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 struct smb_filename *smb_fname,
  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(smb_fname->base_name, 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 struct smb_filename *smb_fname,
  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",
  93                         smb_fname->base_name,
  94                         type));
  95
  96         switch(type) {
  97         case SMB_ACL_TYPE_ACCESS:
  98                 acl_type = ACL_TYPE_ACCESS;
  99                 break;
 100         case SMB_ACL_TYPE_DEFAULT:
 101                 acl_type = ACL_TYPE_DEFAULT;
 102                 break;
 103         default:
 104                 errno = EINVAL;
 105                 return -1;
 106         }
 107
 108         if ((acl = smb_acl_to_posix(theacl)) == NULL) {
 109                 return -1;
 110         }
 111         res = acl_set_file(smb_fname->base_name, acl_type, acl);
 112         if (res != 0) {
 113                 DEBUG(10, ("acl_set_file failed: %s\n", strerror(errno)));
 114         }
 115         acl_free(acl);
 116         return res;
 117 }
 118
 119 int posixacl_sys_acl_set_fd(vfs_handle_struct *handle,
 120                             files_struct *fsp,
 121                             SMB_ACL_T theacl)
 122 {
 123         int res;
 124         acl_t acl = smb_acl_to_posix(theacl);
 125         if (acl == NULL) {
 126                 return -1;
 127         }
 128         res =  acl_set_fd(fsp->fh->fd, acl);
 129         acl_free(acl);
 130         return res;
 131 }
 132
 133 int posixacl_sys_acl_delete_def_file(vfs_handle_struct *handle,
 134                                 const struct smb_filename *smb_fname)
 135 {
 136         return acl_delete_def_file(smb_fname->base_name);
 137 }
 138
 139
 140 /* private functions */
 141
 142 static bool smb_ace_to_internal(acl_entry_t posix_ace,
 143                                 struct smb_acl_entry *ace)
 144 {
 145         acl_tag_t tag;
 146         acl_permset_t permset;
 147
 148         if (acl_get_tag_type(posix_ace, &tag) != 0) {
 149                 DEBUG(0, ("smb_acl_get_tag_type failed\n"));
 150                 return False;
 151         }
 152
 153         switch(tag) {
 154         case ACL_USER:
 155                 ace->a_type = SMB_ACL_USER;
 156                 break;
 157         case ACL_USER_OBJ:
 158                 ace->a_type = SMB_ACL_USER_OBJ;
 159                 break;
 160         case ACL_GROUP:
 161                 ace->a_type = SMB_ACL_GROUP;
 162                 break;
 163         case ACL_GROUP_OBJ:
 164                 ace->a_type = SMB_ACL_GROUP_OBJ;
 165                 break;
 166         case ACL_OTHER:
 167                 ace->a_type = SMB_ACL_OTHER;
 168                 break;
 169         case ACL_MASK:
 170                 ace->a_type = SMB_ACL_MASK;
 171                 break;
 172 #ifdef HAVE_ACL_EVERYONE
 173         case ACL_EVERYONE:
 174                 DEBUG(1, ("ACL tag type ACL_EVERYONE. FreeBSD with ZFS? Use 'vfs objects = zfsacl'\n"));
 175                 return false;
 176 #endif
 177         default:
 178                 DEBUG(0, ("unknown tag type %d\n", (unsigned int)tag));
 179                 return False;
 180         }
 181         switch(ace->a_type) {
 182         case SMB_ACL_USER: {
 183                 uid_t *puid = (uid_t *)acl_get_qualifier(posix_ace);
 184                 if (puid == NULL) {
 185                         DEBUG(0, ("smb_acl_get_qualifier failed\n"));
 186                         return False;
 187                 }
 188                 ace->info.user.uid = *puid;
 189                 acl_free(puid);
 190                 break;
 191         }
 192
 193         case SMB_ACL_GROUP: {
 194                 gid_t *pgid = (uid_t *)acl_get_qualifier(posix_ace);
