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 #include "rpc_server/srv_pipe_hnd.h"
  33
  34 #define PIPE            "\\PIPE\\"
  35 #define PIPELEN         strlen(PIPE)
  36
  37 #define MAX_PIPE_NAME_LEN       24
  38
  39 NTSTATUS open_np_file(struct smb_request *smb_req, const char *name,
  40                       struct files_struct **pfsp)
  41 {
  42         struct connection_struct *conn = smb_req->conn;
  43         struct files_struct *fsp;
  44         struct smb_filename *smb_fname = NULL;
  45         NTSTATUS status;
  46
  47         status = file_new(smb_req, conn, &fsp);
  48         if (!NT_STATUS_IS_OK(status)) {
  49                 DEBUG(0, ("file_new failed: %s\n", nt_errstr(status)));
  50                 return status;
  51         }
  52
  53         fsp->conn = conn;
  54         fsp->fh->fd = -1;
  55         fsp->vuid = smb_req->vuid;
  56         fsp->can_lock = false;
  57         fsp->access_mask = FILE_READ_DATA | FILE_WRITE_DATA;
  58
  59         status = create_synthetic_smb_fname(talloc_tos(), name, NULL, NULL,
  60                                             &smb_fname);
  61                 if (!NT_STATUS_IS_OK(status)) {
  62                 file_free(smb_req, fsp);
  63                 return status;
  64         }
  65         status = fsp_set_smb_fname(fsp, smb_fname);
  66         TALLOC_FREE(smb_fname);
  67         if (!NT_STATUS_IS_OK(status)) {
  68                 file_free(smb_req, fsp);
  69                 return status;
  70         }
  71
  72         status = np_open(fsp, name,
  73                          conn->sconn->local_address,
  74                          conn->sconn->remote_address,
  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         SSVAL(req->outbuf, smb_vwv0, 0xff); /* andx chain ends */
 150         SSVAL(req->outbuf, smb_vwv1, 0);    /* no andx offset */
 151
 152         /* Mark the opened file as an existing named pipe in message mode. */
 153         SSVAL(req->outbuf,smb_vwv9,2);
 154         SSVAL(req->outbuf,smb_vwv10,0xc700);
 155
 156         SSVAL(req->outbuf, smb_vwv2, fsp->fnum);
 157         SSVAL(req->outbuf, smb_vwv3, 0);        /* fmode */
 158         srv_put_dos_date3((char *)req->outbuf, smb_vwv4, 0);    /* mtime */
 159         SIVAL(req->outbuf, smb_vwv6, 0);        /* size */
 160         SSVAL(req->outbuf, smb_vwv8, 0);        /* rmode */
 161         SSVAL(req->outbuf, smb_vwv11, 0x0001);
 162
 163         chain_reply(req);
 164         return;
 165 }
 166
 167 /****************************************************************************
