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 #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                                         global_loadparm,
  51                                         &smb_conn->negotiate.auth_context);
  52         if (!NT_STATUS_IS_OK(nt_status)) {
  53                 DEBUG(0, ("auth_context_create() returned %s", nt_errstr(nt_status)));
  54                 return nt_status;
  55         }
  56
  57         nt_status = auth_get_challenge(smb_conn->negotiate.auth_context, &challenge);
  58         if (!NT_STATUS_IS_OK(nt_status)) {
  59                 DEBUG(0, ("auth_get_challenge() returned %s", nt_errstr(nt_status)));
  60                 return nt_status;
  61         }
  62
  63         memcpy(buff, challenge, 8);
  64
  65         return NT_STATUS_OK;
  66 }
  67
  68 /****************************************************************************
  69  Reply for the core protocol.
  70 ****************************************************************************/
  71 static void reply_corep(struct smbsrv_request *req, uint16_t choice)
  72 {
  73         smbsrv_setup_reply(req, 1, 0);
  74
  75         SSVAL(req->out.vwv, VWV(0), choice);
  76
  77         req->smb_conn->negotiate.protocol = PROTOCOL_CORE;
  78
  79         if (req->smb_conn->signing.mandatory_signing) {
  80                 smbsrv_terminate_connection(req->smb_conn,
  81                                             "CORE does not support SMB signing, and it is mandatory\n");
  82                 return;
  83         }
  84
  85         smbsrv_send_reply(req);
  86 }
  87
  88 /****************************************************************************
  89  Reply for the coreplus protocol.
  90 this is quite incomplete - we only fill in a small part of the reply, but as nobody uses
  91 this any more it probably doesn't matter
  92 ****************************************************************************/
  93 static void reply_coreplus(struct smbsrv_request *req, uint16_t choice)
  94 {
  95         uint16_t raw = (lp_readraw(global_loadparm)?1:0) | (lp_writeraw(global_loadparm)?2:0);
  96
  97         smbsrv_setup_reply(req, 13, 0);
  98
  99         /* Reply, SMBlockread, SMBwritelock supported. */
 100         SCVAL(req->out.hdr,HDR_FLG,
 101               CVAL(req->out.hdr, HDR_FLG) | FLAG_SUPPORT_LOCKREAD);
 102
 103         SSVAL(req->out.vwv, VWV(0), choice);
 104         SSVAL(req->out.vwv, VWV(1), 0x1); /* user level security, don't encrypt */
 105
 106         /* tell redirector we support
 107            readbraw and writebraw (possibly) */
 108         SSVAL(req->out.vwv, VWV(5), raw);
 109
 110         req->smb_conn->negotiate.protocol = PROTOCOL_COREPLUS;
 111
 112         if (req->smb_conn->signing.mandatory_signing) {
 113                 smbsrv_terminate_connection(req->smb_conn,
 114                                             "COREPLUS does not support SMB signing, and it is mandatory\n");
 115                 return;
 116         }
 117
 118         smbsrv_send_reply(req);
 119 }
 120
 121 /****************************************************************************
