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                                 /* FALL TROUGH */
 190                         case SMB_ACL_USER_OBJ:
 191                                 tag = "user";
 192                                 break;
 193
 194                         case SMB_ACL_GROUP:
 195                                 if ((gr = getgrgid(ap->info.group.gid)) == NULL) {
 196                                         slprintf(idbuf, sizeof(idbuf)-1, "%ld",
 197                                                 (long)ap->info.group.gid);
 198                                         id = idbuf;
 199                                 } else {
 200                                         id = gr->gr_name;
 201                                 }
 202                                 /* FALL TROUGH */
 203                         case SMB_ACL_GROUP_OBJ:
 204                                 tag = "group";
 205                                 break;
 206
 207                         case SMB_ACL_OTHER:
 208                                 tag = "other";
 209                                 break;
 210
 211                         case SMB_ACL_MASK:
 212                                 tag = "mask";
 213                                 break;
 214
 215                 }
 216
 217                 perms[0] = (ap->a_perm & SMB_ACL_READ) ? 'r' : '-';
 218                 perms[1] = (ap->a_perm & SMB_ACL_WRITE) ? 'w' : '-';
 219                 perms[2] = (ap->a_perm & SMB_ACL_EXECUTE) ? 'x' : '-';
 220                 perms[3] = '\0';
 221
 222                 /*          <tag>      :  <qualifier>   :  rwx \n  \0 */
 223                 nbytes = strlen(tag) + 1 + strlen(id) + 1 + 3 + 1 + 1;
 224
 225                 /*
 226                  * If this entry would overflow the buffer
 227                  * allocate enough additional memory for this
 228                  * entry and an estimate of another 20 bytes
 229                  * for each entry still to be processed
 230                  */
 231                 if ((len + nbytes) > maxlen) {
 232                         maxlen += nbytes + 20 * (acl_d->count - i);
 233                         if ((text = (char *)SMB_REALLOC(text, maxlen)) == NULL) {
 234                                 errno = ENOMEM;
 235                                 return NULL;
 236                         }
 237                 }
 238
 239
 240                 slprintf(&text[len], nbytes, "%s:%s:%s\n", tag, id, perms);
 241                 len += (nbytes - 1);
 242         }
 243
 244         if (len_p)
 245                 *len_p = len;
 246
 247         return text;
 248 }
 249
 250 SMB_ACL_T sys_acl_init(TALLOC_CTX *mem_ctx)
 251 {
 252         SMB_ACL_T       a;
 253
 254         if ((a = talloc(mem_ctx, struct smb_acl_t)) == NULL) {
 255                 errno = ENOMEM;
 256                 return NULL;
 257         }
 258
 259         a->count = 0;
 260         a->next = -1;
 261
 262         a->acl = talloc_array(a, struct smb_acl_entry, 0);
 263         if (!a->acl) {
 264                 TALLOC_FREE(a);
 265                 errno = ENOMEM;
 266                 return NULL;
 267         }
 268
 269         return a;
 270 }
 271
 272 int sys_acl_create_entry(SMB_ACL_T *acl_p, SMB_ACL_ENTRY_T *entry_p)
 273 {
 274         SMB_ACL_T       acl_d;
 275         SMB_ACL_ENTRY_T entry_d;
 276         struct smb_acl_entry *acl;
 277
 278         if (acl_p == NULL || entry_p == NULL || (acl_d = *acl_p) == NULL) {
