source3/modules/nfs4_acls.c

   1 /*
   2  * NFS4 ACL handling
   3  *
   4  * Copyright (C) Jim McDonough, 2006
   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 "smbd/smbd.h"
  22 #include "nfs4_acls.h"
  23 #include "librpc/gen_ndr/ndr_security.h"
  24 #include "../libcli/security/dom_sid.h"
  25 #include "../libcli/security/security.h"
  26 #include "dbwrap/dbwrap.h"
  27 #include "dbwrap/dbwrap_open.h"
  28 #include "system/filesys.h"
  29 #include "passdb/lookup_sid.h"
  30 #include "util_tdb.h"
  31 #include "lib/param/loadparm.h"
  32
  33 #undef DBGC_CLASS
  34 #define DBGC_CLASS DBGC_ACLS
  35
  36 #define SMBACL4_PARAM_TYPE_NAME "nfs4"
  37
  38 extern const struct generic_mapping file_generic_mapping;
  39
  40 #define SMB_ACE4_INT_MAGIC 0x76F8A967
  41 typedef struct _SMB_ACE4_INT_T
  42 {
  43         uint32  magic;
  44         SMB_ACE4PROP_T  prop;
  45         void    *next;
  46 } SMB_ACE4_INT_T;
  47
  48 #define SMB_ACL4_INT_MAGIC 0x29A3E792
  49 typedef struct _SMB_ACL4_INT_T
  50 {
  51         uint32  magic;
  52         uint32  naces;
  53         SMB_ACE4_INT_T  *first;
  54         SMB_ACE4_INT_T  *last;
  55 } SMB_ACL4_INT_T;
  56
  57 /************************************************
  58  Split the ACE flag mapping between nfs4 and Windows
  59  into two separate functions rather than trying to do
  60  it inline. Allows us to carefully control what flags
  61  are mapped to what in one place.
  62 ************************************************/
  63
  64 static uint32_t map_nfs4_ace_flags_to_windows_ace_flags(
  65         uint32_t nfs4_ace_flags)
  66 {
  67         uint32_t win_ace_flags = 0;
  68
  69         /* The nfs4 flags <= 0xf map perfectly. */
  70         win_ace_flags = nfs4_ace_flags & (SEC_ACE_FLAG_OBJECT_INHERIT|
  71                                       SEC_ACE_FLAG_CONTAINER_INHERIT|
  72                                       SEC_ACE_FLAG_NO_PROPAGATE_INHERIT|
  73                                       SEC_ACE_FLAG_INHERIT_ONLY);
  74
  75         /* flags greater than 0xf have diverged :-(. */
  76         /* See the nfs4 ace flag definitions here:
  77            http://www.ietf.org/rfc/rfc3530.txt.
  78            And the Windows ace flag definitions here:
  79            librpc/idl/security.idl. */
  80         if (nfs4_ace_flags & SMB_ACE4_INHERITED_ACE) {
  81                 win_ace_flags |= SEC_ACE_FLAG_INHERITED_ACE;
  82         }
  83
  84         return win_ace_flags;
  85 }
  86
  87 static uint32_t map_windows_ace_flags_to_nfs4_ace_flags(uint32_t win_ace_flags)
  88 {
  89         uint32_t nfs4_ace_flags = 0;
  90
  91         /* The windows flags <= 0xf map perfectly. */
  92         nfs4_ace_flags = win_ace_flags & (SMB_ACE4_FILE_INHERIT_ACE|
  93                                       SMB_ACE4_DIRECTORY_INHERIT_ACE|
  94                                       SMB_ACE4_NO_PROPAGATE_INHERIT_ACE|
  95                                       SMB_ACE4_INHERIT_ONLY_ACE);
  96
  97         /* flags greater than 0xf have diverged :-(. */
  98         /* See the nfs4 ace flag definitions here:
  99            http://www.ietf.org/rfc/rfc3530.txt.
