| 1 | /* Internal implementation of access control lists. |
| 2 | |
| 3 | Copyright (C) 2002-2003, 2005-2014 Free Software Foundation, Inc. |
| 4 | |
| 5 | This program is free software: you can redistribute it and/or modify |
| 6 | it under the terms of the GNU General Public License as published by |
| 7 | the Free Software Foundation; either version 3 of the License, or |
| 8 | (at your option) any later version. |
| 9 | |
| 10 | This program is distributed in the hope that it will be useful, |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | GNU General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU General Public License |
| 16 | along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 17 | |
| 18 | Written by Paul Eggert, Andreas Grünbacher, and Bruno Haible. */ |
| 19 | |
| 20 | #include "acl.h" |
| 21 | |
| 22 | #include <stdbool.h> |
| 23 | #include <stdlib.h> |
| 24 | |
| 25 | /* All systems define the ACL related API in <sys/acl.h>. */ |
| 26 | #if HAVE_SYS_ACL_H |
| 27 | # include <sys/acl.h> |
| 28 | #endif |
| 29 | #if defined HAVE_FACL && ! defined GETACLCNT && defined ACL_CNT |
| 30 | # define GETACLCNT ACL_CNT |
| 31 | #endif |
| 32 | |
| 33 | /* On Linux, additional ACL related API is available in <acl/libacl.h>. */ |
| 34 | #ifdef HAVE_ACL_LIBACL_H |
| 35 | # include <acl/libacl.h> |
| 36 | #endif |
| 37 | |
| 38 | /* On HP-UX >= 11.11, additional ACL API is available in <aclv.h>. */ |
| 39 | #if HAVE_ACLV_H |
| 40 | # include <sys/types.h> |
| 41 | # include <aclv.h> |
| 42 | /* HP-UX 11.11 lacks these declarations. */ |
| 43 | extern int acl (char *, int, int, struct acl *); |
| 44 | extern int aclsort (int, int, struct acl *); |
| 45 | #endif |
| 46 | |
| 47 | #include <errno.h> |
| 48 | |
| 49 | #include <limits.h> |
| 50 | #ifndef MIN |
| 51 | # define MIN(a,b) ((a) < (b) ? (a) : (b)) |
| 52 | #endif |
| 53 | |
| 54 | #ifndef SIZE_MAX |
| 55 | # define SIZE_MAX ((size_t) -1) |
| 56 | #endif |
| 57 | |
| 58 | #ifndef HAVE_FCHMOD |
| 59 | # define HAVE_FCHMOD false |
| 60 | # define fchmod(fd, mode) (-1) |
| 61 | #endif |
| 62 | |
| 63 | #ifndef _GL_INLINE_HEADER_BEGIN |
| 64 | #error "Please include config.h first." |
| 65 | #endif |
| 66 | _GL_INLINE_HEADER_BEGIN |
| 67 | #ifndef ACL_INTERNAL_INLINE |
| 68 | # define ACL_INTERNAL_INLINE _GL_INLINE |
| 69 | #endif |
| 70 | |
| 71 | #if USE_ACL |
| 72 | |
| 73 | # if HAVE_ACL_GET_FILE |
| 74 | /* POSIX 1003.1e (draft 17 -- abandoned) specific version. */ |
| 75 | /* Linux, FreeBSD, Mac OS X, IRIX, Tru64 */ |
| 76 | |
| 77 | # ifndef MIN_ACL_ENTRIES |
| 78 | # define MIN_ACL_ENTRIES 4 |
| 79 | # endif |
| 80 | |
| 81 | /* POSIX 1003.1e (draft 17) */ |
| 82 | # ifdef HAVE_ACL_GET_FD |
| 83 | /* Most platforms have a 1-argument acl_get_fd, only OSF/1 has a 2-argument |
| 84 | macro(!). */ |
| 85 | # if HAVE_ACL_FREE_TEXT /* OSF/1 */ |
| 86 | ACL_INTERNAL_INLINE acl_t |
| 87 | rpl_acl_get_fd (int fd) |
| 88 | { |
| 89 | return acl_get_fd (fd, ACL_TYPE_ACCESS); |
| 90 | } |
| 91 | # undef acl_get_fd |
| 92 | # define acl_get_fd rpl_acl_get_fd |
| 93 | # endif |
| 94 | # else |
| 95 | # define HAVE_ACL_GET_FD false |
| 96 | # undef acl_get_fd |
