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 "messages.h"
  28 #include "librpc/gen_ndr/samr.h"
  29 #include "../lib/util/pidfile.h"
  30
  31 /*
  32  * cli_send_mailslot, send a mailslot for client code ...
  33  */
  34
  35 static bool cli_prep_mailslot(bool unique, const char *mailslot,
  36                        uint16 priority,
  37                        char *buf, int len,
  38                        const char *srcname, int src_type,
  39                        const char *dstname, int dest_type,
  40                        const struct sockaddr_storage *dest_ss,
  41                        int dgm_id,
  42                        struct packet_struct *p)
  43 {
  44         struct dgram_packet *dgram = &p->packet.dgram;
  45         char *ptr, *p2;
  46         char tmp[4];
  47         char addr[INET6_ADDRSTRLEN];
  48
  49         ZERO_STRUCTP(p);
  50
  51         /*
  52          * Next, build the DGRAM ...
  53          */
  54
  55         /* DIRECT GROUP or UNIQUE datagram. */
  56         dgram->header.msg_type = unique ? 0x10 : 0x11;
  57         dgram->header.flags.node_type = M_NODE;
  58         dgram->header.flags.first = True;
  59         dgram->header.flags.more = False;
  60         dgram->header.dgm_id = dgm_id;
  61         /* source ip is filled by nmbd */
  62         dgram->header.dgm_length = 0; /* Let build_dgram() handle this. */
  63         dgram->header.packet_offset = 0;
  64
  65         make_nmb_name(&dgram->source_name,srcname,src_type);
  66         make_nmb_name(&dgram->dest_name,dstname,dest_type);
  67
  68         ptr = &dgram->data[0];
  69
  70         /* Setup the smb part. */
  71         ptr -= 4; /* XXX Ugliness because of handling of tcp SMB length. */
  72         memcpy(tmp,ptr,4);
  73
  74         if (smb_size + 17*2 + strlen(mailslot) + 1 + len > MAX_DGRAM_SIZE) {
  75                 DEBUG(0, ("cli_send_mailslot: Cannot write beyond end of packet\n"));
  76                 return False;
  77         }
  78
  79         cli_set_message(ptr,17,strlen(mailslot) + 1 + len,True);
  80         memcpy(ptr,tmp,4);
  81
  82         SCVAL(ptr,smb_com,SMBtrans);
  83         SSVAL(ptr,smb_vwv1,len);
  84         SSVAL(ptr,smb_vwv11,len);
  85         SSVAL(ptr,smb_vwv12,70 + strlen(mailslot));
  86         SSVAL(ptr,smb_vwv13,3);
  87         SSVAL(ptr,smb_vwv14,1);
  88         SSVAL(ptr,smb_vwv15,priority);
  89         SSVAL(ptr,smb_vwv16,2);
  90         p2 = smb_buf(ptr);
  91         fstrcpy(p2,mailslot);
  92         p2 = skip_string(ptr,MAX_DGRAM_SIZE,p2);
  93         if (!p2) {
  94                 return False;
  95         }
  96
  97         memcpy(p2,buf,len);
  98         p2 += len;
  99
 100         dgram->datasize = PTR_DIFF(p2,ptr+4); /* +4 for tcp length. */
 101
 102         p->packet_type = DGRAM_PACKET;
 103         p->ip = ((const struct sockaddr_in *)dest_ss)->sin_addr;
 104         p->timestamp = time(NULL);
 105
 106         DEBUG(4,("send_mailslot: Sending to mailslot %s from %s ",
 107                  mailslot, nmb_namestr(&dgram->source_name)));
 108         print_sockaddr(addr, sizeof(addr), dest_ss);
 109
 110         DEBUGADD(4,("to %s IP %s\n", nmb_namestr(&dgram->dest_name), addr));
 111
 112         return true;
 113 }
 114
 115 static char *mailslot_name(TALLOC_CTX *mem_ctx, struct in_addr dc_ip)
 116 {
 117         return talloc_asprintf(mem_ctx, "%s%X",
 118                                NBT_MAILSLOT_GETDC, dc_ip.s_addr);
 119 }
 120
 121 static bool prep_getdc_request(const struct sockaddr_storage *dc_ss,
 122                                const char *domain_name,
 123                                const struct dom_sid *sid,
 124                                uint32_t nt_version,
 125                                const char *my_mailslot,
 126                                int dgm_id,
 127                                struct packet_struct *p)
 128 {
 129         TALLOC_CTX *frame = talloc_stackframe();
 130         const char *my_acct_name;
 131         struct nbt_netlogon_packet packet;
 132         struct NETLOGON_SAM_LOGON_REQUEST *s;
 133         enum ndr_err_code ndr_err;
 134         DATA_BLOB blob = data_blob_null;
 135         struct dom_sid my_sid;
 136         bool ret = false;
 137
 138         ZERO_STRUCT(packet);
 139         ZERO_STRUCT(my_sid);
 140
