source3/smbd/sesssetup.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    handle SMBsessionsetup
   4    Copyright (C) Andrew Tridgell 1998-2001
   5    Copyright (C) Andrew Bartlett      2001
   6    Copyright (C) Jim McDonough <jmcd@us.ibm.com> 2002
   7    Copyright (C) Luke Howard          2003
   8    Copyright (C) Volker Lendecke      2007
   9    Copyright (C) Jeremy Allison       2007
  10
  11    This program is free software; you can redistribute it and/or modify
  12    it under the terms of the GNU General Public License as published by
  13    the Free Software Foundation; either version 3 of the License, or
  14    (at your option) any later version.
  15
  16    This program is distributed in the hope that it will be useful,
  17    but WITHOUT ANY WARRANTY; without even the implied warranty of
  18    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19    GNU General Public License for more details.
  20
  21    You should have received a copy of the GNU General Public License
  22    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  23 */
  24
  25 #include "includes.h"
  26 #include "smbd/globals.h"
  27 #include "../libcli/auth/spnego.h"
  28 #include "../libcli/auth/ntlmssp.h"
  29 #include "ntlmssp_wrap.h"
  30 #include "librpc/gen_ndr/messaging.h"
  31 #include "../librpc/gen_ndr/krb5pac.h"
  32 #include "libads/kerberos_proto.h"
  33
  34 /* For split krb5 SPNEGO blobs. */
  35 struct pending_auth_data {
  36         struct pending_auth_data *prev, *next;
  37         uint16 vuid; /* Tag for this entry. */
  38         uint16 smbpid; /* Alternate tag for this entry. */
  39         size_t needed_len;
  40         DATA_BLOB partial_data;
  41 };
  42
  43 /*
  44   on a logon error possibly map the error to success if "map to guest"
  45   is set approriately
  46 */
  47 NTSTATUS do_map_to_guest(NTSTATUS status,
  48                         struct auth_serversupplied_info **server_info,
  49                         const char *user, const char *domain)
  50 {
  51         user = user ? user : "";
  52         domain = domain ? domain : "";
  53
  54         if (NT_STATUS_EQUAL(status, NT_STATUS_NO_SUCH_USER)) {
  55                 if ((lp_map_to_guest() == MAP_TO_GUEST_ON_BAD_USER) ||
  56                     (lp_map_to_guest() == MAP_TO_GUEST_ON_BAD_PASSWORD)) {
  57                         DEBUG(3,("No such user %s [%s] - using guest account\n",
  58                                  user, domain));
  59                         status = make_server_info_guest(NULL, server_info);
  60                 }
  61         }
  62
  63         if (NT_STATUS_EQUAL(status, NT_STATUS_WRONG_PASSWORD)) {
  64                 if (lp_map_to_guest() == MAP_TO_GUEST_ON_BAD_PASSWORD) {
  65                         DEBUG(3,("Registered username %s for guest access\n",
  66                                 user));
  67                         status = make_server_info_guest(NULL, server_info);
  68                 }
  69         }
  70
  71         return status;
  72 }
  73
  74 /****************************************************************************
  75  Add the standard 'Samba' signature to the end of the session setup.
  76 ****************************************************************************/
  77
  78 static int push_signature(uint8 **outbuf)
  79 {
  80         char *lanman;
  81         int result, tmp;
  82
  83         result = 0;
  84
  85         tmp = message_push_string(outbuf, "Unix", STR_TERMINATE);
  86
  87         if (tmp == -1) return -1;
  88         result += tmp;
  89
  90         if (asprintf(&lanman, "Samba %s", samba_version_string()) != -1) {
  91                 tmp = message_push_string(outbuf, lanman, STR_TERMINATE);
  92                 SAFE_FREE(lanman);
  93         }
  94         else {
  95                 tmp = message_push_string(outbuf, "Samba", STR_TERMINATE);
  96         }
  97
  98         if (tmp == -1) return -1;
  99         result += tmp;
 100
 101         tmp = message_push_string(outbuf, lp_workgroup(), STR_TERMINATE);
 102
 103         if (tmp == -1) return -1;
 104         result += tmp;
 105
 106         return result;
 107 }
 108
 109 /****************************************************************************
 110  Send a security blob via a session setup reply.
 111 ****************************************************************************/
 112
 113 static void reply_sesssetup_blob(struct smb_request *req,
 114                                  DATA_BLOB blob,
 115                                  NTSTATUS nt_status)
 116 {
 117         if (!NT_STATUS_IS_OK(nt_status) &&
 118             !NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 119                 reply_nterror(req, nt_status_squash(nt_status));
 120                 return;
 121         }
 122
 123         nt_status = nt_status_squash(nt_status);
 124         SIVAL(req->outbuf, smb_rcls, NT_STATUS_V(nt_status));
 125         SSVAL(req->outbuf, smb_vwv0, 0xFF); /* no chaining possible */
 126         SSVAL(req->outbuf, smb_vwv3, blob.length);
 127
 128         if ((message_push_blob(&req->outbuf, blob) == -1)
 129             || (push_signature(&req->outbuf) == -1)) {
 130                 reply_nterror(req, NT_STATUS_NO_MEMORY);
 131         }
 132 }
 133
 134 /****************************************************************************
 135  Do a 'guest' logon, getting back the
 136 ****************************************************************************/
 137
 138 static NTSTATUS check_guest_password(struct auth_serversupplied_info **server_info)
 139 {
 140         struct auth_context *auth_context;
 141         struct auth_usersupplied_info *user_info = NULL;
 142
 143         NTSTATUS nt_status;
 144         unsigned char chal[8];
 145
 146         ZERO_STRUCT(chal);
 147
 148         DEBUG(3,("Got anonymous request\n"));
 149
 150         if (!NT_STATUS_IS_OK(nt_status = make_auth_context_fixed(&auth_context,
 151                                         chal))) {
 152                 return nt_status;
 153         }
 154
 155         if (!make_user_info_guest(&user_info)) {
 156                 TALLOC_FREE(auth_context);
 157                 return NT_STATUS_NO_MEMORY;
 158         }
 159
 160         nt_status = auth_context->check_ntlm_password(auth_context,
 161                                                 user_info,
 162                                                 server_info);
 163         TALLOC_FREE(auth_context);
 164         free_user_info(&user_info);
 165         return nt_status;
 166 }
 167
 168
 169 #ifdef HAVE_KRB5
 170
 171 #if 0
 172 /* Experiment that failed. See "only happens with a KDC" comment below. */
 173 /****************************************************************************
 174  Cerate a clock skew error blob for a Windows client.
 175 ****************************************************************************/
 176
 177 static bool make_krb5_skew_error(DATA_BLOB *pblob_out)
 178 {
 179         krb5_context context = NULL;
 180         krb5_error_code kerr = 0;
 181         krb5_data reply;
 182         krb5_principal host_princ = NULL;
 183         char *host_princ_s = NULL;
 184         bool ret = False;
 185
 186         *pblob_out = data_blob_null;
 187
 188         initialize_krb5_error_table();
 189         kerr = krb5_init_context(&context);
 190         if (kerr) {
 191                 return False;
 192         }
 193         /* Create server principal. */
 194         asprintf(&host_princ_s, "%s$@%s", global_myname(), lp_realm());
 195         if (!host_princ_s) {
 196                 goto out;
 197         }
 198         strlower_m(host_princ_s);
 199
 200         kerr = smb_krb5_parse_name(context, host_princ_s, &host_princ);
 201         if (kerr) {
 202                 DEBUG(10,("make_krb5_skew_error: smb_krb5_parse_name failed "
 203                         "for name %s: Error %s\n",
 204                         host_princ_s, error_message(kerr) ));
 205                 goto out;
 206         }
 207
 208         kerr = smb_krb5_mk_error(context, KRB5KRB_AP_ERR_SKEW,
 209                         host_princ, &reply);
 210         if (kerr) {
 211                 DEBUG(10,("make_krb5_skew_error: smb_krb5_mk_error "
 212                         "failed: Error %s\n",
 213                         error_message(kerr) ));
 214                 goto out;
 215         }
 216
 217         *pblob_out = data_blob(reply.data, reply.length);
 218         kerberos_free_data_contents(context,&reply);
 219         ret = True;
 220
 221   out:
 222
 223         if (host_princ_s) {
 224                 SAFE_FREE(host_princ_s);
 225         }
 226         if (host_princ) {
 227                 krb5_free_principal(context, host_princ);
 228         }
 229         krb5_free_context(context);
 230         return ret;
 231 }
 232 #endif
 233
 234 /****************************************************************************
