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,
  73                          conn->sconn->msg_ctx,
  74                          &fsp->fake_file_handle);
  75         if (!NT_STATUS_IS_OK(status)) {
  76                 DEBUG(10, ("np_open(%s) returned %s\n", name,
  77                            nt_errstr(status)));
  78                 file_free(smb_req, fsp);
  79                 return status;
  80         }
  81
  82         *pfsp = fsp;
  83
  84         return NT_STATUS_OK;
  85 }
  86
  87 /****************************************************************************
  88  Reply to an open and X on a named pipe.
  89  This code is basically stolen from reply_open_and_X with some
  90  wrinkles to handle pipes.
  91 ****************************************************************************/
  92
  93 void reply_open_pipe_and_X(connection_struct *conn, struct smb_request *req)
  94 {
  95         const char *fname = NULL;
  96         char *pipe_name = NULL;
  97         files_struct *fsp;
  98         TALLOC_CTX *ctx = talloc_tos();
  99         NTSTATUS status;
 100
 101         /* XXXX we need to handle passed times, sattr and flags */
 102         srvstr_pull_req_talloc(ctx, req, &pipe_name, req->buf, STR_TERMINATE);
 103         if (!pipe_name) {
 104                 reply_botherror(req, NT_STATUS_OBJECT_NAME_NOT_FOUND,
 105                                 ERRDOS, ERRbadpipe);
 106                 return;
 107         }
 108
 109         /* If the name doesn't start \PIPE\ then this is directed */
 110         /* at a mailslot or something we really, really don't understand, */
 111         /* not just something we really don't understand. */
 112         if ( strncmp(pipe_name,PIPE,PIPELEN) != 0 ) {
 113                 reply_nterror(req, NT_STATUS_ACCESS_DENIED);
 114                 return;
 115         }
 116
 117         DEBUG(4,("Opening pipe %s.\n", pipe_name));
 118
 119         /* Strip \PIPE\ off the name. */
 120         fname = pipe_name + PIPELEN;
 121
 122 #if 0
 123         /*
 124          * Hack for NT printers... JRA.
 125          */
 126         if(should_fail_next_srvsvc_open(fname)) {
 127                 reply_nterror(req, NT_STATUS_ACCESS_DENIED);
 128                 return;
 129         }
 130 #endif
 131
 132         status = open_np_file(req, fname, &fsp);
 133         if (!NT_STATUS_IS_OK(status)) {
 134                 if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
 135                         reply_botherror(req, NT_STATUS_OBJECT_NAME_NOT_FOUND,
 136                                         ERRDOS, ERRbadpipe);
 137                         return;
 138                 }
 139                 reply_nterror(req, status);
 140                 return;
 141         }
 142
 143         /* Prepare the reply */
 144         reply_outbuf(req, 15, 0);
 145
 146         /* Mark the opened file as an existing named pipe in message mode. */
 147         SSVAL(req->outbuf,smb_vwv9,2);
 148         SSVAL(req->outbuf,smb_vwv10,0xc700);
 149
 150         SSVAL(req->outbuf, smb_vwv2, fsp->fnum);
 151         SSVAL(req->outbuf, smb_vwv3, 0);        /* fmode */
 152         srv_put_dos_date3((char *)req->outbuf, smb_vwv4, 0);    /* mtime */
 153         SIVAL(req->outbuf, smb_vwv6, 0);        /* size */
 154         SSVAL(req->outbuf, smb_vwv8, 0);        /* rmode */
 155         SSVAL(req->outbuf, smb_vwv11, 0x0001);
 156
 157         chain_reply(req);
 158         return;
 159 }
 160
 161 /****************************************************************************
