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 NTSTATUS open_np_file(struct smb_request *smb_req, const char *name,
  35                       struct files_struct **pfsp)
  36 {
  37         struct connection_struct *conn = smb_req->conn;
  38         struct files_struct *fsp;
  39         struct smb_filename *smb_fname = NULL;
  40         NTSTATUS status;
  41
  42         status = file_new(smb_req, conn, &fsp);
  43         if (!NT_STATUS_IS_OK(status)) {
  44                 DEBUG(0, ("file_new failed: %s\n", nt_errstr(status)));
  45                 return status;
  46         }
  47
  48         fsp->conn = conn;
  49         fsp->fh->fd = -1;
  50         fsp->vuid = smb_req->vuid;
  51         fsp->can_lock = false;
  52         fsp->access_mask = FILE_READ_DATA | FILE_WRITE_DATA;
  53
  54         smb_fname = synthetic_smb_fname(talloc_tos(), name, NULL, NULL);
  55         if (smb_fname == NULL) {
  56                 file_free(smb_req, fsp);
  57                 return NT_STATUS_NO_MEMORY;
  58         }
  59         status = fsp_set_smb_fname(fsp, smb_fname);
  60         TALLOC_FREE(smb_fname);
  61         if (!NT_STATUS_IS_OK(status)) {
  62                 file_free(smb_req, fsp);
  63                 return status;
  64         }
  65
  66         status = np_open(fsp, name,
  67                          conn->sconn->local_address,
  68                          conn->sconn->remote_address,
  69                          conn->session_info,
  70                          conn->sconn->msg_ctx,
  71                          &fsp->fake_file_handle);
  72         if (!NT_STATUS_IS_OK(status)) {
  73                 DEBUG(10, ("np_open(%s) returned %s\n", name,
  74                            nt_errstr(status)));
  75                 file_free(smb_req, fsp);
  76                 return status;
  77         }
  78
  79         *pfsp = fsp;
  80
  81         return NT_STATUS_OK;
  82 }
  83
  84 /****************************************************************************
  85  Reply to an open and X on a named pipe.
  86  This code is basically stolen from reply_open_and_X with some
  87  wrinkles to handle pipes.
  88 ****************************************************************************/
  89
  90 void reply_open_pipe_and_X(connection_struct *conn, struct smb_request *req)
  91 {
  92         const char *fname = NULL;
  93         char *pipe_name = NULL;
  94         files_struct *fsp;
  95         TALLOC_CTX *ctx = talloc_tos();
  96         NTSTATUS status;
  97
  98         /* XXXX we need to handle passed times, sattr and flags */
  99         srvstr_pull_req_talloc(ctx, req, &pipe_name, req->buf, STR_TERMINATE);
 100         if (!pipe_name) {
 101                 reply_botherror(req, NT_STATUS_OBJECT_NAME_NOT_FOUND,
 102                                 ERRDOS, ERRbadpipe);
 103                 return;
 104         }
 105
 106         /* If the name doesn't start \PIPE\ then this is directed */
 107         /* at a mailslot or something we really, really don't understand, */
 108         /* not just something we really don't understand. */
 109
 110 #define PIPE            "PIPE\\"
 111 #define PIPELEN         strlen(PIPE)
 112
 113         fname = pipe_name;
 114         while (fname[0] == '\\') {
 115                 fname++;
 116         }
 117         if (!strnequal(fname, PIPE, PIPELEN)) {
 118                 reply_nterror(req, NT_STATUS_OBJECT_PATH_SYNTAX_BAD);
 119                 return;
 120         }
 121         fname += PIPELEN;
 122         while (fname[0] == '\\') {
 123                 fname++;
 124         }
 125
 126         DEBUG(4,("Opening pipe %s => %s.\n", pipe_name, fname));
 127
 128 #if 0
 129         /*
 130          * Hack for NT printers... JRA.
 131          */
 132         if(should_fail_next_srvsvc_open(fname)) {
 133                 reply_nterror(req, NT_STATUS_ACCESS_DENIED);
 134                 return;
 135         }
 136 #endif
 137
 138         status = open_np_file(req, fname, &fsp);
 139         if (!NT_STATUS_IS_OK(status)) {
 140                 if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
 141                         reply_botherror(req, NT_STATUS_OBJECT_NAME_NOT_FOUND,
 142                                         ERRDOS, ERRbadpipe);
 143                         return;
 144                 }
 145                 reply_nterror(req, status);
 146                 return;
 147         }
 148
 149         /* Prepare the reply */
 150         reply_outbuf(req, 15, 0);
 151
 152         SSVAL(req->outbuf, smb_vwv0, 0xff); /* andx chain ends */
 153         SSVAL(req->outbuf, smb_vwv1, 0);    /* no andx offset */
 154
 155         /* Mark the opened file as an existing named pipe in message mode. */
 156         SSVAL(req->outbuf,smb_vwv9,2);
 157         SSVAL(req->outbuf,smb_vwv10,0xc700);
 158
 159         SSVAL(req->outbuf, smb_vwv2, fsp->fnum);
 160         SSVAL(req->outbuf, smb_vwv3, 0);        /* fmode */
 161         srv_put_dos_date3((char *)req->outbuf, smb_vwv4, 0);    /* mtime */
 162         SIVAL(req->outbuf, smb_vwv6, 0);        /* size */
 163         SSVAL(req->outbuf, smb_vwv8, 0);        /* rmode */
 164         SSVAL(req->outbuf, smb_vwv11, 0x0001);
 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: %s, name: %s len: %d\n", fsp_fnum_dbg(fsp),
 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: %s, name: %s len: %d\n",
 302                   fsp_fnum_dbg(fsp), 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         /*
 370          * We must free here as the ownership of req was
 371          * moved to the connection struct in reply_pipe_write_and_X().
