source3/smbd/process.c

   1 /*
   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
   6
   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.
  11
  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.
  16
  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/>.
  19 */
  20
  21 #include "includes.h"
  22 #include "../lib/tsocket/tsocket.h"
  23 #include "system/filesys.h"
  24 #include "smbd/smbd.h"
  25 #include "smbd/globals.h"
  26 #include "librpc/gen_ndr/netlogon.h"
  27 #include "../lib/async_req/async_sock.h"
  28 #include "ctdbd_conn.h"
  29 #include "../lib/util/select.h"
  30 #include "printing/queue_process.h"
  31 #include "system/select.h"
  32 #include "passdb.h"
  33 #include "auth.h"
  34 #include "messages.h"
  35 #include "smbprofile.h"
  36 #include "rpc_server/spoolss/srv_spoolss_nt.h"
  37 #include "libsmb/libsmb.h"
  38 #include "../lib/util/tevent_ntstatus.h"
  39 #include "../libcli/security/dom_sid.h"
  40 #include "../libcli/security/security_token.h"
  41 #include "lib/id_cache.h"
  42
  43 extern bool global_machine_password_needs_changing;
  44
  45 /* Internal message queue for deferred opens. */
  46 struct pending_message_list {
  47         struct pending_message_list *next, *prev;
  48         struct timeval request_time; /* When was this first issued? */
  49         struct smbd_server_connection *sconn;
  50         struct timed_event *te;
  51         struct smb_perfcount_data pcd;
  52         uint32_t seqnum;
  53         bool encrypted;
  54         bool processed;
  55         DATA_BLOB buf;
  56         DATA_BLOB private_data;
  57 };
  58
  59 static void construct_reply_common(struct smb_request *req, const char *inbuf,
  60                                    char *outbuf);
  61 static struct pending_message_list *get_deferred_open_message_smb(
  62         struct smbd_server_connection *sconn, uint64_t mid);
  63
  64 static bool smbd_lock_socket_internal(struct smbd_server_connection *sconn)
  65 {
  66         bool ok;
  67
  68         if (sconn->smb1.echo_handler.socket_lock_fd == -1) {
  69                 return true;
  70         }
  71
  72         sconn->smb1.echo_handler.ref_count++;
  73
  74         if (sconn->smb1.echo_handler.ref_count > 1) {
  75                 return true;
  76         }
  77
  78         DEBUG(10,("pid[%d] wait for socket lock\n", (int)sys_getpid()));
  79
  80         do {
  81                 ok = fcntl_lock(
  82                         sconn->smb1.echo_handler.socket_lock_fd,
  83                         SMB_F_SETLKW, 0, 0, F_WRLCK);
  84         } while (!ok && (errno == EINTR));
  85
  86         if (!ok) {
  87                 DEBUG(1, ("fcntl_lock failed: %s\n", strerror(errno)));
  88                 return false;
  89         }
  90
  91         DEBUG(10,("pid[%d] got for socket lock\n", (int)sys_getpid()));
  92
  93         return true;
  94 }
  95
  96 void smbd_lock_socket(struct smbd_server_connection *sconn)
  97 {
  98         if (!smbd_lock_socket_internal(sconn)) {
  99                 exit_server_cleanly("failed to lock socket");
 100         }
 101 }
 102
 103 static bool smbd_unlock_socket_internal(struct smbd_server_connection *sconn)
 104 {
 105         bool ok;
 106
 107         if (sconn->smb1.echo_handler.socket_lock_fd == -1) {
 108                 return true;
 109         }
 110
 111         sconn->smb1.echo_handler.ref_count--;
 112
 113         if (sconn->smb1.echo_handler.ref_count > 0) {
 114                 return true;
 115         }
 116
 117         do {
 118                 ok = fcntl_lock(
 119                         sconn->smb1.echo_handler.socket_lock_fd,
 120                         SMB_F_SETLKW, 0, 0, F_UNLCK);
 121         } while (!ok && (errno == EINTR));
 122
 123         if (!ok) {
 124                 DEBUG(1, ("fcntl_lock failed: %s\n", strerror(errno)));
 125                 return false;
 126         }
 127
 128         DEBUG(10,("pid[%d] unlocked socket\n", (int)sys_getpid()));
 129
 130         return true;
 131 }
 132
 133 void smbd_unlock_socket(struct smbd_server_connection *sconn)
 134 {
 135         if (!smbd_unlock_socket_internal(sconn)) {
 136                 exit_server_cleanly("failed to unlock socket");
 137         }
 138 }
 139
 140 /* Accessor function for smb_read_error for smbd functions. */
 141
 142 /****************************************************************************
 143  Send an smb to a fd.
 144 ****************************************************************************/
 145
 146 bool srv_send_smb(struct smbd_server_connection *sconn, char *buffer,
 147                   bool do_signing, uint32_t seqnum,
 148                   bool do_encrypt,
 149                   struct smb_perfcount_data *pcd)
 150 {
 151         size_t len = 0;
 152         size_t nwritten=0;
 153         ssize_t ret;
 154         char *buf_out = buffer;
 155
 156         smbd_lock_socket(sconn);
 157
 158         if (do_signing) {
 159                 /* Sign the outgoing packet if required. */
 160                 srv_calculate_sign_mac(sconn, buf_out, seqnum);
 161         }
 162
 163         if (do_encrypt) {
 164                 NTSTATUS status = srv_encrypt_buffer(sconn, buffer, &buf_out);
 165                 if (!NT_STATUS_IS_OK(status)) {
 166                         DEBUG(0, ("send_smb: SMB encryption failed "
 167                                 "on outgoing packet! Error %s\n",
 168                                 nt_errstr(status) ));
 169                         goto out;
 170                 }
 171         }
 172
 173         len = smb_len(buf_out) + 4;
 174
 175         ret = write_data(sconn->sock, buf_out+nwritten, len - nwritten);
 176         if (ret <= 0) {
 177
 178                 char addr[INET6_ADDRSTRLEN];
 179                 /*
 180                  * Try and give an error message saying what
 181                  * client failed.
 182                  */
 183                 DEBUG(1,("pid[%d] Error writing %d bytes to client %s. %d. (%s)\n",
 184                          (int)sys_getpid(), (int)len,
 185                          get_peer_addr(sconn->sock, addr, sizeof(addr)),
 186                          (int)ret, strerror(errno) ));
 187
 188                 srv_free_enc_buffer(sconn, buf_out);
 189                 goto out;
 190         }
 191
 192         SMB_PERFCOUNT_SET_MSGLEN_OUT(pcd, len);
 193         srv_free_enc_buffer(sconn, buf_out);
 194 out:
 195         SMB_PERFCOUNT_END(pcd);
 196
 197         smbd_unlock_socket(sconn);
 198         return true;
 199 }
 200
 201 /*******************************************************************
 202  Setup the word count and byte count for a smb message.
 203 ********************************************************************/
 204
 205 int srv_set_message(char *buf,
 206                         int num_words,
 207                         int num_bytes,
 208                         bool zero)
 209 {
 210         if (zero && (num_words || num_bytes)) {
 211                 memset(buf + smb_size,'\0',num_words*2 + num_bytes);
 212         }
 213         SCVAL(buf,smb_wct,num_words);
 214         SSVAL(buf,smb_vwv + num_words*SIZEOFWORD,num_bytes);
 215         smb_setlen(buf,(smb_size + num_words*2 + num_bytes - 4));
 216         return (smb_size + num_words*2 + num_bytes);
 217 }
 218
 219 static bool valid_smb_header(struct smbd_server_connection *sconn,
 220                              const uint8_t *inbuf)
 221 {
 222         if (is_encrypted_packet(sconn, inbuf)) {
 223                 return true;
 224         }
 225         /*
 226          * This used to be (strncmp(smb_base(inbuf),"\377SMB",4) == 0)
 227          * but it just looks weird to call strncmp for this one.
 228          */
 229         return (IVAL(smb_base(inbuf), 0) == 0x424D53FF);
 230 }
 231
 232 /* Socket functions for smbd packet processing. */
 233
 234 static bool valid_packet_size(size_t len)
 235 {
 236         /*
 237          * A WRITEX with CAP_LARGE_WRITEX can be 64k worth of data plus 65 bytes
 238          * of header. Don't print the error if this fits.... JRA.
 239          */
 240
 241         if (len > (BUFFER_SIZE + LARGE_WRITEX_HDR_SIZE)) {
 242                 DEBUG(0,("Invalid packet length! (%lu bytes).\n",
 243                                         (unsigned long)len));
 244                 return false;
 245         }
 246         return true;
 247 }
 248
 249 static NTSTATUS read_packet_remainder(int fd, char *buffer,
 250                                       unsigned int timeout, ssize_t len)
 251 {
 252         NTSTATUS status;
 253
 254         if (len <= 0) {
 255                 return NT_STATUS_OK;
 256         }
 257
 258         status = read_fd_with_timeout(fd, buffer, len, len, timeout, NULL);
 259         if (!NT_STATUS_IS_OK(status)) {
 260                 char addr[INET6_ADDRSTRLEN];
 261                 DEBUG(0, ("read_fd_with_timeout failed for client %s read "
 262                           "error = %s.\n",
 263                           get_peer_addr(fd, addr, sizeof(addr)),
 264                           nt_errstr(status)));
 265         }
 266         return status;
 267 }
 268
 269 /****************************************************************************
 270  Attempt a zerocopy writeX read. We know here that len > smb_size-4
 271 ****************************************************************************/
 272
 273 /*
 274  * Unfortunately, earlier versions of smbclient/libsmbclient
 275  * don't send this "standard" writeX header. I've fixed this
 276  * for 3.2 but we'll use the old method with earlier versions.
 277  * Windows and CIFSFS at least use this standard size. Not
 278  * sure about MacOSX.
 279  */
 280
 281 #define STANDARD_WRITE_AND_X_HEADER_SIZE (smb_size - 4 + /* basic header */ \
 282                                 (2*14) + /* word count (including bcc) */ \
 283                                 1 /* pad byte */)
 284
 285 static NTSTATUS receive_smb_raw_talloc_partial_read(TALLOC_CTX *mem_ctx,
 286                                                     const char lenbuf[4],
 287                                                     struct smbd_server_connection *sconn,
 288                                                     int sock,
 289                                                     char **buffer,
 290                                                     unsigned int timeout,
 291                                                     size_t *p_unread,
 292                                                     size_t *len_ret)
 293 {
 294         /* Size of a WRITEX call (+4 byte len). */
 295         char writeX_header[4 + STANDARD_WRITE_AND_X_HEADER_SIZE];
 296         ssize_t len = smb_len_large(lenbuf); /* Could be a UNIX large writeX. */
 297         ssize_t toread;
 298         NTSTATUS status;
 299
 300         memcpy(writeX_header, lenbuf, 4);
 301
 302         status = read_fd_with_timeout(
 303                 sock, writeX_header + 4,
 304                 STANDARD_WRITE_AND_X_HEADER_SIZE,
 305                 STANDARD_WRITE_AND_X_HEADER_SIZE,
 306                 timeout, NULL);
 307
 308         if (!NT_STATUS_IS_OK(status)) {
 309                 DEBUG(0, ("read_fd_with_timeout failed for client %s read "
 310                           "error = %s.\n",
 311                           tsocket_address_string(sconn->remote_address,
 312                                                  talloc_tos()),
 313                           nt_errstr(status)));
 314                 return status;
 315         }
 316
 317         /*
 318          * Ok - now try and see if this is a possible
 319          * valid writeX call.
 320          */
 321
 322         if (is_valid_writeX_buffer(sconn, (uint8_t *)writeX_header)) {
 323                 /*
 324                  * If the data offset is beyond what
 325                  * we've read, drain the extra bytes.
 326                  */
 327                 uint16_t doff = SVAL(writeX_header,smb_vwv11);
 328                 ssize_t newlen;
 329
 330                 if (doff > STANDARD_WRITE_AND_X_HEADER_SIZE) {
 331                         size_t drain = doff - STANDARD_WRITE_AND_X_HEADER_SIZE;
 332                         if (drain_socket(sock, drain) != drain) {
 333                                 smb_panic("receive_smb_raw_talloc_partial_read:"
 334                                         " failed to drain pending bytes");
 335                         }
 336                 } else {
 337                         doff = STANDARD_WRITE_AND_X_HEADER_SIZE;
 338                 }
 339
 340                 /* Spoof down the length and null out the bcc. */
 341                 set_message_bcc(writeX_header, 0);
 342                 newlen = smb_len(writeX_header);
 343
 344                 /* Copy the header we've written. */
 345
 346                 *buffer = (char *)talloc_memdup(mem_ctx,
 347                                 writeX_header,
 348                                 sizeof(writeX_header));
 349
 350                 if (*buffer == NULL) {
 351                         DEBUG(0, ("Could not allocate inbuf of length %d\n",
 352                                   (int)sizeof(writeX_header)));
 353                         return NT_STATUS_NO_MEMORY;
 354                 }
 355
 356                 /* Work out the remaining bytes. */
 357                 *p_unread = len - STANDARD_WRITE_AND_X_HEADER_SIZE;
 358                 *len_ret = newlen + 4;
 359                 return NT_STATUS_OK;
 360         }
 361
 362         if (!valid_packet_size(len)) {
 363                 return NT_STATUS_INVALID_PARAMETER;
 364         }
 365
 366         /*
 367          * Not a valid writeX call. Just do the standard
 368          * talloc and return.
 369          */
 370
 371         *buffer = talloc_array(mem_ctx, char, len+4);
 372
 373         if (*buffer == NULL) {
 374                 DEBUG(0, ("Could not allocate inbuf of length %d\n",
 375                           (int)len+4));
 376                 return NT_STATUS_NO_MEMORY;
 377         }
 378
 379         /* Copy in what we already read. */
 380         memcpy(*buffer,
 381                 writeX_header,
 382                 4 + STANDARD_WRITE_AND_X_HEADER_SIZE);
 383         toread = len - STANDARD_WRITE_AND_X_HEADER_SIZE;
 384
 385         if(toread > 0) {
 386                 status = read_packet_remainder(
 387                         sock,
 388                         (*buffer) + 4 + STANDARD_WRITE_AND_X_HEADER_SIZE,
 389                         timeout, toread);
 390
 391                 if (!NT_STATUS_IS_OK(status)) {
 392                         DEBUG(10, ("receive_smb_raw_talloc_partial_read: %s\n",
 393                                    nt_errstr(status)));
 394                         return status;
 395                 }
 396         }
 397
 398         *len_ret = len + 4;
 399         return NT_STATUS_OK;
 400 }
 401
 402 static NTSTATUS receive_smb_raw_talloc(TALLOC_CTX *mem_ctx,
 403                                        struct smbd_server_connection *sconn,
 404                                        int sock,
 405                                        char **buffer, unsigned int timeout,
 406                                        size_t *p_unread, size_t *plen)
 407 {
 408         char lenbuf[4];
 409         size_t len;
 410         int min_recv_size = lp_min_receive_file_size();
 411         NTSTATUS status;
 412
 413         *p_unread = 0;
 414
 415         status = read_smb_length_return_keepalive(sock, lenbuf, timeout,
 416                                                   &len);
 417         if (!NT_STATUS_IS_OK(status)) {
 418                 return status;
 419         }
 420
 421         if (CVAL(lenbuf,0) == 0 && min_recv_size &&
 422             (smb_len_large(lenbuf) > /* Could be a UNIX large writeX. */
 423                 (min_recv_size + STANDARD_WRITE_AND_X_HEADER_SIZE)) &&
 424             !srv_is_signing_active(sconn) &&
 425             sconn->smb1.echo_handler.trusted_fde == NULL) {
 426
 427                 return receive_smb_raw_talloc_partial_read(
 428                         mem_ctx, lenbuf, sconn, sock, buffer, timeout,
 429                         p_unread, plen);
 430         }
 431
 432         if (!valid_packet_size(len)) {
 433                 return NT_STATUS_INVALID_PARAMETER;
 434         }
 435
 436         /*
 437          * The +4 here can't wrap, we've checked the length above already.
