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(fd_set *pfds)
702 DEBUG(10,("async_processing: Doing async processing.\n"));
706 process_kernel_oplocks(smbd_messaging_context(), pfds);
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 Add a fd to the set we will be select(2)ing on.
728 ****************************************************************************/
730 static int select_on_fd(int fd, int maxfd, fd_set *fds)
734 maxfd = MAX(maxfd, fd);
740 /****************************************************************************
741 Do a select on an two fd's - with timeout.
743 If a local udp message has been pushed onto the
744 queue (this can only happen during oplock break
745 processing) call async_processing()
747 If a pending smb message has been pushed onto the
748 queue (this can only happen during oplock break
749 processing) return this next.
751 If the first smbfd is ready then read an smb from it.
752 if the second (loopback UDP) fd is ready then read a message
753 from it and setup the buffer header to identify the length
755 Returns False on timeout or error.
758 The timeout is in milliseconds
759 ****************************************************************************/
761 static NTSTATUS smbd_server_connection_loop_once(struct smbd_server_connection *conn)
768 to.tv_sec = SMBD_SELECT_TIMEOUT;
772 * Note that this call must be before processing any SMB
773 * messages as we need to synchronously process any messages
774 * we may have sent to ourselves from the previous SMB.
776 message_dispatch(smbd_messaging_context());
779 * Setup the select fd sets.
786 * Ensure we process oplock break messages by preference.
787 * We have to do this before the select, after the select
788 * and if the select returns EINTR. This is due to the fact
789 * that the selects called from async_processing can eat an EINTR
790 * caused by a signal (we can't take the break message there).
791 * This is hideously complex - *MUST* be simplified for 3.0 ! JRA.
794 if (oplock_message_waiting(&r_fds)) {
795 DEBUG(10,("receive_message_or_smb: oplock_message is waiting.\n"));
796 async_processing(&r_fds);
798 * After async processing we must go and do the select again, as
799 * the state of the flag in fds for the server file descriptor is
800 * indeterminate - we may have done I/O on it in the oplock processing. JRA.
802 return NT_STATUS_RETRY;
806 * Are there any timed events waiting ? If so, ensure we don't
807 * select for longer than it would take to wait for them.
814 event_add_to_select_args(smbd_event_context(), &now,
815 &r_fds, &w_fds, &to, &maxfd);
818 if (timeval_is_zero(&to)) {
819 /* Process a timed event now... */
820 if (run_events(smbd_event_context(), 0, NULL, NULL)) {
821 return NT_STATUS_RETRY;
827 START_PROFILE(smbd_idle);
829 maxfd = select_on_fd(oplock_notify_fd(), maxfd, &r_fds);
831 selrtn = sys_select(maxfd+1,&r_fds,&w_fds,NULL,&to);
834 END_PROFILE(smbd_idle);
838 if (run_events(smbd_event_context(), selrtn, &r_fds, &w_fds)) {
839 return NT_STATUS_RETRY;
842 /* if we get EINTR then maybe we have received an oplock
843 signal - treat this as select returning 1. This is ugly, but
844 is the best we can do until the oplock code knows more about
846 if (selrtn == -1 && errno == EINTR) {
847 async_processing(&r_fds);
849 * After async processing we must go and do the select again, as
850 * the state of the flag in fds for the server file descriptor is
851 * indeterminate - we may have done I/O on it in the oplock processing. JRA.
853 return NT_STATUS_RETRY;
858 /* something is wrong. Maybe the socket is dead? */
859 return map_nt_error_from_unix(errno);
862 /* Did we timeout ? */
864 return NT_STATUS_RETRY;
868 * Ensure we process oplock break messages by preference.
869 * This is IMPORTANT ! Otherwise we can starve other processes
870 * sending us an oplock break message. JRA.
873 if (oplock_message_waiting(&r_fds)) {
874 async_processing(&r_fds);
876 * After async processing we must go and do the select again, as
877 * the state of the flag in fds for the server file descriptor is
878 * indeterminate - we may have done I/O on it in the oplock processing. JRA.
880 return NT_STATUS_RETRY;
884 * We've just woken up from a protentially long select sleep.
885 * Ensure we process local messages as we need to synchronously
886 * process any messages from other smbd's to avoid file rename race
887 * conditions. This call is cheap if there are no messages waiting.
890 message_dispatch(smbd_messaging_context());
896 * Only allow 5 outstanding trans requests. We're allocating memory, so
900 NTSTATUS allow_new_trans(struct trans_state *list, int mid)
903 for (; list != NULL; list = list->next) {
905 if (list->mid == mid) {
906 return NT_STATUS_INVALID_PARAMETER;
912 return NT_STATUS_INSUFFICIENT_RESOURCES;
918 /****************************************************************************
919 We're terminating and have closed all our files/connections etc.
920 If there are any pending local messages we need to respond to them
921 before termination so that other smbds don't think we just died whilst
923 ****************************************************************************/
925 void respond_to_all_remaining_local_messages(void)
928 * Assert we have no exclusive open oplocks.
931 if(get_number_of_exclusive_open_oplocks()) {
932 DEBUG(0,("respond_to_all_remaining_local_messages: PANIC : we have %d exclusive oplocks.\n",
933 get_number_of_exclusive_open_oplocks() ));
937 process_kernel_oplocks(smbd_messaging_context(), NULL);
944 These flags determine some of the permissions required to do an operation
946 Note that I don't set NEED_WRITE on some write operations because they
947 are used by some brain-dead clients when printing, and I don't want to
948 force write permissions on print services.
950 #define AS_USER (1<<0)
951 #define NEED_WRITE (1<<1) /* Must be paired with AS_USER */
952 #define TIME_INIT (1<<2)
953 #define CAN_IPC (1<<3) /* Must be paired with AS_USER */
954 #define AS_GUEST (1<<5) /* Must *NOT* be paired with AS_USER */
955 #define DO_CHDIR (1<<6)
958 define a list of possible SMB messages and their corresponding
959 functions. Any message that has a NULL function is unimplemented -
960 please feel free to contribute implementations!
