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
  22
  23 /* prototypes for static functions first - for clarity */
  24
  25 static bool smb_ace_to_internal(acl_entry_t posix_ace,
  26                                 struct smb_acl_entry *ace);
  27 static struct smb_acl_t *smb_acl_to_internal(acl_t acl);
  28 static int smb_acl_set_mode(acl_entry_t entry, SMB_ACL_PERM_T perm);
  29 static acl_t smb_acl_to_posix(const struct smb_acl_t *acl);
  30
  31
  32 /* public functions - the api */
  33
  34 SMB_ACL_T posixacl_sys_acl_get_file(vfs_handle_struct *handle,
  35                                     const char *path_p,
  36                                     SMB_ACL_TYPE_T type)
  37 {
  38         struct smb_acl_t *result;
  39         acl_type_t acl_type;
  40         acl_t acl;
  41
  42         switch(type) {
  43         case SMB_ACL_TYPE_ACCESS:
  44                 acl_type = ACL_TYPE_ACCESS;
  45                 break;
  46         case SMB_ACL_TYPE_DEFAULT:
  47                 acl_type = ACL_TYPE_DEFAULT;
  48                 break;
  49         default:
  50                 errno = EINVAL;
  51                 return NULL;
  52         }
  53
  54         acl = acl_get_file(path_p, acl_type);
  55
  56         if (acl == NULL) {
  57                 return NULL;
  58         }
  59
  60         result = smb_acl_to_internal(acl);
  61         acl_free(acl);
  62         return result;
  63 }
  64
  65 SMB_ACL_T posixacl_sys_acl_get_fd(vfs_handle_struct *handle,
  66                                   files_struct *fsp,
  67                                   int fd)
  68 {
  69         struct smb_acl_t *result;
  70         acl_t acl = acl_get_fd(fd);
  71
  72         if (acl == NULL) {
  73                 return NULL;
  74         }
  75
  76         result = smb_acl_to_internal(acl);
  77         acl_free(acl);
  78         return result;
  79 }
  80
  81 int posixacl_sys_acl_set_file(vfs_handle_struct *handle,
  82                               const char *name,
  83                               SMB_ACL_TYPE_T type,
  84                               SMB_ACL_T theacl)
  85 {
  86         int res;
  87         acl_type_t acl_type;
  88         acl_t acl;
  89
  90         DEBUG(10, ("Calling acl_set_file: %s, %d\n", name, type));
  91
  92         switch(type) {
  93         case SMB_ACL_TYPE_ACCESS:
  94                 acl_type = ACL_TYPE_ACCESS;
  95                 break;
  96         case SMB_ACL_TYPE_DEFAULT:
  97                 acl_type = ACL_TYPE_DEFAULT;
  98                 break;
  99         default:
 100                 errno = EINVAL;
 101                 return -1;
 102         }
 103
 104         if ((acl = smb_acl_to_posix(theacl)) == NULL) {
 105                 return -1;
 106         }
 107         res = acl_set_file(name, acl_type, acl);
 108         if (res != 0) {
 109                 DEBUG(10, ("acl_set_file failed: %s\n", strerror(errno)));
 110         }
 111         acl_free(acl);
 112         return res;
 113 }
 114
 115 int posixacl_sys_acl_set_fd(vfs_handle_struct *handle,
 116                             files_struct *fsp,
 117                             int fd, SMB_ACL_T theacl)
 118 {
 119         int res;
 120         acl_t acl = smb_acl_to_posix(theacl);
 121         if (acl == NULL) {
 122                 return -1;
 123         }
 124         res =  acl_set_fd(fd, acl);
 125         acl_free(acl);
 126         return res;
 127 }
 128
 129 int posixacl_sys_acl_delete_def_file(vfs_handle_struct *handle,
 130                                      const char *path)
 131 {
 132         return acl_delete_def_file(path);
 133 }
 134
 135
 136 /* private functions */
 137
 138 static bool smb_ace_to_internal(acl_entry_t posix_ace,
 139                                 struct smb_acl_entry *ace)
 140 {
 141         acl_tag_t tag;
 142         acl_permset_t permset;
 143
 144         if (acl_get_tag_type(posix_ace, &tag) != 0) {
 145                 DEBUG(0, ("smb_acl_get_tag_type failed\n"));
 146                 return False;
 147         }
 148
 149         switch(tag) {
 150         case ACL_USER:
 151                 ace->a_type = SMB_ACL_USER;
 152                 break;
 153         case ACL_USER_OBJ:
 154                 ace->a_type = SMB_ACL_USER_OBJ;
 155                 break;
 156         case ACL_GROUP:
 157                 ace->a_type = SMB_ACL_GROUP;
 158                 break;
