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;
  92         if (lpcfg_async_smb_echo_handler(req->smb_conn->lp_ctx)) {
  93                 raw = 0;
  94         } else {
  95                 raw = (lpcfg_read_raw(req->smb_conn->lp_ctx)?1:0) |
  96                       (lpcfg_write_raw(req->smb_conn->lp_ctx)?2:0);
  97         }
  98
  99         smbsrv_setup_reply(req, 13, 0);
 100
 101         /* Reply, SMBlockread, SMBwritelock supported. */
 102         SCVAL(req->out.hdr,HDR_FLG,
 103               CVAL(req->out.hdr, HDR_FLG) | FLAG_SUPPORT_LOCKREAD);
 104
 105         SSVAL(req->out.vwv, VWV(0), choice);
 106         SSVAL(req->out.vwv, VWV(1), 0x1); /* user level security, don't encrypt */
 107
 108         /* tell redirector we support
 109            readbraw and writebraw (possibly) */
 110         SSVAL(req->out.vwv, VWV(5), raw);
 111
 112         req->smb_conn->negotiate.protocol = PROTOCOL_COREPLUS;
 113
 114         if (req->smb_conn->signing.mandatory_signing) {
 115                 smbsrv_terminate_connection(req->smb_conn,
 116                                             "COREPLUS does not support SMB signing, and it is mandatory\n");
 117                 return;
 118         }
 119
 120         smbsrv_send_reply(req);
 121 }
 122
 123 /****************************************************************************
 124  Reply for the lanman 1.0 protocol.
 125 ****************************************************************************/
 126 static void reply_lanman1(struct smbsrv_request *req, uint16_t choice)
 127 {
 128         int secword=0;
 129         time_t t = req->request_time.tv_sec;
 130         uint16_t raw;
 131
 132         if (lpcfg_async_smb_echo_handler(req->smb_conn->lp_ctx)) {
 133                 raw = 0;
 134         } else {
 135                 raw = (lpcfg_read_raw(req->smb_conn->lp_ctx)?1:0) |
 136                       (lpcfg_write_raw(req->smb_conn->lp_ctx)?2:0);
 137         }
 138
 139         req->smb_conn->negotiate.encrypted_passwords = lpcfg_encrypt_passwords(req->smb_conn->lp_ctx);
 140
 141         if (req->smb_conn->negotiate.encrypted_passwords)
 142                 secword |= NEGOTIATE_SECURITY_CHALLENGE_RESPONSE;
 143
 144         req->smb_conn->negotiate.protocol = PROTOCOL_LANMAN1;
 145
 146         smbsrv_setup_reply(req, 13, req->smb_conn->negotiate.encrypted_passwords ? 8 : 0);
 147
 148         /* SMBlockread, SMBwritelock supported. */
 149         SCVAL(req->out.hdr,HDR_FLG,
 150               CVAL(req->out.hdr, HDR_FLG) | FLAG_SUPPORT_LOCKREAD);
 151
 152         SSVAL(req->out.vwv, VWV(0), choice);
 153         SSVAL(req->out.vwv, VWV(1), secword);
 154         SSVAL(req->out.vwv, VWV(2), req->smb_conn->negotiate.max_recv);
 155         SSVAL(req->out.vwv, VWV(3), lpcfg_max_mux(req->smb_conn->lp_ctx));
 156         SSVAL(req->out.vwv, VWV(4), 1);
 157         SSVAL(req->out.vwv, VWV(5), raw);
 158         SIVAL(req->out.vwv, VWV(6), req->smb_conn->connection->server_id.pid);
 159         srv_push_dos_date(req->smb_conn, req->out.vwv, VWV(8), t);
 160         SSVAL(req->out.vwv, VWV(10), req->smb_conn->negotiate.zone_offset/60);
 161         SIVAL(req->out.vwv, VWV(11), 0); /* reserved */
 162
 163         /* Create a token value and add it to the outgoing packet. */
 164         if (req->smb_conn->negotiate.encrypted_passwords) {
 165                 NTSTATUS nt_status;
 166
 167                 SSVAL(req->out.vwv, VWV(11), 8);
 168
 169                 nt_status = get_challenge(req->smb_conn, req->out.data);
 170                 if (!NT_STATUS_IS_OK(nt_status)) {
 171                         smbsrv_terminate_connection(req->smb_conn, "LANMAN1 get_challenge failed\n");
 172                         return;
 173                 }
 174         }
 175
 176         if (req->smb_conn->signing.mandatory_signing) {
 177                 smbsrv_terminate_connection(req->smb_conn,
 178                                             "LANMAN1 does not support SMB signing, and it is mandatory\n");
 179                 return;
 180         }
 181
 182         smbsrv_send_reply(req);
 183 }
 184
 185 /****************************************************************************
