libcli/smb/smbXcli_base.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Infrastructure for async SMB client requests
   4    Copyright (C) Volker Lendecke 2008
   5    Copyright (C) Stefan Metzmacher 2011
   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 "system/network.h"
  23 #include "../lib/async_req/async_sock.h"
  24 #include "../lib/util/tevent_ntstatus.h"
  25 #include "../lib/util/tevent_unix.h"
  26 #include "lib/util/util_net.h"
  27 #include "lib/util/dlinklist.h"
  28 #include "../libcli/smb/smb_common.h"
  29 #include "../libcli/smb/smb_seal.h"
  30 #include "../libcli/smb/smb_signing.h"
  31 #include "../libcli/smb/read_smb.h"
  32 #include "smbXcli_base.h"
  33 #include "librpc/ndr/libndr.h"
  34
  35 struct smbXcli_conn;
  36 struct smbXcli_req;
  37 struct smbXcli_session;
  38 struct smbXcli_tcon;
  39
  40 struct smbXcli_conn {
  41         int read_fd;
  42         int write_fd;
  43         struct sockaddr_storage local_ss;
  44         struct sockaddr_storage remote_ss;
  45         const char *remote_name;
  46
  47         struct tevent_queue *outgoing;
  48         struct tevent_req **pending;
  49         struct tevent_req *read_smb_req;
  50
  51         enum protocol_types protocol;
  52         bool allow_signing;
  53         bool desire_signing;
  54         bool mandatory_signing;
  55
  56         /*
  57          * The incoming dispatch function should return:
  58          * - NT_STATUS_RETRY, if more incoming PDUs are expected.
  59          * - NT_STATUS_OK, if no more processing is desired, e.g.
  60          *                 the dispatch function called
  61          *                 tevent_req_done().
  62          * - All other return values disconnect the connection.
  63          */
  64         NTSTATUS (*dispatch_incoming)(struct smbXcli_conn *conn,
  65                                       TALLOC_CTX *tmp_mem,
  66                                       uint8_t *inbuf);
  67
  68         struct {
  69                 struct {
  70                         uint32_t capabilities;
  71                         uint32_t max_xmit;
  72                 } client;
  73
  74                 struct {
  75                         uint32_t capabilities;
  76                         uint32_t max_xmit;
  77                         uint16_t max_mux;
  78                         uint16_t security_mode;
  79                         bool readbraw;
  80                         bool writebraw;
  81                         bool lockread;
  82                         bool writeunlock;
  83                         uint32_t session_key;
  84                         struct GUID guid;
  85                         DATA_BLOB gss_blob;
  86                         uint8_t challenge[8];
  87                         const char *workgroup;
  88                         const char *name;
  89                         int time_zone;
  90                         NTTIME system_time;
  91                 } server;
  92
  93                 uint32_t capabilities;
  94                 uint32_t max_xmit;
  95
  96                 uint16_t mid;
  97
  98                 struct smb_signing_state *signing;
  99                 struct smb_trans_enc_state *trans_enc;
 100
 101                 struct tevent_req *read_braw_req;
 102         } smb1;
 103
 104         struct {
 105                 struct {
 106                         uint32_t capabilities;
 107                         uint16_t security_mode;
 108                         struct GUID guid;
 109                 } client;
 110
 111                 struct {
 112                         uint32_t capabilities;
 113                         uint16_t security_mode;
 114                         struct GUID guid;
 115                         uint32_t max_trans_size;
 116                         uint32_t max_read_size;
 117                         uint32_t max_write_size;
 118                         NTTIME system_time;
 119                         NTTIME start_time;
 120                         DATA_BLOB gss_blob;
 121                 } server;
 122
 123                 uint64_t mid;
 124                 uint16_t cur_credits;
 125                 uint16_t max_credits;
 126         } smb2;
 127
 128         struct smbXcli_session *sessions;
 129 };
 130
 131 struct smb2cli_session {
 132         uint64_t session_id;
 133         uint16_t session_flags;
 134         DATA_BLOB application_key;
 135         DATA_BLOB signing_key;
 136         bool should_sign;
 137         bool should_encrypt;
 138         DATA_BLOB encryption_key;
 139         DATA_BLOB decryption_key;
 140         uint64_t nonce_high;
 141         uint64_t nonce_low;
 142         uint16_t channel_sequence;
 143 };
 144
 145 struct smbXcli_session {
 146         struct smbXcli_session *prev, *next;
 147         struct smbXcli_conn *conn;
 148
 149         struct {
 150                 uint16_t session_id;
 151                 DATA_BLOB application_key;
 152                 bool protected_key;
 153         } smb1;
 154
 155         struct smb2cli_session *smb2;
 156
 157         struct {
 158                 DATA_BLOB signing_key;
 159         } smb2_channel;
 160
 161         /*
 162          * this should be a short term hack
 163          * until the upper layers have implemented
 164          * re-authentication.
 165          */
 166         bool disconnect_expired;
 167 };
 168
 169 struct smbXcli_tcon {
 170         struct {
 171                 uint16_t tcon_id;
 172                 uint16_t optional_support;
 173                 uint32_t maximal_access;
 174                 uint32_t guest_maximal_access;
 175                 char *service;
 176                 char *fs_type;
 177         } smb1;
 178
 179         struct {
 180                 uint32_t tcon_id;
 181                 uint8_t type;
 182                 uint32_t flags;
 183                 uint32_t capabilities;
 184                 uint32_t maximal_access;
 185                 bool should_encrypt;
 186         } smb2;
 187 };
 188
 189 struct smbXcli_req_state {
 190         struct tevent_context *ev;
 191         struct smbXcli_conn *conn;
 192         struct smbXcli_session *session; /* maybe NULL */
 193         struct smbXcli_tcon *tcon; /* maybe NULL */
 194
 195         uint8_t length_hdr[4];
 196
 197         bool one_way;
 198
 199         uint8_t *inbuf;
 200
 201         struct {
 202                 /* Space for the header including the wct */
 203                 uint8_t hdr[HDR_VWV];
 204
 205                 /*
 206                  * For normal requests, smb1cli_req_send chooses a mid.
 207                  * SecondaryV trans requests need to use the mid of the primary
 208                  * request, so we need a place to store it.
 209                  * Assume it is set if != 0.
 210                  */
 211                 uint16_t mid;
 212
 213                 uint16_t *vwv;
 214                 uint8_t bytecount_buf[2];
 215
 216 #define MAX_SMB_IOV 10
 217                 /* length_hdr, hdr, words, byte_count, buffers */
 218                 struct iovec iov[1 + 3 + MAX_SMB_IOV];
 219                 int iov_count;
 220
 221                 bool one_way_seqnum;
 222                 uint32_t seqnum;
 223                 struct tevent_req **chained_requests;
 224
 225                 uint8_t recv_cmd;
 226                 NTSTATUS recv_status;
 227                 /* always an array of 3 talloc elements */
 228                 struct iovec *recv_iov;
 229         } smb1;
 230
 231         struct {
 232                 const uint8_t *fixed;
 233                 uint16_t fixed_len;
 234                 const uint8_t *dyn;
 235                 uint32_t dyn_len;
 236
 237                 uint8_t transform[SMB2_TF_HDR_SIZE];
 238                 uint8_t hdr[SMB2_HDR_BODY];
 239                 uint8_t pad[7]; /* padding space for compounding */
 240
 241                 /*
 242                  * always an array of 3 talloc elements
 243                  * (without a SMB2_TRANSFORM header!)
 244                  *
 245                  * HDR, BODY, DYN
 246                  */
 247                 struct iovec *recv_iov;
 248
 249                 /*
 250                  * the expected max for the response dyn_len
 251                  */
 252                 uint32_t max_dyn_len;
 253
 254                 uint16_t credit_charge;
 255
 256                 bool should_sign;
 257                 bool should_encrypt;
 258                 uint64_t encryption_session_id;
 259
 260                 bool signing_skipped;
 261                 bool notify_async;
 262                 bool got_async;
 263         } smb2;
 264 };
 265
 266 static int smbXcli_conn_destructor(struct smbXcli_conn *conn)
 267 {
 268         /*
 269          * NT_STATUS_OK, means we do not notify the callers
 270          */
 271         smbXcli_conn_disconnect(conn, NT_STATUS_OK);
 272
 273         while (conn->sessions) {
 274                 conn->sessions->conn = NULL;
 275                 DLIST_REMOVE(conn->sessions, conn->sessions);
 276         }
 277
 278         if (conn->smb1.trans_enc) {
 279                 TALLOC_FREE(conn->smb1.trans_enc);
 280         }
 281
 282         return 0;
 283 }
 284
 285 struct smbXcli_conn *smbXcli_conn_create(TALLOC_CTX *mem_ctx,
 286                                          int fd,
 287                                          const char *remote_name,
 288                                          enum smb_signing_setting signing_state,
 289                                          uint32_t smb1_capabilities,
 290                                          struct GUID *client_guid,
 291                                          uint32_t smb2_capabilities)
 292 {
 293         struct smbXcli_conn *conn = NULL;
 294         void *ss = NULL;
 295         struct sockaddr *sa = NULL;
 296         socklen_t sa_length;
 297         int ret;
 298
 299         conn = talloc_zero(mem_ctx, struct smbXcli_conn);
 300         if (!conn) {
 301                 return NULL;
 302         }
 303
 304         conn->read_fd = fd;
 305         conn->write_fd = dup(fd);
 306         if (conn->write_fd == -1) {
 307                 goto error;
 308         }
 309
 310         conn->remote_name = talloc_strdup(conn, remote_name);
 311         if (conn->remote_name == NULL) {
 312                 goto error;
 313         }
 314
 315
 316         ss = (void *)&conn->local_ss;
 317         sa = (struct sockaddr *)ss;
 318         sa_length = sizeof(conn->local_ss);
 319         ret = getsockname(fd, sa, &sa_length);
 320         if (ret == -1) {
 321                 goto error;
 322         }
 323         ss = (void *)&conn->remote_ss;
 324         sa = (struct sockaddr *)ss;
 325         sa_length = sizeof(conn->remote_ss);
 326         ret = getpeername(fd, sa, &sa_length);
 327         if (ret == -1) {
 328                 goto error;
 329         }
 330
 331         conn->outgoing = tevent_queue_create(conn, "smbXcli_outgoing");
 332         if (conn->outgoing == NULL) {
 333                 goto error;
 334         }
 335         conn->pending = NULL;
 336
 337         conn->protocol = PROTOCOL_NONE;
 338
 339         switch (signing_state) {
 340         case SMB_SIGNING_OFF:
 341                 /* never */
 342                 conn->allow_signing = false;
 343                 conn->desire_signing = false;
 344                 conn->mandatory_signing = false;
 345                 break;
 346         case SMB_SIGNING_DEFAULT:
 347         case SMB_SIGNING_IF_REQUIRED:
 348                 /* if the server requires it */
 349                 conn->allow_signing = true;
 350                 conn->desire_signing = false;
 351                 conn->mandatory_signing = false;
 352                 break;
 353         case SMB_SIGNING_REQUIRED:
 354                 /* always */
 355                 conn->allow_signing = true;
 356                 conn->desire_signing = true;
 357                 conn->mandatory_signing = true;
 358                 break;
 359         }
 360
 361         conn->smb1.client.capabilities = smb1_capabilities;
 362         conn->smb1.client.max_xmit = UINT16_MAX;
 363
 364         conn->smb1.capabilities = conn->smb1.client.capabilities;
 365         conn->smb1.max_xmit = 1024;
 366
 367         conn->smb1.mid = 1;
 368
 369         /* initialise signing */
 370         conn->smb1.signing = smb_signing_init(conn,
 371                                               conn->allow_signing,
 372                                               conn->desire_signing,
 373                                               conn->mandatory_signing);
 374         if (!conn->smb1.signing) {
 375                 goto error;
 376         }
 377
 378         conn->smb2.client.security_mode = SMB2_NEGOTIATE_SIGNING_ENABLED;
 379         if (conn->mandatory_signing) {
 380                 conn->smb2.client.security_mode |= SMB2_NEGOTIATE_SIGNING_REQUIRED;
 381         }
 382         if (client_guid) {
 383                 conn->smb2.client.guid = *client_guid;
 384         }
 385         conn->smb2.client.capabilities = smb2_capabilities;
 386
 387         conn->smb2.cur_credits = 1;
 388         conn->smb2.max_credits = 0;
 389
 390         talloc_set_destructor(conn, smbXcli_conn_destructor);
 391         return conn;
 392
 393  error:
 394         if (conn->write_fd != -1) {
 395                 close(conn->write_fd);
 396         }
 397         TALLOC_FREE(conn);
 398         return NULL;
 399 }
 400
 401 bool smbXcli_conn_is_connected(struct smbXcli_conn *conn)
 402 {
 403         if (conn == NULL) {
 404                 return false;
 405         }
 406
 407         if (conn->read_fd == -1) {
 408                 return false;
 409         }
 410
 411         return true;
 412 }
 413
 414 enum protocol_types smbXcli_conn_protocol(struct smbXcli_conn *conn)
 415 {
 416         return conn->protocol;
 417 }
 418
 419 bool smbXcli_conn_use_unicode(struct smbXcli_conn *conn)
 420 {
 421         if (conn->protocol >= PROTOCOL_SMB2_02) {
 422                 return true;
 423         }
 424
 425         if (conn->smb1.capabilities & CAP_UNICODE) {
 426                 return true;
 427         }
 428
 429         return false;
 430 }
 431
 432 void smbXcli_conn_set_sockopt(struct smbXcli_conn *conn, const char *options)
 433 {
 434         set_socket_options(conn->read_fd, options);
 435 }
 436
 437 const struct sockaddr_storage *smbXcli_conn_local_sockaddr(struct smbXcli_conn *conn)
 438 {
 439         return &conn->local_ss;
 440 }
 441
 442 const struct sockaddr_storage *smbXcli_conn_remote_sockaddr(struct smbXcli_conn *conn)
 443 {
 444         return &conn->remote_ss;
 445 }
 446
 447 const char *smbXcli_conn_remote_name(struct smbXcli_conn *conn)
 448 {
 449         return conn->remote_name;
 450 }
 451
 452 uint16_t smbXcli_conn_max_requests(struct smbXcli_conn *conn)
 453 {
 454         if (conn->protocol >= PROTOCOL_SMB2_02) {
 455                 /*
 456                  * TODO...
 457                  */
 458                 return 1;
 459         }
 460
 461         return conn->smb1.server.max_mux;
 462 }
 463
 464 NTTIME smbXcli_conn_server_system_time(struct smbXcli_conn *conn)
 465 {
 466         if (conn->protocol >= PROTOCOL_SMB2_02) {
 467                 return conn->smb2.server.system_time;
 468         }
 469
 470         return conn->smb1.server.system_time;
 471 }
 472
 473 const DATA_BLOB *smbXcli_conn_server_gss_blob(struct smbXcli_conn *conn)
 474 {
 475         if (conn->protocol >= PROTOCOL_SMB2_02) {
 476                 return &conn->smb2.server.gss_blob;
 477         }
 478
 479         return &conn->smb1.server.gss_blob;
 480 }
 481
 482 const struct GUID *smbXcli_conn_server_guid(struct smbXcli_conn *conn)
 483 {
 484         if (conn->protocol >= PROTOCOL_SMB2_02) {
 485                 return &conn->smb2.server.guid;
 486         }
 487
 488         return &conn->smb1.server.guid;
 489 }
 490
 491 struct smbXcli_conn_samba_suicide_state {
 492         struct smbXcli_conn *conn;
 493         struct iovec iov;
 494         uint8_t buf[9];
 495 };
 496
 497 static void smbXcli_conn_samba_suicide_done(struct tevent_req *subreq);
 498
 499 struct tevent_req *smbXcli_conn_samba_suicide_send(TALLOC_CTX *mem_ctx,
 500                                                    struct tevent_context *ev,
 501                                                    struct smbXcli_conn *conn,
 502                                                    uint8_t exitcode)
 503 {
 504         struct tevent_req *req, *subreq;
 505         struct smbXcli_conn_samba_suicide_state *state;
 506
 507         req = tevent_req_create(mem_ctx, &state,
 508                                 struct smbXcli_conn_samba_suicide_state);
 509         if (req == NULL) {
 510                 return NULL;
 511         }
 512         state->conn = conn;
 513         SIVAL(state->buf, 4, 0x74697865);
 514         SCVAL(state->buf, 8, exitcode);
 515         _smb_setlen_nbt(state->buf, sizeof(state->buf)-4);
 516
 517         state->iov.iov_base = state->buf;
 518         state->iov.iov_len = sizeof(state->buf);
 519
 520         subreq = writev_send(state, ev, conn->outgoing, conn->write_fd,
 521                              false, &state->iov, 1);
 522         if (tevent_req_nomem(subreq, req)) {
 523                 return tevent_req_post(req, ev);
 524         }
 525         tevent_req_set_callback(subreq, smbXcli_conn_samba_suicide_done, req);
 526         return req;
 527 }
 528
 529 static void smbXcli_conn_samba_suicide_done(struct tevent_req *subreq)
 530 {
 531         struct tevent_req *req = tevent_req_callback_data(
 532                 subreq, struct tevent_req);
 533         struct smbXcli_conn_samba_suicide_state *state = tevent_req_data(
 534                 req, struct smbXcli_conn_samba_suicide_state);
 535         ssize_t nwritten;
 536         int err;
 537
 538         nwritten = writev_recv(subreq, &err);
 539         TALLOC_FREE(subreq);
 540         if (nwritten == -1) {
 541                 NTSTATUS status = map_nt_error_from_unix_common(err);
 542                 smbXcli_conn_disconnect(state->conn, status);
 543                 return;
 544         }
 545         tevent_req_done(req);
 546 }
 547
 548 NTSTATUS smbXcli_conn_samba_suicide_recv(struct tevent_req *req)
 549 {
 550         return tevent_req_simple_recv_ntstatus(req);
 551 }
 552
 553 NTSTATUS smbXcli_conn_samba_suicide(struct smbXcli_conn *conn,
 554                                     uint8_t exitcode)
 555 {
 556         TALLOC_CTX *frame = talloc_stackframe();
 557         struct tevent_context *ev;
 558         struct tevent_req *req;
 559         NTSTATUS status = NT_STATUS_NO_MEMORY;
 560         bool ok;
 561
 562         if (smbXcli_conn_has_async_calls(conn)) {
 563                 /*
 564                  * Can't use sync call while an async call is in flight
 565                  */
 566                 status = NT_STATUS_INVALID_PARAMETER_MIX;
 567                 goto fail;
 568         }
 569         ev = samba_tevent_context_init(frame);
 570         if (ev == NULL) {
 571                 goto fail;
 572         }
 573         req = smbXcli_conn_samba_suicide_send(frame, ev, conn, exitcode);
 574         if (req == NULL) {
 575                 goto fail;
 576         }
 577         ok = tevent_req_poll(req, ev);
 578         if (!ok) {
 579                 status = map_nt_error_from_unix_common(errno);
 580                 goto fail;
 581         }
 582         status = smbXcli_conn_samba_suicide_recv(req);
 583  fail:
 584         TALLOC_FREE(frame);
 585         return status;
 586 }
 587
 588 uint32_t smb1cli_conn_capabilities(struct smbXcli_conn *conn)
 589 {
 590         return conn->smb1.capabilities;
 591 }
 592
 593 uint32_t smb1cli_conn_max_xmit(struct smbXcli_conn *conn)
 594 {
 595         return conn->smb1.max_xmit;
 596 }
 597
 598 bool smb1cli_conn_req_possible(struct smbXcli_conn *conn)
 599 {
 600         size_t pending;
 601         uint16_t possible = conn->smb1.server.max_mux;
 602
 603         pending = tevent_queue_length(conn->outgoing);
 604         if (pending >= possible) {
 605                 return false;
 606         }
 607         pending += talloc_array_length(conn->pending);
 608         if (pending >= possible) {
 609                 return false;
 610         }
 611
 612         return true;
 613 }
 614
 615 uint32_t smb1cli_conn_server_session_key(struct smbXcli_conn *conn)
 616 {
 617         return conn->smb1.server.session_key;
 618 }
 619
 620 const uint8_t *smb1cli_conn_server_challenge(struct smbXcli_conn *conn)
 621 {
 622         return conn->smb1.server.challenge;
 623 }
 624
 625 uint16_t smb1cli_conn_server_security_mode(struct smbXcli_conn *conn)
 626 {
 627         return conn->smb1.server.security_mode;
 628 }
 629
 630 bool smb1cli_conn_server_readbraw(struct smbXcli_conn *conn)
 631 {
 632         return conn->smb1.server.readbraw;
 633 }
 634
 635 bool smb1cli_conn_server_writebraw(struct smbXcli_conn *conn)
 636 {
 637         return conn->smb1.server.writebraw;
 638 }
 639
 640 bool smb1cli_conn_server_lockread(struct smbXcli_conn *conn)
 641 {
 642         return conn->smb1.server.lockread;
 643 }
 644
 645 bool smb1cli_conn_server_writeunlock(struct smbXcli_conn *conn)
 646 {
 647         return conn->smb1.server.writeunlock;
 648 }
 649
 650 int smb1cli_conn_server_time_zone(struct smbXcli_conn *conn)
 651 {
 652         return conn->smb1.server.time_zone;
 653 }
 654
 655 bool smb1cli_conn_activate_signing(struct smbXcli_conn *conn,
 656                                    const DATA_BLOB user_session_key,
 657                                    const DATA_BLOB response)
 658 {
 659         return smb_signing_activate(conn->smb1.signing,
 660                                     user_session_key,
 661                                     response);
 662 }
 663
 664 bool smb1cli_conn_check_signing(struct smbXcli_conn *conn,
 665                                 const uint8_t *buf, uint32_t seqnum)
 666 {
 667         const uint8_t *hdr = buf + NBT_HDR_SIZE;
 668         size_t len = smb_len_nbt(buf);
 669
 670         return smb_signing_check_pdu(conn->smb1.signing, hdr, len, seqnum);
 671 }
 672
 673 bool smb1cli_conn_signing_is_active(struct smbXcli_conn *conn)
 674 {
 675         return smb_signing_is_active(conn->smb1.signing);
 676 }
 677
 678 void smb1cli_conn_set_encryption(struct smbXcli_conn *conn,
 679                                  struct smb_trans_enc_state *es)
 680 {
 681         /* Replace the old state, if any. */
 682         if (conn->smb1.trans_enc) {
 683                 TALLOC_FREE(conn->smb1.trans_enc);
 684         }
 685         conn->smb1.trans_enc = es;
 686 }
 687
 688 bool smb1cli_conn_encryption_on(struct smbXcli_conn *conn)
 689 {
 690         return common_encryption_on(conn->smb1.trans_enc);
 691 }
 692
 693
 694 static NTSTATUS smb1cli_pull_raw_error(const uint8_t *hdr)
 695 {
 696         uint32_t flags2 = SVAL(hdr, HDR_FLG2);
 697         NTSTATUS status = NT_STATUS(IVAL(hdr, HDR_RCLS));
 698
 699         if (NT_STATUS_IS_OK(status)) {
 700                 return NT_STATUS_OK;
 701         }
 702
 703         if (flags2 & FLAGS2_32_BIT_ERROR_CODES) {
 704                 return status;
 705         }
 706
 707         return NT_STATUS_DOS(CVAL(hdr, HDR_RCLS), SVAL(hdr, HDR_ERR));
 708 }
 709
 710 /**
 711  * Is the SMB command able to hold an AND_X successor
 712  * @param[in] cmd       The SMB command in question
 713  * @retval Can we add a chained request after "cmd"?
