source: branches/samba-3.3.x/source/libsmb/clientgen.c@ 396

Last change on this file since 396 was 370, checked in by Herwig Bauernfeind, 16 years ago

Update Samba 3.3 to 3.3.10 (source)
File size: 18.9 KB
Line 
1/*
2 Unix SMB/CIFS implementation.
3 SMB client generic functions
4 Copyright (C) Andrew Tridgell 1994-1998
5 Copyright (C) Jeremy Allison 2007.
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>.
19*/
20
21#include "includes.h"
22
23/*******************************************************************
24 Setup the word count and byte count for a client smb message.
25********************************************************************/
26
27int cli_set_message(char *buf,int num_words,int num_bytes,bool zero)
28{
29 if (zero && (num_words || num_bytes)) {
30 memset(buf + smb_size,'\0',num_words*2 + num_bytes);
31 }
32 SCVAL(buf,smb_wct,num_words);
33 SSVAL(buf,smb_vwv + num_words*SIZEOFWORD,num_bytes);
34 smb_setlen(buf,smb_size + num_words*2 + num_bytes - 4);
35 return (smb_size + num_words*2 + num_bytes);
36}
37
38/****************************************************************************
39 Change the timeout (in milliseconds).
40****************************************************************************/
41
42unsigned int cli_set_timeout(struct cli_state *cli, unsigned int timeout)
43{
44 unsigned int old_timeout = cli->timeout;
45 cli->timeout = timeout;
46 return old_timeout;
47}
48
49/****************************************************************************
50 Change the port number used to call on.
51****************************************************************************/
52
53int cli_set_port(struct cli_state *cli, int port)
54{
55 cli->port = port;
56 return port;
57}
58
59/****************************************************************************
60 Read an smb from a fd ignoring all keepalive packets.
61 The timeout is in milliseconds
62
63 This is exactly the same as receive_smb except that it never returns
64 a session keepalive packet (just as receive_smb used to do).
65 receive_smb was changed to return keepalives as the oplock processing means this call
66 should never go into a blocking read.
67****************************************************************************/
68
69static ssize_t client_receive_smb(struct cli_state *cli, size_t maxlen)
70{
71 size_t len;
72
73 for(;;) {
74 NTSTATUS status;
75
76 set_smb_read_error(&cli->smb_rw_error, SMB_READ_OK);
77
78 status = receive_smb_raw(cli->fd, cli->inbuf, cli->bufsize,
79 cli->timeout, maxlen, &len);
80 if (!NT_STATUS_IS_OK(status)) {
81 DEBUG(10,("client_receive_smb failed\n"));
82 show_msg(cli->inbuf);
83
84 if (NT_STATUS_EQUAL(status, NT_STATUS_END_OF_FILE)) {
85 set_smb_read_error(&cli->smb_rw_error,
86 SMB_READ_EOF);
87 return -1;
88 }
89
90 if (NT_STATUS_EQUAL(status, NT_STATUS_IO_TIMEOUT)) {
91 set_smb_read_error(&cli->smb_rw_error,
92 SMB_READ_TIMEOUT);
93 return -1;
94 }
95
96 set_smb_read_error(&cli->smb_rw_error, SMB_READ_ERROR);
97 return -1;
98 }
99
100 /*
101 * I don't believe len can be < 0 with NT_STATUS_OK
102 * returned above, but this check doesn't hurt. JRA.
103 */
104
105 if ((ssize_t)len < 0) {
106 return len;
107 }
108
109 /* Ignore session keepalive packets. */
110 if(CVAL(cli->inbuf,0) != SMBkeepalive) {
111 break;
112 }
113 }
114
115 if (cli_encryption_on(cli)) {
116 NTSTATUS status = cli_decrypt_message(cli);
117 if (!NT_STATUS_IS_OK(status)) {
118 DEBUG(0, ("SMB decryption failed on incoming packet! Error %s\n",
119 nt_errstr(status)));
120 cli->smb_rw_error = SMB_READ_BAD_DECRYPT;
121 return -1;
122 }
123 }
124
125 show_msg(cli->inbuf);
126 return len;
