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         strlcat(acl_str, line, MAXSIZE);
 320
 321         fstr_sprintf(line, "%d\n", negatives);
 322         strlcat(acl_str, line, MAXSIZE);
 323
 324         ace = acl->acelist;
 325
 326         while (ace != NULL) {
 327                 fstr_sprintf(line, "%s\t%d\n", ace->name, ace->rights);
 328                 strlcat(acl_str, line, MAXSIZE);
 329                 ace = ace->next;
 330         }
 331         return true;
 332 }
 333
 334 static uint32 afs_to_nt_file_rights(uint32 rights)
 335 {
 336         uint32 result = 0;
 337
 338         if (rights & PRSFS_READ)
 339                 result |= FILE_READ_DATA | FILE_READ_EA |
 340                         FILE_EXECUTE | FILE_READ_ATTRIBUTES |
 341                         READ_CONTROL_ACCESS | SYNCHRONIZE_ACCESS;
 342
 343         if (rights & PRSFS_WRITE)
 344                 result |= FILE_WRITE_DATA | FILE_WRITE_ATTRIBUTES |
 345                         FILE_WRITE_EA | FILE_APPEND_DATA;
 346
 347         if (rights & PRSFS_LOCK)
 348                 result |= WRITE_OWNER_ACCESS;
 349
 350         if (rights & PRSFS_DELETE)
 351                 result |= DELETE_ACCESS;
 352
 353         return result;
 354 }
 355
 356 static void afs_to_nt_dir_rights(uint32 afs_rights, uint32 *nt_rights,
 357                                  uint8 *flag)
 358 {
 359         *nt_rights = 0;
 360         *flag = SEC_ACE_FLAG_OBJECT_INHERIT |
 361                 SEC_ACE_FLAG_CONTAINER_INHERIT;
 362
 363         if (afs_rights & PRSFS_INSERT)
 364                 *nt_rights |= FILE_ADD_FILE | FILE_ADD_SUBDIRECTORY;
 365
 366         if (afs_rights & PRSFS_LOOKUP)
 367                 *nt_rights |= FILE_READ_DATA | FILE_READ_EA |
 368                         FILE_EXECUTE | FILE_READ_ATTRIBUTES |
 369                         READ_CONTROL_ACCESS | SYNCHRONIZE_ACCESS;
 370
 371         if (afs_rights & PRSFS_WRITE)
 372                 *nt_rights |= FILE_WRITE_ATTRIBUTES | FILE_WRITE_DATA |
 373                         FILE_APPEND_DATA | FILE_WRITE_EA;
 374
 375         if ((afs_rights & (PRSFS_INSERT|PRSFS_LOOKUP|PRSFS_DELETE)) ==
 376             (PRSFS_INSERT|PRSFS_LOOKUP|PRSFS_DELETE))
 377                 *nt_rights |= FILE_WRITE_ATTRIBUTES | FILE_WRITE_EA |
 378                         GENERIC_WRITE_ACCESS;
 379
 380         if (afs_rights & PRSFS_DELETE)
 381                 *nt_rights |= DELETE_ACCESS;
 382
 383         if (afs_rights & PRSFS_ADMINISTER)
 384                 *nt_rights |= FILE_DELETE_CHILD | WRITE_DAC_ACCESS |
 385                         WRITE_OWNER_ACCESS;
 386
 387         if ( (afs_rights & PRSFS_LOOKUP) ==
 388              (afs_rights & (PRSFS_LOOKUP|PRSFS_READ)) ) {
 389                 /* Only lookup right */
 390                 *flag = SEC_ACE_FLAG_CONTAINER_INHERIT;
 391         }
 392
 393         return;
 394 }
 395
 396 #define AFS_FILE_RIGHTS (PRSFS_READ|PRSFS_WRITE|PRSFS_LOCK)
 397 #define AFS_DIR_RIGHTS  (PRSFS_INSERT|PRSFS_LOOKUP|PRSFS_DELETE|PRSFS_ADMINISTER)
 398
 399 static void split_afs_acl(struct afs_acl *acl,
 400                           struct afs_acl *dir_acl,
 401                           struct afs_acl *file_acl)
 402 {
 403         struct afs_ace *ace;
 404
 405         init_afs_acl(dir_acl);
 406         init_afs_acl(file_acl);
 407
 408         for (ace = acl->acelist; ace != NULL; ace = ace->next) {
 409                 if (ace->rights & AFS_FILE_RIGHTS) {
 410                         add_afs_ace(file_acl, ace->positive, ace->name,
 411                                     ace->rights & AFS_FILE_RIGHTS);
 412                 }
 413
 414                 if (ace->rights & AFS_DIR_RIGHTS) {
 415                         add_afs_ace(dir_acl, ace->positive, ace->name,
 416                                     ace->rights & AFS_DIR_RIGHTS);
 417                 }
 418         }
 419         return;
 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 type;
 480         uint8 flags;
 481         uint32 mask;
 482         uint32 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 nt_to_afs_dir_rights(const char *filename, const struct security_ace *ace)
 537 {
 538         uint32 result = 0;
 539         uint32 rights = ace->access_mask;