| 97 | # define acl_get_fd(fd) (NULL) |
| 98 | # endif |
| 99 | |
| 100 | /* POSIX 1003.1e (draft 17) */ |
| 101 | # ifdef HAVE_ACL_SET_FD |
| 102 | /* Most platforms have a 2-argument acl_set_fd, only OSF/1 has a 3-argument |
| 103 | macro(!). */ |
| 104 | # if HAVE_ACL_FREE_TEXT /* OSF/1 */ |
| 105 | ACL_INTERNAL_INLINE int |
| 106 | rpl_acl_set_fd (int fd, acl_t acl) |
| 107 | { |
| 108 | return acl_set_fd (fd, ACL_TYPE_ACCESS, acl); |
| 109 | } |
| 110 | # undef acl_set_fd |
| 111 | # define acl_set_fd rpl_acl_set_fd |
| 112 | # endif |
| 113 | # else |
| 114 | # define HAVE_ACL_SET_FD false |
| 115 | # undef acl_set_fd |
| 116 | # define acl_set_fd(fd, acl) (-1) |
| 117 | # endif |
| 118 | |
| 119 | /* POSIX 1003.1e (draft 13) */ |
| 120 | # if ! HAVE_ACL_FREE_TEXT |
| 121 | # define acl_free_text(buf) acl_free (buf) |
| 122 | # endif |
| 123 | |
| 124 | /* Linux-specific */ |
| 125 | # ifndef HAVE_ACL_EXTENDED_FILE |
| 126 | # define HAVE_ACL_EXTENDED_FILE false |
| 127 | # define acl_extended_file(name) (-1) |
| 128 | # endif |
| 129 | |
| 130 | /* Linux-specific */ |
| 131 | # ifndef HAVE_ACL_FROM_MODE |
| 132 | # define HAVE_ACL_FROM_MODE false |
| 133 | # define acl_from_mode(mode) (NULL) |
| 134 | # endif |
| 135 | |
| 136 | /* Set to 1 if a file's mode is implicit by the ACL. |
| 137 | Set to 0 if a file's mode is stored independently from the ACL. */ |
| 138 | # if (HAVE_ACL_COPY_EXT_NATIVE && HAVE_ACL_CREATE_ENTRY_NP) || defined __sgi /* Mac OS X, IRIX */ |
| 139 | # define MODE_INSIDE_ACL 0 |
| 140 | # else |
| 141 | # define MODE_INSIDE_ACL 1 |
| 142 | # endif |
| 143 | |
| 144 | /* Return the number of entries in ACL. |
| 145 | Return -1 and set errno upon failure to determine it. */ |
| 146 | /* Define a replacement for acl_entries if needed. (Only Linux has it.) */ |
| 147 | # if !HAVE_ACL_ENTRIES |
| 148 | # define acl_entries rpl_acl_entries |
| 149 | extern int acl_entries (acl_t); |
| 150 | # endif |
| 151 | |
| 152 | # if HAVE_ACL_TYPE_EXTENDED /* Mac OS X */ |
| 153 | /* ACL is an ACL, from a file, stored as type ACL_TYPE_EXTENDED. |
| 154 | Return 1 if the given ACL is non-trivial. |
| 155 | Return 0 if it is trivial. */ |
| 156 | extern int acl_extended_nontrivial (acl_t); |
| 157 | # else |
| 158 | /* ACL is an ACL, from a file, stored as type ACL_TYPE_ACCESS. |
| 159 | Return 1 if the given ACL is non-trivial. |
| 160 | Return 0 if it is trivial, i.e. equivalent to a simple stat() mode. |
| 161 | Return -1 and set errno upon failure to determine it. */ |
| 162 | extern int acl_access_nontrivial (acl_t); |
| 163 | # endif |
| 164 | |
| 165 | # elif HAVE_FACL && defined GETACL /* Solaris, Cygwin, not HP-UX */ |
| 166 | |
| 167 | /* Set to 1 if a file's mode is implicit by the ACL. |
| 168 | Set to 0 if a file's mode is stored independently from the ACL. */ |
| 169 | # if defined __CYGWIN__ /* Cygwin */ |
| 170 | # define MODE_INSIDE_ACL 0 |
| 171 | # else /* Solaris */ |
| 172 | # define MODE_INSIDE_ACL 1 |
| 173 | # endif |
| 174 | |
| 175 | /* Return 1 if the given ACL is non-trivial. |
| 176 | Return 0 if it is trivial, i.e. equivalent to a simple stat() mode. */ |
