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);
  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 {
  40         struct smb_acl_t *result;
  41         acl_type_t acl_type;
  42         acl_t acl;
  43
  44         switch(type) {
  45         case SMB_ACL_TYPE_ACCESS:
  46                 acl_type = ACL_TYPE_ACCESS;
  47                 break;
  48         case SMB_ACL_TYPE_DEFAULT:
  49                 acl_type = ACL_TYPE_DEFAULT;
  50                 break;
  51         default:
  52                 errno = EINVAL;
  53                 return NULL;
  54         }
  55
  56         acl = acl_get_file(path_p, acl_type);
  57
  58         if (acl == NULL) {
  59                 return NULL;
  60         }
  61
  62         result = smb_acl_to_internal(acl);
  63         acl_free(acl);
  64         return result;
  65 }
  66
  67 SMB_ACL_T posixacl_sys_acl_get_fd(vfs_handle_struct *handle,
  68                                   files_struct *fsp)
  69 {
  70         struct smb_acl_t *result;
  71         acl_t acl = acl_get_fd(fsp->fh->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                             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(fsp->fh->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->info.user.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->info.group.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 #ifdef HAVE_ACL_GET_PERM_NP
 204         ace->a_perm |= (acl_get_perm_np(permset, ACL_READ) ? SMB_ACL_READ : 0);
 205         ace->a_perm |= (acl_get_perm_np(permset, ACL_WRITE) ? SMB_ACL_WRITE : 0);
 206         ace->a_perm |= (acl_get_perm_np(permset, ACL_EXECUTE) ? SMB_ACL_EXECUTE : 0);
 207 #else
 208         ace->a_perm |= (acl_get_perm(permset, ACL_READ) ? SMB_ACL_READ : 0);
 209         ace->a_perm |= (acl_get_perm(permset, ACL_WRITE) ? SMB_ACL_WRITE : 0);
 210         ace->a_perm |= (acl_get_perm(permset, ACL_EXECUTE) ? SMB_ACL_EXECUTE : 0);
 211 #endif
 212         return True;
 213 }
 214
 215 static struct smb_acl_t *smb_acl_to_internal(acl_t acl)
 216 {
 217         struct smb_acl_t *result = sys_acl_init();
 218         int entry_id = ACL_FIRST_ENTRY;
 219         acl_entry_t e;
 220         if (result == NULL) {
 221                 return NULL;
 222         }
 223         while (acl_get_entry(acl, entry_id, &e) == 1) {
 224
 225                 entry_id = ACL_NEXT_ENTRY;
 226
 227                 result->acl = talloc_realloc(result, result->acl,
 228                                              struct smb_acl_entry, result->count+1);
 229                 if (result->acl == NULL) {
 230                         TALLOC_FREE(result);
 231                         DEBUG(0, ("talloc_realloc failed\n"));
 232                         errno = ENOMEM;
 233                         return NULL;
 234                 }
 235
 236                 if (!smb_ace_to_internal(e, &result->acl[result->count])) {
 237                         TALLOC_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->info.user.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->info.group.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                 char *acl_string = sys_acl_to_text(acl, NULL);
 350                 DEBUG(0, ("smb_acl_to_posix: ACL %s is invalid for set (%s)\n",
 351                           acl_string, strerror(errno)));
 352                 SAFE_FREE(acl_string);
 353                 goto fail;
 354         }
 355
 356         return result;
 357
 358  fail:
 359         if (result != NULL) {
 360                 acl_free(result);
 361         }
 362         return NULL;
 363 }
 364
 365 /* VFS operations structure */
 366
 367 static struct vfs_fn_pointers posixacl_fns = {
 368         .sys_acl_get_file_fn = posixacl_sys_acl_get_file,
 369         .sys_acl_get_fd_fn = posixacl_sys_acl_get_fd,
 370         .sys_acl_set_file_fn = posixacl_sys_acl_set_file,
 371         .sys_acl_set_fd_fn = posixacl_sys_acl_set_fd,
 372         .sys_acl_delete_def_file_fn = posixacl_sys_acl_delete_def_file,
 373 };
 374
 375 NTSTATUS vfs_posixacl_init(void);
 376 NTSTATUS vfs_posixacl_init(void)
 377 {
 378         return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "posixacl",
 379                                 &posixacl_fns);
 380 }