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winbindd: queryuser - only get group name if needed
[Samba.git] / source3 / smbd / process.c
blob3765739d9c4eaeb35d7b9c3bd9b3c4ebc86eb192
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 "lib/messages_ctdbd.h"
36 #include "smbprofile.h"
37 #include "rpc_server/spoolss/srv_spoolss_nt.h"
38 #include "libsmb/libsmb.h"
39 #include "../lib/util/tevent_ntstatus.h"
40 #include "../libcli/security/dom_sid.h"
41 #include "../libcli/security/security_token.h"
42 #include "lib/id_cache.h"
43 #include "lib/util/sys_rw_data.h"
44 #include "serverid.h"
45 #include "system/threads.h"
46
47 /* Internal message queue for deferred opens. */
48 struct pending_message_list {
49 struct pending_message_list *next, *prev;
50 struct timeval request_time; /* When was this first issued? */
51 struct smbd_server_connection *sconn;
52 struct smbXsrv_connection *xconn;
53 struct tevent_timer *te;
54 struct smb_perfcount_data pcd;
55 uint32_t seqnum;
56 bool encrypted;
57 bool processed;
58 DATA_BLOB buf;
59 struct deferred_open_record *open_rec;
60 };
61
62 static void construct_reply_common(uint8_t cmd, const uint8_t *inbuf,
63 char *outbuf);
64 static struct pending_message_list *get_deferred_open_message_smb(
65 struct smbd_server_connection *sconn, uint64_t mid);
66 static bool smb_splice_chain(uint8_t **poutbuf, const uint8_t *andx_buf);
67
68 static void smbd_echo_init(struct smbXsrv_connection *xconn)
69 {
70 xconn->smb1.echo_handler.trusted_fd = -1;
71 xconn->smb1.echo_handler.socket_lock_fd = -1;
72 #ifdef HAVE_ROBUST_MUTEXES
73 xconn->smb1.echo_handler.socket_mutex = NULL;
74 #endif
75 }
76
77 static bool smbd_echo_active(struct smbXsrv_connection *xconn)
78 {
79 if (xconn->smb1.echo_handler.socket_lock_fd != -1) {
80 return true;
81 }
82
83 #ifdef HAVE_ROBUST_MUTEXES
84 if (xconn->smb1.echo_handler.socket_mutex != NULL) {
85 return true;
86 }
87 #endif
88
89 return false;
90 }
91
92 static bool smbd_lock_socket_internal(struct smbXsrv_connection *xconn)
93 {
94 if (!smbd_echo_active(xconn)) {
95 return true;
96 }
97
98 xconn->smb1.echo_handler.ref_count++;
99
100 if (xconn->smb1.echo_handler.ref_count > 1) {
101 return true;
102 }
103
104 DEBUG(10,("pid[%d] wait for socket lock\n", (int)getpid()));
105
106 #ifdef HAVE_ROBUST_MUTEXES
107 if (xconn->smb1.echo_handler.socket_mutex != NULL) {
108 int ret = EINTR;
109
110 while (ret == EINTR) {
111 ret = pthread_mutex_lock(
112 xconn->smb1.echo_handler.socket_mutex);
113 if (ret == 0) {
114 break;
115 }
116 }
117 if (ret != 0) {
118 DEBUG(1, ("pthread_mutex_lock failed: %s\n",
119 strerror(ret)));
120 return false;
121 }
122 }
123 #endif
124
125 if (xconn->smb1.echo_handler.socket_lock_fd != -1) {
126 bool ok;
127
128 do {
129 ok = fcntl_lock(
130 xconn->smb1.echo_handler.socket_lock_fd,
131 F_SETLKW, 0, 0, F_WRLCK);
132 } while (!ok && (errno == EINTR));
133
134 if (!ok) {
135 DEBUG(1, ("fcntl_lock failed: %s\n", strerror(errno)));
136 return false;
137 }
138 }
139
140 DEBUG(10,("pid[%d] got socket lock\n", (int)getpid()));
141
142 return true;
143 }
144
145 void smbd_lock_socket(struct smbXsrv_connection *xconn)
146 {
147 if (!smbd_lock_socket_internal(xconn)) {
148 exit_server_cleanly("failed to lock socket");
149 }
150 }
151
152 static bool smbd_unlock_socket_internal(struct smbXsrv_connection *xconn)
153 {
154 if (!smbd_echo_active(xconn)) {
155 return true;
156 }
157
158 xconn->smb1.echo_handler.ref_count--;
159
160 if (xconn->smb1.echo_handler.ref_count > 0) {
161 return true;
162 }
163
164 #ifdef HAVE_ROBUST_MUTEXES
165 if (xconn->smb1.echo_handler.socket_mutex != NULL) {
166 int ret = EINTR;
167
168 while (ret == EINTR) {
169 ret = pthread_mutex_unlock(
170 xconn->smb1.echo_handler.socket_mutex);
171 if (ret == 0) {
172 break;
173 }
174 }
175 if (ret != 0) {
176 DEBUG(1, ("pthread_mutex_unlock failed: %s\n",
177 strerror(ret)));
178 return false;
179 }
180 }
181 #endif
182
183 if (xconn->smb1.echo_handler.socket_lock_fd != -1) {
184 bool ok;
185
186 do {
187 ok = fcntl_lock(
188 xconn->smb1.echo_handler.socket_lock_fd,
189 F_SETLKW, 0, 0, F_UNLCK);
190 } while (!ok && (errno == EINTR));
191
192 if (!ok) {
193 DEBUG(1, ("fcntl_lock failed: %s\n", strerror(errno)));
194 return false;
195 }
196 }
197
198 DEBUG(10,("pid[%d] unlocked socket\n", (int)getpid()));
199
200 return true;
201 }
202
203 void smbd_unlock_socket(struct smbXsrv_connection *xconn)
204 {
205 if (!smbd_unlock_socket_internal(xconn)) {
206 exit_server_cleanly("failed to unlock socket");
207 }
208 }
209
210 /* Accessor function for smb_read_error for smbd functions. */
211
212 /****************************************************************************
213 Send an smb to a fd.
214 ****************************************************************************/
215
216 bool srv_send_smb(struct smbXsrv_connection *xconn, char *buffer,
217 bool do_signing, uint32_t seqnum,
218 bool do_encrypt,
219 struct smb_perfcount_data *pcd)
220 {
221 size_t len = 0;
222 ssize_t ret;
223 char *buf_out = buffer;
224
225 if (!NT_STATUS_IS_OK(xconn->transport.status)) {
226 /*
227 * we're not supposed to do any io
228 */
229 return true;
230 }
231
232 smbd_lock_socket(xconn);
233
234 if (do_signing) {
235 /* Sign the outgoing packet if required. */
236 srv_calculate_sign_mac(xconn, buf_out, seqnum);
237 }
238
239 if (do_encrypt) {
240 NTSTATUS status = srv_encrypt_buffer(xconn, buffer, &buf_out);
241 if (!NT_STATUS_IS_OK(status)) {
242 DEBUG(0, ("send_smb: SMB encryption failed "
243 "on outgoing packet! Error %s\n",
244 nt_errstr(status) ));
245 ret = -1;
246 goto out;
247 }
248 }
249
250 len = smb_len_large(buf_out) + 4;
251
252 ret = write_data(xconn->transport.sock, buf_out, len);
253 if (ret <= 0) {
254 int saved_errno = errno;
255 /*
256 * Try and give an error message saying what
257 * client failed.
258 */
259 DEBUG(1,("pid[%d] Error writing %d bytes to client %s. %d. (%s)\n",
260 (int)getpid(), (int)len,
261 smbXsrv_connection_dbg(xconn),
262 (int)ret, strerror(saved_errno)));
263 errno = saved_errno;
264
265 srv_free_enc_buffer(xconn, buf_out);
266 goto out;
267 }
268
269 SMB_PERFCOUNT_SET_MSGLEN_OUT(pcd, len);
270 srv_free_enc_buffer(xconn, buf_out);
271 out:
272 SMB_PERFCOUNT_END(pcd);
273
274 smbd_unlock_socket(xconn);
275 return (ret > 0);
276 }
277
278 /*******************************************************************
279 Setup the word count and byte count for a smb message.
280 ********************************************************************/
281
282 int srv_set_message(char *buf,
283 int num_words,
284 int num_bytes,
285 bool zero)
286 {
287 if (zero && (num_words || num_bytes)) {
288 memset(buf + smb_size,'\0',num_words*2 + num_bytes);
289 }
290 SCVAL(buf,smb_wct,num_words);
291 SSVAL(buf,smb_vwv + num_words*SIZEOFWORD,num_bytes);
292 smb_setlen(buf,(smb_size + num_words*2 + num_bytes - 4));
293 return (smb_size + num_words*2 + num_bytes);
294 }
295
296 static bool valid_smb_header(const uint8_t *inbuf)
297 {
298 if (is_encrypted_packet(inbuf)) {
299 return true;
300 }
301 /*
302 * This used to be (strncmp(smb_base(inbuf),"\377SMB",4) == 0)
303 * but it just looks weird to call strncmp for this one.
304 */
305 return (IVAL(smb_base(inbuf), 0) == 0x424D53FF);
306 }
307
308 /* Socket functions for smbd packet processing. */
309
310 static bool valid_packet_size(size_t len)
311 {
312 /*
313 * A WRITEX with CAP_LARGE_WRITEX can be 64k worth of data plus 65 bytes
314 * of header. Don't print the error if this fits.... JRA.
315 */
316
317 if (len > (LARGE_WRITEX_BUFFER_SIZE + LARGE_WRITEX_HDR_SIZE)) {
318 DEBUG(0,("Invalid packet length! (%lu bytes).\n",
319 (unsigned long)len));
320 return false;
321 }
322 return true;
323 }
324
325 static NTSTATUS read_packet_remainder(int fd, char *buffer,
326 unsigned int timeout, ssize_t len)
327 {
328 NTSTATUS status;
329
330 if (len <= 0) {
331 return NT_STATUS_OK;
332 }
333
334 status = read_fd_with_timeout(fd, buffer, len, len, timeout, NULL);
335 if (!NT_STATUS_IS_OK(status)) {
336 char addr[INET6_ADDRSTRLEN];
337 DEBUG(0, ("read_fd_with_timeout failed for client %s read "
338 "error = %s.\n",
339 get_peer_addr(fd, addr, sizeof(addr)),
340 nt_errstr(status)));
341 }
342 return status;
343 }
344
345 /****************************************************************************
346 Attempt a zerocopy writeX read. We know here that len > smb_size-4
347 ****************************************************************************/
348
349 /*
350 * Unfortunately, earlier versions of smbclient/libsmbclient
351 * don't send this "standard" writeX header. I've fixed this
352 * for 3.2 but we'll use the old method with earlier versions.
353 * Windows and CIFSFS at least use this standard size. Not
354 * sure about MacOSX.
355 */
356
357 #define STANDARD_WRITE_AND_X_HEADER_SIZE (smb_size - 4 + /* basic header */ \
358 (2*14) + /* word count (including bcc) */ \
359 1 /* pad byte */)
360
361 static NTSTATUS receive_smb_raw_talloc_partial_read(TALLOC_CTX *mem_ctx,
362 const char lenbuf[4],
363 struct smbXsrv_connection *xconn,
364 int sock,
365 char **buffer,
366 unsigned int timeout,
367 size_t *p_unread,
368 size_t *len_ret)
369 {
370 /* Size of a WRITEX call (+4 byte len). */
371 char writeX_header[4 + STANDARD_WRITE_AND_X_HEADER_SIZE];
372 ssize_t len = smb_len_large(lenbuf); /* Could be a UNIX large writeX. */
373 ssize_t toread;
374 NTSTATUS status;
375
376 memcpy(writeX_header, lenbuf, 4);
377
378 status = read_fd_with_timeout(
379 sock, writeX_header + 4,
380 STANDARD_WRITE_AND_X_HEADER_SIZE,
381 STANDARD_WRITE_AND_X_HEADER_SIZE,
382 timeout, NULL);
383
384 if (!NT_STATUS_IS_OK(status)) {
385 DEBUG(0, ("read_fd_with_timeout failed for client %s read "
386 "error = %s.\n",
387 smbXsrv_connection_dbg(xconn),
388 nt_errstr(status)));
389 return status;
390 }
391
392 /*
393 * Ok - now try and see if this is a possible
394 * valid writeX call.
395 */
396
397 if (is_valid_writeX_buffer(xconn, (uint8_t *)writeX_header)) {
398 /*
399 * If the data offset is beyond what
400 * we've read, drain the extra bytes.
401 */
402 uint16_t doff = SVAL(writeX_header,smb_vwv11);
403 ssize_t newlen;
404
405 if (doff > STANDARD_WRITE_AND_X_HEADER_SIZE) {
406 size_t drain = doff - STANDARD_WRITE_AND_X_HEADER_SIZE;
407 if (drain_socket(sock, drain) != drain) {
408 smb_panic("receive_smb_raw_talloc_partial_read:"
409 " failed to drain pending bytes");
410 }
411 } else {
412 doff = STANDARD_WRITE_AND_X_HEADER_SIZE;
413 }
414
415 /* Spoof down the length and null out the bcc. */
416 set_message_bcc(writeX_header, 0);
417 newlen = smb_len(writeX_header);
418
419 /* Copy the header we've written. */
420
421 *buffer = (char *)talloc_memdup(mem_ctx,
422 writeX_header,
423 sizeof(writeX_header));
424
425 if (*buffer == NULL) {
426 DEBUG(0, ("Could not allocate inbuf of length %d\n",
427 (int)sizeof(writeX_header)));
428 return NT_STATUS_NO_MEMORY;
429 }
430
431 /* Work out the remaining bytes. */
432 *p_unread = len - STANDARD_WRITE_AND_X_HEADER_SIZE;
433 *len_ret = newlen + 4;
434 return NT_STATUS_OK;
435 }
436
437 if (!valid_packet_size(len)) {
438 return NT_STATUS_INVALID_PARAMETER;
439 }
440
441 /*
442 * Not a valid writeX call. Just do the standard
443 * talloc and return.
444 */
445
446 *buffer = talloc_array(mem_ctx, char, len+4);
447
448 if (*buffer == NULL) {
449 DEBUG(0, ("Could not allocate inbuf of length %d\n",
450 (int)len+4));
451 return NT_STATUS_NO_MEMORY;
452 }
453
454 /* Copy in what we already read. */
455 memcpy(*buffer,
456 writeX_header,
457 4 + STANDARD_WRITE_AND_X_HEADER_SIZE);
458 toread = len - STANDARD_WRITE_AND_X_HEADER_SIZE;
459
460 if(toread > 0) {
461 status = read_packet_remainder(
462 sock,
463 (*buffer) + 4 + STANDARD_WRITE_AND_X_HEADER_SIZE,
464 timeout, toread);
465
466 if (!NT_STATUS_IS_OK(status)) {
467 DEBUG(10, ("receive_smb_raw_talloc_partial_read: %s\n",
468 nt_errstr(status)));
469 return status;
470 }
471 }
472
473 *len_ret = len + 4;
474 return NT_STATUS_OK;
475 }
476
477 static NTSTATUS receive_smb_raw_talloc(TALLOC_CTX *mem_ctx,
478 struct smbXsrv_connection *xconn,
479 int sock,
480 char **buffer, unsigned int timeout,
481 size_t *p_unread, size_t *plen)
482 {
483 char lenbuf[4];
484 size_t len;
485 int min_recv_size = lp_min_receive_file_size();
486 NTSTATUS status;
487
488 *p_unread = 0;
489
490 status = read_smb_length_return_keepalive(sock, lenbuf, timeout,
491 &len);
492 if (!NT_STATUS_IS_OK(status)) {
493 return status;
494 }
495
496 if (CVAL(lenbuf,0) == 0 && min_recv_size &&
497 (smb_len_large(lenbuf) > /* Could be a UNIX large writeX. */
498 (min_recv_size + STANDARD_WRITE_AND_X_HEADER_SIZE)) &&
499 !srv_is_signing_active(xconn) &&
500 xconn->smb1.echo_handler.trusted_fde == NULL) {
501
502 return receive_smb_raw_talloc_partial_read(
503 mem_ctx, lenbuf, xconn, sock, buffer, timeout,
504 p_unread, plen);
505 }
506
507 if (!valid_packet_size(len)) {
508 return NT_STATUS_INVALID_PARAMETER;
509 }
510
511 /*
512 * The +4 here can't wrap, we've checked the length above already.
