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 "system/filesys.h"
  27 #include "smbd/smbd.h"
  28 #include "nfs4_acls.h"
  29
  30 #if HAVE_FREEBSD_SUNACL_H
  31 #include "sunacl.h"
  32 #endif
  33
  34 #undef DBGC_CLASS
  35 #define DBGC_CLASS DBGC_VFS
  36
  37 #define ZFSACL_MODULE_NAME "zfsacl"
  38
  39 /* zfs_get_nt_acl()
  40  * read the local file's acls and return it in NT form
  41  * using the NFSv4 format conversion
  42  */
  43 static NTSTATUS zfs_get_nt_acl_common(struct connection_struct *conn,
  44                                       TALLOC_CTX *mem_ctx,
  45                                       const struct smb_filename *smb_fname,
  46                                       struct SMB4ACL_T **ppacl)
  47 {
  48         int naces, i;
  49         ace_t *acebuf;
  50         struct SMB4ACL_T *pacl;
  51         SMB_STRUCT_STAT sbuf;
  52         const SMB_STRUCT_STAT *psbuf = NULL;
  53         int ret;
  54
  55         if (VALID_STAT(smb_fname->st)) {
  56                 psbuf = &smb_fname->st;
  57         }
  58
  59         if (psbuf == NULL) {
  60                 ret = vfs_stat_smb_basename(conn, smb_fname, &sbuf);
  61                 if (ret != 0) {
  62                         DBG_INFO("stat [%s]failed: %s\n",
  63                                  smb_fname_str_dbg(smb_fname), strerror(errno));
  64                         return map_nt_error_from_unix(errno);
  65                 }
  66                 psbuf = &sbuf;
  67         }
  68
  69         if (S_ISDIR(psbuf->st_ex_mode) && (ace->aceMask & SMB_ACE4_ADD_FILE)) {
  70                 ace->aceMask |= SMB_ACE4_DELETE_CHILD;
  71         }
  72
  73         /* read the number of file aces */
  74         if((naces = acl(smb_fname->base_name, ACE_GETACLCNT, 0, NULL)) == -1) {
  75                 if(errno == ENOSYS) {
  76                         DEBUG(9, ("acl(ACE_GETACLCNT, %s): Operation is not "
  77                                   "supported on the filesystem where the file "
  78                                   "reside\n", smb_fname->base_name));
  79                 } else {
  80                         DEBUG(9, ("acl(ACE_GETACLCNT, %s): %s ", smb_fname->base_name,
  81                                         strerror(errno)));
  82                 }
  83                 return map_nt_error_from_unix(errno);
  84         }
  85         /* allocate the field of ZFS aces */
  86         mem_ctx = talloc_tos();
  87         acebuf = (ace_t *) talloc_size(mem_ctx, sizeof(ace_t)*naces);
  88         if(acebuf == NULL) {
  89                 return NT_STATUS_NO_MEMORY;
  90         }
  91         /* read the aces into the field */
  92         if(acl(smb_fname->base_name, ACE_GETACL, naces, acebuf) < 0) {
  93                 DEBUG(9, ("acl(ACE_GETACL, %s): %s ", smb_fname->base_name,
  94                                 strerror(errno)));
  95                 return map_nt_error_from_unix(errno);
  96         }
  97         /* create SMB4ACL data */
  98         if((pacl = smb_create_smb4acl(mem_ctx)) == NULL) {
  99                 return NT_STATUS_NO_MEMORY;
 100         }
 101         for(i=0; i<naces; i++) {
 102                 SMB_ACE4PROP_T aceprop;
 103
 104                 aceprop.aceType  = (uint32_t) acebuf[i].a_type;
 105                 aceprop.aceFlags = (uint32_t) acebuf[i].a_flags;
 106                 aceprop.aceMask  = (uint32_t) acebuf[i].a_access_mask;
 107                 aceprop.who.id   = (uint32_t) acebuf[i].a_who;
 108
 109                 if(aceprop.aceFlags & ACE_OWNER) {
 110                         aceprop.flags = SMB_ACE4_ID_SPECIAL;
 111                         aceprop.who.special_id = SMB_ACE4_WHO_OWNER;
 112                 } else if(aceprop.aceFlags & ACE_GROUP) {
 113                         aceprop.flags = SMB_ACE4_ID_SPECIAL;
