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->sconn->client_id,
  76                          conn->session_info,
  77                          conn->sconn->msg_ctx,
  78                          &fsp->fake_file_handle);
  79         if (!NT_STATUS_IS_OK(status)) {
  80                 DEBUG(10, ("np_open(%s) returned %s\n", name,
  81                            nt_errstr(status)));
  82                 file_free(smb_req, fsp);
  83                 return status;
  84         }
  85
  86         *pfsp = fsp;
  87
  88         return NT_STATUS_OK;
  89 }
  90
  91 /****************************************************************************
  92  Reply to an open and X on a named pipe.
  93  This code is basically stolen from reply_open_and_X with some
  94  wrinkles to handle pipes.
  95 ****************************************************************************/
  96
  97 void reply_open_pipe_and_X(connection_struct *conn, struct smb_request *req)
  98 {
  99         const char *fname = NULL;
 100         char *pipe_name = NULL;
 101         files_struct *fsp;
 102         TALLOC_CTX *ctx = talloc_tos();
 103         NTSTATUS status;
 104
 105         /* XXXX we need to handle passed times, sattr and flags */
 106         srvstr_pull_req_talloc(ctx, req, &pipe_name, req->buf, STR_TERMINATE);
 107         if (!pipe_name) {
 108                 reply_botherror(req, NT_STATUS_OBJECT_NAME_NOT_FOUND,
 109                                 ERRDOS, ERRbadpipe);
 110                 return;
 111         }
 112
 113         /* If the name doesn't start \PIPE\ then this is directed */
 114         /* at a mailslot or something we really, really don't understand, */
 115         /* not just something we really don't understand. */
 116         if ( strncmp(pipe_name,PIPE,PIPELEN) != 0 ) {
 117                 reply_nterror(req, NT_STATUS_ACCESS_DENIED);
 118                 return;
 119         }
 120
 121         DEBUG(4,("Opening pipe %s.\n", pipe_name));
 122
 123         /* Strip \PIPE\ off the name. */
 124         fname = pipe_name + PIPELEN;
 125
 126 #if 0
 127         /*
 128          * Hack for NT printers... JRA.
 129          */
 130         if(should_fail_next_srvsvc_open(fname)) {
 131                 reply_nterror(req, NT_STATUS_ACCESS_DENIED);
 132                 return;
 133         }
 134 #endif
 135
 136         status = open_np_file(req, fname, &fsp);
 137         if (!NT_STATUS_IS_OK(status)) {
 138                 if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
 139                         reply_botherror(req, NT_STATUS_OBJECT_NAME_NOT_FOUND,
 140                                         ERRDOS, ERRbadpipe);
 141                         return;
 142                 }
 143                 reply_nterror(req, status);
 144                 return;
 145         }
 146
 147         /* Prepare the reply */
 148         reply_outbuf(req, 15, 0);
 149
 150         /* Mark the opened file as an existing named pipe in message mode. */
 151         SSVAL(req->outbuf,smb_vwv9,2);
 152         SSVAL(req->outbuf,smb_vwv10,0xc700);
 153
 154         SSVAL(req->outbuf, smb_vwv2, fsp->fnum);
 155         SSVAL(req->outbuf, smb_vwv3, 0);        /* fmode */
 156         srv_put_dos_date3((char *)req->outbuf, smb_vwv4, 0);    /* mtime */
 157         SIVAL(req->outbuf, smb_vwv6, 0);        /* size */
 158         SSVAL(req->outbuf, smb_vwv8, 0);        /* rmode */
 159         SSVAL(req->outbuf, smb_vwv11, 0x0001);
 160
 161         chain_reply(req);
 162         return;
 163 }
 164
 165 /****************************************************************************