513 */
514
515 *buffer = talloc_array(mem_ctx, char, len+4);
516
517 if (*buffer == NULL) {
518 DEBUG(0, ("Could not allocate inbuf of length %d\n",
519 (int)len+4));
520 return NT_STATUS_NO_MEMORY;
521 }
522
523 memcpy(*buffer, lenbuf, sizeof(lenbuf));
524
525 status = read_packet_remainder(sock, (*buffer)+4, timeout, len);
526 if (!NT_STATUS_IS_OK(status)) {
527 return status;
528 }
529
530 *plen = len + 4;
531 return NT_STATUS_OK;
532 }
533
534 static NTSTATUS receive_smb_talloc(TALLOC_CTX *mem_ctx,
535 struct smbXsrv_connection *xconn,
536 int sock,
537 char **buffer, unsigned int timeout,
538 size_t *p_unread, bool *p_encrypted,
539 size_t *p_len,
540 uint32_t *seqnum,
541 bool trusted_channel)
542 {
543 size_t len = 0;
544 NTSTATUS status;
545
546 *p_encrypted = false;
547
548 status = receive_smb_raw_talloc(mem_ctx, xconn, sock, buffer, timeout,
549 p_unread, &len);
550 if (!NT_STATUS_IS_OK(status)) {
551 DEBUG(NT_STATUS_EQUAL(status, NT_STATUS_END_OF_FILE)?5:1,
552 ("receive_smb_raw_talloc failed for client %s "
553 "read error = %s.\n",
554 smbXsrv_connection_dbg(xconn),
555 nt_errstr(status)) );
556 return status;
557 }
558
559 if (is_encrypted_packet((uint8_t *)*buffer)) {
560 status = srv_decrypt_buffer(xconn, *buffer);
561 if (!NT_STATUS_IS_OK(status)) {
562 DEBUG(0, ("receive_smb_talloc: SMB decryption failed on "
563 "incoming packet! Error %s\n",
564 nt_errstr(status) ));
565 return status;
566 }
567 *p_encrypted = true;
568 }
569
570 /* Check the incoming SMB signature. */
571 if (!srv_check_sign_mac(xconn, *buffer, seqnum, trusted_channel)) {
572 DEBUG(0, ("receive_smb: SMB Signature verification failed on "
573 "incoming packet!\n"));
574 return NT_STATUS_INVALID_NETWORK_RESPONSE;
575 }
576
577 *p_len = len;
578 return NT_STATUS_OK;
579 }
580
581 /*
582 * Initialize a struct smb_request from an inbuf
583 */
584
585 static bool init_smb_request(struct smb_request *req,
586 struct smbd_server_connection *sconn,
587 struct smbXsrv_connection *xconn,
588 const uint8_t *inbuf,
589 size_t unread_bytes, bool encrypted,
590 uint32_t seqnum)
591 {
592 struct smbXsrv_tcon *tcon;
593 NTSTATUS status;
594 NTTIME now;
595 size_t req_size = smb_len(inbuf) + 4;
596
597 /* Ensure we have at least smb_size bytes. */
598 if (req_size < smb_size) {
599 DEBUG(0,("init_smb_request: invalid request size %u\n",
600 (unsigned int)req_size ));
601 return false;
602 }
603
604 req->request_time = timeval_current();
605 now = timeval_to_nttime(&req->request_time);
606
607 req->cmd = CVAL(inbuf, smb_com);
608 req->flags2 = SVAL(inbuf, smb_flg2);
609 req->smbpid = SVAL(inbuf, smb_pid);
610 req->mid = (uint64_t)SVAL(inbuf, smb_mid);
611 req->seqnum = seqnum;
612 req->vuid = SVAL(inbuf, smb_uid);
613 req->tid = SVAL(inbuf, smb_tid);
614 req->wct = CVAL(inbuf, smb_wct);
615 req->vwv = (const uint16_t *)(inbuf+smb_vwv);
616 req->buflen = smb_buflen(inbuf);
617 req->buf = (const uint8_t *)smb_buf_const(inbuf);
618 req->unread_bytes = unread_bytes;
619 req->encrypted = encrypted;
620 req->sconn = sconn;
621 req->xconn = xconn;
622 req->conn = NULL;
623 if (xconn != NULL) {
624 status = smb1srv_tcon_lookup(xconn, req->tid, now, &tcon);
625 if (NT_STATUS_IS_OK(status)) {
626 req->conn = tcon->compat;
627 }
628 }
629 req->chain_fsp = NULL;
630 req->smb2req = NULL;
631 req->priv_paths = NULL;
632 req->chain = NULL;
633 req->posix_pathnames = lp_posix_pathnames();
634 smb_init_perfcount_data(&req->pcd);
635
636 /* Ensure we have at least wct words and 2 bytes of bcc. */
637 if (smb_size + req->wct*2 > req_size) {
638 DEBUG(0,("init_smb_request: invalid wct number %u (size %u)\n",
639 (unsigned int)req->wct,
640 (unsigned int)req_size));
641 return false;
642 }
643 /* Ensure bcc is correct. */
644 if (((const uint8_t *)smb_buf_const(inbuf)) + req->buflen > inbuf + req_size) {
645 DEBUG(0,("init_smb_request: invalid bcc number %u "
646 "(wct = %u, size %u)\n",
647 (unsigned int)req->buflen,
648 (unsigned int)req->wct,
649 (unsigned int)req_size));
650 return false;
651 }
652
653 req->outbuf = NULL;
654 return true;
655 }
656
657 static void process_smb(struct smbXsrv_connection *xconn,
658 uint8_t *inbuf, size_t nread, size_t unread_bytes,
659 uint32_t seqnum, bool encrypted,
660 struct smb_perfcount_data *deferred_pcd);
661
662 static void smbd_deferred_open_timer(struct tevent_context *ev,
663 struct tevent_timer *te,
664 struct timeval _tval,
665 void *private_data)
666 {
667 struct pending_message_list *msg = talloc_get_type(private_data,
668 struct pending_message_list);
669 struct smbd_server_connection *sconn = msg->sconn;
670 struct smbXsrv_connection *xconn = msg->xconn;
671 TALLOC_CTX *mem_ctx = talloc_tos();
672 uint64_t mid = (uint64_t)SVAL(msg->buf.data,smb_mid);
673 uint8_t *inbuf;
674
675 inbuf = (uint8_t *)talloc_memdup(mem_ctx, msg->buf.data,
676 msg->buf.length);
677 if (inbuf == NULL) {
678 exit_server("smbd_deferred_open_timer: talloc failed\n");
679 return;
680 }
681
682 /* We leave this message on the queue so the open code can
683 know this is a retry. */
684 DEBUG(5,("smbd_deferred_open_timer: trigger mid %llu.\n",
685 (unsigned long long)mid ));
686
687 /* Mark the message as processed so this is not
688 * re-processed in error. */
689 msg->processed = true;
690
691 process_smb(xconn, inbuf,
692 msg->buf.length, 0,
693 msg->seqnum, msg->encrypted, &msg->pcd);
694
695 /* If it's still there and was processed, remove it. */
696 msg = get_deferred_open_message_smb(sconn, mid);
697 if (msg && msg->processed) {
698 remove_deferred_open_message_smb(xconn, mid);
699 }
700 }
701
702 /****************************************************************************
703 Function to push a message onto the tail of a linked list of smb messages ready
704 for processing.
705 ****************************************************************************/
706
707 static bool push_queued_message(struct smb_request *req,
708 struct timeval request_time,
709 struct timeval end_time,
710 struct deferred_open_record *open_rec)
711 {
712 int msg_len = smb_len(req->inbuf) + 4;
713 struct pending_message_list *msg;
714
715 msg = talloc_zero(NULL, struct pending_message_list);
716
717 if(msg == NULL) {
718 DEBUG(0,("push_message: malloc fail (1)\n"));
719 return False;
720 }
721 msg->sconn = req->sconn;
722 msg->xconn = req->xconn;
723
724 msg->buf = data_blob_talloc(msg, req->inbuf, msg_len);
725 if(msg->buf.data == NULL) {
726 DEBUG(0,("push_message: malloc fail (2)\n"));
727 TALLOC_FREE(msg);
728 return False;
729 }
730
731 msg->request_time = request_time;
732 msg->seqnum = req->seqnum;
733 msg->encrypted = req->encrypted;
734 msg->processed = false;
735 SMB_PERFCOUNT_DEFER_OP(&req->pcd, &msg->pcd);
736
737 if (open_rec) {
738 msg->open_rec = talloc_move(msg, &open_rec);
739 }
740
741 #if 0
742 msg->te = tevent_add_timer(msg->sconn->ev_ctx,
743 msg,
744 end_time,
745 smbd_deferred_open_timer,
746 msg);
747 if (!msg->te) {
748 DEBUG(0,("push_message: event_add_timed failed\n"));
749 TALLOC_FREE(msg);
750 return false;
751 }
752 #endif
753
754 DLIST_ADD_END(req->sconn->deferred_open_queue, msg);
755
756 DEBUG(10,("push_message: pushed message length %u on "
757 "deferred_open_queue\n", (unsigned int)msg_len));
758
759 return True;
760 }
761
762 /****************************************************************************
763 Function to delete a sharing violation open message by mid.
764 ****************************************************************************/
765
766 void remove_deferred_open_message_smb(struct smbXsrv_connection *xconn,
767 uint64_t mid)
768 {
769 struct smbd_server_connection *sconn = xconn->client->sconn;
770 struct pending_message_list *pml;
771
772 if (sconn->using_smb2) {
773 remove_deferred_open_message_smb2(xconn, mid);
774 return;
775 }
776
777 for (pml = sconn->deferred_open_queue; pml; pml = pml->next) {
778 if (mid == (uint64_t)SVAL(pml->buf.data,smb_mid)) {
779 DEBUG(10,("remove_deferred_open_message_smb: "
780 "deleting mid %llu len %u\n",
781 (unsigned long long)mid,
782 (unsigned int)pml->buf.length ));
783 DLIST_REMOVE(sconn->deferred_open_queue, pml);
784 TALLOC_FREE(pml);
785 return;
786 }
787 }
788 }
789
790 /****************************************************************************
791 Move a sharing violation open retry message to the front of the list and
792 schedule it for immediate processing.
793 ****************************************************************************/
794
795 bool schedule_deferred_open_message_smb(struct smbXsrv_connection *xconn,
796 uint64_t mid)
797 {
798 struct smbd_server_connection *sconn = xconn->client->sconn;
799 struct pending_message_list *pml;
800 int i = 0;
801
802 if (sconn->using_smb2) {
803 return schedule_deferred_open_message_smb2(xconn, mid);
804 }
805
806 for (pml = sconn->deferred_open_queue; pml; pml = pml->next) {
807 uint64_t msg_mid = (uint64_t)SVAL(pml->buf.data,smb_mid);
808
809 DEBUG(10,("schedule_deferred_open_message_smb: [%d] "
810 "msg_mid = %llu\n",
811 i++,
812 (unsigned long long)msg_mid ));
813
814 if (mid == msg_mid) {
815 struct tevent_timer *te;
816
817 if (pml->processed) {
818 /* A processed message should not be
819 * rescheduled. */
820 DEBUG(0,("schedule_deferred_open_message_smb: LOGIC ERROR "
821 "message mid %llu was already processed\n",
822 (unsigned long long)msg_mid ));
823 continue;
824 }
825
826 DEBUG(10,("schedule_deferred_open_message_smb: "
827 "scheduling mid %llu\n",
828 (unsigned long long)mid ));
829
830 te = tevent_add_timer(pml->sconn->ev_ctx,
831 pml,
832 timeval_zero(),
833 smbd_deferred_open_timer,
834 pml);
835 if (!te) {
836 DEBUG(10,("schedule_deferred_open_message_smb: "
837 "event_add_timed() failed, "
838 "skipping mid %llu\n",
839 (unsigned long long)msg_mid ));
840 }
841
842 TALLOC_FREE(pml->te);
843 pml->te = te;
844 DLIST_PROMOTE(sconn->deferred_open_queue, pml);
845 return true;
846 }
847 }
848
849 DEBUG(10,("schedule_deferred_open_message_smb: failed to "
850 "find message mid %llu\n",
851 (unsigned long long)mid ));
852
853 return false;
854 }
855
856 /****************************************************************************
857 Return true if this mid is on the deferred queue and was not yet processed.
858 ****************************************************************************/
859
860 bool open_was_deferred(struct smbXsrv_connection *xconn, uint64_t mid)
861 {
862 struct smbd_server_connection *sconn = xconn->client->sconn;
863 struct pending_message_list *pml;
864
865 if (sconn->using_smb2) {
866 return open_was_deferred_smb2(xconn, mid);
867 }
868
869 for (pml = sconn->deferred_open_queue; pml; pml = pml->next) {
870 if (((uint64_t)SVAL(pml->buf.data,smb_mid)) == mid && !pml->processed) {
871 return True;
872 }
873 }
874 return False;
875 }
876
877 /****************************************************************************
878 Return the message queued by this mid.
879 ****************************************************************************/
880
881 static struct pending_message_list *get_deferred_open_message_smb(
882 struct smbd_server_connection *sconn, uint64_t mid)
883 {
884 struct pending_message_list *pml;
885
886 for (pml = sconn->deferred_open_queue; pml; pml = pml->next) {
887 if (((uint64_t)SVAL(pml->buf.data,smb_mid)) == mid) {
888 return pml;
889 }
890 }
891 return NULL;
892 }
893
894 /****************************************************************************
895 Get the state data queued by this mid.
896 ****************************************************************************/
897
898 bool get_deferred_open_message_state(struct smb_request *smbreq,
899 struct timeval *p_request_time,
900 struct deferred_open_record **open_rec)
901 {
902 struct pending_message_list *pml;
903
904 if (smbreq->sconn->using_smb2) {
905 return get_deferred_open_message_state_smb2(smbreq->smb2req,
906 p_request_time,
907 open_rec);
908 }
909
910 pml = get_deferred_open_message_smb(smbreq->sconn, smbreq->mid);
911 if (!pml) {
912 return false;
913 }
914 if (p_request_time) {
915 *p_request_time = pml->request_time;
916 }
917 if (open_rec != NULL) {
918 *open_rec = pml->open_rec;
919 }
920 return true;
921 }
922
923 /****************************************************************************
924 Function to push a deferred open smb message onto a linked list of local smb
925 messages ready for processing.
926 ****************************************************************************/
927
928 bool push_deferred_open_message_smb(struct smb_request *req,
929 struct timeval request_time,
930 struct timeval timeout,
931 struct file_id id,
932 struct deferred_open_record *open_rec)
933 {
934 struct timeval end_time;
935
936 if (req->smb2req) {
937 return push_deferred_open_message_smb2(req->smb2req,
938 request_time,
939 timeout,
940 id,
941 open_rec);
942 }
943
944 if (req->unread_bytes) {
945 DEBUG(0,("push_deferred_open_message_smb: logic error ! "
946 "unread_bytes = %u\n",
947 (unsigned int)req->unread_bytes ));
948 smb_panic("push_deferred_open_message_smb: "
949 "logic error unread_bytes != 0" );
950 }
951
952 end_time = timeval_sum(&request_time, &timeout);
953
954 DEBUG(10,("push_deferred_open_message_smb: pushing message "
955 "len %u mid %llu timeout time [%u.%06u]\n",
956 (unsigned int) smb_len(req->inbuf)+4,
957 (unsigned long long)req->mid,
958 (unsigned int)end_time.tv_sec,
959 (unsigned int)end_time.tv_usec));
960
961 return push_queued_message(req, request_time, end_time, open_rec);
962 }
963
964 static void smbd_sig_term_handler(struct tevent_context *ev,
965 struct tevent_signal *se,
966 int signum,
967 int count,
968 void *siginfo,
969 void *private_data)
970 {
971 exit_server_cleanly("termination signal");
972 }
973
974 void smbd_setup_sig_term_handler(struct smbd_server_connection *sconn)
975 {
976 struct tevent_signal *se;
977
978 se = tevent_add_signal(sconn->ev_ctx,
979 sconn,
980 SIGTERM, 0,
981 smbd_sig_term_handler,
982 sconn);
983 if (!se) {
984 exit_server("failed to setup SIGTERM handler");
985 }
986 }
987
988 static void smbd_sig_hup_handler(struct tevent_context *ev,
989 struct tevent_signal *se,
990 int signum,
991 int count,
992 void *siginfo,
993 void *private_data)
994 {
995 struct smbd_server_connection *sconn =
996 talloc_get_type_abort(private_data,
997 struct smbd_server_connection);
998
999 change_to_root_user();
1000 DEBUG(1,("Reloading services after SIGHUP\n"));
1001 reload_services(sconn, conn_snum_used, false);
1002 }
1003
1004 void smbd_setup_sig_hup_handler(struct smbd_server_connection *sconn)
1005 {
1006 struct tevent_signal *se;
1007
1008 se = tevent_add_signal(sconn->ev_ctx,
1009 sconn,
1010 SIGHUP, 0,
1011 smbd_sig_hup_handler,
1012 sconn);
1013 if (!se) {
1014 exit_server("failed to setup SIGHUP handler");
1015 }
1016 }
1017
1018 static void smbd_conf_updated(struct messaging_context *msg,
1019 void *private_data,
1020 uint32_t msg_type,
1021 struct server_id server_id,
1022 DATA_BLOB *data)
1023 {
1024 struct smbd_server_connection *sconn =
1025 talloc_get_type_abort(private_data,
1026 struct smbd_server_connection);
1027
1028 DEBUG(10,("smbd_conf_updated: Got message saying smb.conf was "
1029 "updated. Reloading.\n"));
1030 change_to_root_user();
1031 reload_services(sconn, conn_snum_used, false);
1032 }
1033
1034 /*
1035 * Only allow 5 outstanding trans requests. We're allocating memory, so
1036 * prevent a DoS.
1037 */
1038
1039 NTSTATUS allow_new_trans(struct trans_state *list, uint64_t mid)
1040 {
1041 int count = 0;
1042 for (; list != NULL; list = list->next) {
1043
1044 if (list->mid == mid) {
1045 return NT_STATUS_INVALID_PARAMETER;
1046 }
1047
1048 count += 1;
1049 }
1050 if (count > 5) {
1051 return NT_STATUS_INSUFFICIENT_RESOURCES;
1052 }
1053
1054 return NT_STATUS_OK;
1055 }
1056
1057 /*
1058 These flags determine some of the permissions required to do an operation
1059
1060 Note that I don't set NEED_WRITE on some write operations because they
1061 are used by some brain-dead clients when printing, and I don't want to
1062 force write permissions on print services.
1063 */
1064 #define AS_USER (1<<0)
1065 #define NEED_WRITE (1<<1) /* Must be paired with AS_USER */
1066 #define TIME_INIT (1<<2)
1067 #define CAN_IPC (1<<3) /* Must be paired with AS_USER */
1068 #define AS_GUEST (1<<5) /* Must *NOT* be paired with AS_USER */
1069 #define DO_CHDIR (1<<6)
1070
1071 /*
1072 define a list of possible SMB messages and their corresponding
1073 functions. Any message that has a NULL function is unimplemented -
1074 please feel free to contribute implementations!