962 static const struct smb_message_struct {
964 void (*fn)(struct smb_request *req);
966 } smb_messages[256] = {
968 /* 0x00 */ { "SMBmkdir",reply_mkdir,AS_USER | NEED_WRITE},
969 /* 0x01 */ { "SMBrmdir",reply_rmdir,AS_USER | NEED_WRITE},
970 /* 0x02 */ { "SMBopen",reply_open,AS_USER },
971 /* 0x03 */ { "SMBcreate",reply_mknew,AS_USER},
972 /* 0x04 */ { "SMBclose",reply_close,AS_USER | CAN_IPC },
973 /* 0x05 */ { "SMBflush",reply_flush,AS_USER},
974 /* 0x06 */ { "SMBunlink",reply_unlink,AS_USER | NEED_WRITE },
975 /* 0x07 */ { "SMBmv",reply_mv,AS_USER | NEED_WRITE },
976 /* 0x08 */ { "SMBgetatr",reply_getatr,AS_USER},
977 /* 0x09 */ { "SMBsetatr",reply_setatr,AS_USER | NEED_WRITE},
978 /* 0x0a */ { "SMBread",reply_read,AS_USER},
979 /* 0x0b */ { "SMBwrite",reply_write,AS_USER | CAN_IPC },
980 /* 0x0c */ { "SMBlock",reply_lock,AS_USER},
981 /* 0x0d */ { "SMBunlock",reply_unlock,AS_USER},
982 /* 0x0e */ { "SMBctemp",reply_ctemp,AS_USER },
983 /* 0x0f */ { "SMBmknew",reply_mknew,AS_USER},
984 /* 0x10 */ { "SMBcheckpath",reply_checkpath,AS_USER},
985 /* 0x11 */ { "SMBexit",reply_exit,DO_CHDIR},
986 /* 0x12 */ { "SMBlseek",reply_lseek,AS_USER},
987 /* 0x13 */ { "SMBlockread",reply_lockread,AS_USER},
988 /* 0x14 */ { "SMBwriteunlock",reply_writeunlock,AS_USER},
989 /* 0x15 */ { NULL, NULL, 0 },
990 /* 0x16 */ { NULL, NULL, 0 },
991 /* 0x17 */ { NULL, NULL, 0 },
992 /* 0x18 */ { NULL, NULL, 0 },
993 /* 0x19 */ { NULL, NULL, 0 },
994 /* 0x1a */ { "SMBreadbraw",reply_readbraw,AS_USER},
995 /* 0x1b */ { "SMBreadBmpx",reply_readbmpx,AS_USER},
996 /* 0x1c */ { "SMBreadBs",reply_readbs,AS_USER },
997 /* 0x1d */ { "SMBwritebraw",reply_writebraw,AS_USER},
998 /* 0x1e */ { "SMBwriteBmpx",reply_writebmpx,AS_USER},
999 /* 0x1f */ { "SMBwriteBs",reply_writebs,AS_USER},
1000 /* 0x20 */ { "SMBwritec", NULL,0},
1001 /* 0x21 */ { NULL, NULL, 0 },
1002 /* 0x22 */ { "SMBsetattrE",reply_setattrE,AS_USER | NEED_WRITE },
1003 /* 0x23 */ { "SMBgetattrE",reply_getattrE,AS_USER },
1004 /* 0x24 */ { "SMBlockingX",reply_lockingX,AS_USER },
1005 /* 0x25 */ { "SMBtrans",reply_trans,AS_USER | CAN_IPC },
1006 /* 0x26 */ { "SMBtranss",reply_transs,AS_USER | CAN_IPC},
1007 /* 0x27 */ { "SMBioctl",reply_ioctl,0},
1008 /* 0x28 */ { "SMBioctls", NULL,AS_USER},
1009 /* 0x29 */ { "SMBcopy",reply_copy,AS_USER | NEED_WRITE },
1010 /* 0x2a */ { "SMBmove", NULL,AS_USER | NEED_WRITE },
1011 /* 0x2b */ { "SMBecho",reply_echo,0},
1012 /* 0x2c */ { "SMBwriteclose",reply_writeclose,AS_USER},
1013 /* 0x2d */ { "SMBopenX",reply_open_and_X,AS_USER | CAN_IPC },
1014 /* 0x2e */ { "SMBreadX",reply_read_and_X,AS_USER | CAN_IPC },
1015 /* 0x2f */ { "SMBwriteX",reply_write_and_X,AS_USER | CAN_IPC },
1016 /* 0x30 */ { NULL, NULL, 0 },
1017 /* 0x31 */ { NULL, NULL, 0 },
1018 /* 0x32 */ { "SMBtrans2",reply_trans2, AS_USER | CAN_IPC },
1019 /* 0x33 */ { "SMBtranss2",reply_transs2, AS_USER},
1020 /* 0x34 */ { "SMBfindclose",reply_findclose,AS_USER},
1021 /* 0x35 */ { "SMBfindnclose",reply_findnclose,AS_USER},
1022 /* 0x36 */ { NULL, NULL, 0 },
1023 /* 0x37 */ { NULL, NULL, 0 },
1024 /* 0x38 */ { NULL, NULL, 0 },
1025 /* 0x39 */ { NULL, NULL, 0 },
1026 /* 0x3a */ { NULL, NULL, 0 },
1027 /* 0x3b */ { NULL, NULL, 0 },
1028 /* 0x3c */ { NULL, NULL, 0 },
1029 /* 0x3d */ { NULL, NULL, 0 },
1030 /* 0x3e */ { NULL, NULL, 0 },
1031 /* 0x3f */ { NULL, NULL, 0 },
1032 /* 0x40 */ { NULL, NULL, 0 },
1033 /* 0x41 */ { NULL, NULL, 0 },
1034 /* 0x42 */ { NULL, NULL, 0 },
1035 /* 0x43 */ { NULL, NULL, 0 },
1036 /* 0x44 */ { NULL, NULL, 0 },
1037 /* 0x45 */ { NULL, NULL, 0 },
1038 /* 0x46 */ { NULL, NULL, 0 },
1039 /* 0x47 */ { NULL, NULL, 0 },
1040 /* 0x48 */ { NULL, NULL, 0 },
1041 /* 0x49 */ { NULL, NULL, 0 },
1042 /* 0x4a */ { NULL, NULL, 0 },
1043 /* 0x4b */ { NULL, NULL, 0 },
1044 /* 0x4c */ { NULL, NULL, 0 },
1045 /* 0x4d */ { NULL, NULL, 0 },
1046 /* 0x4e */ { NULL, NULL, 0 },
1047 /* 0x4f */ { NULL, NULL, 0 },
1048 /* 0x50 */ { NULL, NULL, 0 },
1049 /* 0x51 */ { NULL, NULL, 0 },
1050 /* 0x52 */ { NULL, NULL, 0 },
1051 /* 0x53 */ { NULL, NULL, 0 },
1052 /* 0x54 */ { NULL, NULL, 0 },
1053 /* 0x55 */ { NULL, NULL, 0 },
1054 /* 0x56 */ { NULL, NULL, 0 },
1055 /* 0x57 */ { NULL, NULL, 0 },
1056 /* 0x58 */ { NULL, NULL, 0 },
1057 /* 0x59 */ { NULL, NULL, 0 },
1058 /* 0x5a */ { NULL, NULL, 0 },
