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
  22 #undef DBGC_CLASS
  23 #define DBGC_CLASS DBGC_VFS
  24
  25 #include <afs/stds.h>
  26 #include <afs/afs.h>
  27 #include <afs/auth.h>
  28 #include <afs/venus.h>
  29 #include <afs/prs_fs.h>
  30
  31 #define MAXSIZE 2048
  32
  33 extern const struct dom_sid global_sid_World;
  34 extern const struct dom_sid global_sid_Builtin_Administrators;
  35 extern const struct dom_sid global_sid_Builtin_Backup_Operators;
  36 extern const struct dom_sid global_sid_Authenticated_Users;
  37 extern const struct dom_sid global_sid_NULL;
  38
  39 static char space_replacement = '%';
  40
  41 /* Do we expect SIDs as pts names? */
  42 static bool sidpts;
  43
  44 extern int afs_syscall(int, char *, int, char *, int);
  45
  46 struct afs_ace {
  47         bool positive;
  48         char *name;
  49         struct dom_sid sid;
  50         enum lsa_SidType type;
  51         uint32 rights;
  52         struct afs_ace *next;
  53 };
  54
  55 struct afs_acl {
  56         TALLOC_CTX *ctx;
  57         int type;
  58         int num_aces;
  59         struct afs_ace *acelist;
  60 };
  61
  62 struct afs_iob {
  63         char *in, *out;
  64         uint16 in_size, out_size;
  65 };
  66
  67
  68 static bool init_afs_acl(struct afs_acl *acl)
  69 {
  70         ZERO_STRUCT(*acl);
  71         acl->ctx = talloc_init("afs_acl");
  72         if (acl->ctx == NULL) {
  73                 DEBUG(10, ("Could not init afs_acl"));
  74                 return False;
  75         }
  76         return True;
  77 }
  78
  79 static void free_afs_acl(struct afs_acl *acl)
  80 {
  81         if (acl->ctx != NULL)
  82                 talloc_destroy(acl->ctx);
  83         acl->ctx = NULL;
  84         acl->num_aces = 0;
  85         acl->acelist = NULL;
  86 }
  87
  88 static struct afs_ace *clone_afs_ace(TALLOC_CTX *mem_ctx, struct afs_ace *ace)
  89 {
  90         struct afs_ace *result = TALLOC_P(mem_ctx, struct afs_ace);
  91
  92         if (result == NULL)
  93                 return NULL;
  94
  95         *result = *ace;
  96
  97         result->next = NULL;
  98         result->name = talloc_strdup(mem_ctx, ace->name);
  99
 100         if (result->name == NULL) {
 101                 return NULL;
 102         }
 103
 104         return result;
 105 }
 106
 107 static struct afs_ace *new_afs_ace(TALLOC_CTX *mem_ctx,
 108                                    bool positive,
 109                                    const char *name, uint32 rights)
 110 {
 111         struct dom_sid sid;
 112         enum lsa_SidType type;
 113         struct afs_ace *result;
 114
 115         if (strcmp(name, "system:administrators") == 0) {
 116
 117                 sid_copy(&sid, &global_sid_Builtin_Administrators);
 118                 type = SID_NAME_ALIAS;
 119
 120         } else if (strcmp(name, "system:anyuser") == 0) {
 121
 122                 sid_copy(&sid, &global_sid_World);
 123                 type = SID_NAME_ALIAS;
 124
 125         } else if (strcmp(name, "system:authuser") == 0) {
 126
 127                 sid_copy(&sid, &global_sid_Authenticated_Users);
 128                 type = SID_NAME_WKN_GRP;
 129
 130         } else if (strcmp(name, "system:backup") == 0) {
 131
 132                 sid_copy(&sid, &global_sid_Builtin_Backup_Operators);
 133                 type = SID_NAME_ALIAS;
 134
 135         } else if (sidpts) {
 136                 /* All PTS users/groups are expressed as SIDs */
 137
 138                 sid_copy(&sid, &global_sid_NULL);
 139                 type = SID_NAME_UNKNOWN;
 140
 141                 if (string_to_sid(&sid, name)) {
 142                         const char *user, *domain;
 143                         /* We have to find the type, look up the SID */
 144                         lookup_sid(talloc_tos(), &sid,
 145                                    &domain, &user, &type);
 146                 }
 147
 148         } else {
 149