 714  */
 715 bool smb1cli_is_andx_req(uint8_t cmd)
 716 {
 717         switch (cmd) {
 718         case SMBtconX:
 719         case SMBlockingX:
 720         case SMBopenX:
 721         case SMBreadX:
 722         case SMBwriteX:
 723         case SMBsesssetupX:
 724         case SMBulogoffX:
 725         case SMBntcreateX:
 726                 return true;
 727                 break;
 728         default:
 729                 break;
 730         }
 731
 732         return false;
 733 }
 734
 735 static uint16_t smb1cli_alloc_mid(struct smbXcli_conn *conn)
 736 {
 737         size_t num_pending = talloc_array_length(conn->pending);
 738         uint16_t result;
 739
 740         if (conn->protocol == PROTOCOL_NONE) {
 741                 /*
 742                  * This is what windows sends on the SMB1 Negprot request
 743                  * and some vendors reuse the SMB1 MID as SMB2 sequence number.
 744                  */
 745                 return 0;
 746         }
 747
 748         while (true) {
 749                 size_t i;
 750
 751                 result = conn->smb1.mid++;
 752                 if ((result == 0) || (result == 0xffff)) {
 753                         continue;
 754                 }
 755
 756                 for (i=0; i<num_pending; i++) {
 757                         if (result == smb1cli_req_mid(conn->pending[i])) {
 758                                 break;
 759                         }
 760                 }
 761
 762                 if (i == num_pending) {
 763                         return result;
 764                 }
 765         }
 766 }
 767
 768 void smbXcli_req_unset_pending(struct tevent_req *req)
 769 {
 770         struct smbXcli_req_state *state =
 771                 tevent_req_data(req,
 772                 struct smbXcli_req_state);
 773         struct smbXcli_conn *conn = state->conn;
 774         size_t num_pending = talloc_array_length(conn->pending);
 775         size_t i;
 776
 777         if (state->smb1.mid != 0) {
 778                 /*
 779                  * This is a [nt]trans[2] request which waits
 780                  * for more than one reply.
 781                  */
 782                 return;
 783         }
 784
 785         talloc_set_destructor(req, NULL);
 786
 787         if (num_pending == 1) {
 788                 /*
 789                  * The pending read_smb tevent_req is a child of
 790                  * conn->pending. So if nothing is pending anymore, we need to
 791                  * delete the socket read fde.
 792                  */
 793                 TALLOC_FREE(conn->pending);
 794                 conn->read_smb_req = NULL;
 795                 return;
 796         }
 797
 798         for (i=0; i<num_pending; i++) {
 799                 if (req == conn->pending[i]) {
 800                         break;
 801                 }
 802         }
 803         if (i == num_pending) {
 804                 /*
 805                  * Something's seriously broken. Just returning here is the
 806                  * right thing nevertheless, the point of this routine is to
 807                  * remove ourselves from conn->pending.
 808                  */
 809                 return;
 810         }
 811
 812         /*
 813          * Remove ourselves from the conn->pending array
 814          */
 815         for (; i < (num_pending - 1); i++) {
 816                 conn->pending[i] = conn->pending[i+1];
 817         }
 818
 819         /*
 820          * No NULL check here, we're shrinking by sizeof(void *), and
 821          * talloc_realloc just adjusts the size for this.
 822          */
 823         conn->pending = talloc_realloc(NULL, conn->pending, struct tevent_req *,
 824                                        num_pending - 1);
 825         return;
 826 }
 827
 828 static int smbXcli_req_destructor(struct tevent_req *req)
 829 {
 830         struct smbXcli_req_state *state =
 831                 tevent_req_data(req,
 832                 struct smbXcli_req_state);
 833
 834         /*
 835          * Make sure we really remove it from
 836          * the pending array on destruction.
 837          */
 838         state->smb1.mid = 0;
 839         smbXcli_req_unset_pending(req);
 840         return 0;
 841 }
 842
 843 static bool smb1cli_req_cancel(struct tevent_req *req);
 844 static bool smb2cli_req_cancel(struct tevent_req *req);
 845
 846 static bool smbXcli_req_cancel(struct tevent_req *req)
 847 {
 848         struct smbXcli_req_state *state =
 849                 tevent_req_data(req,
 850                 struct smbXcli_req_state);
 851
 852         if (!smbXcli_conn_is_connected(state->conn)) {
 853                 return false;
 854         }
 855
 856         if (state->conn->protocol == PROTOCOL_NONE) {
 857                 return false;
 858         }
 859
 860         if (state->conn->protocol >= PROTOCOL_SMB2_02) {
 861                 return smb2cli_req_cancel(req);
 862         }
 863
 864         return smb1cli_req_cancel(req);
 865 }
 866
 867 static bool smbXcli_conn_receive_next(struct smbXcli_conn *conn);
 868
 869 bool smbXcli_req_set_pending(struct tevent_req *req)
 870 {
 871         struct smbXcli_req_state *state =
 872                 tevent_req_data(req,
 873                 struct smbXcli_req_state);
 874         struct smbXcli_conn *conn;
 875         struct tevent_req **pending;
 876         size_t num_pending;
 877
 878         conn = state->conn;
 879
 880         if (!smbXcli_conn_is_connected(conn)) {
 881                 return false;
 882         }
 883
 884         num_pending = talloc_array_length(conn->pending);
 885
 886         pending = talloc_realloc(conn, conn->pending, struct tevent_req *,
 887                                  num_pending+1);
 888         if (pending == NULL) {
 889                 return false;
 890         }
 891         pending[num_pending] = req;
 892         conn->pending = pending;
 893         talloc_set_destructor(req, smbXcli_req_destructor);
 894         tevent_req_set_cancel_fn(req, smbXcli_req_cancel);
 895
 896         if (!smbXcli_conn_receive_next(conn)) {
 897                 /*
 898                  * the caller should notify the current request
 899                  *
 900                  * And all other pending requests get notified
 901                  * by smbXcli_conn_disconnect().
 902                  */
 903                 smbXcli_req_unset_pending(req);
 904                 smbXcli_conn_disconnect(conn, NT_STATUS_NO_MEMORY);
 905                 return false;
 906         }
 907
 908         return true;
 909 }
 910
 911 static void smbXcli_conn_received(struct tevent_req *subreq);
 912
 913 static bool smbXcli_conn_receive_next(struct smbXcli_conn *conn)
 914 {
 915         size_t num_pending = talloc_array_length(conn->pending);
 916         struct tevent_req *req;
 917         struct smbXcli_req_state *state;
 918
 919         if (conn->read_smb_req != NULL) {
 920                 return true;
 921         }
 922
 923         if (num_pending == 0) {
 924                 if (conn->smb2.mid < UINT64_MAX) {
 925                         /* no more pending requests, so we are done for now */
 926                         return true;
 927                 }
 928
 929                 /*
 930                  * If there are no more SMB2 requests possible,
 931                  * because we are out of message ids,
 932                  * we need to disconnect.
 933                  */
 934                 smbXcli_conn_disconnect(conn, NT_STATUS_CONNECTION_ABORTED);
 935                 return true;
 936         }
 937
 938         req = conn->pending[0];
 939         state = tevent_req_data(req, struct smbXcli_req_state);
 940
 941         /*
 942          * We're the first ones, add the read_smb request that waits for the
 943          * answer from the server
 944          */
 945         conn->read_smb_req = read_smb_send(conn->pending,
 946                                            state->ev,
 947                                            conn->read_fd);
 948         if (conn->read_smb_req == NULL) {
 949                 return false;
 950         }
 951         tevent_req_set_callback(conn->read_smb_req, smbXcli_conn_received, conn);
 952         return true;
 953 }
 954
 955 void smbXcli_conn_disconnect(struct smbXcli_conn *conn, NTSTATUS status)
 956 {
 957         struct smbXcli_session *session;
 958
 959         tevent_queue_stop(conn->outgoing);
 960
 961         if (conn->read_fd != -1) {
 962                 close(conn->read_fd);
 963         }
 964         if (conn->write_fd != -1) {
 965                 close(conn->write_fd);
 966         }
 967         conn->read_fd = -1;
 968         conn->write_fd = -1;
 969
 970         session = conn->sessions;
 971         if (talloc_array_length(conn->pending) == 0) {
 972                 /*
 973                  * if we do not have pending requests
 974                  * there is no need to update the channel_sequence
 975                  */
 976                 session = NULL;
 977         }
 978         for (; session; session = session->next) {
 979                 smb2cli_session_increment_channel_sequence(session);
 980         }
 981
 982         /*
 983          * Cancel all pending requests. We do not do a for-loop walking
 984          * conn->pending because that array changes in
 985          * smbXcli_req_unset_pending.
 986          */
 987         while (talloc_array_length(conn->pending) > 0) {
 988                 struct tevent_req *req;
 989                 struct smbXcli_req_state *state;
 990                 struct tevent_req **chain;
 991                 size_t num_chained;
 992                 size_t i;
 993
 994                 req = conn->pending[0];
 995                 state = tevent_req_data(req, struct smbXcli_req_state);
 996
 997                 if (state->smb1.chained_requests == NULL) {
 998                         /*
 999                          * We're dead. No point waiting for trans2
1000                          * replies.
1001                          */
1002                         state->smb1.mid = 0;
1003
1004                         smbXcli_req_unset_pending(req);
1005
1006                         if (NT_STATUS_IS_OK(status)) {
1007                                 /* do not notify the callers */
1008                                 continue;
1009                         }
1010
1011                         /*
1012                          * we need to defer the callback, because we may notify
1013                          * more then one caller.
1014                          */
1015                         tevent_req_defer_callback(req, state->ev);
1016                         tevent_req_nterror(req, status);
1017                         continue;
1018                 }
1019
1020                 chain = talloc_move(conn, &state->smb1.chained_requests);
1021                 num_chained = talloc_array_length(chain);
1022
1023                 for (i=0; i<num_chained; i++) {
1024                         req = chain[i];
1025                         state = tevent_req_data(req, struct smbXcli_req_state);
1026
1027                         /*
1028                          * We're dead. No point waiting for trans2
1029                          * replies.
1030                          */
1031                         state->smb1.mid = 0;
1032
1033                         smbXcli_req_unset_pending(req);
1034
1035                         if (NT_STATUS_IS_OK(status)) {
1036                                 /* do not notify the callers */
1037                                 continue;
1038                         }
1039
1040                         /*
1041                          * we need to defer the callback, because we may notify
1042                          * more than one caller.
1043                          */
1044                         tevent_req_defer_callback(req, state->ev);
1045                         tevent_req_nterror(req, status);
1046                 }
1047                 TALLOC_FREE(chain);
1048         }
1049 }
1050
1051 /*
1052  * Fetch a smb request's mid. Only valid after the request has been sent by
1053  * smb1cli_req_send().
1054  */
1055 uint16_t smb1cli_req_mid(struct tevent_req *req)
1056 {
1057         struct smbXcli_req_state *state =
1058                 tevent_req_data(req,
1059                 struct smbXcli_req_state);
1060
1061         if (state->smb1.mid != 0) {
1062                 return state->smb1.mid;
1063         }
1064
1065         return SVAL(state->smb1.hdr, HDR_MID);
1066 }
1067
1068 void smb1cli_req_set_mid(struct tevent_req *req, uint16_t mid)
1069 {
1070         struct smbXcli_req_state *state =
1071                 tevent_req_data(req,
1072                 struct smbXcli_req_state);
1073
1074         state->smb1.mid = mid;
1075 }
1076
1077 uint32_t smb1cli_req_seqnum(struct tevent_req *req)
1078 {
1079         struct smbXcli_req_state *state =
1080                 tevent_req_data(req,
1081                 struct smbXcli_req_state);
1082
1083         return state->smb1.seqnum;
1084 }
1085
1086 void smb1cli_req_set_seqnum(struct tevent_req *req, uint32_t seqnum)
1087 {
1088         struct smbXcli_req_state *state =
1089                 tevent_req_data(req,
1090                 struct smbXcli_req_state);
1091
1092         state->smb1.seqnum = seqnum;
1093 }
1094
1095 static size_t smbXcli_iov_len(const struct iovec *iov, int count)
1096 {
1097         size_t result = 0;
1098         int i;
1099         for (i=0; i<count; i++) {
1100                 result += iov[i].iov_len;
1101         }
1102         return result;
1103 }
1104
1105 static uint8_t *smbXcli_iov_concat(TALLOC_CTX *mem_ctx,
1106                                    const struct iovec *iov,
1107                                    int count)
1108 {
1109         size_t len = smbXcli_iov_len(iov, count);
1110         size_t copied;
1111         uint8_t *buf;
1112         int i;
1113
1114         buf = talloc_array(mem_ctx, uint8_t, len);
1115         if (buf == NULL) {
1116                 return NULL;
1117         }
1118         copied = 0;
1119         for (i=0; i<count; i++) {
1120                 memcpy(buf+copied, iov[i].iov_base, iov[i].iov_len);
1121                 copied += iov[i].iov_len;
1122         }
1123         return buf;
1124 }
1125
1126 static void smb1cli_req_flags(enum protocol_types protocol,
1127                               uint32_t smb1_capabilities,
1128                               uint8_t smb_command,
1129                               uint8_t additional_flags,
1130                               uint8_t clear_flags,
1131                               uint8_t *_flags,
1132                               uint16_t additional_flags2,
1133                               uint16_t clear_flags2,
1134                               uint16_t *_flags2)
1135 {
1136         uint8_t flags = 0;
1137         uint16_t flags2 = 0;
1138
1139         if (protocol >= PROTOCOL_LANMAN1) {
1140                 flags |= FLAG_CASELESS_PATHNAMES;
1141                 flags |= FLAG_CANONICAL_PATHNAMES;
1142         }
1143
1144         if (protocol >= PROTOCOL_LANMAN2) {
1145                 flags2 |= FLAGS2_LONG_PATH_COMPONENTS;
1146                 flags2 |= FLAGS2_EXTENDED_ATTRIBUTES;
1147         }
1148
1149         if (protocol >= PROTOCOL_NT1) {
1150                 flags2 |= FLAGS2_IS_LONG_NAME;
1151
1152                 if (smb1_capabilities & CAP_UNICODE) {
1153                         flags2 |= FLAGS2_UNICODE_STRINGS;
1154                 }
1155                 if (smb1_capabilities & CAP_STATUS32) {
1156                         flags2 |= FLAGS2_32_BIT_ERROR_CODES;
1157                 }
1158                 if (smb1_capabilities & CAP_EXTENDED_SECURITY) {
1159                         flags2 |= FLAGS2_EXTENDED_SECURITY;
1160                 }
1161         }
1162
1163         flags |= additional_flags;
1164         flags &= ~clear_flags;
1165         flags2 |= additional_flags2;
1166         flags2 &= ~clear_flags2;
1167
1168         *_flags = flags;
1169         *_flags2 = flags2;
1170 }
1171
1172 static void smb1cli_req_cancel_done(struct tevent_req *subreq);
1173
1174 static bool smb1cli_req_cancel(struct tevent_req *req)
1175 {
1176         struct smbXcli_req_state *state =
1177                 tevent_req_data(req,
1178                 struct smbXcli_req_state);
1179         uint8_t flags;
1180         uint16_t flags2;
1181         uint32_t pid;
1182         uint16_t mid;
1183         struct tevent_req *subreq;
1184         NTSTATUS status;
1185
1186         flags = CVAL(state->smb1.hdr, HDR_FLG);
1187         flags2 = SVAL(state->smb1.hdr, HDR_FLG2);
1188         pid  = SVAL(state->smb1.hdr, HDR_PID);
1189         pid |= SVAL(state->smb1.hdr, HDR_PIDHIGH)<<16;
1190         mid = SVAL(state->smb1.hdr, HDR_MID);
1191
1192         subreq = smb1cli_req_create(state, state->ev,
1193                                     state->conn,
1194                                     SMBntcancel,
1195                                     flags, 0,
1196                                     flags2, 0,
1197                                     0, /* timeout */
1198                                     pid,
1199                                     state->tcon,
1200                                     state->session,
1201                                     0, NULL, /* vwv */
1202                                     0, NULL); /* bytes */
1203         if (subreq == NULL) {
1204                 return false;
1205         }
1206         smb1cli_req_set_mid(subreq, mid);
1207
1208         status = smb1cli_req_chain_submit(&subreq, 1);
1209         if (!NT_STATUS_IS_OK(status)) {
1210                 TALLOC_FREE(subreq);
1211                 return false;
1212         }
1213         smb1cli_req_set_mid(subreq, 0);
1214
1215         tevent_req_set_callback(subreq, smb1cli_req_cancel_done, NULL);
1216
1217         return true;
1218 }
1219
1220 static void smb1cli_req_cancel_done(struct tevent_req *subreq)
1221 {
1222         /* we do not care about the result */
1223         TALLOC_FREE(subreq);
1224 }
1225
1226 struct tevent_req *smb1cli_req_create(TALLOC_CTX *mem_ctx,
1227                                       struct tevent_context *ev,
1228                                       struct smbXcli_conn *conn,
1229                                       uint8_t smb_command,
1230                                       uint8_t additional_flags,
1231                                       uint8_t clear_flags,
1232                                       uint16_t additional_flags2,
1233                                       uint16_t clear_flags2,
1234                                       uint32_t timeout_msec,
1235                                       uint32_t pid,
1236                                       struct smbXcli_tcon *tcon,
1237                                       struct smbXcli_session *session,
1238                                       uint8_t wct, uint16_t *vwv,
1239                                       int iov_count,
1240                                       struct iovec *bytes_iov)
1241 {
1242         struct tevent_req *req;
1243         struct smbXcli_req_state *state;
1244         uint8_t flags = 0;
1245         uint16_t flags2 = 0;
1246         uint16_t uid = 0;
1247         uint16_t tid = 0;
1248
1249         if (iov_count > MAX_SMB_IOV) {
1250                 /*
1251                  * Should not happen :-)
1252                  */
1253                 return NULL;
1254         }
1255
1256         req = tevent_req_create(mem_ctx, &state,
1257                                 struct smbXcli_req_state);
1258         if (req == NULL) {
1259                 return NULL;
1260         }
1261         state->ev = ev;
1262         state->conn = conn;
1263         state->session = session;
1264         state->tcon = tcon;
1265
1266         if (session) {
1267                 uid = session->smb1.session_id;
1268         }
1269
1270         if (tcon) {
1271                 tid = tcon->smb1.tcon_id;
1272         }
1273
1274         state->smb1.recv_cmd = 0xFF;
1275         state->smb1.recv_status = NT_STATUS_INTERNAL_ERROR;
1276         state->smb1.recv_iov = talloc_zero_array(state, struct iovec, 3);
1277         if (state->smb1.recv_iov == NULL) {
1278                 TALLOC_FREE(req);
1279                 return NULL;
1280         }
1281
1282         smb1cli_req_flags(conn->protocol,
1283                           conn->smb1.capabilities,
1284                           smb_command,
1285                           additional_flags,
1286                           clear_flags,
1287                           &flags,
1288                           additional_flags2,
1289                           clear_flags2,
1290                           &flags2);
1291
1292         SIVAL(state->smb1.hdr, 0,           SMB_MAGIC);
1293         SCVAL(state->smb1.hdr, HDR_COM,     smb_command);
1294         SIVAL(state->smb1.hdr, HDR_RCLS,    NT_STATUS_V(NT_STATUS_OK));
1295         SCVAL(state->smb1.hdr, HDR_FLG,     flags);
1296         SSVAL(state->smb1.hdr, HDR_FLG2,    flags2);
1297         SSVAL(state->smb1.hdr, HDR_PIDHIGH, pid >> 16);
1298         SSVAL(state->smb1.hdr, HDR_TID,     tid);
1299         SSVAL(state->smb1.hdr, HDR_PID,     pid);
1300         SSVAL(state->smb1.hdr, HDR_UID,     uid);
1301         SSVAL(state->smb1.hdr, HDR_MID,     0); /* this comes later */
1302         SCVAL(state->smb1.hdr, HDR_WCT,     wct);
1303
1304         state->smb1.vwv = vwv;
1305
1306         SSVAL(state->smb1.bytecount_buf, 0, smbXcli_iov_len(bytes_iov, iov_count));
1307
1308         state->smb1.iov[0].iov_base = (void *)state->length_hdr;
1309         state->smb1.iov[0].iov_len  = sizeof(state->length_hdr);
1310         state->smb1.iov[1].iov_base = (void *)state->smb1.hdr;
1311         state->smb1.iov[1].iov_len  = sizeof(state->smb1.hdr);
1312         state->smb1.iov[2].iov_base = (void *)state->smb1.vwv;
1313         state->smb1.iov[2].iov_len  = wct * sizeof(uint16_t);
1314         state->smb1.iov[3].iov_base = (void *)state->smb1.bytecount_buf;
1315         state->smb1.iov[3].iov_len  = sizeof(uint16_t);
1316
1317         if (iov_count != 0) {
1318                 memcpy(&state->smb1.iov[4], bytes_iov,
1319                        iov_count * sizeof(*bytes_iov));
1320         }
1321         state->smb1.iov_count = iov_count + 4;
1322
1323         if (timeout_msec > 0) {
1324                 struct timeval endtime;
1325
1326                 endtime = timeval_current_ofs_msec(timeout_msec);
1327                 if (!tevent_req_set_endtime(req, ev, endtime)) {
1328                         return req;
1329                 }
1330         }
1331
1332         switch (smb_command) {
1333         case SMBtranss:
1334         case SMBtranss2:
1335         case SMBnttranss:
1336                 state->one_way = true;
1337                 break;
1338         case SMBntcancel:
1339                 state->one_way = true;
1340                 state->smb1.one_way_seqnum = true;
1341                 break;
1342         case SMBlockingX:
1343                 if ((wct == 8) &&
1344                     (CVAL(vwv+3, 0) == LOCKING_ANDX_OPLOCK_RELEASE)) {
1345                         state->one_way = true;
1346                 }
1347                 break;
1348         }
1349
1350         return req;
1351 }
1352
1353 static NTSTATUS smb1cli_conn_signv(struct smbXcli_conn *conn,
1354                                    struct iovec *iov, int iov_count,
1355                                    uint32_t *seqnum,
1356                                    bool one_way_seqnum)
1357 {
1358         TALLOC_CTX *frame = NULL;
1359         uint8_t *buf;
1360
1361         /*
1362          * Obvious optimization: Make cli_calculate_sign_mac work with struct
1363          * iovec directly. MD5Update would do that just fine.
