source4/smb_server/smb/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 #include "ntvfs/ntvfs.h"
  29 #include "libcli/raw/libcliraw.h"
  30
  31
  32
  33 #define CHECK_MIN_BLOB_SIZE(blob, size) do { \
  34         if ((blob)->length < (size)) { \
  35                 return NT_STATUS_INFO_LENGTH_MISMATCH; \
  36         }} while (0)
  37
  38
  39 /* setup a nttrans reply, given the data and params sizes */
  40 static void nttrans_setup_reply(struct smbsrv_request *req,
  41                                struct smb_nttrans *trans,
  42                                uint16_t param_size, uint16_t data_size,
  43                                uint16_t setup_count)
  44 {
  45         trans->out.setup_count = setup_count;
  46         if (setup_count != 0) {
  47                 trans->out.setup = talloc_zero_array(req, uint16_t, setup_count);
  48         }
  49         trans->out.params = data_blob_talloc(req, NULL, param_size);
  50         trans->out.data = data_blob_talloc(req, NULL, data_size);
  51 }
  52
  53
  54 /*
  55    parse NTTRANS_CREATE request
  56  */
  57 static NTSTATUS nttrans_create(struct smbsrv_request *req,
  58                                struct smb_nttrans *trans)
  59 {
  60         union smb_open *io;
  61         uint16_t fname_len;
  62         uint32_t sd_length, ea_length;
  63         NTSTATUS status;
  64         uint8_t *params;
  65
  66         if (trans->in.params.length < 54) {
  67                 return NT_STATUS_INVALID_PARAMETER;
  68         }
  69
  70         /* parse the request */
  71         io = talloc(req, union smb_open);
  72         if (io == NULL) {
  73                 return NT_STATUS_NO_MEMORY;
  74         }
  75
  76         io->ntcreatex.level = RAW_OPEN_NTTRANS_CREATE;
  77
  78         params = trans->in.params.data;
  79
  80         io->ntcreatex.in.flags            = IVAL(params,  0);
  81         io->ntcreatex.in.root_fid         = IVAL(params,  4);
  82         io->ntcreatex.in.access_mask      = IVAL(params,  8);
  83         io->ntcreatex.in.alloc_size       = BVAL(params, 12);
  84         io->ntcreatex.in.file_attr        = IVAL(params, 20);
  85         io->ntcreatex.in.share_access     = IVAL(params, 24);
  86         io->ntcreatex.in.open_disposition = IVAL(params, 28);
  87         io->ntcreatex.in.create_options   = IVAL(params, 32);
  88         sd_length                         = IVAL(params, 36);
  89         ea_length                         = IVAL(params, 40);
  90         fname_len                         = IVAL(params, 44);
  91         io->ntcreatex.in.impersonation    = IVAL(params, 48);
  92         io->ntcreatex.in.security_flags   = CVAL(params, 52);
  93         io->ntcreatex.in.sec_desc         = NULL;
  94         io->ntcreatex.in.ea_list          = NULL;
  95
  96         req_pull_string(req, &io->ntcreatex.in.fname,
  97                         params + 54,
  98                         trans->in.params.length - 54,
  99                         STR_NO_RANGE_CHECK | STR_TERMINATE);
 100         if (!io->ntcreatex.in.fname) {
 101                 return NT_STATUS_INVALID_PARAMETER;
 102         }
 103
 104         if (sd_length > trans->in.data.length ||
 105             ea_length > trans->in.data.length ||
 106             (sd_length+ea_length) > trans->in.data.length) {
 107                 return NT_STATUS_INVALID_PARAMETER;
 108         }
 109
 110         /* this call has an optional security descriptor */
 111         if (sd_length != 0) {
 112                 DATA_BLOB blob;
 113                 blob.data = trans->in.data.data;
 114                 blob.length = sd_length;
 115                 io->ntcreatex.in.sec_desc = talloc(io, struct security_descriptor);
 116                 if (io->ntcreatex.in.sec_desc == NULL) {
 117                         return NT_STATUS_NO_MEMORY;
 118                 }
 119                 status = ndr_pull_struct_blob(&blob, io,
 120                                               io->ntcreatex.in.sec_desc,
