source3/nmbd/nmbd_processlogon.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    NBT netbios routines and daemon - version 2
   4    Copyright (C) Andrew Tridgell 1994-1998
   5    Copyright (C) Luke Kenneth Casson Leighton 1994-1998
   6    Copyright (C) Jeremy Allison 1994-2003
   7    Copyright (C) Jim McDonough <jmcd@us.ibm.com> 2002
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21
  22    Revision History:
  23
  24 */
  25
  26 #include "includes.h"
  27 #include "../libcli/netlogon/netlogon.h"
  28 #include "../libcli/cldap/cldap.h"
  29 #include "../lib/tsocket/tsocket.h"
  30 #include "../libcli/security/security.h"
  31 #include "secrets.h"
  32 #include "nmbd/nmbd.h"
  33
  34 struct sam_database_info {
  35         uint32 index;
  36         uint32 serial_lo, serial_hi;
  37         uint32 date_lo, date_hi;
  38 };
  39
  40 /**
  41  * check whether the client belongs to the hosts
  42  * for which initial logon should be delayed...
  43  */
  44 static bool delay_logon(const char *peer_name, const char *peer_addr)
  45 {
  46         const char **delay_list = lp_init_logon_delayed_hosts();
  47         const char *peer[2];
  48
  49         if (delay_list == NULL) {
  50                 return False;
  51         }
  52
  53         peer[0] = peer_name;
  54         peer[1] = peer_addr;
  55
  56         return list_match(delay_list, (const char *)peer, client_match);
  57 }
  58
  59 static void delayed_init_logon_handler(struct event_context *event_ctx,
  60                                        struct timed_event *te,
  61                                        struct timeval now,
  62                                        void *private_data)
  63 {
  64         struct packet_struct *p = (struct packet_struct *)private_data;
  65
  66         DEBUG(10, ("delayed_init_logon_handler (%lx): re-queuing packet.\n",
  67                    (unsigned long)te));
  68
  69         queue_packet(p);
  70
  71         TALLOC_FREE(te);
  72 }
  73
  74 struct nmbd_proxy_logon_context {
  75         struct cldap_socket *cldap_sock;
  76 };
  77
  78 static struct nmbd_proxy_logon_context *global_nmbd_proxy_logon;
  79
  80 bool initialize_nmbd_proxy_logon(void)
  81 {
  82         const char *cldap_server = lp_parm_const_string(-1, "nmbd_proxy_logon",
  83                                                         "cldap_server", NULL);
  84         struct nmbd_proxy_logon_context *ctx;
  85         NTSTATUS status;
  86         struct in_addr addr;
  87         char addrstr[INET_ADDRSTRLEN];
  88         const char *server_str;
  89         int ret;
  90         struct tsocket_address *server_addr;
  91
  92         if (!cldap_server) {
  93                 return true;
  94         }
  95
  96         addr = interpret_addr2(cldap_server);
  97         server_str = inet_ntop(AF_INET, &addr,
  98                              addrstr, sizeof(addrstr));
  99         if (!server_str || strcmp("0.0.0.0", server_str) == 0) {
 100                 DEBUG(0,("Failed to resolve[%s] for nmbd_proxy_logon\n",
 101                          cldap_server));
 102                 return false;
 103         }
 104
 105         ctx = talloc_zero(nmbd_event_context(),
 106                           struct nmbd_proxy_logon_context);
 107         if (!ctx) {
 108                 return false;
 109         }
 110
 111         ret = tsocket_address_inet_from_strings(ctx, "ipv4",
 112                                                 server_str, LDAP_PORT,
 113                                                 &server_addr);
 114         if (ret != 0) {
 115                 TALLOC_FREE(ctx);
 116                 status = map_nt_error_from_unix(errno);
 117                 DEBUG(0,("Failed to create cldap tsocket_address for %s - %s\n",
 118                          server_str, nt_errstr(status)));
 119                 return false;
 120         }
 121
 122         /* we create a connected udp socket */
 123         status = cldap_socket_init(ctx, NULL, server_addr, &ctx->cldap_sock);
 124         TALLOC_FREE(server_addr);
 125         if (!NT_STATUS_IS_OK(status)) {
 126                 TALLOC_FREE(ctx);
 127                 DEBUG(0,("failed to create cldap socket for %s: %s\n",
 128                         server_str, nt_errstr(status)));
 129                 return false;
 130         }
 131
 132         global_nmbd_proxy_logon = ctx;
 133         return true;
 134 }
 135
 136 struct nmbd_proxy_logon_state {
 137         struct in_addr local_ip;
 138         struct packet_struct *p;
 139         const char *remote_name;
 140         uint8_t remote_name_type;
 141         const char *remote_mailslot;
 142         struct nbt_netlogon_packet req;
