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/raw/ioctl.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 dcerpc_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 dcerpc_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 smb2_private *smb;
  82         struct smb2_read_state *state;
  83         struct smb2_read io;
  84         uint16_t frag_length;
  85         NTSTATUS status;
  86
  87         state = talloc_get_type(req->async.private_data, struct smb2_read_state);
  88         smb = talloc_get_type(state->c->transport.private_data, struct smb2_private);
  89
  90         status = smb2_read_recv(req, state, &io);
  91         if (NT_STATUS_IS_ERR(status)) {
  92                 pipe_dead(state->c, status);
  93                 talloc_free(state);
  94                 return;
  95         }
  96
  97         if (!data_blob_append(state, &state->data,
  98                                   io.out.data.data, io.out.data.length)) {
  99                 pipe_dead(state->c, NT_STATUS_NO_MEMORY);
 100                 talloc_free(state);
 101                 return;
 102         }
 103
 104         if (state->data.length < 16) {
 105                 DEBUG(0,("dcerpc_smb2: short packet (length %d) in read callback!\n",
 106                          (int)state->data.length));
 107                 pipe_dead(state->c, NT_STATUS_INFO_LENGTH_MISMATCH);
 108                 talloc_free(state);
 109                 return;
 110         }
 111
 112         frag_length = dcerpc_get_frag_length(&state->data);
 113
 114         if (frag_length <= state->data.length) {
 115                 DATA_BLOB data = state->data;
 116                 struct dcerpc_connection *c = state->c;
 117                 talloc_steal(c, data.data);
 118                 talloc_free(state);
 119                 c->transport.recv_data(c, &data, NT_STATUS_OK);
 120                 return;
 121         }
 122
 123         /* initiate another read request, as we only got part of a fragment */
 124         ZERO_STRUCT(io);
 125         io.in.file.handle = smb->handle;
 126         io.in.length = MIN(state->c->srv_max_xmit_frag,
 127                            frag_length - state->data.length);
 128         if (io.in.length < 16) {
 129                 io.in.length = 16;
 130         }
 131
 132         req = smb2_read_send(smb->tree, &io);
 133         if (req == NULL) {
 134                 pipe_dead(state->c, NT_STATUS_NO_MEMORY);
 135                 talloc_free(state);
 136                 return;
 137         }
 138
 139         req->async.fn = smb2_read_callback;
 140         req->async.private_data = state;
 141 }
 142
 143
 144 /*
 145   trigger a read request from the server, possibly with some initial
 146   data in the read buffer
 147 */
 148 static NTSTATUS send_read_request_continue(struct dcerpc_connection *c, DATA_BLOB *blob)
 149 {
 150         struct smb2_private *smb = (struct smb2_private *)c->transport.private_data;
 151         struct smb2_read io;
 152         struct smb2_read_state *state;
 153         struct smb2_request *req;
 154
 155         state = talloc(smb, struct smb2_read_state);
 156         if (state == NULL) {
 157                 return NT_STATUS_NO_MEMORY;
 158         }
 159
 160         state->c = c;
 161         if (blob == NULL) {
 162                 state->data = data_blob(NULL, 0);
 163         } else {
 164                 state->data = *blob;
 165                 talloc_steal(state, state->data.data);
 166         }
 167
 168         ZERO_STRUCT(io);
 169         io.in.file.handle = smb->handle;
 170
 171         if (state->data.length >= 16) {
 172                 uint16_t frag_length = dcerpc_get_frag_length(&state->data);
 173                 io.in.length = frag_length - state->data.length;
 174         } else {
 175                 io.in.length = 0x2000;
 176         }
 177
 178         req = smb2_read_send(smb->tree, &io);
 179         if (req == NULL) {