 540         uint8 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 nt_to_afs_file_rights(const char *filename, const struct security_ace *ace)
 578 {
 579         uint32 result = 0;
 580         uint32 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 security_info,
 596                                    struct security_descriptor **ppdesc)
 597 {
 598         struct security_ace *nt_ace_list;
 599         struct dom_sid owner_sid, group_sid;
 600         struct security_acl *psa = NULL;
 601         int good_aces;
 602         size_t sd_size;
 603         TALLOC_CTX *mem_ctx = talloc_tos();
 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 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 security_info,
 665                             struct security_descriptor **ppdesc)
 666 {
 667         int ret;
 668
 669         /* Get the stat struct for the owner info. */
 670         if (lp_posix_pathnames()) {
 671                 ret = SMB_VFS_LSTAT(conn, smb_fname);
 672         } else {
 673                 ret = SMB_VFS_STAT(conn, smb_fname);
 674         }
 675         if (ret == -1) {
 676                 return 0;
 677         }
 678
 679         return afs_to_nt_acl_common(afs_acl, &smb_fname->st, security_info,
 680                                     ppdesc);
 681 }
 682
 683 static size_t afs_fto_nt_acl(struct afs_acl *afs_acl,
 684                              struct files_struct *fsp,
 685                              uint32 security_info,
 686                              struct security_descriptor **ppdesc)
 687 {
 688         SMB_STRUCT_STAT sbuf;
 689
 690         if (fsp->fh->fd == -1) {
 691                 /* Get the stat struct for the owner info. */
 692                 return afs_to_nt_acl(afs_acl, fsp->conn, fsp->fsp_name,
 693                                      security_info, ppdesc);
 694         }
 695
 696         if(SMB_VFS_FSTAT(fsp, &sbuf) != 0) {
 697                 return 0;
 698         }
 699
 700         return afs_to_nt_acl_common(afs_acl, &sbuf, security_info, ppdesc);
 701 }
 702
 703 static bool mappable_sid(const struct dom_sid *sid)
 704 {
 705         struct dom_sid domain_sid;
 706
 707         if (dom_sid_compare(sid, &global_sid_Builtin_Administrators) == 0)
 708                 return true;
 709
 710         if (dom_sid_compare(sid, &global_sid_World) == 0)
 711                 return true;
 712
 713         if (dom_sid_compare(sid, &global_sid_Authenticated_Users) == 0)
 714                 return true;
 715
 716         if (dom_sid_compare(sid, &global_sid_Builtin_Backup_Operators) == 0)
 717                 return true;
 718
 719         string_to_sid(&domain_sid, "S-1-5-21");
 720
 721         if (sid_compare_domain(sid, &domain_sid) == 0)
 722                 return true;
 723
 724         return false;
 725 }
 726
 727 static bool nt_to_afs_acl(const char *filename,
 728                           uint32 security_info_sent,
 729                           const struct security_descriptor *psd,
 730                           uint32 (*nt_to_afs_rights)(const char *filename,
 731                                                      const struct security_ace *ace),
 732                           struct afs_acl *afs_acl)
 733 {
 734         const struct security_acl *dacl;
 735         int i;
 736
 737         /* Currently we *only* look at the dacl */
 738
 739         if (((security_info_sent & SECINFO_DACL) == 0) ||
 740             (psd->dacl == NULL))
 741                 return true;
 742
 743         if (!init_afs_acl(afs_acl))
 744                 return false;
 745
 746         dacl = psd->dacl;
 747
 748         for (i = 0; i < dacl->num_aces; i++) {
 749                 const struct security_ace *ace = &(dacl->aces[i]);
 750                 const char *dom_name, *name;
 751                 enum lsa_SidType name_type;
 752                 char *p;
 753
 754                 if (ace->type != SEC_ACE_TYPE_ACCESS_ALLOWED) {
 755                         /* First cut: Only positive ACEs */
 756                         return false;
 757                 }
 758
 759                 if (!mappable_sid(&ace->trustee)) {
 760                         DEBUG(10, ("Ignoring unmappable SID %s\n",
