source3/modules/vfs_posixacl.c

   1 /*
   2    Unix SMB/Netbios implementation.
   3    VFS module to get and set posix acls
   4    Copyright (C) Volker Lendecke 2006
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #include "includes.h"
  21 #include "system/filesys.h"
  22 #include "smbd/smbd.h"
  23 #include "modules/vfs_posixacl.h"
  24
  25 /* prototypes for static functions first - for clarity */
  26
  27 static bool smb_ace_to_internal(acl_entry_t posix_ace,
  28                                 struct smb_acl_entry *ace);
  29 static struct smb_acl_t *smb_acl_to_internal(acl_t acl, TALLOC_CTX *mem_ctx);
  30 static int smb_acl_set_mode(acl_entry_t entry, SMB_ACL_PERM_T perm);
  31 static acl_t smb_acl_to_posix(const struct smb_acl_t *acl);
  32
  33
  34 /* public functions - the api */
  35
  36 SMB_ACL_T posixacl_sys_acl_get_file(vfs_handle_struct *handle,
  37                                     const char *path_p,
  38                                     SMB_ACL_TYPE_T type,
  39                                     TALLOC_CTX *mem_ctx)
  40 {
  41         struct smb_acl_t *result;
  42         acl_type_t acl_type;
  43         acl_t acl;
  44
  45         switch(type) {
  46         case SMB_ACL_TYPE_ACCESS:
  47                 acl_type = ACL_TYPE_ACCESS;
  48                 break;
  49         case SMB_ACL_TYPE_DEFAULT:
  50                 acl_type = ACL_TYPE_DEFAULT;
  51                 break;
  52         default:
  53                 errno = EINVAL;
  54                 return NULL;
  55         }
  56
  57         acl = acl_get_file(path_p, acl_type);
  58
  59         if (acl == NULL) {
  60                 return NULL;
  61         }
  62
  63         result = smb_acl_to_internal(acl, mem_ctx);
  64         acl_free(acl);
  65         return result;
  66 }
  67
  68 SMB_ACL_T posixacl_sys_acl_get_fd(vfs_handle_struct *handle,
  69                                   files_struct *fsp, TALLOC_CTX *mem_ctx)
  70 {
  71         struct smb_acl_t *result;
  72         acl_t acl = acl_get_fd(fsp->fh->fd);
  73
  74         if (acl == NULL) {
  75                 return NULL;
  76         }
  77
  78         result = smb_acl_to_internal(acl, mem_ctx);
  79         acl_free(acl);
  80         return result;
  81 }
  82
  83 int posixacl_sys_acl_set_file(vfs_handle_struct *handle,
  84                               const char *name,
  85                               SMB_ACL_TYPE_T type,
  86                               SMB_ACL_T theacl)
  87 {
  88         int res;
  89         acl_type_t acl_type;
  90         acl_t acl;
  91
  92         DEBUG(10, ("Calling acl_set_file: %s, %d\n", name, type));
  93
  94         switch(type) {
  95         case SMB_ACL_TYPE_ACCESS:
  96                 acl_type = ACL_TYPE_ACCESS;
  97                 break;
  98         case SMB_ACL_TYPE_DEFAULT:
  99                 acl_type = ACL_TYPE_DEFAULT;
 100                 break;
 101         default:
 102                 errno = EINVAL;
 103                 return -1;
 104         }
 105
 106         if ((acl = smb_acl_to_posix(theacl)) == NULL) {
 107                 return -1;
 108         }
 109         res = acl_set_file(name, acl_type, acl);
 110         if (res != 0) {
 111                 DEBUG(10, ("acl_set_file failed: %s\n", strerror(errno)));
 112         }
 113         acl_free(acl);
 114         return res;
 115 }
 116
 117 int posixacl_sys_acl_set_fd(vfs_handle_struct *handle,
 118                             files_struct *fsp,
 119                             SMB_ACL_T theacl)
 120 {
 121         int res;
 122         acl_t acl = smb_acl_to_posix(theacl);
 123         if (acl == NULL) {
 124                 return -1;
 125         }
 126         res =  acl_set_fd(fsp->fh->fd, acl);
 127         acl_free(acl);
 128         return res;
 129 }
 130
 131 int posixacl_sys_acl_delete_def_file(vfs_handle_struct *handle,
 132                                      const char *path)
 133 {
 134         return acl_delete_def_file(path);
 135 }
 136
 137
 138 /* private functions */
 139
 140 static bool smb_ace_to_internal(acl_entry_t posix_ace,
 141                                 struct smb_acl_entry *ace)
 142 {
 143         acl_tag_t tag;
 144         acl_permset_t permset;
 145
 146         if (acl_get_tag_type(posix_ace, &tag) != 0) {
 147                 DEBUG(0, ("smb_acl_get_tag_type failed\n"));
 148                 return False;
 149         }
 150
 151         switch(tag) {
 152         case ACL_USER:
 153                 ace->a_type = SMB_ACL_USER;
 154                 break;
