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         size_t bytes_alignment  = 0;
1787         uint32_t num_bytes      = smb_buflen(andx_buf);
1788         const uint8_t *bytes    = (const uint8_t *)smb_buf(andx_buf);
1789
1790         uint8_t *outbuf;
1791         size_t old_size, new_size;
1792         size_t ofs;
1793         size_t chain_padding = 0;
1794         size_t bytes_padding = 0;
1795         bool first_request;
1796
1797         old_size = talloc_get_size(*poutbuf);
1798
1799         /*
1800          * old_size == smb_wct means we're pushing the first request in for
1801          * libsmb/
1802          */
1803
1804         first_request = (old_size == smb_wct);
1805
1806         if (!first_request && ((old_size % 4) != 0)) {
1807                 /*
1808                  * Align the wct field of subsequent requests to a 4-byte
1809                  * boundary
1810                  */
1811                 chain_padding = 4 - (old_size % 4);
1812         }
1813
1814         /*
1815          * After the old request comes the new wct field (1 byte), the vwv's
1816          * and the num_bytes field. After at we might need to align the bytes
1817          * given to us to "bytes_alignment", increasing the num_bytes value.
1818          */
1819
1820         new_size = old_size + chain_padding + 1 + wct * sizeof(uint16_t) + 2;
1821
1822         if ((bytes_alignment != 0) && ((new_size % bytes_alignment) != 0)) {
1823                 bytes_padding = bytes_alignment - (new_size % bytes_alignment);
1824         }
1825
1826         new_size += bytes_padding + num_bytes;
1827
1828         if ((smb_command != SMBwriteX) && (new_size > 0xffff)) {
1829                 DEBUG(1, ("smb_splice_chain: %u bytes won't fit\n",
1830                           (unsigned)new_size));
1831                 return false;
1832         }
1833
1834         outbuf = talloc_realloc(NULL, *poutbuf, uint8_t, new_size);
1835         if (outbuf == NULL) {
1836                 DEBUG(0, ("talloc failed\n"));
1837                 return false;
1838         }
1839         *poutbuf = outbuf;
1840
1841         if (first_request) {
1842                 SCVAL(outbuf, smb_com, smb_command);
1843         } else {
1844                 size_t andx_cmd_ofs;
1845
1846                 if (!find_andx_cmd_ofs(outbuf, &andx_cmd_ofs)) {
1847                         DEBUG(1, ("invalid command chain\n"));
1848                         *poutbuf = talloc_realloc(
1849                                 NULL, *poutbuf, uint8_t, old_size);
1850                         return false;
1851                 }
1852
1853                 if (chain_padding != 0) {
1854                         memset(outbuf + old_size, 0, chain_padding);
1855                         old_size += chain_padding;
1856                 }
1857
1858                 SCVAL(outbuf, andx_cmd_ofs, smb_command);
1859                 SSVAL(outbuf, andx_cmd_ofs + 2, old_size - 4);
1860         }
1861
1862         ofs = old_size;
1863
1864         /*
1865          * Push the chained request:
1866          *
1867          * wct field
1868          */
1869
1870         SCVAL(outbuf, ofs, wct);
1871         ofs += 1;
1872
1873         /*
1874          * vwv array
1875          */
1876
1877         memcpy(outbuf + ofs, vwv, sizeof(uint16_t) * wct);
1878         ofs += sizeof(uint16_t) * wct;
1879
1880         /*
1881          * bcc (byte count)
1882          */
1883
1884         SSVAL(outbuf, ofs, num_bytes + bytes_padding);
1885         ofs += sizeof(uint16_t);
1886
1887         /*
1888          * padding
1889          */
1890
1891         if (bytes_padding != 0) {
1892                 memset(outbuf + ofs, 0, bytes_padding);
1893                 ofs += bytes_padding;
1894         }
1895
1896         /*
1897          * The bytes field
1898          */
1899
1900         memcpy(outbuf + ofs, bytes, num_bytes);
1901
1902         return true;
1903 }
1904
1905 /****************************************************************************
1906  Construct a chained reply and add it to the already made reply
1907 ****************************************************************************/
1908
1909 void chain_reply(struct smb_request *req)
1910 {
1911         size_t smblen = smb_len(req->inbuf);
1912         size_t already_used, length_needed;
1913         uint8_t chain_cmd;
1914         uint32_t chain_offset;  /* uint32_t to avoid overflow */
1915
1916         uint8_t wct;
1917         const uint16_t *vwv;
1918         uint16_t buflen;
1919         const uint8_t *buf;
1920
1921         if (IVAL(req->outbuf, smb_rcls) != 0) {
1922                 fixup_chain_error_packet(req);
1923         }
1924
1925         /*
1926          * Any of the AndX requests and replies have at least a wct of
1927          * 2. vwv[0] is the next command, vwv[1] is the offset from the
1928          * beginning of the SMB header to the next wct field.
1929          *
1930          * None of the AndX requests put anything valuable in vwv[0] and [1],
1931          * so we can overwrite it here to form the chain.
1932          */
1933
1934         if ((req->wct < 2) || (CVAL(req->outbuf, smb_wct) < 2)) {
1935                 if (req->chain_outbuf == NULL) {
1936                         req->chain_outbuf = talloc_realloc(
1937                                 req, req->outbuf, uint8_t,
1938                                 smb_len(req->outbuf) + 4);
1939                         if (req->chain_outbuf == NULL) {
1940                                 smb_panic("talloc failed");
1941                         }
1942                 }
1943                 req->outbuf = NULL;
1944                 goto error;
1945         }
1946
1947         /*
1948          * Here we assume that this is the end of the chain. For that we need
1949          * to set "next command" to 0xff and the offset to 0. If we later find
1950          * more commands in the chain, this will be overwritten again.
1951          */
1952
1953         SCVAL(req->outbuf, smb_vwv0, 0xff);
1954         SCVAL(req->outbuf, smb_vwv0+1, 0);
1955         SSVAL(req->outbuf, smb_vwv1, 0);
1956
1957         if (req->chain_outbuf == NULL) {
1958                 /*
1959                  * In req->chain_outbuf we collect all the replies. Start the
1960                  * chain by copying in the first reply.
1961                  *
1962                  * We do the realloc because later on we depend on
1963                  * talloc_get_size to determine the length of
1964                  * chain_outbuf. The reply_xxx routines might have
1965                  * over-allocated (reply_pipe_read_and_X used to be such an
1966                  * example).
1967                  */
1968                 req->chain_outbuf = talloc_realloc(
1969                         req, req->outbuf, uint8_t, smb_len(req->outbuf) + 4);
1970                 if (req->chain_outbuf == NULL) {
1971                         smb_panic("talloc failed");
1972                 }
1973                 req->outbuf = NULL;
1974         } else {
1975                 /*
1976                  * Update smb headers where subsequent chained commands
1977                  * may have updated them.
1978                  */
1979                 SSVAL(req->chain_outbuf, smb_tid, SVAL(req->outbuf, smb_tid));
1980                 SSVAL(req->chain_outbuf, smb_uid, SVAL(req->outbuf, smb_uid));
1981
1982                 if (!smb_splice_chain(&req->chain_outbuf, req->outbuf)) {
1983                         goto error;
1984                 }
1985                 TALLOC_FREE(req->outbuf);
1986         }
1987
1988         /*
1989          * We use the old request's vwv field to grab the next chained command
1990          * and offset into the chained fields.
