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 static bool get_real_filename_cache_key(
 418         TALLOC_CTX *mem_ctx,
 419         struct files_struct *dirfsp,
 420         const char *name,
 421         DATA_BLOB *_key)
 422 {
 423         struct file_id fid = vfs_file_id_from_sbuf(
 424                 dirfsp->conn, &dirfsp->fsp_name->st);
 425         char *upper = NULL;
 426         uint8_t *key = NULL;
 427         size_t namelen, keylen;
 428
 429         upper = talloc_strdup_upper(mem_ctx, name);
 430         if (upper == NULL) {
 431                 return false;
 432         }
 433         namelen = talloc_get_size(upper);
 434
 435         keylen = namelen + sizeof(fid);
 436         if (keylen < sizeof(fid)) {
 437                 TALLOC_FREE(upper);
 438                 return false;
 439         }
 440
 441         key = talloc_size(mem_ctx, keylen);
 442         if (key == NULL) {
 443                 TALLOC_FREE(upper);
 444                 return false;
 445         }
 446
 447         memcpy(key, &fid, sizeof(fid));
 448         memcpy(key + sizeof(fid), upper, namelen);
 449         TALLOC_FREE(upper);
 450
 451         *_key = (DATA_BLOB) { .data = key, .length = keylen, };
 452         return true;
 453 }
 454
 455 /*
 456  * Lightweight function to just get last component
 457  * for rename / enumerate directory calls.
 458  */
 459
 460 char *get_original_lcomp(TALLOC_CTX *ctx,
 461                         connection_struct *conn,
 462                         const char *filename_in,
 463                         uint32_t ucf_flags)
 464 {
 465         char *last_slash = NULL;
 466         char *orig_lcomp;
 467         NTSTATUS status;
 468
 469         last_slash = strrchr(filename_in, '/');
 470         if (last_slash != NULL) {
 471                 orig_lcomp = talloc_strdup(ctx, last_slash+1);
 472         } else {
 473                 orig_lcomp = talloc_strdup(ctx, filename_in);
 474         }
 475         if (orig_lcomp == NULL) {
 476                 return NULL;
 477         }
 478         status = normalize_filename_case(conn, orig_lcomp, ucf_flags);
 479         if (!NT_STATUS_IS_OK(status)) {
 480                 TALLOC_FREE(orig_lcomp);
 481                 return NULL;
 482         }
 483         return orig_lcomp;
 484 }
 485
 486 /*
 487  * Get the correct capitalized stream name hanging off
 488  * base_fsp. Equivalent of get_real_filename(), but for streams.
 489  */
 490 static NTSTATUS get_real_stream_name(
 491         TALLOC_CTX *mem_ctx,
 492         struct files_struct *base_fsp,
 493         const char *stream_name,
 494         char **_found)
 495 {
 496         unsigned int i, num_streams = 0;
 497         struct stream_struct *streams = NULL;
 498         NTSTATUS status;
 499
 500         status = vfs_fstreaminfo(
 501                 base_fsp, talloc_tos(), &num_streams, &streams);
 502         if (!NT_STATUS_IS_OK(status)) {
 503                 return status;
 504         }
 505
 506         for (i=0; i<num_streams; i++) {
 507                 bool equal = sname_equal(stream_name, streams[i].name, false);
 508
 509                 DBG_DEBUG("comparing [%s] and [%s]: %sequal\n",
 510                           stream_name,
 511                           streams[i].name,
 512                           equal ? "" : "not ");
 513
 514                 if (equal) {
 515                         *_found = talloc_move(mem_ctx, &streams[i].name);
 516                         TALLOC_FREE(streams);
 517                         return NT_STATUS_OK;
 518                 }
 519         }
 520
 521         TALLOC_FREE(streams);
 522         return NT_STATUS_OBJECT_NAME_NOT_FOUND;
 523 }
 524
 525 static bool filename_split_lcomp(
 526         TALLOC_CTX *mem_ctx,
 527         const char *name_in,
 528         bool posix,
 529         char **_dirname,
 530         const char **_fname_rel,
 531         const char **_streamname)
 532 {
 533         const char *lcomp = NULL;
 534         const char *fname_rel = NULL;
 535         const char *streamname = NULL;
 536         char *dirname = NULL;
 537
 538         if (name_in[0] == '\0') {
 539                 fname_rel = ".";
 540                 dirname = talloc_strdup(mem_ctx, "");
 541                 if (dirname == NULL) {
 542                         return false;
 543                 }
 544                 goto done;
 545         }
 546
 547         lcomp = strrchr_m(name_in, '/');
 548         if (lcomp != NULL) {
 549                 fname_rel = lcomp+1;
 550                 dirname = talloc_strndup(mem_ctx, name_in, lcomp - name_in);
 551                 if (dirname == NULL) {
 552                         return false;
 553                 }
 554                 goto find_stream;
 555         }
 556
 557         /*
 558          * No slash, dir is empty
 559          */
 560         dirname = talloc_strdup(mem_ctx, "");
 561         if (dirname == NULL) {
 562                 return false;
 563         }
 564
 565         if (!posix && (name_in[0] == ':')) {
 566                 /*
 567                  * Special case for stream on root directory
 568                  */
 569                 fname_rel = ".";
 570                 streamname = name_in;
 571                 goto done;
 572         }
 573
 574         fname_rel = name_in;
 575
 576 find_stream:
 577         if (!posix) {
 578                 streamname = strchr_m(fname_rel, ':');
 579
 580                 if (streamname != NULL) {
 581                         fname_rel = talloc_strndup(
 582                                 mem_ctx,
 583                                 fname_rel,
 584                                 streamname - fname_rel);
 585                         if (fname_rel == NULL) {
 586                                 TALLOC_FREE(dirname);
 587                                 return false;
 588                         }
 589                 }
 590         }
 591
 592 done:
 593         *_dirname = dirname;
 594         *_fname_rel = fname_rel;
 595         *_streamname = streamname;
 596         return true;
 597 }
 598
 599 /*
 600  * Create the correct capitalization of a file name to be created.