1075 */
1076 static const struct smb_message_struct {
1077 const char *name;
1078 void (*fn)(struct smb_request *req);
1079 int flags;
1080 } smb_messages[256] = {
1081
1082 /* 0x00 */ { "SMBmkdir",reply_mkdir,AS_USER | NEED_WRITE},
1083 /* 0x01 */ { "SMBrmdir",reply_rmdir,AS_USER | NEED_WRITE},
1084 /* 0x02 */ { "SMBopen",reply_open,AS_USER },
1085 /* 0x03 */ { "SMBcreate",reply_mknew,AS_USER},
1086 /* 0x04 */ { "SMBclose",reply_close,AS_USER | CAN_IPC },
1087 /* 0x05 */ { "SMBflush",reply_flush,AS_USER},
1088 /* 0x06 */ { "SMBunlink",reply_unlink,AS_USER | NEED_WRITE },
1089 /* 0x07 */ { "SMBmv",reply_mv,AS_USER | NEED_WRITE },
1090 /* 0x08 */ { "SMBgetatr",reply_getatr,AS_USER},
1091 /* 0x09 */ { "SMBsetatr",reply_setatr,AS_USER | NEED_WRITE},
1092 /* 0x0a */ { "SMBread",reply_read,AS_USER},
1093 /* 0x0b */ { "SMBwrite",reply_write,AS_USER | CAN_IPC },
1094 /* 0x0c */ { "SMBlock",reply_lock,AS_USER},
1095 /* 0x0d */ { "SMBunlock",reply_unlock,AS_USER},
1096 /* 0x0e */ { "SMBctemp",reply_ctemp,AS_USER },
1097 /* 0x0f */ { "SMBmknew",reply_mknew,AS_USER},
1098 /* 0x10 */ { "SMBcheckpath",reply_checkpath,AS_USER},
1099 /* 0x11 */ { "SMBexit",reply_exit,DO_CHDIR},
1100 /* 0x12 */ { "SMBlseek",reply_lseek,AS_USER},
1101 /* 0x13 */ { "SMBlockread",reply_lockread,AS_USER},
1102 /* 0x14 */ { "SMBwriteunlock",reply_writeunlock,AS_USER},
1103 /* 0x15 */ { NULL, NULL, 0 },
1104 /* 0x16 */ { NULL, NULL, 0 },
1105 /* 0x17 */ { NULL, NULL, 0 },
1106 /* 0x18 */ { NULL, NULL, 0 },
1107 /* 0x19 */ { NULL, NULL, 0 },
1108 /* 0x1a */ { "SMBreadbraw",reply_readbraw,AS_USER},
1109 /* 0x1b */ { "SMBreadBmpx",reply_readbmpx,AS_USER},
1110 /* 0x1c */ { "SMBreadBs",reply_readbs,AS_USER },
1111 /* 0x1d */ { "SMBwritebraw",reply_writebraw,AS_USER},
1112 /* 0x1e */ { "SMBwriteBmpx",reply_writebmpx,AS_USER},
1113 /* 0x1f */ { "SMBwriteBs",reply_writebs,AS_USER},
1114 /* 0x20 */ { "SMBwritec", NULL,0},
1115 /* 0x21 */ { NULL, NULL, 0 },
1116 /* 0x22 */ { "SMBsetattrE",reply_setattrE,AS_USER | NEED_WRITE },
1117 /* 0x23 */ { "SMBgetattrE",reply_getattrE,AS_USER },
1118 /* 0x24 */ { "SMBlockingX",reply_lockingX,AS_USER },
1119 /* 0x25 */ { "SMBtrans",reply_trans,AS_USER | CAN_IPC },
1120 /* 0x26 */ { "SMBtranss",reply_transs,AS_USER | CAN_IPC},
1121 /* 0x27 */ { "SMBioctl",reply_ioctl,0},
1122 /* 0x28 */ { "SMBioctls", NULL,AS_USER},
1123 /* 0x29 */ { "SMBcopy",reply_copy,AS_USER | NEED_WRITE },
1124 /* 0x2a */ { "SMBmove", NULL,AS_USER | NEED_WRITE },
1125 /* 0x2b */ { "SMBecho",reply_echo,0},
1126 /* 0x2c */ { "SMBwriteclose",reply_writeclose,AS_USER},
1127 /* 0x2d */ { "SMBopenX",reply_open_and_X,AS_USER | CAN_IPC },
1128 /* 0x2e */ { "SMBreadX",reply_read_and_X,AS_USER | CAN_IPC },
1129 /* 0x2f */ { "SMBwriteX",reply_write_and_X,AS_USER | CAN_IPC },
1130 /* 0x30 */ { NULL, NULL, 0 },
1131 /* 0x31 */ { NULL, NULL, 0 },
1132 /* 0x32 */ { "SMBtrans2",reply_trans2, AS_USER | CAN_IPC },
1133 /* 0x33 */ { "SMBtranss2",reply_transs2, AS_USER | CAN_IPC },
1134 /* 0x34 */ { "SMBfindclose",reply_findclose,AS_USER},
1135 /* 0x35 */ { "SMBfindnclose",reply_findnclose,AS_USER},
1136 /* 0x36 */ { NULL, NULL, 0 },
1137 /* 0x37 */ { NULL, NULL, 0 },
1138 /* 0x38 */ { NULL, NULL, 0 },
1139 /* 0x39 */ { NULL, NULL, 0 },
1140 /* 0x3a */ { NULL, NULL, 0 },
1141 /* 0x3b */ { NULL, NULL, 0 },
1142 /* 0x3c */ { NULL, NULL, 0 },
1143 /* 0x3d */ { NULL, NULL, 0 },
1144 /* 0x3e */ { NULL, NULL, 0 },
1145 /* 0x3f */ { NULL, NULL, 0 },
1146 /* 0x40 */ { NULL, NULL, 0 },
1147 /* 0x41 */ { NULL, NULL, 0 },
1148 /* 0x42 */ { NULL, NULL, 0 },
1149 /* 0x43 */ { NULL, NULL, 0 },
1150 /* 0x44 */ { NULL, NULL, 0 },
1151 /* 0x45 */ { NULL, NULL, 0 },
1152 /* 0x46 */ { NULL, NULL, 0 },
1153 /* 0x47 */ { NULL, NULL, 0 },
1154 /* 0x48 */ { NULL, NULL, 0 },
1155 /* 0x49 */ { NULL, NULL, 0 },
1156 /* 0x4a */ { NULL, NULL, 0 },
1157 /* 0x4b */ { NULL, NULL, 0 },
1158 /* 0x4c */ { NULL, NULL, 0 },
1159 /* 0x4d */ { NULL, NULL, 0 },
1160 /* 0x4e */ { NULL, NULL, 0 },
1161 /* 0x4f */ { NULL, NULL, 0 },
1162 /* 0x50 */ { NULL, NULL, 0 },
1163 /* 0x51 */ { NULL, NULL, 0 },
1164 /* 0x52 */ { NULL, NULL, 0 },
1165 /* 0x53 */ { NULL, NULL, 0 },
1166 /* 0x54 */ { NULL, NULL, 0 },
1167 /* 0x55 */ { NULL, NULL, 0 },
1168 /* 0x56 */ { NULL, NULL, 0 },
1169 /* 0x57 */ { NULL, NULL, 0 },
1170 /* 0x58 */ { NULL, NULL, 0 },
1171 /* 0x59 */ { NULL, NULL, 0 },
1172 /* 0x5a */ { NULL, NULL, 0 },
1173 /* 0x5b */ { NULL, NULL, 0 },
1174 /* 0x5c */ { NULL, NULL, 0 },
1175 /* 0x5d */ { NULL, NULL, 0 },
1176 /* 0x5e */ { NULL, NULL, 0 },
1177 /* 0x5f */ { NULL, NULL, 0 },
1178 /* 0x60 */ { NULL, NULL, 0 },
1179 /* 0x61 */ { NULL, NULL, 0 },
1180 /* 0x62 */ { NULL, NULL, 0 },
1181 /* 0x63 */ { NULL, NULL, 0 },
1182 /* 0x64 */ { NULL, NULL, 0 },
1183 /* 0x65 */ { NULL, NULL, 0 },
1184 /* 0x66 */ { NULL, NULL, 0 },
1185 /* 0x67 */ { NULL, NULL, 0 },
1186 /* 0x68 */ { NULL, NULL, 0 },
1187 /* 0x69 */ { NULL, NULL, 0 },
1188 /* 0x6a */ { NULL, NULL, 0 },
1189 /* 0x6b */ { NULL, NULL, 0 },
1190 /* 0x6c */ { NULL, NULL, 0 },
1191 /* 0x6d */ { NULL, NULL, 0 },
1192 /* 0x6e */ { NULL, NULL, 0 },
1193 /* 0x6f */ { NULL, NULL, 0 },
1194 /* 0x70 */ { "SMBtcon",reply_tcon,0},
1195 /* 0x71 */ { "SMBtdis",reply_tdis,DO_CHDIR},
1196 /* 0x72 */ { "SMBnegprot",reply_negprot,0},
1197 /* 0x73 */ { "SMBsesssetupX",reply_sesssetup_and_X,0},
1198 /* 0x74 */ { "SMBulogoffX",reply_ulogoffX, 0}, /* ulogoff doesn't give a valid TID */
1199 /* 0x75 */ { "SMBtconX",reply_tcon_and_X,0},
1200 /* 0x76 */ { NULL, NULL, 0 },
1201 /* 0x77 */ { NULL, NULL, 0 },
1202 /* 0x78 */ { NULL, NULL, 0 },
1203 /* 0x79 */ { NULL, NULL, 0 },
1204 /* 0x7a */ { NULL, NULL, 0 },
1205 /* 0x7b */ { NULL, NULL, 0 },
1206 /* 0x7c */ { NULL, NULL, 0 },
1207 /* 0x7d */ { NULL, NULL, 0 },
1208 /* 0x7e */ { NULL, NULL, 0 },
1209 /* 0x7f */ { NULL, NULL, 0 },
1210 /* 0x80 */ { "SMBdskattr",reply_dskattr,AS_USER},
1211 /* 0x81 */ { "SMBsearch",reply_search,AS_USER},
1212 /* 0x82 */ { "SMBffirst",reply_search,AS_USER},
1213 /* 0x83 */ { "SMBfunique",reply_search,AS_USER},
1214 /* 0x84 */ { "SMBfclose",reply_fclose,AS_USER},
1215 /* 0x85 */ { NULL, NULL, 0 },
1216 /* 0x86 */ { NULL, NULL, 0 },
1217 /* 0x87 */ { NULL, NULL, 0 },
1218 /* 0x88 */ { NULL, NULL, 0 },
1219 /* 0x89 */ { NULL, NULL, 0 },
1220 /* 0x8a */ { NULL, NULL, 0 },
1221 /* 0x8b */ { NULL, NULL, 0 },
1222 /* 0x8c */ { NULL, NULL, 0 },
1223 /* 0x8d */ { NULL, NULL, 0 },
1224 /* 0x8e */ { NULL, NULL, 0 },
1225 /* 0x8f */ { NULL, NULL, 0 },
1226 /* 0x90 */ { NULL, NULL, 0 },
1227 /* 0x91 */ { NULL, NULL, 0 },
1228 /* 0x92 */ { NULL, NULL, 0 },
1229 /* 0x93 */ { NULL, NULL, 0 },
1230 /* 0x94 */ { NULL, NULL, 0 },
1231 /* 0x95 */ { NULL, NULL, 0 },
1232 /* 0x96 */ { NULL, NULL, 0 },
1233 /* 0x97 */ { NULL, NULL, 0 },
1234 /* 0x98 */ { NULL, NULL, 0 },
1235 /* 0x99 */ { NULL, NULL, 0 },
1236 /* 0x9a */ { NULL, NULL, 0 },
1237 /* 0x9b */ { NULL, NULL, 0 },
1238 /* 0x9c */ { NULL, NULL, 0 },
1239 /* 0x9d */ { NULL, NULL, 0 },
1240 /* 0x9e */ { NULL, NULL, 0 },
1241 /* 0x9f */ { NULL, NULL, 0 },
1242 /* 0xa0 */ { "SMBnttrans",reply_nttrans, AS_USER | CAN_IPC },
1243 /* 0xa1 */ { "SMBnttranss",reply_nttranss, AS_USER | CAN_IPC },
1244 /* 0xa2 */ { "SMBntcreateX",reply_ntcreate_and_X, AS_USER | CAN_IPC },
1245 /* 0xa3 */ { NULL, NULL, 0 },
1246 /* 0xa4 */ { "SMBntcancel",reply_ntcancel, 0 },
1247 /* 0xa5 */ { "SMBntrename",reply_ntrename, AS_USER | NEED_WRITE },
1248 /* 0xa6 */ { NULL, NULL, 0 },
1249 /* 0xa7 */ { NULL, NULL, 0 },
1250 /* 0xa8 */ { NULL, NULL, 0 },
1251 /* 0xa9 */ { NULL, NULL, 0 },
1252 /* 0xaa */ { NULL, NULL, 0 },
1253 /* 0xab */ { NULL, NULL, 0 },
1254 /* 0xac */ { NULL, NULL, 0 },
1255 /* 0xad */ { NULL, NULL, 0 },
1256 /* 0xae */ { NULL, NULL, 0 },
1257 /* 0xaf */ { NULL, NULL, 0 },
1258 /* 0xb0 */ { NULL, NULL, 0 },
1259 /* 0xb1 */ { NULL, NULL, 0 },
1260 /* 0xb2 */ { NULL, NULL, 0 },
1261 /* 0xb3 */ { NULL, NULL, 0 },
1262 /* 0xb4 */ { NULL, NULL, 0 },
1263 /* 0xb5 */ { NULL, NULL, 0 },
1264 /* 0xb6 */ { NULL, NULL, 0 },
1265 /* 0xb7 */ { NULL, NULL, 0 },
1266 /* 0xb8 */ { NULL, NULL, 0 },
1267 /* 0xb9 */ { NULL, NULL, 0 },
1268 /* 0xba */ { NULL, NULL, 0 },
1269 /* 0xbb */ { NULL, NULL, 0 },
1270 /* 0xbc */ { NULL, NULL, 0 },
1271 /* 0xbd */ { NULL, NULL, 0 },
1272 /* 0xbe */ { NULL, NULL, 0 },
1273 /* 0xbf */ { NULL, NULL, 0 },
1274 /* 0xc0 */ { "SMBsplopen",reply_printopen,AS_USER},
1275 /* 0xc1 */ { "SMBsplwr",reply_printwrite,AS_USER},
1276 /* 0xc2 */ { "SMBsplclose",reply_printclose,AS_USER},
1277 /* 0xc3 */ { "SMBsplretq",reply_printqueue,AS_USER},
1278 /* 0xc4 */ { NULL, NULL, 0 },
1279 /* 0xc5 */ { NULL, NULL, 0 },
1280 /* 0xc6 */ { NULL, NULL, 0 },
1281 /* 0xc7 */ { NULL, NULL, 0 },
1282 /* 0xc8 */ { NULL, NULL, 0 },
1283 /* 0xc9 */ { NULL, NULL, 0 },
1284 /* 0xca */ { NULL, NULL, 0 },
1285 /* 0xcb */ { NULL, NULL, 0 },
1286 /* 0xcc */ { NULL, NULL, 0 },
1287 /* 0xcd */ { NULL, NULL, 0 },
1288 /* 0xce */ { NULL, NULL, 0 },
1289 /* 0xcf */ { NULL, NULL, 0 },
1290 /* 0xd0 */ { "SMBsends",reply_sends,AS_GUEST},
1291 /* 0xd1 */ { "SMBsendb", NULL,AS_GUEST},
1292 /* 0xd2 */ { "SMBfwdname", NULL,AS_GUEST},
1293 /* 0xd3 */ { "SMBcancelf", NULL,AS_GUEST},
1294 /* 0xd4 */ { "SMBgetmac", NULL,AS_GUEST},
1295 /* 0xd5 */ { "SMBsendstrt",reply_sendstrt,AS_GUEST},
1296 /* 0xd6 */ { "SMBsendend",reply_sendend,AS_GUEST},
1297 /* 0xd7 */ { "SMBsendtxt",reply_sendtxt,AS_GUEST},
1298 /* 0xd8 */ { NULL, NULL, 0 },
1299 /* 0xd9 */ { NULL, NULL, 0 },
1300 /* 0xda */ { NULL, NULL, 0 },
1301 /* 0xdb */ { NULL, NULL, 0 },
1302 /* 0xdc */ { NULL, NULL, 0 },
1303 /* 0xdd */ { NULL, NULL, 0 },
1304 /* 0xde */ { NULL, NULL, 0 },
1305 /* 0xdf */ { NULL, NULL, 0 },
1306 /* 0xe0 */ { NULL, NULL, 0 },
1307 /* 0xe1 */ { NULL, NULL, 0 },
1308 /* 0xe2 */ { NULL, NULL, 0 },
1309 /* 0xe3 */ { NULL, NULL, 0 },
1310 /* 0xe4 */ { NULL, NULL, 0 },
1311 /* 0xe5 */ { NULL, NULL, 0 },
1312 /* 0xe6 */ { NULL, NULL, 0 },
1313 /* 0xe7 */ { NULL, NULL, 0 },
1314 /* 0xe8 */ { NULL, NULL, 0 },
1315 /* 0xe9 */ { NULL, NULL, 0 },
1316 /* 0xea */ { NULL, NULL, 0 },
1317 /* 0xeb */ { NULL, NULL, 0 },
1318 /* 0xec */ { NULL, NULL, 0 },
1319 /* 0xed */ { NULL, NULL, 0 },
1320 /* 0xee */ { NULL, NULL, 0 },
1321 /* 0xef */ { NULL, NULL, 0 },
1322 /* 0xf0 */ { NULL, NULL, 0 },
1323 /* 0xf1 */ { NULL, NULL, 0 },
1324 /* 0xf2 */ { NULL, NULL, 0 },
1325 /* 0xf3 */ { NULL, NULL, 0 },
1326 /* 0xf4 */ { NULL, NULL, 0 },
1327 /* 0xf5 */ { NULL, NULL, 0 },
1328 /* 0xf6 */ { NULL, NULL, 0 },
1329 /* 0xf7 */ { NULL, NULL, 0 },
1330 /* 0xf8 */ { NULL, NULL, 0 },
1331 /* 0xf9 */ { NULL, NULL, 0 },
1332 /* 0xfa */ { NULL, NULL, 0 },
1333 /* 0xfb */ { NULL, NULL, 0 },
1334 /* 0xfc */ { NULL, NULL, 0 },
1335 /* 0xfd */ { NULL, NULL, 0 },
1336 /* 0xfe */ { NULL, NULL, 0 },
1337 /* 0xff */ { NULL, NULL, 0 }
1338
1339 };
1340
1341 /*******************************************************************
1342 allocate and initialize a reply packet
1343 ********************************************************************/
1344
1345 static bool create_outbuf(TALLOC_CTX *mem_ctx, struct smb_request *req,
1346 const uint8_t *inbuf, char **outbuf,
1347 uint8_t num_words, uint32_t num_bytes)
1348 {
1349 size_t smb_len = MIN_SMB_SIZE + VWV(num_words) + num_bytes;
1350
1351 /*
1352 * Protect against integer wrap.
1353 * The SMB layer reply can be up to 0xFFFFFF bytes.
1354 */
1355 if ((num_bytes > 0xffffff) || (smb_len > 0xffffff)) {
1356 char *msg;
1357 if (asprintf(&msg, "num_bytes too large: %u",
1358 (unsigned)num_bytes) == -1) {
1359 msg = discard_const_p(char, "num_bytes too large");
1360 }
1361 smb_panic(msg);
1362 }
1363
1364 /*
1365 * Here we include the NBT header for now.
1366 */
1367 *outbuf = talloc_array(mem_ctx, char,
1368 NBT_HDR_SIZE + smb_len);
1369 if (*outbuf == NULL) {
1370 return false;
1371 }
1372
1373 construct_reply_common(req->cmd, inbuf, *outbuf);
1374 srv_set_message(*outbuf, num_words, num_bytes, false);
1375 /*
1376 * Zero out the word area, the caller has to take care of the bcc area
1377 * himself
1378 */
1379 if (num_words != 0) {
1380 memset(*outbuf + (NBT_HDR_SIZE + HDR_VWV), 0, VWV(num_words));
1381 }
1382
1383 return true;
1384 }
1385
1386 void reply_outbuf(struct smb_request *req, uint8_t num_words, uint32_t num_bytes)
1387 {
1388 char *outbuf;
1389 if (!create_outbuf(req, req, req->inbuf, &outbuf, num_words,
1390 num_bytes)) {
1391 smb_panic("could not allocate output buffer\n");
1392 }
1393 req->outbuf = (uint8_t *)outbuf;
1394 }
1395
1396
1397 /*******************************************************************
1398 Dump a packet to a file.
1399 ********************************************************************/
1400
1401 static void smb_dump(const char *name, int type, const char *data)
1402 {
1403 size_t len;
1404 int fd, i;
1405 char *fname = NULL;
1406 if (DEBUGLEVEL < 50) {
1407 return;
1408 }
1409
1410 len = smb_len_tcp(data)+4;
1411 for (i=1;i<100;i++) {
1412 fname = talloc_asprintf(talloc_tos(),
1413 "/tmp/%s.%d.%s",
1414 name,
1415 i,
1416 type ? "req" : "resp");
1417 if (fname == NULL) {
1418 return;
1419 }
1420 fd = open(fname, O_WRONLY|O_CREAT|O_EXCL, 0644);
1421 if (fd != -1 || errno != EEXIST) break;
1422 TALLOC_FREE(fname);
1423 }
1424 if (fd != -1) {
1425 ssize_t ret = write(fd, data, len);
1426 if (ret != len)
1427 DEBUG(0,("smb_dump: problem: write returned %d\n", (int)ret ));
1428 close(fd);
1429 DEBUG(0,("created %s len %lu\n", fname, (unsigned long)len));
1430 }
1431 TALLOC_FREE(fname);
1432 }
1433
1434 static void smb1srv_update_crypto_flags(struct smbXsrv_session *session,
1435 struct smb_request *req,
1436 uint8_t type,
1437 bool *update_session_globalp,
1438 bool *update_tcon_globalp)
1439 {
1440 connection_struct *conn = req->conn;
1441 struct smbXsrv_tcon *tcon = conn ? conn->tcon : NULL;
1442 uint8_t encrypt_flag = SMBXSRV_PROCESSED_UNENCRYPTED_PACKET;
1443 uint8_t sign_flag = SMBXSRV_PROCESSED_UNSIGNED_PACKET;
1444 bool update_session = false;
1445 bool update_tcon = false;
1446
1447 if (req->encrypted) {
1448 encrypt_flag = SMBXSRV_PROCESSED_ENCRYPTED_PACKET;
1449 }
1450
1451 if (srv_is_signing_active(req->xconn)) {
1452 sign_flag = SMBXSRV_PROCESSED_SIGNED_PACKET;
1453 } else if ((type == SMBecho) || (type == SMBsesssetupX)) {
1454 /*
1455 * echo can be unsigned. Sesssion setup except final
1456 * session setup response too
1457 */
1458 sign_flag &= ~SMBXSRV_PROCESSED_UNSIGNED_PACKET;
1459 }
1460
1461 update_session |= smbXsrv_set_crypto_flag(
1462 &session->global->encryption_flags, encrypt_flag);
1463 update_session |= smbXsrv_set_crypto_flag(
1464 &session->global->signing_flags, sign_flag);
1465
1466 if (tcon) {
1467 update_tcon |= smbXsrv_set_crypto_flag(
1468 &tcon->global->encryption_flags, encrypt_flag);
1469 update_tcon |= smbXsrv_set_crypto_flag(
1470 &tcon->global->signing_flags, sign_flag);
1471 }
1472
1473 if (update_session) {
1474 session->global->channels[0].encryption_cipher = SMB_ENCRYPTION_GSSAPI;
1475 }
1476
1477 *update_session_globalp = update_session;
1478 *update_tcon_globalp = update_tcon;
1479 return;
1480 }
1481
1482 /****************************************************************************
1483 Prepare everything for calling the actual request function, and potentially
1484 call the request function via the "new" interface.
