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 andx_cmd_ofs;
1794
1795
1796         old_size = talloc_get_size(*poutbuf);
1797
1798         if ((old_size % 4) != 0) {
1799                 /*
1800                  * Align the wct field of subsequent requests to a 4-byte
1801                  * boundary
1802                  */
1803                 chain_padding = 4 - (old_size % 4);
1804         }
1805
1806         /*
1807          * After the old request comes the new wct field (1 byte), the vwv's
1808          * and the num_bytes field.
1809          */
1810
1811         new_size = old_size + chain_padding + 1 + wct * sizeof(uint16_t) + 2;
1812         new_size += num_bytes;
1813
1814         if ((smb_command != SMBwriteX) && (new_size > 0xffff)) {
1815                 DEBUG(1, ("smb_splice_chain: %u bytes won't fit\n",
1816                           (unsigned)new_size));
1817                 return false;
1818         }
1819
1820         outbuf = talloc_realloc(NULL, *poutbuf, uint8_t, new_size);
1821         if (outbuf == NULL) {
1822                 DEBUG(0, ("talloc failed\n"));
1823                 return false;
1824         }
1825         *poutbuf = outbuf;
1826
1827         if (!find_andx_cmd_ofs(outbuf, &andx_cmd_ofs)) {
1828                 DEBUG(1, ("invalid command chain\n"));
1829                 *poutbuf = talloc_realloc(NULL, *poutbuf, uint8_t, old_size);
1830                 return false;
1831         }
1832
1833         if (chain_padding != 0) {
1834                 memset(outbuf + old_size, 0, chain_padding);
1835                 old_size += chain_padding;
1836         }
1837
1838         SCVAL(outbuf, andx_cmd_ofs, smb_command);
1839         SSVAL(outbuf, andx_cmd_ofs + 2, old_size - 4);
1840
1841         ofs = old_size;
1842
1843         /*
1844          * Push the chained request:
1845          *
1846          * wct field
1847          */
1848
1849         SCVAL(outbuf, ofs, wct);
1850         ofs += 1;
1851
1852         /*
1853          * vwv array
1854          */
1855
1856         memcpy(outbuf + ofs, vwv, sizeof(uint16_t) * wct);
1857         ofs += sizeof(uint16_t) * wct;
1858
1859         /*
1860          * bcc (byte count)
1861          */
1862
1863         SSVAL(outbuf, ofs, num_bytes);
1864         ofs += sizeof(uint16_t);
1865
1866         /*
1867          * The bytes field
1868          */
1869
1870         memcpy(outbuf + ofs, bytes, num_bytes);
1871
1872         return true;
1873 }
1874
1875 /****************************************************************************
1876  Construct a chained reply and add it to the already made reply
1877 ****************************************************************************/
1878
1879 void chain_reply(struct smb_request *req)
1880 {
1881         size_t smblen = smb_len(req->inbuf);
1882         size_t already_used, length_needed;
1883         uint8_t chain_cmd;
1884         uint32_t chain_offset;  /* uint32_t to avoid overflow */
1885
1886         uint8_t wct;
1887         const uint16_t *vwv;
1888         uint16_t buflen;
1889         const uint8_t *buf;
1890
1891         if (IVAL(req->outbuf, smb_rcls) != 0) {
1892                 fixup_chain_error_packet(req);
1893         }
1894
1895         /*
1896          * Any of the AndX requests and replies have at least a wct of
1897          * 2. vwv[0] is the next command, vwv[1] is the offset from the
1898          * beginning of the SMB header to the next wct field.
1899          *
1900          * None of the AndX requests put anything valuable in vwv[0] and [1],
1901          * so we can overwrite it here to form the chain.
1902          */
1903
1904         if ((req->wct < 2) || (CVAL(req->outbuf, smb_wct) < 2)) {
1905                 if (req->chain_outbuf == NULL) {
1906                         req->chain_outbuf = talloc_realloc(
1907                                 req, req->outbuf, uint8_t,
1908                                 smb_len(req->outbuf) + 4);
1909                         if (req->chain_outbuf == NULL) {
1910                                 smb_panic("talloc failed");
1911                         }
1912                 }
1913                 req->outbuf = NULL;
1914                 goto error;
1915         }
1916
1917         /*
1918          * Here we assume that this is the end of the chain. For that we need
1919          * to set "next command" to 0xff and the offset to 0. If we later find
1920          * more commands in the chain, this will be overwritten again.
1921          */
1922
1923         SCVAL(req->outbuf, smb_vwv0, 0xff);
1924         SCVAL(req->outbuf, smb_vwv0+1, 0);
1925         SSVAL(req->outbuf, smb_vwv1, 0);
1926
1927         if (req->chain_outbuf == NULL) {
1928                 /*
1929                  * In req->chain_outbuf we collect all the replies. Start the
1930                  * chain by copying in the first reply.
1931                  *
1932                  * We do the realloc because later on we depend on
1933                  * talloc_get_size to determine the length of
1934                  * chain_outbuf. The reply_xxx routines might have
1935                  * over-allocated (reply_pipe_read_and_X used to be such an
1936                  * example).
1937                  */
1938                 req->chain_outbuf = talloc_realloc(
1939                         req, req->outbuf, uint8_t, smb_len(req->outbuf) + 4);
1940                 if (req->chain_outbuf == NULL) {
1941                         smb_panic("talloc failed");
1942                 }
1943                 req->outbuf = NULL;
1944         } else {
1945                 /*
1946                  * Update smb headers where subsequent chained commands
1947                  * may have updated them.
1948                  */
1949                 SSVAL(req->chain_outbuf, smb_tid, SVAL(req->outbuf, smb_tid));
1950                 SSVAL(req->chain_outbuf, smb_uid, SVAL(req->outbuf, smb_uid));
1951
1952                 if (!smb_splice_chain(&req->chain_outbuf, req->outbuf)) {
1953                         goto error;
1954                 }
1955                 TALLOC_FREE(req->outbuf);
1956         }
1957
1958         /*
1959          * We use the old request's vwv field to grab the next chained command
1960          * and offset into the chained fields.
1961          */
1962
1963         chain_cmd = CVAL(req->vwv+0, 0);
1964         chain_offset = SVAL(req->vwv+1, 0);
1965
1966         if (chain_cmd == 0xff) {
1967                 /*
1968                  * End of chain, no more requests from the client. So ship the
1969                  * replies.
