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
|
/*-
* Copyright (c) 1999, 2000, 2001 Robert N. M. Watson
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
/*
* acl_from_text: Convert a text-form ACL from a string to an acl_t.
*/
#include <sys/types.h>
#include "namespace.h"
#include <sys/acl.h>
#include "un-namespace.h"
#include <sys/errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "acl_support.h"
static acl_tag_t acl_string_to_tag(char *tag, char *qualifier);
static char *string_skip_whitespace(char *string);
static void string_trim_trailing_whitespace(char *string);
static char *
string_skip_whitespace(char *string)
{
while (*string && ((*string == ' ') || (*string == '\t'))) {
string++;
}
return (string);
}
static void
string_trim_trailing_whitespace(char *string)
{
char *end;
if (*string == '\0')
return;
end = string + strlen(string) - 1;
while (end != string) {
if ((*end == ' ') || (*end == '\t')) {
*end = '\0';
end--;
} else {
return;
}
}
return;
}
static acl_tag_t
acl_string_to_tag(char *tag, char *qualifier)
{
if (*qualifier == '\0') {
if ((!strcmp(tag, "user")) || (!strcmp(tag, "u"))) {
return (ACL_USER_OBJ);
} else
if ((!strcmp(tag, "group")) || (!strcmp(tag, "g"))) {
return (ACL_GROUP_OBJ);
} else
if ((!strcmp(tag, "mask")) || (!strcmp(tag, "m"))) {
return (ACL_MASK);
} else
if ((!strcmp(tag, "other")) || (!strcmp(tag, "o"))) {
return (ACL_OTHER);
} else
return(-1);
} else {
if ((!strcmp(tag, "user")) || (!strcmp(tag, "u"))) {
return(ACL_USER);
} else
if ((!strcmp(tag, "group")) || (!strcmp(tag, "g"))) {
return(ACL_GROUP);
} else
return(-1);
}
}
/*
* acl_from_text -- Convert a string into an ACL.
* Postpone most validity checking until the end and call acl_valid() to do
* that.
*/
acl_t
acl_from_text(const char *buf_p)
{
acl_tag_t t;
acl_perm_t p;
acl_t acl;
char *mybuf_p, *line, *cur, *notcomment, *comment, *entry;
char *tag, *qualifier, *permission;
int error;
uid_t id;
/* Local copy we can mess up. */
mybuf_p = strdup(buf_p);
if (mybuf_p == NULL)
return(NULL);
acl = acl_init(3);
if (acl == NULL) {
free(mybuf_p);
return(NULL);
}
/* Outer loop: delimit at \n boundaries. */
cur = mybuf_p;
while ((line = strsep(&cur, "\n"))) {
/* Now split the line on the first # to strip out comments. */
comment = line;
notcomment = strsep(&comment, "#");
/* Inner loop: delimit at ',' boundaries. */
while ((entry = strsep(¬comment, ","))) {
/* Now split into three ':' delimited fields. */
tag = strsep(&entry, ":");
if (tag == NULL) {
errno = EINVAL;
goto error_label;
}
tag = string_skip_whitespace(tag);
if ((*tag == '\0') && (!entry)) {
/*
* Is an entirely comment line, skip to next
* comma.
*/
continue;
}
string_trim_trailing_whitespace(tag);
qualifier = strsep(&entry, ":");
if (qualifier == NULL) {
errno = EINVAL;
goto error_label;
}
qualifier = string_skip_whitespace(qualifier);
string_trim_trailing_whitespace(qualifier);
permission = strsep(&entry, ":");
if (permission == NULL || entry) {
errno = EINVAL;
goto error_label;
}
permission = string_skip_whitespace(permission);
string_trim_trailing_whitespace(permission);
t = acl_string_to_tag(tag, qualifier);
if (t == -1) {
errno = EINVAL;
goto error_label;
}
error = _posix1e_acl_string_to_perm(permission, &p);
if (error == -1) {
errno = EINVAL;
goto error_label;
}
switch(t) {
case ACL_USER_OBJ:
case ACL_GROUP_OBJ:
case ACL_MASK:
case ACL_OTHER:
if (*qualifier != '\0') {
errno = EINVAL;
goto error_label;
}
id = 0;
break;
case ACL_USER:
case ACL_GROUP:
error = _posix1e_acl_name_to_id(t, qualifier,
&id);
if (error == -1)
goto error_label;
break;
default:
errno = EINVAL;
goto error_label;
}
error = _posix1e_acl_add_entry(acl, t, id, p);
if (error == -1)
goto error_label;
}
}
#if 0
/* XXX Should we only return ACLs valid according to acl_valid? */
/* Verify validity of the ACL we read in. */
if (acl_valid(acl) == -1) {
errno = EINVAL;
goto error_label;
}
#endif
return(acl);
error_label:
acl_free(acl);
free(mybuf_p);
return(NULL);
}
|