source4/librpc/rpc/dcerpc_smb2.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    dcerpc over SMB2 transport
   5
   6    Copyright (C) Andrew Tridgell 2005
   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 "libcli/raw/libcliraw.h"
  24 #include "libcli/composite/composite.h"
  25 #include "libcli/smb2/smb2.h"
  26 #include "libcli/smb2/smb2_calls.h"
  27 #include "../libcli/smb/smb_constants.h"
  28 #include "librpc/rpc/dcerpc.h"
  29 #include "librpc/rpc/dcerpc_proto.h"
  30 #include "librpc/rpc/rpc_common.h"
  31
  32 /* transport private information used by SMB2 pipe transport */
  33 struct smb2_private {
  34         struct smb2_handle handle;
  35         struct smb2_tree *tree;
  36         const char *server_name;
  37         bool dead;
  38 };
  39
  40
  41 /*
  42   tell the dcerpc layer that the transport is dead
  43 */
  44 static void pipe_dead(struct dcecli_connection *c, NTSTATUS status)
  45 {
  46         struct smb2_private *smb = (struct smb2_private *)c->transport.private_data;
  47
  48         if (smb->dead) {
  49                 return;
  50         }
  51
  52         smb->dead = true;
  53
  54         if (NT_STATUS_EQUAL(NT_STATUS_UNSUCCESSFUL, status)) {
  55                 status = NT_STATUS_UNEXPECTED_NETWORK_ERROR;
  56         }
  57
  58         if (NT_STATUS_EQUAL(NT_STATUS_OK, status)) {
  59                 status = NT_STATUS_END_OF_FILE;
  60         }
  61
  62         if (c->transport.recv_data) {
  63                 c->transport.recv_data(c, NULL, status);
  64         }
  65 }
  66
  67
  68 /*
  69    this holds the state of an in-flight call
  70 */
  71 struct smb2_read_state {
  72         struct dcecli_connection *c;
  73         DATA_BLOB data;
  74 };
  75
  76 /*
  77   called when a read request has completed
  78 */
  79 static void smb2_read_callback(struct smb2_request *req)
  80 {
  81         struct dcecli_connection *c;
  82         struct smb2_private *smb;
  83         struct smb2_read_state *state;
  84         struct smb2_read io;
  85         uint16_t frag_length;
  86         NTSTATUS status;
  87
  88         state = talloc_get_type(req->async.private_data, struct smb2_read_state);
  89         smb = talloc_get_type(state->c->transport.private_data, struct smb2_private);
  90         c = state->c;
  91
  92         status = smb2_read_recv(req, state, &io);
  93         if (NT_STATUS_IS_ERR(status)) {
  94                 talloc_free(state);
  95                 pipe_dead(c, status);
  96                 return;
  97         }
  98
  99         if (!data_blob_append(state, &state->data,
 100                                   io.out.data.data, io.out.data.length)) {
 101                 talloc_free(state);
 102                 pipe_dead(c, NT_STATUS_NO_MEMORY);
 103                 return;
 104         }
 105
 106         if (state->data.length < 16) {
 107                 DEBUG(0,("dcerpc_smb2: short packet (length %d) in read callback!\n",
 108                          (int)state->data.length));
 109                 talloc_free(state);
 110                 pipe_dead(c, NT_STATUS_INFO_LENGTH_MISMATCH);
 111                 return;
 112         }
 113
 114         frag_length = dcerpc_get_frag_length(&state->data);
 115
 116         if (frag_length <= state->data.length) {
 117                 DATA_BLOB data = state->data;
 118                 talloc_steal(c, data.data);
 119                 talloc_free(state);
 120                 c->transport.recv_data(c, &data, NT_STATUS_OK);
 121                 return;
 122         }
 123
 124         /* initiate another read request, as we only got part of a fragment */
 125         ZERO_STRUCT(io);
 126         io.in.file.handle = smb->handle;
 127         io.in.length = MIN(state->c->srv_max_xmit_frag,
 128                            frag_length - state->data.length);
 129         if (io.in.length < 16) {
 130                 io.in.length = 16;
 131         }
 132
 133         req = smb2_read_send(smb->tree, &io);
 134         if (req == NULL) {
 135                 talloc_free(state);
 136                 pipe_dead(c, NT_STATUS_NO_MEMORY);
 137                 return;
 138         }
 139
 140         req->async.fn = smb2_read_callback;
 141         req->async.private_data = state;
 142 }
 143
 144
 145 /*
 146   trigger a read request from the server, possibly with some initial
 147   data in the read buffer
 148 */
