source3/lib/sysacls.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Samba system utilities for ACL support.
   4    Copyright (C) Jeremy Allison 2000.
   5    Copyright (C) Volker Lendecke 2006
   6    Copyright (C) Michael Adam 2006,2008
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22 #include "includes.h"
  23 #include "system/passwd.h"
  24
  25 #if defined(HAVE_POSIX_ACLS)
  26 #include "modules/vfs_posixacl.h"
  27 #endif
  28
  29 #if defined(HAVE_TRU64_ACLS)
  30 #include "modules/vfs_tru64acl.h"
  31 #endif
  32
  33 #if defined(HAVE_SOLARIS_ACLS) || defined(HAVE_UNIXWARE_ACLS)
  34 #include "modules/vfs_solarisacl.h"
  35 #endif
  36
  37 #if defined(HAVE_HPUX_ACLS)
  38 #include "modules/vfs_hpuxacl.h"
  39 #endif
  40
  41 #undef  DBGC_CLASS
  42 #define DBGC_CLASS DBGC_ACLS
  43
  44 /*
  45  * Note that while this code implements sufficient functionality
  46  * to support the sys_acl_* interfaces it does not provide all
  47  * of the semantics of the POSIX ACL interfaces.
  48  *
  49  * In particular, an ACL entry descriptor (SMB_ACL_ENTRY_T) returned
  50  * from a call to sys_acl_get_entry() should not be assumed to be
  51  * valid after calling any of the following functions, which may
  52  * reorder the entries in the ACL.
  53  *
  54  *      sys_acl_valid()
  55  *      sys_acl_set_file()
  56  *      sys_acl_set_fd()
  57  */
  58
  59 int sys_acl_get_entry(SMB_ACL_T acl_d, int entry_id, SMB_ACL_ENTRY_T *entry_p)
  60 {
  61         if (entry_id != SMB_ACL_FIRST_ENTRY && entry_id != SMB_ACL_NEXT_ENTRY) {
  62                 errno = EINVAL;
  63                 return -1;
  64         }
  65
  66         if (entry_p == NULL) {
  67                 errno = EINVAL;
  68                 return -1;
  69         }
  70
  71         if (entry_id == SMB_ACL_FIRST_ENTRY) {
  72                 acl_d->next = 0;
  73         }
  74
  75         if (acl_d->next < 0) {
  76                 errno = EINVAL;
  77                 return -1;
  78         }
  79
  80         if (acl_d->next >= acl_d->count) {
  81                 return 0;
  82         }
  83
  84         *entry_p = &acl_d->acl[acl_d->next++];
  85
  86         return 1;
  87 }
  88
  89 int sys_acl_get_tag_type(SMB_ACL_ENTRY_T entry_d, SMB_ACL_TAG_T *type_p)
  90 {
  91         *type_p = entry_d->a_type;
  92
  93         return 0;
  94 }
  95
  96 int sys_acl_get_permset(SMB_ACL_ENTRY_T entry_d, SMB_ACL_PERMSET_T *permset_p)
  97 {
  98         *permset_p = &entry_d->a_perm;
  99
 100         return 0;
 101 }
 102
 103 void *sys_acl_get_qualifier(SMB_ACL_ENTRY_T entry_d)
 104 {
 105         if (entry_d->a_type == SMB_ACL_USER) {
 106                 return &entry_d->info.user.uid;
 107                 }
 108
 109         if (entry_d->a_type == SMB_ACL_GROUP) {
 110                 return &entry_d->info.group.gid;
 111         }
 112
 113         errno = EINVAL;
 114                 return NULL;
 115 }
 116
 117 int sys_acl_clear_perms(SMB_ACL_PERMSET_T permset_d)
 118 {
 119         *permset_d = 0;
 120
 121         return 0;
 122 }
 123
 124 int sys_acl_add_perm(SMB_ACL_PERMSET_T permset_d, SMB_ACL_PERM_T perm)
 125 {
 126         if (perm != SMB_ACL_READ && perm != SMB_ACL_WRITE
 127             && perm != SMB_ACL_EXECUTE) {
 128                 errno = EINVAL;
 129                 return -1;
 130                 }
 131
 132         if (permset_d == NULL) {
 133                 errno = EINVAL;
 134                 return -1;
 135         }
 136
 137         *permset_d |= perm;
 138
 139         return 0;
 140 }
 141
 142 int sys_acl_get_perm(SMB_ACL_PERMSET_T permset_d, SMB_ACL_PERM_T perm)
 143 {
 144         return *permset_d & perm;
 145 }
 146
 147 char *sys_acl_to_text(const struct smb_acl_t *acl_d, ssize_t *len_p)