 235  Reply to a session setup spnego negotiate packet for kerberos.
 236 ****************************************************************************/
 237
 238 static void reply_spnego_kerberos(struct smb_request *req,
 239                                   DATA_BLOB *secblob,
 240                                   const char *mechOID,
 241                                   uint16 vuid,
 242                                   bool *p_invalidate_vuid)
 243 {
 244         TALLOC_CTX *mem_ctx;
 245         DATA_BLOB ticket;
 246         struct passwd *pw;
 247         int sess_vuid = req->vuid;
 248         NTSTATUS ret = NT_STATUS_OK;
 249         DATA_BLOB ap_rep, ap_rep_wrapped, response;
 250         struct auth_serversupplied_info *server_info = NULL;
 251         DATA_BLOB session_key = data_blob_null;
 252         uint8 tok_id[2];
 253         DATA_BLOB nullblob = data_blob_null;
 254         bool map_domainuser_to_guest = False;
 255         bool username_was_mapped;
 256         struct PAC_LOGON_INFO *logon_info = NULL;
 257         struct smbd_server_connection *sconn = req->sconn;
 258         char *principal;
 259         char *user;
 260         char *domain;
 261         char *real_username;
 262
 263         ZERO_STRUCT(ticket);
 264         ZERO_STRUCT(ap_rep);
 265         ZERO_STRUCT(ap_rep_wrapped);
 266         ZERO_STRUCT(response);
 267
 268         /* Normally we will always invalidate the intermediate vuid. */
 269         *p_invalidate_vuid = True;
 270
 271         mem_ctx = talloc_init("reply_spnego_kerberos");
 272         if (mem_ctx == NULL) {
 273                 reply_nterror(req, nt_status_squash(NT_STATUS_NO_MEMORY));
 274                 return;
 275         }
 276
 277         if (!spnego_parse_krb5_wrap(mem_ctx, *secblob, &ticket, tok_id)) {
 278                 talloc_destroy(mem_ctx);
 279                 reply_nterror(req, nt_status_squash(NT_STATUS_LOGON_FAILURE));
 280                 return;
 281         }
 282
 283         ret = ads_verify_ticket(mem_ctx, lp_realm(), 0, &ticket,
 284                                 &principal, &logon_info, &ap_rep,
 285                                 &session_key, True);
 286
 287         data_blob_free(&ticket);
 288
 289         if (!NT_STATUS_IS_OK(ret)) {
 290 #if 0
 291                 /* Experiment that failed.
 292                  * See "only happens with a KDC" comment below. */
 293
 294                 if (NT_STATUS_EQUAL(ret, NT_STATUS_TIME_DIFFERENCE_AT_DC)) {
 295
 296                         /*
 297                          * Windows in this case returns
 298                          * NT_STATUS_MORE_PROCESSING_REQUIRED
 299                          * with a negTokenTarg blob containing an krb5_error
 300                          * struct ASN1 encoded containing KRB5KRB_AP_ERR_SKEW.
 301                          * The client then fixes its clock and continues rather
 302                          * than giving an error. JRA.
 303                          * -- Looks like this only happens with a KDC. JRA.
 304                          */
 305
 306                         bool ok = make_krb5_skew_error(&ap_rep);
 307                         if (!ok) {
 308                                 talloc_destroy(mem_ctx);
 309                                 return ERROR_NT(nt_status_squash(
 310                                                 NT_STATUS_LOGON_FAILURE));
 311                         }
 312                         ap_rep_wrapped = spnego_gen_krb5_wrap(ap_rep,
 313                                         TOK_ID_KRB_ERROR);
 314                         response = spnego_gen_auth_response(&ap_rep_wrapped,
 315                                         ret, OID_KERBEROS5_OLD);
 316                         reply_sesssetup_blob(conn, inbuf, outbuf, response,
 317                                         NT_STATUS_MORE_PROCESSING_REQUIRED);
 318
 319                         /*
 320                          * In this one case we don't invalidate the
 321                          * intermediate vuid as we're expecting the client
 322                          * to re-use it for the next sessionsetupX packet. JRA.
 323                          */
 324
 325                         *p_invalidate_vuid = False;
 326
 327                         data_blob_free(&ap_rep);
 328                         data_blob_free(&ap_rep_wrapped);
 329                         data_blob_free(&response);
 330                         talloc_destroy(mem_ctx);
 331                         return -1; /* already replied */
 332                 }
 333 #else
 334                 if (!NT_STATUS_EQUAL(ret, NT_STATUS_TIME_DIFFERENCE_AT_DC)) {
 335                         ret = NT_STATUS_LOGON_FAILURE;
 336                 }
 337 #endif
 338                 DEBUG(1,("Failed to verify incoming ticket with error %s!\n",
 339                                 nt_errstr(ret)));
 340                 talloc_destroy(mem_ctx);
 341                 reply_nterror(req, nt_status_squash(ret));
 342                 return;
 343         }
 344
 345         ret = get_user_from_kerberos_info(talloc_tos(),
 346                                           sconn->client_id.name,
 347                                           principal, logon_info,
 348                                           &username_was_mapped,
 349                                           &map_domainuser_to_guest,
 350                                           &user, &domain,
 351                                           &real_username, &pw);
 352         if (!NT_STATUS_IS_OK(ret)) {
 353                 data_blob_free(&ap_rep);
 354                 data_blob_free(&session_key);
 355                 talloc_destroy(mem_ctx);
 356                 reply_nterror(req,nt_status_squash(NT_STATUS_LOGON_FAILURE));
 357                 return;
 358         }
 359
 360         /* save the PAC data if we have it */
 361         if (logon_info) {
 362                 netsamlogon_cache_store(user, &logon_info->info3);
 363         }
 364
 365         /* setup the string used by %U */
 366         sub_set_smb_name(real_username);
 367
 368         /* reload services so that the new %U is taken into account */
 369         reload_services(sconn->msg_ctx, sconn->sock, True);
 370
 371         ret = make_server_info_krb5(mem_ctx,
 372                                     user, domain, real_username, pw,
 373                                     logon_info, map_domainuser_to_guest,
 374                                     &server_info);
 375         if (!NT_STATUS_IS_OK(ret)) {
 376                 DEBUG(1, ("make_server_info_krb5 failed!\n"));
 377                 data_blob_free(&ap_rep);
 378                 data_blob_free(&session_key);
 379                 TALLOC_FREE(mem_ctx);
 380                 reply_nterror(req, nt_status_squash(ret));
 381                 return;
 382         }
 383
 384         server_info->nss_token |= username_was_mapped;
 385
 386         /* we need to build the token for the user. make_server_info_guest()
 387            already does this */
 388
 389         if ( !server_info->ptok ) {
 390                 ret = create_local_token( server_info );
 391                 if ( !NT_STATUS_IS_OK(ret) ) {
 392                         DEBUG(10,("failed to create local token: %s\n",
 393                                 nt_errstr(ret)));
 394                         data_blob_free(&ap_rep);
 395                         data_blob_free(&session_key);
 396                         TALLOC_FREE( mem_ctx );
 397                         TALLOC_FREE( server_info );
 398                         reply_nterror(req, nt_status_squash(ret));
 399                         return;
 400                 }
 401         }
 402
 403         if (!is_partial_auth_vuid(sconn, sess_vuid)) {
 404                 sess_vuid = register_initial_vuid(sconn);
 405         }
 406
 407         data_blob_free(&server_info->user_session_key);
 408         /* Set the kerberos-derived session key onto the server_info */
 409         server_info->user_session_key = session_key;
 410         talloc_steal(server_info, session_key.data);
 411
 412         session_key = data_blob_null;
 413
 414         /* register_existing_vuid keeps the server info */
 415         /* register_existing_vuid takes ownership of session_key on success,
 416          * no need to free after this on success. A better interface would copy
 417          * it.... */
 418
 419         sess_vuid = register_existing_vuid(sconn, sess_vuid,
 420                                            server_info, nullblob, user);
 421
 422         reply_outbuf(req, 4, 0);
 423         SSVAL(req->outbuf,smb_uid,sess_vuid);
 424
 425         if (sess_vuid == UID_FIELD_INVALID ) {
 426                 ret = NT_STATUS_LOGON_FAILURE;
 427         } else {
 428                 /* current_user_info is changed on new vuid */
 429                 reload_services(sconn->msg_ctx, sconn->sock, True);
 430
 431                 SSVAL(req->outbuf, smb_vwv3, 0);
 432
 433                 if (server_info->guest) {
 434                         SSVAL(req->outbuf,smb_vwv2,1);
 435                 }
 436
 437                 SSVAL(req->outbuf, smb_uid, sess_vuid);
 438
 439                 /* Successful logon. Keep this vuid. */
 440                 *p_invalidate_vuid = False;
 441         }
 442
 443         /* wrap that up in a nice GSS-API wrapping */
 444         if (NT_STATUS_IS_OK(ret)) {
 445                 ap_rep_wrapped = spnego_gen_krb5_wrap(talloc_tos(), ap_rep,
 446                                 TOK_ID_KRB_AP_REP);
 447         } else {
 448                 ap_rep_wrapped = data_blob_null;
 449         }
 450         response = spnego_gen_auth_response(talloc_tos(), &ap_rep_wrapped, ret,
 451                         mechOID);
 452         reply_sesssetup_blob(req, response, ret);
 453
 454         data_blob_free(&ap_rep);
 455         data_blob_free(&ap_rep_wrapped);
 456         data_blob_free(&response);
 457         TALLOC_FREE(mem_ctx);
 458 }
 459
 460 #endif
 461
 462 /****************************************************************************
 463  Send a session setup reply, wrapped in SPNEGO.
 464  Get vuid and check first.
 465  End the NTLMSSP exchange context if we are OK/complete fail
 466  This should be split into two functions, one to handle each
 467  leg of the NTLM auth steps.
