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
  28 #undef DBGC_CLASS
  29 #define DBGC_CLASS DBGC_VFS
  30
  31 #include <afs/stds.h>
  32 #include <afs/afs.h>
  33 #include <afs/auth.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 extern int afs_syscall(int, const char *, int, char *, int);
  51
  52 struct afs_ace {
  53         bool positive;
  54         char *name;
  55         struct dom_sid sid;
  56         enum lsa_SidType type;
  57         uint32 rights;
  58         struct afs_ace *next;
  59 };
  60
  61 struct afs_acl {
  62         TALLOC_CTX *ctx;
  63         int type;
  64         int num_aces;
  65         struct afs_ace *acelist;
  66 };
  67
  68 struct afs_iob {
  69         char *in, *out;
  70         uint16 in_size, out_size;
  71 };
  72
  73
  74 static bool init_afs_acl(struct afs_acl *acl)
  75 {
  76         ZERO_STRUCT(*acl);
  77         acl->ctx = talloc_init("afs_acl");
  78         if (acl->ctx == NULL) {
  79                 DEBUG(10, ("Could not init afs_acl"));
  80                 return false;
  81         }
  82         return true;
  83 }
  84
  85 static void free_afs_acl(struct afs_acl *acl)
  86 {
  87         if (acl->ctx != NULL)
  88                 talloc_destroy(acl->ctx);
  89         acl->ctx = NULL;
  90         acl->num_aces = 0;
  91         acl->acelist = NULL;
  92 }
  93
  94 static struct afs_ace *clone_afs_ace(TALLOC_CTX *mem_ctx, struct afs_ace *ace)
  95 {
  96         struct afs_ace *result = talloc(mem_ctx, struct afs_ace);
  97
  98         if (result == NULL)
  99                 return NULL;
 100
 101         *result = *ace;
 102
 103         result->next = NULL;
 104         result->name = talloc_strdup(mem_ctx, ace->name);
 105
 106         if (result->name == NULL) {
 107                 return NULL;
 108         }
 109
 110         return result;
 111 }
 112
 113 static struct afs_ace *new_afs_ace(TALLOC_CTX *mem_ctx,
 114                                    bool positive,
 115                                    const char *name, uint32 rights)
 116 {
 117         struct dom_sid sid;
 118         enum lsa_SidType type;
 119         struct afs_ace *result;
 120
 121         if (strcmp(name, "system:administrators") == 0) {
 122
 123                 sid_copy(&sid, &global_sid_Builtin_Administrators);
 124                 type = SID_NAME_ALIAS;
 125
 126         } else if (strcmp(name, "system:anyuser") == 0) {
 127
 128                 sid_copy(&sid, &global_sid_World);
 129                 type = SID_NAME_ALIAS;
 130
 131         } else if (strcmp(name, "system:authuser") == 0) {
 132
 133                 sid_copy(&sid, &global_sid_Authenticated_Users);
 134                 type = SID_NAME_WKN_GRP;
 135
 136         } else if (strcmp(name, "system:backup") == 0) {
 137
 138                 sid_copy(&sid, &global_sid_Builtin_Backup_Operators);
 139                 type = SID_NAME_ALIAS;
 140
 141         } else if (sidpts) {
 142                 /* All PTS users/groups are expressed as SIDs */
 143
 144                 sid_copy(&sid, &global_sid_NULL);
 145                 type = SID_NAME_UNKNOWN;
 146
 147                 if (string_to_sid(&sid, name)) {
 148                         const char *user, *domain;
 149                         /* We have to find the type, look up the SID */
 150                         lookup_sid(talloc_tos(), &sid,
 151                                    &domain, &user, &type);
 152                 }
 153
 154         } else {
 155
 156                 const char *domain, *uname;
 157                 char *p;
 158
 159                 p = strchr_m(name, *lp_winbind_separator());
 160                 if (p != NULL) {
 161                         *p = '\\';
 162                 }
 163
 164                 if (!lookup_name(talloc_tos(), name, LOOKUP_NAME_ALL,
 165                                  &domain, &uname, &sid, &type)) {
 166                         DEBUG(10, ("Could not find AFS user %s\n", name));
 167
 168                         sid_copy(&sid, &global_sid_NULL);
 169                         type = SID_NAME_UNKNOWN;
 170
 171                 }
 172         }
 173
 174         result = talloc(mem_ctx, struct afs_ace);
 175
 176         if (result == NULL) {
 177                 DEBUG(0, ("Could not talloc AFS ace\n"));
 178                 return NULL;
 179         }
 180
 181         result->name = talloc_strdup(mem_ctx, name);
 182         if (result->name == NULL) {
 183                 DEBUG(0, ("Could not talloc AFS ace name\n"));
 184                 return NULL;
 185         }
 186
 187         result->sid = sid;
 188         result->type = type;
 189
 190         result->positive = positive;
 191         result->rights = rights;
 192
 193         return result;
 194 }
 195
 196 static void add_afs_ace(struct afs_acl *acl,
 197                         bool positive,
 198                         const char *name, uint32 rights)
 199 {
 200         struct afs_ace *ace;
 201
 202         for (ace = acl->acelist; ace != NULL; ace = ace->next) {
 203                 if ((ace->positive == positive) &&
 204                     (strequal(ace->name, name))) {
 205                         ace->rights |= rights;
 206                         return;
 207                 }
 208         }
 209
 210         ace = new_afs_ace(acl->ctx, positive, name, rights);
 211
 212         ace->next = acl->acelist;
 213         acl->acelist = ace;
 214
 215         acl->num_aces += 1;
 216
 217         DEBUG(10, ("add_afs_ace: Added %s entry for %s with rights %d\n",
 218                    ace->positive?"positive":"negative",
 219                    ace->name, ace->rights));
 220
 221         return;
 222 }
 223
 224 /* AFS ACLs in string form are a long string of fields delimited with \n.
