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(const char *name,
  44                                       uint32 security_info,
  45                                       SMB4ACL_T **ppacl)
  46 {
  47         int naces, i;
  48         ace_t *acebuf;
  49         SMB4ACL_T *pacl;
  50         TALLOC_CTX      *mem_ctx;
  51
  52         /* read the number of file aces */
  53         if((naces = acl(name, ACE_GETACLCNT, 0, NULL)) == -1) {
  54                 if(errno == ENOSYS) {
  55                         DEBUG(9, ("acl(ACE_GETACLCNT, %s): Operation is not "
  56                                   "supported on the filesystem where the file "
  57                                   "reside\n", name));
  58                 } else {
  59                         DEBUG(9, ("acl(ACE_GETACLCNT, %s): %s ", name,
  60                                         strerror(errno)));
  61                 }
  62                 return map_nt_error_from_unix(errno);
  63         }
  64         /* allocate the field of ZFS aces */
  65         mem_ctx = talloc_tos();
  66         acebuf = (ace_t *) talloc_size(mem_ctx, sizeof(ace_t)*naces);
  67         if(acebuf == NULL) {
  68                 return NT_STATUS_NO_MEMORY;
  69         }
  70         /* read the aces into the field */
  71         if(acl(name, ACE_GETACL, naces, acebuf) < 0) {
  72                 DEBUG(9, ("acl(ACE_GETACL, %s): %s ", name,
  73                                 strerror(errno)));
  74                 return map_nt_error_from_unix(errno);
  75         }
  76         /* create SMB4ACL data */
  77         if((pacl = smb_create_smb4acl()) == NULL) {
  78                 return NT_STATUS_NO_MEMORY;
  79         }
  80         for(i=0; i<naces; i++) {
  81                 SMB_ACE4PROP_T aceprop;
  82
  83                 aceprop.aceType  = (uint32) acebuf[i].a_type;
  84                 aceprop.aceFlags = (uint32) acebuf[i].a_flags;
  85                 aceprop.aceMask  = (uint32) acebuf[i].a_access_mask;
  86                 aceprop.who.id   = (uint32) acebuf[i].a_who;
  87
  88                 if(aceprop.aceFlags & ACE_OWNER) {
  89                         aceprop.flags = SMB_ACE4_ID_SPECIAL;
  90                         aceprop.who.special_id = SMB_ACE4_WHO_OWNER;
  91                 } else if(aceprop.aceFlags & ACE_GROUP) {
  92                         aceprop.flags = SMB_ACE4_ID_SPECIAL;
  93                         aceprop.who.special_id = SMB_ACE4_WHO_GROUP;
  94                 } else if(aceprop.aceFlags & ACE_EVERYONE) {
  95                         aceprop.flags = SMB_ACE4_ID_SPECIAL;
  96                         aceprop.who.special_id = SMB_ACE4_WHO_EVERYONE;
  97                 } else {
  98                         aceprop.flags   = 0;
  99                 }
 100                 if(smb_add_ace4(pacl, &aceprop) == NULL)
 101                         return NT_STATUS_NO_MEMORY;
 102         }
 103
 104         *ppacl = pacl;
 105         return NT_STATUS_OK;
 106 }
 107
 108 /* call-back function processing the NT acl -> ZFS acl using NFSv4 conv. */
 109 static bool zfs_process_smbacl(files_struct *fsp, 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;
 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 security_info_sent,
 188                            const struct security_descriptor *psd)
 189 {
 190         return smb_set_nt_acl_nfs4(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 security_info,
 197                                    TALLOC_CTX *mem_ctx,
 198                                    struct security_descriptor **ppdesc)
 199 {
 200         SMB4ACL_T *pacl;
 201         NTSTATUS status;
 202
 203         status = zfs_get_nt_acl_common(fsp->fsp_name->base_name,
 204                                        security_info,
 205                                        &pacl);
 206         if (!NT_STATUS_IS_OK(status)) {
 207                 return status;
 208         }
 209
 210         return smb_fget_nt_acl_nfs4(fsp, security_info, mem_ctx, ppdesc, pacl);
 211 }
 212
 213 static NTSTATUS zfsacl_get_nt_acl(struct vfs_handle_struct *handle,
 214                                   const char *name, uint32 security_info,
 215                                   TALLOC_CTX *mem_ctx,
 216                                   struct security_descriptor **ppdesc)
 217 {
 218         SMB4ACL_T *pacl;
 219         NTSTATUS status;
 220
 221         status = zfs_get_nt_acl_common(name, security_info, &pacl);
 222         if (!NT_STATUS_IS_OK(status)) {
 223                 return status;
 224         }
 225
 226         return smb_get_nt_acl_nfs4(handle->conn, name, security_info,
 227                                    mem_ctx, ppdesc,
 228                                    pacl);
 229 }
 230
 231 static NTSTATUS zfsacl_fset_nt_acl(vfs_handle_struct *handle,
 232                          files_struct *fsp,
 233                          uint32 security_info_sent,
 234                          const struct security_descriptor *psd)
 235 {
 236         return zfs_set_nt_acl(handle, fsp, security_info_sent, psd);
 237 }
 238
 239 /* nils.goroll@hamburg.de 2008-06-16 :
 240
 241    See also
 242    - https://bugzilla.samba.org/show_bug.cgi?id=5446
 243    - http://bugs.opensolaris.org/view_bug.do?bug_id=6688240
 244
 245    Solaris supports NFSv4 and ZFS ACLs through a common system call, acl(2)
 246    with ACE_SETACL / ACE_GETACL / ACE_GETACLCNT, which is being wrapped for
 247    use by samba in this module.
