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 "lib/messages_ctdb.h"
  36 #include "smbprofile.h"
  37 #include "rpc_server/spoolss/srv_spoolss_nt.h"
  38 #include "libsmb/libsmb.h"
  39 #include "../lib/util/tevent_ntstatus.h"
  40 #include "../libcli/security/dom_sid.h"
  41 #include "../libcli/security/security_token.h"
  42 #include "lib/id_cache.h"
  43 #include "lib/util/sys_rw_data.h"
  44 #include "serverid.h"
  45 #include "system/threads.h"
  46
  47 /* Internal message queue for deferred opens. */
  48 struct pending_message_list {
  49         struct pending_message_list *next, *prev;
  50         struct timeval request_time; /* When was this first issued? */
  51         struct smbd_server_connection *sconn;
  52         struct smbXsrv_connection *xconn;
  53         struct tevent_timer *te;
  54         struct smb_perfcount_data pcd;
  55         uint32_t seqnum;
  56         bool encrypted;
  57         bool processed;
  58         DATA_BLOB buf;
  59         struct deferred_open_record *open_rec;
  60 };
  61
  62 static void construct_reply_common(uint8_t cmd, const uint8_t *inbuf,
  63                                    char *outbuf);
  64 static struct pending_message_list *get_deferred_open_message_smb(
  65         struct smbd_server_connection *sconn, uint64_t mid);
  66 static bool smb_splice_chain(uint8_t **poutbuf, const uint8_t *andx_buf);
  67
  68 static void smbd_echo_init(struct smbXsrv_connection *xconn)
  69 {
  70         xconn->smb1.echo_handler.trusted_fd = -1;
  71         xconn->smb1.echo_handler.socket_lock_fd = -1;
  72 #ifdef HAVE_ROBUST_MUTEXES
  73         xconn->smb1.echo_handler.socket_mutex = NULL;
  74 #endif
  75 }
  76
  77 static bool smbd_echo_active(struct smbXsrv_connection *xconn)
  78 {
  79         if (xconn->smb1.echo_handler.socket_lock_fd != -1) {
  80                 return true;
  81         }
  82
  83 #ifdef HAVE_ROBUST_MUTEXES
  84         if (xconn->smb1.echo_handler.socket_mutex != NULL) {
  85                 return true;
  86         }
  87 #endif
  88
  89         return false;
  90 }
  91
  92 static bool smbd_lock_socket_internal(struct smbXsrv_connection *xconn)
  93 {
  94         if (!smbd_echo_active(xconn)) {
  95                 return true;
  96         }
  97
  98         xconn->smb1.echo_handler.ref_count++;
  99
 100         if (xconn->smb1.echo_handler.ref_count > 1) {
 101                 return true;
 102         }
 103
 104         DEBUG(10,("pid[%d] wait for socket lock\n", (int)getpid()));
 105
 106 #ifdef HAVE_ROBUST_MUTEXES
 107         if (xconn->smb1.echo_handler.socket_mutex != NULL) {
 108                 int ret = EINTR;
 109
 110                 while (ret == EINTR) {
 111                         ret = pthread_mutex_lock(
 112                                 xconn->smb1.echo_handler.socket_mutex);
 113                         if (ret == 0) {
 114                                 break;
 115                         }
 116                 }
 117                 if (ret != 0) {
 118                         DEBUG(1, ("pthread_mutex_lock failed: %s\n",
 119                                   strerror(ret)));
 120                         return false;
 121                 }
 122         }
 123 #endif
 124
 125         if (xconn->smb1.echo_handler.socket_lock_fd != -1) {
 126                 bool ok;
 127
 128                 do {
 129                         ok = fcntl_lock(
 130                                 xconn->smb1.echo_handler.socket_lock_fd,
 131                                 F_SETLKW, 0, 0, F_WRLCK);
 132                 } while (!ok && (errno == EINTR));
 133
 134                 if (!ok) {
 135                         DEBUG(1, ("fcntl_lock failed: %s\n", strerror(errno)));
 136                         return false;
 137                 }
 138         }
 139
 140         DEBUG(10,("pid[%d] got socket lock\n", (int)getpid()));
 141
 142         return true;
 143 }
 144
 145 void smbd_lock_socket(struct smbXsrv_connection *xconn)
 146 {
 147         if (!smbd_lock_socket_internal(xconn)) {
 148                 exit_server_cleanly("failed to lock socket");
 149         }
 150 }
 151
 152 static bool smbd_unlock_socket_internal(struct smbXsrv_connection *xconn)
 153 {
 154         if (!smbd_echo_active(xconn)) {
 155                 return true;
 156         }
 157
 158         xconn->smb1.echo_handler.ref_count--;
 159
 160         if (xconn->smb1.echo_handler.ref_count > 0) {
 161                 return true;
 162         }
 163
 164 #ifdef HAVE_ROBUST_MUTEXES
 165         if (xconn->smb1.echo_handler.socket_mutex != NULL) {
 166                 int ret = EINTR;
 167
 168                 while (ret == EINTR) {
 169                         ret = pthread_mutex_unlock(
 170                                 xconn->smb1.echo_handler.socket_mutex);
 171                         if (ret == 0) {
 172                                 break;
 173                         }
 174                 }
 175                 if (ret != 0) {
 176                         DEBUG(1, ("pthread_mutex_unlock failed: %s\n",
 177                                   strerror(ret)));
 178                         return false;
 179                 }
 180         }
 181 #endif
 182
 183         if (xconn->smb1.echo_handler.socket_lock_fd != -1) {
 184                 bool ok;
 185
 186                 do {
 187                         ok = fcntl_lock(
 188                                 xconn->smb1.echo_handler.socket_lock_fd,
 189                                 F_SETLKW, 0, 0, F_UNLCK);
 190                 } while (!ok && (errno == EINTR));
 191
 192                 if (!ok) {
 193                         DEBUG(1, ("fcntl_lock failed: %s\n", strerror(errno)));
 194                         return false;
 195                 }
 196         }
 197
 198         DEBUG(10,("pid[%d] unlocked socket\n", (int)getpid()));
 199
 200         return true;
 201 }
 202
 203 void smbd_unlock_socket(struct smbXsrv_connection *xconn)
 204 {
 205         if (!smbd_unlock_socket_internal(xconn)) {
 206                 exit_server_cleanly("failed to unlock socket");
 207         }
 208 }
 209
 210 /* Accessor function for smb_read_error for smbd functions. */
 211
 212 /****************************************************************************
 213  Send an smb to a fd.
 214 ****************************************************************************/
 215
 216 bool srv_send_smb(struct smbXsrv_connection *xconn, char *buffer,
 217                   bool do_signing, uint32_t seqnum,
 218                   bool do_encrypt,
 219                   struct smb_perfcount_data *pcd)
 220 {
 221         size_t len = 0;
 222         ssize_t ret;
 223         char *buf_out = buffer;
 224
 225         if (!NT_STATUS_IS_OK(xconn->transport.status)) {
 226                 /*
 227                  * we're not supposed to do any io
 228                  */
 229                 return true;
 230         }
 231
 232         smbd_lock_socket(xconn);
 233
 234         if (do_signing) {
 235                 /* Sign the outgoing packet if required. */
 236                 srv_calculate_sign_mac(xconn, buf_out, seqnum);
 237         }
 238
 239         if (do_encrypt) {
 240                 NTSTATUS status = srv_encrypt_buffer(xconn, buffer, &buf_out);
 241                 if (!NT_STATUS_IS_OK(status)) {
 242                         DEBUG(0, ("send_smb: SMB encryption failed "
 243                                 "on outgoing packet! Error %s\n",
 244                                 nt_errstr(status) ));
 245                         ret = -1;
 246                         goto out;
 247                 }
 248         }
 249
 250         len = smb_len_large(buf_out) + 4;
 251
 252         ret = write_data(xconn->transport.sock, buf_out, len);
 253         if (ret <= 0) {
 254                 int saved_errno = errno;
 255                 /*
 256                  * Try and give an error message saying what
 257                  * client failed.
 258                  */
 259                 DEBUG(1,("pid[%d] Error writing %d bytes to client %s. %d. (%s)\n",
 260                          (int)getpid(), (int)len,
 261                          smbXsrv_connection_dbg(xconn),
 262                          (int)ret, strerror(saved_errno)));
 263                 errno = saved_errno;
 264
 265                 srv_free_enc_buffer(xconn, buf_out);
 266                 goto out;
 267         }
 268
 269         SMB_PERFCOUNT_SET_MSGLEN_OUT(pcd, len);
 270         srv_free_enc_buffer(xconn, buf_out);
 271 out:
 272         SMB_PERFCOUNT_END(pcd);
 273
 274         smbd_unlock_socket(xconn);
 275         return (ret > 0);
 276 }
 277
 278 /*******************************************************************
 279  Setup the word count and byte count for a smb message.
 280 ********************************************************************/
 281
 282 int srv_set_message(char *buf,
 283                         int num_words,
 284                         int num_bytes,
 285                         bool zero)
 286 {
 287         if (zero && (num_words || num_bytes)) {
 288                 memset(buf + smb_size,'\0',num_words*2 + num_bytes);
 289         }
 290         SCVAL(buf,smb_wct,num_words);
 291         SSVAL(buf,smb_vwv + num_words*SIZEOFWORD,num_bytes);
 292         smb_setlen(buf,(smb_size + num_words*2 + num_bytes - 4));
 293         return (smb_size + num_words*2 + num_bytes);
 294 }
 295
 296 static bool valid_smb_header(const uint8_t *inbuf)
 297 {
 298         if (is_encrypted_packet(inbuf)) {
 299                 return true;
 300         }
 301         /*
 302          * This used to be (strncmp(smb_base(inbuf),"\377SMB",4) == 0)
 303          * but it just looks weird to call strncmp for this one.
 304          */
 305         return (IVAL(smb_base(inbuf), 0) == 0x424D53FF);
 306 }
 307
 308 /* Socket functions for smbd packet processing. */
 309
 310 static bool valid_packet_size(size_t len)
 311 {
 312         /*
 313          * A WRITEX with CAP_LARGE_WRITEX can be 64k worth of data plus 65 bytes
 314          * of header. Don't print the error if this fits.... JRA.
 315          */
 316
 317         if (len > (LARGE_WRITEX_BUFFER_SIZE + LARGE_WRITEX_HDR_SIZE)) {
 318                 DEBUG(0,("Invalid packet length! (%lu bytes).\n",
 319                                         (unsigned long)len));
 320                 return false;
 321         }
 322         return true;
 323 }
 324
 325 static NTSTATUS read_packet_remainder(int fd, char *buffer,
 326                                       unsigned int timeout, ssize_t len)
 327 {
 328         NTSTATUS status;
 329
 330         if (len <= 0) {
 331                 return NT_STATUS_OK;
 332         }
 333
 334         status = read_fd_with_timeout(fd, buffer, len, len, timeout, NULL);
 335         if (!NT_STATUS_IS_OK(status)) {
 336                 char addr[INET6_ADDRSTRLEN];
 337                 DEBUG(0, ("read_fd_with_timeout failed for client %s read "
 338                           "error = %s.\n",
 339                           get_peer_addr(fd, addr, sizeof(addr)),
 340                           nt_errstr(status)));
 341         }
 342         return status;
 343 }
 344
 345 /****************************************************************************
 346  Attempt a zerocopy writeX read. We know here that len > smb_size-4
 347 ****************************************************************************/
 348
 349 /*
 350  * Unfortunately, earlier versions of smbclient/libsmbclient
 351  * don't send this "standard" writeX header. I've fixed this
 352  * for 3.2 but we'll use the old method with earlier versions.
 353  * Windows and CIFSFS at least use this standard size. Not
 354  * sure about MacOSX.
 355  */
 356
 357 #define STANDARD_WRITE_AND_X_HEADER_SIZE (smb_size - 4 + /* basic header */ \
 358                                 (2*14) + /* word count (including bcc) */ \
 359                                 1 /* pad byte */)
 360
 361 static NTSTATUS receive_smb_raw_talloc_partial_read(TALLOC_CTX *mem_ctx,
 362                                                     const char lenbuf[4],
 363                                                     struct smbXsrv_connection *xconn,
 364                                                     int sock,
 365                                                     char **buffer,
 366                                                     unsigned int timeout,
 367                                                     size_t *p_unread,
 368                                                     size_t *len_ret)
 369 {
 370         /* Size of a WRITEX call (+4 byte len). */
 371         char writeX_header[4 + STANDARD_WRITE_AND_X_HEADER_SIZE];
 372         ssize_t len = smb_len_large(lenbuf); /* Could be a UNIX large writeX. */
 373         ssize_t toread;
 374         NTSTATUS status;
 375
 376         memcpy(writeX_header, lenbuf, 4);
 377
 378         status = read_fd_with_timeout(
 379                 sock, writeX_header + 4,
 380                 STANDARD_WRITE_AND_X_HEADER_SIZE,
 381                 STANDARD_WRITE_AND_X_HEADER_SIZE,
 382                 timeout, NULL);
 383
 384         if (!NT_STATUS_IS_OK(status)) {
 385                 DEBUG(0, ("read_fd_with_timeout failed for client %s read "
 386                           "error = %s.\n",
 387                           smbXsrv_connection_dbg(xconn),
 388                           nt_errstr(status)));
 389                 return status;
 390         }
 391
 392         /*
 393          * Ok - now try and see if this is a possible
 394          * valid writeX call.
 395          */
 396
 397         if (is_valid_writeX_buffer(xconn, (uint8_t *)writeX_header)) {
 398                 /*
 399                  * If the data offset is beyond what
 400                  * we've read, drain the extra bytes.
 401                  */
 402                 uint16_t doff = SVAL(writeX_header,smb_vwv11);
 403                 ssize_t newlen;
 404
 405                 if (doff > STANDARD_WRITE_AND_X_HEADER_SIZE) {
 406                         size_t drain = doff - STANDARD_WRITE_AND_X_HEADER_SIZE;
 407                         if (drain_socket(sock, drain) != drain) {
 408                                 smb_panic("receive_smb_raw_talloc_partial_read:"
 409                                         " failed to drain pending bytes");
 410                         }
 411                 } else {
 412                         doff = STANDARD_WRITE_AND_X_HEADER_SIZE;
 413                 }
 414
 415                 /* Spoof down the length and null out the bcc. */
 416                 set_message_bcc(writeX_header, 0);
 417                 newlen = smb_len(writeX_header);
 418
 419                 /* Copy the header we've written. */
 420
 421                 *buffer = (char *)talloc_memdup(mem_ctx,
 422                                 writeX_header,
 423                                 sizeof(writeX_header));
 424
 425                 if (*buffer == NULL) {
 426                         DEBUG(0, ("Could not allocate inbuf of length %d\n",
 427                                   (int)sizeof(writeX_header)));
 428                         return NT_STATUS_NO_MEMORY;
 429                 }
 430
 431                 /* Work out the remaining bytes. */
 432                 *p_unread = len - STANDARD_WRITE_AND_X_HEADER_SIZE;
 433                 *len_ret = newlen + 4;
 434                 return NT_STATUS_OK;
 435         }
 436
 437         if (!valid_packet_size(len)) {
 438                 return NT_STATUS_INVALID_PARAMETER;
 439         }
 440
 441         /*
 442          * Not a valid writeX call. Just do the standard
 443          * talloc and return.
 444          */
 445
 446         *buffer = talloc_array(mem_ctx, char, len+4);
 447
 448         if (*buffer == NULL) {
 449                 DEBUG(0, ("Could not allocate inbuf of length %d\n",
 450                           (int)len+4));
 451                 return NT_STATUS_NO_MEMORY;
 452         }
 453
 454         /* Copy in what we already read. */
 455         memcpy(*buffer,
 456                 writeX_header,
 457                 4 + STANDARD_WRITE_AND_X_HEADER_SIZE);
 458         toread = len - STANDARD_WRITE_AND_X_HEADER_SIZE;
 459
 460         if(toread > 0) {
 461                 status = read_packet_remainder(
 462                         sock,
 463                         (*buffer) + 4 + STANDARD_WRITE_AND_X_HEADER_SIZE,
 464                         timeout, toread);
 465
 466                 if (!NT_STATUS_IS_OK(status)) {
 467                         DEBUG(10, ("receive_smb_raw_talloc_partial_read: %s\n",
 468                                    nt_errstr(status)));
 469                         return status;
 470                 }
 471         }
 472
 473         *len_ret = len + 4;
 474         return NT_STATUS_OK;
 475 }
 476
 477 static NTSTATUS receive_smb_raw_talloc(TALLOC_CTX *mem_ctx,
 478                                        struct smbXsrv_connection *xconn,
 479                                        int sock,
 480                                        char **buffer, unsigned int timeout,
 481                                        size_t *p_unread, size_t *plen)
 482 {
 483         char lenbuf[4];
 484         size_t len;
 485         int min_recv_size = lp_min_receive_file_size();
 486         NTSTATUS status;
 487
 488         *p_unread = 0;
 489
 490         status = read_smb_length_return_keepalive(sock, lenbuf, timeout,
 491                                                   &len);
 492         if (!NT_STATUS_IS_OK(status)) {
 493                 return status;
 494         }
 495
 496         if (CVAL(lenbuf,0) == 0 && min_recv_size &&
 497             (smb_len_large(lenbuf) > /* Could be a UNIX large writeX. */
 498                 (min_recv_size + STANDARD_WRITE_AND_X_HEADER_SIZE)) &&
 499             !srv_is_signing_active(xconn) &&
 500             xconn->smb1.echo_handler.trusted_fde == NULL) {
 501
 502                 return receive_smb_raw_talloc_partial_read(
 503                         mem_ctx, lenbuf, xconn, sock, buffer, timeout,
 504                         p_unread, plen);
 505         }
 506
 507         if (!valid_packet_size(len)) {
 508                 return NT_STATUS_INVALID_PARAMETER;
 509         }
 510
 511         /*
 512          * The +4 here can't wrap, we've checked the length above already.
