source: branches/samba-3.2.x/source/libsmb/libsmb_server.c

Last change on this file was 232, checked in by Herwig Bauernfeind, 16 years ago

Update 3.2 branch to 3.2.8
File size: 26.6 KB
Line 
1/*
2 Unix SMB/Netbios implementation.
3 SMB client library implementation
4 Copyright (C) Andrew Tridgell 1998
5 Copyright (C) Richard Sharpe 2000, 2002
6 Copyright (C) John Terpstra 2000
7 Copyright (C) Tom Jansen (Ninja ISD) 2002
8 Copyright (C) Derrell Lipman 2003-2008
9 Copyright (C) Jeremy Allison 2007, 2008
10
11 This program is free software; you can redistribute it and/or modify
12 it under the terms of the GNU General Public License as published by
13 the Free Software Foundation; either version 3 of the License, or
14 (at your option) any later version.
15
16 This program is distributed in the hope that it will be useful,
17 but WITHOUT ANY WARRANTY; without even the implied warranty of
18 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 GNU General Public License for more details.
20
21 You should have received a copy of the GNU General Public License
22 along with this program. If not, see <http://www.gnu.org/licenses/>.
23*/
24
25#include "includes.h"
26#include "libsmbclient.h"
27#include "libsmb_internal.h"
28
29
30/*
31 * Check a server for being alive and well.
32 * returns 0 if the server is in shape. Returns 1 on error
33 *
34 * Also useable outside libsmbclient to enable external cache
35 * to do some checks too.
36 */
37int
38SMBC_check_server(SMBCCTX * context,
39 SMBCSRV * server)
40{
41 socklen_t size;
42 struct sockaddr addr;
43
44 size = sizeof(addr);
45 return (getpeername(server->cli->fd, &addr, &size) == -1);
46}
47
48/*
49 * Remove a server from the cached server list it's unused.
50 * On success, 0 is returned. 1 is returned if the server could not be removed.
51 *
52 * Also useable outside libsmbclient
53 */
54int
55SMBC_remove_unused_server(SMBCCTX * context,
56 SMBCSRV * srv)
57{
58 SMBCFILE * file;
59
60 /* are we being fooled ? */
61 if (!context || !context->internal->initialized || !srv) {
62 return 1;
63 }
64
65 /* Check all open files/directories for a relation with this server */
66 for (file = context->internal->files; file; file = file->next) {
67 if (file->srv == srv) {
68 /* Still used */
69 DEBUG(3, ("smbc_remove_usused_server: "
70 "%p still used by %p.\n",
71 srv, file));
72 return 1;
73 }
74 }
75
76 DLIST_REMOVE(context->internal->servers, srv);
77
78 cli_shutdown(srv->cli);
79 srv->cli = NULL;
80
81 DEBUG(3, ("smbc_remove_usused_server: %p removed.\n", srv));
82
83 smbc_getFunctionRemoveCachedServer(context)(context, srv);
84
85 SAFE_FREE(srv);
86 return 0;
87}
88
89/****************************************************************
90 * Call the auth_fn with fixed size (fstring) buffers.
