source3/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 const DOM_SID global_sid_World;
  35 extern const DOM_SID global_sid_Builtin_Administrators;
  36 extern const DOM_SID global_sid_Builtin_Backup_Operators;
  37 extern const DOM_SID global_sid_Authenticated_Users;
  38 extern const DOM_SID global_sid_NULL;
  39
  40 static char space_replacement = '%';
  41
  42 /* Do we expect SIDs as pts names? */
  43 static BOOL sidpts;
  44
  45 extern int afs_syscall(int, char *, int, char *, int);
  46
  47 struct afs_ace {
  48         BOOL positive;
  49         char *name;
  50         DOM_SID sid;
  51         enum SID_NAME_USE type;
  52         uint32 rights;
  53         struct afs_ace *next;
  54 };
  55
  56 struct afs_acl {
  57         TALLOC_CTX *ctx;
  58         int type;
  59         int num_aces;
  60         struct afs_ace *acelist;
  61 };
  62
  63 struct afs_iob {
  64         char *in, *out;
  65         uint16 in_size, out_size;
  66 };
  67
  68
  69 static BOOL init_afs_acl(struct afs_acl *acl)
  70 {
  71         ZERO_STRUCT(*acl);
  72         acl->ctx = talloc_init("afs_acl");
  73         if (acl->ctx == NULL) {
  74                 DEBUG(10, ("Could not init afs_acl"));
  75                 return False;
  76         }
  77         return True;
  78 }
  79
  80 static void free_afs_acl(struct afs_acl *acl)
  81 {
  82         if (acl->ctx != NULL)
  83                 talloc_destroy(acl->ctx);
  84         acl->ctx = NULL;
  85         acl->num_aces = 0;
  86         acl->acelist = NULL;
  87 }
  88
  89 static struct afs_ace *clone_afs_ace(TALLOC_CTX *mem_ctx, struct afs_ace *ace)
  90 {
  91         struct afs_ace *result = TALLOC_P(mem_ctx, struct afs_ace);
  92
  93         if (result == NULL)
  94                 return NULL;
  95
  96         *result = *ace;
  97
  98         result->next = NULL;
  99         result->name = talloc_strdup(mem_ctx, ace->name);
 100
 101         if (result->name == NULL) {
 102                 return NULL;
 103         }
 104
 105         return result;
 106 }
 107
 108 static struct afs_ace *new_afs_ace(TALLOC_CTX *mem_ctx,
 109                                    BOOL positive,
 110                                    const char *name, uint32 rights)
 111 {
 112         DOM_SID sid;
 113         enum SID_NAME_USE type;
 114         struct afs_ace *result;
 115
 116         if (strcmp(name, "system:administrators") == 0) {
 117
 118                 sid_copy(&sid, &global_sid_Builtin_Administrators);
 119                 type = SID_NAME_ALIAS;
 120
 121         } else if (strcmp(name, "system:anyuser") == 0) {
 122
 123                 sid_copy(&sid, &global_sid_World);
 124                 type = SID_NAME_ALIAS;
 125
 126         } else if (strcmp(name, "system:authuser") == 0) {
 127
 128                 sid_copy(&sid, &global_sid_Authenticated_Users);
 129                 type = SID_NAME_WKN_GRP;
 130
 131         } else if (strcmp(name, "system:backup") == 0) {
 132
 133                 sid_copy(&sid, &global_sid_Builtin_Backup_Operators);
 134                 type = SID_NAME_ALIAS;
 135
 136         } else if (sidpts) {
 137                 /* All PTS users/groups are expressed as SIDs */
 138
 139                 sid_copy(&sid, &global_sid_NULL);
 140                 type = SID_NAME_UNKNOWN;
 141
 142                 if (string_to_sid(&sid, name)) {
 143                         fstring user, domain;
 144                         /* We have to find the type, look up the SID */
 145                         lookup_sid(&sid, domain, user, &type);
 146                 }
 147
 148         } else {
 149
 150                 fstring domain, uname;
 151                 char *p;
 152
 153                 p = strchr_m(name, lp_winbind_separator());
 154                 if (p != NULL) {
 155                         *p = '\\';
 156                 }
 157
 158                 if (!lookup_name(name, LOOKUP_NAME_FULL,
 159                                  domain, uname, &sid, &type)) {
 160                         DEBUG(10, ("Could not find AFS user %s\n", name));
 161
 162                         sid_copy(&sid, &global_sid_NULL);
 163                         type = SID_NAME_UNKNOWN;
 164
 165                 }
 166         }
 167
 168         result = TALLOC_P(mem_ctx, struct afs_ace);
 169
 170         if (result == NULL) {
 171                 DEBUG(0, ("Could not talloc AFS ace\n"));
 172                 return NULL;
 173         }
 174
 175         result->name = talloc_strdup(mem_ctx, name);
 176         if (result->name == NULL) {
 177                 DEBUG(0, ("Could not talloc AFS ace name\n"));
 178                 return NULL;
 179         }
 180
 181         result->sid = sid;
 182         result->type = type;
 183
 184         result->positive = positive;
 185         result->rights = rights;
 186
 187         return result;
 188 }
 189
 190 static void add_afs_ace(struct afs_acl *acl,
 191                         BOOL positive,
 192                         const char *name, uint32 rights)
 193 {
 194         struct afs_ace *ace;
 195
 196         for (ace = acl->acelist; ace != NULL; ace = ace->next) {
 197                 if ((ace->positive == positive) &&
 198                     (strequal(ace->name, name))) {
 199                         ace->rights |= rights;
 200                         return;
 201                 }
 202         }
 203
 204         ace = new_afs_ace(acl->ctx, positive, name, rights);
 205
 206         ace->next = acl->acelist;
 207         acl->acelist = ace;
 208
 209         acl->num_aces += 1;
 210
 211         DEBUG(10, ("add_afs_ace: Added %s entry for %s with rights %d\n",
 212                    ace->positive?"positive":"negative",
 213                    ace->name, ace->rights));
 214
 215         return;
 216 }
 217
 218 /* AFS ACLs in string form are a long string of fields delimited with \n.
