source/libcli/raw/rawtrans.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    raw trans/trans2/nttrans operations
   4
   5    Copyright (C) James Myers 2003 <myersjj@samba.org>
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20 */
  21
  22 #include "includes.h"
  23
  24
  25 /*
  26   check out of bounds for incoming data
  27 */
  28 static BOOL raw_trans_oob(struct cli_request *req,
  29                           uint_t offset, uint_t count)
  30 {
  31         char *ptr;
  32
  33         if (count == 0) {
  34                 return False;
  35         }
  36
  37         ptr = req->in.hdr + offset;
  38
  39         /* be careful with wraparound! */
  40         if (ptr < req->in.data ||
  41             ptr >= req->in.data + req->in.data_size ||
  42             count > req->in.data_size ||
  43             ptr + count > req->in.data + req->in.data_size) {
  44                 return True;
  45         }
  46         return False;
  47 }
  48
  49 /****************************************************************************
  50   receive a SMB trans or trans2 response allocating the necessary memory
  51   ****************************************************************************/
  52 NTSTATUS smb_raw_trans2_recv(struct cli_request *req,
  53                              TALLOC_CTX *mem_ctx,
  54                              struct smb_trans2 *parms)
  55 {
  56         int total_data=0;
  57         int total_param=0;
  58         char *tdata;
  59         char *tparam;
  60
  61         parms->out.data.length = 0;
  62         parms->out.data.data = NULL;
  63         parms->out.params.length = 0;
  64         parms->out.params.data = NULL;
  65
  66         if (!cli_request_receive(req)) {
  67                 return cli_request_destroy(req);
  68         }
  69
  70         /*
  71          * An NT RPC pipe call can return ERRDOS, ERRmoredata
  72          * to a trans call. This is not an error and should not
  73          * be treated as such.
  74          */
  75         if (NT_STATUS_IS_ERR(req->status)) {
  76                 return cli_request_destroy(req);
  77         }
  78
  79         CLI_CHECK_MIN_WCT(req, 10);
  80
  81         /* parse out the lengths */
  82         total_data = SVAL(req->in.vwv, VWV(1));
  83         total_param = SVAL(req->in.vwv, VWV(0));
  84
  85         /* allocate it */
  86         if (total_data != 0) {
  87                 tdata = talloc_realloc(mem_ctx, parms->out.data.data,total_data);
  88                 if (!tdata) {
  89                         DEBUG(0,("smb_raw_receive_trans: failed to enlarge data buffer to %d bytes\n", total_data));
  90                         req->status = NT_STATUS_NO_MEMORY;
  91                         return cli_request_destroy(req);
  92                 }
  93                 parms->out.data.data = tdata;
  94         }
  95
  96         if (total_param != 0) {
  97                 tparam = talloc_realloc(mem_ctx, parms->out.params.data,total_param);
  98                 if (!tparam) {
  99                         DEBUG(0,("smb_raw_receive_trans: failed to enlarge param buffer to %d bytes\n", total_param));
 100                         req->status = NT_STATUS_NO_MEMORY;
 101                         return cli_request_destroy(req);
 102                 }
 103                 parms->out.params.data = tparam;
 104         }
 105
 106         parms->out.setup_count = SVAL(req->in.vwv, VWV(9));
 107         CLI_CHECK_WCT(req, 10 + parms->out.setup_count);
 108
 109         if (parms->out.setup_count > 0) {
 110                 int i;
 111                 parms->out.setup = talloc(mem_ctx, 2 * parms->out.setup_count);
 112                 if (!parms->out.setup) {
 113                         req->status = NT_STATUS_NO_MEMORY;
 114                         return cli_request_destroy(req);
 115                 }
 116                 for (i=0;i<parms->out.setup_count;i++) {
