sys/cddl/compat/opensolaris/kern/opensolaris_acl.c

   1 /*-
   2  * Copyright (c) 2008, 2009 Edward Tomasz Napierała <trasz@FreeBSD.org>
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  */
  26
  27 #include <sys/cdefs.h>
  28 __FBSDID("$FreeBSD$");
  29
  30 #include <sys/param.h>
  31 #include <sys/systm.h>
  32 #include <sys/types.h>
  33 #include <sys/malloc.h>
  34 #include <sys/errno.h>
  35 #include <sys/zfs_acl.h>
  36 #include <sys/acl.h>
  37
  38 struct zfs2bsd {
  39         uint32_t        zb_zfs;
  40         int             zb_bsd;
  41 };
  42
  43 struct zfs2bsd perms[] = {{ACE_READ_DATA, ACL_READ_DATA},
  44                         {ACE_WRITE_DATA, ACL_WRITE_DATA},
  45                         {ACE_EXECUTE, ACL_EXECUTE},
  46                         {ACE_APPEND_DATA, ACL_APPEND_DATA},
  47                         {ACE_DELETE_CHILD, ACL_DELETE_CHILD},
  48                         {ACE_DELETE, ACL_DELETE},
  49                         {ACE_READ_ATTRIBUTES, ACL_READ_ATTRIBUTES},
  50                         {ACE_WRITE_ATTRIBUTES, ACL_WRITE_ATTRIBUTES},
  51                         {ACE_READ_NAMED_ATTRS, ACL_READ_NAMED_ATTRS},
  52                         {ACE_WRITE_NAMED_ATTRS, ACL_WRITE_NAMED_ATTRS},
  53                         {ACE_READ_ACL, ACL_READ_ACL},
  54                         {ACE_WRITE_ACL, ACL_WRITE_ACL},
  55                         {ACE_WRITE_OWNER, ACL_WRITE_OWNER},
  56                         {ACE_SYNCHRONIZE, ACL_SYNCHRONIZE},
  57                         {0, 0}};
  58
  59 struct zfs2bsd flags[] = {{ACE_FILE_INHERIT_ACE,
  60                             ACL_ENTRY_FILE_INHERIT},
  61                         {ACE_DIRECTORY_INHERIT_ACE,
  62                             ACL_ENTRY_DIRECTORY_INHERIT},
  63                         {ACE_NO_PROPAGATE_INHERIT_ACE,
  64                             ACL_ENTRY_NO_PROPAGATE_INHERIT},
  65                         {ACE_INHERIT_ONLY_ACE,
  66                             ACL_ENTRY_INHERIT_ONLY},
  67                         {ACE_SUCCESSFUL_ACCESS_ACE_FLAG,
  68                             ACL_ENTRY_SUCCESSFUL_ACCESS},
  69                         {ACE_FAILED_ACCESS_ACE_FLAG,
  70                             ACL_ENTRY_FAILED_ACCESS},
  71                         {0, 0}};
  72
  73 static int
  74 _bsd_from_zfs(uint32_t zfs, const struct zfs2bsd *table)
  75 {
  76         const struct zfs2bsd *tmp;
  77         int bsd = 0;
  78
  79         for (tmp = table; tmp->zb_zfs != 0; tmp++) {
  80                 if (zfs & tmp->zb_zfs)
  81                         bsd |= tmp->zb_bsd;
  82         }
  83
  84         return (bsd);
  85 }
  86
  87 static uint32_t
  88 _zfs_from_bsd(int bsd, const struct zfs2bsd *table)
  89 {
  90         const struct zfs2bsd *tmp;
  91         uint32_t zfs = 0;
  92
  93         for (tmp = table; tmp->zb_bsd != 0; tmp++) {
  94                 if (bsd & tmp->zb_bsd)
  95                         zfs |= tmp->zb_zfs;
  96         }
  97
  98         return (zfs);
  99 }
 100
 101 int
 102 acl_from_aces(struct acl *aclp, const ace_t *aces, int nentries)
 103 {
 104         int i;
 105         struct acl_entry *entry;
 106         const ace_t *ace;
 107
 108         KASSERT(nentries >= 1, ("empty ZFS ACL"));
 109
 110         if (nentries > ACL_MAX_ENTRIES) {
 111                 /*
 112                  * I believe it may happen only when moving a pool
 113                  * from SunOS to FreeBSD.
