source/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 2 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, write to the Free Software
  18    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19 */
  20
  21 #include "includes.h"
  22
  23
  24 /* prototypes for static functions first - for clarity */
  25
  26 static BOOL smb_ace_to_internal(acl_entry_t posix_ace,
  27                                 struct smb_acl_entry *ace);
  28 static struct smb_acl_t *smb_acl_to_internal(acl_t acl);
  29 static int smb_acl_set_mode(acl_entry_t entry, SMB_ACL_PERM_T perm);
  30 static acl_t smb_acl_to_posix(const struct smb_acl_t *acl);
  31
  32
  33 /* public functions - the api */
  34
  35 SMB_ACL_T posixacl_sys_acl_get_file(vfs_handle_struct *handle,
  36                                     const char *path_p,
  37                                     SMB_ACL_TYPE_T type)
  38 {
  39         struct smb_acl_t *result;
  40         acl_type_t acl_type;
  41         acl_t acl;
  42
  43         switch(type) {
  44         case SMB_ACL_TYPE_ACCESS:
  45                 acl_type = ACL_TYPE_ACCESS;
  46                 break;
  47         case SMB_ACL_TYPE_DEFAULT:
  48                 acl_type = ACL_TYPE_DEFAULT;
  49                 break;
  50         default:
  51                 errno = EINVAL;
  52                 return NULL;
  53         }
  54
  55         acl = acl_get_file(path_p, acl_type);
  56
  57         if (acl == NULL) {
  58                 return NULL;
  59         }
  60
  61         result = smb_acl_to_internal(acl);
  62         acl_free(acl);
  63         return result;
  64 }
  65
  66 SMB_ACL_T posixacl_sys_acl_get_fd(vfs_handle_struct *handle,
  67                                   files_struct *fsp,
  68                                   int fd)
  69 {
  70         struct smb_acl_t *result;
  71         acl_t acl = acl_get_fd(fd);
  72
  73         if (acl == NULL) {
  74                 return NULL;
  75         }
  76
  77         result = smb_acl_to_internal(acl);
  78         acl_free(acl);
  79         return result;
  80 }
  81
  82 int posixacl_sys_acl_set_file(vfs_handle_struct *handle,
  83                               const char *name,
  84                               SMB_ACL_TYPE_T type,
  85                               SMB_ACL_T theacl)
  86 {
  87         int res;
  88         acl_type_t acl_type;
  89         acl_t acl;
  90
  91         DEBUG(10, ("Calling acl_set_file: %s, %d\n", name, type));
  92
  93         switch(type) {
  94         case SMB_ACL_TYPE_ACCESS:
  95                 acl_type = ACL_TYPE_ACCESS;
  96                 break;
  97         case SMB_ACL_TYPE_DEFAULT:
  98                 acl_type = ACL_TYPE_DEFAULT;
  99                 break;
 100         default:
 101                 errno = EINVAL;
 102                 return -1;
 103         }
 104
 105         if ((acl = smb_acl_to_posix(theacl)) == NULL) {
 106                 return -1;
 107         }
 108         res = acl_set_file(name, acl_type, acl);
 109         if (res != 0) {
 110                 DEBUG(10, ("acl_set_file failed: %s\n", strerror(errno)));
 111         }
 112         acl_free(acl);
 113         return res;
 114 }
 115
 116 int posixacl_sys_acl_set_fd(vfs_handle_struct *handle,
 117                             files_struct *fsp,
 118                             int fd, SMB_ACL_T theacl)
 119 {
 120         int res;
 121         acl_t acl = smb_acl_to_posix(theacl);
 122         if (acl == NULL) {
 123                 return -1;
 124         }
 125         res =  acl_set_fd(fd, acl);
 126         acl_free(acl);
 127         return res;
 128 }
 129
 130 int posixacl_sys_acl_delete_def_file(vfs_handle_struct *handle,
 131                                      const char *path)
 132 {
 133         return acl_delete_def_file(path);
 134 }
 135
 136
 137 /* private functions */
 138
 139 static BOOL smb_ace_to_internal(acl_entry_t posix_ace,
 140                                 struct smb_acl_entry *ace)
 141 {
 142         acl_tag_t tag;
 143         acl_permset_t permset;
 144
 145         if (acl_get_tag_type(posix_ace, &tag) != 0) {
 146                 DEBUG(0, ("smb_acl_get_tag_type failed\n"));
 147                 return False;
 148         }
 149
 150         switch(tag) {
 151         case ACL_USER:
 152                 ace->a_type = SMB_ACL_USER;
 153                 break;
