ctdb-scripts: Ignore shellcheck SC2181 warning (use of $?)
[metze/samba/wip.git] / source3 / libsmb / clidfs.c
1 /*
2    Unix SMB/CIFS implementation.
3    client connect/disconnect routines
4    Copyright (C) Andrew Tridgell                  1994-1998
5    Copyright (C) Gerald (Jerry) Carter            2004
6    Copyright (C) Jeremy Allison                   2007-2009
7
8    This program is free software; you can redistribute it and/or modify
9    it under the terms of the GNU General Public License as published by
10    the Free Software Foundation; either version 3 of the License, or
11    (at your option) any later version.
12
13    This program is distributed in the hope that it will be useful,
14    but WITHOUT ANY WARRANTY; without even the implied warranty of
15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16    GNU General Public License for more details.
17
18    You should have received a copy of the GNU General Public License
19    along with this program.  If not, see <http://www.gnu.org/licenses/>.
20 */
21
22 #include "includes.h"
23 #include "libsmb/libsmb.h"
24 #include "libsmb/clirap.h"
25 #include "msdfs.h"
26 #include "trans2.h"
27 #include "libsmb/nmblib.h"
28 #include "../libcli/smb/smbXcli_base.h"
29
30 /********************************************************************
31  Important point.
32
33  DFS paths are *always* of the form \server\share\<pathname> (the \ characters
34  are not C escaped here).
35
36  - but if we're using POSIX paths then <pathname> may contain
37    '/' separators, not '\\' separators. So cope with '\\' or '/'
38    as a separator when looking at the pathname part.... JRA.
39 ********************************************************************/
40
41 /********************************************************************
42  Ensure a connection is encrypted.
43 ********************************************************************/
44
45 NTSTATUS cli_cm_force_encryption_creds(struct cli_state *c,
46                                        struct cli_credentials *creds,
47                                        const char *sharename)
48 {
49         uint16_t major, minor;
50         uint32_t caplow, caphigh;
51         NTSTATUS status;
52
53         if (smbXcli_conn_protocol(c->conn) >= PROTOCOL_SMB2_02) {
54                 status = smb2cli_session_encryption_on(c->smb2.session);
55                 if (NT_STATUS_EQUAL(status,NT_STATUS_NOT_SUPPORTED)) {
56                         d_printf("Encryption required and "
57                                 "server doesn't support "
58                                 "SMB3 encryption - failing connect\n");
59                 } else if (!NT_STATUS_IS_OK(status)) {
60                         d_printf("Encryption required and "
61                                 "setup failed with error %s.\n",
62                                 nt_errstr(status));
63                 }
64                 return status;
65         }
66
67         if (!SERVER_HAS_UNIX_CIFS(c)) {
68                 d_printf("Encryption required and "
69                         "server that doesn't support "
70                         "UNIX extensions - failing connect\n");
71                 return NT_STATUS_NOT_SUPPORTED;
72         }
73
74         status = cli_unix_extensions_version(c, &major, &minor, &caplow,
75                                              &caphigh);
76         if (!NT_STATUS_IS_OK(status)) {
77                 d_printf("Encryption required and "
78                         "can't get UNIX CIFS extensions "
79                         "version from server.\n");
80                 return NT_STATUS_UNKNOWN_REVISION;
81         }
82
83         if (!(caplow & CIFS_UNIX_TRANSPORT_ENCRYPTION_CAP)) {
84                 d_printf("Encryption required and "
85                         "share %s doesn't support "
86                         "encryption.\n", sharename);
87                 return NT_STATUS_UNSUPPORTED_COMPRESSION;
88         }
89
90         status = cli_smb1_setup_encryption(c, creds);
91         if (!NT_STATUS_IS_OK(status)) {
92                 d_printf("Encryption required and "
93                         "setup failed with error %s.\n",
94                         nt_errstr(status));
95                 return status;
96         }
97
98         return NT_STATUS_OK;
99 }
100
101 NTSTATUS cli_cm_force_encryption(struct cli_state *c,
102                         const char *username,
103                         const char *password,
104                         const char *domain,
105                         const char *sharename)
106 {
107         struct cli_credentials *creds = NULL;
108         NTSTATUS status;
109
110         creds = cli_session_creds_init(c,
111                                        username,
112                                        domain,
113                                        NULL, /* default realm */
114                                        password,
115                                        c->use_kerberos,
116                                        c->fallback_after_kerberos,
117                                        c->use_ccache,
118                                        c->pw_nt_hash);
119         if (creds == NULL) {
120                 return NT_STATUS_NO_MEMORY;
121         }
122
123         status = cli_cm_force_encryption_creds(c, creds, sharename);
124         /* gensec currently references the creds so we can't free them here */
125         talloc_unlink(c, creds);
126         return status;