 219  *
 220  * First line:  Number of positive entries
 221  * Second line: Number of negative entries
 222  * Third and following lines: The entries themselves
 223  *
 224  * An ACE is a line of two fields, delimited by \t.
 225  *
 226  * First field:  Name
 227  * Second field: Rights
 228  */
 229
 230 static BOOL parse_afs_acl(struct afs_acl *acl, const char *acl_str)
 231 {
 232         int nplus, nminus;
 233         int aces;
 234
 235         char str[MAXSIZE+1];
 236         char *p = str;
 237
 238         strncpy(str, acl_str, MAXSIZE);
 239
 240         if (sscanf(p, "%d", &nplus) != 1)
 241                 return False;
 242
 243         DEBUG(10, ("Found %d positive entries\n", nplus));
 244
 245         if ((p = strchr(p, '\n')) == NULL)
 246                 return False;
 247         p += 1;
 248
 249         if (sscanf(p, "%d", &nminus) != 1)
 250                 return False;
 251
 252         DEBUG(10, ("Found %d negative entries\n", nminus));
 253
 254         if ((p = strchr(p, '\n')) == NULL)
 255                 return False;
 256         p += 1;
 257
 258         for (aces = nplus+nminus; aces > 0; aces--)
 259         {
 260
 261                 const char *namep;
 262                 fstring name;
 263                 uint32 rights;
 264                 char *space;
 265
 266                 namep = 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                 fstrcpy(name, namep);
 281
 282                 while ((space = strchr_m(name, space_replacement)) != NULL)
 283                         *space = ' ';
 284
 285                 add_afs_ace(acl, nplus>0, name, rights);
 286
 287                 nplus -= 1;
 288         }
 289
 290         return True;
 291 }
 292
 293 static BOOL unparse_afs_acl(struct afs_acl *acl, char *acl_str)
 294 {
 295         /* TODO: String length checks!!!! */
 296
 297         int positives = 0;
 298         int negatives = 0;
 299         fstring line;
 300
 301         *acl_str = 0;
 302
 303         struct afs_ace *ace = acl->acelist;
 304
 305         while (ace != NULL) {
 306                 if (ace->positive)
 307                         positives++;
 308                 else
 309                         negatives++;
 310                 ace = ace->next;
 311         }
 312
 313         fstr_sprintf(line, "%d\n", positives);
 314         safe_strcat(acl_str, line, MAXSIZE);
 315
 316         fstr_sprintf(line, "%d\n", negatives);
 317         safe_strcat(acl_str, line, MAXSIZE);
 318
 319         ace = acl->acelist;
 320
 321         while (ace != NULL) {
 322                 fstr_sprintf(line, "%s\t%d\n", ace->name, ace->rights);
 323                 safe_strcat(acl_str, line, MAXSIZE);
 324                 ace = ace->next;
 325         }
 326         return True;
 327 }
 328
 329 static uint32 afs_to_nt_file_rights(uint32 rights)
 330 {
 331         uint32 result = 0;
 332
 333         if (rights & PRSFS_READ)
 334                 result |= FILE_READ_DATA | FILE_READ_EA |
 335                         FILE_EXECUTE | FILE_READ_ATTRIBUTES |
 336                         READ_CONTROL_ACCESS | SYNCHRONIZE_ACCESS;
 337
 338         if (rights & PRSFS_WRITE)
 339                 result |= FILE_WRITE_DATA | FILE_WRITE_ATTRIBUTES |
 340                         FILE_WRITE_EA | FILE_APPEND_DATA;
 341
 342         if (rights & PRSFS_LOCK)
 343                 result |= WRITE_OWNER_ACCESS;
 344
 345         if (rights & PRSFS_DELETE)
 346                 result |= DELETE_ACCESS;
 347
 348         return result;
 349 }
 350
 351 static void afs_to_nt_dir_rights(uint32 afs_rights, uint32 *nt_rights,
 352                                  uint8 *flag)
 353 {
 354         *nt_rights = 0;
 355         *flag = SEC_ACE_FLAG_OBJECT_INHERIT |
 356                 SEC_ACE_FLAG_CONTAINER_INHERIT;
 357
 358         if (afs_rights & PRSFS_INSERT)
 359                 *nt_rights |= FILE_ADD_FILE | FILE_ADD_SUBDIRECTORY;
 360
 361         if (afs_rights & PRSFS_LOOKUP)
 362                 *nt_rights |= FILE_READ_DATA | FILE_READ_EA |
 363                         FILE_EXECUTE | FILE_READ_ATTRIBUTES |
 364                         READ_CONTROL_ACCESS | SYNCHRONIZE_ACCESS;
 365
 366         if (afs_rights & PRSFS_WRITE)
 367                 *nt_rights |= FILE_WRITE_ATTRIBUTES | FILE_WRITE_DATA |