 122  Reply for the lanman 1.0 protocol.
 123 ****************************************************************************/
 124 static void reply_lanman1(struct smbsrv_request *req, uint16_t choice)
 125 {
 126         int raw = (lp_readraw(global_loadparm)?1:0) | (lp_writeraw(global_loadparm)?2:0);
 127         int secword=0;
 128         time_t t = req->request_time.tv_sec;
 129
 130         req->smb_conn->negotiate.encrypted_passwords = lp_encrypted_passwords(global_loadparm);
 131
 132         if (lp_security(global_loadparm) != SEC_SHARE)
 133                 secword |= NEGOTIATE_SECURITY_USER_LEVEL;
 134
 135         if (req->smb_conn->negotiate.encrypted_passwords)
 136                 secword |= NEGOTIATE_SECURITY_CHALLENGE_RESPONSE;
 137
 138         req->smb_conn->negotiate.protocol = PROTOCOL_LANMAN1;
 139
 140         smbsrv_setup_reply(req, 13, req->smb_conn->negotiate.encrypted_passwords ? 8 : 0);
 141
 142         /* SMBlockread, SMBwritelock supported. */
 143         SCVAL(req->out.hdr,HDR_FLG,
 144               CVAL(req->out.hdr, HDR_FLG) | FLAG_SUPPORT_LOCKREAD);
 145
 146         SSVAL(req->out.vwv, VWV(0), choice);
 147         SSVAL(req->out.vwv, VWV(1), secword);
 148         SSVAL(req->out.vwv, VWV(2), req->smb_conn->negotiate.max_recv);
 149         SSVAL(req->out.vwv, VWV(3), lp_maxmux(global_loadparm));
 150         SSVAL(req->out.vwv, VWV(4), 1);
 151         SSVAL(req->out.vwv, VWV(5), raw);
 152         SIVAL(req->out.vwv, VWV(6), req->smb_conn->connection->server_id.id);
 153         srv_push_dos_date(req->smb_conn, req->out.vwv, VWV(8), t);
 154         SSVAL(req->out.vwv, VWV(10), req->smb_conn->negotiate.zone_offset/60);
 155         SIVAL(req->out.vwv, VWV(11), 0); /* reserved */
 156
 157         /* Create a token value and add it to the outgoing packet. */
 158         if (req->smb_conn->negotiate.encrypted_passwords) {
 159                 NTSTATUS nt_status;
 160
 161                 SSVAL(req->out.vwv, VWV(11), 8);
 162
 163                 nt_status = get_challenge(req->smb_conn, req->out.data);
 164                 if (!NT_STATUS_IS_OK(nt_status)) {
 165                         smbsrv_terminate_connection(req->smb_conn, "LANMAN1 get_challenge failed\n");
 166                         return;
 167                 }
 168         }
 169
 170         if (req->smb_conn->signing.mandatory_signing) {
 171                 smbsrv_terminate_connection(req->smb_conn,
 172                                             "LANMAN1 does not support SMB signing, and it is mandatory\n");
 173                 return;
 174         }
 175
 176         smbsrv_send_reply(req);
 177 }
 178
 179 /****************************************************************************
 180  Reply for the lanman 2.0 protocol.
 181 ****************************************************************************/
 182 static void reply_lanman2(struct smbsrv_request *req, uint16_t choice)
 183 {
 184         int raw = (lp_readraw(global_loadparm)?1:0) | (lp_writeraw(global_loadparm)?2:0);
 185         int secword=0;
 186         time_t t = req->request_time.tv_sec;
 187
 188         req->smb_conn->negotiate.encrypted_passwords = lp_encrypted_passwords(global_loadparm);
 189
 190         if (lp_security(global_loadparm) != SEC_SHARE)
 191                 secword |= NEGOTIATE_SECURITY_USER_LEVEL;
 192
 193         if (req->smb_conn->negotiate.encrypted_passwords)
 194                 secword |= NEGOTIATE_SECURITY_CHALLENGE_RESPONSE;
 195
 196         req->smb_conn->negotiate.protocol = PROTOCOL_LANMAN2;
 197
 198         smbsrv_setup_reply(req, 13, 0);
 199
 200         SSVAL(req->out.vwv, VWV(0), choice);
 201         SSVAL(req->out.vwv, VWV(1), secword);
 202         SSVAL(req->out.vwv, VWV(2), req->smb_conn->negotiate.max_recv);
 203         SSVAL(req->out.vwv, VWV(3), lp_maxmux(global_loadparm));
 204         SSVAL(req->out.vwv, VWV(4), 1);
 205         SSVAL(req->out.vwv, VWV(5), raw);