 195                 if (pgid == NULL) {
 196                         DEBUG(0, ("smb_acl_get_qualifier failed\n"));
 197                         return False;
 198                 }
 199                 ace->info.group.gid = *pgid;
 200                 acl_free(pgid);
 201                 break;
 202         }
 203         default:
 204                 break;
 205         }
 206         if (acl_get_permset(posix_ace, &permset) != 0) {
 207                 DEBUG(0, ("smb_acl_get_mode failed\n"));
 208                 return False;
 209         }
 210         ace->a_perm = 0;
 211 #ifdef HAVE_ACL_GET_PERM_NP
 212         ace->a_perm |= (acl_get_perm_np(permset, ACL_READ) ? SMB_ACL_READ : 0);
 213         ace->a_perm |= (acl_get_perm_np(permset, ACL_WRITE) ? SMB_ACL_WRITE : 0);
 214         ace->a_perm |= (acl_get_perm_np(permset, ACL_EXECUTE) ? SMB_ACL_EXECUTE : 0);
 215 #else
 216         ace->a_perm |= (acl_get_perm(permset, ACL_READ) ? SMB_ACL_READ : 0);
 217         ace->a_perm |= (acl_get_perm(permset, ACL_WRITE) ? SMB_ACL_WRITE : 0);
 218         ace->a_perm |= (acl_get_perm(permset, ACL_EXECUTE) ? SMB_ACL_EXECUTE : 0);
 219 #endif
 220         return True;
 221 }
 222
 223 static struct smb_acl_t *smb_acl_to_internal(acl_t acl, TALLOC_CTX *mem_ctx)
 224 {
 225         struct smb_acl_t *result = sys_acl_init(mem_ctx);
 226         int entry_id = ACL_FIRST_ENTRY;
 227         acl_entry_t e;
 228         if (result == NULL) {
 229                 return NULL;
 230         }
 231         while (acl_get_entry(acl, entry_id, &e) == 1) {
 232
 233                 entry_id = ACL_NEXT_ENTRY;
 234
 235                 result->acl = talloc_realloc(result, result->acl,
 236                                              struct smb_acl_entry, result->count+1);
 237                 if (result->acl == NULL) {
 238                         TALLOC_FREE(result);
 239                         DEBUG(0, ("talloc_realloc failed\n"));
 240                         errno = ENOMEM;
 241                         return NULL;
 242                 }
 243
 244                 if (!smb_ace_to_internal(e, &result->acl[result->count])) {
 245                         TALLOC_FREE(result);
 246                         return NULL;
 247                 }
 248
 249                 result->count += 1;
 250         }
 251         return result;
 252 }
 253
 254 static int smb_acl_set_mode(acl_entry_t entry, SMB_ACL_PERM_T perm)
 255 {
 256         int ret;
 257         acl_permset_t permset;
 258
 259         if ((ret = acl_get_permset(entry, &permset)) != 0) {
 260                 return ret;
 261         }
 262         if ((ret = acl_clear_perms(permset)) != 0) {
 263                 return ret;
 264         }
 265         if ((perm & SMB_ACL_READ) &&
 266             ((ret = acl_add_perm(permset, ACL_READ)) != 0)) {
 267                 return ret;
 268         }
 269         if ((perm & SMB_ACL_WRITE) &&
 270             ((ret = acl_add_perm(permset, ACL_WRITE)) != 0)) {
 271                 return ret;
 272         }
 273         if ((perm & SMB_ACL_EXECUTE) &&
 274             ((ret = acl_add_perm(permset, ACL_EXECUTE)) != 0)) {
 275                 return ret;
 276         }
 277         return acl_set_permset(entry, permset);
 278 }
 279
 280 static acl_t smb_acl_to_posix(const struct smb_acl_t *acl)
 281 {
 282         acl_t result;
 283         int i;
 284
 285         result = acl_init(acl->count);
 286         if (result == NULL) {
 287                 DEBUG(10, ("acl_init failed\n"));
 288                 return NULL;
 289         }
 290
 291         for (i=0; i<acl->count; i++) {
 292                 const struct smb_acl_entry *entry = &acl->acl[i];
 293                 acl_entry_t e;
 294                 acl_tag_t tag;
 295
 296                 if (acl_create_entry(&result, &e) != 0) {