 100            And the Windows ace flag definitions here:
 101            librpc/idl/security.idl. */
 102         if (win_ace_flags & SEC_ACE_FLAG_INHERITED_ACE) {
 103                 nfs4_ace_flags |= SMB_ACE4_INHERITED_ACE;
 104         }
 105
 106         return nfs4_ace_flags;
 107 }
 108
 109 static SMB_ACL4_INT_T *get_validated_aclint(SMB4ACL_T *theacl)
 110 {
 111         SMB_ACL4_INT_T *aclint = (SMB_ACL4_INT_T *)theacl;
 112         if (theacl==NULL)
 113         {
 114                 DEBUG(2, ("acl is NULL\n"));
 115                 errno = EINVAL;
 116                 return NULL;
 117         }
 118         if (aclint->magic!=SMB_ACL4_INT_MAGIC)
 119         {
 120                 DEBUG(2, ("aclint bad magic 0x%x\n", aclint->magic));
 121                 errno = EINVAL;
 122                 return NULL;
 123         }
 124         return aclint;
 125 }
 126
 127 static SMB_ACE4_INT_T *get_validated_aceint(SMB4ACE_T *ace)
 128 {
 129         SMB_ACE4_INT_T *aceint = (SMB_ACE4_INT_T *)ace;
 130         if (ace==NULL)
 131         {
 132                 DEBUG(2, ("ace is NULL\n"));
 133                 errno = EINVAL;
 134                 return NULL;
 135         }
 136         if (aceint->magic!=SMB_ACE4_INT_MAGIC)
 137         {
 138                 DEBUG(2, ("aceint bad magic 0x%x\n", aceint->magic));
 139                 errno = EINVAL;
 140                 return NULL;
 141         }
 142         return aceint;
 143 }
 144
 145 SMB4ACL_T *smb_create_smb4acl(void)
 146 {
 147         TALLOC_CTX *mem_ctx = talloc_tos();
 148         SMB_ACL4_INT_T  *theacl = (SMB_ACL4_INT_T *)TALLOC_ZERO_SIZE(
 149                 mem_ctx, sizeof(SMB_ACL4_INT_T));
 150         if (theacl==NULL)
 151         {
 152                 DEBUG(0, ("TALLOC_SIZE failed\n"));
 153                 errno = ENOMEM;
 154                 return NULL;
 155         }
 156         theacl->magic = SMB_ACL4_INT_MAGIC;
 157         /* theacl->first, last = NULL not needed */
 158         return (SMB4ACL_T *)theacl;
 159 }
 160
 161 SMB4ACE_T *smb_add_ace4(SMB4ACL_T *theacl, SMB_ACE4PROP_T *prop)
 162 {
 163         SMB_ACL4_INT_T *aclint = get_validated_aclint(theacl);
 164         TALLOC_CTX *mem_ctx = talloc_tos();
 165         SMB_ACE4_INT_T *ace;
 166
 167         ace = (SMB_ACE4_INT_T *)TALLOC_ZERO_SIZE(
 168                 mem_ctx, sizeof(SMB_ACE4_INT_T));
 169         if (ace==NULL)
 170         {
 171                 DEBUG(0, ("TALLOC_SIZE failed\n"));
 172                 errno = ENOMEM;
 173                 return NULL;
 174         }
 175         ace->magic = SMB_ACE4_INT_MAGIC;
 176         /* ace->next = NULL not needed */
 177         memcpy(&ace->prop, prop, sizeof(SMB_ACE4PROP_T));
 178
 179         if (aclint->first==NULL)
 180         {
 181                 aclint->first = ace;
 182                 aclint->last = ace;
 183         } else {
 184                 aclint->last->next = (void *)ace;
 185                 aclint->last = ace;
 186         }
 187         aclint->naces++;
 188
 189         return (SMB4ACE_T *)ace;
 190 }
 191
 192 SMB_ACE4PROP_T *smb_get_ace4(SMB4ACE_T *ace)
 193 {
 194         SMB_ACE4_INT_T *aceint = get_validated_aceint(ace);
 195         if (aceint==NULL)
 196                 return NULL;
 197
 198         return &aceint->prop;
 199 }
 200
 201 SMB4ACE_T *smb_next_ace4(SMB4ACE_T *ace)
 202 {
 203         SMB_ACE4_INT_T *aceint = get_validated_aceint(ace);
 204         if (aceint==NULL)
 205                 return NULL;
 206
 207         return (SMB4ACE_T *)aceint->next;
 208 }
 209
 210 SMB4ACE_T *smb_first_ace4(SMB4ACL_T *theacl)
 211 {
 212         SMB_ACL4_INT_T *aclint = get_validated_aclint(theacl);
 213         if (aclint==NULL)
 214                 return NULL;
 215
 216         return (SMB4ACE_T *)aclint->first;
 217 }
 218
 219 uint32 smb_get_naces(SMB4ACL_T *theacl)
 220 {
 221         SMB_ACL4_INT_T *aclint = get_validated_aclint(theacl);
 222         if (aclint==NULL)
 223                 return 0;
 224
 225         return aclint->naces;
 226 }
 227
 228 static int smbacl4_GetFileOwner(struct connection_struct *conn,
 229                                 const char *filename,
 230                                 SMB_STRUCT_STAT *psbuf)
 231 {
 232         memset(psbuf, 0, sizeof(SMB_STRUCT_STAT));
 233
 234         /* Get the stat struct for the owner info. */
 235         if (vfs_stat_smb_fname(conn, filename, psbuf) != 0)
 236         {
 237                 DEBUG(8, ("vfs_stat_smb_fname failed with error %s\n",
 238                         strerror(errno)));
 239                 return -1;
 240         }