 438          */
 439
 440         *buffer = talloc_array(mem_ctx, char, len+4);
 441
 442         if (*buffer == NULL) {
 443                 DEBUG(0, ("Could not allocate inbuf of length %d\n",
 444                           (int)len+4));
 445                 return NT_STATUS_NO_MEMORY;
 446         }
 447
 448         memcpy(*buffer, lenbuf, sizeof(lenbuf));
 449
 450         status = read_packet_remainder(sock, (*buffer)+4, timeout, len);
 451         if (!NT_STATUS_IS_OK(status)) {
 452                 return status;
 453         }
 454
 455         *plen = len + 4;
 456         return NT_STATUS_OK;
 457 }
 458
 459 static NTSTATUS receive_smb_talloc(TALLOC_CTX *mem_ctx,
 460                                    struct smbd_server_connection *sconn,
 461                                    int sock,
 462                                    char **buffer, unsigned int timeout,
 463                                    size_t *p_unread, bool *p_encrypted,
 464                                    size_t *p_len,
 465                                    uint32_t *seqnum,
 466                                    bool trusted_channel)
 467 {
 468         size_t len = 0;
 469         NTSTATUS status;
 470
 471         *p_encrypted = false;
 472
 473         status = receive_smb_raw_talloc(mem_ctx, sconn, sock, buffer, timeout,
 474                                         p_unread, &len);
 475         if (!NT_STATUS_IS_OK(status)) {
 476                 DEBUG(NT_STATUS_EQUAL(status, NT_STATUS_END_OF_FILE)?5:1,
 477                       ("receive_smb_raw_talloc failed for client %s "
 478                        "read error = %s.\n",
 479                        tsocket_address_string(sconn->remote_address,
 480                                               talloc_tos()),
 481                        nt_errstr(status)) );
 482                 return status;
 483         }
 484
 485         if (is_encrypted_packet(sconn, (uint8_t *)*buffer)) {
 486                 status = srv_decrypt_buffer(sconn, *buffer);
 487                 if (!NT_STATUS_IS_OK(status)) {
 488                         DEBUG(0, ("receive_smb_talloc: SMB decryption failed on "
 489                                 "incoming packet! Error %s\n",
 490                                 nt_errstr(status) ));
 491                         return status;
 492                 }
 493                 *p_encrypted = true;
 494         }
 495
 496         /* Check the incoming SMB signature. */
 497         if (!srv_check_sign_mac(sconn, *buffer, seqnum, trusted_channel)) {
 498                 DEBUG(0, ("receive_smb: SMB Signature verification failed on "
 499                           "incoming packet!\n"));
 500                 return NT_STATUS_INVALID_NETWORK_RESPONSE;
 501         }
 502
 503         *p_len = len;
 504         return NT_STATUS_OK;
 505 }
 506
 507 /*
 508  * Initialize a struct smb_request from an inbuf
 509  */
 510
 511 static bool init_smb_request(struct smb_request *req,
 512                              struct smbd_server_connection *sconn,
 513                              const uint8 *inbuf,
 514                              size_t unread_bytes, bool encrypted,
 515                              uint32_t seqnum)
 516 {
 517         size_t req_size = smb_len(inbuf) + 4;
 518         /* Ensure we have at least smb_size bytes. */
 519         if (req_size < smb_size) {
 520                 DEBUG(0,("init_smb_request: invalid request size %u\n",
 521                         (unsigned int)req_size ));
 522                 return false;
 523         }
 524         req->cmd    = CVAL(inbuf, smb_com);
 525         req->flags2 = SVAL(inbuf, smb_flg2);
 526         req->smbpid = SVAL(inbuf, smb_pid);
 527         req->mid    = (uint64_t)SVAL(inbuf, smb_mid);
 528         req->seqnum = seqnum;
 529         req->vuid   = SVAL(inbuf, smb_uid);
 530         req->tid    = SVAL(inbuf, smb_tid);
 531         req->wct    = CVAL(inbuf, smb_wct);
 532         req->vwv    = (const uint16_t *)(inbuf+smb_vwv);
 533         req->buflen = smb_buflen(inbuf);
 534         req->buf    = (const uint8_t *)smb_buf_const(inbuf);
 535         req->unread_bytes = unread_bytes;
 536         req->encrypted = encrypted;
 537         req->sconn = sconn;
 538         req->conn = conn_find(sconn,req->tid);
 539         req->chain_fsp = NULL;
 540         req->chain_outbuf = NULL;
 541         req->done = false;
 542         req->smb2req = NULL;
 543         smb_init_perfcount_data(&req->pcd);
 544
 545         /* Ensure we have at least wct words and 2 bytes of bcc. */
 546         if (smb_size + req->wct*2 > req_size) {
 547                 DEBUG(0,("init_smb_request: invalid wct number %u (size %u)\n",
 548                         (unsigned int)req->wct,
 549                         (unsigned int)req_size));
 550                 return false;
 551         }
 552         /* Ensure bcc is correct. */
 553         if (((const uint8_t *)smb_buf_const(inbuf)) + req->buflen > inbuf + req_size) {
 554                 DEBUG(0,("init_smb_request: invalid bcc number %u "
 555                         "(wct = %u, size %u)\n",
 556                         (unsigned int)req->buflen,
 557                         (unsigned int)req->wct,
 558                         (unsigned int)req_size));
 559                 return false;
 560         }
 561
 562         req->outbuf = NULL;
 563         return true;
 564 }
 565
 566 static void process_smb(struct smbd_server_connection *conn,
 567                         uint8_t *inbuf, size_t nread, size_t unread_bytes,
 568                         uint32_t seqnum, bool encrypted,
 569                         struct smb_perfcount_data *deferred_pcd);
 570
 571 static void smbd_deferred_open_timer(struct event_context *ev,
 572                                      struct timed_event *te,
 573                                      struct timeval _tval,
 574                                      void *private_data)
 575 {
 576         struct pending_message_list *msg = talloc_get_type(private_data,
 577                                            struct pending_message_list);
 578         struct smbd_server_connection *sconn = msg->sconn;
 579         TALLOC_CTX *mem_ctx = talloc_tos();
 580         uint64_t mid = (uint64_t)SVAL(msg->buf.data,smb_mid);
 581         uint8_t *inbuf;
 582
 583         inbuf = (uint8_t *)talloc_memdup(mem_ctx, msg->buf.data,
 584                                          msg->buf.length);
 585         if (inbuf == NULL) {
 586                 exit_server("smbd_deferred_open_timer: talloc failed\n");
 587                 return;
 588         }
 589
 590         /* We leave this message on the queue so the open code can
 591            know this is a retry. */
 592         DEBUG(5,("smbd_deferred_open_timer: trigger mid %llu.\n",
 593                 (unsigned long long)mid ));
 594
 595         /* Mark the message as processed so this is not
 596          * re-processed in error. */
 597         msg->processed = true;
 598
 599         process_smb(sconn, inbuf,
 600                     msg->buf.length, 0,
 601                     msg->seqnum, msg->encrypted, &msg->pcd);
 602
 603         /* If it's still there and was processed, remove it. */
 604         msg = get_deferred_open_message_smb(sconn, mid);
 605         if (msg && msg->processed) {
 606                 remove_deferred_open_message_smb(sconn, mid);
 607         }
 608 }
 609
 610 /****************************************************************************
 611  Function to push a message onto the tail of a linked list of smb messages ready
 612  for processing.
 613 ****************************************************************************/
 614
 615 static bool push_queued_message(struct smb_request *req,
 616                                 struct timeval request_time,
 617                                 struct timeval end_time,
 618                                 char *private_data, size_t private_len)
 619 {
 620         int msg_len = smb_len(req->inbuf) + 4;
 621         struct pending_message_list *msg;
 622
 623         msg = talloc_zero(NULL, struct pending_message_list);
 624
 625         if(msg == NULL) {
 626                 DEBUG(0,("push_message: malloc fail (1)\n"));
 627                 return False;
 628         }
 629         msg->sconn = req->sconn;
 630
 631         msg->buf = data_blob_talloc(msg, req->inbuf, msg_len);
 632         if(msg->buf.data == NULL) {
 633                 DEBUG(0,("push_message: malloc fail (2)\n"));
 634                 TALLOC_FREE(msg);
 635                 return False;
 636         }
 637
 638         msg->request_time = request_time;
 639         msg->seqnum = req->seqnum;
 640         msg->encrypted = req->encrypted;
 641         msg->processed = false;
 642         SMB_PERFCOUNT_DEFER_OP(&req->pcd, &msg->pcd);
 643
 644         if (private_data) {
 645                 msg->private_data = data_blob_talloc(msg, private_data,
 646                                                      private_len);
 647                 if (msg->private_data.data == NULL) {
 648                         DEBUG(0,("push_message: malloc fail (3)\n"));
 649                         TALLOC_FREE(msg);
 650                         return False;
 651                 }
 652         }
 653
 654         msg->te = tevent_add_timer(msg->sconn->ev_ctx,
 655                                    msg,
 656                                    end_time,
 657                                    smbd_deferred_open_timer,
 658                                    msg);
 659         if (!msg->te) {
 660                 DEBUG(0,("push_message: event_add_timed failed\n"));
 661                 TALLOC_FREE(msg);
 662                 return false;
 663         }
 664
 665         DLIST_ADD_END(req->sconn->deferred_open_queue, msg,
 666                       struct pending_message_list *);
 667
 668         DEBUG(10,("push_message: pushed message length %u on "
 669                   "deferred_open_queue\n", (unsigned int)msg_len));
 670
 671         return True;
 672 }
 673
 674 /****************************************************************************
 675  Function to delete a sharing violation open message by mid.
 676 ****************************************************************************/
 677
 678 void remove_deferred_open_message_smb(struct smbd_server_connection *sconn,
 679                                       uint64_t mid)
 680 {
 681         struct pending_message_list *pml;
 682
 683         if (sconn->using_smb2) {
 684                 remove_deferred_open_message_smb2(sconn, mid);
 685                 return;
 686         }
 687
 688         for (pml = sconn->deferred_open_queue; pml; pml = pml->next) {
 689                 if (mid == (uint64_t)SVAL(pml->buf.data,smb_mid)) {
 690                         DEBUG(10,("remove_deferred_open_message_smb: "
 691                                   "deleting mid %llu len %u\n",
 692                                   (unsigned long long)mid,
 693                                   (unsigned int)pml->buf.length ));
 694                         DLIST_REMOVE(sconn->deferred_open_queue, pml);
 695                         TALLOC_FREE(pml);
 696                         return;
 697                 }
 698         }
 699 }
 700
 701 /****************************************************************************
 702  Move a sharing violation open retry message to the front of the list and
 703  schedule it for immediate processing.
 704 ****************************************************************************/
 705
 706 void schedule_deferred_open_message_smb(struct smbd_server_connection *sconn,
 707                                         uint64_t mid)
 708 {
 709         struct pending_message_list *pml;
 710         int i = 0;
 711
 712         if (sconn->using_smb2) {
 713                 schedule_deferred_open_message_smb2(sconn, mid);
 714                 return;
 715         }
 716
 717         for (pml = sconn->deferred_open_queue; pml; pml = pml->next) {
 718                 uint64_t msg_mid = (uint64_t)SVAL(pml->buf.data,smb_mid);
 719
 720                 DEBUG(10,("schedule_deferred_open_message_smb: [%d] "
 721                         "msg_mid = %llu\n",
 722                         i++,
 723                         (unsigned long long)msg_mid ));
 724
 725                 if (mid == msg_mid) {
 726                         struct timed_event *te;
 727
 728                         if (pml->processed) {
 729                                 /* A processed message should not be
 730                                  * rescheduled. */
 731                                 DEBUG(0,("schedule_deferred_open_message_smb: LOGIC ERROR "
 732                                         "message mid %llu was already processed\n",
 733                                         (unsigned long long)msg_mid ));
 734                                 continue;
 735                         }
 736
 737                         DEBUG(10,("schedule_deferred_open_message_smb: "
 738                                 "scheduling mid %llu\n",
 739                                 (unsigned long long)mid ));
 740
 741                         te = tevent_add_timer(pml->sconn->ev_ctx,
 742                                               pml,
 743                                               timeval_zero(),
 744                                               smbd_deferred_open_timer,
 745                                               pml);
 746                         if (!te) {
 747                                 DEBUG(10,("schedule_deferred_open_message_smb: "
 748                                         "event_add_timed() failed, "
 749                                         "skipping mid %llu\n",
 750                                         (unsigned long long)msg_mid ));
 751                         }
 752
 753                         TALLOC_FREE(pml->te);
 754                         pml->te = te;
 755                         DLIST_PROMOTE(sconn->deferred_open_queue, pml);
 756                         return;
 757                 }
 758         }
 759
 760         DEBUG(10,("schedule_deferred_open_message_smb: failed to "
 761                 "find message mid %llu\n",
 762                 (unsigned long long)mid ));
 763 }
 764
 765 /****************************************************************************
 766  Return true if this mid is on the deferred queue and was not yet processed.
 767 ****************************************************************************/
 768
 769 bool open_was_deferred(struct smbd_server_connection *sconn, uint64_t mid)
 770 {
 771         struct pending_message_list *pml;
 772
 773         if (sconn->using_smb2) {
 774                 return open_was_deferred_smb2(sconn, mid);
 775         }
 776
 777         for (pml = sconn->deferred_open_queue; pml; pml = pml->next) {
 778                 if (((uint64_t)SVAL(pml->buf.data,smb_mid)) == mid && !pml->processed) {
 779                         return True;
 780                 }
 781         }
 782         return False;
 783 }
 784
 785 /****************************************************************************
 786  Return the message queued by this mid.
 787 ****************************************************************************/
 788
 789 static struct pending_message_list *get_deferred_open_message_smb(
 790         struct smbd_server_connection *sconn, uint64_t mid)
 791 {
 792         struct pending_message_list *pml;
 793
 794         for (pml = sconn->deferred_open_queue; pml; pml = pml->next) {
 795                 if (((uint64_t)SVAL(pml->buf.data,smb_mid)) == mid) {
 796                         return pml;
 797                 }
 798         }
 799         return NULL;
 800 }
 801
 802 /****************************************************************************
 803  Get the state data queued by this mid.
 804 ****************************************************************************/
 805
 806 bool get_deferred_open_message_state(struct smb_request *smbreq,
 807                                 struct timeval *p_request_time,
 808                                 void **pp_state)
 809 {
 810         struct pending_message_list *pml;
 811
 812         if (smbreq->sconn->using_smb2) {
 813                 return get_deferred_open_message_state_smb2(smbreq->smb2req,
 814                                         p_request_time,
 815                                         pp_state);
 816         }
 817
 818         pml = get_deferred_open_message_smb(smbreq->sconn, smbreq->mid);
 819         if (!pml) {
 820                 return false;
 821         }
 822         if (p_request_time) {
 823                 *p_request_time = pml->request_time;
 824         }
 825         if (pp_state) {
 826                 *pp_state = (void *)pml->private_data.data;
 827         }
 828         return true;
 829 }
 830
 831 /****************************************************************************
 832  Function to push a deferred open smb message onto a linked list of local smb
 833  messages ready for processing.
 834 ****************************************************************************/
 835
 836 bool push_deferred_open_message_smb(struct smb_request *req,
 837                                struct timeval request_time,
 838                                struct timeval timeout,
 839                                struct file_id id,
 840                                char *private_data, size_t priv_len)
 841 {
 842         struct timeval end_time;
 843
 844         if (req->smb2req) {
 845                 return push_deferred_open_message_smb2(req->smb2req,
 846                                                 request_time,
 847                                                 timeout,
 848                                                 id,
 849                                                 private_data,
 850                                                 priv_len);
 851         }
 852
 853         if (req->unread_bytes) {
 854                 DEBUG(0,("push_deferred_open_message_smb: logic error ! "
 855                         "unread_bytes = %u\n",
 856                         (unsigned int)req->unread_bytes ));
 857                 smb_panic("push_deferred_open_message_smb: "
 858                         "logic error unread_bytes != 0" );
 859         }
 860
 861         end_time = timeval_sum(&request_time, &timeout);
 862
 863         DEBUG(10,("push_deferred_open_message_smb: pushing message "
 864                 "len %u mid %llu timeout time [%u.%06u]\n",
 865                 (unsigned int) smb_len(req->inbuf)+4,
 866                 (unsigned long long)req->mid,
 867                 (unsigned int)end_time.tv_sec,
 868                 (unsigned int)end_time.tv_usec));
 869
 870         return push_queued_message(req, request_time, end_time,
 871                                    private_data, priv_len);
 872 }
 873
 874 static void smbd_sig_term_handler(struct tevent_context *ev,
 875                                   struct tevent_signal *se,
 876                                   int signum,
 877                                   int count,
 878                                   void *siginfo,
 879                                   void *private_data)
 880 {
 881         exit_server_cleanly("termination signal");
 882 }
 883
 884 void smbd_setup_sig_term_handler(struct smbd_server_connection *sconn)
 885 {
 886         struct tevent_signal *se;
 887
 888         se = tevent_add_signal(sconn->ev_ctx,
 889                                sconn,
 890                                SIGTERM, 0,
 891                                smbd_sig_term_handler,
 892                                sconn);
 893         if (!se) {
 894                 exit_server("failed to setup SIGTERM handler");
 895         }
 896 }
 897
 898 static void smbd_sig_hup_handler(struct tevent_context *ev,
 899                                   struct tevent_signal *se,
 900                                   int signum,
 901                                   int count,
 902                                   void *siginfo,
 903                                   void *private_data)
 904 {
 905         struct smbd_server_connection *sconn =
 906                 talloc_get_type_abort(private_data,
 907                 struct smbd_server_connection);
 908
 909         change_to_root_user();
 910         DEBUG(1,("Reloading services after SIGHUP\n"));
 911         reload_services(sconn, conn_snum_used, false);
 912 }
 913
 914 void smbd_setup_sig_hup_handler(struct smbd_server_connection *sconn)
 915 {
 916         struct tevent_signal *se;
 917
 918         se = tevent_add_signal(sconn->ev_ctx,
 919                                sconn,
 920                                SIGHUP, 0,
 921                                smbd_sig_hup_handler,
 922                                sconn);
 923         if (!se) {
 924                 exit_server("failed to setup SIGHUP handler");
 925         }
 926 }
 927
 928 static void smbd_conf_updated(struct messaging_context *msg,
 929                               void *private_data,
 930                               uint32_t msg_type,
 931                               struct server_id server_id,
 932                               DATA_BLOB *data)
 933 {
 934         struct smbd_server_connection *sconn =
 935                 talloc_get_type_abort(private_data,
 936                 struct smbd_server_connection);
 937
 938         DEBUG(10,("smbd_conf_updated: Got message saying smb.conf was "
 939                   "updated. Reloading.\n"));
 940         change_to_root_user();
 941         reload_services(sconn, conn_snum_used, false);
 942 }
 943
 944 /*
 945  * Only allow 5 outstanding trans requests. We're allocating memory, so
 946  * prevent a DoS.
