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 #include "lib/util/string_wrappers.h"
  29
  30 #undef DBGC_CLASS
  31 #define DBGC_CLASS DBGC_VFS
  32
  33 #include <afs/stds.h>
  34 #include <afs/afs_args.h>
  35 #include <afs/venus.h>
  36 #include <afs/prs_fs.h>
  37
  38 #define MAXSIZE 2049
  39
  40 extern const struct dom_sid global_sid_World;
  41 extern const struct dom_sid global_sid_Builtin_Administrators;
  42 extern const struct dom_sid global_sid_Builtin_Backup_Operators;
  43 extern const struct dom_sid global_sid_Authenticated_Users;
  44 extern const struct dom_sid global_sid_NULL;
  45
  46 static char space_replacement = '%';
  47
  48 /* Do we expect SIDs as pts names? */
  49 static bool sidpts;
  50
  51 struct afs_ace {
  52         bool positive;
  53         char *name;
  54         struct dom_sid sid;
  55         enum lsa_SidType type;
  56         uint32_t rights;
  57         struct afs_ace *next;
  58 };
  59
  60 struct afs_acl {
  61         TALLOC_CTX *ctx;
  62         int type;
  63         int num_aces;
  64         struct afs_ace *acelist;
  65 };
  66
  67 struct afs_iob {
  68         char *in, *out;
  69         uint16_t in_size, out_size;
  70 };
  71
  72
  73 static bool init_afs_acl(struct afs_acl *acl)
  74 {
  75         ZERO_STRUCT(*acl);
  76         acl->ctx = talloc_init("afs_acl");
  77         if (acl->ctx == NULL) {
  78                 DEBUG(10, ("Could not init afs_acl\n"));
  79                 return false;
  80         }
  81         return true;
  82 }
  83
  84 static void free_afs_acl(struct afs_acl *acl)
  85 {
  86         if (acl->ctx != NULL)
  87                 talloc_destroy(acl->ctx);
  88         acl->ctx = NULL;
  89         acl->num_aces = 0;
  90         acl->acelist = NULL;
  91 }
  92
  93 static struct afs_ace *clone_afs_ace(TALLOC_CTX *mem_ctx, struct afs_ace *ace)
  94 {
  95         struct afs_ace *result = talloc(mem_ctx, struct afs_ace);
  96
  97         if (result == NULL)
  98                 return NULL;
  99
 100         *result = *ace;
 101
 102         result->next = NULL;
 103         result->name = talloc_strdup(mem_ctx, ace->name);
 104
 105         if (result->name == NULL) {
 106                 return NULL;
 107         }
 108
 109         return result;
 110 }
 111
 112 static struct afs_ace *new_afs_ace(TALLOC_CTX *mem_ctx,
 113                                    bool positive,
 114                                    const char *name, uint32_t rights)
 115 {
 116         struct dom_sid sid;
 117         enum lsa_SidType type;
 118         struct afs_ace *result;
 119
 120         if (strcmp(name, "system:administrators") == 0) {
 121
 122                 sid_copy(&sid, &global_sid_Builtin_Administrators);
 123                 type = SID_NAME_ALIAS;
 124
 125         } else if (strcmp(name, "system:anyuser") == 0) {
 126
 127                 sid_copy(&sid, &global_sid_World);
 128                 type = SID_NAME_ALIAS;
 129
 130         } else if (strcmp(name, "system:authuser") == 0) {
 131
 132                 sid_copy(&sid, &global_sid_Authenticated_Users);
 133                 type = SID_NAME_WKN_GRP;
 134
 135         } else if (strcmp(name, "system:backup") == 0) {
 136
 137                 sid_copy(&sid, &global_sid_Builtin_Backup_Operators);
 138                 type = SID_NAME_ALIAS;
 139
 140         } else if (sidpts) {
 141                 /* All PTS users/groups are expressed as SIDs */
 142
 143                 sid_copy(&sid, &global_sid_NULL);
 144                 type = SID_NAME_UNKNOWN;
 145
 146                 if (string_to_sid(&sid, name)) {
 147                         const char *user, *domain;
 148                         /* We have to find the type, look up the SID */
 149                         lookup_sid(talloc_tos(), &sid,
 150                                    &domain, &user, &type);
 151                 }
 152
 153         } else {
 154
 155                 const char *domain, *uname;
 156                 char *p;
 157
 158                 p = strchr_m(name, *lp_winbind_separator());
 159                 if (p != NULL) {
 160                         *p = '\\';
 161                 }
 162
 163                 if (!lookup_name(talloc_tos(), name, LOOKUP_NAME_ALL,
 164                                  &domain, &uname, &sid, &type)) {
 165                         DEBUG(10, ("Could not find AFS user %s\n", name));
 166
 167                         sid_copy(&sid, &global_sid_NULL);
 168                         type = SID_NAME_UNKNOWN;
 169
 170                 }
 171         }
 172
 173         result = talloc(mem_ctx, struct afs_ace);
 174
 175         if (result == NULL) {
 176                 DEBUG(0, ("Could not talloc AFS ace\n"));
 177                 return NULL;
 178         }
 179
 180         result->name = talloc_strdup(mem_ctx, name);
 181         if (result->name == NULL) {
 182                 DEBUG(0, ("Could not talloc AFS ace name\n"));
 183                 return NULL;
 184         }
 185
 186         result->sid = sid;
 187         result->type = type;
 188
 189         result->positive = positive;
 190         result->rights = rights;
 191
 192         return result;
 193 }
 194
 195 static void add_afs_ace(struct afs_acl *acl,
 196                         bool positive,
 197                         const char *name, uint32_t rights)
 198 {
 199         struct afs_ace *ace;
 200
 201         for (ace = acl->acelist; ace != NULL; ace = ace->next) {
 202                 if ((ace->positive == positive) &&
 203                     (strequal(ace->name, name))) {
 204                         ace->rights |= rights;
 205                         return;
 206                 }
 207         }
 208
 209         ace = new_afs_ace(acl->ctx, positive, name, rights);
 210
 211         ace->next = acl->acelist;
 212         acl->acelist = ace;
 213
 214         acl->num_aces += 1;
 215
 216         DEBUG(10, ("add_afs_ace: Added %s entry for %s with rights %d\n",
 217                    ace->positive?"positive":"negative",
 218                    ace->name, ace->rights));
 219 }
 220
 221 /* AFS ACLs in string form are a long string of fields delimited with \n.