 368                         FILE_APPEND_DATA | FILE_WRITE_EA;
 369
 370         if ((afs_rights & (PRSFS_INSERT|PRSFS_LOOKUP|PRSFS_DELETE)) ==
 371             (PRSFS_INSERT|PRSFS_LOOKUP|PRSFS_DELETE))
 372                 *nt_rights |= FILE_WRITE_ATTRIBUTES | FILE_WRITE_EA |
 373                         GENERIC_WRITE_ACCESS;
 374
 375         if (afs_rights & PRSFS_DELETE)
 376                 *nt_rights |= DELETE_ACCESS;
 377
 378         if (afs_rights & PRSFS_ADMINISTER)
 379                 *nt_rights |= FILE_DELETE_CHILD | WRITE_DAC_ACCESS |
 380                         WRITE_OWNER_ACCESS;
 381
 382         if ( (afs_rights & PRSFS_LOOKUP) ==
 383              (afs_rights & (PRSFS_LOOKUP|PRSFS_READ)) ) {
 384                 /* Only lookup right */
 385                 *flag = SEC_ACE_FLAG_CONTAINER_INHERIT;
 386         }
 387
 388         return;
 389 }
 390
 391 #define AFS_FILE_RIGHTS (PRSFS_READ|PRSFS_WRITE|PRSFS_LOCK)
 392 #define AFS_DIR_RIGHTS  (PRSFS_INSERT|PRSFS_LOOKUP|PRSFS_DELETE|PRSFS_ADMINISTER)
 393
 394 static void split_afs_acl(struct afs_acl *acl,
 395                           struct afs_acl *dir_acl,
 396                           struct afs_acl *file_acl)
 397 {
 398         struct afs_ace *ace;
 399
 400         init_afs_acl(dir_acl);
 401         init_afs_acl(file_acl);
 402
 403         for (ace = acl->acelist; ace != NULL; ace = ace->next) {
 404                 if (ace->rights & AFS_FILE_RIGHTS) {
 405                         add_afs_ace(file_acl, ace->positive, ace->name,
 406                                     ace->rights & AFS_FILE_RIGHTS);
 407                 }
 408
 409                 if (ace->rights & AFS_DIR_RIGHTS) {
 410                         add_afs_ace(dir_acl, ace->positive, ace->name,
 411                                     ace->rights & AFS_DIR_RIGHTS);
 412                 }
 413         }
 414         return;
 415 }
 416
 417 static BOOL same_principal(struct afs_ace *x, struct afs_ace *y)
 418 {
 419         return ( (x->positive == y->positive) &&
 420                  (sid_compare(&x->sid, &y->sid) == 0) );
 421 }
 422
 423 static void merge_afs_acls(struct afs_acl *dir_acl,
 424                            struct afs_acl *file_acl,
 425                            struct afs_acl *target)
 426 {
 427         struct afs_ace *ace;
 428
 429         init_afs_acl(target);
 430
 431         for (ace = dir_acl->acelist; ace != NULL; ace = ace->next) {
 432                 struct afs_ace *file_ace;
 433                 BOOL found = False;
 434
 435                 for (file_ace = file_acl->acelist;
 436                      file_ace != NULL;
 437                      file_ace = file_ace->next) {
 438                         if (!same_principal(ace, file_ace))
 439                                 continue;
 440
 441                         add_afs_ace(target, ace->positive, ace->name,
 442                                     ace->rights | file_ace->rights);
 443                         found = True;
 444                         break;
 445                 }
 446                 if (!found)
 447                         add_afs_ace(target, ace->positive, ace->name,
 448                                     ace->rights);
 449         }
 450
 451         for (ace = file_acl->acelist; ace != NULL; ace = ace->next) {
 452                 struct afs_ace *dir_ace;
 453                 BOOL already_seen = False;
 454
 455                 for (dir_ace = dir_acl->acelist;
 456                      dir_ace != NULL;
 457                      dir_ace = dir_ace->next) {
 458                         if (!same_principal(ace, dir_ace))
 459                                 continue;
 460                         already_seen = True;
 461                         break;
 462                 }
 463                 if (!already_seen)
 464                         add_afs_ace(target, ace->positive, ace->name,
 465                                     ace->rights);
 466         }
 467 }
 468
 469 #define PERMS_READ   0x001200a9
 470 #define PERMS_CHANGE 0x001301bf
 471 #define PERMS_FULL   0x001f01ff
 472
 473 static struct static_dir_ace_mapping {
 474         uint8 type;
 475         uint8 flags;
 476         uint32 mask;
 477         uint32 afs_rights;
 478 } ace_mappings[] = {
 479