 468 ***************************************************************************/
 469
 470 static void reply_spnego_ntlmssp(struct smb_request *req,
 471                                  uint16 vuid,
 472                                  struct auth_ntlmssp_state **auth_ntlmssp_state,
 473                                  DATA_BLOB *ntlmssp_blob, NTSTATUS nt_status,
 474                                  const char *OID,
 475                                  bool wrap)
 476 {
 477         bool do_invalidate = true;
 478         DATA_BLOB response;
 479         struct auth_serversupplied_info *server_info = NULL;
 480         struct smbd_server_connection *sconn = req->sconn;
 481
 482         if (NT_STATUS_IS_OK(nt_status)) {
 483                 nt_status = auth_ntlmssp_steal_server_info(talloc_tos(),
 484                                         (*auth_ntlmssp_state), &server_info);
 485         } else {
 486                 /* Note that this server_info won't have a session
 487                  * key.  But for map to guest, that's exactly the right
 488                  * thing - we can't reasonably guess the key the
 489                  * client wants, as the password was wrong */
 490                 nt_status = do_map_to_guest(nt_status,
 491                                             &server_info,
 492                                             auth_ntlmssp_get_username(*auth_ntlmssp_state),
 493                                             auth_ntlmssp_get_domain(*auth_ntlmssp_state));
 494         }
 495
 496         reply_outbuf(req, 4, 0);
 497
 498         SSVAL(req->outbuf, smb_uid, vuid);
 499
 500         if (NT_STATUS_IS_OK(nt_status)) {
 501                 DATA_BLOB nullblob = data_blob_null;
 502
 503                 if (!is_partial_auth_vuid(sconn, vuid)) {
 504                         nt_status = NT_STATUS_LOGON_FAILURE;
 505                         goto out;
 506                 }
 507
 508                 /* register_existing_vuid keeps the server info */
 509                 if (register_existing_vuid(sconn, vuid,
 510                                            server_info, nullblob,
 511                                            auth_ntlmssp_get_username(*auth_ntlmssp_state)) !=
 512                                            vuid) {
 513                         /* The problem is, *auth_ntlmssp_state points
 514                          * into the vuser this will have
 515                          * talloc_free()'ed in
 516                          * register_existing_vuid() */
 517                         do_invalidate = false;
 518                         nt_status = NT_STATUS_LOGON_FAILURE;
 519                         goto out;
 520                 }
 521
 522                 /* current_user_info is changed on new vuid */
 523                 reload_services(sconn->msg_ctx, sconn->sock, True);
 524
 525                 SSVAL(req->outbuf, smb_vwv3, 0);
 526
 527                 if (server_info->guest) {
 528                         SSVAL(req->outbuf,smb_vwv2,1);
 529                 }
 530         }
 531
 532   out:
 533
 534         if (wrap) {
 535                 response = spnego_gen_auth_response(talloc_tos(),
 536                                 ntlmssp_blob,
 537                                 nt_status, OID);
 538         } else {
 539                 response = *ntlmssp_blob;
 540         }
 541
 542         reply_sesssetup_blob(req, response, nt_status);
 543         if (wrap) {
 544                 data_blob_free(&response);
 545         }
 546
 547         /* NT_STATUS_MORE_PROCESSING_REQUIRED from our NTLMSSP code tells us,
 548            and the other end, that we are not finished yet. */
 549
 550         if (!NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 551                 /* NB. This is *NOT* an error case. JRA */
 552                 if (do_invalidate) {
 553                         TALLOC_FREE(*auth_ntlmssp_state);
 554                         if (!NT_STATUS_IS_OK(nt_status)) {
 555                                 /* Kill the intermediate vuid */
 556                                 invalidate_vuid(sconn, vuid);
 557                         }
 558                 }
 559         }
 560 }
 561
 562 /****************************************************************************
 563  Is this a krb5 mechanism ?
 564 ****************************************************************************/
 565
 566 NTSTATUS parse_spnego_mechanisms(TALLOC_CTX *ctx,
 567                 DATA_BLOB blob_in,
 568                 DATA_BLOB *pblob_out,
 569                 char **kerb_mechOID)
 570 {
 571         char *OIDs[ASN1_MAX_OIDS];
 572         int i;
 573         NTSTATUS ret = NT_STATUS_OK;
 574
 575         *kerb_mechOID = NULL;
 576
 577         /* parse out the OIDs and the first sec blob */
 578         if (!spnego_parse_negTokenInit(ctx, blob_in, OIDs, NULL, pblob_out) ||
 579                         (OIDs[0] == NULL)) {
 580                 return NT_STATUS_LOGON_FAILURE;
 581         }
 582
 583         /* only look at the first OID for determining the mechToken --
 584            according to RFC2478, we should choose the one we want
 585            and renegotiate, but i smell a client bug here..
 586
 587            Problem observed when connecting to a member (samba box)
 588            of an AD domain as a user in a Samba domain.  Samba member
 589            server sent back krb5/mskrb5/ntlmssp as mechtypes, but the
 590            client (2ksp3) replied with ntlmssp/mskrb5/krb5 and an
 591            NTLMSSP mechtoken.                 --jerry              */
 592
 593 #ifdef HAVE_KRB5
 594         if (strcmp(OID_KERBEROS5, OIDs[0]) == 0 ||
 595             strcmp(OID_KERBEROS5_OLD, OIDs[0]) == 0) {
 596                 *kerb_mechOID = talloc_strdup(ctx, OIDs[0]);
 597                 if (*kerb_mechOID == NULL) {
 598                         ret = NT_STATUS_NO_MEMORY;
 599                 }
 600         }
 601 #endif
 602
 603         for (i=0;OIDs[i];i++) {
 604                 DEBUG(5,("parse_spnego_mechanisms: Got OID %s\n", OIDs[i]));
 605                 talloc_free(OIDs[i]);
 606         }
 607         return ret;
 608 }
 609
 610 /****************************************************************************
 611  Fall back from krb5 to NTLMSSP.
 612 ****************************************************************************/
 613
 614 static void reply_spnego_downgrade_to_ntlmssp(struct smb_request *req,
 615                                                 uint16 vuid)
 616 {
 617         DATA_BLOB response;
 618
 619         reply_outbuf(req, 4, 0);
 620         SSVAL(req->outbuf,smb_uid,vuid);
 621
 622         DEBUG(3,("reply_spnego_downgrade_to_ntlmssp: Got krb5 ticket in SPNEGO "
 623                 "but set to downgrade to NTLMSSP\n"));
 624
 625         response = spnego_gen_auth_response(talloc_tos(), NULL,
 626                         NT_STATUS_MORE_PROCESSING_REQUIRED,
 627                         OID_NTLMSSP);
 628         reply_sesssetup_blob(req, response, NT_STATUS_MORE_PROCESSING_REQUIRED);
 629         data_blob_free(&response);
 630 }
 631
 632 /****************************************************************************
