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 /* Accessor function for smb_read_error for smbd functions. */
42 /****************************************************************************
44 ****************************************************************************/
46 bool srv_send_smb(int fd, char *buffer, bool do_encrypt)
51 char *buf_out = buffer;
53 /* Sign the outgoing packet if required. */
54 srv_calculate_sign_mac(buf_out);
57 NTSTATUS status = srv_encrypt_buffer(buffer, &buf_out);
58 if (!NT_STATUS_IS_OK(status)) {
59 DEBUG(0, ("send_smb: SMB encryption failed "
60 "on outgoing packet! Error %s\n",
66 len = smb_len(buf_out) + 4;
68 while (nwritten < len) {
69 ret = write_data(fd,buf_out+nwritten,len - nwritten);
71 DEBUG(0,("Error writing %d bytes to client. %d. (%s)\n",
72 (int)len,(int)ret, strerror(errno) ));
73 srv_free_enc_buffer(buf_out);
79 srv_free_enc_buffer(buf_out);
83 /*******************************************************************
84 Setup the word count and byte count for a smb message.
85 ********************************************************************/
87 int srv_set_message(char *buf,
92 if (zero && (num_words || num_bytes)) {
93 memset(buf + smb_size,'\0',num_words*2 + num_bytes);
95 SCVAL(buf,smb_wct,num_words);
96 SSVAL(buf,smb_vwv + num_words*SIZEOFWORD,num_bytes);
97 smb_setlen(buf,(smb_size + num_words*2 + num_bytes - 4));
98 return (smb_size + num_words*2 + num_bytes);
101 static bool valid_smb_header(const uint8_t *inbuf)
103 if (is_encrypted_packet(inbuf)) {
107 * This used to be (strncmp(smb_base(inbuf),"\377SMB",4) == 0)
108 * but it just looks weird to call strncmp for this one.
110 return (IVAL(smb_base(inbuf), 0) == 0x424D53FF);
113 /* Socket functions for smbd packet processing. */
115 static bool valid_packet_size(size_t len)
118 * A WRITEX with CAP_LARGE_WRITEX can be 64k worth of data plus 65 bytes
119 * of header. Don't print the error if this fits.... JRA.
122 if (len > (BUFFER_SIZE + LARGE_WRITEX_HDR_SIZE)) {
123 DEBUG(0,("Invalid packet length! (%lu bytes).\n",
124 (unsigned long)len));
130 static NTSTATUS read_packet_remainder(int fd, char *buffer,
131 unsigned int timeout, ssize_t len)
137 return read_socket_with_timeout(fd, buffer, len, len, timeout, NULL);
140 /****************************************************************************
141 Attempt a zerocopy writeX read. We know here that len > smb_size-4
142 ****************************************************************************/
145 * Unfortunately, earlier versions of smbclient/libsmbclient
146 * don't send this "standard" writeX header. I've fixed this
147 * for 3.2 but we'll use the old method with earlier versions.
148 * Windows and CIFSFS at least use this standard size. Not
152 #define STANDARD_WRITE_AND_X_HEADER_SIZE (smb_size - 4 + /* basic header */ \
153 (2*14) + /* word count (including bcc) */ \
156 static NTSTATUS receive_smb_raw_talloc_partial_read(TALLOC_CTX *mem_ctx,
157 const char lenbuf[4],
158 int fd, char **buffer,
159 unsigned int timeout,
163 /* Size of a WRITEX call (+4 byte len). */
164 char writeX_header[4 + STANDARD_WRITE_AND_X_HEADER_SIZE];
165 ssize_t len = smb_len_large(lenbuf); /* Could be a UNIX large writeX. */
169 memcpy(writeX_header, lenbuf, 4);
171 status = read_socket_with_timeout(
172 fd, writeX_header + 4,
173 STANDARD_WRITE_AND_X_HEADER_SIZE,
174 STANDARD_WRITE_AND_X_HEADER_SIZE,
177 if (!NT_STATUS_IS_OK(status)) {
182 * Ok - now try and see if this is a possible
186 if (is_valid_writeX_buffer((uint8_t *)writeX_header)) {
188 * If the data offset is beyond what
189 * we've read, drain the extra bytes.
191 uint16_t doff = SVAL(writeX_header,smb_vwv11);
194 if (doff > STANDARD_WRITE_AND_X_HEADER_SIZE) {
195 size_t drain = doff - STANDARD_WRITE_AND_X_HEADER_SIZE;
196 if (drain_socket(smbd_server_fd(), drain) != drain) {
197 smb_panic("receive_smb_raw_talloc_partial_read:"
198 " failed to drain pending bytes");
201 doff = STANDARD_WRITE_AND_X_HEADER_SIZE;
204 /* Spoof down the length and null out the bcc. */
205 set_message_bcc(writeX_header, 0);
206 newlen = smb_len(writeX_header);
208 /* Copy the header we've written. */
210 *buffer = (char *)TALLOC_MEMDUP(mem_ctx,
212 sizeof(writeX_header));
214 if (*buffer == NULL) {
215 DEBUG(0, ("Could not allocate inbuf of length %d\n",
216 (int)sizeof(writeX_header)));
217 return NT_STATUS_NO_MEMORY;
220 /* Work out the remaining bytes. */
221 *p_unread = len - STANDARD_WRITE_AND_X_HEADER_SIZE;
222 *len_ret = newlen + 4;
226 if (!valid_packet_size(len)) {
227 return NT_STATUS_INVALID_PARAMETER;
231 * Not a valid writeX call. Just do the standard
235 *buffer = TALLOC_ARRAY(mem_ctx, char, len+4);
237 if (*buffer == NULL) {
238 DEBUG(0, ("Could not allocate inbuf of length %d\n",
240 return NT_STATUS_NO_MEMORY;
243 /* Copy in what we already read. */
246 4 + STANDARD_WRITE_AND_X_HEADER_SIZE);
247 toread = len - STANDARD_WRITE_AND_X_HEADER_SIZE;
250 status = read_packet_remainder(
251 fd, (*buffer) + 4 + STANDARD_WRITE_AND_X_HEADER_SIZE,
254 if (!NT_STATUS_IS_OK(status)) {
255 DEBUG(10, ("receive_smb_raw_talloc_partial_read: %s\n",
265 static NTSTATUS receive_smb_raw_talloc(TALLOC_CTX *mem_ctx, int fd,
266 char **buffer, unsigned int timeout,
267 size_t *p_unread, size_t *plen)
271 int min_recv_size = lp_min_receive_file_size();
276 status = read_smb_length_return_keepalive(fd, lenbuf, timeout, &len);
277 if (!NT_STATUS_IS_OK(status)) {
278 DEBUG(10, ("receive_smb_raw: %s\n", nt_errstr(status)));
282 if (CVAL(lenbuf,0) == 0 &&
284 smb_len_large(lenbuf) > min_recv_size && /* Could be a UNIX large writeX. */
285 !srv_is_signing_active()) {
287 return receive_smb_raw_talloc_partial_read(
288 mem_ctx, lenbuf, fd, buffer, timeout, p_unread, plen);
291 if (!valid_packet_size(len)) {
292 return NT_STATUS_INVALID_PARAMETER;
296 * The +4 here can't wrap, we've checked the length above already.