91 ***************************************************************/
92void
93SMBC_call_auth_fn(TALLOC_CTX *ctx,
94 SMBCCTX *context,
95 const char *server,
96 const char *share,
97 char **pp_workgroup,
98 char **pp_username,
99 char **pp_password)
100{
101 fstring workgroup;
102 fstring username;
103 fstring password;
104 smbc_get_auth_data_with_context_fn auth_with_context_fn;
105
106 strlcpy(workgroup, *pp_workgroup, sizeof(workgroup));
107 strlcpy(username, *pp_username, sizeof(username));
108 strlcpy(password, *pp_password, sizeof(password));
109
110 /* See if there's an authentication with context function provided */
111 auth_with_context_fn = smbc_getFunctionAuthDataWithContext(context);
112 if (auth_with_context_fn)
113 {
114 (* auth_with_context_fn)(context,
115 server, share,
116 workgroup, sizeof(workgroup),
117 username, sizeof(username),
118 password, sizeof(password));
119 }
120 else
121 {
122 smbc_getFunctionAuthData(context)(server, share,
123 workgroup, sizeof(workgroup),
124 username, sizeof(username),
125 password, sizeof(password));
126 }
127
128 TALLOC_FREE(*pp_workgroup);
129 TALLOC_FREE(*pp_username);
130 TALLOC_FREE(*pp_password);
131
132 *pp_workgroup = talloc_strdup(ctx, workgroup);
133 *pp_username = talloc_strdup(ctx, username);
134 *pp_password = talloc_strdup(ctx, password);
135}
136
137
138void
139SMBC_get_auth_data(const char *server, const char *share,
140 char *workgroup_buf, int workgroup_buf_len,
141 char *username_buf, int username_buf_len,
142 char *password_buf, int password_buf_len)
143{
144 /* Default function just uses provided data. Nothing to do. */
145}
146
147
148
149SMBCSRV *
150SMBC_find_server(TALLOC_CTX *ctx,
151 SMBCCTX *context,
152 const char *server,
153 const char *share,
154 char **pp_workgroup,
155 char **pp_username,
156 char **pp_password)
157{
158 SMBCSRV *srv;
159 int auth_called = 0;
160
161 if (!pp_workgroup || !pp_username || !pp_password) {
162 return NULL;
163 }
164
165check_server_cache:
166
167 srv = smbc_getFunctionGetCachedServer(context)(context,
168 server, share,
169 *pp_workgroup,
170 *pp_username);
171
172 if (!auth_called && !srv && (!*pp_username || !(*pp_username)[0] ||
173 !*pp_password || !(*pp_password)[0])) {
174 SMBC_call_auth_fn(ctx, context, server, share,
175 pp_workgroup, pp_username, pp_password);
176
177 /*
178 * However, smbc_auth_fn may have picked up info relating to
179 * an existing connection, so try for an existing connection
180 * again ...
181 */
182 auth_called = 1;
183 goto check_server_cache;
184
185 }
186
187 if (srv) {
188 if (smbc_getFunctionCheckServer(context)(context, srv)) {
189 /*
190 * This server is no good anymore
191 * Try to remove it and check for more possible
192 * servers in the cache
193 */
194 if (smbc_getFunctionRemoveUnusedServer(context)(context,
195 srv)) {
196 /*
197 * We could not remove the server completely,
198 * remove it from the cache so we will not get
199 * it again. It will be removed when the last
200 * file/dir is closed.
201 */
202 smbc_getFunctionRemoveCachedServer(context)(context,
203 srv);
204 }
205
206 /*
207 * Maybe there are more cached connections to this
208 * server
209 */
210 goto check_server_cache;
211 }
212
213 return srv;
214 }
215
216 return NULL;
217}
218
219/*
220 * Connect to a server, possibly on an existing connection
221 *
222 * Here, what we want to do is: If the server and username
223 * match an existing connection, reuse that, otherwise, establish a
224 * new connection.
225 *
226 * If we have to create a new connection, call the auth_fn to get the
227 * info we need, unless the username and password were passed in.
228 */
229
230SMBCSRV *
231SMBC_server(TALLOC_CTX *ctx,
232 SMBCCTX *context,
233 bool connect_if_not_found,
234 const char *server,
235 const char *share,
236 char **pp_workgroup,
237 char **pp_username,
238 char **pp_password)
239{
240 SMBCSRV *srv=NULL;
241 struct cli_state *c;
242 struct nmb_name called, calling;
243 const char *server_n = server;
244 struct sockaddr_storage ss;
245 int tried_reverse = 0;
246 int port_try_first;
247 int port_try_next;
248 int is_ipc = (share != NULL && strcmp(share, "IPC$") == 0);
249 uint32 fs_attrs = 0;
250 const char *username_used;
251 NTSTATUS status;
252
253 zero_sockaddr(&ss);
254 ZERO_STRUCT(c);
255
256 if (server[0] == 0) {
257 errno = EPERM;
258 return NULL;
259 }
260
261 /* Look for a cached connection */
262 srv = SMBC_find_server(ctx, context, server, share,
263 pp_workgroup, pp_username, pp_password);
264
265 /*
266 * If we found a connection and we're only allowed one share per
267 * server...