 633  Reply to a session setup spnego negotiate packet.
 634 ****************************************************************************/
 635
 636 static void reply_spnego_negotiate(struct smb_request *req,
 637                                    uint16 vuid,
 638                                    DATA_BLOB blob1,
 639                                    struct auth_ntlmssp_state **auth_ntlmssp_state)
 640 {
 641         DATA_BLOB secblob;
 642         DATA_BLOB chal;
 643         char *kerb_mech = NULL;
 644         NTSTATUS status;
 645         struct smbd_server_connection *sconn = req->sconn;
 646
 647         status = parse_spnego_mechanisms(talloc_tos(),
 648                         blob1, &secblob, &kerb_mech);
 649         if (!NT_STATUS_IS_OK(status)) {
 650                 /* Kill the intermediate vuid */
 651                 invalidate_vuid(sconn, vuid);
 652                 reply_nterror(req, nt_status_squash(status));
 653                 return;
 654         }
 655
 656         DEBUG(3,("reply_spnego_negotiate: Got secblob of size %lu\n",
 657                                 (unsigned long)secblob.length));
 658
 659 #ifdef HAVE_KRB5
 660         if (kerb_mech && ((lp_security()==SEC_ADS) ||
 661                                 USE_KERBEROS_KEYTAB) ) {
 662                 bool destroy_vuid = True;
 663                 reply_spnego_kerberos(req, &secblob, kerb_mech,
 664                                       vuid, &destroy_vuid);
 665                 data_blob_free(&secblob);
 666                 if (destroy_vuid) {
 667                         /* Kill the intermediate vuid */
 668                         invalidate_vuid(sconn, vuid);
 669                 }
 670                 TALLOC_FREE(kerb_mech);
 671                 return;
 672         }
 673 #endif
 674
 675         if (*auth_ntlmssp_state) {
 676                 TALLOC_FREE(*auth_ntlmssp_state);
 677         }
 678
 679         if (kerb_mech) {
 680                 data_blob_free(&secblob);
 681                 /* The mechtoken is a krb5 ticket, but
 682                  * we need to fall back to NTLM. */
 683                 reply_spnego_downgrade_to_ntlmssp(req, vuid);
 684                 TALLOC_FREE(kerb_mech);
 685                 return;
 686         }
 687
 688         status = auth_ntlmssp_start(auth_ntlmssp_state);
 689         if (!NT_STATUS_IS_OK(status)) {
 690                 /* Kill the intermediate vuid */
 691                 invalidate_vuid(sconn, vuid);
 692                 reply_nterror(req, nt_status_squash(status));
 693                 return;
 694         }
 695
 696         status = auth_ntlmssp_update(*auth_ntlmssp_state,
 697                                         secblob, &chal);
 698
 699         data_blob_free(&secblob);
 700
 701         reply_spnego_ntlmssp(req, vuid, auth_ntlmssp_state,
 702                              &chal, status, OID_NTLMSSP, true);
 703
 704         data_blob_free(&chal);
 705
 706         /* already replied */
 707         return;
 708 }
 709
 710 /****************************************************************************
 711  Reply to a session setup spnego auth packet.
 712 ****************************************************************************/
 713
 714 static void reply_spnego_auth(struct smb_request *req,
 715                               uint16 vuid,
 716                               DATA_BLOB blob1,
 717                               struct auth_ntlmssp_state **auth_ntlmssp_state)
 718 {
 719         DATA_BLOB auth = data_blob_null;
 720         DATA_BLOB auth_reply = data_blob_null;
 721         DATA_BLOB secblob = data_blob_null;
 722         NTSTATUS status = NT_STATUS_LOGON_FAILURE;
 723         struct smbd_server_connection *sconn = req->sconn;
 724
 725         if (!spnego_parse_auth(talloc_tos(), blob1, &auth)) {
 726 #if 0
 727                 file_save("auth.dat", blob1.data, blob1.length);
 728 #endif
 729                 /* Kill the intermediate vuid */
 730                 invalidate_vuid(sconn, vuid);
 731
 732                 reply_nterror(req, nt_status_squash(
 733                                       NT_STATUS_LOGON_FAILURE));
 734                 return;
 735         }
 736
 737         if (auth.data[0] == ASN1_APPLICATION(0)) {
 738                 /* Might be a second negTokenTarg packet */
 739                 char *kerb_mech = NULL;
 740
 741                 status = parse_spnego_mechanisms(talloc_tos(),
 742                                 auth, &secblob, &kerb_mech);
 743
 744                 if (!NT_STATUS_IS_OK(status)) {
 745                         /* Kill the intermediate vuid */
 746                         invalidate_vuid(sconn, vuid);
 747                         reply_nterror(req, nt_status_squash(status));
 748                         return;
 749                 }
 750
 751                 DEBUG(3,("reply_spnego_auth: Got secblob of size %lu\n",
 752                                 (unsigned long)secblob.length));
 753 #ifdef HAVE_KRB5
 754                 if (kerb_mech && ((lp_security()==SEC_ADS) ||
 755                                         USE_KERBEROS_KEYTAB)) {
 756                         bool destroy_vuid = True;
 757                         reply_spnego_kerberos(req, &secblob, kerb_mech,
 758                                               vuid, &destroy_vuid);
 759                         data_blob_free(&secblob);
 760                         data_blob_free(&auth);
 761                         if (destroy_vuid) {
 762                                 /* Kill the intermediate vuid */
 763                                 invalidate_vuid(sconn, vuid);
 764                         }
 765                         TALLOC_FREE(kerb_mech);
 766                         return;
 767                 }
 768 #endif
 769                 /* Can't blunder into NTLMSSP auth if we have
 770                  * a krb5 ticket. */
 771
 772                 if (kerb_mech) {
 773                         /* Kill the intermediate vuid */
 774                         invalidate_vuid(sconn, vuid);
 775                         DEBUG(3,("reply_spnego_auth: network "
 776                                 "misconfiguration, client sent us a "
 777                                 "krb5 ticket and kerberos security "
 778                                 "not enabled\n"));
 779                         reply_nterror(req, nt_status_squash(
 780                                         NT_STATUS_LOGON_FAILURE));
 781                         TALLOC_FREE(kerb_mech);
 782                 }
 783         }
 784
 785         /* If we get here it wasn't a negTokenTarg auth packet. */
 786         data_blob_free(&secblob);
 787
 788         if (!*auth_ntlmssp_state) {
 789                 status = auth_ntlmssp_start(auth_ntlmssp_state);
 790                 if (!NT_STATUS_IS_OK(status)) {
 791                         /* Kill the intermediate vuid */
 792                         invalidate_vuid(sconn, vuid);
 793                         reply_nterror(req, nt_status_squash(status));
 794                         return;
 795                 }
 796         }
 797
 798         status = auth_ntlmssp_update(*auth_ntlmssp_state,
 799                                         auth, &auth_reply);
 800
 801         data_blob_free(&auth);
 802
 803         /* Don't send the mechid as we've already sent this (RFC4178). */
 804
 805         reply_spnego_ntlmssp(req, vuid,
 806                              auth_ntlmssp_state,
 807                              &auth_reply, status, NULL, true);
 808
 809         data_blob_free(&auth_reply);
 810
 811         /* and tell smbd that we have already replied to this packet */
 812         return;
 813 }
 814
 815 /****************************************************************************
 816  Delete an entry on the list.
 817 ****************************************************************************/
 818
 819 static void delete_partial_auth(struct smbd_server_connection *sconn,
 820                                 struct pending_auth_data *pad)
 821 {
 822         if (!pad) {
 823                 return;
 824         }
 825         DLIST_REMOVE(sconn->smb1.pd_list, pad);
 826         data_blob_free(&pad->partial_data);
 827         SAFE_FREE(pad);
 828 }
 829
 830 /****************************************************************************
 831  Search for a partial SPNEGO auth fragment matching an smbpid.
 832 ****************************************************************************/
 833
 834 static struct pending_auth_data *get_pending_auth_data(
 835                 struct smbd_server_connection *sconn,
 836                 uint16_t smbpid)
 837 {
 838         struct pending_auth_data *pad;
 839 /*
 840  * NOTE: using the smbpid here is completely wrong...
 841  *       see [MS-SMB]
 842  *       3.3.5.3 Receiving an SMB_COM_SESSION_SETUP_ANDX Request
 843  */
 844         for (pad = sconn->smb1.pd_list; pad; pad = pad->next) {
 845                 if (pad->smbpid == smbpid) {
 846                         break;
 847                 }
 848         }
 849         return pad;
 850 }
 851
 852 /****************************************************************************
 853  Check the size of an SPNEGO blob. If we need more return
 854  NT_STATUS_MORE_PROCESSING_REQUIRED, else return NT_STATUS_OK. Don't allow
 855  the blob to be more than 64k.