1485
1486 Return False if the "legacy" function needs to be called, everything is
1487 prepared.
1488
1489 Return True if we're done.
1490
1491 I know this API sucks, but it is the one with the least code change I could
1492 find.
1493 ****************************************************************************/
1494
1495 static connection_struct *switch_message(uint8_t type, struct smb_request *req)
1496 {
1497 int flags;
1498 uint64_t session_tag;
1499 connection_struct *conn = NULL;
1500 struct smbXsrv_connection *xconn = req->xconn;
1501 NTTIME now = timeval_to_nttime(&req->request_time);
1502 struct smbXsrv_session *session = NULL;
1503 NTSTATUS status;
1504
1505 errno = 0;
1506
1507 if (!xconn->smb1.negprot.done) {
1508 switch (type) {
1509 /*
1510 * Without a negprot the request must
1511 * either be a negprot, or one of the
1512 * evil old SMB mailslot messaging types.
1513 */
1514 case SMBnegprot:
1515 case SMBsendstrt:
1516 case SMBsendend:
1517 case SMBsendtxt:
1518 break;
1519 default:
1520 exit_server_cleanly("The first request "
1521 "should be a negprot");
1522 }
1523 }
1524
1525 if (smb_messages[type].fn == NULL) {
1526 DEBUG(0,("Unknown message type %d!\n",type));
1527 smb_dump("Unknown", 1, (const char *)req->inbuf);
1528 reply_unknown_new(req, type);
1529 return NULL;
1530 }
1531
1532 flags = smb_messages[type].flags;
1533
1534 /* In share mode security we must ignore the vuid. */
1535 session_tag = req->vuid;
1536 conn = req->conn;
1537
1538 DEBUG(3,("switch message %s (pid %d) conn 0x%lx\n", smb_fn_name(type),
1539 (int)getpid(), (unsigned long)conn));
1540
1541 smb_dump(smb_fn_name(type), 1, (const char *)req->inbuf);
1542
1543 /* Ensure this value is replaced in the incoming packet. */
1544 SSVAL(discard_const_p(uint8_t, req->inbuf),smb_uid,session_tag);
1545
1546 /*
1547 * Ensure the correct username is in current_user_info. This is a
1548 * really ugly bugfix for problems with multiple session_setup_and_X's
1549 * being done and allowing %U and %G substitutions to work correctly.
1550 * There is a reason this code is done here, don't move it unless you
1551 * know what you're doing... :-).
1552 * JRA.
1553 */
1554
1555 /*
1556 * lookup an existing session
1557 *
1558 * Note: for now we only check for NT_STATUS_NETWORK_SESSION_EXPIRED
1559 * here, the main check is still in change_to_user()
1560 */
1561 status = smb1srv_session_lookup(xconn,
1562 session_tag,
1563 now,
1564 &session);
1565 if (NT_STATUS_EQUAL(status, NT_STATUS_NETWORK_SESSION_EXPIRED)) {
1566 switch (type) {
1567 case SMBsesssetupX:
1568 status = NT_STATUS_OK;
1569 break;
1570 default:
1571 DEBUG(1,("Error: session %llu is expired, mid=%llu.\n",
1572 (unsigned long long)session_tag,
1573 (unsigned long long)req->mid));
1574 reply_nterror(req, NT_STATUS_NETWORK_SESSION_EXPIRED);
1575 return conn;
1576 }
1577 }
1578
1579 if (session_tag != xconn->client->last_session_id) {
1580 struct user_struct *vuser = NULL;
1581
1582 xconn->client->last_session_id = session_tag;
1583 if (session) {
1584 vuser = session->compat;
1585 }
1586 if (vuser) {
1587 set_current_user_info(
1588 vuser->session_info->unix_info->sanitized_username,
1589 vuser->session_info->unix_info->unix_name,
1590 vuser->session_info->info->domain_name);
1591 }
1592 }
1593
1594 /* Does this call need to be run as the connected user? */
1595 if (flags & AS_USER) {
1596
1597 /* Does this call need a valid tree connection? */
1598 if (!conn) {
1599 /*
1600 * Amazingly, the error code depends on the command
1601 * (from Samba4).
1602 */
1603 if (type == SMBntcreateX) {
1604 reply_nterror(req, NT_STATUS_INVALID_HANDLE);
1605 } else {
1606 reply_nterror(req, NT_STATUS_NETWORK_NAME_DELETED);
1607 }
1608 return NULL;
1609 }
1610
1611 if (!change_to_user(conn,session_tag)) {
1612 DEBUG(0, ("Error: Could not change to user. Removing "
1613 "deferred open, mid=%llu.\n",
1614 (unsigned long long)req->mid));
1615 reply_force_doserror(req, ERRSRV, ERRbaduid);
1616 return conn;
1617 }
1618
1619 /* All NEED_WRITE and CAN_IPC flags must also have AS_USER. */
1620
1621 /* Does it need write permission? */
1622 if ((flags & NEED_WRITE) && !CAN_WRITE(conn)) {
1623 reply_nterror(req, NT_STATUS_MEDIA_WRITE_PROTECTED);
1624 return conn;
1625 }
1626
1627 /* IPC services are limited */
1628 if (IS_IPC(conn) && !(flags & CAN_IPC)) {
1629 reply_nterror(req, NT_STATUS_ACCESS_DENIED);
1630 return conn;
1631 }
1632 } else {
1633 /* This call needs to be run as root */
1634 change_to_root_user();
1635 }
1636
1637 /* load service specific parameters */
1638 if (conn) {
1639 if (req->encrypted) {
1640 conn->encrypted_tid = true;
1641 /* encrypted required from now on. */
1642 conn->encrypt_level = SMB_SIGNING_REQUIRED;
1643 } else if (ENCRYPTION_REQUIRED(conn)) {
1644 if (req->cmd != SMBtrans2 && req->cmd != SMBtranss2) {
1645 DEBUG(1,("service[%s] requires encryption"
1646 "%s ACCESS_DENIED. mid=%llu\n",
1647 lp_servicename(talloc_tos(), SNUM(conn)),
1648 smb_fn_name(type),
1649 (unsigned long long)req->mid));
1650 reply_nterror(req, NT_STATUS_ACCESS_DENIED);
1651 return conn;
1652 }
1653 }
1654
1655 if (!set_current_service(conn,SVAL(req->inbuf,smb_flg),
1656 (flags & (AS_USER|DO_CHDIR)
1657 ?True:False))) {
1658 reply_nterror(req, NT_STATUS_ACCESS_DENIED);
1659 return conn;
1660 }
1661 conn->num_smb_operations++;
1662 }
1663
1664 /*
1665 * Does this protocol need to be run as guest? (Only archane
1666 * messenger service requests have this...)
1667 */
1668 if (flags & AS_GUEST) {
1669 char *raddr;
1670 bool ok;
1671
1672 if (!change_to_guest()) {
1673 reply_nterror(req, NT_STATUS_ACCESS_DENIED);
1674 return conn;
1675 }
1676
1677 raddr = tsocket_address_inet_addr_string(xconn->remote_address,
1678 talloc_tos());
1679 if (raddr == NULL) {
1680 reply_nterror(req, NT_STATUS_NO_MEMORY);
1681 return conn;
1682 }
1683
1684 /*
1685 * Haven't we checked this in smbd_process already???
1686 */
1687
1688 ok = allow_access(lp_hosts_deny(-1), lp_hosts_allow(-1),
1689 xconn->remote_hostname, raddr);
1690 TALLOC_FREE(raddr);
1691
1692 if (!ok) {
1693 reply_nterror(req, NT_STATUS_ACCESS_DENIED);
1694 return conn;
1695 }
1696 }
1697
1698 /*
1699 * Update encryption and signing state tracking flags that are
1700 * used by smbstatus to display signing and encryption status.
1701 */
1702 if (session != NULL) {
1703 bool update_session_global = false;
1704 bool update_tcon_global = false;
1705
1706 smb1srv_update_crypto_flags(session, req, type,
1707 &update_session_global,
1708 &update_tcon_global);
1709
1710 if (update_session_global) {
1711 status = smbXsrv_session_update(session);
1712 if (!NT_STATUS_IS_OK(status)) {
1713 reply_nterror(req, NT_STATUS_UNSUCCESSFUL);
1714 return conn;
1715 }
1716 }
1717
1718 if (update_tcon_global) {
1719 status = smbXsrv_tcon_update(req->conn->tcon);
1720 if (!NT_STATUS_IS_OK(status)) {
1721 reply_nterror(req, NT_STATUS_UNSUCCESSFUL);
1722 return conn;
1723 }
1724 }
1725 }
1726
1727 smb_messages[type].fn(req);
1728 return req->conn;
1729 }
1730
1731 /****************************************************************************
1732 Construct a reply to the incoming packet.
1733 ****************************************************************************/
1734
1735 static void construct_reply(struct smbXsrv_connection *xconn,
1736 char *inbuf, int size, size_t unread_bytes,
1737 uint32_t seqnum, bool encrypted,
1738 struct smb_perfcount_data *deferred_pcd)
1739 {
1740 struct smbd_server_connection *sconn = xconn->client->sconn;
1741 struct smb_request *req;
1742
1743 if (!(req = talloc(talloc_tos(), struct smb_request))) {
1744 smb_panic("could not allocate smb_request");
1745 }
1746
1747 if (!init_smb_request(req, sconn, xconn, (uint8_t *)inbuf, unread_bytes,
1748 encrypted, seqnum)) {
1749 exit_server_cleanly("Invalid SMB request");
1750 }
1751
1752 req->inbuf = (uint8_t *)talloc_move(req, &inbuf);
1753
1754 /* we popped this message off the queue - keep original perf data */
1755 if (deferred_pcd)
1756 req->pcd = *deferred_pcd;
1757 else {
1758 SMB_PERFCOUNT_START(&req->pcd);
1759 SMB_PERFCOUNT_SET_OP(&req->pcd, req->cmd);
1760 SMB_PERFCOUNT_SET_MSGLEN_IN(&req->pcd, size);
1761 }
1762
1763 req->conn = switch_message(req->cmd, req);
1764
1765 if (req->outbuf == NULL) {
1766 /*
1767 * Request has suspended itself, will come
1768 * back here.
1769 */
1770 return;
1771 }
1772 if (CVAL(req->outbuf,0) == 0) {
1773 show_msg((char *)req->outbuf);
1774 }
1775 smb_request_done(req);
1776 }
1777
1778 static void construct_reply_chain(struct smbXsrv_connection *xconn,
1779 char *inbuf, int size, uint32_t seqnum,
1780 bool encrypted,
1781 struct smb_perfcount_data *deferred_pcd)
1782 {
1783 struct smb_request **reqs = NULL;
1784 struct smb_request *req;
1785 unsigned num_reqs;
1786 bool ok;
1787
1788 ok = smb1_parse_chain(xconn, (uint8_t *)inbuf, xconn, encrypted,
1789 seqnum, &reqs, &num_reqs);
1790 if (!ok) {
1791 char errbuf[smb_size];
1792 error_packet(errbuf, 0, 0, NT_STATUS_INVALID_PARAMETER,
1793 __LINE__, __FILE__);
1794 if (!srv_send_smb(xconn, errbuf, true, seqnum, encrypted,
1795 NULL)) {
1796 exit_server_cleanly("construct_reply_chain: "
1797 "srv_send_smb failed.");
1798 }
1799 return;
1800 }
1801
1802 req = reqs[0];
1803 req->inbuf = (uint8_t *)talloc_move(reqs, &inbuf);
1804
1805 req->conn = switch_message(req->cmd, req);
1806
1807 if (req->outbuf == NULL) {
1808 /*
1809 * Request has suspended itself, will come
1810 * back here.
1811 */
1812 return;
1813 }
1814 smb_request_done(req);
1815 }
1816
1817 /*
1818 * To be called from an async SMB handler that is potentially chained
1819 * when it is finished for shipping.
1820 */
1821
1822 void smb_request_done(struct smb_request *req)
1823 {
1824 struct smb_request **reqs = NULL;
1825 struct smb_request *first_req;
1826 size_t i, num_reqs, next_index;
1827 NTSTATUS status;
1828
1829 if (req->chain == NULL) {
1830 first_req = req;
1831 goto shipit;
1832 }
1833
1834 reqs = req->chain;
1835 num_reqs = talloc_array_length(reqs);
1836
1837 for (i=0; i<num_reqs; i++) {
1838 if (reqs[i] == req) {
1839 break;
1840 }
1841 }
1842 if (i == num_reqs) {
1843 /*
1844 * Invalid chain, should not happen
1845 */
1846 status = NT_STATUS_INTERNAL_ERROR;
1847 goto error;
1848 }
1849 next_index = i+1;
1850
1851 while ((next_index < num_reqs) && (IVAL(req->outbuf, smb_rcls) == 0)) {
1852 struct smb_request *next = reqs[next_index];
1853 struct smbXsrv_tcon *tcon;
1854 NTTIME now = timeval_to_nttime(&req->request_time);
1855
1856 next->vuid = SVAL(req->outbuf, smb_uid);
1857 next->tid = SVAL(req->outbuf, smb_tid);
1858 status = smb1srv_tcon_lookup(req->xconn, req->tid,
1859 now, &tcon);
1860 if (NT_STATUS_IS_OK(status)) {
1861 req->conn = tcon->compat;
1862 } else {
1863 req->conn = NULL;
1864 }
1865 next->chain_fsp = req->chain_fsp;
1866 next->inbuf = req->inbuf;
1867
1868 req = next;
1869 req->conn = switch_message(req->cmd, req);
1870
1871 if (req->outbuf == NULL) {
1872 /*
1873 * Request has suspended itself, will come
1874 * back here.
1875 */
1876 return;
1877 }
1878 next_index += 1;
1879 }
1880
1881 first_req = reqs[0];
1882
1883 for (i=1; i<next_index; i++) {
1884 bool ok;
1885
1886 ok = smb_splice_chain(&first_req->outbuf, reqs[i]->outbuf);
1887 if (!ok) {
1888 status = NT_STATUS_INTERNAL_ERROR;
1889 goto error;
1890 }
1891 }
1892
1893 SSVAL(first_req->outbuf, smb_uid, SVAL(req->outbuf, smb_uid));
1894 SSVAL(first_req->outbuf, smb_tid, SVAL(req->outbuf, smb_tid));
1895
1896 /*
1897 * This scary statement intends to set the
1898 * FLAGS2_32_BIT_ERROR_CODES flg2 field in first_req->outbuf
1899 * to the value last_req->outbuf carries
1900 */
1901 SSVAL(first_req->outbuf, smb_flg2,
1902 (SVAL(first_req->outbuf, smb_flg2) & ~FLAGS2_32_BIT_ERROR_CODES)
1903 |(SVAL(req->outbuf, smb_flg2) & FLAGS2_32_BIT_ERROR_CODES));
1904
1905 /*
1906 * Transfer the error codes from the subrequest to the main one
1907 */
1908 SSVAL(first_req->outbuf, smb_rcls, SVAL(req->outbuf, smb_rcls));
1909 SSVAL(first_req->outbuf, smb_err, SVAL(req->outbuf, smb_err));
1910
1911 _smb_setlen_large(
1912 first_req->outbuf, talloc_get_size(first_req->outbuf) - 4);
1913
1914 shipit:
1915 if (!srv_send_smb(first_req->xconn,
1916 (char *)first_req->outbuf,
1917 true, first_req->seqnum+1,
1918 IS_CONN_ENCRYPTED(req->conn)||first_req->encrypted,
1919 &first_req->pcd)) {
1920 exit_server_cleanly("construct_reply_chain: srv_send_smb "
1921 "failed.");
1922 }
1923 TALLOC_FREE(req); /* non-chained case */
1924 TALLOC_FREE(reqs); /* chained case */
1925 return;
1926
1927 error:
1928 {
1929 char errbuf[smb_size];
1930 error_packet(errbuf, 0, 0, status, __LINE__, __FILE__);
1931 if (!srv_send_smb(req->xconn, errbuf, true,
1932 req->seqnum+1, req->encrypted,
1933 NULL)) {
1934 exit_server_cleanly("construct_reply_chain: "
1935 "srv_send_smb failed.");
1936 }
1937 }
1938 TALLOC_FREE(req); /* non-chained case */
1939 TALLOC_FREE(reqs); /* chained case */
1940 }
1941
1942 /****************************************************************************
1943 Process an smb from the client
1944 ****************************************************************************/
1945 static void process_smb(struct smbXsrv_connection *xconn,
1946 uint8_t *inbuf, size_t nread, size_t unread_bytes,
1947 uint32_t seqnum, bool encrypted,
1948 struct smb_perfcount_data *deferred_pcd)
1949 {
1950 struct smbd_server_connection *sconn = xconn->client->sconn;
1951 int msg_type = CVAL(inbuf,0);
1952
1953 DO_PROFILE_INC(request);
1954
1955 DEBUG( 6, ( "got message type 0x%x of len 0x%x\n", msg_type,
1956 smb_len(inbuf) ) );
1957 DEBUG(3, ("Transaction %d of length %d (%u toread)\n",
1958 sconn->trans_num, (int)nread, (unsigned int)unread_bytes));
1959
1960 if (msg_type != NBSSmessage) {
1961 /*
1962 * NetBIOS session request, keepalive, etc.
1963 */
1964 reply_special(xconn, (char *)inbuf, nread);
1965 goto done;
1966 }
1967
1968 if (sconn->using_smb2) {
1969 /* At this point we're not really using smb2,
1970 * we make the decision here.. */
1971 if (smbd_is_smb2_header(inbuf, nread)) {
1972 const uint8_t *inpdu = inbuf + NBT_HDR_SIZE;
1973 size_t pdulen = nread - NBT_HDR_SIZE;
1974 smbd_smb2_process_negprot(xconn, 0, inpdu, pdulen);
1975 return;
1976 } else if (nread >= smb_size && valid_smb_header(inbuf)
1977 && CVAL(inbuf, smb_com) != 0x72) {
1978 /* This is a non-negprot SMB1 packet.
