source/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 #include "param/param.h"
  31
  32
  33 /* initialise the auth_context for this server and return the cryptkey */
  34 static NTSTATUS get_challenge(struct smbsrv_connection *smb_conn, uint8_t buff[8])
  35 {
  36         NTSTATUS nt_status;
  37         const uint8_t *challenge;
  38
  39         /* muliple negprots are not premitted */
  40         if (smb_conn->negotiate.auth_context) {
  41                 DEBUG(3,("get challenge: is this a secondary negprot?  auth_context is non-NULL!\n"));
  42                 return NT_STATUS_FOOBAR;
  43         }
  44
  45         DEBUG(10, ("get challenge: creating negprot_global_auth_context\n"));
  46
  47         nt_status = auth_context_create(smb_conn,
  48                                         smb_conn->connection->event.ctx,
  49                                         smb_conn->connection->msg_ctx,
  50                                         &smb_conn->negotiate.auth_context);
  51         if (!NT_STATUS_IS_OK(nt_status)) {
  52                 DEBUG(0, ("auth_context_create() returned %s", nt_errstr(nt_status)));
  53                 return nt_status;
  54         }
  55
  56         nt_status = auth_get_challenge(smb_conn->negotiate.auth_context, &challenge);
  57         if (!NT_STATUS_IS_OK(nt_status)) {
  58                 DEBUG(0, ("auth_get_challenge() returned %s", nt_errstr(nt_status)));
  59                 return nt_status;
  60         }
  61
  62         memcpy(buff, challenge, 8);
  63
  64         return NT_STATUS_OK;
  65 }
  66
  67 /****************************************************************************
  68  Reply for the core protocol.
  69 ****************************************************************************/
  70 static void reply_corep(struct smbsrv_request *req, uint16_t choice)
  71 {
  72         smbsrv_setup_reply(req, 1, 0);
  73
  74         SSVAL(req->out.vwv, VWV(0), choice);
  75
  76         req->smb_conn->negotiate.protocol = PROTOCOL_CORE;
  77
  78         if (req->smb_conn->signing.mandatory_signing) {
  79                 smbsrv_terminate_connection(req->smb_conn,
  80                                             "CORE does not support SMB signing, and it is mandatory\n");
  81                 return;
  82         }
  83
  84         smbsrv_send_reply(req);
  85 }
  86
  87 /****************************************************************************
  88  Reply for the coreplus protocol.
  89 this is quite incomplete - we only fill in a small part of the reply, but as nobody uses
  90 this any more it probably doesn't matter
  91 ****************************************************************************/
  92 static void reply_coreplus(struct smbsrv_request *req, uint16_t choice)
  93 {
  94         uint16_t raw = (lp_readraw(global_loadparm)?1:0) | (lp_writeraw(global_loadparm)?2:0);
  95
  96         smbsrv_setup_reply(req, 13, 0);
  97
  98         /* Reply, SMBlockread, SMBwritelock supported. */
  99         SCVAL(req->out.hdr,HDR_FLG,
 100               CVAL(req->out.hdr, HDR_FLG) | FLAG_SUPPORT_LOCKREAD);
 101
 102         SSVAL(req->out.vwv, VWV(0), choice);
 103         SSVAL(req->out.vwv, VWV(1), 0x1); /* user level security, don't encrypt */
 104
 105         /* tell redirector we support
 106            readbraw and writebraw (possibly) */
 107         SSVAL(req->out.vwv, VWV(5), raw);
 108
 109         req->smb_conn->negotiate.protocol = PROTOCOL_COREPLUS;
 110
 111         if (req->smb_conn->signing.mandatory_signing) {
 112                 smbsrv_terminate_connection(req->smb_conn,
 113                                             "COREPLUS does not support SMB signing, and it is mandatory\n");
 114                 return;
 115         }
 116
 117         smbsrv_send_reply(req);
 118 }
 119
 120 /****************************************************************************
