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         bool first_request;
1794
1795         old_size = talloc_get_size(*poutbuf);
1796
1797         /*
1798          * old_size == smb_wct means we're pushing the first request in for
1799          * libsmb/
1800          */
1801
1802         first_request = (old_size == smb_wct);
1803
1804         if (!first_request && ((old_size % 4) != 0)) {
1805                 /*
1806                  * Align the wct field of subsequent requests to a 4-byte
1807                  * boundary
1808                  */
1809                 chain_padding = 4 - (old_size % 4);
1810         }
1811
1812         /*
1813          * After the old request comes the new wct field (1 byte), the vwv's
1814          * and the num_bytes field.
1815          */
1816
1817         new_size = old_size + chain_padding + 1 + wct * sizeof(uint16_t) + 2;
1818         new_size += num_bytes;
1819
1820         if ((smb_command != SMBwriteX) && (new_size > 0xffff)) {
1821                 DEBUG(1, ("smb_splice_chain: %u bytes won't fit\n",
1822                           (unsigned)new_size));
1823                 return false;
1824         }
1825
1826         outbuf = talloc_realloc(NULL, *poutbuf, uint8_t, new_size);
1827         if (outbuf == NULL) {
1828                 DEBUG(0, ("talloc failed\n"));
1829                 return false;
1830         }
1831         *poutbuf = outbuf;
1832
1833         if (first_request) {
1834                 SCVAL(outbuf, smb_com, smb_command);
1835         } else {
1836                 size_t andx_cmd_ofs;
1837
1838                 if (!find_andx_cmd_ofs(outbuf, &andx_cmd_ofs)) {
1839                         DEBUG(1, ("invalid command chain\n"));
1840                         *poutbuf = talloc_realloc(
1841                                 NULL, *poutbuf, uint8_t, old_size);
1842                         return false;
1843                 }
1844
1845                 if (chain_padding != 0) {
1846                         memset(outbuf + old_size, 0, chain_padding);
1847                         old_size += chain_padding;
1848                 }
1849
1850                 SCVAL(outbuf, andx_cmd_ofs, smb_command);
1851                 SSVAL(outbuf, andx_cmd_ofs + 2, old_size - 4);
1852         }
1853
1854         ofs = old_size;
1855
1856         /*
1857          * Push the chained request:
1858          *
1859          * wct field
1860          */
1861
1862         SCVAL(outbuf, ofs, wct);
1863         ofs += 1;
1864
1865         /*
1866          * vwv array
1867          */
1868
1869         memcpy(outbuf + ofs, vwv, sizeof(uint16_t) * wct);
1870         ofs += sizeof(uint16_t) * wct;
1871
1872         /*
1873          * bcc (byte count)
1874          */
1875
1876         SSVAL(outbuf, ofs, num_bytes);
1877         ofs += sizeof(uint16_t);
1878
1879         /*
1880          * The bytes field
1881          */
1882
1883         memcpy(outbuf + ofs, bytes, num_bytes);
1884
1885         return true;
1886 }
1887
1888 /****************************************************************************
1889  Construct a chained reply and add it to the already made reply
1890 ****************************************************************************/
1891
1892 void chain_reply(struct smb_request *req)
1893 {
1894         size_t smblen = smb_len(req->inbuf);
1895         size_t already_used, length_needed;
1896         uint8_t chain_cmd;
1897         uint32_t chain_offset;  /* uint32_t to avoid overflow */
1898
1899         uint8_t wct;
1900         const uint16_t *vwv;
1901         uint16_t buflen;
1902         const uint8_t *buf;
1903
1904         if (IVAL(req->outbuf, smb_rcls) != 0) {
1905                 fixup_chain_error_packet(req);
1906         }
1907
1908         /*
1909          * Any of the AndX requests and replies have at least a wct of
1910          * 2. vwv[0] is the next command, vwv[1] is the offset from the
1911          * beginning of the SMB header to the next wct field.
1912          *
1913          * None of the AndX requests put anything valuable in vwv[0] and [1],
1914          * so we can overwrite it here to form the chain.
1915          */
1916
1917         if ((req->wct < 2) || (CVAL(req->outbuf, smb_wct) < 2)) {
1918                 if (req->chain_outbuf == NULL) {
1919                         req->chain_outbuf = talloc_realloc(
1920                                 req, req->outbuf, uint8_t,
1921                                 smb_len(req->outbuf) + 4);
1922                         if (req->chain_outbuf == NULL) {
1923                                 smb_panic("talloc failed");
1924                         }
1925                 }
1926                 req->outbuf = NULL;
1927                 goto error;
1928         }
1929
1930         /*
1931          * Here we assume that this is the end of the chain. For that we need
1932          * to set "next command" to 0xff and the offset to 0. If we later find
1933          * more commands in the chain, this will be overwritten again.
1934          */
1935
1936         SCVAL(req->outbuf, smb_vwv0, 0xff);
1937         SCVAL(req->outbuf, smb_vwv0+1, 0);
1938         SSVAL(req->outbuf, smb_vwv1, 0);
1939
1940         if (req->chain_outbuf == NULL) {
1941                 /*
1942                  * In req->chain_outbuf we collect all the replies. Start the
1943                  * chain by copying in the first reply.
1944                  *
1945                  * We do the realloc because later on we depend on
1946                  * talloc_get_size to determine the length of
1947                  * chain_outbuf. The reply_xxx routines might have
1948                  * over-allocated (reply_pipe_read_and_X used to be such an
1949                  * example).
1950                  */
1951                 req->chain_outbuf = talloc_realloc(
1952                         req, req->outbuf, uint8_t, smb_len(req->outbuf) + 4);
1953                 if (req->chain_outbuf == NULL) {
1954                         smb_panic("talloc failed");
1955                 }
1956                 req->outbuf = NULL;
1957         } else {
1958                 /*
1959                  * Update smb headers where subsequent chained commands
1960                  * may have updated them.
1961                  */
1962                 SSVAL(req->chain_outbuf, smb_tid, SVAL(req->outbuf, smb_tid));
1963                 SSVAL(req->chain_outbuf, smb_uid, SVAL(req->outbuf, smb_uid));
1964
1965                 if (!smb_splice_chain(&req->chain_outbuf, req->outbuf)) {
1966                         goto error;
1967                 }
1968                 TALLOC_FREE(req->outbuf);
1969         }
1970
1971         /*
1972          * We use the old request's vwv field to grab the next chained command
1973          * and offset into the chained fields.
1974          */
1975
1976         chain_cmd = CVAL(req->vwv+0, 0);
1977         chain_offset = SVAL(req->vwv+1, 0);
1978
1979         if (chain_cmd == 0xff) {
1980                 /*
1981                  * End of chain, no more requests from the client. So ship the
1982                  * replies.
