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 "smbd/service_stream.h"
  28 #include "lib/stream/packet.h"
  29 #include "param/param.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
  37         /* muliple negprots are not premitted */
  38         if (smb_conn->negotiate.auth_context) {
  39                 DEBUG(3,("get challenge: is this a secondary negprot?  auth_context is non-NULL!\n"));
  40                 return NT_STATUS_FOOBAR;
  41         }
  42
  43         DEBUG(10, ("get challenge: creating negprot_global_auth_context\n"));
  44
  45         nt_status = auth_context_create(smb_conn,
  46                                         smb_conn->connection->event.ctx,
  47                                         smb_conn->connection->msg_ctx,
  48                                         smb_conn->lp_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, buff);
  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         return NT_STATUS_OK;
  62 }
  63
  64 /****************************************************************************
  65  Reply for the core protocol.
  66 ****************************************************************************/
  67 static void reply_corep(struct smbsrv_request *req, uint16_t choice)
  68 {
  69         smbsrv_setup_reply(req, 1, 0);
  70
  71         SSVAL(req->out.vwv, VWV(0), choice);
  72
  73         req->smb_conn->negotiate.protocol = PROTOCOL_CORE;
  74
  75         if (req->smb_conn->signing.mandatory_signing) {
  76                 smbsrv_terminate_connection(req->smb_conn,
  77                                             "CORE does not support SMB signing, and it is mandatory\n");
  78                 return;
  79         }
  80
  81         smbsrv_send_reply(req);
  82 }
  83
  84 /****************************************************************************
  85  Reply for the coreplus protocol.
  86 this is quite incomplete - we only fill in a small part of the reply, but as nobody uses
  87 this any more it probably doesn't matter
  88 ****************************************************************************/
  89 static void reply_coreplus(struct smbsrv_request *req, uint16_t choice)
  90 {
  91         uint16_t raw = (lpcfg_readraw(req->smb_conn->lp_ctx)?1:0) | (lpcfg_writeraw(req->smb_conn->lp_ctx)?2:0);
  92
  93         smbsrv_setup_reply(req, 13, 0);
  94
  95         /* Reply, SMBlockread, SMBwritelock supported. */
  96         SCVAL(req->out.hdr,HDR_FLG,
  97               CVAL(req->out.hdr, HDR_FLG) | FLAG_SUPPORT_LOCKREAD);
  98
  99         SSVAL(req->out.vwv, VWV(0), choice);
 100         SSVAL(req->out.vwv, VWV(1), 0x1); /* user level security, don't encrypt */
 101
 102         /* tell redirector we support
 103            readbraw and writebraw (possibly) */
 104         SSVAL(req->out.vwv, VWV(5), raw);
 105
 106         req->smb_conn->negotiate.protocol = PROTOCOL_COREPLUS;
 107
 108         if (req->smb_conn->signing.mandatory_signing) {
 109                 smbsrv_terminate_connection(req->smb_conn,
 110                                             "COREPLUS does not support SMB signing, and it is mandatory\n");
 111                 return;
 112         }
 113
 114         smbsrv_send_reply(req);
 115 }
 116
 117 /****************************************************************************
