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 3 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, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include "includes.h"
  21 #include "system/filesys.h"
  22 #include "smbd/smbd.h"
  23 #include "../librpc/gen_ndr/lsa.h"
  24 #include "../libcli/security/security.h"
  25 #include "../libcli/security/dom_sid.h"
  26 #include "passdb.h"
  27 #include "lib/afs/afs_settoken.h"
  28
  29 #undef DBGC_CLASS
  30 #define DBGC_CLASS DBGC_VFS
  31
  32 #include <afs/stds.h>
  33 #include <afs/afs_args.h>
  34 #include <afs/venus.h>
  35 #include <afs/prs_fs.h>
  36
  37 #define MAXSIZE 2049
  38
  39 extern const struct dom_sid global_sid_World;
  40 extern const struct dom_sid global_sid_Builtin_Administrators;
  41 extern const struct dom_sid global_sid_Builtin_Backup_Operators;
  42 extern const struct dom_sid global_sid_Authenticated_Users;
  43 extern const struct dom_sid global_sid_NULL;
  44
  45 static char space_replacement = '%';
  46
  47 /* Do we expect SIDs as pts names? */
  48 static bool sidpts;
  49
  50 struct afs_ace {
  51         bool positive;
  52         char *name;
  53         struct dom_sid sid;
  54         enum lsa_SidType type;
  55         uint32_t rights;
  56         struct afs_ace *next;
  57 };
  58
  59 struct afs_acl {
  60         TALLOC_CTX *ctx;
  61         int type;
  62         int num_aces;
  63         struct afs_ace *acelist;
  64 };
  65
  66 struct afs_iob {
  67         char *in, *out;
  68         uint16_t in_size, out_size;
  69 };
  70
  71
  72 static bool init_afs_acl(struct afs_acl *acl)
  73 {
  74         ZERO_STRUCT(*acl);
  75         acl->ctx = talloc_init("afs_acl");
  76         if (acl->ctx == NULL) {
  77                 DEBUG(10, ("Could not init afs_acl"));
  78                 return false;
  79         }
  80         return true;
  81 }
  82
  83 static void free_afs_acl(struct afs_acl *acl)
  84 {
  85         if (acl->ctx != NULL)
  86                 talloc_destroy(acl->ctx);
  87         acl->ctx = NULL;
  88         acl->num_aces = 0;
  89         acl->acelist = NULL;
  90 }
  91
  92 static struct afs_ace *clone_afs_ace(TALLOC_CTX *mem_ctx, struct afs_ace *ace)
  93 {
  94         struct afs_ace *result = talloc(mem_ctx, struct afs_ace);
  95
  96         if (result == NULL)
  97                 return NULL;
  98
  99         *result = *ace;
 100
 101         result->next = NULL;
 102         result->name = talloc_strdup(mem_ctx, ace->name);
 103
 104         if (result->name == NULL) {
 105                 return NULL;
 106         }
 107
 108         return result;
 109 }
 110
 111 static struct afs_ace *new_afs_ace(TALLOC_CTX *mem_ctx,
 112                                    bool positive,
 113                                    const char *name, uint32_t rights)
 114 {
 115         struct dom_sid sid;
 116         enum lsa_SidType type;
 117         struct afs_ace *result;
 118
 119         if (strcmp(name, "system:administrators") == 0) {
 120
 121                 sid_copy(&sid, &global_sid_Builtin_Administrators);
 122                 type = SID_NAME_ALIAS;
 123
 124         } else if (strcmp(name, "system:anyuser") == 0) {
 125
 126                 sid_copy(&sid, &global_sid_World);
 127                 type = SID_NAME_ALIAS;
 128
 129         } else if (strcmp(name, "system:authuser") == 0) {
 130
 131                 sid_copy(&sid, &global_sid_Authenticated_Users);
 132                 type = SID_NAME_WKN_GRP;
 133
 134         } else if (strcmp(name, "system:backup") == 0) {
 135
 136                 sid_copy(&sid, &global_sid_Builtin_Backup_Operators);
 137                 type = SID_NAME_ALIAS;
 138
 139         } else if (sidpts) {
 140                 /* All PTS users/groups are expressed as SIDs */
