1/*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or https://opensource.org/licenses/CDDL-1.0.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21/*
22 * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
23 * Copyright 2010 Nexenta Systems, Inc. All rights reserved.
24 * Copyright (c) 2013, 2015 by Delphix. All rights reserved.
25 * Copyright 2016 Igor Kozhukhov <ikozhukhov@gmail.com>
26 */
27
28#include <sys/zfs_context.h>
29
30#if defined(_KERNEL)
31#include <sys/sunddi.h>
32#include <sys/ctype.h>
33#else
34#include <stdio.h>
35#include <unistd.h>
36#include <libnvpair.h>
37#include <ctype.h>
38#endif
39#include <sys/string.h>
40#include <sys/dsl_deleg.h>
41#include "zfs_prop.h"
42#include "zfs_deleg.h"
43#include "zfs_namecheck.h"
44
45const zfs_deleg_perm_tab_t zfs_deleg_perm_tab[] = {
46	{ZFS_DELEG_PERM_ALLOW},
47	{ZFS_DELEG_PERM_BOOKMARK},
48	{ZFS_DELEG_PERM_CLONE},
49	{ZFS_DELEG_PERM_CREATE},
50	{ZFS_DELEG_PERM_DESTROY},
51	{ZFS_DELEG_PERM_DIFF},
52	{ZFS_DELEG_PERM_MOUNT},
53	{ZFS_DELEG_PERM_PROMOTE},
54	{ZFS_DELEG_PERM_RECEIVE},
55	{ZFS_DELEG_PERM_RENAME},
56	{ZFS_DELEG_PERM_ROLLBACK},
57	{ZFS_DELEG_PERM_SNAPSHOT},
58	{ZFS_DELEG_PERM_SHARE},
59	{ZFS_DELEG_PERM_SEND},
60	{ZFS_DELEG_PERM_USERPROP},
61	{ZFS_DELEG_PERM_USERQUOTA},
62	{ZFS_DELEG_PERM_GROUPQUOTA},
63	{ZFS_DELEG_PERM_USERUSED},
64	{ZFS_DELEG_PERM_GROUPUSED},
65	{ZFS_DELEG_PERM_USEROBJQUOTA},
66	{ZFS_DELEG_PERM_GROUPOBJQUOTA},
67	{ZFS_DELEG_PERM_USEROBJUSED},
68	{ZFS_DELEG_PERM_GROUPOBJUSED},
69	{ZFS_DELEG_PERM_HOLD},
70	{ZFS_DELEG_PERM_RELEASE},
71	{ZFS_DELEG_PERM_LOAD_KEY},
72	{ZFS_DELEG_PERM_CHANGE_KEY},
73	{ZFS_DELEG_PERM_PROJECTUSED},
74	{ZFS_DELEG_PERM_PROJECTQUOTA},
75	{ZFS_DELEG_PERM_PROJECTOBJUSED},
76	{ZFS_DELEG_PERM_PROJECTOBJQUOTA},
77	{NULL}
78};
79
80static int
81zfs_valid_permission_name(const char *perm)
82{
83	if (zfs_deleg_canonicalize_perm(perm))
84		return (0);
85
86	return (permset_namecheck(perm, NULL, NULL));
87}
88
89const char *
90zfs_deleg_canonicalize_perm(const char *perm)
91{
92	for (int i = 0; zfs_deleg_perm_tab[i].z_perm != NULL; i++) {
93		if (strcmp(perm, zfs_deleg_perm_tab[i].z_perm) == 0)
94			return (perm);
95	}
96
97	zfs_prop_t prop = zfs_name_to_prop(perm);
98	if (prop != ZPROP_INVAL && zfs_prop_delegatable(prop))
99		return (zfs_prop_to_name(prop));
100	return (NULL);
101
102}
103
104static int
105zfs_validate_who(const char *who)
106{
107	const char *p;
108
109	if (who[2] != ZFS_DELEG_FIELD_SEP_CHR)
110		return (-1);
111
112	switch (who[0]) {
113	case ZFS_DELEG_USER:
114	case ZFS_DELEG_GROUP:
115	case ZFS_DELEG_USER_SETS:
116	case ZFS_DELEG_GROUP_SETS:
117		if (who[1] != ZFS_DELEG_LOCAL && who[1] != ZFS_DELEG_DESCENDENT)
118			return (-1);
119		for (p = &who[3]; *p; p++)
120			if (!isdigit(*p))
121				return (-1);
122		break;
123
124	case ZFS_DELEG_NAMED_SET:
125	case ZFS_DELEG_NAMED_SET_SETS:
126		if (who[1] != ZFS_DELEG_NA)
127			return (-1);
128		return (permset_namecheck(&who[3], NULL, NULL));
129
130	case ZFS_DELEG_CREATE:
131	case ZFS_DELEG_CREATE_SETS:
132		if (who[1] != ZFS_DELEG_NA)