 166  Reply to a write on a pipe.
 167 ****************************************************************************/
 168
 169 struct pipe_write_state {
 170         size_t numtowrite;
 171 };
 172
 173 static void pipe_write_done(struct tevent_req *subreq);
 174
 175 void reply_pipe_write(struct smb_request *req)
 176 {
 177         files_struct *fsp = file_fsp(req, SVAL(req->vwv+0, 0));
 178         const uint8_t *data;
 179         struct pipe_write_state *state;
 180         struct tevent_req *subreq;
 181
 182         if (!fsp_is_np(fsp)) {
 183                 reply_nterror(req, NT_STATUS_INVALID_HANDLE);
 184                 return;
 185         }
 186
 187         if (fsp->vuid != req->vuid) {
 188                 reply_nterror(req, NT_STATUS_INVALID_HANDLE);
 189                 return;
 190         }
 191
 192         state = talloc(req, struct pipe_write_state);
 193         if (state == NULL) {
 194                 reply_nterror(req, NT_STATUS_NO_MEMORY);
 195                 return;
 196         }
 197         req->async_priv = state;
 198
 199         state->numtowrite = SVAL(req->vwv+1, 0);
 200
 201         data = req->buf + 3;
 202
 203         DEBUG(6, ("reply_pipe_write: %x name: %s len: %d\n", (int)fsp->fnum,
 204                   fsp_str_dbg(fsp), (int)state->numtowrite));
 205
 206         subreq = np_write_send(state, server_event_context(),
 207                                fsp->fake_file_handle, data, state->numtowrite);
 208         if (subreq == NULL) {
 209                 TALLOC_FREE(state);
 210                 reply_nterror(req, NT_STATUS_NO_MEMORY);
 211                 return;
 212         }
 213         tevent_req_set_callback(subreq, pipe_write_done,
 214                                 talloc_move(req->conn, &req));
 215 }
 216
 217 static void pipe_write_done(struct tevent_req *subreq)
 218 {
 219         struct smb_request *req = tevent_req_callback_data(
 220                 subreq, struct smb_request);
 221         struct pipe_write_state *state = talloc_get_type_abort(
 222                 req->async_priv, struct pipe_write_state);
 223         NTSTATUS status;
 224         ssize_t nwritten = -1;
 225
 226         status = np_write_recv(subreq, &nwritten);
 227         TALLOC_FREE(subreq);
 228         if (nwritten < 0) {
 229                 reply_nterror(req, status);
 230                 goto send;
 231         }
 232
 233         /* Looks bogus to me now. Needs to be removed ? JRA. */
 234         if ((nwritten == 0 && state->numtowrite != 0)) {
 235                 reply_nterror(req, NT_STATUS_ACCESS_DENIED);
 236                 goto send;
 237         }
 238
 239         reply_outbuf(req, 1, 0);
 240
 241         SSVAL(req->outbuf,smb_vwv0,nwritten);
 242
 243         DEBUG(3,("write-IPC nwritten=%d\n", (int)nwritten));
 244
 245  send:
 246         if (!srv_send_smb(req->sconn, (char *)req->outbuf,
 247                           true, req->seqnum+1,
 248                           IS_CONN_ENCRYPTED(req->conn)||req->encrypted,
 249                           &req->pcd)) {
 250                 exit_server_cleanly("construct_reply: srv_send_smb failed.");
 251         }
 252         TALLOC_FREE(req);
 253 }
 254
 255 /****************************************************************************
 256  Reply to a write and X.
 257
 258  This code is basically stolen from reply_write_and_X with some
 259  wrinkles to handle pipes.