 225  *
 226  * First line:  Number of positive entries
 227  * Second line: Number of negative entries
 228  * Third and following lines: The entries themselves
 229  *
 230  * An ACE is a line of two fields, delimited by \t.
 231  *
 232  * First field:  Name
 233  * Second field: Rights
 234  */
 235
 236 static bool parse_afs_acl(struct afs_acl *acl, const char *acl_str)
 237 {
 238         int nplus, nminus;
 239         int aces;
 240
 241         char str[MAXSIZE];
 242         char *p = str;
 243
 244         strlcpy(str, acl_str, MAXSIZE);
 245
 246         if (sscanf(p, "%d", &nplus) != 1)
 247                 return false;
 248
 249         DEBUG(10, ("Found %d positive entries\n", nplus));
 250
 251         if ((p = strchr(p, '\n')) == NULL)
 252                 return false;
 253         p += 1;
 254
 255         if (sscanf(p, "%d", &nminus) != 1)
 256                 return false;
 257
 258         DEBUG(10, ("Found %d negative entries\n", nminus));
 259
 260         if ((p = strchr(p, '\n')) == NULL)
 261                 return false;
 262         p += 1;
 263
 264         for (aces = nplus+nminus; aces > 0; aces--)
 265         {
 266
 267                 const char *namep;
 268                 fstring name;
 269                 uint32 rights;
 270                 char *space;
 271
 272                 namep = p;
 273
 274                 if ((p = strchr(p, '\t')) == NULL)
 275                         return false;
 276                 *p = '\0';
 277                 p += 1;
 278
 279                 if (sscanf(p, "%d", &rights) != 1)
 280                         return false;
 281
 282                 if ((p = strchr(p, '\n')) == NULL)
 283                         return false;
 284                 p += 1;
 285
 286                 fstrcpy(name, namep);
 287
 288                 while ((space = strchr_m(name, space_replacement)) != NULL)
 289                         *space = ' ';
 290
 291                 add_afs_ace(acl, nplus>0, name, rights);
 292
 293                 nplus -= 1;
 294         }
 295
 296         return true;
 297 }
 298
 299 static bool unparse_afs_acl(struct afs_acl *acl, char *acl_str)
 300 {
 301         /* TODO: String length checks!!!! */
 302
 303         int positives = 0;
 304         int negatives = 0;
 305         fstring line;
 306         struct afs_ace *ace = acl->acelist;
 307
 308         *acl_str = 0;
 309
 310         while (ace != NULL) {
 311                 if (ace->positive)
 312                         positives++;
 313                 else
 314                         negatives++;
 315                 ace = ace->next;
 316         }
 317
 318         fstr_sprintf(line, "%d\n", positives);
 319         if (strlcat(acl_str, line, MAXSIZE) >= MAXSIZE) {
 320                 return false;
 321         }
 322
 323         fstr_sprintf(line, "%d\n", negatives);
 324         if (strlcat(acl_str, line, MAXSIZE) >= MAXSIZE) {
 325                 return false;
 326         }
 327
 328         ace = acl->acelist;
 329
 330         while (ace != NULL) {
 331                 fstr_sprintf(line, "%s\t%d\n", ace->name, ace->rights);
 332                 if (strlcat(acl_str, line, MAXSIZE) >= MAXSIZE) {
 333                         return false;
 334                 }
 335                 ace = ace->next;
 336         }
 337         return true;
 338 }
 339
 340 static uint32 afs_to_nt_file_rights(uint32 rights)
 341 {
 342         uint32 result = 0;
 343
 344         if (rights & PRSFS_READ)
 345                 result |= FILE_READ_DATA | FILE_READ_EA |
 346                         FILE_EXECUTE | FILE_READ_ATTRIBUTES |
 347                         READ_CONTROL_ACCESS | SYNCHRONIZE_ACCESS;
 348
 349         if (rights & PRSFS_WRITE)
 350                 result |= FILE_WRITE_DATA | FILE_WRITE_ATTRIBUTES |
 351                         FILE_WRITE_EA | FILE_APPEND_DATA;
 352
 353         if (rights & PRSFS_LOCK)
 354                 result |= WRITE_OWNER_ACCESS;
 355
 356         if (rights & PRSFS_DELETE)
 357                 result |= DELETE_ACCESS;
 358
 359         return result;
 360 }
 361
 362 static void afs_to_nt_dir_rights(uint32 afs_rights, uint32 *nt_rights,
 363                                  uint8 *flag)
 364 {
 365         *nt_rights = 0;
 366         *flag = SEC_ACE_FLAG_OBJECT_INHERIT |
 367                 SEC_ACE_FLAG_CONTAINER_INHERIT;
 368
 369         if (afs_rights & PRSFS_INSERT)
