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/>.
22 #include "smbd/globals.h"
24 extern bool global_machine_password_needs_changing;
26 static void construct_reply_common(struct smb_request *req, const char *inbuf,
29 /* Accessor function for smb_read_error for smbd functions. */
31 /****************************************************************************
33 ****************************************************************************/
35 bool srv_send_smb(int fd, char *buffer, bool do_encrypt)
40 char *buf_out = buffer;
42 /* Sign the outgoing packet if required. */
43 srv_calculate_sign_mac(buf_out);
46 NTSTATUS status = srv_encrypt_buffer(buffer, &buf_out);
47 if (!NT_STATUS_IS_OK(status)) {
48 DEBUG(0, ("send_smb: SMB encryption failed "
49 "on outgoing packet! Error %s\n",
55 len = smb_len(buf_out) + 4;
57 while (nwritten < len) {
58 ret = write_data(fd,buf_out+nwritten,len - nwritten);
60 DEBUG(0,("Error writing %d bytes to client. %d. (%s)\n",
61 (int)len,(int)ret, strerror(errno) ));
62 srv_free_enc_buffer(buf_out);
68 srv_free_enc_buffer(buf_out);
72 /*******************************************************************
73 Setup the word count and byte count for a smb message.
74 ********************************************************************/
76 int srv_set_message(char *buf,
81 if (zero && (num_words || num_bytes)) {
82 memset(buf + smb_size,'\0',num_words*2 + num_bytes);
84 SCVAL(buf,smb_wct,num_words);
85 SSVAL(buf,smb_vwv + num_words*SIZEOFWORD,num_bytes);
86 smb_setlen(buf,(smb_size + num_words*2 + num_bytes - 4));
87 return (smb_size + num_words*2 + num_bytes);
90 static bool valid_smb_header(const uint8_t *inbuf)
92 if (is_encrypted_packet(inbuf)) {
96 * This used to be (strncmp(smb_base(inbuf),"\377SMB",4) == 0)
97 * but it just looks weird to call strncmp for this one.
99 return (IVAL(smb_base(inbuf), 0) == 0x424D53FF);
102 /* Socket functions for smbd packet processing. */
104 static bool valid_packet_size(size_t len)
107 * A WRITEX with CAP_LARGE_WRITEX can be 64k worth of data plus 65 bytes
108 * of header. Don't print the error if this fits.... JRA.
111 if (len > (BUFFER_SIZE + LARGE_WRITEX_HDR_SIZE)) {
112 DEBUG(0,("Invalid packet length! (%lu bytes).\n",
113 (unsigned long)len));
119 static NTSTATUS read_packet_remainder(int fd, char *buffer,
120 unsigned int timeout, ssize_t len)
126 return read_socket_with_timeout(fd, buffer, len, len, timeout, NULL);
129 /****************************************************************************
130 Attempt a zerocopy writeX read. We know here that len > smb_size-4
131 ****************************************************************************/
134 * Unfortunately, earlier versions of smbclient/libsmbclient
135 * don't send this "standard" writeX header. I've fixed this
136 * for 3.2 but we'll use the old method with earlier versions.
137 * Windows and CIFSFS at least use this standard size. Not
141 #define STANDARD_WRITE_AND_X_HEADER_SIZE (smb_size - 4 + /* basic header */ \
142 (2*14) + /* word count (including bcc) */ \
145 static NTSTATUS receive_smb_raw_talloc_partial_read(TALLOC_CTX *mem_ctx,
146 const char lenbuf[4],
147 int fd, char **buffer,
148 unsigned int timeout,
152 /* Size of a WRITEX call (+4 byte len). */
153 char writeX_header[4 + STANDARD_WRITE_AND_X_HEADER_SIZE];
154 ssize_t len = smb_len_large(lenbuf); /* Could be a UNIX large writeX. */
158 memcpy(writeX_header, lenbuf, 4);
160 status = read_socket_with_timeout(
161 fd, writeX_header + 4,
162 STANDARD_WRITE_AND_X_HEADER_SIZE,
163 STANDARD_WRITE_AND_X_HEADER_SIZE,
166 if (!NT_STATUS_IS_OK(status)) {
171 * Ok - now try and see if this is a possible
175 if (is_valid_writeX_buffer((uint8_t *)writeX_header)) {
177 * If the data offset is beyond what
178 * we've read, drain the extra bytes.
180 uint16_t doff = SVAL(writeX_header,smb_vwv11);
183 if (doff > STANDARD_WRITE_AND_X_HEADER_SIZE) {
184 size_t drain = doff - STANDARD_WRITE_AND_X_HEADER_SIZE;
185 if (drain_socket(smbd_server_fd(), drain) != drain) {
186 smb_panic("receive_smb_raw_talloc_partial_read:"
187 " failed to drain pending bytes");
190 doff = STANDARD_WRITE_AND_X_HEADER_SIZE;
193 /* Spoof down the length and null out the bcc. */
194 set_message_bcc(writeX_header, 0);
195 newlen = smb_len(writeX_header);
197 /* Copy the header we've written. */
199 *buffer = (char *)TALLOC_MEMDUP(mem_ctx,
201 sizeof(writeX_header));
203 if (*buffer == NULL) {
204 DEBUG(0, ("Could not allocate inbuf of length %d\n",
205 (int)sizeof(writeX_header)));
206 return NT_STATUS_NO_MEMORY;
209 /* Work out the remaining bytes. */
210 *p_unread = len - STANDARD_WRITE_AND_X_HEADER_SIZE;
211 *len_ret = newlen + 4;
215 if (!valid_packet_size(len)) {
216 return NT_STATUS_INVALID_PARAMETER;
220 * Not a valid writeX call. Just do the standard
224 *buffer = TALLOC_ARRAY(mem_ctx, char, len+4);
226 if (*buffer == NULL) {
227 DEBUG(0, ("Could not allocate inbuf of length %d\n",
229 return NT_STATUS_NO_MEMORY;
232 /* Copy in what we already read. */
235 4 + STANDARD_WRITE_AND_X_HEADER_SIZE);
236 toread = len - STANDARD_WRITE_AND_X_HEADER_SIZE;
239 status = read_packet_remainder(
240 fd, (*buffer) + 4 + STANDARD_WRITE_AND_X_HEADER_SIZE,
243 if (!NT_STATUS_IS_OK(status)) {
244 DEBUG(10, ("receive_smb_raw_talloc_partial_read: %s\n",
254 static NTSTATUS receive_smb_raw_talloc(TALLOC_CTX *mem_ctx, int fd,
255 char **buffer, unsigned int timeout,
256 size_t *p_unread, size_t *plen)
260 int min_recv_size = lp_min_receive_file_size();
265 status = read_smb_length_return_keepalive(fd, lenbuf, timeout, &len);
266 if (!NT_STATUS_IS_OK(status)) {
267 DEBUG(10, ("receive_smb_raw: %s\n", nt_errstr(status)));
271 if (CVAL(lenbuf,0) == 0 &&
273 smb_len_large(lenbuf) > (min_recv_size + STANDARD_WRITE_AND_X_HEADER_SIZE) && /* Could be a UNIX large writeX. */
274 !srv_is_signing_active()) {
276 return receive_smb_raw_talloc_partial_read(
277 mem_ctx, lenbuf, fd, buffer, timeout, p_unread, plen);
280 if (!valid_packet_size(len)) {
281 return NT_STATUS_INVALID_PARAMETER;
285 * The +4 here can't wrap, we've checked the length above already.
