1/* $NetBSD: mask.c,v 1.1 2020/05/16 18:31:45 christos Exp $ */ 2 3/*- 4 * Copyright (c) 2001-2002 Chris D. Faulhaber 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29#include <sys/cdefs.h> 30#if 0 31__FBSDID("$FreeBSD: head/bin/setfacl/mask.c 333065 2018-04-27 15:25:24Z emaste $"); 32#else 33__RCSID("$NetBSD: mask.c,v 1.1 2020/05/16 18:31:45 christos Exp $"); 34#endif 35 36#include <sys/types.h> 37#include <sys/acl.h> 38#include <sys/stat.h> 39 40#include <err.h> 41#include <errno.h> 42#include <stdio.h> 43#include <stdlib.h> 44 45#include "setfacl.h" 46 47/* set the appropriate mask the given ACL's */ 48int 49set_acl_mask(acl_t *prev_acl, const char *filename) 50{ 51 acl_entry_t entry; 52 acl_t acl; 53 acl_tag_t tag; 54 int entry_id; 55 56 entry = NULL; 57 58 /* 59 * ... if a mask entry is specified, then the permissions of the mask 60 * entry in the resulting ACL shall be set to the permissions in the 61 * specified ACL mask entry. 62 */ 63 if (have_mask) 64 return (0); 65 66 acl = acl_dup(*prev_acl); 67 if (acl == NULL) 68 err(1, "%s: acl_dup() failed", filename); 69 70 if (!n_flag) { 71 /* 72 * If no mask entry is specified and the -n option is not 73 * specified, then the permissions of the resulting ACL mask 74 * entry shall be set to the union of the permissions 75 * associated with all entries which belong to the file group 76 * class in the resulting ACL 77 */ 78 if (acl_calc_mask(&acl)) { 79 warn("%s: acl_calc_mask() failed", filename); 80 acl_free(acl); 81 return (-1); 82 } 83 } else { 84 /* 85 * If no mask entry is specified and the -n option is 86 * specified, then the permissions of the resulting ACL 87 * mask entry shall remain unchanged ... 88 */ 89 90 entry_id = ACL_FIRST_ENTRY; 91 92 while (acl_get_entry(acl, entry_id, &entry) == 1) { 93 entry_id = ACL_NEXT_ENTRY; 94 if (acl_get_tag_type(entry, &tag) == -1) 95 err(1, "%s: acl_get_tag_type() failed", 96 filename); 97 98 if (tag == ACL_MASK) { 99 acl_free(acl); 100 return (0); 101 } 102 } 103 104 /* 105 * If no mask entry is specified, the -n option is specified, 106 * and no ACL mask entry exists in the ACL associated with the 107 * file, then write an error message to standard error and 108 * continue with the next file. 109 */ 110 warnx("%s: warning: no mask entry", filename); 111 acl_free(acl); 112 return (0); 113 } 114 115 acl_free(*prev_acl); 116 *prev_acl = acl_dup(acl); 117 acl_free(acl); 118 119 return (0); 120} 121