 370                 *nt_rights |= FILE_ADD_FILE | FILE_ADD_SUBDIRECTORY;
 371
 372         if (afs_rights & PRSFS_LOOKUP)
 373                 *nt_rights |= FILE_READ_DATA | FILE_READ_EA |
 374                         FILE_EXECUTE | FILE_READ_ATTRIBUTES |
 375                         READ_CONTROL_ACCESS | SYNCHRONIZE_ACCESS;
 376
 377         if (afs_rights & PRSFS_WRITE)
 378                 *nt_rights |= FILE_WRITE_ATTRIBUTES | FILE_WRITE_DATA |
 379                         FILE_APPEND_DATA | FILE_WRITE_EA;
 380
 381         if ((afs_rights & (PRSFS_INSERT|PRSFS_LOOKUP|PRSFS_DELETE)) ==
 382             (PRSFS_INSERT|PRSFS_LOOKUP|PRSFS_DELETE))
 383                 *nt_rights |= FILE_WRITE_ATTRIBUTES | FILE_WRITE_EA |
 384                         GENERIC_WRITE_ACCESS;
 385
 386         if (afs_rights & PRSFS_DELETE)
 387                 *nt_rights |= DELETE_ACCESS;
 388
 389         if (afs_rights & PRSFS_ADMINISTER)
 390                 *nt_rights |= FILE_DELETE_CHILD | WRITE_DAC_ACCESS |
 391                         WRITE_OWNER_ACCESS;
 392
 393         if ( (afs_rights & PRSFS_LOOKUP) ==
 394              (afs_rights & (PRSFS_LOOKUP|PRSFS_READ)) ) {
 395                 /* Only lookup right */
 396                 *flag = SEC_ACE_FLAG_CONTAINER_INHERIT;
 397         }
 398
 399         return;
 400 }
 401
 402 #define AFS_FILE_RIGHTS (PRSFS_READ|PRSFS_WRITE|PRSFS_LOCK)
 403 #define AFS_DIR_RIGHTS  (PRSFS_INSERT|PRSFS_LOOKUP|PRSFS_DELETE|PRSFS_ADMINISTER)
 404
 405 static void split_afs_acl(struct afs_acl *acl,
 406                           struct afs_acl *dir_acl,
 407                           struct afs_acl *file_acl)
 408 {
 409         struct afs_ace *ace;
 410
 411         init_afs_acl(dir_acl);
 412         init_afs_acl(file_acl);
 413
 414         for (ace = acl->acelist; ace != NULL; ace = ace->next) {
 415                 if (ace->rights & AFS_FILE_RIGHTS) {
 416                         add_afs_ace(file_acl, ace->positive, ace->name,
 417                                     ace->rights & AFS_FILE_RIGHTS);
 418                 }
 419
 420                 if (ace->rights & AFS_DIR_RIGHTS) {
 421                         add_afs_ace(dir_acl, ace->positive, ace->name,
 422                                     ace->rights & AFS_DIR_RIGHTS);
 423                 }
 424         }
 425         return;
 426 }
 427
 428 static bool same_principal(struct afs_ace *x, struct afs_ace *y)
 429 {
 430         return ( (x->positive == y->positive) &&
 431                  (dom_sid_compare(&x->sid, &y->sid) == 0) );
 432 }
 433
 434 static void merge_afs_acls(struct afs_acl *dir_acl,
 435                            struct afs_acl *file_acl,
 436                            struct afs_acl *target)
 437 {
 438         struct afs_ace *ace;
 439
 440         init_afs_acl(target);
 441
 442         for (ace = dir_acl->acelist; ace != NULL; ace = ace->next) {
 443                 struct afs_ace *file_ace;
 444                 bool found = false;
 445
 446                 for (file_ace = file_acl->acelist;
 447                      file_ace != NULL;
 448                      file_ace = file_ace->next) {
 449                         if (!same_principal(ace, file_ace))
 450                                 continue;
 451
 452                         add_afs_ace(target, ace->positive, ace->name,
 453                                     ace->rights | file_ace->rights);
 454                         found = true;
 455                         break;
 456                 }
 457                 if (!found)
 458                         add_afs_ace(target, ace->positive, ace->name,
 459                                     ace->rights);
 460         }
 461
 462         for (ace = file_acl->acelist; ace != NULL; ace = ace->next) {
 463                 struct afs_ace *dir_ace;
 464                 bool already_seen = false;
 465
 466                 for (dir_ace = dir_acl->acelist;
 467                      dir_ace != NULL;
 468                      dir_ace = dir_ace->next) {
 469                         if (!same_principal(ace, dir_ace))
 470                                 continue;
 471                         already_seen = true;
 472                         break;
 473                 }
 474                 if (!already_seen)
 475                         add_afs_ace(target, ace->positive, ace->name,
 476                                     ace->rights);
 477         }
 478 }
 479
 480 #define PERMS_READ   0x001200a9
