source/modules/vfs_zfsacl.c

   1 /*
   2  * Convert ZFS/NFSv4 acls to NT acls and vice versa.
   3  *
   4  * Copyright (C) Jiri Sasek, 2007
   5  * based on the foobar.c module which is copyrighted by Volker Lendecke
   6  *
   7  * Many thanks to Axel Apitz for help to fix the special ace's handling
   8  * issues.
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 3 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  22  *
  23  */
  24
  25 #include "includes.h"
  26 #include "nfs4_acls.h"
  27
  28 #undef DBGC_CLASS
  29 #define DBGC_CLASS DBGC_VFS
  30
  31 #define ZFSACL_MODULE_NAME "zfsacl"
  32
  33 /* zfs_get_nt_acl()
  34  * read the local file's acls and return it in NT form
  35  * using the NFSv4 format conversion
  36  */
  37 static NTSTATUS zfs_get_nt_acl_common(const char *name,
  38                                       uint32 security_info,
  39                                       SMB4ACL_T **ppacl)
  40 {
  41         int naces, i;
  42         ace_t *acebuf;
  43         SMB4ACL_T *pacl;
  44         TALLOC_CTX      *mem_ctx;
  45
  46         /* read the number of file aces */
  47         if((naces = acl(name, ACE_GETACLCNT, 0, NULL)) == -1) {
  48                 if(errno == ENOSYS) {
  49                         DEBUG(9, ("acl(ACE_GETACLCNT, %s): Operation is not "
  50                                   "supported on the filesystem where the file "
  51                                   "reside", name));
  52                 } else {
  53                         DEBUG(9, ("acl(ACE_GETACLCNT, %s): %s ", name,
  54                                         strerror(errno)));
  55                 }
  56                 return map_nt_error_from_unix(errno);
  57         }
  58         /* allocate the field of ZFS aces */
  59         mem_ctx = talloc_tos();
  60         acebuf = (ace_t *) talloc_size(mem_ctx, sizeof(ace_t)*naces);
  61         if(acebuf == NULL) {
  62                 return NT_STATUS_NO_MEMORY;
  63         }
  64         /* read the aces into the field */
  65         if(acl(name, ACE_GETACL, naces, acebuf) < 0) {
  66                 DEBUG(9, ("acl(ACE_GETACL, %s): %s ", name,
  67                                 strerror(errno)));
  68                 return map_nt_error_from_unix(errno);
  69         }
  70         /* create SMB4ACL data */
  71         if((pacl = smb_create_smb4acl()) == NULL) {
  72                 return NT_STATUS_NO_MEMORY;
  73         }
  74         for(i=0; i<naces; i++) {
  75                 SMB_ACE4PROP_T aceprop;
  76
  77                 aceprop.aceType  = (uint32) acebuf[i].a_type;
  78                 aceprop.aceFlags = (uint32) acebuf[i].a_flags;
  79                 aceprop.aceMask  = (uint32) acebuf[i].a_access_mask;
  80                 aceprop.who.id   = (uint32) acebuf[i].a_who;
  81
  82                 if(aceprop.aceFlags & ACE_OWNER) {
  83                         aceprop.flags = SMB_ACE4_ID_SPECIAL;
  84                         aceprop.who.special_id = SMB_ACE4_WHO_OWNER;
  85                 } else if(aceprop.aceFlags & ACE_GROUP) {
  86                         aceprop.flags = SMB_ACE4_ID_SPECIAL;
  87                         aceprop.who.special_id = SMB_ACE4_WHO_GROUP;
  88                 } else if(aceprop.aceFlags & ACE_EVERYONE) {
  89                         aceprop.flags = SMB_ACE4_ID_SPECIAL;
  90                         aceprop.who.special_id = SMB_ACE4_WHO_EVERYONE;
  91                 } else {
  92                         aceprop.flags   = 0;
  93                 }
  94                 if(smb_add_ace4(pacl, &aceprop) == NULL)
  95                         return NT_STATUS_NO_MEMORY;
  96         }
  97
  98         *ppacl = pacl;
  99         return NT_STATUS_OK;
 100 }
 101
 102 /* call-back function processing the NT acl -> ZFS acl using NFSv4 conv. */
 103 static bool zfs_process_smbacl(files_struct *fsp, SMB4ACL_T *smbacl)
 104 {
 105         int naces = smb_get_naces(smbacl), i;
 106         ace_t *acebuf;
 107         SMB4ACE_T *smbace;
 108         TALLOC_CTX      *mem_ctx;
 109
 110         /* allocate the field of ZFS aces */
 111         mem_ctx = talloc_tos();
 112         acebuf = (ace_t *) talloc_size(mem_ctx, sizeof(ace_t)*naces);
 113         if(acebuf == NULL) {
 114                 errno = ENOMEM;
 115                 return False;
 116         }
 117         /* handle all aces */
 118         for(smbace = smb_first_ace4(smbacl), i = 0;
 119                         smbace!=NULL;
 120                         smbace = smb_next_ace4(smbace), i++) {
 121                 SMB_ACE4PROP_T *aceprop = smb_get_ace4(smbace);
 122
