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 #include "../libcli/smb/smbXcli_base.h"
  32
  33 /* transport private information used by SMB2 pipe transport */
  34 struct smb2_private {
  35         struct smb2_handle handle;
  36         struct smb2_tree *tree;
  37         const char *server_name;
  38         bool dead;
  39 };
  40
  41
  42 /*
  43   tell the dcerpc layer that the transport is dead
  44 */
  45 static void pipe_dead(struct dcecli_connection *c, NTSTATUS status)
  46 {
  47         struct smb2_private *smb = (struct smb2_private *)c->transport.private_data;
  48
  49         if (smb->dead) {
  50                 return;
  51         }
  52
  53         smb->dead = true;
  54
  55         if (NT_STATUS_EQUAL(NT_STATUS_UNSUCCESSFUL, status)) {
  56                 status = NT_STATUS_UNEXPECTED_NETWORK_ERROR;
  57         }
  58
  59         if (NT_STATUS_EQUAL(NT_STATUS_OK, status)) {
  60                 status = NT_STATUS_END_OF_FILE;
  61         }
  62
  63         if (c->transport.recv_data) {
  64                 c->transport.recv_data(c, NULL, status);
  65         }
  66 }
  67
  68
  69 /*
  70    this holds the state of an in-flight call
  71 */
  72 struct smb2_read_state {
  73         struct dcecli_connection *c;
  74         DATA_BLOB data;
  75 };
  76
  77 /*
  78   called when a read request has completed
  79 */
  80 static void smb2_read_callback(struct smb2_request *req)
  81 {
  82         struct dcecli_connection *c;
  83         struct smb2_private *smb;
  84         struct smb2_read_state *state;
  85         struct smb2_read io;
  86         uint16_t frag_length;
  87         NTSTATUS status;
  88
  89         state = talloc_get_type(req->async.private_data, struct smb2_read_state);
  90         smb = talloc_get_type(state->c->transport.private_data, struct smb2_private);
  91         c = state->c;
  92
  93         status = smb2_read_recv(req, state, &io);
  94         if (NT_STATUS_IS_ERR(status)) {
  95                 talloc_free(state);
  96                 pipe_dead(c, status);
  97                 return;
  98         }
  99
 100         if (!data_blob_append(state, &state->data,
 101                                   io.out.data.data, io.out.data.length)) {
 102                 talloc_free(state);
 103                 pipe_dead(c, NT_STATUS_NO_MEMORY);
 104                 return;
 105         }
 106
 107         if (state->data.length < 16) {
 108                 DEBUG(0,("dcerpc_smb2: short packet (length %d) in read callback!\n",
 109                          (int)state->data.length));
 110                 talloc_free(state);
 111                 pipe_dead(c, NT_STATUS_INFO_LENGTH_MISMATCH);
 112                 return;
 113         }
 114
 115         frag_length = dcerpc_get_frag_length(&state->data);
 116
 117         if (frag_length <= state->data.length) {
 118                 DATA_BLOB data = state->data;
 119                 talloc_steal(c, data.data);
 120                 talloc_free(state);
 121                 c->transport.recv_data(c, &data, NT_STATUS_OK);
 122                 return;
 123         }
 124
 125         /* initiate another read request, as we only got part of a fragment */
 126         ZERO_STRUCT(io);
 127         io.in.file.handle = smb->handle;
 128         io.in.length = MIN(state->c->srv_max_xmit_frag,
 129                            frag_length - state->data.length);
 130         if (io.in.length < 16) {
 131                 io.in.length = 16;
 132         }
 133
 134         req = smb2_read_send(smb->tree, &io);
 135         if (req == NULL) {
 136                 talloc_free(state);
 137                 pipe_dead(c, NT_STATUS_NO_MEMORY);
 138                 return;
 139         }
 140
 141         req->async.fn = smb2_read_callback;
 142         req->async.private_data = state;
 143 }
 144
 145
 146 /*
 147   trigger a read request from the server, possibly with some initial
 148   data in the read buffer
 149 */
 150 static NTSTATUS send_read_request_continue(struct dcecli_connection *c, DATA_BLOB *blob)
 151 {
 152         struct smb2_private *smb = (struct smb2_private *)c->transport.private_data;
 153         struct smb2_read io;
 154         struct smb2_read_state *state;
 155         struct smb2_request *req;
 156