 117                         parms->out.setup[i] = SVAL(req->in.vwv, VWV(10+i));
 118                 }
 119         }
 120
 121         while (1)  {
 122                 uint16_t param_count, param_ofs, param_disp;
 123                 uint16_t data_count, data_ofs, data_disp;
 124                 uint16_t total_data2, total_param2;
 125
 126                 /* parse out the total lengths again - they can shrink! */
 127                 total_data2 = SVAL(req->in.vwv, VWV(1));
 128                 total_param2 = SVAL(req->in.vwv, VWV(0));
 129
 130                 if (total_data2 > total_data ||
 131                     total_param2 > total_param) {
 132                         /* they must *only* shrink */
 133                         DEBUG(1,("smb_raw_receive_trans: data/params expanded!\n"));
 134                         req->status = NT_STATUS_BUFFER_TOO_SMALL;
 135                         return cli_request_destroy(req);
 136                 }
 137
 138                 total_data = total_data2;
 139                 total_param = total_param2;
 140
 141                 /* parse params for this lump */
 142                 param_count = SVAL(req->in.vwv, VWV(3));
 143                 param_ofs   = SVAL(req->in.vwv, VWV(4));
 144                 param_disp  = SVAL(req->in.vwv, VWV(5));
 145
 146                 data_count = SVAL(req->in.vwv, VWV(6));
 147                 data_ofs   = SVAL(req->in.vwv, VWV(7));
 148                 data_disp  = SVAL(req->in.vwv, VWV(8));
 149
 150                 if (data_count + data_disp > total_data ||
 151                     param_count + param_disp > total_param) {
 152                         DEBUG(1,("smb_raw_receive_trans: Buffer overflow\n"));
 153                         req->status = NT_STATUS_BUFFER_TOO_SMALL;
 154                         return cli_request_destroy(req);
 155                 }
 156
 157                 /* check the server isn't being nasty */
 158                 if (raw_trans_oob(req, param_ofs, param_count) ||
 159                     raw_trans_oob(req, data_ofs, data_count)) {
 160                         DEBUG(1,("smb_raw_receive_trans: out of bounds parameters!\n"));
 161                         req->status = NT_STATUS_BUFFER_TOO_SMALL;
 162                         return cli_request_destroy(req);
 163                 }
 164
 165                 if (data_count) {
 166                         memcpy(parms->out.data.data + data_disp,
 167                                req->in.hdr + data_ofs,
 168                                data_count);
 169                 }
 170
 171                 if (param_count) {
 172                         memcpy(parms->out.params.data + param_disp,
 173                                req->in.hdr + param_ofs,
 174                                param_count);
 175                 }
 176
 177                 parms->out.data.length += data_count;
 178                 parms->out.params.length += param_count;
 179
 180                 if (total_data <= parms->out.data.length && total_param <= parms->out.params.length)
 181                         break;
 182
 183                 /* to receive more requests we need to mark this request as not received */
 184                 req->in.buffer = NULL;
 185
 186                 if (!cli_request_receive(req)) {
 187                         req->status = NT_STATUS_UNSUCCESSFUL;
 188                         return cli_request_destroy(req);
 189                 }
 190         }
 191
 192 failed:
 193         return cli_request_destroy(req);
 194 }
 195
 196 NTSTATUS smb_raw_trans_recv(struct cli_request *req,
 197                              TALLOC_CTX *mem_ctx,
 198                              struct smb_trans2 *parms)
 199 {
 200         return smb_raw_trans2_recv(req, mem_ctx, parms);
 201 }
 202
 203 /****************************************************************************
 204  trans/trans2 raw async interface - only BLOBs used in this interface.
