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
 177                 if (frag_length < state->data.length) {
 178                         talloc_free(state);
 179                         return NT_STATUS_RPC_PROTOCOL_ERROR;
 180                 }
 181
 182                 io.in.length = frag_length - state->data.length;
 183         } else {
 184                 io.in.length = 0x2000;
 185         }
 186
 187         req = smb2_read_send(smb->tree, &io);
 188         if (req == NULL) {
 189                 return NT_STATUS_NO_MEMORY;
 190         }
 191
 192         req->async.fn = smb2_read_callback;
 193         req->async.private_data = state;
 194
 195         return NT_STATUS_OK;
 196 }
 197
 198
 199 /*
 200   trigger a read request from the server
 201 */
 202 static NTSTATUS send_read_request(struct dcecli_connection *c)
 203 {
 204         struct smb2_private *smb = (struct smb2_private *)c->transport.private_data;
 205
 206         if (smb->dead) {
 207                 return NT_STATUS_CONNECTION_DISCONNECTED;
 208         }
 209
 210         return send_read_request_continue(c, NULL);
 211 }
 212
 213 /*
 214    this holds the state of an in-flight trans call
 215 */
 216 struct smb2_trans_state {
 217         struct dcecli_connection *c;
 218 };
 219
 220 /*
 221   called when a trans request has completed
 222 */
 223 static void smb2_trans_callback(struct smb2_request *req)
 224 {
 225         struct smb2_trans_state *state = talloc_get_type(req->async.private_data,
 226                                                         struct smb2_trans_state);
 227         struct dcecli_connection *c = state->c;
 228         NTSTATUS status;
 229         struct smb2_ioctl io;
 230
 231         status = smb2_ioctl_recv(req, state, &io);
 232         if (NT_STATUS_IS_ERR(status)) {
 233                 pipe_dead(c, status);
 234                 return;
 235         }
 236
 237         if (!NT_STATUS_EQUAL(status, STATUS_BUFFER_OVERFLOW)) {
 238                 DATA_BLOB data = io.out.out;
 239                 talloc_steal(c, data.data);
 240                 talloc_free(state);
 241                 c->transport.recv_data(c, &data, NT_STATUS_OK);
 242                 return;
 243         }
 244
 245         /* there is more to receive - setup a read */
 246         send_read_request_continue(c, &io.out.out);
 247         talloc_free(state);
 248 }
 249
 250 /*
 251   send a SMBtrans style request, using a named pipe read_write fsctl
 252 */
 253 static NTSTATUS smb2_send_trans_request(struct dcecli_connection *c, DATA_BLOB *blob)
 254 {
 255         struct smb2_private *smb = talloc_get_type(c->transport.private_data,
 256                                                    struct smb2_private);
 257         struct smb2_ioctl io;
 258         struct smb2_trans_state *state;
 259         struct smb2_request *req;
 260
 261         state = talloc(smb, struct smb2_trans_state);
 262         if (state == NULL) {
 263                 return NT_STATUS_NO_MEMORY;
 264         }
 265
 266         state->c = c;
 267
 268         ZERO_STRUCT(io);
 269         io.in.file.handle       = smb->handle;
 270         io.in.function          = FSCTL_NAMED_PIPE_READ_WRITE;
 271         io.in.max_response_size = 0x2000;
 272         io.in.flags             = 1;
 273         io.in.out               = *blob;
 274
 275         req = smb2_ioctl_send(smb->tree, &io);
 276         if (req == NULL) {
 277                 talloc_free(state);
 278                 return NT_STATUS_NO_MEMORY;
 279         }
 280
 281         req->async.fn = smb2_trans_callback;
 282         req->async.private_data = state;
 283
 284         talloc_steal(state, req);
 285
 286         return NT_STATUS_OK;
 287 }
 288
 289 /*
 290   called when a write request has completed
 291 */
 292 static void smb2_write_callback(struct smb2_request *req)
 293 {
 294         struct dcecli_connection *c = (struct dcecli_connection *)req->async.private_data;
 295         struct smb2_write io;
 296         NTSTATUS status;
 297
 298         ZERO_STRUCT(io);
 299
 300         status = smb2_write_recv(req, &io);
 301         if (!NT_STATUS_IS_OK(status)) {
 302                 DEBUG(0,("dcerpc_smb2: write callback error: %s\n",
 303                          nt_errstr(status)));
 304                 pipe_dead(c, status);
 305         }
 306 }
 307
 308 /*
 309    send a packet to the server
 310 */
 311 static NTSTATUS smb2_send_request(struct dcecli_connection *c, DATA_BLOB *blob,
 312                                   bool trigger_read)
 313 {