 157         state = talloc(c, struct smb2_read_state);
 158         if (state == NULL) {
 159                 return NT_STATUS_NO_MEMORY;
 160         }
 161
 162         state->c = c;
 163         if (blob == NULL) {
 164                 state->data = data_blob(NULL, 0);
 165         } else {
 166                 state->data = *blob;
 167                 talloc_steal(state, state->data.data);
 168         }
 169
 170         ZERO_STRUCT(io);
 171         io.in.file.handle = smb->handle;
 172
 173         if (state->data.length >= 16) {
 174                 uint16_t frag_length = dcerpc_get_frag_length(&state->data);
 175                 io.in.length = frag_length - state->data.length;
 176         } else {
 177                 io.in.length = 0x2000;
 178         }
 179
 180         req = smb2_read_send(smb->tree, &io);
 181         if (req == NULL) {
 182                 return NT_STATUS_NO_MEMORY;
 183         }
 184
 185         req->async.fn = smb2_read_callback;
 186         req->async.private_data = state;
 187
 188         return NT_STATUS_OK;
 189 }
 190
 191
 192 /*
 193   trigger a read request from the server
 194 */
 195 static NTSTATUS send_read_request(struct dcecli_connection *c)
 196 {
 197         struct smb2_private *smb = (struct smb2_private *)c->transport.private_data;
 198
 199         if (smb->dead) {
 200                 return NT_STATUS_CONNECTION_DISCONNECTED;
 201         }
 202
 203         return send_read_request_continue(c, NULL);
 204 }
 205
 206 /*
 207    this holds the state of an in-flight trans call
 208 */
 209 struct smb2_trans_state {
 210         struct dcecli_connection *c;
 211 };
 212
 213 /*
 214   called when a trans request has completed
 215 */
 216 static void smb2_trans_callback(struct smb2_request *req)
 217 {
 218         struct smb2_trans_state *state = talloc_get_type(req->async.private_data,
 219                                                         struct smb2_trans_state);
 220         struct dcecli_connection *c = state->c;
 221         NTSTATUS status;
 222         struct smb2_ioctl io;
 223
 224         status = smb2_ioctl_recv(req, state, &io);
 225         if (NT_STATUS_IS_ERR(status)) {
 226                 pipe_dead(c, status);
 227                 return;
 228         }
 229
 230         if (!NT_STATUS_EQUAL(status, STATUS_BUFFER_OVERFLOW)) {
 231                 DATA_BLOB data = io.out.out;
 232                 talloc_steal(c, data.data);
 233                 talloc_free(state);
 234                 c->transport.recv_data(c, &data, NT_STATUS_OK);
 235                 return;
 236         }
 237
 238         /* there is more to receive - setup a read */
 239         send_read_request_continue(c, &io.out.out);
 240         talloc_free(state);
 241 }
 242
 243 /*
 244   send a SMBtrans style request, using a named pipe read_write fsctl
 245 */
 246 static NTSTATUS smb2_send_trans_request(struct dcecli_connection *c, DATA_BLOB *blob)
 247 {
 248         struct smb2_private *smb = talloc_get_type(c->transport.private_data,
 249                                                    struct smb2_private);
 250         struct smb2_ioctl io;
 251         struct smb2_trans_state *state;
 252         struct smb2_request *req;
 253
 254         state = talloc(smb, struct smb2_trans_state);
 255         if (state == NULL) {
 256                 return NT_STATUS_NO_MEMORY;
 257         }
 258
 259         state->c = c;
 260
 261         ZERO_STRUCT(io);
 262         io.in.file.handle       = smb->handle;
 263         io.in.function          = FSCTL_NAMED_PIPE_READ_WRITE;
 264         io.in.max_response_size = 0x2000;
 265         io.in.flags             = 1;
 266         io.in.out               = *blob;
 267
 268         req = smb2_ioctl_send(smb->tree, &io);
 269         if (req == NULL) {
 270                 talloc_free(state);
 271                 return NT_STATUS_NO_MEMORY;
 272         }
 273
 274         req->async.fn = smb2_trans_callback;
 275         req->async.private_data = state;
 276
 277         talloc_steal(state, req);
 278
 279         return NT_STATUS_OK;
 280 }
 281
 282 /*
 283   called when a write request has completed
 284 */
 285 static void smb2_write_callback(struct smb2_request *req)
 286 {
 287         struct dcecli_connection *c = (struct dcecli_connection *)req->async.private_data;
