source3/smbd/pipes.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Pipe SMB reply routines
   4    Copyright (C) Andrew Tridgell 1992-1998
   5    Copyright (C) Luke Kenneth Casson Leighton 1996-1998
   6    Copyright (C) Paul Ashton  1997-1998.
   7    Copyright (C) Jeremy Allison 2005.
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21 */
  22 /*
  23    This file handles reply_ calls on named pipes that the server
  24    makes to handle specific protocols
  25 */
  26
  27
  28 #include "includes.h"
  29 #include "smbd/globals.h"
  30
  31 #define PIPE            "\\PIPE\\"
  32 #define PIPELEN         strlen(PIPE)
  33
  34 #define MAX_PIPE_NAME_LEN       24
  35
  36 NTSTATUS open_np_file(struct smb_request *smb_req, const char *name,
  37                       struct files_struct **pfsp)
  38 {
  39         struct connection_struct *conn = smb_req->conn;
  40         struct files_struct *fsp;
  41         struct smb_filename *smb_fname = NULL;
  42         NTSTATUS status;
  43
  44         status = file_new(smb_req, conn, &fsp);
  45         if (!NT_STATUS_IS_OK(status)) {
  46                 DEBUG(0, ("file_new failed: %s\n", nt_errstr(status)));
  47                 return status;
  48         }
  49
  50         fsp->conn = conn;
  51         fsp->fh->fd = -1;
  52         fsp->vuid = smb_req->vuid;
  53         fsp->can_lock = false;
  54         fsp->access_mask = FILE_READ_DATA | FILE_WRITE_DATA;
  55
  56         status = create_synthetic_smb_fname(talloc_tos(), name, NULL, NULL,
  57                                             &smb_fname);
  58                 if (!NT_STATUS_IS_OK(status)) {
  59                 file_free(smb_req, fsp);
  60                 return status;
  61         }
  62         status = fsp_set_smb_fname(fsp, smb_fname);
  63         TALLOC_FREE(smb_fname);
  64         if (!NT_STATUS_IS_OK(status)) {
  65                 file_free(smb_req, fsp);
  66                 return status;
  67         }
  68
  69         status = np_open(fsp, name,
  70                          conn->sconn->local_address,
  71                          conn->sconn->remote_address,
  72                          conn->server_info, &fsp->fake_file_handle);
  73         if (!NT_STATUS_IS_OK(status)) {
  74                 DEBUG(10, ("np_open(%s) returned %s\n", name,
  75                            nt_errstr(status)));
  76                 file_free(smb_req, fsp);
  77                 return status;
  78         }
  79
  80         *pfsp = fsp;
  81
  82         return NT_STATUS_OK;
  83 }
  84
  85 /****************************************************************************
  86  Reply to an open and X on a named pipe.
  87  This code is basically stolen from reply_open_and_X with some
  88  wrinkles to handle pipes.
  89 ****************************************************************************/
  90
  91 void reply_open_pipe_and_X(connection_struct *conn, struct smb_request *req)
  92 {
  93         const char *fname = NULL;
  94         char *pipe_name = NULL;
  95         files_struct *fsp;
  96         TALLOC_CTX *ctx = talloc_tos();
  97         NTSTATUS status;
  98
  99         /* XXXX we need to handle passed times, sattr and flags */
 100         srvstr_pull_req_talloc(ctx, req, &pipe_name, req->buf, STR_TERMINATE);
 101         if (!pipe_name) {
 102                 reply_botherror(req, NT_STATUS_OBJECT_NAME_NOT_FOUND,
 103                                 ERRDOS, ERRbadpipe);
 104                 return;
 105         }
 106
 107         /* If the name doesn't start \PIPE\ then this is directed */
 108         /* at a mailslot or something we really, really don't understand, */
 109         /* not just something we really don't understand. */
 110         if ( strncmp(pipe_name,PIPE,PIPELEN) != 0 ) {
 111                 reply_nterror(req, NT_STATUS_ACCESS_DENIED);
 112                 return;
 113         }
 114
 115         DEBUG(4,("Opening pipe %s.\n", pipe_name));
 116
 117         /* Strip \PIPE\ off the name. */
 118         fname = pipe_name + PIPELEN;
 119
 120 #if 0
 121         /*
 122          * Hack for NT printers... JRA.