 148 {
 149         int     i;
 150         int     len, maxlen;
 151         char    *text;
 152
 153         /*
 154          * use an initial estimate of 20 bytes per ACL entry
 155          * when allocating memory for the text representation
 156          * of the ACL
 157          */
 158         len     = 0;
 159         maxlen  = 20 * acl_d->count;
 160         if ((text = (char *)SMB_MALLOC(maxlen)) == NULL) {
 161                 errno = ENOMEM;
 162                 return NULL;
 163         }
 164
 165         for (i = 0; i < acl_d->count; i++) {
 166                 struct smb_acl_entry *ap = &acl_d->acl[i];
 167                 struct group    *gr;
 168                 char            tagbuf[12];
 169                 char            idbuf[12];
 170                 const char      *tag;
 171                 const char      *id     = "";
 172                 char            perms[4];
 173                 int             nbytes;
 174
 175                 switch (ap->a_type) {
 176                         /*
 177                          * for debugging purposes it's probably more
 178                          * useful to dump unknown tag types rather
 179                          * than just returning an error
 180                          */
 181                         default:
 182                                 slprintf(tagbuf, sizeof(tagbuf)-1, "0x%x",
 183                                          ap->a_type);
 184                                 tag = tagbuf;
 185                                 break;
 186
 187                         case SMB_ACL_USER:
 188                                 id = uidtoname(ap->info.user.uid);
 189                         case SMB_ACL_USER_OBJ:
 190                                 tag = "user";
 191                                 break;
 192
 193                         case SMB_ACL_GROUP:
 194                                 if ((gr = getgrgid(ap->info.group.gid)) == NULL) {
 195                                         slprintf(idbuf, sizeof(idbuf)-1, "%ld",
 196                                                 (long)ap->info.group.gid);
 197                                         id = idbuf;
 198                                 } else {
 199                                         id = gr->gr_name;
 200                                 }
 201                         case SMB_ACL_GROUP_OBJ:
 202                                 tag = "group";
 203                                 break;
 204
 205                         case SMB_ACL_OTHER:
 206                                 tag = "other";
 207                                 break;
 208
 209                         case SMB_ACL_MASK:
 210                                 tag = "mask";
 211                                 break;
 212
 213                 }
 214
 215                 perms[0] = (ap->a_perm & SMB_ACL_READ) ? 'r' : '-';
 216                 perms[1] = (ap->a_perm & SMB_ACL_WRITE) ? 'w' : '-';
 217                 perms[2] = (ap->a_perm & SMB_ACL_EXECUTE) ? 'x' : '-';
 218                 perms[3] = '\0';
 219
 220                 /*          <tag>      :  <qualifier>   :  rwx \n  \0 */
 221                 nbytes = strlen(tag) + 1 + strlen(id) + 1 + 3 + 1 + 1;
 222
 223                 /*
 224                  * If this entry would overflow the buffer
 225                  * allocate enough additional memory for this
 226                  * entry and an estimate of another 20 bytes
 227                  * for each entry still to be processed
 228                  */
 229                 if ((len + nbytes) > maxlen) {
 230                         maxlen += nbytes + 20 * (acl_d->count - i);
 231                         if ((text = (char *)SMB_REALLOC(text, maxlen)) == NULL) {
