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 "librpc/gen_ndr/messaging.h"
  24 #include "libsmb/clidgram.h"
  25 #include "libsmb/nmblib.h"
  26
  27 /*
  28  * cli_send_mailslot, send a mailslot for client code ...
  29  */
  30
  31 static bool cli_prep_mailslot(bool unique, const char *mailslot,
  32                        uint16 priority,
  33                        char *buf, int len,
  34                        const char *srcname, int src_type,
  35                        const char *dstname, int dest_type,
  36                        const struct sockaddr_storage *dest_ss,
  37                        int dgm_id,
  38                        struct packet_struct *p)
  39 {
  40         struct dgram_packet *dgram = &p->packet.dgram;
  41         char *ptr, *p2;
  42         char tmp[4];
  43         char addr[INET6_ADDRSTRLEN];
  44
  45         ZERO_STRUCTP(p);
  46
  47         /*
  48          * Next, build the DGRAM ...
  49          */
  50
  51         /* DIRECT GROUP or UNIQUE datagram. */
  52         dgram->header.msg_type = unique ? 0x10 : 0x11;
  53         dgram->header.flags.node_type = M_NODE;
  54         dgram->header.flags.first = True;
  55         dgram->header.flags.more = False;
  56         dgram->header.dgm_id = dgm_id;
  57         /* source ip is filled by nmbd */
  58         dgram->header.dgm_length = 0; /* Let build_dgram() handle this. */
  59         dgram->header.packet_offset = 0;
  60
  61         make_nmb_name(&dgram->source_name,srcname,src_type);
  62         make_nmb_name(&dgram->dest_name,dstname,dest_type);
  63
  64         ptr = &dgram->data[0];
  65
  66         /* Setup the smb part. */
  67         ptr -= 4; /* XXX Ugliness because of handling of tcp SMB length. */
  68         memcpy(tmp,ptr,4);
  69
  70         if (smb_size + 17*2 + strlen(mailslot) + 1 + len > MAX_DGRAM_SIZE) {
  71                 DEBUG(0, ("cli_send_mailslot: Cannot write beyond end of packet\n"));
  72                 return False;
  73         }
  74
  75         cli_set_message(ptr,17,strlen(mailslot) + 1 + len,True);
  76         memcpy(ptr,tmp,4);
  77
  78         SCVAL(ptr,smb_com,SMBtrans);
  79         SSVAL(ptr,smb_vwv1,len);
  80         SSVAL(ptr,smb_vwv11,len);
  81         SSVAL(ptr,smb_vwv12,70 + strlen(mailslot));
  82         SSVAL(ptr,smb_vwv13,3);
  83         SSVAL(ptr,smb_vwv14,1);
  84         SSVAL(ptr,smb_vwv15,priority);
  85         SSVAL(ptr,smb_vwv16,2);
  86         p2 = smb_buf(ptr);
  87         fstrcpy(p2,mailslot);
  88         p2 = skip_string(ptr,MAX_DGRAM_SIZE,p2);
  89         if (!p2) {
  90                 return False;
  91         }
  92
  93         memcpy(p2,buf,len);
  94         p2 += len;
  95
  96         dgram->datasize = PTR_DIFF(p2,ptr+4); /* +4 for tcp length. */
  97
  98         p->packet_type = DGRAM_PACKET;
  99         p->ip = ((const struct sockaddr_in *)dest_ss)->sin_addr;
 100         p->timestamp = time(NULL);
 101
 102         DEBUG(4,("send_mailslot: Sending to mailslot %s from %s ",
 103                  mailslot, nmb_namestr(&dgram->source_name)));
 104         print_sockaddr(addr, sizeof(addr), dest_ss);
 105
 106         DEBUGADD(4,("to %s IP %s\n", nmb_namestr(&dgram->dest_name), addr));
 107
 108         return true;
 109 }
 110
 111 static char *mailslot_name(TALLOC_CTX *mem_ctx, struct in_addr dc_ip)
 112 {
 113         return talloc_asprintf(mem_ctx, "%s%X",
 114                                NBT_MAILSLOT_GETDC, dc_ip.s_addr);
 115 }
 116
 117 static bool prep_getdc_request(const struct sockaddr_storage *dc_ss,
 118                                const char *domain_name,
 119                                const struct dom_sid *sid,
 120                                uint32_t nt_version,
 121                                const char *my_mailslot,
 122                                int dgm_id,
 123                                struct packet_struct *p)
 124 {
 125         TALLOC_CTX *frame = talloc_stackframe();
 126         const char *my_acct_name;
 127         struct nbt_netlogon_packet packet;
 128         struct NETLOGON_SAM_LOGON_REQUEST *s;
 129         enum ndr_err_code ndr_err;
 130         DATA_BLOB blob = data_blob_null;
 131         struct dom_sid my_sid;
 132         bool ret = false;
 133
