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 static void smbd_sig_term_handler(struct tevent_context *ev,
696 struct tevent_signal *se,
702 exit_server_cleanly("termination signal");
705 void smbd_setup_sig_term_handler(void)
707 struct tevent_signal *se;
709 se = tevent_add_signal(smbd_event_context(),
710 smbd_event_context(),
712 smbd_sig_term_handler,
715 exit_server("failed to setup SIGTERM handler");
719 static void smbd_sig_hup_handler(struct tevent_context *ev,
720 struct tevent_signal *se,
726 change_to_root_user();
727 DEBUG(1,("Reloading services after SIGHUP\n"));
728 reload_services(False);
731 void smbd_setup_sig_hup_handler(void)
733 struct tevent_signal *se;
735 se = tevent_add_signal(smbd_event_context(),
736 smbd_event_context(),
738 smbd_sig_hup_handler,
741 exit_server("failed to setup SIGHUP handler");
745 /****************************************************************************
746 Do all async processing in here. This includes kernel oplock messages, change
748 ****************************************************************************/
750 static void async_processing(void)
752 DEBUG(10,("async_processing: Doing async processing.\n"));
756 process_kernel_oplocks(smbd_messaging_context());
758 /* Do the aio check again after receive_local_message as it does a
759 select and may have eaten our signal. */
760 /* Is this till true? -- vl */
764 /****************************************************************************
765 Do a select on an two fd's - with timeout.
767 If a local udp message has been pushed onto the
768 queue (this can only happen during oplock break
769 processing) call async_processing()
771 If a pending smb message has been pushed onto the
772 queue (this can only happen during oplock break
773 processing) return this next.
775 If the first smbfd is ready then read an smb from it.
776 if the second (loopback UDP) fd is ready then read a message
777 from it and setup the buffer header to identify the length
779 Returns False on timeout or error.
782 The timeout is in milliseconds
783 ****************************************************************************/
785 static NTSTATUS smbd_server_connection_loop_once(struct smbd_server_connection *conn)
792 to.tv_sec = SMBD_SELECT_TIMEOUT;
796 * Setup the select fd sets.
803 * Ensure we process oplock break messages by preference.
804 * We have to do this before the select, after the select
805 * and if the select returns EINTR. This is due to the fact
806 * that the selects called from async_processing can eat an EINTR
807 * caused by a signal (we can't take the break message there).
808 * This is hideously complex - *MUST* be simplified for 3.0 ! JRA.
811 if (oplock_message_waiting()) {
812 DEBUG(10,("receive_message_or_smb: oplock_message is waiting.\n"));
815 * After async processing we must go and do the select again, as
816 * the state of the flag in fds for the server file descriptor is
817 * indeterminate - we may have done I/O on it in the oplock processing. JRA.
819 return NT_STATUS_RETRY;
823 * Are there any timed events waiting ? If so, ensure we don't
824 * select for longer than it would take to wait for them.
831 event_add_to_select_args(smbd_event_context(), &now,
832 &r_fds, &w_fds, &to, &maxfd);
835 /* Process a signal and timed events now... */
836 if (run_events(smbd_event_context(), 0, NULL, NULL)) {
837 return NT_STATUS_RETRY;
842 START_PROFILE(smbd_idle);
844 selrtn = sys_select(maxfd+1,&r_fds,&w_fds,NULL,&to);
847 END_PROFILE(smbd_idle);
851 if (run_events(smbd_event_context(), selrtn, &r_fds, &w_fds)) {
852 return NT_STATUS_RETRY;
855 /* if we get EINTR then maybe we have received an oplock
856 signal - treat this as select returning 1. This is ugly, but
857 is the best we can do until the oplock code knows more about
859 if (selrtn == -1 && errno == EINTR) {
862 * After async processing we must go and do the select again, as
863 * the state of the flag in fds for the server file descriptor is
864 * indeterminate - we may have done I/O on it in the oplock processing. JRA.
866 return NT_STATUS_RETRY;
871 /* something is wrong. Maybe the socket is dead? */
872 return map_nt_error_from_unix(errno);
875 /* Did we timeout ? */
877 return NT_STATUS_RETRY;
880 /* should not be reached */
881 return NT_STATUS_INTERNAL_ERROR;
885 * Only allow 5 outstanding trans requests. We're allocating memory, so
889 NTSTATUS allow_new_trans(struct trans_state *list, int mid)
892 for (; list != NULL; list = list->next) {
894 if (list->mid == mid) {
895 return NT_STATUS_INVALID_PARAMETER;
901 return NT_STATUS_INSUFFICIENT_RESOURCES;
908 These flags determine some of the permissions required to do an operation
910 Note that I don't set NEED_WRITE on some write operations because they
911 are used by some brain-dead clients when printing, and I don't want to
912 force write permissions on print services.
914 #define AS_USER (1<<0)
915 #define NEED_WRITE (1<<1) /* Must be paired with AS_USER */
916 #define TIME_INIT (1<<2)
917 #define CAN_IPC (1<<3) /* Must be paired with AS_USER */
918 #define AS_GUEST (1<<5) /* Must *NOT* be paired with AS_USER */
919 #define DO_CHDIR (1<<6)
922 define a list of possible SMB messages and their corresponding
923 functions. Any message that has a NULL function is unimplemented -
924 please feel free to contribute implementations!