 141         if (sid != NULL) {
 142                 my_sid = *sid;
 143         }
 144
 145         my_acct_name = talloc_asprintf(talloc_tos(), "%s$", lp_netbios_name());
 146         if (my_acct_name == NULL) {
 147                 goto fail;
 148         }
 149
 150         packet.command  = LOGON_SAM_LOGON_REQUEST;
 151         s               = &packet.req.logon;
 152
 153         s->request_count        = 0;
 154         s->computer_name        = lp_netbios_name();
 155         s->user_name            = my_acct_name;
 156         s->mailslot_name        = my_mailslot;
 157         s->acct_control         = ACB_WSTRUST;
 158         s->sid                  = my_sid;
 159         s->nt_version           = nt_version;
 160         s->lmnt_token           = 0xffff;
 161         s->lm20_token           = 0xffff;
 162
 163         if (DEBUGLEVEL >= 10) {
 164                 NDR_PRINT_DEBUG(nbt_netlogon_packet, &packet);
 165         }
 166
 167         ndr_err = ndr_push_struct_blob(&blob, talloc_tos(), &packet,
 168                        (ndr_push_flags_fn_t)ndr_push_nbt_netlogon_packet);
 169         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 170                 goto fail;
 171         }
 172
 173         ret = cli_prep_mailslot(false, NBT_MAILSLOT_NTLOGON, 0,
 174                                 (char *)blob.data, blob.length,
 175                                 lp_netbios_name(), 0, domain_name, 0x1c,
 176                                 dc_ss, dgm_id, p);
 177 fail:
 178         TALLOC_FREE(frame);
 179         return ret;
 180 }
 181
 182 static bool parse_getdc_response(
 183         struct packet_struct *packet,
 184         TALLOC_CTX *mem_ctx,
 185         const char *domain_name,
 186         uint32_t *nt_version,
 187         const char **dc_name,
 188         struct netlogon_samlogon_response **samlogon_response)
 189 {
 190         DATA_BLOB blob;
 191         struct netlogon_samlogon_response *r;
 192         union dgram_message_body p;
 193         enum ndr_err_code ndr_err;
 194         NTSTATUS status;
 195
 196         const char *returned_dc = NULL;
 197         const char *returned_domain = NULL;
 198
 199         blob = data_blob_const(packet->packet.dgram.data,
 200                                packet->packet.dgram.datasize);
 201         if (blob.length < 4) {
 202                 DEBUG(1, ("invalid length: %d\n", (int)blob.length));
 203                 return false;
 204         }
 205
 206         if (RIVAL(blob.data,0) != DGRAM_SMB) {
 207                 DEBUG(1, ("invalid packet\n"));
 208                 return false;
 209         }
 210
 211         blob.data += 4;
 212         blob.length -= 4;
 213
 214         ndr_err = ndr_pull_union_blob_all(&blob, mem_ctx, &p, DGRAM_SMB,
 215                        (ndr_pull_flags_fn_t)ndr_pull_dgram_smb_packet);
 216         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 217                 DEBUG(1, ("failed to parse packet\n"));
 218                 return false;
 219         }
 220
 221         if (p.smb.smb_command != SMB_TRANSACTION) {
 222                 DEBUG(1, ("invalid smb_command: %d\n", p.smb.smb_command));
 223                 return false;
 224         }
 225
 226         if (DEBUGLEVEL >= 10) {
 227                 NDR_PRINT_DEBUG(dgram_smb_packet, &p);
 228         }
 229
 230         blob = p.smb.body.trans.data;
 231
 232         r = talloc_zero(mem_ctx, struct netlogon_samlogon_response);
 233         if (!r) {
 234                 return false;
 235         }
 236
 237         status = pull_netlogon_samlogon_response(&blob, r, r);
 238         if (!NT_STATUS_IS_OK(status)) {
 239                 TALLOC_FREE(r);
 240                 return false;
 241         }
 242
 243         map_netlogon_samlogon_response(r);
 244
 245         /* do we still need this ? */
 246         *nt_version = r->ntver;
 247
 248         returned_domain = r->data.nt5_ex.domain_name;
 249         returned_dc = r->data.nt5_ex.pdc_name;
 250
 251         if (!strequal(returned_domain, domain_name)) {
 252                 DEBUG(3, ("GetDC: Expected domain %s, got %s\n",
 253                           domain_name, returned_domain));
 254                 TALLOC_FREE(r);
 255                 return false;
 256         }
 257
 258         if (*returned_dc == '\\') returned_dc += 1;
 259         if (*returned_dc == '\\') returned_dc += 1;
