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/smbd.h"
  30 #include "smbd/globals.h"
  31 #include "libcli/security/security.h"
  32
  33 #define PIPE            "\\PIPE\\"
  34 #define PIPELEN         strlen(PIPE)
  35
  36 #define MAX_PIPE_NAME_LEN       24
  37
  38 NTSTATUS open_np_file(struct smb_request *smb_req, const char *name,
  39                       struct files_struct **pfsp)
  40 {
  41         struct connection_struct *conn = smb_req->conn;
  42         struct files_struct *fsp;
  43         struct smb_filename *smb_fname = NULL;
  44         NTSTATUS status;
  45
  46         status = file_new(smb_req, conn, &fsp);
  47         if (!NT_STATUS_IS_OK(status)) {
  48                 DEBUG(0, ("file_new failed: %s\n", nt_errstr(status)));
  49                 return status;
  50         }
  51
  52         fsp->conn = conn;
  53         fsp->fh->fd = -1;
  54         fsp->vuid = smb_req->vuid;
  55         fsp->can_lock = false;
  56         fsp->access_mask = FILE_READ_DATA | FILE_WRITE_DATA;
  57
  58         status = create_synthetic_smb_fname(talloc_tos(), name, NULL, NULL,
  59                                             &smb_fname);
  60                 if (!NT_STATUS_IS_OK(status)) {
  61                 file_free(smb_req, fsp);
  62                 return status;
  63         }
  64         status = fsp_set_smb_fname(fsp, smb_fname);
  65         TALLOC_FREE(smb_fname);
  66         if (!NT_STATUS_IS_OK(status)) {
  67                 file_free(smb_req, fsp);
  68                 return status;
  69         }
  70
  71         status = np_open(fsp, name,
  72                          conn->sconn->local_address,
  73                          conn->sconn->remote_address,
  74                          &conn->sconn->client_id,
  75                          conn->session_info,
  76                          conn->sconn->msg_ctx,
  77                          &fsp->fake_file_handle);
  78         if (!NT_STATUS_IS_OK(status)) {
  79                 DEBUG(10, ("np_open(%s) returned %s\n", name,
  80                            nt_errstr(status)));
  81                 file_free(smb_req, fsp);
  82                 return status;
  83         }
  84
  85         *pfsp = fsp;
  86
  87         return NT_STATUS_OK;
  88 }
  89
  90 /****************************************************************************
  91  Reply to an open and X on a named pipe.
  92  This code is basically stolen from reply_open_and_X with some
  93  wrinkles to handle pipes.
  94 ****************************************************************************/
  95
  96 void reply_open_pipe_and_X(connection_struct *conn, struct smb_request *req)
  97 {
  98         const char *fname = NULL;
  99         char *pipe_name = NULL;
 100         files_struct *fsp;
 101         TALLOC_CTX *ctx = talloc_tos();
 102         NTSTATUS status;
 103
 104         /* XXXX we need to handle passed times, sattr and flags */
 105         srvstr_pull_req_talloc(ctx, req, &pipe_name, req->buf, STR_TERMINATE);
 106         if (!pipe_name) {
 107                 reply_botherror(req, NT_STATUS_OBJECT_NAME_NOT_FOUND,
 108                                 ERRDOS, ERRbadpipe);
 109                 return;
 110         }
 111
 112         /* If the name doesn't start \PIPE\ then this is directed */
 113         /* at a mailslot or something we really, really don't understand, */
 114         /* not just something we really don't understand. */
 115         if ( strncmp(pipe_name,PIPE,PIPELEN) != 0 ) {
 116                 reply_nterror(req, NT_STATUS_ACCESS_DENIED);
 117                 return;
 118         }
 119
 120         DEBUG(4,("Opening pipe %s.\n", pipe_name));
 121
 122         /* Strip \PIPE\ off the name. */
 123         fname = pipe_name + PIPELEN;
 124
 125 #if 0
 126         /*
 127          * Hack for NT printers... JRA.
