source/smb_server/nttrans.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    NT transaction handling
   4    Copyright (C) Andrew Tridgell 2003
   5    Copyright (C) James J 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    This file handles the parsing of transact2 requests
  23 */
  24
  25 #include "includes.h"
  26 #include "smb_server/smb_server.h"
  27 #include "librpc/gen_ndr/ndr_security.h"
  28
  29
  30
  31 #define CHECK_MIN_BLOB_SIZE(blob, size) do { \
  32         if ((blob)->length < (size)) { \
  33                 return NT_STATUS_INFO_LENGTH_MISMATCH; \
  34         }} while (0)
  35
  36
  37 /* setup a nttrans reply, given the data and params sizes */
  38 static void nttrans_setup_reply(struct smbsrv_request *req,
  39                                struct smb_nttrans *trans,
  40                                uint16_t param_size, uint16_t data_size,
  41                                uint16_t setup_count)
  42 {
  43         trans->out.setup_count = setup_count;
  44         if (setup_count != 0) {
  45                 trans->out.setup = talloc_zero_array_p(req, uint16_t, setup_count);
  46         }
  47         trans->out.params = data_blob_talloc(req, NULL, param_size);
  48         trans->out.data = data_blob_talloc(req, NULL, data_size);
  49 }
  50
  51
  52 /*
  53    parse NTTRANS_CREATE request
  54  */
  55 static NTSTATUS nttrans_create(struct smbsrv_request *req,
  56                                struct smb_nttrans *trans)
  57 {
  58         union smb_open *io;
  59         uint16_t fname_len;
  60         uint32_t sd_length, ea_length;
  61         NTSTATUS status;
  62         uint8_t *params;
  63
  64         if (trans->in.params.length < 54) {
  65                 return NT_STATUS_INVALID_PARAMETER;
  66         }
  67
  68         /* parse the request */
  69         io = talloc_p(req, union smb_open);
  70         if (io == NULL) {
  71                 return NT_STATUS_NO_MEMORY;
  72         }
  73
  74         io->ntcreatex.level = RAW_OPEN_NTTRANS_CREATE;
  75
  76         params = trans->in.params.data;
  77
  78         io->ntcreatex.in.flags            = IVAL(params,  0);
  79         io->ntcreatex.in.root_fid         = IVAL(params,  4);
  80         io->ntcreatex.in.access_mask      = IVAL(params,  8);
  81         io->ntcreatex.in.alloc_size       = BVAL(params, 12);
  82         io->ntcreatex.in.file_attr        = IVAL(params, 20);
  83         io->ntcreatex.in.share_access     = IVAL(params, 24);
  84         io->ntcreatex.in.open_disposition = IVAL(params, 28);
  85         io->ntcreatex.in.create_options   = IVAL(params, 32);
  86         sd_length                         = IVAL(params, 36);
  87         ea_length                         = IVAL(params, 40);
  88         fname_len                         = IVAL(params, 44);
  89         io->ntcreatex.in.impersonation    = IVAL(params, 48);
  90         io->ntcreatex.in.security_flags   = CVAL(params, 52);
  91         io->ntcreatex.in.sec_desc         = NULL;
  92         io->ntcreatex.in.ea_list          = NULL;
  93
  94         req_pull_string(req, &io->ntcreatex.in.fname,
  95                         params + 54,
  96                         trans->in.params.length - 54,
  97                         STR_NO_RANGE_CHECK | STR_TERMINATE);
  98         if (!io->ntcreatex.in.fname) {
  99                 return NT_STATUS_INVALID_PARAMETER;
 100         }
 101
 102         if (sd_length > trans->in.data.length ||
 103             ea_length > trans->in.data.length ||
 104             (sd_length+ea_length) > trans->in.data.length) {
 105                 return NT_STATUS_INVALID_PARAMETER;
 106         }
 107
 108         /* this call has an optional security descriptor */
 109         if (sd_length != 0) {
 110                 DATA_BLOB blob;
 111                 blob.data = trans->in.data.data;
 112                 blob.length = sd_length;
 113                 io->ntcreatex.in.sec_desc = talloc_p(io, struct security_descriptor);
 114                 if (io->ntcreatex.in.sec_desc == NULL) {