268 */
269 if (srv &&
270 *share != '\0' &&
271 smbc_getOptionOneSharePerServer(context)) {
272
273 /*
274 * ... then if there's no current connection to the share,
275 * connect to it. SMBC_find_server(), or rather the function
276 * pointed to by context->get_cached_srv_fn which
277 * was called by SMBC_find_server(), will have issued a tree
278 * disconnect if the requested share is not the same as the
279 * one that was already connected.
280 */
281 if (srv->cli->cnum == (uint16) -1) {
282 /* Ensure we have accurate auth info */
283 SMBC_call_auth_fn(ctx, context, server, share,
284 pp_workgroup,
285 pp_username,
286 pp_password);
287
288 if (!*pp_workgroup || !*pp_username || !*pp_password) {
289 errno = ENOMEM;
290 cli_shutdown(srv->cli);
291 srv->cli = NULL;
292 smbc_getFunctionRemoveCachedServer(context)(context,
293 srv);
294 return NULL;
295 }
296
297 /*
298 * We don't need to renegotiate encryption
299 * here as the encryption context is not per
300 * tid.
301 */
302
303 if (!cli_send_tconX(srv->cli, share, "?????",
304 *pp_password,
305 strlen(*pp_password)+1)) {
306
307 errno = SMBC_errno(context, srv->cli);
308 cli_shutdown(srv->cli);
309 srv->cli = NULL;
310 smbc_getFunctionRemoveCachedServer(context)(context,
311 srv);
312 srv = NULL;
313 }
314
315 /* Determine if this share supports case sensitivity */
316 if (is_ipc) {
317 DEBUG(4,
318 ("IPC$ so ignore case sensitivity\n"));
319 } else if (!cli_get_fs_attr_info(c, &fs_attrs)) {
320 DEBUG(4, ("Could not retrieve "
321 "case sensitivity flag: %s.\n",
322 cli_errstr(c)));
323
324 /*
325 * We can't determine the case sensitivity of
326 * the share. We have no choice but to use the
327 * user-specified case sensitivity setting.
328 */
329 if (smbc_getOptionCaseSensitive(context)) {
330 cli_set_case_sensitive(c, True);
331 } else {
332 cli_set_case_sensitive(c, False);
333 }
334 } else {
335 DEBUG(4,
336 ("Case sensitive: %s\n",
337 (fs_attrs & FILE_CASE_SENSITIVE_SEARCH
338 ? "True"
339 : "False")));
340 cli_set_case_sensitive(
341 c,
342 (fs_attrs & FILE_CASE_SENSITIVE_SEARCH
343 ? True
344 : False));
345 }
346
347 /*
348 * Regenerate the dev value since it's based on both
349 * server and share
350 */
351 if (srv) {
352 srv->dev = (dev_t)(str_checksum(server) ^
353 str_checksum(share));
354 }
355 }
356 }
357
358 /* If we have a connection... */
359 if (srv) {
360
361 /* ... then we're done here. Give 'em what they came for. */
362 return srv;
363 }
364
365 /* If we're not asked to connect when a connection doesn't exist... */
366 if (! connect_if_not_found) {
367 /* ... then we're done here. */
368 return NULL;
369 }
370
371 if (!*pp_workgroup || !*pp_username || !*pp_password) {
372 errno = ENOMEM;
373 return NULL;
374 }
375
376 make_nmb_name(&calling, smbc_getNetbiosName(context), 0x0);
377 make_nmb_name(&called , server, 0x20);
378
379 DEBUG(4,("SMBC_server: server_n=[%s] server=[%s]\n", server_n, server));
380
381 DEBUG(4,(" -> server_n=[%s] server=[%s]\n", server_n, server));
382
383again:
384
385 zero_sockaddr(&ss);
386
387 /* have to open a new connection */
388 if ((c = cli_initialise()) == NULL) {
389 errno = ENOMEM;
390 return NULL;
391 }
