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 *account_name,
 124                                uint32_t account_flags,
 125                                const char *domain_name,
 126                                const struct dom_sid *sid,
 127                                uint32_t nt_version,
 128                                const char *my_mailslot,
 129                                int dgm_id,
 130                                struct packet_struct *p)
 131 {
 132         TALLOC_CTX *frame = talloc_stackframe();
 133         struct nbt_netlogon_packet packet;
 134         struct NETLOGON_SAM_LOGON_REQUEST *s;
 135         enum ndr_err_code ndr_err;
 136         DATA_BLOB blob = data_blob_null;
 137         struct dom_sid my_sid;
 138         bool ret = false;
 139
 140         ZERO_STRUCT(packet);
 141         ZERO_STRUCT(my_sid);
 142
 143         if (sid != NULL) {
 144                 my_sid = *sid;
 145         }
 146
 147         packet.command  = LOGON_SAM_LOGON_REQUEST;
 148         s               = &packet.req.logon;
 149
 150         s->request_count        = 0;
 151         s->computer_name        = lp_netbios_name();
 152         s->user_name            = account_name;
 153         s->mailslot_name        = my_mailslot;
 154         s->acct_control         = account_flags;
 155         s->sid                  = my_sid;
 156         s->nt_version           = nt_version;
 157         s->lmnt_token           = 0xffff;
 158         s->lm20_token           = 0xffff;
 159
 160         if (DEBUGLEVEL >= 10) {
 161                 NDR_PRINT_DEBUG(nbt_netlogon_packet, &packet);
 162         }
 163
 164         ndr_err = ndr_push_struct_blob(&blob, talloc_tos(), &packet,
 165                        (ndr_push_flags_fn_t)ndr_push_nbt_netlogon_packet);
 166         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 167                 goto fail;
 168         }
 169
 170         ret = cli_prep_mailslot(false, NBT_MAILSLOT_NTLOGON, 0,
 171                                 (char *)blob.data, blob.length,
 172                                 lp_netbios_name(), 0, domain_name, 0x1c,
 173                                 dc_ss, dgm_id, p);
 174 fail:
 175         TALLOC_FREE(frame);
 176         return ret;
 177 }
 178
 179 static bool parse_getdc_response(
 180         struct packet_struct *packet,
 181         TALLOC_CTX *mem_ctx,
 182         const char *domain_name,
 183         uint32_t *nt_version,
 184         const char **dc_name,
 185         struct netlogon_samlogon_response **samlogon_response)
 186 {
 187         DATA_BLOB blob;
 188         struct netlogon_samlogon_response *r;
 189         union dgram_message_body p;
 190         enum ndr_err_code ndr_err;
 191         NTSTATUS status;
 192
 193         const char *returned_dc = NULL;
 194         const char *returned_domain = NULL;
 195
 196         blob = data_blob_const(packet->packet.dgram.data,
 197                                packet->packet.dgram.datasize);
 198         if (blob.length < 4) {
 199                 DEBUG(1, ("invalid length: %d\n", (int)blob.length));
 200                 return false;
 201         }
 202
 203         if (RIVAL(blob.data,0) != DGRAM_SMB) {
 204                 DEBUG(1, ("invalid packet\n"));
 205                 return false;
 206         }
 207
 208         blob.data += 4;
 209         blob.length -= 4;
 210
 211         ndr_err = ndr_pull_union_blob_all(&blob, mem_ctx, &p, DGRAM_SMB,
 212                        (ndr_pull_flags_fn_t)ndr_pull_dgram_smb_packet);
 213         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 214                 DEBUG(1, ("failed to parse packet\n"));
 215                 return false;
 216         }
 217
 218         if (p.smb.smb_command != SMB_TRANSACTION) {
 219                 DEBUG(1, ("invalid smb_command: %d\n", p.smb.smb_command));
 220                 return false;
 221         }
 222
 223         if (DEBUGLEVEL >= 10) {
 224                 NDR_PRINT_DEBUG(dgram_smb_packet, &p);
 225         }
 226
 227         blob = p.smb.body.trans.data;
 228
 229         r = talloc_zero(mem_ctx, struct netlogon_samlogon_response);
 230         if (!r) {
 231                 return false;
 232         }
 233
 234         status = pull_netlogon_samlogon_response(&blob, r, r);
