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         DATA_BLOB session_key;
  38         const char *server_name;
  39         bool dead;
  40 };
  41
  42
  43 /*
  44   tell the dcerpc layer that the transport is dead
  45 */
  46 static void pipe_dead(struct dcecli_connection *c, NTSTATUS status)
  47 {
  48         struct smb2_private *smb = (struct smb2_private *)c->transport.private_data;
  49
  50         if (smb->dead) {
  51                 return;
  52         }
  53
  54         smb->dead = true;
  55
  56         if (NT_STATUS_EQUAL(NT_STATUS_UNSUCCESSFUL, status)) {
  57                 status = NT_STATUS_UNEXPECTED_NETWORK_ERROR;
  58         }
  59
  60         if (NT_STATUS_EQUAL(NT_STATUS_OK, status)) {
  61                 status = NT_STATUS_END_OF_FILE;
  62         }
  63
  64         if (c->transport.recv_data) {
  65                 c->transport.recv_data(c, NULL, status);
  66         }
  67 }
  68
  69
  70 /*
  71    this holds the state of an in-flight call
  72 */
  73 struct smb2_read_state {
  74         struct dcecli_connection *c;
  75         DATA_BLOB data;
  76 };
  77
  78 /*
  79   called when a read request has completed
  80 */
  81 static void smb2_read_callback(struct smb2_request *req)
  82 {
  83         struct dcecli_connection *c;
  84         struct smb2_private *smb;
  85         struct smb2_read_state *state;
  86         struct smb2_read io;
  87         uint16_t frag_length;
  88         NTSTATUS status;
  89
  90         state = talloc_get_type(req->async.private_data, struct smb2_read_state);
  91         smb = talloc_get_type(state->c->transport.private_data, struct smb2_private);
  92         c = state->c;
  93
  94         status = smb2_read_recv(req, state, &io);
  95         if (NT_STATUS_IS_ERR(status)) {
  96                 talloc_free(state);
  97                 pipe_dead(c, status);
  98                 return;
  99         }
 100
 101         if (!data_blob_append(state, &state->data,
 102                                   io.out.data.data, io.out.data.length)) {
 103                 talloc_free(state);
 104                 pipe_dead(c, NT_STATUS_NO_MEMORY);
 105                 return;
 106         }
 107
 108         if (state->data.length < 16) {
 109                 DEBUG(0,("dcerpc_smb2: short packet (length %d) in read callback!\n",
 110                          (int)state->data.length));
 111                 talloc_free(state);
 112                 pipe_dead(c, NT_STATUS_INFO_LENGTH_MISMATCH);
 113                 return;
 114         }
 115
 116         frag_length = dcerpc_get_frag_length(&state->data);
 117
 118         if (frag_length <= state->data.length) {
 119                 DATA_BLOB data = state->data;
 120                 talloc_steal(c, data.data);
 121                 talloc_free(state);
 122                 c->transport.recv_data(c, &data, NT_STATUS_OK);
 123                 return;
 124         }
 125
 126         /* initiate another read request, as we only got part of a fragment */
 127         ZERO_STRUCT(io);
 128         io.in.file.handle = smb->handle;
 129         io.in.length = MIN(state->c->srv_max_xmit_frag,
 130                            frag_length - state->data.length);
 131         if (io.in.length < 16) {
 132                 io.in.length = 16;
 133         }
 134
 135         req = smb2_read_send(smb->tree, &io);
 136         if (req == NULL) {
 137                 talloc_free(state);
 138                 pipe_dead(c, NT_STATUS_NO_MEMORY);
 139                 return;
 140         }
 141
 142         req->async.fn = smb2_read_callback;
 143         req->async.private_data = state;
 144 }
 145
 146
 147 /*
 148   trigger a read request from the server, possibly with some initial
 149   data in the read buffer
 150 */
 151 static NTSTATUS send_read_request_continue(struct dcecli_connection *c, DATA_BLOB *blob)
 152 {
 153         struct smb2_private *smb = (struct smb2_private *)c->transport.private_data;
 154         struct smb2_read io;
 155         struct smb2_read_state *state;
 156         struct smb2_request *req;
 157
 158         state = talloc(c, struct smb2_read_state);
 159         if (state == NULL) {
 160                 return NT_STATUS_NO_MEMORY;
 161         }
 162
 163         state->c = c;
 164         if (blob == NULL) {
 165                 state->data = data_blob(NULL, 0);
 166         } else {
 167                 state->data = *blob;
 168                 talloc_steal(state, state->data.data);
 169         }
 170
 171         ZERO_STRUCT(io);