1970                  */
1971                 smb_setlen((char *)(req->chain_outbuf),
1972                            talloc_get_size(req->chain_outbuf) - 4);
1973
1974                 if (!srv_send_smb(req->sconn, (char *)req->chain_outbuf,
1975                                   true, req->seqnum+1,
1976                                   IS_CONN_ENCRYPTED(req->conn)
1977                                   ||req->encrypted,
1978                                   &req->pcd)) {
1979                         exit_server_cleanly("chain_reply: srv_send_smb "
1980                                             "failed.");
1981                 }
1982                 TALLOC_FREE(req->chain_outbuf);
1983                 req->done = true;
1984                 return;
1985         }
1986
1987         /* add a new perfcounter for this element of chain */
1988         SMB_PERFCOUNT_ADD(&req->pcd);
1989         SMB_PERFCOUNT_SET_OP(&req->pcd, chain_cmd);
1990         SMB_PERFCOUNT_SET_MSGLEN_IN(&req->pcd, smblen);
1991
1992         /*
1993          * Check if the client tries to fool us. The chain offset
1994          * needs to point beyond the current request in the chain, it
1995          * needs to strictly grow. Otherwise we might be tricked into
1996          * an endless loop always processing the same request over and
1997          * over again. We used to assume that vwv and the byte buffer
1998          * array in a chain are always attached, but OS/2 the
1999          * Write&X/Read&X chain puts the Read&X vwv array right behind
2000          * the Write&X vwv chain. The Write&X bcc array is put behind
2001          * the Read&X vwv array. So now we check whether the chain
2002          * offset points strictly behind the previous vwv
2003          * array. req->buf points right after the vwv array of the
2004          * previous request. See
2005          * https://bugzilla.samba.org/show_bug.cgi?id=8360 for more
2006          * information.
2007          */
2008
2009         already_used = PTR_DIFF(req->buf, smb_base(req->inbuf));
2010         if (chain_offset <= already_used) {
2011                 goto error;
2012         }
2013
2014         /*
2015          * Next check: Make sure the chain offset does not point beyond the
2016          * overall smb request length.
2017          */
2018
2019         length_needed = chain_offset+1; /* wct */
2020         if (length_needed > smblen) {
2021                 goto error;
2022         }
2023
2024         /*
2025          * Now comes the pointer magic. Goal here is to set up req->vwv and
2026          * req->buf correctly again to be able to call the subsequent
2027          * switch_message(). The chain offset (the former vwv[1]) points at
2028          * the new wct field.
2029          */
2030
2031         wct = CVAL(smb_base(req->inbuf), chain_offset);
2032
2033         /*
2034          * Next consistency check: Make the new vwv array fits in the overall
2035          * smb request.
2036          */
2037
2038         length_needed += (wct+1)*sizeof(uint16_t); /* vwv+buflen */
2039         if (length_needed > smblen) {
2040                 goto error;
2041         }
2042         vwv = (const uint16_t *)(smb_base(req->inbuf) + chain_offset + 1);
2043
2044         /*
2045          * Now grab the new byte buffer....
2046          */
2047
2048         buflen = SVAL(vwv+wct, 0);
2049
2050         /*
2051          * .. and check that it fits.
2052          */
2053
2054         length_needed += buflen;
2055         if (length_needed > smblen) {
2056                 goto error;
2057         }
2058         buf = (const uint8_t *)(vwv+wct+1);
2059
2060         req->cmd = chain_cmd;
2061         req->wct = wct;
2062         req->vwv = discard_const_p(uint16_t, vwv);
2063         req->buflen = buflen;
2064         req->buf = buf;
2065
2066         switch_message(chain_cmd, req, smblen);
2067
2068         if (req->outbuf == NULL) {
2069                 /*
2070                  * This happens if the chained command has suspended itself or
2071                  * if it has called srv_send_smb() itself.
2072                  */
2073                 return;
2074         }
2075
2076         /*
2077          * We end up here if the chained command was not itself chained or
2078          * suspended, but for example a close() command. We now need to splice
2079          * the chained commands' outbuf into the already built up chain_outbuf
2080          * and ship the result.
2081          */
2082         goto done;
2083
2084  error:
2085         /*
2086          * We end up here if there's any error in the chain syntax. Report a
2087          * DOS error, just like Windows does.
2088          */
2089         reply_force_doserror(req, ERRSRV, ERRerror);
2090         fixup_chain_error_packet(req);
2091
2092  done:
2093         /*
2094          * This scary statement intends to set the
2095          * FLAGS2_32_BIT_ERROR_CODES flg2 field in req->chain_outbuf
2096          * to the value req->outbuf carries
2097          */
2098         SSVAL(req->chain_outbuf, smb_flg2,
2099               (SVAL(req->chain_outbuf, smb_flg2) & ~FLAGS2_32_BIT_ERROR_CODES)
2100               | (SVAL(req->outbuf, smb_flg2) & FLAGS2_32_BIT_ERROR_CODES));
2101
2102         /*
2103          * Transfer the error codes from the subrequest to the main one
2104          */
2105         SSVAL(req->chain_outbuf, smb_rcls, SVAL(req->outbuf, smb_rcls));
2106         SSVAL(req->chain_outbuf, smb_err, SVAL(req->outbuf, smb_err));
2107
2108         if (!smb_splice_chain(&req->chain_outbuf, req->outbuf)) {
2109                 exit_server_cleanly("chain_reply: smb_splice_chain failed\n");
2110         }
2111         TALLOC_FREE(req->outbuf);
2112
2113         smb_setlen((char *)(req->chain_outbuf),
2114                    talloc_get_size(req->chain_outbuf) - 4);
2115
2116         show_msg((char *)(req->chain_outbuf));
2117
2118         if (!srv_send_smb(req->sconn, (char *)req->chain_outbuf,
2119                           true, req->seqnum+1,
2120                           IS_CONN_ENCRYPTED(req->conn)||req->encrypted,
2121                           &req->pcd)) {
2122                 exit_server_cleanly("chain_reply: srv_send_smb failed.");
2123         }
2124         TALLOC_FREE(req->chain_outbuf);
2125         req->done = true;
2126 }
2127
2128 /****************************************************************************