1364          */
1365
1366         if (iov_count < 4) {
1367                 return NT_STATUS_INVALID_PARAMETER_MIX;
1368         }
1369         if (iov[0].iov_len != NBT_HDR_SIZE) {
1370                 return NT_STATUS_INVALID_PARAMETER_MIX;
1371         }
1372         if (iov[1].iov_len != (MIN_SMB_SIZE-sizeof(uint16_t))) {
1373                 return NT_STATUS_INVALID_PARAMETER_MIX;
1374         }
1375         if (iov[2].iov_len > (0xFF * sizeof(uint16_t))) {
1376                 return NT_STATUS_INVALID_PARAMETER_MIX;
1377         }
1378         if (iov[3].iov_len != sizeof(uint16_t)) {
1379                 return NT_STATUS_INVALID_PARAMETER_MIX;
1380         }
1381
1382         frame = talloc_stackframe();
1383
1384         buf = smbXcli_iov_concat(frame, &iov[1], iov_count - 1);
1385         if (buf == NULL) {
1386                 return NT_STATUS_NO_MEMORY;
1387         }
1388
1389         *seqnum = smb_signing_next_seqnum(conn->smb1.signing,
1390                                           one_way_seqnum);
1391         smb_signing_sign_pdu(conn->smb1.signing,
1392                              buf, talloc_get_size(buf),
1393                              *seqnum);
1394         memcpy(iov[1].iov_base, buf, iov[1].iov_len);
1395
1396         TALLOC_FREE(frame);
1397         return NT_STATUS_OK;
1398 }
1399
1400 static void smb1cli_req_writev_done(struct tevent_req *subreq);
1401 static NTSTATUS smb1cli_conn_dispatch_incoming(struct smbXcli_conn *conn,
1402                                                TALLOC_CTX *tmp_mem,
1403                                                uint8_t *inbuf);
1404
1405 static NTSTATUS smb1cli_req_writev_submit(struct tevent_req *req,
1406                                           struct smbXcli_req_state *state,
1407                                           struct iovec *iov, int iov_count)
1408 {
1409         struct tevent_req *subreq;
1410         NTSTATUS status;
1411         uint8_t cmd;
1412         uint16_t mid;
1413
1414         if (!smbXcli_conn_is_connected(state->conn)) {
1415                 return NT_STATUS_CONNECTION_DISCONNECTED;
1416         }
1417
1418         if (state->conn->protocol > PROTOCOL_NT1) {
1419                 return NT_STATUS_REVISION_MISMATCH;
1420         }
1421
1422         if (iov_count < 4) {
1423                 return NT_STATUS_INVALID_PARAMETER_MIX;
1424         }
1425         if (iov[0].iov_len != NBT_HDR_SIZE) {
1426                 return NT_STATUS_INVALID_PARAMETER_MIX;
1427         }
1428         if (iov[1].iov_len != (MIN_SMB_SIZE-sizeof(uint16_t))) {
1429                 return NT_STATUS_INVALID_PARAMETER_MIX;
1430         }
1431         if (iov[2].iov_len > (0xFF * sizeof(uint16_t))) {
1432                 return NT_STATUS_INVALID_PARAMETER_MIX;
1433         }
1434         if (iov[3].iov_len != sizeof(uint16_t)) {
1435                 return NT_STATUS_INVALID_PARAMETER_MIX;
1436         }
1437
1438         cmd = CVAL(iov[1].iov_base, HDR_COM);
1439         if (cmd == SMBreadBraw) {
1440                 if (smbXcli_conn_has_async_calls(state->conn)) {
1441                         return NT_STATUS_INVALID_PARAMETER_MIX;
1442                 }
1443                 state->conn->smb1.read_braw_req = req;
1444         }
1445
1446         if (state->smb1.mid != 0) {
1447                 mid = state->smb1.mid;
1448         } else {
1449                 mid = smb1cli_alloc_mid(state->conn);
1450         }
1451         SSVAL(iov[1].iov_base, HDR_MID, mid);
1452
1453         _smb_setlen_nbt(iov[0].iov_base, smbXcli_iov_len(&iov[1], iov_count-1));
1454
1455         status = smb1cli_conn_signv(state->conn, iov, iov_count,
1456                                     &state->smb1.seqnum,
1457                                     state->smb1.one_way_seqnum);
1458
1459         if (!NT_STATUS_IS_OK(status)) {
1460                 return status;
1461         }
1462
1463         /*
1464          * If we supported multiple encrytion contexts
1465          * here we'd look up based on tid.
1466          */
1467         if (common_encryption_on(state->conn->smb1.trans_enc)) {
1468                 char *buf, *enc_buf;
1469
1470                 buf = (char *)smbXcli_iov_concat(talloc_tos(), iov, iov_count);
1471                 if (buf == NULL) {
1472                         return NT_STATUS_NO_MEMORY;
1473                 }
1474                 status = common_encrypt_buffer(state->conn->smb1.trans_enc,
1475                                                (char *)buf, &enc_buf);
1476                 TALLOC_FREE(buf);
1477                 if (!NT_STATUS_IS_OK(status)) {
1478                         DEBUG(0, ("Error in encrypting client message: %s\n",
1479                                   nt_errstr(status)));
1480                         return status;
1481                 }
1482                 buf = (char *)talloc_memdup(state, enc_buf,
1483                                             smb_len_nbt(enc_buf)+4);
1484                 SAFE_FREE(enc_buf);
1485                 if (buf == NULL) {
1486                         return NT_STATUS_NO_MEMORY;
1487                 }
1488                 iov[0].iov_base = (void *)buf;
1489                 iov[0].iov_len = talloc_get_size(buf);
1490                 iov_count = 1;
1491         }
1492
1493         if (state->conn->dispatch_incoming == NULL) {
1494                 state->conn->dispatch_incoming = smb1cli_conn_dispatch_incoming;
1495         }
1496
1497         tevent_req_set_cancel_fn(req, smbXcli_req_cancel);
1498
1499         subreq = writev_send(state, state->ev, state->conn->outgoing,
1500                              state->conn->write_fd, false, iov, iov_count);
1501         if (subreq == NULL) {
1502                 return NT_STATUS_NO_MEMORY;
1503         }
1504         tevent_req_set_callback(subreq, smb1cli_req_writev_done, req);
1505         return NT_STATUS_OK;
1506 }
1507
1508 struct tevent_req *smb1cli_req_send(TALLOC_CTX *mem_ctx,
1509                                     struct tevent_context *ev,
1510                                     struct smbXcli_conn *conn,
1511                                     uint8_t smb_command,
1512                                     uint8_t additional_flags,
1513                                     uint8_t clear_flags,
1514                                     uint16_t additional_flags2,
1515                                     uint16_t clear_flags2,
1516                                     uint32_t timeout_msec,
1517                                     uint32_t pid,
1518                                     struct smbXcli_tcon *tcon,
1519                                     struct smbXcli_session *session,
1520                                     uint8_t wct, uint16_t *vwv,
1521                                     uint32_t num_bytes,
1522                                     const uint8_t *bytes)
1523 {
1524         struct tevent_req *req;
1525         struct iovec iov;
1526         NTSTATUS status;
1527
1528         iov.iov_base = discard_const_p(void, bytes);
1529         iov.iov_len = num_bytes;
1530
1531         req = smb1cli_req_create(mem_ctx, ev, conn, smb_command,
1532                                  additional_flags, clear_flags,
1533                                  additional_flags2, clear_flags2,
1534                                  timeout_msec,
1535                                  pid, tcon, session,
1536                                  wct, vwv, 1, &iov);
1537         if (req == NULL) {
1538                 return NULL;
1539         }
1540         if (!tevent_req_is_in_progress(req)) {
1541                 return tevent_req_post(req, ev);
1542         }
1543         status = smb1cli_req_chain_submit(&req, 1);
1544         if (tevent_req_nterror(req, status)) {
1545                 return tevent_req_post(req, ev);
1546         }
1547         return req;
1548 }
1549
1550 static void smb1cli_req_writev_done(struct tevent_req *subreq)
1551 {
1552         struct tevent_req *req =
1553                 tevent_req_callback_data(subreq,
1554                 struct tevent_req);
1555         struct smbXcli_req_state *state =
1556                 tevent_req_data(req,
1557                 struct smbXcli_req_state);
1558         ssize_t nwritten;
1559         int err;
1560
1561         nwritten = writev_recv(subreq, &err);
1562         TALLOC_FREE(subreq);
1563         if (nwritten == -1) {
1564                 NTSTATUS status = map_nt_error_from_unix_common(err);
1565                 smbXcli_conn_disconnect(state->conn, status);
1566                 return;
1567         }
1568
1569         if (state->one_way) {
1570                 state->inbuf = NULL;
1571                 tevent_req_done(req);
1572                 return;
1573         }
1574
1575         if (!smbXcli_req_set_pending(req)) {
1576                 tevent_req_nterror(req, NT_STATUS_NO_MEMORY);
1577                 return;
1578         }
1579 }
1580
1581 static void smbXcli_conn_received(struct tevent_req *subreq)
1582 {
1583         struct smbXcli_conn *conn =
1584                 tevent_req_callback_data(subreq,
1585                 struct smbXcli_conn);
1586         TALLOC_CTX *frame = talloc_stackframe();
1587         NTSTATUS status;
1588         uint8_t *inbuf;
1589         ssize_t received;
1590         int err;
1591
1592         if (subreq != conn->read_smb_req) {
1593                 DEBUG(1, ("Internal error: cli_smb_received called with "
1594                           "unexpected subreq\n"));
1595                 smbXcli_conn_disconnect(conn, NT_STATUS_INTERNAL_ERROR);
1596                 TALLOC_FREE(frame);
1597                 return;
1598         }
1599         conn->read_smb_req = NULL;
1600
1601         received = read_smb_recv(subreq, frame, &inbuf, &err);
1602         TALLOC_FREE(subreq);
1603         if (received == -1) {
1604                 status = map_nt_error_from_unix_common(err);
1605                 smbXcli_conn_disconnect(conn, status);
1606                 TALLOC_FREE(frame);
1607                 return;
1608         }
1609
1610         status = conn->dispatch_incoming(conn, frame, inbuf);
1611         TALLOC_FREE(frame);
1612         if (NT_STATUS_IS_OK(status)) {
1613                 /*
1614                  * We should not do any more processing
1615                  * as the dispatch function called
1616                  * tevent_req_done().
1617                  */
1618                 return;
1619         }
1620
1621         if (!NT_STATUS_EQUAL(status, NT_STATUS_RETRY)) {
1622                 /*
1623                  * We got an error, so notify all pending requests
1624                  */
1625                 smbXcli_conn_disconnect(conn, status);
1626                 return;
1627         }
1628
1629         /*
1630          * We got NT_STATUS_RETRY, so we may ask for a
1631          * next incoming pdu.
1632          */
1633         if (!smbXcli_conn_receive_next(conn)) {
1634                 smbXcli_conn_disconnect(conn, NT_STATUS_NO_MEMORY);
1635         }
1636 }
1637
1638 static NTSTATUS smb1cli_inbuf_parse_chain(uint8_t *buf, TALLOC_CTX *mem_ctx,
1639                                           struct iovec **piov, int *pnum_iov)
1640 {
1641         struct iovec *iov;
1642         int num_iov;
1643         size_t buflen;
1644         size_t taken;
1645         size_t remaining;
1646         uint8_t *hdr;
1647         uint8_t cmd;
1648         uint32_t wct_ofs;
1649         NTSTATUS status;
1650         size_t min_size = MIN_SMB_SIZE;
1651
1652         buflen = smb_len_tcp(buf);
1653         taken = 0;
1654
1655         hdr = buf + NBT_HDR_SIZE;
1656
1657         status = smb1cli_pull_raw_error(hdr);
1658         if (NT_STATUS_IS_ERR(status)) {
1659                 /*
1660                  * This is an ugly hack to support OS/2
1661                  * which skips the byte_count in the DATA block
1662                  * on some error responses.
1663                  *
1664                  * See bug #9096
1665                  */
1666                 min_size -= sizeof(uint16_t);
1667         }
1668
1669         if (buflen < min_size) {
1670                 return NT_STATUS_INVALID_NETWORK_RESPONSE;
1671         }
1672
1673         /*
1674          * This returns iovec elements in the following order:
1675          *
1676          * - SMB header
1677          *
1678          * - Parameter Block
1679          * - Data Block
1680          *
1681          * - Parameter Block
1682          * - Data Block
1683          *
1684          * - Parameter Block
1685          * - Data Block
1686          */
1687         num_iov = 1;
1688
1689         iov = talloc_array(mem_ctx, struct iovec, num_iov);
1690         if (iov == NULL) {
1691                 return NT_STATUS_NO_MEMORY;
1692         }
1693         iov[0].iov_base = hdr;
1694         iov[0].iov_len = HDR_WCT;
1695         taken += HDR_WCT;
1696
1697         cmd = CVAL(hdr, HDR_COM);
1698         wct_ofs = HDR_WCT;
1699
1700         while (true) {
1701                 size_t len = buflen - taken;
1702                 struct iovec *cur;
1703                 struct iovec *iov_tmp;
1704                 uint8_t wct;
1705                 uint32_t bcc_ofs;
1706                 uint16_t bcc;
1707                 size_t needed;
1708
1709                 /*
1710                  * we need at least WCT
1711                  */
1712                 needed = sizeof(uint8_t);
1713                 if (len < needed) {
1714                         DEBUG(10, ("%s: %d bytes left, expected at least %d\n",
1715                                    __location__, (int)len, (int)needed));
1716                         goto inval;
1717                 }
1718
1719                 /*
1720                  * Now we check if the specified words are there
1721                  */
1722                 wct = CVAL(hdr, wct_ofs);
1723                 needed += wct * sizeof(uint16_t);
1724                 if (len < needed) {
1725                         DEBUG(10, ("%s: %d bytes left, expected at least %d\n",
1726                                    __location__, (int)len, (int)needed));
1727                         goto inval;
1728                 }
1729
1730                 if ((num_iov == 1) &&
1731                     (len == needed) &&
1732                     NT_STATUS_IS_ERR(status))
1733                 {
1734                         /*
1735                          * This is an ugly hack to support OS/2
1736                          * which skips the byte_count in the DATA block
1737                          * on some error responses.
1738                          *
1739                          * See bug #9096
1740                          */
1741                         iov_tmp = talloc_realloc(mem_ctx, iov, struct iovec,
1742                                                  num_iov + 2);
1743                         if (iov_tmp == NULL) {
1744                                 TALLOC_FREE(iov);
1745                                 return NT_STATUS_NO_MEMORY;
1746                         }
1747                         iov = iov_tmp;
1748                         cur = &iov[num_iov];
1749                         num_iov += 2;
1750
1751                         cur[0].iov_len = 0;
1752                         cur[0].iov_base = hdr + (wct_ofs + sizeof(uint8_t));
1753                         cur[1].iov_len = 0;
1754                         cur[1].iov_base = cur[0].iov_base;
1755
1756                         taken += needed;
1757                         break;
1758                 }
1759
1760                 /*
1761                  * we need at least BCC
1762                  */
1763                 needed += sizeof(uint16_t);
1764                 if (len < needed) {
1765                         DEBUG(10, ("%s: %d bytes left, expected at least %d\n",
1766                                    __location__, (int)len, (int)needed));
1767                         goto inval;
1768                 }
1769
1770                 /*
1771                  * Now we check if the specified bytes are there
1772                  */
1773                 bcc_ofs = wct_ofs + sizeof(uint8_t) + wct * sizeof(uint16_t);
1774                 bcc = SVAL(hdr, bcc_ofs);
1775                 needed += bcc * sizeof(uint8_t);
1776                 if (len < needed) {
1777                         DEBUG(10, ("%s: %d bytes left, expected at least %d\n",
1778                                    __location__, (int)len, (int)needed));
1779                         goto inval;
1780                 }
1781
1782                 /*
1783                  * we allocate 2 iovec structures for words and bytes
1784                  */
1785                 iov_tmp = talloc_realloc(mem_ctx, iov, struct iovec,
1786                                          num_iov + 2);
1787                 if (iov_tmp == NULL) {
1788                         TALLOC_FREE(iov);
1789                         return NT_STATUS_NO_MEMORY;
1790                 }
1791                 iov = iov_tmp;
1792                 cur = &iov[num_iov];
1793                 num_iov += 2;
1794
1795                 cur[0].iov_len = wct * sizeof(uint16_t);
1796                 cur[0].iov_base = hdr + (wct_ofs + sizeof(uint8_t));
1797                 cur[1].iov_len = bcc * sizeof(uint8_t);
1798                 cur[1].iov_base = hdr + (bcc_ofs + sizeof(uint16_t));
1799
1800                 taken += needed;
1801
1802                 if (!smb1cli_is_andx_req(cmd)) {
1803                         /*
1804                          * If the current command does not have AndX chanining
1805                          * we are done.
1806                          */
1807                         break;
1808                 }
1809
1810                 if (wct == 0 && bcc == 0) {
1811                         /*
1812                          * An empty response also ends the chain,
1813                          * most likely with an error.
1814                          */
1815                         break;
1816                 }
1817
1818                 if (wct < 2) {
1819                         DEBUG(10, ("%s: wct[%d] < 2 for cmd[0x%02X]\n",
1820                                    __location__, (int)wct, (int)cmd));
1821                         goto inval;
1822                 }
1823                 cmd = CVAL(cur[0].iov_base, 0);
1824                 if (cmd == 0xFF) {
1825                         /*
1826                          * If it is the end of the chain we are also done.
1827                          */
1828                         break;
1829                 }
1830                 wct_ofs = SVAL(cur[0].iov_base, 2);
1831
1832                 if (wct_ofs < taken) {
1833                         return NT_STATUS_INVALID_NETWORK_RESPONSE;
1834                 }
1835                 if (wct_ofs > buflen) {
1836                         return NT_STATUS_INVALID_NETWORK_RESPONSE;
1837                 }
1838
1839                 /*
1840                  * we consumed everything up to the start of the next
1841                  * parameter block.
1842                  */
1843                 taken = wct_ofs;
1844         }
1845
1846         remaining = buflen - taken;
1847
1848         if (remaining > 0 && num_iov >= 3) {
1849                 /*
1850                  * The last DATA block gets the remaining
1851                  * bytes, this is needed to support
1852                  * CAP_LARGE_WRITEX and CAP_LARGE_READX.
1853                  */
1854                 iov[num_iov-1].iov_len += remaining;
1855         }
1856
1857         *piov = iov;
1858         *pnum_iov = num_iov;
1859         return NT_STATUS_OK;
1860
1861 inval:
1862         TALLOC_FREE(iov);
1863         return NT_STATUS_INVALID_NETWORK_RESPONSE;
1864 }
1865
1866 static NTSTATUS smb1cli_conn_dispatch_incoming(struct smbXcli_conn *conn,
1867                                                TALLOC_CTX *tmp_mem,
1868                                                uint8_t *inbuf)
1869 {
1870         struct tevent_req *req;
1871         struct smbXcli_req_state *state;
1872         NTSTATUS status;
1873         size_t num_pending;
1874         size_t i;
1875         uint8_t cmd;
1876         uint16_t mid;
1877         bool oplock_break;
1878         uint8_t *inhdr = inbuf + NBT_HDR_SIZE;
1879         size_t len = smb_len_tcp(inbuf);
1880         struct iovec *iov = NULL;
1881         int num_iov = 0;
1882         struct tevent_req **chain = NULL;
1883         size_t num_chained = 0;
1884         size_t num_responses = 0;
1885
1886         if (conn->smb1.read_braw_req != NULL) {
1887                 req = conn->smb1.read_braw_req;
1888                 conn->smb1.read_braw_req = NULL;
1889                 state = tevent_req_data(req, struct smbXcli_req_state);
1890
1891                 smbXcli_req_unset_pending(req);
1892
1893                 if (state->smb1.recv_iov == NULL) {
1894                         /*
1895                          * For requests with more than
1896                          * one response, we have to readd the
1897                          * recv_iov array.
1898                          */
1899                         state->smb1.recv_iov = talloc_zero_array(state,
1900                                                                  struct iovec,
1901                                                                  3);
1902                         if (tevent_req_nomem(state->smb1.recv_iov, req)) {
1903                                 return NT_STATUS_OK;
1904                         }
1905                 }
1906
1907                 state->smb1.recv_iov[0].iov_base = (void *)(inhdr);
1908                 state->smb1.recv_iov[0].iov_len = len;
1909                 ZERO_STRUCT(state->smb1.recv_iov[1]);
1910                 ZERO_STRUCT(state->smb1.recv_iov[2]);
1911
1912                 state->smb1.recv_cmd = SMBreadBraw;
1913                 state->smb1.recv_status = NT_STATUS_OK;
1914                 state->inbuf = talloc_move(state->smb1.recv_iov, &inbuf);
1915
1916                 tevent_req_done(req);
1917                 return NT_STATUS_OK;
1918         }
1919
1920         if ((IVAL(inhdr, 0) != SMB_MAGIC) /* 0xFF"SMB" */
1921             && (SVAL(inhdr, 0) != 0x45ff)) /* 0xFF"E" */ {
1922                 DEBUG(10, ("Got non-SMB PDU\n"));
1923                 return NT_STATUS_INVALID_NETWORK_RESPONSE;
1924         }
1925
1926         /*
1927          * If we supported multiple encrytion contexts
1928          * here we'd look up based on tid.
1929          */
1930         if (common_encryption_on(conn->smb1.trans_enc)
1931             && (CVAL(inbuf, 0) == 0)) {
1932                 uint16_t enc_ctx_num;
1933
1934                 status = get_enc_ctx_num(inbuf, &enc_ctx_num);
1935                 if (!NT_STATUS_IS_OK(status)) {
1936                         DEBUG(10, ("get_enc_ctx_num returned %s\n",
1937                                    nt_errstr(status)));
1938                         return status;
1939                 }
1940
1941                 if (enc_ctx_num != conn->smb1.trans_enc->enc_ctx_num) {
1942                         DEBUG(10, ("wrong enc_ctx %d, expected %d\n",
1943                                    enc_ctx_num,
1944                                    conn->smb1.trans_enc->enc_ctx_num));
1945                         return NT_STATUS_INVALID_HANDLE;
1946                 }
1947
1948                 status = common_decrypt_buffer(conn->smb1.trans_enc,
1949                                                (char *)inbuf);
1950                 if (!NT_STATUS_IS_OK(status)) {
1951                         DEBUG(10, ("common_decrypt_buffer returned %s\n",
1952                                    nt_errstr(status)));
1953                         return status;
1954                 }
1955                 inhdr = inbuf + NBT_HDR_SIZE;
1956                 len = smb_len_nbt(inbuf);
1957         }
1958
1959         mid = SVAL(inhdr, HDR_MID);
1960         num_pending = talloc_array_length(conn->pending);
1961
1962         for (i=0; i<num_pending; i++) {
1963                 if (mid == smb1cli_req_mid(conn->pending[i])) {
1964                         break;
1965                 }
1966         }
1967         if (i == num_pending) {
1968                 /* Dump unexpected reply */
1969                 return NT_STATUS_RETRY;
1970         }
1971
1972         oplock_break = false;
1973
1974         if (mid == 0xffff) {
1975                 /*
1976                  * Paranoia checks that this is really an oplock break request.
1977                  */
1978                 oplock_break = (len == 51); /* hdr + 8 words */
1979                 oplock_break &= ((CVAL(inhdr, HDR_FLG) & FLAG_REPLY) == 0);
1980                 oplock_break &= (CVAL(inhdr, HDR_COM) == SMBlockingX);
1981                 oplock_break &= (SVAL(inhdr, HDR_VWV+VWV(6)) == 0);
1982                 oplock_break &= (SVAL(inhdr, HDR_VWV+VWV(7)) == 0);
1983
1984                 if (!oplock_break) {
1985                         /* Dump unexpected reply */
1986                         return NT_STATUS_RETRY;
1987                 }
1988         }
1989
1990         req = conn->pending[i];
1991         state = tevent_req_data(req, struct smbXcli_req_state);
1992
1993         if (!oplock_break /* oplock breaks are not signed */
1994             && !smb_signing_check_pdu(conn->smb1.signing,
1995                                       inhdr, len, state->smb1.seqnum+1)) {
1996                 DEBUG(10, ("cli_check_sign_mac failed\n"));
1997                 return NT_STATUS_ACCESS_DENIED;
1998         }
1999
2000         status = smb1cli_inbuf_parse_chain(inbuf, tmp_mem,
2001                                            &iov, &num_iov);
2002         if (!NT_STATUS_IS_OK(status)) {
2003                 DEBUG(10,("smb1cli_inbuf_parse_chain - %s\n",
2004                           nt_errstr(status)));
2005                 return status;
2006         }
2007
2008         cmd = CVAL(inhdr, HDR_COM);
2009         status = smb1cli_pull_raw_error(inhdr);
2010
2011         if (NT_STATUS_EQUAL(status, NT_STATUS_NETWORK_SESSION_EXPIRED) &&
2012             (state->session != NULL) && state->session->disconnect_expired)
2013         {
2014                 /*
2015                  * this should be a short term hack
2016                  * until the upper layers have implemented
2017                  * re-authentication.