1991          */
1992
1993         chain_cmd = CVAL(req->vwv+0, 0);
1994         chain_offset = SVAL(req->vwv+1, 0);
1995
1996         if (chain_cmd == 0xff) {
1997                 /*
1998                  * End of chain, no more requests from the client. So ship the
1999                  * replies.
2000                  */
2001                 smb_setlen((char *)(req->chain_outbuf),
2002                            talloc_get_size(req->chain_outbuf) - 4);
2003
2004                 if (!srv_send_smb(req->sconn, (char *)req->chain_outbuf,
2005                                   true, req->seqnum+1,
2006                                   IS_CONN_ENCRYPTED(req->conn)
2007                                   ||req->encrypted,
2008                                   &req->pcd)) {
2009                         exit_server_cleanly("chain_reply: srv_send_smb "
2010                                             "failed.");
2011                 }
2012                 TALLOC_FREE(req->chain_outbuf);
2013                 req->done = true;
2014                 return;
2015         }
2016
2017         /* add a new perfcounter for this element of chain */
2018         SMB_PERFCOUNT_ADD(&req->pcd);
2019         SMB_PERFCOUNT_SET_OP(&req->pcd, chain_cmd);
2020         SMB_PERFCOUNT_SET_MSGLEN_IN(&req->pcd, smblen);
2021
2022         /*
2023          * Check if the client tries to fool us. The chain offset
2024          * needs to point beyond the current request in the chain, it
2025          * needs to strictly grow. Otherwise we might be tricked into
2026          * an endless loop always processing the same request over and
2027          * over again. We used to assume that vwv and the byte buffer
2028          * array in a chain are always attached, but OS/2 the
2029          * Write&X/Read&X chain puts the Read&X vwv array right behind
2030          * the Write&X vwv chain. The Write&X bcc array is put behind
2031          * the Read&X vwv array. So now we check whether the chain
2032          * offset points strictly behind the previous vwv
2033          * array. req->buf points right after the vwv array of the
2034          * previous request. See
2035          * https://bugzilla.samba.org/show_bug.cgi?id=8360 for more
2036          * information.
2037          */
2038
2039         already_used = PTR_DIFF(req->buf, smb_base(req->inbuf));
2040         if (chain_offset <= already_used) {
2041                 goto error;
2042         }
2043
2044         /*
2045          * Next check: Make sure the chain offset does not point beyond the
2046          * overall smb request length.
2047          */
2048
2049         length_needed = chain_offset+1; /* wct */
2050         if (length_needed > smblen) {
2051                 goto error;
2052         }
2053
2054         /*
2055          * Now comes the pointer magic. Goal here is to set up req->vwv and
2056          * req->buf correctly again to be able to call the subsequent
2057          * switch_message(). The chain offset (the former vwv[1]) points at
2058          * the new wct field.
2059          */
2060
2061         wct = CVAL(smb_base(req->inbuf), chain_offset);
2062
2063         /*
2064          * Next consistency check: Make the new vwv array fits in the overall
2065          * smb request.
2066          */
2067
2068         length_needed += (wct+1)*sizeof(uint16_t); /* vwv+buflen */
2069         if (length_needed > smblen) {
2070                 goto error;
2071         }
2072         vwv = (const uint16_t *)(smb_base(req->inbuf) + chain_offset + 1);
2073
2074         /*
2075          * Now grab the new byte buffer....
2076          */
2077
2078         buflen = SVAL(vwv+wct, 0);
2079
2080         /*
2081          * .. and check that it fits.
2082          */
2083
2084         length_needed += buflen;
2085         if (length_needed > smblen) {
2086                 goto error;
2087         }
2088         buf = (const uint8_t *)(vwv+wct+1);
2089
2090         req->cmd = chain_cmd;
2091         req->wct = wct;
2092         req->vwv = discard_const_p(uint16_t, vwv);
2093         req->buflen = buflen;
2094         req->buf = buf;
2095
2096         switch_message(chain_cmd, req, smblen);
2097
2098         if (req->outbuf == NULL) {
2099                 /*
2100                  * This happens if the chained command has suspended itself or
2101                  * if it has called srv_send_smb() itself.
2102                  */
2103                 return;
2104         }
2105
2106         /*
2107          * We end up here if the chained command was not itself chained or
2108          * suspended, but for example a close() command. We now need to splice
2109          * the chained commands' outbuf into the already built up chain_outbuf
2110          * and ship the result.
2111          */
2112         goto done;
2113
2114  error:
2115         /*
2116          * We end up here if there's any error in the chain syntax. Report a
2117          * DOS error, just like Windows does.
2118          */
2119         reply_force_doserror(req, ERRSRV, ERRerror);
2120         fixup_chain_error_packet(req);
2121
2122  done:
2123         /*
2124          * This scary statement intends to set the
2125          * FLAGS2_32_BIT_ERROR_CODES flg2 field in req->chain_outbuf
2126          * to the value req->outbuf carries
2127          */
2128         SSVAL(req->chain_outbuf, smb_flg2,
2129               (SVAL(req->chain_outbuf, smb_flg2) & ~FLAGS2_32_BIT_ERROR_CODES)
2130               | (SVAL(req->outbuf, smb_flg2) & FLAGS2_32_BIT_ERROR_CODES));
2131
2132         /*
2133          * Transfer the error codes from the subrequest to the main one
2134          */
2135         SSVAL(req->chain_outbuf, smb_rcls, SVAL(req->outbuf, smb_rcls));
2136         SSVAL(req->chain_outbuf, smb_err, SVAL(req->outbuf, smb_err));
2137
2138         if (!smb_splice_chain(&req->chain_outbuf, req->outbuf)) {
2139                 exit_server_cleanly("chain_reply: smb_splice_chain failed\n");
2140         }
2141         TALLOC_FREE(req->outbuf);
2142
2143         smb_setlen((char *)(req->chain_outbuf),
2144                    talloc_get_size(req->chain_outbuf) - 4);
2145
2146         show_msg((char *)(req->chain_outbuf));
2147
2148         if (!srv_send_smb(req->sconn, (char *)req->chain_outbuf,
2149                           true, req->seqnum+1,
2150                           IS_CONN_ENCRYPTED(req->conn)||req->encrypted,
2151                           &req->pcd)) {
2152                 exit_server_cleanly("chain_reply: srv_send_smb failed.");
2153         }
2154         TALLOC_FREE(req->chain_outbuf);
2155         req->done = true;
2156 }
2157
2158 /****************************************************************************