 279                 errno = EINVAL;
 280                 return -1;
 281         }
 282
 283         acl = talloc_realloc(acl_d, acl_d->acl, struct smb_acl_entry, acl_d->count+1);
 284         if (!acl) {
 285                 errno = ENOMEM;
 286                 return -1;
 287         }
 288         acl_d->acl = acl;
 289         entry_d         = &acl_d->acl[acl_d->count];
 290         entry_d->a_type = SMB_ACL_TAG_INVALID;
 291         entry_d->a_perm = 0;
 292         *entry_p        = entry_d;
 293
 294         acl_d->count++;
 295         return 0;
 296 }
 297
 298 int sys_acl_set_tag_type(SMB_ACL_ENTRY_T entry_d, SMB_ACL_TAG_T tag_type)
 299 {
 300         switch (tag_type) {
 301                 case SMB_ACL_USER:
 302                 case SMB_ACL_USER_OBJ:
 303                 case SMB_ACL_GROUP:
 304                 case SMB_ACL_GROUP_OBJ:
 305                 case SMB_ACL_OTHER:
 306                 case SMB_ACL_MASK:
 307                         entry_d->a_type = tag_type;
 308                         break;
 309                 default:
 310                         errno = EINVAL;
 311                         return -1;
 312                 }
 313
 314         return 0;
 315 }
 316
 317 int sys_acl_set_qualifier(SMB_ACL_ENTRY_T entry_d, void *qual_p)
 318 {
 319         if (entry_d->a_type == SMB_ACL_USER) {
 320                 entry_d->info.user.uid = *((uid_t *)qual_p);
 321                 return 0;
 322                 }
 323         if (entry_d->a_type == SMB_ACL_GROUP) {
 324                 entry_d->info.group.gid = *((gid_t *)qual_p);
 325                 return 0;
 326         }
 327
 328         errno = EINVAL;
 329         return -1;
 330 }
 331
 332 int sys_acl_set_permset(SMB_ACL_ENTRY_T entry_d, SMB_ACL_PERMSET_T permset_d)
 333 {
 334         if (*permset_d & ~(SMB_ACL_READ|SMB_ACL_WRITE|SMB_ACL_EXECUTE)) {
 335                 errno = EINVAL;
 336                 return -1;
 337         }
 338
 339         entry_d->a_perm = *permset_d;
 340
 341         return 0;
 342 }
 343
 344 int sys_acl_free_text(char *text)
 345 {
 346         SAFE_FREE(text);
 347         return 0;
 348 }
 349
 350 int sys_acl_valid(SMB_ACL_T acl_d)
 351 {
 352         errno = EINVAL;
 353         return -1;
 354 }
 355
 356 /*
 357  * acl_get_file, acl_get_fd, acl_set_file, acl_set_fd and
 358  * sys_acl_delete_def_file are to be redirected to the default
 359  * statically-bound acl vfs module, but they are replacable.
 360  */
 361
 362 #if defined(HAVE_POSIX_ACLS)
 363
 364 SMB_ACL_T sys_acl_get_file(vfs_handle_struct *handle,
 365                            const char *path_p, SMB_ACL_TYPE_T type, TALLOC_CTX *mem_ctx)
 366 {
 367         return posixacl_sys_acl_get_file(handle, path_p, type, mem_ctx);
 368 }
 369
 370 SMB_ACL_T sys_acl_get_fd(vfs_handle_struct *handle, files_struct *fsp, TALLOC_CTX *mem_ctx)
 371 {
 372         return posixacl_sys_acl_get_fd(handle, fsp, mem_ctx);
 373 }
 374
 375 int sys_acl_set_file(vfs_handle_struct *handle,
 376                      const char *name, SMB_ACL_TYPE_T type, SMB_ACL_T acl_d)
 377 {
 378         return posixacl_sys_acl_set_file(handle, name, type, acl_d);
 379 }
 380
 381 int sys_acl_set_fd(vfs_handle_struct *handle, files_struct *fsp,
 382                    SMB_ACL_T acl_d)
 383 {
 384         return posixacl_sys_acl_set_fd(handle, fsp, acl_d);
 385 }
 386
 387 int sys_acl_delete_def_file(vfs_handle_struct *handle,
