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
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.
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.
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/>.
24 * Size of data we can send to client. Set
25 * by the client for all protocols above CORE.
26 * Set by us for CORE protocol.
28 int max_send = BUFFER_SIZE;
30 * Size of the data we can receive. Set by us.
31 * Can be modified by the max xmit parameter.
33 int max_recv = BUFFER_SIZE;
35 SIG_ATOMIC_T reload_after_sighup = 0;
36 SIG_ATOMIC_T got_sig_term = 0;
37 extern bool global_machine_password_needs_changing;
40 static void construct_reply_common(struct smb_request *req, const char *inbuf,
43 /* Accessor function for smb_read_error for smbd functions. */
45 /****************************************************************************
47 ****************************************************************************/
49 bool srv_send_smb(int fd, char *buffer, bool do_encrypt)
54 char *buf_out = buffer;
56 /* Sign the outgoing packet if required. */
57 srv_calculate_sign_mac(buf_out);
60 NTSTATUS status = srv_encrypt_buffer(buffer, &buf_out);
61 if (!NT_STATUS_IS_OK(status)) {
62 DEBUG(0, ("send_smb: SMB encryption failed "
63 "on outgoing packet! Error %s\n",
69 len = smb_len(buf_out) + 4;
71 while (nwritten < len) {
72 ret = write_data(fd,buf_out+nwritten,len - nwritten);
74 DEBUG(0,("Error writing %d bytes to client. %d. (%s)\n",
75 (int)len,(int)ret, strerror(errno) ));
76 srv_free_enc_buffer(buf_out);
82 srv_free_enc_buffer(buf_out);
86 /*******************************************************************
87 Setup the word count and byte count for a smb message.
88 ********************************************************************/
90 int srv_set_message(char *buf,
95 if (zero && (num_words || num_bytes)) {
96 memset(buf + smb_size,'\0',num_words*2 + num_bytes);
98 SCVAL(buf,smb_wct,num_words);
99 SSVAL(buf,smb_vwv + num_words*SIZEOFWORD,num_bytes);
100 smb_setlen(buf,(smb_size + num_words*2 + num_bytes - 4));
101 return (smb_size + num_words*2 + num_bytes);
104 static bool valid_smb_header(const uint8_t *inbuf)
106 if (is_encrypted_packet(inbuf)) {
110 * This used to be (strncmp(smb_base(inbuf),"\377SMB",4) == 0)
111 * but it just looks weird to call strncmp for this one.
113 return (IVAL(smb_base(inbuf), 0) == 0x424D53FF);
116 /* Socket functions for smbd packet processing. */
118 static bool valid_packet_size(size_t len)
121 * A WRITEX with CAP_LARGE_WRITEX can be 64k worth of data plus 65 bytes
122 * of header. Don't print the error if this fits.... JRA.
125 if (len > (BUFFER_SIZE + LARGE_WRITEX_HDR_SIZE)) {
126 DEBUG(0,("Invalid packet length! (%lu bytes).\n",
127 (unsigned long)len));
133 static NTSTATUS read_packet_remainder(int fd, char *buffer,
134 unsigned int timeout, ssize_t len)
140 return read_socket_with_timeout(fd, buffer, len, len, timeout, NULL);
143 /****************************************************************************
144 Attempt a zerocopy writeX read. We know here that len > smb_size-4
145 ****************************************************************************/
148 * Unfortunately, earlier versions of smbclient/libsmbclient
149 * don't send this "standard" writeX header. I've fixed this
150 * for 3.2 but we'll use the old method with earlier versions.
151 * Windows and CIFSFS at least use this standard size. Not
155 #define STANDARD_WRITE_AND_X_HEADER_SIZE (smb_size - 4 + /* basic header */ \
156 (2*14) + /* word count (including bcc) */ \
159 static NTSTATUS receive_smb_raw_talloc_partial_read(TALLOC_CTX *mem_ctx,
160 const char lenbuf[4],
161 int fd, char **buffer,
162 unsigned int timeout,
166 /* Size of a WRITEX call (+4 byte len). */
167 char writeX_header[4 + STANDARD_WRITE_AND_X_HEADER_SIZE];
168 ssize_t len = smb_len_large(lenbuf); /* Could be a UNIX large writeX. */
172 memcpy(writeX_header, lenbuf, 4);
174 status = read_socket_with_timeout(
175 fd, writeX_header + 4,
176 STANDARD_WRITE_AND_X_HEADER_SIZE,
177 STANDARD_WRITE_AND_X_HEADER_SIZE,
180 if (!NT_STATUS_IS_OK(status)) {
185 * Ok - now try and see if this is a possible
189 if (is_valid_writeX_buffer((uint8_t *)writeX_header)) {
191 * If the data offset is beyond what
192 * we've read, drain the extra bytes.
194 uint16_t doff = SVAL(writeX_header,smb_vwv11);
197 if (doff > STANDARD_WRITE_AND_X_HEADER_SIZE) {
198 size_t drain = doff - STANDARD_WRITE_AND_X_HEADER_SIZE;
199 if (drain_socket(smbd_server_fd(), drain) != drain) {
200 smb_panic("receive_smb_raw_talloc_partial_read:"
201 " failed to drain pending bytes");
204 doff = STANDARD_WRITE_AND_X_HEADER_SIZE;
207 /* Spoof down the length and null out the bcc. */
208 set_message_bcc(writeX_header, 0);
209 newlen = smb_len(writeX_header);
211 /* Copy the header we've written. */
213 *buffer = (char *)TALLOC_MEMDUP(mem_ctx,
215 sizeof(writeX_header));
217 if (*buffer == NULL) {
218 DEBUG(0, ("Could not allocate inbuf of length %d\n",
219 (int)sizeof(writeX_header)));
220 return NT_STATUS_NO_MEMORY;
223 /* Work out the remaining bytes. */
224 *p_unread = len - STANDARD_WRITE_AND_X_HEADER_SIZE;
225 *len_ret = newlen + 4;
229 if (!valid_packet_size(len)) {
230 return NT_STATUS_INVALID_PARAMETER;
234 * Not a valid writeX call. Just do the standard
238 *buffer = TALLOC_ARRAY(mem_ctx, char, len+4);
240 if (*buffer == NULL) {
241 DEBUG(0, ("Could not allocate inbuf of length %d\n",
243 return NT_STATUS_NO_MEMORY;
246 /* Copy in what we already read. */
249 4 + STANDARD_WRITE_AND_X_HEADER_SIZE);
250 toread = len - STANDARD_WRITE_AND_X_HEADER_SIZE;
253 status = read_packet_remainder(
254 fd, (*buffer) + 4 + STANDARD_WRITE_AND_X_HEADER_SIZE,
257 if (!NT_STATUS_IS_OK(status)) {
258 DEBUG(10, ("receive_smb_raw_talloc_partial_read: %s\n",
268 static NTSTATUS receive_smb_raw_talloc(TALLOC_CTX *mem_ctx, int fd,
269 char **buffer, unsigned int timeout,
270 size_t *p_unread, size_t *plen)
274 int min_recv_size = lp_min_receive_file_size();
279 status = read_smb_length_return_keepalive(fd, lenbuf, timeout, &len);
280 if (!NT_STATUS_IS_OK(status)) {
281 DEBUG(10, ("receive_smb_raw: %s\n", nt_errstr(status)));
285 if (CVAL(lenbuf,0) == 0 &&
287 smb_len_large(lenbuf) > min_recv_size && /* Could be a UNIX large writeX. */
288 !srv_is_signing_active()) {
290 return receive_smb_raw_talloc_partial_read(
291 mem_ctx, lenbuf, fd, buffer, timeout, p_unread, plen);
294 if (!valid_packet_size(len)) {
295 return NT_STATUS_INVALID_PARAMETER;
299 * The +4 here can't wrap, we've checked the length above already.
