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->ev_ctx,
  71                          conn->sconn->msg_ctx,
  72                          &fsp->fake_file_handle);
  73         if (!NT_STATUS_IS_OK(status)) {
  74                 DEBUG(10, ("np_open(%s) returned %s\n", name,
  75                            nt_errstr(status)));
  76                 file_free(smb_req, fsp);
  77                 return status;
  78         }
  79
  80         *pfsp = fsp;
  81
  82         return NT_STATUS_OK;
  83 }
  84
  85 /****************************************************************************
  86  Reply to an open and X on a named pipe.
  87  This code is basically stolen from reply_open_and_X with some
  88  wrinkles to handle pipes.
  89 ****************************************************************************/
  90
  91 void reply_open_pipe_and_X(connection_struct *conn, struct smb_request *req)
  92 {
  93         const char *fname = NULL;
  94         char *pipe_name = NULL;
  95         files_struct *fsp;
  96         TALLOC_CTX *ctx = talloc_tos();
  97         NTSTATUS status;
  98
  99         /* XXXX we need to handle passed times, sattr and flags */
 100         srvstr_pull_req_talloc(ctx, req, &pipe_name, req->buf, STR_TERMINATE);
 101         if (!pipe_name) {
 102                 reply_botherror(req, NT_STATUS_OBJECT_NAME_NOT_FOUND,
 103                                 ERRDOS, ERRbadpipe);
 104                 return;
 105         }
 106
 107         /* If the name doesn't start \PIPE\ then this is directed */
 108         /* at a mailslot or something we really, really don't understand, */
 109         /* not just something we really don't understand. */
 110
 111 #define PIPE            "PIPE\\"
 112 #define PIPELEN         strlen(PIPE)
 113
 114         fname = pipe_name;
 115         while (fname[0] == '\\') {
 116                 fname++;
 117         }
 118         if (!strnequal(fname, PIPE, PIPELEN)) {
 119                 reply_nterror(req, NT_STATUS_OBJECT_PATH_SYNTAX_BAD);
 120                 return;
 121         }
 122         fname += PIPELEN;
 123         while (fname[0] == '\\') {
 124                 fname++;
 125         }
 126
 127         DEBUG(4,("Opening pipe %s => %s.\n", pipe_name, fname));
 128
 129 #if 0
 130         /*
 131          * Hack for NT printers... JRA.
 132          */
 133         if(should_fail_next_srvsvc_open(fname)) {
 134                 reply_nterror(req, NT_STATUS_ACCESS_DENIED);
 135                 return;
 136         }
 137 #endif
 138
 139         status = open_np_file(req, fname, &fsp);
 140         if (!NT_STATUS_IS_OK(status)) {
 141                 if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
 142                         reply_botherror(req, NT_STATUS_OBJECT_NAME_NOT_FOUND,
 143                                         ERRDOS, ERRbadpipe);
 144                         return;
 145                 }
 146                 reply_nterror(req, status);
 147                 return;
 148         }
 149
 150         /* Prepare the reply */
 151         reply_outbuf(req, 15, 0);
 152
 153         SSVAL(req->outbuf, smb_vwv0, 0xff); /* andx chain ends */
 154         SSVAL(req->outbuf, smb_vwv1, 0);    /* no andx offset */
 155
 156         /* Mark the opened file as an existing named pipe in message mode. */
 157         SSVAL(req->outbuf,smb_vwv9,2);
 158         SSVAL(req->outbuf,smb_vwv10,0xc700);
 159
 160         SSVAL(req->outbuf, smb_vwv2, fsp->fnum);
 161         SSVAL(req->outbuf, smb_vwv3, 0);        /* fmode */
 162         srv_put_dos_date3((char *)req->outbuf, smb_vwv4, 0);    /* mtime */
 163         SIVAL(req->outbuf, smb_vwv6, 0);        /* size */
 164         SSVAL(req->outbuf, smb_vwv8, 0);        /* rmode */
 165         SSVAL(req->outbuf, smb_vwv11, 0x0001);
 166 }
 167
 168 /****************************************************************************
