source3/smbd/smb2_create.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Core SMB2 server
   4
   5    Copyright (C) Stefan Metzmacher 2009
   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 3 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, see <http://www.gnu.org/licenses/>.
  19 */
  20
  21 #include "includes.h"
  22 #include "smbd/globals.h"
  23 #include "../libcli/smb/smb_common.h"
  24
  25 static struct tevent_req *smbd_smb2_create_send(TALLOC_CTX *mem_ctx,
  26                         struct tevent_context *ev,
  27                         struct smbd_smb2_request *smb2req,
  28                         uint8_t in_oplock_level,
  29                         uint32_t in_impersonation_level,
  30                         uint32_t in_desired_access,
  31                         uint32_t in_file_attributes,
  32                         uint32_t in_share_access,
  33                         uint32_t in_create_disposition,
  34                         uint32_t in_create_options,
  35                         const char *in_name,
  36                         struct smb2_create_blobs in_context_blobs);
  37 static NTSTATUS smbd_smb2_create_recv(struct tevent_req *req,
  38                         TALLOC_CTX *mem_ctx,
  39                         uint8_t *out_oplock_level,
  40                         uint32_t *out_create_action,
  41                         NTTIME *out_creation_time,
  42                         NTTIME *out_last_access_time,
  43                         NTTIME *out_last_write_time,
  44                         NTTIME *out_change_time,
  45                         uint64_t *out_allocation_size,
  46                         uint64_t *out_end_of_file,
  47                         uint32_t *out_file_attributes,
  48                         uint64_t *out_file_id_volatile,
  49                         struct smb2_create_blobs *out_context_blobs);
  50
  51 static void smbd_smb2_request_create_done(struct tevent_req *subreq);
  52 NTSTATUS smbd_smb2_request_process_create(struct smbd_smb2_request *req)
  53 {
  54         const uint8_t *inbody;
  55         int i = req->current_idx;
  56         size_t expected_body_size = 0x39;
  57         size_t body_size;
  58         uint8_t in_oplock_level;
  59         uint32_t in_impersonation_level;
  60         uint32_t in_desired_access;
  61         uint32_t in_file_attributes;
  62         uint32_t in_share_access;
  63         uint32_t in_create_disposition;
  64         uint32_t in_create_options;
  65         uint16_t in_name_offset;
  66         uint16_t in_name_length;
  67         DATA_BLOB in_name_buffer;
  68         char *in_name_string;
  69         size_t in_name_string_size;
  70         uint32_t name_offset = 0;
  71         uint32_t name_available_length = 0;
  72         uint32_t in_context_offset;
  73         uint32_t in_context_length;
  74         DATA_BLOB in_context_buffer;
  75         struct smb2_create_blobs in_context_blobs;
  76         uint32_t context_offset = 0;
  77         uint32_t context_available_length = 0;
  78         uint32_t dyn_offset;
  79         NTSTATUS status;
  80         bool ok;
  81         struct tevent_req *subreq;
  82
  83         if (req->in.vector[i+1].iov_len != (expected_body_size & 0xFFFFFFFE)) {
  84                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  85         }
  86
  87         inbody = (const uint8_t *)req->in.vector[i+1].iov_base;
  88
  89         body_size = SVAL(inbody, 0x00);
  90         if (body_size != expected_body_size) {
  91                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  92         }
  93
  94         in_oplock_level         = CVAL(inbody, 0x03);
  95         in_impersonation_level  = IVAL(inbody, 0x04);
  96         in_desired_access       = IVAL(inbody, 0x18);
  97         in_file_attributes      = IVAL(inbody, 0x1C);
  98         in_share_access         = IVAL(inbody, 0x20);
  99         in_create_disposition   = IVAL(inbody, 0x24);
 100         in_create_options       = IVAL(inbody, 0x28);
 101         in_name_offset          = SVAL(inbody, 0x2C);
 102         in_name_length          = SVAL(inbody, 0x2E);
 103         in_context_offset       = IVAL(inbody, 0x30);
 104         in_context_length       = IVAL(inbody, 0x34);
 105
 106         /*
 107          * First check if the dynamic name and context buffers
 108          * are correctly specified.