 222  *
 223  * First line:  Number of positive entries
 224  * Second line: Number of negative entries
 225  * Third and following lines: The entries themselves
 226  *
 227  * An ACE is a line of two fields, delimited by \t.
 228  *
 229  * First field:  Name
 230  * Second field: Rights
 231  */
 232
 233 static bool parse_afs_acl(struct afs_acl *acl, const char *acl_str)
 234 {
 235         int nplus, nminus;
 236         int aces;
 237
 238         char str[MAXSIZE];
 239         char *p = str;
 240
 241         strlcpy(str, acl_str, MAXSIZE);
 242
 243         if (sscanf(p, "%d", &nplus) != 1)
 244                 return false;
 245
 246         DEBUG(10, ("Found %d positive entries\n", nplus));
 247
 248         if ((p = strchr(p, '\n')) == NULL)
 249                 return false;
 250         p += 1;
 251
 252         if (sscanf(p, "%d", &nminus) != 1)
 253                 return false;
 254
 255         DEBUG(10, ("Found %d negative entries\n", nminus));
 256
 257         if ((p = strchr(p, '\n')) == NULL)
 258                 return false;
 259         p += 1;
 260
 261         for (aces = nplus+nminus; aces > 0; aces--)
 262         {
 263
 264                 const char *namep;
 265                 fstring name;
 266                 uint32_t rights;
 267                 char *space;
 268
 269                 namep = p;
 270
 271                 if ((p = strchr(p, '\t')) == NULL)
 272                         return false;
 273                 *p = '\0';
 274                 p += 1;
 275
 276                 if (sscanf(p, "%d", &rights) != 1)
 277                         return false;
 278
 279                 if ((p = strchr(p, '\n')) == NULL)
 280                         return false;
 281                 p += 1;
 282
 283                 fstrcpy(name, namep);
 284
 285                 while ((space = strchr_m(name, space_replacement)) != NULL)
 286                         *space = ' ';
 287
 288                 add_afs_ace(acl, nplus>0, name, rights);
 289
 290                 nplus -= 1;
 291         }
 292
 293         return true;
 294 }
 295
 296 static bool unparse_afs_acl(struct afs_acl *acl, char *acl_str)
 297 {
 298         /* TODO: String length checks!!!! */
 299
 300         int positives = 0;
 301         int negatives = 0;
 302         fstring line;
 303         struct afs_ace *ace = acl->acelist;
 304
 305         *acl_str = 0;
 306
 307         while (ace != NULL) {
 308                 if (ace->positive)
 309                         positives++;
 310                 else
 311                         negatives++;
 312                 ace = ace->next;
 313         }
 314
 315         fstr_sprintf(line, "%d\n", positives);
 316         if (strlcat(acl_str, line, MAXSIZE) >= MAXSIZE) {
 317                 return false;
 318         }
 319
 320         fstr_sprintf(line, "%d\n", negatives);
 321         if (strlcat(acl_str, line, MAXSIZE) >= MAXSIZE) {
 322                 return false;
 323         }
 324
 325         ace = acl->acelist;
 326
 327         while (ace != NULL) {
 328                 fstr_sprintf(line, "%s\t%d\n", ace->name, ace->rights);
 329                 if (strlcat(acl_str, line, MAXSIZE) >= MAXSIZE) {
 330                         return false;
 331                 }
 332                 ace = ace->next;
 333         }
 334         return true;
 335 }
 336
 337 static uint32_t afs_to_nt_file_rights(uint32_t rights)
 338 {
 339         uint32_t result = 0;
 340
 341         if (rights & PRSFS_READ)
 342                 result |= FILE_READ_DATA | FILE_READ_EA |
 343                         FILE_EXECUTE | FILE_READ_ATTRIBUTES |
 344                         READ_CONTROL_ACCESS | SYNCHRONIZE_ACCESS;
 345
 346         if (rights & PRSFS_WRITE)
 347                 result |= FILE_WRITE_DATA | FILE_WRITE_ATTRIBUTES |
 348                         FILE_WRITE_EA | FILE_APPEND_DATA;
 349
 350         if (rights & PRSFS_LOCK)
 351                 result |= WRITE_OWNER_ACCESS;
 352
 353         if (rights & PRSFS_DELETE)
 354                 result |= DELETE_ACCESS;
 355
 356         return result;
 357 }
 358
 359 static void afs_to_nt_dir_rights(uint32_t afs_rights, uint32_t *nt_rights,
 360                                  uint8_t *flag)
 361 {