 118  Reply for the lanman 1.0 protocol.
 119 ****************************************************************************/
 120 static void reply_lanman1(struct smbsrv_request *req, uint16_t choice)
 121 {
 122         int raw = (lpcfg_readraw(req->smb_conn->lp_ctx)?1:0) | (lpcfg_writeraw(req->smb_conn->lp_ctx)?2:0);
 123         int secword=0;
 124         time_t t = req->request_time.tv_sec;
 125
 126         req->smb_conn->negotiate.encrypted_passwords = lpcfg_encrypted_passwords(req->smb_conn->lp_ctx);
 127
 128         if (req->smb_conn->negotiate.encrypted_passwords)
 129                 secword |= NEGOTIATE_SECURITY_CHALLENGE_RESPONSE;
 130
 131         req->smb_conn->negotiate.protocol = PROTOCOL_LANMAN1;
 132
 133         smbsrv_setup_reply(req, 13, req->smb_conn->negotiate.encrypted_passwords ? 8 : 0);
 134
 135         /* SMBlockread, SMBwritelock supported. */
 136         SCVAL(req->out.hdr,HDR_FLG,
 137               CVAL(req->out.hdr, HDR_FLG) | FLAG_SUPPORT_LOCKREAD);
 138
 139         SSVAL(req->out.vwv, VWV(0), choice);
 140         SSVAL(req->out.vwv, VWV(1), secword);
 141         SSVAL(req->out.vwv, VWV(2), req->smb_conn->negotiate.max_recv);
 142         SSVAL(req->out.vwv, VWV(3), lpcfg_maxmux(req->smb_conn->lp_ctx));
 143         SSVAL(req->out.vwv, VWV(4), 1);
 144         SSVAL(req->out.vwv, VWV(5), raw);
 145         SIVAL(req->out.vwv, VWV(6), req->smb_conn->connection->server_id.pid);
 146         srv_push_dos_date(req->smb_conn, req->out.vwv, VWV(8), t);
 147         SSVAL(req->out.vwv, VWV(10), req->smb_conn->negotiate.zone_offset/60);
 148         SIVAL(req->out.vwv, VWV(11), 0); /* reserved */
 149
 150         /* Create a token value and add it to the outgoing packet. */
 151         if (req->smb_conn->negotiate.encrypted_passwords) {
 152                 NTSTATUS nt_status;
 153
 154                 SSVAL(req->out.vwv, VWV(11), 8);
 155
 156                 nt_status = get_challenge(req->smb_conn, req->out.data);
 157                 if (!NT_STATUS_IS_OK(nt_status)) {
 158                         smbsrv_terminate_connection(req->smb_conn, "LANMAN1 get_challenge failed\n");
 159                         return;
 160                 }
 161         }
 162
 163         if (req->smb_conn->signing.mandatory_signing) {
 164                 smbsrv_terminate_connection(req->smb_conn,
 165                                             "LANMAN1 does not support SMB signing, and it is mandatory\n");
 166                 return;
 167         }
 168
 169         smbsrv_send_reply(req);
 170 }
 171
 172 /****************************************************************************
 173  Reply for the lanman 2.0 protocol.
 174 ****************************************************************************/
 175 static void reply_lanman2(struct smbsrv_request *req, uint16_t choice)
 176 {
 177         int raw = (lpcfg_readraw(req->smb_conn->lp_ctx)?1:0) | (lpcfg_writeraw(req->smb_conn->lp_ctx)?2:0);
 178         int secword=0;
 179         time_t t = req->request_time.tv_sec;
 180
 181         req->smb_conn->negotiate.encrypted_passwords = lpcfg_encrypted_passwords(req->smb_conn->lp_ctx);
 182
 183         if (req->smb_conn->negotiate.encrypted_passwords)
 184                 secword |= NEGOTIATE_SECURITY_CHALLENGE_RESPONSE;
 185
 186         req->smb_conn->negotiate.protocol = PROTOCOL_LANMAN2;
 187
 188         smbsrv_setup_reply(req, 13, 0);
 189
 190         SSVAL(req->out.vwv, VWV(0), choice);
 191         SSVAL(req->out.vwv, VWV(1), secword);
 192         SSVAL(req->out.vwv, VWV(2), req->smb_conn->negotiate.max_recv);
 193         SSVAL(req->out.vwv, VWV(3), lpcfg_maxmux(req->smb_conn->lp_ctx));
 194         SSVAL(req->out.vwv, VWV(4), 1);
 195         SSVAL(req->out.vwv, VWV(5), raw);
 196         SIVAL(req->out.vwv, VWV(6), req->smb_conn->connection->server_id.pid);
 197         srv_push_dos_date(req->smb_conn, req->out.vwv, VWV(8), t);
 198         SSVAL(req->out.vwv, VWV(10), req->smb_conn->negotiate.zone_offset/60);