 168  Reply to a write on a pipe.
 169 ****************************************************************************/
 170
 171 struct pipe_write_state {
 172         size_t numtowrite;
 173 };
 174
 175 static void pipe_write_done(struct tevent_req *subreq);
 176
 177 void reply_pipe_write(struct smb_request *req)
 178 {
 179         files_struct *fsp = file_fsp(req, SVAL(req->vwv+0, 0));
 180         const uint8_t *data;
 181         struct pipe_write_state *state;
 182         struct tevent_req *subreq;
 183
 184         if (!fsp_is_np(fsp)) {
 185                 reply_nterror(req, NT_STATUS_INVALID_HANDLE);
 186                 return;
 187         }
 188
 189         if (fsp->vuid != req->vuid) {
 190                 reply_nterror(req, NT_STATUS_INVALID_HANDLE);
 191                 return;
 192         }
 193
 194         state = talloc(req, struct pipe_write_state);
 195         if (state == NULL) {
 196                 reply_nterror(req, NT_STATUS_NO_MEMORY);
 197                 return;
 198         }
 199         req->async_priv = state;
 200
 201         state->numtowrite = SVAL(req->vwv+1, 0);
 202
 203         data = req->buf + 3;
 204
 205         DEBUG(6, ("reply_pipe_write: %x name: %s len: %d\n", (int)fsp->fnum,
 206                   fsp_str_dbg(fsp), (int)state->numtowrite));
 207
 208         subreq = np_write_send(state, req->sconn->ev_ctx,
 209                                fsp->fake_file_handle, data, state->numtowrite);
 210         if (subreq == NULL) {
 211                 TALLOC_FREE(state);
 212                 reply_nterror(req, NT_STATUS_NO_MEMORY);
 213                 return;
 214         }
 215         tevent_req_set_callback(subreq, pipe_write_done,
 216                                 talloc_move(req->conn, &req));
 217 }
 218
 219 static void pipe_write_done(struct tevent_req *subreq)
 220 {
 221         struct smb_request *req = tevent_req_callback_data(
 222                 subreq, struct smb_request);
 223         struct pipe_write_state *state = talloc_get_type_abort(
 224                 req->async_priv, struct pipe_write_state);
 225         NTSTATUS status;
 226         ssize_t nwritten = -1;
 227
 228         status = np_write_recv(subreq, &nwritten);
 229         TALLOC_FREE(subreq);
 230         if (nwritten < 0) {
 231                 reply_nterror(req, status);
 232                 goto send;
 233         }
 234
 235         /* Looks bogus to me now. Needs to be removed ? JRA. */
 236         if ((nwritten == 0 && state->numtowrite != 0)) {
 237                 reply_nterror(req, NT_STATUS_ACCESS_DENIED);
 238                 goto send;
 239         }
 240
 241         reply_outbuf(req, 1, 0);
 242
 243         SSVAL(req->outbuf,smb_vwv0,nwritten);
 244
 245         DEBUG(3,("write-IPC nwritten=%d\n", (int)nwritten));
 246
 247  send:
 248         if (!srv_send_smb(req->sconn, (char *)req->outbuf,
 249                           true, req->seqnum+1,
 250                           IS_CONN_ENCRYPTED(req->conn)||req->encrypted,
 251                           &req->pcd)) {
 252                 exit_server_cleanly("construct_reply: srv_send_smb failed.");
 253         }
 254         TALLOC_FREE(req);
 255 }
 256
 257 /****************************************************************************
 258  Reply to a write and X.
 259
 260  This code is basically stolen from reply_write_and_X with some
 261  wrinkles to handle pipes.
 262 ****************************************************************************/
 263
 264 struct pipe_write_andx_state {
 265         bool pipe_start_message_raw;
 266         size_t numtowrite;
 267 };
 268
 269 static void pipe_write_andx_done(struct tevent_req *subreq);
 270
 271 void reply_pipe_write_and_X(struct smb_request *req)
 272 {
 273         files_struct *fsp = file_fsp(req, SVAL(req->vwv+2, 0));
 274         int smb_doff = SVAL(req->vwv+11, 0);
 275         const uint8_t *data;
 276         struct pipe_write_andx_state *state;
 277         struct tevent_req *subreq;
 278
 279         if (!fsp_is_np(fsp)) {
 280                 reply_nterror(req, NT_STATUS_INVALID_HANDLE);
 281                 return;
 282         }
 283
 284         if (fsp->vuid != req->vuid) {
 285                 reply_nterror(req, NT_STATUS_INVALID_HANDLE);
 286                 return;
 287         }
 288
 289         state = talloc(req, struct pipe_write_andx_state);
 290         if (state == NULL) {
 291                 reply_nterror(req, NT_STATUS_NO_MEMORY);
 292                 return;
 293         }
 294         req->async_priv = state;
 295
 296         state->numtowrite = SVAL(req->vwv+10, 0);
 297         state->pipe_start_message_raw =
 298                 ((SVAL(req->vwv+7, 0) & (PIPE_START_MESSAGE|PIPE_RAW_MODE))
 299                  == (PIPE_START_MESSAGE|PIPE_RAW_MODE));
 300
 301         DEBUG(6, ("reply_pipe_write_and_X: %x name: %s len: %d\n",
 302                   (int)fsp->fnum, fsp_str_dbg(fsp), (int)state->numtowrite));
 303
 304         data = (const uint8_t *)smb_base(req->inbuf) + smb_doff;
 305
 306         if (state->pipe_start_message_raw) {
 307                 /*
 308                  * For the start of a message in named pipe byte mode,
 309                  * the first two bytes are a length-of-pdu field. Ignore
 310                  * them (we don't trust the client). JRA.