 180                 return NT_STATUS_NO_MEMORY;
 181         }
 182
 183         req->async.fn = smb2_read_callback;
 184         req->async.private_data = state;
 185
 186         return NT_STATUS_OK;
 187 }
 188
 189
 190 /*
 191   trigger a read request from the server
 192 */
 193 static NTSTATUS send_read_request(struct dcerpc_connection *c)
 194 {
 195         struct smb2_private *smb = (struct smb2_private *)c->transport.private_data;
 196
 197         if (smb->dead) {
 198                 return NT_STATUS_CONNECTION_DISCONNECTED;
 199         }
 200
 201         return send_read_request_continue(c, NULL);
 202 }
 203
 204 /*
 205    this holds the state of an in-flight trans call
 206 */
 207 struct smb2_trans_state {
 208         struct dcerpc_connection *c;
 209 };
 210
 211 /*
 212   called when a trans request has completed
 213 */
 214 static void smb2_trans_callback(struct smb2_request *req)
 215 {
 216         struct smb2_trans_state *state = talloc_get_type(req->async.private_data,
 217                                                         struct smb2_trans_state);
 218         struct dcerpc_connection *c = state->c;
 219         NTSTATUS status;
 220         struct smb2_ioctl io;
 221
 222         status = smb2_ioctl_recv(req, state, &io);
 223         if (NT_STATUS_IS_ERR(status)) {
 224                 pipe_dead(c, status);
 225                 return;
 226         }
 227
 228         if (!NT_STATUS_EQUAL(status, STATUS_BUFFER_OVERFLOW)) {
 229                 DATA_BLOB data = io.out.out;
 230                 talloc_steal(c, data.data);
 231                 talloc_free(state);
 232                 c->transport.recv_data(c, &data, NT_STATUS_OK);
 233                 return;
 234         }
 235
 236         /* there is more to receive - setup a read */
 237         send_read_request_continue(c, &io.out.out);
 238         talloc_free(state);
 239 }
 240
 241 /*
 242   send a SMBtrans style request, using a named pipe read_write fsctl
 243 */
 244 static NTSTATUS smb2_send_trans_request(struct dcerpc_connection *c, DATA_BLOB *blob)
 245 {
 246         struct smb2_private *smb = talloc_get_type(c->transport.private_data,
 247                                                    struct smb2_private);
 248         struct smb2_ioctl io;
 249         struct smb2_trans_state *state;
 250         struct smb2_request *req;
 251
 252         state = talloc(smb, struct smb2_trans_state);
 253         if (state == NULL) {
 254                 return NT_STATUS_NO_MEMORY;
 255         }
 256
 257         state->c = c;
 258
 259         ZERO_STRUCT(io);
 260         io.in.file.handle       = smb->handle;
 261         io.in.function          = FSCTL_NAMED_PIPE_READ_WRITE;
 262         io.in.max_response_size = 0x2000;
 263         io.in.flags             = 1;
 264         io.in.out               = *blob;
 265
 266         req = smb2_ioctl_send(smb->tree, &io);
 267         if (req == NULL) {
 268                 talloc_free(state);
 269                 return NT_STATUS_NO_MEMORY;
 270         }
 271
 272         req->async.fn = smb2_trans_callback;
 273         req->async.private_data = state;
 274
 275         talloc_steal(state, req);
 276
 277         return NT_STATUS_OK;
 278 }
 279
 280 /*
 281   called when a write request has completed
 282 */
 283 static void smb2_write_callback(struct smb2_request *req)
 284 {
 285         struct dcerpc_connection *c = (struct dcerpc_connection *)req->async.private_data;
 286
 287         if (!NT_STATUS_IS_OK(req->status)) {
 288                 DEBUG(0,("dcerpc_smb2: write callback error\n"));
 289                 pipe_dead(c, req->status);
 290         }
 291
 292         smb2_request_destroy(req);
 293 }
 294
 295 /*
 296    send a packet to the server
 297 */
 298 static NTSTATUS smb2_send_request(struct dcerpc_connection *c, DATA_BLOB *blob,
 299                                   bool trigger_read)
 300 {
 301         struct smb2_private *smb = (struct smb2_private *)c->transport.private_data;
