source3/smbd/smb2_glue.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Core SMB2 server
   4
   5    Copyright (C) Stefan Metzmacher 2009
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19 */
  20
  21 #include "includes.h"
  22 #include "smbd/smbd.h"
  23 #include "smbd/globals.h"
  24 #include "../libcli/smb/smb_common.h"
  25
  26 struct smb_request *smbd_smb2_fake_smb_request(struct smbd_smb2_request *req)
  27 {
  28         struct smb_request *smbreq;
  29         const uint8_t *inhdr = SMBD_SMB2_IN_HDR_PTR(req);
  30
  31         if (req->smb1req) {
  32                 smbreq = req->smb1req;
  33         } else {
  34                 smbreq = talloc_zero(req, struct smb_request);
  35                 if (smbreq == NULL) {
  36                         return NULL;
  37                 }
  38         }
  39
  40         smbreq->request_time = req->request_time;
  41         smbreq->vuid = req->session->compat->vuid;
  42         smbreq->tid = req->tcon->compat->cnum;
  43         smbreq->conn = req->tcon->compat;
  44         smbreq->sconn = req->sconn;
  45         smbreq->xconn = req->xconn;
  46         smbreq->smbpid = (uint16_t)IVAL(inhdr, SMB2_HDR_PID);
  47         smbreq->flags2 = FLAGS2_UNICODE_STRINGS |
  48                          FLAGS2_32_BIT_ERROR_CODES |
  49                          FLAGS2_LONG_PATH_COMPONENTS |
  50                          FLAGS2_IS_LONG_NAME;
  51
  52         /* This is not documented in revision 49 of [MS-SMB2] but should be
  53          * added in a later revision (and torture test smb2.read.access
  54          * as well as smb2.ioctl_copy_chunk_bad_access against
  55          * Server 2012R2 confirms this)
  56          *
  57          * If FILE_EXECUTE is granted to a handle then the SMB2 server
  58          * acts as if FILE_READ_DATA has also been granted. We must still
  59          * keep the original granted mask, because with ioctl requests,
  60          * access checks are made on the file handle, "below" the SMB2
  61          * server, and the object store below the SMB layer is not aware
  62          * of this arrangement (see smb2.ioctl.copy_chunk_bad_access
  63          * torture test).
  64          */
  65         smbreq->flags2 |= FLAGS2_READ_PERMIT_EXECUTE;
  66
  67         if (IVAL(inhdr, SMB2_HDR_FLAGS) & SMB2_HDR_FLAG_DFS) {
  68                 smbreq->flags2 |= FLAGS2_DFS_PATHNAMES;
  69         }
  70         smbreq->mid = BVAL(inhdr, SMB2_HDR_MESSAGE_ID);
  71         smbreq->chain_fsp = req->compat_chain_fsp;
  72         smbreq->smb2req = req;
  73         req->smb1req = smbreq;
  74
  75         return smbreq;
  76 }
  77
  78 /*********************************************************
  79  Are there unread bytes for recvfile ?
  80 *********************************************************/
  81
  82 size_t smbd_smb2_unread_bytes(struct smbd_smb2_request *req)
  83 {
  84         if (req->smb1req) {
  85                 return req->smb1req->unread_bytes;
  86         }
  87         return 0;
  88 }
  89
  90 /*********************************************************
  91  Called from file_free() to remove any chained fsp pointers.
  92 *********************************************************/
  93
  94 void remove_smb2_chained_fsp(files_struct *fsp)
  95 {
  96         struct smbd_server_connection *sconn = fsp->conn->sconn;
  97         struct smbXsrv_connection *xconn = NULL;
  98
  99         if (sconn->client != NULL) {
 100                 xconn = sconn->client->connections;
 101         }
 102
 103         for (; xconn != NULL; xconn = xconn->next) {
 104                 struct smbd_smb2_request *smb2req;
 105
 106                 for (smb2req = xconn->smb2.requests; smb2req; smb2req = smb2req->next) {
 107                         if (smb2req->compat_chain_fsp == fsp) {
 108                                 smb2req->compat_chain_fsp = NULL;
 109                         }
 110                         if (smb2req->smb1req && smb2req->smb1req->chain_fsp == fsp) {
 111                                 smb2req->smb1req->chain_fsp = NULL;
 112                         }
 113                 }
 114         }
 115 }