133			return (-1);
134		if (who[3] != '\0')
135			return (-1);
136		break;
137
138	case ZFS_DELEG_EVERYONE:
139	case ZFS_DELEG_EVERYONE_SETS:
140		if (who[1] != ZFS_DELEG_LOCAL && who[1] != ZFS_DELEG_DESCENDENT)
141			return (-1);
142		if (who[3] != '\0')
143			return (-1);
144		break;
145
146	default:
147		return (-1);
148	}
149
150	return (0);
151}
152
153int
154zfs_deleg_verify_nvlist(nvlist_t *nvp)
155{
156	nvpair_t *who, *perm_name;
157	nvlist_t *perms;
158	int error;
159
160	if (nvp == NULL)
161		return (-1);
162
163	who = nvlist_next_nvpair(nvp, NULL);
164	if (who == NULL)
165		return (-1);
166
167	do {
168		if (zfs_validate_who(nvpair_name(who)))
169			return (-1);
170
171		error = nvlist_lookup_nvlist(nvp, nvpair_name(who), &perms);
172
173		if (error && error != ENOENT)
174			return (-1);
175		if (error == ENOENT)
176			continue;
177
178		perm_name = nvlist_next_nvpair(perms, NULL);
179		if (perm_name == NULL) {
180			return (-1);
181		}
182		do {
183			error = zfs_valid_permission_name(
184			    nvpair_name(perm_name));
185			if (error)
186				return (-1);
187		} while ((perm_name = nvlist_next_nvpair(perms, perm_name))
188		    != NULL);
189	} while ((who = nvlist_next_nvpair(nvp, who)) != NULL);
190	return (0);
191}
192
193/*
194 * Construct the base attribute name.  The base attribute names
195 * are the "key" to locate the jump objects which contain the actual
196 * permissions.  The base attribute names are encoded based on
197 * type of entry and whether it is a local or descendent permission.
198 *
199 * Arguments:
200 * attr - attribute name return string, attribute is assumed to be
201 *        ZFS_MAX_DELEG_NAME long.
202 * type - type of entry to construct
203 * inheritchr - inheritance type (local,descendent, or NA for create and
204 *                               permission set definitions
205 * data - is either a permission set name or a 64 bit uid/gid.
206 */
207void
208zfs_deleg_whokey(char *attr, zfs_deleg_who_type_t type,
209    char inheritchr, void *data)
210{
211	int len = ZFS_MAX_DELEG_NAME;
212	uint64_t *id = data;
213
214	switch (type) {
215	case ZFS_DELEG_USER:
216	case ZFS_DELEG_GROUP:
217	case ZFS_DELEG_USER_SETS:
218	case ZFS_DELEG_GROUP_SETS:
219		(void) snprintf(attr, len, "%c%c%c%lld", type, inheritchr,
220		    ZFS_DELEG_FIELD_SEP_CHR, (longlong_t)*id);
221		break;
222	case ZFS_DELEG_NAMED_SET_SETS:
223	case ZFS_DELEG_NAMED_SET:
224		(void) snprintf(attr, len, "%c-%c%s", type,
225		    ZFS_DELEG_FIELD_SEP_CHR, (char *)data);
226		break;
227	case ZFS_DELEG_CREATE:
228	case ZFS_DELEG_CREATE_SETS:
229		(void) snprintf(attr, len, "%c-%c", type,
230		    ZFS_DELEG_FIELD_SEP_CHR);
231		break;
232	case ZFS_DELEG_EVERYONE:
233	case ZFS_DELEG_EVERYONE_SETS:
234		(void) snprintf(attr, len, "%c%c%c", type, inheritchr,
235		    ZFS_DELEG_FIELD_SEP_CHR);
236		break;
237	default:
238		ASSERT(!"bad zfs_deleg_who_type_t");
239	}
240}
241
242#if defined(_KERNEL)
243EXPORT_SYMBOL(zfs_deleg_verify_nvlist);
244EXPORT_SYMBOL(zfs_deleg_whokey);
245EXPORT_SYMBOL(zfs_deleg_canonicalize_perm);
246#endif
247