 481 #define PERMS_CHANGE 0x001301bf
 482 #define PERMS_FULL   0x001f01ff
 483
 484 static struct static_dir_ace_mapping {
 485         uint8 type;
 486         uint8 flags;
 487         uint32 mask;
 488         uint32 afs_rights;
 489 } ace_mappings[] = {
 490
 491         /* Full control */
 492         { 0, SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT,
 493           PERMS_FULL, 127 /* rlidwka */ },
 494
 495         /* Change (write) */
 496         { 0, SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT,
 497           PERMS_CHANGE, 63 /* rlidwk */ },
 498
 499         /* Read (including list folder content) */
 500         { 0, SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT,
 501           PERMS_READ, 9 /* rl */ },
 502
 503         /* Read without list folder content -- same as "l" */
 504         { 0, SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT,
 505           0x00120089, 8 /* l */ },
 506
 507         /* some stupid workaround for preventing fallbacks */
 508         { 0, 0x3, 0x0012019F, 9 /* rl */ },
 509         { 0, 0x13, PERMS_FULL, 127 /* full */ },
 510
 511         /* read, delete and execute access plus synchronize */
 512         { 0, 0x3, 0x001300A9, 9 /* should be rdl, set to rl */},
 513         /* classical read list */
 514         { 0, 0x13, 0x001200A9, 9 /* rl */},
 515         /* almost full control, no delete */
 516         { 0, 0x13, PERMS_CHANGE, 63 /* rwidlk */},
 517
 518         /* List folder */
 519         { 0, SEC_ACE_FLAG_CONTAINER_INHERIT,
 520           PERMS_READ, 8 /* l */ },
 521
 522         /* FULL without inheritance -- in all cases here we also get
 523            the corresponding INHERIT_ONLY ACE in the same ACL */
 524         { 0, 0, PERMS_FULL, 127 /* rlidwka */ },
 525
 526         /* FULL inherit only -- counterpart to previous one */
 527         { 0, SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_INHERIT_ONLY,
 528           PERMS_FULL | SEC_GENERIC_WRITE, 127 /* rlidwka */ },
 529
 530         /* CHANGE without inheritance -- in all cases here we also get
 531            the corresponding INHERIT_ONLY ACE in the same ACL */
 532         { 0, 0, PERMS_CHANGE, 63 /* rlidwk */ },
 533
 534         /* CHANGE inherit only -- counterpart to previous one */
 535         { 0, SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_INHERIT_ONLY,
 536           PERMS_CHANGE | SEC_GENERIC_WRITE, 63 /* rlidwk */ },
 537
 538         /* End marker, hopefully there's no afs right 9999 :-) */
 539         { 0, 0, 0, 9999 }
 540 };
 541
 542 static uint32 nt_to_afs_dir_rights(const char *filename, const struct security_ace *ace)
 543 {
 544         uint32 result = 0;
 545         uint32 rights = ace->access_mask;
 546         uint8 flags = ace->flags;
 547
 548         struct static_dir_ace_mapping *m;
 549
 550         for (m = &ace_mappings[0]; m->afs_rights != 9999; m++) {
 551                 if ( (ace->type == m->type) &&
 552                      (ace->flags == m->flags) &&
 553                      (ace->access_mask == m->mask) )
 554                         return m->afs_rights;
 555         }
 556
 557         DEBUG(1, ("AFSACL FALLBACK: 0x%X 0x%X 0x%X %s %X\n",
 558                   ace->type, ace->flags, ace->access_mask, filename, rights));
 559
 560         if (rights & (GENERIC_ALL_ACCESS|WRITE_DAC_ACCESS)) {
 561                 result |= PRSFS_READ | PRSFS_WRITE | PRSFS_INSERT |
 562                         PRSFS_LOOKUP | PRSFS_DELETE | PRSFS_LOCK |
 563                         PRSFS_ADMINISTER;
 564         }
 565
 566         if (rights & (GENERIC_READ_ACCESS|FILE_READ_DATA)) {
 567                 result |= PRSFS_LOOKUP;
 568                 if (flags & SEC_ACE_FLAG_OBJECT_INHERIT) {
 569                         result |= PRSFS_READ;
 570                 }
 571         }
 572
 573         if (rights & (GENERIC_WRITE_ACCESS|FILE_WRITE_DATA)) {
 574                 result |= PRSFS_INSERT | PRSFS_DELETE;
 575                 if (flags & SEC_ACE_FLAG_OBJECT_INHERIT) {
 576                         result |= PRSFS_WRITE | PRSFS_LOCK;
 577                 }
 578         }
 579
 580         return result;
 581 }
 582
 583 static uint32 nt_to_afs_file_rights(const char *filename, const struct security_ace *ace)
 584 {
 585         uint32 result = 0;
 586         uint32 rights = ace->access_mask;
 587
 588         if (rights & (GENERIC_READ_ACCESS|FILE_READ_DATA)) {