1059 /* 0x5b */ { NULL, NULL, 0 },
1060 /* 0x5c */ { NULL, NULL, 0 },
1061 /* 0x5d */ { NULL, NULL, 0 },
1062 /* 0x5e */ { NULL, NULL, 0 },
1063 /* 0x5f */ { NULL, NULL, 0 },
1064 /* 0x60 */ { NULL, NULL, 0 },
1065 /* 0x61 */ { NULL, NULL, 0 },
1066 /* 0x62 */ { NULL, NULL, 0 },
1067 /* 0x63 */ { NULL, NULL, 0 },
1068 /* 0x64 */ { NULL, NULL, 0 },
1069 /* 0x65 */ { NULL, NULL, 0 },
1070 /* 0x66 */ { NULL, NULL, 0 },
1071 /* 0x67 */ { NULL, NULL, 0 },
1072 /* 0x68 */ { NULL, NULL, 0 },
1073 /* 0x69 */ { NULL, NULL, 0 },
1074 /* 0x6a */ { NULL, NULL, 0 },
1075 /* 0x6b */ { NULL, NULL, 0 },
1076 /* 0x6c */ { NULL, NULL, 0 },
1077 /* 0x6d */ { NULL, NULL, 0 },
1078 /* 0x6e */ { NULL, NULL, 0 },
1079 /* 0x6f */ { NULL, NULL, 0 },
1080 /* 0x70 */ { "SMBtcon",reply_tcon,0},
1081 /* 0x71 */ { "SMBtdis",reply_tdis,DO_CHDIR},
1082 /* 0x72 */ { "SMBnegprot",reply_negprot,0},
1083 /* 0x73 */ { "SMBsesssetupX",reply_sesssetup_and_X,0},
1084 /* 0x74 */ { "SMBulogoffX",reply_ulogoffX, 0}, /* ulogoff doesn't give a valid TID */
1085 /* 0x75 */ { "SMBtconX",reply_tcon_and_X,0},
1086 /* 0x76 */ { NULL, NULL, 0 },
1087 /* 0x77 */ { NULL, NULL, 0 },
1088 /* 0x78 */ { NULL, NULL, 0 },
1089 /* 0x79 */ { NULL, NULL, 0 },
1090 /* 0x7a */ { NULL, NULL, 0 },
1091 /* 0x7b */ { NULL, NULL, 0 },
1092 /* 0x7c */ { NULL, NULL, 0 },
1093 /* 0x7d */ { NULL, NULL, 0 },
1094 /* 0x7e */ { NULL, NULL, 0 },
1095 /* 0x7f */ { NULL, NULL, 0 },
1096 /* 0x80 */ { "SMBdskattr",reply_dskattr,AS_USER},
1097 /* 0x81 */ { "SMBsearch",reply_search,AS_USER},
1098 /* 0x82 */ { "SMBffirst",reply_search,AS_USER},
1099 /* 0x83 */ { "SMBfunique",reply_search,AS_USER},
1100 /* 0x84 */ { "SMBfclose",reply_fclose,AS_USER},
1101 /* 0x85 */ { NULL, NULL, 0 },
1102 /* 0x86 */ { NULL, NULL, 0 },
1103 /* 0x87 */ { NULL, NULL, 0 },
1104 /* 0x88 */ { NULL, NULL, 0 },
1105 /* 0x89 */ { NULL, NULL, 0 },
1106 /* 0x8a */ { NULL, NULL, 0 },
1107 /* 0x8b */ { NULL, NULL, 0 },
1108 /* 0x8c */ { NULL, NULL, 0 },
1109 /* 0x8d */ { NULL, NULL, 0 },
1110 /* 0x8e */ { NULL, NULL, 0 },
1111 /* 0x8f */ { NULL, NULL, 0 },
1112 /* 0x90 */ { NULL, NULL, 0 },
1113 /* 0x91 */ { NULL, NULL, 0 },
1114 /* 0x92 */ { NULL, NULL, 0 },
1115 /* 0x93 */ { NULL, NULL, 0 },
1116 /* 0x94 */ { NULL, NULL, 0 },
1117 /* 0x95 */ { NULL, NULL, 0 },
1118 /* 0x96 */ { NULL, NULL, 0 },
1119 /* 0x97 */ { NULL, NULL, 0 },
1120 /* 0x98 */ { NULL, NULL, 0 },
1121 /* 0x99 */ { NULL, NULL, 0 },
1122 /* 0x9a */ { NULL, NULL, 0 },
1123 /* 0x9b */ { NULL, NULL, 0 },
1124 /* 0x9c */ { NULL, NULL, 0 },
1125 /* 0x9d */ { NULL, NULL, 0 },
1126 /* 0x9e */ { NULL, NULL, 0 },
1127 /* 0x9f */ { NULL, NULL, 0 },
1128 /* 0xa0 */ { "SMBnttrans",reply_nttrans, AS_USER | CAN_IPC },
1129 /* 0xa1 */ { "SMBnttranss",reply_nttranss, AS_USER | CAN_IPC },
1130 /* 0xa2 */ { "SMBntcreateX",reply_ntcreate_and_X, AS_USER | CAN_IPC },
1131 /* 0xa3 */ { NULL, NULL, 0 },
1132 /* 0xa4 */ { "SMBntcancel",reply_ntcancel, 0 },
1133 /* 0xa5 */ { "SMBntrename",reply_ntrename, AS_USER | NEED_WRITE },
1134 /* 0xa6 */ { NULL, NULL, 0 },
1135 /* 0xa7 */ { NULL, NULL, 0 },
1136 /* 0xa8 */ { NULL, NULL, 0 },
1137 /* 0xa9 */ { NULL, NULL, 0 },
1138 /* 0xaa */ { NULL, NULL, 0 },
1139 /* 0xab */ { NULL, NULL, 0 },
1140 /* 0xac */ { NULL, NULL, 0 },
1141 /* 0xad */ { NULL, NULL, 0 },
1142 /* 0xae */ { NULL, NULL, 0 },
1143 /* 0xaf */ { NULL, NULL, 0 },
1144 /* 0xb0 */ { NULL, NULL, 0 },
1145 /* 0xb1 */ { NULL, NULL, 0 },
1146 /* 0xb2 */ { NULL, NULL, 0 },
1147 /* 0xb3 */ { NULL, NULL, 0 },
1148 /* 0xb4 */ { NULL, NULL, 0 },
1149 /* 0xb5 */ { NULL, NULL, 0 },
1150 /* 0xb6 */ { NULL, NULL, 0 },
1151 /* 0xb7 */ { NULL, NULL, 0 },
1152 /* 0xb8 */ { NULL, NULL, 0 },
1153 /* 0xb9 */ { NULL, NULL, 0 },
1154 /* 0xba */ { NULL, NULL, 0 },
1155 /* 0xbb */ { NULL, NULL, 0 },
1156 /* 0xbc */ { NULL, NULL, 0 },
1157 /* 0xbd */ { NULL, NULL, 0 },
1158 /* 0xbe */ { NULL, NULL, 0 },
1159 /* 0xbf */ { NULL, NULL, 0 },
1160 /* 0xc0 */ { "SMBsplopen",reply_printopen,AS_USER},
1161 /* 0xc1 */ { "SMBsplwr",reply_printwrite,AS_USER},
1162 /* 0xc2 */ { "SMBsplclose",reply_printclose,AS_USER},
1163 /* 0xc3 */ { "SMBsplretq",reply_printqueue,AS_USER},
1164 /* 0xc4 */ { NULL, NULL, 0 },
1165 /* 0xc5 */ { NULL, NULL, 0 },
1166 /* 0xc6 */ { NULL, NULL, 0 },