 143         struct nbt_netlogon_response resp;
 144         struct cldap_netlogon io;
 145 };
 146
 147 static int nmbd_proxy_logon_state_destructor(struct nmbd_proxy_logon_state *s)
 148 {
 149         s->p->locked = false;
 150         free_packet(s->p);
 151         return 0;
 152 }
 153
 154 static void nmbd_proxy_logon_done(struct tevent_req *subreq);
 155
 156 static void nmbd_proxy_logon(struct nmbd_proxy_logon_context *ctx,
 157                              struct in_addr local_ip,
 158                              struct packet_struct *p,
 159                              const uint8_t *buf,
 160                              uint32_t len)
 161 {
 162         struct nmbd_proxy_logon_state *state;
 163         enum ndr_err_code ndr_err;
 164         DATA_BLOB blob = data_blob_const(buf, len);
 165         const char *computer_name = NULL;
 166         const char *mailslot_name = NULL;
 167         const char *user_name = NULL;
 168         const char *domain_sid = NULL;
 169         uint32_t acct_control = 0;
 170         uint32_t nt_version = 0;
 171         struct tevent_req *subreq;
 172         fstring source_name;
 173         struct dgram_packet *dgram = &p->packet.dgram;
 174
 175         state = talloc_zero(ctx, struct nmbd_proxy_logon_state);
 176         if (!state) {
 177                 DEBUG(0,("failed to allocate nmbd_proxy_logon_state\n"));
 178                 return;
 179         }
 180
 181         pull_ascii_nstring(source_name, sizeof(source_name), dgram->source_name.name);
 182         state->remote_name = talloc_strdup(state, source_name);
 183         state->remote_name_type = dgram->source_name.name_type,
 184         state->local_ip = local_ip;
 185         state->p = p;
 186
 187         ndr_err = ndr_pull_struct_blob(
 188                 &blob, state, &state->req,
 189                 (ndr_pull_flags_fn_t)ndr_pull_nbt_netlogon_packet);
 190         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 191                 NTSTATUS status = ndr_map_error2ntstatus(ndr_err);
 192                 DEBUG(0,("failed parse nbt_netlogon_packet: %s\n",
 193                         nt_errstr(status)));
 194                 TALLOC_FREE(state);
 195                 return;
 196         }
 197
 198         if (DEBUGLEVEL >= 10) {
 199                 DEBUG(10, ("nmbd_proxy_logon:\n"));
 200                 NDR_PRINT_DEBUG(nbt_netlogon_packet, &state->req);
 201         }
 202
 203         switch (state->req.command) {
 204         case LOGON_SAM_LOGON_REQUEST:
 205                 computer_name   = state->req.req.logon.computer_name;
 206                 user_name       = state->req.req.logon.user_name;
 207                 mailslot_name   = state->req.req.logon.mailslot_name;
 208                 acct_control    = state->req.req.logon.acct_control;
 209                 if (state->req.req.logon.sid_size > 0) {
 210                         domain_sid = dom_sid_string(state,
 211                                                     &state->req.req.logon.sid);
 212                         if (!domain_sid) {
 213                                 DEBUG(0,("failed to get a string for sid\n"));
 214                                 TALLOC_FREE(state);
 215                                 return;
 216                         }
 217                 }
 218                 nt_version      = state->req.req.logon.nt_version;
 219                 break;
 220
 221         default:
 222                 /* this can't happen as the caller already checks the command */
 223                 break;
 224         }
 225
 226         state->remote_mailslot = mailslot_name;
 227
 228         if (user_name && strlen(user_name) == 0) {
 229                 user_name = NULL;
 230         }
 231
 232         if (computer_name && strlen(computer_name) == 0) {
 233                 computer_name = NULL;
 234         }
 235
 236         /*
 237          * as the socket is connected,
 238          * we don't need to specify the destination
 239          */
 240         state->io.in.dest_address       = NULL;
 241         state->io.in.dest_port          = 0;
 242         state->io.in.realm              = NULL;
 243         state->io.in.host               = computer_name;
 244         state->io.in.user               = user_name;
 245         state->io.in.domain_guid        = NULL;
 246         state->io.in.domain_sid         = domain_sid;
 247         state->io.in.acct_control       = acct_control;
 248         state->io.in.version            = nt_version;
 249         state->io.in.map_response       = false;
 250
 251         subreq = cldap_netlogon_send(state, nmbd_event_context(),
 252                                      ctx->cldap_sock,
 253                                      &state->io);
