source4/smb_server/smb/negprot.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    negprot reply code
   4    Copyright (C) Andrew Tridgell 1992-1998
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #include "includes.h"
  21 #include "auth/credentials/credentials.h"
  22 #include "auth/gensec/gensec.h"
  23 #include "auth/auth.h"
  24 #include "smb_server/smb_server.h"
  25 #include "libcli/smb2/smb2.h"
  26 #include "smb_server/smb2/smb2_server.h"
  27 #include "smb_server/service_smb_proto.h"
  28 #include "smbd/service_stream.h"
  29 #include "lib/stream/packet.h"
  30
  31
  32 /* initialise the auth_context for this server and return the cryptkey */
  33 static NTSTATUS get_challenge(struct smbsrv_connection *smb_conn, uint8_t buff[8])
  34 {
  35         NTSTATUS nt_status;
  36         const uint8_t *challenge;
  37
  38         /* muliple negprots are not premitted */
  39         if (smb_conn->negotiate.auth_context) {
  40                 DEBUG(3,("get challenge: is this a secondary negprot?  auth_context is non-NULL!\n"));
  41                 return NT_STATUS_FOOBAR;
  42         }
  43
  44         DEBUG(10, ("get challenge: creating negprot_global_auth_context\n"));
  45
  46         nt_status = auth_context_create(smb_conn,
  47                                         smb_conn->connection->event.ctx,
  48                                         smb_conn->connection->msg_ctx,
  49                                         &smb_conn->negotiate.auth_context);
  50         if (!NT_STATUS_IS_OK(nt_status)) {
  51                 DEBUG(0, ("auth_context_create() returned %s", nt_errstr(nt_status)));
  52                 return nt_status;
  53         }
  54
  55         nt_status = auth_get_challenge(smb_conn->negotiate.auth_context, &challenge);
  56         if (!NT_STATUS_IS_OK(nt_status)) {
  57                 DEBUG(0, ("auth_get_challenge() returned %s", nt_errstr(nt_status)));
  58                 return nt_status;
  59         }
  60
  61         memcpy(buff, challenge, 8);
  62
  63         return NT_STATUS_OK;
  64 }
  65
  66 /****************************************************************************
  67  Reply for the core protocol.
  68 ****************************************************************************/
  69 static void reply_corep(struct smbsrv_request *req, uint16_t choice)
  70 {
  71         smbsrv_setup_reply(req, 1, 0);
  72
  73         SSVAL(req->out.vwv, VWV(0), choice);
  74
  75         req->smb_conn->negotiate.protocol = PROTOCOL_CORE;
  76
  77         if (req->smb_conn->signing.mandatory_signing) {
  78                 smbsrv_terminate_connection(req->smb_conn,
  79                                             "CORE does not support SMB signing, and it is mandatory\n");
  80                 return;
  81         }
  82
  83         smbsrv_send_reply(req);
  84 }
  85
  86 /****************************************************************************
  87  Reply for the coreplus protocol.
  88 this is quite incomplete - we only fill in a small part of the reply, but as nobody uses
  89 this any more it probably doesn't matter
  90 ****************************************************************************/
  91 static void reply_coreplus(struct smbsrv_request *req, uint16_t choice)
  92 {
  93         uint16_t raw = (lp_readraw()?1:0) | (lp_writeraw()?2:0);
  94
  95         smbsrv_setup_reply(req, 13, 0);
  96
  97         /* Reply, SMBlockread, SMBwritelock supported. */
  98         SCVAL(req->out.hdr,HDR_FLG,
  99               CVAL(req->out.hdr, HDR_FLG) | FLAG_SUPPORT_LOCKREAD);
 100
 101         SSVAL(req->out.vwv, VWV(0), choice);
 102         SSVAL(req->out.vwv, VWV(1), 0x1); /* user level security, don't encrypt */
 103
 104         /* tell redirector we support
 105            readbraw and writebraw (possibly) */
 106         SSVAL(req->out.vwv, VWV(5), raw);
 107
 108         req->smb_conn->negotiate.protocol = PROTOCOL_COREPLUS;
 109
 110         if (req->smb_conn->signing.mandatory_signing) {
 111                 smbsrv_terminate_connection(req->smb_conn,
 112                                             "COREPLUS does not support SMB signing, and it is mandatory\n");
 113                 return;
 114         }
 115
 116         smbsrv_send_reply(req);
 117 }
 118
 119 /****************************************************************************
