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 static char space_replacement = '%';
  41
  42 extern int afs_syscall(int, char *, int, char *, int);
  43
  44 struct afs_ace {
  45         BOOL positive;
  46         char *name;
  47         DOM_SID sid;
  48         enum SID_NAME_USE type;
  49         uint32 rights;
  50         struct afs_ace *next;
  51 };
  52
  53 struct afs_acl {
  54         TALLOC_CTX *ctx;
  55         int type;
  56         int num_aces;
  57         struct afs_ace *acelist;
  58 };
  59
  60 struct afs_iob {
  61         char *in, *out;
  62         uint16 in_size, out_size;
  63 };
  64
  65
  66 static BOOL init_afs_acl(struct afs_acl *acl)
  67 {
  68         ZERO_STRUCT(*acl);
  69         acl->ctx = talloc_init("afs_acl");
  70         if (acl->ctx == NULL) {
  71                 DEBUG(10, ("Could not init afs_acl"));
  72                 return False;
  73         }
  74         return True;
  75 }
  76
  77 static void free_afs_acl(struct afs_acl *acl)
  78 {
  79         if (acl->ctx != NULL)
  80                 talloc_destroy(acl->ctx);
  81         acl->ctx = NULL;
  82         acl->num_aces = 0;
  83         acl->acelist = NULL;
  84 }
  85
  86 static struct afs_ace *clone_afs_ace(TALLOC_CTX *mem_ctx, struct afs_ace *ace)
  87 {
  88         struct afs_ace *result = TALLOC_P(mem_ctx, struct afs_ace);
  89
  90         if (result == NULL)
  91                 return NULL;
  92
  93         *result = *ace;
  94
  95         result->next = NULL;
  96         result->name = talloc_strdup(mem_ctx, ace->name);
  97
  98         if (result->name == NULL) {
  99                 return NULL;
 100         }
 101
 102         return result;
 103 }
 104
 105
 106 /* Ok, this is sort-of a hack. We assume here that we have winbind users in
 107  * AFS. And yet another copy of parse_domain_user.... */
 108
 109 static BOOL parse_domain_user(const char *domuser, fstring domain,
 110                               fstring user)
 111 {
 112         char *p = strchr(domuser,*lp_winbind_separator());
 113
 114         if (p==NULL) {
 115                 return False;
 116         }
 117
 118         fstrcpy(user, p+1);
 119         fstrcpy(domain, domuser);
 120         domain[PTR_DIFF(p, domuser)] = 0;
 121         strupper_m(domain);
 122
 123         return True;
 124 }
 125
 126 static struct afs_ace *new_afs_ace(TALLOC_CTX *mem_ctx,
 127                                    BOOL positive,
 128                                    const char *name, uint32 rights)
 129 {
 130         DOM_SID sid;
 131         enum SID_NAME_USE type;
 132         struct afs_ace *result;
 133
 134         if (strcmp(name, "system:administrators") == 0) {
 135
 136                 sid_copy(&sid, &global_sid_Builtin_Administrators);
 137                 type = SID_NAME_ALIAS;
 138
 139         } else if (strcmp(name, "system:anyuser") == 0) {
 140
 141                 sid_copy(&sid, &global_sid_World);
 142                 type = SID_NAME_ALIAS;
 143
 144         } else if (strcmp(name, "system:authuser") == 0) {
 145
 146                 sid_copy(&sid, &global_sid_Authenticated_Users);
 147                 type = SID_NAME_WKN_GRP;
 148
 149         } else if (strcmp(name, "system:backup") == 0) {
 150
 151                 sid_copy(&sid, &global_sid_Builtin_Backup_Operators);
 152                 type = SID_NAME_ALIAS;
 153
 154         } else {
 155
 156                 fstring user, domain;
 157
 158                 if (!parse_domain_user(name, domain, user)) {
 159                         fstrcpy(user, name);
 160                         fstrcpy(domain, lp_workgroup());
 161                 }
 162
 163                 if (!lookup_name(domain, user, &sid, &type)) {
 164                         DEBUG(10, ("Could not find AFS user %s\n", name));
 165
 166                         sid_copy(&sid, &global_sid_NULL);
 167                         type = SID_NAME_UNKNOWN;
 168
 169                 }
 170         }
 171
 172         result = TALLOC_P(mem_ctx, struct afs_ace);
 173
 174         if (result == NULL) {
 175                 DEBUG(0, ("Could not talloc AFS ace\n"));
 176                 return NULL;
 177         }
 178
 179         result->name = talloc_strdup(mem_ctx, name);
 180         if (result->name == NULL) {
 181                 DEBUG(0, ("Could not talloc AFS ace name\n"));
 182                 return NULL;
 183         }
 184
 185         result->sid = sid;
 186         result->type = type;
 187
 188         result->positive = positive;
 189         result->rights = rights;
 190
 191         return result;
 192 }
 193
 194 static void add_afs_ace(struct afs_acl *acl,
 195                         BOOL positive,
 196                         const char *name, uint32 rights)
 197 {
 198         struct afs_ace *ace;
 199
 200         for (ace = acl->acelist; ace != NULL; ace = ace->next) {
 201                 if ((ace->positive == positive) &&
 202                     (strequal(ace->name, name))) {
 203                         ace->rights |= rights;
 204                         return;
 205                 }
 206         }
 207
 208         ace = new_afs_ace(acl->ctx, positive, name, rights);
 209
 210         ace->next = acl->acelist;
 211         acl->acelist = ace;
 212
 213         acl->num_aces += 1;
 214
 215         DEBUG(10, ("add_afs_ace: Added %s entry for %s with rights %d\n",
 216                    ace->positive?"positive":"negative",
 217                    ace->name, ace->rights));
 218
 219         return;
 220 }
 221
 222 /* AFS ACLs in string form are a long string of fields delimited with \n.