 254         if (!subreq) {
 255                 DEBUG(0,("failed to send cldap netlogon call\n"));
 256                 TALLOC_FREE(state);
 257                 return;
 258         }
 259         tevent_req_set_callback(subreq, nmbd_proxy_logon_done, state);
 260
 261         /* we reply async */
 262         state->p->locked = true;
 263         talloc_set_destructor(state, nmbd_proxy_logon_state_destructor);
 264 }
 265
 266 static void nmbd_proxy_logon_done(struct tevent_req *subreq)
 267 {
 268         struct nmbd_proxy_logon_state *state =
 269                 tevent_req_callback_data(subreq,
 270                 struct nmbd_proxy_logon_state);
 271         NTSTATUS status;
 272         DATA_BLOB response = data_blob_null;
 273
 274         status = cldap_netlogon_recv(subreq, state, &state->io);
 275         if (!NT_STATUS_IS_OK(status)) {
 276                 DEBUG(0,("failed to recv cldap netlogon call: %s\n",
 277                         nt_errstr(status)));
 278                 TALLOC_FREE(state);
 279                 return;
 280         }
 281
 282         status = push_netlogon_samlogon_response(&response, state,
 283                                                  &state->io.out.netlogon);
 284         if (!NT_STATUS_IS_OK(status)) {
 285                 DEBUG(0,("failed to push netlogon_samlogon_response: %s\n",
 286                         nt_errstr(status)));
 287                 TALLOC_FREE(state);
 288                 return;
 289         }
 290
 291         send_mailslot(true, state->remote_mailslot,
 292                       (char *)response.data, response.length,
 293                       lp_netbios_name(), 0x0,
 294                       state->remote_name,
 295                       state->remote_name_type,
 296                       state->p->ip,
 297                       state->local_ip,
 298                       state->p->port);
 299         TALLOC_FREE(state);
 300 }
 301
 302 /****************************************************************************
 303 Process a domain logon packet
 304 **************************************************************************/
 305
 306 void process_logon_packet(struct packet_struct *p, const char *buf,int len,
 307                           const char *mailslot)
 308 {
 309         fstring source_name;
 310         struct dgram_packet *dgram = &p->packet.dgram;
 311         struct sockaddr_storage ss;
 312         const struct sockaddr_storage *pss;
 313         struct in_addr ip;
 314
 315         DATA_BLOB blob_in, blob_out;
 316         enum ndr_err_code ndr_err;
 317         struct nbt_netlogon_packet request;
 318         struct nbt_netlogon_response response;
 319         NTSTATUS status;
 320         const char *pdc_name;
 321
 322         in_addr_to_sockaddr_storage(&ss, p->ip);
 323         pss = iface_ip((struct sockaddr *)&ss);
 324         if (!pss) {
 325                 DEBUG(5,("process_logon_packet:can't find outgoing interface "
 326                         "for packet from IP %s\n",
 327                         inet_ntoa(p->ip) ));
 328                 return;
 329         }
 330         ip = ((const struct sockaddr_in *)pss)->sin_addr;
 331
 332         if (!IS_DC) {
 333                 DEBUG(5,("process_logon_packet: Logon packet received from IP %s and domain \
 334 logons are not enabled.\n", inet_ntoa(p->ip) ));
 335                 return;
 336         }
 337
 338         pull_ascii_nstring(source_name, sizeof(source_name), dgram->source_name.name);
 339
 340         pdc_name = talloc_asprintf(talloc_tos(), "\\\\%s", lp_netbios_name());
 341         if (!pdc_name) {
 342                 return;
 343         }
 344
 345         ZERO_STRUCT(request);
 346
 347         blob_in = data_blob_const(buf, len);
 348
 349         ndr_err = ndr_pull_struct_blob(&blob_in, talloc_tos(), &request,
 350                 (ndr_pull_flags_fn_t)ndr_pull_nbt_netlogon_packet);
 351         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 352                 DEBUG(1,("process_logon_packet: Failed to pull logon packet\n"));
 353                 return;
 354         }
 355
 356         if (DEBUGLEVEL >= 10) {
 357                 NDR_PRINT_DEBUG(nbt_netlogon_packet, &request);
 358         }
 359
 360         DEBUG(4,("process_logon_packet: Logon from %s: code = 0x%x\n",
 361                 inet_ntoa(p->ip), request.command));
 362
 363         switch (request.command) {
 364         case LOGON_REQUEST: {
 365
 366                 struct nbt_netlogon_response2 response2;
 367
 368                 DEBUG(5,("process_logon_packet: Domain login request from %s at IP %s user=%s token=%x\n",
 369                         request.req.logon0.computer_name, inet_ntoa(p->ip),