 109          *
 110          * Note: That we don't check if the name and context buffers
 111          *       overlap
 112          */
 113
 114         dyn_offset = SMB2_HDR_BODY + (body_size & 0xFFFFFFFE);
 115
 116         if (in_name_offset == 0 && in_name_length == 0) {
 117                 /* This is ok */
 118                 name_offset = 0;
 119         } else if (in_name_offset < dyn_offset) {
 120                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
 121         } else {
 122                 name_offset = in_name_offset - dyn_offset;
 123         }
 124
 125         if (name_offset > req->in.vector[i+2].iov_len) {
 126                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
 127         }
 128
 129         name_available_length = req->in.vector[i+2].iov_len - name_offset;
 130
 131         if (in_name_length > name_available_length) {
 132                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
 133         }
 134
 135         in_name_buffer.data = (uint8_t *)req->in.vector[i+2].iov_base +
 136                               name_offset;
 137         in_name_buffer.length = in_name_length;
 138
 139         if (in_context_offset == 0 && in_context_length == 0) {
 140                 /* This is ok */
 141                 context_offset = 0;
 142         } else if (in_context_offset < dyn_offset) {
 143                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
 144         } else {
 145                 context_offset = in_context_offset - dyn_offset;
 146         }
 147
 148         if (context_offset > req->in.vector[i+2].iov_len) {
 149                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
 150         }
 151
 152         context_available_length = req->in.vector[i+2].iov_len - context_offset;
 153
 154         if (in_context_length > context_available_length) {
 155                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
 156         }
 157
 158         in_context_buffer.data = (uint8_t *)req->in.vector[i+2].iov_base +
 159                                   context_offset;
 160         in_context_buffer.length = in_context_length;
 161
 162         /*
 163          * Now interpret the name and context buffers
 164          */
 165
 166         ok = convert_string_talloc(req, CH_UTF16, CH_UNIX,
 167                                    in_name_buffer.data,
 168                                    in_name_buffer.length,
 169                                    &in_name_string,
 170                                    &in_name_string_size, false);
 171         if (!ok) {
 172                 return smbd_smb2_request_error(req, NT_STATUS_ILLEGAL_CHARACTER);
 173         }
 174
 175         ZERO_STRUCT(in_context_blobs);
 176         status = smb2_create_blob_parse(req, in_context_buffer, &in_context_blobs);
 177         if (!NT_STATUS_IS_OK(status)) {
 178                 return smbd_smb2_request_error(req, status);
 179         }
 180
 181         subreq = smbd_smb2_create_send(req,
 182                                        req->sconn->smb2.event_ctx,
 183                                        req,
 184                                        in_oplock_level,
 185                                        in_impersonation_level,
 186                                        in_desired_access,
 187                                        in_file_attributes,
 188                                        in_share_access,
 189                                        in_create_disposition,
 190                                        in_create_options,
 191                                        in_name_string,
 192                                        in_context_blobs);
 193         if (subreq == NULL) {
 194                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 195         }
 196         tevent_req_set_callback(subreq, smbd_smb2_request_create_done, req);
 197
 198         return smbd_smb2_request_pending_queue(req, subreq);
 199 }
 200
 201 static void smbd_smb2_request_create_done(struct tevent_req *subreq)
 202 {
 203         struct smbd_smb2_request *req = tevent_req_callback_data(subreq,
 204                                         struct smbd_smb2_request);
 205         int i = req->current_idx;
 206         uint8_t *outhdr;
 207         DATA_BLOB outbody;
 208         DATA_BLOB outdyn;
 209         uint8_t out_oplock_level = 0;
 210         uint32_t out_create_action = 0;
 211         NTTIME out_creation_time = 0;
 212         NTTIME out_last_access_time = 0;
 213         NTTIME out_last_write_time = 0;
 214         NTTIME out_change_time = 0;
 215         uint64_t out_allocation_size = 0;
 216         uint64_t out_end_of_file = 0;
 217         uint32_t out_file_attributes = 0;
 218         uint64_t out_file_id_volatile = 0;
 219         struct smb2_create_blobs out_context_blobs;
 220         DATA_BLOB out_context_buffer;