2129  Check if services need reloading.
2130 ****************************************************************************/
2131
2132 static void check_reload(struct smbd_server_connection *sconn, time_t t)
2133 {
2134
2135         if (last_smb_conf_reload_time == 0) {
2136                 last_smb_conf_reload_time = t;
2137         }
2138
2139         if (t >= last_smb_conf_reload_time+SMBD_RELOAD_CHECK) {
2140                 reload_services(sconn, conn_snum_used, true);
2141                 last_smb_conf_reload_time = t;
2142         }
2143 }
2144
2145 static bool fd_is_readable(int fd)
2146 {
2147         int ret, revents;
2148
2149         ret = poll_one_fd(fd, POLLIN|POLLHUP, 0, &revents);
2150
2151         return ((ret > 0) && ((revents & (POLLIN|POLLHUP|POLLERR)) != 0));
2152
2153 }
2154
2155 static void smbd_server_connection_write_handler(
2156         struct smbd_server_connection *sconn)
2157 {
2158         /* TODO: make write nonblocking */
2159 }
2160
2161 static void smbd_server_connection_read_handler(
2162         struct smbd_server_connection *sconn, int fd)
2163 {
2164         uint8_t *inbuf = NULL;
2165         size_t inbuf_len = 0;
2166         size_t unread_bytes = 0;
2167         bool encrypted = false;
2168         TALLOC_CTX *mem_ctx = talloc_tos();
2169         NTSTATUS status;
2170         uint32_t seqnum;
2171
2172         bool from_client;
2173
2174         if (lp_async_smb_echo_handler()
2175             && fd_is_readable(sconn->smb1.echo_handler.trusted_fd)) {
2176                 /*
2177                  * This is the super-ugly hack to prefer the packets
2178                  * forwarded by the echo handler over the ones by the
2179                  * client directly
2180                  */
2181                 fd = sconn->smb1.echo_handler.trusted_fd;
2182         }
2183
2184         from_client = (sconn->sock == fd);
2185
2186         if (from_client) {
2187                 smbd_lock_socket(sconn);
2188
2189                 if (!fd_is_readable(fd)) {
2190                         DEBUG(10,("the echo listener was faster\n"));
2191                         smbd_unlock_socket(sconn);
2192                         return;
2193                 }
2194         }
2195
2196         /* TODO: make this completely nonblocking */
2197         status = receive_smb_talloc(mem_ctx, sconn, fd,
2198                                     (char **)(void *)&inbuf,
2199                                     0, /* timeout */
2200                                     &unread_bytes,
2201                                     &encrypted,
2202                                     &inbuf_len, &seqnum,
2203                                     false /* trusted channel */);
2204
2205         if (from_client) {
2206                 smbd_unlock_socket(sconn);
2207         }
2208
2209         if (NT_STATUS_EQUAL(status, NT_STATUS_RETRY)) {
2210                 goto process;
2211         }
2212         if (NT_STATUS_IS_ERR(status)) {
2213                 exit_server_cleanly("failed to receive smb request");
2214         }
2215         if (!NT_STATUS_IS_OK(status)) {
2216                 return;
2217         }
2218
2219 process:
2220         process_smb(sconn, inbuf, inbuf_len, unread_bytes,
2221                     seqnum, encrypted, NULL);
2222 }
2223
2224 static void smbd_server_connection_handler(struct event_context *ev,
2225                                            struct fd_event *fde,
2226                                            uint16_t flags,
2227                                            void *private_data)
2228 {
2229         struct smbd_server_connection *conn = talloc_get_type(private_data,
2230                                               struct smbd_server_connection);
2231
2232         if (flags & EVENT_FD_WRITE) {
2233                 smbd_server_connection_write_handler(conn);
2234                 return;
2235         }
2236         if (flags & EVENT_FD_READ) {
2237                 smbd_server_connection_read_handler(conn, conn->sock);
2238                 return;
2239         }
2240 }
2241
2242 static void smbd_server_echo_handler(struct event_context *ev,
2243                                      struct fd_event *fde,
2244                                      uint16_t flags,
2245                                      void *private_data)
2246 {
2247         struct smbd_server_connection *conn = talloc_get_type(private_data,
2248                                               struct smbd_server_connection);
2249
2250         if (flags & EVENT_FD_WRITE) {
2251                 smbd_server_connection_write_handler(conn);
2252                 return;
2253         }
2254         if (flags & EVENT_FD_READ) {
2255                 smbd_server_connection_read_handler(
2256                         conn, conn->smb1.echo_handler.trusted_fd);
2257                 return;
2258         }
2259 }
2260
2261 #ifdef CLUSTER_SUPPORT
2262 /****************************************************************************
2263 received when we should release a specific IP
2264 ****************************************************************************/
2265 static void release_ip(const char *ip, void *priv)
2266 {
2267         const char *addr = (const char *)priv;
2268         const char *p = addr;
2269
2270         if (strncmp("::ffff:", addr, 7) == 0) {
2271                 p = addr + 7;
2272         }
2273
2274         DEBUG(10, ("Got release IP message for %s, "
2275                    "our address is %s\n", ip, p));
2276
2277         if ((strcmp(p, ip) == 0) || ((p != addr) && strcmp(addr, ip) == 0)) {
2278                 /* we can't afford to do a clean exit - that involves
2279                    database writes, which would potentially mean we
2280                    are still running after the failover has finished -
2281                    we have to get rid of this process ID straight
2282                    away */
2283                 DEBUG(0,("Got release IP message for our IP %s - exiting immediately\n",
2284                         ip));
2285                 /* note we must exit with non-zero status so the unclean handler gets
2286                    called in the parent, so that the brl database is tickled */
2287                 _exit(1);
2288         }
2289 }
2290
2291 static int client_get_tcp_info(int sock, struct sockaddr_storage *server,
2292                                struct sockaddr_storage *client)
2293 {
2294         socklen_t length;
2295         length = sizeof(*server);
2296         if (getsockname(sock, (struct sockaddr *)server, &length) != 0) {
2297                 return -1;
2298         }
2299         length = sizeof(*client);
2300         if (getpeername(sock, (struct sockaddr *)client, &length) != 0) {
2301                 return -1;
2302         }
2303         return 0;
2304 }
2305 #endif
2306
2307 /*
2308  * Send keepalive packets to our client
2309  */
2310 static bool keepalive_fn(const struct timeval *now, void *private_data)
2311 {
2312         struct smbd_server_connection *sconn = talloc_get_type_abort(
2313                 private_data, struct smbd_server_connection);
2314         bool ret;
2315
2316         if (sconn->using_smb2) {
2317                 /* Don't do keepalives on an SMB2 connection. */
2318                 return false;
2319         }
2320
2321         smbd_lock_socket(sconn);
2322         ret = send_keepalive(sconn->sock);
2323         smbd_unlock_socket(sconn);
2324
2325         if (!ret) {
2326                 char addr[INET6_ADDRSTRLEN];
2327                 /*
2328                  * Try and give an error message saying what
2329                  * client failed.
2330                  */
2331                 DEBUG(0, ("send_keepalive failed for client %s. "
2332                           "Error %s - exiting\n",
2333                           get_peer_addr(sconn->sock, addr, sizeof(addr)),
2334                           strerror(errno)));
2335                 return False;
2336         }
2337         return True;
2338 }
2339
2340 /*
2341  * Do the recurring check if we're idle
2342  */
2343 static bool deadtime_fn(const struct timeval *now, void *private_data)
2344 {
2345         struct smbd_server_connection *sconn =
2346                 (struct smbd_server_connection *)private_data;
2347
2348         if ((conn_num_open(sconn) == 0)
2349             || (conn_idle_all(sconn, now->tv_sec))) {
2350                 DEBUG( 2, ( "Closing idle connection\n" ) );
2351                 messaging_send(sconn->msg_ctx,
2352                                messaging_server_id(sconn->msg_ctx),
2353                                MSG_SHUTDOWN, &data_blob_null);
2354                 return False;
2355         }
2356
2357         return True;
2358 }
2359
2360 /*
2361  * Do the recurring log file and smb.conf reload checks.
2362  */
2363
2364 static bool housekeeping_fn(const struct timeval *now, void *private_data)
2365 {
2366         struct smbd_server_connection *sconn = talloc_get_type_abort(
2367                 private_data, struct smbd_server_connection);
2368
2369         DEBUG(5, ("housekeeping\n"));
2370
2371         change_to_root_user();
2372
2373         /* update printer queue caches if necessary */
2374         update_monitored_printq_cache(sconn->msg_ctx);
2375
2376         /* check if we need to reload services */
2377         check_reload(sconn, time_mono(NULL));
2378
2379         /* Change machine password if neccessary. */
2380         attempt_machine_password_change();
2381
2382         /*
2383          * Force a log file check.