 128          */
 129         if(should_fail_next_srvsvc_open(fname)) {
 130                 reply_nterror(req, NT_STATUS_ACCESS_DENIED);
 131                 return;
 132         }
 133 #endif
 134
 135         status = open_np_file(req, fname, &fsp);
 136         if (!NT_STATUS_IS_OK(status)) {
 137                 if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
 138                         reply_botherror(req, NT_STATUS_OBJECT_NAME_NOT_FOUND,
 139                                         ERRDOS, ERRbadpipe);
 140                         return;
 141                 }
 142                 reply_nterror(req, status);
 143                 return;
 144         }
 145
 146         /* Prepare the reply */
 147         reply_outbuf(req, 15, 0);
 148
 149         /* Mark the opened file as an existing named pipe in message mode. */
 150         SSVAL(req->outbuf,smb_vwv9,2);
 151         SSVAL(req->outbuf,smb_vwv10,0xc700);
 152
 153         SSVAL(req->outbuf, smb_vwv2, fsp->fnum);
 154         SSVAL(req->outbuf, smb_vwv3, 0);        /* fmode */
 155         srv_put_dos_date3((char *)req->outbuf, smb_vwv4, 0);    /* mtime */
 156         SIVAL(req->outbuf, smb_vwv6, 0);        /* size */
 157         SSVAL(req->outbuf, smb_vwv8, 0);        /* rmode */
 158         SSVAL(req->outbuf, smb_vwv11, 0x0001);
 159
 160         chain_reply(req);
 161         return;
 162 }
 163
 164 /****************************************************************************
 165  Reply to a write on a pipe.
 166 ****************************************************************************/
 167
 168 struct pipe_write_state {
 169         size_t numtowrite;
 170 };
 171
 172 static void pipe_write_done(struct tevent_req *subreq);
 173
 174 void reply_pipe_write(struct smb_request *req)
 175 {
 176         files_struct *fsp = file_fsp(req, SVAL(req->vwv+0, 0));
 177         const uint8_t *data;
 178         struct pipe_write_state *state;
 179         struct tevent_req *subreq;
 180
 181         if (!fsp_is_np(fsp)) {
 182                 reply_nterror(req, NT_STATUS_INVALID_HANDLE);
 183                 return;
 184         }
 185
 186         if (fsp->vuid != req->vuid) {
 187                 reply_nterror(req, NT_STATUS_INVALID_HANDLE);
 188                 return;
 189         }
 190
 191         state = talloc(req, struct pipe_write_state);
 192         if (state == NULL) {
 193                 reply_nterror(req, NT_STATUS_NO_MEMORY);
 194                 return;
 195         }
 196         req->async_priv = state;
 197
 198         state->numtowrite = SVAL(req->vwv+1, 0);
 199
 200         data = req->buf + 3;
 201
 202         DEBUG(6, ("reply_pipe_write: %x name: %s len: %d\n", (int)fsp->fnum,
 203                   fsp_str_dbg(fsp), (int)state->numtowrite));
 204
 205         subreq = np_write_send(state, smbd_event_context(),
 206                                fsp->fake_file_handle, data, state->numtowrite);
 207         if (subreq == NULL) {
 208                 TALLOC_FREE(state);
 209                 reply_nterror(req, NT_STATUS_NO_MEMORY);
 210                 return;
 211         }
 212         tevent_req_set_callback(subreq, pipe_write_done,
 213                                 talloc_move(req->conn, &req));
 214 }
 215
 216 static void pipe_write_done(struct tevent_req *subreq)
 217 {
 218         struct smb_request *req = tevent_req_callback_data(
 219                 subreq, struct smb_request);
 220         struct pipe_write_state *state = talloc_get_type_abort(
 221                 req->async_priv, struct pipe_write_state);
 222         NTSTATUS status;
 223         ssize_t nwritten = -1;
 224
 225         status = np_write_recv(subreq, &nwritten);
 226         TALLOC_FREE(subreq);
 227         if (nwritten < 0) {
 228                 reply_nterror(req, status);
 229                 goto send;
 230         }
 231
 232         /* Looks bogus to me now. Needs to be removed ? JRA. */
 233         if ((nwritten == 0 && state->numtowrite != 0)) {
 234                 reply_nterror(req, NT_STATUS_ACCESS_DENIED);
 235                 goto send;
 236         }
 237
 238         reply_outbuf(req, 1, 0);
 239
 240         SSVAL(req->outbuf,smb_vwv0,nwritten);
 241
 242         DEBUG(3,("write-IPC nwritten=%d\n", (int)nwritten));
 243
 244  send:
 245         if (!srv_send_smb(req->sconn, (char *)req->outbuf,
 246                           true, req->seqnum+1,
 247                           IS_CONN_ENCRYPTED(req->conn)||req->encrypted,
 248                           &req->pcd)) {
 249                 exit_server_cleanly("construct_reply: srv_send_smb failed.");
 250         }
 251         TALLOC_FREE(req);
 252 }
 253
 254 /****************************************************************************
 255  Reply to a write and X.
 256
 257  This code is basically stolen from reply_write_and_X with some
 258  wrinkles to handle pipes.