1983                  */
1984                 smb_setlen((char *)(req->chain_outbuf),
1985                            talloc_get_size(req->chain_outbuf) - 4);
1986
1987                 if (!srv_send_smb(req->sconn, (char *)req->chain_outbuf,
1988                                   true, req->seqnum+1,
1989                                   IS_CONN_ENCRYPTED(req->conn)
1990                                   ||req->encrypted,
1991                                   &req->pcd)) {
1992                         exit_server_cleanly("chain_reply: srv_send_smb "
1993                                             "failed.");
1994                 }
1995                 TALLOC_FREE(req->chain_outbuf);
1996                 req->done = true;
1997                 return;
1998         }
1999
2000         /* add a new perfcounter for this element of chain */
2001         SMB_PERFCOUNT_ADD(&req->pcd);
2002         SMB_PERFCOUNT_SET_OP(&req->pcd, chain_cmd);
2003         SMB_PERFCOUNT_SET_MSGLEN_IN(&req->pcd, smblen);
2004
2005         /*
2006          * Check if the client tries to fool us. The chain offset
2007          * needs to point beyond the current request in the chain, it
2008          * needs to strictly grow. Otherwise we might be tricked into
2009          * an endless loop always processing the same request over and
2010          * over again. We used to assume that vwv and the byte buffer
2011          * array in a chain are always attached, but OS/2 the
2012          * Write&X/Read&X chain puts the Read&X vwv array right behind
2013          * the Write&X vwv chain. The Write&X bcc array is put behind
2014          * the Read&X vwv array. So now we check whether the chain
2015          * offset points strictly behind the previous vwv
2016          * array. req->buf points right after the vwv array of the
2017          * previous request. See
2018          * https://bugzilla.samba.org/show_bug.cgi?id=8360 for more
2019          * information.
2020          */
2021
2022         already_used = PTR_DIFF(req->buf, smb_base(req->inbuf));
2023         if (chain_offset <= already_used) {
2024                 goto error;
2025         }
2026
2027         /*
2028          * Next check: Make sure the chain offset does not point beyond the
2029          * overall smb request length.
2030          */
2031
2032         length_needed = chain_offset+1; /* wct */
2033         if (length_needed > smblen) {
2034                 goto error;
2035         }
2036
2037         /*
2038          * Now comes the pointer magic. Goal here is to set up req->vwv and
2039          * req->buf correctly again to be able to call the subsequent
2040          * switch_message(). The chain offset (the former vwv[1]) points at
2041          * the new wct field.
2042          */
2043
2044         wct = CVAL(smb_base(req->inbuf), chain_offset);
2045
2046         /*
2047          * Next consistency check: Make the new vwv array fits in the overall
2048          * smb request.
2049          */
2050
2051         length_needed += (wct+1)*sizeof(uint16_t); /* vwv+buflen */
2052         if (length_needed > smblen) {
2053                 goto error;
2054         }
2055         vwv = (const uint16_t *)(smb_base(req->inbuf) + chain_offset + 1);
2056
2057         /*
2058          * Now grab the new byte buffer....
2059          */
2060
2061         buflen = SVAL(vwv+wct, 0);
2062
2063         /*
2064          * .. and check that it fits.
2065          */
2066
2067         length_needed += buflen;
2068         if (length_needed > smblen) {
2069                 goto error;
2070         }
2071         buf = (const uint8_t *)(vwv+wct+1);
2072
2073         req->cmd = chain_cmd;
2074         req->wct = wct;
2075         req->vwv = discard_const_p(uint16_t, vwv);
2076         req->buflen = buflen;
2077         req->buf = buf;
2078
2079         switch_message(chain_cmd, req, smblen);
2080
2081         if (req->outbuf == NULL) {
2082                 /*
2083                  * This happens if the chained command has suspended itself or
2084                  * if it has called srv_send_smb() itself.
2085                  */
2086                 return;
2087         }
2088
2089         /*
2090          * We end up here if the chained command was not itself chained or
2091          * suspended, but for example a close() command. We now need to splice
2092          * the chained commands' outbuf into the already built up chain_outbuf
2093          * and ship the result.
2094          */
2095         goto done;
2096
2097  error:
2098         /*
2099          * We end up here if there's any error in the chain syntax. Report a
2100          * DOS error, just like Windows does.
2101          */
2102         reply_force_doserror(req, ERRSRV, ERRerror);
2103         fixup_chain_error_packet(req);
2104
2105  done:
2106         /*
2107          * This scary statement intends to set the
2108          * FLAGS2_32_BIT_ERROR_CODES flg2 field in req->chain_outbuf
2109          * to the value req->outbuf carries
2110          */
2111         SSVAL(req->chain_outbuf, smb_flg2,
2112               (SVAL(req->chain_outbuf, smb_flg2) & ~FLAGS2_32_BIT_ERROR_CODES)
2113               | (SVAL(req->outbuf, smb_flg2) & FLAGS2_32_BIT_ERROR_CODES));
2114
2115         /*
2116          * Transfer the error codes from the subrequest to the main one
2117          */
2118         SSVAL(req->chain_outbuf, smb_rcls, SVAL(req->outbuf, smb_rcls));
2119         SSVAL(req->chain_outbuf, smb_err, SVAL(req->outbuf, smb_err));
2120
2121         if (!smb_splice_chain(&req->chain_outbuf, req->outbuf)) {
2122                 exit_server_cleanly("chain_reply: smb_splice_chain failed\n");
2123         }
2124         TALLOC_FREE(req->outbuf);
2125
2126         smb_setlen((char *)(req->chain_outbuf),
2127                    talloc_get_size(req->chain_outbuf) - 4);
2128
2129         show_msg((char *)(req->chain_outbuf));
2130
2131         if (!srv_send_smb(req->sconn, (char *)req->chain_outbuf,
2132                           true, req->seqnum+1,
2133                           IS_CONN_ENCRYPTED(req->conn)||req->encrypted,
2134                           &req->pcd)) {
2135                 exit_server_cleanly("chain_reply: srv_send_smb failed.");
2136         }
2137         TALLOC_FREE(req->chain_outbuf);
2138         req->done = true;
2139 }
2140
2141 /****************************************************************************