 241
 242         return 0;
 243 }
 244
 245 static int smbacl4_fGetFileOwner(files_struct *fsp, SMB_STRUCT_STAT *psbuf)
 246 {
 247         memset(psbuf, 0, sizeof(SMB_STRUCT_STAT));
 248
 249         if (fsp->fh->fd == -1) {
 250                 return smbacl4_GetFileOwner(fsp->conn,
 251                                             fsp->fsp_name->base_name, psbuf);
 252         }
 253         if (SMB_VFS_FSTAT(fsp, psbuf) != 0)
 254         {
 255                 DEBUG(8, ("SMB_VFS_FSTAT failed with error %s\n",
 256                         strerror(errno)));
 257                 return -1;
 258         }
 259
 260         return 0;
 261 }
 262
 263 static bool smbacl4_nfs42win(TALLOC_CTX *mem_ctx, SMB4ACL_T *theacl, /* in */
 264         struct dom_sid *psid_owner, /* in */
 265         struct dom_sid *psid_group, /* in */
 266         bool is_directory, /* in */
 267         struct security_ace **ppnt_ace_list, /* out */
 268         int *pgood_aces /* out */
 269 )
 270 {
 271         SMB_ACL4_INT_T *aclint = (SMB_ACL4_INT_T *)theacl;
 272         SMB_ACE4_INT_T *aceint;
 273         struct security_ace *nt_ace_list = NULL;
 274         int good_aces = 0;
 275
 276         DEBUG(10, ("smbacl_nfs42win entered\n"));
 277
 278         aclint = get_validated_aclint(theacl);
 279         /* We do not check for naces being 0 or theacl being NULL here
 280          * because it is done upstream */
 281         /* in smb_get_nt_acl_nfs4(). */
 282         nt_ace_list = (struct security_ace *)TALLOC_ZERO_SIZE(
 283                 mem_ctx, aclint->naces * sizeof(struct security_ace));
 284         if (nt_ace_list==NULL)
 285         {
 286                 DEBUG(10, ("talloc error"));
 287                 errno = ENOMEM;
 288                 return False;
 289         }
 290
 291         for (aceint=aclint->first;
 292              aceint!=NULL;
 293              aceint=(SMB_ACE4_INT_T *)aceint->next) {
 294                 uint32_t mask;
 295                 struct dom_sid sid;
 296                 SMB_ACE4PROP_T  *ace = &aceint->prop;
 297                 uint32_t win_ace_flags;
 298
 299                 DEBUG(10, ("magic: 0x%x, type: %d, iflags: %x, flags: %x, "
 300                            "mask: %x, who: %d\n",
 301                            aceint->magic, ace->aceType, ace->flags,
 302                            ace->aceFlags, ace->aceMask, ace->who.id));
 303
 304                 SMB_ASSERT(aceint->magic==SMB_ACE4_INT_MAGIC);
 305
 306                 if (ace->flags & SMB_ACE4_ID_SPECIAL) {
 307                         switch (ace->who.special_id) {
 308                         case SMB_ACE4_WHO_OWNER:
 309                                 sid_copy(&sid, psid_owner);
 310                                 break;
 311                         case SMB_ACE4_WHO_GROUP:
 312                                 sid_copy(&sid, psid_group);
 313                                 break;
 314                         case SMB_ACE4_WHO_EVERYONE:
 315                                 sid_copy(&sid, &global_sid_World);
 316                                 break;
 317                         default:
 318                                 DEBUG(8, ("invalid special who id %d "
 319                                         "ignored\n", ace->who.special_id));
 320                                 continue;
 321                         }
 322                 } else {
 323                         if (ace->aceFlags & SMB_ACE4_IDENTIFIER_GROUP) {
 324                                 gid_to_sid(&sid, ace->who.gid);
 325                         } else {
 326                                 uid_to_sid(&sid, ace->who.uid);
 327                         }
 328                 }
 329                 DEBUG(10, ("mapped %d to %s\n", ace->who.id,
 330                            sid_string_dbg(&sid)));
 331
 332                 if (is_directory && (ace->aceMask & SMB_ACE4_ADD_FILE)) {
 333                         ace->aceMask |= SMB_ACE4_DELETE_CHILD;
 334                 }
 335
 336                 win_ace_flags = map_nfs4_ace_flags_to_windows_ace_flags(
 337                         ace->aceFlags);
 338                 if (!is_directory &&
 339                     (win_ace_flags & (SEC_ACE_FLAG_OBJECT_INHERIT|
 340                                       SEC_ACE_FLAG_CONTAINER_INHERIT))) {
 341                         /*
 342                          * GPFS sets inherits dir_inhert and file_inherit flags
 343                          * to files, too, which confuses windows, and seems to
 344                          * be wrong anyways. ==> Map these bits away for files.