 150                 const char *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(talloc_tos(), name, LOOKUP_NAME_ALL,
 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 | SEC_GENERIC_WRITE, 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 | SEC_GENERIC_WRITE, 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 struct security_ace *ace)
 532 {
 533         uint32 result = 0;
 534         uint32 rights = ace->access_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->access_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->access_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 struct security_ace *ace)
 573 {
 574         uint32 result = 0;
 575         uint32 rights = ace->access_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_common(struct afs_acl *afs_acl,
 589                                    SMB_STRUCT_STAT *psbuf,
 590                                    uint32 security_info,
 591                                    struct security_descriptor **ppdesc)
 592 {
 593         struct security_ace *nt_ace_list;
 594         struct dom_sid owner_sid, group_sid;
 595         struct security_acl *psa = NULL;
 596         int good_aces;
 597         size_t sd_size;
 598         TALLOC_CTX *mem_ctx = talloc_tos();
 599
 600         struct afs_ace *afs_ace;
 601
 602         uid_to_sid(&owner_sid, psbuf->st_ex_uid);
 603         gid_to_sid(&group_sid, psbuf->st_ex_gid);
 604
 605         if (afs_acl->num_aces) {
 606                 nt_ace_list = TALLOC_ARRAY(mem_ctx, struct security_ace, afs_acl->num_aces);
 607
 608                 if (nt_ace_list == NULL)
 609                         return 0;
 610         } else {
 611                 nt_ace_list = NULL;
 612         }
 613
 614         afs_ace = afs_acl->acelist;
 615         good_aces = 0;
 616
 617         while (afs_ace != NULL) {
 618                 uint32_t nt_rights;
 619                 uint8 flag = SEC_ACE_FLAG_OBJECT_INHERIT |
 620                         SEC_ACE_FLAG_CONTAINER_INHERIT;
 621
 622                 if (afs_ace->type == SID_NAME_UNKNOWN) {
 623                         DEBUG(10, ("Ignoring unknown name %s\n",
 624                                    afs_ace->name));
 625                         afs_ace = afs_ace->next;
 626                         continue;
 627                 }
 628
 629                 if (S_ISDIR(psbuf->st_ex_mode))
 630                         afs_to_nt_dir_rights(afs_ace->rights, &nt_rights,
 631                                              &flag);
 632                 else
 633                         nt_rights = afs_to_nt_file_rights(afs_ace->rights);
 634
 635                 init_sec_ace(&nt_ace_list[good_aces++], &(afs_ace->sid),
 636                              SEC_ACE_TYPE_ACCESS_ALLOWED, nt_rights, flag);
 637                 afs_ace = afs_ace->next;
 638         }
 639
 640         psa = make_sec_acl(mem_ctx, NT4_ACL_REVISION,
 641                            good_aces, nt_ace_list);
 642         if (psa == NULL)
 643                 return 0;
 644
 645         *ppdesc = make_sec_desc(mem_ctx, SD_REVISION,
 646                                 SEC_DESC_SELF_RELATIVE,
 647                                 (security_info & SECINFO_OWNER)
 648                                 ? &owner_sid : NULL,
 649                                 (security_info & SECINFO_GROUP)
 650                                 ? &group_sid : NULL,
 651                                 NULL, psa, &sd_size);
 652
 653         return sd_size;
 654 }
 655
 656 static size_t afs_to_nt_acl(struct afs_acl *afs_acl,
 657                             struct connection_struct *conn,
 658                             struct smb_filename *smb_fname,
 659                             uint32 security_info,
 660                             struct security_descriptor **ppdesc)
 661 {
 662         int ret;
 663
 664         /* Get the stat struct for the owner info. */
 665         if (lp_posix_pathnames()) {
 666                 ret = SMB_VFS_LSTAT(conn, smb_fname);