 314         struct smb2_private *smb = (struct smb2_private *)c->transport.private_data;
 315         struct smb2_write io;
 316         struct smb2_request *req;
 317
 318         if (smb->dead) {
 319                 return NT_STATUS_CONNECTION_DISCONNECTED;
 320         }
 321
 322         if (trigger_read) {
 323                 return smb2_send_trans_request(c, blob);
 324         }
 325
 326         ZERO_STRUCT(io);
 327         io.in.file.handle       = smb->handle;
 328         io.in.data              = *blob;
 329
 330         req = smb2_write_send(smb->tree, &io);
 331         if (req == NULL) {
 332                 return NT_STATUS_NO_MEMORY;
 333         }
 334
 335         req->async.fn = smb2_write_callback;
 336         req->async.private_data = c;
 337
 338         return NT_STATUS_OK;
 339 }
 340
 341 static void free_request(struct smb2_request *req)
 342 {
 343         talloc_free(req);
 344 }
 345
 346 /*
 347    shutdown SMB pipe connection
 348 */
 349 static NTSTATUS smb2_shutdown_pipe(struct dcecli_connection *c, NTSTATUS status)
 350 {
 351         struct smb2_private *smb = (struct smb2_private *)c->transport.private_data;
 352         struct smb2_close io;
 353         struct smb2_request *req;
 354
 355         /* maybe we're still starting up */
 356         if (!smb) return status;
 357
 358         ZERO_STRUCT(io);
 359         io.in.file.handle = smb->handle;
 360         req = smb2_close_send(smb->tree, &io);
 361         if (req != NULL) {
 362                 /* we don't care if this fails, so just free it if it succeeds */
 363                 req->async.fn = free_request;
 364         }
 365
 366         talloc_free(smb);
 367
 368         return status;
 369 }
 370
 371 /*
 372   return SMB server name
 373 */
 374 static const char *smb2_peer_name(struct dcecli_connection *c)
 375 {
 376         struct smb2_private *smb = talloc_get_type(c->transport.private_data,
 377                                                    struct smb2_private);
 378         return smb->server_name;
 379 }
 380
 381 /*
 382   return remote name we make the actual connection (good for kerberos)
 383 */
 384 static const char *smb2_target_hostname(struct dcecli_connection *c)
 385 {
 386         struct smb2_private *smb = talloc_get_type(c->transport.private_data,
 387                                                    struct smb2_private);
 388         return smbXcli_conn_remote_name(smb->tree->session->transport->conn);
 389 }
 390
 391 /*
 392   fetch the user session key
 393 */
 394 static NTSTATUS smb2_session_key(struct dcecli_connection *c, DATA_BLOB *session_key)
 395 {
 396         struct smb2_private *smb = talloc_get_type(c->transport.private_data,
 397                                                    struct smb2_private);
 398
 399         if (smb == NULL) return NT_STATUS_CONNECTION_DISCONNECTED;
 400
 401         if (smb->session_key.length == 0) {
 402                 return NT_STATUS_NO_USER_SESSION_KEY;
 403         }
 404
 405         *session_key = smb->session_key;
 406         return NT_STATUS_OK;
 407 }
 408
 409 struct pipe_open_smb2_state {
 410         struct dcecli_connection *c;
 411         struct composite_context *ctx;
 412 };
 413
 414 static void pipe_open_recv(struct smb2_request *req);
 415
 416 struct composite_context *dcerpc_pipe_open_smb2_send(struct dcerpc_pipe *p,
 417                                                      struct smb2_tree *tree,
 418                                                      const char *pipe_name)
 419 {
 420         struct composite_context *ctx;
 421         struct pipe_open_smb2_state *state;
 422         struct smb2_create io;
 423         struct smb2_request *req;
 424         struct dcecli_connection *c = p->conn;
 425
 426         /* if we don't have a binding on this pipe yet, then create one */
 427         if (p->binding == NULL) {
 428                 NTSTATUS status;
 429                 const char *r = smbXcli_conn_remote_name(tree->session->transport->conn);
 430                 char *s;
 431                 SMB_ASSERT(r != NULL);
 432                 s = talloc_asprintf(p, "ncacn_np:%s", r);
 433                 if (s == NULL) return NULL;
 434                 status = dcerpc_parse_binding(p, s, &p->binding);
 435                 talloc_free(s);
 436                 if (!NT_STATUS_IS_OK(status)) {
 437                         return NULL;
 438                 }
 439         }
 440
 441         ctx = composite_create(c, c->event_ctx);
 442         if (ctx == NULL) return NULL;
 443
 444         state = talloc(ctx, struct pipe_open_smb2_state);