926 static const struct smb_message_struct {
928 void (*fn)(struct smb_request *req);
930 } smb_messages[256] = {
932 /* 0x00 */ { "SMBmkdir",reply_mkdir,AS_USER | NEED_WRITE},
933 /* 0x01 */ { "SMBrmdir",reply_rmdir,AS_USER | NEED_WRITE},
934 /* 0x02 */ { "SMBopen",reply_open,AS_USER },
935 /* 0x03 */ { "SMBcreate",reply_mknew,AS_USER},
936 /* 0x04 */ { "SMBclose",reply_close,AS_USER | CAN_IPC },
937 /* 0x05 */ { "SMBflush",reply_flush,AS_USER},
938 /* 0x06 */ { "SMBunlink",reply_unlink,AS_USER | NEED_WRITE },
939 /* 0x07 */ { "SMBmv",reply_mv,AS_USER | NEED_WRITE },
940 /* 0x08 */ { "SMBgetatr",reply_getatr,AS_USER},
941 /* 0x09 */ { "SMBsetatr",reply_setatr,AS_USER | NEED_WRITE},
942 /* 0x0a */ { "SMBread",reply_read,AS_USER},
943 /* 0x0b */ { "SMBwrite",reply_write,AS_USER | CAN_IPC },
944 /* 0x0c */ { "SMBlock",reply_lock,AS_USER},
945 /* 0x0d */ { "SMBunlock",reply_unlock,AS_USER},
946 /* 0x0e */ { "SMBctemp",reply_ctemp,AS_USER },
947 /* 0x0f */ { "SMBmknew",reply_mknew,AS_USER},
948 /* 0x10 */ { "SMBcheckpath",reply_checkpath,AS_USER},
949 /* 0x11 */ { "SMBexit",reply_exit,DO_CHDIR},
950 /* 0x12 */ { "SMBlseek",reply_lseek,AS_USER},
951 /* 0x13 */ { "SMBlockread",reply_lockread,AS_USER},
952 /* 0x14 */ { "SMBwriteunlock",reply_writeunlock,AS_USER},
953 /* 0x15 */ { NULL, NULL, 0 },
954 /* 0x16 */ { NULL, NULL, 0 },
955 /* 0x17 */ { NULL, NULL, 0 },
956 /* 0x18 */ { NULL, NULL, 0 },
957 /* 0x19 */ { NULL, NULL, 0 },
958 /* 0x1a */ { "SMBreadbraw",reply_readbraw,AS_USER},
959 /* 0x1b */ { "SMBreadBmpx",reply_readbmpx,AS_USER},
960 /* 0x1c */ { "SMBreadBs",reply_readbs,AS_USER },
961 /* 0x1d */ { "SMBwritebraw",reply_writebraw,AS_USER},
962 /* 0x1e */ { "SMBwriteBmpx",reply_writebmpx,AS_USER},
963 /* 0x1f */ { "SMBwriteBs",reply_writebs,AS_USER},
964 /* 0x20 */ { "SMBwritec", NULL,0},
965 /* 0x21 */ { NULL, NULL, 0 },
966 /* 0x22 */ { "SMBsetattrE",reply_setattrE,AS_USER | NEED_WRITE },
967 /* 0x23 */ { "SMBgetattrE",reply_getattrE,AS_USER },
968 /* 0x24 */ { "SMBlockingX",reply_lockingX,AS_USER },
969 /* 0x25 */ { "SMBtrans",reply_trans,AS_USER | CAN_IPC },
970 /* 0x26 */ { "SMBtranss",reply_transs,AS_USER | CAN_IPC},
971 /* 0x27 */ { "SMBioctl",reply_ioctl,0},
972 /* 0x28 */ { "SMBioctls", NULL,AS_USER},
973 /* 0x29 */ { "SMBcopy",reply_copy,AS_USER | NEED_WRITE },
974 /* 0x2a */ { "SMBmove", NULL,AS_USER | NEED_WRITE },
975 /* 0x2b */ { "SMBecho",reply_echo,0},
976 /* 0x2c */ { "SMBwriteclose",reply_writeclose,AS_USER},
977 /* 0x2d */ { "SMBopenX",reply_open_and_X,AS_USER | CAN_IPC },
978 /* 0x2e */ { "SMBreadX",reply_read_and_X,AS_USER | CAN_IPC },
979 /* 0x2f */ { "SMBwriteX",reply_write_and_X,AS_USER | CAN_IPC },
980 /* 0x30 */ { NULL, NULL, 0 },
981 /* 0x31 */ { NULL, NULL, 0 },
982 /* 0x32 */ { "SMBtrans2",reply_trans2, AS_USER | CAN_IPC },
983 /* 0x33 */ { "SMBtranss2",reply_transs2, AS_USER},
984 /* 0x34 */ { "SMBfindclose",reply_findclose,AS_USER},
985 /* 0x35 */ { "SMBfindnclose",reply_findnclose,AS_USER},
986 /* 0x36 */ { NULL, NULL, 0 },
987 /* 0x37 */ { NULL, NULL, 0 },
988 /* 0x38 */ { NULL, NULL, 0 },
989 /* 0x39 */ { NULL, NULL, 0 },
990 /* 0x3a */ { NULL, NULL, 0 },
991 /* 0x3b */ { NULL, NULL, 0 },
992 /* 0x3c */ { NULL, NULL, 0 },
993 /* 0x3d */ { NULL, NULL, 0 },
994 /* 0x3e */ { NULL, NULL, 0 },
995 /* 0x3f */ { NULL, NULL, 0 },
996 /* 0x40 */ { NULL, NULL, 0 },
997 /* 0x41 */ { NULL, NULL, 0 },
998 /* 0x42 */ { NULL, NULL, 0 },
999 /* 0x43 */ { NULL, NULL, 0 },
1000 /* 0x44 */ { NULL, NULL, 0 },
1001 /* 0x45 */ { NULL, NULL, 0 },
1002 /* 0x46 */ { NULL, NULL, 0 },
1003 /* 0x47 */ { NULL, NULL, 0 },
1004 /* 0x48 */ { NULL, NULL, 0 },
1005 /* 0x49 */ { NULL, NULL, 0 },
1006 /* 0x4a */ { NULL, NULL, 0 },
1007 /* 0x4b */ { NULL, NULL, 0 },
1008 /* 0x4c */ { NULL, NULL, 0 },
1009 /* 0x4d */ { NULL, NULL, 0 },
1010 /* 0x4e */ { NULL, NULL, 0 },
1011 /* 0x4f */ { NULL, NULL, 0 },
1012 /* 0x50 */ { NULL, NULL, 0 },
1013 /* 0x51 */ { NULL, NULL, 0 },
1014 /* 0x52 */ { NULL, NULL, 0 },
1015 /* 0x53 */ { NULL, NULL, 0 },
1016 /* 0x54 */ { NULL, NULL, 0 },
1017 /* 0x55 */ { NULL, NULL, 0 },
1018 /* 0x56 */ { NULL, NULL, 0 },
1019 /* 0x57 */ { NULL, NULL, 0 },
1020 /* 0x58 */ { NULL, NULL, 0 },
1021 /* 0x59 */ { NULL, NULL, 0 },
1022 /* 0x5a */ { NULL, NULL, 0 },
