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 #include <sys/stat.h> 35 36 #include "acl_support.h" 37 38 /* 39 * These three routines from sys/kern/subr_acl_nfs4.c are used by both kernel 40 * and libc. 41 */ 42 void acl_nfs4_trivial_from_mode(struct acl *aclp, mode_t mode); 43 void acl_nfs4_sync_acl_from_mode(struct acl *aclp, mode_t mode, 44 int file_owner_id); 45 void acl_nfs4_sync_mode_from_acl(mode_t *_mode, const struct acl *aclp); 46 47 static acl_t 48 _nfs4_acl_strip_np(const acl_t aclp, int canonical_six) 49 { 50 acl_t newacl; 51 mode_t mode = 0; 52 53 newacl = acl_init(ACL_MAX_ENTRIES); 54 if (newacl == NULL) { 55 errno = ENOMEM; 56 return (NULL); 57 } 58 59 _acl_brand_as(newacl, ACL_BRAND_NFS4); 60 61 acl_nfs4_sync_mode_from_acl(&mode, &(aclp->ats_acl)); 62 if (canonical_six) 63 acl_nfs4_sync_acl_from_mode(&(newacl->ats_acl), mode, -1); 64 else 65 acl_nfs4_trivial_from_mode(&(newacl->ats_acl), mode); 66 67 return (newacl); 68 } 69 70 static acl_t 71 _posix1e_acl_strip_np(const acl_t aclp, int recalculate_mask) 72 { 73 acl_t acl_new, acl_old; 74 acl_entry_t entry, entry_new; 75 acl_permset_t perm; 76 acl_tag_t tag; 77 int entry_id, have_mask_entry; 78 79 assert(_acl_brand(aclp) == ACL_BRAND_POSIX); 80 81 acl_old = acl_dup(aclp); 82 if (acl_old == NULL) 83 return (NULL); 84 85 assert(_acl_brand(acl_old) == ACL_BRAND_POSIX); 86 87 have_mask_entry = 0; 88 acl_new = acl_init(ACL_MAX_ENTRIES); 89 if (acl_new == NULL) 90 return (NULL); 91 tag = ACL_UNDEFINED_TAG; 92 93 /* only save the default user/group/other entries */ 94 entry_id = ACL_FIRST_ENTRY; 95 while (acl_get_entry(acl_old, entry_id, &entry) == 1) { 96 entry_id = ACL_NEXT_ENTRY; 97 98 assert(_entry_brand(entry) == ACL_BRAND_POSIX); 99 100 if (acl_get_tag_type(entry, &tag) == -1) 101 return (NULL); 102 103 switch(tag) { 104 case ACL_USER_OBJ: 105 case ACL_GROUP_OBJ: 106 case ACL_OTHER: 107 if (acl_get_tag_type(entry, &tag) == -1) 108 return (NULL); 109 if (acl_get_permset(entry, &perm) == -1) 110 return (NULL); 111 if (acl_create_entry(&acl_new, &entry_new) == -1) 112 return (NULL); 113 if (acl_set_tag_type(entry_new, tag) == -1) 114 return (NULL); 115 if (acl_set_permset(entry_new, perm) == -1) 116 return (NULL); 117 if (acl_copy_entry(entry_new, entry) == -1) 118 return (NULL); 119 assert(_entry_brand(entry_new) == ACL_BRAND_POSIX); 120 break; 121 case ACL_MASK: 122 have_mask_entry = 1; 123 break; 124 default: 125 break; 126 } 127 } 128 129 assert(_acl_brand(acl_new) == ACL_BRAND_POSIX); 130 131 if (have_mask_entry && recalculate_mask) { 132 if (acl_calc_mask(&acl_new) == -1) 133 return (NULL); 134 } 135 136 return (acl_new); 137 } 138 139 acl_t 140 acl_strip_np(const acl_t aclp, int recalculate_mask) 141 { 142 switch (_acl_brand(aclp)) { 143 case ACL_BRAND_NFS4: 144 return (_nfs4_acl_strip_np(aclp, 1)); 145 146 case ACL_BRAND_POSIX: 147 return (_posix1e_acl_strip_np(aclp, recalculate_mask)); 148 149 default: 150 errno = EINVAL; 151 return (NULL); 152 } 153 } 154 155 /* 156 * Return 1, if ACL is trivial, 0 otherwise. 157 * 158 * ACL is trivial, iff its meaning could be fully expressed using just file 159 * mode. In other words, ACL is trivial iff it doesn't have "+" to the right 160 * of the mode bits in "ls -l" output ;-) 161 */ 162 int 163 acl_is_trivial_np(const acl_t aclp, int *trivialp) 164 { 165 acl_t tmpacl; 166 int differs; 167 168 if (aclp == NULL || trivialp == NULL) { 169 errno = EINVAL; 170 return (-1); 171 } 172 173 switch (_acl_brand(aclp)) { 174 case ACL_BRAND_POSIX: 175 if (aclp->ats_acl.acl_cnt == 3) 176 *trivialp = 1; 177 else 178 *trivialp = 0; 179 180 return (0); 181 182 case ACL_BRAND_NFS4: 183 /* 184 * If the ACL has more than canonical six entries, 185 * it's non trivial by definition. 186 */ 187 if (aclp->ats_acl.acl_cnt > 6) { 188 *trivialp = 0; 189 return (0); 190 } 191 192 /* 193 * Calculate trivial ACL - using acl_strip_np(3) - and compare 194 * with the original. 195 */ 196 tmpacl = _nfs4_acl_strip_np(aclp, 0); 197 if (tmpacl == NULL) 198 return (-1); 199 200 differs = _acl_differs(aclp, tmpacl); 201 acl_free(tmpacl); 202 203 if (differs == 0) { 204 *trivialp = 1; 205 return (0); 206 } 207 208 /* 209 * Try again with an old-style, "canonical six" trivial ACL. 210 */ 211 tmpacl = _nfs4_acl_strip_np(aclp, 1); 212 if (tmpacl == NULL) 213 return (-1); 214 215 differs = _acl_differs(aclp, tmpacl); 216 acl_free(tmpacl); 217 218 if (differs) 219 *trivialp = 0; 220 else 221 *trivialp = 1; 222 223 return (0); 224 225 default: 226 errno = EINVAL; 227 return (-1); 228 } 229 } 230