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/>.
23 extern int smb_echo_count;
26 * Size of data we can send to client. Set
27 * by the client for all protocols above CORE.
28 * Set by us for CORE protocol.
30 int max_send = BUFFER_SIZE;
32 * Size of the data we can receive. Set by us.
33 * Can be modified by the max xmit parameter.
35 int max_recv = BUFFER_SIZE;
37 SIG_ATOMIC_T reload_after_sighup = 0;
38 SIG_ATOMIC_T got_sig_term = 0;
39 extern bool global_machine_password_needs_changing;
42 /* Accessor function for smb_read_error for smbd functions. */
44 /****************************************************************************
46 ****************************************************************************/
48 bool srv_send_smb(int fd, char *buffer, bool do_encrypt)
53 char *buf_out = buffer;
55 /* Sign the outgoing packet if required. */
56 srv_calculate_sign_mac(buf_out);
59 NTSTATUS status = srv_encrypt_buffer(buffer, &buf_out);
60 if (!NT_STATUS_IS_OK(status)) {
61 DEBUG(0, ("send_smb: SMB encryption failed "
62 "on outgoing packet! Error %s\n",
68 len = smb_len(buf_out) + 4;
70 while (nwritten < len) {
71 ret = write_data(fd,buf_out+nwritten,len - nwritten);
73 DEBUG(0,("Error writing %d bytes to client. %d. (%s)\n",
74 (int)len,(int)ret, strerror(errno) ));
75 srv_free_enc_buffer(buf_out);
81 srv_free_enc_buffer(buf_out);
85 /*******************************************************************
86 Setup the word count and byte count for a smb message.
87 ********************************************************************/
89 int srv_set_message(char *buf,
94 if (zero && (num_words || num_bytes)) {
95 memset(buf + smb_size,'\0',num_words*2 + num_bytes);
97 SCVAL(buf,smb_wct,num_words);
98 SSVAL(buf,smb_vwv + num_words*SIZEOFWORD,num_bytes);
99 smb_setlen(buf,(smb_size + num_words*2 + num_bytes - 4));
100 return (smb_size + num_words*2 + num_bytes);
103 static bool valid_smb_header(const uint8_t *inbuf)
105 if (is_encrypted_packet(inbuf)) {
108 return (strncmp(smb_base(inbuf),"\377SMB",4) == 0);
111 /* Socket functions for smbd packet processing. */
113 static bool valid_packet_size(size_t len)
116 * A WRITEX with CAP_LARGE_WRITEX can be 64k worth of data plus 65 bytes
117 * of header. Don't print the error if this fits.... JRA.
120 if (len > (BUFFER_SIZE + LARGE_WRITEX_HDR_SIZE)) {
121 DEBUG(0,("Invalid packet length! (%lu bytes).\n",
122 (unsigned long)len));
128 static NTSTATUS read_packet_remainder(int fd, char *buffer,
129 unsigned int timeout, ssize_t len)
135 return read_socket_with_timeout(fd, buffer, len, len, timeout, NULL);
138 /****************************************************************************
139 Attempt a zerocopy writeX read. We know here that len > smb_size-4
140 ****************************************************************************/
143 * Unfortunately, earlier versions of smbclient/libsmbclient
144 * don't send this "standard" writeX header. I've fixed this
145 * for 3.2 but we'll use the old method with earlier versions.
146 * Windows and CIFSFS at least use this standard size. Not
150 #define STANDARD_WRITE_AND_X_HEADER_SIZE (smb_size - 4 + /* basic header */ \
151 (2*14) + /* word count (including bcc) */ \
154 static NTSTATUS receive_smb_raw_talloc_partial_read(TALLOC_CTX *mem_ctx,
155 const char lenbuf[4],
156 int fd, char **buffer,
157 unsigned int timeout,
161 /* Size of a WRITEX call (+4 byte len). */
162 char writeX_header[4 + STANDARD_WRITE_AND_X_HEADER_SIZE];
163 ssize_t len = smb_len_large(lenbuf); /* Could be a UNIX large writeX. */
167 memcpy(writeX_header, lenbuf, sizeof(lenbuf));
169 status = read_socket_with_timeout(
170 fd, writeX_header + 4,
171 STANDARD_WRITE_AND_X_HEADER_SIZE,
172 STANDARD_WRITE_AND_X_HEADER_SIZE,
175 if (!NT_STATUS_IS_OK(status)) {
180 * Ok - now try and see if this is a possible
184 if (is_valid_writeX_buffer((uint8_t *)writeX_header)) {
186 * If the data offset is beyond what
187 * we've read, drain the extra bytes.
189 uint16_t doff = SVAL(writeX_header,smb_vwv11);
192 if (doff > STANDARD_WRITE_AND_X_HEADER_SIZE) {
193 size_t drain = doff - STANDARD_WRITE_AND_X_HEADER_SIZE;
194 if (drain_socket(smbd_server_fd(), drain) != drain) {
195 smb_panic("receive_smb_raw_talloc_partial_read:"
196 " failed to drain pending bytes");
199 doff = STANDARD_WRITE_AND_X_HEADER_SIZE;
202 /* Spoof down the length and null out the bcc. */
203 set_message_bcc(writeX_header, 0);
204 newlen = smb_len(writeX_header);
206 /* Copy the header we've written. */
208 *buffer = (char *)TALLOC_MEMDUP(mem_ctx,
210 sizeof(writeX_header));
212 if (*buffer == NULL) {
213 DEBUG(0, ("Could not allocate inbuf of length %d\n",
214 (int)sizeof(writeX_header)));
215 return NT_STATUS_NO_MEMORY;
218 /* Work out the remaining bytes. */
219 *p_unread = len - STANDARD_WRITE_AND_X_HEADER_SIZE;
220 *len_ret = newlen + 4;
224 if (!valid_packet_size(len)) {
225 return NT_STATUS_INVALID_PARAMETER;
229 * Not a valid writeX call. Just do the standard
233 *buffer = TALLOC_ARRAY(mem_ctx, char, len+4);
235 if (*buffer == NULL) {
236 DEBUG(0, ("Could not allocate inbuf of length %d\n",
238 return NT_STATUS_NO_MEMORY;
241 /* Copy in what we already read. */
244 4 + STANDARD_WRITE_AND_X_HEADER_SIZE);
245 toread = len - STANDARD_WRITE_AND_X_HEADER_SIZE;
248 status = read_packet_remainder(
249 fd, (*buffer) + 4 + STANDARD_WRITE_AND_X_HEADER_SIZE,
252 if (!NT_STATUS_IS_OK(status)) {
253 DEBUG(10, ("receive_smb_raw_talloc_partial_read: %s\n",
263 static NTSTATUS receive_smb_raw_talloc(TALLOC_CTX *mem_ctx, int fd,
264 char **buffer, unsigned int timeout,
265 size_t *p_unread, size_t *plen)
269 int min_recv_size = lp_min_receive_file_size();
274 status = read_smb_length_return_keepalive(fd, lenbuf, timeout, &len);
275 if (!NT_STATUS_IS_OK(status)) {
276 DEBUG(10, ("receive_smb_raw: %s\n", nt_errstr(status)));
280 if (CVAL(lenbuf,0) == 0 &&
282 smb_len_large(lenbuf) > min_recv_size && /* Could be a UNIX large writeX. */
283 !srv_is_signing_active()) {
285 return receive_smb_raw_talloc_partial_read(
286 mem_ctx, lenbuf, fd, buffer, timeout, p_unread, plen);
289 if (!valid_packet_size(len)) {
290 return NT_STATUS_INVALID_PARAMETER;
294 * The +4 here can't wrap, we've checked the length above already.
