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_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
 190                                 FALL_THROUGH;
 191                         case SMB_ACL_USER_OBJ:
 192                                 tag = "user";
 193                                 break;
 194
 195                         case SMB_ACL_GROUP:
 196                                 if ((gr = getgrgid(ap->info.group.gid)) == NULL) {
 197                                         slprintf(idbuf, sizeof(idbuf)-1, "%ld",
 198                                                 (long)ap->info.group.gid);
 199                                         id = idbuf;
 200                                 } else {
 201                                         id = gr->gr_name;
 202                                 }
 203
 204                                 FALL_THROUGH;
 205                         case SMB_ACL_GROUP_OBJ:
 206                                 tag = "group";
 207                                 break;
 208
 209                         case SMB_ACL_OTHER:
 210                                 tag = "other";
 211                                 break;
 212
 213                         case SMB_ACL_MASK:
 214                                 tag = "mask";
 215                                 break;
 216
 217                 }
 218
 219                 perms[0] = (ap->a_perm & SMB_ACL_READ) ? 'r' : '-';
 220                 perms[1] = (ap->a_perm & SMB_ACL_WRITE) ? 'w' : '-';
 221                 perms[2] = (ap->a_perm & SMB_ACL_EXECUTE) ? 'x' : '-';
 222                 perms[3] = '\0';
 223
 224                 /*          <tag>      :  <qualifier>   :  rwx \n  \0 */
 225                 nbytes = strlen(tag) + 1 + strlen(id) + 1 + 3 + 1 + 1;
 226
 227                 /*
 228                  * If this entry would overflow the buffer
 229                  * allocate enough additional memory for this
 230                  * entry and an estimate of another 20 bytes
 231                  * for each entry still to be processed
 232                  */
 233                 if ((len + nbytes) > maxlen) {
 234                         maxlen += nbytes + 20 * (acl_d->count - i);
 235                         if ((text = (char *)SMB_REALLOC(text, maxlen)) == NULL) {
 236                                 errno = ENOMEM;
 237                                 return NULL;
 238                         }
 239                 }
 240
 241
 242                 slprintf(&text[len], nbytes, "%s:%s:%s\n", tag, id, perms);
 243                 len += (nbytes - 1);
 244         }
 245
 246         if (len_p)
 247                 *len_p = len;
 248
 249         return text;
 250 }
 251
 252 SMB_ACL_T sys_acl_init(TALLOC_CTX *mem_ctx)
 253 {
 254         SMB_ACL_T       a;
 255
 256         if ((a = talloc(mem_ctx, struct smb_acl_t)) == NULL) {
 257                 errno = ENOMEM;
 258                 return NULL;
 259         }
 260
 261         a->count = 0;
 262         a->next = -1;
 263
 264         a->acl = talloc_array(a, struct smb_acl_entry, 0);
 265         if (!a->acl) {
 266                 TALLOC_FREE(a);
 267                 errno = ENOMEM;
 268                 return NULL;
 269         }
 270
 271         return a;
 272 }
 273
 274 int sys_acl_create_entry(SMB_ACL_T *acl_p, SMB_ACL_ENTRY_T *entry_p)
 275 {
 276         SMB_ACL_T       acl_d;
 277         SMB_ACL_ENTRY_T entry_d;
 278         struct smb_acl_entry *acl;
 279
 280         if (acl_p == NULL || entry_p == NULL || (acl_d = *acl_p) == NULL) {
 281                 errno = EINVAL;
 282                 return -1;
 283         }
 284
 285         acl = talloc_realloc(acl_d, acl_d->acl, struct smb_acl_entry, acl_d->count+1);