 288         struct smb2_write io;
 289         NTSTATUS status;
 290
 291         ZERO_STRUCT(io);
 292
 293         status = smb2_write_recv(req, &io);
 294         if (!NT_STATUS_IS_OK(status)) {
 295                 DEBUG(0,("dcerpc_smb2: write callback error: %s\n",
 296                          nt_errstr(status)));
 297                 pipe_dead(c, status);
 298         }
 299 }
 300
 301 /*
 302    send a packet to the server
 303 */
 304 static NTSTATUS smb2_send_request(struct dcecli_connection *c, DATA_BLOB *blob,
 305                                   bool trigger_read)
 306 {
 307         struct smb2_private *smb = (struct smb2_private *)c->transport.private_data;
 308         struct smb2_write io;
 309         struct smb2_request *req;
 310
 311         if (smb->dead) {
 312                 return NT_STATUS_CONNECTION_DISCONNECTED;
 313         }
 314
 315         if (trigger_read) {
 316                 return smb2_send_trans_request(c, blob);
 317         }
 318
 319         ZERO_STRUCT(io);
 320         io.in.file.handle       = smb->handle;
 321         io.in.data              = *blob;
 322
 323         req = smb2_write_send(smb->tree, &io);
 324         if (req == NULL) {
 325                 return NT_STATUS_NO_MEMORY;
 326         }
 327
 328         req->async.fn = smb2_write_callback;
 329         req->async.private_data = c;
 330
 331         return NT_STATUS_OK;
 332 }
 333
 334 static void free_request(struct smb2_request *req)
 335 {
 336         talloc_free(req);
 337 }
 338
 339 /*
 340    shutdown SMB pipe connection
 341 */
 342 static NTSTATUS smb2_shutdown_pipe(struct dcecli_connection *c, NTSTATUS status)
 343 {
 344         struct smb2_private *smb = (struct smb2_private *)c->transport.private_data;
 345         struct smb2_close io;
 346         struct smb2_request *req;
 347
 348         /* maybe we're still starting up */
 349         if (!smb) return status;
 350
 351         ZERO_STRUCT(io);
 352         io.in.file.handle = smb->handle;
 353         req = smb2_close_send(smb->tree, &io);
 354         if (req != NULL) {
 355                 /* we don't care if this fails, so just free it if it succeeds */
 356                 req->async.fn = free_request;
 357         }
 358
 359         talloc_free(smb);
 360
 361         return status;
 362 }
 363
 364 /*
 365   return SMB server name
 366 */
 367 static const char *smb2_peer_name(struct dcecli_connection *c)
 368 {
 369         struct smb2_private *smb = talloc_get_type(c->transport.private_data,
 370                                                    struct smb2_private);
 371         return smb->server_name;
 372 }
 373
 374 /*
 375   return remote name we make the actual connection (good for kerberos)
 376 */
 377 static const char *smb2_target_hostname(struct dcecli_connection *c)
 378 {
 379         struct smb2_private *smb = talloc_get_type(c->transport.private_data,
 380                                                    struct smb2_private);
 381         return smbXcli_conn_remote_name(smb->tree->session->transport->conn);
 382 }
 383
 384 /*
 385   fetch the user session key
 386 */
 387 static NTSTATUS smb2_session_key(struct dcecli_connection *c, DATA_BLOB *session_key)
 388 {
 389         struct smb2_private *smb = talloc_get_type(c->transport.private_data,
 390                                                    struct smb2_private);
 391         *session_key = smb->tree->session->session_key;
 392         if (session_key->data == NULL) {
 393                 return NT_STATUS_NO_USER_SESSION_KEY;
 394         }
 395         return NT_STATUS_OK;
 396 }
 397
 398 struct pipe_open_smb2_state {
 399         struct dcecli_connection *c;
 400         struct composite_context *ctx;
 401 };
 402
 403 static void pipe_open_recv(struct smb2_request *req);
 404
 405 struct composite_context *dcerpc_pipe_open_smb2_send(struct dcerpc_pipe *p,
 406                                                      struct smb2_tree *tree,
 407                                                      const char *pipe_name)
 408 {
 409         struct composite_context *ctx;
 410         struct pipe_open_smb2_state *state;
 411         struct smb2_create io;
 412         struct smb2_request *req;
 413         struct dcecli_connection *c = p->conn;
 414
