source4/librpc/rpc/dcerpc_smb.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    dcerpc over SMB transport
   5
   6    Copyright (C) Tim Potter 2003
   7    Copyright (C) Andrew Tridgell 2003
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21 */
  22
  23 #include "includes.h"
  24 #include "libcli/raw/libcliraw.h"
  25 #include "libcli/composite/composite.h"
  26 #include "librpc/rpc/dcerpc.h"
  27 #include "librpc/rpc/dcerpc_proto.h"
  28
  29 /* transport private information used by SMB pipe transport */
  30 struct smb_private {
  31         uint16_t fnum;
  32         struct smbcli_tree *tree;
  33         const char *server_name;
  34         bool dead;
  35 };
  36
  37
  38 /*
  39   tell the dcerpc layer that the transport is dead
  40 */
  41 static void pipe_dead(struct dcerpc_connection *c, NTSTATUS status)
  42 {
  43         struct smb_private *smb = (struct smb_private *)c->transport.private_data;
  44
  45         if (smb->dead) {
  46                 return;
  47         }
  48
  49         smb->dead = true;
  50
  51         if (NT_STATUS_EQUAL(NT_STATUS_UNSUCCESSFUL, status)) {
  52                 status = NT_STATUS_UNEXPECTED_NETWORK_ERROR;
  53         }
  54
  55         if (NT_STATUS_EQUAL(NT_STATUS_OK, status)) {
  56                 status = NT_STATUS_END_OF_FILE;
  57         }
  58
  59         if (c->transport.recv_data) {
  60                 c->transport.recv_data(c, NULL, status);
  61         }
  62 }
  63
  64
  65 /*
  66    this holds the state of an in-flight call
  67 */
  68 struct smb_read_state {
  69         struct dcerpc_connection *c;
  70         struct smbcli_request *req;
  71         size_t received;
  72         DATA_BLOB data;
  73         union smb_read *io;
  74 };
  75
  76 /*
  77   called when a read request has completed
  78 */
  79 static void smb_read_callback(struct smbcli_request *req)
  80 {
  81         struct smb_private *smb;
  82         struct smb_read_state *state;
  83         union smb_read *io;
  84         uint16_t frag_length;
  85         NTSTATUS status;
  86
  87         state = talloc_get_type(req->async.private, struct smb_read_state);
  88         smb = talloc_get_type(state->c->transport.private_data, struct smb_private);
  89         io = state->io;
  90
  91         status = smb_raw_read_recv(state->req, io);
  92         if (NT_STATUS_IS_ERR(status)) {
  93                 pipe_dead(state->c, status);
  94                 talloc_free(state);
  95                 return;
  96         }
  97
  98         state->received += io->readx.out.nread;
  99
 100         if (state->received < 16) {
 101                 DEBUG(0,("dcerpc_smb: short packet (length %d) in read callback!\n",
 102                          (int)state->received));
 103                 pipe_dead(state->c, NT_STATUS_INFO_LENGTH_MISMATCH);
 104                 talloc_free(state);
 105                 return;
 106         }
 107
 108         frag_length = dcerpc_get_frag_length(&state->data);
 109
 110         if (frag_length <= state->received) {
 111                 DATA_BLOB data = state->data;
 112                 struct dcerpc_connection *c = state->c;
 113                 data.length = state->received;
 114                 talloc_steal(state->c, data.data);
 115                 talloc_free(state);
 116                 c->transport.recv_data(c, &data, NT_STATUS_OK);
 117                 return;
 118         }
 119
 120         /* initiate another read request, as we only got part of a fragment */
 121         state->data.data = talloc_realloc(state, state->data.data, uint8_t, frag_length);
 122
 123         io->readx.in.mincnt = MIN(state->c->srv_max_xmit_frag,
 124                                   frag_length - state->received);
 125         io->readx.in.maxcnt = io->readx.in.mincnt;
 126         io->readx.out.data = state->data.data + state->received;
 127
 128         state->req = smb_raw_read_send(smb->tree, io);
 129         if (state->req == NULL) {
 130                 pipe_dead(state->c, NT_STATUS_NO_MEMORY);
 131                 talloc_free(state);
 132                 return;
 133         }
 134
 135         state->req->async.fn = smb_read_callback;
 136         state->req->async.private = state;
 137 }
 138
 139 /*
 140   trigger a read request from the server, possibly with some initial
 141   data in the read buffer
 142 */
 143 static NTSTATUS send_read_request_continue(struct dcerpc_connection *c, DATA_BLOB *blob)
 144 {
 145         struct smb_private *smb = (struct smb_private *)c->transport.private_data;
 146         union smb_read *io;
 147         struct smb_read_state *state;
 148         struct smbcli_request *req;
 149
 150         state = talloc(smb, struct smb_read_state);
 151         if (state == NULL) {
 152                 return NT_STATUS_NO_MEMORY;
 153         }
 154
 155         state->c = c;
 156         if (blob == NULL) {
 157                 state->received = 0;
 158                 state->data = data_blob_talloc(state, NULL, 0x2000);
 159         } else {
 160                 uint32_t frag_length = blob->length>=16?