 601  */
 602 static NTSTATUS filename_convert_normalize_new(
 603         TALLOC_CTX *mem_ctx,
 604         struct connection_struct *conn,
 605         char *name_in,
 606         char **_normalized)
 607 {
 608         char *name = name_in;
 609
 610         *_normalized = NULL;
 611
 612         if (!conn->case_preserve ||
 613             (mangle_is_8_3(name, false,
 614                            conn->params) &&
 615              !conn->short_case_preserve)) {
 616
 617                 char *normalized = talloc_strdup(mem_ctx, name);
 618                 if (normalized == NULL) {
 619                         return NT_STATUS_NO_MEMORY;
 620                 }
 621
 622                 strnorm(normalized, lp_default_case(SNUM(conn)));
 623                 name = normalized;
 624         }
 625
 626         if (mangle_is_mangled(name, conn->params)) {
 627                 bool found;
 628                 char *unmangled = NULL;
 629
 630                 found = mangle_lookup_name_from_8_3(
 631                         mem_ctx, name, &unmangled, conn->params);
 632                 if (found) {
 633                         name = unmangled;
 634                 }
 635         }
 636
 637         if (name != name_in) {
 638                 *_normalized = name;
 639         }
 640
 641         return NT_STATUS_OK;
 642 }
 643
 644 /*
 645  * Open smb_fname_rel->fsp as a pathref fsp with a case insensitive
 646  * fallback using GETREALFILENAME_CACHE and get_real_filename_at() if
 647  * the first attempt based on the filename sent by the client gives
 648  * ENOENT.
 649  */
 650 static NTSTATUS openat_pathref_fsp_case_insensitive(
 651         struct files_struct *dirfsp,
 652         struct smb_filename *smb_fname_rel,
 653         uint32_t ucf_flags)
 654 {
 655         const bool posix = (ucf_flags & UCF_POSIX_PATHNAMES);
 656         DATA_BLOB cache_key = { .data = NULL, };
 657         char *found_name = NULL;
 658         NTSTATUS status;
 659         bool ok;
 660
 661         SET_STAT_INVALID(smb_fname_rel->st);
 662
 663         /* Check veto files - only looks at last component. */
 664         if (IS_VETO_PATH(dirfsp->conn, smb_fname_rel->base_name)) {
 665                 DBG_DEBUG("veto files rejecting last component %s\n",
 666                           smb_fname_str_dbg(smb_fname_rel));
 667                 return NT_STATUS_NETWORK_OPEN_RESTRICTION;
 668         }
 669
 670         status = openat_pathref_fsp(dirfsp, smb_fname_rel);
 671
 672         if (NT_STATUS_IS_OK(status)) {
 673                 return NT_STATUS_OK;
 674         }
 675
 676         if (VALID_STAT(smb_fname_rel->st)) {
 677                 /*
 678                  * We got an error although the object existed. Might
 679                  * be a symlink we don't want.