127}
128
129/****************************************************************************
130 Recv an smb.
131****************************************************************************/
132
133bool cli_receive_smb(struct cli_state *cli)
134{
135 ssize_t len;
136
137 /* fd == -1 causes segfaults -- Tom (tom@ninja.nl) */
138 if (cli->fd == -1)
139 return false;
140
141 again:
142 len = client_receive_smb(cli, 0);
143
144 if (len > 0) {
145 /* it might be an oplock break request */
146 if (!(CVAL(cli->inbuf, smb_flg) & FLAG_REPLY) &&
147 CVAL(cli->inbuf,smb_com) == SMBlockingX &&
148 SVAL(cli->inbuf,smb_vwv6) == 0 &&
149 SVAL(cli->inbuf,smb_vwv7) == 0) {
150 if (cli->oplock_handler) {
151 int fnum = SVAL(cli->inbuf,smb_vwv2);
152 unsigned char level = CVAL(cli->inbuf,smb_vwv3+1);
153 if (!cli->oplock_handler(cli, fnum, level)) {
154 return false;
155 }
156 }
157 /* try to prevent loops */
158 SCVAL(cli->inbuf,smb_com,0xFF);
159 goto again;
160 }
161 }
162
163 /* If the server is not responding, note that now */
164 if (len < 0) {
165 DEBUG(0, ("Receiving SMB: Server stopped responding\n"));
166 close(cli->fd);
167 cli->fd = -1;
168 return false;
169 }
170
171 if (!cli_check_sign_mac(cli, cli->inbuf)) {
172 /*
173 * If we get a signature failure in sessionsetup, then
174 * the server sometimes just reflects the sent signature
175 * back to us. Detect this and allow the upper layer to
176 * retrieve the correct Windows error message.
177 */
178 if (CVAL(cli->outbuf,smb_com) == SMBsesssetupX &&
179 (smb_len(cli->inbuf) > (smb_ss_field + 8 - 4)) &&
180 (SVAL(cli->inbuf,smb_flg2) & FLAGS2_SMB_SECURITY_SIGNATURES) &&
181 memcmp(&cli->outbuf[smb_ss_field],&cli->inbuf[smb_ss_field],8) == 0 &&
182 cli_is_error(cli)) {
183
184 /*
185 * Reflected signature on login error.
186 * Set bad sig but don't close fd.
187 */
188 cli->smb_rw_error = SMB_READ_BAD_SIG;
189 return true;
190 }
191
192 DEBUG(0, ("SMB Signature verification failed on incoming packet!\n"));
193 cli->smb_rw_error = SMB_READ_BAD_SIG;
194 close(cli->fd);
195 cli->fd = -1;
196 return false;
197 };
198 return true;
199}
200
201/****************************************************************************
202 Read the data portion of a readX smb.
203 The timeout is in milliseconds
204****************************************************************************/
205
206ssize_t cli_receive_smb_data(struct cli_state *cli, char *buffer, size_t len)
207{
208 NTSTATUS status;
209
210 set_smb_read_error(&cli->smb_rw_error, SMB_READ_OK);
211
212 status = read_socket_with_timeout(
213 cli->fd, buffer, len, len, cli->timeout, NULL);
214 if (NT_STATUS_IS_OK(status)) {
215 return len;
216 }
217
218 if (NT_STATUS_EQUAL(status, NT_STATUS_END_OF_FILE)) {
219 set_smb_read_error(&cli->smb_rw_error, SMB_READ_EOF);
220 return -1;
221 }
222
223 if (NT_STATUS_EQUAL(status, NT_STATUS_IO_TIMEOUT)) {
224 set_smb_read_error(&cli->smb_rw_error, SMB_READ_TIMEOUT);
225 return -1;
226 }
227
228 set_smb_read_error(&cli->smb_rw_error, SMB_READ_ERROR);
229 return -1;
230}
231
232static ssize_t write_socket(int fd, const char *buf, size_t len)
233{
234 ssize_t ret=0;
235
236 DEBUG(6,("write_socket(%d,%d)\n",fd,(int)len));
237 ret = write_data(fd,buf,len);
238
239 DEBUG(6,("write_socket(%d,%d) wrote %d\n",fd,(int)len,(int)ret));
240 if(ret <= 0)
241 DEBUG(0,("write_socket: Error writing %d bytes to socket %d: ERRNO = %s\n",
242 (int)len, fd, strerror(errno) ));
243
244 return(ret);
