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
  30 /* transport private information used by SMB2 pipe transport */
  31 struct smb2_private {
  32         struct smb2_handle handle;
  33         struct smb2_tree *tree;
  34         const char *server_name;
  35         bool dead;
  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         struct smb2_private *smb = (struct smb2_private *)c->transport.private_data;
  45
  46         if (smb->dead) {
  47                 return;
  48         }
  49
  50         smb->dead = true;
  51
  52         if (NT_STATUS_EQUAL(NT_STATUS_UNSUCCESSFUL, status)) {
  53                 status = NT_STATUS_UNEXPECTED_NETWORK_ERROR;
  54         }
  55
  56         if (NT_STATUS_EQUAL(NT_STATUS_OK, status)) {
  57                 status = NT_STATUS_END_OF_FILE;
  58         }
  59
  60         if (c->transport.recv_data) {
  61                 c->transport.recv_data(c, NULL, status);
  62         }
  63 }
  64
  65
  66 /*
  67    this holds the state of an in-flight call
  68 */
  69 struct smb2_read_state {
  70         struct dcerpc_connection *c;
  71         DATA_BLOB data;
  72 };
  73
  74 /*
  75   called when a read request has completed
  76 */
  77 static void smb2_read_callback(struct smb2_request *req)
  78 {
  79         struct smb2_private *smb;
  80         struct smb2_read_state *state;
  81         struct smb2_read io;
  82         uint16_t frag_length;
  83         NTSTATUS status;
  84
  85         state = talloc_get_type(req->async.private, struct smb2_read_state);
  86         smb = talloc_get_type(state->c->transport.private_data, struct smb2_private);
  87
  88         status = smb2_read_recv(req, state, &io);
  89         if (NT_STATUS_IS_ERR(status)) {
  90                 pipe_dead(state->c, status);
  91                 talloc_free(state);
  92                 return;
  93         }
  94
  95         if (!data_blob_append(state, &state->data,
  96                                   io.out.data.data, io.out.data.length)) {
  97                 pipe_dead(state->c, NT_STATUS_NO_MEMORY);
  98                 talloc_free(state);
  99                 return;
 100         }
 101
 102         if (state->data.length < 16) {
 103                 DEBUG(0,("dcerpc_smb2: short packet (length %d) in read callback!\n",
 104                          (int)state->data.length));
 105                 pipe_dead(state->c, NT_STATUS_INFO_LENGTH_MISMATCH);
 106                 talloc_free(state);
 107                 return;
 108         }
 109
 110         frag_length = dcerpc_get_frag_length(&state->data);
 111
 112         if (frag_length <= state->data.length) {
 113                 DATA_BLOB data = state->data;
 114                 struct dcerpc_connection *c = state->c;
 115                 talloc_steal(c, data.data);
 116                 talloc_free(state);
 117                 c->transport.recv_data(c, &data, NT_STATUS_OK);
 118                 return;
 119         }
 120
 121         /* initiate another read request, as we only got part of a fragment */
 122         ZERO_STRUCT(io);
 123         io.in.file.handle = smb->handle;
 124         io.in.length = MIN(state->c->srv_max_xmit_frag,
 125                            frag_length - state->data.length);
 126         if (io.in.length < 16) {
 127                 io.in.length = 16;
 128         }
 129
 130         req = smb2_read_send(smb->tree, &io);
 131         if (req == NULL) {
 132                 pipe_dead(state->c, NT_STATUS_NO_MEMORY);
 133                 talloc_free(state);
 134                 return;
 135         }
 136
 137         req->async.fn = smb2_read_callback;
 138         req->async.private = state;
 139 }
 140
 141
 142 /*
 143   trigger a read request from the server, possibly with some initial
 144   data in the read buffer
 145 */
 146 static NTSTATUS send_read_request_continue(struct dcerpc_connection *c, DATA_BLOB *blob)
 147 {
 148         struct smb2_private *smb = (struct smb2_private *)c->transport.private_data;
 149         struct smb2_read io;
 150         struct smb2_read_state *state;
 151         struct smb2_request *req;
 152
 153         state = talloc(smb, struct smb2_read_state);
