source4/libcli/smb_composite/sesssetup.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    Copyright (C) Andrew Tridgell 2005
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19 /*
  20   a composite API for making handling a generic async session setup
  21 */
  22
  23 #include "includes.h"
  24 #include <tevent.h>
  25 #include "libcli/raw/libcliraw.h"
  26 #include "libcli/raw/raw_proto.h"
  27 #include "libcli/composite/composite.h"
  28 #include "libcli/smb_composite/smb_composite.h"
  29 #include "libcli/auth/libcli_auth.h"
  30 #include "auth/auth.h"
  31 #include "auth/gensec/gensec.h"
  32 #include "auth/credentials/credentials.h"
  33 #include "version.h"
  34 #include "param/param.h"
  35 #include "libcli/smb/smbXcli_base.h"
  36
  37 struct sesssetup_state {
  38         struct smbcli_session *session;
  39         union smb_sesssetup setup;
  40         const char *chosen_oid;
  41         NTSTATUS remote_status;
  42         NTSTATUS gensec_status;
  43         struct smb_composite_sesssetup *io;
  44         struct smbcli_request *req;
  45         struct smbcli_request *check_req;
  46         unsigned int logon_retries;
  47 };
  48
  49 static int sesssetup_state_destructor(struct sesssetup_state *state)
  50 {
  51         if (state->req) {
  52                 talloc_free(state->req);
  53                 state->req = NULL;
  54         }
  55
  56         return 0;
  57 }
  58
  59 static NTSTATUS session_setup_old(struct composite_context *c,
  60                                   struct smbcli_session *session,
  61                                   struct smb_composite_sesssetup *io,
  62                                   struct smbcli_request **req);
  63 static NTSTATUS session_setup_nt1(struct composite_context *c,
  64                                   struct smbcli_session *session,
  65                                   struct smb_composite_sesssetup *io,
  66                                   struct smbcli_request **req);
  67 static NTSTATUS session_setup_spnego_restart(struct composite_context *c,
  68                                              struct smbcli_session *session,
  69                                              struct smb_composite_sesssetup *io);
  70 static NTSTATUS session_setup_spnego(struct composite_context *c,
  71                                      struct smbcli_session *session,
  72                                      struct smb_composite_sesssetup *io,
  73                                      struct smbcli_request **req);
  74 static void smb_composite_sesssetup_spnego_done1(struct tevent_req *subreq);
  75 static void smb_composite_sesssetup_spnego_done2(struct tevent_req *subreq);
  76
  77
  78 /*
  79   handler for completion of a smbcli_request sub-request
  80 */
  81 static void request_handler(struct smbcli_request *req)
  82 {
  83         struct composite_context *c = (struct composite_context *)req->async.private_data;
  84         struct sesssetup_state *state = talloc_get_type(c->private_data, struct sesssetup_state);
  85         struct smbcli_session *session = req->session;
  86         DATA_BLOB null_data_blob = data_blob(NULL, 0);
  87         NTSTATUS session_key_err, nt_status;
  88         struct smbcli_request *check_req = NULL;
  89         const char *os = NULL;
  90         const char *lanman = NULL;
  91
  92         if (req->sign_caller_checks) {
  93                 req->do_not_free = true;
  94                 check_req = req;
  95         }
  96
  97         state->remote_status = smb_raw_sesssetup_recv(req, state, &state->setup);
  98         c->status = state->remote_status;
  99         state->req = NULL;
 100
 101         /*
 102          * we only need to check the signature if the
 103          * NT_STATUS_OK is returned
 104          */
 105         if (!NT_STATUS_IS_OK(state->remote_status)) {
 106                 talloc_free(check_req);
 107                 check_req = NULL;
 108         }
 109
 110         switch (state->setup.old.level) {
 111         case RAW_SESSSETUP_OLD:
 112                 state->io->out.vuid = state->setup.old.out.vuid;
 113                 /* This doesn't work, as this only happens on old
 114                  * protocols, where this comparison won't match. */
 115                 if (NT_STATUS_EQUAL(c->status, NT_STATUS_LOGON_FAILURE)) {
 116                         /* we need to reset the vuid for a new try */
 117                         session->vuid = 0;
 118                         if (cli_credentials_wrong_password(state->io->in.credentials)) {
 119                                 nt_status = session_setup_old(c, session,
 120                                                               state->io,
 121                                                               &state->req);
 122                                 if (NT_STATUS_IS_OK(nt_status)) {
 123                                         talloc_free(check_req);
 124                                         c->status = nt_status;
 125                                         composite_continue_smb(c, state->req, request_handler, c);