1167 /* 0xc7 */ { NULL, NULL, 0 },
1168 /* 0xc8 */ { NULL, NULL, 0 },
1169 /* 0xc9 */ { NULL, NULL, 0 },
1170 /* 0xca */ { NULL, NULL, 0 },
1171 /* 0xcb */ { NULL, NULL, 0 },
1172 /* 0xcc */ { NULL, NULL, 0 },
1173 /* 0xcd */ { NULL, NULL, 0 },
1174 /* 0xce */ { NULL, NULL, 0 },
1175 /* 0xcf */ { NULL, NULL, 0 },
1176 /* 0xd0 */ { "SMBsends",reply_sends,AS_GUEST},
1177 /* 0xd1 */ { "SMBsendb", NULL,AS_GUEST},
1178 /* 0xd2 */ { "SMBfwdname", NULL,AS_GUEST},
1179 /* 0xd3 */ { "SMBcancelf", NULL,AS_GUEST},
1180 /* 0xd4 */ { "SMBgetmac", NULL,AS_GUEST},
1181 /* 0xd5 */ { "SMBsendstrt",reply_sendstrt,AS_GUEST},
1182 /* 0xd6 */ { "SMBsendend",reply_sendend,AS_GUEST},
1183 /* 0xd7 */ { "SMBsendtxt",reply_sendtxt,AS_GUEST},
1184 /* 0xd8 */ { NULL, NULL, 0 },
1185 /* 0xd9 */ { NULL, NULL, 0 },
1186 /* 0xda */ { NULL, NULL, 0 },
1187 /* 0xdb */ { NULL, NULL, 0 },
1188 /* 0xdc */ { NULL, NULL, 0 },
1189 /* 0xdd */ { NULL, NULL, 0 },
1190 /* 0xde */ { NULL, NULL, 0 },
1191 /* 0xdf */ { NULL, NULL, 0 },
1192 /* 0xe0 */ { NULL, NULL, 0 },
1193 /* 0xe1 */ { NULL, NULL, 0 },
1194 /* 0xe2 */ { NULL, NULL, 0 },
1195 /* 0xe3 */ { NULL, NULL, 0 },
1196 /* 0xe4 */ { NULL, NULL, 0 },
1197 /* 0xe5 */ { NULL, NULL, 0 },
1198 /* 0xe6 */ { NULL, NULL, 0 },
1199 /* 0xe7 */ { NULL, NULL, 0 },
1200 /* 0xe8 */ { NULL, NULL, 0 },
1201 /* 0xe9 */ { NULL, NULL, 0 },
1202 /* 0xea */ { NULL, NULL, 0 },
1203 /* 0xeb */ { NULL, NULL, 0 },
1204 /* 0xec */ { NULL, NULL, 0 },
1205 /* 0xed */ { NULL, NULL, 0 },
1206 /* 0xee */ { NULL, NULL, 0 },
1207 /* 0xef */ { NULL, NULL, 0 },
1208 /* 0xf0 */ { NULL, NULL, 0 },
1209 /* 0xf1 */ { NULL, NULL, 0 },
1210 /* 0xf2 */ { NULL, NULL, 0 },
1211 /* 0xf3 */ { NULL, NULL, 0 },
1212 /* 0xf4 */ { NULL, NULL, 0 },
1213 /* 0xf5 */ { NULL, NULL, 0 },
1214 /* 0xf6 */ { NULL, NULL, 0 },
1215 /* 0xf7 */ { NULL, NULL, 0 },
1216 /* 0xf8 */ { NULL, NULL, 0 },
1217 /* 0xf9 */ { NULL, NULL, 0 },
1218 /* 0xfa */ { NULL, NULL, 0 },
1219 /* 0xfb */ { NULL, NULL, 0 },
1220 /* 0xfc */ { NULL, NULL, 0 },
1221 /* 0xfd */ { NULL, NULL, 0 },
1222 /* 0xfe */ { NULL, NULL, 0 },
1223 /* 0xff */ { NULL, NULL, 0 }
1227 /*******************************************************************
1228 allocate and initialize a reply packet
1229 ********************************************************************/
1231 static bool create_outbuf(TALLOC_CTX *mem_ctx, struct smb_request *req,
1232 const char *inbuf, char **outbuf, uint8_t num_words,
1236 * Protect against integer wrap
1238 if ((num_bytes > 0xffffff)
1239 || ((num_bytes + smb_size + num_words*2) > 0xffffff)) {
1241 if (asprintf(&msg, "num_bytes too large: %u",
1242 (unsigned)num_bytes) == -1) {
1243 msg = CONST_DISCARD(char *, "num_bytes too large");
1248 *outbuf = TALLOC_ARRAY(mem_ctx, char,
1249 smb_size + num_words*2 + num_bytes);
1250 if (*outbuf == NULL) {
1254 construct_reply_common(req, inbuf, *outbuf);
1255 srv_set_message(*outbuf, num_words, num_bytes, false);
1257 * Zero out the word area, the caller has to take care of the bcc area
1260 if (num_words != 0) {
1261 memset(*outbuf + smb_vwv0, 0, num_words*2);
1267 void reply_outbuf(struct smb_request *req, uint8 num_words, uint32 num_bytes)
1270 if (!create_outbuf(req, req, (char *)req->inbuf, &outbuf, num_words,
1272 smb_panic("could not allocate output buffer\n");
1274 req->outbuf = (uint8_t *)outbuf;
1278 /*******************************************************************
1279 Dump a packet to a file.
1280 ********************************************************************/
1282 static void smb_dump(const char *name, int type, const char *data, ssize_t len)
1286 if (DEBUGLEVEL < 50) {
1290 if (len < 4) len = smb_len(data)+4;
1291 for (i=1;i<100;i++) {
1292 if (asprintf(&fname, "/tmp/%s.%d.%s", name, i,
1293 type ? "req" : "resp") == -1) {
1296 fd = open(fname, O_WRONLY|O_CREAT|O_EXCL, 0644);
1297 if (fd != -1 || errno != EEXIST) break;
1300 ssize_t ret = write(fd, data, len);
1302 DEBUG(0,("smb_dump: problem: write returned %d\n", (int)ret ));
1304 DEBUG(0,("created %s len %lu\n", fname, (unsigned long)len));
1309 /****************************************************************************
1310 Prepare everything for calling the actual request function, and potentially
1311 call the request function via the "new" interface.
