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_SOLARIS_UNIXWARE_ACLS)
  30 #include "modules/vfs_solarisacl.h"
  31 #endif
  32
  33 #if defined(HAVE_HPUX_ACLS)
  34 #include "modules/vfs_hpuxacl.h"
  35 #endif
  36
  37 #if defined(HAVE_AIX_ACLS)
  38 #include "modules/vfs_aixacl.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_fd()
  56  */
  57
  58 int sys_acl_get_entry(SMB_ACL_T acl_d, int entry_id, SMB_ACL_ENTRY_T *entry_p)
  59 {
  60         if (entry_id != SMB_ACL_FIRST_ENTRY && entry_id != SMB_ACL_NEXT_ENTRY) {
  61                 errno = EINVAL;
  62                 return -1;
  63         }
  64
  65         if (entry_p == NULL) {
  66                 errno = EINVAL;
  67                 return -1;
  68         }
  69
  70         if (entry_id == SMB_ACL_FIRST_ENTRY) {
  71                 acl_d->next = 0;
  72         }
  73
  74         if (acl_d->next < 0) {
  75                 errno = EINVAL;
  76                 return -1;
  77         }
  78
  79         if (acl_d->next >= acl_d->count) {
  80                 return 0;
  81         }
  82
  83         *entry_p = &acl_d->acl[acl_d->next++];
  84
  85         return 1;
  86 }
  87
  88 int sys_acl_get_tag_type(SMB_ACL_ENTRY_T entry_d, SMB_ACL_TAG_T *type_p)
  89 {
  90         *type_p = entry_d->a_type;
  91
  92         return 0;
  93 }
  94
  95 int sys_acl_get_permset(SMB_ACL_ENTRY_T entry_d, SMB_ACL_PERMSET_T *permset_p)
  96 {
  97         *permset_p = &entry_d->a_perm;
  98
  99         return 0;
 100 }
 101
 102 void *sys_acl_get_qualifier(SMB_ACL_ENTRY_T entry_d)
 103 {
 104         if (entry_d->a_type == SMB_ACL_USER) {
 105                 return &entry_d->info.user.uid;
 106         }
 107
 108         if (entry_d->a_type == SMB_ACL_GROUP) {
 109                 return &entry_d->info.group.gid;
 110         }
 111
 112         errno = EINVAL;
 113         return NULL;
 114 }
 115
 116 int sys_acl_clear_perms(SMB_ACL_PERMSET_T permset_d)
 117 {
 118         *permset_d = 0;
 119
 120         return 0;
 121 }
 122
 123 int sys_acl_add_perm(SMB_ACL_PERMSET_T permset_d, SMB_ACL_PERM_T perm)
 124 {
 125         if (perm != SMB_ACL_READ && perm != SMB_ACL_WRITE
 126             && perm != SMB_ACL_EXECUTE) {
 127                 errno = EINVAL;
 128                 return -1;
 129         }
 130
 131         if (permset_d == NULL) {
 132                 errno = EINVAL;
 133                 return -1;
 134         }
 135
 136         *permset_d |= perm;
 137
 138         return 0;
 139 }
 140
 141 int sys_acl_get_perm(SMB_ACL_PERMSET_T permset_d, SMB_ACL_PERM_T perm)
 142 {
 143         return *permset_d & perm;
 144 }
 145
 146 char *sys_acl_to_text(const struct smb_acl_t *acl_d, ssize_t *len_p)
 147 {
 148         int     i;
 149         int     len, maxlen;
 150         char    *text;
 151
 152         /*
 153          * use an initial estimate of 20 bytes per ACL entry
 154          * when allocating memory for the text representation
 155          * of the ACL
 156          */
 157         len     = 0;
 158         maxlen  = 20 * acl_d->count;
 159         if ((text = (char *)SMB_MALLOC(maxlen)) == NULL) {
 160                 errno = ENOMEM;
 161                 return NULL;
 162         }
 163
 164         for (i = 0; i < acl_d->count; i++) {
 165                 struct smb_acl_entry *ap = &acl_d->acl[i];
 166                 struct group    *gr;
 167                 char            tagbuf[12];
 168                 char            idbuf[12];
 169                 const char      *tag;
 170                 const char      *id     = "";
 171                 char            perms[4];
 172                 int             nbytes;