245}
246
247/****************************************************************************
248 Send an smb to a fd.
249****************************************************************************/
250
251bool cli_send_smb(struct cli_state *cli)
252{
253 size_t len;
254 size_t nwritten=0;
255 ssize_t ret;
256 char *buf_out = cli->outbuf;
257 bool enc_on = cli_encryption_on(cli);
258
259 /* fd == -1 causes segfaults -- Tom (tom@ninja.nl) */
260 if (cli->fd == -1)
261 return false;
262
263 cli_calculate_sign_mac(cli, cli->outbuf);
264
265 if (enc_on) {
266 NTSTATUS status = cli_encrypt_message(cli, cli->outbuf,
267 &buf_out);
268 if (!NT_STATUS_IS_OK(status)) {
269 close(cli->fd);
270 cli->fd = -1;
271 cli->smb_rw_error = SMB_WRITE_ERROR;
272 DEBUG(0,("Error in encrypting client message. Error %s\n",
273 nt_errstr(status) ));
274 return false;
275 }
276 }
277
278 len = smb_len(buf_out) + 4;
279
280 while (nwritten < len) {
281 ret = write_socket(cli->fd,buf_out+nwritten,len - nwritten);
282 if (ret <= 0) {
283 if (enc_on) {
284 cli_free_enc_buffer(cli, buf_out);
285 }
286 close(cli->fd);
287 cli->fd = -1;
288 cli->smb_rw_error = SMB_WRITE_ERROR;
289 DEBUG(0,("Error writing %d bytes to client. %d (%s)\n",
290 (int)len,(int)ret, strerror(errno) ));
291 return false;
292 }
293 nwritten += ret;
294 }
295
296 if (enc_on) {
297 cli_free_enc_buffer(cli, buf_out);
298 }
299
300 /* Increment the mid so we can tell between responses. */
301 cli->mid++;
302 if (!cli->mid)
303 cli->mid++;
304 return true;
305}
306
307/****************************************************************************
308 Send a "direct" writeX smb to a fd.
309****************************************************************************/
310
311bool cli_send_smb_direct_writeX(struct cli_state *cli,
312 const char *p,
313 size_t extradata)
314{
315 /* First length to send is the offset to the data. */
316 size_t len = SVAL(cli->outbuf,smb_vwv11) + 4;
317 size_t nwritten=0;
318 struct iovec iov[2];
319
320 /* fd == -1 causes segfaults -- Tom (tom@ninja.nl) */
321 if (cli->fd == -1) {
322 return false;
323 }
324
325 if (client_is_signing_on(cli)) {
326 DEBUG(0,("cli_send_smb_large: cannot send signed packet.\n"));
327 return false;
328 }
329
330 iov[0].iov_base = cli->outbuf;
331 iov[0].iov_len = len;
332 iov[1].iov_base = CONST_DISCARD(char *, p);
333 iov[1].iov_len = extradata;
334
335 nwritten = write_data_iov(cli->fd, iov, 2);
336 if (nwritten < (len + extradata)) {
337 close(cli->fd);
338 cli->fd = -1;
339 cli->smb_rw_error = SMB_WRITE_ERROR;
340 DEBUG(0,("Error writing %d bytes to client. (%s)\n",
341 (int)(len+extradata), strerror(errno)));
342 return false;
343 }
344
345 /* Increment the mid so we can tell between responses. */
346 cli->mid++;
347 if (!cli->mid)
348 cli->mid++;
349 return true;
350}
351
352/****************************************************************************
353 Setup basics in a outgoing packet.
354****************************************************************************/
355
356void cli_setup_packet_buf(struct cli_state *cli, char *buf)
357{
358 uint16 flags2;
359 cli->rap_error = 0;
360 SIVAL(buf,smb_rcls,0);
361 SSVAL(buf,smb_pid,cli->pid);
362 memset(buf+smb_pidhigh, 0, 12);
363 SSVAL(buf,smb_uid,cli->vuid);
364 SSVAL(buf,smb_mid,cli->mid);
365
366 if (cli->protocol <= PROTOCOL_CORE) {
367 return;
368 }
369
370 if (cli->case_sensitive) {
371 SCVAL(buf,smb_flg,0x0);
372 } else {
373 /* Default setting, case insensitive. */
374 SCVAL(buf,smb_flg,0x8);
375 }
376 flags2 = FLAGS2_LONG_PATH_COMPONENTS;
377 if (cli->capabilities & CAP_UNICODE)
378 flags2 |= FLAGS2_UNICODE_STRINGS;
379 if ((cli->capabilities & CAP_DFS) && cli->dfsroot)
380 flags2 |= FLAGS2_DFS_PATHNAMES;
381 if (cli->capabilities & CAP_STATUS32)
382 flags2 |= FLAGS2_32_BIT_ERROR_CODES;
383 if (cli->use_spnego)
384 flags2 |= FLAGS2_EXTENDED_SECURITY;
385 SSVAL(buf,smb_flg2, flags2);
386}
387
388void cli_setup_packet(struct cli_state *cli)
389{
390 cli_setup_packet_buf(cli, cli->outbuf);
