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 #include "librpc/rpc/dcerpc_proto.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         bool dead;
  37 };
  38
  39
  40 /*
  41   tell the dcerpc layer that the transport is dead
  42 */
  43 static void pipe_dead(struct dcerpc_connection *c, NTSTATUS status)
  44 {
  45         struct smb2_private *smb = (struct smb2_private *)c->transport.private_data;
  46
  47         if (smb->dead) {
  48                 return;
  49         }
  50
  51         smb->dead = true;
  52
  53         if (NT_STATUS_EQUAL(NT_STATUS_UNSUCCESSFUL, status)) {
  54                 status = NT_STATUS_UNEXPECTED_NETWORK_ERROR;
  55         }
  56
  57         if (NT_STATUS_EQUAL(NT_STATUS_OK, status)) {
  58                 status = NT_STATUS_END_OF_FILE;
  59         }
  60
  61         if (c->transport.recv_data) {
  62                 c->transport.recv_data(c, NULL, status);
  63         }
  64 }
  65
  66
  67 /*
  68    this holds the state of an in-flight call
  69 */
  70 struct smb2_read_state {
  71         struct dcerpc_connection *c;
  72         DATA_BLOB data;
  73 };
  74
  75 /*
  76   called when a read request has completed
  77 */
  78 static void smb2_read_callback(struct smb2_request *req)
  79 {
  80         struct smb2_private *smb;
  81         struct smb2_read_state *state;
  82         struct smb2_read io;
  83         uint16_t frag_length;
  84         NTSTATUS status;
  85
  86         state = talloc_get_type(req->async.private_data, struct smb2_read_state);
  87         smb = talloc_get_type(state->c->transport.private_data, struct smb2_private);
  88
  89         status = smb2_read_recv(req, state, &io);
  90         if (NT_STATUS_IS_ERR(status)) {
  91                 pipe_dead(state->c, status);
  92                 talloc_free(state);
  93                 return;
  94         }
  95
  96         if (!data_blob_append(state, &state->data,
  97                                   io.out.data.data, io.out.data.length)) {
  98                 pipe_dead(state->c, NT_STATUS_NO_MEMORY);
  99                 talloc_free(state);
 100                 return;
 101         }
 102
 103         if (state->data.length < 16) {
 104                 DEBUG(0,("dcerpc_smb2: short packet (length %d) in read callback!\n",
 105                          (int)state->data.length));
 106                 pipe_dead(state->c, NT_STATUS_INFO_LENGTH_MISMATCH);
 107                 talloc_free(state);
 108                 return;
 109         }
 110
 111         frag_length = dcerpc_get_frag_length(&state->data);
 112
 113         if (frag_length <= state->data.length) {
 114                 DATA_BLOB data = state->data;
 115                 struct dcerpc_connection *c = state->c;
 116                 talloc_steal(c, data.data);
 117                 talloc_free(state);
 118                 c->transport.recv_data(c, &data, NT_STATUS_OK);
 119                 return;
 120         }
 121
 122         /* initiate another read request, as we only got part of a fragment */
 123         ZERO_STRUCT(io);
 124         io.in.file.handle = smb->handle;
 125         io.in.length = MIN(state->c->srv_max_xmit_frag,
 126                            frag_length - state->data.length);
 127         if (io.in.length < 16) {
 128                 io.in.length = 16;
 129         }
 130
 131         req = smb2_read_send(smb->tree, &io);
 132         if (req == NULL) {
 133                 pipe_dead(state->c, NT_STATUS_NO_MEMORY);
 134                 talloc_free(state);
 135                 return;
 136         }
 137
 138         req->async.fn = smb2_read_callback;
 139         req->async.private_data = state;
 140 }
 141
 142
 143 /*
 144   trigger a read request from the server, possibly with some initial
 145   data in the read buffer
 146 */
 147 static NTSTATUS send_read_request_continue(struct dcerpc_connection *c, DATA_BLOB *blob)
 148 {
 149         struct smb2_private *smb = (struct smb2_private *)c->transport.private_data;
 150         struct smb2_read io;
 151         struct smb2_read_state *state;
 152         struct smb2_request *req;
 153
 154         state = talloc(smb, struct smb2_read_state);
 155         if (state == NULL) {