288 *buffer = TALLOC_ARRAY(mem_ctx, char, len+4);
290 if (*buffer == NULL) {
291 DEBUG(0, ("Could not allocate inbuf of length %d\n",
293 return NT_STATUS_NO_MEMORY;
296 memcpy(*buffer, lenbuf, sizeof(lenbuf));
298 status = read_packet_remainder(fd, (*buffer)+4, timeout, len);
299 if (!NT_STATUS_IS_OK(status)) {
307 static NTSTATUS receive_smb_talloc(TALLOC_CTX *mem_ctx, int fd,
308 char **buffer, unsigned int timeout,
309 size_t *p_unread, bool *p_encrypted,
315 *p_encrypted = false;
317 status = receive_smb_raw_talloc(mem_ctx, fd, buffer, timeout,
319 if (!NT_STATUS_IS_OK(status)) {
323 if (is_encrypted_packet((uint8_t *)*buffer)) {
324 status = srv_decrypt_buffer(*buffer);
325 if (!NT_STATUS_IS_OK(status)) {
326 DEBUG(0, ("receive_smb_talloc: SMB decryption failed on "
327 "incoming packet! Error %s\n",
328 nt_errstr(status) ));
334 /* Check the incoming SMB signature. */
335 if (!srv_check_sign_mac(*buffer, true)) {
336 DEBUG(0, ("receive_smb: SMB Signature verification failed on "
337 "incoming packet!\n"));
338 return NT_STATUS_INVALID_NETWORK_RESPONSE;
346 * Initialize a struct smb_request from an inbuf
349 void init_smb_request(struct smb_request *req,
354 size_t req_size = smb_len(inbuf) + 4;
355 /* Ensure we have at least smb_size bytes. */
356 if (req_size < smb_size) {
357 DEBUG(0,("init_smb_request: invalid request size %u\n",
358 (unsigned int)req_size ));
359 exit_server_cleanly("Invalid SMB request");
361 req->cmd = CVAL(inbuf, smb_com);
362 req->flags2 = SVAL(inbuf, smb_flg2);
363 req->smbpid = SVAL(inbuf, smb_pid);
364 req->mid = SVAL(inbuf, smb_mid);
365 req->vuid = SVAL(inbuf, smb_uid);
366 req->tid = SVAL(inbuf, smb_tid);
367 req->wct = CVAL(inbuf, smb_wct);
368 req->vwv = (uint16_t *)(inbuf+smb_vwv);
369 req->buflen = smb_buflen(inbuf);
370 req->buf = (const uint8_t *)smb_buf(inbuf);
371 req->unread_bytes = unread_bytes;
372 req->encrypted = encrypted;
373 req->conn = conn_find(req->tid);
374 req->chain_fsp = NULL;
375 req->chain_outbuf = NULL;
377 /* Ensure we have at least wct words and 2 bytes of bcc. */
378 if (smb_size + req->wct*2 > req_size) {
379 DEBUG(0,("init_smb_request: invalid wct number %u (size %u)\n",
380 (unsigned int)req->wct,
381 (unsigned int)req_size));
382 exit_server_cleanly("Invalid SMB request");
384 /* Ensure bcc is correct. */
385 if (((uint8 *)smb_buf(inbuf)) + req->buflen > inbuf + req_size) {
386 DEBUG(0,("init_smb_request: invalid bcc number %u "
387 "(wct = %u, size %u)\n",
388 (unsigned int)req->buflen,
389 (unsigned int)req->wct,
390 (unsigned int)req_size));
391 exit_server_cleanly("Invalid SMB request");
396 static void process_smb(struct smbd_server_connection *conn,
397 uint8_t *inbuf, size_t nread, size_t unread_bytes,
400 static void smbd_deferred_open_timer(struct event_context *ev,
401 struct timed_event *te,
402 struct timeval _tval,
405 struct pending_message_list *msg = talloc_get_type(private_data,
406 struct pending_message_list);
407 TALLOC_CTX *mem_ctx = talloc_tos();
410 inbuf = (uint8_t *)talloc_memdup(mem_ctx, msg->buf.data,
413 exit_server("smbd_deferred_open_timer: talloc failed\n");
417 /* We leave this message on the queue so the open code can
418 know this is a retry. */
419 DEBUG(5,("smbd_deferred_open_timer: trigger mid %u.\n",
420 (unsigned int)SVAL(msg->buf.data,smb_mid)));
422 process_smb(smbd_server_conn, inbuf,
427 /****************************************************************************
428 Function to push a message onto the tail of a linked list of smb messages ready
430 ****************************************************************************/
432 static bool push_queued_message(struct smb_request *req,
433 struct timeval request_time,
434 struct timeval end_time,
435 char *private_data, size_t private_len)
437 int msg_len = smb_len(req->inbuf) + 4;
438 struct pending_message_list *msg;
440 msg = TALLOC_ZERO_P(NULL, struct pending_message_list);
443 DEBUG(0,("push_message: malloc fail (1)\n"));
447 msg->buf = data_blob_talloc(msg, req->inbuf, msg_len);
448 if(msg->buf.data == NULL) {
449 DEBUG(0,("push_message: malloc fail (2)\n"));
454 msg->request_time = request_time;
455 msg->encrypted = req->encrypted;
458 msg->private_data = data_blob_talloc(msg, private_data,
460 if (msg->private_data.data == NULL) {
461 DEBUG(0,("push_message: malloc fail (3)\n"));
467 msg->te = event_add_timed(smbd_event_context(),
470 smbd_deferred_open_timer,
473 DEBUG(0,("push_message: event_add_timed failed\n"));
478 DLIST_ADD_END(deferred_open_queue, msg, struct pending_message_list *);
480 DEBUG(10,("push_message: pushed message length %u on "
481 "deferred_open_queue\n", (unsigned int)msg_len));
486 /****************************************************************************
487 Function to delete a sharing violation open message by mid.
488 ****************************************************************************/
490 void remove_deferred_open_smb_message(uint16 mid)
492 struct pending_message_list *pml;
494 for (pml = deferred_open_queue; pml; pml = pml->next) {
495 if (mid == SVAL(pml->buf.data,smb_mid)) {
496 DEBUG(10,("remove_sharing_violation_open_smb_message: "
497 "deleting mid %u len %u\n",
499 (unsigned int)pml->buf.length ));
500 DLIST_REMOVE(deferred_open_queue, pml);
507 /****************************************************************************
508 Move a sharing violation open retry message to the front of the list and
509 schedule it for immediate processing.
510 ****************************************************************************/
512 void schedule_deferred_open_smb_message(uint16 mid)
514 struct pending_message_list *pml;
517 for (pml = deferred_open_queue; pml; pml = pml->next) {
518 uint16 msg_mid = SVAL(pml->buf.data,smb_mid);
520 DEBUG(10,("schedule_deferred_open_smb_message: [%d] msg_mid = %u\n", i++,
521 (unsigned int)msg_mid ));
523 if (mid == msg_mid) {
524 struct timed_event *te;
526 DEBUG(10,("schedule_deferred_open_smb_message: scheduling mid %u\n",
529 te = event_add_timed(smbd_event_context(),
532 smbd_deferred_open_timer,
535 DEBUG(10,("schedule_deferred_open_smb_message: "
536 "event_add_timed() failed, skipping mid %u\n",
540 TALLOC_FREE(pml->te);
542 DLIST_PROMOTE(deferred_open_queue, pml);
547 DEBUG(10,("schedule_deferred_open_smb_message: failed to find message mid %u\n",
551 /****************************************************************************
552 Return true if this mid is on the deferred queue.
553 ****************************************************************************/
555 bool open_was_deferred(uint16 mid)
557 struct pending_message_list *pml;
559 for (pml = deferred_open_queue; pml; pml = pml->next) {
560 if (SVAL(pml->buf.data,smb_mid) == mid) {
567 /****************************************************************************
568 Return the message queued by this mid.
569 ****************************************************************************/
571 struct pending_message_list *get_open_deferred_message(uint16 mid)
573 struct pending_message_list *pml;
575 for (pml = deferred_open_queue; pml; pml = pml->next) {
576 if (SVAL(pml->buf.data,smb_mid) == mid) {
583 /****************************************************************************
584 Function to push a deferred open smb message onto a linked list of local smb
585 messages ready for processing.