302 *buffer = TALLOC_ARRAY(mem_ctx, char, len+4);
304 if (*buffer == NULL) {
305 DEBUG(0, ("Could not allocate inbuf of length %d\n",
307 return NT_STATUS_NO_MEMORY;
310 memcpy(*buffer, lenbuf, sizeof(lenbuf));
312 status = read_packet_remainder(fd, (*buffer)+4, timeout, len);
313 if (!NT_STATUS_IS_OK(status)) {
321 static NTSTATUS receive_smb_talloc(TALLOC_CTX *mem_ctx, int fd,
322 char **buffer, unsigned int timeout,
323 size_t *p_unread, bool *p_encrypted,
329 *p_encrypted = false;
331 status = receive_smb_raw_talloc(mem_ctx, fd, buffer, timeout,
333 if (!NT_STATUS_IS_OK(status)) {
337 if (is_encrypted_packet((uint8_t *)*buffer)) {
338 status = srv_decrypt_buffer(*buffer);
339 if (!NT_STATUS_IS_OK(status)) {
340 DEBUG(0, ("receive_smb_talloc: SMB decryption failed on "
341 "incoming packet! Error %s\n",
342 nt_errstr(status) ));
348 /* Check the incoming SMB signature. */
349 if (!srv_check_sign_mac(*buffer, true)) {
350 DEBUG(0, ("receive_smb: SMB Signature verification failed on "
351 "incoming packet!\n"));
352 return NT_STATUS_INVALID_NETWORK_RESPONSE;
360 * Initialize a struct smb_request from an inbuf
363 void init_smb_request(struct smb_request *req,
368 size_t req_size = smb_len(inbuf) + 4;
369 /* Ensure we have at least smb_size bytes. */
370 if (req_size < smb_size) {
371 DEBUG(0,("init_smb_request: invalid request size %u\n",
372 (unsigned int)req_size ));
373 exit_server_cleanly("Invalid SMB request");
375 req->cmd = CVAL(inbuf, smb_com);
376 req->flags2 = SVAL(inbuf, smb_flg2);
377 req->smbpid = SVAL(inbuf, smb_pid);
378 req->mid = SVAL(inbuf, smb_mid);
379 req->vuid = SVAL(inbuf, smb_uid);
380 req->tid = SVAL(inbuf, smb_tid);
381 req->wct = CVAL(inbuf, smb_wct);
382 req->vwv = (uint16_t *)(inbuf+smb_vwv);
383 req->buflen = smb_buflen(inbuf);
384 req->buf = (const uint8_t *)smb_buf(inbuf);
385 req->unread_bytes = unread_bytes;
386 req->encrypted = encrypted;
387 req->conn = conn_find(req->tid);
388 req->chain_fsp = NULL;
390 /* Ensure we have at least wct words and 2 bytes of bcc. */
391 if (smb_size + req->wct*2 > req_size) {
392 DEBUG(0,("init_smb_request: invalid wct number %u (size %u)\n",
393 (unsigned int)req->wct,
394 (unsigned int)req_size));
395 exit_server_cleanly("Invalid SMB request");
397 /* Ensure bcc is correct. */
398 if (((uint8 *)smb_buf(inbuf)) + req->buflen > inbuf + req_size) {
399 DEBUG(0,("init_smb_request: invalid bcc number %u "
400 "(wct = %u, size %u)\n",
401 (unsigned int)req->buflen,
402 (unsigned int)req->wct,
403 (unsigned int)req_size));
404 exit_server_cleanly("Invalid SMB request");
409 /****************************************************************************
410 structure to hold a linked list of queued messages.
412 ****************************************************************************/
414 static struct pending_message_list *deferred_open_queue;
416 /****************************************************************************
417 Function to push a message onto the tail of a linked list of smb messages ready
419 ****************************************************************************/
421 static bool push_queued_message(struct smb_request *req,
422 struct timeval request_time,
423 struct timeval end_time,
424 char *private_data, size_t private_len)
426 int msg_len = smb_len(req->inbuf) + 4;
427 struct pending_message_list *msg;
429 msg = TALLOC_ZERO_P(NULL, struct pending_message_list);
432 DEBUG(0,("push_message: malloc fail (1)\n"));
436 msg->buf = data_blob_talloc(msg, req->inbuf, msg_len);
437 if(msg->buf.data == NULL) {
438 DEBUG(0,("push_message: malloc fail (2)\n"));
443 msg->request_time = request_time;
444 msg->end_time = end_time;
445 msg->encrypted = req->encrypted;
448 msg->private_data = data_blob_talloc(msg, private_data,
450 if (msg->private_data.data == NULL) {
451 DEBUG(0,("push_message: malloc fail (3)\n"));
457 DLIST_ADD_END(deferred_open_queue, msg, struct pending_message_list *);
459 DEBUG(10,("push_message: pushed message length %u on "
460 "deferred_open_queue\n", (unsigned int)msg_len));
465 /****************************************************************************
466 Function to delete a sharing violation open message by mid.
467 ****************************************************************************/
469 void remove_deferred_open_smb_message(uint16 mid)
471 struct pending_message_list *pml;
473 for (pml = deferred_open_queue; pml; pml = pml->next) {
474 if (mid == SVAL(pml->buf.data,smb_mid)) {
475 DEBUG(10,("remove_sharing_violation_open_smb_message: "
476 "deleting mid %u len %u\n",
478 (unsigned int)pml->buf.length ));
479 DLIST_REMOVE(deferred_open_queue, pml);
486 /****************************************************************************
487 Move a sharing violation open retry message to the front of the list and
488 schedule it for immediate processing.
489 ****************************************************************************/
491 void schedule_deferred_open_smb_message(uint16 mid)
493 struct pending_message_list *pml;
496 for (pml = deferred_open_queue; pml; pml = pml->next) {
497 uint16 msg_mid = SVAL(pml->buf.data,smb_mid);
498 DEBUG(10,("schedule_deferred_open_smb_message: [%d] msg_mid = %u\n", i++,
499 (unsigned int)msg_mid ));
500 if (mid == msg_mid) {
501 DEBUG(10,("schedule_deferred_open_smb_message: scheduling mid %u\n",
503 pml->end_time.tv_sec = 0;
504 pml->end_time.tv_usec = 0;
505 DLIST_PROMOTE(deferred_open_queue, pml);
510 DEBUG(10,("schedule_deferred_open_smb_message: failed to find message mid %u\n",
514 /****************************************************************************
515 Return true if this mid is on the deferred queue.
516 ****************************************************************************/
518 bool open_was_deferred(uint16 mid)
520 struct pending_message_list *pml;
522 for (pml = deferred_open_queue; pml; pml = pml->next) {
523 if (SVAL(pml->buf.data,smb_mid) == mid) {
530 /****************************************************************************
531 Return the message queued by this mid.
532 ****************************************************************************/
534 struct pending_message_list *get_open_deferred_message(uint16 mid)
536 struct pending_message_list *pml;
538 for (pml = deferred_open_queue; pml; pml = pml->next) {
539 if (SVAL(pml->buf.data,smb_mid) == mid) {
546 /****************************************************************************
547 Function to push a deferred open smb message onto a linked list of local smb
548 messages ready for processing.
