1 /* copy-acl.c - copy access control list from one file to another file
3 Copyright (C) 2002-2003, 2005-2008 Free Software Foundation, Inc.
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.
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.
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/>.
18 Written by Paul Eggert and Andreas Gruenbacher. */
24 #include "acl-internal.h"
27 /* Copy access control lists from one file to another. If SOURCE_DESC is
28 a valid file descriptor, use file descriptor operations, else use
29 filename based operations on SRC_NAME. Likewise for DEST_DESC and
31 If access control lists are not available, fchmod the target file to
32 MODE. Also sets the non-permission bits of the destination file
33 (S_ISUID, S_ISGID, S_ISVTX) to those from MODE if any are set.
34 Return 0 if successful.
35 Return -2 and set errno for an error relating to the source file.
36 Return -1 and set errno for an error relating to the destination file. */
39 qcopy_acl (const char *src_name, int source_desc, const char *dst_name,
40 int dest_desc, mode_t mode)
42 #if USE_ACL && HAVE_ACL_GET_FILE
43 /* POSIX 1003.1e (draft 17 -- abandoned) specific version. */
44 /* Linux, FreeBSD, MacOS X, IRIX, Tru64 */
46 /* Linux, FreeBSD, IRIX, Tru64 */
51 if (HAVE_ACL_GET_FD && source_desc != -1)
52 acl = acl_get_fd (source_desc);
54 acl = acl_get_file (src_name, ACL_TYPE_ACCESS);
57 if (ACL_NOT_WELL_SUPPORTED (errno))
58 return qset_acl (dst_name, dest_desc, mode);
63 if (HAVE_ACL_SET_FD && dest_desc != -1)
64 ret = acl_set_fd (dest_desc, acl);
66 ret = acl_set_file (dst_name, ACL_TYPE_ACCESS, acl);
69 int saved_errno = errno;
71 if (ACL_NOT_WELL_SUPPORTED (errno) && !acl_access_nontrivial (acl))
74 return chmod_or_fchmod (dst_name, dest_desc, mode);
79 chmod_or_fchmod (dst_name, dest_desc, mode);
87 if (mode & (S_ISUID | S_ISGID | S_ISVTX))
89 /* We did not call chmod so far, and either the mode and the ACL are
90 separate or special bits are to be set which don't fit into ACLs. */
92 if (chmod_or_fchmod (dst_name, dest_desc, mode) != 0)
98 acl = acl_get_file (src_name, ACL_TYPE_DEFAULT);
102 if (acl_set_file (dst_name, ACL_TYPE_DEFAULT, acl))
104 int saved_errno = errno;
115 # else /* !MODE_INSIDE_ACL */
118 # if !HAVE_ACL_TYPE_EXTENDED
119 # error Must have ACL_TYPE_EXTENDED
122 /* On MacOS X, acl_get_file (name, ACL_TYPE_ACCESS)
123 and acl_get_file (name, ACL_TYPE_DEFAULT)
124 always return NULL / EINVAL. You have to use
125 acl_get_file (name, ACL_TYPE_EXTENDED)
126 or acl_get_fd (open (name, ...))
129 acl_set_file (name, ACL_TYPE_ACCESS, acl)
130 and acl_set_file (name, ACL_TYPE_DEFAULT, acl)
131 have the same effect as
132 acl_set_file (name, ACL_TYPE_EXTENDED, acl):
133 Each of these calls sets the file's ACL. */
138 if (HAVE_ACL_GET_FD && source_desc != -1)
139 acl = acl_get_fd (source_desc);
141 acl = acl_get_file (src_name, ACL_TYPE_EXTENDED);
144 if (ACL_NOT_WELL_SUPPORTED (errno))
145 return qset_acl (dst_name, dest_desc, mode);
150 if (HAVE_ACL_SET_FD && dest_desc != -1)
151 ret = acl_set_fd (dest_desc, acl);
153 ret = acl_set_file (dst_name, ACL_TYPE_EXTENDED, acl);
156 int saved_errno = errno;
158 if (ACL_NOT_WELL_SUPPORTED (errno) && !acl_extended_nontrivial (acl))
161 return chmod_or_fchmod (dst_name, dest_desc, mode);
166 chmod_or_fchmod (dst_name, dest_desc, mode);
174 /* Since !MODE_INSIDE_ACL, we have to call chmod explicitly. */
175 return chmod_or_fchmod (dst_name, dest_desc, mode);
179 #elif USE_ACL && defined GETACL /* Solaris, Cygwin, not HP-UX */
181 # if defined ACL_NO_TRIVIAL
182 /* Solaris 10 (newer version), which has additional API declared in
183 <sys/acl.h> (acl_t) and implemented in libsec (acl_set, acl_trivial,
184 acl_fromtext, ...). */
188 ret = (source_desc < 0
189 ? acl_get (src_name, ACL_NO_TRIVIAL, &aclp)
190 : facl_get (source_desc, ACL_NO_TRIVIAL, &aclp));
191 if (ret != 0 && errno != ENOSYS)
194 ret = qset_acl (dst_name, dest_desc, mode);
201 ? acl_set (dst_name, aclp)
202 : facl_set (dest_desc, aclp));
205 int saved_errno = errno;
216 # else /* Solaris, Cygwin, general case */
218 /* Solaris 2.5 through Solaris 10, Cygwin, and contemporaneous versions
219 of Unixware. The acl() call returns the access and default ACL both
232 /* Solaris also has a different variant of ACLs, used in ZFS and NFSv4
233 file systems (whereas the other ones are used in UFS file systems).
