e642f169f974eebf442d2adf3b2efd8504c9594a
[ira/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
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
24 /********************************************************************
25  Important point.
26
27  DFS paths are *always* of the form \server\share\<pathname> (the \ characters
28  are not C escaped here).
29
30  - but if we're using POSIX paths then <pathname> may contain
31    '/' separators, not '\\' separators. So cope with '\\' or '/'
32    as a separator when looking at the pathname part.... JRA.
33 ********************************************************************/
34
35 struct client_connection {
36         struct client_connection *prev, *next;
37         struct cli_state *cli;
38         char *mount;
39 };
40
41 static struct cm_cred_struct {
42         char *username;
43         char *password;
44         bool got_pass;
45         bool use_kerberos;
46         bool fallback_after_kerberos;
47         int signing_state;
48 } cm_creds;
49
50 static void cm_set_password(const char *newpass);
51
52 static struct client_connection *connections;
53
54 static bool cli_check_msdfs_proxy(TALLOC_CTX *ctx,
55                                 struct cli_state *cli,
56                                 const char *sharename,
57                                 char **pp_newserver,
58                                 char **pp_newshare,
59                                 bool force_encrypt,
60                                 const char *username,
61                                 const char *password,
62                                 const char *domain);
63
64 /********************************************************************
65  Ensure a connection is encrypted.
66 ********************************************************************/
67
68 NTSTATUS cli_cm_force_encryption(struct cli_state *c,
69                         const char *username,
70                         const char *password,
71                         const char *domain,
72                         const char *sharename)
73 {
74         NTSTATUS status = cli_force_encryption(c,
75                                         username,
76                                         password,
77                                         domain);
78
79         if (NT_STATUS_EQUAL(status,NT_STATUS_NOT_SUPPORTED)) {
80                 d_printf("Encryption required and "
81                         "server that doesn't support "
82                         "UNIX extensions - failing connect\n");
83         } else if (NT_STATUS_EQUAL(status,NT_STATUS_UNKNOWN_REVISION)) {
84                 d_printf("Encryption required and "
85                         "can't get UNIX CIFS extensions "
86                         "version from server.\n");
87         } else if (NT_STATUS_EQUAL(status,NT_STATUS_UNSUPPORTED_COMPRESSION)) {
88                 d_printf("Encryption required and "
89                         "share %s doesn't support "
90                         "encryption.\n", sharename);
91         } else if (!NT_STATUS_IS_OK(status)) {
92                 d_printf("Encryption required and "
93                         "setup failed with error %s.\n",
94                         nt_errstr(status));
95         }
96
97         return status;
98 }
99         
100 /********************************************************************
101  Return a connection to a server.
102 ********************************************************************/
103
104 static struct cli_state *do_connect(TALLOC_CTX *ctx,
105                                         const char *server,
106                                         const char *share,
107                                         bool show_sessetup,
108                                         bool force_encrypt,
109                                         int max_protocol,
110                                         int port,
111                                         int name_type)
112 {
113         struct cli_state *c = NULL;
114         struct nmb_name called, calling;
115         const char *server_n;
116         struct sockaddr_storage ss;
117         char *servicename;
118         char *sharename;
119         char *newserver, *newshare;
120         const char *username;
121         const char *password;
122         NTSTATUS status;
123
124         /* make a copy so we don't modify the global string 'service' */
125         servicename = talloc_strdup(ctx,share);
126         if (!servicename) {
127                 return NULL;
128         }
129         sharename = servicename;
130         if (*sharename == '\\') {
131                 sharename += 2;
132                 if (server == NULL) {
133                         server = sharename;
134                 }
135                 sharename = strchr_m(sharename,'\\');
136                 if (!sharename) {
137                         return NULL;
138                 }
139                 *sharename = 0;