1979 Disable SMB2 from now on. */
1980 sconn->using_smb2 = false;
1981 }
1982 }
1983
1984 /* Make sure this is an SMB packet. smb_size contains NetBIOS header
1985 * so subtract 4 from it. */
1986 if ((nread < (smb_size - 4)) || !valid_smb_header(inbuf)) {
1987 DEBUG(2,("Non-SMB packet of length %d. Terminating server\n",
1988 smb_len(inbuf)));
1989
1990 /* special magic for immediate exit */
1991 if ((nread == 9) &&
1992 (IVAL(inbuf, 4) == 0x74697865) &&
1993 lp_parm_bool(-1, "smbd", "suicide mode", false)) {
1994 uint8_t exitcode = CVAL(inbuf, 8);
1995 DEBUG(1, ("Exiting immediately with code %d\n",
1996 (int)exitcode));
1997 exit(exitcode);
1998 }
1999
2000 exit_server_cleanly("Non-SMB packet");
2001 }
2002
2003 show_msg((char *)inbuf);
2004
2005 if ((unread_bytes == 0) && smb1_is_chain(inbuf)) {
2006 construct_reply_chain(xconn, (char *)inbuf, nread,
2007 seqnum, encrypted, deferred_pcd);
2008 } else {
2009 construct_reply(xconn, (char *)inbuf, nread, unread_bytes,
2010 seqnum, encrypted, deferred_pcd);
2011 }
2012
2013 sconn->trans_num++;
2014
2015 done:
2016 sconn->num_requests++;
2017
2018 /* The timeout_processing function isn't run nearly
2019 often enough to implement 'max log size' without
2020 overrunning the size of the file by many megabytes.
2021 This is especially true if we are running at debug
2022 level 10. Checking every 50 SMBs is a nice
2023 tradeoff of performance vs log file size overrun. */
2024
2025 if ((sconn->num_requests % 50) == 0 &&
2026 need_to_check_log_size()) {
2027 change_to_root_user();
2028 check_log_size();
2029 }
2030 }
2031
2032 /****************************************************************************
2033 Return a string containing the function name of a SMB command.
2034 ****************************************************************************/
2035
2036 const char *smb_fn_name(int type)
2037 {
2038 const char *unknown_name = "SMBunknown";
2039
2040 if (smb_messages[type].name == NULL)
2041 return(unknown_name);
2042
2043 return(smb_messages[type].name);
2044 }
2045
2046 /****************************************************************************
2047 Helper functions for contruct_reply.
2048 ****************************************************************************/
2049
2050 void add_to_common_flags2(uint32_t v)
2051 {
2052 common_flags2 |= v;
2053 }
2054
2055 void remove_from_common_flags2(uint32_t v)
2056 {
2057 common_flags2 &= ~v;
2058 }
2059
2060 static void construct_reply_common(uint8_t cmd, const uint8_t *inbuf,
2061 char *outbuf)
2062 {
2063 uint16_t in_flags2 = SVAL(inbuf,smb_flg2);
2064 uint16_t out_flags2 = common_flags2;
2065
2066 out_flags2 |= in_flags2 & FLAGS2_UNICODE_STRINGS;
2067 out_flags2 |= in_flags2 & FLAGS2_SMB_SECURITY_SIGNATURES;
2068 out_flags2 |= in_flags2 & FLAGS2_SMB_SECURITY_SIGNATURES_REQUIRED;
2069
2070 srv_set_message(outbuf,0,0,false);
2071
2072 SCVAL(outbuf, smb_com, cmd);
2073 SIVAL(outbuf,smb_rcls,0);
2074 SCVAL(outbuf,smb_flg, FLAG_REPLY | (CVAL(inbuf,smb_flg) & FLAG_CASELESS_PATHNAMES));
2075 SSVAL(outbuf,smb_flg2, out_flags2);
2076 memset(outbuf+smb_pidhigh,'\0',(smb_tid-smb_pidhigh));
2077 memcpy(outbuf+smb_ss_field, inbuf+smb_ss_field, 8);
2078
2079 SSVAL(outbuf,smb_tid,SVAL(inbuf,smb_tid));
2080 SSVAL(outbuf,smb_pid,SVAL(inbuf,smb_pid));
2081 SSVAL(outbuf,smb_pidhigh,SVAL(inbuf,smb_pidhigh));
2082 SSVAL(outbuf,smb_uid,SVAL(inbuf,smb_uid));
2083 SSVAL(outbuf,smb_mid,SVAL(inbuf,smb_mid));
2084 }
2085
2086 void construct_reply_common_req(struct smb_request *req, char *outbuf)
2087 {
2088 construct_reply_common(req->cmd, req->inbuf, outbuf);
2089 }
2090
2091 /**
2092 * @brief Find the smb_cmd offset of the last command pushed
2093 * @param[in] buf The buffer we're building up
2094 * @retval Where can we put our next andx cmd?
2095 *
2096 * While chaining requests, the "next" request we're looking at needs to put
2097 * its SMB_Command before the data the previous request already built up added
2098 * to the chain. Find the offset to the place where we have to put our cmd.
2099 */
2100
2101 static bool find_andx_cmd_ofs(uint8_t *buf, size_t *pofs)
2102 {
2103 uint8_t cmd;
2104 size_t ofs;
2105
2106 cmd = CVAL(buf, smb_com);
2107
2108 if (!is_andx_req(cmd)) {
2109 return false;
2110 }
2111
2112 ofs = smb_vwv0;
2113
2114 while (CVAL(buf, ofs) != 0xff) {
2115
2116 if (!is_andx_req(CVAL(buf, ofs))) {
2117 return false;
2118 }
2119
2120 /*
2121 * ofs is from start of smb header, so add the 4 length
2122 * bytes. The next cmd is right after the wct field.
2123 */
2124 ofs = SVAL(buf, ofs+2) + 4 + 1;
2125
2126 if (ofs+4 >= talloc_get_size(buf)) {
2127 return false;
2128 }
2129 }
2130
2131 *pofs = ofs;
2132 return true;
2133 }
2134
2135 /**
2136 * @brief Do the smb chaining at a buffer level
2137 * @param[in] poutbuf Pointer to the talloc'ed buffer to be modified
2138 * @param[in] andx_buf Buffer to be appended
2139 */
2140
2141 static bool smb_splice_chain(uint8_t **poutbuf, const uint8_t *andx_buf)
2142 {
2143 uint8_t smb_command = CVAL(andx_buf, smb_com);
2144 uint8_t wct = CVAL(andx_buf, smb_wct);
2145 const uint16_t *vwv = (const uint16_t *)(andx_buf + smb_vwv);
2146 uint32_t num_bytes = smb_buflen(andx_buf);
2147 const uint8_t *bytes = (const uint8_t *)smb_buf_const(andx_buf);
2148
2149 uint8_t *outbuf;
2150 size_t old_size, new_size;
2151 size_t ofs;
2152 size_t chain_padding = 0;
2153 size_t andx_cmd_ofs;
2154
2155
2156 old_size = talloc_get_size(*poutbuf);
2157
2158 if ((old_size % 4) != 0) {
2159 /*
2160 * Align the wct field of subsequent requests to a 4-byte
2161 * boundary
2162 */
2163 chain_padding = 4 - (old_size % 4);
2164 }
2165
2166 /*
2167 * After the old request comes the new wct field (1 byte), the vwv's
2168 * and the num_bytes field.
2169 */
2170
2171 new_size = old_size + chain_padding + 1 + wct * sizeof(uint16_t) + 2;
2172 new_size += num_bytes;
2173
2174 if ((smb_command != SMBwriteX) && (new_size > 0xffff)) {
2175 DEBUG(1, ("smb_splice_chain: %u bytes won't fit\n",
2176 (unsigned)new_size));
2177 return false;
2178 }
2179
2180 outbuf = talloc_realloc(NULL, *poutbuf, uint8_t, new_size);
2181 if (outbuf == NULL) {
2182 DEBUG(0, ("talloc failed\n"));
2183 return false;
2184 }
2185 *poutbuf = outbuf;
2186
2187 if (!find_andx_cmd_ofs(outbuf, &andx_cmd_ofs)) {
2188 DEBUG(1, ("invalid command chain\n"));
2189 *poutbuf = talloc_realloc(NULL, *poutbuf, uint8_t, old_size);
2190 return false;
2191 }
2192
2193 if (chain_padding != 0) {
2194 memset(outbuf + old_size, 0, chain_padding);
2195 old_size += chain_padding;
2196 }
2197
2198 SCVAL(outbuf, andx_cmd_ofs, smb_command);
2199 SSVAL(outbuf, andx_cmd_ofs + 2, old_size - 4);
2200
2201 ofs = old_size;
2202
2203 /*
2204 * Push the chained request:
2205 *
2206 * wct field
2207 */
2208
2209 SCVAL(outbuf, ofs, wct);
2210 ofs += 1;
2211
2212 /*
2213 * vwv array
2214 */
2215
2216 memcpy(outbuf + ofs, vwv, sizeof(uint16_t) * wct);
2217
2218 /*
2219 * HACK ALERT
2220 *
2221 * Read&X has an offset into its data buffer at
2222 * vwv[6]. reply_read_andx has no idea anymore that it's
2223 * running from within a chain, so we have to fix up the
2224 * offset here.
2225 *
2226 * Although it looks disgusting at this place, I want to keep
2227 * it here. The alternative would be to push knowledge about
2228 * the andx chain down into read&x again.
2229 */
2230
2231 if (smb_command == SMBreadX) {
2232 uint8_t *bytes_addr;
2233
2234 if (wct < 7) {
2235 /*
2236 * Invalid read&x response
2237 */
2238 return false;
2239 }
2240
2241 bytes_addr = outbuf + ofs /* vwv start */
2242 + sizeof(uint16_t) * wct /* vwv array */
2243 + sizeof(uint16_t) /* bcc */
2244 + 1; /* padding byte */
2245
2246 SSVAL(outbuf + ofs, 6 * sizeof(uint16_t),
2247 bytes_addr - outbuf - 4);
2248 }
2249
2250 ofs += sizeof(uint16_t) * wct;
2251
2252 /*
2253 * bcc (byte count)
2254 */
2255
2256 SSVAL(outbuf, ofs, num_bytes);
2257 ofs += sizeof(uint16_t);
2258
2259 /*
2260 * The bytes field
2261 */
2262
2263 memcpy(outbuf + ofs, bytes, num_bytes);
2264
2265 return true;
2266 }
2267
2268 bool smb1_is_chain(const uint8_t *buf)
2269 {
2270 uint8_t cmd, wct, andx_cmd;
2271
2272 cmd = CVAL(buf, smb_com);
2273 if (!is_andx_req(cmd)) {
2274 return false;
2275 }
2276 wct = CVAL(buf, smb_wct);
2277 if (wct < 2) {
2278 return false;
2279 }
2280 andx_cmd = CVAL(buf, smb_vwv);
2281 return (andx_cmd != 0xFF);
2282 }
2283
2284 bool smb1_walk_chain(const uint8_t *buf,
2285 bool (*fn)(uint8_t cmd,
2286 uint8_t wct, const uint16_t *vwv,
2287 uint16_t num_bytes, const uint8_t *bytes,
2288 void *private_data),
2289 void *private_data)
2290 {
2291 size_t smblen = smb_len(buf);
2292 const char *smb_buf = smb_base(buf);
2293 uint8_t cmd, chain_cmd;
2294 uint8_t wct;
2295 const uint16_t *vwv;
2296 uint16_t num_bytes;
2297 const uint8_t *bytes;
2298
2299 cmd = CVAL(buf, smb_com);
2300 wct = CVAL(buf, smb_wct);
2301 vwv = (const uint16_t *)(buf + smb_vwv);
2302 num_bytes = smb_buflen(buf);
2303 bytes = (const uint8_t *)smb_buf_const(buf);
2304
2305 if (!fn(cmd, wct, vwv, num_bytes, bytes, private_data)) {
2306 return false;
2307 }
2308
2309 if (!is_andx_req(cmd)) {
2310 return true;
2311 }
2312 if (wct < 2) {
2313 return false;
2314 }
2315
2316 chain_cmd = CVAL(vwv, 0);
2317
2318 while (chain_cmd != 0xff) {
2319 uint32_t chain_offset; /* uint32_t to avoid overflow */
2320 size_t length_needed;
2321 ptrdiff_t vwv_offset;
2322
2323 chain_offset = SVAL(vwv+1, 0);
2324
2325 /*
2326 * Check if the client tries to fool us. The chain
2327 * offset needs to point beyond the current request in
2328 * the chain, it needs to strictly grow. Otherwise we
2329 * might be tricked into an endless loop always
2330 * processing the same request over and over again. We
2331 * used to assume that vwv and the byte buffer array
2332 * in a chain are always attached, but OS/2 the
2333 * Write&X/Read&X chain puts the Read&X vwv array
2334 * right behind the Write&X vwv chain. The Write&X bcc
2335 * array is put behind the Read&X vwv array. So now we
2336 * check whether the chain offset points strictly
2337 * behind the previous vwv array. req->buf points
2338 * right after the vwv array of the previous
2339 * request. See
2340 * https://bugzilla.samba.org/show_bug.cgi?id=8360 for
2341 * more information.
2342 */
2343
2344 vwv_offset = ((const char *)vwv - smb_buf);
2345 if (chain_offset <= vwv_offset) {
2346 return false;
2347 }
2348
2349 /*
2350 * Next check: Make sure the chain offset does not
2351 * point beyond the overall smb request length.
2352 */
2353
2354 length_needed = chain_offset+1; /* wct */
2355 if (length_needed > smblen) {
2356 return false;
2357 }
2358
2359 /*
2360 * Now comes the pointer magic. Goal here is to set up
2361 * vwv and buf correctly again. The chain offset (the
2362 * former vwv[1]) points at the new wct field.
2363 */
2364
2365 wct = CVAL(smb_buf, chain_offset);
2366
2367 if (is_andx_req(chain_cmd) && (wct < 2)) {
2368 return false;
2369 }
2370
2371 /*
2372 * Next consistency check: Make the new vwv array fits
2373 * in the overall smb request.
2374 */
2375
2376 length_needed += (wct+1)*sizeof(uint16_t); /* vwv+buflen */
2377 if (length_needed > smblen) {
2378 return false;
2379 }
2380 vwv = (const uint16_t *)(smb_buf + chain_offset + 1);
2381
2382 /*
2383 * Now grab the new byte buffer....
2384 */
2385
2386 num_bytes = SVAL(vwv+wct, 0);
2387
2388 /*
2389 * .. and check that it fits.
2390 */
2391
2392 length_needed += num_bytes;
2393 if (length_needed > smblen) {
2394 return false;
2395 }
2396 bytes = (const uint8_t *)(vwv+wct+1);
2397
2398 if (!fn(chain_cmd, wct, vwv, num_bytes, bytes, private_data)) {
2399 return false;
2400 }
2401
2402 if (!is_andx_req(chain_cmd)) {
2403 return true;
2404 }
2405 chain_cmd = CVAL(vwv, 0);
2406 }
2407 return true;
2408 }
2409
2410 static bool smb1_chain_length_cb(uint8_t cmd,
2411 uint8_t wct, const uint16_t *vwv,
2412 uint16_t num_bytes, const uint8_t *bytes,
2413 void *private_data)
2414 {
2415 unsigned *count = (unsigned *)private_data;
2416 *count += 1;
2417 return true;
2418 }
2419
2420 unsigned smb1_chain_length(const uint8_t *buf)
2421 {
2422 unsigned count = 0;
2423
2424 if (!smb1_walk_chain(buf, smb1_chain_length_cb, &count)) {
2425 return 0;
2426 }
2427 return count;
2428 }
2429
2430 struct smb1_parse_chain_state {
2431 TALLOC_CTX *mem_ctx;
2432 const uint8_t *buf;
2433 struct smbd_server_connection *sconn;
2434 struct smbXsrv_connection *xconn;
2435 bool encrypted;
2436 uint32_t seqnum;
2437
2438 struct smb_request **reqs;
2439 unsigned num_reqs;
2440 };
2441
2442 static bool smb1_parse_chain_cb(uint8_t cmd,
2443 uint8_t wct, const uint16_t *vwv,
2444 uint16_t num_bytes, const uint8_t *bytes,
2445 void *private_data)
2446 {
2447 struct smb1_parse_chain_state *state =
2448 (struct smb1_parse_chain_state *)private_data;
2449 struct smb_request **reqs;
2450 struct smb_request *req;
2451 bool ok;
2452
2453 reqs = talloc_realloc(state->mem_ctx, state->reqs,
2454 struct smb_request *, state->num_reqs+1);
2455 if (reqs == NULL) {
2456 return false;
2457 }
2458 state->reqs = reqs;
2459
2460 req = talloc(reqs, struct smb_request);
2461 if (req == NULL) {
2462 return false;
2463 }
2464
2465 ok = init_smb_request(req, state->sconn, state->xconn, state->buf, 0,
2466 state->encrypted, state->seqnum);
2467 if (!ok) {
2468 return false;
2469 }
2470 req->cmd = cmd;
2471 req->wct = wct;
2472 req->vwv = vwv;
2473 req->buflen = num_bytes;
2474 req->buf = bytes;
2475
2476 reqs[state->num_reqs] = req;
2477 state->num_reqs += 1;
2478 return true;
2479 }
2480
2481 bool smb1_parse_chain(TALLOC_CTX *mem_ctx, const uint8_t *buf,
2482 struct smbXsrv_connection *xconn,
2483 bool encrypted, uint32_t seqnum,
2484 struct smb_request ***reqs, unsigned *num_reqs)
2485 {
2486 struct smbd_server_connection *sconn = NULL;
2487 struct smb1_parse_chain_state state;
2488 unsigned i;
2489
2490 if (xconn != NULL) {
2491 sconn = xconn->client->sconn;
2492 }
2493
2494 state.mem_ctx = mem_ctx;
2495 state.buf = buf;
2496 state.sconn = sconn;
2497 state.xconn = xconn;
2498 state.encrypted = encrypted;
2499 state.seqnum = seqnum;
2500 state.reqs = NULL;
2501 state.num_reqs = 0;
2502
2503 if (!smb1_walk_chain(buf, smb1_parse_chain_cb, &state)) {
2504 TALLOC_FREE(state.reqs);
2505 return false;
2506 }
2507 for (i=0; i<state.num_reqs; i++) {
2508 state.reqs[i]->chain = state.reqs;
2509 }
2510 *reqs = state.reqs;
2511 *num_reqs = state.num_reqs;
2512 return true;
2513 }
2514
2515 /****************************************************************************