 286         if (!acl) {
 287                 errno = ENOMEM;
 288                 return -1;
 289         }
 290         acl_d->acl = acl;
 291         entry_d         = &acl_d->acl[acl_d->count];
 292         entry_d->a_type = SMB_ACL_TAG_INVALID;
 293         entry_d->a_perm = 0;
 294         *entry_p        = entry_d;
 295
 296         acl_d->count++;
 297         return 0;
 298 }
 299
 300 int sys_acl_set_tag_type(SMB_ACL_ENTRY_T entry_d, SMB_ACL_TAG_T tag_type)
 301 {
 302         switch (tag_type) {
 303                 case SMB_ACL_USER:
 304                 case SMB_ACL_USER_OBJ:
 305                 case SMB_ACL_GROUP:
 306                 case SMB_ACL_GROUP_OBJ:
 307                 case SMB_ACL_OTHER:
 308                 case SMB_ACL_MASK:
 309                         entry_d->a_type = tag_type;
 310                         break;
 311                 default:
 312                         errno = EINVAL;
 313                         return -1;
 314                 }
 315
 316         return 0;
 317 }
 318
 319 int sys_acl_set_qualifier(SMB_ACL_ENTRY_T entry_d, void *qual_p)
 320 {
 321         if (entry_d->a_type == SMB_ACL_USER) {
 322                 entry_d->info.user.uid = *((uid_t *)qual_p);
 323                 return 0;
 324         }
 325         if (entry_d->a_type == SMB_ACL_GROUP) {
 326                 entry_d->info.group.gid = *((gid_t *)qual_p);
 327                 return 0;
 328         }
 329
 330         errno = EINVAL;
 331         return -1;
 332 }
 333
 334 int sys_acl_set_permset(SMB_ACL_ENTRY_T entry_d, SMB_ACL_PERMSET_T permset_d)
 335 {
 336         if (*permset_d & ~(SMB_ACL_READ|SMB_ACL_WRITE|SMB_ACL_EXECUTE)) {
 337                 errno = EINVAL;
 338                 return -1;
 339         }
 340
 341         entry_d->a_perm = *permset_d;
 342
 343         return 0;
 344 }
 345
 346 int sys_acl_free_text(char *text)
 347 {
 348         SAFE_FREE(text);
 349         return 0;
 350 }
 351
 352 int sys_acl_valid(SMB_ACL_T acl_d)
 353 {
 354         errno = EINVAL;
 355         return -1;
 356 }
 357
 358 /*
 359  * acl_get_file, acl_get_fd, acl_set_file, acl_set_fd and
 360  * sys_acl_delete_def_file are to be redirected to the default
 361  * statically-bound acl vfs module, but they are replacable.
 362  */
 363
 364 #if defined(HAVE_POSIX_ACLS)
 365
 366 SMB_ACL_T sys_acl_get_file(vfs_handle_struct *handle,
 367                         const struct smb_filename *smb_fname,
 368                         SMB_ACL_TYPE_T type,
 369                         TALLOC_CTX *mem_ctx)
 370 {
 371         return posixacl_sys_acl_get_file(handle, smb_fname, type, mem_ctx);
 372 }
 373
 374 SMB_ACL_T sys_acl_get_fd(vfs_handle_struct *handle, files_struct *fsp, TALLOC_CTX *mem_ctx)
 375 {
 376         return posixacl_sys_acl_get_fd(handle, fsp, mem_ctx);
 377 }
 378
 379 int sys_acl_set_file(vfs_handle_struct *handle,
 380                         const struct smb_filename *smb_fname,
 381                         SMB_ACL_TYPE_T type,
 382                         SMB_ACL_T acl_d)
 383 {
 384         return posixacl_sys_acl_set_file(handle, smb_fname, type, acl_d);
 385 }
 386
 387 int sys_acl_set_fd(vfs_handle_struct *handle, files_struct *fsp,
 388                    SMB_ACL_T acl_d)
 389 {
 390         return posixacl_sys_acl_set_fd(handle, fsp, acl_d);
 391 }
 392
 393 int sys_acl_delete_def_file(vfs_handle_struct *handle,
 394                         const struct smb_filename *smb_fname)
 395 {
 396         return posixacl_sys_acl_delete_def_file(handle, smb_fname);
 397 }
 398
 399 #elif defined(HAVE_AIX_ACLS)
 400
 401 SMB_ACL_T sys_acl_get_file(vfs_handle_struct *handle,
 402                         const struct smb_filename *smb_fname,