 302         struct smb2_write io;
 303         struct smb2_request *req;
 304
 305         if (smb->dead) {
 306                 return NT_STATUS_CONNECTION_DISCONNECTED;
 307         }
 308
 309         if (trigger_read) {
 310                 return smb2_send_trans_request(c, blob);
 311         }
 312
 313         ZERO_STRUCT(io);
 314         io.in.file.handle       = smb->handle;
 315         io.in.data              = *blob;
 316
 317         req = smb2_write_send(smb->tree, &io);
 318         if (req == NULL) {
 319                 return NT_STATUS_NO_MEMORY;
 320         }
 321
 322         req->async.fn = smb2_write_callback;
 323         req->async.private_data = c;
 324
 325         return NT_STATUS_OK;
 326 }
 327
 328 static void free_request(struct smb2_request *req)
 329 {
 330         talloc_free(req);
 331 }
 332
 333 /*
 334    shutdown SMB pipe connection
 335 */
 336 static NTSTATUS smb2_shutdown_pipe(struct dcerpc_connection *c, NTSTATUS status)
 337 {
 338         struct smb2_private *smb = (struct smb2_private *)c->transport.private_data;
 339         struct smb2_close io;
 340         struct smb2_request *req;
 341
 342         /* maybe we're still starting up */
 343         if (!smb) return status;
 344
 345         ZERO_STRUCT(io);
 346         io.in.file.handle = smb->handle;
 347         req = smb2_close_send(smb->tree, &io);
 348         if (req != NULL) {
 349                 /* we don't care if this fails, so just free it if it succeeds */
 350                 req->async.fn = free_request;
 351         }
 352
 353         talloc_free(smb);
 354
 355         return status;
 356 }
 357
 358 /*
 359   return SMB server name
 360 */
 361 static const char *smb2_peer_name(struct dcerpc_connection *c)
 362 {
 363         struct smb2_private *smb = talloc_get_type(c->transport.private_data,
 364                                                    struct smb2_private);
 365         return smb->server_name;
 366 }
 367
 368 /*
 369   return remote name we make the actual connection (good for kerberos)
 370 */
 371 static const char *smb2_target_hostname(struct dcerpc_connection *c)
 372 {
 373         struct smb2_private *smb = talloc_get_type(c->transport.private_data,
 374                                                    struct smb2_private);
 375         return smb->tree->session->transport->socket->hostname;
 376 }
 377
 378 /*
 379   fetch the user session key
 380 */
 381 static NTSTATUS smb2_session_key(struct dcerpc_connection *c, DATA_BLOB *session_key)
 382 {
 383         struct smb2_private *smb = talloc_get_type(c->transport.private_data,
 384                                                    struct smb2_private);
 385         *session_key = smb->tree->session->session_key;
 386         if (session_key->data == NULL) {
 387                 return NT_STATUS_NO_USER_SESSION_KEY;
 388         }
 389         return NT_STATUS_OK;
 390 }
 391
 392 struct pipe_open_smb2_state {
 393         struct dcerpc_connection *c;
 394         struct composite_context *ctx;
 395 };
 396
 397 static void pipe_open_recv(struct smb2_request *req);
 398
 399 struct composite_context *dcerpc_pipe_open_smb2_send(struct dcerpc_pipe *p,
 400                                                      struct smb2_tree *tree,
 401                                                      const char *pipe_name)
 402 {
 403         struct composite_context *ctx;
 404         struct pipe_open_smb2_state *state;
 405         struct smb2_create io;
 406         struct smb2_request *req;
 407         struct dcerpc_connection *c = p->conn;
 408
 409         ctx = composite_create(c, c->event_ctx);
 410         if (ctx == NULL) return NULL;
 411
 412         state = talloc(ctx, struct pipe_open_smb2_state);
 413         if (composite_nomem(state, ctx)) return ctx;
 414         ctx->private_data = state;
 415
 416         state->c = c;
 417         state->ctx = ctx;
 418
 419         ZERO_STRUCT(io);