 149 static NTSTATUS send_read_request_continue(struct dcecli_connection *c, DATA_BLOB *blob)
 150 {
 151         struct smb2_private *smb = (struct smb2_private *)c->transport.private_data;
 152         struct smb2_read io;
 153         struct smb2_read_state *state;
 154         struct smb2_request *req;
 155
 156         state = talloc(c, struct smb2_read_state);
 157         if (state == NULL) {
 158                 return NT_STATUS_NO_MEMORY;
 159         }
 160
 161         state->c = c;
 162         if (blob == NULL) {
 163                 state->data = data_blob(NULL, 0);
 164         } else {
 165                 state->data = *blob;
 166                 talloc_steal(state, state->data.data);
 167         }
 168
 169         ZERO_STRUCT(io);
 170         io.in.file.handle = smb->handle;
 171
 172         if (state->data.length >= 16) {
 173                 uint16_t frag_length = dcerpc_get_frag_length(&state->data);
 174                 io.in.length = frag_length - state->data.length;
 175         } else {
 176                 io.in.length = 0x2000;
 177         }
 178
 179         req = smb2_read_send(smb->tree, &io);
 180         if (req == NULL) {
 181                 return NT_STATUS_NO_MEMORY;
 182         }
 183
 184         req->async.fn = smb2_read_callback;
 185         req->async.private_data = state;
 186
 187         return NT_STATUS_OK;
 188 }
 189
 190
 191 /*
 192   trigger a read request from the server
 193 */
 194 static NTSTATUS send_read_request(struct dcecli_connection *c)
 195 {
 196         struct smb2_private *smb = (struct smb2_private *)c->transport.private_data;
 197
 198         if (smb->dead) {
 199                 return NT_STATUS_CONNECTION_DISCONNECTED;
 200         }
 201
 202         return send_read_request_continue(c, NULL);
 203 }
 204
 205 /*
 206    this holds the state of an in-flight trans call
 207 */
 208 struct smb2_trans_state {
 209         struct dcecli_connection *c;
 210 };
 211
 212 /*
 213   called when a trans request has completed
 214 */
 215 static void smb2_trans_callback(struct smb2_request *req)
 216 {
 217         struct smb2_trans_state *state = talloc_get_type(req->async.private_data,
 218                                                         struct smb2_trans_state);
 219         struct dcecli_connection *c = state->c;
 220         NTSTATUS status;
 221         struct smb2_ioctl io;
 222
 223         status = smb2_ioctl_recv(req, state, &io);
 224         if (NT_STATUS_IS_ERR(status)) {
 225                 pipe_dead(c, status);
 226                 return;
 227         }
 228
 229         if (!NT_STATUS_EQUAL(status, STATUS_BUFFER_OVERFLOW)) {
 230                 DATA_BLOB data = io.out.out;
 231                 talloc_steal(c, data.data);
 232                 talloc_free(state);
 233                 c->transport.recv_data(c, &data, NT_STATUS_OK);
 234                 return;
 235         }
 236
 237         /* there is more to receive - setup a read */
 238         send_read_request_continue(c, &io.out.out);
 239         talloc_free(state);
 240 }
 241
 242 /*
 243   send a SMBtrans style request, using a named pipe read_write fsctl
 244 */
 245 static NTSTATUS smb2_send_trans_request(struct dcecli_connection *c, DATA_BLOB *blob)
 246 {
 247         struct smb2_private *smb = talloc_get_type(c->transport.private_data,
 248                                                    struct smb2_private);
 249         struct smb2_ioctl io;
 250         struct smb2_trans_state *state;
 251         struct smb2_request *req;
 252
 253         state = talloc(smb, struct smb2_trans_state);
 254         if (state == NULL) {
 255                 return NT_STATUS_NO_MEMORY;
 256         }
 257
 258         state->c = c;
 259
 260         ZERO_STRUCT(io);
 261         io.in.file.handle       = smb->handle;
 262         io.in.function          = FSCTL_NAMED_PIPE_READ_WRITE;
 263         io.in.max_response_size = 0x2000;
 264         io.in.flags             = 1;
 265         io.in.out               = *blob;
 266
 267         req = smb2_ioctl_send(smb->tree, &io);
 268         if (req == NULL) {
 269                 talloc_free(state);
 270                 return NT_STATUS_NO_MEMORY;
 271         }
 272
 273         req->async.fn = smb2_trans_callback;
 274         req->async.private_data = state;
 275
 276         talloc_steal(state, req);
 277
 278         return NT_STATUS_OK;
 279 }
 280
