1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2008, 2009 Edward Tomasz Napierała <trasz@FreeBSD.org>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #include <sys/cdefs.h>
30 #if 0
31 __FBSDID("$FreeBSD: head/lib/libc/posix1e/acl_support_nfs4.c 326193 2017-11-25 17:12:48Z pfg $");
32 #else
33 __RCSID("$NetBSD: acl_support_nfs4.c,v 1.2 2024/01/20 14:52:48 christos Exp $");
34 #endif
35
36 #include <stdio.h>
37 #include <stdlib.h>
38 #include <string.h>
39 #include <assert.h>
40 #include <err.h>
41 #include <sys/acl.h>
42 #include "acl_support.h"
43
44 struct flagnames_struct {
45 uint32_t flag;
46 const char *name;
47 char letter;
48 };
49
50 static struct flagnames_struct a_flags[] =
51 {{ ACL_ENTRY_FILE_INHERIT, "file_inherit", 'f'},
52 { ACL_ENTRY_DIRECTORY_INHERIT, "dir_inherit", 'd'},
53 { ACL_ENTRY_INHERIT_ONLY, "inherit_only", 'i'},
54 { ACL_ENTRY_NO_PROPAGATE_INHERIT, "no_propagate", 'n'},
55 { ACL_ENTRY_SUCCESSFUL_ACCESS, "successfull_access", 'S'},
56 { ACL_ENTRY_FAILED_ACCESS, "failed_access", 'F'},
57 { ACL_ENTRY_INHERITED, "inherited", 'I' },
58 /*
59 * There is no ACE_IDENTIFIER_GROUP here - SunOS does not show it
60 * in the "flags" field. There is no ACE_OWNER, ACE_GROUP or
61 * ACE_EVERYONE either, for obvious reasons.
62 */
63 { 0, 0, 0}};
64
65 static struct flagnames_struct a_access_masks[] =
66 {{ ACL_READ_DATA, "read_data", 'r'},
67 { ACL_WRITE_DATA, "write_data", 'w'},
68 { ACL_EXECUTE, "execute", 'x'},
69 { ACL_APPEND_DATA, "append_data", 'p'},
70 { ACL_DELETE_CHILD, "delete_child", 'D'},
71 { ACL_DELETE, "delete", 'd'},
72 { ACL_READ_ATTRIBUTES, "read_attributes", 'a'},
73 { ACL_WRITE_ATTRIBUTES, "write_attributes", 'A'},
74 { ACL_READ_NAMED_ATTRS, "read_xattr", 'R'},
75 { ACL_WRITE_NAMED_ATTRS, "write_xattr", 'W'},
76 { ACL_READ_ACL, "read_acl", 'c'},
77 { ACL_WRITE_ACL, "write_acl", 'C'},
78 { ACL_WRITE_OWNER, "write_owner", 'o'},
79 { ACL_SYNCHRONIZE, "synchronize", 's'},
80 { ACL_FULL_SET, "full_set", '\0'},
81 { ACL_MODIFY_SET, "modify_set", '\0'},
82 { ACL_READ_SET, "read_set", '\0'},
83 { ACL_WRITE_SET, "write_set", '\0'},
84 { 0, 0, 0}};
85
86 static const char *
format_flag(uint32_t * var,const struct flagnames_struct * flags)87 format_flag(uint32_t *var, const struct flagnames_struct *flags)
88 {
89
90 for (; flags->name != NULL; flags++) {
91 if ((flags->flag & *var) == 0)
92 continue;
93
94 *var &= ~flags->flag;
95 return (flags->name);
96 }
97
98 return (NULL);
99 }
100
101 static int
format_flags_verbose(char * str,size_t size,uint32_t var,const struct flagnames_struct * flags)102 format_flags_verbose(char *str, size_t size, uint32_t var,
103 const struct flagnames_struct *flags)
104 {
105 size_t off = 0;
106 const char *tmp;
107
108 while ((tmp = format_flag(&var, flags)) != NULL) {
109 off += snprintf(str + off, size - off, "%s/", tmp);
110 assert (off < size);
111 }
112
113 /* If there were any flags added... */
114 if (off > 0) {
115 off--;
116 /* ... then remove the last slash. */
117 assert(str[off] == '/');
118 }
119
120 str[off] = '\0';
121
122 return (0);
123 }
124
125 static int
format_flags_compact(char * str,size_t size,uint32_t var,const struct flagnames_struct * flags)126 format_flags_compact(char *str, size_t size, uint32_t var,
127 const struct flagnames_struct *flags)
128 {
129 size_t i;
130
131 for (i = 0; flags[i].letter != '\0'; i++) {
132 assert(i < size);