140                 sharename++;
141         }
142
143         server_n = server;
144
145         zero_sockaddr(&ss);
146
147         make_nmb_name(&calling, global_myname(), 0x0);
148         make_nmb_name(&called , server, name_type);
149
150  again:
151         zero_sockaddr(&ss);
152
153         /* have to open a new connection */
154         if (!(c=cli_initialise())) {
155                 d_printf("Connection to %s failed\n", server_n);
156                 if (c) {
157                         cli_shutdown(c);
158                 }
159                 return NULL;
160         }
161         if (port) {
162                 cli_set_port(c, port);
163         }
164
165         status = cli_connect(c, server_n, &ss);
166         if (!NT_STATUS_IS_OK(status)) {
167                 d_printf("Connection to %s failed (Error %s)\n",
168                                 server_n,
169                                 nt_errstr(status));
170                 cli_shutdown(c);
171                 return NULL;
172         }
173
174         if (max_protocol == 0) {
175                 max_protocol = PROTOCOL_NT1;
176         }
177         c->protocol = max_protocol;
178         c->use_kerberos = cm_creds.use_kerberos;
179         c->fallback_after_kerberos = cm_creds.fallback_after_kerberos;
180         cli_setup_signing_state(c, cm_creds.signing_state);
181
182         if (!cli_session_request(c, &calling, &called)) {
183                 char *p;
184                 d_printf("session request to %s failed (%s)\n",
185                          called.name, cli_errstr(c));
186                 cli_shutdown(c);
187                 c = NULL;
188                 if ((p=strchr_m(called.name, '.'))) {
189                         *p = 0;
190                         goto again;
191                 }
192                 if (strcmp(called.name, "*SMBSERVER")) {
193                         make_nmb_name(&called , "*SMBSERVER", 0x20);
194                         goto again;
195                 }
196                 return NULL;
197         }
198
199         DEBUG(4,(" session request ok\n"));
200
201         status = cli_negprot(c);
202
203         if (!NT_STATUS_IS_OK(status)) {
204                 d_printf("protocol negotiation failed: %s\n",
205                          nt_errstr(status));
206                 cli_shutdown(c);
207                 return NULL;
208         }
209
210         if (!cm_creds.got_pass && !cm_creds.use_kerberos) {
211                 char *label = NULL;
212                 char *pass;
213                 label = talloc_asprintf(ctx, "Enter %s's password: ",
214                         cm_creds.username);
215                 pass = getpass(label);
216                 if (pass) {
217                         cm_set_password(pass);
218                 }
219                 TALLOC_FREE(label);
220         }
221
222         username = cm_creds.username ? cm_creds.username : "";
223         password = cm_creds.password ? cm_creds.password : "";
224
225         if (!NT_STATUS_IS_OK(cli_session_setup(c, username,
226                                                password, strlen(password),
227                                                password, strlen(password),
228                                                lp_workgroup()))) {
229                 /* If a password was not supplied then
230                  * try again with a null username. */
231                 if (password[0] || !username[0] || cm_creds.use_kerberos ||
232                     !NT_STATUS_IS_OK(cli_session_setup(c, "",
233                                                 "", 0,
234                                                 "", 0,
235                                                lp_workgroup()))) {
236                         d_printf("session setup failed: %s\n", cli_errstr(c));
237                         if (NT_STATUS_V(cli_nt_error(c)) ==
238                             NT_STATUS_V(NT_STATUS_MORE_PROCESSING_REQUIRED))
239                                 d_printf("did you forget to run kinit?\n");
240                         cli_shutdown(c);
241                         return NULL;
242                 }
243                 d_printf("Anonymous login successful\n");
244         }
245
246         if ( show_sessetup ) {
247                 if (*c->server_domain) {
248                         DEBUG(0,("Domain=[%s] OS=[%s] Server=[%s]\n",
249                                 c->server_domain,c->server_os,c->server_type));
250                 } else if (*c->server_os || *c->server_type) {
251                         DEBUG(0,("OS=[%s] Server=[%s]\n",
252                                  c->server_os,c->server_type));
253                 }
254         }
255         DEBUG(4,(" session setup ok\n"));
256
257         /* here's the fun part....to support 'msdfs proxy' shares
258            (on Samba or windows) we have to issues a TRANS_GET_DFS_REFERRAL
259            here before trying to connect to the original share.