 589                 result |= PRSFS_READ;
 590         }
 591
 592         if (rights & (GENERIC_WRITE_ACCESS|FILE_WRITE_DATA)) {
 593                 result |= PRSFS_WRITE | PRSFS_LOCK;
 594         }
 595
 596         return result;
 597 }
 598
 599 static size_t afs_to_nt_acl_common(struct afs_acl *afs_acl,
 600                                    SMB_STRUCT_STAT *psbuf,
 601                                    uint32 security_info,
 602                                    struct security_descriptor **ppdesc)
 603 {
 604         struct security_ace *nt_ace_list;
 605         struct dom_sid owner_sid, group_sid;
 606         struct security_acl *psa = NULL;
 607         int good_aces;
 608         size_t sd_size;
 609         TALLOC_CTX *mem_ctx = talloc_tos();
 610
 611         struct afs_ace *afs_ace;
 612
 613         uid_to_sid(&owner_sid, psbuf->st_ex_uid);
 614         gid_to_sid(&group_sid, psbuf->st_ex_gid);
 615
 616         if (afs_acl->num_aces) {
 617                 nt_ace_list = talloc_array(mem_ctx, struct security_ace, afs_acl->num_aces);
 618
 619                 if (nt_ace_list == NULL)
 620                         return 0;
 621         } else {
 622                 nt_ace_list = NULL;
 623         }
 624
 625         afs_ace = afs_acl->acelist;
 626         good_aces = 0;
 627
 628         while (afs_ace != NULL) {
 629                 uint32_t nt_rights;
 630                 uint8 flag = SEC_ACE_FLAG_OBJECT_INHERIT |
 631                         SEC_ACE_FLAG_CONTAINER_INHERIT;
 632
 633                 if (afs_ace->type == SID_NAME_UNKNOWN) {
 634                         DEBUG(10, ("Ignoring unknown name %s\n",
 635                                    afs_ace->name));
 636                         afs_ace = afs_ace->next;
 637                         continue;
 638                 }
 639
 640                 if (S_ISDIR(psbuf->st_ex_mode))
 641                         afs_to_nt_dir_rights(afs_ace->rights, &nt_rights,
 642                                              &flag);
 643                 else
 644                         nt_rights = afs_to_nt_file_rights(afs_ace->rights);
 645
 646                 init_sec_ace(&nt_ace_list[good_aces++], &(afs_ace->sid),
 647                              SEC_ACE_TYPE_ACCESS_ALLOWED, nt_rights, flag);
 648                 afs_ace = afs_ace->next;
 649         }
 650
 651         psa = make_sec_acl(mem_ctx, NT4_ACL_REVISION,
 652                            good_aces, nt_ace_list);
 653         if (psa == NULL)
 654                 return 0;
 655
 656         *ppdesc = make_sec_desc(mem_ctx, SD_REVISION,
 657                                 SEC_DESC_SELF_RELATIVE,
 658                                 (security_info & SECINFO_OWNER)
 659                                 ? &owner_sid : NULL,
 660                                 (security_info & SECINFO_GROUP)
 661                                 ? &group_sid : NULL,
 662                                 NULL, psa, &sd_size);
 663
 664         return sd_size;
 665 }
 666
 667 static size_t afs_to_nt_acl(struct afs_acl *afs_acl,
 668                             struct connection_struct *conn,
 669                             struct smb_filename *smb_fname,
 670                             uint32 security_info,
 671                             struct security_descriptor **ppdesc)
 672 {
 673         int ret;
 674
 675         /* Get the stat struct for the owner info. */
 676         if (lp_posix_pathnames()) {
 677                 ret = SMB_VFS_LSTAT(conn, smb_fname);
 678         } else {
 679                 ret = SMB_VFS_STAT(conn, smb_fname);
 680         }
 681         if (ret == -1) {
 682                 return 0;
 683         }
 684
 685         return afs_to_nt_acl_common(afs_acl, &smb_fname->st, security_info,
 686                                     ppdesc);
 687 }
 688
 689 static size_t afs_fto_nt_acl(struct afs_acl *afs_acl,
 690                              struct files_struct *fsp,
 691                              uint32 security_info,
 692                              struct security_descriptor **ppdesc)
 693 {
 694         SMB_STRUCT_STAT sbuf;
 695
 696         if (fsp->fh->fd == -1) {
 697                 /* Get the stat struct for the owner info. */
 698                 return afs_to_nt_acl(afs_acl, fsp->conn, fsp->fsp_name,
 699                                      security_info, ppdesc);
 700         }
 701