392
393 if (smbc_getOptionUseKerberos(context)) {
394 c->use_kerberos = True;
395 }
396
397 if (smbc_getOptionFallbackAfterKerberos(context)) {
398 c->fallback_after_kerberos = True;
399 }
400
401 c->timeout = smbc_getTimeout(context);
402
403 /*
404 * Force use of port 139 for first try if share is $IPC, empty, or
405 * null, so browse lists can work
406 */
407 if (share == NULL || *share == '\0' || is_ipc) {
408 port_try_first = 139;
409 port_try_next = 445;
410 } else {
411 port_try_first = 445;
412 port_try_next = 139;
413 }
414
415 c->port = port_try_first;
416
417 status = cli_connect(c, server_n, &ss);
418 if (!NT_STATUS_IS_OK(status)) {
419
420 /* First connection attempt failed. Try alternate port. */
421 c->port = port_try_next;
422
423 status = cli_connect(c, server_n, &ss);
424 if (!NT_STATUS_IS_OK(status)) {
425 cli_shutdown(c);
426 errno = ETIMEDOUT;
427 return NULL;
428 }
429 }
430
431 if (!cli_session_request(c, &calling, &called)) {
432 cli_shutdown(c);
433 if (strcmp(called.name, "*SMBSERVER")) {
434 make_nmb_name(&called , "*SMBSERVER", 0x20);
435 goto again;
436 } else { /* Try one more time, but ensure we don't loop */
437
438 /* Only try this if server is an IP address ... */
439
440 if (is_ipaddress(server) && !tried_reverse) {
441 fstring remote_name;
442 struct sockaddr_storage rem_ss;
443
444 if (!interpret_string_addr(&rem_ss, server,
445 NI_NUMERICHOST)) {
446 DEBUG(4, ("Could not convert IP address "
447 "%s to struct sockaddr_storage\n",
448 server));
449 errno = ETIMEDOUT;
450 return NULL;
451 }
452
453 tried_reverse++; /* Yuck */
454
455 if (name_status_find("*", 0, 0,
456 &rem_ss, remote_name)) {
457 make_nmb_name(&called,
458 remote_name,
459 0x20);
460 goto again;
461 }
462 }
463 }
464 errno = ETIMEDOUT;
465 return NULL;
466 }
467
468 DEBUG(4,(" session request ok\n"));
469
470 if (!cli_negprot(c)) {
471 cli_shutdown(c);
472 errno = ETIMEDOUT;
473 return NULL;
474 }
475
476 username_used = *pp_username;
477
478 if (!NT_STATUS_IS_OK(cli_session_setup(c, username_used,
479 *pp_password,
480 strlen(*pp_password),
481 *pp_password,
482 strlen(*pp_password),
483 *pp_workgroup))) {
484
485 /* Failed. Try an anonymous login, if allowed by flags. */
486 username_used = "";
487
488 if (smbc_getOptionNoAutoAnonymousLogin(context) ||
489 !NT_STATUS_IS_OK(cli_session_setup(c, username_used,
490 *pp_password, 1,
491 *pp_password, 0,
492 *pp_workgroup))) {
493
494 cli_shutdown(c);
495 errno = EPERM;
496 return NULL;
497 }
498 }
499
500 DEBUG(4,(" session setup ok\n"));
501
502 if (!cli_send_tconX(c, share, "?????",
503 *pp_password, strlen(*pp_password)+1)) {
504 errno = SMBC_errno(context, c);
505 cli_shutdown(c);
506 return NULL;
507 }
508
509 DEBUG(4,(" tconx ok\n"));
510
511 /* Determine if this share supports case sensitivity */
512 if (is_ipc) {
513 DEBUG(4, ("IPC$ so ignore case sensitivity\n"));
514 } else if (!cli_get_fs_attr_info(c, &fs_attrs)) {
515 DEBUG(4, ("Could not retrieve case sensitivity flag: %s.\n",
516 cli_errstr(c)));
517
518 /*
519 * We can't determine the case sensitivity of the share. We
520 * have no choice but to use the user-specified case
521 * sensitivity setting.