127 }
128
129 /********************************************************************
130  Return a connection to a server.
131 ********************************************************************/
132
133 static NTSTATUS do_connect(TALLOC_CTX *ctx,
134                                         const char *server,
135                                         const char *share,
136                                         const struct user_auth_info *auth_info,
137                                         bool force_encrypt,
138                                         int max_protocol,
139                                         int port,
140                                         int name_type,
141                                         struct cli_state **pcli)
142 {
143         struct cli_state *c = NULL;
144         char *servicename;
145         char *sharename;
146         char *newserver, *newshare;
147         const char *username;
148         const char *password;
149         const char *domain;
150         NTSTATUS status;
151         int flags = 0;
152         int signing_state = get_cmdline_auth_info_signing_state(auth_info);
153         struct cli_credentials *creds = NULL;
154
155         if (force_encrypt) {
156                 signing_state = SMB_SIGNING_REQUIRED;
157         }
158
159         /* make a copy so we don't modify the global string 'service' */
160         servicename = talloc_strdup(ctx,share);
161         if (!servicename) {
162                 return NT_STATUS_NO_MEMORY;
163         }
164         sharename = servicename;
165         if (*sharename == '\\') {
166                 sharename += 2;
167                 if (server == NULL) {
168                         server = sharename;
169                 }
170                 sharename = strchr_m(sharename,'\\');
171                 if (!sharename) {
172                         return NT_STATUS_NO_MEMORY;
173                 }
174                 *sharename = 0;
175                 sharename++;
176         }
177         if (server == NULL) {
178                 return NT_STATUS_INVALID_PARAMETER;
179         }
180
181         if (get_cmdline_auth_info_use_kerberos(auth_info)) {
182                 flags |= CLI_FULL_CONNECTION_USE_KERBEROS;
183         }
184         if (get_cmdline_auth_info_fallback_after_kerberos(auth_info)) {
185                 flags |= CLI_FULL_CONNECTION_FALLBACK_AFTER_KERBEROS;
186         }
187         if (get_cmdline_auth_info_use_ccache(auth_info)) {
188                 flags |= CLI_FULL_CONNECTION_USE_CCACHE;
189         }
190         if (get_cmdline_auth_info_use_pw_nt_hash(auth_info)) {
191                 flags |= CLI_FULL_CONNECTION_USE_NT_HASH;
192         }
193
194         status = cli_connect_nb(
195                 server, NULL, port, name_type, NULL,
196                 signing_state,
197                 flags, &c);
198
199         if (!NT_STATUS_IS_OK(status)) {
200                 d_printf("Connection to %s failed (Error %s)\n",
201                                 server,
202                                 nt_errstr(status));
203                 return status;
204         }
205
206         if (max_protocol == 0) {
207                 max_protocol = PROTOCOL_NT1;
208         }
209         DEBUG(4,(" session request ok\n"));
210
211         status = smbXcli_negprot(c->conn, c->timeout,
212                                  lp_client_min_protocol(),
213                                  max_protocol);
214
215         if (!NT_STATUS_IS_OK(status)) {
216                 d_printf("protocol negotiation failed: %s\n",
217                          nt_errstr(status));
218                 cli_shutdown(c);
219                 return status;
220         }
221
222         if (smbXcli_conn_protocol(c->conn) >= PROTOCOL_SMB2_02) {
223                 /* Ensure we ask for some initial credits. */
224                 smb2cli_conn_set_max_credits(c->conn, DEFAULT_SMB2_MAX_CREDITS);
225         }
226
227         username = get_cmdline_auth_info_username(auth_info);
228         password = get_cmdline_auth_info_password(auth_info);
229         domain = get_cmdline_auth_info_domain(auth_info);
230         if ((domain == NULL) || (domain[0] == '\0')) {
231                 domain = lp_workgroup();
232         }
233
234         creds = get_cmdline_auth_info_creds(auth_info);
235
236         status = cli_session_setup_creds(c, creds);
237         if (!NT_STATUS_IS_OK(status)) {
238                 /* If a password was not supplied then
239                  * try again with a null username. */
240                 if (password[0] || !username[0] ||
241                         get_cmdline_auth_info_use_kerberos(auth_info) ||
242                         !NT_STATUS_IS_OK(status = cli_session_setup_anon(c)))
243                 {
244                         d_printf("session setup failed: %s\n",
245                                  nt_errstr(status));
246                         if (NT_STATUS_EQUAL(status,
247                                             NT_STATUS_MORE_PROCESSING_REQUIRED))
248                                 d_printf("did you forget to run kinit?\n");
249                         cli_shutdown(c);
250                         return status;
251                 }
252                 d_printf("Anonymous login successful\n");
253         }
254
255         if (!NT_STATUS_IS_OK(status)) {
256                 DEBUG(10,("cli_init_creds() failed: %s\n", nt_errstr(status)));
257                 cli_shutdown(c);
258                 return status;
259         }
260
261         DEBUG(4,(" session setup ok\n"));
262
263         /* here's the fun part....to support 'msdfs proxy' shares
264            (on Samba or windows) we have to issues a TRANS_GET_DFS_REFERRAL
265            here before trying to connect to the original share.
266            cli_check_msdfs_proxy() will fail if it is a normal share. */
267
268         if (smbXcli_conn_dfs_supported(c->conn) &&
269                         cli_check_msdfs_proxy(ctx, c, sharename,
270                                 &newserver, &newshare,
271                                 force_encrypt, creds)) {
272                 cli_shutdown(c);
273                 return do_connect(ctx, newserver,
274                                 newshare, auth_info,
275                                 force_encrypt, max_protocol,
276                                 port, name_type, pcli);
277         }
278
279         /* must be a normal share */
280
281         status = cli_tree_connect_creds(c, sharename, "?????", creds);
282         if (!NT_STATUS_IS_OK(status)) {
283                 d_printf("tree connect failed: %s\n", nt_errstr(status));
284                 cli_shutdown(c);
285                 return status;
286         }
287
288         if (force_encrypt) {
289                 status = cli_cm_force_encryption_creds(c,
290                                                        creds,
291                                                        sharename);
292                 if (!NT_STATUS_IS_OK(status)) {
293                         cli_shutdown(c);
294                         return status;
295                 }
296         }
297
298         DEBUG(4,(" tconx ok\n"));
299         *pcli = c;
300         return NT_STATUS_OK;
301 }
302
303 /****************************************************************************
304 ****************************************************************************/
305
306 static void cli_set_mntpoint(struct cli_state *cli, const char *mnt)
307 {
308         TALLOC_CTX *frame = talloc_stackframe();
309         char *name = clean_name(frame, mnt);
310         if (!name) {
311                 TALLOC_FREE(frame);
312                 return;
313         }
314         TALLOC_FREE(cli->dfs_mountpoint);
315         cli->dfs_mountpoint = talloc_strdup(cli, name);
316         TALLOC_FREE(frame);
317 }
318
319 /********************************************************************
320  Add a new connection to the list.
321  referring_cli == NULL means a new initial connection.