2384          */
2385         force_check_log_size();
2386         check_log_size();
2387         return true;
2388 }
2389
2390 /*
2391  * Read an smb packet in the echo handler child, giving the parent
2392  * smbd one second to react once the socket becomes readable.
2393  */
2394
2395 struct smbd_echo_read_state {
2396         struct tevent_context *ev;
2397         struct smbd_server_connection *sconn;
2398
2399         char *buf;
2400         size_t buflen;
2401         uint32_t seqnum;
2402 };
2403
2404 static void smbd_echo_read_readable(struct tevent_req *subreq);
2405 static void smbd_echo_read_waited(struct tevent_req *subreq);
2406
2407 static struct tevent_req *smbd_echo_read_send(
2408         TALLOC_CTX *mem_ctx, struct tevent_context *ev,
2409         struct smbd_server_connection *sconn)
2410 {
2411         struct tevent_req *req, *subreq;
2412         struct smbd_echo_read_state *state;
2413
2414         req = tevent_req_create(mem_ctx, &state,
2415                                 struct smbd_echo_read_state);
2416         if (req == NULL) {
2417                 return NULL;
2418         }
2419         state->ev = ev;
2420         state->sconn = sconn;
2421
2422         subreq = wait_for_read_send(state, ev, sconn->sock);
2423         if (tevent_req_nomem(subreq, req)) {
2424                 return tevent_req_post(req, ev);
2425         }
2426         tevent_req_set_callback(subreq, smbd_echo_read_readable, req);
2427         return req;
2428 }
2429
2430 static void smbd_echo_read_readable(struct tevent_req *subreq)
2431 {
2432         struct tevent_req *req = tevent_req_callback_data(
2433                 subreq, struct tevent_req);
2434         struct smbd_echo_read_state *state = tevent_req_data(
2435                 req, struct smbd_echo_read_state);
2436         bool ok;
2437         int err;
2438
2439         ok = wait_for_read_recv(subreq, &err);
2440         TALLOC_FREE(subreq);
2441         if (!ok) {
2442                 tevent_req_nterror(req, map_nt_error_from_unix(err));
2443                 return;
2444         }
2445
2446         /*
2447          * Give the parent smbd one second to step in
2448          */
2449
2450         subreq = tevent_wakeup_send(
2451                 state, state->ev, timeval_current_ofs(1, 0));
2452         if (tevent_req_nomem(subreq, req)) {
2453                 return;
2454         }
2455         tevent_req_set_callback(subreq, smbd_echo_read_waited, req);
2456 }
2457
2458 static void smbd_echo_read_waited(struct tevent_req *subreq)
2459 {
2460         struct tevent_req *req = tevent_req_callback_data(
2461                 subreq, struct tevent_req);
2462         struct smbd_echo_read_state *state = tevent_req_data(
2463                 req, struct smbd_echo_read_state);
2464         struct smbd_server_connection *sconn = state->sconn;
2465         bool ok;
2466         NTSTATUS status;
2467         size_t unread = 0;
2468         bool encrypted;
2469
2470         ok = tevent_wakeup_recv(subreq);
2471         TALLOC_FREE(subreq);
2472         if (!ok) {
2473                 tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
2474                 return;
2475         }
2476
2477         ok = smbd_lock_socket_internal(sconn);
2478         if (!ok) {
2479                 tevent_req_nterror(req, map_nt_error_from_unix(errno));
2480                 DEBUG(0, ("%s: failed to lock socket\n", __location__));
2481                 return;
2482         }
2483
2484         if (!fd_is_readable(sconn->sock)) {
2485                 DEBUG(10,("echo_handler[%d] the parent smbd was faster\n",
2486                           (int)sys_getpid()));
2487
2488                 ok = smbd_unlock_socket_internal(sconn);
2489                 if (!ok) {
2490                         tevent_req_nterror(req, map_nt_error_from_unix(errno));
2491                         DEBUG(1, ("%s: failed to unlock socket\n",
2492                                 __location__));
2493                         return;
2494                 }
2495
2496                 subreq = wait_for_read_send(state, state->ev, sconn->sock);
2497                 if (tevent_req_nomem(subreq, req)) {
2498                         return;
2499                 }
2500                 tevent_req_set_callback(subreq, smbd_echo_read_readable, req);
2501                 return;
2502         }
2503
2504         status = receive_smb_talloc(state, sconn, sconn->sock, &state->buf,
2505                                     0 /* timeout */,
2506                                     &unread,
2507                                     &encrypted,
2508                                     &state->buflen,
2509                                     &state->seqnum,
2510                                     false /* trusted_channel*/);
2511
2512         if (tevent_req_nterror(req, status)) {
2513                 tevent_req_nterror(req, status);
2514                 DEBUG(1, ("echo_handler[%d]: receive_smb_raw_talloc failed: %s\n",
2515                           (int)sys_getpid(), nt_errstr(status)));
2516                 return;
2517         }
2518
2519         ok = smbd_unlock_socket_internal(sconn);
2520         if (!ok) {
2521                 tevent_req_nterror(req, map_nt_error_from_unix(errno));
2522                 DEBUG(1, ("%s: failed to unlock socket\n", __location__));
2523                 return;
2524         }
2525         tevent_req_done(req);
2526 }
2527
2528 static NTSTATUS smbd_echo_read_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
2529                                     char **pbuf, size_t *pbuflen, uint32_t *pseqnum)
2530 {
2531         struct smbd_echo_read_state *state = tevent_req_data(
2532                 req, struct smbd_echo_read_state);
2533         NTSTATUS status;
2534
2535         if (tevent_req_is_nterror(req, &status)) {
2536                 return status;
2537         }
2538         *pbuf = talloc_move(mem_ctx, &state->buf);
2539         *pbuflen = state->buflen;
2540         *pseqnum = state->seqnum;
2541         return NT_STATUS_OK;
2542 }
2543
2544 struct smbd_echo_state {
2545         struct tevent_context *ev;
2546         struct iovec *pending;
2547         struct smbd_server_connection *sconn;
2548         int parent_pipe;
2549
2550         struct tevent_fd *parent_fde;
2551
2552         struct tevent_req *write_req;
2553 };
2554
2555 static void smbd_echo_writer_done(struct tevent_req *req);
2556
2557 static void smbd_echo_activate_writer(struct smbd_echo_state *state)
2558 {
2559         int num_pending;
2560
2561         if (state->write_req != NULL) {
2562                 return;
2563         }
2564
2565         num_pending = talloc_array_length(state->pending);
2566         if (num_pending == 0) {
2567                 return;
2568         }
2569
2570         state->write_req = writev_send(state, state->ev, NULL,
2571                                        state->parent_pipe, false,
2572                                        state->pending, num_pending);