 123                 acebuf[i].a_type        = aceprop->aceType;
 124                 acebuf[i].a_flags       = aceprop->aceFlags;
 125                 acebuf[i].a_access_mask = aceprop->aceMask;
 126                 acebuf[i].a_who         = aceprop->who.id;
 127                 if(aceprop->flags & SMB_ACE4_ID_SPECIAL) {
 128                         switch(aceprop->who.special_id) {
 129                         case SMB_ACE4_WHO_EVERYONE:
 130                                 acebuf[i].a_flags |= ACE_EVERYONE;
 131                                 break;
 132                         case SMB_ACE4_WHO_OWNER:
 133                                 acebuf[i].a_flags |= ACE_OWNER;
 134                                 break;
 135                         case SMB_ACE4_WHO_GROUP:
 136                                 acebuf[i].a_flags |= ACE_GROUP;
 137                                 break;
 138                         default:
 139                                 DEBUG(8, ("unsupported special_id %d\n", \
 140                                         aceprop->who.special_id));
 141                                 continue; /* don't add it !!! */
 142                         }
 143                 }
 144         }
 145         SMB_ASSERT(i == naces);
 146
 147         /* store acl */
 148         if(acl(fsp->fsp_name, ACE_SETACL, naces, acebuf)) {
 149                 if(errno == ENOSYS) {
 150                         DEBUG(9, ("acl(ACE_SETACL, %s): Operation is not "
 151                                   "supported on the filesystem where the file "
 152                                   "reside", fsp->fsp_name));
 153                 } else {
 154                         DEBUG(9, ("acl(ACE_SETACL, %s): %s ", fsp->fsp_name,
 155                                         strerror(errno)));
 156                 }
 157                 return 0;
 158         }
 159
 160         return True;
 161 }
 162
 163 /* zfs_set_nt_acl()
 164  * set the local file's acls obtaining it in NT form
 165  * using the NFSv4 format conversion
 166  */
 167 static NTSTATUS zfs_set_nt_acl(vfs_handle_struct *handle, files_struct *fsp,
 168                            uint32 security_info_sent,
 169                            struct security_descriptor *psd)
 170 {
 171         return smb_set_nt_acl_nfs4(fsp, security_info_sent, psd,
 172                         zfs_process_smbacl);
 173 }
 174
 175 static NTSTATUS zfsacl_fget_nt_acl(struct vfs_handle_struct *handle,
 176                                  struct files_struct *fsp,
 177                                  uint32 security_info,
 178                                  struct security_descriptor **ppdesc)
 179 {
 180         SMB4ACL_T *pacl;
 181         NTSTATUS status;
 182
 183         status = zfs_get_nt_acl_common(fsp->fsp_name, security_info, &pacl);
 184         if (!NT_STATUS_IS_OK(status)) {
 185                 return status;
 186         }
 187
 188         return smb_fget_nt_acl_nfs4(fsp, security_info, ppdesc, pacl);
 189 }
 190
 191 static NTSTATUS zfsacl_get_nt_acl(struct vfs_handle_struct *handle,
 192                                 const char *name,  uint32 security_info,
 193                                 struct security_descriptor **ppdesc)
 194 {
 195         SMB4ACL_T *pacl;
 196         NTSTATUS status;
 197
 198         status = zfs_get_nt_acl_common(name, security_info, &pacl);
 199         if (!NT_STATUS_IS_OK(status)) {
 200                 return status;
 201         }
 202
 203         return smb_get_nt_acl_nfs4(handle->conn, name, security_info, ppdesc,
 204                                    pacl);
 205 }
 206
 207 static NTSTATUS zfsacl_fset_nt_acl(vfs_handle_struct *handle,
 208                          files_struct *fsp,
 209                          uint32 security_info_sent,
 210                          SEC_DESC *psd)
 211 {
 212         return zfs_set_nt_acl(handle, fsp, security_info_sent, psd);
 213 }
 214
 215 static NTSTATUS zfsacl_set_nt_acl(vfs_handle_struct *handle,
 216                        files_struct *fsp,
 217                        const char *name, uint32 security_info_sent,
 218                        SEC_DESC *psd)
 219 {
 220         return zfs_set_nt_acl(handle, fsp, security_info_sent, psd);
 221 }
 222
 223 /* nils.goroll@hamburg.de 2008-06-16 :
 224
 225    See also
 226    - https://bugzilla.samba.org/show_bug.cgi?id=5446
 227    - http://bugs.opensolaris.org/view_bug.do?bug_id=6688240
 228
 229    Solaris supports NFSv4 and ZFS ACLs through a common system call, acl(2)
 230    with ACE_SETACL / ACE_GETACL / ACE_GETACLCNT, which is being wrapped for
 231    use by samba in this module.