 388                             const char *path)
 389 {
 390         return posixacl_sys_acl_delete_def_file(handle, path);
 391 }
 392
 393 #elif defined(HAVE_AIX_ACLS)
 394
 395 SMB_ACL_T sys_acl_get_file(vfs_handle_struct *handle,
 396                            const char *path_p, SMB_ACL_TYPE_T type,
 397                            TALLOC_CTX *mem_ctx)
 398 {
 399         return aixacl_sys_acl_get_file(handle, path_p, type, mem_ctx);
 400 }
 401
 402 SMB_ACL_T sys_acl_get_fd(vfs_handle_struct *handle, files_struct *fsp,
 403                            TALLOC_CTX *mem_ctx)
 404 {
 405         return aixacl_sys_acl_get_fd(handle, fsp, mem_ctx);
 406 }
 407
 408 int sys_acl_set_file(vfs_handle_struct *handle,
 409                      const char *name, SMB_ACL_TYPE_T type, SMB_ACL_T acl_d)
 410 {
 411         return aixacl_sys_acl_set_file(handle, name, type, acl_d);
 412 }
 413
 414 int sys_acl_set_fd(vfs_handle_struct *handle, files_struct *fsp,
 415                    SMB_ACL_T acl_d)
 416 {
 417         return aixacl_sys_acl_set_fd(handle, fsp, acl_d);
 418 }
 419
 420 int sys_acl_delete_def_file(vfs_handle_struct *handle,
 421                             const char *path)
 422 {
 423         return aixacl_sys_acl_delete_def_file(handle, path);
 424 }
 425
 426 #elif defined(HAVE_TRU64_ACLS)
 427
 428 SMB_ACL_T sys_acl_get_file(vfs_handle_struct *handle,
 429                            const char *path_p, SMB_ACL_TYPE_T type,
 430                            TALLOC_CTX *mem_ctx)
 431 {
 432         return tru64acl_sys_acl_get_file(handle, path_p, type,
 433                                          mem_ctx);
 434 }
 435
 436 SMB_ACL_T sys_acl_get_fd(vfs_handle_struct *handle, files_struct *fsp,
 437                          TALLOC_CTX *mem_ctx)
 438 {
 439         return tru64acl_sys_acl_get_fd(handle, fsp, mem_ctx);
 440 }
 441
 442 int sys_acl_set_file(vfs_handle_struct *handle,
 443                      const char *name, SMB_ACL_TYPE_T type, SMB_ACL_T acl_d)
 444 {
 445         return tru64acl_sys_acl_set_file(handle, name, type, acl_d);
 446 }
 447
 448 int sys_acl_set_fd(vfs_handle_struct *handle, files_struct *fsp,
 449                    SMB_ACL_T acl_d)
 450 {
 451         return tru64acl_sys_acl_set_fd(handle, fsp, acl_d);
 452 }
 453
 454 int sys_acl_delete_def_file(vfs_handle_struct *handle,
 455                             const char *path)
 456 {
 457         return tru64acl_sys_acl_delete_def_file(handle, path);
 458 }
 459
 460 #elif defined(HAVE_SOLARIS_ACLS) || defined(HAVE_UNIXWARE_ACLS)
 461
 462 SMB_ACL_T sys_acl_get_file(vfs_handle_struct *handle,
 463                            const char *path_p, SMB_ACL_TYPE_T type,
 464                            TALLOC_CTX *mem_ctx)
 465 {
 466         return solarisacl_sys_acl_get_file(handle, path_p, type,
 467                                            mem_ctx);
 468 }
 469
 470 SMB_ACL_T sys_acl_get_fd(vfs_handle_struct *handle, files_struct *fsp,
 471                          TALLOC_CTX *mem_ctx)
 472 {
 473         return solarisacl_sys_acl_get_fd(handle, fsp,
 474                                          mem_ctx);
 475 }
 476
 477 int sys_acl_set_file(vfs_handle_struct *handle,
 478                      const char *name, SMB_ACL_TYPE_T type, SMB_ACL_T acl_d)
 479 {
 480         return solarisacl_sys_acl_set_file(handle, name, type, acl_d);
 481 }
 482
 483 int sys_acl_set_fd(vfs_handle_struct *handle, files_struct *fsp,
 484                    SMB_ACL_T acl_d)