 856 ****************************************************************************/
 857
 858 static NTSTATUS check_spnego_blob_complete(struct smbd_server_connection *sconn,
 859                                            uint16 smbpid, uint16 vuid,
 860                                            DATA_BLOB *pblob)
 861 {
 862         struct pending_auth_data *pad = NULL;
 863         ASN1_DATA *data;
 864         size_t needed_len = 0;
 865
 866         pad = get_pending_auth_data(sconn, smbpid);
 867
 868         /* Ensure we have some data. */
 869         if (pblob->length == 0) {
 870                 /* Caller can cope. */
 871                 DEBUG(2,("check_spnego_blob_complete: zero blob length !\n"));
 872                 delete_partial_auth(sconn, pad);
 873                 return NT_STATUS_OK;
 874         }
 875
 876         /* Were we waiting for more data ? */
 877         if (pad) {
 878                 DATA_BLOB tmp_blob;
 879                 size_t copy_len = MIN(65536, pblob->length);
 880
 881                 /* Integer wrap paranoia.... */
 882
 883                 if (pad->partial_data.length + copy_len <
 884                                 pad->partial_data.length ||
 885                     pad->partial_data.length + copy_len < copy_len) {
 886
 887                         DEBUG(2,("check_spnego_blob_complete: integer wrap "
 888                                 "pad->partial_data.length = %u, "
 889                                 "copy_len = %u\n",
 890                                 (unsigned int)pad->partial_data.length,
 891                                 (unsigned int)copy_len ));
 892
 893                         delete_partial_auth(sconn, pad);
 894                         return NT_STATUS_INVALID_PARAMETER;
 895                 }
 896
 897                 DEBUG(10,("check_spnego_blob_complete: "
 898                         "pad->partial_data.length = %u, "
 899                         "pad->needed_len = %u, "
 900                         "copy_len = %u, "
 901                         "pblob->length = %u,\n",
 902                         (unsigned int)pad->partial_data.length,
 903                         (unsigned int)pad->needed_len,
 904                         (unsigned int)copy_len,
 905                         (unsigned int)pblob->length ));
 906
 907                 tmp_blob = data_blob(NULL,
 908                                 pad->partial_data.length + copy_len);
 909
 910                 /* Concatenate the two (up to copy_len) bytes. */
 911                 memcpy(tmp_blob.data,
 912                         pad->partial_data.data,
 913                         pad->partial_data.length);
 914                 memcpy(tmp_blob.data + pad->partial_data.length,
 915                         pblob->data,
 916                         copy_len);
 917
 918                 /* Replace the partial data. */
 919                 data_blob_free(&pad->partial_data);
 920                 pad->partial_data = tmp_blob;
 921                 ZERO_STRUCT(tmp_blob);
 922
 923                 /* Are we done ? */
 924                 if (pblob->length >= pad->needed_len) {
 925                         /* Yes, replace pblob. */
 926                         data_blob_free(pblob);
 927                         *pblob = pad->partial_data;
 928                         ZERO_STRUCT(pad->partial_data);
 929                         delete_partial_auth(sconn, pad);
 930                         return NT_STATUS_OK;
 931                 }
 932
 933                 /* Still need more data. */
 934                 pad->needed_len -= copy_len;
 935                 return NT_STATUS_MORE_PROCESSING_REQUIRED;
 936         }
 937
 938         if ((pblob->data[0] != ASN1_APPLICATION(0)) &&
 939             (pblob->data[0] != ASN1_CONTEXT(1))) {
 940                 /* Not something we can determine the
 941                  * length of.
 942                  */
 943                 return NT_STATUS_OK;
 944         }
 945
 946         /* This is a new SPNEGO sessionsetup - see if
 947          * the data given in this blob is enough.
 948          */
 949
 950         data = asn1_init(NULL);
 951         if (data == NULL) {
 952                 return NT_STATUS_NO_MEMORY;
 953         }
 954
 955         asn1_load(data, *pblob);
 956         asn1_start_tag(data, pblob->data[0]);
 957         if (data->has_error || data->nesting == NULL) {
 958                 asn1_free(data);
 959                 /* Let caller catch. */
 960                 return NT_STATUS_OK;
 961         }
 962
 963         /* Integer wrap paranoia.... */
 964
 965         if (data->nesting->taglen + data->nesting->start < data->nesting->taglen ||
 966             data->nesting->taglen + data->nesting->start < data->nesting->start) {
 967
 968                 DEBUG(2,("check_spnego_blob_complete: integer wrap "
 969                         "data.nesting->taglen = %u, "
 970                         "data.nesting->start = %u\n",
 971                         (unsigned int)data->nesting->taglen,
 972                         (unsigned int)data->nesting->start ));
 973
 974                 asn1_free(data);
 975                 return NT_STATUS_INVALID_PARAMETER;
 976         }
 977
 978         /* Total length of the needed asn1 is the tag length
 979          * plus the current offset. */
 980
 981         needed_len = data->nesting->taglen + data->nesting->start;
 982         asn1_free(data);
 983
 984         DEBUG(10,("check_spnego_blob_complete: needed_len = %u, "
 985                 "pblob->length = %u\n",
 986                 (unsigned int)needed_len,
 987                 (unsigned int)pblob->length ));
 988
 989         if (needed_len <= pblob->length) {
 990                 /* Nothing to do - blob is complete. */
 991                 return NT_STATUS_OK;
 992         }
 993
 994         /* Refuse the blob if it's bigger than 64k. */
 995         if (needed_len > 65536) {
 996                 DEBUG(2,("check_spnego_blob_complete: needed_len "
 997                         "too large (%u)\n",
 998                         (unsigned int)needed_len ));
 999                 return NT_STATUS_INVALID_PARAMETER;
1000         }
1001
1002         /* We must store this blob until complete. */
1003         if (!(pad = SMB_MALLOC_P(struct pending_auth_data))) {
1004                 return NT_STATUS_NO_MEMORY;
1005         }
1006         pad->needed_len = needed_len - pblob->length;
1007         pad->partial_data = data_blob(pblob->data, pblob->length);
1008         if (pad->partial_data.data == NULL) {
1009                 SAFE_FREE(pad);
1010                 return NT_STATUS_NO_MEMORY;
1011         }
1012         pad->smbpid = smbpid;
1013         pad->vuid = vuid;
1014         DLIST_ADD(sconn->smb1.pd_list, pad);
1015
1016         return NT_STATUS_MORE_PROCESSING_REQUIRED;
1017 }
1018
1019 /****************************************************************************
1020  Reply to a session setup command.
1021  conn POINTER CAN BE NULL HERE !
1022 ****************************************************************************/
1023
1024 static void reply_sesssetup_and_X_spnego(struct smb_request *req)
1025 {
1026         const uint8 *p;
1027         DATA_BLOB blob1;
1028         size_t bufrem;
1029         char *tmp;
1030         const char *native_os;
1031         const char *native_lanman;
1032         const char *primary_domain;
1033         const char *p2;
1034         uint16 data_blob_len = SVAL(req->vwv+7, 0);
1035         enum remote_arch_types ra_type = get_remote_arch();
1036         int vuid = req->vuid;
1037         user_struct *vuser = NULL;
1038         NTSTATUS status = NT_STATUS_OK;
1039         uint16 smbpid = req->smbpid;
1040         struct smbd_server_connection *sconn = req->sconn;
1041
1042         DEBUG(3,("Doing spnego session setup\n"));
1043
1044         if (global_client_caps == 0) {
1045                 global_client_caps = IVAL(req->vwv+10, 0);
1046
1047                 if (!(global_client_caps & CAP_STATUS32)) {
1048                         remove_from_common_flags2(FLAGS2_32_BIT_ERROR_CODES);
1049                 }
1050
1051         }
1052
1053         p = req->buf;
1054
1055         if (data_blob_len == 0) {
1056                 /* an invalid request */
1057                 reply_nterror(req, nt_status_squash(NT_STATUS_LOGON_FAILURE));
1058                 return;
1059         }
1060
1061         bufrem = smbreq_bufrem(req, p);
1062         /* pull the spnego blob */
1063         blob1 = data_blob(p, MIN(bufrem, data_blob_len));
1064
1065 #if 0
1066         file_save("negotiate.dat", blob1.data, blob1.length);
1067 #endif
1068
1069         p2 = (char *)req->buf + blob1.length;
1070
1071         p2 += srvstr_pull_req_talloc(talloc_tos(), req, &tmp, p2,
1072                                      STR_TERMINATE);
1073         native_os = tmp ? tmp : "";
1074
1075         p2 += srvstr_pull_req_talloc(talloc_tos(), req, &tmp, p2,
1076                                      STR_TERMINATE);
1077         native_lanman = tmp ? tmp : "";
1078
1079         p2 += srvstr_pull_req_talloc(talloc_tos(), req, &tmp, p2,
1080                                      STR_TERMINATE);
1081         primary_domain = tmp ? tmp : "";
1082
1083         DEBUG(3,("NativeOS=[%s] NativeLanMan=[%s] PrimaryDomain=[%s]\n",
1084                 native_os, native_lanman, primary_domain));
1085
1086         if ( ra_type == RA_WIN2K ) {
1087                 /* Vista sets neither the OS or lanman strings */
1088
1089                 if ( !strlen(native_os) && !strlen(native_lanman) )
1090                         set_remote_arch(RA_VISTA);
1091
1092                 /* Windows 2003 doesn't set the native lanman string,
1093                    but does set primary domain which is a bug I think */
1094
1095                 if ( !strlen(native_lanman) ) {
1096                         ra_lanman_string( primary_domain );
1097                 } else {
1098                         ra_lanman_string( native_lanman );
1099                 }
1100         }
1101
1102         /* Did we get a valid vuid ? */
1103         if (!is_partial_auth_vuid(sconn, vuid)) {
1104                 /* No, then try and see if this is an intermediate sessionsetup
1105                  * for a large SPNEGO packet. */
1106                 struct pending_auth_data *pad;
1107                 pad = get_pending_auth_data(sconn, smbpid);
1108                 if (pad) {
1109                         DEBUG(10,("reply_sesssetup_and_X_spnego: found "
1110                                 "pending vuid %u\n",
1111                                 (unsigned int)pad->vuid ));
1112                         vuid = pad->vuid;
1113                 }
1114         }
1115
1116         /* Do we have a valid vuid now ? */
1117         if (!is_partial_auth_vuid(sconn, vuid)) {
1118                 /* No, start a new authentication setup. */
1119                 vuid = register_initial_vuid(sconn);
1120                 if (vuid == UID_FIELD_INVALID) {
1121                         data_blob_free(&blob1);
1122                         reply_nterror(req, nt_status_squash(
1123                                               NT_STATUS_INVALID_PARAMETER));
1124                         return;
1125                 }
1126         }
1127
1128         vuser = get_partial_auth_user_struct(sconn, vuid);
1129         /* This MUST be valid. */
1130         if (!vuser) {
1131                 smb_panic("reply_sesssetup_and_X_spnego: invalid vuid.");
1132         }
1133
1134         /* Large (greater than 4k) SPNEGO blobs are split into multiple
1135          * sessionsetup requests as the Windows limit on the security blob
1136          * field is 4k. Bug #4400. JRA.
