source/modules/vfs_afsacl.c

   1 /*
   2  * Convert AFS acls to NT acls and vice versa.
   3  *
   4  * Copyright (C) Volker Lendecke, 2003
   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 2 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, write to the Free Software
  18  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19  */
  20
  21 #include "includes.h"
  22
  23 #undef DBGC_CLASS
  24 #define DBGC_CLASS DBGC_VFS
  25
  26 #include <afs/stds.h>
  27 #include <afs/afs.h>
  28 #include <afs/auth.h>
  29 #include <afs/venus.h>
  30 #include <afs/prs_fs.h>
  31
  32 #define MAXSIZE 2048
  33
  34 extern DOM_SID global_sid_World;
  35 extern DOM_SID global_sid_Builtin_Administrators;
  36 extern DOM_SID global_sid_Builtin_Backup_Operators;
  37 extern DOM_SID global_sid_Authenticated_Users;
  38 extern DOM_SID global_sid_NULL;
  39
  40 extern int afs_syscall(int, char *, int, char *, int);
  41
  42 struct afs_ace {
  43         BOOL positive;
  44         char *name;
  45         DOM_SID sid;
  46         enum SID_NAME_USE type;
  47         uint32 rights;
  48         struct afs_ace *next;
  49 };
  50
  51 struct afs_acl {
  52         TALLOC_CTX *ctx;
  53         int type;
  54         int num_aces;
  55         struct afs_ace *acelist;
  56 };
  57
  58 struct afs_iob {
  59         char *in, *out;
  60         uint16 in_size, out_size;
  61 };
  62
  63
  64 static BOOL init_afs_acl(struct afs_acl *acl)
  65 {
  66         ZERO_STRUCT(*acl);
  67         acl->ctx = talloc_init("afs_acl");
  68         if (acl->ctx == NULL) {
  69                 DEBUG(10, ("Could not init afs_acl"));
  70                 return False;
  71         }
  72         return True;
  73 }
  74
  75 static void free_afs_acl(struct afs_acl *acl)
  76 {
  77         if (acl->ctx != NULL)
  78                 talloc_destroy(acl->ctx);
  79         acl->ctx = NULL;
  80         acl->num_aces = 0;
  81         acl->acelist = NULL;
  82 }
  83
  84 static struct afs_ace *clone_afs_ace(TALLOC_CTX *mem_ctx, struct afs_ace *ace)
  85 {
  86         struct afs_ace *result = talloc(mem_ctx, sizeof(struct afs_ace));
  87
  88         if (result == NULL)
  89                 return NULL;
  90
  91         *result = *ace;
  92
  93         result->next = NULL;
  94         result->name = talloc_strdup(mem_ctx, ace->name);
  95
  96         if (result->name == NULL) {
  97                 return NULL;
  98         }
  99
 100         return result;
 101 }
 102
 103
 104 /* Ok, this is sort-of a hack. We assume here that we have winbind users in
 105  * AFS. And yet another copy of parse_domain_user.... */
 106
 107 static BOOL parse_domain_user(const char *domuser, fstring domain,
 108                               fstring user)
 109 {
 110         char *p = strchr(domuser,*lp_winbind_separator());
 111
 112         if (p==NULL) {
 113                 return False;
 114         }
 115
 116         fstrcpy(user, p+1);
 117         fstrcpy(domain, domuser);
 118         domain[PTR_DIFF(p, domuser)] = 0;
 119         strupper_m(domain);
 120
 121         return True;
 122 }
 123
 124 static struct afs_ace *new_afs_ace(TALLOC_CTX *mem_ctx,
 125                                    BOOL positive,
 126                                    const char *name, uint32 rights)
 127 {
 128         DOM_SID sid;
 129         enum SID_NAME_USE type;
 130         struct afs_ace *result;
 131
 132         if (strcmp(name, "system:administrators") == 0) {
 133
 134                 sid_copy(&sid, &global_sid_Builtin_Administrators);
 135                 type = SID_NAME_ALIAS;
 136
 137         } else if (strcmp(name, "system:anyuser") == 0) {
 138
 139                 sid_copy(&sid, &global_sid_World);
 140                 type = SID_NAME_ALIAS;
 141
 142         } else if (strcmp(name, "system:authuser") == 0) {
 143
 144                 sid_copy(&sid, &global_sid_Authenticated_Users);
 145                 type = SID_NAME_WKN_GRP;
 146
 147         } else if (strcmp(name, "system:backup") == 0) {
 148
 149                 sid_copy(&sid, &global_sid_Builtin_Backup_Operators);
 150                 type = SID_NAME_ALIAS;
 151
 152         } else {
 153
 154                 fstring user, domain;
 155
 156                 if (!parse_domain_user(name, domain, user)) {
 157                         fstrcpy(user, name);
