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      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 http://www.opensolaris.org/os/licensing.
     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 2008 Sun Microsystems, Inc.  All rights reserved.
     23  * Use is subject to license terms.
     24  */
     25 
     26 
     27 #pragma ident	"%Z%%M%	%I%	%E% SMI"
     28 
     29 #if defined(_KERNEL)
     30 #include <sys/systm.h>
     31 #include <sys/sunddi.h>
     32 #include <sys/ctype.h>
     33 #else
     34 #include <stdio.h>
     35 #include <unistd.h>
     36 #include <strings.h>
     37 #include <libnvpair.h>
     38 #include <ctype.h>
     39 #endif
     40 /* XXX includes zfs_context.h, so why bother with the above? */
     41 #include <sys/dsl_deleg.h>
     42 #include "zfs_prop.h"
     43 #include "zfs_deleg.h"
     44 #include "zfs_namecheck.h"
     45 
     46 /*
     47  * permission table
     48  *
     49  * Keep this table in sorted order
     50  *
     51  * This table is used for displaying all permissions for
     52  * zfs allow
     53  */
     54 
     55 zfs_deleg_perm_tab_t zfs_deleg_perm_tab[] = {
     56 	{ZFS_DELEG_PERM_ALLOW, ZFS_DELEG_NOTE_ALLOW},
     57 	{ZFS_DELEG_PERM_CLONE, ZFS_DELEG_NOTE_CLONE },
     58 	{ZFS_DELEG_PERM_CREATE, ZFS_DELEG_NOTE_CREATE },
     59 	{ZFS_DELEG_PERM_DESTROY, ZFS_DELEG_NOTE_DESTROY },
     60 	{ZFS_DELEG_PERM_MOUNT, ZFS_DELEG_NOTE_MOUNT },
     61 	{ZFS_DELEG_PERM_PROMOTE, ZFS_DELEG_NOTE_PROMOTE },
     62 	{ZFS_DELEG_PERM_RECEIVE, ZFS_DELEG_NOTE_RECEIVE },
     63 	{ZFS_DELEG_PERM_RENAME, ZFS_DELEG_NOTE_RENAME },
     64 	{ZFS_DELEG_PERM_ROLLBACK, ZFS_DELEG_NOTE_ROLLBACK },
     65 	{ZFS_DELEG_PERM_SNAPSHOT, ZFS_DELEG_NOTE_SNAPSHOT },
     66 	{ZFS_DELEG_PERM_SHARE, ZFS_DELEG_NOTE_SHARE },
     67 	{ZFS_DELEG_PERM_SEND, ZFS_DELEG_NOTE_NONE },
     68 	{ZFS_DELEG_PERM_USERPROP, ZFS_DELEG_NOTE_USERPROP },
     69 	{NULL, ZFS_DELEG_NOTE_NONE }
     70 };
     71 
     72 static int
     73 zfs_valid_permission_name(const char *perm)
     74 {
     75 	if (zfs_deleg_canonicalize_perm(perm))
     76 		return (0);
     77 
     78 	return (permset_namecheck(perm, NULL, NULL));
     79 }
     80 
     81 const char *
     82 zfs_deleg_canonicalize_perm(const char *perm)
     83 {
     84 	int i;
     85 	zfs_prop_t prop;
     86 
     87 	for (i = 0; zfs_deleg_perm_tab[i].z_perm != NULL; i++) {
     88 		if (strcmp(perm, zfs_deleg_perm_tab[i].z_perm) == 0)
     89 			return (perm);
     90 	}
     91 
     92 	prop = zfs_name_to_prop(perm);
     93 	if (prop != ZPROP_INVAL && zfs_prop_delegatable(prop))
     94 		return (zfs_prop_to_name(prop));
     95 	return (NULL);
     96 
     97 }
     98 
     99 static int
    100 zfs_validate_who(char *who)
    101 {
    102 	char *p;
    103 
    104 	if (who[2] != ZFS_DELEG_FIELD_SEP_CHR)
    105 		return (-1);
    106 
    107 	switch (who[0]) {
    108 	case ZFS_DELEG_USER:
    109 	case ZFS_DELEG_GROUP:
    110 	case ZFS_DELEG_USER_SETS:
    111 	case ZFS_DELEG_GROUP_SETS:
    112 		if (who[1] != ZFS_DELEG_LOCAL && who[1] != ZFS_DELEG_DESCENDENT)
    113 			return (-1);
    114 		for (p = &who[3]; *p; p++)
    115 			if (!isdigit(*p))
    116 				return (-1);
    117 		break;
    118 
    119 	case ZFS_DELEG_NAMED_SET:
    120 	case ZFS_DELEG_NAMED_SET_SETS:
    121 		if (who[1] != ZFS_DELEG_NA)
    122 			return (-1);
    123 		return (permset_namecheck(&who[3], NULL, NULL));
    124 
    125 	case ZFS_DELEG_CREATE:
