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 2 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, write to the Free Software
  20    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21 */
  22
  23 #include "includes.h"
  24 #include "libcli/raw/libcliraw.h"
  25 #include "librpc/gen_ndr/ndr_security.h"
  26 #include "libcli/composite/composite.h"
  27 #include "libcli/smb2/smb2.h"
  28 #include "libcli/smb2/smb2_calls.h"
  29 #include "ioctl.h"
  30
  31 /* transport private information used by SMB2 pipe transport */
  32 struct smb2_private {
  33         struct smb2_handle handle;
  34         struct smb2_tree *tree;
  35         const char *server_name;
  36 };
  37
  38
  39 /*
  40   tell the dcerpc layer that the transport is dead
  41 */
  42 static void pipe_dead(struct dcerpc_connection *c, NTSTATUS status)
  43 {
  44         c->transport.recv_data(c, NULL, status);
  45 }
  46
  47
  48 /*
  49    this holds the state of an in-flight call
  50 */
  51 struct smb2_read_state {
  52         struct dcerpc_connection *c;
  53         DATA_BLOB data;
  54 };
  55
  56 /*
  57   called when a read request has completed
  58 */
  59 static void smb2_read_callback(struct smb2_request *req)
  60 {
  61         struct smb2_private *smb;
  62         struct smb2_read_state *state;
  63         struct smb2_read io;
  64         uint16_t frag_length;
  65         NTSTATUS status;
  66
  67         state = talloc_get_type(req->async.private, struct smb2_read_state);
  68         smb = talloc_get_type(state->c->transport.private, struct smb2_private);
  69
  70         status = smb2_read_recv(req, state, &io);
  71         if (NT_STATUS_IS_ERR(status)) {
  72                 pipe_dead(state->c, status);
  73                 talloc_free(state);
  74                 return;
  75         }
  76
  77         status = data_blob_append(state, &state->data,
  78                                   io.out.data.data, io.out.data.length);
  79         if (NT_STATUS_IS_ERR(status)) {
  80                 pipe_dead(state->c, status);
  81                 talloc_free(state);
  82                 return;
  83         }
  84
  85         if (state->data.length < 16) {
  86                 DEBUG(0,("dcerpc_smb2: short packet (length %d) in read callback!\n",
  87                          (int)state->data.length));
  88                 pipe_dead(state->c, NT_STATUS_INFO_LENGTH_MISMATCH);
  89                 talloc_free(state);
  90                 return;
  91         }
  92
  93         frag_length = dcerpc_get_frag_length(&state->data);
  94
  95         if (frag_length <= state->data.length) {
  96                 DATA_BLOB data = state->data;
  97                 struct dcerpc_connection *c = state->c;
  98                 talloc_steal(c, data.data);
  99                 talloc_free(state);
 100                 c->transport.recv_data(c, &data, NT_STATUS_OK);
 101                 return;
 102         }
 103
 104         /* initiate another read request, as we only got part of a fragment */
 105         ZERO_STRUCT(io);
 106         io.in.length = MIN(state->c->srv_max_xmit_frag,
 107                            frag_length - state->data.length);
 108         if (io.in.length < 16) {
 109                 io.in.length = 16;
 110         }
 111         io.in.handle = smb->handle;
 112
 113         req = smb2_read_send(smb->tree, &io);
 114         if (req == NULL) {
 115                 pipe_dead(state->c, NT_STATUS_NO_MEMORY);
 116                 talloc_free(state);
 117                 return;
 118         }
 119
 120         req->async.fn = smb2_read_callback;
 121         req->async.private = state;
 122 }
 123
 124
 125 /*
 126   trigger a read request from the server, possibly with some initial
 127   data in the read buffer
 128 */
 129 static NTSTATUS send_read_request_continue(struct dcerpc_connection *c, DATA_BLOB *blob)
 130 {
 131         struct smb2_private *smb = c->transport.private;