 126                                         return;
 127                                 }
 128                         }
 129                 }
 130                 if (!NT_STATUS_IS_OK(c->status)) {
 131                         composite_error(c, c->status);
 132                         return;
 133                 }
 134                 os = state->setup.old.out.os;
 135                 lanman = state->setup.old.out.lanman;
 136                 break;
 137
 138         case RAW_SESSSETUP_NT1:
 139                 state->io->out.vuid = state->setup.nt1.out.vuid;
 140                 if (NT_STATUS_EQUAL(c->status, NT_STATUS_LOGON_FAILURE)) {
 141                         /* we need to reset the vuid for a new try */
 142                         session->vuid = 0;
 143                         if (cli_credentials_wrong_password(state->io->in.credentials)) {
 144                                 nt_status = session_setup_nt1(c, session,
 145                                                               state->io,
 146                                                               &state->req);
 147                                 if (NT_STATUS_IS_OK(nt_status)) {
 148                                         talloc_free(check_req);
 149                                         c->status = nt_status;
 150                                         composite_continue_smb(c, state->req, request_handler, c);
 151                                         return;
 152                                 }
 153                         }
 154                 }
 155                 if (!NT_STATUS_IS_OK(c->status)) {
 156                         composite_error(c, c->status);
 157                         return;
 158                 }
 159                 os = state->setup.nt1.out.os;
 160                 lanman = state->setup.nt1.out.lanman;
 161                 break;
 162
 163         case RAW_SESSSETUP_SPNEGO:
 164                 state->io->out.vuid = state->setup.spnego.out.vuid;
 165                 if (NT_STATUS_EQUAL(c->status, NT_STATUS_LOGON_FAILURE)) {
 166                         const char *principal;
 167
 168                         /* we need to reset the vuid for a new try */
 169                         session->vuid = 0;
 170
 171                         principal = gensec_get_target_principal(session->gensec);
 172                         if (principal == NULL) {
 173                                 const char *hostname = gensec_get_target_hostname(session->gensec);
 174                                 const char *service  = gensec_get_target_service(session->gensec);
 175                                 if (hostname != NULL && service != NULL) {
 176                                         principal = talloc_asprintf(state, "%s/%s", service, hostname);
 177                                 }
 178                         }
 179                         if (cli_credentials_failed_kerberos_login(state->io->in.credentials, principal, &state->logon_retries) ||
 180                             cli_credentials_wrong_password(state->io->in.credentials)) {
 181                                 struct tevent_req *subreq = NULL;
 182
 183                                 nt_status = session_setup_spnego_restart(c, session, state->io);
 184                                 if (!NT_STATUS_IS_OK(nt_status)) {
 185                                         DEBUG(1, ("session_setup_spnego_restart() failed: %s\n",
 186                                                   nt_errstr(nt_status)));
 187                                         c->status = nt_status;
 188                                         composite_error(c, c->status);
 189                                         return;
 190                                 }
 191
 192                                 subreq = gensec_update_send(state, c->event_ctx,
 193                                                             session->gensec,
 194                                                             state->setup.spnego.out.secblob);
 195                                 if (composite_nomem(subreq, c)) {
 196                                         return;
 197                                 }
 198                                 tevent_req_set_callback(subreq,
 199                                                         smb_composite_sesssetup_spnego_done1,
 200                                                         c);
 201                                 return;
 202                         }
 203                 }
 204                 if (GENSEC_UPDATE_IS_NTERROR(c->status)) {
 205                         composite_error(c, c->status);
 206                         return;
 207                 }
 208                 if (NT_STATUS_EQUAL(state->gensec_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 209                         struct tevent_req *subreq = NULL;
 210
 211                         /* The status value here, from the earlier pass at GENSEC is
 212                          * vital to the security of the system.  Even if the other end
 213                          * accepts, if GENSEC claims 'MORE_PROCESSING_REQUIRED' then