 485 {
 486         return solarisacl_sys_acl_set_fd(handle, fsp, acl_d);
 487 }
 488
 489 int sys_acl_delete_def_file(vfs_handle_struct *handle,
 490                             const char *path)
 491 {
 492         return solarisacl_sys_acl_delete_def_file(handle, path);
 493 }
 494
 495 #elif defined(HAVE_HPUX_ACLS)
 496
 497 SMB_ACL_T sys_acl_get_file(vfs_handle_struct *handle,
 498                            const char *path_p, SMB_ACL_TYPE_T type,
 499                            TALLOC_CTX *mem_ctx)
 500 {
 501         return hpuxacl_sys_acl_get_file(handle, path_p, type, mem_ctx);
 502 }
 503
 504 SMB_ACL_T sys_acl_get_fd(vfs_handle_struct *handle, files_struct *fsp,
 505                            TALLOC_CTX *mem_ctx)
 506 {
 507         return hpuxacl_sys_acl_get_fd(handle, fsp, mem_ctx);
 508 }
 509
 510 int sys_acl_set_file(vfs_handle_struct *handle,
 511                      const char *name, SMB_ACL_TYPE_T type, SMB_ACL_T acl_d)
 512 {
 513         return hpuxacl_sys_acl_set_file(handle, name, type, acl_d);
 514 }
 515
 516 int sys_acl_set_fd(vfs_handle_struct *handle, files_struct *fsp,
 517                    SMB_ACL_T acl_d)
 518 {
 519         return hpuxacl_sys_acl_set_fd(handle, fsp, acl_d);
 520 }
 521
 522 int sys_acl_delete_def_file(vfs_handle_struct *handle,
 523                             const char *path)
 524 {
 525         return hpuxacl_sys_acl_delete_def_file(handle, path);
 526 }
 527
 528 #else /* No ACLs. */
 529
 530 SMB_ACL_T sys_acl_get_file(vfs_handle_struct *handle,
 531                            const char *path_p, SMB_ACL_TYPE_T type,
 532                            TALLOC_CTX *mem_ctx)
 533 {
 534 #ifdef ENOTSUP
 535         errno = ENOTSUP;
 536 #else
 537         errno = ENOSYS;
 538 #endif
 539         return NULL;
 540 }
 541
 542 SMB_ACL_T sys_acl_get_fd(vfs_handle_struct *handle, files_struct *fsp,
 543                          TALLOC_CTX *mem_ctx)
 544 {
 545 #ifdef ENOTSUP
 546         errno = ENOTSUP;
 547 #else
 548         errno = ENOSYS;
 549 #endif
 550         return NULL;
 551 }
 552
 553 int sys_acl_set_file(vfs_handle_struct *handle,
 554                      const char *name, SMB_ACL_TYPE_T type, SMB_ACL_T acl_d)
 555 {
 556 #ifdef ENOTSUP
 557         errno = ENOTSUP;
 558 #else
 559         errno = ENOSYS;
 560 #endif
 561         return -1;
 562 }
 563
 564 int sys_acl_set_fd(vfs_handle_struct *handle, files_struct *fsp,
 565                    SMB_ACL_T acl_d)
 566 {
 567 #ifdef ENOTSUP
 568         errno = ENOTSUP;
 569 #else
 570         errno = ENOSYS;
 571 #endif
 572         return -1;
 573 }
 574
 575 int sys_acl_delete_def_file(vfs_handle_struct *handle,
 576                             const char *path)
 577 {
 578 #ifdef ENOTSUP
 579         errno = ENOTSUP;
 580 #else
 581         errno = ENOSYS;
 582 #endif
 583         return -1;
 584 }
 585
 586 #endif
 587
 588 /************************************************************************
 589  Deliberately outside the ACL defines. Return 1 if this is a "no acls"
 590  errno, 0 if not.
 591 ************************************************************************/
 592
 593 int no_acl_syscall_error(int err)
 594 {
 595 #if defined(ENOSYS)
 596         if (err == ENOSYS) {
 597                 return 1;
 598         }
 599 #endif
 600 #if defined(ENOTSUP)
 601         if (err == ENOTSUP) {
 602                 return 1;
 603         }
 604 #endif
 605         return 0;
 606 }