 205  note that this doesn't yet support multi-part requests
 206 ****************************************************************************/
 207 struct cli_request *smb_raw_trans_send_backend(struct cli_tree *tree,
 208                                                struct smb_trans2 *parms,
 209                                                uint8_t command)
 210 {
 211         int wct = 14 + parms->in.setup_count;
 212         struct cli_request *req;
 213         char *outdata,*outparam;
 214         int i;
 215         int padding;
 216         size_t namelen = 0;
 217
 218         if (command == SMBtrans)
 219                 padding = 1;
 220         else
 221                 padding = 3;
 222
 223         req = cli_request_setup(tree, command, wct, padding);
 224         if (!req) {
 225                 return NULL;
 226         }
 227
 228         /* fill in SMB parameters */
 229         outparam = req->out.data + padding;
 230         outdata = outparam + parms->in.params.length;
 231
 232         /* make sure we don't leak data via the padding */
 233         memset(req->out.data, 0, padding);
 234
 235         if (command == SMBtrans && parms->in.trans_name) {
 236                 namelen = cli_req_append_string(req, parms->in.trans_name,
 237                                                 STR_TERMINATE);
 238         }
 239
 240         /* primary request */
 241         SSVAL(req->out.vwv,VWV(0),parms->in.params.length);
 242         SSVAL(req->out.vwv,VWV(1),parms->in.data.length);
 243         SSVAL(req->out.vwv,VWV(2),parms->in.max_param);
 244         SSVAL(req->out.vwv,VWV(3),parms->in.max_data);
 245         SSVAL(req->out.vwv,VWV(4),parms->in.max_setup);
 246         SSVAL(req->out.vwv,VWV(5),parms->in.flags);
 247         SIVAL(req->out.vwv,VWV(6),parms->in.timeout);
 248         SSVAL(req->out.vwv,VWV(8),0); /* reserved */
 249         SSVAL(req->out.vwv,VWV(9),parms->in.params.length);
 250         SSVAL(req->out.vwv,VWV(10),PTR_DIFF(outparam,req->out.hdr)+namelen);
 251         SSVAL(req->out.vwv,VWV(11),parms->in.data.length);
 252         SSVAL(req->out.vwv,VWV(12),PTR_DIFF(outdata,req->out.hdr)+namelen);
 253         SSVAL(req->out.vwv,VWV(13),parms->in.setup_count);
 254         for (i=0;i<parms->in.setup_count;i++)   {
 255                 SSVAL(req->out.vwv,VWV(14)+i*2,parms->in.setup[i]);
 256         }
 257         if (parms->in.params.data)      {
 258                 cli_req_append_blob(req, &parms->in.params);
 259         }
 260         if (parms->in.data.data) {
 261                 cli_req_append_blob(req, &parms->in.data);
 262         }
 263
 264         if (!cli_request_send(req)) {
 265                 cli_request_destroy(req);
 266                 return NULL;
 267         }
 268
 269         return req;
 270 }
 271
 272 /****************************************************************************
 273  trans/trans2 raw async interface - only BLOBs used in this interface.
 274 note that this doesn't yet support multi-part requests
 275 ****************************************************************************/
 276
 277 struct cli_request *smb_raw_trans_send(struct cli_tree *tree,
 278                                        struct smb_trans2 *parms)
 279 {
 280         return smb_raw_trans_send_backend(tree, parms, SMBtrans);
 281 }
 282
 283 struct cli_request *smb_raw_trans2_send(struct cli_tree *tree,
 284                                        struct smb_trans2 *parms)
 285 {
 286         return smb_raw_trans_send_backend(tree, parms, SMBtrans2);
 287 }
 288
 289 /*
 290   trans2 synchronous blob interface
 291 */
 292 NTSTATUS smb_raw_trans2(struct cli_tree *tree,
 293                         TALLOC_CTX *mem_ctx,
 294                         struct smb_trans2 *parms)
 295 {
 296         struct cli_request *req;
 297         req = smb_raw_trans2_send(tree, parms);
 298         if (!req) return NT_STATUS_UNSUCCESSFUL;
 299         return smb_raw_trans2_recv(req, mem_ctx, parms);
 300 }
 301
 302
 303 /*
 304   trans synchronous blob interface
 305 */
 306 NTSTATUS smb_raw_trans(struct cli_tree *tree,
 307                        TALLOC_CTX *mem_ctx,
 308                        struct smb_trans2 *parms)
 309 {
 310         struct cli_request *req;
 311         req = smb_raw_trans_send(tree, parms);
 312         if (!req) return NT_STATUS_UNSUCCESSFUL;
 313         return smb_raw_trans_recv(req, mem_ctx, parms);
 314 }
 315
 316 /****************************************************************************
 317   receive a SMB nttrans response allocating the necessary memory
 318   ****************************************************************************/
 319 NTSTATUS smb_raw_nttrans_recv(struct cli_request *req,
 320                               TALLOC_CTX *mem_ctx,
 321                               struct smb_nttrans *parms)
 322 {
 323         uint32_t total_data, recvd_data=0;
 324         uint32_t total_param, recvd_param=0;
 325
 326         if (!cli_request_receive(req) ||
 327             cli_request_is_error(req)) {
 328                 return cli_request_destroy(req);
 329         }
 330
 331         /* sanity check */
 332         if (CVAL(req->in.hdr, HDR_COM) != SMBnttrans) {
 333                 DEBUG(0,("smb_raw_receive_nttrans: Expected %s response, got command 0x%02x\n",
 334                          "SMBnttrans",
 335                          CVAL(req->in.hdr,HDR_COM)));
