1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2008, 2009 Edward Tomasz Napierała <trasz@FreeBSD.org>
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 */
27
28 #include <sys/cdefs.h>
29 #include <stdio.h>
30 #include <stdlib.h>
31 #include <string.h>
32 #include <assert.h>
33 #include <err.h>
34 #include <sys/acl.h>
35 #include "acl_support.h"
36
37 struct flagnames_struct {
38 uint32_t flag;
39 const char *name;
40 char letter;
41 };
42
43 struct flagnames_struct a_flags[] =
44 {{ ACL_ENTRY_FILE_INHERIT, "file_inherit", 'f'},
45 { ACL_ENTRY_DIRECTORY_INHERIT, "dir_inherit", 'd'},
46 { ACL_ENTRY_INHERIT_ONLY, "inherit_only", 'i'},
47 { ACL_ENTRY_NO_PROPAGATE_INHERIT, "no_propagate", 'n'},
48 { ACL_ENTRY_SUCCESSFUL_ACCESS, "successfull_access", 'S'},
49 { ACL_ENTRY_FAILED_ACCESS, "failed_access", 'F'},
50 { ACL_ENTRY_INHERITED, "inherited", 'I' },
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
58 struct 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'},
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
79 static const char *
format_flag(uint32_t * var,const struct flagnames_struct * flags)80 format_flag(uint32_t *var, const struct flagnames_struct *flags)
81 {
82
83 for (; flags->name != NULL; 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
94 static int
format_flags_verbose(char * str,size_t size,uint32_t var,const struct flagnames_struct * flags)95 format_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
118 static int
format_flags_compact(char * str,size_t size,uint32_t var,const struct flagnames_struct * flags)119 format_flags_compact(char *str, size_t size, uint32_t var,
120 const struct flagnames_struct *flags)
121 {
122 size_t i;
123
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
137 static int
parse_flags_verbose(const char * strp,uint32_t * var,const struct flagnames_struct * flags,const char * flags_name,int * try_compact)138 parse_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, *to_free;
144
145 str = strdup(strp);
146 to_free = str;
147 *try_compact = 0;
148 *var = 0;
149
150 while (str != NULL) {
151 flag = strsep(&str, "/:");
152
153 found = 0;
154 for (i = 0; flags[i].name != NULL; i++) {
155 if (strcmp(flags[i].name, flag) == 0) {
156 *var |= flags[i].flag;
157 found = 1;
158 ever_found = 1;
159 }
160 }
161
162 if (!found) {
163 if (ever_found)
164 warnx("malformed ACL: \"%s\" field contains "
165 "invalid flag \"%s\"", flags_name, flag);
166 else
167 *try_compact = 1;
168 free(to_free);
169 return (-1);
170 }
171 }
172
173 free(to_free);
174 return (0);
175 }
176
177 static int
parse_flags_compact(const char * str,uint32_t * var,const struct flagnames_struct * flags,const char * flags_name)178 parse_flags_compact(const char *str, uint32_t *var,
179 const struct flagnames_struct *flags, const char *flags_name)
180 {
181 int i, j, found;
182
183 *var = 0;
184
185 for (i = 0;; i++) {
186 if (str[i] == '\0')
187 return (0);
188
189 /* Ignore minus signs. */
190 if (str[i] == '-')
191 continue;
192
193 found = 0;
194
195 for (j = 0; flags[j].name != NULL; j++) {
196 if (flags[j].letter == str[i]) {
197 *var |= flags[j].flag;
198 found = 1;
199 break;
200 }
201 }
202
203 if (!found) {
204 warnx("malformed ACL: \"%s\" field contains "
205 "invalid flag \"%c\"", flags_name, str[i]);
206 return (-1);
207 }
208 }
209 }
210
211 int
_nfs4_format_flags(char * str,size_t size,acl_flag_t var,int verbose)212 _nfs4_format_flags(char *str, size_t size, acl_flag_t var, int verbose)
213 {
214
215 if (verbose)
216 return (format_flags_verbose(str, size, var, a_flags));
217
218 return (format_flags_compact(str, size, var, a_flags));
219 }
220
221 int
_nfs4_format_access_mask(char * str,size_t size,acl_perm_t var,int verbose)222 _nfs4_format_access_mask(char *str, size_t size, acl_perm_t var, int verbose)
223 {
224
225 if (verbose)
226 return (format_flags_verbose(str, size, var, a_access_masks));
227
228 return (format_flags_compact(str, size, var, a_access_masks));
229 }
230
231 int
_nfs4_parse_flags(const char * str,acl_flag_t * flags)232 _nfs4_parse_flags(const char *str, acl_flag_t *flags)
233 {
234 int error, try_compact;
235 int tmpflags;
236
237 error = parse_flags_verbose(str, &tmpflags, a_flags, "flags", &try_compact);
238 if (error && try_compact)
239 error = parse_flags_compact(str, &tmpflags, a_flags, "flags");
240
241 *flags = tmpflags;
242
243 return (error);
244 }
245
246 int
_nfs4_parse_access_mask(const char * str,acl_perm_t * perms)247 _nfs4_parse_access_mask(const char *str, acl_perm_t *perms)
248 {
249 int error, try_compact;
250 int tmpperms;
251
252 error = parse_flags_verbose(str, &tmpperms, a_access_masks,
253 "access permissions", &try_compact);
254 if (error && try_compact)
255 error = parse_flags_compact(str, &tmpperms,
256 a_access_masks, "access permissions");
257
258 *perms = tmpperms;
259
260 return (error);
261 }
262