 372          */
 373         smb_request_done(req);
 374 }
 375
 376 /****************************************************************************
 377  Reply to a read and X.
 378  This code is basically stolen from reply_read_and_X with some
 379  wrinkles to handle pipes.
 380 ****************************************************************************/
 381
 382 struct pipe_read_andx_state {
 383         uint8_t *outbuf;
 384         int smb_mincnt;
 385         int smb_maxcnt;
 386 };
 387
 388 static void pipe_read_andx_done(struct tevent_req *subreq);
 389
 390 void reply_pipe_read_and_X(struct smb_request *req)
 391 {
 392         files_struct *fsp = file_fsp(req, SVAL(req->vwv+0, 0));
 393         uint8_t *data;
 394         struct pipe_read_andx_state *state;
 395         struct tevent_req *subreq;
 396
 397         /* we don't use the offset given to use for pipe reads. This
 398            is deliberate, instead we always return the next lump of
 399            data on the pipe */
 400 #if 0
 401         uint32 smb_offs = IVAL(req->vwv+3, 0);
 402 #endif
 403
 404         if (!fsp_is_np(fsp)) {
 405                 reply_nterror(req, NT_STATUS_INVALID_HANDLE);
 406                 return;
 407         }
 408
 409         if (fsp->vuid != req->vuid) {
 410                 reply_nterror(req, NT_STATUS_INVALID_HANDLE);
 411                 return;
 412         }
 413
 414         state = talloc(req, struct pipe_read_andx_state);
 415         if (state == NULL) {
 416                 reply_nterror(req, NT_STATUS_NO_MEMORY);
 417                 return;
 418         }
 419         req->async_priv = state;
 420
 421         state->smb_maxcnt = SVAL(req->vwv+5, 0);
 422         state->smb_mincnt = SVAL(req->vwv+6, 0);
 423
 424         reply_outbuf(req, 12, state->smb_maxcnt);
 425         SSVAL(req->outbuf, smb_vwv0, 0xff); /* andx chain ends */
 426         SSVAL(req->outbuf, smb_vwv1, 0);    /* no andx offset */
 427
 428         data = (uint8_t *)smb_buf(req->outbuf);
 429
 430         /*
 431          * We have to tell the upper layers that we're async.
 432          */
 433         state->outbuf = req->outbuf;
 434         req->outbuf = NULL;
 435
 436         subreq = np_read_send(state, req->sconn->ev_ctx,
 437                               fsp->fake_file_handle, data,
 438                               state->smb_maxcnt);
 439         if (subreq == NULL) {
 440                 reply_nterror(req, NT_STATUS_NO_MEMORY);
 441                 return;
 442         }
 443         tevent_req_set_callback(subreq, pipe_read_andx_done,
 444                                 talloc_move(req->conn, &req));
 445 }
 446
 447 static void pipe_read_andx_done(struct tevent_req *subreq)
 448 {
 449         struct smb_request *req = tevent_req_callback_data(
 450                 subreq, struct smb_request);
 451         struct pipe_read_andx_state *state = talloc_get_type_abort(
 452                 req->async_priv, struct pipe_read_andx_state);
 453         NTSTATUS status;
 454         ssize_t nread;
 455         bool is_data_outstanding;
 456
 457         status = np_read_recv(subreq, &nread, &is_data_outstanding);
 458         TALLOC_FREE(subreq);
 459         if (!NT_STATUS_IS_OK(status)) {
 460                 NTSTATUS old = status;
 461                 status = nt_status_np_pipe(old);
 462                 reply_nterror(req, status);
 463                 goto done;
 464         }
 465
 466         req->outbuf = state->outbuf;
 467         state->outbuf = NULL;
 468
 469         srv_set_message((char *)req->outbuf, 12, nread, False);
 470
 471 #if 0
 472         /*
 473          * we should return STATUS_BUFFER_OVERFLOW if there's
 474          * out standing data.
 475          *
 476          * But we can't enable it yet, as it has bad interactions
 477          * with fixup_chain_error_packet() in chain_reply().
 478          */
 479         if (is_data_outstanding) {
 480                 error_packet_set((char *)req->outbuf, ERRDOS, ERRmoredata,
 481                                  STATUS_BUFFER_OVERFLOW, __LINE__, __FILE__);
 482         }
 483 #endif
 484
 485         SSVAL(req->outbuf,smb_vwv5,nread);
 486         SSVAL(req->outbuf,smb_vwv6,
 487               (smb_wct - 4)     /* offset from smb header to wct */
 488               + 1               /* the wct field */
 489               + 12 * sizeof(uint16_t) /* vwv */
 490               + 2);             /* the buflen field */
 491         SSVAL(req->outbuf,smb_vwv11,state->smb_maxcnt);
 492
 493         DEBUG(3,("readX-IPC min=%d max=%d nread=%d\n",
 494                  state->smb_mincnt, state->smb_maxcnt, (int)nread));
 495
 496  done:
 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         smb_request_done(req);
 502 }