299 *buffer = TALLOC_ARRAY(mem_ctx, char, len+4);
301 if (*buffer == NULL) {
302 DEBUG(0, ("Could not allocate inbuf of length %d\n",
304 return NT_STATUS_NO_MEMORY;
307 memcpy(*buffer, lenbuf, sizeof(lenbuf));
309 status = read_packet_remainder(fd, (*buffer)+4, timeout, len);
310 if (!NT_STATUS_IS_OK(status)) {
318 static NTSTATUS receive_smb_talloc(TALLOC_CTX *mem_ctx, int fd,
319 char **buffer, unsigned int timeout,
320 size_t *p_unread, bool *p_encrypted,
326 *p_encrypted = false;
328 status = receive_smb_raw_talloc(mem_ctx, fd, buffer, timeout,
330 if (!NT_STATUS_IS_OK(status)) {
334 if (is_encrypted_packet((uint8_t *)*buffer)) {
335 status = srv_decrypt_buffer(*buffer);
336 if (!NT_STATUS_IS_OK(status)) {
337 DEBUG(0, ("receive_smb_talloc: SMB decryption failed on "
338 "incoming packet! Error %s\n",
339 nt_errstr(status) ));
345 /* Check the incoming SMB signature. */
346 if (!srv_check_sign_mac(*buffer, true)) {
347 DEBUG(0, ("receive_smb: SMB Signature verification failed on "
348 "incoming packet!\n"));
349 return NT_STATUS_INVALID_NETWORK_RESPONSE;
357 * Initialize a struct smb_request from an inbuf
360 void init_smb_request(struct smb_request *req,
365 size_t req_size = smb_len(inbuf) + 4;
366 /* Ensure we have at least smb_size bytes. */
367 if (req_size < smb_size) {
368 DEBUG(0,("init_smb_request: invalid request size %u\n",
369 (unsigned int)req_size ));
370 exit_server_cleanly("Invalid SMB request");
372 req->cmd = CVAL(inbuf, smb_com);
373 req->flags2 = SVAL(inbuf, smb_flg2);
374 req->smbpid = SVAL(inbuf, smb_pid);
375 req->mid = SVAL(inbuf, smb_mid);
376 req->vuid = SVAL(inbuf, smb_uid);
377 req->tid = SVAL(inbuf, smb_tid);
378 req->wct = CVAL(inbuf, smb_wct);
379 req->vwv = (uint16_t *)(inbuf+smb_vwv);
380 req->buflen = smb_buflen(inbuf);
381 req->buf = (const uint8_t *)smb_buf(inbuf);
382 req->unread_bytes = unread_bytes;
383 req->encrypted = encrypted;
384 req->conn = conn_find(req->tid);
385 req->chain_fsp = NULL;
387 /* Ensure we have at least wct words and 2 bytes of bcc. */
388 if (smb_size + req->wct*2 > req_size) {
389 DEBUG(0,("init_smb_request: invalid wct number %u (size %u)\n",
390 (unsigned int)req->wct,
391 (unsigned int)req_size));
392 exit_server_cleanly("Invalid SMB request");
394 /* Ensure bcc is correct. */
395 if (((uint8 *)smb_buf(inbuf)) + req->buflen > inbuf + req_size) {
396 DEBUG(0,("init_smb_request: invalid bcc number %u "
397 "(wct = %u, size %u)\n",
398 (unsigned int)req->buflen,
399 (unsigned int)req->wct,
400 (unsigned int)req_size));
401 exit_server_cleanly("Invalid SMB request");
407 /****************************************************************************
408 structure to hold a linked list of queued messages.
410 ****************************************************************************/
412 static struct pending_message_list *deferred_open_queue;
414 /****************************************************************************
415 Function to push a message onto the tail of a linked list of smb messages ready
417 ****************************************************************************/
419 static bool push_queued_message(struct smb_request *req,
420 struct timeval request_time,
421 struct timeval end_time,
422 char *private_data, size_t private_len)
424 int msg_len = smb_len(req->inbuf) + 4;
425 struct pending_message_list *msg;
427 msg = TALLOC_ZERO_P(NULL, struct pending_message_list);
430 DEBUG(0,("push_message: malloc fail (1)\n"));
434 msg->buf = data_blob_talloc(msg, req->inbuf, msg_len);
435 if(msg->buf.data == NULL) {
436 DEBUG(0,("push_message: malloc fail (2)\n"));
441 msg->request_time = request_time;
442 msg->end_time = end_time;
443 msg->encrypted = req->encrypted;
446 msg->private_data = data_blob_talloc(msg, private_data,
448 if (msg->private_data.data == NULL) {
449 DEBUG(0,("push_message: malloc fail (3)\n"));
455 DLIST_ADD_END(deferred_open_queue, msg, struct pending_message_list *);
457 DEBUG(10,("push_message: pushed message length %u on "
458 "deferred_open_queue\n", (unsigned int)msg_len));
463 /****************************************************************************
464 Function to delete a sharing violation open message by mid.
465 ****************************************************************************/
467 void remove_deferred_open_smb_message(uint16 mid)
469 struct pending_message_list *pml;
471 for (pml = deferred_open_queue; pml; pml = pml->next) {
472 if (mid == SVAL(pml->buf.data,smb_mid)) {
473 DEBUG(10,("remove_sharing_violation_open_smb_message: "
474 "deleting mid %u len %u\n",
476 (unsigned int)pml->buf.length ));
477 DLIST_REMOVE(deferred_open_queue, pml);
484 /****************************************************************************
485 Move a sharing violation open retry message to the front of the list and
486 schedule it for immediate processing.
487 ****************************************************************************/
489 void schedule_deferred_open_smb_message(uint16 mid)
491 struct pending_message_list *pml;
494 for (pml = deferred_open_queue; pml; pml = pml->next) {
495 uint16 msg_mid = SVAL(pml->buf.data,smb_mid);
496 DEBUG(10,("schedule_deferred_open_smb_message: [%d] msg_mid = %u\n", i++,
497 (unsigned int)msg_mid ));
498 if (mid == msg_mid) {
499 DEBUG(10,("schedule_deferred_open_smb_message: scheduling mid %u\n",
501 pml->end_time.tv_sec = 0;
502 pml->end_time.tv_usec = 0;
503 DLIST_PROMOTE(deferred_open_queue, pml);
508 DEBUG(10,("schedule_deferred_open_smb_message: failed to find message mid %u\n",
512 /****************************************************************************
513 Return true if this mid is on the deferred queue.
514 ****************************************************************************/
516 bool open_was_deferred(uint16 mid)
518 struct pending_message_list *pml;
520 for (pml = deferred_open_queue; pml; pml = pml->next) {
521 if (SVAL(pml->buf.data,smb_mid) == mid) {
528 /****************************************************************************
529 Return the message queued by this mid.
530 ****************************************************************************/
532 struct pending_message_list *get_open_deferred_message(uint16 mid)
534 struct pending_message_list *pml;
536 for (pml = deferred_open_queue; pml; pml = pml->next) {
537 if (SVAL(pml->buf.data,smb_mid) == mid) {
544 /****************************************************************************
545 Function to push a deferred open smb message onto a linked list of local smb
546 messages ready for processing.
547 ****************************************************************************/
549 bool push_deferred_smb_message(struct smb_request *req,
550 struct timeval request_time,
551 struct timeval timeout,
552 char *private_data, size_t priv_len)
554 struct timeval end_time;
556 if (req->unread_bytes) {
557 DEBUG(0,("push_deferred_smb_message: logic error ! "
558 "unread_bytes = %u\n",
559 (unsigned int)req->unread_bytes ));
560 smb_panic("push_deferred_smb_message: "
561 "logic error unread_bytes != 0" );
564 end_time = timeval_sum(&request_time, &timeout);
566 DEBUG(10,("push_deferred_open_smb_message: pushing message len %u mid %u "
567 "timeout time [%u.%06u]\n",
568 (unsigned int) smb_len(req->inbuf)+4, (unsigned int)req->mid,
569 (unsigned int)end_time.tv_sec,
570 (unsigned int)end_time.tv_usec));
572 return push_queued_message(req, request_time, end_time,
573 private_data, priv_len);
577 struct timed_event *te;
578 struct timeval interval;
580 bool (*handler)(const struct timeval *now, void *private_data);
584 static void idle_event_handler(struct event_context *ctx,
585 struct timed_event *te,
586 const struct timeval *now,
589 struct idle_event *event =
590 talloc_get_type_abort(private_data, struct idle_event);
592 TALLOC_FREE(event->te);
594 if (!event->handler(now, event->private_data)) {
595 /* Don't repeat, delete ourselves */
600 event->te = event_add_timed(ctx, event,
601 timeval_sum(now, &event->interval),
603 idle_event_handler, event);
605 /* We can't do much but fail here. */
606 SMB_ASSERT(event->te != NULL);
609 struct idle_event *event_add_idle(struct event_context *event_ctx,
611 struct timeval interval,
613 bool (*handler)(const struct timeval *now,
617 struct idle_event *result;
618 struct timeval now = timeval_current();
620 result = TALLOC_P(mem_ctx, struct idle_event);
621 if (result == NULL) {
622 DEBUG(0, ("talloc failed\n"));
626 result->interval = interval;
627 result->handler = handler;
628 result->private_data = private_data;
630 if (!(result->name = talloc_asprintf(result, "idle_evt(%s)", name))) {
631 DEBUG(0, ("talloc failed\n"));
636 result->te = event_add_timed(event_ctx, result,
637 timeval_sum(&now, &interval),
639 idle_event_handler, result);
640 if (result->te == NULL) {
641 DEBUG(0, ("event_add_timed failed\n"));
649 /****************************************************************************
650 Do all async processing in here. This includes kernel oplock messages, change
652 ****************************************************************************/
654 static void async_processing(fd_set *pfds)
656 DEBUG(10,("async_processing: Doing async processing.\n"));
660 process_kernel_oplocks(smbd_messaging_context(), pfds);
662 /* Do the aio check again after receive_local_message as it does a
663 select and may have eaten our signal. */
664 /* Is this till true? -- vl */
668 exit_server_cleanly("termination signal");
671 /* check for sighup processing */
672 if (reload_after_sighup) {
673 change_to_root_user();
674 DEBUG(1,("Reloading services after SIGHUP\n"));
675 reload_services(False);
676 reload_after_sighup = 0;
680 /****************************************************************************
