source3/libsmb/clidgram.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    client dgram calls
   4    Copyright (C) Andrew Tridgell 1994-1998
   5    Copyright (C) Richard Sharpe 2001
   6    Copyright (C) John Terpstra 2001
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22 #include "includes.h"
  23 #include "libsmb/libsmb.h"
  24 #include "../lib/util/tevent_ntstatus.h"
  25 #include "libsmb/clidgram.h"
  26 #include "libsmb/nmblib.h"
  27 #include "libsmb/unexpected.h"
  28 #include "messages.h"
  29 #include "librpc/gen_ndr/samr.h"
  30 #include "../lib/util/pidfile.h"
  31
  32 /*
  33  * cli_send_mailslot, send a mailslot for client code ...
  34  */
  35
  36 static bool cli_prep_mailslot(bool unique, const char *mailslot,
  37                        uint16_t priority,
  38                        char *buf, int len,
  39                        const char *srcname, int src_type,
  40                        const char *dstname, int dest_type,
  41                        const struct sockaddr_storage *dest_ss,
  42                        int dgm_id,
  43                        struct packet_struct *p)
  44 {
  45         struct dgram_packet *dgram = &p->packet.dgram;
  46         char *ptr, *p2;
  47         char tmp[4];
  48         char addr[INET6_ADDRSTRLEN];
  49
  50         ZERO_STRUCTP(p);
  51
  52         /*
  53          * Next, build the DGRAM ...
  54          */
  55
  56         /* DIRECT GROUP or UNIQUE datagram. */
  57         dgram->header.msg_type = unique ? 0x10 : 0x11;
  58         dgram->header.flags.node_type = M_NODE;
  59         dgram->header.flags.first = True;
  60         dgram->header.flags.more = False;
  61         dgram->header.dgm_id = dgm_id;
  62         /* source ip is filled by nmbd */
  63         dgram->header.dgm_length = 0; /* Let build_dgram() handle this. */
  64         dgram->header.packet_offset = 0;
  65
  66         make_nmb_name(&dgram->source_name,srcname,src_type);
  67         make_nmb_name(&dgram->dest_name,dstname,dest_type);
  68
  69         ptr = &dgram->data[0];
  70
  71         /* Setup the smb part. */
  72         ptr -= 4; /* XXX Ugliness because of handling of tcp SMB length. */
  73         memcpy(tmp,ptr,4);
  74
  75         if (smb_size + 17*2 + strlen(mailslot) + 1 + len > MAX_DGRAM_SIZE) {
  76                 DEBUG(0, ("cli_send_mailslot: Cannot write beyond end of packet\n"));
  77                 return False;
  78         }
  79
  80         cli_set_message(ptr,17,strlen(mailslot) + 1 + len,True);
  81         memcpy(ptr,tmp,4);
  82
  83         SCVAL(ptr,smb_com,SMBtrans);
  84         SSVAL(ptr,smb_vwv1,len);
  85         SSVAL(ptr,smb_vwv11,len);
  86         SSVAL(ptr,smb_vwv12,70 + strlen(mailslot));
  87         SSVAL(ptr,smb_vwv13,3);
  88         SSVAL(ptr,smb_vwv14,1);
  89         SSVAL(ptr,smb_vwv15,priority);
  90         SSVAL(ptr,smb_vwv16,2);
  91         p2 = smb_buf(ptr);
  92         fstrcpy(p2,mailslot);
  93         p2 = skip_string(ptr,MAX_DGRAM_SIZE,p2);
  94         if (!p2) {
  95                 return False;
  96         }
  97
  98         memcpy(p2,buf,len);
  99         p2 += len;
 100
 101         dgram->datasize = PTR_DIFF(p2,ptr+4); /* +4 for tcp length. */
 102
 103         p->packet_type = DGRAM_PACKET;
 104         p->ip = ((const struct sockaddr_in *)dest_ss)->sin_addr;
 105         p->timestamp = time(NULL);
 106
 107         DEBUG(4,("send_mailslot: Sending to mailslot %s from %s ",
 108                  mailslot, nmb_namestr(&dgram->source_name)));
 109         print_sockaddr(addr, sizeof(addr), dest_ss);
 110
 111         DEBUGADD(4,("to %s IP %s\n", nmb_namestr(&dgram->dest_name), addr));
 112
 113         return true;
 114 }
 115
 116 static char *mailslot_name(TALLOC_CTX *mem_ctx, struct in_addr dc_ip)
 117 {
 118         return talloc_asprintf(mem_ctx, "%s%X",
 119                                NBT_MAILSLOT_GETDC, dc_ip.s_addr);
 120 }
 121
 122 static bool prep_getdc_request(const struct sockaddr_storage *dc_ss,
 123                                const char *domain_name,
 124                                const struct dom_sid *sid,
 125                                uint32_t nt_version,
 126                                const char *my_mailslot,
 127                                int dgm_id,
 128                                struct packet_struct *p)
 129 {
 130         TALLOC_CTX *frame = talloc_stackframe();
 131         const char *my_acct_name;
