source4/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                 req->status = NT_STATUS_UNSUCCESSFUL;
  68                 return cli_request_destroy(req);
  69         }
  70
  71         /*
  72          * An NT RPC pipe call can return ERRDOS, ERRmoredata
  73          * to a trans call. This is not an error and should not
  74          * be treated as such.
  75          */
  76         if (NT_STATUS_IS_ERR(req->status)) {
  77                 return cli_request_destroy(req);
  78         }
  79
  80         CLI_CHECK_MIN_WCT(req, 10);
  81
  82         /* parse out the lengths */
  83         total_data = SVAL(req->in.vwv, VWV(1));
  84         total_param = SVAL(req->in.vwv, VWV(0));
  85
  86         /* allocate it */
  87         if (total_data != 0) {
  88                 tdata = talloc_realloc(mem_ctx, parms->out.data.data,total_data);
  89                 if (!tdata) {
  90                         DEBUG(0,("smb_raw_receive_trans: failed to enlarge data buffer to %d bytes\n", total_data));
  91                         req->status = NT_STATUS_NO_MEMORY;
  92                         return cli_request_destroy(req);
  93                 }
  94                 parms->out.data.data = tdata;
  95         }
  96
  97         if (total_param != 0) {
  98                 tparam = talloc_realloc(mem_ctx, parms->out.params.data,total_param);
  99                 if (!tparam) {
 100                         DEBUG(0,("smb_raw_receive_trans: failed to enlarge param buffer to %d bytes\n", total_param));
 101                         req->status = NT_STATUS_NO_MEMORY;
 102                         return cli_request_destroy(req);
 103                 }
 104                 parms->out.params.data = tparam;
 105         }
 106
 107         parms->out.setup_count = SVAL(req->in.vwv, VWV(9));
 108         CLI_CHECK_WCT(req, 10 + parms->out.setup_count);
 109
 110         if (parms->out.setup_count > 0) {
 111                 int i;
 112                 parms->out.setup = talloc(mem_ctx, 2 * parms->out.setup_count);
 113                 if (!parms->out.setup) {
 114                         req->status = NT_STATUS_NO_MEMORY;
 115                         return cli_request_destroy(req);
 116                 }
 117                 for (i=0;i<parms->out.setup_count;i++) {
 118                         parms->out.setup[i] = SVAL(req->in.vwv, VWV(10+i));
 119                 }
 120         }
 121
 122         while (1)  {
 123                 uint16 param_count, param_ofs, param_disp;
 124                 uint16 data_count, data_ofs, data_disp;
 125                 uint16 total_data2, total_param2;
 126
 127                 /* parse out the total lengths again - they can shrink! */
 128                 total_data2 = SVAL(req->in.vwv, VWV(1));
 129                 total_param2 = SVAL(req->in.vwv, VWV(0));
 130
 131                 if (total_data2 > total_data ||
 132                     total_param2 > total_param) {
 133                         /* they must *only* shrink */
 134                         DEBUG(1,("smb_raw_receive_trans: data/params expanded!\n"));
 135                         req->status = NT_STATUS_BUFFER_TOO_SMALL;
 136                         return cli_request_destroy(req);
 137                 }
 138
 139                 total_data = total_data2;
 140                 total_param = total_param2;
 141
 142                 /* parse params for this lump */
 143                 param_count = SVAL(req->in.vwv, VWV(3));
 144                 param_ofs   = SVAL(req->in.vwv, VWV(4));
 145                 param_disp  = SVAL(req->in.vwv, VWV(5));
 146
 147                 data_count = SVAL(req->in.vwv, VWV(6));
 148                 data_ofs   = SVAL(req->in.vwv, VWV(7));
 149                 data_disp  = SVAL(req->in.vwv, VWV(8));
 150
 151                 if (data_count + data_disp > total_data ||
 152                     param_count + param_disp > total_param) {
 153                         DEBUG(1,("smb_raw_receive_trans: Buffer overflow\n"));
 154                         req->status = NT_STATUS_BUFFER_TOO_SMALL;
 155                         return cli_request_destroy(req);
 156                 }
 157
 158                 /* check the server isn't being nasty */
 159                 if (raw_trans_oob(req, param_ofs, param_count) ||
 160                     raw_trans_oob(req, data_ofs, data_count)) {
 161                         DEBUG(1,("smb_raw_receive_trans: out of bounds parameters!\n"));
 162                         req->status = NT_STATUS_BUFFER_TOO_SMALL;
 163                         return cli_request_destroy(req);