 223  *
 224  * First line:  Number of positive entries
 225  * Second line: Number of negative entries
 226  * Third and following lines: The entries themselves
 227  *
 228  * An ACE is a line of two fields, delimited by \t.
 229  *
 230  * First field:  Name
 231  * Second field: Rights
 232  */
 233
 234 static BOOL parse_afs_acl(struct afs_acl *acl, const char *acl_str)
 235 {
 236         int nplus, nminus;
 237         int aces;
 238
 239         char str[MAXSIZE+1];
 240         char *p = str;
 241
 242         strncpy(str, acl_str, MAXSIZE);
 243
 244         if (sscanf(p, "%d", &nplus) != 1)
 245                 return False;
 246
 247         DEBUG(10, ("Found %d positive entries\n", nplus));
 248
 249         if ((p = strchr(p, '\n')) == NULL)
 250                 return False;
 251         p += 1;
 252
 253         if (sscanf(p, "%d", &nminus) != 1)
 254                 return False;
 255
 256         DEBUG(10, ("Found %d negative entries\n", nminus));
 257
 258         if ((p = strchr(p, '\n')) == NULL)
 259                 return False;
 260         p += 1;
 261
 262         for (aces = nplus+nminus; aces > 0; aces--)
 263         {
 264
 265                 const char *namep;
 266                 fstring name;
 267                 uint32 rights;
 268                 char *space;
 269
 270                 namep = p;
 271
 272                 if ((p = strchr(p, '\t')) == NULL)
 273                         return False;
 274                 *p = '\0';
 275                 p += 1;
 276
 277                 if (sscanf(p, "%d", &rights) != 1)
 278                         return False;
 279
 280                 if ((p = strchr(p, '\n')) == NULL)
 281                         return False;
 282                 p += 1;
 283
 284                 fstrcpy(name, namep);
 285
 286                 while ((space = strchr_m(name, space_replacement)) != NULL)
 287                         *space = ' ';
 288
 289                 add_afs_ace(acl, nplus>0, name, rights);
 290
 291                 nplus -= 1;
 292         }
 293
 294         return True;
 295 }
 296
 297 static BOOL unparse_afs_acl(struct afs_acl *acl, char *acl_str)
 298 {
 299         /* TODO: String length checks!!!! */
 300
 301         int positives = 0;
 302         int negatives = 0;
 303         fstring line;
 304
 305         *acl_str = 0;
 306
 307         struct afs_ace *ace = acl->acelist;
 308
 309         while (ace != NULL) {
 310                 if (ace->positive)
 311                         positives++;
 312                 else
 313                         negatives++;
 314                 ace = ace->next;
 315         }
 316
 317         fstr_sprintf(line, "%d\n", positives);
 318         safe_strcat(acl_str, line, MAXSIZE);
 319
 320         fstr_sprintf(line, "%d\n", negatives);
 321         safe_strcat(acl_str, line, MAXSIZE);
 322
 323         ace = acl->acelist;
 324
 325         while (ace != NULL) {
 326                 fstr_sprintf(line, "%s\t%d\n", ace->name, ace->rights);
 327                 safe_strcat(acl_str, line, MAXSIZE);
 328                 ace = ace->next;
 329         }
 330         return True;
 331 }
 332
 333 static uint32 afs_to_nt_file_rights(uint32 rights)
 334 {
 335         uint32 result = 0;
 336
 337         if (rights & PRSFS_READ)
 338                 result |= FILE_READ_DATA | FILE_READ_EA |
 339                         FILE_EXECUTE | FILE_READ_ATTRIBUTES |
 340                         READ_CONTROL_ACCESS | SYNCHRONIZE_ACCESS;
 341
 342         if (rights & PRSFS_WRITE)
 343                 result |= FILE_WRITE_DATA | FILE_WRITE_ATTRIBUTES |
 344                         FILE_WRITE_EA | FILE_APPEND_DATA;
 345
 346         if (rights & PRSFS_LOCK)
 347                 result |= WRITE_OWNER_ACCESS;
 348
 349         if (rights & PRSFS_DELETE)
 350                 result |= DELETE_ACCESS;
 351
 352         return result;
 353 }
 354
 355 static void afs_to_nt_dir_rights(uint32 afs_rights, uint32 *nt_rights,
 356                                  uint8 *flag)
 357 {
 358         *nt_rights = 0;
 359         *flag = SEC_ACE_FLAG_OBJECT_INHERIT |
 360                 SEC_ACE_FLAG_CONTAINER_INHERIT;
 361
 362         if (afs_rights & PRSFS_INSERT)
 363                 *nt_rights |= FILE_ADD_FILE | FILE_ADD_SUBDIRECTORY;