 336                 req->status = NT_STATUS_UNSUCCESSFUL;
 337                 return cli_request_destroy(req);
 338         }
 339
 340         CLI_CHECK_MIN_WCT(req, 18);
 341
 342         /* parse out the lengths */
 343         total_param = IVAL(req->in.vwv, 3);
 344         total_data  = IVAL(req->in.vwv, 7);
 345
 346         parms->out.data = data_blob_talloc(mem_ctx, NULL, total_data);
 347         parms->out.params = data_blob_talloc(mem_ctx, NULL, total_param);
 348
 349         if (parms->out.data.length != total_data ||
 350             parms->out.params.length != total_param) {
 351                 req->status = NT_STATUS_NO_MEMORY;
 352                 return cli_request_destroy(req);
 353         }
 354
 355         parms->out.setup_count = CVAL(req->in.vwv, 35);
 356         CLI_CHECK_WCT(req, 18 + parms->out.setup_count);
 357
 358         if (parms->out.setup_count > 0) {
 359                 int i;
 360                 parms->out.setup = talloc(mem_ctx, 2 * parms->out.setup_count);
 361                 if (!parms->out.setup) {
 362                         req->status = NT_STATUS_NO_MEMORY;
 363                         return cli_request_destroy(req);
 364                 }
 365                 for (i=0;i<parms->out.setup_count;i++) {
 366                         parms->out.setup[i] = SVAL(req->in.vwv, VWV(18+i));
 367                 }
 368         }
 369
 370         while (recvd_data < total_data ||
 371                recvd_param < total_param)  {
 372                 uint32_t param_count, param_ofs, param_disp;
 373                 uint32_t data_count, data_ofs, data_disp;
 374                 uint32_t total_data2, total_param2;
 375
 376                 /* parse out the total lengths again - they can shrink! */
 377                 total_param2 = IVAL(req->in.vwv, 3);
 378                 total_data2  = IVAL(req->in.vwv, 7);
 379
 380                 if (total_data2 > total_data ||
 381                     total_param2 > total_param) {
 382                         /* they must *only* shrink */
 383                         DEBUG(1,("smb_raw_receive_nttrans: data/params expanded!\n"));
 384                         req->status = NT_STATUS_BUFFER_TOO_SMALL;
 385                         return cli_request_destroy(req);
 386                 }
 387
 388                 total_data = total_data2;
 389                 total_param = total_param2;
 390                 parms->out.data.length = total_data;
 391                 parms->out.params.length = total_param;
 392
 393                 /* parse params for this lump */
 394                 param_count = IVAL(req->in.vwv, 11);
 395                 param_ofs   = IVAL(req->in.vwv, 15);
 396                 param_disp  = IVAL(req->in.vwv, 19);
 397
 398                 data_count = IVAL(req->in.vwv, 23);
 399                 data_ofs   = IVAL(req->in.vwv, 27);
 400                 data_disp  = IVAL(req->in.vwv, 31);
 401
 402                 if (data_count + data_disp > total_data ||
 403                     param_count + param_disp > total_param) {
 404                         DEBUG(1,("smb_raw_receive_nttrans: Buffer overflow\n"));
 405                         req->status = NT_STATUS_BUFFER_TOO_SMALL;
 406                         return cli_request_destroy(req);
 407                 }
 408
 409                 /* check the server isn't being nasty */
 410                 if (raw_trans_oob(req, param_ofs, param_count) ||
 411                     raw_trans_oob(req, data_ofs, data_count)) {
 412                         DEBUG(1,("smb_raw_receive_nttrans: out of bounds parameters!\n"));
 413                         req->status = NT_STATUS_BUFFER_TOO_SMALL;
 414                         return cli_request_destroy(req);
 415                 }
 416
 417                 if (data_count) {
 418                         memcpy(parms->out.data.data + data_disp,
 419                                req->in.hdr + data_ofs,
 420                                data_count);
 421                 }
 422
 423                 if (param_count) {
 424                         memcpy(parms->out.params.data + param_disp,
 425                                req->in.hdr + param_ofs,
 426                                param_count);
 427                 }
 428
 429                 recvd_param += param_count;
 430                 recvd_data += data_count;
 431
 432                 if (recvd_data >= total_data &&
 433                     recvd_param >= total_param) {
 434                         break;
 435                 }
 436
 437                 if (!cli_request_receive(req) ||
 438                     cli_request_is_error(req)) {
 439                         return cli_request_destroy(req);
 440                 }
 441
 442                 /* sanity check */
 443                 if (CVAL(req->in.hdr, HDR_COM) != SMBnttrans) {
 444                         DEBUG(0,("smb_raw_receive_nttrans: Expected nttranss, got command 0x%02x\n",
 445                                  CVAL(req->in.hdr, HDR_COM)));
 446                         req->status = NT_STATUS_UNSUCCESSFUL;
 447                         return cli_request_destroy(req);
 448                 }
 449         }
 450
 451 failed:
 452         return cli_request_destroy(req);
 453 }
 454
 455
 456 /****************************************************************************
 457  nttrans raw - only BLOBs used in this interface.