 362         *nt_rights = 0;
 363         *flag = SEC_ACE_FLAG_OBJECT_INHERIT |
 364                 SEC_ACE_FLAG_CONTAINER_INHERIT;
 365
 366         if (afs_rights & PRSFS_INSERT)
 367                 *nt_rights |= FILE_ADD_FILE | FILE_ADD_SUBDIRECTORY;
 368
 369         if (afs_rights & PRSFS_LOOKUP)
 370                 *nt_rights |= FILE_READ_DATA | FILE_READ_EA |
 371                         FILE_EXECUTE | FILE_READ_ATTRIBUTES |
 372                         READ_CONTROL_ACCESS | SYNCHRONIZE_ACCESS;
 373
 374         if (afs_rights & PRSFS_WRITE)
 375                 *nt_rights |= FILE_WRITE_ATTRIBUTES | FILE_WRITE_DATA |
 376                         FILE_APPEND_DATA | FILE_WRITE_EA;
 377
 378         if ((afs_rights & (PRSFS_INSERT|PRSFS_LOOKUP|PRSFS_DELETE)) ==
 379             (PRSFS_INSERT|PRSFS_LOOKUP|PRSFS_DELETE))
 380                 *nt_rights |= FILE_WRITE_ATTRIBUTES | FILE_WRITE_EA |
 381                         GENERIC_WRITE_ACCESS;
 382
 383         if (afs_rights & PRSFS_DELETE)
 384                 *nt_rights |= DELETE_ACCESS;
 385
 386         if (afs_rights & PRSFS_ADMINISTER)
 387                 *nt_rights |= FILE_DELETE_CHILD | WRITE_DAC_ACCESS |
 388                         WRITE_OWNER_ACCESS;
 389
 390         if ( (afs_rights & PRSFS_LOOKUP) ==
 391              (afs_rights & (PRSFS_LOOKUP|PRSFS_READ)) ) {
 392                 /* Only lookup right */
 393                 *flag = SEC_ACE_FLAG_CONTAINER_INHERIT;
 394         }
 395 }
 396
 397 #define AFS_FILE_RIGHTS (PRSFS_READ|PRSFS_WRITE|PRSFS_LOCK)
 398 #define AFS_DIR_RIGHTS  (PRSFS_INSERT|PRSFS_LOOKUP|PRSFS_DELETE|PRSFS_ADMINISTER)
 399
 400 static void split_afs_acl(struct afs_acl *acl,
 401                           struct afs_acl *dir_acl,
 402                           struct afs_acl *file_acl)
 403 {
 404         struct afs_ace *ace;
 405
 406         init_afs_acl(dir_acl);
 407         init_afs_acl(file_acl);
 408
 409         for (ace = acl->acelist; ace != NULL; ace = ace->next) {
 410                 if (ace->rights & AFS_FILE_RIGHTS) {
 411                         add_afs_ace(file_acl, ace->positive, ace->name,
 412                                     ace->rights & AFS_FILE_RIGHTS);
 413                 }
 414
 415                 if (ace->rights & AFS_DIR_RIGHTS) {
 416                         add_afs_ace(dir_acl, ace->positive, ace->name,
 417                                     ace->rights & AFS_DIR_RIGHTS);
 418                 }
 419         }
 420 }
 421
 422 static bool same_principal(struct afs_ace *x, struct afs_ace *y)
 423 {
 424         return ( (x->positive == y->positive) &&
 425                  (dom_sid_compare(&x->sid, &y->sid) == 0) );
 426 }
 427
 428 static void merge_afs_acls(struct afs_acl *dir_acl,
 429                            struct afs_acl *file_acl,
 430                            struct afs_acl *target)
 431 {
 432         struct afs_ace *ace;
 433
 434         init_afs_acl(target);
 435
 436         for (ace = dir_acl->acelist; ace != NULL; ace = ace->next) {
 437                 struct afs_ace *file_ace;
 438                 bool found = false;
 439
 440                 for (file_ace = file_acl->acelist;
 441                      file_ace != NULL;
 442                      file_ace = file_ace->next) {
 443                         if (!same_principal(ace, file_ace))
 444                                 continue;
 445
 446                         add_afs_ace(target, ace->positive, ace->name,
 447                                     ace->rights | file_ace->rights);
 448                         found = true;
 449                         break;
 450                 }
 451                 if (!found)
 452                         add_afs_ace(target, ace->positive, ace->name,
 453                                     ace->rights);
 454         }
 455
 456         for (ace = file_acl->acelist; ace != NULL; ace = ace->next) {
 457                 struct afs_ace *dir_ace;
 458                 bool already_seen = false;
 459
 460                 for (dir_ace = dir_acl->acelist;
 461                      dir_ace != NULL;
 462                      dir_ace = dir_ace->next) {
 463                         if (!same_principal(ace, dir_ace))
 464                                 continue;