 513          */
 514
 515         *buffer = talloc_array(mem_ctx, char, len+4);
 516
 517         if (*buffer == NULL) {
 518                 DEBUG(0, ("Could not allocate inbuf of length %d\n",
 519                           (int)len+4));
 520                 return NT_STATUS_NO_MEMORY;
 521         }
 522
 523         memcpy(*buffer, lenbuf, sizeof(lenbuf));
 524
 525         status = read_packet_remainder(sock, (*buffer)+4, timeout, len);
 526         if (!NT_STATUS_IS_OK(status)) {
 527                 return status;
 528         }
 529
 530         *plen = len + 4;
 531         return NT_STATUS_OK;
 532 }
 533
 534 static NTSTATUS receive_smb_talloc(TALLOC_CTX *mem_ctx,
 535                                    struct smbXsrv_connection *xconn,
 536                                    int sock,
 537                                    char **buffer, unsigned int timeout,
 538                                    size_t *p_unread, bool *p_encrypted,
 539                                    size_t *p_len,
 540                                    uint32_t *seqnum,
 541                                    bool trusted_channel)
 542 {
 543         size_t len = 0;
 544         NTSTATUS status;
 545
 546         *p_encrypted = false;
 547
 548         status = receive_smb_raw_talloc(mem_ctx, xconn, sock, buffer, timeout,
 549                                         p_unread, &len);
 550         if (!NT_STATUS_IS_OK(status)) {
 551                 DEBUG(NT_STATUS_EQUAL(status, NT_STATUS_END_OF_FILE)?5:1,
 552                       ("receive_smb_raw_talloc failed for client %s "
 553                        "read error = %s.\n",
 554                        smbXsrv_connection_dbg(xconn),
 555                        nt_errstr(status)) );
 556                 return status;
 557         }
 558
 559         if (is_encrypted_packet((uint8_t *)*buffer)) {
 560                 status = srv_decrypt_buffer(xconn, *buffer);
 561                 if (!NT_STATUS_IS_OK(status)) {
 562                         DEBUG(0, ("receive_smb_talloc: SMB decryption failed on "
 563                                 "incoming packet! Error %s\n",
 564                                 nt_errstr(status) ));
 565                         return status;
 566                 }
 567                 *p_encrypted = true;
 568         }
 569
 570         /* Check the incoming SMB signature. */
 571         if (!srv_check_sign_mac(xconn, *buffer, seqnum, trusted_channel)) {
 572                 DEBUG(0, ("receive_smb: SMB Signature verification failed on "
 573                           "incoming packet!\n"));
 574                 return NT_STATUS_INVALID_NETWORK_RESPONSE;
 575         }
 576
 577         *p_len = len;
 578         return NT_STATUS_OK;
 579 }
 580
 581 /*
 582  * Initialize a struct smb_request from an inbuf
 583  */
 584
 585 static bool init_smb_request(struct smb_request *req,
 586                              struct smbd_server_connection *sconn,
 587                              struct smbXsrv_connection *xconn,
 588                              const uint8_t *inbuf,
 589                              size_t unread_bytes, bool encrypted,
 590                              uint32_t seqnum)
 591 {
 592         struct smbXsrv_tcon *tcon;
 593         NTSTATUS status;
 594         NTTIME now;
 595         size_t req_size = smb_len(inbuf) + 4;
 596
 597         /* Ensure we have at least smb_size bytes. */
 598         if (req_size < smb_size) {
 599                 DEBUG(0,("init_smb_request: invalid request size %u\n",
 600                         (unsigned int)req_size ));
 601                 return false;
 602         }
 603
 604         req->request_time = timeval_current();
 605         now = timeval_to_nttime(&req->request_time);
 606
 607         req->cmd    = CVAL(inbuf, smb_com);
 608         req->flags2 = SVAL(inbuf, smb_flg2);
 609         req->smbpid = SVAL(inbuf, smb_pid);
 610         req->mid    = (uint64_t)SVAL(inbuf, smb_mid);
 611         req->seqnum = seqnum;
 612         req->vuid   = SVAL(inbuf, smb_uid);
 613         req->tid    = SVAL(inbuf, smb_tid);
 614         req->wct    = CVAL(inbuf, smb_wct);
 615         req->vwv    = (const uint16_t *)(inbuf+smb_vwv);
 616         req->buflen = smb_buflen(inbuf);
 617         req->buf    = (const uint8_t *)smb_buf_const(inbuf);
 618         req->unread_bytes = unread_bytes;
 619         req->encrypted = encrypted;
 620         req->sconn = sconn;
 621         req->xconn = xconn;
 622         req->conn = NULL;
 623         if (xconn != NULL) {
 624                 status = smb1srv_tcon_lookup(xconn, req->tid, now, &tcon);
 625                 if (NT_STATUS_IS_OK(status)) {
 626                         req->conn = tcon->compat;
 627                 }
 628         }
 629         req->chain_fsp = NULL;
 630         req->smb2req = NULL;
 631         req->priv_paths = NULL;
 632         req->chain = NULL;
 633         req->posix_pathnames = lp_posix_pathnames();
 634         smb_init_perfcount_data(&req->pcd);
 635
 636         /* Ensure we have at least wct words and 2 bytes of bcc. */
 637         if (smb_size + req->wct*2 > req_size) {
 638                 DEBUG(0,("init_smb_request: invalid wct number %u (size %u)\n",
 639                         (unsigned int)req->wct,
 640                         (unsigned int)req_size));
 641                 return false;
 642         }
 643         /* Ensure bcc is correct. */
 644         if (((const uint8_t *)smb_buf_const(inbuf)) + req->buflen > inbuf + req_size) {
 645                 DEBUG(0,("init_smb_request: invalid bcc number %u "
 646                         "(wct = %u, size %u)\n",
 647                         (unsigned int)req->buflen,
 648                         (unsigned int)req->wct,
 649                         (unsigned int)req_size));
 650                 return false;
 651         }
 652
 653         req->outbuf = NULL;
 654         return true;
 655 }
 656
 657 static void process_smb(struct smbXsrv_connection *xconn,
 658                         uint8_t *inbuf, size_t nread, size_t unread_bytes,
 659                         uint32_t seqnum, bool encrypted,
 660                         struct smb_perfcount_data *deferred_pcd);
 661
 662 static void smbd_deferred_open_timer(struct tevent_context *ev,
 663                                      struct tevent_timer *te,
 664                                      struct timeval _tval,
 665                                      void *private_data)
 666 {
 667         struct pending_message_list *msg = talloc_get_type(private_data,
 668                                            struct pending_message_list);
 669         struct smbd_server_connection *sconn = msg->sconn;
 670         struct smbXsrv_connection *xconn = msg->xconn;
 671         TALLOC_CTX *mem_ctx = talloc_tos();
 672         uint64_t mid = (uint64_t)SVAL(msg->buf.data,smb_mid);
 673         uint8_t *inbuf;
 674
 675         inbuf = (uint8_t *)talloc_memdup(mem_ctx, msg->buf.data,
 676                                          msg->buf.length);
 677         if (inbuf == NULL) {
 678                 exit_server("smbd_deferred_open_timer: talloc failed\n");
 679                 return;
 680         }
 681
 682         /* We leave this message on the queue so the open code can
 683            know this is a retry. */
 684         DEBUG(5,("smbd_deferred_open_timer: trigger mid %llu.\n",
 685                 (unsigned long long)mid ));
 686
 687         /* Mark the message as processed so this is not
 688          * re-processed in error. */
 689         msg->processed = true;
 690
 691         process_smb(xconn, inbuf,
 692                     msg->buf.length, 0,
 693                     msg->seqnum, msg->encrypted, &msg->pcd);
 694
 695         /* If it's still there and was processed, remove it. */
 696         msg = get_deferred_open_message_smb(sconn, mid);
 697         if (msg && msg->processed) {
 698                 remove_deferred_open_message_smb(xconn, mid);
 699         }
 700 }
 701
 702 /****************************************************************************
 703  Function to push a message onto the tail of a linked list of smb messages ready
 704  for processing.
 705 ****************************************************************************/
 706
 707 static bool push_queued_message(struct smb_request *req,
 708                                 struct timeval request_time,
 709                                 struct timeval end_time,
 710                                 struct deferred_open_record *open_rec)
 711 {
 712         int msg_len = smb_len(req->inbuf) + 4;
 713         struct pending_message_list *msg;
 714
 715         msg = talloc_zero(NULL, struct pending_message_list);
 716
 717         if(msg == NULL) {
 718                 DEBUG(0,("push_message: malloc fail (1)\n"));
 719                 return False;
 720         }
 721         msg->sconn = req->sconn;
 722         msg->xconn = req->xconn;
 723
 724         msg->buf = data_blob_talloc(msg, req->inbuf, msg_len);
 725         if(msg->buf.data == NULL) {
 726                 DEBUG(0,("push_message: malloc fail (2)\n"));
 727                 TALLOC_FREE(msg);
 728                 return False;
 729         }
 730
 731         msg->request_time = request_time;
 732         msg->seqnum = req->seqnum;
 733         msg->encrypted = req->encrypted;
 734         msg->processed = false;
 735         SMB_PERFCOUNT_DEFER_OP(&req->pcd, &msg->pcd);
 736
 737         if (open_rec) {
 738                 msg->open_rec = talloc_move(msg, &open_rec);
 739         }
 740
 741 #if 0
 742         msg->te = tevent_add_timer(msg->sconn->ev_ctx,
 743                                    msg,
 744                                    end_time,
 745                                    smbd_deferred_open_timer,
 746                                    msg);
 747         if (!msg->te) {
 748                 DEBUG(0,("push_message: event_add_timed failed\n"));
 749                 TALLOC_FREE(msg);
 750                 return false;
 751         }
 752 #endif
 753
 754         DLIST_ADD_END(req->sconn->deferred_open_queue, msg);
 755
 756         DEBUG(10,("push_message: pushed message length %u on "
 757                   "deferred_open_queue\n", (unsigned int)msg_len));
 758
 759         return True;
 760 }
 761
 762 /****************************************************************************
 763  Function to delete a sharing violation open message by mid.
 764 ****************************************************************************/
 765
 766 void remove_deferred_open_message_smb(struct smbXsrv_connection *xconn,
 767                                       uint64_t mid)
 768 {
 769         struct smbd_server_connection *sconn = xconn->client->sconn;
 770         struct pending_message_list *pml;
 771
 772         if (sconn->using_smb2) {
 773                 remove_deferred_open_message_smb2(xconn, mid);
 774                 return;
 775         }
 776
 777         for (pml = sconn->deferred_open_queue; pml; pml = pml->next) {
 778                 if (mid == (uint64_t)SVAL(pml->buf.data,smb_mid)) {
 779                         DEBUG(10,("remove_deferred_open_message_smb: "
 780                                   "deleting mid %llu len %u\n",
 781                                   (unsigned long long)mid,
 782                                   (unsigned int)pml->buf.length ));
 783                         DLIST_REMOVE(sconn->deferred_open_queue, pml);
 784                         TALLOC_FREE(pml);
 785                         return;
 786                 }
 787         }
 788 }
 789
 790 /****************************************************************************
 791  Move a sharing violation open retry message to the front of the list and
 792  schedule it for immediate processing.
 793 ****************************************************************************/
 794
 795 bool schedule_deferred_open_message_smb(struct smbXsrv_connection *xconn,
 796                                         uint64_t mid)
 797 {
 798         struct smbd_server_connection *sconn = xconn->client->sconn;
 799         struct pending_message_list *pml;
 800         int i = 0;
 801
 802         if (sconn->using_smb2) {
 803                 return schedule_deferred_open_message_smb2(xconn, mid);
 804         }
 805
 806         for (pml = sconn->deferred_open_queue; pml; pml = pml->next) {
 807                 uint64_t msg_mid = (uint64_t)SVAL(pml->buf.data,smb_mid);
 808
 809                 DEBUG(10,("schedule_deferred_open_message_smb: [%d] "
 810                         "msg_mid = %llu\n",
 811                         i++,
 812                         (unsigned long long)msg_mid ));
 813
 814                 if (mid == msg_mid) {
 815                         struct tevent_timer *te;
 816
 817                         if (pml->processed) {
 818                                 /* A processed message should not be
 819                                  * rescheduled. */
 820                                 DEBUG(0,("schedule_deferred_open_message_smb: LOGIC ERROR "
 821                                         "message mid %llu was already processed\n",
 822                                         (unsigned long long)msg_mid ));
 823                                 continue;
 824                         }
 825
 826                         DEBUG(10,("schedule_deferred_open_message_smb: "
 827                                 "scheduling mid %llu\n",
 828                                 (unsigned long long)mid ));
 829
 830                         te = tevent_add_timer(pml->sconn->ev_ctx,
 831                                               pml,
 832                                               timeval_zero(),
 833                                               smbd_deferred_open_timer,
 834                                               pml);
 835                         if (!te) {
 836                                 DEBUG(10,("schedule_deferred_open_message_smb: "
 837                                         "event_add_timed() failed, "
 838                                         "skipping mid %llu\n",
 839                                         (unsigned long long)msg_mid ));
 840                         }
 841
 842                         TALLOC_FREE(pml->te);
 843                         pml->te = te;
 844                         DLIST_PROMOTE(sconn->deferred_open_queue, pml);
 845                         return true;
 846                 }
 847         }
 848
 849         DEBUG(10,("schedule_deferred_open_message_smb: failed to "
 850                 "find message mid %llu\n",
 851                 (unsigned long long)mid ));
 852
 853         return false;
 854 }
 855
 856 /****************************************************************************
 857  Return true if this mid is on the deferred queue and was not yet processed.
 858 ****************************************************************************/
 859
 860 bool open_was_deferred(struct smbXsrv_connection *xconn, uint64_t mid)
 861 {
 862         struct smbd_server_connection *sconn = xconn->client->sconn;
 863         struct pending_message_list *pml;
 864
 865         if (sconn->using_smb2) {
 866                 return open_was_deferred_smb2(xconn, mid);
 867         }
 868
 869         for (pml = sconn->deferred_open_queue; pml; pml = pml->next) {
 870                 if (((uint64_t)SVAL(pml->buf.data,smb_mid)) == mid && !pml->processed) {
 871                         return True;
 872                 }
 873         }
 874         return False;
 875 }
 876
 877 /****************************************************************************
 878  Return the message queued by this mid.
 879 ****************************************************************************/
 880
 881 static struct pending_message_list *get_deferred_open_message_smb(
 882         struct smbd_server_connection *sconn, uint64_t mid)
 883 {
 884         struct pending_message_list *pml;
 885
 886         for (pml = sconn->deferred_open_queue; pml; pml = pml->next) {
 887                 if (((uint64_t)SVAL(pml->buf.data,smb_mid)) == mid) {
 888                         return pml;
 889                 }
 890         }
 891         return NULL;
 892 }
 893
 894 /****************************************************************************
 895  Get the state data queued by this mid.
 896 ****************************************************************************/
 897
 898 bool get_deferred_open_message_state(struct smb_request *smbreq,
 899                                 struct timeval *p_request_time,
 900                                 struct deferred_open_record **open_rec)
 901 {
 902         struct pending_message_list *pml;
 903
 904         if (smbreq->sconn->using_smb2) {
 905                 return get_deferred_open_message_state_smb2(smbreq->smb2req,
 906                                         p_request_time,
 907                                         open_rec);
 908         }
 909
 910         pml = get_deferred_open_message_smb(smbreq->sconn, smbreq->mid);
 911         if (!pml) {
 912                 return false;
 913         }
 914         if (p_request_time) {
 915                 *p_request_time = pml->request_time;
 916         }
 917         if (open_rec != NULL) {
 918                 *open_rec = pml->open_rec;
 919         }
 920         return true;
 921 }
 922
 923 /****************************************************************************
 924  Function to push a deferred open smb message onto a linked list of local smb
 925  messages ready for processing.
 926 ****************************************************************************/
 927
 928 bool push_deferred_open_message_smb(struct smb_request *req,
 929                                struct timeval request_time,
 930                                struct timeval timeout,
 931                                struct file_id id,
 932                                struct deferred_open_record *open_rec)
 933 {
 934         struct timeval end_time;
 935
 936         if (req->smb2req) {
 937                 return push_deferred_open_message_smb2(req->smb2req,
 938                                                 request_time,
 939                                                 timeout,
 940                                                 id,
 941                                                 open_rec);
 942         }
 943
 944         if (req->unread_bytes) {
 945                 DEBUG(0,("push_deferred_open_message_smb: logic error ! "
 946                         "unread_bytes = %u\n",
 947                         (unsigned int)req->unread_bytes ));
 948                 smb_panic("push_deferred_open_message_smb: "
 949                         "logic error unread_bytes != 0" );
 950         }
 951
 952         end_time = timeval_sum(&request_time, &timeout);
 953
 954         DEBUG(10,("push_deferred_open_message_smb: pushing message "
 955                 "len %u mid %llu timeout time [%u.%06u]\n",
 956                 (unsigned int) smb_len(req->inbuf)+4,
 957                 (unsigned long long)req->mid,
 958                 (unsigned int)end_time.tv_sec,
 959                 (unsigned int)end_time.tv_usec));
 960
 961         return push_queued_message(req, request_time, end_time, open_rec);
 962 }
 963
 964 static void smbd_sig_term_handler(struct tevent_context *ev,
 965                                   struct tevent_signal *se,
 966                                   int signum,
 967                                   int count,
 968                                   void *siginfo,
 969                                   void *private_data)
 970 {
 971         exit_server_cleanly("termination signal");
 972 }
 973
 974 void smbd_setup_sig_term_handler(struct smbd_server_connection *sconn)
 975 {
 976         struct tevent_signal *se;
 977
 978         se = tevent_add_signal(sconn->ev_ctx,
 979                                sconn,
 980                                SIGTERM, 0,
 981                                smbd_sig_term_handler,
 982                                sconn);
 983         if (!se) {
 984                 exit_server("failed to setup SIGTERM handler");
 985         }
 986 }
 987
 988 static void smbd_sig_hup_handler(struct tevent_context *ev,
 989                                   struct tevent_signal *se,
 990                                   int signum,
 991                                   int count,
 992                                   void *siginfo,
 993                                   void *private_data)
 994 {
 995         struct smbd_server_connection *sconn =
 996                 talloc_get_type_abort(private_data,
 997                 struct smbd_server_connection);
 998
 999         change_to_root_user();
1000         DEBUG(1,("Reloading services after SIGHUP\n"));
1001         reload_services(sconn, conn_snum_used, false);
1002 }
1003
1004 void smbd_setup_sig_hup_handler(struct smbd_server_connection *sconn)
1005 {
1006         struct tevent_signal *se;
1007
1008         se = tevent_add_signal(sconn->ev_ctx,
1009                                sconn,
1010                                SIGHUP, 0,
1011                                smbd_sig_hup_handler,
1012                                sconn);
1013         if (!se) {
1014                 exit_server("failed to setup SIGHUP handler");
1015         }
1016 }
1017
1018 static void smbd_conf_updated(struct messaging_context *msg,
1019                               void *private_data,
1020                               uint32_t msg_type,
1021                               struct server_id server_id,
1022                               DATA_BLOB *data)
1023 {
1024         struct smbd_server_connection *sconn =
1025                 talloc_get_type_abort(private_data,
1026                 struct smbd_server_connection);
1027
1028         DEBUG(10,("smbd_conf_updated: Got message saying smb.conf was "
1029                   "updated. Reloading.\n"));
1030         change_to_root_user();
1031         reload_services(sconn, conn_snum_used, false);
1032 }
1033
1034 /*
1035  * Only allow 5 outstanding trans requests. We're allocating memory, so
1036  * prevent a DoS.
1037  */
1038
1039 NTSTATUS allow_new_trans(struct trans_state *list, uint64_t mid)
1040 {
1041         int count = 0;
1042         for (; list != NULL; list = list->next) {
1043
1044                 if (list->mid == mid) {
1045                         return NT_STATUS_INVALID_PARAMETER;
1046                 }
1047
1048                 count += 1;
1049         }
1050         if (count > 5) {
1051                 return NT_STATUS_INSUFFICIENT_RESOURCES;
1052         }
1053
1054         return NT_STATUS_OK;
1055 }
1056
1057 /*
1058 These flags determine some of the permissions required to do an operation
1059
1060 Note that I don't set NEED_WRITE on some write operations because they
1061 are used by some brain-dead clients when printing, and I don't want to
1062 force write permissions on print services.
1063 */
1064 #define AS_USER (1<<0)
1065 #define NEED_WRITE (1<<1) /* Must be paired with AS_USER */
1066 #define TIME_INIT (1<<2)
1067 #define CAN_IPC (1<<3) /* Must be paired with AS_USER */
1068 #define AS_GUEST (1<<5) /* Must *NOT* be paired with AS_USER */
1069 #define DO_CHDIR (1<<6)
1070
1071 /*
1072    define a list of possible SMB messages and their corresponding
1073    functions. Any message that has a NULL function is unimplemented -
1074    please feel free to contribute implementations!