 154         if (state == NULL) {
 155                 return NT_STATUS_NO_MEMORY;
 156         }
 157
 158         state->c = c;
 159         if (blob == NULL) {
 160                 state->data = data_blob(NULL, 0);
 161         } else {
 162                 state->data = *blob;
 163                 talloc_steal(state, state->data.data);
 164         }
 165
 166         ZERO_STRUCT(io);
 167         io.in.file.handle = smb->handle;
 168
 169         if (state->data.length >= 16) {
 170                 uint16_t frag_length = dcerpc_get_frag_length(&state->data);
 171                 io.in.length = frag_length - state->data.length;
 172         } else {
 173                 io.in.length = 0x2000;
 174         }
 175
 176         req = smb2_read_send(smb->tree, &io);
 177         if (req == NULL) {
 178                 return NT_STATUS_NO_MEMORY;
 179         }
 180
 181         req->async.fn = smb2_read_callback;
 182         req->async.private = state;
 183
 184         return NT_STATUS_OK;
 185 }
 186
 187
 188 /*
 189   trigger a read request from the server
 190 */
 191 static NTSTATUS send_read_request(struct dcerpc_connection *c)
 192 {
 193         struct smb2_private *smb = (struct smb2_private *)c->transport.private_data;
 194
 195         if (smb->dead) {
 196                 return NT_STATUS_CONNECTION_DISCONNECTED;
 197         }
 198
 199         return send_read_request_continue(c, NULL);
 200 }
 201
 202 /*
 203    this holds the state of an in-flight trans call
 204 */
 205 struct smb2_trans_state {
 206         struct dcerpc_connection *c;
 207 };
 208
 209 /*
 210   called when a trans request has completed
 211 */
 212 static void smb2_trans_callback(struct smb2_request *req)
 213 {
 214         struct smb2_trans_state *state = talloc_get_type(req->async.private,
 215                                                         struct smb2_trans_state);
 216         struct dcerpc_connection *c = state->c;
 217         NTSTATUS status;
 218         struct smb2_ioctl io;
 219
 220         status = smb2_ioctl_recv(req, state, &io);
 221         if (NT_STATUS_IS_ERR(status)) {
 222                 pipe_dead(c, status);
 223                 return;
 224         }
 225
 226         if (!NT_STATUS_EQUAL(status, STATUS_BUFFER_OVERFLOW)) {
 227                 DATA_BLOB data = io.out.out;
 228                 talloc_steal(c, data.data);
 229                 talloc_free(state);
 230                 c->transport.recv_data(c, &data, NT_STATUS_OK);
 231                 return;
 232         }
 233
 234         /* there is more to receive - setup a read */
 235         send_read_request_continue(c, &io.out.out);
 236         talloc_free(state);
 237 }
 238
 239 /*
 240   send a SMBtrans style request, using a named pipe read_write fsctl
 241 */
 242 static NTSTATUS smb2_send_trans_request(struct dcerpc_connection *c, DATA_BLOB *blob)
 243 {
 244         struct smb2_private *smb = talloc_get_type(c->transport.private_data,
 245                                                    struct smb2_private);
 246         struct smb2_ioctl io;
 247         struct smb2_trans_state *state;
 248         struct smb2_request *req;
 249
 250         state = talloc(smb, struct smb2_trans_state);
 251         if (state == NULL) {
 252                 return NT_STATUS_NO_MEMORY;
 253         }
 254
 255         state->c = c;
 256
 257         ZERO_STRUCT(io);
 258         io.in.file.handle       = smb->handle;
 259         io.in.function          = FSCTL_NAMED_PIPE_READ_WRITE;
 260         io.in.max_response_size = 0x1000;
 261         io.in.flags             = 1;
 262         io.in.out               = *blob;
 263
 264         req = smb2_ioctl_send(smb->tree, &io);
 265         if (req == NULL) {
 266                 talloc_free(state);
 267                 return NT_STATUS_NO_MEMORY;
 268         }
 269
 270         req->async.fn = smb2_trans_callback;
 271         req->async.private = state;
 272
 273         talloc_steal(state, req);
 274
 275         return NT_STATUS_OK;
 276 }
 277
 278 /*
 279   called when a write request has completed
 280 */
 281 static void smb2_write_callback(struct smb2_request *req)
 282 {
 283         struct dcerpc_connection *c = (struct dcerpc_connection *)req->async.private;