2142  Check if services need reloading.
2143 ****************************************************************************/
2144
2145 static void check_reload(struct smbd_server_connection *sconn, time_t t)
2146 {
2147
2148         if (last_smb_conf_reload_time == 0) {
2149                 last_smb_conf_reload_time = t;
2150         }
2151
2152         if (t >= last_smb_conf_reload_time+SMBD_RELOAD_CHECK) {
2153                 reload_services(sconn, conn_snum_used, true);
2154                 last_smb_conf_reload_time = t;
2155         }
2156 }
2157
2158 static bool fd_is_readable(int fd)
2159 {
2160         int ret, revents;
2161
2162         ret = poll_one_fd(fd, POLLIN|POLLHUP, 0, &revents);
2163
2164         return ((ret > 0) && ((revents & (POLLIN|POLLHUP|POLLERR)) != 0));
2165
2166 }
2167
2168 static void smbd_server_connection_write_handler(
2169         struct smbd_server_connection *sconn)
2170 {
2171         /* TODO: make write nonblocking */
2172 }
2173
2174 static void smbd_server_connection_read_handler(
2175         struct smbd_server_connection *sconn, int fd)
2176 {
2177         uint8_t *inbuf = NULL;
2178         size_t inbuf_len = 0;
2179         size_t unread_bytes = 0;
2180         bool encrypted = false;
2181         TALLOC_CTX *mem_ctx = talloc_tos();
2182         NTSTATUS status;
2183         uint32_t seqnum;
2184
2185         bool from_client;
2186
2187         if (lp_async_smb_echo_handler()
2188             && fd_is_readable(sconn->smb1.echo_handler.trusted_fd)) {
2189                 /*
2190                  * This is the super-ugly hack to prefer the packets
2191                  * forwarded by the echo handler over the ones by the
2192                  * client directly
2193                  */
2194                 fd = sconn->smb1.echo_handler.trusted_fd;
2195         }
2196
2197         from_client = (sconn->sock == fd);
2198
2199         if (from_client) {
2200                 smbd_lock_socket(sconn);
2201
2202                 if (!fd_is_readable(fd)) {
2203                         DEBUG(10,("the echo listener was faster\n"));
2204                         smbd_unlock_socket(sconn);
2205                         return;
2206                 }
2207         }
2208
2209         /* TODO: make this completely nonblocking */
2210         status = receive_smb_talloc(mem_ctx, sconn, fd,
2211                                     (char **)(void *)&inbuf,
2212                                     0, /* timeout */
2213                                     &unread_bytes,
2214                                     &encrypted,
2215                                     &inbuf_len, &seqnum,
2216                                     false /* trusted channel */);
2217
2218         if (from_client) {
2219                 smbd_unlock_socket(sconn);
2220         }
2221
2222         if (NT_STATUS_EQUAL(status, NT_STATUS_RETRY)) {
2223                 goto process;
2224         }
2225         if (NT_STATUS_IS_ERR(status)) {
2226                 exit_server_cleanly("failed to receive smb request");
2227         }
2228         if (!NT_STATUS_IS_OK(status)) {
2229                 return;
2230         }
2231
2232 process:
2233         process_smb(sconn, inbuf, inbuf_len, unread_bytes,
2234                     seqnum, encrypted, NULL);
2235 }
2236
2237 static void smbd_server_connection_handler(struct event_context *ev,
2238                                            struct fd_event *fde,
2239                                            uint16_t flags,
2240                                            void *private_data)
2241 {
2242         struct smbd_server_connection *conn = talloc_get_type(private_data,
2243                                               struct smbd_server_connection);
2244
2245         if (flags & EVENT_FD_WRITE) {
2246                 smbd_server_connection_write_handler(conn);
2247                 return;
2248         }
2249         if (flags & EVENT_FD_READ) {
2250                 smbd_server_connection_read_handler(conn, conn->sock);
2251                 return;
2252         }
2253 }
2254
2255 static void smbd_server_echo_handler(struct event_context *ev,
2256                                      struct fd_event *fde,
2257                                      uint16_t flags,
2258                                      void *private_data)
2259 {
2260         struct smbd_server_connection *conn = talloc_get_type(private_data,
2261                                               struct smbd_server_connection);
2262
2263         if (flags & EVENT_FD_WRITE) {
2264                 smbd_server_connection_write_handler(conn);
2265                 return;
2266         }
2267         if (flags & EVENT_FD_READ) {
2268                 smbd_server_connection_read_handler(
2269                         conn, conn->smb1.echo_handler.trusted_fd);
2270                 return;
2271         }
2272 }
2273
2274 #ifdef CLUSTER_SUPPORT
2275 /****************************************************************************
2276 received when we should release a specific IP
2277 ****************************************************************************/
2278 static void release_ip(const char *ip, void *priv)
2279 {
2280         const char *addr = (const char *)priv;
2281         const char *p = addr;
2282
2283         if (strncmp("::ffff:", addr, 7) == 0) {
2284                 p = addr + 7;
2285         }
2286
2287         DEBUG(10, ("Got release IP message for %s, "
2288                    "our address is %s\n", ip, p));
2289
2290         if ((strcmp(p, ip) == 0) || ((p != addr) && strcmp(addr, ip) == 0)) {
2291                 /* we can't afford to do a clean exit - that involves
2292                    database writes, which would potentially mean we
2293                    are still running after the failover has finished -
2294                    we have to get rid of this process ID straight
2295                    away */
2296                 DEBUG(0,("Got release IP message for our IP %s - exiting immediately\n",
2297                         ip));
2298                 /* note we must exit with non-zero status so the unclean handler gets
2299                    called in the parent, so that the brl database is tickled */
2300                 _exit(1);
2301         }
2302 }
2303
2304 static int client_get_tcp_info(int sock, struct sockaddr_storage *server,
2305                                struct sockaddr_storage *client)
2306 {
2307         socklen_t length;
2308         length = sizeof(*server);
2309         if (getsockname(sock, (struct sockaddr *)server, &length) != 0) {
2310                 return -1;
2311         }
2312         length = sizeof(*client);
2313         if (getpeername(sock, (struct sockaddr *)client, &length) != 0) {
2314                 return -1;
2315         }
2316         return 0;
2317 }
2318 #endif
2319
2320 /*
2321  * Send keepalive packets to our client
2322  */
2323 static bool keepalive_fn(const struct timeval *now, void *private_data)
2324 {
2325         struct smbd_server_connection *sconn = talloc_get_type_abort(
2326                 private_data, struct smbd_server_connection);
2327         bool ret;
2328
2329         if (sconn->using_smb2) {
2330                 /* Don't do keepalives on an SMB2 connection. */
2331                 return false;
2332         }
2333
2334         smbd_lock_socket(sconn);
2335         ret = send_keepalive(sconn->sock);
2336         smbd_unlock_socket(sconn);
2337
2338         if (!ret) {
2339                 char addr[INET6_ADDRSTRLEN];
2340                 /*
2341                  * Try and give an error message saying what
2342                  * client failed.
2343                  */
2344                 DEBUG(0, ("send_keepalive failed for client %s. "
2345                           "Error %s - exiting\n",
2346                           get_peer_addr(sconn->sock, addr, sizeof(addr)),
2347                           strerror(errno)));
2348                 return False;
2349         }
2350         return True;
2351 }
2352
2353 /*
2354  * Do the recurring check if we're idle
2355  */
2356 static bool deadtime_fn(const struct timeval *now, void *private_data)
2357 {
2358         struct smbd_server_connection *sconn =
2359                 (struct smbd_server_connection *)private_data;
2360
2361         if ((conn_num_open(sconn) == 0)
2362             || (conn_idle_all(sconn, now->tv_sec))) {
2363                 DEBUG( 2, ( "Closing idle connection\n" ) );
2364                 messaging_send(sconn->msg_ctx,
2365                                messaging_server_id(sconn->msg_ctx),
2366                                MSG_SHUTDOWN, &data_blob_null);
2367                 return False;
2368         }
2369
2370         return True;
2371 }
2372
2373 /*
2374  * Do the recurring log file and smb.conf reload checks.
2375  */
2376
2377 static bool housekeeping_fn(const struct timeval *now, void *private_data)
2378 {
2379         struct smbd_server_connection *sconn = talloc_get_type_abort(
2380                 private_data, struct smbd_server_connection);
2381
2382         DEBUG(5, ("housekeeping\n"));
2383
2384         change_to_root_user();
2385
2386         /* update printer queue caches if necessary */
2387         update_monitored_printq_cache(sconn->msg_ctx);
2388
2389         /* check if we need to reload services */
2390         check_reload(sconn, time_mono(NULL));
2391
2392         /* Change machine password if neccessary. */
2393         attempt_machine_password_change();
2394
2395         /*
2396          * Force a log file check.