1075 */
1076 static const struct smb_message_struct {
1077         const char *name;
1078         void (*fn)(struct smb_request *req);
1079         int flags;
1080 } smb_messages[256] = {
1081
1082 /* 0x00 */ { "SMBmkdir",reply_mkdir,AS_USER | NEED_WRITE},
1083 /* 0x01 */ { "SMBrmdir",reply_rmdir,AS_USER | NEED_WRITE},
1084 /* 0x02 */ { "SMBopen",reply_open,AS_USER },
1085 /* 0x03 */ { "SMBcreate",reply_mknew,AS_USER},
1086 /* 0x04 */ { "SMBclose",reply_close,AS_USER | CAN_IPC },
1087 /* 0x05 */ { "SMBflush",reply_flush,AS_USER},
1088 /* 0x06 */ { "SMBunlink",reply_unlink,AS_USER | NEED_WRITE },
1089 /* 0x07 */ { "SMBmv",reply_mv,AS_USER | NEED_WRITE },
1090 /* 0x08 */ { "SMBgetatr",reply_getatr,AS_USER},
1091 /* 0x09 */ { "SMBsetatr",reply_setatr,AS_USER | NEED_WRITE},
1092 /* 0x0a */ { "SMBread",reply_read,AS_USER},
1093 /* 0x0b */ { "SMBwrite",reply_write,AS_USER | CAN_IPC },
1094 /* 0x0c */ { "SMBlock",reply_lock,AS_USER},
1095 /* 0x0d */ { "SMBunlock",reply_unlock,AS_USER},
1096 /* 0x0e */ { "SMBctemp",reply_ctemp,AS_USER },
1097 /* 0x0f */ { "SMBmknew",reply_mknew,AS_USER},
1098 /* 0x10 */ { "SMBcheckpath",reply_checkpath,AS_USER},
1099 /* 0x11 */ { "SMBexit",reply_exit,DO_CHDIR},
1100 /* 0x12 */ { "SMBlseek",reply_lseek,AS_USER},
1101 /* 0x13 */ { "SMBlockread",reply_lockread,AS_USER},
1102 /* 0x14 */ { "SMBwriteunlock",reply_writeunlock,AS_USER},
1103 /* 0x15 */ { NULL, NULL, 0 },
1104 /* 0x16 */ { NULL, NULL, 0 },
1105 /* 0x17 */ { NULL, NULL, 0 },
1106 /* 0x18 */ { NULL, NULL, 0 },
1107 /* 0x19 */ { NULL, NULL, 0 },
1108 /* 0x1a */ { "SMBreadbraw",reply_readbraw,AS_USER},
1109 /* 0x1b */ { "SMBreadBmpx",reply_readbmpx,AS_USER},
1110 /* 0x1c */ { "SMBreadBs",reply_readbs,AS_USER },
1111 /* 0x1d */ { "SMBwritebraw",reply_writebraw,AS_USER},
1112 /* 0x1e */ { "SMBwriteBmpx",reply_writebmpx,AS_USER},
1113 /* 0x1f */ { "SMBwriteBs",reply_writebs,AS_USER},
1114 /* 0x20 */ { "SMBwritec", NULL,0},
1115 /* 0x21 */ { NULL, NULL, 0 },
1116 /* 0x22 */ { "SMBsetattrE",reply_setattrE,AS_USER | NEED_WRITE },
1117 /* 0x23 */ { "SMBgetattrE",reply_getattrE,AS_USER },
1118 /* 0x24 */ { "SMBlockingX",reply_lockingX,AS_USER },
1119 /* 0x25 */ { "SMBtrans",reply_trans,AS_USER | CAN_IPC },
1120 /* 0x26 */ { "SMBtranss",reply_transs,AS_USER | CAN_IPC},
1121 /* 0x27 */ { "SMBioctl",reply_ioctl,0},
1122 /* 0x28 */ { "SMBioctls", NULL,AS_USER},
1123 /* 0x29 */ { "SMBcopy",reply_copy,AS_USER | NEED_WRITE },
1124 /* 0x2a */ { "SMBmove", NULL,AS_USER | NEED_WRITE },
1125 /* 0x2b */ { "SMBecho",reply_echo,0},
1126 /* 0x2c */ { "SMBwriteclose",reply_writeclose,AS_USER},
1127 /* 0x2d */ { "SMBopenX",reply_open_and_X,AS_USER | CAN_IPC },
1128 /* 0x2e */ { "SMBreadX",reply_read_and_X,AS_USER | CAN_IPC },
1129 /* 0x2f */ { "SMBwriteX",reply_write_and_X,AS_USER | CAN_IPC },
1130 /* 0x30 */ { NULL, NULL, 0 },
1131 /* 0x31 */ { NULL, NULL, 0 },
1132 /* 0x32 */ { "SMBtrans2",reply_trans2, AS_USER | CAN_IPC },
1133 /* 0x33 */ { "SMBtranss2",reply_transs2, AS_USER | CAN_IPC },
1134 /* 0x34 */ { "SMBfindclose",reply_findclose,AS_USER},
1135 /* 0x35 */ { "SMBfindnclose",reply_findnclose,AS_USER},
1136 /* 0x36 */ { NULL, NULL, 0 },
1137 /* 0x37 */ { NULL, NULL, 0 },
1138 /* 0x38 */ { NULL, NULL, 0 },
1139 /* 0x39 */ { NULL, NULL, 0 },
1140 /* 0x3a */ { NULL, NULL, 0 },
1141 /* 0x3b */ { NULL, NULL, 0 },
1142 /* 0x3c */ { NULL, NULL, 0 },
1143 /* 0x3d */ { NULL, NULL, 0 },
1144 /* 0x3e */ { NULL, NULL, 0 },
1145 /* 0x3f */ { NULL, NULL, 0 },
1146 /* 0x40 */ { NULL, NULL, 0 },
1147 /* 0x41 */ { NULL, NULL, 0 },
1148 /* 0x42 */ { NULL, NULL, 0 },
1149 /* 0x43 */ { NULL, NULL, 0 },
1150 /* 0x44 */ { NULL, NULL, 0 },
1151 /* 0x45 */ { NULL, NULL, 0 },
1152 /* 0x46 */ { NULL, NULL, 0 },
1153 /* 0x47 */ { NULL, NULL, 0 },
1154 /* 0x48 */ { NULL, NULL, 0 },
1155 /* 0x49 */ { NULL, NULL, 0 },
1156 /* 0x4a */ { NULL, NULL, 0 },
1157 /* 0x4b */ { NULL, NULL, 0 },
1158 /* 0x4c */ { NULL, NULL, 0 },
1159 /* 0x4d */ { NULL, NULL, 0 },
1160 /* 0x4e */ { NULL, NULL, 0 },
1161 /* 0x4f */ { NULL, NULL, 0 },
1162 /* 0x50 */ { NULL, NULL, 0 },
1163 /* 0x51 */ { NULL, NULL, 0 },
1164 /* 0x52 */ { NULL, NULL, 0 },
1165 /* 0x53 */ { NULL, NULL, 0 },
1166 /* 0x54 */ { NULL, NULL, 0 },
1167 /* 0x55 */ { NULL, NULL, 0 },
1168 /* 0x56 */ { NULL, NULL, 0 },
1169 /* 0x57 */ { NULL, NULL, 0 },
1170 /* 0x58 */ { NULL, NULL, 0 },
1171 /* 0x59 */ { NULL, NULL, 0 },
1172 /* 0x5a */ { NULL, NULL, 0 },
1173 /* 0x5b */ { NULL, NULL, 0 },
1174 /* 0x5c */ { NULL, NULL, 0 },
1175 /* 0x5d */ { NULL, NULL, 0 },
1176 /* 0x5e */ { NULL, NULL, 0 },
1177 /* 0x5f */ { NULL, NULL, 0 },
1178 /* 0x60 */ { NULL, NULL, 0 },
1179 /* 0x61 */ { NULL, NULL, 0 },
1180 /* 0x62 */ { NULL, NULL, 0 },
1181 /* 0x63 */ { NULL, NULL, 0 },
1182 /* 0x64 */ { NULL, NULL, 0 },
1183 /* 0x65 */ { NULL, NULL, 0 },
1184 /* 0x66 */ { NULL, NULL, 0 },
1185 /* 0x67 */ { NULL, NULL, 0 },
1186 /* 0x68 */ { NULL, NULL, 0 },
1187 /* 0x69 */ { NULL, NULL, 0 },
1188 /* 0x6a */ { NULL, NULL, 0 },
1189 /* 0x6b */ { NULL, NULL, 0 },
1190 /* 0x6c */ { NULL, NULL, 0 },
1191 /* 0x6d */ { NULL, NULL, 0 },
1192 /* 0x6e */ { NULL, NULL, 0 },
1193 /* 0x6f */ { NULL, NULL, 0 },
1194 /* 0x70 */ { "SMBtcon",reply_tcon,0},
1195 /* 0x71 */ { "SMBtdis",reply_tdis,DO_CHDIR},
1196 /* 0x72 */ { "SMBnegprot",reply_negprot,0},
1197 /* 0x73 */ { "SMBsesssetupX",reply_sesssetup_and_X,0},
1198 /* 0x74 */ { "SMBulogoffX",reply_ulogoffX, 0}, /* ulogoff doesn't give a valid TID */
1199 /* 0x75 */ { "SMBtconX",reply_tcon_and_X,0},
1200 /* 0x76 */ { NULL, NULL, 0 },
1201 /* 0x77 */ { NULL, NULL, 0 },
1202 /* 0x78 */ { NULL, NULL, 0 },
1203 /* 0x79 */ { NULL, NULL, 0 },
1204 /* 0x7a */ { NULL, NULL, 0 },
1205 /* 0x7b */ { NULL, NULL, 0 },
1206 /* 0x7c */ { NULL, NULL, 0 },
1207 /* 0x7d */ { NULL, NULL, 0 },
1208 /* 0x7e */ { NULL, NULL, 0 },
1209 /* 0x7f */ { NULL, NULL, 0 },
1210 /* 0x80 */ { "SMBdskattr",reply_dskattr,AS_USER},
1211 /* 0x81 */ { "SMBsearch",reply_search,AS_USER},
1212 /* 0x82 */ { "SMBffirst",reply_search,AS_USER},
1213 /* 0x83 */ { "SMBfunique",reply_search,AS_USER},
1214 /* 0x84 */ { "SMBfclose",reply_fclose,AS_USER},
1215 /* 0x85 */ { NULL, NULL, 0 },
1216 /* 0x86 */ { NULL, NULL, 0 },
1217 /* 0x87 */ { NULL, NULL, 0 },
1218 /* 0x88 */ { NULL, NULL, 0 },
1219 /* 0x89 */ { NULL, NULL, 0 },
1220 /* 0x8a */ { NULL, NULL, 0 },
1221 /* 0x8b */ { NULL, NULL, 0 },
1222 /* 0x8c */ { NULL, NULL, 0 },
1223 /* 0x8d */ { NULL, NULL, 0 },
1224 /* 0x8e */ { NULL, NULL, 0 },
1225 /* 0x8f */ { NULL, NULL, 0 },
1226 /* 0x90 */ { NULL, NULL, 0 },
1227 /* 0x91 */ { NULL, NULL, 0 },
1228 /* 0x92 */ { NULL, NULL, 0 },
1229 /* 0x93 */ { NULL, NULL, 0 },
1230 /* 0x94 */ { NULL, NULL, 0 },
1231 /* 0x95 */ { NULL, NULL, 0 },
1232 /* 0x96 */ { NULL, NULL, 0 },
1233 /* 0x97 */ { NULL, NULL, 0 },
1234 /* 0x98 */ { NULL, NULL, 0 },
1235 /* 0x99 */ { NULL, NULL, 0 },
1236 /* 0x9a */ { NULL, NULL, 0 },
1237 /* 0x9b */ { NULL, NULL, 0 },
1238 /* 0x9c */ { NULL, NULL, 0 },
1239 /* 0x9d */ { NULL, NULL, 0 },
1240 /* 0x9e */ { NULL, NULL, 0 },
1241 /* 0x9f */ { NULL, NULL, 0 },
1242 /* 0xa0 */ { "SMBnttrans",reply_nttrans, AS_USER | CAN_IPC },
1243 /* 0xa1 */ { "SMBnttranss",reply_nttranss, AS_USER | CAN_IPC },
1244 /* 0xa2 */ { "SMBntcreateX",reply_ntcreate_and_X, AS_USER | CAN_IPC },
1245 /* 0xa3 */ { NULL, NULL, 0 },
1246 /* 0xa4 */ { "SMBntcancel",reply_ntcancel, 0 },
1247 /* 0xa5 */ { "SMBntrename",reply_ntrename, AS_USER | NEED_WRITE },
1248 /* 0xa6 */ { NULL, NULL, 0 },
1249 /* 0xa7 */ { NULL, NULL, 0 },
1250 /* 0xa8 */ { NULL, NULL, 0 },
1251 /* 0xa9 */ { NULL, NULL, 0 },
1252 /* 0xaa */ { NULL, NULL, 0 },
1253 /* 0xab */ { NULL, NULL, 0 },
1254 /* 0xac */ { NULL, NULL, 0 },
1255 /* 0xad */ { NULL, NULL, 0 },
1256 /* 0xae */ { NULL, NULL, 0 },
1257 /* 0xaf */ { NULL, NULL, 0 },
1258 /* 0xb0 */ { NULL, NULL, 0 },
1259 /* 0xb1 */ { NULL, NULL, 0 },
1260 /* 0xb2 */ { NULL, NULL, 0 },
1261 /* 0xb3 */ { NULL, NULL, 0 },
1262 /* 0xb4 */ { NULL, NULL, 0 },
1263 /* 0xb5 */ { NULL, NULL, 0 },
1264 /* 0xb6 */ { NULL, NULL, 0 },
1265 /* 0xb7 */ { NULL, NULL, 0 },
1266 /* 0xb8 */ { NULL, NULL, 0 },
1267 /* 0xb9 */ { NULL, NULL, 0 },
1268 /* 0xba */ { NULL, NULL, 0 },
1269 /* 0xbb */ { NULL, NULL, 0 },
1270 /* 0xbc */ { NULL, NULL, 0 },
1271 /* 0xbd */ { NULL, NULL, 0 },
1272 /* 0xbe */ { NULL, NULL, 0 },
1273 /* 0xbf */ { NULL, NULL, 0 },
1274 /* 0xc0 */ { "SMBsplopen",reply_printopen,AS_USER},
1275 /* 0xc1 */ { "SMBsplwr",reply_printwrite,AS_USER},
1276 /* 0xc2 */ { "SMBsplclose",reply_printclose,AS_USER},
1277 /* 0xc3 */ { "SMBsplretq",reply_printqueue,AS_USER},
1278 /* 0xc4 */ { NULL, NULL, 0 },
1279 /* 0xc5 */ { NULL, NULL, 0 },
1280 /* 0xc6 */ { NULL, NULL, 0 },
1281 /* 0xc7 */ { NULL, NULL, 0 },
1282 /* 0xc8 */ { NULL, NULL, 0 },
1283 /* 0xc9 */ { NULL, NULL, 0 },
1284 /* 0xca */ { NULL, NULL, 0 },
1285 /* 0xcb */ { NULL, NULL, 0 },
1286 /* 0xcc */ { NULL, NULL, 0 },
1287 /* 0xcd */ { NULL, NULL, 0 },
1288 /* 0xce */ { NULL, NULL, 0 },
1289 /* 0xcf */ { NULL, NULL, 0 },
1290 /* 0xd0 */ { "SMBsends",reply_sends,AS_GUEST},
1291 /* 0xd1 */ { "SMBsendb", NULL,AS_GUEST},
1292 /* 0xd2 */ { "SMBfwdname", NULL,AS_GUEST},
1293 /* 0xd3 */ { "SMBcancelf", NULL,AS_GUEST},
1294 /* 0xd4 */ { "SMBgetmac", NULL,AS_GUEST},
1295 /* 0xd5 */ { "SMBsendstrt",reply_sendstrt,AS_GUEST},
1296 /* 0xd6 */ { "SMBsendend",reply_sendend,AS_GUEST},
1297 /* 0xd7 */ { "SMBsendtxt",reply_sendtxt,AS_GUEST},
1298 /* 0xd8 */ { NULL, NULL, 0 },
1299 /* 0xd9 */ { NULL, NULL, 0 },
1300 /* 0xda */ { NULL, NULL, 0 },
1301 /* 0xdb */ { NULL, NULL, 0 },
1302 /* 0xdc */ { NULL, NULL, 0 },
1303 /* 0xdd */ { NULL, NULL, 0 },
1304 /* 0xde */ { NULL, NULL, 0 },
1305 /* 0xdf */ { NULL, NULL, 0 },
1306 /* 0xe0 */ { NULL, NULL, 0 },
1307 /* 0xe1 */ { NULL, NULL, 0 },
1308 /* 0xe2 */ { NULL, NULL, 0 },
1309 /* 0xe3 */ { NULL, NULL, 0 },
1310 /* 0xe4 */ { NULL, NULL, 0 },
1311 /* 0xe5 */ { NULL, NULL, 0 },
1312 /* 0xe6 */ { NULL, NULL, 0 },
1313 /* 0xe7 */ { NULL, NULL, 0 },
1314 /* 0xe8 */ { NULL, NULL, 0 },
1315 /* 0xe9 */ { NULL, NULL, 0 },
1316 /* 0xea */ { NULL, NULL, 0 },
1317 /* 0xeb */ { NULL, NULL, 0 },
1318 /* 0xec */ { NULL, NULL, 0 },
1319 /* 0xed */ { NULL, NULL, 0 },
1320 /* 0xee */ { NULL, NULL, 0 },
1321 /* 0xef */ { NULL, NULL, 0 },
1322 /* 0xf0 */ { NULL, NULL, 0 },
1323 /* 0xf1 */ { NULL, NULL, 0 },
1324 /* 0xf2 */ { NULL, NULL, 0 },
1325 /* 0xf3 */ { NULL, NULL, 0 },
1326 /* 0xf4 */ { NULL, NULL, 0 },
1327 /* 0xf5 */ { NULL, NULL, 0 },
1328 /* 0xf6 */ { NULL, NULL, 0 },
1329 /* 0xf7 */ { NULL, NULL, 0 },
1330 /* 0xf8 */ { NULL, NULL, 0 },
1331 /* 0xf9 */ { NULL, NULL, 0 },
1332 /* 0xfa */ { NULL, NULL, 0 },
1333 /* 0xfb */ { NULL, NULL, 0 },
1334 /* 0xfc */ { NULL, NULL, 0 },
1335 /* 0xfd */ { NULL, NULL, 0 },
1336 /* 0xfe */ { NULL, NULL, 0 },
1337 /* 0xff */ { NULL, NULL, 0 }
1338
1339 };
1340
1341 /*******************************************************************
1342  allocate and initialize a reply packet
1343 ********************************************************************/
1344
1345 static bool create_outbuf(TALLOC_CTX *mem_ctx, struct smb_request *req,
1346                           const uint8_t *inbuf, char **outbuf,
1347                           uint8_t num_words, uint32_t num_bytes)
1348 {
1349         size_t smb_len = MIN_SMB_SIZE + VWV(num_words) + num_bytes;
1350
1351         /*
1352          * Protect against integer wrap.
1353          * The SMB layer reply can be up to 0xFFFFFF bytes.
1354          */
1355         if ((num_bytes > 0xffffff) || (smb_len > 0xffffff)) {
1356                 char *msg;
1357                 if (asprintf(&msg, "num_bytes too large: %u",
1358                              (unsigned)num_bytes) == -1) {
1359                         msg = discard_const_p(char, "num_bytes too large");
1360                 }
1361                 smb_panic(msg);
1362         }
1363
1364         /*
1365          * Here we include the NBT header for now.