 120  Reply for the lanman 1.0 protocol.
 121 ****************************************************************************/
 122 static void reply_lanman1(struct smbsrv_request *req, uint16_t choice)
 123 {
 124         int raw = (lp_readraw()?1:0) | (lp_writeraw()?2:0);
 125         int secword=0;
 126         time_t t = req->request_time.tv_sec;
 127
 128         req->smb_conn->negotiate.encrypted_passwords = lp_encrypted_passwords();
 129
 130         if (lp_security() != SEC_SHARE)
 131                 secword |= NEGOTIATE_SECURITY_USER_LEVEL;
 132
 133         if (req->smb_conn->negotiate.encrypted_passwords)
 134                 secword |= NEGOTIATE_SECURITY_CHALLENGE_RESPONSE;
 135
 136         req->smb_conn->negotiate.protocol = PROTOCOL_LANMAN1;
 137
 138         smbsrv_setup_reply(req, 13, req->smb_conn->negotiate.encrypted_passwords ? 8 : 0);
 139
 140         /* SMBlockread, SMBwritelock supported. */
 141         SCVAL(req->out.hdr,HDR_FLG,
 142               CVAL(req->out.hdr, HDR_FLG) | FLAG_SUPPORT_LOCKREAD);
 143
 144         SSVAL(req->out.vwv, VWV(0), choice);
 145         SSVAL(req->out.vwv, VWV(1), secword);
 146         SSVAL(req->out.vwv, VWV(2), req->smb_conn->negotiate.max_recv);
 147         SSVAL(req->out.vwv, VWV(3), lp_maxmux());
 148         SSVAL(req->out.vwv, VWV(4), 1);
 149         SSVAL(req->out.vwv, VWV(5), raw);
 150         SIVAL(req->out.vwv, VWV(6), req->smb_conn->connection->server_id.id);
 151         srv_push_dos_date(req->smb_conn, req->out.vwv, VWV(8), t);
 152         SSVAL(req->out.vwv, VWV(10), req->smb_conn->negotiate.zone_offset/60);
 153         SIVAL(req->out.vwv, VWV(11), 0); /* reserved */
 154
 155         /* Create a token value and add it to the outgoing packet. */
 156         if (req->smb_conn->negotiate.encrypted_passwords) {
 157                 NTSTATUS nt_status;
 158
 159                 SSVAL(req->out.vwv, VWV(11), 8);
 160
 161                 nt_status = get_challenge(req->smb_conn, req->out.data);
 162                 if (!NT_STATUS_IS_OK(nt_status)) {
 163                         smbsrv_terminate_connection(req->smb_conn, "LANMAN1 get_challenge failed\n");
 164                         return;
 165                 }
 166         }
 167
 168         if (req->smb_conn->signing.mandatory_signing) {
 169                 smbsrv_terminate_connection(req->smb_conn,
 170                                             "LANMAN1 does not support SMB signing, and it is mandatory\n");
 171                 return;
 172         }
 173
 174         smbsrv_send_reply(req);
 175 }
 176
 177 /****************************************************************************