 159         case ACL_GROUP_OBJ:
 160                 ace->a_type = SMB_ACL_GROUP_OBJ;
 161                 break;
 162         case ACL_OTHER:
 163                 ace->a_type = SMB_ACL_OTHER;
 164                 break;
 165         case ACL_MASK:
 166                 ace->a_type = SMB_ACL_MASK;
 167                 break;
 168         default:
 169                 DEBUG(0, ("unknown tag type %d\n", (unsigned int)tag));
 170                 return False;
 171         }
 172         switch(ace->a_type) {
 173         case SMB_ACL_USER: {
 174                 uid_t *puid = (uid_t *)acl_get_qualifier(posix_ace);
 175                 if (puid == NULL) {
 176                         DEBUG(0, ("smb_acl_get_qualifier failed\n"));
 177                         return False;
 178                 }
 179                 ace->uid = *puid;
 180                 acl_free(puid);
 181                 break;
 182         }
 183
 184         case SMB_ACL_GROUP: {
 185                 gid_t *pgid = (uid_t *)acl_get_qualifier(posix_ace);
 186                 if (pgid == NULL) {
 187                         DEBUG(0, ("smb_acl_get_qualifier failed\n"));
 188                         return False;
 189                 }
 190                 ace->gid = *pgid;
 191                 acl_free(pgid);
 192                 break;
 193         }
 194         default:
 195                 break;
 196         }
 197         if (acl_get_permset(posix_ace, &permset) != 0) {
 198                 DEBUG(0, ("smb_acl_get_mode failed\n"));
 199                 return False;
 200         }
 201         ace->a_perm = 0;
 202 #ifdef HAVE_ACL_GET_PERM_NP
 203         ace->a_perm |= (acl_get_perm_np(permset, ACL_READ) ? SMB_ACL_READ : 0);
 204         ace->a_perm |= (acl_get_perm_np(permset, ACL_WRITE) ? SMB_ACL_WRITE : 0);
 205         ace->a_perm |= (acl_get_perm_np(permset, ACL_EXECUTE) ? SMB_ACL_EXECUTE : 0);
 206 #else
 207         ace->a_perm |= (acl_get_perm(permset, ACL_READ) ? SMB_ACL_READ : 0);
 208         ace->a_perm |= (acl_get_perm(permset, ACL_WRITE) ? SMB_ACL_WRITE : 0);
 209         ace->a_perm |= (acl_get_perm(permset, ACL_EXECUTE) ? SMB_ACL_EXECUTE : 0);
 210 #endif
 211         return True;
 212 }
 213
 214 static struct smb_acl_t *smb_acl_to_internal(acl_t acl)
 215 {
 216         struct smb_acl_t *result = SMB_MALLOC_P(struct smb_acl_t);
 217         int entry_id = ACL_FIRST_ENTRY;
 218         acl_entry_t e;
 219         if (result == NULL) {
 220                 return NULL;
 221         }
 222         ZERO_STRUCTP(result);
 223         while (acl_get_entry(acl, entry_id, &e) == 1) {
 224
 225                 entry_id = ACL_NEXT_ENTRY;
 226
 227                 result = (struct smb_acl_t *)SMB_REALLOC(
 228                         result, sizeof(struct smb_acl_t) +
 229                         (sizeof(struct smb_acl_entry) * (result->count+1)));
 230                 if (result == NULL) {
 231                         DEBUG(0, ("SMB_REALLOC failed\n"));
 232                         errno = ENOMEM;
 233                         return NULL;
 234                 }
 235
 236                 if (!smb_ace_to_internal(e, &result->acl[result->count])) {
 237                         SAFE_FREE(result);
 238                         return NULL;
 239                 }
 240
 241                 result->count += 1;
 242         }
 243         return result;
 244 }
 245
 246 static int smb_acl_set_mode(acl_entry_t entry, SMB_ACL_PERM_T perm)
 247 {
 248         int ret;
 249         acl_permset_t permset;
 250
 251         if ((ret = acl_get_permset(entry, &permset)) != 0) {
 252                 return ret;
 253         }
 254         if ((ret = acl_clear_perms(permset)) != 0) {
 255                 return ret;
 256         }
 257         if ((perm & SMB_ACL_READ) &&
 258             ((ret = acl_add_perm(permset, ACL_READ)) != 0)) {
 259                 return ret;
 260         }
 261         if ((perm & SMB_ACL_WRITE) &&
 262             ((ret = acl_add_perm(permset, ACL_WRITE)) != 0)) {
 263                 return ret;
 264         }
 265         if ((perm & SMB_ACL_EXECUTE) &&
 266             ((ret = acl_add_perm(permset, ACL_EXECUTE)) != 0)) {
 267                 return ret;
 268         }
 269         return acl_set_permset(entry, permset);
 270 }
 271
 272 static acl_t smb_acl_to_posix(const struct smb_acl_t *acl)
 273 {
 274         acl_t result;
 275         int i;
 276