 164                 }
 165
 166                 if (data_count) {
 167                         memcpy(parms->out.data.data + data_disp,
 168                                req->in.hdr + data_ofs,
 169                                data_count);
 170                 }
 171
 172                 if (param_count) {
 173                         memcpy(parms->out.params.data + param_disp,
 174                                req->in.hdr + param_ofs,
 175                                param_count);
 176                 }
 177
 178                 parms->out.data.length += data_count;
 179                 parms->out.params.length += param_count;
 180
 181                 if (total_data <= parms->out.data.length && total_param <= parms->out.params.length)
 182                         break;
 183
 184                 /* to receive more requests we need to mark this request as not received */
 185                 req->in.buffer = NULL;
 186
 187                 if (!cli_request_receive(req)) {
 188                         req->status = NT_STATUS_UNSUCCESSFUL;
 189                         return cli_request_destroy(req);
 190                 }
 191         }
 192
 193 failed:
 194         return cli_request_destroy(req);
 195 }
 196
 197 NTSTATUS smb_raw_trans_recv(struct cli_request *req,
 198                              TALLOC_CTX *mem_ctx,
 199                              struct smb_trans2 *parms)
 200 {
 201         return smb_raw_trans2_recv(req, mem_ctx, parms);
 202 }
 203
 204 /****************************************************************************
 205  trans/trans2 raw async interface - only BLOBs used in this interface.
 206  note that this doesn't yet support multi-part requests
 207 ****************************************************************************/
 208 struct cli_request *smb_raw_trans_send_backend(struct cli_tree *tree,
 209                                                struct smb_trans2 *parms,
 210                                                uint8 command)
 211 {
 212         int wct = 14 + parms->in.setup_count;
 213         struct cli_request *req;
 214         char *outdata,*outparam;
 215         int i;
 216         int padding;
 217         size_t namelen = 0;
 218
 219         if (command == SMBtrans)
 220                 padding = 1;
 221         else
 222                 padding = 3;
 223
 224         req = cli_request_setup(tree, command, wct, padding);
 225         if (!req) {
 226                 return NULL;
 227         }
 228
 229         /* fill in SMB parameters */
 230         outparam = req->out.data + padding;
 231         outdata = outparam + parms->in.params.length;
 232
 233         /* make sure we don't leak data via the padding */
 234         memset(req->out.data, 0, padding);
 235
 236         if (command == SMBtrans && parms->in.trans_name) {
 237                 namelen = cli_req_append_string(req, parms->in.trans_name,
 238                                                 STR_TERMINATE);
 239         }
 240
 241         /* primary request */
 242         SSVAL(req->out.vwv,VWV(0),parms->in.params.length);
 243         SSVAL(req->out.vwv,VWV(1),parms->in.data.length);
 244         SSVAL(req->out.vwv,VWV(2),parms->in.max_param);
 245         SSVAL(req->out.vwv,VWV(3),parms->in.max_data);
 246         SSVAL(req->out.vwv,VWV(4),parms->in.max_setup);
 247         SSVAL(req->out.vwv,VWV(5),parms->in.flags);
 248         SIVAL(req->out.vwv,VWV(6),parms->in.timeout);
 249         SSVAL(req->out.vwv,VWV(8),0); /* reserved */
 250         SSVAL(req->out.vwv,VWV(9),parms->in.params.length);
 251         SSVAL(req->out.vwv,VWV(10),PTR_DIFF(outparam,req->out.hdr)+namelen);
 252         SSVAL(req->out.vwv,VWV(11),parms->in.data.length);
 253         SSVAL(req->out.vwv,VWV(12),PTR_DIFF(outdata,req->out.hdr)+namelen);
 254         SSVAL(req->out.vwv,VWV(13),parms->in.setup_count);
 255         for (i=0;i<parms->in.setup_count;i++)   {
 256                 SSVAL(req->out.vwv,VWV(14)+i*2,parms->in.setup[i]);
 257         }
 258         if (parms->in.params.data)      {
 259                 cli_req_append_blob(req, &parms->in.params);
 260         }
 261         if (parms->in.data.data) {
 262                 cli_req_append_blob(req, &parms->in.data);
 263         }
 264
 265         if (!cli_request_send(req)) {
 266                 cli_request_destroy(req);
 267                 return NULL;
 268         }
 269
 270         return req;
 271 }
 272
 273 /****************************************************************************
 274  trans/trans2 raw async interface - only BLOBs used in this interface.