2573         if (state->write_req == NULL) {
2574                 DEBUG(1, ("writev_send failed\n"));
2575                 exit(1);
2576         }
2577
2578         talloc_steal(state->write_req, state->pending);
2579         state->pending = NULL;
2580
2581         tevent_req_set_callback(state->write_req, smbd_echo_writer_done,
2582                                 state);
2583 }
2584
2585 static void smbd_echo_writer_done(struct tevent_req *req)
2586 {
2587         struct smbd_echo_state *state = tevent_req_callback_data(
2588                 req, struct smbd_echo_state);
2589         ssize_t written;
2590         int err;
2591
2592         written = writev_recv(req, &err);
2593         TALLOC_FREE(req);
2594         state->write_req = NULL;
2595         if (written == -1) {
2596                 DEBUG(1, ("writev to parent failed: %s\n", strerror(err)));
2597                 exit(1);
2598         }
2599         DEBUG(10,("echo_handler[%d]: forwarded pdu to main\n", (int)sys_getpid()));
2600         smbd_echo_activate_writer(state);
2601 }
2602
2603 static bool smbd_echo_reply(struct smbd_echo_state *state,
2604                             uint8_t *inbuf, size_t inbuf_len,
2605                             uint32_t seqnum)
2606 {
2607         struct smb_request req;
2608         uint16_t num_replies;
2609         char *outbuf;
2610         bool ok;
2611
2612         if ((inbuf_len == 4) && (CVAL(inbuf, 0) == NBSSkeepalive)) {
2613                 DEBUG(10, ("Got netbios keepalive\n"));
2614                 /*
2615                  * Just swallow it
2616                  */
2617                 return true;
2618         }
2619
2620         if (inbuf_len < smb_size) {
2621                 DEBUG(10, ("Got short packet: %d bytes\n", (int)inbuf_len));
2622                 return false;
2623         }
2624         if (!valid_smb_header(state->sconn, inbuf)) {
2625                 DEBUG(10, ("Got invalid SMB header\n"));
2626                 return false;
2627         }
2628
2629         if (!init_smb_request(&req, state->sconn, inbuf, 0, false,
2630                               seqnum)) {
2631                 return false;
2632         }
2633         req.inbuf = inbuf;
2634
2635         DEBUG(10, ("smbecho handler got cmd %d (%s)\n", (int)req.cmd,
2636                    smb_messages[req.cmd].name
2637                    ? smb_messages[req.cmd].name : "unknown"));
2638
2639         if (req.cmd != SMBecho) {
2640                 return false;
2641         }
2642         if (req.wct < 1) {
2643                 return false;
2644         }
2645
2646         num_replies = SVAL(req.vwv+0, 0);
2647         if (num_replies != 1) {
2648                 /* Not a Windows "Hey, you're still there?" request */
2649                 return false;
2650         }
2651
2652         if (!create_outbuf(talloc_tos(), &req, (const char *)req.inbuf, &outbuf,
2653                            1, req.buflen)) {
2654                 DEBUG(10, ("create_outbuf failed\n"));
2655                 return false;
2656         }
2657         req.outbuf = (uint8_t *)outbuf;
2658
2659         SSVAL(req.outbuf, smb_vwv0, num_replies);
2660
2661         if (req.buflen > 0) {
2662                 memcpy(smb_buf(req.outbuf), req.buf, req.buflen);
2663         }
2664
2665         ok = srv_send_smb(req.sconn,
2666                           (char *)outbuf,
2667                           true, seqnum+1,
2668                           false, &req.pcd);
2669         TALLOC_FREE(outbuf);
2670         if (!ok) {
2671                 exit(1);
2672         }
2673
2674         return true;
2675 }
2676
2677 static void smbd_echo_exit(struct tevent_context *ev,
2678                            struct tevent_fd *fde, uint16_t flags,
2679                            void *private_data)
2680 {
2681         DEBUG(2, ("smbd_echo_exit: lost connection to parent\n"));
2682         exit(0);
2683 }
2684
2685 static void smbd_echo_got_packet(struct tevent_req *req);
2686
2687 static void smbd_echo_loop(struct smbd_server_connection *sconn,
2688                            int parent_pipe)
2689 {
2690         struct smbd_echo_state *state;
2691         struct tevent_req *read_req;
2692
2693         state = talloc_zero(sconn, struct smbd_echo_state);
2694         if (state == NULL) {
2695                 DEBUG(1, ("talloc failed\n"));
2696                 return;
2697         }
2698         state->sconn = sconn;
2699         state->parent_pipe = parent_pipe;
2700         state->ev = s3_tevent_context_init(state);
2701         if (state->ev == NULL) {
2702                 DEBUG(1, ("tevent_context_init failed\n"));
2703                 TALLOC_FREE(state);
2704                 return;
2705         }
2706         state->parent_fde = tevent_add_fd(state->ev, state, parent_pipe,
2707                                         TEVENT_FD_READ, smbd_echo_exit,
2708                                         state);
2709         if (state->parent_fde == NULL) {
2710                 DEBUG(1, ("tevent_add_fd failed\n"));
2711                 TALLOC_FREE(state);
2712                 return;
2713         }
2714
2715         read_req = smbd_echo_read_send(state, state->ev, sconn);
2716         if (read_req == NULL) {
2717                 DEBUG(1, ("smbd_echo_read_send failed\n"));
2718                 TALLOC_FREE(state);
2719                 return;
2720         }
2721         tevent_req_set_callback(read_req, smbd_echo_got_packet, state);
2722
2723         while (true) {
2724                 if (tevent_loop_once(state->ev) == -1) {
2725                         DEBUG(1, ("tevent_loop_once failed: %s\n",
2726                                   strerror(errno)));
2727                         break;
2728                 }
2729         }
2730         TALLOC_FREE(state);
2731 }
2732
2733 static void smbd_echo_got_packet(struct tevent_req *req)
2734 {
2735         struct smbd_echo_state *state = tevent_req_callback_data(
2736                 req, struct smbd_echo_state);
2737         NTSTATUS status;
2738         char *buf = NULL;
2739         size_t buflen = 0;
2740         uint32_t seqnum = 0;
2741         bool reply;
2742
2743         status = smbd_echo_read_recv(req, state, &buf, &buflen, &seqnum);
2744         TALLOC_FREE(req);
2745         if (!NT_STATUS_IS_OK(status)) {
2746                 DEBUG(1, ("smbd_echo_read_recv returned %s\n",
2747                           nt_errstr(status)));
2748                 exit(1);
2749         }
2750
2751         reply = smbd_echo_reply(state, (uint8_t *)buf, buflen, seqnum);
2752         if (!reply) {
2753                 size_t num_pending;
2754                 struct iovec *tmp;
2755                 struct iovec *iov;
2756
2757                 num_pending = talloc_array_length(state->pending);
2758                 tmp = talloc_realloc(state, state->pending, struct iovec,
2759                                      num_pending+1);
2760                 if (tmp == NULL) {
2761                         DEBUG(1, ("talloc_realloc failed\n"));