 345                          */
 346                         DEBUG(10, ("removing inherit flags from nfs4 ace\n"));
 347                         win_ace_flags &= ~(SEC_ACE_FLAG_OBJECT_INHERIT|
 348                                            SEC_ACE_FLAG_CONTAINER_INHERIT);
 349                 }
 350                 DEBUG(10, ("Windows mapped ace flags: 0x%x => 0x%x\n",
 351                       ace->aceFlags, win_ace_flags));
 352
 353                 mask = ace->aceMask;
 354                 /* Windows clients expect SYNC on acls to
 355                    correctly allow rename. See bug #7909. */
 356                 /* But not on DENY ace entries. See
 357                    bug #8442. */
 358                 if(ace->aceType == SMB_ACE4_ACCESS_ALLOWED_ACE_TYPE) {
 359                         mask = ace->aceMask | SMB_ACE4_SYNCHRONIZE;
 360                 }
 361                 init_sec_ace(&nt_ace_list[good_aces++], &sid,
 362                         ace->aceType, mask,
 363                         win_ace_flags);
 364         }
 365
 366         *ppnt_ace_list = nt_ace_list;
 367         *pgood_aces = good_aces;
 368
 369         return True;
 370 }
 371
 372 static NTSTATUS smb_get_nt_acl_nfs4_common(const SMB_STRUCT_STAT *sbuf,
 373         uint32 security_info,
 374         struct security_descriptor **ppdesc, SMB4ACL_T *theacl)
 375 {
 376         int     good_aces = 0;
 377         struct dom_sid sid_owner, sid_group;
 378         size_t sd_size = 0;
 379         struct security_ace *nt_ace_list = NULL;
 380         struct security_acl *psa = NULL;
 381         TALLOC_CTX *mem_ctx = talloc_tos();
 382
 383         if (theacl==NULL || smb_get_naces(theacl)==0)
 384                 return NT_STATUS_ACCESS_DENIED; /* special because we
 385                                                  * shouldn't alloc 0 for
 386                                                  * win */
 387
 388         uid_to_sid(&sid_owner, sbuf->st_ex_uid);
 389         gid_to_sid(&sid_group, sbuf->st_ex_gid);
 390
 391         if (smbacl4_nfs42win(mem_ctx, theacl, &sid_owner, &sid_group,
 392                              S_ISDIR(sbuf->st_ex_mode),
 393                                 &nt_ace_list, &good_aces)==False) {
 394                 DEBUG(8,("smbacl4_nfs42win failed\n"));
 395                 return map_nt_error_from_unix(errno);
 396         }
 397
 398         psa = make_sec_acl(mem_ctx, NT4_ACL_REVISION, good_aces, nt_ace_list);
 399         if (psa == NULL) {
 400                 DEBUG(2,("make_sec_acl failed\n"));
 401                 return NT_STATUS_NO_MEMORY;
 402         }
 403
 404         DEBUG(10,("after make sec_acl\n"));
 405         *ppdesc = make_sec_desc(
 406                 mem_ctx, SD_REVISION, SEC_DESC_SELF_RELATIVE,
 407                 (security_info & SECINFO_OWNER) ? &sid_owner : NULL,
 408                 (security_info & SECINFO_GROUP) ? &sid_group : NULL,
 409                 NULL, psa, &sd_size);
 410         if (*ppdesc==NULL) {
 411                 DEBUG(2,("make_sec_desc failed\n"));
 412                 return NT_STATUS_NO_MEMORY;
 413         }
 414
 415         DEBUG(10, ("smb_get_nt_acl_nfs4_common successfully exited with "
 416                    "sd_size %d\n",
 417                    (int)ndr_size_security_descriptor(*ppdesc, 0)));
 418
 419         return NT_STATUS_OK;
 420 }
 421
 422 NTSTATUS smb_fget_nt_acl_nfs4(files_struct *fsp,
 423                               uint32 security_info,
 424                               struct security_descriptor **ppdesc,
 425                               SMB4ACL_T *theacl)
 426 {
 427         SMB_STRUCT_STAT sbuf;
 428
 429         DEBUG(10, ("smb_fget_nt_acl_nfs4 invoked for %s\n", fsp_str_dbg(fsp)));
 430