2159  Check if services need reloading.
2160 ****************************************************************************/
2161
2162 static void check_reload(struct smbd_server_connection *sconn, time_t t)
2163 {
2164
2165         if (last_smb_conf_reload_time == 0) {
2166                 last_smb_conf_reload_time = t;
2167         }
2168
2169         if (t >= last_smb_conf_reload_time+SMBD_RELOAD_CHECK) {
2170                 reload_services(sconn, conn_snum_used, true);
2171                 last_smb_conf_reload_time = t;
2172         }
2173 }
2174
2175 static bool fd_is_readable(int fd)
2176 {
2177         int ret, revents;
2178
2179         ret = poll_one_fd(fd, POLLIN|POLLHUP, 0, &revents);
2180
2181         return ((ret > 0) && ((revents & (POLLIN|POLLHUP|POLLERR)) != 0));
2182
2183 }
2184
2185 static void smbd_server_connection_write_handler(
2186         struct smbd_server_connection *sconn)
2187 {
2188         /* TODO: make write nonblocking */
2189 }
2190
2191 static void smbd_server_connection_read_handler(
2192         struct smbd_server_connection *sconn, int fd)
2193 {
2194         uint8_t *inbuf = NULL;
2195         size_t inbuf_len = 0;
2196         size_t unread_bytes = 0;
2197         bool encrypted = false;
2198         TALLOC_CTX *mem_ctx = talloc_tos();
2199         NTSTATUS status;
2200         uint32_t seqnum;
2201
2202         bool from_client;
2203
2204         if (lp_async_smb_echo_handler()
2205             && fd_is_readable(sconn->smb1.echo_handler.trusted_fd)) {
2206                 /*
2207                  * This is the super-ugly hack to prefer the packets
2208                  * forwarded by the echo handler over the ones by the
2209                  * client directly
2210                  */
2211                 fd = sconn->smb1.echo_handler.trusted_fd;
2212         }
2213
2214         from_client = (sconn->sock == fd);
2215
2216         if (from_client) {
2217                 smbd_lock_socket(sconn);
2218
2219                 if (!fd_is_readable(fd)) {
2220                         DEBUG(10,("the echo listener was faster\n"));
2221                         smbd_unlock_socket(sconn);
2222                         return;
2223                 }
2224         }
2225
2226         /* TODO: make this completely nonblocking */
2227         status = receive_smb_talloc(mem_ctx, sconn, fd,
2228                                     (char **)(void *)&inbuf,
2229                                     0, /* timeout */
2230                                     &unread_bytes,
2231                                     &encrypted,
2232                                     &inbuf_len, &seqnum,
2233                                     false /* trusted channel */);
2234
2235         if (from_client) {
2236                 smbd_unlock_socket(sconn);
2237         }
2238
2239         if (NT_STATUS_EQUAL(status, NT_STATUS_RETRY)) {
2240                 goto process;
2241         }
2242         if (NT_STATUS_IS_ERR(status)) {
2243                 exit_server_cleanly("failed to receive smb request");
2244         }
2245         if (!NT_STATUS_IS_OK(status)) {
2246                 return;
2247         }
2248
2249 process:
2250         process_smb(sconn, inbuf, inbuf_len, unread_bytes,
2251                     seqnum, encrypted, NULL);
2252 }
2253
2254 static void smbd_server_connection_handler(struct event_context *ev,
2255                                            struct fd_event *fde,
2256                                            uint16_t flags,
2257                                            void *private_data)
2258 {
2259         struct smbd_server_connection *conn = talloc_get_type(private_data,
2260                                               struct smbd_server_connection);
2261
2262         if (flags & EVENT_FD_WRITE) {
2263                 smbd_server_connection_write_handler(conn);
2264                 return;
2265         }
2266         if (flags & EVENT_FD_READ) {
2267                 smbd_server_connection_read_handler(conn, conn->sock);
2268                 return;
2269         }
2270 }
2271
2272 static void smbd_server_echo_handler(struct event_context *ev,
2273                                      struct fd_event *fde,
2274                                      uint16_t flags,
2275                                      void *private_data)
2276 {
2277         struct smbd_server_connection *conn = talloc_get_type(private_data,
2278                                               struct smbd_server_connection);
2279
2280         if (flags & EVENT_FD_WRITE) {
2281                 smbd_server_connection_write_handler(conn);
2282                 return;
2283         }
2284         if (flags & EVENT_FD_READ) {
2285                 smbd_server_connection_read_handler(
2286                         conn, conn->smb1.echo_handler.trusted_fd);
2287                 return;
2288         }
2289 }
2290
2291 #ifdef CLUSTER_SUPPORT
2292 /****************************************************************************
2293 received when we should release a specific IP
2294 ****************************************************************************/
2295 static void release_ip(const char *ip, void *priv)
2296 {
2297         const char *addr = (const char *)priv;
2298         const char *p = addr;
2299
2300         if (strncmp("::ffff:", addr, 7) == 0) {
2301                 p = addr + 7;
2302         }
2303
2304         DEBUG(10, ("Got release IP message for %s, "
2305                    "our address is %s\n", ip, p));
2306
2307         if ((strcmp(p, ip) == 0) || ((p != addr) && strcmp(addr, ip) == 0)) {
2308                 /* we can't afford to do a clean exit - that involves
2309                    database writes, which would potentially mean we
2310                    are still running after the failover has finished -
2311                    we have to get rid of this process ID straight
2312                    away */
2313                 DEBUG(0,("Got release IP message for our IP %s - exiting immediately\n",
2314                         ip));
2315                 /* note we must exit with non-zero status so the unclean handler gets
2316                    called in the parent, so that the brl database is tickled */
2317                 _exit(1);
2318         }
2319 }
2320
2321 static int client_get_tcp_info(int sock, struct sockaddr_storage *server,
2322                                struct sockaddr_storage *client)
2323 {
2324         socklen_t length;
2325         length = sizeof(*server);
2326         if (getsockname(sock, (struct sockaddr *)server, &length) != 0) {
2327                 return -1;
2328         }
2329         length = sizeof(*client);
2330         if (getpeername(sock, (struct sockaddr *)client, &length) != 0) {
2331                 return -1;
2332         }
2333         return 0;
2334 }
2335 #endif
2336
2337 /*
2338  * Send keepalive packets to our client
2339  */
2340 static bool keepalive_fn(const struct timeval *now, void *private_data)
2341 {
2342         struct smbd_server_connection *sconn = talloc_get_type_abort(
2343                 private_data, struct smbd_server_connection);
2344         bool ret;
2345
2346         if (sconn->using_smb2) {
2347                 /* Don't do keepalives on an SMB2 connection. */
2348                 return false;
2349         }
2350
2351         smbd_lock_socket(sconn);
2352         ret = send_keepalive(sconn->sock);
2353         smbd_unlock_socket(sconn);
2354
2355         if (!ret) {
2356                 char addr[INET6_ADDRSTRLEN];
2357                 /*
2358                  * Try and give an error message saying what
2359                  * client failed.
2360                  */
2361                 DEBUG(0, ("send_keepalive failed for client %s. "
2362                           "Error %s - exiting\n",
2363                           get_peer_addr(sconn->sock, addr, sizeof(addr)),
2364                           strerror(errno)));
2365                 return False;
2366         }
2367         return True;
2368 }
2369
2370 /*
2371  * Do the recurring check if we're idle
2372  */
2373 static bool deadtime_fn(const struct timeval *now, void *private_data)
2374 {
2375         struct smbd_server_connection *sconn =
2376                 (struct smbd_server_connection *)private_data;
2377
2378         if ((conn_num_open(sconn) == 0)
2379             || (conn_idle_all(sconn, now->tv_sec))) {
2380                 DEBUG( 2, ( "Closing idle connection\n" ) );
2381                 messaging_send(sconn->msg_ctx,
2382                                messaging_server_id(sconn->msg_ctx),
2383                                MSG_SHUTDOWN, &data_blob_null);
2384                 return False;
2385         }
2386
2387         return True;
2388 }
2389
2390 /*
2391  * Do the recurring log file and smb.conf reload checks.
