source3/smbd/filename.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    filename handling routines
   4    Copyright (C) Andrew Tridgell 1992-1998
   5    Copyright (C) Jeremy Allison 1999-2007
   6    Copyright (C) Ying Chen 2000
   7    Copyright (C) Volker Lendecke 2007
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21 */
  22
  23 /*
  24  * New hash table stat cache code added by Ying Chen.
  25  */
  26
  27 #include "includes.h"
  28 #include "system/filesys.h"
  29 #include "fake_file.h"
  30 #include "smbd/smbd.h"
  31 #include "smbd/globals.h"
  32 #include "lib/util/memcache.h"
  33 #include "libcli/smb/reparse.h"
  34
  35 uint32_t ucf_flags_from_smb_request(struct smb_request *req)
  36 {
  37         uint32_t ucf_flags = 0;
  38
  39         if (req == NULL) {
  40                 return 0;
  41         }
  42
  43         if (req->posix_pathnames) {
  44                 ucf_flags |= UCF_POSIX_PATHNAMES;
  45
  46                 if (!req->sconn->using_smb2) {
  47                         ucf_flags |= UCF_LCOMP_LNK_OK;
  48                 }
  49         }
  50         if (req->flags2 & FLAGS2_DFS_PATHNAMES) {
  51                 ucf_flags |= UCF_DFS_PATHNAME;
  52         }
  53         if (req->flags2 & FLAGS2_REPARSE_PATH) {
  54                 ucf_flags |= UCF_GMT_PATHNAME;
  55         }
  56
  57         return ucf_flags;
  58 }
  59
  60 uint32_t filename_create_ucf_flags(struct smb_request *req, uint32_t create_disposition)
  61 {
  62         uint32_t ucf_flags = 0;
  63
  64         ucf_flags |= ucf_flags_from_smb_request(req);
  65
  66         switch (create_disposition) {
  67         case FILE_OPEN:
  68         case FILE_OVERWRITE:
  69                 break;
  70         case FILE_SUPERSEDE:
  71         case FILE_CREATE:
  72         case FILE_OPEN_IF:
  73         case FILE_OVERWRITE_IF:
  74                 ucf_flags |= UCF_PREP_CREATEFILE;
  75                 break;
  76         }
  77
  78         return ucf_flags;
  79 }
  80
  81 /****************************************************************************
  82  Mangle the 2nd name and check if it is then equal to the first name.
  83 ****************************************************************************/
  84
  85 static bool mangled_equal(const char *name1,
  86                         const char *name2,
  87                         const struct share_params *p)
  88 {
  89         char mname[13];
  90
  91         if (!name_to_8_3(name2, mname, False, p)) {
  92                 return False;
  93         }
  94         return strequal(name1, mname);
  95 }
  96
  97 /*
  98  * Strip a valid @GMT-token from any incoming filename path,
  99  * adding any NTTIME encoded in the pathname into the
 100  * twrp field of the passed in smb_fname.
 101  *
 102  * Valid @GMT-tokens look like @GMT-YYYY-MM-DD-HH-MM-SS
 103  * at the *start* of a pathname component.
 104  *
 105  * If twrp is passed in then smb_fname->twrp is set to that
 106  * value, and the @GMT-token part of the filename is removed
 107  * and does not change the stored smb_fname->twrp.
 108  *
 109  */
 110
 111 NTSTATUS canonicalize_snapshot_path(struct smb_filename *smb_fname,
 112                                     uint32_t ucf_flags,
 113                                     NTTIME twrp)
 114 {
 115         bool found;
 116
 117         if (twrp != 0) {
 118                 smb_fname->twrp = twrp;
 119         }
 120
 121         if (!(ucf_flags & UCF_GMT_PATHNAME)) {
 122                 return NT_STATUS_OK;
 123         }
 124
 125         found = extract_snapshot_token(smb_fname->base_name, &twrp);
 126         if (!found) {
 127                 return NT_STATUS_OK;
 128         }
 129
 130         if (smb_fname->twrp == 0) {
 131                 smb_fname->twrp = twrp;
 132         }
 133
 134         return NT_STATUS_OK;
 135 }
 136
 137 static bool strnorm(char *s, int case_default)
 138 {
 139         if (case_default == CASE_UPPER)
 140                 return strupper_m(s);
 141         else
 142                 return strlower_m(s);
 143 }
 144
 145 /*
 146  * Utility function to normalize case on an incoming client filename
 147  * if required on this connection struct.
 148  * Performs an in-place case conversion guaranteed to stay the same size.
 149  */
 150
 151 static NTSTATUS normalize_filename_case(connection_struct *conn,
 152                                         char *filename,
 153                                         uint32_t ucf_flags)
 154 {
 155         bool ok;
 156
 157         if (ucf_flags & UCF_POSIX_PATHNAMES) {
 158                 /*
 159                  * POSIX never normalizes filename case.
 160                  */
 161                 return NT_STATUS_OK;
 162         }
 163         if (!conn->case_sensitive) {
 164                 return NT_STATUS_OK;
 165         }
 166         if (conn->case_preserve) {
 167                 return NT_STATUS_OK;
 168         }
 169         if (conn->short_case_preserve) {
 170                 return NT_STATUS_OK;
 171         }
 172         ok = strnorm(filename, lp_default_case(SNUM(conn)));
 173         if (!ok) {
 174                 return NT_STATUS_INVALID_PARAMETER;
 175         }
 176         return NT_STATUS_OK;
 177 }
 178
 179 /****************************************************************************
 180  Check if two filenames are equal.
 181  This needs to be careful about whether we are case sensitive.
 182 ****************************************************************************/
 183
 184 static bool fname_equal(const char *name1, const char *name2,
 185                 bool case_sensitive)
 186 {
 187         /* Normal filename handling */
 188         if (case_sensitive) {
 189                 return(strcmp(name1,name2) == 0);
 190         }
 191
 192         return(strequal(name1,name2));
 193 }
 194
 195 static bool sname_equal(const char *name1, const char *name2,
 196                 bool case_sensitive)
 197 {
 198         bool match;
 199         const char *s1 = NULL;
 200         const char *s2 = NULL;
 201         size_t n1;
 202         size_t n2;
 203         const char *e1 = NULL;
 204         const char *e2 = NULL;
 205         char *c1 = NULL;
 206         char *c2 = NULL;
 207
 208         match = fname_equal(name1, name2, case_sensitive);
 209         if (match) {
 210                 return true;
 211         }
 212
 213         if (name1[0] != ':') {
 214                 return false;
 215         }
 216         if (name2[0] != ':') {
 217                 return false;
 218         }
 219         s1 = &name1[1];
 220         e1 = strchr(s1, ':');
 221         if (e1 == NULL) {
 222                 n1 = strlen(s1);
 223         } else {
 224                 n1 = PTR_DIFF(e1, s1);
 225         }
 226         s2 = &name2[1];
 227         e2 = strchr(s2, ':');
 228         if (e2 == NULL) {
 229                 n2 = strlen(s2);
 230         } else {
 231                 n2 = PTR_DIFF(e2, s2);
 232         }
 233
 234         /* Normal filename handling */
 235         if (case_sensitive) {
 236                 return (strncmp(s1, s2, n1) == 0);
 237         }
 238
 239         /*
 240          * We can't use strnequal() here
 241          * as it takes the number of codepoints
 242          * and not the number of bytes.