260            check_dfs_proxy() will fail if it is a normal share. */
261
262         if ((c->capabilities & CAP_DFS) &&
263                         cli_check_msdfs_proxy(ctx, c, sharename,
264                                 &newserver, &newshare,
265                                 force_encrypt,
266                                 username,
267                                 password,
268                                 lp_workgroup())) {
269                 cli_shutdown(c);
270                 return do_connect(ctx, newserver,
271                                 newshare, false,
272                                 force_encrypt, max_protocol,
273                                 port, name_type);
274         }
275
276         /* must be a normal share */
277
278         status = cli_tcon_andx(c, sharename, "?????",
279                                password, strlen(password)+1);
280         if (!NT_STATUS_IS_OK(status)) {
281                 d_printf("tree connect failed: %s\n", nt_errstr(status));
282                 cli_shutdown(c);
283                 return NULL;
284         }
285
286         if (force_encrypt) {
287                 status = cli_cm_force_encryption(c,
288                                         username,
289                                         password,
290                                         lp_workgroup(),
291                                         sharename);
292                 if (!NT_STATUS_IS_OK(status)) {
293                         cli_shutdown(c);
294                         return NULL;
295                 }
296         }
297
298         DEBUG(4,(" tconx ok\n"));
299         return c;
300 }
301
302 /****************************************************************************
303 ****************************************************************************/
304
305 static void cli_cm_set_mntpoint(struct cli_state *c, const char *mnt)
306 {
307         struct client_connection *p;
308         int i;
309
310         for (p=connections,i=0; p; p=p->next,i++) {
311                 if (strequal(p->cli->desthost, c->desthost) &&
312                                 strequal(p->cli->share, c->share)) {
313                         break;
314                 }
315         }
316
317         if (p) {
318                 char *name = clean_name(NULL, mnt);
319                 if (!name) {
320                         return;
321                 }
322                 TALLOC_FREE(p->mount);
323                 p->mount = talloc_strdup(p, name);
324                 TALLOC_FREE(name);
325         }
326 }
327
328 /****************************************************************************
329 ****************************************************************************/
330
331 const char *cli_cm_get_mntpoint(struct cli_state *c)
332 {
333         struct client_connection *p;
334         int i;
335
336         for (p=connections,i=0; p; p=p->next,i++) {
337                 if (strequal(p->cli->desthost, c->desthost) &&
338                                 strequal(p->cli->share, c->share)) {
339                         break;
340                 }
341         }
342
343         if (p) {
344                 return p->mount;
345         }
346         return NULL;
347 }
348
349 /********************************************************************
350  Add a new connection to the list
351 ********************************************************************/
352
353 static struct cli_state *cli_cm_connect(TALLOC_CTX *ctx,
354                                         struct cli_state *referring_cli,
355                                         const char *server,
356                                         const char *share,
357                                         bool show_hdr,
358                                         bool force_encrypt,
359                                         int max_protocol,
360                                         int port,
361                                         int name_type)
362 {
363         struct client_connection *node;
364
365         /* NB This must be the null context here... JRA. */
366         node = TALLOC_ZERO_ARRAY(NULL, struct client_connection, 1);
367         if (!node) {
368                 return NULL;
369         }
370
371         node->cli = do_connect(ctx, server, share,
372                                 show_hdr, force_encrypt, max_protocol,
373                                 port, name_type);
374
375         if ( !node->cli ) {
376                 TALLOC_FREE( node );
377                 return NULL;
378         }
379
380         DLIST_ADD( connections, node );
381
382         cli_cm_set_mntpoint(node->cli, "");
383
384         if (referring_cli && referring_cli->posix_capabilities) {
385                 uint16 major, minor;
386                 uint32 caplow, caphigh;
387                 if (cli_unix_extensions_version(node->cli, &major,
388                                         &minor, &caplow, &caphigh)) {
389                         cli_set_unix_extensions_capabilities(node->cli,
390                                         major, minor,
391                                         caplow, caphigh);
392                 }
393         }
394
395         return node->cli;
396 }
397
398 /********************************************************************
399  Return a connection to a server.
400 ********************************************************************/
401
402 static struct cli_state *cli_cm_find(const char *server, const char *share)
403 {
404         struct client_connection *p;
405
406         for (p=connections; p; p=p->next) {
407                 if ( strequal(server, p->cli->desthost) &&
408                                 strequal(share,p->cli->share)) {
409                         return p->cli;
410                 }
411         }
412
413         return NULL;
414 }
415
416 /****************************************************************************
417  Open a client connection to a \\server\share.  Set's the current *cli
418  global variable as a side-effect (but only if the connection is successful).
