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
  30 #define PIPE            "\\PIPE\\"
  31 #define PIPELEN         strlen(PIPE)
  32
  33 #define MAX_PIPE_NAME_LEN       24
  34
  35 NTSTATUS open_np_file(struct smb_request *smb_req, const char *name,
  36                       struct files_struct **pfsp)
  37 {
  38         struct connection_struct *conn = smb_req->conn;
  39         struct files_struct *fsp;
  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         string_set(&fsp->fsp_name, name);
  54
  55         status = np_open(NULL, name, conn->client_address,
  56                          conn->server_info, &fsp->fake_file_handle);
  57         if (!NT_STATUS_IS_OK(status)) {
  58                 DEBUG(10, ("np_open(%s) returned %s\n", name,
  59                            nt_errstr(status)));
  60                 file_free(smb_req, fsp);
  61                 return status;
  62         }
  63
  64         *pfsp = fsp;
  65
  66         return NT_STATUS_OK;
  67 }
  68
  69 /****************************************************************************
  70  Reply to an open and X on a named pipe.
  71  This code is basically stolen from reply_open_and_X with some
  72  wrinkles to handle pipes.
  73 ****************************************************************************/
  74
  75 void reply_open_pipe_and_X(connection_struct *conn, struct smb_request *req)
  76 {
  77         const char *fname = NULL;
  78         char *pipe_name = NULL;
  79         files_struct *fsp;
  80         TALLOC_CTX *ctx = talloc_tos();
  81         NTSTATUS status;
  82
  83         /* XXXX we need to handle passed times, sattr and flags */
  84         srvstr_pull_req_talloc(ctx, req, &pipe_name, req->buf, STR_TERMINATE);
  85         if (!pipe_name) {
  86                 reply_botherror(req, NT_STATUS_OBJECT_NAME_NOT_FOUND,
  87                                 ERRDOS, ERRbadpipe);
  88                 return;
  89         }
  90
  91         /* If the name doesn't start \PIPE\ then this is directed */
  92         /* at a mailslot or something we really, really don't understand, */
  93         /* not just something we really don't understand. */
  94         if ( strncmp(pipe_name,PIPE,PIPELEN) != 0 ) {
  95                 reply_doserror(req, ERRSRV, ERRaccess);
  96                 return;
  97         }
  98
  99         DEBUG(4,("Opening pipe %s.\n", pipe_name));
 100
 101         /* Strip \PIPE\ off the name. */
 102         fname = pipe_name + PIPELEN;
 103
 104 #if 0
 105         /*
 106          * Hack for NT printers... JRA.
 107          */
 108         if(should_fail_next_srvsvc_open(fname)) {
 109                 reply_doserror(req, ERRSRV, ERRaccess);
 110                 return;
 111         }
 112 #endif
 113
 114         status = open_np_file(req, fname, &fsp);
 115         if (!NT_STATUS_IS_OK(status)) {
 116                 if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
 117                         reply_botherror(req, NT_STATUS_OBJECT_NAME_NOT_FOUND,
 118                                         ERRDOS, ERRbadpipe);
 119                         return;
 120                 }
 121                 reply_nterror(req, status);
 122                 return;
 123         }
 124
 125         /* Prepare the reply */
 126         reply_outbuf(req, 15, 0);
 127
 128         /* Mark the opened file as an existing named pipe in message mode. */
 129         SSVAL(req->outbuf,smb_vwv9,2);
 130         SSVAL(req->outbuf,smb_vwv10,0xc700);
 131
 132         SSVAL(req->outbuf, smb_vwv2, fsp->fnum);
 133         SSVAL(req->outbuf, smb_vwv3, 0);        /* fmode */
 134         srv_put_dos_date3((char *)req->outbuf, smb_vwv4, 0);    /* mtime */
 135         SIVAL(req->outbuf, smb_vwv6, 0);        /* size */
 136         SSVAL(req->outbuf, smb_vwv8, 0);        /* rmode */
 137         SSVAL(req->outbuf, smb_vwv11, 0x0001);
 138
 139         chain_reply(req);
 140         return;
 141 }
 142
 143 /****************************************************************************