 121                                               (ndr_pull_flags_fn_t)ndr_pull_security_descriptor);
 122                 if (!NT_STATUS_IS_OK(status)) {
 123                         return status;
 124                 }
 125         }
 126
 127         /* and an optional ea_list */
 128         if (ea_length > 4) {
 129                 DATA_BLOB blob;
 130                 blob.data = trans->in.data.data + sd_length;
 131                 blob.length = ea_length;
 132                 io->ntcreatex.in.ea_list = talloc(io, struct smb_ea_list);
 133                 if (io->ntcreatex.in.ea_list == NULL) {
 134                         return NT_STATUS_NO_MEMORY;
 135                 }
 136
 137                 status = ea_pull_list_chained(&blob, io,
 138                                               &io->ntcreatex.in.ea_list->num_eas,
 139                                               &io->ntcreatex.in.ea_list->eas);
 140                 if (!NT_STATUS_IS_OK(status)) {
 141                         return status;
 142                 }
 143         }
 144
 145         /* call the backend - notice that we do it sync for now, until we support
 146            async nttrans requests */
 147         status = ntvfs_openfile(req, io);
 148         if (!NT_STATUS_IS_OK(status)) {
 149                 return status;
 150         }
 151
 152         trans->out.setup_count = 0;
 153         trans->out.setup       = NULL;
 154         trans->out.params      = data_blob_talloc(req, NULL, 69);
 155         trans->out.data        = data_blob(NULL, 0);
 156
 157         params = trans->out.params.data;
 158         if (params == NULL) {
 159                 return NT_STATUS_NO_MEMORY;
 160         }
 161
 162         SSVAL(params,        0, io->ntcreatex.out.oplock_level);
 163         SSVAL(params,        2, io->ntcreatex.out.fnum);
 164         SIVAL(params,        4, io->ntcreatex.out.create_action);
 165         SIVAL(params,        8, 0); /* ea error offset */
 166         push_nttime(params, 12, io->ntcreatex.out.create_time);
 167         push_nttime(params, 20, io->ntcreatex.out.access_time);
 168         push_nttime(params, 28, io->ntcreatex.out.write_time);
 169         push_nttime(params, 36, io->ntcreatex.out.change_time);
 170         SIVAL(params,       44, io->ntcreatex.out.attrib);
 171         SBVAL(params,       48, io->ntcreatex.out.alloc_size);
 172         SBVAL(params,       56, io->ntcreatex.out.size);
 173         SSVAL(params,       64, io->ntcreatex.out.file_type);
 174         SSVAL(params,       66, io->ntcreatex.out.ipc_state);
 175         SCVAL(params,       68, io->ntcreatex.out.is_directory);
 176
 177         return NT_STATUS_OK;
 178 }
 179
 180
 181 /*
 182    parse NTTRANS_QUERY_SEC_DESC request
 183  */
 184 static NTSTATUS nttrans_query_sec_desc(struct smbsrv_request *req,
 185                                        struct smb_nttrans *trans)
 186 {
 187         union smb_fileinfo *io;
 188         NTSTATUS status;
 189
 190         if (trans->in.params.length < 8) {
 191                 return NT_STATUS_INVALID_PARAMETER;
 192         }
 193
 194         /* parse the request */
 195         io = talloc(req, union smb_fileinfo);
 196         if (io == NULL) {
 197                 return NT_STATUS_NO_MEMORY;
 198         }
 199
 200         io->query_secdesc.level            = RAW_FILEINFO_SEC_DESC;
 201         io->query_secdesc.in.fnum          = SVAL(trans->in.params.data, 0);
 202         io->query_secdesc.secinfo_flags    = IVAL(trans->in.params.data, 4);
 203
 204         /* call the backend - notice that we do it sync for now, until we support
 205            async nttrans requests */
 206         status = ntvfs_qfileinfo(req, io);
 207         if (!NT_STATUS_IS_OK(status)) {
 208                 return status;
 209         }
 210
 211         trans->out.setup_count = 0;
 212         trans->out.setup       = NULL;
 213         trans->out.params      = data_blob_talloc(req, NULL, 4);
 214         trans->out.data        = data_blob(NULL, 0);