419 ****************************************************************************/
420
421 struct cli_state *cli_cm_open(TALLOC_CTX *ctx,
422                                 struct cli_state *referring_cli,
423                                 const char *server,
424                                 const char *share,
425                                 bool show_hdr,
426                                 bool force_encrypt,
427                                 int max_protocol,
428                                 int port,
429                                 int name_type)
430 {
431         struct cli_state *c;
432
433         /* try to reuse an existing connection */
434
435         c = cli_cm_find(server, share);
436         if (!c) {
437                 c = cli_cm_connect(ctx, referring_cli,
438                                 server, share, show_hdr, force_encrypt,
439                                 max_protocol, port, name_type);
440         }
441
442         return c;
443 }
444
445 /****************************************************************************
446 ****************************************************************************/
447
448 void cli_cm_shutdown(void)
449 {
450         struct client_connection *p, *x;
451
452         for (p=connections; p;) {
453                 cli_shutdown(p->cli);
454                 x = p;
455                 p = p->next;
456
457                 TALLOC_FREE(x);
458         }
459
460         connections = NULL;
461         return;
462 }
463
464 /****************************************************************************
465 ****************************************************************************/
466
467 void cli_cm_display(void)
468 {
469         struct client_connection *p;
470         int i;
471
472         for ( p=connections,i=0; p; p=p->next,i++ ) {
473                 d_printf("%d:\tserver=%s, share=%s\n",
474                         i, p->cli->desthost, p->cli->share );
475         }
476 }
477
478 /****************************************************************************
479 ****************************************************************************/
480
481 static void cm_set_password(const char *newpass)
482 {
483         SAFE_FREE(cm_creds.password);
484         cm_creds.password = SMB_STRDUP(newpass);
485         if (cm_creds.password) {
486                 cm_creds.got_pass = true;
487         }
488 }
489
490 /****************************************************************************
491 ****************************************************************************/
492
493 void cli_cm_set_credentials(struct user_auth_info *auth_info)
494 {
495         SAFE_FREE(cm_creds.username);
496         cm_creds.username = SMB_STRDUP(get_cmdline_auth_info_username(
497                                                auth_info));
498
499         if (get_cmdline_auth_info_got_pass(auth_info)) {
500                 cm_set_password(get_cmdline_auth_info_password(auth_info));
501         }
502
503         cm_creds.use_kerberos = get_cmdline_auth_info_use_kerberos(auth_info);
504         cm_creds.fallback_after_kerberos = false;
505         cm_creds.signing_state = get_cmdline_auth_info_signing_state(auth_info);
506 }
507
508 /****************************************************************************
509 ****************************************************************************/
510
511 void cli_cm_set_signing_state(int state)
512 {
513         cm_creds.signing_state = state;
514 }
515
516 /****************************************************************************
517 ****************************************************************************/
518
519 void cli_cm_set_username(const char *username)
520 {
521         SAFE_FREE(cm_creds.username);
522         cm_creds.username = SMB_STRDUP(username);
523 }
524
525 /****************************************************************************
526 ****************************************************************************/
527
528 void cli_cm_set_password(const char *newpass)
529 {
530         SAFE_FREE(cm_creds.password);
531         cm_creds.password = SMB_STRDUP(newpass);
532         if (cm_creds.password) {
533                 cm_creds.got_pass = true;
534         }
535 }
536
537 /****************************************************************************
538 ****************************************************************************/
539
540 void cli_cm_set_use_kerberos(void)
541 {
542         cm_creds.use_kerberos = true;
543 }
544
545 /****************************************************************************
546 ****************************************************************************/