 259 ****************************************************************************/
 260
 261 struct pipe_write_andx_state {
 262         bool pipe_start_message_raw;
 263         size_t numtowrite;
 264 };
 265
 266 static void pipe_write_andx_done(struct tevent_req *subreq);
 267
 268 void reply_pipe_write_and_X(struct smb_request *req)
 269 {
 270         files_struct *fsp = file_fsp(req, SVAL(req->vwv+2, 0));
 271         int smb_doff = SVAL(req->vwv+11, 0);
 272         uint8_t *data;
 273         struct pipe_write_andx_state *state;
 274         struct tevent_req *subreq;
 275
 276         if (!fsp_is_np(fsp)) {
 277                 reply_nterror(req, NT_STATUS_INVALID_HANDLE);
 278                 return;
 279         }
 280
 281         if (fsp->vuid != req->vuid) {
 282                 reply_nterror(req, NT_STATUS_INVALID_HANDLE);
 283                 return;
 284         }
 285
 286         state = talloc(req, struct pipe_write_andx_state);
 287         if (state == NULL) {
 288                 reply_nterror(req, NT_STATUS_NO_MEMORY);
 289                 return;
 290         }
 291         req->async_priv = state;
 292
 293         state->numtowrite = SVAL(req->vwv+10, 0);
 294         state->pipe_start_message_raw =
 295                 ((SVAL(req->vwv+7, 0) & (PIPE_START_MESSAGE|PIPE_RAW_MODE))
 296                  == (PIPE_START_MESSAGE|PIPE_RAW_MODE));
 297
 298         DEBUG(6, ("reply_pipe_write_and_X: %x name: %s len: %d\n",
 299                   (int)fsp->fnum, fsp_str_dbg(fsp), (int)state->numtowrite));
 300
 301         data = (uint8_t *)smb_base(req->inbuf) + smb_doff;
 302
 303         if (state->pipe_start_message_raw) {
 304                 /*
 305                  * For the start of a message in named pipe byte mode,
 306                  * the first two bytes are a length-of-pdu field. Ignore
 307                  * them (we don't trust the client). JRA.
 308                  */
 309                 if (state->numtowrite < 2) {
 310                         DEBUG(0,("reply_pipe_write_and_X: start of message "
 311                                  "set and not enough data sent.(%u)\n",
 312                                  (unsigned int)state->numtowrite ));
 313                         reply_nterror(req, NT_STATUS_INVALID_PARAMETER);
 314                         return;
 315                 }
 316
 317                 data += 2;
 318                 state->numtowrite -= 2;
 319         }
 320
 321         subreq = np_write_send(state, smbd_event_context(),
 322                                fsp->fake_file_handle, data, state->numtowrite);
 323         if (subreq == NULL) {
 324                 TALLOC_FREE(state);
 325                 reply_nterror(req, NT_STATUS_NO_MEMORY);
 326                 return;
 327         }
 328         tevent_req_set_callback(subreq, pipe_write_andx_done,
 329                                 talloc_move(req->conn, &req));
 330 }
 331
 332 static void pipe_write_andx_done(struct tevent_req *subreq)
 333 {
 334         struct smb_request *req = tevent_req_callback_data(
 335                 subreq, struct smb_request);
 336         struct pipe_write_andx_state *state = talloc_get_type_abort(
 337                 req->async_priv, struct pipe_write_andx_state);
 338         NTSTATUS status;
 339         ssize_t nwritten = -1;
 340
 341         status = np_write_recv(subreq, &nwritten);
 342         TALLOC_FREE(subreq);
 343
 344         if (!NT_STATUS_IS_OK(status)) {
 345                 reply_nterror(req, status);
 346                 goto done;
 347         }
 348
 349         /* Looks bogus to me now. Is this error message correct ? JRA. */
 350         if (nwritten != state->numtowrite) {
 351                 reply_nterror(req, NT_STATUS_ACCESS_DENIED);
 352                 goto done;
 353         }
 354
 355         reply_outbuf(req, 6, 0);
 356
 357         nwritten = (state->pipe_start_message_raw ? nwritten + 2 : nwritten);
 358         SSVAL(req->outbuf,smb_vwv2,nwritten);
 359
 360         DEBUG(3,("writeX-IPC nwritten=%d\n", (int)nwritten));
 361
 362  done:
 363         chain_reply(req);
 364         /*
 365          * We must free here as the ownership of req was
 366          * moved to the connection struct in reply_pipe_write_and_X().
 367          */
 368         TALLOC_FREE(req);
 369 }
 370
 371 /****************************************************************************
 372  Reply to a read and X.
 373  This code is basically stolen from reply_read_and_X with some
 374  wrinkles to handle pipes.