    126 	case ZFS_DELEG_CREATE_SETS:
    127 		if (who[1] != ZFS_DELEG_NA)
    128 			return (-1);
    129 		if (who[3] != '\0')
    130 			return (-1);
    131 		break;
    132 
    133 	case ZFS_DELEG_EVERYONE:
    134 	case ZFS_DELEG_EVERYONE_SETS:
    135 		if (who[1] != ZFS_DELEG_LOCAL && who[1] != ZFS_DELEG_DESCENDENT)
    136 			return (-1);
    137 		if (who[3] != '\0')
    138 			return (-1);
    139 		break;
    140 
    141 	default:
    142 		return (-1);
    143 	}
    144 
    145 	return (0);
    146 }
    147 
    148 int
    149 zfs_deleg_verify_nvlist(nvlist_t *nvp)
    150 {
    151 	nvpair_t *who, *perm_name;
    152 	nvlist_t *perms;
    153 	int error;
    154 
    155 	if (nvp == NULL)
    156 		return (-1);
    157 
    158 	who = nvlist_next_nvpair(nvp, NULL);
    159 	if (who == NULL)
    160 		return (-1);
    161 
    162 	do {
    163 		if (zfs_validate_who(nvpair_name(who)))
    164 			return (-1);
    165 
    166 		error = nvlist_lookup_nvlist(nvp, nvpair_name(who), &perms);
    167 
    168 		if (error && error != ENOENT)
    169 			return (-1);
    170 		if (error == ENOENT)
    171 			continue;
    172 
    173 		perm_name = nvlist_next_nvpair(perms, NULL);
    174 		if (perm_name == NULL) {
    175 			return (-1);
    176 		}
    177 		do {
    178 			error = zfs_valid_permission_name(
    179 			    nvpair_name(perm_name));
    180 			if (error)
    181 				return (-1);
    182 		} while (perm_name = nvlist_next_nvpair(perms, perm_name));
    183 	} while (who = nvlist_next_nvpair(nvp, who));
    184 	return (0);
    185 }
    186 
    187 /*
    188  * Construct the base attribute name.  The base attribute names
    189  * are the "key" to locate the jump objects which contain the actual
    190  * permissions.  The base attribute names are encoded based on
    191  * type of entry and whether it is a local or descendent permission.
    192  *
    193  * Arguments:
    194  * attr - attribute name return string, attribute is assumed to be
    195  *        ZFS_MAX_DELEG_NAME long.
    196  * type - type of entry to construct
    197  * inheritchr - inheritance type (local,descendent, or NA for create and
    198  *                               permission set definitions
    199  * data - is either a permission set name or a 64 bit uid/gid.
    200  */
    201 void
    202 zfs_deleg_whokey(char *attr, zfs_deleg_who_type_t type,
    203     char inheritchr, void *data)
    204 {
    205 	int len = ZFS_MAX_DELEG_NAME;
    206 	uint64_t *id = data;
    207 
    208 	switch (type) {
    209 	case ZFS_DELEG_USER:
    210 	case ZFS_DELEG_GROUP:
    211 	case ZFS_DELEG_USER_SETS:
    212 	case ZFS_DELEG_GROUP_SETS:
    213 		(void) snprintf(attr, len, "%c%c%c%lld", type, inheritchr,
    214 		    ZFS_DELEG_FIELD_SEP_CHR, (longlong_t)*id);
    215 		break;
    216 	case ZFS_DELEG_NAMED_SET_SETS:
    217 	case ZFS_DELEG_NAMED_SET:
    218 		(void) snprintf(attr, len, "%c-%c%s", type,
    219 		    ZFS_DELEG_FIELD_SEP_CHR, (char *)data);
    220 		break;
    221 	case ZFS_DELEG_CREATE:
    222 	case ZFS_DELEG_CREATE_SETS:
    223 		(void) snprintf(attr, len, "%c-%c", type,
    224 		    ZFS_DELEG_FIELD_SEP_CHR);
    225 		break;
    226 	case ZFS_DELEG_EVERYONE:
    227 	case ZFS_DELEG_EVERYONE_SETS:
    228 		(void) snprintf(attr, len, "%c%c%c", type, inheritchr,
    229 		    ZFS_DELEG_FIELD_SEP_CHR);
    230 		break;
    231 	default:
    232 		ASSERT(!"bad zfs_deleg_who_type_t");
    233 	}
    234 }
    235