547
548 void cli_cm_set_fallback_after_kerberos(void)
549 {
550         cm_creds.fallback_after_kerberos = true;
551 }
552
553 /**********************************************************************
554  split a dfs path into the server, share name, and extrapath components
555 **********************************************************************/
556
557 static void split_dfs_path(TALLOC_CTX *ctx,
558                                 const char *nodepath,
559                                 char **pp_server,
560                                 char **pp_share,
561                                 char **pp_extrapath)
562 {
563         char *p, *q;
564         char *path;
565
566         *pp_server = NULL;
567         *pp_share = NULL;
568         *pp_extrapath = NULL;
569
570         path = talloc_strdup(ctx, nodepath);
571         if (!path) {
572                 return;
573         }
574
575         if ( path[0] != '\\' ) {
576                 return;
577         }
578
579         p = strchr_m( path + 1, '\\' );
580         if ( !p ) {
581                 return;
582         }
583
584         *p = '\0';
585         p++;
586
587         /* Look for any extra/deep path */
588         q = strchr_m(p, '\\');
589         if (q != NULL) {
590                 *q = '\0';
591                 q++;
592                 *pp_extrapath = talloc_strdup(ctx, q);
593         } else {
594                 *pp_extrapath = talloc_strdup(ctx, "");
595         }
596
597         *pp_share = talloc_strdup(ctx, p);
598         *pp_server = talloc_strdup(ctx, &path[1]);
599 }
600
601 /****************************************************************************
602  Return the original path truncated at the directory component before
603  the first wildcard character. Trust the caller to provide a NULL
604  terminated string
605 ****************************************************************************/
606
607 static char *clean_path(TALLOC_CTX *ctx, const char *path)
608 {
609         size_t len;
610         char *p1, *p2, *p;
611         char *path_out;
612
613         /* No absolute paths. */
614         while (IS_DIRECTORY_SEP(*path)) {
615                 path++;
616         }
617
618         path_out = talloc_strdup(ctx, path);
619         if (!path_out) {
620                 return NULL;
621         }
622
623         p1 = strchr_m(path_out, '*');
624         p2 = strchr_m(path_out, '?');
625
626         if (p1 || p2) {
627                 if (p1 && p2) {
628                         p = MIN(p1,p2);
629                 } else if (!p1) {
630                         p = p2;
631                 } else {
632                         p = p1;
633                 }
634                 *p = '\0';
635
636                 /* Now go back to the start of this component. */
637                 p1 = strrchr_m(path_out, '/');
638                 p2 = strrchr_m(path_out, '\\');
639                 p = MAX(p1,p2);
640                 if (p) {
641                         *p = '\0';
642                 }
643         }
644
645         /* Strip any trailing separator */
646
647         len = strlen(path_out);
648         if ( (len > 0) && IS_DIRECTORY_SEP(path_out[len-1])) {
649                 path_out[len-1] = '\0';
650         }
651
652         return path_out;
653 }
654
655 /****************************************************************************
656 ****************************************************************************/
657
658 static char *cli_dfs_make_full_path(TALLOC_CTX *ctx,
659                                         struct cli_state *cli,
660                                         const char *dir)
661 {
662         /* Ensure the extrapath doesn't start with a separator. */
663         while (IS_DIRECTORY_SEP(*dir)) {
664                 dir++;
665         }
666
667         return talloc_asprintf(ctx, "\\%s\\%s\\%s",
668                         cli->desthost, cli->share, dir);
669 }
670
671 /********************************************************************
672  check for dfs referral
673 ********************************************************************/
674
675 static bool cli_dfs_check_error( struct cli_state *cli, NTSTATUS status )
676 {
677         uint32 flgs2 = SVAL(cli->inbuf,smb_flg2);
678
679         /* only deal with DS when we negotiated NT_STATUS codes and UNICODE */
680
681         if (!((flgs2&FLAGS2_32_BIT_ERROR_CODES) &&
682                                 (flgs2&FLAGS2_UNICODE_STRINGS)))
683                 return false;
684
685         if (NT_STATUS_EQUAL(status, NT_STATUS(IVAL(cli->inbuf,smb_rcls))))
686                 return true;
687
688         return false;