1137          */
1138
1139         status = check_spnego_blob_complete(sconn, smbpid, vuid, &blob1);
1140         if (!NT_STATUS_IS_OK(status)) {
1141                 if (!NT_STATUS_EQUAL(status,
1142                                 NT_STATUS_MORE_PROCESSING_REQUIRED)) {
1143                         /* Real error - kill the intermediate vuid */
1144                         invalidate_vuid(sconn, vuid);
1145                 }
1146                 data_blob_free(&blob1);
1147                 reply_nterror(req, nt_status_squash(status));
1148                 return;
1149         }
1150
1151         if (blob1.data[0] == ASN1_APPLICATION(0)) {
1152
1153                 /* its a negTokenTarg packet */
1154
1155                 reply_spnego_negotiate(req, vuid, blob1,
1156                                        &vuser->auth_ntlmssp_state);
1157                 data_blob_free(&blob1);
1158                 return;
1159         }
1160
1161         if (blob1.data[0] == ASN1_CONTEXT(1)) {
1162
1163                 /* its a auth packet */
1164
1165                 reply_spnego_auth(req, vuid, blob1,
1166                                   &vuser->auth_ntlmssp_state);
1167                 data_blob_free(&blob1);
1168                 return;
1169         }
1170
1171         if (strncmp((char *)(blob1.data), "NTLMSSP", 7) == 0) {
1172                 DATA_BLOB chal;
1173
1174                 if (!vuser->auth_ntlmssp_state) {
1175                         status = auth_ntlmssp_start(&vuser->auth_ntlmssp_state);
1176                         if (!NT_STATUS_IS_OK(status)) {
1177                                 /* Kill the intermediate vuid */
1178                                 invalidate_vuid(sconn, vuid);
1179                                 data_blob_free(&blob1);
1180                                 reply_nterror(req, nt_status_squash(status));
1181                                 return;
1182                         }
1183                 }
1184
1185                 status = auth_ntlmssp_update(vuser->auth_ntlmssp_state,
1186                                                 blob1, &chal);
1187
1188                 data_blob_free(&blob1);
1189
1190                 reply_spnego_ntlmssp(req, vuid,
1191                                      &vuser->auth_ntlmssp_state,
1192                                      &chal, status, OID_NTLMSSP, false);
1193                 data_blob_free(&chal);
1194                 return;
1195         }
1196
1197         /* what sort of packet is this? */
1198         DEBUG(1,("Unknown packet in reply_sesssetup_and_X_spnego\n"));
1199
1200         data_blob_free(&blob1);
1201
1202         reply_nterror(req, nt_status_squash(NT_STATUS_LOGON_FAILURE));
1203 }
1204
1205 /****************************************************************************
1206  On new VC == 0, shutdown *all* old connections and users.
1207  It seems that only NT4.x does this. At W2K and above (XP etc.).
1208  a new session setup with VC==0 is ignored.
1209 ****************************************************************************/
1210
1211 struct shutdown_state {
1212         const char *ip;
1213         struct messaging_context *msg_ctx;
1214 };
1215
1216 static int shutdown_other_smbds(const struct connections_key *key,
1217                                 const struct connections_data *crec,
1218                                 void *private_data)
1219 {
1220         struct shutdown_state *state = (struct shutdown_state *)private_data;
1221
1222         DEBUG(10, ("shutdown_other_smbds: %s, %s\n",
1223                    procid_str(talloc_tos(), &crec->pid), crec->addr));
1224
1225         if (!process_exists(crec->pid)) {
1226                 DEBUG(10, ("process does not exist\n"));
1227                 return 0;
1228         }
1229
1230         if (procid_is_me(&crec->pid)) {
1231                 DEBUG(10, ("It's me\n"));
1232                 return 0;
1233         }
1234
1235         if (strcmp(state->ip, crec->addr) != 0) {
1236                 DEBUG(10, ("%s does not match %s\n", state->ip, crec->addr));
1237                 return 0;
1238         }
1239
1240         DEBUG(1, ("shutdown_other_smbds: shutting down pid %u "
1241                   "(IP %s)\n", (unsigned int)procid_to_pid(&crec->pid),
1242                   state->ip));
1243
1244         messaging_send(state->msg_ctx, crec->pid, MSG_SHUTDOWN,
1245                        &data_blob_null);
1246         return 0;
1247 }
1248
1249 static void setup_new_vc_session(struct smbd_server_connection *sconn)
1250 {
1251         DEBUG(2,("setup_new_vc_session: New VC == 0, if NT4.x "
1252                 "compatible we would close all old resources.\n"));
1253 #if 0
1254         conn_close_all();
1255         invalidate_all_vuids();
1256 #endif
1257         if (lp_reset_on_zero_vc()) {
1258                 char *addr;
1259                 struct shutdown_state state;
1260
1261                 addr = tsocket_address_inet_addr_string(
1262                         sconn->remote_address, talloc_tos());
1263                 if (addr == NULL) {
1264                         return;
1265                 }
1266                 state.ip = addr;
1267                 state.msg_ctx = sconn->msg_ctx;
1268                 connections_forall_read(shutdown_other_smbds, &state);
1269                 TALLOC_FREE(addr);
1270         }
1271 }
1272
1273 /****************************************************************************