2516 Check if services need reloading.
2517 ****************************************************************************/
2518
2519 static void check_reload(struct smbd_server_connection *sconn, time_t t)
2520 {
2521
2522 if (last_smb_conf_reload_time == 0) {
2523 last_smb_conf_reload_time = t;
2524 }
2525
2526 if (t >= last_smb_conf_reload_time+SMBD_RELOAD_CHECK) {
2527 reload_services(sconn, conn_snum_used, true);
2528 last_smb_conf_reload_time = t;
2529 }
2530 }
2531
2532 static bool fd_is_readable(int fd)
2533 {
2534 int ret, revents;
2535
2536 ret = poll_one_fd(fd, POLLIN|POLLHUP, 0, &revents);
2537
2538 return ((ret > 0) && ((revents & (POLLIN|POLLHUP|POLLERR)) != 0));
2539
2540 }
2541
2542 static void smbd_server_connection_write_handler(
2543 struct smbXsrv_connection *xconn)
2544 {
2545 /* TODO: make write nonblocking */
2546 }
2547
2548 static void smbd_server_connection_read_handler(
2549 struct smbXsrv_connection *xconn, int fd)
2550 {
2551 uint8_t *inbuf = NULL;
2552 size_t inbuf_len = 0;
2553 size_t unread_bytes = 0;
2554 bool encrypted = false;
2555 TALLOC_CTX *mem_ctx = talloc_tos();
2556 NTSTATUS status;
2557 uint32_t seqnum;
2558
2559 bool async_echo = lp_async_smb_echo_handler();
2560 bool from_client = false;
2561
2562 if (async_echo) {
2563 if (fd_is_readable(xconn->smb1.echo_handler.trusted_fd)) {
2564 /*
2565 * This is the super-ugly hack to prefer the packets
2566 * forwarded by the echo handler over the ones by the
2567 * client directly
2568 */
2569 fd = xconn->smb1.echo_handler.trusted_fd;
2570 }
2571 }
2572
2573 from_client = (xconn->transport.sock == fd);
2574
2575 if (async_echo && from_client) {
2576 smbd_lock_socket(xconn);
2577
2578 if (!fd_is_readable(fd)) {
2579 DEBUG(10,("the echo listener was faster\n"));
2580 smbd_unlock_socket(xconn);
2581 return;
2582 }
2583 }
2584
2585 /* TODO: make this completely nonblocking */
2586 status = receive_smb_talloc(mem_ctx, xconn, fd,
2587 (char **)(void *)&inbuf,
2588 0, /* timeout */
2589 &unread_bytes,
2590 &encrypted,
2591 &inbuf_len, &seqnum,
2592 !from_client /* trusted channel */);
2593
2594 if (async_echo && from_client) {
2595 smbd_unlock_socket(xconn);
2596 }
2597
2598 if (NT_STATUS_EQUAL(status, NT_STATUS_RETRY)) {
2599 goto process;
2600 }
2601 if (NT_STATUS_IS_ERR(status)) {
2602 exit_server_cleanly("failed to receive smb request");
2603 }
2604 if (!NT_STATUS_IS_OK(status)) {
2605 return;
2606 }
2607
2608 process:
2609 process_smb(xconn, inbuf, inbuf_len, unread_bytes,
2610 seqnum, encrypted, NULL);
2611 }
2612
2613 static void smbd_server_connection_handler(struct tevent_context *ev,
2614 struct tevent_fd *fde,
2615 uint16_t flags,
2616 void *private_data)
2617 {
2618 struct smbXsrv_connection *xconn =
2619 talloc_get_type_abort(private_data,
2620 struct smbXsrv_connection);
2621
2622 if (!NT_STATUS_IS_OK(xconn->transport.status)) {
2623 /*
2624 * we're not supposed to do any io
2625 */
2626 TEVENT_FD_NOT_READABLE(xconn->transport.fde);
2627 TEVENT_FD_NOT_WRITEABLE(xconn->transport.fde);
2628 return;
2629 }
2630
2631 if (flags & TEVENT_FD_WRITE) {
2632 smbd_server_connection_write_handler(xconn);
2633 return;
2634 }
2635 if (flags & TEVENT_FD_READ) {
2636 smbd_server_connection_read_handler(xconn, xconn->transport.sock);
2637 return;
2638 }
2639 }
2640
2641 static void smbd_server_echo_handler(struct tevent_context *ev,
2642 struct tevent_fd *fde,
2643 uint16_t flags,
2644 void *private_data)
2645 {
2646 struct smbXsrv_connection *xconn =
2647 talloc_get_type_abort(private_data,
2648 struct smbXsrv_connection);
2649
2650 if (!NT_STATUS_IS_OK(xconn->transport.status)) {
2651 /*
2652 * we're not supposed to do any io
2653 */
2654 TEVENT_FD_NOT_READABLE(xconn->smb1.echo_handler.trusted_fde);
2655 TEVENT_FD_NOT_WRITEABLE(xconn->smb1.echo_handler.trusted_fde);
2656 return;
2657 }
2658
2659 if (flags & TEVENT_FD_WRITE) {
2660 smbd_server_connection_write_handler(xconn);
2661 return;
2662 }
2663 if (flags & TEVENT_FD_READ) {
2664 smbd_server_connection_read_handler(
2665 xconn, xconn->smb1.echo_handler.trusted_fd);
2666 return;
2667 }
2668 }
2669
2670 struct smbd_release_ip_state {
2671 struct smbXsrv_connection *xconn;
2672 struct tevent_immediate *im;
2673 char addr[INET6_ADDRSTRLEN];
2674 };
2675
2676 static void smbd_release_ip_immediate(struct tevent_context *ctx,
2677 struct tevent_immediate *im,
2678 void *private_data)
2679 {
2680 struct smbd_release_ip_state *state =
2681 talloc_get_type_abort(private_data,
2682 struct smbd_release_ip_state);
2683 struct smbXsrv_connection *xconn = state->xconn;
2684
2685 if (!NT_STATUS_EQUAL(xconn->transport.status, NT_STATUS_ADDRESS_CLOSED)) {
2686 /*
2687 * smbd_server_connection_terminate() already triggered ?
2688 */
2689 return;
2690 }
2691
2692 smbd_server_connection_terminate(xconn, "CTDB_SRVID_RELEASE_IP");
2693 }
2694
2695 /****************************************************************************
2696 received when we should release a specific IP
2697 ****************************************************************************/
2698 static int release_ip(uint32_t src_vnn, uint32_t dst_vnn,
2699 uint64_t dst_srvid,
2700 const uint8_t *msg, size_t msglen,
2701 void *private_data)
2702 {
2703 struct smbd_release_ip_state *state =
2704 talloc_get_type_abort(private_data,
2705 struct smbd_release_ip_state);
2706 struct smbXsrv_connection *xconn = state->xconn;
2707 const char *ip;
2708 const char *addr = state->addr;
2709 const char *p = addr;
2710
2711 if (msglen == 0) {
2712 return 0;
2713 }
2714 if (msg[msglen-1] != '\0') {
2715 return 0;
2716 }
2717
2718 ip = (const char *)msg;
2719
2720 if (!NT_STATUS_IS_OK(xconn->transport.status)) {
2721 /* avoid recursion */
2722 return 0;
2723 }
2724
2725 if (strncmp("::ffff:", addr, 7) == 0) {
2726 p = addr + 7;
2727 }
2728
2729 DEBUG(10, ("Got release IP message for %s, "
2730 "our address is %s\n", ip, p));
2731
2732 if ((strcmp(p, ip) == 0) || ((p != addr) && strcmp(addr, ip) == 0)) {
2733 DEBUG(0,("Got release IP message for our IP %s - exiting immediately\n",
2734 ip));
2735 /*
2736 * With SMB2 we should do a clean disconnect,
2737 * the previous_session_id in the session setup
2738 * will cleanup the old session, tcons and opens.
2739 *
2740 * A clean disconnect is needed in order to support
2741 * durable handles.
2742 *
2743 * Note: typically this is never triggered
2744 * as we got a TCP RST (triggered by ctdb event scripts)
2745 * before we get CTDB_SRVID_RELEASE_IP.
2746 *
2747 * We used to call _exit(1) here, but as this was mostly never
2748 * triggered and has implication on our process model,
2749 * we can just use smbd_server_connection_terminate()
2750 * (also for SMB1).
2751 *
2752 * We don't call smbd_server_connection_terminate() directly
2753 * as we might be called from within ctdbd_migrate(),
2754 * we need to defer our action to the next event loop
2755 */
2756 tevent_schedule_immediate(state->im, xconn->ev_ctx,
2757 smbd_release_ip_immediate, state);
2758
2759 /*
2760 * Make sure we don't get any io on the connection.
2761 */
2762 xconn->transport.status = NT_STATUS_ADDRESS_CLOSED;
2763 return EADDRNOTAVAIL;
2764 }
2765
2766 return 0;
2767 }
2768
2769 static NTSTATUS smbd_register_ips(struct smbXsrv_connection *xconn,
2770 struct sockaddr_storage *srv,
2771 struct sockaddr_storage *clnt)
2772 {
2773 struct smbd_release_ip_state *state;
2774 struct ctdbd_connection *cconn;
2775 int ret;
2776
2777 cconn = messaging_ctdbd_connection();
2778 if (cconn == NULL) {
2779 return NT_STATUS_NO_MEMORY;
2780 }
2781
2782 state = talloc_zero(xconn, struct smbd_release_ip_state);
2783 if (state == NULL) {
2784 return NT_STATUS_NO_MEMORY;
2785 }
2786 state->xconn = xconn;
2787 state->im = tevent_create_immediate(state);
2788 if (state->im == NULL) {
2789 return NT_STATUS_NO_MEMORY;
2790 }
2791 if (print_sockaddr(state->addr, sizeof(state->addr), srv) == NULL) {
2792 return NT_STATUS_NO_MEMORY;
2793 }
2794
2795 ret = ctdbd_register_ips(cconn, srv, clnt, release_ip, state);
2796 if (ret != 0) {
2797 return map_nt_error_from_unix(ret);
2798 }
2799 return NT_STATUS_OK;
2800 }
2801
2802 static void msg_kill_client_ip(struct messaging_context *msg_ctx,
2803 void *private_data, uint32_t msg_type,
2804 struct server_id server_id, DATA_BLOB *data)
2805 {
2806 struct smbd_server_connection *sconn = talloc_get_type_abort(
2807 private_data, struct smbd_server_connection);
2808 const char *ip = (char *) data->data;
2809 char *client_ip;
2810
2811 DBG_DEBUG("Got kill request for client IP %s\n", ip);
2812
2813 client_ip = tsocket_address_inet_addr_string(sconn->remote_address,
2814 talloc_tos());
2815 if (client_ip == NULL) {
2816 return;
2817 }
2818
2819 if (strequal(ip, client_ip)) {
2820 DBG_WARNING("Got kill client message for %s - "
2821 "exiting immediately\n", ip);
2822 exit_server_cleanly("Forced disconnect for client");
2823 }
2824
2825 TALLOC_FREE(client_ip);
2826 }
2827
2828 /*
2829 * Send keepalive packets to our client
2830 */
2831 static bool keepalive_fn(const struct timeval *now, void *private_data)
2832 {
2833 struct smbd_server_connection *sconn = talloc_get_type_abort(
2834 private_data, struct smbd_server_connection);
2835 struct smbXsrv_connection *xconn = NULL;
2836 bool ret;
2837
2838 if (sconn->using_smb2) {
2839 /* Don't do keepalives on an SMB2 connection. */
2840 return false;
2841 }
2842
2843 /*
2844 * With SMB1 we only have 1 connection
2845 */
2846 xconn = sconn->client->connections;
2847 smbd_lock_socket(xconn);
2848 ret = send_keepalive(xconn->transport.sock);
2849 smbd_unlock_socket(xconn);
2850
2851 if (!ret) {
2852 int saved_errno = errno;
2853 /*
2854 * Try and give an error message saying what
2855 * client failed.
2856 */
2857 DEBUG(0, ("send_keepalive failed for client %s. "
2858 "Error %s - exiting\n",
2859 smbXsrv_connection_dbg(xconn),
2860 strerror(saved_errno)));
2861 errno = saved_errno;
2862 return False;
2863 }
2864 return True;
2865 }
2866
2867 /*
2868 * Do the recurring check if we're idle
2869 */
2870 static bool deadtime_fn(const struct timeval *now, void *private_data)
2871 {
2872 struct smbd_server_connection *sconn =
2873 (struct smbd_server_connection *)private_data;
2874
2875 if ((conn_num_open(sconn) == 0)
2876 || (conn_idle_all(sconn, now->tv_sec))) {
2877 DEBUG( 2, ( "Closing idle connection\n" ) );
2878 messaging_send(sconn->msg_ctx,
2879 messaging_server_id(sconn->msg_ctx),
2880 MSG_SHUTDOWN, &data_blob_null);
2881 return False;
2882 }
2883
2884 return True;
2885 }
2886
2887 /*
2888 * Do the recurring log file and smb.conf reload checks.
2889 */
2890
2891 static bool housekeeping_fn(const struct timeval *now, void *private_data)
2892 {
2893 struct smbd_server_connection *sconn = talloc_get_type_abort(
2894 private_data, struct smbd_server_connection);
2895
2896 DEBUG(5, ("housekeeping\n"));
2897
2898 change_to_root_user();
2899
2900 /* update printer queue caches if necessary */
2901 update_monitored_printq_cache(sconn->msg_ctx);
2902
2903 /* check if we need to reload services */
2904 check_reload(sconn, time_mono(NULL));
2905
2906 /*
2907 * Force a log file check.
2908 */
2909 force_check_log_size();
2910 check_log_size();
2911 return true;
2912 }
2913
2914 /*
2915 * Read an smb packet in the echo handler child, giving the parent
2916 * smbd one second to react once the socket becomes readable.
2917 */
2918
2919 struct smbd_echo_read_state {
2920 struct tevent_context *ev;
2921 struct smbXsrv_connection *xconn;
2922
2923 char *buf;
2924 size_t buflen;
2925 uint32_t seqnum;
2926 };
2927
2928 static void smbd_echo_read_readable(struct tevent_req *subreq);
2929 static void smbd_echo_read_waited(struct tevent_req *subreq);
2930
2931 static struct tevent_req *smbd_echo_read_send(
2932 TALLOC_CTX *mem_ctx, struct tevent_context *ev,
2933 struct smbXsrv_connection *xconn)
2934 {
2935 struct tevent_req *req, *subreq;
2936 struct smbd_echo_read_state *state;
2937
2938 req = tevent_req_create(mem_ctx, &state,
2939 struct smbd_echo_read_state);
2940 if (req == NULL) {
2941 return NULL;
2942 }
2943 state->ev = ev;
2944 state->xconn = xconn;
2945
2946 subreq = wait_for_read_send(state, ev, xconn->transport.sock, false);
2947 if (tevent_req_nomem(subreq, req)) {
2948 return tevent_req_post(req, ev);
2949 }
2950 tevent_req_set_callback(subreq, smbd_echo_read_readable, req);
2951 return req;
2952 }
2953
2954 static void smbd_echo_read_readable(struct tevent_req *subreq)
2955 {
2956 struct tevent_req *req = tevent_req_callback_data(
2957 subreq, struct tevent_req);
2958 struct smbd_echo_read_state *state = tevent_req_data(
2959 req, struct smbd_echo_read_state);
2960 bool ok;
2961 int err;
2962
2963 ok = wait_for_read_recv(subreq, &err);
2964 TALLOC_FREE(subreq);
2965 if (!ok) {
2966 tevent_req_nterror(req, map_nt_error_from_unix(err));
2967 return;
2968 }
2969
2970 /*
2971 * Give the parent smbd one second to step in
2972 */
2973
2974 subreq = tevent_wakeup_send(
2975 state, state->ev, timeval_current_ofs(1, 0));
2976 if (tevent_req_nomem(subreq, req)) {
2977 return;
2978 }
2979 tevent_req_set_callback(subreq, smbd_echo_read_waited, req);
2980 }
2981
2982 static void smbd_echo_read_waited(struct tevent_req *subreq)
2983 {
2984 struct tevent_req *req = tevent_req_callback_data(
2985 subreq, struct tevent_req);
2986 struct smbd_echo_read_state *state = tevent_req_data(
2987 req, struct smbd_echo_read_state);
2988 struct smbXsrv_connection *xconn = state->xconn;
2989 bool ok;
2990 NTSTATUS status;
2991 size_t unread = 0;
2992 bool encrypted;
2993
2994 ok = tevent_wakeup_recv(subreq);
2995 TALLOC_FREE(subreq);
2996 if (!ok) {
2997 tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
2998 return;
2999 }
3000
3001 ok = smbd_lock_socket_internal(xconn);
3002 if (!ok) {
3003 tevent_req_nterror(req, map_nt_error_from_unix(errno));
3004 DEBUG(0, ("%s: failed to lock socket\n", __location__));
3005 return;
3006 }
3007
3008 if (!fd_is_readable(xconn->transport.sock)) {
3009 DEBUG(10,("echo_handler[%d] the parent smbd was faster\n",
3010 (int)getpid()));
3011
3012 ok = smbd_unlock_socket_internal(xconn);
3013 if (!ok) {
3014 tevent_req_nterror(req, map_nt_error_from_unix(errno));
3015 DEBUG(1, ("%s: failed to unlock socket\n",
3016 __location__));
3017 return;
3018 }
3019
3020 subreq = wait_for_read_send(state, state->ev,
3021 xconn->transport.sock, false);
3022 if (tevent_req_nomem(subreq, req)) {
3023 return;
3024 }
3025 tevent_req_set_callback(subreq, smbd_echo_read_readable, req);
3026 return;
3027 }
3028
3029 status = receive_smb_talloc(state, xconn,
3030 xconn->transport.sock,
3031 &state->buf,
3032 0 /* timeout */,
3033 &unread,
3034 &encrypted,
3035 &state->buflen,
3036 &state->seqnum,
3037 false /* trusted_channel*/);
3038
3039 if (tevent_req_nterror(req, status)) {
3040 tevent_req_nterror(req, status);
3041 DEBUG(1, ("echo_handler[%d]: receive_smb_raw_talloc failed: %s\n",
3042 (int)getpid(), nt_errstr(status)));
3043 return;
3044 }
3045
3046 ok = smbd_unlock_socket_internal(xconn);
3047 if (!ok) {
3048 tevent_req_nterror(req, map_nt_error_from_unix(errno));
3049 DEBUG(1, ("%s: failed to unlock socket\n", __location__));
3050 return;
3051 }
3052 tevent_req_done(req);
3053 }
3054
3055 static NTSTATUS smbd_echo_read_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
3056 char **pbuf, size_t *pbuflen, uint32_t *pseqnum)
3057 {
3058 struct smbd_echo_read_state *state = tevent_req_data(
3059 req, struct smbd_echo_read_state);
3060 NTSTATUS status;
3061
3062 if (tevent_req_is_nterror(req, &status)) {
3063 return status;
3064 }
3065 *pbuf = talloc_move(mem_ctx, &state->buf);
3066 *pbuflen = state->buflen;
3067 *pseqnum = state->seqnum;
3068 return NT_STATUS_OK;
3069 }
