source3/smbd/smb1_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 #include "auth/auth_util.h"
  34 #include "librpc/rpc/dcerpc_helper.h"
  35
  36 /****************************************************************************
  37  Reply to an open and X on a named pipe.
  38  This code is basically stolen from reply_open_and_X with some
  39  wrinkles to handle pipes.
  40 ****************************************************************************/
  41
  42 void reply_open_pipe_and_X(connection_struct *conn, struct smb_request *req)
  43 {
  44         const char *fname = NULL;
  45         char *pipe_name = NULL;
  46         files_struct *fsp;
  47         TALLOC_CTX *ctx = talloc_tos();
  48         NTSTATUS status;
  49
  50         /* XXXX we need to handle passed times, sattr and flags */
  51         srvstr_pull_req_talloc(ctx, req, &pipe_name, req->buf, STR_TERMINATE);
  52         if (!pipe_name) {
  53                 reply_botherror(req, NT_STATUS_OBJECT_NAME_NOT_FOUND,
  54                                 ERRDOS, ERRbadpipe);
  55                 return;
  56         }
  57
  58         /* If the name doesn't start \PIPE\ then this is directed */
  59         /* at a mailslot or something we really, really don't understand, */
  60         /* not just something we really don't understand. */
  61
  62 #define PIPE            "PIPE\\"
  63 #define PIPELEN         strlen(PIPE)
  64
  65         fname = pipe_name;
  66         while (fname[0] == '\\') {
  67                 fname++;
  68         }
  69         if (!strnequal(fname, PIPE, PIPELEN)) {
  70                 reply_nterror(req, NT_STATUS_OBJECT_PATH_SYNTAX_BAD);
  71                 return;
  72         }
  73         fname += PIPELEN;
  74         while (fname[0] == '\\') {
  75                 fname++;
  76         }
  77
  78         DEBUG(4,("Opening pipe %s => %s.\n", pipe_name, fname));
  79
  80 #if 0
  81         /*
  82          * Hack for NT printers... JRA.
  83          */
  84         if(should_fail_next_srvsvc_open(fname)) {
  85                 reply_nterror(req, NT_STATUS_ACCESS_DENIED);
  86                 return;
  87         }
  88 #endif
  89
  90         status = open_np_file(req, fname, &fsp);
  91         if (!NT_STATUS_IS_OK(status)) {
  92                 if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
  93                         reply_botherror(req, NT_STATUS_OBJECT_NAME_NOT_FOUND,
  94                                         ERRDOS, ERRbadpipe);
  95                         return;
  96                 }
  97                 reply_nterror(req, status);
  98                 return;
  99         }
 100
 101         /* Prepare the reply */
 102         reply_smb1_outbuf(req, 15, 0);
 103
 104         SSVAL(req->outbuf, smb_vwv0, 0xff); /* andx chain ends */
 105         SSVAL(req->outbuf, smb_vwv1, 0);    /* no andx offset */
 106
 107         /* Mark the opened file as an existing named pipe in message mode. */
 108         SSVAL(req->outbuf,smb_vwv9,2);
 109         SSVAL(req->outbuf,smb_vwv10,0xc700);
 110
 111         SSVAL(req->outbuf, smb_vwv2, fsp->fnum);
 112         SSVAL(req->outbuf, smb_vwv3, 0);        /* fmode */
 113         srv_put_dos_date3((char *)req->outbuf, smb_vwv4, 0);    /* mtime */
 114         SIVAL(req->outbuf, smb_vwv6, 0);        /* size */
 115         SSVAL(req->outbuf, smb_vwv8, 0);        /* rmode */
 116         SSVAL(req->outbuf, smb_vwv11, 0x0001);
 117 }
 118
 119 /****************************************************************************
 120  Reply to a write and X.
 121
 122  This code is basically stolen from reply_write_and_X with some
 123  wrinkles to handle pipes.