1313 Return False if the "legacy" function needs to be called, everything is
1316 Return True if we're done.
1318 I know this API sucks, but it is the one with the least code change I could
1320 ****************************************************************************/
1322 static connection_struct *switch_message(uint8 type, struct smb_request *req, int size)
1326 connection_struct *conn = NULL;
1330 /* Make sure this is an SMB packet. smb_size contains NetBIOS header
1331 * so subtract 4 from it. */
1332 if (!valid_smb_header(req->inbuf)
1333 || (size < (smb_size - 4))) {
1334 DEBUG(2,("Non-SMB packet of length %d. Terminating server\n",
1335 smb_len(req->inbuf)));
1336 exit_server_cleanly("Non-SMB packet");
1339 if (smb_messages[type].fn == NULL) {
1340 DEBUG(0,("Unknown message type %d!\n",type));
1341 smb_dump("Unknown", 1, (char *)req->inbuf, size);
1342 reply_unknown_new(req, type);
1346 flags = smb_messages[type].flags;
1348 /* In share mode security we must ignore the vuid. */
1349 session_tag = (lp_security() == SEC_SHARE)
1350 ? UID_FIELD_INVALID : req->vuid;
1353 DEBUG(3,("switch message %s (pid %d) conn 0x%lx\n", smb_fn_name(type),
1354 (int)sys_getpid(), (unsigned long)conn));
1356 smb_dump(smb_fn_name(type), 1, (char *)req->inbuf, size);
1358 /* Ensure this value is replaced in the incoming packet. */
1359 SSVAL(req->inbuf,smb_uid,session_tag);
1362 * Ensure the correct username is in current_user_info. This is a
1363 * really ugly bugfix for problems with multiple session_setup_and_X's
1364 * being done and allowing %U and %G substitutions to work correctly.
1365 * There is a reason this code is done here, don't move it unless you
1366 * know what you're doing... :-).
1370 if (session_tag != last_session_tag) {
1371 user_struct *vuser = NULL;
1373 last_session_tag = session_tag;
1374 if(session_tag != UID_FIELD_INVALID) {
1375 vuser = get_valid_user_struct(session_tag);
1377 set_current_user_info(
1378 vuser->server_info->sanitized_username,
1379 vuser->server_info->unix_name,
1380 pdb_get_fullname(vuser->server_info
1382 pdb_get_domain(vuser->server_info
1388 /* Does this call need to be run as the connected user? */
1389 if (flags & AS_USER) {
1391 /* Does this call need a valid tree connection? */
1394 * Amazingly, the error code depends on the command
1397 if (type == SMBntcreateX) {
1398 reply_nterror(req, NT_STATUS_INVALID_HANDLE);
1400 reply_doserror(req, ERRSRV, ERRinvnid);
1405 if (!change_to_user(conn,session_tag)) {
1406 reply_nterror(req, NT_STATUS_DOS(ERRSRV, ERRbaduid));
1407 remove_deferred_open_smb_message(req->mid);
1411 /* All NEED_WRITE and CAN_IPC flags must also have AS_USER. */
1413 /* Does it need write permission? */
1414 if ((flags & NEED_WRITE) && !CAN_WRITE(conn)) {
1415 reply_nterror(req, NT_STATUS_MEDIA_WRITE_PROTECTED);
1419 /* IPC services are limited */
1420 if (IS_IPC(conn) && !(flags & CAN_IPC)) {
1421 reply_doserror(req, ERRSRV,ERRaccess);
1425 /* This call needs to be run as root */
1426 change_to_root_user();
1429 /* load service specific parameters */
1431 if (req->encrypted) {
1432 conn->encrypted_tid = true;
1433 /* encrypted required from now on. */
1434 conn->encrypt_level = Required;
1435 } else if (ENCRYPTION_REQUIRED(conn)) {
1436 if (req->cmd != SMBtrans2 && req->cmd != SMBtranss2) {
1437 exit_server_cleanly("encryption required "
1443 if (!set_current_service(conn,SVAL(req->inbuf,smb_flg),
1444 (flags & (AS_USER|DO_CHDIR)
1446 reply_doserror(req, ERRSRV, ERRaccess);
1449 conn->num_smb_operations++;
1452 /* does this protocol need to be run as guest? */
1453 if ((flags & AS_GUEST)
1454 && (!change_to_guest() ||
1455 !check_access(smbd_server_fd(), lp_hostsallow(-1),
1456 lp_hostsdeny(-1)))) {
1457 reply_doserror(req, ERRSRV, ERRaccess);
1461 smb_messages[type].fn(req);
1465 /****************************************************************************
1466 Construct a reply to the incoming packet.
1467 ****************************************************************************/
1469 static void construct_reply(char *inbuf, int size, size_t unread_bytes, bool encrypted)
1471 connection_struct *conn;
1472 struct smb_request *req;
1476 if (!(req = talloc(talloc_tos(), struct smb_request))) {
1477 smb_panic("could not allocate smb_request");
1479 init_smb_request(req, (uint8 *)inbuf, unread_bytes, encrypted);
1480 req->inbuf = (uint8_t *)talloc_move(req, &inbuf);
1482 conn = switch_message(req->cmd, req, size);
1484 if (req->unread_bytes) {
1485 /* writeX failed. drain socket. */
1486 if (drain_socket(smbd_server_fd(), req->unread_bytes) !=
1487 req->unread_bytes) {
1488 smb_panic("failed to drain pending bytes");
1490 req->unread_bytes = 0;
1493 if (req->outbuf == NULL) {
1497 if (CVAL(req->outbuf,0) == 0) {
1498 show_msg((char *)req->outbuf);
1501 if (!srv_send_smb(smbd_server_fd(),
1502 (char *)req->outbuf,
1503 IS_CONN_ENCRYPTED(conn)||req->encrypted)) {
1504 exit_server_cleanly("construct_reply: srv_send_smb failed.");
1512 /****************************************************************************
1513 Process an smb from the client
1514 ****************************************************************************/
1516 static void process_smb(struct smbd_server_connection *conn,
1517 uint8_t *inbuf, size_t nread, size_t unread_bytes,
1520 int msg_type = CVAL(inbuf,0);
1522 DO_PROFILE_INC(smb_count);
1524 DEBUG( 6, ( "got message type 0x%x of len 0x%x\n", msg_type,
1526 DEBUG( 3, ( "Transaction %d of length %d (%u toread)\n", trans_num,
1528 (unsigned int)unread_bytes ));
1530 if (msg_type != 0) {
1532 * NetBIOS session request, keepalive, etc.