 186  Reply for the lanman 2.0 protocol.
 187 ****************************************************************************/
 188 static void reply_lanman2(struct smbsrv_request *req, uint16_t choice)
 189 {
 190         int secword=0;
 191         time_t t = req->request_time.tv_sec;
 192         uint16_t raw;
 193         if (lpcfg_async_smb_echo_handler(req->smb_conn->lp_ctx)) {
 194                 raw = 0;
 195         } else {
 196                 raw = (lpcfg_read_raw(req->smb_conn->lp_ctx)?1:0) |
 197                       (lpcfg_write_raw(req->smb_conn->lp_ctx)?2:0);
 198         }
 199
 200         req->smb_conn->negotiate.encrypted_passwords = lpcfg_encrypt_passwords(req->smb_conn->lp_ctx);
 201
 202         if (req->smb_conn->negotiate.encrypted_passwords)
 203                 secword |= NEGOTIATE_SECURITY_CHALLENGE_RESPONSE;
 204
 205         req->smb_conn->negotiate.protocol = PROTOCOL_LANMAN2;
 206
 207         smbsrv_setup_reply(req, 13, 0);
 208
 209         SSVAL(req->out.vwv, VWV(0), choice);
 210         SSVAL(req->out.vwv, VWV(1), secword);
 211         SSVAL(req->out.vwv, VWV(2), req->smb_conn->negotiate.max_recv);
 212         SSVAL(req->out.vwv, VWV(3), lpcfg_max_mux(req->smb_conn->lp_ctx));
 213         SSVAL(req->out.vwv, VWV(4), 1);
 214         SSVAL(req->out.vwv, VWV(5), raw);
 215         SIVAL(req->out.vwv, VWV(6), req->smb_conn->connection->server_id.pid);
 216         srv_push_dos_date(req->smb_conn, req->out.vwv, VWV(8), t);
 217         SSVAL(req->out.vwv, VWV(10), req->smb_conn->negotiate.zone_offset/60);
 218         SIVAL(req->out.vwv, VWV(11), 0);
 219
 220         /* Create a token value and add it to the outgoing packet. */
 221         if (req->smb_conn->negotiate.encrypted_passwords) {
 222                 SSVAL(req->out.vwv, VWV(11), 8);
 223                 req_grow_data(req, 8);
 224                 get_challenge(req->smb_conn, req->out.data);
 225         }
 226
 227         req_push_str(req, NULL, lpcfg_workgroup(req->smb_conn->lp_ctx), -1, STR_TERMINATE);
 228
 229         if (req->smb_conn->signing.mandatory_signing) {
 230                 smbsrv_terminate_connection(req->smb_conn,
 231                                             "LANMAN2 does not support SMB signing, and it is mandatory\n");
 232                 return;
 233         }
 234
 235         smbsrv_send_reply(req);
 236 }
 237
 238 static void reply_nt1_orig(struct smbsrv_request *req)
 239 {
 240         /* Create a token value and add it to the outgoing packet. */
 241         if (req->smb_conn->negotiate.encrypted_passwords) {
 242                 req_grow_data(req, 8);
 243                 /* note that we do not send a challenge at all if
 244                    we are using plaintext */
 245                 get_challenge(req->smb_conn, req->out.ptr);
 246                 req->out.ptr += 8;
 247                 SCVAL(req->out.vwv+1, VWV(16), 8);
 248         }
 249         req_push_str(req, NULL, lpcfg_workgroup(req->smb_conn->lp_ctx), -1, STR_UNICODE|STR_TERMINATE|STR_NOALIGN);
 250         req_push_str(req, NULL, lpcfg_netbios_name(req->smb_conn->lp_ctx), -1, STR_UNICODE|STR_TERMINATE|STR_NOALIGN);
 251         DEBUG(3,("not using extended security (SPNEGO or NTLMSSP)\n"));
 252 }
 253
 254 /****************************************************************************