 403                         SMB_ACL_TYPE_T type,
 404                         TALLOC_CTX *mem_ctx)
 405 {
 406         return aixacl_sys_acl_get_file(handle, smb_fname, type, mem_ctx);
 407 }
 408
 409 SMB_ACL_T sys_acl_get_fd(vfs_handle_struct *handle, files_struct *fsp,
 410                            TALLOC_CTX *mem_ctx)
 411 {
 412         return aixacl_sys_acl_get_fd(handle, fsp, mem_ctx);
 413 }
 414
 415 int sys_acl_set_file(vfs_handle_struct *handle,
 416                         const struct smb_filename *smb_fname,
 417                         SMB_ACL_TYPE_T type,
 418                         SMB_ACL_T acl_d)
 419 {
 420         return aixacl_sys_acl_set_file(handle, smb_fname, type, acl_d);
 421 }
 422
 423 int sys_acl_set_fd(vfs_handle_struct *handle, files_struct *fsp,
 424                    SMB_ACL_T acl_d)
 425 {
 426         return aixacl_sys_acl_set_fd(handle, fsp, acl_d);
 427 }
 428
 429 int sys_acl_delete_def_file(vfs_handle_struct *handle,
 430                                 const struct smb_filename *smb_fname)
 431 {
 432         return aixacl_sys_acl_delete_def_file(handle, smb_fname);
 433 }
 434
 435 #elif defined(HAVE_TRU64_ACLS)
 436
 437 SMB_ACL_T sys_acl_get_file(vfs_handle_struct *handle,
 438                         const struct smb_filename *smb_fname,
 439                         SMB_ACL_TYPE_T type,
 440                         TALLOC_CTX *mem_ctx)
 441 {
 442         return tru64acl_sys_acl_get_file(handle, smb_fname, type,
 443                                          mem_ctx);
 444 }
 445
 446 SMB_ACL_T sys_acl_get_fd(vfs_handle_struct *handle, files_struct *fsp,
 447                          TALLOC_CTX *mem_ctx)
 448 {
 449         return tru64acl_sys_acl_get_fd(handle, fsp, mem_ctx);
 450 }
 451
 452 int sys_acl_set_file(vfs_handle_struct *handle,
 453                         const struct smb_filename *smb_fname,
 454                         SMB_ACL_TYPE_T type,
 455                         SMB_ACL_T acl_d)
 456 {
 457         return tru64acl_sys_acl_set_file(handle, smb_fname, type, acl_d);
 458 }
 459
 460 int sys_acl_set_fd(vfs_handle_struct *handle, files_struct *fsp,
 461                    SMB_ACL_T acl_d)
 462 {
 463         return tru64acl_sys_acl_set_fd(handle, fsp, acl_d);
 464 }
 465
 466 int sys_acl_delete_def_file(vfs_handle_struct *handle,
 467                                 const struct smb_filename *smb_fname)
 468 {
 469         return tru64acl_sys_acl_delete_def_file(handle, smb_fname);
 470 }
 471
 472 #elif defined(HAVE_SOLARIS_UNIXWARE_ACLS)
 473
 474 SMB_ACL_T sys_acl_get_file(vfs_handle_struct *handle,
 475                         const struct smb_filename *smb_fname,
 476                         SMB_ACL_TYPE_T type,
 477                         TALLOC_CTX *mem_ctx)
 478 {
 479         return solarisacl_sys_acl_get_file(handle, smb_fname, type,
 480                                            mem_ctx);
 481 }
 482
 483 SMB_ACL_T sys_acl_get_fd(vfs_handle_struct *handle, files_struct *fsp,
 484                          TALLOC_CTX *mem_ctx)
 485 {
 486         return solarisacl_sys_acl_get_fd(handle, fsp,
 487                                          mem_ctx);
 488 }
 489
 490 int sys_acl_set_file(vfs_handle_struct *handle,
 491                         const struct smb_filename *smb_fname,
 492                         SMB_ACL_TYPE_T type,
 493                         SMB_ACL_T acl_d)
 494 {
 495         return solarisacl_sys_acl_set_file(handle, smb_fname, type, acl_d);
 496 }
 497
 498 int sys_acl_set_fd(vfs_handle_struct *handle, files_struct *fsp,
 499                    SMB_ACL_T acl_d)
 500 {
 501         return solarisacl_sys_acl_set_fd(handle, fsp, acl_d);
