MAX);
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for (;;) {
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right = (uint64_t)va_arg(ap, unsigned long long);
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if (right == 0)
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break;
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assert(CAPRVER(right) == 0);
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i = right_to_index(right);
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assert(i >= 0);
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assert(i < n);
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assert(CAPIDXBIT(rights->cr_rights[i]) == CAPIDXBIT(right));
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rights->cr_rights[i] |= right;
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assert(CAPIDXBIT(rights->cr_rights[i]) == CAPIDXBIT(right));
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}
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}
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static void
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cap_rights_vclear(cap_rights_t *rights, va_list ap)
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{
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uint64_t right;
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int i, n __unused;
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assert(CAPVER(rights) == CAP_RIGHTS_VERSION_00);
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n = CAPARSIZE(rights);
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assert(n >= CAPARSIZE_MIN && n <= CAPARSIZE_MAX);
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for (;;) {
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right = (uint64_t)va_arg(ap, unsigned long long);
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if (right == 0)
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break;
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assert(CAPRVER(right) == 0);
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i = right_to_index(right);
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assert(i >= 0);
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assert(i < n);
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assert(CAPIDXBIT(rights->cr_rights[i]) == CAPIDXBIT(right));
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rights->cr_rights[i] &= ~(right & 0x01FFFFFFFFFFFFFFULL);
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assert(CAPIDXBIT(rights->cr_rights[i]) == CAPIDXBIT(right));
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}
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}
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static bool
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cap_rights_is_vset(const cap_rights_t *rights, va_list ap)
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{
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uint64_t right;
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int i, n __unused;
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assert(CAPVER(rights) == CAP_RIGHTS_VERSION_00);
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n = CAPARSIZE(rights);
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assert(n >= CAPARSIZE_MIN && n <= CAPARSIZE_MAX);
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for (;;) {
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right = (uint64_t)va_arg(ap, unsigned long long);
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if (right == 0)
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break;
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assert(CAPRVER(right) == 0);
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i = right_to_index(right);
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assert(i >= 0);
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assert(i < n);
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assert(CAPIDXBIT(rights->cr_rights[i]) == CAPIDXBIT(right));
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if ((rights->cr_rights[i] & right) != right)
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return (false);
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}
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return (true);
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}
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cap_rights_t *
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__cap_rights_init(int version, cap_rights_t *rights, ...)
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{
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unsigned int n __unused;
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va_list ap;
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assert(version == CAP_RIGHTS_VERSION_00);
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n = version + 2;
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assert(n >= CAPARSIZE_MIN && n <= CAPARSIZE_MAX);
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CAP_NONE(rights);
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va_start(ap, rights);
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cap_rights_vset(rights, ap);
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va_end(ap);
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return (rights);
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}
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cap_rights_t *
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__cap_rights_set(cap_rights_t *rights, ...)
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{
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va_list ap;
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assert(CAPVER(rights) == CAP_RIGHTS_VERSION_00);
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va_start(ap, rights);
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cap_rights_vset(rights, ap);
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va_end(ap);
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return (rights);
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}
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cap_rights_t *
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__cap_rights_clear(cap_rights_t *rights, ...)
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{
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va_list ap;
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assert(CAPVER(rights) == CAP_RIGHTS_VERSION_00);
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va_start(ap, rights);
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cap_rights_vclear(rights, ap);
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va_end(ap);
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return (rights);
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}
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bool
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__cap_rights_is_set(const cap_rights_t *rights, ...)
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{
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va_list ap;
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bool ret;
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assert(CAPVER(rights) == CAP_RIGHTS_VERSION_00);
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va_start(ap, rights);
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ret = cap_rights_is_vset(rights, ap);
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va_end(ap);
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return (ret);
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}
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bool
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cap_rights_is_valid(const cap_rights_t *rights)
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{
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cap_rights_t allrights;
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int i, j;
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if (CAPVER(rights) != CAP_RIGHTS_VERSION_00)
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return (false);
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if (CAPARSIZE(rights) < CAPARSIZE_MIN ||
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CAPARSIZE(rights) > CAPARSIZE_MAX) {
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return (false);
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}
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CAP_ALL(&allrights);
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if (!cap_rights_contains(&allrights, rights))
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return (false);
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for (i = 0; i < CAPARSIZE(rights); i++) {
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j = right_to_index(rights->cr_rights[i]);
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if (i != j)
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return (false);
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if (i > 0) {
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if (CAPRVER(rights->cr_rights[i]) != 0)
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return (false);
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}
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}
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return (true);
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}
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cap_rights_t *
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cap_rights_merge(cap_rights_t *dst, const cap_rights_t *src)
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{
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unsigned int i, n;
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assert(CAPVER(dst) == CAP_RIGHTS_VERSION_00);
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assert(CAPVER(src) == CAP_RIGHTS_VERSION_00);
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assert(CAPVER(dst) == CAPVER(src));
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assert(cap_rights_is_valid(src));
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assert(cap_rights_is_valid(dst));
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n = CAPARSIZE(dst);
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assert(n >= CAPARSIZE_MIN && n <= CAPARSIZE_MAX);
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for (i = 0; i < n; i++)
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dst->cr_rights[i] |= src->cr_rights[i];
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assert(cap_rights_is_valid(src));
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assert(cap_rights_is_valid(dst));
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return (dst);
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}
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cap_rights_t *
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cap_rights_remove(cap_rights_t *dst, const cap_rights_t *src)
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{
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unsigned int i, n;
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assert(CAPVER(dst) == CAP_RIGHTS_VERSION_00);
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assert(CAPVER(src) == CAP_RIGHTS_VERSION_00);
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assert(CAPVER(dst) == CAPVER(src));
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assert(cap_rights_is_valid(src));
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assert(cap_rights_is_valid(dst));
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n = CAPARSIZE(dst);
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assert(n >= CAPARSIZE_MIN && n <= CAPARSIZE_MAX);
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for (i = 0; i < n; i++) {
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dst->cr_rights[i] &=
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~(src->cr_rights[i] & 0x01FFFFFFFFFFFFFFULL);
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}
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assert(cap_rights_is_valid(src));
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assert(cap_rights_is_valid(dst));
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return (dst);
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}
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#ifndef _KERNEL
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bool
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cap_rights_contains(const cap_rights_t *big, const cap_rights_t *little)
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{
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unsigned int i, n;
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assert(CAPVER(big) == CAP_RIGHTS_VERSION_00);
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assert(CAPVER(little) == CAP_RIGHTS_VERSION_00);
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assert(CAPVER(big) == CAPVER(little));
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n = CAPARSIZE(big);
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assert(n >= CAPARSIZE_MIN && n <= CAPARSIZE_MAX);
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for (i = 0; i < n; i++) {
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if ((big->cr_rights[i] & little->cr_rights[i]) !=
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little->cr_rights[i]) {
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return (false);
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}
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}
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return (true);
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}
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#endif
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