 178  Reply for the lanman 2.0 protocol.
 179 ****************************************************************************/
 180 static void reply_lanman2(struct smbsrv_request *req, uint16_t choice)
 181 {
 182         int raw = (lp_readraw()?1:0) | (lp_writeraw()?2:0);
 183         int secword=0;
 184         time_t t = req->request_time.tv_sec;
 185
 186         req->smb_conn->negotiate.encrypted_passwords = lp_encrypted_passwords();
 187
 188         if (lp_security() != SEC_SHARE)
 189                 secword |= NEGOTIATE_SECURITY_USER_LEVEL;
 190
 191         if (req->smb_conn->negotiate.encrypted_passwords)
 192                 secword |= NEGOTIATE_SECURITY_CHALLENGE_RESPONSE;
 193
 194         req->smb_conn->negotiate.protocol = PROTOCOL_LANMAN2;
 195
 196         smbsrv_setup_reply(req, 13, 0);
 197
 198         SSVAL(req->out.vwv, VWV(0), choice);
 199         SSVAL(req->out.vwv, VWV(1), secword);
 200         SSVAL(req->out.vwv, VWV(2), req->smb_conn->negotiate.max_recv);
 201         SSVAL(req->out.vwv, VWV(3), lp_maxmux());
 202         SSVAL(req->out.vwv, VWV(4), 1);
 203         SSVAL(req->out.vwv, VWV(5), raw);
 204         SIVAL(req->out.vwv, VWV(6), req->smb_conn->connection->server_id.id);
 205         srv_push_dos_date(req->smb_conn, req->out.vwv, VWV(8), t);
 206         SSVAL(req->out.vwv, VWV(10), req->smb_conn->negotiate.zone_offset/60);
 207         SIVAL(req->out.vwv, VWV(11), 0);
 208
 209         /* Create a token value and add it to the outgoing packet. */
 210         if (req->smb_conn->negotiate.encrypted_passwords) {
 211                 SSVAL(req->out.vwv, VWV(11), 8);
 212                 req_grow_data(req, 8);
 213                 get_challenge(req->smb_conn, req->out.data);
 214         }
 215
 216         req_push_str(req, NULL, lp_workgroup(), -1, STR_TERMINATE);
 217
 218         if (req->smb_conn->signing.mandatory_signing) {
 219                 smbsrv_terminate_connection(req->smb_conn,
 220                                             "LANMAN2 does not support SMB signing, and it is mandatory\n");
 221                 return;
 222         }
 223
 224         smbsrv_send_reply(req);
 225 }
 226
 227 static void reply_nt1_orig(struct smbsrv_request *req)
 228 {
 229         /* Create a token value and add it to the outgoing packet. */
 230         if (req->smb_conn->negotiate.encrypted_passwords) {
 231                 req_grow_data(req, 8);
 232                 /* note that we do not send a challenge at all if
 233                    we are using plaintext */
 234                 get_challenge(req->smb_conn, req->out.ptr);
 235                 req->out.ptr += 8;
 236                 SCVAL(req->out.vwv+1, VWV(16), 8);
 237         }
 238         req_push_str(req, NULL, lp_workgroup(), -1, STR_UNICODE|STR_TERMINATE|STR_NOALIGN);
 239         req_push_str(req, NULL, lp_netbios_name(), -1, STR_UNICODE|STR_TERMINATE|STR_NOALIGN);
 240         DEBUG(3,("not using extended security (SPNEGO or NTLMSSP)\n"));
 241 }
 242
 243 /****************************************************************************
 244  Reply for the nt protocol.
 245 ****************************************************************************/
 246 static void reply_nt1(struct smbsrv_request *req, uint16_t choice)
 247 {
 248         /* dual names + lock_and_read + nt SMBs + remote API calls */
 249         int capabilities;
 250         int secword=0;
 251         time_t t = req->request_time.tv_sec;
 252         NTTIME nttime;
 253         BOOL negotiate_spnego = False;
 254         char *large_test_path;
 255
 256         unix_to_nt_time(&nttime, t);
 257
 258         capabilities =
 259                 CAP_NT_FIND | CAP_LOCK_AND_READ |
 260                 CAP_LEVEL_II_OPLOCKS | CAP_NT_SMBS | CAP_RPC_REMOTE_APIS;
 261
 262         req->smb_conn->negotiate.encrypted_passwords = lp_encrypted_passwords();
 263
 264         /* do spnego in user level security if the client
 265            supports it and we can do encrypted passwords */
 266
 267         if (req->smb_conn->negotiate.encrypted_passwords &&
 268             (lp_security() != SEC_SHARE) &&
 269             lp_use_spnego() &&