 947  */
 948
 949 NTSTATUS allow_new_trans(struct trans_state *list, uint64_t mid)
 950 {
 951         int count = 0;
 952         for (; list != NULL; list = list->next) {
 953
 954                 if (list->mid == mid) {
 955                         return NT_STATUS_INVALID_PARAMETER;
 956                 }
 957
 958                 count += 1;
 959         }
 960         if (count > 5) {
 961                 return NT_STATUS_INSUFFICIENT_RESOURCES;
 962         }
 963
 964         return NT_STATUS_OK;
 965 }
 966
 967 /*
 968 These flags determine some of the permissions required to do an operation
 969
 970 Note that I don't set NEED_WRITE on some write operations because they
 971 are used by some brain-dead clients when printing, and I don't want to
 972 force write permissions on print services.
 973 */
 974 #define AS_USER (1<<0)
 975 #define NEED_WRITE (1<<1) /* Must be paired with AS_USER */
 976 #define TIME_INIT (1<<2)
 977 #define CAN_IPC (1<<3) /* Must be paired with AS_USER */
 978 #define AS_GUEST (1<<5) /* Must *NOT* be paired with AS_USER */
 979 #define DO_CHDIR (1<<6)
 980
 981 /*
 982    define a list of possible SMB messages and their corresponding
 983    functions. Any message that has a NULL function is unimplemented -
 984    please feel free to contribute implementations!
 985 */
 986 static const struct smb_message_struct {
 987         const char *name;
 988         void (*fn)(struct smb_request *req);
 989         int flags;
 990 } smb_messages[256] = {
 991
 992 /* 0x00 */ { "SMBmkdir",reply_mkdir,AS_USER | NEED_WRITE},
 993 /* 0x01 */ { "SMBrmdir",reply_rmdir,AS_USER | NEED_WRITE},
 994 /* 0x02 */ { "SMBopen",reply_open,AS_USER },
 995 /* 0x03 */ { "SMBcreate",reply_mknew,AS_USER},
 996 /* 0x04 */ { "SMBclose",reply_close,AS_USER | CAN_IPC },
 997 /* 0x05 */ { "SMBflush",reply_flush,AS_USER},
 998 /* 0x06 */ { "SMBunlink",reply_unlink,AS_USER | NEED_WRITE },
 999 /* 0x07 */ { "SMBmv",reply_mv,AS_USER | NEED_WRITE },
1000 /* 0x08 */ { "SMBgetatr",reply_getatr,AS_USER},
1001 /* 0x09 */ { "SMBsetatr",reply_setatr,AS_USER | NEED_WRITE},
1002 /* 0x0a */ { "SMBread",reply_read,AS_USER},
1003 /* 0x0b */ { "SMBwrite",reply_write,AS_USER | CAN_IPC },
1004 /* 0x0c */ { "SMBlock",reply_lock,AS_USER},
1005 /* 0x0d */ { "SMBunlock",reply_unlock,AS_USER},
1006 /* 0x0e */ { "SMBctemp",reply_ctemp,AS_USER },
1007 /* 0x0f */ { "SMBmknew",reply_mknew,AS_USER},
1008 /* 0x10 */ { "SMBcheckpath",reply_checkpath,AS_USER},
1009 /* 0x11 */ { "SMBexit",reply_exit,DO_CHDIR},
1010 /* 0x12 */ { "SMBlseek",reply_lseek,AS_USER},
1011 /* 0x13 */ { "SMBlockread",reply_lockread,AS_USER},
1012 /* 0x14 */ { "SMBwriteunlock",reply_writeunlock,AS_USER},
1013 /* 0x15 */ { NULL, NULL, 0 },
1014 /* 0x16 */ { NULL, NULL, 0 },
1015 /* 0x17 */ { NULL, NULL, 0 },
1016 /* 0x18 */ { NULL, NULL, 0 },
1017 /* 0x19 */ { NULL, NULL, 0 },
1018 /* 0x1a */ { "SMBreadbraw",reply_readbraw,AS_USER},
1019 /* 0x1b */ { "SMBreadBmpx",reply_readbmpx,AS_USER},
1020 /* 0x1c */ { "SMBreadBs",reply_readbs,AS_USER },
1021 /* 0x1d */ { "SMBwritebraw",reply_writebraw,AS_USER},
1022 /* 0x1e */ { "SMBwriteBmpx",reply_writebmpx,AS_USER},
1023 /* 0x1f */ { "SMBwriteBs",reply_writebs,AS_USER},
1024 /* 0x20 */ { "SMBwritec", NULL,0},
1025 /* 0x21 */ { NULL, NULL, 0 },
1026 /* 0x22 */ { "SMBsetattrE",reply_setattrE,AS_USER | NEED_WRITE },
1027 /* 0x23 */ { "SMBgetattrE",reply_getattrE,AS_USER },
1028 /* 0x24 */ { "SMBlockingX",reply_lockingX,AS_USER },
1029 /* 0x25 */ { "SMBtrans",reply_trans,AS_USER | CAN_IPC },
1030 /* 0x26 */ { "SMBtranss",reply_transs,AS_USER | CAN_IPC},
1031 /* 0x27 */ { "SMBioctl",reply_ioctl,0},
1032 /* 0x28 */ { "SMBioctls", NULL,AS_USER},
1033 /* 0x29 */ { "SMBcopy",reply_copy,AS_USER | NEED_WRITE },
1034 /* 0x2a */ { "SMBmove", NULL,AS_USER | NEED_WRITE },
1035 /* 0x2b */ { "SMBecho",reply_echo,0},
1036 /* 0x2c */ { "SMBwriteclose",reply_writeclose,AS_USER},
1037 /* 0x2d */ { "SMBopenX",reply_open_and_X,AS_USER | CAN_IPC },
1038 /* 0x2e */ { "SMBreadX",reply_read_and_X,AS_USER | CAN_IPC },
1039 /* 0x2f */ { "SMBwriteX",reply_write_and_X,AS_USER | CAN_IPC },
1040 /* 0x30 */ { NULL, NULL, 0 },
1041 /* 0x31 */ { NULL, NULL, 0 },
1042 /* 0x32 */ { "SMBtrans2",reply_trans2, AS_USER | CAN_IPC },
1043 /* 0x33 */ { "SMBtranss2",reply_transs2, AS_USER | CAN_IPC },
1044 /* 0x34 */ { "SMBfindclose",reply_findclose,AS_USER},
1045 /* 0x35 */ { "SMBfindnclose",reply_findnclose,AS_USER},
1046 /* 0x36 */ { NULL, NULL, 0 },
1047 /* 0x37 */ { NULL, NULL, 0 },
1048 /* 0x38 */ { NULL, NULL, 0 },
1049 /* 0x39 */ { NULL, NULL, 0 },
1050 /* 0x3a */ { NULL, NULL, 0 },
1051 /* 0x3b */ { NULL, NULL, 0 },
1052 /* 0x3c */ { NULL, NULL, 0 },
1053 /* 0x3d */ { NULL, NULL, 0 },
1054 /* 0x3e */ { NULL, NULL, 0 },
1055 /* 0x3f */ { NULL, NULL, 0 },
1056 /* 0x40 */ { NULL, NULL, 0 },
1057 /* 0x41 */ { NULL, NULL, 0 },
1058 /* 0x42 */ { NULL, NULL, 0 },
1059 /* 0x43 */ { NULL, NULL, 0 },
1060 /* 0x44 */ { NULL, NULL, 0 },
1061 /* 0x45 */ { NULL, NULL, 0 },
1062 /* 0x46 */ { NULL, NULL, 0 },
1063 /* 0x47 */ { NULL, NULL, 0 },
1064 /* 0x48 */ { NULL, NULL, 0 },
1065 /* 0x49 */ { NULL, NULL, 0 },
1066 /* 0x4a */ { NULL, NULL, 0 },
1067 /* 0x4b */ { NULL, NULL, 0 },
1068 /* 0x4c */ { NULL, NULL, 0 },
1069 /* 0x4d */ { NULL, NULL, 0 },
1070 /* 0x4e */ { NULL, NULL, 0 },
1071 /* 0x4f */ { NULL, NULL, 0 },
1072 /* 0x50 */ { NULL, NULL, 0 },
1073 /* 0x51 */ { NULL, NULL, 0 },
1074 /* 0x52 */ { NULL, NULL, 0 },
1075 /* 0x53 */ { NULL, NULL, 0 },
1076 /* 0x54 */ { NULL, NULL, 0 },
1077 /* 0x55 */ { NULL, NULL, 0 },
1078 /* 0x56 */ { NULL, NULL, 0 },
1079 /* 0x57 */ { NULL, NULL, 0 },
1080 /* 0x58 */ { NULL, NULL, 0 },
1081 /* 0x59 */ { NULL, NULL, 0 },
1082 /* 0x5a */ { NULL, NULL, 0 },
1083 /* 0x5b */ { NULL, NULL, 0 },
1084 /* 0x5c */ { NULL, NULL, 0 },
1085 /* 0x5d */ { NULL, NULL, 0 },
1086 /* 0x5e */ { NULL, NULL, 0 },
1087 /* 0x5f */ { NULL, NULL, 0 },
1088 /* 0x60 */ { NULL, NULL, 0 },
1089 /* 0x61 */ { NULL, NULL, 0 },
1090 /* 0x62 */ { NULL, NULL, 0 },
1091 /* 0x63 */ { NULL, NULL, 0 },
1092 /* 0x64 */ { NULL, NULL, 0 },
1093 /* 0x65 */ { NULL, NULL, 0 },
1094 /* 0x66 */ { NULL, NULL, 0 },
1095 /* 0x67 */ { NULL, NULL, 0 },
1096 /* 0x68 */ { NULL, NULL, 0 },
1097 /* 0x69 */ { NULL, NULL, 0 },
1098 /* 0x6a */ { NULL, NULL, 0 },
1099 /* 0x6b */ { NULL, NULL, 0 },
1100 /* 0x6c */ { NULL, NULL, 0 },
1101 /* 0x6d */ { NULL, NULL, 0 },
1102 /* 0x6e */ { NULL, NULL, 0 },
1103 /* 0x6f */ { NULL, NULL, 0 },
1104 /* 0x70 */ { "SMBtcon",reply_tcon,0},
1105 /* 0x71 */ { "SMBtdis",reply_tdis,DO_CHDIR},
1106 /* 0x72 */ { "SMBnegprot",reply_negprot,0},
1107 /* 0x73 */ { "SMBsesssetupX",reply_sesssetup_and_X,0},
1108 /* 0x74 */ { "SMBulogoffX",reply_ulogoffX, 0}, /* ulogoff doesn't give a valid TID */
1109 /* 0x75 */ { "SMBtconX",reply_tcon_and_X,0},
1110 /* 0x76 */ { NULL, NULL, 0 },
1111 /* 0x77 */ { NULL, NULL, 0 },
1112 /* 0x78 */ { NULL, NULL, 0 },
1113 /* 0x79 */ { NULL, NULL, 0 },
1114 /* 0x7a */ { NULL, NULL, 0 },
1115 /* 0x7b */ { NULL, NULL, 0 },
1116 /* 0x7c */ { NULL, NULL, 0 },
1117 /* 0x7d */ { NULL, NULL, 0 },
1118 /* 0x7e */ { NULL, NULL, 0 },
1119 /* 0x7f */ { NULL, NULL, 0 },
1120 /* 0x80 */ { "SMBdskattr",reply_dskattr,AS_USER},
1121 /* 0x81 */ { "SMBsearch",reply_search,AS_USER},
1122 /* 0x82 */ { "SMBffirst",reply_search,AS_USER},
1123 /* 0x83 */ { "SMBfunique",reply_search,AS_USER},
1124 /* 0x84 */ { "SMBfclose",reply_fclose,AS_USER},
1125 /* 0x85 */ { NULL, NULL, 0 },
1126 /* 0x86 */ { NULL, NULL, 0 },
1127 /* 0x87 */ { NULL, NULL, 0 },
1128 /* 0x88 */ { NULL, NULL, 0 },
1129 /* 0x89 */ { NULL, NULL, 0 },
1130 /* 0x8a */ { NULL, NULL, 0 },
1131 /* 0x8b */ { NULL, NULL, 0 },
1132 /* 0x8c */ { NULL, NULL, 0 },
1133 /* 0x8d */ { NULL, NULL, 0 },
1134 /* 0x8e */ { NULL, NULL, 0 },
1135 /* 0x8f */ { NULL, NULL, 0 },
1136 /* 0x90 */ { NULL, NULL, 0 },
1137 /* 0x91 */ { NULL, NULL, 0 },
1138 /* 0x92 */ { NULL, NULL, 0 },
1139 /* 0x93 */ { NULL, NULL, 0 },
1140 /* 0x94 */ { NULL, NULL, 0 },
1141 /* 0x95 */ { NULL, NULL, 0 },
1142 /* 0x96 */ { NULL, NULL, 0 },
1143 /* 0x97 */ { NULL, NULL, 0 },
1144 /* 0x98 */ { NULL, NULL, 0 },
1145 /* 0x99 */ { NULL, NULL, 0 },
1146 /* 0x9a */ { NULL, NULL, 0 },
1147 /* 0x9b */ { NULL, NULL, 0 },
1148 /* 0x9c */ { NULL, NULL, 0 },
1149 /* 0x9d */ { NULL, NULL, 0 },
1150 /* 0x9e */ { NULL, NULL, 0 },
1151 /* 0x9f */ { NULL, NULL, 0 },
1152 /* 0xa0 */ { "SMBnttrans",reply_nttrans, AS_USER | CAN_IPC },
1153 /* 0xa1 */ { "SMBnttranss",reply_nttranss, AS_USER | CAN_IPC },
1154 /* 0xa2 */ { "SMBntcreateX",reply_ntcreate_and_X, AS_USER | CAN_IPC },
1155 /* 0xa3 */ { NULL, NULL, 0 },
1156 /* 0xa4 */ { "SMBntcancel",reply_ntcancel, 0 },
1157 /* 0xa5 */ { "SMBntrename",reply_ntrename, AS_USER | NEED_WRITE },
1158 /* 0xa6 */ { NULL, NULL, 0 },
1159 /* 0xa7 */ { NULL, NULL, 0 },
1160 /* 0xa8 */ { NULL, NULL, 0 },
1161 /* 0xa9 */ { NULL, NULL, 0 },
1162 /* 0xaa */ { NULL, NULL, 0 },
1163 /* 0xab */ { NULL, NULL, 0 },
1164 /* 0xac */ { NULL, NULL, 0 },
1165 /* 0xad */ { NULL, NULL, 0 },
1166 /* 0xae */ { NULL, NULL, 0 },
1167 /* 0xaf */ { NULL, NULL, 0 },
1168 /* 0xb0 */ { NULL, NULL, 0 },
1169 /* 0xb1 */ { NULL, NULL, 0 },
1170 /* 0xb2 */ { NULL, NULL, 0 },
1171 /* 0xb3 */ { NULL, NULL, 0 },
1172 /* 0xb4 */ { NULL, NULL, 0 },
1173 /* 0xb5 */ { NULL, NULL, 0 },
1174 /* 0xb6 */ { NULL, NULL, 0 },
1175 /* 0xb7 */ { NULL, NULL, 0 },
1176 /* 0xb8 */ { NULL, NULL, 0 },
1177 /* 0xb9 */ { NULL, NULL, 0 },
1178 /* 0xba */ { NULL, NULL, 0 },
1179 /* 0xbb */ { NULL, NULL, 0 },
1180 /* 0xbc */ { NULL, NULL, 0 },
1181 /* 0xbd */ { NULL, NULL, 0 },
1182 /* 0xbe */ { NULL, NULL, 0 },
1183 /* 0xbf */ { NULL, NULL, 0 },
1184 /* 0xc0 */ { "SMBsplopen",reply_printopen,AS_USER},
1185 /* 0xc1 */ { "SMBsplwr",reply_printwrite,AS_USER},
1186 /* 0xc2 */ { "SMBsplclose",reply_printclose,AS_USER},
1187 /* 0xc3 */ { "SMBsplretq",reply_printqueue,AS_USER},
1188 /* 0xc4 */ { NULL, NULL, 0 },
1189 /* 0xc5 */ { NULL, NULL, 0 },
1190 /* 0xc6 */ { NULL, NULL, 0 },
1191 /* 0xc7 */ { NULL, NULL, 0 },
1192 /* 0xc8 */ { NULL, NULL, 0 },
1193 /* 0xc9 */ { NULL, NULL, 0 },
1194 /* 0xca */ { NULL, NULL, 0 },
1195 /* 0xcb */ { NULL, NULL, 0 },
1196 /* 0xcc */ { NULL, NULL, 0 },
1197 /* 0xcd */ { NULL, NULL, 0 },
1198 /* 0xce */ { NULL, NULL, 0 },
1199 /* 0xcf */ { NULL, NULL, 0 },
1200 /* 0xd0 */ { "SMBsends",reply_sends,AS_GUEST},
1201 /* 0xd1 */ { "SMBsendb", NULL,AS_GUEST},
1202 /* 0xd2 */ { "SMBfwdname", NULL,AS_GUEST},
1203 /* 0xd3 */ { "SMBcancelf", NULL,AS_GUEST},
1204 /* 0xd4 */ { "SMBgetmac", NULL,AS_GUEST},
1205 /* 0xd5 */ { "SMBsendstrt",reply_sendstrt,AS_GUEST},
1206 /* 0xd6 */ { "SMBsendend",reply_sendend,AS_GUEST},
1207 /* 0xd7 */ { "SMBsendtxt",reply_sendtxt,AS_GUEST},
1208 /* 0xd8 */ { NULL, NULL, 0 },
1209 /* 0xd9 */ { NULL, NULL, 0 },
1210 /* 0xda */ { NULL, NULL, 0 },
1211 /* 0xdb */ { NULL, NULL, 0 },
1212 /* 0xdc */ { NULL, NULL, 0 },
1213 /* 0xdd */ { NULL, NULL, 0 },
1214 /* 0xde */ { NULL, NULL, 0 },
1215 /* 0xdf */ { NULL, NULL, 0 },
1216 /* 0xe0 */ { NULL, NULL, 0 },
1217 /* 0xe1 */ { NULL, NULL, 0 },
1218 /* 0xe2 */ { NULL, NULL, 0 },
1219 /* 0xe3 */ { NULL, NULL, 0 },
1220 /* 0xe4 */ { NULL, NULL, 0 },
1221 /* 0xe5 */ { NULL, NULL, 0 },
1222 /* 0xe6 */ { NULL, NULL, 0 },
1223 /* 0xe7 */ { NULL, NULL, 0 },
1224 /* 0xe8 */ { NULL, NULL, 0 },
1225 /* 0xe9 */ { NULL, NULL, 0 },
1226 /* 0xea */ { NULL, NULL, 0 },
1227 /* 0xeb */ { NULL, NULL, 0 },
1228 /* 0xec */ { NULL, NULL, 0 },
1229 /* 0xed */ { NULL, NULL, 0 },
1230 /* 0xee */ { NULL, NULL, 0 },
1231 /* 0xef */ { NULL, NULL, 0 },
1232 /* 0xf0 */ { NULL, NULL, 0 },
1233 /* 0xf1 */ { NULL, NULL, 0 },
1234 /* 0xf2 */ { NULL, NULL, 0 },
1235 /* 0xf3 */ { NULL, NULL, 0 },
1236 /* 0xf4 */ { NULL, NULL, 0 },
1237 /* 0xf5 */ { NULL, NULL, 0 },
1238 /* 0xf6 */ { NULL, NULL, 0 },
1239 /* 0xf7 */ { NULL, NULL, 0 },
1240 /* 0xf8 */ { NULL, NULL, 0 },
1241 /* 0xf9 */ { NULL, NULL, 0 },
1242 /* 0xfa */ { NULL, NULL, 0 },
1243 /* 0xfb */ { NULL, NULL, 0 },
1244 /* 0xfc */ { NULL, NULL, 0 },
1245 /* 0xfd */ { NULL, NULL, 0 },
1246 /* 0xfe */ { NULL, NULL, 0 },
1247 /* 0xff */ { NULL, NULL, 0 }
1248
1249 };
1250
1251 /*******************************************************************
1252  allocate and initialize a reply packet
1253 ********************************************************************/
1254
1255 static bool create_outbuf(TALLOC_CTX *mem_ctx, struct smb_request *req,
1256                           const char *inbuf, char **outbuf, uint8_t num_words,
1257                           uint32_t num_bytes)
1258 {
1259         /*
1260          * Protect against integer wrap
1261          */
1262         if ((num_bytes > 0xffffff)
1263             || ((num_bytes + smb_size + num_words*2) > 0xffffff)) {
1264                 char *msg;
1265                 if (asprintf(&msg, "num_bytes too large: %u",
1266                              (unsigned)num_bytes) == -1) {
1267                         msg = discard_const_p(char, "num_bytes too large");