1366          */
1367         *outbuf = talloc_array(mem_ctx, char,
1368                                NBT_HDR_SIZE + smb_len);
1369         if (*outbuf == NULL) {
1370                 return false;
1371         }
1372
1373         construct_reply_common(req->cmd, inbuf, *outbuf);
1374         srv_set_message(*outbuf, num_words, num_bytes, false);
1375         /*
1376          * Zero out the word area, the caller has to take care of the bcc area
1377          * himself
1378          */
1379         if (num_words != 0) {
1380                 memset(*outbuf + (NBT_HDR_SIZE + HDR_VWV), 0, VWV(num_words));
1381         }
1382
1383         return true;
1384 }
1385
1386 void reply_outbuf(struct smb_request *req, uint8_t num_words, uint32_t num_bytes)
1387 {
1388         char *outbuf;
1389         if (!create_outbuf(req, req, req->inbuf, &outbuf, num_words,
1390                            num_bytes)) {
1391                 smb_panic("could not allocate output buffer\n");
1392         }
1393         req->outbuf = (uint8_t *)outbuf;
1394 }
1395
1396
1397 /*******************************************************************
1398  Dump a packet to a file.
1399 ********************************************************************/
1400
1401 static void smb_dump(const char *name, int type, const char *data)
1402 {
1403         size_t len;
1404         int fd, i;
1405         char *fname = NULL;
1406         if (DEBUGLEVEL < 50) {
1407                 return;
1408         }
1409
1410         len = smb_len_tcp(data)+4;
1411         for (i=1;i<100;i++) {
1412                 fname = talloc_asprintf(talloc_tos(),
1413                                 "/tmp/%s.%d.%s",
1414                                 name,
1415                                 i,
1416                                 type ? "req" : "resp");
1417                 if (fname == NULL) {
1418                         return;
1419                 }
1420                 fd = open(fname, O_WRONLY|O_CREAT|O_EXCL, 0644);
1421                 if (fd != -1 || errno != EEXIST) break;
1422                 TALLOC_FREE(fname);
1423         }
1424         if (fd != -1) {
1425                 ssize_t ret = write(fd, data, len);
1426                 if (ret != len)
1427                         DEBUG(0,("smb_dump: problem: write returned %d\n", (int)ret ));
1428                 close(fd);
1429                 DEBUG(0,("created %s len %lu\n", fname, (unsigned long)len));
1430         }
1431         TALLOC_FREE(fname);
1432 }
1433
1434 static void smb1srv_update_crypto_flags(struct smbXsrv_session *session,
1435                                         struct smb_request *req,
1436                                         uint8_t type,
1437                                         bool *update_session_globalp,
1438                                         bool *update_tcon_globalp)
1439 {
1440         connection_struct *conn = req->conn;
1441         struct smbXsrv_tcon *tcon = conn ? conn->tcon : NULL;
1442         uint8_t encrypt_flag = SMBXSRV_PROCESSED_UNENCRYPTED_PACKET;
1443         uint8_t sign_flag = SMBXSRV_PROCESSED_UNSIGNED_PACKET;
1444         bool update_session = false;
1445         bool update_tcon = false;
1446
1447         if (req->encrypted) {
1448                 encrypt_flag = SMBXSRV_PROCESSED_ENCRYPTED_PACKET;
1449         }
1450
1451         if (srv_is_signing_active(req->xconn)) {
1452                 sign_flag = SMBXSRV_PROCESSED_SIGNED_PACKET;
1453         } else if ((type == SMBecho) || (type == SMBsesssetupX)) {
1454                 /*
1455                  * echo can be unsigned. Sesssion setup except final
1456                  * session setup response too
1457                  */
1458                 sign_flag &= ~SMBXSRV_PROCESSED_UNSIGNED_PACKET;
1459         }
1460
1461         update_session |= smbXsrv_set_crypto_flag(
1462                 &session->global->encryption_flags, encrypt_flag);
1463         update_session |= smbXsrv_set_crypto_flag(
1464                 &session->global->signing_flags, sign_flag);
1465
1466         if (tcon) {
1467                 update_tcon |= smbXsrv_set_crypto_flag(
1468                         &tcon->global->encryption_flags, encrypt_flag);
1469                 update_tcon |= smbXsrv_set_crypto_flag(
1470                         &tcon->global->signing_flags, sign_flag);
1471         }
1472
1473         if (update_session) {
1474                 session->global->channels[0].encryption_cipher = SMB_ENCRYPTION_GSSAPI;
1475         }
1476
1477         *update_session_globalp = update_session;
1478         *update_tcon_globalp = update_tcon;
1479         return;
1480 }
1481
1482 /****************************************************************************
1483  Prepare everything for calling the actual request function, and potentially
1484  call the request function via the "new" interface.
1485
1486  Return False if the "legacy" function needs to be called, everything is
1487  prepared.
1488
1489  Return True if we're done.
1490
1491  I know this API sucks, but it is the one with the least code change I could
1492  find.
1493 ****************************************************************************/
1494
1495 static connection_struct *switch_message(uint8_t type, struct smb_request *req)
1496 {
1497         int flags;
1498         uint64_t session_tag;
1499         connection_struct *conn = NULL;
1500         struct smbXsrv_connection *xconn = req->xconn;
1501         NTTIME now = timeval_to_nttime(&req->request_time);
1502         struct smbXsrv_session *session = NULL;
1503         NTSTATUS status;
1504
1505         errno = 0;
1506
1507         if (!xconn->smb1.negprot.done) {
1508                 switch (type) {
1509                         /*
1510                          * Without a negprot the request must
1511                          * either be a negprot, or one of the
1512                          * evil old SMB mailslot messaging types.
1513                          */
1514                         case SMBnegprot:
1515                         case SMBsendstrt:
1516                         case SMBsendend:
1517                         case SMBsendtxt:
1518                                 break;
1519                         default:
1520                                 exit_server_cleanly("The first request "
1521                                         "should be a negprot");
1522                 }
1523         }
1524
1525         if (smb_messages[type].fn == NULL) {
1526                 DEBUG(0,("Unknown message type %d!\n",type));
1527                 smb_dump("Unknown", 1, (const char *)req->inbuf);
1528                 reply_unknown_new(req, type);
1529                 return NULL;
1530         }
1531
1532         flags = smb_messages[type].flags;
1533
1534         /* In share mode security we must ignore the vuid. */
1535         session_tag = req->vuid;
1536         conn = req->conn;
1537
1538         DEBUG(3,("switch message %s (pid %d) conn 0x%lx\n", smb_fn_name(type),
1539                  (int)getpid(), (unsigned long)conn));
1540
1541         smb_dump(smb_fn_name(type), 1, (const char *)req->inbuf);
1542
1543         /* Ensure this value is replaced in the incoming packet. */
1544         SSVAL(discard_const_p(uint8_t, req->inbuf),smb_uid,session_tag);
1545
1546         /*
1547          * Ensure the correct username is in current_user_info.  This is a
1548          * really ugly bugfix for problems with multiple session_setup_and_X's
1549          * being done and allowing %U and %G substitutions to work correctly.
1550          * There is a reason this code is done here, don't move it unless you
1551          * know what you're doing... :-).
1552          * JRA.
1553          */
1554
1555         /*
1556          * lookup an existing session
1557          *
1558          * Note: for now we only check for NT_STATUS_NETWORK_SESSION_EXPIRED
1559          * here, the main check is still in change_to_user()
1560          */
1561         status = smb1srv_session_lookup(xconn,
1562                                         session_tag,
1563                                         now,
1564                                         &session);
1565         if (NT_STATUS_EQUAL(status, NT_STATUS_NETWORK_SESSION_EXPIRED)) {
1566                 switch (type) {
1567                 case SMBsesssetupX:
1568                         status = NT_STATUS_OK;
1569                         break;
1570                 default:
1571                         DEBUG(1,("Error: session %llu is expired, mid=%llu.\n",
1572                                  (unsigned long long)session_tag,
1573                                  (unsigned long long)req->mid));
1574                         reply_nterror(req, NT_STATUS_NETWORK_SESSION_EXPIRED);
1575                         return conn;
1576                 }
1577         }
1578
1579         if (session_tag != xconn->client->last_session_id) {
1580                 struct user_struct *vuser = NULL;
1581
1582                 xconn->client->last_session_id = session_tag;
1583                 if (session) {
1584                         vuser = session->compat;
1585                 }
1586                 if (vuser) {
1587                         set_current_user_info(
1588                                 vuser->session_info->unix_info->sanitized_username,
1589                                 vuser->session_info->unix_info->unix_name,
1590                                 vuser->session_info->info->domain_name);
1591                 }
1592         }
1593
1594         /* Does this call need to be run as the connected user? */
1595         if (flags & AS_USER) {
1596
1597                 /* Does this call need a valid tree connection? */
1598                 if (!conn) {
1599                         /*
1600                          * Amazingly, the error code depends on the command
1601                          * (from Samba4).
1602                          */
1603                         if (type == SMBntcreateX) {
1604                                 reply_nterror(req, NT_STATUS_INVALID_HANDLE);
1605                         } else {
1606                                 reply_nterror(req, NT_STATUS_NETWORK_NAME_DELETED);
1607                         }
1608                         return NULL;
1609                 }
1610
1611                 if (!change_to_user(conn,session_tag)) {
1612                         DEBUG(0, ("Error: Could not change to user. Removing "
1613                                 "deferred open, mid=%llu.\n",
1614                                 (unsigned long long)req->mid));
1615                         reply_force_doserror(req, ERRSRV, ERRbaduid);
1616                         return conn;
1617                 }
1618
1619                 /* All NEED_WRITE and CAN_IPC flags must also have AS_USER. */
1620
1621                 /* Does it need write permission? */
1622                 if ((flags & NEED_WRITE) && !CAN_WRITE(conn)) {
1623                         reply_nterror(req, NT_STATUS_MEDIA_WRITE_PROTECTED);
1624                         return conn;
1625                 }
1626
1627                 /* IPC services are limited */
1628                 if (IS_IPC(conn) && !(flags & CAN_IPC)) {
1629                         reply_nterror(req, NT_STATUS_ACCESS_DENIED);
1630                         return conn;
1631                 }
1632         } else {
1633                 /* This call needs to be run as root */
1634                 change_to_root_user();
1635         }
1636
1637         /* load service specific parameters */
1638         if (conn) {
1639                 if (req->encrypted) {
1640                         conn->encrypted_tid = true;
1641                         /* encrypted required from now on. */
1642                         conn->encrypt_level = SMB_SIGNING_REQUIRED;
1643                 } else if (ENCRYPTION_REQUIRED(conn)) {
1644                         if (req->cmd != SMBtrans2 && req->cmd != SMBtranss2) {
1645                                 DEBUG(1,("service[%s] requires encryption"
1646                                         "%s ACCESS_DENIED. mid=%llu\n",
1647                                         lp_servicename(talloc_tos(), SNUM(conn)),
1648                                         smb_fn_name(type),
1649                                         (unsigned long long)req->mid));
1650                                 reply_nterror(req, NT_STATUS_ACCESS_DENIED);
1651                                 return conn;
1652                         }
1653                 }
1654
1655                 if (!set_current_service(conn,SVAL(req->inbuf,smb_flg),
1656                                          (flags & (AS_USER|DO_CHDIR)
1657                                           ?True:False))) {
1658                         reply_nterror(req, NT_STATUS_ACCESS_DENIED);
1659                         return conn;
1660                 }
1661                 conn->num_smb_operations++;
1662         }
1663
1664         /*
1665          * Does this protocol need to be run as guest? (Only archane
1666          * messenger service requests have this...)
1667          */
1668         if (flags & AS_GUEST) {
1669                 char *raddr;
1670                 bool ok;
1671
1672                 if (!change_to_guest()) {
1673                         reply_nterror(req, NT_STATUS_ACCESS_DENIED);
1674                         return conn;
1675                 }
1676
1677                 raddr = tsocket_address_inet_addr_string(xconn->remote_address,
1678                                                          talloc_tos());
1679                 if (raddr == NULL) {
1680                         reply_nterror(req, NT_STATUS_NO_MEMORY);
1681                         return conn;
1682                 }
1683
1684                 /*
1685                  * Haven't we checked this in smbd_process already???
1686                  */
1687
1688                 ok = allow_access(lp_hosts_deny(-1), lp_hosts_allow(-1),
1689                                   xconn->remote_hostname, raddr);
1690                 TALLOC_FREE(raddr);
1691
1692                 if (!ok) {
1693                         reply_nterror(req, NT_STATUS_ACCESS_DENIED);
1694                         return conn;
1695                 }
1696         }
1697
1698         /*
1699          * Update encryption and signing state tracking flags that are
1700          * used by smbstatus to display signing and encryption status.
1701          */
1702         if (session != NULL) {
1703                 bool update_session_global = false;
1704                 bool update_tcon_global = false;
1705
1706                 smb1srv_update_crypto_flags(session, req, type,
1707                                             &update_session_global,
1708                                             &update_tcon_global);
1709
1710                 if (update_session_global) {
1711                         status = smbXsrv_session_update(session);
1712                         if (!NT_STATUS_IS_OK(status)) {
1713                                 reply_nterror(req, NT_STATUS_UNSUCCESSFUL);
1714                                 return conn;
1715                         }
1716                 }
1717
1718                 if (update_tcon_global) {
1719                         status = smbXsrv_tcon_update(req->conn->tcon);
1720                         if (!NT_STATUS_IS_OK(status)) {
1721                                 reply_nterror(req, NT_STATUS_UNSUCCESSFUL);
1722                                 return conn;
1723                         }
1724                 }
1725         }
1726
1727         smb_messages[type].fn(req);
1728         return req->conn;
1729 }
1730
1731 /****************************************************************************
1732  Construct a reply to the incoming packet.
1733 ****************************************************************************/
1734
1735 static void construct_reply(struct smbXsrv_connection *xconn,
1736                             char *inbuf, int size, size_t unread_bytes,
1737                             uint32_t seqnum, bool encrypted,
1738                             struct smb_perfcount_data *deferred_pcd)
1739 {
1740         struct smbd_server_connection *sconn = xconn->client->sconn;
1741         struct smb_request *req;
1742
1743         if (!(req = talloc(talloc_tos(), struct smb_request))) {
1744                 smb_panic("could not allocate smb_request");
1745         }
1746
1747         if (!init_smb_request(req, sconn, xconn, (uint8_t *)inbuf, unread_bytes,
1748                               encrypted, seqnum)) {
1749                 exit_server_cleanly("Invalid SMB request");
1750         }
1751
1752         req->inbuf  = (uint8_t *)talloc_move(req, &inbuf);
1753
1754         /* we popped this message off the queue - keep original perf data */
1755         if (deferred_pcd)
1756                 req->pcd = *deferred_pcd;
1757         else {
1758                 SMB_PERFCOUNT_START(&req->pcd);
1759                 SMB_PERFCOUNT_SET_OP(&req->pcd, req->cmd);
1760                 SMB_PERFCOUNT_SET_MSGLEN_IN(&req->pcd, size);
1761         }
1762
1763         req->conn = switch_message(req->cmd, req);
1764
1765         if (req->outbuf == NULL) {
1766                 /*
1767                  * Request has suspended itself, will come
1768                  * back here.
1769                  */
1770                 return;
1771         }
1772         if (CVAL(req->outbuf,0) == 0) {
1773                 show_msg((char *)req->outbuf);
1774         }
1775         smb_request_done(req);
1776 }
1777
1778 static void construct_reply_chain(struct smbXsrv_connection *xconn,
1779                                   char *inbuf, int size, uint32_t seqnum,
1780                                   bool encrypted,
1781                                   struct smb_perfcount_data *deferred_pcd)
1782 {
1783         struct smb_request **reqs = NULL;
1784         struct smb_request *req;
1785         unsigned num_reqs;
1786         bool ok;
1787
1788         ok = smb1_parse_chain(xconn, (uint8_t *)inbuf, xconn, encrypted,
1789                               seqnum, &reqs, &num_reqs);
1790         if (!ok) {
1791                 char errbuf[smb_size];
1792                 error_packet(errbuf, 0, 0, NT_STATUS_INVALID_PARAMETER,
1793                              __LINE__, __FILE__);
1794                 if (!srv_send_smb(xconn, errbuf, true, seqnum, encrypted,
1795                                   NULL)) {
1796                         exit_server_cleanly("construct_reply_chain: "
1797                                             "srv_send_smb failed.");
1798                 }
1799                 return;
1800         }
1801
1802         req = reqs[0];
1803         req->inbuf = (uint8_t *)talloc_move(reqs, &inbuf);
1804
1805         req->conn = switch_message(req->cmd, req);
1806
1807         if (req->outbuf == NULL) {
1808                 /*
1809                  * Request has suspended itself, will come
1810                  * back here.
1811                  */
1812                 return;
1813         }
1814         smb_request_done(req);
1815 }
1816
1817 /*
1818  * To be called from an async SMB handler that is potentially chained
1819  * when it is finished for shipping.
1820  */
1821
1822 void smb_request_done(struct smb_request *req)
1823 {
1824         struct smb_request **reqs = NULL;
1825         struct smb_request *first_req;
1826         size_t i, num_reqs, next_index;
1827         NTSTATUS status;
1828
1829         if (req->chain == NULL) {
1830                 first_req = req;
1831                 goto shipit;
1832         }
1833
1834         reqs = req->chain;
1835         num_reqs = talloc_array_length(reqs);
1836
1837         for (i=0; i<num_reqs; i++) {
1838                 if (reqs[i] == req) {
1839                         break;
1840                 }
1841         }
1842         if (i == num_reqs) {
1843                 /*
1844                  * Invalid chain, should not happen
1845                  */
1846                 status = NT_STATUS_INTERNAL_ERROR;
1847                 goto error;
1848         }
1849         next_index = i+1;
1850
1851         while ((next_index < num_reqs) && (IVAL(req->outbuf, smb_rcls) == 0)) {
1852                 struct smb_request *next = reqs[next_index];
1853                 struct smbXsrv_tcon *tcon;
1854                 NTTIME now = timeval_to_nttime(&req->request_time);
1855
1856                 next->vuid = SVAL(req->outbuf, smb_uid);
1857                 next->tid  = SVAL(req->outbuf, smb_tid);
1858                 status = smb1srv_tcon_lookup(req->xconn, req->tid,
1859                                              now, &tcon);
1860                 if (NT_STATUS_IS_OK(status)) {
1861                         req->conn = tcon->compat;
1862                 } else {
1863                         req->conn = NULL;
1864                 }
1865                 next->chain_fsp = req->chain_fsp;
1866                 next->inbuf = req->inbuf;
1867
1868                 req = next;
1869                 req->conn = switch_message(req->cmd, req);
1870
1871                 if (req->outbuf == NULL) {
1872                         /*
1873                          * Request has suspended itself, will come
1874                          * back here.
1875                          */
1876                         return;
1877                 }
1878                 next_index += 1;
1879         }
1880
1881         first_req = reqs[0];
1882
1883         for (i=1; i<next_index; i++) {
1884                 bool ok;
1885
1886                 ok = smb_splice_chain(&first_req->outbuf, reqs[i]->outbuf);
1887                 if (!ok) {
1888                         status = NT_STATUS_INTERNAL_ERROR;
1889                         goto error;
1890                 }
1891         }
1892
1893         SSVAL(first_req->outbuf, smb_uid, SVAL(req->outbuf, smb_uid));
1894         SSVAL(first_req->outbuf, smb_tid, SVAL(req->outbuf, smb_tid));
1895
1896         /*
1897          * This scary statement intends to set the
1898          * FLAGS2_32_BIT_ERROR_CODES flg2 field in first_req->outbuf
1899          * to the value last_req->outbuf carries
1900          */
1901         SSVAL(first_req->outbuf, smb_flg2,
1902               (SVAL(first_req->outbuf, smb_flg2) & ~FLAGS2_32_BIT_ERROR_CODES)
1903               |(SVAL(req->outbuf, smb_flg2) & FLAGS2_32_BIT_ERROR_CODES));
1904
1905         /*
1906          * Transfer the error codes from the subrequest to the main one
1907          */
1908         SSVAL(first_req->outbuf, smb_rcls, SVAL(req->outbuf, smb_rcls));
1909         SSVAL(first_req->outbuf, smb_err,  SVAL(req->outbuf, smb_err));
1910
1911         _smb_setlen_large(
1912                 first_req->outbuf, talloc_get_size(first_req->outbuf) - 4);
1913
1914 shipit:
1915         if (!srv_send_smb(first_req->xconn,
1916                           (char *)first_req->outbuf,
1917                           true, first_req->seqnum+1,
1918                           IS_CONN_ENCRYPTED(req->conn)||first_req->encrypted,
1919                           &first_req->pcd)) {
1920                 exit_server_cleanly("construct_reply_chain: srv_send_smb "
1921                                     "failed.");
1922         }
1923         TALLOC_FREE(req);       /* non-chained case */
1924         TALLOC_FREE(reqs);      /* chained case */
1925         return;
1926
1927 error:
1928         {
1929                 char errbuf[smb_size];
1930                 error_packet(errbuf, 0, 0, status, __LINE__, __FILE__);
1931                 if (!srv_send_smb(req->xconn, errbuf, true,
1932                                   req->seqnum+1, req->encrypted,
1933                                   NULL)) {
1934                         exit_server_cleanly("construct_reply_chain: "
1935                                             "srv_send_smb failed.");
1936                 }
1937         }
1938         TALLOC_FREE(req);       /* non-chained case */
1939         TALLOC_FREE(reqs);      /* chained case */
1940 }
1941
1942 /****************************************************************************
1943  Process an smb from the client
1944 ****************************************************************************/
1945 static void process_smb(struct smbXsrv_connection *xconn,
1946                         uint8_t *inbuf, size_t nread, size_t unread_bytes,
1947                         uint32_t seqnum, bool encrypted,
1948                         struct smb_perfcount_data *deferred_pcd)
1949 {
1950         struct smbd_server_connection *sconn = xconn->client->sconn;
1951         int msg_type = CVAL(inbuf,0);
1952
1953         DO_PROFILE_INC(request);
1954
1955         DEBUG( 6, ( "got message type 0x%x of len 0x%x\n", msg_type,
1956                     smb_len(inbuf) ) );
1957         DEBUG(3, ("Transaction %d of length %d (%u toread)\n",
1958                   sconn->trans_num, (int)nread, (unsigned int)unread_bytes));
1959
1960         if (msg_type != NBSSmessage) {
1961                 /*
1962                  * NetBIOS session request, keepalive, etc.