 260
 261         *dc_name = talloc_strdup(mem_ctx, returned_dc);
 262         if (!*dc_name) {
 263                 TALLOC_FREE(r);
 264                 return false;
 265         }
 266
 267         if (samlogon_response) {
 268                 *samlogon_response = r;
 269         } else {
 270                 TALLOC_FREE(r);
 271         }
 272
 273         DEBUG(10, ("GetDC gave name %s for domain %s\n",
 274                    *dc_name, returned_domain));
 275
 276         return True;
 277 }
 278
 279 struct nbt_getdc_state {
 280         struct tevent_context *ev;
 281         struct messaging_context *msg_ctx;
 282         struct nb_packet_reader *reader;
 283         const char *my_mailslot;
 284         pid_t nmbd_pid;
 285
 286         const struct sockaddr_storage *dc_addr;
 287         const char *domain_name;
 288         const struct dom_sid *sid;
 289         uint32_t nt_version;
 290         const char *dc_name;
 291         struct netlogon_samlogon_response *samlogon_response;
 292
 293         struct packet_struct p;
 294 };
 295
 296 static void nbt_getdc_got_reader(struct tevent_req *subreq);
 297 static void nbt_getdc_got_response(struct tevent_req *subreq);
 298
 299 struct tevent_req *nbt_getdc_send(TALLOC_CTX *mem_ctx,
 300                                   struct tevent_context *ev,
 301                                   struct messaging_context *msg_ctx,
 302                                   const struct sockaddr_storage *dc_addr,
 303                                   const char *domain_name,
 304                                   const struct dom_sid *sid,
 305                                   uint32_t nt_version)
 306 {
 307         struct tevent_req *req, *subreq;
 308         struct nbt_getdc_state *state;
 309         uint16_t dgm_id;
 310
 311         req = tevent_req_create(mem_ctx, &state, struct nbt_getdc_state);
 312         if (req == NULL) {
 313                 return NULL;
 314         }
 315         state->ev = ev;
 316         state->msg_ctx = msg_ctx;
 317         state->dc_addr = dc_addr;
 318         state->domain_name = domain_name;
 319         state->sid = sid;
 320         state->nt_version = nt_version;
 321
 322         if (dc_addr->ss_family != AF_INET) {
 323                 tevent_req_nterror(req, NT_STATUS_NOT_SUPPORTED);
 324                 return tevent_req_post(req, ev);
 325         }
 326         state->my_mailslot = mailslot_name(
 327                 state, ((const struct sockaddr_in *)dc_addr)->sin_addr);
 328         if (tevent_req_nomem(state->my_mailslot, req)) {
 329                 return tevent_req_post(req, ev);
 330         }
 331         state->nmbd_pid = pidfile_pid(lp_pid_directory(), "nmbd");
 332         if (state->nmbd_pid == 0) {
 333                 DEBUG(3, ("No nmbd found\n"));
 334                 tevent_req_nterror(req, NT_STATUS_NOT_SUPPORTED);
 335                 return tevent_req_post(req, ev);
 336         }
 337
 338         generate_random_buffer((uint8_t *)(void *)&dgm_id, sizeof(dgm_id));
 339
 340         if (!prep_getdc_request(dc_addr, domain_name, sid, nt_version,
 341                                 state->my_mailslot, dgm_id & 0x7fff,
 342                                 &state->p)) {
 343                 DEBUG(3, ("prep_getdc_request failed\n"));
 344                 tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER);
 345                 return tevent_req_post(req, ev);
 346         }
 347
 348         subreq = nb_packet_reader_send(state, ev, DGRAM_PACKET, -1,
 349                                        state->my_mailslot);
 350         if (tevent_req_nomem(subreq, req)) {
 351                 return tevent_req_post(req, ev);
 352         }
 353         tevent_req_set_callback(subreq, nbt_getdc_got_reader, req);
 354         return req;
 355 }
 356
 357 static void nbt_getdc_got_reader(struct tevent_req *subreq)
 358 {
 359         struct tevent_req *req = tevent_req_callback_data(
 360                 subreq, struct tevent_req);
 361         struct nbt_getdc_state *state = tevent_req_data(
 362                 req, struct nbt_getdc_state);
 363         NTSTATUS status;
 364
 365         status = nb_packet_reader_recv(subreq, state, &state->reader);
 366         TALLOC_FREE(subreq);
 367         if (tevent_req_nterror(req, status)) {
