usr/src/common/zfs/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_HOLD},
  67         {ZFS_DELEG_PERM_RELEASE},
  68         {NULL}
  69 };
  70
  71 static int
  72 zfs_valid_permission_name(const char *perm)
  73 {
  74         if (zfs_deleg_canonicalize_perm(perm))
  75                 return (0);
  76
  77         return (permset_namecheck(perm, NULL, NULL));
  78 }
  79
  80 const char *
  81 zfs_deleg_canonicalize_perm(const char *perm)
  82 {
  83         int i;
  84         zfs_prop_t prop;
  85
  86         for (i = 0; zfs_deleg_perm_tab[i].z_perm != NULL; i++) {
  87                 if (strcmp(perm, zfs_deleg_perm_tab[i].z_perm) == 0)
  88                         return (perm);
  89         }
  90
  91         prop = zfs_name_to_prop(perm);
  92         if (prop != ZPROP_INVAL && zfs_prop_delegatable(prop))
  93                 return (zfs_prop_to_name(prop));
  94         return (NULL);
  95
  96 }
  97
  98 static int
  99 zfs_validate_who(char *who)
 100 {
 101         char *p;
 102
 103         if (who[2] != ZFS_DELEG_FIELD_SEP_CHR)
 104                 return (-1);
 105
 106         switch (who[0]) {
 107         case ZFS_DELEG_USER:
 108         case ZFS_DELEG_GROUP:
 109         case ZFS_DELEG_USER_SETS:
 110         case ZFS_DELEG_GROUP_SETS:
 111                 if (who[1] != ZFS_DELEG_LOCAL && who[1] != ZFS_DELEG_DESCENDENT)
 112                         return (-1);
 113                 for (p = &who[3]; *p; p++)
 114                         if (!isdigit(*p))
 115                                 return (-1);
 116                 break;
 117
 118         case ZFS_DELEG_NAMED_SET:
 119         case ZFS_DELEG_NAMED_SET_SETS:
 120                 if (who[1] != ZFS_DELEG_NA)
 121                         return (-1);
 122                 return (permset_namecheck(&who[3], NULL, NULL));
 123
 124         case ZFS_DELEG_CREATE:
 125         case ZFS_DELEG_CREATE_SETS:
 126                 if (who[1] != ZFS_DELEG_NA)
 127                         return (-1);
 128                 if (who[3] != '\0')
 129                         return (-1);
 130                 break;
 131
 132         case ZFS_DELEG_EVERYONE:
 133         case ZFS_DELEG_EVERYONE_SETS:
 134                 if (who[1] != ZFS_DELEG_LOCAL && who[1] != ZFS_DELEG_DESCENDENT)
 135                         return (-1);
 136                 if (who[3] != '\0')
 137                         return (-1);
 138                 break;
 139
 140         default:
 141                 return (-1);
 142         }
 143
 144         return (0);
 145 }
 146
 147 int
 148 zfs_deleg_verify_nvlist(nvlist_t *nvp)
 149 {
 150         nvpair_t *who, *perm_name;
 151         nvlist_t *perms;
 152         int error;
 153
 154         if (nvp == NULL)
 155                 return (-1);
 156
 157         who = nvlist_next_nvpair(nvp, NULL);
 158         if (who == NULL)
 159                 return (-1);
 160
 161         do {
 162                 if (zfs_validate_who(nvpair_name(who)))
 163                         return (-1);
 164
 165                 error = nvlist_lookup_nvlist(nvp, nvpair_name(who), &perms);
 166
 167                 if (error && error != ENOENT)
 168                         return (-1);
 169                 if (error == ENOENT)
 170                         continue;
 171
 172                 perm_name = nvlist_next_nvpair(perms, NULL);
 173                 if (perm_name == NULL) {
 174                         return (-1);
 175                 }
 176                 do {
 177                         error = zfs_valid_permission_name(
 178                             nvpair_name(perm_name));
 179                         if (error)
 180                                 return (-1);
 181                 } while ((perm_name = nvlist_next_nvpair(perms, perm_name))
 182                     != NULL);
 183         } while ((who = nvlist_next_nvpair(nvp, who)) != NULL);
 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 }