 115                         return NT_STATUS_NO_MEMORY;
 116                 }
 117                 status = ndr_pull_struct_blob(&blob, io,
 118                                               io->ntcreatex.in.sec_desc,
 119                                               (ndr_pull_flags_fn_t)ndr_pull_security_descriptor);
 120                 if (!NT_STATUS_IS_OK(status)) {
 121                         return status;
 122                 }
 123         }
 124
 125         /* and an optional ea_list */
 126         if (ea_length > 4) {
 127                 DATA_BLOB blob;
 128                 blob.data = trans->in.data.data + sd_length;
 129                 blob.length = ea_length;
 130                 io->ntcreatex.in.ea_list = talloc_p(io, struct smb_ea_list);
 131                 if (io->ntcreatex.in.ea_list == NULL) {
 132                         return NT_STATUS_NO_MEMORY;
 133                 }
 134
 135                 status = ea_pull_list_chained(&blob, io,
 136                                               &io->ntcreatex.in.ea_list->num_eas,
 137                                               &io->ntcreatex.in.ea_list->eas);
 138                 if (!NT_STATUS_IS_OK(status)) {
 139                         return status;
 140                 }
 141         }
 142
 143         /* call the backend - notice that we do it sync for now, until we support
 144            async nttrans requests */
 145         status = ntvfs_openfile(req, io);
 146         if (!NT_STATUS_IS_OK(status)) {
 147                 return status;
 148         }
 149
 150         trans->out.setup_count = 0;
 151         trans->out.setup       = NULL;
 152         trans->out.params      = data_blob_talloc(req, NULL, 69);
 153         trans->out.data        = data_blob(NULL, 0);
 154
 155         params = trans->out.params.data;
 156         if (params == NULL) {
 157                 return NT_STATUS_NO_MEMORY;
 158         }
 159
 160         SSVAL(params,        0, io->ntcreatex.out.oplock_level);
 161         SSVAL(params,        2, io->ntcreatex.out.fnum);
 162         SIVAL(params,        4, io->ntcreatex.out.create_action);
 163         SIVAL(params,        8, 0); /* ea error offset */
 164         push_nttime(params, 12, io->ntcreatex.out.create_time);
 165         push_nttime(params, 20, io->ntcreatex.out.access_time);
 166         push_nttime(params, 28, io->ntcreatex.out.write_time);
 167         push_nttime(params, 36, io->ntcreatex.out.change_time);
 168         SIVAL(params,       44, io->ntcreatex.out.attrib);
 169         SBVAL(params,       48, io->ntcreatex.out.alloc_size);
 170         SBVAL(params,       56, io->ntcreatex.out.size);
 171         SSVAL(params,       64, io->ntcreatex.out.file_type);
 172         SSVAL(params,       66, io->ntcreatex.out.ipc_state);
 173         SCVAL(params,       68, io->ntcreatex.out.is_directory);
 174
 175         return NT_STATUS_OK;
 176 }
 177
 178
 179 /*
 180    parse NTTRANS_QUERY_SEC_DESC request
 181  */
 182 static NTSTATUS nttrans_query_sec_desc(struct smbsrv_request *req,
 183                                        struct smb_nttrans *trans)
 184 {
 185         union smb_fileinfo *io;
 186         NTSTATUS status;
 187
 188         if (trans->in.params.length < 8) {
 189                 return NT_STATUS_INVALID_PARAMETER;
 190         }
 191
 192         /* parse the request */
 193         io = talloc_p(req, union smb_fileinfo);
 194         if (io == NULL) {
 195                 return NT_STATUS_NO_MEMORY;
 196         }
 197
 198         io->query_secdesc.level            = RAW_FILEINFO_SEC_DESC;
 199         io->query_secdesc.in.fnum          = SVAL(trans->in.params.data, 0);
 200         io->query_secdesc.in.secinfo_flags = IVAL(trans->in.params.data, 4);
 201
 202         /* call the backend - notice that we do it sync for now, until we support
 203            async nttrans requests */
 204         status = ntvfs_qfileinfo(req, io);
 205         if (!NT_STATUS_IS_OK(status)) {
 206                 return status;
 207         }
 208
 209         trans->out.setup_count = 0;