 368                 DEBUG(10, ("nb_packet_reader_recv returned %s\n",
 369                            nt_errstr(status)));
 370                 return;
 371         }
 372
 373         status = messaging_send_buf(
 374                 state->msg_ctx, pid_to_procid(state->nmbd_pid),
 375                 MSG_SEND_PACKET, (uint8_t *)&state->p, sizeof(state->p));
 376
 377         if (tevent_req_nterror(req, status)) {
 378                 DEBUG(10, ("messaging_send_buf returned %s\n",
 379                            nt_errstr(status)));
 380                 return;
 381         }
 382         subreq = nb_packet_read_send(state, state->ev, state->reader);
 383         if (tevent_req_nomem(subreq, req)) {
 384                 return;
 385         }
 386         tevent_req_set_callback(subreq, nbt_getdc_got_response, req);
 387 }
 388
 389 static void nbt_getdc_got_response(struct tevent_req *subreq)
 390 {
 391         struct tevent_req *req = tevent_req_callback_data(
 392                 subreq, struct tevent_req);
 393         struct nbt_getdc_state *state = tevent_req_data(
 394                 req, struct nbt_getdc_state);
 395         struct packet_struct *p;
 396         NTSTATUS status;
 397         bool ret;
 398
 399         status = nb_packet_read_recv(subreq, &p);
 400         TALLOC_FREE(subreq);
 401         if (tevent_req_nterror(req, status)) {
 402                 return;
 403         }
 404
 405         ret = parse_getdc_response(p, state, state->domain_name,
 406                                    &state->nt_version, &state->dc_name,
 407                                    &state->samlogon_response);
 408         free_packet(p);
 409         if (!ret) {
 410                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
 411                 return;
 412         }
 413         tevent_req_done(req);
 414 }
 415
 416 NTSTATUS nbt_getdc_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
 417                         uint32_t *nt_version, const char **dc_name,
 418                         struct netlogon_samlogon_response **samlogon_response)
 419 {
 420         struct nbt_getdc_state *state = tevent_req_data(
 421                 req, struct nbt_getdc_state);
 422         NTSTATUS status;
 423
 424         if (tevent_req_is_nterror(req, &status)) {
 425                 return status;
 426         }
 427         if (nt_version != NULL) {
 428                 *nt_version = state->nt_version;
 429         }
 430         if (dc_name != NULL) {
 431                 *dc_name = talloc_move(mem_ctx, &state->dc_name);
 432         }
 433         if (samlogon_response != NULL) {
 434                 *samlogon_response = talloc_move(
 435                         mem_ctx, &state->samlogon_response);
 436         }
 437         return NT_STATUS_OK;
 438 }
 439
 440 NTSTATUS nbt_getdc(struct messaging_context *msg_ctx,
 441                    uint32_t timeout_in_seconds,
 442                    const struct sockaddr_storage *dc_addr,
 443                    const char *domain_name,
 444                    const struct dom_sid *sid,
 445                    uint32_t nt_version,
 446                    TALLOC_CTX *mem_ctx,
 447                    uint32_t *pnt_version,
 448                    const char **dc_name,
 449                    struct netlogon_samlogon_response **samlogon_response)
 450 {
 451         TALLOC_CTX *frame = talloc_stackframe();
 452         struct tevent_context *ev;
 453         struct tevent_req *req;
 454         NTSTATUS status = NT_STATUS_NO_MEMORY;
 455
 456         ev = samba_tevent_context_init(frame);
 457         if (ev == NULL) {
 458                 goto fail;
 459         }
 460         req = nbt_getdc_send(ev, ev, msg_ctx, dc_addr, domain_name,
 461                              sid, nt_version);
 462         if (req == NULL) {
 463                 goto fail;
 464         }
 465         if (!tevent_req_set_endtime(req, ev,
 466                         timeval_current_ofs(timeout_in_seconds, 0))) {
 467                 goto fail;
 468         }
 469         if (!tevent_req_poll_ntstatus(req, ev, &status)) {
 470                 goto fail;
 471         }
 472         status = nbt_getdc_recv(req, mem_ctx, pnt_version, dc_name,
 473                                 samlogon_response);
 474  fail:
 475         TALLOC_FREE(frame);
 476         return status;
 477 }