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 2 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, write to the Free Software
  21    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22 */
  23
  24 #include "includes.h"
  25 #include "libcli/raw/libcliraw.h"
  26 #include "libcli/composite/composite.h"
  27 #include "librpc/rpc/dcerpc.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 = 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 = 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 = 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 = 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 = 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 = 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, BOOL trigger_read)
 315 {
 316         struct smb_private *smb = c->transport.private_data;
 317         union smb_write io;
 318         struct smbcli_request *req;
 319
 320         if (smb->dead) {
 321                 return NT_STATUS_CONNECTION_DISCONNECTED;
 322         }
 323
 324         if (trigger_read) {
 325                 return smb_send_trans_request(c, blob);
 326         }
 327
 328         io.generic.level = RAW_WRITE_WRITEX;
 329         io.writex.in.file.fnum = smb->fnum;
 330         io.writex.in.offset = 0;
 331         io.writex.in.wmode = PIPE_START_MESSAGE;
 332         io.writex.in.remaining = blob->length;
 333         io.writex.in.count = blob->length;
 334         io.writex.in.data = blob->data;
 335
 336         /* we must not timeout at the smb level for rpc requests, as otherwise
 337            signing/sealing can be messed up */
 338         smb->tree->session->transport->options.request_timeout = 0;
 339
 340         req = smb_raw_write_send(smb->tree, &io);
 341         if (req == NULL) {
 342                 return NT_STATUS_NO_MEMORY;
 343         }
 344
 345         req->async.fn = smb_write_callback;
 346         req->async.private = c;
 347
 348         if (trigger_read) {
 349                 send_read_request(c);
 350         }
 351
 352         return NT_STATUS_OK;
 353 }
 354
 355 /*
 356    shutdown SMB pipe connection
 357 */
 358 static NTSTATUS smb_shutdown_pipe(struct dcerpc_connection *c, NTSTATUS status)
 359 {
 360         struct smb_private *smb = c->transport.private_data;
 361         union smb_close io;
 362         struct smbcli_request *req;
 363
 364         /* maybe we're still starting up */
 365         if (!smb) return status;
 366
 367         io.close.level = RAW_CLOSE_CLOSE;
 368         io.close.in.file.fnum = smb->fnum;
 369         io.close.in.write_time = 0;
 370         req = smb_raw_close_send(smb->tree, &io);
 371         if (req != NULL) {
 372                 /* we don't care if this fails, so just free it if it succeeds */
 373                 req->async.fn = (void (*)(struct smbcli_request *))talloc_free;
 374         }
 375
 376         talloc_free(smb);
 377
 378         return status;
 379 }
 380
 381 /*
 382   return SMB server name (called name)
 383 */
 384 static const char *smb_peer_name(struct dcerpc_connection *c)
 385 {
 386         struct smb_private *smb = c->transport.private_data;
 387         return smb->server_name;
 388 }
 389
 390 /*
 391   return remote name we make the actual connection (good for kerberos)
 392 */
 393 static const char *smb_target_hostname(struct dcerpc_connection *c)
 394 {
 395         struct smb_private *smb = talloc_get_type(c->transport.private_data, struct smb_private);
 396         return smb->tree->session->transport->socket->hostname;
 397 }
 398
 399 /*
 400   fetch the user session key
 401 */
 402 static NTSTATUS smb_session_key(struct dcerpc_connection *c, DATA_BLOB *session_key)
 403 {
 404         struct smb_private *smb = c->transport.private_data;
 405
 406         if (smb->tree->session->user_session_key.data) {
 407                 *session_key = smb->tree->session->user_session_key;
 408                 return NT_STATUS_OK;
 409         }
 410         return NT_STATUS_NO_USER_SESSION_KEY;
 411 }
 412
 413 struct pipe_open_smb_state {
 414         union smb_open *open;
 415         struct dcerpc_connection *c;
 416         struct smbcli_tree *tree;
 417         struct composite_context *ctx;
 418 };
 419
 420 static void pipe_open_recv(struct smbcli_request *req);
 421
 422 struct composite_context *dcerpc_pipe_open_smb_send(struct dcerpc_pipe *p,
 423                                                     struct smbcli_tree *tree,
 424                                                     const char *pipe_name)
 425 {
 426         struct composite_context *ctx;
 427         struct pipe_open_smb_state *state;
 428         struct smbcli_request *req;
 429         struct dcerpc_connection *c = p->conn;
 430
 431         /* if we don't have a binding on this pipe yet, then create one */
 432         if (p->binding == NULL) {
 433                 NTSTATUS status;
 434                 char *s = talloc_asprintf(p, "ncacn_np:%s", tree->session->transport->socket->hostname);
 435                 if (s == NULL) return NULL;
 436                 status = dcerpc_parse_binding(p, s, &p->binding);
 437                 talloc_free(s);
 438                 if (!NT_STATUS_IS_OK(status)) {
 439                         return NULL;
 440                 }
 441         }
 442
 443         ctx = composite_create(c, c->event_ctx);