 210         trans->out.setup       = NULL;
 211         trans->out.params      = data_blob_talloc(req, NULL, 4);
 212         trans->out.data        = data_blob(NULL, 0);
 213
 214         status = ndr_push_struct_blob(&trans->out.data, req,
 215                                       io->query_secdesc.out.sd,
 216                                       (ndr_push_flags_fn_t)ndr_push_security_descriptor);
 217         if (!NT_STATUS_IS_OK(status)) {
 218                 return status;
 219         }
 220
 221         SIVAL(trans->out.params.data, 0, trans->out.data.length);
 222
 223         return NT_STATUS_OK;
 224 }
 225
 226
 227 /*
 228    parse NTTRANS_SET_SEC_DESC request
 229  */
 230 static NTSTATUS nttrans_set_sec_desc(struct smbsrv_request *req,
 231                                        struct smb_nttrans *trans)
 232 {
 233         union smb_setfileinfo *io;
 234         NTSTATUS status;
 235
 236         if (trans->in.params.length < 8) {
 237                 return NT_STATUS_INVALID_PARAMETER;
 238         }
 239
 240         /* parse the request */
 241         io = talloc_p(req, union smb_setfileinfo);
 242         if (io == NULL) {
 243                 return NT_STATUS_NO_MEMORY;
 244         }
 245
 246         io->set_secdesc.level            = RAW_SFILEINFO_SEC_DESC;
 247         io->set_secdesc.file.fnum        = SVAL(trans->in.params.data, 0);
 248         io->set_secdesc.in.secinfo_flags = IVAL(trans->in.params.data, 4);
 249
 250         io->set_secdesc.in.sd = talloc_p(io, struct security_descriptor);
 251         if (io->set_secdesc.in.sd == NULL) {
 252                 return NT_STATUS_NO_MEMORY;
 253         }
 254
 255         status = ndr_pull_struct_blob(&trans->in.data, req,
 256                                       io->set_secdesc.in.sd,
 257                                       (ndr_pull_flags_fn_t)ndr_pull_security_descriptor);
 258         if (!NT_STATUS_IS_OK(status)) {
 259                 return status;
 260         }
 261
 262         /* call the backend - notice that we do it sync for now, until we support
 263            async nttrans requests */
 264         status = ntvfs_setfileinfo(req, io);
 265         if (!NT_STATUS_IS_OK(status)) {
 266                 return status;
 267         }
 268
 269         trans->out.setup_count = 0;
 270         trans->out.setup       = NULL;
 271         trans->out.params      = data_blob(NULL, 0);
 272         trans->out.data        = data_blob(NULL, 0);
 273
 274         return NT_STATUS_OK;
 275 }
 276
 277
 278 /* parse NTTRANS_RENAME request
 279  */
 280 static NTSTATUS nttrans_rename(struct smbsrv_request *req,
 281                                struct smb_nttrans *trans)
 282 {
 283         return NT_STATUS_FOOBAR;
 284 }
 285
 286 /*
 287    parse NTTRANS_IOCTL request
 288  */
 289 static NTSTATUS nttrans_ioctl(struct smbsrv_request *req,
 290                 struct smb_nttrans *trans)
 291 {
 292         union smb_ioctl nt;
 293         uint32_t function;
 294         uint16_t fnum;
 295         uint8_t filter;
 296         BOOL fsctl;
 297         DATA_BLOB *blob;
 298
 299         /* should have at least 4 setup words */
 300         if (trans->in.setup_count != 4) {
 301                 return NT_STATUS_INVALID_PARAMETER;
 302         }
 303
 304         function  = IVAL(trans->in.setup, 0);
 305         fnum  = SVAL(trans->in.setup, 4);
 306         fsctl = CVAL(trans->in.setup, 6);
 307         filter = CVAL(trans->in.setup, 7);
 308
 309         blob = &trans->in.data;
 310
 311         nt.ntioctl.level = RAW_IOCTL_NTIOCTL;
 312         nt.ntioctl.in.fnum = fnum;
 313         nt.ntioctl.in.function = function;
 314         nt.ntioctl.in.fsctl = fsctl;
 315         nt.ntioctl.in.filter = filter;
 316
 317         nttrans_setup_reply(req, trans, 0, 0, 1);
 318         trans->out.setup[0] = 0;
 319
 320         return ntvfs_ioctl(req, &nt);
 321 }
 322
 323 /*
 324   backend for nttrans requests
 325 */
 326 static NTSTATUS nttrans_backend(struct smbsrv_request *req,
 327                 struct smb_nttrans *trans)