1023 /* 0x5b */ { NULL, NULL, 0 },
1024 /* 0x5c */ { NULL, NULL, 0 },
1025 /* 0x5d */ { NULL, NULL, 0 },
1026 /* 0x5e */ { NULL, NULL, 0 },
1027 /* 0x5f */ { NULL, NULL, 0 },
1028 /* 0x60 */ { NULL, NULL, 0 },
1029 /* 0x61 */ { NULL, NULL, 0 },
1030 /* 0x62 */ { NULL, NULL, 0 },
1031 /* 0x63 */ { NULL, NULL, 0 },
1032 /* 0x64 */ { NULL, NULL, 0 },
1033 /* 0x65 */ { NULL, NULL, 0 },
1034 /* 0x66 */ { NULL, NULL, 0 },
1035 /* 0x67 */ { NULL, NULL, 0 },
1036 /* 0x68 */ { NULL, NULL, 0 },
1037 /* 0x69 */ { NULL, NULL, 0 },
1038 /* 0x6a */ { NULL, NULL, 0 },
1039 /* 0x6b */ { NULL, NULL, 0 },
1040 /* 0x6c */ { NULL, NULL, 0 },
1041 /* 0x6d */ { NULL, NULL, 0 },
1042 /* 0x6e */ { NULL, NULL, 0 },
1043 /* 0x6f */ { NULL, NULL, 0 },
1044 /* 0x70 */ { "SMBtcon",reply_tcon,0},
1045 /* 0x71 */ { "SMBtdis",reply_tdis,DO_CHDIR},
1046 /* 0x72 */ { "SMBnegprot",reply_negprot,0},
1047 /* 0x73 */ { "SMBsesssetupX",reply_sesssetup_and_X,0},
1048 /* 0x74 */ { "SMBulogoffX",reply_ulogoffX, 0}, /* ulogoff doesn't give a valid TID */
1049 /* 0x75 */ { "SMBtconX",reply_tcon_and_X,0},
1050 /* 0x76 */ { NULL, NULL, 0 },
1051 /* 0x77 */ { NULL, NULL, 0 },
1052 /* 0x78 */ { NULL, NULL, 0 },
1053 /* 0x79 */ { NULL, NULL, 0 },
1054 /* 0x7a */ { NULL, NULL, 0 },
1055 /* 0x7b */ { NULL, NULL, 0 },
1056 /* 0x7c */ { NULL, NULL, 0 },
1057 /* 0x7d */ { NULL, NULL, 0 },
1058 /* 0x7e */ { NULL, NULL, 0 },
1059 /* 0x7f */ { NULL, NULL, 0 },
1060 /* 0x80 */ { "SMBdskattr",reply_dskattr,AS_USER},
1061 /* 0x81 */ { "SMBsearch",reply_search,AS_USER},
1062 /* 0x82 */ { "SMBffirst",reply_search,AS_USER},
1063 /* 0x83 */ { "SMBfunique",reply_search,AS_USER},
1064 /* 0x84 */ { "SMBfclose",reply_fclose,AS_USER},
1065 /* 0x85 */ { NULL, NULL, 0 },
1066 /* 0x86 */ { NULL, NULL, 0 },
1067 /* 0x87 */ { NULL, NULL, 0 },
1068 /* 0x88 */ { NULL, NULL, 0 },
1069 /* 0x89 */ { NULL, NULL, 0 },
1070 /* 0x8a */ { NULL, NULL, 0 },
1071 /* 0x8b */ { NULL, NULL, 0 },
1072 /* 0x8c */ { NULL, NULL, 0 },
1073 /* 0x8d */ { NULL, NULL, 0 },
1074 /* 0x8e */ { NULL, NULL, 0 },
1075 /* 0x8f */ { NULL, NULL, 0 },
1076 /* 0x90 */ { NULL, NULL, 0 },
1077 /* 0x91 */ { NULL, NULL, 0 },
1078 /* 0x92 */ { NULL, NULL, 0 },
1079 /* 0x93 */ { NULL, NULL, 0 },
1080 /* 0x94 */ { NULL, NULL, 0 },
1081 /* 0x95 */ { NULL, NULL, 0 },
1082 /* 0x96 */ { NULL, NULL, 0 },
1083 /* 0x97 */ { NULL, NULL, 0 },
1084 /* 0x98 */ { NULL, NULL, 0 },
1085 /* 0x99 */ { NULL, NULL, 0 },
1086 /* 0x9a */ { NULL, NULL, 0 },
1087 /* 0x9b */ { NULL, NULL, 0 },
1088 /* 0x9c */ { NULL, NULL, 0 },
1089 /* 0x9d */ { NULL, NULL, 0 },
1090 /* 0x9e */ { NULL, NULL, 0 },
1091 /* 0x9f */ { NULL, NULL, 0 },
1092 /* 0xa0 */ { "SMBnttrans",reply_nttrans, AS_USER | CAN_IPC },
1093 /* 0xa1 */ { "SMBnttranss",reply_nttranss, AS_USER | CAN_IPC },
1094 /* 0xa2 */ { "SMBntcreateX",reply_ntcreate_and_X, AS_USER | CAN_IPC },
1095 /* 0xa3 */ { NULL, NULL, 0 },
1096 /* 0xa4 */ { "SMBntcancel",reply_ntcancel, 0 },
1097 /* 0xa5 */ { "SMBntrename",reply_ntrename, AS_USER | NEED_WRITE },
1098 /* 0xa6 */ { NULL, NULL, 0 },
1099 /* 0xa7 */ { NULL, NULL, 0 },
1100 /* 0xa8 */ { NULL, NULL, 0 },
1101 /* 0xa9 */ { NULL, NULL, 0 },
1102 /* 0xaa */ { NULL, NULL, 0 },
1103 /* 0xab */ { NULL, NULL, 0 },
1104 /* 0xac */ { NULL, NULL, 0 },
1105 /* 0xad */ { NULL, NULL, 0 },
1106 /* 0xae */ { NULL, NULL, 0 },
1107 /* 0xaf */ { NULL, NULL, 0 },
1108 /* 0xb0 */ { NULL, NULL, 0 },
1109 /* 0xb1 */ { NULL, NULL, 0 },
1110 /* 0xb2 */ { NULL, NULL, 0 },
1111 /* 0xb3 */ { NULL, NULL, 0 },
1112 /* 0xb4 */ { NULL, NULL, 0 },
1113 /* 0xb5 */ { NULL, NULL, 0 },
1114 /* 0xb6 */ { NULL, NULL, 0 },
1115 /* 0xb7 */ { NULL, NULL, 0 },
1116 /* 0xb8 */ { NULL, NULL, 0 },
1117 /* 0xb9 */ { NULL, NULL, 0 },
1118 /* 0xba */ { NULL, NULL, 0 },
1119 /* 0xbb */ { NULL, NULL, 0 },
1120 /* 0xbc */ { NULL, NULL, 0 },
1121 /* 0xbd */ { NULL, NULL, 0 },
1122 /* 0xbe */ { NULL, NULL, 0 },
1123 /* 0xbf */ { NULL, NULL, 0 },
1124 /* 0xc0 */ { "SMBsplopen",reply_printopen,AS_USER},
1125 /* 0xc1 */ { "SMBsplwr",reply_printwrite,AS_USER},
1126 /* 0xc2 */ { "SMBsplclose",reply_printclose,AS_USER},
1127 /* 0xc3 */ { "SMBsplretq",reply_printqueue,AS_USER},
1128 /* 0xc4 */ { NULL, NULL, 0 },
1129 /* 0xc5 */ { NULL, NULL, 0 },
1130 /* 0xc6 */ { NULL, NULL, 0 },
1131 /* 0xc7 */ { NULL, NULL, 0 },