 270             (req->flags2 & FLAGS2_EXTENDED_SECURITY)) {
 271                 negotiate_spnego = True;
 272                 capabilities |= CAP_EXTENDED_SECURITY;
 273         }
 274
 275         if (lp_unix_extensions()) {
 276                 capabilities |= CAP_UNIX;
 277         }
 278
 279         if (lp_large_readwrite()) {
 280                 capabilities |= CAP_LARGE_READX | CAP_LARGE_WRITEX | CAP_W2K_SMBS;
 281         }
 282
 283         large_test_path = lock_path(req, "large_test.dat");
 284         if (large_file_support(large_test_path)) {
 285                 capabilities |= CAP_LARGE_FILES;
 286         }
 287
 288         if (lp_readraw() && lp_writeraw()) {
 289                 capabilities |= CAP_RAW_MODE;
 290         }
 291
 292         /* allow for disabling unicode */
 293         if (lp_unicode()) {
 294                 capabilities |= CAP_UNICODE;
 295         }
 296
 297         if (lp_nt_status_support()) {
 298                 capabilities |= CAP_STATUS32;
 299         }
 300
 301         if (lp_host_msdfs()) {
 302                 capabilities |= CAP_DFS;
 303         }
 304
 305         if (lp_security() != SEC_SHARE) {
 306                 secword |= NEGOTIATE_SECURITY_USER_LEVEL;
 307         }
 308
 309         if (req->smb_conn->negotiate.encrypted_passwords) {
 310                 secword |= NEGOTIATE_SECURITY_CHALLENGE_RESPONSE;
 311         }
 312
 313         if (req->smb_conn->signing.allow_smb_signing) {
 314                 secword |= NEGOTIATE_SECURITY_SIGNATURES_ENABLED;
 315         }
 316
 317         if (req->smb_conn->signing.mandatory_signing) {
 318                 secword |= NEGOTIATE_SECURITY_SIGNATURES_REQUIRED;
 319         }
 320
 321         req->smb_conn->negotiate.protocol = PROTOCOL_NT1;
 322
 323         smbsrv_setup_reply(req, 17, 0);
 324
 325         SSVAL(req->out.vwv, VWV(0), choice);
 326         SCVAL(req->out.vwv, VWV(1), secword);
 327
 328         /* notice the strange +1 on vwv here? That's because
 329            this is the one and only SMB packet that is malformed in
 330            the specification - all the command words after the secword
 331            are offset by 1 byte */
 332         SSVAL(req->out.vwv+1, VWV(1), lp_maxmux());
 333         SSVAL(req->out.vwv+1, VWV(2), 1); /* num vcs */
 334         SIVAL(req->out.vwv+1, VWV(3), req->smb_conn->negotiate.max_recv);
 335         SIVAL(req->out.vwv+1, VWV(5), 0x10000); /* raw size. full 64k */
 336         SIVAL(req->out.vwv+1, VWV(7), req->smb_conn->connection->server_id.id); /* session key */
 337         SIVAL(req->out.vwv+1, VWV(9), capabilities);
 338         push_nttime(req->out.vwv+1, VWV(11), nttime);
 339         SSVALS(req->out.vwv+1,VWV(15), req->smb_conn->negotiate.zone_offset/60);
 340
 341         if (!negotiate_spnego) {
 342                 reply_nt1_orig(req);
 343         } else {
 344                 struct cli_credentials *server_credentials;
 345                 struct gensec_security *gensec_security;
 346                 DATA_BLOB null_data_blob = data_blob(NULL, 0);
 347                 DATA_BLOB blob;
 348                 const char *oid;
 349                 NTSTATUS nt_status;
 350
 351                 nt_status = gensec_server_start(req->smb_conn,
 352                                                 req->smb_conn->connection->event.ctx,
 353                                                 req->smb_conn->connection->msg_ctx,
 354                                                 &gensec_security);
 355                 if (!NT_STATUS_IS_OK(nt_status)) {
 356                         DEBUG(0, ("Failed to start GENSEC: %s\n", nt_errstr(nt_status)));
 357                         smbsrv_terminate_connection(req->smb_conn, "Failed to start GENSEC\n");
 358                         return;
 359                 }
 360
 361                 if (req->smb_conn->negotiate.auth_context) {
 362                         smbsrv_terminate_connection(req->smb_conn, "reply_nt1: is this a secondary negprot?  auth_context is non-NULL!\n");
 363                         return;
 364                 }
 365
 366                 server_credentials
 367                         = cli_credentials_init(req);