322 ********************************************************************/
323
324 static NTSTATUS cli_cm_connect(TALLOC_CTX *ctx,
325                                struct cli_state *referring_cli,
326                                const char *server,
327                                const char *share,
328                                const struct user_auth_info *auth_info,
329                                bool force_encrypt,
330                                int max_protocol,
331                                int port,
332                                int name_type,
333                                struct cli_state **pcli)
334 {
335         struct cli_state *cli;
336         NTSTATUS status;
337
338         status = do_connect(ctx, server, share,
339                                 auth_info,
340                                 force_encrypt, max_protocol,
341                                 port, name_type, &cli);
342
343         if (!NT_STATUS_IS_OK(status)) {
344                 return status;
345         }
346
347         /* Enter into the list. */
348         if (referring_cli) {
349                 DLIST_ADD_END(referring_cli, cli);
350         }
351
352         if (referring_cli && referring_cli->requested_posix_capabilities) {
353                 uint16_t major, minor;
354                 uint32_t caplow, caphigh;
355                 status = cli_unix_extensions_version(cli, &major, &minor,
356                                                      &caplow, &caphigh);
357                 if (NT_STATUS_IS_OK(status)) {
358                         cli_set_unix_extensions_capabilities(cli,
359                                         major, minor,
360                                         caplow, caphigh);
361                 }
362         }
363
364         *pcli = cli;
365         return NT_STATUS_OK;
366 }
367
368 /********************************************************************
369  Return a connection to a server on a particular share.
370 ********************************************************************/
371
372 static struct cli_state *cli_cm_find(struct cli_state *cli,
373                                 const char *server,
374                                 const char *share)
375 {
376         struct cli_state *p;
377
378         if (cli == NULL) {
379                 return NULL;
380         }
381
382         /* Search to the start of the list. */
383         for (p = cli; p; p = DLIST_PREV(p)) {
384                 const char *remote_name =
385                         smbXcli_conn_remote_name(p->conn);
386
387                 if (strequal(server, remote_name) &&
388                                 strequal(share,p->share)) {
389                         return p;
390                 }
391         }
392
393         /* Search to the end of the list. */
394         for (p = cli->next; p; p = p->next) {
395                 const char *remote_name =
396                         smbXcli_conn_remote_name(p->conn);
397
398                 if (strequal(server, remote_name) &&
399                                 strequal(share,p->share)) {
400                         return p;
401                 }
402         }
403
404         return NULL;
405 }
406
407 /****************************************************************************
408  Open a client connection to a \\server\share.
409 ****************************************************************************/
410
411 NTSTATUS cli_cm_open(TALLOC_CTX *ctx,
412                                 struct cli_state *referring_cli,
413                                 const char *server,
414                                 const char *share,
415                                 const struct user_auth_info *auth_info,
416                                 bool force_encrypt,
417                                 int max_protocol,
418                                 int port,
419                                 int name_type,
420                                 struct cli_state **pcli)
421 {
422         /* Try to reuse an existing connection in this list. */
423         struct cli_state *c = cli_cm_find(referring_cli, server, share);
424         NTSTATUS status;
425
426         if (c) {
427                 *pcli = c;
428                 return NT_STATUS_OK;
429         }
430
431         if (auth_info == NULL) {
432                 /* Can't do a new connection
433                  * without auth info. */
434                 d_printf("cli_cm_open() Unable to open connection [\\%s\\%s] "
435                         "without auth info\n",
436                         server, share );
437                 return NT_STATUS_INVALID_PARAMETER;
438         }
439
440         status = cli_cm_connect(ctx,
441                                 referring_cli,
442                                 server,
443                                 share,
444                                 auth_info,
445                                 force_encrypt,
446                                 max_protocol,
447                                 port,
448                                 name_type,
449                                 &c);
450         if (!NT_STATUS_IS_OK(status)) {
451                 return status;
452         }
453         *pcli = c;
454         return NT_STATUS_OK;
455 }
456
457 /****************************************************************************
458 ****************************************************************************/
459
460 void cli_cm_display(struct cli_state *cli)
461 {
462         int i;
463
464         for (i=0; cli; cli = cli->next,i++ ) {
465                 d_printf("%d:\tserver=%s, share=%s\n",
466                         i, smbXcli_conn_remote_name(cli->conn), cli->share);
467         }
468 }
469
470 /****************************************************************************
471 ****************************************************************************/
472
473 /****************************************************************************
474 ****************************************************************************/