 311                  */
 312                 if (state->numtowrite < 2) {
 313                         DEBUG(0,("reply_pipe_write_and_X: start of message "
 314                                  "set and not enough data sent.(%u)\n",
 315                                  (unsigned int)state->numtowrite ));
 316                         reply_nterror(req, NT_STATUS_INVALID_PARAMETER);
 317                         return;
 318                 }
 319
 320                 data += 2;
 321                 state->numtowrite -= 2;
 322         }
 323
 324         subreq = np_write_send(state, req->sconn->ev_ctx,
 325                                fsp->fake_file_handle, data, state->numtowrite);
 326         if (subreq == NULL) {
 327                 TALLOC_FREE(state);
 328                 reply_nterror(req, NT_STATUS_NO_MEMORY);
 329                 return;
 330         }
 331         tevent_req_set_callback(subreq, pipe_write_andx_done,
 332                                 talloc_move(req->conn, &req));
 333 }
 334
 335 static void pipe_write_andx_done(struct tevent_req *subreq)
 336 {
 337         struct smb_request *req = tevent_req_callback_data(
 338                 subreq, struct smb_request);
 339         struct pipe_write_andx_state *state = talloc_get_type_abort(
 340                 req->async_priv, struct pipe_write_andx_state);
 341         NTSTATUS status;
 342         ssize_t nwritten = -1;
 343
 344         status = np_write_recv(subreq, &nwritten);
 345         TALLOC_FREE(subreq);
 346
 347         if (!NT_STATUS_IS_OK(status)) {
 348                 reply_nterror(req, status);
 349                 goto done;
 350         }
 351
 352         /* Looks bogus to me now. Is this error message correct ? JRA. */
 353         if (nwritten != state->numtowrite) {
 354                 reply_nterror(req, NT_STATUS_ACCESS_DENIED);
 355                 goto done;
 356         }
 357
 358         reply_outbuf(req, 6, 0);
 359
 360         SSVAL(req->outbuf, smb_vwv0, 0xff); /* andx chain ends */
 361         SSVAL(req->outbuf, smb_vwv1, 0);    /* no andx offset */
 362
 363         nwritten = (state->pipe_start_message_raw ? nwritten + 2 : nwritten);
 364         SSVAL(req->outbuf,smb_vwv2,nwritten);
 365
 366         DEBUG(3,("writeX-IPC nwritten=%d\n", (int)nwritten));
 367
 368  done:
 369         chain_reply(req);
 370         /*
 371          * We must free here as the ownership of req was
 372          * moved to the connection struct in reply_pipe_write_and_X().
 373          */
 374         TALLOC_FREE(req);
 375 }
 376
 377 /****************************************************************************
 378  Reply to a read and X.
 379  This code is basically stolen from reply_read_and_X with some
 380  wrinkles to handle pipes.