297 *buffer = TALLOC_ARRAY(mem_ctx, char, len+4);
299 if (*buffer == NULL) {
300 DEBUG(0, ("Could not allocate inbuf of length %d\n",
302 return NT_STATUS_NO_MEMORY;
305 memcpy(*buffer, lenbuf, sizeof(lenbuf));
307 status = read_packet_remainder(fd, (*buffer)+4, timeout, len);
308 if (!NT_STATUS_IS_OK(status)) {
316 static NTSTATUS receive_smb_talloc(TALLOC_CTX *mem_ctx, int fd,
317 char **buffer, unsigned int timeout,
318 size_t *p_unread, bool *p_encrypted,
324 *p_encrypted = false;
326 status = receive_smb_raw_talloc(mem_ctx, fd, buffer, timeout,
328 if (!NT_STATUS_IS_OK(status)) {
332 if (is_encrypted_packet((uint8_t *)*buffer)) {
333 status = srv_decrypt_buffer(*buffer);
334 if (!NT_STATUS_IS_OK(status)) {
335 DEBUG(0, ("receive_smb_talloc: SMB decryption failed on "
336 "incoming packet! Error %s\n",
337 nt_errstr(status) ));
343 /* Check the incoming SMB signature. */
344 if (!srv_check_sign_mac(*buffer, true)) {
345 DEBUG(0, ("receive_smb: SMB Signature verification failed on "
346 "incoming packet!\n"));
347 return NT_STATUS_INVALID_NETWORK_RESPONSE;
355 * Initialize a struct smb_request from an inbuf
358 void init_smb_request(struct smb_request *req,
363 size_t req_size = smb_len(inbuf) + 4;
364 /* Ensure we have at least smb_size bytes. */
365 if (req_size < smb_size) {
366 DEBUG(0,("init_smb_request: invalid request size %u\n",
367 (unsigned int)req_size ));
368 exit_server_cleanly("Invalid SMB request");
370 req->flags2 = SVAL(inbuf, smb_flg2);
371 req->smbpid = SVAL(inbuf, smb_pid);
372 req->mid = SVAL(inbuf, smb_mid);
373 req->vuid = SVAL(inbuf, smb_uid);
374 req->tid = SVAL(inbuf, smb_tid);
375 req->wct = CVAL(inbuf, smb_wct);
376 req->unread_bytes = unread_bytes;
377 req->encrypted = encrypted;
378 req->conn = conn_find(req->tid);
380 /* Ensure we have at least wct words and 2 bytes of bcc. */
381 if (smb_size + req->wct*2 > req_size) {
382 DEBUG(0,("init_smb_request: invalid wct number %u (size %u)\n",
383 (unsigned int)req->wct,
384 (unsigned int)req_size));
385 exit_server_cleanly("Invalid SMB request");
387 /* Ensure bcc is correct. */
388 if (((uint8 *)smb_buf(inbuf)) + smb_buflen(inbuf) > inbuf + req_size) {
389 DEBUG(0,("init_smb_request: invalid bcc number %u "
390 "(wct = %u, size %u)\n",
391 (unsigned int)smb_buflen(inbuf),
392 (unsigned int)req->wct,
393 (unsigned int)req_size));
394 exit_server_cleanly("Invalid SMB request");
400 /****************************************************************************
401 structure to hold a linked list of queued messages.
403 ****************************************************************************/
405 static struct pending_message_list *deferred_open_queue;
407 /****************************************************************************
408 Function to push a message onto the tail of a linked list of smb messages ready
410 ****************************************************************************/
412 static bool push_queued_message(struct smb_request *req,
413 struct timeval request_time,
414 struct timeval end_time,
415 char *private_data, size_t private_len)
417 int msg_len = smb_len(req->inbuf) + 4;
418 struct pending_message_list *msg;
420 msg = TALLOC_ZERO_P(NULL, struct pending_message_list);
423 DEBUG(0,("push_message: malloc fail (1)\n"));
427 msg->buf = data_blob_talloc(msg, req->inbuf, msg_len);
428 if(msg->buf.data == NULL) {
429 DEBUG(0,("push_message: malloc fail (2)\n"));
434 msg->request_time = request_time;
435 msg->end_time = end_time;
436 msg->encrypted = req->encrypted;
439 msg->private_data = data_blob_talloc(msg, private_data,
441 if (msg->private_data.data == NULL) {
442 DEBUG(0,("push_message: malloc fail (3)\n"));
448 DLIST_ADD_END(deferred_open_queue, msg, struct pending_message_list *);
450 DEBUG(10,("push_message: pushed message length %u on "
451 "deferred_open_queue\n", (unsigned int)msg_len));
456 /****************************************************************************
457 Function to delete a sharing violation open message by mid.
458 ****************************************************************************/
460 void remove_deferred_open_smb_message(uint16 mid)
462 struct pending_message_list *pml;
464 for (pml = deferred_open_queue; pml; pml = pml->next) {
465 if (mid == SVAL(pml->buf.data,smb_mid)) {
466 DEBUG(10,("remove_sharing_violation_open_smb_message: "
467 "deleting mid %u len %u\n",
469 (unsigned int)pml->buf.length ));
470 DLIST_REMOVE(deferred_open_queue, pml);
477 /****************************************************************************
478 Move a sharing violation open retry message to the front of the list and
479 schedule it for immediate processing.
480 ****************************************************************************/
482 void schedule_deferred_open_smb_message(uint16 mid)
484 struct pending_message_list *pml;
487 for (pml = deferred_open_queue; pml; pml = pml->next) {
488 uint16 msg_mid = SVAL(pml->buf.data,smb_mid);
489 DEBUG(10,("schedule_deferred_open_smb_message: [%d] msg_mid = %u\n", i++,
490 (unsigned int)msg_mid ));
491 if (mid == msg_mid) {
492 DEBUG(10,("schedule_deferred_open_smb_message: scheduling mid %u\n",
494 pml->end_time.tv_sec = 0;
495 pml->end_time.tv_usec = 0;
496 DLIST_PROMOTE(deferred_open_queue, pml);
501 DEBUG(10,("schedule_deferred_open_smb_message: failed to find message mid %u\n",
505 /****************************************************************************
506 Return true if this mid is on the deferred queue.
507 ****************************************************************************/
509 bool open_was_deferred(uint16 mid)
511 struct pending_message_list *pml;
513 for (pml = deferred_open_queue; pml; pml = pml->next) {
514 if (SVAL(pml->buf.data,smb_mid) == mid) {
521 /****************************************************************************
522 Return the message queued by this mid.
523 ****************************************************************************/
525 struct pending_message_list *get_open_deferred_message(uint16 mid)
527 struct pending_message_list *pml;
529 for (pml = deferred_open_queue; pml; pml = pml->next) {
530 if (SVAL(pml->buf.data,smb_mid) == mid) {
537 /****************************************************************************
538 Function to push a deferred open smb message onto a linked list of local smb
539 messages ready for processing.
540 ****************************************************************************/
542 bool push_deferred_smb_message(struct smb_request *req,
543 struct timeval request_time,
544 struct timeval timeout,
545 char *private_data, size_t priv_len)
547 struct timeval end_time;
549 if (req->unread_bytes) {
550 DEBUG(0,("push_deferred_smb_message: logic error ! "
551 "unread_bytes = %u\n",
552 (unsigned int)req->unread_bytes ));
553 smb_panic("push_deferred_smb_message: "
554 "logic error unread_bytes != 0" );
557 end_time = timeval_sum(&request_time, &timeout);
559 DEBUG(10,("push_deferred_open_smb_message: pushing message len %u mid %u "
560 "timeout time [%u.%06u]\n",
561 (unsigned int) smb_len(req->inbuf)+4, (unsigned int)req->mid,
562 (unsigned int)end_time.tv_sec,
563 (unsigned int)end_time.tv_usec));
565 return push_queued_message(req, request_time, end_time,
566 private_data, priv_len);
570 struct timed_event *te;
571 struct timeval interval;
573 bool (*handler)(const struct timeval *now, void *private_data);
577 static void idle_event_handler(struct event_context *ctx,
578 struct timed_event *te,
579 const struct timeval *now,
582 struct idle_event *event =
583 talloc_get_type_abort(private_data, struct idle_event);
585 TALLOC_FREE(event->te);
587 if (!event->handler(now, event->private_data)) {
588 /* Don't repeat, delete ourselves */
593 event->te = event_add_timed(ctx, event,
594 timeval_sum(now, &event->interval),
596 idle_event_handler, event);
598 /* We can't do much but fail here. */
599 SMB_ASSERT(event->te != NULL);
602 struct idle_event *event_add_idle(struct event_context *event_ctx,
604 struct timeval interval,
606 bool (*handler)(const struct timeval *now,
610 struct idle_event *result;
611 struct timeval now = timeval_current();
613 result = TALLOC_P(mem_ctx, struct idle_event);
614 if (result == NULL) {
615 DEBUG(0, ("talloc failed\n"));
619 result->interval = interval;
620 result->handler = handler;
621 result->private_data = private_data;
623 if (!(result->name = talloc_asprintf(result, "idle_evt(%s)", name))) {
624 DEBUG(0, ("talloc failed\n"));
629 result->te = event_add_timed(event_ctx, result,
630 timeval_sum(&now, &interval),
632 idle_event_handler, result);
633 if (result->te == NULL) {
634 DEBUG(0, ("event_add_timed failed\n"));
642 /****************************************************************************
643 Do all async processing in here. This includes kernel oplock messages, change
645 ****************************************************************************/
647 static void async_processing(fd_set *pfds)
649 DEBUG(10,("async_processing: Doing async processing.\n"));
653 process_kernel_oplocks(smbd_messaging_context(), pfds);
655 /* Do the aio check again after receive_local_message as it does a
656 select and may have eaten our signal. */
657 /* Is this till true? -- vl */
661 exit_server_cleanly("termination signal");
664 /* check for sighup processing */
665 if (reload_after_sighup) {
666 change_to_root_user();
667 DEBUG(1,("Reloading services after SIGHUP\n"));
668 reload_services(False);
669 reload_after_sighup = 0;
673 /****************************************************************************
674 Add a fd to the set we will be select(2)ing on.
675 ****************************************************************************/
677 static int select_on_fd(int fd, int maxfd, fd_set *fds)
681 maxfd = MAX(maxfd, fd);
687 /****************************************************************************
688 Do a select on an two fd's - with timeout.
690 If a local udp message has been pushed onto the
691 queue (this can only happen during oplock break
692 processing) call async_processing()
694 If a pending smb message has been pushed onto the
695 queue (this can only happen during oplock break
696 processing) return this next.