 154         case ACL_USER_OBJ:
 155                 ace->a_type = SMB_ACL_USER_OBJ;
 156                 break;
 157         case ACL_GROUP:
 158                 ace->a_type = SMB_ACL_GROUP;
 159                 break;
 160         case ACL_GROUP_OBJ:
 161                 ace->a_type = SMB_ACL_GROUP_OBJ;
 162                 break;
 163         case ACL_OTHER:
 164                 ace->a_type = SMB_ACL_OTHER;
 165                 break;
 166         case ACL_MASK:
 167                 ace->a_type = SMB_ACL_MASK;
 168                 break;
 169         default:
 170                 DEBUG(0, ("unknown tag type %d\n", (unsigned int)tag));
 171                 return False;
 172         }
 173         switch(ace->a_type) {
 174         case SMB_ACL_USER: {
 175                 uid_t *puid = (uid_t *)acl_get_qualifier(posix_ace);
 176                 if (puid == NULL) {
 177                         DEBUG(0, ("smb_acl_get_qualifier failed\n"));
 178                         return False;
 179                 }
 180                 ace->uid = *puid;
 181                 acl_free(puid);
 182                 break;
 183         }
 184
 185         case SMB_ACL_GROUP: {
 186                 gid_t *pgid = (uid_t *)acl_get_qualifier(posix_ace);
 187                 if (pgid == NULL) {
 188                         DEBUG(0, ("smb_acl_get_qualifier failed\n"));
 189                         return False;
 190                 }
 191                 ace->gid = *pgid;
 192                 acl_free(pgid);
 193                 break;
 194         }
 195         default:
 196                 break;
 197         }
 198         if (acl_get_permset(posix_ace, &permset) != 0) {
 199                 DEBUG(0, ("smb_acl_get_mode failed\n"));
 200                 return False;
 201         }
 202         ace->a_perm = 0;
 203         ace->a_perm |= (acl_get_perm(permset, ACL_READ) ? SMB_ACL_READ : 0);
 204         ace->a_perm |= (acl_get_perm(permset, ACL_WRITE) ? SMB_ACL_WRITE : 0);
 205         ace->a_perm |= (acl_get_perm(permset, ACL_EXECUTE) ? SMB_ACL_EXECUTE : 0);
 206         return True;
 207 }
 208
 209 static struct smb_acl_t *smb_acl_to_internal(acl_t acl)
 210 {
 211         struct smb_acl_t *result = SMB_MALLOC_P(struct smb_acl_t);
 212         int entry_id = ACL_FIRST_ENTRY;
 213         acl_entry_t e;
 214         if (result == NULL) {
 215                 return NULL;
 216         }
 217         ZERO_STRUCTP(result);
 218         while (acl_get_entry(acl, entry_id, &e) == 1) {
 219
 220                 entry_id = ACL_NEXT_ENTRY;
 221
 222                 result = (struct smb_acl_t *)SMB_REALLOC(
 223                         result, sizeof(struct smb_acl_t) +
 224                         (sizeof(struct smb_acl_entry) * (result->count+1)));
 225                 if (result == NULL) {
 226                         DEBUG(0, ("SMB_REALLOC failed\n"));
 227                         errno = ENOMEM;
 228                         return NULL;
 229                 }
 230
 231                 if (!smb_ace_to_internal(e, &result->acl[result->count])) {
 232                         SAFE_FREE(result);
 233                         return NULL;
 234                 }
 235
 236                 result->count += 1;
 237         }
 238         return result;
 239 }
 240
 241 static int smb_acl_set_mode(acl_entry_t entry, SMB_ACL_PERM_T perm)
 242 {
 243         int ret;
 244         acl_permset_t permset;
 245
 246         if ((ret = acl_get_permset(entry, &permset)) != 0) {
 247                 return ret;
 248         }
 249         if ((ret = acl_clear_perms(permset)) != 0) {
 250                 return ret;
 251         }
 252         if ((perm & SMB_ACL_READ) &&
 253             ((ret = acl_add_perm(permset, ACL_READ)) != 0)) {
 254                 return ret;
 255         }
 256         if ((perm & SMB_ACL_WRITE) &&
 257             ((ret = acl_add_perm(permset, ACL_WRITE)) != 0)) {
 258                 return ret;
 259         }
 260         if ((perm & SMB_ACL_EXECUTE) &&
 261             ((ret = acl_add_perm(permset, ACL_EXECUTE)) != 0)) {
 262                 return ret;
 263         }
 264         return acl_set_permset(entry, permset);
 265 }
 266
 267 static acl_t smb_acl_to_posix(const struct smb_acl_t *acl)
 268 {
 269         acl_t result;
 270         int i;
 271
 272         result = acl_init(acl->count);