 255  Reply for the nt protocol.
 256 ****************************************************************************/
 257 static void reply_nt1(struct smbsrv_request *req, uint16_t choice)
 258 {
 259         /* dual names + lock_and_read + nt SMBs + remote API calls */
 260         int capabilities;
 261         int secword=0;
 262         time_t t = req->request_time.tv_sec;
 263         NTTIME nttime;
 264         bool negotiate_spnego = false;
 265         char *large_test_path;
 266
 267         unix_to_nt_time(&nttime, t);
 268
 269         capabilities =
 270                 CAP_NT_FIND | CAP_LOCK_AND_READ |
 271                 CAP_LEVEL_II_OPLOCKS | CAP_NT_SMBS | CAP_RPC_REMOTE_APIS;
 272
 273         req->smb_conn->negotiate.encrypted_passwords = lpcfg_encrypt_passwords(req->smb_conn->lp_ctx);
 274
 275         /* do spnego in user level security if the client
 276            supports it and we can do encrypted passwords */
 277
 278         if (req->smb_conn->negotiate.encrypted_passwords &&
 279             lpcfg_use_spnego(req->smb_conn->lp_ctx) &&
 280             (req->flags2 & FLAGS2_EXTENDED_SECURITY)) {
 281                 negotiate_spnego = true;
 282                 capabilities |= CAP_EXTENDED_SECURITY;
 283         }
 284
 285         if (lpcfg_large_readwrite(req->smb_conn->lp_ctx)) {
 286                 capabilities |= CAP_LARGE_READX | CAP_LARGE_WRITEX | CAP_W2K_SMBS;
 287         }
 288
 289         large_test_path = lpcfg_lock_path(req, req->smb_conn->lp_ctx, "large_test.dat");
 290         if (large_file_support(large_test_path)) {
 291                 capabilities |= CAP_LARGE_FILES;
 292         }
 293
 294         if (!lpcfg_async_smb_echo_handler(req->smb_conn->lp_ctx) &&
 295             lpcfg_read_raw(req->smb_conn->lp_ctx) &&
 296             lpcfg_write_raw(req->smb_conn->lp_ctx)) {
 297                 capabilities |= CAP_RAW_MODE;
 298         }
 299
 300         /* allow for disabling unicode */
 301         if (lpcfg_unicode(req->smb_conn->lp_ctx)) {
 302                 capabilities |= CAP_UNICODE;
 303         }
 304
 305         if (lpcfg_nt_status_support(req->smb_conn->lp_ctx)) {
 306                 capabilities |= CAP_STATUS32;
 307         }
 308
 309         if (lpcfg_host_msdfs(req->smb_conn->lp_ctx)) {
 310                 capabilities |= CAP_DFS;
 311         }
 312
 313         secword |= NEGOTIATE_SECURITY_USER_LEVEL;
 314
 315         if (req->smb_conn->negotiate.encrypted_passwords) {
 316                 secword |= NEGOTIATE_SECURITY_CHALLENGE_RESPONSE;
 317         }
 318
 319         if (req->smb_conn->signing.allow_smb_signing) {
 320                 secword |= NEGOTIATE_SECURITY_SIGNATURES_ENABLED;
 321         }
 322
 323         if (req->smb_conn->signing.mandatory_signing) {
 324                 secword |= NEGOTIATE_SECURITY_SIGNATURES_REQUIRED;
 325         }
 326
 327         req->smb_conn->negotiate.protocol = PROTOCOL_NT1;
 328
 329         smbsrv_setup_reply(req, 17, 0);
 330
 331         SSVAL(req->out.vwv, VWV(0), choice);
 332         SCVAL(req->out.vwv, VWV(1), secword);
 333
 334         /* notice the strange +1 on vwv here? That's because
 335            this is the one and only SMB packet that is malformed in
 336            the specification - all the command words after the secword
 337            are offset by 1 byte */
 338         SSVAL(req->out.vwv+1, VWV(1), lpcfg_max_mux(req->smb_conn->lp_ctx));
 339         SSVAL(req->out.vwv+1, VWV(2), 1); /* num vcs */
