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