 173
 174                 switch (ap->a_type) {
 175                         /*
 176                          * for debugging purposes it's probably more
 177                          * useful to dump unknown tag types rather
 178                          * than just returning an error
 179                          */
 180                         default:
 181                                 slprintf(tagbuf, sizeof(tagbuf)-1, "0x%x",
 182                                          ap->a_type);
 183                                 tag = tagbuf;
 184                                 break;
 185
 186                         case SMB_ACL_USER:
 187                                 id = uidtoname(ap->info.user.uid);
 188
 189                                 FALL_THROUGH;
 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
 203                                 FALL_THROUGH;
 204                         case SMB_ACL_GROUP_OBJ:
 205                                 tag = "group";
 206                                 break;
 207
 208                         case SMB_ACL_OTHER:
 209                                 tag = "other";
 210                                 break;
 211
 212                         case SMB_ACL_MASK:
 213                                 tag = "mask";
 214                                 break;
 215
 216                 }
 217
 218                 perms[0] = (ap->a_perm & SMB_ACL_READ) ? 'r' : '-';
 219                 perms[1] = (ap->a_perm & SMB_ACL_WRITE) ? 'w' : '-';
 220                 perms[2] = (ap->a_perm & SMB_ACL_EXECUTE) ? 'x' : '-';
 221                 perms[3] = '\0';
 222
 223                 /*          <tag>      :  <qualifier>   :  rwx \n  \0 */
 224                 nbytes = strlen(tag) + 1 + strlen(id) + 1 + 3 + 1 + 1;
 225
 226                 /*
 227                  * If this entry would overflow the buffer
 228                  * allocate enough additional memory for this
 229                  * entry and an estimate of another 20 bytes
 230                  * for each entry still to be processed
 231                  */
 232                 if ((len + nbytes) > maxlen) {
 233                         maxlen += nbytes + 20 * (acl_d->count - i);
 234                         if ((text = (char *)SMB_REALLOC(text, maxlen)) == NULL) {
 235                                 errno = ENOMEM;
 236                                 return NULL;
 237                         }
 238                 }
 239
 240
 241                 slprintf(&text[len], nbytes, "%s:%s:%s\n", tag, id, perms);
 242                 len += (nbytes - 1);
 243         }
 244
 245         if (len_p)
 246                 *len_p = len;
 247
 248         return text;
 249 }
 250
 251 SMB_ACL_T sys_acl_init(TALLOC_CTX *mem_ctx)
 252 {
 253         SMB_ACL_T       a;
 254
 255         if ((a = talloc(mem_ctx, struct smb_acl_t)) == NULL) {
 256                 errno = ENOMEM;
 257                 return NULL;
 258         }
 259
 260         a->count = 0;
 261         a->next = -1;
 262
 263         a->acl = talloc_array(a, struct smb_acl_entry, 0);
 264         if (!a->acl) {
 265                 TALLOC_FREE(a);
 266                 errno = ENOMEM;
 267                 return NULL;
 268         }
 269
 270         return a;
 271 }
 272
 273 int sys_acl_create_entry(SMB_ACL_T *acl_p, SMB_ACL_ENTRY_T *entry_p)
 274 {
 275         SMB_ACL_T       acl_d;
 276         SMB_ACL_ENTRY_T entry_d;
 277         struct smb_acl_entry *acl;
 278
 279         if (acl_p == NULL || entry_p == NULL || (acl_d = *acl_p) == NULL) {
 280                 errno = EINVAL;
 281                 return -1;
 282         }
