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_from_text_nfs4.c 326193 2017-11-25 17:12:48Z pfg $");
31
32 #include <stdio.h>
33 #include <stdlib.h>
34 #include <unistd.h>
35 #include <errno.h>
36 #include <assert.h>
37 #include <string.h>
38 #include <pwd.h>
39 #include <grp.h>
40 #include <ctype.h>
41 #include <err.h>
42 #include <sys/syscall.h>
43 #include <sys/types.h>
44 #include <sys/acl.h>
45
46 #include "acl_support.h"
47
48 #define MAX_ENTRY_LENGTH 512
49
50 /*
51 * Parse the tag field of ACL entry passed as "str". If qualifier
52 * needs to follow, then the variable referenced by "need_qualifier"
53 * is set to 1, otherwise it's set to 0.
54 */
55 static int
parse_tag(const char * str,acl_entry_t entry,int * need_qualifier)56 parse_tag(const char *str, acl_entry_t entry, int *need_qualifier)
57 {
58
59 assert(need_qualifier != NULL);
60 *need_qualifier = 0;
61
62 if (strcmp(str, "owner@") == 0)
63 return (acl_set_tag_type(entry, ACL_USER_OBJ));
64 if (strcmp(str, "group@") == 0)
65 return (acl_set_tag_type(entry, ACL_GROUP_OBJ));
66 if (strcmp(str, "everyone@") == 0)
67 return (acl_set_tag_type(entry, ACL_EVERYONE));
68
69 *need_qualifier = 1;
70
71 if (strcmp(str, "user") == 0 || strcmp(str, "u") == 0)
72 return (acl_set_tag_type(entry, ACL_USER));
73 if (strcmp(str, "group") == 0 || strcmp(str, "g") == 0)
74 return (acl_set_tag_type(entry, ACL_GROUP));
75
76 warnx("malformed ACL: invalid \"tag\" field");
77
78 return (-1);
79 }
80
81 /*
82 * Parse the qualifier field of ACL entry passed as "str".
83 * If user or group name cannot be resolved, then the variable
84 * referenced by "need_qualifier" is set to 1; it will be checked
85 * later to figure out whether the appended_id is required.
86 */
87 static int
parse_qualifier(char * str,acl_entry_t entry,int * need_qualifier)88 parse_qualifier(char *str, acl_entry_t entry, int *need_qualifier)
89 {
90 int qualifier_length, error;
91 uid_t id;
92 acl_tag_t tag;
93
94 assert(need_qualifier != NULL);
95 *need_qualifier = 0;
96
97 qualifier_length = strlen(str);
98
99 if (qualifier_length == 0) {
100 warnx("malformed ACL: empty \"qualifier\" field");
101 return (-1);
102 }
103
104 error = acl_get_tag_type(entry, &tag);
105 if (error)
106 return (error);
107
108 error = _acl_name_to_id(tag, str, &id);
109 if (error) {
110 *need_qualifier = 1;
111 return (0);
112 }
113
114 return (acl_set_qualifier(entry, &id));
115 }
116
117 static int
parse_access_mask(char * str,acl_entry_t entry)118 parse_access_mask(char *str, acl_entry_t entry)
119 {
120 int error;
121 acl_perm_t perm;
122
123 error = _nfs4_parse_access_mask(str, &perm);
124 if (error)
125 return (error);
126
127 error = acl_set_permset(entry, &perm);
128
129 return (error);
130 }
131
132 static int
parse_flags(char * str,acl_entry_t entry)133 parse_flags(char *str, acl_entry_t entry)
134 {
135 int error;
136 acl_flag_t flags;
137
138 error = _nfs4_parse_flags(str, &flags);
139 if (error)
140 return (error);
141
142 error = acl_set_flagset_np(entry, &flags);
143
144 return (error);
145 }
146
147 static int
parse_entry_type(const char * str,acl_entry_t entry)148 parse_entry_type(const char *str, acl_entry_t entry)
149 {
150