 141
 142                 sid_copy(&sid, &global_sid_NULL);
 143                 type = SID_NAME_UNKNOWN;
 144
 145                 if (string_to_sid(&sid, name)) {
 146                         const char *user, *domain;
 147                         /* We have to find the type, look up the SID */
 148                         lookup_sid(talloc_tos(), &sid,
 149                                    &domain, &user, &type);
 150                 }
 151
 152         } else {
 153
 154                 const char *domain, *uname;
 155                 char *p;
 156
 157                 p = strchr_m(name, *lp_winbind_separator());
 158                 if (p != NULL) {
 159                         *p = '\\';
 160                 }
 161
 162                 if (!lookup_name(talloc_tos(), name, LOOKUP_NAME_ALL,
 163                                  &domain, &uname, &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(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_t 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
 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];
 238         char *p = str;
 239
 240         strlcpy(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 *namep;
 264                 fstring name;
 265                 uint32_t rights;
 266                 char *space;
 267
 268                 namep = p;
 269
 270                 if ((p = strchr(p, '\t')) == NULL)
 271                         return false;
 272                 *p = '\0';
 273                 p += 1;
 274
 275                 if (sscanf(p, "%d", &rights) != 1)
 276                         return false;
 277
 278                 if ((p = strchr(p, '\n')) == NULL)
 279                         return false;
 280                 p += 1;
 281
 282                 fstrcpy(name, namep);
 283
 284                 while ((space = strchr_m(name, space_replacement)) != NULL)
 285                         *space = ' ';
 286
 287                 add_afs_ace(acl, nplus>0, name, rights);
 288
 289                 nplus -= 1;
 290         }
 291
 292         return true;
 293 }
 294
 295 static bool unparse_afs_acl(struct afs_acl *acl, char *acl_str)
 296 {
 297         /* TODO: String length checks!!!! */
 298
 299         int positives = 0;
 300         int negatives = 0;
 301         fstring line;
 302         struct afs_ace *ace = acl->acelist;
 303
 304         *acl_str = 0;
 305
 306         while (ace != NULL) {
 307                 if (ace->positive)
 308                         positives++;
 309                 else
 310                         negatives++;
 311                 ace = ace->next;
 312         }
 313
 314         fstr_sprintf(line, "%d\n", positives);
 315         if (strlcat(acl_str, line, MAXSIZE) >= MAXSIZE) {
 316                 return false;
 317         }
 318
 319         fstr_sprintf(line, "%d\n", negatives);
 320         if (strlcat(acl_str, line, MAXSIZE) >= MAXSIZE) {
 321                 return false;
 322         }
 323
 324         ace = acl->acelist;
 325
 326         while (ace != NULL) {
 327                 fstr_sprintf(line, "%s\t%d\n", ace->name, ace->rights);
 328                 if (strlcat(acl_str, line, MAXSIZE) >= MAXSIZE) {
 329                         return false;
 330                 }
 331                 ace = ace->next;
 332         }
 333         return true;
 334 }
 335
 336 static uint32_t afs_to_nt_file_rights(uint32_t rights)
 337 {
 338         uint32_t result = 0;
 339
 340         if (rights & PRSFS_READ)
 341                 result |= FILE_READ_DATA | FILE_READ_EA |
 342                         FILE_EXECUTE | FILE_READ_ATTRIBUTES |
 343                         READ_CONTROL_ACCESS | SYNCHRONIZE_ACCESS;
 344
 345         if (rights & PRSFS_WRITE)