 260 ****************************************************************************/
 261
 262 struct pipe_write_andx_state {
 263         bool pipe_start_message_raw;
 264         size_t numtowrite;
 265 };
 266
 267 static void pipe_write_andx_done(struct tevent_req *subreq);
 268
 269 void reply_pipe_write_and_X(struct smb_request *req)
 270 {
 271         files_struct *fsp = file_fsp(req, SVAL(req->vwv+2, 0));
 272         int smb_doff = SVAL(req->vwv+11, 0);
 273         const uint8_t *data;
 274         struct pipe_write_andx_state *state;
 275         struct tevent_req *subreq;
 276
 277         if (!fsp_is_np(fsp)) {
 278                 reply_nterror(req, NT_STATUS_INVALID_HANDLE);
 279                 return;
 280         }
 281
 282         if (fsp->vuid != req->vuid) {
 283                 reply_nterror(req, NT_STATUS_INVALID_HANDLE);
 284                 return;
 285         }
 286
 287         state = talloc(req, struct pipe_write_andx_state);
 288         if (state == NULL) {
 289                 reply_nterror(req, NT_STATUS_NO_MEMORY);
 290                 return;
 291         }
 292         req->async_priv = state;
 293
 294         state->numtowrite = SVAL(req->vwv+10, 0);
 295         state->pipe_start_message_raw =
 296                 ((SVAL(req->vwv+7, 0) & (PIPE_START_MESSAGE|PIPE_RAW_MODE))
 297                  == (PIPE_START_MESSAGE|PIPE_RAW_MODE));
 298
 299         DEBUG(6, ("reply_pipe_write_and_X: %x name: %s len: %d\n",
 300                   (int)fsp->fnum, fsp_str_dbg(fsp), (int)state->numtowrite));
 301
 302         data = (const uint8_t *)smb_base(req->inbuf) + smb_doff;
 303
 304         if (state->pipe_start_message_raw) {
 305                 /*
 306                  * For the start of a message in named pipe byte mode,
 307                  * the first two bytes are a length-of-pdu field. Ignore
 308                  * them (we don't trust the client). JRA.
 309                  */
 310                 if (state->numtowrite < 2) {
 311                         DEBUG(0,("reply_pipe_write_and_X: start of message "
 312                                  "set and not enough data sent.(%u)\n",
 313                                  (unsigned int)state->numtowrite ));
 314                         reply_nterror(req, NT_STATUS_INVALID_PARAMETER);
 315                         return;
 316                 }
 317
 318                 data += 2;
 319                 state->numtowrite -= 2;
 320         }
 321
 322         subreq = np_write_send(state, server_event_context(),
 323                                fsp->fake_file_handle, data, state->numtowrite);
 324         if (subreq == NULL) {
 325                 TALLOC_FREE(state);
 326                 reply_nterror(req, NT_STATUS_NO_MEMORY);
 327                 return;
 328         }
 329         tevent_req_set_callback(subreq, pipe_write_andx_done,
 330                                 talloc_move(req->conn, &req));
 331 }
 332
 333 static void pipe_write_andx_done(struct tevent_req *subreq)
 334 {
 335         struct smb_request *req = tevent_req_callback_data(
 336                 subreq, struct smb_request);
 337         struct pipe_write_andx_state *state = talloc_get_type_abort(
 338                 req->async_priv, struct pipe_write_andx_state);
 339         NTSTATUS status;
 340         ssize_t nwritten = -1;
 341
 342         status = np_write_recv(subreq, &nwritten);
 343         TALLOC_FREE(subreq);
 344
 345         if (!NT_STATUS_IS_OK(status)) {
 346                 reply_nterror(req, status);
 347                 goto done;
 348         }
 349
 350         /* Looks bogus to me now. Is this error message correct ? JRA. */
 351         if (nwritten != state->numtowrite) {
 352                 reply_nterror(req, NT_STATUS_ACCESS_DENIED);
 353                 goto done;
 354         }
 355
 356         reply_outbuf(req, 6, 0);
 357
 358         nwritten = (state->pipe_start_message_raw ? nwritten + 2 : nwritten);
 359         SSVAL(req->outbuf,smb_vwv2,nwritten);
 360
 361         DEBUG(3,("writeX-IPC nwritten=%d\n", (int)nwritten));
 362
 363  done:
 364         chain_reply(req);
 365         /*
 366          * We must free here as the ownership of req was
 367          * moved to the connection struct in reply_pipe_write_and_X().
 368          */
 369         TALLOC_FREE(req);
 370 }
 371
 372 /****************************************************************************
 373  Reply to a read and X.
 374  This code is basically stolen from reply_read_and_X with some
 375  wrinkles to handle pipes.