586 ****************************************************************************/
588 bool push_deferred_smb_message(struct smb_request *req,
589 struct timeval request_time,
590 struct timeval timeout,
591 char *private_data, size_t priv_len)
593 struct timeval end_time;
595 if (req->unread_bytes) {
596 DEBUG(0,("push_deferred_smb_message: logic error ! "
597 "unread_bytes = %u\n",
598 (unsigned int)req->unread_bytes ));
599 smb_panic("push_deferred_smb_message: "
600 "logic error unread_bytes != 0" );
603 end_time = timeval_sum(&request_time, &timeout);
605 DEBUG(10,("push_deferred_open_smb_message: pushing message len %u mid %u "
606 "timeout time [%u.%06u]\n",
607 (unsigned int) smb_len(req->inbuf)+4, (unsigned int)req->mid,
608 (unsigned int)end_time.tv_sec,
609 (unsigned int)end_time.tv_usec));
611 return push_queued_message(req, request_time, end_time,
612 private_data, priv_len);
616 struct timed_event *te;
617 struct timeval interval;
619 bool (*handler)(const struct timeval *now, void *private_data);
623 static void smbd_idle_event_handler(struct event_context *ctx,
624 struct timed_event *te,
628 struct idle_event *event =
629 talloc_get_type_abort(private_data, struct idle_event);
631 TALLOC_FREE(event->te);
633 DEBUG(10,("smbd_idle_event_handler: %s %p called\n",
634 event->name, event->te));
636 if (!event->handler(&now, event->private_data)) {
637 DEBUG(10,("smbd_idle_event_handler: %s %p stopped\n",
638 event->name, event->te));
639 /* Don't repeat, delete ourselves */
644 DEBUG(10,("smbd_idle_event_handler: %s %p rescheduled\n",
645 event->name, event->te));
647 event->te = event_add_timed(ctx, event,
648 timeval_sum(&now, &event->interval),
649 smbd_idle_event_handler, event);
651 /* We can't do much but fail here. */
652 SMB_ASSERT(event->te != NULL);
655 struct idle_event *event_add_idle(struct event_context *event_ctx,
657 struct timeval interval,
659 bool (*handler)(const struct timeval *now,
663 struct idle_event *result;
664 struct timeval now = timeval_current();
666 result = TALLOC_P(mem_ctx, struct idle_event);
667 if (result == NULL) {
668 DEBUG(0, ("talloc failed\n"));
672 result->interval = interval;
673 result->handler = handler;
674 result->private_data = private_data;
676 if (!(result->name = talloc_asprintf(result, "idle_evt(%s)", name))) {
677 DEBUG(0, ("talloc failed\n"));
682 result->te = event_add_timed(event_ctx, result,
683 timeval_sum(&now, &interval),
684 smbd_idle_event_handler, result);
685 if (result->te == NULL) {
686 DEBUG(0, ("event_add_timed failed\n"));
691 DEBUG(10,("event_add_idle: %s %p\n", result->name, result->te));
695 /****************************************************************************
696 Do all async processing in here. This includes kernel oplock messages, change
698 ****************************************************************************/
700 static void async_processing(void)
702 DEBUG(10,("async_processing: Doing async processing.\n"));
706 process_kernel_oplocks(smbd_messaging_context());
708 /* Do the aio check again after receive_local_message as it does a
709 select and may have eaten our signal. */
710 /* Is this till true? -- vl */
714 exit_server_cleanly("termination signal");
717 /* check for sighup processing */
718 if (reload_after_sighup) {
719 change_to_root_user();
720 DEBUG(1,("Reloading services after SIGHUP\n"));
721 reload_services(False);
722 reload_after_sighup = 0;
726 /****************************************************************************
727 Do a select on an two fd's - with timeout.
729 If a local udp message has been pushed onto the
730 queue (this can only happen during oplock break
731 processing) call async_processing()
733 If a pending smb message has been pushed onto the
734 queue (this can only happen during oplock break
735 processing) return this next.
737 If the first smbfd is ready then read an smb from it.
738 if the second (loopback UDP) fd is ready then read a message
739 from it and setup the buffer header to identify the length
741 Returns False on timeout or error.
744 The timeout is in milliseconds
745 ****************************************************************************/
747 static NTSTATUS smbd_server_connection_loop_once(struct smbd_server_connection *conn)
754 to.tv_sec = SMBD_SELECT_TIMEOUT;
758 * Setup the select fd sets.
765 * Ensure we process oplock break messages by preference.
766 * We have to do this before the select, after the select
767 * and if the select returns EINTR. This is due to the fact
768 * that the selects called from async_processing can eat an EINTR
769 * caused by a signal (we can't take the break message there).
770 * This is hideously complex - *MUST* be simplified for 3.0 ! JRA.
773 if (oplock_message_waiting()) {
774 DEBUG(10,("receive_message_or_smb: oplock_message is waiting.\n"));
777 * After async processing we must go and do the select again, as
778 * the state of the flag in fds for the server file descriptor is
779 * indeterminate - we may have done I/O on it in the oplock processing. JRA.
781 return NT_STATUS_RETRY;
785 * Are there any timed events waiting ? If so, ensure we don't
786 * select for longer than it would take to wait for them.
793 event_add_to_select_args(smbd_event_context(), &now,
794 &r_fds, &w_fds, &to, &maxfd);
797 /* Process a signal and timed events now... */
798 if (run_events(smbd_event_context(), 0, NULL, NULL)) {
799 return NT_STATUS_RETRY;
804 START_PROFILE(smbd_idle);
806 selrtn = sys_select(maxfd+1,&r_fds,&w_fds,NULL,&to);
809 END_PROFILE(smbd_idle);
813 if (run_events(smbd_event_context(), selrtn, &r_fds, &w_fds)) {
814 return NT_STATUS_RETRY;
817 /* if we get EINTR then maybe we have received an oplock
818 signal - treat this as select returning 1. This is ugly, but
819 is the best we can do until the oplock code knows more about
821 if (selrtn == -1 && errno == EINTR) {
824 * After async processing we must go and do the select again, as
825 * the state of the flag in fds for the server file descriptor is
826 * indeterminate - we may have done I/O on it in the oplock processing. JRA.
828 return NT_STATUS_RETRY;
833 /* something is wrong. Maybe the socket is dead? */
834 return map_nt_error_from_unix(errno);
837 /* Did we timeout ? */
839 return NT_STATUS_RETRY;
842 /* should not be reached */
843 return NT_STATUS_INTERNAL_ERROR;
847 * Only allow 5 outstanding trans requests. We're allocating memory, so
851 NTSTATUS allow_new_trans(struct trans_state *list, int mid)
854 for (; list != NULL; list = list->next) {
856 if (list->mid == mid) {
857 return NT_STATUS_INVALID_PARAMETER;
863 return NT_STATUS_INSUFFICIENT_RESOURCES;
869 /****************************************************************************
870 We're terminating and have closed all our files/connections etc.
871 If there are any pending local messages we need to respond to them
872 before termination so that other smbds don't think we just died whilst
874 ****************************************************************************/
876 void respond_to_all_remaining_local_messages(void)
879 * Assert we have no exclusive open oplocks.
882 if(get_number_of_exclusive_open_oplocks()) {
883 DEBUG(0,("respond_to_all_remaining_local_messages: PANIC : we have %d exclusive oplocks.\n",
884 get_number_of_exclusive_open_oplocks() ));
888 process_kernel_oplocks(smbd_messaging_context());
895 These flags determine some of the permissions required to do an operation
897 Note that I don't set NEED_WRITE on some write operations because they
898 are used by some brain-dead clients when printing, and I don't want to
899 force write permissions on print services.
901 #define AS_USER (1<<0)
902 #define NEED_WRITE (1<<1) /* Must be paired with AS_USER */
903 #define TIME_INIT (1<<2)
904 #define CAN_IPC (1<<3) /* Must be paired with AS_USER */
905 #define AS_GUEST (1<<5) /* Must *NOT* be paired with AS_USER */
906 #define DO_CHDIR (1<<6)
909 define a list of possible SMB messages and their corresponding
910 functions. Any message that has a NULL function is unimplemented -
911 please feel free to contribute implementations!
