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 "librpc/gen_ndr/ndr_security.h"
  27 #include "libcli/composite/composite.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 };
  35
  36
  37 /*
  38   tell the dcerpc layer that the transport is dead
  39 */
  40 static void pipe_dead(struct dcerpc_connection *c, NTSTATUS status)
  41 {
  42         c->transport.recv_data(c, NULL, status);
  43 }
  44
  45
  46 /*
  47    this holds the state of an in-flight call
  48 */
  49 struct smb_read_state {
  50         struct dcerpc_connection *c;
  51         struct smbcli_request *req;
  52         size_t received;
  53         DATA_BLOB data;
  54         union smb_read *io;
  55 };
  56
  57 /*
  58   called when a read request has completed
  59 */
  60 static void smb_read_callback(struct smbcli_request *req)
  61 {
  62         struct smb_private *smb;
  63         struct smb_read_state *state;
  64         union smb_read *io;
  65         uint16_t frag_length;
  66         NTSTATUS status;
  67
  68         state = req->async.private;
  69         smb = state->c->transport.private;
  70         io = state->io;
  71
  72         status = smb_raw_read_recv(state->req, io);
  73         if (NT_STATUS_IS_ERR(status)) {
  74                 pipe_dead(state->c, status);
  75                 talloc_free(state);
  76                 return;
  77         }
  78
  79         state->received += io->readx.out.nread;
  80
  81         if (state->received < 16) {
  82                 DEBUG(0,("dcerpc_smb: short packet (length %d) in read callback!\n",
  83                          (int)state->received));
  84                 pipe_dead(state->c, NT_STATUS_INFO_LENGTH_MISMATCH);
  85                 talloc_free(state);
  86                 return;
  87         }
  88
  89         frag_length = dcerpc_get_frag_length(&state->data);
  90
  91         if (frag_length <= state->received) {
  92                 state->data.length = state->received;
  93                 state->c->transport.recv_data(state->c, &state->data, NT_STATUS_OK);
  94                 talloc_free(state);
  95                 return;
  96         }
  97
  98         /* initiate another read request, as we only got part of a fragment */
  99         state->data.data = talloc_realloc(state, state->data.data, uint8_t, frag_length);
 100
 101         io->readx.in.mincnt = MIN(state->c->srv_max_xmit_frag,
 102                                   frag_length - state->received);
 103         io->readx.in.maxcnt = io->readx.in.mincnt;
 104         io->readx.out.data = state->data.data + state->received;
 105
 106         state->req = smb_raw_read_send(smb->tree, io);
 107         if (state->req == NULL) {
 108                 pipe_dead(state->c, NT_STATUS_NO_MEMORY);
 109                 talloc_free(state);
 110                 return;
 111         }
 112
 113         state->req->async.fn = smb_read_callback;
 114         state->req->async.private = state;
 115 }
 116
 117 /*
 118   trigger a read request from the server, possibly with some initial
 119   data in the read buffer
 120 */
 121 static NTSTATUS send_read_request_continue(struct dcerpc_connection *c, DATA_BLOB *blob)
 122 {
 123         struct smb_private *smb = c->transport.private;
 124         union smb_read *io;
 125         struct smb_read_state *state;
 126         struct smbcli_request *req;
 127
 128         state = talloc(smb, struct smb_read_state);
 129         if (state == NULL) {
 130                 return NT_STATUS_NO_MEMORY;
 131         }
 132
 133         state->c = c;
 134         if (blob == NULL) {
 135                 state->received = 0;
 136                 state->data = data_blob_talloc(state, NULL, 0x2000);
 137         } else {
 138                 uint32_t frag_length = blob->length>=16?