 431         if (smbacl4_fGetFileOwner(fsp, &sbuf)) {
 432                 return map_nt_error_from_unix(errno);
 433         }
 434
 435         return smb_get_nt_acl_nfs4_common(&sbuf, security_info, ppdesc,
 436                                           theacl);
 437 }
 438
 439 NTSTATUS smb_get_nt_acl_nfs4(struct connection_struct *conn,
 440                              const char *name,
 441                              uint32 security_info,
 442                              struct security_descriptor **ppdesc,
 443                              SMB4ACL_T *theacl)
 444 {
 445         SMB_STRUCT_STAT sbuf;
 446
 447         DEBUG(10, ("smb_get_nt_acl_nfs4 invoked for %s\n", name));
 448
 449         if (smbacl4_GetFileOwner(conn, name, &sbuf)) {
 450                 return map_nt_error_from_unix(errno);
 451         }
 452
 453         return smb_get_nt_acl_nfs4_common(&sbuf, security_info, ppdesc,
 454                                           theacl);
 455 }
 456
 457 enum smbacl4_mode_enum {e_simple=0, e_special=1};
 458 enum smbacl4_acedup_enum {e_dontcare=0, e_reject=1, e_ignore=2, e_merge=3};
 459
 460 typedef struct _smbacl4_vfs_params {
 461         enum smbacl4_mode_enum mode;
 462         bool do_chown;
 463         enum smbacl4_acedup_enum acedup;
 464 } smbacl4_vfs_params;
 465
 466 /*
 467  * Gather special parameters for NFS4 ACL handling
 468  */
 469 static int smbacl4_get_vfs_params(
 470         const char *type_name,
 471         files_struct *fsp,
 472         smbacl4_vfs_params *params
 473 )
 474 {
 475         static const struct enum_list enum_smbacl4_modes[] = {
 476                 { e_simple, "simple" },
 477                 { e_special, "special" },
 478                 { -1 , NULL }
 479         };
 480         static const struct enum_list enum_smbacl4_acedups[] = {
 481                 { e_dontcare, "dontcare" },
 482                 { e_reject, "reject" },
 483                 { e_ignore, "ignore" },
 484                 { e_merge, "merge" },
 485                 { -1 , NULL }
 486         };
 487
 488         memset(params, 0, sizeof(smbacl4_vfs_params));
 489         params->mode = (enum smbacl4_mode_enum)lp_parm_enum(
 490                 SNUM(fsp->conn), type_name,
 491                 "mode", enum_smbacl4_modes, e_simple);
 492         params->do_chown = lp_parm_bool(SNUM(fsp->conn), type_name,
 493                 "chown", True);
 494         params->acedup = (enum smbacl4_acedup_enum)lp_parm_enum(
 495                 SNUM(fsp->conn), type_name,
 496                 "acedup", enum_smbacl4_acedups, e_dontcare);
 497
 498         DEBUG(10, ("mode:%s, do_chown:%s, acedup: %s\n",
 499                 enum_smbacl4_modes[params->mode].name,
 500                 params->do_chown ? "true" : "false",
 501                 enum_smbacl4_acedups[params->acedup].name));
 502
 503         return 0;
 504 }
 505
 506 static void smbacl4_dump_nfs4acl(int level, SMB4ACL_T *theacl)
 507 {
 508         SMB_ACL4_INT_T *aclint = get_validated_aclint(theacl);
 509         SMB_ACE4_INT_T *aceint;
 510
 511         DEBUG(level, ("NFS4ACL: size=%d\n", aclint->naces));
 512
 513         for (aceint = aclint->first;
 514              aceint!=NULL;
 515              aceint=(SMB_ACE4_INT_T *)aceint->next) {
 516                 SMB_ACE4PROP_T *ace = &aceint->prop;
 517
 518                 DEBUG(level, ("\tACE: type=%d, flags=0x%x, fflags=0x%x, "
 519                               "mask=0x%x, id=%d\n",
 520                               ace->aceType,
 521                               ace->aceFlags, ace->flags,
 522                               ace->aceMask,
 523                               ace->who.id));
 524         }
 525 }
 526
 527 /*
 528  * Find 2 NFS4 who-special ACE property (non-copy!!!)