1274  Reply to a session setup command.
1275 ****************************************************************************/
1276
1277 void reply_sesssetup_and_X(struct smb_request *req)
1278 {
1279         int sess_vuid;
1280         int smb_bufsize;
1281         DATA_BLOB lm_resp;
1282         DATA_BLOB nt_resp;
1283         DATA_BLOB plaintext_password;
1284         char *tmp;
1285         const char *user;
1286         fstring sub_user; /* Sanitised username for substituion */
1287         const char *domain;
1288         const char *native_os;
1289         const char *native_lanman;
1290         const char *primary_domain;
1291         struct auth_usersupplied_info *user_info = NULL;
1292         struct auth_serversupplied_info *server_info = NULL;
1293         uint16 smb_flag2 = req->flags2;
1294
1295         NTSTATUS nt_status;
1296         struct smbd_server_connection *sconn = req->sconn;
1297
1298         bool doencrypt = sconn->smb1.negprot.encrypted_passwords;
1299
1300         START_PROFILE(SMBsesssetupX);
1301
1302         ZERO_STRUCT(lm_resp);
1303         ZERO_STRUCT(nt_resp);
1304         ZERO_STRUCT(plaintext_password);
1305
1306         DEBUG(3,("wct=%d flg2=0x%x\n", req->wct, req->flags2));
1307
1308         /* a SPNEGO session setup has 12 command words, whereas a normal
1309            NT1 session setup has 13. See the cifs spec. */
1310         if (req->wct == 12 &&
1311             (req->flags2 & FLAGS2_EXTENDED_SECURITY)) {
1312
1313                 if (!sconn->smb1.negprot.spnego) {
1314                         DEBUG(0,("reply_sesssetup_and_X:  Rejecting attempt "
1315                                  "at SPNEGO session setup when it was not "
1316                                  "negotiated.\n"));
1317                         reply_nterror(req, nt_status_squash(
1318                                               NT_STATUS_LOGON_FAILURE));
1319                         END_PROFILE(SMBsesssetupX);
1320                         return;
1321                 }
1322
1323                 if (SVAL(req->vwv+4, 0) == 0) {
1324                         setup_new_vc_session(req->sconn);
1325                 }
1326
1327                 reply_sesssetup_and_X_spnego(req);
1328                 END_PROFILE(SMBsesssetupX);
1329                 return;
1330         }
1331
1332         smb_bufsize = SVAL(req->vwv+2, 0);
1333
1334         if (get_Protocol() < PROTOCOL_NT1) {
1335                 uint16 passlen1 = SVAL(req->vwv+7, 0);
1336
1337                 /* Never do NT status codes with protocols before NT1 as we
1338                  * don't get client caps. */
1339                 remove_from_common_flags2(FLAGS2_32_BIT_ERROR_CODES);
1340
1341                 if ((passlen1 > MAX_PASS_LEN) || (passlen1 > req->buflen)) {
1342                         reply_nterror(req, nt_status_squash(
1343                                               NT_STATUS_INVALID_PARAMETER));
1344                         END_PROFILE(SMBsesssetupX);
1345                         return;
1346                 }
1347
1348                 if (doencrypt) {
1349                         lm_resp = data_blob(req->buf, passlen1);
1350                 } else {
1351                         plaintext_password = data_blob(req->buf, passlen1+1);
1352                         /* Ensure null termination */
1353                         plaintext_password.data[passlen1] = 0;
1354                 }
1355
1356                 srvstr_pull_req_talloc(talloc_tos(), req, &tmp,
1357                                        req->buf + passlen1, STR_TERMINATE);
1358                 user = tmp ? tmp : "";
1359
1360                 domain = "";
1361
1362         } else {
1363                 uint16 passlen1 = SVAL(req->vwv+7, 0);
1364                 uint16 passlen2 = SVAL(req->vwv+8, 0);
1365                 enum remote_arch_types ra_type = get_remote_arch();
1366                 const uint8_t *p = req->buf;
1367                 const uint8_t *save_p = req->buf;
1368                 uint16 byte_count;
1369
1370
1371                 if(global_client_caps == 0) {
1372                         global_client_caps = IVAL(req->vwv+11, 0);
1373
1374                         if (!(global_client_caps & CAP_STATUS32)) {
1375                                 remove_from_common_flags2(
1376                                                 FLAGS2_32_BIT_ERROR_CODES);
1377                         }
1378
1379                         /* client_caps is used as final determination if
1380                          * client is NT or Win95. This is needed to return
1381                          * the correct error codes in some circumstances.
1382                         */
1383
1384                         if(ra_type == RA_WINNT || ra_type == RA_WIN2K ||
1385                                         ra_type == RA_WIN95) {
1386                                 if(!(global_client_caps & (CAP_NT_SMBS|
1387                                                         CAP_STATUS32))) {
1388                                         set_remote_arch( RA_WIN95);
1389                                 }
1390                         }
1391                 }
1392
1393                 if (!doencrypt) {
1394                         /* both Win95 and WinNT stuff up the password
1395                          * lengths for non-encrypting systems. Uggh.
1396
1397                            if passlen1==24 its a win95 system, and its setting
1398                            the password length incorrectly. Luckily it still
1399                            works with the default code because Win95 will null
1400                            terminate the password anyway
1401
1402                            if passlen1>0 and passlen2>0 then maybe its a NT box
1403                            and its setting passlen2 to some random value which
1404                            really stuffs things up. we need to fix that one.  */
1405
1406                         if (passlen1 > 0 && passlen2 > 0 && passlen2 != 24 &&
1407                                         passlen2 != 1) {
1408                                 passlen2 = 0;
1409                         }
1410                 }
1411
1412                 /* check for nasty tricks */
1413                 if (passlen1 > MAX_PASS_LEN
1414                     || passlen1 > smbreq_bufrem(req, p)) {
1415                         reply_nterror(req, nt_status_squash(
1416                                               NT_STATUS_INVALID_PARAMETER));
1417                         END_PROFILE(SMBsesssetupX);
1418                         return;
1419                 }
1420
1421                 if (passlen2 > MAX_PASS_LEN
1422                     || passlen2 > smbreq_bufrem(req, p+passlen1)) {
1423                         reply_nterror(req, nt_status_squash(
1424                                               NT_STATUS_INVALID_PARAMETER));
1425                         END_PROFILE(SMBsesssetupX);
1426                         return;
1427                 }
1428
1429                 /* Save the lanman2 password and the NT md4 password. */
1430
1431                 if ((doencrypt) && (passlen1 != 0) && (passlen1 != 24)) {
1432                         doencrypt = False;
1433                 }
1434
1435                 if (doencrypt) {
1436                         lm_resp = data_blob(p, passlen1);
1437                         nt_resp = data_blob(p+passlen1, passlen2);
1438                 } else if (lp_security() != SEC_SHARE) {
1439                         /*
1440                          * In share level we should ignore any passwords, so
1441                          * only read them if we're not.
1442                          */
1443                         char *pass = NULL;
1444                         bool unic= smb_flag2 & FLAGS2_UNICODE_STRINGS;
1445
1446                         if (unic && (passlen2 == 0) && passlen1) {
1447                                 /* Only a ascii plaintext password was sent. */
1448                                 (void)srvstr_pull_talloc(talloc_tos(),
1449                                                         req->inbuf,
1450                                                         req->flags2,
1451                                                         &pass,
1452                                                         req->buf,
1453                                                         passlen1,
1454                                                         STR_TERMINATE|STR_ASCII);
1455                         } else {
1456                                 (void)srvstr_pull_talloc(talloc_tos(),
1457                                                         req->inbuf,
1458                                                         req->flags2,
1459                                                         &pass,
1460                                                         req->buf,
1461                                                         unic ? passlen2 : passlen1,
1462                                                         STR_TERMINATE);
1463                         }
1464                         if (!pass) {
1465                                 reply_nterror(req, nt_status_squash(
1466                                               NT_STATUS_INVALID_PARAMETER));
1467                                 END_PROFILE(SMBsesssetupX);
1468                                 return;
1469                         }
1470                         plaintext_password = data_blob(pass, strlen(pass)+1);
1471                 }
1472
1473                 p += passlen1 + passlen2;
1474
1475                 p += srvstr_pull_req_talloc(talloc_tos(), req, &tmp, p,
1476                                             STR_TERMINATE);
1477                 user = tmp ? tmp : "";
1478
1479                 p += srvstr_pull_req_talloc(talloc_tos(), req, &tmp, p,
1480                                             STR_TERMINATE);
1481                 domain = tmp ? tmp : "";
1482
1483                 p += srvstr_pull_req_talloc(talloc_tos(), req, &tmp, p,
1484                                             STR_TERMINATE);
1485                 native_os = tmp ? tmp : "";
1486
1487                 p += srvstr_pull_req_talloc(talloc_tos(), req, &tmp, p,
1488                                             STR_TERMINATE);
1489                 native_lanman = tmp ? tmp : "";
1490
1491                 /* not documented or decoded by Ethereal but there is one more
1492                  * string in the extra bytes which is the same as the
1493                  * PrimaryDomain when using extended security.  Windows NT 4
1494                  * and 2003 use this string to store the native lanman string.