 121  Reply for the lanman 1.0 protocol.
 122 ****************************************************************************/
 123 static void reply_lanman1(struct smbsrv_request *req, uint16_t choice)
 124 {
 125         int raw = (lp_readraw(global_loadparm)?1:0) | (lp_writeraw(global_loadparm)?2:0);
 126         int secword=0;
 127         time_t t = req->request_time.tv_sec;
 128
 129         req->smb_conn->negotiate.encrypted_passwords = lp_encrypted_passwords(global_loadparm);
 130
 131         if (lp_security(global_loadparm) != SEC_SHARE)
 132                 secword |= NEGOTIATE_SECURITY_USER_LEVEL;
 133
 134         if (req->smb_conn->negotiate.encrypted_passwords)
 135                 secword |= NEGOTIATE_SECURITY_CHALLENGE_RESPONSE;
 136
 137         req->smb_conn->negotiate.protocol = PROTOCOL_LANMAN1;
 138
 139         smbsrv_setup_reply(req, 13, req->smb_conn->negotiate.encrypted_passwords ? 8 : 0);
 140
 141         /* SMBlockread, SMBwritelock supported. */
 142         SCVAL(req->out.hdr,HDR_FLG,
 143               CVAL(req->out.hdr, HDR_FLG) | FLAG_SUPPORT_LOCKREAD);
 144
 145         SSVAL(req->out.vwv, VWV(0), choice);
 146         SSVAL(req->out.vwv, VWV(1), secword);
 147         SSVAL(req->out.vwv, VWV(2), req->smb_conn->negotiate.max_recv);
 148         SSVAL(req->out.vwv, VWV(3), lp_maxmux(global_loadparm));
 149         SSVAL(req->out.vwv, VWV(4), 1);
 150         SSVAL(req->out.vwv, VWV(5), raw);
 151         SIVAL(req->out.vwv, VWV(6), req->smb_conn->connection->server_id.id);
 152         srv_push_dos_date(req->smb_conn, req->out.vwv, VWV(8), t);
 153         SSVAL(req->out.vwv, VWV(10), req->smb_conn->negotiate.zone_offset/60);
 154         SIVAL(req->out.vwv, VWV(11), 0); /* reserved */
 155
 156         /* Create a token value and add it to the outgoing packet. */
 157         if (req->smb_conn->negotiate.encrypted_passwords) {
 158                 NTSTATUS nt_status;
 159
 160                 SSVAL(req->out.vwv, VWV(11), 8);
 161
 162                 nt_status = get_challenge(req->smb_conn, req->out.data);
 163                 if (!NT_STATUS_IS_OK(nt_status)) {
 164                         smbsrv_terminate_connection(req->smb_conn, "LANMAN1 get_challenge failed\n");
 165                         return;
 166                 }
 167         }
 168
 169         if (req->smb_conn->signing.mandatory_signing) {
 170                 smbsrv_terminate_connection(req->smb_conn,
 171                                             "LANMAN1 does not support SMB signing, and it is mandatory\n");
 172                 return;
 173         }
 174
 175         smbsrv_send_reply(req);
 176 }
 177
 178 /****************************************************************************
 179  Reply for the lanman 2.0 protocol.
 180 ****************************************************************************/
 181 static void reply_lanman2(struct smbsrv_request *req, uint16_t choice)
 182 {
 183         int raw = (lp_readraw(global_loadparm)?1:0) | (lp_writeraw(global_loadparm)?2:0);
 184         int secword=0;
 185         time_t t = req->request_time.tv_sec;
 186
 187         req->smb_conn->negotiate.encrypted_passwords = lp_encrypted_passwords(global_loadparm);
 188
 189         if (lp_security(global_loadparm) != SEC_SHARE)
 190                 secword |= NEGOTIATE_SECURITY_USER_LEVEL;
 191
 192         if (req->smb_conn->negotiate.encrypted_passwords)
 193                 secword |= NEGOTIATE_SECURITY_CHALLENGE_RESPONSE;
 194
 195         req->smb_conn->negotiate.protocol = PROTOCOL_LANMAN2;
 196
 197         smbsrv_setup_reply(req, 13, 0);
 198
 199         SSVAL(req->out.vwv, VWV(0), choice);
 200         SSVAL(req->out.vwv, VWV(1), secword);
 201         SSVAL(req->out.vwv, VWV(2), req->smb_conn->negotiate.max_recv);
 202         SSVAL(req->out.vwv, VWV(3), lp_maxmux(global_loadparm));
 203         SSVAL(req->out.vwv, VWV(4), 1);
 204         SSVAL(req->out.vwv, VWV(5), raw);
