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/*
* Copyright (C) Internet Systems Consortium, Inc. ("ISC")
*
* SPDX-License-Identifier: MPL-2.0
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, you can obtain one at https://mozilla.org/MPL/2.0/.
*
* See the COPYRIGHT file distributed with this work for additional
* information regarding copyright ownership.
*/
/*! \file
* \brief
* This file contains the OS-independent functionality of the API.
*/
#include <stdbool.h>
#include <isc/fsaccess.h>
#include <isc/print.h>
#include <isc/result.h>
#include <isc/util.h>
/*!
* Shorthand. Maybe ISC__FSACCESS_PERMISSIONBITS should not even be in
* <isc/fsaccess.h>. Could check consistency with sizeof(isc_fsaccess_t)
* and the number of bits in each function.
*/
#define STEP (ISC__FSACCESS_PERMISSIONBITS)
#define GROUP (STEP)
#define OTHER (STEP * 2)
void
isc_fsaccess_add(int trustee, int permission, isc_fsaccess_t *access) {
REQUIRE(trustee <= 0x7);
REQUIRE(permission <= 0xFF);
if ((trustee & ISC_FSACCESS_OWNER) != 0) {
*access |= permission;
}
if ((trustee & ISC_FSACCESS_GROUP) != 0) {
*access |= (permission << GROUP);
}
if ((trustee & ISC_FSACCESS_OTHER) != 0) {
*access |= (permission << OTHER);
}
}
void
isc_fsaccess_remove(int trustee, int permission, isc_fsaccess_t *access) {
REQUIRE(trustee <= 0x7);
REQUIRE(permission <= 0xFF);
if ((trustee & ISC_FSACCESS_OWNER) != 0) {
*access &= ~permission;
}
if ((trustee & ISC_FSACCESS_GROUP) != 0) {
*access &= ~(permission << GROUP);
}
if ((trustee & ISC_FSACCESS_OTHER) != 0) {
*access &= ~(permission << OTHER);
}
}
static isc_result_t
check_bad_bits(isc_fsaccess_t access, bool is_dir) {
isc_fsaccess_t bits;
/*
* Check for disallowed user bits.
*/
if (is_dir) {
bits = ISC_FSACCESS_READ | ISC_FSACCESS_WRITE |
ISC_FSACCESS_EXECUTE;
} else {
bits = ISC_FSACCESS_CREATECHILD | ISC_FSACCESS_ACCESSCHILD |
ISC_FSACCESS_DELETECHILD | ISC_FSACCESS_LISTDIRECTORY;
}
/*
* Set group bad bits.
*/
bits |= bits << STEP;
/*
* Set other bad bits.
*/
bits |= bits << STEP;
if ((access & bits) != 0) {
if (is_dir) {
return (ISC_R_NOTFILE);
} else {
return (ISC_R_NOTDIRECTORY);
}
}
return (ISC_R_SUCCESS);
}
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