 161                         dcerpc_get_frag_length(blob):0x2000;
 162                 state->received = blob->length;
 163                 state->data = data_blob_talloc(state, NULL, frag_length);
 164                 if (!state->data.data) {
 165                         talloc_free(state);
 166                         return NT_STATUS_NO_MEMORY;
 167                 }
 168                 memcpy(state->data.data, blob->data, blob->length);
 169         }
 170
 171         state->io = talloc(state, union smb_read);
 172
 173         io = state->io;
 174         io->generic.level = RAW_READ_READX;
 175         io->readx.in.file.fnum = smb->fnum;
 176         io->readx.in.mincnt = state->data.length - state->received;
 177         io->readx.in.maxcnt = io->readx.in.mincnt;
 178         io->readx.in.offset = 0;
 179         io->readx.in.remaining = 0;
 180         io->readx.in.read_for_execute = false;
 181         io->readx.out.data = state->data.data + state->received;
 182         req = smb_raw_read_send(smb->tree, io);
 183         if (req == NULL) {
 184                 return NT_STATUS_NO_MEMORY;
 185         }
 186
 187         req->async.fn = smb_read_callback;
 188         req->async.private = state;
 189
 190         state->req = req;
 191
 192         return NT_STATUS_OK;
 193 }
 194
 195
 196 /*
 197   trigger a read request from the server
 198 */
 199 static NTSTATUS send_read_request(struct dcerpc_connection *c)
 200 {
 201         struct smb_private *smb = (struct smb_private *)c->transport.private_data;
 202
 203         if (smb->dead) {
 204                 return NT_STATUS_CONNECTION_DISCONNECTED;
 205         }
 206
 207         return send_read_request_continue(c, NULL);
 208 }
 209
 210 /*
 211    this holds the state of an in-flight trans call
 212 */
 213 struct smb_trans_state {
 214         struct dcerpc_connection *c;
 215         struct smbcli_request *req;
 216         struct smb_trans2 *trans;
 217 };
 218
 219 /*
 220   called when a trans request has completed
 221 */
 222 static void smb_trans_callback(struct smbcli_request *req)
 223 {
 224         struct smb_trans_state *state = (struct smb_trans_state *)req->async.private;
 225         struct dcerpc_connection *c = state->c;
 226         NTSTATUS status;
 227
 228         status = smb_raw_trans_recv(req, state, state->trans);
 229
 230         if (NT_STATUS_IS_ERR(status)) {
 231                 pipe_dead(c, status);
 232                 return;
 233         }
 234
 235         if (!NT_STATUS_EQUAL(status, STATUS_BUFFER_OVERFLOW)) {
 236                 DATA_BLOB data = state->trans->out.data;
 237                 talloc_steal(c, data.data);
 238                 talloc_free(state);
 239                 c->transport.recv_data(c, &data, NT_STATUS_OK);
 240                 return;
 241         }
 242
 243         /* there is more to receive - setup a readx */
 244         send_read_request_continue(c, &state->trans->out.data);
 245         talloc_free(state);
 246 }
 247
 248 /*
 249   send a SMBtrans style request
 250 */
 251 static NTSTATUS smb_send_trans_request(struct dcerpc_connection *c, DATA_BLOB *blob)
 252 {
 253         struct smb_private *smb = (struct smb_private *)c->transport.private_data;
 254         struct smb_trans2 *trans;
 255         uint16_t setup[2];
 256         struct smb_trans_state *state;
 257
 258         state = talloc(smb, struct smb_trans_state);
 259         if (state == NULL) {
 260                 return NT_STATUS_NO_MEMORY;
 261         }
 262
 263         state->c = c;
 264         state->trans = talloc(state, struct smb_trans2);
 265         trans = state->trans;
 266
 267         trans->in.data = *blob;
 268         trans->in.params = data_blob(NULL, 0);
 269
 270         setup[0] = TRANSACT_DCERPCCMD;
 271         setup[1] = smb->fnum;
 272
 273         trans->in.max_param = 0;
 274         trans->in.max_data = smb_raw_max_trans_data(smb->tree, 0);