 680                  */
 681                 return status;
 682         }
 683
 684         if (!NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
 685                 /*
 686                  * Only retry on ENOENT
 687                  */
 688                 return status;
 689         }
 690
 691         if (posix || dirfsp->conn->case_sensitive) {
 692                 /*
 693                  * Only return case insensitive if required
 694                  */
 695                 return status;
 696         }
 697
 698         if (lp_stat_cache()) {
 699                 char *base_name = smb_fname_rel->base_name;
 700                 char *original_relname = NULL;
 701                 DATA_BLOB value = { .data = NULL };
 702
 703                 ok = get_real_filename_cache_key(
 704                         talloc_tos(), dirfsp, base_name, &cache_key);
 705                 if (!ok) {
 706                         /*
 707                          * probably ENOMEM, just bail
 708                          */
 709                         return status;
 710                 }
 711
 712                 DO_PROFILE_INC(statcache_lookups);
 713
 714                 ok = memcache_lookup(
 715                         NULL, GETREALFILENAME_CACHE, cache_key, &value);
 716                 if (!ok) {
 717                         DO_PROFILE_INC(statcache_misses);
 718                         goto lookup;
 719                 }
 720                 DO_PROFILE_INC(statcache_hits);
 721
 722                 /*
 723                  * For the "new filename" case we need to preserve the
 724                  * capitalization the client sent us, see
 725                  * https://bugzilla.samba.org/show_bug.cgi?id=15481
 726                  */
 727                 original_relname = smb_fname_rel->base_name;
 728
 729                 smb_fname_rel->base_name = talloc_memdup(
 730                         smb_fname_rel, value.data, value.length);
 731                 if (smb_fname_rel->base_name == NULL) {
 732                         TALLOC_FREE(cache_key.data);
 733                         return NT_STATUS_NO_MEMORY;
 734                 }
 735
 736                 if (IS_VETO_PATH(dirfsp->conn, smb_fname_rel->base_name)) {
 737                         DBG_DEBUG("veto files rejecting last component %s\n",
 738                                   smb_fname_str_dbg(smb_fname_rel));
 739                         TALLOC_FREE(cache_key.data);
 740                         return NT_STATUS_NETWORK_OPEN_RESTRICTION;
 741                 }
 742
 743                 status = openat_pathref_fsp(dirfsp, smb_fname_rel);
 744                 if (NT_STATUS_IS_OK(status)) {
 745                         TALLOC_FREE(cache_key.data);
 746                         TALLOC_FREE(original_relname);
 747                         return NT_STATUS_OK;
 748                 }
 749
 750                 memcache_delete(NULL, GETREALFILENAME_CACHE, cache_key);
 751                 TALLOC_FREE(smb_fname_rel->base_name);
 752                 smb_fname_rel->base_name = original_relname;
 753         }
 754
 755 lookup:
 756         status = get_real_filename_at(
 757                 dirfsp, smb_fname_rel->base_name, smb_fname_rel, &found_name);
 758         if (NT_STATUS_EQUAL(status, NT_STATUS_ACCESS_DENIED) &&
 759             (ucf_flags & UCF_PREP_CREATEFILE)) {
 760                 /*
 761                  * dropbox
 762                  */
 763                 status = NT_STATUS_OBJECT_NAME_NOT_FOUND;
 764         }
 765
 766         if (NT_STATUS_IS_OK(status)) {
 767                 TALLOC_FREE(smb_fname_rel->base_name);
 768                 smb_fname_rel->base_name = found_name;
 769
 770                 if (IS_VETO_PATH(dirfsp->conn, smb_fname_rel->base_name)) {
 771                         DBG_DEBUG("veto files rejecting last component %s\n",
 772                                 smb_fname_str_dbg(smb_fname_rel));
 773                         return NT_STATUS_NETWORK_OPEN_RESTRICTION;
 774                 }
 775
 776                 status = openat_pathref_fsp(dirfsp, smb_fname_rel);
 777         }
 778
 779         if (NT_STATUS_IS_OK(status) && (cache_key.data != NULL)) {
 780                 DATA_BLOB value = {
 781                         .data = (uint8_t *)smb_fname_rel->base_name,
 782                         .length = strlen(smb_fname_rel->base_name) + 1,
 783                 };
 784
 785                 memcache_add(NULL, GETREALFILENAME_CACHE, cache_key, value);
 786         }
 787
 788         TALLOC_FREE(cache_key.data);
 789
 790         return status;
 791 }
 792
 793 static const char *previous_slash(const char *name_in, const char *slash)
 794 {
 795         const char *prev = NULL;
 796
 797         SMB_ASSERT((name_in <= slash) && (slash[0] == '/'));
 798
 799         prev = strchr_m(name_in, '/');
 800
 801         if (prev == slash) {
 802                 /* No previous slash */
 803                 return NULL;
 804         }
 805
 806         while (true) {
 807                 const char *next = strchr_m(prev + 1, '/');
 808
 809                 if (next == slash) {
 810                         return prev;
 811                 }
 812                 prev = next;
 813         }
 814
 815         return NULL; /* unreachable */
 816 }
 817
 818 static char *symlink_target_path(
 819         TALLOC_CTX *mem_ctx,
 820         const char *name_in,
 821         const char *substitute,
 822         size_t unparsed)
 823 {
 824         size_t name_in_len = strlen(name_in);
 825         const char *p_unparsed = NULL;
 826         const char *parent = NULL;
 827         char *ret;
 828
 829         SMB_ASSERT(unparsed <= name_in_len);
 830