698 If the first smbfd is ready then read an smb from it.
699 if the second (loopback UDP) fd is ready then read a message
700 from it and setup the buffer header to identify the length
702 Returns False on timeout or error.
705 The timeout is in milliseconds
706 ****************************************************************************/
708 static NTSTATUS receive_message_or_smb(TALLOC_CTX *mem_ctx, char **buffer,
709 size_t *buffer_len, int timeout,
710 size_t *p_unread, bool *p_encrypted)
724 to.tv_sec = timeout / 1000;
725 to.tv_usec = (timeout % 1000) * 1000;
727 to.tv_sec = SMBD_SELECT_TIMEOUT;
732 * Note that this call must be before processing any SMB
733 * messages as we need to synchronously process any messages
734 * we may have sent to ourselves from the previous SMB.
736 message_dispatch(smbd_messaging_context());
739 * Check to see if we already have a message on the deferred open queue
740 * and it's time to schedule.
742 if(deferred_open_queue != NULL) {
743 bool pop_message = False;
744 struct pending_message_list *msg = deferred_open_queue;
746 if (timeval_is_zero(&msg->end_time)) {
753 tdif = usec_time_diff(&msg->end_time, &tv);
755 /* Timed out. Schedule...*/
757 DEBUG(10,("receive_message_or_smb: queued message timed out.\n"));
759 /* Make a more accurate select timeout. */
760 to.tv_sec = tdif / 1000000;
761 to.tv_usec = tdif % 1000000;
762 DEBUG(10,("receive_message_or_smb: select with timeout of [%u.%06u]\n",
763 (unsigned int)to.tv_sec, (unsigned int)to.tv_usec ));
769 *buffer = (char *)talloc_memdup(mem_ctx, msg->buf.data,
771 if (*buffer == NULL) {
772 DEBUG(0, ("talloc failed\n"));
773 return NT_STATUS_NO_MEMORY;
775 *buffer_len = msg->buf.length;
776 *p_encrypted = msg->encrypted;
778 /* We leave this message on the queue so the open code can
779 know this is a retry. */
780 DEBUG(5,("receive_message_or_smb: returning deferred open smb message.\n"));
786 * Setup the select fd sets.
793 * Ensure we process oplock break messages by preference.
794 * We have to do this before the select, after the select
795 * and if the select returns EINTR. This is due to the fact
796 * that the selects called from async_processing can eat an EINTR
797 * caused by a signal (we can't take the break message there).
798 * This is hideously complex - *MUST* be simplified for 3.0 ! JRA.
801 if (oplock_message_waiting(&r_fds)) {
802 DEBUG(10,("receive_message_or_smb: oplock_message is waiting.\n"));
803 async_processing(&r_fds);
805 * After async processing we must go and do the select again, as
806 * the state of the flag in fds for the server file descriptor is
807 * indeterminate - we may have done I/O on it in the oplock processing. JRA.
813 * Are there any timed events waiting ? If so, ensure we don't
814 * select for longer than it would take to wait for them.
821 event_add_to_select_args(smbd_event_context(), &now,
822 &r_fds, &w_fds, &to, &maxfd);
825 if (timeval_is_zero(&to)) {
826 /* Process a timed event now... */
827 if (run_events(smbd_event_context(), 0, NULL, NULL)) {
834 START_PROFILE(smbd_idle);
836 maxfd = select_on_fd(smbd_server_fd(), maxfd, &r_fds);
837 maxfd = select_on_fd(oplock_notify_fd(), maxfd, &r_fds);
839 selrtn = sys_select(maxfd+1,&r_fds,&w_fds,NULL,&to);
842 END_PROFILE(smbd_idle);
846 if (run_events(smbd_event_context(), selrtn, &r_fds, &w_fds)) {
850 /* if we get EINTR then maybe we have received an oplock
851 signal - treat this as select returning 1. This is ugly, but
852 is the best we can do until the oplock code knows more about
854 if (selrtn == -1 && errno == EINTR) {
855 async_processing(&r_fds);
857 * After async processing we must go and do the select again, as
858 * the state of the flag in fds for the server file descriptor is
859 * indeterminate - we may have done I/O on it in the oplock processing. JRA.
866 /* something is wrong. Maybe the socket is dead? */
867 return map_nt_error_from_unix(errno);
870 /* Did we timeout ? */
872 return NT_STATUS_IO_TIMEOUT;
876 * Ensure we process oplock break messages by preference.
877 * This is IMPORTANT ! Otherwise we can starve other processes
878 * sending us an oplock break message. JRA.
881 if (oplock_message_waiting(&r_fds)) {
882 async_processing(&r_fds);
884 * After async processing we must go and do the select again, as
885 * the state of the flag in fds for the server file descriptor is
886 * indeterminate - we may have done I/O on it in the oplock processing. JRA.
892 * We've just woken up from a protentially long select sleep.
893 * Ensure we process local messages as we need to synchronously
894 * process any messages from other smbd's to avoid file rename race
895 * conditions. This call is cheap if there are no messages waiting.
898 message_dispatch(smbd_messaging_context());
900 status = receive_smb_talloc(mem_ctx, smbd_server_fd(), buffer, 0,
901 p_unread, p_encrypted, &len);
903 if (!NT_STATUS_IS_OK(status)) {
913 * Only allow 5 outstanding trans requests. We're allocating memory, so
917 NTSTATUS allow_new_trans(struct trans_state *list, int mid)
920 for (; list != NULL; list = list->next) {
922 if (list->mid == mid) {
923 return NT_STATUS_INVALID_PARAMETER;
929 return NT_STATUS_INSUFFICIENT_RESOURCES;
935 /****************************************************************************
936 We're terminating and have closed all our files/connections etc.
937 If there are any pending local messages we need to respond to them
938 before termination so that other smbds don't think we just died whilst
940 ****************************************************************************/
942 void respond_to_all_remaining_local_messages(void)
945 * Assert we have no exclusive open oplocks.
948 if(get_number_of_exclusive_open_oplocks()) {
949 DEBUG(0,("respond_to_all_remaining_local_messages: PANIC : we have %d exclusive oplocks.\n",
950 get_number_of_exclusive_open_oplocks() ));
954 process_kernel_oplocks(smbd_messaging_context(), NULL);
961 These flags determine some of the permissions required to do an operation
963 Note that I don't set NEED_WRITE on some write operations because they
964 are used by some brain-dead clients when printing, and I don't want to
965 force write permissions on print services.
967 #define AS_USER (1<<0)
968 #define NEED_WRITE (1<<1) /* Must be paired with AS_USER */
969 #define TIME_INIT (1<<2)
970 #define CAN_IPC (1<<3) /* Must be paired with AS_USER */
971 #define AS_GUEST (1<<5) /* Must *NOT* be paired with AS_USER */
972 #define DO_CHDIR (1<<6)
975 define a list of possible SMB messages and their corresponding
976 functions. Any message that has a NULL function is unimplemented -
977 please feel free to contribute implementations!