 248
 249    As the acl(2) interface is identical for ZFS and for NFS, this module,
 250    vfs_zfsacl, can not only be used for ZFS, but also for sharing NFSv4
 251    mounts on Solaris.
 252
 253    But while "traditional" POSIX DRAFT ACLs (using acl(2) with SETACL
 254    / GETACL / GETACLCNT) fail for ZFS, the Solaris NFS client
 255    implemets a compatibility wrapper, which will make calls to
 256    traditional ACL calls though vfs_solarisacl succeed. As the
 257    compatibility wrapper's implementation is (by design) incomplete,
 258    we want to make sure that it is never being called.
 259
 260    As long as Samba does not support an exiplicit method for a module
 261    to define conflicting vfs methods, we should override all conflicting
 262    methods here.
 263
 264    For this to work, we need to make sure that this module is initialised
 265    *after* vfs_solarisacl
 266
 267    Function declarations taken from vfs_solarisacl
 268 */
 269
 270 static SMB_ACL_T zfsacl_fail__sys_acl_get_file(vfs_handle_struct *handle,
 271                                                const char *path_p,
 272                                                SMB_ACL_TYPE_T type)
 273 {
 274         return (SMB_ACL_T)NULL;
 275 }
 276
 277 static SMB_ACL_T zfsacl_fail__sys_acl_get_fd(vfs_handle_struct *handle,
 278                                              files_struct *fsp)
 279 {
 280         return (SMB_ACL_T)NULL;
 281 }
 282
 283 static int zfsacl_fail__sys_acl_set_file(vfs_handle_struct *handle,
 284                                          const char *name,
 285                                          SMB_ACL_TYPE_T type,
 286                                          SMB_ACL_T theacl)
 287 {
 288         return -1;
 289 }
 290
 291 static int zfsacl_fail__sys_acl_set_fd(vfs_handle_struct *handle,
 292                                        files_struct *fsp,
 293                                        SMB_ACL_T theacl)
 294 {
 295         return -1;
 296 }
 297
 298 static int zfsacl_fail__sys_acl_delete_def_file(vfs_handle_struct *handle,
 299                                                 const char *path)
 300 {
 301         return -1;
 302 }
 303
 304 /* VFS operations structure */
 305
 306 static struct vfs_fn_pointers zfsacl_fns = {
 307         .sys_acl_get_file_fn = zfsacl_fail__sys_acl_get_file,
 308         .sys_acl_get_fd_fn = zfsacl_fail__sys_acl_get_fd,
 309         .sys_acl_set_file_fn = zfsacl_fail__sys_acl_set_file,
 310         .sys_acl_set_fd_fn = zfsacl_fail__sys_acl_set_fd,
 311         .sys_acl_delete_def_file_fn = zfsacl_fail__sys_acl_delete_def_file,
 312         .fget_nt_acl_fn = zfsacl_fget_nt_acl,
 313         .get_nt_acl_fn = zfsacl_get_nt_acl,
 314         .fset_nt_acl_fn = zfsacl_fset_nt_acl,
 315 };
 316
 317 NTSTATUS vfs_zfsacl_init(void);
 318 NTSTATUS vfs_zfsacl_init(void)
 319 {
 320         return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "zfsacl",
 321                                 &zfsacl_fns);
 322 }