 458  at the moment we only handle a single primary request
 459 ****************************************************************************/
 460 struct cli_request *smb_raw_nttrans_send(struct cli_tree *tree,
 461                                          struct smb_nttrans *parms)
 462 {
 463         struct cli_request *req;
 464         char *outdata, *outparam;
 465         int i;
 466         int align = 0;
 467
 468         /* only align if there are parameters or data */
 469         if (parms->in.params.length || parms->in.data.length) {
 470                 align = 3;
 471         }
 472
 473         req = cli_request_setup(tree, SMBnttrans,
 474                                 19 + parms->in.setup_count,
 475                                 align +
 476                                 parms->in.params.length +
 477                                 parms->in.data.length);
 478         if (!req) {
 479                 return NULL;
 480         }
 481
 482         /* fill in SMB parameters */
 483         outparam = req->out.data + align;
 484         outdata = outparam + parms->in.params.length;
 485
 486         SCVAL(req->out.vwv,  0, parms->in.max_setup);
 487         SSVAL(req->out.vwv,  1, 0); /* reserved */
 488         SIVAL(req->out.vwv,  3, parms->in.params.length);
 489         SIVAL(req->out.vwv,  7, parms->in.data.length);
 490         SIVAL(req->out.vwv, 11, parms->in.max_param);
 491         SIVAL(req->out.vwv, 15, parms->in.max_data);
 492         SIVAL(req->out.vwv, 19, parms->in.params.length);
 493         SIVAL(req->out.vwv, 23, PTR_DIFF(outparam,req->out.hdr));
 494         SIVAL(req->out.vwv, 27, parms->in.data.length);
 495         SIVAL(req->out.vwv, 31, PTR_DIFF(outdata,req->out.hdr));
 496         SCVAL(req->out.vwv, 35, parms->in.setup_count);
 497         SSVAL(req->out.vwv, 36, parms->in.function);
 498         for (i=0;i<parms->in.setup_count;i++) {
 499                 SSVAL(req->out.vwv,VWV(19+i),parms->in.setup[i]);
 500         }
 501         if (parms->in.params.length) {
 502                 memcpy(outparam, parms->in.params.data, parms->in.params.length);
 503         }
 504         if (parms->in.data.length) {
 505                 memcpy(outparam, parms->in.data.data, parms->in.data.length);
 506         }
 507
 508         if (!cli_request_send(req)) {
 509                 cli_request_destroy(req);
 510                 return NULL;
 511         }
 512
 513         return req;
 514 }
 515
 516
 517 /****************************************************************************
 518   receive a SMB nttrans response allocating the necessary memory
 519   ****************************************************************************/
 520 NTSTATUS smb_raw_nttrans(struct cli_tree *tree,
 521                          TALLOC_CTX *mem_ctx,
 522                          struct smb_nttrans *parms)
 523 {
 524         struct cli_request *req;
 525
 526         req = smb_raw_nttrans_send(tree, parms);
 527         if (!req) {
 528                 return NT_STATUS_UNSUCCESSFUL;
 529         }
 530
 531         return smb_raw_nttrans_recv(req, mem_ctx, parms);
 532 }