 275         trans->in.max_setup = 0;
 276         trans->in.setup_count = 2;
 277         trans->in.flags = 0;
 278         trans->in.timeout = 0;
 279         trans->in.setup = setup;
 280         trans->in.trans_name = "\\PIPE\\";
 281
 282         state->req = smb_raw_trans_send(smb->tree, trans);
 283         if (state->req == NULL) {
 284                 talloc_free(state);
 285                 return NT_STATUS_NO_MEMORY;
 286         }
 287
 288         state->req->async.fn = smb_trans_callback;
 289         state->req->async.private = state;
 290
 291         talloc_steal(state, state->req);
 292
 293         return NT_STATUS_OK;
 294 }
 295
 296 /*
 297   called when a write request has completed
 298 */
 299 static void smb_write_callback(struct smbcli_request *req)
 300 {
 301         struct dcerpc_connection *c = (struct dcerpc_connection *)req->async.private;
 302
 303         if (!NT_STATUS_IS_OK(req->status)) {
 304                 DEBUG(0,("dcerpc_smb: write callback error\n"));
 305                 pipe_dead(c, req->status);
 306         }
 307
 308         smbcli_request_destroy(req);
 309 }
 310
 311 /*
 312    send a packet to the server
 313 */
 314 static NTSTATUS smb_send_request(struct dcerpc_connection *c, DATA_BLOB *blob,
 315                                  bool trigger_read)
 316 {
 317         struct smb_private *smb = (struct smb_private *)c->transport.private_data;
 318         union smb_write io;
 319         struct smbcli_request *req;
 320
 321         if (smb->dead) {
 322                 return NT_STATUS_CONNECTION_DISCONNECTED;
 323         }
 324
 325         if (trigger_read) {
 326                 return smb_send_trans_request(c, blob);
 327         }
 328
 329         io.generic.level = RAW_WRITE_WRITEX;
 330         io.writex.in.file.fnum = smb->fnum;
 331         io.writex.in.offset = 0;
 332         io.writex.in.wmode = PIPE_START_MESSAGE;
 333         io.writex.in.remaining = blob->length;
 334         io.writex.in.count = blob->length;
 335         io.writex.in.data = blob->data;
 336
 337         /* we must not timeout at the smb level for rpc requests, as otherwise
 338            signing/sealing can be messed up */
 339         smb->tree->session->transport->options.request_timeout = 0;
 340
 341         req = smb_raw_write_send(smb->tree, &io);
 342         if (req == NULL) {
 343                 return NT_STATUS_NO_MEMORY;
 344         }
 345
 346         req->async.fn = smb_write_callback;
 347         req->async.private = c;
 348
 349         if (trigger_read) {
 350                 send_read_request(c);
 351         }
 352
 353         return NT_STATUS_OK;
 354 }
 355
 356 /*
 357    shutdown SMB pipe connection
 358 */
 359 static NTSTATUS smb_shutdown_pipe(struct dcerpc_connection *c, NTSTATUS status)
 360 {
 361         struct smb_private *smb = (struct smb_private *)c->transport.private_data;
 362         union smb_close io;
 363         struct smbcli_request *req;
 364
 365         /* maybe we're still starting up */
 366         if (!smb) return status;
 367
 368         io.close.level = RAW_CLOSE_CLOSE;
 369         io.close.in.file.fnum = smb->fnum;
 370         io.close.in.write_time = 0;
 371         req = smb_raw_close_send(smb->tree, &io);
 372         if (req != NULL) {
 373                 /* we don't care if this fails, so just free it if it succeeds */
 374                 req->async.fn = (void (*)(struct smbcli_request *))talloc_free;
 375         }
 376
 377         talloc_free(smb);
 378
 379         return status;
 380 }
 381
 382 /*
 383   return SMB server name (called name)
 384 */
 385 static const char *smb_peer_name(struct dcerpc_connection *c)
 386 {
 387         struct smb_private *smb = (struct smb_private *)c->transport.private_data;
 388         return smb->server_name;
 389 }
 390
 391 /*
 392   return remote name we make the actual connection (good for kerberos)