 368                 if (!server_credentials) {
 369                         smbsrv_terminate_connection(req->smb_conn, "Failed to init server credentials\n");
 370                         return;
 371                 }
 372
 373                 cli_credentials_set_conf(server_credentials);
 374                 nt_status = cli_credentials_set_machine_account(server_credentials);
 375                 if (!NT_STATUS_IS_OK(nt_status)) {
 376                         DEBUG(10, ("Failed to obtain server credentials, perhaps a standalone server?: %s\n", nt_errstr(nt_status)));
 377                         talloc_free(server_credentials);
 378                         server_credentials = NULL;
 379                 }
 380
 381                 req->smb_conn->negotiate.server_credentials = talloc_steal(req->smb_conn, server_credentials);
 382
 383                 gensec_set_target_service(gensec_security, "cifs");
 384
 385                 gensec_set_credentials(gensec_security, server_credentials);
 386
 387                 oid = GENSEC_OID_SPNEGO;
 388                 nt_status = gensec_start_mech_by_oid(gensec_security, oid);
 389
 390                 if (NT_STATUS_IS_OK(nt_status)) {
 391                         /* Get and push the proposed OID list into the packets */
 392                         nt_status = gensec_update(gensec_security, req, null_data_blob, &blob);
 393
 394                         if (!NT_STATUS_IS_OK(nt_status) && !NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 395                                 DEBUG(1, ("Failed to get SPNEGO to give us the first token: %s\n", nt_errstr(nt_status)));
 396                         }
 397                 }
 398
 399                 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 400                         DEBUG(3,("using SPNEGO\n"));
 401                 } else {
 402                         DEBUG(5, ("Failed to start SPNEGO, falling back to NTLMSSP only: %s\n", nt_errstr(nt_status)));
 403                         oid = GENSEC_OID_NTLMSSP;
 404                         nt_status = gensec_start_mech_by_oid(gensec_security, oid);
 405
 406                         if (!NT_STATUS_IS_OK(nt_status)) {
 407                                 DEBUG(0, ("Failed to start SPNEGO as well as NTLMSSP fallback: %s\n", nt_errstr(nt_status)));
 408                                 reply_nt1_orig(req);
 409                                 return;
 410                         }
 411                         /* NTLMSSP is a client-first exchange */
 412                         blob = data_blob(NULL, 0);
 413                         DEBUG(3,("using raw-NTLMSSP\n"));
 414                 }
 415
 416                 req->smb_conn->negotiate.oid = oid;
 417
 418                 req_grow_data(req, blob.length + 16);
 419                 /* a NOT very random guid, perhaps we should get it
 420                  * from the credentials (kitchen sink...) */
 421                 memset(req->out.ptr, '\0', 16);
 422                 req->out.ptr += 16;
 423
 424                 memcpy(req->out.ptr, blob.data, blob.length);
 425                 SCVAL(req->out.vwv+1, VWV(16), blob.length + 16);
 426                 req->out.ptr += blob.length;
 427         }
 428
 429         smbsrv_send_reply_nosign(req);
 430 }
 431
 432 /****************************************************************************
 433  Reply for the SMB2 2.001 protocol
 434 ****************************************************************************/
 435 static void reply_smb2(struct smbsrv_request *req, uint16_t choice)
 436 {
 437         struct smbsrv_connection *smb_conn = req->smb_conn;
 438         NTSTATUS status;
 439
 440         talloc_free(smb_conn->sessions.idtree_vuid);
 441         ZERO_STRUCT(smb_conn->sessions);
 442         talloc_free(smb_conn->smb_tcons.idtree_tid);
 443         ZERO_STRUCT(smb_conn->smb_tcons);
 444         ZERO_STRUCT(smb_conn->signing);
 445
 446         /* reply with a SMB2 packet */
 447         status = smbsrv_init_smb2_connection(smb_conn);
 448         if (!NT_STATUS_IS_OK(status)) {
 449                 smbsrv_terminate_connection(smb_conn, nt_errstr(status));
