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 "../lib/tsocket/tsocket.h"
  27 #include "smbd/smbd.h"
  28 #include "smbd/globals.h"
  29 #include "../libcli/auth/spnego.h"
  30 #include "../libcli/auth/ntlmssp.h"
  31 #include "ntlmssp_wrap.h"
  32 #include "../librpc/gen_ndr/krb5pac.h"
  33 #include "libads/kerberos_proto.h"
  34 #include "../lib/util/asn1.h"
  35 #include "auth.h"
  36 #include "messages.h"
  37 #include "smbprofile.h"
  38 #include "../libcli/security/security.h"
  39
  40 /* For split krb5 SPNEGO blobs. */
  41 struct pending_auth_data {
  42         struct pending_auth_data *prev, *next;
  43         uint16 vuid; /* Tag for this entry. */
  44         uint16 smbpid; /* Alternate tag for this entry. */
  45         size_t needed_len;
  46         DATA_BLOB partial_data;
  47 };
  48
  49 /****************************************************************************
  50  Add the standard 'Samba' signature to the end of the session setup.
  51 ****************************************************************************/
  52
  53 static int push_signature(uint8 **outbuf)
  54 {
  55         char *lanman;
  56         int result, tmp;
  57
  58         result = 0;
  59
  60         tmp = message_push_string(outbuf, "Unix", STR_TERMINATE);
  61
  62         if (tmp == -1) return -1;
  63         result += tmp;
  64
  65         if (asprintf(&lanman, "Samba %s", samba_version_string()) != -1) {
  66                 tmp = message_push_string(outbuf, lanman, STR_TERMINATE);
  67                 SAFE_FREE(lanman);
  68         }
  69         else {
  70                 tmp = message_push_string(outbuf, "Samba", STR_TERMINATE);
  71         }
  72
  73         if (tmp == -1) return -1;
  74         result += tmp;
  75
  76         tmp = message_push_string(outbuf, lp_workgroup(), STR_TERMINATE);
  77
  78         if (tmp == -1) return -1;
  79         result += tmp;
  80
  81         return result;
  82 }
  83
  84 /****************************************************************************
  85  Send a security blob via a session setup reply.
  86 ****************************************************************************/
  87
  88 static void reply_sesssetup_blob(struct smb_request *req,
  89                                  DATA_BLOB blob,
  90                                  NTSTATUS nt_status)
  91 {
  92         if (!NT_STATUS_IS_OK(nt_status) &&
  93             !NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
  94                 reply_nterror(req, nt_status_squash(nt_status));
  95                 return;
  96         }
  97
  98         nt_status = nt_status_squash(nt_status);
  99         SIVAL(req->outbuf, smb_rcls, NT_STATUS_V(nt_status));
 100         SSVAL(req->outbuf, smb_vwv0, 0xFF); /* no chaining possible */
 101         SSVAL(req->outbuf, smb_vwv3, blob.length);
 102
 103         if ((message_push_blob(&req->outbuf, blob) == -1)
 104             || (push_signature(&req->outbuf) == -1)) {
 105                 reply_nterror(req, NT_STATUS_NO_MEMORY);
 106         }
 107 }
 108
 109 /****************************************************************************
 110  Do a 'guest' logon, getting back the
 111 ****************************************************************************/
 112
 113 static NTSTATUS check_guest_password(const struct tsocket_address *remote_address,
 114                                      struct auth_serversupplied_info **server_info)
 115 {
 116         struct auth_context *auth_context;
 117         struct auth_usersupplied_info *user_info = NULL;
 118
 119         NTSTATUS nt_status;
 120         static unsigned char chal[8] = { 0, };
 121
 122         DEBUG(3,("Got anonymous request\n"));
 123
 124         nt_status = make_auth_context_fixed(talloc_tos(), &auth_context, chal);
 125         if (!NT_STATUS_IS_OK(nt_status)) {
 126                 return nt_status;
 127         }
 128
 129         if (!make_user_info_guest(remote_address, &user_info)) {
 130                 TALLOC_FREE(auth_context);
 131                 return NT_STATUS_NO_MEMORY;
 132         }
 133
 134         nt_status = auth_context->check_ntlm_password(auth_context,
 135                                                 user_info,
 136                                                 server_info);
 137         TALLOC_FREE(auth_context);
 138         free_user_info(&user_info);
 139         return nt_status;
 140 }
 141
 142
 143 #ifdef HAVE_KRB5
 144
 145 #if 0
 146 /* Experiment that failed. See "only happens with a KDC" comment below. */
 147 /****************************************************************************
 148  Cerate a clock skew error blob for a Windows client.
 149 ****************************************************************************/
 150
 151 static bool make_krb5_skew_error(DATA_BLOB *pblob_out)
 152 {
 153         krb5_context context = NULL;
 154         krb5_error_code kerr = 0;
 155         krb5_data reply;
 156         krb5_principal host_princ = NULL;
 157         char *host_princ_s = NULL;
 158         bool ret = False;
 159
 160         *pblob_out = data_blob_null;
 161
 162         initialize_krb5_error_table();
 163         kerr = krb5_init_context(&context);
 164         if (kerr) {
 165                 return False;
 166         }
 167         /* Create server principal. */
 168         asprintf(&host_princ_s, "%s$@%s", lp_netbios_name(), lp_realm());
 169         if (!host_princ_s) {
 170                 goto out;
 171         }
 172         strlower_m(host_princ_s);
 173
 174         kerr = smb_krb5_parse_name(context, host_princ_s, &host_princ);
 175         if (kerr) {
 176                 DEBUG(10,("make_krb5_skew_error: smb_krb5_parse_name failed "
 177                         "for name %s: Error %s\n",
 178                         host_princ_s, error_message(kerr) ));
 179                 goto out;
 180         }
 181
 182         kerr = smb_krb5_mk_error(context, KRB5KRB_AP_ERR_SKEW,
 183                         host_princ, &reply);
 184         if (kerr) {
 185                 DEBUG(10,("make_krb5_skew_error: smb_krb5_mk_error "
 186                         "failed: Error %s\n",
 187                         error_message(kerr) ));
 188                 goto out;
 189         }
 190
 191         *pblob_out = data_blob(reply.data, reply.length);
 192         kerberos_free_data_contents(context,&reply);
 193         ret = True;
 194
 195   out:
 196
 197         if (host_princ_s) {
 198                 SAFE_FREE(host_princ_s);
 199         }
 200         if (host_princ) {
 201                 krb5_free_principal(context, host_princ);
 202         }
 203         krb5_free_context(context);
 204         return ret;
 205 }
 206 #endif
 207
 208 /****************************************************************************
 209  Reply to a session setup spnego negotiate packet for kerberos.
 210 ****************************************************************************/
 211
 212 static void reply_spnego_kerberos(struct smb_request *req,
 213                                   DATA_BLOB *secblob,
 214                                   const char *mechOID,
 215                                   uint16 vuid,
 216                                   bool *p_invalidate_vuid)
 217 {
 218         TALLOC_CTX *mem_ctx;
 219         DATA_BLOB ticket;
 220         struct passwd *pw;
 221         int sess_vuid = req->vuid;
 222         NTSTATUS ret = NT_STATUS_OK;
 223         DATA_BLOB ap_rep, ap_rep_wrapped, response;
 224         struct auth_session_info *session_info = NULL;
 225         DATA_BLOB session_key = data_blob_null;
 226         uint8 tok_id[2];
 227         DATA_BLOB nullblob = data_blob_null;
 228         bool map_domainuser_to_guest = False;
 229         bool username_was_mapped;
 230         struct PAC_LOGON_INFO *logon_info = NULL;
 231         struct smbd_server_connection *sconn = req->sconn;
 232         char *principal;
 233         char *user;
 234         char *domain;
 235         char *real_username;
 236
 237         ZERO_STRUCT(ticket);
 238         ZERO_STRUCT(ap_rep);
 239         ZERO_STRUCT(ap_rep_wrapped);
 240         ZERO_STRUCT(response);
 241
 242         /* Normally we will always invalidate the intermediate vuid. */
 243         *p_invalidate_vuid = True;
 244
 245         mem_ctx = talloc_init("reply_spnego_kerberos");
 246         if (mem_ctx == NULL) {
 247                 reply_nterror(req, nt_status_squash(NT_STATUS_NO_MEMORY));
 248                 return;
 249         }
 250
 251         if (!spnego_parse_krb5_wrap(mem_ctx, *secblob, &ticket, tok_id)) {
 252                 talloc_destroy(mem_ctx);
 253                 reply_nterror(req, nt_status_squash(NT_STATUS_LOGON_FAILURE));
 254                 return;
 255         }
 256
 257         ret = ads_verify_ticket(mem_ctx, lp_realm(), 0, &ticket,
 258                                 &principal, &logon_info, &ap_rep,
 259                                 &session_key, True);
 260
 261         data_blob_free(&ticket);
 262
 263         if (!NT_STATUS_IS_OK(ret)) {
 264 #if 0
 265                 /* Experiment that failed.