 346                 result |= FILE_WRITE_DATA | FILE_WRITE_ATTRIBUTES |
 347                         FILE_WRITE_EA | FILE_APPEND_DATA;
 348
 349         if (rights & PRSFS_LOCK)
 350                 result |= WRITE_OWNER_ACCESS;
 351
 352         if (rights & PRSFS_DELETE)
 353                 result |= DELETE_ACCESS;
 354
 355         return result;
 356 }
 357
 358 static void afs_to_nt_dir_rights(uint32_t afs_rights, uint32_t *nt_rights,
 359                                  uint8_t *flag)
 360 {
 361         *nt_rights = 0;
 362         *flag = SEC_ACE_FLAG_OBJECT_INHERIT |
 363                 SEC_ACE_FLAG_CONTAINER_INHERIT;
 364
 365         if (afs_rights & PRSFS_INSERT)
 366                 *nt_rights |= FILE_ADD_FILE | FILE_ADD_SUBDIRECTORY;
 367
 368         if (afs_rights & PRSFS_LOOKUP)
 369                 *nt_rights |= FILE_READ_DATA | FILE_READ_EA |
 370                         FILE_EXECUTE | FILE_READ_ATTRIBUTES |
 371                         READ_CONTROL_ACCESS | SYNCHRONIZE_ACCESS;
 372
 373         if (afs_rights & PRSFS_WRITE)
 374                 *nt_rights |= FILE_WRITE_ATTRIBUTES | FILE_WRITE_DATA |
 375                         FILE_APPEND_DATA | FILE_WRITE_EA;
 376
 377         if ((afs_rights & (PRSFS_INSERT|PRSFS_LOOKUP|PRSFS_DELETE)) ==
 378             (PRSFS_INSERT|PRSFS_LOOKUP|PRSFS_DELETE))
 379                 *nt_rights |= FILE_WRITE_ATTRIBUTES | FILE_WRITE_EA |
 380                         GENERIC_WRITE_ACCESS;
 381
 382         if (afs_rights & PRSFS_DELETE)
 383                 *nt_rights |= DELETE_ACCESS;
 384
 385         if (afs_rights & PRSFS_ADMINISTER)
 386                 *nt_rights |= FILE_DELETE_CHILD | WRITE_DAC_ACCESS |
 387                         WRITE_OWNER_ACCESS;
 388
 389         if ( (afs_rights & PRSFS_LOOKUP) ==
 390              (afs_rights & (PRSFS_LOOKUP|PRSFS_READ)) ) {
 391                 /* Only lookup right */
 392                 *flag = SEC_ACE_FLAG_CONTAINER_INHERIT;
 393         }
 394 }
 395
 396 #define AFS_FILE_RIGHTS (PRSFS_READ|PRSFS_WRITE|PRSFS_LOCK)
 397 #define AFS_DIR_RIGHTS  (PRSFS_INSERT|PRSFS_LOOKUP|PRSFS_DELETE|PRSFS_ADMINISTER)
 398
 399 static void split_afs_acl(struct afs_acl *acl,
 400                           struct afs_acl *dir_acl,
 401                           struct afs_acl *file_acl)
 402 {
 403         struct afs_ace *ace;
 404
 405         init_afs_acl(dir_acl);
 406         init_afs_acl(file_acl);
 407
 408         for (ace = acl->acelist; ace != NULL; ace = ace->next) {
 409                 if (ace->rights & AFS_FILE_RIGHTS) {
 410                         add_afs_ace(file_acl, ace->positive, ace->name,
 411                                     ace->rights & AFS_FILE_RIGHTS);
 412                 }
 413
 414                 if (ace->rights & AFS_DIR_RIGHTS) {
 415                         add_afs_ace(dir_acl, ace->positive, ace->name,
 416                                     ace->rights & AFS_DIR_RIGHTS);
 417                 }
 418         }
 419 }
 420
 421 static bool same_principal(struct afs_ace *x, struct afs_ace *y)
 422 {
 423         return ( (x->positive == y->positive) &&
 424                  (dom_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_t type;
 479         uint8_t flags;
 480         uint32_t mask;
 481         uint32_t 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 | SEC_GENERIC_WRITE, 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 | SEC_GENERIC_WRITE, 63 /* rlidwk */ },
 530
 531         /* End marker, hopefully there's no afs right 9999 :-) */
 532         { 0, 0, 0, 9999 }
 533 };
 534
 535 static uint32_t nt_to_afs_dir_rights(const char *filename, const struct security_ace *ace)
 536 {
 537         uint32_t result = 0;
 538         uint32_t rights = ace->access_mask;