 480         /* Full control */
 481         { 0, SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT,
 482           PERMS_FULL, 127 /* rlidwka */ },
 483
 484         /* Change (write) */
 485         { 0, SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT,
 486           PERMS_CHANGE, 63 /* rlidwk */ },
 487
 488         /* Read (including list folder content) */
 489         { 0, SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT,
 490           PERMS_READ, 9 /* rl */ },
 491
 492         /* Read without list folder content -- same as "l" */
 493         { 0, SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT,
 494           0x00120089, 8 /* l */ },
 495
 496         /* some stupid workaround for preventing fallbacks */
 497         { 0, 0x3, 0x0012019F, 9 /* rl */ },
 498         { 0, 0x13, PERMS_FULL, 127 /* full */ },
 499
 500         /* read, delete and execute access plus synchronize */
 501         { 0, 0x3, 0x001300A9, 9 /* should be rdl, set to rl */},
 502         /* classical read list */
 503         { 0, 0x13, 0x001200A9, 9 /* rl */},
 504         /* almost full control, no delete */
 505         { 0, 0x13, PERMS_CHANGE, 63 /* rwidlk */},
 506
 507         /* List folder */
 508         { 0, SEC_ACE_FLAG_CONTAINER_INHERIT,
 509           PERMS_READ, 8 /* l */ },
 510
 511         /* FULL without inheritance -- in all cases here we also get
 512            the corresponding INHERIT_ONLY ACE in the same ACL */
 513         { 0, 0, PERMS_FULL, 127 /* rlidwka */ },
 514
 515         /* FULL inherit only -- counterpart to previous one */
 516         { 0, SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_INHERIT_ONLY,
 517           PERMS_FULL | GENERIC_RIGHT_WRITE_ACCESS, 127 /* rlidwka */ },
 518
 519         /* CHANGE without inheritance -- in all cases here we also get
 520            the corresponding INHERIT_ONLY ACE in the same ACL */
 521         { 0, 0, PERMS_CHANGE, 63 /* rlidwk */ },
 522
 523         /* CHANGE inherit only -- counterpart to previous one */
 524         { 0, SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_INHERIT_ONLY,
 525           PERMS_CHANGE | GENERIC_RIGHT_WRITE_ACCESS, 63 /* rlidwk */ },
 526
 527         /* End marker, hopefully there's no afs right 9999 :-) */
 528         { 0, 0, 0, 9999 }
 529 };
 530
 531 static uint32 nt_to_afs_dir_rights(const char *filename, const SEC_ACE *ace)
 532 {
 533         uint32 result = 0;
 534         uint32 rights = ace->info.mask;
 535         uint8 flags = ace->flags;
 536
 537         struct static_dir_ace_mapping *m;
 538
 539         for (m = &ace_mappings[0]; m->afs_rights != 9999; m++) {
 540                 if ( (ace->type == m->type) &&
 541                      (ace->flags == m->flags) &&
 542                      (ace->info.mask == m->mask) )
 543                         return m->afs_rights;
 544         }
 545
 546         DEBUG(1, ("AFSACL FALLBACK: 0x%X 0x%X 0x%X %s %X\n",
 547                   ace->type, ace->flags, ace->info.mask, filename, rights));
 548
 549         if (rights & (GENERIC_ALL_ACCESS|WRITE_DAC_ACCESS)) {
 550                 result |= PRSFS_READ | PRSFS_WRITE | PRSFS_INSERT |
 551                         PRSFS_LOOKUP | PRSFS_DELETE | PRSFS_LOCK |
 552                         PRSFS_ADMINISTER;
 553         }
 554
 555         if (rights & (GENERIC_READ_ACCESS|FILE_READ_DATA)) {
 556                 result |= PRSFS_LOOKUP;
 557                 if (flags & SEC_ACE_FLAG_OBJECT_INHERIT) {
 558                         result |= PRSFS_READ;
 559                 }
 560         }
 561
 562         if (rights & (GENERIC_WRITE_ACCESS|FILE_WRITE_DATA)) {
 563                 result |= PRSFS_INSERT | PRSFS_DELETE;
 564                 if (flags & SEC_ACE_FLAG_OBJECT_INHERIT) {
 565                         result |= PRSFS_WRITE | PRSFS_LOCK;
 566                 }
 567         }
 568
 569         return result;
 570 }
 571
 572 static uint32 nt_to_afs_file_rights(const char *filename, const SEC_ACE *ace)
 573 {
 574         uint32 result = 0;
 575         uint32 rights = ace->info.mask;
 576
 577         if (rights & (GENERIC_READ_ACCESS|FILE_READ_DATA)) {
 578                 result |= PRSFS_READ;
 579         }
 580
 581         if (rights & (GENERIC_WRITE_ACCESS|FILE_WRITE_DATA)) {