 266                  * See "only happens with a KDC" comment below. */
 267
 268                 if (NT_STATUS_EQUAL(ret, NT_STATUS_TIME_DIFFERENCE_AT_DC)) {
 269
 270                         /*
 271                          * Windows in this case returns
 272                          * NT_STATUS_MORE_PROCESSING_REQUIRED
 273                          * with a negTokenTarg blob containing an krb5_error
 274                          * struct ASN1 encoded containing KRB5KRB_AP_ERR_SKEW.
 275                          * The client then fixes its clock and continues rather
 276                          * than giving an error. JRA.
 277                          * -- Looks like this only happens with a KDC. JRA.
 278                          */
 279
 280                         bool ok = make_krb5_skew_error(&ap_rep);
 281                         if (!ok) {
 282                                 talloc_destroy(mem_ctx);
 283                                 return ERROR_NT(nt_status_squash(
 284                                                 NT_STATUS_LOGON_FAILURE));
 285                         }
 286                         ap_rep_wrapped = spnego_gen_krb5_wrap(ap_rep,
 287                                         TOK_ID_KRB_ERROR);
 288                         response = spnego_gen_auth_response(&ap_rep_wrapped,
 289                                         ret, OID_KERBEROS5_OLD);
 290                         reply_sesssetup_blob(conn, inbuf, outbuf, response,
 291                                         NT_STATUS_MORE_PROCESSING_REQUIRED);
 292
 293                         /*
 294                          * In this one case we don't invalidate the
 295                          * intermediate vuid as we're expecting the client
 296                          * to re-use it for the next sessionsetupX packet. JRA.
 297                          */
 298
 299                         *p_invalidate_vuid = False;
 300
 301                         data_blob_free(&ap_rep);
 302                         data_blob_free(&ap_rep_wrapped);
 303                         data_blob_free(&response);
 304                         talloc_destroy(mem_ctx);
 305                         return -1; /* already replied */
 306                 }
 307 #else
 308                 if (!NT_STATUS_EQUAL(ret, NT_STATUS_TIME_DIFFERENCE_AT_DC)) {
 309                         ret = NT_STATUS_LOGON_FAILURE;
 310                 }
 311 #endif
 312                 DEBUG(1,("Failed to verify incoming ticket with error %s!\n",
 313                                 nt_errstr(ret)));
 314                 talloc_destroy(mem_ctx);
 315                 reply_nterror(req, nt_status_squash(ret));
 316                 return;
 317         }
 318
 319         ret = get_user_from_kerberos_info(talloc_tos(),
 320                                           sconn->remote_hostname,
 321                                           principal, logon_info,
 322                                           &username_was_mapped,
 323                                           &map_domainuser_to_guest,
 324                                           &user, &domain,
 325                                           &real_username, &pw);
 326         if (!NT_STATUS_IS_OK(ret)) {
 327                 data_blob_free(&ap_rep);
 328                 data_blob_free(&session_key);
 329                 talloc_destroy(mem_ctx);
 330                 reply_nterror(req,nt_status_squash(NT_STATUS_LOGON_FAILURE));
 331                 return;
 332         }
 333
 334         /* save the PAC data if we have it */
 335         if (logon_info) {
 336                 netsamlogon_cache_store(user, &logon_info->info3);
 337         }
 338
 339         /* setup the string used by %U */
 340         sub_set_smb_name(real_username);
 341
 342         /* reload services so that the new %U is taken into account */
 343         reload_services(sconn->msg_ctx, sconn->sock, True);
 344
 345         ret = make_session_info_krb5(mem_ctx,
 346                                      user, domain, real_username, pw,
 347                                      logon_info, map_domainuser_to_guest,
 348                                      username_was_mapped,
 349                                      &session_key,
 350                                      &session_info);
 351         data_blob_free(&session_key);
 352         if (!NT_STATUS_IS_OK(ret)) {
 353                 DEBUG(1, ("make_server_info_krb5 failed!\n"));
 354                 data_blob_free(&ap_rep);
 355                 TALLOC_FREE(mem_ctx);
 356                 reply_nterror(req, nt_status_squash(ret));
 357                 return;
 358         }
 359
 360         if (!is_partial_auth_vuid(sconn, sess_vuid)) {
 361                 sess_vuid = register_initial_vuid(sconn);
 362         }
 363
 364         /* register_existing_vuid keeps the server info */
 365         /* register_existing_vuid takes ownership of session_key on success,
 366          * no need to free after this on success. A better interface would copy
 367          * it.... */
 368
 369         sess_vuid = register_existing_vuid(sconn, sess_vuid,
 370                                            session_info, nullblob, user);
 371
 372         reply_outbuf(req, 4, 0);
 373         SSVAL(req->outbuf,smb_uid,sess_vuid);
 374
 375         if (sess_vuid == UID_FIELD_INVALID ) {
 376                 ret = NT_STATUS_LOGON_FAILURE;
 377         } else {
 378                 /* current_user_info is changed on new vuid */
 379                 reload_services(sconn->msg_ctx, sconn->sock, True);
 380
 381                 SSVAL(req->outbuf, smb_vwv3, 0);
 382
 383                 if (security_session_user_level(session_info, NULL) < SECURITY_USER) {
 384                         SSVAL(req->outbuf,smb_vwv2,1);
 385                 }
 386
 387                 SSVAL(req->outbuf, smb_uid, sess_vuid);
 388
 389                 /* Successful logon. Keep this vuid. */
 390                 *p_invalidate_vuid = False;
 391         }
 392
 393         /* wrap that up in a nice GSS-API wrapping */
 394         if (NT_STATUS_IS_OK(ret)) {
 395                 ap_rep_wrapped = spnego_gen_krb5_wrap(talloc_tos(), ap_rep,
 396                                 TOK_ID_KRB_AP_REP);
 397         } else {
 398                 ap_rep_wrapped = data_blob_null;
 399         }
 400         response = spnego_gen_auth_response(talloc_tos(), &ap_rep_wrapped, ret,
 401                         mechOID);
 402         reply_sesssetup_blob(req, response, ret);
 403
 404         data_blob_free(&ap_rep);
 405         data_blob_free(&ap_rep_wrapped);
 406         data_blob_free(&response);
 407         TALLOC_FREE(mem_ctx);
 408 }
 409
 410 #endif
 411
 412 /****************************************************************************
 413  Send a session setup reply, wrapped in SPNEGO.
 414  Get vuid and check first.
 415  End the NTLMSSP exchange context if we are OK/complete fail
 416  This should be split into two functions, one to handle each
 417  leg of the NTLM auth steps.