2762                         exit(1);
2763                 }
2764                 state->pending = tmp;
2765
2766                 if (buflen >= smb_size) {
2767                         /*
2768                          * place the seqnum in the packet so that the main process
2769                          * can reply with signing
2770                          */
2771                         SIVAL(buf, smb_ss_field, seqnum);
2772                         SIVAL(buf, smb_ss_field+4, NT_STATUS_V(NT_STATUS_OK));
2773                 }
2774
2775                 iov = &state->pending[num_pending];
2776                 iov->iov_base = buf;
2777                 iov->iov_len = buflen;
2778
2779                 DEBUG(10,("echo_handler[%d]: forward to main\n",
2780                           (int)sys_getpid()));
2781                 smbd_echo_activate_writer(state);
2782         }
2783
2784         req = smbd_echo_read_send(state, state->ev, state->sconn);
2785         if (req == NULL) {
2786                 DEBUG(1, ("smbd_echo_read_send failed\n"));
2787                 exit(1);
2788         }
2789         tevent_req_set_callback(req, smbd_echo_got_packet, state);
2790 }
2791
2792
2793 /*
2794  * Handle SMBecho requests in a forked child process
2795  */
2796 bool fork_echo_handler(struct smbd_server_connection *sconn)
2797 {
2798         int listener_pipe[2];
2799         int res;
2800         pid_t child;
2801
2802         res = pipe(listener_pipe);
2803         if (res == -1) {
2804                 DEBUG(1, ("pipe() failed: %s\n", strerror(errno)));
2805                 return false;
2806         }
2807         sconn->smb1.echo_handler.socket_lock_fd = create_unlink_tmp(lp_lockdir());
2808         if (sconn->smb1.echo_handler.socket_lock_fd == -1) {
2809                 DEBUG(1, ("Could not create lock fd: %s\n", strerror(errno)));
2810                 goto fail;
2811         }
2812
2813         child = sys_fork();
2814         if (child == 0) {
2815                 NTSTATUS status;
2816
2817                 close(listener_pipe[0]);
2818                 set_blocking(listener_pipe[1], false);
2819
2820                 status = reinit_after_fork(sconn->msg_ctx,
2821                                            sconn->ev_ctx,
2822                                            false);
2823                 if (!NT_STATUS_IS_OK(status)) {
2824                         DEBUG(1, ("reinit_after_fork failed: %s\n",
2825                                   nt_errstr(status)));
2826                         exit(1);
2827                 }
2828                 smbd_echo_loop(sconn, listener_pipe[1]);
2829                 exit(0);
2830         }
2831         close(listener_pipe[1]);
2832         listener_pipe[1] = -1;
2833         sconn->smb1.echo_handler.trusted_fd = listener_pipe[0];
2834
2835         DEBUG(10,("fork_echo_handler: main[%d] echo_child[%d]\n", (int)sys_getpid(), child));
2836
2837         /*
2838          * Without smb signing this is the same as the normal smbd
2839          * listener. This needs to change once signing comes in.
2840          */
2841         sconn->smb1.echo_handler.trusted_fde = tevent_add_fd(sconn->ev_ctx,
2842                                         sconn,
2843                                         sconn->smb1.echo_handler.trusted_fd,
2844                                         TEVENT_FD_READ,
2845                                         smbd_server_echo_handler,
2846                                         sconn);
2847         if (sconn->smb1.echo_handler.trusted_fde == NULL) {
2848                 DEBUG(1, ("event_add_fd failed\n"));
2849                 goto fail;
2850         }
2851
2852         return true;
2853
2854 fail:
2855         if (listener_pipe[0] != -1) {
2856                 close(listener_pipe[0]);
2857         }
2858         if (listener_pipe[1] != -1) {
2859                 close(listener_pipe[1]);
2860         }
2861         sconn->smb1.echo_handler.trusted_fd = -1;
2862         if (sconn->smb1.echo_handler.socket_lock_fd != -1) {
2863                 close(sconn->smb1.echo_handler.socket_lock_fd);
2864         }
2865         sconn->smb1.echo_handler.trusted_fd = -1;
2866         sconn->smb1.echo_handler.socket_lock_fd = -1;
2867         return false;
2868 }
2869
2870 #if CLUSTER_SUPPORT
2871
2872 static NTSTATUS smbd_register_ips(struct smbd_server_connection *sconn,
2873                                   struct sockaddr_storage *srv,
2874                                   struct sockaddr_storage *clnt)
2875 {
2876         struct ctdbd_connection *cconn;
2877         char tmp_addr[INET6_ADDRSTRLEN];
2878         char *addr;
2879
2880         cconn = messaging_ctdbd_connection();
2881         if (cconn == NULL) {
2882                 return NT_STATUS_NO_MEMORY;
2883         }
2884
2885         client_socket_addr(sconn->sock, tmp_addr, sizeof(tmp_addr));
2886         addr = talloc_strdup(cconn, tmp_addr);
2887         if (addr == NULL) {
2888                 return NT_STATUS_NO_MEMORY;
2889         }
2890         return ctdbd_register_ips(cconn, srv, clnt, release_ip, addr);
2891 }
2892
2893 #endif
2894
2895 static bool uid_in_use(const struct user_struct *user, uid_t uid)
2896 {
2897         while (user) {
2898                 if (user->session_info &&
2899                     (user->session_info->unix_token->uid == uid)) {
2900                         return true;
2901                 }
2902                 user = user->next;
2903         }
2904         return false;
2905 }
2906
2907 static bool gid_in_use(const struct user_struct *user, gid_t gid)
2908 {
2909         while (user) {
2910                 if (user->session_info != NULL) {
2911                         int i;
2912                         struct security_unix_token *utok;
2913
2914                         utok = user->session_info->unix_token;
2915                         if (utok->gid == gid) {
2916                                 return true;
2917                         }
2918                         for(i=0; i<utok->ngroups; i++) {
2919                                 if (utok->groups[i] == gid) {
2920                                         return true;
2921                                 }
2922                         }
2923                 }
2924                 user = user->next;
2925         }
2926         return false;
2927 }
2928
2929 static bool sid_in_use(const struct user_struct *user,
2930                        const struct dom_sid *psid)
2931 {
2932         while (user) {
2933                 struct security_token *tok;
2934
2935                 if (user->session_info == NULL) {
2936                         continue;
2937                 }
2938                 tok = user->session_info->security_token;
2939                 if (tok == NULL) {
2940                         /*
2941                          * Not sure session_info->security_token can
2942                          * ever be NULL. This check might be not
2943                          * necessary.
