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tevent: add and use debug class for tevent
[Samba.git] / source3 / smbd / process.c
blobc83f3bcfa721def41ebe2ace3a238df220d15f3f
1 /*
2 Unix SMB/CIFS implementation.
3 process incoming packets - main loop
4 Copyright (C) Andrew Tridgell 1992-1998
5 Copyright (C) Volker Lendecke 2005-2007
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 #include "../lib/tsocket/tsocket.h"
23 #include "system/filesys.h"
24 #include "smbd/smbd.h"
25 #include "smbd/globals.h"
26 #include "librpc/gen_ndr/netlogon.h"
27 #include "../lib/async_req/async_sock.h"
28 #include "ctdbd_conn.h"
29 #include "../lib/util/select.h"
30 #include "printing/queue_process.h"
31 #include "system/select.h"
32 #include "passdb.h"
33 #include "auth.h"
34 #include "messages.h"
35 #include "smbprofile.h"
36 #include "rpc_server/spoolss/srv_spoolss_nt.h"
37 #include "libsmb/libsmb.h"
38 #include "../lib/util/tevent_ntstatus.h"
39 #include "../libcli/security/dom_sid.h"
40 #include "../libcli/security/security_token.h"
41 #include "lib/id_cache.h"
42 #include "lib/sys_rw_data.h"
43 #include "serverid.h"
44 #include "system/threads.h"
45
46 /* Internal message queue for deferred opens. */
47 struct pending_message_list {
48 struct pending_message_list *next, *prev;
49 struct timeval request_time; /* When was this first issued? */
50 struct smbd_server_connection *sconn;
51 struct smbXsrv_connection *xconn;
52 struct tevent_timer *te;
53 struct smb_perfcount_data pcd;
54 uint32_t seqnum;
55 bool encrypted;
56 bool processed;
57 DATA_BLOB buf;
58 struct deferred_open_record *open_rec;
59 };
60
61 static void construct_reply_common(uint8_t cmd, const uint8_t *inbuf,
62 char *outbuf);
63 static struct pending_message_list *get_deferred_open_message_smb(
64 struct smbd_server_connection *sconn, uint64_t mid);
65 static bool smb_splice_chain(uint8_t **poutbuf, const uint8_t *andx_buf);
66
67 static void smbd_echo_init(struct smbXsrv_connection *xconn)
68 {
69 xconn->smb1.echo_handler.trusted_fd = -1;
70 xconn->smb1.echo_handler.socket_lock_fd = -1;
71 #ifdef HAVE_ROBUST_MUTEXES
72 xconn->smb1.echo_handler.socket_mutex = NULL;
73 #endif
74 }
75
76 static bool smbd_echo_active(struct smbXsrv_connection *xconn)
77 {
78 if (xconn->smb1.echo_handler.socket_lock_fd != -1) {
79 return true;
80 }
81
82 #ifdef HAVE_ROBUST_MUTEXES
83 if (xconn->smb1.echo_handler.socket_mutex != NULL) {
84 return true;
85 }
86 #endif
87
88 return false;
89 }
90
91 static bool smbd_lock_socket_internal(struct smbXsrv_connection *xconn)
92 {
93 if (!smbd_echo_active(xconn)) {
94 return true;
95 }
96
97 xconn->smb1.echo_handler.ref_count++;
98
99 if (xconn->smb1.echo_handler.ref_count > 1) {
100 return true;
101 }
102
103 DEBUG(10,("pid[%d] wait for socket lock\n", (int)getpid()));
104
105 #ifdef HAVE_ROBUST_MUTEXES
106 if (xconn->smb1.echo_handler.socket_mutex != NULL) {
107 int ret = EINTR;
108
109 while (ret == EINTR) {
110 ret = pthread_mutex_lock(
111 xconn->smb1.echo_handler.socket_mutex);
112 if (ret == 0) {
113 break;
114 }
115 }
116 if (ret != 0) {
117 DEBUG(1, ("pthread_mutex_lock failed: %s\n",
118 strerror(ret)));
119 return false;
120 }
121 }
122 #endif
123
124 if (xconn->smb1.echo_handler.socket_lock_fd != -1) {
125 bool ok;
126
127 do {
128 ok = fcntl_lock(
129 xconn->smb1.echo_handler.socket_lock_fd,
130 F_SETLKW, 0, 0, F_WRLCK);
131 } while (!ok && (errno == EINTR));
132
133 if (!ok) {
134 DEBUG(1, ("fcntl_lock failed: %s\n", strerror(errno)));
135 return false;
136 }
137 }
138
139 DEBUG(10,("pid[%d] got socket lock\n", (int)getpid()));
140
141 return true;
142 }
143
144 void smbd_lock_socket(struct smbXsrv_connection *xconn)
145 {
146 if (!smbd_lock_socket_internal(xconn)) {
147 exit_server_cleanly("failed to lock socket");
148 }
149 }
150
151 static bool smbd_unlock_socket_internal(struct smbXsrv_connection *xconn)
152 {
153 if (!smbd_echo_active(xconn)) {
154 return true;
155 }
156
157 xconn->smb1.echo_handler.ref_count--;
158
159 if (xconn->smb1.echo_handler.ref_count > 0) {
160 return true;
161 }
162
163 #ifdef HAVE_ROBUST_MUTEXES
164 if (xconn->smb1.echo_handler.socket_mutex != NULL) {
165 int ret = EINTR;
166
167 while (ret == EINTR) {
168 ret = pthread_mutex_unlock(
169 xconn->smb1.echo_handler.socket_mutex);
170 if (ret == 0) {
171 break;
172 }
173 }
174 if (ret != 0) {
175 DEBUG(1, ("pthread_mutex_unlock failed: %s\n",
176 strerror(ret)));
177 return false;
178 }
179 }
180 #endif
181
182 if (xconn->smb1.echo_handler.socket_lock_fd != -1) {
183 bool ok;
184
185 do {
186 ok = fcntl_lock(
187 xconn->smb1.echo_handler.socket_lock_fd,
188 F_SETLKW, 0, 0, F_UNLCK);
189 } while (!ok && (errno == EINTR));
190
191 if (!ok) {
192 DEBUG(1, ("fcntl_lock failed: %s\n", strerror(errno)));
193 return false;
194 }
195 }
196
197 DEBUG(10,("pid[%d] unlocked socket\n", (int)getpid()));
198
199 return true;
200 }
201
202 void smbd_unlock_socket(struct smbXsrv_connection *xconn)
203 {
204 if (!smbd_unlock_socket_internal(xconn)) {
205 exit_server_cleanly("failed to unlock socket");
206 }
207 }
208
209 /* Accessor function for smb_read_error for smbd functions. */
210
211 /****************************************************************************
212 Send an smb to a fd.
213 ****************************************************************************/
214
215 bool srv_send_smb(struct smbXsrv_connection *xconn, char *buffer,
216 bool do_signing, uint32_t seqnum,
217 bool do_encrypt,
218 struct smb_perfcount_data *pcd)
219 {
220 size_t len = 0;
221 ssize_t ret;
222 char *buf_out = buffer;
223
224 if (!NT_STATUS_IS_OK(xconn->transport.status)) {
225 /*
226 * we're not supposed to do any io
227 */
228 return true;
229 }
230
231 smbd_lock_socket(xconn);
232
233 if (do_signing) {
234 /* Sign the outgoing packet if required. */
235 srv_calculate_sign_mac(xconn, buf_out, seqnum);
236 }
237
238 if (do_encrypt) {
239 NTSTATUS status = srv_encrypt_buffer(xconn, buffer, &buf_out);
240 if (!NT_STATUS_IS_OK(status)) {
241 DEBUG(0, ("send_smb: SMB encryption failed "
242 "on outgoing packet! Error %s\n",
243 nt_errstr(status) ));
244 ret = -1;
245 goto out;
246 }
247 }
248
249 len = smb_len_large(buf_out) + 4;
250
251 ret = write_data(xconn->transport.sock, buf_out, len);
252 if (ret <= 0) {
253 int saved_errno = errno;
254 /*
255 * Try and give an error message saying what
256 * client failed.
257 */
258 DEBUG(1,("pid[%d] Error writing %d bytes to client %s. %d. (%s)\n",
259 (int)getpid(), (int)len,
260 smbXsrv_connection_dbg(xconn),
261 (int)ret, strerror(saved_errno)));
262 errno = saved_errno;
263
264 srv_free_enc_buffer(xconn, buf_out);
265 goto out;
266 }
267
268 SMB_PERFCOUNT_SET_MSGLEN_OUT(pcd, len);
269 srv_free_enc_buffer(xconn, buf_out);
270 out:
271 SMB_PERFCOUNT_END(pcd);
272
273 smbd_unlock_socket(xconn);
274 return (ret > 0);
275 }
276
277 /*******************************************************************
278 Setup the word count and byte count for a smb message.
279 ********************************************************************/
280
281 int srv_set_message(char *buf,
282 int num_words,
283 int num_bytes,
284 bool zero)
285 {
286 if (zero && (num_words || num_bytes)) {
287 memset(buf + smb_size,'\0',num_words*2 + num_bytes);
288 }
289 SCVAL(buf,smb_wct,num_words);
290 SSVAL(buf,smb_vwv + num_words*SIZEOFWORD,num_bytes);
291 smb_setlen(buf,(smb_size + num_words*2 + num_bytes - 4));
292 return (smb_size + num_words*2 + num_bytes);
293 }
294
295 static bool valid_smb_header(const uint8_t *inbuf)
296 {
297 if (is_encrypted_packet(inbuf)) {
298 return true;
299 }
300 /*
301 * This used to be (strncmp(smb_base(inbuf),"\377SMB",4) == 0)
302 * but it just looks weird to call strncmp for this one.
303 */
304 return (IVAL(smb_base(inbuf), 0) == 0x424D53FF);
305 }
306
307 /* Socket functions for smbd packet processing. */
308
309 static bool valid_packet_size(size_t len)
310 {
311 /*
312 * A WRITEX with CAP_LARGE_WRITEX can be 64k worth of data plus 65 bytes
313 * of header. Don't print the error if this fits.... JRA.
314 */
315
316 if (len > (LARGE_WRITEX_BUFFER_SIZE + LARGE_WRITEX_HDR_SIZE)) {
317 DEBUG(0,("Invalid packet length! (%lu bytes).\n",
318 (unsigned long)len));
319 return false;
320 }
321 return true;
322 }
323
324 static NTSTATUS read_packet_remainder(int fd, char *buffer,
325 unsigned int timeout, ssize_t len)
326 {
327 NTSTATUS status;
328
329 if (len <= 0) {
330 return NT_STATUS_OK;
331 }
332
333 status = read_fd_with_timeout(fd, buffer, len, len, timeout, NULL);
334 if (!NT_STATUS_IS_OK(status)) {
335 char addr[INET6_ADDRSTRLEN];
336 DEBUG(0, ("read_fd_with_timeout failed for client %s read "
337 "error = %s.\n",
338 get_peer_addr(fd, addr, sizeof(addr)),
339 nt_errstr(status)));
340 }
341 return status;
342 }
343
344 /****************************************************************************
345 Attempt a zerocopy writeX read. We know here that len > smb_size-4
346 ****************************************************************************/
347
348 /*
349 * Unfortunately, earlier versions of smbclient/libsmbclient
350 * don't send this "standard" writeX header. I've fixed this
351 * for 3.2 but we'll use the old method with earlier versions.
352 * Windows and CIFSFS at least use this standard size. Not
353 * sure about MacOSX.
354 */
355
356 #define STANDARD_WRITE_AND_X_HEADER_SIZE (smb_size - 4 + /* basic header */ \
357 (2*14) + /* word count (including bcc) */ \
358 1 /* pad byte */)
359
360 static NTSTATUS receive_smb_raw_talloc_partial_read(TALLOC_CTX *mem_ctx,
361 const char lenbuf[4],
362 struct smbXsrv_connection *xconn,
363 int sock,
364 char **buffer,
365 unsigned int timeout,
366 size_t *p_unread,
367 size_t *len_ret)
368 {
369 /* Size of a WRITEX call (+4 byte len). */
370 char writeX_header[4 + STANDARD_WRITE_AND_X_HEADER_SIZE];
371 ssize_t len = smb_len_large(lenbuf); /* Could be a UNIX large writeX. */
372 ssize_t toread;
373 NTSTATUS status;
374
375 memcpy(writeX_header, lenbuf, 4);
376
377 status = read_fd_with_timeout(
378 sock, writeX_header + 4,
379 STANDARD_WRITE_AND_X_HEADER_SIZE,
380 STANDARD_WRITE_AND_X_HEADER_SIZE,
381 timeout, NULL);
382
383 if (!NT_STATUS_IS_OK(status)) {
384 DEBUG(0, ("read_fd_with_timeout failed for client %s read "
385 "error = %s.\n",
386 smbXsrv_connection_dbg(xconn),
387 nt_errstr(status)));
388 return status;
389 }
390
391 /*
392 * Ok - now try and see if this is a possible
393 * valid writeX call.
394 */
395
396 if (is_valid_writeX_buffer(xconn, (uint8_t *)writeX_header)) {
397 /*
398 * If the data offset is beyond what
399 * we've read, drain the extra bytes.
400 */
401 uint16_t doff = SVAL(writeX_header,smb_vwv11);
402 ssize_t newlen;
403
404 if (doff > STANDARD_WRITE_AND_X_HEADER_SIZE) {
405 size_t drain = doff - STANDARD_WRITE_AND_X_HEADER_SIZE;
406 if (drain_socket(sock, drain) != drain) {
407 smb_panic("receive_smb_raw_talloc_partial_read:"
408 " failed to drain pending bytes");
409 }
410 } else {
411 doff = STANDARD_WRITE_AND_X_HEADER_SIZE;
412 }
413
414 /* Spoof down the length and null out the bcc. */
415 set_message_bcc(writeX_header, 0);
416 newlen = smb_len(writeX_header);
417
418 /* Copy the header we've written. */
419
420 *buffer = (char *)talloc_memdup(mem_ctx,
421 writeX_header,
422 sizeof(writeX_header));
423
424 if (*buffer == NULL) {
425 DEBUG(0, ("Could not allocate inbuf of length %d\n",
426 (int)sizeof(writeX_header)));
427 return NT_STATUS_NO_MEMORY;
428 }
429
430 /* Work out the remaining bytes. */
431 *p_unread = len - STANDARD_WRITE_AND_X_HEADER_SIZE;
432 *len_ret = newlen + 4;
433 return NT_STATUS_OK;
434 }
435
436 if (!valid_packet_size(len)) {
437 return NT_STATUS_INVALID_PARAMETER;
438 }
439
440 /*
441 * Not a valid writeX call. Just do the standard
442 * talloc and return.
443 */
444
445 *buffer = talloc_array(mem_ctx, char, len+4);
446
447 if (*buffer == NULL) {
448 DEBUG(0, ("Could not allocate inbuf of length %d\n",
449 (int)len+4));
450 return NT_STATUS_NO_MEMORY;
451 }
452
453 /* Copy in what we already read. */
454 memcpy(*buffer,
455 writeX_header,
456 4 + STANDARD_WRITE_AND_X_HEADER_SIZE);
457 toread = len - STANDARD_WRITE_AND_X_HEADER_SIZE;
458
459 if(toread > 0) {
460 status = read_packet_remainder(
461 sock,
462 (*buffer) + 4 + STANDARD_WRITE_AND_X_HEADER_SIZE,
463 timeout, toread);
464
465 if (!NT_STATUS_IS_OK(status)) {
466 DEBUG(10, ("receive_smb_raw_talloc_partial_read: %s\n",
467 nt_errstr(status)));
468 return status;
469 }
470 }
471
472 *len_ret = len + 4;
473 return NT_STATUS_OK;
474 }
475
476 static NTSTATUS receive_smb_raw_talloc(TALLOC_CTX *mem_ctx,
477 struct smbXsrv_connection *xconn,
478 int sock,
479 char **buffer, unsigned int timeout,
480 size_t *p_unread, size_t *plen)
481 {
482 char lenbuf[4];
483 size_t len;
484 int min_recv_size = lp_min_receive_file_size();
485 NTSTATUS status;
486
487 *p_unread = 0;
488
489 status = read_smb_length_return_keepalive(sock, lenbuf, timeout,
490 &len);
491 if (!NT_STATUS_IS_OK(status)) {
492 return status;
493 }
494
495 if (CVAL(lenbuf,0) == 0 && min_recv_size &&
496 (smb_len_large(lenbuf) > /* Could be a UNIX large writeX. */
497 (min_recv_size + STANDARD_WRITE_AND_X_HEADER_SIZE)) &&
498 !srv_is_signing_active(xconn) &&
499 xconn->smb1.echo_handler.trusted_fde == NULL) {
500
501 return receive_smb_raw_talloc_partial_read(
502 mem_ctx, lenbuf, xconn, sock, buffer, timeout,
503 p_unread, plen);
504 }
505
506 if (!valid_packet_size(len)) {
507 return NT_STATUS_INVALID_PARAMETER;
508 }
509
510 /*
511 * The +4 here can't wrap, we've checked the length above already.