 284
 285         if (!NT_STATUS_IS_OK(req->status)) {
 286                 DEBUG(0,("dcerpc_smb2: write callback error\n"));
 287                 pipe_dead(c, req->status);
 288         }
 289
 290         smb2_request_destroy(req);
 291 }
 292
 293 /*
 294    send a packet to the server
 295 */
 296 static NTSTATUS smb2_send_request(struct dcerpc_connection *c, DATA_BLOB *blob,
 297                                   bool trigger_read)
 298 {
 299         struct smb2_private *smb = (struct smb2_private *)c->transport.private_data;
 300         struct smb2_write io;
 301         struct smb2_request *req;
 302
 303         if (smb->dead) {
 304                 return NT_STATUS_CONNECTION_DISCONNECTED;
 305         }
 306
 307         if (trigger_read) {
 308                 return smb2_send_trans_request(c, blob);
 309         }
 310
 311         ZERO_STRUCT(io);
 312         io.in.file.handle       = smb->handle;
 313         io.in.data              = *blob;
 314
 315         req = smb2_write_send(smb->tree, &io);
 316         if (req == NULL) {
 317                 return NT_STATUS_NO_MEMORY;
 318         }
 319
 320         req->async.fn = smb2_write_callback;
 321         req->async.private = c;
 322
 323         return NT_STATUS_OK;
 324 }
 325
 326 /*
 327    shutdown SMB pipe connection
 328 */
 329 static NTSTATUS smb2_shutdown_pipe(struct dcerpc_connection *c, NTSTATUS status)
 330 {
 331         struct smb2_private *smb = (struct smb2_private *)c->transport.private_data;
 332         struct smb2_close io;
 333         struct smb2_request *req;
 334
 335         /* maybe we're still starting up */
 336         if (!smb) return status;
 337
 338         ZERO_STRUCT(io);
 339         io.in.file.handle = smb->handle;
 340         req = smb2_close_send(smb->tree, &io);
 341         if (req != NULL) {
 342                 /* we don't care if this fails, so just free it if it succeeds */
 343                 req->async.fn = (void (*)(struct smb2_request *))talloc_free;
 344         }
 345
 346         talloc_free(smb);
 347
 348         return status;
 349 }
 350
 351 /*
 352   return SMB server name
 353 */
 354 static const char *smb2_peer_name(struct dcerpc_connection *c)
 355 {
 356         struct smb2_private *smb = talloc_get_type(c->transport.private_data,
 357                                                    struct smb2_private);
 358         return smb->server_name;
 359 }
 360
 361 /*
 362   return remote name we make the actual connection (good for kerberos)
 363 */
 364 static const char *smb2_target_hostname(struct dcerpc_connection *c)
 365 {
 366         struct smb2_private *smb = talloc_get_type(c->transport.private_data,
 367                                                    struct smb2_private);
 368         return smb->tree->session->transport->socket->hostname;
 369 }
 370
 371 /*
 372   fetch the user session key
 373 */
 374 static NTSTATUS smb2_session_key(struct dcerpc_connection *c, DATA_BLOB *session_key)
 375 {
 376         struct smb2_private *smb = talloc_get_type(c->transport.private_data,
 377                                                    struct smb2_private);
 378         *session_key = smb->tree->session->session_key;
 379         if (session_key->data == NULL) {
 380                 return NT_STATUS_NO_USER_SESSION_KEY;
 381         }
 382         return NT_STATUS_OK;
 383 }
 384
 385 struct pipe_open_smb2_state {
 386         struct dcerpc_connection *c;
 387         struct composite_context *ctx;
 388 };
 389
 390 static void pipe_open_recv(struct smb2_request *req);
 391
 392 struct composite_context *dcerpc_pipe_open_smb2_send(struct dcerpc_pipe *p,
 393                                                      struct smb2_tree *tree,
 394                                                      const char *pipe_name)
 395 {
 396         struct composite_context *ctx;
 397         struct pipe_open_smb2_state *state;
 398         struct smb2_create io;
 399         struct smb2_request *req;
 400         struct dcerpc_connection *c = p->conn;
 401
 402         ctx = composite_create(c, c->event_ctx);
 403         if (ctx == NULL) return NULL;
 404