 418 ***************************************************************************/
 419
 420 static void reply_spnego_ntlmssp(struct smb_request *req,
 421                                  uint16 vuid,
 422                                  struct auth_ntlmssp_state **auth_ntlmssp_state,
 423                                  DATA_BLOB *ntlmssp_blob, NTSTATUS nt_status,
 424                                  const char *OID,
 425                                  bool wrap)
 426 {
 427         bool do_invalidate = true;
 428         DATA_BLOB response;
 429         struct auth_session_info *session_info = NULL;
 430         struct smbd_server_connection *sconn = req->sconn;
 431
 432         if (NT_STATUS_IS_OK(nt_status)) {
 433                 nt_status = auth_ntlmssp_steal_session_info(talloc_tos(),
 434                                         (*auth_ntlmssp_state), &session_info);
 435         }
 436
 437         reply_outbuf(req, 4, 0);
 438
 439         SSVAL(req->outbuf, smb_uid, vuid);
 440
 441         if (NT_STATUS_IS_OK(nt_status)) {
 442                 DATA_BLOB nullblob = data_blob_null;
 443
 444                 if (!is_partial_auth_vuid(sconn, vuid)) {
 445                         nt_status = NT_STATUS_LOGON_FAILURE;
 446                         goto out;
 447                 }
 448
 449                 /* register_existing_vuid keeps the server info */
 450                 if (register_existing_vuid(sconn, vuid,
 451                                            session_info, nullblob,
 452                                            auth_ntlmssp_get_username(*auth_ntlmssp_state)) !=
 453                                            vuid) {
 454                         /* The problem is, *auth_ntlmssp_state points
 455                          * into the vuser this will have
 456                          * talloc_free()'ed in
 457                          * register_existing_vuid() */
 458                         do_invalidate = false;
 459                         nt_status = NT_STATUS_LOGON_FAILURE;
 460                         goto out;
 461                 }
 462
 463                 /* current_user_info is changed on new vuid */
 464                 reload_services(sconn->msg_ctx, sconn->sock, True);
 465
 466                 SSVAL(req->outbuf, smb_vwv3, 0);
 467
 468                 if (security_session_user_level(session_info, NULL) < SECURITY_USER) {
 469                         SSVAL(req->outbuf,smb_vwv2,1);
 470                 }
 471         }
 472
 473   out:
 474
 475         if (wrap) {
 476                 response = spnego_gen_auth_response(talloc_tos(),
 477                                 ntlmssp_blob,
 478                                 nt_status, OID);
 479         } else {
 480                 response = *ntlmssp_blob;
 481         }
 482
 483         reply_sesssetup_blob(req, response, nt_status);
 484         if (wrap) {
 485                 data_blob_free(&response);
 486         }
 487
 488         /* NT_STATUS_MORE_PROCESSING_REQUIRED from our NTLMSSP code tells us,
 489            and the other end, that we are not finished yet. */
 490
 491         if (!NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 492                 /* NB. This is *NOT* an error case. JRA */
 493                 if (do_invalidate) {
 494                         TALLOC_FREE(*auth_ntlmssp_state);
 495                         if (!NT_STATUS_IS_OK(nt_status)) {
 496                                 /* Kill the intermediate vuid */
 497                                 invalidate_vuid(sconn, vuid);
 498                         }
 499                 }
 500         }
 501 }
 502
 503 /****************************************************************************
 504  Is this a krb5 mechanism ?
 505 ****************************************************************************/
 506
 507 NTSTATUS parse_spnego_mechanisms(TALLOC_CTX *ctx,
 508                 DATA_BLOB blob_in,
 509                 DATA_BLOB *pblob_out,
 510                 char **kerb_mechOID)
 511 {
 512         char *OIDs[ASN1_MAX_OIDS];
 513         int i;
 514         NTSTATUS ret = NT_STATUS_OK;
 515
 516         *kerb_mechOID = NULL;
 517
 518         /* parse out the OIDs and the first sec blob */
 519         if (!spnego_parse_negTokenInit(ctx, blob_in, OIDs, NULL, pblob_out) ||
 520                         (OIDs[0] == NULL)) {
 521                 return NT_STATUS_LOGON_FAILURE;
 522         }
 523
 524         /* only look at the first OID for determining the mechToken --
 525            according to RFC2478, we should choose the one we want
 526            and renegotiate, but i smell a client bug here..
 527
 528            Problem observed when connecting to a member (samba box)
 529            of an AD domain as a user in a Samba domain.  Samba member
 530            server sent back krb5/mskrb5/ntlmssp as mechtypes, but the
 531            client (2ksp3) replied with ntlmssp/mskrb5/krb5 and an
 532            NTLMSSP mechtoken.                 --jerry              */
 533
 534 #ifdef HAVE_KRB5
 535         if (strcmp(OID_KERBEROS5, OIDs[0]) == 0 ||
 536             strcmp(OID_KERBEROS5_OLD, OIDs[0]) == 0) {
 537                 *kerb_mechOID = talloc_strdup(ctx, OIDs[0]);
 538                 if (*kerb_mechOID == NULL) {
 539                         ret = NT_STATUS_NO_MEMORY;
 540                 }
 541         }
 542 #endif
 543
 544         for (i=0;OIDs[i];i++) {
 545                 DEBUG(5,("parse_spnego_mechanisms: Got OID %s\n", OIDs[i]));
 546                 talloc_free(OIDs[i]);
 547         }
 548         return ret;
 549 }
 550
 551 /****************************************************************************
 552  Fall back from krb5 to NTLMSSP.
 553 ****************************************************************************/
 554
 555 static void reply_spnego_downgrade_to_ntlmssp(struct smb_request *req,
 556                                                 uint16 vuid)
 557 {
 558         DATA_BLOB response;
 559
 560         reply_outbuf(req, 4, 0);
 561         SSVAL(req->outbuf,smb_uid,vuid);
 562
 563         DEBUG(3,("reply_spnego_downgrade_to_ntlmssp: Got krb5 ticket in SPNEGO "
 564                 "but set to downgrade to NTLMSSP\n"));
 565
 566         response = spnego_gen_auth_response(talloc_tos(), NULL,
 567                         NT_STATUS_MORE_PROCESSING_REQUIRED,
 568                         OID_NTLMSSP);
 569         reply_sesssetup_blob(req, response, NT_STATUS_MORE_PROCESSING_REQUIRED);
 570         data_blob_free(&response);
 571 }
 572
 573 /****************************************************************************
 574  Reply to a session setup spnego negotiate packet.
 575 ****************************************************************************/
 576
 577 static void reply_spnego_negotiate(struct smb_request *req,
 578                                    uint16 vuid,
 579                                    DATA_BLOB blob1,
 580                                    struct auth_ntlmssp_state **auth_ntlmssp_state)
 581 {
 582         DATA_BLOB secblob;
 583         DATA_BLOB chal;
 584         char *kerb_mech = NULL;
 585         NTSTATUS status;
 586         struct smbd_server_connection *sconn = req->sconn;
 587
 588         status = parse_spnego_mechanisms(talloc_tos(),
 589                         blob1, &secblob, &kerb_mech);
 590         if (!NT_STATUS_IS_OK(status)) {
 591                 /* Kill the intermediate vuid */
 592                 invalidate_vuid(sconn, vuid);
 593                 reply_nterror(req, nt_status_squash(status));
 594                 return;
 595         }
 596
 597         DEBUG(3,("reply_spnego_negotiate: Got secblob of size %lu\n",
 598                                 (unsigned long)secblob.length));
 599
 600 #ifdef HAVE_KRB5
 601         if (kerb_mech && ((lp_security()==SEC_ADS) ||
 602                                 USE_KERBEROS_KEYTAB) ) {
 603                 bool destroy_vuid = True;
 604                 reply_spnego_kerberos(req, &secblob, kerb_mech,
 605                                       vuid, &destroy_vuid);
 606                 data_blob_free(&secblob);
 607                 if (destroy_vuid) {
 608                         /* Kill the intermediate vuid */
 609                         invalidate_vuid(sconn, vuid);
 610                 }
 611                 TALLOC_FREE(kerb_mech);
 612                 return;
 613         }
 614 #endif
 615
 616         TALLOC_FREE(*auth_ntlmssp_state);
 617
 618         if (kerb_mech) {
 619                 data_blob_free(&secblob);
 620                 /* The mechtoken is a krb5 ticket, but
 621                  * we need to fall back to NTLM. */
 622                 reply_spnego_downgrade_to_ntlmssp(req, vuid);
 623                 TALLOC_FREE(kerb_mech);
 624                 return;
 625         }
 626
 627         status = auth_ntlmssp_start(sconn->remote_address,
 628                                     auth_ntlmssp_state);
 629         if (!NT_STATUS_IS_OK(status)) {
 630                 /* Kill the intermediate vuid */
 631                 invalidate_vuid(sconn, vuid);
 632                 reply_nterror(req, nt_status_squash(status));
 633                 return;
 634         }
 635
 636         status = auth_ntlmssp_update(*auth_ntlmssp_state,
 637                                         secblob, &chal);
 638
 639         data_blob_free(&secblob);
 640
 641         reply_spnego_ntlmssp(req, vuid, auth_ntlmssp_state,
 642                              &chal, status, OID_NTLMSSP, true);
 643
 644         data_blob_free(&chal);
 645
 646         /* already replied */
 647         return;
 648 }
 649
 650 /****************************************************************************