522 */
523 if (smbc_getOptionCaseSensitive(context)) {
524 cli_set_case_sensitive(c, True);
525 } else {
526 cli_set_case_sensitive(c, False);
527 }
528 } else {
529 DEBUG(4, ("Case sensitive: %s\n",
530 (fs_attrs & FILE_CASE_SENSITIVE_SEARCH
531 ? "True"
532 : "False")));
533 cli_set_case_sensitive(c,
534 (fs_attrs & FILE_CASE_SENSITIVE_SEARCH
535 ? True
536 : False));
537 }
538
539 if (context->internal->smb_encryption_level) {
540 /* Attempt UNIX smb encryption. */
541 if (!NT_STATUS_IS_OK(cli_force_encryption(c,
542 username_used,
543 *pp_password,
544 *pp_workgroup))) {
545
546 /*
547 * context->smb_encryption_level == 1
548 * means don't fail if encryption can't be negotiated,
549 * == 2 means fail if encryption can't be negotiated.
550 */
551
552 DEBUG(4,(" SMB encrypt failed\n"));
553
554 if (context->internal->smb_encryption_level == 2) {
555 cli_shutdown(c);
556 errno = EPERM;
557 return NULL;
558 }
559 }
560 DEBUG(4,(" SMB encrypt ok\n"));
561 }
562
563 /*
564 * Ok, we have got a nice connection
565 * Let's allocate a server structure.
566 */
567
568 srv = SMB_MALLOC_P(SMBCSRV);
569 if (!srv) {
570 errno = ENOMEM;
571 goto failed;
572 }
573
574 ZERO_STRUCTP(srv);
575 srv->cli = c;
576 srv->dev = (dev_t)(str_checksum(server) ^ str_checksum(share));
577 srv->no_pathinfo = False;
578 srv->no_pathinfo2 = False;
579 srv->no_nt_session = False;
580
581 /* now add it to the cache (internal or external) */
582 /* Let the cache function set errno if it wants to */
583 errno = 0;
584 if (smbc_getFunctionAddCachedServer(context)(context, srv,
585 server, share,
586 *pp_workgroup,
587 *pp_username)) {
588 int saved_errno = errno;
589 DEBUG(3, (" Failed to add server to cache\n"));
590 errno = saved_errno;
591 if (errno == 0) {
592 errno = ENOMEM;
593 }
594 goto failed;
595 }
596
597 DEBUG(2, ("Server connect ok: //%s/%s: %p\n",
598 server, share, srv));
599
600 DLIST_ADD(context->internal->servers, srv);
601 return srv;
602
603failed:
604 cli_shutdown(c);
605 if (!srv) {
606 return NULL;
607 }
608
609 SAFE_FREE(srv);
610 return NULL;
611}
612
613/*
614 * Connect to a server for getting/setting attributes, possibly on an existing
615 * connection. This works similarly to SMBC_server().
616 */
617SMBCSRV *
618SMBC_attr_server(TALLOC_CTX *ctx,
619 SMBCCTX *context,
620 const char *server,
621 const char *share,
622 char **pp_workgroup,
623 char **pp_username,
624 char **pp_password)
625{
626 int flags;
627 struct sockaddr_storage ss;
628 struct cli_state *ipc_cli;
629 struct rpc_pipe_client *pipe_hnd;
630 NTSTATUS nt_status;
631 SMBCSRV *ipc_srv=NULL;
632
633 /*
634 * See if we've already created this special connection. Reference
635 * our "special" share name '*IPC$', which is an impossible real share
636 * name due to the leading asterisk.