 124 ****************************************************************************/
 125
 126 struct pipe_write_andx_state {
 127         bool pipe_start_message_raw;
 128         size_t numtowrite;
 129 };
 130
 131 static void pipe_write_andx_done(struct tevent_req *subreq);
 132
 133 void reply_pipe_write_and_X(struct smb_request *req)
 134 {
 135         files_struct *fsp = file_fsp(req, SVAL(req->vwv+2, 0));
 136         int smb_doff = SVAL(req->vwv+11, 0);
 137         const uint8_t *data;
 138         struct pipe_write_andx_state *state;
 139         struct tevent_req *subreq;
 140
 141         if (!fsp_is_np(fsp)) {
 142                 reply_nterror(req, NT_STATUS_INVALID_HANDLE);
 143                 return;
 144         }
 145
 146         if (fsp->vuid != req->vuid) {
 147                 reply_nterror(req, NT_STATUS_INVALID_HANDLE);
 148                 return;
 149         }
 150
 151         state = talloc(req, struct pipe_write_andx_state);
 152         if (state == NULL) {
 153                 reply_nterror(req, NT_STATUS_NO_MEMORY);
 154                 return;
 155         }
 156         req->async_priv = state;
 157
 158         state->numtowrite = SVAL(req->vwv+10, 0);
 159         state->pipe_start_message_raw =
 160                 ((SVAL(req->vwv+7, 0) & (PIPE_START_MESSAGE|PIPE_RAW_MODE))
 161                  == (PIPE_START_MESSAGE|PIPE_RAW_MODE));
 162
 163         DEBUG(6, ("reply_pipe_write_and_X: %s, name: %s len: %d\n",
 164                   fsp_fnum_dbg(fsp), fsp_str_dbg(fsp), (int)state->numtowrite));
 165
 166         data = (const uint8_t *)smb_base(req->inbuf) + smb_doff;
 167
 168         if (state->pipe_start_message_raw) {
 169                 /*
 170                  * For the start of a message in named pipe byte mode,
 171                  * the first two bytes are a length-of-pdu field. Ignore
 172                  * them (we don't trust the client). JRA.
 173                  */
 174                 if (state->numtowrite < 2) {
 175                         DEBUG(0,("reply_pipe_write_and_X: start of message "
 176                                  "set and not enough data sent.(%u)\n",
 177                                  (unsigned int)state->numtowrite ));
 178                         reply_nterror(req, NT_STATUS_INVALID_PARAMETER);
 179                         return;
 180                 }
 181
 182                 data += 2;
 183                 state->numtowrite -= 2;
 184         }
 185
 186         subreq = np_write_send(state, req->sconn->ev_ctx,
 187                                fsp->fake_file_handle, data, state->numtowrite);
 188         if (subreq == NULL) {
 189                 TALLOC_FREE(state);
 190                 reply_nterror(req, NT_STATUS_NO_MEMORY);
 191                 return;
 192         }
 193         tevent_req_set_callback(subreq, pipe_write_andx_done,
 194                                 talloc_move(req->conn, &req));
 195 }
 196
 197 static void pipe_write_andx_done(struct tevent_req *subreq)
 198 {
 199         struct smb_request *req = tevent_req_callback_data(
 200                 subreq, struct smb_request);
 201         struct pipe_write_andx_state *state = talloc_get_type_abort(
 202                 req->async_priv, struct pipe_write_andx_state);
 203         NTSTATUS status;
 204         ssize_t nwritten = -1;
 205
 206         status = np_write_recv(subreq, &nwritten);
 207         TALLOC_FREE(subreq);
 208
 209         if (!NT_STATUS_IS_OK(status)) {
 210                 reply_nterror(req, status);
 211                 goto done;
 212         }
 213
 214         /* Looks bogus to me now. Is this error message correct ? JRA. */
 215         if (nwritten != state->numtowrite) {
 216                 reply_nterror(req, NT_STATUS_ACCESS_DENIED);
 217                 goto done;
 218         }
 219
 220         reply_smb1_outbuf(req, 6, 0);
 221
 222         SSVAL(req->outbuf, smb_vwv0, 0xff); /* andx chain ends */
 223         SSVAL(req->outbuf, smb_vwv1, 0);    /* no andx offset */
 224
 225         nwritten = (state->pipe_start_message_raw ? nwritten + 2 : nwritten);
 226         SSVAL(req->outbuf,smb_vwv2,nwritten);
 227
 228         DEBUG(3,("writeX-IPC nwritten=%d\n", (int)nwritten));
 229
 230  done:
 231         /*
 232          * We must free here as the ownership of req was
 233          * moved to the connection struct in reply_pipe_write_and_X().
 234          */
 235         smb_request_done(req);
 236 }
 237
 238 /****************************************************************************
 239  Reply to a read and X.
 240  This code is basically stolen from reply_read_and_X with some
 241  wrinkles to handle pipes.