913 static const struct smb_message_struct {
915 void (*fn)(struct smb_request *req);
917 } smb_messages[256] = {
919 /* 0x00 */ { "SMBmkdir",reply_mkdir,AS_USER | NEED_WRITE},
920 /* 0x01 */ { "SMBrmdir",reply_rmdir,AS_USER | NEED_WRITE},
921 /* 0x02 */ { "SMBopen",reply_open,AS_USER },
922 /* 0x03 */ { "SMBcreate",reply_mknew,AS_USER},
923 /* 0x04 */ { "SMBclose",reply_close,AS_USER | CAN_IPC },
924 /* 0x05 */ { "SMBflush",reply_flush,AS_USER},
925 /* 0x06 */ { "SMBunlink",reply_unlink,AS_USER | NEED_WRITE },
926 /* 0x07 */ { "SMBmv",reply_mv,AS_USER | NEED_WRITE },
927 /* 0x08 */ { "SMBgetatr",reply_getatr,AS_USER},
928 /* 0x09 */ { "SMBsetatr",reply_setatr,AS_USER | NEED_WRITE},
929 /* 0x0a */ { "SMBread",reply_read,AS_USER},
930 /* 0x0b */ { "SMBwrite",reply_write,AS_USER | CAN_IPC },
931 /* 0x0c */ { "SMBlock",reply_lock,AS_USER},
932 /* 0x0d */ { "SMBunlock",reply_unlock,AS_USER},
933 /* 0x0e */ { "SMBctemp",reply_ctemp,AS_USER },
934 /* 0x0f */ { "SMBmknew",reply_mknew,AS_USER},
935 /* 0x10 */ { "SMBcheckpath",reply_checkpath,AS_USER},
936 /* 0x11 */ { "SMBexit",reply_exit,DO_CHDIR},
937 /* 0x12 */ { "SMBlseek",reply_lseek,AS_USER},
938 /* 0x13 */ { "SMBlockread",reply_lockread,AS_USER},
939 /* 0x14 */ { "SMBwriteunlock",reply_writeunlock,AS_USER},
940 /* 0x15 */ { NULL, NULL, 0 },
941 /* 0x16 */ { NULL, NULL, 0 },
942 /* 0x17 */ { NULL, NULL, 0 },
943 /* 0x18 */ { NULL, NULL, 0 },
944 /* 0x19 */ { NULL, NULL, 0 },
945 /* 0x1a */ { "SMBreadbraw",reply_readbraw,AS_USER},
946 /* 0x1b */ { "SMBreadBmpx",reply_readbmpx,AS_USER},
947 /* 0x1c */ { "SMBreadBs",reply_readbs,AS_USER },
948 /* 0x1d */ { "SMBwritebraw",reply_writebraw,AS_USER},
949 /* 0x1e */ { "SMBwriteBmpx",reply_writebmpx,AS_USER},
950 /* 0x1f */ { "SMBwriteBs",reply_writebs,AS_USER},
951 /* 0x20 */ { "SMBwritec", NULL,0},
952 /* 0x21 */ { NULL, NULL, 0 },
953 /* 0x22 */ { "SMBsetattrE",reply_setattrE,AS_USER | NEED_WRITE },
954 /* 0x23 */ { "SMBgetattrE",reply_getattrE,AS_USER },
955 /* 0x24 */ { "SMBlockingX",reply_lockingX,AS_USER },
956 /* 0x25 */ { "SMBtrans",reply_trans,AS_USER | CAN_IPC },
957 /* 0x26 */ { "SMBtranss",reply_transs,AS_USER | CAN_IPC},
958 /* 0x27 */ { "SMBioctl",reply_ioctl,0},
959 /* 0x28 */ { "SMBioctls", NULL,AS_USER},
960 /* 0x29 */ { "SMBcopy",reply_copy,AS_USER | NEED_WRITE },
961 /* 0x2a */ { "SMBmove", NULL,AS_USER | NEED_WRITE },
962 /* 0x2b */ { "SMBecho",reply_echo,0},
963 /* 0x2c */ { "SMBwriteclose",reply_writeclose,AS_USER},
964 /* 0x2d */ { "SMBopenX",reply_open_and_X,AS_USER | CAN_IPC },
965 /* 0x2e */ { "SMBreadX",reply_read_and_X,AS_USER | CAN_IPC },
966 /* 0x2f */ { "SMBwriteX",reply_write_and_X,AS_USER | CAN_IPC },
967 /* 0x30 */ { NULL, NULL, 0 },
968 /* 0x31 */ { NULL, NULL, 0 },
969 /* 0x32 */ { "SMBtrans2",reply_trans2, AS_USER | CAN_IPC },
970 /* 0x33 */ { "SMBtranss2",reply_transs2, AS_USER},
971 /* 0x34 */ { "SMBfindclose",reply_findclose,AS_USER},
972 /* 0x35 */ { "SMBfindnclose",reply_findnclose,AS_USER},
973 /* 0x36 */ { NULL, NULL, 0 },
974 /* 0x37 */ { NULL, NULL, 0 },
975 /* 0x38 */ { NULL, NULL, 0 },
976 /* 0x39 */ { NULL, NULL, 0 },
977 /* 0x3a */ { NULL, NULL, 0 },
978 /* 0x3b */ { NULL, NULL, 0 },
979 /* 0x3c */ { NULL, NULL, 0 },
980 /* 0x3d */ { NULL, NULL, 0 },
981 /* 0x3e */ { NULL, NULL, 0 },
982 /* 0x3f */ { NULL, NULL, 0 },
983 /* 0x40 */ { NULL, NULL, 0 },
984 /* 0x41 */ { NULL, NULL, 0 },
985 /* 0x42 */ { NULL, NULL, 0 },
986 /* 0x43 */ { NULL, NULL, 0 },
987 /* 0x44 */ { NULL, NULL, 0 },
988 /* 0x45 */ { NULL, NULL, 0 },
989 /* 0x46 */ { NULL, NULL, 0 },
990 /* 0x47 */ { NULL, NULL, 0 },
991 /* 0x48 */ { NULL, NULL, 0 },
992 /* 0x49 */ { NULL, NULL, 0 },
993 /* 0x4a */ { NULL, NULL, 0 },
994 /* 0x4b */ { NULL, NULL, 0 },
995 /* 0x4c */ { NULL, NULL, 0 },
996 /* 0x4d */ { NULL, NULL, 0 },
997 /* 0x4e */ { NULL, NULL, 0 },
998 /* 0x4f */ { NULL, NULL, 0 },
999 /* 0x50 */ { NULL, NULL, 0 },
1000 /* 0x51 */ { NULL, NULL, 0 },
1001 /* 0x52 */ { NULL, NULL, 0 },
1002 /* 0x53 */ { NULL, NULL, 0 },
1003 /* 0x54 */ { NULL, NULL, 0 },
1004 /* 0x55 */ { NULL, NULL, 0 },
1005 /* 0x56 */ { NULL, NULL, 0 },
1006 /* 0x57 */ { NULL, NULL, 0 },
1007 /* 0x58 */ { NULL, NULL, 0 },
1008 /* 0x59 */ { NULL, NULL, 0 },
1009 /* 0x5a */ { NULL, NULL, 0 },
1010 /* 0x5b */ { NULL, NULL, 0 },
1011 /* 0x5c */ { NULL, NULL, 0 },
1012 /* 0x5d */ { NULL, NULL, 0 },
1013 /* 0x5e */ { NULL, NULL, 0 },
1014 /* 0x5f */ { NULL, NULL, 0 },
1015 /* 0x60 */ { NULL, NULL, 0 },
1016 /* 0x61 */ { NULL, NULL, 0 },
1017 /* 0x62 */ { NULL, NULL, 0 },
1018 /* 0x63 */ { NULL, NULL, 0 },
1019 /* 0x64 */ { NULL, NULL, 0 },
1020 /* 0x65 */ { NULL, NULL, 0 },
1021 /* 0x66 */ { NULL, NULL, 0 },
1022 /* 0x67 */ { NULL, NULL, 0 },
1023 /* 0x68 */ { NULL, NULL, 0 },
1024 /* 0x69 */ { NULL, NULL, 0 },
1025 /* 0x6a */ { NULL, NULL, 0 },
1026 /* 0x6b */ { NULL, NULL, 0 },
1027 /* 0x6c */ { NULL, NULL, 0 },
1028 /* 0x6d */ { NULL, NULL, 0 },
1029 /* 0x6e */ { NULL, NULL, 0 },
1030 /* 0x6f */ { NULL, NULL, 0 },
1031 /* 0x70 */ { "SMBtcon",reply_tcon,0},
1032 /* 0x71 */ { "SMBtdis",reply_tdis,DO_CHDIR},
1033 /* 0x72 */ { "SMBnegprot",reply_negprot,0},
1034 /* 0x73 */ { "SMBsesssetupX",reply_sesssetup_and_X,0},
1035 /* 0x74 */ { "SMBulogoffX",reply_ulogoffX, 0}, /* ulogoff doesn't give a valid TID */
1036 /* 0x75 */ { "SMBtconX",reply_tcon_and_X,0},
1037 /* 0x76 */ { NULL, NULL, 0 },
1038 /* 0x77 */ { NULL, NULL, 0 },
1039 /* 0x78 */ { NULL, NULL, 0 },
1040 /* 0x79 */ { NULL, NULL, 0 },
1041 /* 0x7a */ { NULL, NULL, 0 },
1042 /* 0x7b */ { NULL, NULL, 0 },