1132 /* 0xc8 */ { NULL, NULL, 0 },
1133 /* 0xc9 */ { NULL, NULL, 0 },
1134 /* 0xca */ { NULL, NULL, 0 },
1135 /* 0xcb */ { NULL, NULL, 0 },
1136 /* 0xcc */ { NULL, NULL, 0 },
1137 /* 0xcd */ { NULL, NULL, 0 },
1138 /* 0xce */ { NULL, NULL, 0 },
1139 /* 0xcf */ { NULL, NULL, 0 },
1140 /* 0xd0 */ { "SMBsends",reply_sends,AS_GUEST},
1141 /* 0xd1 */ { "SMBsendb", NULL,AS_GUEST},
1142 /* 0xd2 */ { "SMBfwdname", NULL,AS_GUEST},
1143 /* 0xd3 */ { "SMBcancelf", NULL,AS_GUEST},
1144 /* 0xd4 */ { "SMBgetmac", NULL,AS_GUEST},
1145 /* 0xd5 */ { "SMBsendstrt",reply_sendstrt,AS_GUEST},
1146 /* 0xd6 */ { "SMBsendend",reply_sendend,AS_GUEST},
1147 /* 0xd7 */ { "SMBsendtxt",reply_sendtxt,AS_GUEST},
1148 /* 0xd8 */ { NULL, NULL, 0 },
1149 /* 0xd9 */ { NULL, NULL, 0 },
1150 /* 0xda */ { NULL, NULL, 0 },
1151 /* 0xdb */ { NULL, NULL, 0 },
1152 /* 0xdc */ { NULL, NULL, 0 },
1153 /* 0xdd */ { NULL, NULL, 0 },
1154 /* 0xde */ { NULL, NULL, 0 },
1155 /* 0xdf */ { NULL, NULL, 0 },
1156 /* 0xe0 */ { NULL, NULL, 0 },
1157 /* 0xe1 */ { NULL, NULL, 0 },
1158 /* 0xe2 */ { NULL, NULL, 0 },
1159 /* 0xe3 */ { NULL, NULL, 0 },
1160 /* 0xe4 */ { NULL, NULL, 0 },
1161 /* 0xe5 */ { NULL, NULL, 0 },
1162 /* 0xe6 */ { NULL, NULL, 0 },
1163 /* 0xe7 */ { NULL, NULL, 0 },
1164 /* 0xe8 */ { NULL, NULL, 0 },
1165 /* 0xe9 */ { NULL, NULL, 0 },
1166 /* 0xea */ { NULL, NULL, 0 },
1167 /* 0xeb */ { NULL, NULL, 0 },
1168 /* 0xec */ { NULL, NULL, 0 },
1169 /* 0xed */ { NULL, NULL, 0 },
1170 /* 0xee */ { NULL, NULL, 0 },
1171 /* 0xef */ { NULL, NULL, 0 },
1172 /* 0xf0 */ { NULL, NULL, 0 },
1173 /* 0xf1 */ { NULL, NULL, 0 },
1174 /* 0xf2 */ { NULL, NULL, 0 },
1175 /* 0xf3 */ { NULL, NULL, 0 },
1176 /* 0xf4 */ { NULL, NULL, 0 },
1177 /* 0xf5 */ { NULL, NULL, 0 },
1178 /* 0xf6 */ { NULL, NULL, 0 },
1179 /* 0xf7 */ { NULL, NULL, 0 },
1180 /* 0xf8 */ { NULL, NULL, 0 },
1181 /* 0xf9 */ { NULL, NULL, 0 },
1182 /* 0xfa */ { NULL, NULL, 0 },
1183 /* 0xfb */ { NULL, NULL, 0 },
1184 /* 0xfc */ { NULL, NULL, 0 },
1185 /* 0xfd */ { NULL, NULL, 0 },
1186 /* 0xfe */ { NULL, NULL, 0 },
1187 /* 0xff */ { NULL, NULL, 0 }
1191 /*******************************************************************
1192 allocate and initialize a reply packet
1193 ********************************************************************/
1195 static bool create_outbuf(TALLOC_CTX *mem_ctx, struct smb_request *req,
1196 const char *inbuf, char **outbuf, uint8_t num_words,
1200 * Protect against integer wrap
1202 if ((num_bytes > 0xffffff)
1203 || ((num_bytes + smb_size + num_words*2) > 0xffffff)) {
1205 if (asprintf(&msg, "num_bytes too large: %u",
1206 (unsigned)num_bytes) == -1) {
1207 msg = CONST_DISCARD(char *, "num_bytes too large");
1212 *outbuf = TALLOC_ARRAY(mem_ctx, char,
1213 smb_size + num_words*2 + num_bytes);
1214 if (*outbuf == NULL) {
1218 construct_reply_common(req, inbuf, *outbuf);
1219 srv_set_message(*outbuf, num_words, num_bytes, false);
1221 * Zero out the word area, the caller has to take care of the bcc area
1224 if (num_words != 0) {
1225 memset(*outbuf + smb_vwv0, 0, num_words*2);
1231 void reply_outbuf(struct smb_request *req, uint8 num_words, uint32 num_bytes)
1234 if (!create_outbuf(req, req, (char *)req->inbuf, &outbuf, num_words,
1236 smb_panic("could not allocate output buffer\n");
1238 req->outbuf = (uint8_t *)outbuf;
1242 /*******************************************************************
1243 Dump a packet to a file.
1244 ********************************************************************/
1246 static void smb_dump(const char *name, int type, const char *data, ssize_t len)
1250 if (DEBUGLEVEL < 50) {
1254 if (len < 4) len = smb_len(data)+4;
1255 for (i=1;i<100;i++) {
1256 if (asprintf(&fname, "/tmp/%s.%d.%s", name, i,
1257 type ? "req" : "resp") == -1) {
1260 fd = open(fname, O_WRONLY|O_CREAT|O_EXCL, 0644);
1261 if (fd != -1 || errno != EEXIST) break;
1264 ssize_t ret = write(fd, data, len);
1266 DEBUG(0,("smb_dump: problem: write returned %d\n", (int)ret ));
1268 DEBUG(0,("created %s len %lu\n", fname, (unsigned long)len));
1273 /****************************************************************************
1274 Prepare everything for calling the actual request function, and potentially
1275 call the request function via the "new" interface.
