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 <stdio.h>
29 #include <stdlib.h>
30 #include <string.h>
31 #include <assert.h>
32 #include <err.h>
33 #include <sys/acl.h>
34 #include "acl_support.h"
35
36 struct flagnames_struct {
37 uint32_t flag;
38 const char *name;
39 char letter;
40 };
41
42 struct flagnames_struct a_flags[] =
43 {{ ACL_ENTRY_FILE_INHERIT, "file_inherit", 'f'},
44 { ACL_ENTRY_DIRECTORY_INHERIT, "dir_inherit", 'd'},
45 { ACL_ENTRY_INHERIT_ONLY, "inherit_only", 'i'},
46 { ACL_ENTRY_NO_PROPAGATE_INHERIT, "no_propagate", 'n'},
47 { ACL_ENTRY_SUCCESSFUL_ACCESS, "successfull_access", 'S'},
48 { ACL_ENTRY_FAILED_ACCESS, "failed_access", 'F'},
49 { ACL_ENTRY_INHERITED, "inherited", 'I' },
50 /*
51 * There is no ACE_IDENTIFIER_GROUP here - SunOS does not show it
52 * in the "flags" field. There is no ACE_OWNER, ACE_GROUP or
53 * ACE_EVERYONE either, for obvious reasons.
54 */
55 { 0, 0, 0}};
56
57 struct flagnames_struct a_access_masks[] =
58 {{ ACL_READ_DATA, "read_data", 'r'},
59 { ACL_WRITE_DATA, "write_data", 'w'},
60 { ACL_EXECUTE, "execute", 'x'},
61 { ACL_APPEND_DATA, "append_data", 'p'},
62 { ACL_DELETE_CHILD, "delete_child", 'D'},
63 { ACL_DELETE, "delete", 'd'},
64 { ACL_READ_ATTRIBUTES, "read_attributes", 'a'},
65 { ACL_WRITE_ATTRIBUTES, "write_attributes", 'A'},
66 { ACL_READ_NAMED_ATTRS, "read_xattr", 'R'},
67 { ACL_WRITE_NAMED_ATTRS, "write_xattr", 'W'},
68 { ACL_READ_ACL, "read_acl", 'c'},
69 { ACL_WRITE_ACL, "write_acl", 'C'},
70 { ACL_WRITE_OWNER, "write_owner", 'o'},
71 { ACL_SYNCHRONIZE, "synchronize", 's'},
72 { ACL_FULL_SET, "full_set", '\0'},
73 { ACL_MODIFY_SET, "modify_set", '\0'},
74 { ACL_READ_SET, "read_set", '\0'},
75 { ACL_WRITE_SET, "write_set", '\0'},
76 { 0, 0, 0}};
77
78 static const char *
format_flag(uint32_t * var,const struct flagnames_struct * flags)79 format_flag(uint32_t *var, const struct flagnames_struct *flags)
80 {
81
82 for (; flags->name != NULL; flags++) {
83 if ((flags->flag & *var) == 0)
84 continue;
85
86 *var &= ~flags->flag;
87 return (flags->name);
88 }
89
90 return (NULL);
91 }
92
93 static int
format_flags_verbose(char * str,size_t size,uint32_t var,const struct flagnames_struct * flags)94 format_flags_verbose(char *str, size_t size, uint32_t var,
95 const struct flagnames_struct *flags)
96 {
97 size_t off = 0;
98 const char *tmp;
99
100 while ((tmp = format_flag(&var, flags)) != NULL) {
101 off += snprintf(str + off, size - off, "%s/", tmp);
102 assert (off < size);
103 }
104
105 /* If there were any flags added... */
106 if (off > 0) {
107 off--;
108 /* ... then remove the last slash. */
109 assert(str[off] == '/');
110 }
111
112 str[off] = '\0';
113
114 return (0);
115 }
116
117 static int
format_flags_compact(char * str,size_t size,uint32_t var,const struct flagnames_struct * flags)118 format_flags_compact(char *str, size_t size, uint32_t var,
119 const struct flagnames_struct *flags)
120 {
121 size_t i;
122
123 for (i = 0; flags[i].letter != '\0'; i++) {
124 assert(i < size);
125 if ((flags[i].flag & var) == 0)
126 str[i] = '-';
127 else
128 str[i] = flags[i].letter;
129 }
130
131 str[i] = '\0';
132
133 return (0);
134 }
135
136 static int
parse_flags_verbose(const char * strp,uint32_t * var,const struct flagnames_struct * flags,const char * flags_name,int * try_compact)137 parse_flags_verbose(const char *strp, uint32_t *var,
138 const struct flagnames_struct *flags, const char *flags_name,
139 int *try_compact)
140 {
141 int i, found, ever_found = 0;
142 char *str, *flag, *to_free;
143
144 str = strdup(strp);
145 to_free = str;
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(to_free);
168 return (-1);
169 }
170 }
171
172 free(to_free);
173 return (0);
174 }
175
176 static int
parse_flags_compact(const char * str,uint32_t * var,const struct flagnames_struct * flags,const char * flags_name)177 parse_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
210 int
_nfs4_format_flags(char * str,size_t size,acl_flag_t var,int verbose)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
220 int
_nfs4_format_access_mask(char * str,size_t size,acl_perm_t var,int verbose)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
230 int
_nfs4_parse_flags(const char * str,acl_flag_t * flags)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
245 int
_nfs4_parse_access_mask(const char * str,acl_perm_t * perms)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 }
261