 831         p_unparsed = name_in + (name_in_len - unparsed);
 832
 833         if (substitute[0] == '/') {
 834                 ret = talloc_asprintf(mem_ctx, "%s%s", substitute, p_unparsed);
 835                 return ret;
 836         }
 837
 838         if (unparsed == 0) {
 839                 parent = strrchr_m(name_in, '/');
 840         } else {
 841                 parent = previous_slash(name_in, p_unparsed);
 842         }
 843
 844         if (parent == NULL) {
 845                 ret = talloc_asprintf(mem_ctx, "%s%s", substitute, p_unparsed);
 846         } else {
 847                 ret = talloc_asprintf(mem_ctx,
 848                                       "%.*s/%s%s",
 849                                       (int)(parent - name_in),
 850                                       name_in,
 851                                       substitute,
 852                                       p_unparsed);
 853         }
 854
 855         return ret;
 856 }
 857
 858 static NTSTATUS safe_symlink_target_path(
 859         TALLOC_CTX *mem_ctx,
 860         const char *connectpath,
 861         const char *name_in,
 862         const char *substitute,
 863         size_t unparsed,
 864         char **_name_out)
 865 {
 866         char *target = NULL;
 867         char *abs_target = NULL;
 868         char *abs_target_canon = NULL;
 869         const char *relative = NULL;
 870         char *name_out = NULL;
 871         NTSTATUS status = NT_STATUS_NO_MEMORY;
 872         bool in_share;
 873
 874         target = symlink_target_path(mem_ctx, name_in, substitute, unparsed);
 875         if (target == NULL) {
 876                 goto fail;
 877         }
 878
 879         DBG_DEBUG("name_in: %s, substitute: %s, unparsed: %zu, target=%s\n",
 880                   name_in,
 881                   substitute,
 882                   unparsed,
 883                   target);
 884
 885         if (target[0] == '/') {
 886                 abs_target = target;
 887         } else {
 888                 abs_target = talloc_asprintf(
 889                         target, "%s/%s", connectpath, target);
 890                 if (abs_target == NULL) {
 891                         goto fail;
 892                 }
 893         }
 894
 895         abs_target_canon = canonicalize_absolute_path(target, abs_target);
 896         if (abs_target_canon == NULL) {
 897                 goto fail;
 898         }
 899
 900         DBG_DEBUG("abs_target_canon=%s\n", abs_target_canon);
 901
 902         in_share = subdir_of(
 903                 connectpath, strlen(connectpath), abs_target_canon, &relative);
 904         if (!in_share) {
 905                 DBG_DEBUG("wide link to %s\n", abs_target_canon);
 906                 status = (unparsed != 0) ? NT_STATUS_OBJECT_PATH_NOT_FOUND
 907                                          : NT_STATUS_OBJECT_NAME_NOT_FOUND;
 908                 goto fail;
 909         }
 910
 911         name_out = talloc_strdup(mem_ctx, relative);
 912         if (name_out == NULL) {
 913                 goto fail;
 914         }
 915
 916         status = NT_STATUS_OK;
 917         *_name_out = name_out;
 918 fail:
 919         TALLOC_FREE(target);
 920         return status;
 921 }
 922
 923 /*
 924  * Split up name_in as sent by the client into a directory pathref fsp
 925  * and a relative smb_filename.
 926  */
 927 static NTSTATUS filename_convert_dirfsp_nosymlink(
 928         TALLOC_CTX *mem_ctx,
 929         connection_struct *conn,
 930         const char *name_in,
 931         uint32_t ucf_flags,
 932         NTTIME twrp,
 933         struct files_struct **_dirfsp,
 934         struct smb_filename **_smb_fname,
 935         struct open_symlink_err **_symlink_err)
 936 {
 937         struct smb_filename *smb_dirname = NULL;
 938         struct smb_filename *smb_fname_rel = NULL;
 939         struct smb_filename *smb_fname = NULL;
 940         const bool posix = (ucf_flags & UCF_POSIX_PATHNAMES);
 941         char *dirname = NULL;
 942         const char *fname_rel = NULL;
 943         const char *streamname = NULL;
 944         char *saved_streamname = NULL;
 945         struct files_struct *base_fsp = NULL;
 946         bool ok;
 947         NTSTATUS status = NT_STATUS_UNSUCCESSFUL;
 948
 949         SMB_ASSERT(!(ucf_flags & UCF_DFS_PATHNAME));
 950
 951         if (is_fake_file_path(name_in)) {
 952                 smb_fname = synthetic_smb_fname_split(mem_ctx, name_in, posix);
 953                 if (smb_fname == NULL) {
 954                         return NT_STATUS_NO_MEMORY;
 955                 }
 956                 smb_fname->st = (SMB_STRUCT_STAT){
 957                         .st_ex_nlink = 1,
 958                         .st_ex_mode = S_IFREG | 0644,
 959                 };
 960                 smb_fname->st.st_ex_btime =
 961                         (struct timespec){0, SAMBA_UTIME_OMIT};
 962                 smb_fname->st.st_ex_atime =
 963                         (struct timespec){0, SAMBA_UTIME_OMIT};
 964                 smb_fname->st.st_ex_mtime =
 965                         (struct timespec){0, SAMBA_UTIME_OMIT};
 966                 smb_fname->st.st_ex_ctime =
 967                         (struct timespec){0, SAMBA_UTIME_OMIT};
 968
 969                 *_dirfsp = conn->cwd_fsp;
 970                 *_smb_fname = smb_fname;
 971                 return NT_STATUS_OK;
 972         }
 973
 974         /*
 975          * Catch an invalid path of "." before we
 976          * call filename_split_lcomp(). We need to
 977          * do this as filename_split_lcomp() will
 978          * use "." for the missing relative component
 979          * when an empty name_in path is sent by
 980          * the client.