1963                  */
1964                 reply_special(xconn, (char *)inbuf, nread);
1965                 goto done;
1966         }
1967
1968         if (sconn->using_smb2) {
1969                 /* At this point we're not really using smb2,
1970                  * we make the decision here.. */
1971                 if (smbd_is_smb2_header(inbuf, nread)) {
1972                         const uint8_t *inpdu = inbuf + NBT_HDR_SIZE;
1973                         size_t pdulen = nread - NBT_HDR_SIZE;
1974                         smbd_smb2_process_negprot(xconn, 0, inpdu, pdulen);
1975                         return;
1976                 }
1977                 if (nread >= smb_size && valid_smb_header(inbuf)
1978                                 && CVAL(inbuf, smb_com) != 0x72) {
1979                         /* This is a non-negprot SMB1 packet.
1980                            Disable SMB2 from now on. */
1981                         sconn->using_smb2 = false;
1982                 }
1983         }
1984
1985         /* Make sure this is an SMB packet. smb_size contains NetBIOS header
1986          * so subtract 4 from it. */
1987         if ((nread < (smb_size - 4)) || !valid_smb_header(inbuf)) {
1988                 DEBUG(2,("Non-SMB packet of length %d. Terminating server\n",
1989                          smb_len(inbuf)));
1990
1991                 /* special magic for immediate exit */
1992                 if ((nread == 9) &&
1993                     (IVAL(inbuf, 4) == 0x74697865) &&
1994                     lp_parm_bool(-1, "smbd", "suicide mode", false)) {
1995                         uint8_t exitcode = CVAL(inbuf, 8);
1996                         DEBUG(1, ("Exiting immediately with code %d\n",
1997                                   (int)exitcode));
1998                         exit(exitcode);
1999                 }
2000
2001                 exit_server_cleanly("Non-SMB packet");
2002         }
2003
2004         show_msg((char *)inbuf);
2005
2006         if ((unread_bytes == 0) && smb1_is_chain(inbuf)) {
2007                 construct_reply_chain(xconn, (char *)inbuf, nread,
2008                                       seqnum, encrypted, deferred_pcd);
2009         } else {
2010                 construct_reply(xconn, (char *)inbuf, nread, unread_bytes,
2011                                 seqnum, encrypted, deferred_pcd);
2012         }
2013
2014         sconn->trans_num++;
2015
2016 done:
2017         sconn->num_requests++;
2018
2019         /* The timeout_processing function isn't run nearly
2020            often enough to implement 'max log size' without
2021            overrunning the size of the file by many megabytes.
2022            This is especially true if we are running at debug
2023            level 10.  Checking every 50 SMBs is a nice
2024            tradeoff of performance vs log file size overrun. */
2025
2026         if ((sconn->num_requests % 50) == 0 &&
2027             need_to_check_log_size()) {
2028                 change_to_root_user();
2029                 check_log_size();
2030         }
2031 }
2032
2033 /****************************************************************************
2034  Return a string containing the function name of a SMB command.
2035 ****************************************************************************/
2036
2037 const char *smb_fn_name(int type)
2038 {
2039         const char *unknown_name = "SMBunknown";
2040
2041         if (smb_messages[type].name == NULL)
2042                 return(unknown_name);
2043
2044         return(smb_messages[type].name);
2045 }
2046
2047 /****************************************************************************
2048  Helper functions for contruct_reply.
2049 ****************************************************************************/
2050
2051 void add_to_common_flags2(uint32_t v)
2052 {
2053         common_flags2 |= v;
2054 }
2055
2056 void remove_from_common_flags2(uint32_t v)
2057 {
2058         common_flags2 &= ~v;
2059 }
2060
2061 static void construct_reply_common(uint8_t cmd, const uint8_t *inbuf,
2062                                    char *outbuf)
2063 {
2064         uint16_t in_flags2 = SVAL(inbuf,smb_flg2);
2065         uint16_t out_flags2 = common_flags2;
2066
2067         out_flags2 |= in_flags2 & FLAGS2_UNICODE_STRINGS;
2068         out_flags2 |= in_flags2 & FLAGS2_SMB_SECURITY_SIGNATURES;
2069         out_flags2 |= in_flags2 & FLAGS2_SMB_SECURITY_SIGNATURES_REQUIRED;
2070
2071         srv_set_message(outbuf,0,0,false);
2072
2073         SCVAL(outbuf, smb_com, cmd);
2074         SIVAL(outbuf,smb_rcls,0);
2075         SCVAL(outbuf,smb_flg, FLAG_REPLY | (CVAL(inbuf,smb_flg) & FLAG_CASELESS_PATHNAMES));
2076         SSVAL(outbuf,smb_flg2, out_flags2);
2077         memset(outbuf+smb_pidhigh,'\0',(smb_tid-smb_pidhigh));
2078         memcpy(outbuf+smb_ss_field, inbuf+smb_ss_field, 8);
2079
2080         SSVAL(outbuf,smb_tid,SVAL(inbuf,smb_tid));
2081         SSVAL(outbuf,smb_pid,SVAL(inbuf,smb_pid));
2082         SSVAL(outbuf,smb_pidhigh,SVAL(inbuf,smb_pidhigh));
2083         SSVAL(outbuf,smb_uid,SVAL(inbuf,smb_uid));
2084         SSVAL(outbuf,smb_mid,SVAL(inbuf,smb_mid));
2085 }
2086
2087 void construct_reply_common_req(struct smb_request *req, char *outbuf)
2088 {
2089         construct_reply_common(req->cmd, req->inbuf, outbuf);
2090 }
2091
2092 /**
2093  * @brief Find the smb_cmd offset of the last command pushed
2094  * @param[in] buf       The buffer we're building up
2095  * @retval              Where can we put our next andx cmd?
2096  *
2097  * While chaining requests, the "next" request we're looking at needs to put
2098  * its SMB_Command before the data the previous request already built up added
2099  * to the chain. Find the offset to the place where we have to put our cmd.
2100  */
2101
2102 static bool find_andx_cmd_ofs(uint8_t *buf, size_t *pofs)
2103 {
2104         uint8_t cmd;
2105         size_t ofs;
2106
2107         cmd = CVAL(buf, smb_com);
2108
2109         if (!is_andx_req(cmd)) {
2110                 return false;
2111         }
2112
2113         ofs = smb_vwv0;
2114
2115         while (CVAL(buf, ofs) != 0xff) {
2116
2117                 if (!is_andx_req(CVAL(buf, ofs))) {
2118                         return false;
2119                 }
2120
2121                 /*
2122                  * ofs is from start of smb header, so add the 4 length
2123                  * bytes. The next cmd is right after the wct field.
2124                  */
2125                 ofs = SVAL(buf, ofs+2) + 4 + 1;
2126
2127                 if (ofs+4 >= talloc_get_size(buf)) {
2128                         return false;
2129                 }
2130         }
2131
2132         *pofs = ofs;
2133         return true;
2134 }
2135
2136 /**
2137  * @brief Do the smb chaining at a buffer level
2138  * @param[in] poutbuf           Pointer to the talloc'ed buffer to be modified
2139  * @param[in] andx_buf          Buffer to be appended
2140  */
2141
2142 static bool smb_splice_chain(uint8_t **poutbuf, const uint8_t *andx_buf)
2143 {
2144         uint8_t smb_command     = CVAL(andx_buf, smb_com);
2145         uint8_t wct             = CVAL(andx_buf, smb_wct);
2146         const uint16_t *vwv     = (const uint16_t *)(andx_buf + smb_vwv);
2147         uint32_t num_bytes      = smb_buflen(andx_buf);
2148         const uint8_t *bytes    = (const uint8_t *)smb_buf_const(andx_buf);
2149
2150         uint8_t *outbuf;
2151         size_t old_size, new_size;
2152         size_t ofs;
2153         size_t chain_padding = 0;
2154         size_t andx_cmd_ofs;
2155
2156
2157         old_size = talloc_get_size(*poutbuf);
2158
2159         if ((old_size % 4) != 0) {
2160                 /*
2161                  * Align the wct field of subsequent requests to a 4-byte
2162                  * boundary
2163                  */
2164                 chain_padding = 4 - (old_size % 4);
2165         }
2166
2167         /*
2168          * After the old request comes the new wct field (1 byte), the vwv's
2169          * and the num_bytes field.
2170          */
2171
2172         new_size = old_size + chain_padding + 1 + wct * sizeof(uint16_t) + 2;
2173         new_size += num_bytes;
2174
2175         if ((smb_command != SMBwriteX) && (new_size > 0xffff)) {
2176                 DEBUG(1, ("smb_splice_chain: %u bytes won't fit\n",
2177                           (unsigned)new_size));
2178                 return false;
2179         }
2180
2181         outbuf = talloc_realloc(NULL, *poutbuf, uint8_t, new_size);
2182         if (outbuf == NULL) {
2183                 DEBUG(0, ("talloc failed\n"));
2184                 return false;
2185         }
2186         *poutbuf = outbuf;
2187
2188         if (!find_andx_cmd_ofs(outbuf, &andx_cmd_ofs)) {
2189                 DEBUG(1, ("invalid command chain\n"));
2190                 *poutbuf = talloc_realloc(NULL, *poutbuf, uint8_t, old_size);
2191                 return false;
2192         }
2193
2194         if (chain_padding != 0) {
2195                 memset(outbuf + old_size, 0, chain_padding);
2196                 old_size += chain_padding;
2197         }
2198
2199         SCVAL(outbuf, andx_cmd_ofs, smb_command);
2200         SSVAL(outbuf, andx_cmd_ofs + 2, old_size - 4);
2201
2202         ofs = old_size;
2203
2204         /*
2205          * Push the chained request:
2206          *
2207          * wct field
2208          */
2209
2210         SCVAL(outbuf, ofs, wct);
2211         ofs += 1;
2212
2213         /*
2214          * vwv array
2215          */
2216
2217         memcpy(outbuf + ofs, vwv, sizeof(uint16_t) * wct);
2218
2219         /*
2220          * HACK ALERT
2221          *
2222          * Read&X has an offset into its data buffer at
2223          * vwv[6]. reply_read_andx has no idea anymore that it's
2224          * running from within a chain, so we have to fix up the
2225          * offset here.
2226          *
2227          * Although it looks disgusting at this place, I want to keep
2228          * it here. The alternative would be to push knowledge about
2229          * the andx chain down into read&x again.
2230          */
2231
2232         if (smb_command == SMBreadX) {
2233                 uint8_t *bytes_addr;
2234
2235                 if (wct < 7) {
2236                         /*
2237                          * Invalid read&x response
2238                          */
2239                         return false;
2240                 }
2241
2242                 bytes_addr = outbuf + ofs        /* vwv start */
2243                         + sizeof(uint16_t) * wct /* vwv array */
2244                         + sizeof(uint16_t)       /* bcc */
2245                         + 1;                     /* padding byte */
2246
2247                 SSVAL(outbuf + ofs, 6 * sizeof(uint16_t),
2248                       bytes_addr - outbuf - 4);
2249         }
2250
2251         ofs += sizeof(uint16_t) * wct;
2252
2253         /*
2254          * bcc (byte count)
2255          */
2256
2257         SSVAL(outbuf, ofs, num_bytes);
2258         ofs += sizeof(uint16_t);
2259
2260         /*
2261          * The bytes field
2262          */
2263
2264         memcpy(outbuf + ofs, bytes, num_bytes);
2265
2266         return true;
2267 }
2268
2269 bool smb1_is_chain(const uint8_t *buf)
2270 {
2271         uint8_t cmd, wct, andx_cmd;
2272
2273         cmd = CVAL(buf, smb_com);
2274         if (!is_andx_req(cmd)) {
2275                 return false;
2276         }
2277         wct = CVAL(buf, smb_wct);
2278         if (wct < 2) {
2279                 return false;
2280         }
2281         andx_cmd = CVAL(buf, smb_vwv);
2282         return (andx_cmd != 0xFF);
2283 }
2284
2285 bool smb1_walk_chain(const uint8_t *buf,
2286                      bool (*fn)(uint8_t cmd,
2287                                 uint8_t wct, const uint16_t *vwv,
2288                                 uint16_t num_bytes, const uint8_t *bytes,
2289                                 void *private_data),
2290                      void *private_data)
2291 {
2292         size_t smblen = smb_len(buf);
2293         const char *smb_buf = smb_base(buf);
2294         uint8_t cmd, chain_cmd;
2295         uint8_t wct;
2296         const uint16_t *vwv;
2297         uint16_t num_bytes;
2298         const uint8_t *bytes;
2299
2300         cmd = CVAL(buf, smb_com);
2301         wct = CVAL(buf, smb_wct);
2302         vwv = (const uint16_t *)(buf + smb_vwv);
2303         num_bytes = smb_buflen(buf);
2304         bytes = (const uint8_t *)smb_buf_const(buf);
2305
2306         if (!fn(cmd, wct, vwv, num_bytes, bytes, private_data)) {
2307                 return false;
2308         }
2309
2310         if (!is_andx_req(cmd)) {
2311                 return true;
2312         }
2313         if (wct < 2) {
2314                 return false;
2315         }
2316
2317         chain_cmd = CVAL(vwv, 0);
2318
2319         while (chain_cmd != 0xff) {
2320                 uint32_t chain_offset;  /* uint32_t to avoid overflow */
2321                 size_t length_needed;
2322                 ptrdiff_t vwv_offset;
2323
2324                 chain_offset = SVAL(vwv+1, 0);
2325
2326                 /*
2327                  * Check if the client tries to fool us. The chain
2328                  * offset needs to point beyond the current request in
2329                  * the chain, it needs to strictly grow. Otherwise we
2330                  * might be tricked into an endless loop always
2331                  * processing the same request over and over again. We
2332                  * used to assume that vwv and the byte buffer array
2333                  * in a chain are always attached, but OS/2 the
2334                  * Write&X/Read&X chain puts the Read&X vwv array
2335                  * right behind the Write&X vwv chain. The Write&X bcc
2336                  * array is put behind the Read&X vwv array. So now we
2337                  * check whether the chain offset points strictly
2338                  * behind the previous vwv array. req->buf points
2339                  * right after the vwv array of the previous
2340                  * request. See
2341                  * https://bugzilla.samba.org/show_bug.cgi?id=8360 for
2342                  * more information.
2343                  */
2344
2345                 vwv_offset = ((const char *)vwv - smb_buf);
2346                 if (chain_offset <= vwv_offset) {
2347                         return false;
2348                 }
2349
2350                 /*
2351                  * Next check: Make sure the chain offset does not
2352                  * point beyond the overall smb request length.
2353                  */
2354
2355                 length_needed = chain_offset+1; /* wct */
2356                 if (length_needed > smblen) {
2357                         return false;
2358                 }
2359
2360                 /*
2361                  * Now comes the pointer magic. Goal here is to set up
2362                  * vwv and buf correctly again. The chain offset (the
2363                  * former vwv[1]) points at the new wct field.
2364                  */
2365
2366                 wct = CVAL(smb_buf, chain_offset);
2367
2368                 if (is_andx_req(chain_cmd) && (wct < 2)) {
2369                         return false;
2370                 }
2371
2372                 /*
2373                  * Next consistency check: Make the new vwv array fits
2374                  * in the overall smb request.
2375                  */
2376
2377                 length_needed += (wct+1)*sizeof(uint16_t); /* vwv+buflen */
2378                 if (length_needed > smblen) {
2379                         return false;
2380                 }
2381                 vwv = (const uint16_t *)(smb_buf + chain_offset + 1);
2382
2383                 /*
2384                  * Now grab the new byte buffer....
2385                  */
2386
2387                 num_bytes = SVAL(vwv+wct, 0);
2388
2389                 /*
2390                  * .. and check that it fits.
2391                  */
2392
2393                 length_needed += num_bytes;
2394                 if (length_needed > smblen) {
2395                         return false;
2396                 }
2397                 bytes = (const uint8_t *)(vwv+wct+1);
2398
2399                 if (!fn(chain_cmd, wct, vwv, num_bytes, bytes, private_data)) {
2400                         return false;
2401                 }
2402
2403                 if (!is_andx_req(chain_cmd)) {
2404                         return true;
2405                 }
2406                 chain_cmd = CVAL(vwv, 0);
2407         }
2408         return true;
2409 }
2410
2411 static bool smb1_chain_length_cb(uint8_t cmd,
2412                                  uint8_t wct, const uint16_t *vwv,
2413                                  uint16_t num_bytes, const uint8_t *bytes,
2414                                  void *private_data)
2415 {
2416         unsigned *count = (unsigned *)private_data;
2417         *count += 1;
2418         return true;
2419 }
2420
2421 unsigned smb1_chain_length(const uint8_t *buf)
2422 {
2423         unsigned count = 0;
2424
2425         if (!smb1_walk_chain(buf, smb1_chain_length_cb, &count)) {
2426                 return 0;
2427         }
2428         return count;
2429 }
2430
2431 struct smb1_parse_chain_state {
2432         TALLOC_CTX *mem_ctx;
2433         const uint8_t *buf;
2434         struct smbd_server_connection *sconn;
2435         struct smbXsrv_connection *xconn;
2436         bool encrypted;
2437         uint32_t seqnum;
2438
2439         struct smb_request **reqs;
2440         unsigned num_reqs;
2441 };
2442
2443 static bool smb1_parse_chain_cb(uint8_t cmd,
2444                                 uint8_t wct, const uint16_t *vwv,
2445                                 uint16_t num_bytes, const uint8_t *bytes,
2446                                 void *private_data)
2447 {
2448         struct smb1_parse_chain_state *state =
2449                 (struct smb1_parse_chain_state *)private_data;
2450         struct smb_request **reqs;
2451         struct smb_request *req;
2452         bool ok;
2453
2454         reqs = talloc_realloc(state->mem_ctx, state->reqs,
2455                               struct smb_request *, state->num_reqs+1);
2456         if (reqs == NULL) {
2457                 return false;
2458         }
2459         state->reqs = reqs;
2460
2461         req = talloc(reqs, struct smb_request);
2462         if (req == NULL) {
2463                 return false;
2464         }
2465
2466         ok = init_smb_request(req, state->sconn, state->xconn, state->buf, 0,
2467                               state->encrypted, state->seqnum);
2468         if (!ok) {
2469                 return false;
2470         }
2471         req->cmd = cmd;
2472         req->wct = wct;
2473         req->vwv = vwv;
2474         req->buflen = num_bytes;
2475         req->buf = bytes;
2476
2477         reqs[state->num_reqs] = req;
2478         state->num_reqs += 1;
2479         return true;
2480 }
2481
2482 bool smb1_parse_chain(TALLOC_CTX *mem_ctx, const uint8_t *buf,
2483                       struct smbXsrv_connection *xconn,
2484                       bool encrypted, uint32_t seqnum,
2485                       struct smb_request ***reqs, unsigned *num_reqs)
2486 {
2487         struct smbd_server_connection *sconn = NULL;
2488         struct smb1_parse_chain_state state;
2489         unsigned i;
2490
2491         if (xconn != NULL) {
2492                 sconn = xconn->client->sconn;
2493         }
2494
2495         state.mem_ctx = mem_ctx;
2496         state.buf = buf;
2497         state.sconn = sconn;
2498         state.xconn = xconn;
2499         state.encrypted = encrypted;
2500         state.seqnum = seqnum;
2501         state.reqs = NULL;
2502         state.num_reqs = 0;
2503
2504         if (!smb1_walk_chain(buf, smb1_parse_chain_cb, &state)) {
2505                 TALLOC_FREE(state.reqs);
2506                 return false;
2507         }
2508         for (i=0; i<state.num_reqs; i++) {
2509                 state.reqs[i]->chain = state.reqs;
2510         }
2511         *reqs = state.reqs;
2512         *num_reqs = state.num_reqs;
2513         return true;
2514 }
2515
2516 /****************************************************************************