 420         io.in.desired_access =
 421                 SEC_STD_READ_CONTROL |
 422                 SEC_FILE_READ_ATTRIBUTE |
 423                 SEC_FILE_WRITE_ATTRIBUTE |
 424                 SEC_STD_SYNCHRONIZE |
 425                 SEC_FILE_READ_EA |
 426                 SEC_FILE_WRITE_EA |
 427                 SEC_FILE_READ_DATA |
 428                 SEC_FILE_WRITE_DATA |
 429                 SEC_FILE_APPEND_DATA;
 430         io.in.share_access =
 431                 NTCREATEX_SHARE_ACCESS_READ |
 432                 NTCREATEX_SHARE_ACCESS_WRITE;
 433         io.in.create_disposition = NTCREATEX_DISP_OPEN;
 434         io.in.create_options   =
 435                 NTCREATEX_OPTIONS_NON_DIRECTORY_FILE |
 436                 NTCREATEX_OPTIONS_NO_RECALL;
 437         io.in.impersonation_level = NTCREATEX_IMPERSONATION_IMPERSONATION;
 438
 439         if ((strncasecmp(pipe_name, "/pipe/", 6) == 0) ||
 440             (strncasecmp(pipe_name, "\\pipe\\", 6) == 0)) {
 441                 pipe_name += 6;
 442         }
 443         io.in.fname = pipe_name;
 444
 445         req = smb2_create_send(tree, &io);
 446         composite_continue_smb2(ctx, req, pipe_open_recv, state);
 447         return ctx;
 448 }
 449
 450 static void pipe_open_recv(struct smb2_request *req)
 451 {
 452         struct pipe_open_smb2_state *state =
 453                 talloc_get_type(req->async.private_data,
 454                                 struct pipe_open_smb2_state);
 455         struct composite_context *ctx = state->ctx;
 456         struct dcerpc_connection *c = state->c;
 457         struct smb2_tree *tree = req->tree;
 458         struct smb2_private *smb;
 459         struct smb2_create io;
 460
 461         ctx->status = smb2_create_recv(req, state, &io);
 462         if (!composite_is_ok(ctx)) return;
 463
 464         /*
 465           fill in the transport methods
 466         */
 467         c->transport.transport = NCACN_NP;
 468         c->transport.private_data = NULL;
 469         c->transport.shutdown_pipe = smb2_shutdown_pipe;
 470         c->transport.peer_name = smb2_peer_name;
 471         c->transport.target_hostname = smb2_target_hostname;
 472
 473         c->transport.send_request = smb2_send_request;
 474         c->transport.send_read = send_read_request;
 475         c->transport.recv_data = NULL;
 476
 477         /* Over-ride the default session key with the SMB session key */
 478         c->security_state.session_key = smb2_session_key;
 479
 480         smb = talloc(c, struct smb2_private);
 481         if (composite_nomem(smb, ctx)) return;
 482
 483         smb->handle     = io.out.file.handle;
 484         smb->tree       = talloc_reference(smb, tree);
 485         smb->server_name= strupper_talloc(smb,
 486                                           tree->session->transport->socket->hostname);
 487         if (composite_nomem(smb->server_name, ctx)) return;
 488         smb->dead       = false;
 489
 490         c->transport.private_data = smb;
 491
 492         composite_done(ctx);
 493 }
 494
 495 NTSTATUS dcerpc_pipe_open_smb2_recv(struct composite_context *c)
 496 {
 497         NTSTATUS status = composite_wait(c);
 498         talloc_free(c);
 499         return status;
 500 }
 501
 502 NTSTATUS dcerpc_pipe_open_smb2(struct dcerpc_pipe *p,
 503                                struct smb2_tree *tree,
 504                                const char *pipe_name)
 505 {
 506         struct composite_context *ctx = dcerpc_pipe_open_smb2_send(p, tree, pipe_name);
 507         return dcerpc_pipe_open_smb2_recv(ctx);
 508 }
 509
 510 /*
 511   return the SMB2 tree used for a dcerpc over SMB2 pipe
 512 */
 513 struct smb2_tree *dcerpc_smb2_tree(struct dcerpc_connection *c)
 514 {
 515         struct smb2_private *smb = talloc_get_type(c->transport.private_data,
 516                                                    struct smb2_private);
 517         return smb->tree;
 518 }