 232                                 errno = ENOMEM;
 233                                 return NULL;
 234                         }
 235                 }
 236
 237
 238                 slprintf(&text[len], nbytes, "%s:%s:%s\n", tag, id, perms);
 239                 len += (nbytes - 1);
 240         }
 241
 242         if (len_p)
 243                 *len_p = len;
 244
 245         return text;
 246 }
 247
 248 SMB_ACL_T sys_acl_init(TALLOC_CTX *mem_ctx)
 249 {
 250         SMB_ACL_T       a;
 251
 252         if ((a = talloc(mem_ctx, struct smb_acl_t)) == NULL) {
 253                 errno = ENOMEM;
 254                 return NULL;
 255         }
 256
 257         a->count = 0;
 258         a->next = -1;
 259
 260         a->acl = talloc_array(a, struct smb_acl_entry, 0);
 261         if (!a->acl) {
 262                 TALLOC_FREE(a);
 263                 errno = ENOMEM;
 264                 return NULL;
 265         }
 266
 267         return a;
 268 }
 269
 270 int sys_acl_create_entry(SMB_ACL_T *acl_p, SMB_ACL_ENTRY_T *entry_p)
 271 {
 272         SMB_ACL_T       acl_d;
 273         SMB_ACL_ENTRY_T entry_d;
 274         struct smb_acl_entry *acl;
 275
 276         if (acl_p == NULL || entry_p == NULL || (acl_d = *acl_p) == NULL) {
 277                 errno = EINVAL;
 278                 return -1;
 279         }
 280
 281         acl = talloc_realloc(acl_d, acl_d->acl, struct smb_acl_entry, acl_d->count+1);
 282         if (!acl) {
 283                 errno = ENOMEM;
 284                 return -1;
 285         }
 286         acl_d->acl = acl;
 287         entry_d         = &acl_d->acl[acl_d->count];
 288         entry_d->a_type = SMB_ACL_TAG_INVALID;
 289         entry_d->a_perm = 0;
 290         *entry_p        = entry_d;
 291
 292         acl_d->count++;
 293         return 0;
 294 }
 295
 296 int sys_acl_set_tag_type(SMB_ACL_ENTRY_T entry_d, SMB_ACL_TAG_T tag_type)
 297 {
 298         switch (tag_type) {
 299                 case SMB_ACL_USER:
 300                 case SMB_ACL_USER_OBJ:
 301                 case SMB_ACL_GROUP:
 302                 case SMB_ACL_GROUP_OBJ:
 303                 case SMB_ACL_OTHER:
 304                 case SMB_ACL_MASK:
 305                         entry_d->a_type = tag_type;
 306                         break;
 307                 default:
 308                         errno = EINVAL;
 309                         return -1;
 310                 }
 311
 312         return 0;
 313 }
 314
 315 int sys_acl_set_qualifier(SMB_ACL_ENTRY_T entry_d, void *qual_p)
 316 {
 317         if (entry_d->a_type == SMB_ACL_USER) {
 318                 entry_d->info.user.uid = *((uid_t *)qual_p);
 319                 return 0;
 320                 }
 321         if (entry_d->a_type == SMB_ACL_GROUP) {
 322                 entry_d->info.group.gid = *((gid_t *)qual_p);
 323                 return 0;
 324         }
 325
 326         errno = EINVAL;
 327         return -1;
 328 }
 329
 330 int sys_acl_set_permset(SMB_ACL_ENTRY_T entry_d, SMB_ACL_PERMSET_T permset_d)
 331 {
 332         if (*permset_d & ~(SMB_ACL_READ|SMB_ACL_WRITE|SMB_ACL_EXECUTE)) {
 333                 errno = EINVAL;
 334                 return -1;
 335         }
 336
 337         entry_d->a_perm = *permset_d;
 338
 339         return 0;
 340 }
 341
 342 int sys_acl_free_text(char *text)
 343 {
 344         SAFE_FREE(text);
 345         return 0;
 346 }
 347
 348 int sys_acl_valid(SMB_ACL_T acl_d)
 349 {
 350         errno = EINVAL;
 351         return -1;
 352 }
 353
 354 /*
 355  * acl_get_file, acl_get_fd, acl_set_file, acl_set_fd and
 356  * sys_acl_delete_def_file are to be redirected to the default
 357  * statically-bound acl vfs module, but they are replacable.