 123          */
 124         if(should_fail_next_srvsvc_open(fname)) {
 125                 reply_nterror(req, NT_STATUS_ACCESS_DENIED);
 126                 return;
 127         }
 128 #endif
 129
 130         status = open_np_file(req, fname, &fsp);
 131         if (!NT_STATUS_IS_OK(status)) {
 132                 if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
 133                         reply_botherror(req, NT_STATUS_OBJECT_NAME_NOT_FOUND,
 134                                         ERRDOS, ERRbadpipe);
 135                         return;
 136                 }
 137                 reply_nterror(req, status);
 138                 return;
 139         }
 140
 141         /* Prepare the reply */
 142         reply_outbuf(req, 15, 0);
 143
 144         /* Mark the opened file as an existing named pipe in message mode. */
 145         SSVAL(req->outbuf,smb_vwv9,2);
 146         SSVAL(req->outbuf,smb_vwv10,0xc700);
 147
 148         SSVAL(req->outbuf, smb_vwv2, fsp->fnum);
 149         SSVAL(req->outbuf, smb_vwv3, 0);        /* fmode */
 150         srv_put_dos_date3((char *)req->outbuf, smb_vwv4, 0);    /* mtime */
 151         SIVAL(req->outbuf, smb_vwv6, 0);        /* size */
 152         SSVAL(req->outbuf, smb_vwv8, 0);        /* rmode */
 153         SSVAL(req->outbuf, smb_vwv11, 0x0001);
 154
 155         chain_reply(req);
 156         return;
 157 }
 158
 159 /****************************************************************************
 160  Reply to a write on a pipe.
 161 ****************************************************************************/
 162
 163 struct pipe_write_state {
 164         size_t numtowrite;
 165 };
 166
 167 static void pipe_write_done(struct tevent_req *subreq);
 168
 169 void reply_pipe_write(struct smb_request *req)
 170 {
 171         files_struct *fsp = file_fsp(req, SVAL(req->vwv+0, 0));
 172         const uint8_t *data;
 173         struct pipe_write_state *state;
 174         struct tevent_req *subreq;
 175
 176         if (!fsp_is_np(fsp)) {
 177                 reply_nterror(req, NT_STATUS_INVALID_HANDLE);
 178                 return;
 179         }
 180
 181         if (fsp->vuid != req->vuid) {
 182                 reply_nterror(req, NT_STATUS_INVALID_HANDLE);
 183                 return;
 184         }
 185
 186         state = talloc(req, struct pipe_write_state);
 187         if (state == NULL) {
 188                 reply_nterror(req, NT_STATUS_NO_MEMORY);
 189                 return;
 190         }
 191         req->async_priv = state;
 192
 193         state->numtowrite = SVAL(req->vwv+1, 0);
 194
 195         data = req->buf + 3;
 196
 197         DEBUG(6, ("reply_pipe_write: %x name: %s len: %d\n", (int)fsp->fnum,
 198                   fsp_str_dbg(fsp), (int)state->numtowrite));
 199
 200         subreq = np_write_send(state, smbd_event_context(),
 201                                fsp->fake_file_handle, data, state->numtowrite);
 202         if (subreq == NULL) {
 203                 TALLOC_FREE(state);
 204                 reply_nterror(req, NT_STATUS_NO_MEMORY);
 205                 return;
 206         }
 207         tevent_req_set_callback(subreq, pipe_write_done,
 208                                 talloc_move(req->conn, &req));
 209 }
 210
 211 static void pipe_write_done(struct tevent_req *subreq)
 212 {
 213         struct smb_request *req = tevent_req_callback_data(
 214                 subreq, struct smb_request);
 215         struct pipe_write_state *state = talloc_get_type_abort(
 216                 req->async_priv, struct pipe_write_state);
 217         NTSTATUS status;
 218         ssize_t nwritten = -1;
 219
 220         status = np_write_recv(subreq, &nwritten);
 221         TALLOC_FREE(subreq);
 222         if (nwritten < 0) {
 223                 reply_nterror(req, status);
 224                 goto send;
 225         }
 226
 227         /* Looks bogus to me now. Needs to be removed ? JRA. */
 228         if ((nwritten == 0 && state->numtowrite != 0)) {
 229                 reply_nterror(req, NT_STATUS_ACCESS_DENIED);
 230                 goto send;
 231         }
 232
 233         reply_outbuf(req, 1, 0);
 234
 235         SSVAL(req->outbuf,smb_vwv0,nwritten);
 236
 237         DEBUG(3,("write-IPC nwritten=%d\n", (int)nwritten));
 238
 239  send:
 240         if (!srv_send_smb(smbd_server_fd(), (char *)req->outbuf,
 241                           true, req->seqnum+1,
 242                           IS_CONN_ENCRYPTED(req->conn)||req->encrypted,
 243                           &req->pcd)) {
 244                 exit_server_cleanly("construct_reply: srv_send_smb failed.");
 245         }
 246         TALLOC_FREE(req);
 247 }
 248
 249 /****************************************************************************
 250  Reply to a write and X.
 251
 252  This code is basically stolen from reply_write_and_X with some
 253  wrinkles to handle pipes.