 139                         dcerpc_get_frag_length(blob):0x2000;
 140                 state->received = blob->length;
 141                 state->data = data_blob_talloc(state, NULL, frag_length);
 142                 if (!state->data.data) {
 143                         talloc_free(state);
 144                         return NT_STATUS_NO_MEMORY;
 145                 }
 146                 memcpy(state->data.data, blob->data, blob->length);
 147         }
 148
 149         state->io = talloc(state, union smb_read);
 150
 151         io = state->io;
 152         io->generic.level = RAW_READ_READX;
 153         io->readx.in.fnum = smb->fnum;
 154         io->readx.in.mincnt = state->data.length - state->received;
 155         io->readx.in.maxcnt = io->readx.in.mincnt;
 156         io->readx.in.offset = 0;
 157         io->readx.in.remaining = 0;
 158         io->readx.out.data = state->data.data + state->received;
 159         req = smb_raw_read_send(smb->tree, io);
 160         if (req == NULL) {
 161                 return NT_STATUS_NO_MEMORY;
 162         }
 163
 164         req->async.fn = smb_read_callback;
 165         req->async.private = state;
 166
 167         state->req = req;
 168
 169         return NT_STATUS_OK;
 170 }
 171
 172
 173 /*
 174   trigger a read request from the server
 175 */
 176 static NTSTATUS send_read_request(struct dcerpc_connection *c)
 177 {
 178         return send_read_request_continue(c, NULL);
 179 }
 180
 181 /*
 182    this holds the state of an in-flight trans call
 183 */
 184 struct smb_trans_state {
 185         struct dcerpc_connection *c;
 186         struct smbcli_request *req;
 187         struct smb_trans2 *trans;
 188 };
 189
 190 /*
 191   called when a trans request has completed
 192 */
 193 static void smb_trans_callback(struct smbcli_request *req)
 194 {
 195         struct smb_trans_state *state = req->async.private;
 196         struct dcerpc_connection *c = state->c;
 197         NTSTATUS status;
 198
 199         status = smb_raw_trans_recv(req, state, state->trans);
 200
 201         if (NT_STATUS_IS_ERR(status)) {
 202                 pipe_dead(c, status);
 203                 return;
 204         }
 205
 206         if (!NT_STATUS_EQUAL(status, STATUS_BUFFER_OVERFLOW)) {
 207                 c->transport.recv_data(c, &state->trans->out.data, NT_STATUS_OK);
 208                 talloc_free(state);
 209                 return;
 210         }
 211
 212         /* there is more to receive - setup a readx */
 213         send_read_request_continue(c, &state->trans->out.data);
 214         talloc_free(state);
 215 }
 216
 217 /*
 218   send a SMBtrans style request
 219 */
 220 static NTSTATUS smb_send_trans_request(struct dcerpc_connection *c, DATA_BLOB *blob)
 221 {
 222         struct smb_private *smb = c->transport.private;
 223         struct smb_trans2 *trans;
 224         uint16_t setup[2];
 225         struct smb_trans_state *state;
 226
 227         state = talloc(smb, struct smb_trans_state);
 228         if (state == NULL) {
 229                 return NT_STATUS_NO_MEMORY;
 230         }
 231
 232         state->c = c;
 233         state->trans = talloc(state, struct smb_trans2);
 234         trans = state->trans;
 235
 236         trans->in.data = *blob;
 237         trans->in.params = data_blob(NULL, 0);
 238
 239         setup[0] = TRANSACT_DCERPCCMD;
 240         setup[1] = smb->fnum;
 241
 242         trans->in.max_param = 0;
 243         trans->in.max_data = smb_raw_max_trans_data(smb->tree, 0);
 244         trans->in.max_setup = 0;
 245         trans->in.setup_count = 2;
 246         trans->in.flags = 0;
 247         trans->in.timeout = 0;
 248         trans->in.setup = setup;
 249         trans->in.trans_name = "\\PIPE\\";
 250
 251         state->req = smb_raw_trans_send(smb->tree, trans);
 252         if (state->req == NULL) {
 253                 talloc_free(state);
 254                 return NT_STATUS_NO_MEMORY;
 255         }
 256
 257         state->req->async.fn = smb_trans_callback;
 258         state->req->async.private = state;
 259
 260         return NT_STATUS_OK;
 261 }
 262
 263 /*
 264   called when a write request has completed
 265 */
 266 static void smb_write_callback(struct smbcli_request *req)
 267 {
 268         struct dcerpc_connection *c = req->async.private;
 269
 270         if (!NT_STATUS_IS_OK(req->status)) {
 271                 DEBUG(0,("dcerpc_smb: write callback error\n"));
 272                 pipe_dead(c, req->status);
 273         }
 274
 275         smbcli_request_destroy(req);
 276 }
 277
 278 /*
 279    send a packet to the server
 280 */
 281 static NTSTATUS smb_send_request(struct dcerpc_connection *c, DATA_BLOB *blob, BOOL trigger_read)
 282 {
 283         struct smb_private *smb = c->transport.private;
 284         union smb_write io;
 285         struct smbcli_request *req;