 667         } else {
 668                 ret = SMB_VFS_STAT(conn, smb_fname);
 669         }
 670         if (ret == -1) {
 671                 return 0;
 672         }
 673
 674         return afs_to_nt_acl_common(afs_acl, &smb_fname->st, security_info,
 675                                     ppdesc);
 676 }
 677
 678 static size_t afs_fto_nt_acl(struct afs_acl *afs_acl,
 679                              struct files_struct *fsp,
 680                              uint32 security_info,
 681                              struct security_descriptor **ppdesc)
 682 {
 683         SMB_STRUCT_STAT sbuf;
 684
 685         if (fsp->is_directory || fsp->fh->fd == -1) {
 686                 /* Get the stat struct for the owner info. */
 687                 return afs_to_nt_acl(afs_acl, fsp->conn, fsp->fsp_name,
 688                                      security_info, ppdesc);
 689         }
 690
 691         if(SMB_VFS_FSTAT(fsp, &sbuf) != 0) {
 692                 return 0;
 693         }
 694
 695         return afs_to_nt_acl_common(afs_acl, &sbuf, security_info, ppdesc);
 696 }
 697
 698 static bool mappable_sid(const struct dom_sid *sid)
 699 {
 700         struct dom_sid domain_sid;
 701
 702         if (sid_compare(sid, &global_sid_Builtin_Administrators) == 0)
 703                 return True;
 704
 705         if (sid_compare(sid, &global_sid_World) == 0)
 706                 return True;
 707
 708         if (sid_compare(sid, &global_sid_Authenticated_Users) == 0)
 709                 return True;
 710
 711         if (sid_compare(sid, &global_sid_Builtin_Backup_Operators) == 0)
 712                 return True;
 713
 714         string_to_sid(&domain_sid, "S-1-5-21");
 715
 716         if (sid_compare_domain(sid, &domain_sid) == 0)
 717                 return True;
 718
 719         return False;
 720 }
 721
 722 static bool nt_to_afs_acl(const char *filename,
 723                           uint32 security_info_sent,
 724                           const struct security_descriptor *psd,
 725                           uint32 (*nt_to_afs_rights)(const char *filename,
 726                                                      const struct security_ace *ace),
 727                           struct afs_acl *afs_acl)
 728 {
 729         const struct security_acl *dacl;
 730         int i;
 731
 732         /* Currently we *only* look at the dacl */
 733
 734         if (((security_info_sent & SECINFO_DACL) == 0) ||
 735             (psd->dacl == NULL))
 736                 return True;
 737
 738         if (!init_afs_acl(afs_acl))
 739                 return False;
 740
 741         dacl = psd->dacl;
 742
 743         for (i = 0; i < dacl->num_aces; i++) {
 744                 const struct security_ace *ace = &(dacl->aces[i]);
 745                 const char *dom_name, *name;
 746                 enum lsa_SidType name_type;
 747                 char *p;
 748
 749                 if (ace->type != SEC_ACE_TYPE_ACCESS_ALLOWED) {
 750                         /* First cut: Only positive ACEs */
 751                         return False;
 752                 }
 753
 754                 if (!mappable_sid(&ace->trustee)) {
 755                         DEBUG(10, ("Ignoring unmappable SID %s\n",
 756                                    sid_string_dbg(&ace->trustee)));
 757                         continue;
 758                 }
 759
 760                 if (sid_compare(&ace->trustee,
 761                                 &global_sid_Builtin_Administrators) == 0) {
 762
 763                         name = "system:administrators";
 764
 765                 } else if (sid_compare(&ace->trustee,
 766                                        &global_sid_World) == 0) {
 767
 768                         name = "system:anyuser";
 769
 770                 } else if (sid_compare(&ace->trustee,
 771                                        &global_sid_Authenticated_Users) == 0) {
 772
 773                         name = "system:authuser";
 774