 340         SIVAL(req->out.vwv+1, VWV(3), req->smb_conn->negotiate.max_recv);
 341         SIVAL(req->out.vwv+1, VWV(5), 0x10000); /* raw size. full 64k */
 342         SIVAL(req->out.vwv+1, VWV(7), req->smb_conn->connection->server_id.pid); /* session key */
 343
 344         SIVAL(req->out.vwv+1, VWV(9), capabilities);
 345         push_nttime(req->out.vwv+1, VWV(11), nttime);
 346         SSVALS(req->out.vwv+1,VWV(15), req->smb_conn->negotiate.zone_offset/60);
 347
 348         if (!negotiate_spnego) {
 349                 reply_nt1_orig(req);
 350         } else {
 351                 struct cli_credentials *server_credentials;
 352                 struct gensec_security *gensec_security;
 353                 DATA_BLOB null_data_blob = data_blob(NULL, 0);
 354                 DATA_BLOB blob;
 355                 const char *oid;
 356                 NTSTATUS nt_status;
 357
 358                 server_credentials
 359                         = cli_credentials_init(req);
 360                 if (!server_credentials) {
 361                         smbsrv_terminate_connection(req->smb_conn, "Failed to init server credentials\n");
 362                         return;
 363                 }
 364
 365                 cli_credentials_set_conf(server_credentials, req->smb_conn->lp_ctx);
 366                 nt_status = cli_credentials_set_machine_account(server_credentials, req->smb_conn->lp_ctx);
 367                 if (!NT_STATUS_IS_OK(nt_status)) {
 368                         DEBUG(10, ("Failed to obtain server credentials, perhaps a standalone server?: %s\n", nt_errstr(nt_status)));
 369                         talloc_free(server_credentials);
 370                         server_credentials = NULL;
 371                 }
 372
 373                 nt_status = samba_server_gensec_start(req,
 374                                                       req->smb_conn->connection->event.ctx,
 375                                                       req->smb_conn->connection->msg_ctx,
 376                                                       req->smb_conn->lp_ctx,
 377                                                       server_credentials,
 378                                                       "cifs",
 379                                                       &gensec_security);
 380
 381                 if (!NT_STATUS_IS_OK(nt_status)) {
 382                         DEBUG(0, ("Failed to start GENSEC: %s\n", nt_errstr(nt_status)));
 383                         smbsrv_terminate_connection(req->smb_conn, "Failed to start GENSEC\n");
 384                         return;
 385                 }
 386
 387                 if (req->smb_conn->negotiate.auth_context) {
 388                         smbsrv_terminate_connection(req->smb_conn, "reply_nt1: is this a secondary negprot?  auth_context is non-NULL!\n");
 389                         return;
 390                 }
 391                 req->smb_conn->negotiate.server_credentials = talloc_reparent(req, req->smb_conn, server_credentials);
 392
 393                 oid = GENSEC_OID_SPNEGO;
 394                 nt_status = gensec_start_mech_by_oid(gensec_security, oid);
 395
 396                 if (NT_STATUS_IS_OK(nt_status)) {
 397                         /* Get and push the proposed OID list into the packets */
 398                         nt_status = gensec_update_ev(gensec_security, req, req->smb_conn->connection->event.ctx, null_data_blob, &blob);
 399