 364
 365         if (afs_rights & PRSFS_LOOKUP)
 366                 *nt_rights |= FILE_READ_DATA | FILE_READ_EA |
 367                         FILE_EXECUTE | FILE_READ_ATTRIBUTES |
 368                         READ_CONTROL_ACCESS | SYNCHRONIZE_ACCESS;
 369
 370         if (afs_rights & PRSFS_WRITE)
 371                 *nt_rights |= FILE_WRITE_ATTRIBUTES | FILE_WRITE_DATA |
 372                         FILE_APPEND_DATA | FILE_WRITE_EA;
 373
 374         if ((afs_rights & (PRSFS_INSERT|PRSFS_LOOKUP|PRSFS_DELETE)) ==
 375             (PRSFS_INSERT|PRSFS_LOOKUP|PRSFS_DELETE))
 376                 *nt_rights |= FILE_WRITE_ATTRIBUTES | FILE_WRITE_EA |
 377                         GENERIC_WRITE_ACCESS;
 378
 379         if (afs_rights & PRSFS_DELETE)
 380                 *nt_rights |= DELETE_ACCESS;
 381
 382         if (afs_rights & PRSFS_ADMINISTER)
 383                 *nt_rights |= FILE_DELETE_CHILD | WRITE_DAC_ACCESS |
 384                         WRITE_OWNER_ACCESS;
 385
 386         if ( (afs_rights & PRSFS_LOOKUP) ==
 387              (afs_rights & (PRSFS_LOOKUP|PRSFS_READ)) ) {
 388                 /* Only lookup right */
 389                 *flag = SEC_ACE_FLAG_CONTAINER_INHERIT;
 390         }
 391
 392         return;
 393 }
 394
 395 #define AFS_FILE_RIGHTS (PRSFS_READ|PRSFS_WRITE|PRSFS_LOCK)
 396 #define AFS_DIR_RIGHTS  (PRSFS_INSERT|PRSFS_LOOKUP|PRSFS_DELETE|PRSFS_ADMINISTER)
 397
 398 static void split_afs_acl(struct afs_acl *acl,
 399                           struct afs_acl *dir_acl,
 400                           struct afs_acl *file_acl)
 401 {
 402         struct afs_ace *ace;
 403
 404         init_afs_acl(dir_acl);
 405         init_afs_acl(file_acl);
 406
 407         for (ace = acl->acelist; ace != NULL; ace = ace->next) {
 408                 if (ace->rights & AFS_FILE_RIGHTS) {
 409                         add_afs_ace(file_acl, ace->positive, ace->name,
 410                                     ace->rights & AFS_FILE_RIGHTS);
 411                 }
 412
 413                 if (ace->rights & AFS_DIR_RIGHTS) {
 414                         add_afs_ace(dir_acl, ace->positive, ace->name,
 415                                     ace->rights & AFS_DIR_RIGHTS);
 416                 }
 417         }
 418         return;
 419 }
 420
 421 static BOOL same_principal(struct afs_ace *x, struct afs_ace *y)
 422 {
 423         return ( (x->positive == y->positive) &&
 424                  (sid_compare(&x->sid, &y->sid) == 0) );
 425 }
 426
 427 static void merge_afs_acls(struct afs_acl *dir_acl,
 428                            struct afs_acl *file_acl,
 429                            struct afs_acl *target)
 430 {
 431         struct afs_ace *ace;
 432
 433         init_afs_acl(target);
 434
 435         for (ace = dir_acl->acelist; ace != NULL; ace = ace->next) {
 436                 struct afs_ace *file_ace;
 437                 BOOL found = False;
 438
 439                 for (file_ace = file_acl->acelist;
 440                      file_ace != NULL;
 441                      file_ace = file_ace->next) {
 442                         if (!same_principal(ace, file_ace))
 443                                 continue;
 444
 445                         add_afs_ace(target, ace->positive, ace->name,
 446                                     ace->rights | file_ace->rights);
 447                         found = True;
 448                         break;
 449                 }
 450                 if (!found)
 451                         add_afs_ace(target, ace->positive, ace->name,
 452                                     ace->rights);
 453         }
 454
 455         for (ace = file_acl->acelist; ace != NULL; ace = ace->next) {
 456                 struct afs_ace *dir_ace;
 457                 BOOL already_seen = False;
 458
 459                 for (dir_ace = dir_acl->acelist;
 460                      dir_ace != NULL;
 461                      dir_ace = dir_ace->next) {
 462                         if (!same_principal(ace, dir_ace))
 463                                 continue;
 464                         already_seen = True;
 465                         break;
 466                 }
 467                 if (!already_seen)
 468                         add_afs_ace(target, ace->positive, ace->name,
