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 __FBSDID("$FreeBSD: stable/12/lib/libc/posix1e/acl_support_nfs4.c 369656 2021-04-23 10:44:41Z freqlabs $");
31
32 #include <stdio.h>
33 #include <stdlib.h>
34 #include <string.h>
35 #include <assert.h>
36 #include <err.h>
37 #include <sys/acl.h>
38 #include "acl_support.h"
39
40 struct flagnames_struct {
41 uint32_t flag;
42 const char *name;
43 char letter;
44 };
45
46 struct flagnames_struct a_flags[] =
47 {{ ACL_ENTRY_FILE_INHERIT, "file_inherit", 'f'},
48 { ACL_ENTRY_DIRECTORY_INHERIT, "dir_inherit", 'd'},
49 { ACL_ENTRY_INHERIT_ONLY, "inherit_only", 'i'},
50 { ACL_ENTRY_NO_PROPAGATE_INHERIT, "no_propagate", 'n'},
51 { ACL_ENTRY_SUCCESSFUL_ACCESS, "successfull_access", 'S'},
52 { ACL_ENTRY_FAILED_ACCESS, "failed_access", 'F'},
53 { ACL_ENTRY_INHERITED, "inherited", 'I' },
54 /*
55 * There is no ACE_IDENTIFIER_GROUP here - SunOS does not show it
56 * in the "flags" field. There is no ACE_OWNER, ACE_GROUP or
57 * ACE_EVERYONE either, for obvious reasons.
58 */
59 { 0, 0, 0}};
60
61 struct flagnames_struct a_access_masks[] =
62 {{ ACL_READ_DATA, "read_data", 'r'},
63 { ACL_WRITE_DATA, "write_data", 'w'},
64 { ACL_EXECUTE, "execute", 'x'},
65 { ACL_APPEND_DATA, "append_data", 'p'},
66 { ACL_DELETE_CHILD, "delete_child", 'D'},
67 { ACL_DELETE, "delete", 'd'},
68 { ACL_READ_ATTRIBUTES, "read_attributes", 'a'},
69 { ACL_WRITE_ATTRIBUTES, "write_attributes", 'A'},
70 { ACL_READ_NAMED_ATTRS, "read_xattr", 'R'},
71 { ACL_WRITE_NAMED_ATTRS, "write_xattr", 'W'},
72 { ACL_READ_ACL, "read_acl", 'c'},
73 { ACL_WRITE_ACL, "write_acl", 'C'},
74 { ACL_WRITE_OWNER, "write_owner", 'o'},
75 { ACL_SYNCHRONIZE, "synchronize", 's'},
76 { ACL_FULL_SET, "full_set", '\0'},
77 { ACL_MODIFY_SET, "modify_set", '\0'},
78 { ACL_READ_SET, "read_set", '\0'},
79 { ACL_WRITE_SET, "write_set", '\0'},
80 { 0, 0, 0}};
81
82 static const char *
format_flag(uint32_t * var,const struct flagnames_struct * flags)83 format_flag(uint32_t *var, const struct flagnames_struct *flags)
84 {
85
86 for (; flags->name != NULL; flags++) {
87 if ((flags->flag & *var) == 0)
88 continue;
89
90 *var &= ~flags->flag;
91 return (flags->name);
92 }
93
94 return (NULL);
95 }
96
97 static int
format_flags_verbose(char * str,size_t size,uint32_t var,const struct flagnames_struct * flags)98 format_flags_verbose(char *str, size_t size, uint32_t var,
99 const struct flagnames_struct *flags)
100 {
101 size_t off = 0;
102 const char *tmp;
103
104 while ((tmp = format_flag(&var, flags)) != NULL) {
105 off += snprintf(str + off, size - off, "%s/", tmp);
106 assert (off < size);
107 }
108
109 /* If there were any flags added... */
110 if (off > 0) {
111 off--;
112 /* ... then remove the last slash. */
113 assert(str[off] == '/');
114 }
115
116 str[off] = '\0';
117
118 return (0);
119 }
120
121 static int
format_flags_compact(char * str,size_t size,uint32_t var,const struct flagnames_struct * flags)122 format_flags_compact(char *str, size_t size, uint32_t var,
123 const struct flagnames_struct *flags)
124 {
125 size_t i;
126
127 for (i = 0; flags[i].letter != '\0'; i++) {
128 assert(i < size);
129 if ((flags[i].flag & var) == 0)
130 str[i] = '-';
131 else
132 str[i] = flags[i].letter;
133 }
134
135 str[i] = '\0';
136
137 return (0);