 529  * match nonzero if "special" and who is equal
 530  * return ace if found matching; otherwise NULL
 531  */
 532 static SMB_ACE4PROP_T *smbacl4_find_equal_special(
 533         SMB4ACL_T *theacl,
 534         SMB_ACE4PROP_T *aceNew)
 535 {
 536         SMB_ACL4_INT_T *aclint = get_validated_aclint(theacl);
 537         SMB_ACE4_INT_T *aceint;
 538
 539         for (aceint = aclint->first; aceint != NULL;
 540              aceint=(SMB_ACE4_INT_T *)aceint->next) {
 541                 SMB_ACE4PROP_T *ace = &aceint->prop;
 542
 543                 DEBUG(10,("ace type:0x%x flags:0x%x aceFlags:0x%x "
 544                           "new type:0x%x flags:0x%x aceFlags:0x%x\n",
 545                           ace->aceType, ace->flags, ace->aceFlags,
 546                           aceNew->aceType, aceNew->flags,aceNew->aceFlags));
 547
 548                 if (ace->flags == aceNew->flags &&
 549                         ace->aceType==aceNew->aceType &&
 550                         ace->aceFlags==aceNew->aceFlags)
 551                 {
 552                         /* keep type safety; e.g. gid is an u.short */
 553                         if (ace->flags & SMB_ACE4_ID_SPECIAL)
 554                         {
 555                                 if (ace->who.special_id ==
 556                                     aceNew->who.special_id)
 557                                         return ace;
 558                         } else {
 559                                 if (ace->aceFlags & SMB_ACE4_IDENTIFIER_GROUP)
 560                                 {
 561                                         if (ace->who.gid==aceNew->who.gid)
 562                                                 return ace;
 563                                 } else {
 564                                         if (ace->who.uid==aceNew->who.uid)
 565                                                 return ace;
 566                                 }
 567                         }
 568                 }
 569         }
 570
 571         return NULL;
 572 }
 573
 574
 575 static bool smbacl4_fill_ace4(
 576         TALLOC_CTX *mem_ctx,
 577         const struct smb_filename *filename,
 578         smbacl4_vfs_params *params,
 579         uid_t ownerUID,
 580         gid_t ownerGID,
 581         const struct security_ace *ace_nt, /* input */
 582         SMB_ACE4PROP_T *ace_v4 /* output */
 583 )
 584 {
 585         DEBUG(10, ("got ace for %s\n", sid_string_dbg(&ace_nt->trustee)));
 586
 587         memset(ace_v4, 0, sizeof(SMB_ACE4PROP_T));
 588
 589         /* only ACCESS|DENY supported right now */
 590         ace_v4->aceType = ace_nt->type;
 591
 592         ace_v4->aceFlags = map_windows_ace_flags_to_nfs4_ace_flags(
 593                 ace_nt->flags);
 594
 595         /* remove inheritance flags on files */
 596         if (VALID_STAT(filename->st) &&
 597             !S_ISDIR(filename->st.st_ex_mode)) {
 598                 DEBUG(10, ("Removing inheritance flags from a file\n"));
 599                 ace_v4->aceFlags &= ~(SMB_ACE4_FILE_INHERIT_ACE|
 600                                       SMB_ACE4_DIRECTORY_INHERIT_ACE|
 601                                       SMB_ACE4_NO_PROPAGATE_INHERIT_ACE|
 602                                       SMB_ACE4_INHERIT_ONLY_ACE);
 603         }
 604
 605         ace_v4->aceMask = ace_nt->access_mask &
 606                 (SEC_STD_ALL | SEC_FILE_ALL);
 607
 608         se_map_generic(&ace_v4->aceMask, &file_generic_mapping);
 609
 610         if (ace_v4->aceFlags!=ace_nt->flags)
 611                 DEBUG(9, ("ace_v4->aceFlags(0x%x)!=ace_nt->flags(0x%x)\n",
 612                         ace_v4->aceFlags, ace_nt->flags));
 613
 614         if (ace_v4->aceMask!=ace_nt->access_mask)
 615                 DEBUG(9, ("ace_v4->aceMask(0x%x)!=ace_nt->access_mask(0x%x)\n",
 616                         ace_v4->aceMask, ace_nt->access_mask));
 617
 618         if (dom_sid_equal(&ace_nt->trustee, &global_sid_World)) {
 619                 ace_v4->who.special_id = SMB_ACE4_WHO_EVERYONE;
 620                 ace_v4->flags |= SMB_ACE4_ID_SPECIAL;
 621         } else {
 622                 uid_t uid;
 623                 gid_t gid;
 624
 625                 if (sid_to_gid(&ace_nt->trustee, &gid)) {
 626                         ace_v4->aceFlags |= SMB_ACE4_IDENTIFIER_GROUP;
 627