 243          *
 244          * So we make a copy before calling
 245          * strequal().
 246          *
 247          * Note that we TALLOC_FREE() in reverse order
 248          * in order to avoid memory fragmentation.
 249          */
 250
 251         c1 = talloc_strndup(talloc_tos(), s1, n1);
 252         c2 = talloc_strndup(talloc_tos(), s2, n2);
 253         if (c1 == NULL || c2 == NULL) {
 254                 TALLOC_FREE(c2);
 255                 TALLOC_FREE(c1);
 256                 return (strncmp(s1, s2, n1) == 0);
 257         }
 258
 259         match = strequal(c1, c2);
 260         TALLOC_FREE(c2);
 261         TALLOC_FREE(c1);
 262         return match;
 263 }
 264
 265 /****************************************************************************
 266  Scan a directory to find a filename, matching without case sensitivity.
 267  If the name looks like a mangled name then try via the mangling functions
 268 ****************************************************************************/
 269
 270 NTSTATUS get_real_filename_full_scan_at(struct files_struct *dirfsp,
 271                                         const char *name,
 272                                         bool mangled,
 273                                         TALLOC_CTX *mem_ctx,
 274                                         char **found_name)
 275 {
 276         struct connection_struct *conn = dirfsp->conn;
 277         struct smb_Dir *cur_dir = NULL;
 278         const char *dname = NULL;
 279         char *talloced = NULL;
 280         char *unmangled_name = NULL;
 281         NTSTATUS status;
 282
 283         /* If we have a case-sensitive filesystem, it doesn't do us any
 284          * good to search for a name. If a case variation of the name was
 285          * there, then the original stat(2) would have found it.
 286          */
 287         if (!mangled && !(conn->fs_capabilities & FILE_CASE_SENSITIVE_SEARCH)) {
 288                 return NT_STATUS_OBJECT_NAME_NOT_FOUND;
 289         }
 290
 291         /*
 292          * The incoming name can be mangled, and if we de-mangle it
 293          * here it will not compare correctly against the filename (name2)
 294          * read from the directory and then mangled by the name_to_8_3()
 295          * call. We need to mangle both names or neither.
 296          * (JRA).
 297          *
 298          * Fix for bug found by Dina Fine. If in case sensitive mode then
 299          * the mangle cache is no good (3 letter extension could be wrong
 300          * case - so don't demangle in this case - leave as mangled and
 301          * allow the mangling of the directory entry read (which is done
 302          * case insensitively) to match instead. This will lead to more
 303          * false positive matches but we fail completely without it. JRA.
 304          */
 305
 306         if (mangled && !conn->case_sensitive) {
 307                 mangled = !mangle_lookup_name_from_8_3(talloc_tos(), name,
 308                                                        &unmangled_name,
 309                                                        conn->params);
 310                 if (!mangled) {
 311                         /* Name is now unmangled. */
 312                         name = unmangled_name;
 313                 }
 314         }
 315
 316         /* open the directory */
 317         status = OpenDir_from_pathref(talloc_tos(), dirfsp, NULL, 0, &cur_dir);
 318         if (!NT_STATUS_IS_OK(status)) {
 319                 DBG_NOTICE("scan dir didn't open dir [%s]: %s\n",
 320                            fsp_str_dbg(dirfsp),
 321                            nt_errstr(status));
 322                 TALLOC_FREE(unmangled_name);
 323                 return status;
 324         }
 325
 326         /* now scan for matching names */
 327         while ((dname = ReadDirName(cur_dir, &talloced))) {
 328
 329                 /* Is it dot or dot dot. */
 330                 if (ISDOT(dname) || ISDOTDOT(dname)) {
 331                         TALLOC_FREE(talloced);
 332                         continue;
 333                 }
 334
 335                 /*
 336                  * At this point dname is the unmangled name.
 337                  * name is either mangled or not, depending on the state
 338                  * of the "mangled" variable. JRA.
 339                  */
 340
 341                 /*
 342                  * Check mangled name against mangled name, or unmangled name
 343                  * against unmangled name.
 344                  */
 345
 346                 if ((mangled && mangled_equal(name,dname,conn->params)) ||
 347                         fname_equal(name, dname, conn->case_sensitive)) {
 348                         /* we've found the file, change it's name and return */
 349                         *found_name = talloc_strdup(mem_ctx, dname);
 350                         TALLOC_FREE(unmangled_name);
 351                         TALLOC_FREE(cur_dir);
 352                         if (!*found_name) {
 353                                 TALLOC_FREE(talloced);
 354                                 return NT_STATUS_NO_MEMORY;
 355                         }
 356                         TALLOC_FREE(talloced);
 357                         return NT_STATUS_OK;
 358                 }
 359                 TALLOC_FREE(talloced);
 360         }
 361
 362         TALLOC_FREE(unmangled_name);
 363         TALLOC_FREE(cur_dir);
 364         return NT_STATUS_OBJECT_NAME_NOT_FOUND;
 365 }
 366
 367 /****************************************************************************
 368  Wrapper around the vfs get_real_filename and the full directory scan
 369  fallback.
 370 ****************************************************************************/
 371
 372 NTSTATUS get_real_filename_at(struct files_struct *dirfsp,
 373                               const char *name,
 374                               TALLOC_CTX *mem_ctx,
 375                               char **found_name)
 376 {
 377         struct connection_struct *conn = dirfsp->conn;
 378         NTSTATUS status;
 379         bool mangled;
 380
 381         mangled = mangle_is_mangled(name, conn->params);
 382
 383         if (mangled) {
 384                 status = get_real_filename_full_scan_at(
 385                         dirfsp, name, mangled, mem_ctx, found_name);
 386                 return status;
 387         }
 388
 389         /* Try the vfs first to take advantage of case-insensitive stat. */
 390         status = SMB_VFS_GET_REAL_FILENAME_AT(
 391                 dirfsp->conn, dirfsp, name, mem_ctx, found_name);
 392
 393         /*
 394          * If the case-insensitive stat was successful, or returned an error
 395          * other than EOPNOTSUPP then there is no need to fall back on the
 396          * full directory scan.