 400                         if (!NT_STATUS_IS_OK(nt_status) && !NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 401                                 DEBUG(1, ("Failed to get SPNEGO to give us the first token: %s\n", nt_errstr(nt_status)));
 402                         }
 403                 }
 404
 405                 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 406                         DEBUG(3,("using SPNEGO\n"));
 407                 } else {
 408                         DEBUG(5, ("Failed to start SPNEGO, falling back to NTLMSSP only: %s\n", nt_errstr(nt_status)));
 409                         oid = GENSEC_OID_NTLMSSP;
 410                         nt_status = gensec_start_mech_by_oid(gensec_security, oid);
 411
 412                         if (!NT_STATUS_IS_OK(nt_status)) {
 413                                 DEBUG(0, ("Failed to start SPNEGO as well as NTLMSSP fallback: %s\n", nt_errstr(nt_status)));
 414                                 reply_nt1_orig(req);
 415                                 return;
 416                         }
 417                         /* NTLMSSP is a client-first exchange */
 418                         blob = data_blob(NULL, 0);
 419                         DEBUG(3,("using raw-NTLMSSP\n"));
 420                 }
 421
 422                 req->smb_conn->negotiate.oid = oid;
 423
 424                 req_grow_data(req, blob.length + 16);
 425                 /* a NOT very random guid, perhaps we should get it
 426                  * from the credentials (kitchen sink...) */
 427                 memset(req->out.ptr, '\0', 16);
 428                 req->out.ptr += 16;
 429
 430                 memcpy(req->out.ptr, blob.data, blob.length);
 431                 SCVAL(req->out.vwv+1, VWV(16), blob.length + 16);
 432                 req->out.ptr += blob.length;
 433         }
 434
 435         smbsrv_send_reply_nosign(req);
 436 }
 437
 438 /****************************************************************************
 439  Reply for the SMB2 2.001 protocol
 440 ****************************************************************************/
 441 static void reply_smb2(struct smbsrv_request *req, uint16_t choice)
 442 {
 443         struct smbsrv_connection *smb_conn = req->smb_conn;
 444         NTSTATUS status;
 445
 446         talloc_free(smb_conn->sessions.idtree_vuid);
 447         ZERO_STRUCT(smb_conn->sessions);
 448         talloc_free(smb_conn->smb_tcons.idtree_tid);
 449         ZERO_STRUCT(smb_conn->smb_tcons);
 450         ZERO_STRUCT(smb_conn->signing);
 451
 452         /* reply with a SMB2 packet */
 453         status = smbsrv_init_smb2_connection(smb_conn);
 454         if (!NT_STATUS_IS_OK(status)) {
 455                 smbsrv_terminate_connection(smb_conn, nt_errstr(status));
 456                 talloc_free(req);
 457                 return;
 458         }
 459         packet_set_callback(smb_conn->packet, smbsrv_recv_smb2_request);
 460         smb2srv_reply_smb_negprot(req);
 461         req = NULL;
 462 }
 463
 464 /* List of supported protocols, most desired first */
 465 static const struct {
 466         const char *proto_name;
 467         const char *short_name;
 468         void (*proto_reply_fn)(struct smbsrv_request *req, uint16_t choice);
 469         int protocol_level;
 470 } supported_protocols[] = {
 471         {"SMB 2.002",                   "SMB2",         reply_smb2,     PROTOCOL_SMB2_02},
 472         {"NT LANMAN 1.0",               "NT1",          reply_nt1,      PROTOCOL_NT1},
 473         {"NT LM 0.12",                  "NT1",          reply_nt1,      PROTOCOL_NT1},