 199         SIVAL(req->out.vwv, VWV(11), 0);
 200
 201         /* Create a token value and add it to the outgoing packet. */
 202         if (req->smb_conn->negotiate.encrypted_passwords) {
 203                 SSVAL(req->out.vwv, VWV(11), 8);
 204                 req_grow_data(req, 8);
 205                 get_challenge(req->smb_conn, req->out.data);
 206         }
 207
 208         req_push_str(req, NULL, lpcfg_workgroup(req->smb_conn->lp_ctx), -1, STR_TERMINATE);
 209
 210         if (req->smb_conn->signing.mandatory_signing) {
 211                 smbsrv_terminate_connection(req->smb_conn,
 212                                             "LANMAN2 does not support SMB signing, and it is mandatory\n");
 213                 return;
 214         }
 215
 216         smbsrv_send_reply(req);
 217 }
 218
 219 static void reply_nt1_orig(struct smbsrv_request *req)
 220 {
 221         /* Create a token value and add it to the outgoing packet. */
 222         if (req->smb_conn->negotiate.encrypted_passwords) {
 223                 req_grow_data(req, 8);
 224                 /* note that we do not send a challenge at all if
 225                    we are using plaintext */
 226                 get_challenge(req->smb_conn, req->out.ptr);
 227                 req->out.ptr += 8;
 228                 SCVAL(req->out.vwv+1, VWV(16), 8);
 229         }
 230         req_push_str(req, NULL, lpcfg_workgroup(req->smb_conn->lp_ctx), -1, STR_UNICODE|STR_TERMINATE|STR_NOALIGN);
 231         req_push_str(req, NULL, lpcfg_netbios_name(req->smb_conn->lp_ctx), -1, STR_UNICODE|STR_TERMINATE|STR_NOALIGN);
 232         DEBUG(3,("not using extended security (SPNEGO or NTLMSSP)\n"));
 233 }
 234
 235 /****************************************************************************
 236  Reply for the nt protocol.
 237 ****************************************************************************/
 238 static void reply_nt1(struct smbsrv_request *req, uint16_t choice)
 239 {
 240         /* dual names + lock_and_read + nt SMBs + remote API calls */
 241         int capabilities;
 242         int secword=0;
 243         time_t t = req->request_time.tv_sec;
 244         NTTIME nttime;
 245         bool negotiate_spnego = false;
 246         char *large_test_path;
 247
 248         unix_to_nt_time(&nttime, t);
 249
 250         capabilities =
 251                 CAP_NT_FIND | CAP_LOCK_AND_READ |
 252                 CAP_LEVEL_II_OPLOCKS | CAP_NT_SMBS | CAP_RPC_REMOTE_APIS;
 253
 254         req->smb_conn->negotiate.encrypted_passwords = lpcfg_encrypted_passwords(req->smb_conn->lp_ctx);
 255
 256         /* do spnego in user level security if the client
 257            supports it and we can do encrypted passwords */
 258
 259         if (req->smb_conn->negotiate.encrypted_passwords &&
 260             lpcfg_use_spnego(req->smb_conn->lp_ctx) &&
 261             (req->flags2 & FLAGS2_EXTENDED_SECURITY)) {
 262                 negotiate_spnego = true;
 263                 capabilities |= CAP_EXTENDED_SECURITY;
 264         }
 265
 266         if (lpcfg_unix_extensions(req->smb_conn->lp_ctx)) {
 267                 capabilities |= CAP_UNIX;
 268         }
 269
 270         if (lpcfg_large_readwrite(req->smb_conn->lp_ctx)) {
 271                 capabilities |= CAP_LARGE_READX | CAP_LARGE_WRITEX | CAP_W2K_SMBS;
 272         }
 273
 274         large_test_path = lpcfg_lock_path(req, req->smb_conn->lp_ctx, "large_test.dat");
 275         if (large_file_support(large_test_path)) {
 276                 capabilities |= CAP_LARGE_FILES;
 277         }
 278
 279         if (lpcfg_readraw(req->smb_conn->lp_ctx) &&
 280             lpcfg_writeraw(req->smb_conn->lp_ctx)) {
 281                 capabilities |= CAP_RAW_MODE;
 282         }
 283
 284         /* allow for disabling unicode */
 285         if (lpcfg_unicode(req->smb_conn->lp_ctx)) {
 286                 capabilities |= CAP_UNICODE;
 287         }
 288