475
476 #if 0
477 void cli_cm_set_credentials(struct user_auth_info *auth_info)
478 {
479         SAFE_FREE(cm_creds.username);
480         cm_creds.username = SMB_STRDUP(get_cmdline_auth_info_username(
481                                                auth_info));
482
483         if (get_cmdline_auth_info_got_pass(auth_info)) {
484                 cm_set_password(get_cmdline_auth_info_password(auth_info));
485         }
486
487         cm_creds.use_kerberos = get_cmdline_auth_info_use_kerberos(auth_info);
488         cm_creds.fallback_after_kerberos = false;
489         cm_creds.signing_state = get_cmdline_auth_info_signing_state(auth_info);
490 }
491 #endif
492
493 /**********************************************************************
494  split a dfs path into the server, share name, and extrapath components
495 **********************************************************************/
496
497 static bool split_dfs_path(TALLOC_CTX *ctx,
498                                 const char *nodepath,
499                                 char **pp_server,
500                                 char **pp_share,
501                                 char **pp_extrapath)
502 {
503         char *p, *q;
504         char *path;
505
506         *pp_server = NULL;
507         *pp_share = NULL;
508         *pp_extrapath = NULL;
509
510         path = talloc_strdup(ctx, nodepath);
511         if (!path) {
512                 goto fail;
513         }
514
515         if ( path[0] != '\\' ) {
516                 goto fail;
517         }
518
519         p = strchr_m( path + 1, '\\' );
520         if ( !p ) {
521                 goto fail;
522         }
523
524         *p = '\0';
525         p++;
526
527         /* Look for any extra/deep path */
528         q = strchr_m(p, '\\');
529         if (q != NULL) {
530                 *q = '\0';
531                 q++;
532                 *pp_extrapath = talloc_strdup(ctx, q);
533         } else {
534                 *pp_extrapath = talloc_strdup(ctx, "");
535         }
536         if (*pp_extrapath == NULL) {
537                 goto fail;
538         }
539
540         *pp_share = talloc_strdup(ctx, p);
541         if (*pp_share == NULL) {
542                 goto fail;
543         }
544
545         *pp_server = talloc_strdup(ctx, &path[1]);
546         if (*pp_server == NULL) {
547                 goto fail;
548         }
549
550         TALLOC_FREE(path);
551         return true;
552
553 fail:
554         TALLOC_FREE(*pp_share);
555         TALLOC_FREE(*pp_extrapath);
556         TALLOC_FREE(path);
557         return false;
558 }
559
560 /****************************************************************************
561  Return the original path truncated at the directory component before
562  the first wildcard character. Trust the caller to provide a NULL
563  terminated string
564 ****************************************************************************/
565
566 static char *clean_path(TALLOC_CTX *ctx, const char *path)
567 {
568         size_t len;
569         char *p1, *p2, *p;
570         char *path_out;
571
572         /* No absolute paths. */
573         while (IS_DIRECTORY_SEP(*path)) {
574                 path++;
575         }
576
577         path_out = talloc_strdup(ctx, path);
578         if (!path_out) {
579                 return NULL;
580         }
581
582         p1 = strchr_m(path_out, '*');
583         p2 = strchr_m(path_out, '?');
584
585         if (p1 || p2) {
586                 if (p1 && p2) {
587                         p = MIN(p1,p2);
588                 } else if (!p1) {
589                         p = p2;
590                 } else {
591                         p = p1;
592                 }
593                 *p = '\0';
594
595                 /* Now go back to the start of this component. */
596                 p1 = strrchr_m(path_out, '/');
597                 p2 = strrchr_m(path_out, '\\');
598                 p = MAX(p1,p2);
599                 if (p) {
600                         *p = '\0';
601                 }
602         }
603
604         /* Strip any trailing separator */
605
606         len = strlen(path_out);
607         if ( (len > 0) && IS_DIRECTORY_SEP(path_out[len-1])) {
608                 path_out[len-1] = '\0';
609         }
610
611         return path_out;
612 }
613
614 /****************************************************************************
615 ****************************************************************************/
616
617 static char *cli_dfs_make_full_path(TALLOC_CTX *ctx,
618                                         struct cli_state *cli,
619                                         const char *dir)
620 {
621         char path_sep = '\\';
622
623         /* Ensure the extrapath doesn't start with a separator. */
624         while (IS_DIRECTORY_SEP(*dir)) {
625                 dir++;
626         }
627
628         if (cli->requested_posix_capabilities & CIFS_UNIX_POSIX_PATHNAMES_CAP) {
629                 path_sep = '/';
630         }
631         return talloc_asprintf(ctx, "%c%s%c%s%c%s",
632                         path_sep,
633                         smbXcli_conn_remote_name(cli->conn),
634                         path_sep,
635                         cli->share,
636                         path_sep,
637                         dir);
638 }
639
640 /********************************************************************
641  check for dfs referral
642 ********************************************************************/
643
644 static bool cli_dfs_check_error(struct cli_state *cli, NTSTATUS expected,
645                                 NTSTATUS status)
646 {
647         /* only deal with DS when we negotiated NT_STATUS codes and UNICODE */
648
649         if (!(smbXcli_conn_use_unicode(cli->conn))) {
650                 return false;
651         }
652         if (!(smb1cli_conn_capabilities(cli->conn) & CAP_STATUS32)) {
653                 return false;
654         }
655         if (NT_STATUS_EQUAL(status, expected)) {
656                 return true;
657         }
658         return false;