138 }
139
140 static int
parse_flags_verbose(const char * strp,uint32_t * var,const struct flagnames_struct * flags,const char * flags_name,int * try_compact)141 parse_flags_verbose(const char *strp, uint32_t *var,
142 const struct flagnames_struct *flags, const char *flags_name,
143 int *try_compact)
144 {
145 int i, found, ever_found = 0;
146 char *str, *flag, *to_free;
147
148 str = strdup(strp);
149 to_free = str;
150 *try_compact = 0;
151 *var = 0;
152
153 while (str != NULL) {
154 flag = strsep(&str, "/:");
155
156 found = 0;
157 for (i = 0; flags[i].name != NULL; i++) {
158 if (strcmp(flags[i].name, flag) == 0) {
159 *var |= flags[i].flag;
160 found = 1;
161 ever_found = 1;
162 }
163 }
164
165 if (!found) {
166 if (ever_found)
167 warnx("malformed ACL: \"%s\" field contains "
168 "invalid flag \"%s\"", flags_name, flag);
169 else
170 *try_compact = 1;
171 free(to_free);
172 return (-1);
173 }
174 }
175
176 free(to_free);
177 return (0);
178 }
179
180 static int
parse_flags_compact(const char * str,uint32_t * var,const struct flagnames_struct * flags,const char * flags_name)181 parse_flags_compact(const char *str, uint32_t *var,
182 const struct flagnames_struct *flags, const char *flags_name)
183 {
184 int i, j, found;
185
186 *var = 0;
187
188 for (i = 0;; i++) {
189 if (str[i] == '\0')
190 return (0);
191
192 /* Ignore minus signs. */
193 if (str[i] == '-')
194 continue;
195
196 found = 0;
197
198 for (j = 0; flags[j].name != NULL; j++) {
199 if (flags[j].letter == str[i]) {
200 *var |= flags[j].flag;
201 found = 1;
202 break;
203 }
204 }
205
206 if (!found) {
207 warnx("malformed ACL: \"%s\" field contains "
208 "invalid flag \"%c\"", flags_name, str[i]);
209 return (-1);
210 }
211 }
212 }
213
214 int
_nfs4_format_flags(char * str,size_t size,acl_flag_t var,int verbose)215 _nfs4_format_flags(char *str, size_t size, acl_flag_t var, int verbose)
216 {
217
218 if (verbose)
219 return (format_flags_verbose(str, size, var, a_flags));
220
221 return (format_flags_compact(str, size, var, a_flags));
222 }
223
224 int
_nfs4_format_access_mask(char * str,size_t size,acl_perm_t var,int verbose)225 _nfs4_format_access_mask(char *str, size_t size, acl_perm_t var, int verbose)
226 {
227
228 if (verbose)
229 return (format_flags_verbose(str, size, var, a_access_masks));
230
231 return (format_flags_compact(str, size, var, a_access_masks));
232 }
233
234 int
_nfs4_parse_flags(const char * str,acl_flag_t * flags)235 _nfs4_parse_flags(const char *str, acl_flag_t *flags)
236 {
237 int error, try_compact;
238 int tmpflags;
239
240 error = parse_flags_verbose(str, &tmpflags, a_flags, "flags", &try_compact);
241 if (error && try_compact)
242 error = parse_flags_compact(str, &tmpflags, a_flags, "flags");
243
244 *flags = tmpflags;
245
246 return (error);
247 }
248
249 int
_nfs4_parse_access_mask(const char * str,acl_perm_t * perms)250 _nfs4_parse_access_mask(const char *str, acl_perm_t *perms)
251 {
252 int error, try_compact;
253 int tmpperms;
254
255 error = parse_flags_verbose(str, &tmpperms, a_access_masks,
256 "access permissions", &try_compact);
257 if (error && try_compact)
258 error = parse_flags_compact(str, &tmpperms,
259 a_access_masks, "access permissions");
260
261 *perms = tmpperms;
262
263 return (error);
264 }
265