 761                                    sid_string_dbg(&ace->trustee)));
 762                         continue;
 763                 }
 764
 765                 if (dom_sid_compare(&ace->trustee,
 766                                 &global_sid_Builtin_Administrators) == 0) {
 767
 768                         name = "system:administrators";
 769
 770                 } else if (dom_sid_compare(&ace->trustee,
 771                                        &global_sid_World) == 0) {
 772
 773                         name = "system:anyuser";
 774
 775                 } else if (dom_sid_compare(&ace->trustee,
 776                                        &global_sid_Authenticated_Users) == 0) {
 777
 778                         name = "system:authuser";
 779
 780                 } else if (dom_sid_compare(&ace->trustee,
 781                                        &global_sid_Builtin_Backup_Operators)
 782                            == 0) {
 783
 784                         name = "system:backup";
 785
 786                 } else {
 787
 788                         if (!lookup_sid(talloc_tos(), &ace->trustee,
 789                                         &dom_name, &name, &name_type)) {
 790                                 DEBUG(1, ("AFSACL: Could not lookup SID %s on file %s\n",
 791                                           sid_string_dbg(&ace->trustee),
 792                                           filename));
 793                                 continue;
 794                         }
 795
 796                         if ( (name_type == SID_NAME_USER) ||
 797                              (name_type == SID_NAME_DOM_GRP) ||
 798                              (name_type == SID_NAME_ALIAS) ) {
 799                                 char *tmp;
 800                                 tmp = talloc_asprintf(talloc_tos(), "%s%s%s",
 801                                                        dom_name, lp_winbind_separator(),
 802                                                        name);
 803                                 if (tmp == NULL) {
 804                                         return false;
 805                                 }
 806                                 strlower_m(tmp);
 807                                 name = tmp;
 808                         }
 809
 810                         if (sidpts) {
 811                                 /* Expect all users/groups in pts as SIDs */
 812                                 name = talloc_strdup(
 813                                         talloc_tos(),
 814                                         sid_string_tos(&ace->trustee));
 815                                 if (name == NULL) {
 816                                         return false;
 817                                 }
 818                         }
 819                 }
 820
 821                 while ((p = strchr_m(name, ' ')) != NULL)
 822                         *p = space_replacement;
 823
 824                 add_afs_ace(afs_acl, true, name,
 825                             nt_to_afs_rights(filename, ace));
 826         }
 827
 828         return true;
 829 }
 830
 831 static bool afs_get_afs_acl(const char *filename, struct afs_acl *acl)
 832 {
 833         struct afs_iob iob;
 834
 835         int ret;
 836
 837         char space[MAXSIZE];
 838
 839         DEBUG(5, ("afs_get_afs_acl: %s\n", filename));
 840
 841         iob.in_size = 0;
 842         iob.out_size = MAXSIZE;
 843         iob.in = iob.out = space;
 844
 845         ret = afs_syscall(AFSCALL_PIOCTL, filename, VIOCGETAL,
 846                           (char *)&iob, 0);
 847
 848         if (ret) {
 849                 DEBUG(1, ("got error from PIOCTL: %d\n", ret));
 850                 return false;
 851         }
 852
 853         if (!init_afs_acl(acl))
 854                 return false;
 855
 856         if (!parse_afs_acl(acl, space)) {
 857                 DEBUG(1, ("Could not parse AFS acl\n"));
 858                 free_afs_acl(acl);
 859                 return false;
 860         }
 861
 862         return true;
 863 }
 864
 865 /* For setting an AFS ACL we have to take care of the ACEs we could
 866  * not properly map to SIDs. Merge all of them into the new ACL. */
 867
 868 static void merge_unknown_aces(struct afs_acl *src, struct afs_acl *dst)