 158                         fstrcpy(domain, lp_workgroup());
 159                 }
 160
 161                 if (!lookup_name(domain, user, &sid, &type)) {
 162                         DEBUG(10, ("Could not find AFS user %s\n", name));
 163
 164                         sid_copy(&sid, &global_sid_NULL);
 165                         type = SID_NAME_UNKNOWN;
 166
 167                 }
 168         }
 169
 170         result = talloc(mem_ctx, sizeof(struct afs_ace));
 171
 172         if (result == NULL) {
 173                 DEBUG(0, ("Could not talloc AFS ace\n"));
 174                 return NULL;
 175         }
 176
 177         result->name = talloc_strdup(mem_ctx, name);
 178         if (result->name == NULL) {
 179                 DEBUG(0, ("Could not talloc AFS ace name\n"));
 180                 return NULL;
 181         }
 182
 183         result->sid = sid;
 184         result->type = type;
 185
 186         result->positive = positive;
 187         result->rights = rights;
 188
 189         return result;
 190 }
 191
 192 static void add_afs_ace(struct afs_acl *acl,
 193                         BOOL positive,
 194                         const char *name, uint32 rights)
 195 {
 196         struct afs_ace *ace;
 197
 198         for (ace = acl->acelist; ace != NULL; ace = ace->next) {
 199                 if ((ace->positive == positive) &&
 200                     (strequal(ace->name, name))) {
 201                         ace->rights |= rights;
 202                         return;
 203                 }
 204         }
 205
 206         ace = new_afs_ace(acl->ctx, positive, name, rights);
 207
 208         ace->next = acl->acelist;
 209         acl->acelist = ace;
 210
 211         acl->num_aces += 1;
 212
 213         DEBUG(10, ("add_afs_ace: Added %s entry for %s with rights %d\n",
 214                    ace->positive?"positive":"negative",
 215                    ace->name, ace->rights));
 216
 217         return;
 218 }
 219
 220 /* AFS ACLs in string form are a long string of fields delimited with \n.
 221  *
 222  * First line:  Number of positive entries
 223  * Second line: Number of negative entries
 224  * Third and following lines: The entries themselves
 225  *
 226  * An ACE is a line of two fields, delimited by \t.
 227  *
 228  * First field:  Name
 229  * Second field: Rights
 230  */
 231
 232 static BOOL parse_afs_acl(struct afs_acl *acl, const char *acl_str)
 233 {
 234         int nplus, nminus;
 235         int aces;
 236
 237         char str[MAXSIZE+1];
 238         char *p = str;
 239
 240         strncpy(str, acl_str, MAXSIZE);
 241
 242         if (sscanf(p, "%d", &nplus) != 1)
 243                 return False;
 244
 245         DEBUG(10, ("Found %d positive entries\n", nplus));
 246
 247         if ((p = strchr(p, '\n')) == NULL)
 248                 return False;
 249         p += 1;
 250
 251         if (sscanf(p, "%d", &nminus) != 1)
 252                 return False;
 253
 254         DEBUG(10, ("Found %d negative entries\n", nminus));
 255
 256         if ((p = strchr(p, '\n')) == NULL)
 257                 return False;
 258         p += 1;
 259
 260         for (aces = nplus+nminus; aces > 0; aces--)
 261         {
 262
 263                 const char *name;
 264                 uint32 rights;
 265
 266                 name = p;
 267
 268                 if ((p = strchr(p, '\t')) == NULL)
 269                         return False;
 270                 *p = '\0';
 271                 p += 1;
 272
 273                 if (sscanf(p, "%d", &rights) != 1)
 274                         return False;
 275
 276                 if ((p = strchr(p, '\n')) == NULL)
 277                         return False;
 278                 p += 1;
 279
 280                 add_afs_ace(acl, nplus>0, name, rights);
 281
 282                 nplus -= 1;
 283         }
 284
 285         return True;
 286 }
 287
 288 static BOOL unparse_afs_acl(struct afs_acl *acl, char *acl_str)
 289 {
 290         /* TODO: String length checks!!!! */
 291
 292         int positives = 0;
 293         int negatives = 0;
 294         fstring line;
 295
 296         *acl_str = 0;
 297
 298         struct afs_ace *ace = acl->acelist;
 299
 300         while (ace != NULL) {
 301                 if (ace->positive)
 302                         positives++;
 303                 else
