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