 205         SIVAL(req->out.vwv, VWV(6), req->smb_conn->connection->server_id.id);
 206         srv_push_dos_date(req->smb_conn, req->out.vwv, VWV(8), t);
 207         SSVAL(req->out.vwv, VWV(10), req->smb_conn->negotiate.zone_offset/60);
 208         SIVAL(req->out.vwv, VWV(11), 0);
 209
 210         /* Create a token value and add it to the outgoing packet. */
 211         if (req->smb_conn->negotiate.encrypted_passwords) {
 212                 SSVAL(req->out.vwv, VWV(11), 8);
 213                 req_grow_data(req, 8);
 214                 get_challenge(req->smb_conn, req->out.data);
 215         }
 216
 217         req_push_str(req, NULL, lp_workgroup(global_loadparm), -1, STR_TERMINATE);
 218
 219         if (req->smb_conn->signing.mandatory_signing) {
 220                 smbsrv_terminate_connection(req->smb_conn,
 221                                             "LANMAN2 does not support SMB signing, and it is mandatory\n");
 222                 return;
 223         }
 224
 225         smbsrv_send_reply(req);
 226 }
 227
 228 static void reply_nt1_orig(struct smbsrv_request *req)
 229 {
 230         /* Create a token value and add it to the outgoing packet. */
 231         if (req->smb_conn->negotiate.encrypted_passwords) {
 232                 req_grow_data(req, 8);
 233                 /* note that we do not send a challenge at all if
 234                    we are using plaintext */
 235                 get_challenge(req->smb_conn, req->out.ptr);
 236                 req->out.ptr += 8;
 237                 SCVAL(req->out.vwv+1, VWV(16), 8);
 238         }
 239         req_push_str(req, NULL, lp_workgroup(global_loadparm), -1, STR_UNICODE|STR_TERMINATE|STR_NOALIGN);
 240         req_push_str(req, NULL, lp_netbios_name(global_loadparm), -1, STR_UNICODE|STR_TERMINATE|STR_NOALIGN);
 241         DEBUG(3,("not using extended security (SPNEGO or NTLMSSP)\n"));
 242 }
 243
 244 /****************************************************************************
 245  Reply for the nt protocol.
 246 ****************************************************************************/
 247 static void reply_nt1(struct smbsrv_request *req, uint16_t choice)
 248 {
 249         /* dual names + lock_and_read + nt SMBs + remote API calls */
 250         int capabilities;
 251         int secword=0;
 252         time_t t = req->request_time.tv_sec;
 253         NTTIME nttime;
 254         bool negotiate_spnego = false;
 255         char *large_test_path;
 256
 257         unix_to_nt_time(&nttime, t);
 258
 259         capabilities =
 260                 CAP_NT_FIND | CAP_LOCK_AND_READ |
 261                 CAP_LEVEL_II_OPLOCKS | CAP_NT_SMBS | CAP_RPC_REMOTE_APIS;
 262
 263         req->smb_conn->negotiate.encrypted_passwords = lp_encrypted_passwords(global_loadparm);
 264
 265         /* do spnego in user level security if the client
 266            supports it and we can do encrypted passwords */
 267
 268         if (req->smb_conn->negotiate.encrypted_passwords &&
 269             (lp_security(global_loadparm) != SEC_SHARE) &&
 270             lp_use_spnego(global_loadparm) &&
 271             (req->flags2 & FLAGS2_EXTENDED_SECURITY)) {
 272                 negotiate_spnego = true;
 273                 capabilities |= CAP_EXTENDED_SECURITY;
 274         }
 275
 276         if (lp_unix_extensions(global_loadparm)) {
 277                 capabilities |= CAP_UNIX;
 278         }
 279
 280         if (lp_large_readwrite(global_loadparm)) {
 281                 capabilities |= CAP_LARGE_READX | CAP_LARGE_WRITEX | CAP_W2K_SMBS;
 282         }
 283
 284         large_test_path = lock_path(req, global_loadparm, "large_test.dat");
 285         if (large_file_support(large_test_path)) {
 286                 capabilities |= CAP_LARGE_FILES;
 287         }
 288
 289         if (lp_readraw(global_loadparm) && lp_writeraw(global_loadparm)) {
 290                 capabilities |= CAP_RAW_MODE;
 291         }
 292
 293         /* allow for disabling unicode */