 469                                     ace->rights);
 470         }
 471 }
 472
 473 #define PERMS_READ   0x001200a9
 474 #define PERMS_CHANGE 0x001301bf
 475 #define PERMS_FULL   0x001f01ff
 476
 477 static struct static_dir_ace_mapping {
 478         uint8 type;
 479         uint8 flags;
 480         uint32 mask;
 481         uint32 afs_rights;
 482 } ace_mappings[] = {
 483
 484         /* Full control */
 485         { 0, SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT,
 486           PERMS_FULL, 127 /* rlidwka */ },
 487
 488         /* Change (write) */
 489         { 0, SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT,
 490           PERMS_CHANGE, 63 /* rlidwk */ },
 491
 492         /* Read (including list folder content) */
 493         { 0, SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT,
 494           PERMS_READ, 9 /* rl */ },
 495
 496         /* Read without list folder content -- same as "l" */
 497         { 0, SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT,
 498           0x00120089, 8 /* l */ },
 499
 500         /* some stupid workaround for preventing fallbacks */
 501         { 0, 0x3, 0x0012019F, 9 /* rl */ },
 502         { 0, 0x13, PERMS_FULL, 127 /* full */ },
 503
 504         /* read, delete and execute access plus synchronize */
 505         { 0, 0x3, 0x001300A9, 9 /* should be rdl, set to rl */},
 506         /* classical read list */
 507         { 0, 0x13, 0x001200A9, 9 /* rl */},
 508         /* almost full control, no delete */
 509         { 0, 0x13, PERMS_CHANGE, 63 /* rwidlk */},
 510
 511         /* List folder */
 512         { 0, SEC_ACE_FLAG_CONTAINER_INHERIT,
 513           PERMS_READ, 8 /* l */ },
 514
 515         /* FULL without inheritance -- in all cases here we also get
 516            the corresponding INHERIT_ONLY ACE in the same ACL */
 517         { 0, 0, PERMS_FULL, 127 /* rlidwka */ },
 518
 519         /* FULL inherit only -- counterpart to previous one */
 520         { 0, SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_INHERIT_ONLY,
 521           PERMS_FULL | GENERIC_RIGHT_WRITE_ACCESS, 127 /* rlidwka */ },
 522
 523         /* CHANGE without inheritance -- in all cases here we also get
 524            the corresponding INHERIT_ONLY ACE in the same ACL */
 525         { 0, 0, PERMS_CHANGE, 63 /* rlidwk */ },
 526
 527         /* CHANGE inherit only -- counterpart to previous one */
 528         { 0, SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_INHERIT_ONLY,
 529           PERMS_CHANGE | GENERIC_RIGHT_WRITE_ACCESS, 63 /* rlidwk */ },
 530
 531         /* End marker, hopefully there's no afs right 9999 :-) */
 532         { 0, 0, 0, 9999 }
 533 };
 534
 535 static uint32 nt_to_afs_dir_rights(const char *filename, const SEC_ACE *ace)
 536 {
 537         uint32 result = 0;
 538         uint32 rights = ace->info.mask;
 539         uint8 flags = ace->flags;
 540
 541         struct static_dir_ace_mapping *m;
 542
 543         for (m = &ace_mappings[0]; m->afs_rights != 9999; m++) {
 544                 if ( (ace->type == m->type) &&
 545                      (ace->flags == m->flags) &&
 546                      (ace->info.mask == m->mask) )
 547                         return m->afs_rights;
 548         }
 549
 550         DEBUG(1, ("AFSACL FALLBACK: 0x%X 0x%X 0x%X %s %X\n",
 551                   ace->type, ace->flags, ace->info.mask, filename, rights));
 552
 553         if (rights & (GENERIC_ALL_ACCESS|WRITE_DAC_ACCESS)) {
 554                 result |= PRSFS_READ | PRSFS_WRITE | PRSFS_INSERT |
 555                         PRSFS_LOOKUP | PRSFS_DELETE | PRSFS_LOCK |
 556                         PRSFS_ADMINISTER;
 557         }
 558
 559         if (rights & (GENERIC_READ_ACCESS|FILE_READ_DATA)) {
 560                 result |= PRSFS_LOOKUP;
 561                 if (flags & SEC_ACE_FLAG_OBJECT_INHERIT) {
 562                         result |= PRSFS_READ;
 563                 }
 564         }
 565
 566         if (rights & (GENERIC_WRITE_ACCESS|FILE_WRITE_DATA)) {
 567                 result |= PRSFS_INSERT | PRSFS_DELETE;
 568                 if (flags & SEC_ACE_FLAG_OBJECT_INHERIT) {
 569                         result |= PRSFS_WRITE | PRSFS_LOCK;
 570                 }