 242 ****************************************************************************/
 243
 244 struct pipe_read_andx_state {
 245         uint8_t *outbuf;
 246         int smb_mincnt;
 247         int smb_maxcnt;
 248 };
 249
 250 static void pipe_read_andx_done(struct tevent_req *subreq);
 251
 252 void reply_pipe_read_and_X(struct smb_request *req)
 253 {
 254         files_struct *fsp = file_fsp(req, SVAL(req->vwv+0, 0));
 255         uint8_t *data;
 256         struct pipe_read_andx_state *state;
 257         struct tevent_req *subreq;
 258
 259         /* we don't use the offset given to use for pipe reads. This
 260            is deliberate, instead we always return the next lump of
 261            data on the pipe */
 262 #if 0
 263         uint32_t smb_offs = IVAL(req->vwv+3, 0);
 264 #endif
 265
 266         if (!fsp_is_np(fsp)) {
 267                 reply_nterror(req, NT_STATUS_INVALID_HANDLE);
 268                 return;
 269         }
 270
 271         if (fsp->vuid != req->vuid) {
 272                 reply_nterror(req, NT_STATUS_INVALID_HANDLE);
 273                 return;
 274         }
 275
 276         state = talloc(req, struct pipe_read_andx_state);
 277         if (state == NULL) {
 278                 reply_nterror(req, NT_STATUS_NO_MEMORY);
 279                 return;
 280         }
 281         req->async_priv = state;
 282
 283         state->smb_maxcnt = SVAL(req->vwv+5, 0);
 284         state->smb_mincnt = SVAL(req->vwv+6, 0);
 285
 286         reply_smb1_outbuf(req, 12, state->smb_maxcnt + 1 /* padding byte */);
 287         SSVAL(req->outbuf, smb_vwv0, 0xff); /* andx chain ends */
 288         SSVAL(req->outbuf, smb_vwv1, 0);    /* no andx offset */
 289         SCVAL(smb_buf(req->outbuf), 0, 0); /* padding byte */
 290
 291         data = (uint8_t *)smb_buf(req->outbuf) + 1 /* padding byte */;
 292
 293         /*
 294          * We have to tell the upper layers that we're async.
 295          */
 296         state->outbuf = req->outbuf;
 297         req->outbuf = NULL;
 298
 299         subreq = np_read_send(state, req->sconn->ev_ctx,
 300                               fsp->fake_file_handle, data,
 301                               state->smb_maxcnt);
 302         if (subreq == NULL) {
 303                 reply_nterror(req, NT_STATUS_NO_MEMORY);
 304                 return;
 305         }
 306         tevent_req_set_callback(subreq, pipe_read_andx_done,
 307                                 talloc_move(req->conn, &req));
 308 }
 309
 310 static void pipe_read_andx_done(struct tevent_req *subreq)
 311 {
 312         struct smb_request *req = tevent_req_callback_data(
 313                 subreq, struct smb_request);
 314         struct pipe_read_andx_state *state = talloc_get_type_abort(
 315                 req->async_priv, struct pipe_read_andx_state);
 316         NTSTATUS status;
 317         ssize_t nread;
 318         bool is_data_outstanding;
 319
 320         status = np_read_recv(subreq, &nread, &is_data_outstanding);
 321         TALLOC_FREE(subreq);
 322         if (!NT_STATUS_IS_OK(status)) {
 323                 NTSTATUS old = status;
 324                 status = nt_status_np_pipe(old);
 325                 reply_nterror(req, status);
 326                 goto done;
 327         }
 328
 329         req->outbuf = state->outbuf;
 330         state->outbuf = NULL;
 331
 332         srv_smb1_set_message((char *)req->outbuf, 12, nread + 1 /* padding byte */,
 333                         false);
 334
 335 #if 0
 336         /*
 337          * we should return STATUS_BUFFER_OVERFLOW if there's
 338          * out standing data.
 339          *
 340          * But we can't enable it yet, as it has bad interactions
 341          * with fixup_chain_error_packet() in chain_reply().