1277 Return False if the "legacy" function needs to be called, everything is
1280 Return True if we're done.
1282 I know this API sucks, but it is the one with the least code change I could
1284 ****************************************************************************/
1286 static connection_struct *switch_message(uint8 type, struct smb_request *req, int size)
1290 connection_struct *conn = NULL;
1294 /* Make sure this is an SMB packet. smb_size contains NetBIOS header
1295 * so subtract 4 from it. */
1296 if (!valid_smb_header(req->inbuf)
1297 || (size < (smb_size - 4))) {
1298 DEBUG(2,("Non-SMB packet of length %d. Terminating server\n",
1299 smb_len(req->inbuf)));
1300 exit_server_cleanly("Non-SMB packet");
1303 if (smb_messages[type].fn == NULL) {
1304 DEBUG(0,("Unknown message type %d!\n",type));
1305 smb_dump("Unknown", 1, (char *)req->inbuf, size);
1306 reply_unknown_new(req, type);
1310 flags = smb_messages[type].flags;
1312 /* In share mode security we must ignore the vuid. */
1313 session_tag = (lp_security() == SEC_SHARE)
1314 ? UID_FIELD_INVALID : req->vuid;
1317 DEBUG(3,("switch message %s (pid %d) conn 0x%lx\n", smb_fn_name(type),
1318 (int)sys_getpid(), (unsigned long)conn));
1320 smb_dump(smb_fn_name(type), 1, (char *)req->inbuf, size);
1322 /* Ensure this value is replaced in the incoming packet. */
1323 SSVAL(req->inbuf,smb_uid,session_tag);
1326 * Ensure the correct username is in current_user_info. This is a
1327 * really ugly bugfix for problems with multiple session_setup_and_X's
1328 * being done and allowing %U and %G substitutions to work correctly.
1329 * There is a reason this code is done here, don't move it unless you
1330 * know what you're doing... :-).
1334 if (session_tag != last_session_tag) {
1335 user_struct *vuser = NULL;
1337 last_session_tag = session_tag;
1338 if(session_tag != UID_FIELD_INVALID) {
1339 vuser = get_valid_user_struct(session_tag);
1341 set_current_user_info(
1342 vuser->server_info->sanitized_username,
1343 vuser->server_info->unix_name,
1344 pdb_get_domain(vuser->server_info
1350 /* Does this call need to be run as the connected user? */
1351 if (flags & AS_USER) {
1353 /* Does this call need a valid tree connection? */
1356 * Amazingly, the error code depends on the command
1359 if (type == SMBntcreateX) {
1360 reply_nterror(req, NT_STATUS_INVALID_HANDLE);
1362 reply_doserror(req, ERRSRV, ERRinvnid);
1367 if (!change_to_user(conn,session_tag)) {
1368 reply_nterror(req, NT_STATUS_DOS(ERRSRV, ERRbaduid));
1369 remove_deferred_open_smb_message(req->mid);
1373 /* All NEED_WRITE and CAN_IPC flags must also have AS_USER. */
1375 /* Does it need write permission? */
1376 if ((flags & NEED_WRITE) && !CAN_WRITE(conn)) {
1377 reply_nterror(req, NT_STATUS_MEDIA_WRITE_PROTECTED);
1381 /* IPC services are limited */
1382 if (IS_IPC(conn) && !(flags & CAN_IPC)) {
1383 reply_doserror(req, ERRSRV,ERRaccess);
1387 /* This call needs to be run as root */
1388 change_to_root_user();
1391 /* load service specific parameters */
1393 if (req->encrypted) {
1394 conn->encrypted_tid = true;
1395 /* encrypted required from now on. */
1396 conn->encrypt_level = Required;
1397 } else if (ENCRYPTION_REQUIRED(conn)) {
1398 if (req->cmd != SMBtrans2 && req->cmd != SMBtranss2) {
1399 exit_server_cleanly("encryption required "
1405 if (!set_current_service(conn,SVAL(req->inbuf,smb_flg),
1406 (flags & (AS_USER|DO_CHDIR)
1408 reply_doserror(req, ERRSRV, ERRaccess);
1411 conn->num_smb_operations++;
1414 /* does this protocol need to be run as guest? */
1415 if ((flags & AS_GUEST)
1416 && (!change_to_guest() ||
1417 !check_access(smbd_server_fd(), lp_hostsallow(-1),
1418 lp_hostsdeny(-1)))) {
1419 reply_doserror(req, ERRSRV, ERRaccess);
1423 smb_messages[type].fn(req);
1427 /****************************************************************************
1428 Construct a reply to the incoming packet.
1429 ****************************************************************************/
1431 static void construct_reply(char *inbuf, int size, size_t unread_bytes, bool encrypted)
1433 connection_struct *conn;
1434 struct smb_request *req;
1438 if (!(req = talloc(talloc_tos(), struct smb_request))) {
1439 smb_panic("could not allocate smb_request");
1441 init_smb_request(req, (uint8 *)inbuf, unread_bytes, encrypted);
1442 req->inbuf = (uint8_t *)talloc_move(req, &inbuf);
1444 conn = switch_message(req->cmd, req, size);
1446 if (req->unread_bytes) {
1447 /* writeX failed. drain socket. */
1448 if (drain_socket(smbd_server_fd(), req->unread_bytes) !=
1449 req->unread_bytes) {
1450 smb_panic("failed to drain pending bytes");
1452 req->unread_bytes = 0;
1455 if (req->outbuf == NULL) {
1459 if (CVAL(req->outbuf,0) == 0) {
1460 show_msg((char *)req->outbuf);
1463 if (!srv_send_smb(smbd_server_fd(),
1464 (char *)req->outbuf,
1465 IS_CONN_ENCRYPTED(conn)||req->encrypted)) {
1466 exit_server_cleanly("construct_reply: srv_send_smb failed.");
1474 /****************************************************************************
1475 Process an smb from the client
1476 ****************************************************************************/
1478 static void process_smb(struct smbd_server_connection *conn,
1479 uint8_t *inbuf, size_t nread, size_t unread_bytes,
1482 int msg_type = CVAL(inbuf,0);
1484 DO_PROFILE_INC(smb_count);
1486 DEBUG( 6, ( "got message type 0x%x of len 0x%x\n", msg_type,
1488 DEBUG( 3, ( "Transaction %d of length %d (%u toread)\n", trans_num,
1490 (unsigned int)unread_bytes ));
1492 if (msg_type != 0) {
1494 * NetBIOS session request, keepalive, etc.
