source/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 /* PIPE/<name>/<pid>/<pnum> */
  36 #define PIPEDB_KEY_FORMAT "PIPE/%s/%u/%d"
  37
  38 struct pipe_dbrec {
  39         struct server_id pid;
  40         int pnum;
  41         uid_t uid;
  42
  43         char name[MAX_PIPE_NAME_LEN];
  44         fstring user;
  45 };
  46
  47 /****************************************************************************
  48  Reply to an open and X on a named pipe.
  49  This code is basically stolen from reply_open_and_X with some
  50  wrinkles to handle pipes.
  51 ****************************************************************************/
  52
  53 void reply_open_pipe_and_X(connection_struct *conn, struct smb_request *req)
  54 {
  55         const char *fname = NULL;
  56         char *pipe_name = NULL;
  57         smb_np_struct *p;
  58         int size=0,fmode=0,mtime=0,rmode=0;
  59         TALLOC_CTX *ctx = talloc_tos();
  60
  61         /* XXXX we need to handle passed times, sattr and flags */
  62         srvstr_pull_buf_talloc(ctx, req->inbuf, req->flags2, &pipe_name,
  63                         smb_buf(req->inbuf), STR_TERMINATE);
  64         if (!pipe_name) {
  65                 reply_botherror(req, NT_STATUS_OBJECT_NAME_NOT_FOUND,
  66                                 ERRDOS, ERRbadpipe);
  67                 return;
  68         }
  69
  70         /* If the name doesn't start \PIPE\ then this is directed */
  71         /* at a mailslot or something we really, really don't understand, */
  72         /* not just something we really don't understand. */
  73         if ( strncmp(pipe_name,PIPE,PIPELEN) != 0 ) {
  74                 reply_doserror(req, ERRSRV, ERRaccess);
  75                 return;
  76         }
  77
  78         DEBUG(4,("Opening pipe %s.\n", pipe_name));
  79
  80         /* See if it is one we want to handle. */
  81         if (!is_known_pipename(pipe_name)) {
  82                 reply_botherror(req, NT_STATUS_OBJECT_NAME_NOT_FOUND,
  83                                 ERRDOS, ERRbadpipe);
  84                 return;
  85         }
  86
  87         /* Strip \PIPE\ off the name. */
  88         fname = pipe_name + PIPELEN;
  89
  90 #if 0
  91         /*
  92          * Hack for NT printers... JRA.
  93          */
  94         if(should_fail_next_srvsvc_open(fname)) {
  95                 reply_doserror(req, ERRSRV, ERRaccess);
  96                 return;
  97         }
  98 #endif
  99
 100         /* Known pipes arrive with DIR attribs. Remove it so a regular file */
 101         /* can be opened and add it in after the open. */
 102         DEBUG(3,("Known pipe %s opening.\n",fname));
 103
 104         p = open_rpc_pipe_p(fname, conn, req->vuid);
 105         if (!p) {
 106                 reply_doserror(req, ERRSRV, ERRnofids);
 107                 return;
 108         }
 109
 110         /* Prepare the reply */
 111         reply_outbuf(req, 15, 0);
 112
 113         /* Mark the opened file as an existing named pipe in message mode. */
 114         SSVAL(req->outbuf,smb_vwv9,2);
 115         SSVAL(req->outbuf,smb_vwv10,0xc700);
 116
 117         if (rmode == 2) {
 118                 DEBUG(4,("Resetting open result to open from create.\n"));
 119                 rmode = 1;
 120         }
 121
 122         SSVAL(req->outbuf,smb_vwv2, p->pnum);
 123         SSVAL(req->outbuf,smb_vwv3,fmode);
 124         srv_put_dos_date3((char *)req->outbuf,smb_vwv4,mtime);
 125         SIVAL(req->outbuf,smb_vwv6,size);
 126         SSVAL(req->outbuf,smb_vwv8,rmode);
 127         SSVAL(req->outbuf,smb_vwv11,0x0001);
 128
 129         chain_reply(req);
 130         return;
 131 }
 132
 133 /****************************************************************************
 134  Reply to a write on a pipe.
 135 ****************************************************************************/
 136
 137 void reply_pipe_write(struct smb_request *req)
 138 {
 139         smb_np_struct *p = get_rpc_pipe_p(SVAL(req->inbuf,smb_vwv0));
 140         size_t numtowrite = SVAL(req->inbuf,smb_vwv1);
 141         int nwritten;
 142         char *data;
 143
 144         if (!p) {
 145                 reply_doserror(req, ERRDOS, ERRbadfid);
 146                 return;
 147         }
 148
 149         if (p->vuid != req->vuid) {
 150                 reply_nterror(req, NT_STATUS_INVALID_HANDLE);
 151                 return;
 152         }
 153
 154         data = smb_buf(req->inbuf) + 3;
 155
 156         if (numtowrite == 0) {
 157                 nwritten = 0;
 158         } else {
 159                 nwritten = write_to_pipe(p, data, numtowrite);
 160         }
 161
 162         if ((nwritten == 0 && numtowrite != 0) || (nwritten < 0)) {
 163                 reply_unixerror(req, ERRDOS, ERRnoaccess);
 164                 return;
 165         }
 166
 167         reply_outbuf(req, 1, 0);
 168
 169         SSVAL(req->outbuf,smb_vwv0,nwritten);
 170
 171         DEBUG(3,("write-IPC pnum=%04x nwritten=%d\n", p->pnum, nwritten));
 172
 173         return;
 174 }
 175
 176 /****************************************************************************
 177  Reply to a write and X.
 178
 179  This code is basically stolen from reply_write_and_X with some
 180  wrinkles to handle pipes.