 294         if (lp_unicode(global_loadparm)) {
 295                 capabilities |= CAP_UNICODE;
 296         }
 297
 298         if (lp_nt_status_support(global_loadparm)) {
 299                 capabilities |= CAP_STATUS32;
 300         }
 301
 302         if (lp_host_msdfs(global_loadparm)) {
 303                 capabilities |= CAP_DFS;
 304         }
 305
 306         if (lp_security(global_loadparm) != SEC_SHARE) {
 307                 secword |= NEGOTIATE_SECURITY_USER_LEVEL;
 308         }
 309
 310         if (req->smb_conn->negotiate.encrypted_passwords) {
 311                 secword |= NEGOTIATE_SECURITY_CHALLENGE_RESPONSE;
 312         }
 313
 314         if (req->smb_conn->signing.allow_smb_signing) {
 315                 secword |= NEGOTIATE_SECURITY_SIGNATURES_ENABLED;
 316         }
 317
 318         if (req->smb_conn->signing.mandatory_signing) {
 319                 secword |= NEGOTIATE_SECURITY_SIGNATURES_REQUIRED;
 320         }
 321
 322         req->smb_conn->negotiate.protocol = PROTOCOL_NT1;
 323
 324         smbsrv_setup_reply(req, 17, 0);
 325
 326         SSVAL(req->out.vwv, VWV(0), choice);
 327         SCVAL(req->out.vwv, VWV(1), secword);
 328
 329         /* notice the strange +1 on vwv here? That's because
 330            this is the one and only SMB packet that is malformed in
 331            the specification - all the command words after the secword
 332            are offset by 1 byte */
 333         SSVAL(req->out.vwv+1, VWV(1), lp_maxmux(global_loadparm));
 334         SSVAL(req->out.vwv+1, VWV(2), 1); /* num vcs */
 335         SIVAL(req->out.vwv+1, VWV(3), req->smb_conn->negotiate.max_recv);
 336         SIVAL(req->out.vwv+1, VWV(5), 0x10000); /* raw size. full 64k */
 337         SIVAL(req->out.vwv+1, VWV(7), req->smb_conn->connection->server_id.id); /* session key */
 338         SIVAL(req->out.vwv+1, VWV(9), capabilities);
 339         push_nttime(req->out.vwv+1, VWV(11), nttime);
 340         SSVALS(req->out.vwv+1,VWV(15), req->smb_conn->negotiate.zone_offset/60);
 341
 342         if (!negotiate_spnego) {
 343                 reply_nt1_orig(req);
 344         } else {
 345                 struct cli_credentials *server_credentials;
 346                 struct gensec_security *gensec_security;
 347                 DATA_BLOB null_data_blob = data_blob(NULL, 0);
 348                 DATA_BLOB blob;
 349                 const char *oid;
 350                 NTSTATUS nt_status;
 351
 352                 nt_status = gensec_server_start(req->smb_conn,
 353                                                 req->smb_conn->connection->event.ctx,
 354                                                 req->smb_conn->connection->msg_ctx,
 355                                                 &gensec_security);
 356                 if (!NT_STATUS_IS_OK(nt_status)) {
 357                         DEBUG(0, ("Failed to start GENSEC: %s\n", nt_errstr(nt_status)));
 358                         smbsrv_terminate_connection(req->smb_conn, "Failed to start GENSEC\n");
 359                         return;
 360                 }
 361
 362                 if (req->smb_conn->negotiate.auth_context) {
 363                         smbsrv_terminate_connection(req->smb_conn, "reply_nt1: is this a secondary negprot?  auth_context is non-NULL!\n");
 364                         return;
 365                 }
 366
 367                 server_credentials
 368                         = cli_credentials_init(req);
 369                 if (!server_credentials) {
 370                         smbsrv_terminate_connection(req->smb_conn, "Failed to init server credentials\n");
 371                         return;
 372                 }
 373
 374                 cli_credentials_set_conf(server_credentials, global_loadparm);
 375                 nt_status = cli_credentials_set_machine_account(server_credentials);
 376                 if (!NT_STATUS_IS_OK(nt_status)) {