 172         io.in.file.handle = smb->handle;
 173
 174         if (state->data.length >= 16) {
 175                 uint16_t frag_length = dcerpc_get_frag_length(&state->data);
 176                 io.in.length = frag_length - state->data.length;
 177         } else {
 178                 io.in.length = 0x2000;
 179         }
 180
 181         req = smb2_read_send(smb->tree, &io);
 182         if (req == NULL) {
 183                 return NT_STATUS_NO_MEMORY;
 184         }
 185
 186         req->async.fn = smb2_read_callback;
 187         req->async.private_data = state;
 188
 189         return NT_STATUS_OK;
 190 }
 191
 192
 193 /*
 194   trigger a read request from the server
 195 */
 196 static NTSTATUS send_read_request(struct dcecli_connection *c)
 197 {
 198         struct smb2_private *smb = (struct smb2_private *)c->transport.private_data;
 199
 200         if (smb->dead) {
 201                 return NT_STATUS_CONNECTION_DISCONNECTED;
 202         }
 203
 204         return send_read_request_continue(c, NULL);
 205 }
 206
 207 /*
 208    this holds the state of an in-flight trans call
 209 */
 210 struct smb2_trans_state {
 211         struct dcecli_connection *c;
 212 };
 213
 214 /*
 215   called when a trans request has completed
 216 */
 217 static void smb2_trans_callback(struct smb2_request *req)
 218 {
 219         struct smb2_trans_state *state = talloc_get_type(req->async.private_data,
 220                                                         struct smb2_trans_state);
 221         struct dcecli_connection *c = state->c;
 222         NTSTATUS status;
 223         struct smb2_ioctl io;
 224
 225         status = smb2_ioctl_recv(req, state, &io);
 226         if (NT_STATUS_IS_ERR(status)) {
 227                 pipe_dead(c, status);
 228                 return;
 229         }
 230
 231         if (!NT_STATUS_EQUAL(status, STATUS_BUFFER_OVERFLOW)) {
 232                 DATA_BLOB data = io.out.out;
 233                 talloc_steal(c, data.data);
 234                 talloc_free(state);
 235                 c->transport.recv_data(c, &data, NT_STATUS_OK);
 236                 return;
 237         }
 238
 239         /* there is more to receive - setup a read */
 240         send_read_request_continue(c, &io.out.out);
 241         talloc_free(state);
 242 }
 243
 244 /*
 245   send a SMBtrans style request, using a named pipe read_write fsctl
 246 */
 247 static NTSTATUS smb2_send_trans_request(struct dcecli_connection *c, DATA_BLOB *blob)
 248 {
 249         struct smb2_private *smb = talloc_get_type(c->transport.private_data,
 250                                                    struct smb2_private);
 251         struct smb2_ioctl io;
 252         struct smb2_trans_state *state;
 253         struct smb2_request *req;
 254
 255         state = talloc(smb, struct smb2_trans_state);
 256         if (state == NULL) {
 257                 return NT_STATUS_NO_MEMORY;
 258         }
 259
 260         state->c = c;
 261
 262         ZERO_STRUCT(io);
 263         io.in.file.handle       = smb->handle;
 264         io.in.function          = FSCTL_NAMED_PIPE_READ_WRITE;
 265         io.in.max_response_size = 0x2000;
 266         io.in.flags             = 1;
 267         io.in.out               = *blob;
 268
 269         req = smb2_ioctl_send(smb->tree, &io);
 270         if (req == NULL) {
 271                 talloc_free(state);
 272                 return NT_STATUS_NO_MEMORY;
 273         }
 274
 275         req->async.fn = smb2_trans_callback;
 276         req->async.private_data = state;
 277
 278         talloc_steal(state, req);
 279
 280         return NT_STATUS_OK;
 281 }
 282
 283 /*
 284   called when a write request has completed
 285 */
 286 static void smb2_write_callback(struct smb2_request *req)
 287 {
 288         struct dcecli_connection *c = (struct dcecli_connection *)req->async.private_data;
 289         struct smb2_write io;
 290         NTSTATUS status;
 291
 292         ZERO_STRUCT(io);
 293
 294         status = smb2_write_recv(req, &io);
 295         if (!NT_STATUS_IS_OK(status)) {
 296                 DEBUG(0,("dcerpc_smb2: write callback error: %s\n",
 297                          nt_errstr(status)));
 298                 pipe_dead(c, status);
 299         }
 300 }
 301
 302 /*
 303    send a packet to the server
 304 */
 305 static NTSTATUS smb2_send_request(struct dcecli_connection *c, DATA_BLOB *blob,
 306                                   bool trigger_read)
 307 {
 308         struct smb2_private *smb = (struct smb2_private *)c->transport.private_data;