 571         }
 572
 573         return result;
 574 }
 575
 576 static uint32 nt_to_afs_file_rights(const char *filename, const SEC_ACE *ace)
 577 {
 578         uint32 result = 0;
 579         uint32 rights = ace->info.mask;
 580
 581         if (rights & (GENERIC_READ_ACCESS|FILE_READ_DATA)) {
 582                 result |= PRSFS_READ;
 583         }
 584
 585         if (rights & (GENERIC_WRITE_ACCESS|FILE_WRITE_DATA)) {
 586                 result |= PRSFS_WRITE | PRSFS_LOCK;
 587         }
 588
 589         return result;
 590 }
 591
 592 static size_t afs_to_nt_acl(struct afs_acl *afs_acl,
 593                             struct files_struct *fsp,
 594                             uint32 security_info,
 595                             struct security_descriptor_info **ppdesc)
 596 {
 597         SEC_ACE *nt_ace_list;
 598         DOM_SID owner_sid, group_sid;
 599         SEC_ACCESS mask;
 600         SMB_STRUCT_STAT sbuf;
 601         SEC_ACL *psa = NULL;
 602         int good_aces;
 603         size_t sd_size;
 604         TALLOC_CTX *mem_ctx = main_loop_talloc_get();
 605
 606         struct afs_ace *afs_ace;
 607
 608         if (fsp->is_directory || fsp->fd == -1) {
 609                 /* Get the stat struct for the owner info. */
 610                 if(SMB_VFS_STAT(fsp->conn,fsp->fsp_name, &sbuf) != 0) {
 611                         return 0;
 612                 }
 613         } else {
 614                 if(SMB_VFS_FSTAT(fsp,fsp->fd,&sbuf) != 0) {
 615                         return 0;
 616                 }
 617         }
 618
 619         uid_to_sid(&owner_sid, sbuf.st_uid);
 620         gid_to_sid(&group_sid, sbuf.st_gid);
 621
 622         nt_ace_list = SMB_MALLOC_ARRAY(SEC_ACE, afs_acl->num_aces);
 623
 624         if (nt_ace_list == NULL)
 625                 return 0;
 626
 627         afs_ace = afs_acl->acelist;
 628         good_aces = 0;
 629
 630         while (afs_ace != NULL) {
 631                 uint32 nt_rights;
 632                 uint8 flag = SEC_ACE_FLAG_OBJECT_INHERIT |
 633                         SEC_ACE_FLAG_CONTAINER_INHERIT;
 634
 635                 if (afs_ace->type == SID_NAME_UNKNOWN) {
 636                         DEBUG(10, ("Ignoring unknown name %s\n",
 637                                    afs_ace->name));
 638                         afs_ace = afs_ace->next;
 639                         continue;
 640                 }
 641
 642                 if (fsp->is_directory)
 643                         afs_to_nt_dir_rights(afs_ace->rights, &nt_rights,
 644                                              &flag);
 645                 else
 646                         nt_rights = afs_to_nt_file_rights(afs_ace->rights);
 647
 648                 init_sec_access(&mask, nt_rights);
 649                 init_sec_ace(&nt_ace_list[good_aces++], &(afs_ace->sid),
 650                              SEC_ACE_TYPE_ACCESS_ALLOWED, mask, flag);
 651                 afs_ace = afs_ace->next;
 652         }
 653
 654         psa = make_sec_acl(mem_ctx, NT4_ACL_REVISION,
 655                            good_aces, nt_ace_list);
 656         if (psa == NULL)
 657                 return 0;
 658
 659
 660         *ppdesc = make_sec_desc(mem_ctx, SEC_DESC_REVISION,
 661                                 SEC_DESC_SELF_RELATIVE,
 662                                 (security_info & OWNER_SECURITY_INFORMATION)
 663                                 ? &owner_sid : NULL,
 664                                 (security_info & GROUP_SECURITY_INFORMATION)
 665                                 ? &group_sid : NULL,
 666                                 NULL, psa, &sd_size);
 667
 668         return sd_size;
 669 }
 670
 671 static BOOL mappable_sid(const DOM_SID *sid)
 672 {
 673         DOM_SID domain_sid;
 674
 675         if (sid_compare(sid, &global_sid_Builtin_Administrators) == 0)
 676                 return True;
 677
 678         if (sid_compare(sid, &global_sid_World) == 0)
 679                 return True;
 680
 681         if (sid_compare(sid, &global_sid_Authenticated_Users) == 0)
 682                 return True;
 683
 684         if (sid_compare(sid, &global_sid_Builtin_Backup_Operators) == 0)
 685                 return True;
 686
 687         string_to_sid(&domain_sid, "S-1-5-21");
