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 #include "libcli/security/security.h"
  31
  32 #define PIPE            "\\PIPE\\"
  33 #define PIPELEN         strlen(PIPE)
  34
  35 #define MAX_PIPE_NAME_LEN       24
  36
  37 NTSTATUS open_np_file(struct smb_request *smb_req, const char *name,
  38                       struct files_struct **pfsp)
  39 {
  40         struct connection_struct *conn = smb_req->conn;
  41         struct files_struct *fsp;
  42         struct smb_filename *smb_fname = NULL;
  43         NTSTATUS status;
  44
  45         status = file_new(smb_req, conn, &fsp);
  46         if (!NT_STATUS_IS_OK(status)) {
  47                 DEBUG(0, ("file_new failed: %s\n", nt_errstr(status)));
  48                 return status;
  49         }
  50
  51         fsp->conn = conn;
  52         fsp->fh->fd = -1;
  53         fsp->vuid = smb_req->vuid;
  54         fsp->can_lock = false;
  55         fsp->access_mask = FILE_READ_DATA | FILE_WRITE_DATA;
  56
  57         status = create_synthetic_smb_fname(talloc_tos(), name, NULL, NULL,
  58                                             &smb_fname);
  59                 if (!NT_STATUS_IS_OK(status)) {
  60                 file_free(smb_req, fsp);
  61                 return status;
  62         }
  63         status = fsp_set_smb_fname(fsp, smb_fname);
  64         TALLOC_FREE(smb_fname);
  65         if (!NT_STATUS_IS_OK(status)) {
  66                 file_free(smb_req, fsp);
  67                 return status;
  68         }
  69
  70         status = np_open(fsp, name,
  71                          conn->sconn->local_address,
  72                          conn->sconn->remote_address,
  73                          &conn->sconn->client_id,
  74                          conn->session_info,
  75                          conn->sconn->msg_ctx,
  76                          &fsp->fake_file_handle);
  77         if (!NT_STATUS_IS_OK(status)) {
  78                 DEBUG(10, ("np_open(%s) returned %s\n", name,
  79                            nt_errstr(status)));
  80                 file_free(smb_req, fsp);
  81                 return status;
  82         }
  83
  84         *pfsp = fsp;
  85
  86         return NT_STATUS_OK;
  87 }
  88
  89 /****************************************************************************
  90  Reply to an open and X on a named pipe.
  91  This code is basically stolen from reply_open_and_X with some
  92  wrinkles to handle pipes.
  93 ****************************************************************************/
  94
  95 void reply_open_pipe_and_X(connection_struct *conn, struct smb_request *req)
  96 {
  97         const char *fname = NULL;
  98         char *pipe_name = NULL;
  99         files_struct *fsp;
 100         TALLOC_CTX *ctx = talloc_tos();
 101         NTSTATUS status;
 102
 103         /* XXXX we need to handle passed times, sattr and flags */
 104         srvstr_pull_req_talloc(ctx, req, &pipe_name, req->buf, STR_TERMINATE);
 105         if (!pipe_name) {
 106                 reply_botherror(req, NT_STATUS_OBJECT_NAME_NOT_FOUND,
 107                                 ERRDOS, ERRbadpipe);
 108                 return;
 109         }
 110
 111         /* If the name doesn't start \PIPE\ then this is directed */
 112         /* at a mailslot or something we really, really don't understand, */
 113         /* not just something we really don't understand. */
 114         if ( strncmp(pipe_name,PIPE,PIPELEN) != 0 ) {
 115                 reply_nterror(req, NT_STATUS_ACCESS_DENIED);
 116                 return;
 117         }
 118
 119         DEBUG(4,("Opening pipe %s.\n", pipe_name));
 120
 121         /* Strip \PIPE\ off the name. */
 122         fname = pipe_name + PIPELEN;
 123
 124 #if 0
 125         /*
 126          * Hack for NT printers... JRA.