 304                         negatives++;
 305                 ace = ace->next;
 306         }
 307
 308         fstr_sprintf(line, "%d\n", positives);
 309         safe_strcat(acl_str, line, MAXSIZE);
 310
 311         fstr_sprintf(line, "%d\n", negatives);
 312         safe_strcat(acl_str, line, MAXSIZE);
 313
 314         ace = acl->acelist;
 315
 316         while (ace != NULL) {
 317                 fstr_sprintf(line, "%s\t%d\n", ace->name, ace->rights);
 318                 safe_strcat(acl_str, line, MAXSIZE);
 319                 ace = ace->next;
 320         }
 321         return True;
 322 }
 323
 324 static uint32 afs_to_nt_file_rights(uint32 rights)
 325 {
 326         uint32 result = 0;
 327
 328         if (rights & PRSFS_READ)
 329                 result |= FILE_READ_DATA | FILE_READ_EA |
 330                         FILE_EXECUTE | FILE_READ_ATTRIBUTES |
 331                         READ_CONTROL_ACCESS | SYNCHRONIZE_ACCESS;
 332
 333         if (rights & PRSFS_WRITE)
 334                 result |= FILE_WRITE_DATA | FILE_WRITE_ATTRIBUTES |
 335                         FILE_WRITE_EA | FILE_APPEND_DATA;
 336
 337         if (rights & PRSFS_LOCK)
 338                 result |= WRITE_OWNER_ACCESS;
 339
 340         if (rights & PRSFS_DELETE)
 341                 result |= DELETE_ACCESS;
 342
 343         return result;
 344 }
 345
 346 static void afs_to_nt_dir_rights(uint32 afs_rights, uint32 *nt_rights,
 347                                  uint8 *flag)
 348 {
 349         *nt_rights = 0;
 350         *flag = SEC_ACE_FLAG_OBJECT_INHERIT |
 351                 SEC_ACE_FLAG_CONTAINER_INHERIT;
 352
 353         if (afs_rights & PRSFS_INSERT)
 354                 *nt_rights |= FILE_ADD_FILE | FILE_ADD_SUBDIRECTORY;
 355
 356         if (afs_rights & PRSFS_LOOKUP)
 357                 *nt_rights |= FILE_READ_DATA | FILE_READ_EA |
 358                         FILE_EXECUTE | FILE_READ_ATTRIBUTES |
 359                         READ_CONTROL_ACCESS | SYNCHRONIZE_ACCESS;
 360
 361         if (afs_rights & PRSFS_WRITE)
 362                 *nt_rights |= FILE_WRITE_ATTRIBUTES | FILE_WRITE_DATA |
 363                         FILE_APPEND_DATA | FILE_WRITE_EA;
 364
 365         if ((afs_rights & (PRSFS_INSERT|PRSFS_LOOKUP|PRSFS_DELETE)) ==
 366             (PRSFS_INSERT|PRSFS_LOOKUP|PRSFS_DELETE))
 367                 *nt_rights |= FILE_WRITE_ATTRIBUTES | FILE_WRITE_EA |
 368                         GENERIC_WRITE_ACCESS;
 369
 370         if (afs_rights & PRSFS_DELETE)
 371                 *nt_rights |= DELETE_ACCESS;
 372
 373         if (afs_rights & PRSFS_ADMINISTER)
 374                 *nt_rights |= FILE_DELETE_CHILD | WRITE_DAC_ACCESS |
 375                         WRITE_OWNER_ACCESS;
 376
 377         if ( (afs_rights & PRSFS_LOOKUP) ==
 378              (afs_rights & (PRSFS_LOOKUP|PRSFS_READ)) ) {
 379                 /* Only lookup right */
 380                 *flag = SEC_ACE_FLAG_CONTAINER_INHERIT;
 381         }
 382
 383         return;
 384 }
 385
 386 #define AFS_FILE_RIGHTS (PRSFS_READ|PRSFS_WRITE|PRSFS_LOCK)
 387 #define AFS_DIR_RIGHTS  (PRSFS_INSERT|PRSFS_LOOKUP|PRSFS_DELETE|PRSFS_ADMINISTER)
 388
 389 static void split_afs_acl(struct afs_acl *acl,
 390                           struct afs_acl *dir_acl,
 391                           struct afs_acl *file_acl)
 392 {
 393         struct afs_ace *ace;
 394
 395         init_afs_acl(dir_acl);
 396         init_afs_acl(file_acl);
 397
 398         for (ace = acl->acelist; ace != NULL; ace = ace->next) {
 399                 if (ace->rights & AFS_FILE_RIGHTS) {
 400                         add_afs_ace(file_acl, ace->positive, ace->name,
 401                                     ace->rights & AFS_FILE_RIGHTS);
 402                 }
 403
 404                 if (ace->rights & AFS_DIR_RIGHTS) {
 405                         add_afs_ace(dir_acl, ace->positive, ace->name,
 406                                     ace->rights & AFS_DIR_RIGHTS);
 407                 }
 408         }
 409         return;
 410 }
 411
 412 static BOOL same_principal(struct afs_ace *x, struct afs_ace *y)
 413 {
 414         return ( (x->positive == y->positive) &&
 415                  (sid_compare(&x->sid, &y->sid) == 0) );
 416 }
 417
 418 static void merge_afs_acls(struct afs_acl *dir_acl,
 419                            struct afs_acl *file_acl,