1268                 }
1269                 smb_panic(msg);
1270         }
1271
1272         *outbuf = talloc_array(mem_ctx, char,
1273                                smb_size + num_words*2 + num_bytes);
1274         if (*outbuf == NULL) {
1275                 return false;
1276         }
1277
1278         construct_reply_common(req, inbuf, *outbuf);
1279         srv_set_message(*outbuf, num_words, num_bytes, false);
1280         /*
1281          * Zero out the word area, the caller has to take care of the bcc area
1282          * himself
1283          */
1284         if (num_words != 0) {
1285                 memset(*outbuf + smb_vwv0, 0, num_words*2);
1286         }
1287
1288         return true;
1289 }
1290
1291 void reply_outbuf(struct smb_request *req, uint8 num_words, uint32 num_bytes)
1292 {
1293         char *outbuf;
1294         if (!create_outbuf(req, req, (const char *)req->inbuf, &outbuf, num_words,
1295                            num_bytes)) {
1296                 smb_panic("could not allocate output buffer\n");
1297         }
1298         req->outbuf = (uint8_t *)outbuf;
1299 }
1300
1301
1302 /*******************************************************************
1303  Dump a packet to a file.
1304 ********************************************************************/
1305
1306 static void smb_dump(const char *name, int type, const char *data, ssize_t len)
1307 {
1308         int fd, i;
1309         char *fname = NULL;
1310         if (DEBUGLEVEL < 50) {
1311                 return;
1312         }
1313
1314         if (len < 4) len = smb_len(data)+4;
1315         for (i=1;i<100;i++) {
1316                 if (asprintf(&fname, "/tmp/%s.%d.%s", name, i,
1317                              type ? "req" : "resp") == -1) {
1318                         return;
1319                 }
1320                 fd = open(fname, O_WRONLY|O_CREAT|O_EXCL, 0644);
1321                 if (fd != -1 || errno != EEXIST) break;
1322         }
1323         if (fd != -1) {
1324                 ssize_t ret = write(fd, data, len);
1325                 if (ret != len)
1326                         DEBUG(0,("smb_dump: problem: write returned %d\n", (int)ret ));
1327                 close(fd);
1328                 DEBUG(0,("created %s len %lu\n", fname, (unsigned long)len));
1329         }
1330         SAFE_FREE(fname);
1331 }
1332
1333 /****************************************************************************
1334  Prepare everything for calling the actual request function, and potentially
1335  call the request function via the "new" interface.
1336
1337  Return False if the "legacy" function needs to be called, everything is
1338  prepared.
1339
1340  Return True if we're done.
1341
1342  I know this API sucks, but it is the one with the least code change I could
1343  find.
1344 ****************************************************************************/
1345
1346 static connection_struct *switch_message(uint8 type, struct smb_request *req, int size)
1347 {
1348         int flags;
1349         uint16 session_tag;
1350         connection_struct *conn = NULL;
1351         struct smbd_server_connection *sconn = req->sconn;
1352         char *raddr;
1353
1354         errno = 0;
1355
1356         if (smb_messages[type].fn == NULL) {
1357                 DEBUG(0,("Unknown message type %d!\n",type));
1358                 smb_dump("Unknown", 1, (const char *)req->inbuf, size);
1359                 reply_unknown_new(req, type);
1360                 return NULL;
1361         }
1362
1363         flags = smb_messages[type].flags;
1364
1365         /* In share mode security we must ignore the vuid. */
1366         session_tag = (lp_security() == SEC_SHARE)
1367                 ? UID_FIELD_INVALID : req->vuid;
1368         conn = req->conn;
1369
1370         DEBUG(3,("switch message %s (pid %d) conn 0x%lx\n", smb_fn_name(type),
1371                  (int)sys_getpid(), (unsigned long)conn));
1372
1373         smb_dump(smb_fn_name(type), 1, (const char *)req->inbuf, size);
1374
1375         /* Ensure this value is replaced in the incoming packet. */
1376         SSVAL(discard_const_p(uint8_t, req->inbuf),smb_uid,session_tag);
1377
1378         /*
1379          * Ensure the correct username is in current_user_info.  This is a
1380          * really ugly bugfix for problems with multiple session_setup_and_X's
1381          * being done and allowing %U and %G substitutions to work correctly.
1382          * There is a reason this code is done here, don't move it unless you
1383          * know what you're doing... :-).
1384          * JRA.
1385          */
1386
1387         if (session_tag != sconn->smb1.sessions.last_session_tag) {
1388                 user_struct *vuser = NULL;
1389
1390                 sconn->smb1.sessions.last_session_tag = session_tag;
1391                 if(session_tag != UID_FIELD_INVALID) {
1392                         vuser = get_valid_user_struct(sconn, session_tag);
1393                         if (vuser) {
1394                                 set_current_user_info(
1395                                         vuser->session_info->unix_info->sanitized_username,
1396                                         vuser->session_info->unix_info->unix_name,
1397                                         vuser->session_info->info->domain_name);
1398                         }
1399                 }
1400         }
1401
1402         /* Does this call need to be run as the connected user? */
1403         if (flags & AS_USER) {
1404
1405                 /* Does this call need a valid tree connection? */
1406                 if (!conn) {
1407                         /*
1408                          * Amazingly, the error code depends on the command
1409                          * (from Samba4).
1410                          */
1411                         if (type == SMBntcreateX) {
1412                                 reply_nterror(req, NT_STATUS_INVALID_HANDLE);
1413                         } else {
1414                                 reply_nterror(req, NT_STATUS_NETWORK_NAME_DELETED);
1415                         }
1416                         return NULL;
1417                 }
1418
1419                 if (!change_to_user(conn,session_tag)) {
1420                         DEBUG(0, ("Error: Could not change to user. Removing "
1421                                 "deferred open, mid=%llu.\n",
1422                                 (unsigned long long)req->mid));
1423                         reply_force_doserror(req, ERRSRV, ERRbaduid);
1424                         return conn;
1425                 }
1426
1427                 /* All NEED_WRITE and CAN_IPC flags must also have AS_USER. */
1428
1429                 /* Does it need write permission? */
1430                 if ((flags & NEED_WRITE) && !CAN_WRITE(conn)) {
1431                         reply_nterror(req, NT_STATUS_MEDIA_WRITE_PROTECTED);
1432                         return conn;
1433                 }
1434
1435                 /* IPC services are limited */
1436                 if (IS_IPC(conn) && !(flags & CAN_IPC)) {
1437                         reply_nterror(req, NT_STATUS_ACCESS_DENIED);
1438                         return conn;
1439                 }
1440         } else {
1441                 /* This call needs to be run as root */
1442                 change_to_root_user();
1443         }
1444
1445         /* load service specific parameters */
1446         if (conn) {
1447                 if (req->encrypted) {
1448                         conn->encrypted_tid = true;
1449                         /* encrypted required from now on. */
1450                         conn->encrypt_level = Required;
1451                 } else if (ENCRYPTION_REQUIRED(conn)) {
1452                         if (req->cmd != SMBtrans2 && req->cmd != SMBtranss2) {
1453                                 exit_server_cleanly("encryption required "
1454                                         "on connection");
1455                                 return conn;
1456                         }
1457                 }
1458
1459                 if (!set_current_service(conn,SVAL(req->inbuf,smb_flg),
1460                                          (flags & (AS_USER|DO_CHDIR)
1461                                           ?True:False))) {
1462                         reply_nterror(req, NT_STATUS_ACCESS_DENIED);
1463                         return conn;
1464                 }
1465                 conn->num_smb_operations++;
1466         }
1467
1468         raddr = tsocket_address_inet_addr_string(sconn->remote_address,
1469                                                  talloc_tos());
1470         if (raddr == NULL) {
1471                 reply_nterror(req, NT_STATUS_NO_MEMORY);
1472                 return conn;
1473         }
1474
1475         /* does this protocol need to be run as guest? */
1476         if ((flags & AS_GUEST)
1477             && (!change_to_guest() ||
1478                 !allow_access(lp_hostsdeny(-1), lp_hostsallow(-1),
1479                               sconn->remote_hostname,
1480                               raddr))) {
1481                 reply_nterror(req, NT_STATUS_ACCESS_DENIED);
1482                 return conn;
1483         }
1484
1485         smb_messages[type].fn(req);
1486         return req->conn;
1487 }
1488
1489 /****************************************************************************
1490  Construct a reply to the incoming packet.
1491 ****************************************************************************/
1492
1493 static void construct_reply(struct smbd_server_connection *sconn,
1494                             char *inbuf, int size, size_t unread_bytes,
1495                             uint32_t seqnum, bool encrypted,
1496                             struct smb_perfcount_data *deferred_pcd)
1497 {
1498         connection_struct *conn;
1499         struct smb_request *req;
1500
1501         if (!(req = talloc(talloc_tos(), struct smb_request))) {
1502                 smb_panic("could not allocate smb_request");
1503         }
1504
1505         if (!init_smb_request(req, sconn, (uint8 *)inbuf, unread_bytes,
1506                               encrypted, seqnum)) {
1507                 exit_server_cleanly("Invalid SMB request");
1508         }
1509
1510         req->inbuf  = (uint8_t *)talloc_move(req, &inbuf);
1511
1512         /* we popped this message off the queue - keep original perf data */
1513         if (deferred_pcd)
1514                 req->pcd = *deferred_pcd;
1515         else {
1516                 SMB_PERFCOUNT_START(&req->pcd);
1517                 SMB_PERFCOUNT_SET_OP(&req->pcd, req->cmd);
1518                 SMB_PERFCOUNT_SET_MSGLEN_IN(&req->pcd, size);
1519         }
1520
1521         conn = switch_message(req->cmd, req, size);
1522
1523         if (req->unread_bytes) {
1524                 /* writeX failed. drain socket. */
1525                 if (drain_socket(req->sconn->sock, req->unread_bytes) !=
1526                                 req->unread_bytes) {
1527                         smb_panic("failed to drain pending bytes");
1528                 }
1529                 req->unread_bytes = 0;
1530         }
1531
1532         if (req->done) {
1533                 TALLOC_FREE(req);
1534                 return;
1535         }
1536
1537         if (req->outbuf == NULL) {
1538                 return;
1539         }
1540
1541         if (CVAL(req->outbuf,0) == 0) {
1542                 show_msg((char *)req->outbuf);
1543         }
1544
1545         if (!srv_send_smb(req->sconn,
1546                         (char *)req->outbuf,
1547                         true, req->seqnum+1,
1548                         IS_CONN_ENCRYPTED(conn)||req->encrypted,
1549                         &req->pcd)) {
1550                 exit_server_cleanly("construct_reply: srv_send_smb failed.");
1551         }
1552
1553         TALLOC_FREE(req);
1554
1555         return;
1556 }
1557
1558 /****************************************************************************
1559  Process an smb from the client
1560 ****************************************************************************/
1561 static void process_smb(struct smbd_server_connection *sconn,
1562                         uint8_t *inbuf, size_t nread, size_t unread_bytes,
1563                         uint32_t seqnum, bool encrypted,
1564                         struct smb_perfcount_data *deferred_pcd)
1565 {
1566         int msg_type = CVAL(inbuf,0);
1567
1568         DO_PROFILE_INC(smb_count);
1569
1570         DEBUG( 6, ( "got message type 0x%x of len 0x%x\n", msg_type,
1571                     smb_len(inbuf) ) );
1572         DEBUG(3, ("Transaction %d of length %d (%u toread)\n",
1573                   sconn->trans_num, (int)nread, (unsigned int)unread_bytes));
1574
1575         if (msg_type != NBSSmessage) {
1576                 /*
1577                  * NetBIOS session request, keepalive, etc.