 465                         already_seen = true;
 466                         break;
 467                 }
 468                 if (!already_seen)
 469                         add_afs_ace(target, ace->positive, ace->name,
 470                                     ace->rights);
 471         }
 472 }
 473
 474 #define PERMS_READ   0x001200a9
 475 #define PERMS_CHANGE 0x001301bf
 476 #define PERMS_FULL   0x001f01ff
 477
 478 static struct static_dir_ace_mapping {
 479         uint8_t type;
 480         uint8_t flags;
 481         uint32_t mask;
 482         uint32_t afs_rights;
 483 } ace_mappings[] = {
 484
 485         /* Full control */
 486         { 0, SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT,
 487           PERMS_FULL, 127 /* rlidwka */ },
 488
 489         /* Change (write) */
 490         { 0, SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT,
 491           PERMS_CHANGE, 63 /* rlidwk */ },
 492
 493         /* Read (including list folder content) */
 494         { 0, SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT,
 495           PERMS_READ, 9 /* rl */ },
 496
 497         /* Read without list folder content -- same as "l" */
 498         { 0, SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT,
 499           0x00120089, 8 /* l */ },
 500
 501         /* some stupid workaround for preventing fallbacks */
 502         { 0, 0x3, 0x0012019F, 9 /* rl */ },
 503         { 0, 0x13, PERMS_FULL, 127 /* full */ },
 504
 505         /* read, delete and execute access plus synchronize */
 506         { 0, 0x3, 0x001300A9, 9 /* should be rdl, set to rl */},
 507         /* classical read list */
 508         { 0, 0x13, 0x001200A9, 9 /* rl */},
 509         /* almost full control, no delete */
 510         { 0, 0x13, PERMS_CHANGE, 63 /* rwidlk */},
 511
 512         /* List folder */
 513         { 0, SEC_ACE_FLAG_CONTAINER_INHERIT,
 514           PERMS_READ, 8 /* l */ },
 515
 516         /* FULL without inheritance -- in all cases here we also get
 517            the corresponding INHERIT_ONLY ACE in the same ACL */
 518         { 0, 0, PERMS_FULL, 127 /* rlidwka */ },
 519
 520         /* FULL inherit only -- counterpart to previous one */
 521         { 0, SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_INHERIT_ONLY,
 522           PERMS_FULL | SEC_GENERIC_WRITE, 127 /* rlidwka */ },
 523
 524         /* CHANGE without inheritance -- in all cases here we also get
 525            the corresponding INHERIT_ONLY ACE in the same ACL */
 526         { 0, 0, PERMS_CHANGE, 63 /* rlidwk */ },
 527
 528         /* CHANGE inherit only -- counterpart to previous one */
 529         { 0, SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_INHERIT_ONLY,
 530           PERMS_CHANGE | SEC_GENERIC_WRITE, 63 /* rlidwk */ },
 531
 532         /* End marker, hopefully there's no afs right 9999 :-) */
 533         { 0, 0, 0, 9999 }
 534 };
 535
 536 static uint32_t nt_to_afs_dir_rights(const char *filename, const struct security_ace *ace)
 537 {
 538         uint32_t result = 0;
 539         uint32_t rights = ace->access_mask;
 540         uint8_t flags = ace->flags;
 541
 542         struct static_dir_ace_mapping *m;
 543
 544         for (m = &ace_mappings[0]; m->afs_rights != 9999; m++) {
 545                 if ( (ace->type == m->type) &&
 546                      (ace->flags == m->flags) &&
 547                      (ace->access_mask == m->mask) )
 548                         return m->afs_rights;
 549         }
 550
 551         DEBUG(1, ("AFSACL FALLBACK: 0x%X 0x%X 0x%X %s %X\n",
 552                   ace->type, ace->flags, ace->access_mask, filename, rights));
 553
 554         if (rights & (GENERIC_ALL_ACCESS|WRITE_DAC_ACCESS)) {
 555                 result |= PRSFS_READ | PRSFS_WRITE | PRSFS_INSERT |
 556                         PRSFS_LOOKUP | PRSFS_DELETE | PRSFS_LOCK |
 557                         PRSFS_ADMINISTER;
 558         }
 559
 560         if (rights & (GENERIC_READ_ACCESS|FILE_READ_DATA)) {
 561                 result |= PRSFS_LOOKUP;
 562                 if (flags & SEC_ACE_FLAG_OBJECT_INHERIT) {
 563                         result |= PRSFS_READ;
 564                 }
 565         }
 566
 567         if (rights & (GENERIC_WRITE_ACCESS|FILE_WRITE_DATA)) {