 254 ****************************************************************************/
 255
 256 struct pipe_write_andx_state {
 257         bool pipe_start_message_raw;
 258         size_t numtowrite;
 259 };
 260
 261 static void pipe_write_andx_done(struct tevent_req *subreq);
 262
 263 void reply_pipe_write_and_X(struct smb_request *req)
 264 {
 265         files_struct *fsp = file_fsp(req, SVAL(req->vwv+2, 0));
 266         int smb_doff = SVAL(req->vwv+11, 0);
 267         uint8_t *data;
 268         struct pipe_write_andx_state *state;
 269         struct tevent_req *subreq;
 270
 271         if (!fsp_is_np(fsp)) {
 272                 reply_nterror(req, NT_STATUS_INVALID_HANDLE);
 273                 return;
 274         }
 275
 276         if (fsp->vuid != req->vuid) {
 277                 reply_nterror(req, NT_STATUS_INVALID_HANDLE);
 278                 return;
 279         }
 280
 281         state = talloc(req, struct pipe_write_andx_state);
 282         if (state == NULL) {
 283                 reply_nterror(req, NT_STATUS_NO_MEMORY);
 284                 return;
 285         }
 286         req->async_priv = state;
 287
 288         state->numtowrite = SVAL(req->vwv+10, 0);
 289         state->pipe_start_message_raw =
 290                 ((SVAL(req->vwv+7, 0) & (PIPE_START_MESSAGE|PIPE_RAW_MODE))
 291                  == (PIPE_START_MESSAGE|PIPE_RAW_MODE));
 292
 293         DEBUG(6, ("reply_pipe_write_and_X: %x name: %s len: %d\n",
 294                   (int)fsp->fnum, fsp_str_dbg(fsp), (int)state->numtowrite));
 295
 296         data = (uint8_t *)smb_base(req->inbuf) + smb_doff;
 297
 298         if (state->pipe_start_message_raw) {
 299                 /*
 300                  * For the start of a message in named pipe byte mode,
 301                  * the first two bytes are a length-of-pdu field. Ignore
 302                  * them (we don't trust the client). JRA.
 303                  */
 304                 if (state->numtowrite < 2) {
 305                         DEBUG(0,("reply_pipe_write_and_X: start of message "
 306                                  "set and not enough data sent.(%u)\n",
 307                                  (unsigned int)state->numtowrite ));
 308                         reply_nterror(req, NT_STATUS_INVALID_PARAMETER);
 309                         return;
 310                 }
 311
 312                 data += 2;
 313                 state->numtowrite -= 2;
 314         }
 315
 316         subreq = np_write_send(state, smbd_event_context(),
 317                                fsp->fake_file_handle, data, state->numtowrite);
 318         if (subreq == NULL) {
 319                 TALLOC_FREE(state);
 320                 reply_nterror(req, NT_STATUS_NO_MEMORY);
 321                 return;
 322         }
 323         tevent_req_set_callback(subreq, pipe_write_andx_done,
 324                                 talloc_move(req->conn, &req));
 325 }
 326
 327 static void pipe_write_andx_done(struct tevent_req *subreq)
 328 {
 329         struct smb_request *req = tevent_req_callback_data(
 330                 subreq, struct smb_request);
 331         struct pipe_write_andx_state *state = talloc_get_type_abort(
 332                 req->async_priv, struct pipe_write_andx_state);
 333         NTSTATUS status;
 334         ssize_t nwritten = -1;
 335
 336         status = np_write_recv(subreq, &nwritten);
 337         TALLOC_FREE(subreq);
 338
 339         if (!NT_STATUS_IS_OK(status)) {
 340                 reply_nterror(req, status);
 341                 goto done;
 342         }
 343
 344         /* Looks bogus to me now. Is this error message correct ? JRA. */
 345         if (nwritten != state->numtowrite) {
 346                 reply_nterror(req, NT_STATUS_ACCESS_DENIED);
 347                 goto done;
 348         }
 349
 350         reply_outbuf(req, 6, 0);
 351
 352         nwritten = (state->pipe_start_message_raw ? nwritten + 2 : nwritten);
 353         SSVAL(req->outbuf,smb_vwv2,nwritten);
 354
 355         DEBUG(3,("writeX-IPC nwritten=%d\n", (int)nwritten));
 356
 357  done:
 358         chain_reply(req);
 359         /*
 360          * We must free here as the ownership of req was
 361          * moved to the connection struct in reply_pipe_write_and_X().
 362          */
 363         TALLOC_FREE(req);
 364 }
 365
 366 /****************************************************************************
 367  Reply to a read and X.
 368  This code is basically stolen from reply_read_and_X with some
 369  wrinkles to handle pipes.