 775                 } else if (sid_compare(&ace->trustee,
 776                                        &global_sid_Builtin_Backup_Operators)
 777                            == 0) {
 778
 779                         name = "system:backup";
 780
 781                 } else {
 782
 783                         if (!lookup_sid(talloc_tos(), &ace->trustee,
 784                                         &dom_name, &name, &name_type)) {
 785                                 DEBUG(1, ("AFSACL: Could not lookup SID %s on file %s\n",
 786                                           sid_string_dbg(&ace->trustee),
 787                                           filename));
 788                                 continue;
 789                         }
 790
 791                         if ( (name_type == SID_NAME_USER) ||
 792                              (name_type == SID_NAME_DOM_GRP) ||
 793                              (name_type == SID_NAME_ALIAS) ) {
 794                                 char *tmp;
 795                                 tmp = talloc_asprintf(talloc_tos(), "%s%s%s",
 796                                                        dom_name, lp_winbind_separator(),
 797                                                        name);
 798                                 if (tmp == NULL) {
 799                                         return False;
 800                                 }
 801                                 strlower_m(tmp);
 802                                 name = tmp;
 803                         }
 804
 805                         if (sidpts) {
 806                                 /* Expect all users/groups in pts as SIDs */
 807                                 name = talloc_strdup(
 808                                         talloc_tos(),
 809                                         sid_string_tos(&ace->trustee));
 810                                 if (name == NULL) {
 811                                         return False;
 812                                 }
 813                         }
 814                 }
 815
 816                 while ((p = strchr_m(name, ' ')) != NULL)
 817                         *p = space_replacement;
 818
 819                 add_afs_ace(afs_acl, True, name,
 820                             nt_to_afs_rights(filename, ace));
 821         }
 822
 823         return True;
 824 }
 825
 826 static bool afs_get_afs_acl(char *filename, struct afs_acl *acl)
 827 {
 828         struct afs_iob iob;
 829
 830         int ret;
 831
 832         char space[MAXSIZE];
 833
 834         DEBUG(5, ("afs_get_afs_acl: %s\n", filename));
 835
 836         iob.in_size = 0;
 837         iob.out_size = MAXSIZE;
 838         iob.in = iob.out = space;
 839
 840         ret = afs_syscall(AFSCALL_PIOCTL, filename, VIOCGETAL,
 841                           (char *)&iob, 0);
 842
 843         if (ret) {
 844                 DEBUG(1, ("got error from PIOCTL: %d\n", ret));
 845                 return False;
 846         }
 847
 848         if (!init_afs_acl(acl))
 849                 return False;
 850
 851         if (!parse_afs_acl(acl, space)) {
 852                 DEBUG(1, ("Could not parse AFS acl\n"));
 853                 free_afs_acl(acl);
 854                 return False;
 855         }
 856
 857         return True;
 858 }
 859
 860 /* For setting an AFS ACL we have to take care of the ACEs we could
 861  * not properly map to SIDs. Merge all of them into the new ACL. */
 862
 863 static void merge_unknown_aces(struct afs_acl *src, struct afs_acl *dst)
 864 {
 865         struct afs_ace *ace;
 866
 867         for (ace = src->acelist; ace != NULL; ace = ace->next)
 868         {
 869                 struct afs_ace *copy;
 870
 871                 if (ace->type != SID_NAME_UNKNOWN) {
 872                         DEBUG(10, ("Not merging known ACE for %s\n",
 873                                    ace->name));
 874                         continue;
 875                 }
 876
 877                 DEBUG(10, ("Merging unknown ACE for %s\n", ace->name));