512 */
513
514 *buffer = talloc_array(mem_ctx, char, len+4);
515
516 if (*buffer == NULL) {
517 DEBUG(0, ("Could not allocate inbuf of length %d\n",
518 (int)len+4));
519 return NT_STATUS_NO_MEMORY;
520 }
521
522 memcpy(*buffer, lenbuf, sizeof(lenbuf));
523
524 status = read_packet_remainder(sock, (*buffer)+4, timeout, len);
525 if (!NT_STATUS_IS_OK(status)) {
526 return status;
527 }
528
529 *plen = len + 4;
530 return NT_STATUS_OK;
531 }
532
533 static NTSTATUS receive_smb_talloc(TALLOC_CTX *mem_ctx,
534 struct smbXsrv_connection *xconn,
535 int sock,
536 char **buffer, unsigned int timeout,
537 size_t *p_unread, bool *p_encrypted,
538 size_t *p_len,
539 uint32_t *seqnum,
540 bool trusted_channel)
541 {
542 size_t len = 0;
543 NTSTATUS status;
544
545 *p_encrypted = false;
546
547 status = receive_smb_raw_talloc(mem_ctx, xconn, sock, buffer, timeout,
548 p_unread, &len);
549 if (!NT_STATUS_IS_OK(status)) {
550 DEBUG(NT_STATUS_EQUAL(status, NT_STATUS_END_OF_FILE)?5:1,
551 ("receive_smb_raw_talloc failed for client %s "
552 "read error = %s.\n",
553 smbXsrv_connection_dbg(xconn),
554 nt_errstr(status)) );
555 return status;
556 }
557
558 if (is_encrypted_packet((uint8_t *)*buffer)) {
559 status = srv_decrypt_buffer(xconn, *buffer);
560 if (!NT_STATUS_IS_OK(status)) {
561 DEBUG(0, ("receive_smb_talloc: SMB decryption failed on "
562 "incoming packet! Error %s\n",
563 nt_errstr(status) ));
564 return status;
565 }
566 *p_encrypted = true;
567 }
568
569 /* Check the incoming SMB signature. */
570 if (!srv_check_sign_mac(xconn, *buffer, seqnum, trusted_channel)) {
571 DEBUG(0, ("receive_smb: SMB Signature verification failed on "
572 "incoming packet!\n"));
573 return NT_STATUS_INVALID_NETWORK_RESPONSE;
574 }
575
576 *p_len = len;
577 return NT_STATUS_OK;
578 }
579
580 /*
581 * Initialize a struct smb_request from an inbuf
582 */
583
584 static bool init_smb_request(struct smb_request *req,
585 struct smbd_server_connection *sconn,
586 struct smbXsrv_connection *xconn,
587 const uint8_t *inbuf,
588 size_t unread_bytes, bool encrypted,
589 uint32_t seqnum)
590 {
591 struct smbXsrv_tcon *tcon;
592 NTSTATUS status;
593 NTTIME now;
594 size_t req_size = smb_len(inbuf) + 4;
595
596 /* Ensure we have at least smb_size bytes. */
597 if (req_size < smb_size) {
598 DEBUG(0,("init_smb_request: invalid request size %u\n",
599 (unsigned int)req_size ));
600 return false;
601 }
602
603 req->request_time = timeval_current();
604 now = timeval_to_nttime(&req->request_time);
605
606 req->cmd = CVAL(inbuf, smb_com);
607 req->flags2 = SVAL(inbuf, smb_flg2);
608 req->smbpid = SVAL(inbuf, smb_pid);
609 req->mid = (uint64_t)SVAL(inbuf, smb_mid);
610 req->seqnum = seqnum;
611 req->vuid = SVAL(inbuf, smb_uid);
612 req->tid = SVAL(inbuf, smb_tid);
613 req->wct = CVAL(inbuf, smb_wct);
614 req->vwv = (const uint16_t *)(inbuf+smb_vwv);
615 req->buflen = smb_buflen(inbuf);
616 req->buf = (const uint8_t *)smb_buf_const(inbuf);
617 req->unread_bytes = unread_bytes;
618 req->encrypted = encrypted;
619 req->sconn = sconn;
620 req->xconn = xconn;
621 req->conn = NULL;
622 if (xconn != NULL) {
623 status = smb1srv_tcon_lookup(xconn, req->tid, now, &tcon);
624 if (NT_STATUS_IS_OK(status)) {
625 req->conn = tcon->compat;
626 }
627 }
628 req->chain_fsp = NULL;
629 req->smb2req = NULL;
630 req->priv_paths = NULL;
631 req->chain = NULL;
632 smb_init_perfcount_data(&req->pcd);
633
634 /* Ensure we have at least wct words and 2 bytes of bcc. */
635 if (smb_size + req->wct*2 > req_size) {
636 DEBUG(0,("init_smb_request: invalid wct number %u (size %u)\n",
637 (unsigned int)req->wct,
638 (unsigned int)req_size));
639 return false;
640 }
641 /* Ensure bcc is correct. */
642 if (((const uint8_t *)smb_buf_const(inbuf)) + req->buflen > inbuf + req_size) {
643 DEBUG(0,("init_smb_request: invalid bcc number %u "
644 "(wct = %u, size %u)\n",
645 (unsigned int)req->buflen,
646 (unsigned int)req->wct,
647 (unsigned int)req_size));
648 return false;
649 }
650
651 req->outbuf = NULL;
652 return true;
653 }
654
655 static void process_smb(struct smbXsrv_connection *xconn,
656 uint8_t *inbuf, size_t nread, size_t unread_bytes,
657 uint32_t seqnum, bool encrypted,
658 struct smb_perfcount_data *deferred_pcd);
659
660 static void smbd_deferred_open_timer(struct tevent_context *ev,
661 struct tevent_timer *te,
662 struct timeval _tval,
663 void *private_data)
664 {
665 struct pending_message_list *msg = talloc_get_type(private_data,
666 struct pending_message_list);
667 struct smbd_server_connection *sconn = msg->sconn;
668 struct smbXsrv_connection *xconn = msg->xconn;
669 TALLOC_CTX *mem_ctx = talloc_tos();
670 uint64_t mid = (uint64_t)SVAL(msg->buf.data,smb_mid);
671 uint8_t *inbuf;
672
673 inbuf = (uint8_t *)talloc_memdup(mem_ctx, msg->buf.data,
674 msg->buf.length);
675 if (inbuf == NULL) {
676 exit_server("smbd_deferred_open_timer: talloc failed\n");
677 return;
678 }
679
680 /* We leave this message on the queue so the open code can
681 know this is a retry. */
682 DEBUG(5,("smbd_deferred_open_timer: trigger mid %llu.\n",
683 (unsigned long long)mid ));
684
685 /* Mark the message as processed so this is not
686 * re-processed in error. */
687 msg->processed = true;
688
689 process_smb(xconn, inbuf,
690 msg->buf.length, 0,
691 msg->seqnum, msg->encrypted, &msg->pcd);
692
693 /* If it's still there and was processed, remove it. */
694 msg = get_deferred_open_message_smb(sconn, mid);
695 if (msg && msg->processed) {
696 remove_deferred_open_message_smb(xconn, mid);
697 }
698 }
699
700 /****************************************************************************
701 Function to push a message onto the tail of a linked list of smb messages ready
702 for processing.
703 ****************************************************************************/
704
705 static bool push_queued_message(struct smb_request *req,
706 struct timeval request_time,
707 struct timeval end_time,
708 struct deferred_open_record *open_rec)
709 {
710 int msg_len = smb_len(req->inbuf) + 4;
711 struct pending_message_list *msg;
712
713 msg = talloc_zero(NULL, struct pending_message_list);
714
715 if(msg == NULL) {
716 DEBUG(0,("push_message: malloc fail (1)\n"));
717 return False;
718 }
719 msg->sconn = req->sconn;
720 msg->xconn = req->xconn;
721
722 msg->buf = data_blob_talloc(msg, req->inbuf, msg_len);
723 if(msg->buf.data == NULL) {
724 DEBUG(0,("push_message: malloc fail (2)\n"));
725 TALLOC_FREE(msg);
726 return False;
727 }
728
729 msg->request_time = request_time;
730 msg->seqnum = req->seqnum;
731 msg->encrypted = req->encrypted;
732 msg->processed = false;
733 SMB_PERFCOUNT_DEFER_OP(&req->pcd, &msg->pcd);
734
735 if (open_rec) {
736 msg->open_rec = talloc_move(msg, &open_rec);
737 }
738
739 #if 0
740 msg->te = tevent_add_timer(msg->sconn->ev_ctx,
741 msg,
742 end_time,
743 smbd_deferred_open_timer,
744 msg);
745 if (!msg->te) {
746 DEBUG(0,("push_message: event_add_timed failed\n"));
747 TALLOC_FREE(msg);
748 return false;
749 }
750 #endif
751
752 DLIST_ADD_END(req->sconn->deferred_open_queue, msg,
753 struct pending_message_list *);
754
755 DEBUG(10,("push_message: pushed message length %u on "
756 "deferred_open_queue\n", (unsigned int)msg_len));
757
758 return True;
759 }
760
761 /****************************************************************************
762 Function to delete a sharing violation open message by mid.
763 ****************************************************************************/
764
765 void remove_deferred_open_message_smb(struct smbXsrv_connection *xconn,
766 uint64_t mid)
767 {
768 struct smbd_server_connection *sconn = xconn->client->sconn;
769 struct pending_message_list *pml;
770
771 if (sconn->using_smb2) {
772 remove_deferred_open_message_smb2(xconn, mid);
773 return;
774 }
775
776 for (pml = sconn->deferred_open_queue; pml; pml = pml->next) {
777 if (mid == (uint64_t)SVAL(pml->buf.data,smb_mid)) {
778 DEBUG(10,("remove_deferred_open_message_smb: "
779 "deleting mid %llu len %u\n",
780 (unsigned long long)mid,
781 (unsigned int)pml->buf.length ));
782 DLIST_REMOVE(sconn->deferred_open_queue, pml);
783 TALLOC_FREE(pml);
784 return;
785 }
786 }
787 }
788
789 /****************************************************************************
790 Move a sharing violation open retry message to the front of the list and
791 schedule it for immediate processing.
792 ****************************************************************************/
793
794 bool schedule_deferred_open_message_smb(struct smbXsrv_connection *xconn,
795 uint64_t mid)
796 {
797 struct smbd_server_connection *sconn = xconn->client->sconn;
798 struct pending_message_list *pml;
799 int i = 0;
800
801 if (sconn->using_smb2) {
802 return schedule_deferred_open_message_smb2(xconn, mid);
803 }
804
805 for (pml = sconn->deferred_open_queue; pml; pml = pml->next) {
806 uint64_t msg_mid = (uint64_t)SVAL(pml->buf.data,smb_mid);
807
808 DEBUG(10,("schedule_deferred_open_message_smb: [%d] "
809 "msg_mid = %llu\n",
810 i++,
811 (unsigned long long)msg_mid ));
812
813 if (mid == msg_mid) {
814 struct tevent_timer *te;
815
816 if (pml->processed) {
817 /* A processed message should not be
818 * rescheduled. */
819 DEBUG(0,("schedule_deferred_open_message_smb: LOGIC ERROR "
820 "message mid %llu was already processed\n",
821 (unsigned long long)msg_mid ));
822 continue;
823 }
824
825 DEBUG(10,("schedule_deferred_open_message_smb: "
826 "scheduling mid %llu\n",
827 (unsigned long long)mid ));
828
829 te = tevent_add_timer(pml->sconn->ev_ctx,
830 pml,
831 timeval_zero(),
832 smbd_deferred_open_timer,
833 pml);
834 if (!te) {
835 DEBUG(10,("schedule_deferred_open_message_smb: "
836 "event_add_timed() failed, "
837 "skipping mid %llu\n",
838 (unsigned long long)msg_mid ));
839 }
840
841 TALLOC_FREE(pml->te);
842 pml->te = te;
843 DLIST_PROMOTE(sconn->deferred_open_queue, pml);
844 return true;
845 }
846 }
847
848 DEBUG(10,("schedule_deferred_open_message_smb: failed to "
849 "find message mid %llu\n",
850 (unsigned long long)mid ));
851
852 return false;
853 }
854
855 /****************************************************************************
856 Return true if this mid is on the deferred queue and was not yet processed.
857 ****************************************************************************/
858
859 bool open_was_deferred(struct smbXsrv_connection *xconn, uint64_t mid)
860 {
861 struct smbd_server_connection *sconn = xconn->client->sconn;
862 struct pending_message_list *pml;
863
864 if (sconn->using_smb2) {
865 return open_was_deferred_smb2(xconn, mid);
866 }
867
868 for (pml = sconn->deferred_open_queue; pml; pml = pml->next) {
869 if (((uint64_t)SVAL(pml->buf.data,smb_mid)) == mid && !pml->processed) {
870 return True;
871 }
872 }
873 return False;
874 }
875
876 /****************************************************************************
877 Return the message queued by this mid.
878 ****************************************************************************/
879
880 static struct pending_message_list *get_deferred_open_message_smb(
881 struct smbd_server_connection *sconn, uint64_t mid)
882 {
883 struct pending_message_list *pml;
884
885 for (pml = sconn->deferred_open_queue; pml; pml = pml->next) {
886 if (((uint64_t)SVAL(pml->buf.data,smb_mid)) == mid) {
887 return pml;
888 }
889 }
890 return NULL;
891 }
892
893 /****************************************************************************
894 Get the state data queued by this mid.
895 ****************************************************************************/
896
897 bool get_deferred_open_message_state(struct smb_request *smbreq,
898 struct timeval *p_request_time,
899 struct deferred_open_record **open_rec)
900 {
901 struct pending_message_list *pml;
902
903 if (smbreq->sconn->using_smb2) {
904 return get_deferred_open_message_state_smb2(smbreq->smb2req,
905 p_request_time,
906 open_rec);
907 }
908
909 pml = get_deferred_open_message_smb(smbreq->sconn, smbreq->mid);
910 if (!pml) {
911 return false;
912 }
913 if (p_request_time) {
914 *p_request_time = pml->request_time;
915 }
916 if (open_rec != NULL) {
917 *open_rec = pml->open_rec;
918 }
919 return true;
920 }
921
922 /****************************************************************************
923 Function to push a deferred open smb message onto a linked list of local smb
924 messages ready for processing.
925 ****************************************************************************/
926
927 bool push_deferred_open_message_smb(struct smb_request *req,
928 struct timeval request_time,
929 struct timeval timeout,
930 struct file_id id,
931 struct deferred_open_record *open_rec)
932 {
933 struct timeval end_time;
934
935 if (req->smb2req) {
936 return push_deferred_open_message_smb2(req->smb2req,
937 request_time,
938 timeout,
939 id,
940 open_rec);
941 }
942
943 if (req->unread_bytes) {
944 DEBUG(0,("push_deferred_open_message_smb: logic error ! "
945 "unread_bytes = %u\n",
946 (unsigned int)req->unread_bytes ));
947 smb_panic("push_deferred_open_message_smb: "
948 "logic error unread_bytes != 0" );
949 }
950
951 end_time = timeval_sum(&request_time, &timeout);
952
953 DEBUG(10,("push_deferred_open_message_smb: pushing message "
954 "len %u mid %llu timeout time [%u.%06u]\n",
955 (unsigned int) smb_len(req->inbuf)+4,
956 (unsigned long long)req->mid,
957 (unsigned int)end_time.tv_sec,
958 (unsigned int)end_time.tv_usec));
959
960 return push_queued_message(req, request_time, end_time, open_rec);
961 }
962
963 static void smbd_sig_term_handler(struct tevent_context *ev,
964 struct tevent_signal *se,
965 int signum,
966 int count,
967 void *siginfo,
968 void *private_data)
969 {
970 exit_server_cleanly("termination signal");
971 }
972
973 void smbd_setup_sig_term_handler(struct smbd_server_connection *sconn)
974 {
975 struct tevent_signal *se;
976
977 se = tevent_add_signal(sconn->ev_ctx,
978 sconn,
979 SIGTERM, 0,
980 smbd_sig_term_handler,
981 sconn);
982 if (!se) {
983 exit_server("failed to setup SIGTERM handler");
984 }
985 }
986
987 static void smbd_sig_hup_handler(struct tevent_context *ev,
988 struct tevent_signal *se,
989 int signum,
990 int count,
991 void *siginfo,
992 void *private_data)
993 {
994 struct smbd_server_connection *sconn =
995 talloc_get_type_abort(private_data,
996 struct smbd_server_connection);
997
998 change_to_root_user();
999 DEBUG(1,("Reloading services after SIGHUP\n"));
1000 reload_services(sconn, conn_snum_used, false);
1001 }
1002
1003 void smbd_setup_sig_hup_handler(struct smbd_server_connection *sconn)
1004 {
1005 struct tevent_signal *se;
1006
1007 se = tevent_add_signal(sconn->ev_ctx,
1008 sconn,
1009 SIGHUP, 0,
1010 smbd_sig_hup_handler,
1011 sconn);
1012 if (!se) {
1013 exit_server("failed to setup SIGHUP handler");
1014 }
1015 }
1016
1017 static void smbd_conf_updated(struct messaging_context *msg,
1018 void *private_data,
1019 uint32_t msg_type,
1020 struct server_id server_id,
1021 DATA_BLOB *data)
1022 {
1023 struct smbd_server_connection *sconn =
1024 talloc_get_type_abort(private_data,
1025 struct smbd_server_connection);
1026
1027 DEBUG(10,("smbd_conf_updated: Got message saying smb.conf was "
1028 "updated. Reloading.\n"));
1029 change_to_root_user();
1030 reload_services(sconn, conn_snum_used, false);
1031 }
1032
1033 /*
1034 * Only allow 5 outstanding trans requests. We're allocating memory, so
1035 * prevent a DoS.
1036 */
1037
1038 NTSTATUS allow_new_trans(struct trans_state *list, uint64_t mid)
1039 {
1040 int count = 0;
1041 for (; list != NULL; list = list->next) {
1042
1043 if (list->mid == mid) {
1044 return NT_STATUS_INVALID_PARAMETER;
1045 }
1046
1047 count += 1;
1048 }
1049 if (count > 5) {
1050 return NT_STATUS_INSUFFICIENT_RESOURCES;
1051 }
1052
1053 return NT_STATUS_OK;
1054 }
1055
1056 /*
1057 These flags determine some of the permissions required to do an operation
1058
1059 Note that I don't set NEED_WRITE on some write operations because they
1060 are used by some brain-dead clients when printing, and I don't want to
1061 force write permissions on print services.
1062 */
1063 #define AS_USER (1<<0)
1064 #define NEED_WRITE (1<<1) /* Must be paired with AS_USER */
1065 #define TIME_INIT (1<<2)
1066 #define CAN_IPC (1<<3) /* Must be paired with AS_USER */
1067 #define AS_GUEST (1<<5) /* Must *NOT* be paired with AS_USER */
1068 #define DO_CHDIR (1<<6)
1069
1070 /*
1071 define a list of possible SMB messages and their corresponding
1072 functions. Any message that has a NULL function is unimplemented -
1073 please feel free to contribute implementations!