 582                 result |= PRSFS_WRITE | PRSFS_LOCK;
 583         }
 584
 585         return result;
 586 }
 587
 588 static size_t afs_to_nt_acl(struct afs_acl *afs_acl,
 589                             struct files_struct *fsp,
 590                             uint32 security_info,
 591                             struct security_descriptor_info **ppdesc)
 592 {
 593         SEC_ACE *nt_ace_list;
 594         DOM_SID owner_sid, group_sid;
 595         SEC_ACCESS mask;
 596         SMB_STRUCT_STAT sbuf;
 597         SEC_ACL *psa = NULL;
 598         int good_aces;
 599         size_t sd_size;
 600         TALLOC_CTX *mem_ctx = main_loop_talloc_get();
 601
 602         struct afs_ace *afs_ace;
 603
 604         if (fsp->is_directory || fsp->fh->fd == -1) {
 605                 /* Get the stat struct for the owner info. */
 606                 if(SMB_VFS_STAT(fsp->conn,fsp->fsp_name, &sbuf) != 0) {
 607                         return 0;
 608                 }
 609         } else {
 610                 if(SMB_VFS_FSTAT(fsp,fsp->fh->fd,&sbuf) != 0) {
 611                         return 0;
 612                 }
 613         }
 614
 615         uid_to_sid(&owner_sid, sbuf.st_uid);
 616         gid_to_sid(&group_sid, sbuf.st_gid);
 617
 618         nt_ace_list = TALLOC_ARRAY(mem_ctx, SEC_ACE, afs_acl->num_aces);
 619
 620         if (nt_ace_list == NULL)
 621                 return 0;
 622
 623         afs_ace = afs_acl->acelist;
 624         good_aces = 0;
 625
 626         while (afs_ace != NULL) {
 627                 uint32 nt_rights;
 628                 uint8 flag = SEC_ACE_FLAG_OBJECT_INHERIT |
 629                         SEC_ACE_FLAG_CONTAINER_INHERIT;
 630
 631                 if (afs_ace->type == SID_NAME_UNKNOWN) {
 632                         DEBUG(10, ("Ignoring unknown name %s\n",
 633                                    afs_ace->name));
 634                         afs_ace = afs_ace->next;
 635                         continue;
 636                 }
 637
 638                 if (fsp->is_directory)
 639                         afs_to_nt_dir_rights(afs_ace->rights, &nt_rights,
 640                                              &flag);
 641                 else
 642                         nt_rights = afs_to_nt_file_rights(afs_ace->rights);
 643
 644                 init_sec_access(&mask, nt_rights);
 645                 init_sec_ace(&nt_ace_list[good_aces++], &(afs_ace->sid),
 646                              SEC_ACE_TYPE_ACCESS_ALLOWED, mask, flag);
 647                 afs_ace = afs_ace->next;
 648         }
 649
 650         psa = make_sec_acl(mem_ctx, NT4_ACL_REVISION,
 651                            good_aces, nt_ace_list);
 652         if (psa == NULL)
 653                 return 0;
 654
 655
 656         *ppdesc = make_sec_desc(mem_ctx, SEC_DESC_REVISION,
 657                                 SEC_DESC_SELF_RELATIVE,
 658                                 (security_info & OWNER_SECURITY_INFORMATION)
 659                                 ? &owner_sid : NULL,
 660                                 (security_info & GROUP_SECURITY_INFORMATION)
 661                                 ? &group_sid : NULL,
 662                                 NULL, psa, &sd_size);
 663
 664         return sd_size;
 665 }
 666
 667 static BOOL mappable_sid(const DOM_SID *sid)
 668 {
 669         DOM_SID domain_sid;
 670
 671         if (sid_compare(sid, &global_sid_Builtin_Administrators) == 0)
 672                 return True;
 673
 674         if (sid_compare(sid, &global_sid_World) == 0)
 675                 return True;
 676
 677         if (sid_compare(sid, &global_sid_Authenticated_Users) == 0)
 678                 return True;
 679
 680         if (sid_compare(sid, &global_sid_Builtin_Backup_Operators) == 0)
 681                 return True;
 682
 683         string_to_sid(&domain_sid, "S-1-5-21");
 684
 685         if (sid_compare_domain(sid, &domain_sid) == 0)
 686                 return True;
 687
 688         return False;
 689 }
 690
 691 static BOOL nt_to_afs_acl(const char *filename,
 692                           uint32 security_info_sent,
 693                           struct security_descriptor_info *psd,
 694                           uint32 (*nt_to_afs_rights)(const char *filename,
 695                                                      const SEC_ACE *ace),