 628                         if (params->mode==e_special && gid==ownerGID) {
 629                                 ace_v4->flags |= SMB_ACE4_ID_SPECIAL;
 630                                 ace_v4->who.special_id = SMB_ACE4_WHO_GROUP;
 631                         } else {
 632                                 ace_v4->who.gid = gid;
 633                         }
 634                 } else if (sid_to_uid(&ace_nt->trustee, &uid)) {
 635                         if (params->mode==e_special && uid==ownerUID) {
 636                                 ace_v4->flags |= SMB_ACE4_ID_SPECIAL;
 637                                 ace_v4->who.special_id = SMB_ACE4_WHO_OWNER;
 638                         } else {
 639                                 ace_v4->who.uid = uid;
 640                         }
 641                 } else {
 642                         DEBUG(1, ("nfs4_acls.c: file [%s]: could not "
 643                                   "convert %s to uid or gid\n",
 644                                   filename->base_name,
 645                                   sid_string_dbg(&ace_nt->trustee)));
 646                         return False;
 647                 }
 648         }
 649
 650         return True; /* OK */
 651 }
 652
 653 static int smbacl4_MergeIgnoreReject(
 654         enum smbacl4_acedup_enum acedup,
 655         SMB4ACL_T *theacl, /* may modify it */
 656         SMB_ACE4PROP_T *ace, /* the "new" ACE */
 657         bool    *paddNewACE,
 658         int     i
 659 )
 660 {
 661         int     result = 0;
 662         SMB_ACE4PROP_T *ace4found = smbacl4_find_equal_special(theacl, ace);
 663         if (ace4found)
 664         {
 665                 switch(acedup)
 666                 {
 667                 case e_merge: /* "merge" flags */
 668                         *paddNewACE = False;
 669                         ace4found->aceFlags |= ace->aceFlags;
 670                         ace4found->aceMask |= ace->aceMask;
 671                         break;
 672                 case e_ignore: /* leave out this record */
 673                         *paddNewACE = False;
 674                         break;
 675                 case e_reject: /* do an error */
 676                         DEBUG(8, ("ACL rejected by duplicate nt ace#%d\n", i));
 677                         errno = EINVAL; /* SHOULD be set on any _real_ error */
 678                         result = -1;
 679                         break;
 680                 default:
 681                         break;
 682                 }
 683         }
 684         return result;
 685 }
 686
 687 static SMB4ACL_T *smbacl4_win2nfs4(
 688         const files_struct *fsp,
 689         const struct security_acl *dacl,
 690         smbacl4_vfs_params *pparams,
 691         uid_t ownerUID,
 692         gid_t ownerGID
 693 )
 694 {
 695         SMB4ACL_T *theacl;
 696         uint32  i;
 697         TALLOC_CTX *mem_ctx = talloc_tos();
 698         const char *filename = fsp->fsp_name->base_name;
 699
 700         DEBUG(10, ("smbacl4_win2nfs4 invoked\n"));
 701
 702         theacl = smb_create_smb4acl();
 703         if (theacl==NULL)
 704                 return NULL;
 705
 706         for(i=0; i<dacl->num_aces; i++) {
 707                 SMB_ACE4PROP_T  ace_v4;
 708                 bool    addNewACE = True;
 709
 710                 if (!smbacl4_fill_ace4(mem_ctx, fsp->fsp_name, pparams,
 711                                        ownerUID, ownerGID,
 712                                        dacl->aces + i, &ace_v4)) {
 713                         DEBUG(3, ("Could not fill ace for file %s, SID %s\n",
 714                                   filename,
 715                                   sid_string_dbg(&((dacl->aces+i)->trustee))));
 716                         continue;
 717                 }
 718
 719                 if (pparams->acedup!=e_dontcare) {
 720                         if (smbacl4_MergeIgnoreReject(pparams->acedup, theacl,
 721                                 &ace_v4, &addNewACE, i))
 722                                 return NULL;
 723                 }
 724
 725                 if (addNewACE)
 726                         smb_add_ace4(theacl, &ace_v4);
 727         }
 728
 729         return theacl;
 730 }
 731
 732 NTSTATUS smb_set_nt_acl_nfs4(files_struct *fsp,
 733         uint32 security_info_sent,
 734         const struct security_descriptor *psd,