 144  Reply to a write on a pipe.
 145 ****************************************************************************/
 146
 147 void reply_pipe_write(struct smb_request *req)
 148 {
 149         files_struct *fsp = file_fsp(req, SVAL(req->vwv+0, 0));
 150         size_t numtowrite = SVAL(req->vwv+1, 0);
 151         ssize_t nwritten;
 152         const uint8_t *data;
 153
 154         if (!fsp_is_np(fsp)) {
 155                 reply_doserror(req, ERRDOS, ERRbadfid);
 156                 return;
 157         }
 158
 159         if (fsp->vuid != req->vuid) {
 160                 reply_nterror(req, NT_STATUS_INVALID_HANDLE);
 161                 return;
 162         }
 163
 164         data = req->buf + 3;
 165
 166         if (numtowrite == 0) {
 167                 nwritten = 0;
 168         } else {
 169                 NTSTATUS status;
 170                 if (!fsp_is_np(fsp)) {
 171                         reply_nterror(req, NT_STATUS_INVALID_HANDLE);
 172                         return;
 173                 }
 174                 DEBUG(6, ("reply_pipe_write: %x name: %s len: %d\n",
 175                           (int)fsp->fnum, fsp->fsp_name, (int)numtowrite));
 176                 status = np_write(fsp->fake_file_handle, data, numtowrite,
 177                                   &nwritten);
 178                 if (!NT_STATUS_IS_OK(status)) {
 179                         reply_nterror(req, status);
 180                         return;
 181                 }
 182         }
 183
 184         if ((nwritten == 0 && numtowrite != 0) || (nwritten < 0)) {
 185                 reply_unixerror(req, ERRDOS, ERRnoaccess);
 186                 return;
 187         }
 188
 189         reply_outbuf(req, 1, 0);
 190
 191         SSVAL(req->outbuf,smb_vwv0,nwritten);
 192
 193         DEBUG(3,("write-IPC pnum=%04x nwritten=%d\n", fsp->fnum,
 194                  (int)nwritten));
 195
 196         return;
 197 }
 198
 199 /****************************************************************************
 200  Reply to a write and X.
 201
 202  This code is basically stolen from reply_write_and_X with some
 203  wrinkles to handle pipes.
 204 ****************************************************************************/
 205
 206 void reply_pipe_write_and_X(struct smb_request *req)
 207 {
 208         files_struct *fsp = file_fsp(req, SVAL(req->vwv+2, 0));
 209         size_t numtowrite = SVAL(req->vwv+10, 0);
 210         ssize_t nwritten;
 211         int smb_doff = SVAL(req->vwv+11, 0);
 212         bool pipe_start_message_raw =
 213                 ((SVAL(req->vwv+7, 0) & (PIPE_START_MESSAGE|PIPE_RAW_MODE))
 214                  == (PIPE_START_MESSAGE|PIPE_RAW_MODE));
 215         uint8_t *data;
 216
 217         if (!fsp_is_np(fsp)) {
 218                 reply_doserror(req, ERRDOS, ERRbadfid);
 219                 return;
 220         }
 221
 222         if (fsp->vuid != req->vuid) {
 223                 reply_nterror(req, NT_STATUS_INVALID_HANDLE);
 224                 return;
 225         }
 226
 227         DEBUG(6, ("reply_pipe_write_and_X: %x name: %s len: %d\n",
 228                   (int)fsp->fnum, fsp->fsp_name, (int)numtowrite));
 229
 230         data = (uint8_t *)smb_base(req->inbuf) + smb_doff;
 231
 232         if (numtowrite == 0) {
 233                 nwritten = 0;
 234         } else {
 235                 NTSTATUS status;
 236
 237                 if(pipe_start_message_raw) {
 238                         /*
 239                          * For the start of a message in named pipe byte mode,
 240                          * the first two bytes are a length-of-pdu field. Ignore
 241                          * them (we don't trust the client). JRA.