1074 */
1075 static const struct smb_message_struct {
1076 const char *name;
1077 void (*fn)(struct smb_request *req);
1078 int flags;
1079 } smb_messages[256] = {
1080
1081 /* 0x00 */ { "SMBmkdir",reply_mkdir,AS_USER | NEED_WRITE},
1082 /* 0x01 */ { "SMBrmdir",reply_rmdir,AS_USER | NEED_WRITE},
1083 /* 0x02 */ { "SMBopen",reply_open,AS_USER },
1084 /* 0x03 */ { "SMBcreate",reply_mknew,AS_USER},
1085 /* 0x04 */ { "SMBclose",reply_close,AS_USER | CAN_IPC },
1086 /* 0x05 */ { "SMBflush",reply_flush,AS_USER},
1087 /* 0x06 */ { "SMBunlink",reply_unlink,AS_USER | NEED_WRITE },
1088 /* 0x07 */ { "SMBmv",reply_mv,AS_USER | NEED_WRITE },
1089 /* 0x08 */ { "SMBgetatr",reply_getatr,AS_USER},
1090 /* 0x09 */ { "SMBsetatr",reply_setatr,AS_USER | NEED_WRITE},
1091 /* 0x0a */ { "SMBread",reply_read,AS_USER},
1092 /* 0x0b */ { "SMBwrite",reply_write,AS_USER | CAN_IPC },
1093 /* 0x0c */ { "SMBlock",reply_lock,AS_USER},
1094 /* 0x0d */ { "SMBunlock",reply_unlock,AS_USER},
1095 /* 0x0e */ { "SMBctemp",reply_ctemp,AS_USER },
1096 /* 0x0f */ { "SMBmknew",reply_mknew,AS_USER},
1097 /* 0x10 */ { "SMBcheckpath",reply_checkpath,AS_USER},
1098 /* 0x11 */ { "SMBexit",reply_exit,DO_CHDIR},
1099 /* 0x12 */ { "SMBlseek",reply_lseek,AS_USER},
1100 /* 0x13 */ { "SMBlockread",reply_lockread,AS_USER},
1101 /* 0x14 */ { "SMBwriteunlock",reply_writeunlock,AS_USER},
1102 /* 0x15 */ { NULL, NULL, 0 },
1103 /* 0x16 */ { NULL, NULL, 0 },
1104 /* 0x17 */ { NULL, NULL, 0 },
1105 /* 0x18 */ { NULL, NULL, 0 },
1106 /* 0x19 */ { NULL, NULL, 0 },
1107 /* 0x1a */ { "SMBreadbraw",reply_readbraw,AS_USER},
1108 /* 0x1b */ { "SMBreadBmpx",reply_readbmpx,AS_USER},
1109 /* 0x1c */ { "SMBreadBs",reply_readbs,AS_USER },
1110 /* 0x1d */ { "SMBwritebraw",reply_writebraw,AS_USER},
1111 /* 0x1e */ { "SMBwriteBmpx",reply_writebmpx,AS_USER},
1112 /* 0x1f */ { "SMBwriteBs",reply_writebs,AS_USER},
1113 /* 0x20 */ { "SMBwritec", NULL,0},
1114 /* 0x21 */ { NULL, NULL, 0 },
1115 /* 0x22 */ { "SMBsetattrE",reply_setattrE,AS_USER | NEED_WRITE },
1116 /* 0x23 */ { "SMBgetattrE",reply_getattrE,AS_USER },
1117 /* 0x24 */ { "SMBlockingX",reply_lockingX,AS_USER },
1118 /* 0x25 */ { "SMBtrans",reply_trans,AS_USER | CAN_IPC },
1119 /* 0x26 */ { "SMBtranss",reply_transs,AS_USER | CAN_IPC},
1120 /* 0x27 */ { "SMBioctl",reply_ioctl,0},
1121 /* 0x28 */ { "SMBioctls", NULL,AS_USER},
1122 /* 0x29 */ { "SMBcopy",reply_copy,AS_USER | NEED_WRITE },
1123 /* 0x2a */ { "SMBmove", NULL,AS_USER | NEED_WRITE },
1124 /* 0x2b */ { "SMBecho",reply_echo,0},
1125 /* 0x2c */ { "SMBwriteclose",reply_writeclose,AS_USER},
1126 /* 0x2d */ { "SMBopenX",reply_open_and_X,AS_USER | CAN_IPC },
1127 /* 0x2e */ { "SMBreadX",reply_read_and_X,AS_USER | CAN_IPC },
1128 /* 0x2f */ { "SMBwriteX",reply_write_and_X,AS_USER | CAN_IPC },
1129 /* 0x30 */ { NULL, NULL, 0 },
1130 /* 0x31 */ { NULL, NULL, 0 },
1131 /* 0x32 */ { "SMBtrans2",reply_trans2, AS_USER | CAN_IPC },
1132 /* 0x33 */ { "SMBtranss2",reply_transs2, AS_USER | CAN_IPC },
1133 /* 0x34 */ { "SMBfindclose",reply_findclose,AS_USER},
1134 /* 0x35 */ { "SMBfindnclose",reply_findnclose,AS_USER},
1135 /* 0x36 */ { NULL, NULL, 0 },
1136 /* 0x37 */ { NULL, NULL, 0 },
1137 /* 0x38 */ { NULL, NULL, 0 },
1138 /* 0x39 */ { NULL, NULL, 0 },
1139 /* 0x3a */ { NULL, NULL, 0 },
1140 /* 0x3b */ { NULL, NULL, 0 },
1141 /* 0x3c */ { NULL, NULL, 0 },
1142 /* 0x3d */ { NULL, NULL, 0 },
1143 /* 0x3e */ { NULL, NULL, 0 },
1144 /* 0x3f */ { NULL, NULL, 0 },
1145 /* 0x40 */ { NULL, NULL, 0 },
1146 /* 0x41 */ { NULL, NULL, 0 },
1147 /* 0x42 */ { NULL, NULL, 0 },
1148 /* 0x43 */ { NULL, NULL, 0 },
1149 /* 0x44 */ { NULL, NULL, 0 },
1150 /* 0x45 */ { NULL, NULL, 0 },
1151 /* 0x46 */ { NULL, NULL, 0 },
1152 /* 0x47 */ { NULL, NULL, 0 },
1153 /* 0x48 */ { NULL, NULL, 0 },
1154 /* 0x49 */ { NULL, NULL, 0 },
1155 /* 0x4a */ { NULL, NULL, 0 },
1156 /* 0x4b */ { NULL, NULL, 0 },
1157 /* 0x4c */ { NULL, NULL, 0 },
1158 /* 0x4d */ { NULL, NULL, 0 },
1159 /* 0x4e */ { NULL, NULL, 0 },
1160 /* 0x4f */ { NULL, NULL, 0 },
1161 /* 0x50 */ { NULL, NULL, 0 },
1162 /* 0x51 */ { NULL, NULL, 0 },
1163 /* 0x52 */ { NULL, NULL, 0 },
1164 /* 0x53 */ { NULL, NULL, 0 },
1165 /* 0x54 */ { NULL, NULL, 0 },
1166 /* 0x55 */ { NULL, NULL, 0 },
1167 /* 0x56 */ { NULL, NULL, 0 },
1168 /* 0x57 */ { NULL, NULL, 0 },
1169 /* 0x58 */ { NULL, NULL, 0 },
1170 /* 0x59 */ { NULL, NULL, 0 },
1171 /* 0x5a */ { NULL, NULL, 0 },
1172 /* 0x5b */ { NULL, NULL, 0 },
1173 /* 0x5c */ { NULL, NULL, 0 },
1174 /* 0x5d */ { NULL, NULL, 0 },
1175 /* 0x5e */ { NULL, NULL, 0 },
1176 /* 0x5f */ { NULL, NULL, 0 },
1177 /* 0x60 */ { NULL, NULL, 0 },
1178 /* 0x61 */ { NULL, NULL, 0 },
1179 /* 0x62 */ { NULL, NULL, 0 },
1180 /* 0x63 */ { NULL, NULL, 0 },
1181 /* 0x64 */ { NULL, NULL, 0 },
1182 /* 0x65 */ { NULL, NULL, 0 },
1183 /* 0x66 */ { NULL, NULL, 0 },
1184 /* 0x67 */ { NULL, NULL, 0 },
1185 /* 0x68 */ { NULL, NULL, 0 },
1186 /* 0x69 */ { NULL, NULL, 0 },
1187 /* 0x6a */ { NULL, NULL, 0 },
1188 /* 0x6b */ { NULL, NULL, 0 },
1189 /* 0x6c */ { NULL, NULL, 0 },
1190 /* 0x6d */ { NULL, NULL, 0 },
1191 /* 0x6e */ { NULL, NULL, 0 },
1192 /* 0x6f */ { NULL, NULL, 0 },
1193 /* 0x70 */ { "SMBtcon",reply_tcon,0},
1194 /* 0x71 */ { "SMBtdis",reply_tdis,DO_CHDIR},
1195 /* 0x72 */ { "SMBnegprot",reply_negprot,0},
1196 /* 0x73 */ { "SMBsesssetupX",reply_sesssetup_and_X,0},
1197 /* 0x74 */ { "SMBulogoffX",reply_ulogoffX, 0}, /* ulogoff doesn't give a valid TID */
1198 /* 0x75 */ { "SMBtconX",reply_tcon_and_X,0},
1199 /* 0x76 */ { NULL, NULL, 0 },
1200 /* 0x77 */ { NULL, NULL, 0 },
1201 /* 0x78 */ { NULL, NULL, 0 },
1202 /* 0x79 */ { NULL, NULL, 0 },
1203 /* 0x7a */ { NULL, NULL, 0 },
1204 /* 0x7b */ { NULL, NULL, 0 },
1205 /* 0x7c */ { NULL, NULL, 0 },
1206 /* 0x7d */ { NULL, NULL, 0 },
1207 /* 0x7e */ { NULL, NULL, 0 },
1208 /* 0x7f */ { NULL, NULL, 0 },
1209 /* 0x80 */ { "SMBdskattr",reply_dskattr,AS_USER},
1210 /* 0x81 */ { "SMBsearch",reply_search,AS_USER},
1211 /* 0x82 */ { "SMBffirst",reply_search,AS_USER},
1212 /* 0x83 */ { "SMBfunique",reply_search,AS_USER},
1213 /* 0x84 */ { "SMBfclose",reply_fclose,AS_USER},
1214 /* 0x85 */ { NULL, NULL, 0 },
1215 /* 0x86 */ { NULL, NULL, 0 },
1216 /* 0x87 */ { NULL, NULL, 0 },
1217 /* 0x88 */ { NULL, NULL, 0 },
1218 /* 0x89 */ { NULL, NULL, 0 },
1219 /* 0x8a */ { NULL, NULL, 0 },
1220 /* 0x8b */ { NULL, NULL, 0 },
1221 /* 0x8c */ { NULL, NULL, 0 },
1222 /* 0x8d */ { NULL, NULL, 0 },
1223 /* 0x8e */ { NULL, NULL, 0 },
1224 /* 0x8f */ { NULL, NULL, 0 },
1225 /* 0x90 */ { NULL, NULL, 0 },
1226 /* 0x91 */ { NULL, NULL, 0 },
1227 /* 0x92 */ { NULL, NULL, 0 },
1228 /* 0x93 */ { NULL, NULL, 0 },
1229 /* 0x94 */ { NULL, NULL, 0 },
1230 /* 0x95 */ { NULL, NULL, 0 },
1231 /* 0x96 */ { NULL, NULL, 0 },
1232 /* 0x97 */ { NULL, NULL, 0 },
1233 /* 0x98 */ { NULL, NULL, 0 },
1234 /* 0x99 */ { NULL, NULL, 0 },
1235 /* 0x9a */ { NULL, NULL, 0 },
1236 /* 0x9b */ { NULL, NULL, 0 },
1237 /* 0x9c */ { NULL, NULL, 0 },
1238 /* 0x9d */ { NULL, NULL, 0 },
1239 /* 0x9e */ { NULL, NULL, 0 },
1240 /* 0x9f */ { NULL, NULL, 0 },
1241 /* 0xa0 */ { "SMBnttrans",reply_nttrans, AS_USER | CAN_IPC },
1242 /* 0xa1 */ { "SMBnttranss",reply_nttranss, AS_USER | CAN_IPC },
1243 /* 0xa2 */ { "SMBntcreateX",reply_ntcreate_and_X, AS_USER | CAN_IPC },
1244 /* 0xa3 */ { NULL, NULL, 0 },
1245 /* 0xa4 */ { "SMBntcancel",reply_ntcancel, 0 },
1246 /* 0xa5 */ { "SMBntrename",reply_ntrename, AS_USER | NEED_WRITE },
1247 /* 0xa6 */ { NULL, NULL, 0 },
1248 /* 0xa7 */ { NULL, NULL, 0 },
1249 /* 0xa8 */ { NULL, NULL, 0 },
1250 /* 0xa9 */ { NULL, NULL, 0 },
1251 /* 0xaa */ { NULL, NULL, 0 },
1252 /* 0xab */ { NULL, NULL, 0 },
1253 /* 0xac */ { NULL, NULL, 0 },
1254 /* 0xad */ { NULL, NULL, 0 },
1255 /* 0xae */ { NULL, NULL, 0 },
1256 /* 0xaf */ { NULL, NULL, 0 },
1257 /* 0xb0 */ { NULL, NULL, 0 },
1258 /* 0xb1 */ { NULL, NULL, 0 },
1259 /* 0xb2 */ { NULL, NULL, 0 },
1260 /* 0xb3 */ { NULL, NULL, 0 },
1261 /* 0xb4 */ { NULL, NULL, 0 },
1262 /* 0xb5 */ { NULL, NULL, 0 },
1263 /* 0xb6 */ { NULL, NULL, 0 },
1264 /* 0xb7 */ { NULL, NULL, 0 },
1265 /* 0xb8 */ { NULL, NULL, 0 },
1266 /* 0xb9 */ { NULL, NULL, 0 },
1267 /* 0xba */ { NULL, NULL, 0 },
1268 /* 0xbb */ { NULL, NULL, 0 },
1269 /* 0xbc */ { NULL, NULL, 0 },
1270 /* 0xbd */ { NULL, NULL, 0 },
1271 /* 0xbe */ { NULL, NULL, 0 },
1272 /* 0xbf */ { NULL, NULL, 0 },
1273 /* 0xc0 */ { "SMBsplopen",reply_printopen,AS_USER},
1274 /* 0xc1 */ { "SMBsplwr",reply_printwrite,AS_USER},
1275 /* 0xc2 */ { "SMBsplclose",reply_printclose,AS_USER},
1276 /* 0xc3 */ { "SMBsplretq",reply_printqueue,AS_USER},
1277 /* 0xc4 */ { NULL, NULL, 0 },
1278 /* 0xc5 */ { NULL, NULL, 0 },
1279 /* 0xc6 */ { NULL, NULL, 0 },
1280 /* 0xc7 */ { NULL, NULL, 0 },
1281 /* 0xc8 */ { NULL, NULL, 0 },
1282 /* 0xc9 */ { NULL, NULL, 0 },
1283 /* 0xca */ { NULL, NULL, 0 },
1284 /* 0xcb */ { NULL, NULL, 0 },
1285 /* 0xcc */ { NULL, NULL, 0 },
1286 /* 0xcd */ { NULL, NULL, 0 },
1287 /* 0xce */ { NULL, NULL, 0 },
1288 /* 0xcf */ { NULL, NULL, 0 },
1289 /* 0xd0 */ { "SMBsends",reply_sends,AS_GUEST},
1290 /* 0xd1 */ { "SMBsendb", NULL,AS_GUEST},
1291 /* 0xd2 */ { "SMBfwdname", NULL,AS_GUEST},
1292 /* 0xd3 */ { "SMBcancelf", NULL,AS_GUEST},
1293 /* 0xd4 */ { "SMBgetmac", NULL,AS_GUEST},
1294 /* 0xd5 */ { "SMBsendstrt",reply_sendstrt,AS_GUEST},
1295 /* 0xd6 */ { "SMBsendend",reply_sendend,AS_GUEST},
1296 /* 0xd7 */ { "SMBsendtxt",reply_sendtxt,AS_GUEST},
1297 /* 0xd8 */ { NULL, NULL, 0 },
1298 /* 0xd9 */ { NULL, NULL, 0 },
1299 /* 0xda */ { NULL, NULL, 0 },
1300 /* 0xdb */ { NULL, NULL, 0 },
1301 /* 0xdc */ { NULL, NULL, 0 },
1302 /* 0xdd */ { NULL, NULL, 0 },
1303 /* 0xde */ { NULL, NULL, 0 },
1304 /* 0xdf */ { NULL, NULL, 0 },
1305 /* 0xe0 */ { NULL, NULL, 0 },
1306 /* 0xe1 */ { NULL, NULL, 0 },
1307 /* 0xe2 */ { NULL, NULL, 0 },
1308 /* 0xe3 */ { NULL, NULL, 0 },
1309 /* 0xe4 */ { NULL, NULL, 0 },
1310 /* 0xe5 */ { NULL, NULL, 0 },
1311 /* 0xe6 */ { NULL, NULL, 0 },
1312 /* 0xe7 */ { NULL, NULL, 0 },
1313 /* 0xe8 */ { NULL, NULL, 0 },
1314 /* 0xe9 */ { NULL, NULL, 0 },
1315 /* 0xea */ { NULL, NULL, 0 },
1316 /* 0xeb */ { NULL, NULL, 0 },
1317 /* 0xec */ { NULL, NULL, 0 },
1318 /* 0xed */ { NULL, NULL, 0 },
1319 /* 0xee */ { NULL, NULL, 0 },
1320 /* 0xef */ { NULL, NULL, 0 },
1321 /* 0xf0 */ { NULL, NULL, 0 },
1322 /* 0xf1 */ { NULL, NULL, 0 },
1323 /* 0xf2 */ { NULL, NULL, 0 },
1324 /* 0xf3 */ { NULL, NULL, 0 },
1325 /* 0xf4 */ { NULL, NULL, 0 },
1326 /* 0xf5 */ { NULL, NULL, 0 },
1327 /* 0xf6 */ { NULL, NULL, 0 },
1328 /* 0xf7 */ { NULL, NULL, 0 },
1329 /* 0xf8 */ { NULL, NULL, 0 },
1330 /* 0xf9 */ { NULL, NULL, 0 },
1331 /* 0xfa */ { NULL, NULL, 0 },
1332 /* 0xfb */ { NULL, NULL, 0 },
1333 /* 0xfc */ { NULL, NULL, 0 },
1334 /* 0xfd */ { NULL, NULL, 0 },
1335 /* 0xfe */ { NULL, NULL, 0 },
1336 /* 0xff */ { NULL, NULL, 0 }
1337
1338 };
1339
1340 /*******************************************************************
1341 allocate and initialize a reply packet
1342 ********************************************************************/
1343
1344 static bool create_outbuf(TALLOC_CTX *mem_ctx, struct smb_request *req,
1345 const uint8_t *inbuf, char **outbuf,
1346 uint8_t num_words, uint32_t num_bytes)
1347 {
1348 size_t smb_len = MIN_SMB_SIZE + VWV(num_words) + num_bytes;
1349
1350 /*
1351 * Protect against integer wrap.
1352 * The SMB layer reply can be up to 0xFFFFFF bytes.
1353 */
1354 if ((num_bytes > 0xffffff) || (smb_len > 0xffffff)) {
1355 char *msg;
1356 if (asprintf(&msg, "num_bytes too large: %u",
1357 (unsigned)num_bytes) == -1) {
1358 msg = discard_const_p(char, "num_bytes too large");
1359 }
1360 smb_panic(msg);
1361 }
1362
1363 /*
1364 * Here we include the NBT header for now.