3070
3071 struct smbd_echo_state {
3072 struct tevent_context *ev;
3073 struct iovec *pending;
3074 struct smbd_server_connection *sconn;
3075 struct smbXsrv_connection *xconn;
3076 int parent_pipe;
3077
3078 struct tevent_fd *parent_fde;
3079
3080 struct tevent_req *write_req;
3081 };
3082
3083 static void smbd_echo_writer_done(struct tevent_req *req);
3084
3085 static void smbd_echo_activate_writer(struct smbd_echo_state *state)
3086 {
3087 int num_pending;
3088
3089 if (state->write_req != NULL) {
3090 return;
3091 }
3092
3093 num_pending = talloc_array_length(state->pending);
3094 if (num_pending == 0) {
3095 return;
3096 }
3097
3098 state->write_req = writev_send(state, state->ev, NULL,
3099 state->parent_pipe, false,
3100 state->pending, num_pending);
3101 if (state->write_req == NULL) {
3102 DEBUG(1, ("writev_send failed\n"));
3103 exit(1);
3104 }
3105
3106 talloc_steal(state->write_req, state->pending);
3107 state->pending = NULL;
3108
3109 tevent_req_set_callback(state->write_req, smbd_echo_writer_done,
3110 state);
3111 }
3112
3113 static void smbd_echo_writer_done(struct tevent_req *req)
3114 {
3115 struct smbd_echo_state *state = tevent_req_callback_data(
3116 req, struct smbd_echo_state);
3117 ssize_t written;
3118 int err;
3119
3120 written = writev_recv(req, &err);
3121 TALLOC_FREE(req);
3122 state->write_req = NULL;
3123 if (written == -1) {
3124 DEBUG(1, ("writev to parent failed: %s\n", strerror(err)));
3125 exit(1);
3126 }
3127 DEBUG(10,("echo_handler[%d]: forwarded pdu to main\n", (int)getpid()));
3128 smbd_echo_activate_writer(state);
3129 }
3130
3131 static bool smbd_echo_reply(struct smbd_echo_state *state,
3132 uint8_t *inbuf, size_t inbuf_len,
3133 uint32_t seqnum)
3134 {
3135 struct smb_request req;
3136 uint16_t num_replies;
3137 char *outbuf;
3138 bool ok;
3139
3140 if ((inbuf_len == 4) && (CVAL(inbuf, 0) == NBSSkeepalive)) {
3141 DEBUG(10, ("Got netbios keepalive\n"));
3142 /*
3143 * Just swallow it
3144 */
3145 return true;
3146 }
3147
3148 if (inbuf_len < smb_size) {
3149 DEBUG(10, ("Got short packet: %d bytes\n", (int)inbuf_len));
3150 return false;
3151 }
3152 if (!valid_smb_header(inbuf)) {
3153 DEBUG(10, ("Got invalid SMB header\n"));
3154 return false;
3155 }
3156
3157 if (!init_smb_request(&req, state->sconn, state->xconn, inbuf, 0, false,
3158 seqnum)) {
3159 return false;
3160 }
3161 req.inbuf = inbuf;
3162
3163 DEBUG(10, ("smbecho handler got cmd %d (%s)\n", (int)req.cmd,
3164 smb_messages[req.cmd].name
3165 ? smb_messages[req.cmd].name : "unknown"));
3166
3167 if (req.cmd != SMBecho) {
3168 return false;
3169 }
3170 if (req.wct < 1) {
3171 return false;
3172 }
3173
3174 num_replies = SVAL(req.vwv+0, 0);
3175 if (num_replies != 1) {
3176 /* Not a Windows "Hey, you're still there?" request */
3177 return false;
3178 }
3179
3180 if (!create_outbuf(talloc_tos(), &req, req.inbuf, &outbuf,
3181 1, req.buflen)) {
3182 DEBUG(10, ("create_outbuf failed\n"));
3183 return false;
3184 }
3185 req.outbuf = (uint8_t *)outbuf;
3186
3187 SSVAL(req.outbuf, smb_vwv0, num_replies);
3188
3189 if (req.buflen > 0) {
3190 memcpy(smb_buf(req.outbuf), req.buf, req.buflen);
3191 }
3192
3193 ok = srv_send_smb(req.xconn,
3194 (char *)outbuf,
3195 true, seqnum+1,
3196 false, &req.pcd);
3197 TALLOC_FREE(outbuf);
3198 if (!ok) {
3199 exit(1);
3200 }
3201
3202 return true;
3203 }
3204
3205 static void smbd_echo_exit(struct tevent_context *ev,
3206 struct tevent_fd *fde, uint16_t flags,
3207 void *private_data)
3208 {
3209 DEBUG(2, ("smbd_echo_exit: lost connection to parent\n"));
3210 exit(0);
3211 }
3212
3213 static void smbd_echo_got_packet(struct tevent_req *req);
3214
3215 static void smbd_echo_loop(struct smbXsrv_connection *xconn,
3216 int parent_pipe)
3217 {
3218 struct smbd_echo_state *state;
3219 struct tevent_req *read_req;
3220
3221 state = talloc_zero(xconn, struct smbd_echo_state);
3222 if (state == NULL) {
3223 DEBUG(1, ("talloc failed\n"));
3224 return;
3225 }
3226 state->xconn = xconn;
3227 state->parent_pipe = parent_pipe;
3228 state->ev = samba_tevent_context_init(state);
3229 if (state->ev == NULL) {
3230 DEBUG(1, ("samba_tevent_context_init failed\n"));
3231 TALLOC_FREE(state);
3232 return;
3233 }
3234 state->parent_fde = tevent_add_fd(state->ev, state, parent_pipe,
3235 TEVENT_FD_READ, smbd_echo_exit,
3236 state);
3237 if (state->parent_fde == NULL) {
3238 DEBUG(1, ("tevent_add_fd failed\n"));
3239 TALLOC_FREE(state);
3240 return;
3241 }
3242
3243 read_req = smbd_echo_read_send(state, state->ev, xconn);
3244 if (read_req == NULL) {
3245 DEBUG(1, ("smbd_echo_read_send failed\n"));
3246 TALLOC_FREE(state);
3247 return;
3248 }
3249 tevent_req_set_callback(read_req, smbd_echo_got_packet, state);
3250
3251 while (true) {
3252 if (tevent_loop_once(state->ev) == -1) {
3253 DEBUG(1, ("tevent_loop_once failed: %s\n",
3254 strerror(errno)));
3255 break;
3256 }
3257 }
3258 TALLOC_FREE(state);
3259 }
3260
3261 static void smbd_echo_got_packet(struct tevent_req *req)
3262 {
3263 struct smbd_echo_state *state = tevent_req_callback_data(
3264 req, struct smbd_echo_state);
3265 NTSTATUS status;
3266 char *buf = NULL;
3267 size_t buflen = 0;
3268 uint32_t seqnum = 0;
3269 bool reply;
3270
3271 status = smbd_echo_read_recv(req, state, &buf, &buflen, &seqnum);
3272 TALLOC_FREE(req);
3273 if (!NT_STATUS_IS_OK(status)) {
3274 DEBUG(1, ("smbd_echo_read_recv returned %s\n",
3275 nt_errstr(status)));
3276 exit(1);
3277 }
3278
3279 reply = smbd_echo_reply(state, (uint8_t *)buf, buflen, seqnum);
3280 if (!reply) {
3281 size_t num_pending;
3282 struct iovec *tmp;
3283 struct iovec *iov;
3284
3285 num_pending = talloc_array_length(state->pending);
3286 tmp = talloc_realloc(state, state->pending, struct iovec,
3287 num_pending+1);
3288 if (tmp == NULL) {
3289 DEBUG(1, ("talloc_realloc failed\n"));
3290 exit(1);
3291 }
3292 state->pending = tmp;
3293
3294 if (buflen >= smb_size) {
3295 /*
3296 * place the seqnum in the packet so that the main process
3297 * can reply with signing
3298 */
3299 SIVAL(buf, smb_ss_field, seqnum);
3300 SIVAL(buf, smb_ss_field+4, NT_STATUS_V(NT_STATUS_OK));
3301 }
3302
3303 iov = &state->pending[num_pending];
3304 iov->iov_base = talloc_move(state->pending, &buf);
3305 iov->iov_len = buflen;
3306
3307 DEBUG(10,("echo_handler[%d]: forward to main\n",
3308 (int)getpid()));
3309 smbd_echo_activate_writer(state);
3310 }
3311
3312 req = smbd_echo_read_send(state, state->ev, state->xconn);
3313 if (req == NULL) {
3314 DEBUG(1, ("smbd_echo_read_send failed\n"));
3315 exit(1);
3316 }
3317 tevent_req_set_callback(req, smbd_echo_got_packet, state);
3318 }
3319
3320
3321 /*
3322 * Handle SMBecho requests in a forked child process
3323 */
3324 bool fork_echo_handler(struct smbXsrv_connection *xconn)
3325 {
3326 int listener_pipe[2];
3327 int res;
3328 pid_t child;
3329 bool use_mutex = false;
3330
3331 res = pipe(listener_pipe);
3332 if (res == -1) {
3333 DEBUG(1, ("pipe() failed: %s\n", strerror(errno)));
3334 return false;
3335 }
3336
3337 #ifdef HAVE_ROBUST_MUTEXES
3338 use_mutex = tdb_runtime_check_for_robust_mutexes();
3339
3340 if (use_mutex) {
3341 pthread_mutexattr_t a;
3342
3343 xconn->smb1.echo_handler.socket_mutex =
3344 anonymous_shared_allocate(sizeof(pthread_mutex_t));
3345 if (xconn->smb1.echo_handler.socket_mutex == NULL) {
3346 DEBUG(1, ("Could not create mutex shared memory: %s\n",
3347 strerror(errno)));
3348 goto fail;
3349 }
3350
3351 res = pthread_mutexattr_init(&a);
3352 if (res != 0) {
3353 DEBUG(1, ("pthread_mutexattr_init failed: %s\n",
3354 strerror(res)));
3355 goto fail;
3356 }
3357 res = pthread_mutexattr_settype(&a, PTHREAD_MUTEX_ERRORCHECK);
3358 if (res != 0) {
3359 DEBUG(1, ("pthread_mutexattr_settype failed: %s\n",
3360 strerror(res)));
3361 pthread_mutexattr_destroy(&a);
3362 goto fail;
3363 }
3364 res = pthread_mutexattr_setpshared(&a, PTHREAD_PROCESS_SHARED);
3365 if (res != 0) {
3366 DEBUG(1, ("pthread_mutexattr_setpshared failed: %s\n",
3367 strerror(res)));
3368 pthread_mutexattr_destroy(&a);
3369 goto fail;
3370 }
3371 res = pthread_mutexattr_setrobust(&a, PTHREAD_MUTEX_ROBUST);
3372 if (res != 0) {
3373 DEBUG(1, ("pthread_mutexattr_setrobust failed: "
3374 "%s\n", strerror(res)));
3375 pthread_mutexattr_destroy(&a);
3376 goto fail;
3377 }
3378 res = pthread_mutex_init(xconn->smb1.echo_handler.socket_mutex,
3379 &a);
3380 pthread_mutexattr_destroy(&a);
3381 if (res != 0) {
3382 DEBUG(1, ("pthread_mutex_init failed: %s\n",
3383 strerror(res)));
3384 goto fail;
3385 }
3386 }
3387 #endif
3388
3389 if (!use_mutex) {
3390 xconn->smb1.echo_handler.socket_lock_fd =
3391 create_unlink_tmp(lp_lock_directory());
3392 if (xconn->smb1.echo_handler.socket_lock_fd == -1) {
3393 DEBUG(1, ("Could not create lock fd: %s\n",
3394 strerror(errno)));
3395 goto fail;
3396 }
3397 }
3398
3399 child = fork();
3400 if (child == 0) {
3401 NTSTATUS status;
3402
3403 close(listener_pipe[0]);
3404 set_blocking(listener_pipe[1], false);
3405
3406 status = smbd_reinit_after_fork(xconn->msg_ctx, xconn->ev_ctx,
3407 true, "smbd-echo");
3408 if (!NT_STATUS_IS_OK(status)) {
3409 DEBUG(1, ("reinit_after_fork failed: %s\n",
3410 nt_errstr(status)));
3411 exit(1);
3412 }
3413 smbd_echo_loop(xconn, listener_pipe[1]);
3414 exit(0);
3415 }
3416 close(listener_pipe[1]);
3417 listener_pipe[1] = -1;
3418 xconn->smb1.echo_handler.trusted_fd = listener_pipe[0];
3419
3420 DEBUG(10,("fork_echo_handler: main[%d] echo_child[%d]\n", (int)getpid(), (int)child));
3421
3422 /*
3423 * Without smb signing this is the same as the normal smbd
3424 * listener. This needs to change once signing comes in.
3425 */
3426 xconn->smb1.echo_handler.trusted_fde = tevent_add_fd(xconn->ev_ctx,
3427 xconn,
3428 xconn->smb1.echo_handler.trusted_fd,
3429 TEVENT_FD_READ,
3430 smbd_server_echo_handler,
3431 xconn);
3432 if (xconn->smb1.echo_handler.trusted_fde == NULL) {
3433 DEBUG(1, ("event_add_fd failed\n"));
3434 goto fail;
3435 }
3436
3437 return true;
3438
3439 fail:
3440 if (listener_pipe[0] != -1) {
3441 close(listener_pipe[0]);
3442 }
3443 if (listener_pipe[1] != -1) {
3444 close(listener_pipe[1]);
3445 }
3446 if (xconn->smb1.echo_handler.socket_lock_fd != -1) {
3447 close(xconn->smb1.echo_handler.socket_lock_fd);
3448 }
3449 #ifdef HAVE_ROBUST_MUTEXES
3450 if (xconn->smb1.echo_handler.socket_mutex != NULL) {
3451 pthread_mutex_destroy(xconn->smb1.echo_handler.socket_mutex);
3452 anonymous_shared_free(xconn->smb1.echo_handler.socket_mutex);
3453 }
3454 #endif
3455 smbd_echo_init(xconn);
3456
3457 return false;
3458 }
3459
3460 static bool uid_in_use(const struct user_struct *user, uid_t uid)
3461 {
3462 while (user) {
3463 if (user->session_info &&
3464 (user->session_info->unix_token->uid == uid)) {
3465 return true;
3466 }
3467 user = user->next;
3468 }
3469 return false;
3470 }
3471
3472 static bool gid_in_use(const struct user_struct *user, gid_t gid)
3473 {
3474 while (user) {
3475 if (user->session_info != NULL) {
3476 int i;
3477 struct security_unix_token *utok;
3478
3479 utok = user->session_info->unix_token;
3480 if (utok->gid == gid) {
3481 return true;
3482 }
3483 for(i=0; i<utok->ngroups; i++) {
3484 if (utok->groups[i] == gid) {
3485 return true;
3486 }
3487 }
3488 }
3489 user = user->next;
3490 }
3491 return false;
3492 }
3493
3494 static bool sid_in_use(const struct user_struct *user,
3495 const struct dom_sid *psid)
3496 {
3497 while (user) {
3498 struct security_token *tok;
3499
3500 if (user->session_info == NULL) {
3501 continue;
3502 }
3503 tok = user->session_info->security_token;
3504 if (tok == NULL) {
3505 /*
3506 * Not sure session_info->security_token can
3507 * ever be NULL. This check might be not
3508 * necessary.
3509 */
3510 continue;
3511 }
3512 if (security_token_has_sid(tok, psid)) {
3513 return true;
3514 }
3515 user = user->next;
3516 }
3517 return false;
3518 }
3519
3520 static bool id_in_use(const struct user_struct *user,
3521 const struct id_cache_ref *id)
3522 {
3523 switch(id->type) {
3524 case UID:
3525 return uid_in_use(user, id->id.uid);
3526 case GID:
3527 return gid_in_use(user, id->id.gid);
3528 case SID:
3529 return sid_in_use(user, &id->id.sid);
3530 default:
3531 break;
3532 }
3533 return false;
3534 }
3535
3536 static void smbd_id_cache_kill(struct messaging_context *msg_ctx,
3537 void *private_data,
3538 uint32_t msg_type,
3539 struct server_id server_id,
3540 DATA_BLOB* data)
3541 {
3542 const char *msg = (data && data->data)
3543 ? (const char *)data->data : "<NULL>";
3544 struct id_cache_ref id;
3545 struct smbd_server_connection *sconn =
3546 talloc_get_type_abort(private_data,
3547 struct smbd_server_connection);
3548
3549 if (!id_cache_ref_parse(msg, &id)) {
3550 DEBUG(0, ("Invalid ?ID: %s\n", msg));
3551 return;
3552 }
3553
3554 if (id_in_use(sconn->users, &id)) {
3555 exit_server_cleanly(msg);
3556 }
3557 id_cache_delete_from_cache(&id);
3558 }
3559
3560 NTSTATUS smbXsrv_connection_init_tables(struct smbXsrv_connection *conn,
3561 enum protocol_types protocol)
3562 {
3563 NTSTATUS status;
3564
3565 conn->protocol = protocol;
3566
3567 if (conn->client->session_table != NULL) {
3568 return NT_STATUS_OK;
3569 }
3570
3571 if (protocol >= PROTOCOL_SMB2_02) {
3572 status = smb2srv_session_table_init(conn);
3573 if (!NT_STATUS_IS_OK(status)) {
3574 conn->protocol = PROTOCOL_NONE;
3575 return status;
3576 }
3577
3578 status = smb2srv_open_table_init(conn);
3579 if (!NT_STATUS_IS_OK(status)) {
3580 conn->protocol = PROTOCOL_NONE;
3581 return status;
3582 }
3583 } else {
3584 status = smb1srv_session_table_init(conn);
3585 if (!NT_STATUS_IS_OK(status)) {
3586 conn->protocol = PROTOCOL_NONE;
3587 return status;
3588 }
3589
3590 status = smb1srv_tcon_table_init(conn);
3591 if (!NT_STATUS_IS_OK(status)) {
3592 conn->protocol = PROTOCOL_NONE;
3593 return status;
3594 }
3595
3596 status = smb1srv_open_table_init(conn);
3597 if (!NT_STATUS_IS_OK(status)) {
3598 conn->protocol = PROTOCOL_NONE;
3599 return status;
3600 }
3601 }
3602
3603 set_Protocol(protocol);
3604 return NT_STATUS_OK;
3605 }
3606
3607 struct smbd_tevent_trace_state {
3608 struct tevent_context *ev;
3609 TALLOC_CTX *frame;
3610 SMBPROFILE_BASIC_ASYNC_STATE(profile_idle);
3611 };
3612
3613 static void smbd_tevent_trace_callback(enum tevent_trace_point point,
3614 void *private_data)
3615 {
3616 struct smbd_tevent_trace_state *state =
3617 (struct smbd_tevent_trace_state *)private_data;
3618
3619 switch (point) {
3620 case TEVENT_TRACE_BEFORE_WAIT:
3621 if (!smbprofile_dump_pending()) {
3622 /*
3623 * If there's no dump pending
3624 * we don't want to schedule a new 1 sec timer.
3625 *
3626 * Instead we want to sleep as long as nothing happens.
3627 */
3628 smbprofile_dump_setup(NULL);
3629 }
3630 SMBPROFILE_BASIC_ASYNC_START(idle, profile_p, state->profile_idle);
3631 break;
3632 case TEVENT_TRACE_AFTER_WAIT:
3633 SMBPROFILE_BASIC_ASYNC_END(state->profile_idle);
3634 if (!smbprofile_dump_pending()) {
3635 /*
3636 * We need to flush our state after sleeping
3637 * (hopefully a long time).
3638 */
3639 smbprofile_dump();
3640 /*
3641 * future profiling events should trigger timers
3642 * on our main event context.
3643 */
3644 smbprofile_dump_setup(state->ev);
3645 }
3646 break;
3647 case TEVENT_TRACE_BEFORE_LOOP_ONCE:
3648 TALLOC_FREE(state->frame);
3649 state->frame = talloc_stackframe_pool(8192);
3650 break;
3651 case TEVENT_TRACE_AFTER_LOOP_ONCE:
3652 TALLOC_FREE(state->frame);
3653 break;
3654 }
3655
3656 errno = 0;
3657 }
3658
3659 /**
3660 * Create a debug string for the connection
3661 *
3662 * This is allocated to talloc_tos() or a string constant
3663 * in certain corner cases. The returned string should
3664 * hence not be free'd directly but only via the talloc stack.