 132         struct smb2_read io;
 133         struct smb2_read_state *state;
 134         struct smb2_request *req;
 135
 136         state = talloc(smb, struct smb2_read_state);
 137         if (state == NULL) {
 138                 return NT_STATUS_NO_MEMORY;
 139         }
 140
 141         state->c = c;
 142         if (blob == NULL) {
 143                 state->data = data_blob(NULL, 0);
 144         } else {
 145                 state->data = *blob;
 146                 talloc_steal(state, state->data.data);
 147         }
 148
 149         ZERO_STRUCT(io);
 150         io.in.handle = smb->handle;
 151
 152         if (state->data.length >= 16) {
 153                 uint16_t frag_length = dcerpc_get_frag_length(&state->data);
 154                 io.in.length = frag_length - state->data.length;
 155         } else {
 156                 io.in.length = 0x2000;
 157         }
 158
 159         req = smb2_read_send(smb->tree, &io);
 160         if (req == NULL) {
 161                 return NT_STATUS_NO_MEMORY;
 162         }
 163
 164         req->async.fn = smb2_read_callback;
 165         req->async.private = state;
 166
 167         return NT_STATUS_OK;
 168 }
 169
 170
 171 /*
 172   trigger a read request from the server
 173 */
 174 static NTSTATUS send_read_request(struct dcerpc_connection *c)
 175 {
 176         return send_read_request_continue(c, NULL);
 177 }
 178
 179 /*
 180    this holds the state of an in-flight trans call
 181 */
 182 struct smb2_trans_state {
 183         struct dcerpc_connection *c;
 184 };
 185
 186 /*
 187   called when a trans request has completed
 188 */
 189 static void smb2_trans_callback(struct smb2_request *req)
 190 {
 191         struct smb2_trans_state *state = talloc_get_type(req->async.private,
 192                                                         struct smb2_trans_state);
 193         struct dcerpc_connection *c = state->c;
 194         NTSTATUS status;
 195         struct smb2_ioctl io;
 196
 197         status = smb2_ioctl_recv(req, state, &io);
 198         if (NT_STATUS_IS_ERR(status)) {
 199                 pipe_dead(c, status);
 200                 return;
 201         }
 202
 203         if (!NT_STATUS_EQUAL(status, STATUS_BUFFER_OVERFLOW)) {
 204                 DATA_BLOB data = io.out.out;
 205                 talloc_steal(c, data.data);
 206                 talloc_free(state);
 207                 c->transport.recv_data(c, &data, NT_STATUS_OK);
 208                 return;
 209         }
 210
 211         /* there is more to receive - setup a read */
 212         send_read_request_continue(c, &io.out.out);
 213         talloc_free(state);
 214 }
 215
 216 /*
 217   send a SMBtrans style request, using a named pipe read_write fsctl
 218 */
 219 static NTSTATUS smb2_send_trans_request(struct dcerpc_connection *c, DATA_BLOB *blob)
 220 {
 221         struct smb2_private *smb = talloc_get_type(c->transport.private,
 222                                                    struct smb2_private);
 223         struct smb2_ioctl io;
 224         struct smb2_trans_state *state;
 225         struct smb2_request *req;
 226
 227         state = talloc(smb, struct smb2_trans_state);
 228         if (state == NULL) {
 229                 return NT_STATUS_NO_MEMORY;
 230         }
 231
 232         state->c = c;
 233
 234         ZERO_STRUCT(io);
 235         io.in.function = FSCTL_NAMED_PIPE_READ_WRITE;
 236         io.in.handle = smb->handle;
 237         io.in.max_response_size = 0x1000;
 238         io.in.flags = 1;
 239         io.in.out = *blob;
 240
 241         req = smb2_ioctl_send(smb->tree, &io);
 242         if (req == NULL) {
 243                 talloc_free(state);
 244                 return NT_STATUS_NO_MEMORY;
 245         }
 246
 247         req->async.fn = smb2_trans_callback;
 248         req->async.private = state;
 249
 250         talloc_steal(state, req);
 251
 252         return NT_STATUS_OK;
 253 }
 254
 255 /*
 256   called when a write request has completed