 696                           struct afs_acl *afs_acl)
 697 {
 698         SEC_ACL *dacl;
 699         int i;
 700
 701         /* Currently we *only* look at the dacl */
 702
 703         if (((security_info_sent & DACL_SECURITY_INFORMATION) == 0) ||
 704             (psd->dacl == NULL))
 705                 return True;
 706
 707         if (!init_afs_acl(afs_acl))
 708                 return False;
 709
 710         dacl = psd->dacl;
 711
 712         for (i = 0; i < dacl->num_aces; i++) {
 713                 SEC_ACE *ace = &(dacl->ace[i]);
 714                 fstring dom_name;
 715                 fstring name;
 716                 enum SID_NAME_USE name_type;
 717                 char *p;
 718
 719                 if (ace->type != SEC_ACE_TYPE_ACCESS_ALLOWED) {
 720                         /* First cut: Only positive ACEs */
 721                         return False;
 722                 }
 723
 724                 if (!mappable_sid(&ace->trustee)) {
 725                         DEBUG(10, ("Ignoring unmappable SID %s\n",
 726                                    sid_string_static(&ace->trustee)));
 727                         continue;
 728                 }
 729
 730                 if (sid_compare(&ace->trustee,
 731                                 &global_sid_Builtin_Administrators) == 0) {
 732
 733                         fstrcpy(name, "system:administrators");
 734
 735                 } else if (sid_compare(&ace->trustee,
 736                                        &global_sid_World) == 0) {
 737
 738                         fstrcpy(name, "system:anyuser");
 739
 740                 } else if (sid_compare(&ace->trustee,
 741                                        &global_sid_Authenticated_Users) == 0) {
 742
 743                         fstrcpy(name, "system:authuser");
 744
 745                 } else if (sid_compare(&ace->trustee,
 746                                        &global_sid_Builtin_Backup_Operators)
 747                            == 0) {
 748
 749                         fstrcpy(name, "system:backup");
 750
 751                 } else {
 752
 753                         if (!lookup_sid(&ace->trustee,
 754                                         dom_name, name, &name_type)) {
 755                                 DEBUG(1, ("AFSACL: Could not lookup SID %s on file %s\n",
 756                                           sid_string_static(&ace->trustee), filename));
 757                                 continue;
 758                         }
 759
 760                         if ( (name_type == SID_NAME_USER) ||
 761                              (name_type == SID_NAME_DOM_GRP) ||
 762                              (name_type == SID_NAME_ALIAS) ) {
 763                                 fstring only_username;
 764                                 fstrcpy(only_username, name);
 765                                 fstr_sprintf(name, "%s%s%s",
 766                                              dom_name, lp_winbind_separator(),
 767                                              only_username);
 768                                 strlower_m(name);
 769                         }
 770
 771                         if (sidpts) {
 772                                 /* Expect all users/groups in pts as SIDs */
 773                                 sid_to_string(name, &ace->trustee);
 774                         }
 775                 }
 776
 777                 while ((p = strchr_m(name, ' ')) != NULL)
 778                         *p = space_replacement;
 779
 780                 add_afs_ace(afs_acl, True, name,
 781                             nt_to_afs_rights(filename, ace));
 782         }
 783
 784         return True;
 785 }
 786
 787 static BOOL afs_get_afs_acl(char *filename, struct afs_acl *acl)
 788 {
 789         struct afs_iob iob;
 790
 791         int ret;
 792
 793         char space[MAXSIZE];
 794
 795         DEBUG(5, ("afs_get_afs_acl: %s\n", filename));
 796
 797         iob.in_size = 0;
 798         iob.out_size = MAXSIZE;
 799         iob.in = iob.out = space;
 800
 801         ret = afs_syscall(AFSCALL_PIOCTL, filename, VIOCGETAL,
 802                           (char *)&iob, 0);
 803
 804         if (ret) {
 805                 DEBUG(1, ("got error from PIOCTL: %d\n", ret));
