1 /* set-mode-acl.c - set access control list equivalent to a mode
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, and Bruno Haible. */
24 #include "acl-internal.h"
27 #define _(msgid) gettext (msgid)
30 /* If DESC is a valid file descriptor use fchmod to change the
31 file's mode to MODE on systems that have fchown. On systems
32 that don't have fchown and if DESC is invalid, use chown on
34 Return 0 if successful. Return -1 and set errno upon failure. */
37 chmod_or_fchmod (const char *name, int desc, mode_t mode)
39 if (HAVE_FCHMOD && desc != -1)
40 return fchmod (desc, mode);
42 return chmod (name, mode);
45 /* Set the access control lists of a file. If DESC is a valid file
46 descriptor, use file descriptor operations where available, else use
47 filename based operations on NAME. If access control lists are not
48 available, fchmod the target file to MODE. Also sets the
49 non-permission bits of the destination file (S_ISUID, S_ISGID, S_ISVTX)
50 to those from MODE if any are set.
51 Return 0 if successful. Return -1 and set errno upon failure. */
54 qset_acl (char const *name, int desc, mode_t mode)
57 # if HAVE_ACL_GET_FILE
58 /* POSIX 1003.1e draft 17 (abandoned) specific version. */
59 /* Linux, FreeBSD, MacOS X, IRIX, Tru64 */
61 /* Linux, FreeBSD, IRIX, Tru64 */
63 /* We must also have acl_from_text and acl_delete_def_file.
64 (acl_delete_def_file could be emulated with acl_init followed
65 by acl_set_file, but acl_set_file with an empty acl is
68 # ifndef HAVE_ACL_FROM_TEXT
69 # error Must have acl_from_text (see POSIX 1003.1e draft 17).
71 # ifndef HAVE_ACL_DELETE_DEF_FILE
72 # error Must have acl_delete_def_file (see POSIX 1003.1e draft 17).
78 if (HAVE_ACL_FROM_MODE) /* Linux */
80 acl = acl_from_mode (mode);
84 else /* FreeBSD, IRIX, Tru64 */
86 /* If we were to create the ACL using the functions acl_init(),
87 acl_create_entry(), acl_set_tag_type(), acl_set_qualifier(),
88 acl_get_permset(), acl_clear_perm[s](), acl_add_perm(), we
89 would need to create a qualifier. I don't know how to do this.
90 So create it using acl_from_text(). */
92 # if HAVE_ACL_FREE_TEXT /* Tru64 */
93 char acl_text[] = "u::---,g::---,o::---,";
94 # else /* FreeBSD, IRIX */
95 char acl_text[] = "u::---,g::---,o::---";
98 if (mode & S_IRUSR) acl_text[ 3] = 'r';
99 if (mode & S_IWUSR) acl_text[ 4] = 'w';
100 if (mode & S_IXUSR) acl_text[ 5] = 'x';
101 if (mode & S_IRGRP) acl_text[10] = 'r';
102 if (mode & S_IWGRP) acl_text[11] = 'w';
103 if (mode & S_IXGRP) acl_text[12] = 'x';
104 if (mode & S_IROTH) acl_text[17] = 'r';
105 if (mode & S_IWOTH) acl_text[18] = 'w';
106 if (mode & S_IXOTH) acl_text[19] = 'x';
108 acl = acl_from_text (acl_text);
112 if (HAVE_ACL_SET_FD && desc != -1)
113 ret = acl_set_fd (desc, acl);
115 ret = acl_set_file (name, ACL_TYPE_ACCESS, acl);
118 int saved_errno = errno;
121 if (ACL_NOT_WELL_SUPPORTED (errno))
122 return chmod_or_fchmod (name, desc, mode);
132 if (S_ISDIR (mode) && acl_delete_def_file (name))
135 if (mode & (S_ISUID | S_ISGID | S_ISVTX))
137 /* We did not call chmod so far, so the special bits have not yet
139 return chmod_or_fchmod (name, desc, mode);
143 # else /* !MODE_INSIDE_ACL */
146 # if !HAVE_ACL_TYPE_EXTENDED
147 # error Must have ACL_TYPE_EXTENDED
150 /* On MacOS X, acl_get_file (name, ACL_TYPE_ACCESS)
151 and acl_get_file (name, ACL_TYPE_DEFAULT)
152 always return NULL / EINVAL. You have to use
153 acl_get_file (name, ACL_TYPE_EXTENDED)
154 or acl_get_fd (open (name, ...))