391}
392
393/****************************************************************************
394 Setup the bcc length of the packet from a pointer to the end of the data.
395****************************************************************************/
396
397void cli_setup_bcc(struct cli_state *cli, void *p)
398{
399 set_message_bcc(cli->outbuf, PTR_DIFF(p, smb_buf(cli->outbuf)));
400}
401
402/****************************************************************************
403 Initialise credentials of a client structure.
404****************************************************************************/
405
406void cli_init_creds(struct cli_state *cli, const char *username, const char *domain, const char *password)
407{
408 fstrcpy(cli->domain, domain);
409 fstrcpy(cli->user_name, username);
410 pwd_set_cleartext(&cli->pwd, password);
411 if ((username == NULL) || (!*username)) {
412 cli->pwd.null_pwd = true;
413 }
414
415 DEBUG(10,("cli_init_creds: user %s domain %s\n", cli->user_name, cli->domain));
416}
417
418/****************************************************************************
419 Set the signing state (used from the command line).
420****************************************************************************/
421
422void cli_setup_signing_state(struct cli_state *cli, int signing_state)
423{
424 if (signing_state == Undefined)
425 return;
426
427 if (signing_state == false) {
428 cli->sign_info.allow_smb_signing = false;
429 cli->sign_info.mandatory_signing = false;
430 return;
431 }
432
433 cli->sign_info.allow_smb_signing = true;
434
435 if (signing_state == Required)
436 cli->sign_info.mandatory_signing = true;
437}
438
439/****************************************************************************
440 Initialise a client structure. Always returns a malloc'ed struct.
441****************************************************************************/
442
443struct cli_state *cli_initialise(void)
444{
445 struct cli_state *cli = NULL;
446
447#ifndef __OS2__
448 /* Check the effective uid - make sure we are not setuid */
449 if (is_setuid_root()) {
450 DEBUG(0,("libsmb based programs must *NOT* be setuid root.\n"));
451 return NULL;
452 }
453#endif
454 cli = talloc(NULL, struct cli_state);
455 if (!cli) {
456 return NULL;
457 }
458
459 ZERO_STRUCTP(cli);
460
461 cli->port = 0;
462 cli->fd = -1;
463 cli->cnum = -1;
464 cli->pid = (uint16)sys_getpid();
465 cli->mid = 1;
466 cli->vuid = UID_FIELD_INVALID;
467 cli->protocol = PROTOCOL_NT1;
468 cli->timeout = 20000; /* Timeout is in milliseconds. */
469 cli->bufsize = CLI_BUFFER_SIZE+4;
470 cli->max_xmit = cli->bufsize;
471 cli->outbuf = (char *)SMB_MALLOC(cli->bufsize+SAFETY_MARGIN);
472 cli->inbuf = (char *)SMB_MALLOC(cli->bufsize+SAFETY_MARGIN);
473 cli->oplock_handler = cli_oplock_ack;
474 cli->case_sensitive = false;
475 cli->smb_rw_error = SMB_READ_OK;
476
477 cli->use_spnego = lp_client_use_spnego();
478
479 cli->capabilities = CAP_UNICODE | CAP_STATUS32 | CAP_DFS;
480
481 /* Set the CLI_FORCE_DOSERR environment variable to test
482 client routines using DOS errors instead of STATUS32
483 ones. This intended only as a temporary hack. */
484 if (getenv("CLI_FORCE_DOSERR"))
485 cli->force_dos_errors = true;
486
487 if (lp_client_signing())
488 cli->sign_info.allow_smb_signing = true;
489
490 if (lp_client_signing() == Required)
491 cli->sign_info.mandatory_signing = true;
492
493 if (!cli->outbuf || !cli->inbuf)
494 goto error;
495
496 memset(cli->outbuf, 0, cli->bufsize);
497 memset(cli->inbuf, 0, cli->bufsize);
498
499
500#if defined(DEVELOPER)
501 /* just because we over-allocate, doesn't mean it's right to use it */
502 clobber_region(FUNCTION_MACRO, __LINE__, cli->outbuf+cli->bufsize, SAFETY_MARGIN);
503 clobber_region(FUNCTION_MACRO, __LINE__, cli->inbuf+cli->bufsize, SAFETY_MARGIN);
504#endif
505
506 /* initialise signing */
507 cli_null_set_signing(cli);
508
509 cli->initialised = 1;
510
511 return cli;
512
513 /* Clean up after malloc() error */
514
515 error:
516
517 SAFE_FREE(cli->inbuf);
518 SAFE_FREE(cli->outbuf);
519 TALLOC_FREE(cli);
520 return NULL;
521}
522
523/****************************************************************************
524 Close all pipes open on this session.
525****************************************************************************/
526
527void cli_nt_pipes_close(struct cli_state *cli)
528{
529 while (cli->pipe_list != NULL) {
530 /*
531 * No TALLOC_FREE here!