2018                  */
2019                 return status;
2020         }
2021
2022         if (state->smb1.chained_requests == NULL) {
2023                 if (num_iov != 3) {
2024                         return NT_STATUS_INVALID_NETWORK_RESPONSE;
2025                 }
2026
2027                 smbXcli_req_unset_pending(req);
2028
2029                 if (state->smb1.recv_iov == NULL) {
2030                         /*
2031                          * For requests with more than
2032                          * one response, we have to readd the
2033                          * recv_iov array.
2034                          */
2035                         state->smb1.recv_iov = talloc_zero_array(state,
2036                                                                  struct iovec,
2037                                                                  3);
2038                         if (tevent_req_nomem(state->smb1.recv_iov, req)) {
2039                                 return NT_STATUS_OK;
2040                         }
2041                 }
2042
2043                 state->smb1.recv_cmd = cmd;
2044                 state->smb1.recv_status = status;
2045                 state->inbuf = talloc_move(state->smb1.recv_iov, &inbuf);
2046
2047                 state->smb1.recv_iov[0] = iov[0];
2048                 state->smb1.recv_iov[1] = iov[1];
2049                 state->smb1.recv_iov[2] = iov[2];
2050
2051                 if (talloc_array_length(conn->pending) == 0) {
2052                         tevent_req_done(req);
2053                         return NT_STATUS_OK;
2054                 }
2055
2056                 tevent_req_defer_callback(req, state->ev);
2057                 tevent_req_done(req);
2058                 return NT_STATUS_RETRY;
2059         }
2060
2061         chain = talloc_move(tmp_mem, &state->smb1.chained_requests);
2062         num_chained = talloc_array_length(chain);
2063         num_responses = (num_iov - 1)/2;
2064
2065         if (num_responses > num_chained) {
2066                 return NT_STATUS_INVALID_NETWORK_RESPONSE;
2067         }
2068
2069         for (i=0; i<num_chained; i++) {
2070                 size_t iov_idx = 1 + (i*2);
2071                 struct iovec *cur = &iov[iov_idx];
2072                 uint8_t *inbuf_ref;
2073
2074                 req = chain[i];
2075                 state = tevent_req_data(req, struct smbXcli_req_state);
2076
2077                 smbXcli_req_unset_pending(req);
2078
2079                 /*
2080                  * as we finish multiple requests here
2081                  * we need to defer the callbacks as
2082                  * they could destroy our current stack state.
2083                  */
2084                 tevent_req_defer_callback(req, state->ev);
2085
2086                 if (i >= num_responses) {
2087                         tevent_req_nterror(req, NT_STATUS_REQUEST_ABORTED);
2088                         continue;
2089                 }
2090
2091                 if (state->smb1.recv_iov == NULL) {
2092                         /*
2093                          * For requests with more than
2094                          * one response, we have to readd the
2095                          * recv_iov array.
2096                          */
2097                         state->smb1.recv_iov = talloc_zero_array(state,
2098                                                                  struct iovec,
2099                                                                  3);
2100                         if (tevent_req_nomem(state->smb1.recv_iov, req)) {
2101                                 continue;
2102                         }
2103                 }
2104
2105                 state->smb1.recv_cmd = cmd;
2106
2107                 if (i == (num_responses - 1)) {
2108                         /*
2109                          * The last request in the chain gets the status
2110                          */
2111                         state->smb1.recv_status = status;
2112                 } else {
2113                         cmd = CVAL(cur[0].iov_base, 0);
2114                         state->smb1.recv_status = NT_STATUS_OK;
2115                 }
2116
2117                 state->inbuf = inbuf;
2118
2119                 /*
2120                  * Note: here we use talloc_reference() in a way
2121                  *       that does not expose it to the caller.
2122                  */
2123                 inbuf_ref = talloc_reference(state->smb1.recv_iov, inbuf);
2124                 if (tevent_req_nomem(inbuf_ref, req)) {
2125                         continue;
2126                 }
2127
2128                 /* copy the related buffers */
2129                 state->smb1.recv_iov[0] = iov[0];
2130                 state->smb1.recv_iov[1] = cur[0];
2131                 state->smb1.recv_iov[2] = cur[1];
2132
2133                 tevent_req_done(req);
2134         }
2135
2136         return NT_STATUS_RETRY;
2137 }
2138
2139 NTSTATUS smb1cli_req_recv(struct tevent_req *req,
2140                           TALLOC_CTX *mem_ctx,
2141                           struct iovec **piov,
2142                           uint8_t **phdr,
2143                           uint8_t *pwct,
2144                           uint16_t **pvwv,
2145                           uint32_t *pvwv_offset,
2146                           uint32_t *pnum_bytes,
2147                           uint8_t **pbytes,
2148                           uint32_t *pbytes_offset,
2149                           uint8_t **pinbuf,
2150                           const struct smb1cli_req_expected_response *expected,
2151                           size_t num_expected)
2152 {
2153         struct smbXcli_req_state *state =
2154                 tevent_req_data(req,
2155                 struct smbXcli_req_state);
2156         NTSTATUS status = NT_STATUS_OK;
2157         struct iovec *recv_iov = NULL;
2158         uint8_t *hdr = NULL;
2159         uint8_t wct = 0;
2160         uint32_t vwv_offset = 0;
2161         uint16_t *vwv = NULL;
2162         uint32_t num_bytes = 0;
2163         uint32_t bytes_offset = 0;
2164         uint8_t *bytes = NULL;
2165         size_t i;
2166         bool found_status = false;
2167         bool found_size = false;
2168
2169         if (piov != NULL) {
2170                 *piov = NULL;
2171         }
2172         if (phdr != NULL) {
2173                 *phdr = 0;
2174         }
2175         if (pwct != NULL) {
2176                 *pwct = 0;
2177         }
2178         if (pvwv != NULL) {
2179                 *pvwv = NULL;
2180         }
2181         if (pvwv_offset != NULL) {
2182                 *pvwv_offset = 0;
2183         }
2184         if (pnum_bytes != NULL) {
2185                 *pnum_bytes = 0;
2186         }
2187         if (pbytes != NULL) {
2188                 *pbytes = NULL;
2189         }
2190         if (pbytes_offset != NULL) {
2191                 *pbytes_offset = 0;
2192         }
2193         if (pinbuf != NULL) {
2194                 *pinbuf = NULL;
2195         }
2196
2197         if (state->inbuf != NULL) {
2198                 recv_iov = state->smb1.recv_iov;
2199                 state->smb1.recv_iov = NULL;
2200                 if (state->smb1.recv_cmd != SMBreadBraw) {
2201                         hdr = (uint8_t *)recv_iov[0].iov_base;
2202                         wct = recv_iov[1].iov_len/2;
2203                         vwv = (uint16_t *)recv_iov[1].iov_base;
2204                         vwv_offset = PTR_DIFF(vwv, hdr);
2205                         num_bytes = recv_iov[2].iov_len;
2206                         bytes = (uint8_t *)recv_iov[2].iov_base;
2207                         bytes_offset = PTR_DIFF(bytes, hdr);
2208                 }
2209         }
2210
2211         if (tevent_req_is_nterror(req, &status)) {
2212                 for (i=0; i < num_expected; i++) {
2213                         if (NT_STATUS_EQUAL(status, expected[i].status)) {
2214                                 found_status = true;
2215                                 break;
2216                         }
2217                 }
2218
2219                 if (found_status) {
2220                         return NT_STATUS_UNEXPECTED_NETWORK_ERROR;
2221                 }
2222
2223                 return status;
2224         }
2225
2226         if (num_expected == 0) {
2227                 found_status = true;
2228                 found_size = true;
2229         }
2230
2231         status = state->smb1.recv_status;
2232
2233         for (i=0; i < num_expected; i++) {
2234                 if (!NT_STATUS_EQUAL(status, expected[i].status)) {
2235                         continue;
2236                 }
2237
2238                 found_status = true;
2239                 if (expected[i].wct == 0) {
2240                         found_size = true;
2241                         break;
2242                 }
2243
2244                 if (expected[i].wct == wct) {
2245                         found_size = true;
2246                         break;
2247                 }
2248         }
2249
2250         if (!found_status) {
2251                 return status;
2252         }
2253
2254         if (!found_size) {
2255                 return NT_STATUS_INVALID_NETWORK_RESPONSE;
2256         }
2257
2258         if (piov != NULL) {
2259                 *piov = talloc_move(mem_ctx, &recv_iov);
2260         }
2261
2262         if (phdr != NULL) {
2263                 *phdr = hdr;
2264         }
2265         if (pwct != NULL) {
2266                 *pwct = wct;
2267         }
2268         if (pvwv != NULL) {
2269                 *pvwv = vwv;
2270         }
2271         if (pvwv_offset != NULL) {
2272                 *pvwv_offset = vwv_offset;
2273         }
2274         if (pnum_bytes != NULL) {
2275                 *pnum_bytes = num_bytes;
2276         }
2277         if (pbytes != NULL) {
2278                 *pbytes = bytes;
2279         }
2280         if (pbytes_offset != NULL) {
2281                 *pbytes_offset = bytes_offset;
2282         }
2283         if (pinbuf != NULL) {
2284                 *pinbuf = state->inbuf;
2285         }
2286
2287         return status;
2288 }
2289
2290 size_t smb1cli_req_wct_ofs(struct tevent_req **reqs, int num_reqs)
2291 {
2292         size_t wct_ofs;
2293         int i;
2294
2295         wct_ofs = HDR_WCT;
2296
2297         for (i=0; i<num_reqs; i++) {
2298                 struct smbXcli_req_state *state;
2299                 state = tevent_req_data(reqs[i], struct smbXcli_req_state);
2300                 wct_ofs += smbXcli_iov_len(state->smb1.iov+2,
2301                                            state->smb1.iov_count-2);
2302                 wct_ofs = (wct_ofs + 3) & ~3;
2303         }
2304         return wct_ofs;
2305 }
2306
2307 NTSTATUS smb1cli_req_chain_submit(struct tevent_req **reqs, int num_reqs)
2308 {
2309         struct smbXcli_req_state *first_state =
2310                 tevent_req_data(reqs[0],
2311                 struct smbXcli_req_state);
2312         struct smbXcli_req_state *state;
2313         size_t wct_offset;
2314         size_t chain_padding = 0;
2315         int i, iovlen;
2316         struct iovec *iov = NULL;
2317         struct iovec *this_iov;
2318         NTSTATUS status;
2319         size_t nbt_len;
2320
2321         if (num_reqs == 1) {
2322                 return smb1cli_req_writev_submit(reqs[0], first_state,
2323                                                  first_state->smb1.iov,
2324                                                  first_state->smb1.iov_count);
2325         }
2326
2327         iovlen = 0;
2328         for (i=0; i<num_reqs; i++) {
2329                 if (!tevent_req_is_in_progress(reqs[i])) {
2330                         return NT_STATUS_INTERNAL_ERROR;
2331                 }
2332
2333                 state = tevent_req_data(reqs[i], struct smbXcli_req_state);
2334
2335                 if (state->smb1.iov_count < 4) {
2336                         return NT_STATUS_INVALID_PARAMETER_MIX;
2337                 }
2338
2339                 if (i == 0) {
2340                         /*
2341                          * The NBT and SMB header
2342                          */
2343                         iovlen += 2;
2344                 } else {
2345                         /*
2346                          * Chain padding
2347                          */
2348                         iovlen += 1;
2349                 }
2350
2351                 /*
2352                  * words and bytes
2353                  */
2354                 iovlen += state->smb1.iov_count - 2;
2355         }
2356
2357         iov = talloc_zero_array(first_state, struct iovec, iovlen);
2358         if (iov == NULL) {
2359                 return NT_STATUS_NO_MEMORY;
2360         }
2361
2362         first_state->smb1.chained_requests = (struct tevent_req **)talloc_memdup(
2363                 first_state, reqs, sizeof(*reqs) * num_reqs);
2364         if (first_state->smb1.chained_requests == NULL) {
2365                 TALLOC_FREE(iov);
2366                 return NT_STATUS_NO_MEMORY;
2367         }
2368
2369         wct_offset = HDR_WCT;
2370         this_iov = iov;
2371
2372         for (i=0; i<num_reqs; i++) {
2373                 size_t next_padding = 0;
2374                 uint16_t *vwv;
2375
2376                 state = tevent_req_data(reqs[i], struct smbXcli_req_state);
2377
2378                 if (i < num_reqs-1) {
2379                         if (!smb1cli_is_andx_req(CVAL(state->smb1.hdr, HDR_COM))
2380                             || CVAL(state->smb1.hdr, HDR_WCT) < 2) {
2381                                 TALLOC_FREE(iov);
2382                                 TALLOC_FREE(first_state->smb1.chained_requests);
2383                                 return NT_STATUS_INVALID_PARAMETER_MIX;
2384                         }
2385                 }
2386
2387                 wct_offset += smbXcli_iov_len(state->smb1.iov+2,
2388                                               state->smb1.iov_count-2) + 1;
2389                 if ((wct_offset % 4) != 0) {
2390                         next_padding = 4 - (wct_offset % 4);
2391                 }
2392                 wct_offset += next_padding;
2393                 vwv = state->smb1.vwv;
2394
2395                 if (i < num_reqs-1) {
2396                         struct smbXcli_req_state *next_state =
2397                                 tevent_req_data(reqs[i+1],
2398                                 struct smbXcli_req_state);
2399                         SCVAL(vwv+0, 0, CVAL(next_state->smb1.hdr, HDR_COM));
2400                         SCVAL(vwv+0, 1, 0);
2401                         SSVAL(vwv+1, 0, wct_offset);
2402                 } else if (smb1cli_is_andx_req(CVAL(state->smb1.hdr, HDR_COM))) {
2403                         /* properly end the chain */
2404                         SCVAL(vwv+0, 0, 0xff);
2405                         SCVAL(vwv+0, 1, 0xff);
2406                         SSVAL(vwv+1, 0, 0);
2407                 }
2408
2409                 if (i == 0) {
2410                         /*
2411                          * The NBT and SMB header
2412                          */
2413                         this_iov[0] = state->smb1.iov[0];
2414                         this_iov[1] = state->smb1.iov[1];
2415                         this_iov += 2;
2416                 } else {
2417                         /*
2418                          * This one is a bit subtle. We have to add
2419                          * chain_padding bytes between the requests, and we
2420                          * have to also include the wct field of the
2421                          * subsequent requests. We use the subsequent header
2422                          * for the padding, it contains the wct field in its
2423                          * last byte.
2424                          */
2425                         this_iov[0].iov_len = chain_padding+1;
2426                         this_iov[0].iov_base = (void *)&state->smb1.hdr[
2427                                 sizeof(state->smb1.hdr) - this_iov[0].iov_len];
2428                         memset(this_iov[0].iov_base, 0, this_iov[0].iov_len-1);
2429                         this_iov += 1;
2430                 }
2431
2432                 /*
2433                  * copy the words and bytes
2434                  */
2435                 memcpy(this_iov, state->smb1.iov+2,
2436                        sizeof(struct iovec) * (state->smb1.iov_count-2));
2437                 this_iov += state->smb1.iov_count - 2;
2438                 chain_padding = next_padding;
2439         }
2440
2441         nbt_len = smbXcli_iov_len(&iov[1], iovlen-1);
2442         if (nbt_len > first_state->conn->smb1.max_xmit) {
2443                 TALLOC_FREE(iov);
2444                 TALLOC_FREE(first_state->smb1.chained_requests);
2445                 return NT_STATUS_INVALID_PARAMETER_MIX;
2446         }
2447
2448         status = smb1cli_req_writev_submit(reqs[0], first_state, iov, iovlen);
2449         if (!NT_STATUS_IS_OK(status)) {
2450                 TALLOC_FREE(iov);
2451                 TALLOC_FREE(first_state->smb1.chained_requests);
2452                 return status;
2453         }
2454
2455         return NT_STATUS_OK;
2456 }
2457
2458 bool smbXcli_conn_has_async_calls(struct smbXcli_conn *conn)
2459 {
2460         return ((tevent_queue_length(conn->outgoing) != 0)
2461                 || (talloc_array_length(conn->pending) != 0));
2462 }
2463
2464 bool smbXcli_conn_dfs_supported(struct smbXcli_conn *conn)
2465 {
2466         if (conn->protocol >= PROTOCOL_SMB2_02) {
2467                 return (smb2cli_conn_server_capabilities(conn) & SMB2_CAP_DFS);
2468         }
2469
2470         return (smb1cli_conn_capabilities(conn) & CAP_DFS);
2471 }
2472
2473 bool smb2cli_conn_req_possible(struct smbXcli_conn *conn, uint32_t *max_dyn_len)
2474 {
2475         uint16_t credits = 1;
2476
2477         if (conn->smb2.cur_credits == 0) {
2478                 if (max_dyn_len != NULL) {
2479                         *max_dyn_len = 0;
2480                 }
2481                 return false;
2482         }
2483
2484         if (conn->smb2.server.capabilities & SMB2_CAP_LARGE_MTU) {
2485                 credits = conn->smb2.cur_credits;
2486         }
2487
2488         if (max_dyn_len != NULL) {
2489                 *max_dyn_len = credits * 65536;
2490         }
2491
2492         return true;
2493 }
2494
2495 uint32_t smb2cli_conn_server_capabilities(struct smbXcli_conn *conn)
2496 {
2497         return conn->smb2.server.capabilities;
2498 }
2499
2500 uint16_t smb2cli_conn_server_security_mode(struct smbXcli_conn *conn)
2501 {
2502         return conn->smb2.server.security_mode;
2503 }
2504
2505 uint32_t smb2cli_conn_max_trans_size(struct smbXcli_conn *conn)
2506 {
2507         return conn->smb2.server.max_trans_size;
2508 }
2509
2510 uint32_t smb2cli_conn_max_read_size(struct smbXcli_conn *conn)
2511 {
2512         return conn->smb2.server.max_read_size;
2513 }
2514
2515 uint32_t smb2cli_conn_max_write_size(struct smbXcli_conn *conn)
2516 {
2517         return conn->smb2.server.max_write_size;
2518 }
2519
2520 void smb2cli_conn_set_max_credits(struct smbXcli_conn *conn,
2521                                   uint16_t max_credits)
2522 {
2523         conn->smb2.max_credits = max_credits;
2524 }
2525
2526 static void smb2cli_req_cancel_done(struct tevent_req *subreq);
2527
2528 static bool smb2cli_req_cancel(struct tevent_req *req)
2529 {
2530         struct smbXcli_req_state *state =
2531                 tevent_req_data(req,
2532                 struct smbXcli_req_state);
2533         uint32_t flags = IVAL(state->smb2.hdr, SMB2_HDR_FLAGS);
2534         uint64_t mid = BVAL(state->smb2.hdr, SMB2_HDR_MESSAGE_ID);
2535         uint64_t aid = BVAL(state->smb2.hdr, SMB2_HDR_ASYNC_ID);
2536         struct smbXcli_tcon *tcon = state->tcon;
2537         struct smbXcli_session *session = state->session;
2538         uint8_t *fixed = state->smb2.pad;
2539         uint16_t fixed_len = 4;
2540         struct tevent_req *subreq;
2541         struct smbXcli_req_state *substate;
2542         NTSTATUS status;
2543
2544         SSVAL(fixed, 0, 0x04);
2545         SSVAL(fixed, 2, 0);
2546
2547         subreq = smb2cli_req_create(state, state->ev,
2548                                     state->conn,
2549                                     SMB2_OP_CANCEL,
2550                                     flags, 0,
2551                                     0, /* timeout */
2552                                     tcon, session,
2553                                     fixed, fixed_len,
2554                                     NULL, 0, 0);
2555         if (subreq == NULL) {
2556                 return false;
2557         }
2558         substate = tevent_req_data(subreq, struct smbXcli_req_state);
2559
2560         /*
2561          * clear everything but the SMB2_HDR_FLAG_ASYNC flag
2562          * e.g. if SMB2_HDR_FLAG_CHAINED is set we get INVALID_PARAMETER back
2563          */
2564         flags &= SMB2_HDR_FLAG_ASYNC;
2565
2566         if (flags & SMB2_HDR_FLAG_ASYNC) {
2567                 mid = 0;
2568         }
2569
2570         SIVAL(substate->smb2.hdr, SMB2_HDR_FLAGS, flags);
2571         SBVAL(substate->smb2.hdr, SMB2_HDR_MESSAGE_ID, mid);
2572         SBVAL(substate->smb2.hdr, SMB2_HDR_ASYNC_ID, aid);
2573
2574         status = smb2cli_req_compound_submit(&subreq, 1);
2575         if (!NT_STATUS_IS_OK(status)) {
2576                 TALLOC_FREE(subreq);
2577                 return false;
2578         }
2579
2580         tevent_req_set_callback(subreq, smb2cli_req_cancel_done, NULL);
2581
2582         return true;
2583 }
2584
2585 static void smb2cli_req_cancel_done(struct tevent_req *subreq)
2586 {
2587         /* we do not care about the result */
2588         TALLOC_FREE(subreq);
2589 }
2590
2591 struct tevent_req *smb2cli_req_create(TALLOC_CTX *mem_ctx,
2592                                       struct tevent_context *ev,
2593                                       struct smbXcli_conn *conn,
2594                                       uint16_t cmd,
2595                                       uint32_t additional_flags,
2596                                       uint32_t clear_flags,
2597                                       uint32_t timeout_msec,
2598                                       struct smbXcli_tcon *tcon,
2599                                       struct smbXcli_session *session,
2600                                       const uint8_t *fixed,
2601                                       uint16_t fixed_len,
2602                                       const uint8_t *dyn,
2603                                       uint32_t dyn_len,
2604                                       uint32_t max_dyn_len)
2605 {
2606         struct tevent_req *req;
2607         struct smbXcli_req_state *state;
2608         uint32_t flags = 0;
2609         uint32_t tid = 0;
2610         uint64_t uid = 0;
2611         bool use_channel_sequence = false;
2612         uint16_t channel_sequence = 0;
2613
2614         req = tevent_req_create(mem_ctx, &state,
2615                                 struct smbXcli_req_state);
2616         if (req == NULL) {
2617                 return NULL;
2618         }
2619
2620         state->ev = ev;
2621         state->conn = conn;
2622         state->session = session;
2623         state->tcon = tcon;
2624
2625         if (conn->smb2.server.capabilities & SMB2_CAP_PERSISTENT_HANDLES) {
2626                 use_channel_sequence = true;
2627         } else if (conn->smb2.server.capabilities & SMB2_CAP_MULTI_CHANNEL) {
2628                 use_channel_sequence = true;
2629         }
2630
2631         if (session) {
2632                 uid = session->smb2->session_id;
2633
2634                 if (use_channel_sequence) {
2635                         channel_sequence = session->smb2->channel_sequence;
2636                 }
2637
2638                 state->smb2.should_sign = session->smb2->should_sign;
2639                 state->smb2.should_encrypt = session->smb2->should_encrypt;
2640
2641                 if (cmd == SMB2_OP_SESSSETUP &&
2642                     session->smb2->signing_key.length != 0) {
2643                         state->smb2.should_sign = true;
2644                 }
2645
2646                 if (cmd == SMB2_OP_SESSSETUP &&
2647                     session->smb2_channel.signing_key.length == 0) {
2648                         state->smb2.should_encrypt = false;
2649                 }
2650         }
2651
2652         if (tcon) {
2653                 tid = tcon->smb2.tcon_id;
2654
2655                 if (tcon->smb2.should_encrypt) {
2656                         state->smb2.should_encrypt = true;
2657                 }
2658         }
2659
2660         if (state->smb2.should_encrypt) {
2661                 state->smb2.should_sign = false;
2662         }
2663
2664         state->smb2.recv_iov = talloc_zero_array(state, struct iovec, 3);
2665         if (state->smb2.recv_iov == NULL) {
2666                 TALLOC_FREE(req);
2667                 return NULL;
2668         }
2669
2670         flags |= additional_flags;
2671         flags &= ~clear_flags;
2672
2673         state->smb2.fixed = fixed;
2674         state->smb2.fixed_len = fixed_len;
2675         state->smb2.dyn = dyn;
2676         state->smb2.dyn_len = dyn_len;
2677         state->smb2.max_dyn_len = max_dyn_len;
2678
2679         if (state->smb2.should_encrypt) {
2680                 SIVAL(state->smb2.transform, SMB2_TF_PROTOCOL_ID, SMB2_TF_MAGIC);
2681                 SBVAL(state->smb2.transform, SMB2_TF_SESSION_ID, uid);
2682         }
2683
2684         SIVAL(state->smb2.hdr, SMB2_HDR_PROTOCOL_ID,    SMB2_MAGIC);
2685         SSVAL(state->smb2.hdr, SMB2_HDR_LENGTH,         SMB2_HDR_BODY);
2686         SSVAL(state->smb2.hdr, SMB2_HDR_OPCODE,         cmd);
2687         SSVAL(state->smb2.hdr, SMB2_HDR_CHANNEL_SEQUENCE, channel_sequence);
2688         SIVAL(state->smb2.hdr, SMB2_HDR_FLAGS,          flags);
2689         SIVAL(state->smb2.hdr, SMB2_HDR_PID,            0); /* reserved */
2690         SIVAL(state->smb2.hdr, SMB2_HDR_TID,            tid);
2691         SBVAL(state->smb2.hdr, SMB2_HDR_SESSION_ID,     uid);
2692
2693         switch (cmd) {
2694         case SMB2_OP_CANCEL:
2695                 state->one_way = true;
2696                 break;
2697         case SMB2_OP_BREAK:
2698                 /*
2699                  * If this is a dummy request, it will have
2700                  * UINT64_MAX as message id.