 651  Reply to a session setup spnego auth packet.
 652 ****************************************************************************/
 653
 654 static void reply_spnego_auth(struct smb_request *req,
 655                               uint16 vuid,
 656                               DATA_BLOB blob1,
 657                               struct auth_ntlmssp_state **auth_ntlmssp_state)
 658 {
 659         DATA_BLOB auth = data_blob_null;
 660         DATA_BLOB auth_reply = data_blob_null;
 661         DATA_BLOB secblob = data_blob_null;
 662         NTSTATUS status = NT_STATUS_LOGON_FAILURE;
 663         struct smbd_server_connection *sconn = req->sconn;
 664
 665         if (!spnego_parse_auth(talloc_tos(), blob1, &auth)) {
 666 #if 0
 667                 file_save("auth.dat", blob1.data, blob1.length);
 668 #endif
 669                 /* Kill the intermediate vuid */
 670                 invalidate_vuid(sconn, vuid);
 671
 672                 reply_nterror(req, nt_status_squash(
 673                                       NT_STATUS_LOGON_FAILURE));
 674                 return;
 675         }
 676
 677         if (auth.data[0] == ASN1_APPLICATION(0)) {
 678                 /* Might be a second negTokenTarg packet */
 679                 char *kerb_mech = NULL;
 680
 681                 status = parse_spnego_mechanisms(talloc_tos(),
 682                                 auth, &secblob, &kerb_mech);
 683
 684                 if (!NT_STATUS_IS_OK(status)) {
 685                         /* Kill the intermediate vuid */
 686                         invalidate_vuid(sconn, vuid);
 687                         reply_nterror(req, nt_status_squash(status));
 688                         return;
 689                 }
 690
 691                 DEBUG(3,("reply_spnego_auth: Got secblob of size %lu\n",
 692                                 (unsigned long)secblob.length));
 693 #ifdef HAVE_KRB5
 694                 if (kerb_mech && ((lp_security()==SEC_ADS) ||
 695                                         USE_KERBEROS_KEYTAB)) {
 696                         bool destroy_vuid = True;
 697                         reply_spnego_kerberos(req, &secblob, kerb_mech,
 698                                               vuid, &destroy_vuid);
 699                         data_blob_free(&secblob);
 700                         data_blob_free(&auth);
 701                         if (destroy_vuid) {
 702                                 /* Kill the intermediate vuid */
 703                                 invalidate_vuid(sconn, vuid);
 704                         }
 705                         TALLOC_FREE(kerb_mech);
 706                         return;
 707                 }
 708 #endif
 709                 /* Can't blunder into NTLMSSP auth if we have
 710                  * a krb5 ticket. */
 711
 712                 if (kerb_mech) {
 713                         /* Kill the intermediate vuid */
 714                         invalidate_vuid(sconn, vuid);
 715                         DEBUG(3,("reply_spnego_auth: network "
 716                                 "misconfiguration, client sent us a "
 717                                 "krb5 ticket and kerberos security "
 718                                 "not enabled\n"));
 719                         reply_nterror(req, nt_status_squash(
 720                                         NT_STATUS_LOGON_FAILURE));
 721                         TALLOC_FREE(kerb_mech);
 722                 }
 723         }
 724
 725         /* If we get here it wasn't a negTokenTarg auth packet. */
 726         data_blob_free(&secblob);
 727
 728         if (!*auth_ntlmssp_state) {
 729                 status = auth_ntlmssp_start(sconn->remote_address,
 730                                             auth_ntlmssp_state);
 731                 if (!NT_STATUS_IS_OK(status)) {
 732                         /* Kill the intermediate vuid */
 733                         invalidate_vuid(sconn, vuid);
 734                         reply_nterror(req, nt_status_squash(status));
 735                         return;
 736                 }
 737         }
 738
 739         status = auth_ntlmssp_update(*auth_ntlmssp_state,
 740                                         auth, &auth_reply);
 741
 742         data_blob_free(&auth);
 743
 744         /* Don't send the mechid as we've already sent this (RFC4178). */
 745
 746         reply_spnego_ntlmssp(req, vuid,
 747                              auth_ntlmssp_state,
 748                              &auth_reply, status, NULL, true);
 749
 750         data_blob_free(&auth_reply);
 751
 752         /* and tell smbd that we have already replied to this packet */
 753         return;
 754 }
 755
 756 /****************************************************************************
 757  Delete an entry on the list.
 758 ****************************************************************************/
 759
 760 static void delete_partial_auth(struct smbd_server_connection *sconn,
 761                                 struct pending_auth_data *pad)
 762 {
 763         if (!pad) {
 764                 return;
 765         }
 766         DLIST_REMOVE(sconn->smb1.pd_list, pad);
 767         data_blob_free(&pad->partial_data);
 768         SAFE_FREE(pad);
 769 }
 770
 771 /****************************************************************************
 772  Search for a partial SPNEGO auth fragment matching an smbpid.
 773 ****************************************************************************/
 774
 775 static struct pending_auth_data *get_pending_auth_data(
 776                 struct smbd_server_connection *sconn,
 777                 uint16_t smbpid)
 778 {
 779         struct pending_auth_data *pad;
 780 /*
 781  * NOTE: using the smbpid here is completely wrong...
 782  *       see [MS-SMB]
 783  *       3.3.5.3 Receiving an SMB_COM_SESSION_SETUP_ANDX Request
 784  */
 785         for (pad = sconn->smb1.pd_list; pad; pad = pad->next) {
 786                 if (pad->smbpid == smbpid) {
 787                         break;
 788                 }
 789         }
 790         return pad;
 791 }
 792
 793 /****************************************************************************
 794  Check the size of an SPNEGO blob. If we need more return
 795  NT_STATUS_MORE_PROCESSING_REQUIRED, else return NT_STATUS_OK. Don't allow
 796  the blob to be more than 64k.
 797 ****************************************************************************/
 798
 799 static NTSTATUS check_spnego_blob_complete(struct smbd_server_connection *sconn,
 800                                            uint16 smbpid, uint16 vuid,
 801                                            DATA_BLOB *pblob)
 802 {
 803         struct pending_auth_data *pad = NULL;
 804         ASN1_DATA *data;
 805         size_t needed_len = 0;
 806
 807         pad = get_pending_auth_data(sconn, smbpid);
 808
 809         /* Ensure we have some data. */
 810         if (pblob->length == 0) {
 811                 /* Caller can cope. */
 812                 DEBUG(2,("check_spnego_blob_complete: zero blob length !\n"));
 813                 delete_partial_auth(sconn, pad);
 814                 return NT_STATUS_OK;
 815         }
 816
 817         /* Were we waiting for more data ? */
 818         if (pad) {
 819                 DATA_BLOB tmp_blob;
 820                 size_t copy_len = MIN(65536, pblob->length);
 821
 822                 /* Integer wrap paranoia.... */
 823
 824                 if (pad->partial_data.length + copy_len <
 825                                 pad->partial_data.length ||
 826                     pad->partial_data.length + copy_len < copy_len) {
 827
 828                         DEBUG(2,("check_spnego_blob_complete: integer wrap "
 829                                 "pad->partial_data.length = %u, "
 830                                 "copy_len = %u\n",
 831                                 (unsigned int)pad->partial_data.length,
 832                                 (unsigned int)copy_len ));
 833
 834                         delete_partial_auth(sconn, pad);
 835                         return NT_STATUS_INVALID_PARAMETER;
 836                 }
 837
 838                 DEBUG(10,("check_spnego_blob_complete: "
 839                         "pad->partial_data.length = %u, "
 840                         "pad->needed_len = %u, "
 841                         "copy_len = %u, "
 842                         "pblob->length = %u,\n",
 843                         (unsigned int)pad->partial_data.length,
 844                         (unsigned int)pad->needed_len,
 845                         (unsigned int)copy_len,
 846                         (unsigned int)pblob->length ));
 847
 848                 tmp_blob = data_blob(NULL,
 849                                 pad->partial_data.length + copy_len);
 850
 851                 /* Concatenate the two (up to copy_len) bytes. */
 852                 memcpy(tmp_blob.data,
 853                         pad->partial_data.data,
 854                         pad->partial_data.length);
 855                 memcpy(tmp_blob.data + pad->partial_data.length,
 856                         pblob->data,
 857                         copy_len);
 858
 859                 /* Replace the partial data. */
 860                 data_blob_free(&pad->partial_data);
 861                 pad->partial_data = tmp_blob;
 862                 ZERO_STRUCT(tmp_blob);
 863
 864                 /* Are we done ? */
 865                 if (pblob->length >= pad->needed_len) {
 866                         /* Yes, replace pblob. */
 867                         data_blob_free(pblob);
 868                         *pblob = pad->partial_data;
 869                         ZERO_STRUCT(pad->partial_data);
 870                         delete_partial_auth(sconn, pad);
 871                         return NT_STATUS_OK;
 872                 }
 873
 874                 /* Still need more data. */
 875                 pad->needed_len -= copy_len;
 876                 return NT_STATUS_MORE_PROCESSING_REQUIRED;
 877         }
 878
 879         if ((pblob->data[0] != ASN1_APPLICATION(0)) &&
 880             (pblob->data[0] != ASN1_CONTEXT(1))) {
 881                 /* Not something we can determine the
 882                  * length of.
