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 /* VFS operations structure */
 224
 225 static vfs_op_tuple zfsacl_ops[] = {
 226         {SMB_VFS_OP(zfsacl_fget_nt_acl), SMB_VFS_OP_FGET_NT_ACL,
 227          SMB_VFS_LAYER_OPAQUE},
 228         {SMB_VFS_OP(zfsacl_get_nt_acl), SMB_VFS_OP_GET_NT_ACL,
 229          SMB_VFS_LAYER_OPAQUE},
 230         {SMB_VFS_OP(zfsacl_fset_nt_acl), SMB_VFS_OP_FSET_NT_ACL,
 231          SMB_VFS_LAYER_OPAQUE},
 232         {SMB_VFS_OP(zfsacl_set_nt_acl), SMB_VFS_OP_SET_NT_ACL,
 233          SMB_VFS_LAYER_OPAQUE},
 234         {SMB_VFS_OP(NULL), SMB_VFS_OP_NOOP, SMB_VFS_LAYER_NOOP}
 235 };
 236
 237 /* != 0 if this module will be compiled as static */
 238
 239 #define STATIC 0
 240
 241 #if STATIC
 242 NTSTATUS vfs_zfsacl_init(void);
 243 #else
 244 NTSTATUS init_module(void);
 245 #endif
 246
 247 NTSTATUS
 248 #if STATIC
 249         vfs_zfsacl_init
 250 #else
 251         init_module
 252 #endif
 253                 (void)
 254 {
 255         return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "zfsacl",
 256                                 zfsacl_ops);
 257 }