1043 /* 0x7c */ { NULL, NULL, 0 },
1044 /* 0x7d */ { NULL, NULL, 0 },
1045 /* 0x7e */ { NULL, NULL, 0 },
1046 /* 0x7f */ { NULL, NULL, 0 },
1047 /* 0x80 */ { "SMBdskattr",reply_dskattr,AS_USER},
1048 /* 0x81 */ { "SMBsearch",reply_search,AS_USER},
1049 /* 0x82 */ { "SMBffirst",reply_search,AS_USER},
1050 /* 0x83 */ { "SMBfunique",reply_search,AS_USER},
1051 /* 0x84 */ { "SMBfclose",reply_fclose,AS_USER},
1052 /* 0x85 */ { NULL, NULL, 0 },
1053 /* 0x86 */ { NULL, NULL, 0 },
1054 /* 0x87 */ { NULL, NULL, 0 },
1055 /* 0x88 */ { NULL, NULL, 0 },
1056 /* 0x89 */ { NULL, NULL, 0 },
1057 /* 0x8a */ { NULL, NULL, 0 },
1058 /* 0x8b */ { NULL, NULL, 0 },
1059 /* 0x8c */ { NULL, NULL, 0 },
1060 /* 0x8d */ { NULL, NULL, 0 },
1061 /* 0x8e */ { NULL, NULL, 0 },
1062 /* 0x8f */ { NULL, NULL, 0 },
1063 /* 0x90 */ { NULL, NULL, 0 },
1064 /* 0x91 */ { NULL, NULL, 0 },
1065 /* 0x92 */ { NULL, NULL, 0 },
1066 /* 0x93 */ { NULL, NULL, 0 },
1067 /* 0x94 */ { NULL, NULL, 0 },
1068 /* 0x95 */ { NULL, NULL, 0 },
1069 /* 0x96 */ { NULL, NULL, 0 },
1070 /* 0x97 */ { NULL, NULL, 0 },
1071 /* 0x98 */ { NULL, NULL, 0 },
1072 /* 0x99 */ { NULL, NULL, 0 },
1073 /* 0x9a */ { NULL, NULL, 0 },
1074 /* 0x9b */ { NULL, NULL, 0 },
1075 /* 0x9c */ { NULL, NULL, 0 },
1076 /* 0x9d */ { NULL, NULL, 0 },
1077 /* 0x9e */ { NULL, NULL, 0 },
1078 /* 0x9f */ { NULL, NULL, 0 },
1079 /* 0xa0 */ { "SMBnttrans",reply_nttrans, AS_USER | CAN_IPC },
1080 /* 0xa1 */ { "SMBnttranss",reply_nttranss, AS_USER | CAN_IPC },
1081 /* 0xa2 */ { "SMBntcreateX",reply_ntcreate_and_X, AS_USER | CAN_IPC },
1082 /* 0xa3 */ { NULL, NULL, 0 },
1083 /* 0xa4 */ { "SMBntcancel",reply_ntcancel, 0 },
1084 /* 0xa5 */ { "SMBntrename",reply_ntrename, AS_USER | NEED_WRITE },
1085 /* 0xa6 */ { NULL, NULL, 0 },
1086 /* 0xa7 */ { NULL, NULL, 0 },
1087 /* 0xa8 */ { NULL, NULL, 0 },
1088 /* 0xa9 */ { NULL, NULL, 0 },
1089 /* 0xaa */ { NULL, NULL, 0 },
1090 /* 0xab */ { NULL, NULL, 0 },
1091 /* 0xac */ { NULL, NULL, 0 },
1092 /* 0xad */ { NULL, NULL, 0 },
1093 /* 0xae */ { NULL, NULL, 0 },
1094 /* 0xaf */ { NULL, NULL, 0 },
1095 /* 0xb0 */ { NULL, NULL, 0 },
1096 /* 0xb1 */ { NULL, NULL, 0 },
1097 /* 0xb2 */ { NULL, NULL, 0 },
1098 /* 0xb3 */ { NULL, NULL, 0 },
1099 /* 0xb4 */ { NULL, NULL, 0 },
1100 /* 0xb5 */ { NULL, NULL, 0 },
1101 /* 0xb6 */ { NULL, NULL, 0 },
1102 /* 0xb7 */ { NULL, NULL, 0 },
1103 /* 0xb8 */ { NULL, NULL, 0 },
1104 /* 0xb9 */ { NULL, NULL, 0 },
1105 /* 0xba */ { NULL, NULL, 0 },
1106 /* 0xbb */ { NULL, NULL, 0 },
1107 /* 0xbc */ { NULL, NULL, 0 },
1108 /* 0xbd */ { NULL, NULL, 0 },
1109 /* 0xbe */ { NULL, NULL, 0 },
1110 /* 0xbf */ { NULL, NULL, 0 },
1111 /* 0xc0 */ { "SMBsplopen",reply_printopen,AS_USER},
1112 /* 0xc1 */ { "SMBsplwr",reply_printwrite,AS_USER},
1113 /* 0xc2 */ { "SMBsplclose",reply_printclose,AS_USER},
1114 /* 0xc3 */ { "SMBsplretq",reply_printqueue,AS_USER},
1115 /* 0xc4 */ { NULL, NULL, 0 },
1116 /* 0xc5 */ { NULL, NULL, 0 },
1117 /* 0xc6 */ { NULL, NULL, 0 },
1118 /* 0xc7 */ { NULL, NULL, 0 },
1119 /* 0xc8 */ { NULL, NULL, 0 },
1120 /* 0xc9 */ { NULL, NULL, 0 },
1121 /* 0xca */ { NULL, NULL, 0 },
1122 /* 0xcb */ { NULL, NULL, 0 },
1123 /* 0xcc */ { NULL, NULL, 0 },
1124 /* 0xcd */ { NULL, NULL, 0 },
1125 /* 0xce */ { NULL, NULL, 0 },
1126 /* 0xcf */ { NULL, NULL, 0 },
1127 /* 0xd0 */ { "SMBsends",reply_sends,AS_GUEST},
1128 /* 0xd1 */ { "SMBsendb", NULL,AS_GUEST},
1129 /* 0xd2 */ { "SMBfwdname", NULL,AS_GUEST},
1130 /* 0xd3 */ { "SMBcancelf", NULL,AS_GUEST},
1131 /* 0xd4 */ { "SMBgetmac", NULL,AS_GUEST},
1132 /* 0xd5 */ { "SMBsendstrt",reply_sendstrt,AS_GUEST},
1133 /* 0xd6 */ { "SMBsendend",reply_sendend,AS_GUEST},
1134 /* 0xd7 */ { "SMBsendtxt",reply_sendtxt,AS_GUEST},
1135 /* 0xd8 */ { NULL, NULL, 0 },
1136 /* 0xd9 */ { NULL, NULL, 0 },
1137 /* 0xda */ { NULL, NULL, 0 },
1138 /* 0xdb */ { NULL, NULL, 0 },
1139 /* 0xdc */ { NULL, NULL, 0 },
1140 /* 0xdd */ { NULL, NULL, 0 },
1141 /* 0xde */ { NULL, NULL, 0 },
1142 /* 0xdf */ { NULL, NULL, 0 },
1143 /* 0xe0 */ { NULL, NULL, 0 },
1144 /* 0xe1 */ { NULL, NULL, 0 },
1145 /* 0xe2 */ { NULL, NULL, 0 },
1146 /* 0xe3 */ { NULL, NULL, 0 },
1147 /* 0xe4 */ { NULL, NULL, 0 },
1148 /* 0xe5 */ { NULL, NULL, 0 },
1149 /* 0xe6 */ { NULL, NULL, 0 },
1150 /* 0xe7 */ { NULL, NULL, 0 },
1151 /* 0xe8 */ { NULL, NULL, 0 },
1152 /* 0xe9 */ { NULL, NULL, 0 },
1153 /* 0xea */ { NULL, NULL, 0 },
1154 /* 0xeb */ { NULL, NULL, 0 },
1155 /* 0xec */ { NULL, NULL, 0 },
1156 /* 0xed */ { NULL, NULL, 0 },
1157 /* 0xee */ { NULL, NULL, 0 },
1158 /* 0xef */ { NULL, NULL, 0 },
1159 /* 0xf0 */ { NULL, NULL, 0 },
1160 /* 0xf1 */ { NULL, NULL, 0 },
1161 /* 0xf2 */ { NULL, NULL, 0 },
1162 /* 0xf3 */ { NULL, NULL, 0 },
1163 /* 0xf4 */ { NULL, NULL, 0 },
1164 /* 0xf5 */ { NULL, NULL, 0 },
1165 /* 0xf6 */ { NULL, NULL, 0 },
1166 /* 0xf7 */ { NULL, NULL, 0 },
1167 /* 0xf8 */ { NULL, NULL, 0 },
1168 /* 0xf9 */ { NULL, NULL, 0 },
1169 /* 0xfa */ { NULL, NULL, 0 },
1170 /* 0xfb */ { NULL, NULL, 0 },
1171 /* 0xfc */ { NULL, NULL, 0 },
1172 /* 0xfd */ { NULL, NULL, 0 },
1173 /* 0xfe */ { NULL, NULL, 0 },
1174 /* 0xff */ { NULL, NULL, 0 }
1178 /*******************************************************************
1179 allocate and initialize a reply packet
1180 ********************************************************************/
1182 static bool create_outbuf(TALLOC_CTX *mem_ctx, struct smb_request *req,
1183 const char *inbuf, char **outbuf, uint8_t num_words,
1187 * Protect against integer wrap
1189 if ((num_bytes > 0xffffff)
1190 || ((num_bytes + smb_size + num_words*2) > 0xffffff)) {