 155         case ACL_USER_OBJ:
 156                 ace->a_type = SMB_ACL_USER_OBJ;
 157                 break;
 158         case ACL_GROUP:
 159                 ace->a_type = SMB_ACL_GROUP;
 160                 break;
 161         case ACL_GROUP_OBJ:
 162                 ace->a_type = SMB_ACL_GROUP_OBJ;
 163                 break;
 164         case ACL_OTHER:
 165                 ace->a_type = SMB_ACL_OTHER;
 166                 break;
 167         case ACL_MASK:
 168                 ace->a_type = SMB_ACL_MASK;
 169                 break;
 170 #ifdef HAVE_ACL_EVERYONE
 171         case ACL_EVERYONE:
 172                 DEBUG(1, ("ACL tag type ACL_EVERYONE. FreeBSD with ZFS? Use 'vfs objects = zfsacl'\n"));
 173                 return false;
 174 #endif
 175         default:
 176                 DEBUG(0, ("unknown tag type %d\n", (unsigned int)tag));
 177                 return False;
 178         }
 179         switch(ace->a_type) {
 180         case SMB_ACL_USER: {
 181                 uid_t *puid = (uid_t *)acl_get_qualifier(posix_ace);
 182                 if (puid == NULL) {
 183                         DEBUG(0, ("smb_acl_get_qualifier failed\n"));
 184                         return False;
 185                 }
 186                 ace->info.user.uid = *puid;
 187                 acl_free(puid);
 188                 break;
 189         }
 190
 191         case SMB_ACL_GROUP: {
 192                 gid_t *pgid = (uid_t *)acl_get_qualifier(posix_ace);
 193                 if (pgid == NULL) {
 194                         DEBUG(0, ("smb_acl_get_qualifier failed\n"));
 195                         return False;
 196                 }
 197                 ace->info.group.gid = *pgid;
 198                 acl_free(pgid);
 199                 break;
 200         }
 201         default:
 202                 break;
 203         }
 204         if (acl_get_permset(posix_ace, &permset) != 0) {
 205                 DEBUG(0, ("smb_acl_get_mode failed\n"));
 206                 return False;
 207         }
 208         ace->a_perm = 0;
 209 #ifdef HAVE_ACL_GET_PERM_NP
 210         ace->a_perm |= (acl_get_perm_np(permset, ACL_READ) ? SMB_ACL_READ : 0);
 211         ace->a_perm |= (acl_get_perm_np(permset, ACL_WRITE) ? SMB_ACL_WRITE : 0);
 212         ace->a_perm |= (acl_get_perm_np(permset, ACL_EXECUTE) ? SMB_ACL_EXECUTE : 0);
 213 #else
 214         ace->a_perm |= (acl_get_perm(permset, ACL_READ) ? SMB_ACL_READ : 0);
 215         ace->a_perm |= (acl_get_perm(permset, ACL_WRITE) ? SMB_ACL_WRITE : 0);
 216         ace->a_perm |= (acl_get_perm(permset, ACL_EXECUTE) ? SMB_ACL_EXECUTE : 0);
 217 #endif
 218         return True;
 219 }
 220
 221 static struct smb_acl_t *smb_acl_to_internal(acl_t acl, TALLOC_CTX *mem_ctx)
 222 {
 223         struct smb_acl_t *result = sys_acl_init(mem_ctx);
 224         int entry_id = ACL_FIRST_ENTRY;
 225         acl_entry_t e;
 226         if (result == NULL) {
 227                 return NULL;
 228         }
 229         while (acl_get_entry(acl, entry_id, &e) == 1) {
 230
 231                 entry_id = ACL_NEXT_ENTRY;
 232
 233                 result->acl = talloc_realloc(result, result->acl,
 234                                              struct smb_acl_entry, result->count+1);
 235                 if (result->acl == NULL) {
 236                         TALLOC_FREE(result);
 237                         DEBUG(0, ("talloc_realloc failed\n"));
 238                         errno = ENOMEM;
 239                         return NULL;
 240                 }
 241
 242                 if (!smb_ace_to_internal(e, &result->acl[result->count])) {
 243                         TALLOC_FREE(result);
 244                         return NULL;
 245                 }
 246
 247                 result->count += 1;
 248         }
 249         return result;
 250 }
 251
 252 static int smb_acl_set_mode(acl_entry_t entry, SMB_ACL_PERM_T perm)
 253 {
 254         int ret;
 255         acl_permset_t permset;
 256
 257         if ((ret = acl_get_permset(entry, &permset)) != 0) {
 258                 return ret;
 259         }
 260         if ((ret = acl_clear_perms(permset)) != 0) {
 261                 return ret;
 262         }
 263         if ((perm & SMB_ACL_READ) &&
 264             ((ret = acl_add_perm(permset, ACL_READ)) != 0)) {
 265                 return ret;
 266         }
 267         if ((perm & SMB_ACL_WRITE) &&
 268             ((ret = acl_add_perm(permset, ACL_WRITE)) != 0)) {
 269                 return ret;
 270         }
 271         if ((perm & SMB_ACL_EXECUTE) &&