 568                 result |= PRSFS_INSERT | PRSFS_DELETE;
 569                 if (flags & SEC_ACE_FLAG_OBJECT_INHERIT) {
 570                         result |= PRSFS_WRITE | PRSFS_LOCK;
 571                 }
 572         }
 573
 574         return result;
 575 }
 576
 577 static uint32_t nt_to_afs_file_rights(const char *filename, const struct security_ace *ace)
 578 {
 579         uint32_t result = 0;
 580         uint32_t rights = ace->access_mask;
 581
 582         if (rights & (GENERIC_READ_ACCESS|FILE_READ_DATA)) {
 583                 result |= PRSFS_READ;
 584         }
 585
 586         if (rights & (GENERIC_WRITE_ACCESS|FILE_WRITE_DATA)) {
 587                 result |= PRSFS_WRITE | PRSFS_LOCK;
 588         }
 589
 590         return result;
 591 }
 592
 593 static size_t afs_to_nt_acl_common(struct afs_acl *afs_acl,
 594                                    SMB_STRUCT_STAT *psbuf,
 595                                    uint32_t security_info,
 596                                    TALLOC_CTX *mem_ctx,
 597                                    struct security_descriptor **ppdesc)
 598 {
 599         struct security_ace *nt_ace_list;
 600         struct dom_sid owner_sid, group_sid;
 601         struct security_acl *psa = NULL;
 602         int good_aces;
 603         size_t sd_size;
 604
 605         struct afs_ace *afs_ace;
 606
 607         uid_to_sid(&owner_sid, psbuf->st_ex_uid);
 608         gid_to_sid(&group_sid, psbuf->st_ex_gid);
 609
 610         if (afs_acl->num_aces) {
 611                 nt_ace_list = talloc_array(mem_ctx, struct security_ace, afs_acl->num_aces);
 612
 613                 if (nt_ace_list == NULL)
 614                         return 0;
 615         } else {
 616                 nt_ace_list = NULL;
 617         }
 618
 619         afs_ace = afs_acl->acelist;
 620         good_aces = 0;
 621
 622         while (afs_ace != NULL) {
 623                 uint32_t nt_rights;
 624                 uint8_t flag = SEC_ACE_FLAG_OBJECT_INHERIT |
 625                         SEC_ACE_FLAG_CONTAINER_INHERIT;
 626
 627                 if (afs_ace->type == SID_NAME_UNKNOWN) {
 628                         DEBUG(10, ("Ignoring unknown name %s\n",
 629                                    afs_ace->name));
 630                         afs_ace = afs_ace->next;
 631                         continue;
 632                 }
 633
 634                 if (S_ISDIR(psbuf->st_ex_mode))
 635                         afs_to_nt_dir_rights(afs_ace->rights, &nt_rights,
 636                                              &flag);
 637                 else
 638                         nt_rights = afs_to_nt_file_rights(afs_ace->rights);
 639
 640                 init_sec_ace(&nt_ace_list[good_aces++], &(afs_ace->sid),
 641                              SEC_ACE_TYPE_ACCESS_ALLOWED, nt_rights, flag);
 642                 afs_ace = afs_ace->next;
 643         }
 644
 645         psa = make_sec_acl(mem_ctx, NT4_ACL_REVISION,
 646                            good_aces, nt_ace_list);
 647         if (psa == NULL)
 648                 return 0;
 649
 650         *ppdesc = make_sec_desc(mem_ctx, SD_REVISION,
 651                                 SEC_DESC_SELF_RELATIVE,
 652                                 (security_info & SECINFO_OWNER)
 653                                 ? &owner_sid : NULL,
 654                                 (security_info & SECINFO_GROUP)
 655                                 ? &group_sid : NULL,
 656                                 NULL, psa, &sd_size);
 657
 658         return sd_size;
 659 }
 660
 661 static size_t afs_to_nt_acl(struct afs_acl *afs_acl,
 662                             struct connection_struct *conn,
 663                             struct smb_filename *smb_fname,
 664                             uint32_t security_info,
 665                              TALLOC_CTX *mem_ctx,
 666                             struct security_descriptor **ppdesc)
 667 {
 668         int ret;
 669
 670         /*
 671          * We can directly use SMB_VFS_STAT here, as if this was a
 672          * POSIX call on a symlink, we've already refused it.
 673          * For a Windows acl mapped call on a symlink, we want to follow
 674          * it.