979 static const struct smb_message_struct {
981 void (*fn_new)(struct smb_request *req);
983 } smb_messages[256] = {
985 /* 0x00 */ { "SMBmkdir",reply_mkdir,AS_USER | NEED_WRITE},
986 /* 0x01 */ { "SMBrmdir",reply_rmdir,AS_USER | NEED_WRITE},
987 /* 0x02 */ { "SMBopen",reply_open,AS_USER },
988 /* 0x03 */ { "SMBcreate",reply_mknew,AS_USER},
989 /* 0x04 */ { "SMBclose",reply_close,AS_USER | CAN_IPC },
990 /* 0x05 */ { "SMBflush",reply_flush,AS_USER},
991 /* 0x06 */ { "SMBunlink",reply_unlink,AS_USER | NEED_WRITE },
992 /* 0x07 */ { "SMBmv",reply_mv,AS_USER | NEED_WRITE },
993 /* 0x08 */ { "SMBgetatr",reply_getatr,AS_USER},
994 /* 0x09 */ { "SMBsetatr",reply_setatr,AS_USER | NEED_WRITE},
995 /* 0x0a */ { "SMBread",reply_read,AS_USER},
996 /* 0x0b */ { "SMBwrite",reply_write,AS_USER | CAN_IPC },
997 /* 0x0c */ { "SMBlock",reply_lock,AS_USER},
998 /* 0x0d */ { "SMBunlock",reply_unlock,AS_USER},
999 /* 0x0e */ { "SMBctemp",reply_ctemp,AS_USER },
1000 /* 0x0f */ { "SMBmknew",reply_mknew,AS_USER},
1001 /* 0x10 */ { "SMBcheckpath",reply_checkpath,AS_USER},
1002 /* 0x11 */ { "SMBexit",reply_exit,DO_CHDIR},
1003 /* 0x12 */ { "SMBlseek",reply_lseek,AS_USER},
1004 /* 0x13 */ { "SMBlockread",reply_lockread,AS_USER},
1005 /* 0x14 */ { "SMBwriteunlock",reply_writeunlock,AS_USER},
1006 /* 0x15 */ { NULL, NULL, 0 },
1007 /* 0x16 */ { NULL, NULL, 0 },
1008 /* 0x17 */ { NULL, NULL, 0 },
1009 /* 0x18 */ { NULL, NULL, 0 },
1010 /* 0x19 */ { NULL, NULL, 0 },
1011 /* 0x1a */ { "SMBreadbraw",reply_readbraw,AS_USER},
1012 /* 0x1b */ { "SMBreadBmpx",reply_readbmpx,AS_USER},
1013 /* 0x1c */ { "SMBreadBs",reply_readbs,AS_USER },
1014 /* 0x1d */ { "SMBwritebraw",reply_writebraw,AS_USER},
1015 /* 0x1e */ { "SMBwriteBmpx",reply_writebmpx,AS_USER},
1016 /* 0x1f */ { "SMBwriteBs",reply_writebs,AS_USER},
1017 /* 0x20 */ { "SMBwritec", NULL,0},
1018 /* 0x21 */ { NULL, NULL, 0 },
1019 /* 0x22 */ { "SMBsetattrE",reply_setattrE,AS_USER | NEED_WRITE },
1020 /* 0x23 */ { "SMBgetattrE",reply_getattrE,AS_USER },
1021 /* 0x24 */ { "SMBlockingX",reply_lockingX,AS_USER },
1022 /* 0x25 */ { "SMBtrans",reply_trans,AS_USER | CAN_IPC },
1023 /* 0x26 */ { "SMBtranss",reply_transs,AS_USER | CAN_IPC},
1024 /* 0x27 */ { "SMBioctl",reply_ioctl,0},
1025 /* 0x28 */ { "SMBioctls", NULL,AS_USER},
1026 /* 0x29 */ { "SMBcopy",reply_copy,AS_USER | NEED_WRITE },
1027 /* 0x2a */ { "SMBmove", NULL,AS_USER | NEED_WRITE },
1028 /* 0x2b */ { "SMBecho",reply_echo,0},
1029 /* 0x2c */ { "SMBwriteclose",reply_writeclose,AS_USER},
1030 /* 0x2d */ { "SMBopenX",reply_open_and_X,AS_USER | CAN_IPC },
1031 /* 0x2e */ { "SMBreadX",reply_read_and_X,AS_USER | CAN_IPC },
1032 /* 0x2f */ { "SMBwriteX",reply_write_and_X,AS_USER | CAN_IPC },
1033 /* 0x30 */ { NULL, NULL, 0 },
1034 /* 0x31 */ { NULL, NULL, 0 },
1035 /* 0x32 */ { "SMBtrans2",reply_trans2, AS_USER | CAN_IPC },
1036 /* 0x33 */ { "SMBtranss2",reply_transs2, AS_USER},
1037 /* 0x34 */ { "SMBfindclose",reply_findclose,AS_USER},
1038 /* 0x35 */ { "SMBfindnclose",reply_findnclose,AS_USER},
1039 /* 0x36 */ { NULL, NULL, 0 },
1040 /* 0x37 */ { NULL, NULL, 0 },
1041 /* 0x38 */ { NULL, NULL, 0 },
1042 /* 0x39 */ { NULL, NULL, 0 },
1043 /* 0x3a */ { NULL, NULL, 0 },
1044 /* 0x3b */ { NULL, NULL, 0 },
1045 /* 0x3c */ { NULL, NULL, 0 },
1046 /* 0x3d */ { NULL, NULL, 0 },
1047 /* 0x3e */ { NULL, NULL, 0 },
1048 /* 0x3f */ { NULL, NULL, 0 },
1049 /* 0x40 */ { NULL, NULL, 0 },
1050 /* 0x41 */ { NULL, NULL, 0 },
1051 /* 0x42 */ { NULL, NULL, 0 },
1052 /* 0x43 */ { NULL, NULL, 0 },
1053 /* 0x44 */ { NULL, NULL, 0 },
1054 /* 0x45 */ { NULL, NULL, 0 },
1055 /* 0x46 */ { NULL, NULL, 0 },
1056 /* 0x47 */ { NULL, NULL, 0 },
1057 /* 0x48 */ { NULL, NULL, 0 },
1058 /* 0x49 */ { NULL, NULL, 0 },
1059 /* 0x4a */ { NULL, NULL, 0 },
1060 /* 0x4b */ { NULL, NULL, 0 },
1061 /* 0x4c */ { NULL, NULL, 0 },
1062 /* 0x4d */ { NULL, NULL, 0 },
1063 /* 0x4e */ { NULL, NULL, 0 },
1064 /* 0x4f */ { NULL, NULL, 0 },
1065 /* 0x50 */ { NULL, NULL, 0 },
1066 /* 0x51 */ { NULL, NULL, 0 },
1067 /* 0x52 */ { NULL, NULL, 0 },
1068 /* 0x53 */ { NULL, NULL, 0 },
1069 /* 0x54 */ { NULL, NULL, 0 },
1070 /* 0x55 */ { NULL, NULL, 0 },
1071 /* 0x56 */ { NULL, NULL, 0 },
1072 /* 0x57 */ { NULL, NULL, 0 },
1073 /* 0x58 */ { NULL, NULL, 0 },
1074 /* 0x59 */ { NULL, NULL, 0 },
1075 /* 0x5a */ { NULL, NULL, 0 },
1076 /* 0x5b */ { NULL, NULL, 0 },
1077 /* 0x5c */ { NULL, NULL, 0 },
1078 /* 0x5d */ { NULL, NULL, 0 },
1079 /* 0x5e */ { NULL, NULL, 0 },
1080 /* 0x5f */ { NULL, NULL, 0 },
1081 /* 0x60 */ { NULL, NULL, 0 },
1082 /* 0x61 */ { NULL, NULL, 0 },
1083 /* 0x62 */ { NULL, NULL, 0 },
1084 /* 0x63 */ { NULL, NULL, 0 },
1085 /* 0x64 */ { NULL, NULL, 0 },
1086 /* 0x65 */ { NULL, NULL, 0 },
1087 /* 0x66 */ { NULL, NULL, 0 },
1088 /* 0x67 */ { NULL, NULL, 0 },
1089 /* 0x68 */ { NULL, NULL, 0 },
1090 /* 0x69 */ { NULL, NULL, 0 },
1091 /* 0x6a */ { NULL, NULL, 0 },
1092 /* 0x6b */ { NULL, NULL, 0 },
1093 /* 0x6c */ { NULL, NULL, 0 },
1094 /* 0x6d */ { NULL, NULL, 0 },
1095 /* 0x6e */ { NULL, NULL, 0 },
1096 /* 0x6f */ { NULL, NULL, 0 },
1097 /* 0x70 */ { "SMBtcon",reply_tcon,0},
1098 /* 0x71 */ { "SMBtdis",reply_tdis,DO_CHDIR},
1099 /* 0x72 */ { "SMBnegprot",reply_negprot,0},
1100 /* 0x73 */ { "SMBsesssetupX",reply_sesssetup_and_X,0},
1101 /* 0x74 */ { "SMBulogoffX",reply_ulogoffX, 0}, /* ulogoff doesn't give a valid TID */
1102 /* 0x75 */ { "SMBtconX",reply_tcon_and_X,0},
1103 /* 0x76 */ { NULL, NULL, 0 },
1104 /* 0x77 */ { NULL, NULL, 0 },
1105 /* 0x78 */ { NULL, NULL, 0 },
1106 /* 0x79 */ { NULL, NULL, 0 },
1107 /* 0x7a */ { NULL, NULL, 0 },
1108 /* 0x7b */ { NULL, NULL, 0 },
1109 /* 0x7c */ { NULL, NULL, 0 },
1110 /* 0x7d */ { NULL, NULL, 0 },
1111 /* 0x7e */ { NULL, NULL, 0 },
1112 /* 0x7f */ { NULL, NULL, 0 },
1113 /* 0x80 */ { "SMBdskattr",reply_dskattr,AS_USER},
1114 /* 0x81 */ { "SMBsearch",reply_search,AS_USER},