1496 reply_special((char *)inbuf);
1500 show_msg((char *)inbuf);
1502 construct_reply((char *)inbuf,nread,unread_bytes,encrypted);
1507 conn->num_requests++;
1509 /* The timeout_processing function isn't run nearly
1510 often enough to implement 'max log size' without
1511 overrunning the size of the file by many megabytes.
1512 This is especially true if we are running at debug
1513 level 10. Checking every 50 SMBs is a nice
1514 tradeoff of performance vs log file size overrun. */
1516 if ((conn->num_requests % 50) == 0 &&
1517 need_to_check_log_size()) {
1518 change_to_root_user();
1523 /****************************************************************************
1524 Return a string containing the function name of a SMB command.
1525 ****************************************************************************/
1527 const char *smb_fn_name(int type)
1529 const char *unknown_name = "SMBunknown";
1531 if (smb_messages[type].name == NULL)
1532 return(unknown_name);
1534 return(smb_messages[type].name);
1537 /****************************************************************************
1538 Helper functions for contruct_reply.
1539 ****************************************************************************/
1541 void add_to_common_flags2(uint32 v)
1546 void remove_from_common_flags2(uint32 v)
1548 common_flags2 &= ~v;
1551 static void construct_reply_common(struct smb_request *req, const char *inbuf,
1554 srv_set_message(outbuf,0,0,false);
1556 SCVAL(outbuf, smb_com, req->cmd);
1557 SIVAL(outbuf,smb_rcls,0);
1558 SCVAL(outbuf,smb_flg, FLAG_REPLY | (CVAL(inbuf,smb_flg) & FLAG_CASELESS_PATHNAMES));
1559 SSVAL(outbuf,smb_flg2,
1560 (SVAL(inbuf,smb_flg2) & FLAGS2_UNICODE_STRINGS) |
1562 memset(outbuf+smb_pidhigh,'\0',(smb_tid-smb_pidhigh));
1564 SSVAL(outbuf,smb_tid,SVAL(inbuf,smb_tid));
1565 SSVAL(outbuf,smb_pid,SVAL(inbuf,smb_pid));
1566 SSVAL(outbuf,smb_uid,SVAL(inbuf,smb_uid));
1567 SSVAL(outbuf,smb_mid,SVAL(inbuf,smb_mid));
1570 void construct_reply_common_req(struct smb_request *req, char *outbuf)
1572 construct_reply_common(req, (char *)req->inbuf, outbuf);
1576 * How many bytes have we already accumulated up to the current wct field
1580 size_t req_wct_ofs(struct smb_request *req)
1584 if (req->chain_outbuf == NULL) {
1587 buf_size = talloc_get_size(req->chain_outbuf);
1588 if ((buf_size % 4) != 0) {
1589 buf_size += (4 - (buf_size % 4));
1591 return buf_size - 4;
1595 * Hack around reply_nterror & friends not being aware of chained requests,
1596 * generating illegal (i.e. wct==0) chain replies.
1599 static void fixup_chain_error_packet(struct smb_request *req)
1601 uint8_t *outbuf = req->outbuf;
1603 reply_outbuf(req, 2, 0);
1604 memcpy(req->outbuf, outbuf, smb_wct);
1605 TALLOC_FREE(outbuf);
1606 SCVAL(req->outbuf, smb_vwv0, 0xff);
1609 /****************************************************************************
1610 Construct a chained reply and add it to the already made reply
1611 ****************************************************************************/
1613 void chain_reply(struct smb_request *req)
1615 size_t smblen = smb_len(req->inbuf);
1616 size_t already_used, length_needed;
1618 uint32_t chain_offset; /* uint32_t to avoid overflow */
1625 if (IVAL(req->outbuf, smb_rcls) != 0) {
1626 fixup_chain_error_packet(req);
1630 * Any of the AndX requests and replies have at least a wct of
1631 * 2. vwv[0] is the next command, vwv[1] is the offset from the
1632 * beginning of the SMB header to the next wct field.
1634 * None of the AndX requests put anything valuable in vwv[0] and [1],
1635 * so we can overwrite it here to form the chain.
1638 if ((req->wct < 2) || (CVAL(req->outbuf, smb_wct) < 2)) {
1643 * Here we assume that this is the end of the chain. For that we need
1644 * to set "next command" to 0xff and the offset to 0. If we later find
1645 * more commands in the chain, this will be overwritten again.
1648 SCVAL(req->outbuf, smb_vwv0, 0xff);
1649 SCVAL(req->outbuf, smb_vwv0+1, 0);
1650 SSVAL(req->outbuf, smb_vwv1, 0);
1652 if (req->chain_outbuf == NULL) {
1654 * In req->chain_outbuf we collect all the replies. Start the
1655 * chain by copying in the first reply.
1657 * We do the realloc because later on we depend on
1658 * talloc_get_size to determine the length of
1659 * chain_outbuf. The reply_xxx routines might have
1660 * over-allocated (reply_pipe_read_and_X used to be such an
1663 req->chain_outbuf = TALLOC_REALLOC_ARRAY(
1664 req, req->outbuf, uint8_t, smb_len(req->outbuf) + 4);
1665 if (req->chain_outbuf == NULL) {
1670 if (!smb_splice_chain(&req->chain_outbuf,
1671 CVAL(req->outbuf, smb_com),
1672 CVAL(req->outbuf, smb_wct),
1673 (uint16_t *)(req->outbuf + smb_vwv),
1674 0, smb_buflen(req->outbuf),
1675 (uint8_t *)smb_buf(req->outbuf))) {
1678 TALLOC_FREE(req->outbuf);
1682 * We use the old request's vwv field to grab the next chained command
1683 * and offset into the chained fields.
1686 chain_cmd = CVAL(req->vwv+0, 0);
1687 chain_offset = SVAL(req->vwv+1, 0);
1689 if (chain_cmd == 0xff) {
1691 * End of chain, no more requests from the client. So ship the
1694 smb_setlen((char *)(req->chain_outbuf),
1695 talloc_get_size(req->chain_outbuf) - 4);
1696 if (!srv_send_smb(smbd_server_fd(), (char *)req->chain_outbuf,
1697 IS_CONN_ENCRYPTED(req->conn)
1698 ||req->encrypted)) {
1699 exit_server_cleanly("chain_reply: srv_send_smb "
1706 * Check if the client tries to fool us. The request so far uses the
1707 * space to the end of the byte buffer in the request just
1708 * processed. The chain_offset can't point into that area. If that was
1709 * the case, we could end up with an endless processing of the chain,
1710 * we would always handle the same request.
1713 already_used = PTR_DIFF(req->buf+req->buflen, smb_base(req->inbuf));
1714 if (chain_offset < already_used) {
1719 * Next check: Make sure the chain offset does not point beyond the
1720 * overall smb request length.
