1/*-
2 * Copyright (c) 2008, 2009 Edward Tomasz Napierała <trasz@FreeBSD.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD$");
29
30#include <stdio.h>
31#include <stdlib.h>
32#include <string.h>
33#include <assert.h>
34#include <err.h>
35#include <sys/acl.h>
36#include "acl_support.h"
37
38struct flagnames_struct {
39	uint32_t	flag;
40	const char	*name;
41	char		letter;
42};
43
44struct flagnames_struct a_flags[] =
45    {{ ACL_ENTRY_FILE_INHERIT, "file_inherit", 'f'},
46     { ACL_ENTRY_DIRECTORY_INHERIT, "dir_inherit", 'd'},
47     { ACL_ENTRY_INHERIT_ONLY, "inherit_only", 'i'},
48     { ACL_ENTRY_NO_PROPAGATE_INHERIT, "no_propagate", 'n'},
49     { ACL_ENTRY_SUCCESSFUL_ACCESS, "successfull_access", 'S'},
50     { ACL_ENTRY_FAILED_ACCESS, "failed_access", 'F'},
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
58struct 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
79static const char *
80format_flag(uint32_t *var, const struct flagnames_struct *flags)
81{
82
83	for (; flags->name != 0; 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
94static int
95format_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
118static int
119format_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
137static int
138parse_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;
144
145	str = strdup(strp);
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(str);
168			return (-1);
169		}
170	}
171
172	free(str);
173	return (0);
174}
175
176static int
177parse_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
210int
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
220int
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
230int
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
245int
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