681 Add a fd to the set we will be select(2)ing on.
682 ****************************************************************************/
684 static int select_on_fd(int fd, int maxfd, fd_set *fds)
688 maxfd = MAX(maxfd, fd);
694 /****************************************************************************
695 Do a select on an two fd's - with timeout.
697 If a local udp message has been pushed onto the
698 queue (this can only happen during oplock break
699 processing) call async_processing()
701 If a pending smb message has been pushed onto the
702 queue (this can only happen during oplock break
703 processing) return this next.
705 If the first smbfd is ready then read an smb from it.
706 if the second (loopback UDP) fd is ready then read a message
707 from it and setup the buffer header to identify the length
709 Returns False on timeout or error.
712 The timeout is in milliseconds
713 ****************************************************************************/
715 static NTSTATUS receive_message_or_smb(TALLOC_CTX *mem_ctx, char **buffer,
717 size_t *p_unread, bool *p_encrypted)
730 to.tv_sec = SMBD_SELECT_TIMEOUT;
734 * Note that this call must be before processing any SMB
735 * messages as we need to synchronously process any messages
736 * we may have sent to ourselves from the previous SMB.
738 message_dispatch(smbd_messaging_context());
741 * Check to see if we already have a message on the deferred open queue
742 * and it's time to schedule.
744 if(deferred_open_queue != NULL) {
745 bool pop_message = False;
746 struct pending_message_list *msg = deferred_open_queue;
748 if (timeval_is_zero(&msg->end_time)) {
755 tdif = usec_time_diff(&msg->end_time, &tv);
757 /* Timed out. Schedule...*/
759 DEBUG(10,("receive_message_or_smb: queued message timed out.\n"));
761 /* Make a more accurate select timeout. */
762 to.tv_sec = tdif / 1000000;
763 to.tv_usec = tdif % 1000000;
764 DEBUG(10,("receive_message_or_smb: select with timeout of [%u.%06u]\n",
765 (unsigned int)to.tv_sec, (unsigned int)to.tv_usec ));
771 *buffer = (char *)talloc_memdup(mem_ctx, msg->buf.data,
773 if (*buffer == NULL) {
774 DEBUG(0, ("talloc failed\n"));
775 return NT_STATUS_NO_MEMORY;
777 *buffer_len = msg->buf.length;
778 *p_encrypted = msg->encrypted;
780 /* We leave this message on the queue so the open code can
781 know this is a retry. */
782 DEBUG(5,("receive_message_or_smb: returning deferred open smb message.\n"));
788 * Setup the select fd sets.
795 * Ensure we process oplock break messages by preference.
796 * We have to do this before the select, after the select
797 * and if the select returns EINTR. This is due to the fact
798 * that the selects called from async_processing can eat an EINTR
799 * caused by a signal (we can't take the break message there).
800 * This is hideously complex - *MUST* be simplified for 3.0 ! JRA.
803 if (oplock_message_waiting(&r_fds)) {
804 DEBUG(10,("receive_message_or_smb: oplock_message is waiting.\n"));
805 async_processing(&r_fds);
807 * After async processing we must go and do the select again, as
808 * the state of the flag in fds for the server file descriptor is
809 * indeterminate - we may have done I/O on it in the oplock processing. JRA.
815 * Are there any timed events waiting ? If so, ensure we don't
816 * select for longer than it would take to wait for them.
823 event_add_to_select_args(smbd_event_context(), &now,
824 &r_fds, &w_fds, &to, &maxfd);
827 if (timeval_is_zero(&to)) {
828 /* Process a timed event now... */
829 if (run_events(smbd_event_context(), 0, NULL, NULL)) {
836 START_PROFILE(smbd_idle);
838 maxfd = select_on_fd(smbd_server_fd(), maxfd, &r_fds);
839 maxfd = select_on_fd(oplock_notify_fd(), maxfd, &r_fds);
841 selrtn = sys_select(maxfd+1,&r_fds,&w_fds,NULL,&to);
844 END_PROFILE(smbd_idle);
848 if (run_events(smbd_event_context(), selrtn, &r_fds, &w_fds)) {
852 /* if we get EINTR then maybe we have received an oplock
853 signal - treat this as select returning 1. This is ugly, but
854 is the best we can do until the oplock code knows more about
856 if (selrtn == -1 && errno == EINTR) {
857 async_processing(&r_fds);
859 * After async processing we must go and do the select again, as
860 * the state of the flag in fds for the server file descriptor is
861 * indeterminate - we may have done I/O on it in the oplock processing. JRA.
868 /* something is wrong. Maybe the socket is dead? */
869 return map_nt_error_from_unix(errno);
872 /* Did we timeout ? */
878 * Ensure we process oplock break messages by preference.
879 * This is IMPORTANT ! Otherwise we can starve other processes
880 * sending us an oplock break message. JRA.
883 if (oplock_message_waiting(&r_fds)) {
884 async_processing(&r_fds);
886 * After async processing we must go and do the select again, as
887 * the state of the flag in fds for the server file descriptor is
888 * indeterminate - we may have done I/O on it in the oplock processing. JRA.
894 * We've just woken up from a protentially long select sleep.
895 * Ensure we process local messages as we need to synchronously
896 * process any messages from other smbd's to avoid file rename race
897 * conditions. This call is cheap if there are no messages waiting.
900 message_dispatch(smbd_messaging_context());
902 status = receive_smb_talloc(mem_ctx, smbd_server_fd(), buffer, 0,
903 p_unread, p_encrypted, &len);
905 if (!NT_STATUS_IS_OK(status)) {
915 * Only allow 5 outstanding trans requests. We're allocating memory, so
919 NTSTATUS allow_new_trans(struct trans_state *list, int mid)
922 for (; list != NULL; list = list->next) {
924 if (list->mid == mid) {
925 return NT_STATUS_INVALID_PARAMETER;
931 return NT_STATUS_INSUFFICIENT_RESOURCES;
937 /****************************************************************************
938 We're terminating and have closed all our files/connections etc.
939 If there are any pending local messages we need to respond to them
940 before termination so that other smbds don't think we just died whilst
942 ****************************************************************************/
944 void respond_to_all_remaining_local_messages(void)
947 * Assert we have no exclusive open oplocks.
950 if(get_number_of_exclusive_open_oplocks()) {
951 DEBUG(0,("respond_to_all_remaining_local_messages: PANIC : we have %d exclusive oplocks.\n",
952 get_number_of_exclusive_open_oplocks() ));
956 process_kernel_oplocks(smbd_messaging_context(), NULL);
963 These flags determine some of the permissions required to do an operation
965 Note that I don't set NEED_WRITE on some write operations because they
966 are used by some brain-dead clients when printing, and I don't want to
967 force write permissions on print services.
