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  * Copyright 2016 Igor Kozhukhov <ikozhukhov@gmail.com>
  26  */
  27
  28 #include <sys/zfs_context.h>
  29
  30 #if defined(_KERNEL)
  31 #include <sys/systm.h>
  32 #include <sys/sunddi.h>
  33 #include <sys/ctype.h>
  34 #else
  35 #include <stdio.h>
  36 #include <unistd.h>
  37 #include <strings.h>
  38 #include <libnvpair.h>
  39 #include <ctype.h>
  40 #endif
  41 #include <sys/dsl_deleg.h>
  42 #include "zfs_prop.h"
  43 #include "zfs_deleg.h"
  44 #include "zfs_namecheck.h"
  45
  46 zfs_deleg_perm_tab_t zfs_deleg_perm_tab[] = {
  47         {ZFS_DELEG_PERM_ALLOW},
  48         {ZFS_DELEG_PERM_BOOKMARK},
  49         {ZFS_DELEG_PERM_CLONE},
  50         {ZFS_DELEG_PERM_CREATE},
  51         {ZFS_DELEG_PERM_DESTROY},
  52         {ZFS_DELEG_PERM_DIFF},
  53         {ZFS_DELEG_PERM_MOUNT},
  54         {ZFS_DELEG_PERM_PROMOTE},
  55         {ZFS_DELEG_PERM_RECEIVE},
  56         {ZFS_DELEG_PERM_RENAME},
  57         {ZFS_DELEG_PERM_ROLLBACK},
  58         {ZFS_DELEG_PERM_SNAPSHOT},
  59         {ZFS_DELEG_PERM_SHARE},
  60         {ZFS_DELEG_PERM_SEND},
  61         {ZFS_DELEG_PERM_USERPROP},
  62         {ZFS_DELEG_PERM_USERQUOTA},
  63         {ZFS_DELEG_PERM_GROUPQUOTA},
  64         {ZFS_DELEG_PERM_USERUSED},
  65         {ZFS_DELEG_PERM_GROUPUSED},
  66         {ZFS_DELEG_PERM_USEROBJQUOTA},
  67         {ZFS_DELEG_PERM_GROUPOBJQUOTA},
  68         {ZFS_DELEG_PERM_USEROBJUSED},
  69         {ZFS_DELEG_PERM_GROUPOBJUSED},
  70         {ZFS_DELEG_PERM_HOLD},
  71         {ZFS_DELEG_PERM_RELEASE},
  72         {NULL}
  73 };
  74
  75 static int
  76 zfs_valid_permission_name(const char *perm)
  77 {
  78         if (zfs_deleg_canonicalize_perm(perm))
  79                 return (0);
  80
  81         return (permset_namecheck(perm, NULL, NULL));
  82 }
  83
  84 const char *
  85 zfs_deleg_canonicalize_perm(const char *perm)
  86 {
  87         int i;
  88         zfs_prop_t prop;
  89
  90         for (i = 0; zfs_deleg_perm_tab[i].z_perm != NULL; i++) {
  91                 if (strcmp(perm, zfs_deleg_perm_tab[i].z_perm) == 0)
  92                         return (perm);
  93         }
  94
  95         prop = zfs_name_to_prop(perm);
  96         if (prop != ZPROP_INVAL && zfs_prop_delegatable(prop))
  97                 return (zfs_prop_to_name(prop));
  98         return (NULL);
  99
 100 }
 101
 102 static int
 103 zfs_validate_who(char *who)
 104 {
 105         char *p;
 106
 107         if (who[2] != ZFS_DELEG_FIELD_SEP_CHR)
 108                 return (-1);
 109
 110         switch (who[0]) {
 111         case ZFS_DELEG_USER:
 112         case ZFS_DELEG_GROUP:
 113         case ZFS_DELEG_USER_SETS:
 114         case ZFS_DELEG_GROUP_SETS:
 115                 if (who[1] != ZFS_DELEG_LOCAL && who[1] != ZFS_DELEG_DESCENDENT)
 116                         return (-1);
 117                 for (p = &who[3]; *p; p++)
 118                         if (!isdigit(*p))
 119                                 return (-1);
 120                 break;
 121
 122         case ZFS_DELEG_NAMED_SET:
 123         case ZFS_DELEG_NAMED_SET_SETS:
 124                 if (who[1] != ZFS_DELEG_NA)
 125                         return (-1);
 126                 return (permset_namecheck(&who[3], NULL, NULL));
 127
 128         case ZFS_DELEG_CREATE:
 129         case ZFS_DELEG_CREATE_SETS:
 130                 if (who[1] != ZFS_DELEG_NA)
 131                         return (-1);
 132                 if (who[3] != '\0')
 133                         return (-1);
 134                 break;
 135
 136         case ZFS_DELEG_EVERYONE:
 137         case ZFS_DELEG_EVERYONE_SETS:
 138                 if (who[1] != ZFS_DELEG_LOCAL && who[1] != ZFS_DELEG_DESCENDENT)
 139                         return (-1);
 140                 if (who[3] != '\0')