1534 reply_special((char *)inbuf);
1538 show_msg((char *)inbuf);
1540 construct_reply((char *)inbuf,nread,unread_bytes,encrypted);
1545 conn->num_requests++;
1547 /* The timeout_processing function isn't run nearly
1548 often enough to implement 'max log size' without
1549 overrunning the size of the file by many megabytes.
1550 This is especially true if we are running at debug
1551 level 10. Checking every 50 SMBs is a nice
1552 tradeoff of performance vs log file size overrun. */
1554 if ((conn->num_requests % 50) == 0 &&
1555 need_to_check_log_size()) {
1556 change_to_root_user();
1561 /****************************************************************************
1562 Return a string containing the function name of a SMB command.
1563 ****************************************************************************/
1565 const char *smb_fn_name(int type)
1567 const char *unknown_name = "SMBunknown";
1569 if (smb_messages[type].name == NULL)
1570 return(unknown_name);
1572 return(smb_messages[type].name);
1575 /****************************************************************************
1576 Helper functions for contruct_reply.
1577 ****************************************************************************/
1579 void add_to_common_flags2(uint32 v)
1584 void remove_from_common_flags2(uint32 v)
1586 common_flags2 &= ~v;
1589 static void construct_reply_common(struct smb_request *req, const char *inbuf,
1592 srv_set_message(outbuf,0,0,false);
1594 SCVAL(outbuf, smb_com, req->cmd);
1595 SIVAL(outbuf,smb_rcls,0);
1596 SCVAL(outbuf,smb_flg, FLAG_REPLY | (CVAL(inbuf,smb_flg) & FLAG_CASELESS_PATHNAMES));
1597 SSVAL(outbuf,smb_flg2,
1598 (SVAL(inbuf,smb_flg2) & FLAGS2_UNICODE_STRINGS) |
1600 memset(outbuf+smb_pidhigh,'\0',(smb_tid-smb_pidhigh));
1602 SSVAL(outbuf,smb_tid,SVAL(inbuf,smb_tid));
1603 SSVAL(outbuf,smb_pid,SVAL(inbuf,smb_pid));
1604 SSVAL(outbuf,smb_uid,SVAL(inbuf,smb_uid));
1605 SSVAL(outbuf,smb_mid,SVAL(inbuf,smb_mid));
1608 void construct_reply_common_req(struct smb_request *req, char *outbuf)
1610 construct_reply_common(req, (char *)req->inbuf, outbuf);
1613 /****************************************************************************
1614 Construct a chained reply and add it to the already made reply
1615 ****************************************************************************/
1619 void chain_reply(struct smb_request *req)
1622 * Dirty little const_discard: We mess with req->inbuf, which is
1623 * declared as const. If maybe at some point this routine gets
1624 * rewritten, this const_discard could go away.
1626 char *inbuf = CONST_DISCARD(char *, req->inbuf);
1627 int size = smb_len(req->inbuf)+4;
1629 int smb_com1, smb_com2 = CVAL(inbuf,smb_vwv0);
1630 unsigned smb_off2 = SVAL(inbuf,smb_vwv1);
1634 char inbuf_saved[smb_wct];
1635 char *outbuf = (char *)req->outbuf;
1636 size_t outsize = smb_len(outbuf) + 4;
1637 size_t outsize_padded;
1639 size_t ofs, to_move;
1641 struct smb_request *req2;
1642 size_t caller_outputlen;
1643 char *caller_output;
1645 /* Maybe its not chained, or it's an error packet. */
1646 if (smb_com2 == 0xFF || SVAL(outbuf,smb_rcls) != 0) {
1647 SCVAL(outbuf,smb_vwv0,0xFF);
1651 if (chain_size == 0) {
1652 /* this is the first part of the chain */
1657 * We need to save the output the caller added to the chain so that we
1658 * can splice it into the final output buffer later.
1661 caller_outputlen = outsize - smb_wct;
1663 caller_output = (char *)memdup(outbuf + smb_wct, caller_outputlen);
1665 if (caller_output == NULL) {
1666 /* TODO: NT_STATUS_NO_MEMORY */
1667 smb_panic("could not dup outbuf");
1671 * The original Win95 redirector dies on a reply to
1672 * a lockingX and read chain unless the chain reply is
1673 * 4 byte aligned. JRA.
1676 outsize_padded = (outsize + 3) & ~3;
1677 padding = outsize_padded - outsize;
1680 * remember how much the caller added to the chain, only counting
1681 * stuff after the parameter words
1683 chain_size += (outsize_padded - smb_wct);
1686 * work out pointers into the original packets. The
1687 * headers on these need to be filled in
1689 inbuf2 = orig_inbuf + smb_off2 + 4 - smb_wct;
1691 /* remember the original command type */
1692 smb_com1 = CVAL(orig_inbuf,smb_com);
1694 /* save the data which will be overwritten by the new headers */
1695 memcpy(inbuf_saved,inbuf2,smb_wct);
1697 /* give the new packet the same header as the last part of the SMB */
1698 memmove(inbuf2,inbuf,smb_wct);
1700 /* create the in buffer */
1701 SCVAL(inbuf2,smb_com,smb_com2);
1703 /* work out the new size for the in buffer. */
1704 new_size = size - (inbuf2 - inbuf);
1706 DEBUG(0,("chain_reply: chain packet size incorrect "
1707 "(orig size = %d, offset = %d)\n",
1708 size, (int)(inbuf2 - inbuf) ));
1709 exit_server_cleanly("Bad chained packet");
1713 /* And set it in the header. */
1714 smb_setlen(inbuf2, new_size - 4);
1716 DEBUG(3,("Chained message\n"));
1719 if (!(req2 = talloc(talloc_tos(), struct smb_request))) {
1720 smb_panic("could not allocate smb_request");
1722 init_smb_request(req2, (uint8 *)inbuf2,0, req->encrypted);
1723 req2->inbuf = (uint8_t *)inbuf2;
1724 req2->chain_fsp = req->chain_fsp;
1726 /* process the request */
1727 switch_message(smb_com2, req2, new_size);
1730 * We don't accept deferred operations in chained requests.
1732 SMB_ASSERT(req2->outbuf != NULL);
1733 outsize2 = smb_len(req2->outbuf)+4;
1736 * Move away the new command output so that caller_output fits in,
1737 * copy in the caller_output saved above.
1740 SMB_ASSERT(outsize_padded >= smb_wct);
1743 * "ofs" is the space we need for caller_output. Equal to
1744 * caller_outputlen plus the padding.