1115 /* 0x82 */ { "SMBffirst",reply_search,AS_USER},
1116 /* 0x83 */ { "SMBfunique",reply_search,AS_USER},
1117 /* 0x84 */ { "SMBfclose",reply_fclose,AS_USER},
1118 /* 0x85 */ { NULL, NULL, 0 },
1119 /* 0x86 */ { NULL, NULL, 0 },
1120 /* 0x87 */ { NULL, NULL, 0 },
1121 /* 0x88 */ { NULL, NULL, 0 },
1122 /* 0x89 */ { NULL, NULL, 0 },
1123 /* 0x8a */ { NULL, NULL, 0 },
1124 /* 0x8b */ { NULL, NULL, 0 },
1125 /* 0x8c */ { NULL, NULL, 0 },
1126 /* 0x8d */ { NULL, NULL, 0 },
1127 /* 0x8e */ { NULL, NULL, 0 },
1128 /* 0x8f */ { NULL, NULL, 0 },
1129 /* 0x90 */ { NULL, NULL, 0 },
1130 /* 0x91 */ { NULL, NULL, 0 },
1131 /* 0x92 */ { NULL, NULL, 0 },
1132 /* 0x93 */ { NULL, NULL, 0 },
1133 /* 0x94 */ { NULL, NULL, 0 },
1134 /* 0x95 */ { NULL, NULL, 0 },
1135 /* 0x96 */ { NULL, NULL, 0 },
1136 /* 0x97 */ { NULL, NULL, 0 },
1137 /* 0x98 */ { NULL, NULL, 0 },
1138 /* 0x99 */ { NULL, NULL, 0 },
1139 /* 0x9a */ { NULL, NULL, 0 },
1140 /* 0x9b */ { NULL, NULL, 0 },
1141 /* 0x9c */ { NULL, NULL, 0 },
1142 /* 0x9d */ { NULL, NULL, 0 },
1143 /* 0x9e */ { NULL, NULL, 0 },
1144 /* 0x9f */ { NULL, NULL, 0 },
1145 /* 0xa0 */ { "SMBnttrans",reply_nttrans, AS_USER | CAN_IPC },
1146 /* 0xa1 */ { "SMBnttranss",reply_nttranss, AS_USER | CAN_IPC },
1147 /* 0xa2 */ { "SMBntcreateX",reply_ntcreate_and_X, AS_USER | CAN_IPC },
1148 /* 0xa3 */ { NULL, NULL, 0 },
1149 /* 0xa4 */ { "SMBntcancel",reply_ntcancel, 0 },
1150 /* 0xa5 */ { "SMBntrename",reply_ntrename, AS_USER | NEED_WRITE },
1151 /* 0xa6 */ { NULL, NULL, 0 },
1152 /* 0xa7 */ { NULL, NULL, 0 },
1153 /* 0xa8 */ { NULL, NULL, 0 },
1154 /* 0xa9 */ { NULL, NULL, 0 },
1155 /* 0xaa */ { NULL, NULL, 0 },
1156 /* 0xab */ { NULL, NULL, 0 },
1157 /* 0xac */ { NULL, NULL, 0 },
1158 /* 0xad */ { NULL, NULL, 0 },
1159 /* 0xae */ { NULL, NULL, 0 },
1160 /* 0xaf */ { NULL, NULL, 0 },
1161 /* 0xb0 */ { NULL, NULL, 0 },
1162 /* 0xb1 */ { NULL, NULL, 0 },
1163 /* 0xb2 */ { NULL, NULL, 0 },
1164 /* 0xb3 */ { NULL, NULL, 0 },
1165 /* 0xb4 */ { NULL, NULL, 0 },
1166 /* 0xb5 */ { NULL, NULL, 0 },
1167 /* 0xb6 */ { NULL, NULL, 0 },
1168 /* 0xb7 */ { NULL, NULL, 0 },
1169 /* 0xb8 */ { NULL, NULL, 0 },
1170 /* 0xb9 */ { NULL, NULL, 0 },
1171 /* 0xba */ { NULL, NULL, 0 },
1172 /* 0xbb */ { NULL, NULL, 0 },
1173 /* 0xbc */ { NULL, NULL, 0 },
1174 /* 0xbd */ { NULL, NULL, 0 },
1175 /* 0xbe */ { NULL, NULL, 0 },
1176 /* 0xbf */ { NULL, NULL, 0 },
1177 /* 0xc0 */ { "SMBsplopen",reply_printopen,AS_USER},
1178 /* 0xc1 */ { "SMBsplwr",reply_printwrite,AS_USER},
1179 /* 0xc2 */ { "SMBsplclose",reply_printclose,AS_USER},
1180 /* 0xc3 */ { "SMBsplretq",reply_printqueue,AS_USER},
1181 /* 0xc4 */ { NULL, NULL, 0 },
1182 /* 0xc5 */ { NULL, NULL, 0 },
1183 /* 0xc6 */ { NULL, NULL, 0 },
1184 /* 0xc7 */ { NULL, NULL, 0 },
1185 /* 0xc8 */ { NULL, NULL, 0 },
1186 /* 0xc9 */ { NULL, NULL, 0 },
1187 /* 0xca */ { NULL, NULL, 0 },
1188 /* 0xcb */ { NULL, NULL, 0 },
1189 /* 0xcc */ { NULL, NULL, 0 },
1190 /* 0xcd */ { NULL, NULL, 0 },
1191 /* 0xce */ { NULL, NULL, 0 },
1192 /* 0xcf */ { NULL, NULL, 0 },
1193 /* 0xd0 */ { "SMBsends",reply_sends,AS_GUEST},
1194 /* 0xd1 */ { "SMBsendb", NULL,AS_GUEST},
1195 /* 0xd2 */ { "SMBfwdname", NULL,AS_GUEST},
1196 /* 0xd3 */ { "SMBcancelf", NULL,AS_GUEST},
1197 /* 0xd4 */ { "SMBgetmac", NULL,AS_GUEST},
1198 /* 0xd5 */ { "SMBsendstrt",reply_sendstrt,AS_GUEST},
1199 /* 0xd6 */ { "SMBsendend",reply_sendend,AS_GUEST},
1200 /* 0xd7 */ { "SMBsendtxt",reply_sendtxt,AS_GUEST},
1201 /* 0xd8 */ { NULL, NULL, 0 },
1202 /* 0xd9 */ { NULL, NULL, 0 },
1203 /* 0xda */ { NULL, NULL, 0 },
1204 /* 0xdb */ { NULL, NULL, 0 },
1205 /* 0xdc */ { NULL, NULL, 0 },
1206 /* 0xdd */ { NULL, NULL, 0 },
1207 /* 0xde */ { NULL, NULL, 0 },
1208 /* 0xdf */ { NULL, NULL, 0 },
1209 /* 0xe0 */ { NULL, NULL, 0 },
1210 /* 0xe1 */ { NULL, NULL, 0 },
1211 /* 0xe2 */ { NULL, NULL, 0 },
1212 /* 0xe3 */ { NULL, NULL, 0 },
1213 /* 0xe4 */ { NULL, NULL, 0 },
1214 /* 0xe5 */ { NULL, NULL, 0 },
1215 /* 0xe6 */ { NULL, NULL, 0 },
1216 /* 0xe7 */ { NULL, NULL, 0 },
1217 /* 0xe8 */ { NULL, NULL, 0 },
1218 /* 0xe9 */ { NULL, NULL, 0 },
1219 /* 0xea */ { NULL, NULL, 0 },
1220 /* 0xeb */ { NULL, NULL, 0 },
1221 /* 0xec */ { NULL, NULL, 0 },
1222 /* 0xed */ { NULL, NULL, 0 },
1223 /* 0xee */ { NULL, NULL, 0 },
1224 /* 0xef */ { NULL, NULL, 0 },
1225 /* 0xf0 */ { NULL, NULL, 0 },
1226 /* 0xf1 */ { NULL, NULL, 0 },
1227 /* 0xf2 */ { NULL, NULL, 0 },
1228 /* 0xf3 */ { NULL, NULL, 0 },
1229 /* 0xf4 */ { NULL, NULL, 0 },
1230 /* 0xf5 */ { NULL, NULL, 0 },
1231 /* 0xf6 */ { NULL, NULL, 0 },
1232 /* 0xf7 */ { NULL, NULL, 0 },
1233 /* 0xf8 */ { NULL, NULL, 0 },
1234 /* 0xf9 */ { NULL, NULL, 0 },
1235 /* 0xfa */ { NULL, NULL, 0 },
1236 /* 0xfb */ { NULL, NULL, 0 },
1237 /* 0xfc */ { NULL, NULL, 0 },
1238 /* 0xfd */ { NULL, NULL, 0 },
1239 /* 0xfe */ { NULL, NULL, 0 },
1240 /* 0xff */ { NULL, NULL, 0 }
1244 /*******************************************************************
1245 allocate and initialize a reply packet
1246 ********************************************************************/
1248 void reply_outbuf(struct smb_request *req, uint8 num_words, uint32 num_bytes)
1251 * Protect against integer wrap
1253 if ((num_bytes > 0xffffff)
1254 || ((num_bytes + smb_size + num_words*2) > 0xffffff)) {
1256 if (asprintf(&msg, "num_bytes too large: %u",
1257 (unsigned)num_bytes) == -1) {
1258 msg = CONST_DISCARD(char *, "num_bytes too large");
1263 if (!(req->outbuf = TALLOC_ARRAY(
1265 smb_size + num_words*2 + num_bytes))) {
1266 smb_panic("could not allocate output buffer\n");
1269 construct_reply_common((char *)req->inbuf, (char *)req->outbuf);
1270 srv_set_message((char *)req->outbuf, num_words, num_bytes, false);
1272 * Zero out the word area, the caller has to take care of the bcc area
1275 if (num_words != 0) {
1276 memset(req->outbuf + smb_vwv0, 0, num_words*2);