689 }
690
691 /********************************************************************
692  Get the dfs referral link.
693 ********************************************************************/
694
695 bool cli_dfs_get_referral(TALLOC_CTX *ctx,
696                         struct cli_state *cli,
697                         const char *path,
698                         CLIENT_DFS_REFERRAL**refs,
699                         size_t *num_refs,
700                         uint16 *consumed)
701 {
702         unsigned int data_len = 0;
703         unsigned int param_len = 0;
704         uint16 setup = TRANSACT2_GET_DFS_REFERRAL;
705         char *param;
706         char *rparam=NULL, *rdata=NULL;
707         char *p;
708         char *endp;
709         size_t pathlen = 2*(strlen(path)+1);
710         uint16 num_referrals;
711         CLIENT_DFS_REFERRAL *referrals = NULL;
712         bool ret = false;
713
714         *num_refs = 0;
715         *refs = NULL;
716
717         param = SMB_MALLOC_ARRAY(char, 2+pathlen+2);
718         if (!param) {
719                 return false;
720         }
721         SSVAL(param, 0, 0x03);  /* max referral level */
722         p = &param[2];
723
724         p += clistr_push(cli, p, path, pathlen, STR_TERMINATE);
725         param_len = PTR_DIFF(p, param);
726
727         if (!cli_send_trans(cli, SMBtrans2,
728                         NULL,                        /* name */
729                         -1, 0,                          /* fid, flags */
730                         &setup, 1, 0,                   /* setup, length, max */
731                         param, param_len, 2,            /* param, length, max */
732                         NULL, 0, cli->max_xmit /* data, length, max */
733                         )) {
734                 SAFE_FREE(param);
735                 return false;
736         }
737
738         SAFE_FREE(param);
739
740         if (!cli_receive_trans(cli, SMBtrans2,
741                 &rparam, &param_len,
742                 &rdata, &data_len)) {
743                         return false;
744         }
745
746         if (data_len < 4) {
747                 goto out;
748         }
749
750         endp = rdata + data_len;
751
752         *consumed     = SVAL(rdata, 0);
753         num_referrals = SVAL(rdata, 2);
754
755         if (num_referrals != 0) {
756                 uint16 ref_version;
757                 uint16 ref_size;
758                 int i;
759                 uint16 node_offset;
760
761                 referrals = TALLOC_ARRAY(ctx, CLIENT_DFS_REFERRAL,
762                                 num_referrals);
763
764                 if (!referrals) {
765                         goto out;
766                 }
767                 /* start at the referrals array */
768
769                 p = rdata+8;
770                 for (i=0; i<num_referrals && p < endp; i++) {
771                         if (p + 18 > endp) {
772                                 goto out;
773                         }
774                         ref_version = SVAL(p, 0);
775                         ref_size    = SVAL(p, 2);
776                         node_offset = SVAL(p, 16);
777
778                         if (ref_version != 3) {
779                                 p += ref_size;
780                                 continue;
781                         }
782
783                         referrals[i].proximity = SVAL(p, 8);
784                         referrals[i].ttl       = SVAL(p, 10);
785
786                         if (p + node_offset > endp) {
787                                 goto out;
788                         }
789                         clistr_pull_talloc(ctx, cli->inbuf,
790                                            &referrals[i].dfspath,
791                                            p+node_offset, -1,
792                                            STR_TERMINATE|STR_UNICODE);
793
794                         if (!referrals[i].dfspath) {
795                                 goto out;
796                         }
797                         p += ref_size;
798                 }
799                 if (i < num_referrals) {
800                         goto out;
801                 }
802         }
803
804         ret = true;
805
806         *num_refs = num_referrals;
807         *refs = referrals;
808
809   out:
810
811         SAFE_FREE(rdata);
812         SAFE_FREE(rparam);
813         return ret;
814 }
815
816 /********************************************************************
817 ********************************************************************/
818
819 bool cli_resolve_path(TALLOC_CTX *ctx,
820                         const char *mountpt,
821                         struct cli_state *rootcli,
822                         const char *path,
823                         struct cli_state **targetcli,
824                         char **pp_targetpath)
825 {
826         CLIENT_DFS_REFERRAL *refs = NULL;
827         size_t num_refs = 0;
828         uint16 consumed;
829         struct cli_state *cli_ipc = NULL;
830         char *dfs_path = NULL;
831         char *cleanpath = NULL;
832         char *extrapath = NULL;
833         int pathlen;
834         char *server = NULL;
835         char *share = NULL;
836         struct cli_state *newcli = NULL;
837         char *newpath = NULL;
838         char *newmount = NULL;
839         char *ppath = NULL;
840         SMB_STRUCT_STAT sbuf;
841         uint32 attributes;
842
843         if ( !rootcli || !path || !targetcli ) {
844                 return false;
845         }
846
847         /* Don't do anything if this is not a DFS root. */
848
849         if ( !rootcli->dfsroot) {
850                 *targetcli = rootcli;
851                 *pp_targetpath = talloc_strdup(ctx, path);
852                 if (!*pp_targetpath) {
853                         return false;
854                 }
855                 return true;
856         }
857
858         *targetcli = NULL;
859
860         /* Send a trans2_query_path_info to check for a referral. */