 127          */
 128         if(should_fail_next_srvsvc_open(fname)) {
 129                 reply_nterror(req, NT_STATUS_ACCESS_DENIED);
 130                 return;
 131         }
 132 #endif
 133
 134         status = open_np_file(req, fname, &fsp);
 135         if (!NT_STATUS_IS_OK(status)) {
 136                 if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
 137                         reply_botherror(req, NT_STATUS_OBJECT_NAME_NOT_FOUND,
 138                                         ERRDOS, ERRbadpipe);
 139                         return;
 140                 }
 141                 reply_nterror(req, status);
 142                 return;
 143         }
 144
 145         /* Prepare the reply */
 146         reply_outbuf(req, 15, 0);
 147
 148         /* Mark the opened file as an existing named pipe in message mode. */
 149         SSVAL(req->outbuf,smb_vwv9,2);
 150         SSVAL(req->outbuf,smb_vwv10,0xc700);
 151
 152         SSVAL(req->outbuf, smb_vwv2, fsp->fnum);
 153         SSVAL(req->outbuf, smb_vwv3, 0);        /* fmode */
 154         srv_put_dos_date3((char *)req->outbuf, smb_vwv4, 0);    /* mtime */
 155         SIVAL(req->outbuf, smb_vwv6, 0);        /* size */
 156         SSVAL(req->outbuf, smb_vwv8, 0);        /* rmode */
 157         SSVAL(req->outbuf, smb_vwv11, 0x0001);
 158
 159         chain_reply(req);
 160         return;
 161 }
 162
 163 /****************************************************************************
 164  Reply to a write on a pipe.
 165 ****************************************************************************/
 166
 167 struct pipe_write_state {
 168         size_t numtowrite;
 169 };
 170
 171 static void pipe_write_done(struct tevent_req *subreq);
 172
 173 void reply_pipe_write(struct smb_request *req)
 174 {
 175         files_struct *fsp = file_fsp(req, SVAL(req->vwv+0, 0));
 176         const uint8_t *data;
 177         struct pipe_write_state *state;
 178         struct tevent_req *subreq;
 179
 180         if (!fsp_is_np(fsp)) {
 181                 reply_nterror(req, NT_STATUS_INVALID_HANDLE);
 182                 return;
 183         }
 184
 185         if (fsp->vuid != req->vuid) {
 186                 reply_nterror(req, NT_STATUS_INVALID_HANDLE);
 187                 return;
 188         }
 189
 190         state = talloc(req, struct pipe_write_state);
 191         if (state == NULL) {
 192                 reply_nterror(req, NT_STATUS_NO_MEMORY);
 193                 return;
 194         }
 195         req->async_priv = state;
 196
 197         state->numtowrite = SVAL(req->vwv+1, 0);
 198
 199         data = req->buf + 3;
 200
 201         DEBUG(6, ("reply_pipe_write: %x name: %s len: %d\n", (int)fsp->fnum,
 202                   fsp_str_dbg(fsp), (int)state->numtowrite));
 203
 204         subreq = np_write_send(state, smbd_event_context(),
 205                                fsp->fake_file_handle, data, state->numtowrite);
 206         if (subreq == NULL) {
 207                 TALLOC_FREE(state);
 208                 reply_nterror(req, NT_STATUS_NO_MEMORY);
 209                 return;
 210         }
 211         tevent_req_set_callback(subreq, pipe_write_done,
 212                                 talloc_move(req->conn, &req));
 213 }
 214
 215 static void pipe_write_done(struct tevent_req *subreq)
 216 {
 217         struct smb_request *req = tevent_req_callback_data(
 218                 subreq, struct smb_request);
 219         struct pipe_write_state *state = talloc_get_type_abort(
 220                 req->async_priv, struct pipe_write_state);
 221         NTSTATUS status;
 222         ssize_t nwritten = -1;
 223
 224         status = np_write_recv(subreq, &nwritten);
 225         TALLOC_FREE(subreq);
 226         if (nwritten < 0) {
 227                 reply_nterror(req, status);
 228                 goto send;
 229         }
 230
 231         /* Looks bogus to me now. Needs to be removed ? JRA. */
 232         if ((nwritten == 0 && state->numtowrite != 0)) {
 233                 reply_nterror(req, NT_STATUS_ACCESS_DENIED);
 234                 goto send;
 235         }
 236
 237         reply_outbuf(req, 1, 0);
 238
 239         SSVAL(req->outbuf,smb_vwv0,nwritten);
 240
 241         DEBUG(3,("write-IPC nwritten=%d\n", (int)nwritten));
 242
 243  send:
 244         if (!srv_send_smb(req->sconn, (char *)req->outbuf,
 245                           true, req->seqnum+1,
 246                           IS_CONN_ENCRYPTED(req->conn)||req->encrypted,
 247                           &req->pcd)) {
 248                 exit_server_cleanly("construct_reply: srv_send_smb failed.");
 249         }
 250         TALLOC_FREE(req);
 251 }
 252
 253 /****************************************************************************
 254  Reply to a write and X.
 255
 256  This code is basically stolen from reply_write_and_X with some
 257  wrinkles to handle pipes.