549 ****************************************************************************/
551 bool push_deferred_smb_message(struct smb_request *req,
552 struct timeval request_time,
553 struct timeval timeout,
554 char *private_data, size_t priv_len)
556 struct timeval end_time;
558 if (req->unread_bytes) {
559 DEBUG(0,("push_deferred_smb_message: logic error ! "
560 "unread_bytes = %u\n",
561 (unsigned int)req->unread_bytes ));
562 smb_panic("push_deferred_smb_message: "
563 "logic error unread_bytes != 0" );
566 end_time = timeval_sum(&request_time, &timeout);
568 DEBUG(10,("push_deferred_open_smb_message: pushing message len %u mid %u "
569 "timeout time [%u.%06u]\n",
570 (unsigned int) smb_len(req->inbuf)+4, (unsigned int)req->mid,
571 (unsigned int)end_time.tv_sec,
572 (unsigned int)end_time.tv_usec));
574 return push_queued_message(req, request_time, end_time,
575 private_data, priv_len);
579 struct timed_event *te;
580 struct timeval interval;
582 bool (*handler)(const struct timeval *now, void *private_data);
586 static void idle_event_handler(struct event_context *ctx,
587 struct timed_event *te,
588 const struct timeval *now,
591 struct idle_event *event =
592 talloc_get_type_abort(private_data, struct idle_event);
594 TALLOC_FREE(event->te);
596 if (!event->handler(now, event->private_data)) {
597 /* Don't repeat, delete ourselves */
602 event->te = event_add_timed(ctx, event,
603 timeval_sum(now, &event->interval),
605 idle_event_handler, event);
607 /* We can't do much but fail here. */
608 SMB_ASSERT(event->te != NULL);
611 struct idle_event *event_add_idle(struct event_context *event_ctx,
613 struct timeval interval,
615 bool (*handler)(const struct timeval *now,
619 struct idle_event *result;
620 struct timeval now = timeval_current();
622 result = TALLOC_P(mem_ctx, struct idle_event);
623 if (result == NULL) {
624 DEBUG(0, ("talloc failed\n"));
628 result->interval = interval;
629 result->handler = handler;
630 result->private_data = private_data;
632 if (!(result->name = talloc_asprintf(result, "idle_evt(%s)", name))) {
633 DEBUG(0, ("talloc failed\n"));
638 result->te = event_add_timed(event_ctx, result,
639 timeval_sum(&now, &interval),
641 idle_event_handler, result);
642 if (result->te == NULL) {
643 DEBUG(0, ("event_add_timed failed\n"));
651 /****************************************************************************
652 Do all async processing in here. This includes kernel oplock messages, change
654 ****************************************************************************/
656 static void async_processing(fd_set *pfds)
658 DEBUG(10,("async_processing: Doing async processing.\n"));
662 process_kernel_oplocks(smbd_messaging_context(), pfds);
664 /* Do the aio check again after receive_local_message as it does a
665 select and may have eaten our signal. */
666 /* Is this till true? -- vl */
670 exit_server_cleanly("termination signal");
673 /* check for sighup processing */
674 if (reload_after_sighup) {
675 change_to_root_user();
676 DEBUG(1,("Reloading services after SIGHUP\n"));
677 reload_services(False);
678 reload_after_sighup = 0;
682 /****************************************************************************
683 Add a fd to the set we will be select(2)ing on.
684 ****************************************************************************/
686 static int select_on_fd(int fd, int maxfd, fd_set *fds)
690 maxfd = MAX(maxfd, fd);
696 /****************************************************************************
697 Do a select on an two fd's - with timeout.
699 If a local udp message has been pushed onto the
700 queue (this can only happen during oplock break
701 processing) call async_processing()
703 If a pending smb message has been pushed onto the
704 queue (this can only happen during oplock break
705 processing) return this next.
707 If the first smbfd is ready then read an smb from it.
708 if the second (loopback UDP) fd is ready then read a message
709 from it and setup the buffer header to identify the length
711 Returns False on timeout or error.
714 The timeout is in milliseconds
715 ****************************************************************************/
717 static NTSTATUS receive_message_or_smb(TALLOC_CTX *mem_ctx, char **buffer,
719 size_t *p_unread, bool *p_encrypted)
732 to.tv_sec = SMBD_SELECT_TIMEOUT;
736 * Note that this call must be before processing any SMB
737 * messages as we need to synchronously process any messages
738 * we may have sent to ourselves from the previous SMB.
740 message_dispatch(smbd_messaging_context());
743 * Check to see if we already have a message on the deferred open queue
744 * and it's time to schedule.
746 if(deferred_open_queue != NULL) {
747 bool pop_message = False;
748 struct pending_message_list *msg = deferred_open_queue;
750 if (timeval_is_zero(&msg->end_time)) {
757 tdif = usec_time_diff(&msg->end_time, &tv);
759 /* Timed out. Schedule...*/
761 DEBUG(10,("receive_message_or_smb: queued message timed out.\n"));
763 /* Make a more accurate select timeout. */
764 to.tv_sec = tdif / 1000000;
765 to.tv_usec = tdif % 1000000;
766 DEBUG(10,("receive_message_or_smb: select with timeout of [%u.%06u]\n",
767 (unsigned int)to.tv_sec, (unsigned int)to.tv_usec ));
773 *buffer = (char *)talloc_memdup(mem_ctx, msg->buf.data,
775 if (*buffer == NULL) {
776 DEBUG(0, ("talloc failed\n"));
777 return NT_STATUS_NO_MEMORY;
779 *buffer_len = msg->buf.length;
780 *p_encrypted = msg->encrypted;
782 /* We leave this message on the queue so the open code can
783 know this is a retry. */
784 DEBUG(5,("receive_message_or_smb: returning deferred open smb message.\n"));
790 * Setup the select fd sets.
797 * Ensure we process oplock break messages by preference.
798 * We have to do this before the select, after the select
799 * and if the select returns EINTR. This is due to the fact
800 * that the selects called from async_processing can eat an EINTR
801 * caused by a signal (we can't take the break message there).
802 * This is hideously complex - *MUST* be simplified for 3.0 ! JRA.
805 if (oplock_message_waiting(&r_fds)) {
806 DEBUG(10,("receive_message_or_smb: oplock_message is waiting.\n"));
807 async_processing(&r_fds);
809 * After async processing we must go and do the select again, as
810 * the state of the flag in fds for the server file descriptor is
811 * indeterminate - we may have done I/O on it in the oplock processing. JRA.
817 * Are there any timed events waiting ? If so, ensure we don't
818 * select for longer than it would take to wait for them.
825 event_add_to_select_args(smbd_event_context(), &now,
826 &r_fds, &w_fds, &to, &maxfd);
829 if (timeval_is_zero(&to)) {
830 /* Process a timed event now... */
831 if (run_events(smbd_event_context(), 0, NULL, NULL)) {
838 START_PROFILE(smbd_idle);
840 maxfd = select_on_fd(smbd_server_fd(), maxfd, &r_fds);
841 maxfd = select_on_fd(oplock_notify_fd(), maxfd, &r_fds);
843 selrtn = sys_select(maxfd+1,&r_fds,&w_fds,NULL,&to);
846 END_PROFILE(smbd_idle);
850 if (run_events(smbd_event_context(), selrtn, &r_fds, &w_fds)) {
854 /* if we get EINTR then maybe we have received an oplock
855 signal - treat this as select returning 1. This is ugly, but
856 is the best we can do until the oplock code knows more about
858 if (selrtn == -1 && errno == EINTR) {
859 async_processing(&r_fds);
861 * After async processing we must go and do the select again, as
862 * the state of the flag in fds for the server file descriptor is
863 * indeterminate - we may have done I/O on it in the oplock processing. JRA.
870 /* something is wrong. Maybe the socket is dead? */
871 return map_nt_error_from_unix(errno);
874 /* Did we timeout ? */
880 * Ensure we process oplock break messages by preference.
881 * This is IMPORTANT ! Otherwise we can starve other processes
882 * sending us an oplock break message. JRA.
885 if (oplock_message_waiting(&r_fds)) {
886 async_processing(&r_fds);
888 * After async processing we must go and do the select again, as
889 * the state of the flag in fds for the server file descriptor is
890 * indeterminate - we may have done I/O on it in the oplock processing. JRA.
896 * We've just woken up from a protentially long select sleep.
897 * Ensure we process local messages as we need to synchronously
898 * process any messages from other smbd's to avoid file rename race
899 * conditions. This call is cheap if there are no messages waiting.
902 message_dispatch(smbd_messaging_context());
904 status = receive_smb_talloc(mem_ctx, smbd_server_fd(), buffer, 0,
905 p_unread, p_encrypted, &len);
907 if (!NT_STATUS_IS_OK(status)) {
917 * Only allow 5 outstanding trans requests. We're allocating memory, so
921 NTSTATUS allow_new_trans(struct trans_state *list, int mid)
924 for (; list != NULL; list = list->next) {
926 if (list->mid == mid) {
927 return NT_STATUS_INVALID_PARAMETER;
933 return NT_STATUS_INSUFFICIENT_RESOURCES;
939 /****************************************************************************
940 We're terminating and have closed all our files/connections etc.
941 If there are any pending local messages we need to respond to them
942 before termination so that other smbds don't think we just died whilst
944 ****************************************************************************/
946 void respond_to_all_remaining_local_messages(void)
949 * Assert we have no exclusive open oplocks.