 328 {
 329         /* the nttrans command is in function */
 330         switch (trans->in.function) {
 331         case NT_TRANSACT_CREATE:
 332                 return nttrans_create(req, trans);
 333         case NT_TRANSACT_IOCTL:
 334                 return nttrans_ioctl(req, trans);
 335         case NT_TRANSACT_RENAME:
 336                 return nttrans_rename(req, trans);
 337         case NT_TRANSACT_QUERY_SECURITY_DESC:
 338                 return nttrans_query_sec_desc(req, trans);
 339         case NT_TRANSACT_SET_SECURITY_DESC:
 340                 return nttrans_set_sec_desc(req, trans);
 341         }
 342
 343         /* an unknown nttrans command */
 344         return NT_STATUS_FOOBAR;
 345 }
 346
 347
 348 /****************************************************************************
 349  Reply to an SMBnttrans request
 350 ****************************************************************************/
 351 void reply_nttrans(struct smbsrv_request *req)
 352 {
 353         struct smb_nttrans trans;
 354         int i;
 355         uint16_t param_ofs, data_ofs;
 356         uint16_t param_count, data_count;
 357         uint16_t params_left, data_left;
 358         uint16_t param_total, data_total;
 359         uint8_t *params, *data;
 360         NTSTATUS status;
 361
 362         /* parse request */
 363         if (req->in.wct < 19) {
 364                 req_reply_error(req, NT_STATUS_FOOBAR);
 365                 return;
 366         }
 367
 368         trans.in.max_setup   = CVAL(req->in.vwv, 0);
 369         param_total          = IVAL(req->in.vwv, 3);
 370         data_total           = IVAL(req->in.vwv, 7);
 371         trans.in.max_param   = IVAL(req->in.vwv, 11);
 372         trans.in.max_data    = IVAL(req->in.vwv, 15);
 373         param_count          = IVAL(req->in.vwv, 19);
 374         param_ofs            = IVAL(req->in.vwv, 23);
 375         data_count           = IVAL(req->in.vwv, 27);
 376         data_ofs             = IVAL(req->in.vwv, 31);
 377         trans.in.setup_count = CVAL(req->in.vwv, 35);
 378         trans.in.function        = SVAL(req->in.vwv, 36);
 379
 380         if (req->in.wct != 19 + trans.in.setup_count) {
 381                 req_reply_dos_error(req, ERRSRV, ERRerror);
 382                 return;
 383         }
 384
 385         /* parse out the setup words */
 386         trans.in.setup = talloc_array_p(req, uint16_t, trans.in.setup_count);
 387         if (!trans.in.setup) {
 388                 req_reply_error(req, NT_STATUS_NO_MEMORY);
 389                 return;
 390         }
 391         for (i=0;i<trans.in.setup_count;i++) {
 392                 trans.in.setup[i] = SVAL(req->in.vwv, VWV(19+i));
 393         }
 394
 395         if (!req_pull_blob(req, req->in.hdr + param_ofs, param_count, &trans.in.params) ||
 396             !req_pull_blob(req, req->in.hdr + data_ofs, data_count, &trans.in.data)) {
 397                 req_reply_error(req, NT_STATUS_FOOBAR);
 398                 return;
 399         }
 400
 401         /* is it a partial request? if so, then send a 'send more' message */
 402         if (param_total > param_count ||
 403             data_total > data_count) {
 404                 DEBUG(0,("REWRITE: not handling partial nttrans requests!\n"));
 405                 return;
 406         }
 407
 408         /* its a full request, give it to the backend */
 409         status = nttrans_backend(req, &trans);
 410
 411         if (NT_STATUS_IS_ERR(status)) {
 412                 req_reply_error(req, status);
 413                 return;
 414         }
 415
 416 #if 0
 417         /* w2k3 does not check the max_setup count */
 418         if (trans.out.setup_count > trans.in.max_setup) {
 419                 req_reply_error(req, NT_STATUS_BUFFER_TOO_SMALL);
 420                 return;
 421         }
 422 #endif
 423         if (trans.out.params.length > trans.in.max_param) {
 424                 status = NT_STATUS_BUFFER_TOO_SMALL;
 425                 trans.out.params.length = trans.in.max_param;
 426         }