1495                  * Windows 9x does not include a string here at all so we have
1496                  * to check if we have any extra bytes left */
1497
1498                 byte_count = SVAL(req->vwv+13, 0);
1499                 if ( PTR_DIFF(p, save_p) < byte_count) {
1500                         p += srvstr_pull_req_talloc(talloc_tos(), req, &tmp, p,
1501                                                     STR_TERMINATE);
1502                         primary_domain = tmp ? tmp : "";
1503                 } else {
1504                         primary_domain = talloc_strdup(talloc_tos(), "null");
1505                 }
1506
1507                 DEBUG(3,("Domain=[%s]  NativeOS=[%s] NativeLanMan=[%s] "
1508                         "PrimaryDomain=[%s]\n",
1509                         domain, native_os, native_lanman, primary_domain));
1510
1511                 if ( ra_type == RA_WIN2K ) {
1512                         if ( strlen(native_lanman) == 0 )
1513                                 ra_lanman_string( primary_domain );
1514                         else
1515                                 ra_lanman_string( native_lanman );
1516                 }
1517
1518         }
1519
1520         if (SVAL(req->vwv+4, 0) == 0) {
1521                 setup_new_vc_session(req->sconn);
1522         }
1523
1524         DEBUG(3,("sesssetupX:name=[%s]\\[%s]@[%s]\n",
1525                                 domain, user, get_remote_machine_name()));
1526
1527         if (*user) {
1528                 if (sconn->smb1.negprot.spnego) {
1529
1530                         /* This has to be here, because this is a perfectly
1531                          * valid behaviour for guest logons :-( */
1532
1533                         DEBUG(0,("reply_sesssetup_and_X:  Rejecting attempt "
1534                                 "at 'normal' session setup after "
1535                                 "negotiating spnego.\n"));
1536                         reply_nterror(req, nt_status_squash(
1537                                               NT_STATUS_LOGON_FAILURE));
1538                         END_PROFILE(SMBsesssetupX);
1539                         return;
1540                 }
1541                 fstrcpy(sub_user, user);
1542         } else {
1543                 fstrcpy(sub_user, lp_guestaccount());
1544         }
1545
1546         sub_set_smb_name(sub_user);
1547
1548         reload_services(sconn->msg_ctx, sconn->sock, True);
1549
1550         if (lp_security() == SEC_SHARE) {
1551                 /* In share level we should ignore any passwords */
1552
1553                 data_blob_free(&lm_resp);
1554                 data_blob_free(&nt_resp);
1555                 data_blob_clear_free(&plaintext_password);
1556
1557                 map_username(sub_user);
1558                 add_session_user(sconn, sub_user);
1559                 add_session_workgroup(sconn, domain);
1560                 /* Then force it to null for the benfit of the code below */
1561                 user = "";
1562         }
1563
1564         if (!*user) {
1565
1566                 nt_status = check_guest_password(&server_info);
1567
1568         } else if (doencrypt) {
1569                 struct auth_context *negprot_auth_context = NULL;
1570                 negprot_auth_context = sconn->smb1.negprot.auth_context;
1571                 if (!negprot_auth_context) {
1572                         DEBUG(0, ("reply_sesssetup_and_X:  Attempted encrypted "
1573                                 "session setup without negprot denied!\n"));
1574                         reply_nterror(req, nt_status_squash(
1575                                               NT_STATUS_LOGON_FAILURE));
1576                         END_PROFILE(SMBsesssetupX);
1577                         return;
1578                 }
1579                 nt_status = make_user_info_for_reply_enc(&user_info, user,
1580                                                 domain,
1581                                                 lm_resp, nt_resp);
1582                 if (NT_STATUS_IS_OK(nt_status)) {
1583                         nt_status = negprot_auth_context->check_ntlm_password(
1584                                         negprot_auth_context,
1585                                         user_info,
1586                                         &server_info);
1587                 }
1588         } else {
1589                 struct auth_context *plaintext_auth_context = NULL;
1590
1591                 nt_status = make_auth_context_subsystem(
1592                                 &plaintext_auth_context);
1593
1594                 if (NT_STATUS_IS_OK(nt_status)) {
1595                         uint8_t chal[8];
1596
1597                         plaintext_auth_context->get_ntlm_challenge(
1598                                         plaintext_auth_context, chal);
1599
1600                         if (!make_user_info_for_reply(&user_info,
1601                                                       user, domain, chal,
1602                                                       plaintext_password)) {
1603                                 nt_status = NT_STATUS_NO_MEMORY;
1604                         }
1605
1606                         if (NT_STATUS_IS_OK(nt_status)) {
1607                                 nt_status = plaintext_auth_context->check_ntlm_password(
1608                                                 plaintext_auth_context,
1609                                                 user_info,
1610                                                 &server_info);
1611
1612                                 TALLOC_FREE(plaintext_auth_context);
1613                         }
1614                 }
1615         }
1616
1617         free_user_info(&user_info);
1618
1619         if (!NT_STATUS_IS_OK(nt_status)) {
1620                 nt_status = do_map_to_guest(nt_status, &server_info,
1621                                 user, domain);
1622         }
1623
1624         if (!NT_STATUS_IS_OK(nt_status)) {
1625                 data_blob_free(&nt_resp);
1626                 data_blob_free(&lm_resp);
1627                 data_blob_clear_free(&plaintext_password);
1628                 reply_nterror(req, nt_status_squash(nt_status));
1629                 END_PROFILE(SMBsesssetupX);
1630                 return;
1631         }
1632
1633         /* Ensure we can't possible take a code path leading to a
1634          * null defref. */
1635         if (!server_info) {
1636                 reply_nterror(req, nt_status_squash(NT_STATUS_LOGON_FAILURE));
1637                 END_PROFILE(SMBsesssetupX);
1638                 return;
1639         }
1640
1641         if (!server_info->ptok) {
1642                 nt_status = create_local_token(server_info);
1643
1644                 if (!NT_STATUS_IS_OK(nt_status)) {
1645                         DEBUG(10, ("create_local_token failed: %s\n",
1646                                    nt_errstr(nt_status)));
1647                         data_blob_free(&nt_resp);
1648                         data_blob_free(&lm_resp);
1649                         data_blob_clear_free(&plaintext_password);
1650                         reply_nterror(req, nt_status_squash(nt_status));
1651                         END_PROFILE(SMBsesssetupX);
1652                         return;
1653                 }
1654         }
1655
1656         data_blob_clear_free(&plaintext_password);
1657
1658         /* it's ok - setup a reply */
1659         reply_outbuf(req, 3, 0);
1660         if (get_Protocol() >= PROTOCOL_NT1) {
1661                 push_signature(&req->outbuf);
1662                 /* perhaps grab OS version here?? */
1663         }
1664
1665         if (server_info->guest) {
1666                 SSVAL(req->outbuf,smb_vwv2,1);
1667         }
1668
1669         /* register the name and uid as being validated, so further connections
1670            to a uid can get through without a password, on the same VC */
1671
1672         if (lp_security() == SEC_SHARE) {
1673                 sess_vuid = UID_FIELD_INVALID;
1674                 TALLOC_FREE(server_info);
1675         } else {
1676                 /* Ignore the initial vuid. */
1677                 sess_vuid = register_initial_vuid(sconn);
1678                 if (sess_vuid == UID_FIELD_INVALID) {
1679                         data_blob_free(&nt_resp);
1680                         data_blob_free(&lm_resp);
1681                         reply_nterror(req, nt_status_squash(
1682                                               NT_STATUS_LOGON_FAILURE));
1683                         END_PROFILE(SMBsesssetupX);
1684                         return;
1685                 }
1686                 /* register_existing_vuid keeps the server info */
1687                 sess_vuid = register_existing_vuid(sconn, sess_vuid,
1688                                         server_info,
1689                                         nt_resp.data ? nt_resp : lm_resp,
1690                                         sub_user);
1691                 if (sess_vuid == UID_FIELD_INVALID) {
1692                         data_blob_free(&nt_resp);
1693                         data_blob_free(&lm_resp);
1694                         reply_nterror(req, nt_status_squash(
1695                                               NT_STATUS_LOGON_FAILURE));
1696                         END_PROFILE(SMBsesssetupX);
1697                         return;
1698                 }
1699
1700                 /* current_user_info is changed on new vuid */
1701                 reload_services(sconn->msg_ctx, sconn->sock, True);
1702         }
1703
1704         data_blob_free(&nt_resp);
1705         data_blob_free(&lm_resp);
1706
1707         SSVAL(req->outbuf,smb_uid,sess_vuid);
1708         SSVAL(req->inbuf,smb_uid,sess_vuid);
1709         req->vuid = sess_vuid;
1710
1711         if (!sconn->smb1.sessions.done_sesssetup) {
1712                 sconn->smb1.sessions.max_send =
1713                         MIN(sconn->smb1.sessions.max_send,smb_bufsize);
1714         }
1715         sconn->smb1.sessions.done_sesssetup = true;
1716
1717         END_PROFILE(SMBsesssetupX);
1718         chain_reply(req);
1719         return;
1720 }