969 #define AS_USER (1<<0)
970 #define NEED_WRITE (1<<1) /* Must be paired with AS_USER */
971 #define TIME_INIT (1<<2)
972 #define CAN_IPC (1<<3) /* Must be paired with AS_USER */
973 #define AS_GUEST (1<<5) /* Must *NOT* be paired with AS_USER */
974 #define DO_CHDIR (1<<6)
977 define a list of possible SMB messages and their corresponding
978 functions. Any message that has a NULL function is unimplemented -
979 please feel free to contribute implementations!
981 static const struct smb_message_struct {
983 void (*fn)(struct smb_request *req);
985 } smb_messages[256] = {
987 /* 0x00 */ { "SMBmkdir",reply_mkdir,AS_USER | NEED_WRITE},
988 /* 0x01 */ { "SMBrmdir",reply_rmdir,AS_USER | NEED_WRITE},
989 /* 0x02 */ { "SMBopen",reply_open,AS_USER },
990 /* 0x03 */ { "SMBcreate",reply_mknew,AS_USER},
991 /* 0x04 */ { "SMBclose",reply_close,AS_USER | CAN_IPC },
992 /* 0x05 */ { "SMBflush",reply_flush,AS_USER},
993 /* 0x06 */ { "SMBunlink",reply_unlink,AS_USER | NEED_WRITE },
994 /* 0x07 */ { "SMBmv",reply_mv,AS_USER | NEED_WRITE },
995 /* 0x08 */ { "SMBgetatr",reply_getatr,AS_USER},
996 /* 0x09 */ { "SMBsetatr",reply_setatr,AS_USER | NEED_WRITE},
997 /* 0x0a */ { "SMBread",reply_read,AS_USER},
998 /* 0x0b */ { "SMBwrite",reply_write,AS_USER | CAN_IPC },
999 /* 0x0c */ { "SMBlock",reply_lock,AS_USER},
1000 /* 0x0d */ { "SMBunlock",reply_unlock,AS_USER},
1001 /* 0x0e */ { "SMBctemp",reply_ctemp,AS_USER },
1002 /* 0x0f */ { "SMBmknew",reply_mknew,AS_USER},
1003 /* 0x10 */ { "SMBcheckpath",reply_checkpath,AS_USER},
1004 /* 0x11 */ { "SMBexit",reply_exit,DO_CHDIR},
1005 /* 0x12 */ { "SMBlseek",reply_lseek,AS_USER},
1006 /* 0x13 */ { "SMBlockread",reply_lockread,AS_USER},
1007 /* 0x14 */ { "SMBwriteunlock",reply_writeunlock,AS_USER},
1008 /* 0x15 */ { NULL, NULL, 0 },
1009 /* 0x16 */ { NULL, NULL, 0 },
1010 /* 0x17 */ { NULL, NULL, 0 },
1011 /* 0x18 */ { NULL, NULL, 0 },
1012 /* 0x19 */ { NULL, NULL, 0 },
1013 /* 0x1a */ { "SMBreadbraw",reply_readbraw,AS_USER},
1014 /* 0x1b */ { "SMBreadBmpx",reply_readbmpx,AS_USER},
1015 /* 0x1c */ { "SMBreadBs",reply_readbs,AS_USER },
1016 /* 0x1d */ { "SMBwritebraw",reply_writebraw,AS_USER},
1017 /* 0x1e */ { "SMBwriteBmpx",reply_writebmpx,AS_USER},
1018 /* 0x1f */ { "SMBwriteBs",reply_writebs,AS_USER},
1019 /* 0x20 */ { "SMBwritec", NULL,0},
1020 /* 0x21 */ { NULL, NULL, 0 },
1021 /* 0x22 */ { "SMBsetattrE",reply_setattrE,AS_USER | NEED_WRITE },
1022 /* 0x23 */ { "SMBgetattrE",reply_getattrE,AS_USER },
1023 /* 0x24 */ { "SMBlockingX",reply_lockingX,AS_USER },
1024 /* 0x25 */ { "SMBtrans",reply_trans,AS_USER | CAN_IPC },
1025 /* 0x26 */ { "SMBtranss",reply_transs,AS_USER | CAN_IPC},
1026 /* 0x27 */ { "SMBioctl",reply_ioctl,0},
1027 /* 0x28 */ { "SMBioctls", NULL,AS_USER},
1028 /* 0x29 */ { "SMBcopy",reply_copy,AS_USER | NEED_WRITE },
1029 /* 0x2a */ { "SMBmove", NULL,AS_USER | NEED_WRITE },
1030 /* 0x2b */ { "SMBecho",reply_echo,0},
1031 /* 0x2c */ { "SMBwriteclose",reply_writeclose,AS_USER},
1032 /* 0x2d */ { "SMBopenX",reply_open_and_X,AS_USER | CAN_IPC },
1033 /* 0x2e */ { "SMBreadX",reply_read_and_X,AS_USER | CAN_IPC },
1034 /* 0x2f */ { "SMBwriteX",reply_write_and_X,AS_USER | CAN_IPC },
1035 /* 0x30 */ { NULL, NULL, 0 },
1036 /* 0x31 */ { NULL, NULL, 0 },
1037 /* 0x32 */ { "SMBtrans2",reply_trans2, AS_USER | CAN_IPC },
1038 /* 0x33 */ { "SMBtranss2",reply_transs2, AS_USER},
1039 /* 0x34 */ { "SMBfindclose",reply_findclose,AS_USER},
1040 /* 0x35 */ { "SMBfindnclose",reply_findnclose,AS_USER},
1041 /* 0x36 */ { NULL, NULL, 0 },
1042 /* 0x37 */ { NULL, NULL, 0 },
1043 /* 0x38 */ { NULL, NULL, 0 },
1044 /* 0x39 */ { NULL, NULL, 0 },
1045 /* 0x3a */ { NULL, NULL, 0 },
1046 /* 0x3b */ { NULL, NULL, 0 },
1047 /* 0x3c */ { NULL, NULL, 0 },
1048 /* 0x3d */ { NULL, NULL, 0 },
1049 /* 0x3e */ { NULL, NULL, 0 },
1050 /* 0x3f */ { NULL, NULL, 0 },
1051 /* 0x40 */ { NULL, NULL, 0 },
1052 /* 0x41 */ { NULL, NULL, 0 },
1053 /* 0x42 */ { NULL, NULL, 0 },
1054 /* 0x43 */ { NULL, NULL, 0 },
1055 /* 0x44 */ { NULL, NULL, 0 },
1056 /* 0x45 */ { NULL, NULL, 0 },
1057 /* 0x46 */ { NULL, NULL, 0 },
1058 /* 0x47 */ { NULL, NULL, 0 },
1059 /* 0x48 */ { NULL, NULL, 0 },
1060 /* 0x49 */ { NULL, NULL, 0 },
1061 /* 0x4a */ { NULL, NULL, 0 },
1062 /* 0x4b */ { NULL, NULL, 0 },
1063 /* 0x4c */ { NULL, NULL, 0 },
1064 /* 0x4d */ { NULL, NULL, 0 },
1065 /* 0x4e */ { NULL, NULL, 0 },
1066 /* 0x4f */ { NULL, NULL, 0 },
1067 /* 0x50 */ { NULL, NULL, 0 },
1068 /* 0x51 */ { NULL, NULL, 0 },
1069 /* 0x52 */ { NULL, NULL, 0 },
1070 /* 0x53 */ { NULL, NULL, 0 },
1071 /* 0x54 */ { NULL, NULL, 0 },
1072 /* 0x55 */ { NULL, NULL, 0 },
1073 /* 0x56 */ { NULL, NULL, 0 },
1074 /* 0x57 */ { NULL, NULL, 0 },
1075 /* 0x58 */ { NULL, NULL, 0 },
1076 /* 0x59 */ { NULL, NULL, 0 },
1077 /* 0x5a */ { NULL, NULL, 0 },
1078 /* 0x5b */ { NULL, NULL, 0 },
1079 /* 0x5c */ { NULL, NULL, 0 },
1080 /* 0x5d */ { NULL, NULL, 0 },
1081 /* 0x5e */ { NULL, NULL, 0 },
1082 /* 0x5f */ { NULL, NULL, 0 },
1083 /* 0x60 */ { NULL, NULL, 0 },
1084 /* 0x61 */ { NULL, NULL, 0 },