2392  */
2393
2394 static bool housekeeping_fn(const struct timeval *now, void *private_data)
2395 {
2396         struct smbd_server_connection *sconn = talloc_get_type_abort(
2397                 private_data, struct smbd_server_connection);
2398
2399         DEBUG(5, ("housekeeping\n"));
2400
2401         change_to_root_user();
2402
2403         /* update printer queue caches if necessary */
2404         update_monitored_printq_cache(sconn->msg_ctx);
2405
2406         /* check if we need to reload services */
2407         check_reload(sconn, time_mono(NULL));
2408
2409         /* Change machine password if neccessary. */
2410         attempt_machine_password_change();
2411
2412         /*
2413          * Force a log file check.
2414          */
2415         force_check_log_size();
2416         check_log_size();
2417         return true;
2418 }
2419
2420 /*
2421  * Read an smb packet in the echo handler child, giving the parent
2422  * smbd one second to react once the socket becomes readable.
2423  */
2424
2425 struct smbd_echo_read_state {
2426         struct tevent_context *ev;
2427         struct smbd_server_connection *sconn;
2428
2429         char *buf;
2430         size_t buflen;
2431         uint32_t seqnum;
2432 };
2433
2434 static void smbd_echo_read_readable(struct tevent_req *subreq);
2435 static void smbd_echo_read_waited(struct tevent_req *subreq);
2436
2437 static struct tevent_req *smbd_echo_read_send(
2438         TALLOC_CTX *mem_ctx, struct tevent_context *ev,
2439         struct smbd_server_connection *sconn)
2440 {
2441         struct tevent_req *req, *subreq;
2442         struct smbd_echo_read_state *state;
2443
2444         req = tevent_req_create(mem_ctx, &state,
2445                                 struct smbd_echo_read_state);
2446         if (req == NULL) {
2447                 return NULL;
2448         }
2449         state->ev = ev;
2450         state->sconn = sconn;
2451
2452         subreq = wait_for_read_send(state, ev, sconn->sock);
2453         if (tevent_req_nomem(subreq, req)) {
2454                 return tevent_req_post(req, ev);
2455         }
2456         tevent_req_set_callback(subreq, smbd_echo_read_readable, req);
2457         return req;
2458 }
2459
2460 static void smbd_echo_read_readable(struct tevent_req *subreq)
2461 {
2462         struct tevent_req *req = tevent_req_callback_data(
2463                 subreq, struct tevent_req);
2464         struct smbd_echo_read_state *state = tevent_req_data(
2465                 req, struct smbd_echo_read_state);
2466         bool ok;
2467         int err;
2468
2469         ok = wait_for_read_recv(subreq, &err);
2470         TALLOC_FREE(subreq);
2471         if (!ok) {
2472                 tevent_req_nterror(req, map_nt_error_from_unix(err));
2473                 return;
2474         }
2475
2476         /*
2477          * Give the parent smbd one second to step in
2478          */
2479
2480         subreq = tevent_wakeup_send(
2481                 state, state->ev, timeval_current_ofs(1, 0));
2482         if (tevent_req_nomem(subreq, req)) {
2483                 return;
2484         }
2485         tevent_req_set_callback(subreq, smbd_echo_read_waited, req);
2486 }
2487
2488 static void smbd_echo_read_waited(struct tevent_req *subreq)
2489 {
2490         struct tevent_req *req = tevent_req_callback_data(
2491                 subreq, struct tevent_req);
2492         struct smbd_echo_read_state *state = tevent_req_data(
2493                 req, struct smbd_echo_read_state);
2494         struct smbd_server_connection *sconn = state->sconn;
2495         bool ok;
2496         NTSTATUS status;
2497         size_t unread = 0;
2498         bool encrypted;
2499
2500         ok = tevent_wakeup_recv(subreq);
2501         TALLOC_FREE(subreq);
2502         if (!ok) {
2503                 tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
2504                 return;
2505         }
2506
2507         ok = smbd_lock_socket_internal(sconn);
2508         if (!ok) {
2509                 tevent_req_nterror(req, map_nt_error_from_unix(errno));
2510                 DEBUG(0, ("%s: failed to lock socket\n", __location__));
2511                 return;
2512         }
2513
2514         if (!fd_is_readable(sconn->sock)) {
2515                 DEBUG(10,("echo_handler[%d] the parent smbd was faster\n",
2516                           (int)sys_getpid()));
2517
2518                 ok = smbd_unlock_socket_internal(sconn);
2519                 if (!ok) {
2520                         tevent_req_nterror(req, map_nt_error_from_unix(errno));
2521                         DEBUG(1, ("%s: failed to unlock socket\n",
2522                                 __location__));
2523                         return;
2524                 }
2525
2526                 subreq = wait_for_read_send(state, state->ev, sconn->sock);
2527                 if (tevent_req_nomem(subreq, req)) {
2528                         return;
2529                 }
2530                 tevent_req_set_callback(subreq, smbd_echo_read_readable, req);
2531                 return;
2532         }
2533
2534         status = receive_smb_talloc(state, sconn, sconn->sock, &state->buf,
2535                                     0 /* timeout */,
2536                                     &unread,
2537                                     &encrypted,
2538                                     &state->buflen,
2539                                     &state->seqnum,
2540                                     false /* trusted_channel*/);
2541
2542         if (tevent_req_nterror(req, status)) {
2543                 tevent_req_nterror(req, status);
2544                 DEBUG(1, ("echo_handler[%d]: receive_smb_raw_talloc failed: %s\n",
2545                           (int)sys_getpid(), nt_errstr(status)));
2546                 return;
2547         }
2548
2549         ok = smbd_unlock_socket_internal(sconn);
2550         if (!ok) {
2551                 tevent_req_nterror(req, map_nt_error_from_unix(errno));
2552                 DEBUG(1, ("%s: failed to unlock socket\n", __location__));
2553                 return;
2554         }
2555         tevent_req_done(req);
2556 }
2557
2558 static NTSTATUS smbd_echo_read_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
2559                                     char **pbuf, size_t *pbuflen, uint32_t *pseqnum)
2560 {
2561         struct smbd_echo_read_state *state = tevent_req_data(
2562                 req, struct smbd_echo_read_state);
2563         NTSTATUS status;
2564
2565         if (tevent_req_is_nterror(req, &status)) {
2566                 return status;
2567         }
2568         *pbuf = talloc_move(mem_ctx, &state->buf);
2569         *pbuflen = state->buflen;
2570         *pseqnum = state->seqnum;
2571         return NT_STATUS_OK;
2572 }
2573
2574 struct smbd_echo_state {
2575         struct tevent_context *ev;
2576         struct iovec *pending;
2577         struct smbd_server_connection *sconn;
2578         int parent_pipe;
2579
2580         struct tevent_fd *parent_fde;
2581
2582         struct tevent_req *write_req;
2583 };
2584
2585 static void smbd_echo_writer_done(struct tevent_req *req);
2586
2587 static void smbd_echo_activate_writer(struct smbd_echo_state *state)
2588 {