 277         result = acl_init(acl->count);
 278         if (result == NULL) {
 279                 DEBUG(10, ("acl_init failed\n"));
 280                 return NULL;
 281         }
 282
 283         for (i=0; i<acl->count; i++) {
 284                 const struct smb_acl_entry *entry = &acl->acl[i];
 285                 acl_entry_t e;
 286                 acl_tag_t tag;
 287
 288                 if (acl_create_entry(&result, &e) != 0) {
 289                         DEBUG(1, ("acl_create_entry failed: %s\n",
 290                                   strerror(errno)));
 291                         goto fail;
 292                 }
 293
 294                 switch (entry->a_type) {
 295                 case SMB_ACL_USER:
 296                         tag = ACL_USER;
 297                         break;
 298                 case SMB_ACL_USER_OBJ:
 299                         tag = ACL_USER_OBJ;
 300                         break;
 301                 case SMB_ACL_GROUP:
 302                         tag = ACL_GROUP;
 303                         break;
 304                 case SMB_ACL_GROUP_OBJ:
 305                         tag = ACL_GROUP_OBJ;
 306                         break;
 307                 case SMB_ACL_OTHER:
 308                         tag = ACL_OTHER;
 309                         break;
 310                 case SMB_ACL_MASK:
 311                         tag = ACL_MASK;
 312                         break;
 313                 default:
 314                         DEBUG(1, ("Unknown tag value %d\n", entry->a_type));
 315                         goto fail;
 316                 }
 317
 318                 if (acl_set_tag_type(e, tag) != 0) {
 319                         DEBUG(10, ("acl_set_tag_type(%d) failed: %s\n",
 320                                    tag, strerror(errno)));
 321                         goto fail;
 322                 }
 323
 324                 switch (entry->a_type) {
 325                 case SMB_ACL_USER:
 326                         if (acl_set_qualifier(e, &entry->uid) != 0) {
 327                                 DEBUG(1, ("acl_set_qualifiier failed: %s\n",
 328                                           strerror(errno)));
 329                                 goto fail;
 330                         }
 331                         break;
 332                 case SMB_ACL_GROUP:
 333                         if (acl_set_qualifier(e, &entry->gid) != 0) {
 334                                 DEBUG(1, ("acl_set_qualifiier failed: %s\n",
 335                                           strerror(errno)));
 336                                 goto fail;
 337                         }
 338                         break;
 339                 default:        /* Shut up, compiler! :-) */
 340                         break;
 341                 }
 342
 343                 if (smb_acl_set_mode(e, entry->a_perm) != 0) {
 344                         goto fail;
 345                 }
 346         }
 347
 348         if (acl_valid(result) != 0) {
 349                 DEBUG(0, ("smb_acl_to_posix: ACL is invalid for set (%s)\n",
 350                           strerror(errno)));
 351                 goto fail;
 352         }
 353
 354         return result;
 355
 356  fail:
 357         if (result != NULL) {
 358                 acl_free(result);
 359         }
 360         return NULL;
 361 }
 362
 363 /* VFS operations structure */
 364
 365 static vfs_op_tuple posixacl_op_tuples[] = {
 366         /* Disk operations */
 367   {SMB_VFS_OP(posixacl_sys_acl_get_file),
 368    SMB_VFS_OP_SYS_ACL_GET_FILE,
 369    SMB_VFS_LAYER_TRANSPARENT},
 370
 371   {SMB_VFS_OP(posixacl_sys_acl_get_fd),
 372    SMB_VFS_OP_SYS_ACL_GET_FD,
 373    SMB_VFS_LAYER_TRANSPARENT},
 374
 375   {SMB_VFS_OP(posixacl_sys_acl_set_file),
 376    SMB_VFS_OP_SYS_ACL_SET_FILE,
 377    SMB_VFS_LAYER_TRANSPARENT},
 378
 379   {SMB_VFS_OP(posixacl_sys_acl_set_fd),
 380    SMB_VFS_OP_SYS_ACL_SET_FD,
 381    SMB_VFS_LAYER_TRANSPARENT},
 382
 383   {SMB_VFS_OP(posixacl_sys_acl_delete_def_file),
 384    SMB_VFS_OP_SYS_ACL_DELETE_DEF_FILE,
 385    SMB_VFS_LAYER_TRANSPARENT},
 386
 387   {SMB_VFS_OP(NULL),
 388    SMB_VFS_OP_NOOP,
 389    SMB_VFS_LAYER_NOOP}
 390 };
 391
 392 NTSTATUS vfs_posixacl_init(void);
 393 NTSTATUS vfs_posixacl_init(void)
 394 {
 395         return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "posixacl",
 396                                 posixacl_op_tuples);
 397 }