 273         if (result == NULL) {
 274                 DEBUG(10, ("acl_init failed\n"));
 275                 return NULL;
 276         }
 277
 278         for (i=0; i<acl->count; i++) {
 279                 const struct smb_acl_entry *entry = &acl->acl[i];
 280                 acl_entry_t e;
 281                 acl_tag_t tag;
 282
 283                 if (acl_create_entry(&result, &e) != 0) {
 284                         DEBUG(1, ("acl_create_entry failed: %s\n",
 285                                   strerror(errno)));
 286                         goto fail;
 287                 }
 288
 289                 switch (entry->a_type) {
 290                 case SMB_ACL_USER:
 291                         tag = ACL_USER;
 292                         break;
 293                 case SMB_ACL_USER_OBJ:
 294                         tag = ACL_USER_OBJ;
 295                         break;
 296                 case SMB_ACL_GROUP:
 297                         tag = ACL_GROUP;
 298                         break;
 299                 case SMB_ACL_GROUP_OBJ:
 300                         tag = ACL_GROUP_OBJ;
 301                         break;
 302                 case SMB_ACL_OTHER:
 303                         tag = ACL_OTHER;
 304                         break;
 305                 case SMB_ACL_MASK:
 306                         tag = ACL_MASK;
 307                         break;
 308                 default:
 309                         DEBUG(1, ("Unknown tag value %d\n", entry->a_type));
 310                         goto fail;
 311                 }
 312
 313                 if (acl_set_tag_type(e, tag) != 0) {
 314                         DEBUG(10, ("acl_set_tag_type(%d) failed: %s\n",
 315                                    tag, strerror(errno)));
 316                         goto fail;
 317                 }
 318
 319                 switch (entry->a_type) {
 320                 case SMB_ACL_USER:
 321                         if (acl_set_qualifier(e, &entry->uid) != 0) {
 322                                 DEBUG(1, ("acl_set_qualifiier failed: %s\n",
 323                                           strerror(errno)));
 324                                 goto fail;
 325                         }
 326                         break;
 327                 case SMB_ACL_GROUP:
 328                         if (acl_set_qualifier(e, &entry->gid) != 0) {
 329                                 DEBUG(1, ("acl_set_qualifiier failed: %s\n",
 330                                           strerror(errno)));
 331                                 goto fail;
 332                         }
 333                         break;
 334                 default:        /* Shut up, compiler! :-) */
 335                         break;
 336                 }
 337
 338                 if (smb_acl_set_mode(e, entry->a_perm) != 0) {
 339                         goto fail;
 340                 }
 341         }
 342
 343         if (acl_valid(result) != 0) {
 344                 DEBUG(0, ("smb_acl_to_posix: ACL is invalid for set (%s)\n",
 345                           strerror(errno)));
 346                 goto fail;
 347         }
 348
 349         return result;
 350
 351  fail:
 352         if (result != NULL) {
 353                 acl_free(result);
 354         }
 355         return NULL;
 356 }
 357
 358 /* VFS operations structure */
 359
 360 static vfs_op_tuple posixacl_op_tuples[] = {
 361         /* Disk operations */
 362   {SMB_VFS_OP(posixacl_sys_acl_get_file),
 363    SMB_VFS_OP_SYS_ACL_GET_FILE,
 364    SMB_VFS_LAYER_TRANSPARENT},
 365
 366   {SMB_VFS_OP(posixacl_sys_acl_get_fd),
 367    SMB_VFS_OP_SYS_ACL_GET_FD,
 368    SMB_VFS_LAYER_TRANSPARENT},
 369
 370   {SMB_VFS_OP(posixacl_sys_acl_set_file),
 371    SMB_VFS_OP_SYS_ACL_SET_FILE,
 372    SMB_VFS_LAYER_TRANSPARENT},
 373
 374   {SMB_VFS_OP(posixacl_sys_acl_set_fd),
 375    SMB_VFS_OP_SYS_ACL_SET_FD,
 376    SMB_VFS_LAYER_TRANSPARENT},
 377
 378   {SMB_VFS_OP(posixacl_sys_acl_delete_def_file),
 379    SMB_VFS_OP_SYS_ACL_DELETE_DEF_FILE,
 380    SMB_VFS_LAYER_TRANSPARENT},
 381
 382   {SMB_VFS_OP(NULL),
 383    SMB_VFS_OP_NOOP,
 384    SMB_VFS_LAYER_NOOP}
 385 };
 386
 387 NTSTATUS vfs_posixacl_init(void);
 388 NTSTATUS vfs_posixacl_init(void)
 389 {
 390         return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "posixacl",
 391                                 posixacl_op_tuples);
 392 }