 156                 return NT_STATUS_NO_MEMORY;
 157         }
 158
 159         state->c = c;
 160         if (blob == NULL) {
 161                 state->data = data_blob(NULL, 0);
 162         } else {
 163                 state->data = *blob;
 164                 talloc_steal(state, state->data.data);
 165         }
 166
 167         ZERO_STRUCT(io);
 168         io.in.file.handle = smb->handle;
 169
 170         if (state->data.length >= 16) {
 171                 uint16_t frag_length = dcerpc_get_frag_length(&state->data);
 172                 io.in.length = frag_length - state->data.length;
 173         } else {
 174                 io.in.length = 0x2000;
 175         }
 176
 177         req = smb2_read_send(smb->tree, &io);
 178         if (req == NULL) {
 179                 return NT_STATUS_NO_MEMORY;
 180         }
 181
 182         req->async.fn = smb2_read_callback;
 183         req->async.private_data = state;
 184
 185         return NT_STATUS_OK;
 186 }
 187
 188
 189 /*
 190   trigger a read request from the server
 191 */
 192 static NTSTATUS send_read_request(struct dcerpc_connection *c)
 193 {
 194         struct smb2_private *smb = (struct smb2_private *)c->transport.private_data;
 195
 196         if (smb->dead) {
 197                 return NT_STATUS_CONNECTION_DISCONNECTED;
 198         }
 199
 200         return send_read_request_continue(c, NULL);
 201 }
 202
 203 /*
 204    this holds the state of an in-flight trans call
 205 */
 206 struct smb2_trans_state {
 207         struct dcerpc_connection *c;
 208 };
 209
 210 /*
 211   called when a trans request has completed
 212 */
 213 static void smb2_trans_callback(struct smb2_request *req)
 214 {
 215         struct smb2_trans_state *state = talloc_get_type(req->async.private_data,
 216                                                         struct smb2_trans_state);
 217         struct dcerpc_connection *c = state->c;
 218         NTSTATUS status;
 219         struct smb2_ioctl io;
 220
 221         status = smb2_ioctl_recv(req, state, &io);
 222         if (NT_STATUS_IS_ERR(status)) {
 223                 pipe_dead(c, status);
 224                 return;
 225         }
 226
 227         if (!NT_STATUS_EQUAL(status, STATUS_BUFFER_OVERFLOW)) {
 228                 DATA_BLOB data = io.out.out;
 229                 talloc_steal(c, data.data);
 230                 talloc_free(state);
 231                 c->transport.recv_data(c, &data, NT_STATUS_OK);
 232                 return;
 233         }
 234
 235         /* there is more to receive - setup a read */
 236         send_read_request_continue(c, &io.out.out);
 237         talloc_free(state);
 238 }
 239
 240 /*
 241   send a SMBtrans style request, using a named pipe read_write fsctl
 242 */
 243 static NTSTATUS smb2_send_trans_request(struct dcerpc_connection *c, DATA_BLOB *blob)
 244 {
 245         struct smb2_private *smb = talloc_get_type(c->transport.private_data,
 246                                                    struct smb2_private);
 247         struct smb2_ioctl io;
 248         struct smb2_trans_state *state;
 249         struct smb2_request *req;
 250
 251         state = talloc(smb, struct smb2_trans_state);
 252         if (state == NULL) {
 253                 return NT_STATUS_NO_MEMORY;
 254         }
 255
 256         state->c = c;
 257
 258         ZERO_STRUCT(io);
 259         io.in.file.handle       = smb->handle;
 260         io.in.function          = FSCTL_NAMED_PIPE_READ_WRITE;
 261         io.in.max_response_size = 0x2000;
 262         io.in.flags             = 1;
 263         io.in.out               = *blob;
 264
 265         req = smb2_ioctl_send(smb->tree, &io);
 266         if (req == NULL) {
 267                 talloc_free(state);
 268                 return NT_STATUS_NO_MEMORY;
 269         }
 270
 271         req->async.fn = smb2_trans_callback;
 272         req->async.private_data = state;
 273
 274         talloc_steal(state, req);
 275
 276         return NT_STATUS_OK;
 277 }
 278
 279 /*
 280   called when a write request has completed
 281 */
 282 static void smb2_write_callback(struct smb2_request *req)
 283 {
 284         struct dcerpc_connection *c = (struct dcerpc_connection *)req->async.private_data;