2397          */
2398         force_check_log_size();
2399         check_log_size();
2400         return true;
2401 }
2402
2403 /*
2404  * Read an smb packet in the echo handler child, giving the parent
2405  * smbd one second to react once the socket becomes readable.
2406  */
2407
2408 struct smbd_echo_read_state {
2409         struct tevent_context *ev;
2410         struct smbd_server_connection *sconn;
2411
2412         char *buf;
2413         size_t buflen;
2414         uint32_t seqnum;
2415 };
2416
2417 static void smbd_echo_read_readable(struct tevent_req *subreq);
2418 static void smbd_echo_read_waited(struct tevent_req *subreq);
2419
2420 static struct tevent_req *smbd_echo_read_send(
2421         TALLOC_CTX *mem_ctx, struct tevent_context *ev,
2422         struct smbd_server_connection *sconn)
2423 {
2424         struct tevent_req *req, *subreq;
2425         struct smbd_echo_read_state *state;
2426
2427         req = tevent_req_create(mem_ctx, &state,
2428                                 struct smbd_echo_read_state);
2429         if (req == NULL) {
2430                 return NULL;
2431         }
2432         state->ev = ev;
2433         state->sconn = sconn;
2434
2435         subreq = wait_for_read_send(state, ev, sconn->sock);
2436         if (tevent_req_nomem(subreq, req)) {
2437                 return tevent_req_post(req, ev);
2438         }
2439         tevent_req_set_callback(subreq, smbd_echo_read_readable, req);
2440         return req;
2441 }
2442
2443 static void smbd_echo_read_readable(struct tevent_req *subreq)
2444 {
2445         struct tevent_req *req = tevent_req_callback_data(
2446                 subreq, struct tevent_req);
2447         struct smbd_echo_read_state *state = tevent_req_data(
2448                 req, struct smbd_echo_read_state);
2449         bool ok;
2450         int err;
2451
2452         ok = wait_for_read_recv(subreq, &err);
2453         TALLOC_FREE(subreq);
2454         if (!ok) {
2455                 tevent_req_nterror(req, map_nt_error_from_unix(err));
2456                 return;
2457         }
2458
2459         /*
2460          * Give the parent smbd one second to step in
2461          */
2462
2463         subreq = tevent_wakeup_send(
2464                 state, state->ev, timeval_current_ofs(1, 0));
2465         if (tevent_req_nomem(subreq, req)) {
2466                 return;
2467         }
2468         tevent_req_set_callback(subreq, smbd_echo_read_waited, req);
2469 }
2470
2471 static void smbd_echo_read_waited(struct tevent_req *subreq)
2472 {
2473         struct tevent_req *req = tevent_req_callback_data(
2474                 subreq, struct tevent_req);
2475         struct smbd_echo_read_state *state = tevent_req_data(
2476                 req, struct smbd_echo_read_state);
2477         struct smbd_server_connection *sconn = state->sconn;
2478         bool ok;
2479         NTSTATUS status;
2480         size_t unread = 0;
2481         bool encrypted;
2482
2483         ok = tevent_wakeup_recv(subreq);
2484         TALLOC_FREE(subreq);
2485         if (!ok) {
2486                 tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
2487                 return;
2488         }
2489
2490         ok = smbd_lock_socket_internal(sconn);
2491         if (!ok) {
2492                 tevent_req_nterror(req, map_nt_error_from_unix(errno));
2493                 DEBUG(0, ("%s: failed to lock socket\n", __location__));
2494                 return;
2495         }
2496
2497         if (!fd_is_readable(sconn->sock)) {
2498                 DEBUG(10,("echo_handler[%d] the parent smbd was faster\n",
2499                           (int)sys_getpid()));
2500
2501                 ok = smbd_unlock_socket_internal(sconn);
2502                 if (!ok) {
2503                         tevent_req_nterror(req, map_nt_error_from_unix(errno));
2504                         DEBUG(1, ("%s: failed to unlock socket\n",
2505                                 __location__));
2506                         return;
2507                 }
2508
2509                 subreq = wait_for_read_send(state, state->ev, sconn->sock);
2510                 if (tevent_req_nomem(subreq, req)) {
2511                         return;
2512                 }
2513                 tevent_req_set_callback(subreq, smbd_echo_read_readable, req);
2514                 return;
2515         }
2516
2517         status = receive_smb_talloc(state, sconn, sconn->sock, &state->buf,
2518                                     0 /* timeout */,
2519                                     &unread,
2520                                     &encrypted,
2521                                     &state->buflen,
2522                                     &state->seqnum,
2523                                     false /* trusted_channel*/);
2524
2525         if (tevent_req_nterror(req, status)) {
2526                 tevent_req_nterror(req, status);
2527                 DEBUG(1, ("echo_handler[%d]: receive_smb_raw_talloc failed: %s\n",
2528                           (int)sys_getpid(), nt_errstr(status)));
2529                 return;
2530         }
2531
2532         ok = smbd_unlock_socket_internal(sconn);
2533         if (!ok) {
2534                 tevent_req_nterror(req, map_nt_error_from_unix(errno));
2535                 DEBUG(1, ("%s: failed to unlock socket\n", __location__));
2536                 return;
2537         }
2538         tevent_req_done(req);
2539 }
2540
2541 static NTSTATUS smbd_echo_read_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
2542                                     char **pbuf, size_t *pbuflen, uint32_t *pseqnum)
2543 {
2544         struct smbd_echo_read_state *state = tevent_req_data(
2545                 req, struct smbd_echo_read_state);
2546         NTSTATUS status;
2547
2548         if (tevent_req_is_nterror(req, &status)) {
2549                 return status;
2550         }
2551         *pbuf = talloc_move(mem_ctx, &state->buf);
2552         *pbuflen = state->buflen;
2553         *pseqnum = state->seqnum;
2554         return NT_STATUS_OK;
2555 }
2556
2557 struct smbd_echo_state {
2558         struct tevent_context *ev;
2559         struct iovec *pending;
2560         struct smbd_server_connection *sconn;
2561         int parent_pipe;
2562
2563         struct tevent_fd *parent_fde;
2564
2565         struct tevent_req *write_req;
2566 };
2567
2568 static void smbd_echo_writer_done(struct tevent_req *req);
2569
2570 static void smbd_echo_activate_writer(struct smbd_echo_state *state)
2571 {
2572         int num_pending;
2573
2574         if (state->write_req != NULL) {
2575                 return;
2576         }
2577
2578         num_pending = talloc_array_length(state->pending);
2579         if (num_pending == 0) {
2580                 return;
2581         }
2582
2583         state->write_req = writev_send(state, state->ev, NULL,
2584                                        state->parent_pipe, false,
2585                                        state->pending, num_pending);