 257 */
 258 static void smb2_write_callback(struct smb2_request *req)
 259 {
 260         struct dcerpc_connection *c = req->async.private;
 261
 262         if (!NT_STATUS_IS_OK(req->status)) {
 263                 DEBUG(0,("dcerpc_smb2: write callback error\n"));
 264                 pipe_dead(c, req->status);
 265         }
 266
 267         smb2_request_destroy(req);
 268 }
 269
 270 /*
 271    send a packet to the server
 272 */
 273 static NTSTATUS smb2_send_request(struct dcerpc_connection *c, DATA_BLOB *blob,
 274                                   BOOL trigger_read)
 275 {
 276         struct smb2_private *smb = c->transport.private;
 277         struct smb2_write io;
 278         struct smb2_request *req;
 279
 280         if (trigger_read) {
 281                 return smb2_send_trans_request(c, blob);
 282         }
 283
 284         ZERO_STRUCT(io);
 285         io.in.handle = smb->handle;
 286         io.in.data = *blob;
 287
 288         req = smb2_write_send(smb->tree, &io);
 289         if (req == NULL) {
 290                 return NT_STATUS_NO_MEMORY;
 291         }
 292
 293         req->async.fn = smb2_write_callback;
 294         req->async.private = c;
 295
 296         return NT_STATUS_OK;
 297 }
 298
 299 /*
 300    shutdown SMB pipe connection
 301 */
 302 static NTSTATUS smb2_shutdown_pipe(struct dcerpc_connection *c)
 303 {
 304         struct smb2_private *smb = c->transport.private;
 305         struct smb2_close io;
 306         struct smb2_request *req;
 307
 308         /* maybe we're still starting up */
 309         if (!smb) return NT_STATUS_OK;
 310
 311         ZERO_STRUCT(io);
 312         io.in.handle = smb->handle;
 313         req = smb2_close_send(smb->tree, &io);
 314         if (req != NULL) {
 315                 /* we don't care if this fails, so just free it if it succeeds */
 316                 req->async.fn = (void (*)(struct smb2_request *))talloc_free;
 317         }
 318
 319         talloc_free(smb);
 320
 321         return NT_STATUS_OK;
 322 }
 323
 324 /*
 325   return SMB server name
 326 */
 327 static const char *smb2_peer_name(struct dcerpc_connection *c)
 328 {
 329         struct smb2_private *smb = talloc_get_type(c->transport.private,
 330                                                    struct smb2_private);
 331         return smb->server_name;
 332 }
 333
 334 /*
 335   fetch the user session key
 336 */
 337 static NTSTATUS smb2_session_key(struct dcerpc_connection *c, DATA_BLOB *session_key)
 338 {
 339         struct smb2_private *smb = talloc_get_type(c->transport.private,
 340                                                    struct smb2_private);
 341         *session_key = smb->tree->session->session_key;
 342         if (session_key->data == NULL) {
 343                 return NT_STATUS_NO_USER_SESSION_KEY;
 344         }
 345         return NT_STATUS_OK;
 346 }
 347
 348 struct pipe_open_smb2_state {
 349         struct dcerpc_connection *c;
 350         struct composite_context *ctx;
 351 };
 352
 353 static void pipe_open_recv(struct smb2_request *req);
 354
 355 struct composite_context *dcerpc_pipe_open_smb2_send(struct dcerpc_connection *c,
 356                                                      struct smb2_tree *tree,
 357                                                      const char *pipe_name)
 358 {
 359         struct composite_context *ctx;
 360         struct pipe_open_smb2_state *state;
 361         struct smb2_create io;
 362         struct smb2_request *req;
 363
 364         ctx = talloc_zero(NULL, struct composite_context);
 365         if (ctx == NULL) goto failed;
 366         ctx->state = COMPOSITE_STATE_IN_PROGRESS;
 367         ctx->event_ctx = talloc_reference(c, c->event_ctx);
 368
 369         state = talloc(ctx, struct pipe_open_smb2_state);
 370         if (state == NULL) goto failed;
 371
 372         state->c = c;
 373         state->ctx = ctx;
 374
 375         ZERO_STRUCT(io);