 806                 return False;
 807         }
 808
 809         if (!init_afs_acl(acl))
 810                 return False;
 811
 812         if (!parse_afs_acl(acl, space)) {
 813                 DEBUG(1, ("Could not parse AFS acl\n"));
 814                 free_afs_acl(acl);
 815                 return False;
 816         }
 817
 818         return True;
 819 }
 820
 821 static size_t afs_get_nt_acl(struct files_struct *fsp, uint32 security_info,
 822                              struct security_descriptor_info **ppdesc)
 823 {
 824         struct afs_acl acl;
 825         size_t sd_size;
 826
 827         DEBUG(5, ("afs_get_nt_acl: %s\n", fsp->fsp_name));
 828
 829         sidpts = lp_parm_bool(SNUM(fsp->conn), "afsacl", "sidpts", False);
 830
 831         if (!afs_get_afs_acl(fsp->fsp_name, &acl)) {
 832                 return 0;
 833         }
 834
 835         sd_size = afs_to_nt_acl(&acl, fsp, security_info, ppdesc);
 836
 837         free_afs_acl(&acl);
 838
 839         return sd_size;
 840 }
 841
 842 /* For setting an AFS ACL we have to take care of the ACEs we could
 843  * not properly map to SIDs. Merge all of them into the new ACL. */
 844
 845 static void merge_unknown_aces(struct afs_acl *src, struct afs_acl *dst)
 846 {
 847         struct afs_ace *ace;
 848
 849         for (ace = src->acelist; ace != NULL; ace = ace->next)
 850         {
 851                 struct afs_ace *copy;
 852
 853                 if (ace->type != SID_NAME_UNKNOWN) {
 854                         DEBUG(10, ("Not merging known ACE for %s\n",
 855                                    ace->name));
 856                         continue;
 857                 }
 858
 859                 DEBUG(10, ("Merging unknown ACE for %s\n", ace->name));
 860
 861                 copy = clone_afs_ace(dst->ctx, ace);
 862
 863                 if (copy == NULL) {
 864                         DEBUG(0, ("Could not clone ACE for %s\n", ace->name));
 865                         continue;
 866                 }
 867
 868                 copy->next = dst->acelist;
 869                 dst->acelist = copy;
 870                 dst->num_aces += 1;
 871         }
 872 }
 873
 874 static BOOL afs_set_nt_acl(vfs_handle_struct *handle, files_struct *fsp,
 875                            uint32 security_info_sent,
 876                            struct security_descriptor_info *psd)
 877 {
 878         struct afs_acl old_afs_acl, new_afs_acl;
 879         struct afs_acl dir_acl, file_acl;
 880         char acl_string[2049];
 881         struct afs_iob iob;
 882         int ret = -1;
 883         pstring name;
 884         const char *fileacls;
 885
 886         fileacls = lp_parm_const_string(SNUM(handle->conn), "afsacl", "fileacls",
 887                                         "yes");
 888
 889         sidpts = lp_parm_bool(SNUM(handle->conn), "afsacl", "sidpts", False);
 890
 891         ZERO_STRUCT(old_afs_acl);
 892         ZERO_STRUCT(new_afs_acl);
 893         ZERO_STRUCT(dir_acl);
 894         ZERO_STRUCT(file_acl);
 895
 896         pstr_sprintf(name, fsp->fsp_name);
 897
 898         if (!fsp->is_directory) {
 899                 /* We need to get the name of the directory containing the
 900                  * file, this is where the AFS acls live */
 901                 char *p = strrchr(name, '/');
 902                 if (p != NULL) {
 903                         *p = '\0';
 904                 } else {
 905                         pstrcpy(name, ".");
 906                 }
 907         }
 908
 909         if (!afs_get_afs_acl(name, &old_afs_acl)) {
 910                 DEBUG(3, ("Could not get old ACL of %s\n", fsp->fsp_name));
 911                 goto done;
 912         }
 913
 914         split_afs_acl(&old_afs_acl, &dir_acl, &file_acl);
 915
 916         if (fsp->is_directory) {
 917
 918                 if (!strequal(fileacls, "yes")) {
 919                         /* Throw away file acls, we depend on the
 920                          * inheritance ACEs that also give us file
 921                          * permissions */
 922                         free_afs_acl(&file_acl);
 923                 }
 924
 925                 free_afs_acl(&dir_acl);
 926                 if (!nt_to_afs_acl(fsp->fsp_name, security_info_sent, psd,