 214                          * you must keep feeding it blobs, or else the remote
 215                          * host/attacker might avoid mutual authentication
 216                          * requirements */
 217
 218                         subreq = gensec_update_send(state, c->event_ctx,
 219                                                     session->gensec,
 220                                                     state->setup.spnego.out.secblob);
 221                         if (composite_nomem(subreq, c)) {
 222                                 return;
 223                         }
 224                         tevent_req_set_callback(subreq,
 225                                                 smb_composite_sesssetup_spnego_done2,
 226                                                 c);
 227                         if (NT_STATUS_IS_OK(state->remote_status)) {
 228                                 state->check_req = check_req;
 229                         } else {
 230                                 TALLOC_FREE(check_req);
 231                         }
 232                         return;
 233                 } else {
 234                         state->setup.spnego.in.secblob = data_blob(NULL, 0);
 235                 }
 236
 237                 if (cli_credentials_is_anonymous(state->io->in.credentials)) {
 238                         /*
 239                          * anonymous => no signing
 240                          */
 241                 } else if (NT_STATUS_IS_OK(state->remote_status)) {
 242                         DATA_BLOB session_key;
 243
 244                         if (state->setup.spnego.in.secblob.length) {
 245                                 c->status = NT_STATUS_INTERNAL_ERROR;
 246                                 composite_error(c, c->status);
 247                                 return;
 248                         }
 249                         session_key_err = gensec_session_key(session->gensec, session, &session_key);
 250                         if (NT_STATUS_IS_OK(session_key_err)) {
 251                                 smb1cli_conn_activate_signing(session->transport->conn,
 252                                                               session_key,
 253                                                               null_data_blob);
 254                         }
 255
 256                         c->status = smb1cli_session_set_session_key(session->smbXcli,
 257                                                                     session_key);
 258                         data_blob_free(&session_key);
 259                         if (!NT_STATUS_IS_OK(c->status)) {
 260                                 composite_error(c, c->status);
 261                                 return;
 262                         }
 263                 }
 264
 265                 os = state->setup.spnego.out.os;
 266                 lanman = state->setup.spnego.out.lanman;
 267                 break;
 268
 269         case RAW_SESSSETUP_SMB2:
 270                 c->status = NT_STATUS_INTERNAL_ERROR;
 271                 composite_error(c, c->status);
 272                 return;
 273         }
 274
 275         if (check_req) {
 276                 bool ok;
 277
 278                 check_req->sign_caller_checks = false;
 279
 280                 ok = smb1cli_conn_check_signing(check_req->transport->conn,
 281                                                 check_req->in.buffer, 1);
 282                 TALLOC_FREE(check_req);
 283                 if (!ok) {
 284                         c->status = NT_STATUS_ACCESS_DENIED;
 285                         composite_error(c, c->status);
 286                         return;
 287                 }
 288         }
 289
 290         if (!NT_STATUS_IS_OK(c->status)) {
 291                 composite_error(c, c->status);
 292                 return;
 293         }
 294
 295         if (os) {
 296                 session->os = talloc_strdup(session, os);
 297                 if (composite_nomem(session->os, c)) return;
 298         } else {
 299                 session->os = NULL;
 300         }
 301         if (lanman) {
 302                 session->lanman = talloc_strdup(session, lanman);
 303                 if (composite_nomem(session->lanman, c)) return;
 304         } else {
 305                 session->lanman = NULL;
 306         }
 307
 308         composite_done(c);
 309 }
 310
 311
 312 /*
 313   send a nt1 style session setup
 314 */
 315 static NTSTATUS session_setup_nt1(struct composite_context *c,
 316                                   struct smbcli_session *session,
 317                                   struct smb_composite_sesssetup *io,
 318                                   struct smbcli_request **req)
 319 {
 320         NTSTATUS nt_status = NT_STATUS_INTERNAL_ERROR;
 321         struct sesssetup_state *state = talloc_get_type(c->private_data,
 322                                                         struct sesssetup_state);
 323         const char *domain = cli_credentials_get_domain(io->in.credentials);
 324
 325         /*
 326          * domain controllers tend to reject the NTLM v2 blob