 420                            struct afs_acl *target)
 421 {
 422         struct afs_ace *ace;
 423
 424         init_afs_acl(target);
 425
 426         for (ace = dir_acl->acelist; ace != NULL; ace = ace->next) {
 427                 struct afs_ace *file_ace;
 428                 BOOL found = False;
 429
 430                 for (file_ace = file_acl->acelist;
 431                      file_ace != NULL;
 432                      file_ace = file_ace->next) {
 433                         if (!same_principal(ace, file_ace))
 434                                 continue;
 435
 436                         add_afs_ace(target, ace->positive, ace->name,
 437                                     ace->rights | file_ace->rights);
 438                         found = True;
 439                         break;
 440                 }
 441                 if (!found)
 442                         add_afs_ace(target, ace->positive, ace->name,
 443                                     ace->rights);
 444         }
 445
 446         for (ace = file_acl->acelist; ace != NULL; ace = ace->next) {
 447                 struct afs_ace *dir_ace;
 448                 BOOL already_seen = False;
 449
 450                 for (dir_ace = dir_acl->acelist;
 451                      dir_ace != NULL;
 452                      dir_ace = dir_ace->next) {
 453                         if (!same_principal(ace, dir_ace))
 454                                 continue;
 455                         already_seen = True;
 456                         break;
 457                 }
 458                 if (!already_seen)
 459                         add_afs_ace(target, ace->positive, ace->name,
 460                                     ace->rights);
 461         }
 462 }
 463
 464 #define PERMS_READ   0x001200a9
 465 #define PERMS_CHANGE 0x001301bf
 466 #define PERMS_FULL   0x001f01ff
 467
 468 static struct static_dir_ace_mapping {
 469         uint8 type;
 470         uint8 flags;
 471         uint32 mask;
 472         uint32 afs_rights;
 473 } ace_mappings[] = {
 474
 475         /* Full control */
 476         { 0, SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT,
 477           PERMS_FULL, 127 /* rlidwka */ },
 478
 479         /* Change (write) */
 480         { 0, SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT,
 481           PERMS_CHANGE, 63 /* rlidwk */ },
 482
 483         /* Read (including list folder content) */
 484         { 0, SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT,
 485           PERMS_READ, 9 /* rl */ },
 486
 487         /* Read without list folder content -- same as "l" */
 488         { 0, SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT,
 489           0x00120089, 8 /* l */ },
 490
 491         /* List folder */
 492         { 0, SEC_ACE_FLAG_CONTAINER_INHERIT,
 493           PERMS_READ, 8 /* l */ },
 494
 495         /* FULL without inheritance -- in all cases here we also get
 496            the corresponding INHERIT_ONLY ACE in the same ACL */
 497         { 0, 0, PERMS_FULL, 127 /* rlidwka */ },
 498
 499         /* FULL inherit only -- counterpart to previous one */
 500         { 0, SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_INHERIT_ONLY,
 501           PERMS_FULL | GENERIC_RIGHT_WRITE_ACCESS, 127 /* rlidwka */ },
 502
 503         /* CHANGE without inheritance -- in all cases here we also get
 504            the corresponding INHERIT_ONLY ACE in the same ACL */
 505         { 0, 0, PERMS_CHANGE, 63 /* rlidwk */ },
 506
 507         /* CHANGE inherit only -- counterpart to previous one */
 508         { 0, SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_INHERIT_ONLY,
 509           PERMS_CHANGE | GENERIC_RIGHT_WRITE_ACCESS, 63 /* rlidwk */ },
 510
 511         /* End marker, hopefully there's no afs right 9999 :-) */
 512         { 0, 0, 0, 9999 }
 513 };
 514
 515 static uint32 nt_to_afs_dir_rights(const char *filename, const SEC_ACE *ace)
 516 {
 517         uint32 result = 0;
 518         uint32 rights = ace->info.mask;
 519         uint8 flags = ace->flags;
 520
 521         struct static_dir_ace_mapping *m;
 522
 523         for (m = &ace_mappings[0]; m->afs_rights != 9999; m++) {
 524                 if ( (ace->type == m->type) &&
 525                      (ace->flags == m->flags) &&
 526                      (ace->info.mask == m->mask) )