 377                         DEBUG(10, ("Failed to obtain server credentials, perhaps a standalone server?: %s\n", nt_errstr(nt_status)));
 378                         talloc_free(server_credentials);
 379                         server_credentials = NULL;
 380                 }
 381
 382                 req->smb_conn->negotiate.server_credentials = talloc_steal(req->smb_conn, server_credentials);
 383
 384                 gensec_set_target_service(gensec_security, "cifs");
 385
 386                 gensec_set_credentials(gensec_security, server_credentials);
 387
 388                 oid = GENSEC_OID_SPNEGO;
 389                 nt_status = gensec_start_mech_by_oid(gensec_security, oid);
 390
 391                 if (NT_STATUS_IS_OK(nt_status)) {
 392                         /* Get and push the proposed OID list into the packets */
 393                         nt_status = gensec_update(gensec_security, req, null_data_blob, &blob);
 394
 395                         if (!NT_STATUS_IS_OK(nt_status) && !NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 396                                 DEBUG(1, ("Failed to get SPNEGO to give us the first token: %s\n", nt_errstr(nt_status)));
 397                         }
 398                 }
 399
 400                 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 401                         DEBUG(3,("using SPNEGO\n"));
 402                 } else {
 403                         DEBUG(5, ("Failed to start SPNEGO, falling back to NTLMSSP only: %s\n", nt_errstr(nt_status)));
 404                         oid = GENSEC_OID_NTLMSSP;
 405                         nt_status = gensec_start_mech_by_oid(gensec_security, oid);
 406
 407                         if (!NT_STATUS_IS_OK(nt_status)) {
 408                                 DEBUG(0, ("Failed to start SPNEGO as well as NTLMSSP fallback: %s\n", nt_errstr(nt_status)));
 409                                 reply_nt1_orig(req);
 410                                 return;
 411                         }
 412                         /* NTLMSSP is a client-first exchange */
 413                         blob = data_blob(NULL, 0);
 414                         DEBUG(3,("using raw-NTLMSSP\n"));
 415                 }
 416
 417                 req->smb_conn->negotiate.oid = oid;
 418
 419                 req_grow_data(req, blob.length + 16);
 420                 /* a NOT very random guid, perhaps we should get it
 421                  * from the credentials (kitchen sink...) */
 422                 memset(req->out.ptr, '\0', 16);
 423                 req->out.ptr += 16;
 424
 425                 memcpy(req->out.ptr, blob.data, blob.length);
 426                 SCVAL(req->out.vwv+1, VWV(16), blob.length + 16);
 427                 req->out.ptr += blob.length;
 428         }
 429
 430         smbsrv_send_reply_nosign(req);
 431 }
 432
 433 /****************************************************************************
 434  Reply for the SMB2 2.001 protocol
 435 ****************************************************************************/
 436 static void reply_smb2(struct smbsrv_request *req, uint16_t choice)
 437 {
 438         struct smbsrv_connection *smb_conn = req->smb_conn;
 439         NTSTATUS status;
 440
 441         talloc_free(smb_conn->sessions.idtree_vuid);
 442         ZERO_STRUCT(smb_conn->sessions);
 443         talloc_free(smb_conn->smb_tcons.idtree_tid);
 444         ZERO_STRUCT(smb_conn->smb_tcons);
 445         ZERO_STRUCT(smb_conn->signing);
 446
 447         /* reply with a SMB2 packet */
 448         status = smbsrv_init_smb2_connection(smb_conn);
 449         if (!NT_STATUS_IS_OK(status)) {
 450                 smbsrv_terminate_connection(smb_conn, nt_errstr(status));
 451                 talloc_free(req);
 452                 return;
 453         }
 454         packet_set_callback(smb_conn->packet, smbsrv_recv_smb2_request);
 455         smb2srv_reply_smb_negprot(req);
 456         req = NULL;
 457 }
 458
 459 /* List of supported protocols, most desired first */