 688
 689         if (sid_compare_domain(sid, &domain_sid) == 0)
 690                 return True;
 691
 692         return False;
 693 }
 694
 695 static BOOL nt_to_afs_acl(const char *filename,
 696                           uint32 security_info_sent,
 697                           struct security_descriptor_info *psd,
 698                           uint32 (*nt_to_afs_rights)(const char *filename,
 699                                                      const SEC_ACE *ace),
 700                           struct afs_acl *afs_acl)
 701 {
 702         SEC_ACL *dacl;
 703         int i;
 704
 705         /* Currently we *only* look at the dacl */
 706
 707         if (((security_info_sent & DACL_SECURITY_INFORMATION) == 0) ||
 708             (psd->dacl == NULL))
 709                 return True;
 710
 711         if (!init_afs_acl(afs_acl))
 712                 return False;
 713
 714         dacl = psd->dacl;
 715
 716         for (i = 0; i < dacl->num_aces; i++) {
 717                 SEC_ACE *ace = &(dacl->ace[i]);
 718                 fstring dom_name;
 719                 fstring name;
 720                 enum SID_NAME_USE name_type;
 721                 char *p;
 722
 723                 if (ace->type != SEC_ACE_TYPE_ACCESS_ALLOWED) {
 724                         /* First cut: Only positive ACEs */
 725                         return False;
 726                 }
 727
 728                 if (!mappable_sid(&ace->trustee)) {
 729                         DEBUG(10, ("Ignoring unmappable SID %s\n",
 730                                    sid_string_static(&ace->trustee)));
 731                         continue;
 732                 }
 733
 734                 if (sid_compare(&ace->trustee,
 735                                 &global_sid_Builtin_Administrators) == 0) {
 736
 737                         fstrcpy(name, "system:administrators");
 738
 739                 } else if (sid_compare(&ace->trustee,
 740                                        &global_sid_World) == 0) {
 741
 742                         fstrcpy(name, "system:anyuser");
 743
 744                 } else if (sid_compare(&ace->trustee,
 745                                        &global_sid_Authenticated_Users) == 0) {
 746
 747                         fstrcpy(name, "system:authuser");
 748
 749                 } else if (sid_compare(&ace->trustee,
 750                                        &global_sid_Builtin_Backup_Operators)
 751                            == 0) {
 752
 753                         fstrcpy(name, "system:backup");
 754
 755                 } else {
 756
 757                         if (!lookup_sid(&ace->trustee,
 758                                         dom_name, name, &name_type)) {
 759                                 DEBUG(1, ("AFSACL: Could not lookup SID %s on file %s\n",
 760                                           sid_string_static(&ace->trustee), filename));
 761                                 continue;
 762                         }
 763
 764                         if ( (name_type == SID_NAME_USER) ||
 765                              (name_type == SID_NAME_DOM_GRP) ||
 766                              (name_type == SID_NAME_ALIAS) ) {
 767                                 fstring only_username;
 768                                 fstrcpy(only_username, name);
 769                                 fstr_sprintf(name, "%s%s%s",
 770                                              dom_name, lp_winbind_separator(),
 771                                              only_username);
 772                                 strlower_m(name);
 773                         }
 774                 }
 775
 776                 while ((p = strchr_m(name, ' ')) != NULL)
 777                         *p = space_replacement;
 778
 779                 add_afs_ace(afs_acl, True, name,
 780                             nt_to_afs_rights(filename, ace));
 781         }
 782
 783         return True;
 784 }
 785
 786 static BOOL afs_get_afs_acl(char *filename, struct afs_acl *acl)
 787 {
 788         struct afs_iob iob;
 789
 790         int ret;
 791
 792         char space[MAXSIZE];
 793
 794         DEBUG(5, ("afs_get_afs_acl: %s\n", filename));
 795
 796         iob.in_size = 0;
 797         iob.out_size = MAXSIZE;