 275 note that this doesn't yet support multi-part requests
 276 ****************************************************************************/
 277
 278 struct cli_request *smb_raw_trans_send(struct cli_tree *tree,
 279                                        struct smb_trans2 *parms)
 280 {
 281         return smb_raw_trans_send_backend(tree, parms, SMBtrans);
 282 }
 283
 284 struct cli_request *smb_raw_trans2_send(struct cli_tree *tree,
 285                                        struct smb_trans2 *parms)
 286 {
 287         return smb_raw_trans_send_backend(tree, parms, SMBtrans2);
 288 }
 289
 290 /*
 291   trans2 synchronous blob interface
 292 */
 293 NTSTATUS smb_raw_trans2(struct cli_tree *tree,
 294                         TALLOC_CTX *mem_ctx,
 295                         struct smb_trans2 *parms)
 296 {
 297         struct cli_request *req;
 298         req = smb_raw_trans2_send(tree, parms);
 299         if (!req) return NT_STATUS_UNSUCCESSFUL;
 300         return smb_raw_trans2_recv(req, mem_ctx, parms);
 301 }
 302
 303
 304 /*
 305   trans synchronous blob interface
 306 */
 307 NTSTATUS smb_raw_trans(struct cli_tree *tree,
 308                        TALLOC_CTX *mem_ctx,
 309                        struct smb_trans2 *parms)
 310 {
 311         struct cli_request *req;
 312         req = smb_raw_trans_send(tree, parms);
 313         if (!req) return NT_STATUS_UNSUCCESSFUL;
 314         return smb_raw_trans_recv(req, mem_ctx, parms);
 315 }
 316
 317 /****************************************************************************
 318   receive a SMB nttrans response allocating the necessary memory
 319   ****************************************************************************/
 320 NTSTATUS smb_raw_nttrans_recv(struct cli_request *req,
 321                               TALLOC_CTX *mem_ctx,
 322                               struct smb_nttrans *parms)
 323 {
 324         uint32 total_data, recvd_data=0;
 325         uint32 total_param, recvd_param=0;
 326
 327         if (!cli_request_receive(req) ||
 328             cli_request_is_error(req)) {
 329                 return cli_request_destroy(req);
 330         }
 331
 332         /* sanity check */
 333         if (CVAL(req->in.hdr, HDR_COM) != SMBnttrans) {
 334                 DEBUG(0,("smb_raw_receive_nttrans: Expected %s response, got command 0x%02x\n",
 335                          "SMBnttrans",
 336                          CVAL(req->in.hdr,HDR_COM)));
 337                 req->status = NT_STATUS_UNSUCCESSFUL;
 338                 return cli_request_destroy(req);
 339         }
 340
 341         CLI_CHECK_MIN_WCT(req, 18);
 342
 343         /* parse out the lengths */
 344         total_param = IVAL(req->in.vwv, 3);
 345         total_data  = IVAL(req->in.vwv, 7);
 346
 347         parms->out.data = data_blob_talloc(mem_ctx, NULL, total_data);
 348         parms->out.params = data_blob_talloc(mem_ctx, NULL, total_param);
 349
 350         if (parms->out.data.length != total_data ||
 351             parms->out.params.length != total_param) {
 352                 req->status = NT_STATUS_NO_MEMORY;
 353                 return cli_request_destroy(req);
 354         }
 355
 356         parms->out.setup_count = CVAL(req->in.vwv, 35);
 357         CLI_CHECK_WCT(req, 18 + parms->out.setup_count);
 358
 359         if (parms->out.setup_count > 0) {
 360                 int i;
 361                 parms->out.setup = talloc(mem_ctx, 2 * parms->out.setup_count);
 362                 if (!parms->out.setup) {
 363                         req->status = NT_STATUS_NO_MEMORY;
 364                         return cli_request_destroy(req);
 365                 }
 366                 for (i=0;i<parms->out.setup_count;i++) {
 367                         parms->out.setup[i] = SVAL(req->in.vwv, VWV(18+i));
 368                 }
 369         }
 370
 371         while (recvd_data < total_data ||
