1 /* 2 * Copyright (c) 2001-2002 Chris D. Faulhaber 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27 #include <sys/cdefs.h> 28 __FBSDID("$FreeBSD$"); 29 30 #include <sys/types.h> 31 #include "namespace.h" 32 #include <sys/acl.h> 33 #include "un-namespace.h" 34 #include <errno.h> 35 #include <string.h> 36 #include <stdio.h> 37 38 #include "acl_support.h" 39 40 static int 41 _entry_matches(const acl_entry_t a, const acl_entry_t b) 42 { 43 /* 44 * There is a semantical difference here between NFSv4 and POSIX 45 * draft ACLs. In POSIX, there may be only one entry for the particular 46 * user or group. In NFSv4 ACL, there may be any number of them. We're 47 * trying to be more specific here in that case. 48 */ 49 switch (_entry_brand(a)) { 50 case ACL_BRAND_NFS4: 51 if (a->ae_tag != b->ae_tag || a->ae_entry_type != b->ae_entry_type) 52 return (0); 53 54 /* If ae_ids matter, compare them as well. */ 55 if (a->ae_tag == ACL_USER || a->ae_tag == ACL_GROUP) { 56 if (a->ae_id != b->ae_id) 57 return (0); 58 } 59 60 return (1); 61 62 default: 63 if ((a->ae_tag == b->ae_tag) && (a->ae_id == b->ae_id)) 64 return (1); 65 } 66 67 return (0); 68 } 69 70 /* 71 * acl_delete_entry() (23.4.9): remove the ACL entry indicated by entry_d 72 * from acl. 73 */ 74 int 75 acl_delete_entry(acl_t acl, acl_entry_t entry_d) 76 { 77 struct acl *acl_int; 78 struct acl_entry entry_int; 79 int i, j, found = 0; 80 81 if (acl == NULL || entry_d == NULL) { 82 errno = EINVAL; 83 return (-1); 84 } 85 86 acl_int = &acl->ats_acl; 87 88 if (_entry_brand(entry_d) != _acl_brand(acl)) { 89 errno = EINVAL; 90 return (-1); 91 } 92 93 if ((acl->ats_acl.acl_cnt < 1) || 94 (acl->ats_acl.acl_cnt > ACL_MAX_ENTRIES)) { 95 errno = EINVAL; 96 return (-1); 97 } 98 99 /* Use a local copy to prevent deletion of more than this entry */ 100 entry_int = *entry_d; 101 102 for (i = 0; i < acl->ats_acl.acl_cnt;) { 103 if (_entry_matches(&(acl->ats_acl.acl_entry[i]), &entry_int)) { 104 /* ...shift the remaining entries... */ 105 for (j = i; j < acl->ats_acl.acl_cnt - 1; ++j) 106 acl->ats_acl.acl_entry[j] = 107 acl->ats_acl.acl_entry[j+1]; 108 /* ...drop the count and zero the unused entry... */ 109 acl->ats_acl.acl_cnt--; 110 bzero(&acl->ats_acl.acl_entry[j], 111 sizeof(struct acl_entry)); 112 acl->ats_cur_entry = 0; 113 114 /* Continue with the loop to remove all matching entries. */ 115 found = 1; 116 } else 117 i++; 118 } 119 120 if (found) 121 return (0); 122 123 errno = EINVAL; 124 return (-1); 125 } 126 127 int 128 acl_delete_entry_np(acl_t acl, int offset) 129 { 130 struct acl *acl_int; 131 int i; 132 133 if (acl == NULL) { 134 errno = EINVAL; 135 return (-1); 136 } 137 138 acl_int = &acl->ats_acl; 139 140 if (offset < 0 || offset >= acl_int->acl_cnt) { 141 errno = EINVAL; 142 return (-1); 143 } 144 145 if ((acl->ats_acl.acl_cnt < 1) || 146 (acl->ats_acl.acl_cnt > ACL_MAX_ENTRIES)) { 147 errno = EINVAL; 148 return (-1); 149 } 150 151 /* ...shift the remaining entries... */ 152 for (i = offset; i < acl->ats_acl.acl_cnt - 1; ++i) 153 acl->ats_acl.acl_entry[i] = 154 acl->ats_acl.acl_entry[i+1]; 155 /* ...drop the count and zero the unused entry... */ 156 acl->ats_acl.acl_cnt--; 157 bzero(&acl->ats_acl.acl_entry[i], 158 sizeof(struct acl_entry)); 159 acl->ats_cur_entry = 0; 160 161 return (0); 162 } 163