 702         if(SMB_VFS_FSTAT(fsp, &sbuf) != 0) {
 703                 return 0;
 704         }
 705
 706         return afs_to_nt_acl_common(afs_acl, &sbuf, security_info, ppdesc);
 707 }
 708
 709 static bool mappable_sid(const struct dom_sid *sid)
 710 {
 711         struct dom_sid domain_sid;
 712
 713         if (dom_sid_compare(sid, &global_sid_Builtin_Administrators) == 0)
 714                 return true;
 715
 716         if (dom_sid_compare(sid, &global_sid_World) == 0)
 717                 return true;
 718
 719         if (dom_sid_compare(sid, &global_sid_Authenticated_Users) == 0)
 720                 return true;
 721
 722         if (dom_sid_compare(sid, &global_sid_Builtin_Backup_Operators) == 0)
 723                 return true;
 724
 725         string_to_sid(&domain_sid, "S-1-5-21");
 726
 727         if (sid_compare_domain(sid, &domain_sid) == 0)
 728                 return true;
 729
 730         return false;
 731 }
 732
 733 static bool nt_to_afs_acl(const char *filename,
 734                           uint32 security_info_sent,
 735                           const struct security_descriptor *psd,
 736                           uint32 (*nt_to_afs_rights)(const char *filename,
 737                                                      const struct security_ace *ace),
 738                           struct afs_acl *afs_acl)
 739 {
 740         const struct security_acl *dacl;
 741         int i;
 742
 743         /* Currently we *only* look at the dacl */
 744
 745         if (((security_info_sent & SECINFO_DACL) == 0) ||
 746             (psd->dacl == NULL))
 747                 return true;
 748
 749         if (!init_afs_acl(afs_acl))
 750                 return false;
 751
 752         dacl = psd->dacl;
 753
 754         for (i = 0; i < dacl->num_aces; i++) {
 755                 const struct security_ace *ace = &(dacl->aces[i]);
 756                 const char *dom_name, *name;
 757                 enum lsa_SidType name_type;
 758                 char *p;
 759
 760                 if (ace->type != SEC_ACE_TYPE_ACCESS_ALLOWED) {
 761                         /* First cut: Only positive ACEs */
 762                         return false;
 763                 }
 764
 765                 if (!mappable_sid(&ace->trustee)) {
 766                         DEBUG(10, ("Ignoring unmappable SID %s\n",
 767                                    sid_string_dbg(&ace->trustee)));
 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                                 DEBUG(1, ("AFSACL: Could not lookup SID %s on file %s\n",
 797                                           sid_string_dbg(&ace->trustee),
 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                                 strlower_m(tmp);
 813                                 name = tmp;
 814                         }
 815
 816                         if (sidpts) {
 817                                 /* Expect all users/groups in pts as SIDs */
 818                                 name = talloc_strdup(
 819                                         talloc_tos(),
 820                                         sid_string_tos(&ace->trustee));
 821                                 if (name == NULL) {
 822                                         return false;
 823                                 }
 824                         }
 825                 }
 826
 827                 while ((p = strchr_m(name, ' ')) != NULL)
 828                         *p = space_replacement;
 829
 830                 add_afs_ace(afs_acl, true, name,
 831                             nt_to_afs_rights(filename, ace));
 832         }
 833
 834         return true;
 835 }
 836
 837 static bool afs_get_afs_acl(const char *filename, struct afs_acl *acl)
 838 {
 839         struct afs_iob iob;
 840
 841         int ret;
 842
 843         char space[MAXSIZE];
 844
 845         DEBUG(5, ("afs_get_afs_acl: %s\n", filename));
 846
 847         iob.in_size = 0;
 848         iob.out_size = MAXSIZE;
 849         iob.in = iob.out = space;
 850
 851         ret = afs_syscall(AFSCALL_PIOCTL, filename, VIOCGETAL,
 852                           (char *)&iob, 0);
 853
 854         if (ret) {
 855                 DEBUG(1, ("got error from PIOCTL: %d\n", ret));
 856                 return false;
 857         }
 858
 859         if (!init_afs_acl(acl))
 860                 return false;
 861
 862         if (!parse_afs_acl(acl, space)) {
 863                 DEBUG(1, ("Could not parse AFS acl\n"));