| 177 | extern int acl_nontrivial (int count, aclent_t *entries) _GL_ATTRIBUTE_PURE; |
| 178 | |
| 179 | # ifdef ACE_GETACL /* Solaris 10 */ |
| 180 | |
| 181 | /* Test an ACL retrieved with ACE_GETACL. |
| 182 | Return 1 if the given ACL, consisting of COUNT entries, is non-trivial. |
| 183 | Return 0 if it is trivial, i.e. equivalent to a simple stat() mode. */ |
| 184 | extern int acl_ace_nontrivial (int count, ace_t *entries) _GL_ATTRIBUTE_PURE; |
| 185 | |
| 186 | /* Definitions for when the built executable is executed on Solaris 10 |
| 187 | (newer version) or Solaris 11. */ |
| 188 | /* For a_type. */ |
| 189 | # define OLD_ALLOW 0 |
| 190 | # define OLD_DENY 1 |
| 191 | # define NEW_ACE_ACCESS_ALLOWED_ACE_TYPE 0 /* replaces ALLOW */ |
| 192 | # define NEW_ACE_ACCESS_DENIED_ACE_TYPE 1 /* replaces DENY */ |
| 193 | /* For a_flags. */ |
| 194 | # define OLD_ACE_OWNER 0x0100 |
| 195 | # define OLD_ACE_GROUP 0x0200 |
| 196 | # define OLD_ACE_OTHER 0x0400 |
| 197 | # define NEW_ACE_OWNER 0x1000 |
| 198 | # define NEW_ACE_GROUP 0x2000 |
| 199 | # define NEW_ACE_IDENTIFIER_GROUP 0x0040 |
| 200 | # define NEW_ACE_EVERYONE 0x4000 |
| 201 | /* For a_access_mask. */ |
| 202 | # define NEW_ACE_READ_DATA 0x001 /* corresponds to 'r' */ |
| 203 | # define NEW_ACE_WRITE_DATA 0x002 /* corresponds to 'w' */ |
| 204 | # define NEW_ACE_APPEND_DATA 0x004 |
| 205 | # define NEW_ACE_READ_NAMED_ATTRS 0x008 |
| 206 | # define NEW_ACE_WRITE_NAMED_ATTRS 0x010 |
| 207 | # define NEW_ACE_EXECUTE 0x020 |
| 208 | # define NEW_ACE_DELETE_CHILD 0x040 |
| 209 | # define NEW_ACE_READ_ATTRIBUTES 0x080 |
| 210 | # define NEW_ACE_WRITE_ATTRIBUTES 0x100 |
| 211 | # define NEW_ACE_DELETE 0x10000 |
| 212 | # define NEW_ACE_READ_ACL 0x20000 |
| 213 | # define NEW_ACE_WRITE_ACL 0x40000 |
| 214 | # define NEW_ACE_WRITE_OWNER 0x80000 |
| 215 | # define NEW_ACE_SYNCHRONIZE 0x100000 |
| 216 | |
| 217 | # endif |
| 218 | |
| 219 | # elif HAVE_GETACL /* HP-UX */ |
| 220 | |
| 221 | /* Return 1 if the given ACL is non-trivial. |
| 222 | Return 0 if it is trivial, i.e. equivalent to a simple stat() mode. */ |
| 223 | extern int acl_nontrivial (int count, struct acl_entry *entries, struct stat *sb); |
| 224 | |
| 225 | # if HAVE_ACLV_H /* HP-UX >= 11.11 */ |
| 226 | |
| 227 | /* Return 1 if the given ACL is non-trivial. |
| 228 | Return 0 if it is trivial, i.e. equivalent to a simple stat() mode. */ |
| 229 | extern int aclv_nontrivial (int count, struct acl *entries); |
| 230 | |
| 231 | # endif |
| 232 | |
| 233 | # elif HAVE_ACLX_GET && 0 /* AIX */ |
| 234 | |
| 235 | /* TODO */ |
| 236 | |
| 237 | # elif HAVE_STATACL /* older AIX */ |
| 238 | |
| 239 | /* Return 1 if the given ACL is non-trivial. |
| 240 | Return 0 if it is trivial, i.e. equivalent to a simple stat() mode. */ |
| 241 | extern int acl_nontrivial (struct acl *a); |
| 242 | |
| 243 | # elif HAVE_ACLSORT /* NonStop Kernel */ |
| 244 | |
| 245 | /* Return 1 if the given ACL is non-trivial. |
| 246 | Return 0 if it is trivial, i.e. equivalent to a simple stat() mode. */ |
| 247 | extern int acl_nontrivial (int count, struct acl *entries); |
| 248 | |
| 249 | # endif |
| 250 | |
| 251 | #endif |
| 252 | |
| 253 | _GL_INLINE_HEADER_END |