952 if(get_number_of_exclusive_open_oplocks()) {
953 DEBUG(0,("respond_to_all_remaining_local_messages: PANIC : we have %d exclusive oplocks.\n",
954 get_number_of_exclusive_open_oplocks() ));
958 process_kernel_oplocks(smbd_messaging_context(), NULL);
965 These flags determine some of the permissions required to do an operation
967 Note that I don't set NEED_WRITE on some write operations because they
968 are used by some brain-dead clients when printing, and I don't want to
969 force write permissions on print services.
971 #define AS_USER (1<<0)
972 #define NEED_WRITE (1<<1) /* Must be paired with AS_USER */
973 #define TIME_INIT (1<<2)
974 #define CAN_IPC (1<<3) /* Must be paired with AS_USER */
975 #define AS_GUEST (1<<5) /* Must *NOT* be paired with AS_USER */
976 #define DO_CHDIR (1<<6)
979 define a list of possible SMB messages and their corresponding
980 functions. Any message that has a NULL function is unimplemented -
981 please feel free to contribute implementations!
983 static const struct smb_message_struct {
985 void (*fn)(struct smb_request *req);
987 } smb_messages[256] = {
989 /* 0x00 */ { "SMBmkdir",reply_mkdir,AS_USER | NEED_WRITE},
990 /* 0x01 */ { "SMBrmdir",reply_rmdir,AS_USER | NEED_WRITE},
991 /* 0x02 */ { "SMBopen",reply_open,AS_USER },
992 /* 0x03 */ { "SMBcreate",reply_mknew,AS_USER},
993 /* 0x04 */ { "SMBclose",reply_close,AS_USER | CAN_IPC },
994 /* 0x05 */ { "SMBflush",reply_flush,AS_USER},
995 /* 0x06 */ { "SMBunlink",reply_unlink,AS_USER | NEED_WRITE },
996 /* 0x07 */ { "SMBmv",reply_mv,AS_USER | NEED_WRITE },
997 /* 0x08 */ { "SMBgetatr",reply_getatr,AS_USER},
998 /* 0x09 */ { "SMBsetatr",reply_setatr,AS_USER | NEED_WRITE},
999 /* 0x0a */ { "SMBread",reply_read,AS_USER},
1000 /* 0x0b */ { "SMBwrite",reply_write,AS_USER | CAN_IPC },
1001 /* 0x0c */ { "SMBlock",reply_lock,AS_USER},
1002 /* 0x0d */ { "SMBunlock",reply_unlock,AS_USER},
1003 /* 0x0e */ { "SMBctemp",reply_ctemp,AS_USER },
1004 /* 0x0f */ { "SMBmknew",reply_mknew,AS_USER},
1005 /* 0x10 */ { "SMBcheckpath",reply_checkpath,AS_USER},
1006 /* 0x11 */ { "SMBexit",reply_exit,DO_CHDIR},
1007 /* 0x12 */ { "SMBlseek",reply_lseek,AS_USER},
1008 /* 0x13 */ { "SMBlockread",reply_lockread,AS_USER},
1009 /* 0x14 */ { "SMBwriteunlock",reply_writeunlock,AS_USER},
1010 /* 0x15 */ { NULL, NULL, 0 },
1011 /* 0x16 */ { NULL, NULL, 0 },
1012 /* 0x17 */ { NULL, NULL, 0 },
1013 /* 0x18 */ { NULL, NULL, 0 },
1014 /* 0x19 */ { NULL, NULL, 0 },
1015 /* 0x1a */ { "SMBreadbraw",reply_readbraw,AS_USER},
1016 /* 0x1b */ { "SMBreadBmpx",reply_readbmpx,AS_USER},
1017 /* 0x1c */ { "SMBreadBs",reply_readbs,AS_USER },
1018 /* 0x1d */ { "SMBwritebraw",reply_writebraw,AS_USER},
1019 /* 0x1e */ { "SMBwriteBmpx",reply_writebmpx,AS_USER},
1020 /* 0x1f */ { "SMBwriteBs",reply_writebs,AS_USER},
1021 /* 0x20 */ { "SMBwritec", NULL,0},
1022 /* 0x21 */ { NULL, NULL, 0 },
1023 /* 0x22 */ { "SMBsetattrE",reply_setattrE,AS_USER | NEED_WRITE },
1024 /* 0x23 */ { "SMBgetattrE",reply_getattrE,AS_USER },
1025 /* 0x24 */ { "SMBlockingX",reply_lockingX,AS_USER },
1026 /* 0x25 */ { "SMBtrans",reply_trans,AS_USER | CAN_IPC },
1027 /* 0x26 */ { "SMBtranss",reply_transs,AS_USER | CAN_IPC},
1028 /* 0x27 */ { "SMBioctl",reply_ioctl,0},
1029 /* 0x28 */ { "SMBioctls", NULL,AS_USER},
1030 /* 0x29 */ { "SMBcopy",reply_copy,AS_USER | NEED_WRITE },
1031 /* 0x2a */ { "SMBmove", NULL,AS_USER | NEED_WRITE },
1032 /* 0x2b */ { "SMBecho",reply_echo,0},
1033 /* 0x2c */ { "SMBwriteclose",reply_writeclose,AS_USER},
1034 /* 0x2d */ { "SMBopenX",reply_open_and_X,AS_USER | CAN_IPC },
1035 /* 0x2e */ { "SMBreadX",reply_read_and_X,AS_USER | CAN_IPC },
1036 /* 0x2f */ { "SMBwriteX",reply_write_and_X,AS_USER | CAN_IPC },
1037 /* 0x30 */ { NULL, NULL, 0 },
1038 /* 0x31 */ { NULL, NULL, 0 },
1039 /* 0x32 */ { "SMBtrans2",reply_trans2, AS_USER | CAN_IPC },
1040 /* 0x33 */ { "SMBtranss2",reply_transs2, AS_USER},
1041 /* 0x34 */ { "SMBfindclose",reply_findclose,AS_USER},
1042 /* 0x35 */ { "SMBfindnclose",reply_findnclose,AS_USER},
1043 /* 0x36 */ { NULL, NULL, 0 },
1044 /* 0x37 */ { NULL, NULL, 0 },
1045 /* 0x38 */ { NULL, NULL, 0 },
1046 /* 0x39 */ { NULL, NULL, 0 },
1047 /* 0x3a */ { NULL, NULL, 0 },
1048 /* 0x3b */ { NULL, NULL, 0 },
1049 /* 0x3c */ { NULL, NULL, 0 },
1050 /* 0x3d */ { NULL, NULL, 0 },
1051 /* 0x3e */ { NULL, NULL, 0 },
1052 /* 0x3f */ { NULL, NULL, 0 },
1053 /* 0x40 */ { NULL, NULL, 0 },
1054 /* 0x41 */ { NULL, NULL, 0 },
1055 /* 0x42 */ { NULL, NULL, 0 },
1056 /* 0x43 */ { NULL, NULL, 0 },
1057 /* 0x44 */ { NULL, NULL, 0 },
1058 /* 0x45 */ { NULL, NULL, 0 },
1059 /* 0x46 */ { NULL, NULL, 0 },
1060 /* 0x47 */ { NULL, NULL, 0 },
1061 /* 0x48 */ { NULL, NULL, 0 },
1062 /* 0x49 */ { NULL, NULL, 0 },
1063 /* 0x4a */ { NULL, NULL, 0 },
1064 /* 0x4b */ { NULL, NULL, 0 },
1065 /* 0x4c */ { NULL, NULL, 0 },
1066 /* 0x4d */ { NULL, NULL, 0 },
1067 /* 0x4e */ { NULL, NULL, 0 },
1068 /* 0x4f */ { NULL, NULL, 0 },
1069 /* 0x50 */ { NULL, NULL, 0 },
1070 /* 0x51 */ { NULL, NULL, 0 },
1071 /* 0x52 */ { NULL, NULL, 0 },
1072 /* 0x53 */ { NULL, NULL, 0 },
1073 /* 0x54 */ { NULL, NULL, 0 },
1074 /* 0x55 */ { NULL, NULL, 0 },
1075 /* 0x56 */ { NULL, NULL, 0 },
1076 /* 0x57 */ { NULL, NULL, 0 },