 397          */
 398         if (NT_STATUS_IS_OK(status) ||
 399             !NT_STATUS_EQUAL(status, NT_STATUS_NOT_SUPPORTED)) {
 400                 return status;
 401         }
 402
 403         status = get_real_filename_full_scan_at(
 404                 dirfsp, name, mangled, mem_ctx, found_name);
 405         return status;
 406 }
 407
 408 /*
 409  * Create the memcache-key for GETREALFILENAME_CACHE: This supplements
 410  * the stat cache for the last component to be looked up. Cache
 411  * contents is the correctly capitalized translation of the parameter
 412  * "name" as it exists on disk. This is indexed by inode of the dirfsp
 413  * and name, and contrary to stat_cahce_lookup() it does not
 414  * vfs_stat() the last component. This will be taken care of by an
 415  * attempt to do a openat_pathref_fsp().
 416  */
 417 bool get_real_filename_cache_key(TALLOC_CTX *mem_ctx,
 418                                  struct files_struct *dirfsp,
 419                                  const char *name,
 420                                  DATA_BLOB *_key)
 421 {
 422         struct file_id fid = vfs_file_id_from_sbuf(
 423                 dirfsp->conn, &dirfsp->fsp_name->st);
 424         char *upper = NULL;
 425         uint8_t *key = NULL;
 426         size_t namelen, keylen;
 427
 428         upper = talloc_strdup_upper(mem_ctx, name);
 429         if (upper == NULL) {
 430                 return false;
 431         }
 432         namelen = talloc_get_size(upper);
 433
 434         keylen = namelen + sizeof(fid);
 435         if (keylen < sizeof(fid)) {
 436                 TALLOC_FREE(upper);
 437                 return false;
 438         }
 439
 440         key = talloc_size(mem_ctx, keylen);
 441         if (key == NULL) {
 442                 TALLOC_FREE(upper);
 443                 return false;
 444         }
 445
 446         memcpy(key, &fid, sizeof(fid));
 447         memcpy(key + sizeof(fid), upper, namelen);
 448         TALLOC_FREE(upper);
 449
 450         *_key = (DATA_BLOB) { .data = key, .length = keylen, };
 451         return true;
 452 }
 453
 454 /*
 455  * Lightweight function to just get last component
 456  * for rename / enumerate directory calls.
 457  */
 458
 459 char *get_original_lcomp(TALLOC_CTX *ctx,
 460                         connection_struct *conn,
 461                         const char *filename_in,
 462                         uint32_t ucf_flags)
 463 {
 464         char *last_slash = NULL;
 465         char *orig_lcomp;
 466         NTSTATUS status;
 467
 468         last_slash = strrchr(filename_in, '/');
 469         if (last_slash != NULL) {
 470                 orig_lcomp = talloc_strdup(ctx, last_slash+1);
 471         } else {
 472                 orig_lcomp = talloc_strdup(ctx, filename_in);
 473         }
 474         if (orig_lcomp == NULL) {
 475                 return NULL;
 476         }
 477         status = normalize_filename_case(conn, orig_lcomp, ucf_flags);
 478         if (!NT_STATUS_IS_OK(status)) {
 479                 TALLOC_FREE(orig_lcomp);
 480                 return NULL;
 481         }
 482         return orig_lcomp;
 483 }
 484
 485 /*
 486  * Get the correct capitalized stream name hanging off
 487  * base_fsp. Equivalent of get_real_filename(), but for streams.
 488  */
 489 static NTSTATUS get_real_stream_name(
 490         TALLOC_CTX *mem_ctx,
 491         struct files_struct *base_fsp,
 492         const char *stream_name,
 493         char **_found)
 494 {
 495         unsigned int i, num_streams = 0;
 496         struct stream_struct *streams = NULL;
 497         NTSTATUS status;
 498
 499         status = vfs_fstreaminfo(
 500                 base_fsp, talloc_tos(), &num_streams, &streams);
 501         if (!NT_STATUS_IS_OK(status)) {
 502                 return status;
 503         }
 504
 505         for (i=0; i<num_streams; i++) {
 506                 bool equal = sname_equal(stream_name, streams[i].name, false);
 507
 508                 DBG_DEBUG("comparing [%s] and [%s]: %sequal\n",
 509                           stream_name,
 510                           streams[i].name,
 511                           equal ? "" : "not ");
 512
 513                 if (equal) {
 514                         *_found = talloc_move(mem_ctx, &streams[i].name);
 515                         TALLOC_FREE(streams);
 516                         return NT_STATUS_OK;
 517                 }
 518         }
 519
 520         TALLOC_FREE(streams);
 521         return NT_STATUS_OBJECT_NAME_NOT_FOUND;
 522 }
 523
 524 static bool filename_split_lcomp(
 525         TALLOC_CTX *mem_ctx,
 526         const char *name_in,
 527         bool posix,
 528         char **_dirname,
 529         const char **_fname_rel,
 530         const char **_streamname)
 531 {
 532         const char *lcomp = NULL;
 533         const char *fname_rel = NULL;
 534         const char *streamname = NULL;
 535         char *dirname = NULL;
 536
 537         if (name_in[0] == '\0') {
 538                 fname_rel = ".";
 539                 dirname = talloc_strdup(mem_ctx, "");
 540                 if (dirname == NULL) {
 541                         return false;
 542                 }
 543                 goto done;
 544         }
 545
 546         lcomp = strrchr_m(name_in, '/');
 547         if (lcomp != NULL) {
 548                 fname_rel = lcomp+1;
 549                 dirname = talloc_strndup(mem_ctx, name_in, lcomp - name_in);
 550                 if (dirname == NULL) {
 551                         return false;
 552                 }
 553                 goto find_stream;
 554         }
 555
 556         /*
 557          * No slash, dir is empty
 558          */
 559         dirname = talloc_strdup(mem_ctx, "");
 560         if (dirname == NULL) {
 561                 return false;
 562         }
 563
 564         if (!posix && (name_in[0] == ':')) {
 565                 /*
 566                  * Special case for stream on root directory
 567                  */
 568                 fname_rel = ".";
 569                 streamname = name_in;
 570                 goto done;
 571         }
 572
 573         fname_rel = name_in;
 574
 575 find_stream:
 576         if (!posix) {
 577                 streamname = strchr_m(fname_rel, ':');
 578
 579                 if (streamname != NULL) {
 580                         fname_rel = talloc_strndup(
 581                                 mem_ctx,
 582                                 fname_rel,
 583                                 streamname - fname_rel);
 584                         if (fname_rel == NULL) {
 585                                 TALLOC_FREE(dirname);
 586                                 return false;
 587                         }
 588                 }
 589         }
 590
 591 done:
 592         *_dirname = dirname;
 593         *_fname_rel = fname_rel;
 594         *_streamname = streamname;
 595         return true;
 596 }
 597
 598 /*
 599  * Create the correct capitalization of a file name to be created.