 358  */
 359
 360 #if defined(HAVE_POSIX_ACLS)
 361
 362 SMB_ACL_T sys_acl_get_file(vfs_handle_struct *handle,
 363                            const char *path_p, SMB_ACL_TYPE_T type, TALLOC_CTX *mem_ctx)
 364 {
 365         return posixacl_sys_acl_get_file(handle, path_p, type, mem_ctx);
 366 }
 367
 368 SMB_ACL_T sys_acl_get_fd(vfs_handle_struct *handle, files_struct *fsp, TALLOC_CTX *mem_ctx)
 369 {
 370         return posixacl_sys_acl_get_fd(handle, fsp, mem_ctx);
 371 }
 372
 373 int sys_acl_set_file(vfs_handle_struct *handle,
 374                      const char *name, SMB_ACL_TYPE_T type, SMB_ACL_T acl_d)
 375 {
 376         return posixacl_sys_acl_set_file(handle, name, type, acl_d);
 377 }
 378
 379 int sys_acl_set_fd(vfs_handle_struct *handle, files_struct *fsp,
 380                    SMB_ACL_T acl_d)
 381 {
 382         return posixacl_sys_acl_set_fd(handle, fsp, acl_d);
 383 }
 384
 385 int sys_acl_delete_def_file(vfs_handle_struct *handle,
 386                             const char *path)
 387 {
 388         return posixacl_sys_acl_delete_def_file(handle, path);
 389 }
 390
 391 #elif defined(HAVE_AIX_ACLS)
 392
 393 SMB_ACL_T sys_acl_get_file(vfs_handle_struct *handle,
 394                            const char *path_p, SMB_ACL_TYPE_T type,
 395                            TALLOC_CTX *mem_ctx)
 396 {
 397         return aixacl_sys_acl_get_file(handle, path_p, type, mem_ctx);
 398 }
 399
 400 SMB_ACL_T sys_acl_get_fd(vfs_handle_struct *handle, files_struct *fsp,
 401                            TALLOC_CTX *mem_ctx)
 402 {
 403         return aixacl_sys_acl_get_fd(handle, fsp, mem_ctx);
 404 }
 405
 406 int sys_acl_set_file(vfs_handle_struct *handle,
 407                      const char *name, SMB_ACL_TYPE_T type, SMB_ACL_T acl_d)
 408 {
 409         return aixacl_sys_acl_set_file(handle, name, type, acl_d);
 410 }
 411
 412 int sys_acl_set_fd(vfs_handle_struct *handle, files_struct *fsp,
 413                    SMB_ACL_T acl_d)
 414 {
 415         return aixacl_sys_acl_set_fd(handle, fsp, acl_d);
 416 }
 417
 418 int sys_acl_delete_def_file(vfs_handle_struct *handle,
 419                             const char *path)
 420 {
 421         return aixacl_sys_acl_delete_def_file(handle, path);
 422 }
 423
 424 #elif defined(HAVE_TRU64_ACLS)
 425
 426 SMB_ACL_T sys_acl_get_file(vfs_handle_struct *handle,
 427                            const char *path_p, SMB_ACL_TYPE_T type,
 428                            TALLOC_CTX *mem_ctx)
 429 {
 430         return tru64acl_sys_acl_get_file(handle, path_p, type,
 431                                          mem_ctx);
 432 }
 433
 434 SMB_ACL_T sys_acl_get_fd(vfs_handle_struct *handle, files_struct *fsp,
 435                          TALLOC_CTX *mem_ctx)
 436 {
 437         return tru64acl_sys_acl_get_fd(handle, fsp, mem_ctx);
 438 }
 439
 440 int sys_acl_set_file(vfs_handle_struct *handle,
 441                      const char *name, SMB_ACL_TYPE_T type, SMB_ACL_T acl_d)
 442 {
 443         return tru64acl_sys_acl_set_file(handle, name, type, acl_d);
 444 }
 445
 446 int sys_acl_set_fd(vfs_handle_struct *handle, files_struct *fsp,
 447                    SMB_ACL_T acl_d)
 448 {
 449         return tru64acl_sys_acl_set_fd(handle, fsp, acl_d);
 450 }
 451
 452 int sys_acl_delete_def_file(vfs_handle_struct *handle,
 453                             const char *path)
 454 {
 455         return tru64acl_sys_acl_delete_def_file(handle, path);
 456 }
 457
 458 #elif defined(HAVE_SOLARIS_ACLS) || defined(HAVE_UNIXWARE_ACLS)
 459
 460 SMB_ACL_T sys_acl_get_file(vfs_handle_struct *handle,
 461                            const char *path_p, SMB_ACL_TYPE_T type,
 462                            TALLOC_CTX *mem_ctx)
 463 {
 464         return solarisacl_sys_acl_get_file(handle, path_p, type,
 465                                            mem_ctx);
 466 }
 467
 468 SMB_ACL_T sys_acl_get_fd(vfs_handle_struct *handle, files_struct *fsp,