2701                  * If we send on break acknowledgement,
2702                  * this gets overwritten later.
2703                  */
2704                 SBVAL(state->smb2.hdr, SMB2_HDR_MESSAGE_ID, UINT64_MAX);
2705                 break;
2706         }
2707
2708         if (timeout_msec > 0) {
2709                 struct timeval endtime;
2710
2711                 endtime = timeval_current_ofs_msec(timeout_msec);
2712                 if (!tevent_req_set_endtime(req, ev, endtime)) {
2713                         return req;
2714                 }
2715         }
2716
2717         return req;
2718 }
2719
2720 void smb2cli_req_set_notify_async(struct tevent_req *req)
2721 {
2722         struct smbXcli_req_state *state =
2723                 tevent_req_data(req,
2724                 struct smbXcli_req_state);
2725
2726         state->smb2.notify_async = true;
2727 }
2728
2729 static void smb2cli_req_writev_done(struct tevent_req *subreq);
2730 static NTSTATUS smb2cli_conn_dispatch_incoming(struct smbXcli_conn *conn,
2731                                                TALLOC_CTX *tmp_mem,
2732                                                uint8_t *inbuf);
2733
2734 NTSTATUS smb2cli_req_compound_submit(struct tevent_req **reqs,
2735                                      int num_reqs)
2736 {
2737         struct smbXcli_req_state *state;
2738         struct tevent_req *subreq;
2739         struct iovec *iov;
2740         int i, num_iov, nbt_len;
2741         int tf_iov = -1;
2742         const DATA_BLOB *encryption_key = NULL;
2743         uint64_t encryption_session_id = 0;
2744
2745         /*
2746          * 1 for the nbt length, optional TRANSFORM
2747          * per request: HDR, fixed, dyn, padding
2748          * -1 because the last one does not need padding
2749          */
2750
2751         iov = talloc_array(reqs[0], struct iovec, 1 + 1 + 4*num_reqs - 1);
2752         if (iov == NULL) {
2753                 return NT_STATUS_NO_MEMORY;
2754         }
2755
2756         num_iov = 1;
2757         nbt_len = 0;
2758
2759         /*
2760          * the session of the first request that requires encryption
2761          * specifies the encryption key.
2762          */
2763         for (i=0; i<num_reqs; i++) {
2764                 if (!tevent_req_is_in_progress(reqs[i])) {
2765                         return NT_STATUS_INTERNAL_ERROR;
2766                 }
2767
2768                 state = tevent_req_data(reqs[i], struct smbXcli_req_state);
2769
2770                 if (!smbXcli_conn_is_connected(state->conn)) {
2771                         return NT_STATUS_CONNECTION_DISCONNECTED;
2772                 }
2773
2774                 if ((state->conn->protocol != PROTOCOL_NONE) &&
2775                     (state->conn->protocol < PROTOCOL_SMB2_02)) {
2776                         return NT_STATUS_REVISION_MISMATCH;
2777                 }
2778
2779                 if (state->session == NULL) {
2780                         continue;
2781                 }
2782
2783                 if (!state->smb2.should_encrypt) {
2784                         continue;
2785                 }
2786
2787                 encryption_key = &state->session->smb2->encryption_key;
2788                 if (encryption_key->length == 0) {
2789                         return NT_STATUS_INVALID_PARAMETER_MIX;
2790                 }
2791
2792                 encryption_session_id = state->session->smb2->session_id;
2793
2794                 tf_iov = num_iov;
2795                 iov[num_iov].iov_base = state->smb2.transform;
2796                 iov[num_iov].iov_len  = sizeof(state->smb2.transform);
2797                 num_iov += 1;
2798
2799                 SBVAL(state->smb2.transform, SMB2_TF_PROTOCOL_ID, SMB2_TF_MAGIC);
2800                 SBVAL(state->smb2.transform, SMB2_TF_NONCE,
2801                       state->session->smb2->nonce_low);
2802                 SBVAL(state->smb2.transform, SMB2_TF_NONCE+8,
2803                       state->session->smb2->nonce_high);
2804                 SBVAL(state->smb2.transform, SMB2_TF_SESSION_ID,
2805                       encryption_session_id);
2806
2807                 state->session->smb2->nonce_low += 1;
2808                 if (state->session->smb2->nonce_low == 0) {
2809                         state->session->smb2->nonce_high += 1;
2810                         state->session->smb2->nonce_low += 1;
2811                 }
2812
2813                 nbt_len += SMB2_TF_HDR_SIZE;
2814                 break;
2815         }
2816
2817         for (i=0; i<num_reqs; i++) {
2818                 int hdr_iov;
2819                 size_t reqlen;
2820                 bool ret;
2821                 uint16_t opcode;
2822                 uint64_t avail;
2823                 uint16_t charge;
2824                 uint16_t credits;
2825                 uint64_t mid;
2826                 const DATA_BLOB *signing_key = NULL;
2827
2828                 if (!tevent_req_is_in_progress(reqs[i])) {
2829                         return NT_STATUS_INTERNAL_ERROR;
2830                 }
2831
2832                 state = tevent_req_data(reqs[i], struct smbXcli_req_state);
2833
2834                 if (!smbXcli_conn_is_connected(state->conn)) {
2835                         return NT_STATUS_CONNECTION_DISCONNECTED;
2836                 }
2837
2838                 if ((state->conn->protocol != PROTOCOL_NONE) &&
2839                     (state->conn->protocol < PROTOCOL_SMB2_02)) {
2840                         return NT_STATUS_REVISION_MISMATCH;
2841                 }
2842
2843                 opcode = SVAL(state->smb2.hdr, SMB2_HDR_OPCODE);
2844                 if (opcode == SMB2_OP_CANCEL) {
2845                         goto skip_credits;
2846                 }
2847
2848                 avail = UINT64_MAX - state->conn->smb2.mid;
2849                 if (avail < 1) {
2850                         return NT_STATUS_CONNECTION_ABORTED;
2851                 }
2852
2853                 if (state->conn->smb2.server.capabilities & SMB2_CAP_LARGE_MTU) {
2854                         uint32_t max_dyn_len = 1;
2855
2856                         max_dyn_len = MAX(max_dyn_len, state->smb2.dyn_len);
2857                         max_dyn_len = MAX(max_dyn_len, state->smb2.max_dyn_len);
2858
2859                         charge = (max_dyn_len - 1)/ 65536 + 1;
2860                 } else {
2861                         charge = 1;
2862                 }
2863
2864                 charge = MAX(state->smb2.credit_charge, charge);
2865
2866                 avail = MIN(avail, state->conn->smb2.cur_credits);
2867                 if (avail < charge) {
2868                         return NT_STATUS_INTERNAL_ERROR;
2869                 }
2870
2871                 credits = 0;
2872                 if (state->conn->smb2.max_credits > state->conn->smb2.cur_credits) {
2873                         credits = state->conn->smb2.max_credits -
2874                                   state->conn->smb2.cur_credits;
2875                 }
2876                 if (state->conn->smb2.max_credits >= state->conn->smb2.cur_credits) {
2877                         credits += 1;
2878                 }
2879
2880                 mid = state->conn->smb2.mid;
2881                 state->conn->smb2.mid += charge;
2882                 state->conn->smb2.cur_credits -= charge;
2883
2884                 if (state->conn->smb2.server.capabilities & SMB2_CAP_LARGE_MTU) {
2885                         SSVAL(state->smb2.hdr, SMB2_HDR_CREDIT_CHARGE, charge);
2886                 }
2887                 SSVAL(state->smb2.hdr, SMB2_HDR_CREDIT, credits);
2888                 SBVAL(state->smb2.hdr, SMB2_HDR_MESSAGE_ID, mid);
2889
2890 skip_credits:
2891                 if (state->session && encryption_key == NULL) {
2892                         /*
2893                          * We prefer the channel signing key if it is
2894                          * already there.
2895                          */
2896                         if (state->smb2.should_sign) {
2897                                 signing_key = &state->session->smb2_channel.signing_key;
2898                         }
2899
2900                         /*
2901                          * If it is a channel binding, we already have the main
2902                          * signing key and try that one.
2903                          */
2904                         if (signing_key && signing_key->length == 0) {
2905                                 signing_key = &state->session->smb2->signing_key;
2906                         }
2907
2908                         /*
2909                          * If we do not have any session key yet, we skip the
2910                          * signing of SMB2_OP_SESSSETUP requests.
2911                          */
2912                         if (signing_key && signing_key->length == 0) {
2913                                 signing_key = NULL;
2914                         }
2915                 }
2916
2917                 hdr_iov = num_iov;
2918                 iov[num_iov].iov_base = state->smb2.hdr;
2919                 iov[num_iov].iov_len  = sizeof(state->smb2.hdr);
2920                 num_iov += 1;
2921
2922                 iov[num_iov].iov_base = discard_const(state->smb2.fixed);
2923                 iov[num_iov].iov_len  = state->smb2.fixed_len;
2924                 num_iov += 1;
2925
2926                 if (state->smb2.dyn != NULL) {
2927                         iov[num_iov].iov_base = discard_const(state->smb2.dyn);
2928                         iov[num_iov].iov_len  = state->smb2.dyn_len;
2929                         num_iov += 1;
2930                 }
2931
2932                 reqlen  = sizeof(state->smb2.hdr);
2933                 reqlen += state->smb2.fixed_len;
2934                 reqlen += state->smb2.dyn_len;
2935
2936                 if (i < num_reqs-1) {
2937                         if ((reqlen % 8) > 0) {
2938                                 uint8_t pad = 8 - (reqlen % 8);
2939                                 iov[num_iov].iov_base = state->smb2.pad;
2940                                 iov[num_iov].iov_len = pad;
2941                                 num_iov += 1;
2942                                 reqlen += pad;
2943                         }
2944                         SIVAL(state->smb2.hdr, SMB2_HDR_NEXT_COMMAND, reqlen);
2945                 }
2946
2947                 state->smb2.encryption_session_id = encryption_session_id;
2948
2949                 if (signing_key != NULL) {
2950                         NTSTATUS status;
2951
2952                         status = smb2_signing_sign_pdu(*signing_key,
2953                                                        state->session->conn->protocol,
2954                                                        &iov[hdr_iov], num_iov - hdr_iov);
2955                         if (!NT_STATUS_IS_OK(status)) {
2956                                 return status;
2957                         }
2958                 }
2959
2960                 nbt_len += reqlen;
2961
2962                 ret = smbXcli_req_set_pending(reqs[i]);
2963                 if (!ret) {
2964                         return NT_STATUS_NO_MEMORY;
2965                 }
2966         }
2967
2968         state = tevent_req_data(reqs[0], struct smbXcli_req_state);
2969         _smb_setlen_tcp(state->length_hdr, nbt_len);
2970         iov[0].iov_base = state->length_hdr;
2971         iov[0].iov_len  = sizeof(state->length_hdr);
2972
2973         if (encryption_key != NULL) {
2974                 NTSTATUS status;
2975                 size_t buflen = nbt_len - SMB2_TF_HDR_SIZE;
2976                 uint8_t *buf;
2977                 int vi;
2978
2979                 buf = talloc_array(iov, uint8_t, buflen);
2980                 if (buf == NULL) {
2981                         return NT_STATUS_NO_MEMORY;
2982                 }
2983
2984                 /*
2985                  * We copy the buffers before encrypting them,
2986                  * this is at least currently needed for the
2987                  * to keep state->smb2.hdr.
2988                  *
2989                  * Also the callers may expect there buffers
2990                  * to be const.
2991                  */
2992                 for (vi = tf_iov + 1; vi < num_iov; vi++) {
2993                         struct iovec *v = &iov[vi];
2994                         const uint8_t *o = (const uint8_t *)v->iov_base;
2995
2996                         memcpy(buf, o, v->iov_len);
2997                         v->iov_base = (void *)buf;
2998                         buf += v->iov_len;
2999                 }
3000
3001                 status = smb2_signing_encrypt_pdu(*encryption_key,
3002                                         state->conn->protocol,
3003                                         &iov[tf_iov], num_iov - tf_iov);
3004                 if (!NT_STATUS_IS_OK(status)) {
3005                         return status;
3006                 }
3007         }
3008
3009         if (state->conn->dispatch_incoming == NULL) {
3010                 state->conn->dispatch_incoming = smb2cli_conn_dispatch_incoming;
3011         }
3012
3013         subreq = writev_send(state, state->ev, state->conn->outgoing,
3014                              state->conn->write_fd, false, iov, num_iov);
3015         if (subreq == NULL) {
3016                 return NT_STATUS_NO_MEMORY;
3017         }
3018         tevent_req_set_callback(subreq, smb2cli_req_writev_done, reqs[0]);
3019         return NT_STATUS_OK;
3020 }
3021
3022 void smb2cli_req_set_credit_charge(struct tevent_req *req, uint16_t charge)
3023 {
3024         struct smbXcli_req_state *state =
3025                 tevent_req_data(req,
3026                 struct smbXcli_req_state);
3027
3028         state->smb2.credit_charge = charge;
3029 }
3030
3031 struct tevent_req *smb2cli_req_send(TALLOC_CTX *mem_ctx,
3032                                     struct tevent_context *ev,
3033                                     struct smbXcli_conn *conn,
3034                                     uint16_t cmd,
3035                                     uint32_t additional_flags,
3036                                     uint32_t clear_flags,
3037                                     uint32_t timeout_msec,
3038                                     struct smbXcli_tcon *tcon,
3039                                     struct smbXcli_session *session,
3040                                     const uint8_t *fixed,
3041                                     uint16_t fixed_len,
3042                                     const uint8_t *dyn,
3043                                     uint32_t dyn_len,
3044                                     uint32_t max_dyn_len)
3045 {
3046         struct tevent_req *req;
3047         NTSTATUS status;
3048
3049         req = smb2cli_req_create(mem_ctx, ev, conn, cmd,
3050                                  additional_flags, clear_flags,
3051                                  timeout_msec,
3052                                  tcon, session,
3053                                  fixed, fixed_len,
3054                                  dyn, dyn_len,
3055                                  max_dyn_len);
3056         if (req == NULL) {
3057                 return NULL;
3058         }
3059         if (!tevent_req_is_in_progress(req)) {
3060                 return tevent_req_post(req, ev);
3061         }
3062         status = smb2cli_req_compound_submit(&req, 1);
3063         if (tevent_req_nterror(req, status)) {
3064                 return tevent_req_post(req, ev);
3065         }
3066         return req;
3067 }
3068
3069 static void smb2cli_req_writev_done(struct tevent_req *subreq)
3070 {
3071         struct tevent_req *req =
3072                 tevent_req_callback_data(subreq,
3073                 struct tevent_req);
3074         struct smbXcli_req_state *state =
3075                 tevent_req_data(req,
3076                 struct smbXcli_req_state);
3077         ssize_t nwritten;
3078         int err;
3079
3080         nwritten = writev_recv(subreq, &err);
3081         TALLOC_FREE(subreq);
3082         if (nwritten == -1) {
3083                 /* here, we need to notify all pending requests */
3084                 NTSTATUS status = map_nt_error_from_unix_common(err);
3085                 smbXcli_conn_disconnect(state->conn, status);
3086                 return;
3087         }
3088 }
3089
3090 static NTSTATUS smb2cli_inbuf_parse_compound(struct smbXcli_conn *conn,
3091                                              uint8_t *buf,
3092                                              size_t buflen,
3093                                              TALLOC_CTX *mem_ctx,
3094                                              struct iovec **piov, int *pnum_iov)
3095 {
3096         struct iovec *iov;
3097         int num_iov = 0;
3098         size_t taken = 0;
3099         uint8_t *first_hdr = buf;
3100         size_t verified_buflen = 0;
3101         uint8_t *tf = NULL;
3102         size_t tf_len = 0;
3103
3104         iov = talloc_array(mem_ctx, struct iovec, num_iov);
3105         if (iov == NULL) {
3106                 return NT_STATUS_NO_MEMORY;
3107         }
3108
3109         while (taken < buflen) {
3110                 size_t len = buflen - taken;
3111                 uint8_t *hdr = first_hdr + taken;
3112                 struct iovec *cur;
3113                 size_t full_size;
3114                 size_t next_command_ofs;
3115                 uint16_t body_size;
3116                 struct iovec *iov_tmp;
3117
3118                 if (verified_buflen > taken) {
3119                         len = verified_buflen - taken;
3120                 } else {
3121                         tf = NULL;
3122                         tf_len = 0;
3123                 }
3124
3125                 if (len < 4) {
3126                         DEBUG(10, ("%d bytes left, expected at least %d\n",
3127                                    (int)len, 4));
3128                         goto inval;
3129                 }
3130                 if (IVAL(hdr, 0) == SMB2_TF_MAGIC) {
3131                         struct smbXcli_session *s;
3132                         uint64_t uid;
3133                         struct iovec tf_iov[2];
3134                         size_t enc_len;
3135                         NTSTATUS status;
3136
3137                         if (len < SMB2_TF_HDR_SIZE) {
3138                                 DEBUG(10, ("%d bytes left, expected at least %d\n",
3139                                            (int)len, SMB2_TF_HDR_SIZE));
3140                                 goto inval;
3141                         }
3142                         tf = hdr;
3143                         tf_len = SMB2_TF_HDR_SIZE;
3144                         taken += tf_len;
3145
3146                         hdr = first_hdr + taken;
3147                         enc_len = IVAL(tf, SMB2_TF_MSG_SIZE);
3148                         uid = BVAL(tf, SMB2_TF_SESSION_ID);
3149
3150                         if (len < SMB2_TF_HDR_SIZE + enc_len) {
3151                                 DEBUG(10, ("%d bytes left, expected at least %d\n",
3152                                            (int)len,
3153                                            (int)(SMB2_TF_HDR_SIZE + enc_len)));
3154                                 goto inval;
3155                         }
3156
3157                         s = conn->sessions;
3158                         for (; s; s = s->next) {
3159                                 if (s->smb2->session_id != uid) {
3160                                         continue;
3161                                 }
3162                                 break;
3163                         }
3164
3165                         if (s == NULL) {
3166                                 DEBUG(10, ("unknown session_id %llu\n",
3167                                            (unsigned long long)uid));
3168                                 goto inval;
3169                         }
3170
3171                         tf_iov[0].iov_base = (void *)tf;
3172                         tf_iov[0].iov_len = tf_len;
3173                         tf_iov[1].iov_base = (void *)hdr;
3174                         tf_iov[1].iov_len = enc_len;
3175
3176                         status = smb2_signing_decrypt_pdu(s->smb2->decryption_key,
3177                                                           conn->protocol,
3178                                                           tf_iov, 2);
3179                         if (!NT_STATUS_IS_OK(status)) {
3180                                 TALLOC_FREE(iov);
3181                                 return status;
3182                         }
3183
3184                         verified_buflen = taken + enc_len;
3185                         len = enc_len;
3186                 }
3187
3188                 /*
3189                  * We need the header plus the body length field
3190                  */
3191
3192                 if (len < SMB2_HDR_BODY + 2) {
3193                         DEBUG(10, ("%d bytes left, expected at least %d\n",
3194                                    (int)len, SMB2_HDR_BODY));
3195                         goto inval;
3196                 }
3197                 if (IVAL(hdr, 0) != SMB2_MAGIC) {
3198                         DEBUG(10, ("Got non-SMB2 PDU: %x\n",
3199                                    IVAL(hdr, 0)));
3200                         goto inval;
3201                 }
3202                 if (SVAL(hdr, 4) != SMB2_HDR_BODY) {
3203                         DEBUG(10, ("Got HDR len %d, expected %d\n",
3204                                    SVAL(hdr, 4), SMB2_HDR_BODY));
3205                         goto inval;
3206                 }
3207
3208                 full_size = len;
3209                 next_command_ofs = IVAL(hdr, SMB2_HDR_NEXT_COMMAND);
3210                 body_size = SVAL(hdr, SMB2_HDR_BODY);
3211
3212                 if (next_command_ofs != 0) {
3213                         if (next_command_ofs < (SMB2_HDR_BODY + 2)) {
3214                                 goto inval;
3215                         }
3216                         if (next_command_ofs > full_size) {
3217                                 goto inval;
3218                         }
3219                         full_size = next_command_ofs;
3220                 }
3221                 if (body_size < 2) {
3222                         goto inval;
3223                 }
3224                 body_size &= 0xfffe;
3225
3226                 if (body_size > (full_size - SMB2_HDR_BODY)) {
3227                         goto inval;
3228                 }
3229
3230                 iov_tmp = talloc_realloc(mem_ctx, iov, struct iovec,
3231                                          num_iov + 4);
3232                 if (iov_tmp == NULL) {
3233                         TALLOC_FREE(iov);
3234                         return NT_STATUS_NO_MEMORY;
3235                 }
3236                 iov = iov_tmp;
3237                 cur = &iov[num_iov];
3238                 num_iov += 4;
3239
3240                 cur[0].iov_base = tf;
3241                 cur[0].iov_len  = tf_len;
3242                 cur[1].iov_base = hdr;
3243                 cur[1].iov_len  = SMB2_HDR_BODY;
3244                 cur[2].iov_base = hdr + SMB2_HDR_BODY;
3245                 cur[2].iov_len  = body_size;
3246                 cur[3].iov_base = hdr + SMB2_HDR_BODY + body_size;
3247                 cur[3].iov_len  = full_size - (SMB2_HDR_BODY + body_size);
3248
3249                 taken += full_size;
3250         }
3251
3252         *piov = iov;
3253         *pnum_iov = num_iov;
3254         return NT_STATUS_OK;
3255
3256 inval:
3257         TALLOC_FREE(iov);
3258         return NT_STATUS_INVALID_NETWORK_RESPONSE;
3259 }
3260
3261 static struct tevent_req *smb2cli_conn_find_pending(struct smbXcli_conn *conn,
3262                                                     uint64_t mid)
3263 {
3264         size_t num_pending = talloc_array_length(conn->pending);
3265         size_t i;
3266
3267         for (i=0; i<num_pending; i++) {
3268                 struct tevent_req *req = conn->pending[i];
3269                 struct smbXcli_req_state *state =
3270                         tevent_req_data(req,
3271                         struct smbXcli_req_state);
3272
3273                 if (mid == BVAL(state->smb2.hdr, SMB2_HDR_MESSAGE_ID)) {
3274                         return req;
3275                 }
3276         }
3277         return NULL;
3278 }
3279
3280 static NTSTATUS smb2cli_conn_dispatch_incoming(struct smbXcli_conn *conn,
3281                                                TALLOC_CTX *tmp_mem,
3282                                                uint8_t *inbuf)
3283 {
3284         struct tevent_req *req;
3285         struct smbXcli_req_state *state = NULL;
3286         struct iovec *iov;
3287         int i, num_iov;
3288         NTSTATUS status;
3289         bool defer = true;
3290         struct smbXcli_session *last_session = NULL;
3291         size_t inbuf_len = smb_len_tcp(inbuf);
3292
3293         status = smb2cli_inbuf_parse_compound(conn,
3294                                               inbuf + NBT_HDR_SIZE,
3295                                               inbuf_len,
3296                                               tmp_mem,
3297                                               &iov, &num_iov);
3298         if (!NT_STATUS_IS_OK(status)) {
3299                 return status;
3300         }
3301
3302         for (i=0; i<num_iov; i+=4) {
3303                 uint8_t *inbuf_ref = NULL;
3304                 struct iovec *cur = &iov[i];
3305                 uint8_t *inhdr = (uint8_t *)cur[1].iov_base;
3306                 uint16_t opcode = SVAL(inhdr, SMB2_HDR_OPCODE);
3307                 uint32_t flags = IVAL(inhdr, SMB2_HDR_FLAGS);
3308                 uint64_t mid = BVAL(inhdr, SMB2_HDR_MESSAGE_ID);
3309                 uint16_t req_opcode;
3310                 uint32_t req_flags;
3311                 uint16_t credits = SVAL(inhdr, SMB2_HDR_CREDIT);
3312                 uint32_t new_credits;
3313                 struct smbXcli_session *session = NULL;
3314                 const DATA_BLOB *signing_key = NULL;
3315                 bool was_encrypted = false;
3316
3317                 new_credits = conn->smb2.cur_credits;
3318                 new_credits += credits;
3319                 if (new_credits > UINT16_MAX) {
3320                         return NT_STATUS_INVALID_NETWORK_RESPONSE;
3321                 }
3322                 conn->smb2.cur_credits += credits;
3323
3324                 req = smb2cli_conn_find_pending(conn, mid);
3325                 if (req == NULL) {
3326                         return NT_STATUS_INVALID_NETWORK_RESPONSE;
3327                 }
3328                 state = tevent_req_data(req, struct smbXcli_req_state);
3329
3330                 state->smb2.got_async = false;
3331
3332                 req_opcode = SVAL(state->smb2.hdr, SMB2_HDR_OPCODE);
3333                 if (opcode != req_opcode) {
3334                         return NT_STATUS_INVALID_NETWORK_RESPONSE;
3335                 }
3336                 req_flags = SVAL(state->smb2.hdr, SMB2_HDR_FLAGS);
3337
3338                 if (!(flags & SMB2_HDR_FLAG_REDIRECT)) {
3339                         return NT_STATUS_INVALID_NETWORK_RESPONSE;
3340                 }
3341
3342                 status = NT_STATUS(IVAL(inhdr, SMB2_HDR_STATUS));
3343                 if ((flags & SMB2_HDR_FLAG_ASYNC) &&
3344                     NT_STATUS_EQUAL(status, STATUS_PENDING)) {
3345                         uint64_t async_id = BVAL(inhdr, SMB2_HDR_ASYNC_ID);
3346
3347                         /*
3348                          * async interim responses are not signed,
3349                          * even if the SMB2_HDR_FLAG_SIGNED flag
3350                          * is set.
