zfs/module/zcommon/zfs_deleg.c

   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 (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
  23  * Copyright 2010 Nexenta Systems, Inc. All rights reserved.
  24  * Copyright (c) 2013 by Delphix. All rights reserved.
  25  */
  26
  27 #include <sys/zfs_context.h>
  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 #include <sys/dsl_deleg.h>
  41 #include "zfs_prop.h"
  42 #include "zfs_deleg.h"
  43 #include "zfs_namecheck.h"
  44
  45 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_HOLD},
  66         {ZFS_DELEG_PERM_RELEASE},
  67         {NULL}
  68 };
  69
  70 static int
  71 zfs_valid_permission_name(const char *perm)
  72 {
  73         if (zfs_deleg_canonicalize_perm(perm))
  74                 return (0);
  75
  76         return (permset_namecheck(perm, NULL, NULL));
  77 }
  78
  79 const char *
  80 zfs_deleg_canonicalize_perm(const char *perm)
  81 {
  82         int i;
  83         zfs_prop_t prop;
  84
  85         for (i = 0; zfs_deleg_perm_tab[i].z_perm != NULL; i++) {
  86                 if (strcmp(perm, zfs_deleg_perm_tab[i].z_perm) == 0)
  87                         return (perm);
  88         }
  89
  90         prop = zfs_name_to_prop(perm);
  91         if (prop != ZPROP_INVAL && zfs_prop_delegatable(prop))
  92                 return (zfs_prop_to_name(prop));
  93         return (NULL);
  94
  95 }
  96
  97 static int
  98 zfs_validate_who(char *who)
  99 {
 100         char *p;
 101
 102         if (who[2] != ZFS_DELEG_FIELD_SEP_CHR)
 103                 return (-1);
 104
 105         switch (who[0]) {
 106         case ZFS_DELEG_USER:
 107         case ZFS_DELEG_GROUP:
 108         case ZFS_DELEG_USER_SETS:
 109         case ZFS_DELEG_GROUP_SETS:
 110                 if (who[1] != ZFS_DELEG_LOCAL && who[1] != ZFS_DELEG_DESCENDENT)
 111                         return (-1);
 112                 for (p = &who[3]; *p; p++)
 113                         if (!isdigit(*p))
 114                                 return (-1);
 115                 break;
 116
 117         case ZFS_DELEG_NAMED_SET:
 118         case ZFS_DELEG_NAMED_SET_SETS:
 119                 if (who[1] != ZFS_DELEG_NA)
 120                         return (-1);
 121                 return (permset_namecheck(&who[3], NULL, NULL));
 122
 123         case ZFS_DELEG_CREATE:
 124         case ZFS_DELEG_CREATE_SETS:
 125                 if (who[1] != ZFS_DELEG_NA)
 126                         return (-1);
 127                 if (who[3] != '\0')
 128                         return (-1);
 129                 break;
 130
 131         case ZFS_DELEG_EVERYONE:
 132         case ZFS_DELEG_EVERYONE_SETS:
 133                 if (who[1] != ZFS_DELEG_LOCAL && who[1] != ZFS_DELEG_DESCENDENT)
 134                         return (-1);
 135                 if (who[3] != '\0')
 136                         return (-1);
 137                 break;
 138
 139         default:
 140                 return (-1);
 141         }
 142
 143         return (0);
 144 }
 145
 146 int
 147 zfs_deleg_verify_nvlist(nvlist_t *nvp)
 148 {
 149         nvpair_t *who, *perm_name;
 150         nvlist_t *perms;
 151         int error;
 152
 153         if (nvp == NULL)
 154                 return (-1);
 155
 156         who = nvlist_next_nvpair(nvp, NULL);
 157         if (who == NULL)
 158                 return (-1);
 159
 160         do {
 161                 if (zfs_validate_who(nvpair_name(who)))
 162                         return (-1);
 163
 164                 error = nvlist_lookup_nvlist(nvp, nvpair_name(who), &perms);
 165
 166                 if (error && error != ENOENT)
 167                         return (-1);
 168                 if (error == ENOENT)
 169                         continue;
 170
 171                 perm_name = nvlist_next_nvpair(perms, NULL);
 172                 if (perm_name == NULL) {
 173                         return (-1);
 174                 }
 175                 do {
 176                         error = zfs_valid_permission_name(
 177                             nvpair_name(perm_name));
 178                         if (error)
 179                                 return (-1);
 180                 } while ((perm_name = nvlist_next_nvpair(perms, perm_name)));
 181         } while ((who = nvlist_next_nvpair(nvp, who)));
 182         return (0);
 183 }
 184
 185 /*
 186  * Construct the base attribute name.  The base attribute names
 187  * are the "key" to locate the jump objects which contain the actual
 188  * permissions.  The base attribute names are encoded based on
 189  * type of entry and whether it is a local or descendent permission.
 190  *
 191  * Arguments:
 192  * attr - attribute name return string, attribute is assumed to be
 193  *        ZFS_MAX_DELEG_NAME long.
 194  * type - type of entry to construct
 195  * inheritchr - inheritance type (local,descendent, or NA for create and
 196  *                               permission set definitions
 197  * data - is either a permission set name or a 64 bit uid/gid.
 198  */
 199 void
 200 zfs_deleg_whokey(char *attr, zfs_deleg_who_type_t type,
 201     char inheritchr, void *data)
 202 {
 203         int len = ZFS_MAX_DELEG_NAME;
 204         uint64_t *id = data;
 205
 206         switch (type) {
 207         case ZFS_DELEG_USER:
 208         case ZFS_DELEG_GROUP:
 209         case ZFS_DELEG_USER_SETS:
 210         case ZFS_DELEG_GROUP_SETS:
 211                 (void) snprintf(attr, len, "%c%c%c%lld", type, inheritchr,
 212                     ZFS_DELEG_FIELD_SEP_CHR, (longlong_t)*id);
 213                 break;
 214         case ZFS_DELEG_NAMED_SET_SETS:
 215         case ZFS_DELEG_NAMED_SET:
 216                 (void) snprintf(attr, len, "%c-%c%s", type,
 217                     ZFS_DELEG_FIELD_SEP_CHR, (char *)data);
 218                 break;
 219         case ZFS_DELEG_CREATE:
 220         case ZFS_DELEG_CREATE_SETS:
 221                 (void) snprintf(attr, len, "%c-%c", type,
 222                     ZFS_DELEG_FIELD_SEP_CHR);
 223                 break;
 224         case ZFS_DELEG_EVERYONE:
 225         case ZFS_DELEG_EVERYONE_SETS:
 226                 (void) snprintf(attr, len, "%c%c%c", type, inheritchr,
 227                     ZFS_DELEG_FIELD_SEP_CHR);
 228                 break;
 229         default:
 230                 cmn_err(CE_PANIC, "bad zfs_deleg_who_type_t %d", type);
 231         }
 232 }
 233
 234 #if defined(_KERNEL) && defined(HAVE_SPL)
 235 EXPORT_SYMBOL(zfs_deleg_verify_nvlist);
 236 EXPORT_SYMBOL(zfs_deleg_whokey);
 237 EXPORT_SYMBOL(zfs_deleg_canonicalize_perm);
 238 #endif