 376         io.in.access_mask =
 377                 SEC_STD_READ_CONTROL |
 378                 SEC_FILE_READ_ATTRIBUTE |
 379                 SEC_FILE_WRITE_ATTRIBUTE |
 380                 SEC_STD_SYNCHRONIZE |
 381                 SEC_FILE_READ_EA |
 382                 SEC_FILE_WRITE_EA |
 383                 SEC_FILE_READ_DATA |
 384                 SEC_FILE_WRITE_DATA |
 385                 SEC_FILE_APPEND_DATA;
 386         io.in.share_access =
 387                 NTCREATEX_SHARE_ACCESS_READ |
 388                 NTCREATEX_SHARE_ACCESS_WRITE;
 389         io.in.open_disposition = NTCREATEX_DISP_OPEN;
 390         io.in.create_options   =
 391                 NTCREATEX_OPTIONS_NON_DIRECTORY_FILE |
 392                 NTCREATEX_OPTIONS_UNKNOWN_400000;
 393         io.in.impersonation    = NTCREATEX_IMPERSONATION_IMPERSONATION;
 394
 395         if ((strncasecmp(pipe_name, "/pipe/", 6) == 0) ||
 396             (strncasecmp(pipe_name, "\\pipe\\", 6) == 0)) {
 397                 pipe_name += 6;
 398         }
 399         io.in.fname = pipe_name;
 400
 401         req = smb2_create_send(tree, &io);
 402         if (req == NULL) goto failed;
 403
 404         req->async.fn = pipe_open_recv;
 405         req->async.private = state;
 406
 407         return ctx;
 408
 409  failed:
 410         talloc_free(ctx);
 411         return NULL;
 412 }
 413
 414 static void pipe_open_recv(struct smb2_request *req)
 415 {
 416         struct pipe_open_smb2_state *state =
 417                 talloc_get_type(req->async.private,
 418                                 struct pipe_open_smb2_state);
 419         struct composite_context *ctx = state->ctx;
 420         struct dcerpc_connection *c = state->c;
 421         struct smb2_tree *tree = req->tree;
 422         struct smb2_private *smb;
 423         struct smb2_create io;
 424
 425         ctx->status = smb2_create_recv(req, state, &io);
 426         if (!composite_is_ok(ctx)) return;
 427
 428         /*
 429           fill in the transport methods
 430         */
 431         c->transport.transport = NCACN_NP;
 432         c->transport.private = NULL;
 433         c->transport.shutdown_pipe = smb2_shutdown_pipe;
 434         c->transport.peer_name = smb2_peer_name;
 435
 436         c->transport.send_request = smb2_send_request;
 437         c->transport.send_read = send_read_request;
 438         c->transport.recv_data = NULL;
 439
 440         /* Over-ride the default session key with the SMB session key */
 441         c->security_state.session_key = smb2_session_key;
 442
 443         smb = talloc(c, struct smb2_private);
 444         if (composite_nomem(smb, ctx)) return;
 445
 446         smb->handle     = io.out.handle;
 447         smb->tree       = talloc_reference(smb, tree);
 448         smb->server_name= strupper_talloc(smb,
 449                                           tree->session->transport->socket->hostname);
 450         if (composite_nomem(smb->server_name, ctx)) return;
 451
 452         c->transport.private = smb;
 453
 454         composite_done(ctx);
 455 }
 456
 457 NTSTATUS dcerpc_pipe_open_smb2_recv(struct composite_context *c)
 458 {
 459         NTSTATUS status = composite_wait(c);
 460         talloc_free(c);
 461         return status;
 462 }
 463
 464 NTSTATUS dcerpc_pipe_open_smb2(struct dcerpc_connection *c,
 465                                struct smb2_tree *tree,
 466                                const char *pipe_name)
 467 {
 468         struct composite_context *ctx = dcerpc_pipe_open_smb2_send(c, tree, pipe_name);
 469         return dcerpc_pipe_open_smb2_recv(ctx);
 470 }
 471
 472 /*
 473   return the SMB2 tree used for a dcerpc over SMB2 pipe
 474 */
 475 struct smb2_tree *dcerpc_smb2_tree(struct dcerpc_connection *c)
 476 {
 477         struct smb2_private *smb = talloc_get_type(c->transport.private,
 478                                                    struct smb2_private);
 479         return smb->tree;
 480 }