 675          */
 676         /* Get the stat struct for the owner info. */
 677         ret = SMB_VFS_STAT(conn, smb_fname);
 678         if (ret == -1) {
 679                 return 0;
 680         }
 681
 682         return afs_to_nt_acl_common(afs_acl, &smb_fname->st, security_info,
 683                                     mem_ctx, ppdesc);
 684 }
 685
 686 static size_t afs_fto_nt_acl(struct afs_acl *afs_acl,
 687                              struct files_struct *fsp,
 688                              uint32_t security_info,
 689                              TALLOC_CTX *mem_ctx,
 690                              struct security_descriptor **ppdesc)
 691 {
 692         SMB_STRUCT_STAT sbuf;
 693
 694         if (fsp_get_pathref_fd(fsp) == -1) {
 695                 /* Get the stat struct for the owner info. */
 696                 return afs_to_nt_acl(afs_acl, fsp->conn, fsp->fsp_name,
 697                                      security_info, mem_ctx, ppdesc);
 698         }
 699
 700         if(SMB_VFS_FSTAT(fsp, &sbuf) != 0) {
 701                 return 0;
 702         }
 703
 704         return afs_to_nt_acl_common(afs_acl, &sbuf, security_info,
 705                                 mem_ctx, ppdesc);
 706 }
 707
 708 static bool mappable_sid(const struct dom_sid *sid)
 709 {
 710         struct dom_sid domain_sid;
 711
 712         if (dom_sid_compare(sid, &global_sid_Builtin_Administrators) == 0)
 713                 return true;
 714
 715         if (dom_sid_compare(sid, &global_sid_World) == 0)
 716                 return true;
 717
 718         if (dom_sid_compare(sid, &global_sid_Authenticated_Users) == 0)
 719                 return true;
 720
 721         if (dom_sid_compare(sid, &global_sid_Builtin_Backup_Operators) == 0)
 722                 return true;
 723
 724         string_to_sid(&domain_sid, "S-1-5-21");
 725
 726         if (dom_sid_compare_domain(sid, &domain_sid) == 0)
 727                 return true;
 728
 729         return false;
 730 }
 731
 732 static bool nt_to_afs_acl(const char *filename,
 733                           uint32_t security_info_sent,
 734                           const struct security_descriptor *psd,
 735                           uint32_t (*nt_to_afs_rights)(const char *filename,
 736                                                      const struct security_ace *ace),
 737                           struct afs_acl *afs_acl)
 738 {
 739         const struct security_acl *dacl;
 740         int i;
 741
 742         /* Currently we *only* look at the dacl */
 743
 744         if (((security_info_sent & SECINFO_DACL) == 0) ||
 745             (psd->dacl == NULL))
 746                 return true;
 747
 748         if (!init_afs_acl(afs_acl))
 749                 return false;
 750
 751         dacl = psd->dacl;
 752
 753         for (i = 0; i < dacl->num_aces; i++) {
 754                 const struct security_ace *ace = &(dacl->aces[i]);
 755                 const char *dom_name, *name;
 756                 enum lsa_SidType name_type;
 757                 char *p;
 758
 759                 if (ace->type != SEC_ACE_TYPE_ACCESS_ALLOWED) {
 760                         /* First cut: Only positive ACEs */
 761                         return false;
 762                 }
 763
 764                 if (!mappable_sid(&ace->trustee)) {
 765                         struct dom_sid_buf buf;
 766                         DEBUG(10, ("Ignoring unmappable SID %s\n",
 767                                    dom_sid_str_buf(&ace->trustee, &buf)));
 768                         continue;
 769                 }
 770
 771                 if (dom_sid_compare(&ace->trustee,
 772                                 &global_sid_Builtin_Administrators) == 0) {
 773
 774                         name = "system:administrators";
 775
 776                 } else if (dom_sid_compare(&ace->trustee,
 777                                        &global_sid_World) == 0) {
 778
 779                         name = "system:anyuser";
 780
 781                 } else if (dom_sid_compare(&ace->trustee,
 782                                        &global_sid_Authenticated_Users) == 0) {
 783
 784                         name = "system:authuser";
 785
 786                 } else if (dom_sid_compare(&ace->trustee,
 787                                        &global_sid_Builtin_Backup_Operators)
 788                            == 0) {
 789
 790                         name = "system:backup";
 791
 792                 } else {
 793
 794                         if (!lookup_sid(talloc_tos(), &ace->trustee,
 795                                         &dom_name, &name, &name_type)) {
 796                                 struct dom_sid_buf buf;
 797                                 DEBUG(1, ("AFSACL: Could not lookup SID %s on file %s\n",
 798                                           dom_sid_str_buf(&ace->trustee, &buf),
 799                                           filename));
 800                                 continue;
 801                         }
 802
 803                         if ( (name_type == SID_NAME_USER) ||
 804                              (name_type == SID_NAME_DOM_GRP) ||