2589         int num_pending;
2590
2591         if (state->write_req != NULL) {
2592                 return;
2593         }
2594
2595         num_pending = talloc_array_length(state->pending);
2596         if (num_pending == 0) {
2597                 return;
2598         }
2599
2600         state->write_req = writev_send(state, state->ev, NULL,
2601                                        state->parent_pipe, false,
2602                                        state->pending, num_pending);
2603         if (state->write_req == NULL) {
2604                 DEBUG(1, ("writev_send failed\n"));
2605                 exit(1);
2606         }
2607
2608         talloc_steal(state->write_req, state->pending);
2609         state->pending = NULL;
2610
2611         tevent_req_set_callback(state->write_req, smbd_echo_writer_done,
2612                                 state);
2613 }
2614
2615 static void smbd_echo_writer_done(struct tevent_req *req)
2616 {
2617         struct smbd_echo_state *state = tevent_req_callback_data(
2618                 req, struct smbd_echo_state);
2619         ssize_t written;
2620         int err;
2621
2622         written = writev_recv(req, &err);
2623         TALLOC_FREE(req);
2624         state->write_req = NULL;
2625         if (written == -1) {
2626                 DEBUG(1, ("writev to parent failed: %s\n", strerror(err)));
2627                 exit(1);
2628         }
2629         DEBUG(10,("echo_handler[%d]: forwarded pdu to main\n", (int)sys_getpid()));
2630         smbd_echo_activate_writer(state);
2631 }
2632
2633 static bool smbd_echo_reply(struct smbd_echo_state *state,
2634                             uint8_t *inbuf, size_t inbuf_len,
2635                             uint32_t seqnum)
2636 {
2637         struct smb_request req;
2638         uint16_t num_replies;
2639         char *outbuf;
2640         bool ok;
2641
2642         if ((inbuf_len == 4) && (CVAL(inbuf, 0) == NBSSkeepalive)) {
2643                 DEBUG(10, ("Got netbios keepalive\n"));
2644                 /*
2645                  * Just swallow it
2646                  */
2647                 return true;
2648         }
2649
2650         if (inbuf_len < smb_size) {
2651                 DEBUG(10, ("Got short packet: %d bytes\n", (int)inbuf_len));
2652                 return false;
2653         }
2654         if (!valid_smb_header(state->sconn, inbuf)) {
2655                 DEBUG(10, ("Got invalid SMB header\n"));
2656                 return false;
2657         }
2658
2659         if (!init_smb_request(&req, state->sconn, inbuf, 0, false,
2660                               seqnum)) {
2661                 return false;
2662         }
2663         req.inbuf = inbuf;
2664
2665         DEBUG(10, ("smbecho handler got cmd %d (%s)\n", (int)req.cmd,
2666                    smb_messages[req.cmd].name
2667                    ? smb_messages[req.cmd].name : "unknown"));
2668
2669         if (req.cmd != SMBecho) {
2670                 return false;
2671         }
2672         if (req.wct < 1) {
2673                 return false;
2674         }
2675
2676         num_replies = SVAL(req.vwv+0, 0);
2677         if (num_replies != 1) {
2678                 /* Not a Windows "Hey, you're still there?" request */
2679                 return false;
2680         }
2681
2682         if (!create_outbuf(talloc_tos(), &req, (const char *)req.inbuf, &outbuf,
2683                            1, req.buflen)) {
2684                 DEBUG(10, ("create_outbuf failed\n"));
2685                 return false;
2686         }
2687         req.outbuf = (uint8_t *)outbuf;
2688
2689         SSVAL(req.outbuf, smb_vwv0, num_replies);
2690
2691         if (req.buflen > 0) {
2692                 memcpy(smb_buf(req.outbuf), req.buf, req.buflen);
2693         }
2694
2695         ok = srv_send_smb(req.sconn,
2696                           (char *)outbuf,
2697                           true, seqnum+1,
2698                           false, &req.pcd);
2699         TALLOC_FREE(outbuf);
2700         if (!ok) {
2701                 exit(1);
2702         }
2703
2704         return true;
2705 }
2706
2707 static void smbd_echo_exit(struct tevent_context *ev,
2708                            struct tevent_fd *fde, uint16_t flags,
2709                            void *private_data)
2710 {
2711         DEBUG(2, ("smbd_echo_exit: lost connection to parent\n"));
2712         exit(0);
2713 }
2714
2715 static void smbd_echo_got_packet(struct tevent_req *req);
2716
2717 static void smbd_echo_loop(struct smbd_server_connection *sconn,
2718                            int parent_pipe)
2719 {
2720         struct smbd_echo_state *state;
2721         struct tevent_req *read_req;
2722
2723         state = talloc_zero(sconn, struct smbd_echo_state);
2724         if (state == NULL) {
2725                 DEBUG(1, ("talloc failed\n"));
2726                 return;
2727         }
2728         state->sconn = sconn;
2729         state->parent_pipe = parent_pipe;
2730         state->ev = s3_tevent_context_init(state);
2731         if (state->ev == NULL) {
2732                 DEBUG(1, ("tevent_context_init failed\n"));
2733                 TALLOC_FREE(state);
2734                 return;
2735         }
2736         state->parent_fde = tevent_add_fd(state->ev, state, parent_pipe,
2737                                         TEVENT_FD_READ, smbd_echo_exit,
2738                                         state);
2739         if (state->parent_fde == NULL) {
2740                 DEBUG(1, ("tevent_add_fd failed\n"));
2741                 TALLOC_FREE(state);
2742                 return;
2743         }
2744
2745         read_req = smbd_echo_read_send(state, state->ev, sconn);
2746         if (read_req == NULL) {
2747                 DEBUG(1, ("smbd_echo_read_send failed\n"));
2748                 TALLOC_FREE(state);
2749                 return;
2750         }
2751         tevent_req_set_callback(read_req, smbd_echo_got_packet, state);
2752
2753         while (true) {
2754                 if (tevent_loop_once(state->ev) == -1) {
2755                         DEBUG(1, ("tevent_loop_once failed: %s\n",
2756                                   strerror(errno)));
2757                         break;
2758                 }
2759         }
2760         TALLOC_FREE(state);
2761 }
2762
2763 static void smbd_echo_got_packet(struct tevent_req *req)
2764 {
2765         struct smbd_echo_state *state = tevent_req_callback_data(
2766                 req, struct smbd_echo_state);
2767         NTSTATUS status;
2768         char *buf = NULL;
2769         size_t buflen = 0;
2770         uint32_t seqnum = 0;
2771         bool reply;
2772
2773         status = smbd_echo_read_recv(req, state, &buf, &buflen, &seqnum);
2774         TALLOC_FREE(req);
2775         if (!NT_STATUS_IS_OK(status)) {
2776                 DEBUG(1, ("smbd_echo_read_recv returned %s\n",
2777                           nt_errstr(status)));
2778                 exit(1);
2779         }
2780
2781         reply = smbd_echo_reply(state, (uint8_t *)buf, buflen, seqnum);
2782         if (!reply) {
2783                 size_t num_pending;
2784                 struct iovec *tmp;
2785                 struct iovec *iov;
2786
2787                 num_pending = talloc_array_length(state->pending);