 309         struct smb2_write io;
 310         struct smb2_request *req;
 311
 312         if (smb->dead) {
 313                 return NT_STATUS_CONNECTION_DISCONNECTED;
 314         }
 315
 316         if (trigger_read) {
 317                 return smb2_send_trans_request(c, blob);
 318         }
 319
 320         ZERO_STRUCT(io);
 321         io.in.file.handle       = smb->handle;
 322         io.in.data              = *blob;
 323
 324         req = smb2_write_send(smb->tree, &io);
 325         if (req == NULL) {
 326                 return NT_STATUS_NO_MEMORY;
 327         }
 328
 329         req->async.fn = smb2_write_callback;
 330         req->async.private_data = c;
 331
 332         return NT_STATUS_OK;
 333 }
 334
 335 static void free_request(struct smb2_request *req)
 336 {
 337         talloc_free(req);
 338 }
 339
 340 /*
 341    shutdown SMB pipe connection
 342 */
 343 static NTSTATUS smb2_shutdown_pipe(struct dcecli_connection *c, NTSTATUS status)
 344 {
 345         struct smb2_private *smb = (struct smb2_private *)c->transport.private_data;
 346         struct smb2_close io;
 347         struct smb2_request *req;
 348
 349         /* maybe we're still starting up */
 350         if (!smb) return status;
 351
 352         ZERO_STRUCT(io);
 353         io.in.file.handle = smb->handle;
 354         req = smb2_close_send(smb->tree, &io);
 355         if (req != NULL) {
 356                 /* we don't care if this fails, so just free it if it succeeds */
 357                 req->async.fn = free_request;
 358         }
 359
 360         talloc_free(smb);
 361
 362         return status;
 363 }
 364
 365 /*
 366   return SMB server name
 367 */
 368 static const char *smb2_peer_name(struct dcecli_connection *c)
 369 {
 370         struct smb2_private *smb = talloc_get_type(c->transport.private_data,
 371                                                    struct smb2_private);
 372         return smb->server_name;
 373 }
 374
 375 /*
 376   return remote name we make the actual connection (good for kerberos)
 377 */
 378 static const char *smb2_target_hostname(struct dcecli_connection *c)
 379 {
 380         struct smb2_private *smb = talloc_get_type(c->transport.private_data,
 381                                                    struct smb2_private);
 382         return smbXcli_conn_remote_name(smb->tree->session->transport->conn);
 383 }
 384
 385 /*
 386   fetch the user session key
 387 */
 388 static NTSTATUS smb2_session_key(struct dcecli_connection *c, DATA_BLOB *session_key)
 389 {
 390         struct smb2_private *smb = talloc_get_type(c->transport.private_data,
 391                                                    struct smb2_private);
 392
 393         if (smb == NULL) return NT_STATUS_CONNECTION_DISCONNECTED;
 394
 395         if (smb->session_key.length == 0) {
 396                 return NT_STATUS_NO_USER_SESSION_KEY;
 397         }
 398
 399         *session_key = smb->session_key;
 400         return NT_STATUS_OK;
 401 }
 402
 403 struct pipe_open_smb2_state {
 404         struct dcecli_connection *c;
 405         struct composite_context *ctx;
 406 };
 407
 408 static void pipe_open_recv(struct smb2_request *req);
 409
 410 struct composite_context *dcerpc_pipe_open_smb2_send(struct dcerpc_pipe *p,
 411                                                      struct smb2_tree *tree,
 412                                                      const char *pipe_name)
 413 {
 414         struct composite_context *ctx;
 415         struct pipe_open_smb2_state *state;
 416         struct smb2_create io;
 417         struct smb2_request *req;
 418         struct dcecli_connection *c = p->conn;
 419
 420         /* if we don't have a binding on this pipe yet, then create one */
 421         if (p->binding == NULL) {
 422                 NTSTATUS status;
 423                 const char *r = smbXcli_conn_remote_name(tree->session->transport->conn);
 424                 char *s;
 425                 SMB_ASSERT(r != NULL);
 426                 s = talloc_asprintf(p, "ncacn_np:%s", r);
 427                 if (s == NULL) return NULL;
 428                 status = dcerpc_parse_binding(p, s, &p->binding);
 429                 talloc_free(s);
 430                 if (!NT_STATUS_IS_OK(status)) {
 431                         return NULL;
 432                 }
 433         }
 434
 435         ctx = composite_create(c, c->event_ctx);
 436         if (ctx == NULL) return NULL;
 437
 438         state = talloc(ctx, struct pipe_open_smb2_state);