 134         ZERO_STRUCT(packet);
 135         ZERO_STRUCT(my_sid);
 136
 137         if (sid != NULL) {
 138                 my_sid = *sid;
 139         }
 140
 141         my_acct_name = talloc_asprintf(talloc_tos(), "%s$", global_myname());
 142         if (my_acct_name == NULL) {
 143                 goto fail;
 144         }
 145
 146         packet.command  = LOGON_SAM_LOGON_REQUEST;
 147         s               = &packet.req.logon;
 148
 149         s->request_count        = 0;
 150         s->computer_name        = global_myname();
 151         s->user_name            = my_acct_name;
 152         s->mailslot_name        = my_mailslot;
 153         s->acct_control         = ACB_WSTRUST;
 154         s->sid                  = my_sid;
 155         s->nt_version           = nt_version;
 156         s->lmnt_token           = 0xffff;
 157         s->lm20_token           = 0xffff;
 158
 159         if (DEBUGLEVEL >= 10) {
 160                 NDR_PRINT_DEBUG(nbt_netlogon_packet, &packet);
 161         }
 162
 163         ndr_err = ndr_push_struct_blob(&blob, talloc_tos(), &packet,
 164                        (ndr_push_flags_fn_t)ndr_push_nbt_netlogon_packet);
 165         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 166                 goto fail;
 167         }
 168
 169         ret = cli_prep_mailslot(false, NBT_MAILSLOT_NTLOGON, 0,
 170                                 (char *)blob.data, blob.length,
 171                                 global_myname(), 0, domain_name, 0x1c,
 172                                 dc_ss, dgm_id, p);
 173 fail:
 174         TALLOC_FREE(frame);
 175         return ret;
 176 }
 177
 178 static bool parse_getdc_response(
 179         struct packet_struct *packet,
 180         TALLOC_CTX *mem_ctx,
 181         const char *domain_name,
 182         uint32_t *nt_version,
 183         const char **dc_name,
 184         struct netlogon_samlogon_response **samlogon_response)
 185 {
 186         DATA_BLOB blob;
 187         struct netlogon_samlogon_response *r;
 188         union dgram_message_body p;
 189         enum ndr_err_code ndr_err;
 190         NTSTATUS status;
 191
 192         const char *returned_dc = NULL;
 193         const char *returned_domain = NULL;
 194
 195         blob = data_blob_const(packet->packet.dgram.data,
 196                                packet->packet.dgram.datasize);
 197         if (blob.length < 4) {
 198                 DEBUG(1, ("invalid length: %d\n", (int)blob.length));
 199                 return false;
 200         }
 201
 202         if (RIVAL(blob.data,0) != DGRAM_SMB) {
 203                 DEBUG(1, ("invalid packet\n"));
 204                 return false;
 205         }
 206
 207         blob.data += 4;
 208         blob.length -= 4;
 209
 210         ndr_err = ndr_pull_union_blob_all(&blob, mem_ctx, &p, DGRAM_SMB,
 211                        (ndr_pull_flags_fn_t)ndr_pull_dgram_smb_packet);
 212         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 213                 DEBUG(1, ("failed to parse packet\n"));
 214                 return false;
 215         }
 216
 217         if (p.smb.smb_command != SMB_TRANSACTION) {
 218                 DEBUG(1, ("invalid smb_command: %d\n", p.smb.smb_command));
 219                 return false;
 220         }
 221
 222         if (DEBUGLEVEL >= 10) {
 223                 NDR_PRINT_DEBUG(dgram_smb_packet, &p);
 224         }
 225
 226         blob = p.smb.body.trans.data;
 227
 228         r = TALLOC_ZERO_P(mem_ctx, struct netlogon_samlogon_response);
 229         if (!r) {
 230                 return false;
 231         }
 232
 233         status = pull_netlogon_samlogon_response(&blob, r, r);
 234         if (!NT_STATUS_IS_OK(status)) {
 235                 TALLOC_FREE(r);
 236                 return false;
 237         }
 238
 239         map_netlogon_samlogon_response(r);
 240
 241         /* do we still need this ? */
 242         *nt_version = r->ntver;
 243
 244         returned_domain = r->data.nt5_ex.domain_name;
 245         returned_dc = r->data.nt5_ex.pdc_name;
 246
 247         if (!strequal(returned_domain, domain_name)) {
 248                 DEBUG(3, ("GetDC: Expected domain %s, got %s\n",
 249                           domain_name, returned_domain));
 250                 TALLOC_FREE(r);