 206         SIVAL(req->out.vwv, VWV(6), req->smb_conn->connection->server_id.id);
 207         srv_push_dos_date(req->smb_conn, req->out.vwv, VWV(8), t);
 208         SSVAL(req->out.vwv, VWV(10), req->smb_conn->negotiate.zone_offset/60);
 209         SIVAL(req->out.vwv, VWV(11), 0);
 210
 211         /* Create a token value and add it to the outgoing packet. */
 212         if (req->smb_conn->negotiate.encrypted_passwords) {
 213                 SSVAL(req->out.vwv, VWV(11), 8);
 214                 req_grow_data(req, 8);
 215                 get_challenge(req->smb_conn, req->out.data);
 216         }
 217
 218         req_push_str(req, NULL, lp_workgroup(global_loadparm), -1, STR_TERMINATE);
 219
 220         if (req->smb_conn->signing.mandatory_signing) {
 221                 smbsrv_terminate_connection(req->smb_conn,
 222                                             "LANMAN2 does not support SMB signing, and it is mandatory\n");
 223                 return;
 224         }
 225
 226         smbsrv_send_reply(req);
 227 }
 228
 229 static void reply_nt1_orig(struct smbsrv_request *req)
 230 {
 231         /* Create a token value and add it to the outgoing packet. */
 232         if (req->smb_conn->negotiate.encrypted_passwords) {
 233                 req_grow_data(req, 8);
 234                 /* note that we do not send a challenge at all if
 235                    we are using plaintext */
 236                 get_challenge(req->smb_conn, req->out.ptr);
 237                 req->out.ptr += 8;
 238                 SCVAL(req->out.vwv+1, VWV(16), 8);
 239         }
 240         req_push_str(req, NULL, lp_workgroup(global_loadparm), -1, STR_UNICODE|STR_TERMINATE|STR_NOALIGN);
 241         req_push_str(req, NULL, lp_netbios_name(global_loadparm), -1, STR_UNICODE|STR_TERMINATE|STR_NOALIGN);
 242         DEBUG(3,("not using extended security (SPNEGO or NTLMSSP)\n"));
 243 }
 244
 245 /****************************************************************************
 246  Reply for the nt protocol.
 247 ****************************************************************************/
 248 static void reply_nt1(struct smbsrv_request *req, uint16_t choice)
 249 {
 250         /* dual names + lock_and_read + nt SMBs + remote API calls */
 251         int capabilities;
 252         int secword=0;
 253         time_t t = req->request_time.tv_sec;
 254         NTTIME nttime;
 255         bool negotiate_spnego = false;
 256         char *large_test_path;
 257
 258         unix_to_nt_time(&nttime, t);
 259
 260         capabilities =
 261                 CAP_NT_FIND | CAP_LOCK_AND_READ |
 262                 CAP_LEVEL_II_OPLOCKS | CAP_NT_SMBS | CAP_RPC_REMOTE_APIS;
 263
 264         req->smb_conn->negotiate.encrypted_passwords = lp_encrypted_passwords(global_loadparm);
 265
 266         /* do spnego in user level security if the client
 267            supports it and we can do encrypted passwords */
 268
 269         if (req->smb_conn->negotiate.encrypted_passwords &&
 270             (lp_security(global_loadparm) != SEC_SHARE) &&
 271             lp_use_spnego(global_loadparm) &&
 272             (req->flags2 & FLAGS2_EXTENDED_SECURITY)) {
 273                 negotiate_spnego = true;
 274                 capabilities |= CAP_EXTENDED_SECURITY;
 275         }
 276
 277         if (lp_unix_extensions(global_loadparm)) {
 278                 capabilities |= CAP_UNIX;
 279         }
 280
 281         if (lp_large_readwrite(global_loadparm)) {
 282                 capabilities |= CAP_LARGE_READX | CAP_LARGE_WRITEX | CAP_W2K_SMBS;
 283         }
 284
 285         large_test_path = lock_path(req, global_loadparm, "large_test.dat");
 286         if (large_file_support(large_test_path)) {
 287                 capabilities |= CAP_LARGE_FILES;
 288         }
 289
 290         if (lp_readraw(global_loadparm) && lp_writeraw(global_loadparm)) {
 291                 capabilities |= CAP_RAW_MODE;
 292         }
 293
 294         /* allow for disabling unicode */
 295         if (lp_unicode(global_loadparm)) {