1365 */
1366 *outbuf = talloc_array(mem_ctx, char,
1367 NBT_HDR_SIZE + smb_len);
1368 if (*outbuf == NULL) {
1369 return false;
1370 }
1371
1372 construct_reply_common(req->cmd, inbuf, *outbuf);
1373 srv_set_message(*outbuf, num_words, num_bytes, false);
1374 /*
1375 * Zero out the word area, the caller has to take care of the bcc area
1376 * himself
1377 */
1378 if (num_words != 0) {
1379 memset(*outbuf + (NBT_HDR_SIZE + HDR_VWV), 0, VWV(num_words));
1380 }
1381
1382 return true;
1383 }
1384
1385 void reply_outbuf(struct smb_request *req, uint8_t num_words, uint32_t num_bytes)
1386 {
1387 char *outbuf;
1388 if (!create_outbuf(req, req, req->inbuf, &outbuf, num_words,
1389 num_bytes)) {
1390 smb_panic("could not allocate output buffer\n");
1391 }
1392 req->outbuf = (uint8_t *)outbuf;
1393 }
1394
1395
1396 /*******************************************************************
1397 Dump a packet to a file.
1398 ********************************************************************/
1399
1400 static void smb_dump(const char *name, int type, const char *data)
1401 {
1402 size_t len;
1403 int fd, i;
1404 char *fname = NULL;
1405 if (DEBUGLEVEL < 50) {
1406 return;
1407 }
1408
1409 len = smb_len_tcp(data)+4;
1410 for (i=1;i<100;i++) {
1411 fname = talloc_asprintf(talloc_tos(),
1412 "/tmp/%s.%d.%s",
1413 name,
1414 i,
1415 type ? "req" : "resp");
1416 if (fname == NULL) {
1417 return;
1418 }
1419 fd = open(fname, O_WRONLY|O_CREAT|O_EXCL, 0644);
1420 if (fd != -1 || errno != EEXIST) break;
1421 TALLOC_FREE(fname);
1422 }
1423 if (fd != -1) {
1424 ssize_t ret = write(fd, data, len);
1425 if (ret != len)
1426 DEBUG(0,("smb_dump: problem: write returned %d\n", (int)ret ));
1427 close(fd);
1428 DEBUG(0,("created %s len %lu\n", fname, (unsigned long)len));
1429 }
1430 TALLOC_FREE(fname);
1431 }
1432
1433 /****************************************************************************
1434 Prepare everything for calling the actual request function, and potentially
1435 call the request function via the "new" interface.
1436
1437 Return False if the "legacy" function needs to be called, everything is
1438 prepared.
1439
1440 Return True if we're done.
1441
1442 I know this API sucks, but it is the one with the least code change I could
1443 find.
1444 ****************************************************************************/
1445
1446 static connection_struct *switch_message(uint8_t type, struct smb_request *req)
1447 {
1448 int flags;
1449 uint64_t session_tag;
1450 connection_struct *conn = NULL;
1451 struct smbXsrv_connection *xconn = req->xconn;
1452 NTTIME now = timeval_to_nttime(&req->request_time);
1453 struct smbXsrv_session *session = NULL;
1454 NTSTATUS status;
1455
1456 errno = 0;
1457
1458 if (!xconn->smb1.negprot.done) {
1459 switch (type) {
1460 /*
1461 * Without a negprot the request must
1462 * either be a negprot, or one of the
1463 * evil old SMB mailslot messaging types.
1464 */
1465 case SMBnegprot:
1466 case SMBsendstrt:
1467 case SMBsendend:
1468 case SMBsendtxt:
1469 break;
1470 default:
1471 exit_server_cleanly("The first request "
1472 "should be a negprot");
1473 }
1474 }
1475
1476 if (smb_messages[type].fn == NULL) {
1477 DEBUG(0,("Unknown message type %d!\n",type));
1478 smb_dump("Unknown", 1, (const char *)req->inbuf);
1479 reply_unknown_new(req, type);
1480 return NULL;
1481 }
1482
1483 flags = smb_messages[type].flags;
1484
1485 /* In share mode security we must ignore the vuid. */
1486 session_tag = req->vuid;
1487 conn = req->conn;
1488
1489 DEBUG(3,("switch message %s (pid %d) conn 0x%lx\n", smb_fn_name(type),
1490 (int)getpid(), (unsigned long)conn));
1491
1492 smb_dump(smb_fn_name(type), 1, (const char *)req->inbuf);
1493
1494 /* Ensure this value is replaced in the incoming packet. */
1495 SSVAL(discard_const_p(uint8_t, req->inbuf),smb_uid,session_tag);
1496
1497 /*
1498 * Ensure the correct username is in current_user_info. This is a
1499 * really ugly bugfix for problems with multiple session_setup_and_X's
1500 * being done and allowing %U and %G substitutions to work correctly.
1501 * There is a reason this code is done here, don't move it unless you
1502 * know what you're doing... :-).
1503 * JRA.
1504 */
1505
1506 /*
1507 * lookup an existing session
1508 *
1509 * Note: for now we only check for NT_STATUS_NETWORK_SESSION_EXPIRED
1510 * here, the main check is still in change_to_user()
1511 */
1512 status = smb1srv_session_lookup(xconn,
1513 session_tag,
1514 now,
1515 &session);
1516 if (NT_STATUS_EQUAL(status, NT_STATUS_NETWORK_SESSION_EXPIRED)) {
1517 switch (type) {
1518 case SMBsesssetupX:
1519 status = NT_STATUS_OK;
1520 break;
1521 default:
1522 DEBUG(1,("Error: session %llu is expired, mid=%llu.\n",
1523 (unsigned long long)session_tag,
1524 (unsigned long long)req->mid));
1525 reply_nterror(req, NT_STATUS_NETWORK_SESSION_EXPIRED);
1526 return conn;
1527 }
1528 }
1529
1530 if (session_tag != xconn->client->last_session_id) {
1531 struct user_struct *vuser = NULL;
1532
1533 xconn->client->last_session_id = session_tag;
1534 if (session) {
1535 vuser = session->compat;
1536 }
1537 if (vuser) {
1538 set_current_user_info(
1539 vuser->session_info->unix_info->sanitized_username,
1540 vuser->session_info->unix_info->unix_name,
1541 vuser->session_info->info->domain_name);
1542 }
1543 }
1544
1545 /* Does this call need to be run as the connected user? */
1546 if (flags & AS_USER) {
1547
1548 /* Does this call need a valid tree connection? */
1549 if (!conn) {
1550 /*
1551 * Amazingly, the error code depends on the command
1552 * (from Samba4).
1553 */
1554 if (type == SMBntcreateX) {
1555 reply_nterror(req, NT_STATUS_INVALID_HANDLE);
1556 } else {
1557 reply_nterror(req, NT_STATUS_NETWORK_NAME_DELETED);
1558 }
1559 return NULL;
1560 }
1561
1562 if (!change_to_user(conn,session_tag)) {
1563 DEBUG(0, ("Error: Could not change to user. Removing "
1564 "deferred open, mid=%llu.\n",
1565 (unsigned long long)req->mid));
1566 reply_force_doserror(req, ERRSRV, ERRbaduid);
1567 return conn;
1568 }
1569
1570 /* All NEED_WRITE and CAN_IPC flags must also have AS_USER. */
1571
1572 /* Does it need write permission? */
1573 if ((flags & NEED_WRITE) && !CAN_WRITE(conn)) {
1574 reply_nterror(req, NT_STATUS_MEDIA_WRITE_PROTECTED);
1575 return conn;
1576 }
1577
1578 /* IPC services are limited */
1579 if (IS_IPC(conn) && !(flags & CAN_IPC)) {
1580 reply_nterror(req, NT_STATUS_ACCESS_DENIED);
1581 return conn;
1582 }
1583 } else {
1584 /* This call needs to be run as root */
1585 change_to_root_user();
1586 }
1587
1588 /* load service specific parameters */
1589 if (conn) {
1590 if (req->encrypted) {
1591 conn->encrypted_tid = true;
1592 /* encrypted required from now on. */
1593 conn->encrypt_level = SMB_SIGNING_REQUIRED;
1594 } else if (ENCRYPTION_REQUIRED(conn)) {
1595 if (req->cmd != SMBtrans2 && req->cmd != SMBtranss2) {
1596 DEBUG(1,("service[%s] requires encryption"
1597 "%s ACCESS_DENIED. mid=%llu\n",
1598 lp_servicename(talloc_tos(), SNUM(conn)),
1599 smb_fn_name(type),
1600 (unsigned long long)req->mid));
1601 reply_nterror(req, NT_STATUS_ACCESS_DENIED);
1602 return conn;
1603 }
1604 }
1605
1606 if (!set_current_service(conn,SVAL(req->inbuf,smb_flg),
1607 (flags & (AS_USER|DO_CHDIR)
1608 ?True:False))) {
1609 reply_nterror(req, NT_STATUS_ACCESS_DENIED);
1610 return conn;
1611 }
1612 conn->num_smb_operations++;
1613 }
1614
1615 /*
1616 * Does this protocol need to be run as guest? (Only archane
1617 * messenger service requests have this...)
1618 */
1619 if (flags & AS_GUEST) {
1620 char *raddr;
1621 bool ok;
1622
1623 if (!change_to_guest()) {
1624 reply_nterror(req, NT_STATUS_ACCESS_DENIED);
1625 return conn;
1626 }
1627
1628 raddr = tsocket_address_inet_addr_string(xconn->remote_address,
1629 talloc_tos());
1630 if (raddr == NULL) {
1631 reply_nterror(req, NT_STATUS_NO_MEMORY);
1632 return conn;
1633 }
1634
1635 /*
1636 * Haven't we checked this in smbd_process already???
1637 */
1638
1639 ok = allow_access(lp_hosts_deny(-1), lp_hosts_allow(-1),
1640 xconn->remote_hostname, raddr);
1641 TALLOC_FREE(raddr);
1642
1643 if (!ok) {
1644 reply_nterror(req, NT_STATUS_ACCESS_DENIED);
1645 return conn;
1646 }
1647 }
1648
1649 smb_messages[type].fn(req);
1650 return req->conn;
1651 }
1652
1653 /****************************************************************************
1654 Construct a reply to the incoming packet.
1655 ****************************************************************************/
1656
1657 static void construct_reply(struct smbXsrv_connection *xconn,
1658 char *inbuf, int size, size_t unread_bytes,
1659 uint32_t seqnum, bool encrypted,
1660 struct smb_perfcount_data *deferred_pcd)
1661 {
1662 struct smbd_server_connection *sconn = xconn->client->sconn;
1663 struct smb_request *req;
1664
1665 if (!(req = talloc(talloc_tos(), struct smb_request))) {
1666 smb_panic("could not allocate smb_request");
1667 }
1668
1669 if (!init_smb_request(req, sconn, xconn, (uint8_t *)inbuf, unread_bytes,
1670 encrypted, seqnum)) {
1671 exit_server_cleanly("Invalid SMB request");
1672 }
1673
1674 req->inbuf = (uint8_t *)talloc_move(req, &inbuf);
1675
1676 /* we popped this message off the queue - keep original perf data */
1677 if (deferred_pcd)
1678 req->pcd = *deferred_pcd;
1679 else {
1680 SMB_PERFCOUNT_START(&req->pcd);
1681 SMB_PERFCOUNT_SET_OP(&req->pcd, req->cmd);
1682 SMB_PERFCOUNT_SET_MSGLEN_IN(&req->pcd, size);
1683 }
1684
1685 req->conn = switch_message(req->cmd, req);
1686
1687 if (req->outbuf == NULL) {
1688 /*
1689 * Request has suspended itself, will come
1690 * back here.
1691 */
1692 return;
1693 }
1694 if (CVAL(req->outbuf,0) == 0) {
1695 show_msg((char *)req->outbuf);
1696 }
1697 smb_request_done(req);
1698 }
1699
1700 static void construct_reply_chain(struct smbXsrv_connection *xconn,
1701 char *inbuf, int size, uint32_t seqnum,
1702 bool encrypted,
1703 struct smb_perfcount_data *deferred_pcd)
1704 {
1705 struct smb_request **reqs = NULL;
1706 struct smb_request *req;
1707 unsigned num_reqs;
1708 bool ok;
1709
1710 ok = smb1_parse_chain(talloc_tos(), (uint8_t *)inbuf, xconn, encrypted,
1711 seqnum, &reqs, &num_reqs);
1712 if (!ok) {
1713 char errbuf[smb_size];
1714 error_packet(errbuf, 0, 0, NT_STATUS_INVALID_PARAMETER,
1715 __LINE__, __FILE__);
1716 if (!srv_send_smb(xconn, errbuf, true, seqnum, encrypted,
1717 NULL)) {
1718 exit_server_cleanly("construct_reply_chain: "
1719 "srv_send_smb failed.");
1720 }
1721 return;
1722 }
1723
1724 req = reqs[0];
1725 req->inbuf = (uint8_t *)talloc_move(reqs, &inbuf);
1726
1727 req->conn = switch_message(req->cmd, req);
1728
1729 if (req->outbuf == NULL) {
1730 /*
1731 * Request has suspended itself, will come
1732 * back here.
1733 */
1734 return;
1735 }
1736 smb_request_done(req);
1737 }
1738
1739 /*
1740 * To be called from an async SMB handler that is potentially chained
1741 * when it is finished for shipping.
1742 */
1743
1744 void smb_request_done(struct smb_request *req)
1745 {
1746 struct smb_request **reqs = NULL;
1747 struct smb_request *first_req;
1748 size_t i, num_reqs, next_index;
1749 NTSTATUS status;
1750
1751 if (req->chain == NULL) {
1752 first_req = req;
1753 goto shipit;
1754 }
1755
1756 reqs = req->chain;
1757 num_reqs = talloc_array_length(reqs);
1758
1759 for (i=0; i<num_reqs; i++) {
1760 if (reqs[i] == req) {
1761 break;
1762 }
1763 }
1764 if (i == num_reqs) {
1765 /*
1766 * Invalid chain, should not happen
1767 */
1768 status = NT_STATUS_INTERNAL_ERROR;
1769 goto error;
1770 }
1771 next_index = i+1;
1772
1773 while ((next_index < num_reqs) && (IVAL(req->outbuf, smb_rcls) == 0)) {
1774 struct smb_request *next = reqs[next_index];
1775 struct smbXsrv_tcon *tcon;
1776 NTTIME now = timeval_to_nttime(&req->request_time);
1777
1778 next->vuid = SVAL(req->outbuf, smb_uid);
1779 next->tid = SVAL(req->outbuf, smb_tid);
1780 status = smb1srv_tcon_lookup(req->xconn, req->tid,
1781 now, &tcon);
1782 if (NT_STATUS_IS_OK(status)) {
1783 req->conn = tcon->compat;
1784 } else {
1785 req->conn = NULL;
1786 }
1787 next->chain_fsp = req->chain_fsp;
1788 next->inbuf = req->inbuf;
1789
1790 req = next;
1791 req->conn = switch_message(req->cmd, req);
1792
1793 if (req->outbuf == NULL) {
1794 /*
1795 * Request has suspended itself, will come
1796 * back here.
1797 */
1798 return;
1799 }
1800 next_index += 1;
1801 }
1802
1803 first_req = reqs[0];
1804
1805 for (i=1; i<next_index; i++) {
1806 bool ok;
1807
1808 ok = smb_splice_chain(&first_req->outbuf, reqs[i]->outbuf);
1809 if (!ok) {
1810 status = NT_STATUS_INTERNAL_ERROR;
1811 goto error;
1812 }
1813 }
1814
1815 SSVAL(first_req->outbuf, smb_uid, SVAL(req->outbuf, smb_uid));
1816 SSVAL(first_req->outbuf, smb_tid, SVAL(req->outbuf, smb_tid));
1817
1818 /*
1819 * This scary statement intends to set the
1820 * FLAGS2_32_BIT_ERROR_CODES flg2 field in first_req->outbuf
1821 * to the value last_req->outbuf carries
1822 */
1823 SSVAL(first_req->outbuf, smb_flg2,
1824 (SVAL(first_req->outbuf, smb_flg2) & ~FLAGS2_32_BIT_ERROR_CODES)
1825 |(SVAL(req->outbuf, smb_flg2) & FLAGS2_32_BIT_ERROR_CODES));
1826
1827 /*
1828 * Transfer the error codes from the subrequest to the main one
1829 */
1830 SSVAL(first_req->outbuf, smb_rcls, SVAL(req->outbuf, smb_rcls));
1831 SSVAL(first_req->outbuf, smb_err, SVAL(req->outbuf, smb_err));
1832
1833 _smb_setlen_large(
1834 first_req->outbuf, talloc_get_size(first_req->outbuf) - 4);
1835
1836 shipit:
1837 if (!srv_send_smb(first_req->xconn,
1838 (char *)first_req->outbuf,
1839 true, first_req->seqnum+1,
1840 IS_CONN_ENCRYPTED(req->conn)||first_req->encrypted,
1841 &first_req->pcd)) {
1842 exit_server_cleanly("construct_reply_chain: srv_send_smb "
1843 "failed.");
1844 }
1845 TALLOC_FREE(req); /* non-chained case */
1846 TALLOC_FREE(reqs); /* chained case */
1847 return;
1848
1849 error:
1850 {
1851 char errbuf[smb_size];
1852 error_packet(errbuf, 0, 0, status, __LINE__, __FILE__);
1853 if (!srv_send_smb(req->xconn, errbuf, true,
1854 req->seqnum+1, req->encrypted,
1855 NULL)) {
1856 exit_server_cleanly("construct_reply_chain: "
1857 "srv_send_smb failed.");
1858 }
1859 }
1860 TALLOC_FREE(req); /* non-chained case */
1861 TALLOC_FREE(reqs); /* chained case */
1862 }
1863
1864 /****************************************************************************
1865 Process an smb from the client
1866 ****************************************************************************/
1867 static void process_smb(struct smbXsrv_connection *xconn,
1868 uint8_t *inbuf, size_t nread, size_t unread_bytes,
1869 uint32_t seqnum, bool encrypted,
1870 struct smb_perfcount_data *deferred_pcd)
1871 {
1872 struct smbd_server_connection *sconn = xconn->client->sconn;
1873 int msg_type = CVAL(inbuf,0);
1874
1875 DO_PROFILE_INC(request);
1876
1877 DEBUG( 6, ( "got message type 0x%x of len 0x%x\n", msg_type,
1878 smb_len(inbuf) ) );
1879 DEBUG(3, ("Transaction %d of length %d (%u toread)\n",
1880 sconn->trans_num, (int)nread, (unsigned int)unread_bytes));
1881
1882 if (msg_type != NBSSmessage) {
1883 /*
1884 * NetBIOS session request, keepalive, etc.
1885 */
1886 reply_special(xconn, (char *)inbuf, nread);
1887 goto done;
1888 }
1889
1890 if (sconn->using_smb2) {
1891 /* At this point we're not really using smb2,
1892 * we make the decision here.. */
1893 if (smbd_is_smb2_header(inbuf, nread)) {
1894 const uint8_t *inpdu = inbuf + NBT_HDR_SIZE;
1895 size_t pdulen = nread - NBT_HDR_SIZE;
1896 smbd_smb2_first_negprot(xconn, inpdu, pdulen);
1897 return;
1898 } else if (nread >= smb_size && valid_smb_header(inbuf)
1899 && CVAL(inbuf, smb_com) != 0x72) {
1900 /* This is a non-negprot SMB1 packet.