 327          * if the netbiosname is not valid (e.g. IP address or FQDN)
 328          * so just leave it away (as Windows client do)
 329          */
 330         DATA_BLOB names_blob = NTLMv2_generate_names_blob(state, NULL, domain);
 331
 332         DATA_BLOB session_key = data_blob(NULL, 0);
 333         int flags = CLI_CRED_NTLM_AUTH;
 334
 335         if (session->options.lanman_auth) {
 336                 flags |= CLI_CRED_LANMAN_AUTH;
 337         }
 338
 339         if (session->options.ntlmv2_auth) {
 340                 flags |= CLI_CRED_NTLMv2_AUTH;
 341         }
 342
 343         state->setup.nt1.level           = RAW_SESSSETUP_NT1;
 344         state->setup.nt1.in.bufsize      = session->transport->options.max_xmit;
 345         state->setup.nt1.in.mpx_max      = session->transport->options.max_mux;
 346         state->setup.nt1.in.vc_num       = 1;
 347         state->setup.nt1.in.sesskey      = io->in.sesskey;
 348         state->setup.nt1.in.capabilities = io->in.capabilities;
 349         state->setup.nt1.in.os           = "Unix";
 350         state->setup.nt1.in.lanman       = talloc_asprintf(state, "Samba %s", SAMBA_VERSION_STRING);
 351
 352         cli_credentials_get_ntlm_username_domain(io->in.credentials, state,
 353                                                  &state->setup.nt1.in.user,
 354                                                  &state->setup.nt1.in.domain);
 355
 356
 357         if (session->transport->negotiate.sec_mode & NEGOTIATE_SECURITY_CHALLENGE_RESPONSE) {
 358                 if (!cli_credentials_is_anonymous(io->in.credentials) &&
 359                     session->options.ntlmv2_auth &&
 360                     session->transport->options.use_spnego)
 361                 {
 362                         /*
 363                          * Don't send an NTLMv2_RESPONSE without NTLMSSP
 364                          * if we want to use spnego
 365                          */
 366                         return NT_STATUS_INVALID_PARAMETER;
 367                 }
 368
 369                 nt_status = cli_credentials_get_ntlm_response(io->in.credentials, state,
 370                                                               &flags,
 371                                                               session->transport->negotiate.secblob,
 372                                                               NULL, /* server_timestamp */
 373                                                               names_blob,
 374                                                               &state->setup.nt1.in.password1,
 375                                                               &state->setup.nt1.in.password2,
 376                                                               NULL, &session_key);
 377                 NT_STATUS_NOT_OK_RETURN(nt_status);
 378         } else if (session->options.plaintext_auth) {
 379                 const char *password = cli_credentials_get_password(io->in.credentials);
 380                 state->setup.nt1.in.password1 = data_blob_talloc(state, password, strlen(password));
 381                 state->setup.nt1.in.password2 = data_blob(NULL, 0);
 382         } else {
 383                 /* could match windows client and return 'cannot logon from this workstation', but it just confuses everybody */
 384                 return NT_STATUS_INVALID_PARAMETER;
 385         }
 386
 387         *req = smb_raw_sesssetup_send(session, &state->setup);
 388         if (!*req) {
 389                 return NT_STATUS_NO_MEMORY;
 390         }
 391
 392         if (!NT_STATUS_IS_OK(nt_status)) {
 393                 /*
 394                  * plain text => no signing
 395                  */
 396                 return (*req)->status;
 397         }
 398
 399         if (cli_credentials_is_anonymous(io->in.credentials)) {
 400                 /*
 401                  * anonymous => no signing
 402                  */
 403                 return (*req)->status;
 404         }
 405
 406         smb1cli_conn_activate_signing(session->transport->conn,
 407                                       session_key,
 408                                       state->setup.nt1.in.password2);
 409
 410         nt_status = smb1cli_session_set_session_key(session->smbXcli,
 411                                                     session_key);
 412         data_blob_free(&session_key);
 413         if (!NT_STATUS_IS_OK(nt_status)) {
 414                 return nt_status;
 415         }
 416
 417         return (*req)->status;
 418 }
 419
 420
 421 /*
 422   old style session setup (pre NT1 protocol level)
 423 */
 424 static NTSTATUS session_setup_old(struct composite_context *c,
 425                                   struct smbcli_session *session,
 426                                   struct smb_composite_sesssetup *io,
 427                                   struct smbcli_request **req)
 428 {
 429         NTSTATUS nt_status;
 430         struct sesssetup_state *state = talloc_get_type(c->private_data,
 431                                                         struct sesssetup_state);