 444         if (ctx == NULL) return NULL;
 445
 446         state = talloc(ctx, struct pipe_open_smb_state);
 447         if (composite_nomem(state, ctx)) return ctx;
 448         ctx->private_data = state;
 449
 450         state->c = c;
 451         state->tree = tree;
 452         state->ctx = ctx;
 453
 454         state->open = talloc(state, union smb_open);
 455         if (composite_nomem(state->open, ctx)) return ctx;
 456
 457         state->open->ntcreatex.level = RAW_OPEN_NTCREATEX;
 458         state->open->ntcreatex.in.flags = 0;
 459         state->open->ntcreatex.in.root_fid = 0;
 460         state->open->ntcreatex.in.access_mask =
 461                 SEC_STD_READ_CONTROL |
 462                 SEC_FILE_WRITE_ATTRIBUTE |
 463                 SEC_FILE_WRITE_EA |
 464                 SEC_FILE_READ_DATA |
 465                 SEC_FILE_WRITE_DATA;
 466         state->open->ntcreatex.in.file_attr = 0;
 467         state->open->ntcreatex.in.alloc_size = 0;
 468         state->open->ntcreatex.in.share_access =
 469                 NTCREATEX_SHARE_ACCESS_READ |
 470                 NTCREATEX_SHARE_ACCESS_WRITE;
 471         state->open->ntcreatex.in.open_disposition = NTCREATEX_DISP_OPEN;
 472         state->open->ntcreatex.in.create_options = 0;
 473         state->open->ntcreatex.in.impersonation =
 474                 NTCREATEX_IMPERSONATION_IMPERSONATION;
 475         state->open->ntcreatex.in.security_flags = 0;
 476
 477         if ((strncasecmp(pipe_name, "/pipe/", 6) == 0) ||
 478             (strncasecmp(pipe_name, "\\pipe\\", 6) == 0)) {
 479                 pipe_name += 6;
 480         }
 481         state->open->ntcreatex.in.fname =
 482                 (pipe_name[0] == '\\') ?
 483                 talloc_strdup(state->open, pipe_name) :
 484                 talloc_asprintf(state->open, "\\%s", pipe_name);
 485         if (composite_nomem(state->open->ntcreatex.in.fname, ctx)) return ctx;
 486
 487         req = smb_raw_open_send(tree, state->open);
 488         composite_continue_smb(ctx, req, pipe_open_recv, state);
 489         return ctx;
 490 }
 491
 492 static void pipe_open_recv(struct smbcli_request *req)
 493 {
 494         struct pipe_open_smb_state *state = talloc_get_type(req->async.private,
 495                                             struct pipe_open_smb_state);
 496         struct composite_context *ctx = state->ctx;
 497         struct dcerpc_connection *c = state->c;
 498         struct smb_private *smb;
 499
 500         ctx->status = smb_raw_open_recv(req, state, state->open);
 501         if (!composite_is_ok(ctx)) return;
 502
 503         /*
 504           fill in the transport methods
 505         */
 506         c->transport.transport       = NCACN_NP;
 507         c->transport.private_data    = NULL;
 508         c->transport.shutdown_pipe   = smb_shutdown_pipe;
 509         c->transport.peer_name       = smb_peer_name;
 510         c->transport.target_hostname = smb_target_hostname;
 511
 512         c->transport.send_request    = smb_send_request;
 513         c->transport.send_read       = send_read_request;
 514         c->transport.recv_data       = NULL;
 515
 516         /* Over-ride the default session key with the SMB session key */
 517         c->security_state.session_key = smb_session_key;
 518
 519         smb = talloc(c, struct smb_private);
 520         if (composite_nomem(smb, ctx)) return;
 521
 522         smb->fnum       = state->open->ntcreatex.out.file.fnum;
 523         smb->tree       = talloc_reference(smb, state->tree);
 524         smb->server_name= strupper_talloc(smb,
 525                           state->tree->session->transport->called.name);
 526         if (composite_nomem(smb->server_name, ctx)) return;
 527         smb->dead       = false;
 528
 529         c->transport.private_data = smb;
 530
 531         composite_done(ctx);
 532 }
 533
 534 NTSTATUS dcerpc_pipe_open_smb_recv(struct composite_context *c)
 535 {
 536         NTSTATUS status = composite_wait(c);
 537         talloc_free(c);
 538         return status;
 539 }
 540
 541 NTSTATUS dcerpc_pipe_open_smb(struct dcerpc_pipe *p,
 542                               struct smbcli_tree *tree,
 543                               const char *pipe_name)
 544 {
 545         struct composite_context *ctx = dcerpc_pipe_open_smb_send(p, tree,
 546                                                                   pipe_name);
 547         return dcerpc_pipe_open_smb_recv(ctx);
 548 }
 549
 550 /*
 551   return the SMB tree used for a dcerpc over SMB pipe
 552 */
 553 struct smbcli_tree *dcerpc_smb_tree(struct dcerpc_connection *c)
 554 {
 555         struct smb_private *smb;
 556
 557         if (c->transport.transport != NCACN_NP) return NULL;
 558
 559         smb = talloc_get_type(c->transport.private_data, struct smb_private);
 560         if (!smb) return NULL;
 561
 562         return smb->tree;
 563 }
 564
 565 /*
 566   return the SMB fnum used for a dcerpc over SMB pipe (hack for torture operations)
 567 */
 568 uint16_t dcerpc_smb_fnum(struct dcerpc_connection *c)
 569 {
 570         struct smb_private *smb;
 571
 572         if (c->transport.transport != NCACN_NP) return 0;
 573
 574         smb = talloc_get_type(c->transport.private_data, struct smb_private);
 575         if (!smb) return 0;
 576
 577         return smb->fnum;
 578 }