659 }
660
661 /********************************************************************
662  Get the dfs referral link.
663 ********************************************************************/
664
665 NTSTATUS cli_dfs_get_referral_ex(TALLOC_CTX *ctx,
666                         struct cli_state *cli,
667                         const char *path,
668                         uint16_t max_referral_level,
669                         struct client_dfs_referral **refs,
670                         size_t *num_refs,
671                         size_t *consumed)
672 {
673         unsigned int param_len = 0;
674         uint16_t recv_flags2;
675         uint8_t *param = NULL;
676         uint8_t *rdata = NULL;
677         char *p;
678         char *endp;
679         smb_ucs2_t *path_ucs;
680         char *consumed_path = NULL;
681         uint16_t consumed_ucs;
682         uint16_t num_referrals;
683         struct client_dfs_referral *referrals = NULL;
684         NTSTATUS status;
685         TALLOC_CTX *frame = talloc_stackframe();
686
687         *num_refs = 0;
688         *refs = NULL;
689
690         param = talloc_array(talloc_tos(), uint8_t, 2);
691         if (!param) {
692                 status = NT_STATUS_NO_MEMORY;
693                 goto out;
694         }
695         SSVAL(param, 0, max_referral_level);
696
697         param = trans2_bytes_push_str(param, smbXcli_conn_use_unicode(cli->conn),
698                                       path, strlen(path)+1,
699                                       NULL);
700         if (!param) {
701                 status = NT_STATUS_NO_MEMORY;
702                 goto out;
703         }
704         param_len = talloc_get_size(param);
705         path_ucs = (smb_ucs2_t *)&param[2];
706
707         if (smbXcli_conn_protocol(cli->conn) >= PROTOCOL_SMB2_02) {
708                 DATA_BLOB in_input_buffer;
709                 DATA_BLOB in_output_buffer = data_blob_null;
710                 DATA_BLOB out_input_buffer = data_blob_null;
711                 DATA_BLOB out_output_buffer = data_blob_null;
712
713                 in_input_buffer.data = param;
714                 in_input_buffer.length = param_len;
715
716                 status = smb2cli_ioctl(cli->conn,
717                                        cli->timeout,
718                                        cli->smb2.session,
719                                        cli->smb2.tcon,
720                                        UINT64_MAX, /* in_fid_persistent */
721                                        UINT64_MAX, /* in_fid_volatile */
722                                        FSCTL_DFS_GET_REFERRALS,
723                                        0, /* in_max_input_length */
724                                        &in_input_buffer,
725                                        CLI_BUFFER_SIZE, /* in_max_output_length */
726                                        &in_output_buffer,
727                                        SMB2_IOCTL_FLAG_IS_FSCTL,
728                                        talloc_tos(),
729                                        &out_input_buffer,
730                                        &out_output_buffer);
731                 if (!NT_STATUS_IS_OK(status)) {
732                         goto out;
733                 }
734
735                 if (out_output_buffer.length < 4) {
736                         status = NT_STATUS_INVALID_NETWORK_RESPONSE;
737                         goto out;
738                 }
739
740                 recv_flags2 = FLAGS2_UNICODE_STRINGS;
741                 rdata = out_output_buffer.data;
742                 endp = (char *)rdata + out_output_buffer.length;
743         } else {
744                 unsigned int data_len = 0;
745                 uint16_t setup[1];
746
747                 SSVAL(setup, 0, TRANSACT2_GET_DFS_REFERRAL);
748
749                 status = cli_trans(talloc_tos(), cli, SMBtrans2,
750                                    NULL, 0xffff, 0, 0,
751                                    setup, 1, 0,
752                                    param, param_len, 2,
753                                    NULL, 0, CLI_BUFFER_SIZE,
754                                    &recv_flags2,
755                                    NULL, 0, NULL, /* rsetup */
756                                    NULL, 0, NULL,
757                                    &rdata, 4, &data_len);
758                 if (!NT_STATUS_IS_OK(status)) {
759                         goto out;
760                 }
761
762                 endp = (char *)rdata + data_len;
763         }
764
765         consumed_ucs  = SVAL(rdata, 0);
766         num_referrals = SVAL(rdata, 2);
767
768         /* consumed_ucs is the number of bytes
769          * of the UCS2 path consumed not counting any
770          * terminating null. We need to convert
771          * back to unix charset and count again
772          * to get the number of bytes consumed from
773          * the incoming path. */
774
775         errno = 0;
776         if (pull_string_talloc(talloc_tos(),
777                         NULL,
778                         0,
779                         &consumed_path,
780                         path_ucs,
781                         consumed_ucs,
782                         STR_UNICODE) == 0) {
783                 if (errno != 0) {
784                         status = map_nt_error_from_unix(errno);
785                 } else {
786                         status = NT_STATUS_INVALID_NETWORK_RESPONSE;
787                 }
788                 goto out;
789         }
790         if (consumed_path == NULL) {
791                 status = map_nt_error_from_unix(errno);
792                 goto out;
793         }
794         *consumed = strlen(consumed_path);
795
796         if (num_referrals != 0) {
797                 uint16_t ref_version;
798                 uint16_t ref_size;
799                 int i;
800                 uint16_t node_offset;
801
802                 referrals = talloc_array(ctx, struct client_dfs_referral,
803                                          num_referrals);
804
805                 if (!referrals) {
806                         status = NT_STATUS_NO_MEMORY;
807                         goto out;
808                 }
809                 /* start at the referrals array */
810
811                 p = (char *)rdata+8;
812                 for (i=0; i<num_referrals && p < endp; i++) {
813                         if (p + 18 > endp) {
814                                 goto out;
815                         }
816                         ref_version = SVAL(p, 0);
817                         ref_size    = SVAL(p, 2);
818                         node_offset = SVAL(p, 16);
819
820                         if (ref_version != 3) {
821                                 p += ref_size;
822                                 continue;
823                         }
824
825                         referrals[i].proximity = SVAL(p, 8);
826                         referrals[i].ttl       = SVAL(p, 10);
827
828                         if (p + node_offset > endp) {
829                                 status = NT_STATUS_INVALID_NETWORK_RESPONSE;