1077 /* 0x58 */ { NULL, NULL, 0 },
1078 /* 0x59 */ { NULL, NULL, 0 },
1079 /* 0x5a */ { NULL, NULL, 0 },
1080 /* 0x5b */ { NULL, NULL, 0 },
1081 /* 0x5c */ { NULL, NULL, 0 },
1082 /* 0x5d */ { NULL, NULL, 0 },
1083 /* 0x5e */ { NULL, NULL, 0 },
1084 /* 0x5f */ { NULL, NULL, 0 },
1085 /* 0x60 */ { NULL, NULL, 0 },
1086 /* 0x61 */ { NULL, NULL, 0 },
1087 /* 0x62 */ { NULL, NULL, 0 },
1088 /* 0x63 */ { NULL, NULL, 0 },
1089 /* 0x64 */ { NULL, NULL, 0 },
1090 /* 0x65 */ { NULL, NULL, 0 },
1091 /* 0x66 */ { NULL, NULL, 0 },
1092 /* 0x67 */ { NULL, NULL, 0 },
1093 /* 0x68 */ { NULL, NULL, 0 },
1094 /* 0x69 */ { NULL, NULL, 0 },
1095 /* 0x6a */ { NULL, NULL, 0 },
1096 /* 0x6b */ { NULL, NULL, 0 },
1097 /* 0x6c */ { NULL, NULL, 0 },
1098 /* 0x6d */ { NULL, NULL, 0 },
1099 /* 0x6e */ { NULL, NULL, 0 },
1100 /* 0x6f */ { NULL, NULL, 0 },
1101 /* 0x70 */ { "SMBtcon",reply_tcon,0},
1102 /* 0x71 */ { "SMBtdis",reply_tdis,DO_CHDIR},
1103 /* 0x72 */ { "SMBnegprot",reply_negprot,0},
1104 /* 0x73 */ { "SMBsesssetupX",reply_sesssetup_and_X,0},
1105 /* 0x74 */ { "SMBulogoffX",reply_ulogoffX, 0}, /* ulogoff doesn't give a valid TID */
1106 /* 0x75 */ { "SMBtconX",reply_tcon_and_X,0},
1107 /* 0x76 */ { NULL, NULL, 0 },
1108 /* 0x77 */ { NULL, NULL, 0 },
1109 /* 0x78 */ { NULL, NULL, 0 },
1110 /* 0x79 */ { NULL, NULL, 0 },
1111 /* 0x7a */ { NULL, NULL, 0 },
1112 /* 0x7b */ { NULL, NULL, 0 },
1113 /* 0x7c */ { NULL, NULL, 0 },
1114 /* 0x7d */ { NULL, NULL, 0 },
1115 /* 0x7e */ { NULL, NULL, 0 },
1116 /* 0x7f */ { NULL, NULL, 0 },
1117 /* 0x80 */ { "SMBdskattr",reply_dskattr,AS_USER},
1118 /* 0x81 */ { "SMBsearch",reply_search,AS_USER},
1119 /* 0x82 */ { "SMBffirst",reply_search,AS_USER},
1120 /* 0x83 */ { "SMBfunique",reply_search,AS_USER},
1121 /* 0x84 */ { "SMBfclose",reply_fclose,AS_USER},
1122 /* 0x85 */ { NULL, NULL, 0 },
1123 /* 0x86 */ { NULL, NULL, 0 },
1124 /* 0x87 */ { NULL, NULL, 0 },
1125 /* 0x88 */ { NULL, NULL, 0 },
1126 /* 0x89 */ { NULL, NULL, 0 },
1127 /* 0x8a */ { NULL, NULL, 0 },
1128 /* 0x8b */ { NULL, NULL, 0 },
1129 /* 0x8c */ { NULL, NULL, 0 },
1130 /* 0x8d */ { NULL, NULL, 0 },
1131 /* 0x8e */ { NULL, NULL, 0 },
1132 /* 0x8f */ { NULL, NULL, 0 },
1133 /* 0x90 */ { NULL, NULL, 0 },
1134 /* 0x91 */ { NULL, NULL, 0 },
1135 /* 0x92 */ { NULL, NULL, 0 },
1136 /* 0x93 */ { NULL, NULL, 0 },
1137 /* 0x94 */ { NULL, NULL, 0 },
1138 /* 0x95 */ { NULL, NULL, 0 },
1139 /* 0x96 */ { NULL, NULL, 0 },
1140 /* 0x97 */ { NULL, NULL, 0 },
1141 /* 0x98 */ { NULL, NULL, 0 },
1142 /* 0x99 */ { NULL, NULL, 0 },
1143 /* 0x9a */ { NULL, NULL, 0 },
1144 /* 0x9b */ { NULL, NULL, 0 },
1145 /* 0x9c */ { NULL, NULL, 0 },
1146 /* 0x9d */ { NULL, NULL, 0 },
1147 /* 0x9e */ { NULL, NULL, 0 },
1148 /* 0x9f */ { NULL, NULL, 0 },
1149 /* 0xa0 */ { "SMBnttrans",reply_nttrans, AS_USER | CAN_IPC },
1150 /* 0xa1 */ { "SMBnttranss",reply_nttranss, AS_USER | CAN_IPC },
1151 /* 0xa2 */ { "SMBntcreateX",reply_ntcreate_and_X, AS_USER | CAN_IPC },
1152 /* 0xa3 */ { NULL, NULL, 0 },
1153 /* 0xa4 */ { "SMBntcancel",reply_ntcancel, 0 },
1154 /* 0xa5 */ { "SMBntrename",reply_ntrename, AS_USER | NEED_WRITE },
1155 /* 0xa6 */ { NULL, NULL, 0 },
1156 /* 0xa7 */ { NULL, NULL, 0 },
1157 /* 0xa8 */ { NULL, NULL, 0 },
1158 /* 0xa9 */ { NULL, NULL, 0 },
1159 /* 0xaa */ { NULL, NULL, 0 },
1160 /* 0xab */ { NULL, NULL, 0 },
1161 /* 0xac */ { NULL, NULL, 0 },
1162 /* 0xad */ { NULL, NULL, 0 },
1163 /* 0xae */ { NULL, NULL, 0 },
1164 /* 0xaf */ { NULL, NULL, 0 },
1165 /* 0xb0 */ { NULL, NULL, 0 },
1166 /* 0xb1 */ { NULL, NULL, 0 },
1167 /* 0xb2 */ { NULL, NULL, 0 },
1168 /* 0xb3 */ { NULL, NULL, 0 },
1169 /* 0xb4 */ { NULL, NULL, 0 },
1170 /* 0xb5 */ { NULL, NULL, 0 },
1171 /* 0xb6 */ { NULL, NULL, 0 },
1172 /* 0xb7 */ { NULL, NULL, 0 },
1173 /* 0xb8 */ { NULL, NULL, 0 },
1174 /* 0xb9 */ { NULL, NULL, 0 },
1175 /* 0xba */ { NULL, NULL, 0 },
1176 /* 0xbb */ { NULL, NULL, 0 },
1177 /* 0xbc */ { NULL, NULL, 0 },
1178 /* 0xbd */ { NULL, NULL, 0 },
1179 /* 0xbe */ { NULL, NULL, 0 },
1180 /* 0xbf */ { NULL, NULL, 0 },
1181 /* 0xc0 */ { "SMBsplopen",reply_printopen,AS_USER},
1182 /* 0xc1 */ { "SMBsplwr",reply_printwrite,AS_USER},
1183 /* 0xc2 */ { "SMBsplclose",reply_printclose,AS_USER},
1184 /* 0xc3 */ { "SMBsplretq",reply_printqueue,AS_USER},
1185 /* 0xc4 */ { NULL, NULL, 0 },
1186 /* 0xc5 */ { NULL, NULL, 0 },
1187 /* 0xc6 */ { NULL, NULL, 0 },
1188 /* 0xc7 */ { NULL, NULL, 0 },
1189 /* 0xc8 */ { NULL, NULL, 0 },
1190 /* 0xc9 */ { NULL, NULL, 0 },
1191 /* 0xca */ { NULL, NULL, 0 },
1192 /* 0xcb */ { NULL, NULL, 0 },
1193 /* 0xcc */ { NULL, NULL, 0 },
1194 /* 0xcd */ { NULL, NULL, 0 },
1195 /* 0xce */ { NULL, NULL, 0 },
1196 /* 0xcf */ { NULL, NULL, 0 },
1197 /* 0xd0 */ { "SMBsends",reply_sends,AS_GUEST},
1198 /* 0xd1 */ { "SMBsendb", NULL,AS_GUEST},
1199 /* 0xd2 */ { "SMBfwdname", NULL,AS_GUEST},
1200 /* 0xd3 */ { "SMBcancelf", NULL,AS_GUEST},
1201 /* 0xd4 */ { "SMBgetmac", NULL,AS_GUEST},
1202 /* 0xd5 */ { "SMBsendstrt",reply_sendstrt,AS_GUEST},
1203 /* 0xd6 */ { "SMBsendend",reply_sendend,AS_GUEST},
1204 /* 0xd7 */ { "SMBsendtxt",reply_sendtxt,AS_GUEST},
1205 /* 0xd8 */ { NULL, NULL, 0 },
1206 /* 0xd9 */ { NULL, NULL, 0 },
1207 /* 0xda */ { NULL, NULL, 0 },
1208 /* 0xdb */ { NULL, NULL, 0 },