 221         uint16_t out_context_buffer_offset = 0;
 222         NTSTATUS status;
 223         NTSTATUS error; /* transport error */
 224
 225         status = smbd_smb2_create_recv(subreq,
 226                                        req,
 227                                        &out_oplock_level,
 228                                        &out_create_action,
 229                                        &out_creation_time,
 230                                        &out_last_access_time,
 231                                        &out_last_write_time,
 232                                        &out_change_time,
 233                                        &out_allocation_size,
 234                                        &out_end_of_file,
 235                                        &out_file_attributes,
 236                                        &out_file_id_volatile,
 237                                        &out_context_blobs);
 238         TALLOC_FREE(subreq);
 239         if (!NT_STATUS_IS_OK(status)) {
 240                 error = smbd_smb2_request_error(req, status);
 241                 if (!NT_STATUS_IS_OK(error)) {
 242                         smbd_server_connection_terminate(req->sconn,
 243                                                          nt_errstr(error));
 244                         return;
 245                 }
 246                 return;
 247         }
 248
 249         status = smb2_create_blob_push(req, &out_context_buffer, out_context_blobs);
 250         if (!NT_STATUS_IS_OK(status)) {
 251                 error = smbd_smb2_request_error(req, status);
 252                 if (!NT_STATUS_IS_OK(error)) {
 253                         smbd_server_connection_terminate(req->sconn,
 254                                                          nt_errstr(error));
 255                         return;
 256                 }
 257                 return;
 258         }
 259
 260         if (out_context_buffer.length > 0) {
 261                 out_context_buffer_offset = SMB2_HDR_BODY + 0x58;
 262         }
 263
 264         outhdr = (uint8_t *)req->out.vector[i].iov_base;
 265
 266         outbody = data_blob_talloc(req->out.vector, NULL, 0x58);
 267         if (outbody.data == NULL) {
 268                 error = smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 269                 if (!NT_STATUS_IS_OK(error)) {
 270                         smbd_server_connection_terminate(req->sconn,
 271                                                          nt_errstr(error));
 272                         return;
 273                 }
 274                 return;
 275         }
 276
 277         SSVAL(outbody.data, 0x00, 0x58 + 1);    /* struct size */
 278         SCVAL(outbody.data, 0x02,
 279               out_oplock_level);                /* oplock level */
 280         SCVAL(outbody.data, 0x03, 0);           /* reserved */
 281         SIVAL(outbody.data, 0x04,
 282               out_create_action);               /* create action */
 283         SBVAL(outbody.data, 0x08,
 284               out_creation_time);               /* creation time */
 285         SBVAL(outbody.data, 0x10,
 286               out_last_access_time);            /* last access time */
 287         SBVAL(outbody.data, 0x18,
 288               out_last_write_time);             /* last write time */
 289         SBVAL(outbody.data, 0x20,
 290               out_change_time);                 /* change time */
 291         SBVAL(outbody.data, 0x28,
 292               out_allocation_size);             /* allocation size */
 293         SBVAL(outbody.data, 0x30,
 294               out_end_of_file);                 /* end of file */
 295         SIVAL(outbody.data, 0x38,
 296               out_file_attributes);             /* file attributes */
 297         SIVAL(outbody.data, 0x3C, 0);           /* reserved */
 298         SBVAL(outbody.data, 0x40, 0);           /* file id (persistent) */
 299         SBVAL(outbody.data, 0x48,
 300               out_file_id_volatile);            /* file id (volatile) */
 301         SIVAL(outbody.data, 0x50,
 302               out_context_buffer_offset);       /* create contexts offset */
 303         SIVAL(outbody.data, 0x54,
 304               out_context_buffer.length);       /* create contexts length */
 305
 306         outdyn = out_context_buffer;
 307
 308         error = smbd_smb2_request_done(req, outbody, &outdyn);
 309         if (!NT_STATUS_IS_OK(error)) {
 310                 smbd_server_connection_terminate(req->sconn,
 311                                                  nt_errstr(error));
 312                 return;
 313         }
 314 }
 315
 316 struct smbd_smb2_create_state {
 317         struct smbd_smb2_request *smb2req;
 318         uint8_t out_oplock_level;
 319         uint32_t out_create_action;
 320         NTTIME out_creation_time;
 321         NTTIME out_last_access_time;
 322         NTTIME out_last_write_time;