 370 ****************************************************************************/
 371
 372 struct pipe_read_andx_state {
 373         uint8_t *outbuf;
 374         int smb_mincnt;
 375         int smb_maxcnt;
 376 };
 377
 378 static void pipe_read_andx_done(struct tevent_req *subreq);
 379
 380 void reply_pipe_read_and_X(struct smb_request *req)
 381 {
 382         files_struct *fsp = file_fsp(req, SVAL(req->vwv+0, 0));
 383         uint8_t *data;
 384         struct pipe_read_andx_state *state;
 385         struct tevent_req *subreq;
 386
 387         /* we don't use the offset given to use for pipe reads. This
 388            is deliberate, instead we always return the next lump of
 389            data on the pipe */
 390 #if 0
 391         uint32 smb_offs = IVAL(req->vwv+3, 0);
 392 #endif
 393
 394         if (!fsp_is_np(fsp)) {
 395                 reply_nterror(req, NT_STATUS_INVALID_HANDLE);
 396                 return;
 397         }
 398
 399         if (fsp->vuid != req->vuid) {
 400                 reply_nterror(req, NT_STATUS_INVALID_HANDLE);
 401                 return;
 402         }
 403
 404         state = talloc(req, struct pipe_read_andx_state);
 405         if (state == NULL) {
 406                 reply_nterror(req, NT_STATUS_NO_MEMORY);
 407                 return;
 408         }
 409         req->async_priv = state;
 410
 411         state->smb_maxcnt = SVAL(req->vwv+5, 0);
 412         state->smb_mincnt = SVAL(req->vwv+6, 0);
 413
 414         reply_outbuf(req, 12, state->smb_maxcnt);
 415         data = (uint8_t *)smb_buf(req->outbuf);
 416
 417         /*
 418          * We have to tell the upper layers that we're async.
 419          */
 420         state->outbuf = req->outbuf;
 421         req->outbuf = NULL;
 422
 423         subreq = np_read_send(state, smbd_event_context(),
 424                               fsp->fake_file_handle, data,
 425                               state->smb_maxcnt);
 426         if (subreq == NULL) {
 427                 reply_nterror(req, NT_STATUS_NO_MEMORY);
 428                 return;
 429         }
 430         tevent_req_set_callback(subreq, pipe_read_andx_done,
 431                                 talloc_move(req->conn, &req));
 432 }
 433
 434 static void pipe_read_andx_done(struct tevent_req *subreq)
 435 {
 436         struct smb_request *req = tevent_req_callback_data(
 437                 subreq, struct smb_request);
 438         struct pipe_read_andx_state *state = talloc_get_type_abort(
 439                 req->async_priv, struct pipe_read_andx_state);
 440         NTSTATUS status;
 441         ssize_t nread;
 442         bool is_data_outstanding;
 443
 444         status = np_read_recv(subreq, &nread, &is_data_outstanding);
 445         TALLOC_FREE(subreq);
 446         if (!NT_STATUS_IS_OK(status)) {
 447                 reply_nterror(req, status);
 448                 goto done;
 449         }
 450
 451         req->outbuf = state->outbuf;
 452         state->outbuf = NULL;
 453
 454         srv_set_message((char *)req->outbuf, 12, nread, False);
 455
 456 #if 0
 457         /*
 458          * we should return STATUS_BUFFER_OVERFLOW if there's
 459          * out standing data.
 460          *
 461          * But we can't enable it yet, as it has bad interactions
 462          * with fixup_chain_error_packet() in chain_reply().
 463          */
 464         if (is_data_outstanding) {
 465                 error_packet_set((char *)req->outbuf, ERRDOS, ERRmoredata,
 466                                  STATUS_BUFFER_OVERFLOW, __LINE__, __FILE__);
 467         }
 468 #endif
 469
 470         SSVAL(req->outbuf,smb_vwv5,nread);
 471         SSVAL(req->outbuf,smb_vwv6,
 472               req_wct_ofs(req)
 473               + 1               /* the wct field */
 474               + 12 * sizeof(uint16_t) /* vwv */
 475               + 2);             /* the buflen field */
 476         SSVAL(req->outbuf,smb_vwv11,state->smb_maxcnt);
 477
 478         DEBUG(3,("readX-IPC min=%d max=%d nread=%d\n",
 479                  state->smb_mincnt, state->smb_maxcnt, (int)nread));
 480
 481  done:
 482         chain_reply(req);
 483         /*
 484          * We must free here as the ownership of req was
 485          * moved to the connection struct in reply_pipe_read_and_X().
 486          */
 487         TALLOC_FREE(req);
 488 }