1901 Disable SMB2 from now on. */
1902 sconn->using_smb2 = false;
1903 }
1904 }
1905
1906 /* Make sure this is an SMB packet. smb_size contains NetBIOS header
1907 * so subtract 4 from it. */
1908 if ((nread < (smb_size - 4)) || !valid_smb_header(inbuf)) {
1909 DEBUG(2,("Non-SMB packet of length %d. Terminating server\n",
1910 smb_len(inbuf)));
1911
1912 /* special magic for immediate exit */
1913 if ((nread == 9) &&
1914 (IVAL(inbuf, 4) == 0x74697865) &&
1915 lp_parm_bool(-1, "smbd", "suicide mode", false)) {
1916 uint8_t exitcode = CVAL(inbuf, 8);
1917 DEBUG(1, ("Exiting immediately with code %d\n",
1918 (int)exitcode));
1919 exit(exitcode);
1920 }
1921
1922 exit_server_cleanly("Non-SMB packet");
1923 }
1924
1925 show_msg((char *)inbuf);
1926
1927 if ((unread_bytes == 0) && smb1_is_chain(inbuf)) {
1928 construct_reply_chain(xconn, (char *)inbuf, nread,
1929 seqnum, encrypted, deferred_pcd);
1930 } else {
1931 construct_reply(xconn, (char *)inbuf, nread, unread_bytes,
1932 seqnum, encrypted, deferred_pcd);
1933 }
1934
1935 sconn->trans_num++;
1936
1937 done:
1938 sconn->num_requests++;
1939
1940 /* The timeout_processing function isn't run nearly
1941 often enough to implement 'max log size' without
1942 overrunning the size of the file by many megabytes.
1943 This is especially true if we are running at debug
1944 level 10. Checking every 50 SMBs is a nice
1945 tradeoff of performance vs log file size overrun. */
1946
1947 if ((sconn->num_requests % 50) == 0 &&
1948 need_to_check_log_size()) {
1949 change_to_root_user();
1950 check_log_size();
1951 }
1952 }
1953
1954 /****************************************************************************
1955 Return a string containing the function name of a SMB command.
1956 ****************************************************************************/
1957
1958 const char *smb_fn_name(int type)
1959 {
1960 const char *unknown_name = "SMBunknown";
1961
1962 if (smb_messages[type].name == NULL)
1963 return(unknown_name);
1964
1965 return(smb_messages[type].name);
1966 }
1967
1968 /****************************************************************************
1969 Helper functions for contruct_reply.
1970 ****************************************************************************/
1971
1972 void add_to_common_flags2(uint32_t v)
1973 {
1974 common_flags2 |= v;
1975 }
1976
1977 void remove_from_common_flags2(uint32_t v)
1978 {
1979 common_flags2 &= ~v;
1980 }
1981
1982 static void construct_reply_common(uint8_t cmd, const uint8_t *inbuf,
1983 char *outbuf)
1984 {
1985 uint16_t in_flags2 = SVAL(inbuf,smb_flg2);
1986 uint16_t out_flags2 = common_flags2;
1987
1988 out_flags2 |= in_flags2 & FLAGS2_UNICODE_STRINGS;
1989 out_flags2 |= in_flags2 & FLAGS2_SMB_SECURITY_SIGNATURES;
1990 out_flags2 |= in_flags2 & FLAGS2_SMB_SECURITY_SIGNATURES_REQUIRED;
1991
1992 srv_set_message(outbuf,0,0,false);
1993
1994 SCVAL(outbuf, smb_com, cmd);
1995 SIVAL(outbuf,smb_rcls,0);
1996 SCVAL(outbuf,smb_flg, FLAG_REPLY | (CVAL(inbuf,smb_flg) & FLAG_CASELESS_PATHNAMES));
1997 SSVAL(outbuf,smb_flg2, out_flags2);
1998 memset(outbuf+smb_pidhigh,'\0',(smb_tid-smb_pidhigh));
1999 memcpy(outbuf+smb_ss_field, inbuf+smb_ss_field, 8);
2000
2001 SSVAL(outbuf,smb_tid,SVAL(inbuf,smb_tid));
2002 SSVAL(outbuf,smb_pid,SVAL(inbuf,smb_pid));
2003 SSVAL(outbuf,smb_uid,SVAL(inbuf,smb_uid));
2004 SSVAL(outbuf,smb_mid,SVAL(inbuf,smb_mid));
2005 }
2006
2007 void construct_reply_common_req(struct smb_request *req, char *outbuf)
2008 {
2009 construct_reply_common(req->cmd, req->inbuf, outbuf);
2010 }
2011
2012 /**
2013 * @brief Find the smb_cmd offset of the last command pushed
2014 * @param[in] buf The buffer we're building up
2015 * @retval Where can we put our next andx cmd?
2016 *
2017 * While chaining requests, the "next" request we're looking at needs to put
2018 * its SMB_Command before the data the previous request already built up added
2019 * to the chain. Find the offset to the place where we have to put our cmd.
2020 */
2021
2022 static bool find_andx_cmd_ofs(uint8_t *buf, size_t *pofs)
2023 {
2024 uint8_t cmd;
2025 size_t ofs;
2026
2027 cmd = CVAL(buf, smb_com);
2028
2029 if (!is_andx_req(cmd)) {
2030 return false;
2031 }
2032
2033 ofs = smb_vwv0;
2034
2035 while (CVAL(buf, ofs) != 0xff) {
2036
2037 if (!is_andx_req(CVAL(buf, ofs))) {
2038 return false;
2039 }
2040
2041 /*
2042 * ofs is from start of smb header, so add the 4 length
2043 * bytes. The next cmd is right after the wct field.
2044 */
2045 ofs = SVAL(buf, ofs+2) + 4 + 1;
2046
2047 if (ofs+4 >= talloc_get_size(buf)) {
2048 return false;
2049 }
2050 }
2051
2052 *pofs = ofs;
2053 return true;
2054 }
2055
2056 /**
2057 * @brief Do the smb chaining at a buffer level
2058 * @param[in] poutbuf Pointer to the talloc'ed buffer to be modified
2059 * @param[in] andx_buf Buffer to be appended
2060 */
2061
2062 static bool smb_splice_chain(uint8_t **poutbuf, const uint8_t *andx_buf)
2063 {
2064 uint8_t smb_command = CVAL(andx_buf, smb_com);
2065 uint8_t wct = CVAL(andx_buf, smb_wct);
2066 const uint16_t *vwv = (const uint16_t *)(andx_buf + smb_vwv);
2067 uint32_t num_bytes = smb_buflen(andx_buf);
2068 const uint8_t *bytes = (const uint8_t *)smb_buf_const(andx_buf);
2069
2070 uint8_t *outbuf;
2071 size_t old_size, new_size;
2072 size_t ofs;
2073 size_t chain_padding = 0;
2074 size_t andx_cmd_ofs;
2075
2076
2077 old_size = talloc_get_size(*poutbuf);
2078
2079 if ((old_size % 4) != 0) {
2080 /*
2081 * Align the wct field of subsequent requests to a 4-byte
2082 * boundary
2083 */
2084 chain_padding = 4 - (old_size % 4);
2085 }
2086
2087 /*
2088 * After the old request comes the new wct field (1 byte), the vwv's
2089 * and the num_bytes field.
2090 */
2091
2092 new_size = old_size + chain_padding + 1 + wct * sizeof(uint16_t) + 2;
2093 new_size += num_bytes;
2094
2095 if ((smb_command != SMBwriteX) && (new_size > 0xffff)) {
2096 DEBUG(1, ("smb_splice_chain: %u bytes won't fit\n",
2097 (unsigned)new_size));
2098 return false;
2099 }
2100
2101 outbuf = talloc_realloc(NULL, *poutbuf, uint8_t, new_size);
2102 if (outbuf == NULL) {
2103 DEBUG(0, ("talloc failed\n"));
2104 return false;
2105 }
2106 *poutbuf = outbuf;
2107
2108 if (!find_andx_cmd_ofs(outbuf, &andx_cmd_ofs)) {
2109 DEBUG(1, ("invalid command chain\n"));
2110 *poutbuf = talloc_realloc(NULL, *poutbuf, uint8_t, old_size);
2111 return false;
2112 }
2113
2114 if (chain_padding != 0) {
2115 memset(outbuf + old_size, 0, chain_padding);
2116 old_size += chain_padding;
2117 }
2118
2119 SCVAL(outbuf, andx_cmd_ofs, smb_command);
2120 SSVAL(outbuf, andx_cmd_ofs + 2, old_size - 4);
2121
2122 ofs = old_size;
2123
2124 /*
2125 * Push the chained request:
2126 *
2127 * wct field
2128 */
2129
2130 SCVAL(outbuf, ofs, wct);
2131 ofs += 1;
2132
2133 /*
2134 * vwv array
2135 */
2136
2137 memcpy(outbuf + ofs, vwv, sizeof(uint16_t) * wct);
2138
2139 /*
2140 * HACK ALERT
2141 *
2142 * Read&X has an offset into its data buffer at
2143 * vwv[6]. reply_read_andx has no idea anymore that it's
2144 * running from within a chain, so we have to fix up the
2145 * offset here.
2146 *
2147 * Although it looks disgusting at this place, I want to keep
2148 * it here. The alternative would be to push knowledge about
2149 * the andx chain down into read&x again.
2150 */
2151
2152 if (smb_command == SMBreadX) {
2153 uint8_t *bytes_addr;
2154
2155 if (wct < 7) {
2156 /*
2157 * Invalid read&x response
2158 */
2159 return false;
2160 }
2161
2162 bytes_addr = outbuf + ofs /* vwv start */
2163 + sizeof(uint16_t) * wct /* vwv array */
2164 + sizeof(uint16_t) /* bcc */
2165 + 1; /* padding byte */
2166
2167 SSVAL(outbuf + ofs, 6 * sizeof(uint16_t),
2168 bytes_addr - outbuf - 4);
2169 }
2170
2171 ofs += sizeof(uint16_t) * wct;
2172
2173 /*
2174 * bcc (byte count)
2175 */
2176
2177 SSVAL(outbuf, ofs, num_bytes);
2178 ofs += sizeof(uint16_t);
2179
2180 /*
2181 * The bytes field
2182 */
2183
2184 memcpy(outbuf + ofs, bytes, num_bytes);
2185
2186 return true;
2187 }
2188
2189 bool smb1_is_chain(const uint8_t *buf)
2190 {
2191 uint8_t cmd, wct, andx_cmd;
2192
2193 cmd = CVAL(buf, smb_com);
2194 if (!is_andx_req(cmd)) {
2195 return false;
2196 }
2197 wct = CVAL(buf, smb_wct);
2198 if (wct < 2) {
2199 return false;
2200 }
2201 andx_cmd = CVAL(buf, smb_vwv);
2202 return (andx_cmd != 0xFF);
2203 }
2204
2205 bool smb1_walk_chain(const uint8_t *buf,
2206 bool (*fn)(uint8_t cmd,
2207 uint8_t wct, const uint16_t *vwv,
2208 uint16_t num_bytes, const uint8_t *bytes,
2209 void *private_data),
2210 void *private_data)
2211 {
2212 size_t smblen = smb_len(buf);
2213 const char *smb_buf = smb_base(buf);
2214 uint8_t cmd, chain_cmd;
2215 uint8_t wct;
2216 const uint16_t *vwv;
2217 uint16_t num_bytes;
2218 const uint8_t *bytes;
2219
2220 cmd = CVAL(buf, smb_com);
2221 wct = CVAL(buf, smb_wct);
2222 vwv = (const uint16_t *)(buf + smb_vwv);
2223 num_bytes = smb_buflen(buf);
2224 bytes = (const uint8_t *)smb_buf_const(buf);
2225
2226 if (!fn(cmd, wct, vwv, num_bytes, bytes, private_data)) {
2227 return false;
2228 }
2229
2230 if (!is_andx_req(cmd)) {
2231 return true;
2232 }
2233 if (wct < 2) {
2234 return false;
2235 }
2236
2237 chain_cmd = CVAL(vwv, 0);
2238
2239 while (chain_cmd != 0xff) {
2240 uint32_t chain_offset; /* uint32_t to avoid overflow */
2241 size_t length_needed;
2242 ptrdiff_t vwv_offset;
2243
2244 chain_offset = SVAL(vwv+1, 0);
2245
2246 /*
2247 * Check if the client tries to fool us. The chain
2248 * offset needs to point beyond the current request in
2249 * the chain, it needs to strictly grow. Otherwise we
2250 * might be tricked into an endless loop always
2251 * processing the same request over and over again. We
2252 * used to assume that vwv and the byte buffer array
2253 * in a chain are always attached, but OS/2 the
2254 * Write&X/Read&X chain puts the Read&X vwv array
2255 * right behind the Write&X vwv chain. The Write&X bcc
2256 * array is put behind the Read&X vwv array. So now we
2257 * check whether the chain offset points strictly
2258 * behind the previous vwv array. req->buf points
2259 * right after the vwv array of the previous
2260 * request. See
2261 * https://bugzilla.samba.org/show_bug.cgi?id=8360 for
2262 * more information.
2263 */
2264
2265 vwv_offset = ((const char *)vwv - smb_buf);
2266 if (chain_offset <= vwv_offset) {
2267 return false;
2268 }
2269
2270 /*
2271 * Next check: Make sure the chain offset does not
2272 * point beyond the overall smb request length.
2273 */
2274
2275 length_needed = chain_offset+1; /* wct */
2276 if (length_needed > smblen) {
2277 return false;
2278 }
2279
2280 /*
2281 * Now comes the pointer magic. Goal here is to set up
2282 * vwv and buf correctly again. The chain offset (the
2283 * former vwv[1]) points at the new wct field.
2284 */
2285
2286 wct = CVAL(smb_buf, chain_offset);
2287
2288 if (is_andx_req(chain_cmd) && (wct < 2)) {
2289 return false;
2290 }
2291
2292 /*
2293 * Next consistency check: Make the new vwv array fits
2294 * in the overall smb request.
2295 */
2296
2297 length_needed += (wct+1)*sizeof(uint16_t); /* vwv+buflen */
2298 if (length_needed > smblen) {
2299 return false;
2300 }
2301 vwv = (const uint16_t *)(smb_buf + chain_offset + 1);
2302
2303 /*
2304 * Now grab the new byte buffer....
2305 */
2306
2307 num_bytes = SVAL(vwv+wct, 0);
2308
2309 /*
2310 * .. and check that it fits.
2311 */
2312
2313 length_needed += num_bytes;
2314 if (length_needed > smblen) {
2315 return false;
2316 }
2317 bytes = (const uint8_t *)(vwv+wct+1);
2318
2319 if (!fn(chain_cmd, wct, vwv, num_bytes, bytes, private_data)) {
2320 return false;
2321 }
2322
2323 if (!is_andx_req(chain_cmd)) {
2324 return true;
2325 }
2326 chain_cmd = CVAL(vwv, 0);
2327 }
2328 return true;
2329 }
2330
2331 static bool smb1_chain_length_cb(uint8_t cmd,
2332 uint8_t wct, const uint16_t *vwv,
2333 uint16_t num_bytes, const uint8_t *bytes,
2334 void *private_data)
2335 {
2336 unsigned *count = (unsigned *)private_data;
2337 *count += 1;
2338 return true;
2339 }
2340
2341 unsigned smb1_chain_length(const uint8_t *buf)
2342 {
2343 unsigned count = 0;
2344
2345 if (!smb1_walk_chain(buf, smb1_chain_length_cb, &count)) {
2346 return 0;
2347 }
2348 return count;
2349 }
2350
2351 struct smb1_parse_chain_state {
2352 TALLOC_CTX *mem_ctx;
2353 const uint8_t *buf;
2354 struct smbd_server_connection *sconn;
2355 struct smbXsrv_connection *xconn;
2356 bool encrypted;
2357 uint32_t seqnum;
2358
2359 struct smb_request **reqs;
2360 unsigned num_reqs;
2361 };
2362
2363 static bool smb1_parse_chain_cb(uint8_t cmd,
2364 uint8_t wct, const uint16_t *vwv,
2365 uint16_t num_bytes, const uint8_t *bytes,
2366 void *private_data)
2367 {
2368 struct smb1_parse_chain_state *state =
2369 (struct smb1_parse_chain_state *)private_data;
2370 struct smb_request **reqs;
2371 struct smb_request *req;
2372 bool ok;
2373
2374 reqs = talloc_realloc(state->mem_ctx, state->reqs,
2375 struct smb_request *, state->num_reqs+1);
2376 if (reqs == NULL) {
2377 return false;
2378 }
2379 state->reqs = reqs;
2380
2381 req = talloc(reqs, struct smb_request);
2382 if (req == NULL) {
2383 return false;
2384 }
2385
2386 ok = init_smb_request(req, state->sconn, state->xconn, state->buf, 0,
2387 state->encrypted, state->seqnum);
2388 if (!ok) {
2389 return false;
2390 }
2391 req->cmd = cmd;
2392 req->wct = wct;
2393 req->vwv = vwv;
2394 req->buflen = num_bytes;
2395 req->buf = bytes;
2396
2397 reqs[state->num_reqs] = req;
2398 state->num_reqs += 1;
2399 return true;
2400 }
2401
2402 bool smb1_parse_chain(TALLOC_CTX *mem_ctx, const uint8_t *buf,
2403 struct smbXsrv_connection *xconn,
2404 bool encrypted, uint32_t seqnum,
2405 struct smb_request ***reqs, unsigned *num_reqs)
2406 {
2407 struct smbd_server_connection *sconn = NULL;
2408 struct smb1_parse_chain_state state;
2409 unsigned i;
2410
2411 if (xconn != NULL) {
2412 sconn = xconn->client->sconn;
2413 }
2414
2415 state.mem_ctx = mem_ctx;
2416 state.buf = buf;
2417 state.sconn = sconn;
2418 state.xconn = xconn;
2419 state.encrypted = encrypted;
2420 state.seqnum = seqnum;
2421 state.reqs = NULL;
2422 state.num_reqs = 0;
2423
2424 if (!smb1_walk_chain(buf, smb1_parse_chain_cb, &state)) {
2425 TALLOC_FREE(state.reqs);
2426 return false;
2427 }
2428 for (i=0; i<state.num_reqs; i++) {
2429 state.reqs[i]->chain = state.reqs;
2430 }
2431 *reqs = state.reqs;
2432 *num_reqs = state.num_reqs;
2433 return true;
2434 }
2435
2436 /****************************************************************************