 869 {
 870         struct afs_ace *ace;
 871
 872         for (ace = src->acelist; ace != NULL; ace = ace->next)
 873         {
 874                 struct afs_ace *copy;
 875
 876                 if (ace->type != SID_NAME_UNKNOWN) {
 877                         DEBUG(10, ("Not merging known ACE for %s\n",
 878                                    ace->name));
 879                         continue;
 880                 }
 881
 882                 DEBUG(10, ("Merging unknown ACE for %s\n", ace->name));
 883
 884                 copy = clone_afs_ace(dst->ctx, ace);
 885
 886                 if (copy == NULL) {
 887                         DEBUG(0, ("Could not clone ACE for %s\n", ace->name));
 888                         continue;
 889                 }
 890
 891                 copy->next = dst->acelist;
 892                 dst->acelist = copy;
 893                 dst->num_aces += 1;
 894         }
 895 }
 896
 897 static NTSTATUS afs_set_nt_acl(vfs_handle_struct *handle, files_struct *fsp,
 898                            uint32 security_info_sent,
 899                            const struct security_descriptor *psd)
 900 {
 901         struct afs_acl old_afs_acl, new_afs_acl;
 902         struct afs_acl dir_acl, file_acl;
 903         char acl_string[MAXSIZE];
 904         struct afs_iob iob;
 905         int ret = -1;
 906         char *name = NULL;
 907         const char *fileacls;
 908
 909         fileacls = lp_parm_const_string(SNUM(handle->conn), "afsacl", "fileacls",
 910                                         "yes");
 911
 912         sidpts = lp_parm_bool(SNUM(handle->conn), "afsacl", "sidpts", false);
 913
 914         ZERO_STRUCT(old_afs_acl);
 915         ZERO_STRUCT(new_afs_acl);
 916         ZERO_STRUCT(dir_acl);
 917         ZERO_STRUCT(file_acl);
 918
 919         name = talloc_strdup(talloc_tos(), fsp->fsp_name->base_name);
 920         if (!name) {
 921                 return NT_STATUS_NO_MEMORY;
 922         }
 923
 924         if (!fsp->is_directory) {
 925                 /* We need to get the name of the directory containing the
 926                  * file, this is where the AFS acls live */
 927                 char *p = strrchr(name, '/');
 928                 if (p != NULL) {
 929                         *p = '\0';
 930                 } else {
 931                         name = talloc_strdup(talloc_tos(), ".");
 932                         if (!name) {
 933                                 return NT_STATUS_NO_MEMORY;
 934                         }
 935                 }
 936         }
 937
 938         if (!afs_get_afs_acl(name, &old_afs_acl)) {
 939                 DEBUG(3, ("Could not get old ACL of %s\n", fsp_str_dbg(fsp)));
 940                 goto done;
 941         }
 942
 943         split_afs_acl(&old_afs_acl, &dir_acl, &file_acl);
 944
 945         if (fsp->is_directory) {
 946
 947                 if (!strequal(fileacls, "yes")) {
 948                         /* Throw away file acls, we depend on the
 949                          * inheritance ACEs that also give us file
 950                          * permissions */
 951                         free_afs_acl(&file_acl);
 952                 }
 953
 954                 free_afs_acl(&dir_acl);
 955                 if (!nt_to_afs_acl(fsp->fsp_name->base_name,
 956                                    security_info_sent, psd,
 957                                    nt_to_afs_dir_rights, &dir_acl))
 958                         goto done;
 959         } else {
 960                 if (strequal(fileacls, "no")) {
 961                         ret = -1;
 962                         goto done;
 963                 }
 964
 965                 if (strequal(fileacls, "ignore")) {
 966                         ret = 0;
 967                         goto done;
 968                 }
 969
 970                 free_afs_acl(&file_acl);
 971                 if (!nt_to_afs_acl(fsp->fsp_name->base_name,
 972                                    security_info_sent, psd,
 973                                    nt_to_afs_file_rights, &file_acl))
 974                         goto done;
 975         }
 976
 977         merge_afs_acls(&dir_acl, &file_acl, &new_afs_acl);
 978