 162  Reply to a write on a pipe.
 163 ****************************************************************************/
 164
 165 struct pipe_write_state {
 166         size_t numtowrite;
 167 };
 168
 169 static void pipe_write_done(struct tevent_req *subreq);
 170
 171 void reply_pipe_write(struct smb_request *req)
 172 {
 173         files_struct *fsp = file_fsp(req, SVAL(req->vwv+0, 0));
 174         const uint8_t *data;
 175         struct pipe_write_state *state;
 176         struct tevent_req *subreq;
 177
 178         if (!fsp_is_np(fsp)) {
 179                 reply_nterror(req, NT_STATUS_INVALID_HANDLE);
 180                 return;
 181         }
 182
 183         if (fsp->vuid != req->vuid) {
 184                 reply_nterror(req, NT_STATUS_INVALID_HANDLE);
 185                 return;
 186         }
 187
 188         state = talloc(req, struct pipe_write_state);
 189         if (state == NULL) {
 190                 reply_nterror(req, NT_STATUS_NO_MEMORY);
 191                 return;
 192         }
 193         req->async_priv = state;
 194
 195         state->numtowrite = SVAL(req->vwv+1, 0);
 196
 197         data = req->buf + 3;
 198
 199         DEBUG(6, ("reply_pipe_write: %x name: %s len: %d\n", (int)fsp->fnum,
 200                   fsp_str_dbg(fsp), (int)state->numtowrite));
 201
 202         subreq = np_write_send(state, smbd_event_context(),
 203                                fsp->fake_file_handle, data, state->numtowrite);
 204         if (subreq == NULL) {
 205                 TALLOC_FREE(state);
 206                 reply_nterror(req, NT_STATUS_NO_MEMORY);
 207                 return;
 208         }
 209         tevent_req_set_callback(subreq, pipe_write_done,
 210                                 talloc_move(req->conn, &req));
 211 }
 212
 213 static void pipe_write_done(struct tevent_req *subreq)
 214 {
 215         struct smb_request *req = tevent_req_callback_data(
 216                 subreq, struct smb_request);
 217         struct pipe_write_state *state = talloc_get_type_abort(
 218                 req->async_priv, struct pipe_write_state);
 219         NTSTATUS status;
 220         ssize_t nwritten = -1;
 221
 222         status = np_write_recv(subreq, &nwritten);
 223         TALLOC_FREE(subreq);
 224         if (nwritten < 0) {
 225                 reply_nterror(req, status);
 226                 goto send;
 227         }
 228
 229         /* Looks bogus to me now. Needs to be removed ? JRA. */
 230         if ((nwritten == 0 && state->numtowrite != 0)) {
 231                 reply_nterror(req, NT_STATUS_ACCESS_DENIED);
 232                 goto send;
 233         }
 234
 235         reply_outbuf(req, 1, 0);
 236
 237         SSVAL(req->outbuf,smb_vwv0,nwritten);
 238
 239         DEBUG(3,("write-IPC nwritten=%d\n", (int)nwritten));
 240
 241  send:
 242         if (!srv_send_smb(smbd_server_fd(), (char *)req->outbuf,
 243                           true, req->seqnum+1,
 244                           IS_CONN_ENCRYPTED(req->conn)||req->encrypted,
 245                           &req->pcd)) {
 246                 exit_server_cleanly("construct_reply: srv_send_smb failed.");
 247         }
 248         TALLOC_FREE(req);
 249 }
 250
 251 /****************************************************************************
 252  Reply to a write and X.
 253
 254  This code is basically stolen from reply_write_and_X with some
 255  wrinkles to handle pipes.