 432         const char *password = cli_credentials_get_password(io->in.credentials);
 433
 434         /*
 435          * domain controllers tend to reject the NTLM v2 blob
 436          * if the netbiosname is not valid (e.g. IP address or FQDN)
 437          * so just leave it away (as Windows client do)
 438          */
 439         DATA_BLOB session_key;
 440
 441         state->setup.old.level      = RAW_SESSSETUP_OLD;
 442         state->setup.old.in.bufsize = session->transport->options.max_xmit;
 443         state->setup.old.in.mpx_max = session->transport->options.max_mux;
 444         state->setup.old.in.vc_num  = 1;
 445         state->setup.old.in.sesskey = io->in.sesskey;
 446         state->setup.old.in.os      = "Unix";
 447         state->setup.old.in.lanman  = talloc_asprintf(state, "Samba %s", SAMBA_VERSION_STRING);
 448         cli_credentials_get_ntlm_username_domain(io->in.credentials, state,
 449                                                  &state->setup.old.in.user,
 450                                                  &state->setup.old.in.domain);
 451
 452         if (session->transport->negotiate.sec_mode & NEGOTIATE_SECURITY_CHALLENGE_RESPONSE) {
 453                 DATA_BLOB names_blob = data_blob_null;
 454                 int flags = 0;
 455
 456                 if (!cli_credentials_is_anonymous(io->in.credentials) &&
 457                     !session->options.lanman_auth)
 458                 {
 459                         return NT_STATUS_INVALID_PARAMETER;
 460                 }
 461
 462                 flags |= CLI_CRED_LANMAN_AUTH;
 463
 464                 nt_status = cli_credentials_get_ntlm_response(io->in.credentials, state,
 465                                                               &flags,
 466                                                               session->transport->negotiate.secblob,
 467                                                               NULL, /* server_timestamp */
 468                                                               names_blob,
 469                                                               &state->setup.old.in.password,
 470                                                               NULL,
 471                                                               NULL, &session_key);
 472                 NT_STATUS_NOT_OK_RETURN(nt_status);
 473
 474                 nt_status = smb1cli_session_set_session_key(session->smbXcli,
 475                                                             session_key);
 476                 data_blob_free(&session_key);
 477                 if (!NT_STATUS_IS_OK(nt_status)) {
 478                         return nt_status;
 479                 }
 480         } else if (session->options.plaintext_auth) {
 481                 state->setup.old.in.password = data_blob_talloc(state, password, strlen(password));
 482         } else {
 483                 /* could match windows client and return 'cannot logon from this workstation', but it just confuses everybody */
 484                 return NT_STATUS_INVALID_PARAMETER;
 485         }
 486
 487         *req = smb_raw_sesssetup_send(session, &state->setup);
 488         if (!*req) {
 489                 return NT_STATUS_NO_MEMORY;
 490         }
 491         return (*req)->status;
 492 }
 493
 494 static NTSTATUS session_setup_spnego_restart(struct composite_context *c,
 495                                              struct smbcli_session *session,
 496                                              struct smb_composite_sesssetup *io)
 497 {
 498         struct sesssetup_state *state = talloc_get_type(c->private_data, struct sesssetup_state);
 499         NTSTATUS status;
 500
 501         status = gensec_client_start(session, &session->gensec,
 502                                      io->in.gensec_settings);
 503         if (!NT_STATUS_IS_OK(status)) {
 504                 DEBUG(1, ("Failed to start GENSEC client mode: %s\n", nt_errstr(status)));
 505                 return status;
 506         }
 507
 508         gensec_want_feature(session->gensec, GENSEC_FEATURE_SESSION_KEY);
 509
 510         status = gensec_set_credentials(session->gensec, io->in.credentials);
 511         if (!NT_STATUS_IS_OK(status)) {
 512                 DEBUG(1, ("Failed to start set GENSEC client credentials: %s\n",
 513                           nt_errstr(status)));
 514                 return status;
 515         }
 516
 517         status = gensec_set_target_hostname(session->gensec,
 518                         smbXcli_conn_remote_name(session->transport->conn));
 519         if (!NT_STATUS_IS_OK(status)) {
 520                 DEBUG(1, ("Failed to start set GENSEC target hostname: %s\n",
 521                           nt_errstr(status)));
 522                 return status;
 523         }
 524
 525         status = gensec_set_target_service(session->gensec, "cifs");
 526         if (!NT_STATUS_IS_OK(status)) {
 527                 DEBUG(1, ("Failed to start set GENSEC target service: %s\n",
 528                           nt_errstr(status)));
 529                 return status;
 530         }