 297                         DEBUG(1, ("acl_create_entry failed: %s\n",
 298                                   strerror(errno)));
 299                         goto fail;
 300                 }
 301
 302                 switch (entry->a_type) {
 303                 case SMB_ACL_USER:
 304                         tag = ACL_USER;
 305                         break;
 306                 case SMB_ACL_USER_OBJ:
 307                         tag = ACL_USER_OBJ;
 308                         break;
 309                 case SMB_ACL_GROUP:
 310                         tag = ACL_GROUP;
 311                         break;
 312                 case SMB_ACL_GROUP_OBJ:
 313                         tag = ACL_GROUP_OBJ;
 314                         break;
 315                 case SMB_ACL_OTHER:
 316                         tag = ACL_OTHER;
 317                         break;
 318                 case SMB_ACL_MASK:
 319                         tag = ACL_MASK;
 320                         break;
 321                 default:
 322                         DEBUG(1, ("Unknown tag value %d\n", entry->a_type));
 323                         goto fail;
 324                 }
 325
 326                 if (acl_set_tag_type(e, tag) != 0) {
 327                         DEBUG(10, ("acl_set_tag_type(%d) failed: %s\n",
 328                                    tag, strerror(errno)));
 329                         goto fail;
 330                 }
 331
 332                 switch (entry->a_type) {
 333                 case SMB_ACL_USER:
 334                         if (acl_set_qualifier(e, &entry->info.user.uid) != 0) {
 335                                 DEBUG(1, ("acl_set_qualifiier failed: %s\n",
 336                                           strerror(errno)));
 337                                 goto fail;
 338                         }
 339                         break;
 340                 case SMB_ACL_GROUP:
 341                         if (acl_set_qualifier(e, &entry->info.group.gid) != 0) {
 342                                 DEBUG(1, ("acl_set_qualifiier failed: %s\n",
 343                                           strerror(errno)));
 344                                 goto fail;
 345                         }
 346                         break;
 347                 default:        /* Shut up, compiler! :-) */
 348                         break;
 349                 }
 350
 351                 if (smb_acl_set_mode(e, entry->a_perm) != 0) {
 352                         goto fail;
 353                 }
 354         }
 355
 356         if (acl_valid(result) != 0) {
 357                 char *acl_string = sys_acl_to_text(acl, NULL);
 358                 DEBUG(0, ("smb_acl_to_posix: ACL %s is invalid for set (%s)\n",
 359                           acl_string, strerror(errno)));
 360                 SAFE_FREE(acl_string);
 361                 goto fail;
 362         }
 363
 364         return result;
 365
 366  fail:
 367         if (result != NULL) {
 368                 acl_free(result);
 369         }
 370         return NULL;
 371 }
 372
 373 /* VFS operations structure */
 374
 375 static struct vfs_fn_pointers posixacl_fns = {
 376         .sys_acl_get_file_fn = posixacl_sys_acl_get_file,
 377         .sys_acl_get_fd_fn = posixacl_sys_acl_get_fd,
 378         .sys_acl_blob_get_file_fn = posix_sys_acl_blob_get_file,
 379         .sys_acl_blob_get_fd_fn = posix_sys_acl_blob_get_fd,
 380         .sys_acl_set_file_fn = posixacl_sys_acl_set_file,
 381         .sys_acl_set_fd_fn = posixacl_sys_acl_set_fd,
 382         .sys_acl_delete_def_file_fn = posixacl_sys_acl_delete_def_file,
 383 };
 384
 385 static_decl_vfs;
 386 NTSTATUS vfs_posixacl_init(TALLOC_CTX *ctx)
 387 {
 388         return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "posixacl",
 389                                 &posixacl_fns);
 390 }