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