 600  */
 601 static NTSTATUS filename_convert_normalize_new(
 602         TALLOC_CTX *mem_ctx,
 603         struct connection_struct *conn,
 604         char *name_in,
 605         char **_normalized)
 606 {
 607         char *name = name_in;
 608
 609         *_normalized = NULL;
 610
 611         if (!conn->case_preserve ||
 612             (mangle_is_8_3(name, false,
 613                            conn->params) &&
 614              !conn->short_case_preserve)) {
 615
 616                 char *normalized = talloc_strdup(mem_ctx, name);
 617                 if (normalized == NULL) {
 618                         return NT_STATUS_NO_MEMORY;
 619                 }
 620
 621                 strnorm(normalized, lp_default_case(SNUM(conn)));
 622                 name = normalized;
 623         }
 624
 625         if (mangle_is_mangled(name, conn->params)) {
 626                 bool found;
 627                 char *unmangled = NULL;
 628
 629                 found = mangle_lookup_name_from_8_3(
 630                         mem_ctx, name, &unmangled, conn->params);
 631                 if (found) {
 632                         name = unmangled;
 633                 }
 634         }
 635
 636         if (name != name_in) {
 637                 *_normalized = name;
 638         }
 639
 640         return NT_STATUS_OK;
 641 }
 642
 643 /*
 644  * Open smb_fname_rel->fsp as a pathref fsp with a case insensitive
 645  * fallback using GETREALFILENAME_CACHE and get_real_filename_at() if
 646  * the first attempt based on the filename sent by the client gives
 647  * ENOENT.
 648  */
 649 static NTSTATUS openat_pathref_fsp_case_insensitive(
 650         struct files_struct *dirfsp,
 651         struct smb_filename *smb_fname_rel,
 652         uint32_t ucf_flags)
 653 {
 654         const bool posix = (ucf_flags & UCF_POSIX_PATHNAMES);
 655         DATA_BLOB cache_key = { .data = NULL, };
 656         char *found_name = NULL;
 657         NTSTATUS status;
 658         bool ok;
 659
 660         SET_STAT_INVALID(smb_fname_rel->st);
 661
 662         /* Check veto files - only looks at last component. */
 663         if (IS_VETO_PATH(dirfsp->conn, smb_fname_rel->base_name)) {
 664                 DBG_DEBUG("veto files rejecting last component %s\n",
 665                           smb_fname_str_dbg(smb_fname_rel));
 666                 return NT_STATUS_NETWORK_OPEN_RESTRICTION;
 667         }
 668
 669         status = openat_pathref_fsp(dirfsp, smb_fname_rel);
 670
 671         if (NT_STATUS_IS_OK(status)) {
 672                 return NT_STATUS_OK;
 673         }
 674
 675         if (VALID_STAT(smb_fname_rel->st)) {
 676                 /*
 677                  * We got an error although the object existed. Might
 678                  * be a symlink we don't want.
 679                  */
 680                 return status;
 681         }
 682
 683         if (!NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
 684                 /*
 685                  * Only retry on ENOENT
 686                  */
 687                 return status;
 688         }
 689
 690         if (posix || dirfsp->conn->case_sensitive) {
 691                 /*
 692                  * Only return case insensitive if required
 693                  */
 694                 return status;
 695         }
 696
 697         if (lp_stat_cache()) {
 698                 char *base_name = smb_fname_rel->base_name;
 699                 char *original_relname = NULL;
 700                 DATA_BLOB value = { .data = NULL };
 701
 702                 ok = get_real_filename_cache_key(
 703                         talloc_tos(), dirfsp, base_name, &cache_key);
 704                 if (!ok) {
 705                         /*
 706                          * probably ENOMEM, just bail
 707                          */
 708                         return status;
 709                 }
 710
 711                 DO_PROFILE_INC(statcache_lookups);
 712
 713                 ok = memcache_lookup(
 714                         NULL, GETREALFILENAME_CACHE, cache_key, &value);
 715                 if (!ok) {
 716                         DO_PROFILE_INC(statcache_misses);
 717                         goto lookup;
 718                 }
 719                 DO_PROFILE_INC(statcache_hits);
 720
 721                 /*
 722                  * For the "new filename" case we need to preserve the
 723                  * capitalization the client sent us, see
 724                  * https://bugzilla.samba.org/show_bug.cgi?id=15481
 725                  */
 726                 original_relname = smb_fname_rel->base_name;
 727
 728                 smb_fname_rel->base_name = talloc_memdup(
 729                         smb_fname_rel, value.data, value.length);
 730                 if (smb_fname_rel->base_name == NULL) {
 731                         TALLOC_FREE(cache_key.data);
 732                         return NT_STATUS_NO_MEMORY;
 733                 }
 734
 735                 if (IS_VETO_PATH(dirfsp->conn, smb_fname_rel->base_name)) {
 736                         DBG_DEBUG("veto files rejecting last component %s\n",
 737                                   smb_fname_str_dbg(smb_fname_rel));
 738                         TALLOC_FREE(cache_key.data);
 739                         return NT_STATUS_NETWORK_OPEN_RESTRICTION;
 740                 }
 741
 742                 status = openat_pathref_fsp(dirfsp, smb_fname_rel);
 743                 if (NT_STATUS_IS_OK(status)) {
 744                         TALLOC_FREE(cache_key.data);
 745                         TALLOC_FREE(original_relname);
 746                         return NT_STATUS_OK;
 747                 }
 748
 749                 memcache_delete(NULL, GETREALFILENAME_CACHE, cache_key);
 750                 TALLOC_FREE(smb_fname_rel->base_name);
 751                 smb_fname_rel->base_name = original_relname;
 752         }
 753
 754 lookup:
 755         status = get_real_filename_at(
 756                 dirfsp, smb_fname_rel->base_name, smb_fname_rel, &found_name);
 757         if (NT_STATUS_EQUAL(status, NT_STATUS_ACCESS_DENIED) &&
 758             (ucf_flags & UCF_PREP_CREATEFILE)) {
 759                 /*
 760                  * dropbox
 761                  */
 762                 status = NT_STATUS_OBJECT_NAME_NOT_FOUND;
 763         }
 764
 765         if (NT_STATUS_IS_OK(status)) {
 766                 TALLOC_FREE(smb_fname_rel->base_name);
 767                 smb_fname_rel->base_name = found_name;
 768
 769                 if (IS_VETO_PATH(dirfsp->conn, smb_fname_rel->base_name)) {
 770                         DBG_DEBUG("veto files rejecting last component %s\n",
 771                                 smb_fname_str_dbg(smb_fname_rel));
 772                         return NT_STATUS_NETWORK_OPEN_RESTRICTION;
 773                 }
 774
 775                 status = openat_pathref_fsp(dirfsp, smb_fname_rel);
 776         }
 777
 778         if (NT_STATUS_IS_OK(status) && (cache_key.data != NULL)) {
 779                 DATA_BLOB value = {
 780                         .data = (uint8_t *)smb_fname_rel->base_name,
 781                         .length = strlen(smb_fname_rel->base_name) + 1,
 782                 };
 783
 784                 memcache_add(NULL, GETREALFILENAME_CACHE, cache_key, value);
 785         }
 786
 787         TALLOC_FREE(cache_key.data);
 788
 789         return status;
 790 }
 791
 792 static const char *previous_slash(const char *name_in, const char *slash)
 793 {
 794         const char *prev = NULL;
 795
 796         SMB_ASSERT((name_in <= slash) && (slash[0] == '/'));
 797
 798         prev = strchr_m(name_in, '/');
 799
 800         if (prev == slash) {
 801                 /* No previous slash */
 802                 return NULL;
 803         }
 804
 805         while (true) {
 806                 const char *next = strchr_m(prev + 1, '/');
 807
 808                 if (next == slash) {
 809                         return prev;
 810                 }
 811                 prev = next;
 812         }
 813
 814         return NULL; /* unreachable */
 815 }
 816
 817 static char *symlink_target_path(
 818         TALLOC_CTX *mem_ctx,
 819         const char *name_in,
 820         const char *substitute,
 821         size_t unparsed)
 822 {
 823         size_t name_in_len = strlen(name_in);
 824         const char *p_unparsed = NULL;
 825         const char *parent = NULL;
 826         char *ret;
 827
 828         SMB_ASSERT(unparsed <= name_in_len);
 829
 830         p_unparsed = name_in + (name_in_len - unparsed);
 831
 832         if (substitute[0] == '/') {
 833                 ret = talloc_asprintf(mem_ctx, "%s%s", substitute, p_unparsed);
 834                 return ret;
 835         }
 836
 837         if (unparsed == 0) {
 838                 parent = strrchr_m(name_in, '/');
 839         } else {
 840                 parent = previous_slash(name_in, p_unparsed);
 841         }
 842
 843         if (parent == NULL) {
 844                 ret = talloc_asprintf(mem_ctx, "%s%s", substitute, p_unparsed);
 845         } else {
 846                 ret = talloc_asprintf(mem_ctx,
 847                                       "%.*s/%s%s",
 848                                       (int)(parent - name_in),
 849                                       name_in,
 850                                       substitute,
 851                                       p_unparsed);
 852         }
 853
 854         return ret;
 855 }
 856
 857 static NTSTATUS safe_symlink_target_path(
 858         TALLOC_CTX *mem_ctx,
 859         const char *connectpath,
 860         const char *name_in,
 861         const char *substitute,
 862         size_t unparsed,
 863         char **_name_out)
 864 {
 865         char *target = NULL;
 866         char *abs_target = NULL;
 867         char *abs_target_canon = NULL;
 868         const char *relative = NULL;
 869         char *name_out = NULL;
 870         NTSTATUS status = NT_STATUS_NO_MEMORY;
 871         bool in_share;
 872
 873         target = symlink_target_path(mem_ctx, name_in, substitute, unparsed);
 874         if (target == NULL) {
 875                 goto fail;
 876         }
 877
 878         DBG_DEBUG("name_in: %s, substitute: %s, unparsed: %zu, target=%s\n",
 879                   name_in,
 880                   substitute,
 881                   unparsed,
 882                   target);
 883
 884         if (target[0] == '/') {
 885                 abs_target = target;
 886         } else {
 887                 abs_target = talloc_asprintf(
 888                         target, "%s/%s", connectpath, target);
 889                 if (abs_target == NULL) {
 890                         goto fail;
 891                 }
 892         }
 893
 894         abs_target_canon = canonicalize_absolute_path(target, abs_target);
 895         if (abs_target_canon == NULL) {
 896                 goto fail;
 897         }
 898
 899         DBG_DEBUG("abs_target_canon=%s\n", abs_target_canon);
 900
 901         in_share = subdir_of(
 902                 connectpath, strlen(connectpath), abs_target_canon, &relative);
 903         if (!in_share) {
 904                 DBG_DEBUG("wide link to %s\n", abs_target_canon);
 905                 status = (unparsed != 0) ? NT_STATUS_OBJECT_PATH_NOT_FOUND
 906                                          : NT_STATUS_OBJECT_NAME_NOT_FOUND;
 907                 goto fail;
 908         }
 909
 910         name_out = talloc_strdup(mem_ctx, relative);
 911         if (name_out == NULL) {
 912                 goto fail;
 913         }
 914
 915         status = NT_STATUS_OK;
 916         *_name_out = name_out;
 917 fail:
 918         TALLOC_FREE(target);
 919         return status;
 920 }
 921
 922 /*
 923  * Split up name_in as sent by the client into a directory pathref fsp
 924  * and a relative smb_filename.