2586         if (state->write_req == NULL) {
2587                 DEBUG(1, ("writev_send failed\n"));
2588                 exit(1);
2589         }
2590
2591         talloc_steal(state->write_req, state->pending);
2592         state->pending = NULL;
2593
2594         tevent_req_set_callback(state->write_req, smbd_echo_writer_done,
2595                                 state);
2596 }
2597
2598 static void smbd_echo_writer_done(struct tevent_req *req)
2599 {
2600         struct smbd_echo_state *state = tevent_req_callback_data(
2601                 req, struct smbd_echo_state);
2602         ssize_t written;
2603         int err;
2604
2605         written = writev_recv(req, &err);
2606         TALLOC_FREE(req);
2607         state->write_req = NULL;
2608         if (written == -1) {
2609                 DEBUG(1, ("writev to parent failed: %s\n", strerror(err)));
2610                 exit(1);
2611         }
2612         DEBUG(10,("echo_handler[%d]: forwarded pdu to main\n", (int)sys_getpid()));
2613         smbd_echo_activate_writer(state);
2614 }
2615
2616 static bool smbd_echo_reply(struct smbd_echo_state *state,
2617                             uint8_t *inbuf, size_t inbuf_len,
2618                             uint32_t seqnum)
2619 {
2620         struct smb_request req;
2621         uint16_t num_replies;
2622         char *outbuf;
2623         bool ok;
2624
2625         if ((inbuf_len == 4) && (CVAL(inbuf, 0) == NBSSkeepalive)) {
2626                 DEBUG(10, ("Got netbios keepalive\n"));
2627                 /*
2628                  * Just swallow it
2629                  */
2630                 return true;
2631         }
2632
2633         if (inbuf_len < smb_size) {
2634                 DEBUG(10, ("Got short packet: %d bytes\n", (int)inbuf_len));
2635                 return false;
2636         }
2637         if (!valid_smb_header(state->sconn, inbuf)) {
2638                 DEBUG(10, ("Got invalid SMB header\n"));
2639                 return false;
2640         }
2641
2642         if (!init_smb_request(&req, state->sconn, inbuf, 0, false,
2643                               seqnum)) {
2644                 return false;
2645         }
2646         req.inbuf = inbuf;
2647
2648         DEBUG(10, ("smbecho handler got cmd %d (%s)\n", (int)req.cmd,
2649                    smb_messages[req.cmd].name
2650                    ? smb_messages[req.cmd].name : "unknown"));
2651
2652         if (req.cmd != SMBecho) {
2653                 return false;
2654         }
2655         if (req.wct < 1) {
2656                 return false;
2657         }
2658
2659         num_replies = SVAL(req.vwv+0, 0);
2660         if (num_replies != 1) {
2661                 /* Not a Windows "Hey, you're still there?" request */
2662                 return false;
2663         }
2664
2665         if (!create_outbuf(talloc_tos(), &req, (const char *)req.inbuf, &outbuf,
2666                            1, req.buflen)) {
2667                 DEBUG(10, ("create_outbuf failed\n"));
2668                 return false;
2669         }
2670         req.outbuf = (uint8_t *)outbuf;
2671
2672         SSVAL(req.outbuf, smb_vwv0, num_replies);
2673
2674         if (req.buflen > 0) {
2675                 memcpy(smb_buf(req.outbuf), req.buf, req.buflen);
2676         }
2677
2678         ok = srv_send_smb(req.sconn,
2679                           (char *)outbuf,
2680                           true, seqnum+1,
2681                           false, &req.pcd);
2682         TALLOC_FREE(outbuf);
2683         if (!ok) {
2684                 exit(1);
2685         }
2686
2687         return true;
2688 }
2689
2690 static void smbd_echo_exit(struct tevent_context *ev,
2691                            struct tevent_fd *fde, uint16_t flags,
2692                            void *private_data)
2693 {
2694         DEBUG(2, ("smbd_echo_exit: lost connection to parent\n"));
2695         exit(0);
2696 }
2697
2698 static void smbd_echo_got_packet(struct tevent_req *req);
2699
2700 static void smbd_echo_loop(struct smbd_server_connection *sconn,
2701                            int parent_pipe)
2702 {
2703         struct smbd_echo_state *state;
2704         struct tevent_req *read_req;
2705
2706         state = talloc_zero(sconn, struct smbd_echo_state);
2707         if (state == NULL) {
2708                 DEBUG(1, ("talloc failed\n"));
2709                 return;
2710         }
2711         state->sconn = sconn;
2712         state->parent_pipe = parent_pipe;
2713         state->ev = s3_tevent_context_init(state);
2714         if (state->ev == NULL) {
2715                 DEBUG(1, ("tevent_context_init failed\n"));
2716                 TALLOC_FREE(state);
2717                 return;
2718         }
2719         state->parent_fde = tevent_add_fd(state->ev, state, parent_pipe,
2720                                         TEVENT_FD_READ, smbd_echo_exit,
2721                                         state);
2722         if (state->parent_fde == NULL) {
2723                 DEBUG(1, ("tevent_add_fd failed\n"));
2724                 TALLOC_FREE(state);
2725                 return;
2726         }
2727
2728         read_req = smbd_echo_read_send(state, state->ev, sconn);
2729         if (read_req == NULL) {
2730                 DEBUG(1, ("smbd_echo_read_send failed\n"));
2731                 TALLOC_FREE(state);
2732                 return;
2733         }
2734         tevent_req_set_callback(read_req, smbd_echo_got_packet, state);
2735
2736         while (true) {
2737                 if (tevent_loop_once(state->ev) == -1) {
2738                         DEBUG(1, ("tevent_loop_once failed: %s\n",
2739                                   strerror(errno)));
2740                         break;
2741                 }
2742         }
2743         TALLOC_FREE(state);
2744 }
2745
2746 static void smbd_echo_got_packet(struct tevent_req *req)
2747 {
2748         struct smbd_echo_state *state = tevent_req_callback_data(
2749                 req, struct smbd_echo_state);
2750         NTSTATUS status;
2751         char *buf = NULL;
2752         size_t buflen = 0;
2753         uint32_t seqnum = 0;
2754         bool reply;
2755
2756         status = smbd_echo_read_recv(req, state, &buf, &buflen, &seqnum);
2757         TALLOC_FREE(req);
2758         if (!NT_STATUS_IS_OK(status)) {
2759                 DEBUG(1, ("smbd_echo_read_recv returned %s\n",
2760                           nt_errstr(status)));
2761                 exit(1);
2762         }
2763
2764         reply = smbd_echo_reply(state, (uint8_t *)buf, buflen, seqnum);
2765         if (!reply) {
2766                 size_t num_pending;
2767                 struct iovec *tmp;
2768                 struct iovec *iov;
2769
2770                 num_pending = talloc_array_length(state->pending);
2771                 tmp = talloc_realloc(state, state->pending, struct iovec,
2772                                      num_pending+1);
2773                 if (tmp == NULL) {
2774                         DEBUG(1, ("talloc_realloc failed\n"));