 981          */
 982         if (ISDOT(name_in)) {
 983                 status = NT_STATUS_OBJECT_NAME_INVALID;
 984                 goto fail;
 985         }
 986
 987         ok = filename_split_lcomp(
 988                 talloc_tos(),
 989                 name_in,
 990                 posix,
 991                 &dirname,
 992                 &fname_rel,
 993                 &streamname);
 994         if (!ok) {
 995                 status = NT_STATUS_NO_MEMORY;
 996                 goto fail;
 997         }
 998
 999         if ((streamname != NULL) &&
1000             ((conn->fs_capabilities & FILE_NAMED_STREAMS) == 0)) {
1001                 status = NT_STATUS_OBJECT_NAME_INVALID;
1002                 goto fail;
1003         }
1004
1005         if (!posix) {
1006                 bool name_has_wild = ms_has_wild(dirname);
1007                 name_has_wild |= ms_has_wild(fname_rel);
1008                 if (name_has_wild) {
1009                         status = NT_STATUS_OBJECT_NAME_INVALID;
1010                         goto fail;
1011                 }
1012         }
1013
1014         if (dirname[0] == '\0') {
1015                 status = synthetic_pathref(
1016                         mem_ctx,
1017                         conn->cwd_fsp,
1018                         ".",
1019                         NULL,
1020                         NULL,
1021                         0,
1022                         posix ? SMB_FILENAME_POSIX_PATH : 0,
1023                         &smb_dirname);
1024         } else {
1025                 struct open_symlink_err *symlink_err = NULL;
1026
1027                 status = normalize_filename_case(conn, dirname, ucf_flags);
1028                 if (!NT_STATUS_IS_OK(status)) {
1029                         DBG_ERR("normalize_filename_case %s failed: %s\n",
1030                                 dirname,
1031                                 nt_errstr(status));
1032                         goto fail;
1033                 }
1034
1035                 status = openat_pathref_fsp_nosymlink(mem_ctx,
1036                                                       conn,
1037                                                       conn->cwd_fsp,
1038                                                       dirname,
1039                                                       0,
1040                                                       posix,
1041                                                       &smb_dirname,
1042                                                       &symlink_err);
1043
1044                 if (NT_STATUS_EQUAL(status, NT_STATUS_STOPPED_ON_SYMLINK)) {
1045                         size_t name_in_len, dirname_len;
1046
1047                         if (lp_host_msdfs() && lp_msdfs_root(SNUM(conn)) &&
1048                             strnequal(symlink_err->reparse->substitute_name,
1049                                       "msdfs:",
1050                                       6)) {
1051                                 status = NT_STATUS_PATH_NOT_COVERED;
1052                                 goto fail;
1053                         }
1054
1055                         name_in_len = strlen(name_in);
1056                         dirname_len = strlen(dirname);
1057
1058                         SMB_ASSERT(name_in_len >= dirname_len);
1059
1060                         symlink_err->unparsed += (name_in_len - dirname_len);
1061                         *_symlink_err = symlink_err;
1062
1063                         goto fail;
1064                 }
1065         }
1066
1067         if (!NT_STATUS_IS_OK(status)) {
1068                 DBG_DEBUG("opening directory %s failed: %s\n",
1069                           dirname,
1070                           nt_errstr(status));
1071                 TALLOC_FREE(dirname);
1072
1073                 if (!NT_STATUS_EQUAL(status, NT_STATUS_ACCESS_DENIED)) {
1074                         /*
1075                          * Except ACCESS_DENIED, everything else leads
1076                          * to PATH_NOT_FOUND.