 405         state = talloc(ctx, struct pipe_open_smb2_state);
 406         if (composite_nomem(state, ctx)) return ctx;
 407         ctx->private_data = state;
 408
 409         state->c = c;
 410         state->ctx = ctx;
 411
 412         ZERO_STRUCT(io);
 413         io.in.desired_access =
 414                 SEC_STD_READ_CONTROL |
 415                 SEC_FILE_READ_ATTRIBUTE |
 416                 SEC_FILE_WRITE_ATTRIBUTE |
 417                 SEC_STD_SYNCHRONIZE |
 418                 SEC_FILE_READ_EA |
 419                 SEC_FILE_WRITE_EA |
 420                 SEC_FILE_READ_DATA |
 421                 SEC_FILE_WRITE_DATA |
 422                 SEC_FILE_APPEND_DATA;
 423         io.in.share_access =
 424                 NTCREATEX_SHARE_ACCESS_READ |
 425                 NTCREATEX_SHARE_ACCESS_WRITE;
 426         io.in.create_disposition = NTCREATEX_DISP_OPEN;
 427         io.in.create_options   =
 428                 NTCREATEX_OPTIONS_NON_DIRECTORY_FILE |
 429                 NTCREATEX_OPTIONS_UNKNOWN_400000;
 430         io.in.impersonation_level = NTCREATEX_IMPERSONATION_IMPERSONATION;
 431
 432         if ((strncasecmp(pipe_name, "/pipe/", 6) == 0) ||
 433             (strncasecmp(pipe_name, "\\pipe\\", 6) == 0)) {
 434                 pipe_name += 6;
 435         }
 436         io.in.fname = pipe_name;
 437
 438         req = smb2_create_send(tree, &io);
 439         composite_continue_smb2(ctx, req, pipe_open_recv, state);
 440         return ctx;
 441 }
 442
 443 static void pipe_open_recv(struct smb2_request *req)
 444 {
 445         struct pipe_open_smb2_state *state =
 446                 talloc_get_type(req->async.private,
 447                                 struct pipe_open_smb2_state);
 448         struct composite_context *ctx = state->ctx;
 449         struct dcerpc_connection *c = state->c;
 450         struct smb2_tree *tree = req->tree;
 451         struct smb2_private *smb;
 452         struct smb2_create io;
 453
 454         ctx->status = smb2_create_recv(req, state, &io);
 455         if (!composite_is_ok(ctx)) return;
 456
 457         /*
 458           fill in the transport methods
 459         */
 460         c->transport.transport = NCACN_NP;
 461         c->transport.private_data = NULL;
 462         c->transport.shutdown_pipe = smb2_shutdown_pipe;
 463         c->transport.peer_name = smb2_peer_name;
 464         c->transport.target_hostname = smb2_target_hostname;
 465
 466         c->transport.send_request = smb2_send_request;
 467         c->transport.send_read = send_read_request;
 468         c->transport.recv_data = NULL;
 469
 470         /* Over-ride the default session key with the SMB session key */
 471         c->security_state.session_key = smb2_session_key;
 472
 473         smb = talloc(c, struct smb2_private);
 474         if (composite_nomem(smb, ctx)) return;
 475
 476         smb->handle     = io.out.file.handle;
 477         smb->tree       = talloc_reference(smb, tree);
 478         smb->server_name= strupper_talloc(smb,
 479                                           tree->session->transport->socket->hostname);
 480         if (composite_nomem(smb->server_name, ctx)) return;
 481         smb->dead       = false;
 482
 483         c->transport.private_data = smb;
 484
 485         composite_done(ctx);
 486 }
 487
 488 NTSTATUS dcerpc_pipe_open_smb2_recv(struct composite_context *c)
 489 {
 490         NTSTATUS status = composite_wait(c);
 491         talloc_free(c);
 492         return status;
 493 }
 494
 495 NTSTATUS dcerpc_pipe_open_smb2(struct dcerpc_pipe *p,
 496                                struct smb2_tree *tree,
 497                                const char *pipe_name)
 498 {
 499         struct composite_context *ctx = dcerpc_pipe_open_smb2_send(p, tree, pipe_name);
 500         return dcerpc_pipe_open_smb2_recv(ctx);
 501 }
 502
 503 /*
 504   return the SMB2 tree used for a dcerpc over SMB2 pipe
 505 */
 506 struct smb2_tree *dcerpc_smb2_tree(struct dcerpc_connection *c)
 507 {
 508         struct smb2_private *smb = talloc_get_type(c->transport.private_data,
 509                                                    struct smb2_private);
 510         return smb->tree;
 511 }