 169  Reply to a write on a pipe.
 170 ****************************************************************************/
 171
 172 struct pipe_write_state {
 173         size_t numtowrite;
 174 };
 175
 176 static void pipe_write_done(struct tevent_req *subreq);
 177
 178 void reply_pipe_write(struct smb_request *req)
 179 {
 180         files_struct *fsp = file_fsp(req, SVAL(req->vwv+0, 0));
 181         const uint8_t *data;
 182         struct pipe_write_state *state;
 183         struct tevent_req *subreq;
 184
 185         if (!fsp_is_np(fsp)) {
 186                 reply_nterror(req, NT_STATUS_INVALID_HANDLE);
 187                 return;
 188         }
 189
 190         if (fsp->vuid != req->vuid) {
 191                 reply_nterror(req, NT_STATUS_INVALID_HANDLE);
 192                 return;
 193         }
 194
 195         state = talloc(req, struct pipe_write_state);
 196         if (state == NULL) {
 197                 reply_nterror(req, NT_STATUS_NO_MEMORY);
 198                 return;
 199         }
 200         req->async_priv = state;
 201
 202         state->numtowrite = SVAL(req->vwv+1, 0);
 203
 204         data = req->buf + 3;
 205
 206         DEBUG(6, ("reply_pipe_write: %s, name: %s len: %d\n", fsp_fnum_dbg(fsp),
 207                   fsp_str_dbg(fsp), (int)state->numtowrite));
 208
 209         subreq = np_write_send(state, req->sconn->ev_ctx,
 210                                fsp->fake_file_handle, data, state->numtowrite);
 211         if (subreq == NULL) {
 212                 TALLOC_FREE(state);
 213                 reply_nterror(req, NT_STATUS_NO_MEMORY);
 214                 return;
 215         }
 216         tevent_req_set_callback(subreq, pipe_write_done,
 217                                 talloc_move(req->conn, &req));
 218 }
 219
 220 static void pipe_write_done(struct tevent_req *subreq)
 221 {
 222         struct smb_request *req = tevent_req_callback_data(
 223                 subreq, struct smb_request);
 224         struct pipe_write_state *state = talloc_get_type_abort(
 225                 req->async_priv, struct pipe_write_state);
 226         NTSTATUS status;
 227         ssize_t nwritten = -1;
 228
 229         status = np_write_recv(subreq, &nwritten);
 230         TALLOC_FREE(subreq);
 231         if (nwritten < 0) {
 232                 reply_nterror(req, status);
 233                 goto send;
 234         }
 235
 236         /* Looks bogus to me now. Needs to be removed ? JRA. */
 237         if ((nwritten == 0 && state->numtowrite != 0)) {
 238                 reply_nterror(req, NT_STATUS_ACCESS_DENIED);
 239                 goto send;
 240         }
 241
 242         reply_outbuf(req, 1, 0);
 243
 244         SSVAL(req->outbuf,smb_vwv0,nwritten);
 245
 246         DEBUG(3,("write-IPC nwritten=%d\n", (int)nwritten));
 247
 248  send:
 249         if (!srv_send_smb(req->xconn, (char *)req->outbuf,
 250                           true, req->seqnum+1,
 251                           IS_CONN_ENCRYPTED(req->conn)||req->encrypted,
 252                           &req->pcd)) {
 253                 exit_server_cleanly("construct_reply: srv_send_smb failed.");
 254         }
 255         TALLOC_FREE(req);
 256 }
 257
 258 /****************************************************************************
 259  Reply to a write and X.
 260
 261  This code is basically stolen from reply_write_and_X with some
 262  wrinkles to handle pipes.