2944                          */
2945                         continue;
2946                 }
2947                 if (security_token_has_sid(tok, psid)) {
2948                         return true;
2949                 }
2950                 user = user->next;
2951         }
2952         return false;
2953 }
2954
2955 static bool id_in_use(const struct user_struct *user,
2956                       const struct id_cache_ref *id)
2957 {
2958         switch(id->type) {
2959         case UID:
2960                 return uid_in_use(user, id->id.uid);
2961         case GID:
2962                 return gid_in_use(user, id->id.gid);
2963         case SID:
2964                 return sid_in_use(user, &id->id.sid);
2965         default:
2966                 break;
2967         }
2968         return false;
2969 }
2970
2971 static void smbd_id_cache_kill(struct messaging_context *msg_ctx,
2972                                void *private_data,
2973                                uint32_t msg_type,
2974                                struct server_id server_id,
2975                                DATA_BLOB* data)
2976 {
2977         const char *msg = (data && data->data)
2978                 ? (const char *)data->data : "<NULL>";
2979         struct user_struct *validated_users;
2980         struct id_cache_ref id;
2981         struct smbd_server_connection *sconn =
2982                 talloc_get_type_abort(private_data,
2983                 struct smbd_server_connection);
2984
2985         validated_users = sconn->smb1.sessions.validated_users;
2986
2987         if (!id_cache_ref_parse(msg, &id)) {
2988                 DEBUG(0, ("Invalid ?ID: %s\n", msg));
2989                 return;
2990         }
2991
2992         if (id_in_use(validated_users, &id)) {
2993                 exit_server_cleanly(msg);
2994         }
2995         id_cache_delete_from_cache(&id);
2996 }
2997
2998 /****************************************************************************
2999  Process commands from the client
3000 ****************************************************************************/
3001
3002 void smbd_process(struct tevent_context *ev_ctx,
3003                   struct smbd_server_connection *sconn)
3004 {
3005         TALLOC_CTX *frame = talloc_stackframe();
3006         struct sockaddr_storage ss;
3007         struct sockaddr *sa = NULL;
3008         socklen_t sa_socklen;
3009         struct tsocket_address *local_address = NULL;
3010         struct tsocket_address *remote_address = NULL;
3011         const char *locaddr = NULL;
3012         const char *remaddr = NULL;
3013         char *rhost;
3014         int ret;
3015
3016         if (lp_maxprotocol() >= PROTOCOL_SMB2_02) {
3017                 /*
3018                  * We're not making the decision here,
3019                  * we're just allowing the client
3020                  * to decide between SMB1 and SMB2
3021                  * with the first negprot
3022                  * packet.
3023                  */
3024                 sconn->using_smb2 = true;
3025         }
3026
3027         /* Ensure child is set to blocking mode */
3028         set_blocking(sconn->sock,True);
3029
3030         set_socket_options(sconn->sock, "SO_KEEPALIVE");
3031         set_socket_options(sconn->sock, lp_socket_options());
3032
3033         sa = (struct sockaddr *)(void *)&ss;
3034         sa_socklen = sizeof(ss);
3035         ret = getpeername(sconn->sock, sa, &sa_socklen);
3036         if (ret != 0) {
3037                 int level = (errno == ENOTCONN)?2:0;
3038                 DEBUG(level,("getpeername() failed - %s\n", strerror(errno)));
3039                 exit_server_cleanly("getpeername() failed.\n");
3040         }
3041         ret = tsocket_address_bsd_from_sockaddr(sconn,
3042                                                 sa, sa_socklen,
3043                                                 &remote_address);
3044         if (ret != 0) {
3045                 DEBUG(0,("%s: tsocket_address_bsd_from_sockaddr remote failed - %s\n",
3046                         __location__, strerror(errno)));
3047                 exit_server_cleanly("tsocket_address_bsd_from_sockaddr remote failed.\n");
3048         }
3049
3050         sa = (struct sockaddr *)(void *)&ss;
3051         sa_socklen = sizeof(ss);
3052         ret = getsockname(sconn->sock, sa, &sa_socklen);
3053         if (ret != 0) {
3054                 int level = (errno == ENOTCONN)?2:0;
3055                 DEBUG(level,("getsockname() failed - %s\n", strerror(errno)));
3056                 exit_server_cleanly("getsockname() failed.\n");
3057         }
3058         ret = tsocket_address_bsd_from_sockaddr(sconn,
3059                                                 sa, sa_socklen,
3060                                                 &local_address);
3061         if (ret != 0) {
3062                 DEBUG(0,("%s: tsocket_address_bsd_from_sockaddr remote failed - %s\n",
3063                         __location__, strerror(errno)));
3064                 exit_server_cleanly("tsocket_address_bsd_from_sockaddr remote failed.\n");
3065         }
3066
3067         sconn->local_address = local_address;
3068         sconn->remote_address = remote_address;
3069
3070         if (tsocket_address_is_inet(local_address, "ip")) {
3071                 locaddr = tsocket_address_inet_addr_string(
3072                                 sconn->local_address,
3073                                 talloc_tos());
3074                 if (locaddr == NULL) {
3075                         DEBUG(0,("%s: tsocket_address_inet_addr_string local failed - %s\n",
3076                                  __location__, strerror(errno)));
3077                         exit_server_cleanly("tsocket_address_inet_addr_string local failed.\n");
3078                 }
3079         } else {
3080                 locaddr = "0.0.0.0";
3081         }
3082
3083         if (tsocket_address_is_inet(remote_address, "ip")) {
3084                 remaddr = tsocket_address_inet_addr_string(
3085                                 sconn->remote_address,
3086                                 talloc_tos());
3087                 if (remaddr == NULL) {
3088                         DEBUG(0,("%s: tsocket_address_inet_addr_string remote failed - %s\n",
3089                                  __location__, strerror(errno)));
3090                         exit_server_cleanly("tsocket_address_inet_addr_string remote failed.\n");
3091                 }
3092         } else {
3093                 remaddr = "0.0.0.0";
3094         }
3095
3096         /* this is needed so that we get decent entries
3097            in smbstatus for port 445 connects */
3098         set_remote_machine_name(remaddr, false);
3099         reload_services(sconn, conn_snum_used, true);
3100
3101         /*
3102          * Before the first packet, check the global hosts allow/ hosts deny
3103          * parameters before doing any parsing of packets passed to us by the
3104          * client. This prevents attacks on our parsing code from hosts not in
3105          * the hosts allow list.