 235         if (!NT_STATUS_IS_OK(status)) {
 236                 TALLOC_FREE(r);
 237                 return false;
 238         }
 239
 240         map_netlogon_samlogon_response(r);
 241
 242         /* do we still need this ? */
 243         *nt_version = r->ntver;
 244
 245         returned_domain = r->data.nt5_ex.domain_name;
 246         returned_dc = r->data.nt5_ex.pdc_name;
 247
 248         if (!strequal(returned_domain, domain_name)) {
 249                 DEBUG(3, ("GetDC: Expected domain %s, got %s\n",
 250                           domain_name, returned_domain));
 251                 TALLOC_FREE(r);
 252                 return false;
 253         }
 254
 255         if (*returned_dc == '\\') returned_dc += 1;
 256         if (*returned_dc == '\\') returned_dc += 1;
 257
 258         *dc_name = talloc_strdup(mem_ctx, returned_dc);
 259         if (!*dc_name) {
 260                 TALLOC_FREE(r);
 261                 return false;
 262         }
 263
 264         if (samlogon_response) {
 265                 *samlogon_response = r;
 266         } else {
 267                 TALLOC_FREE(r);
 268         }
 269
 270         DEBUG(10, ("GetDC gave name %s for domain %s\n",
 271                    *dc_name, returned_domain));
 272
 273         return True;
 274 }
 275
 276 struct nbt_getdc_state {
 277         struct tevent_context *ev;
 278         struct messaging_context *msg_ctx;
 279         struct nb_packet_reader *reader;
 280         const char *my_mailslot;
 281         pid_t nmbd_pid;
 282
 283         const struct sockaddr_storage *dc_addr;
 284         const char *domain_name;
 285         const struct dom_sid *sid;
 286         uint32_t nt_version;
 287         const char *dc_name;
 288         struct netlogon_samlogon_response *samlogon_response;
 289
 290         struct packet_struct p;
 291 };
 292
 293 static void nbt_getdc_got_reader(struct tevent_req *subreq);
 294 static void nbt_getdc_got_response(struct tevent_req *subreq);
 295
 296 struct tevent_req *nbt_getdc_send(TALLOC_CTX *mem_ctx,
 297                                   struct tevent_context *ev,
 298                                   struct messaging_context *msg_ctx,
 299                                   const struct sockaddr_storage *dc_addr,
 300                                   const char *domain_name,
 301                                   const struct dom_sid *sid,
 302                                   const char *account_name,
 303                                   uint32_t account_flags,
 304                                   uint32_t nt_version)
 305 {
 306         struct tevent_req *req, *subreq;
 307         struct nbt_getdc_state *state;
 308         uint16_t dgm_id;
 309         bool ok;
 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         ok = prep_getdc_request(dc_addr, account_name, account_flags,
 341                                 domain_name, sid, nt_version,
 342                                 state->my_mailslot, dgm_id & 0x7fff,
 343                                 &state->p);
 344
 345         if (!ok) {
 346                 DEBUG(3, ("prep_getdc_request failed\n"));
 347                 tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER);
 348                 return tevent_req_post(req, ev);
 349         }
 350
 351         subreq = nb_packet_reader_send(state, ev, DGRAM_PACKET, -1,
 352                                        state->my_mailslot);
 353         if (tevent_req_nomem(subreq, req)) {
 354                 return tevent_req_post(req, ev);
 355         }
 356         tevent_req_set_callback(subreq, nbt_getdc_got_reader, req);
 357         return req;
 358 }
 359
 360 static void nbt_getdc_got_reader(struct tevent_req *subreq)
 361 {
 362         struct tevent_req *req = tevent_req_callback_data(
 363                 subreq, struct tevent_req);
 364         struct nbt_getdc_state *state = tevent_req_data(
 365                 req, struct nbt_getdc_state);
 366         NTSTATUS status;
 367
 368         status = nb_packet_reader_recv(subreq, state, &state->reader);
 369         TALLOC_FREE(subreq);
 370         if (tevent_req_nterror(req, status)) {
 371                 DEBUG(10, ("nb_packet_reader_recv returned %s\n",
 372                            nt_errstr(status)));
 373                 return;
 374         }