 527                         return m->afs_rights;
 528         }
 529
 530         DEBUG(1, ("AFSACL FALLBACK: 0x%X 0x%X 0x%X %s\n",
 531                   ace->type, ace->flags, ace->info.mask, filename));
 532
 533         if (rights & (GENERIC_ALL_ACCESS|WRITE_DAC_ACCESS)) {
 534                 result |= PRSFS_READ | PRSFS_WRITE | PRSFS_INSERT |
 535                         PRSFS_LOOKUP | PRSFS_DELETE | PRSFS_LOCK |
 536                         PRSFS_ADMINISTER;
 537         }
 538
 539         if (rights & (GENERIC_READ_ACCESS|FILE_READ_DATA)) {
 540                 result |= PRSFS_LOOKUP;
 541                 if (flags & SEC_ACE_FLAG_OBJECT_INHERIT) {
 542                         result |= PRSFS_READ;
 543                 }
 544         }
 545
 546         if (rights & (GENERIC_WRITE_ACCESS|FILE_WRITE_DATA)) {
 547                 result |= PRSFS_INSERT | PRSFS_DELETE;
 548                 if (flags & SEC_ACE_FLAG_OBJECT_INHERIT) {
 549                         result |= PRSFS_WRITE | PRSFS_LOCK;
 550                 }
 551         }
 552
 553         return result;
 554 }
 555
 556 static uint32 nt_to_afs_file_rights(const char *filename, const SEC_ACE *ace)
 557 {
 558         uint32 result = 0;
 559         uint32 rights = ace->info.mask;
 560
 561         if (rights & (GENERIC_READ_ACCESS|FILE_READ_DATA)) {
 562                 result |= PRSFS_READ;
 563         }
 564
 565         if (rights & (GENERIC_WRITE_ACCESS|FILE_WRITE_DATA)) {
 566                 result |= PRSFS_WRITE | PRSFS_LOCK;
 567         }
 568
 569         return result;
 570 }
 571
 572 static size_t afs_to_nt_acl(struct afs_acl *afs_acl,
 573                             struct files_struct *fsp,
 574                             uint32 security_info,
 575                             struct security_descriptor_info **ppdesc)
 576 {
 577         SEC_ACE *nt_ace_list;
 578         DOM_SID owner_sid, group_sid;
 579         SEC_ACCESS mask;
 580         SMB_STRUCT_STAT sbuf;
 581         SEC_ACL *psa = NULL;
 582         int good_aces;
 583         size_t sd_size;
 584         TALLOC_CTX *mem_ctx = main_loop_talloc_get();
 585
 586         struct afs_ace *afs_ace;
 587
 588         if (fsp->is_directory || fsp->fd == -1) {
 589                 /* Get the stat struct for the owner info. */
 590                 if(SMB_VFS_STAT(fsp->conn,fsp->fsp_name, &sbuf) != 0) {
 591                         return 0;
 592                 }
 593         } else {
 594                 if(SMB_VFS_FSTAT(fsp,fsp->fd,&sbuf) != 0) {
 595                         return 0;
 596                 }
 597         }
 598
 599         uid_to_sid(&owner_sid, sbuf.st_uid);
 600         gid_to_sid(&group_sid, sbuf.st_gid);
 601
 602         nt_ace_list = (SEC_ACE *)malloc(afs_acl->num_aces * sizeof(SEC_ACE));
 603
 604         if (nt_ace_list == NULL)
 605                 return 0;
 606
 607         afs_ace = afs_acl->acelist;
 608         good_aces = 0;
 609
 610         while (afs_ace != NULL) {
 611                 uint32 nt_rights;
 612                 uint8 flag = SEC_ACE_FLAG_OBJECT_INHERIT |
 613                         SEC_ACE_FLAG_CONTAINER_INHERIT;
 614
 615                 if (afs_ace->type == SID_NAME_UNKNOWN) {
 616                         DEBUG(10, ("Ignoring unknown name %s\n",
 617                                    afs_ace->name));
 618                         afs_ace = afs_ace->next;
 619                         continue;
 620                 }
 621
 622                 if (fsp->is_directory)
 623                         afs_to_nt_dir_rights(afs_ace->rights, &nt_rights,
 624                                              &flag);
 625                 else
 626                         nt_rights = afs_to_nt_file_rights(afs_ace->rights);
 627
 628                 init_sec_access(&mask, nt_rights);
 629                 init_sec_ace(&nt_ace_list[good_aces++], &(afs_ace->sid),
 630                              SEC_ACE_TYPE_ACCESS_ALLOWED, mask, flag);
 631                 afs_ace = afs_ace->next;
 632         }
 633
 634         psa = make_sec_acl(mem_ctx, NT4_ACL_REVISION,
 635                            good_aces, nt_ace_list);
 636         if (psa == NULL)
 637                 return 0;
 638
 639
 640         *ppdesc = make_sec_desc(mem_ctx, SEC_DESC_REVISION,
 641                                 SEC_DESC_SELF_RELATIVE,