1077                          */
1078                         status = NT_STATUS_OBJECT_PATH_NOT_FOUND;
1079                 }
1080
1081                 goto fail;
1082         }
1083
1084         if (!VALID_STAT_OF_DIR(smb_dirname->st)) {
1085                 status = NT_STATUS_OBJECT_PATH_NOT_FOUND;
1086                 goto fail;
1087         }
1088         smb_dirname->fsp->fsp_flags.is_directory = true;
1089
1090         /*
1091          * Only look at bad last component values
1092          * once we know we have a valid directory. That
1093          * way we won't confuse error messages from
1094          * opening the directory path with error
1095          * messages from a bad last component.
1096          */
1097
1098         /* Relative filename can't be empty */
1099         if (fname_rel[0] == '\0') {
1100                 status = NT_STATUS_OBJECT_NAME_INVALID;
1101                 goto fail;
1102         }
1103
1104         /* Relative filename can't be ".." */
1105         if (ISDOTDOT(fname_rel)) {
1106                 status = NT_STATUS_OBJECT_NAME_INVALID;
1107                 goto fail;
1108         }
1109         /* Relative name can only be dot if directory is empty. */
1110         if (ISDOT(fname_rel) && dirname[0] != '\0') {
1111                 status = NT_STATUS_OBJECT_NAME_INVALID;
1112                 goto fail;
1113         }
1114
1115         TALLOC_FREE(dirname);
1116
1117         smb_fname_rel = synthetic_smb_fname(
1118                 mem_ctx,
1119                 fname_rel,
1120                 streamname,
1121                 NULL,
1122                 twrp,
1123                 posix ? SMB_FILENAME_POSIX_PATH : 0);
1124         if (smb_fname_rel == NULL) {
1125                 status = NT_STATUS_NO_MEMORY;
1126                 goto fail;
1127         }
1128
1129         if ((conn->fs_capabilities & FILE_NAMED_STREAMS) &&
1130             is_named_stream(smb_fname_rel)) {
1131                 /*
1132                  * Find the base_fsp first without the stream.
1133                  */
1134                 saved_streamname = smb_fname_rel->stream_name;
1135                 smb_fname_rel->stream_name = NULL;
1136         }
1137
1138         status = normalize_filename_case(
1139                 conn, smb_fname_rel->base_name, ucf_flags);
1140         if (!NT_STATUS_IS_OK(status)) {
1141                 DBG_ERR("normalize_filename_case %s failed: %s\n",
1142                         smb_fname_rel->base_name,
1143                         nt_errstr(status));
1144                 goto fail;
1145         }
1146
1147         status = openat_pathref_fsp_case_insensitive(
1148                 smb_dirname->fsp, smb_fname_rel, ucf_flags);
1149
1150         if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND) &&
1151             VALID_STAT(smb_fname_rel->st) &&
1152             S_ISLNK(smb_fname_rel->st.st_ex_mode)) {
1153
1154                 /*
1155                  * If we're on an MSDFS share, see if this is
1156                  * an MSDFS link.
1157                  */
1158                 if (lp_host_msdfs() &&
1159                     lp_msdfs_root(SNUM(conn)) &&
1160                     is_msdfs_link(smb_dirname->fsp, smb_fname_rel))
1161                 {
1162                         status = NT_STATUS_PATH_NOT_COVERED;
1163                         goto fail;
1164                 }
1165
1166 #if defined(WITH_SMB1SERVER)
1167                 /*
1168                  * In SMB1 posix mode, if this is a symlink,
1169                  * allow access to the name with a NULL smb_fname->fsp.