 281 /*
 282   called when a write request has completed
 283 */
 284 static void smb2_write_callback(struct smb2_request *req)
 285 {
 286         struct dcecli_connection *c = (struct dcecli_connection *)req->async.private_data;
 287         struct smb2_write io;
 288         NTSTATUS status;
 289
 290         ZERO_STRUCT(io);
 291
 292         status = smb2_write_recv(req, &io);
 293         if (!NT_STATUS_IS_OK(status)) {
 294                 DEBUG(0,("dcerpc_smb2: write callback error: %s\n",
 295                          nt_errstr(status)));
 296                 pipe_dead(c, status);
 297         }
 298 }
 299
 300 /*
 301    send a packet to the server
 302 */
 303 static NTSTATUS smb2_send_request(struct dcecli_connection *c, DATA_BLOB *blob,
 304                                   bool trigger_read)
 305 {
 306         struct smb2_private *smb = (struct smb2_private *)c->transport.private_data;
 307         struct smb2_write io;
 308         struct smb2_request *req;
 309
 310         if (smb->dead) {
 311                 return NT_STATUS_CONNECTION_DISCONNECTED;
 312         }
 313
 314         if (trigger_read) {
 315                 return smb2_send_trans_request(c, blob);
 316         }
 317
 318         ZERO_STRUCT(io);
 319         io.in.file.handle       = smb->handle;
 320         io.in.data              = *blob;
 321
 322         req = smb2_write_send(smb->tree, &io);
 323         if (req == NULL) {
 324                 return NT_STATUS_NO_MEMORY;
 325         }
 326
 327         req->async.fn = smb2_write_callback;
 328         req->async.private_data = c;
 329
 330         return NT_STATUS_OK;
 331 }
 332
 333 static void free_request(struct smb2_request *req)
 334 {
 335         talloc_free(req);
 336 }
 337
 338 /*
 339    shutdown SMB pipe connection
 340 */
 341 static NTSTATUS smb2_shutdown_pipe(struct dcecli_connection *c, NTSTATUS status)
 342 {
 343         struct smb2_private *smb = (struct smb2_private *)c->transport.private_data;
 344         struct smb2_close io;
 345         struct smb2_request *req;
 346
 347         /* maybe we're still starting up */
 348         if (!smb) return status;
 349
 350         ZERO_STRUCT(io);
 351         io.in.file.handle = smb->handle;
 352         req = smb2_close_send(smb->tree, &io);
 353         if (req != NULL) {
 354                 /* we don't care if this fails, so just free it if it succeeds */
 355                 req->async.fn = free_request;
 356         }
 357
 358         talloc_free(smb);
 359
 360         return status;
 361 }
 362
 363 /*
 364   return SMB server name
 365 */
 366 static const char *smb2_peer_name(struct dcecli_connection *c)
 367 {
 368         struct smb2_private *smb = talloc_get_type(c->transport.private_data,
 369                                                    struct smb2_private);
 370         return smb->server_name;
 371 }
 372
 373 /*
 374   return remote name we make the actual connection (good for kerberos)
 375 */
 376 static const char *smb2_target_hostname(struct dcecli_connection *c)
 377 {
 378         struct smb2_private *smb = talloc_get_type(c->transport.private_data,
 379                                                    struct smb2_private);
 380         return smb->tree->session->transport->socket->hostname;
 381 }
 382
 383 /*
 384   fetch the user session key
 385 */
 386 static NTSTATUS smb2_session_key(struct dcecli_connection *c, DATA_BLOB *session_key)
 387 {
 388         struct smb2_private *smb = talloc_get_type(c->transport.private_data,
 389                                                    struct smb2_private);
 390         *session_key = smb->tree->session->session_key;
 391         if (session_key->data == NULL) {
 392                 return NT_STATUS_NO_USER_SESSION_KEY;
 393         }
 394         return NT_STATUS_OK;
 395 }
 396
 397 struct pipe_open_smb2_state {
 398         struct dcecli_connection *c;
 399         struct composite_context *ctx;
 400 };
 401
 402 static void pipe_open_recv(struct smb2_request *req);
 403
 404 struct composite_context *dcerpc_pipe_open_smb2_send(struct dcerpc_pipe *p,
 405                                                      struct smb2_tree *tree,
 406                                                      const char *pipe_name)
 407 {
 408         struct composite_context *ctx;
 409         struct pipe_open_smb2_state *state;
 410         struct smb2_create io;
