308 lines
7.1 KiB
C
308 lines
7.1 KiB
C
/*-
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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 <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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#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;
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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;
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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;
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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;
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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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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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