1209 /* 0xdc */ { NULL, NULL, 0 },
1210 /* 0xdd */ { NULL, NULL, 0 },
1211 /* 0xde */ { NULL, NULL, 0 },
1212 /* 0xdf */ { NULL, NULL, 0 },
1213 /* 0xe0 */ { NULL, NULL, 0 },
1214 /* 0xe1 */ { NULL, NULL, 0 },
1215 /* 0xe2 */ { NULL, NULL, 0 },
1216 /* 0xe3 */ { NULL, NULL, 0 },
1217 /* 0xe4 */ { NULL, NULL, 0 },
1218 /* 0xe5 */ { NULL, NULL, 0 },
1219 /* 0xe6 */ { NULL, NULL, 0 },
1220 /* 0xe7 */ { NULL, NULL, 0 },
1221 /* 0xe8 */ { NULL, NULL, 0 },
1222 /* 0xe9 */ { NULL, NULL, 0 },
1223 /* 0xea */ { NULL, NULL, 0 },
1224 /* 0xeb */ { NULL, NULL, 0 },
1225 /* 0xec */ { NULL, NULL, 0 },
1226 /* 0xed */ { NULL, NULL, 0 },
1227 /* 0xee */ { NULL, NULL, 0 },
1228 /* 0xef */ { NULL, NULL, 0 },
1229 /* 0xf0 */ { NULL, NULL, 0 },
1230 /* 0xf1 */ { NULL, NULL, 0 },
1231 /* 0xf2 */ { NULL, NULL, 0 },
1232 /* 0xf3 */ { NULL, NULL, 0 },
1233 /* 0xf4 */ { NULL, NULL, 0 },
1234 /* 0xf5 */ { NULL, NULL, 0 },
1235 /* 0xf6 */ { NULL, NULL, 0 },
1236 /* 0xf7 */ { NULL, NULL, 0 },
1237 /* 0xf8 */ { NULL, NULL, 0 },
1238 /* 0xf9 */ { NULL, NULL, 0 },
1239 /* 0xfa */ { NULL, NULL, 0 },
1240 /* 0xfb */ { NULL, NULL, 0 },
1241 /* 0xfc */ { NULL, NULL, 0 },
1242 /* 0xfd */ { NULL, NULL, 0 },
1243 /* 0xfe */ { NULL, NULL, 0 },
1244 /* 0xff */ { NULL, NULL, 0 }
1248 /*******************************************************************
1249 allocate and initialize a reply packet
1250 ********************************************************************/
1252 static bool create_outbuf(TALLOC_CTX *mem_ctx, struct smb_request *req,
1253 const char *inbuf, char **outbuf, uint8_t num_words,
1257 * Protect against integer wrap
1259 if ((num_bytes > 0xffffff)
1260 || ((num_bytes + smb_size + num_words*2) > 0xffffff)) {
1262 if (asprintf(&msg, "num_bytes too large: %u",
1263 (unsigned)num_bytes) == -1) {
1264 msg = CONST_DISCARD(char *, "num_bytes too large");
1269 *outbuf = TALLOC_ARRAY(mem_ctx, char,
1270 smb_size + num_words*2 + num_bytes);
1271 if (*outbuf == NULL) {
1275 construct_reply_common(req, inbuf, *outbuf);
1276 srv_set_message(*outbuf, num_words, num_bytes, false);
1278 * Zero out the word area, the caller has to take care of the bcc area
1281 if (num_words != 0) {
1282 memset(*outbuf + smb_vwv0, 0, num_words*2);
1288 void reply_outbuf(struct smb_request *req, uint8 num_words, uint32 num_bytes)
1291 if (!create_outbuf(req, req, (char *)req->inbuf, &outbuf, num_words,
1293 smb_panic("could not allocate output buffer\n");
1295 req->outbuf = (uint8_t *)outbuf;
1299 /*******************************************************************
1300 Dump a packet to a file.
1301 ********************************************************************/
1303 static void smb_dump(const char *name, int type, const char *data, ssize_t len)
1307 if (DEBUGLEVEL < 50) {
1311 if (len < 4) len = smb_len(data)+4;
1312 for (i=1;i<100;i++) {
1313 if (asprintf(&fname, "/tmp/%s.%d.%s", name, i,
1314 type ? "req" : "resp") == -1) {
1317 fd = open(fname, O_WRONLY|O_CREAT|O_EXCL, 0644);
1318 if (fd != -1 || errno != EEXIST) break;
1321 ssize_t ret = write(fd, data, len);
1323 DEBUG(0,("smb_dump: problem: write returned %d\n", (int)ret ));
1325 DEBUG(0,("created %s len %lu\n", fname, (unsigned long)len));
1330 /****************************************************************************
1331 Prepare everything for calling the actual request function, and potentially
1332 call the request function via the "new" interface.
1334 Return False if the "legacy" function needs to be called, everything is
1337 Return True if we're done.
1339 I know this API sucks, but it is the one with the least code change I could
1341 ****************************************************************************/
1343 static connection_struct *switch_message(uint8 type, struct smb_request *req, int size)
1347 connection_struct *conn = NULL;
1349 static uint16 last_session_tag = UID_FIELD_INVALID;
1353 /* Make sure this is an SMB packet. smb_size contains NetBIOS header
1354 * so subtract 4 from it. */
1355 if (!valid_smb_header(req->inbuf)
1356 || (size < (smb_size - 4))) {
1357 DEBUG(2,("Non-SMB packet of length %d. Terminating server\n",
1358 smb_len(req->inbuf)));
1359 exit_server_cleanly("Non-SMB packet");
1362 if (smb_messages[type].fn == NULL) {
1363 DEBUG(0,("Unknown message type %d!\n",type));
1364 smb_dump("Unknown", 1, (char *)req->inbuf, size);
1365 reply_unknown_new(req, type);
1369 flags = smb_messages[type].flags;
1371 /* In share mode security we must ignore the vuid. */
1372 session_tag = (lp_security() == SEC_SHARE)
1373 ? UID_FIELD_INVALID : req->vuid;
1376 DEBUG(3,("switch message %s (pid %d) conn 0x%lx\n", smb_fn_name(type),
1377 (int)sys_getpid(), (unsigned long)conn));
1379 smb_dump(smb_fn_name(type), 1, (char *)req->inbuf, size);
1381 /* Ensure this value is replaced in the incoming packet. */
1382 SSVAL(req->inbuf,smb_uid,session_tag);
1385 * Ensure the correct username is in current_user_info. This is a
1386 * really ugly bugfix for problems with multiple session_setup_and_X's
1387 * being done and allowing %U and %G substitutions to work correctly.
1388 * There is a reason this code is done here, don't move it unless you
1389 * know what you're doing... :-).