 539         uint8_t 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->access_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->access_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_t nt_to_afs_file_rights(const char *filename, const struct security_ace *ace)
 577 {
 578         uint32_t result = 0;
 579         uint32_t rights = ace->access_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_common(struct afs_acl *afs_acl,
 593                                    SMB_STRUCT_STAT *psbuf,
 594                                    uint32_t security_info,
 595                                    TALLOC_CTX *mem_ctx,
 596                                    struct security_descriptor **ppdesc)
 597 {
 598         struct security_ace *nt_ace_list;
 599         struct dom_sid owner_sid, group_sid;
 600         struct security_acl *psa = NULL;
 601         int good_aces;
 602         size_t sd_size;
 603
 604         struct afs_ace *afs_ace;
 605
 606         uid_to_sid(&owner_sid, psbuf->st_ex_uid);
 607         gid_to_sid(&group_sid, psbuf->st_ex_gid);
 608
 609         if (afs_acl->num_aces) {
 610                 nt_ace_list = talloc_array(mem_ctx, struct security_ace, afs_acl->num_aces);
 611
 612                 if (nt_ace_list == NULL)
 613                         return 0;
 614         } else {
 615                 nt_ace_list = NULL;
 616         }
 617
 618         afs_ace = afs_acl->acelist;
 619         good_aces = 0;
 620
 621         while (afs_ace != NULL) {
 622                 uint32_t nt_rights;
 623                 uint8_t flag = SEC_ACE_FLAG_OBJECT_INHERIT |
 624                         SEC_ACE_FLAG_CONTAINER_INHERIT;
 625
 626                 if (afs_ace->type == SID_NAME_UNKNOWN) {
 627                         DEBUG(10, ("Ignoring unknown name %s\n",
 628                                    afs_ace->name));
 629                         afs_ace = afs_ace->next;
 630                         continue;
 631                 }
 632
 633                 if (S_ISDIR(psbuf->st_ex_mode))
 634                         afs_to_nt_dir_rights(afs_ace->rights, &nt_rights,
 635                                              &flag);
 636                 else
 637                         nt_rights = afs_to_nt_file_rights(afs_ace->rights);
 638
 639                 init_sec_ace(&nt_ace_list[good_aces++], &(afs_ace->sid),
 640                              SEC_ACE_TYPE_ACCESS_ALLOWED, nt_rights, flag);
 641                 afs_ace = afs_ace->next;
 642         }
 643
 644         psa = make_sec_acl(mem_ctx, NT4_ACL_REVISION,
 645                            good_aces, nt_ace_list);
 646         if (psa == NULL)
 647                 return 0;
 648
 649         *ppdesc = make_sec_desc(mem_ctx, SD_REVISION,
 650                                 SEC_DESC_SELF_RELATIVE,
 651                                 (security_info & SECINFO_OWNER)
 652                                 ? &owner_sid : NULL,
 653                                 (security_info & SECINFO_GROUP)
 654                                 ? &group_sid : NULL,
 655                                 NULL, psa, &sd_size);
 656
 657         return sd_size;
 658 }
 659
 660 static size_t afs_to_nt_acl(struct afs_acl *afs_acl,
 661                             struct connection_struct *conn,
 662                             struct smb_filename *smb_fname,
 663                             uint32_t security_info,
 664                              TALLOC_CTX *mem_ctx,
 665                             struct security_descriptor **ppdesc)
 666 {
 667         int ret;
 668
 669         /*
 670          * We can directly use SMB_VFS_STAT here, as if this was a
 671          * POSIX call on a symlink, we've already refused it.
 672          * For a Windows acl mapped call on a symlink, we want to follow
 673          * it.