 372                recvd_param < total_param)  {
 373                 uint32 param_count, param_ofs, param_disp;
 374                 uint32 data_count, data_ofs, data_disp;
 375                 uint32 total_data2, total_param2;
 376
 377                 /* parse out the total lengths again - they can shrink! */
 378                 total_param2 = IVAL(req->in.vwv, 3);
 379                 total_data2  = IVAL(req->in.vwv, 7);
 380
 381                 if (total_data2 > total_data ||
 382                     total_param2 > total_param) {
 383                         /* they must *only* shrink */
 384                         DEBUG(1,("smb_raw_receive_nttrans: data/params expanded!\n"));
 385                         req->status = NT_STATUS_BUFFER_TOO_SMALL;
 386                         return cli_request_destroy(req);
 387                 }
 388
 389                 total_data = total_data2;
 390                 total_param = total_param2;
 391                 parms->out.data.length = total_data;
 392                 parms->out.params.length = total_param;
 393
 394                 /* parse params for this lump */
 395                 param_count = IVAL(req->in.vwv, 11);
 396                 param_ofs   = IVAL(req->in.vwv, 15);
 397                 param_disp  = IVAL(req->in.vwv, 19);
 398
 399                 data_count = IVAL(req->in.vwv, 23);
 400                 data_ofs   = IVAL(req->in.vwv, 27);
 401                 data_disp  = IVAL(req->in.vwv, 31);
 402
 403                 if (data_count + data_disp > total_data ||
 404                     param_count + param_disp > total_param) {
 405                         DEBUG(1,("smb_raw_receive_nttrans: Buffer overflow\n"));
 406                         req->status = NT_STATUS_BUFFER_TOO_SMALL;
 407                         return cli_request_destroy(req);
 408                 }
 409
 410                 /* check the server isn't being nasty */
 411                 if (raw_trans_oob(req, param_ofs, param_count) ||
 412                     raw_trans_oob(req, data_ofs, data_count)) {
 413                         DEBUG(1,("smb_raw_receive_nttrans: out of bounds parameters!\n"));
 414                         req->status = NT_STATUS_BUFFER_TOO_SMALL;
 415                         return cli_request_destroy(req);
 416                 }
 417
 418                 if (data_count) {
 419                         memcpy(parms->out.data.data + data_disp,
 420                                req->in.hdr + data_ofs,
 421                                data_count);
 422                 }
 423
 424                 if (param_count) {
 425                         memcpy(parms->out.params.data + param_disp,
 426                                req->in.hdr + param_ofs,
 427                                param_count);
 428                 }
 429
 430                 recvd_param += param_count;
 431                 recvd_data += data_count;
 432
 433                 if (recvd_data >= total_data &&
 434                     recvd_param >= total_param) {
 435                         break;
 436                 }
 437
 438                 if (!cli_request_receive(req) ||
 439                     cli_request_is_error(req)) {
 440                         return cli_request_destroy(req);
 441                 }
 442
 443                 /* sanity check */
 444                 if (CVAL(req->in.hdr, HDR_COM) != SMBnttrans) {
 445                         DEBUG(0,("smb_raw_receive_nttrans: Expected nttranss, got command 0x%02x\n",
 446                                  CVAL(req->in.hdr, HDR_COM)));
 447                         req->status = NT_STATUS_UNSUCCESSFUL;
 448                         return cli_request_destroy(req);
 449                 }
 450         }
 451
 452 failed:
 453         return cli_request_destroy(req);
 454 }
 455
 456
 457 /****************************************************************************
 458  nttrans raw - only BLOBs used in this interface.