 925  */
 926 static NTSTATUS filename_convert_dirfsp_nosymlink(
 927         TALLOC_CTX *mem_ctx,
 928         connection_struct *conn,
 929         const char *name_in,
 930         uint32_t ucf_flags,
 931         NTTIME twrp,
 932         struct files_struct **_dirfsp,
 933         struct smb_filename **_smb_fname,
 934         struct open_symlink_err **_symlink_err)
 935 {
 936         struct smb_filename *smb_dirname = NULL;
 937         struct smb_filename *smb_fname_rel = NULL;
 938         struct smb_filename *smb_fname = NULL;
 939         const bool posix = (ucf_flags & UCF_POSIX_PATHNAMES);
 940         char *dirname = NULL;
 941         const char *fname_rel = NULL;
 942         const char *streamname = NULL;
 943         char *saved_streamname = NULL;
 944         struct files_struct *base_fsp = NULL;
 945         bool ok;
 946         NTSTATUS status = NT_STATUS_UNSUCCESSFUL;
 947
 948         SMB_ASSERT(!(ucf_flags & UCF_DFS_PATHNAME));
 949
 950         if (is_fake_file_path(name_in)) {
 951                 smb_fname = synthetic_smb_fname_split(mem_ctx, name_in, posix);
 952                 if (smb_fname == NULL) {
 953                         return NT_STATUS_NO_MEMORY;
 954                 }
 955                 smb_fname->st = (SMB_STRUCT_STAT){
 956                         .st_ex_nlink = 1,
 957                         .st_ex_mode = S_IFREG | 0644,
 958                 };
 959                 smb_fname->st.st_ex_btime =
 960                         (struct timespec){0, SAMBA_UTIME_OMIT};
 961                 smb_fname->st.st_ex_atime =
 962                         (struct timespec){0, SAMBA_UTIME_OMIT};
 963                 smb_fname->st.st_ex_mtime =
 964                         (struct timespec){0, SAMBA_UTIME_OMIT};
 965                 smb_fname->st.st_ex_ctime =
 966                         (struct timespec){0, SAMBA_UTIME_OMIT};
 967
 968                 *_dirfsp = conn->cwd_fsp;
 969                 *_smb_fname = smb_fname;
 970                 return NT_STATUS_OK;
 971         }
 972
 973         /*
 974          * Catch an invalid path of "." before we
 975          * call filename_split_lcomp(). We need to
 976          * do this as filename_split_lcomp() will
 977          * use "." for the missing relative component
 978          * when an empty name_in path is sent by
 979          * the client.
 980          */
 981         if (ISDOT(name_in)) {
 982                 status = NT_STATUS_OBJECT_NAME_INVALID;
 983                 goto fail;
 984         }
 985
 986         ok = filename_split_lcomp(
 987                 talloc_tos(),
 988                 name_in,
 989                 posix,
 990                 &dirname,
 991                 &fname_rel,
 992                 &streamname);
 993         if (!ok) {
 994                 status = NT_STATUS_NO_MEMORY;
 995                 goto fail;
 996         }
 997
 998         if ((streamname != NULL) &&
 999             ((conn->fs_capabilities & FILE_NAMED_STREAMS) == 0)) {
1000                 status = NT_STATUS_OBJECT_NAME_INVALID;
1001                 goto fail;
1002         }
1003
1004         if (!posix) {
1005                 bool name_has_wild = ms_has_wild(dirname);
1006                 name_has_wild |= ms_has_wild(fname_rel);
1007                 if (name_has_wild) {
1008                         status = NT_STATUS_OBJECT_NAME_INVALID;
1009                         goto fail;
1010                 }
1011         }
1012
1013         if (dirname[0] == '\0') {
1014                 status = synthetic_pathref(
1015                         mem_ctx,
1016                         conn->cwd_fsp,
1017                         ".",
1018                         NULL,
1019                         NULL,
1020                         0,
1021                         posix ? SMB_FILENAME_POSIX_PATH : 0,
1022                         &smb_dirname);
1023         } else {
1024                 struct open_symlink_err *symlink_err = NULL;
1025
1026                 status = normalize_filename_case(conn, dirname, ucf_flags);
1027                 if (!NT_STATUS_IS_OK(status)) {
1028                         DBG_ERR("normalize_filename_case %s failed: %s\n",
1029                                 dirname,
1030                                 nt_errstr(status));
1031                         goto fail;
1032                 }
1033
1034                 status = openat_pathref_fsp_nosymlink(mem_ctx,
1035                                                       conn,
1036                                                       conn->cwd_fsp,
1037                                                       dirname,
1038                                                       0,
1039                                                       posix,
1040                                                       &smb_dirname,
1041                                                       &symlink_err);
1042
1043                 if (NT_STATUS_EQUAL(status, NT_STATUS_STOPPED_ON_SYMLINK)) {
1044                         size_t name_in_len, dirname_len;
1045
1046                         if (lp_host_msdfs() && lp_msdfs_root(SNUM(conn)) &&
1047                             strnequal(symlink_err->reparse->substitute_name,
1048                                       "msdfs:",
1049                                       6)) {
1050                                 status = NT_STATUS_PATH_NOT_COVERED;
1051                                 goto fail;
1052                         }
1053
1054                         name_in_len = strlen(name_in);
1055                         dirname_len = strlen(dirname);
1056
1057                         SMB_ASSERT(name_in_len >= dirname_len);
1058
1059                         symlink_err->unparsed += (name_in_len - dirname_len);
1060                         *_symlink_err = symlink_err;
1061
1062                         goto fail;
1063                 }
1064         }
1065
1066         if (!NT_STATUS_IS_OK(status)) {
1067                 DBG_DEBUG("opening directory %s failed: %s\n",
1068                           dirname,
1069                           nt_errstr(status));
1070                 TALLOC_FREE(dirname);
1071
1072                 if (!NT_STATUS_EQUAL(status, NT_STATUS_ACCESS_DENIED)) {
1073                         /*
1074                          * Except ACCESS_DENIED, everything else leads
1075                          * to PATH_NOT_FOUND.
1076                          */
1077                         status = NT_STATUS_OBJECT_PATH_NOT_FOUND;
1078                 }
1079
1080                 goto fail;
1081         }
1082
1083         if (!VALID_STAT_OF_DIR(smb_dirname->st)) {
1084                 status = NT_STATUS_OBJECT_PATH_NOT_FOUND;
1085                 goto fail;
1086         }
1087         smb_dirname->fsp->fsp_flags.is_directory = true;
1088
1089         /*
1090          * Only look at bad last component values
1091          * once we know we have a valid directory. That
1092          * way we won't confuse error messages from
1093          * opening the directory path with error
1094          * messages from a bad last component.