 285
 286         if (!NT_STATUS_IS_OK(req->status)) {
 287                 DEBUG(0,("dcerpc_smb2: write callback error\n"));
 288                 pipe_dead(c, req->status);
 289         }
 290
 291         smb2_request_destroy(req);
 292 }
 293
 294 /*
 295    send a packet to the server
 296 */
 297 static NTSTATUS smb2_send_request(struct dcerpc_connection *c, DATA_BLOB *blob,
 298                                   bool trigger_read)
 299 {
 300         struct smb2_private *smb = (struct smb2_private *)c->transport.private_data;
 301         struct smb2_write io;
 302         struct smb2_request *req;
 303
 304         if (smb->dead) {
 305                 return NT_STATUS_CONNECTION_DISCONNECTED;
 306         }
 307
 308         if (trigger_read) {
 309                 return smb2_send_trans_request(c, blob);
 310         }
 311
 312         ZERO_STRUCT(io);
 313         io.in.file.handle       = smb->handle;
 314         io.in.data              = *blob;
 315
 316         req = smb2_write_send(smb->tree, &io);
 317         if (req == NULL) {
 318                 return NT_STATUS_NO_MEMORY;
 319         }
 320
 321         req->async.fn = smb2_write_callback;
 322         req->async.private_data = c;
 323
 324         return NT_STATUS_OK;
 325 }
 326
 327 static void free_request(struct smb2_request *req)
 328 {
 329         talloc_free(req);
 330 }
 331
 332 /*
 333    shutdown SMB pipe connection
 334 */
 335 static NTSTATUS smb2_shutdown_pipe(struct dcerpc_connection *c, NTSTATUS status)
 336 {
 337         struct smb2_private *smb = (struct smb2_private *)c->transport.private_data;
 338         struct smb2_close io;
 339         struct smb2_request *req;
 340
 341         /* maybe we're still starting up */
 342         if (!smb) return status;
 343
 344         ZERO_STRUCT(io);
 345         io.in.file.handle = smb->handle;
 346         req = smb2_close_send(smb->tree, &io);
 347         if (req != NULL) {
 348                 /* we don't care if this fails, so just free it if it succeeds */
 349                 req->async.fn = free_request;
 350         }
 351
 352         talloc_free(smb);
 353
 354         return status;
 355 }
 356
 357 /*
 358   return SMB server name
 359 */
 360 static const char *smb2_peer_name(struct dcerpc_connection *c)
 361 {
 362         struct smb2_private *smb = talloc_get_type(c->transport.private_data,
 363                                                    struct smb2_private);
 364         return smb->server_name;
 365 }
 366
 367 /*
 368   return remote name we make the actual connection (good for kerberos)
 369 */
 370 static const char *smb2_target_hostname(struct dcerpc_connection *c)
 371 {
 372         struct smb2_private *smb = talloc_get_type(c->transport.private_data,
 373                                                    struct smb2_private);
 374         return smb->tree->session->transport->socket->hostname;
 375 }
 376
 377 /*
 378   fetch the user session key
 379 */
 380 static NTSTATUS smb2_session_key(struct dcerpc_connection *c, DATA_BLOB *session_key)
 381 {
 382         struct smb2_private *smb = talloc_get_type(c->transport.private_data,
 383                                                    struct smb2_private);
 384         *session_key = smb->tree->session->session_key;
 385         if (session_key->data == NULL) {
 386                 return NT_STATUS_NO_USER_SESSION_KEY;
 387         }
 388         return NT_STATUS_OK;
 389 }
 390
 391 struct pipe_open_smb2_state {
 392         struct dcerpc_connection *c;
 393         struct composite_context *ctx;
 394 };
 395
 396 static void pipe_open_recv(struct smb2_request *req);
 397
 398 struct composite_context *dcerpc_pipe_open_smb2_send(struct dcerpc_pipe *p,
 399                                                      struct smb2_tree *tree,
 400                                                      const char *pipe_name)
 401 {
 402         struct composite_context *ctx;
 403         struct pipe_open_smb2_state *state;
 404         struct smb2_create io;
 405         struct smb2_request *req;
 406         struct dcerpc_connection *c = p->conn;
 407
 408         ctx = composite_create(c, c->event_ctx);
 409         if (ctx == NULL) return NULL;