1192 if (asprintf(&msg, "num_bytes too large: %u",
1193 (unsigned)num_bytes) == -1) {
1194 msg = CONST_DISCARD(char *, "num_bytes too large");
1199 *outbuf = TALLOC_ARRAY(mem_ctx, char,
1200 smb_size + num_words*2 + num_bytes);
1201 if (*outbuf == NULL) {
1205 construct_reply_common(req, inbuf, *outbuf);
1206 srv_set_message(*outbuf, num_words, num_bytes, false);
1208 * Zero out the word area, the caller has to take care of the bcc area
1211 if (num_words != 0) {
1212 memset(*outbuf + smb_vwv0, 0, num_words*2);
1218 void reply_outbuf(struct smb_request *req, uint8 num_words, uint32 num_bytes)
1221 if (!create_outbuf(req, req, (char *)req->inbuf, &outbuf, num_words,
1223 smb_panic("could not allocate output buffer\n");
1225 req->outbuf = (uint8_t *)outbuf;
1229 /*******************************************************************
1230 Dump a packet to a file.
1231 ********************************************************************/
1233 static void smb_dump(const char *name, int type, const char *data, ssize_t len)
1237 if (DEBUGLEVEL < 50) {
1241 if (len < 4) len = smb_len(data)+4;
1242 for (i=1;i<100;i++) {
1243 if (asprintf(&fname, "/tmp/%s.%d.%s", name, i,
1244 type ? "req" : "resp") == -1) {
1247 fd = open(fname, O_WRONLY|O_CREAT|O_EXCL, 0644);
1248 if (fd != -1 || errno != EEXIST) break;
1251 ssize_t ret = write(fd, data, len);
1253 DEBUG(0,("smb_dump: problem: write returned %d\n", (int)ret ));
1255 DEBUG(0,("created %s len %lu\n", fname, (unsigned long)len));
1260 /****************************************************************************
1261 Prepare everything for calling the actual request function, and potentially
1262 call the request function via the "new" interface.
1264 Return False if the "legacy" function needs to be called, everything is
1267 Return True if we're done.
1269 I know this API sucks, but it is the one with the least code change I could
1271 ****************************************************************************/
1273 static connection_struct *switch_message(uint8 type, struct smb_request *req, int size)
1277 connection_struct *conn = NULL;
1281 /* Make sure this is an SMB packet. smb_size contains NetBIOS header
1282 * so subtract 4 from it. */
1283 if (!valid_smb_header(req->inbuf)
1284 || (size < (smb_size - 4))) {
1285 DEBUG(2,("Non-SMB packet of length %d. Terminating server\n",
1286 smb_len(req->inbuf)));
1287 exit_server_cleanly("Non-SMB packet");
1290 if (smb_messages[type].fn == NULL) {
1291 DEBUG(0,("Unknown message type %d!\n",type));
1292 smb_dump("Unknown", 1, (char *)req->inbuf, size);
1293 reply_unknown_new(req, type);
1297 flags = smb_messages[type].flags;
1299 /* In share mode security we must ignore the vuid. */
1300 session_tag = (lp_security() == SEC_SHARE)
1301 ? UID_FIELD_INVALID : req->vuid;
1304 DEBUG(3,("switch message %s (pid %d) conn 0x%lx\n", smb_fn_name(type),
1305 (int)sys_getpid(), (unsigned long)conn));
1307 smb_dump(smb_fn_name(type), 1, (char *)req->inbuf, size);
1309 /* Ensure this value is replaced in the incoming packet. */
1310 SSVAL(req->inbuf,smb_uid,session_tag);
1313 * Ensure the correct username is in current_user_info. This is a
1314 * really ugly bugfix for problems with multiple session_setup_and_X's
1315 * being done and allowing %U and %G substitutions to work correctly.
1316 * There is a reason this code is done here, don't move it unless you
1317 * know what you're doing... :-).
1321 if (session_tag != last_session_tag) {
1322 user_struct *vuser = NULL;
1324 last_session_tag = session_tag;
1325 if(session_tag != UID_FIELD_INVALID) {
1326 vuser = get_valid_user_struct(session_tag);
1328 set_current_user_info(
1329 vuser->server_info->sanitized_username,
1330 vuser->server_info->unix_name,
1331 pdb_get_domain(vuser->server_info
1337 /* Does this call need to be run as the connected user? */
1338 if (flags & AS_USER) {
1340 /* Does this call need a valid tree connection? */
1343 * Amazingly, the error code depends on the command
1346 if (type == SMBntcreateX) {
1347 reply_nterror(req, NT_STATUS_INVALID_HANDLE);
1349 reply_doserror(req, ERRSRV, ERRinvnid);
1354 if (!change_to_user(conn,session_tag)) {
1355 reply_nterror(req, NT_STATUS_DOS(ERRSRV, ERRbaduid));
1356 remove_deferred_open_smb_message(req->mid);
1360 /* All NEED_WRITE and CAN_IPC flags must also have AS_USER. */
1362 /* Does it need write permission? */
1363 if ((flags & NEED_WRITE) && !CAN_WRITE(conn)) {
1364 reply_nterror(req, NT_STATUS_MEDIA_WRITE_PROTECTED);
1368 /* IPC services are limited */
1369 if (IS_IPC(conn) && !(flags & CAN_IPC)) {
1370 reply_doserror(req, ERRSRV,ERRaccess);
1374 /* This call needs to be run as root */
1375 change_to_root_user();
1378 /* load service specific parameters */
1380 if (req->encrypted) {
1381 conn->encrypted_tid = true;
1382 /* encrypted required from now on. */
1383 conn->encrypt_level = Required;
1384 } else if (ENCRYPTION_REQUIRED(conn)) {
1385 if (req->cmd != SMBtrans2 && req->cmd != SMBtranss2) {
1386 exit_server_cleanly("encryption required "
1392 if (!set_current_service(conn,SVAL(req->inbuf,smb_flg),
1393 (flags & (AS_USER|DO_CHDIR)
1395 reply_doserror(req, ERRSRV, ERRaccess);
1398 conn->num_smb_operations++;
1401 /* does this protocol need to be run as guest? */
1402 if ((flags & AS_GUEST)
1403 && (!change_to_guest() ||
1404 !check_access(smbd_server_fd(), lp_hostsallow(-1),
1405 lp_hostsdeny(-1)))) {
1406 reply_doserror(req, ERRSRV, ERRaccess);
1410 smb_messages[type].fn(req);
1414 /****************************************************************************