2437 Check if services need reloading.
2438 ****************************************************************************/
2439
2440 static void check_reload(struct smbd_server_connection *sconn, time_t t)
2441 {
2442
2443 if (last_smb_conf_reload_time == 0) {
2444 last_smb_conf_reload_time = t;
2445 }
2446
2447 if (t >= last_smb_conf_reload_time+SMBD_RELOAD_CHECK) {
2448 reload_services(sconn, conn_snum_used, true);
2449 last_smb_conf_reload_time = t;
2450 }
2451 }
2452
2453 static bool fd_is_readable(int fd)
2454 {
2455 int ret, revents;
2456
2457 ret = poll_one_fd(fd, POLLIN|POLLHUP, 0, &revents);
2458
2459 return ((ret > 0) && ((revents & (POLLIN|POLLHUP|POLLERR)) != 0));
2460
2461 }
2462
2463 static void smbd_server_connection_write_handler(
2464 struct smbXsrv_connection *xconn)
2465 {
2466 /* TODO: make write nonblocking */
2467 }
2468
2469 static void smbd_server_connection_read_handler(
2470 struct smbXsrv_connection *xconn, int fd)
2471 {
2472 uint8_t *inbuf = NULL;
2473 size_t inbuf_len = 0;
2474 size_t unread_bytes = 0;
2475 bool encrypted = false;
2476 TALLOC_CTX *mem_ctx = talloc_tos();
2477 NTSTATUS status;
2478 uint32_t seqnum;
2479
2480 bool async_echo = lp_async_smb_echo_handler();
2481 bool from_client = false;
2482
2483 if (async_echo) {
2484 if (fd_is_readable(xconn->smb1.echo_handler.trusted_fd)) {
2485 /*
2486 * This is the super-ugly hack to prefer the packets
2487 * forwarded by the echo handler over the ones by the
2488 * client directly
2489 */
2490 fd = xconn->smb1.echo_handler.trusted_fd;
2491 }
2492 }
2493
2494 from_client = (xconn->transport.sock == fd);
2495
2496 if (async_echo && from_client) {
2497 smbd_lock_socket(xconn);
2498
2499 if (!fd_is_readable(fd)) {
2500 DEBUG(10,("the echo listener was faster\n"));
2501 smbd_unlock_socket(xconn);
2502 return;
2503 }
2504 }
2505
2506 /* TODO: make this completely nonblocking */
2507 status = receive_smb_talloc(mem_ctx, xconn, fd,
2508 (char **)(void *)&inbuf,
2509 0, /* timeout */
2510 &unread_bytes,
2511 &encrypted,
2512 &inbuf_len, &seqnum,
2513 !from_client /* trusted channel */);
2514
2515 if (async_echo && from_client) {
2516 smbd_unlock_socket(xconn);
2517 }
2518
2519 if (NT_STATUS_EQUAL(status, NT_STATUS_RETRY)) {
2520 goto process;
2521 }
2522 if (NT_STATUS_IS_ERR(status)) {
2523 exit_server_cleanly("failed to receive smb request");
2524 }
2525 if (!NT_STATUS_IS_OK(status)) {
2526 return;
2527 }
2528
2529 process:
2530 process_smb(xconn, inbuf, inbuf_len, unread_bytes,
2531 seqnum, encrypted, NULL);
2532 }
2533
2534 static void smbd_server_connection_handler(struct tevent_context *ev,
2535 struct tevent_fd *fde,
2536 uint16_t flags,
2537 void *private_data)
2538 {
2539 struct smbXsrv_connection *xconn =
2540 talloc_get_type_abort(private_data,
2541 struct smbXsrv_connection);
2542
2543 if (!NT_STATUS_IS_OK(xconn->transport.status)) {
2544 /*
2545 * we're not supposed to do any io
2546 */
2547 TEVENT_FD_NOT_READABLE(xconn->transport.fde);
2548 TEVENT_FD_NOT_WRITEABLE(xconn->transport.fde);
2549 return;
2550 }
2551
2552 if (flags & TEVENT_FD_WRITE) {
2553 smbd_server_connection_write_handler(xconn);
2554 return;
2555 }
2556 if (flags & TEVENT_FD_READ) {
2557 smbd_server_connection_read_handler(xconn, xconn->transport.sock);
2558 return;
2559 }
2560 }
2561
2562 static void smbd_server_echo_handler(struct tevent_context *ev,
2563 struct tevent_fd *fde,
2564 uint16_t flags,
2565 void *private_data)
2566 {
2567 struct smbXsrv_connection *xconn =
2568 talloc_get_type_abort(private_data,
2569 struct smbXsrv_connection);
2570
2571 if (!NT_STATUS_IS_OK(xconn->transport.status)) {
2572 /*
2573 * we're not supposed to do any io
2574 */
2575 TEVENT_FD_NOT_READABLE(xconn->smb1.echo_handler.trusted_fde);
2576 TEVENT_FD_NOT_WRITEABLE(xconn->smb1.echo_handler.trusted_fde);
2577 return;
2578 }
2579
2580 if (flags & TEVENT_FD_WRITE) {
2581 smbd_server_connection_write_handler(xconn);
2582 return;
2583 }
2584 if (flags & TEVENT_FD_READ) {
2585 smbd_server_connection_read_handler(
2586 xconn, xconn->smb1.echo_handler.trusted_fd);
2587 return;
2588 }
2589 }
2590
2591 struct smbd_release_ip_state {
2592 struct smbXsrv_connection *xconn;
2593 struct tevent_immediate *im;
2594 char addr[INET6_ADDRSTRLEN];
2595 };
2596
2597 static void smbd_release_ip_immediate(struct tevent_context *ctx,
2598 struct tevent_immediate *im,
2599 void *private_data)
2600 {
2601 struct smbd_release_ip_state *state =
2602 talloc_get_type_abort(private_data,
2603 struct smbd_release_ip_state);
2604 struct smbXsrv_connection *xconn = state->xconn;
2605
2606 if (!NT_STATUS_EQUAL(xconn->transport.status, NT_STATUS_ADDRESS_CLOSED)) {
2607 /*
2608 * smbd_server_connection_terminate() already triggered ?
2609 */
2610 return;
2611 }
2612
2613 smbd_server_connection_terminate(xconn, "CTDB_SRVID_RELEASE_IP");
2614 }
2615
2616 /****************************************************************************
2617 received when we should release a specific IP
2618 ****************************************************************************/
2619 static bool release_ip(const char *ip, void *priv)
2620 {
2621 struct smbd_release_ip_state *state =
2622 talloc_get_type_abort(priv,
2623 struct smbd_release_ip_state);
2624 struct smbXsrv_connection *xconn = state->xconn;
2625 const char *addr = state->addr;
2626 const char *p = addr;
2627
2628 if (!NT_STATUS_IS_OK(xconn->transport.status)) {
2629 /* avoid recursion */
2630 return false;
2631 }
2632
2633 if (strncmp("::ffff:", addr, 7) == 0) {
2634 p = addr + 7;
2635 }
2636
2637 DEBUG(10, ("Got release IP message for %s, "
2638 "our address is %s\n", ip, p));
2639
2640 if ((strcmp(p, ip) == 0) || ((p != addr) && strcmp(addr, ip) == 0)) {
2641 DEBUG(0,("Got release IP message for our IP %s - exiting immediately\n",
2642 ip));
2643 /*
2644 * With SMB2 we should do a clean disconnect,
2645 * the previous_session_id in the session setup
2646 * will cleanup the old session, tcons and opens.
2647 *
2648 * A clean disconnect is needed in order to support
2649 * durable handles.
2650 *
2651 * Note: typically this is never triggered
2652 * as we got a TCP RST (triggered by ctdb event scripts)
2653 * before we get CTDB_SRVID_RELEASE_IP.
2654 *
2655 * We used to call _exit(1) here, but as this was mostly never
2656 * triggered and has implication on our process model,
2657 * we can just use smbd_server_connection_terminate()
2658 * (also for SMB1).
2659 *
2660 * We don't call smbd_server_connection_terminate() directly
2661 * as we might be called from within ctdbd_migrate(),
2662 * we need to defer our action to the next event loop
2663 */
2664 tevent_schedule_immediate(state->im, xconn->ev_ctx,
2665 smbd_release_ip_immediate, state);
2666
2667 /*
2668 * Make sure we don't get any io on the connection.
2669 */
2670 xconn->transport.status = NT_STATUS_ADDRESS_CLOSED;
2671 return true;
2672 }
2673
2674 return false;
2675 }
2676
2677 static NTSTATUS smbd_register_ips(struct smbXsrv_connection *xconn,
2678 struct sockaddr_storage *srv,
2679 struct sockaddr_storage *clnt)
2680 {
2681 struct smbd_release_ip_state *state;
2682 struct ctdbd_connection *cconn;
2683
2684 cconn = messaging_ctdbd_connection();
2685 if (cconn == NULL) {
2686 return NT_STATUS_NO_MEMORY;
2687 }
2688
2689 state = talloc_zero(xconn, struct smbd_release_ip_state);
2690 if (state == NULL) {
2691 return NT_STATUS_NO_MEMORY;
2692 }
2693 state->xconn = xconn;
2694 state->im = tevent_create_immediate(state);
2695 if (state->im == NULL) {
2696 return NT_STATUS_NO_MEMORY;
2697 }
2698 if (print_sockaddr(state->addr, sizeof(state->addr), srv) == NULL) {
2699 return NT_STATUS_NO_MEMORY;
2700 }
2701
2702 return ctdbd_register_ips(cconn, srv, clnt, release_ip, state);
2703 }
2704
2705 static void msg_kill_client_ip(struct messaging_context *msg_ctx,
2706 void *private_data, uint32_t msg_type,
2707 struct server_id server_id, DATA_BLOB *data)
2708 {
2709 struct smbd_server_connection *sconn = talloc_get_type_abort(
2710 private_data, struct smbd_server_connection);
2711 const char *ip = (char *) data->data;
2712 char *client_ip;
2713
2714 DBG_DEBUG("Got kill request for client IP %s\n", ip);
2715
2716 client_ip = tsocket_address_inet_addr_string(sconn->remote_address,
2717 talloc_tos());
2718 if (client_ip == NULL) {
2719 return;
2720 }
2721
2722 if (strequal(ip, client_ip)) {
2723 DBG_WARNING("Got kill client message for %s - "
2724 "exiting immediately\n", ip);
2725 exit_server_cleanly("Forced disconnect for client");
2726 }
2727
2728 TALLOC_FREE(client_ip);
2729 }
2730
2731 /*
2732 * Send keepalive packets to our client
2733 */
2734 static bool keepalive_fn(const struct timeval *now, void *private_data)
2735 {
2736 struct smbd_server_connection *sconn = talloc_get_type_abort(
2737 private_data, struct smbd_server_connection);
2738 struct smbXsrv_connection *xconn = NULL;
2739 bool ret;
2740
2741 if (sconn->using_smb2) {
2742 /* Don't do keepalives on an SMB2 connection. */
2743 return false;
2744 }
2745
2746 /*
2747 * With SMB1 we only have 1 connection
2748 */
2749 xconn = sconn->client->connections;
2750 smbd_lock_socket(xconn);
2751 ret = send_keepalive(xconn->transport.sock);
2752 smbd_unlock_socket(xconn);
2753
2754 if (!ret) {
2755 int saved_errno = errno;
2756 /*
2757 * Try and give an error message saying what
2758 * client failed.
2759 */
2760 DEBUG(0, ("send_keepalive failed for client %s. "
2761 "Error %s - exiting\n",
2762 smbXsrv_connection_dbg(xconn),
2763 strerror(saved_errno)));
2764 errno = saved_errno;
2765 return False;
2766 }
2767 return True;
2768 }
2769
2770 /*
2771 * Do the recurring check if we're idle
2772 */
2773 static bool deadtime_fn(const struct timeval *now, void *private_data)
2774 {
2775 struct smbd_server_connection *sconn =
2776 (struct smbd_server_connection *)private_data;
2777
2778 if ((conn_num_open(sconn) == 0)
2779 || (conn_idle_all(sconn, now->tv_sec))) {
2780 DEBUG( 2, ( "Closing idle connection\n" ) );
2781 messaging_send(sconn->msg_ctx,
2782 messaging_server_id(sconn->msg_ctx),
2783 MSG_SHUTDOWN, &data_blob_null);
2784 return False;
2785 }
2786
2787 return True;
2788 }
2789
2790 /*
2791 * Do the recurring log file and smb.conf reload checks.
2792 */
2793
2794 static bool housekeeping_fn(const struct timeval *now, void *private_data)
2795 {
2796 struct smbd_server_connection *sconn = talloc_get_type_abort(
2797 private_data, struct smbd_server_connection);
2798
2799 DEBUG(5, ("housekeeping\n"));
2800
2801 change_to_root_user();
2802
2803 /* update printer queue caches if necessary */
2804 update_monitored_printq_cache(sconn->msg_ctx);
2805
2806 /* check if we need to reload services */
2807 check_reload(sconn, time_mono(NULL));
2808
2809 /*
2810 * Force a log file check.
2811 */
2812 force_check_log_size();
2813 check_log_size();
2814 return true;
2815 }
2816
2817 /*
2818 * Read an smb packet in the echo handler child, giving the parent
2819 * smbd one second to react once the socket becomes readable.
2820 */
2821
2822 struct smbd_echo_read_state {
2823 struct tevent_context *ev;
2824 struct smbXsrv_connection *xconn;
2825
2826 char *buf;
2827 size_t buflen;
2828 uint32_t seqnum;
2829 };
2830
2831 static void smbd_echo_read_readable(struct tevent_req *subreq);
2832 static void smbd_echo_read_waited(struct tevent_req *subreq);
2833
2834 static struct tevent_req *smbd_echo_read_send(
2835 TALLOC_CTX *mem_ctx, struct tevent_context *ev,
2836 struct smbXsrv_connection *xconn)
2837 {
2838 struct tevent_req *req, *subreq;
2839 struct smbd_echo_read_state *state;
2840
2841 req = tevent_req_create(mem_ctx, &state,
2842 struct smbd_echo_read_state);
2843 if (req == NULL) {
2844 return NULL;
2845 }
2846 state->ev = ev;
2847 state->xconn = xconn;
2848
2849 subreq = wait_for_read_send(state, ev, xconn->transport.sock);
2850 if (tevent_req_nomem(subreq, req)) {
2851 return tevent_req_post(req, ev);
2852 }
2853 tevent_req_set_callback(subreq, smbd_echo_read_readable, req);
2854 return req;
2855 }
2856
2857 static void smbd_echo_read_readable(struct tevent_req *subreq)
2858 {
2859 struct tevent_req *req = tevent_req_callback_data(
2860 subreq, struct tevent_req);
2861 struct smbd_echo_read_state *state = tevent_req_data(
2862 req, struct smbd_echo_read_state);
2863 bool ok;
2864 int err;
2865
2866 ok = wait_for_read_recv(subreq, &err);
2867 TALLOC_FREE(subreq);
2868 if (!ok) {
2869 tevent_req_nterror(req, map_nt_error_from_unix(err));
2870 return;
2871 }
2872
2873 /*
2874 * Give the parent smbd one second to step in
2875 */
2876
2877 subreq = tevent_wakeup_send(
2878 state, state->ev, timeval_current_ofs(1, 0));
2879 if (tevent_req_nomem(subreq, req)) {
2880 return;
2881 }
2882 tevent_req_set_callback(subreq, smbd_echo_read_waited, req);
2883 }
2884
2885 static void smbd_echo_read_waited(struct tevent_req *subreq)
2886 {
2887 struct tevent_req *req = tevent_req_callback_data(
2888 subreq, struct tevent_req);
2889 struct smbd_echo_read_state *state = tevent_req_data(
2890 req, struct smbd_echo_read_state);
2891 struct smbXsrv_connection *xconn = state->xconn;
2892 bool ok;
2893 NTSTATUS status;
2894 size_t unread = 0;
2895 bool encrypted;
2896
2897 ok = tevent_wakeup_recv(subreq);
2898 TALLOC_FREE(subreq);
2899 if (!ok) {
2900 tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
2901 return;
2902 }
2903
2904 ok = smbd_lock_socket_internal(xconn);
2905 if (!ok) {
2906 tevent_req_nterror(req, map_nt_error_from_unix(errno));
2907 DEBUG(0, ("%s: failed to lock socket\n", __location__));
2908 return;
2909 }
2910
2911 if (!fd_is_readable(xconn->transport.sock)) {
2912 DEBUG(10,("echo_handler[%d] the parent smbd was faster\n",
2913 (int)getpid()));
2914
2915 ok = smbd_unlock_socket_internal(xconn);
2916 if (!ok) {
2917 tevent_req_nterror(req, map_nt_error_from_unix(errno));
2918 DEBUG(1, ("%s: failed to unlock socket\n",
2919 __location__));
2920 return;
2921 }
2922
2923 subreq = wait_for_read_send(state, state->ev,
2924 xconn->transport.sock);
2925 if (tevent_req_nomem(subreq, req)) {
2926 return;
2927 }
2928 tevent_req_set_callback(subreq, smbd_echo_read_readable, req);
2929 return;
2930 }
2931
2932 status = receive_smb_talloc(state, xconn,
2933 xconn->transport.sock,
2934 &state->buf,
2935 0 /* timeout */,
2936 &unread,
2937 &encrypted,
2938 &state->buflen,
2939 &state->seqnum,
2940 false /* trusted_channel*/);
2941
2942 if (tevent_req_nterror(req, status)) {
2943 tevent_req_nterror(req, status);
2944 DEBUG(1, ("echo_handler[%d]: receive_smb_raw_talloc failed: %s\n",
2945 (int)getpid(), nt_errstr(status)));
2946 return;
2947 }
2948
2949 ok = smbd_unlock_socket_internal(xconn);
2950 if (!ok) {
2951 tevent_req_nterror(req, map_nt_error_from_unix(errno));
2952 DEBUG(1, ("%s: failed to unlock socket\n", __location__));
2953 return;
2954 }
2955 tevent_req_done(req);
2956 }
2957
2958 static NTSTATUS smbd_echo_read_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
2959 char **pbuf, size_t *pbuflen, uint32_t *pseqnum)
2960 {
2961 struct smbd_echo_read_state *state = tevent_req_data(
2962 req, struct smbd_echo_read_state);
2963 NTSTATUS status;
2964
2965 if (tevent_req_is_nterror(req, &status)) {
2966 return status;
2967 }
2968 *pbuf = talloc_move(mem_ctx, &state->buf);
2969 *pbuflen = state->buflen;
2970 *pseqnum = state->seqnum;
2971 return NT_STATUS_OK;
2972 }
2973
2974 struct smbd_echo_state {
2975 struct tevent_context *ev;
2976 struct iovec *pending;
2977 struct smbd_server_connection *sconn;