830                                 goto out;
831                         }
832                         clistr_pull_talloc(referrals,
833                                            (const char *)rdata,
834                                            recv_flags2,
835                                            &referrals[i].dfspath,
836                                            p+node_offset,
837                                            PTR_DIFF(endp, p+node_offset),
838                                            STR_TERMINATE|STR_UNICODE);
839
840                         if (!referrals[i].dfspath) {
841                                 status = map_nt_error_from_unix(errno);
842                                 goto out;
843                         }
844                         p += ref_size;
845                 }
846                 if (i < num_referrals) {
847                         status = NT_STATUS_INVALID_NETWORK_RESPONSE;
848                         goto out;
849                 }
850         }
851
852         *num_refs = num_referrals;
853         *refs = referrals;
854
855   out:
856
857         TALLOC_FREE(frame);
858         return status;
859 }
860
861 NTSTATUS cli_dfs_get_referral(TALLOC_CTX *ctx,
862                         struct cli_state *cli,
863                         const char *path,
864                         struct client_dfs_referral **refs,
865                         size_t *num_refs,
866                         size_t *consumed)
867 {
868         return cli_dfs_get_referral_ex(ctx,
869                                 cli,
870                                 path,
871                                 3,
872                                 refs, /* Max referral level we want */
873                                 num_refs,
874                                 consumed);
875 }
876
877 /********************************************************************
878 ********************************************************************/
879 struct cli_dfs_path_split {
880         char *server;
881         char *share;
882         char *extrapath;
883 };
884
885 NTSTATUS cli_resolve_path(TALLOC_CTX *ctx,
886                           const char *mountpt,
887                           const struct user_auth_info *dfs_auth_info,
888                           struct cli_state *rootcli,
889                           const char *path,
890                           struct cli_state **targetcli,
891                           char **pp_targetpath)
892 {
893         struct client_dfs_referral *refs = NULL;
894         size_t num_refs = 0;
895         size_t consumed = 0;
896         struct cli_state *cli_ipc = NULL;
897         char *dfs_path = NULL;
898         char *cleanpath = NULL;
899         char *extrapath = NULL;
900         int pathlen;
901         struct cli_state *newcli = NULL;
902         struct cli_state *ccli = NULL;
903         int count = 0;
904         char *newpath = NULL;
905         char *newmount = NULL;
906         char *ppath = NULL;
907         SMB_STRUCT_STAT sbuf;
908         uint32_t attributes;
909         NTSTATUS status;
910         struct smbXcli_tcon *root_tcon = NULL;
911         struct smbXcli_tcon *target_tcon = NULL;
912         struct cli_dfs_path_split *dfs_refs = NULL;
913
914         if ( !rootcli || !path || !targetcli ) {
915                 return NT_STATUS_INVALID_PARAMETER;
916         }
917
918         /* Don't do anything if this is not a DFS root. */
919
920         if (smbXcli_conn_protocol(rootcli->conn) >= PROTOCOL_SMB2_02) {
921                 root_tcon = rootcli->smb2.tcon;
922         } else {
923                 root_tcon = rootcli->smb1.tcon;
924         }
925
926         /*
927          * Avoid more than one leading directory separator
928          */
929         while (IS_DIRECTORY_SEP(path[0]) && IS_DIRECTORY_SEP(path[1])) {
930                 path++;
931         }
932
933         if (!smbXcli_tcon_is_dfs_share(root_tcon)) {
934                 *targetcli = rootcli;
935                 *pp_targetpath = talloc_strdup(ctx, path);
936                 if (!*pp_targetpath) {
937                         return NT_STATUS_NO_MEMORY;
938                 }
939                 return NT_STATUS_OK;
940         }
941
942         *targetcli = NULL;
943
944         /* Send a trans2_query_path_info to check for a referral. */
945
946         cleanpath = clean_path(ctx, path);
947         if (!cleanpath) {
948                 return NT_STATUS_NO_MEMORY;
949         }
950
951         dfs_path = cli_dfs_make_full_path(ctx, rootcli, cleanpath);
952         if (!dfs_path) {
953                 return NT_STATUS_NO_MEMORY;
954         }
955
956         status = cli_qpathinfo_basic( rootcli, dfs_path, &sbuf, &attributes);
957         if (NT_STATUS_IS_OK(status)) {
958                 /* This is an ordinary path, just return it. */
959                 *targetcli = rootcli;
960                 *pp_targetpath = talloc_strdup(ctx, path);
961                 if (!*pp_targetpath) {
962                         return NT_STATUS_NO_MEMORY;
963                 }
964                 goto done;
965         }
966
967         /* Special case where client asked for a path that does not exist */
968
969         if (cli_dfs_check_error(rootcli, NT_STATUS_OBJECT_NAME_NOT_FOUND,
970                                 status)) {
971                 *targetcli = rootcli;
972                 *pp_targetpath = talloc_strdup(ctx, path);
973                 if (!*pp_targetpath) {
974                         return NT_STATUS_NO_MEMORY;
975                 }
976                 goto done;
977         }
978
979         /* We got an error, check for DFS referral. */
980
981         if (!cli_dfs_check_error(rootcli, NT_STATUS_PATH_NOT_COVERED,
982                                  status)) {
983                 return status;
984         }
985
986         /* Check for the referral. */
987
988         status = cli_cm_open(ctx,
989                              rootcli,
990                              smbXcli_conn_remote_name(rootcli->conn),
991                              "IPC$",
992                              dfs_auth_info,
993                              smb1cli_conn_encryption_on(rootcli->conn),
994                              smbXcli_conn_protocol(rootcli->conn),
995                              0,
996                              0x20,
997                              &cli_ipc);
998         if (!NT_STATUS_IS_OK(status)) {
999                 return status;
1000         }
1001
1002         status = cli_dfs_get_referral(ctx, cli_ipc, dfs_path, &refs,
1003                                       &num_refs, &consumed);
1004         if (!NT_STATUS_IS_OK(status)) {
1005                 return status;
1006         }
1007
1008         if (!num_refs || !refs[0].dfspath) {
1009                 return NT_STATUS_NOT_FOUND;
1010         }
1011
1012         /*
1013          * Bug#10123 - DFS referal entries can be provided in a random order,
1014          * so check the connection cache for each item to avoid unnecessary
1015          * reconnections.