1723 length_needed = chain_offset+1; /* wct */
1724 if (length_needed > smblen) {
1729 * Now comes the pointer magic. Goal here is to set up req->vwv and
1730 * req->buf correctly again to be able to call the subsequent
1731 * switch_message(). The chain offset (the former vwv[1]) points at
1732 * the new wct field.
1735 wct = CVAL(smb_base(req->inbuf), chain_offset);
1738 * Next consistency check: Make the new vwv array fits in the overall
1742 length_needed += (wct+1)*sizeof(uint16_t); /* vwv+buflen */
1743 if (length_needed > smblen) {
1746 vwv = (uint16_t *)(smb_base(req->inbuf) + chain_offset + 1);
1749 * Now grab the new byte buffer....
1752 buflen = SVAL(vwv+wct, 0);
1755 * .. and check that it fits.
1758 length_needed += buflen;
1759 if (length_needed > smblen) {
1762 buf = (uint8_t *)(vwv+wct+1);
1764 req->cmd = chain_cmd;
1767 req->buflen = buflen;
1770 switch_message(chain_cmd, req, smblen);
1772 if (req->outbuf == NULL) {
1774 * This happens if the chained command has suspended itself or
1775 * if it has called srv_send_smb() itself.
1781 * We end up here if the chained command was not itself chained or
1782 * suspended, but for example a close() command. We now need to splice
1783 * the chained commands' outbuf into the already built up chain_outbuf
1784 * and ship the result.
1790 * We end up here if there's any error in the chain syntax. Report a
1791 * DOS error, just like Windows does.
1793 reply_nterror(req, NT_STATUS_DOS(ERRSRV, ERRerror));
1794 fixup_chain_error_packet(req);
1797 if (!smb_splice_chain(&req->chain_outbuf,
1798 CVAL(req->outbuf, smb_com),
1799 CVAL(req->outbuf, smb_wct),
1800 (uint16_t *)(req->outbuf + smb_vwv),
1801 0, smb_buflen(req->outbuf),
1802 (uint8_t *)smb_buf(req->outbuf))) {
1803 exit_server_cleanly("chain_reply: smb_splice_chain failed\n");
1805 TALLOC_FREE(req->outbuf);
1807 smb_setlen((char *)(req->chain_outbuf),
1808 talloc_get_size(req->chain_outbuf) - 4);
1810 show_msg((char *)(req->chain_outbuf));
1812 if (!srv_send_smb(smbd_server_fd(), (char *)req->chain_outbuf,
1813 IS_CONN_ENCRYPTED(req->conn)||req->encrypted)) {
1814 exit_server_cleanly("construct_reply: srv_send_smb failed.");
1818 /****************************************************************************
1819 Check if services need reloading.
1820 ****************************************************************************/
1822 void check_reload(time_t t)
1824 time_t printcap_cache_time = (time_t)lp_printcap_cache_time();
1826 if(last_smb_conf_reload_time == 0) {
1827 last_smb_conf_reload_time = t;
1828 /* Our printing subsystem might not be ready at smbd start up.
1829 Then no printer is available till the first printers check
1830 is performed. A lower initial interval circumvents this. */
1831 if ( printcap_cache_time > 60 )
1832 last_printer_reload_time = t - printcap_cache_time + 60;
1834 last_printer_reload_time = t;
1837 if (mypid != getpid()) { /* First time or fork happened meanwhile */
1838 /* randomize over 60 second the printcap reload to avoid all
1839 * process hitting cupsd at the same time */
1840 int time_range = 60;
1842 last_printer_reload_time += random() % time_range;
1846 if (t >= last_smb_conf_reload_time+SMBD_RELOAD_CHECK) {
1847 reload_services(True);
1848 last_smb_conf_reload_time = t;
1851 /* 'printcap cache time = 0' disable the feature */
1853 if ( printcap_cache_time != 0 )
1855 /* see if it's time to reload or if the clock has been set back */
1857 if ( (t >= last_printer_reload_time+printcap_cache_time)
1858 || (t-last_printer_reload_time < 0) )
1860 DEBUG( 3,( "Printcap cache time expired.\n"));
1862 last_printer_reload_time = t;
1867 static void smbd_server_connection_write_handler(struct smbd_server_connection *conn)
1869 /* TODO: make write nonblocking */
1872 static void smbd_server_connection_read_handler(struct smbd_server_connection *conn)
1874 uint8_t *inbuf = NULL;
1875 size_t inbuf_len = 0;
1876 size_t unread_bytes = 0;
1877 bool encrypted = false;
1878 TALLOC_CTX *mem_ctx = talloc_tos();
1881 /* TODO: make this completely nonblocking */
1883 status = receive_smb_talloc(mem_ctx, smbd_server_fd(),
1884 (char **)(void *)&inbuf,
1889 if (NT_STATUS_EQUAL(status, NT_STATUS_RETRY)) {
1892 if (NT_STATUS_IS_ERR(status)) {
1893 exit_server_cleanly("failed to receive smb request");
1895 if (!NT_STATUS_IS_OK(status)) {
1900 process_smb(conn, inbuf, inbuf_len, unread_bytes, encrypted);
1903 static void smbd_server_connection_handler(struct event_context *ev,
1904 struct fd_event *fde,
1908 struct smbd_server_connection *conn = talloc_get_type(private_data,
1909 struct smbd_server_connection);
1911 if (flags & EVENT_FD_WRITE) {
1912 smbd_server_connection_write_handler(conn);
1913 } else if (flags & EVENT_FD_READ) {
1914 smbd_server_connection_read_handler(conn);
1919 /****************************************************************************
1920 received when we should release a specific IP
1921 ****************************************************************************/
1922 static void release_ip(const char *ip, void *priv)
1924 char addr[INET6_ADDRSTRLEN];
1926 if (strcmp(client_socket_addr(get_client_fd(),addr,sizeof(addr)), ip) == 0) {
1927 /* we can't afford to do a clean exit - that involves
1928 database writes, which would potentially mean we
1929 are still running after the failover has finished -
1930 we have to get rid of this process ID straight
1932 DEBUG(0,("Got release IP message for our IP %s - exiting immediately\n",
1934 /* note we must exit with non-zero status so the unclean handler gets
1935 called in the parent, so that the brl database is tickled */
1940 static void msg_release_ip(struct messaging_context *msg_ctx, void *private_data,
1941 uint32_t msg_type, struct server_id server_id, DATA_BLOB *data)
1943 release_ip((char *)data->data, NULL);
1946 #ifdef CLUSTER_SUPPORT
1947 static int client_get_tcp_info(struct sockaddr_storage *server,
1948 struct sockaddr_storage *client)
1951 if (server_fd == -1) {
1954 length = sizeof(*server);
1955 if (getsockname(server_fd, (struct sockaddr *)server, &length) != 0) {
1958 length = sizeof(*client);
1959 if (getpeername(server_fd, (struct sockaddr *)client, &length) != 0) {
1967 * Send keepalive packets to our client
1969 static bool keepalive_fn(const struct timeval *now, void *private_data)
1971 if (!send_keepalive(smbd_server_fd())) {
1972 DEBUG( 2, ( "Keepalive failed - exiting.\n" ) );
1979 * Do the recurring check if we're idle
1981 static bool deadtime_fn(const struct timeval *now, void *private_data)
1983 if ((conn_num_open() == 0)
1984 || (conn_idle_all(now->tv_sec))) {
1985 DEBUG( 2, ( "Closing idle connection\n" ) );
1986 messaging_send(smbd_messaging_context(), procid_self(),
1987 MSG_SHUTDOWN, &data_blob_null);
1995 * Do the recurring log file and smb.conf reload checks.