 342          */
 343         if (is_data_outstanding) {
 344                 error_packet_set((char *)req->outbuf, ERRDOS, ERRmoredata,
 345                                  STATUS_BUFFER_OVERFLOW, __LINE__, __FILE__);
 346         }
 347 #endif
 348
 349         SSVAL(req->outbuf,smb_vwv5,nread);
 350         SSVAL(req->outbuf,smb_vwv6,
 351               (smb_wct - 4)     /* offset from smb header to wct */
 352               + 1               /* the wct field */
 353               + 12 * sizeof(uint16_t) /* vwv */
 354               + 2               /* the buflen field */
 355               + 1);             /* padding byte */
 356
 357         DEBUG(3,("readX-IPC min=%d max=%d nread=%d\n",
 358                  state->smb_mincnt, state->smb_maxcnt, (int)nread));
 359
 360  done:
 361         /*
 362          * We must free here as the ownership of req was
 363          * moved to the connection struct in reply_pipe_read_and_X().
 364          */
 365         smb_request_done(req);
 366 }
 367
 368 /****************************************************************************
 369  Reply to a write on a pipe.
 370 ****************************************************************************/
 371
 372 struct pipe_write_state {
 373         size_t numtowrite;
 374 };
 375
 376 static void pipe_write_done(struct tevent_req *subreq);
 377
 378 void reply_pipe_write(struct smb_request *req)
 379 {
 380         files_struct *fsp = file_fsp(req, SVAL(req->vwv+0, 0));
 381         const uint8_t *data;
 382         struct pipe_write_state *state;
 383         struct tevent_req *subreq;
 384
 385         if (!fsp_is_np(fsp)) {
 386                 reply_nterror(req, NT_STATUS_INVALID_HANDLE);
 387                 return;
 388         }
 389
 390         if (fsp->vuid != req->vuid) {
 391                 reply_nterror(req, NT_STATUS_INVALID_HANDLE);
 392                 return;
 393         }
 394
 395         state = talloc(req, struct pipe_write_state);
 396         if (state == NULL) {
 397                 reply_nterror(req, NT_STATUS_NO_MEMORY);
 398                 return;
 399         }
 400         req->async_priv = state;
 401
 402         state->numtowrite = SVAL(req->vwv+1, 0);
 403
 404         data = req->buf + 3;
 405
 406         DEBUG(6, ("reply_pipe_write: %s, name: %s len: %d\n", fsp_fnum_dbg(fsp),
 407                   fsp_str_dbg(fsp), (int)state->numtowrite));
 408
 409         subreq = np_write_send(state, req->sconn->ev_ctx,
 410                                fsp->fake_file_handle, data, state->numtowrite);
 411         if (subreq == NULL) {
 412                 TALLOC_FREE(state);
 413                 reply_nterror(req, NT_STATUS_NO_MEMORY);
 414                 return;
 415         }
 416         tevent_req_set_callback(subreq, pipe_write_done,
 417                                 talloc_move(req->conn, &req));
 418 }
 419
 420 static void pipe_write_done(struct tevent_req *subreq)
 421 {
 422         struct smb_request *req = tevent_req_callback_data(
 423                 subreq, struct smb_request);
 424         struct pipe_write_state *state = talloc_get_type_abort(
 425                 req->async_priv, struct pipe_write_state);
 426         NTSTATUS status;
 427         ssize_t nwritten = -1;
 428
 429         status = np_write_recv(subreq, &nwritten);
 430         TALLOC_FREE(subreq);
 431         if (nwritten < 0) {
 432                 reply_nterror(req, status);
 433                 goto send;
 434         }
 435
 436         /* Looks bogus to me now. Needs to be removed ? JRA. */
 437         if ((nwritten == 0 && state->numtowrite != 0)) {
 438                 reply_nterror(req, NT_STATUS_ACCESS_DENIED);
 439                 goto send;
 440         }
 441
 442         reply_smb1_outbuf(req, 1, 0);
 443
 444         SSVAL(req->outbuf,smb_vwv0,nwritten);
 445
 446         DEBUG(3,("write-IPC nwritten=%d\n", (int)nwritten));
 447
 448  send:
 449         if (!smb1_srv_send(req->xconn, (char *)req->outbuf,
 450                           true, req->seqnum+1,
 451                           IS_CONN_ENCRYPTED(req->conn)||req->encrypted,
 452                           &req->pcd)) {
 453                 exit_server_cleanly("construct_reply: smb1_srv_send failed.");
 454         }
 455         TALLOC_FREE(req);
 456 }