 531
 532         state->setup.spnego.out.secblob =
 533                         session->transport->negotiate.secblob;
 534         if (session->transport->negotiate.secblob.length) {
 535                 state->chosen_oid = GENSEC_OID_SPNEGO;
 536                 status = gensec_start_mech_by_oid(session->gensec,
 537                                                   state->chosen_oid);
 538                 if (!NT_STATUS_IS_OK(status)) {
 539                         DEBUG(1, ("Failed to start set GENSEC client mechanism %s: %s\n",
 540                                   gensec_get_name_by_oid(session->gensec,
 541                                                          state->chosen_oid),
 542                                   nt_errstr(status)));
 543                         state->setup.spnego.out.secblob = data_blob_null;
 544                         state->chosen_oid = GENSEC_OID_NTLMSSP;
 545                         status = gensec_start_mech_by_oid(session->gensec,
 546                                                           state->chosen_oid);
 547                         if (!NT_STATUS_IS_OK(status)) {
 548                                 DEBUG(1, ("Failed to start set (fallback) GENSEC client mechanism %s: %s\n",
 549                                           gensec_get_name_by_oid(session->gensec,
 550                                                                  state->chosen_oid),
 551                                           nt_errstr(status)));
 552                                 return status;
 553                         }
 554                 }
 555         } else {
 556                 /* without a sec blob, means raw NTLMSSP */
 557                 state->chosen_oid = GENSEC_OID_NTLMSSP;
 558                 status = gensec_start_mech_by_oid(session->gensec,
 559                                                   state->chosen_oid);
 560                 if (!NT_STATUS_IS_OK(status)) {
 561                         DEBUG(1, ("Failed to start set GENSEC client mechanism %s: %s\n",
 562                                   gensec_get_name_by_oid(session->gensec,
 563                                                          state->chosen_oid),
 564                                   nt_errstr(status)));
 565                         return status;
 566                 }
 567         }
 568
 569         state->gensec_status = NT_STATUS_MORE_PROCESSING_REQUIRED;
 570         state->remote_status = NT_STATUS_MORE_PROCESSING_REQUIRED;
 571         return NT_STATUS_OK;
 572 }
 573
 574 /*
 575   Modern, all singing, all dancing extended security (and possibly SPNEGO) request
 576 */
 577 static NTSTATUS session_setup_spnego(struct composite_context *c,
 578                                      struct smbcli_session *session,
 579                                      struct smb_composite_sesssetup *io,
 580                                      struct smbcli_request **req)
 581 {
 582         struct sesssetup_state *state = talloc_get_type(c->private_data, struct sesssetup_state);
 583
 584         state->setup.spnego.level           = RAW_SESSSETUP_SPNEGO;
 585         state->setup.spnego.in.bufsize      = session->transport->options.max_xmit;
 586         state->setup.spnego.in.mpx_max      = session->transport->options.max_mux;
 587         state->setup.spnego.in.vc_num       = 1;
 588         state->setup.spnego.in.sesskey      = io->in.sesskey;
 589         state->setup.spnego.in.capabilities = io->in.capabilities;
 590         state->setup.spnego.in.os           = "Unix";
 591         state->setup.spnego.in.lanman       = talloc_asprintf(state, "Samba %s", SAMBA_VERSION_STRING);
 592         state->setup.spnego.in.workgroup    = io->in.workgroup;
 593
 594         *req = smb_raw_sesssetup_send(session, &state->setup);
 595         if (!*req) {
 596                 return NT_STATUS_NO_MEMORY;
 597         }
 598
 599         /*
 600          * we need to check the signature ourself
 601          * as the session key might be the acceptor subkey
 602          * which comes within the response itself
 603          */
 604         if (!smb1cli_conn_signing_is_active((*req)->transport->conn)) {
 605                 (*req)->sign_caller_checks = true;
 606         }
 607
 608         return (*req)->status;
 609 }
 610
 611
 612 /*
 613   composite session setup function that hides the details of all the
 614   different session setup variants, including the multi-pass nature of
 615   the spnego variant
 616 */
 617 struct composite_context *smb_composite_sesssetup_send(struct smbcli_session *session,
 618                                                        struct smb_composite_sesssetup *io)
 619 {
 620         struct composite_context *c;
 621         struct sesssetup_state *state;
 622         NTSTATUS status;
 623         enum smb_encryption_setting encryption_state =
 624                 cli_credentials_get_smb_encryption(io->in.credentials);
 625         enum credentials_use_kerberos krb5_state =
 626                 cli_credentials_get_kerberos_state(io->in.credentials);
 627
 628         c = composite_create(session, session->transport->ev);