 114                         aceprop.who.special_id = SMB_ACE4_WHO_GROUP;
 115                 } else if(aceprop.aceFlags & ACE_EVERYONE) {
 116                         aceprop.flags = SMB_ACE4_ID_SPECIAL;
 117                         aceprop.who.special_id = SMB_ACE4_WHO_EVERYONE;
 118                 } else {
 119                         aceprop.flags   = 0;
 120                 }
 121                 if(smb_add_ace4(pacl, &aceprop) == NULL)
 122                         return NT_STATUS_NO_MEMORY;
 123         }
 124
 125         *ppacl = pacl;
 126         return NT_STATUS_OK;
 127 }
 128
 129 /* call-back function processing the NT acl -> ZFS acl using NFSv4 conv. */
 130 static bool zfs_process_smbacl(vfs_handle_struct *handle, files_struct *fsp,
 131                                struct SMB4ACL_T *smbacl)
 132 {
 133         int naces = smb_get_naces(smbacl), i;
 134         ace_t *acebuf;
 135         struct SMB4ACE_T *smbace;
 136         TALLOC_CTX      *mem_ctx;
 137         bool have_special_id = false;
 138
 139         /* allocate the field of ZFS aces */
 140         mem_ctx = talloc_tos();
 141         acebuf = (ace_t *) talloc_size(mem_ctx, sizeof(ace_t)*naces);
 142         if(acebuf == NULL) {
 143                 errno = ENOMEM;
 144                 return False;
 145         }
 146         /* handle all aces */
 147         for(smbace = smb_first_ace4(smbacl), i = 0;
 148                         smbace!=NULL;
 149                         smbace = smb_next_ace4(smbace), i++) {
 150                 SMB_ACE4PROP_T *aceprop = smb_get_ace4(smbace);
 151
 152                 acebuf[i].a_type        = aceprop->aceType;
 153                 acebuf[i].a_flags       = aceprop->aceFlags;
 154                 acebuf[i].a_access_mask = aceprop->aceMask;
 155                 /* SYNC on acls is a no-op on ZFS.
 156                    See bug #7909. */
 157                 acebuf[i].a_access_mask &= ~SMB_ACE4_SYNCHRONIZE;
 158                 acebuf[i].a_who         = aceprop->who.id;
 159                 if(aceprop->flags & SMB_ACE4_ID_SPECIAL) {
 160                         switch(aceprop->who.special_id) {
 161                         case SMB_ACE4_WHO_EVERYONE:
 162                                 acebuf[i].a_flags |= ACE_EVERYONE;
 163                                 break;
 164                         case SMB_ACE4_WHO_OWNER:
 165                                 acebuf[i].a_flags |= ACE_OWNER;
 166                                 break;
 167                         case SMB_ACE4_WHO_GROUP:
 168                                 acebuf[i].a_flags |= ACE_GROUP|ACE_IDENTIFIER_GROUP;
 169                                 break;
 170                         default:
 171                                 DEBUG(8, ("unsupported special_id %d\n", \
 172                                         aceprop->who.special_id));
 173                                 continue; /* don't add it !!! */
 174                         }
 175                         have_special_id = true;
 176                 }
 177         }
 178
 179         if (!have_special_id
 180             && lp_parm_bool(fsp->conn->params->service, "zfsacl",
 181                             "denymissingspecial", false)) {
 182                 errno = EACCES;
 183                 return false;
 184         }
 185
 186         SMB_ASSERT(i == naces);
 187
 188         /* store acl */
 189         if(acl(fsp->fsp_name->base_name, ACE_SETACL, naces, acebuf)) {
 190                 if(errno == ENOSYS) {
 191                         DEBUG(9, ("acl(ACE_SETACL, %s): Operation is not "
 192                                   "supported on the filesystem where the file "
 193                                   "reside", fsp_str_dbg(fsp)));
 194                 } else {
