source3/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         bool have_special_id = false;
 110
 111         /* allocate the field of ZFS aces */
 112         mem_ctx = talloc_tos();
 113         acebuf = (ace_t *) talloc_size(mem_ctx, sizeof(ace_t)*naces);
 114         if(acebuf == NULL) {
 115                 errno = ENOMEM;
 116                 return False;
 117         }
 118         /* handle all aces */
 119         for(smbace = smb_first_ace4(smbacl), i = 0;
 120                         smbace!=NULL;
 121                         smbace = smb_next_ace4(smbace), i++) {
 122                 SMB_ACE4PROP_T *aceprop = smb_get_ace4(smbace);
 123
 124                 acebuf[i].a_type        = aceprop->aceType;
 125                 acebuf[i].a_flags       = aceprop->aceFlags;
 126                 acebuf[i].a_access_mask = aceprop->aceMask;
 127                 acebuf[i].a_who         = aceprop->who.id;
 128                 if(aceprop->flags & SMB_ACE4_ID_SPECIAL) {
 129                         switch(aceprop->who.special_id) {
 130                         case SMB_ACE4_WHO_EVERYONE:
 131                                 acebuf[i].a_flags |= ACE_EVERYONE;
 132                                 break;
 133                         case SMB_ACE4_WHO_OWNER:
 134                                 acebuf[i].a_flags |= ACE_OWNER;
 135                                 break;
 136                         case SMB_ACE4_WHO_GROUP:
 137                                 acebuf[i].a_flags |= ACE_GROUP;
 138                                 break;
 139                         default:
 140                                 DEBUG(8, ("unsupported special_id %d\n", \
 141                                         aceprop->who.special_id));
 142                                 continue; /* don't add it !!! */
 143                         }
 144                         have_special_id = true;
 145                 }
 146         }
 147
 148         if (!have_special_id
 149             && lp_parm_bool(fsp->conn->params->service, "zfsacl",
 150                             "denymissingspecial", false)) {
 151                 errno = EACCES;
 152                 return false;
 153         }
 154
 155         SMB_ASSERT(i == naces);
 156
 157         /* store acl */
 158         if(acl(fsp->fsp_name->base_name, ACE_SETACL, naces, acebuf)) {
 159                 if(errno == ENOSYS) {
 160                         DEBUG(9, ("acl(ACE_SETACL, %s): Operation is not "
 161                                   "supported on the filesystem where the file "
 162                                   "reside", fsp_str_dbg(fsp)));
 163                 } else {
 164                         DEBUG(9, ("acl(ACE_SETACL, %s): %s ", fsp_str_dbg(fsp),
 165                                   strerror(errno)));
 166                 }
 167                 return 0;
 168         }
 169
 170         return True;
 171 }
 172
 173 /* zfs_set_nt_acl()
 174  * set the local file's acls obtaining it in NT form
 175  * using the NFSv4 format conversion
 176  */
 177 static NTSTATUS zfs_set_nt_acl(vfs_handle_struct *handle, files_struct *fsp,
 178                            uint32 security_info_sent,
 179                            const struct security_descriptor *psd)
 180 {
 181         return smb_set_nt_acl_nfs4(fsp, security_info_sent, psd,
 182                         zfs_process_smbacl);
 183 }
 184
 185 static NTSTATUS zfsacl_fget_nt_acl(struct vfs_handle_struct *handle,
 186                                  struct files_struct *fsp,
 187                                  uint32 security_info,
 188                                  struct security_descriptor **ppdesc)
 189 {
 190         SMB4ACL_T *pacl;
 191         NTSTATUS status;
 192
 193         status = zfs_get_nt_acl_common(fsp->fsp_name->base_name, security_info,
 194                                        &pacl);
 195         if (!NT_STATUS_IS_OK(status)) {
 196                 return status;
 197         }
 198
 199         return smb_fget_nt_acl_nfs4(fsp, security_info, ppdesc, pacl);
 200 }
 201
 202 static NTSTATUS zfsacl_get_nt_acl(struct vfs_handle_struct *handle,
 203                                 const char *name,  uint32 security_info,
 204                                 struct security_descriptor **ppdesc)
 205 {
 206         SMB4ACL_T *pacl;
 207         NTSTATUS status;
 208
 209         status = zfs_get_nt_acl_common(name, security_info, &pacl);
 210         if (!NT_STATUS_IS_OK(status)) {
 211                 return status;
 212         }
 213
 214         return smb_get_nt_acl_nfs4(handle->conn, name, security_info, ppdesc,
 215                                    pacl);
 216 }
 217
 218 static NTSTATUS zfsacl_fset_nt_acl(vfs_handle_struct *handle,
 219                          files_struct *fsp,
 220                          uint32 security_info_sent,
 221                          const SEC_DESC *psd)
 222 {
 223         return zfs_set_nt_acl(handle, fsp, security_info_sent, psd);
 224 }
 225
 226 /* nils.goroll@hamburg.de 2008-06-16 :
 227
 228    See also
 229    - https://bugzilla.samba.org/show_bug.cgi?id=5446
 230    - http://bugs.opensolaris.org/view_bug.do?bug_id=6688240
 231
 232    Solaris supports NFSv4 and ZFS ACLs through a common system call, acl(2)
 233    with ACE_SETACL / ACE_GETACL / ACE_GETACLCNT, which is being wrapped for
 234    use by samba in this module.