 927                                    nt_to_afs_dir_rights, &dir_acl))
 928                         goto done;
 929         } else {
 930                 if (strequal(fileacls, "no")) {
 931                         ret = -1;
 932                         goto done;
 933                 }
 934
 935                 if (strequal(fileacls, "ignore")) {
 936                         ret = 0;
 937                         goto done;
 938                 }
 939
 940                 free_afs_acl(&file_acl);
 941                 if (!nt_to_afs_acl(fsp->fsp_name, security_info_sent, psd,
 942                                    nt_to_afs_file_rights, &file_acl))
 943                         goto done;
 944         }
 945
 946         merge_afs_acls(&dir_acl, &file_acl, &new_afs_acl);
 947
 948         merge_unknown_aces(&old_afs_acl, &new_afs_acl);
 949
 950         unparse_afs_acl(&new_afs_acl, acl_string);
 951
 952         iob.in = acl_string;
 953         iob.in_size = 1+strlen(iob.in);
 954         iob.out = NULL;
 955         iob.out_size = 0;
 956
 957         DEBUG(10, ("trying to set acl '%s' on file %s\n", iob.in, name));
 958
 959         ret = afs_syscall(AFSCALL_PIOCTL, name, VIOCSETAL, (char *)&iob, 0);
 960
 961         if (ret != 0) {
 962                 DEBUG(10, ("VIOCSETAL returned %d\n", ret));
 963         }
 964
 965  done:
 966         free_afs_acl(&dir_acl);
 967         free_afs_acl(&file_acl);
 968         free_afs_acl(&old_afs_acl);
 969         free_afs_acl(&new_afs_acl);
 970
 971         return (ret == 0);
 972 }
 973
 974 static size_t afsacl_fget_nt_acl(struct vfs_handle_struct *handle,
 975                                  struct files_struct *fsp,
 976                                  int fd,  uint32 security_info,
 977                                  struct security_descriptor_info **ppdesc)
 978 {
 979         return afs_get_nt_acl(fsp, security_info, ppdesc);
 980 }
 981 static size_t afsacl_get_nt_acl(struct vfs_handle_struct *handle,
 982                                 struct files_struct *fsp,
 983                                 const char *name,  uint32 security_info,
 984                                 struct security_descriptor_info **ppdesc)
 985 {
 986         return afs_get_nt_acl(fsp, security_info, ppdesc);
 987 }
 988
 989 BOOL afsacl_fset_nt_acl(vfs_handle_struct *handle,
 990                          files_struct *fsp,
 991                          int fd, uint32 security_info_sent,
 992                          SEC_DESC *psd)
 993 {
 994         return afs_set_nt_acl(handle, fsp, security_info_sent, psd);
 995 }
 996
 997 BOOL afsacl_set_nt_acl(vfs_handle_struct *handle,
 998                        files_struct *fsp,
 999                        const char *name, uint32 security_info_sent,
1000                        SEC_DESC *psd)
1001 {
1002         return afs_set_nt_acl(handle, fsp, security_info_sent, psd);
1003 }
1004
1005 static int afsacl_connect(vfs_handle_struct *handle,
1006                           connection_struct *conn,
1007                           const char *service,
1008                           const char *user)
1009 {
1010         char *spc;
1011
1012         spc = lp_parm_const_string(SNUM(handle->conn), "afsacl", "space", "%");
1013
1014         if (spc != NULL)
1015                 space_replacement = spc[0];
1016
1017         return SMB_VFS_NEXT_CONNECT(handle, conn, service, user);
1018 }
1019
1020 /* VFS operations structure */
1021
1022 static vfs_op_tuple afsacl_ops[] = {
1023         {SMB_VFS_OP(afsacl_connect), SMB_VFS_OP_CONNECT,
1024          SMB_VFS_LAYER_TRANSPARENT},
1025         {SMB_VFS_OP(afsacl_fget_nt_acl), SMB_VFS_OP_FGET_NT_ACL,
1026          SMB_VFS_LAYER_TRANSPARENT},
1027         {SMB_VFS_OP(afsacl_get_nt_acl), SMB_VFS_OP_GET_NT_ACL,
1028          SMB_VFS_LAYER_TRANSPARENT},
1029         {SMB_VFS_OP(afsacl_fset_nt_acl), SMB_VFS_OP_FSET_NT_ACL,
1030          SMB_VFS_LAYER_TRANSPARENT},
1031         {SMB_VFS_OP(afsacl_set_nt_acl), SMB_VFS_OP_SET_NT_ACL,
1032          SMB_VFS_LAYER_TRANSPARENT},
1033         {SMB_VFS_OP(NULL), SMB_VFS_OP_NOOP, SMB_VFS_LAYER_NOOP}
1034 };
1035
1036 NTSTATUS vfs_afsacl_init(void)
1037 {
1038         return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "afsacl",
1039                                 afsacl_ops);
1040 }