 195                         DEBUG(9, ("acl(ACE_SETACL, %s): %s ", fsp_str_dbg(fsp),
 196                                   strerror(errno)));
 197                 }
 198                 return 0;
 199         }
 200
 201         return True;
 202 }
 203
 204 /* zfs_set_nt_acl()
 205  * set the local file's acls obtaining it in NT form
 206  * using the NFSv4 format conversion
 207  */
 208 static NTSTATUS zfs_set_nt_acl(vfs_handle_struct *handle, files_struct *fsp,
 209                            uint32_t security_info_sent,
 210                            const struct security_descriptor *psd)
 211 {
 212         return smb_set_nt_acl_nfs4(handle, fsp, NULL, security_info_sent, psd,
 213                                    zfs_process_smbacl);
 214 }
 215
 216 static NTSTATUS zfsacl_fget_nt_acl(struct vfs_handle_struct *handle,
 217                                    struct files_struct *fsp,
 218                                    uint32_t security_info,
 219                                    TALLOC_CTX *mem_ctx,
 220                                    struct security_descriptor **ppdesc)
 221 {
 222         struct SMB4ACL_T *pacl;
 223         NTSTATUS status;
 224         TALLOC_CTX *frame = talloc_stackframe();
 225
 226         status = zfs_get_nt_acl_common(handle->conn, frame,
 227                                        fsp->fsp_name, &pacl);
 228         if (!NT_STATUS_IS_OK(status)) {
 229                 TALLOC_FREE(frame);
 230                 return status;
 231         }
 232
 233         status = smb_fget_nt_acl_nfs4(fsp, NULL, security_info, mem_ctx,
 234                                       ppdesc, pacl);
 235         TALLOC_FREE(frame);
 236         return status;
 237 }
 238
 239 static NTSTATUS zfsacl_get_nt_acl(struct vfs_handle_struct *handle,
 240                                 const struct smb_filename *smb_fname,
 241                                 uint32_t security_info,
 242                                 TALLOC_CTX *mem_ctx,
 243                                 struct security_descriptor **ppdesc)
 244 {
 245         struct SMB4ACL_T *pacl;
 246         NTSTATUS status;
 247         TALLOC_CTX *frame = talloc_stackframe();
 248
 249         status = zfs_get_nt_acl_common(handle->conn, frame, smb_fname, &pacl);
 250         if (!NT_STATUS_IS_OK(status)) {
 251                 TALLOC_FREE(frame);
 252                 return status;
 253         }
 254
 255         status = smb_get_nt_acl_nfs4(handle->conn,
 256                                         smb_fname,
 257                                         NULL,
 258                                         security_info,
 259                                         mem_ctx,
 260                                         ppdesc,
 261                                         pacl);
 262         TALLOC_FREE(frame);
 263         return status;
 264 }
 265
 266 static NTSTATUS zfsacl_fset_nt_acl(vfs_handle_struct *handle,
 267                          files_struct *fsp,
 268                          uint32_t security_info_sent,
 269                          const struct security_descriptor *psd)
 270 {
 271         return zfs_set_nt_acl(handle, fsp, security_info_sent, psd);
 272 }
 273
 274 /* nils.goroll@hamburg.de 2008-06-16 :
 275
 276    See also
 277    - https://bugzilla.samba.org/show_bug.cgi?id=5446
 278    - http://bugs.opensolaris.org/view_bug.do?bug_id=6688240
 279
 280    Solaris supports NFSv4 and ZFS ACLs through a common system call, acl(2)
 281    with ACE_SETACL / ACE_GETACL / ACE_GETACLCNT, which is being wrapped for
 282    use by samba in this module.
 283
 284    As the acl(2) interface is identical for ZFS and for NFS, this module,
 285    vfs_zfsacl, can not only be used for ZFS, but also for sharing NFSv4
 286    mounts on Solaris.