 370                         request.req.logon0.user_name,
 371                         request.req.logon0.lm20_token));
 372
 373                 response2.command       = LOGON_RESPONSE2;
 374                 response2.pdc_name      = pdc_name;
 375                 response2.lm20_token    = 0xffff;
 376
 377                 response.response_type = NETLOGON_RESPONSE2;
 378                 response.data.response2 = response2;
 379
 380                 status = push_nbt_netlogon_response(&blob_out, talloc_tos(), &response);
 381                 if (!NT_STATUS_IS_OK(status)) {
 382                         DEBUG(0,("process_logon_packet: failed to push packet\n"));
 383                         return;
 384                 }
 385
 386                 if (DEBUGLEVEL >= 10) {
 387                         NDR_PRINT_DEBUG(nbt_netlogon_response2, &response.data.response2);
 388                 }
 389
 390                 send_mailslot(True, request.req.logon0.mailslot_name,
 391                                 (char *)blob_out.data,
 392                                 blob_out.length,
 393                                 lp_netbios_name(), 0x0,
 394                                 source_name,
 395                                 dgram->source_name.name_type,
 396                                 p->ip, ip, p->port);
 397                 break;
 398         }
 399
 400         case LOGON_PRIMARY_QUERY: {
 401
 402                 struct nbt_netlogon_response_from_pdc get_pdc;
 403
 404                 if (!lp_domain_master()) {
 405                         /* We're not Primary Domain Controller -- ignore this */
 406                         return;
 407                 }
 408
 409                 DEBUG(5,("process_logon_packet: GETDC request from %s at IP %s, "
 410                         "reporting %s domain %s 0x%x ntversion=%x lm_nt token=%x lm_20 token=%x\n",
 411                         request.req.pdc.computer_name,
 412                         inet_ntoa(p->ip),
 413                         lp_netbios_name(),
 414                         lp_workgroup(),
 415                         NETLOGON_RESPONSE_FROM_PDC,
 416                         request.req.pdc.nt_version,
 417                         request.req.pdc.lmnt_token,
 418                         request.req.pdc.lm20_token));
 419
 420                 get_pdc.command                 = NETLOGON_RESPONSE_FROM_PDC;
 421                 get_pdc.pdc_name                = lp_netbios_name();
 422                 get_pdc._pad                    = data_blob_null;
 423                 get_pdc.unicode_pdc_name        = lp_netbios_name();
 424                 get_pdc.domain_name             = lp_workgroup();
 425                 get_pdc.nt_version              = NETLOGON_NT_VERSION_1;
 426                 get_pdc.lmnt_token              = 0xffff;
 427                 get_pdc.lm20_token              = 0xffff;
 428
 429                 response.response_type = NETLOGON_GET_PDC;
 430                 response.data.get_pdc = get_pdc;
 431
 432                 status = push_nbt_netlogon_response(&blob_out, talloc_tos(), &response);
 433                 if (!NT_STATUS_IS_OK(status)) {
 434                         DEBUG(0,("process_logon_packet: failed to push packet\n"));
 435                         return;
 436                 }
 437
 438                 if (DEBUGLEVEL >= 10) {
 439                         NDR_PRINT_DEBUG(nbt_netlogon_response_from_pdc, &response.data.get_pdc);
 440                 }
 441
 442                 send_mailslot(True, request.req.pdc.mailslot_name,
 443                         (char *)blob_out.data,
 444                         blob_out.length,
 445                         lp_netbios_name(), 0x0,
 446                         source_name,
 447                         dgram->source_name.name_type,
 448                         p->ip, ip, p->port);
 449
 450                 return;
 451         }
 452
 453         case LOGON_SAM_LOGON_REQUEST: {
 454                 char *source_addr;
 455                 bool user_unknown = false;
 456
 457                 struct netlogon_samlogon_response samlogon;
 458                 struct NETLOGON_SAM_LOGON_RESPONSE_NT40 nt4;
 459
 460                 if (global_nmbd_proxy_logon) {
 461                         nmbd_proxy_logon(global_nmbd_proxy_logon,
 462                                          ip, p, (const uint8_t *)buf, len);
 463                         return;
 464                 }
 465
 466                 source_addr = SMB_STRDUP(inet_ntoa(dgram->header.source_ip));
 467                 if (source_addr == NULL) {
 468                         DEBUG(3, ("out of memory copying client"
 469                                   " address string\n"));