 674          */
 675         /* Get the stat struct for the owner info. */
 676         ret = SMB_VFS_STAT(conn, smb_fname);
 677         if (ret == -1) {
 678                 return 0;
 679         }
 680
 681         return afs_to_nt_acl_common(afs_acl, &smb_fname->st, security_info,
 682                                     mem_ctx, ppdesc);
 683 }
 684
 685 static size_t afs_fto_nt_acl(struct afs_acl *afs_acl,
 686                              struct files_struct *fsp,
 687                              uint32_t security_info,
 688                              TALLOC_CTX *mem_ctx,
 689                              struct security_descriptor **ppdesc)
 690 {
 691         SMB_STRUCT_STAT sbuf;
 692
 693         if (fsp->fh->fd == -1) {
 694                 /* Get the stat struct for the owner info. */
 695                 return afs_to_nt_acl(afs_acl, fsp->conn, fsp->fsp_name,
 696                                      security_info, mem_ctx, ppdesc);
 697         }
 698
 699         if(SMB_VFS_FSTAT(fsp, &sbuf) != 0) {
 700                 return 0;
 701         }
 702
 703         return afs_to_nt_acl_common(afs_acl, &sbuf, security_info,
 704                                 mem_ctx, ppdesc);
 705 }
 706
 707 static bool mappable_sid(const struct dom_sid *sid)
 708 {
 709         struct dom_sid domain_sid;
 710
 711         if (dom_sid_compare(sid, &global_sid_Builtin_Administrators) == 0)
 712                 return true;
 713
 714         if (dom_sid_compare(sid, &global_sid_World) == 0)
 715                 return true;
 716
 717         if (dom_sid_compare(sid, &global_sid_Authenticated_Users) == 0)
 718                 return true;
 719
 720         if (dom_sid_compare(sid, &global_sid_Builtin_Backup_Operators) == 0)
 721                 return true;
 722
 723         string_to_sid(&domain_sid, "S-1-5-21");
 724
 725         if (sid_compare_domain(sid, &domain_sid) == 0)
 726                 return true;
 727
 728         return false;
 729 }
 730
 731 static bool nt_to_afs_acl(const char *filename,
 732                           uint32_t security_info_sent,
 733                           const struct security_descriptor *psd,
 734                           uint32_t (*nt_to_afs_rights)(const char *filename,
 735                                                      const struct security_ace *ace),
 736                           struct afs_acl *afs_acl)
 737 {
 738         const struct security_acl *dacl;
 739         int i;
 740
 741         /* Currently we *only* look at the dacl */
 742
 743         if (((security_info_sent & SECINFO_DACL) == 0) ||
 744             (psd->dacl == NULL))
 745                 return true;
 746
 747         if (!init_afs_acl(afs_acl))
 748                 return false;
 749
 750         dacl = psd->dacl;
 751
 752         for (i = 0; i < dacl->num_aces; i++) {
 753                 const struct security_ace *ace = &(dacl->aces[i]);
 754                 const char *dom_name, *name;
 755                 enum lsa_SidType name_type;
 756                 char *p;
 757
 758                 if (ace->type != SEC_ACE_TYPE_ACCESS_ALLOWED) {
 759                         /* First cut: Only positive ACEs */
 760                         return false;
 761                 }
 762
 763                 if (!mappable_sid(&ace->trustee)) {
 764                         struct dom_sid_buf buf;
 765                         DEBUG(10, ("Ignoring unmappable SID %s\n",
 766                                    dom_sid_str_buf(&ace->trustee, &buf)));
 767                         continue;
 768                 }
 769
 770                 if (dom_sid_compare(&ace->trustee,
 771                                 &global_sid_Builtin_Administrators) == 0) {
 772
 773                         name = "system:administrators";
 774
 775                 } else if (dom_sid_compare(&ace->trustee,
 776                                        &global_sid_World) == 0) {
 777
 778                         name = "system:anyuser";
 779
 780                 } else if (dom_sid_compare(&ace->trustee,
 781                                        &global_sid_Authenticated_Users) == 0) {
 782
 783                         name = "system:authuser";
 784
 785                 } else if (dom_sid_compare(&ace->trustee,