 296                 capabilities |= CAP_UNICODE;
 297         }
 298
 299         if (lp_nt_status_support(global_loadparm)) {
 300                 capabilities |= CAP_STATUS32;
 301         }
 302
 303         if (lp_host_msdfs(global_loadparm)) {
 304                 capabilities |= CAP_DFS;
 305         }
 306
 307         if (lp_security(global_loadparm) != SEC_SHARE) {
 308                 secword |= NEGOTIATE_SECURITY_USER_LEVEL;
 309         }
 310
 311         if (req->smb_conn->negotiate.encrypted_passwords) {
 312                 secword |= NEGOTIATE_SECURITY_CHALLENGE_RESPONSE;
 313         }
 314
 315         if (req->smb_conn->signing.allow_smb_signing) {
 316                 secword |= NEGOTIATE_SECURITY_SIGNATURES_ENABLED;
 317         }
 318
 319         if (req->smb_conn->signing.mandatory_signing) {
 320                 secword |= NEGOTIATE_SECURITY_SIGNATURES_REQUIRED;
 321         }
 322
 323         req->smb_conn->negotiate.protocol = PROTOCOL_NT1;
 324
 325         smbsrv_setup_reply(req, 17, 0);
 326
 327         SSVAL(req->out.vwv, VWV(0), choice);
 328         SCVAL(req->out.vwv, VWV(1), secword);
 329
 330         /* notice the strange +1 on vwv here? That's because
 331            this is the one and only SMB packet that is malformed in
 332            the specification - all the command words after the secword
 333            are offset by 1 byte */
 334         SSVAL(req->out.vwv+1, VWV(1), lp_maxmux(global_loadparm));
 335         SSVAL(req->out.vwv+1, VWV(2), 1); /* num vcs */
 336         SIVAL(req->out.vwv+1, VWV(3), req->smb_conn->negotiate.max_recv);
 337         SIVAL(req->out.vwv+1, VWV(5), 0x10000); /* raw size. full 64k */
 338         SIVAL(req->out.vwv+1, VWV(7), req->smb_conn->connection->server_id.id); /* session key */
 339         SIVAL(req->out.vwv+1, VWV(9), capabilities);
 340         push_nttime(req->out.vwv+1, VWV(11), nttime);
 341         SSVALS(req->out.vwv+1,VWV(15), req->smb_conn->negotiate.zone_offset/60);
 342
 343         if (!negotiate_spnego) {
 344                 reply_nt1_orig(req);
 345         } else {
 346                 struct cli_credentials *server_credentials;
 347                 struct gensec_security *gensec_security;
 348                 DATA_BLOB null_data_blob = data_blob(NULL, 0);
 349                 DATA_BLOB blob;
 350                 const char *oid;
 351                 NTSTATUS nt_status;
 352
 353                 nt_status = gensec_server_start(req->smb_conn,
 354                                                 req->smb_conn->connection->event.ctx,
 355                                                 global_loadparm,
 356                                                 req->smb_conn->connection->msg_ctx,
 357                                                 &gensec_security);
 358                 if (!NT_STATUS_IS_OK(nt_status)) {
 359                         DEBUG(0, ("Failed to start GENSEC: %s\n", nt_errstr(nt_status)));
 360                         smbsrv_terminate_connection(req->smb_conn, "Failed to start GENSEC\n");
 361                         return;
 362                 }
 363
 364                 if (req->smb_conn->negotiate.auth_context) {
 365                         smbsrv_terminate_connection(req->smb_conn, "reply_nt1: is this a secondary negprot?  auth_context is non-NULL!\n");
 366                         return;
 367                 }
 368
 369                 server_credentials
 370                         = cli_credentials_init(req);
 371                 if (!server_credentials) {
 372                         smbsrv_terminate_connection(req->smb_conn, "Failed to init server credentials\n");
 373                         return;
 374                 }
 375
 376                 cli_credentials_set_conf(server_credentials, global_loadparm);
 377                 nt_status = cli_credentials_set_machine_account(server_credentials);
 378                 if (!NT_STATUS_IS_OK(nt_status)) {