1085 /* 0x62 */ { NULL, NULL, 0 },
1086 /* 0x63 */ { NULL, NULL, 0 },
1087 /* 0x64 */ { NULL, NULL, 0 },
1088 /* 0x65 */ { NULL, NULL, 0 },
1089 /* 0x66 */ { NULL, NULL, 0 },
1090 /* 0x67 */ { NULL, NULL, 0 },
1091 /* 0x68 */ { NULL, NULL, 0 },
1092 /* 0x69 */ { NULL, NULL, 0 },
1093 /* 0x6a */ { NULL, NULL, 0 },
1094 /* 0x6b */ { NULL, NULL, 0 },
1095 /* 0x6c */ { NULL, NULL, 0 },
1096 /* 0x6d */ { NULL, NULL, 0 },
1097 /* 0x6e */ { NULL, NULL, 0 },
1098 /* 0x6f */ { NULL, NULL, 0 },
1099 /* 0x70 */ { "SMBtcon",reply_tcon,0},
1100 /* 0x71 */ { "SMBtdis",reply_tdis,DO_CHDIR},
1101 /* 0x72 */ { "SMBnegprot",reply_negprot,0},
1102 /* 0x73 */ { "SMBsesssetupX",reply_sesssetup_and_X,0},
1103 /* 0x74 */ { "SMBulogoffX",reply_ulogoffX, 0}, /* ulogoff doesn't give a valid TID */
1104 /* 0x75 */ { "SMBtconX",reply_tcon_and_X,0},
1105 /* 0x76 */ { NULL, NULL, 0 },
1106 /* 0x77 */ { NULL, NULL, 0 },
1107 /* 0x78 */ { NULL, NULL, 0 },
1108 /* 0x79 */ { NULL, NULL, 0 },
1109 /* 0x7a */ { NULL, NULL, 0 },
1110 /* 0x7b */ { NULL, NULL, 0 },
1111 /* 0x7c */ { NULL, NULL, 0 },
1112 /* 0x7d */ { NULL, NULL, 0 },
1113 /* 0x7e */ { NULL, NULL, 0 },
1114 /* 0x7f */ { NULL, NULL, 0 },
1115 /* 0x80 */ { "SMBdskattr",reply_dskattr,AS_USER},
1116 /* 0x81 */ { "SMBsearch",reply_search,AS_USER},
1117 /* 0x82 */ { "SMBffirst",reply_search,AS_USER},
1118 /* 0x83 */ { "SMBfunique",reply_search,AS_USER},
1119 /* 0x84 */ { "SMBfclose",reply_fclose,AS_USER},
1120 /* 0x85 */ { NULL, NULL, 0 },
1121 /* 0x86 */ { NULL, NULL, 0 },
1122 /* 0x87 */ { NULL, NULL, 0 },
1123 /* 0x88 */ { NULL, NULL, 0 },
1124 /* 0x89 */ { NULL, NULL, 0 },
1125 /* 0x8a */ { NULL, NULL, 0 },
1126 /* 0x8b */ { NULL, NULL, 0 },
1127 /* 0x8c */ { NULL, NULL, 0 },
1128 /* 0x8d */ { NULL, NULL, 0 },
1129 /* 0x8e */ { NULL, NULL, 0 },
1130 /* 0x8f */ { NULL, NULL, 0 },
1131 /* 0x90 */ { NULL, NULL, 0 },
1132 /* 0x91 */ { NULL, NULL, 0 },
1133 /* 0x92 */ { NULL, NULL, 0 },
1134 /* 0x93 */ { NULL, NULL, 0 },
1135 /* 0x94 */ { NULL, NULL, 0 },
1136 /* 0x95 */ { NULL, NULL, 0 },
1137 /* 0x96 */ { NULL, NULL, 0 },
1138 /* 0x97 */ { NULL, NULL, 0 },
1139 /* 0x98 */ { NULL, NULL, 0 },
1140 /* 0x99 */ { NULL, NULL, 0 },
1141 /* 0x9a */ { NULL, NULL, 0 },
1142 /* 0x9b */ { NULL, NULL, 0 },
1143 /* 0x9c */ { NULL, NULL, 0 },
1144 /* 0x9d */ { NULL, NULL, 0 },
1145 /* 0x9e */ { NULL, NULL, 0 },
1146 /* 0x9f */ { NULL, NULL, 0 },
1147 /* 0xa0 */ { "SMBnttrans",reply_nttrans, AS_USER | CAN_IPC },
1148 /* 0xa1 */ { "SMBnttranss",reply_nttranss, AS_USER | CAN_IPC },
1149 /* 0xa2 */ { "SMBntcreateX",reply_ntcreate_and_X, AS_USER | CAN_IPC },
1150 /* 0xa3 */ { NULL, NULL, 0 },
1151 /* 0xa4 */ { "SMBntcancel",reply_ntcancel, 0 },
1152 /* 0xa5 */ { "SMBntrename",reply_ntrename, AS_USER | NEED_WRITE },
1153 /* 0xa6 */ { NULL, NULL, 0 },
1154 /* 0xa7 */ { NULL, NULL, 0 },
1155 /* 0xa8 */ { NULL, NULL, 0 },
1156 /* 0xa9 */ { NULL, NULL, 0 },
1157 /* 0xaa */ { NULL, NULL, 0 },
1158 /* 0xab */ { NULL, NULL, 0 },
1159 /* 0xac */ { NULL, NULL, 0 },
1160 /* 0xad */ { NULL, NULL, 0 },
1161 /* 0xae */ { NULL, NULL, 0 },
1162 /* 0xaf */ { NULL, NULL, 0 },
1163 /* 0xb0 */ { NULL, NULL, 0 },
1164 /* 0xb1 */ { NULL, NULL, 0 },
1165 /* 0xb2 */ { NULL, NULL, 0 },
1166 /* 0xb3 */ { NULL, NULL, 0 },
1167 /* 0xb4 */ { NULL, NULL, 0 },
1168 /* 0xb5 */ { NULL, NULL, 0 },
1169 /* 0xb6 */ { NULL, NULL, 0 },
1170 /* 0xb7 */ { NULL, NULL, 0 },
1171 /* 0xb8 */ { NULL, NULL, 0 },
1172 /* 0xb9 */ { NULL, NULL, 0 },
1173 /* 0xba */ { NULL, NULL, 0 },
1174 /* 0xbb */ { NULL, NULL, 0 },
1175 /* 0xbc */ { NULL, NULL, 0 },
1176 /* 0xbd */ { NULL, NULL, 0 },
1177 /* 0xbe */ { NULL, NULL, 0 },
1178 /* 0xbf */ { NULL, NULL, 0 },
1179 /* 0xc0 */ { "SMBsplopen",reply_printopen,AS_USER},
1180 /* 0xc1 */ { "SMBsplwr",reply_printwrite,AS_USER},
1181 /* 0xc2 */ { "SMBsplclose",reply_printclose,AS_USER},
1182 /* 0xc3 */ { "SMBsplretq",reply_printqueue,AS_USER},
1183 /* 0xc4 */ { NULL, NULL, 0 },
1184 /* 0xc5 */ { NULL, NULL, 0 },
1185 /* 0xc6 */ { NULL, NULL, 0 },
1186 /* 0xc7 */ { NULL, NULL, 0 },
1187 /* 0xc8 */ { NULL, NULL, 0 },
1188 /* 0xc9 */ { NULL, NULL, 0 },
1189 /* 0xca */ { NULL, NULL, 0 },
1190 /* 0xcb */ { NULL, NULL, 0 },
1191 /* 0xcc */ { NULL, NULL, 0 },
1192 /* 0xcd */ { NULL, NULL, 0 },
1193 /* 0xce */ { NULL, NULL, 0 },
1194 /* 0xcf */ { NULL, NULL, 0 },
1195 /* 0xd0 */ { "SMBsends",reply_sends,AS_GUEST},
1196 /* 0xd1 */ { "SMBsendb", NULL,AS_GUEST},
1197 /* 0xd2 */ { "SMBfwdname", NULL,AS_GUEST},
1198 /* 0xd3 */ { "SMBcancelf", NULL,AS_GUEST},
1199 /* 0xd4 */ { "SMBgetmac", NULL,AS_GUEST},
1200 /* 0xd5 */ { "SMBsendstrt",reply_sendstrt,AS_GUEST},
1201 /* 0xd6 */ { "SMBsendend",reply_sendend,AS_GUEST},
1202 /* 0xd7 */ { "SMBsendtxt",reply_sendtxt,AS_GUEST},
1203 /* 0xd8 */ { NULL, NULL, 0 },
1204 /* 0xd9 */ { NULL, NULL, 0 },
1205 /* 0xda */ { NULL, NULL, 0 },
1206 /* 0xdb */ { NULL, NULL, 0 },
1207 /* 0xdc */ { NULL, NULL, 0 },
1208 /* 0xdd */ { NULL, NULL, 0 },
1209 /* 0xde */ { NULL, NULL, 0 },
1210 /* 0xdf */ { NULL, NULL, 0 },