2978 struct smbXsrv_connection *xconn;
2979 int parent_pipe;
2980
2981 struct tevent_fd *parent_fde;
2982
2983 struct tevent_req *write_req;
2984 };
2985
2986 static void smbd_echo_writer_done(struct tevent_req *req);
2987
2988 static void smbd_echo_activate_writer(struct smbd_echo_state *state)
2989 {
2990 int num_pending;
2991
2992 if (state->write_req != NULL) {
2993 return;
2994 }
2995
2996 num_pending = talloc_array_length(state->pending);
2997 if (num_pending == 0) {
2998 return;
2999 }
3000
3001 state->write_req = writev_send(state, state->ev, NULL,
3002 state->parent_pipe, false,
3003 state->pending, num_pending);
3004 if (state->write_req == NULL) {
3005 DEBUG(1, ("writev_send failed\n"));
3006 exit(1);
3007 }
3008
3009 talloc_steal(state->write_req, state->pending);
3010 state->pending = NULL;
3011
3012 tevent_req_set_callback(state->write_req, smbd_echo_writer_done,
3013 state);
3014 }
3015
3016 static void smbd_echo_writer_done(struct tevent_req *req)
3017 {
3018 struct smbd_echo_state *state = tevent_req_callback_data(
3019 req, struct smbd_echo_state);
3020 ssize_t written;
3021 int err;
3022
3023 written = writev_recv(req, &err);
3024 TALLOC_FREE(req);
3025 state->write_req = NULL;
3026 if (written == -1) {
3027 DEBUG(1, ("writev to parent failed: %s\n", strerror(err)));
3028 exit(1);
3029 }
3030 DEBUG(10,("echo_handler[%d]: forwarded pdu to main\n", (int)getpid()));
3031 smbd_echo_activate_writer(state);
3032 }
3033
3034 static bool smbd_echo_reply(struct smbd_echo_state *state,
3035 uint8_t *inbuf, size_t inbuf_len,
3036 uint32_t seqnum)
3037 {
3038 struct smb_request req;
3039 uint16_t num_replies;
3040 char *outbuf;
3041 bool ok;
3042
3043 if ((inbuf_len == 4) && (CVAL(inbuf, 0) == NBSSkeepalive)) {
3044 DEBUG(10, ("Got netbios keepalive\n"));
3045 /*
3046 * Just swallow it
3047 */
3048 return true;
3049 }
3050
3051 if (inbuf_len < smb_size) {
3052 DEBUG(10, ("Got short packet: %d bytes\n", (int)inbuf_len));
3053 return false;
3054 }
3055 if (!valid_smb_header(inbuf)) {
3056 DEBUG(10, ("Got invalid SMB header\n"));
3057 return false;
3058 }
3059
3060 if (!init_smb_request(&req, state->sconn, state->xconn, inbuf, 0, false,
3061 seqnum)) {
3062 return false;
3063 }
3064 req.inbuf = inbuf;
3065
3066 DEBUG(10, ("smbecho handler got cmd %d (%s)\n", (int)req.cmd,
3067 smb_messages[req.cmd].name
3068 ? smb_messages[req.cmd].name : "unknown"));
3069
3070 if (req.cmd != SMBecho) {
3071 return false;
3072 }
3073 if (req.wct < 1) {
3074 return false;
3075 }
3076
3077 num_replies = SVAL(req.vwv+0, 0);
3078 if (num_replies != 1) {
3079 /* Not a Windows "Hey, you're still there?" request */
3080 return false;
3081 }
3082
3083 if (!create_outbuf(talloc_tos(), &req, req.inbuf, &outbuf,
3084 1, req.buflen)) {
3085 DEBUG(10, ("create_outbuf failed\n"));
3086 return false;
3087 }
3088 req.outbuf = (uint8_t *)outbuf;
3089
3090 SSVAL(req.outbuf, smb_vwv0, num_replies);
3091
3092 if (req.buflen > 0) {
3093 memcpy(smb_buf(req.outbuf), req.buf, req.buflen);
3094 }
3095
3096 ok = srv_send_smb(req.xconn,
3097 (char *)outbuf,
3098 true, seqnum+1,
3099 false, &req.pcd);
3100 TALLOC_FREE(outbuf);
3101 if (!ok) {
3102 exit(1);
3103 }
3104
3105 return true;
3106 }
3107
3108 static void smbd_echo_exit(struct tevent_context *ev,
3109 struct tevent_fd *fde, uint16_t flags,
3110 void *private_data)
3111 {
3112 DEBUG(2, ("smbd_echo_exit: lost connection to parent\n"));
3113 exit(0);
3114 }
3115
3116 static void smbd_echo_got_packet(struct tevent_req *req);
3117
3118 static void smbd_echo_loop(struct smbXsrv_connection *xconn,
3119 int parent_pipe)
3120 {
3121 struct smbd_echo_state *state;
3122 struct tevent_req *read_req;
3123
3124 state = talloc_zero(xconn, struct smbd_echo_state);
3125 if (state == NULL) {
3126 DEBUG(1, ("talloc failed\n"));
3127 return;
3128 }
3129 state->xconn = xconn;
3130 state->parent_pipe = parent_pipe;
3131 state->ev = s3_tevent_context_init(state);
3132 if (state->ev == NULL) {
3133 DEBUG(1, ("tevent_context_init failed\n"));
3134 TALLOC_FREE(state);
3135 return;
3136 }
3137 state->parent_fde = tevent_add_fd(state->ev, state, parent_pipe,
3138 TEVENT_FD_READ, smbd_echo_exit,
3139 state);
3140 if (state->parent_fde == NULL) {
3141 DEBUG(1, ("tevent_add_fd failed\n"));
3142 TALLOC_FREE(state);
3143 return;
3144 }
3145
3146 read_req = smbd_echo_read_send(state, state->ev, xconn);
3147 if (read_req == NULL) {
3148 DEBUG(1, ("smbd_echo_read_send failed\n"));
3149 TALLOC_FREE(state);
3150 return;
3151 }
3152 tevent_req_set_callback(read_req, smbd_echo_got_packet, state);
3153
3154 while (true) {
3155 if (tevent_loop_once(state->ev) == -1) {
3156 DEBUG(1, ("tevent_loop_once failed: %s\n",
3157 strerror(errno)));
3158 break;
3159 }
3160 }
3161 TALLOC_FREE(state);
3162 }
3163
3164 static void smbd_echo_got_packet(struct tevent_req *req)
3165 {
3166 struct smbd_echo_state *state = tevent_req_callback_data(
3167 req, struct smbd_echo_state);
3168 NTSTATUS status;
3169 char *buf = NULL;
3170 size_t buflen = 0;
3171 uint32_t seqnum = 0;
3172 bool reply;
3173
3174 status = smbd_echo_read_recv(req, state, &buf, &buflen, &seqnum);
3175 TALLOC_FREE(req);
3176 if (!NT_STATUS_IS_OK(status)) {
3177 DEBUG(1, ("smbd_echo_read_recv returned %s\n",
3178 nt_errstr(status)));
3179 exit(1);
3180 }
3181
3182 reply = smbd_echo_reply(state, (uint8_t *)buf, buflen, seqnum);
3183 if (!reply) {
3184 size_t num_pending;
3185 struct iovec *tmp;
3186 struct iovec *iov;
3187
3188 num_pending = talloc_array_length(state->pending);
3189 tmp = talloc_realloc(state, state->pending, struct iovec,
3190 num_pending+1);
3191 if (tmp == NULL) {
3192 DEBUG(1, ("talloc_realloc failed\n"));
3193 exit(1);
3194 }
3195 state->pending = tmp;
3196
3197 if (buflen >= smb_size) {
3198 /*
3199 * place the seqnum in the packet so that the main process
3200 * can reply with signing
3201 */
3202 SIVAL(buf, smb_ss_field, seqnum);
3203 SIVAL(buf, smb_ss_field+4, NT_STATUS_V(NT_STATUS_OK));
3204 }
3205
3206 iov = &state->pending[num_pending];
3207 iov->iov_base = talloc_move(state->pending, &buf);
3208 iov->iov_len = buflen;
3209
3210 DEBUG(10,("echo_handler[%d]: forward to main\n",
3211 (int)getpid()));
3212 smbd_echo_activate_writer(state);
3213 }
3214
3215 req = smbd_echo_read_send(state, state->ev, state->xconn);
3216 if (req == NULL) {
3217 DEBUG(1, ("smbd_echo_read_send failed\n"));
3218 exit(1);
3219 }
3220 tevent_req_set_callback(req, smbd_echo_got_packet, state);
3221 }
3222
3223
3224 /*
3225 * Handle SMBecho requests in a forked child process
3226 */
3227 bool fork_echo_handler(struct smbXsrv_connection *xconn)
3228 {
3229 int listener_pipe[2];
3230 int res;
3231 pid_t child;
3232 bool use_mutex = false;
3233
3234 res = pipe(listener_pipe);
3235 if (res == -1) {
3236 DEBUG(1, ("pipe() failed: %s\n", strerror(errno)));
3237 return false;
3238 }
3239
3240 #ifdef HAVE_ROBUST_MUTEXES
3241 use_mutex = tdb_runtime_check_for_robust_mutexes();
3242
3243 if (use_mutex) {
3244 pthread_mutexattr_t a;
3245
3246 xconn->smb1.echo_handler.socket_mutex =
3247 anonymous_shared_allocate(sizeof(pthread_mutex_t));
3248 if (xconn->smb1.echo_handler.socket_mutex == NULL) {
3249 DEBUG(1, ("Could not create mutex shared memory: %s\n",
3250 strerror(errno)));
3251 goto fail;
3252 }
3253
3254 res = pthread_mutexattr_init(&a);
3255 if (res != 0) {
3256 DEBUG(1, ("pthread_mutexattr_init failed: %s\n",
3257 strerror(res)));
3258 goto fail;
3259 }
3260 res = pthread_mutexattr_settype(&a, PTHREAD_MUTEX_ERRORCHECK);
3261 if (res != 0) {
3262 DEBUG(1, ("pthread_mutexattr_settype failed: %s\n",
3263 strerror(res)));
3264 pthread_mutexattr_destroy(&a);
3265 goto fail;
3266 }
3267 res = pthread_mutexattr_setpshared(&a, PTHREAD_PROCESS_SHARED);
3268 if (res != 0) {
3269 DEBUG(1, ("pthread_mutexattr_setpshared failed: %s\n",
3270 strerror(res)));
3271 pthread_mutexattr_destroy(&a);
3272 goto fail;
3273 }
3274 res = pthread_mutexattr_setrobust(&a, PTHREAD_MUTEX_ROBUST);
3275 if (res != 0) {
3276 DEBUG(1, ("pthread_mutexattr_setrobust failed: "
3277 "%s\n", strerror(res)));
3278 pthread_mutexattr_destroy(&a);
3279 goto fail;
3280 }
3281 res = pthread_mutex_init(xconn->smb1.echo_handler.socket_mutex,
3282 &a);
3283 pthread_mutexattr_destroy(&a);
3284 if (res != 0) {
3285 DEBUG(1, ("pthread_mutex_init failed: %s\n",
3286 strerror(res)));
3287 goto fail;
3288 }
3289 }
3290 #endif
3291
3292 if (!use_mutex) {
3293 xconn->smb1.echo_handler.socket_lock_fd =
3294 create_unlink_tmp(lp_lock_directory());
3295 if (xconn->smb1.echo_handler.socket_lock_fd == -1) {
3296 DEBUG(1, ("Could not create lock fd: %s\n",
3297 strerror(errno)));
3298 goto fail;
3299 }
3300 }
3301
3302 child = fork();
3303 if (child == 0) {
3304 NTSTATUS status;
3305
3306 close(listener_pipe[0]);
3307 set_blocking(listener_pipe[1], false);
3308
3309 status = smbd_reinit_after_fork(xconn->msg_ctx, xconn->ev_ctx, true);
3310 if (!NT_STATUS_IS_OK(status)) {
3311 DEBUG(1, ("reinit_after_fork failed: %s\n",
3312 nt_errstr(status)));
3313 exit(1);
3314 }
3315 smbd_echo_loop(xconn, listener_pipe[1]);
3316 exit(0);
3317 }
3318 close(listener_pipe[1]);
3319 listener_pipe[1] = -1;
3320 xconn->smb1.echo_handler.trusted_fd = listener_pipe[0];
3321
3322 DEBUG(10,("fork_echo_handler: main[%d] echo_child[%d]\n", (int)getpid(), (int)child));
3323
3324 /*
3325 * Without smb signing this is the same as the normal smbd
3326 * listener. This needs to change once signing comes in.
3327 */
3328 xconn->smb1.echo_handler.trusted_fde = tevent_add_fd(xconn->ev_ctx,
3329 xconn,
3330 xconn->smb1.echo_handler.trusted_fd,
3331 TEVENT_FD_READ,
3332 smbd_server_echo_handler,
3333 xconn);
3334 if (xconn->smb1.echo_handler.trusted_fde == NULL) {
3335 DEBUG(1, ("event_add_fd failed\n"));
3336 goto fail;
3337 }
3338
3339 return true;
3340
3341 fail:
3342 if (listener_pipe[0] != -1) {
3343 close(listener_pipe[0]);
3344 }
3345 if (listener_pipe[1] != -1) {
3346 close(listener_pipe[1]);
3347 }
3348 if (xconn->smb1.echo_handler.socket_lock_fd != -1) {
3349 close(xconn->smb1.echo_handler.socket_lock_fd);
3350 }
3351 #ifdef HAVE_ROBUST_MUTEXES
3352 if (xconn->smb1.echo_handler.socket_mutex != NULL) {
3353 pthread_mutex_destroy(xconn->smb1.echo_handler.socket_mutex);
3354 anonymous_shared_free(xconn->smb1.echo_handler.socket_mutex);
3355 }
3356 #endif
3357 smbd_echo_init(xconn);
3358
3359 return false;
3360 }
3361
3362 static bool uid_in_use(const struct user_struct *user, uid_t uid)
3363 {
3364 while (user) {
3365 if (user->session_info &&
3366 (user->session_info->unix_token->uid == uid)) {
3367 return true;
3368 }
3369 user = user->next;
3370 }
3371 return false;
3372 }
3373
3374 static bool gid_in_use(const struct user_struct *user, gid_t gid)
3375 {
3376 while (user) {
3377 if (user->session_info != NULL) {
3378 int i;
3379 struct security_unix_token *utok;
3380
3381 utok = user->session_info->unix_token;
3382 if (utok->gid == gid) {
3383 return true;
3384 }
3385 for(i=0; i<utok->ngroups; i++) {
3386 if (utok->groups[i] == gid) {
3387 return true;
3388 }
3389 }
3390 }
3391 user = user->next;
3392 }
3393 return false;
3394 }
3395
3396 static bool sid_in_use(const struct user_struct *user,
3397 const struct dom_sid *psid)
3398 {
3399 while (user) {
3400 struct security_token *tok;
3401
3402 if (user->session_info == NULL) {
3403 continue;
3404 }
3405 tok = user->session_info->security_token;
3406 if (tok == NULL) {
3407 /*
3408 * Not sure session_info->security_token can
3409 * ever be NULL. This check might be not
3410 * necessary.
3411 */
3412 continue;
3413 }
3414 if (security_token_has_sid(tok, psid)) {
3415 return true;
3416 }
3417 user = user->next;
3418 }
3419 return false;
3420 }
3421
3422 static bool id_in_use(const struct user_struct *user,
3423 const struct id_cache_ref *id)
3424 {
3425 switch(id->type) {
3426 case UID:
3427 return uid_in_use(user, id->id.uid);
3428 case GID:
3429 return gid_in_use(user, id->id.gid);
3430 case SID:
3431 return sid_in_use(user, &id->id.sid);
3432 default:
3433 break;
3434 }
3435 return false;
3436 }
3437
3438 static void smbd_id_cache_kill(struct messaging_context *msg_ctx,
3439 void *private_data,
3440 uint32_t msg_type,
3441 struct server_id server_id,
3442 DATA_BLOB* data)
3443 {
3444 const char *msg = (data && data->data)
3445 ? (const char *)data->data : "<NULL>";
3446 struct id_cache_ref id;
3447 struct smbd_server_connection *sconn =
3448 talloc_get_type_abort(private_data,
3449 struct smbd_server_connection);
3450
3451 if (!id_cache_ref_parse(msg, &id)) {
3452 DEBUG(0, ("Invalid ?ID: %s\n", msg));
3453 return;
3454 }
3455
3456 if (id_in_use(sconn->users, &id)) {
3457 exit_server_cleanly(msg);
3458 }
3459 id_cache_delete_from_cache(&id);
3460 }
3461
3462 NTSTATUS smbXsrv_connection_init_tables(struct smbXsrv_connection *conn,
3463 enum protocol_types protocol)
3464 {
3465 NTSTATUS status;
3466
3467 conn->protocol = protocol;
3468
3469 if (protocol >= PROTOCOL_SMB2_02) {
3470 status = smb2srv_session_table_init(conn);
3471 if (!NT_STATUS_IS_OK(status)) {
3472 conn->protocol = PROTOCOL_NONE;
3473 return status;
3474 }
3475
3476 status = smb2srv_open_table_init(conn);
3477 if (!NT_STATUS_IS_OK(status)) {
3478 conn->protocol = PROTOCOL_NONE;
3479 return status;
3480 }
3481 } else {
3482 status = smb1srv_session_table_init(conn);
3483 if (!NT_STATUS_IS_OK(status)) {
3484 conn->protocol = PROTOCOL_NONE;
3485 return status;
3486 }
3487
3488 status = smb1srv_tcon_table_init(conn);
3489 if (!NT_STATUS_IS_OK(status)) {
3490 conn->protocol = PROTOCOL_NONE;
3491 return status;
3492 }
3493
3494 status = smb1srv_open_table_init(conn);
3495 if (!NT_STATUS_IS_OK(status)) {
3496 conn->protocol = PROTOCOL_NONE;
3497 return status;
3498 }
3499 }
3500
3501 set_Protocol(protocol);
3502 return NT_STATUS_OK;
3503 }
3504
3505 struct smbd_tevent_trace_state {
3506 struct tevent_context *ev;
3507 TALLOC_CTX *frame;
3508 SMBPROFILE_BASIC_ASYNC_STATE(profile_idle);
3509 };
3510
3511 static void smbd_tevent_trace_callback(enum tevent_trace_point point,
3512 void *private_data)
3513 {
3514 struct smbd_tevent_trace_state *state =
3515 (struct smbd_tevent_trace_state *)private_data;
3516
3517 switch (point) {
3518 case TEVENT_TRACE_BEFORE_WAIT:
3519 if (!smbprofile_dump_pending()) {
3520 /*
3521 * If there's no dump pending
3522 * we don't want to schedule a new 1 sec timer.
3523 *
3524 * Instead we want to sleep as long as nothing happens.
3525 */
3526 smbprofile_dump_setup(NULL);
3527 }
3528 SMBPROFILE_BASIC_ASYNC_START(idle, profile_p, state->profile_idle);
3529 break;
3530 case TEVENT_TRACE_AFTER_WAIT:
3531 SMBPROFILE_BASIC_ASYNC_END(state->profile_idle);
3532 if (!smbprofile_dump_pending()) {
3533 /*
3534 * We need to flush our state after sleeping
3535 * (hopefully a long time).
3536 */
3537 smbprofile_dump();
3538 /*
3539 * future profiling events should trigger timers
3540 * on our main event context.
3541 */
3542 smbprofile_dump_setup(state->ev);
3543 }
3544 break;
3545 case TEVENT_TRACE_BEFORE_LOOP_ONCE:
3546 TALLOC_FREE(state->frame);
3547 state->frame = talloc_stackframe_pool(8192);
3548 break;
3549 case TEVENT_TRACE_AFTER_LOOP_ONCE:
3550 TALLOC_FREE(state->frame);
3551 break;
3552 }
3553
3554 errno = 0;
3555 }
3556
3557 /**
3558 * Create a debug string for the connection
3559 *
3560 * This is allocated to talloc_tos() or a string constant
3561 * in certain corner cases. The returned string should
3562 * hence not be free'd directly but only via the talloc stack.