 256 ****************************************************************************/
 257
 258 struct pipe_write_andx_state {
 259         bool pipe_start_message_raw;
 260         size_t numtowrite;
 261 };
 262
 263 static void pipe_write_andx_done(struct tevent_req *subreq);
 264
 265 void reply_pipe_write_and_X(struct smb_request *req)
 266 {
 267         files_struct *fsp = file_fsp(req, SVAL(req->vwv+2, 0));
 268         int smb_doff = SVAL(req->vwv+11, 0);
 269         uint8_t *data;
 270         struct pipe_write_andx_state *state;
 271         struct tevent_req *subreq;
 272
 273         if (!fsp_is_np(fsp)) {
 274                 reply_nterror(req, NT_STATUS_INVALID_HANDLE);
 275                 return;
 276         }
 277
 278         if (fsp->vuid != req->vuid) {
 279                 reply_nterror(req, NT_STATUS_INVALID_HANDLE);
 280                 return;
 281         }
 282
 283         state = talloc(req, struct pipe_write_andx_state);
 284         if (state == NULL) {
 285                 reply_nterror(req, NT_STATUS_NO_MEMORY);
 286                 return;
 287         }
 288         req->async_priv = state;
 289
 290         state->numtowrite = SVAL(req->vwv+10, 0);
 291         state->pipe_start_message_raw =
 292                 ((SVAL(req->vwv+7, 0) & (PIPE_START_MESSAGE|PIPE_RAW_MODE))
 293                  == (PIPE_START_MESSAGE|PIPE_RAW_MODE));
 294
 295         DEBUG(6, ("reply_pipe_write_and_X: %x name: %s len: %d\n",
 296                   (int)fsp->fnum, fsp_str_dbg(fsp), (int)state->numtowrite));
 297
 298         data = (uint8_t *)smb_base(req->inbuf) + smb_doff;
 299
 300         if (state->pipe_start_message_raw) {
 301                 /*
 302                  * For the start of a message in named pipe byte mode,
 303                  * the first two bytes are a length-of-pdu field. Ignore
 304                  * them (we don't trust the client). JRA.
 305                  */
 306                 if (state->numtowrite < 2) {
 307                         DEBUG(0,("reply_pipe_write_and_X: start of message "
 308                                  "set and not enough data sent.(%u)\n",
 309                                  (unsigned int)state->numtowrite ));
 310                         reply_nterror(req, NT_STATUS_INVALID_PARAMETER);
 311                         return;
 312                 }
 313
 314                 data += 2;
 315                 state->numtowrite -= 2;
 316         }
 317
 318         subreq = np_write_send(state, smbd_event_context(),
 319                                fsp->fake_file_handle, data, state->numtowrite);
 320         if (subreq == NULL) {
 321                 TALLOC_FREE(state);
 322                 reply_nterror(req, NT_STATUS_NO_MEMORY);
 323                 return;
 324         }
 325         tevent_req_set_callback(subreq, pipe_write_andx_done,
 326                                 talloc_move(req->conn, &req));
 327 }
 328
 329 static void pipe_write_andx_done(struct tevent_req *subreq)
 330 {
 331         struct smb_request *req = tevent_req_callback_data(
 332                 subreq, struct smb_request);
 333         struct pipe_write_andx_state *state = talloc_get_type_abort(
 334                 req->async_priv, struct pipe_write_andx_state);
 335         NTSTATUS status;
 336         ssize_t nwritten = -1;
 337
 338         status = np_write_recv(subreq, &nwritten);
 339         TALLOC_FREE(subreq);
 340
 341         if (!NT_STATUS_IS_OK(status)) {
 342                 reply_nterror(req, status);
 343                 goto done;
 344         }
 345
 346         /* Looks bogus to me now. Is this error message correct ? JRA. */
 347         if (nwritten != state->numtowrite) {
 348                 reply_nterror(req, NT_STATUS_ACCESS_DENIED);
 349                 goto done;
 350         }
 351
 352         reply_outbuf(req, 6, 0);
 353
 354         nwritten = (state->pipe_start_message_raw ? nwritten + 2 : nwritten);
 355         SSVAL(req->outbuf,smb_vwv2,nwritten);
 356
 357         DEBUG(3,("writeX-IPC nwritten=%d\n", (int)nwritten));
 358
 359  done:
 360         chain_reply(req);
 361         /*
 362          * We must free here as the ownership of req was
 363          * moved to the connection struct in reply_pipe_write_and_X().
 364          */
 365         TALLOC_FREE(req);
 366 }
 367
 368 /****************************************************************************
 369  Reply to a read and X.
 370  This code is basically stolen from reply_read_and_X with some
 371  wrinkles to handle pipes.
