1 /*- 2 * Copyright (c) 2001 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 <errno.h> 31 #include <stdio.h> 32 #include <assert.h> 33 #include <sys/acl.h> 34 35 #include "acl_support.h" 36 37 /* 38 * These two routines from sys/kern/subr_acl_nfs4.c are used by both kernel 39 * and libc. 40 */ 41 void acl_nfs4_sync_acl_from_mode(struct acl *aclp, mode_t mode, 42 int file_owner_id); 43 void acl_nfs4_sync_mode_from_acl(mode_t *_mode, const struct acl *aclp); 44 45 static acl_t 46 _nfs4_acl_strip_np(const acl_t aclp, int recalculate_mask) 47 { 48 acl_t newacl; 49 mode_t mode; 50 51 newacl = acl_init(ACL_MAX_ENTRIES); 52 if (newacl == NULL) { 53 errno = ENOMEM; 54 return (NULL); 55 } 56 57 _acl_brand_as(newacl, ACL_BRAND_NFS4); 58 59 acl_nfs4_sync_mode_from_acl(&mode, &(aclp->ats_acl)); 60 acl_nfs4_sync_acl_from_mode(&(newacl->ats_acl), mode, -1); 61 62 return (newacl); 63 } 64 65 static acl_t 66 _posix1e_acl_strip_np(const acl_t aclp, int recalculate_mask) 67 { 68 acl_t acl_new, acl_old; 69 acl_entry_t entry, entry_new; 70 acl_permset_t perm; 71 acl_tag_t tag; 72 int entry_id, have_mask_entry; 73 74 assert(_acl_brand(aclp) == ACL_BRAND_POSIX); 75 76 acl_old = acl_dup(aclp); 77 if (acl_old == NULL) 78 return (NULL); 79 80 assert(_acl_brand(acl_old) == ACL_BRAND_POSIX); 81 82 have_mask_entry = 0; 83 acl_new = acl_init(ACL_MAX_ENTRIES); 84 if (acl_new == NULL) 85 return (NULL); 86 tag = ACL_UNDEFINED_TAG; 87 88 /* only save the default user/group/other entries */ 89 entry_id = ACL_FIRST_ENTRY; 90 while (acl_get_entry(acl_old, entry_id, &entry) == 1) { 91 entry_id = ACL_NEXT_ENTRY; 92 93 assert(_entry_brand(entry) == ACL_BRAND_POSIX); 94 95 if (acl_get_tag_type(entry, &tag) == -1) 96 return (NULL); 97 98 switch(tag) { 99 case ACL_USER_OBJ: 100 case ACL_GROUP_OBJ: 101 case ACL_OTHER: 102 if (acl_get_tag_type(entry, &tag) == -1) 103 return (NULL); 104 if (acl_get_permset(entry, &perm) == -1) 105 return (NULL); 106 if (acl_create_entry(&acl_new, &entry_new) == -1) 107 return (NULL); 108 if (acl_set_tag_type(entry_new, tag) == -1) 109 return (NULL); 110 if (acl_set_permset(entry_new, perm) == -1) 111 return (NULL); 112 if (acl_copy_entry(entry_new, entry) == -1) 113 return (NULL); 114 assert(_entry_brand(entry_new) == ACL_BRAND_POSIX); 115 break; 116 case ACL_MASK: 117 have_mask_entry = 1; 118 break; 119 default: 120 break; 121 } 122 } 123 124 assert(_acl_brand(acl_new) == ACL_BRAND_POSIX); 125 126 if (have_mask_entry && recalculate_mask) { 127 if (acl_calc_mask(&acl_new) == -1) 128 return (NULL); 129 } 130 131 return (acl_new); 132 } 133 134 acl_t 135 acl_strip_np(const acl_t aclp, int recalculate_mask) 136 { 137 switch (_acl_brand(aclp)) { 138 case ACL_BRAND_NFS4: 139 return (_nfs4_acl_strip_np(aclp, recalculate_mask)); 140 141 case ACL_BRAND_POSIX: 142 return (_posix1e_acl_strip_np(aclp, recalculate_mask)); 143 144 default: 145 errno = EINVAL; 146 return (NULL); 147 } 148 } 149 150 /* 151 * Return 1, if ACL is trivial, 0 otherwise. 152 * 153 * ACL is trivial, iff its meaning could be fully expressed using just file 154 * mode. In other words, ACL is trivial iff it doesn't have "+" to the right 155 * of the mode bits in "ls -l" output ;-) 156 */ 157 int 158 acl_is_trivial_np(const acl_t aclp, int *trivialp) 159 { 160 acl_t tmpacl; 161 int differs; 162 163 if (aclp == NULL || trivialp == NULL) { 164 errno = EINVAL; 165 return (-1); 166 } 167 168 switch (_acl_brand(aclp)) { 169 case ACL_BRAND_POSIX: 170 if (aclp->ats_acl.acl_cnt == 3) 171 *trivialp = 1; 172 else 173 *trivialp = 0; 174 175 return (0); 176 177 case ACL_BRAND_NFS4: 178 /* 179 * Calculate trivial ACL - using acl_strip_np - and compare 180 * with the original. 181 */ 182 tmpacl = acl_strip_np(aclp, 0); 183 if (tmpacl == NULL) 184 return (-1); 185 186 differs = _acl_differs(aclp, tmpacl); 187 acl_free(tmpacl); 188 189 if (differs) 190 *trivialp = 0; 191 else 192 *trivialp = 1; 193 194 return (0); 195 196 default: 197 errno = EINVAL; 198 return (-1); 199 } 200 } 201