 283
 284         acl = talloc_realloc(acl_d, acl_d->acl, struct smb_acl_entry, acl_d->count+1);
 285         if (!acl) {
 286                 errno = ENOMEM;
 287                 return -1;
 288         }
 289         acl_d->acl = acl;
 290         entry_d         = &acl_d->acl[acl_d->count];
 291         entry_d->a_type = SMB_ACL_TAG_INVALID;
 292         entry_d->a_perm = 0;
 293         *entry_p        = entry_d;
 294
 295         acl_d->count++;
 296         return 0;
 297 }
 298
 299 int sys_acl_set_tag_type(SMB_ACL_ENTRY_T entry_d, SMB_ACL_TAG_T tag_type)
 300 {
 301         switch (tag_type) {
 302                 case SMB_ACL_USER:
 303                 case SMB_ACL_USER_OBJ:
 304                 case SMB_ACL_GROUP:
 305                 case SMB_ACL_GROUP_OBJ:
 306                 case SMB_ACL_OTHER:
 307                 case SMB_ACL_MASK:
 308                         entry_d->a_type = tag_type;
 309                         break;
 310                 default:
 311                         errno = EINVAL;
 312                         return -1;
 313                 }
 314
 315         return 0;
 316 }
 317
 318 int sys_acl_set_qualifier(SMB_ACL_ENTRY_T entry_d, void *qual_p)
 319 {
 320         if (entry_d->a_type == SMB_ACL_USER) {
 321                 entry_d->info.user.uid = *((uid_t *)qual_p);
 322                 return 0;
 323         }
 324         if (entry_d->a_type == SMB_ACL_GROUP) {
 325                 entry_d->info.group.gid = *((gid_t *)qual_p);
 326                 return 0;
 327         }
 328
 329         errno = EINVAL;
 330         return -1;
 331 }
 332
 333 int sys_acl_set_permset(SMB_ACL_ENTRY_T entry_d, SMB_ACL_PERMSET_T permset_d)
 334 {
 335         if (*permset_d & ~(SMB_ACL_READ|SMB_ACL_WRITE|SMB_ACL_EXECUTE)) {
 336                 errno = EINVAL;
 337                 return -1;
 338         }
 339
 340         entry_d->a_perm = *permset_d;
 341
 342         return 0;
 343 }
 344
 345 int sys_acl_free_text(char *text)
 346 {
 347         SAFE_FREE(text);
 348         return 0;
 349 }
 350
 351 int sys_acl_valid(SMB_ACL_T acl_d)
 352 {
 353         errno = EINVAL;
 354         return -1;
 355 }
 356
 357 /*
 358  * acl_get_file, acl_get_fd, acl_set_file, acl_set_fd and
 359  * sys_acl_delete_def_fd are to be redirected to the default
 360  * statically-bound acl vfs module, but they are replaceable.
 361  */
 362
 363 #if defined(HAVE_POSIX_ACLS)
 364
 365 SMB_ACL_T sys_acl_get_fd(vfs_handle_struct *handle,
 366                          files_struct *fsp,
 367                          SMB_ACL_TYPE_T type,
 368                          TALLOC_CTX *mem_ctx)
 369 {
 370         return posixacl_sys_acl_get_fd(handle, fsp, type, mem_ctx);
 371 }
 372
 373 int sys_acl_set_fd(vfs_handle_struct *handle,
 374                    files_struct *fsp,
 375                    SMB_ACL_TYPE_T type,
 376                    SMB_ACL_T acl_d)
 377 {
 378         return posixacl_sys_acl_set_fd(handle, fsp, type, acl_d);
 379 }
 380
 381 int sys_acl_delete_def_fd(vfs_handle_struct *handle,
 382                           files_struct *fsp)
 383 {
 384         return posixacl_sys_acl_delete_def_fd(handle, fsp);
 385 }
 386
 387 #elif defined(HAVE_AIX_ACLS)
 388
 389 SMB_ACL_T sys_acl_get_fd(vfs_handle_struct *handle,
 390                          files_struct *fsp,
 391                          SMB_ACL_TYPE_T type,
 392                          TALLOC_CTX *mem_ctx)
 393 {
 394         return aixacl_sys_acl_get_fd(handle, fsp, type, mem_ctx);
 395 }
 396
 397 int sys_acl_set_fd(vfs_handle_struct *handle,
 398                    files_struct *fsp,
 399                    SMB_ACL_TYPE_T type,