 470                         return;
 471                 }
 472
 473                 DEBUG(5,("process_logon_packet: LOGON_SAM_LOGON_REQUEST request from %s(%s) for %s, returning logon svr %s domain %s code %x token=%x\n",
 474                         request.req.logon.computer_name,
 475                         inet_ntoa(p->ip),
 476                         request.req.logon.user_name,
 477                         pdc_name,
 478                         lp_workgroup(),
 479                         LOGON_SAM_LOGON_RESPONSE,
 480                         request.req.logon.lmnt_token));
 481
 482                 if (!request.req.logon.user_name) {
 483                         user_unknown = true;
 484                 }
 485
 486                 nt4.command             = user_unknown ? LOGON_SAM_LOGON_USER_UNKNOWN :
 487                         LOGON_SAM_LOGON_RESPONSE;
 488                 nt4.pdc_name            = pdc_name;
 489                 nt4.user_name           = request.req.logon.user_name;
 490                 nt4.domain_name         = lp_workgroup();
 491                 nt4.nt_version          = NETLOGON_NT_VERSION_1;
 492                 nt4.lmnt_token          = 0xffff;
 493                 nt4.lm20_token          = 0xffff;
 494
 495                 samlogon.ntver = NETLOGON_NT_VERSION_1;
 496                 samlogon.data.nt4 = nt4;
 497
 498                 if (DEBUGLEVEL >= 10) {
 499                         NDR_PRINT_DEBUG(NETLOGON_SAM_LOGON_RESPONSE_NT40, &nt4);
 500                 }
 501
 502                 response.response_type = NETLOGON_SAMLOGON;
 503                 response.data.samlogon = samlogon;
 504
 505                 status = push_nbt_netlogon_response(&blob_out, talloc_tos(), &response);
 506                 if (!NT_STATUS_IS_OK(status)) {
 507                         DEBUG(0,("process_logon_packet: failed to push packet\n"));
 508                         SAFE_FREE(source_addr);
 509                         return;
 510                 }
 511
 512                 /*
 513                  * handle delay.
 514                  * packets requeued after delay are marked as
 515                  * locked.
 516                  */
 517                 if ((p->locked == False) &&
 518                     (strlen(request.req.logon.user_name) == 0) &&
 519                     delay_logon(source_name, source_addr))
 520                 {
 521                         struct timeval when;
 522
 523                         DEBUG(3, ("process_logon_packet: "
 524                                   "delaying initial logon "
 525                                   "reply for client %s(%s) for "
 526                                   "%u milliseconds\n",
 527                                   source_name, source_addr,
 528                                   lp_init_logon_delay()));
 529
 530                         when = timeval_current_ofs_msec(lp_init_logon_delay());
 531                         p->locked = true;
 532                         event_add_timed(nmbd_event_context(),
 533                                         NULL,
 534                                         when,
 535                                         delayed_init_logon_handler,
 536                                         p);
 537                 } else {
 538                         DEBUG(3, ("process_logon_packet: "
 539                                   "processing delayed initial "
 540                                   "logon reply for client "
 541                                   "%s(%s)\n",
 542                                   source_name, source_addr));
 543                         p->locked = false;
 544                         send_mailslot(true, request.req.logon.mailslot_name,
 545                                 (char *)blob_out.data,
 546                                 blob_out.length,
 547                                 lp_netbios_name(), 0x0,
 548                                 source_name,
 549                                 dgram->source_name.name_type,
 550                                 p->ip, ip, p->port);
 551                 }
 552
 553                 SAFE_FREE(source_addr);
 554
 555                 break;
 556         }
 557
 558         /* Announce change to UAS or SAM.  Send by the domain controller when a
 559         replication event is required. */
 560
 561         case NETLOGON_ANNOUNCE_UAS:
 562                 DEBUG(5, ("Got NETLOGON_ANNOUNCE_UAS\n"));
 563                 break;
 564
 565         default:
 566                 DEBUG(3,("process_logon_packet: Unknown domain request %d\n",
 567                         request.command));
 568                 return;
 569         }
 570 }