151 if (strcmp(str, "allow") == 0)
152 return (acl_set_entry_type_np(entry, ACL_ENTRY_TYPE_ALLOW));
153 if (strcmp(str, "deny") == 0)
154 return (acl_set_entry_type_np(entry, ACL_ENTRY_TYPE_DENY));
155 if (strcmp(str, "audit") == 0)
156 return (acl_set_entry_type_np(entry, ACL_ENTRY_TYPE_AUDIT));
157 if (strcmp(str, "alarm") == 0)
158 return (acl_set_entry_type_np(entry, ACL_ENTRY_TYPE_ALARM));
159
160 warnx("malformed ACL: invalid \"type\" field");
161
162 return (-1);
163 }
164
165 static int
parse_appended_id(char * str,acl_entry_t entry)166 parse_appended_id(char *str, acl_entry_t entry)
167 {
168 int qualifier_length;
169 char *end;
170 id_t id;
171
172 qualifier_length = strlen(str);
173 if (qualifier_length == 0) {
174 warnx("malformed ACL: \"appended id\" field present, "
175 "but empty");
176 return (-1);
177 }
178
179 id = strtod(str, &end);
180 if (end - str != qualifier_length) {
181 warnx("malformed ACL: appended id is not a number");
182 return (-1);
183 }
184
185 return (acl_set_qualifier(entry, &id));
186 }
187
188 static int
number_of_colons(const char * str)189 number_of_colons(const char *str)
190 {
191 int count = 0;
192
193 while (*str != '\0') {
194 if (*str == ':')
195 count++;
196
197 str++;
198 }
199
200 return (count);
201 }
202
203 int
_nfs4_acl_entry_from_text(acl_t aclp,char * str)204 _nfs4_acl_entry_from_text(acl_t aclp, char *str)
205 {
206 int error, need_qualifier;
207 acl_entry_t entry;
208 char *field, *qualifier_field;
209
210 error = acl_create_entry(&aclp, &entry);
211 if (error)
212 return (error);
213
214 assert(_entry_brand(entry) == ACL_BRAND_NFS4);
215
216 if (str == NULL)
217 goto truncated_entry;
218 field = strsep(&str, ":");
219
220 field = string_skip_whitespace(field);
221 if ((*field == '\0') && (!str)) {
222 /*
223 * Is an entirely comment line, skip to next
224 * comma.
225 */
226 return (0);
227 }
228
229 error = parse_tag(field, entry, &need_qualifier);
230 if (error)
231 goto malformed_field;
232
233 if (need_qualifier) {
234 if (str == NULL)
235 goto truncated_entry;
236 qualifier_field = field = strsep(&str, ":");
237 error = parse_qualifier(field, entry, &need_qualifier);
238 if (error)
239 goto malformed_field;
240 }
241
242 if (str == NULL)
243 goto truncated_entry;
244 field = strsep(&str, ":");
245 error = parse_access_mask(field, entry);
246 if (error)
247 goto malformed_field;
248
249 if (str == NULL)
250 goto truncated_entry;
251 /* Do we have "flags" field? */
252 if (number_of_colons(str) > 0) {
253 field = strsep(&str, ":");
254 error = parse_flags(field, entry);
255 if (error)
256 goto malformed_field;
257 }
258
259 if (str == NULL)
260 goto truncated_entry;
261 field = strsep(&str, ":");
262 error = parse_entry_type(field, entry);
263 if (error)
264 goto malformed_field;
265
266 if (need_qualifier) {
267 if (str == NULL) {
268 warnx("malformed ACL: unknown user or group name "
269 "\"%s\"", qualifier_field);
270 goto truncated_entry;
271 }
272
273 error = parse_appended_id(str, entry);
274 if (error)
275 goto malformed_field;
276 }
277
278 return (0);
279
280 truncated_entry:
281 malformed_field:
282 acl_delete_entry(aclp, entry);
283 errno = EINVAL;
284 return (-1);
285 }
286