 132         struct nbt_netlogon_packet packet;
 133         struct NETLOGON_SAM_LOGON_REQUEST *s;
 134         enum ndr_err_code ndr_err;
 135         DATA_BLOB blob = data_blob_null;
 136         struct dom_sid my_sid;
 137         bool ret = false;
 138
 139         ZERO_STRUCT(packet);
 140         ZERO_STRUCT(my_sid);
 141
 142         if (sid != NULL) {
 143                 my_sid = *sid;
 144         }
 145
 146         my_acct_name = talloc_asprintf(talloc_tos(), "%s$", lp_netbios_name());
 147         if (my_acct_name == NULL) {
 148                 goto fail;
 149         }
 150
 151         packet.command  = LOGON_SAM_LOGON_REQUEST;
 152         s               = &packet.req.logon;
 153
 154         s->request_count        = 0;
 155         s->computer_name        = lp_netbios_name();
 156         s->user_name            = my_acct_name;
 157         s->mailslot_name        = my_mailslot;
 158         s->acct_control         = ACB_WSTRUST;
 159         s->sid                  = my_sid;
 160         s->nt_version           = nt_version;
 161         s->lmnt_token           = 0xffff;
 162         s->lm20_token           = 0xffff;
 163
 164         if (DEBUGLEVEL >= 10) {
 165                 NDR_PRINT_DEBUG(nbt_netlogon_packet, &packet);
 166         }
 167
 168         ndr_err = ndr_push_struct_blob(&blob, talloc_tos(), &packet,
 169                        (ndr_push_flags_fn_t)ndr_push_nbt_netlogon_packet);
 170         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 171                 goto fail;
 172         }
 173
 174         ret = cli_prep_mailslot(false, NBT_MAILSLOT_NTLOGON, 0,
 175                                 (char *)blob.data, blob.length,
 176                                 lp_netbios_name(), 0, domain_name, 0x1c,
 177                                 dc_ss, dgm_id, p);
 178 fail:
 179         TALLOC_FREE(frame);
 180         return ret;
 181 }
 182
 183 static bool parse_getdc_response(
 184         struct packet_struct *packet,
 185         TALLOC_CTX *mem_ctx,
 186         const char *domain_name,
 187         uint32_t *nt_version,
 188         const char **dc_name,
 189         struct netlogon_samlogon_response **samlogon_response)
 190 {
 191         DATA_BLOB blob;
 192         struct netlogon_samlogon_response *r;
 193         union dgram_message_body p;
 194         enum ndr_err_code ndr_err;
 195         NTSTATUS status;
 196
 197         const char *returned_dc = NULL;
 198         const char *returned_domain = NULL;
 199
 200         blob = data_blob_const(packet->packet.dgram.data,
 201                                packet->packet.dgram.datasize);
 202         if (blob.length < 4) {
 203                 DEBUG(1, ("invalid length: %d\n", (int)blob.length));
 204                 return false;
 205         }
 206
 207         if (RIVAL(blob.data,0) != DGRAM_SMB) {
 208                 DEBUG(1, ("invalid packet\n"));
 209                 return false;
 210         }
 211
 212         blob.data += 4;
 213         blob.length -= 4;
 214
 215         ndr_err = ndr_pull_union_blob_all(&blob, mem_ctx, &p, DGRAM_SMB,
 216                        (ndr_pull_flags_fn_t)ndr_pull_dgram_smb_packet);
 217         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 218                 DEBUG(1, ("failed to parse packet\n"));
 219                 return false;
 220         }
 221
 222         if (p.smb.smb_command != SMB_TRANSACTION) {
 223                 DEBUG(1, ("invalid smb_command: %d\n", p.smb.smb_command));
 224                 return false;
 225         }
 226
 227         if (DEBUGLEVEL >= 10) {
 228                 NDR_PRINT_DEBUG(dgram_smb_packet, &p);
 229         }
 230
 231         blob = p.smb.body.trans.data;
 232
 233         r = talloc_zero(mem_ctx, struct netlogon_samlogon_response);
 234         if (!r) {
 235                 return false;
 236         }
 237
 238         status = pull_netlogon_samlogon_response(&blob, r, r);
 239         if (!NT_STATUS_IS_OK(status)) {
 240                 TALLOC_FREE(r);
 241                 return false;
 242         }
 243
 244         map_netlogon_samlogon_response(r);
 245
 246         /* do we still need this ? */
 247         *nt_version = r->ntver;
 248
 249         returned_domain = r->data.nt5_ex.domain_name;
 250         returned_dc = r->data.nt5_ex.pdc_name;
 251
 252         if (!strequal(returned_domain, domain_name)) {
 253                 DEBUG(3, ("GetDC: Expected domain %s, got %s\n",