 805                              (name_type == SID_NAME_ALIAS) ) {
 806                                 char *tmp;
 807                                 tmp = talloc_asprintf(talloc_tos(), "%s%s%s",
 808                                                        dom_name, lp_winbind_separator(),
 809                                                        name);
 810                                 if (tmp == NULL) {
 811                                         return false;
 812                                 }
 813                                 if (!strlower_m(tmp)) {
 814                                         return false;
 815                                 }
 816                                 name = tmp;
 817                         }
 818
 819                         if (sidpts) {
 820                                 struct dom_sid_buf buf;
 821                                 /* Expect all users/groups in pts as SIDs */
 822                                 name = talloc_strdup(
 823                                         talloc_tos(),
 824                                         dom_sid_str_buf(&ace->trustee, &buf));
 825                                 if (name == NULL) {
 826                                         return false;
 827                                 }
 828                         }
 829                 }
 830
 831                 while ((p = strchr_m(name, ' ')) != NULL)
 832                         *p = space_replacement;
 833
 834                 add_afs_ace(afs_acl, true, name,
 835                             nt_to_afs_rights(filename, ace));
 836         }
 837
 838         return true;
 839 }
 840
 841 static bool afs_get_afs_acl(const char *filename, struct afs_acl *acl)
 842 {
 843         struct afs_iob iob;
 844
 845         int ret;
 846
 847         char space[MAXSIZE];
 848
 849         DEBUG(5, ("afs_get_afs_acl: %s\n", filename));
 850
 851         iob.in_size = 0;
 852         iob.out_size = MAXSIZE;
 853         iob.in = iob.out = space;
 854
 855         ret = afs_syscall(AFSCALL_PIOCTL, filename, VIOCGETAL,
 856                           (char *)&iob, 0);
 857
 858         if (ret) {
 859                 DEBUG(1, ("got error from PIOCTL: %d\n", ret));
 860                 return false;
 861         }
 862
 863         if (!init_afs_acl(acl))
 864                 return false;
 865
 866         if (!parse_afs_acl(acl, space)) {
 867                 DEBUG(1, ("Could not parse AFS acl\n"));
 868                 free_afs_acl(acl);
 869                 return false;
 870         }
 871
 872         return true;
 873 }
 874
 875 /* For setting an AFS ACL we have to take care of the ACEs we could
 876  * not properly map to SIDs. Merge all of them into the new ACL. */
 877
 878 static void merge_unknown_aces(struct afs_acl *src, struct afs_acl *dst)
 879 {
 880         struct afs_ace *ace;
 881
 882         for (ace = src->acelist; ace != NULL; ace = ace->next)
 883         {
 884                 struct afs_ace *copy;
 885
 886                 if (ace->type != SID_NAME_UNKNOWN) {
 887                         DEBUG(10, ("Not merging known ACE for %s\n",
 888                                    ace->name));
 889                         continue;
 890                 }
 891
 892                 DEBUG(10, ("Merging unknown ACE for %s\n", ace->name));
 893
 894                 copy = clone_afs_ace(dst->ctx, ace);
 895
 896                 if (copy == NULL) {
 897                         DEBUG(0, ("Could not clone ACE for %s\n", ace->name));
 898                         continue;
 899                 }
 900
 901                 copy->next = dst->acelist;
 902                 dst->acelist = copy;
 903                 dst->num_aces += 1;
 904         }
 905 }
 906
 907 static NTSTATUS afs_set_nt_acl(vfs_handle_struct *handle, files_struct *fsp,
 908                            uint32_t security_info_sent,
 909                            const struct security_descriptor *psd)
 910 {
 911         struct afs_acl old_afs_acl, new_afs_acl;
 912         struct afs_acl dir_acl, file_acl;
 913         char acl_string[MAXSIZE];
 914         struct afs_iob iob;
 915         int ret = -1;
 916         char *name = NULL;
 917         const char *fileacls;
 918
 919         fileacls = lp_parm_const_string(SNUM(handle->conn), "afsacl", "fileacls",
 920                                         "yes");
 921
 922         sidpts = lp_parm_bool(SNUM(handle->conn), "afsacl", "sidpts", false);
 923
 924         ZERO_STRUCT(old_afs_acl);
 925         ZERO_STRUCT(new_afs_acl);
 926         ZERO_STRUCT(dir_acl);
 927         ZERO_STRUCT(file_acl);
 928
 929         name = talloc_strdup(talloc_tos(), fsp->fsp_name->base_name);
 930         if (!name) {
 931                 return NT_STATUS_NO_MEMORY;
 932         }
 933
 934         if (!fsp->fsp_flags.is_directory) {
 935                 /* We need to get the name of the directory containing the
 936                  * file, this is where the AFS acls live */
 937                 char *p = strrchr(name, '/');
 938                 if (p != NULL) {
 939                         *p = '\0';
 940                 } else {
 941                         name = talloc_strdup(talloc_tos(), ".");