2788                 tmp = talloc_realloc(state, state->pending, struct iovec,
2789                                      num_pending+1);
2790                 if (tmp == NULL) {
2791                         DEBUG(1, ("talloc_realloc failed\n"));
2792                         exit(1);
2793                 }
2794                 state->pending = tmp;
2795
2796                 if (buflen >= smb_size) {
2797                         /*
2798                          * place the seqnum in the packet so that the main process
2799                          * can reply with signing
2800                          */
2801                         SIVAL(buf, smb_ss_field, seqnum);
2802                         SIVAL(buf, smb_ss_field+4, NT_STATUS_V(NT_STATUS_OK));
2803                 }
2804
2805                 iov = &state->pending[num_pending];
2806                 iov->iov_base = buf;
2807                 iov->iov_len = buflen;
2808
2809                 DEBUG(10,("echo_handler[%d]: forward to main\n",
2810                           (int)sys_getpid()));
2811                 smbd_echo_activate_writer(state);
2812         }
2813
2814         req = smbd_echo_read_send(state, state->ev, state->sconn);
2815         if (req == NULL) {
2816                 DEBUG(1, ("smbd_echo_read_send failed\n"));
2817                 exit(1);
2818         }
2819         tevent_req_set_callback(req, smbd_echo_got_packet, state);
2820 }
2821
2822
2823 /*
2824  * Handle SMBecho requests in a forked child process
2825  */
2826 bool fork_echo_handler(struct smbd_server_connection *sconn)
2827 {
2828         int listener_pipe[2];
2829         int res;
2830         pid_t child;
2831
2832         res = pipe(listener_pipe);
2833         if (res == -1) {
2834                 DEBUG(1, ("pipe() failed: %s\n", strerror(errno)));
2835                 return false;
2836         }
2837         sconn->smb1.echo_handler.socket_lock_fd = create_unlink_tmp(lp_lockdir());
2838         if (sconn->smb1.echo_handler.socket_lock_fd == -1) {
2839                 DEBUG(1, ("Could not create lock fd: %s\n", strerror(errno)));
2840                 goto fail;
2841         }
2842
2843         child = sys_fork();
2844         if (child == 0) {
2845                 NTSTATUS status;
2846
2847                 close(listener_pipe[0]);
2848                 set_blocking(listener_pipe[1], false);
2849
2850                 status = reinit_after_fork(sconn->msg_ctx,
2851                                            sconn->ev_ctx,
2852                                            false);
2853                 if (!NT_STATUS_IS_OK(status)) {
2854                         DEBUG(1, ("reinit_after_fork failed: %s\n",
2855                                   nt_errstr(status)));
2856                         exit(1);
2857                 }
2858                 smbd_echo_loop(sconn, listener_pipe[1]);
2859                 exit(0);
2860         }
2861         close(listener_pipe[1]);
2862         listener_pipe[1] = -1;
2863         sconn->smb1.echo_handler.trusted_fd = listener_pipe[0];
2864
2865         DEBUG(10,("fork_echo_handler: main[%d] echo_child[%d]\n", (int)sys_getpid(), child));
2866
2867         /*
2868          * Without smb signing this is the same as the normal smbd
2869          * listener. This needs to change once signing comes in.
2870          */
2871         sconn->smb1.echo_handler.trusted_fde = tevent_add_fd(sconn->ev_ctx,
2872                                         sconn,
2873                                         sconn->smb1.echo_handler.trusted_fd,
2874                                         TEVENT_FD_READ,
2875                                         smbd_server_echo_handler,
2876                                         sconn);
2877         if (sconn->smb1.echo_handler.trusted_fde == NULL) {
2878                 DEBUG(1, ("event_add_fd failed\n"));
2879                 goto fail;
2880         }
2881
2882         return true;
2883
2884 fail:
2885         if (listener_pipe[0] != -1) {
2886                 close(listener_pipe[0]);
2887         }
2888         if (listener_pipe[1] != -1) {
2889                 close(listener_pipe[1]);
2890         }
2891         sconn->smb1.echo_handler.trusted_fd = -1;
2892         if (sconn->smb1.echo_handler.socket_lock_fd != -1) {
2893                 close(sconn->smb1.echo_handler.socket_lock_fd);
2894         }
2895         sconn->smb1.echo_handler.trusted_fd = -1;
2896         sconn->smb1.echo_handler.socket_lock_fd = -1;
2897         return false;
2898 }
2899
2900 #if CLUSTER_SUPPORT
2901
2902 static NTSTATUS smbd_register_ips(struct smbd_server_connection *sconn,
2903                                   struct sockaddr_storage *srv,
2904                                   struct sockaddr_storage *clnt)
2905 {
2906         struct ctdbd_connection *cconn;
2907         char tmp_addr[INET6_ADDRSTRLEN];
2908         char *addr;
2909
2910         cconn = messaging_ctdbd_connection();
2911         if (cconn == NULL) {
2912                 return NT_STATUS_NO_MEMORY;
2913         }
2914
2915         client_socket_addr(sconn->sock, tmp_addr, sizeof(tmp_addr));
2916         addr = talloc_strdup(cconn, tmp_addr);
2917         if (addr == NULL) {
2918                 return NT_STATUS_NO_MEMORY;
2919         }
2920         return ctdbd_register_ips(cconn, srv, clnt, release_ip, addr);
2921 }
2922
2923 #endif
2924
2925 static bool uid_in_use(const struct user_struct *user, uid_t uid)
2926 {
2927         while (user) {
2928                 if (user->session_info &&
2929                     (user->session_info->unix_token->uid == uid)) {
2930                         return true;
2931                 }
2932                 user = user->next;
2933         }
2934         return false;
2935 }
2936
2937 static bool gid_in_use(const struct user_struct *user, gid_t gid)
2938 {
2939         while (user) {
2940                 if (user->session_info != NULL) {
2941                         int i;
2942                         struct security_unix_token *utok;
2943
2944                         utok = user->session_info->unix_token;
2945                         if (utok->gid == gid) {
2946                                 return true;
2947                         }
2948                         for(i=0; i<utok->ngroups; i++) {
2949                                 if (utok->groups[i] == gid) {
2950                                         return true;
2951                                 }
2952                         }
2953                 }
2954                 user = user->next;
2955         }
2956         return false;
2957 }
2958
2959 static bool sid_in_use(const struct user_struct *user,
2960                        const struct dom_sid *psid)
2961 {
2962         while (user) {
2963                 struct security_token *tok;
2964
2965                 if (user->session_info == NULL) {
2966                         continue;
2967                 }
2968                 tok = user->session_info->security_token;
2969                 if (tok == NULL) {
2970                         /*
2971                          * Not sure session_info->security_token can
2972                          * ever be NULL. This check might be not
2973                          * necessary.