1170                  */
1171                 if (ucf_flags & UCF_LCOMP_LNK_OK) {
1172                         SMB_ASSERT(smb_fname_rel->fsp == NULL);
1173                         SMB_ASSERT(streamname == NULL);
1174
1175                         smb_fname = full_path_from_dirfsp_atname(
1176                                 mem_ctx,
1177                                 smb_dirname->fsp,
1178                                 smb_fname_rel);
1179                         if (smb_fname == NULL) {
1180                                 status = NT_STATUS_NO_MEMORY;
1181                                 goto fail;
1182                         }
1183                         goto done;
1184                 }
1185 #endif
1186         }
1187
1188         if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND) &&
1189             !VALID_STAT(smb_fname_rel->st)) {
1190
1191                 char *normalized = NULL;
1192
1193                 /*
1194                  * Creating a new file
1195                  */
1196
1197                 status = filename_convert_normalize_new(
1198                         smb_fname_rel,
1199                         conn,
1200                         smb_fname_rel->base_name,
1201                         &normalized);
1202                 if (!NT_STATUS_IS_OK(status)) {
1203                         DBG_DEBUG("filename_convert_normalize_new failed: "
1204                                   "%s\n",
1205                                   nt_errstr(status));
1206                         goto fail;
1207                 }
1208                 if (normalized != NULL) {
1209                         smb_fname_rel->base_name = normalized;
1210                 }
1211
1212                 smb_fname_rel->stream_name = saved_streamname;
1213
1214                 smb_fname = full_path_from_dirfsp_atname(
1215                         mem_ctx, smb_dirname->fsp, smb_fname_rel);
1216                 if (smb_fname == NULL) {
1217                         status = NT_STATUS_NO_MEMORY;
1218                         goto fail;
1219                 }
1220                 goto done;
1221         }
1222
1223         if (NT_STATUS_EQUAL(status, NT_STATUS_NETWORK_OPEN_RESTRICTION)) {
1224                 /* A vetoed file, pretend it's not there  */
1225                 status = NT_STATUS_OBJECT_NAME_NOT_FOUND;
1226         }
1227         if (!NT_STATUS_IS_OK(status)) {
1228                 goto fail;
1229         }
1230
1231         if (saved_streamname == NULL) {
1232                 /* smb_fname must be allocated off mem_ctx. */
1233                 smb_fname = cp_smb_filename(mem_ctx,
1234                                             smb_fname_rel->fsp->fsp_name);
1235                 if (smb_fname == NULL) {
1236                         goto fail;
1237                 }
1238                 status = move_smb_fname_fsp_link(smb_fname, smb_fname_rel);
1239                 if (!NT_STATUS_IS_OK(status)) {
1240                         goto fail;
1241                 }
1242                 goto done;
1243         }
1244
1245         base_fsp = smb_fname_rel->fsp;
1246         smb_fname_fsp_unlink(smb_fname_rel);
1247         SET_STAT_INVALID(smb_fname_rel->st);
1248
1249         smb_fname_rel->stream_name = saved_streamname;
1250
1251         status = open_stream_pathref_fsp(&base_fsp, smb_fname_rel);
1252
1253         if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND) &&
1254             !conn->case_sensitive) {
1255                 char *found = NULL;
1256
1257                 status = get_real_stream_name(
1258                         smb_fname_rel,
1259                         base_fsp,
1260                         smb_fname_rel->stream_name,
1261                         &found);
1262
1263                 if (NT_STATUS_IS_OK(status)) {
1264                         smb_fname_rel->stream_name = found;
1265                         found = NULL;
1266                         status = open_stream_pathref_fsp(
1267                                 &base_fsp, smb_fname_rel);
1268                 }
1269         }
1270
1271         if (NT_STATUS_IS_OK(status)) {
1272                 /* smb_fname must be allocated off mem_ctx. */
1273                 smb_fname = cp_smb_filename(mem_ctx,
1274                                             smb_fname_rel->fsp->fsp_name);
1275                 if (smb_fname == NULL) {
1276                         goto fail;
1277                 }
1278                 status = move_smb_fname_fsp_link(smb_fname, smb_fname_rel);
1279                 if (!NT_STATUS_IS_OK(status)) {
1280                         goto fail;
1281                 }
1282                 goto done;
1283         }
1284
1285         if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
1286                 /*
1287                  * Creating a new stream
1288                  *
1289                  * We should save the already-open base fsp for
1290                  * create_file_unixpath() somehow.
1291                  */
1292                 smb_fname = full_path_from_dirfsp_atname(
1293                         mem_ctx, smb_dirname->fsp, smb_fname_rel);
1294                 if (smb_fname == NULL) {
1295                         status = NT_STATUS_NO_MEMORY;
1296                         goto fail;
1297                 }
1298                 /*
1299                  * When open_stream_pathref_fsp() returns
1300                  * NT_STATUS_OBJECT_NAME_NOT_FOUND, smb_fname_rel->fsp
1301                  * has been set to NULL, so we must free base_fsp separately
1302                  * to prevent fd-leaks when opening a stream that doesn't
1303                  * exist.
1304                  */
1305                 fd_close(base_fsp);
1306                 file_free(NULL, base_fsp);
1307                 base_fsp = NULL;
1308                 goto done;
1309         }
1310
1311         if (!NT_STATUS_IS_OK(status)) {
1312                 goto fail;
1313         }
1314
1315 done:
1316         *_dirfsp = smb_dirname->fsp;
1317         *_smb_fname = smb_fname;
1318
1319         smb_fname_fsp_unlink(smb_fname_rel);
1320         TALLOC_FREE(smb_fname_rel);
1321         return NT_STATUS_OK;
1322
1323 fail:
1324         /*
1325          * If open_stream_pathref_fsp() returns an error, smb_fname_rel->fsp
1326          * has been set to NULL, so we must free base_fsp separately
1327          * to prevent fd-leaks when opening a stream that doesn't
1328          * exist.