157 acl_set_file (name, ACL_TYPE_ACCESS, acl)
158 and acl_set_file (name, ACL_TYPE_DEFAULT, acl)
159 have the same effect as
160 acl_set_file (name, ACL_TYPE_EXTENDED, acl):
161 Each of these calls sets the file's ACL. */
166 /* Remove the ACL if the file has ACLs. */
167 if (HAVE_ACL_GET_FD && desc != -1)
168 acl = acl_get_fd (desc);
170 acl = acl_get_file (name, ACL_TYPE_EXTENDED);
178 if (HAVE_ACL_SET_FD && desc != -1)
179 ret = acl_set_fd (desc, acl);
181 ret = acl_set_file (name, ACL_TYPE_EXTENDED, acl);
184 int saved_errno = errno;
188 if (ACL_NOT_WELL_SUPPORTED (saved_errno))
189 return chmod_or_fchmod (name, desc, mode);
200 /* Since !MODE_INSIDE_ACL, we have to call chmod explicitly. */
201 return chmod_or_fchmod (name, desc, mode);
204 # elif HAVE_ACL && defined GETACLCNT /* Solaris, Cygwin, not HP-UX */
206 # if defined ACL_NO_TRIVIAL
207 /* Solaris 10 (newer version), which has additional API declared in
208 <sys/acl.h> (acl_t) and implemented in libsec (acl_set, acl_trivial,
209 acl_fromtext, ...). */
212 char acl_text[] = "user::---,group::---,mask:---,other:---";
216 if (mode & S_IRUSR) acl_text[ 6] = 'r';
217 if (mode & S_IWUSR) acl_text[ 7] = 'w';
218 if (mode & S_IXUSR) acl_text[ 8] = 'x';
219 if (mode & S_IRGRP) acl_text[17] = acl_text[26] = 'r';
220 if (mode & S_IWGRP) acl_text[18] = acl_text[27] = 'w';
221 if (mode & S_IXGRP) acl_text[19] = acl_text[28] = 'x';
222 if (mode & S_IROTH) acl_text[36] = 'r';
223 if (mode & S_IWOTH) acl_text[37] = 'w';
224 if (mode & S_IXOTH) acl_text[38] = 'x';
226 if (acl_fromtext (acl_text, &aclp) != 0)
232 ret = (desc < 0 ? acl_set (name, aclp) : facl_set (desc, aclp));
237 if (saved_errno == ENOSYS)
238 return chmod_or_fchmod (name, desc, mode);
243 if (mode & (S_ISUID | S_ISGID | S_ISVTX))
245 /* We did not call chmod so far, so the special bits have not yet
247 return chmod_or_fchmod (name, desc, mode);
251 # else /* Solaris, Cygwin, general case */
254 /* Solaris also has a different variant of ACLs, used in ZFS and NFSv4
255 file systems (whereas the other ones are used in UFS file systems). */
257 /* The flags in the ace_t structure changed in a binary incompatible way
258 when ACL_NO_TRIVIAL etc. were introduced in <sys/acl.h> version 1.15.
259 How to distinguish the two conventions at runtime?
260 We fetch the existing ACL. In the old convention, usually three ACEs have
261 a_flags = ACE_OWNER / ACE_GROUP / ACE_OTHER, in the range 0x0100..0x0400.
262 In the new convention, these values are not used. */
272 count = facl (desc, ACE_GETACLCNT, 0, NULL);
274 count = acl (name, ACE_GETACLCNT, 0, NULL);
280 entries = (ace_t *) malloc (count * sizeof (ace_t));
287 ? facl (desc, ACE_GETACL, count, entries)
288 : acl (name, ACE_GETACL, count, entries))
294 for (i = 0; i < count; i++)
295 if (entries[i].a_flags & (ACE_OWNER | ACE_GROUP | ACE_OTHER))
303 /* Huh? The number of ACL entries changed since the last call.