 474         {"LANMAN2.1",                   "LANMAN2",      reply_lanman2,  PROTOCOL_LANMAN2},
 475         {"LM1.2X002",                   "LANMAN2",      reply_lanman2,  PROTOCOL_LANMAN2},
 476         {"Samba",                       "LANMAN2",      reply_lanman2,  PROTOCOL_LANMAN2},
 477         {"DOS LM1.2X002",               "LANMAN2",      reply_lanman2,  PROTOCOL_LANMAN2},
 478         {"Windows for Workgroups 3.1a", "LANMAN1",      reply_lanman1,  PROTOCOL_LANMAN1},
 479         {"LANMAN1.0",                   "LANMAN1",      reply_lanman1,  PROTOCOL_LANMAN1},
 480         {"MICROSOFT NETWORKS 3.0",      "LANMAN1",      reply_lanman1,  PROTOCOL_LANMAN1},
 481         {"MICROSOFT NETWORKS 1.03",     "COREPLUS",     reply_coreplus, PROTOCOL_COREPLUS},
 482         {"PC NETWORK PROGRAM 1.0",      "CORE",         reply_corep,    PROTOCOL_CORE},
 483         {NULL,NULL,NULL,0},
 484 };
 485
 486 /****************************************************************************
 487  Reply to a negprot.
 488 ****************************************************************************/
 489
 490 void smbsrv_reply_negprot(struct smbsrv_request *req)
 491 {
 492         int protocol;
 493         uint8_t *p;
 494         uint32_t protos_count = 0;
 495         const char **protos = NULL;
 496
 497         if (req->smb_conn->negotiate.done_negprot) {
 498                 smbsrv_terminate_connection(req->smb_conn, "multiple negprot's are not permitted");
 499                 return;
 500         }
 501         req->smb_conn->negotiate.done_negprot = true;
 502
 503         p = req->in.data;
 504         while (true) {
 505                 size_t len;
 506
 507                 protos = talloc_realloc(req, protos, const char *, protos_count + 1);
 508                 if (!protos) {
 509                         smbsrv_terminate_connection(req->smb_conn, nt_errstr(NT_STATUS_NO_MEMORY));
 510                         return;
 511                 }
 512                 protos[protos_count] = NULL;
 513                 len = req_pull_ascii4(&req->in.bufinfo, &protos[protos_count], p, STR_ASCII|STR_TERMINATE);
 514                 p += len;
 515                 if (len == 0 || !protos[protos_count]) break;
 516
 517                 DEBUG(5,("Requested protocol [%d][%s]\n", protos_count, protos[protos_count]));
 518                 protos_count++;
 519         }
 520
 521         /* Check for protocols, most desirable first */
 522         for (protocol = 0; supported_protocols[protocol].proto_name; protocol++) {
 523                 int i;
 524
 525                 if (supported_protocols[protocol].protocol_level > lpcfg_server_max_protocol(req->smb_conn->lp_ctx))
 526                         continue;
 527                 if (supported_protocols[protocol].protocol_level < lpcfg_server_min_protocol(req->smb_conn->lp_ctx))
 528                         continue;
 529
 530                 for (i = 0; i < protos_count; i++) {
 531                         if (strcmp(supported_protocols[protocol].proto_name, protos[i]) != 0) continue;
 532
 533                         supported_protocols[protocol].proto_reply_fn(req, i);
 534                         DEBUG(3,("Selected protocol [%d][%s]\n",
 535                                 i, supported_protocols[protocol].proto_name));
 536                         return;
 537                 }
 538         }
 539
 540         smbsrv_terminate_connection(req->smb_conn, "No protocol supported !");
 541 }