 381 ****************************************************************************/
 382
 383 struct pipe_read_andx_state {
 384         uint8_t *outbuf;
 385         int smb_mincnt;
 386         int smb_maxcnt;
 387 };
 388
 389 static void pipe_read_andx_done(struct tevent_req *subreq);
 390
 391 void reply_pipe_read_and_X(struct smb_request *req)
 392 {
 393         files_struct *fsp = file_fsp(req, SVAL(req->vwv+0, 0));
 394         uint8_t *data;
 395         struct pipe_read_andx_state *state;
 396         struct tevent_req *subreq;
 397
 398         /* we don't use the offset given to use for pipe reads. This
 399            is deliberate, instead we always return the next lump of
 400            data on the pipe */
 401 #if 0
 402         uint32 smb_offs = IVAL(req->vwv+3, 0);
 403 #endif
 404
 405         if (!fsp_is_np(fsp)) {
 406                 reply_nterror(req, NT_STATUS_INVALID_HANDLE);
 407                 return;
 408         }
 409
 410         if (fsp->vuid != req->vuid) {
 411                 reply_nterror(req, NT_STATUS_INVALID_HANDLE);
 412                 return;
 413         }
 414
 415         state = talloc(req, struct pipe_read_andx_state);
 416         if (state == NULL) {
 417                 reply_nterror(req, NT_STATUS_NO_MEMORY);
 418                 return;
 419         }
 420         req->async_priv = state;
 421
 422         state->smb_maxcnt = SVAL(req->vwv+5, 0);
 423         state->smb_mincnt = SVAL(req->vwv+6, 0);
 424
 425         reply_outbuf(req, 12, state->smb_maxcnt);
 426         SSVAL(req->outbuf, smb_vwv0, 0xff); /* andx chain ends */
 427         SSVAL(req->outbuf, smb_vwv1, 0);    /* no andx offset */
 428
 429         data = (uint8_t *)smb_buf(req->outbuf);
 430
 431         /*
 432          * We have to tell the upper layers that we're async.
 433          */
 434         state->outbuf = req->outbuf;
 435         req->outbuf = NULL;
 436
 437         subreq = np_read_send(state, req->sconn->ev_ctx,
 438                               fsp->fake_file_handle, data,
 439                               state->smb_maxcnt);
 440         if (subreq == NULL) {
 441                 reply_nterror(req, NT_STATUS_NO_MEMORY);
 442                 return;
 443         }
 444         tevent_req_set_callback(subreq, pipe_read_andx_done,
 445                                 talloc_move(req->conn, &req));
 446 }
 447
 448 static void pipe_read_andx_done(struct tevent_req *subreq)
 449 {
 450         struct smb_request *req = tevent_req_callback_data(
 451                 subreq, struct smb_request);
 452         struct pipe_read_andx_state *state = talloc_get_type_abort(
 453                 req->async_priv, struct pipe_read_andx_state);
 454         NTSTATUS status;
 455         ssize_t nread;
 456         bool is_data_outstanding;
 457
 458         status = np_read_recv(subreq, &nread, &is_data_outstanding);
 459         TALLOC_FREE(subreq);
 460         if (!NT_STATUS_IS_OK(status)) {
 461                 reply_nterror(req, status);
 462                 goto done;
 463         }
 464
 465         req->outbuf = state->outbuf;
 466         state->outbuf = NULL;
 467
 468         srv_set_message((char *)req->outbuf, 12, nread, False);
 469
 470 #if 0
 471         /*
 472          * we should return STATUS_BUFFER_OVERFLOW if there's
 473          * out standing data.
 474          *
 475          * But we can't enable it yet, as it has bad interactions
 476          * with fixup_chain_error_packet() in chain_reply().
 477          */
 478         if (is_data_outstanding) {
 479                 error_packet_set((char *)req->outbuf, ERRDOS, ERRmoredata,
 480                                  STATUS_BUFFER_OVERFLOW, __LINE__, __FILE__);
 481         }
 482 #endif
 483
 484         SSVAL(req->outbuf,smb_vwv5,nread);
 485         SSVAL(req->outbuf,smb_vwv6,
 486               req_wct_ofs(req)
 487               + 1               /* the wct field */
 488               + 12 * sizeof(uint16_t) /* vwv */
 489               + 2);             /* the buflen field */
 490         SSVAL(req->outbuf,smb_vwv11,state->smb_maxcnt);
 491
 492         DEBUG(3,("readX-IPC min=%d max=%d nread=%d\n",
 493                  state->smb_mincnt, state->smb_maxcnt, (int)nread));
 494
 495  done:
 496         chain_reply(req);
 497         /*
 498          * We must free here as the ownership of req was
 499          * moved to the connection struct in reply_pipe_read_and_X().
 500          */
 501         TALLOC_FREE(req);
 502 }