861
862         cleanpath = clean_path(ctx, path);
863         if (!cleanpath) {
864                 return false;
865         }
866
867         dfs_path = cli_dfs_make_full_path(ctx, rootcli, cleanpath);
868         if (!dfs_path) {
869                 return false;
870         }
871
872         if (cli_qpathinfo_basic( rootcli, dfs_path, &sbuf, &attributes)) {
873                 /* This is an ordinary path, just return it. */
874                 *targetcli = rootcli;
875                 *pp_targetpath = talloc_strdup(ctx, path);
876                 if (!*pp_targetpath) {
877                         return false;
878                 }
879                 goto done;
880         }
881
882         /* Special case where client asked for a path that does not exist */
883
884         if (cli_dfs_check_error(rootcli, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
885                 *targetcli = rootcli;
886                 *pp_targetpath = talloc_strdup(ctx, path);
887                 if (!*pp_targetpath) {
888                         return false;
889                 }
890                 goto done;
891         }
892
893         /* We got an error, check for DFS referral. */
894
895         if (!cli_dfs_check_error(rootcli, NT_STATUS_PATH_NOT_COVERED)) {
896                 return false;
897         }
898
899         /* Check for the referral. */
900
901         if (!(cli_ipc = cli_cm_open(ctx, rootcli,
902                                         rootcli->desthost,
903                                         "IPC$", false,
904                                         (rootcli->trans_enc_state != NULL),
905                                         rootcli->protocol,
906                                         0,
907                                         0x20))) {
908                 return false;
909         }
910
911         if (!cli_dfs_get_referral(ctx, cli_ipc, dfs_path, &refs,
912                         &num_refs, &consumed) || !num_refs) {
913                 return false;
914         }
915
916         /* Just store the first referral for now. */
917
918         if (!refs[0].dfspath) {
919                 return false;
920         }
921         split_dfs_path(ctx, refs[0].dfspath, &server, &share, &extrapath );
922
923         if (!server || !share) {
924                 return false;
925         }
926
927         /* Make sure to recreate the original string including any wildcards. */
928
929         dfs_path = cli_dfs_make_full_path(ctx, rootcli, path);
930         if (!dfs_path) {
931                 return false;
932         }
933         pathlen = strlen(dfs_path)*2;
934         consumed = MIN(pathlen, consumed);
935         *pp_targetpath = talloc_strdup(ctx, &dfs_path[consumed/2]);
936         if (!*pp_targetpath) {
937                 return false;
938         }
939         dfs_path[consumed/2] = '\0';
940
941         /*
942          * *pp_targetpath is now the unconsumed part of the path.
943          * dfs_path is now the consumed part of the path
944          * (in \server\share\path format).
945          */
946
947         /* Open the connection to the target server & share */
948         if ((*targetcli = cli_cm_open(ctx, rootcli,
949                                         server,
950                                         share,
951                                         false,
952                                         (rootcli->trans_enc_state != NULL),
953                                         rootcli->protocol,
954                                         0,
955                                         0x20)) == NULL) {
956                 d_printf("Unable to follow dfs referral [\\%s\\%s]\n",
957                         server, share );
958                 return false;
959         }
960
961         if (extrapath && strlen(extrapath) > 0) {
962                 *pp_targetpath = talloc_asprintf(ctx,
963                                                 "%s%s",
964                                                 extrapath,
965                                                 *pp_targetpath);
966                 if (!*pp_targetpath) {
967                         return false;
968                 }
969         }
970
971         /* parse out the consumed mount path */
972         /* trim off the \server\share\ */
973
974         ppath = dfs_path;
975
976         if (*ppath != '\\') {
977                 d_printf("cli_resolve_path: "
978                         "dfs_path (%s) not in correct format.\n",
979                         dfs_path );
980                 return false;
981         }
982
983         ppath++; /* Now pointing at start of server name. */
984
985         if ((ppath = strchr_m( dfs_path, '\\' )) == NULL) {
986                 return false;
987         }
988
989         ppath++; /* Now pointing at start of share name. */
990
991         if ((ppath = strchr_m( ppath+1, '\\' )) == NULL) {
992                 return false;
993         }
994
995         ppath++; /* Now pointing at path component. */
996
997         newmount = talloc_asprintf(ctx, "%s\\%s", mountpt, ppath );
998         if (!newmount) {
999                 return false;
1000         }
1001
1002         cli_cm_set_mntpoint(*targetcli, newmount);
1003
1004         /* Check for another dfs referral, note that we are not
1005            checking for loops here. */
1006
1007         if (!strequal(*pp_targetpath, "\\") && !strequal(*pp_targetpath, "/")) {
1008                 if (cli_resolve_path(ctx,
1009                                         newmount,
1010                                         *targetcli,
1011                                         *pp_targetpath,
1012                                         &newcli,
1013                                         &newpath)) {
1014                         /*
1015                          * When cli_resolve_path returns true here it's always
1016                          * returning the complete path in newpath, so we're done
1017                          * here.