 878
 879                 copy = clone_afs_ace(dst->ctx, ace);
 880
 881                 if (copy == NULL) {
 882                         DEBUG(0, ("Could not clone ACE for %s\n", ace->name));
 883                         continue;
 884                 }
 885
 886                 copy->next = dst->acelist;
 887                 dst->acelist = copy;
 888                 dst->num_aces += 1;
 889         }
 890 }
 891
 892 static NTSTATUS afs_set_nt_acl(vfs_handle_struct *handle, files_struct *fsp,
 893                            uint32 security_info_sent,
 894                            const struct security_descriptor *psd)
 895 {
 896         struct afs_acl old_afs_acl, new_afs_acl;
 897         struct afs_acl dir_acl, file_acl;
 898         char acl_string[2049];
 899         struct afs_iob iob;
 900         int ret = -1;
 901         char *name = NULL;
 902         const char *fileacls;
 903
 904         fileacls = lp_parm_const_string(SNUM(handle->conn), "afsacl", "fileacls",
 905                                         "yes");
 906
 907         sidpts = lp_parm_bool(SNUM(handle->conn), "afsacl", "sidpts", False);
 908
 909         ZERO_STRUCT(old_afs_acl);
 910         ZERO_STRUCT(new_afs_acl);
 911         ZERO_STRUCT(dir_acl);
 912         ZERO_STRUCT(file_acl);
 913
 914         name = talloc_strdup(talloc_tos(), fsp->fsp_name->base_name);
 915         if (!name) {
 916                 return NT_STATUS_NO_MEMORY;
 917         }
 918
 919         if (!fsp->is_directory) {
 920                 /* We need to get the name of the directory containing the
 921                  * file, this is where the AFS acls live */
 922                 char *p = strrchr(name, '/');
 923                 if (p != NULL) {
 924                         *p = '\0';
 925                 } else {
 926                         name = talloc_strdup(talloc_tos(), ".");
 927                         if (!name) {
 928                                 return NT_STATUS_NO_MEMORY;
 929                         }
 930                 }
 931         }
 932
 933         if (!afs_get_afs_acl(name, &old_afs_acl)) {
 934                 DEBUG(3, ("Could not get old ACL of %s\n", fsp_str_dbg(fsp)));
 935                 goto done;
 936         }
 937
 938         split_afs_acl(&old_afs_acl, &dir_acl, &file_acl);
 939
 940         if (fsp->is_directory) {
 941
 942                 if (!strequal(fileacls, "yes")) {
 943                         /* Throw away file acls, we depend on the
 944                          * inheritance ACEs that also give us file
 945                          * permissions */
 946                         free_afs_acl(&file_acl);
 947                 }
 948
 949                 free_afs_acl(&dir_acl);
 950                 if (!nt_to_afs_acl(fsp->fsp_name->base_name,
 951                                    security_info_sent, psd,
 952                                    nt_to_afs_dir_rights, &dir_acl))
 953                         goto done;
 954         } else {
 955                 if (strequal(fileacls, "no")) {
 956                         ret = -1;
 957                         goto done;
 958                 }
 959
 960                 if (strequal(fileacls, "ignore")) {
 961                         ret = 0;
 962                         goto done;
 963                 }
 964
 965                 free_afs_acl(&file_acl);
 966                 if (!nt_to_afs_acl(fsp->fsp_name->base_name,
 967                                    security_info_sent, psd,
 968                                    nt_to_afs_file_rights, &file_acl))
 969                         goto done;
 970         }
 971
 972         merge_afs_acls(&dir_acl, &file_acl, &new_afs_acl);
 973
 974         merge_unknown_aces(&old_afs_acl, &new_afs_acl);
 975
 976         unparse_afs_acl(&new_afs_acl, acl_string);
 977
 978         iob.in = acl_string;
 979         iob.in_size = 1+strlen(iob.in);
 980         iob.out = NULL;
 981         iob.out_size = 0;
 982
