1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
|
/* acl.c - access control lists
Copyright (C) 2002-2003, 2005-2008 Free Software Foundation, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
Written by Paul Eggert and Andreas Gruenbacher. */
#include <config.h>
#include "acl.h"
#include "acl-internal.h"
/* If DESC is a valid file descriptor use fchmod to change the
file's mode to MODE on systems that have fchown. On systems
that don't have fchown and if DESC is invalid, use chown on
NAME instead. */
int
chmod_or_fchmod (const char *name, int desc, mode_t mode)
{
if (HAVE_FCHMOD && desc != -1)
return fchmod (desc, mode);
else
return chmod (name, mode);
}
/* Set the access control lists of a file. If DESC is a valid file
descriptor, use file descriptor operations where available, else use
filename based operations on NAME. If access control lists are not
available, fchmod the target file to MODE. Also sets the
non-permission bits of the destination file (S_ISUID, S_ISGID, S_ISVTX)
to those from MODE if any are set. System call return value
semantics. */
int
qset_acl (char const *name, int desc, mode_t mode)
{
#if USE_ACL
# if MODE_INSIDE_ACL
# if HAVE_ACL_SET_FILE && HAVE_ACL_FREE
/* POSIX 1003.1e draft 17 (abandoned) specific version. */
/* Linux, FreeBSD, IRIX, Tru64 */
/* We must also have acl_from_text and acl_delete_def_file.
(acl_delete_def_file could be emulated with acl_init followed
by acl_set_file, but acl_set_file with an empty acl is
unspecified.) */
# ifndef HAVE_ACL_FROM_TEXT
# error Must have acl_from_text (see POSIX 1003.1e draft 17).
# endif
# ifndef HAVE_ACL_DELETE_DEF_FILE
# error Must have acl_delete_def_file (see POSIX 1003.1e draft 17).
# endif
acl_t acl;
int ret;
if (HAVE_ACL_FROM_MODE) /* Linux */
{
acl = acl_from_mode (mode);
if (!acl)
return -1;
}
else /* FreeBSD, IRIX, Tru64 */
{
/* If we were to create the ACL using the functions acl_init(),
acl_create_entry(), acl_set_tag_type(), acl_set_qualifier(),
acl_get_permset(), acl_clear_perm[s](), acl_add_perm(), we
would need to create a qualifier. I don't know how to do this.
So create it using acl_from_text(). */
# if HAVE_ACL_FREE_TEXT /* Tru64 */
char acl_text[] = "u::---,g::---,o::---,";
# else /* FreeBSD, IRIX */
char acl_text[] = "u::---,g::---,o::---";
# endif
if (mode & S_IRUSR) acl_text[ 3] = 'r';
if (mode & S_IWUSR) acl_text[ 4] = 'w';
if (mode & S_IXUSR) acl_text[ 5] = 'x';
if (mode & S_IRGRP) acl_text[10] = 'r';
if (mode & S_IWGRP) acl_text[11] = 'w';
if (mode & S_IXGRP) acl_text[12] = 'x';
if (mode & S_IROTH) acl_text[17] = 'r';
if (mode & S_IWOTH) acl_text[18] = 'w';
if (mode & S_IXOTH) acl_text[19] = 'x';
acl = acl_from_text (acl_text);
if (!acl)
return -1;
}
if (HAVE_ACL_SET_FD && desc != -1)
ret = acl_set_fd (desc, acl);
else
ret = acl_set_file (name, ACL_TYPE_ACCESS, acl);
if (ret != 0)
{
int saved_errno = errno;
acl_free (acl);
if (ACL_NOT_WELL_SUPPORTED (errno))
{
if (chmod_or_fchmod (name, desc, mode) != 0)
saved_errno = errno;
else
return 0;
}
errno = saved_errno;
return -1;
}
else
acl_free (acl);
if (S_ISDIR (mode) && acl_delete_def_file (name))
return -1;
if (mode & (S_ISUID | S_ISGID | S_ISVTX))
{
/* We did not call chmod so far, so the special bits have not yet
been set. */
if (chmod_or_fchmod (name, desc, mode))
return -1;
}
return 0;
# elif defined ACL_NO_TRIVIAL
/* Solaris 10, with NFSv4 ACLs. */
acl_t *aclp;
char acl_text[] = "user::---,group::---,mask:---,other:---";
if (mode & S_IRUSR) acl_text[ 6] = 'r';
if (mode & S_IWUSR) acl_text[ 7] = 'w';
if (mode & S_IXUSR) acl_text[ 8] = 'x';
if (mode & S_IRGRP) acl_text[17] = acl_text[26] = 'r';
if (mode & S_IWGRP) acl_text[18] = acl_text[27] = 'w';
if (mode & S_IXGRP) acl_text[19] = acl_text[28] = 'x';
if (mode & S_IROTH) acl_text[36] = 'r';
if (mode & S_IWOTH) acl_text[37] = 'w';
if (mode & S_IXOTH) acl_text[38] = 'x';
if (acl_fromtext (acl_text, &aclp) != 0)
{
errno = ENOMEM;
return -1;
}
else
{
int acl_result = (desc < 0 ? acl_set (name, aclp) : facl_set (desc, aclp));
int acl_errno = errno;
acl_free (aclp);
if (acl_result == 0 || acl_errno != ENOSYS)
{
errno = acl_errno;
return acl_result;
}
}
return chmod_or_fchmod (name, desc, mode);
# else /* Unknown flavor of ACLs */
return chmod_or_fchmod (name, desc, mode);
# endif
# else /* !MODE_INSIDE_ACL */
# if HAVE_ACL_SET_FILE && HAVE_ACL_FREE
/* POSIX 1003.1e draft 17 (abandoned) specific version. */
/* MacOS X */
acl_t acl;
int ret;
/* Remove the ACL if the file has ACLs. */
if (HAVE_ACL_GET_FD && desc != -1)
acl = acl_get_fd (desc);
else
acl = acl_get_file (name, ACL_TYPE_ACCESS);
if (acl)
{
# if HAVE_ACL_COPY_EXT_NATIVE && HAVE_ACL_CREATE_ENTRY_NP /* MacOS X */
static const char empty_acl_text[] = "!#acl 1\n";
# else /* Unknown flavor of POSIX-like ACLs */
# error Unknown flavor of POSIX-like ACLs - add support for your platform.
# endif
acl = acl_from_text (empty_acl_text);
if (acl)
{
if (HAVE_ACL_SET_FD && desc != -1)
ret = acl_set_fd (desc, acl);
else
ret = acl_set_file (name, ACL_TYPE_ACCESS, acl);
if (ret != 0)
{
int saved_errno = errno;
acl_free (acl);
if (ACL_NOT_WELL_SUPPORTED (saved_errno))
{
if (chmod_or_fchmod (name, desc, mode) != 0)
saved_errno = errno;
else
return 0;
}
errno = saved_errno;
return -1;
}
}
}
return chmod_or_fchmod (name, desc, mode);
# else /* Unknown flavor of ACLs */
return chmod_or_fchmod (name, desc, mode);
# endif
# endif
#else /* !USE_ACL */
return chmod_or_fchmod (name, desc, mode);
#endif
}
/* As with qset_acl, but also output a diagnostic on failure. */
int
set_acl (char const *name, int desc, mode_t mode)
{
int r = qset_acl (name, desc, mode);
if (r != 0)
error (0, errno, _("setting permissions for %s"), quote (name));
return r;
}
|