1998 static bool housekeeping_fn(const struct timeval *now, void *private_data)
2000 change_to_root_user();
2002 /* update printer queue caches if necessary */
2003 update_monitored_printq_cache();
2005 /* check if we need to reload services */
2006 check_reload(time(NULL));
2008 /* Change machine password if neccessary. */
2009 attempt_machine_password_change();
2012 * Force a log file check.
2014 force_check_log_size();
2019 /****************************************************************************
2020 Process commands from the client
2021 ****************************************************************************/
2023 void smbd_process(void)
2025 TALLOC_CTX *frame = talloc_stackframe();
2026 char remaddr[INET6_ADDRSTRLEN];
2028 smbd_server_conn = talloc_zero(smbd_event_context(), struct smbd_server_connection);
2029 if (!smbd_server_conn) {
2030 exit_server("failed to create smbd_server_connection");
2033 /* Ensure child is set to blocking mode */
2034 set_blocking(smbd_server_fd(),True);
2036 set_socket_options(smbd_server_fd(),"SO_KEEPALIVE");
2037 set_socket_options(smbd_server_fd(), lp_socket_options());
2039 /* this is needed so that we get decent entries
2040 in smbstatus for port 445 connects */
2041 set_remote_machine_name(get_peer_addr(smbd_server_fd(),
2045 reload_services(true);
2048 * Before the first packet, check the global hosts allow/ hosts deny
2049 * parameters before doing any parsing of packets passed to us by the
2050 * client. This prevents attacks on our parsing code from hosts not in
2051 * the hosts allow list.
2054 if (!check_access(smbd_server_fd(), lp_hostsallow(-1),
2055 lp_hostsdeny(-1))) {
2056 char addr[INET6_ADDRSTRLEN];
2059 * send a negative session response "not listening on calling
2062 unsigned char buf[5] = {0x83, 0, 0, 1, 0x81};
2063 DEBUG( 1, ("Connection denied from %s\n",
2064 client_addr(get_client_fd(),addr,sizeof(addr)) ) );
2065 (void)srv_send_smb(smbd_server_fd(),(char *)buf,false);
2066 exit_server_cleanly("connection denied");
2073 if (!init_account_policy()) {
2074 exit_server("Could not open account policy tdb.\n");
2077 if (*lp_rootdir()) {
2078 if (chroot(lp_rootdir()) != 0) {
2079 DEBUG(0,("Failed changed root to %s\n", lp_rootdir()));
2080 exit_server("Failed to chroot()");
2082 DEBUG(0,("Changed root to %s\n", lp_rootdir()));
2086 if (!init_oplocks(smbd_messaging_context()))
2087 exit_server("Failed to init oplocks");
2089 /* Setup aio signal handler. */
2090 initialize_async_io_handler();
2092 /* register our message handlers */
2093 messaging_register(smbd_messaging_context(), NULL,
2094 MSG_SMB_FORCE_TDIS, msg_force_tdis);
2095 messaging_register(smbd_messaging_context(), NULL,
2096 MSG_SMB_RELEASE_IP, msg_release_ip);
2097 messaging_register(smbd_messaging_context(), NULL,
2098 MSG_SMB_CLOSE_FILE, msg_close_file);
2100 if ((lp_keepalive() != 0)
2101 && !(event_add_idle(smbd_event_context(), NULL,
2102 timeval_set(lp_keepalive(), 0),
2103 "keepalive", keepalive_fn,
2105 DEBUG(0, ("Could not add keepalive event\n"));
2109 if (!(event_add_idle(smbd_event_context(), NULL,
2110 timeval_set(IDLE_CLOSED_TIMEOUT, 0),
2111 "deadtime", deadtime_fn, NULL))) {
2112 DEBUG(0, ("Could not add deadtime event\n"));
2116 if (!(event_add_idle(smbd_event_context(), NULL,
2117 timeval_set(SMBD_SELECT_TIMEOUT, 0),
2118 "housekeeping", housekeeping_fn, NULL))) {
2119 DEBUG(0, ("Could not add housekeeping event\n"));
2123 #ifdef CLUSTER_SUPPORT
2125 if (lp_clustering()) {
2127 * We need to tell ctdb about our client's TCP
2128 * connection, so that for failover ctdbd can send
2129 * tickle acks, triggering a reconnection by the
2133 struct sockaddr_storage srv, clnt;
2135 if (client_get_tcp_info(&srv, &clnt) == 0) {
2139 status = ctdbd_register_ips(
2140 messaging_ctdbd_connection(),
2141 &srv, &clnt, release_ip, NULL);
2143 if (!NT_STATUS_IS_OK(status)) {
2144 DEBUG(0, ("ctdbd_register_ips failed: %s\n",
2145 nt_errstr(status)));
2149 DEBUG(0,("Unable to get tcp info for "
2150 "CTDB_CONTROL_TCP_CLIENT: %s\n",
2157 max_recv = MIN(lp_maxxmit(),BUFFER_SIZE);
2159 smbd_server_conn->fde = event_add_fd(smbd_event_context(),
2163 smbd_server_connection_handler,
2165 if (!smbd_server_conn->fde) {
2166 exit_server("failed to create smbd_server_connection fde");
2174 frame = talloc_stackframe_pool(8192);
2178 status = smbd_server_connection_loop_once(smbd_server_conn);
2179 if (!NT_STATUS_EQUAL(status, NT_STATUS_RETRY) &&
2180 !NT_STATUS_IS_OK(status)) {
2181 DEBUG(3, ("smbd_server_connection_loop_once failed: %s,"
2182 " exiting\n", nt_errstr(status)));
2189 exit_server_cleanly(NULL);