3106          */
3107
3108         ret = get_remote_hostname(remote_address,
3109                                   &rhost,
3110                                   talloc_tos());
3111         if (ret < 0) {
3112                 DEBUG(0,("%s: get_remote_hostname failed - %s\n",
3113                         __location__, strerror(errno)));
3114                 exit_server_cleanly("get_remote_hostname failed.\n");
3115         }
3116         if (strequal(rhost, "UNKNOWN")) {
3117                 rhost = talloc_strdup(talloc_tos(), remaddr);
3118         }
3119         sconn->remote_hostname = talloc_move(sconn, &rhost);
3120
3121         sub_set_socket_ids(remaddr,
3122                            sconn->remote_hostname,
3123                            locaddr);
3124
3125         if (!allow_access(lp_hostsdeny(-1), lp_hostsallow(-1),
3126                           sconn->remote_hostname,
3127                           remaddr)) {
3128                 /*
3129                  * send a negative session response "not listening on calling
3130                  * name"
3131                  */
3132                 unsigned char buf[5] = {0x83, 0, 0, 1, 0x81};
3133                 DEBUG( 1, ("Connection denied from %s to %s\n",
3134                            tsocket_address_string(remote_address, talloc_tos()),
3135                            tsocket_address_string(local_address, talloc_tos())));
3136                 (void)srv_send_smb(sconn,(char *)buf, false,
3137                                    0, false, NULL);
3138                 exit_server_cleanly("connection denied");
3139         }
3140
3141         DEBUG(10, ("Connection allowed from %s to %s\n",
3142                    tsocket_address_string(remote_address, talloc_tos()),
3143                    tsocket_address_string(local_address, talloc_tos())));
3144
3145         init_modules();
3146
3147         smb_perfcount_init();
3148
3149         if (!init_account_policy()) {
3150                 exit_server("Could not open account policy tdb.\n");
3151         }
3152
3153         if (*lp_rootdir()) {
3154                 if (chroot(lp_rootdir()) != 0) {
3155                         DEBUG(0,("Failed to change root to %s\n", lp_rootdir()));
3156                         exit_server("Failed to chroot()");
3157                 }
3158                 if (chdir("/") == -1) {
3159                         DEBUG(0,("Failed to chdir to / on chroot to %s\n", lp_rootdir()));
3160                         exit_server("Failed to chroot()");
3161                 }
3162                 DEBUG(0,("Changed root to %s\n", lp_rootdir()));
3163         }
3164
3165         if (!srv_init_signing(sconn)) {
3166                 exit_server("Failed to init smb_signing");
3167         }
3168
3169         /* Setup oplocks */
3170         if (!init_oplocks(sconn))
3171                 exit_server("Failed to init oplocks");
3172
3173         /* register our message handlers */
3174         messaging_register(sconn->msg_ctx, sconn,
3175                            MSG_SMB_FORCE_TDIS, msg_force_tdis);
3176         messaging_register(sconn->msg_ctx, sconn,
3177                            MSG_SMB_CLOSE_FILE, msg_close_file);
3178         messaging_register(sconn->msg_ctx, sconn,
3179                            MSG_SMB_FILE_RENAME, msg_file_was_renamed);
3180
3181         id_cache_register_msgs(sconn->msg_ctx);
3182         messaging_deregister(sconn->msg_ctx, ID_CACHE_KILL, NULL);
3183         messaging_register(sconn->msg_ctx, sconn,
3184                            ID_CACHE_KILL, smbd_id_cache_kill);
3185
3186         messaging_deregister(sconn->msg_ctx,
3187                              MSG_SMB_CONF_UPDATED, sconn->ev_ctx);
3188         messaging_register(sconn->msg_ctx, sconn,
3189                            MSG_SMB_CONF_UPDATED, smbd_conf_updated);
3190
3191         /*
3192          * Use the default MSG_DEBUG handler to avoid rebroadcasting
3193          * MSGs to all child processes
3194          */
3195         messaging_deregister(sconn->msg_ctx,
3196                              MSG_DEBUG, NULL);
3197         messaging_register(sconn->msg_ctx, NULL,
3198                            MSG_DEBUG, debug_message);
3199
3200         if ((lp_keepalive() != 0)
3201             && !(event_add_idle(ev_ctx, NULL,
3202                                 timeval_set(lp_keepalive(), 0),
3203                                 "keepalive", keepalive_fn,
3204                                 sconn))) {
3205                 DEBUG(0, ("Could not add keepalive event\n"));
3206                 exit(1);
3207         }
3208
3209         if (!(event_add_idle(ev_ctx, NULL,
3210                              timeval_set(IDLE_CLOSED_TIMEOUT, 0),
3211                              "deadtime", deadtime_fn, sconn))) {
3212                 DEBUG(0, ("Could not add deadtime event\n"));
3213                 exit(1);
3214         }
3215
3216         if (!(event_add_idle(ev_ctx, NULL,
3217                              timeval_set(SMBD_HOUSEKEEPING_INTERVAL, 0),
3218                              "housekeeping", housekeeping_fn, sconn))) {
3219                 DEBUG(0, ("Could not add housekeeping event\n"));
3220                 exit(1);
3221         }
3222
3223 #ifdef CLUSTER_SUPPORT
3224
3225         if (lp_clustering()) {
3226                 /*
3227                  * We need to tell ctdb about our client's TCP
3228                  * connection, so that for failover ctdbd can send
3229                  * tickle acks, triggering a reconnection by the
3230                  * client.
3231                  */
3232
3233                 struct sockaddr_storage srv, clnt;
3234
3235                 if (client_get_tcp_info(sconn->sock, &srv, &clnt) == 0) {
3236                         NTSTATUS status;
3237                         status = smbd_register_ips(sconn, &srv, &clnt);
3238                         if (!NT_STATUS_IS_OK(status)) {
3239                                 DEBUG(0, ("ctdbd_register_ips failed: %s\n",
3240                                           nt_errstr(status)));
3241                         }
3242                 } else
3243                 {
3244                         DEBUG(0,("Unable to get tcp info for "
3245                                  "CTDB_CONTROL_TCP_CLIENT: %s\n",
3246                                  strerror(errno)));
3247                 }
3248         }
3249
3250 #endif
3251
3252         sconn->nbt.got_session = false;
3253
3254         sconn->smb1.negprot.max_recv = MIN(lp_maxxmit(),BUFFER_SIZE);
3255
3256         sconn->smb1.sessions.done_sesssetup = false;
3257         sconn->smb1.sessions.max_send = BUFFER_SIZE;
3258         sconn->smb1.sessions.last_session_tag = UID_FIELD_INVALID;
3259         /* users from session setup */
3260         sconn->smb1.sessions.session_userlist = NULL;
3261         /* workgroup from session setup. */
3262         sconn->smb1.sessions.session_workgroup = NULL;
3263         /* this holds info on user ids that are already validated for this VC */
3264         sconn->smb1.sessions.validated_users = NULL;
3265         sconn->smb1.sessions.next_vuid = VUID_OFFSET;
3266         sconn->smb1.sessions.num_validated_vuids = 0;
3267
3268         conn_init(sconn);
3269         if (!init_dptrs(sconn)) {
3270                 exit_server("init_dptrs() failed");
3271         }
3272
3273         sconn->smb1.fde = event_add_fd(ev_ctx,
3274                                                   sconn,
3275                                                   sconn->sock,
3276                                                   EVENT_FD_READ,
3277                                                   smbd_server_connection_handler,
3278                                                   sconn);
3279         if (!sconn->smb1.fde) {
3280                 exit_server("failed to create smbd_server_connection fde");
3281         }
3282
3283         TALLOC_FREE(frame);
3284
3285         while (True) {
3286                 frame = talloc_stackframe_pool(8192);
3287
3288                 errno = 0;
3289                 if (tevent_loop_once(ev_ctx) == -1) {
3290                         if (errno != EINTR) {
3291                                 DEBUG(3, ("tevent_loop_once failed: %s,"
3292                                           " exiting\n", strerror(errno) ));
3293                                 break;
3294                         }
3295                 }
3296
3297                 TALLOC_FREE(frame);
3298         }
3299
3300         exit_server_cleanly(NULL);
3301 }
3302
3303 bool req_is_in_chain(struct smb_request *req)
3304 {
3305         if (req->vwv != (const uint16_t *)(req->inbuf+smb_vwv)) {
3306                 /*
3307                  * We're right now handling a subsequent request, so we must
3308                  * be in a chain
3309                  */
3310                 return true;
3311         }
3312
3313         if (!is_andx_req(req->cmd)) {
3314                 return false;
3315         }
3316
3317         if (req->wct < 2) {
3318                 /*
3319                  * Okay, an illegal request, but definitely not chained :-)
3320                  */
3321                 return false;
3322         }
3323
3324         return (CVAL(req->vwv+0, 0) != 0xFF);
3325 }