 251                 return false;
 252         }
 253
 254         if (*returned_dc == '\\') returned_dc += 1;
 255         if (*returned_dc == '\\') returned_dc += 1;
 256
 257         *dc_name = talloc_strdup(mem_ctx, returned_dc);
 258         if (!*dc_name) {
 259                 TALLOC_FREE(r);
 260                 return false;
 261         }
 262
 263         if (samlogon_response) {
 264                 *samlogon_response = r;
 265         } else {
 266                 TALLOC_FREE(r);
 267         }
 268
 269         DEBUG(10, ("GetDC gave name %s for domain %s\n",
 270                    *dc_name, returned_domain));
 271
 272         return True;
 273 }
 274
 275 struct nbt_getdc_state {
 276         struct tevent_context *ev;
 277         struct messaging_context *msg_ctx;
 278         struct nb_packet_reader *reader;
 279         const char *my_mailslot;
 280         pid_t nmbd_pid;
 281
 282         const struct sockaddr_storage *dc_addr;
 283         const char *domain_name;
 284         const struct dom_sid *sid;
 285         uint32_t nt_version;
 286         const char *dc_name;
 287         struct netlogon_samlogon_response *samlogon_response;
 288
 289         struct packet_struct p;
 290 };
 291
 292 static void nbt_getdc_got_reader(struct tevent_req *subreq);
 293 static void nbt_getdc_got_response(struct tevent_req *subreq);
 294
 295 struct tevent_req *nbt_getdc_send(TALLOC_CTX *mem_ctx,
 296                                   struct tevent_context *ev,
 297                                   struct messaging_context *msg_ctx,
 298                                   const struct sockaddr_storage *dc_addr,
 299                                   const char *domain_name,
 300                                   const struct dom_sid *sid,
 301                                   uint32_t nt_version)
 302 {
 303         struct tevent_req *req, *subreq;
 304         struct nbt_getdc_state *state;
 305         uint16_t dgm_id;
 306
 307         req = tevent_req_create(mem_ctx, &state, struct nbt_getdc_state);
 308         if (req == NULL) {
 309                 return NULL;
 310         }
 311         state->ev = ev;
 312         state->msg_ctx = msg_ctx;
 313         state->dc_addr = dc_addr;
 314         state->domain_name = domain_name;
 315         state->sid = sid;
 316         state->nt_version = nt_version;
 317
 318         if (dc_addr->ss_family != AF_INET) {
 319                 tevent_req_nterror(req, NT_STATUS_NOT_SUPPORTED);
 320                 return tevent_req_post(req, ev);
 321         }
 322         state->my_mailslot = mailslot_name(
 323                 state, ((struct sockaddr_in *)dc_addr)->sin_addr);
 324         if (tevent_req_nomem(state->my_mailslot, req)) {
 325                 return tevent_req_post(req, ev);
 326         }
 327         state->nmbd_pid = pidfile_pid("nmbd");
 328         if (state->nmbd_pid == 0) {
 329                 DEBUG(3, ("No nmbd found\n"));
 330                 tevent_req_nterror(req, NT_STATUS_NOT_SUPPORTED);
 331                 return tevent_req_post(req, ev);
 332         }
 333
 334         generate_random_buffer((uint8_t *)(void *)&dgm_id, sizeof(dgm_id));
 335
 336         if (!prep_getdc_request(dc_addr, domain_name, sid, nt_version,
 337                                 state->my_mailslot, dgm_id & 0x7fff,
 338                                 &state->p)) {
 339                 DEBUG(3, ("prep_getdc_request failed\n"));
 340                 tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER);
 341                 return tevent_req_post(req, ev);
 342         }
 343
 344         subreq = nb_packet_reader_send(state, ev, DGRAM_PACKET, -1,
 345                                        state->my_mailslot);
 346         if (tevent_req_nomem(subreq, req)) {
 347                 return tevent_req_post(req, ev);
 348         }
 349         tevent_req_set_callback(subreq, nbt_getdc_got_reader, req);
 350         return req;
 351 }
 352
 353 static void nbt_getdc_got_reader(struct tevent_req *subreq)
 354 {
 355         struct tevent_req *req = tevent_req_callback_data(
 356                 subreq, struct tevent_req);
 357         struct nbt_getdc_state *state = tevent_req_data(
 358                 req, struct nbt_getdc_state);
 359         NTSTATUS status;
 360
