1/*-
2 * Copyright (c) 2008, 2009 Edward Tomasz Napiera��a <trasz@FreeBSD.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
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28__FBSDID("$FreeBSD: head/lib/libc/posix1e/acl_support_nfs4.c 194957 2009-06-25 13:08:02Z trasz $");
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| 28__FBSDID("$FreeBSD: head/lib/libc/posix1e/acl_support_nfs4.c 220465 2011-04-09 07:42:25Z trasz $"); |
29
30#include <stdio.h>
31#include <stdlib.h>
32#include <string.h>
33#include <assert.h>
34#include <err.h>
35#include <sys/acl.h>
36#include "acl_support.h"
37
38struct flagnames_struct {
39 uint32_t flag;
40 const char *name;
41 char letter;
42};
43
44struct flagnames_struct a_flags[] =
45 {{ ACL_ENTRY_FILE_INHERIT, "file_inherit", 'f'},
46 { ACL_ENTRY_DIRECTORY_INHERIT, "dir_inherit", 'd'},
47 { ACL_ENTRY_INHERIT_ONLY, "inherit_only", 'i'},
48 { ACL_ENTRY_NO_PROPAGATE_INHERIT, "no_propagate", 'n'},
49 { ACL_ENTRY_SUCCESSFUL_ACCESS, "successfull_access", 'S'},
50 { ACL_ENTRY_FAILED_ACCESS, "failed_access", 'F'},
51 /*
52 * There is no ACE_IDENTIFIER_GROUP here - SunOS does not show it
53 * in the "flags" field. There is no ACE_OWNER, ACE_GROUP or
54 * ACE_EVERYONE either, for obvious reasons.
55 */
56 { 0, 0, 0}};
57
58struct flagnames_struct a_access_masks[] =
59 {{ ACL_READ_DATA, "read_data", 'r'},
60 { ACL_WRITE_DATA, "write_data", 'w'},
61 { ACL_EXECUTE, "execute", 'x'},
62 { ACL_APPEND_DATA, "append_data", 'p'},
63 { ACL_DELETE_CHILD, "delete_child", 'D'},
64 { ACL_DELETE, "delete", 'd'},
65 { ACL_READ_ATTRIBUTES, "read_attributes", 'a'},
66 { ACL_WRITE_ATTRIBUTES, "write_attributes", 'A'},
67 { ACL_READ_NAMED_ATTRS, "read_xattr", 'R'},
68 { ACL_WRITE_NAMED_ATTRS, "write_xattr", 'W'},
69 { ACL_READ_ACL, "read_acl", 'c'},
70 { ACL_WRITE_ACL, "write_acl", 'C'},
71 { ACL_WRITE_OWNER, "write_owner", 'o'},
72 { ACL_SYNCHRONIZE, "synchronize", 's'},
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73 { ACL_FULL_SET, "full_set", '\0'},
74 { ACL_MODIFY_SET, "modify_set", '\0'},
75 { ACL_READ_SET, "read_set", '\0'},
76 { ACL_WRITE_SET, "write_set", '\0'}, |
77 { 0, 0, 0}};
78
79static const char *
80format_flag(uint32_t *var, const struct flagnames_struct *flags)
81{
82
83 for (; flags->name != 0; flags++) {
84 if ((flags->flag & *var) == 0)
85 continue;
86
87 *var &= ~flags->flag;
88 return (flags->name);
89 }
90
91 return (NULL);
92}
93
94static int
95format_flags_verbose(char *str, size_t size, uint32_t var,
96 const struct flagnames_struct *flags)
97{
98 size_t off = 0;
99 const char *tmp;
100
101 while ((tmp = format_flag(&var, flags)) != NULL) {
102 off += snprintf(str + off, size - off, "%s/", tmp);
103 assert (off < size);
104 }
105
106 /* If there were any flags added... */
107 if (off > 0) {
108 off--;
109 /* ... then remove the last slash. */
110 assert(str[off] == '/');
111 }
112
113 str[off] = '\0';
114
115 return (0);
116}
117
118static int
119format_flags_compact(char *str, size_t size, uint32_t var,
120 const struct flagnames_struct *flags)
121{
122 size_t i;
123