1415 Construct a reply to the incoming packet.
1416 ****************************************************************************/
1418 static void construct_reply(char *inbuf, int size, size_t unread_bytes, bool encrypted)
1420 connection_struct *conn;
1421 struct smb_request *req;
1425 if (!(req = talloc(talloc_tos(), struct smb_request))) {
1426 smb_panic("could not allocate smb_request");
1428 init_smb_request(req, (uint8 *)inbuf, unread_bytes, encrypted);
1429 req->inbuf = (uint8_t *)talloc_move(req, &inbuf);
1431 conn = switch_message(req->cmd, req, size);
1433 if (req->unread_bytes) {
1434 /* writeX failed. drain socket. */
1435 if (drain_socket(smbd_server_fd(), req->unread_bytes) !=
1436 req->unread_bytes) {
1437 smb_panic("failed to drain pending bytes");
1439 req->unread_bytes = 0;
1442 if (req->outbuf == NULL) {
1446 if (CVAL(req->outbuf,0) == 0) {
1447 show_msg((char *)req->outbuf);
1450 if (!srv_send_smb(smbd_server_fd(),
1451 (char *)req->outbuf,
1452 IS_CONN_ENCRYPTED(conn)||req->encrypted)) {
1453 exit_server_cleanly("construct_reply: srv_send_smb failed.");
1461 /****************************************************************************
1462 Process an smb from the client
1463 ****************************************************************************/
1465 static void process_smb(struct smbd_server_connection *conn,
1466 uint8_t *inbuf, size_t nread, size_t unread_bytes,
1469 int msg_type = CVAL(inbuf,0);
1471 DO_PROFILE_INC(smb_count);
1473 DEBUG( 6, ( "got message type 0x%x of len 0x%x\n", msg_type,
1475 DEBUG( 3, ( "Transaction %d of length %d (%u toread)\n", trans_num,
1477 (unsigned int)unread_bytes ));
1479 if (msg_type != 0) {
1481 * NetBIOS session request, keepalive, etc.
1483 reply_special((char *)inbuf);
1487 show_msg((char *)inbuf);
1489 construct_reply((char *)inbuf,nread,unread_bytes,encrypted);
1494 conn->num_requests++;
1496 /* The timeout_processing function isn't run nearly
1497 often enough to implement 'max log size' without
1498 overrunning the size of the file by many megabytes.
1499 This is especially true if we are running at debug
1500 level 10. Checking every 50 SMBs is a nice
1501 tradeoff of performance vs log file size overrun. */
1503 if ((conn->num_requests % 50) == 0 &&
1504 need_to_check_log_size()) {
1505 change_to_root_user();
1510 /****************************************************************************
1511 Return a string containing the function name of a SMB command.
1512 ****************************************************************************/
1514 const char *smb_fn_name(int type)
1516 const char *unknown_name = "SMBunknown";
1518 if (smb_messages[type].name == NULL)
1519 return(unknown_name);
1521 return(smb_messages[type].name);
1524 /****************************************************************************
1525 Helper functions for contruct_reply.
1526 ****************************************************************************/
1528 void add_to_common_flags2(uint32 v)
1533 void remove_from_common_flags2(uint32 v)
1535 common_flags2 &= ~v;
1538 static void construct_reply_common(struct smb_request *req, const char *inbuf,
1541 srv_set_message(outbuf,0,0,false);
1543 SCVAL(outbuf, smb_com, req->cmd);
1544 SIVAL(outbuf,smb_rcls,0);
1545 SCVAL(outbuf,smb_flg, FLAG_REPLY | (CVAL(inbuf,smb_flg) & FLAG_CASELESS_PATHNAMES));
1546 SSVAL(outbuf,smb_flg2,
1547 (SVAL(inbuf,smb_flg2) & FLAGS2_UNICODE_STRINGS) |
1549 memset(outbuf+smb_pidhigh,'\0',(smb_tid-smb_pidhigh));
1551 SSVAL(outbuf,smb_tid,SVAL(inbuf,smb_tid));
1552 SSVAL(outbuf,smb_pid,SVAL(inbuf,smb_pid));
1553 SSVAL(outbuf,smb_uid,SVAL(inbuf,smb_uid));
1554 SSVAL(outbuf,smb_mid,SVAL(inbuf,smb_mid));
1557 void construct_reply_common_req(struct smb_request *req, char *outbuf)
1559 construct_reply_common(req, (char *)req->inbuf, outbuf);
1563 * How many bytes have we already accumulated up to the current wct field
1567 size_t req_wct_ofs(struct smb_request *req)
1571 if (req->chain_outbuf == NULL) {
1574 buf_size = talloc_get_size(req->chain_outbuf);
1575 if ((buf_size % 4) != 0) {
1576 buf_size += (4 - (buf_size % 4));
1578 return buf_size - 4;
1582 * Hack around reply_nterror & friends not being aware of chained requests,
1583 * generating illegal (i.e. wct==0) chain replies.
1586 static void fixup_chain_error_packet(struct smb_request *req)
1588 uint8_t *outbuf = req->outbuf;
1590 reply_outbuf(req, 2, 0);
1591 memcpy(req->outbuf, outbuf, smb_wct);
1592 TALLOC_FREE(outbuf);
1593 SCVAL(req->outbuf, smb_vwv0, 0xff);
1596 /****************************************************************************
1597 Construct a chained reply and add it to the already made reply
1598 ****************************************************************************/
1600 void chain_reply(struct smb_request *req)
1602 size_t smblen = smb_len(req->inbuf);
1603 size_t already_used, length_needed;
1605 uint32_t chain_offset; /* uint32_t to avoid overflow */
1612 if (IVAL(req->outbuf, smb_rcls) != 0) {
1613 fixup_chain_error_packet(req);
1617 * Any of the AndX requests and replies have at least a wct of
1618 * 2. vwv[0] is the next command, vwv[1] is the offset from the
1619 * beginning of the SMB header to the next wct field.
1621 * None of the AndX requests put anything valuable in vwv[0] and [1],
1622 * so we can overwrite it here to form the chain.
1625 if ((req->wct < 2) || (CVAL(req->outbuf, smb_wct) < 2)) {
1630 * Here we assume that this is the end of the chain. For that we need
1631 * to set "next command" to 0xff and the offset to 0. If we later find
1632 * more commands in the chain, this will be overwritten again.
1635 SCVAL(req->outbuf, smb_vwv0, 0xff);
1636 SCVAL(req->outbuf, smb_vwv0+1, 0);
1637 SSVAL(req->outbuf, smb_vwv1, 0);
1639 if (req->chain_outbuf == NULL) {
1641 * In req->chain_outbuf we collect all the replies. Start the
1642 * chain by copying in the first reply.
1644 * We do the realloc because later on we depend on
1645 * talloc_get_size to determine the length of
1646 * chain_outbuf. The reply_xxx routines might have
1647 * over-allocated (reply_pipe_read_and_X used to be such an
1650 req->chain_outbuf = TALLOC_REALLOC_ARRAY(
1651 req, req->outbuf, uint8_t, smb_len(req->outbuf) + 4);
1652 if (req->chain_outbuf == NULL) {
1657 if (!smb_splice_chain(&req->chain_outbuf,
1658 CVAL(req->outbuf, smb_com),
1659 CVAL(req->outbuf, smb_wct),
1660 (uint16_t *)(req->outbuf + smb_vwv),
1661 0, smb_buflen(req->outbuf),
1662 (uint8_t *)smb_buf(req->outbuf))) {
1665 TALLOC_FREE(req->outbuf);
1669 * We use the old request's vwv field to grab the next chained command
1670 * and offset into the chained fields.