1283 /*******************************************************************
1284 Dump a packet to a file.
1285 ********************************************************************/
1287 static void smb_dump(const char *name, int type, const char *data, ssize_t len)
1291 if (DEBUGLEVEL < 50) {
1295 if (len < 4) len = smb_len(data)+4;
1296 for (i=1;i<100;i++) {
1297 if (asprintf(&fname, "/tmp/%s.%d.%s", name, i,
1298 type ? "req" : "resp") == -1) {
1301 fd = open(fname, O_WRONLY|O_CREAT|O_EXCL, 0644);
1302 if (fd != -1 || errno != EEXIST) break;
1305 ssize_t ret = write(fd, data, len);
1307 DEBUG(0,("smb_dump: problem: write returned %d\n", (int)ret ));
1309 DEBUG(0,("created %s len %lu\n", fname, (unsigned long)len));
1314 /****************************************************************************
1315 Prepare everything for calling the actual request function, and potentially
1316 call the request function via the "new" interface.
1318 Return False if the "legacy" function needs to be called, everything is
1321 Return True if we're done.
1323 I know this API sucks, but it is the one with the least code change I could
1325 ****************************************************************************/
1327 static connection_struct *switch_message(uint8 type, struct smb_request *req, int size)
1331 connection_struct *conn = NULL;
1333 static uint16 last_session_tag = UID_FIELD_INVALID;
1337 /* Make sure this is an SMB packet. smb_size contains NetBIOS header
1338 * so subtract 4 from it. */
1339 if (!valid_smb_header(req->inbuf)
1340 || (size < (smb_size - 4))) {
1341 DEBUG(2,("Non-SMB packet of length %d. Terminating server\n",
1342 smb_len(req->inbuf)));
1343 exit_server_cleanly("Non-SMB packet");
1346 if (smb_messages[type].fn_new == NULL) {
1347 DEBUG(0,("Unknown message type %d!\n",type));
1348 smb_dump("Unknown", 1, (char *)req->inbuf, size);
1349 reply_unknown_new(req, type);
1353 flags = smb_messages[type].flags;
1355 /* In share mode security we must ignore the vuid. */
1356 session_tag = (lp_security() == SEC_SHARE)
1357 ? UID_FIELD_INVALID : req->vuid;
1360 DEBUG(3,("switch message %s (pid %d) conn 0x%lx\n", smb_fn_name(type),
1361 (int)sys_getpid(), (unsigned long)conn));
1363 smb_dump(smb_fn_name(type), 1, (char *)req->inbuf, size);
1365 /* Ensure this value is replaced in the incoming packet. */
1366 SSVAL(req->inbuf,smb_uid,session_tag);
1369 * Ensure the correct username is in current_user_info. This is a
1370 * really ugly bugfix for problems with multiple session_setup_and_X's
1371 * being done and allowing %U and %G substitutions to work correctly.
1372 * There is a reason this code is done here, don't move it unless you
1373 * know what you're doing... :-).
1377 if (session_tag != last_session_tag) {
1378 user_struct *vuser = NULL;
1380 last_session_tag = session_tag;
1381 if(session_tag != UID_FIELD_INVALID) {
1382 vuser = get_valid_user_struct(session_tag);
1384 set_current_user_info(&vuser->user);
1389 /* Does this call need to be run as the connected user? */
1390 if (flags & AS_USER) {
1392 /* Does this call need a valid tree connection? */
1395 * Amazingly, the error code depends on the command
1398 if (type == SMBntcreateX) {
1399 reply_nterror(req, NT_STATUS_INVALID_HANDLE);
1401 reply_doserror(req, ERRSRV, ERRinvnid);
1406 if (!change_to_user(conn,session_tag)) {
1407 reply_nterror(req, NT_STATUS_DOS(ERRSRV, ERRbaduid));
1411 /* All NEED_WRITE and CAN_IPC flags must also have AS_USER. */
1413 /* Does it need write permission? */
1414 if ((flags & NEED_WRITE) && !CAN_WRITE(conn)) {
1415 reply_nterror(req, NT_STATUS_MEDIA_WRITE_PROTECTED);
1419 /* IPC services are limited */
1420 if (IS_IPC(conn) && !(flags & CAN_IPC)) {
1421 reply_doserror(req, ERRSRV,ERRaccess);
1425 /* This call needs to be run as root */
1426 change_to_root_user();
1429 /* load service specific parameters */
1431 if (req->encrypted) {
1432 conn->encrypted_tid = true;
1433 /* encrypted required from now on. */
1434 conn->encrypt_level = Required;
1435 } else if (ENCRYPTION_REQUIRED(conn)) {
1436 uint8 com = CVAL(req->inbuf,smb_com);
1437 if (com != SMBtrans2 && com != SMBtranss2) {
1438 exit_server_cleanly("encryption required "
1444 if (!set_current_service(conn,SVAL(req->inbuf,smb_flg),
1445 (flags & (AS_USER|DO_CHDIR)
1447 reply_doserror(req, ERRSRV, ERRaccess);
1450 conn->num_smb_operations++;
1453 /* does this protocol need to be run as guest? */
1454 if ((flags & AS_GUEST)
1455 && (!change_to_guest() ||
1456 !check_access(smbd_server_fd(), lp_hostsallow(-1),
1457 lp_hostsdeny(-1)))) {
1458 reply_doserror(req, ERRSRV, ERRaccess);
1462 smb_messages[type].fn_new(req);
1466 /****************************************************************************