 798         iob.in = iob.out = space;
 799
 800         ret = afs_syscall(AFSCALL_PIOCTL, filename, VIOCGETAL,
 801                           (char *)&iob, 0);
 802
 803         if (ret) {
 804                 DEBUG(1, ("got error from PIOCTL: %d\n", ret));
 805                 return False;
 806         }
 807
 808         if (!init_afs_acl(acl))
 809                 return False;
 810
 811         if (!parse_afs_acl(acl, space)) {
 812                 DEBUG(1, ("Could not parse AFS acl\n"));
 813                 free_afs_acl(acl);
 814                 return False;
 815         }
 816
 817         return True;
 818 }
 819
 820 static size_t afs_get_nt_acl(struct files_struct *fsp, uint32 security_info,
 821                              struct security_descriptor_info **ppdesc)
 822 {
 823         struct afs_acl acl;
 824         size_t sd_size;
 825
 826         DEBUG(5, ("afs_get_nt_acl: %s\n", fsp->fsp_name));
 827
 828         if (!afs_get_afs_acl(fsp->fsp_name, &acl)) {
 829                 return 0;
 830         }
 831
 832         sd_size = afs_to_nt_acl(&acl, fsp, security_info, ppdesc);
 833
 834         free_afs_acl(&acl);
 835
 836         return sd_size;
 837 }
 838
 839 /* For setting an AFS ACL we have to take care of the ACEs we could
 840  * not properly map to SIDs. Merge all of them into the new ACL. */
 841
 842 static void merge_unknown_aces(struct afs_acl *src, struct afs_acl *dst)
 843 {
 844         struct afs_ace *ace;
 845
 846         for (ace = src->acelist; ace != NULL; ace = ace->next)
 847         {
 848                 struct afs_ace *copy;
 849
 850                 if (ace->type != SID_NAME_UNKNOWN) {
 851                         DEBUG(10, ("Not merging known ACE for %s\n",
 852                                    ace->name));
 853                         continue;
 854                 }
 855
 856                 DEBUG(10, ("Merging unknown ACE for %s\n", ace->name));
 857
 858                 copy = clone_afs_ace(dst->ctx, ace);
 859
 860                 if (copy == NULL) {
 861                         DEBUG(0, ("Could not clone ACE for %s\n", ace->name));
 862                         continue;
 863                 }
 864
 865                 copy->next = dst->acelist;
 866                 dst->acelist = copy;
 867                 dst->num_aces += 1;
 868         }
 869 }
 870
 871 static BOOL afs_set_nt_acl(vfs_handle_struct *handle, files_struct *fsp,
 872                            uint32 security_info_sent,
 873                            struct security_descriptor_info *psd)
 874 {
 875         struct afs_acl old_afs_acl, new_afs_acl;
 876         struct afs_acl dir_acl, file_acl;
 877         char acl_string[2049];
 878         struct afs_iob iob;
 879         int ret = -1;
 880         pstring name;
 881         const char *fileacls;
 882
 883         fileacls = lp_parm_const_string(SNUM(handle->conn), "afsacl", "fileacls",
 884                                         "yes");
 885
 886         ZERO_STRUCT(old_afs_acl);
 887         ZERO_STRUCT(new_afs_acl);
 888         ZERO_STRUCT(dir_acl);
 889         ZERO_STRUCT(file_acl);
 890
 891         pstr_sprintf(name, fsp->fsp_name);
 892
 893         if (!fsp->is_directory) {
 894                 char *p = strrchr(name, '/');
 895                 if (p == NULL) {
 896                         DEBUG(3, ("No / in file string\n"));
 897                         return False;
 898                 }
 899                 *p = '\0';
 900         }
 901
 902         if (!afs_get_afs_acl(name, &old_afs_acl)) {
 903                 DEBUG(3, ("Could not get old ACL of %s\n", fsp->fsp_name));
 904                 goto done;
 905         }
 906
 907         split_afs_acl(&old_afs_acl, &dir_acl, &file_acl);
 908
 909         if (fsp->is_directory) {
 910
 911                 if (!strequal(fileacls, "yes")) {
 912                         /* Throw away file acls, we depend on the
 913                          * inheritance ACEs that also give us file
 914                          * permissions */
 915                         free_afs_acl(&file_acl);
 916                 }
 917
 918                 free_afs_acl(&dir_acl);
 919                 if (!nt_to_afs_acl(fsp->fsp_name, security_info_sent, psd,
 920                                    nt_to_afs_dir_rights, &dir_acl))
