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. */
24 #include "acl-internal.h"
26 /* If DESC is a valid file descriptor use fchmod to change the
27 file's mode to MODE on systems that have fchown. On systems
28 that don't have fchown and if DESC is invalid, use chown on
32 chmod_or_fchmod (const char *name, int desc, mode_t mode)
34 if (HAVE_FCHMOD && desc != -1)
35 return fchmod (desc, mode);
37 return chmod (name, mode);
40 /* Set the access control lists of a file. If DESC is a valid file
41 descriptor, use file descriptor operations where available, else use
42 filename based operations on NAME. If access control lists are not
43 available, fchmod the target file to MODE. Also sets the
44 non-permission bits of the destination file (S_ISUID, S_ISGID, S_ISVTX)
45 to those from MODE if any are set.
46 Return 0 if successful. Return -1 and set errno upon failure. */
49 qset_acl (char const *name, int desc, mode_t mode)
52 # if HAVE_ACL_GET_FILE
53 /* POSIX 1003.1e draft 17 (abandoned) specific version. */
54 /* Linux, FreeBSD, MacOS X, IRIX, Tru64 */
56 /* Linux, FreeBSD, IRIX, Tru64 */
58 /* We must also have acl_from_text and acl_delete_def_file.
59 (acl_delete_def_file could be emulated with acl_init followed
60 by acl_set_file, but acl_set_file with an empty acl is
63 # ifndef HAVE_ACL_FROM_TEXT
64 # error Must have acl_from_text (see POSIX 1003.1e draft 17).
66 # ifndef HAVE_ACL_DELETE_DEF_FILE
67 # error Must have acl_delete_def_file (see POSIX 1003.1e draft 17).
73 if (HAVE_ACL_FROM_MODE) /* Linux */
75 acl = acl_from_mode (mode);
79 else /* FreeBSD, IRIX, Tru64 */
81 /* If we were to create the ACL using the functions acl_init(),
82 acl_create_entry(), acl_set_tag_type(), acl_set_qualifier(),
83 acl_get_permset(), acl_clear_perm[s](), acl_add_perm(), we
84 would need to create a qualifier. I don't know how to do this.
85 So create it using acl_from_text(). */
87 # if HAVE_ACL_FREE_TEXT /* Tru64 */
88 char acl_text[] = "u::---,g::---,o::---,";
89 # else /* FreeBSD, IRIX */
90 char acl_text[] = "u::---,g::---,o::---";
93 if (mode & S_IRUSR) acl_text[ 3] = 'r';
94 if (mode & S_IWUSR) acl_text[ 4] = 'w';
95 if (mode & S_IXUSR) acl_text[ 5] = 'x';
96 if (mode & S_IRGRP) acl_text[10] = 'r';
97 if (mode & S_IWGRP) acl_text[11] = 'w';
98 if (mode & S_IXGRP) acl_text[12] = 'x';
99 if (mode & S_IROTH) acl_text[17] = 'r';
100 if (mode & S_IWOTH) acl_text[18] = 'w';
101 if (mode & S_IXOTH) acl_text[19] = 'x';
103 acl = acl_from_text (acl_text);
107 if (HAVE_ACL_SET_FD && desc != -1)
108 ret = acl_set_fd (desc, acl);
110 ret = acl_set_file (name, ACL_TYPE_ACCESS, acl);
113 int saved_errno = errno;
116 if (ACL_NOT_WELL_SUPPORTED (errno))
118 if (chmod_or_fchmod (name, desc, mode) != 0)
129 if (S_ISDIR (mode) && acl_delete_def_file (name))
132 if (mode & (S_ISUID | S_ISGID | S_ISVTX))
134 /* We did not call chmod so far, so the special bits have not yet
137 if (chmod_or_fchmod (name, desc, mode))
142 # else /* !MODE_INSIDE_ACL */
148 /* Remove the ACL if the file has ACLs. */
149 if (HAVE_ACL_GET_FD && desc != -1)
150 acl = acl_get_fd (desc);
152 acl = acl_get_file (name, ACL_TYPE_ACCESS);
155 # if HAVE_ACL_COPY_EXT_NATIVE && HAVE_ACL_CREATE_ENTRY_NP /* MacOS X */
156 static const char empty_acl_text[] = "!#acl 1\n";
157 # else /* Unknown flavor of POSIX-like ACLs */
158 # error Unknown flavor of POSIX-like ACLs - add support for your platform.
161 acl = acl_from_text (empty_acl_text);
164 if (HAVE_ACL_SET_FD && desc != -1)
165 ret = acl_set_fd (desc, acl);
167 ret = acl_set_file (name, ACL_TYPE_ACCESS, acl);
170 int saved_errno = errno;
174 if (ACL_NOT_WELL_SUPPORTED (saved_errno))
176 if (chmod_or_fchmod (name, desc, mode) != 0)
187 return chmod_or_fchmod (name, desc, mode);
190 # elif defined ACL_NO_TRIVIAL
191 /* Solaris 10, with NFSv4 ACLs. */
193 char acl_text[] = "user::---,group::---,mask:---,other:---";
195 if (mode & S_IRUSR) acl_text[ 6] = 'r';
196 if (mode & S_IWUSR) acl_text[ 7] = 'w';
197 if (mode & S_IXUSR) acl_text[ 8] = 'x';
198 if (mode & S_IRGRP) acl_text[17] = acl_text[26] = 'r';
199 if (mode & S_IWGRP) acl_text[18] = acl_text[27] = 'w';
200 if (mode & S_IXGRP) acl_text[19] = acl_text[28] = 'x';
201 if (mode & S_IROTH) acl_text[36] = 'r';
202 if (mode & S_IWOTH) acl_text[37] = 'w';
203 if (mode & S_IXOTH) acl_text[38] = 'x';
205 if (acl_fromtext (acl_text, &aclp) != 0)
212 int ret = (desc < 0 ? acl_set (name, aclp) : facl_set (desc, aclp));
213 int saved_errno = errno;
215 if (ret == 0 || saved_errno != ENOSYS)
222 return chmod_or_fchmod (name, desc, mode);
224 # else /* Unknown flavor of ACLs */
225 return chmod_or_fchmod (name, desc, mode);
228 return chmod_or_fchmod (name, desc, mode);
232 /* As with qset_acl, but also output a diagnostic on failure. */
235 set_acl (char const *name, int desc, mode_t mode)
237 int r = qset_acl (name, desc, mode);
239 error (0, errno, _("setting permissions for %s"), quote (name));