3351                          */
3352                         req_flags |= SMB2_HDR_FLAG_ASYNC;
3353                         SBVAL(state->smb2.hdr, SMB2_HDR_FLAGS, req_flags);
3354                         SBVAL(state->smb2.hdr, SMB2_HDR_ASYNC_ID, async_id);
3355
3356                         if (state->smb2.notify_async) {
3357                                 state->smb2.got_async = true;
3358                                 tevent_req_defer_callback(req, state->ev);
3359                                 tevent_req_notify_callback(req);
3360                         }
3361                         continue;
3362                 }
3363
3364                 session = state->session;
3365                 if (req_flags & SMB2_HDR_FLAG_CHAINED) {
3366                         session = last_session;
3367                 }
3368                 last_session = session;
3369
3370                 if (state->smb2.should_sign) {
3371                         if (!(flags & SMB2_HDR_FLAG_SIGNED)) {
3372                                 return NT_STATUS_ACCESS_DENIED;
3373                         }
3374                 }
3375
3376                 if (flags & SMB2_HDR_FLAG_SIGNED) {
3377                         uint64_t uid = BVAL(inhdr, SMB2_HDR_SESSION_ID);
3378
3379                         if (session == NULL) {
3380                                 struct smbXcli_session *s;
3381
3382                                 s = state->conn->sessions;
3383                                 for (; s; s = s->next) {
3384                                         if (s->smb2->session_id != uid) {
3385                                                 continue;
3386                                         }
3387
3388                                         session = s;
3389                                         break;
3390                                 }
3391                         }
3392
3393                         if (session == NULL) {
3394                                 return NT_STATUS_INVALID_NETWORK_RESPONSE;
3395                         }
3396
3397                         last_session = session;
3398                         signing_key = &session->smb2_channel.signing_key;
3399                 }
3400
3401                 if (opcode == SMB2_OP_SESSSETUP) {
3402                         /*
3403                          * We prefer the channel signing key, if it is
3404                          * already there.
3405                          *
3406                          * If we do not have a channel signing key yet,
3407                          * we try the main signing key, if it is not
3408                          * the final response.
3409                          */
3410                         if (signing_key && signing_key->length == 0 &&
3411                             !NT_STATUS_IS_OK(status)) {
3412                                 signing_key = &session->smb2->signing_key;
3413                         }
3414
3415                         if (signing_key && signing_key->length == 0) {
3416                                 /*
3417                                  * If we do not have a session key to
3418                                  * verify the signature, we defer the
3419                                  * signing check to the caller.
3420                                  *
3421                                  * The caller gets NT_STATUS_OK, it
3422                                  * has to call
3423                                  * smb2cli_session_set_session_key()
3424                                  * or
3425                                  * smb2cli_session_set_channel_key()
3426                                  * which will check the signature
3427                                  * with the channel signing key.
3428                                  */
3429                                 signing_key = NULL;
3430                         }
3431                 }
3432
3433                 if (cur[0].iov_len == SMB2_TF_HDR_SIZE) {
3434                         const uint8_t *tf = (const uint8_t *)cur[0].iov_base;
3435                         uint64_t uid = BVAL(tf, SMB2_TF_SESSION_ID);
3436
3437                         /*
3438                          * If the response was encrypted in a SMB2_TRANSFORM
3439                          * pdu, which belongs to the correct session,
3440                          * we do not need to do signing checks
3441                          *
3442                          * It could be the session the response belongs to
3443                          * or the session that was used to encrypt the
3444                          * SMB2_TRANSFORM request.
3445                          */
3446                         if ((session && session->smb2->session_id == uid) ||
3447                             (state->smb2.encryption_session_id == uid)) {
3448                                 signing_key = NULL;
3449                                 was_encrypted = true;
3450                         }
3451                 }
3452
3453                 if (NT_STATUS_EQUAL(status, NT_STATUS_USER_SESSION_DELETED)) {
3454                         /*
3455                          * if the server returns NT_STATUS_USER_SESSION_DELETED
3456                          * the response is not signed and we should
3457                          * propagate the NT_STATUS_USER_SESSION_DELETED
3458                          * status to the caller.
3459                          */
3460                         state->smb2.signing_skipped = true;
3461                         signing_key = NULL;
3462                 }
3463
3464                 if (NT_STATUS_EQUAL(status, NT_STATUS_INVALID_PARAMETER)) {
3465                         /*
3466                          * if the server returns
3467                          * NT_STATUS_INVALID_PARAMETER
3468                          * the response might not be encrypted.
3469                          */
3470                         if (state->smb2.should_encrypt && !was_encrypted) {
3471                                 state->smb2.signing_skipped = true;
3472                                 signing_key = NULL;
3473                         }
3474                 }
3475
3476                 if (state->smb2.should_encrypt && !was_encrypted) {
3477                         if (!state->smb2.signing_skipped) {
3478                                 return NT_STATUS_ACCESS_DENIED;
3479                         }
3480                 }
3481
3482                 if (NT_STATUS_EQUAL(status, NT_STATUS_NETWORK_NAME_DELETED) ||
3483                     NT_STATUS_EQUAL(status, NT_STATUS_FILE_CLOSED) ||
3484                     NT_STATUS_EQUAL(status, NT_STATUS_INVALID_PARAMETER)) {
3485                         /*
3486                          * if the server returns
3487                          * NT_STATUS_NETWORK_NAME_DELETED
3488                          * NT_STATUS_FILE_CLOSED
3489                          * NT_STATUS_INVALID_PARAMETER
3490                          * the response might not be signed
3491                          * as this happens before the signing checks.
3492                          *
3493                          * If server echos the signature (or all zeros)
3494                          * we should report the status from the server
3495                          * to the caller.
3496                          */
3497                         if (signing_key) {
3498                                 int cmp;
3499
3500                                 cmp = memcmp(inhdr+SMB2_HDR_SIGNATURE,
3501                                              state->smb2.hdr+SMB2_HDR_SIGNATURE,
3502                                              16);
3503                                 if (cmp == 0) {
3504                                         state->smb2.signing_skipped = true;
3505                                         signing_key = NULL;
3506                                 }
3507                         }
3508                         if (signing_key) {
3509                                 int cmp;
3510                                 static const uint8_t zeros[16];
3511
3512                                 cmp = memcmp(inhdr+SMB2_HDR_SIGNATURE,
3513                                              zeros,
3514                                              16);
3515                                 if (cmp == 0) {
3516                                         state->smb2.signing_skipped = true;
3517                                         signing_key = NULL;
3518                                 }
3519                         }
3520                 }
3521
3522                 if (signing_key) {
3523                         status = smb2_signing_check_pdu(*signing_key,
3524                                                         state->conn->protocol,
3525                                                         &cur[1], 3);
3526                         if (!NT_STATUS_IS_OK(status)) {
3527                                 /*
3528                                  * If the signing check fails, we disconnect
3529                                  * the connection.
3530                                  */
3531                                 return status;
3532                         }
3533                 }
3534
3535                 if (NT_STATUS_EQUAL(status, NT_STATUS_NETWORK_SESSION_EXPIRED) &&
3536                     (session != NULL) && session->disconnect_expired)
3537                 {
3538                         /*
3539                          * this should be a short term hack
3540                          * until the upper layers have implemented
3541                          * re-authentication.
3542                          */
3543                         return status;
3544                 }
3545
3546                 smbXcli_req_unset_pending(req);
3547
3548                 /*
3549                  * There might be more than one response
3550                  * we need to defer the notifications
3551                  */
3552                 if ((num_iov == 5) && (talloc_array_length(conn->pending) == 0)) {
3553                         defer = false;
3554                 }
3555
3556                 if (defer) {
3557                         tevent_req_defer_callback(req, state->ev);
3558                 }
3559
3560                 /*
3561                  * Note: here we use talloc_reference() in a way
3562                  *       that does not expose it to the caller.
3563                  */
3564                 inbuf_ref = talloc_reference(state->smb2.recv_iov, inbuf);
3565                 if (tevent_req_nomem(inbuf_ref, req)) {
3566                         continue;
3567                 }
3568
3569                 /* copy the related buffers */
3570                 state->smb2.recv_iov[0] = cur[1];
3571                 state->smb2.recv_iov[1] = cur[2];
3572                 state->smb2.recv_iov[2] = cur[3];
3573
3574                 tevent_req_done(req);
3575         }
3576
3577         if (defer) {
3578                 return NT_STATUS_RETRY;
3579         }
3580
3581         return NT_STATUS_OK;
3582 }
3583
3584 NTSTATUS smb2cli_req_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
3585                           struct iovec **piov,
3586                           const struct smb2cli_req_expected_response *expected,
3587                           size_t num_expected)
3588 {
3589         struct smbXcli_req_state *state =
3590                 tevent_req_data(req,
3591                 struct smbXcli_req_state);
3592         NTSTATUS status;
3593         size_t body_size;
3594         bool found_status = false;
3595         bool found_size = false;
3596         size_t i;
3597
3598         if (piov != NULL) {
3599                 *piov = NULL;
3600         }
3601
3602         if (state->smb2.got_async) {
3603                 return STATUS_PENDING;
3604         }
3605
3606         if (tevent_req_is_nterror(req, &status)) {
3607                 for (i=0; i < num_expected; i++) {
3608                         if (NT_STATUS_EQUAL(status, expected[i].status)) {
3609                                 found_status = true;
3610                                 break;
3611                         }
3612                 }
3613
3614                 if (found_status) {
3615                         return NT_STATUS_UNEXPECTED_NETWORK_ERROR;
3616                 }
3617
3618                 return status;
3619         }
3620
3621         if (num_expected == 0) {
3622                 found_status = true;
3623                 found_size = true;
3624         }
3625
3626         status = NT_STATUS(IVAL(state->smb2.recv_iov[0].iov_base, SMB2_HDR_STATUS));
3627         body_size = SVAL(state->smb2.recv_iov[1].iov_base, 0);
3628
3629         for (i=0; i < num_expected; i++) {
3630                 if (!NT_STATUS_EQUAL(status, expected[i].status)) {
3631                         continue;
3632                 }
3633
3634                 found_status = true;
3635                 if (expected[i].body_size == 0) {
3636                         found_size = true;
3637                         break;
3638                 }
3639
3640                 if (expected[i].body_size == body_size) {
3641                         found_size = true;
3642                         break;
3643                 }
3644         }
3645
3646         if (!found_status) {
3647                 return status;
3648         }
3649
3650         if (state->smb2.signing_skipped) {
3651                 if (num_expected > 0) {
3652                         return NT_STATUS_ACCESS_DENIED;
3653                 }
3654                 if (!NT_STATUS_IS_ERR(status)) {
3655                         return NT_STATUS_ACCESS_DENIED;
3656                 }
3657         }
3658
3659         if (!found_size) {
3660                 return NT_STATUS_INVALID_NETWORK_RESPONSE;
3661         }
3662
3663         if (piov != NULL) {
3664                 *piov = talloc_move(mem_ctx, &state->smb2.recv_iov);
3665         }
3666
3667         return status;
3668 }
3669
3670 static const struct {
3671         enum protocol_types proto;
3672         const char *smb1_name;
3673 } smb1cli_prots[] = {
3674         {PROTOCOL_CORE,         "PC NETWORK PROGRAM 1.0"},
3675         {PROTOCOL_COREPLUS,     "MICROSOFT NETWORKS 1.03"},
3676         {PROTOCOL_LANMAN1,      "MICROSOFT NETWORKS 3.0"},
3677         {PROTOCOL_LANMAN1,      "LANMAN1.0"},
3678         {PROTOCOL_LANMAN2,      "LM1.2X002"},
3679         {PROTOCOL_LANMAN2,      "DOS LANMAN2.1"},
3680         {PROTOCOL_LANMAN2,      "LANMAN2.1"},
3681         {PROTOCOL_LANMAN2,      "Samba"},
3682         {PROTOCOL_NT1,          "NT LANMAN 1.0"},
3683         {PROTOCOL_NT1,          "NT LM 0.12"},
3684         {PROTOCOL_SMB2_02,      "SMB 2.002"},
3685         {PROTOCOL_SMB2_10,      "SMB 2.???"},
3686 };
3687
3688 static const struct {
3689         enum protocol_types proto;
3690         uint16_t smb2_dialect;
3691 } smb2cli_prots[] = {
3692         {PROTOCOL_SMB2_02,      SMB2_DIALECT_REVISION_202},
3693         {PROTOCOL_SMB2_10,      SMB2_DIALECT_REVISION_210},
3694         {PROTOCOL_SMB2_22,      SMB2_DIALECT_REVISION_222},
3695         {PROTOCOL_SMB2_24,      SMB2_DIALECT_REVISION_224},
3696         {PROTOCOL_SMB3_00,      SMB3_DIALECT_REVISION_300},
3697         {PROTOCOL_SMB3_02,      SMB3_DIALECT_REVISION_302},
3698 };
3699
3700 struct smbXcli_negprot_state {
3701         struct smbXcli_conn *conn;
3702         struct tevent_context *ev;
3703         uint32_t timeout_msec;
3704         enum protocol_types min_protocol;
3705         enum protocol_types max_protocol;
3706
3707         struct {
3708                 uint8_t fixed[36];
3709                 uint8_t dyn[ARRAY_SIZE(smb2cli_prots)*2];
3710         } smb2;
3711 };
3712
3713 static void smbXcli_negprot_invalid_done(struct tevent_req *subreq);
3714 static struct tevent_req *smbXcli_negprot_smb1_subreq(struct smbXcli_negprot_state *state);
3715 static void smbXcli_negprot_smb1_done(struct tevent_req *subreq);
3716 static struct tevent_req *smbXcli_negprot_smb2_subreq(struct smbXcli_negprot_state *state);
3717 static void smbXcli_negprot_smb2_done(struct tevent_req *subreq);
3718 static NTSTATUS smbXcli_negprot_dispatch_incoming(struct smbXcli_conn *conn,
3719                                                   TALLOC_CTX *frame,
3720                                                   uint8_t *inbuf);
3721
3722 struct tevent_req *smbXcli_negprot_send(TALLOC_CTX *mem_ctx,
3723                                         struct tevent_context *ev,
3724                                         struct smbXcli_conn *conn,
3725                                         uint32_t timeout_msec,
3726                                         enum protocol_types min_protocol,
3727                                         enum protocol_types max_protocol)
3728 {
3729         struct tevent_req *req, *subreq;
3730         struct smbXcli_negprot_state *state;
3731
3732         req = tevent_req_create(mem_ctx, &state,
3733                                 struct smbXcli_negprot_state);
3734         if (req == NULL) {
3735                 return NULL;
3736         }
3737         state->conn = conn;
3738         state->ev = ev;
3739         state->timeout_msec = timeout_msec;
3740         state->min_protocol = min_protocol;
3741         state->max_protocol = max_protocol;
3742
3743         if (min_protocol == PROTOCOL_NONE) {
3744                 tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER_MIX);
3745                 return tevent_req_post(req, ev);
3746         }
3747
3748         if (max_protocol == PROTOCOL_NONE) {
3749                 tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER_MIX);
3750                 return tevent_req_post(req, ev);
3751         }
3752
3753         if (min_protocol > max_protocol) {
3754                 tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER_MIX);
3755                 return tevent_req_post(req, ev);
3756         }
3757
3758         if ((min_protocol < PROTOCOL_SMB2_02) &&
3759             (max_protocol < PROTOCOL_SMB2_02)) {
3760                 /*
3761                  * SMB1 only...
3762                  */
3763                 conn->dispatch_incoming = smb1cli_conn_dispatch_incoming;
3764
3765                 subreq = smbXcli_negprot_smb1_subreq(state);
3766                 if (tevent_req_nomem(subreq, req)) {
3767                         return tevent_req_post(req, ev);
3768                 }
3769                 tevent_req_set_callback(subreq, smbXcli_negprot_smb1_done, req);
3770                 return req;
3771         }
3772
3773         if ((min_protocol >= PROTOCOL_SMB2_02) &&
3774             (max_protocol >= PROTOCOL_SMB2_02)) {
3775                 /*
3776                  * SMB2 only...
3777                  */
3778                 conn->dispatch_incoming = smb2cli_conn_dispatch_incoming;
3779
3780                 subreq = smbXcli_negprot_smb2_subreq(state);
3781                 if (tevent_req_nomem(subreq, req)) {
3782                         return tevent_req_post(req, ev);
3783                 }
3784                 tevent_req_set_callback(subreq, smbXcli_negprot_smb2_done, req);
3785                 return req;
3786         }
3787
3788         /*
3789          * We send an SMB1 negprot with the SMB2 dialects
3790          * and expect a SMB1 or a SMB2 response.
3791          *
3792          * smbXcli_negprot_dispatch_incoming() will fix the
3793          * callback to match protocol of the response.
3794          */
3795         conn->dispatch_incoming = smbXcli_negprot_dispatch_incoming;
3796
3797         subreq = smbXcli_negprot_smb1_subreq(state);
3798         if (tevent_req_nomem(subreq, req)) {
3799                 return tevent_req_post(req, ev);
3800         }
3801         tevent_req_set_callback(subreq, smbXcli_negprot_invalid_done, req);
3802         return req;
3803 }
3804
3805 static void smbXcli_negprot_invalid_done(struct tevent_req *subreq)
3806 {
3807         struct tevent_req *req =
3808                 tevent_req_callback_data(subreq,
3809                 struct tevent_req);
3810         NTSTATUS status;
3811
3812         /*
3813          * we just want the low level error
3814          */
3815         status = tevent_req_simple_recv_ntstatus(subreq);
3816         TALLOC_FREE(subreq);
3817         if (tevent_req_nterror(req, status)) {
3818                 return;
3819         }
3820
3821         /* this should never happen */
3822         tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
3823 }
3824
3825 static struct tevent_req *smbXcli_negprot_smb1_subreq(struct smbXcli_negprot_state *state)
3826 {
3827         size_t i;
3828         DATA_BLOB bytes = data_blob_null;
3829         uint8_t flags;
3830         uint16_t flags2;
3831
3832         /* setup the protocol strings */
3833         for (i=0; i < ARRAY_SIZE(smb1cli_prots); i++) {
3834                 uint8_t c = 2;
3835                 bool ok;
3836
3837                 if (smb1cli_prots[i].proto < state->min_protocol) {
3838                         continue;
3839                 }
3840
3841                 if (smb1cli_prots[i].proto > state->max_protocol) {
3842                         continue;
3843                 }
3844
3845                 ok = data_blob_append(state, &bytes, &c, sizeof(c));
3846                 if (!ok) {
3847                         return NULL;
3848                 }
3849
3850                 /*
3851                  * We now it is already ascii and
3852                  * we want NULL termination.
