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