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