 864                 free_afs_acl(acl);
 865                 return false;
 866         }
 867
 868         return true;
 869 }
 870
 871 /* For setting an AFS ACL we have to take care of the ACEs we could
 872  * not properly map to SIDs. Merge all of them into the new ACL. */
 873
 874 static void merge_unknown_aces(struct afs_acl *src, struct afs_acl *dst)
 875 {
 876         struct afs_ace *ace;
 877
 878         for (ace = src->acelist; ace != NULL; ace = ace->next)
 879         {
 880                 struct afs_ace *copy;
 881
 882                 if (ace->type != SID_NAME_UNKNOWN) {
 883                         DEBUG(10, ("Not merging known ACE for %s\n",
 884                                    ace->name));
 885                         continue;
 886                 }
 887
 888                 DEBUG(10, ("Merging unknown ACE for %s\n", ace->name));
 889
 890                 copy = clone_afs_ace(dst->ctx, ace);
 891
 892                 if (copy == NULL) {
 893                         DEBUG(0, ("Could not clone ACE for %s\n", ace->name));
 894                         continue;
 895                 }
 896
 897                 copy->next = dst->acelist;
 898                 dst->acelist = copy;
 899                 dst->num_aces += 1;
 900         }
 901 }
 902
 903 static NTSTATUS afs_set_nt_acl(vfs_handle_struct *handle, files_struct *fsp,
 904                            uint32 security_info_sent,
 905                            const struct security_descriptor *psd)
 906 {
 907         struct afs_acl old_afs_acl, new_afs_acl;
 908         struct afs_acl dir_acl, file_acl;
 909         char acl_string[MAXSIZE];
 910         struct afs_iob iob;
 911         int ret = -1;
 912         char *name = NULL;
 913         const char *fileacls;
 914
 915         fileacls = lp_parm_const_string(SNUM(handle->conn), "afsacl", "fileacls",
 916                                         "yes");
 917
 918         sidpts = lp_parm_bool(SNUM(handle->conn), "afsacl", "sidpts", false);
 919
 920         ZERO_STRUCT(old_afs_acl);
 921         ZERO_STRUCT(new_afs_acl);
 922         ZERO_STRUCT(dir_acl);
 923         ZERO_STRUCT(file_acl);
 924
 925         name = talloc_strdup(talloc_tos(), fsp->fsp_name->base_name);
 926         if (!name) {
 927                 return NT_STATUS_NO_MEMORY;
 928         }
 929
 930         if (!fsp->is_directory) {
 931                 /* We need to get the name of the directory containing the
 932                  * file, this is where the AFS acls live */
 933                 char *p = strrchr(name, '/');
 934                 if (p != NULL) {
 935                         *p = '\0';
 936                 } else {
 937                         name = talloc_strdup(talloc_tos(), ".");
 938                         if (!name) {
 939                                 return NT_STATUS_NO_MEMORY;
 940                         }
 941                 }
 942         }
 943
 944         if (!afs_get_afs_acl(name, &old_afs_acl)) {
 945                 DEBUG(3, ("Could not get old ACL of %s\n", fsp_str_dbg(fsp)));
 946                 goto done;
 947         }
 948
 949         split_afs_acl(&old_afs_acl, &dir_acl, &file_acl);
 950
 951         if (fsp->is_directory) {
 952
 953                 if (!strequal(fileacls, "yes")) {
 954                         /* Throw away file acls, we depend on the
 955                          * inheritance ACEs that also give us file
 956                          * permissions */
 957                         free_afs_acl(&file_acl);
 958                 }
 959
 960                 free_afs_acl(&dir_acl);
 961                 if (!nt_to_afs_acl(fsp->fsp_name->base_name,
 962                                    security_info_sent, psd,
 963                                    nt_to_afs_dir_rights, &dir_acl))
 964                         goto done;
 965         } else {
 966                 if (strequal(fileacls, "no")) {
 967                         ret = -1;
 968                         goto done;
 969                 }
 970
 971                 if (strequal(fileacls, "ignore")) {
 972                         ret = 0;
 973                         goto done;
 974                 }
 975
 976                 free_afs_acl(&file_acl);
 977                 if (!nt_to_afs_acl(fsp->fsp_name->base_name,
 978                                    security_info_sent, psd,
 979                                    nt_to_afs_file_rights, &file_acl))