 427         if (trans.out.data.length > trans.in.max_data) {
 428                 status = NT_STATUS_BUFFER_TOO_SMALL;
 429                 trans.out.data.length = trans.in.max_data;
 430         }
 431
 432         params_left = trans.out.params.length;
 433         data_left   = trans.out.data.length;
 434         params      = trans.out.params.data;
 435         data        = trans.out.data.data;
 436
 437         req_setup_reply(req, 18 + trans.out.setup_count, 0);
 438
 439         if (!NT_STATUS_IS_OK(status)) {
 440                 req_setup_error(req, status);
 441         }
 442
 443         /* we need to divide up the reply into chunks that fit into
 444            the negotiated buffer size */
 445         do {
 446                 uint16_t this_data, this_param, max_bytes;
 447                 uint_t align1 = 1, align2 = (params_left ? 2 : 0);
 448                 struct smbsrv_request *this_req;
 449
 450                 max_bytes = req_max_data(req) - (align1 + align2);
 451
 452                 this_param = params_left;
 453                 if (this_param > max_bytes) {
 454                         this_param = max_bytes;
 455                 }
 456                 max_bytes -= this_param;
 457
 458                 this_data = data_left;
 459                 if (this_data > max_bytes) {
 460                         this_data = max_bytes;
 461                 }
 462
 463                 /* don't destroy unless this is the last chunk */
 464                 if (params_left - this_param != 0 ||
 465                     data_left - this_data != 0) {
 466                         this_req = req_setup_secondary(req);
 467                 } else {
 468                         this_req = req;
 469                 }
 470
 471                 req_grow_data(req, this_param + this_data + (align1 + align2));
 472
 473                 SSVAL(this_req->out.vwv, 0, 0); /* reserved */
 474                 SCVAL(this_req->out.vwv, 2, 0); /* reserved */
 475                 SIVAL(this_req->out.vwv, 3, trans.out.params.length);
 476                 SIVAL(this_req->out.vwv, 7, trans.out.data.length);
 477
 478                 SIVAL(this_req->out.vwv, 11, this_param);
 479                 SIVAL(this_req->out.vwv, 15, align1 + PTR_DIFF(this_req->out.data, this_req->out.hdr));
 480                 SIVAL(this_req->out.vwv, 19, PTR_DIFF(params, trans.out.params.data));
 481
 482                 SIVAL(this_req->out.vwv, 23, this_data);
 483                 SIVAL(this_req->out.vwv, 27, align1 + align2 +
 484                       PTR_DIFF(this_req->out.data + this_param, this_req->out.hdr));
 485                 SIVAL(this_req->out.vwv, 31, PTR_DIFF(data, trans.out.data.data));
 486
 487                 SCVAL(this_req->out.vwv, 35, trans.out.setup_count);
 488                 for (i=0;i<trans.out.setup_count;i++) {
 489                         SSVAL(this_req->out.vwv, VWV(18+i), trans.out.setup[i]);
 490                 }
 491
 492                 memset(this_req->out.data, 0, align1);
 493                 if (this_param != 0) {
 494                         memcpy(this_req->out.data + align1, params, this_param);
 495                 }
 496                 memset(this_req->out.data+this_param+align1, 0, align2);
 497                 if (this_data != 0) {
 498                         memcpy(this_req->out.data+this_param+align1+align2,
 499                                data, this_data);
 500                 }
 501
 502                 params_left -= this_param;
 503                 data_left -= this_data;
 504                 params += this_param;
 505                 data += this_data;
 506
 507                 req_send_reply(this_req);
 508         } while (params_left != 0 || data_left != 0);
 509 }
 510
 511
 512 /****************************************************************************
 513  Reply to an SMBnttranss request
 514 ****************************************************************************/
 515 void reply_nttranss(struct smbsrv_request *req)
 516 {
 517         req_reply_error(req, NT_STATUS_FOOBAR);
 518 }