1095          */
1096
1097         /* Relative filename can't be empty */
1098         if (fname_rel[0] == '\0') {
1099                 status = NT_STATUS_OBJECT_NAME_INVALID;
1100                 goto fail;
1101         }
1102
1103         /* Relative filename can't be ".." */
1104         if (ISDOTDOT(fname_rel)) {
1105                 status = NT_STATUS_OBJECT_NAME_INVALID;
1106                 goto fail;
1107         }
1108         /* Relative name can only be dot if directory is empty. */
1109         if (ISDOT(fname_rel) && dirname[0] != '\0') {
1110                 status = NT_STATUS_OBJECT_NAME_INVALID;
1111                 goto fail;
1112         }
1113
1114         TALLOC_FREE(dirname);
1115
1116         smb_fname_rel = synthetic_smb_fname(
1117                 mem_ctx,
1118                 fname_rel,
1119                 streamname,
1120                 NULL,
1121                 twrp,
1122                 posix ? SMB_FILENAME_POSIX_PATH : 0);
1123         if (smb_fname_rel == NULL) {
1124                 status = NT_STATUS_NO_MEMORY;
1125                 goto fail;
1126         }
1127
1128         if ((conn->fs_capabilities & FILE_NAMED_STREAMS) &&
1129             is_named_stream(smb_fname_rel)) {
1130                 /*
1131                  * Find the base_fsp first without the stream.
1132                  */
1133                 saved_streamname = smb_fname_rel->stream_name;
1134                 smb_fname_rel->stream_name = NULL;
1135         }
1136
1137         status = normalize_filename_case(
1138                 conn, smb_fname_rel->base_name, ucf_flags);
1139         if (!NT_STATUS_IS_OK(status)) {
1140                 DBG_ERR("normalize_filename_case %s failed: %s\n",
1141                         smb_fname_rel->base_name,
1142                         nt_errstr(status));
1143                 goto fail;
1144         }
1145
1146         status = openat_pathref_fsp_case_insensitive(
1147                 smb_dirname->fsp, smb_fname_rel, ucf_flags);
1148
1149         if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND) &&
1150             VALID_STAT(smb_fname_rel->st) &&
1151             S_ISLNK(smb_fname_rel->st.st_ex_mode)) {
1152
1153                 /*
1154                  * If we're on an MSDFS share, see if this is
1155                  * an MSDFS link.
1156                  */
1157                 if (lp_host_msdfs() &&
1158                     lp_msdfs_root(SNUM(conn)) &&
1159                     is_msdfs_link(smb_dirname->fsp, smb_fname_rel))
1160                 {
1161                         status = NT_STATUS_PATH_NOT_COVERED;
1162                         goto fail;
1163                 }
1164
1165 #if defined(WITH_SMB1SERVER)
1166                 /*
1167                  * In SMB1 posix mode, if this is a symlink,
1168                  * allow access to the name with a NULL smb_fname->fsp.
1169                  */
1170                 if (ucf_flags & UCF_LCOMP_LNK_OK) {
1171                         SMB_ASSERT(smb_fname_rel->fsp == NULL);
1172                         SMB_ASSERT(streamname == NULL);
1173
1174                         smb_fname = full_path_from_dirfsp_atname(
1175                                 mem_ctx,
1176                                 smb_dirname->fsp,
1177                                 smb_fname_rel);
1178                         if (smb_fname == NULL) {
1179                                 status = NT_STATUS_NO_MEMORY;
1180                                 goto fail;
1181                         }
1182                         goto done;
1183                 }
1184 #endif
1185         }
1186
1187         if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND) &&
1188             !VALID_STAT(smb_fname_rel->st)) {
1189
1190                 char *normalized = NULL;
1191
1192                 /*
1193                  * Creating a new file
1194                  */
1195
1196                 status = filename_convert_normalize_new(
1197                         smb_fname_rel,
1198                         conn,
1199                         smb_fname_rel->base_name,
1200                         &normalized);
1201                 if (!NT_STATUS_IS_OK(status)) {
1202                         DBG_DEBUG("filename_convert_normalize_new failed: "
1203                                   "%s\n",
1204                                   nt_errstr(status));
1205                         goto fail;
1206                 }
1207                 if (normalized != NULL) {
1208                         smb_fname_rel->base_name = normalized;
1209                 }
1210
1211                 smb_fname_rel->stream_name = saved_streamname;
1212
1213                 smb_fname = full_path_from_dirfsp_atname(
1214                         mem_ctx, smb_dirname->fsp, smb_fname_rel);
1215                 if (smb_fname == NULL) {
1216                         status = NT_STATUS_NO_MEMORY;
1217                         goto fail;
1218                 }
1219                 goto done;
1220         }
1221
1222         if (NT_STATUS_EQUAL(status, NT_STATUS_NETWORK_OPEN_RESTRICTION)) {
1223                 /* A vetoed file, pretend it's not there  */
1224                 status = NT_STATUS_OBJECT_NAME_NOT_FOUND;
1225         }
1226         if (!NT_STATUS_IS_OK(status)) {
1227                 goto fail;
1228         }
1229
1230         if (saved_streamname == NULL) {
1231                 /* smb_fname must be allocated off mem_ctx. */
1232                 smb_fname = cp_smb_filename(mem_ctx,
1233                                             smb_fname_rel->fsp->fsp_name);
1234                 if (smb_fname == NULL) {
1235                         goto fail;
1236                 }
1237                 status = move_smb_fname_fsp_link(smb_fname, smb_fname_rel);
1238                 if (!NT_STATUS_IS_OK(status)) {
1239                         goto fail;
1240                 }
1241                 goto done;
1242         }
1243
1244         base_fsp = smb_fname_rel->fsp;
1245         smb_fname_fsp_unlink(smb_fname_rel);
1246         SET_STAT_INVALID(smb_fname_rel->st);
1247
1248         smb_fname_rel->stream_name = saved_streamname;
1249
1250         status = open_stream_pathref_fsp(&base_fsp, smb_fname_rel);
1251
1252         if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND) &&
1253             !conn->case_sensitive) {
1254                 char *found = NULL;
1255
1256                 status = get_real_stream_name(
1257                         smb_fname_rel,
1258                         base_fsp,
1259                         smb_fname_rel->stream_name,
1260                         &found);
1261
1262                 if (NT_STATUS_IS_OK(status)) {
1263                         smb_fname_rel->stream_name = found;
1264                         found = NULL;
1265                         status = open_stream_pathref_fsp(
1266                                 &base_fsp, smb_fname_rel);
1267                 }
1268         }
1269
1270         if (NT_STATUS_IS_OK(status)) {
1271                 /* smb_fname must be allocated off mem_ctx. */
1272                 smb_fname = cp_smb_filename(mem_ctx,
1273                                             smb_fname_rel->fsp->fsp_name);
1274                 if (smb_fname == NULL) {
1275                         goto fail;
1276                 }
1277                 status = move_smb_fname_fsp_link(smb_fname, smb_fname_rel);
1278                 if (!NT_STATUS_IS_OK(status)) {
1279                         goto fail;
1280                 }
1281                 goto done;
1282         }
1283
1284         if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
1285                 /*
1286                  * Creating a new stream
1287                  *
1288                  * We should save the already-open base fsp for
1289                  * create_file_unixpath() somehow.