1016          */
1017         dfs_refs = talloc_array(ctx, struct cli_dfs_path_split, num_refs);
1018         if (dfs_refs == NULL) {
1019                 return NT_STATUS_NO_MEMORY;
1020         }
1021
1022         for (count = 0; count < num_refs; count++) {
1023                 if (!split_dfs_path(dfs_refs, refs[count].dfspath,
1024                                     &dfs_refs[count].server,
1025                                     &dfs_refs[count].share,
1026                                     &dfs_refs[count].extrapath)) {
1027                         TALLOC_FREE(dfs_refs);
1028                         return NT_STATUS_NOT_FOUND;
1029                 }
1030
1031                 ccli = cli_cm_find(rootcli, dfs_refs[count].server,
1032                                    dfs_refs[count].share);
1033                 if (ccli != NULL) {
1034                         extrapath = dfs_refs[count].extrapath;
1035                         *targetcli = ccli;
1036                         break;
1037                 }
1038         }
1039
1040         /*
1041          * If no cached connection was found, then connect to the first live
1042          * referral server in the list.
1043          */
1044         for (count = 0; (ccli == NULL) && (count < num_refs); count++) {
1045                 /* Connect to the target server & share */
1046                 status = cli_cm_connect(ctx, rootcli,
1047                                 dfs_refs[count].server,
1048                                 dfs_refs[count].share,
1049                                 dfs_auth_info,
1050                                 smb1cli_conn_encryption_on(rootcli->conn),
1051                                 smbXcli_conn_protocol(rootcli->conn),
1052                                 0,
1053                                 0x20,
1054                                 targetcli);
1055                 if (!NT_STATUS_IS_OK(status)) {
1056                         d_printf("Unable to follow dfs referral [\\%s\\%s]\n",
1057                                  dfs_refs[count].server,
1058                                  dfs_refs[count].share);
1059                         continue;
1060                 } else {
1061                         extrapath = dfs_refs[count].extrapath;
1062                         break;
1063                 }
1064         }
1065
1066         /* No available referral server for the connection */
1067         if (*targetcli == NULL) {
1068                 TALLOC_FREE(dfs_refs);
1069                 return status;
1070         }
1071
1072         /* Make sure to recreate the original string including any wildcards. */
1073
1074         dfs_path = cli_dfs_make_full_path(ctx, rootcli, path);
1075         if (!dfs_path) {
1076                 TALLOC_FREE(dfs_refs);
1077                 return NT_STATUS_NO_MEMORY;
1078         }
1079         pathlen = strlen(dfs_path);
1080         consumed = MIN(pathlen, consumed);
1081         *pp_targetpath = talloc_strdup(ctx, &dfs_path[consumed]);
1082         if (!*pp_targetpath) {
1083                 TALLOC_FREE(dfs_refs);
1084                 return NT_STATUS_NO_MEMORY;
1085         }
1086         dfs_path[consumed] = '\0';
1087
1088         /*
1089          * *pp_targetpath is now the unconsumed part of the path.
1090          * dfs_path is now the consumed part of the path
1091          * (in \server\share\path format).
1092          */
1093
1094         if (extrapath && strlen(extrapath) > 0) {
1095                 /* EMC Celerra NAS version 5.6.50 (at least) doesn't appear to */
1096                 /* put the trailing \ on the path, so to be save we put one in if needed */
1097                 if (extrapath[strlen(extrapath)-1] != '\\' && **pp_targetpath != '\\') {
1098                         *pp_targetpath = talloc_asprintf(ctx,
1099                                                   "%s\\%s",
1100                                                   extrapath,
1101                                                   *pp_targetpath);
1102                 } else {
1103                         *pp_targetpath = talloc_asprintf(ctx,
1104                                                   "%s%s",
1105                                                   extrapath,
1106                                                   *pp_targetpath);
1107                 }
1108                 if (!*pp_targetpath) {
1109                         TALLOC_FREE(dfs_refs);
1110                         return NT_STATUS_NO_MEMORY;
1111                 }
1112         }
1113
1114         /* parse out the consumed mount path */
1115         /* trim off the \server\share\ */
1116
1117         ppath = dfs_path;
1118
1119         if (*ppath != '\\') {
1120                 d_printf("cli_resolve_path: "
1121                         "dfs_path (%s) not in correct format.\n",
1122                         dfs_path );
1123                 TALLOC_FREE(dfs_refs);
1124                 return NT_STATUS_NOT_FOUND;
1125         }
1126
1127         ppath++; /* Now pointing at start of server name. */
1128
1129         if ((ppath = strchr_m( dfs_path, '\\' )) == NULL) {
1130                 TALLOC_FREE(dfs_refs);
1131                 return NT_STATUS_NOT_FOUND;
1132         }
1133
1134         ppath++; /* Now pointing at start of share name. */
1135
1136         if ((ppath = strchr_m( ppath+1, '\\' )) == NULL) {
1137                 TALLOC_FREE(dfs_refs);
1138                 return NT_STATUS_NOT_FOUND;
1139         }
1140
1141         ppath++; /* Now pointing at path component. */
1142
1143         newmount = talloc_asprintf(ctx, "%s\\%s", mountpt, ppath );
1144         if (!newmount) {
1145                 TALLOC_FREE(dfs_refs);
1146                 return NT_STATUS_NOT_FOUND;
1147         }
1148
1149         cli_set_mntpoint(*targetcli, newmount);
1150
1151         /* Check for another dfs referral, note that we are not
1152            checking for loops here. */
1153
1154         if (!strequal(*pp_targetpath, "\\") && !strequal(*pp_targetpath, "/")) {
1155                 status = cli_resolve_path(ctx,
1156                                           newmount,
1157                                           dfs_auth_info,
1158                                           *targetcli,
1159                                           *pp_targetpath,
1160                                           &newcli,
1161                                           &newpath);
1162                 if (NT_STATUS_IS_OK(status)) {
1163                         /*
1164                          * When cli_resolve_path returns true here it's always
1165                          * returning the complete path in newpath, so we're done
1166                          * here.