 232
 233    As the acl(2) interface is identical for ZFS and for NFS, this module,
 234    vfs_zfsacl, can not only be used for ZFS, but also for sharing NFSv4
 235    mounts on Solaris.
 236
 237    But while "traditional" POSIX DRAFT ACLs (using acl(2) with SETACL
 238    / GETACL / GETACLCNT) fail for ZFS, the Solaris NFS client
 239    implemets a compatibility wrapper, which will make calls to
 240    traditional ACL calls though vfs_solarisacl succeed. As the
 241    compatibility wrapper's implementation is (by design) incomplete,
 242    we want to make sure that it is never being called.
 243
 244    As long as Samba does not support an exiplicit method for a module
 245    to define conflicting vfs methods, we should override all conflicting
 246    methods here.
 247
 248    For this to work, we need to make sure that this module is initialised
 249    *after* vfs_solarisacl
 250
 251    Function declarations taken from vfs_solarisacl
 252 */
 253
 254 SMB_ACL_T zfsacl_fail__sys_acl_get_file(vfs_handle_struct *handle,
 255                                         const char *path_p,
 256                                         SMB_ACL_TYPE_T type)
 257 {
 258         return (SMB_ACL_T)NULL;
 259 }
 260 SMB_ACL_T zfsacl_fail__sys_acl_get_fd(vfs_handle_struct *handle,
 261                                       files_struct *fsp,
 262                                       int fd)
 263 {
 264         return (SMB_ACL_T)NULL;
 265 }
 266
 267 int zfsacl_fail__sys_acl_set_file(vfs_handle_struct *handle,
 268                                   const char *name,
 269                                   SMB_ACL_TYPE_T type,
 270                                   SMB_ACL_T theacl)
 271 {
 272         return -1;
 273 }
 274
 275 int zfsacl_fail__sys_acl_set_fd(vfs_handle_struct *handle,
 276                                 files_struct *fsp,
 277                                 int fd, SMB_ACL_T theacl)
 278 {
 279         return -1;
 280 }
 281
 282 int zfsacl_fail__sys_acl_delete_def_file(vfs_handle_struct *handle,
 283                                          const char *path)
 284 {
 285         return -1;
 286 }
 287
 288 /* VFS operations structure */
 289
 290 static vfs_op_tuple zfsacl_ops[] = {
 291         /* invalidate conflicting VFS methods */
 292         {SMB_VFS_OP(zfsacl_fail__sys_acl_get_file),
 293          SMB_VFS_OP_SYS_ACL_GET_FILE,
 294          SMB_VFS_LAYER_OPAQUE},
 295         {SMB_VFS_OP(zfsacl_fail__sys_acl_get_fd),
 296          SMB_VFS_OP_SYS_ACL_GET_FD,
 297          SMB_VFS_LAYER_OPAQUE},
 298         {SMB_VFS_OP(zfsacl_fail__sys_acl_set_file),
 299          SMB_VFS_OP_SYS_ACL_SET_FILE,
 300          SMB_VFS_LAYER_OPAQUE},
 301         {SMB_VFS_OP(zfsacl_fail__sys_acl_set_fd),
 302          SMB_VFS_OP_SYS_ACL_SET_FD,
 303          SMB_VFS_LAYER_OPAQUE},
 304         {SMB_VFS_OP(zfsacl_fail__sys_acl_delete_def_file),
 305          SMB_VFS_OP_SYS_ACL_DELETE_DEF_FILE,
 306          SMB_VFS_LAYER_OPAQUE},
 307
 308         /* actual methods */
 309         {SMB_VFS_OP(zfsacl_fget_nt_acl), SMB_VFS_OP_FGET_NT_ACL,
 310          SMB_VFS_LAYER_OPAQUE},
 311         {SMB_VFS_OP(zfsacl_get_nt_acl), SMB_VFS_OP_GET_NT_ACL,
 312          SMB_VFS_LAYER_OPAQUE},
 313         {SMB_VFS_OP(zfsacl_fset_nt_acl), SMB_VFS_OP_FSET_NT_ACL,
 314          SMB_VFS_LAYER_OPAQUE},
 315         {SMB_VFS_OP(zfsacl_set_nt_acl), SMB_VFS_OP_SET_NT_ACL,
 316          SMB_VFS_LAYER_OPAQUE},
 317         {SMB_VFS_OP(NULL), SMB_VFS_OP_NOOP, SMB_VFS_LAYER_NOOP}
 318 };
 319
 320 NTSTATUS vfs_zfsacl_init(void);
 321 NTSTATUS vfs_zfsacl_init(void)
 322 {
 323         return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "zfsacl",
 324                                 zfsacl_ops);
 325 }