316 /* Running on Solaris 10. */
317 entries[0].a_type = ALLOW;
318 entries[0].a_flags = ACE_OWNER;
319 entries[0].a_who = 0; /* irrelevant */
320 entries[0].a_access_mask = (mode >> 6) & 7;
321 entries[1].a_type = ALLOW;
322 entries[1].a_flags = ACE_GROUP;
323 entries[1].a_who = 0; /* irrelevant */
324 entries[1].a_access_mask = (mode >> 3) & 7;
325 entries[2].a_type = ALLOW;
326 entries[2].a_flags = ACE_OTHER;
327 entries[2].a_who = 0;
328 entries[2].a_access_mask = mode & 7;
332 /* Running on Solaris 10 (newer version) or Solaris 11. */
333 entries[0].a_type = ACE_ACCESS_ALLOWED_ACE_TYPE;
334 entries[0].a_flags = NEW_ACE_OWNER;
335 entries[0].a_who = 0; /* irrelevant */
336 entries[0].a_access_mask =
337 (mode & 0400 ? NEW_ACE_READ_DATA : 0)
338 | (mode & 0200 ? NEW_ACE_WRITE_DATA : 0)
339 | (mode & 0100 ? NEW_ACE_EXECUTE : 0);
340 entries[1].a_type = ACE_ACCESS_ALLOWED_ACE_TYPE;
341 entries[1].a_flags = NEW_ACE_GROUP | NEW_ACE_IDENTIFIER_GROUP;
342 entries[1].a_who = 0; /* irrelevant */
343 entries[1].a_access_mask =
344 (mode & 0040 ? NEW_ACE_READ_DATA : 0)
345 | (mode & 0020 ? NEW_ACE_WRITE_DATA : 0)
346 | (mode & 0010 ? NEW_ACE_EXECUTE : 0);
347 entries[2].a_type = ACE_ACCESS_ALLOWED_ACE_TYPE;
348 entries[2].a_flags = ACE_EVERYONE;
349 entries[2].a_who = 0;
350 entries[2].a_access_mask =
351 (mode & 0004 ? NEW_ACE_READ_DATA : 0)
352 | (mode & 0002 ? NEW_ACE_WRITE_DATA : 0)
353 | (mode & 0001 ? NEW_ACE_EXECUTE : 0);
356 ret = facl (desc, ACE_SETACL,
357 sizeof (entries) / sizeof (aclent_t), entries);
359 ret = acl (name, ACE_SETACL,
360 sizeof (entries) / sizeof (aclent_t), entries);
361 if (ret < 0 && errno != EINVAL && errno != ENOTSUP)
364 return chmod_or_fchmod (name, desc, mode);
374 entries[0].a_type = USER_OBJ;
375 entries[0].a_id = 0; /* irrelevant */
376 entries[0].a_perm = (mode >> 6) & 7;
377 entries[1].a_type = GROUP_OBJ;
378 entries[1].a_id = 0; /* irrelevant */
379 entries[1].a_perm = (mode >> 3) & 7;
380 entries[2].a_type = OTHER_OBJ;
382 entries[2].a_perm = mode & 7;
385 ret = facl (desc, SETACL, sizeof (entries) / sizeof (aclent_t), entries);
387 ret = acl (name, SETACL, sizeof (entries) / sizeof (aclent_t), entries);
391 return chmod_or_fchmod (name, desc, mode);
396 if (!MODE_INSIDE_ACL || (mode & (S_ISUID | S_ISGID | S_ISVTX)))
398 /* We did not call chmod so far, so the special bits have not yet
400 return chmod_or_fchmod (name, desc, mode);
406 # elif HAVE_GETACL /* HP-UX */
409 struct acl_entry entries[3];
413 ret = fstat (desc, &statbuf);
415 ret = stat (name, &statbuf);
419 entries[0].uid = statbuf.st_uid;
420 entries[0].gid = ACL_NSGROUP;
421 entries[0].mode = (mode >> 6) & 7;
422 entries[1].uid = ACL_NSUSER;
423 entries[1].gid = statbuf.st_gid;
424 entries[1].mode = (mode >> 3) & 7;
425 entries[2].uid = ACL_NSUSER;
426 entries[2].gid = ACL_NSGROUP;
427 entries[2].mode = mode & 7;
430 ret = fsetacl (desc, sizeof (entries) / sizeof (struct acl_entry), entries);
432 ret = setacl (name, sizeof (entries) / sizeof (struct acl_entry), entries);
435 if (errno == ENOSYS || errno == EOPNOTSUPP)
436 return chmod_or_fchmod (name, desc, mode);
440 if (mode & (S_ISUID | S_ISGID | S_ISVTX))
442 /* We did not call chmod so far, so the special bits have not yet
444 return chmod_or_fchmod (name, desc, mode);
448 # elif HAVE_ACLX_GET && 0 /* AIX */
450 /* TODO: use aclx_fput or aclx_put, respectively */
452 # elif HAVE_STATACL /* older AIX */
454 union { struct acl a; char room[128]; } u;
457 u.a.acl_len = (char *) &u.a.acl_ext[0] - (char *) &u.a; /* no entries */
458 u.a.acl_mode = mode & ~(S_IXACL | 0777);
459 u.a.u_access = (mode >> 6) & 7;
460 u.a.g_access = (mode >> 3) & 7;
461 u.a.o_access = mode & 7;
464 ret = fchacl (desc, &u.a, u.a.acl_len);
466 ret = chacl (name, &u.a, u.a.acl_len);
468 if (ret < 0 && errno == ENOSYS)
469 return chmod_or_fchmod (name, desc, mode);
473 # else /* Unknown flavor of ACLs */
474 return chmod_or_fchmod (name, desc, mode);
477 return chmod_or_fchmod (name, desc, mode);
481 /* As with qset_acl, but also output a diagnostic on failure. */
484 set_acl (char const *name, int desc, mode_t mode)
486 int r = qset_acl (name, desc, mode);
488 error (0, errno, _("setting permissions for %s"), quote (name));