 786                                        &global_sid_Builtin_Backup_Operators)
 787                            == 0) {
 788
 789                         name = "system:backup";
 790
 791                 } else {
 792
 793                         if (!lookup_sid(talloc_tos(), &ace->trustee,
 794                                         &dom_name, &name, &name_type)) {
 795                                 struct dom_sid_buf buf;
 796                                 DEBUG(1, ("AFSACL: Could not lookup SID %s on file %s\n",
 797                                           dom_sid_str_buf(&ace->trustee, &buf),
 798                                           filename));
 799                                 continue;
 800                         }
 801
 802                         if ( (name_type == SID_NAME_USER) ||
 803                              (name_type == SID_NAME_DOM_GRP) ||
 804                              (name_type == SID_NAME_ALIAS) ) {
 805                                 char *tmp;
 806                                 tmp = talloc_asprintf(talloc_tos(), "%s%s%s",
 807                                                        dom_name, lp_winbind_separator(),
 808                                                        name);
 809                                 if (tmp == NULL) {
 810                                         return false;
 811                                 }
 812                                 if (!strlower_m(tmp)) {
 813                                         return false;
 814                                 }
 815                                 name = tmp;
 816                         }
 817
 818                         if (sidpts) {
 819                                 /* Expect all users/groups in pts as SIDs */
 820                                 name = talloc_strdup(
 821                                         talloc_tos(),
 822                                         sid_string_tos(&ace->trustee));
 823                                 if (name == NULL) {
 824                                         return false;
 825                                 }
 826                         }
 827                 }
 828
 829                 while ((p = strchr_m(name, ' ')) != NULL)
 830                         *p = space_replacement;
 831
 832                 add_afs_ace(afs_acl, true, name,
 833                             nt_to_afs_rights(filename, ace));
 834         }
 835
 836         return true;
 837 }
 838
 839 static bool afs_get_afs_acl(const char *filename, struct afs_acl *acl)
 840 {
 841         struct afs_iob iob;
 842
 843         int ret;
 844
 845         char space[MAXSIZE];
 846
 847         DEBUG(5, ("afs_get_afs_acl: %s\n", filename));
 848
 849         iob.in_size = 0;
 850         iob.out_size = MAXSIZE;
 851         iob.in = iob.out = space;
 852
 853         ret = afs_syscall(AFSCALL_PIOCTL, filename, VIOCGETAL,
 854                           (char *)&iob, 0);
 855
 856         if (ret) {
 857                 DEBUG(1, ("got error from PIOCTL: %d\n", ret));
 858                 return false;
 859         }
 860
 861         if (!init_afs_acl(acl))
 862                 return false;
 863
 864         if (!parse_afs_acl(acl, space)) {
 865                 DEBUG(1, ("Could not parse AFS acl\n"));
 866                 free_afs_acl(acl);
 867                 return false;
 868         }
 869
 870         return true;
 871 }
 872
 873 /* For setting an AFS ACL we have to take care of the ACEs we could
 874  * not properly map to SIDs. Merge all of them into the new ACL. */
 875
 876 static void merge_unknown_aces(struct afs_acl *src, struct afs_acl *dst)
 877 {
 878         struct afs_ace *ace;
 879
 880         for (ace = src->acelist; ace != NULL; ace = ace->next)
 881         {
 882                 struct afs_ace *copy;
 883
 884                 if (ace->type != SID_NAME_UNKNOWN) {
 885                         DEBUG(10, ("Not merging known ACE for %s\n",
 886                                    ace->name));
 887                         continue;
 888                 }
 889
 890                 DEBUG(10, ("Merging unknown ACE for %s\n", ace->name));
 891
 892                 copy = clone_afs_ace(dst->ctx, ace);
 893
 894                 if (copy == NULL) {