637 */
638 ipc_srv = SMBC_find_server(ctx, context, server, "*IPC$",
639 pp_workgroup, pp_username, pp_password);
640 if (!ipc_srv) {
641
642 /* We didn't find a cached connection. Get the password */
643 if (!*pp_password || (*pp_password)[0] == '\0') {
644 /* ... then retrieve it now. */
645 SMBC_call_auth_fn(ctx, context, server, share,
646 pp_workgroup,
647 pp_username,
648 pp_password);
649 if (!*pp_workgroup || !*pp_username || !*pp_password) {
650 errno = ENOMEM;
651 return NULL;
652 }
653 }
654
655 flags = 0;
656 if (smbc_getOptionUseKerberos(context)) {
657 flags |= CLI_FULL_CONNECTION_USE_KERBEROS;
658 }
659
660 zero_sockaddr(&ss);
661 nt_status = cli_full_connection(&ipc_cli,
662 global_myname(), server,
663 &ss, 0, "IPC$", "?????",
664 *pp_username,
665 *pp_workgroup,
666 *pp_password,
667 flags,
668 Undefined, NULL);
669 if (! NT_STATUS_IS_OK(nt_status)) {
670 DEBUG(1,("cli_full_connection failed! (%s)\n",
671 nt_errstr(nt_status)));
672 errno = ENOTSUP;
673 return NULL;
674 }
675
676 if (context->internal->smb_encryption_level) {
677 /* Attempt UNIX smb encryption. */
678 if (!NT_STATUS_IS_OK(cli_force_encryption(ipc_cli,
679 *pp_username,
680 *pp_password,
681 *pp_workgroup))) {
682
683 /*
684 * context->smb_encryption_level ==
685 * 1 means don't fail if encryption can't be
686 * negotiated, == 2 means fail if encryption
687 * can't be negotiated.
688 */
689
690 DEBUG(4,(" SMB encrypt failed on IPC$\n"));
691
692 if (context->internal->smb_encryption_level == 2) {
693 cli_shutdown(ipc_cli);
694 errno = EPERM;
695 return NULL;
696 }
697 }
698 DEBUG(4,(" SMB encrypt ok on IPC$\n"));
699 }
700
701 ipc_srv = SMB_MALLOC_P(SMBCSRV);
702 if (!ipc_srv) {
703 errno = ENOMEM;
704 cli_shutdown(ipc_cli);
705 return NULL;
706 }
707
708 ZERO_STRUCTP(ipc_srv);
709 ipc_srv->cli = ipc_cli;
710
711 pipe_hnd = cli_rpc_pipe_open_noauth(ipc_srv->cli,
712 PI_LSARPC,
713 &nt_status);
714 if (!pipe_hnd) {
715 DEBUG(1, ("cli_nt_session_open fail!\n"));
716 errno = ENOTSUP;
717 cli_shutdown(ipc_srv->cli);
718 free(ipc_srv);
719 return NULL;
720 }
721
722 /*
723 * Some systems don't support
724 * SEC_RIGHTS_MAXIMUM_ALLOWED, but NT sends 0x2000000
725 * so we might as well do it too.
726 */
727
728 nt_status = rpccli_lsa_open_policy(
729 pipe_hnd,
730 talloc_tos(),
731 True,
732 GENERIC_EXECUTE_ACCESS,
733 &ipc_srv->pol);
734
735 if (!NT_STATUS_IS_OK(nt_status)) {
736 errno = SMBC_errno(context, ipc_srv->cli);
737 cli_shutdown(ipc_srv->cli);
738 return NULL;
739 }
740
741 /* now add it to the cache (internal or external) */
742
743 errno = 0; /* let cache function set errno if it likes */
744 if (smbc_getFunctionAddCachedServer(context)(context, ipc_srv,
745 server,
746 "*IPC$",
747 *pp_workgroup,
748 *pp_username)) {
749 DEBUG(3, (" Failed to add server to cache\n"));
750 if (errno == 0) {
751 errno = ENOMEM;
752 }
753 cli_shutdown(ipc_srv->cli);
754 free(ipc_srv);
755 return NULL;
756 }
757
758 DLIST_ADD(context->internal->servers, ipc_srv);
759 }
760
761 return ipc_srv;
762}
Note: See TracBrowser for help on using the repository browser.