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 routines from sys/kern/subr_acl_nfs4.c are used by both kernel 40 * and libc. 41 */ 42 void acl_nfs4_sync_mode_from_acl(mode_t *_mode, const struct acl *aclp); 43 void acl_nfs4_trivial_from_mode_libc(struct acl *aclp, int file_owner_id, 44 int canonical_six); 45 46 static acl_t 47 _nfs4_acl_strip_np(const acl_t aclp, int canonical_six) 48 { 49 acl_t newacl; 50 mode_t mode = 0; 51 52 newacl = acl_init(ACL_MAX_ENTRIES); 53 if (newacl == NULL) { 54 errno = ENOMEM; 55 return (NULL); 56 } 57 58 _acl_brand_as(newacl, ACL_BRAND_NFS4); 59 60 acl_nfs4_sync_mode_from_acl(&mode, &(aclp->ats_acl)); 61 acl_nfs4_trivial_from_mode_libc(&(newacl->ats_acl), mode, canonical_six); 62 63 return (newacl); 64 } 65 66 static acl_t 67 _posix1e_acl_strip_np(const acl_t aclp, int recalculate_mask) 68 { 69 acl_t acl_new, acl_old; 70 acl_entry_t entry, entry_new; 71 acl_permset_t perm; 72 acl_tag_t tag; 73 int entry_id, have_mask_entry; 74 75 assert(_acl_brand(aclp) == ACL_BRAND_POSIX); 76 77 acl_old = acl_dup(aclp); 78 if (acl_old == NULL) 79 return (NULL); 80 81 assert(_acl_brand(acl_old) == ACL_BRAND_POSIX); 82 83 have_mask_entry = 0; 84 acl_new = acl_init(ACL_MAX_ENTRIES); 85 if (acl_new == NULL) 86 return (NULL); 87 tag = ACL_UNDEFINED_TAG; 88 89 /* only save the default user/group/other entries */ 90 entry_id = ACL_FIRST_ENTRY; 91 while (acl_get_entry(acl_old, entry_id, &entry) == 1) { 92 entry_id = ACL_NEXT_ENTRY; 93 94 assert(_entry_brand(entry) == ACL_BRAND_POSIX); 95 96 if (acl_get_tag_type(entry, &tag) == -1) 97 return (NULL); 98 99 switch(tag) { 100 case ACL_USER_OBJ: 101 case ACL_GROUP_OBJ: 102 case ACL_OTHER: 103 if (acl_get_tag_type(entry, &tag) == -1) 104 return (NULL); 105 if (acl_get_permset(entry, &perm) == -1) 106 return (NULL); 107 if (acl_create_entry(&acl_new, &entry_new) == -1) 108 return (NULL); 109 if (acl_set_tag_type(entry_new, tag) == -1) 110 return (NULL); 111 if (acl_set_permset(entry_new, perm) == -1) 112 return (NULL); 113 if (acl_copy_entry(entry_new, entry) == -1) 114 return (NULL); 115 assert(_entry_brand(entry_new) == ACL_BRAND_POSIX); 116 break; 117 case ACL_MASK: 118 have_mask_entry = 1; 119 break; 120 default: 121 break; 122 } 123 } 124 125 assert(_acl_brand(acl_new) == ACL_BRAND_POSIX); 126 127 if (have_mask_entry && recalculate_mask) { 128 if (acl_calc_mask(&acl_new) == -1) 129 return (NULL); 130 } 131 132 return (acl_new); 133 } 134 135 acl_t 136 acl_strip_np(const acl_t aclp, int recalculate_mask) 137 { 138 switch (_acl_brand(aclp)) { 139 case ACL_BRAND_NFS4: 140 return (_nfs4_acl_strip_np(aclp, 0)); 141 142 case ACL_BRAND_POSIX: 143 return (_posix1e_acl_strip_np(aclp, recalculate_mask)); 144 145 default: 146 errno = EINVAL; 147 return (NULL); 148 } 149 } 150 151 /* 152 * Return 1, if ACL is trivial, 0 otherwise. 153 * 154 * ACL is trivial, iff its meaning could be fully expressed using just file 155 * mode. In other words, ACL is trivial iff it doesn't have "+" to the right 156 * of the mode bits in "ls -l" output ;-) 157 */ 158 int 159 acl_is_trivial_np(const acl_t aclp, int *trivialp) 160 { 161 acl_t tmpacl; 162 int differs; 163 164 if (aclp == NULL || trivialp == NULL) { 165 errno = EINVAL; 166 return (-1); 167 } 168 169 switch (_acl_brand(aclp)) { 170 case ACL_BRAND_POSIX: 171 if (aclp->ats_acl.acl_cnt == 3) 172 *trivialp = 1; 173 else 174 *trivialp = 0; 175 176 return (0); 177 178 case ACL_BRAND_NFS4: 179 /* 180 * If the ACL has more than canonical six entries, 181 * it's non trivial by definition. 182 */ 183 if (aclp->ats_acl.acl_cnt > 6) { 184 *trivialp = 0; 185 return (0); 186 } 187 188 /* 189 * Calculate trivial ACL - using acl_strip_np(3) - and compare 190 * with the original. 191 */ 192 tmpacl = _nfs4_acl_strip_np(aclp, 0); 193 if (tmpacl == NULL) 194 return (-1); 195 196 differs = _acl_differs(aclp, tmpacl); 197 acl_free(tmpacl); 198 199 if (differs == 0) { 200 *trivialp = 1; 201 return (0); 202 } 203 204 /* 205 * Try again with an old-style, "canonical six" trivial ACL. 206 */ 207 tmpacl = _nfs4_acl_strip_np(aclp, 1); 208 if (tmpacl == NULL) 209 return (-1); 210 211 differs = _acl_differs(aclp, tmpacl); 212 acl_free(tmpacl); 213 214 if (differs) 215 *trivialp = 0; 216 else 217 *trivialp = 1; 218 219 return (0); 220 221 default: 222 errno = EINVAL; 223 return (-1); 224 } 225 } 226