 983         DEBUG(10, ("trying to set acl '%s' on file %s\n", iob.in, name));
 984
 985         ret = afs_syscall(AFSCALL_PIOCTL, name, VIOCSETAL, (char *)&iob, 0);
 986
 987         if (ret != 0) {
 988                 DEBUG(10, ("VIOCSETAL returned %d\n", ret));
 989         }
 990
 991  done:
 992         free_afs_acl(&dir_acl);
 993         free_afs_acl(&file_acl);
 994         free_afs_acl(&old_afs_acl);
 995         free_afs_acl(&new_afs_acl);
 996
 997         return (ret == 0) ? NT_STATUS_OK : NT_STATUS_ACCESS_DENIED;
 998 }
 999
1000 static NTSTATUS afsacl_fget_nt_acl(struct vfs_handle_struct *handle,
1001                                    struct files_struct *fsp,
1002                                    uint32 security_info,
1003                                    struct security_descriptor **ppdesc)
1004 {
1005         struct afs_acl acl;
1006         size_t sd_size;
1007
1008         DEBUG(5, ("afsacl_fget_nt_acl: %s\n", fsp_str_dbg(fsp)));
1009
1010         sidpts = lp_parm_bool(SNUM(fsp->conn), "afsacl", "sidpts", False);
1011
1012         if (!afs_get_afs_acl(fsp->fsp_name->base_name, &acl)) {
1013                 return NT_STATUS_ACCESS_DENIED;
1014         }
1015
1016         sd_size = afs_fto_nt_acl(&acl, fsp, security_info, ppdesc);
1017
1018         free_afs_acl(&acl);
1019
1020         return (sd_size != 0) ? NT_STATUS_OK : NT_STATUS_ACCESS_DENIED;
1021 }
1022
1023 static NTSTATUS afsacl_get_nt_acl(struct vfs_handle_struct *handle,
1024                                   const char *name,  uint32 security_info,
1025                                   struct security_descriptor **ppdesc)
1026 {
1027         struct afs_acl acl;
1028         size_t sd_size;
1029         struct smb_filename *smb_fname = NULL;
1030         NTSTATUS status;
1031
1032         DEBUG(5, ("afsacl_get_nt_acl: %s\n", name));
1033
1034         sidpts = lp_parm_bool(SNUM(handle->conn), "afsacl", "sidpts", False);
1035
1036         if (!afs_get_afs_acl(name, &acl)) {
1037                 return NT_STATUS_ACCESS_DENIED;
1038         }
1039
1040         status = create_synthetic_smb_fname(talloc_tos(), name, NULL, NULL,
1041                                             &smb_fname);
1042         if (!NT_STATUS_IS_OK(status)) {
1043                 free_afs_acl(&acl);
1044                 return status;
1045         }
1046
1047         sd_size = afs_to_nt_acl(&acl, handle->conn, smb_fname, security_info,
1048                                 ppdesc);
1049         TALLOC_FREE(smb_fname);
1050
1051         free_afs_acl(&acl);
1052
1053         return (sd_size != 0) ? NT_STATUS_OK : NT_STATUS_ACCESS_DENIED;
1054 }
1055
1056 NTSTATUS afsacl_fset_nt_acl(vfs_handle_struct *handle,
1057                          files_struct *fsp,
1058                          uint32 security_info_sent,
1059                          const struct security_descriptor *psd)
1060 {
1061         return afs_set_nt_acl(handle, fsp, security_info_sent, psd);
1062 }
1063
1064 static int afsacl_connect(vfs_handle_struct *handle,
1065                           const char *service,
1066                           const char *user)
1067 {
1068         const char *spc;
1069         int ret = SMB_VFS_NEXT_CONNECT(handle, service, user);
1070
1071         if (ret < 0) {
1072                 return ret;
1073         }
1074
1075         spc = lp_parm_const_string(SNUM(handle->conn), "afsacl", "space", "%");
1076
1077         if (spc != NULL)
1078                 space_replacement = spc[0];
1079
1080         return 0;
1081 }
1082
1083 static struct vfs_fn_pointers vfs_afsacl_fns = {
1084         .connect_fn = afsacl_connect,
1085         .fget_nt_acl = afsacl_fget_nt_acl,
1086         .get_nt_acl = afsacl_get_nt_acl,
1087         .fset_nt_acl = afsacl_fset_nt_acl
1088 };
1089
1090 NTSTATUS vfs_afsacl_init(void);
1091 NTSTATUS vfs_afsacl_init(void)
1092 {
1093         return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "afsacl",
1094                                 &vfs_afsacl_fns);
1095 }