2775                         exit(1);
2776                 }
2777                 state->pending = tmp;
2778
2779                 if (buflen >= smb_size) {
2780                         /*
2781                          * place the seqnum in the packet so that the main process
2782                          * can reply with signing
2783                          */
2784                         SIVAL(buf, smb_ss_field, seqnum);
2785                         SIVAL(buf, smb_ss_field+4, NT_STATUS_V(NT_STATUS_OK));
2786                 }
2787
2788                 iov = &state->pending[num_pending];
2789                 iov->iov_base = buf;
2790                 iov->iov_len = buflen;
2791
2792                 DEBUG(10,("echo_handler[%d]: forward to main\n",
2793                           (int)sys_getpid()));
2794                 smbd_echo_activate_writer(state);
2795         }
2796
2797         req = smbd_echo_read_send(state, state->ev, state->sconn);
2798         if (req == NULL) {
2799                 DEBUG(1, ("smbd_echo_read_send failed\n"));
2800                 exit(1);
2801         }
2802         tevent_req_set_callback(req, smbd_echo_got_packet, state);
2803 }
2804
2805
2806 /*
2807  * Handle SMBecho requests in a forked child process
2808  */
2809 bool fork_echo_handler(struct smbd_server_connection *sconn)
2810 {
2811         int listener_pipe[2];
2812         int res;
2813         pid_t child;
2814
2815         res = pipe(listener_pipe);
2816         if (res == -1) {
2817                 DEBUG(1, ("pipe() failed: %s\n", strerror(errno)));
2818                 return false;
2819         }
2820         sconn->smb1.echo_handler.socket_lock_fd = create_unlink_tmp(lp_lockdir());
2821         if (sconn->smb1.echo_handler.socket_lock_fd == -1) {
2822                 DEBUG(1, ("Could not create lock fd: %s\n", strerror(errno)));
2823                 goto fail;
2824         }
2825
2826         child = sys_fork();
2827         if (child == 0) {
2828                 NTSTATUS status;
2829
2830                 close(listener_pipe[0]);
2831                 set_blocking(listener_pipe[1], false);
2832
2833                 status = reinit_after_fork(sconn->msg_ctx,
2834                                            sconn->ev_ctx,
2835                                            false);
2836                 if (!NT_STATUS_IS_OK(status)) {
2837                         DEBUG(1, ("reinit_after_fork failed: %s\n",
2838                                   nt_errstr(status)));
2839                         exit(1);
2840                 }
2841                 smbd_echo_loop(sconn, listener_pipe[1]);
2842                 exit(0);
2843         }
2844         close(listener_pipe[1]);
2845         listener_pipe[1] = -1;
2846         sconn->smb1.echo_handler.trusted_fd = listener_pipe[0];
2847
2848         DEBUG(10,("fork_echo_handler: main[%d] echo_child[%d]\n", (int)sys_getpid(), child));
2849
2850         /*
2851          * Without smb signing this is the same as the normal smbd
2852          * listener. This needs to change once signing comes in.
2853          */
2854         sconn->smb1.echo_handler.trusted_fde = tevent_add_fd(sconn->ev_ctx,
2855                                         sconn,
2856                                         sconn->smb1.echo_handler.trusted_fd,
2857                                         TEVENT_FD_READ,
2858                                         smbd_server_echo_handler,
2859                                         sconn);
2860         if (sconn->smb1.echo_handler.trusted_fde == NULL) {
2861                 DEBUG(1, ("event_add_fd failed\n"));
2862                 goto fail;
2863         }
2864
2865         return true;
2866
2867 fail:
2868         if (listener_pipe[0] != -1) {
2869                 close(listener_pipe[0]);
2870         }
2871         if (listener_pipe[1] != -1) {
2872                 close(listener_pipe[1]);
2873         }
2874         sconn->smb1.echo_handler.trusted_fd = -1;
2875         if (sconn->smb1.echo_handler.socket_lock_fd != -1) {
2876                 close(sconn->smb1.echo_handler.socket_lock_fd);
2877         }
2878         sconn->smb1.echo_handler.trusted_fd = -1;
2879         sconn->smb1.echo_handler.socket_lock_fd = -1;
2880         return false;
2881 }
2882
2883 #if CLUSTER_SUPPORT
2884
2885 static NTSTATUS smbd_register_ips(struct smbd_server_connection *sconn,
2886                                   struct sockaddr_storage *srv,
2887                                   struct sockaddr_storage *clnt)
2888 {
2889         struct ctdbd_connection *cconn;
2890         char tmp_addr[INET6_ADDRSTRLEN];
2891         char *addr;
2892
2893         cconn = messaging_ctdbd_connection();
2894         if (cconn == NULL) {
2895                 return NT_STATUS_NO_MEMORY;
2896         }
2897
2898         client_socket_addr(sconn->sock, tmp_addr, sizeof(tmp_addr));
2899         addr = talloc_strdup(cconn, tmp_addr);
2900         if (addr == NULL) {
2901                 return NT_STATUS_NO_MEMORY;
2902         }
2903         return ctdbd_register_ips(cconn, srv, clnt, release_ip, addr);
2904 }
2905
2906 #endif
2907
2908 static bool uid_in_use(const struct user_struct *user, uid_t uid)
2909 {
2910         while (user) {
2911                 if (user->session_info &&
2912                     (user->session_info->unix_token->uid == uid)) {
2913                         return true;
2914                 }
2915                 user = user->next;
2916         }
2917         return false;
2918 }
2919
2920 static bool gid_in_use(const struct user_struct *user, gid_t gid)
2921 {
2922         while (user) {
2923                 if (user->session_info != NULL) {
2924                         int i;
2925                         struct security_unix_token *utok;
2926
2927                         utok = user->session_info->unix_token;
2928                         if (utok->gid == gid) {
2929                                 return true;
2930                         }
2931                         for(i=0; i<utok->ngroups; i++) {
2932                                 if (utok->groups[i] == gid) {
2933                                         return true;
2934                                 }
2935                         }
2936                 }
2937                 user = user->next;
2938         }
2939         return false;
2940 }
2941
2942 static bool sid_in_use(const struct user_struct *user,
2943                        const struct dom_sid *psid)
2944 {
2945         while (user) {
2946                 struct security_token *tok;
2947
2948                 if (user->session_info == NULL) {
2949                         continue;
2950                 }
2951                 tok = user->session_info->security_token;
2952                 if (tok == NULL) {
2953                         /*
2954                          * Not sure session_info->security_token can
2955                          * ever be NULL. This check might be not
2956                          * necessary.
