1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 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 __FBSDID("$FreeBSD$"); 31 32 #include <sys/types.h> 33 #include "namespace.h" 34 #include <sys/acl.h> 35 #include "un-namespace.h" 36 #include <errno.h> 37 #include <string.h> 38 #include <stdio.h> 39 40 #include "acl_support.h" 41 42 static int 43 _entry_matches(const acl_entry_t a, const acl_entry_t b) 44 { 45 /* 46 * There is a semantical difference here between NFSv4 and POSIX 47 * draft ACLs. In POSIX, there may be only one entry for the particular 48 * user or group. In NFSv4 ACL, there may be any number of them. We're 49 * trying to be more specific here in that case. 50 */ 51 switch (_entry_brand(a)) { 52 case ACL_BRAND_NFS4: 53 if (a->ae_tag != b->ae_tag || a->ae_entry_type != b->ae_entry_type) 54 return (0); 55 56 /* If ae_ids matter, compare them as well. */ 57 if (a->ae_tag == ACL_USER || a->ae_tag == ACL_GROUP) { 58 if (a->ae_id != b->ae_id) 59 return (0); 60 } 61 62 return (1); 63 64 default: 65 if ((a->ae_tag == b->ae_tag) && (a->ae_id == b->ae_id)) 66 return (1); 67 } 68 69 return (0); 70 } 71 72 /* 73 * acl_delete_entry() (23.4.9): remove the ACL entry indicated by entry_d 74 * from acl. 75 */ 76 int 77 acl_delete_entry(acl_t acl, acl_entry_t entry_d) 78 { 79 struct acl_entry entry_int; 80 int i, j, found = 0; 81 82 if (acl == NULL || entry_d == NULL) { 83 errno = EINVAL; 84 return (-1); 85 } 86 87 if (_entry_brand(entry_d) != _acl_brand(acl)) { 88 errno = EINVAL; 89 return (-1); 90 } 91 92 if ((acl->ats_acl.acl_cnt < 1) || 93 (acl->ats_acl.acl_cnt > ACL_MAX_ENTRIES)) { 94 errno = EINVAL; 95 return (-1); 96 } 97 98 /* Use a local copy to prevent deletion of more than this entry */ 99 entry_int = *entry_d; 100 101 for (i = 0; i < acl->ats_acl.acl_cnt;) { 102 if (_entry_matches(&(acl->ats_acl.acl_entry[i]), &entry_int)) { 103 /* ...shift the remaining entries... */ 104 for (j = i; j < acl->ats_acl.acl_cnt - 1; ++j) 105 acl->ats_acl.acl_entry[j] = 106 acl->ats_acl.acl_entry[j+1]; 107 /* ...drop the count and zero the unused entry... */ 108 acl->ats_acl.acl_cnt--; 109 bzero(&acl->ats_acl.acl_entry[j], 110 sizeof(struct acl_entry)); 111 acl->ats_cur_entry = 0; 112 113 /* Continue with the loop to remove all matching entries. */ 114 found = 1; 115 } else 116 i++; 117 } 118 119 if (found) 120 return (0); 121 122 errno = EINVAL; 123 return (-1); 124 } 125 126 int 127 acl_delete_entry_np(acl_t acl, int offset) 128 { 129 struct acl *acl_int; 130 int i; 131 132 if (acl == NULL) { 133 errno = EINVAL; 134 return (-1); 135 } 136 137 acl_int = &acl->ats_acl; 138 139 if (offset < 0 || offset >= acl_int->acl_cnt) { 140 errno = EINVAL; 141 return (-1); 142 } 143 144 if ((acl->ats_acl.acl_cnt < 1) || 145 (acl->ats_acl.acl_cnt > ACL_MAX_ENTRIES)) { 146 errno = EINVAL; 147 return (-1); 148 } 149 150 /* ...shift the remaining entries... */ 151 for (i = offset; i < acl->ats_acl.acl_cnt - 1; ++i) 152 acl->ats_acl.acl_entry[i] = 153 acl->ats_acl.acl_entry[i+1]; 154 /* ...drop the count and zero the unused entry... */ 155 acl->ats_acl.acl_cnt--; 156 bzero(&acl->ats_acl.acl_entry[i], 157 sizeof(struct acl_entry)); 158 acl->ats_cur_entry = 0; 159 160 return (0); 161 } 162