2974                          */
2975                         continue;
2976                 }
2977                 if (security_token_has_sid(tok, psid)) {
2978                         return true;
2979                 }
2980                 user = user->next;
2981         }
2982         return false;
2983 }
2984
2985 static bool id_in_use(const struct user_struct *user,
2986                       const struct id_cache_ref *id)
2987 {
2988         switch(id->type) {
2989         case UID:
2990                 return uid_in_use(user, id->id.uid);
2991         case GID:
2992                 return gid_in_use(user, id->id.gid);
2993         case SID:
2994                 return sid_in_use(user, &id->id.sid);
2995         default:
2996                 break;
2997         }
2998         return false;
2999 }
3000
3001 static void smbd_id_cache_kill(struct messaging_context *msg_ctx,
3002                                void *private_data,
3003                                uint32_t msg_type,
3004                                struct server_id server_id,
3005                                DATA_BLOB* data)
3006 {
3007         const char *msg = (data && data->data)
3008                 ? (const char *)data->data : "<NULL>";
3009         struct user_struct *validated_users;
3010         struct id_cache_ref id;
3011         struct smbd_server_connection *sconn =
3012                 talloc_get_type_abort(private_data,
3013                 struct smbd_server_connection);
3014
3015         validated_users = sconn->smb1.sessions.validated_users;
3016
3017         if (!id_cache_ref_parse(msg, &id)) {
3018                 DEBUG(0, ("Invalid ?ID: %s\n", msg));
3019                 return;
3020         }
3021
3022         if (id_in_use(validated_users, &id)) {
3023                 exit_server_cleanly(msg);
3024         }
3025         id_cache_delete_from_cache(&id);
3026 }
3027
3028 /****************************************************************************
3029  Process commands from the client
3030 ****************************************************************************/
3031
3032 void smbd_process(struct tevent_context *ev_ctx,
3033                   struct smbd_server_connection *sconn)
3034 {
3035         TALLOC_CTX *frame = talloc_stackframe();
3036         struct sockaddr_storage ss;
3037         struct sockaddr *sa = NULL;
3038         socklen_t sa_socklen;
3039         struct tsocket_address *local_address = NULL;
3040         struct tsocket_address *remote_address = NULL;
3041         const char *locaddr = NULL;
3042         const char *remaddr = NULL;
3043         char *rhost;
3044         int ret;
3045
3046         if (lp_maxprotocol() >= PROTOCOL_SMB2_02) {
3047                 /*
3048                  * We're not making the decision here,
3049                  * we're just allowing the client
3050                  * to decide between SMB1 and SMB2
3051                  * with the first negprot
3052                  * packet.
3053                  */
3054                 sconn->using_smb2 = true;
3055         }
3056
3057         /* Ensure child is set to blocking mode */
3058         set_blocking(sconn->sock,True);
3059
3060         set_socket_options(sconn->sock, "SO_KEEPALIVE");
3061         set_socket_options(sconn->sock, lp_socket_options());
3062
3063         sa = (struct sockaddr *)(void *)&ss;
3064         sa_socklen = sizeof(ss);
3065         ret = getpeername(sconn->sock, sa, &sa_socklen);
3066         if (ret != 0) {
3067                 int level = (errno == ENOTCONN)?2:0;
3068                 DEBUG(level,("getpeername() failed - %s\n", strerror(errno)));
3069                 exit_server_cleanly("getpeername() failed.\n");
3070         }
3071         ret = tsocket_address_bsd_from_sockaddr(sconn,
3072                                                 sa, sa_socklen,
3073                                                 &remote_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         sa = (struct sockaddr *)(void *)&ss;
3081         sa_socklen = sizeof(ss);
3082         ret = getsockname(sconn->sock, sa, &sa_socklen);
3083         if (ret != 0) {
3084                 int level = (errno == ENOTCONN)?2:0;
3085                 DEBUG(level,("getsockname() failed - %s\n", strerror(errno)));
3086                 exit_server_cleanly("getsockname() failed.\n");
3087         }
3088         ret = tsocket_address_bsd_from_sockaddr(sconn,
3089                                                 sa, sa_socklen,
3090                                                 &local_address);
3091         if (ret != 0) {
3092                 DEBUG(0,("%s: tsocket_address_bsd_from_sockaddr remote failed - %s\n",
3093                         __location__, strerror(errno)));
3094                 exit_server_cleanly("tsocket_address_bsd_from_sockaddr remote failed.\n");
3095         }
3096
3097         sconn->local_address = local_address;
3098         sconn->remote_address = remote_address;
3099
3100         if (tsocket_address_is_inet(local_address, "ip")) {
3101                 locaddr = tsocket_address_inet_addr_string(
3102                                 sconn->local_address,
3103                                 talloc_tos());
3104                 if (locaddr == NULL) {
3105                         DEBUG(0,("%s: tsocket_address_inet_addr_string local failed - %s\n",
3106                                  __location__, strerror(errno)));
3107                         exit_server_cleanly("tsocket_address_inet_addr_string local failed.\n");
3108                 }
3109         } else {
3110                 locaddr = "0.0.0.0";
3111         }
3112
3113         if (tsocket_address_is_inet(remote_address, "ip")) {
3114                 remaddr = tsocket_address_inet_addr_string(
3115                                 sconn->remote_address,
3116                                 talloc_tos());
3117                 if (remaddr == NULL) {
3118                         DEBUG(0,("%s: tsocket_address_inet_addr_string remote failed - %s\n",
3119                                  __location__, strerror(errno)));
3120                         exit_server_cleanly("tsocket_address_inet_addr_string remote failed.\n");
3121                 }
3122         } else {
3123                 remaddr = "0.0.0.0";
3124         }
3125
3126         /* this is needed so that we get decent entries
3127            in smbstatus for port 445 connects */
3128         set_remote_machine_name(remaddr, false);
3129         reload_services(sconn, conn_snum_used, true);
3130
3131         /*
3132          * Before the first packet, check the global hosts allow/ hosts deny
3133          * parameters before doing any parsing of packets passed to us by the
3134          * client. This prevents attacks on our parsing code from hosts not in
3135          * the hosts allow list.