2957                          */
2958                         continue;
2959                 }
2960                 if (security_token_has_sid(tok, psid)) {
2961                         return true;
2962                 }
2963                 user = user->next;
2964         }
2965         return false;
2966 }
2967
2968 static bool id_in_use(const struct user_struct *user,
2969                       const struct id_cache_ref *id)
2970 {
2971         switch(id->type) {
2972         case UID:
2973                 return uid_in_use(user, id->id.uid);
2974         case GID:
2975                 return gid_in_use(user, id->id.gid);
2976         case SID:
2977                 return sid_in_use(user, &id->id.sid);
2978         default:
2979                 break;
2980         }
2981         return false;
2982 }
2983
2984 static void smbd_id_cache_kill(struct messaging_context *msg_ctx,
2985                                void *private_data,
2986                                uint32_t msg_type,
2987                                struct server_id server_id,
2988                                DATA_BLOB* data)
2989 {
2990         const char *msg = (data && data->data)
2991                 ? (const char *)data->data : "<NULL>";
2992         struct user_struct *validated_users;
2993         struct id_cache_ref id;
2994         struct smbd_server_connection *sconn =
2995                 talloc_get_type_abort(private_data,
2996                 struct smbd_server_connection);
2997
2998         validated_users = sconn->smb1.sessions.validated_users;
2999
3000         if (!id_cache_ref_parse(msg, &id)) {
3001                 DEBUG(0, ("Invalid ?ID: %s\n", msg));
3002                 return;
3003         }
3004
3005         if (id_in_use(validated_users, &id)) {
3006                 exit_server_cleanly(msg);
3007         }
3008         id_cache_delete_from_cache(&id);
3009 }
3010
3011 /****************************************************************************
3012  Process commands from the client
3013 ****************************************************************************/
3014
3015 void smbd_process(struct tevent_context *ev_ctx,
3016                   struct smbd_server_connection *sconn)
3017 {
3018         TALLOC_CTX *frame = talloc_stackframe();
3019         struct sockaddr_storage ss;
3020         struct sockaddr *sa = NULL;
3021         socklen_t sa_socklen;
3022         struct tsocket_address *local_address = NULL;
3023         struct tsocket_address *remote_address = NULL;
3024         const char *locaddr = NULL;
3025         const char *remaddr = NULL;
3026         char *rhost;
3027         int ret;
3028
3029         if (lp_maxprotocol() >= PROTOCOL_SMB2_02) {
3030                 /*
3031                  * We're not making the decision here,
3032                  * we're just allowing the client
3033                  * to decide between SMB1 and SMB2
3034                  * with the first negprot
3035                  * packet.
3036                  */
3037                 sconn->using_smb2 = true;
3038         }
3039
3040         /* Ensure child is set to blocking mode */
3041         set_blocking(sconn->sock,True);
3042
3043         set_socket_options(sconn->sock, "SO_KEEPALIVE");
3044         set_socket_options(sconn->sock, lp_socket_options());
3045
3046         sa = (struct sockaddr *)(void *)&ss;
3047         sa_socklen = sizeof(ss);
3048         ret = getpeername(sconn->sock, sa, &sa_socklen);
3049         if (ret != 0) {
3050                 int level = (errno == ENOTCONN)?2:0;
3051                 DEBUG(level,("getpeername() failed - %s\n", strerror(errno)));
3052                 exit_server_cleanly("getpeername() failed.\n");
3053         }
3054         ret = tsocket_address_bsd_from_sockaddr(sconn,
3055                                                 sa, sa_socklen,
3056                                                 &remote_address);
3057         if (ret != 0) {
3058                 DEBUG(0,("%s: tsocket_address_bsd_from_sockaddr remote failed - %s\n",
3059                         __location__, strerror(errno)));
3060                 exit_server_cleanly("tsocket_address_bsd_from_sockaddr remote failed.\n");
3061         }
3062
3063         sa = (struct sockaddr *)(void *)&ss;
3064         sa_socklen = sizeof(ss);
3065         ret = getsockname(sconn->sock, sa, &sa_socklen);
3066         if (ret != 0) {
3067                 int level = (errno == ENOTCONN)?2:0;
3068                 DEBUG(level,("getsockname() failed - %s\n", strerror(errno)));
3069                 exit_server_cleanly("getsockname() failed.\n");
3070         }
3071         ret = tsocket_address_bsd_from_sockaddr(sconn,
3072                                                 sa, sa_socklen,
3073                                                 &local_address);
3074         if (ret != 0) {
3075                 DEBUG(0,("%s: tsocket_address_bsd_from_sockaddr remote failed - %s\n",
3076                         __location__, strerror(errno)));
3077                 exit_server_cleanly("tsocket_address_bsd_from_sockaddr remote failed.\n");
3078         }
3079
3080         sconn->local_address = local_address;
3081         sconn->remote_address = remote_address;
3082
3083         if (tsocket_address_is_inet(local_address, "ip")) {
3084                 locaddr = tsocket_address_inet_addr_string(
3085                                 sconn->local_address,
3086                                 talloc_tos());
3087                 if (locaddr == NULL) {
3088                         DEBUG(0,("%s: tsocket_address_inet_addr_string local failed - %s\n",
3089                                  __location__, strerror(errno)));
3090                         exit_server_cleanly("tsocket_address_inet_addr_string local failed.\n");
3091                 }
3092         } else {
3093                 locaddr = "0.0.0.0";
3094         }
3095
3096         if (tsocket_address_is_inet(remote_address, "ip")) {
3097                 remaddr = tsocket_address_inet_addr_string(
3098                                 sconn->remote_address,
3099                                 talloc_tos());
3100                 if (remaddr == NULL) {
3101                         DEBUG(0,("%s: tsocket_address_inet_addr_string remote failed - %s\n",
3102                                  __location__, strerror(errno)));
3103                         exit_server_cleanly("tsocket_address_inet_addr_string remote failed.\n");
3104                 }
3105         } else {
3106                 remaddr = "0.0.0.0";
3107         }
3108
3109         /* this is needed so that we get decent entries
3110            in smbstatus for port 445 connects */
3111         set_remote_machine_name(remaddr, false);
3112         reload_services(sconn, conn_snum_used, true);
3113
3114         /*
3115          * Before the first packet, check the global hosts allow/ hosts deny
3116          * parameters before doing any parsing of packets passed to us by the
3117          * client. This prevents attacks on our parsing code from hosts not in
3118          * the hosts allow list.