 895                         DEBUG(0, ("Could not clone ACE for %s\n", ace->name));
 896                         continue;
 897                 }
 898
 899                 copy->next = dst->acelist;
 900                 dst->acelist = copy;
 901                 dst->num_aces += 1;
 902         }
 903 }
 904
 905 static NTSTATUS afs_set_nt_acl(vfs_handle_struct *handle, files_struct *fsp,
 906                            uint32_t security_info_sent,
 907                            const struct security_descriptor *psd)
 908 {
 909         struct afs_acl old_afs_acl, new_afs_acl;
 910         struct afs_acl dir_acl, file_acl;
 911         char acl_string[MAXSIZE];
 912         struct afs_iob iob;
 913         int ret = -1;
 914         char *name = NULL;
 915         const char *fileacls;
 916
 917         fileacls = lp_parm_const_string(SNUM(handle->conn), "afsacl", "fileacls",
 918                                         "yes");
 919
 920         sidpts = lp_parm_bool(SNUM(handle->conn), "afsacl", "sidpts", false);
 921
 922         ZERO_STRUCT(old_afs_acl);
 923         ZERO_STRUCT(new_afs_acl);
 924         ZERO_STRUCT(dir_acl);
 925         ZERO_STRUCT(file_acl);
 926
 927         name = talloc_strdup(talloc_tos(), fsp->fsp_name->base_name);
 928         if (!name) {
 929                 return NT_STATUS_NO_MEMORY;
 930         }
 931
 932         if (!fsp->is_directory) {
 933                 /* We need to get the name of the directory containing the
 934                  * file, this is where the AFS acls live */
 935                 char *p = strrchr(name, '/');
 936                 if (p != NULL) {
 937                         *p = '\0';
 938                 } else {
 939                         name = talloc_strdup(talloc_tos(), ".");
 940                         if (!name) {
 941                                 return NT_STATUS_NO_MEMORY;
 942                         }
 943                 }
 944         }
 945
 946         if (!afs_get_afs_acl(name, &old_afs_acl)) {
 947                 DEBUG(3, ("Could not get old ACL of %s\n", fsp_str_dbg(fsp)));
 948                 goto done;
 949         }
 950
 951         split_afs_acl(&old_afs_acl, &dir_acl, &file_acl);
 952
 953         if (fsp->is_directory) {
 954
 955                 if (!strequal(fileacls, "yes")) {
 956                         /* Throw away file acls, we depend on the
 957                          * inheritance ACEs that also give us file
 958                          * permissions */
 959                         free_afs_acl(&file_acl);
 960                 }
 961
 962                 free_afs_acl(&dir_acl);
 963                 if (!nt_to_afs_acl(fsp->fsp_name->base_name,
 964                                    security_info_sent, psd,
 965                                    nt_to_afs_dir_rights, &dir_acl))
 966                         goto done;
 967         } else {
 968                 if (strequal(fileacls, "no")) {
 969                         ret = -1;
 970                         goto done;
 971                 }
 972
 973                 if (strequal(fileacls, "ignore")) {
 974                         ret = 0;
 975                         goto done;
 976                 }
 977
 978                 free_afs_acl(&file_acl);
 979                 if (!nt_to_afs_acl(fsp->fsp_name->base_name,
 980                                    security_info_sent, psd,
 981                                    nt_to_afs_file_rights, &file_acl))
 982                         goto done;
 983         }
 984
 985         merge_afs_acls(&dir_acl, &file_acl, &new_afs_acl);
 986
 987         merge_unknown_aces(&old_afs_acl, &new_afs_acl);
 988
 989         unparse_afs_acl(&new_afs_acl, acl_string);
 990
 991         iob.in = acl_string;
 992         iob.in_size = 1+strlen(iob.in);
 993         iob.out = NULL;
 994         iob.out_size = 0;
 995
 996         DEBUG(10, ("trying to set acl '%s' on file %s\n", iob.in, name));
 997
 998         ret = afs_syscall(AFSCALL_PIOCTL, name, VIOCSETAL, (char *)&iob, 0);
 999
1000         if (ret != 0) {
1001                 DEBUG(10, ("VIOCSETAL returned %d\n", ret));
1002         }
1003
1004  done:
1005         free_afs_acl(&dir_acl);
1006         free_afs_acl(&file_acl);
1007         free_afs_acl(&old_afs_acl);