 141                         return (-1);
 142                 break;
 143
 144         default:
 145                 return (-1);
 146         }
 147
 148         return (0);
 149 }
 150
 151 int
 152 zfs_deleg_verify_nvlist(nvlist_t *nvp)
 153 {
 154         nvpair_t *who, *perm_name;
 155         nvlist_t *perms;
 156         int error;
 157
 158         if (nvp == NULL)
 159                 return (-1);
 160
 161         who = nvlist_next_nvpair(nvp, NULL);
 162         if (who == NULL)
 163                 return (-1);
 164
 165         do {
 166                 if (zfs_validate_who(nvpair_name(who)))
 167                         return (-1);
 168
 169                 error = nvlist_lookup_nvlist(nvp, nvpair_name(who), &perms);
 170
 171                 if (error && error != ENOENT)
 172                         return (-1);
 173                 if (error == ENOENT)
 174                         continue;
 175
 176                 perm_name = nvlist_next_nvpair(perms, NULL);
 177                 if (perm_name == NULL) {
 178                         return (-1);
 179                 }
 180                 do {
 181                         error = zfs_valid_permission_name(
 182                             nvpair_name(perm_name));
 183                         if (error)
 184                                 return (-1);
 185                 } while ((perm_name = nvlist_next_nvpair(perms, perm_name))
 186                     != NULL);
 187         } while ((who = nvlist_next_nvpair(nvp, who)) != NULL);
 188         return (0);
 189 }
 190
 191 /*
 192  * Construct the base attribute name.  The base attribute names
 193  * are the "key" to locate the jump objects which contain the actual
 194  * permissions.  The base attribute names are encoded based on
 195  * type of entry and whether it is a local or descendent permission.
 196  *
 197  * Arguments:
 198  * attr - attribute name return string, attribute is assumed to be
 199  *        ZFS_MAX_DELEG_NAME long.
 200  * type - type of entry to construct
 201  * inheritchr - inheritance type (local,descendent, or NA for create and
 202  *                               permission set definitions
 203  * data - is either a permission set name or a 64 bit uid/gid.
 204  */
 205 void
 206 zfs_deleg_whokey(char *attr, zfs_deleg_who_type_t type,
 207     char inheritchr, void *data)
 208 {
 209         int len = ZFS_MAX_DELEG_NAME;
 210         uint64_t *id = data;
 211
 212         switch (type) {
 213         case ZFS_DELEG_USER:
 214         case ZFS_DELEG_GROUP:
 215         case ZFS_DELEG_USER_SETS:
 216         case ZFS_DELEG_GROUP_SETS:
 217                 (void) snprintf(attr, len, "%c%c%c%lld", type, inheritchr,
 218                     ZFS_DELEG_FIELD_SEP_CHR, (longlong_t)*id);
 219                 break;
 220         case ZFS_DELEG_NAMED_SET_SETS:
 221         case ZFS_DELEG_NAMED_SET:
 222                 (void) snprintf(attr, len, "%c-%c%s", type,
 223                     ZFS_DELEG_FIELD_SEP_CHR, (char *)data);
 224                 break;
 225         case ZFS_DELEG_CREATE:
 226         case ZFS_DELEG_CREATE_SETS:
 227                 (void) snprintf(attr, len, "%c-%c", type,
 228                     ZFS_DELEG_FIELD_SEP_CHR);
 229                 break;
 230         case ZFS_DELEG_EVERYONE:
 231         case ZFS_DELEG_EVERYONE_SETS:
 232                 (void) snprintf(attr, len, "%c%c%c", type, inheritchr,
 233                     ZFS_DELEG_FIELD_SEP_CHR);
 234                 break;
 235         default:
 236                 cmn_err(CE_PANIC, "bad zfs_deleg_who_type_t %d", type);
 237         }
 238 }
 239
 240 #if defined(_KERNEL) && defined(HAVE_SPL)
 241 EXPORT_SYMBOL(zfs_deleg_verify_nvlist);
 242 EXPORT_SYMBOL(zfs_deleg_whokey);
 243 EXPORT_SYMBOL(zfs_deleg_canonicalize_perm);
 244 #endif