 258 ****************************************************************************/
 259
 260 struct pipe_write_andx_state {
 261         bool pipe_start_message_raw;
 262         size_t numtowrite;
 263 };
 264
 265 static void pipe_write_andx_done(struct tevent_req *subreq);
 266
 267 void reply_pipe_write_and_X(struct smb_request *req)
 268 {
 269         files_struct *fsp = file_fsp(req, SVAL(req->vwv+2, 0));
 270         int smb_doff = SVAL(req->vwv+11, 0);
 271         uint8_t *data;
 272         struct pipe_write_andx_state *state;
 273         struct tevent_req *subreq;
 274
 275         if (!fsp_is_np(fsp)) {
 276                 reply_nterror(req, NT_STATUS_INVALID_HANDLE);
 277                 return;
 278         }
 279
 280         if (fsp->vuid != req->vuid) {
 281                 reply_nterror(req, NT_STATUS_INVALID_HANDLE);
 282                 return;
 283         }
 284
 285         state = talloc(req, struct pipe_write_andx_state);
 286         if (state == NULL) {
 287                 reply_nterror(req, NT_STATUS_NO_MEMORY);
 288                 return;
 289         }
 290         req->async_priv = state;
 291
 292         state->numtowrite = SVAL(req->vwv+10, 0);
 293         state->pipe_start_message_raw =
 294                 ((SVAL(req->vwv+7, 0) & (PIPE_START_MESSAGE|PIPE_RAW_MODE))
 295                  == (PIPE_START_MESSAGE|PIPE_RAW_MODE));
 296
 297         DEBUG(6, ("reply_pipe_write_and_X: %x name: %s len: %d\n",
 298                   (int)fsp->fnum, fsp_str_dbg(fsp), (int)state->numtowrite));
 299
 300         data = (uint8_t *)smb_base(req->inbuf) + smb_doff;
 301
 302         if (state->pipe_start_message_raw) {
 303                 /*
 304                  * For the start of a message in named pipe byte mode,
 305                  * the first two bytes are a length-of-pdu field. Ignore
 306                  * them (we don't trust the client). JRA.
 307                  */
 308                 if (state->numtowrite < 2) {
 309                         DEBUG(0,("reply_pipe_write_and_X: start of message "
 310                                  "set and not enough data sent.(%u)\n",
 311                                  (unsigned int)state->numtowrite ));
 312                         reply_nterror(req, NT_STATUS_INVALID_PARAMETER);
 313                         return;
 314                 }
 315
 316                 data += 2;
 317                 state->numtowrite -= 2;
 318         }
 319
 320         subreq = np_write_send(state, smbd_event_context(),
 321                                fsp->fake_file_handle, data, state->numtowrite);
 322         if (subreq == NULL) {
 323                 TALLOC_FREE(state);
 324                 reply_nterror(req, NT_STATUS_NO_MEMORY);
 325                 return;
 326         }
 327         tevent_req_set_callback(subreq, pipe_write_andx_done,
 328                                 talloc_move(req->conn, &req));
 329 }
 330
 331 static void pipe_write_andx_done(struct tevent_req *subreq)
 332 {
 333         struct smb_request *req = tevent_req_callback_data(
 334                 subreq, struct smb_request);
 335         struct pipe_write_andx_state *state = talloc_get_type_abort(
 336                 req->async_priv, struct pipe_write_andx_state);
 337         NTSTATUS status;
 338         ssize_t nwritten = -1;
 339
 340         status = np_write_recv(subreq, &nwritten);
 341         TALLOC_FREE(subreq);
 342
 343         if (!NT_STATUS_IS_OK(status)) {
 344                 reply_nterror(req, status);
 345                 goto done;
 346         }
 347
 348         /* Looks bogus to me now. Is this error message correct ? JRA. */
 349         if (nwritten != state->numtowrite) {
 350                 reply_nterror(req, NT_STATUS_ACCESS_DENIED);
 351                 goto done;
 352         }
 353
 354         reply_outbuf(req, 6, 0);
 355
 356         nwritten = (state->pipe_start_message_raw ? nwritten + 2 : nwritten);
 357         SSVAL(req->outbuf,smb_vwv2,nwritten);
 358
 359         DEBUG(3,("writeX-IPC nwritten=%d\n", (int)nwritten));
 360
 361  done:
 362         chain_reply(req);
 363         /*
 364          * We must free here as the ownership of req was
 365          * moved to the connection struct in reply_pipe_write_and_X().
 366          */
 367         TALLOC_FREE(req);
 368 }
 369
 370 /****************************************************************************
 371  Reply to a read and X.
 372  This code is basically stolen from reply_read_and_X with some
 373  wrinkles to handle pipes.