1467 Construct a reply to the incoming packet.
1468 ****************************************************************************/
1470 static void construct_reply(char *inbuf, int size, size_t unread_bytes, bool encrypted)
1472 uint8 type = CVAL(inbuf,smb_com);
1473 connection_struct *conn;
1474 struct smb_request *req;
1480 if (!(req = talloc(talloc_tos(), struct smb_request))) {
1481 smb_panic("could not allocate smb_request");
1483 init_smb_request(req, (uint8 *)inbuf, unread_bytes, encrypted);
1485 conn = switch_message(type, req, size);
1487 if (req->unread_bytes) {
1488 /* writeX failed. drain socket. */
1489 if (drain_socket(smbd_server_fd(), req->unread_bytes) !=
1490 req->unread_bytes) {
1491 smb_panic("failed to drain pending bytes");
1493 req->unread_bytes = 0;
1496 if (req->outbuf == NULL) {
1500 if (CVAL(req->outbuf,0) == 0) {
1501 show_msg((char *)req->outbuf);
1504 if (!srv_send_smb(smbd_server_fd(),
1505 (char *)req->outbuf,
1506 IS_CONN_ENCRYPTED(conn)||req->encrypted)) {
1507 exit_server_cleanly("construct_reply: srv_send_smb failed.");
1515 /****************************************************************************
1516 Process an smb from the client
1517 ****************************************************************************/
1519 static void process_smb(char *inbuf, size_t nread, size_t unread_bytes, bool encrypted)
1521 static int trans_num;
1522 int msg_type = CVAL(inbuf,0);
1524 DO_PROFILE_INC(smb_count);
1526 if (trans_num == 0) {
1527 char addr[INET6_ADDRSTRLEN];
1529 /* on the first packet, check the global hosts allow/ hosts
1530 deny parameters before doing any parsing of the packet
1531 passed to us by the client. This prevents attacks on our
1532 parsing code from hosts not in the hosts allow list */
1534 if (!check_access(smbd_server_fd(), lp_hostsallow(-1),
1535 lp_hostsdeny(-1))) {
1536 /* send a negative session response "not listening on calling name" */
1537 static unsigned char buf[5] = {0x83, 0, 0, 1, 0x81};
1538 DEBUG( 1, ( "Connection denied from %s\n",
1539 client_addr(get_client_fd(),addr,sizeof(addr)) ) );
1540 (void)srv_send_smb(smbd_server_fd(),(char *)buf,false);
1541 exit_server_cleanly("connection denied");
1545 DEBUG( 6, ( "got message type 0x%x of len 0x%x\n", msg_type,
1547 DEBUG( 3, ( "Transaction %d of length %d (%u toread)\n", trans_num,
1549 (unsigned int)unread_bytes ));
1551 if (msg_type != 0) {
1553 * NetBIOS session request, keepalive, etc.
1555 reply_special(inbuf);
1561 construct_reply(inbuf,nread,unread_bytes,encrypted);
1566 /****************************************************************************
1567 Return a string containing the function name of a SMB command.
1568 ****************************************************************************/
1570 const char *smb_fn_name(int type)
1572 const char *unknown_name = "SMBunknown";
1574 if (smb_messages[type].name == NULL)
1575 return(unknown_name);
1577 return(smb_messages[type].name);
1580 /****************************************************************************
1581 Helper functions for contruct_reply.
1582 ****************************************************************************/
1584 static uint32 common_flags2 = FLAGS2_LONG_PATH_COMPONENTS|FLAGS2_32_BIT_ERROR_CODES;
1586 void add_to_common_flags2(uint32 v)
1591 void remove_from_common_flags2(uint32 v)
1593 common_flags2 &= ~v;
1596 void construct_reply_common(const char *inbuf, char *outbuf)
1598 srv_set_message(outbuf,0,0,false);
1600 SCVAL(outbuf,smb_com,CVAL(inbuf,smb_com));
1601 SIVAL(outbuf,smb_rcls,0);
1602 SCVAL(outbuf,smb_flg, FLAG_REPLY | (CVAL(inbuf,smb_flg) & FLAG_CASELESS_PATHNAMES));
1603 SSVAL(outbuf,smb_flg2,
1604 (SVAL(inbuf,smb_flg2) & FLAGS2_UNICODE_STRINGS) |
1606 memset(outbuf+smb_pidhigh,'\0',(smb_tid-smb_pidhigh));
1608 SSVAL(outbuf,smb_tid,SVAL(inbuf,smb_tid));
1609 SSVAL(outbuf,smb_pid,SVAL(inbuf,smb_pid));
1610 SSVAL(outbuf,smb_uid,SVAL(inbuf,smb_uid));
1611 SSVAL(outbuf,smb_mid,SVAL(inbuf,smb_mid));
1614 /****************************************************************************
1615 Construct a chained reply and add it to the already made reply
1616 ****************************************************************************/
1618 void chain_reply(struct smb_request *req)
1620 static char *orig_inbuf;
1623 * Dirty little const_discard: We mess with req->inbuf, which is
1624 * declared as const. If maybe at some point this routine gets
1625 * rewritten, this const_discard could go away.
1627 char *inbuf = CONST_DISCARD(char *, req->inbuf);
1628 int size = smb_len(req->inbuf)+4;
1630 int smb_com1, smb_com2 = CVAL(inbuf,smb_vwv0);
1631 unsigned smb_off2 = SVAL(inbuf,smb_vwv1);
1635 char inbuf_saved[smb_wct];
1636 char *outbuf = (char *)req->outbuf;
1637 size_t outsize = smb_len(outbuf) + 4;
1638 size_t outsize_padded;
1639 size_t ofs, to_move;
1641 struct smb_request *req2;
1642 size_t caller_outputlen;
1643 char *caller_output;
1645 /* Maybe its not chained, or it's an error packet. */
1646 if (smb_com2 == 0xFF || SVAL(outbuf,smb_rcls) != 0) {
1647 SCVAL(outbuf,smb_vwv0,0xFF);
1651 if (chain_size == 0) {
1652 /* this is the first part of the chain */
1657 * We need to save the output the caller added to the chain so that we
1658 * can splice it into the final output buffer later.
1661 caller_outputlen = outsize - smb_wct;
1663 caller_output = (char *)memdup(outbuf + smb_wct, caller_outputlen);
1665 if (caller_output == NULL) {
1666 /* TODO: NT_STATUS_NO_MEMORY */
1667 smb_panic("could not dup outbuf");
1671 * The original Win95 redirector dies on a reply to
1672 * a lockingX and read chain unless the chain reply is
1673 * 4 byte aligned. JRA.
1676 outsize_padded = (outsize + 3) & ~3;
1679 * remember how much the caller added to the chain, only counting
1680 * stuff after the parameter words
1682 chain_size += (outsize_padded - smb_wct);
1685 * work out pointers into the original packets. The
1686 * headers on these need to be filled in
1688 inbuf2 = orig_inbuf + smb_off2 + 4 - smb_wct;
1690 /* remember the original command type */
1691 smb_com1 = CVAL(orig_inbuf,smb_com);
1693 /* save the data which will be overwritten by the new headers */
1694 memcpy(inbuf_saved,inbuf2,smb_wct);
1696 /* give the new packet the same header as the last part of the SMB */
1697 memmove(inbuf2,inbuf,smb_wct);
1699 /* create the in buffer */
1700 SCVAL(inbuf2,smb_com,smb_com2);
1702 /* work out the new size for the in buffer. */
1703 new_size = size - (inbuf2 - inbuf);
1705 DEBUG(0,("chain_reply: chain packet size incorrect "
1706 "(orig size = %d, offset = %d)\n",
1707 size, (int)(inbuf2 - inbuf) ));
1708 exit_server_cleanly("Bad chained packet");
1712 /* And set it in the header. */
1713 smb_setlen(inbuf2, new_size - 4);
1715 DEBUG(3,("Chained message\n"));
1718 if (!(req2 = talloc(talloc_tos(), struct smb_request))) {
1719 smb_panic("could not allocate smb_request");
1721 init_smb_request(req2, (uint8 *)inbuf2,0, req->encrypted);
1723 /* process the request */
1724 switch_message(smb_com2, req2, new_size);
1727 * We don't accept deferred operations in chained requests.
1729 SMB_ASSERT(req2->outbuf != NULL);
1730 outsize2 = smb_len(req2->outbuf)+4;
1733 * Move away the new command output so that caller_output fits in,
1734 * copy in the caller_output saved above.
1737 SMB_ASSERT(outsize_padded >= smb_wct);
1740 * "ofs" is the space we need for caller_output. Equal to
1741 * caller_outputlen plus the padding.
1744 ofs = outsize_padded - smb_wct;
1747 * "to_move" is the amount of bytes the secondary routine gave us
1750 to_move = outsize2 - smb_wct;
1752 if (to_move + ofs + smb_wct + chain_size > max_send) {
1753 smb_panic("replies too large -- would have to cut");
1757 * In the "new" API "outbuf" is allocated via reply_outbuf, just for
1758 * the first request in the chain. So we have to re-allocate it. In
1759 * the "old" API the only outbuf ever used is the global OutBuffer
1760 * which is always large enough.