 263 ****************************************************************************/
 264
 265 struct pipe_write_andx_state {
 266         bool pipe_start_message_raw;
 267         size_t numtowrite;
 268 };
 269
 270 static void pipe_write_andx_done(struct tevent_req *subreq);
 271
 272 void reply_pipe_write_and_X(struct smb_request *req)
 273 {
 274         files_struct *fsp = file_fsp(req, SVAL(req->vwv+2, 0));
 275         int smb_doff = SVAL(req->vwv+11, 0);
 276         const uint8_t *data;
 277         struct pipe_write_andx_state *state;
 278         struct tevent_req *subreq;
 279
 280         if (!fsp_is_np(fsp)) {
 281                 reply_nterror(req, NT_STATUS_INVALID_HANDLE);
 282                 return;
 283         }
 284
 285         if (fsp->vuid != req->vuid) {
 286                 reply_nterror(req, NT_STATUS_INVALID_HANDLE);
 287                 return;
 288         }
 289
 290         state = talloc(req, struct pipe_write_andx_state);
 291         if (state == NULL) {
 292                 reply_nterror(req, NT_STATUS_NO_MEMORY);
 293                 return;
 294         }
 295         req->async_priv = state;
 296
 297         state->numtowrite = SVAL(req->vwv+10, 0);
 298         state->pipe_start_message_raw =
 299                 ((SVAL(req->vwv+7, 0) & (PIPE_START_MESSAGE|PIPE_RAW_MODE))
 300                  == (PIPE_START_MESSAGE|PIPE_RAW_MODE));
 301
 302         DEBUG(6, ("reply_pipe_write_and_X: %s, name: %s len: %d\n",
 303                   fsp_fnum_dbg(fsp), fsp_str_dbg(fsp), (int)state->numtowrite));
 304
 305         data = (const uint8_t *)smb_base(req->inbuf) + smb_doff;
 306
 307         if (state->pipe_start_message_raw) {
 308                 /*
 309                  * For the start of a message in named pipe byte mode,
 310                  * the first two bytes are a length-of-pdu field. Ignore
 311                  * them (we don't trust the client). JRA.
 312                  */
 313                 if (state->numtowrite < 2) {
 314                         DEBUG(0,("reply_pipe_write_and_X: start of message "
 315                                  "set and not enough data sent.(%u)\n",
 316                                  (unsigned int)state->numtowrite ));
 317                         reply_nterror(req, NT_STATUS_INVALID_PARAMETER);
 318                         return;
 319                 }
 320
 321                 data += 2;
 322                 state->numtowrite -= 2;
 323         }
 324
 325         subreq = np_write_send(state, req->sconn->ev_ctx,
 326                                fsp->fake_file_handle, data, state->numtowrite);
 327         if (subreq == NULL) {
 328                 TALLOC_FREE(state);
 329                 reply_nterror(req, NT_STATUS_NO_MEMORY);
 330                 return;
 331         }
 332         tevent_req_set_callback(subreq, pipe_write_andx_done,
 333                                 talloc_move(req->conn, &req));
 334 }
 335
 336 static void pipe_write_andx_done(struct tevent_req *subreq)
 337 {
 338         struct smb_request *req = tevent_req_callback_data(
 339                 subreq, struct smb_request);
 340         struct pipe_write_andx_state *state = talloc_get_type_abort(
 341                 req->async_priv, struct pipe_write_andx_state);
 342         NTSTATUS status;
 343         ssize_t nwritten = -1;
 344
 345         status = np_write_recv(subreq, &nwritten);
 346         TALLOC_FREE(subreq);
 347
 348         if (!NT_STATUS_IS_OK(status)) {
 349                 reply_nterror(req, status);
 350                 goto done;
 351         }
 352
 353         /* Looks bogus to me now. Is this error message correct ? JRA. */
 354         if (nwritten != state->numtowrite) {
 355                 reply_nterror(req, NT_STATUS_ACCESS_DENIED);
 356                 goto done;
 357         }
 358
 359         reply_outbuf(req, 6, 0);
 360
 361         SSVAL(req->outbuf, smb_vwv0, 0xff); /* andx chain ends */
 362         SSVAL(req->outbuf, smb_vwv1, 0);    /* no andx offset */
 363
 364         nwritten = (state->pipe_start_message_raw ? nwritten + 2 : nwritten);
 365         SSVAL(req->outbuf,smb_vwv2,nwritten);
 366
 367         DEBUG(3,("writeX-IPC nwritten=%d\n", (int)nwritten));
 368
 369  done:
 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         smb_request_done(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_t 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 + 1 /* padding byte */);
 426         SSVAL(req->outbuf, smb_vwv0, 0xff); /* andx chain ends */
 427         SSVAL(req->outbuf, smb_vwv1, 0);    /* no andx offset */
 428         SCVAL(smb_buf(req->outbuf), 0, 0); /* padding byte */
 429
 430         data = (uint8_t *)smb_buf(req->outbuf) + 1 /* padding byte */;
 431
 432         /*
 433          * We have to tell the upper layers that we're async.