 393 */
 394 static const char *smb_target_hostname(struct dcerpc_connection *c)
 395 {
 396         struct smb_private *smb = talloc_get_type(c->transport.private_data, struct smb_private);
 397         return smb->tree->session->transport->socket->hostname;
 398 }
 399
 400 /*
 401   fetch the user session key
 402 */
 403 static NTSTATUS smb_session_key(struct dcerpc_connection *c, DATA_BLOB *session_key)
 404 {
 405         struct smb_private *smb = (struct smb_private *)c->transport.private_data;
 406
 407         if (smb->tree->session->user_session_key.data) {
 408                 *session_key = smb->tree->session->user_session_key;
 409                 return NT_STATUS_OK;
 410         }
 411         return NT_STATUS_NO_USER_SESSION_KEY;
 412 }
 413
 414 struct pipe_open_smb_state {
 415         union smb_open *open;
 416         struct dcerpc_connection *c;
 417         struct smbcli_tree *tree;
 418         struct composite_context *ctx;
 419 };
 420
 421 static void pipe_open_recv(struct smbcli_request *req);
 422
 423 struct composite_context *dcerpc_pipe_open_smb_send(struct dcerpc_pipe *p,
 424                                                     struct smbcli_tree *tree,
 425                                                     const char *pipe_name)
 426 {
 427         struct composite_context *ctx;
 428         struct pipe_open_smb_state *state;
 429         struct smbcli_request *req;
 430         struct dcerpc_connection *c = p->conn;
 431
 432         /* if we don't have a binding on this pipe yet, then create one */
 433         if (p->binding == NULL) {
 434                 NTSTATUS status;
 435                 char *s;
 436                 SMB_ASSERT(tree->session->transport->socket->hostname != NULL);
 437                 s = talloc_asprintf(p, "ncacn_np:%s", tree->session->transport->socket->hostname);
 438                 if (s == NULL) return NULL;
 439                 status = dcerpc_parse_binding(p, s, &p->binding);
 440                 talloc_free(s);
 441                 if (!NT_STATUS_IS_OK(status)) {
 442                         return NULL;
 443                 }
 444         }
 445
 446         ctx = composite_create(c, c->event_ctx);
 447         if (ctx == NULL) return NULL;
 448
 449         state = talloc(ctx, struct pipe_open_smb_state);
 450         if (composite_nomem(state, ctx)) return ctx;
 451         ctx->private_data = state;
 452
 453         state->c = c;
 454         state->tree = tree;
 455         state->ctx = ctx;
 456
 457         state->open = talloc(state, union smb_open);
 458         if (composite_nomem(state->open, ctx)) return ctx;
 459
 460         state->open->ntcreatex.level = RAW_OPEN_NTCREATEX;
 461         state->open->ntcreatex.in.flags = 0;
 462         state->open->ntcreatex.in.root_fid = 0;
 463         state->open->ntcreatex.in.access_mask =
 464                 SEC_STD_READ_CONTROL |
 465                 SEC_FILE_WRITE_ATTRIBUTE |
 466                 SEC_FILE_WRITE_EA |
 467                 SEC_FILE_READ_DATA |
 468                 SEC_FILE_WRITE_DATA;
 469         state->open->ntcreatex.in.file_attr = 0;
 470         state->open->ntcreatex.in.alloc_size = 0;
 471         state->open->ntcreatex.in.share_access =
 472                 NTCREATEX_SHARE_ACCESS_READ |
 473                 NTCREATEX_SHARE_ACCESS_WRITE;
 474         state->open->ntcreatex.in.open_disposition = NTCREATEX_DISP_OPEN;
 475         state->open->ntcreatex.in.create_options = 0;
 476         state->open->ntcreatex.in.impersonation =
 477                 NTCREATEX_IMPERSONATION_IMPERSONATION;
 478         state->open->ntcreatex.in.security_flags = 0;
 479
 480         if ((strncasecmp(pipe_name, "/pipe/", 6) == 0) ||
 481             (strncasecmp(pipe_name, "\\pipe\\", 6) == 0)) {
 482                 pipe_name += 6;
 483         }
 484         state->open->ntcreatex.in.fname =
 485                 (pipe_name[0] == '\\') ?