 287
 288    But while "traditional" POSIX DRAFT ACLs (using acl(2) with SETACL
 289    / GETACL / GETACLCNT) fail for ZFS, the Solaris NFS client
 290    implemets a compatibility wrapper, which will make calls to
 291    traditional ACL calls though vfs_solarisacl succeed. As the
 292    compatibility wrapper's implementation is (by design) incomplete,
 293    we want to make sure that it is never being called.
 294
 295    As long as Samba does not support an exiplicit method for a module
 296    to define conflicting vfs methods, we should override all conflicting
 297    methods here.
 298
 299    For this to work, we need to make sure that this module is initialised
 300    *after* vfs_solarisacl
 301
 302    Function declarations taken from vfs_solarisacl
 303 */
 304
 305 static SMB_ACL_T zfsacl_fail__sys_acl_get_file(vfs_handle_struct *handle,
 306                                                const char *path_p,
 307                                                SMB_ACL_TYPE_T type,
 308                                                TALLOC_CTX *mem_ctx)
 309 {
 310         return (SMB_ACL_T)NULL;
 311 }
 312
 313 static SMB_ACL_T zfsacl_fail__sys_acl_get_fd(vfs_handle_struct *handle,
 314                                              files_struct *fsp,
 315                                              TALLOC_CTX *mem_ctx)
 316 {
 317         return (SMB_ACL_T)NULL;
 318 }
 319
 320 static int zfsacl_fail__sys_acl_set_file(vfs_handle_struct *handle,
 321                                          const char *name,
 322                                          SMB_ACL_TYPE_T type,
 323                                          SMB_ACL_T theacl)
 324 {
 325         return -1;
 326 }
 327
 328 static int zfsacl_fail__sys_acl_set_fd(vfs_handle_struct *handle,
 329                                        files_struct *fsp,
 330                                        SMB_ACL_T theacl)
 331 {
 332         return -1;
 333 }
 334
 335 static int zfsacl_fail__sys_acl_delete_def_file(vfs_handle_struct *handle,
 336                                                 const char *path)
 337 {
 338         return -1;
 339 }
 340
 341 static int zfsacl_fail__sys_acl_blob_get_file(vfs_handle_struct *handle, const char *path_p, TALLOC_CTX *mem_ctx, char **blob_description, DATA_BLOB *blob)
 342 {
 343         return -1;
 344 }
 345
 346 static int zfsacl_fail__sys_acl_blob_get_fd(vfs_handle_struct *handle, files_struct *fsp, TALLOC_CTX *mem_ctx, char **blob_description, DATA_BLOB *blob)
 347 {
 348         return -1;
 349 }
 350
 351 /* VFS operations structure */
 352
 353 static struct vfs_fn_pointers zfsacl_fns = {
 354         .sys_acl_get_file_fn = zfsacl_fail__sys_acl_get_file,
 355         .sys_acl_get_fd_fn = zfsacl_fail__sys_acl_get_fd,
 356         .sys_acl_blob_get_file_fn = zfsacl_fail__sys_acl_blob_get_file,
 357         .sys_acl_blob_get_fd_fn = zfsacl_fail__sys_acl_blob_get_fd,
 358         .sys_acl_set_file_fn = zfsacl_fail__sys_acl_set_file,
 359         .sys_acl_set_fd_fn = zfsacl_fail__sys_acl_set_fd,
 360         .sys_acl_delete_def_file_fn = zfsacl_fail__sys_acl_delete_def_file,
 361         .fget_nt_acl_fn = zfsacl_fget_nt_acl,
 362         .get_nt_acl_fn = zfsacl_get_nt_acl,
 363         .fset_nt_acl_fn = zfsacl_fset_nt_acl,
 364 };
 365
 366 NTSTATUS vfs_zfsacl_init(void);
 367 NTSTATUS vfs_zfsacl_init(void)
 368 {
 369         return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "zfsacl",
 370                                 &zfsacl_fns);
 371 }