1211 /* 0xe0 */ { NULL, NULL, 0 },
1212 /* 0xe1 */ { NULL, NULL, 0 },
1213 /* 0xe2 */ { NULL, NULL, 0 },
1214 /* 0xe3 */ { NULL, NULL, 0 },
1215 /* 0xe4 */ { NULL, NULL, 0 },
1216 /* 0xe5 */ { NULL, NULL, 0 },
1217 /* 0xe6 */ { NULL, NULL, 0 },
1218 /* 0xe7 */ { NULL, NULL, 0 },
1219 /* 0xe8 */ { NULL, NULL, 0 },
1220 /* 0xe9 */ { NULL, NULL, 0 },
1221 /* 0xea */ { NULL, NULL, 0 },
1222 /* 0xeb */ { NULL, NULL, 0 },
1223 /* 0xec */ { NULL, NULL, 0 },
1224 /* 0xed */ { NULL, NULL, 0 },
1225 /* 0xee */ { NULL, NULL, 0 },
1226 /* 0xef */ { NULL, NULL, 0 },
1227 /* 0xf0 */ { NULL, NULL, 0 },
1228 /* 0xf1 */ { NULL, NULL, 0 },
1229 /* 0xf2 */ { NULL, NULL, 0 },
1230 /* 0xf3 */ { NULL, NULL, 0 },
1231 /* 0xf4 */ { NULL, NULL, 0 },
1232 /* 0xf5 */ { NULL, NULL, 0 },
1233 /* 0xf6 */ { NULL, NULL, 0 },
1234 /* 0xf7 */ { NULL, NULL, 0 },
1235 /* 0xf8 */ { NULL, NULL, 0 },
1236 /* 0xf9 */ { NULL, NULL, 0 },
1237 /* 0xfa */ { NULL, NULL, 0 },
1238 /* 0xfb */ { NULL, NULL, 0 },
1239 /* 0xfc */ { NULL, NULL, 0 },
1240 /* 0xfd */ { NULL, NULL, 0 },
1241 /* 0xfe */ { NULL, NULL, 0 },
1242 /* 0xff */ { NULL, NULL, 0 }
1246 /*******************************************************************
1247 allocate and initialize a reply packet
1248 ********************************************************************/
1250 bool create_outbuf(TALLOC_CTX *mem_ctx, const char *inbuf, char **outbuf,
1251 uint8_t num_words, uint32_t num_bytes)
1254 * Protect against integer wrap
1256 if ((num_bytes > 0xffffff)
1257 || ((num_bytes + smb_size + num_words*2) > 0xffffff)) {
1259 if (asprintf(&msg, "num_bytes too large: %u",
1260 (unsigned)num_bytes) == -1) {
1261 msg = CONST_DISCARD(char *, "num_bytes too large");
1266 *outbuf = TALLOC_ARRAY(mem_ctx, char,
1267 smb_size + num_words*2 + num_bytes);
1268 if (*outbuf == NULL) {
1272 construct_reply_common(inbuf, *outbuf);
1273 srv_set_message(*outbuf, num_words, num_bytes, false);
1275 * Zero out the word area, the caller has to take care of the bcc area
1278 if (num_words != 0) {
1279 memset(*outbuf + smb_vwv0, 0, num_words*2);
1285 void reply_outbuf(struct smb_request *req, uint8 num_words, uint32 num_bytes)
1288 if (!create_outbuf(req, (char *)req->inbuf, &outbuf, num_words,
1290 smb_panic("could not allocate output buffer\n");
1292 req->outbuf = (uint8_t *)outbuf;
1296 /*******************************************************************
1297 Dump a packet to a file.
1298 ********************************************************************/
1300 static void smb_dump(const char *name, int type, const char *data, ssize_t len)
1304 if (DEBUGLEVEL < 50) {
1308 if (len < 4) len = smb_len(data)+4;
1309 for (i=1;i<100;i++) {
1310 if (asprintf(&fname, "/tmp/%s.%d.%s", name, i,
1311 type ? "req" : "resp") == -1) {
1314 fd = open(fname, O_WRONLY|O_CREAT|O_EXCL, 0644);
1315 if (fd != -1 || errno != EEXIST) break;
1318 ssize_t ret = write(fd, data, len);
1320 DEBUG(0,("smb_dump: problem: write returned %d\n", (int)ret ));
1322 DEBUG(0,("created %s len %lu\n", fname, (unsigned long)len));
1327 /****************************************************************************
1328 Prepare everything for calling the actual request function, and potentially
1329 call the request function via the "new" interface.
1331 Return False if the "legacy" function needs to be called, everything is
1334 Return True if we're done.
1336 I know this API sucks, but it is the one with the least code change I could
1338 ****************************************************************************/
1340 static connection_struct *switch_message(uint8 type, struct smb_request *req, int size)
1344 connection_struct *conn = NULL;
1346 static uint16 last_session_tag = UID_FIELD_INVALID;
1350 /* Make sure this is an SMB packet. smb_size contains NetBIOS header
1351 * so subtract 4 from it. */
1352 if (!valid_smb_header(req->inbuf)
1353 || (size < (smb_size - 4))) {
1354 DEBUG(2,("Non-SMB packet of length %d. Terminating server\n",
1355 smb_len(req->inbuf)));
1356 exit_server_cleanly("Non-SMB packet");
1359 if (smb_messages[type].fn == NULL) {
1360 DEBUG(0,("Unknown message type %d!\n",type));
1361 smb_dump("Unknown", 1, (char *)req->inbuf, size);
1362 reply_unknown_new(req, type);
1366 flags = smb_messages[type].flags;
1368 /* In share mode security we must ignore the vuid. */
1369 session_tag = (lp_security() == SEC_SHARE)
1370 ? UID_FIELD_INVALID : req->vuid;
1373 DEBUG(3,("switch message %s (pid %d) conn 0x%lx\n", smb_fn_name(type),
1374 (int)sys_getpid(), (unsigned long)conn));
1376 smb_dump(smb_fn_name(type), 1, (char *)req->inbuf, size);
1378 /* Ensure this value is replaced in the incoming packet. */
1379 SSVAL(req->inbuf,smb_uid,session_tag);
1382 * Ensure the correct username is in current_user_info. This is a
1383 * really ugly bugfix for problems with multiple session_setup_and_X's
1384 * being done and allowing %U and %G substitutions to work correctly.
1385 * There is a reason this code is done here, don't move it unless you
1386 * know what you're doing... :-).