 642                                 (security_info & OWNER_SECURITY_INFORMATION)
 643                                 ? &owner_sid : NULL,
 644                                 (security_info & GROUP_SECURITY_INFORMATION)
 645                                 ? &group_sid : NULL,
 646                                 NULL, psa, &sd_size);
 647
 648         return sd_size;
 649 }
 650
 651 static BOOL mappable_sid(const DOM_SID *sid)
 652 {
 653         DOM_SID domain_sid;
 654
 655         if (sid_compare(sid, &global_sid_Builtin_Administrators) == 0)
 656                 return True;
 657
 658         if (sid_compare(sid, &global_sid_World) == 0)
 659                 return True;
 660
 661         if (sid_compare(sid, &global_sid_Authenticated_Users) == 0)
 662                 return True;
 663
 664         if (sid_compare(sid, &global_sid_Builtin_Backup_Operators) == 0)
 665                 return True;
 666
 667         string_to_sid(&domain_sid, "S-1-5-21");
 668
 669         if (sid_compare_domain(sid, &domain_sid) == 0)
 670                 return True;
 671
 672         return False;
 673 }
 674
 675 static BOOL nt_to_afs_acl(const char *filename,
 676                           uint32 security_info_sent,
 677                           struct security_descriptor_info *psd,
 678                           uint32 (*nt_to_afs_rights)(const char *filename,
 679                                                      const SEC_ACE *ace),
 680                           struct afs_acl *afs_acl)
 681 {
 682         SEC_ACL *dacl;
 683         int i;
 684
 685         /* Currently we *only* look at the dacl */
 686
 687         if (((security_info_sent & DACL_SECURITY_INFORMATION) == 0) ||
 688             (psd->dacl == NULL))
 689                 return True;
 690
 691         if (!init_afs_acl(afs_acl))
 692                 return False;
 693
 694         dacl = psd->dacl;
 695
 696         for (i = 0; i < dacl->num_aces; i++) {
 697                 SEC_ACE *ace = &(dacl->ace[i]);
 698                 fstring dom_name;
 699                 fstring name;
 700                 enum SID_NAME_USE name_type;
 701
 702                 if (ace->type != SEC_ACE_TYPE_ACCESS_ALLOWED) {
 703                         /* First cut: Only positive ACEs */
 704                         return False;
 705                 }
 706
 707                 if (!mappable_sid(&ace->trustee)) {
 708                         DEBUG(10, ("Ignoring unmappable SID %s\n",
 709                                    sid_string_static(&ace->trustee)));
 710                         continue;
 711                 }
 712
 713                 if (sid_compare(&ace->trustee,
 714                                 &global_sid_Builtin_Administrators) == 0) {
 715
 716                         fstrcpy(name, "system:administrators");
 717
 718                 } else if (sid_compare(&ace->trustee,
 719                                        &global_sid_World) == 0) {
 720
 721                         fstrcpy(name, "system:anyuser");
 722
 723                 } else if (sid_compare(&ace->trustee,
 724                                        &global_sid_Authenticated_Users) == 0) {
 725
 726                         fstrcpy(name, "system:authuser");
 727
 728                 } else if (sid_compare(&ace->trustee,
 729                                        &global_sid_Builtin_Backup_Operators)
 730                            == 0) {
 731
 732                         fstrcpy(name, "system:backup");
 733
 734                 } else {
 735
 736                         if (!lookup_sid(&ace->trustee,
 737                                         dom_name, name, &name_type)) {
 738                                 DEBUG(1, ("AFSACL: Could not lookup SID %s on file %s\n",
 739                                           sid_string_static(&ace->trustee), filename));
 740                                 continue;
 741                         }
 742
 743                         if ( (name_type == SID_NAME_USER) ||
 744                              (name_type == SID_NAME_DOM_GRP) ||
 745                              (name_type == SID_NAME_ALIAS) ) {
 746                                 fstring only_username;
 747                                 fstrcpy(only_username, name);
 748                                 fstr_sprintf(name, "%s%s%s",