1167                          */
1168                         *targetcli = newcli;
1169                         *pp_targetpath = newpath;
1170                         TALLOC_FREE(dfs_refs);
1171                         return status;
1172                 }
1173         }
1174
1175   done:
1176
1177         if (smbXcli_conn_protocol((*targetcli)->conn) >= PROTOCOL_SMB2_02) {
1178                 target_tcon = (*targetcli)->smb2.tcon;
1179         } else {
1180                 target_tcon = (*targetcli)->smb1.tcon;
1181         }
1182
1183         /* If returning true ensure we return a dfs root full path. */
1184         if (smbXcli_tcon_is_dfs_share(target_tcon)) {
1185                 dfs_path = talloc_strdup(ctx, *pp_targetpath);
1186                 if (!dfs_path) {
1187                         TALLOC_FREE(dfs_refs);
1188                         return NT_STATUS_NO_MEMORY;
1189                 }
1190                 *pp_targetpath = cli_dfs_make_full_path(ctx, *targetcli, dfs_path);
1191                 if (*pp_targetpath == NULL) {
1192                         TALLOC_FREE(dfs_refs);
1193                         return NT_STATUS_NO_MEMORY;
1194                 }
1195         }
1196
1197         TALLOC_FREE(dfs_refs);
1198         return NT_STATUS_OK;
1199 }
1200
1201 /********************************************************************
1202 ********************************************************************/
1203
1204 bool cli_check_msdfs_proxy(TALLOC_CTX *ctx,
1205                                 struct cli_state *cli,
1206                                 const char *sharename,
1207                                 char **pp_newserver,
1208                                 char **pp_newshare,
1209                                 bool force_encrypt,
1210                                 struct cli_credentials *creds)
1211 {
1212         struct client_dfs_referral *refs = NULL;
1213         size_t num_refs = 0;
1214         size_t consumed = 0;
1215         char *fullpath = NULL;
1216         bool res;
1217         struct smbXcli_tcon *orig_tcon = NULL;
1218         char *newextrapath = NULL;
1219         NTSTATUS status;
1220         const char *remote_name;
1221
1222         if (!cli || !sharename) {
1223                 return false;
1224         }
1225
1226         remote_name = smbXcli_conn_remote_name(cli->conn);
1227
1228         /* special case.  never check for a referral on the IPC$ share */
1229
1230         if (strequal(sharename, "IPC$")) {
1231                 return false;
1232         }
1233
1234         /* send a trans2_query_path_info to check for a referral */
1235
1236         fullpath = talloc_asprintf(ctx, "\\%s\\%s", remote_name, sharename);
1237         if (!fullpath) {
1238                 return false;
1239         }
1240
1241         /* Store tcon state. */
1242         if (cli_state_has_tcon(cli)) {
1243                 orig_tcon = cli_state_save_tcon(cli);
1244                 if (orig_tcon == NULL) {
1245                         return false;
1246                 }
1247         }
1248
1249         /* check for the referral */
1250
1251         if (!NT_STATUS_IS_OK(cli_tree_connect(cli, "IPC$", "IPC", NULL))) {
1252                 cli_state_restore_tcon(cli, orig_tcon);
1253                 return false;
1254         }
1255
1256         if (force_encrypt) {
1257                 status = cli_cm_force_encryption_creds(cli, creds, "IPC$");
1258                 if (!NT_STATUS_IS_OK(status)) {
1259                         cli_state_restore_tcon(cli, orig_tcon);
1260                         return false;
1261                 }
1262         }
1263
1264         status = cli_dfs_get_referral(ctx, cli, fullpath, &refs,
1265                                       &num_refs, &consumed);
1266         res = NT_STATUS_IS_OK(status);
1267
1268         status = cli_tdis(cli);
1269
1270         cli_state_restore_tcon(cli, orig_tcon);
1271
1272         if (!NT_STATUS_IS_OK(status)) {
1273                 return false;
1274         }
1275
1276         if (!res || !num_refs) {
1277                 return false;
1278         }
1279
1280         if (!refs[0].dfspath) {
1281                 return false;
1282         }
1283
1284         if (!split_dfs_path(ctx, refs[0].dfspath, pp_newserver,
1285                             pp_newshare, &newextrapath)) {
1286                 return false;
1287         }
1288
1289         /* check that this is not a self-referral */
1290
1291         if (strequal(remote_name, *pp_newserver) &&
1292                         strequal(sharename, *pp_newshare)) {
1293                 return false;
1294         }
1295
1296         return true;
1297 }