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