 254                           domain_name, returned_domain));
 255                 TALLOC_FREE(r);
 256                 return false;
 257         }
 258
 259         if (*returned_dc == '\\') returned_dc += 1;
 260         if (*returned_dc == '\\') returned_dc += 1;
 261
 262         *dc_name = talloc_strdup(mem_ctx, returned_dc);
 263         if (!*dc_name) {
 264                 TALLOC_FREE(r);
 265                 return false;
 266         }
 267
 268         if (samlogon_response) {
 269                 *samlogon_response = r;
 270         } else {
 271                 TALLOC_FREE(r);
 272         }
 273
 274         DEBUG(10, ("GetDC gave name %s for domain %s\n",
 275                    *dc_name, returned_domain));
 276
 277         return True;
 278 }
 279
 280 struct nbt_getdc_state {
 281         struct tevent_context *ev;
 282         struct messaging_context *msg_ctx;
 283         struct nb_packet_reader *reader;
 284         const char *my_mailslot;
 285         pid_t nmbd_pid;
 286
 287         const struct sockaddr_storage *dc_addr;
 288         const char *domain_name;
 289         const struct dom_sid *sid;
 290         uint32_t nt_version;
 291         const char *dc_name;
 292         struct netlogon_samlogon_response *samlogon_response;
 293
 294         struct packet_struct p;
 295 };
 296
 297 static void nbt_getdc_got_reader(struct tevent_req *subreq);
 298 static void nbt_getdc_got_response(struct tevent_req *subreq);
 299
 300 struct tevent_req *nbt_getdc_send(TALLOC_CTX *mem_ctx,
 301                                   struct tevent_context *ev,
 302                                   struct messaging_context *msg_ctx,
 303                                   const struct sockaddr_storage *dc_addr,
 304                                   const char *domain_name,
 305                                   const struct dom_sid *sid,
 306                                   uint32_t nt_version)
 307 {
 308         struct tevent_req *req, *subreq;
 309         struct nbt_getdc_state *state;
 310         uint16_t dgm_id;
 311
 312         req = tevent_req_create(mem_ctx, &state, struct nbt_getdc_state);
 313         if (req == NULL) {
 314                 return NULL;
 315         }
 316         state->ev = ev;
 317         state->msg_ctx = msg_ctx;
 318         state->dc_addr = dc_addr;
 319         state->domain_name = domain_name;
 320         state->sid = sid;
 321         state->nt_version = nt_version;
 322
 323         if (dc_addr->ss_family != AF_INET) {
 324                 tevent_req_nterror(req, NT_STATUS_NOT_SUPPORTED);
 325                 return tevent_req_post(req, ev);
 326         }
 327         state->my_mailslot = mailslot_name(
 328                 state, ((const struct sockaddr_in *)dc_addr)->sin_addr);
 329         if (tevent_req_nomem(state->my_mailslot, req)) {
 330                 return tevent_req_post(req, ev);
 331         }
 332         state->nmbd_pid = pidfile_pid(lp_pid_directory(), "nmbd");
 333         if (state->nmbd_pid == 0) {
 334                 DEBUG(3, ("No nmbd found\n"));
 335                 tevent_req_nterror(req, NT_STATUS_NOT_SUPPORTED);
 336                 return tevent_req_post(req, ev);
 337         }
 338
 339         generate_random_buffer((uint8_t *)(void *)&dgm_id, sizeof(dgm_id));
 340
 341         if (!prep_getdc_request(dc_addr, domain_name, sid, nt_version,
 342                                 state->my_mailslot, dgm_id & 0x7fff,
 343                                 &state->p)) {
 344                 DEBUG(3, ("prep_getdc_request failed\n"));
 345                 tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER);
 346                 return tevent_req_post(req, ev);
 347         }
 348
 349         subreq = nb_packet_reader_send(state, ev, DGRAM_PACKET, -1,
 350                                        state->my_mailslot);
 351         if (tevent_req_nomem(subreq, req)) {
 352                 return tevent_req_post(req, ev);
 353         }
 354         tevent_req_set_callback(subreq, nbt_getdc_got_reader, req);
 355         return req;
 356 }
 357
 358 static void nbt_getdc_got_reader(struct tevent_req *subreq)
 359 {
 360         struct tevent_req *req = tevent_req_callback_data(
 361                 subreq, struct tevent_req);
 362         struct nbt_getdc_state *state = tevent_req_data(
 363                 req, struct nbt_getdc_state);
 364         NTSTATUS status;
 365
 366         status = nb_packet_reader_recv(subreq, state, &state->reader);
