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