1390 if (session_tag != last_session_tag) {
1391 user_struct *vuser = NULL;
1393 last_session_tag = session_tag;
1394 if(session_tag != UID_FIELD_INVALID) {
1395 vuser = get_valid_user_struct(session_tag);
1397 set_current_user_info(
1398 vuser->server_info->sanitized_username,
1399 vuser->server_info->unix_name,
1400 pdb_get_fullname(vuser->server_info
1402 pdb_get_domain(vuser->server_info
1408 /* Does this call need to be run as the connected user? */
1409 if (flags & AS_USER) {
1411 /* Does this call need a valid tree connection? */
1414 * Amazingly, the error code depends on the command
1417 if (type == SMBntcreateX) {
1418 reply_nterror(req, NT_STATUS_INVALID_HANDLE);
1420 reply_doserror(req, ERRSRV, ERRinvnid);
1425 if (!change_to_user(conn,session_tag)) {
1426 reply_nterror(req, NT_STATUS_DOS(ERRSRV, ERRbaduid));
1430 /* All NEED_WRITE and CAN_IPC flags must also have AS_USER. */
1432 /* Does it need write permission? */
1433 if ((flags & NEED_WRITE) && !CAN_WRITE(conn)) {
1434 reply_nterror(req, NT_STATUS_MEDIA_WRITE_PROTECTED);
1438 /* IPC services are limited */
1439 if (IS_IPC(conn) && !(flags & CAN_IPC)) {
1440 reply_doserror(req, ERRSRV,ERRaccess);
1444 /* This call needs to be run as root */
1445 change_to_root_user();
1448 /* load service specific parameters */
1450 if (req->encrypted) {
1451 conn->encrypted_tid = true;
1452 /* encrypted required from now on. */
1453 conn->encrypt_level = Required;
1454 } else if (ENCRYPTION_REQUIRED(conn)) {
1455 if (req->cmd != SMBtrans2 && req->cmd != SMBtranss2) {
1456 exit_server_cleanly("encryption required "
1462 if (!set_current_service(conn,SVAL(req->inbuf,smb_flg),
1463 (flags & (AS_USER|DO_CHDIR)
1465 reply_doserror(req, ERRSRV, ERRaccess);
1468 conn->num_smb_operations++;
1471 /* does this protocol need to be run as guest? */
1472 if ((flags & AS_GUEST)
1473 && (!change_to_guest() ||
1474 !check_access(smbd_server_fd(), lp_hostsallow(-1),
1475 lp_hostsdeny(-1)))) {
1476 reply_doserror(req, ERRSRV, ERRaccess);
1480 smb_messages[type].fn(req);
1484 /****************************************************************************
1485 Construct a reply to the incoming packet.
1486 ****************************************************************************/
1488 static void construct_reply(char *inbuf, int size, size_t unread_bytes, bool encrypted)
1490 connection_struct *conn;
1491 struct smb_request *req;
1495 if (!(req = talloc(talloc_tos(), struct smb_request))) {
1496 smb_panic("could not allocate smb_request");
1498 init_smb_request(req, (uint8 *)inbuf, unread_bytes, encrypted);
1500 conn = switch_message(req->cmd, req, size);
1502 if (req->unread_bytes) {
1503 /* writeX failed. drain socket. */
1504 if (drain_socket(smbd_server_fd(), req->unread_bytes) !=
1505 req->unread_bytes) {
1506 smb_panic("failed to drain pending bytes");
1508 req->unread_bytes = 0;
1511 if (req->outbuf == NULL) {
1515 if (CVAL(req->outbuf,0) == 0) {
1516 show_msg((char *)req->outbuf);
1519 if (!srv_send_smb(smbd_server_fd(),
1520 (char *)req->outbuf,
1521 IS_CONN_ENCRYPTED(conn)||req->encrypted)) {
1522 exit_server_cleanly("construct_reply: srv_send_smb failed.");
1530 /****************************************************************************
1531 Process an smb from the client
1532 ****************************************************************************/
1534 static void process_smb(char *inbuf, size_t nread, size_t unread_bytes, bool encrypted)
1536 static int trans_num;
1537 int msg_type = CVAL(inbuf,0);
1539 DO_PROFILE_INC(smb_count);
1541 DEBUG( 6, ( "got message type 0x%x of len 0x%x\n", msg_type,
1543 DEBUG( 3, ( "Transaction %d of length %d (%u toread)\n", trans_num,
1545 (unsigned int)unread_bytes ));
1547 if (msg_type != 0) {
1549 * NetBIOS session request, keepalive, etc.
1551 reply_special(inbuf);
1557 construct_reply(inbuf,nread,unread_bytes,encrypted);
1562 /****************************************************************************
1563 Return a string containing the function name of a SMB command.
1564 ****************************************************************************/
1566 const char *smb_fn_name(int type)
1568 const char *unknown_name = "SMBunknown";
1570 if (smb_messages[type].name == NULL)
1571 return(unknown_name);
1573 return(smb_messages[type].name);
1576 /****************************************************************************
1577 Helper functions for contruct_reply.
1578 ****************************************************************************/
1580 static uint32 common_flags2 = FLAGS2_LONG_PATH_COMPONENTS|FLAGS2_32_BIT_ERROR_CODES;
1582 void add_to_common_flags2(uint32 v)
1587 void remove_from_common_flags2(uint32 v)
1589 common_flags2 &= ~v;
1592 void construct_reply_common(const char *inbuf, char *outbuf)
1594 srv_set_message(outbuf,0,0,false);
1596 SCVAL(outbuf,smb_com,CVAL(inbuf,smb_com));
1597 SIVAL(outbuf,smb_rcls,0);
1598 SCVAL(outbuf,smb_flg, FLAG_REPLY | (CVAL(inbuf,smb_flg) & FLAG_CASELESS_PATHNAMES));
1599 SSVAL(outbuf,smb_flg2,
1600 (SVAL(inbuf,smb_flg2) & FLAGS2_UNICODE_STRINGS) |
1602 memset(outbuf+smb_pidhigh,'\0',(smb_tid-smb_pidhigh));
1604 SSVAL(outbuf,smb_tid,SVAL(inbuf,smb_tid));
1605 SSVAL(outbuf,smb_pid,SVAL(inbuf,smb_pid));
1606 SSVAL(outbuf,smb_uid,SVAL(inbuf,smb_uid));
1607 SSVAL(outbuf,smb_mid,SVAL(inbuf,smb_mid));
1610 /****************************************************************************
1611 Construct a chained reply and add it to the already made reply
1612 ****************************************************************************/
1614 void chain_reply(struct smb_request *req)
1616 static char *orig_inbuf;
1619 * Dirty little const_discard: We mess with req->inbuf, which is
1620 * declared as const. If maybe at some point this routine gets
1621 * rewritten, this const_discard could go away.
1623 char *inbuf = CONST_DISCARD(char *, req->inbuf);
1624 int size = smb_len(req->inbuf)+4;
1626 int smb_com1, smb_com2 = CVAL(inbuf,smb_vwv0);
1627 unsigned smb_off2 = SVAL(inbuf,smb_vwv1);
1631 char inbuf_saved[smb_wct];
1632 char *outbuf = (char *)req->outbuf;
1633 size_t outsize = smb_len(outbuf) + 4;
1634 size_t outsize_padded;
1636 size_t ofs, to_move;
1638 struct smb_request *req2;
1639 size_t caller_outputlen;
1640 char *caller_output;
1642 /* Maybe its not chained, or it's an error packet. */
1643 if (smb_com2 == 0xFF || SVAL(outbuf,smb_rcls) != 0) {
1644 SCVAL(outbuf,smb_vwv0,0xFF);
1648 if (chain_size == 0) {
1649 /* this is the first part of the chain */
1654 * We need to save the output the caller added to the chain so that we
1655 * can splice it into the final output buffer later.
1658 caller_outputlen = outsize - smb_wct;
1660 caller_output = (char *)memdup(outbuf + smb_wct, caller_outputlen);
1662 if (caller_output == NULL) {
1663 /* TODO: NT_STATUS_NO_MEMORY */
1664 smb_panic("could not dup outbuf");
1668 * The original Win95 redirector dies on a reply to
1669 * a lockingX and read chain unless the chain reply is
1670 * 4 byte aligned. JRA.