 114                  */
 115                 printf("acl_from_aces: ZFS ACL too big to fit "
 116                     "into 'struct acl'; returning EINVAL.\n");
 117                 return (EINVAL);
 118         }
 119
 120         bzero(aclp, sizeof(*aclp));
 121         aclp->acl_maxcnt = ACL_MAX_ENTRIES;
 122         aclp->acl_cnt = nentries;
 123
 124         for (i = 0; i < nentries; i++) {
 125                 entry = &(aclp->acl_entry[i]);
 126                 ace = &(aces[i]);
 127
 128                 if (ace->a_flags & ACE_OWNER)
 129                         entry->ae_tag = ACL_USER_OBJ;
 130                 else if (ace->a_flags & ACE_GROUP)
 131                         entry->ae_tag = ACL_GROUP_OBJ;
 132                 else if (ace->a_flags & ACE_EVERYONE)
 133                         entry->ae_tag = ACL_EVERYONE;
 134                 else if (ace->a_flags & ACE_IDENTIFIER_GROUP)
 135                         entry->ae_tag = ACL_GROUP;
 136                 else
 137                         entry->ae_tag = ACL_USER;
 138
 139                 if (entry->ae_tag == ACL_USER || entry->ae_tag == ACL_GROUP)
 140                         entry->ae_id = ace->a_who;
 141                 else
 142                         entry->ae_id = ACL_UNDEFINED_ID;
 143
 144                 entry->ae_perm = _bsd_from_zfs(ace->a_access_mask, perms);
 145                 entry->ae_flags = _bsd_from_zfs(ace->a_flags, flags);
 146
 147                 switch (ace->a_type) {
 148                 case ACE_ACCESS_ALLOWED_ACE_TYPE:
 149                         entry->ae_entry_type = ACL_ENTRY_TYPE_ALLOW;
 150                         break;
 151                 case ACE_ACCESS_DENIED_ACE_TYPE:
 152                         entry->ae_entry_type = ACL_ENTRY_TYPE_DENY;
 153                         break;
 154                 case ACE_SYSTEM_AUDIT_ACE_TYPE:
 155                         entry->ae_entry_type = ACL_ENTRY_TYPE_AUDIT;
 156                         break;
 157                 case ACE_SYSTEM_ALARM_ACE_TYPE:
 158                         entry->ae_entry_type = ACL_ENTRY_TYPE_ALARM;
 159                         break;
 160                 default:
 161                         panic("acl_from_aces: a_type is 0x%x", ace->a_type);
 162                 }
 163         }
 164
 165         return (0);
 166 }
 167
 168 void
 169 aces_from_acl(ace_t *aces, int *nentries, const struct acl *aclp)
 170 {
 171         int i;
 172         const struct acl_entry *entry;
 173         ace_t *ace;
 174
 175         bzero(aces, sizeof(*aces) * aclp->acl_cnt);
 176
 177         *nentries = aclp->acl_cnt;
 178
 179         for (i = 0; i < aclp->acl_cnt; i++) {
 180                 entry = &(aclp->acl_entry[i]);
 181                 ace = &(aces[i]);
 182
 183                 ace->a_who = entry->ae_id;
 184
 185                 if (entry->ae_tag == ACL_USER_OBJ)
 186                         ace->a_flags = ACE_OWNER;
 187                 else if (entry->ae_tag == ACL_GROUP_OBJ)
 188                         ace->a_flags = (ACE_GROUP | ACE_IDENTIFIER_GROUP);
 189                 else if (entry->ae_tag == ACL_GROUP)
 190                         ace->a_flags = ACE_IDENTIFIER_GROUP;
 191                 else if (entry->ae_tag == ACL_EVERYONE)
 192                         ace->a_flags = ACE_EVERYONE;
 193                 else /* ACL_USER */
 194                         ace->a_flags = 0;
 195
 196                 ace->a_access_mask = _zfs_from_bsd(entry->ae_perm, perms);
 197                 ace->a_flags |= _zfs_from_bsd(entry->ae_flags, flags);
 198
 199                 switch (entry->ae_entry_type) {
 200                 case ACL_ENTRY_TYPE_ALLOW:
 201                         ace->a_type = ACE_ACCESS_ALLOWED_ACE_TYPE;
 202                         break;
 203                 case ACL_ENTRY_TYPE_DENY:
 204                         ace->a_type = ACE_ACCESS_DENIED_ACE_TYPE;
 205                         break;
 206                 case ACL_ENTRY_TYPE_ALARM:
 207                         ace->a_type = ACE_SYSTEM_ALARM_ACE_TYPE;
 208                         break;
 209                 case ACL_ENTRY_TYPE_AUDIT:
 210                         ace->a_type = ACE_SYSTEM_AUDIT_ACE_TYPE;
 211                         break;
 212                 default:
 213                         panic("aces_from_acl: ae_entry_type is 0x%x", entry->ae_entry_type);
 214                 }
 215         }
 216 }