 980                         goto done;
 981         }
 982
 983         merge_afs_acls(&dir_acl, &file_acl, &new_afs_acl);
 984
 985         merge_unknown_aces(&old_afs_acl, &new_afs_acl);
 986
 987         unparse_afs_acl(&new_afs_acl, acl_string);
 988
 989         iob.in = acl_string;
 990         iob.in_size = 1+strlen(iob.in);
 991         iob.out = NULL;
 992         iob.out_size = 0;
 993
 994         DEBUG(10, ("trying to set acl '%s' on file %s\n", iob.in, name));
 995
 996         ret = afs_syscall(AFSCALL_PIOCTL, name, VIOCSETAL, (char *)&iob, 0);
 997
 998         if (ret != 0) {
 999                 DEBUG(10, ("VIOCSETAL returned %d\n", ret));
1000         }
1001
1002  done:
1003         free_afs_acl(&dir_acl);
1004         free_afs_acl(&file_acl);
1005         free_afs_acl(&old_afs_acl);
1006         free_afs_acl(&new_afs_acl);
1007
1008         return (ret == 0) ? NT_STATUS_OK : NT_STATUS_ACCESS_DENIED;
1009 }
1010
1011 static NTSTATUS afsacl_fget_nt_acl(struct vfs_handle_struct *handle,
1012                                    struct files_struct *fsp,
1013                                    uint32 security_info,
1014                                    struct security_descriptor **ppdesc)
1015 {
1016         struct afs_acl acl;
1017         size_t sd_size;
1018
1019         DEBUG(5, ("afsacl_fget_nt_acl: %s\n", fsp_str_dbg(fsp)));
1020
1021         sidpts = lp_parm_bool(SNUM(fsp->conn), "afsacl", "sidpts", false);
1022
1023         if (!afs_get_afs_acl(fsp->fsp_name->base_name, &acl)) {
1024                 return NT_STATUS_ACCESS_DENIED;
1025         }
1026
1027         sd_size = afs_fto_nt_acl(&acl, fsp, security_info, ppdesc);
1028
1029         free_afs_acl(&acl);
1030
1031         return (sd_size != 0) ? NT_STATUS_OK : NT_STATUS_ACCESS_DENIED;
1032 }
1033
1034 static NTSTATUS afsacl_get_nt_acl(struct vfs_handle_struct *handle,
1035                                   const char *name,  uint32 security_info,
1036                                   struct security_descriptor **ppdesc)
1037 {
1038         struct afs_acl acl;
1039         size_t sd_size;
1040         struct smb_filename *smb_fname = NULL;
1041         NTSTATUS status;
1042
1043         DEBUG(5, ("afsacl_get_nt_acl: %s\n", name));
1044
1045         sidpts = lp_parm_bool(SNUM(handle->conn), "afsacl", "sidpts", false);
1046
1047         if (!afs_get_afs_acl(name, &acl)) {
1048                 return NT_STATUS_ACCESS_DENIED;
1049         }
1050
1051         status = create_synthetic_smb_fname(talloc_tos(), name, NULL, NULL,
1052                                             &smb_fname);
1053         if (!NT_STATUS_IS_OK(status)) {
1054                 free_afs_acl(&acl);
1055                 return status;
1056         }
1057
1058         sd_size = afs_to_nt_acl(&acl, handle->conn, smb_fname, security_info,
1059                                 ppdesc);
1060         TALLOC_FREE(smb_fname);
1061
1062         free_afs_acl(&acl);
1063
1064         return (sd_size != 0) ? NT_STATUS_OK : NT_STATUS_ACCESS_DENIED;
1065 }
1066
1067 NTSTATUS afsacl_fset_nt_acl(vfs_handle_struct *handle,
1068                          files_struct *fsp,
1069                          uint32 security_info_sent,
1070                          const struct security_descriptor *psd)
1071 {
1072         return afs_set_nt_acl(handle, fsp, security_info_sent, psd);
1073 }
1074
1075 static int afsacl_connect(vfs_handle_struct *handle,
1076                           const char *service,
1077                           const char *user)
1078 {
1079         const char *spc;
1080         int ret = SMB_VFS_NEXT_CONNECT(handle, service, user);
1081
1082         if (ret < 0) {
1083                 return ret;
1084         }
1085
1086         spc = lp_parm_const_string(SNUM(handle->conn), "afsacl", "space", "%");
1087
1088         if (spc != NULL)
1089                 space_replacement = spc[0];
1090
1091         return 0;
1092 }
1093
1094 static struct vfs_fn_pointers vfs_afsacl_fns = {
1095         .connect_fn = afsacl_connect,
1096         .fget_nt_acl_fn = afsacl_fget_nt_acl,
1097         .get_nt_acl_fn = afsacl_get_nt_acl,
1098         .fset_nt_acl_fn = afsacl_fset_nt_acl
1099 };
1100
1101 NTSTATUS vfs_afsacl_init(void);
1102 NTSTATUS vfs_afsacl_init(void)
1103 {
1104         return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "afsacl",
1105                                 &vfs_afsacl_fns);
1106 }