3853                  */
3854                 ok = data_blob_append(state, &bytes,
3855                                       smb1cli_prots[i].smb1_name,
3856                                       strlen(smb1cli_prots[i].smb1_name)+1);
3857                 if (!ok) {
3858                         return NULL;
3859                 }
3860         }
3861
3862         smb1cli_req_flags(state->max_protocol,
3863                           state->conn->smb1.client.capabilities,
3864                           SMBnegprot,
3865                           0, 0, &flags,
3866                           0, 0, &flags2);
3867
3868         return smb1cli_req_send(state, state->ev, state->conn,
3869                                 SMBnegprot,
3870                                 flags, ~flags,
3871                                 flags2, ~flags2,
3872                                 state->timeout_msec,
3873                                 0xFFFE, 0, NULL, /* pid, tid, session */
3874                                 0, NULL, /* wct, vwv */
3875                                 bytes.length, bytes.data);
3876 }
3877
3878 static void smbXcli_negprot_smb1_done(struct tevent_req *subreq)
3879 {
3880         struct tevent_req *req =
3881                 tevent_req_callback_data(subreq,
3882                 struct tevent_req);
3883         struct smbXcli_negprot_state *state =
3884                 tevent_req_data(req,
3885                 struct smbXcli_negprot_state);
3886         struct smbXcli_conn *conn = state->conn;
3887         struct iovec *recv_iov = NULL;
3888         uint8_t *inhdr;
3889         uint8_t wct;
3890         uint16_t *vwv;
3891         uint32_t num_bytes;
3892         uint8_t *bytes;
3893         NTSTATUS status;
3894         uint16_t protnum;
3895         size_t i;
3896         size_t num_prots = 0;
3897         uint8_t flags;
3898         uint32_t client_capabilities = conn->smb1.client.capabilities;
3899         uint32_t both_capabilities;
3900         uint32_t server_capabilities = 0;
3901         uint32_t capabilities;
3902         uint32_t client_max_xmit = conn->smb1.client.max_xmit;
3903         uint32_t server_max_xmit = 0;
3904         uint32_t max_xmit;
3905         uint32_t server_max_mux = 0;
3906         uint16_t server_security_mode = 0;
3907         uint32_t server_session_key = 0;
3908         bool server_readbraw = false;
3909         bool server_writebraw = false;
3910         bool server_lockread = false;
3911         bool server_writeunlock = false;
3912         struct GUID server_guid = GUID_zero();
3913         DATA_BLOB server_gss_blob = data_blob_null;
3914         uint8_t server_challenge[8];
3915         char *server_workgroup = NULL;
3916         char *server_name = NULL;
3917         int server_time_zone = 0;
3918         NTTIME server_system_time = 0;
3919         static const struct smb1cli_req_expected_response expected[] = {
3920         {
3921                 .status = NT_STATUS_OK,
3922                 .wct = 0x11, /* NT1 */
3923         },
3924         {
3925                 .status = NT_STATUS_OK,
3926                 .wct = 0x0D, /* LM */
3927         },
3928         {
3929                 .status = NT_STATUS_OK,
3930                 .wct = 0x01, /* CORE */
3931         }
3932         };
3933
3934         ZERO_STRUCT(server_challenge);
3935
3936         status = smb1cli_req_recv(subreq, state,
3937                                   &recv_iov,
3938                                   &inhdr,
3939                                   &wct,
3940                                   &vwv,
3941                                   NULL, /* pvwv_offset */
3942                                   &num_bytes,
3943                                   &bytes,
3944                                   NULL, /* pbytes_offset */
3945                                   NULL, /* pinbuf */
3946                                   expected, ARRAY_SIZE(expected));
3947         TALLOC_FREE(subreq);
3948         if (tevent_req_nterror(req, status)) {
3949                 return;
3950         }
3951
3952         flags = CVAL(inhdr, HDR_FLG);
3953
3954         protnum = SVAL(vwv, 0);
3955
3956         for (i=0; i < ARRAY_SIZE(smb1cli_prots); i++) {
3957                 if (smb1cli_prots[i].proto < state->min_protocol) {
3958                         continue;
3959                 }
3960
3961                 if (smb1cli_prots[i].proto > state->max_protocol) {
3962                         continue;
3963                 }
3964
3965                 if (protnum != num_prots) {
3966                         num_prots++;
3967                         continue;
3968                 }
3969
3970                 conn->protocol = smb1cli_prots[i].proto;
3971                 break;
3972         }
3973
3974         if (conn->protocol == PROTOCOL_NONE) {
3975                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
3976                 return;
3977         }
3978
3979         if ((conn->protocol < PROTOCOL_NT1) && conn->mandatory_signing) {
3980                 DEBUG(0,("smbXcli_negprot: SMB signing is mandatory "
3981                          "and the selected protocol level doesn't support it.\n"));
3982                 tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
3983                 return;
3984         }
3985
3986         if (flags & FLAG_SUPPORT_LOCKREAD) {
3987                 server_lockread = true;
3988                 server_writeunlock = true;
3989         }
3990
3991         if (conn->protocol >= PROTOCOL_NT1) {
3992                 const char *client_signing = NULL;
3993                 bool server_mandatory = false;
3994                 bool server_allowed = false;
3995                 const char *server_signing = NULL;
3996                 bool ok;
3997                 uint8_t key_len;
3998
3999                 if (wct != 0x11) {
4000                         tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
4001                         return;
4002                 }
4003
4004                 /* NT protocol */
4005                 server_security_mode = CVAL(vwv + 1, 0);
4006                 server_max_mux = SVAL(vwv + 1, 1);
4007                 server_max_xmit = IVAL(vwv + 3, 1);
4008                 server_session_key = IVAL(vwv + 7, 1);
4009                 server_time_zone = SVALS(vwv + 15, 1);
4010                 server_time_zone *= 60;
4011                 /* this time arrives in real GMT */
4012                 server_system_time = BVAL(vwv + 11, 1);
4013                 server_capabilities = IVAL(vwv + 9, 1);
4014
4015                 key_len = CVAL(vwv + 16, 1);
4016
4017                 if (server_capabilities & CAP_RAW_MODE) {
4018                         server_readbraw = true;
4019                         server_writebraw = true;
4020                 }
4021                 if (server_capabilities & CAP_LOCK_AND_READ) {
4022                         server_lockread = true;
4023                 }
4024
4025                 if (server_capabilities & CAP_EXTENDED_SECURITY) {
4026                         DATA_BLOB blob1, blob2;
4027
4028                         if (num_bytes < 16) {
4029                                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
4030                                 return;
4031                         }
4032
4033                         blob1 = data_blob_const(bytes, 16);
4034                         status = GUID_from_data_blob(&blob1, &server_guid);
4035                         if (tevent_req_nterror(req, status)) {
4036                                 return;
4037                         }
4038
4039                         blob1 = data_blob_const(bytes+16, num_bytes-16);
4040                         blob2 = data_blob_dup_talloc(state, blob1);
4041                         if (blob1.length > 0 &&
4042                             tevent_req_nomem(blob2.data, req)) {
4043                                 return;
4044                         }
4045                         server_gss_blob = blob2;
4046                 } else {
4047                         DATA_BLOB blob1, blob2;
4048
4049                         if (num_bytes < key_len) {
4050                                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
4051                                 return;
4052                         }
4053
4054                         if (key_len != 0 && key_len != 8) {
4055                                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
4056                                 return;
4057                         }
4058
4059                         if (key_len == 8) {
4060                                 memcpy(server_challenge, bytes, 8);
4061                         }
4062
4063                         blob1 = data_blob_const(bytes+key_len, num_bytes-key_len);
4064                         blob2 = data_blob_const(bytes+key_len, num_bytes-key_len);
4065                         if (blob1.length > 0) {
4066                                 size_t len;
4067
4068                                 len = utf16_len_n(blob1.data,
4069                                                   blob1.length);
4070                                 blob1.length = len;
4071
4072                                 ok = convert_string_talloc(state,
4073                                                            CH_UTF16LE,
4074                                                            CH_UNIX,
4075                                                            blob1.data,
4076                                                            blob1.length,
4077                                                            &server_workgroup,
4078                                                            &len);
4079                                 if (!ok) {
4080                                         status = map_nt_error_from_unix_common(errno);
4081                                         tevent_req_nterror(req, status);
4082                                         return;
4083                                 }
4084                         }
4085
4086                         blob2.data += blob1.length;
4087                         blob2.length -= blob1.length;
4088                         if (blob2.length > 0) {
4089                                 size_t len;
4090
4091                                 len = utf16_len_n(blob1.data,
4092                                                   blob1.length);
4093                                 blob1.length = len;
4094
4095                                 ok = convert_string_talloc(state,
4096                                                            CH_UTF16LE,
4097                                                            CH_UNIX,
4098                                                            blob2.data,
4099                                                            blob2.length,
4100                                                            &server_name,
4101                                                            &len);
4102                                 if (!ok) {
4103                                         status = map_nt_error_from_unix_common(errno);
4104                                         tevent_req_nterror(req, status);
4105                                         return;
4106                                 }
4107                         }
4108                 }
4109
4110                 client_signing = "disabled";
4111                 if (conn->allow_signing) {
4112                         client_signing = "allowed";
4113                 }
4114                 if (conn->mandatory_signing) {
4115                         client_signing = "required";
4116                 }
4117
4118                 server_signing = "not supported";
4119                 if (server_security_mode & NEGOTIATE_SECURITY_SIGNATURES_ENABLED) {
4120                         server_signing = "supported";
4121                         server_allowed = true;
4122                 } else if (conn->mandatory_signing) {
4123                         /*
4124                          * We have mandatory signing as client
4125                          * lets assume the server will look at our
4126                          * FLAGS2_SMB_SECURITY_SIGNATURES_REQUIRED
4127                          * flag in the session setup
4128                          */
4129                         server_signing = "not announced";
4130                         server_allowed = true;
4131                 }
4132                 if (server_security_mode & NEGOTIATE_SECURITY_SIGNATURES_REQUIRED) {
4133                         server_signing = "required";
4134                         server_mandatory = true;
4135                 }
4136
4137                 ok = smb_signing_set_negotiated(conn->smb1.signing,
4138                                                 server_allowed,
4139                                                 server_mandatory);
4140                 if (!ok) {
4141                         DEBUG(1,("cli_negprot: SMB signing is required, "
4142                                  "but client[%s] and server[%s] mismatch\n",
4143                                  client_signing, server_signing));
4144                         tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
4145                         return;
4146                 }
4147
4148         } else if (conn->protocol >= PROTOCOL_LANMAN1) {
4149                 DATA_BLOB blob1;
4150                 uint8_t key_len;
4151                 time_t t;
4152
4153                 if (wct != 0x0D) {
4154                         tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
4155                         return;
4156                 }
4157
4158                 server_security_mode = SVAL(vwv + 1, 0);
4159                 server_max_xmit = SVAL(vwv + 2, 0);
4160                 server_max_mux = SVAL(vwv + 3, 0);
4161                 server_readbraw = ((SVAL(vwv + 5, 0) & 0x1) != 0);
4162                 server_writebraw = ((SVAL(vwv + 5, 0) & 0x2) != 0);
4163                 server_session_key = IVAL(vwv + 6, 0);
4164                 server_time_zone = SVALS(vwv + 10, 0);
4165                 server_time_zone *= 60;
4166                 /* this time is converted to GMT by make_unix_date */
4167                 t = pull_dos_date((const uint8_t *)(vwv + 8), server_time_zone);
4168                 unix_to_nt_time(&server_system_time, t);
4169                 key_len = SVAL(vwv + 11, 0);
4170
4171                 if (num_bytes < key_len) {
4172                         tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
4173                         return;
4174                 }
4175
4176                 if (key_len != 0 && key_len != 8) {
4177                         tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
4178                         return;
4179                 }
4180
4181                 if (key_len == 8) {
4182                         memcpy(server_challenge, bytes, 8);
4183                 }
4184
4185                 blob1 = data_blob_const(bytes+key_len, num_bytes-key_len);
4186                 if (blob1.length > 0) {
4187                         size_t len;
4188                         bool ok;
4189
4190                         len = utf16_len_n(blob1.data,
4191                                           blob1.length);
4192                         blob1.length = len;
4193
4194                         ok = convert_string_talloc(state,
4195                                                    CH_DOS,
4196                                                    CH_UNIX,
4197                                                    blob1.data,
4198                                                    blob1.length,
4199                                                    &server_workgroup,
4200                                                    &len);
4201                         if (!ok) {
4202                                 status = map_nt_error_from_unix_common(errno);
4203                                 tevent_req_nterror(req, status);
4204                                 return;
4205                         }
4206                 }
4207
4208         } else {
4209                 /* the old core protocol */
4210                 server_time_zone = get_time_zone(time(NULL));
4211                 server_max_xmit = 1024;
4212                 server_max_mux = 1;
4213         }
4214
4215         if (server_max_xmit < 1024) {
4216                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
4217                 return;
4218         }
4219
4220         if (server_max_mux < 1) {
4221                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
4222                 return;
4223         }
4224
4225         /*
4226          * Now calculate the negotiated capabilities
4227          * based on the mask for:
4228          * - client only flags
4229          * - flags used in both directions
4230          * - server only flags
4231          */
4232         both_capabilities = client_capabilities & server_capabilities;
4233         capabilities = client_capabilities & SMB_CAP_CLIENT_MASK;
4234         capabilities |= both_capabilities & SMB_CAP_BOTH_MASK;
4235         capabilities |= server_capabilities & SMB_CAP_SERVER_MASK;
4236
4237         max_xmit = MIN(client_max_xmit, server_max_xmit);
4238
4239         conn->smb1.server.capabilities = server_capabilities;
4240         conn->smb1.capabilities = capabilities;
4241
4242         conn->smb1.server.max_xmit = server_max_xmit;
4243         conn->smb1.max_xmit = max_xmit;
4244
4245         conn->smb1.server.max_mux = server_max_mux;
4246
4247         conn->smb1.server.security_mode = server_security_mode;
4248
4249         conn->smb1.server.readbraw = server_readbraw;
4250         conn->smb1.server.writebraw = server_writebraw;
4251         conn->smb1.server.lockread = server_lockread;
4252         conn->smb1.server.writeunlock = server_writeunlock;
4253
4254         conn->smb1.server.session_key = server_session_key;
4255
4256         talloc_steal(conn, server_gss_blob.data);
4257         conn->smb1.server.gss_blob = server_gss_blob;
4258         conn->smb1.server.guid = server_guid;
4259         memcpy(conn->smb1.server.challenge, server_challenge, 8);
4260         conn->smb1.server.workgroup = talloc_move(conn, &server_workgroup);
4261         conn->smb1.server.name = talloc_move(conn, &server_name);
4262
4263         conn->smb1.server.time_zone = server_time_zone;
4264         conn->smb1.server.system_time = server_system_time;
4265
4266         tevent_req_done(req);
4267 }
4268
4269 static struct tevent_req *smbXcli_negprot_smb2_subreq(struct smbXcli_negprot_state *state)
4270 {
4271         size_t i;
4272         uint8_t *buf;
4273         uint16_t dialect_count = 0;
4274
4275         buf = state->smb2.dyn;
4276         for (i=0; i < ARRAY_SIZE(smb2cli_prots); i++) {
4277                 if (smb2cli_prots[i].proto < state->min_protocol) {
4278                         continue;
4279                 }
4280
4281                 if (smb2cli_prots[i].proto > state->max_protocol) {
4282                         continue;
4283                 }
4284
4285                 SSVAL(buf, dialect_count*2, smb2cli_prots[i].smb2_dialect);
4286                 dialect_count++;
4287         }
4288
4289         buf = state->smb2.fixed;
4290         SSVAL(buf, 0, 36);
4291         SSVAL(buf, 2, dialect_count);
4292         SSVAL(buf, 4, state->conn->smb2.client.security_mode);
4293         SSVAL(buf, 6, 0);       /* Reserved */
4294         if (state->max_protocol >= PROTOCOL_SMB2_22) {
4295                 SIVAL(buf, 8, state->conn->smb2.client.capabilities);
4296         } else {
4297                 SIVAL(buf, 8, 0);       /* Capabilities */
4298         }
4299         if (state->max_protocol >= PROTOCOL_SMB2_10) {
4300                 NTSTATUS status;
4301                 DATA_BLOB blob;
4302
4303                 status = GUID_to_ndr_blob(&state->conn->smb2.client.guid,
4304                                           state, &blob);
4305                 if (!NT_STATUS_IS_OK(status)) {
4306                         return NULL;
4307                 }
4308                 memcpy(buf+12, blob.data, 16); /* ClientGuid */
4309         } else {
4310                 memset(buf+12, 0, 16);  /* ClientGuid */
4311         }
4312         SBVAL(buf, 28, 0);      /* ClientStartTime */
4313
4314         return smb2cli_req_send(state, state->ev,
4315                                 state->conn, SMB2_OP_NEGPROT,
4316                                 0, 0, /* flags */
4317                                 state->timeout_msec,
4318                                 NULL, NULL, /* tcon, session */
4319                                 state->smb2.fixed, sizeof(state->smb2.fixed),
4320                                 state->smb2.dyn, dialect_count*2,
4321                                 UINT16_MAX); /* max_dyn_len */
4322 }
4323
4324 static void smbXcli_negprot_smb2_done(struct tevent_req *subreq)
4325 {
4326         struct tevent_req *req =
4327                 tevent_req_callback_data(subreq,
4328                 struct tevent_req);
4329         struct smbXcli_negprot_state *state =
4330                 tevent_req_data(req,
4331                 struct smbXcli_negprot_state);
4332         struct smbXcli_conn *conn = state->conn;
4333         size_t security_offset, security_length;
4334         DATA_BLOB blob;
4335         NTSTATUS status;
4336         struct iovec *iov;
4337         uint8_t *body;
4338         size_t i;
4339         uint16_t dialect_revision;
4340         static const struct smb2cli_req_expected_response expected[] = {
4341         {
4342                 .status = NT_STATUS_OK,
4343                 .body_size = 0x41
4344         }
4345         };
4346
4347         status = smb2cli_req_recv(subreq, state, &iov,
4348                                   expected, ARRAY_SIZE(expected));
4349         TALLOC_FREE(subreq);
4350         if (tevent_req_nterror(req, status)) {
4351                 return;
4352         }
4353
4354         body = (uint8_t *)iov[1].iov_base;
4355
4356         dialect_revision = SVAL(body, 4);
4357
4358         for (i=0; i < ARRAY_SIZE(smb2cli_prots); i++) {
4359                 if (smb2cli_prots[i].proto < state->min_protocol) {
4360                         continue;
4361                 }
4362
4363                 if (smb2cli_prots[i].proto > state->max_protocol) {
4364                         continue;
4365                 }
4366
4367                 if (smb2cli_prots[i].smb2_dialect != dialect_revision) {
4368                         continue;
4369                 }
4370
4371                 conn->protocol = smb2cli_prots[i].proto;
4372                 break;
4373         }
4374
4375         if (conn->protocol == PROTOCOL_NONE) {
4376                 if (state->min_protocol >= PROTOCOL_SMB2_02) {
4377                         tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
4378                         return;
4379                 }
4380
4381                 if (dialect_revision != SMB2_DIALECT_REVISION_2FF) {
4382                         tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
4383                         return;
4384                 }
4385
4386                 /* make sure we do not loop forever */
4387                 state->min_protocol = PROTOCOL_SMB2_02;
4388
4389                 /*
4390                  * send a SMB2 negprot, in order to negotiate
4391                  * the SMB2 dialect.
4392                  */
4393                 subreq = smbXcli_negprot_smb2_subreq(state);
4394                 if (tevent_req_nomem(subreq, req)) {
4395                         return;
4396                 }
4397                 tevent_req_set_callback(subreq, smbXcli_negprot_smb2_done, req);
4398                 return;
4399         }
4400
4401         conn->smb2.server.security_mode = SVAL(body, 2);
4402
4403         blob = data_blob_const(body + 8, 16);
4404         status = GUID_from_data_blob(&blob, &conn->smb2.server.guid);
4405         if (tevent_req_nterror(req, status)) {
4406                 return;
4407         }
4408
4409         conn->smb2.server.capabilities  = IVAL(body, 24);
4410         conn->smb2.server.max_trans_size= IVAL(body, 28);
4411         conn->smb2.server.max_read_size = IVAL(body, 32);
4412         conn->smb2.server.max_write_size= IVAL(body, 36);
4413         conn->smb2.server.system_time   = BVAL(body, 40);
4414         conn->smb2.server.start_time    = BVAL(body, 48);
4415
4416         security_offset = SVAL(body, 56);
4417         security_length = SVAL(body, 58);
4418
4419         if (security_offset != SMB2_HDR_BODY + iov[1].iov_len) {
4420                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
4421                 return;
4422         }
4423
4424         if (security_length > iov[2].iov_len) {
4425                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
4426                 return;
4427         }
4428
4429         conn->smb2.server.gss_blob = data_blob_talloc(conn,
4430                                                 iov[2].iov_base,
4431                                                 security_length);
4432         if (tevent_req_nomem(conn->smb2.server.gss_blob.data, req)) {
4433                 return;
4434         }
4435
4436         tevent_req_done(req);
4437 }
4438
4439 static NTSTATUS smbXcli_negprot_dispatch_incoming(struct smbXcli_conn *conn,
4440                                                   TALLOC_CTX *tmp_mem,
4441                                                   uint8_t *inbuf)
4442 {
4443         size_t num_pending = talloc_array_length(conn->pending);
4444         struct tevent_req *subreq;
4445         struct smbXcli_req_state *substate;
4446         struct tevent_req *req;
4447         uint32_t protocol_magic;
4448         size_t inbuf_len = smb_len_nbt(inbuf);
4449
4450         if (num_pending != 1) {
4451                 return NT_STATUS_INTERNAL_ERROR;
4452         }
4453
4454         if (inbuf_len < 4) {
4455                 return NT_STATUS_INVALID_NETWORK_RESPONSE;
4456         }
4457
4458         subreq = conn->pending[0];
4459         substate = tevent_req_data(subreq, struct smbXcli_req_state);
4460         req = tevent_req_callback_data(subreq, struct tevent_req);
4461
4462         protocol_magic = IVAL(inbuf, 4);
4463
4464         switch (protocol_magic) {
4465         case SMB_MAGIC:
4466                 tevent_req_set_callback(subreq, smbXcli_negprot_smb1_done, req);
4467                 conn->dispatch_incoming = smb1cli_conn_dispatch_incoming;
4468                 return smb1cli_conn_dispatch_incoming(conn, tmp_mem, inbuf);
4469
4470         case SMB2_MAGIC:
4471                 if (substate->smb2.recv_iov == NULL) {
4472                         /*
4473                          * For the SMB1 negprot we have move it.