 749                                              dom_name, lp_winbind_separator(),
 750                                              only_username);
 751                                 strlower_m(name);
 752                         }
 753                 }
 754
 755                 add_afs_ace(afs_acl, True, name,
 756                             nt_to_afs_rights(filename, ace));
 757         }
 758
 759         return True;
 760 }
 761
 762 static BOOL afs_get_afs_acl(char *filename, struct afs_acl *acl)
 763 {
 764         struct afs_iob iob;
 765
 766         int ret;
 767
 768         char space[MAXSIZE];
 769
 770         DEBUG(5, ("afs_get_afs_acl: %s\n", filename));
 771
 772         iob.in_size = 0;
 773         iob.out_size = MAXSIZE;
 774         iob.in = iob.out = space;
 775
 776         ret = afs_syscall(AFSCALL_PIOCTL, filename, VIOCGETAL,
 777                           (char *)&iob, 0);
 778
 779         if (ret) {
 780                 DEBUG(1, ("got error from PIOCTL: %d\n", ret));
 781                 return False;
 782         }
 783
 784         if (!init_afs_acl(acl))
 785                 return False;
 786
 787         if (!parse_afs_acl(acl, space)) {
 788                 DEBUG(1, ("Could not parse AFS acl\n"));
 789                 free_afs_acl(acl);
 790                 return False;
 791         }
 792
 793         return True;
 794 }
 795
 796 static size_t afs_get_nt_acl(struct files_struct *fsp, uint32 security_info,
 797                              struct security_descriptor_info **ppdesc)
 798 {
 799         struct afs_acl acl;
 800         size_t sd_size;
 801
 802         DEBUG(5, ("afs_get_nt_acl: %s\n", fsp->fsp_name));
 803
 804         if (!afs_get_afs_acl(fsp->fsp_name, &acl)) {
 805                 return 0;
 806         }
 807
 808         sd_size = afs_to_nt_acl(&acl, fsp, security_info, ppdesc);
 809
 810         free_afs_acl(&acl);
 811
 812         return sd_size;
 813 }
 814
 815 /* For setting an AFS ACL we have to take care of the ACEs we could
 816  * not properly map to SIDs. Merge all of them into the new ACL. */
 817
 818 static void merge_unknown_aces(struct afs_acl *src, struct afs_acl *dst)
 819 {
 820         struct afs_ace *ace;
 821
 822         for (ace = src->acelist; ace != NULL; ace = ace->next)
 823         {
 824                 struct afs_ace *copy;
 825
 826                 if (ace->type != SID_NAME_UNKNOWN) {
 827                         DEBUG(10, ("Not merging known ACE for %s\n",
 828                                    ace->name));
 829                         continue;
 830                 }
 831
 832                 DEBUG(10, ("Merging unknown ACE for %s\n", ace->name));
 833
 834                 copy = clone_afs_ace(dst->ctx, ace);
 835
 836                 if (copy == NULL) {
 837                         DEBUG(0, ("Could not clone ACE for %s\n", ace->name));
 838                         continue;
 839                 }
 840
 841                 copy->next = dst->acelist;
 842                 dst->acelist = copy;
 843                 dst->num_aces += 1;
 844         }
 845 }
 846
 847 static BOOL afs_set_nt_acl(vfs_handle_struct *handle, files_struct *fsp,
 848                            uint32 security_info_sent,
 849                            struct security_descriptor_info *psd)
 850 {
 851         struct afs_acl old_afs_acl, new_afs_acl;
 852         struct afs_acl dir_acl, file_acl;
 853         char acl_string[2049];
 854         struct afs_iob iob;
 855         int ret = -1;
 856         pstring name;
 857         const char *fileacls;
 858
 859         fileacls = lp_parm_const_string(SNUM(handle->conn), "afsacl", "fileacls",
 860                                         "yes");
 861
 862         ZERO_STRUCT(old_afs_acl);
 863         ZERO_STRUCT(new_afs_acl);
 864         ZERO_STRUCT(dir_acl);
 865         ZERO_STRUCT(file_acl);
 866
 867         pstr_sprintf(name, fsp->fsp_name);
 868
 869         if (!fsp->is_directory) {
 870                 char *p = strrchr(name, '/');
 871                 if (p == NULL) {
 872                         DEBUG(3, ("No / in file string\n"));
 873                         return False;
 874                 }
 875                 *p = '\0';
 876         }
 877
 878         if (!afs_get_afs_acl(name, &old_afs_acl)) {
 879                 DEBUG(3, ("Could not get old ACL of %s\n", fsp->fsp_name));