 883                  */
 884                 return NT_STATUS_OK;
 885         }
 886
 887         /* This is a new SPNEGO sessionsetup - see if
 888          * the data given in this blob is enough.
 889          */
 890
 891         data = asn1_init(NULL);
 892         if (data == NULL) {
 893                 return NT_STATUS_NO_MEMORY;
 894         }
 895
 896         asn1_load(data, *pblob);
 897         if (asn1_start_tag(data, pblob->data[0])) {
 898                 /* asn1_start_tag checks if the given
 899                    length of the blob is enough to complete
 900                    the tag. If it returns true we know
 901                    there is nothing to do - the blob is
 902                    complete. */
 903                 asn1_free(data);
 904                 return NT_STATUS_OK;
 905         }
 906
 907         if (data->nesting == NULL) {
 908                 /* Incorrect tag, allocation failed,
 909                    or reading the tag length failed.
 910                    Let the caller catch. */
 911                 asn1_free(data);
 912                 return NT_STATUS_OK;
 913         }
 914
 915         /* Here we know asn1_start_tag() has set data->has_error to true.
 916            asn1_tag_remaining() will have failed due to the given blob
 917            being too short. We need to work out how short. */
 918
 919         /* Integer wrap paranoia.... */
 920
 921         if (data->nesting->taglen + data->nesting->start < data->nesting->taglen ||
 922             data->nesting->taglen + data->nesting->start < data->nesting->start) {
 923
 924                 DEBUG(2,("check_spnego_blob_complete: integer wrap "
 925                         "data.nesting->taglen = %u, "
 926                         "data.nesting->start = %u\n",
 927                         (unsigned int)data->nesting->taglen,
 928                         (unsigned int)data->nesting->start ));
 929
 930                 asn1_free(data);
 931                 return NT_STATUS_INVALID_PARAMETER;
 932         }
 933
 934         /* Total length of the needed asn1 is the tag length
 935          * plus the current offset. */
 936
 937         needed_len = data->nesting->taglen + data->nesting->start;
 938         asn1_free(data);
 939
 940         DEBUG(10,("check_spnego_blob_complete: needed_len = %u, "
 941                 "pblob->length = %u\n",
 942                 (unsigned int)needed_len,
 943                 (unsigned int)pblob->length ));
 944
 945         if (needed_len <= pblob->length) {
 946                 /* Nothing to do - blob is complete. */
 947                 /* THIS SHOULD NOT HAPPEN - asn1_start_tag()
 948                    above should have caught this !!! */
 949                 DEBUG(0,("check_spnego_blob_complete: logic "
 950                         "error (needed_len = %u, "
 951                         "pblob->length = %u).\n",
 952                         (unsigned int)needed_len,
 953                         (unsigned int)pblob->length ));
 954                 return NT_STATUS_OK;
 955         }
 956
 957         /* Refuse the blob if it's bigger than 64k. */
 958         if (needed_len > 65536) {
 959                 DEBUG(2,("check_spnego_blob_complete: needed_len "
 960                         "too large (%u)\n",
 961                         (unsigned int)needed_len ));
 962                 return NT_STATUS_INVALID_PARAMETER;
 963         }
 964
 965         /* We must store this blob until complete. */
 966         if (!(pad = SMB_MALLOC_P(struct pending_auth_data))) {
 967                 return NT_STATUS_NO_MEMORY;
 968         }
 969         pad->needed_len = needed_len - pblob->length;
 970         pad->partial_data = data_blob(pblob->data, pblob->length);
 971         if (pad->partial_data.data == NULL) {
 972                 SAFE_FREE(pad);
 973                 return NT_STATUS_NO_MEMORY;
 974         }
 975         pad->smbpid = smbpid;
 976         pad->vuid = vuid;
 977         DLIST_ADD(sconn->smb1.pd_list, pad);
 978
 979         return NT_STATUS_MORE_PROCESSING_REQUIRED;
 980 }
 981
 982 /****************************************************************************
 983  Reply to a session setup command.
 984  conn POINTER CAN BE NULL HERE !
 985 ****************************************************************************/
 986
 987 static void reply_sesssetup_and_X_spnego(struct smb_request *req)
 988 {
 989         const uint8 *p;
 990         DATA_BLOB blob1;
 991         size_t bufrem;
 992         char *tmp;
 993         const char *native_os;
 994         const char *native_lanman;
 995         const char *primary_domain;
 996         const char *p2;
 997         uint16 data_blob_len = SVAL(req->vwv+7, 0);
 998         enum remote_arch_types ra_type = get_remote_arch();
 999         int vuid = req->vuid;
1000         user_struct *vuser = NULL;
1001         NTSTATUS status = NT_STATUS_OK;
1002         uint16 smbpid = req->smbpid;
1003         struct smbd_server_connection *sconn = req->sconn;
1004
1005         DEBUG(3,("Doing spnego session setup\n"));
1006
1007         if (global_client_caps == 0) {
1008                 global_client_caps = IVAL(req->vwv+10, 0);
1009
1010                 if (!(global_client_caps & CAP_STATUS32)) {
1011                         remove_from_common_flags2(FLAGS2_32_BIT_ERROR_CODES);
1012                 }
1013
1014         }
1015
1016         p = req->buf;
1017
1018         if (data_blob_len == 0) {
1019                 /* an invalid request */
1020                 reply_nterror(req, nt_status_squash(NT_STATUS_LOGON_FAILURE));
1021                 return;
1022         }
1023
1024         bufrem = smbreq_bufrem(req, p);
1025         /* pull the spnego blob */
1026         blob1 = data_blob(p, MIN(bufrem, data_blob_len));
1027
1028 #if 0
1029         file_save("negotiate.dat", blob1.data, blob1.length);
1030 #endif
1031
1032         p2 = (const char *)req->buf + blob1.length;
1033
1034         p2 += srvstr_pull_req_talloc(talloc_tos(), req, &tmp, p2,
1035                                      STR_TERMINATE);
1036         native_os = tmp ? tmp : "";
1037
1038         p2 += srvstr_pull_req_talloc(talloc_tos(), req, &tmp, p2,
1039                                      STR_TERMINATE);
1040         native_lanman = tmp ? tmp : "";
1041
1042         p2 += srvstr_pull_req_talloc(talloc_tos(), req, &tmp, p2,
1043                                      STR_TERMINATE);
1044         primary_domain = tmp ? tmp : "";
1045
1046         DEBUG(3,("NativeOS=[%s] NativeLanMan=[%s] PrimaryDomain=[%s]\n",
1047                 native_os, native_lanman, primary_domain));
1048
1049         if ( ra_type == RA_WIN2K ) {
1050                 /* Vista sets neither the OS or lanman strings */
1051
1052                 if ( !strlen(native_os) && !strlen(native_lanman) )
1053                         set_remote_arch(RA_VISTA);
1054
1055                 /* Windows 2003 doesn't set the native lanman string,
1056                    but does set primary domain which is a bug I think */
1057
1058                 if ( !strlen(native_lanman) ) {
1059                         ra_lanman_string( primary_domain );
1060                 } else {
1061                         ra_lanman_string( native_lanman );
1062                 }
1063         } else if ( ra_type == RA_VISTA ) {
1064                 if ( strncmp(native_os, "Mac OS X", 8) == 0 ) {
1065                         set_remote_arch(RA_OSX);
1066                 }
1067         }
1068
1069         /* Did we get a valid vuid ? */
1070         if (!is_partial_auth_vuid(sconn, vuid)) {
1071                 /* No, then try and see if this is an intermediate sessionsetup
1072                  * for a large SPNEGO packet. */
1073                 struct pending_auth_data *pad;
1074                 pad = get_pending_auth_data(sconn, smbpid);
1075                 if (pad) {
1076                         DEBUG(10,("reply_sesssetup_and_X_spnego: found "
1077                                 "pending vuid %u\n",
1078                                 (unsigned int)pad->vuid ));
1079                         vuid = pad->vuid;
1080                 }
1081         }
1082
1083         /* Do we have a valid vuid now ? */
1084         if (!is_partial_auth_vuid(sconn, vuid)) {
1085                 /* No, start a new authentication setup. */
1086                 vuid = register_initial_vuid(sconn);
1087                 if (vuid == UID_FIELD_INVALID) {
1088                         data_blob_free(&blob1);
1089                         reply_nterror(req, nt_status_squash(
1090                                               NT_STATUS_INVALID_PARAMETER));
1091                         return;
1092                 }
1093         }
1094
1095         vuser = get_partial_auth_user_struct(sconn, vuid);
1096         /* This MUST be valid. */
1097         if (!vuser) {
1098                 smb_panic("reply_sesssetup_and_X_spnego: invalid vuid.");
1099         }
1100
1101         /* Large (greater than 4k) SPNEGO blobs are split into multiple
1102          * sessionsetup requests as the Windows limit on the security blob
1103          * field is 4k. Bug #4400. JRA.