 450                 talloc_free(req);
 451                 return;
 452         }
 453         packet_set_callback(smb_conn->packet, smbsrv_recv_smb2_request);
 454         smb2srv_reply_smb_negprot(req);
 455         req = NULL;
 456 }
 457
 458 /* List of supported protocols, most desired first */
 459 static const struct {
 460         const char *proto_name;
 461         const char *short_name;
 462         void (*proto_reply_fn)(struct smbsrv_request *req, uint16_t choice);
 463         int protocol_level;
 464 } supported_protocols[] = {
 465         {"SMB 2.001",                   "SMB2",         reply_smb2,     PROTOCOL_SMB2},
 466         {"NT LANMAN 1.0",               "NT1",          reply_nt1,      PROTOCOL_NT1},
 467         {"NT LM 0.12",                  "NT1",          reply_nt1,      PROTOCOL_NT1},
 468         {"LANMAN2.1",                   "LANMAN2",      reply_lanman2,  PROTOCOL_LANMAN2},
 469         {"LM1.2X002",                   "LANMAN2",      reply_lanman2,  PROTOCOL_LANMAN2},
 470         {"Samba",                       "LANMAN2",      reply_lanman2,  PROTOCOL_LANMAN2},
 471         {"DOS LM1.2X002",               "LANMAN2",      reply_lanman2,  PROTOCOL_LANMAN2},
 472         {"Windows for Workgroups 3.1a", "LANMAN1",      reply_lanman1,  PROTOCOL_LANMAN1},
 473         {"LANMAN1.0",                   "LANMAN1",      reply_lanman1,  PROTOCOL_LANMAN1},
 474         {"MICROSOFT NETWORKS 3.0",      "LANMAN1",      reply_lanman1,  PROTOCOL_LANMAN1},
 475         {"MICROSOFT NETWORKS 1.03",     "COREPLUS",     reply_coreplus, PROTOCOL_COREPLUS},
 476         {"PC NETWORK PROGRAM 1.0",      "CORE",         reply_corep,    PROTOCOL_CORE},
 477         {NULL,NULL,NULL,0},
 478 };
 479
 480 /****************************************************************************
 481  Reply to a negprot.
 482 ****************************************************************************/
 483
 484 void smbsrv_reply_negprot(struct smbsrv_request *req)
 485 {
 486         int protocol;
 487         uint8_t *p;
 488         uint32_t protos_count = 0;
 489         char **protos = NULL;
 490
 491         if (req->smb_conn->negotiate.done_negprot) {
 492                 smbsrv_terminate_connection(req->smb_conn, "multiple negprot's are not permitted");
 493                 return;
 494         }
 495         req->smb_conn->negotiate.done_negprot = True;
 496
 497         p = req->in.data;
 498         while (True) {
 499                 size_t len;
 500
 501                 protos = talloc_realloc(req, protos, char *, protos_count + 1);
 502                 if (!protos) {
 503                         smbsrv_terminate_connection(req->smb_conn, nt_errstr(NT_STATUS_NO_MEMORY));
 504                         return;
 505                 }
 506                 protos[protos_count] = NULL;
 507                 len = req_pull_ascii4(req, (const char **)&protos[protos_count], p, STR_ASCII|STR_TERMINATE);
 508                 p += len;
 509                 if (len == 0 || !protos[protos_count]) break;
 510
 511                 DEBUG(5,("Requested protocol [%d][%s]\n", protos_count, protos[protos_count]));
 512                 protos_count++;
 513         }
 514
 515         /* Check for protocols, most desirable first */
 516         for (protocol = 0; supported_protocols[protocol].proto_name; protocol++) {
 517                 int i;
 518
 519                 if (supported_protocols[protocol].protocol_level > lp_srv_maxprotocol()) continue;
 520                 if (supported_protocols[protocol].protocol_level < lp_srv_minprotocol()) continue;
 521
 522                 for (i = 0; i < protos_count; i++) {
 523                         if (strcmp(supported_protocols[protocol].proto_name, protos[i]) != 0) continue;
 524
 525                         supported_protocols[protocol].proto_reply_fn(req, i);
 526                         DEBUG(3,("Selected protocol [%d][%s]\n",
 527                                 i, supported_protocols[protocol].proto_name));
 528                         return;
 529                 }
 530         }
 531
 532         smbsrv_terminate_connection(req->smb_conn, "No protocol supported !");
 533 }