 181 ****************************************************************************/
 182
 183 void reply_pipe_write_and_X(struct smb_request *req)
 184 {
 185         smb_np_struct *p = get_rpc_pipe_p(SVAL(req->inbuf,smb_vwv2));
 186         size_t numtowrite = SVAL(req->inbuf,smb_vwv10);
 187         int nwritten = -1;
 188         int smb_doff = SVAL(req->inbuf, smb_vwv11);
 189         bool pipe_start_message_raw =
 190                 ((SVAL(req->inbuf, smb_vwv7)
 191                   & (PIPE_START_MESSAGE|PIPE_RAW_MODE))
 192                  == (PIPE_START_MESSAGE|PIPE_RAW_MODE));
 193         char *data;
 194
 195         if (!p) {
 196                 reply_doserror(req, ERRDOS, ERRbadfid);
 197                 return;
 198         }
 199
 200         if (p->vuid != req->vuid) {
 201                 reply_nterror(req, NT_STATUS_INVALID_HANDLE);
 202                 return;
 203         }
 204
 205         data = smb_base(req->inbuf) + smb_doff;
 206
 207         if (numtowrite == 0) {
 208                 nwritten = 0;
 209         } else {
 210                 if(pipe_start_message_raw) {
 211                         /*
 212                          * For the start of a message in named pipe byte mode,
 213                          * the first two bytes are a length-of-pdu field. Ignore
 214                          * them (we don't trust the client). JRA.
 215                          */
 216                        if(numtowrite < 2) {
 217                                 DEBUG(0,("reply_pipe_write_and_X: start of "
 218                                          "message set and not enough data "
 219                                          "sent.(%u)\n",
 220                                          (unsigned int)numtowrite ));
 221                                 reply_unixerror(req, ERRDOS, ERRnoaccess);
 222                                 return;
 223                         }
 224
 225                         data += 2;
 226                         numtowrite -= 2;
 227                 }
 228                 nwritten = write_to_pipe(p, data, numtowrite);
 229         }
 230
 231         if ((nwritten == 0 && numtowrite != 0) || (nwritten < 0)) {
 232                 reply_unixerror(req, ERRDOS,ERRnoaccess);
 233                 return;
 234         }
 235
 236         reply_outbuf(req, 6, 0);
 237
 238         nwritten = (pipe_start_message_raw ? nwritten + 2 : nwritten);
 239         SSVAL(req->outbuf,smb_vwv2,nwritten);
 240
 241         DEBUG(3,("writeX-IPC pnum=%04x nwritten=%d\n", p->pnum, nwritten));
 242
 243         chain_reply(req);
 244 }
 245
 246 /****************************************************************************
 247  Reply to a read and X.
 248  This code is basically stolen from reply_read_and_X with some
 249  wrinkles to handle pipes.
 250 ****************************************************************************/
 251
 252 void reply_pipe_read_and_X(struct smb_request *req)
 253 {
 254         smb_np_struct *p = get_rpc_pipe_p(SVAL(req->inbuf,smb_vwv2));
 255         int smb_maxcnt = SVAL(req->inbuf,smb_vwv5);
 256         int smb_mincnt = SVAL(req->inbuf,smb_vwv6);
 257         int nread = -1;
 258         char *data;
 259         bool unused;
 260
 261         /* we don't use the offset given to use for pipe reads. This
 262            is deliberate, instead we always return the next lump of
 263            data on the pipe */
 264 #if 0
 265         uint32 smb_offs = IVAL(req->inbuf,smb_vwv3);
 266 #endif
 267
 268         if (!p) {
 269                 reply_doserror(req, ERRDOS, ERRbadfid);
 270                 return;
 271         }
 272
 273         reply_outbuf(req, 12, smb_maxcnt);
 274
 275         data = smb_buf(req->outbuf);
 276
 277         nread = read_from_pipe(p, data, smb_maxcnt, &unused);
 278
 279         if (nread < 0) {
 280                 reply_doserror(req, ERRDOS, ERRnoaccess);
 281                 return;
 282         }
 283
 284         srv_set_message((char *)req->outbuf, 12, nread, False);
 285
 286         SSVAL(req->outbuf,smb_vwv5,nread);
 287         SSVAL(req->outbuf,smb_vwv6,smb_offset(data,req->outbuf));
 288         SSVAL(smb_buf(req->outbuf),-2,nread);
 289
 290         DEBUG(3,("readX-IPC pnum=%04x min=%d max=%d nread=%d\n",
 291                  p->pnum, smb_mincnt, smb_maxcnt, nread));
 292
 293         chain_reply(req);
 294 }
 295
 296 /****************************************************************************
 297  Reply to a close.
 298 ****************************************************************************/
 299
 300 void reply_pipe_close(connection_struct *conn, struct smb_request *req)
 301 {
 302         smb_np_struct *p = get_rpc_pipe_p(SVAL(req->inbuf,smb_vwv0));
 303
 304         if (!p) {
 305                 reply_doserror(req, ERRDOS, ERRbadfid);
 306                 return;
 307         }
 308
 309         DEBUG(5,("reply_pipe_close: pnum:%x\n", p->pnum));
 310
 311         if (!close_rpc_pipe_hnd(p)) {
 312                 reply_doserror(req, ERRDOS, ERRbadfid);
 313                 return;
 314         }
 315
 316         /* TODO: REMOVE PIPE FROM DB */
 317
 318         reply_outbuf(req, 0, 0);
 319         return;
 320 }