 289         if (lpcfg_nt_status_support(req->smb_conn->lp_ctx)) {
 290                 capabilities |= CAP_STATUS32;
 291         }
 292
 293         if (lpcfg_host_msdfs(req->smb_conn->lp_ctx)) {
 294                 capabilities |= CAP_DFS;
 295         }
 296
 297         secword |= NEGOTIATE_SECURITY_USER_LEVEL;
 298
 299         if (req->smb_conn->negotiate.encrypted_passwords) {
 300                 secword |= NEGOTIATE_SECURITY_CHALLENGE_RESPONSE;
 301         }
 302
 303         if (req->smb_conn->signing.allow_smb_signing) {
 304                 secword |= NEGOTIATE_SECURITY_SIGNATURES_ENABLED;
 305         }
 306
 307         if (req->smb_conn->signing.mandatory_signing) {
 308                 secword |= NEGOTIATE_SECURITY_SIGNATURES_REQUIRED;
 309         }
 310
 311         req->smb_conn->negotiate.protocol = PROTOCOL_NT1;
 312
 313         smbsrv_setup_reply(req, 17, 0);
 314
 315         SSVAL(req->out.vwv, VWV(0), choice);
 316         SCVAL(req->out.vwv, VWV(1), secword);
 317
 318         /* notice the strange +1 on vwv here? That's because
 319            this is the one and only SMB packet that is malformed in
 320            the specification - all the command words after the secword
 321            are offset by 1 byte */
 322         SSVAL(req->out.vwv+1, VWV(1), lpcfg_maxmux(req->smb_conn->lp_ctx));
 323         SSVAL(req->out.vwv+1, VWV(2), 1); /* num vcs */
 324         SIVAL(req->out.vwv+1, VWV(3), req->smb_conn->negotiate.max_recv);
 325         SIVAL(req->out.vwv+1, VWV(5), 0x10000); /* raw size. full 64k */
 326         SIVAL(req->out.vwv+1, VWV(7), req->smb_conn->connection->server_id.pid); /* session key */
 327
 328         SIVAL(req->out.vwv+1, VWV(9), capabilities);
 329         push_nttime(req->out.vwv+1, VWV(11), nttime);
 330         SSVALS(req->out.vwv+1,VWV(15), req->smb_conn->negotiate.zone_offset/60);
 331
 332         if (!negotiate_spnego) {
 333                 reply_nt1_orig(req);
 334         } else {
 335                 struct cli_credentials *server_credentials;
 336                 struct gensec_security *gensec_security;
 337                 DATA_BLOB null_data_blob = data_blob(NULL, 0);
 338                 DATA_BLOB blob;
 339                 const char *oid;
 340                 NTSTATUS nt_status;
 341
 342                 server_credentials
 343                         = cli_credentials_init(req);
 344                 if (!server_credentials) {
 345                         smbsrv_terminate_connection(req->smb_conn, "Failed to init server credentials\n");
 346                         return;
 347                 }
 348
 349                 cli_credentials_set_conf(server_credentials, req->smb_conn->lp_ctx);
 350                 nt_status = cli_credentials_set_machine_account(server_credentials, req->smb_conn->lp_ctx);
 351                 if (!NT_STATUS_IS_OK(nt_status)) {
 352                         DEBUG(10, ("Failed to obtain server credentials, perhaps a standalone server?: %s\n", nt_errstr(nt_status)));
 353                         talloc_free(server_credentials);
 354                         server_credentials = NULL;
 355                 }
 356
 357                 nt_status = samba_server_gensec_start(req,
 358                                                       req->smb_conn->connection->event.ctx,
 359                                                       req->smb_conn->connection->msg_ctx,
 360                                                       req->smb_conn->lp_ctx,
 361                                                       server_credentials,
 362                                                       "cifs",
 363                                                       &gensec_security);
 364
 365                 if (!NT_STATUS_IS_OK(nt_status)) {
 366                         DEBUG(0, ("Failed to start GENSEC: %s\n", nt_errstr(nt_status)));
 367                         smbsrv_terminate_connection(req->smb_conn, "Failed to start GENSEC\n");