 469                          TALLOC_CTX *mem_ctx)
 470 {
 471         return solarisacl_sys_acl_get_fd(handle, fsp,
 472                                          mem_ctx);
 473 }
 474
 475 int sys_acl_set_file(vfs_handle_struct *handle,
 476                      const char *name, SMB_ACL_TYPE_T type, SMB_ACL_T acl_d)
 477 {
 478         return solarisacl_sys_acl_set_file(handle, name, type, acl_d);
 479 }
 480
 481 int sys_acl_set_fd(vfs_handle_struct *handle, files_struct *fsp,
 482                    SMB_ACL_T acl_d)
 483 {
 484         return solarisacl_sys_acl_set_fd(handle, fsp, acl_d);
 485 }
 486
 487 int sys_acl_delete_def_file(vfs_handle_struct *handle,
 488                             const char *path)
 489 {
 490         return solarisacl_sys_acl_delete_def_file(handle, path);
 491 }
 492
 493 #elif defined(HAVE_HPUX_ACLS)
 494
 495 SMB_ACL_T sys_acl_get_file(vfs_handle_struct *handle,
 496                            const char *path_p, SMB_ACL_TYPE_T type,
 497                            TALLOC_CTX *mem_ctx)
 498 {
 499         return hpuxacl_sys_acl_get_file(handle, path_p, type, mem_ctx);
 500 }
 501
 502 SMB_ACL_T sys_acl_get_fd(vfs_handle_struct *handle, files_struct *fsp,
 503                            TALLOC_CTX *mem_ctx)
 504 {
 505         return hpuxacl_sys_acl_get_fd(handle, fsp, mem_ctx);
 506 }
 507
 508 int sys_acl_set_file(vfs_handle_struct *handle,
 509                      const char *name, SMB_ACL_TYPE_T type, SMB_ACL_T acl_d)
 510 {
 511         return hpuxacl_sys_acl_set_file(handle, name, type, acl_d);
 512 }
 513
 514 int sys_acl_set_fd(vfs_handle_struct *handle, files_struct *fsp,
 515                    SMB_ACL_T acl_d)
 516 {
 517         return hpuxacl_sys_acl_set_fd(handle, fsp, acl_d);
 518 }
 519
 520 int sys_acl_delete_def_file(vfs_handle_struct *handle,
 521                             const char *path)
 522 {
 523         return hpuxacl_sys_acl_delete_def_file(handle, path);
 524 }
 525
 526 #else /* No ACLs. */
 527
 528 SMB_ACL_T sys_acl_get_file(vfs_handle_struct *handle,
 529                            const char *path_p, SMB_ACL_TYPE_T type,
 530                            TALLOC_CTX *mem_ctx)
 531 {
 532 #ifdef ENOTSUP
 533         errno = ENOTSUP;
 534 #else
 535         errno = ENOSYS;
 536 #endif
 537         return NULL;
 538 }
 539
 540 SMB_ACL_T sys_acl_get_fd(vfs_handle_struct *handle, files_struct *fsp,
 541                          TALLOC_CTX *mem_ctx)
 542 {
 543 #ifdef ENOTSUP
 544         errno = ENOTSUP;
 545 #else
 546         errno = ENOSYS;
 547 #endif
 548         return NULL;
 549 }
 550
 551 int sys_acl_set_file(vfs_handle_struct *handle,
 552                      const char *name, SMB_ACL_TYPE_T type, SMB_ACL_T acl_d)
 553 {
 554 #ifdef ENOTSUP
 555         errno = ENOTSUP;
 556 #else
 557         errno = ENOSYS;
 558 #endif
 559         return -1;
 560 }
 561
 562 int sys_acl_set_fd(vfs_handle_struct *handle, files_struct *fsp,
 563                    SMB_ACL_T acl_d)
 564 {
 565 #ifdef ENOTSUP
 566         errno = ENOTSUP;
 567 #else
 568         errno = ENOSYS;
 569 #endif
 570         return -1;
 571 }
 572
 573 int sys_acl_delete_def_file(vfs_handle_struct *handle,
 574                             const char *path)
 575 {
 576 #ifdef ENOTSUP
 577         errno = ENOTSUP;
 578 #else
 579         errno = ENOSYS;
 580 #endif
 581         return -1;
 582 }
 583
 584 #endif
 585
 586 /************************************************************************
 587  Deliberately outside the ACL defines. Return 1 if this is a "no acls"
 588  errno, 0 if not.
 589 ************************************************************************/
 590
 591 int no_acl_syscall_error(int err)
 592 {
 593 #if defined(ENOSYS)
 594         if (err == ENOSYS) {
 595                 return 1;
 596         }
 597 #endif
 598 #if defined(ENOTSUP)
 599         if (err == ENOTSUP) {
 600                 return 1;
 601         }
 602 #endif
 603         return 0;
 604 }