 215
 216         status = ndr_push_struct_blob(&trans->out.data, req,
 217                                       io->query_secdesc.out.sd,
 218                                       (ndr_push_flags_fn_t)ndr_push_security_descriptor);
 219         if (!NT_STATUS_IS_OK(status)) {
 220                 return status;
 221         }
 222
 223         SIVAL(trans->out.params.data, 0, trans->out.data.length);
 224
 225         return NT_STATUS_OK;
 226 }
 227
 228
 229 /*
 230    parse NTTRANS_SET_SEC_DESC request
 231  */
 232 static NTSTATUS nttrans_set_sec_desc(struct smbsrv_request *req,
 233                                        struct smb_nttrans *trans)
 234 {
 235         union smb_setfileinfo *io;
 236         NTSTATUS status;
 237
 238         if (trans->in.params.length < 8) {
 239                 return NT_STATUS_INVALID_PARAMETER;
 240         }
 241
 242         /* parse the request */
 243         io = talloc(req, union smb_setfileinfo);
 244         if (io == NULL) {
 245                 return NT_STATUS_NO_MEMORY;
 246         }
 247
 248         io->set_secdesc.level            = RAW_SFILEINFO_SEC_DESC;
 249         io->set_secdesc.file.fnum        = SVAL(trans->in.params.data, 0);
 250         io->set_secdesc.in.secinfo_flags = IVAL(trans->in.params.data, 4);
 251
 252         io->set_secdesc.in.sd = talloc(io, struct security_descriptor);
 253         if (io->set_secdesc.in.sd == NULL) {
 254                 return NT_STATUS_NO_MEMORY;
 255         }
 256
 257         status = ndr_pull_struct_blob(&trans->in.data, req,
 258                                       io->set_secdesc.in.sd,
 259                                       (ndr_pull_flags_fn_t)ndr_pull_security_descriptor);
 260         if (!NT_STATUS_IS_OK(status)) {
 261                 return status;
 262         }
 263
 264         /* call the backend - notice that we do it sync for now, until we support
 265            async nttrans requests */
 266         status = ntvfs_setfileinfo(req, io);
 267         if (!NT_STATUS_IS_OK(status)) {
 268                 return status;
 269         }
 270
 271         trans->out.setup_count = 0;
 272         trans->out.setup       = NULL;
 273         trans->out.params      = data_blob(NULL, 0);
 274         trans->out.data        = data_blob(NULL, 0);
 275
 276         return NT_STATUS_OK;
 277 }
 278
 279
 280 /* parse NTTRANS_RENAME request
 281  */
 282 static NTSTATUS nttrans_rename(struct smbsrv_request *req,
 283                                struct smb_nttrans *trans)
 284 {
 285         return NT_STATUS_FOOBAR;
 286 }
 287
 288 /*
 289    parse NTTRANS_IOCTL request
 290  */
 291 static NTSTATUS nttrans_ioctl(struct smbsrv_request *req,
 292                 struct smb_nttrans *trans)
 293 {
 294         union smb_ioctl nt;
 295         uint32_t function;
 296         uint16_t fnum;
 297         uint8_t filter;
 298         BOOL fsctl;
 299         DATA_BLOB *blob;
 300
 301         /* should have at least 4 setup words */
 302         if (trans->in.setup_count != 4) {
 303                 return NT_STATUS_INVALID_PARAMETER;
 304         }
 305
 306         function  = IVAL(trans->in.setup, 0);
 307         fnum  = SVAL(trans->in.setup, 4);
 308         fsctl = CVAL(trans->in.setup, 6);
 309         filter = CVAL(trans->in.setup, 7);
 310
 311         blob = &trans->in.data;
 312
 313         nt.ntioctl.level = RAW_IOCTL_NTIOCTL;
 314         nt.ntioctl.in.fnum = fnum;
 315         nt.ntioctl.in.function = function;
 316         nt.ntioctl.in.fsctl = fsctl;
 317         nt.ntioctl.in.filter = filter;
 318
 319         nttrans_setup_reply(req, trans, 0, 0, 1);
 320         trans->out.setup[0] = 0;
 321
 322         return ntvfs_ioctl(req, &nt);
 323 }
 324
 325 /*
 326   backend for nttrans requests
 327 */
 328 static NTSTATUS nttrans_backend(struct smbsrv_request *req,
 329                 struct smb_nttrans *trans)
 330 {
 331         /* the nttrans command is in function */
 332         switch (trans->in.function) {