4474                          */
4475                         substate->smb2.recv_iov = substate->smb1.recv_iov;
4476                         substate->smb1.recv_iov = NULL;
4477                 }
4478
4479                 /*
4480                  * we got an SMB2 answer, which consumed sequence number 0
4481                  * so we need to use 1 as the next one.
4482                  *
4483                  * we also need to set the current credits to 0
4484                  * as we consumed the initial one. The SMB2 answer
4485                  * hopefully grant us a new credit.
4486                  */
4487                 conn->smb2.mid = 1;
4488                 conn->smb2.cur_credits = 0;
4489                 tevent_req_set_callback(subreq, smbXcli_negprot_smb2_done, req);
4490                 conn->dispatch_incoming = smb2cli_conn_dispatch_incoming;
4491                 return smb2cli_conn_dispatch_incoming(conn, tmp_mem, inbuf);
4492         }
4493
4494         DEBUG(10, ("Got non-SMB PDU\n"));
4495         return NT_STATUS_INVALID_NETWORK_RESPONSE;
4496 }
4497
4498 NTSTATUS smbXcli_negprot_recv(struct tevent_req *req)
4499 {
4500         return tevent_req_simple_recv_ntstatus(req);
4501 }
4502
4503 NTSTATUS smbXcli_negprot(struct smbXcli_conn *conn,
4504                          uint32_t timeout_msec,
4505                          enum protocol_types min_protocol,
4506                          enum protocol_types max_protocol)
4507 {
4508         TALLOC_CTX *frame = talloc_stackframe();
4509         struct tevent_context *ev;
4510         struct tevent_req *req;
4511         NTSTATUS status = NT_STATUS_NO_MEMORY;
4512         bool ok;
4513
4514         if (smbXcli_conn_has_async_calls(conn)) {
4515                 /*
4516                  * Can't use sync call while an async call is in flight
4517                  */
4518                 status = NT_STATUS_INVALID_PARAMETER_MIX;
4519                 goto fail;
4520         }
4521         ev = samba_tevent_context_init(frame);
4522         if (ev == NULL) {
4523                 goto fail;
4524         }
4525         req = smbXcli_negprot_send(frame, ev, conn, timeout_msec,
4526                                    min_protocol, max_protocol);
4527         if (req == NULL) {
4528                 goto fail;
4529         }
4530         ok = tevent_req_poll(req, ev);
4531         if (!ok) {
4532                 status = map_nt_error_from_unix_common(errno);
4533                 goto fail;
4534         }
4535         status = smbXcli_negprot_recv(req);
4536  fail:
4537         TALLOC_FREE(frame);
4538         return status;
4539 }
4540
4541 static int smbXcli_session_destructor(struct smbXcli_session *session)
4542 {
4543         if (session->conn == NULL) {
4544                 return 0;
4545         }
4546
4547         DLIST_REMOVE(session->conn->sessions, session);
4548         return 0;
4549 }
4550
4551 struct smbXcli_session *smbXcli_session_create(TALLOC_CTX *mem_ctx,
4552                                                struct smbXcli_conn *conn)
4553 {
4554         struct smbXcli_session *session;
4555
4556         session = talloc_zero(mem_ctx, struct smbXcli_session);
4557         if (session == NULL) {
4558                 return NULL;
4559         }
4560         session->smb2 = talloc_zero(session, struct smb2cli_session);
4561         if (session->smb2 == NULL) {
4562                 talloc_free(session);
4563                 return NULL;
4564         }
4565         talloc_set_destructor(session, smbXcli_session_destructor);
4566
4567         DLIST_ADD_END(conn->sessions, session, struct smbXcli_session *);
4568         session->conn = conn;
4569
4570         return session;
4571 }
4572
4573 struct smbXcli_session *smbXcli_session_copy(TALLOC_CTX *mem_ctx,
4574                                                 struct smbXcli_session *src)
4575 {
4576         struct smbXcli_session *session;
4577
4578         session = talloc_zero(mem_ctx, struct smbXcli_session);
4579         if (session == NULL) {
4580                 return NULL;
4581         }
4582         session->smb2 = talloc_zero(session, struct smb2cli_session);
4583         if (session->smb2 == NULL) {
4584                 talloc_free(session);
4585                 return NULL;
4586         }
4587
4588         session->conn = src->conn;
4589         *session->smb2 = *src->smb2;
4590         session->smb2_channel = src->smb2_channel;
4591         session->disconnect_expired = src->disconnect_expired;
4592
4593         DLIST_ADD_END(src->conn->sessions, session, struct smbXcli_session *);
4594         talloc_set_destructor(session, smbXcli_session_destructor);
4595
4596         return session;
4597 }
4598
4599
4600 NTSTATUS smbXcli_session_application_key(struct smbXcli_session *session,
4601                                          TALLOC_CTX *mem_ctx,
4602                                          DATA_BLOB *key)
4603 {
4604         const DATA_BLOB *application_key;
4605
4606         *key = data_blob_null;
4607
4608         if (session->conn == NULL) {
4609                 return NT_STATUS_NO_USER_SESSION_KEY;
4610         }
4611
4612         if (session->conn->protocol >= PROTOCOL_SMB2_02) {
4613                 application_key = &session->smb2->application_key;
4614         } else {
4615                 application_key = &session->smb1.application_key;
4616         }
4617
4618         if (application_key->length == 0) {
4619                 return NT_STATUS_NO_USER_SESSION_KEY;
4620         }
4621
4622         *key = data_blob_dup_talloc(mem_ctx, *application_key);
4623         if (key->data == NULL) {
4624                 return NT_STATUS_NO_MEMORY;
4625         }
4626
4627         return NT_STATUS_OK;
4628 }
4629
4630 void smbXcli_session_set_disconnect_expired(struct smbXcli_session *session)
4631 {
4632         session->disconnect_expired = true;
4633 }
4634
4635 uint16_t smb1cli_session_current_id(struct smbXcli_session *session)
4636 {
4637         return session->smb1.session_id;
4638 }
4639
4640 void smb1cli_session_set_id(struct smbXcli_session *session,
4641                             uint16_t session_id)
4642 {
4643         session->smb1.session_id = session_id;
4644 }
4645
4646 NTSTATUS smb1cli_session_set_session_key(struct smbXcli_session *session,
4647                                          const DATA_BLOB _session_key)
4648 {
4649         struct smbXcli_conn *conn = session->conn;
4650         uint8_t session_key[16];
4651
4652         if (conn == NULL) {
4653                 return NT_STATUS_INVALID_PARAMETER_MIX;
4654         }
4655
4656         if (session->smb1.application_key.length != 0) {
4657                 /*
4658                  * TODO: do not allow this...
4659                  *
4660                  * return NT_STATUS_INVALID_PARAMETER_MIX;
4661                  */
4662                 data_blob_clear_free(&session->smb1.application_key);
4663                 session->smb1.protected_key = false;
4664         }
4665
4666         if (_session_key.length == 0) {
4667                 return NT_STATUS_OK;
4668         }
4669
4670         ZERO_STRUCT(session_key);
4671         memcpy(session_key, _session_key.data,
4672                MIN(_session_key.length, sizeof(session_key)));
4673
4674         session->smb1.application_key = data_blob_talloc(session,
4675                                                          session_key,
4676                                                          sizeof(session_key));
4677         ZERO_STRUCT(session_key);
4678         if (session->smb1.application_key.data == NULL) {
4679                 return NT_STATUS_NO_MEMORY;
4680         }
4681
4682         session->smb1.protected_key = false;
4683
4684         return NT_STATUS_OK;
4685 }
4686
4687 NTSTATUS smb1cli_session_protect_session_key(struct smbXcli_session *session)
4688 {
4689         if (session->smb1.protected_key) {
4690                 /* already protected */
4691                 return NT_STATUS_OK;
4692         }
4693
4694         if (session->smb1.application_key.length != 16) {
4695                 return NT_STATUS_INVALID_PARAMETER_MIX;
4696         }
4697
4698         smb_key_derivation(session->smb1.application_key.data,
4699                            session->smb1.application_key.length,
4700                            session->smb1.application_key.data);
4701
4702         session->smb1.protected_key = true;
4703
4704         return NT_STATUS_OK;
4705 }
4706
4707 uint8_t smb2cli_session_security_mode(struct smbXcli_session *session)
4708 {
4709         struct smbXcli_conn *conn = session->conn;
4710         uint8_t security_mode = 0;
4711
4712         if (conn == NULL) {
4713                 return security_mode;
4714         }
4715
4716         security_mode = SMB2_NEGOTIATE_SIGNING_ENABLED;
4717         if (conn->mandatory_signing) {
4718                 security_mode |= SMB2_NEGOTIATE_SIGNING_REQUIRED;
4719         }
4720
4721         return security_mode;
4722 }
4723
4724 uint64_t smb2cli_session_current_id(struct smbXcli_session *session)
4725 {
4726         return session->smb2->session_id;
4727 }
4728
4729 uint16_t smb2cli_session_get_flags(struct smbXcli_session *session)
4730 {
4731         return session->smb2->session_flags;
4732 }
4733
4734 void smb2cli_session_set_id_and_flags(struct smbXcli_session *session,
4735                                       uint64_t session_id,
4736                                       uint16_t session_flags)
4737 {
4738         session->smb2->session_id = session_id;
4739         session->smb2->session_flags = session_flags;
4740 }
4741
4742 void smb2cli_session_increment_channel_sequence(struct smbXcli_session *session)
4743 {
4744         session->smb2->channel_sequence += 1;
4745 }
4746
4747 NTSTATUS smb2cli_session_set_session_key(struct smbXcli_session *session,
4748                                          const DATA_BLOB _session_key,
4749                                          const struct iovec *recv_iov)
4750 {
4751         struct smbXcli_conn *conn = session->conn;
4752         uint16_t no_sign_flags;
4753         uint8_t session_key[16];
4754         bool check_signature = true;
4755         uint32_t hdr_flags;
4756         NTSTATUS status;
4757
4758         if (conn == NULL) {
4759                 return NT_STATUS_INVALID_PARAMETER_MIX;
4760         }
4761
4762         if (recv_iov[0].iov_len != SMB2_HDR_BODY) {
4763                 return NT_STATUS_INVALID_PARAMETER_MIX;
4764         }
4765
4766         no_sign_flags = SMB2_SESSION_FLAG_IS_GUEST | SMB2_SESSION_FLAG_IS_NULL;
4767
4768         if (session->smb2->session_flags & no_sign_flags) {
4769                 session->smb2->should_sign = false;
4770                 return NT_STATUS_OK;
4771         }
4772
4773         if (session->smb2->signing_key.length != 0) {
4774                 return NT_STATUS_INVALID_PARAMETER_MIX;
4775         }
4776
4777         ZERO_STRUCT(session_key);
4778         memcpy(session_key, _session_key.data,
4779                MIN(_session_key.length, sizeof(session_key)));
4780
4781         session->smb2->signing_key = data_blob_talloc(session,
4782                                                      session_key,
4783                                                      sizeof(session_key));
4784         if (session->smb2->signing_key.data == NULL) {
4785                 ZERO_STRUCT(session_key);
4786                 return NT_STATUS_NO_MEMORY;
4787         }
4788
4789         if (conn->protocol >= PROTOCOL_SMB2_24) {
4790                 const DATA_BLOB label = data_blob_string_const_null("SMB2AESCMAC");
4791                 const DATA_BLOB context = data_blob_string_const_null("SmbSign");
4792
4793                 smb2_key_derivation(session_key, sizeof(session_key),
4794                                     label.data, label.length,
4795                                     context.data, context.length,
4796                                     session->smb2->signing_key.data);
4797         }
4798
4799         session->smb2->encryption_key = data_blob_dup_talloc(session,
4800                                                 session->smb2->signing_key);
4801         if (session->smb2->encryption_key.data == NULL) {
4802                 ZERO_STRUCT(session_key);
4803                 return NT_STATUS_NO_MEMORY;
4804         }
4805
4806         if (conn->protocol >= PROTOCOL_SMB2_24) {
4807                 const DATA_BLOB label = data_blob_string_const_null("SMB2AESCCM");
4808                 const DATA_BLOB context = data_blob_string_const_null("ServerIn ");
4809
4810                 smb2_key_derivation(session_key, sizeof(session_key),
4811                                     label.data, label.length,
4812                                     context.data, context.length,
4813                                     session->smb2->encryption_key.data);
4814         }
4815
4816         session->smb2->decryption_key = data_blob_dup_talloc(session,
4817                                                 session->smb2->signing_key);
4818         if (session->smb2->decryption_key.data == NULL) {
4819                 ZERO_STRUCT(session_key);
4820                 return NT_STATUS_NO_MEMORY;
4821         }
4822
4823         if (conn->protocol >= PROTOCOL_SMB2_24) {
4824                 const DATA_BLOB label = data_blob_string_const_null("SMB2AESCCM");
4825                 const DATA_BLOB context = data_blob_string_const_null("ServerOut");
4826
4827                 smb2_key_derivation(session_key, sizeof(session_key),
4828                                     label.data, label.length,
4829                                     context.data, context.length,
4830                                     session->smb2->decryption_key.data);
4831         }
4832
4833         session->smb2->application_key = data_blob_dup_talloc(session,
4834                                                 session->smb2->signing_key);
4835         if (session->smb2->application_key.data == NULL) {
4836                 ZERO_STRUCT(session_key);
4837                 return NT_STATUS_NO_MEMORY;
4838         }
4839
4840         if (conn->protocol >= PROTOCOL_SMB2_24) {
4841                 const DATA_BLOB label = data_blob_string_const_null("SMB2APP");
4842                 const DATA_BLOB context = data_blob_string_const_null("SmbRpc");
4843
4844                 smb2_key_derivation(session_key, sizeof(session_key),
4845                                     label.data, label.length,
4846                                     context.data, context.length,
4847                                     session->smb2->application_key.data);
4848         }
4849         ZERO_STRUCT(session_key);
4850
4851         session->smb2_channel.signing_key = data_blob_dup_talloc(session,
4852                                                 session->smb2->signing_key);
4853         if (session->smb2_channel.signing_key.data == NULL) {
4854                 return NT_STATUS_NO_MEMORY;
4855         }
4856
4857         check_signature = conn->mandatory_signing;
4858
4859         hdr_flags = IVAL(recv_iov[0].iov_base, SMB2_HDR_FLAGS);
4860         if (hdr_flags & SMB2_HDR_FLAG_SIGNED) {
4861                 /*
4862                  * Sadly some vendors don't sign the
4863                  * final SMB2 session setup response
4864                  *
4865                  * At least Windows and Samba are always doing this
4866                  * if there's a session key available.
4867                  *
4868                  * We only check the signature if it's mandatory
4869                  * or SMB2_HDR_FLAG_SIGNED is provided.
4870                  */
4871                 check_signature = true;
4872         }
4873
4874         if (check_signature) {
4875                 status = smb2_signing_check_pdu(session->smb2_channel.signing_key,
4876                                                 session->conn->protocol,
4877                                                 recv_iov, 3);
4878                 if (!NT_STATUS_IS_OK(status)) {
4879                         return status;
4880                 }
4881         }
4882
4883         session->smb2->should_sign = false;
4884         session->smb2->should_encrypt = false;
4885
4886         if (conn->desire_signing) {
4887                 session->smb2->should_sign = true;
4888         }
4889
4890         if (conn->smb2.server.security_mode & SMB2_NEGOTIATE_SIGNING_REQUIRED) {
4891                 session->smb2->should_sign = true;
4892         }
4893
4894         if (session->smb2->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA) {
4895                 session->smb2->should_encrypt = true;
4896         }
4897
4898         if (conn->protocol < PROTOCOL_SMB2_24) {
4899                 session->smb2->should_encrypt = false;
4900         }
4901
4902         if (!(conn->smb2.server.capabilities & SMB2_CAP_ENCRYPTION)) {
4903                 session->smb2->should_encrypt = false;
4904         }
4905
4906         generate_random_buffer((uint8_t *)&session->smb2->nonce_high,
4907                                sizeof(session->smb2->nonce_high));
4908         session->smb2->nonce_low = 1;
4909
4910         return NT_STATUS_OK;
4911 }
4912
4913 NTSTATUS smb2cli_session_create_channel(TALLOC_CTX *mem_ctx,
4914                                         struct smbXcli_session *session1,
4915                                         struct smbXcli_conn *conn,
4916                                         struct smbXcli_session **_session2)
4917 {
4918         struct smbXcli_session *session2;
4919
4920         if (session1->smb2->signing_key.length == 0) {
4921                 return NT_STATUS_INVALID_PARAMETER_MIX;
4922         }
4923
4924         if (conn == NULL) {
4925                 return NT_STATUS_INVALID_PARAMETER_MIX;
4926         }
4927
4928         session2 = talloc_zero(mem_ctx, struct smbXcli_session);
4929         if (session2 == NULL) {
4930                 return NT_STATUS_NO_MEMORY;
4931         }
4932         session2->smb2 = talloc_reference(session2, session1->smb2);
4933         if (session2->smb2 == NULL) {
4934                 talloc_free(session2);
4935                 return NT_STATUS_NO_MEMORY;
4936         }
4937
4938         talloc_set_destructor(session2, smbXcli_session_destructor);
4939         DLIST_ADD_END(conn->sessions, session2, struct smbXcli_session *);
4940         session2->conn = conn;
4941
4942         *_session2 = session2;
4943         return NT_STATUS_OK;
4944 }
4945
4946 NTSTATUS smb2cli_session_set_channel_key(struct smbXcli_session *session,
4947                                          const DATA_BLOB _channel_key,
4948                                          const struct iovec *recv_iov)
4949 {
4950         struct smbXcli_conn *conn = session->conn;
4951         uint8_t channel_key[16];
4952         NTSTATUS status;
4953
4954         if (conn == NULL) {
4955                 return NT_STATUS_INVALID_PARAMETER_MIX;
4956         }
4957
4958         if (session->smb2_channel.signing_key.length != 0) {
4959                 return NT_STATUS_INVALID_PARAMETER_MIX;
4960         }
4961
4962         ZERO_STRUCT(channel_key);
4963         memcpy(channel_key, _channel_key.data,
4964                MIN(_channel_key.length, sizeof(channel_key)));
4965
4966         session->smb2_channel.signing_key = data_blob_talloc(session,
4967                                                 channel_key,
4968                                                 sizeof(channel_key));
4969         if (session->smb2_channel.signing_key.data == NULL) {
4970                 ZERO_STRUCT(channel_key);
4971                 return NT_STATUS_NO_MEMORY;
4972         }
4973
4974         if (conn->protocol >= PROTOCOL_SMB2_24) {
4975                 const DATA_BLOB label = data_blob_string_const_null("SMB2AESCMAC");
4976                 const DATA_BLOB context = data_blob_string_const_null("SmbSign");
4977
4978                 smb2_key_derivation(channel_key, sizeof(channel_key),
4979                                     label.data, label.length,
4980                                     context.data, context.length,
4981                                     session->smb2_channel.signing_key.data);
4982         }
4983         ZERO_STRUCT(channel_key);
4984
4985         status = smb2_signing_check_pdu(session->smb2_channel.signing_key,
4986                                         session->conn->protocol,
4987                                         recv_iov, 3);
4988         if (!NT_STATUS_IS_OK(status)) {
4989                 return status;
4990         }
4991
4992         return NT_STATUS_OK;
4993 }
4994
4995 NTSTATUS smb2cli_session_encryption_on(struct smbXcli_session *session)
4996 {
4997         if (session->smb2->should_encrypt) {
4998                 return NT_STATUS_OK;
4999         }
5000
5001         if (session->conn->protocol < PROTOCOL_SMB2_24) {
5002                 return NT_STATUS_NOT_SUPPORTED;
5003         }
5004
5005         if (!(session->conn->smb2.server.capabilities & SMB2_CAP_ENCRYPTION)) {
5006                 return NT_STATUS_NOT_SUPPORTED;
5007         }
5008
5009         if (session->smb2->signing_key.data == NULL) {
5010                 return NT_STATUS_NOT_SUPPORTED;
5011         }
5012         session->smb2->should_encrypt = true;
5013         return NT_STATUS_OK;
5014 }
5015
5016 struct smbXcli_tcon *smbXcli_tcon_create(TALLOC_CTX *mem_ctx)
5017 {
5018         struct smbXcli_tcon *tcon;
5019
5020         tcon = talloc_zero(mem_ctx, struct smbXcli_tcon);
5021         if (tcon == NULL) {
5022                 return NULL;
5023         }
5024
5025         return tcon;
5026 }
5027
5028 uint16_t smb1cli_tcon_current_id(struct smbXcli_tcon *tcon)
5029 {
5030         return tcon->smb1.tcon_id;
5031 }
5032
5033 void smb1cli_tcon_set_id(struct smbXcli_tcon *tcon, uint16_t tcon_id)
5034 {
5035         tcon->smb1.tcon_id = tcon_id;
5036 }
5037
5038 bool smb1cli_tcon_set_values(struct smbXcli_tcon *tcon,
5039                              uint16_t tcon_id,
5040                              uint16_t optional_support,
5041                              uint32_t maximal_access,
5042                              uint32_t guest_maximal_access,
5043                              const char *service,
5044                              const char *fs_type)
5045 {
5046         tcon->smb1.tcon_id = tcon_id;
5047         tcon->smb1.optional_support = optional_support;
5048         tcon->smb1.maximal_access = maximal_access;
5049         tcon->smb1.guest_maximal_access = guest_maximal_access;
5050
5051         TALLOC_FREE(tcon->smb1.service);
5052         tcon->smb1.service = talloc_strdup(tcon, service);
5053         if (service != NULL && tcon->smb1.service == NULL) {
5054                 return false;
5055         }
5056
5057         TALLOC_FREE(tcon->smb1.fs_type);
5058         tcon->smb1.fs_type = talloc_strdup(tcon, fs_type);
5059         if (fs_type != NULL && tcon->smb1.fs_type == NULL) {
5060                 return false;
5061         }
5062
5063         return true;
5064 }
5065
5066 uint32_t smb2cli_tcon_current_id(struct smbXcli_tcon *tcon)
5067 {
5068         return tcon->smb2.tcon_id;
5069 }
5070
5071 uint32_t smb2cli_tcon_capabilities(struct smbXcli_tcon *tcon)
5072 {
5073         return tcon->smb2.capabilities;
5074 }
5075
5076 void smb2cli_tcon_set_values(struct smbXcli_tcon *tcon,
5077                              struct smbXcli_session *session,
5078                              uint32_t tcon_id,
5079                              uint8_t type,
5080                              uint32_t flags,
5081                              uint32_t capabilities,
5082                              uint32_t maximal_access)
5083 {
5084         tcon->smb2.tcon_id = tcon_id;
5085         tcon->smb2.type = type;
5086         tcon->smb2.flags = flags;
5087         tcon->smb2.capabilities = capabilities;
5088         tcon->smb2.maximal_access = maximal_access;
5089
5090         tcon->smb2.should_encrypt = false;
5091
5092         if (session == NULL) {
5093                 return;
5094         }
5095
5096         tcon->smb2.should_encrypt = session->smb2->should_encrypt;
5097
5098         if (flags & SMB2_SHAREFLAG_ENCRYPT_DATA) {
5099                 tcon->smb2.should_encrypt = true;
5100         }
5101 }
5102
5103 bool smb2cli_tcon_is_encryption_on(struct smbXcli_tcon *tcon)
5104 {
5105         return tcon->smb2.should_encrypt;
5106 }