1104          */
1105
1106         status = check_spnego_blob_complete(sconn, smbpid, vuid, &blob1);
1107         if (!NT_STATUS_IS_OK(status)) {
1108                 if (!NT_STATUS_EQUAL(status,
1109                                 NT_STATUS_MORE_PROCESSING_REQUIRED)) {
1110                         /* Real error - kill the intermediate vuid */
1111                         invalidate_vuid(sconn, vuid);
1112                 }
1113                 data_blob_free(&blob1);
1114                 reply_nterror(req, nt_status_squash(status));
1115                 return;
1116         }
1117
1118         if (blob1.data[0] == ASN1_APPLICATION(0)) {
1119
1120                 /* its a negTokenTarg packet */
1121
1122                 reply_spnego_negotiate(req, vuid, blob1,
1123                                        &vuser->auth_ntlmssp_state);
1124                 data_blob_free(&blob1);
1125                 return;
1126         }
1127
1128         if (blob1.data[0] == ASN1_CONTEXT(1)) {
1129
1130                 /* its a auth packet */
1131
1132                 reply_spnego_auth(req, vuid, blob1,
1133                                   &vuser->auth_ntlmssp_state);
1134                 data_blob_free(&blob1);
1135                 return;
1136         }
1137
1138         if (strncmp((char *)(blob1.data), "NTLMSSP", 7) == 0) {
1139                 DATA_BLOB chal;
1140
1141                 if (!vuser->auth_ntlmssp_state) {
1142                         status = auth_ntlmssp_start(sconn->remote_address,
1143                                                     &vuser->auth_ntlmssp_state);
1144                         if (!NT_STATUS_IS_OK(status)) {
1145                                 /* Kill the intermediate vuid */
1146                                 invalidate_vuid(sconn, vuid);
1147                                 data_blob_free(&blob1);
1148                                 reply_nterror(req, nt_status_squash(status));
1149                                 return;
1150                         }
1151                 }
1152
1153                 status = auth_ntlmssp_update(vuser->auth_ntlmssp_state,
1154                                                 blob1, &chal);
1155
1156                 data_blob_free(&blob1);
1157
1158                 reply_spnego_ntlmssp(req, vuid,
1159                                      &vuser->auth_ntlmssp_state,
1160                                      &chal, status, OID_NTLMSSP, false);
1161                 data_blob_free(&chal);
1162                 return;
1163         }
1164
1165         /* what sort of packet is this? */
1166         DEBUG(1,("Unknown packet in reply_sesssetup_and_X_spnego\n"));
1167
1168         data_blob_free(&blob1);
1169
1170         reply_nterror(req, nt_status_squash(NT_STATUS_LOGON_FAILURE));
1171 }
1172
1173 /****************************************************************************
1174  On new VC == 0, shutdown *all* old connections and users.
1175  It seems that only NT4.x does this. At W2K and above (XP etc.).
1176  a new session setup with VC==0 is ignored.
1177 ****************************************************************************/
1178
1179 struct shutdown_state {
1180         const char *ip;
1181         struct messaging_context *msg_ctx;
1182 };
1183
1184 static int shutdown_other_smbds(const struct connections_key *key,
1185                                 const struct connections_data *crec,
1186                                 void *private_data)
1187 {
1188         struct shutdown_state *state = (struct shutdown_state *)private_data;
1189
1190         DEBUG(10, ("shutdown_other_smbds: %s, %s\n",
1191                    server_id_str(talloc_tos(), &crec->pid), crec->addr));
1192
1193         if (!process_exists(crec->pid)) {
1194                 DEBUG(10, ("process does not exist\n"));
1195                 return 0;
1196         }
1197
1198         if (procid_is_me(&crec->pid)) {
1199                 DEBUG(10, ("It's me\n"));
1200                 return 0;
1201         }
1202
1203         if (strcmp(state->ip, crec->addr) != 0) {
1204                 DEBUG(10, ("%s does not match %s\n", state->ip, crec->addr));
1205                 return 0;
1206         }
1207
1208         DEBUG(1, ("shutdown_other_smbds: shutting down pid %u "
1209                   "(IP %s)\n", (unsigned int)procid_to_pid(&crec->pid),
1210                   state->ip));
1211
1212         messaging_send(state->msg_ctx, crec->pid, MSG_SHUTDOWN,
1213                        &data_blob_null);
1214         return 0;
1215 }
1216
1217 static void setup_new_vc_session(struct smbd_server_connection *sconn)
1218 {
1219         DEBUG(2,("setup_new_vc_session: New VC == 0, if NT4.x "
1220                 "compatible we would close all old resources.\n"));
1221 #if 0
1222         conn_close_all();
1223         invalidate_all_vuids();
1224 #endif
1225         if (lp_reset_on_zero_vc()) {
1226                 char *addr;
1227                 struct shutdown_state state;
1228
1229                 addr = tsocket_address_inet_addr_string(
1230                         sconn->remote_address, talloc_tos());
1231                 if (addr == NULL) {
1232                         return;
1233                 }
1234                 state.ip = addr;
1235                 state.msg_ctx = sconn->msg_ctx;
1236                 connections_forall_read(shutdown_other_smbds, &state);
1237                 TALLOC_FREE(addr);
1238         }
1239 }
1240
1241 /****************************************************************************