1008         free_afs_acl(&new_afs_acl);
1009
1010         return (ret == 0) ? NT_STATUS_OK : NT_STATUS_ACCESS_DENIED;
1011 }
1012
1013 static NTSTATUS afsacl_fget_nt_acl(struct vfs_handle_struct *handle,
1014                                    struct files_struct *fsp,
1015                                    uint32_t security_info,
1016                                    TALLOC_CTX *mem_ctx,
1017                                    struct security_descriptor **ppdesc)
1018 {
1019         struct afs_acl acl;
1020         size_t sd_size;
1021
1022         DEBUG(5, ("afsacl_fget_nt_acl: %s\n", fsp_str_dbg(fsp)));
1023
1024         sidpts = lp_parm_bool(SNUM(fsp->conn), "afsacl", "sidpts", false);
1025
1026         if (!afs_get_afs_acl(fsp->fsp_name->base_name, &acl)) {
1027                 return NT_STATUS_ACCESS_DENIED;
1028         }
1029
1030         sd_size = afs_fto_nt_acl(&acl, fsp, security_info, mem_ctx, ppdesc);
1031
1032         free_afs_acl(&acl);
1033
1034         return (sd_size != 0) ? NT_STATUS_OK : NT_STATUS_ACCESS_DENIED;
1035 }
1036
1037 static NTSTATUS afsacl_get_nt_acl(struct vfs_handle_struct *handle,
1038                                 const struct smb_filename *smb_fname,
1039                                 uint32_t security_info,
1040                                 TALLOC_CTX *mem_ctx,
1041                                 struct security_descriptor **ppdesc)
1042 {
1043         struct afs_acl acl;
1044         size_t sd_size;
1045
1046         DEBUG(5, ("afsacl_get_nt_acl: %s\n", smb_fname->base_name));
1047
1048         sidpts = lp_parm_bool(SNUM(handle->conn), "afsacl", "sidpts", false);
1049
1050         if (!afs_get_afs_acl(smb_fname->base_name, &acl)) {
1051                 return NT_STATUS_ACCESS_DENIED;
1052         }
1053
1054         sd_size = afs_to_nt_acl(&acl, handle->conn, smb_fname, security_info,
1055                                 mem_ctx, ppdesc);
1056
1057         free_afs_acl(&acl);
1058
1059         return (sd_size != 0) ? NT_STATUS_OK : NT_STATUS_ACCESS_DENIED;
1060 }
1061
1062 static NTSTATUS afsacl_fset_nt_acl(vfs_handle_struct *handle,
1063                          files_struct *fsp,
1064                          uint32_t security_info_sent,
1065                          const struct security_descriptor *psd)
1066 {
1067         return afs_set_nt_acl(handle, fsp, security_info_sent, psd);
1068 }
1069
1070 static int afsacl_connect(vfs_handle_struct *handle,
1071                           const char *service,
1072                           const char *user)
1073 {
1074         const char *spc;
1075         int ret = SMB_VFS_NEXT_CONNECT(handle, service, user);
1076
1077         if (ret < 0) {
1078                 return ret;
1079         }
1080
1081         spc = lp_parm_const_string(SNUM(handle->conn), "afsacl", "space", "%");
1082
1083         if (spc != NULL)
1084                 space_replacement = spc[0];
1085
1086         return 0;
1087 }
1088
1089 /* We don't have a linear form of the AFS ACL yet */
1090 static int afsacl_sys_acl_blob_get_file(vfs_handle_struct *handle,
1091                         const struct smb_filename *smb_fname,
1092                         TALLOC_CTX *mem_ctx,
1093                         char **blob_description,
1094                         DATA_BLOB *blob)
1095 {
1096         errno = ENOSYS;
1097         return -1;
1098 }
1099
1100 /* We don't have a linear form of the AFS ACL yet */
1101 static int afsacl_sys_acl_blob_get_fd(vfs_handle_struct *handle, files_struct *fsp, TALLOC_CTX *mem_ctx, char **blob_description, DATA_BLOB *blob)
1102 {
1103         errno = ENOSYS;
1104         return -1;
1105 }
1106
1107 static struct vfs_fn_pointers vfs_afsacl_fns = {
1108         .connect_fn = afsacl_connect,
1109         .fget_nt_acl_fn = afsacl_fget_nt_acl,
1110         .get_nt_acl_fn = afsacl_get_nt_acl,
1111         .fset_nt_acl_fn = afsacl_fset_nt_acl,
1112         .sys_acl_blob_get_file_fn = afsacl_sys_acl_blob_get_file,
1113         .sys_acl_blob_get_fd_fn = afsacl_sys_acl_blob_get_fd
1114 };
1115
1116 static_decl_vfs;
1117 NTSTATUS vfs_afsacl_init(TALLOC_CTX *ctx)
1118 {
1119         return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "afsacl",
1120                                 &vfs_afsacl_fns);
1121 }