1393 if (session_tag != last_session_tag) {
1394 user_struct *vuser = NULL;
1396 last_session_tag = session_tag;
1397 if(session_tag != UID_FIELD_INVALID) {
1398 vuser = get_valid_user_struct(session_tag);
1400 set_current_user_info(
1401 vuser->server_info->sanitized_username,
1402 vuser->server_info->unix_name,
1403 pdb_get_fullname(vuser->server_info
1405 pdb_get_domain(vuser->server_info
1411 /* Does this call need to be run as the connected user? */
1412 if (flags & AS_USER) {
1414 /* Does this call need a valid tree connection? */
1417 * Amazingly, the error code depends on the command
1420 if (type == SMBntcreateX) {
1421 reply_nterror(req, NT_STATUS_INVALID_HANDLE);
1423 reply_doserror(req, ERRSRV, ERRinvnid);
1428 if (!change_to_user(conn,session_tag)) {
1429 reply_nterror(req, NT_STATUS_DOS(ERRSRV, ERRbaduid));
1430 remove_deferred_open_smb_message(req->mid);
1434 /* All NEED_WRITE and CAN_IPC flags must also have AS_USER. */
1436 /* Does it need write permission? */
1437 if ((flags & NEED_WRITE) && !CAN_WRITE(conn)) {
1438 reply_nterror(req, NT_STATUS_MEDIA_WRITE_PROTECTED);
1442 /* IPC services are limited */
1443 if (IS_IPC(conn) && !(flags & CAN_IPC)) {
1444 reply_doserror(req, ERRSRV,ERRaccess);
1448 /* This call needs to be run as root */
1449 change_to_root_user();
1452 /* load service specific parameters */
1454 if (req->encrypted) {
1455 conn->encrypted_tid = true;
1456 /* encrypted required from now on. */
1457 conn->encrypt_level = Required;
1458 } else if (ENCRYPTION_REQUIRED(conn)) {
1459 if (req->cmd != SMBtrans2 && req->cmd != SMBtranss2) {
1460 exit_server_cleanly("encryption required "
1466 if (!set_current_service(conn,SVAL(req->inbuf,smb_flg),
1467 (flags & (AS_USER|DO_CHDIR)
1469 reply_doserror(req, ERRSRV, ERRaccess);
1472 conn->num_smb_operations++;
1475 /* does this protocol need to be run as guest? */
1476 if ((flags & AS_GUEST)
1477 && (!change_to_guest() ||
1478 !check_access(smbd_server_fd(), lp_hostsallow(-1),
1479 lp_hostsdeny(-1)))) {
1480 reply_doserror(req, ERRSRV, ERRaccess);
1484 smb_messages[type].fn(req);
1488 /****************************************************************************
1489 Construct a reply to the incoming packet.
1490 ****************************************************************************/
1492 static void construct_reply(char *inbuf, int size, size_t unread_bytes, bool encrypted)
1494 connection_struct *conn;
1495 struct smb_request *req;
1499 if (!(req = talloc(talloc_tos(), struct smb_request))) {
1500 smb_panic("could not allocate smb_request");
1502 init_smb_request(req, (uint8 *)inbuf, unread_bytes, encrypted);
1503 req->inbuf = (uint8_t *)talloc_move(req, &inbuf);
1505 conn = switch_message(req->cmd, req, size);
1507 if (req->unread_bytes) {
1508 /* writeX failed. drain socket. */
1509 if (drain_socket(smbd_server_fd(), req->unread_bytes) !=
1510 req->unread_bytes) {
1511 smb_panic("failed to drain pending bytes");
1513 req->unread_bytes = 0;
1516 if (req->outbuf == NULL) {
1520 if (CVAL(req->outbuf,0) == 0) {
1521 show_msg((char *)req->outbuf);
1524 if (!srv_send_smb(smbd_server_fd(),
1525 (char *)req->outbuf,
1526 IS_CONN_ENCRYPTED(conn)||req->encrypted)) {
1527 exit_server_cleanly("construct_reply: srv_send_smb failed.");
1535 /****************************************************************************
1536 Process an smb from the client
1537 ****************************************************************************/
1539 static void process_smb(char *inbuf, size_t nread, size_t unread_bytes, bool encrypted)
1541 static int trans_num;
1542 int msg_type = CVAL(inbuf,0);
1544 DO_PROFILE_INC(smb_count);
1546 DEBUG( 6, ( "got message type 0x%x of len 0x%x\n", msg_type,
1548 DEBUG( 3, ( "Transaction %d of length %d (%u toread)\n", trans_num,
1550 (unsigned int)unread_bytes ));
1552 if (msg_type != 0) {
1554 * NetBIOS session request, keepalive, etc.
1556 reply_special(inbuf);
1562 construct_reply(inbuf,nread,unread_bytes,encrypted);
1567 /****************************************************************************
1568 Return a string containing the function name of a SMB command.
1569 ****************************************************************************/
1571 const char *smb_fn_name(int type)
1573 const char *unknown_name = "SMBunknown";
1575 if (smb_messages[type].name == NULL)
1576 return(unknown_name);
1578 return(smb_messages[type].name);
1581 /****************************************************************************
1582 Helper functions for contruct_reply.
1583 ****************************************************************************/
1585 static uint32 common_flags2 = FLAGS2_LONG_PATH_COMPONENTS|FLAGS2_32_BIT_ERROR_CODES;
1587 void add_to_common_flags2(uint32 v)
1592 void remove_from_common_flags2(uint32 v)
1594 common_flags2 &= ~v;
1597 static void construct_reply_common(struct smb_request *req, const char *inbuf,
1600 srv_set_message(outbuf,0,0,false);
1602 SCVAL(outbuf, smb_com, req->cmd);
1603 SIVAL(outbuf,smb_rcls,0);
1604 SCVAL(outbuf,smb_flg, FLAG_REPLY | (CVAL(inbuf,smb_flg) & FLAG_CASELESS_PATHNAMES));
1605 SSVAL(outbuf,smb_flg2,
1606 (SVAL(inbuf,smb_flg2) & FLAGS2_UNICODE_STRINGS) |
1608 memset(outbuf+smb_pidhigh,'\0',(smb_tid-smb_pidhigh));
1610 SSVAL(outbuf,smb_tid,SVAL(inbuf,smb_tid));
1611 SSVAL(outbuf,smb_pid,SVAL(inbuf,smb_pid));
1612 SSVAL(outbuf,smb_uid,SVAL(inbuf,smb_uid));
1613 SSVAL(outbuf,smb_mid,SVAL(inbuf,smb_mid));
1616 void construct_reply_common_req(struct smb_request *req, char *outbuf)
1618 construct_reply_common(req, (char *)req->inbuf, outbuf);
1621 /****************************************************************************
1622 Construct a chained reply and add it to the already made reply
1623 ****************************************************************************/
1625 void chain_reply(struct smb_request *req)
1627 static char *orig_inbuf;
1630 * Dirty little const_discard: We mess with req->inbuf, which is
1631 * declared as const. If maybe at some point this routine gets
1632 * rewritten, this const_discard could go away.
1634 char *inbuf = CONST_DISCARD(char *, req->inbuf);
1635 int size = smb_len(req->inbuf)+4;
1637 int smb_com1, smb_com2 = CVAL(inbuf,smb_vwv0);
1638 unsigned smb_off2 = SVAL(inbuf,smb_vwv1);
1642 char inbuf_saved[smb_wct];
1643 char *outbuf = (char *)req->outbuf;
1644 size_t outsize = smb_len(outbuf) + 4;
1645 size_t outsize_padded;
1647 size_t ofs, to_move;
1649 struct smb_request *req2;
1650 size_t caller_outputlen;
1651 char *caller_output;
1653 /* Maybe its not chained, or it's an error packet. */
1654 if (smb_com2 == 0xFF || SVAL(outbuf,smb_rcls) != 0) {
1655 SCVAL(outbuf,smb_vwv0,0xFF);
1659 if (chain_size == 0) {
1660 /* this is the first part of the chain */
1665 * We need to save the output the caller added to the chain so that we
1666 * can splice it into the final output buffer later.
1669 caller_outputlen = outsize - smb_wct;
1671 caller_output = (char *)memdup(outbuf + smb_wct, caller_outputlen);
1673 if (caller_output == NULL) {
1674 /* TODO: NT_STATUS_NO_MEMORY */
1675 smb_panic("could not dup outbuf");
1679 * The original Win95 redirector dies on a reply to
1680 * a lockingX and read chain unless the chain reply is
1681 * 4 byte aligned. JRA.