1578                  */
1579                 reply_special(sconn, (char *)inbuf, nread);
1580                 goto done;
1581         }
1582
1583         if (sconn->using_smb2) {
1584                 /* At this point we're not really using smb2,
1585                  * we make the decision here.. */
1586                 if (smbd_is_smb2_header(inbuf, nread)) {
1587                         smbd_smb2_first_negprot(sconn, inbuf, nread);
1588                         return;
1589                 } else if (nread >= smb_size && valid_smb_header(sconn, inbuf)
1590                                 && CVAL(inbuf, smb_com) != 0x72) {
1591                         /* This is a non-negprot SMB1 packet.
1592                            Disable SMB2 from now on. */
1593                         sconn->using_smb2 = false;
1594                 }
1595         }
1596
1597         /* Make sure this is an SMB packet. smb_size contains NetBIOS header
1598          * so subtract 4 from it. */
1599         if ((nread < (smb_size - 4)) || !valid_smb_header(sconn, inbuf)) {
1600                 DEBUG(2,("Non-SMB packet of length %d. Terminating server\n",
1601                          smb_len(inbuf)));
1602
1603                 /* special magic for immediate exit */
1604                 if ((nread == 9) &&
1605                     (IVAL(inbuf, 4) == 0x74697865) &&
1606                     lp_parm_bool(-1, "smbd", "suicide mode", false)) {
1607                         uint8_t exitcode = CVAL(inbuf, 8);
1608                         DEBUG(1, ("Exiting immediately with code %d\n",
1609                                   (int)exitcode));
1610                         exit(exitcode);
1611                 }
1612
1613                 exit_server_cleanly("Non-SMB packet");
1614         }
1615
1616         show_msg((char *)inbuf);
1617
1618         construct_reply(sconn, (char *)inbuf, nread, unread_bytes, seqnum,
1619                         encrypted, deferred_pcd);
1620         sconn->trans_num++;
1621
1622 done:
1623         sconn->num_requests++;
1624
1625         /* The timeout_processing function isn't run nearly
1626            often enough to implement 'max log size' without
1627            overrunning the size of the file by many megabytes.
1628            This is especially true if we are running at debug
1629            level 10.  Checking every 50 SMBs is a nice
1630            tradeoff of performance vs log file size overrun. */
1631
1632         if ((sconn->num_requests % 50) == 0 &&
1633             need_to_check_log_size()) {
1634                 change_to_root_user();
1635                 check_log_size();
1636         }
1637 }
1638
1639 /****************************************************************************
1640  Return a string containing the function name of a SMB command.
1641 ****************************************************************************/
1642
1643 const char *smb_fn_name(int type)
1644 {
1645         const char *unknown_name = "SMBunknown";
1646
1647         if (smb_messages[type].name == NULL)
1648                 return(unknown_name);
1649
1650         return(smb_messages[type].name);
1651 }
1652
1653 /****************************************************************************
1654  Helper functions for contruct_reply.
1655 ****************************************************************************/
1656
1657 void add_to_common_flags2(uint32 v)
1658 {
1659         common_flags2 |= v;
1660 }
1661
1662 void remove_from_common_flags2(uint32 v)
1663 {
1664         common_flags2 &= ~v;
1665 }
1666
1667 static void construct_reply_common(struct smb_request *req, const char *inbuf,
1668                                    char *outbuf)
1669 {
1670         uint16_t in_flags2 = SVAL(inbuf,smb_flg2);
1671         uint16_t out_flags2 = common_flags2;
1672
1673         out_flags2 |= in_flags2 & FLAGS2_UNICODE_STRINGS;
1674         out_flags2 |= in_flags2 & FLAGS2_SMB_SECURITY_SIGNATURES;
1675         out_flags2 |= in_flags2 & FLAGS2_SMB_SECURITY_SIGNATURES_REQUIRED;
1676
1677         srv_set_message(outbuf,0,0,false);
1678
1679         SCVAL(outbuf, smb_com, req->cmd);
1680         SIVAL(outbuf,smb_rcls,0);
1681         SCVAL(outbuf,smb_flg, FLAG_REPLY | (CVAL(inbuf,smb_flg) & FLAG_CASELESS_PATHNAMES));
1682         SSVAL(outbuf,smb_flg2, out_flags2);
1683         memset(outbuf+smb_pidhigh,'\0',(smb_tid-smb_pidhigh));
1684         memcpy(outbuf+smb_ss_field, inbuf+smb_ss_field, 8);
1685
1686         SSVAL(outbuf,smb_tid,SVAL(inbuf,smb_tid));
1687         SSVAL(outbuf,smb_pid,SVAL(inbuf,smb_pid));
1688         SSVAL(outbuf,smb_uid,SVAL(inbuf,smb_uid));
1689         SSVAL(outbuf,smb_mid,SVAL(inbuf,smb_mid));
1690 }
1691
1692 void construct_reply_common_req(struct smb_request *req, char *outbuf)
1693 {
1694         construct_reply_common(req, (const char *)req->inbuf, outbuf);
1695 }
1696
1697 /*
1698  * How many bytes have we already accumulated up to the current wct field
1699  * offset?
1700  */
1701
1702 size_t req_wct_ofs(struct smb_request *req)
1703 {
1704         size_t buf_size;
1705
1706         if (req->chain_outbuf == NULL) {
1707                 return smb_wct - 4;
1708         }
1709         buf_size = talloc_get_size(req->chain_outbuf);
1710         if ((buf_size % 4) != 0) {
1711                 buf_size += (4 - (buf_size % 4));
1712         }
1713         return buf_size - 4;
1714 }
1715
1716 /*
1717  * Hack around reply_nterror & friends not being aware of chained requests,
1718  * generating illegal (i.e. wct==0) chain replies.
1719  */
1720
1721 static void fixup_chain_error_packet(struct smb_request *req)
1722 {
1723         uint8_t *outbuf = req->outbuf;
1724         req->outbuf = NULL;
1725         reply_outbuf(req, 2, 0);
1726         memcpy(req->outbuf, outbuf, smb_wct);
1727         TALLOC_FREE(outbuf);
1728         SCVAL(req->outbuf, smb_vwv0, 0xff);
1729 }
1730
1731 /**
1732  * @brief Find the smb_cmd offset of the last command pushed
1733  * @param[in] buf       The buffer we're building up
1734  * @retval              Where can we put our next andx cmd?
1735  *
1736  * While chaining requests, the "next" request we're looking at needs to put
1737  * its SMB_Command before the data the previous request already built up added
1738  * to the chain. Find the offset to the place where we have to put our cmd.
1739  */
1740
1741 static bool find_andx_cmd_ofs(uint8_t *buf, size_t *pofs)
1742 {
1743         uint8_t cmd;
1744         size_t ofs;
1745
1746         cmd = CVAL(buf, smb_com);
1747
1748         if (!is_andx_req(cmd)) {
1749                 return false;
1750         }
1751
1752         ofs = smb_vwv0;
1753
1754         while (CVAL(buf, ofs) != 0xff) {
1755
1756                 if (!is_andx_req(CVAL(buf, ofs))) {
1757                         return false;
1758                 }
1759
1760                 /*
1761                  * ofs is from start of smb header, so add the 4 length
1762                  * bytes. The next cmd is right after the wct field.
1763                  */
1764                 ofs = SVAL(buf, ofs+2) + 4 + 1;
1765
1766                 if (ofs+4 >= talloc_get_size(buf)) {
1767                         return false;
1768                 }
1769         }
1770
1771         *pofs = ofs;
1772         return true;
1773 }
1774
1775 /**
1776  * @brief Do the smb chaining at a buffer level
1777  * @param[in] poutbuf           Pointer to the talloc'ed buffer to be modified
1778  * @param[in] andx_buf          Buffer to be appended
1779  */
1780
1781 static bool smb_splice_chain(uint8_t **poutbuf, const uint8_t *andx_buf)
1782 {
1783         uint8_t smb_command     = CVAL(andx_buf, smb_com);
1784         uint8_t wct             = CVAL(andx_buf, smb_wct);
1785         const uint16_t *vwv     = (const uint16_t *)(andx_buf + smb_vwv);
1786         uint32_t num_bytes      = smb_buflen(andx_buf);
1787         const uint8_t *bytes    = (const uint8_t *)smb_buf(andx_buf);
1788
1789         uint8_t *outbuf;
1790         size_t old_size, new_size;
1791         size_t ofs;
1792         size_t chain_padding = 0;
1793         size_t bytes_padding = 0;
1794         bool first_request;
1795
1796         old_size = talloc_get_size(*poutbuf);
1797
1798         /*
1799          * old_size == smb_wct means we're pushing the first request in for
1800          * libsmb/
1801          */
1802
1803         first_request = (old_size == smb_wct);
1804
1805         if (!first_request && ((old_size % 4) != 0)) {
1806                 /*
1807                  * Align the wct field of subsequent requests to a 4-byte
1808                  * boundary
1809                  */
1810                 chain_padding = 4 - (old_size % 4);
1811         }
1812
1813         /*
1814          * After the old request comes the new wct field (1 byte), the vwv's
1815          * and the num_bytes field.
1816          */
1817
1818         new_size = old_size + chain_padding + 1 + wct * sizeof(uint16_t) + 2;
1819
1820         new_size += bytes_padding + num_bytes;
1821
1822         if ((smb_command != SMBwriteX) && (new_size > 0xffff)) {
1823                 DEBUG(1, ("smb_splice_chain: %u bytes won't fit\n",
1824                           (unsigned)new_size));
1825                 return false;
1826         }
1827
1828         outbuf = talloc_realloc(NULL, *poutbuf, uint8_t, new_size);
1829         if (outbuf == NULL) {
1830                 DEBUG(0, ("talloc failed\n"));
1831                 return false;
1832         }
1833         *poutbuf = outbuf;
1834
1835         if (first_request) {
1836                 SCVAL(outbuf, smb_com, smb_command);
1837         } else {
1838                 size_t andx_cmd_ofs;
1839
1840                 if (!find_andx_cmd_ofs(outbuf, &andx_cmd_ofs)) {
1841                         DEBUG(1, ("invalid command chain\n"));
1842                         *poutbuf = talloc_realloc(
1843                                 NULL, *poutbuf, uint8_t, old_size);
1844                         return false;
1845                 }
1846
1847                 if (chain_padding != 0) {
1848                         memset(outbuf + old_size, 0, chain_padding);
1849                         old_size += chain_padding;
1850                 }
1851
1852                 SCVAL(outbuf, andx_cmd_ofs, smb_command);
1853                 SSVAL(outbuf, andx_cmd_ofs + 2, old_size - 4);
1854         }
1855
1856         ofs = old_size;
1857
1858         /*
1859          * Push the chained request:
1860          *
1861          * wct field
1862          */
1863
1864         SCVAL(outbuf, ofs, wct);
1865         ofs += 1;
1866
1867         /*
1868          * vwv array
1869          */
1870
1871         memcpy(outbuf + ofs, vwv, sizeof(uint16_t) * wct);
1872         ofs += sizeof(uint16_t) * wct;
1873
1874         /*
1875          * bcc (byte count)
1876          */
1877
1878         SSVAL(outbuf, ofs, num_bytes + bytes_padding);
1879         ofs += sizeof(uint16_t);
1880
1881         /*
1882          * padding
1883          */
1884
1885         if (bytes_padding != 0) {
1886                 memset(outbuf + ofs, 0, bytes_padding);
1887                 ofs += bytes_padding;
1888         }
1889
1890         /*
1891          * The bytes field
1892          */
1893
1894         memcpy(outbuf + ofs, bytes, num_bytes);
1895
1896         return true;
1897 }
1898
1899 /****************************************************************************
1900  Construct a chained reply and add it to the already made reply
1901 ****************************************************************************/
1902
1903 void chain_reply(struct smb_request *req)
1904 {
1905         size_t smblen = smb_len(req->inbuf);
1906         size_t already_used, length_needed;
1907         uint8_t chain_cmd;
1908         uint32_t chain_offset;  /* uint32_t to avoid overflow */
1909
1910         uint8_t wct;
1911         const uint16_t *vwv;
1912         uint16_t buflen;
1913         const uint8_t *buf;
1914
1915         if (IVAL(req->outbuf, smb_rcls) != 0) {
1916                 fixup_chain_error_packet(req);
1917         }
1918
1919         /*
1920          * Any of the AndX requests and replies have at least a wct of
1921          * 2. vwv[0] is the next command, vwv[1] is the offset from the
1922          * beginning of the SMB header to the next wct field.
1923          *
1924          * None of the AndX requests put anything valuable in vwv[0] and [1],
1925          * so we can overwrite it here to form the chain.
1926          */
1927
1928         if ((req->wct < 2) || (CVAL(req->outbuf, smb_wct) < 2)) {
1929                 if (req->chain_outbuf == NULL) {
1930                         req->chain_outbuf = talloc_realloc(
1931                                 req, req->outbuf, uint8_t,
1932                                 smb_len(req->outbuf) + 4);
1933                         if (req->chain_outbuf == NULL) {
1934                                 smb_panic("talloc failed");
1935                         }
1936                 }
1937                 req->outbuf = NULL;
1938                 goto error;
1939         }
1940
1941         /*
1942          * Here we assume that this is the end of the chain. For that we need
1943          * to set "next command" to 0xff and the offset to 0. If we later find
1944          * more commands in the chain, this will be overwritten again.
1945          */
1946
1947         SCVAL(req->outbuf, smb_vwv0, 0xff);
1948         SCVAL(req->outbuf, smb_vwv0+1, 0);
1949         SSVAL(req->outbuf, smb_vwv1, 0);
1950
1951         if (req->chain_outbuf == NULL) {
1952                 /*
1953                  * In req->chain_outbuf we collect all the replies. Start the
1954                  * chain by copying in the first reply.
1955                  *
1956                  * We do the realloc because later on we depend on
1957                  * talloc_get_size to determine the length of
1958                  * chain_outbuf. The reply_xxx routines might have
1959                  * over-allocated (reply_pipe_read_and_X used to be such an
1960                  * example).
1961                  */
1962                 req->chain_outbuf = talloc_realloc(
1963                         req, req->outbuf, uint8_t, smb_len(req->outbuf) + 4);
1964                 if (req->chain_outbuf == NULL) {
1965                         smb_panic("talloc failed");
1966                 }
1967                 req->outbuf = NULL;
1968         } else {
1969                 /*
1970                  * Update smb headers where subsequent chained commands
1971                  * may have updated them.
1972                  */
1973                 SSVAL(req->chain_outbuf, smb_tid, SVAL(req->outbuf, smb_tid));
1974                 SSVAL(req->chain_outbuf, smb_uid, SVAL(req->outbuf, smb_uid));
1975
1976                 if (!smb_splice_chain(&req->chain_outbuf, req->outbuf)) {
1977                         goto error;
1978                 }
1979                 TALLOC_FREE(req->outbuf);
1980         }
1981
1982         /*
1983          * We use the old request's vwv field to grab the next chained command
1984          * and offset into the chained fields.
1985          */
1986
1987         chain_cmd = CVAL(req->vwv+0, 0);
1988         chain_offset = SVAL(req->vwv+1, 0);
1989
1990         if (chain_cmd == 0xff) {
1991                 /*
1992                  * End of chain, no more requests from the client. So ship the
1993                  * replies.