 439         if (composite_nomem(state, ctx)) return ctx;
 440         ctx->private_data = state;
 441
 442         state->c = c;
 443         state->ctx = ctx;
 444
 445         ZERO_STRUCT(io);
 446         io.in.desired_access =
 447                 SEC_STD_READ_CONTROL |
 448                 SEC_FILE_READ_ATTRIBUTE |
 449                 SEC_FILE_WRITE_ATTRIBUTE |
 450                 SEC_STD_SYNCHRONIZE |
 451                 SEC_FILE_READ_EA |
 452                 SEC_FILE_WRITE_EA |
 453                 SEC_FILE_READ_DATA |
 454                 SEC_FILE_WRITE_DATA |
 455                 SEC_FILE_APPEND_DATA;
 456         io.in.share_access =
 457                 NTCREATEX_SHARE_ACCESS_READ |
 458                 NTCREATEX_SHARE_ACCESS_WRITE;
 459         io.in.create_disposition = NTCREATEX_DISP_OPEN;
 460         io.in.create_options   =
 461                 NTCREATEX_OPTIONS_NON_DIRECTORY_FILE |
 462                 NTCREATEX_OPTIONS_NO_RECALL;
 463         io.in.impersonation_level = NTCREATEX_IMPERSONATION_IMPERSONATION;
 464
 465         if ((strncasecmp(pipe_name, "/pipe/", 6) == 0) ||
 466             (strncasecmp(pipe_name, "\\pipe\\", 6) == 0)) {
 467                 pipe_name += 6;
 468         }
 469         io.in.fname = pipe_name;
 470
 471         req = smb2_create_send(tree, &io);
 472         composite_continue_smb2(ctx, req, pipe_open_recv, state);
 473         return ctx;
 474 }
 475
 476 static void pipe_open_recv(struct smb2_request *req)
 477 {
 478         struct pipe_open_smb2_state *state =
 479                 talloc_get_type(req->async.private_data,
 480                                 struct pipe_open_smb2_state);
 481         struct composite_context *ctx = state->ctx;
 482         struct dcecli_connection *c = state->c;
 483         struct smb2_tree *tree = req->tree;
 484         struct smb2_private *smb;
 485         struct smb2_create io;
 486
 487         ctx->status = smb2_create_recv(req, state, &io);
 488         if (!composite_is_ok(ctx)) return;
 489
 490         /*
 491           fill in the transport methods
 492         */
 493         c->transport.transport = NCACN_NP;
 494         c->transport.private_data = NULL;
 495         c->transport.shutdown_pipe = smb2_shutdown_pipe;
 496         c->transport.peer_name = smb2_peer_name;
 497         c->transport.target_hostname = smb2_target_hostname;
 498
 499         c->transport.send_request = smb2_send_request;
 500         c->transport.send_read = send_read_request;
 501         c->transport.recv_data = NULL;
 502
 503         /* Over-ride the default session key with the SMB session key */
 504         c->security_state.session_key = smb2_session_key;
 505
 506         smb = talloc(c, struct smb2_private);
 507         if (composite_nomem(smb, ctx)) return;
 508
 509         smb->handle     = io.out.file.handle;
 510         smb->tree       = talloc_reference(smb, tree);
 511         smb->server_name= strupper_talloc(smb,
 512                                           smbXcli_conn_remote_name(tree->session->transport->conn));
 513         if (composite_nomem(smb->server_name, ctx)) return;
 514         smb->dead       = false;
 515
 516         ctx->status = smbXcli_session_application_key(tree->session->smbXcli,
 517                                                       smb, &smb->session_key);
 518         if (NT_STATUS_EQUAL(ctx->status, NT_STATUS_NO_USER_SESSION_KEY)) {
 519                 smb->session_key = data_blob_null;
 520                 ctx->status = NT_STATUS_OK;
 521         }
 522         if (!composite_is_ok(ctx)) return;
 523
 524         c->transport.private_data = smb;
 525
 526         composite_done(ctx);
 527 }
 528
 529 NTSTATUS dcerpc_pipe_open_smb2_recv(struct composite_context *c)
 530 {
 531         NTSTATUS status = composite_wait(c);
 532         talloc_free(c);
 533         return status;
 534 }
 535
 536 NTSTATUS dcerpc_pipe_open_smb2(struct dcerpc_pipe *p,
 537                                struct smb2_tree *tree,
 538                                const char *pipe_name)
 539 {
 540         struct composite_context *ctx = dcerpc_pipe_open_smb2_send(p, tree, pipe_name);
 541         return dcerpc_pipe_open_smb2_recv(ctx);
 542 }
 543
 544 /*
 545   return the SMB2 tree used for a dcerpc over SMB2 pipe
 546 */
 547 struct smb2_tree *dcerpc_smb2_tree(struct dcecli_connection *c)
 548 {
 549         struct smb2_private *smb = talloc_get_type(c->transport.private_data,
 550                                                    struct smb2_private);
 551         return smb->tree;
 552 }