 333         case NT_TRANSACT_CREATE:
 334                 return nttrans_create(req, trans);
 335         case NT_TRANSACT_IOCTL:
 336                 return nttrans_ioctl(req, trans);
 337         case NT_TRANSACT_RENAME:
 338                 return nttrans_rename(req, trans);
 339         case NT_TRANSACT_QUERY_SECURITY_DESC:
 340                 return nttrans_query_sec_desc(req, trans);
 341         case NT_TRANSACT_SET_SECURITY_DESC:
 342                 return nttrans_set_sec_desc(req, trans);
 343         }
 344
 345         /* an unknown nttrans command */
 346         return NT_STATUS_FOOBAR;
 347 }
 348
 349
 350 /****************************************************************************
 351  Reply to an SMBnttrans request
 352 ****************************************************************************/
 353 void reply_nttrans(struct smbsrv_request *req)
 354 {
 355         struct smb_nttrans trans;
 356         int i;
 357         uint16_t param_ofs, data_ofs;
 358         uint16_t param_count, data_count;
 359         uint16_t params_left, data_left;
 360         uint16_t param_total, data_total;
 361         uint8_t *params, *data;
 362         NTSTATUS status;
 363
 364         /* parse request */
 365         if (req->in.wct < 19) {
 366                 req_reply_error(req, NT_STATUS_FOOBAR);
 367                 return;
 368         }
 369
 370         trans.in.max_setup   = CVAL(req->in.vwv, 0);
 371         param_total          = IVAL(req->in.vwv, 3);
 372         data_total           = IVAL(req->in.vwv, 7);
 373         trans.in.max_param   = IVAL(req->in.vwv, 11);
 374         trans.in.max_data    = IVAL(req->in.vwv, 15);
 375         param_count          = IVAL(req->in.vwv, 19);
 376         param_ofs            = IVAL(req->in.vwv, 23);
 377         data_count           = IVAL(req->in.vwv, 27);
 378         data_ofs             = IVAL(req->in.vwv, 31);
 379         trans.in.setup_count = CVAL(req->in.vwv, 35);
 380         trans.in.function        = SVAL(req->in.vwv, 36);
 381
 382         if (req->in.wct != 19 + trans.in.setup_count) {
 383                 req_reply_dos_error(req, ERRSRV, ERRerror);
 384                 return;
 385         }
 386
 387         /* parse out the setup words */
 388         trans.in.setup = talloc_array(req, uint16_t, trans.in.setup_count);
 389         if (!trans.in.setup) {
 390                 req_reply_error(req, NT_STATUS_NO_MEMORY);
 391                 return;
 392         }
 393         for (i=0;i<trans.in.setup_count;i++) {
 394                 trans.in.setup[i] = SVAL(req->in.vwv, VWV(19+i));
 395         }
 396
 397         if (!req_pull_blob(req, req->in.hdr + param_ofs, param_count, &trans.in.params) ||
 398             !req_pull_blob(req, req->in.hdr + data_ofs, data_count, &trans.in.data)) {
 399                 req_reply_error(req, NT_STATUS_FOOBAR);
 400                 return;
 401         }
 402
 403         /* is it a partial request? if so, then send a 'send more' message */
 404         if (param_total > param_count ||
 405             data_total > data_count) {
 406                 DEBUG(0,("REWRITE: not handling partial nttrans requests!\n"));
 407                 return;
 408         }
 409
 410         /* its a full request, give it to the backend */
 411         status = nttrans_backend(req, &trans);
 412
 413         if (NT_STATUS_IS_ERR(status)) {
 414                 req_reply_error(req, status);
 415                 return;
 416         }
 417
 418 #if 0
 419         /* w2k3 does not check the max_setup count */
 420         if (trans.out.setup_count > trans.in.max_setup) {
 421                 req_reply_error(req, NT_STATUS_BUFFER_TOO_SMALL);
 422                 return;
 423         }
 424 #endif
 425         if (trans.out.params.length > trans.in.max_param) {
 426                 status = NT_STATUS_BUFFER_TOO_SMALL;
 427                 trans.out.params.length = trans.in.max_param;
 428         }
 429         if (trans.out.data.length > trans.in.max_data) {