 502 }
 503
 504 int sys_acl_delete_def_file(vfs_handle_struct *handle,
 505                                 const struct smb_filename *smb_fname)
 506 {
 507         return solarisacl_sys_acl_delete_def_file(handle, smb_fname);
 508 }
 509
 510 #elif defined(HAVE_HPUX_ACLS)
 511
 512 SMB_ACL_T sys_acl_get_file(vfs_handle_struct *handle,
 513                         const struct smb_filename *smb_fname,
 514                         SMB_ACL_TYPE_T type,
 515                         TALLOC_CTX *mem_ctx)
 516 {
 517         return hpuxacl_sys_acl_get_file(handle, smb_fname, type, mem_ctx);
 518 }
 519
 520 SMB_ACL_T sys_acl_get_fd(vfs_handle_struct *handle, files_struct *fsp,
 521                            TALLOC_CTX *mem_ctx)
 522 {
 523         return hpuxacl_sys_acl_get_fd(handle, fsp, mem_ctx);
 524 }
 525
 526 int sys_acl_set_file(vfs_handle_struct *handle,
 527                         const struct smb_filename *smb_fname,
 528                         SMB_ACL_TYPE_T type,
 529                         SMB_ACL_T acl_d)
 530 {
 531         return hpuxacl_sys_acl_set_file(handle, smb_fname, type, acl_d);
 532 }
 533
 534 int sys_acl_set_fd(vfs_handle_struct *handle, files_struct *fsp,
 535                    SMB_ACL_T acl_d)
 536 {
 537         return hpuxacl_sys_acl_set_fd(handle, fsp, acl_d);
 538 }
 539
 540 int sys_acl_delete_def_file(vfs_handle_struct *handle,
 541                                 const struct smb_filename *smb_fname)
 542 {
 543         return hpuxacl_sys_acl_delete_def_file(handle, smb_fname);
 544 }
 545
 546 #else /* No ACLs. */
 547
 548 SMB_ACL_T sys_acl_get_file(vfs_handle_struct *handle,
 549                         const struct smb_filename *smb_fname,
 550                         SMB_ACL_TYPE_T type,
 551                         TALLOC_CTX *mem_ctx)
 552 {
 553 #ifdef ENOTSUP
 554         errno = ENOTSUP;
 555 #else
 556         errno = ENOSYS;
 557 #endif
 558         return NULL;
 559 }
 560
 561 SMB_ACL_T sys_acl_get_fd(vfs_handle_struct *handle, files_struct *fsp,
 562                          TALLOC_CTX *mem_ctx)
 563 {
 564 #ifdef ENOTSUP
 565         errno = ENOTSUP;
 566 #else
 567         errno = ENOSYS;
 568 #endif
 569         return NULL;
 570 }
 571
 572 int sys_acl_set_file(vfs_handle_struct *handle,
 573                         const struct smb_filename *smb_fname,
 574                         SMB_ACL_TYPE_T type,
 575                         SMB_ACL_T acl_d)
 576 {
 577 #ifdef ENOTSUP
 578         errno = ENOTSUP;
 579 #else
 580         errno = ENOSYS;
 581 #endif
 582         return -1;
 583 }
 584
 585 int sys_acl_set_fd(vfs_handle_struct *handle, files_struct *fsp,
 586                    SMB_ACL_T acl_d)
 587 {
 588 #ifdef ENOTSUP
 589         errno = ENOTSUP;
 590 #else
 591         errno = ENOSYS;
 592 #endif
 593         return -1;
 594 }
 595
 596 int sys_acl_delete_def_file(vfs_handle_struct *handle,
 597                                 const struct smb_filename *smb_fname)
 598 {
 599 #ifdef ENOTSUP
 600         errno = ENOTSUP;
 601 #else
 602         errno = ENOSYS;
 603 #endif
 604         return -1;
 605 }
 606
 607 #endif
 608
 609 /************************************************************************
 610  Deliberately outside the ACL defines. Return 1 if this is a "no acls"
 611  errno, 0 if not.
 612 ************************************************************************/
 613
 614 int no_acl_syscall_error(int err)
 615 {
 616 #if defined(ENOSYS)
 617         if (err == ENOSYS) {
 618                 return 1;
 619         }
 620 #endif
 621 #if defined(ENOTSUP)
 622         if (err == ENOTSUP) {
 623                 return 1;
 624         }
 625 #endif
 626         return 0;
 627 }