 286
 287         if (trigger_read) {
 288                 return smb_send_trans_request(c, blob);
 289         }
 290
 291         io.generic.level = RAW_WRITE_WRITEX;
 292         io.writex.in.fnum = smb->fnum;
 293         io.writex.in.offset = 0;
 294         io.writex.in.wmode = PIPE_START_MESSAGE;
 295         io.writex.in.remaining = blob->length;
 296         io.writex.in.count = blob->length;
 297         io.writex.in.data = blob->data;
 298
 299         /* we must not timeout at the smb level for rpc requests, as otherwise
 300            signing/sealing can be messed up */
 301         smb->tree->session->transport->options.request_timeout = 0;
 302
 303         req = smb_raw_write_send(smb->tree, &io);
 304         if (req == NULL) {
 305                 return NT_STATUS_NO_MEMORY;
 306         }
 307
 308         req->async.fn = smb_write_callback;
 309         req->async.private = c;
 310
 311         if (trigger_read) {
 312                 send_read_request(c);
 313         }
 314
 315         return NT_STATUS_OK;
 316 }
 317
 318 /*
 319    shutdown SMB pipe connection
 320 */
 321 static NTSTATUS smb_shutdown_pipe(struct dcerpc_connection *c)
 322 {
 323         struct smb_private *smb = c->transport.private;
 324         union smb_close io;
 325
 326         /* maybe we're still starting up */
 327         if (!smb) return NT_STATUS_OK;
 328
 329         io.close.level = RAW_CLOSE_CLOSE;
 330         io.close.in.fnum = smb->fnum;
 331         io.close.in.write_time = 0;
 332         smb_raw_close(smb->tree, &io);
 333
 334         talloc_free(smb);
 335
 336         return NT_STATUS_OK;
 337 }
 338
 339 /*
 340   return SMB server name
 341 */
 342 static const char *smb_peer_name(struct dcerpc_connection *c)
 343 {
 344         struct smb_private *smb = c->transport.private;
 345         return smb->server_name;
 346 }
 347
 348 /*
 349   fetch the user session key
 350 */
 351 static NTSTATUS smb_session_key(struct dcerpc_connection *c, DATA_BLOB *session_key)
 352 {
 353         struct smb_private *smb = c->transport.private;
 354
 355         if (smb->tree->session->user_session_key.data) {
 356                 *session_key = smb->tree->session->user_session_key;
 357                 return NT_STATUS_OK;
 358         }
 359         return NT_STATUS_NO_USER_SESSION_KEY;
 360 }
 361
 362 struct pipe_open_smb_state {
 363         union smb_open *open;
 364         struct dcerpc_connection *c;
 365         struct smbcli_request *req;
 366         struct smbcli_tree *tree;
 367         struct composite_context *ctx;
 368 };
 369
 370 static void pipe_open_recv(struct smbcli_request *req);
 371
 372 struct composite_context *dcerpc_pipe_open_smb_send(struct dcerpc_connection *c,
 373                                                     struct smbcli_tree *tree,
 374                                                     const char *pipe_name)
 375 {
 376         struct composite_context *ctx;
 377         struct pipe_open_smb_state *state;
 378
 379         ctx = talloc_zero(NULL, struct composite_context);
 380         if (ctx == NULL) goto failed;
 381         ctx->state = COMPOSITE_STATE_IN_PROGRESS;
 382         ctx->event_ctx = talloc_reference(c, c->event_ctx);
 383
 384         state = talloc(ctx, struct pipe_open_smb_state);
 385         if (state == NULL) goto failed;
 386
 387         state->c = c;
 388         state->tree = tree;
 389         state->ctx = ctx;
 390
 391         state->open = talloc(state, union smb_open);
 392         if (state->open == NULL) goto failed;
 393
 394         state->open->ntcreatex.level = RAW_OPEN_NTCREATEX;
 395         state->open->ntcreatex.in.flags = 0;
 396         state->open->ntcreatex.in.root_fid = 0;
 397         state->open->ntcreatex.in.access_mask =
 398                 SEC_STD_READ_CONTROL |
 399                 SEC_FILE_WRITE_ATTRIBUTE |
 400                 SEC_FILE_WRITE_EA |
 401                 SEC_FILE_READ_DATA |
 402                 SEC_FILE_WRITE_DATA;
 403         state->open->ntcreatex.in.file_attr = 0;
 404         state->open->ntcreatex.in.alloc_size = 0;
 405         state->open->ntcreatex.in.share_access =
 406                 NTCREATEX_SHARE_ACCESS_READ |
 407                 NTCREATEX_SHARE_ACCESS_WRITE;
 408         state->open->ntcreatex.in.open_disposition = NTCREATEX_DISP_OPEN;
 409         state->open->ntcreatex.in.create_options = 0;
 410         state->open->ntcreatex.in.impersonation =
 411                 NTCREATEX_IMPERSONATION_IMPERSONATION;
 412         state->open->ntcreatex.in.security_flags = 0;
 413
 414         if ((strncasecmp(pipe_name, "/pipe/", 6) == 0) ||
 415             (strncasecmp(pipe_name, "\\pipe\\", 6) == 0)) {
 416                 pipe_name += 6;
 417         }
 418         state->open->ntcreatex.in.fname =
 419                 (pipe_name[0] == '\\') ?
