/* $NetBSD: fsaccess.c,v 1.1.4.2 2024/02/29 11:39:00 martin Exp $ */ /* * 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 #include #include #include #include /*! * Shorthand. Maybe ISC__FSACCESS_PERMISSIONBITS should not even be in * . 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); }