1684 outsize_padded = (outsize + 3) & ~3;
1685 padding = outsize_padded - outsize;
1688 * remember how much the caller added to the chain, only counting
1689 * stuff after the parameter words
1691 chain_size += (outsize_padded - smb_wct);
1694 * work out pointers into the original packets. The
1695 * headers on these need to be filled in
1697 inbuf2 = orig_inbuf + smb_off2 + 4 - smb_wct;
1699 /* remember the original command type */
1700 smb_com1 = CVAL(orig_inbuf,smb_com);
1702 /* save the data which will be overwritten by the new headers */
1703 memcpy(inbuf_saved,inbuf2,smb_wct);
1705 /* give the new packet the same header as the last part of the SMB */
1706 memmove(inbuf2,inbuf,smb_wct);
1708 /* create the in buffer */
1709 SCVAL(inbuf2,smb_com,smb_com2);
1711 /* work out the new size for the in buffer. */
1712 new_size = size - (inbuf2 - inbuf);
1714 DEBUG(0,("chain_reply: chain packet size incorrect "
1715 "(orig size = %d, offset = %d)\n",
1716 size, (int)(inbuf2 - inbuf) ));
1717 exit_server_cleanly("Bad chained packet");
1721 /* And set it in the header. */
1722 smb_setlen(inbuf2, new_size - 4);
1724 DEBUG(3,("Chained message\n"));
1727 if (!(req2 = talloc(talloc_tos(), struct smb_request))) {
1728 smb_panic("could not allocate smb_request");
1730 init_smb_request(req2, (uint8 *)inbuf2,0, req->encrypted);
1731 req2->inbuf = (uint8_t *)inbuf2;
1732 req2->chain_fsp = req->chain_fsp;
1734 /* process the request */
1735 switch_message(smb_com2, req2, new_size);
1738 * We don't accept deferred operations in chained requests.
1740 SMB_ASSERT(req2->outbuf != NULL);
1741 outsize2 = smb_len(req2->outbuf)+4;
1744 * Move away the new command output so that caller_output fits in,
1745 * copy in the caller_output saved above.
1748 SMB_ASSERT(outsize_padded >= smb_wct);
1751 * "ofs" is the space we need for caller_output. Equal to
1752 * caller_outputlen plus the padding.
1755 ofs = outsize_padded - smb_wct;
1758 * "to_move" is the amount of bytes the secondary routine gave us
1761 to_move = outsize2 - smb_wct;
1763 if (to_move + ofs + smb_wct + chain_size > max_send) {
1764 smb_panic("replies too large -- would have to cut");
1768 * In the "new" API "outbuf" is allocated via reply_outbuf, just for
1769 * the first request in the chain. So we have to re-allocate it. In
1770 * the "old" API the only outbuf ever used is the global OutBuffer
1771 * which is always large enough.
1774 outbuf = TALLOC_REALLOC_ARRAY(NULL, outbuf, char,
1775 to_move + ofs + smb_wct);
1776 if (outbuf == NULL) {
1777 smb_panic("could not realloc outbuf");
1780 req->outbuf = (uint8 *)outbuf;
1782 memmove(outbuf + smb_wct + ofs, req2->outbuf + smb_wct, to_move);
1783 memcpy(outbuf + smb_wct, caller_output, caller_outputlen);
1786 * copy the new reply header over the old one but preserve the smb_com
1789 memmove(outbuf, req2->outbuf, smb_wct);
1790 SCVAL(outbuf, smb_com, smb_com1);
1793 * We've just copied in the whole "wct" area from the secondary
1794 * function. Fix up the chaining: com2 and the offset need to be
1798 SCVAL(outbuf, smb_vwv0, smb_com2);
1799 SSVAL(outbuf, smb_vwv1, chain_size + smb_wct - 4);
1804 * Due to padding we have some uninitialized bytes after the
1808 memset(outbuf + outsize, 0, padding);
1811 smb_setlen(outbuf, outsize2 + caller_outputlen + padding - 4);
1814 * restore the saved data, being careful not to overwrite any data
1815 * from the reply header
1817 memcpy(inbuf2,inbuf_saved,smb_wct);
1819 SAFE_FREE(caller_output);
1823 * Reset the chain_size for our caller's offset calculations
1826 chain_size -= (outsize_padded - smb_wct);
1831 /****************************************************************************
1832 Check if services need reloading.
1833 ****************************************************************************/
1835 void check_reload(time_t t)
1837 static pid_t mypid = 0;
1838 static time_t last_smb_conf_reload_time = 0;
1839 static time_t last_printer_reload_time = 0;
1840 time_t printcap_cache_time = (time_t)lp_printcap_cache_time();
1842 if(last_smb_conf_reload_time == 0) {
1843 last_smb_conf_reload_time = t;
1844 /* Our printing subsystem might not be ready at smbd start up.
1845 Then no printer is available till the first printers check
1846 is performed. A lower initial interval circumvents this. */
1847 if ( printcap_cache_time > 60 )
1848 last_printer_reload_time = t - printcap_cache_time + 60;
1850 last_printer_reload_time = t;
1853 if (mypid != getpid()) { /* First time or fork happened meanwhile */
1854 /* randomize over 60 second the printcap reload to avoid all
1855 * process hitting cupsd at the same time */
1856 int time_range = 60;
1858 last_printer_reload_time += random() % time_range;
1862 if (reload_after_sighup || (t >= last_smb_conf_reload_time+SMBD_RELOAD_CHECK)) {
1863 reload_services(True);
1864 reload_after_sighup = False;
1865 last_smb_conf_reload_time = t;
1868 /* 'printcap cache time = 0' disable the feature */
1870 if ( printcap_cache_time != 0 )
1872 /* see if it's time to reload or if the clock has been set back */
1874 if ( (t >= last_printer_reload_time+printcap_cache_time)
1875 || (t-last_printer_reload_time < 0) )
1877 DEBUG( 3,( "Printcap cache time expired.\n"));
1879 last_printer_reload_time = t;
1884 /****************************************************************************
1885 Process commands from the client
1886 ****************************************************************************/
1888 void smbd_process(void)
1890 unsigned int num_smbs = 0;
1891 size_t unread_bytes = 0;
1893 char addr[INET6_ADDRSTRLEN];
1896 * Before the first packet, check the global hosts allow/ hosts deny
1897 * parameters before doing any parsing of packets passed to us by the
1898 * client. This prevents attacks on our parsing code from hosts not in
1899 * the hosts allow list.
1902 if (!check_access(smbd_server_fd(), lp_hostsallow(-1),
1903 lp_hostsdeny(-1))) {
1905 * send a negative session response "not listening on calling
1908 unsigned char buf[5] = {0x83, 0, 0, 1, 0x81};
1909 DEBUG( 1, ("Connection denied from %s\n",
1910 client_addr(get_client_fd(),addr,sizeof(addr)) ) );
1911 (void)srv_send_smb(smbd_server_fd(),(char *)buf,false);
1912 exit_server_cleanly("connection denied");
1915 max_recv = MIN(lp_maxxmit(),BUFFER_SIZE);
1920 size_t inbuf_len = 0;
1921 bool encrypted = false;
1922 TALLOC_CTX *frame = talloc_stackframe_pool(8192);
1926 run_events(smbd_event_context(), 0, NULL, NULL);
1928 status = receive_message_or_smb(
1929 talloc_tos(), &inbuf, &inbuf_len,
1930 &unread_bytes, &encrypted);
1932 if (!NT_STATUS_IS_OK(status)) {
1933 DEBUG(3, ("receive_message_or_smb failed: %s, "
1934 "exiting\n", nt_errstr(status)));
1938 process_smb(inbuf, inbuf_len, unread_bytes, encrypted);
1942 /* The timeout_processing function isn't run nearly
1943 often enough to implement 'max log size' without
1944 overrunning the size of the file by many megabytes.
1945 This is especially true if we are running at debug
1946 level 10. Checking every 50 SMBs is a nice
1947 tradeoff of performance vs log file size overrun. */
1949 if ((num_smbs % 50) == 0 && need_to_check_log_size()) {
1950 change_to_root_user();