2517  Check if services need reloading.
2518 ****************************************************************************/
2519
2520 static void check_reload(struct smbd_server_connection *sconn, time_t t)
2521 {
2522
2523         if (last_smb_conf_reload_time == 0) {
2524                 last_smb_conf_reload_time = t;
2525         }
2526
2527         if (t >= last_smb_conf_reload_time+SMBD_RELOAD_CHECK) {
2528                 reload_services(sconn, conn_snum_used, true);
2529                 last_smb_conf_reload_time = t;
2530         }
2531 }
2532
2533 static bool fd_is_readable(int fd)
2534 {
2535         int ret, revents;
2536
2537         ret = poll_one_fd(fd, POLLIN|POLLHUP, 0, &revents);
2538
2539         return ((ret > 0) && ((revents & (POLLIN|POLLHUP|POLLERR)) != 0));
2540
2541 }
2542
2543 static void smbd_server_connection_write_handler(
2544         struct smbXsrv_connection *xconn)
2545 {
2546         /* TODO: make write nonblocking */
2547 }
2548
2549 static void smbd_server_connection_read_handler(
2550         struct smbXsrv_connection *xconn, int fd)
2551 {
2552         uint8_t *inbuf = NULL;
2553         size_t inbuf_len = 0;
2554         size_t unread_bytes = 0;
2555         bool encrypted = false;
2556         TALLOC_CTX *mem_ctx = talloc_tos();
2557         NTSTATUS status;
2558         uint32_t seqnum;
2559
2560         bool async_echo = lp_async_smb_echo_handler();
2561         bool from_client = false;
2562
2563         if (async_echo) {
2564                 if (fd_is_readable(xconn->smb1.echo_handler.trusted_fd)) {
2565                         /*
2566                          * This is the super-ugly hack to prefer the packets
2567                          * forwarded by the echo handler over the ones by the
2568                          * client directly
2569                          */
2570                         fd = xconn->smb1.echo_handler.trusted_fd;
2571                 }
2572         }
2573
2574         from_client = (xconn->transport.sock == fd);
2575
2576         if (async_echo && from_client) {
2577                 smbd_lock_socket(xconn);
2578
2579                 if (!fd_is_readable(fd)) {
2580                         DEBUG(10,("the echo listener was faster\n"));
2581                         smbd_unlock_socket(xconn);
2582                         return;
2583                 }
2584         }
2585
2586         /* TODO: make this completely nonblocking */
2587         status = receive_smb_talloc(mem_ctx, xconn, fd,
2588                                     (char **)(void *)&inbuf,
2589                                     0, /* timeout */
2590                                     &unread_bytes,
2591                                     &encrypted,
2592                                     &inbuf_len, &seqnum,
2593                                     !from_client /* trusted channel */);
2594
2595         if (async_echo && from_client) {
2596                 smbd_unlock_socket(xconn);
2597         }
2598
2599         if (NT_STATUS_EQUAL(status, NT_STATUS_RETRY)) {
2600                 goto process;
2601         }
2602         if (NT_STATUS_IS_ERR(status)) {
2603                 exit_server_cleanly("failed to receive smb request");
2604         }
2605         if (!NT_STATUS_IS_OK(status)) {
2606                 return;
2607         }
2608
2609 process:
2610         process_smb(xconn, inbuf, inbuf_len, unread_bytes,
2611                     seqnum, encrypted, NULL);
2612 }
2613
2614 static void smbd_server_connection_handler(struct tevent_context *ev,
2615                                            struct tevent_fd *fde,
2616                                            uint16_t flags,
2617                                            void *private_data)
2618 {
2619         struct smbXsrv_connection *xconn =
2620                 talloc_get_type_abort(private_data,
2621                 struct smbXsrv_connection);
2622
2623         if (!NT_STATUS_IS_OK(xconn->transport.status)) {
2624                 /*
2625                  * we're not supposed to do any io
2626                  */
2627                 TEVENT_FD_NOT_READABLE(xconn->transport.fde);
2628                 TEVENT_FD_NOT_WRITEABLE(xconn->transport.fde);
2629                 return;
2630         }
2631
2632         if (flags & TEVENT_FD_WRITE) {
2633                 smbd_server_connection_write_handler(xconn);
2634                 return;
2635         }
2636         if (flags & TEVENT_FD_READ) {
2637                 smbd_server_connection_read_handler(xconn, xconn->transport.sock);
2638                 return;
2639         }
2640 }
2641
2642 static void smbd_server_echo_handler(struct tevent_context *ev,
2643                                      struct tevent_fd *fde,
2644                                      uint16_t flags,
2645                                      void *private_data)
2646 {
2647         struct smbXsrv_connection *xconn =
2648                 talloc_get_type_abort(private_data,
2649                 struct smbXsrv_connection);
2650
2651         if (!NT_STATUS_IS_OK(xconn->transport.status)) {
2652                 /*
2653                  * we're not supposed to do any io
2654                  */
2655                 TEVENT_FD_NOT_READABLE(xconn->smb1.echo_handler.trusted_fde);
2656                 TEVENT_FD_NOT_WRITEABLE(xconn->smb1.echo_handler.trusted_fde);
2657                 return;
2658         }
2659
2660         if (flags & TEVENT_FD_WRITE) {
2661                 smbd_server_connection_write_handler(xconn);
2662                 return;
2663         }
2664         if (flags & TEVENT_FD_READ) {
2665                 smbd_server_connection_read_handler(
2666                         xconn, xconn->smb1.echo_handler.trusted_fd);
2667                 return;
2668         }
2669 }
2670
2671 struct smbd_release_ip_state {
2672         struct smbXsrv_connection *xconn;
2673         struct tevent_immediate *im;
2674         char addr[INET6_ADDRSTRLEN];
2675 };
2676
2677 static void smbd_release_ip_immediate(struct tevent_context *ctx,
2678                                       struct tevent_immediate *im,
2679                                       void *private_data)
2680 {
2681         struct smbd_release_ip_state *state =
2682                 talloc_get_type_abort(private_data,
2683                 struct smbd_release_ip_state);
2684         struct smbXsrv_connection *xconn = state->xconn;
2685
2686         if (!NT_STATUS_EQUAL(xconn->transport.status, NT_STATUS_ADDRESS_CLOSED)) {
2687                 /*
2688                  * smbd_server_connection_terminate() already triggered ?
2689                  */
2690                 return;
2691         }
2692
2693         smbd_server_connection_terminate(xconn, "CTDB_SRVID_RELEASE_IP");
2694 }
2695
2696 /****************************************************************************
2697 received when we should release a specific IP
2698 ****************************************************************************/
2699 static int release_ip(struct tevent_context *ev,
2700                       uint32_t src_vnn, uint32_t dst_vnn,
2701                       uint64_t dst_srvid,
2702                       const uint8_t *msg, size_t msglen,
2703                       void *private_data)
2704 {
2705         struct smbd_release_ip_state *state =
2706                 talloc_get_type_abort(private_data,
2707                 struct smbd_release_ip_state);
2708         struct smbXsrv_connection *xconn = state->xconn;
2709         const char *ip;
2710         const char *addr = state->addr;
2711         const char *p = addr;
2712
2713         if (msglen == 0) {
2714                 return 0;
2715         }
2716         if (msg[msglen-1] != '\0') {
2717                 return 0;
2718         }
2719
2720         ip = (const char *)msg;
2721
2722         if (!NT_STATUS_IS_OK(xconn->transport.status)) {
2723                 /* avoid recursion */
2724                 return 0;
2725         }
2726
2727         if (strncmp("::ffff:", addr, 7) == 0) {
2728                 p = addr + 7;
2729         }
2730
2731         DEBUG(10, ("Got release IP message for %s, "
2732                    "our address is %s\n", ip, p));
2733
2734         if ((strcmp(p, ip) == 0) || ((p != addr) && strcmp(addr, ip) == 0)) {
2735                 DEBUG(0,("Got release IP message for our IP %s - exiting immediately\n",
2736                         ip));
2737                 /*
2738                  * With SMB2 we should do a clean disconnect,
2739                  * the previous_session_id in the session setup
2740                  * will cleanup the old session, tcons and opens.
2741                  *
2742                  * A clean disconnect is needed in order to support
2743                  * durable handles.
2744                  *
2745                  * Note: typically this is never triggered
2746                  *       as we got a TCP RST (triggered by ctdb event scripts)
2747                  *       before we get CTDB_SRVID_RELEASE_IP.
2748                  *
2749                  * We used to call _exit(1) here, but as this was mostly never
2750                  * triggered and has implication on our process model,
2751                  * we can just use smbd_server_connection_terminate()
2752                  * (also for SMB1).
2753                  *
2754                  * We don't call smbd_server_connection_terminate() directly
2755                  * as we might be called from within ctdbd_migrate(),
2756                  * we need to defer our action to the next event loop
2757                  */
2758                 tevent_schedule_immediate(state->im, xconn->ev_ctx,
2759                                           smbd_release_ip_immediate, state);
2760
2761                 /*
2762                  * Make sure we don't get any io on the connection.
2763                  */
2764                 xconn->transport.status = NT_STATUS_ADDRESS_CLOSED;
2765                 return EADDRNOTAVAIL;
2766         }
2767
2768         return 0;
2769 }
2770
2771 static NTSTATUS smbd_register_ips(struct smbXsrv_connection *xconn,
2772                                   struct sockaddr_storage *srv,
2773                                   struct sockaddr_storage *clnt)
2774 {
2775         struct smbd_release_ip_state *state;
2776         struct ctdbd_connection *cconn;
2777         int ret;
2778
2779         cconn = messaging_ctdb_connection();
2780         if (cconn == NULL) {
2781                 return NT_STATUS_NO_MEMORY;
2782         }
2783
2784         state = talloc_zero(xconn, struct smbd_release_ip_state);
2785         if (state == NULL) {
2786                 return NT_STATUS_NO_MEMORY;
2787         }
2788         state->xconn = xconn;
2789         state->im = tevent_create_immediate(state);
2790         if (state->im == NULL) {
2791                 return NT_STATUS_NO_MEMORY;
2792         }
2793         if (print_sockaddr(state->addr, sizeof(state->addr), srv) == NULL) {
2794                 return NT_STATUS_NO_MEMORY;
2795         }
2796
2797         ret = ctdbd_register_ips(cconn, srv, clnt, release_ip, state);
2798         if (ret != 0) {
2799                 return map_nt_error_from_unix(ret);
2800         }
2801         return NT_STATUS_OK;
2802 }
2803
2804 static void msg_kill_client_ip(struct messaging_context *msg_ctx,
2805                                   void *private_data, uint32_t msg_type,
2806                                   struct server_id server_id, DATA_BLOB *data)
2807 {
2808         struct smbd_server_connection *sconn = talloc_get_type_abort(
2809                 private_data, struct smbd_server_connection);
2810         const char *ip = (char *) data->data;
2811         char *client_ip;
2812
2813         DBG_DEBUG("Got kill request for client IP %s\n", ip);
2814
2815         client_ip = tsocket_address_inet_addr_string(sconn->remote_address,
2816                                                      talloc_tos());
2817         if (client_ip == NULL) {
2818                 return;
2819         }
2820
2821         if (strequal(ip, client_ip)) {
2822                 DBG_WARNING("Got kill client message for %s - "
2823                             "exiting immediately\n", ip);
2824                 exit_server_cleanly("Forced disconnect for client");
2825         }
2826
2827         TALLOC_FREE(client_ip);
2828 }
2829
2830 /*
2831  * Send keepalive packets to our client
2832  */
2833 static bool keepalive_fn(const struct timeval *now, void *private_data)
2834 {
2835         struct smbd_server_connection *sconn = talloc_get_type_abort(
2836                 private_data, struct smbd_server_connection);
2837         struct smbXsrv_connection *xconn = NULL;
2838         bool ret;
2839
2840         if (sconn->using_smb2) {
2841                 /* Don't do keepalives on an SMB2 connection. */
2842                 return false;
2843         }
2844
2845         /*
2846          * With SMB1 we only have 1 connection
2847          */
2848         xconn = sconn->client->connections;
2849         smbd_lock_socket(xconn);
2850         ret = send_keepalive(xconn->transport.sock);
2851         smbd_unlock_socket(xconn);
2852
2853         if (!ret) {
2854                 int saved_errno = errno;
2855                 /*
2856                  * Try and give an error message saying what
2857                  * client failed.
2858                  */
2859                 DEBUG(0, ("send_keepalive failed for client %s. "
2860                           "Error %s - exiting\n",
2861                           smbXsrv_connection_dbg(xconn),
2862                           strerror(saved_errno)));
2863                 errno = saved_errno;
2864                 return False;
2865         }
2866         return True;
2867 }
2868
2869 /*
2870  * Do the recurring check if we're idle
2871  */
2872 static bool deadtime_fn(const struct timeval *now, void *private_data)
2873 {
2874         struct smbd_server_connection *sconn =
2875                 (struct smbd_server_connection *)private_data;
2876
2877         if ((conn_num_open(sconn) == 0)
2878             || (conn_idle_all(sconn, now->tv_sec))) {
2879                 DEBUG( 2, ( "Closing idle connection\n" ) );
2880                 messaging_send(sconn->msg_ctx,
2881                                messaging_server_id(sconn->msg_ctx),
2882                                MSG_SHUTDOWN, &data_blob_null);
2883                 return False;
2884         }
2885
2886         return True;
2887 }
2888
2889 /*
2890  * Do the recurring log file and smb.conf reload checks.
2891  */
2892
2893 static bool housekeeping_fn(const struct timeval *now, void *private_data)
2894 {
2895         struct smbd_server_connection *sconn = talloc_get_type_abort(
2896                 private_data, struct smbd_server_connection);
2897
2898         DEBUG(5, ("housekeeping\n"));
2899
2900         change_to_root_user();
2901
2902         /* update printer queue caches if necessary */
2903         update_monitored_printq_cache(sconn->msg_ctx);
2904
2905         /* check if we need to reload services */
2906         check_reload(sconn, time_mono(NULL));
2907
2908         /*
2909          * Force a log file check.
2910          */
2911         force_check_log_size();
2912         check_log_size();
2913         return true;
2914 }
2915
2916 /*
2917  * Read an smb packet in the echo handler child, giving the parent
2918  * smbd one second to react once the socket becomes readable.
2919  */
2920
2921 struct smbd_echo_read_state {
2922         struct tevent_context *ev;
2923         struct smbXsrv_connection *xconn;
2924
2925         char *buf;
2926         size_t buflen;
2927         uint32_t seqnum;
2928 };
2929
2930 static void smbd_echo_read_readable(struct tevent_req *subreq);
2931 static void smbd_echo_read_waited(struct tevent_req *subreq);
2932
2933 static struct tevent_req *smbd_echo_read_send(
2934         TALLOC_CTX *mem_ctx, struct tevent_context *ev,
2935         struct smbXsrv_connection *xconn)
2936 {
2937         struct tevent_req *req, *subreq;
2938         struct smbd_echo_read_state *state;
2939
2940         req = tevent_req_create(mem_ctx, &state,
2941                                 struct smbd_echo_read_state);
2942         if (req == NULL) {
2943                 return NULL;
2944         }
2945         state->ev = ev;
2946         state->xconn = xconn;
2947
2948         subreq = wait_for_read_send(state, ev, xconn->transport.sock, false);
2949         if (tevent_req_nomem(subreq, req)) {
2950                 return tevent_req_post(req, ev);
2951         }
2952         tevent_req_set_callback(subreq, smbd_echo_read_readable, req);
2953         return req;
2954 }
2955
2956 static void smbd_echo_read_readable(struct tevent_req *subreq)
2957 {
2958         struct tevent_req *req = tevent_req_callback_data(
2959                 subreq, struct tevent_req);
2960         struct smbd_echo_read_state *state = tevent_req_data(
2961                 req, struct smbd_echo_read_state);
2962         bool ok;
2963         int err;
2964
2965         ok = wait_for_read_recv(subreq, &err);
2966         TALLOC_FREE(subreq);
2967         if (!ok) {
2968                 tevent_req_nterror(req, map_nt_error_from_unix(err));
2969                 return;
2970         }
2971
2972         /*
2973          * Give the parent smbd one second to step in
2974          */
2975
2976         subreq = tevent_wakeup_send(
2977                 state, state->ev, timeval_current_ofs(1, 0));
2978         if (tevent_req_nomem(subreq, req)) {
2979                 return;
2980         }
2981         tevent_req_set_callback(subreq, smbd_echo_read_waited, req);
2982 }
2983
2984 static void smbd_echo_read_waited(struct tevent_req *subreq)
2985 {
2986         struct tevent_req *req = tevent_req_callback_data(
2987                 subreq, struct tevent_req);
2988         struct smbd_echo_read_state *state = tevent_req_data(
2989                 req, struct smbd_echo_read_state);
2990         struct smbXsrv_connection *xconn = state->xconn;
2991         bool ok;
2992         NTSTATUS status;
2993         size_t unread = 0;
2994         bool encrypted;
2995
2996         ok = tevent_wakeup_recv(subreq);
2997         TALLOC_FREE(subreq);
2998         if (!ok) {
2999                 tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
3000                 return;
3001         }
3002
3003         ok = smbd_lock_socket_internal(xconn);
3004         if (!ok) {
3005                 tevent_req_nterror(req, map_nt_error_from_unix(errno));
3006                 DEBUG(0, ("%s: failed to lock socket\n", __location__));
3007                 return;
3008         }
3009
3010         if (!fd_is_readable(xconn->transport.sock)) {
3011                 DEBUG(10,("echo_handler[%d] the parent smbd was faster\n",
3012                           (int)getpid()));
3013
3014                 ok = smbd_unlock_socket_internal(xconn);
3015                 if (!ok) {
3016                         tevent_req_nterror(req, map_nt_error_from_unix(errno));
3017                         DEBUG(1, ("%s: failed to unlock socket\n",
3018                                 __location__));
3019                         return;
3020                 }
3021
3022                 subreq = wait_for_read_send(state, state->ev,
3023                                             xconn->transport.sock, false);
3024                 if (tevent_req_nomem(subreq, req)) {
3025                         return;
3026                 }
3027                 tevent_req_set_callback(subreq, smbd_echo_read_readable, req);
3028                 return;
3029         }
3030
3031         status = receive_smb_talloc(state, xconn,
3032                                     xconn->transport.sock,
3033                                     &state->buf,
3034                                     0 /* timeout */,
3035                                     &unread,
3036                                     &encrypted,
3037                                     &state->buflen,
3038                                     &state->seqnum,
3039                                     false /* trusted_channel*/);
3040
3041         if (tevent_req_nterror(req, status)) {
3042                 tevent_req_nterror(req, status);
3043                 DEBUG(1, ("echo_handler[%d]: receive_smb_raw_talloc failed: %s\n",
3044                           (int)getpid(), nt_errstr(status)));
3045                 return;
3046         }
3047
3048         ok = smbd_unlock_socket_internal(xconn);
3049         if (!ok) {
3050                 tevent_req_nterror(req, map_nt_error_from_unix(errno));
3051                 DEBUG(1, ("%s: failed to unlock socket\n", __location__));
3052                 return;
3053         }
3054         tevent_req_done(req);
3055 }
3056
3057 static NTSTATUS smbd_echo_read_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
3058                                     char **pbuf, size_t *pbuflen, uint32_t *pseqnum)
3059 {
3060         struct smbd_echo_read_state *state = tevent_req_data(
3061                 req, struct smbd_echo_read_state);
3062         NTSTATUS status;
3063
3064         if (tevent_req_is_nterror(req, &status)) {
3065                 return status;
3066         }
3067         *pbuf = talloc_move(mem_ctx, &state->buf);
3068         *pbuflen = state->buflen;
3069         *pseqnum = state->seqnum;
3070         return NT_STATUS_OK;
3071 }
3072
3073 struct smbd_echo_state {
3074         struct tevent_context *ev;
3075         struct iovec *pending;
3076         struct smbd_server_connection *sconn;
3077         struct smbXsrv_connection *xconn;
3078         int parent_pipe;
3079
3080         struct tevent_fd *parent_fde;
3081
3082         struct tevent_req *write_req;
3083 };
3084
3085 static void smbd_echo_writer_done(struct tevent_req *req);
3086
3087 static void smbd_echo_activate_writer(struct smbd_echo_state *state)
3088 {
3089         int num_pending;
3090
3091         if (state->write_req != NULL) {
3092                 return;
3093         }
3094
3095         num_pending = talloc_array_length(state->pending);
3096         if (num_pending == 0) {
3097                 return;
3098         }