 629         if (c == NULL) return NULL;
 630
 631         if (encryption_state > SMB_ENCRYPTION_DESIRED) {
 632                 composite_error(c, NT_STATUS_PROTOCOL_NOT_SUPPORTED);
 633                 return c;
 634         }
 635
 636         state = talloc_zero(c, struct sesssetup_state);
 637         if (composite_nomem(state, c)) return c;
 638         c->private_data = state;
 639
 640         state->session = session;
 641         state->io = io;
 642
 643         talloc_set_destructor(state, sesssetup_state_destructor);
 644
 645         /* no session setup at all in earliest protocol variants */
 646         if (session->transport->negotiate.protocol < PROTOCOL_LANMAN1) {
 647                 if (krb5_state == CRED_USE_KERBEROS_REQUIRED) {
 648                         composite_error(c, NT_STATUS_NETWORK_CREDENTIAL_CONFLICT);
 649                         return c;
 650                 }
 651                 ZERO_STRUCT(io->out);
 652                 composite_done(c);
 653                 return c;
 654         }
 655
 656         /* see what session setup interface we will use */
 657         if (session->transport->negotiate.protocol < PROTOCOL_NT1) {
 658                 if (krb5_state == CRED_USE_KERBEROS_REQUIRED) {
 659                         composite_error(c, NT_STATUS_NETWORK_CREDENTIAL_CONFLICT);
 660                         return c;
 661                 }
 662                 status = session_setup_old(c, session, io, &state->req);
 663         } else if (!session->transport->options.use_spnego ||
 664                    !(io->in.capabilities & CAP_EXTENDED_SECURITY)) {
 665                 if (krb5_state == CRED_USE_KERBEROS_REQUIRED) {
 666                         composite_error(c, NT_STATUS_NETWORK_CREDENTIAL_CONFLICT);
 667                         return c;
 668                 }
 669                 status = session_setup_nt1(c, session, io, &state->req);
 670         } else {
 671                 struct tevent_req *subreq = NULL;
 672
 673                 status = session_setup_spnego_restart(c, session, io);
 674                 if (!NT_STATUS_IS_OK(status)) {
 675                         DEBUG(1, ("session_setup_spnego_restart() failed: %s\n",
 676                                   nt_errstr(status)));
 677                         c->status = status;
 678                         composite_error(c, c->status);
 679                         return c;
 680                 }
 681
 682                 subreq = gensec_update_send(state, c->event_ctx,
 683                                             session->gensec,
 684                                             state->setup.spnego.out.secblob);
 685                 if (composite_nomem(subreq, c)) {
 686                         return c;
 687                 }
 688                 tevent_req_set_callback(subreq,
 689                                         smb_composite_sesssetup_spnego_done1,
 690                                         c);
 691                 return c;
 692         }
 693
 694         if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED) ||
 695             NT_STATUS_IS_OK(status)) {
 696                 composite_continue_smb(c, state->req, request_handler, c);
 697                 return c;
 698         }
 699
 700         composite_error(c, status);
 701         return c;
 702 }
 703
 704 static void smb_composite_sesssetup_spnego_done1(struct tevent_req *subreq)
 705 {
 706         struct composite_context *c =
 707                 tevent_req_callback_data(subreq,
 708                 struct composite_context);
 709         struct sesssetup_state *state =
 710                 talloc_get_type_abort(c->private_data,
 711                 struct sesssetup_state);
 712         NTSTATUS status;
 713
 714         status = gensec_update_recv(subreq, state,
 715                                     &state->setup.spnego.in.secblob);
 716         TALLOC_FREE(subreq);
 717         if (GENSEC_UPDATE_IS_NTERROR(status)) {
 718                 DEBUG(1, ("Failed initial gensec_update with mechanism %s: %s\n",
 719                           gensec_get_name_by_oid(state->session->gensec,
 720                                                  state->chosen_oid),
 721                           nt_errstr(status)));
 722                 c->status = status;
 723                 composite_error(c, c->status);
 724                 return;
 725         }
 726         state->gensec_status = status;
 727
 728         status = session_setup_spnego(c, state->session, state->io, &state->req);
 729         if (!NT_STATUS_IS_OK(status)) {
 730                 c->status = status;
 731                 composite_error(c, c->status);
 732                 return;
 733         }
 734
 735         composite_continue_smb(c, state->req, request_handler, c);
 736 }
 737
 738 static void smb_composite_sesssetup_spnego_done2(struct tevent_req *subreq)
 739 {
 740         struct composite_context *c =
 741                 tevent_req_callback_data(subreq,
 742                 struct composite_context);
 743         struct sesssetup_state *state =