 368                         return;
 369                 }
 370
 371                 if (req->smb_conn->negotiate.auth_context) {
 372                         smbsrv_terminate_connection(req->smb_conn, "reply_nt1: is this a secondary negprot?  auth_context is non-NULL!\n");
 373                         return;
 374                 }
 375                 req->smb_conn->negotiate.server_credentials = talloc_reparent(req, req->smb_conn, server_credentials);
 376
 377                 oid = GENSEC_OID_SPNEGO;
 378                 nt_status = gensec_start_mech_by_oid(gensec_security, oid);
 379
 380                 if (NT_STATUS_IS_OK(nt_status)) {
 381                         /* Get and push the proposed OID list into the packets */
 382                         nt_status = gensec_update(gensec_security, req, req->smb_conn->connection->event.ctx, null_data_blob, &blob);
 383
 384                         if (!NT_STATUS_IS_OK(nt_status) && !NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 385                                 DEBUG(1, ("Failed to get SPNEGO to give us the first token: %s\n", nt_errstr(nt_status)));
 386                         }
 387                 }
 388
 389                 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 390                         DEBUG(3,("using SPNEGO\n"));
 391                 } else {
 392                         DEBUG(5, ("Failed to start SPNEGO, falling back to NTLMSSP only: %s\n", nt_errstr(nt_status)));
 393                         oid = GENSEC_OID_NTLMSSP;
 394                         nt_status = gensec_start_mech_by_oid(gensec_security, oid);
 395
 396                         if (!NT_STATUS_IS_OK(nt_status)) {
 397                                 DEBUG(0, ("Failed to start SPNEGO as well as NTLMSSP fallback: %s\n", nt_errstr(nt_status)));
 398                                 reply_nt1_orig(req);
 399                                 return;
 400                         }
 401                         /* NTLMSSP is a client-first exchange */
 402                         blob = data_blob(NULL, 0);
 403                         DEBUG(3,("using raw-NTLMSSP\n"));
 404                 }
 405
 406                 req->smb_conn->negotiate.oid = oid;
 407
 408                 req_grow_data(req, blob.length + 16);
 409                 /* a NOT very random guid, perhaps we should get it
 410                  * from the credentials (kitchen sink...) */
 411                 memset(req->out.ptr, '\0', 16);
 412                 req->out.ptr += 16;
 413
 414                 memcpy(req->out.ptr, blob.data, blob.length);
 415                 SCVAL(req->out.vwv+1, VWV(16), blob.length + 16);
 416                 req->out.ptr += blob.length;
 417         }
 418
 419         smbsrv_send_reply_nosign(req);
 420 }
 421
 422 /****************************************************************************
 423  Reply for the SMB2 2.001 protocol
 424 ****************************************************************************/
 425 static void reply_smb2(struct smbsrv_request *req, uint16_t choice)
 426 {
 427         struct smbsrv_connection *smb_conn = req->smb_conn;
 428         NTSTATUS status;
 429
 430         talloc_free(smb_conn->sessions.idtree_vuid);
 431         ZERO_STRUCT(smb_conn->sessions);
 432         talloc_free(smb_conn->smb_tcons.idtree_tid);
 433         ZERO_STRUCT(smb_conn->smb_tcons);
 434         ZERO_STRUCT(smb_conn->signing);
 435
 436         /* reply with a SMB2 packet */
 437         status = smbsrv_init_smb2_connection(smb_conn);
 438         if (!NT_STATUS_IS_OK(status)) {
 439                 smbsrv_terminate_connection(smb_conn, nt_errstr(status));
 440                 talloc_free(req);
 441                 return;
 442         }
 443         packet_set_callback(smb_conn->packet, smbsrv_recv_smb2_request);
 444         smb2srv_reply_smb_negprot(req);
 445         req = NULL;
 446 }
 447
 448 /* List of supported protocols, most desired first */
 449 static const struct {