1747 ofs = outsize_padded - smb_wct;
1750 * "to_move" is the amount of bytes the secondary routine gave us
1753 to_move = outsize2 - smb_wct;
1755 if (to_move + ofs + smb_wct + chain_size > max_send) {
1756 smb_panic("replies too large -- would have to cut");
1760 * In the "new" API "outbuf" is allocated via reply_outbuf, just for
1761 * the first request in the chain. So we have to re-allocate it. In
1762 * the "old" API the only outbuf ever used is the global OutBuffer
1763 * which is always large enough.
1766 outbuf = TALLOC_REALLOC_ARRAY(NULL, outbuf, char,
1767 to_move + ofs + smb_wct);
1768 if (outbuf == NULL) {
1769 smb_panic("could not realloc outbuf");
1772 req->outbuf = (uint8 *)outbuf;
1774 memmove(outbuf + smb_wct + ofs, req2->outbuf + smb_wct, to_move);
1775 memcpy(outbuf + smb_wct, caller_output, caller_outputlen);
1778 * copy the new reply header over the old one but preserve the smb_com
1781 memmove(outbuf, req2->outbuf, smb_wct);
1782 SCVAL(outbuf, smb_com, smb_com1);
1785 * We've just copied in the whole "wct" area from the secondary
1786 * function. Fix up the chaining: com2 and the offset need to be
1790 SCVAL(outbuf, smb_vwv0, smb_com2);
1791 SSVAL(outbuf, smb_vwv1, chain_size + smb_wct - 4);
1796 * Due to padding we have some uninitialized bytes after the
1800 memset(outbuf + outsize, 0, padding);
1803 smb_setlen(outbuf, outsize2 + caller_outputlen + padding - 4);
1806 * restore the saved data, being careful not to overwrite any data
1807 * from the reply header
1809 memcpy(inbuf2,inbuf_saved,smb_wct);
1811 SAFE_FREE(caller_output);
1815 * Reset the chain_size for our caller's offset calculations
1818 chain_size -= (outsize_padded - smb_wct);
1826 * How many bytes have we already accumulated up to the current wct field
1830 size_t req_wct_ofs(struct smb_request *req)
1834 if (req->chain_outbuf == NULL) {
1837 buf_size = talloc_get_size(req->chain_outbuf);
1838 if ((buf_size % 4) != 0) {
1839 buf_size += (4 - (buf_size % 4));
1841 return buf_size - 4;
1845 * Hack around reply_nterror & friends not being aware of chained requests,
1846 * generating illegal (i.e. wct==0) chain replies.
1849 static void fixup_chain_error_packet(struct smb_request *req)
1851 uint8_t *outbuf = req->outbuf;
1853 reply_outbuf(req, 2, 0);
1854 memcpy(req->outbuf, outbuf, smb_wct);
1855 TALLOC_FREE(outbuf);
1856 SCVAL(req->outbuf, smb_vwv0, 0xff);
1859 void chain_reply(struct smb_request *req)
1861 size_t smblen = smb_len(req->inbuf);
1862 size_t already_used, length_needed;
1864 uint32_t chain_offset; /* uint32_t to avoid overflow */
1871 if (IVAL(req->outbuf, smb_rcls) != 0) {
1872 fixup_chain_error_packet(req);
1876 * Any of the AndX requests and replies have at least a wct of
1877 * 2. vwv[0] is the next command, vwv[1] is the offset from the
1878 * beginning of the SMB header to the next wct field.
1880 * None of the AndX requests put anything valuable in vwv[0] and [1],
1881 * so we can overwrite it here to form the chain.
1884 if ((req->wct < 2) || (CVAL(req->outbuf, smb_wct) < 2)) {
1889 * Here we assume that this is the end of the chain. For that we need
1890 * to set "next command" to 0xff and the offset to 0. If we later find
1891 * more commands in the chain, this will be overwritten again.
1894 SCVAL(req->outbuf, smb_vwv0, 0xff);
1895 SCVAL(req->outbuf, smb_vwv0+1, 0);
1896 SSVAL(req->outbuf, smb_vwv1, 0);
1898 if (req->chain_outbuf == NULL) {
1900 * In req->chain_outbuf we collect all the replies. Start the
1901 * chain by copying in the first reply.
1903 req->chain_outbuf = req->outbuf;
1906 if (!smb_splice_chain(&req->chain_outbuf,
1907 CVAL(req->outbuf, smb_com),
1908 CVAL(req->outbuf, smb_wct),
1909 (uint16_t *)(req->outbuf + smb_vwv),
1910 0, smb_buflen(req->outbuf),
1911 (uint8_t *)smb_buf(req->outbuf))) {
1914 TALLOC_FREE(req->outbuf);
1918 * We use the old request's vwv field to grab the next chained command
1919 * and offset into the chained fields.
1922 chain_cmd = CVAL(req->vwv+0, 0);
1923 chain_offset = SVAL(req->vwv+1, 0);
1925 if (chain_cmd == 0xff) {
1927 * End of chain, no more requests from the client. So ship the
1930 smb_setlen((char *)(req->chain_outbuf),
1931 talloc_get_size(req->chain_outbuf) - 4);
1932 if (!srv_send_smb(smbd_server_fd(), (char *)req->chain_outbuf,
1933 IS_CONN_ENCRYPTED(req->conn)
1934 ||req->encrypted)) {
1935 exit_server_cleanly("chain_reply: srv_send_smb "
1942 * Check if the client tries to fool us. The request so far uses the
1943 * space to the end of the byte buffer in the request just
1944 * processed. The chain_offset can't point into that area. If that was
1945 * the case, we could end up with an endless processing of the chain,
1946 * we would always handle the same request.
1949 already_used = PTR_DIFF(req->buf+req->buflen, smb_base(req->inbuf));
1950 if (chain_offset < already_used) {
1955 * Next check: Make sure the chain offset does not point beyond the
1956 * overall smb request length.
1959 length_needed = chain_offset+1; /* wct */
1960 if (length_needed > smblen) {
1965 * Now comes the pointer magic. Goal here is to set up req->vwv and
1966 * req->buf correctly again to be able to call the subsequent
1967 * switch_message(). The chain offset (the former vwv[1]) points at
1968 * the new wct field.
1971 wct = CVAL(smb_base(req->inbuf), chain_offset);
1974 * Next consistency check: Make the new vwv array fits in the overall
1978 length_needed += (wct+1)*sizeof(uint16_t); /* vwv+buflen */
1979 if (length_needed > smblen) {
1982 vwv = (uint16_t *)(smb_base(req->inbuf) + chain_offset + 1);
1985 * Now grab the new byte buffer....