 372 ****************************************************************************/
 373
 374 struct pipe_read_andx_state {
 375         uint8_t *outbuf;
 376         int smb_mincnt;
 377         int smb_maxcnt;
 378 };
 379
 380 static void pipe_read_andx_done(struct tevent_req *subreq);
 381
 382 void reply_pipe_read_and_X(struct smb_request *req)
 383 {
 384         files_struct *fsp = file_fsp(req, SVAL(req->vwv+0, 0));
 385         uint8_t *data;
 386         struct pipe_read_andx_state *state;
 387         struct tevent_req *subreq;
 388
 389         /* we don't use the offset given to use for pipe reads. This
 390            is deliberate, instead we always return the next lump of
 391            data on the pipe */
 392 #if 0
 393         uint32 smb_offs = IVAL(req->vwv+3, 0);
 394 #endif
 395
 396         if (!fsp_is_np(fsp)) {
 397                 reply_nterror(req, NT_STATUS_INVALID_HANDLE);
 398                 return;
 399         }
 400
 401         if (fsp->vuid != req->vuid) {
 402                 reply_nterror(req, NT_STATUS_INVALID_HANDLE);
 403                 return;
 404         }
 405
 406         state = talloc(req, struct pipe_read_andx_state);
 407         if (state == NULL) {
 408                 reply_nterror(req, NT_STATUS_NO_MEMORY);
 409                 return;
 410         }
 411         req->async_priv = state;
 412
 413         state->smb_maxcnt = SVAL(req->vwv+5, 0);
 414         state->smb_mincnt = SVAL(req->vwv+6, 0);
 415
 416         reply_outbuf(req, 12, state->smb_maxcnt);
 417         data = (uint8_t *)smb_buf(req->outbuf);
 418
 419         /*
 420          * We have to tell the upper layers that we're async.
 421          */
 422         state->outbuf = req->outbuf;
 423         req->outbuf = NULL;
 424
 425         subreq = np_read_send(state, smbd_event_context(),
 426                               fsp->fake_file_handle, data,
 427                               state->smb_maxcnt);
 428         if (subreq == NULL) {
 429                 reply_nterror(req, NT_STATUS_NO_MEMORY);
 430                 return;
 431         }
 432         tevent_req_set_callback(subreq, pipe_read_andx_done,
 433                                 talloc_move(req->conn, &req));
 434 }
 435
 436 static void pipe_read_andx_done(struct tevent_req *subreq)
 437 {
 438         struct smb_request *req = tevent_req_callback_data(
 439                 subreq, struct smb_request);
 440         struct pipe_read_andx_state *state = talloc_get_type_abort(
 441                 req->async_priv, struct pipe_read_andx_state);
 442         NTSTATUS status;
 443         ssize_t nread;
 444         bool is_data_outstanding;
 445
 446         status = np_read_recv(subreq, &nread, &is_data_outstanding);
 447         TALLOC_FREE(subreq);
 448         if (!NT_STATUS_IS_OK(status)) {
 449                 reply_nterror(req, status);
 450                 goto done;
 451         }
 452
 453         req->outbuf = state->outbuf;
 454         state->outbuf = NULL;
 455
 456         srv_set_message((char *)req->outbuf, 12, nread, False);
 457
 458 #if 0
 459         /*
 460          * we should return STATUS_BUFFER_OVERFLOW if there's
 461          * out standing data.
 462          *
 463          * But we can't enable it yet, as it has bad interactions
 464          * with fixup_chain_error_packet() in chain_reply().
 465          */
 466         if (is_data_outstanding) {
 467                 error_packet_set((char *)req->outbuf, ERRDOS, ERRmoredata,
 468                                  STATUS_BUFFER_OVERFLOW, __LINE__, __FILE__);
 469         }
 470 #endif
 471
 472         SSVAL(req->outbuf,smb_vwv5,nread);
 473         SSVAL(req->outbuf,smb_vwv6,
 474               req_wct_ofs(req)
 475               + 1               /* the wct field */
 476               + 12 * sizeof(uint16_t) /* vwv */
 477               + 2);             /* the buflen field */
 478         SSVAL(req->outbuf,smb_vwv11,state->smb_maxcnt);
 479
 480         DEBUG(3,("readX-IPC min=%d max=%d nread=%d\n",
 481                  state->smb_mincnt, state->smb_maxcnt, (int)nread));
 482
 483  done:
 484         chain_reply(req);
 485         /*
 486          * We must free here as the ownership of req was
 487          * moved to the connection struct in reply_pipe_read_and_X().
 488          */
 489         TALLOC_FREE(req);
 490 }