1018                          */
1019                         *targetcli = newcli;
1020                         *pp_targetpath = newpath;
1021                         return true;
1022                 }
1023         }
1024
1025   done:
1026
1027         /* If returning true ensure we return a dfs root full path. */
1028         if ((*targetcli)->dfsroot) {
1029                 dfs_path = talloc_strdup(ctx, *pp_targetpath);
1030                 if (!dfs_path) {
1031                         return false;
1032                 }
1033                 *pp_targetpath = cli_dfs_make_full_path(ctx, *targetcli, dfs_path);
1034         }
1035
1036         return true;
1037 }
1038
1039 /********************************************************************
1040 ********************************************************************/
1041
1042 static bool cli_check_msdfs_proxy(TALLOC_CTX *ctx,
1043                                 struct cli_state *cli,
1044                                 const char *sharename,
1045                                 char **pp_newserver,
1046                                 char **pp_newshare,
1047                                 bool force_encrypt,
1048                                 const char *username,
1049                                 const char *password,
1050                                 const char *domain)
1051 {
1052         CLIENT_DFS_REFERRAL *refs = NULL;
1053         size_t num_refs = 0;
1054         uint16 consumed;
1055         char *fullpath = NULL;
1056         bool res;
1057         uint16 cnum;
1058         char *newextrapath = NULL;
1059
1060         if (!cli || !sharename) {
1061                 return false;
1062         }
1063
1064         cnum = cli->cnum;
1065
1066         /* special case.  never check for a referral on the IPC$ share */
1067
1068         if (strequal(sharename, "IPC$")) {
1069                 return false;
1070         }
1071
1072         /* send a trans2_query_path_info to check for a referral */
1073
1074         fullpath = talloc_asprintf(ctx, "\\%s\\%s", cli->desthost, sharename );
1075         if (!fullpath) {
1076                 return false;
1077         }
1078
1079         /* check for the referral */
1080
1081         if (!NT_STATUS_IS_OK(cli_tcon_andx(cli, "IPC$", "IPC", NULL, 0))) {
1082                 return false;
1083         }
1084
1085         if (force_encrypt) {
1086                 NTSTATUS status = cli_cm_force_encryption(cli,
1087                                         username,
1088                                         password,
1089                                         lp_workgroup(),
1090                                         "IPC$");
1091                 if (!NT_STATUS_IS_OK(status)) {
1092                         return false;
1093                 }
1094         }
1095
1096         res = cli_dfs_get_referral(ctx, cli, fullpath, &refs, &num_refs, &consumed);
1097
1098         if (!cli_tdis(cli)) {
1099                 return false;
1100         }
1101
1102         cli->cnum = cnum;
1103
1104         if (!res || !num_refs) {
1105                 return false;
1106         }
1107
1108         if (!refs[0].dfspath) {
1109                 return false;
1110         }
1111
1112         split_dfs_path(ctx, refs[0].dfspath, pp_newserver,
1113                         pp_newshare, &newextrapath );
1114
1115         if ((*pp_newserver == NULL) || (*pp_newshare == NULL)) {
1116                 return false;
1117         }
1118
1119         /* check that this is not a self-referral */
1120
1121         if (strequal(cli->desthost, *pp_newserver) &&
1122                         strequal(sharename, *pp_newshare)) {
1123                 return false;
1124         }
1125
1126         return true;
1127 }