1242  Reply to a session setup command.
1243 ****************************************************************************/
1244
1245 void reply_sesssetup_and_X(struct smb_request *req)
1246 {
1247         int sess_vuid;
1248         int smb_bufsize;
1249         DATA_BLOB lm_resp;
1250         DATA_BLOB nt_resp;
1251         DATA_BLOB plaintext_password;
1252         char *tmp;
1253         const char *user;
1254         fstring sub_user; /* Sanitised username for substituion */
1255         const char *domain;
1256         const char *native_os;
1257         const char *native_lanman;
1258         const char *primary_domain;
1259         struct auth_usersupplied_info *user_info = NULL;
1260         struct auth_serversupplied_info *server_info = NULL;
1261         struct auth_session_info *session_info = NULL;
1262         uint16 smb_flag2 = req->flags2;
1263
1264         NTSTATUS nt_status;
1265         struct smbd_server_connection *sconn = req->sconn;
1266
1267         bool doencrypt = sconn->smb1.negprot.encrypted_passwords;
1268
1269         START_PROFILE(SMBsesssetupX);
1270
1271         ZERO_STRUCT(lm_resp);
1272         ZERO_STRUCT(nt_resp);
1273         ZERO_STRUCT(plaintext_password);
1274
1275         DEBUG(3,("wct=%d flg2=0x%x\n", req->wct, req->flags2));
1276
1277         /* a SPNEGO session setup has 12 command words, whereas a normal
1278            NT1 session setup has 13. See the cifs spec. */
1279         if (req->wct == 12 &&
1280             (req->flags2 & FLAGS2_EXTENDED_SECURITY)) {
1281
1282                 if (!sconn->smb1.negprot.spnego) {
1283                         DEBUG(0,("reply_sesssetup_and_X:  Rejecting attempt "
1284                                  "at SPNEGO session setup when it was not "
1285                                  "negotiated.\n"));
1286                         reply_nterror(req, nt_status_squash(
1287                                               NT_STATUS_LOGON_FAILURE));
1288                         END_PROFILE(SMBsesssetupX);
1289                         return;
1290                 }
1291
1292                 if (SVAL(req->vwv+4, 0) == 0) {
1293                         setup_new_vc_session(req->sconn);
1294                 }
1295
1296                 reply_sesssetup_and_X_spnego(req);
1297                 END_PROFILE(SMBsesssetupX);
1298                 return;
1299         }
1300
1301         smb_bufsize = SVAL(req->vwv+2, 0);
1302
1303         if (get_Protocol() < PROTOCOL_NT1) {
1304                 uint16 passlen1 = SVAL(req->vwv+7, 0);
1305
1306                 /* Never do NT status codes with protocols before NT1 as we
1307                  * don't get client caps. */
1308                 remove_from_common_flags2(FLAGS2_32_BIT_ERROR_CODES);
1309
1310                 if ((passlen1 > MAX_PASS_LEN) || (passlen1 > req->buflen)) {
1311                         reply_nterror(req, nt_status_squash(
1312                                               NT_STATUS_INVALID_PARAMETER));
1313                         END_PROFILE(SMBsesssetupX);
1314                         return;
1315                 }
1316
1317                 if (doencrypt) {
1318                         lm_resp = data_blob(req->buf, passlen1);
1319                 } else {
1320                         plaintext_password = data_blob(req->buf, passlen1+1);
1321                         /* Ensure null termination */
1322                         plaintext_password.data[passlen1] = 0;
1323                 }
1324
1325                 srvstr_pull_req_talloc(talloc_tos(), req, &tmp,
1326                                        req->buf + passlen1, STR_TERMINATE);
1327                 user = tmp ? tmp : "";
1328
1329                 domain = "";
1330
1331         } else {
1332                 uint16 passlen1 = SVAL(req->vwv+7, 0);
1333                 uint16 passlen2 = SVAL(req->vwv+8, 0);
1334                 enum remote_arch_types ra_type = get_remote_arch();
1335                 const uint8_t *p = req->buf;
1336                 const uint8_t *save_p = req->buf;
1337                 uint16 byte_count;
1338
1339
1340                 if(global_client_caps == 0) {
1341                         global_client_caps = IVAL(req->vwv+11, 0);
1342
1343                         if (!(global_client_caps & CAP_STATUS32)) {
1344                                 remove_from_common_flags2(
1345                                                 FLAGS2_32_BIT_ERROR_CODES);
1346                         }
1347
1348                         /* client_caps is used as final determination if
1349                          * client is NT or Win95. This is needed to return
1350                          * the correct error codes in some circumstances.
1351                         */
1352
1353                         if(ra_type == RA_WINNT || ra_type == RA_WIN2K ||
1354                                         ra_type == RA_WIN95) {
1355                                 if(!(global_client_caps & (CAP_NT_SMBS|
1356                                                         CAP_STATUS32))) {
1357                                         set_remote_arch( RA_WIN95);
1358                                 }
1359                         }
1360                 }
1361
1362                 if (!doencrypt) {
1363                         /* both Win95 and WinNT stuff up the password
1364                          * lengths for non-encrypting systems. Uggh.
1365
1366                            if passlen1==24 its a win95 system, and its setting
1367                            the password length incorrectly. Luckily it still
1368                            works with the default code because Win95 will null
1369                            terminate the password anyway
1370
1371                            if passlen1>0 and passlen2>0 then maybe its a NT box
1372                            and its setting passlen2 to some random value which
1373                            really stuffs things up. we need to fix that one.  */
1374
1375                         if (passlen1 > 0 && passlen2 > 0 && passlen2 != 24 &&
1376                                         passlen2 != 1) {
1377                                 passlen2 = 0;
1378                         }
1379                 }
1380
1381                 /* check for nasty tricks */
1382                 if (passlen1 > MAX_PASS_LEN
1383                     || passlen1 > smbreq_bufrem(req, p)) {
1384                         reply_nterror(req, nt_status_squash(
1385                                               NT_STATUS_INVALID_PARAMETER));
1386                         END_PROFILE(SMBsesssetupX);
1387                         return;
1388                 }
1389
1390                 if (passlen2 > MAX_PASS_LEN
1391                     || passlen2 > smbreq_bufrem(req, p+passlen1)) {
1392                         reply_nterror(req, nt_status_squash(
1393                                               NT_STATUS_INVALID_PARAMETER));
1394                         END_PROFILE(SMBsesssetupX);
1395                         return;
1396                 }
1397
1398                 /* Save the lanman2 password and the NT md4 password. */
1399
1400                 if ((doencrypt) && (passlen1 != 0) && (passlen1 != 24)) {
1401                         doencrypt = False;
1402                 }
1403
1404                 if (doencrypt) {
1405                         lm_resp = data_blob(p, passlen1);
1406                         nt_resp = data_blob(p+passlen1, passlen2);
1407                 } else if (lp_security() != SEC_SHARE) {
1408                         /*
1409                          * In share level we should ignore any passwords, so
1410                          * only read them if we're not.
1411                          */
1412                         char *pass = NULL;
1413                         bool unic= smb_flag2 & FLAGS2_UNICODE_STRINGS;
1414
1415                         if (unic && (passlen2 == 0) && passlen1) {
1416                                 /* Only a ascii plaintext password was sent. */
1417                                 (void)srvstr_pull_talloc(talloc_tos(),
1418                                                         req->inbuf,
1419                                                         req->flags2,
1420                                                         &pass,
1421                                                         req->buf,
1422                                                         passlen1,
1423                                                         STR_TERMINATE|STR_ASCII);
1424                         } else {
1425                                 (void)srvstr_pull_talloc(talloc_tos(),
1426                                                         req->inbuf,
1427                                                         req->flags2,
1428                                                         &pass,
1429                                                         req->buf,
1430                                                         unic ? passlen2 : passlen1,
1431                                                         STR_TERMINATE);
1432                         }
1433                         if (!pass) {
1434                                 reply_nterror(req, nt_status_squash(
1435                                               NT_STATUS_INVALID_PARAMETER));
1436                                 END_PROFILE(SMBsesssetupX);
1437                                 return;
1438                         }
1439                         plaintext_password = data_blob(pass, strlen(pass)+1);
1440                 }
1441
1442                 p += passlen1 + passlen2;
1443
1444                 p += srvstr_pull_req_talloc(talloc_tos(), req, &tmp, p,
1445                                             STR_TERMINATE);
1446                 user = tmp ? tmp : "";
1447
1448                 p += srvstr_pull_req_talloc(talloc_tos(), req, &tmp, p,
1449                                             STR_TERMINATE);
1450                 domain = tmp ? tmp : "";
1451
1452                 p += srvstr_pull_req_talloc(talloc_tos(), req, &tmp, p,
1453                                             STR_TERMINATE);
1454                 native_os = tmp ? tmp : "";
1455
1456                 p += srvstr_pull_req_talloc(talloc_tos(), req, &tmp, p,
1457                                             STR_TERMINATE);
1458                 native_lanman = tmp ? tmp : "";
1459
1460                 /* not documented or decoded by Ethereal but there is one more
1461                  * string in the extra bytes which is the same as the
1462                  * PrimaryDomain when using extended security.  Windows NT 4
1463                  * and 2003 use this string to store the native lanman string.