 379                         DEBUG(10, ("Failed to obtain server credentials, perhaps a standalone server?: %s\n", nt_errstr(nt_status)));
 380                         talloc_free(server_credentials);
 381                         server_credentials = NULL;
 382                 }
 383
 384                 req->smb_conn->negotiate.server_credentials = talloc_steal(req->smb_conn, server_credentials);
 385
 386                 gensec_set_target_service(gensec_security, "cifs");
 387
 388                 gensec_set_credentials(gensec_security, server_credentials);
 389
 390                 oid = GENSEC_OID_SPNEGO;
 391                 nt_status = gensec_start_mech_by_oid(gensec_security, oid);
 392
 393                 if (NT_STATUS_IS_OK(nt_status)) {
 394                         /* Get and push the proposed OID list into the packets */
 395                         nt_status = gensec_update(gensec_security, req, null_data_blob, &blob);
 396
 397                         if (!NT_STATUS_IS_OK(nt_status) && !NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 398                                 DEBUG(1, ("Failed to get SPNEGO to give us the first token: %s\n", nt_errstr(nt_status)));
 399                         }
 400                 }
 401
 402                 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 403                         DEBUG(3,("using SPNEGO\n"));
 404                 } else {
 405                         DEBUG(5, ("Failed to start SPNEGO, falling back to NTLMSSP only: %s\n", nt_errstr(nt_status)));
 406                         oid = GENSEC_OID_NTLMSSP;
 407                         nt_status = gensec_start_mech_by_oid(gensec_security, oid);
 408
 409                         if (!NT_STATUS_IS_OK(nt_status)) {
 410                                 DEBUG(0, ("Failed to start SPNEGO as well as NTLMSSP fallback: %s\n", nt_errstr(nt_status)));
 411                                 reply_nt1_orig(req);
 412                                 return;
 413                         }
 414                         /* NTLMSSP is a client-first exchange */
 415                         blob = data_blob(NULL, 0);
 416                         DEBUG(3,("using raw-NTLMSSP\n"));
 417                 }
 418
 419                 req->smb_conn->negotiate.oid = oid;
 420
 421                 req_grow_data(req, blob.length + 16);
 422                 /* a NOT very random guid, perhaps we should get it
 423                  * from the credentials (kitchen sink...) */
 424                 memset(req->out.ptr, '\0', 16);
 425                 req->out.ptr += 16;
 426
 427                 memcpy(req->out.ptr, blob.data, blob.length);
 428                 SCVAL(req->out.vwv+1, VWV(16), blob.length + 16);
 429                 req->out.ptr += blob.length;
 430         }
 431
 432         smbsrv_send_reply_nosign(req);
 433 }
 434
 435 /****************************************************************************
 436  Reply for the SMB2 2.001 protocol
 437 ****************************************************************************/
 438 static void reply_smb2(struct smbsrv_request *req, uint16_t choice)
 439 {
 440         struct smbsrv_connection *smb_conn = req->smb_conn;
 441         NTSTATUS status;
 442
 443         talloc_free(smb_conn->sessions.idtree_vuid);
 444         ZERO_STRUCT(smb_conn->sessions);
 445         talloc_free(smb_conn->smb_tcons.idtree_tid);
 446         ZERO_STRUCT(smb_conn->smb_tcons);
 447         ZERO_STRUCT(smb_conn->signing);
 448
 449         /* reply with a SMB2 packet */
 450         status = smbsrv_init_smb2_connection(smb_conn);
 451         if (!NT_STATUS_IS_OK(status)) {
 452                 smbsrv_terminate_connection(smb_conn, nt_errstr(status));
 453                 talloc_free(req);
 454                 return;
 455         }
 456         packet_set_callback(smb_conn->packet, smbsrv_recv_smb2_request);
 457         smb2srv_reply_smb_negprot(req);
 458         req = NULL;
 459 }
 460
 461 /* List of supported protocols, most desired first */