 235
 236    As the acl(2) interface is identical for ZFS and for NFS, this module,
 237    vfs_zfsacl, can not only be used for ZFS, but also for sharing NFSv4
 238    mounts on Solaris.
 239
 240    But while "traditional" POSIX DRAFT ACLs (using acl(2) with SETACL
 241    / GETACL / GETACLCNT) fail for ZFS, the Solaris NFS client
 242    implemets a compatibility wrapper, which will make calls to
 243    traditional ACL calls though vfs_solarisacl succeed. As the
 244    compatibility wrapper's implementation is (by design) incomplete,
 245    we want to make sure that it is never being called.
 246
 247    As long as Samba does not support an exiplicit method for a module
 248    to define conflicting vfs methods, we should override all conflicting
 249    methods here.
 250
 251    For this to work, we need to make sure that this module is initialised
 252    *after* vfs_solarisacl
 253
 254    Function declarations taken from vfs_solarisacl
 255 */
 256
 257 SMB_ACL_T zfsacl_fail__sys_acl_get_file(vfs_handle_struct *handle,
 258                                         const char *path_p,
 259                                         SMB_ACL_TYPE_T type)
 260 {
 261         return (SMB_ACL_T)NULL;
 262 }
 263 SMB_ACL_T zfsacl_fail__sys_acl_get_fd(vfs_handle_struct *handle,
 264                                       files_struct *fsp,
 265                                       int fd)
 266 {
 267         return (SMB_ACL_T)NULL;
 268 }
 269
 270 int zfsacl_fail__sys_acl_set_file(vfs_handle_struct *handle,
 271                                   const char *name,
 272                                   SMB_ACL_TYPE_T type,
 273                                   SMB_ACL_T theacl)
 274 {
 275         return -1;
 276 }
 277
 278 int zfsacl_fail__sys_acl_set_fd(vfs_handle_struct *handle,
 279                                 files_struct *fsp,
 280                                 int fd, SMB_ACL_T theacl)
 281 {
 282         return -1;
 283 }
 284
 285 int zfsacl_fail__sys_acl_delete_def_file(vfs_handle_struct *handle,
 286                                          const char *path)
 287 {
 288         return -1;
 289 }
 290
 291 /* VFS operations structure */
 292
 293 static struct vfs_fn_pointers zfsacl_fns = {
 294         .sys_acl_get_file = zfsacl_fail__sys_acl_get_file,
 295         .sys_acl_get_fd = zfsacl_fail__sys_acl_get_fd,
 296         .sys_acl_set_file = zfsacl_fail__sys_acl_set_file,
 297         .sys_acl_set_fd = zfsacl_fail__sys_acl_set_fd,
 298         .sys_acl_delete_def_file = zfsacl_fail__sys_acl_delete_def_file,
 299         .fget_nt_acl = zfsacl_fget_nt_acl,
 300         .get_nt_acl = zfsacl_get_nt_acl,
 301         .fset_nt_acl = zfsacl_fset_nt_acl,
 302 };
 303
 304 NTSTATUS vfs_zfsacl_init(void);
 305 NTSTATUS vfs_zfsacl_init(void)
 306 {
 307         return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "zfsacl",
 308                                 &zfsacl_fns);
 309 }