 375
 376         status = messaging_send_buf(
 377                 state->msg_ctx, pid_to_procid(state->nmbd_pid),
 378                 MSG_SEND_PACKET, (uint8_t *)&state->p, sizeof(state->p));
 379
 380         if (tevent_req_nterror(req, status)) {
 381                 DEBUG(10, ("messaging_send_buf returned %s\n",
 382                            nt_errstr(status)));
 383                 return;
 384         }
 385         subreq = nb_packet_read_send(state, state->ev, state->reader);
 386         if (tevent_req_nomem(subreq, req)) {
 387                 return;
 388         }
 389         tevent_req_set_callback(subreq, nbt_getdc_got_response, req);
 390 }
 391
 392 static void nbt_getdc_got_response(struct tevent_req *subreq)
 393 {
 394         struct tevent_req *req = tevent_req_callback_data(
 395                 subreq, struct tevent_req);
 396         struct nbt_getdc_state *state = tevent_req_data(
 397                 req, struct nbt_getdc_state);
 398         struct packet_struct *p;
 399         NTSTATUS status;
 400         bool ret;
 401
 402         status = nb_packet_read_recv(subreq, state, &p);
 403         TALLOC_FREE(subreq);
 404         if (tevent_req_nterror(req, status)) {
 405                 return;
 406         }
 407
 408         ret = parse_getdc_response(p, state, state->domain_name,
 409                                    &state->nt_version, &state->dc_name,
 410                                    &state->samlogon_response);
 411         if (!ret) {
 412                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
 413                 return;
 414         }
 415         tevent_req_done(req);
 416 }
 417
 418 NTSTATUS nbt_getdc_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
 419                         uint32_t *nt_version, const char **dc_name,
 420                         struct netlogon_samlogon_response **samlogon_response)
 421 {
 422         struct nbt_getdc_state *state = tevent_req_data(
 423                 req, struct nbt_getdc_state);
 424         NTSTATUS status;
 425
 426         if (tevent_req_is_nterror(req, &status)) {
 427                 return status;
 428         }
 429         if (nt_version != NULL) {
 430                 *nt_version = state->nt_version;
 431         }
 432         if (dc_name != NULL) {
 433                 *dc_name = talloc_move(mem_ctx, &state->dc_name);
 434         }
 435         if (samlogon_response != NULL) {
 436                 *samlogon_response = talloc_move(
 437                         mem_ctx, &state->samlogon_response);
 438         }
 439         return NT_STATUS_OK;
 440 }
 441
 442 NTSTATUS nbt_getdc(struct messaging_context *msg_ctx,
 443                    uint32_t timeout_in_seconds,
 444                    const struct sockaddr_storage *dc_addr,
 445                    const char *domain_name,
 446                    const struct dom_sid *sid,
 447                    const char *account_name,
 448                    uint32_t account_flags,
 449                    uint32_t nt_version,
 450                    TALLOC_CTX *mem_ctx,
 451                    uint32_t *pnt_version,
 452                    const char **dc_name,
 453                    struct netlogon_samlogon_response **samlogon_response)
 454 {
 455         TALLOC_CTX *frame = talloc_stackframe();
 456         struct tevent_context *ev;
 457         struct tevent_req *req;
 458         NTSTATUS status = NT_STATUS_NO_MEMORY;
 459
 460         ev = samba_tevent_context_init(frame);
 461         if (ev == NULL) {
 462                 goto fail;
 463         }
 464         req = nbt_getdc_send(ev, ev, msg_ctx, dc_addr, domain_name,
 465                              sid, account_name, account_flags, nt_version);
 466         if (req == NULL) {
 467                 goto fail;
 468         }
 469         if (!tevent_req_set_endtime(req, ev,
 470                         timeval_current_ofs(timeout_in_seconds, 0))) {
 471                 goto fail;
 472         }
 473         if (!tevent_req_poll_ntstatus(req, ev, &status)) {
 474                 goto fail;
 475         }
 476         status = nbt_getdc_recv(req, mem_ctx, pnt_version, dc_name,
 477                                 samlogon_response);
 478  fail:
 479         TALLOC_FREE(frame);
 480         return status;
 481 }