 361         status = nb_packet_reader_recv(subreq, state, &state->reader);
 362         TALLOC_FREE(subreq);
 363         if (tevent_req_nterror(req, status)) {
 364                 DEBUG(10, ("nb_packet_reader_recv returned %s\n",
 365                            nt_errstr(status)));
 366                 return;
 367         }
 368
 369         status = messaging_send_buf(
 370                 state->msg_ctx, pid_to_procid(state->nmbd_pid),
 371                 MSG_SEND_PACKET, (uint8_t *)&state->p, sizeof(state->p));
 372
 373         if (tevent_req_nterror(req, status)) {
 374                 DEBUG(10, ("messaging_send_buf returned %s\n",
 375                            nt_errstr(status)));
 376                 return;
 377         }
 378         subreq = nb_packet_read_send(state, state->ev, state->reader);
 379         if (tevent_req_nomem(subreq, req)) {
 380                 return;
 381         }
 382         tevent_req_set_callback(subreq, nbt_getdc_got_response, req);
 383 }
 384
 385 static void nbt_getdc_got_response(struct tevent_req *subreq)
 386 {
 387         struct tevent_req *req = tevent_req_callback_data(
 388                 subreq, struct tevent_req);
 389         struct nbt_getdc_state *state = tevent_req_data(
 390                 req, struct nbt_getdc_state);
 391         struct packet_struct *p;
 392         NTSTATUS status;
 393         bool ret;
 394
 395         status = nb_packet_read_recv(subreq, &p);
 396         TALLOC_FREE(subreq);
 397         if (tevent_req_nterror(req, status)) {
 398                 return;
 399         }
 400
 401         ret = parse_getdc_response(p, state, state->domain_name,
 402                                    &state->nt_version, &state->dc_name,
 403                                    &state->samlogon_response);
 404         free_packet(p);
 405         if (!ret) {
 406                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
 407                 return;
 408         }
 409         tevent_req_done(req);
 410 }
 411
 412 NTSTATUS nbt_getdc_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
 413                         uint32_t *nt_version, const char **dc_name,
 414                         struct netlogon_samlogon_response **samlogon_response)
 415 {
 416         struct nbt_getdc_state *state = tevent_req_data(
 417                 req, struct nbt_getdc_state);
 418         NTSTATUS status;
 419
 420         if (tevent_req_is_nterror(req, &status)) {
 421                 return status;
 422         }
 423         if (nt_version != NULL) {
 424                 *nt_version = state->nt_version;
 425         }
 426         if (dc_name != NULL) {
 427                 *dc_name = talloc_move(mem_ctx, &state->dc_name);
 428         }
 429         if (samlogon_response != NULL) {
 430                 *samlogon_response = talloc_move(
 431                         mem_ctx, &state->samlogon_response);
 432         }
 433         return NT_STATUS_OK;
 434 }
 435
 436 NTSTATUS nbt_getdc(struct messaging_context *msg_ctx,
 437                    const struct sockaddr_storage *dc_addr,
 438                    const char *domain_name,
 439                    const struct dom_sid *sid,
 440                    uint32_t nt_version,
 441                    TALLOC_CTX *mem_ctx,
 442                    uint32_t *pnt_version,
 443                    const char **dc_name,
 444                    struct netlogon_samlogon_response **samlogon_response)
 445 {
 446         TALLOC_CTX *frame = talloc_stackframe();
 447         struct tevent_context *ev;
 448         struct tevent_req *req;
 449         NTSTATUS status = NT_STATUS_NO_MEMORY;
 450
 451         ev = tevent_context_init(frame);
 452         if (ev == NULL) {
 453                 goto fail;
 454         }
 455         req = nbt_getdc_send(ev, ev, msg_ctx, dc_addr, domain_name,
 456                              sid, nt_version);
 457         if (req == NULL) {
 458                 goto fail;
 459         }
 460         if (!tevent_req_poll_ntstatus(req, ev, &status)) {
 461                 goto fail;
 462         }
 463         status = nbt_getdc_recv(req, mem_ctx, pnt_version, dc_name,
 464                                 samlogon_response);
 465  fail:
 466         TALLOC_FREE(frame);
 467         return status;
 468 }