 450         const char *proto_name;
 451         const char *short_name;
 452         void (*proto_reply_fn)(struct smbsrv_request *req, uint16_t choice);
 453         int protocol_level;
 454 } supported_protocols[] = {
 455         {"SMB 2.002",                   "SMB2",         reply_smb2,     PROTOCOL_SMB2_02},
 456         {"NT LANMAN 1.0",               "NT1",          reply_nt1,      PROTOCOL_NT1},
 457         {"NT LM 0.12",                  "NT1",          reply_nt1,      PROTOCOL_NT1},
 458         {"LANMAN2.1",                   "LANMAN2",      reply_lanman2,  PROTOCOL_LANMAN2},
 459         {"LM1.2X002",                   "LANMAN2",      reply_lanman2,  PROTOCOL_LANMAN2},
 460         {"Samba",                       "LANMAN2",      reply_lanman2,  PROTOCOL_LANMAN2},
 461         {"DOS LM1.2X002",               "LANMAN2",      reply_lanman2,  PROTOCOL_LANMAN2},
 462         {"Windows for Workgroups 3.1a", "LANMAN1",      reply_lanman1,  PROTOCOL_LANMAN1},
 463         {"LANMAN1.0",                   "LANMAN1",      reply_lanman1,  PROTOCOL_LANMAN1},
 464         {"MICROSOFT NETWORKS 3.0",      "LANMAN1",      reply_lanman1,  PROTOCOL_LANMAN1},
 465         {"MICROSOFT NETWORKS 1.03",     "COREPLUS",     reply_coreplus, PROTOCOL_COREPLUS},
 466         {"PC NETWORK PROGRAM 1.0",      "CORE",         reply_corep,    PROTOCOL_CORE},
 467         {NULL,NULL,NULL,0},
 468 };
 469
 470 /****************************************************************************
 471  Reply to a negprot.
 472 ****************************************************************************/
 473
 474 void smbsrv_reply_negprot(struct smbsrv_request *req)
 475 {
 476         int protocol;
 477         uint8_t *p;
 478         uint32_t protos_count = 0;
 479         char **protos = NULL;
 480
 481         if (req->smb_conn->negotiate.done_negprot) {
 482                 smbsrv_terminate_connection(req->smb_conn, "multiple negprot's are not permitted");
 483                 return;
 484         }
 485         req->smb_conn->negotiate.done_negprot = true;
 486
 487         p = req->in.data;
 488         while (true) {
 489                 size_t len;
 490
 491                 protos = talloc_realloc(req, protos, char *, protos_count + 1);
 492                 if (!protos) {
 493                         smbsrv_terminate_connection(req->smb_conn, nt_errstr(NT_STATUS_NO_MEMORY));
 494                         return;
 495                 }
 496                 protos[protos_count] = NULL;
 497                 len = req_pull_ascii4(&req->in.bufinfo, (const char **)&protos[protos_count], p, STR_ASCII|STR_TERMINATE);
 498                 p += len;
 499                 if (len == 0 || !protos[protos_count]) break;
 500
 501                 DEBUG(5,("Requested protocol [%d][%s]\n", protos_count, protos[protos_count]));
 502                 protos_count++;
 503         }
 504
 505         /* Check for protocols, most desirable first */
 506         for (protocol = 0; supported_protocols[protocol].proto_name; protocol++) {
 507                 int i;
 508
 509                 if (supported_protocols[protocol].protocol_level > lpcfg_srv_maxprotocol(req->smb_conn->lp_ctx))
 510                         continue;
 511                 if (supported_protocols[protocol].protocol_level < lpcfg_srv_minprotocol(req->smb_conn->lp_ctx))
 512                         continue;
 513
 514                 for (i = 0; i < protos_count; i++) {
 515                         if (strcmp(supported_protocols[protocol].proto_name, protos[i]) != 0) continue;
 516
 517                         supported_protocols[protocol].proto_reply_fn(req, i);
 518                         DEBUG(3,("Selected protocol [%d][%s]\n",
 519                                 i, supported_protocols[protocol].proto_name));
 520                         return;
 521                 }
 522         }
 523
 524         smbsrv_terminate_connection(req->smb_conn, "No protocol supported !");
 525 }