 420                 talloc_strdup(state->open, pipe_name) :
 421                 talloc_asprintf(state->open, "\\%s", pipe_name);
 422         if (state->open->ntcreatex.in.fname == NULL) goto failed;
 423
 424         state->req = smb_raw_open_send(tree, state->open);
 425         if (state->req == NULL) goto failed;
 426
 427         state->req->async.fn = pipe_open_recv;
 428         state->req->async.private = state;
 429
 430         return ctx;
 431
 432  failed:
 433         talloc_free(ctx);
 434         return NULL;
 435 }
 436
 437 static void pipe_open_recv(struct smbcli_request *req)
 438 {
 439         struct pipe_open_smb_state *state =
 440                 talloc_get_type(req->async.private,
 441                                 struct pipe_open_smb_state);
 442         struct composite_context *ctx = state->ctx;
 443         struct dcerpc_connection *c = state->c;
 444         struct smb_private *smb;
 445
 446         ctx->status = smb_raw_open_recv(req, state, state->open);
 447         if (!NT_STATUS_IS_OK(ctx->status)) goto done;
 448
 449         /*
 450           fill in the transport methods
 451         */
 452         c->transport.transport = NCACN_NP;
 453         c->transport.private = NULL;
 454         c->transport.shutdown_pipe = smb_shutdown_pipe;
 455         c->transport.peer_name = smb_peer_name;
 456
 457         c->transport.send_request = smb_send_request;
 458         c->transport.send_read = send_read_request;
 459         c->transport.recv_data = NULL;
 460
 461         /* Over-ride the default session key with the SMB session key */
 462         c->security_state.session_key = smb_session_key;
 463
 464         smb = talloc(c, struct smb_private);
 465         if (smb == NULL) {
 466                 ctx->status = NT_STATUS_NO_MEMORY;
 467                 goto done;
 468         }
 469
 470         smb->fnum       = state->open->ntcreatex.out.fnum;
 471         smb->tree       = talloc_reference(smb, state->tree);
 472         smb->server_name= strupper_talloc(
 473                 smb, state->tree->session->transport->socket->hostname);
 474         if (smb->server_name == NULL) {
 475                 ctx->status = NT_STATUS_NO_MEMORY;
 476                 goto done;
 477         }
 478         c->transport.private = smb;
 479
 480         ctx->status = NT_STATUS_OK;
 481         ctx->state = COMPOSITE_STATE_DONE;
 482
 483  done:
 484         if (!NT_STATUS_IS_OK(ctx->status)) {
 485                 ctx->state = COMPOSITE_STATE_ERROR;
 486         }
 487         if ((ctx->state >= COMPOSITE_STATE_DONE) &&
 488             (ctx->async.fn != NULL)) {
 489                 ctx->async.fn(ctx);
 490         }
 491 }
 492
 493 NTSTATUS dcerpc_pipe_open_smb_recv(struct composite_context *c)
 494 {
 495         NTSTATUS status = composite_wait(c);
 496         talloc_free(c);
 497         return status;
 498 }
 499
 500 NTSTATUS dcerpc_pipe_open_smb(struct dcerpc_connection *c,
 501                               struct smbcli_tree *tree,
 502                               const char *pipe_name)
 503 {
 504         struct composite_context *ctx = dcerpc_pipe_open_smb_send(c, tree,
 505                                                                   pipe_name);
 506         return dcerpc_pipe_open_smb_recv(ctx);
 507 }
 508
 509 /*
 510   return the SMB tree used for a dcerpc over SMB pipe
 511 */
 512 struct smbcli_tree *dcerpc_smb_tree(struct dcerpc_connection *c)
 513 {
 514         struct smb_private *smb = c->transport.private;
 515
 516         if (c->transport.transport != NCACN_NP) {
 517                 return NULL;
 518         }
 519
 520         return smb->tree;
 521 }