1290                  */
1291                 smb_fname = full_path_from_dirfsp_atname(
1292                         mem_ctx, smb_dirname->fsp, smb_fname_rel);
1293                 if (smb_fname == NULL) {
1294                         status = NT_STATUS_NO_MEMORY;
1295                         goto fail;
1296                 }
1297                 /*
1298                  * When open_stream_pathref_fsp() returns
1299                  * NT_STATUS_OBJECT_NAME_NOT_FOUND, smb_fname_rel->fsp
1300                  * has been set to NULL, so we must free base_fsp separately
1301                  * to prevent fd-leaks when opening a stream that doesn't
1302                  * exist.
1303                  */
1304                 fd_close(base_fsp);
1305                 file_free(NULL, base_fsp);
1306                 base_fsp = NULL;
1307                 goto done;
1308         }
1309
1310         if (!NT_STATUS_IS_OK(status)) {
1311                 goto fail;
1312         }
1313
1314 done:
1315         *_dirfsp = smb_dirname->fsp;
1316         *_smb_fname = smb_fname;
1317
1318         smb_fname_fsp_unlink(smb_fname_rel);
1319         TALLOC_FREE(smb_fname_rel);
1320         return NT_STATUS_OK;
1321
1322 fail:
1323         /*
1324          * If open_stream_pathref_fsp() returns an error, smb_fname_rel->fsp
1325          * has been set to NULL, so we must free base_fsp separately
1326          * to prevent fd-leaks when opening a stream that doesn't
1327          * exist.
1328          */
1329         if (base_fsp != NULL) {
1330                 fd_close(base_fsp);
1331                 file_free(NULL, base_fsp);
1332                 base_fsp = NULL;
1333         }
1334         TALLOC_FREE(dirname);
1335         TALLOC_FREE(smb_dirname);
1336         TALLOC_FREE(smb_fname_rel);
1337         return status;
1338 }
1339
1340 NTSTATUS filename_convert_dirfsp(
1341         TALLOC_CTX *mem_ctx,
1342         connection_struct *conn,
1343         const char *name_in,
1344         uint32_t ucf_flags,
1345         NTTIME twrp,
1346         struct files_struct **_dirfsp,
1347         struct smb_filename **_smb_fname)
1348 {
1349         struct open_symlink_err *symlink_err = NULL;
1350         NTSTATUS status;
1351         char *substitute = NULL;
1352         char *target = NULL;
1353         size_t symlink_redirects = 0;
1354
1355 next:
1356         if (symlink_redirects > 40) {
1357                 return NT_STATUS_OBJECT_PATH_NOT_FOUND;
1358         }
1359
1360         status = filename_convert_dirfsp_nosymlink(mem_ctx,
1361                                                    conn,
1362                                                    name_in,
1363                                                    ucf_flags,
1364                                                    twrp,
1365                                                    _dirfsp,
1366                                                    _smb_fname,
1367                                                    &symlink_err);
1368
1369         if (!NT_STATUS_EQUAL(status, NT_STATUS_STOPPED_ON_SYMLINK)) {
1370                 return status;
1371         }
1372
1373         if (!lp_follow_symlinks(SNUM(conn))) {
1374                 status = (symlink_err->unparsed == 0)
1375                                  ? NT_STATUS_OBJECT_NAME_NOT_FOUND
1376                                  : NT_STATUS_OBJECT_PATH_NOT_FOUND;
1377                 TALLOC_FREE(symlink_err);
1378                 return status;
1379         }
1380
1381         /*
1382          * Right now, SMB2 and SMB1 always traverse symlinks
1383          * within the share. SMB1+POSIX traverses non-terminal
1384          * symlinks within the share.
1385          *
1386          * When we add SMB2+POSIX we need to return
1387          * a NT_STATUS_STOPPED_ON_SYMLINK error here, using the
1388          * symlink target data read below if SMB2+POSIX has
1389          * UCF_POSIX_PATHNAMES set to cause the client to
1390          * resolve all symlinks locally.
1391          */
1392
1393         substitute = symlink_err->reparse->substitute_name;
1394
1395         status = safe_symlink_target_path(mem_ctx,
1396                                           conn->connectpath,
1397                                           name_in,
1398                                           substitute,
1399                                           symlink_err->unparsed,
1400                                           &target);
1401         TALLOC_FREE(symlink_err);
1402         if (!NT_STATUS_IS_OK(status)) {
1403                 return status;
1404         }
1405         name_in = target;
1406
1407         symlink_redirects += 1;
1408
1409         goto next;
1410 }
1411
1412 char *full_path_from_dirfsp_at_basename(TALLOC_CTX *mem_ctx,
1413                                         const struct files_struct *dirfsp,
1414                                         const char *at_base_name)
1415 {
1416         char *path = NULL;
1417
1418         if (dirfsp == dirfsp->conn->cwd_fsp ||
1419             ISDOT(dirfsp->fsp_name->base_name) || at_base_name[0] == '/') {
1420                 path = talloc_strdup(mem_ctx, at_base_name);
1421         } else {
1422                 path = talloc_asprintf(mem_ctx,
1423                                        "%s/%s",
1424                                        dirfsp->fsp_name->base_name,
1425                                        at_base_name);
1426         }
1427
1428         return path;
1429 }
1430
1431 /*
1432  * Build the full path from a dirfsp and dirfsp relative name
1433  */
1434 struct smb_filename *
1435 full_path_from_dirfsp_atname(TALLOC_CTX *mem_ctx,
1436                              const struct files_struct *dirfsp,
1437                              const struct smb_filename *atname)
1438 {
1439         struct smb_filename *fname = NULL;
1440         char *path = NULL;
1441
1442         path = full_path_from_dirfsp_at_basename(mem_ctx,
1443                                                  dirfsp,
1444                                                  atname->base_name);
1445         if (path == NULL) {
1446                 return NULL;
1447         }
1448
1449         fname = synthetic_smb_fname(mem_ctx,
1450                                     path,
1451                                     atname->stream_name,
1452                                     &atname->st,
1453                                     atname->twrp,
1454                                     atname->flags);
1455         TALLOC_FREE(path);
1456         if (fname == NULL) {
1457                 return NULL;
1458         }
1459
1460         return fname;
1461 }