 430                 status = NT_STATUS_BUFFER_TOO_SMALL;
 431                 trans.out.data.length = trans.in.max_data;
 432         }
 433
 434         params_left = trans.out.params.length;
 435         data_left   = trans.out.data.length;
 436         params      = trans.out.params.data;
 437         data        = trans.out.data.data;
 438
 439         req_setup_reply(req, 18 + trans.out.setup_count, 0);
 440
 441         if (!NT_STATUS_IS_OK(status)) {
 442                 req_setup_error(req, status);
 443         }
 444
 445         /* we need to divide up the reply into chunks that fit into
 446            the negotiated buffer size */
 447         do {
 448                 uint16_t this_data, this_param, max_bytes;
 449                 uint_t align1 = 1, align2 = (params_left ? 2 : 0);
 450                 struct smbsrv_request *this_req;
 451
 452                 max_bytes = req_max_data(req) - (align1 + align2);
 453
 454                 this_param = params_left;
 455                 if (this_param > max_bytes) {
 456                         this_param = max_bytes;
 457                 }
 458                 max_bytes -= this_param;
 459
 460                 this_data = data_left;
 461                 if (this_data > max_bytes) {
 462                         this_data = max_bytes;
 463                 }
 464
 465                 /* don't destroy unless this is the last chunk */
 466                 if (params_left - this_param != 0 ||
 467                     data_left - this_data != 0) {
 468                         this_req = req_setup_secondary(req);
 469                 } else {
 470                         this_req = req;
 471                 }
 472
 473                 req_grow_data(req, this_param + this_data + (align1 + align2));
 474
 475                 SSVAL(this_req->out.vwv, 0, 0); /* reserved */
 476                 SCVAL(this_req->out.vwv, 2, 0); /* reserved */
 477                 SIVAL(this_req->out.vwv, 3, trans.out.params.length);
 478                 SIVAL(this_req->out.vwv, 7, trans.out.data.length);
 479
 480                 SIVAL(this_req->out.vwv, 11, this_param);
 481                 SIVAL(this_req->out.vwv, 15, align1 + PTR_DIFF(this_req->out.data, this_req->out.hdr));
 482                 SIVAL(this_req->out.vwv, 19, PTR_DIFF(params, trans.out.params.data));
 483
 484                 SIVAL(this_req->out.vwv, 23, this_data);
 485                 SIVAL(this_req->out.vwv, 27, align1 + align2 +
 486                       PTR_DIFF(this_req->out.data + this_param, this_req->out.hdr));
 487                 SIVAL(this_req->out.vwv, 31, PTR_DIFF(data, trans.out.data.data));
 488
 489                 SCVAL(this_req->out.vwv, 35, trans.out.setup_count);
 490                 for (i=0;i<trans.out.setup_count;i++) {
 491                         SSVAL(this_req->out.vwv, VWV(18+i), trans.out.setup[i]);
 492                 }
 493
 494                 memset(this_req->out.data, 0, align1);
 495                 if (this_param != 0) {
 496                         memcpy(this_req->out.data + align1, params, this_param);
 497                 }
 498                 memset(this_req->out.data+this_param+align1, 0, align2);
 499                 if (this_data != 0) {
 500                         memcpy(this_req->out.data+this_param+align1+align2,
 501                                data, this_data);
 502                 }
 503
 504                 params_left -= this_param;
 505                 data_left -= this_data;
 506                 params += this_param;
 507                 data += this_data;
 508
 509                 req_send_reply(this_req);
 510         } while (params_left != 0 || data_left != 0);
 511 }
 512
 513
 514 /****************************************************************************
 515  Reply to an SMBnttranss request
 516 ****************************************************************************/
 517 void reply_nttranss(struct smbsrv_request *req)
 518 {
 519         req_reply_error(req, NT_STATUS_FOOBAR);
 520 }