 979         merge_unknown_aces(&old_afs_acl, &new_afs_acl);
 980
 981         unparse_afs_acl(&new_afs_acl, acl_string);
 982
 983         iob.in = acl_string;
 984         iob.in_size = 1+strlen(iob.in);
 985         iob.out = NULL;
 986         iob.out_size = 0;
 987
 988         DEBUG(10, ("trying to set acl '%s' on file %s\n", iob.in, name));
 989
 990         ret = afs_syscall(AFSCALL_PIOCTL, name, VIOCSETAL, (char *)&iob, 0);
 991
 992         if (ret != 0) {
 993                 DEBUG(10, ("VIOCSETAL returned %d\n", ret));
 994         }
 995
 996  done:
 997         free_afs_acl(&dir_acl);
 998         free_afs_acl(&file_acl);
 999         free_afs_acl(&old_afs_acl);
1000         free_afs_acl(&new_afs_acl);
1001
1002         return (ret == 0) ? NT_STATUS_OK : NT_STATUS_ACCESS_DENIED;
1003 }
1004
1005 static NTSTATUS afsacl_fget_nt_acl(struct vfs_handle_struct *handle,
1006                                    struct files_struct *fsp,
1007                                    uint32 security_info,
1008                                    struct security_descriptor **ppdesc)
1009 {
1010         struct afs_acl acl;
1011         size_t sd_size;
1012
1013         DEBUG(5, ("afsacl_fget_nt_acl: %s\n", fsp_str_dbg(fsp)));
1014
1015         sidpts = lp_parm_bool(SNUM(fsp->conn), "afsacl", "sidpts", false);
1016
1017         if (!afs_get_afs_acl(fsp->fsp_name->base_name, &acl)) {
1018                 return NT_STATUS_ACCESS_DENIED;
1019         }
1020
1021         sd_size = afs_fto_nt_acl(&acl, fsp, security_info, ppdesc);
1022
1023         free_afs_acl(&acl);
1024
1025         return (sd_size != 0) ? NT_STATUS_OK : NT_STATUS_ACCESS_DENIED;
1026 }
1027
1028 static NTSTATUS afsacl_get_nt_acl(struct vfs_handle_struct *handle,
1029                                   const char *name,  uint32 security_info,
1030                                   struct security_descriptor **ppdesc)
1031 {
1032         struct afs_acl acl;
1033         size_t sd_size;
1034         struct smb_filename *smb_fname = NULL;
1035         NTSTATUS status;
1036
1037         DEBUG(5, ("afsacl_get_nt_acl: %s\n", name));
1038
1039         sidpts = lp_parm_bool(SNUM(handle->conn), "afsacl", "sidpts", false);
1040
1041         if (!afs_get_afs_acl(name, &acl)) {
1042                 return NT_STATUS_ACCESS_DENIED;
1043         }
1044
1045         status = create_synthetic_smb_fname(talloc_tos(), name, NULL, NULL,
1046                                             &smb_fname);
1047         if (!NT_STATUS_IS_OK(status)) {
1048                 free_afs_acl(&acl);
1049                 return status;
1050         }
1051
1052         sd_size = afs_to_nt_acl(&acl, handle->conn, smb_fname, security_info,
1053                                 ppdesc);
1054         TALLOC_FREE(smb_fname);
1055
1056         free_afs_acl(&acl);
1057
1058         return (sd_size != 0) ? NT_STATUS_OK : NT_STATUS_ACCESS_DENIED;
1059 }
1060
1061 NTSTATUS afsacl_fset_nt_acl(vfs_handle_struct *handle,
1062                          files_struct *fsp,
1063                          uint32 security_info_sent,
1064                          const struct security_descriptor *psd)
1065 {
1066         return afs_set_nt_acl(handle, fsp, security_info_sent, psd);
1067 }
1068
1069 static int afsacl_connect(vfs_handle_struct *handle,
1070                           const char *service,
1071                           const char *user)
1072 {
1073         const char *spc;
1074         int ret = SMB_VFS_NEXT_CONNECT(handle, service, user);
1075
1076         if (ret < 0) {
1077                 return ret;
1078         }
1079
1080         spc = lp_parm_const_string(SNUM(handle->conn), "afsacl", "space", "%");
1081
1082         if (spc != NULL)
1083                 space_replacement = spc[0];
1084
1085         return 0;
1086 }
1087
1088 static struct vfs_fn_pointers vfs_afsacl_fns = {
1089         .connect_fn = afsacl_connect,
1090         .fget_nt_acl_fn = afsacl_fget_nt_acl,
1091         .get_nt_acl_fn = afsacl_get_nt_acl,
1092         .fset_nt_acl_fn = afsacl_fset_nt_acl
1093 };
1094
1095 NTSTATUS vfs_afsacl_init(void);
1096 NTSTATUS vfs_afsacl_init(void)
1097 {
1098         return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "afsacl",
1099                                 &vfs_afsacl_fns);
1100 }