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120 for (i = 0; flags[i].name != NULL; i++) {
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| 124 for (i = 0; flags[i].letter != '\0'; i++) { |
125 assert(i < size);
126 if ((flags[i].flag & var) == 0)
127 str[i] = '-';
128 else
129 str[i] = flags[i].letter;
130 }
131
132 str[i] = '\0';
133
134 return (0);
135}
136
137static int
138parse_flags_verbose(const char *strp, uint32_t *var,
139 const struct flagnames_struct *flags, const char *flags_name,
140 int *try_compact)
141{
142 int i, found, ever_found = 0;
143 char *str, *flag;
144
145 str = strdup(strp);
146 *try_compact = 0;
147 *var = 0;
148
149 while (str != NULL) {
150 flag = strsep(&str, "/:");
151
152 found = 0;
153 for (i = 0; flags[i].name != NULL; i++) {
154 if (strcmp(flags[i].name, flag) == 0) {
155 *var |= flags[i].flag;
156 found = 1;
157 ever_found = 1;
158 }
159 }
160
161 if (!found) {
162 if (ever_found)
163 warnx("malformed ACL: \"%s\" field contains "
164 "invalid flag \"%s\"", flags_name, flag);
165 else
166 *try_compact = 1;
167 free(str);
168 return (-1);
169 }
170 }
171
172 free(str);
173 return (0);
174}
175
176static int
177parse_flags_compact(const char *str, uint32_t *var,
178 const struct flagnames_struct *flags, const char *flags_name)
179{
180 int i, j, found;
181
182 *var = 0;
183
184 for (i = 0;; i++) {
185 if (str[i] == '\0')
186 return (0);
187
188 /* Ignore minus signs. */
189 if (str[i] == '-')
190 continue;
191
192 found = 0;
193
194 for (j = 0; flags[j].name != NULL; j++) {
195 if (flags[j].letter == str[i]) {
196 *var |= flags[j].flag;
197 found = 1;
198 break;
199 }
200 }
201
202 if (!found) {
203 warnx("malformed ACL: \"%s\" field contains "
204 "invalid flag \"%c\"", flags_name, str[i]);
205 return (-1);
206 }
207 }
208}
209
210int
211_nfs4_format_flags(char *str, size_t size, acl_flag_t var, int verbose)
212{
213
214 if (verbose)
215 return (format_flags_verbose(str, size, var, a_flags));
216
217 return (format_flags_compact(str, size, var, a_flags));
218}
219
220int
221_nfs4_format_access_mask(char *str, size_t size, acl_perm_t var, int verbose)
222{
223
224 if (verbose)
225 return (format_flags_verbose(str, size, var, a_access_masks));
226
227 return (format_flags_compact(str, size, var, a_access_masks));
228}
229
230int
231_nfs4_parse_flags(const char *str, acl_flag_t *flags)
232{
233 int error, try_compact;
234 int tmpflags;
235
236 error = parse_flags_verbose(str, &tmpflags, a_flags, "flags", &try_compact);
237 if (error && try_compact)
238 error = parse_flags_compact(str, &tmpflags, a_flags, "flags");
239
240 *flags = tmpflags;
241
242 return (error);
243}
244
245int
246_nfs4_parse_access_mask(const char *str, acl_perm_t *perms)
247{
248 int error, try_compact;
249 int tmpperms;
250
251 error = parse_flags_verbose(str, &tmpperms, a_access_masks,
252 "access permissions", &try_compact);
253 if (error && try_compact)
254 error = parse_flags_compact(str, &tmpperms,
255 a_access_masks, "access permissions");
256
257 *perms = tmpperms;
258
259 return (error);
260}
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