 942                         if (!name) {
 943                                 return NT_STATUS_NO_MEMORY;
 944                         }
 945                 }
 946         }
 947
 948         if (!afs_get_afs_acl(name, &old_afs_acl)) {
 949                 DEBUG(3, ("Could not get old ACL of %s\n", fsp_str_dbg(fsp)));
 950                 goto done;
 951         }
 952
 953         split_afs_acl(&old_afs_acl, &dir_acl, &file_acl);
 954
 955         if (fsp->fsp_flags.is_directory) {
 956
 957                 if (!strequal(fileacls, "yes")) {
 958                         /* Throw away file acls, we depend on the
 959                          * inheritance ACEs that also give us file
 960                          * permissions */
 961                         free_afs_acl(&file_acl);
 962                 }
 963
 964                 free_afs_acl(&dir_acl);
 965                 if (!nt_to_afs_acl(fsp->fsp_name->base_name,
 966                                    security_info_sent, psd,
 967                                    nt_to_afs_dir_rights, &dir_acl))
 968                         goto done;
 969         } else {
 970                 if (strequal(fileacls, "no")) {
 971                         ret = -1;
 972                         goto done;
 973                 }
 974
 975                 if (strequal(fileacls, "ignore")) {
 976                         ret = 0;
 977                         goto done;
 978                 }
 979
 980                 free_afs_acl(&file_acl);
 981                 if (!nt_to_afs_acl(fsp->fsp_name->base_name,
 982                                    security_info_sent, psd,
 983                                    nt_to_afs_file_rights, &file_acl))
 984                         goto done;
 985         }
 986
 987         merge_afs_acls(&dir_acl, &file_acl, &new_afs_acl);
 988
 989         merge_unknown_aces(&old_afs_acl, &new_afs_acl);
 990
 991         unparse_afs_acl(&new_afs_acl, acl_string);
 992
 993         iob.in = acl_string;
 994         iob.in_size = 1+strlen(iob.in);
 995         iob.out = NULL;
 996         iob.out_size = 0;
 997
 998         DEBUG(10, ("trying to set acl '%s' on file %s\n", iob.in, name));
 999
1000         ret = afs_syscall(AFSCALL_PIOCTL, name, VIOCSETAL, (char *)&iob, 0);
1001
1002         if (ret != 0) {
1003                 DEBUG(10, ("VIOCSETAL returned %d\n", ret));
1004         }
1005
1006  done:
1007         free_afs_acl(&dir_acl);
1008         free_afs_acl(&file_acl);
1009         free_afs_acl(&old_afs_acl);
1010         free_afs_acl(&new_afs_acl);
1011
1012         return (ret == 0) ? NT_STATUS_OK : NT_STATUS_ACCESS_DENIED;
1013 }
1014
1015 static NTSTATUS afsacl_fget_nt_acl(struct vfs_handle_struct *handle,
1016                                    struct files_struct *fsp,
1017                                    uint32_t security_info,
1018                                    TALLOC_CTX *mem_ctx,
1019                                    struct security_descriptor **ppdesc)
1020 {
1021         struct afs_acl acl;
1022         size_t sd_size;
1023
1024         DEBUG(5, ("afsacl_fget_nt_acl: %s\n", fsp_str_dbg(fsp)));
1025
1026         sidpts = lp_parm_bool(SNUM(fsp->conn), "afsacl", "sidpts", false);
1027
1028         if (!afs_get_afs_acl(fsp->fsp_name->base_name, &acl)) {
1029                 return NT_STATUS_ACCESS_DENIED;
1030         }
1031
1032         sd_size = afs_fto_nt_acl(&acl, fsp, security_info, mem_ctx, ppdesc);
1033
1034         free_afs_acl(&acl);
1035
1036         return (sd_size != 0) ? NT_STATUS_OK : NT_STATUS_ACCESS_DENIED;
1037 }
1038
1039 static NTSTATUS afsacl_fset_nt_acl(vfs_handle_struct *handle,
1040                          files_struct *fsp,
1041                          uint32_t security_info_sent,
1042                          const struct security_descriptor *psd)
1043 {
1044         return afs_set_nt_acl(handle, fsp, security_info_sent, psd);
1045 }
1046
1047 static int afsacl_connect(vfs_handle_struct *handle,
1048                           const char *service,
1049                           const char *user)
1050 {
1051         const char *spc;
1052         int ret = SMB_VFS_NEXT_CONNECT(handle, service, user);
1053
1054         if (ret < 0) {
1055                 return ret;
1056         }
1057
1058         spc = lp_parm_const_string(SNUM(handle->conn), "afsacl", "space", "%");
1059
1060         if (spc != NULL)
1061                 space_replacement = spc[0];
1062
1063         return 0;
1064 }
1065
1066 /* We don't have a linear form of the AFS ACL yet */
1067 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)
1068 {
1069         errno = ENOSYS;
1070         return -1;
1071 }
1072
1073 static struct vfs_fn_pointers vfs_afsacl_fns = {
1074         .connect_fn = afsacl_connect,
1075         .fget_nt_acl_fn = afsacl_fget_nt_acl,
1076         .fset_nt_acl_fn = afsacl_fset_nt_acl,
1077         .sys_acl_blob_get_fd_fn = afsacl_sys_acl_blob_get_fd
1078 };
1079
1080 static_decl_vfs;
1081 NTSTATUS vfs_afsacl_init(TALLOC_CTX *ctx)
1082 {
1083         return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "afsacl",
1084                                 &vfs_afsacl_fns);
1085 }