1988 buflen = SVAL(vwv+wct, 0);
1991 * .. and check that it fits.
1994 length_needed += buflen;
1995 if (length_needed > smblen) {
1998 buf = (uint8_t *)(vwv+wct+1);
2000 req->cmd = chain_cmd;
2003 req->buflen = buflen;
2006 switch_message(chain_cmd, req, smblen);
2008 if (req->outbuf == NULL) {
2010 * This happens if the chained command has suspended itself or
2011 * if it has called srv_send_smb() itself.
2017 * We end up here if the chained command was not itself chained or
2018 * suspended, but for example a close() command. We now need to splice
2019 * the chained commands' outbuf into the already built up chain_outbuf
2020 * and ship the result.
2026 * We end up here if there's any error in the chain syntax. Report a
2027 * DOS error, just like Windows does.
2029 reply_nterror(req, NT_STATUS_DOS(ERRSRV, ERRerror));
2030 fixup_chain_error_packet(req);
2033 if (!smb_splice_chain(&req->chain_outbuf,
2034 CVAL(req->outbuf, smb_com),
2035 CVAL(req->outbuf, smb_wct),
2036 (uint16_t *)(req->outbuf + smb_vwv),
2037 0, smb_buflen(req->outbuf),
2038 (uint8_t *)smb_buf(req->outbuf))) {
2039 exit_server_cleanly("chain_reply: smb_splice_chain failed\n");
2041 TALLOC_FREE(req->outbuf);
2043 smb_setlen((char *)(req->chain_outbuf),
2044 talloc_get_size(req->chain_outbuf) - 4);
2046 show_msg((char *)(req->chain_outbuf));
2048 if (!srv_send_smb(smbd_server_fd(), (char *)req->chain_outbuf,
2049 IS_CONN_ENCRYPTED(req->conn)||req->encrypted)) {
2050 exit_server_cleanly("construct_reply: srv_send_smb failed.");
2056 /****************************************************************************
2057 Check if services need reloading.
2058 ****************************************************************************/
2060 void check_reload(time_t t)
2062 time_t printcap_cache_time = (time_t)lp_printcap_cache_time();
2064 if(last_smb_conf_reload_time == 0) {
2065 last_smb_conf_reload_time = t;
2066 /* Our printing subsystem might not be ready at smbd start up.
2067 Then no printer is available till the first printers check
2068 is performed. A lower initial interval circumvents this. */
2069 if ( printcap_cache_time > 60 )
2070 last_printer_reload_time = t - printcap_cache_time + 60;
2072 last_printer_reload_time = t;
2075 if (mypid != getpid()) { /* First time or fork happened meanwhile */
2076 /* randomize over 60 second the printcap reload to avoid all
2077 * process hitting cupsd at the same time */
2078 int time_range = 60;
2080 last_printer_reload_time += random() % time_range;
2084 if (reload_after_sighup || (t >= last_smb_conf_reload_time+SMBD_RELOAD_CHECK)) {
2085 reload_services(True);
2086 reload_after_sighup = False;
2087 last_smb_conf_reload_time = t;
2090 /* 'printcap cache time = 0' disable the feature */
2092 if ( printcap_cache_time != 0 )
2094 /* see if it's time to reload or if the clock has been set back */
2096 if ( (t >= last_printer_reload_time+printcap_cache_time)
2097 || (t-last_printer_reload_time < 0) )
2099 DEBUG( 3,( "Printcap cache time expired.\n"));
2101 last_printer_reload_time = t;
2106 static void smbd_server_connection_write_handler(struct smbd_server_connection *conn)
2108 /* TODO: make write nonblocking */
2111 static void smbd_server_connection_read_handler(struct smbd_server_connection *conn)
2113 uint8_t *inbuf = NULL;
2114 size_t inbuf_len = 0;
2115 size_t unread_bytes = 0;
2116 bool encrypted = false;
2117 TALLOC_CTX *mem_ctx = talloc_tos();
2120 /* TODO: make this completely nonblocking */
2122 status = receive_smb_talloc(mem_ctx, smbd_server_fd(),
2123 (char **)(void *)&inbuf,
2128 if (NT_STATUS_EQUAL(status, NT_STATUS_RETRY)) {
2131 if (NT_STATUS_IS_ERR(status)) {
2132 exit_server_cleanly("failed to receive smb request");
2134 if (!NT_STATUS_IS_OK(status)) {
2139 process_smb(conn, inbuf, inbuf_len, unread_bytes, encrypted);
2142 static void smbd_server_connection_handler(struct event_context *ev,
2143 struct fd_event *fde,
2147 struct smbd_server_connection *conn = talloc_get_type(private_data,
2148 struct smbd_server_connection);
2150 if (flags & EVENT_FD_WRITE) {
2151 smbd_server_connection_write_handler(conn);
2152 } else if (flags & EVENT_FD_READ) {
2153 smbd_server_connection_read_handler(conn);
2157 /****************************************************************************
2158 Process commands from the client
2159 ****************************************************************************/
2161 void smbd_process(void)
2164 * Before the first packet, check the global hosts allow/ hosts deny
2165 * parameters before doing any parsing of packets passed to us by the
2166 * client. This prevents attacks on our parsing code from hosts not in
2167 * the hosts allow list.
2170 if (!check_access(smbd_server_fd(), lp_hostsallow(-1),
2171 lp_hostsdeny(-1))) {
2172 char addr[INET6_ADDRSTRLEN];
2175 * send a negative session response "not listening on calling
2178 unsigned char buf[5] = {0x83, 0, 0, 1, 0x81};
2179 DEBUG( 1, ("Connection denied from %s\n",
2180 client_addr(get_client_fd(),addr,sizeof(addr)) ) );
2181 (void)srv_send_smb(smbd_server_fd(),(char *)buf,false);
2182 exit_server_cleanly("connection denied");
2185 max_recv = MIN(lp_maxxmit(),BUFFER_SIZE);
2187 smbd_server_conn = talloc_zero(smbd_event_context(), struct smbd_server_connection);
2188 if (!smbd_server_conn) {
2189 exit_server("failed to create smbd_server_connection");
2191 smbd_server_conn->fde = event_add_fd(smbd_event_context(),
2195 smbd_server_connection_handler,
2197 if (!smbd_server_conn->fde) {
2198 exit_server("failed to create smbd_server_connection fde");
2203 TALLOC_CTX *frame = talloc_stackframe_pool(8192);
2207 status = smbd_server_connection_loop_once(smbd_server_conn);
2208 if (!NT_STATUS_EQUAL(status, NT_STATUS_RETRY) &&
2209 !NT_STATUS_IS_OK(status)) {
2210 DEBUG(3, ("smbd_server_connection_loop_once failed: %s,"
2211 " exiting\n", nt_errstr(status)));