 323         NTTIME out_change_time;
 324         uint64_t out_allocation_size;
 325         uint64_t out_end_of_file;
 326         uint32_t out_file_attributes;
 327         uint64_t out_file_id_volatile;
 328         struct smb2_create_blobs out_context_blobs;
 329 };
 330
 331 static struct tevent_req *smbd_smb2_create_send(TALLOC_CTX *mem_ctx,
 332                         struct tevent_context *ev,
 333                         struct smbd_smb2_request *smb2req,
 334                         uint8_t in_oplock_level,
 335                         uint32_t in_impersonation_level,
 336                         uint32_t in_desired_access,
 337                         uint32_t in_file_attributes,
 338                         uint32_t in_share_access,
 339                         uint32_t in_create_disposition,
 340                         uint32_t in_create_options,
 341                         const char *in_name,
 342                         struct smb2_create_blobs in_context_blobs)
 343 {
 344         struct tevent_req *req;
 345         struct smbd_smb2_create_state *state;
 346         NTSTATUS status;
 347         struct smb_request *smbreq;
 348         files_struct *result;
 349         int info;
 350         SMB_STRUCT_STAT sbuf;
 351         struct smb2_create_blobs out_context_blobs;
 352
 353         ZERO_STRUCT(out_context_blobs);
 354
 355         req = tevent_req_create(mem_ctx, &state,
 356                                 struct smbd_smb2_create_state);
 357         if (req == NULL) {
 358                 return NULL;
 359         }
 360         state->smb2req = smb2req;
 361
 362         DEBUG(10,("smbd_smb2_create: name[%s]\n",
 363                   in_name));
 364
 365         smbreq = smbd_smb2_fake_smb_request(smb2req);
 366         if (tevent_req_nomem(smbreq, req)) {
 367                 return tevent_req_post(req, ev);
 368         }
 369
 370         if (IS_IPC(smbreq->conn)) {
 371                 const char *pipe_name = in_name;
 372
 373                 if (!lp_nt_pipe_support()) {
 374                         tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
 375                         return tevent_req_post(req, ev);
 376                 }
 377
 378                 /* Strip \\ off the name. */
 379                 if (pipe_name[0] == '\\') {
 380                         pipe_name++;
 381                 }
 382
 383                 status = open_np_file(smbreq, pipe_name, &result);
 384                 if (!NT_STATUS_IS_OK(status)) {
 385                         tevent_req_nterror(req, status);
 386                         return tevent_req_post(req, ev);
 387                 }
 388                 info = FILE_WAS_OPENED;
 389                 ZERO_STRUCT(sbuf);
 390         } else if (CAN_PRINT(smbreq->conn)) {
 391                 status = file_new(smbreq, smbreq->conn, &result);
 392                 if(!NT_STATUS_IS_OK(status)) {
 393                         tevent_req_nterror(req, status);
 394                         return tevent_req_post(req, ev);
 395                 }
 396
 397                 status = print_fsp_open(smbreq,
 398                                         smbreq->conn,
 399                                         in_name,
 400                                         smbreq->vuid,
 401                                         result,
 402                                         &sbuf);
 403                 if (!NT_STATUS_IS_OK(status)) {
 404                         file_free(smbreq, result);
 405                         tevent_req_nterror(req, status);
 406                         return tevent_req_post(req, ev);
 407                 }
 408                 info = FILE_WAS_CREATED;
 409         } else {
 410                 char *fname;
 411                 struct smb_filename *smb_fname = NULL;
 412
 413                 /* these are ignored for SMB2 */
 414                 in_create_options &= ~(0x10);/* NTCREATEX_OPTIONS_SYNC_ALERT */
 415                 in_create_options &= ~(0x20);/* NTCREATEX_OPTIONS_ASYNC_ALERT */
 416
 417                 fname = talloc_strdup(state, in_name);
 418                 if (tevent_req_nomem(fname, req)) {
 419                         return tevent_req_post(req, ev);
 420                 }
 421
 422                 /* convert '\\' into '/' */
 423                 status = check_path_syntax(fname);
 424                 if (!NT_STATUS_IS_OK(status)) {
 425                         tevent_req_nterror(req, status);
 426                         return tevent_req_post(req, ev);
 427                 }
 428
 429                 status = filename_convert(req,
 430                                           smbreq->conn,
 431                                           smbreq->flags2 & FLAGS2_DFS_PATHNAMES,
 432                                           fname,
 433                                           0,
 434                                           NULL,