 880                 goto done;
 881         }
 882
 883         split_afs_acl(&old_afs_acl, &dir_acl, &file_acl);
 884
 885         if (fsp->is_directory) {
 886
 887                 if (!strequal(fileacls, "yes")) {
 888                         /* Throw away file acls, we depend on the
 889                          * inheritance ACEs that also give us file
 890                          * permissions */
 891                         free_afs_acl(&file_acl);
 892                 }
 893
 894                 free_afs_acl(&dir_acl);
 895                 if (!nt_to_afs_acl(fsp->fsp_name, security_info_sent, psd,
 896                                    nt_to_afs_dir_rights, &dir_acl))
 897                         goto done;
 898         } else {
 899                 if (strequal(fileacls, "no")) {
 900                         ret = -1;
 901                         goto done;
 902                 }
 903
 904                 if (strequal(fileacls, "ignore")) {
 905                         ret = 0;
 906                         goto done;
 907                 }
 908
 909                 free_afs_acl(&file_acl);
 910                 if (!nt_to_afs_acl(fsp->fsp_name, security_info_sent, psd,
 911                                    nt_to_afs_file_rights, &file_acl))
 912                         goto done;
 913         }
 914
 915         merge_afs_acls(&dir_acl, &file_acl, &new_afs_acl);
 916
 917         merge_unknown_aces(&old_afs_acl, &new_afs_acl);
 918
 919         unparse_afs_acl(&new_afs_acl, acl_string);
 920
 921         iob.in = acl_string;
 922         iob.in_size = 1+strlen(iob.in);
 923         iob.out = NULL;
 924         iob.out_size = 0;
 925
 926         DEBUG(10, ("trying to set acl '%s' on file %s\n", iob.in, name));
 927
 928         ret = afs_syscall(AFSCALL_PIOCTL, name, VIOCSETAL, (char *)&iob, 0);
 929
 930         if (ret != 0) {
 931                 DEBUG(10, ("VIOCSETAL returned %d\n", ret));
 932         }
 933
 934  done:
 935         free_afs_acl(&dir_acl);
 936         free_afs_acl(&file_acl);
 937         free_afs_acl(&old_afs_acl);
 938         free_afs_acl(&new_afs_acl);
 939
 940         return (ret == 0);
 941 }
 942
 943 static size_t afsacl_fget_nt_acl(struct vfs_handle_struct *handle,
 944                                  struct files_struct *fsp,
 945                                  int fd,  uint32 security_info,
 946                                  struct security_descriptor_info **ppdesc)
 947 {
 948         return afs_get_nt_acl(fsp, security_info, ppdesc);
 949 }
 950 static size_t afsacl_get_nt_acl(struct vfs_handle_struct *handle,
 951                                 struct files_struct *fsp,
 952                                 const char *name,  uint32 security_info,
 953                                 struct security_descriptor_info **ppdesc)
 954 {
 955         return afs_get_nt_acl(fsp, security_info, ppdesc);
 956 }
 957
 958 BOOL afsacl_fset_nt_acl(vfs_handle_struct *handle,
 959                          files_struct *fsp,
 960                          int fd, uint32 security_info_sent,
 961                          SEC_DESC *psd)
 962 {
 963         return afs_set_nt_acl(handle, fsp, security_info_sent, psd);
 964 }
 965
 966 BOOL afsacl_set_nt_acl(vfs_handle_struct *handle,
 967                        files_struct *fsp,
 968                        const char *name, uint32 security_info_sent,
 969                        SEC_DESC *psd)
 970 {
 971         return afs_set_nt_acl(handle, fsp, security_info_sent, psd);
 972 }
 973
 974 /* VFS operations structure */
 975
 976 static vfs_op_tuple afsacl_ops[] = {
 977         {SMB_VFS_OP(afsacl_fget_nt_acl), SMB_VFS_OP_FGET_NT_ACL,
 978          SMB_VFS_LAYER_TRANSPARENT},
 979         {SMB_VFS_OP(afsacl_get_nt_acl), SMB_VFS_OP_GET_NT_ACL,
 980          SMB_VFS_LAYER_TRANSPARENT},
 981         {SMB_VFS_OP(afsacl_fset_nt_acl), SMB_VFS_OP_FSET_NT_ACL,
 982          SMB_VFS_LAYER_TRANSPARENT},
 983         {SMB_VFS_OP(afsacl_set_nt_acl), SMB_VFS_OP_SET_NT_ACL,
 984          SMB_VFS_LAYER_TRANSPARENT},
 985         {SMB_VFS_OP(NULL), SMB_VFS_OP_NOOP, SMB_VFS_LAYER_NOOP}
 986 };
 987
 988 NTSTATUS vfs_afsacl_init(void)
 989 {
 990         return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "afsacl",
 991                                 afsacl_ops);
 992 }