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
30 Return 0 if successful. Return -1 and set errno upon failure. */
33 chmod_or_fchmod (const char *name, int desc, mode_t mode)
35 if (HAVE_FCHMOD && desc != -1)
36 return fchmod (desc, mode);
38 return chmod (name, mode);
41 /* Set the access control lists of a file. If DESC is a valid file
42 descriptor, use file descriptor operations where available, else use
43 filename based operations on NAME. If access control lists are not
44 available, fchmod the target file to MODE. Also sets the
45 non-permission bits of the destination file (S_ISUID, S_ISGID, S_ISVTX)
46 to those from MODE if any are set.
47 Return 0 if successful. Return -1 and set errno upon failure. */
50 qset_acl (char const *name, int desc, mode_t mode)
53 # if HAVE_ACL_GET_FILE
54 /* POSIX 1003.1e draft 17 (abandoned) specific version. */
55 /* Linux, FreeBSD, MacOS X, IRIX, Tru64 */
57 /* Linux, FreeBSD, IRIX, Tru64 */
59 /* We must also have acl_from_text and acl_delete_def_file.
60 (acl_delete_def_file could be emulated with acl_init followed
61 by acl_set_file, but acl_set_file with an empty acl is
64 # ifndef HAVE_ACL_FROM_TEXT
65 # error Must have acl_from_text (see POSIX 1003.1e draft 17).
67 # ifndef HAVE_ACL_DELETE_DEF_FILE
68 # error Must have acl_delete_def_file (see POSIX 1003.1e draft 17).
74 if (HAVE_ACL_FROM_MODE) /* Linux */
76 acl = acl_from_mode (mode);
80 else /* FreeBSD, IRIX, Tru64 */
82 /* If we were to create the ACL using the functions acl_init(),
83 acl_create_entry(), acl_set_tag_type(), acl_set_qualifier(),
84 acl_get_permset(), acl_clear_perm[s](), acl_add_perm(), we
85 would need to create a qualifier. I don't know how to do this.
86 So create it using acl_from_text(). */
88 # if HAVE_ACL_FREE_TEXT /* Tru64 */
89 char acl_text[] = "u::---,g::---,o::---,";
90 # else /* FreeBSD, IRIX */
91 char acl_text[] = "u::---,g::---,o::---";
94 if (mode & S_IRUSR) acl_text[ 3] = 'r';
95 if (mode & S_IWUSR) acl_text[ 4] = 'w';
96 if (mode & S_IXUSR) acl_text[ 5] = 'x';
97 if (mode & S_IRGRP) acl_text[10] = 'r';
98 if (mode & S_IWGRP) acl_text[11] = 'w';
99 if (mode & S_IXGRP) acl_text[12] = 'x';
100 if (mode & S_IROTH) acl_text[17] = 'r';
101 if (mode & S_IWOTH) acl_text[18] = 'w';
102 if (mode & S_IXOTH) acl_text[19] = 'x';
104 acl = acl_from_text (acl_text);
108 if (HAVE_ACL_SET_FD && desc != -1)
109 ret = acl_set_fd (desc, acl);
111 ret = acl_set_file (name, ACL_TYPE_ACCESS, acl);
114 int saved_errno = errno;
117 if (ACL_NOT_WELL_SUPPORTED (errno))
119 if (chmod_or_fchmod (name, desc, mode) != 0)
130 if (S_ISDIR (mode) && acl_delete_def_file (name))
133 if (mode & (S_ISUID | S_ISGID | S_ISVTX))
135 /* We did not call chmod so far, so the special bits have not yet
138 if (chmod_or_fchmod (name, desc, mode))
143 # else /* !MODE_INSIDE_ACL */
149 /* Remove the ACL if the file has ACLs. */
150 if (HAVE_ACL_GET_FD && desc != -1)
151 acl = acl_get_fd (desc);
153 acl = acl_get_file (name, ACL_TYPE_ACCESS);
156 # if HAVE_ACL_COPY_EXT_NATIVE && HAVE_ACL_CREATE_ENTRY_NP /* MacOS X */
157 static const char empty_acl_text[] = "!#acl 1\n";
158 # else /* Unknown flavor of POSIX-like ACLs */
159 # error Unknown flavor of POSIX-like ACLs - add support for your platform.
162 acl = acl_from_text (empty_acl_text);
165 if (HAVE_ACL_SET_FD && desc != -1)
166 ret = acl_set_fd (desc, acl);
168 ret = acl_set_file (name, ACL_TYPE_ACCESS, acl);
171 int saved_errno = errno;
175 if (ACL_NOT_WELL_SUPPORTED (saved_errno))
177 if (chmod_or_fchmod (name, desc, mode) != 0)
188 return chmod_or_fchmod (name, desc, mode);
191 # elif defined ACL_NO_TRIVIAL
192 /* Solaris 10, with NFSv4 ACLs. */
194 char acl_text[] = "user::---,group::---,mask:---,other:---";
196 if (mode & S_IRUSR) acl_text[ 6] = 'r';
197 if (mode & S_IWUSR) acl_text[ 7] = 'w';
198 if (mode & S_IXUSR) acl_text[ 8] = 'x';
199 if (mode & S_IRGRP) acl_text[17] = acl_text[26] = 'r';
200 if (mode & S_IWGRP) acl_text[18] = acl_text[27] = 'w';
201 if (mode & S_IXGRP) acl_text[19] = acl_text[28] = 'x';
202 if (mode & S_IROTH) acl_text[36] = 'r';
203 if (mode & S_IWOTH) acl_text[37] = 'w';
204 if (mode & S_IXOTH) acl_text[38] = 'x';
206 if (acl_fromtext (acl_text, &aclp) != 0)
213 int ret = (desc < 0 ? acl_set (name, aclp) : facl_set (desc, aclp));
214 int saved_errno = errno;
216 if (ret == 0 || saved_errno != ENOSYS)
223 return chmod_or_fchmod (name, desc, mode);
225 # else /* Unknown flavor of ACLs */
226 return chmod_or_fchmod (name, desc, mode);
229 return chmod_or_fchmod (name, desc, mode);
233 /* As with qset_acl, but also output a diagnostic on failure. */
236 set_acl (char const *name, int desc, mode_t mode)
238 int r = qset_acl (name, desc, mode);
240 error (0, errno, _("setting permissions for %s"), quote (name));