 434          */
 435         state->outbuf = req->outbuf;
 436         req->outbuf = NULL;
 437
 438         subreq = np_read_send(state, req->sconn->ev_ctx,
 439                               fsp->fake_file_handle, data,
 440                               state->smb_maxcnt);
 441         if (subreq == NULL) {
 442                 reply_nterror(req, NT_STATUS_NO_MEMORY);
 443                 return;
 444         }
 445         tevent_req_set_callback(subreq, pipe_read_andx_done,
 446                                 talloc_move(req->conn, &req));
 447 }
 448
 449 static void pipe_read_andx_done(struct tevent_req *subreq)
 450 {
 451         struct smb_request *req = tevent_req_callback_data(
 452                 subreq, struct smb_request);
 453         struct pipe_read_andx_state *state = talloc_get_type_abort(
 454                 req->async_priv, struct pipe_read_andx_state);
 455         NTSTATUS status;
 456         ssize_t nread;
 457         bool is_data_outstanding;
 458
 459         status = np_read_recv(subreq, &nread, &is_data_outstanding);
 460         TALLOC_FREE(subreq);
 461         if (!NT_STATUS_IS_OK(status)) {
 462                 NTSTATUS old = status;
 463                 status = nt_status_np_pipe(old);
 464                 reply_nterror(req, status);
 465                 goto done;
 466         }
 467
 468         req->outbuf = state->outbuf;
 469         state->outbuf = NULL;
 470
 471         srv_set_message((char *)req->outbuf, 12, nread + 1 /* padding byte */,
 472                         false);
 473
 474 #if 0
 475         /*
 476          * we should return STATUS_BUFFER_OVERFLOW if there's
 477          * out standing data.
 478          *
 479          * But we can't enable it yet, as it has bad interactions
 480          * with fixup_chain_error_packet() in chain_reply().
 481          */
 482         if (is_data_outstanding) {
 483                 error_packet_set((char *)req->outbuf, ERRDOS, ERRmoredata,
 484                                  STATUS_BUFFER_OVERFLOW, __LINE__, __FILE__);
 485         }
 486 #endif
 487
 488         SSVAL(req->outbuf,smb_vwv5,nread);
 489         SSVAL(req->outbuf,smb_vwv6,
 490               (smb_wct - 4)     /* offset from smb header to wct */
 491               + 1               /* the wct field */
 492               + 12 * sizeof(uint16_t) /* vwv */
 493               + 2               /* the buflen field */
 494               + 1);             /* padding byte */
 495         SSVAL(req->outbuf,smb_vwv11,state->smb_maxcnt);
 496
 497         DEBUG(3,("readX-IPC min=%d max=%d nread=%d\n",
 498                  state->smb_mincnt, state->smb_maxcnt, (int)nread));
 499
 500  done:
 501         /*
 502          * We must free here as the ownership of req was
 503          * moved to the connection struct in reply_pipe_read_and_X().
 504          */
 505         smb_request_done(req);
 506 }