3099
3100         state->write_req = writev_send(state, state->ev, NULL,
3101                                        state->parent_pipe, false,
3102                                        state->pending, num_pending);
3103         if (state->write_req == NULL) {
3104                 DEBUG(1, ("writev_send failed\n"));
3105                 exit(1);
3106         }
3107
3108         talloc_steal(state->write_req, state->pending);
3109         state->pending = NULL;
3110
3111         tevent_req_set_callback(state->write_req, smbd_echo_writer_done,
3112                                 state);
3113 }
3114
3115 static void smbd_echo_writer_done(struct tevent_req *req)
3116 {
3117         struct smbd_echo_state *state = tevent_req_callback_data(
3118                 req, struct smbd_echo_state);
3119         ssize_t written;
3120         int err;
3121
3122         written = writev_recv(req, &err);
3123         TALLOC_FREE(req);
3124         state->write_req = NULL;
3125         if (written == -1) {
3126                 DEBUG(1, ("writev to parent failed: %s\n", strerror(err)));
3127                 exit(1);
3128         }
3129         DEBUG(10,("echo_handler[%d]: forwarded pdu to main\n", (int)getpid()));
3130         smbd_echo_activate_writer(state);
3131 }
3132
3133 static bool smbd_echo_reply(struct smbd_echo_state *state,
3134                             uint8_t *inbuf, size_t inbuf_len,
3135                             uint32_t seqnum)
3136 {
3137         struct smb_request req;
3138         uint16_t num_replies;
3139         char *outbuf;
3140         bool ok;
3141
3142         if ((inbuf_len == 4) && (CVAL(inbuf, 0) == NBSSkeepalive)) {
3143                 DEBUG(10, ("Got netbios keepalive\n"));
3144                 /*
3145                  * Just swallow it
3146                  */
3147                 return true;
3148         }
3149
3150         if (inbuf_len < smb_size) {
3151                 DEBUG(10, ("Got short packet: %d bytes\n", (int)inbuf_len));
3152                 return false;
3153         }
3154         if (!valid_smb_header(inbuf)) {
3155                 DEBUG(10, ("Got invalid SMB header\n"));
3156                 return false;
3157         }
3158
3159         if (!init_smb_request(&req, state->sconn, state->xconn, inbuf, 0, false,
3160                               seqnum)) {
3161                 return false;
3162         }
3163         req.inbuf = inbuf;
3164
3165         DEBUG(10, ("smbecho handler got cmd %d (%s)\n", (int)req.cmd,
3166                    smb_messages[req.cmd].name
3167                    ? smb_messages[req.cmd].name : "unknown"));
3168
3169         if (req.cmd != SMBecho) {
3170                 return false;
3171         }
3172         if (req.wct < 1) {
3173                 return false;
3174         }
3175
3176         num_replies = SVAL(req.vwv+0, 0);
3177         if (num_replies != 1) {
3178                 /* Not a Windows "Hey, you're still there?" request */
3179                 return false;
3180         }
3181
3182         if (!create_outbuf(talloc_tos(), &req, req.inbuf, &outbuf,
3183                            1, req.buflen)) {
3184                 DEBUG(10, ("create_outbuf failed\n"));
3185                 return false;
3186         }
3187         req.outbuf = (uint8_t *)outbuf;
3188
3189         SSVAL(req.outbuf, smb_vwv0, num_replies);
3190
3191         if (req.buflen > 0) {
3192                 memcpy(smb_buf(req.outbuf), req.buf, req.buflen);
3193         }
3194
3195         ok = srv_send_smb(req.xconn,
3196                           (char *)outbuf,
3197                           true, seqnum+1,
3198                           false, &req.pcd);
3199         TALLOC_FREE(outbuf);
3200         if (!ok) {
3201                 exit(1);
3202         }
3203
3204         return true;
3205 }
3206
3207 static void smbd_echo_exit(struct tevent_context *ev,
3208                            struct tevent_fd *fde, uint16_t flags,
3209                            void *private_data)
3210 {
3211         DEBUG(2, ("smbd_echo_exit: lost connection to parent\n"));
3212         exit(0);
3213 }
3214
3215 static void smbd_echo_got_packet(struct tevent_req *req);
3216
3217 static void smbd_echo_loop(struct smbXsrv_connection *xconn,
3218                            int parent_pipe)
3219 {
3220         struct smbd_echo_state *state;
3221         struct tevent_req *read_req;
3222
3223         state = talloc_zero(xconn, struct smbd_echo_state);
3224         if (state == NULL) {
3225                 DEBUG(1, ("talloc failed\n"));
3226                 return;
3227         }
3228         state->xconn = xconn;
3229         state->parent_pipe = parent_pipe;
3230         state->ev = samba_tevent_context_init(state);
3231         if (state->ev == NULL) {
3232                 DEBUG(1, ("samba_tevent_context_init failed\n"));
3233                 TALLOC_FREE(state);
3234                 return;
3235         }
3236         state->parent_fde = tevent_add_fd(state->ev, state, parent_pipe,
3237                                         TEVENT_FD_READ, smbd_echo_exit,
3238                                         state);
3239         if (state->parent_fde == NULL) {
3240                 DEBUG(1, ("tevent_add_fd failed\n"));
3241                 TALLOC_FREE(state);
3242                 return;
3243         }
3244
3245         read_req = smbd_echo_read_send(state, state->ev, xconn);
3246         if (read_req == NULL) {
3247                 DEBUG(1, ("smbd_echo_read_send failed\n"));
3248                 TALLOC_FREE(state);
3249                 return;
3250         }
3251         tevent_req_set_callback(read_req, smbd_echo_got_packet, state);
3252
3253         while (true) {
3254                 if (tevent_loop_once(state->ev) == -1) {
3255                         DEBUG(1, ("tevent_loop_once failed: %s\n",
3256                                   strerror(errno)));
3257                         break;
3258                 }
3259         }
3260         TALLOC_FREE(state);
3261 }
3262
3263 static void smbd_echo_got_packet(struct tevent_req *req)
3264 {
3265         struct smbd_echo_state *state = tevent_req_callback_data(
3266                 req, struct smbd_echo_state);
3267         NTSTATUS status;
3268         char *buf = NULL;
3269         size_t buflen = 0;
3270         uint32_t seqnum = 0;
3271         bool reply;
3272
3273         status = smbd_echo_read_recv(req, state, &buf, &buflen, &seqnum);
3274         TALLOC_FREE(req);
3275         if (!NT_STATUS_IS_OK(status)) {
3276                 DEBUG(1, ("smbd_echo_read_recv returned %s\n",
3277                           nt_errstr(status)));
3278                 exit(1);
3279         }
3280
3281         reply = smbd_echo_reply(state, (uint8_t *)buf, buflen, seqnum);
3282         if (!reply) {
3283                 size_t num_pending;
3284                 struct iovec *tmp;
3285                 struct iovec *iov;
3286
3287                 num_pending = talloc_array_length(state->pending);
3288                 tmp = talloc_realloc(state, state->pending, struct iovec,
3289                                      num_pending+1);
3290                 if (tmp == NULL) {
3291                         DEBUG(1, ("talloc_realloc failed\n"));
3292                         exit(1);
3293                 }
3294                 state->pending = tmp;
3295
3296                 if (buflen >= smb_size) {
3297                         /*
3298                          * place the seqnum in the packet so that the main process
3299                          * can reply with signing
3300                          */
3301                         SIVAL(buf, smb_ss_field, seqnum);
3302                         SIVAL(buf, smb_ss_field+4, NT_STATUS_V(NT_STATUS_OK));
3303                 }
3304
3305                 iov = &state->pending[num_pending];
3306                 iov->iov_base = talloc_move(state->pending, &buf);
3307                 iov->iov_len = buflen;
3308
3309                 DEBUG(10,("echo_handler[%d]: forward to main\n",
3310                           (int)getpid()));
3311                 smbd_echo_activate_writer(state);
3312         }
3313
3314         req = smbd_echo_read_send(state, state->ev, state->xconn);
3315         if (req == NULL) {
3316                 DEBUG(1, ("smbd_echo_read_send failed\n"));
3317                 exit(1);
3318         }
3319         tevent_req_set_callback(req, smbd_echo_got_packet, state);
3320 }
3321
3322
3323 /*
3324  * Handle SMBecho requests in a forked child process
3325  */
3326 bool fork_echo_handler(struct smbXsrv_connection *xconn)
3327 {
3328         int listener_pipe[2];
3329         int res;
3330         pid_t child;
3331         bool use_mutex = false;
3332
3333         res = pipe(listener_pipe);
3334         if (res == -1) {
3335                 DEBUG(1, ("pipe() failed: %s\n", strerror(errno)));
3336                 return false;
3337         }
3338
3339 #ifdef HAVE_ROBUST_MUTEXES
3340         use_mutex = tdb_runtime_check_for_robust_mutexes();
3341
3342         if (use_mutex) {
3343                 pthread_mutexattr_t a;
3344
3345                 xconn->smb1.echo_handler.socket_mutex =
3346                         anonymous_shared_allocate(sizeof(pthread_mutex_t));
3347                 if (xconn->smb1.echo_handler.socket_mutex == NULL) {
3348                         DEBUG(1, ("Could not create mutex shared memory: %s\n",
3349                                   strerror(errno)));
3350                         goto fail;
3351                 }
3352
3353                 res = pthread_mutexattr_init(&a);
3354                 if (res != 0) {
3355                         DEBUG(1, ("pthread_mutexattr_init failed: %s\n",
3356                                   strerror(res)));
3357                         goto fail;
3358                 }
3359                 res = pthread_mutexattr_settype(&a, PTHREAD_MUTEX_ERRORCHECK);
3360                 if (res != 0) {
3361                         DEBUG(1, ("pthread_mutexattr_settype failed: %s\n",
3362                                   strerror(res)));
3363                         pthread_mutexattr_destroy(&a);
3364                         goto fail;
3365                 }
3366                 res = pthread_mutexattr_setpshared(&a, PTHREAD_PROCESS_SHARED);
3367                 if (res != 0) {
3368                         DEBUG(1, ("pthread_mutexattr_setpshared failed: %s\n",
3369                                   strerror(res)));
3370                         pthread_mutexattr_destroy(&a);
3371                         goto fail;
3372                 }
3373                 res = pthread_mutexattr_setrobust(&a, PTHREAD_MUTEX_ROBUST);
3374                 if (res != 0) {
3375                         DEBUG(1, ("pthread_mutexattr_setrobust failed: "
3376                                   "%s\n", strerror(res)));
3377                         pthread_mutexattr_destroy(&a);
3378                         goto fail;
3379                 }
3380                 res = pthread_mutex_init(xconn->smb1.echo_handler.socket_mutex,
3381                                          &a);
3382                 pthread_mutexattr_destroy(&a);
3383                 if (res != 0) {
3384                         DEBUG(1, ("pthread_mutex_init failed: %s\n",
3385                                   strerror(res)));
3386                         goto fail;
3387                 }
3388         }
3389 #endif
3390
3391         if (!use_mutex) {
3392                 xconn->smb1.echo_handler.socket_lock_fd =
3393                         create_unlink_tmp(lp_lock_directory());
3394                 if (xconn->smb1.echo_handler.socket_lock_fd == -1) {
3395                         DEBUG(1, ("Could not create lock fd: %s\n",
3396                                   strerror(errno)));
3397                         goto fail;
3398                 }
3399         }
3400
3401         child = fork();
3402         if (child == 0) {
3403                 NTSTATUS status;
3404
3405                 close(listener_pipe[0]);
3406                 set_blocking(listener_pipe[1], false);
3407
3408                 status = smbd_reinit_after_fork(xconn->msg_ctx, xconn->ev_ctx,
3409                                                 true, "smbd-echo");
3410                 if (!NT_STATUS_IS_OK(status)) {
3411                         DEBUG(1, ("reinit_after_fork failed: %s\n",
3412                                   nt_errstr(status)));
3413                         exit(1);
3414                 }
3415                 smbd_echo_loop(xconn, listener_pipe[1]);
3416                 exit(0);
3417         }
3418         close(listener_pipe[1]);
3419         listener_pipe[1] = -1;
3420         xconn->smb1.echo_handler.trusted_fd = listener_pipe[0];
3421
3422         DEBUG(10,("fork_echo_handler: main[%d] echo_child[%d]\n", (int)getpid(), (int)child));
3423
3424         /*
3425          * Without smb signing this is the same as the normal smbd
3426          * listener. This needs to change once signing comes in.
3427          */
3428         xconn->smb1.echo_handler.trusted_fde = tevent_add_fd(xconn->ev_ctx,
3429                                         xconn,
3430                                         xconn->smb1.echo_handler.trusted_fd,
3431                                         TEVENT_FD_READ,
3432                                         smbd_server_echo_handler,
3433                                         xconn);
3434         if (xconn->smb1.echo_handler.trusted_fde == NULL) {
3435                 DEBUG(1, ("event_add_fd failed\n"));
3436                 goto fail;
3437         }
3438
3439         return true;
3440
3441 fail:
3442         if (listener_pipe[0] != -1) {
3443                 close(listener_pipe[0]);
3444         }
3445         if (listener_pipe[1] != -1) {
3446                 close(listener_pipe[1]);
3447         }
3448         if (xconn->smb1.echo_handler.socket_lock_fd != -1) {
3449                 close(xconn->smb1.echo_handler.socket_lock_fd);
3450         }
3451 #ifdef HAVE_ROBUST_MUTEXES
3452         if (xconn->smb1.echo_handler.socket_mutex != NULL) {
3453                 pthread_mutex_destroy(xconn->smb1.echo_handler.socket_mutex);
3454                 anonymous_shared_free(xconn->smb1.echo_handler.socket_mutex);
3455         }
3456 #endif
3457         smbd_echo_init(xconn);
3458
3459         return false;
3460 }
3461
3462 static bool uid_in_use(const struct user_struct *user, uid_t uid)
3463 {
3464         while (user) {
3465                 if (user->session_info &&
3466                     (user->session_info->unix_token->uid == uid)) {
3467                         return true;
3468                 }
3469                 user = user->next;
3470         }
3471         return false;
3472 }
3473
3474 static bool gid_in_use(const struct user_struct *user, gid_t gid)
3475 {
3476         while (user) {
3477                 if (user->session_info != NULL) {
3478                         int i;
3479                         struct security_unix_token *utok;
3480
3481                         utok = user->session_info->unix_token;
3482                         if (utok->gid == gid) {
3483                                 return true;
3484                         }
3485                         for(i=0; i<utok->ngroups; i++) {
3486                                 if (utok->groups[i] == gid) {
3487                                         return true;
3488                                 }
3489                         }
3490                 }
3491                 user = user->next;
3492         }
3493         return false;
3494 }
3495
3496 static bool sid_in_use(const struct user_struct *user,
3497                        const struct dom_sid *psid)
3498 {
3499         while (user) {
3500                 struct security_token *tok;
3501
3502                 if (user->session_info == NULL) {
3503                         continue;
3504                 }
3505                 tok = user->session_info->security_token;
3506                 if (tok == NULL) {
3507                         /*
3508                          * Not sure session_info->security_token can
3509                          * ever be NULL. This check might be not
3510                          * necessary.
3511                          */
3512                         continue;
3513                 }
3514                 if (security_token_has_sid(tok, psid)) {
3515                         return true;
3516                 }
3517                 user = user->next;
3518         }
3519         return false;
3520 }
3521
3522 static bool id_in_use(const struct user_struct *user,
3523                       const struct id_cache_ref *id)
3524 {
3525         switch(id->type) {
3526         case UID:
3527                 return uid_in_use(user, id->id.uid);
3528         case GID:
3529                 return gid_in_use(user, id->id.gid);
3530         case SID:
3531                 return sid_in_use(user, &id->id.sid);
3532         default:
3533                 break;
3534         }
3535         return false;
3536 }
3537
3538 static void smbd_id_cache_kill(struct messaging_context *msg_ctx,
3539                                void *private_data,
3540                                uint32_t msg_type,
3541                                struct server_id server_id,
3542                                DATA_BLOB* data)
3543 {
3544         const char *msg = (data && data->data)
3545                 ? (const char *)data->data : "<NULL>";
3546         struct id_cache_ref id;
3547         struct smbd_server_connection *sconn =
3548                 talloc_get_type_abort(private_data,
3549                 struct smbd_server_connection);
3550
3551         if (!id_cache_ref_parse(msg, &id)) {
3552                 DEBUG(0, ("Invalid ?ID: %s\n", msg));
3553                 return;
3554         }
3555
3556         if (id_in_use(sconn->users, &id)) {
3557                 exit_server_cleanly(msg);
3558         }
3559         id_cache_delete_from_cache(&id);
3560 }
3561
3562 NTSTATUS smbXsrv_connection_init_tables(struct smbXsrv_connection *conn,
3563                                         enum protocol_types protocol)
3564 {
3565         NTSTATUS status;
3566
3567         conn->protocol = protocol;
3568
3569         if (conn->client->session_table != NULL) {
3570                 return NT_STATUS_OK;
3571         }
3572
3573         if (protocol >= PROTOCOL_SMB2_02) {
3574                 status = smb2srv_session_table_init(conn);
3575                 if (!NT_STATUS_IS_OK(status)) {
3576                         conn->protocol = PROTOCOL_NONE;
3577                         return status;
3578                 }
3579
3580                 status = smb2srv_open_table_init(conn);
3581                 if (!NT_STATUS_IS_OK(status)) {
3582                         conn->protocol = PROTOCOL_NONE;
3583                         return status;
3584                 }
3585         } else {
3586                 status = smb1srv_session_table_init(conn);
3587                 if (!NT_STATUS_IS_OK(status)) {
3588                         conn->protocol = PROTOCOL_NONE;
3589                         return status;
3590                 }
3591
3592                 status = smb1srv_tcon_table_init(conn);
3593                 if (!NT_STATUS_IS_OK(status)) {
3594                         conn->protocol = PROTOCOL_NONE;
3595                         return status;
3596                 }
3597
3598                 status = smb1srv_open_table_init(conn);
3599                 if (!NT_STATUS_IS_OK(status)) {
3600                         conn->protocol = PROTOCOL_NONE;
3601                         return status;
3602                 }
3603         }
3604
3605         set_Protocol(protocol);
3606         return NT_STATUS_OK;
3607 }
3608
3609 struct smbd_tevent_trace_state {
3610         struct tevent_context *ev;
3611         TALLOC_CTX *frame;
3612         SMBPROFILE_BASIC_ASYNC_STATE(profile_idle);
3613 };
3614
3615 static void smbd_tevent_trace_callback(enum tevent_trace_point point,
3616                                        void *private_data)
3617 {
3618         struct smbd_tevent_trace_state *state =
3619                 (struct smbd_tevent_trace_state *)private_data;
3620
3621         switch (point) {
3622         case TEVENT_TRACE_BEFORE_WAIT:
3623                 if (!smbprofile_dump_pending()) {
3624                         /*
3625                          * If there's no dump pending
3626                          * we don't want to schedule a new 1 sec timer.
3627                          *
3628                          * Instead we want to sleep as long as nothing happens.
3629                          */
3630                         smbprofile_dump_setup(NULL);
3631                 }
3632                 SMBPROFILE_BASIC_ASYNC_START(idle, profile_p, state->profile_idle);
3633                 break;
3634         case TEVENT_TRACE_AFTER_WAIT:
3635                 SMBPROFILE_BASIC_ASYNC_END(state->profile_idle);
3636                 if (!smbprofile_dump_pending()) {
3637                         /*
3638                          * We need to flush our state after sleeping
3639                          * (hopefully a long time).
3640                          */
3641                         smbprofile_dump();
3642                         /*
3643                          * future profiling events should trigger timers
3644                          * on our main event context.
3645                          */
3646                         smbprofile_dump_setup(state->ev);
3647                 }
3648                 break;
3649         case TEVENT_TRACE_BEFORE_LOOP_ONCE:
3650                 TALLOC_FREE(state->frame);
3651                 state->frame = talloc_stackframe_pool(8192);
3652                 break;
3653         case TEVENT_TRACE_AFTER_LOOP_ONCE:
3654                 TALLOC_FREE(state->frame);
3655                 break;
3656         }
3657
3658         errno = 0;
3659 }
3660
3661 /**
3662  * Create a debug string for the connection
3663  *
3664  * This is allocated to talloc_tos() or a string constant
3665  * in certain corner cases. The returned string should
3666  * hence not be free'd directly but only via the talloc stack.