 921                         goto done;
 922         } else {
 923                 if (strequal(fileacls, "no")) {
 924                         ret = -1;
 925                         goto done;
 926                 }
 927
 928                 if (strequal(fileacls, "ignore")) {
 929                         ret = 0;
 930                         goto done;
 931                 }
 932
 933                 free_afs_acl(&file_acl);
 934                 if (!nt_to_afs_acl(fsp->fsp_name, security_info_sent, psd,
 935                                    nt_to_afs_file_rights, &file_acl))
 936                         goto done;
 937         }
 938
 939         merge_afs_acls(&dir_acl, &file_acl, &new_afs_acl);
 940
 941         merge_unknown_aces(&old_afs_acl, &new_afs_acl);
 942
 943         unparse_afs_acl(&new_afs_acl, acl_string);
 944
 945         iob.in = acl_string;
 946         iob.in_size = 1+strlen(iob.in);
 947         iob.out = NULL;
 948         iob.out_size = 0;
 949
 950         DEBUG(10, ("trying to set acl '%s' on file %s\n", iob.in, name));
 951
 952         ret = afs_syscall(AFSCALL_PIOCTL, name, VIOCSETAL, (char *)&iob, 0);
 953
 954         if (ret != 0) {
 955                 DEBUG(10, ("VIOCSETAL returned %d\n", ret));
 956         }
 957
 958  done:
 959         free_afs_acl(&dir_acl);
 960         free_afs_acl(&file_acl);
 961         free_afs_acl(&old_afs_acl);
 962         free_afs_acl(&new_afs_acl);
 963
 964         return (ret == 0);
 965 }
 966
 967 static size_t afsacl_fget_nt_acl(struct vfs_handle_struct *handle,
 968                                  struct files_struct *fsp,
 969                                  int fd,  uint32 security_info,
 970                                  struct security_descriptor_info **ppdesc)
 971 {
 972         return afs_get_nt_acl(fsp, security_info, ppdesc);
 973 }
 974 static size_t afsacl_get_nt_acl(struct vfs_handle_struct *handle,
 975                                 struct files_struct *fsp,
 976                                 const char *name,  uint32 security_info,
 977                                 struct security_descriptor_info **ppdesc)
 978 {
 979         return afs_get_nt_acl(fsp, security_info, ppdesc);
 980 }
 981
 982 BOOL afsacl_fset_nt_acl(vfs_handle_struct *handle,
 983                          files_struct *fsp,
 984                          int fd, uint32 security_info_sent,
 985                          SEC_DESC *psd)
 986 {
 987         return afs_set_nt_acl(handle, fsp, security_info_sent, psd);
 988 }
 989
 990 BOOL afsacl_set_nt_acl(vfs_handle_struct *handle,
 991                        files_struct *fsp,
 992                        const char *name, uint32 security_info_sent,
 993                        SEC_DESC *psd)
 994 {
 995         return afs_set_nt_acl(handle, fsp, security_info_sent, psd);
 996 }
 997
 998 static int afsacl_connect(vfs_handle_struct *handle,
 999                           connection_struct *conn,
1000                           const char *service,
1001                           const char *user)
1002 {
1003         char *spc;
1004
1005         spc = lp_parm_const_string(SNUM(handle->conn), "afsacl", "space", "%");
1006
1007         if (spc != NULL)
1008                 space_replacement = spc[0];
1009
1010         return SMB_VFS_NEXT_CONNECT(handle, conn, service, user);
1011 }
1012
1013 /* VFS operations structure */
1014
1015 static vfs_op_tuple afsacl_ops[] = {
1016         {SMB_VFS_OP(afsacl_connect), SMB_VFS_OP_CONNECT,
1017          SMB_VFS_LAYER_TRANSPARENT},
1018         {SMB_VFS_OP(afsacl_fget_nt_acl), SMB_VFS_OP_FGET_NT_ACL,
1019          SMB_VFS_LAYER_TRANSPARENT},
1020         {SMB_VFS_OP(afsacl_get_nt_acl), SMB_VFS_OP_GET_NT_ACL,
1021          SMB_VFS_LAYER_TRANSPARENT},
1022         {SMB_VFS_OP(afsacl_fset_nt_acl), SMB_VFS_OP_FSET_NT_ACL,
1023          SMB_VFS_LAYER_TRANSPARENT},
1024         {SMB_VFS_OP(afsacl_set_nt_acl), SMB_VFS_OP_SET_NT_ACL,
1025          SMB_VFS_LAYER_TRANSPARENT},
1026         {SMB_VFS_OP(NULL), SMB_VFS_OP_NOOP, SMB_VFS_LAYER_NOOP}
1027 };
1028
1029 NTSTATUS vfs_afsacl_init(void)
1030 {
1031         return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "afsacl",
1032                                 afsacl_ops);
1033 }