133 if ((flags[i].flag & var) == 0)
134 str[i] = '-';
135 else
136 str[i] = flags[i].letter;
137 }
138
139 str[i] = '\0';
140
141 return (0);
142 }
143
144 static int
parse_flags_verbose(const char * strp,uint32_t * var,const struct flagnames_struct * flags,const char * flags_name,int * try_compact)145 parse_flags_verbose(const char *strp, uint32_t *var,
146 const struct flagnames_struct *flags, const char *flags_name,
147 int *try_compact)
148 {
149 int i, found, ever_found = 0;
150 char *str, *flag;
151
152 str = strdup(strp);
153 *try_compact = 0;
154 *var = 0;
155
156 while (str != NULL) {
157 flag = strsep(&str, "/:");
158
159 found = 0;
160 for (i = 0; flags[i].name != NULL; i++) {
161 if (strcmp(flags[i].name, flag) == 0) {
162 *var |= flags[i].flag;
163 found = 1;
164 ever_found = 1;
165 }
166 }
167
168 if (!found) {
169 if (ever_found)
170 warnx("malformed ACL: \"%s\" field contains "
171 "invalid flag \"%s\"", flags_name, flag);
172 else
173 *try_compact = 1;
174 free(str);
175 return (-1);
176 }
177 }
178
179 free(str);
180 return (0);
181 }
182
183 static int
parse_flags_compact(const char * str,uint32_t * var,const struct flagnames_struct * flags,const char * flags_name)184 parse_flags_compact(const char *str, uint32_t *var,
185 const struct flagnames_struct *flags, const char *flags_name)
186 {
187 int i, j, found;
188
189 *var = 0;
190
191 for (i = 0;; i++) {
192 if (str[i] == '\0')
193 return (0);
194
195 /* Ignore minus signs. */
196 if (str[i] == '-')
197 continue;
198
199 found = 0;
200
201 for (j = 0; flags[j].name != NULL; j++) {
202 if (flags[j].letter == str[i]) {
203 *var |= flags[j].flag;
204 found = 1;
205 break;
206 }
207 }
208
209 if (!found) {
210 warnx("malformed ACL: \"%s\" field contains "
211 "invalid flag \"%c\"", flags_name, str[i]);
212 return (-1);
213 }
214 }
215 }
216
217 int
_nfs4_format_flags(char * str,size_t size,acl_flag_t var,int verbose)218 _nfs4_format_flags(char *str, size_t size, acl_flag_t var, int verbose)
219 {
220
221 if (verbose)
222 return (format_flags_verbose(str, size, var, a_flags));
223
224 return (format_flags_compact(str, size, var, a_flags));
225 }
226
227 int
_nfs4_format_access_mask(char * str,size_t size,acl_perm_t var,int verbose)228 _nfs4_format_access_mask(char *str, size_t size, acl_perm_t var, int verbose)
229 {
230
231 if (verbose)
232 return (format_flags_verbose(str, size, var, a_access_masks));
233
234 return (format_flags_compact(str, size, var, a_access_masks));
235 }
236
237 int
_nfs4_parse_flags(const char * str,acl_flag_t * flags)238 _nfs4_parse_flags(const char *str, acl_flag_t *flags)
239 {
240 int error, try_compact;
241 unsigned int tmpflags;
242
243 error = parse_flags_verbose(str, &tmpflags, a_flags, "flags", &try_compact);
244 if (error && try_compact)
245 error = parse_flags_compact(str, &tmpflags, a_flags, "flags");
246
247 *flags = tmpflags;
248
249 return (error);
250 }
251
252 int
_nfs4_parse_access_mask(const char * str,acl_perm_t * perms)253 _nfs4_parse_access_mask(const char *str, acl_perm_t *perms)
254 {
255 int error, try_compact;
256 unsigned int tmpperms;
257
258 error = parse_flags_verbose(str, &tmpperms, a_access_masks,
259 "access permissions", &try_compact);
260 if (error && try_compact)
261 error = parse_flags_compact(str, &tmpperms,
262 a_access_masks, "access permissions");
263
264 *perms = tmpperms;
265
266 return (error);
267 }
268