3667  */
3668 const char *smbXsrv_connection_dbg(const struct smbXsrv_connection *xconn)
3669 {
3670         const char *ret;
3671
3672         /*
3673          * TODO: this can be improved later
3674          * maybe including the client guid or more
3675          */
3676         ret = tsocket_address_string(xconn->remote_address, talloc_tos());
3677         if (ret == NULL) {
3678                 return "<tsocket_address_string() failed>";
3679         }
3680
3681         return ret;
3682 }
3683
3684 NTSTATUS smbd_add_connection(struct smbXsrv_client *client, int sock_fd,
3685                              struct smbXsrv_connection **_xconn)
3686 {
3687         TALLOC_CTX *frame = talloc_stackframe();
3688         struct smbXsrv_connection *xconn;
3689         struct sockaddr_storage ss_srv;
3690         void *sp_srv = (void *)&ss_srv;
3691         struct sockaddr *sa_srv = (struct sockaddr *)sp_srv;
3692         struct sockaddr_storage ss_clnt;
3693         void *sp_clnt = (void *)&ss_clnt;
3694         struct sockaddr *sa_clnt = (struct sockaddr *)sp_clnt;
3695         socklen_t sa_socklen;
3696         struct tsocket_address *local_address = NULL;
3697         struct tsocket_address *remote_address = NULL;
3698         const char *remaddr = NULL;
3699         char *p;
3700         const char *rhost = NULL;
3701         int ret;
3702         int tmp;
3703
3704         *_xconn = NULL;
3705
3706         DO_PROFILE_INC(connect);
3707
3708         xconn = talloc_zero(client, struct smbXsrv_connection);
3709         if (xconn == NULL) {
3710                 DEBUG(0,("talloc_zero(struct smbXsrv_connection)\n"));
3711                 TALLOC_FREE(frame);
3712                 return NT_STATUS_NO_MEMORY;
3713         }
3714         talloc_steal(frame, xconn);
3715
3716         xconn->ev_ctx = client->ev_ctx;
3717         xconn->msg_ctx = client->msg_ctx;
3718         xconn->transport.sock = sock_fd;
3719         smbd_echo_init(xconn);
3720         xconn->protocol = PROTOCOL_NONE;
3721
3722         /* Ensure child is set to blocking mode */
3723         set_blocking(sock_fd,True);
3724
3725         set_socket_options(sock_fd, "SO_KEEPALIVE");
3726         set_socket_options(sock_fd, lp_socket_options());
3727
3728         sa_socklen = sizeof(ss_clnt);
3729         ret = getpeername(sock_fd, sa_clnt, &sa_socklen);
3730         if (ret != 0) {
3731                 int saved_errno = errno;
3732                 int level = (errno == ENOTCONN)?2:0;
3733                 DEBUG(level,("getpeername() failed - %s\n",
3734                       strerror(saved_errno)));
3735                 TALLOC_FREE(frame);
3736                 return map_nt_error_from_unix_common(saved_errno);
3737         }
3738         ret = tsocket_address_bsd_from_sockaddr(xconn,
3739                                                 sa_clnt, sa_socklen,
3740                                                 &remote_address);
3741         if (ret != 0) {
3742                 int saved_errno = errno;
3743                 DEBUG(0,("%s: tsocket_address_bsd_from_sockaddr remote failed - %s\n",
3744                         __location__, strerror(saved_errno)));
3745                 TALLOC_FREE(frame);
3746                 return map_nt_error_from_unix_common(saved_errno);
3747         }
3748
3749         sa_socklen = sizeof(ss_srv);
3750         ret = getsockname(sock_fd, sa_srv, &sa_socklen);
3751         if (ret != 0) {
3752                 int saved_errno = errno;
3753                 int level = (errno == ENOTCONN)?2:0;
3754                 DEBUG(level,("getsockname() failed - %s\n",
3755                       strerror(saved_errno)));
3756                 TALLOC_FREE(frame);
3757                 return map_nt_error_from_unix_common(saved_errno);
3758         }
3759         ret = tsocket_address_bsd_from_sockaddr(xconn,
3760                                                 sa_srv, sa_socklen,
3761                                                 &local_address);
3762         if (ret != 0) {
3763                 int saved_errno = errno;
3764                 DEBUG(0,("%s: tsocket_address_bsd_from_sockaddr remote failed - %s\n",
3765                         __location__, strerror(saved_errno)));
3766                 TALLOC_FREE(frame);
3767                 return map_nt_error_from_unix_common(saved_errno);
3768         }
3769
3770         if (tsocket_address_is_inet(remote_address, "ip")) {
3771                 remaddr = tsocket_address_inet_addr_string(remote_address,
3772                                                            talloc_tos());
3773                 if (remaddr == NULL) {
3774                         DEBUG(0,("%s: tsocket_address_inet_addr_string remote failed - %s\n",
3775                                  __location__, strerror(errno)));
3776                         TALLOC_FREE(frame);
3777                         return NT_STATUS_NO_MEMORY;
3778                 }
3779         } else {
3780                 remaddr = "0.0.0.0";
3781         }
3782
3783         /*
3784          * Before the first packet, check the global hosts allow/ hosts deny
3785          * parameters before doing any parsing of packets passed to us by the
3786          * client. This prevents attacks on our parsing code from hosts not in
3787          * the hosts allow list.
3788          */
3789
3790         ret = get_remote_hostname(remote_address,
3791                                   &p, talloc_tos());
3792         if (ret < 0) {
3793                 int saved_errno = errno;
3794                 DEBUG(0,("%s: get_remote_hostname failed - %s\n",
3795                         __location__, strerror(saved_errno)));
3796                 TALLOC_FREE(frame);
3797                 return map_nt_error_from_unix_common(saved_errno);
3798         }
3799         rhost = p;
3800         if (strequal(rhost, "UNKNOWN")) {
3801                 rhost = remaddr;
3802         }
3803
3804         xconn->local_address = local_address;
3805         xconn->remote_address = remote_address;
3806         xconn->remote_hostname = talloc_strdup(xconn, rhost);
3807         if (xconn->remote_hostname == NULL) {
3808                 return NT_STATUS_NO_MEMORY;
3809         }
3810
3811         if (!srv_init_signing(xconn)) {
3812                 DEBUG(0, ("Failed to init smb_signing\n"));
3813                 TALLOC_FREE(frame);
3814                 return NT_STATUS_INTERNAL_ERROR;
3815         }
3816
3817         if (!allow_access(lp_hosts_deny(-1), lp_hosts_allow(-1),
3818                           xconn->remote_hostname,
3819                           remaddr)) {
3820                 DEBUG( 1, ("Connection denied from %s to %s\n",
3821                            tsocket_address_string(remote_address, talloc_tos()),
3822                            tsocket_address_string(local_address, talloc_tos())));
3823
3824                 /*
3825                  * We return a valid xconn
3826                  * so that the caller can return an error message
3827                  * to the client
3828                  */
3829                 client->connections = xconn;
3830                 xconn->client = client;
3831                 talloc_steal(client, xconn);
3832
3833                 *_xconn = xconn;
3834                 TALLOC_FREE(frame);
3835                 return NT_STATUS_NETWORK_ACCESS_DENIED;
3836         }
3837
3838         DEBUG(10, ("Connection allowed from %s to %s\n",
3839                    tsocket_address_string(remote_address, talloc_tos()),
3840                    tsocket_address_string(local_address, talloc_tos())));
3841
3842         if (lp_clustering()) {
3843                 /*
3844                  * We need to tell ctdb about our client's TCP
3845                  * connection, so that for failover ctdbd can send
3846                  * tickle acks, triggering a reconnection by the
3847                  * client.
3848                  */
3849                 NTSTATUS status;
3850
3851                 status = smbd_register_ips(xconn, &ss_srv, &ss_clnt);
3852                 if (!NT_STATUS_IS_OK(status)) {
3853                         DEBUG(0, ("ctdbd_register_ips failed: %s\n",
3854                                   nt_errstr(status)));
3855                 }
3856         }
3857
3858         tmp = lp_max_xmit();
3859         tmp = MAX(tmp, SMB_BUFFER_SIZE_MIN);
3860         tmp = MIN(tmp, SMB_BUFFER_SIZE_MAX);
3861
3862         xconn->smb1.negprot.max_recv = tmp;
3863
3864         xconn->smb1.sessions.done_sesssetup = false;
3865         xconn->smb1.sessions.max_send = SMB_BUFFER_SIZE_MAX;
3866
3867         xconn->transport.fde = tevent_add_fd(client->ev_ctx,
3868                                              xconn,
3869                                              sock_fd,
3870                                              TEVENT_FD_READ,
3871                                              smbd_server_connection_handler,
3872                                              xconn);
3873         if (!xconn->transport.fde) {
3874                 TALLOC_FREE(frame);
3875                 return NT_STATUS_NO_MEMORY;
3876         }
3877
3878         /* for now we only have one connection */
3879         DLIST_ADD_END(client->connections, xconn);
3880         xconn->client = client;
3881         talloc_steal(client, xconn);
3882
3883         *_xconn = xconn;
3884         TALLOC_FREE(frame);
3885         return NT_STATUS_OK;
3886 }
3887
3888 /****************************************************************************
3889  Process commands from the client
3890 ****************************************************************************/
3891
3892 void smbd_process(struct tevent_context *ev_ctx,
3893                   struct messaging_context *msg_ctx,
3894                   int sock_fd,
3895                   bool interactive)
3896 {
3897         struct smbd_tevent_trace_state trace_state = {
3898                 .ev = ev_ctx,
3899                 .frame = talloc_stackframe(),
3900         };
3901         struct smbXsrv_client *client = NULL;
3902         struct smbd_server_connection *sconn = NULL;
3903         struct smbXsrv_connection *xconn = NULL;
3904         const char *locaddr = NULL;
3905         const char *remaddr = NULL;
3906         int ret;
3907         NTSTATUS status;
3908         struct timeval tv = timeval_current();
3909         NTTIME now = timeval_to_nttime(&tv);
3910         char *chroot_dir = NULL;
3911         int rc;
3912
3913         status = smbXsrv_client_create(ev_ctx, ev_ctx, msg_ctx, now, &client);
3914         if (!NT_STATUS_IS_OK(status)) {
3915                 DBG_ERR("smbXsrv_client_create(): %s\n", nt_errstr(status));
3916                 exit_server_cleanly("talloc_zero(struct smbXsrv_client).\n");
3917         }
3918
3919         /*
3920          * TODO: remove this...:-)
3921          */
3922         global_smbXsrv_client = client;
3923
3924         sconn = talloc_zero(client, struct smbd_server_connection);
3925         if (sconn == NULL) {
3926                 exit_server("failed to create smbd_server_connection");
3927         }
3928
3929         client->sconn = sconn;
3930         sconn->client = client;
3931
3932         sconn->ev_ctx = ev_ctx;
3933         sconn->msg_ctx = msg_ctx;
3934
3935         if (lp_server_max_protocol() >= PROTOCOL_SMB2_02) {
3936                 /*
3937                  * We're not making the decision here,
3938                  * we're just allowing the client
3939                  * to decide between SMB1 and SMB2
3940                  * with the first negprot
3941                  * packet.
3942                  */
3943                 sconn->using_smb2 = true;
3944         }
3945
3946         if (!interactive) {
3947                 smbd_setup_sig_term_handler(sconn);
3948                 smbd_setup_sig_hup_handler(sconn);
3949
3950                 if (!serverid_register(messaging_server_id(msg_ctx),
3951                                        FLAG_MSG_GENERAL|FLAG_MSG_SMBD
3952                                        |FLAG_MSG_DBWRAP
3953                                        |FLAG_MSG_PRINT_GENERAL)) {
3954                         exit_server_cleanly("Could not register myself in "
3955                                             "serverid.tdb");
3956                 }
3957         }
3958
3959         status = smbd_add_connection(client, sock_fd, &xconn);
3960         if (NT_STATUS_EQUAL(status, NT_STATUS_NETWORK_ACCESS_DENIED)) {
3961                 /*
3962                  * send a negative session response "not listening on calling
3963                  * name"
3964                  */
3965                 unsigned char buf[5] = {0x83, 0, 0, 1, 0x81};
3966                 (void)srv_send_smb(xconn,(char *)buf, false,
3967                                    0, false, NULL);
3968                 exit_server_cleanly("connection denied");
3969         } else if (!NT_STATUS_IS_OK(status)) {
3970                 exit_server_cleanly(nt_errstr(status));
3971         }
3972
3973         sconn->local_address =
3974                 tsocket_address_copy(xconn->local_address, sconn);
3975         if (sconn->local_address == NULL) {
3976                 exit_server_cleanly("tsocket_address_copy() failed");
3977         }
3978         sconn->remote_address =
3979                 tsocket_address_copy(xconn->remote_address, sconn);
3980         if (sconn->remote_address == NULL) {
3981                 exit_server_cleanly("tsocket_address_copy() failed");
3982         }
3983         sconn->remote_hostname =
3984                 talloc_strdup(sconn, xconn->remote_hostname);
3985         if (sconn->remote_hostname == NULL) {
3986                 exit_server_cleanly("tsocket_strdup() failed");
3987         }
3988
3989         if (tsocket_address_is_inet(sconn->local_address, "ip")) {
3990                 locaddr = tsocket_address_inet_addr_string(
3991                                 sconn->local_address,
3992                                 talloc_tos());
3993                 if (locaddr == NULL) {
3994                         DEBUG(0,("%s: tsocket_address_inet_addr_string remote failed - %s\n",
3995                                  __location__, strerror(errno)));
3996                         exit_server_cleanly("tsocket_address_inet_addr_string remote failed.\n");
3997                 }
3998         } else {
3999                 locaddr = "0.0.0.0";
4000         }
4001
4002         if (tsocket_address_is_inet(sconn->remote_address, "ip")) {
4003                 remaddr = tsocket_address_inet_addr_string(
4004                                 sconn->remote_address,
4005                                 talloc_tos());
4006                 if (remaddr == NULL) {
4007                         DEBUG(0,("%s: tsocket_address_inet_addr_string remote failed - %s\n",
4008                                  __location__, strerror(errno)));
4009                         exit_server_cleanly("tsocket_address_inet_addr_string remote failed.\n");
4010                 }
4011         } else {
4012                 remaddr = "0.0.0.0";
4013         }
4014
4015         /* this is needed so that we get decent entries
4016            in smbstatus for port 445 connects */
4017         set_remote_machine_name(remaddr, false);
4018         reload_services(sconn, conn_snum_used, true);
4019         sub_set_socket_ids(remaddr,
4020                            sconn->remote_hostname,
4021                            locaddr);
4022
4023         if (lp_preload_modules()) {
4024                 smb_load_all_modules_absoute_path(lp_preload_modules());
4025         }
4026
4027         smb_perfcount_init();
4028
4029         if (!init_account_policy()) {
4030                 exit_server("Could not open account policy tdb.\n");
4031         }
4032
4033         chroot_dir = lp_root_directory(talloc_tos());
4034         if (chroot_dir[0] != '\0') {
4035                 rc = chdir(chroot_dir);
4036                 if (rc != 0) {
4037                         DBG_ERR("Failed to chdir to %s\n", chroot_dir);
4038                         exit_server("Failed to chdir()");
4039                 }
4040
4041                 rc = chroot(chroot_dir);
4042                 if (rc != 0) {
4043                         DBG_ERR("Failed to change root to %s\n", chroot_dir);
4044                         exit_server("Failed to chroot()");
4045                 }
4046                 DBG_WARNING("Changed root to %s\n", chroot_dir);
4047
4048                 TALLOC_FREE(chroot_dir);
4049         }
4050
4051         if (!file_init(sconn)) {
4052                 exit_server("file_init() failed");
4053         }
4054
4055         /* Setup oplocks */
4056         if (!init_oplocks(sconn))
4057                 exit_server("Failed to init oplocks");
4058
4059         /* register our message handlers */
4060         messaging_register(sconn->msg_ctx, sconn,
4061                            MSG_SMB_FORCE_TDIS, msg_force_tdis);
4062         messaging_register(sconn->msg_ctx, sconn,
4063                            MSG_SMB_CLOSE_FILE, msg_close_file);
4064         messaging_register(sconn->msg_ctx, sconn,
4065                            MSG_SMB_FILE_RENAME, msg_file_was_renamed);
4066
4067         id_cache_register_msgs(sconn->msg_ctx);
4068         messaging_deregister(sconn->msg_ctx, ID_CACHE_KILL, NULL);
4069         messaging_register(sconn->msg_ctx, sconn,
4070                            ID_CACHE_KILL, smbd_id_cache_kill);
4071
4072         messaging_deregister(sconn->msg_ctx,
4073                              MSG_SMB_CONF_UPDATED, sconn->ev_ctx);
4074         messaging_register(sconn->msg_ctx, sconn,
4075                            MSG_SMB_CONF_UPDATED, smbd_conf_updated);
4076
4077         messaging_deregister(sconn->msg_ctx, MSG_SMB_KILL_CLIENT_IP,
4078                              NULL);
4079         messaging_register(sconn->msg_ctx, sconn,
4080                            MSG_SMB_KILL_CLIENT_IP,
4081                            msg_kill_client_ip);
4082
4083         messaging_deregister(sconn->msg_ctx, MSG_SMB_TELL_NUM_CHILDREN, NULL);
4084
4085         /*
4086          * Use the default MSG_DEBUG handler to avoid rebroadcasting
4087          * MSGs to all child processes
4088          */
4089         messaging_deregister(sconn->msg_ctx,
4090                              MSG_DEBUG, NULL);
4091         messaging_register(sconn->msg_ctx, NULL,
4092                            MSG_DEBUG, debug_message);
4093
4094         if ((lp_keepalive() != 0)
4095             && !(event_add_idle(ev_ctx, NULL,
4096                                 timeval_set(lp_keepalive(), 0),
4097                                 "keepalive", keepalive_fn,
4098                                 sconn))) {
4099                 DEBUG(0, ("Could not add keepalive event\n"));
4100                 exit(1);
4101         }
4102
4103         if (!(event_add_idle(ev_ctx, NULL,
4104                              timeval_set(IDLE_CLOSED_TIMEOUT, 0),
4105                              "deadtime", deadtime_fn, sconn))) {
4106                 DEBUG(0, ("Could not add deadtime event\n"));
4107                 exit(1);
4108         }
4109
4110         if (!(event_add_idle(ev_ctx, NULL,
4111                              timeval_set(SMBD_HOUSEKEEPING_INTERVAL, 0),
4112                              "housekeeping", housekeeping_fn, sconn))) {
4113                 DEBUG(0, ("Could not add housekeeping event\n"));
4114                 exit(1);
4115         }
4116
4117         smbprofile_dump_setup(ev_ctx);
4118
4119         if (!init_dptrs(sconn)) {
4120                 exit_server("init_dptrs() failed");
4121         }
4122
4123         TALLOC_FREE(trace_state.frame);
4124
4125         tevent_set_trace_callback(ev_ctx, smbd_tevent_trace_callback,
4126                                   &trace_state);
4127
4128         ret = tevent_loop_wait(ev_ctx);
4129         if (ret != 0) {
4130                 DEBUG(1, ("tevent_loop_wait failed: %d, %s,"
4131                           " exiting\n", ret, strerror(errno)));
4132         }
4133
4134         TALLOC_FREE(trace_state.frame);
4135
4136         exit_server_cleanly(NULL);
4137 }
4138
4139 bool req_is_in_chain(const struct smb_request *req)
4140 {
4141         if (req->vwv != (const uint16_t *)(req->inbuf+smb_vwv)) {
4142                 /*
4143                  * We're right now handling a subsequent request, so we must
4144                  * be in a chain
4145                  */
4146                 return true;
4147         }
4148
4149         if (!is_andx_req(req->cmd)) {
4150                 return false;
4151         }
4152
4153         if (req->wct < 2) {
4154                 /*
4155                  * Okay, an illegal request, but definitely not chained :-)
4156                  */
4157                 return false;
4158         }
4159
4160         return (CVAL(req->vwv+0, 0) != 0xFF);
4161 }