 462 static const struct {
 463         const char *proto_name;
 464         const char *short_name;
 465         void (*proto_reply_fn)(struct smbsrv_request *req, uint16_t choice);
 466         int protocol_level;
 467 } supported_protocols[] = {
 468         {"SMB 2.001",                   "SMB2",         reply_smb2,     PROTOCOL_SMB2},
 469         {"NT LANMAN 1.0",               "NT1",          reply_nt1,      PROTOCOL_NT1},
 470         {"NT LM 0.12",                  "NT1",          reply_nt1,      PROTOCOL_NT1},
 471         {"LANMAN2.1",                   "LANMAN2",      reply_lanman2,  PROTOCOL_LANMAN2},
 472         {"LM1.2X002",                   "LANMAN2",      reply_lanman2,  PROTOCOL_LANMAN2},
 473         {"Samba",                       "LANMAN2",      reply_lanman2,  PROTOCOL_LANMAN2},
 474         {"DOS LM1.2X002",               "LANMAN2",      reply_lanman2,  PROTOCOL_LANMAN2},
 475         {"Windows for Workgroups 3.1a", "LANMAN1",      reply_lanman1,  PROTOCOL_LANMAN1},
 476         {"LANMAN1.0",                   "LANMAN1",      reply_lanman1,  PROTOCOL_LANMAN1},
 477         {"MICROSOFT NETWORKS 3.0",      "LANMAN1",      reply_lanman1,  PROTOCOL_LANMAN1},
 478         {"MICROSOFT NETWORKS 1.03",     "COREPLUS",     reply_coreplus, PROTOCOL_COREPLUS},
 479         {"PC NETWORK PROGRAM 1.0",      "CORE",         reply_corep,    PROTOCOL_CORE},
 480         {NULL,NULL,NULL,0},
 481 };
 482
 483 /****************************************************************************
 484  Reply to a negprot.
 485 ****************************************************************************/
 486
 487 void smbsrv_reply_negprot(struct smbsrv_request *req)
 488 {
 489         int protocol;
 490         uint8_t *p;
 491         uint32_t protos_count = 0;
 492         char **protos = NULL;
 493
 494         if (req->smb_conn->negotiate.done_negprot) {
 495                 smbsrv_terminate_connection(req->smb_conn, "multiple negprot's are not permitted");
 496                 return;
 497         }
 498         req->smb_conn->negotiate.done_negprot = true;
 499
 500         p = req->in.data;
 501         while (true) {
 502                 size_t len;
 503
 504                 protos = talloc_realloc(req, protos, char *, protos_count + 1);
 505                 if (!protos) {
 506                         smbsrv_terminate_connection(req->smb_conn, nt_errstr(NT_STATUS_NO_MEMORY));
 507                         return;
 508                 }
 509                 protos[protos_count] = NULL;
 510                 len = req_pull_ascii4(req, (const char **)&protos[protos_count], p, STR_ASCII|STR_TERMINATE);
 511                 p += len;
 512                 if (len == 0 || !protos[protos_count]) break;
 513
 514                 DEBUG(5,("Requested protocol [%d][%s]\n", protos_count, protos[protos_count]));
 515                 protos_count++;
 516         }
 517
 518         /* Check for protocols, most desirable first */
 519         for (protocol = 0; supported_protocols[protocol].proto_name; protocol++) {
 520                 int i;
 521
 522                 if (supported_protocols[protocol].protocol_level > lp_srv_maxprotocol(global_loadparm))
 523                         continue;
 524                 if (supported_protocols[protocol].protocol_level < lp_srv_minprotocol(global_loadparm))
 525                         continue;
 526
 527                 for (i = 0; i < protos_count; i++) {
 528                         if (strcmp(supported_protocols[protocol].proto_name, protos[i]) != 0) continue;
 529
 530                         supported_protocols[protocol].proto_reply_fn(req, i);
 531                         DEBUG(3,("Selected protocol [%d][%s]\n",
 532                                 i, supported_protocols[protocol].proto_name));
 533                         return;
 534                 }
 535         }
 536
 537         smbsrv_terminate_connection(req->smb_conn, "No protocol supported !");
 538 }