 242                          */
 243                        if(numtowrite < 2) {
 244                                 DEBUG(0,("reply_pipe_write_and_X: start of "
 245                                          "message set and not enough data "
 246                                          "sent.(%u)\n",
 247                                          (unsigned int)numtowrite ));
 248                                 reply_unixerror(req, ERRDOS, ERRnoaccess);
 249                                 return;
 250                         }
 251
 252                         data += 2;
 253                         numtowrite -= 2;
 254                 }
 255                 status = np_write(fsp->fake_file_handle, data, numtowrite,
 256                                   &nwritten);
 257                 if (!NT_STATUS_IS_OK(status)) {
 258                         reply_nterror(req, status);
 259                         return;
 260                 }
 261         }
 262
 263         if ((nwritten == 0 && numtowrite != 0) || (nwritten < 0)) {
 264                 reply_unixerror(req, ERRDOS,ERRnoaccess);
 265                 return;
 266         }
 267
 268         reply_outbuf(req, 6, 0);
 269
 270         nwritten = (pipe_start_message_raw ? nwritten + 2 : nwritten);
 271         SSVAL(req->outbuf,smb_vwv2,nwritten);
 272
 273         DEBUG(3,("writeX-IPC pnum=%04x nwritten=%d\n", fsp->fnum,
 274                  (int)nwritten));
 275
 276         chain_reply(req);
 277 }
 278
 279 /****************************************************************************
 280  Reply to a read and X.
 281  This code is basically stolen from reply_read_and_X with some
 282  wrinkles to handle pipes.
 283 ****************************************************************************/
 284
 285 void reply_pipe_read_and_X(struct smb_request *req)
 286 {
 287         files_struct *fsp = file_fsp(req, SVAL(req->vwv+0, 0));
 288         int smb_maxcnt = SVAL(req->vwv+5, 0);
 289         int smb_mincnt = SVAL(req->vwv+6, 0);
 290         ssize_t nread;
 291         uint8_t *data;
 292         bool unused;
 293         NTSTATUS status;
 294
 295         /* we don't use the offset given to use for pipe reads. This
 296            is deliberate, instead we always return the next lump of
 297            data on the pipe */
 298 #if 0
 299         uint32 smb_offs = IVAL(req->vwv+3, 0);
 300 #endif
 301
 302         if (!fsp_is_np(fsp)) {
 303                 reply_doserror(req, ERRDOS, ERRbadfid);
 304                 return;
 305         }
 306
 307         if (fsp->vuid != req->vuid) {
 308                 reply_nterror(req, NT_STATUS_INVALID_HANDLE);
 309                 return;
 310         }
 311
 312         reply_outbuf(req, 12, smb_maxcnt);
 313
 314         data = (uint8_t *)smb_buf(req->outbuf);
 315
 316         status = np_read(fsp->fake_file_handle, data, smb_maxcnt, &nread,
 317                          &unused);
 318
 319         if (!NT_STATUS_IS_OK(status)) {
 320                 reply_doserror(req, ERRDOS, ERRnoaccess);
 321                 return;
 322         }
 323
 324         srv_set_message((char *)req->outbuf, 12, nread, False);
 325
 326         SSVAL(req->outbuf,smb_vwv5,nread);
 327         SSVAL(req->outbuf,smb_vwv6,
 328               req_wct_ofs(req)
 329               + 1               /* the wct field */
 330               + 12 * sizeof(uint16_t) /* vwv */
 331               + 2);             /* the buflen field */
 332         SSVAL(req->outbuf,smb_vwv11,smb_maxcnt);
 333
 334         DEBUG(3,("readX-IPC pnum=%04x min=%d max=%d nread=%d\n",
 335                  fsp->fnum, smb_mincnt, smb_maxcnt, (int)nread));
 336
 337         chain_reply(req);
 338 }