1329          */
1330         if (base_fsp != NULL) {
1331                 fd_close(base_fsp);
1332                 file_free(NULL, base_fsp);
1333                 base_fsp = NULL;
1334         }
1335         TALLOC_FREE(dirname);
1336         TALLOC_FREE(smb_dirname);
1337         TALLOC_FREE(smb_fname_rel);
1338         return status;
1339 }
1340
1341 NTSTATUS filename_convert_dirfsp(
1342         TALLOC_CTX *mem_ctx,
1343         connection_struct *conn,
1344         const char *name_in,
1345         uint32_t ucf_flags,
1346         NTTIME twrp,
1347         struct files_struct **_dirfsp,
1348         struct smb_filename **_smb_fname)
1349 {
1350         struct open_symlink_err *symlink_err = NULL;
1351         NTSTATUS status;
1352         char *substitute = NULL;
1353         char *target = NULL;
1354         size_t symlink_redirects = 0;
1355
1356 next:
1357         if (symlink_redirects > 40) {
1358                 return NT_STATUS_OBJECT_PATH_NOT_FOUND;
1359         }
1360
1361         status = filename_convert_dirfsp_nosymlink(mem_ctx,
1362                                                    conn,
1363                                                    name_in,
1364                                                    ucf_flags,
1365                                                    twrp,
1366                                                    _dirfsp,
1367                                                    _smb_fname,
1368                                                    &symlink_err);
1369
1370         if (!NT_STATUS_EQUAL(status, NT_STATUS_STOPPED_ON_SYMLINK)) {
1371                 return status;
1372         }
1373
1374         if (!lp_follow_symlinks(SNUM(conn))) {
1375                 status = (symlink_err->unparsed == 0)
1376                                  ? NT_STATUS_OBJECT_NAME_NOT_FOUND
1377                                  : NT_STATUS_OBJECT_PATH_NOT_FOUND;
1378                 TALLOC_FREE(symlink_err);
1379                 return status;
1380         }
1381
1382         /*
1383          * Right now, SMB2 and SMB1 always traverse symlinks
1384          * within the share. SMB1+POSIX traverses non-terminal
1385          * symlinks within the share.
1386          *
1387          * When we add SMB2+POSIX we need to return
1388          * a NT_STATUS_STOPPED_ON_SYMLINK error here, using the
1389          * symlink target data read below if SMB2+POSIX has
1390          * UCF_POSIX_PATHNAMES set to cause the client to
1391          * resolve all symlinks locally.
1392          */
1393
1394         substitute = symlink_err->reparse->substitute_name;
1395
1396         status = safe_symlink_target_path(mem_ctx,
1397                                           conn->connectpath,
1398                                           name_in,
1399                                           substitute,
1400                                           symlink_err->unparsed,
1401                                           &target);
1402         TALLOC_FREE(symlink_err);
1403         if (!NT_STATUS_IS_OK(status)) {
1404                 return status;
1405         }
1406         name_in = target;
1407
1408         symlink_redirects += 1;
1409
1410         goto next;
1411 }
1412
1413 char *full_path_from_dirfsp_at_basename(TALLOC_CTX *mem_ctx,
1414                                         const struct files_struct *dirfsp,
1415                                         const char *at_base_name)
1416 {
1417         char *path = NULL;
1418
1419         if (dirfsp == dirfsp->conn->cwd_fsp ||
1420             ISDOT(dirfsp->fsp_name->base_name) || at_base_name[0] == '/') {
1421                 path = talloc_strdup(mem_ctx, at_base_name);
1422         } else {
1423                 path = talloc_asprintf(mem_ctx,
1424                                        "%s/%s",
1425                                        dirfsp->fsp_name->base_name,
1426                                        at_base_name);
1427         }
1428
1429         return path;
1430 }
1431
1432 /*
1433  * Build the full path from a dirfsp and dirfsp relative name
1434  */
1435 struct smb_filename *
1436 full_path_from_dirfsp_atname(TALLOC_CTX *mem_ctx,
1437                              const struct files_struct *dirfsp,
1438                              const struct smb_filename *atname)
1439 {
1440         struct smb_filename *fname = NULL;
1441         char *path = NULL;
1442
1443         path = full_path_from_dirfsp_at_basename(mem_ctx,
1444                                                  dirfsp,
1445                                                  atname->base_name);
1446         if (path == NULL) {
1447                 return NULL;
1448         }
1449
1450         fname = synthetic_smb_fname(mem_ctx,
1451                                     path,
1452                                     atname->stream_name,
1453                                     &atname->st,
1454                                     atname->twrp,
1455                                     atname->flags);
1456         TALLOC_FREE(path);
1457         if (fname == NULL) {
1458                 return NULL;
1459         }
1460
1461         return fname;
1462 }