 272             ((ret = acl_add_perm(permset, ACL_EXECUTE)) != 0)) {
 273                 return ret;
 274         }
 275         return acl_set_permset(entry, permset);
 276 }
 277
 278 static acl_t smb_acl_to_posix(const struct smb_acl_t *acl)
 279 {
 280         acl_t result;
 281         int i;
 282
 283         result = acl_init(acl->count);
 284         if (result == NULL) {
 285                 DEBUG(10, ("acl_init failed\n"));
 286                 return NULL;
 287         }
 288
 289         for (i=0; i<acl->count; i++) {
 290                 const struct smb_acl_entry *entry = &acl->acl[i];
 291                 acl_entry_t e;
 292                 acl_tag_t tag;
 293
 294                 if (acl_create_entry(&result, &e) != 0) {
 295                         DEBUG(1, ("acl_create_entry failed: %s\n",
 296                                   strerror(errno)));
 297                         goto fail;
 298                 }
 299
 300                 switch (entry->a_type) {
 301                 case SMB_ACL_USER:
 302                         tag = ACL_USER;
 303                         break;
 304                 case SMB_ACL_USER_OBJ:
 305                         tag = ACL_USER_OBJ;
 306                         break;
 307                 case SMB_ACL_GROUP:
 308                         tag = ACL_GROUP;
 309                         break;
 310                 case SMB_ACL_GROUP_OBJ:
 311                         tag = ACL_GROUP_OBJ;
 312                         break;
 313                 case SMB_ACL_OTHER:
 314                         tag = ACL_OTHER;
 315                         break;
 316                 case SMB_ACL_MASK:
 317                         tag = ACL_MASK;
 318                         break;
 319                 default:
 320                         DEBUG(1, ("Unknown tag value %d\n", entry->a_type));
 321                         goto fail;
 322                 }
 323
 324                 if (acl_set_tag_type(e, tag) != 0) {
 325                         DEBUG(10, ("acl_set_tag_type(%d) failed: %s\n",
 326                                    tag, strerror(errno)));
 327                         goto fail;
 328                 }
 329
 330                 switch (entry->a_type) {
 331                 case SMB_ACL_USER:
 332                         if (acl_set_qualifier(e, &entry->info.user.uid) != 0) {
 333                                 DEBUG(1, ("acl_set_qualifiier failed: %s\n",
 334                                           strerror(errno)));
 335                                 goto fail;
 336                         }
 337                         break;
 338                 case SMB_ACL_GROUP:
 339                         if (acl_set_qualifier(e, &entry->info.group.gid) != 0) {
 340                                 DEBUG(1, ("acl_set_qualifiier failed: %s\n",
 341                                           strerror(errno)));
 342                                 goto fail;
 343                         }
 344                         break;
 345                 default:        /* Shut up, compiler! :-) */
 346                         break;
 347                 }
 348
 349                 if (smb_acl_set_mode(e, entry->a_perm) != 0) {
 350                         goto fail;
 351                 }
 352         }
 353
 354         if (acl_valid(result) != 0) {
 355                 char *acl_string = sys_acl_to_text(acl, NULL);
 356                 DEBUG(0, ("smb_acl_to_posix: ACL %s is invalid for set (%s)\n",
 357                           acl_string, strerror(errno)));
 358                 SAFE_FREE(acl_string);
 359                 goto fail;
 360         }
 361
 362         return result;
 363
 364  fail:
 365         if (result != NULL) {
 366                 acl_free(result);
 367         }
 368         return NULL;
 369 }
 370
 371 /* VFS operations structure */
 372
 373 static struct vfs_fn_pointers posixacl_fns = {
 374         .sys_acl_get_file_fn = posixacl_sys_acl_get_file,
 375         .sys_acl_get_fd_fn = posixacl_sys_acl_get_fd,
 376         .sys_acl_blob_get_file_fn = posix_sys_acl_blob_get_file,
 377         .sys_acl_blob_get_fd_fn = posix_sys_acl_blob_get_fd,
 378         .sys_acl_set_file_fn = posixacl_sys_acl_set_file,
 379         .sys_acl_set_fd_fn = posixacl_sys_acl_set_fd,
 380         .sys_acl_delete_def_file_fn = posixacl_sys_acl_delete_def_file,
 381 };
 382
 383 NTSTATUS vfs_posixacl_init(void);
 384 NTSTATUS vfs_posixacl_init(void)
 385 {
 386         return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "posixacl",
 387                                 &posixacl_fns);
 388 }