 411         struct smb2_request *req;
 412         struct dcecli_connection *c = p->conn;
 413
 414         ctx = composite_create(c, c->event_ctx);
 415         if (ctx == NULL) return NULL;
 416
 417         state = talloc(ctx, struct pipe_open_smb2_state);
 418         if (composite_nomem(state, ctx)) return ctx;
 419         ctx->private_data = state;
 420
 421         state->c = c;
 422         state->ctx = ctx;
 423
 424         ZERO_STRUCT(io);
 425         io.in.desired_access =
 426                 SEC_STD_READ_CONTROL |
 427                 SEC_FILE_READ_ATTRIBUTE |
 428                 SEC_FILE_WRITE_ATTRIBUTE |
 429                 SEC_STD_SYNCHRONIZE |
 430                 SEC_FILE_READ_EA |
 431                 SEC_FILE_WRITE_EA |
 432                 SEC_FILE_READ_DATA |
 433                 SEC_FILE_WRITE_DATA |
 434                 SEC_FILE_APPEND_DATA;
 435         io.in.share_access =
 436                 NTCREATEX_SHARE_ACCESS_READ |
 437                 NTCREATEX_SHARE_ACCESS_WRITE;
 438         io.in.create_disposition = NTCREATEX_DISP_OPEN;
 439         io.in.create_options   =
 440                 NTCREATEX_OPTIONS_NON_DIRECTORY_FILE |
 441                 NTCREATEX_OPTIONS_NO_RECALL;
 442         io.in.impersonation_level = NTCREATEX_IMPERSONATION_IMPERSONATION;
 443
 444         if ((strncasecmp(pipe_name, "/pipe/", 6) == 0) ||
 445             (strncasecmp(pipe_name, "\\pipe\\", 6) == 0)) {
 446                 pipe_name += 6;
 447         }
 448         io.in.fname = pipe_name;
 449
 450         req = smb2_create_send(tree, &io);
 451         composite_continue_smb2(ctx, req, pipe_open_recv, state);
 452         return ctx;
 453 }
 454
 455 static void pipe_open_recv(struct smb2_request *req)
 456 {
 457         struct pipe_open_smb2_state *state =
 458                 talloc_get_type(req->async.private_data,
 459                                 struct pipe_open_smb2_state);
 460         struct composite_context *ctx = state->ctx;
 461         struct dcecli_connection *c = state->c;
 462         struct smb2_tree *tree = req->tree;
 463         struct smb2_private *smb;
 464         struct smb2_create io;
 465
 466         ctx->status = smb2_create_recv(req, state, &io);
 467         if (!composite_is_ok(ctx)) return;
 468
 469         /*
 470           fill in the transport methods
 471         */
 472         c->transport.transport = NCACN_NP;
 473         c->transport.private_data = NULL;
 474         c->transport.shutdown_pipe = smb2_shutdown_pipe;
 475         c->transport.peer_name = smb2_peer_name;
 476         c->transport.target_hostname = smb2_target_hostname;
 477
 478         c->transport.send_request = smb2_send_request;
 479         c->transport.send_read = send_read_request;
 480         c->transport.recv_data = NULL;
 481
 482         /* Over-ride the default session key with the SMB session key */
 483         c->security_state.session_key = smb2_session_key;
 484
 485         smb = talloc(c, struct smb2_private);
 486         if (composite_nomem(smb, ctx)) return;
 487
 488         smb->handle     = io.out.file.handle;
 489         smb->tree       = talloc_reference(smb, tree);
 490         smb->server_name= strupper_talloc(smb,
 491                                           tree->session->transport->socket->hostname);
 492         if (composite_nomem(smb->server_name, ctx)) return;
 493         smb->dead       = false;
 494
 495         c->transport.private_data = smb;
 496
 497         composite_done(ctx);
 498 }
 499
 500 NTSTATUS dcerpc_pipe_open_smb2_recv(struct composite_context *c)
 501 {
 502         NTSTATUS status = composite_wait(c);
 503         talloc_free(c);
 504         return status;
 505 }
 506
 507 NTSTATUS dcerpc_pipe_open_smb2(struct dcerpc_pipe *p,
 508                                struct smb2_tree *tree,
 509                                const char *pipe_name)
 510 {
 511         struct composite_context *ctx = dcerpc_pipe_open_smb2_send(p, tree, pipe_name);
 512         return dcerpc_pipe_open_smb2_recv(ctx);
 513 }
 514
 515 /*
 516   return the SMB2 tree used for a dcerpc over SMB2 pipe
 517 */
 518 struct smb2_tree *dcerpc_smb2_tree(struct dcecli_connection *c)
 519 {
 520         struct smb2_private *smb = talloc_get_type(c->transport.private_data,
 521                                                    struct smb2_private);
 522         return smb->tree;
 523 }