 435                                           &smb_fname);
 436                 if (!NT_STATUS_IS_OK(status)) {
 437                         tevent_req_nterror(req, status);
 438                         return tevent_req_post(req, ev);
 439                 }
 440
 441                 status = SMB_VFS_CREATE_FILE(smbreq->conn,
 442                                              smbreq,
 443                                              0, /* root_dir_fid */
 444                                              smb_fname,
 445                                              in_desired_access,
 446                                              in_share_access,
 447                                              in_create_disposition,
 448                                              in_create_options,
 449                                              in_file_attributes,
 450                                              0, /* oplock_request */
 451                                              0, /* allocation_size */
 452                                              NULL, /* security_descriptor */
 453                                              NULL, /* ea_list */
 454                                              &result,
 455                                              &info);
 456                 if (!NT_STATUS_IS_OK(status)) {
 457                         tevent_req_nterror(req, status);
 458                         return tevent_req_post(req, ev);
 459                 }
 460                 sbuf = smb_fname->st;
 461         }
 462
 463         smb2req->compat_chain_fsp = smbreq->chain_fsp;
 464
 465         state->out_oplock_level = 0;
 466         if ((in_create_disposition == FILE_SUPERSEDE)
 467             && (info == FILE_WAS_OVERWRITTEN)) {
 468                 state->out_create_action = FILE_WAS_SUPERSEDED;
 469         } else {
 470                 state->out_create_action = info;
 471         }
 472         unix_timespec_to_nt_time(&state->out_creation_time, sbuf.st_ex_btime);
 473         unix_timespec_to_nt_time(&state->out_last_access_time, sbuf.st_ex_atime);
 474         unix_timespec_to_nt_time(&state->out_last_write_time,sbuf.st_ex_mtime);
 475         unix_timespec_to_nt_time(&state->out_change_time, sbuf.st_ex_ctime);
 476         state->out_allocation_size      = sbuf.st_ex_blksize * sbuf.st_ex_blocks;
 477         state->out_end_of_file          = sbuf.st_ex_size;
 478         state->out_file_attributes      = dos_mode(result->conn,
 479                                                    result->fsp_name);
 480         if (state->out_file_attributes == 0) {
 481                 state->out_file_attributes = FILE_ATTRIBUTE_NORMAL;
 482         }
 483         state->out_file_id_volatile = result->fnum;
 484         state->out_context_blobs = out_context_blobs;
 485
 486         tevent_req_done(req);
 487         return tevent_req_post(req, ev);
 488 }
 489
 490 static NTSTATUS smbd_smb2_create_recv(struct tevent_req *req,
 491                         TALLOC_CTX *mem_ctx,
 492                         uint8_t *out_oplock_level,
 493                         uint32_t *out_create_action,
 494                         NTTIME *out_creation_time,
 495                         NTTIME *out_last_access_time,
 496                         NTTIME *out_last_write_time,
 497                         NTTIME *out_change_time,
 498                         uint64_t *out_allocation_size,
 499                         uint64_t *out_end_of_file,
 500                         uint32_t *out_file_attributes,
 501                         uint64_t *out_file_id_volatile,
 502                         struct smb2_create_blobs *out_context_blobs)
 503 {
 504         NTSTATUS status;
 505         struct smbd_smb2_create_state *state = tevent_req_data(req,
 506                                                struct smbd_smb2_create_state);
 507
 508         if (tevent_req_is_nterror(req, &status)) {
 509                 tevent_req_received(req);
 510                 return status;
 511         }
 512
 513         *out_oplock_level       = state->out_oplock_level;
 514         *out_create_action      = state->out_create_action;
 515         *out_creation_time      = state->out_creation_time;
 516         *out_last_access_time   = state->out_last_access_time;
 517         *out_last_write_time    = state->out_last_write_time;
 518         *out_change_time        = state->out_change_time;
 519         *out_allocation_size    = state->out_allocation_size;
 520         *out_end_of_file        = state->out_end_of_file;
 521         *out_file_attributes    = state->out_file_attributes;
 522         *out_file_id_volatile   = state->out_file_id_volatile;
 523         *out_context_blobs      = state->out_context_blobs;
 524
 525         talloc_steal(mem_ctx, state->out_context_blobs.blobs);
 526
 527         tevent_req_received(req);
 528         return NT_STATUS_OK;
 529 }