 486                 talloc_strdup(state->open, pipe_name) :
 487                 talloc_asprintf(state->open, "\\%s", pipe_name);
 488         if (composite_nomem(state->open->ntcreatex.in.fname, ctx)) return ctx;
 489
 490         req = smb_raw_open_send(tree, state->open);
 491         composite_continue_smb(ctx, req, pipe_open_recv, state);
 492         return ctx;
 493 }
 494
 495 static void pipe_open_recv(struct smbcli_request *req)
 496 {
 497         struct pipe_open_smb_state *state = talloc_get_type(req->async.private,
 498                                             struct pipe_open_smb_state);
 499         struct composite_context *ctx = state->ctx;
 500         struct dcerpc_connection *c = state->c;
 501         struct smb_private *smb;
 502
 503         ctx->status = smb_raw_open_recv(req, state, state->open);
 504         if (!composite_is_ok(ctx)) return;
 505
 506         /*
 507           fill in the transport methods
 508         */
 509         c->transport.transport       = NCACN_NP;
 510         c->transport.private_data    = NULL;
 511         c->transport.shutdown_pipe   = smb_shutdown_pipe;
 512         c->transport.peer_name       = smb_peer_name;
 513         c->transport.target_hostname = smb_target_hostname;
 514
 515         c->transport.send_request    = smb_send_request;
 516         c->transport.send_read       = send_read_request;
 517         c->transport.recv_data       = NULL;
 518
 519         /* Over-ride the default session key with the SMB session key */
 520         c->security_state.session_key = smb_session_key;
 521
 522         smb = talloc(c, struct smb_private);
 523         if (composite_nomem(smb, ctx)) return;
 524
 525         smb->fnum       = state->open->ntcreatex.out.file.fnum;
 526         smb->tree       = talloc_reference(smb, state->tree);
 527         smb->server_name= strupper_talloc(smb,
 528                           state->tree->session->transport->called.name);
 529         if (composite_nomem(smb->server_name, ctx)) return;
 530         smb->dead       = false;
 531
 532         c->transport.private_data = smb;
 533
 534         composite_done(ctx);
 535 }
 536
 537 NTSTATUS dcerpc_pipe_open_smb_recv(struct composite_context *c)
 538 {
 539         NTSTATUS status = composite_wait(c);
 540         talloc_free(c);
 541         return status;
 542 }
 543
 544 _PUBLIC_ NTSTATUS dcerpc_pipe_open_smb(struct dcerpc_pipe *p,
 545                               struct smbcli_tree *tree,
 546                               const char *pipe_name)
 547 {
 548         struct composite_context *ctx = dcerpc_pipe_open_smb_send(p, tree,
 549                                                                   pipe_name);
 550         return dcerpc_pipe_open_smb_recv(ctx);
 551 }
 552
 553 /*
 554   return the SMB tree used for a dcerpc over SMB pipe
 555 */
 556 _PUBLIC_ struct smbcli_tree *dcerpc_smb_tree(struct dcerpc_connection *c)
 557 {
 558         struct smb_private *smb;
 559
 560         if (c->transport.transport != NCACN_NP) return NULL;
 561
 562         smb = talloc_get_type(c->transport.private_data, struct smb_private);
 563         if (!smb) return NULL;
 564
 565         return smb->tree;
 566 }
 567
 568 /*
 569   return the SMB fnum used for a dcerpc over SMB pipe (hack for torture operations)
 570 */
 571 _PUBLIC_ uint16_t dcerpc_smb_fnum(struct dcerpc_connection *c)
 572 {
 573         struct smb_private *smb;
 574
 575         if (c->transport.transport != NCACN_NP) return 0;
 576
 577         smb = talloc_get_type(c->transport.private_data, struct smb_private);
 578         if (!smb) return 0;
 579
 580         return smb->fnum;
 581 }