 735         set_nfs4acl_native_fn_t set_nfs4_native)
 736 {
 737         smbacl4_vfs_params params;
 738         SMB4ACL_T *theacl = NULL;
 739         bool    result;
 740
 741         SMB_STRUCT_STAT sbuf;
 742         bool set_acl_as_root = false;
 743         uid_t newUID = (uid_t)-1;
 744         gid_t newGID = (gid_t)-1;
 745         int saved_errno;
 746
 747         DEBUG(10, ("smb_set_nt_acl_nfs4 invoked for %s\n", fsp_str_dbg(fsp)));
 748
 749         if ((security_info_sent & (SECINFO_DACL |
 750                 SECINFO_GROUP | SECINFO_OWNER)) == 0)
 751         {
 752                 DEBUG(9, ("security_info_sent (0x%x) ignored\n",
 753                         security_info_sent));
 754                 return NT_STATUS_OK; /* won't show error - later to be
 755                                       * refined... */
 756         }
 757
 758         /* Special behaviours */
 759         if (smbacl4_get_vfs_params(SMBACL4_PARAM_TYPE_NAME, fsp, &params))
 760                 return NT_STATUS_NO_MEMORY;
 761
 762         if (smbacl4_fGetFileOwner(fsp, &sbuf))
 763                 return map_nt_error_from_unix(errno);
 764
 765         if (params.do_chown) {
 766                 /* chown logic is a copy/paste from posix_acl.c:set_nt_acl */
 767                 NTSTATUS status = unpack_nt_owners(fsp->conn, &newUID, &newGID,
 768                                                    security_info_sent, psd);
 769                 if (!NT_STATUS_IS_OK(status)) {
 770                         DEBUG(8, ("unpack_nt_owners failed"));
 771                         return status;
 772                 }
 773                 if (((newUID != (uid_t)-1) && (sbuf.st_ex_uid != newUID)) ||
 774                     ((newGID != (gid_t)-1) && (sbuf.st_ex_gid != newGID))) {
 775
 776                         status = try_chown(fsp, newUID, newGID);
 777                         if (!NT_STATUS_IS_OK(status)) {
 778                                 DEBUG(3,("chown %s, %u, %u failed. Error = "
 779                                          "%s.\n", fsp_str_dbg(fsp),
 780                                          (unsigned int)newUID,
 781                                          (unsigned int)newGID,
 782                                          nt_errstr(status)));
 783                                 return status;
 784                         }
 785
 786                         DEBUG(10,("chown %s, %u, %u succeeded.\n",
 787                                   fsp_str_dbg(fsp), (unsigned int)newUID,
 788                                   (unsigned int)newGID));
 789                         if (smbacl4_GetFileOwner(fsp->conn,
 790                                                  fsp->fsp_name->base_name,
 791                                                  &sbuf))
 792                                 return map_nt_error_from_unix(errno);
 793
 794                         /* If we successfully chowned, we know we must
 795                          * be able to set the acl, so do it as root.
 796                          */
 797                         set_acl_as_root = true;
 798                 }
 799         }
 800
 801         if (!(security_info_sent & SECINFO_DACL) || psd->dacl ==NULL) {
 802                 DEBUG(10, ("no dacl found; security_info_sent = 0x%x\n",
 803                            security_info_sent));
 804                 return NT_STATUS_OK;
 805         }
 806
 807         theacl = smbacl4_win2nfs4(fsp, psd->dacl, &params,
 808                                   sbuf.st_ex_uid, sbuf.st_ex_gid);
 809         if (!theacl)
 810                 return map_nt_error_from_unix(errno);
 811
 812         smbacl4_dump_nfs4acl(10, theacl);
 813
 814         if (set_acl_as_root) {
 815                 become_root();
 816         }
 817         result = set_nfs4_native(fsp, theacl);
 818         saved_errno = errno;
 819         if (set_acl_as_root) {
 820                 unbecome_root();
 821         }
 822         if (result!=True) {
 823                 errno = saved_errno;
 824                 DEBUG(10, ("set_nfs4_native failed with %s\n",
 825                            strerror(errno)));
 826                 return map_nt_error_from_unix(errno);
 827         }
 828
 829         DEBUG(10, ("smb_set_nt_acl_nfs4 succeeded\n"));
 830         return NT_STATUS_OK;
 831 }