3136          */
3137
3138         ret = get_remote_hostname(remote_address,
3139                                   &rhost,
3140                                   talloc_tos());
3141         if (ret < 0) {
3142                 DEBUG(0,("%s: get_remote_hostname failed - %s\n",
3143                         __location__, strerror(errno)));
3144                 exit_server_cleanly("get_remote_hostname failed.\n");
3145         }
3146         if (strequal(rhost, "UNKNOWN")) {
3147                 rhost = talloc_strdup(talloc_tos(), remaddr);
3148         }
3149         sconn->remote_hostname = talloc_move(sconn, &rhost);
3150
3151         sub_set_socket_ids(remaddr,
3152                            sconn->remote_hostname,
3153                            locaddr);
3154
3155         if (!allow_access(lp_hostsdeny(-1), lp_hostsallow(-1),
3156                           sconn->remote_hostname,
3157                           remaddr)) {
3158                 /*
3159                  * send a negative session response "not listening on calling
3160                  * name"
3161                  */
3162                 unsigned char buf[5] = {0x83, 0, 0, 1, 0x81};
3163                 DEBUG( 1, ("Connection denied from %s to %s\n",
3164                            tsocket_address_string(remote_address, talloc_tos()),
3165                            tsocket_address_string(local_address, talloc_tos())));
3166                 (void)srv_send_smb(sconn,(char *)buf, false,
3167                                    0, false, NULL);
3168                 exit_server_cleanly("connection denied");
3169         }
3170
3171         DEBUG(10, ("Connection allowed from %s to %s\n",
3172                    tsocket_address_string(remote_address, talloc_tos()),
3173                    tsocket_address_string(local_address, talloc_tos())));
3174
3175         init_modules();
3176
3177         smb_perfcount_init();
3178
3179         if (!init_account_policy()) {
3180                 exit_server("Could not open account policy tdb.\n");
3181         }
3182
3183         if (*lp_rootdir()) {
3184                 if (chroot(lp_rootdir()) != 0) {
3185                         DEBUG(0,("Failed to change root to %s\n", lp_rootdir()));
3186                         exit_server("Failed to chroot()");
3187                 }
3188                 if (chdir("/") == -1) {
3189                         DEBUG(0,("Failed to chdir to / on chroot to %s\n", lp_rootdir()));
3190                         exit_server("Failed to chroot()");
3191                 }
3192                 DEBUG(0,("Changed root to %s\n", lp_rootdir()));
3193         }
3194
3195         if (!srv_init_signing(sconn)) {
3196                 exit_server("Failed to init smb_signing");
3197         }
3198
3199         /* Setup oplocks */
3200         if (!init_oplocks(sconn))
3201                 exit_server("Failed to init oplocks");
3202
3203         /* register our message handlers */
3204         messaging_register(sconn->msg_ctx, sconn,
3205                            MSG_SMB_FORCE_TDIS, msg_force_tdis);
3206         messaging_register(sconn->msg_ctx, sconn,
3207                            MSG_SMB_CLOSE_FILE, msg_close_file);
3208         messaging_register(sconn->msg_ctx, sconn,
3209                            MSG_SMB_FILE_RENAME, msg_file_was_renamed);
3210
3211         id_cache_register_msgs(sconn->msg_ctx);
3212         messaging_deregister(sconn->msg_ctx, ID_CACHE_KILL, NULL);
3213         messaging_register(sconn->msg_ctx, sconn,
3214                            ID_CACHE_KILL, smbd_id_cache_kill);
3215
3216         messaging_deregister(sconn->msg_ctx,
3217                              MSG_SMB_CONF_UPDATED, sconn->ev_ctx);
3218         messaging_register(sconn->msg_ctx, sconn,
3219                            MSG_SMB_CONF_UPDATED, smbd_conf_updated);
3220
3221         /*
3222          * Use the default MSG_DEBUG handler to avoid rebroadcasting
3223          * MSGs to all child processes
3224          */
3225         messaging_deregister(sconn->msg_ctx,
3226                              MSG_DEBUG, NULL);
3227         messaging_register(sconn->msg_ctx, NULL,
3228                            MSG_DEBUG, debug_message);
3229
3230         if ((lp_keepalive() != 0)
3231             && !(event_add_idle(ev_ctx, NULL,
3232                                 timeval_set(lp_keepalive(), 0),
3233                                 "keepalive", keepalive_fn,
3234                                 sconn))) {
3235                 DEBUG(0, ("Could not add keepalive event\n"));
3236                 exit(1);
3237         }
3238
3239         if (!(event_add_idle(ev_ctx, NULL,
3240                              timeval_set(IDLE_CLOSED_TIMEOUT, 0),
3241                              "deadtime", deadtime_fn, sconn))) {
3242                 DEBUG(0, ("Could not add deadtime event\n"));
3243                 exit(1);
3244         }
3245
3246         if (!(event_add_idle(ev_ctx, NULL,
3247                              timeval_set(SMBD_HOUSEKEEPING_INTERVAL, 0),
3248                              "housekeeping", housekeeping_fn, sconn))) {
3249                 DEBUG(0, ("Could not add housekeeping event\n"));
3250                 exit(1);
3251         }
3252
3253 #ifdef CLUSTER_SUPPORT
3254
3255         if (lp_clustering()) {
3256                 /*
3257                  * We need to tell ctdb about our client's TCP
3258                  * connection, so that for failover ctdbd can send
3259                  * tickle acks, triggering a reconnection by the
3260                  * client.
3261                  */
3262
3263                 struct sockaddr_storage srv, clnt;
3264
3265                 if (client_get_tcp_info(sconn->sock, &srv, &clnt) == 0) {
3266                         NTSTATUS status;
3267                         status = smbd_register_ips(sconn, &srv, &clnt);
3268                         if (!NT_STATUS_IS_OK(status)) {
3269                                 DEBUG(0, ("ctdbd_register_ips failed: %s\n",
3270                                           nt_errstr(status)));
3271                         }
3272                 } else
3273                 {
3274                         DEBUG(0,("Unable to get tcp info for "
3275                                  "CTDB_CONTROL_TCP_CLIENT: %s\n",
3276                                  strerror(errno)));
3277                 }
3278         }
3279
3280 #endif
3281
3282         sconn->nbt.got_session = false;
3283
3284         sconn->smb1.negprot.max_recv = MIN(lp_maxxmit(),BUFFER_SIZE);
3285
3286         sconn->smb1.sessions.done_sesssetup = false;
3287         sconn->smb1.sessions.max_send = BUFFER_SIZE;
3288         sconn->smb1.sessions.last_session_tag = UID_FIELD_INVALID;
3289         /* users from session setup */
3290         sconn->smb1.sessions.session_userlist = NULL;
3291         /* workgroup from session setup. */
3292         sconn->smb1.sessions.session_workgroup = NULL;
3293         /* this holds info on user ids that are already validated for this VC */
3294         sconn->smb1.sessions.validated_users = NULL;
3295         sconn->smb1.sessions.next_vuid = VUID_OFFSET;
3296         sconn->smb1.sessions.num_validated_vuids = 0;
3297
3298         conn_init(sconn);
3299         if (!init_dptrs(sconn)) {
3300                 exit_server("init_dptrs() failed");
3301         }
3302
3303         sconn->smb1.fde = event_add_fd(ev_ctx,
3304                                                   sconn,
3305                                                   sconn->sock,
3306                                                   EVENT_FD_READ,
3307                                                   smbd_server_connection_handler,
3308                                                   sconn);
3309         if (!sconn->smb1.fde) {
3310                 exit_server("failed to create smbd_server_connection fde");
3311         }
3312
3313         TALLOC_FREE(frame);
3314
3315         while (True) {
3316                 frame = talloc_stackframe_pool(8192);
3317
3318                 errno = 0;
3319                 if (tevent_loop_once(ev_ctx) == -1) {
3320                         if (errno != EINTR) {
3321                                 DEBUG(3, ("tevent_loop_once failed: %s,"
3322                                           " exiting\n", strerror(errno) ));
3323                                 break;
3324                         }
3325                 }
3326
3327                 TALLOC_FREE(frame);
3328         }
3329
3330         exit_server_cleanly(NULL);
3331 }
3332
3333 bool req_is_in_chain(struct smb_request *req)
3334 {
3335         if (req->vwv != (const uint16_t *)(req->inbuf+smb_vwv)) {
3336                 /*
3337                  * We're right now handling a subsequent request, so we must
3338                  * be in a chain
3339                  */
3340                 return true;
3341         }
3342
3343         if (!is_andx_req(req->cmd)) {
3344                 return false;
3345         }
3346
3347         if (req->wct < 2) {
3348                 /*
3349                  * Okay, an illegal request, but definitely not chained :-)
3350                  */
3351                 return false;
3352         }
3353
3354         return (CVAL(req->vwv+0, 0) != 0xFF);
3355 }