 400                    SMB_ACL_T acl_d)
 401 {
 402         return aixacl_sys_acl_set_fd(handle, fsp, type, acl_d);
 403 }
 404
 405 int sys_acl_delete_def_fd(vfs_handle_struct *handle,
 406                           files_struct *fsp)
 407 {
 408         return aixacl_sys_acl_delete_def_fd(handle, fsp);
 409 }
 410 #elif defined(HAVE_SOLARIS_UNIXWARE_ACLS)
 411
 412 SMB_ACL_T sys_acl_get_fd(vfs_handle_struct *handle,
 413                          files_struct *fsp,
 414                          SMB_ACL_TYPE_T type,
 415                          TALLOC_CTX *mem_ctx)
 416 {
 417         return solarisacl_sys_acl_get_fd(handle, fsp, type,
 418                                          mem_ctx);
 419 }
 420
 421 int sys_acl_set_fd(vfs_handle_struct *handle,
 422                    files_struct *fsp,
 423                    SMB_ACL_TYPE_T type,
 424                    SMB_ACL_T acl_d)
 425 {
 426         return solarisacl_sys_acl_set_fd(handle,
 427                                         fsp,
 428                                         type,
 429                                         acl_d);
 430 }
 431
 432 int sys_acl_delete_def_fd(vfs_handle_struct *handle,
 433                           files_struct *fsp)
 434 {
 435         return solarisacl_sys_acl_delete_def_fd(handle, fsp);
 436 }
 437 #elif defined(HAVE_HPUX_ACLS)
 438
 439 SMB_ACL_T sys_acl_get_fd(vfs_handle_struct *handle,
 440                          files_struct *fsp,
 441                          SMB_ACL_TYPE_T type,
 442                          TALLOC_CTX *mem_ctx)
 443 {
 444         return hpuxacl_sys_acl_get_fd(handle, fsp, mem_ctx);
 445 }
 446
 447 int sys_acl_set_fd(vfs_handle_struct *handle,
 448                    files_struct *fsp,
 449                    SMB_ACL_TYPE_T type,
 450                    SMB_ACL_T acl_d)
 451 {
 452         return hpuxacl_sys_acl_set_file(handle, fsp->fsp_name, type, acl_d);
 453 }
 454
 455 int sys_acl_delete_def_fd(vfs_handle_struct *handle,
 456                           files_struct *fsp)
 457 {
 458         return hpuxacl_sys_acl_delete_def_fd(handle, fsp);
 459 }
 460 #else /* No ACLs. */
 461
 462 SMB_ACL_T sys_acl_get_fd(vfs_handle_struct *handle,
 463                          files_struct *fsp,
 464                          SMB_ACL_TYPE_T type,
 465                          TALLOC_CTX *mem_ctx)
 466 {
 467 #ifdef ENOTSUP
 468         errno = ENOTSUP;
 469 #else
 470         errno = ENOSYS;
 471 #endif
 472         return NULL;
 473 }
 474
 475 int sys_acl_set_fd(vfs_handle_struct *handle,
 476                    files_struct *fsp,
 477                    SMB_ACL_TYPE_T type,
 478                    SMB_ACL_T acl_d)
 479 {
 480 #ifdef ENOTSUP
 481         errno = ENOTSUP;
 482 #else
 483         errno = ENOSYS;
 484 #endif
 485         return -1;
 486 }
 487
 488 int sys_acl_delete_def_fd(vfs_handle_struct *handle,
 489                           files_struct *fsp)
 490 {
 491 #ifdef ENOTSUP
 492         errno = ENOTSUP;
 493 #else
 494         errno = ENOSYS;
 495 #endif
 496         return -1;
 497 }
 498 #endif
 499
 500 /************************************************************************
 501  Deliberately outside the ACL defines. Return 1 if this is a "no acls"
 502  errno, 0 if not.
 503 ************************************************************************/
 504
 505 int no_acl_syscall_error(int err)
 506 {
 507 #if defined(ENOSYS)
 508         if (err == ENOSYS) {
 509                 return 1;
 510         }
 511 #endif
 512 #if defined(ENOTSUP)
 513         if (err == ENOTSUP) {
 514                 return 1;
 515         }
 516 #endif
 517         return 0;
 518 }