 415         ctx = composite_create(c, c->event_ctx);
 416         if (ctx == NULL) return NULL;
 417
 418         state = talloc(ctx, struct pipe_open_smb2_state);
 419         if (composite_nomem(state, ctx)) return ctx;
 420         ctx->private_data = state;
 421
 422         state->c = c;
 423         state->ctx = ctx;
 424
 425         ZERO_STRUCT(io);
 426         io.in.desired_access =
 427                 SEC_STD_READ_CONTROL |
 428                 SEC_FILE_READ_ATTRIBUTE |
 429                 SEC_FILE_WRITE_ATTRIBUTE |
 430                 SEC_STD_SYNCHRONIZE |
 431                 SEC_FILE_READ_EA |
 432                 SEC_FILE_WRITE_EA |
 433                 SEC_FILE_READ_DATA |
 434                 SEC_FILE_WRITE_DATA |
 435                 SEC_FILE_APPEND_DATA;
 436         io.in.share_access =
 437                 NTCREATEX_SHARE_ACCESS_READ |
 438                 NTCREATEX_SHARE_ACCESS_WRITE;
 439         io.in.create_disposition = NTCREATEX_DISP_OPEN;
 440         io.in.create_options   =
 441                 NTCREATEX_OPTIONS_NON_DIRECTORY_FILE |
 442                 NTCREATEX_OPTIONS_NO_RECALL;
 443         io.in.impersonation_level = NTCREATEX_IMPERSONATION_IMPERSONATION;
 444
 445         if ((strncasecmp(pipe_name, "/pipe/", 6) == 0) ||
 446             (strncasecmp(pipe_name, "\\pipe\\", 6) == 0)) {
 447                 pipe_name += 6;
 448         }
 449         io.in.fname = pipe_name;
 450
 451         req = smb2_create_send(tree, &io);
 452         composite_continue_smb2(ctx, req, pipe_open_recv, state);
 453         return ctx;
 454 }
 455
 456 static void pipe_open_recv(struct smb2_request *req)
 457 {
 458         struct pipe_open_smb2_state *state =
 459                 talloc_get_type(req->async.private_data,
 460                                 struct pipe_open_smb2_state);
 461         struct composite_context *ctx = state->ctx;
 462         struct dcecli_connection *c = state->c;
 463         struct smb2_tree *tree = req->tree;
 464         struct smb2_private *smb;
 465         struct smb2_create io;
 466
 467         ctx->status = smb2_create_recv(req, state, &io);
 468         if (!composite_is_ok(ctx)) return;
 469
 470         /*
 471           fill in the transport methods
 472         */
 473         c->transport.transport = NCACN_NP;
 474         c->transport.private_data = NULL;
 475         c->transport.shutdown_pipe = smb2_shutdown_pipe;
 476         c->transport.peer_name = smb2_peer_name;
 477         c->transport.target_hostname = smb2_target_hostname;
 478
 479         c->transport.send_request = smb2_send_request;
 480         c->transport.send_read = send_read_request;
 481         c->transport.recv_data = NULL;
 482
 483         /* Over-ride the default session key with the SMB session key */
 484         c->security_state.session_key = smb2_session_key;
 485
 486         smb = talloc(c, struct smb2_private);
 487         if (composite_nomem(smb, ctx)) return;
 488
 489         smb->handle     = io.out.file.handle;
 490         smb->tree       = talloc_reference(smb, tree);
 491         smb->server_name= strupper_talloc(smb,
 492                                           smbXcli_conn_remote_name(tree->session->transport->conn));
 493         if (composite_nomem(smb->server_name, ctx)) return;
 494         smb->dead       = false;
 495
 496         c->transport.private_data = smb;
 497
 498         composite_done(ctx);
 499 }
 500
 501 NTSTATUS dcerpc_pipe_open_smb2_recv(struct composite_context *c)
 502 {
 503         NTSTATUS status = composite_wait(c);
 504         talloc_free(c);
 505         return status;
 506 }
 507
 508 NTSTATUS dcerpc_pipe_open_smb2(struct dcerpc_pipe *p,
 509                                struct smb2_tree *tree,
 510                                const char *pipe_name)
 511 {
 512         struct composite_context *ctx = dcerpc_pipe_open_smb2_send(p, tree, pipe_name);
 513         return dcerpc_pipe_open_smb2_recv(ctx);
 514 }
 515
 516 /*
 517   return the SMB2 tree used for a dcerpc over SMB2 pipe
 518 */
 519 struct smb2_tree *dcerpc_smb2_tree(struct dcecli_connection *c)
 520 {
 521         struct smb2_private *smb = talloc_get_type(c->transport.private_data,
 522                                                    struct smb2_private);
 523         return smb->tree;
 524 }