1994                  */
1995                 smb_setlen((char *)(req->chain_outbuf),
1996                            talloc_get_size(req->chain_outbuf) - 4);
1997
1998                 if (!srv_send_smb(req->sconn, (char *)req->chain_outbuf,
1999                                   true, req->seqnum+1,
2000                                   IS_CONN_ENCRYPTED(req->conn)
2001                                   ||req->encrypted,
2002                                   &req->pcd)) {
2003                         exit_server_cleanly("chain_reply: srv_send_smb "
2004                                             "failed.");
2005                 }
2006                 TALLOC_FREE(req->chain_outbuf);
2007                 req->done = true;
2008                 return;
2009         }
2010
2011         /* add a new perfcounter for this element of chain */
2012         SMB_PERFCOUNT_ADD(&req->pcd);
2013         SMB_PERFCOUNT_SET_OP(&req->pcd, chain_cmd);
2014         SMB_PERFCOUNT_SET_MSGLEN_IN(&req->pcd, smblen);
2015
2016         /*
2017          * Check if the client tries to fool us. The chain offset
2018          * needs to point beyond the current request in the chain, it
2019          * needs to strictly grow. Otherwise we might be tricked into
2020          * an endless loop always processing the same request over and
2021          * over again. We used to assume that vwv and the byte buffer
2022          * array in a chain are always attached, but OS/2 the
2023          * Write&X/Read&X chain puts the Read&X vwv array right behind
2024          * the Write&X vwv chain. The Write&X bcc array is put behind
2025          * the Read&X vwv array. So now we check whether the chain
2026          * offset points strictly behind the previous vwv
2027          * array. req->buf points right after the vwv array of the
2028          * previous request. See
2029          * https://bugzilla.samba.org/show_bug.cgi?id=8360 for more
2030          * information.
2031          */
2032
2033         already_used = PTR_DIFF(req->buf, smb_base(req->inbuf));
2034         if (chain_offset <= already_used) {
2035                 goto error;
2036         }
2037
2038         /*
2039          * Next check: Make sure the chain offset does not point beyond the
2040          * overall smb request length.
2041          */
2042
2043         length_needed = chain_offset+1; /* wct */
2044         if (length_needed > smblen) {
2045                 goto error;
2046         }
2047
2048         /*
2049          * Now comes the pointer magic. Goal here is to set up req->vwv and
2050          * req->buf correctly again to be able to call the subsequent
2051          * switch_message(). The chain offset (the former vwv[1]) points at
2052          * the new wct field.
2053          */
2054
2055         wct = CVAL(smb_base(req->inbuf), chain_offset);
2056
2057         /*
2058          * Next consistency check: Make the new vwv array fits in the overall
2059          * smb request.
2060          */
2061
2062         length_needed += (wct+1)*sizeof(uint16_t); /* vwv+buflen */
2063         if (length_needed > smblen) {
2064                 goto error;
2065         }
2066         vwv = (const uint16_t *)(smb_base(req->inbuf) + chain_offset + 1);
2067
2068         /*
2069          * Now grab the new byte buffer....
2070          */
2071
2072         buflen = SVAL(vwv+wct, 0);
2073
2074         /*
2075          * .. and check that it fits.
2076          */
2077
2078         length_needed += buflen;
2079         if (length_needed > smblen) {
2080                 goto error;
2081         }
2082         buf = (const uint8_t *)(vwv+wct+1);
2083
2084         req->cmd = chain_cmd;
2085         req->wct = wct;
2086         req->vwv = discard_const_p(uint16_t, vwv);
2087         req->buflen = buflen;
2088         req->buf = buf;
2089
2090         switch_message(chain_cmd, req, smblen);
2091
2092         if (req->outbuf == NULL) {
2093                 /*
2094                  * This happens if the chained command has suspended itself or
2095                  * if it has called srv_send_smb() itself.
2096                  */
2097                 return;
2098         }
2099
2100         /*
2101          * We end up here if the chained command was not itself chained or
2102          * suspended, but for example a close() command. We now need to splice
2103          * the chained commands' outbuf into the already built up chain_outbuf
2104          * and ship the result.
2105          */
2106         goto done;
2107
2108  error:
2109         /*
2110          * We end up here if there's any error in the chain syntax. Report a
2111          * DOS error, just like Windows does.
2112          */
2113         reply_force_doserror(req, ERRSRV, ERRerror);
2114         fixup_chain_error_packet(req);
2115
2116  done:
2117         /*
2118          * This scary statement intends to set the
2119          * FLAGS2_32_BIT_ERROR_CODES flg2 field in req->chain_outbuf
2120          * to the value req->outbuf carries
2121          */
2122         SSVAL(req->chain_outbuf, smb_flg2,
2123               (SVAL(req->chain_outbuf, smb_flg2) & ~FLAGS2_32_BIT_ERROR_CODES)
2124               | (SVAL(req->outbuf, smb_flg2) & FLAGS2_32_BIT_ERROR_CODES));
2125
2126         /*
2127          * Transfer the error codes from the subrequest to the main one
2128          */
2129         SSVAL(req->chain_outbuf, smb_rcls, SVAL(req->outbuf, smb_rcls));
2130         SSVAL(req->chain_outbuf, smb_err, SVAL(req->outbuf, smb_err));
2131
2132         if (!smb_splice_chain(&req->chain_outbuf, req->outbuf)) {
2133                 exit_server_cleanly("chain_reply: smb_splice_chain failed\n");
2134         }
2135         TALLOC_FREE(req->outbuf);
2136
2137         smb_setlen((char *)(req->chain_outbuf),
2138                    talloc_get_size(req->chain_outbuf) - 4);
2139
2140         show_msg((char *)(req->chain_outbuf));
2141
2142         if (!srv_send_smb(req->sconn, (char *)req->chain_outbuf,
2143                           true, req->seqnum+1,
2144                           IS_CONN_ENCRYPTED(req->conn)||req->encrypted,
2145                           &req->pcd)) {
2146                 exit_server_cleanly("chain_reply: srv_send_smb failed.");
2147         }
2148         TALLOC_FREE(req->chain_outbuf);
2149         req->done = true;
2150 }
2151
2152 /****************************************************************************
2153  Check if services need reloading.
2154 ****************************************************************************/
2155
2156 static void check_reload(struct smbd_server_connection *sconn, time_t t)
2157 {
2158
2159         if (last_smb_conf_reload_time == 0) {
2160                 last_smb_conf_reload_time = t;
2161         }
2162
2163         if (t >= last_smb_conf_reload_time+SMBD_RELOAD_CHECK) {
2164                 reload_services(sconn, conn_snum_used, true);
2165                 last_smb_conf_reload_time = t;
2166         }
2167 }
2168
2169 static bool fd_is_readable(int fd)
2170 {
2171         int ret, revents;
2172
2173         ret = poll_one_fd(fd, POLLIN|POLLHUP, 0, &revents);
2174
2175         return ((ret > 0) && ((revents & (POLLIN|POLLHUP|POLLERR)) != 0));
2176
2177 }
2178
2179 static void smbd_server_connection_write_handler(
2180         struct smbd_server_connection *sconn)
2181 {
2182         /* TODO: make write nonblocking */
2183 }
2184
2185 static void smbd_server_connection_read_handler(
2186         struct smbd_server_connection *sconn, int fd)
2187 {
2188         uint8_t *inbuf = NULL;
2189         size_t inbuf_len = 0;
2190         size_t unread_bytes = 0;
2191         bool encrypted = false;
2192         TALLOC_CTX *mem_ctx = talloc_tos();
2193         NTSTATUS status;
2194         uint32_t seqnum;
2195
2196         bool from_client;
2197
2198         if (lp_async_smb_echo_handler()
2199             && fd_is_readable(sconn->smb1.echo_handler.trusted_fd)) {
2200                 /*
2201                  * This is the super-ugly hack to prefer the packets
2202                  * forwarded by the echo handler over the ones by the
2203                  * client directly
2204                  */
2205                 fd = sconn->smb1.echo_handler.trusted_fd;
2206         }
2207
2208         from_client = (sconn->sock == fd);
2209
2210         if (from_client) {
2211                 smbd_lock_socket(sconn);
2212
2213                 if (!fd_is_readable(fd)) {
2214                         DEBUG(10,("the echo listener was faster\n"));
2215                         smbd_unlock_socket(sconn);
2216                         return;
2217                 }
2218         }
2219
2220         /* TODO: make this completely nonblocking */
2221         status = receive_smb_talloc(mem_ctx, sconn, fd,
2222                                     (char **)(void *)&inbuf,
2223                                     0, /* timeout */
2224                                     &unread_bytes,
2225                                     &encrypted,
2226                                     &inbuf_len, &seqnum,
2227                                     false /* trusted channel */);
2228
2229         if (from_client) {
2230                 smbd_unlock_socket(sconn);
2231         }
2232
2233         if (NT_STATUS_EQUAL(status, NT_STATUS_RETRY)) {
2234                 goto process;
2235         }
2236         if (NT_STATUS_IS_ERR(status)) {
2237                 exit_server_cleanly("failed to receive smb request");
2238         }
2239         if (!NT_STATUS_IS_OK(status)) {
2240                 return;
2241         }
2242
2243 process:
2244         process_smb(sconn, inbuf, inbuf_len, unread_bytes,
2245                     seqnum, encrypted, NULL);
2246 }
2247
2248 static void smbd_server_connection_handler(struct event_context *ev,
2249                                            struct fd_event *fde,
2250                                            uint16_t flags,
2251                                            void *private_data)
2252 {
2253         struct smbd_server_connection *conn = talloc_get_type(private_data,
2254                                               struct smbd_server_connection);
2255
2256         if (flags & EVENT_FD_WRITE) {
2257                 smbd_server_connection_write_handler(conn);
2258                 return;
2259         }
2260         if (flags & EVENT_FD_READ) {
2261                 smbd_server_connection_read_handler(conn, conn->sock);
2262                 return;
2263         }
2264 }
2265
2266 static void smbd_server_echo_handler(struct event_context *ev,
2267                                      struct fd_event *fde,
2268                                      uint16_t flags,
2269                                      void *private_data)
2270 {
2271         struct smbd_server_connection *conn = talloc_get_type(private_data,
2272                                               struct smbd_server_connection);
2273
2274         if (flags & EVENT_FD_WRITE) {
2275                 smbd_server_connection_write_handler(conn);
2276                 return;
2277         }
2278         if (flags & EVENT_FD_READ) {
2279                 smbd_server_connection_read_handler(
2280                         conn, conn->smb1.echo_handler.trusted_fd);
2281                 return;
2282         }
2283 }
2284
2285 #ifdef CLUSTER_SUPPORT
2286 /****************************************************************************
2287 received when we should release a specific IP
2288 ****************************************************************************/
2289 static void release_ip(const char *ip, void *priv)
2290 {
2291         const char *addr = (const char *)priv;
2292         const char *p = addr;
2293
2294         if (strncmp("::ffff:", addr, 7) == 0) {
2295                 p = addr + 7;
2296         }
2297
2298         DEBUG(10, ("Got release IP message for %s, "
2299                    "our address is %s\n", ip, p));
2300
2301         if ((strcmp(p, ip) == 0) || ((p != addr) && strcmp(addr, ip) == 0)) {
2302                 /* we can't afford to do a clean exit - that involves
2303                    database writes, which would potentially mean we
2304                    are still running after the failover has finished -
2305                    we have to get rid of this process ID straight
2306                    away */
2307                 DEBUG(0,("Got release IP message for our IP %s - exiting immediately\n",
2308                         ip));
2309                 /* note we must exit with non-zero status so the unclean handler gets
2310                    called in the parent, so that the brl database is tickled */
2311                 _exit(1);
2312         }
2313 }
2314
2315 static int client_get_tcp_info(int sock, struct sockaddr_storage *server,
2316                                struct sockaddr_storage *client)
2317 {
2318         socklen_t length;
2319         length = sizeof(*server);
2320         if (getsockname(sock, (struct sockaddr *)server, &length) != 0) {
2321                 return -1;
2322         }
2323         length = sizeof(*client);
2324         if (getpeername(sock, (struct sockaddr *)client, &length) != 0) {
2325                 return -1;
2326         }
2327         return 0;
2328 }
2329 #endif
2330
2331 /*
2332  * Send keepalive packets to our client
2333  */
2334 static bool keepalive_fn(const struct timeval *now, void *private_data)
2335 {
2336         struct smbd_server_connection *sconn = talloc_get_type_abort(
2337                 private_data, struct smbd_server_connection);
2338         bool ret;
2339
2340         if (sconn->using_smb2) {
2341                 /* Don't do keepalives on an SMB2 connection. */
2342                 return false;
2343         }
2344
2345         smbd_lock_socket(sconn);
2346         ret = send_keepalive(sconn->sock);
2347         smbd_unlock_socket(sconn);
2348
2349         if (!ret) {
2350                 char addr[INET6_ADDRSTRLEN];
2351                 /*
2352                  * Try and give an error message saying what
2353                  * client failed.
2354                  */
2355                 DEBUG(0, ("send_keepalive failed for client %s. "
2356                           "Error %s - exiting\n",
2357                           get_peer_addr(sconn->sock, addr, sizeof(addr)),
2358                           strerror(errno)));
2359                 return False;
2360         }
2361         return True;
2362 }
2363
2364 /*
2365  * Do the recurring check if we're idle
2366  */
2367 static bool deadtime_fn(const struct timeval *now, void *private_data)
2368 {
2369         struct smbd_server_connection *sconn =
2370                 (struct smbd_server_connection *)private_data;
2371
2372         if ((conn_num_open(sconn) == 0)
2373             || (conn_idle_all(sconn, now->tv_sec))) {
2374                 DEBUG( 2, ( "Closing idle connection\n" ) );
2375                 messaging_send(sconn->msg_ctx,
2376                                messaging_server_id(sconn->msg_ctx),
2377                                MSG_SHUTDOWN, &data_blob_null);
2378                 return False;
2379         }
2380
2381         return True;
2382 }
2383
2384 /*
2385  * Do the recurring log file and smb.conf reload checks.
2386  */
2387
2388 static bool housekeeping_fn(const struct timeval *now, void *private_data)
2389 {
2390         struct smbd_server_connection *sconn = talloc_get_type_abort(
2391                 private_data, struct smbd_server_connection);
2392
2393         DEBUG(5, ("housekeeping\n"));
2394
2395         change_to_root_user();
2396
2397         /* update printer queue caches if necessary */
2398         update_monitored_printq_cache(sconn->msg_ctx);
2399
2400         /* check if we need to reload services */
2401         check_reload(sconn, time_mono(NULL));
2402
2403         /* Change machine password if neccessary. */
2404         attempt_machine_password_change();
2405
2406         /*
2407          * Force a log file check.
2408          */
2409         force_check_log_size();
2410         check_log_size();
2411         return true;
2412 }
2413
2414 /*
2415  * Read an smb packet in the echo handler child, giving the parent
2416  * smbd one second to react once the socket becomes readable.