 367         TALLOC_FREE(subreq);
 368         if (tevent_req_nterror(req, status)) {
 369                 DEBUG(10, ("nb_packet_reader_recv returned %s\n",
 370                            nt_errstr(status)));
 371                 return;
 372         }
 373
 374         status = messaging_send_buf(
 375                 state->msg_ctx, pid_to_procid(state->nmbd_pid),
 376                 MSG_SEND_PACKET, (uint8_t *)&state->p, sizeof(state->p));
 377
 378         if (tevent_req_nterror(req, status)) {
 379                 DEBUG(10, ("messaging_send_buf returned %s\n",
 380                            nt_errstr(status)));
 381                 return;
 382         }
 383         subreq = nb_packet_read_send(state, state->ev, state->reader);
 384         if (tevent_req_nomem(subreq, req)) {
 385                 return;
 386         }
 387         tevent_req_set_callback(subreq, nbt_getdc_got_response, req);
 388 }
 389
 390 static void nbt_getdc_got_response(struct tevent_req *subreq)
 391 {
 392         struct tevent_req *req = tevent_req_callback_data(
 393                 subreq, struct tevent_req);
 394         struct nbt_getdc_state *state = tevent_req_data(
 395                 req, struct nbt_getdc_state);
 396         struct packet_struct *p;
 397         NTSTATUS status;
 398         bool ret;
 399
 400         status = nb_packet_read_recv(subreq, &p);
 401         TALLOC_FREE(subreq);
 402         if (tevent_req_nterror(req, status)) {
 403                 return;
 404         }
 405
 406         ret = parse_getdc_response(p, state, state->domain_name,
 407                                    &state->nt_version, &state->dc_name,
 408                                    &state->samlogon_response);
 409         free_packet(p);
 410         if (!ret) {
 411                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
 412                 return;
 413         }
 414         tevent_req_done(req);
 415 }
 416
 417 NTSTATUS nbt_getdc_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
 418                         uint32_t *nt_version, const char **dc_name,
 419                         struct netlogon_samlogon_response **samlogon_response)
 420 {
 421         struct nbt_getdc_state *state = tevent_req_data(
 422                 req, struct nbt_getdc_state);
 423         NTSTATUS status;
 424
 425         if (tevent_req_is_nterror(req, &status)) {
 426                 return status;
 427         }
 428         if (nt_version != NULL) {
 429                 *nt_version = state->nt_version;
 430         }
 431         if (dc_name != NULL) {
 432                 *dc_name = talloc_move(mem_ctx, &state->dc_name);
 433         }
 434         if (samlogon_response != NULL) {
 435                 *samlogon_response = talloc_move(
 436                         mem_ctx, &state->samlogon_response);
 437         }
 438         return NT_STATUS_OK;
 439 }
 440
 441 NTSTATUS nbt_getdc(struct messaging_context *msg_ctx,
 442                    uint32_t timeout_in_seconds,
 443                    const struct sockaddr_storage *dc_addr,
 444                    const char *domain_name,
 445                    const struct dom_sid *sid,
 446                    uint32_t nt_version,
 447                    TALLOC_CTX *mem_ctx,
 448                    uint32_t *pnt_version,
 449                    const char **dc_name,
 450                    struct netlogon_samlogon_response **samlogon_response)
 451 {
 452         TALLOC_CTX *frame = talloc_stackframe();
 453         struct tevent_context *ev;
 454         struct tevent_req *req;
 455         NTSTATUS status = NT_STATUS_NO_MEMORY;
 456
 457         ev = samba_tevent_context_init(frame);
 458         if (ev == NULL) {
 459                 goto fail;
 460         }
 461         req = nbt_getdc_send(ev, ev, msg_ctx, dc_addr, domain_name,
 462                              sid, nt_version);
 463         if (req == NULL) {
 464                 goto fail;
 465         }
 466         if (!tevent_req_set_endtime(req, ev,
 467                         timeval_current_ofs(timeout_in_seconds, 0))) {
 468                 goto fail;
 469         }
 470         if (!tevent_req_poll_ntstatus(req, ev, &status)) {
 471                 goto fail;
 472         }
 473         status = nbt_getdc_recv(req, mem_ctx, pnt_version, dc_name,
 474                                 samlogon_response);
 475  fail:
 476         TALLOC_FREE(frame);
 477         return status;
 478 }