235 pathconf (name, _PC_ACL_ENABLED)
236 fpathconf (desc, _PC_ACL_ENABLED)
237 that allows to determine which of the two kinds of ACLs is supported
238 for the given file. But some file systems may implement this call
239 incorrectly, so better not use it.
240 When fetching the source ACL, we simply fetch both ACL types.
241 When setting the destination ACL, we try either ACL types, assuming
242 that the kernel will translate the ACL from one form to the other.
243 (See in <http://docs.sun.com/app/docs/doc/819-2241/6n4huc7ia?l=en&a=view>
244 the description of ENOTSUP.) */
247 ace_count = (source_desc != -1
248 ? facl (source_desc, ACE_GETACLCNT, 0, NULL)
249 : acl (src_name, ACE_GETACLCNT, 0, NULL));
253 if (errno == ENOSYS || errno == EINVAL)
269 ace_entries = (ace_t *) malloc (ace_count * sizeof (ace_t));
270 if (ace_entries == NULL)
276 if ((source_desc != -1
277 ? facl (source_desc, ACE_GETACL, ace_count, ace_entries)
278 : acl (src_name, ACE_GETACL, ace_count, ace_entries))
281 /* Huh? The number of ACL entries changed since the last call.
288 count = (source_desc != -1
289 ? facl (source_desc, GETACLCNT, 0, NULL)
290 : acl (src_name, GETACLCNT, 0, NULL));
294 if (errno == ENOSYS || errno == ENOTSUP)
310 entries = (aclent_t *) malloc (count * sizeof (aclent_t));
317 if ((source_desc != -1
318 ? facl (source_desc, GETACL, count, entries)
319 : acl (src_name, GETACL, count, entries))
322 /* Huh? The number of ACL entries changed since the last call.
326 /* Is there an ACL of either kind? */
331 return qset_acl (dst_name, dest_desc, mode);
333 did_chmod = 0; /* set to 1 once the mode bits in 0777 have been set,
334 set to 2 once the mode bits other than 0777 have been set */
335 saved_errno = 0; /* the first non-ignorable error code */
337 /* If both ace_entries and entries are available, try SETACL before
338 ACE_SETACL, because SETACL cannot fail with ENOTSUP whereas ACE_SETACL
343 ret = (dest_desc != -1
344 ? facl (dest_desc, SETACL, count, entries)
345 : acl (dst_name, SETACL, count, entries));
349 if (errno == ENOSYS && !acl_nontrivial (count, entries))
360 ret = (dest_desc != -1
361 ? facl (dest_desc, ACE_SETACL, ace_count, ace_entries)
362 : acl (dst_name, ACE_SETACL, ace_count, ace_entries));
363 if (ret < 0 && saved_errno == 0)
366 if ((errno == ENOSYS || errno == EINVAL || errno == ENOTSUP)
367 && !acl_ace_nontrivial (ace_count, ace_entries))
374 if (did_chmod <= ((mode & (S_ISUID | S_ISGID | S_ISVTX)) ? 1 : 0))
376 /* We did not call chmod so far, and either the mode and the ACL are
377 separate or special bits are to be set which don't fit into ACLs. */
379 if (chmod_or_fchmod (dst_name, dest_desc, mode) != 0)
381 if (saved_errno == 0)
397 return qset_acl (dst_name, dest_desc, mode);
403 /* Copy access control lists from one file to another. If SOURCE_DESC is
404 a valid file descriptor, use file descriptor operations, else use
405 filename based operations on SRC_NAME. Likewise for DEST_DESC and
407 If access control lists are not available, fchmod the target file to
408 MODE. Also sets the non-permission bits of the destination file
409 (S_ISUID, S_ISGID, S_ISVTX) to those from MODE if any are set.
410 Return 0 if successful, otherwise output a diagnostic and return -1. */
413 copy_acl (const char *src_name, int source_desc, const char *dst_name,
414 int dest_desc, mode_t mode)
416 int ret = qcopy_acl (src_name, source_desc, dst_name, dest_desc, mode);
420 error (0, errno, "%s", quote (src_name));
424 error (0, errno, _("preserving permissions for %s"), quote (dst_name));