2417  */
2418
2419 struct smbd_echo_read_state {
2420         struct tevent_context *ev;
2421         struct smbd_server_connection *sconn;
2422
2423         char *buf;
2424         size_t buflen;
2425         uint32_t seqnum;
2426 };
2427
2428 static void smbd_echo_read_readable(struct tevent_req *subreq);
2429 static void smbd_echo_read_waited(struct tevent_req *subreq);
2430
2431 static struct tevent_req *smbd_echo_read_send(
2432         TALLOC_CTX *mem_ctx, struct tevent_context *ev,
2433         struct smbd_server_connection *sconn)
2434 {
2435         struct tevent_req *req, *subreq;
2436         struct smbd_echo_read_state *state;
2437
2438         req = tevent_req_create(mem_ctx, &state,
2439                                 struct smbd_echo_read_state);
2440         if (req == NULL) {
2441                 return NULL;
2442         }
2443         state->ev = ev;
2444         state->sconn = sconn;
2445
2446         subreq = wait_for_read_send(state, ev, sconn->sock);
2447         if (tevent_req_nomem(subreq, req)) {
2448                 return tevent_req_post(req, ev);
2449         }
2450         tevent_req_set_callback(subreq, smbd_echo_read_readable, req);
2451         return req;
2452 }
2453
2454 static void smbd_echo_read_readable(struct tevent_req *subreq)
2455 {
2456         struct tevent_req *req = tevent_req_callback_data(
2457                 subreq, struct tevent_req);
2458         struct smbd_echo_read_state *state = tevent_req_data(
2459                 req, struct smbd_echo_read_state);
2460         bool ok;
2461         int err;
2462
2463         ok = wait_for_read_recv(subreq, &err);
2464         TALLOC_FREE(subreq);
2465         if (!ok) {
2466                 tevent_req_nterror(req, map_nt_error_from_unix(err));
2467                 return;
2468         }
2469
2470         /*
2471          * Give the parent smbd one second to step in
2472          */
2473
2474         subreq = tevent_wakeup_send(
2475                 state, state->ev, timeval_current_ofs(1, 0));
2476         if (tevent_req_nomem(subreq, req)) {
2477                 return;
2478         }
2479         tevent_req_set_callback(subreq, smbd_echo_read_waited, req);
2480 }
2481
2482 static void smbd_echo_read_waited(struct tevent_req *subreq)
2483 {
2484         struct tevent_req *req = tevent_req_callback_data(
2485                 subreq, struct tevent_req);
2486         struct smbd_echo_read_state *state = tevent_req_data(
2487                 req, struct smbd_echo_read_state);
2488         struct smbd_server_connection *sconn = state->sconn;
2489         bool ok;
2490         NTSTATUS status;
2491         size_t unread = 0;
2492         bool encrypted;
2493
2494         ok = tevent_wakeup_recv(subreq);
2495         TALLOC_FREE(subreq);
2496         if (!ok) {
2497                 tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
2498                 return;
2499         }
2500
2501         ok = smbd_lock_socket_internal(sconn);
2502         if (!ok) {
2503                 tevent_req_nterror(req, map_nt_error_from_unix(errno));
2504                 DEBUG(0, ("%s: failed to lock socket\n", __location__));
2505                 return;
2506         }
2507
2508         if (!fd_is_readable(sconn->sock)) {
2509                 DEBUG(10,("echo_handler[%d] the parent smbd was faster\n",
2510                           (int)sys_getpid()));
2511
2512                 ok = smbd_unlock_socket_internal(sconn);
2513                 if (!ok) {
2514                         tevent_req_nterror(req, map_nt_error_from_unix(errno));
2515                         DEBUG(1, ("%s: failed to unlock socket\n",
2516                                 __location__));
2517                         return;
2518                 }
2519
2520                 subreq = wait_for_read_send(state, state->ev, sconn->sock);
2521                 if (tevent_req_nomem(subreq, req)) {
2522                         return;
2523                 }
2524                 tevent_req_set_callback(subreq, smbd_echo_read_readable, req);
2525                 return;
2526         }
2527
2528         status = receive_smb_talloc(state, sconn, sconn->sock, &state->buf,
2529                                     0 /* timeout */,
2530                                     &unread,
2531                                     &encrypted,
2532                                     &state->buflen,
2533                                     &state->seqnum,
2534                                     false /* trusted_channel*/);
2535
2536         if (tevent_req_nterror(req, status)) {
2537                 tevent_req_nterror(req, status);
2538                 DEBUG(1, ("echo_handler[%d]: receive_smb_raw_talloc failed: %s\n",
2539                           (int)sys_getpid(), nt_errstr(status)));
2540                 return;
2541         }
2542
2543         ok = smbd_unlock_socket_internal(sconn);
2544         if (!ok) {
2545                 tevent_req_nterror(req, map_nt_error_from_unix(errno));
2546                 DEBUG(1, ("%s: failed to unlock socket\n", __location__));
2547                 return;
2548         }
2549         tevent_req_done(req);
2550 }
2551
2552 static NTSTATUS smbd_echo_read_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
2553                                     char **pbuf, size_t *pbuflen, uint32_t *pseqnum)
2554 {
2555         struct smbd_echo_read_state *state = tevent_req_data(
2556                 req, struct smbd_echo_read_state);
2557         NTSTATUS status;
2558
2559         if (tevent_req_is_nterror(req, &status)) {
2560                 return status;
2561         }
2562         *pbuf = talloc_move(mem_ctx, &state->buf);
2563         *pbuflen = state->buflen;
2564         *pseqnum = state->seqnum;
2565         return NT_STATUS_OK;
2566 }
2567
2568 struct smbd_echo_state {
2569         struct tevent_context *ev;
2570         struct iovec *pending;
2571         struct smbd_server_connection *sconn;
2572         int parent_pipe;
2573
2574         struct tevent_fd *parent_fde;
2575
2576         struct tevent_req *write_req;
2577 };
2578
2579 static void smbd_echo_writer_done(struct tevent_req *req);
2580
2581 static void smbd_echo_activate_writer(struct smbd_echo_state *state)
2582 {
2583         int num_pending;
2584
2585         if (state->write_req != NULL) {
2586                 return;
2587         }
2588
2589         num_pending = talloc_array_length(state->pending);
2590         if (num_pending == 0) {
2591                 return;
2592         }
2593
2594         state->write_req = writev_send(state, state->ev, NULL,
2595                                        state->parent_pipe, false,
2596                                        state->pending, num_pending);
2597         if (state->write_req == NULL) {
2598                 DEBUG(1, ("writev_send failed\n"));
2599                 exit(1);
2600         }
2601
2602         talloc_steal(state->write_req, state->pending);
2603         state->pending = NULL;
2604
2605         tevent_req_set_callback(state->write_req, smbd_echo_writer_done,
2606                                 state);
2607 }
2608
2609 static void smbd_echo_writer_done(struct tevent_req *req)
2610 {
2611         struct smbd_echo_state *state = tevent_req_callback_data(
2612                 req, struct smbd_echo_state);
2613         ssize_t written;
2614         int err;
2615
2616         written = writev_recv(req, &err);
2617         TALLOC_FREE(req);
2618         state->write_req = NULL;
2619         if (written == -1) {
2620                 DEBUG(1, ("writev to parent failed: %s\n", strerror(err)));
2621                 exit(1);
2622         }
2623         DEBUG(10,("echo_handler[%d]: forwarded pdu to main\n", (int)sys_getpid()));
2624         smbd_echo_activate_writer(state);
2625 }
2626
2627 static bool smbd_echo_reply(struct smbd_echo_state *state,
2628                             uint8_t *inbuf, size_t inbuf_len,
2629                             uint32_t seqnum)
2630 {
2631         struct smb_request req;
2632         uint16_t num_replies;
2633         char *outbuf;
2634         bool ok;
2635
2636         if ((inbuf_len == 4) && (CVAL(inbuf, 0) == NBSSkeepalive)) {
2637                 DEBUG(10, ("Got netbios keepalive\n"));
2638                 /*
2639                  * Just swallow it
2640                  */
2641                 return true;
2642         }
2643
2644         if (inbuf_len < smb_size) {
2645                 DEBUG(10, ("Got short packet: %d bytes\n", (int)inbuf_len));
2646                 return false;
2647         }
2648         if (!valid_smb_header(state->sconn, inbuf)) {
2649                 DEBUG(10, ("Got invalid SMB header\n"));
2650                 return false;
2651         }
2652
2653         if (!init_smb_request(&req, state->sconn, inbuf, 0, false,
2654                               seqnum)) {
2655                 return false;
2656         }
2657         req.inbuf = inbuf;
2658
2659         DEBUG(10, ("smbecho handler got cmd %d (%s)\n", (int)req.cmd,
2660                    smb_messages[req.cmd].name
2661                    ? smb_messages[req.cmd].name : "unknown"));
2662
2663         if (req.cmd != SMBecho) {
2664                 return false;
2665         }
2666         if (req.wct < 1) {
2667                 return false;
2668         }
2669
2670         num_replies = SVAL(req.vwv+0, 0);
2671         if (num_replies != 1) {
2672                 /* Not a Windows "Hey, you're still there?" request */
2673                 return false;
2674         }
2675
2676         if (!create_outbuf(talloc_tos(), &req, (const char *)req.inbuf, &outbuf,
2677                            1, req.buflen)) {
2678                 DEBUG(10, ("create_outbuf failed\n"));
2679                 return false;
2680         }
2681         req.outbuf = (uint8_t *)outbuf;
2682
2683         SSVAL(req.outbuf, smb_vwv0, num_replies);
2684
2685         if (req.buflen > 0) {
2686                 memcpy(smb_buf(req.outbuf), req.buf, req.buflen);
2687         }
2688
2689         ok = srv_send_smb(req.sconn,
2690                           (char *)outbuf,
2691                           true, seqnum+1,
2692                           false, &req.pcd);
2693         TALLOC_FREE(outbuf);
2694         if (!ok) {
2695                 exit(1);
2696         }
2697
2698         return true;
2699 }
2700
2701 static void smbd_echo_exit(struct tevent_context *ev,
2702                            struct tevent_fd *fde, uint16_t flags,
2703                            void *private_data)
2704 {
2705         DEBUG(2, ("smbd_echo_exit: lost connection to parent\n"));
2706         exit(0);
2707 }
2708
2709 static void smbd_echo_got_packet(struct tevent_req *req);
2710
2711 static void smbd_echo_loop(struct smbd_server_connection *sconn,
2712                            int parent_pipe)
2713 {
2714         struct smbd_echo_state *state;
2715         struct tevent_req *read_req;
2716
2717         state = talloc_zero(sconn, struct smbd_echo_state);
2718         if (state == NULL) {
2719                 DEBUG(1, ("talloc failed\n"));
2720                 return;
2721         }
2722         state->sconn = sconn;
2723         state->parent_pipe = parent_pipe;
2724         state->ev = s3_tevent_context_init(state);
2725         if (state->ev == NULL) {
2726                 DEBUG(1, ("tevent_context_init failed\n"));
2727                 TALLOC_FREE(state);
2728                 return;
2729         }
2730         state->parent_fde = tevent_add_fd(state->ev, state, parent_pipe,
2731                                         TEVENT_FD_READ, smbd_echo_exit,
2732                                         state);
2733         if (state->parent_fde == NULL) {
2734                 DEBUG(1, ("tevent_add_fd failed\n"));
2735                 TALLOC_FREE(state);
2736                 return;
2737         }
2738
2739         read_req = smbd_echo_read_send(state, state->ev, sconn);
2740         if (read_req == NULL) {
2741                 DEBUG(1, ("smbd_echo_read_send failed\n"));
2742                 TALLOC_FREE(state);
2743                 return;
2744         }
2745         tevent_req_set_callback(read_req, smbd_echo_got_packet, state);
2746
2747         while (true) {
2748                 if (tevent_loop_once(state->ev) == -1) {
2749                         DEBUG(1, ("tevent_loop_once failed: %s\n",
2750                                   strerror(errno)));
2751                         break;
2752                 }
2753         }
2754         TALLOC_FREE(state);
2755 }
2756
2757 static void smbd_echo_got_packet(struct tevent_req *req)
2758 {
2759         struct smbd_echo_state *state = tevent_req_callback_data(
2760                 req, struct smbd_echo_state);
2761         NTSTATUS status;
2762         char *buf = NULL;
2763         size_t buflen = 0;
2764         uint32_t seqnum = 0;
2765         bool reply;
2766
2767         status = smbd_echo_read_recv(req, state, &buf, &buflen, &seqnum);
2768         TALLOC_FREE(req);
2769         if (!NT_STATUS_IS_OK(status)) {
2770                 DEBUG(1, ("smbd_echo_read_recv returned %s\n",
2771                           nt_errstr(status)));
2772                 exit(1);
2773         }
2774
2775         reply = smbd_echo_reply(state, (uint8_t *)buf, buflen, seqnum);
2776         if (!reply) {
2777                 size_t num_pending;
2778                 struct iovec *tmp;
2779                 struct iovec *iov;
2780
2781                 num_pending = talloc_array_length(state->pending);
2782                 tmp = talloc_realloc(state, state->pending, struct iovec,
2783                                      num_pending+1);
2784                 if (tmp == NULL) {
2785                         DEBUG(1, ("talloc_realloc failed\n"));
2786                         exit(1);
2787                 }
2788                 state->pending = tmp;
2789
2790                 if (buflen >= smb_size) {
2791                         /*
2792                          * place the seqnum in the packet so that the main process
2793                          * can reply with signing
2794                          */
2795                         SIVAL(buf, smb_ss_field, seqnum);
2796                         SIVAL(buf, smb_ss_field+4, NT_STATUS_V(NT_STATUS_OK));
2797                 }
2798
2799                 iov = &state->pending[num_pending];
2800                 iov->iov_base = buf;
2801                 iov->iov_len = buflen;
2802
2803                 DEBUG(10,("echo_handler[%d]: forward to main\n",
2804                           (int)sys_getpid()));
2805                 smbd_echo_activate_writer(state);
2806         }
2807
2808         req = smbd_echo_read_send(state, state->ev, state->sconn);
2809         if (req == NULL) {
2810                 DEBUG(1, ("smbd_echo_read_send failed\n"));
2811                 exit(1);
2812         }
2813         tevent_req_set_callback(req, smbd_echo_got_packet, state);
2814 }
2815
2816
2817 /*
2818  * Handle SMBecho requests in a forked child process
2819  */
2820 bool fork_echo_handler(struct smbd_server_connection *sconn)
2821 {
2822         int listener_pipe[2];
2823         int res;
2824         pid_t child;
2825
2826         res = pipe(listener_pipe);
2827         if (res == -1) {
2828                 DEBUG(1, ("pipe() failed: %s\n", strerror(errno)));
2829                 return false;
2830         }
2831         sconn->smb1.echo_handler.socket_lock_fd = create_unlink_tmp(lp_lockdir());
2832         if (sconn->smb1.echo_handler.socket_lock_fd == -1) {
2833                 DEBUG(1, ("Could not create lock fd: %s\n", strerror(errno)));
2834                 goto fail;
2835         }
2836
2837         child = sys_fork();
2838         if (child == 0) {
2839                 NTSTATUS status;
2840
2841                 close(listener_pipe[0]);
2842                 set_blocking(listener_pipe[1], false);
2843
2844                 status = reinit_after_fork(sconn->msg_ctx,
2845                                            sconn->ev_ctx,
2846                                            false);
2847                 if (!NT_STATUS_IS_OK(status)) {
2848                         DEBUG(1, ("reinit_after_fork failed: %s\n",
2849                                   nt_errstr(status)));
2850                         exit(1);
2851                 }
2852                 smbd_echo_loop(sconn, listener_pipe[1]);
2853                 exit(0);
2854         }
2855         close(listener_pipe[1]);
2856         listener_pipe[1] = -1;
2857         sconn->smb1.echo_handler.trusted_fd = listener_pipe[0];
2858
2859         DEBUG(10,("fork_echo_handler: main[%d] echo_child[%d]\n", (int)sys_getpid(), child));
2860
2861         /*
2862          * Without smb signing this is the same as the normal smbd
2863          * listener. This needs to change once signing comes in.
2864          */
2865         sconn->smb1.echo_handler.trusted_fde = tevent_add_fd(sconn->ev_ctx,
2866                                         sconn,
2867                                         sconn->smb1.echo_handler.trusted_fd,
2868                                         TEVENT_FD_READ,
2869                                         smbd_server_echo_handler,
2870                                         sconn);
2871         if (sconn->smb1.echo_handler.trusted_fde == NULL) {
2872                 DEBUG(1, ("event_add_fd failed\n"));
2873                 goto fail;
2874         }
2875
2876         return true;
2877
2878 fail:
2879         if (listener_pipe[0] != -1) {
2880                 close(listener_pipe[0]);
2881         }
2882         if (listener_pipe[1] != -1) {
2883                 close(listener_pipe[1]);
2884         }
2885         sconn->smb1.echo_handler.trusted_fd = -1;
2886         if (sconn->smb1.echo_handler.socket_lock_fd != -1) {
2887                 close(sconn->smb1.echo_handler.socket_lock_fd);
2888         }
2889         sconn->smb1.echo_handler.trusted_fd = -1;
2890         sconn->smb1.echo_handler.socket_lock_fd = -1;
2891         return false;
2892 }
2893
2894 #if CLUSTER_SUPPORT
2895
2896 static NTSTATUS smbd_register_ips(struct smbd_server_connection *sconn,
2897                                   struct sockaddr_storage *srv,
2898                                   struct sockaddr_storage *clnt)
2899 {
2900         struct ctdbd_connection *cconn;
2901         char tmp_addr[INET6_ADDRSTRLEN];
2902         char *addr;
2903
2904         cconn = messaging_ctdbd_connection();
2905         if (cconn == NULL) {
2906                 return NT_STATUS_NO_MEMORY;
2907         }
2908
2909         client_socket_addr(sconn->sock, tmp_addr, sizeof(tmp_addr));
2910         addr = talloc_strdup(cconn, tmp_addr);
2911         if (addr == NULL) {
2912                 return NT_STATUS_NO_MEMORY;
2913         }
2914         return ctdbd_register_ips(cconn, srv, clnt, release_ip, addr);
2915 }
2916
2917 #endif
2918
2919 static bool uid_in_use(const struct user_struct *user, uid_t uid)
2920 {
2921         while (user) {
2922                 if (user->session_info &&
2923                     (user->session_info->unix_token->uid == uid)) {
2924                         return true;
2925                 }
2926                 user = user->next;
2927         }
2928         return false;
2929 }
2930
2931 static bool gid_in_use(const struct user_struct *user, gid_t gid)
2932 {
2933         while (user) {
2934                 if (user->session_info != NULL) {
2935                         int i;
2936                         struct security_unix_token *utok;
2937
2938                         utok = user->session_info->unix_token;
2939                         if (utok->gid == gid) {
2940                                 return true;
2941                         }
2942                         for(i=0; i<utok->ngroups; i++) {
2943                                 if (utok->groups[i] == gid) {
2944                                         return true;
2945                                 }
2946                         }
2947                 }
2948                 user = user->next;
2949         }
2950         return false;
2951 }
2952
2953 static bool sid_in_use(const struct user_struct *user,
2954                        const struct dom_sid *psid)
2955 {
2956         while (user) {
2957                 struct security_token *tok;
2958
2959                 if (user->session_info == NULL) {
2960                         continue;
2961                 }
2962                 tok = user->session_info->security_token;
2963                 if (tok == NULL) {
2964                         /*
2965                          * Not sure session_info->security_token can
2966                          * ever be NULL. This check might be not
2967                          * necessary.