1673 chain_cmd = CVAL(req->vwv+0, 0);
1674 chain_offset = SVAL(req->vwv+1, 0);
1676 if (chain_cmd == 0xff) {
1678 * End of chain, no more requests from the client. So ship the
1681 smb_setlen((char *)(req->chain_outbuf),
1682 talloc_get_size(req->chain_outbuf) - 4);
1683 if (!srv_send_smb(smbd_server_fd(), (char *)req->chain_outbuf,
1684 IS_CONN_ENCRYPTED(req->conn)
1685 ||req->encrypted)) {
1686 exit_server_cleanly("chain_reply: srv_send_smb "
1693 * Check if the client tries to fool us. The request so far uses the
1694 * space to the end of the byte buffer in the request just
1695 * processed. The chain_offset can't point into that area. If that was
1696 * the case, we could end up with an endless processing of the chain,
1697 * we would always handle the same request.
1700 already_used = PTR_DIFF(req->buf+req->buflen, smb_base(req->inbuf));
1701 if (chain_offset < already_used) {
1706 * Next check: Make sure the chain offset does not point beyond the
1707 * overall smb request length.
1710 length_needed = chain_offset+1; /* wct */
1711 if (length_needed > smblen) {
1716 * Now comes the pointer magic. Goal here is to set up req->vwv and
1717 * req->buf correctly again to be able to call the subsequent
1718 * switch_message(). The chain offset (the former vwv[1]) points at
1719 * the new wct field.
1722 wct = CVAL(smb_base(req->inbuf), chain_offset);
1725 * Next consistency check: Make the new vwv array fits in the overall
1729 length_needed += (wct+1)*sizeof(uint16_t); /* vwv+buflen */
1730 if (length_needed > smblen) {
1733 vwv = (uint16_t *)(smb_base(req->inbuf) + chain_offset + 1);
1736 * Now grab the new byte buffer....
1739 buflen = SVAL(vwv+wct, 0);
1742 * .. and check that it fits.
1745 length_needed += buflen;
1746 if (length_needed > smblen) {
1749 buf = (uint8_t *)(vwv+wct+1);
1751 req->cmd = chain_cmd;
1754 req->buflen = buflen;
1757 switch_message(chain_cmd, req, smblen);
1759 if (req->outbuf == NULL) {
1761 * This happens if the chained command has suspended itself or
1762 * if it has called srv_send_smb() itself.
1768 * We end up here if the chained command was not itself chained or
1769 * suspended, but for example a close() command. We now need to splice
1770 * the chained commands' outbuf into the already built up chain_outbuf
1771 * and ship the result.
1777 * We end up here if there's any error in the chain syntax. Report a
1778 * DOS error, just like Windows does.
1780 reply_nterror(req, NT_STATUS_DOS(ERRSRV, ERRerror));
1781 fixup_chain_error_packet(req);
1784 if (!smb_splice_chain(&req->chain_outbuf,
1785 CVAL(req->outbuf, smb_com),
1786 CVAL(req->outbuf, smb_wct),
1787 (uint16_t *)(req->outbuf + smb_vwv),
1788 0, smb_buflen(req->outbuf),
1789 (uint8_t *)smb_buf(req->outbuf))) {
1790 exit_server_cleanly("chain_reply: smb_splice_chain failed\n");
1792 TALLOC_FREE(req->outbuf);
1794 smb_setlen((char *)(req->chain_outbuf),
1795 talloc_get_size(req->chain_outbuf) - 4);
1797 show_msg((char *)(req->chain_outbuf));
1799 if (!srv_send_smb(smbd_server_fd(), (char *)req->chain_outbuf,
1800 IS_CONN_ENCRYPTED(req->conn)||req->encrypted)) {
1801 exit_server_cleanly("construct_reply: srv_send_smb failed.");
1805 /****************************************************************************
1806 Check if services need reloading.
1807 ****************************************************************************/
1809 void check_reload(time_t t)
1811 time_t printcap_cache_time = (time_t)lp_printcap_cache_time();
1813 if(last_smb_conf_reload_time == 0) {
1814 last_smb_conf_reload_time = t;
1815 /* Our printing subsystem might not be ready at smbd start up.
1816 Then no printer is available till the first printers check
1817 is performed. A lower initial interval circumvents this. */
1818 if ( printcap_cache_time > 60 )
1819 last_printer_reload_time = t - printcap_cache_time + 60;
1821 last_printer_reload_time = t;
1824 if (mypid != getpid()) { /* First time or fork happened meanwhile */
1825 /* randomize over 60 second the printcap reload to avoid all
1826 * process hitting cupsd at the same time */
1827 int time_range = 60;
1829 last_printer_reload_time += random() % time_range;
1833 if (reload_after_sighup || (t >= last_smb_conf_reload_time+SMBD_RELOAD_CHECK)) {
1834 reload_services(True);
1835 reload_after_sighup = False;
1836 last_smb_conf_reload_time = t;
1839 /* 'printcap cache time = 0' disable the feature */
1841 if ( printcap_cache_time != 0 )
1843 /* see if it's time to reload or if the clock has been set back */
1845 if ( (t >= last_printer_reload_time+printcap_cache_time)
1846 || (t-last_printer_reload_time < 0) )
1848 DEBUG( 3,( "Printcap cache time expired.\n"));
1850 last_printer_reload_time = t;
1855 static void smbd_server_connection_write_handler(struct smbd_server_connection *conn)
1857 /* TODO: make write nonblocking */
1860 static void smbd_server_connection_read_handler(struct smbd_server_connection *conn)
1862 uint8_t *inbuf = NULL;
1863 size_t inbuf_len = 0;
1864 size_t unread_bytes = 0;
1865 bool encrypted = false;
1866 TALLOC_CTX *mem_ctx = talloc_tos();
1869 /* TODO: make this completely nonblocking */
1871 status = receive_smb_talloc(mem_ctx, smbd_server_fd(),
1872 (char **)(void *)&inbuf,
1877 if (NT_STATUS_EQUAL(status, NT_STATUS_RETRY)) {
1880 if (NT_STATUS_IS_ERR(status)) {
1881 exit_server_cleanly("failed to receive smb request");
1883 if (!NT_STATUS_IS_OK(status)) {
1888 process_smb(conn, inbuf, inbuf_len, unread_bytes, encrypted);
1891 static void smbd_server_connection_handler(struct event_context *ev,
1892 struct fd_event *fde,
1896 struct smbd_server_connection *conn = talloc_get_type(private_data,
1897 struct smbd_server_connection);
1899 if (flags & EVENT_FD_WRITE) {
1900 smbd_server_connection_write_handler(conn);
1901 } else if (flags & EVENT_FD_READ) {
1902 smbd_server_connection_read_handler(conn);
1906 /****************************************************************************
1907 Process commands from the client
1908 ****************************************************************************/
1910 void smbd_process(void)
1913 * Before the first packet, check the global hosts allow/ hosts deny
1914 * parameters before doing any parsing of packets passed to us by the
1915 * client. This prevents attacks on our parsing code from hosts not in
1916 * the hosts allow list.
1919 if (!check_access(smbd_server_fd(), lp_hostsallow(-1),
1920 lp_hostsdeny(-1))) {
1921 char addr[INET6_ADDRSTRLEN];
1924 * send a negative session response "not listening on calling
1927 unsigned char buf[5] = {0x83, 0, 0, 1, 0x81};
1928 DEBUG( 1, ("Connection denied from %s\n",
1929 client_addr(get_client_fd(),addr,sizeof(addr)) ) );
1930 (void)srv_send_smb(smbd_server_fd(),(char *)buf,false);
1931 exit_server_cleanly("connection denied");
1934 max_recv = MIN(lp_maxxmit(),BUFFER_SIZE);
1936 smbd_server_conn = talloc_zero(smbd_event_context(), struct smbd_server_connection);
1937 if (!smbd_server_conn) {
1938 exit_server("failed to create smbd_server_connection");
1940 smbd_server_conn->fde = event_add_fd(smbd_event_context(),
1944 smbd_server_connection_handler,
1946 if (!smbd_server_conn->fde) {
1947 exit_server("failed to create smbd_server_connection fde");
1952 TALLOC_CTX *frame = talloc_stackframe_pool(8192);
1956 status = smbd_server_connection_loop_once(smbd_server_conn);
1957 if (!NT_STATUS_EQUAL(status, NT_STATUS_RETRY) &&
1958 !NT_STATUS_IS_OK(status)) {
1959 DEBUG(3, ("smbd_server_connection_loop_once failed: %s,"
1960 " exiting\n", nt_errstr(status)));