 410
 411         state = talloc(ctx, struct pipe_open_smb2_state);
 412         if (composite_nomem(state, ctx)) return ctx;
 413         ctx->private_data = state;
 414
 415         state->c = c;
 416         state->ctx = ctx;
 417
 418         ZERO_STRUCT(io);
 419         io.in.desired_access =
 420                 SEC_STD_READ_CONTROL |
 421                 SEC_FILE_READ_ATTRIBUTE |
 422                 SEC_FILE_WRITE_ATTRIBUTE |
 423                 SEC_STD_SYNCHRONIZE |
 424                 SEC_FILE_READ_EA |
 425                 SEC_FILE_WRITE_EA |
 426                 SEC_FILE_READ_DATA |
 427                 SEC_FILE_WRITE_DATA |
 428                 SEC_FILE_APPEND_DATA;
 429         io.in.share_access =
 430                 NTCREATEX_SHARE_ACCESS_READ |
 431                 NTCREATEX_SHARE_ACCESS_WRITE;
 432         io.in.create_disposition = NTCREATEX_DISP_OPEN;
 433         io.in.create_options   =
 434                 NTCREATEX_OPTIONS_NON_DIRECTORY_FILE |
 435                 NTCREATEX_OPTIONS_NO_RECALL;
 436         io.in.impersonation_level = NTCREATEX_IMPERSONATION_IMPERSONATION;
 437
 438         if ((strncasecmp(pipe_name, "/pipe/", 6) == 0) ||
 439             (strncasecmp(pipe_name, "\\pipe\\", 6) == 0)) {
 440                 pipe_name += 6;
 441         }
 442         io.in.fname = pipe_name;
 443
 444         req = smb2_create_send(tree, &io);
 445         composite_continue_smb2(ctx, req, pipe_open_recv, state);
 446         return ctx;
 447 }
 448
 449 static void pipe_open_recv(struct smb2_request *req)
 450 {
 451         struct pipe_open_smb2_state *state =
 452                 talloc_get_type(req->async.private_data,
 453                                 struct pipe_open_smb2_state);
 454         struct composite_context *ctx = state->ctx;
 455         struct dcerpc_connection *c = state->c;
 456         struct smb2_tree *tree = req->tree;
 457         struct smb2_private *smb;
 458         struct smb2_create io;
 459
 460         ctx->status = smb2_create_recv(req, state, &io);
 461         if (!composite_is_ok(ctx)) return;
 462
 463         /*
 464           fill in the transport methods
 465         */
 466         c->transport.transport = NCACN_NP;
 467         c->transport.private_data = NULL;
 468         c->transport.shutdown_pipe = smb2_shutdown_pipe;
 469         c->transport.peer_name = smb2_peer_name;
 470         c->transport.target_hostname = smb2_target_hostname;
 471
 472         c->transport.send_request = smb2_send_request;
 473         c->transport.send_read = send_read_request;
 474         c->transport.recv_data = NULL;
 475
 476         /* Over-ride the default session key with the SMB session key */
 477         c->security_state.session_key = smb2_session_key;
 478
 479         smb = talloc(c, struct smb2_private);
 480         if (composite_nomem(smb, ctx)) return;
 481
 482         smb->handle     = io.out.file.handle;
 483         smb->tree       = talloc_reference(smb, tree);
 484         smb->server_name= strupper_talloc(smb,
 485                                           tree->session->transport->socket->hostname);
 486         if (composite_nomem(smb->server_name, ctx)) return;
 487         smb->dead       = false;
 488
 489         c->transport.private_data = smb;
 490
 491         composite_done(ctx);
 492 }
 493
 494 NTSTATUS dcerpc_pipe_open_smb2_recv(struct composite_context *c)
 495 {
 496         NTSTATUS status = composite_wait(c);
 497         talloc_free(c);
 498         return status;
 499 }
 500
 501 NTSTATUS dcerpc_pipe_open_smb2(struct dcerpc_pipe *p,
 502                                struct smb2_tree *tree,
 503                                const char *pipe_name)
 504 {
 505         struct composite_context *ctx = dcerpc_pipe_open_smb2_send(p, tree, pipe_name);
 506         return dcerpc_pipe_open_smb2_recv(ctx);
 507 }
 508
 509 /*
 510   return the SMB2 tree used for a dcerpc over SMB2 pipe
 511 */
 512 struct smb2_tree *dcerpc_smb2_tree(struct dcerpc_connection *c)
 513 {
 514         struct smb2_private *smb = talloc_get_type(c->transport.private_data,
 515                                                    struct smb2_private);
 516         return smb->tree;
 517 }