 459  at the moment we only handle a single primary request
 460 ****************************************************************************/
 461 struct cli_request *smb_raw_nttrans_send(struct cli_tree *tree,
 462                                          struct smb_nttrans *parms)
 463 {
 464         struct cli_request *req;
 465         char *outdata, *outparam;
 466         int i;
 467         int align = 0;
 468
 469         /* only align if there are parameters or data */
 470         if (parms->in.params.length || parms->in.data.length) {
 471                 align = 3;
 472         }
 473
 474         req = cli_request_setup(tree, SMBnttrans,
 475                                 19 + parms->in.setup_count,
 476                                 align +
 477                                 parms->in.params.length +
 478                                 parms->in.data.length);
 479         if (!req) {
 480                 return NULL;
 481         }
 482
 483         /* fill in SMB parameters */
 484         outparam = req->out.data + align;
 485         outdata = outparam + parms->in.params.length;
 486
 487         SCVAL(req->out.vwv,  0, parms->in.max_setup);
 488         SSVAL(req->out.vwv,  1, 0); /* reserved */
 489         SIVAL(req->out.vwv,  3, parms->in.params.length);
 490         SIVAL(req->out.vwv,  7, parms->in.data.length);
 491         SIVAL(req->out.vwv, 11, parms->in.max_param);
 492         SIVAL(req->out.vwv, 15, parms->in.max_data);
 493         SIVAL(req->out.vwv, 19, parms->in.params.length);
 494         SIVAL(req->out.vwv, 23, PTR_DIFF(outparam,req->out.hdr));
 495         SIVAL(req->out.vwv, 27, parms->in.data.length);
 496         SIVAL(req->out.vwv, 31, PTR_DIFF(outdata,req->out.hdr));
 497         SCVAL(req->out.vwv, 35, parms->in.setup_count);
 498         SSVAL(req->out.vwv, 36, parms->in.function);
 499         for (i=0;i<parms->in.setup_count;i++) {
 500                 SSVAL(req->out.vwv,VWV(19+i),parms->in.setup[i]);
 501         }
 502         if (parms->in.params.length) {
 503                 memcpy(outparam, parms->in.params.data, parms->in.params.length);
 504         }
 505         if (parms->in.data.length) {
 506                 memcpy(outparam, parms->in.data.data, parms->in.data.length);
 507         }
 508
 509         if (!cli_request_send(req)) {
 510                 cli_request_destroy(req);
 511                 return NULL;
 512         }
 513
 514         return req;
 515 }
 516
 517
 518 /****************************************************************************
 519   receive a SMB nttrans response allocating the necessary memory
 520   ****************************************************************************/
 521 NTSTATUS smb_raw_nttrans(struct cli_tree *tree,
 522                          TALLOC_CTX *mem_ctx,
 523                          struct smb_nttrans *parms)
 524 {
 525         struct cli_request *req;
 526
 527         req = smb_raw_nttrans_send(tree, parms);
 528         if (!req) {
 529                 return NT_STATUS_UNSUCCESSFUL;
 530         }
 531
 532         return smb_raw_nttrans_recv(req, mem_ctx, parms);
 533 }