3563 */
3564 const char *smbXsrv_connection_dbg(const struct smbXsrv_connection *xconn)
3565 {
3566 const char *ret;
3567
3568 /*
3569 * TODO: this can be improved later
3570 * maybe including the client guid or more
3571 */
3572 ret = tsocket_address_string(xconn->remote_address, talloc_tos());
3573 if (ret == NULL) {
3574 return "<tsocket_address_string() failed>";
3575 }
3576
3577 return ret;
3578 }
3579
3580 NTSTATUS smbd_add_connection(struct smbXsrv_client *client, int sock_fd,
3581 struct smbXsrv_connection **_xconn)
3582 {
3583 TALLOC_CTX *frame = talloc_stackframe();
3584 struct smbXsrv_connection *xconn;
3585 struct sockaddr_storage ss_srv;
3586 void *sp_srv = (void *)&ss_srv;
3587 struct sockaddr *sa_srv = (struct sockaddr *)sp_srv;
3588 struct sockaddr_storage ss_clnt;
3589 void *sp_clnt = (void *)&ss_clnt;
3590 struct sockaddr *sa_clnt = (struct sockaddr *)sp_clnt;
3591 socklen_t sa_socklen;
3592 struct tsocket_address *local_address = NULL;
3593 struct tsocket_address *remote_address = NULL;
3594 const char *remaddr = NULL;
3595 char *p;
3596 const char *rhost = NULL;
3597 int ret;
3598 int tmp;
3599
3600 *_xconn = NULL;
3601
3602 DO_PROFILE_INC(connect);
3603
3604 xconn = talloc_zero(client, struct smbXsrv_connection);
3605 if (xconn == NULL) {
3606 DEBUG(0,("talloc_zero(struct smbXsrv_connection)\n"));
3607 TALLOC_FREE(frame);
3608 return NT_STATUS_NO_MEMORY;
3609 }
3610 talloc_steal(frame, xconn);
3611
3612 xconn->ev_ctx = client->ev_ctx;
3613 xconn->msg_ctx = client->msg_ctx;
3614 xconn->transport.sock = sock_fd;
3615 smbd_echo_init(xconn);
3616 xconn->protocol = PROTOCOL_NONE;
3617
3618 /* Ensure child is set to blocking mode */
3619 set_blocking(sock_fd,True);
3620
3621 set_socket_options(sock_fd, "SO_KEEPALIVE");
3622 set_socket_options(sock_fd, lp_socket_options());
3623
3624 sa_socklen = sizeof(ss_clnt);
3625 ret = getpeername(sock_fd, sa_clnt, &sa_socklen);
3626 if (ret != 0) {
3627 int saved_errno = errno;
3628 int level = (errno == ENOTCONN)?2:0;
3629 DEBUG(level,("getpeername() failed - %s\n",
3630 strerror(saved_errno)));
3631 TALLOC_FREE(frame);
3632 return map_nt_error_from_unix_common(saved_errno);
3633 }
3634 ret = tsocket_address_bsd_from_sockaddr(xconn,
3635 sa_clnt, sa_socklen,
3636 &remote_address);
3637 if (ret != 0) {
3638 int saved_errno = errno;
3639 DEBUG(0,("%s: tsocket_address_bsd_from_sockaddr remote failed - %s\n",
3640 __location__, strerror(saved_errno)));
3641 TALLOC_FREE(frame);
3642 return map_nt_error_from_unix_common(saved_errno);
3643 }
3644
3645 sa_socklen = sizeof(ss_srv);
3646 ret = getsockname(sock_fd, sa_srv, &sa_socklen);
3647 if (ret != 0) {
3648 int saved_errno = errno;
3649 int level = (errno == ENOTCONN)?2:0;
3650 DEBUG(level,("getsockname() failed - %s\n",
3651 strerror(saved_errno)));
3652 TALLOC_FREE(frame);
3653 return map_nt_error_from_unix_common(saved_errno);
3654 }
3655 ret = tsocket_address_bsd_from_sockaddr(xconn,
3656 sa_srv, sa_socklen,
3657 &local_address);
3658 if (ret != 0) {
3659 int saved_errno = errno;
3660 DEBUG(0,("%s: tsocket_address_bsd_from_sockaddr remote failed - %s\n",
3661 __location__, strerror(saved_errno)));
3662 TALLOC_FREE(frame);
3663 return map_nt_error_from_unix_common(saved_errno);
3664 }
3665
3666 if (tsocket_address_is_inet(remote_address, "ip")) {
3667 remaddr = tsocket_address_inet_addr_string(remote_address,
3668 talloc_tos());
3669 if (remaddr == NULL) {
3670 DEBUG(0,("%s: tsocket_address_inet_addr_string remote failed - %s\n",
3671 __location__, strerror(errno)));
3672 TALLOC_FREE(frame);
3673 return NT_STATUS_NO_MEMORY;
3674 }
3675 } else {
3676 remaddr = "0.0.0.0";
3677 }
3678
3679 /*
3680 * Before the first packet, check the global hosts allow/ hosts deny
3681 * parameters before doing any parsing of packets passed to us by the
3682 * client. This prevents attacks on our parsing code from hosts not in
3683 * the hosts allow list.
3684 */
3685
3686 ret = get_remote_hostname(remote_address,
3687 &p, talloc_tos());
3688 if (ret < 0) {
3689 int saved_errno = errno;
3690 DEBUG(0,("%s: get_remote_hostname failed - %s\n",
3691 __location__, strerror(saved_errno)));
3692 TALLOC_FREE(frame);
3693 return map_nt_error_from_unix_common(saved_errno);
3694 }
3695 rhost = p;
3696 if (strequal(rhost, "UNKNOWN")) {
3697 rhost = remaddr;
3698 }
3699
3700 xconn->local_address = local_address;
3701 xconn->remote_address = remote_address;
3702 xconn->remote_hostname = talloc_strdup(xconn, rhost);
3703 if (xconn->remote_hostname == NULL) {
3704 return NT_STATUS_NO_MEMORY;
3705 }
3706
3707 if (!srv_init_signing(xconn)) {
3708 DEBUG(0, ("Failed to init smb_signing\n"));
3709 TALLOC_FREE(frame);
3710 return NT_STATUS_INTERNAL_ERROR;
3711 }
3712
3713 if (!allow_access(lp_hosts_deny(-1), lp_hosts_allow(-1),
3714 xconn->remote_hostname,
3715 remaddr)) {
3716 DEBUG( 1, ("Connection denied from %s to %s\n",
3717 tsocket_address_string(remote_address, talloc_tos()),
3718 tsocket_address_string(local_address, talloc_tos())));
3719
3720 /*
3721 * We return a valid xconn
3722 * so that the caller can return an error message
3723 * to the client
3724 */
3725 client->connections = xconn;
3726 xconn->client = client;
3727 talloc_steal(client, xconn);
3728
3729 *_xconn = xconn;
3730 TALLOC_FREE(frame);
3731 return NT_STATUS_NETWORK_ACCESS_DENIED;
3732 }
3733
3734 DEBUG(10, ("Connection allowed from %s to %s\n",
3735 tsocket_address_string(remote_address, talloc_tos()),
3736 tsocket_address_string(local_address, talloc_tos())));
3737
3738 if (lp_clustering()) {
3739 /*
3740 * We need to tell ctdb about our client's TCP
3741 * connection, so that for failover ctdbd can send
3742 * tickle acks, triggering a reconnection by the
3743 * client.
3744 */
3745 NTSTATUS status;
3746
3747 status = smbd_register_ips(xconn, &ss_srv, &ss_clnt);
3748 if (!NT_STATUS_IS_OK(status)) {
3749 DEBUG(0, ("ctdbd_register_ips failed: %s\n",
3750 nt_errstr(status)));
3751 }
3752 }
3753
3754 tmp = lp_max_xmit();
3755 tmp = MAX(tmp, SMB_BUFFER_SIZE_MIN);
3756 tmp = MIN(tmp, SMB_BUFFER_SIZE_MAX);
3757
3758 xconn->smb1.negprot.max_recv = tmp;
3759
3760 xconn->smb1.sessions.done_sesssetup = false;
3761 xconn->smb1.sessions.max_send = SMB_BUFFER_SIZE_MAX;
3762
3763 xconn->transport.fde = tevent_add_fd(client->ev_ctx,
3764 xconn,
3765 sock_fd,
3766 TEVENT_FD_READ,
3767 smbd_server_connection_handler,
3768 xconn);
3769 if (!xconn->transport.fde) {
3770 TALLOC_FREE(frame);
3771 return NT_STATUS_NO_MEMORY;
3772 }
3773
3774 /* for now we only have one connection */
3775 DLIST_ADD_END(client->connections, xconn, NULL);
3776 xconn->client = client;
3777 talloc_steal(client, xconn);
3778
3779 *_xconn = xconn;
3780 TALLOC_FREE(frame);
3781 return NT_STATUS_OK;
3782 }
3783
3784 /****************************************************************************
3785 Process commands from the client
3786 ****************************************************************************/
3787
3788 void smbd_process(struct tevent_context *ev_ctx,
3789 struct messaging_context *msg_ctx,
3790 int sock_fd,
3791 bool interactive)
3792 {
3793 struct smbd_tevent_trace_state trace_state = {
3794 .ev = ev_ctx,
3795 .frame = talloc_stackframe(),
3796 };
3797 struct smbXsrv_client *client = NULL;
3798 struct smbd_server_connection *sconn = NULL;
3799 struct smbXsrv_connection *xconn = NULL;
3800 const char *locaddr = NULL;
3801 const char *remaddr = NULL;
3802 int ret;
3803 NTSTATUS status;
3804
3805 client = talloc_zero(ev_ctx, struct smbXsrv_client);
3806 if (client == NULL) {
3807 DEBUG(0,("talloc_zero(struct smbXsrv_client)\n"));
3808 exit_server_cleanly("talloc_zero(struct smbXsrv_client).\n");
3809 }
3810
3811 /*
3812 * TODO: remove this...:-)
3813 */
3814 global_smbXsrv_client = client;
3815
3816 client->ev_ctx = ev_ctx;
3817 client->msg_ctx = msg_ctx;
3818
3819 sconn = talloc_zero(client, struct smbd_server_connection);
3820 if (sconn == NULL) {
3821 exit_server("failed to create smbd_server_connection");
3822 }
3823
3824 client->sconn = sconn;
3825 sconn->client = client;
3826
3827 sconn->ev_ctx = ev_ctx;
3828 sconn->msg_ctx = msg_ctx;
3829
3830 if (lp_server_max_protocol() >= PROTOCOL_SMB2_02) {
3831 /*
3832 * We're not making the decision here,
3833 * we're just allowing the client
3834 * to decide between SMB1 and SMB2
3835 * with the first negprot
3836 * packet.
3837 */
3838 sconn->using_smb2 = true;
3839 }
3840
3841 if (!interactive) {
3842 smbd_setup_sig_term_handler(sconn);
3843 smbd_setup_sig_hup_handler(sconn);
3844
3845 if (!serverid_register(messaging_server_id(msg_ctx),
3846 FLAG_MSG_GENERAL|FLAG_MSG_SMBD
3847 |FLAG_MSG_DBWRAP
3848 |FLAG_MSG_PRINT_GENERAL)) {
3849 exit_server_cleanly("Could not register myself in "
3850 "serverid.tdb");
3851 }
3852 }
3853
3854 status = smbd_add_connection(client, sock_fd, &xconn);
3855 if (NT_STATUS_EQUAL(status, NT_STATUS_NETWORK_ACCESS_DENIED)) {
3856 /*
3857 * send a negative session response "not listening on calling
3858 * name"
3859 */
3860 unsigned char buf[5] = {0x83, 0, 0, 1, 0x81};
3861 (void)srv_send_smb(xconn,(char *)buf, false,
3862 0, false, NULL);
3863 exit_server_cleanly("connection denied");
3864 } else if (!NT_STATUS_IS_OK(status)) {
3865 exit_server_cleanly(nt_errstr(status));
3866 }
3867
3868 sconn->local_address =
3869 tsocket_address_copy(xconn->local_address, sconn);
3870 if (sconn->local_address == NULL) {
3871 exit_server_cleanly("tsocket_address_copy() failed");
3872 }
3873 sconn->remote_address =
3874 tsocket_address_copy(xconn->remote_address, sconn);
3875 if (sconn->remote_address == NULL) {
3876 exit_server_cleanly("tsocket_address_copy() failed");
3877 }
3878 sconn->remote_hostname =
3879 talloc_strdup(sconn, xconn->remote_hostname);
3880 if (sconn->remote_hostname == NULL) {
3881 exit_server_cleanly("tsocket_strdup() failed");
3882 }
3883
3884 if (tsocket_address_is_inet(sconn->local_address, "ip")) {
3885 locaddr = tsocket_address_inet_addr_string(
3886 sconn->local_address,
3887 talloc_tos());
3888 if (locaddr == NULL) {
3889 DEBUG(0,("%s: tsocket_address_inet_addr_string remote failed - %s\n",
3890 __location__, strerror(errno)));
3891 exit_server_cleanly("tsocket_address_inet_addr_string remote failed.\n");
3892 }
3893 } else {
3894 locaddr = "0.0.0.0";
3895 }
3896
3897 if (tsocket_address_is_inet(sconn->remote_address, "ip")) {
3898 remaddr = tsocket_address_inet_addr_string(
3899 sconn->remote_address,
3900 talloc_tos());
3901 if (remaddr == NULL) {
3902 DEBUG(0,("%s: tsocket_address_inet_addr_string remote failed - %s\n",
3903 __location__, strerror(errno)));
3904 exit_server_cleanly("tsocket_address_inet_addr_string remote failed.\n");
3905 }
3906 } else {
3907 remaddr = "0.0.0.0";
3908 }
3909
3910 /* this is needed so that we get decent entries
3911 in smbstatus for port 445 connects */
3912 set_remote_machine_name(remaddr, false);
3913 reload_services(sconn, conn_snum_used, true);
3914 sub_set_socket_ids(remaddr,
3915 sconn->remote_hostname,
3916 locaddr);
3917
3918 if (lp_preload_modules()) {
3919 smb_load_modules(lp_preload_modules());
3920 }
3921
3922 smb_perfcount_init();
3923
3924 if (!init_account_policy()) {
3925 exit_server("Could not open account policy tdb.\n");
3926 }
3927
3928 if (*lp_root_directory(talloc_tos())) {
3929 if (chroot(lp_root_directory(talloc_tos())) != 0) {
3930 DEBUG(0,("Failed to change root to %s\n",
3931 lp_root_directory(talloc_tos())));
3932 exit_server("Failed to chroot()");
3933 }
3934 if (chdir("/") == -1) {
3935 DEBUG(0,("Failed to chdir to / on chroot to %s\n", lp_root_directory(talloc_tos())));
3936 exit_server("Failed to chroot()");
3937 }
3938 DEBUG(0,("Changed root to %s\n", lp_root_directory(talloc_tos())));
3939 }
3940
3941 if (!file_init(sconn)) {
3942 exit_server("file_init() failed");
3943 }
3944
3945 /* Setup oplocks */
3946 if (!init_oplocks(sconn))
3947 exit_server("Failed to init oplocks");
3948
3949 /* register our message handlers */
3950 messaging_register(sconn->msg_ctx, sconn,
3951 MSG_SMB_FORCE_TDIS, msg_force_tdis);
3952 messaging_register(sconn->msg_ctx, sconn,
3953 MSG_SMB_CLOSE_FILE, msg_close_file);
3954 messaging_register(sconn->msg_ctx, sconn,
3955 MSG_SMB_FILE_RENAME, msg_file_was_renamed);
3956
3957 id_cache_register_msgs(sconn->msg_ctx);
3958 messaging_deregister(sconn->msg_ctx, ID_CACHE_KILL, NULL);
3959 messaging_register(sconn->msg_ctx, sconn,
3960 ID_CACHE_KILL, smbd_id_cache_kill);
3961
3962 messaging_deregister(sconn->msg_ctx,
3963 MSG_SMB_CONF_UPDATED, sconn->ev_ctx);
3964 messaging_register(sconn->msg_ctx, sconn,
3965 MSG_SMB_CONF_UPDATED, smbd_conf_updated);
3966
3967 messaging_deregister(sconn->msg_ctx, MSG_SMB_KILL_CLIENT_IP,
3968 NULL);
3969 messaging_register(sconn->msg_ctx, sconn,
3970 MSG_SMB_KILL_CLIENT_IP,
3971 msg_kill_client_ip);
3972
3973 messaging_deregister(sconn->msg_ctx, MSG_SMB_TELL_NUM_CHILDREN, NULL);
3974
3975 /*
3976 * Use the default MSG_DEBUG handler to avoid rebroadcasting
3977 * MSGs to all child processes
3978 */
3979 messaging_deregister(sconn->msg_ctx,
3980 MSG_DEBUG, NULL);
3981 messaging_register(sconn->msg_ctx, NULL,
3982 MSG_DEBUG, debug_message);
3983
3984 if ((lp_keepalive() != 0)
3985 && !(event_add_idle(ev_ctx, NULL,
3986 timeval_set(lp_keepalive(), 0),
3987 "keepalive", keepalive_fn,
3988 sconn))) {
3989 DEBUG(0, ("Could not add keepalive event\n"));
3990 exit(1);
3991 }
3992
3993 if (!(event_add_idle(ev_ctx, NULL,
3994 timeval_set(IDLE_CLOSED_TIMEOUT, 0),
3995 "deadtime", deadtime_fn, sconn))) {
3996 DEBUG(0, ("Could not add deadtime event\n"));
3997 exit(1);
3998 }
3999
4000 if (!(event_add_idle(ev_ctx, NULL,
4001 timeval_set(SMBD_HOUSEKEEPING_INTERVAL, 0),
4002 "housekeeping", housekeeping_fn, sconn))) {
4003 DEBUG(0, ("Could not add housekeeping event\n"));
4004 exit(1);
4005 }
4006
4007 smbprofile_dump_setup(ev_ctx);
4008
4009 if (!init_dptrs(sconn)) {
4010 exit_server("init_dptrs() failed");
4011 }
4012
4013 TALLOC_FREE(trace_state.frame);
4014
4015 tevent_set_trace_callback(ev_ctx, smbd_tevent_trace_callback,
4016 &trace_state);
4017
4018 ret = tevent_loop_wait(ev_ctx);
4019 if (ret != 0) {
4020 DEBUG(1, ("tevent_loop_wait failed: %d, %s,"
4021 " exiting\n", ret, strerror(errno)));
4022 }
4023
4024 TALLOC_FREE(trace_state.frame);
4025
4026 exit_server_cleanly(NULL);
4027 }
4028
4029 bool req_is_in_chain(const struct smb_request *req)
4030 {
4031 if (req->vwv != (const uint16_t *)(req->inbuf+smb_vwv)) {
4032 /*
4033 * We're right now handling a subsequent request, so we must
4034 * be in a chain
4035 */
4036 return true;
4037 }
4038
4039 if (!is_andx_req(req->cmd)) {
4040 return false;
4041 }
4042
4043 if (req->wct < 2) {
4044 /*
4045 * Okay, an illegal request, but definitely not chained :-)
4046 */
4047 return false;
4048 }
4049
4050 return (CVAL(req->vwv+0, 0) != 0xFF);
4051 }
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