1464                  * Windows 9x does not include a string here at all so we have
1465                  * to check if we have any extra bytes left */
1466
1467                 byte_count = SVAL(req->vwv+13, 0);
1468                 if ( PTR_DIFF(p, save_p) < byte_count) {
1469                         p += srvstr_pull_req_talloc(talloc_tos(), req, &tmp, p,
1470                                                     STR_TERMINATE);
1471                         primary_domain = tmp ? tmp : "";
1472                 } else {
1473                         primary_domain = talloc_strdup(talloc_tos(), "null");
1474                 }
1475
1476                 DEBUG(3,("Domain=[%s]  NativeOS=[%s] NativeLanMan=[%s] "
1477                         "PrimaryDomain=[%s]\n",
1478                         domain, native_os, native_lanman, primary_domain));
1479
1480                 if ( ra_type == RA_WIN2K ) {
1481                         if ( strlen(native_lanman) == 0 )
1482                                 ra_lanman_string( primary_domain );
1483                         else
1484                                 ra_lanman_string( native_lanman );
1485                 }
1486
1487         }
1488
1489         if (SVAL(req->vwv+4, 0) == 0) {
1490                 setup_new_vc_session(req->sconn);
1491         }
1492
1493         DEBUG(3,("sesssetupX:name=[%s]\\[%s]@[%s]\n",
1494                                 domain, user, get_remote_machine_name()));
1495
1496         if (*user) {
1497                 if (sconn->smb1.negprot.spnego) {
1498
1499                         /* This has to be here, because this is a perfectly
1500                          * valid behaviour for guest logons :-( */
1501
1502                         DEBUG(0,("reply_sesssetup_and_X:  Rejecting attempt "
1503                                 "at 'normal' session setup after "
1504                                 "negotiating spnego.\n"));
1505                         reply_nterror(req, nt_status_squash(
1506                                               NT_STATUS_LOGON_FAILURE));
1507                         END_PROFILE(SMBsesssetupX);
1508                         return;
1509                 }
1510                 fstrcpy(sub_user, user);
1511         } else {
1512                 fstrcpy(sub_user, lp_guestaccount());
1513         }
1514
1515         sub_set_smb_name(sub_user);
1516
1517         reload_services(sconn->msg_ctx, sconn->sock, True);
1518
1519         if (lp_security() == SEC_SHARE) {
1520                 char *sub_user_mapped = NULL;
1521                 /* In share level we should ignore any passwords */
1522
1523                 data_blob_free(&lm_resp);
1524                 data_blob_free(&nt_resp);
1525                 data_blob_clear_free(&plaintext_password);
1526
1527                 (void)map_username(talloc_tos(), sub_user, &sub_user_mapped);
1528                 if (!sub_user_mapped) {
1529                         reply_nterror(req, NT_STATUS_NO_MEMORY);
1530                         END_PROFILE(SMBsesssetupX);
1531                         return;
1532                 }
1533                 fstrcpy(sub_user, sub_user_mapped);
1534                 add_session_user(sconn, sub_user);
1535                 add_session_workgroup(sconn, domain);
1536                 /* Then force it to null for the benfit of the code below */
1537                 user = "";
1538         }
1539
1540         if (!*user) {
1541
1542                 nt_status = check_guest_password(sconn->remote_address, &server_info);
1543
1544         } else if (doencrypt) {
1545                 struct auth_context *negprot_auth_context = NULL;
1546                 negprot_auth_context = sconn->smb1.negprot.auth_context;
1547                 if (!negprot_auth_context) {
1548                         DEBUG(0, ("reply_sesssetup_and_X:  Attempted encrypted "
1549                                 "session setup without negprot denied!\n"));
1550                         reply_nterror(req, nt_status_squash(
1551                                               NT_STATUS_LOGON_FAILURE));
1552                         END_PROFILE(SMBsesssetupX);
1553                         return;
1554                 }
1555                 nt_status = make_user_info_for_reply_enc(&user_info, user,
1556                                                 domain,
1557                                                 sconn->remote_address,
1558                                                 lm_resp, nt_resp);
1559                 if (NT_STATUS_IS_OK(nt_status)) {
1560                         nt_status = negprot_auth_context->check_ntlm_password(
1561                                         negprot_auth_context,
1562                                         user_info,
1563                                         &server_info);
1564                 }
1565         } else {
1566                 struct auth_context *plaintext_auth_context = NULL;
1567
1568                 nt_status = make_auth_context_subsystem(
1569                         talloc_tos(), &plaintext_auth_context);
1570
1571                 if (NT_STATUS_IS_OK(nt_status)) {
1572                         uint8_t chal[8];
1573
1574                         plaintext_auth_context->get_ntlm_challenge(
1575                                         plaintext_auth_context, chal);
1576
1577                         if (!make_user_info_for_reply(&user_info,
1578                                                       user, domain,
1579                                                       sconn->remote_address,
1580                                                       chal,
1581                                                       plaintext_password)) {
1582                                 nt_status = NT_STATUS_NO_MEMORY;
1583                         }
1584
1585                         if (NT_STATUS_IS_OK(nt_status)) {
1586                                 nt_status = plaintext_auth_context->check_ntlm_password(
1587                                                 plaintext_auth_context,
1588                                                 user_info,
1589                                                 &server_info);
1590
1591                                 TALLOC_FREE(plaintext_auth_context);
1592                         }
1593                 }
1594         }
1595
1596         free_user_info(&user_info);
1597
1598         if (!NT_STATUS_IS_OK(nt_status)) {
1599                 nt_status = do_map_to_guest_server_info(nt_status, &server_info,
1600                                                         user, domain);
1601         }
1602
1603         if (!NT_STATUS_IS_OK(nt_status)) {
1604                 data_blob_free(&nt_resp);
1605                 data_blob_free(&lm_resp);
1606                 data_blob_clear_free(&plaintext_password);
1607                 reply_nterror(req, nt_status_squash(nt_status));
1608                 END_PROFILE(SMBsesssetupX);
1609                 return;
1610         }
1611
1612         nt_status = create_local_token(req, server_info, NULL, &session_info);
1613         TALLOC_FREE(server_info);
1614
1615         if (!NT_STATUS_IS_OK(nt_status)) {
1616                 DEBUG(10, ("create_local_token failed: %s\n",
1617                            nt_errstr(nt_status)));
1618                 data_blob_free(&nt_resp);
1619                 data_blob_free(&lm_resp);
1620                 data_blob_clear_free(&plaintext_password);
1621                 reply_nterror(req, nt_status_squash(nt_status));
1622                 END_PROFILE(SMBsesssetupX);
1623                 return;
1624         }
1625
1626         data_blob_clear_free(&plaintext_password);
1627
1628         /* it's ok - setup a reply */
1629         reply_outbuf(req, 3, 0);
1630         if (get_Protocol() >= PROTOCOL_NT1) {
1631                 push_signature(&req->outbuf);
1632                 /* perhaps grab OS version here?? */
1633         }
1634
1635         if (security_session_user_level(session_info, NULL) < SECURITY_USER) {
1636                 SSVAL(req->outbuf,smb_vwv2,1);
1637         }
1638
1639         /* register the name and uid as being validated, so further connections
1640            to a uid can get through without a password, on the same VC */
1641
1642         if (lp_security() == SEC_SHARE) {
1643                 sess_vuid = UID_FIELD_INVALID;
1644                 TALLOC_FREE(session_info);
1645         } else {
1646                 /* Ignore the initial vuid. */
1647                 sess_vuid = register_initial_vuid(sconn);
1648                 if (sess_vuid == UID_FIELD_INVALID) {
1649                         data_blob_free(&nt_resp);
1650                         data_blob_free(&lm_resp);
1651                         reply_nterror(req, nt_status_squash(
1652                                               NT_STATUS_LOGON_FAILURE));
1653                         END_PROFILE(SMBsesssetupX);
1654                         return;
1655                 }
1656                 /* register_existing_vuid keeps the session_info */
1657                 sess_vuid = register_existing_vuid(sconn, sess_vuid,
1658                                         session_info,
1659                                         nt_resp.data ? nt_resp : lm_resp,
1660                                         sub_user);
1661                 if (sess_vuid == UID_FIELD_INVALID) {
1662                         data_blob_free(&nt_resp);
1663                         data_blob_free(&lm_resp);
1664                         reply_nterror(req, nt_status_squash(
1665                                               NT_STATUS_LOGON_FAILURE));
1666                         END_PROFILE(SMBsesssetupX);
1667                         return;
1668                 }
1669
1670                 /* current_user_info is changed on new vuid */
1671                 reload_services(sconn->msg_ctx, sconn->sock, True);
1672         }
1673
1674         data_blob_free(&nt_resp);
1675         data_blob_free(&lm_resp);
1676
1677         SSVAL(req->outbuf,smb_uid,sess_vuid);
1678         SSVAL(discard_const_p(char, req->inbuf),smb_uid,sess_vuid);
1679         req->vuid = sess_vuid;
1680
1681         if (!sconn->smb1.sessions.done_sesssetup) {
1682                 sconn->smb1.sessions.max_send =
1683                         MIN(sconn->smb1.sessions.max_send,smb_bufsize);
1684         }
1685         sconn->smb1.sessions.done_sesssetup = true;
1686
1687         END_PROFILE(SMBsesssetupX);
1688         chain_reply(req);
1689         return;
1690 }