 374 ****************************************************************************/
 375
 376 struct pipe_read_andx_state {
 377         uint8_t *outbuf;
 378         int smb_mincnt;
 379         int smb_maxcnt;
 380 };
 381
 382 static void pipe_read_andx_done(struct tevent_req *subreq);
 383
 384 void reply_pipe_read_and_X(struct smb_request *req)
 385 {
 386         files_struct *fsp = file_fsp(req, SVAL(req->vwv+0, 0));
 387         uint8_t *data;
 388         struct pipe_read_andx_state *state;
 389         struct tevent_req *subreq;
 390
 391         /* we don't use the offset given to use for pipe reads. This
 392            is deliberate, instead we always return the next lump of
 393            data on the pipe */
 394 #if 0
 395         uint32 smb_offs = IVAL(req->vwv+3, 0);
 396 #endif
 397
 398         if (!fsp_is_np(fsp)) {
 399                 reply_nterror(req, NT_STATUS_INVALID_HANDLE);
 400                 return;
 401         }
 402
 403         if (fsp->vuid != req->vuid) {
 404                 reply_nterror(req, NT_STATUS_INVALID_HANDLE);
 405                 return;
 406         }
 407
 408         state = talloc(req, struct pipe_read_andx_state);
 409         if (state == NULL) {
 410                 reply_nterror(req, NT_STATUS_NO_MEMORY);
 411                 return;
 412         }
 413         req->async_priv = state;
 414
 415         state->smb_maxcnt = SVAL(req->vwv+5, 0);
 416         state->smb_mincnt = SVAL(req->vwv+6, 0);
 417
 418         reply_outbuf(req, 12, state->smb_maxcnt);
 419         data = (uint8_t *)smb_buf(req->outbuf);
 420
 421         /*
 422          * We have to tell the upper layers that we're async.
 423          */
 424         state->outbuf = req->outbuf;
 425         req->outbuf = NULL;
 426
 427         subreq = np_read_send(state, smbd_event_context(),
 428                               fsp->fake_file_handle, data,
 429                               state->smb_maxcnt);
 430         if (subreq == NULL) {
 431                 reply_nterror(req, NT_STATUS_NO_MEMORY);
 432                 return;
 433         }
 434         tevent_req_set_callback(subreq, pipe_read_andx_done,
 435                                 talloc_move(req->conn, &req));
 436 }
 437
 438 static void pipe_read_andx_done(struct tevent_req *subreq)
 439 {
 440         struct smb_request *req = tevent_req_callback_data(
 441                 subreq, struct smb_request);
 442         struct pipe_read_andx_state *state = talloc_get_type_abort(
 443                 req->async_priv, struct pipe_read_andx_state);
 444         NTSTATUS status;
 445         ssize_t nread;
 446         bool is_data_outstanding;
 447
 448         status = np_read_recv(subreq, &nread, &is_data_outstanding);
 449         TALLOC_FREE(subreq);
 450         if (!NT_STATUS_IS_OK(status)) {
 451                 reply_nterror(req, status);
 452                 goto done;
 453         }
 454
 455         req->outbuf = state->outbuf;
 456         state->outbuf = NULL;
 457
 458         srv_set_message((char *)req->outbuf, 12, nread, False);
 459
 460 #if 0
 461         /*
 462          * we should return STATUS_BUFFER_OVERFLOW if there's
 463          * out standing data.
 464          *
 465          * But we can't enable it yet, as it has bad interactions
 466          * with fixup_chain_error_packet() in chain_reply().
 467          */
 468         if (is_data_outstanding) {
 469                 error_packet_set((char *)req->outbuf, ERRDOS, ERRmoredata,
 470                                  STATUS_BUFFER_OVERFLOW, __LINE__, __FILE__);
 471         }
 472 #endif
 473
 474         SSVAL(req->outbuf,smb_vwv5,nread);
 475         SSVAL(req->outbuf,smb_vwv6,
 476               req_wct_ofs(req)
 477               + 1               /* the wct field */
 478               + 12 * sizeof(uint16_t) /* vwv */
 479               + 2);             /* the buflen field */
 480         SSVAL(req->outbuf,smb_vwv11,state->smb_maxcnt);
 481
 482         DEBUG(3,("readX-IPC min=%d max=%d nread=%d\n",
 483                  state->smb_mincnt, state->smb_maxcnt, (int)nread));
 484
 485  done:
 486         chain_reply(req);
 487         /*
 488          * We must free here as the ownership of req was
 489          * moved to the connection struct in reply_pipe_read_and_X().
 490          */
 491         TALLOC_FREE(req);
 492 }