 445         if (composite_nomem(state, ctx)) return ctx;
 446         ctx->private_data = state;
 447
 448         state->c = c;
 449         state->ctx = ctx;
 450
 451         ZERO_STRUCT(io);
 452         io.in.desired_access =
 453                 SEC_STD_READ_CONTROL |
 454                 SEC_FILE_READ_ATTRIBUTE |
 455                 SEC_FILE_WRITE_ATTRIBUTE |
 456                 SEC_STD_SYNCHRONIZE |
 457                 SEC_FILE_READ_EA |
 458                 SEC_FILE_WRITE_EA |
 459                 SEC_FILE_READ_DATA |
 460                 SEC_FILE_WRITE_DATA |
 461                 SEC_FILE_APPEND_DATA;
 462         io.in.share_access =
 463                 NTCREATEX_SHARE_ACCESS_READ |
 464                 NTCREATEX_SHARE_ACCESS_WRITE;
 465         io.in.create_disposition = NTCREATEX_DISP_OPEN;
 466         io.in.create_options   =
 467                 NTCREATEX_OPTIONS_NON_DIRECTORY_FILE |
 468                 NTCREATEX_OPTIONS_NO_RECALL;
 469         io.in.impersonation_level = NTCREATEX_IMPERSONATION_IMPERSONATION;
 470
 471         if ((strncasecmp(pipe_name, "/pipe/", 6) == 0) ||
 472             (strncasecmp(pipe_name, "\\pipe\\", 6) == 0)) {
 473                 pipe_name += 6;
 474         }
 475         io.in.fname = pipe_name;
 476
 477         req = smb2_create_send(tree, &io);
 478         composite_continue_smb2(ctx, req, pipe_open_recv, state);
 479         return ctx;
 480 }
 481
 482 static void pipe_open_recv(struct smb2_request *req)
 483 {
 484         struct pipe_open_smb2_state *state =
 485                 talloc_get_type(req->async.private_data,
 486                                 struct pipe_open_smb2_state);
 487         struct composite_context *ctx = state->ctx;
 488         struct dcecli_connection *c = state->c;
 489         struct smb2_tree *tree = req->tree;
 490         struct smb2_private *smb;
 491         struct smb2_create io;
 492
 493         ctx->status = smb2_create_recv(req, state, &io);
 494         if (!composite_is_ok(ctx)) return;
 495
 496         /*
 497           fill in the transport methods
 498         */
 499         c->transport.transport = NCACN_NP;
 500         c->transport.private_data = NULL;
 501         c->transport.shutdown_pipe = smb2_shutdown_pipe;
 502         c->transport.peer_name = smb2_peer_name;
 503         c->transport.target_hostname = smb2_target_hostname;
 504
 505         c->transport.send_request = smb2_send_request;
 506         c->transport.send_read = send_read_request;
 507         c->transport.recv_data = NULL;
 508
 509         /* Over-ride the default session key with the SMB session key */
 510         c->security_state.session_key = smb2_session_key;
 511
 512         smb = talloc(c, struct smb2_private);
 513         if (composite_nomem(smb, ctx)) return;
 514
 515         smb->handle     = io.out.file.handle;
 516         smb->tree       = talloc_reference(smb, tree);
 517         smb->server_name= strupper_talloc(smb,
 518                                           smbXcli_conn_remote_name(tree->session->transport->conn));
 519         if (composite_nomem(smb->server_name, ctx)) return;
 520         smb->dead       = false;
 521
 522         ctx->status = smbXcli_session_application_key(tree->session->smbXcli,
 523                                                       smb, &smb->session_key);
 524         if (NT_STATUS_EQUAL(ctx->status, NT_STATUS_NO_USER_SESSION_KEY)) {
 525                 smb->session_key = data_blob_null;
 526                 ctx->status = NT_STATUS_OK;
 527         }
 528         if (!composite_is_ok(ctx)) return;
 529
 530         c->transport.private_data = smb;
 531
 532         composite_done(ctx);
 533 }
 534
 535 NTSTATUS dcerpc_pipe_open_smb2_recv(struct composite_context *c)
 536 {
 537         NTSTATUS status = composite_wait(c);
 538         talloc_free(c);
 539         return status;
 540 }
 541
 542 NTSTATUS dcerpc_pipe_open_smb2(struct dcerpc_pipe *p,
 543                                struct smb2_tree *tree,
 544                                const char *pipe_name)
 545 {
 546         struct composite_context *ctx = dcerpc_pipe_open_smb2_send(p, tree, pipe_name);
 547         return dcerpc_pipe_open_smb2_recv(ctx);
 548 }
 549
 550 /*
 551   return the SMB2 tree used for a dcerpc over SMB2 pipe
 552 */
 553 struct smb2_tree *dcerpc_smb2_tree(struct dcecli_connection *c)
 554 {
 555         struct smb2_private *smb = talloc_get_type(c->transport.private_data,
 556                                                    struct smb2_private);
 557         return smb->tree;
 558 }