2968                          */
2969                         continue;
2970                 }
2971                 if (security_token_has_sid(tok, psid)) {
2972                         return true;
2973                 }
2974                 user = user->next;
2975         }
2976         return false;
2977 }
2978
2979 static bool id_in_use(const struct user_struct *user,
2980                       const struct id_cache_ref *id)
2981 {
2982         switch(id->type) {
2983         case UID:
2984                 return uid_in_use(user, id->id.uid);
2985         case GID:
2986                 return gid_in_use(user, id->id.gid);
2987         case SID:
2988                 return sid_in_use(user, &id->id.sid);
2989         default:
2990                 break;
2991         }
2992         return false;
2993 }
2994
2995 static void smbd_id_cache_kill(struct messaging_context *msg_ctx,
2996                                void *private_data,
2997                                uint32_t msg_type,
2998                                struct server_id server_id,
2999                                DATA_BLOB* data)
3000 {
3001         const char *msg = (data && data->data)
3002                 ? (const char *)data->data : "<NULL>";
3003         struct user_struct *validated_users;
3004         struct id_cache_ref id;
3005         struct smbd_server_connection *sconn =
3006                 talloc_get_type_abort(private_data,
3007                 struct smbd_server_connection);
3008
3009         validated_users = sconn->smb1.sessions.validated_users;
3010
3011         if (!id_cache_ref_parse(msg, &id)) {
3012                 DEBUG(0, ("Invalid ?ID: %s\n", msg));
3013                 return;
3014         }
3015
3016         if (id_in_use(validated_users, &id)) {
3017                 exit_server_cleanly(msg);
3018         }
3019         id_cache_delete_from_cache(&id);
3020 }
3021
3022 /****************************************************************************
3023  Process commands from the client
3024 ****************************************************************************/
3025
3026 void smbd_process(struct tevent_context *ev_ctx,
3027                   struct smbd_server_connection *sconn)
3028 {
3029         TALLOC_CTX *frame = talloc_stackframe();
3030         struct sockaddr_storage ss;
3031         struct sockaddr *sa = NULL;
3032         socklen_t sa_socklen;
3033         struct tsocket_address *local_address = NULL;
3034         struct tsocket_address *remote_address = NULL;
3035         const char *locaddr = NULL;
3036         const char *remaddr = NULL;
3037         char *rhost;
3038         int ret;
3039
3040         if (lp_maxprotocol() >= PROTOCOL_SMB2_02) {
3041                 /*
3042                  * We're not making the decision here,
3043                  * we're just allowing the client
3044                  * to decide between SMB1 and SMB2
3045                  * with the first negprot
3046                  * packet.
3047                  */
3048                 sconn->using_smb2 = true;
3049         }
3050
3051         /* Ensure child is set to blocking mode */
3052         set_blocking(sconn->sock,True);
3053
3054         set_socket_options(sconn->sock, "SO_KEEPALIVE");
3055         set_socket_options(sconn->sock, lp_socket_options());
3056
3057         sa = (struct sockaddr *)(void *)&ss;
3058         sa_socklen = sizeof(ss);
3059         ret = getpeername(sconn->sock, sa, &sa_socklen);
3060         if (ret != 0) {
3061                 int level = (errno == ENOTCONN)?2:0;
3062                 DEBUG(level,("getpeername() failed - %s\n", strerror(errno)));
3063                 exit_server_cleanly("getpeername() failed.\n");
3064         }
3065         ret = tsocket_address_bsd_from_sockaddr(sconn,
3066                                                 sa, sa_socklen,
3067                                                 &remote_address);
3068         if (ret != 0) {
3069                 DEBUG(0,("%s: tsocket_address_bsd_from_sockaddr remote failed - %s\n",
3070                         __location__, strerror(errno)));
3071                 exit_server_cleanly("tsocket_address_bsd_from_sockaddr remote failed.\n");
3072         }
3073
3074         sa = (struct sockaddr *)(void *)&ss;
3075         sa_socklen = sizeof(ss);
3076         ret = getsockname(sconn->sock, sa, &sa_socklen);
3077         if (ret != 0) {
3078                 int level = (errno == ENOTCONN)?2:0;
3079                 DEBUG(level,("getsockname() failed - %s\n", strerror(errno)));
3080                 exit_server_cleanly("getsockname() failed.\n");
3081         }
3082         ret = tsocket_address_bsd_from_sockaddr(sconn,
3083                                                 sa, sa_socklen,
3084                                                 &local_address);
3085         if (ret != 0) {
3086                 DEBUG(0,("%s: tsocket_address_bsd_from_sockaddr remote failed - %s\n",
3087                         __location__, strerror(errno)));
3088                 exit_server_cleanly("tsocket_address_bsd_from_sockaddr remote failed.\n");
3089         }
3090
3091         sconn->local_address = local_address;
3092         sconn->remote_address = remote_address;
3093
3094         if (tsocket_address_is_inet(local_address, "ip")) {
3095                 locaddr = tsocket_address_inet_addr_string(
3096                                 sconn->local_address,
3097                                 talloc_tos());
3098                 if (locaddr == NULL) {
3099                         DEBUG(0,("%s: tsocket_address_inet_addr_string local failed - %s\n",
3100                                  __location__, strerror(errno)));
3101                         exit_server_cleanly("tsocket_address_inet_addr_string local failed.\n");
3102                 }
3103         } else {
3104                 locaddr = "0.0.0.0";
3105         }
3106
3107         if (tsocket_address_is_inet(remote_address, "ip")) {
3108                 remaddr = tsocket_address_inet_addr_string(
3109                                 sconn->remote_address,
3110                                 talloc_tos());
3111                 if (remaddr == NULL) {
3112                         DEBUG(0,("%s: tsocket_address_inet_addr_string remote failed - %s\n",
3113                                  __location__, strerror(errno)));
3114                         exit_server_cleanly("tsocket_address_inet_addr_string remote failed.\n");
3115                 }
3116         } else {
3117                 remaddr = "0.0.0.0";
3118         }
3119
3120         /* this is needed so that we get decent entries
3121            in smbstatus for port 445 connects */
3122         set_remote_machine_name(remaddr, false);
3123         reload_services(sconn, conn_snum_used, true);
3124
3125         /*
3126          * Before the first packet, check the global hosts allow/ hosts deny
3127          * parameters before doing any parsing of packets passed to us by the
3128          * client. This prevents attacks on our parsing code from hosts not in
3129          * the hosts allow list.
3130          */
3131
3132         ret = get_remote_hostname(remote_address,
3133                                   &rhost,
3134                                   talloc_tos());
3135         if (ret < 0) {
3136                 DEBUG(0,("%s: get_remote_hostname failed - %s\n",
3137                         __location__, strerror(errno)));
3138                 exit_server_cleanly("get_remote_hostname failed.\n");
3139         }
3140         if (strequal(rhost, "UNKNOWN")) {
3141                 rhost = talloc_strdup(talloc_tos(), remaddr);
3142         }
3143         sconn->remote_hostname = talloc_move(sconn, &rhost);
3144
3145         sub_set_socket_ids(remaddr,
3146                            sconn->remote_hostname,
3147                            locaddr);
3148
3149         if (!allow_access(lp_hostsdeny(-1), lp_hostsallow(-1),
3150                           sconn->remote_hostname,
3151                           remaddr)) {
3152                 /*
3153                  * send a negative session response "not listening on calling
3154                  * name"
3155                  */
3156                 unsigned char buf[5] = {0x83, 0, 0, 1, 0x81};
3157                 DEBUG( 1, ("Connection denied from %s to %s\n",
3158                            tsocket_address_string(remote_address, talloc_tos()),
3159                            tsocket_address_string(local_address, talloc_tos())));
3160                 (void)srv_send_smb(sconn,(char *)buf, false,
3161                                    0, false, NULL);
3162                 exit_server_cleanly("connection denied");
3163         }
3164
3165         DEBUG(10, ("Connection allowed from %s to %s\n",
3166                    tsocket_address_string(remote_address, talloc_tos()),
3167                    tsocket_address_string(local_address, talloc_tos())));
3168
3169         init_modules();
3170
3171         smb_perfcount_init();
3172
3173         if (!init_account_policy()) {
3174                 exit_server("Could not open account policy tdb.\n");
3175         }
3176
3177         if (*lp_rootdir()) {
3178                 if (chroot(lp_rootdir()) != 0) {
3179                         DEBUG(0,("Failed to change root to %s\n", lp_rootdir()));
3180                         exit_server("Failed to chroot()");
3181                 }
3182                 if (chdir("/") == -1) {
3183                         DEBUG(0,("Failed to chdir to / on chroot to %s\n", lp_rootdir()));
3184                         exit_server("Failed to chroot()");
3185                 }
3186                 DEBUG(0,("Changed root to %s\n", lp_rootdir()));
3187         }
3188
3189         if (!srv_init_signing(sconn)) {
3190                 exit_server("Failed to init smb_signing");
3191         }
3192
3193         /* Setup oplocks */
3194         if (!init_oplocks(sconn))
3195                 exit_server("Failed to init oplocks");
3196
3197         /* register our message handlers */
3198         messaging_register(sconn->msg_ctx, sconn,
3199                            MSG_SMB_FORCE_TDIS, msg_force_tdis);
3200         messaging_register(sconn->msg_ctx, sconn,
3201                            MSG_SMB_CLOSE_FILE, msg_close_file);
3202         messaging_register(sconn->msg_ctx, sconn,
3203                            MSG_SMB_FILE_RENAME, msg_file_was_renamed);
3204
3205         id_cache_register_msgs(sconn->msg_ctx);
3206         messaging_deregister(sconn->msg_ctx, ID_CACHE_KILL, NULL);
3207         messaging_register(sconn->msg_ctx, sconn,
3208                            ID_CACHE_KILL, smbd_id_cache_kill);
3209
3210         messaging_deregister(sconn->msg_ctx,
3211                              MSG_SMB_CONF_UPDATED, sconn->ev_ctx);
3212         messaging_register(sconn->msg_ctx, sconn,
3213                            MSG_SMB_CONF_UPDATED, smbd_conf_updated);
3214
3215         /*
3216          * Use the default MSG_DEBUG handler to avoid rebroadcasting
3217          * MSGs to all child processes
3218          */
3219         messaging_deregister(sconn->msg_ctx,
3220                              MSG_DEBUG, NULL);
3221         messaging_register(sconn->msg_ctx, NULL,
3222                            MSG_DEBUG, debug_message);
3223
3224         if ((lp_keepalive() != 0)
3225             && !(event_add_idle(ev_ctx, NULL,
3226                                 timeval_set(lp_keepalive(), 0),
3227                                 "keepalive", keepalive_fn,
3228                                 sconn))) {
3229                 DEBUG(0, ("Could not add keepalive event\n"));
3230                 exit(1);
3231         }
3232
3233         if (!(event_add_idle(ev_ctx, NULL,
3234                              timeval_set(IDLE_CLOSED_TIMEOUT, 0),
3235                              "deadtime", deadtime_fn, sconn))) {
3236                 DEBUG(0, ("Could not add deadtime event\n"));
3237                 exit(1);
3238         }
3239
3240         if (!(event_add_idle(ev_ctx, NULL,
3241                              timeval_set(SMBD_HOUSEKEEPING_INTERVAL, 0),
3242                              "housekeeping", housekeeping_fn, sconn))) {
3243                 DEBUG(0, ("Could not add housekeeping event\n"));
3244                 exit(1);
3245         }
3246
3247 #ifdef CLUSTER_SUPPORT
3248
3249         if (lp_clustering()) {
3250                 /*
3251                  * We need to tell ctdb about our client's TCP
3252                  * connection, so that for failover ctdbd can send
3253                  * tickle acks, triggering a reconnection by the
3254                  * client.
3255                  */
3256
3257                 struct sockaddr_storage srv, clnt;
3258
3259                 if (client_get_tcp_info(sconn->sock, &srv, &clnt) == 0) {
3260                         NTSTATUS status;
3261                         status = smbd_register_ips(sconn, &srv, &clnt);
3262                         if (!NT_STATUS_IS_OK(status)) {
3263                                 DEBUG(0, ("ctdbd_register_ips failed: %s\n",
3264                                           nt_errstr(status)));
3265                         }
3266                 } else
3267                 {
3268                         DEBUG(0,("Unable to get tcp info for "
3269                                  "CTDB_CONTROL_TCP_CLIENT: %s\n",
3270                                  strerror(errno)));
3271                 }
3272         }
3273
3274 #endif
3275
3276         sconn->nbt.got_session = false;
3277
3278         sconn->smb1.negprot.max_recv = MIN(lp_maxxmit(),BUFFER_SIZE);
3279
3280         sconn->smb1.sessions.done_sesssetup = false;
3281         sconn->smb1.sessions.max_send = BUFFER_SIZE;
3282         sconn->smb1.sessions.last_session_tag = UID_FIELD_INVALID;
3283         /* users from session setup */
3284         sconn->smb1.sessions.session_userlist = NULL;
3285         /* workgroup from session setup. */
3286         sconn->smb1.sessions.session_workgroup = NULL;
3287         /* this holds info on user ids that are already validated for this VC */
3288         sconn->smb1.sessions.validated_users = NULL;
3289         sconn->smb1.sessions.next_vuid = VUID_OFFSET;
3290         sconn->smb1.sessions.num_validated_vuids = 0;
3291
3292         conn_init(sconn);
3293         if (!init_dptrs(sconn)) {
3294                 exit_server("init_dptrs() failed");
3295         }
3296
3297         sconn->smb1.fde = event_add_fd(ev_ctx,
3298                                                   sconn,
3299                                                   sconn->sock,
3300                                                   EVENT_FD_READ,
3301                                                   smbd_server_connection_handler,
3302                                                   sconn);
3303         if (!sconn->smb1.fde) {
3304                 exit_server("failed to create smbd_server_connection fde");
3305         }
3306
3307         TALLOC_FREE(frame);
3308
3309         while (True) {
3310                 frame = talloc_stackframe_pool(8192);
3311
3312                 errno = 0;
3313                 if (tevent_loop_once(ev_ctx) == -1) {
3314                         if (errno != EINTR) {
3315                                 DEBUG(3, ("tevent_loop_once failed: %s,"
3316                                           " exiting\n", strerror(errno) ));
3317                                 break;
3318                         }
3319                 }
3320
3321                 TALLOC_FREE(frame);
3322         }
3323
3324         exit_server_cleanly(NULL);
3325 }
3326
3327 bool req_is_in_chain(struct smb_request *req)
3328 {
3329         if (req->vwv != (const uint16_t *)(req->inbuf+smb_vwv)) {
3330                 /*
3331                  * We're right now handling a subsequent request, so we must
3332                  * be in a chain
3333                  */
3334                 return true;
3335         }
3336
3337         if (!is_andx_req(req->cmd)) {
3338                 return false;
3339         }
3340
3341         if (req->wct < 2) {
3342                 /*
3343                  * Okay, an illegal request, but definitely not chained :-)
3344                  */
3345                 return false;
3346         }
3347
3348         return (CVAL(req->vwv+0, 0) != 0xFF);
3349 }