3119          */
3120
3121         ret = get_remote_hostname(remote_address,
3122                                   &rhost,
3123                                   talloc_tos());
3124         if (ret < 0) {
3125                 DEBUG(0,("%s: get_remote_hostname failed - %s\n",
3126                         __location__, strerror(errno)));
3127                 exit_server_cleanly("get_remote_hostname failed.\n");
3128         }
3129         if (strequal(rhost, "UNKNOWN")) {
3130                 rhost = talloc_strdup(talloc_tos(), remaddr);
3131         }
3132         sconn->remote_hostname = talloc_move(sconn, &rhost);
3133
3134         sub_set_socket_ids(remaddr,
3135                            sconn->remote_hostname,
3136                            locaddr);
3137
3138         if (!allow_access(lp_hostsdeny(-1), lp_hostsallow(-1),
3139                           sconn->remote_hostname,
3140                           remaddr)) {
3141                 /*
3142                  * send a negative session response "not listening on calling
3143                  * name"
3144                  */
3145                 unsigned char buf[5] = {0x83, 0, 0, 1, 0x81};
3146                 DEBUG( 1, ("Connection denied from %s to %s\n",
3147                            tsocket_address_string(remote_address, talloc_tos()),
3148                            tsocket_address_string(local_address, talloc_tos())));
3149                 (void)srv_send_smb(sconn,(char *)buf, false,
3150                                    0, false, NULL);
3151                 exit_server_cleanly("connection denied");
3152         }
3153
3154         DEBUG(10, ("Connection allowed from %s to %s\n",
3155                    tsocket_address_string(remote_address, talloc_tos()),
3156                    tsocket_address_string(local_address, talloc_tos())));
3157
3158         init_modules();
3159
3160         smb_perfcount_init();
3161
3162         if (!init_account_policy()) {
3163                 exit_server("Could not open account policy tdb.\n");
3164         }
3165
3166         if (*lp_rootdir()) {
3167                 if (chroot(lp_rootdir()) != 0) {
3168                         DEBUG(0,("Failed to change root to %s\n", lp_rootdir()));
3169                         exit_server("Failed to chroot()");
3170                 }
3171                 if (chdir("/") == -1) {
3172                         DEBUG(0,("Failed to chdir to / on chroot to %s\n", lp_rootdir()));
3173                         exit_server("Failed to chroot()");
3174                 }
3175                 DEBUG(0,("Changed root to %s\n", lp_rootdir()));
3176         }
3177
3178         if (!srv_init_signing(sconn)) {
3179                 exit_server("Failed to init smb_signing");
3180         }
3181
3182         /* Setup oplocks */
3183         if (!init_oplocks(sconn))
3184                 exit_server("Failed to init oplocks");
3185
3186         /* register our message handlers */
3187         messaging_register(sconn->msg_ctx, sconn,
3188                            MSG_SMB_FORCE_TDIS, msg_force_tdis);
3189         messaging_register(sconn->msg_ctx, sconn,
3190                            MSG_SMB_CLOSE_FILE, msg_close_file);
3191         messaging_register(sconn->msg_ctx, sconn,
3192                            MSG_SMB_FILE_RENAME, msg_file_was_renamed);
3193
3194         id_cache_register_msgs(sconn->msg_ctx);
3195         messaging_deregister(sconn->msg_ctx, ID_CACHE_KILL, NULL);
3196         messaging_register(sconn->msg_ctx, sconn,
3197                            ID_CACHE_KILL, smbd_id_cache_kill);
3198
3199         messaging_deregister(sconn->msg_ctx,
3200                              MSG_SMB_CONF_UPDATED, sconn->ev_ctx);
3201         messaging_register(sconn->msg_ctx, sconn,
3202                            MSG_SMB_CONF_UPDATED, smbd_conf_updated);
3203
3204         /*
3205          * Use the default MSG_DEBUG handler to avoid rebroadcasting
3206          * MSGs to all child processes
3207          */
3208         messaging_deregister(sconn->msg_ctx,
3209                              MSG_DEBUG, NULL);
3210         messaging_register(sconn->msg_ctx, NULL,
3211                            MSG_DEBUG, debug_message);
3212
3213         if ((lp_keepalive() != 0)
3214             && !(event_add_idle(ev_ctx, NULL,
3215                                 timeval_set(lp_keepalive(), 0),
3216                                 "keepalive", keepalive_fn,
3217                                 sconn))) {
3218                 DEBUG(0, ("Could not add keepalive event\n"));
3219                 exit(1);
3220         }
3221
3222         if (!(event_add_idle(ev_ctx, NULL,
3223                              timeval_set(IDLE_CLOSED_TIMEOUT, 0),
3224                              "deadtime", deadtime_fn, sconn))) {
3225                 DEBUG(0, ("Could not add deadtime event\n"));
3226                 exit(1);
3227         }
3228
3229         if (!(event_add_idle(ev_ctx, NULL,
3230                              timeval_set(SMBD_HOUSEKEEPING_INTERVAL, 0),
3231                              "housekeeping", housekeeping_fn, sconn))) {
3232                 DEBUG(0, ("Could not add housekeeping event\n"));
3233                 exit(1);
3234         }
3235
3236 #ifdef CLUSTER_SUPPORT
3237
3238         if (lp_clustering()) {
3239                 /*
3240                  * We need to tell ctdb about our client's TCP
3241                  * connection, so that for failover ctdbd can send
3242                  * tickle acks, triggering a reconnection by the
3243                  * client.
3244                  */
3245
3246                 struct sockaddr_storage srv, clnt;
3247
3248                 if (client_get_tcp_info(sconn->sock, &srv, &clnt) == 0) {
3249                         NTSTATUS status;
3250                         status = smbd_register_ips(sconn, &srv, &clnt);
3251                         if (!NT_STATUS_IS_OK(status)) {
3252                                 DEBUG(0, ("ctdbd_register_ips failed: %s\n",
3253                                           nt_errstr(status)));
3254                         }
3255                 } else
3256                 {
3257                         DEBUG(0,("Unable to get tcp info for "
3258                                  "CTDB_CONTROL_TCP_CLIENT: %s\n",
3259                                  strerror(errno)));
3260                 }
3261         }
3262
3263 #endif
3264
3265         sconn->nbt.got_session = false;
3266
3267         sconn->smb1.negprot.max_recv = MIN(lp_maxxmit(),BUFFER_SIZE);
3268
3269         sconn->smb1.sessions.done_sesssetup = false;
3270         sconn->smb1.sessions.max_send = BUFFER_SIZE;
3271         sconn->smb1.sessions.last_session_tag = UID_FIELD_INVALID;
3272         /* users from session setup */
3273         sconn->smb1.sessions.session_userlist = NULL;
3274         /* workgroup from session setup. */
3275         sconn->smb1.sessions.session_workgroup = NULL;
3276         /* this holds info on user ids that are already validated for this VC */
3277         sconn->smb1.sessions.validated_users = NULL;
3278         sconn->smb1.sessions.next_vuid = VUID_OFFSET;
3279         sconn->smb1.sessions.num_validated_vuids = 0;
3280
3281         conn_init(sconn);
3282         if (!init_dptrs(sconn)) {
3283                 exit_server("init_dptrs() failed");
3284         }
3285
3286         sconn->smb1.fde = event_add_fd(ev_ctx,
3287                                                   sconn,
3288                                                   sconn->sock,
3289                                                   EVENT_FD_READ,
3290                                                   smbd_server_connection_handler,
3291                                                   sconn);
3292         if (!sconn->smb1.fde) {
3293                 exit_server("failed to create smbd_server_connection fde");
3294         }
3295
3296         TALLOC_FREE(frame);
3297
3298         while (True) {
3299                 frame = talloc_stackframe_pool(8192);
3300
3301                 errno = 0;
3302                 if (tevent_loop_once(ev_ctx) == -1) {
3303                         if (errno != EINTR) {
3304                                 DEBUG(3, ("tevent_loop_once failed: %s,"
3305                                           " exiting\n", strerror(errno) ));
3306                                 break;
3307                         }
3308                 }
3309
3310                 TALLOC_FREE(frame);
3311         }
3312
3313         exit_server_cleanly(NULL);
3314 }
3315
3316 bool req_is_in_chain(struct smb_request *req)
3317 {
3318         if (req->vwv != (const uint16_t *)(req->inbuf+smb_vwv)) {
3319                 /*
3320                  * We're right now handling a subsequent request, so we must
3321                  * be in a chain
3322                  */
3323                 return true;
3324         }
3325
3326         if (!is_andx_req(req->cmd)) {
3327                 return false;
3328         }
3329
3330         if (req->wct < 2) {
3331                 /*
3332                  * Okay, an illegal request, but definitely not chained :-)
3333                  */
3334                 return false;
3335         }
3336
3337         return (CVAL(req->vwv+0, 0) != 0xFF);
3338 }