 375 ****************************************************************************/
 376
 377 struct pipe_read_andx_state {
 378         uint8_t *outbuf;
 379         int smb_mincnt;
 380         int smb_maxcnt;
 381 };
 382
 383 static void pipe_read_andx_done(struct tevent_req *subreq);
 384
 385 void reply_pipe_read_and_X(struct smb_request *req)
 386 {
 387         files_struct *fsp = file_fsp(req, SVAL(req->vwv+0, 0));
 388         uint8_t *data;
 389         struct pipe_read_andx_state *state;
 390         struct tevent_req *subreq;
 391
 392         /* we don't use the offset given to use for pipe reads. This
 393            is deliberate, instead we always return the next lump of
 394            data on the pipe */
 395 #if 0
 396         uint32 smb_offs = IVAL(req->vwv+3, 0);
 397 #endif
 398
 399         if (!fsp_is_np(fsp)) {
 400                 reply_nterror(req, NT_STATUS_INVALID_HANDLE);
 401                 return;
 402         }
 403
 404         if (fsp->vuid != req->vuid) {
 405                 reply_nterror(req, NT_STATUS_INVALID_HANDLE);
 406                 return;
 407         }
 408
 409         state = talloc(req, struct pipe_read_andx_state);
 410         if (state == NULL) {
 411                 reply_nterror(req, NT_STATUS_NO_MEMORY);
 412                 return;
 413         }
 414         req->async_priv = state;
 415
 416         state->smb_maxcnt = SVAL(req->vwv+5, 0);
 417         state->smb_mincnt = SVAL(req->vwv+6, 0);
 418
 419         reply_outbuf(req, 12, state->smb_maxcnt);
 420         data = (uint8_t *)smb_buf(req->outbuf);
 421
 422         /*
 423          * We have to tell the upper layers that we're async.
 424          */
 425         state->outbuf = req->outbuf;
 426         req->outbuf = NULL;
 427
 428         subreq = np_read_send(state, smbd_event_context(),
 429                               fsp->fake_file_handle, data,
 430                               state->smb_maxcnt);
 431         if (subreq == NULL) {
 432                 reply_nterror(req, NT_STATUS_NO_MEMORY);
 433                 return;
 434         }
 435         tevent_req_set_callback(subreq, pipe_read_andx_done,
 436                                 talloc_move(req->conn, &req));
 437 }
 438
 439 static void pipe_read_andx_done(struct tevent_req *subreq)
 440 {
 441         struct smb_request *req = tevent_req_callback_data(
 442                 subreq, struct smb_request);
 443         struct pipe_read_andx_state *state = talloc_get_type_abort(
 444                 req->async_priv, struct pipe_read_andx_state);
 445         NTSTATUS status;
 446         ssize_t nread;
 447         bool is_data_outstanding;
 448
 449         status = np_read_recv(subreq, &nread, &is_data_outstanding);
 450         TALLOC_FREE(subreq);
 451         if (!NT_STATUS_IS_OK(status)) {
 452                 reply_nterror(req, status);
 453                 goto done;
 454         }
 455
 456         req->outbuf = state->outbuf;
 457         state->outbuf = NULL;
 458
 459         srv_set_message((char *)req->outbuf, 12, nread, False);
 460
 461 #if 0
 462         /*
 463          * we should return STATUS_BUFFER_OVERFLOW if there's
 464          * out standing data.
 465          *
 466          * But we can't enable it yet, as it has bad interactions
 467          * with fixup_chain_error_packet() in chain_reply().
 468          */
 469         if (is_data_outstanding) {
 470                 error_packet_set((char *)req->outbuf, ERRDOS, ERRmoredata,
 471                                  STATUS_BUFFER_OVERFLOW, __LINE__, __FILE__);
 472         }
 473 #endif
 474
 475         SSVAL(req->outbuf,smb_vwv5,nread);
 476         SSVAL(req->outbuf,smb_vwv6,
 477               req_wct_ofs(req)
 478               + 1               /* the wct field */
 479               + 12 * sizeof(uint16_t) /* vwv */
 480               + 2);             /* the buflen field */
 481         SSVAL(req->outbuf,smb_vwv11,state->smb_maxcnt);
 482
 483         DEBUG(3,("readX-IPC min=%d max=%d nread=%d\n",
 484                  state->smb_mincnt, state->smb_maxcnt, (int)nread));
 485
 486  done:
 487         chain_reply(req);
 488         /*
 489          * We must free here as the ownership of req was
 490          * moved to the connection struct in reply_pipe_read_and_X().
 491          */
 492         TALLOC_FREE(req);
 493 }