 460 static const struct {
 461         const char *proto_name;
 462         const char *short_name;
 463         void (*proto_reply_fn)(struct smbsrv_request *req, uint16_t choice);
 464         int protocol_level;
 465 } supported_protocols[] = {
 466         {"SMB 2.001",                   "SMB2",         reply_smb2,     PROTOCOL_SMB2},
 467         {"NT LANMAN 1.0",               "NT1",          reply_nt1,      PROTOCOL_NT1},
 468         {"NT LM 0.12",                  "NT1",          reply_nt1,      PROTOCOL_NT1},
 469         {"LANMAN2.1",                   "LANMAN2",      reply_lanman2,  PROTOCOL_LANMAN2},
 470         {"LM1.2X002",                   "LANMAN2",      reply_lanman2,  PROTOCOL_LANMAN2},
 471         {"Samba",                       "LANMAN2",      reply_lanman2,  PROTOCOL_LANMAN2},
 472         {"DOS LM1.2X002",               "LANMAN2",      reply_lanman2,  PROTOCOL_LANMAN2},
 473         {"Windows for Workgroups 3.1a", "LANMAN1",      reply_lanman1,  PROTOCOL_LANMAN1},
 474         {"LANMAN1.0",                   "LANMAN1",      reply_lanman1,  PROTOCOL_LANMAN1},
 475         {"MICROSOFT NETWORKS 3.0",      "LANMAN1",      reply_lanman1,  PROTOCOL_LANMAN1},
 476         {"MICROSOFT NETWORKS 1.03",     "COREPLUS",     reply_coreplus, PROTOCOL_COREPLUS},
 477         {"PC NETWORK PROGRAM 1.0",      "CORE",         reply_corep,    PROTOCOL_CORE},
 478         {NULL,NULL,NULL,0},
 479 };
 480
 481 /****************************************************************************
 482  Reply to a negprot.
 483 ****************************************************************************/
 484
 485 void smbsrv_reply_negprot(struct smbsrv_request *req)
 486 {
 487         int protocol;
 488         uint8_t *p;
 489         uint32_t protos_count = 0;
 490         char **protos = NULL;
 491
 492         if (req->smb_conn->negotiate.done_negprot) {
 493                 smbsrv_terminate_connection(req->smb_conn, "multiple negprot's are not permitted");
 494                 return;
 495         }
 496         req->smb_conn->negotiate.done_negprot = true;
 497
 498         p = req->in.data;
 499         while (true) {
 500                 size_t len;
 501
 502                 protos = talloc_realloc(req, protos, char *, protos_count + 1);
 503                 if (!protos) {
 504                         smbsrv_terminate_connection(req->smb_conn, nt_errstr(NT_STATUS_NO_MEMORY));
 505                         return;
 506                 }
 507                 protos[protos_count] = NULL;
 508                 len = req_pull_ascii4(req, (const char **)&protos[protos_count], p, STR_ASCII|STR_TERMINATE);
 509                 p += len;
 510                 if (len == 0 || !protos[protos_count]) break;
 511
 512                 DEBUG(5,("Requested protocol [%d][%s]\n", protos_count, protos[protos_count]));
 513                 protos_count++;
 514         }
 515
 516         /* Check for protocols, most desirable first */
 517         for (protocol = 0; supported_protocols[protocol].proto_name; protocol++) {
 518                 int i;
 519
 520                 if (supported_protocols[protocol].protocol_level > lp_srv_maxprotocol(global_loadparm))
 521                         continue;
 522                 if (supported_protocols[protocol].protocol_level < lp_srv_minprotocol(global_loadparm))
 523                         continue;
 524
 525                 for (i = 0; i < protos_count; i++) {
 526                         if (strcmp(supported_protocols[protocol].proto_name, protos[i]) != 0) continue;
 527
 528                         supported_protocols[protocol].proto_reply_fn(req, i);
 529                         DEBUG(3,("Selected protocol [%d][%s]\n",
 530                                 i, supported_protocols[protocol].proto_name));
 531                         return;
 532                 }
 533         }
 534
 535         smbsrv_terminate_connection(req->smb_conn, "No protocol supported !");
 536 }