3665 */
3666 const char *smbXsrv_connection_dbg(const struct smbXsrv_connection *xconn)
3667 {
3668 const char *ret;
3669
3670 /*
3671 * TODO: this can be improved later
3672 * maybe including the client guid or more
3673 */
3674 ret = tsocket_address_string(xconn->remote_address, talloc_tos());
3675 if (ret == NULL) {
3676 return "<tsocket_address_string() failed>";
3677 }
3678
3679 return ret;
3680 }
3681
3682 NTSTATUS smbd_add_connection(struct smbXsrv_client *client, int sock_fd,
3683 struct smbXsrv_connection **_xconn)
3684 {
3685 TALLOC_CTX *frame = talloc_stackframe();
3686 struct smbXsrv_connection *xconn;
3687 struct sockaddr_storage ss_srv;
3688 void *sp_srv = (void *)&ss_srv;
3689 struct sockaddr *sa_srv = (struct sockaddr *)sp_srv;
3690 struct sockaddr_storage ss_clnt;
3691 void *sp_clnt = (void *)&ss_clnt;
3692 struct sockaddr *sa_clnt = (struct sockaddr *)sp_clnt;
3693 socklen_t sa_socklen;
3694 struct tsocket_address *local_address = NULL;
3695 struct tsocket_address *remote_address = NULL;
3696 const char *remaddr = NULL;
3697 char *p;
3698 const char *rhost = NULL;
3699 int ret;
3700 int tmp;
3701
3702 *_xconn = NULL;
3703
3704 DO_PROFILE_INC(connect);
3705
3706 xconn = talloc_zero(client, struct smbXsrv_connection);
3707 if (xconn == NULL) {
3708 DEBUG(0,("talloc_zero(struct smbXsrv_connection)\n"));
3709 TALLOC_FREE(frame);
3710 return NT_STATUS_NO_MEMORY;
3711 }
3712 talloc_steal(frame, xconn);
3713
3714 xconn->ev_ctx = client->ev_ctx;
3715 xconn->msg_ctx = client->msg_ctx;
3716 xconn->transport.sock = sock_fd;
3717 smbd_echo_init(xconn);
3718 xconn->protocol = PROTOCOL_NONE;
3719
3720 /* Ensure child is set to blocking mode */
3721 set_blocking(sock_fd,True);
3722
3723 set_socket_options(sock_fd, "SO_KEEPALIVE");
3724 set_socket_options(sock_fd, lp_socket_options());
3725
3726 sa_socklen = sizeof(ss_clnt);
3727 ret = getpeername(sock_fd, sa_clnt, &sa_socklen);
3728 if (ret != 0) {
3729 int saved_errno = errno;
3730 int level = (errno == ENOTCONN)?2:0;
3731 DEBUG(level,("getpeername() failed - %s\n",
3732 strerror(saved_errno)));
3733 TALLOC_FREE(frame);
3734 return map_nt_error_from_unix_common(saved_errno);
3735 }
3736 ret = tsocket_address_bsd_from_sockaddr(xconn,
3737 sa_clnt, sa_socklen,
3738 &remote_address);
3739 if (ret != 0) {
3740 int saved_errno = errno;
3741 DEBUG(0,("%s: tsocket_address_bsd_from_sockaddr remote failed - %s\n",
3742 __location__, strerror(saved_errno)));
3743 TALLOC_FREE(frame);
3744 return map_nt_error_from_unix_common(saved_errno);
3745 }
3746
3747 sa_socklen = sizeof(ss_srv);
3748 ret = getsockname(sock_fd, sa_srv, &sa_socklen);
3749 if (ret != 0) {
3750 int saved_errno = errno;
3751 int level = (errno == ENOTCONN)?2:0;
3752 DEBUG(level,("getsockname() failed - %s\n",
3753 strerror(saved_errno)));
3754 TALLOC_FREE(frame);
3755 return map_nt_error_from_unix_common(saved_errno);
3756 }
3757 ret = tsocket_address_bsd_from_sockaddr(xconn,
3758 sa_srv, sa_socklen,
3759 &local_address);
3760 if (ret != 0) {
3761 int saved_errno = errno;
3762 DEBUG(0,("%s: tsocket_address_bsd_from_sockaddr remote failed - %s\n",
3763 __location__, strerror(saved_errno)));
3764 TALLOC_FREE(frame);
3765 return map_nt_error_from_unix_common(saved_errno);
3766 }
3767
3768 if (tsocket_address_is_inet(remote_address, "ip")) {
3769 remaddr = tsocket_address_inet_addr_string(remote_address,
3770 talloc_tos());
3771 if (remaddr == NULL) {
3772 DEBUG(0,("%s: tsocket_address_inet_addr_string remote failed - %s\n",
3773 __location__, strerror(errno)));
3774 TALLOC_FREE(frame);
3775 return NT_STATUS_NO_MEMORY;
3776 }
3777 } else {
3778 remaddr = "0.0.0.0";
3779 }
3780
3781 /*
3782 * Before the first packet, check the global hosts allow/ hosts deny
3783 * parameters before doing any parsing of packets passed to us by the
3784 * client. This prevents attacks on our parsing code from hosts not in
3785 * the hosts allow list.
3786 */
3787
3788 ret = get_remote_hostname(remote_address,
3789 &p, talloc_tos());
3790 if (ret < 0) {
3791 int saved_errno = errno;
3792 DEBUG(0,("%s: get_remote_hostname failed - %s\n",
3793 __location__, strerror(saved_errno)));
3794 TALLOC_FREE(frame);
3795 return map_nt_error_from_unix_common(saved_errno);
3796 }
3797 rhost = p;
3798 if (strequal(rhost, "UNKNOWN")) {
3799 rhost = remaddr;
3800 }
3801
3802 xconn->local_address = local_address;
3803 xconn->remote_address = remote_address;
3804 xconn->remote_hostname = talloc_strdup(xconn, rhost);
3805 if (xconn->remote_hostname == NULL) {
3806 return NT_STATUS_NO_MEMORY;
3807 }
3808
3809 if (!srv_init_signing(xconn)) {
3810 DEBUG(0, ("Failed to init smb_signing\n"));
3811 TALLOC_FREE(frame);
3812 return NT_STATUS_INTERNAL_ERROR;
3813 }
3814
3815 if (!allow_access(lp_hosts_deny(-1), lp_hosts_allow(-1),
3816 xconn->remote_hostname,
3817 remaddr)) {
3818 DEBUG( 1, ("Connection denied from %s to %s\n",
3819 tsocket_address_string(remote_address, talloc_tos()),
3820 tsocket_address_string(local_address, talloc_tos())));
3821
3822 /*
3823 * We return a valid xconn
3824 * so that the caller can return an error message
3825 * to the client
3826 */
3827 client->connections = xconn;
3828 xconn->client = client;
3829 talloc_steal(client, xconn);
3830
3831 *_xconn = xconn;
3832 TALLOC_FREE(frame);
3833 return NT_STATUS_NETWORK_ACCESS_DENIED;
3834 }
3835
3836 DEBUG(10, ("Connection allowed from %s to %s\n",
3837 tsocket_address_string(remote_address, talloc_tos()),
3838 tsocket_address_string(local_address, talloc_tos())));
3839
3840 if (lp_clustering()) {
3841 /*
3842 * We need to tell ctdb about our client's TCP
3843 * connection, so that for failover ctdbd can send
3844 * tickle acks, triggering a reconnection by the
3845 * client.
3846 */
3847 NTSTATUS status;
3848
3849 status = smbd_register_ips(xconn, &ss_srv, &ss_clnt);
3850 if (!NT_STATUS_IS_OK(status)) {
3851 DEBUG(0, ("ctdbd_register_ips failed: %s\n",
3852 nt_errstr(status)));
3853 }
3854 }
3855
3856 tmp = lp_max_xmit();
3857 tmp = MAX(tmp, SMB_BUFFER_SIZE_MIN);
3858 tmp = MIN(tmp, SMB_BUFFER_SIZE_MAX);
3859
3860 xconn->smb1.negprot.max_recv = tmp;
3861
3862 xconn->smb1.sessions.done_sesssetup = false;
3863 xconn->smb1.sessions.max_send = SMB_BUFFER_SIZE_MAX;
3864
3865 xconn->transport.fde = tevent_add_fd(client->ev_ctx,
3866 xconn,
3867 sock_fd,
3868 TEVENT_FD_READ,
3869 smbd_server_connection_handler,
3870 xconn);
3871 if (!xconn->transport.fde) {
3872 TALLOC_FREE(frame);
3873 return NT_STATUS_NO_MEMORY;
3874 }
3875
3876 /* for now we only have one connection */
3877 DLIST_ADD_END(client->connections, xconn);
3878 xconn->client = client;
3879 talloc_steal(client, xconn);
3880
3881 *_xconn = xconn;
3882 TALLOC_FREE(frame);
3883 return NT_STATUS_OK;
3884 }
3885
3886 /****************************************************************************
3887 Process commands from the client
3888 ****************************************************************************/
3889
3890 void smbd_process(struct tevent_context *ev_ctx,
3891 struct messaging_context *msg_ctx,
3892 int sock_fd,
3893 bool interactive)
3894 {
3895 struct smbd_tevent_trace_state trace_state = {
3896 .ev = ev_ctx,
3897 .frame = talloc_stackframe(),
3898 };
3899 struct smbXsrv_client *client = NULL;
3900 struct smbd_server_connection *sconn = NULL;
3901 struct smbXsrv_connection *xconn = NULL;
3902 const char *locaddr = NULL;
3903 const char *remaddr = NULL;
3904 int ret;
3905 NTSTATUS status;
3906 struct timeval tv = timeval_current();
3907 NTTIME now = timeval_to_nttime(&tv);
3908 char *chroot_dir = NULL;
3909 int rc;
3910
3911 status = smbXsrv_client_create(ev_ctx, ev_ctx, msg_ctx, now, &client);
3912 if (!NT_STATUS_IS_OK(status)) {
3913 DBG_ERR("smbXsrv_client_create(): %s\n", nt_errstr(status));
3914 exit_server_cleanly("talloc_zero(struct smbXsrv_client).\n");
3915 }
3916
3917 /*
3918 * TODO: remove this...:-)
3919 */
3920 global_smbXsrv_client = client;
3921
3922 sconn = talloc_zero(client, struct smbd_server_connection);
3923 if (sconn == NULL) {
3924 exit_server("failed to create smbd_server_connection");
3925 }
3926
3927 client->sconn = sconn;
3928 sconn->client = client;
3929
3930 sconn->ev_ctx = ev_ctx;
3931 sconn->msg_ctx = msg_ctx;
3932
3933 if (lp_server_max_protocol() >= PROTOCOL_SMB2_02) {
3934 /*
3935 * We're not making the decision here,
3936 * we're just allowing the client
3937 * to decide between SMB1 and SMB2
3938 * with the first negprot
3939 * packet.
3940 */
3941 sconn->using_smb2 = true;
3942 }
3943
3944 if (!interactive) {
3945 smbd_setup_sig_term_handler(sconn);
3946 smbd_setup_sig_hup_handler(sconn);
3947
3948 if (!serverid_register(messaging_server_id(msg_ctx),
3949 FLAG_MSG_GENERAL|FLAG_MSG_SMBD
3950 |FLAG_MSG_DBWRAP
3951 |FLAG_MSG_PRINT_GENERAL)) {
3952 exit_server_cleanly("Could not register myself in "
3953 "serverid.tdb");
3954 }
3955 }
3956
3957 status = smbd_add_connection(client, sock_fd, &xconn);
3958 if (NT_STATUS_EQUAL(status, NT_STATUS_NETWORK_ACCESS_DENIED)) {
3959 /*
3960 * send a negative session response "not listening on calling
3961 * name"
3962 */
3963 unsigned char buf[5] = {0x83, 0, 0, 1, 0x81};
3964 (void)srv_send_smb(xconn,(char *)buf, false,
3965 0, false, NULL);
3966 exit_server_cleanly("connection denied");
3967 } else if (!NT_STATUS_IS_OK(status)) {
3968 exit_server_cleanly(nt_errstr(status));
3969 }
3970
3971 sconn->local_address =
3972 tsocket_address_copy(xconn->local_address, sconn);
3973 if (sconn->local_address == NULL) {
3974 exit_server_cleanly("tsocket_address_copy() failed");
3975 }
3976 sconn->remote_address =
3977 tsocket_address_copy(xconn->remote_address, sconn);
3978 if (sconn->remote_address == NULL) {
3979 exit_server_cleanly("tsocket_address_copy() failed");
3980 }
3981 sconn->remote_hostname =
3982 talloc_strdup(sconn, xconn->remote_hostname);
3983 if (sconn->remote_hostname == NULL) {
3984 exit_server_cleanly("tsocket_strdup() failed");
3985 }
3986
3987 if (tsocket_address_is_inet(sconn->local_address, "ip")) {
3988 locaddr = tsocket_address_inet_addr_string(
3989 sconn->local_address,
3990 talloc_tos());
3991 if (locaddr == NULL) {
3992 DEBUG(0,("%s: tsocket_address_inet_addr_string remote failed - %s\n",
3993 __location__, strerror(errno)));
3994 exit_server_cleanly("tsocket_address_inet_addr_string remote failed.\n");
3995 }
3996 } else {
3997 locaddr = "0.0.0.0";
3998 }
3999
4000 if (tsocket_address_is_inet(sconn->remote_address, "ip")) {
4001 remaddr = tsocket_address_inet_addr_string(
4002 sconn->remote_address,
4003 talloc_tos());
4004 if (remaddr == NULL) {
4005 DEBUG(0,("%s: tsocket_address_inet_addr_string remote failed - %s\n",
4006 __location__, strerror(errno)));
4007 exit_server_cleanly("tsocket_address_inet_addr_string remote failed.\n");
4008 }
4009 } else {
4010 remaddr = "0.0.0.0";
4011 }
4012
4013 /* this is needed so that we get decent entries
4014 in smbstatus for port 445 connects */
4015 set_remote_machine_name(remaddr, false);
4016 reload_services(sconn, conn_snum_used, true);
4017 sub_set_socket_ids(remaddr,
4018 sconn->remote_hostname,
4019 locaddr);
4020
4021 if (lp_preload_modules()) {
4022 smb_load_all_modules_absoute_path(lp_preload_modules());
4023 }
4024
4025 smb_perfcount_init();
4026
4027 if (!init_account_policy()) {
4028 exit_server("Could not open account policy tdb.\n");
4029 }
4030
4031 chroot_dir = lp_root_directory(talloc_tos());
4032 if (chroot_dir[0] != '\0') {
4033 rc = chdir(chroot_dir);
4034 if (rc != 0) {
4035 DBG_ERR("Failed to chdir to %s\n", chroot_dir);
4036 exit_server("Failed to chdir()");
4037 }
4038
4039 rc = chroot(chroot_dir);
4040 if (rc != 0) {
4041 DBG_ERR("Failed to change root to %s\n", chroot_dir);
4042 exit_server("Failed to chroot()");
4043 }
4044 DBG_WARNING("Changed root to %s\n", chroot_dir);
4045
4046 TALLOC_FREE(chroot_dir);
4047 }
4048
4049 if (!file_init(sconn)) {
4050 exit_server("file_init() failed");
4051 }
4052
4053 /* Setup oplocks */
4054 if (!init_oplocks(sconn))
4055 exit_server("Failed to init oplocks");
4056
4057 /* register our message handlers */
4058 messaging_register(sconn->msg_ctx, sconn,
4059 MSG_SMB_FORCE_TDIS, msg_force_tdis);
4060 messaging_register(sconn->msg_ctx, sconn,
4061 MSG_SMB_CLOSE_FILE, msg_close_file);
4062 messaging_register(sconn->msg_ctx, sconn,
4063 MSG_SMB_FILE_RENAME, msg_file_was_renamed);
4064
4065 id_cache_register_msgs(sconn->msg_ctx);
4066 messaging_deregister(sconn->msg_ctx, ID_CACHE_KILL, NULL);
4067 messaging_register(sconn->msg_ctx, sconn,
4068 ID_CACHE_KILL, smbd_id_cache_kill);
4069
4070 messaging_deregister(sconn->msg_ctx,
4071 MSG_SMB_CONF_UPDATED, sconn->ev_ctx);
4072 messaging_register(sconn->msg_ctx, sconn,
4073 MSG_SMB_CONF_UPDATED, smbd_conf_updated);
4074
4075 messaging_deregister(sconn->msg_ctx, MSG_SMB_KILL_CLIENT_IP,
4076 NULL);
4077 messaging_register(sconn->msg_ctx, sconn,
4078 MSG_SMB_KILL_CLIENT_IP,
4079 msg_kill_client_ip);
4080
4081 messaging_deregister(sconn->msg_ctx, MSG_SMB_TELL_NUM_CHILDREN, NULL);
4082
4083 /*
4084 * Use the default MSG_DEBUG handler to avoid rebroadcasting
4085 * MSGs to all child processes
4086 */
4087 messaging_deregister(sconn->msg_ctx,
4088 MSG_DEBUG, NULL);
4089 messaging_register(sconn->msg_ctx, NULL,
4090 MSG_DEBUG, debug_message);
4091
4092 if ((lp_keepalive() != 0)
4093 && !(event_add_idle(ev_ctx, NULL,
4094 timeval_set(lp_keepalive(), 0),
4095 "keepalive", keepalive_fn,
4096 sconn))) {
4097 DEBUG(0, ("Could not add keepalive event\n"));
4098 exit(1);
4099 }
4100
4101 if (!(event_add_idle(ev_ctx, NULL,
4102 timeval_set(IDLE_CLOSED_TIMEOUT, 0),
4103 "deadtime", deadtime_fn, sconn))) {
4104 DEBUG(0, ("Could not add deadtime event\n"));
4105 exit(1);
4106 }
4107
4108 if (!(event_add_idle(ev_ctx, NULL,
4109 timeval_set(SMBD_HOUSEKEEPING_INTERVAL, 0),
4110 "housekeeping", housekeeping_fn, sconn))) {
4111 DEBUG(0, ("Could not add housekeeping event\n"));
4112 exit(1);
4113 }
4114
4115 smbprofile_dump_setup(ev_ctx);
4116
4117 if (!init_dptrs(sconn)) {
4118 exit_server("init_dptrs() failed");
4119 }
4120
4121 TALLOC_FREE(trace_state.frame);
4122
4123 tevent_set_trace_callback(ev_ctx, smbd_tevent_trace_callback,
4124 &trace_state);
4125
4126 ret = tevent_loop_wait(ev_ctx);
4127 if (ret != 0) {
4128 DEBUG(1, ("tevent_loop_wait failed: %d, %s,"
4129 " exiting\n", ret, strerror(errno)));
4130 }
4131
4132 TALLOC_FREE(trace_state.frame);
4133
4134 exit_server_cleanly(NULL);
4135 }
4136
4137 bool req_is_in_chain(const struct smb_request *req)
4138 {
4139 if (req->vwv != (const uint16_t *)(req->inbuf+smb_vwv)) {
4140 /*
4141 * We're right now handling a subsequent request, so we must
4142 * be in a chain
4143 */
4144 return true;
4145 }
4146
4147 if (!is_andx_req(req->cmd)) {
4148 return false;
4149 }
4150
4151 if (req->wct < 2) {
4152 /*
4153 * Okay, an illegal request, but definitely not chained :-)
4154 */
4155 return false;
4156 }
4157
4158 return (CVAL(req->vwv+0, 0) != 0xFF);
4159 }
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