 744                 talloc_get_type_abort(c->private_data,
 745                 struct sesssetup_state);
 746         struct smbcli_session *session = state->session;
 747         NTSTATUS status;
 748         const char *os = NULL;
 749         const char *lanman = NULL;
 750
 751         status = gensec_update_recv(subreq, state,
 752                                     &state->setup.spnego.in.secblob);
 753         TALLOC_FREE(subreq);
 754         if (GENSEC_UPDATE_IS_NTERROR(status)) {
 755                 DEBUG(1, ("Failed initial gensec_update with mechanism %s: %s\n",
 756                           gensec_get_name_by_oid(state->session->gensec,
 757                                                  state->chosen_oid),
 758                           nt_errstr(status)));
 759                 c->status = status;
 760                 composite_error(c, c->status);
 761                 return;
 762         }
 763         state->gensec_status = status;
 764
 765         if (NT_STATUS_IS_OK(state->remote_status)) {
 766                 if (state->setup.spnego.in.secblob.length) {
 767                         c->status = NT_STATUS_INTERNAL_ERROR;
 768                         composite_error(c, c->status);
 769                         return;
 770                 }
 771         }
 772
 773         if (state->setup.spnego.in.secblob.length) {
 774                 /*
 775                  * set the session->vuid value only for calling
 776                  * smb_raw_sesssetup_send()
 777                  */
 778                 uint16_t vuid = session->vuid;
 779                 session->vuid = state->io->out.vuid;
 780                 state->req = smb_raw_sesssetup_send(session, &state->setup);
 781                 session->vuid = vuid;
 782                 if (state->req &&
 783                     !smb1cli_conn_signing_is_active(state->req->transport->conn)) {
 784                         state->req->sign_caller_checks = true;
 785                 }
 786                 composite_continue_smb(c, state->req, request_handler, c);
 787                 return;
 788         }
 789
 790         if (cli_credentials_is_anonymous(state->io->in.credentials)) {
 791                 /*
 792                  * anonymous => no signing
 793                  */
 794         } else if (NT_STATUS_IS_OK(state->remote_status)) {
 795                 NTSTATUS session_key_err;
 796                 DATA_BLOB session_key;
 797
 798                 session_key_err = gensec_session_key(session->gensec, session, &session_key);
 799                 if (NT_STATUS_IS_OK(session_key_err)) {
 800                         smb1cli_conn_activate_signing(session->transport->conn,
 801                                                       session_key,
 802                                                       data_blob_null);
 803                 }
 804
 805                 c->status = smb1cli_session_set_session_key(session->smbXcli,
 806                                                             session_key);
 807                 data_blob_free(&session_key);
 808                 if (!NT_STATUS_IS_OK(c->status)) {
 809                         composite_error(c, c->status);
 810                         return;
 811                 }
 812         }
 813
 814         os = state->setup.spnego.out.os;
 815         lanman = state->setup.spnego.out.lanman;
 816
 817         if (state->check_req) {
 818                 struct smbcli_request *check_req = state->check_req;
 819                 bool ok;
 820
 821                 check_req->sign_caller_checks = false;
 822
 823                 ok = smb1cli_conn_check_signing(check_req->transport->conn,
 824                                                 check_req->in.buffer, 1);
 825                 TALLOC_FREE(check_req);
 826                 if (!ok) {
 827                         c->status = NT_STATUS_ACCESS_DENIED;
 828                         composite_error(c, c->status);
 829                         return;
 830                 }
 831         }
 832
 833         if (os) {
 834                 session->os = talloc_strdup(session, os);
 835                 if (composite_nomem(session->os, c)) return;
 836         } else {
 837                 session->os = NULL;
 838         }
 839         if (lanman) {
 840                 session->lanman = talloc_strdup(session, lanman);
 841                 if (composite_nomem(session->lanman, c)) return;
 842         } else {
 843                 session->lanman = NULL;
 844         }
 845
 846         composite_done(c);
 847 }
 848
 849 /*
 850   receive a composite session setup reply
 851 */
 852 NTSTATUS smb_composite_sesssetup_recv(struct composite_context *c)
 853 {
 854         NTSTATUS status;
 855         status = composite_wait(c);
 856         talloc_free(c);
 857         return status;
 858 }
 859
 860 /*
 861   sync version of smb_composite_sesssetup
 862 */
 863 NTSTATUS smb_composite_sesssetup(struct smbcli_session *session, struct smb_composite_sesssetup *io)
 864 {
 865         struct composite_context *c = smb_composite_sesssetup_send(session, io);
 866         return smb_composite_sesssetup_recv(c);
 867 }