 376 ****************************************************************************/
 377
 378 struct pipe_read_andx_state {
 379         uint8_t *outbuf;
 380         int smb_mincnt;
 381         int smb_maxcnt;
 382 };
 383
 384 static void pipe_read_andx_done(struct tevent_req *subreq);
 385
 386 void reply_pipe_read_and_X(struct smb_request *req)
 387 {
 388         files_struct *fsp = file_fsp(req, SVAL(req->vwv+0, 0));
 389         uint8_t *data;
 390         struct pipe_read_andx_state *state;
 391         struct tevent_req *subreq;
 392
 393         /* we don't use the offset given to use for pipe reads. This
 394            is deliberate, instead we always return the next lump of
 395            data on the pipe */
 396 #if 0
 397         uint32 smb_offs = IVAL(req->vwv+3, 0);
 398 #endif
 399
 400         if (!fsp_is_np(fsp)) {
 401                 reply_nterror(req, NT_STATUS_INVALID_HANDLE);
 402                 return;
 403         }
 404
 405         if (fsp->vuid != req->vuid) {
 406                 reply_nterror(req, NT_STATUS_INVALID_HANDLE);
 407                 return;
 408         }
 409
 410         state = talloc(req, struct pipe_read_andx_state);
 411         if (state == NULL) {
 412                 reply_nterror(req, NT_STATUS_NO_MEMORY);
 413                 return;
 414         }
 415         req->async_priv = state;
 416
 417         state->smb_maxcnt = SVAL(req->vwv+5, 0);
 418         state->smb_mincnt = SVAL(req->vwv+6, 0);
 419
 420         reply_outbuf(req, 12, state->smb_maxcnt);
 421         data = (uint8_t *)smb_buf(req->outbuf);
 422
 423         /*
 424          * We have to tell the upper layers that we're async.
 425          */
 426         state->outbuf = req->outbuf;
 427         req->outbuf = NULL;
 428
 429         subreq = np_read_send(state, server_event_context(),
 430                               fsp->fake_file_handle, data,
 431                               state->smb_maxcnt);
 432         if (subreq == NULL) {
 433                 reply_nterror(req, NT_STATUS_NO_MEMORY);
 434                 return;
 435         }
 436         tevent_req_set_callback(subreq, pipe_read_andx_done,
 437                                 talloc_move(req->conn, &req));
 438 }
 439
 440 static void pipe_read_andx_done(struct tevent_req *subreq)
 441 {
 442         struct smb_request *req = tevent_req_callback_data(
 443                 subreq, struct smb_request);
 444         struct pipe_read_andx_state *state = talloc_get_type_abort(
 445                 req->async_priv, struct pipe_read_andx_state);
 446         NTSTATUS status;
 447         ssize_t nread;
 448         bool is_data_outstanding;
 449
 450         status = np_read_recv(subreq, &nread, &is_data_outstanding);
 451         TALLOC_FREE(subreq);
 452         if (!NT_STATUS_IS_OK(status)) {
 453                 reply_nterror(req, status);
 454                 goto done;
 455         }
 456
 457         req->outbuf = state->outbuf;
 458         state->outbuf = NULL;
 459
 460         srv_set_message((char *)req->outbuf, 12, nread, False);
 461
 462 #if 0
 463         /*
 464          * we should return STATUS_BUFFER_OVERFLOW if there's
 465          * out standing data.
 466          *
 467          * But we can't enable it yet, as it has bad interactions
 468          * with fixup_chain_error_packet() in chain_reply().
 469          */
 470         if (is_data_outstanding) {
 471                 error_packet_set((char *)req->outbuf, ERRDOS, ERRmoredata,
 472                                  STATUS_BUFFER_OVERFLOW, __LINE__, __FILE__);
 473         }
 474 #endif
 475
 476         SSVAL(req->outbuf,smb_vwv5,nread);
 477         SSVAL(req->outbuf,smb_vwv6,
 478               req_wct_ofs(req)
 479               + 1               /* the wct field */
 480               + 12 * sizeof(uint16_t) /* vwv */
 481               + 2);             /* the buflen field */
 482         SSVAL(req->outbuf,smb_vwv11,state->smb_maxcnt);
 483
 484         DEBUG(3,("readX-IPC min=%d max=%d nread=%d\n",
 485                  state->smb_mincnt, state->smb_maxcnt, (int)nread));
 486
 487  done:
 488         chain_reply(req);
 489         /*
 490          * We must free here as the ownership of req was
 491          * moved to the connection struct in reply_pipe_read_and_X().
 492          */
 493         TALLOC_FREE(req);
 494 }