1763 outbuf = TALLOC_REALLOC_ARRAY(NULL, outbuf, char,
1764 to_move + ofs + smb_wct);
1765 if (outbuf == NULL) {
1766 smb_panic("could not realloc outbuf");
1769 req->outbuf = (uint8 *)outbuf;
1771 memmove(outbuf + smb_wct + ofs, req2->outbuf + smb_wct, to_move);
1772 memcpy(outbuf + smb_wct, caller_output, caller_outputlen);
1775 * copy the new reply header over the old one but preserve the smb_com
1778 memmove(outbuf, req2->outbuf, smb_wct);
1779 SCVAL(outbuf, smb_com, smb_com1);
1782 * We've just copied in the whole "wct" area from the secondary
1783 * function. Fix up the chaining: com2 and the offset need to be
1787 SCVAL(outbuf, smb_vwv0, smb_com2);
1788 SSVAL(outbuf, smb_vwv1, chain_size + smb_wct - 4);
1790 if (outsize_padded > outsize) {
1793 * Due to padding we have some uninitialized bytes after the
1797 memset(outbuf + outsize, 0, outsize_padded - outsize);
1800 smb_setlen(outbuf, outsize2 + chain_size - 4);
1803 * restore the saved data, being careful not to overwrite any data
1804 * from the reply header
1806 memcpy(inbuf2,inbuf_saved,smb_wct);
1808 SAFE_FREE(caller_output);
1812 * Reset the chain_size for our caller's offset calculations
1815 chain_size -= (outsize_padded - smb_wct);
1820 /****************************************************************************
1821 Setup the needed select timeout in milliseconds.
1822 ****************************************************************************/
1824 static int setup_select_timeout(void)
1828 select_timeout = SMBD_SELECT_TIMEOUT*1000;
1830 if (print_notify_messages_pending()) {
1831 select_timeout = MIN(select_timeout, 1000);
1834 return select_timeout;
1837 /****************************************************************************
1838 Check if services need reloading.
1839 ****************************************************************************/
1841 void check_reload(time_t t)
1843 static pid_t mypid = 0;
1844 static time_t last_smb_conf_reload_time = 0;
1845 static time_t last_printer_reload_time = 0;
1846 time_t printcap_cache_time = (time_t)lp_printcap_cache_time();
1848 if(last_smb_conf_reload_time == 0) {
1849 last_smb_conf_reload_time = t;
1850 /* Our printing subsystem might not be ready at smbd start up.
1851 Then no printer is available till the first printers check
1852 is performed. A lower initial interval circumvents this. */
1853 if ( printcap_cache_time > 60 )
1854 last_printer_reload_time = t - printcap_cache_time + 60;
1856 last_printer_reload_time = t;
1859 if (mypid != getpid()) { /* First time or fork happened meanwhile */
1860 /* randomize over 60 second the printcap reload to avoid all
1861 * process hitting cupsd at the same time */
1862 int time_range = 60;
1864 last_printer_reload_time += random() % time_range;
1868 if (reload_after_sighup || (t >= last_smb_conf_reload_time+SMBD_RELOAD_CHECK)) {
1869 reload_services(True);
1870 reload_after_sighup = False;
1871 last_smb_conf_reload_time = t;
1874 /* 'printcap cache time = 0' disable the feature */
1876 if ( printcap_cache_time != 0 )
1878 /* see if it's time to reload or if the clock has been set back */
1880 if ( (t >= last_printer_reload_time+printcap_cache_time)
1881 || (t-last_printer_reload_time < 0) )
1883 DEBUG( 3,( "Printcap cache time expired.\n"));
1885 last_printer_reload_time = t;
1890 /****************************************************************************
1891 Process any timeout housekeeping. Return False if the caller should exit.
1892 ****************************************************************************/
1894 static void timeout_processing(int *select_timeout,
1895 time_t *last_timeout_processing_time)
1899 *last_timeout_processing_time = t = time(NULL);
1901 /* become root again if waiting */
1902 change_to_root_user();
1904 /* check if we need to reload services */
1907 if(global_machine_password_needs_changing &&
1908 /* for ADS we need to do a regular ADS password change, not a domain
1910 lp_security() == SEC_DOMAIN) {
1912 unsigned char trust_passwd_hash[16];
1917 * We're in domain level security, and the code that
1918 * read the machine password flagged that the machine
1919 * password needs changing.
1923 * First, open the machine password file with an exclusive lock.
1926 lock = secrets_get_trust_account_lock(NULL, lp_workgroup());
1929 DEBUG(0,("process: unable to lock the machine account password for \
1930 machine %s in domain %s.\n", global_myname(), lp_workgroup() ));
1934 if(!secrets_fetch_trust_account_password(lp_workgroup(), trust_passwd_hash, &lct, NULL)) {
1935 DEBUG(0,("process: unable to read the machine account password for \
1936 machine %s in domain %s.\n", global_myname(), lp_workgroup()));
1942 * Make sure someone else hasn't already done this.
1945 if(t < lct + lp_machine_password_timeout()) {
1946 global_machine_password_needs_changing = False;
1951 /* always just contact the PDC here */
1953 change_trust_account_password( lp_workgroup(), NULL);
1954 global_machine_password_needs_changing = False;
1958 /* update printer queue caches if necessary */
1960 update_monitored_printq_cache();
1963 * Now we are root, check if the log files need pruning.
1964 * Force a log file check.
1966 force_check_log_size();
1969 /* Send any queued printer notify message to interested smbd's. */
1971 print_notify_send_messages(smbd_messaging_context(), 0);
1974 * Modify the select timeout depending upon
1975 * what we have remaining in our queues.
1978 *select_timeout = setup_select_timeout();
1983 /****************************************************************************
1984 Process commands from the client
1985 ****************************************************************************/
1987 void smbd_process(void)
1989 time_t last_timeout_processing_time = time(NULL);
1990 unsigned int num_smbs = 0;
1991 size_t unread_bytes = 0;
1993 max_recv = MIN(lp_maxxmit(),BUFFER_SIZE);
1996 int select_timeout = setup_select_timeout();
1999 size_t inbuf_len = 0;
2000 bool encrypted = false;
2001 TALLOC_CTX *frame = talloc_stackframe_pool(8192);
2005 /* Did someone ask for immediate checks on things like blocking locks ? */
2006 if (select_timeout == 0) {
2007 timeout_processing(&select_timeout,
2008 &last_timeout_processing_time);
2009 num_smbs = 0; /* Reset smb counter. */
2012 run_events(smbd_event_context(), 0, NULL, NULL);
2017 status = receive_message_or_smb(
2018 talloc_tos(), &inbuf, &inbuf_len,
2019 select_timeout, &unread_bytes, &encrypted);
2021 if (NT_STATUS_IS_OK(status)) {
2025 if (NT_STATUS_EQUAL(status, NT_STATUS_IO_TIMEOUT)) {
2028 &last_timeout_processing_time);
2032 DEBUG(3, ("receive_message_or_smb failed: %s, "
2033 "exiting\n", nt_errstr(status)));
2036 num_smbs = 0; /* Reset smb counter. */
2041 * Ensure we do timeout processing if the SMB we just got was
2042 * only an echo request. This allows us to set the select
2043 * timeout in 'receive_message_or_smb()' to any value we like
2044 * without worrying that the client will send echo requests
2045 * faster than the select timeout, thus starving out the
2046 * essential processing (change notify, blocking locks) that
2047 * the timeout code does. JRA.
2049 num_echos = smb_echo_count;
2051 process_smb(inbuf, inbuf_len, unread_bytes, encrypted);
2055 if (smb_echo_count != num_echos) {
2056 timeout_processing(&select_timeout,
2057 &last_timeout_processing_time);
2058 num_smbs = 0; /* Reset smb counter. */
2064 * If we are getting smb requests in a constant stream
2065 * with no echos, make sure we attempt timeout processing
2066 * every select_timeout milliseconds - but only check for this
2067 * every 200 smb requests.
2070 if ((num_smbs % 200) == 0) {
2071 time_t new_check_time = time(NULL);
2072 if(new_check_time - last_timeout_processing_time >= (select_timeout/1000)) {
2075 &last_timeout_processing_time);
2076 num_smbs = 0; /* Reset smb counter. */
2077 last_timeout_processing_time = new_check_time; /* Reset time. */
2081 /* The timeout_processing function isn't run nearly
2082 often enough to implement 'max log size' without
2083 overrunning the size of the file by many megabytes.
2084 This is especially true if we are running at debug
2085 level 10. Checking every 50 SMBs is a nice
2086 tradeoff of performance vs log file size overrun. */
2088 if ((num_smbs % 50) == 0 && need_to_check_log_size()) {
2089 change_to_root_user();