1673 outsize_padded = (outsize + 3) & ~3;
1674 padding = outsize_padded - outsize;
1677 * remember how much the caller added to the chain, only counting
1678 * stuff after the parameter words
1680 chain_size += (outsize_padded - smb_wct);
1683 * work out pointers into the original packets. The
1684 * headers on these need to be filled in
1686 inbuf2 = orig_inbuf + smb_off2 + 4 - smb_wct;
1688 /* remember the original command type */
1689 smb_com1 = CVAL(orig_inbuf,smb_com);
1691 /* save the data which will be overwritten by the new headers */
1692 memcpy(inbuf_saved,inbuf2,smb_wct);
1694 /* give the new packet the same header as the last part of the SMB */
1695 memmove(inbuf2,inbuf,smb_wct);
1697 /* create the in buffer */
1698 SCVAL(inbuf2,smb_com,smb_com2);
1700 /* work out the new size for the in buffer. */
1701 new_size = size - (inbuf2 - inbuf);
1703 DEBUG(0,("chain_reply: chain packet size incorrect "
1704 "(orig size = %d, offset = %d)\n",
1705 size, (int)(inbuf2 - inbuf) ));
1706 exit_server_cleanly("Bad chained packet");
1710 /* And set it in the header. */
1711 smb_setlen(inbuf2, new_size - 4);
1713 DEBUG(3,("Chained message\n"));
1716 if (!(req2 = talloc(talloc_tos(), struct smb_request))) {
1717 smb_panic("could not allocate smb_request");
1719 init_smb_request(req2, (uint8 *)inbuf2,0, req->encrypted);
1720 req2->chain_fsp = req->chain_fsp;
1722 /* process the request */
1723 switch_message(smb_com2, req2, new_size);
1726 * We don't accept deferred operations in chained requests.
1728 SMB_ASSERT(req2->outbuf != NULL);
1729 outsize2 = smb_len(req2->outbuf)+4;
1732 * Move away the new command output so that caller_output fits in,
1733 * copy in the caller_output saved above.
1736 SMB_ASSERT(outsize_padded >= smb_wct);
1739 * "ofs" is the space we need for caller_output. Equal to
1740 * caller_outputlen plus the padding.
1743 ofs = outsize_padded - smb_wct;
1746 * "to_move" is the amount of bytes the secondary routine gave us
1749 to_move = outsize2 - smb_wct;
1751 if (to_move + ofs + smb_wct + chain_size > max_send) {
1752 smb_panic("replies too large -- would have to cut");
1756 * In the "new" API "outbuf" is allocated via reply_outbuf, just for
1757 * the first request in the chain. So we have to re-allocate it. In
1758 * the "old" API the only outbuf ever used is the global OutBuffer
1759 * which is always large enough.
1762 outbuf = TALLOC_REALLOC_ARRAY(NULL, outbuf, char,
1763 to_move + ofs + smb_wct);
1764 if (outbuf == NULL) {
1765 smb_panic("could not realloc outbuf");
1768 req->outbuf = (uint8 *)outbuf;
1770 memmove(outbuf + smb_wct + ofs, req2->outbuf + smb_wct, to_move);
1771 memcpy(outbuf + smb_wct, caller_output, caller_outputlen);
1774 * copy the new reply header over the old one but preserve the smb_com
1777 memmove(outbuf, req2->outbuf, smb_wct);
1778 SCVAL(outbuf, smb_com, smb_com1);
1781 * We've just copied in the whole "wct" area from the secondary
1782 * function. Fix up the chaining: com2 and the offset need to be
1786 SCVAL(outbuf, smb_vwv0, smb_com2);
1787 SSVAL(outbuf, smb_vwv1, chain_size + smb_wct - 4);
1792 * Due to padding we have some uninitialized bytes after the
1796 memset(outbuf + outsize, 0, padding);
1799 smb_setlen(outbuf, outsize2 + caller_outputlen + padding - 4);
1802 * restore the saved data, being careful not to overwrite any data
1803 * from the reply header
1805 memcpy(inbuf2,inbuf_saved,smb_wct);
1807 SAFE_FREE(caller_output);
1811 * Reset the chain_size for our caller's offset calculations
1814 chain_size -= (outsize_padded - smb_wct);
1819 /****************************************************************************
1820 Check if services need reloading.
1821 ****************************************************************************/
1823 void check_reload(time_t t)
1825 static pid_t mypid = 0;
1826 static time_t last_smb_conf_reload_time = 0;
1827 static time_t last_printer_reload_time = 0;
1828 time_t printcap_cache_time = (time_t)lp_printcap_cache_time();
1830 if(last_smb_conf_reload_time == 0) {
1831 last_smb_conf_reload_time = t;
1832 /* Our printing subsystem might not be ready at smbd start up.
1833 Then no printer is available till the first printers check
1834 is performed. A lower initial interval circumvents this. */
1835 if ( printcap_cache_time > 60 )
1836 last_printer_reload_time = t - printcap_cache_time + 60;
1838 last_printer_reload_time = t;
1841 if (mypid != getpid()) { /* First time or fork happened meanwhile */
1842 /* randomize over 60 second the printcap reload to avoid all
1843 * process hitting cupsd at the same time */
1844 int time_range = 60;
1846 last_printer_reload_time += random() % time_range;
1850 if (reload_after_sighup || (t >= last_smb_conf_reload_time+SMBD_RELOAD_CHECK)) {
1851 reload_services(True);
1852 reload_after_sighup = False;
1853 last_smb_conf_reload_time = t;
1856 /* 'printcap cache time = 0' disable the feature */
1858 if ( printcap_cache_time != 0 )
1860 /* see if it's time to reload or if the clock has been set back */
1862 if ( (t >= last_printer_reload_time+printcap_cache_time)
1863 || (t-last_printer_reload_time < 0) )
1865 DEBUG( 3,( "Printcap cache time expired.\n"));
1867 last_printer_reload_time = t;
1872 /****************************************************************************
1873 Process commands from the client
1874 ****************************************************************************/
1876 void smbd_process(void)
1878 unsigned int num_smbs = 0;
1879 size_t unread_bytes = 0;
1881 char addr[INET6_ADDRSTRLEN];
1884 * Before the first packet, check the global hosts allow/ hosts deny
1885 * parameters before doing any parsing of packets passed to us by the
1886 * client. This prevents attacks on our parsing code from hosts not in
1887 * the hosts allow list.
1890 if (!check_access(smbd_server_fd(), lp_hostsallow(-1),
1891 lp_hostsdeny(-1))) {
1893 * send a negative session response "not listening on calling
1896 unsigned char buf[5] = {0x83, 0, 0, 1, 0x81};
1897 DEBUG( 1, ("Connection denied from %s\n",
1898 client_addr(get_client_fd(),addr,sizeof(addr)) ) );
1899 (void)srv_send_smb(smbd_server_fd(),(char *)buf,false);
1900 exit_server_cleanly("connection denied");
1903 max_recv = MIN(lp_maxxmit(),BUFFER_SIZE);
1908 size_t inbuf_len = 0;
1909 bool encrypted = false;
1910 TALLOC_CTX *frame = talloc_stackframe_pool(8192);
1914 run_events(smbd_event_context(), 0, NULL, NULL);
1916 status = receive_message_or_smb(
1917 talloc_tos(), &inbuf, &inbuf_len,
1918 &unread_bytes, &encrypted);
1920 if (!NT_STATUS_IS_OK(status)) {
1921 DEBUG(3, ("receive_message_or_smb failed: %s, "
1922 "exiting\n", nt_errstr(status)));
1926 process_smb(inbuf, inbuf_len, unread_bytes, encrypted);
1932 /* The timeout_processing function isn't run nearly
1933 often enough to implement 'max log size' without
1934 overrunning the size of the file by many megabytes.
1935 This is especially true if we are running at debug
1936 level 10. Checking every 50 SMBs is a nice
1937 tradeoff of performance vs log file size overrun. */
1939 if ((num_smbs % 50) == 0 && need_to_check_log_size()) {
1940 change_to_root_user();