532 */
533 talloc_free(cli->pipe_list);
534 }
535}
536
537/****************************************************************************
538 Shutdown a client structure.
539****************************************************************************/
540
541void cli_shutdown(struct cli_state *cli)
542{
543 cli_nt_pipes_close(cli);
544
545 /*
546 * tell our peer to free his resources. Wihtout this, when an
547 * application attempts to do a graceful shutdown and calls
548 * smbc_free_context() to clean up all connections, some connections
549 * can remain active on the peer end, until some (long) timeout period
550 * later. This tree disconnect forces the peer to clean up, since the
551 * connection will be going away.
552 *
553 * Also, do not do tree disconnect when cli->smb_rw_error is SMB_DO_NOT_DO_TDIS
554 * the only user for this so far is smbmount which passes opened connection
555 * down to kernel's smbfs module.
556 */
557 if ( (cli->cnum != (uint16)-1) && (cli->smb_rw_error != SMB_DO_NOT_DO_TDIS ) ) {
558 cli_tdis(cli);
559 }
560
561 SAFE_FREE(cli->outbuf);
562 SAFE_FREE(cli->inbuf);
563
564 cli_free_signing_context(cli);
565 data_blob_free(&cli->secblob);
566 data_blob_free(&cli->user_session_key);
567
568 if (cli->fd != -1) {
569 close(cli->fd);
570 }
571 cli->fd = -1;
572 cli->smb_rw_error = SMB_READ_OK;
573
574 TALLOC_FREE(cli);
575}
576
577/****************************************************************************
578 Set socket options on a open connection.
579****************************************************************************/
580
581void cli_sockopt(struct cli_state *cli, const char *options)
582{
583 set_socket_options(cli->fd, options);
584}
585
586/****************************************************************************
587 Set the PID to use for smb messages. Return the old pid.
588****************************************************************************/
589
590uint16 cli_setpid(struct cli_state *cli, uint16 pid)
591{
592 uint16 ret = cli->pid;
593 cli->pid = pid;
594 return ret;
595}
596
597/****************************************************************************
598 Set the case sensitivity flag on the packets. Returns old state.
599****************************************************************************/
600
601bool cli_set_case_sensitive(struct cli_state *cli, bool case_sensitive)
602{
603 bool ret = cli->case_sensitive;
604 cli->case_sensitive = case_sensitive;
605 return ret;
606}
607
608/****************************************************************************
609Send a keepalive packet to the server
610****************************************************************************/
611
612bool cli_send_keepalive(struct cli_state *cli)
613{
614 if (cli->fd == -1) {
615 DEBUG(3, ("cli_send_keepalive: fd == -1\n"));
616 return false;
617 }
618 if (!send_keepalive(cli->fd)) {
619 close(cli->fd);
620 cli->fd = -1;
621 DEBUG(0,("Error sending keepalive packet to client.\n"));
622 return false;
623 }
624 return true;
625}
626
627/****************************************************************************
628 Send/receive a SMBecho command: ping the server
629****************************************************************************/
630
631bool cli_echo(struct cli_state *cli, uint16 num_echos,
632 unsigned char *data, size_t length)
633{
634 char *p;
635 int i;
636
637 SMB_ASSERT(length < 1024);
638
639 memset(cli->outbuf,'\0',smb_size);
640 cli_set_message(cli->outbuf,1,length,true);
641 SCVAL(cli->outbuf,smb_com,SMBecho);
642 SSVAL(cli->outbuf,smb_tid,65535);
643 SSVAL(cli->outbuf,smb_vwv0,num_echos);
644 cli_setup_packet(cli);
645 p = smb_buf(cli->outbuf);
646 memcpy(p, data, length);
647 p += length;
648
649 cli_setup_bcc(cli, p);
650
651 cli_send_smb(cli);
652
653 for (i=0; i<num_echos; i++) {
654 if (!cli_receive_smb(cli)) {
655 return false;
656 }
657
658 if (cli_is_error(cli)) {
659 return false;
660 }
661 }
662
663 return true;
664}
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