source3/smbd/smb2_write.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/globals.h"
  23 #include "../source4/libcli/smb2/smb2_constants.h"
  24
  25 static NTSTATUS smbd_smb2_write(struct smbd_smb2_request *req,
  26                                 uint32_t in_smbpid,
  27                                 uint64_t in_file_id_volatile,
  28                                 DATA_BLOB in_data,
  29                                 uint64_t in_offset,
  30                                 uint32_t in_flags,
  31                                 uint32_t *out_count);
  32
  33 NTSTATUS smbd_smb2_request_process_write(struct smbd_smb2_request *req)
  34 {
  35         const uint8_t *inhdr;
  36         const uint8_t *inbody;
  37         int i = req->current_idx;
  38         uint8_t *outhdr;
  39         DATA_BLOB outbody;
  40         DATA_BLOB outdyn;
  41         size_t expected_body_size = 0x31;
  42         size_t body_size;
  43         uint32_t in_smbpid;
  44         uint16_t in_data_offset;
  45         uint32_t in_data_length;
  46         DATA_BLOB in_data_buffer;
  47         uint64_t in_offset;
  48         uint64_t in_file_id_persistent;
  49         uint64_t in_file_id_volatile;
  50         uint32_t in_flags;
  51         uint32_t out_count;
  52         NTSTATUS status;
  53
  54         inhdr = (const uint8_t *)req->in.vector[i+0].iov_base;
  55         if (req->in.vector[i+1].iov_len != (expected_body_size & 0xFFFFFFFE)) {
  56                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  57         }
  58
  59         inbody = (const uint8_t *)req->in.vector[i+1].iov_base;
  60
  61         body_size = SVAL(inbody, 0x00);
  62         if (body_size != expected_body_size) {
  63                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  64         }
  65
  66         in_smbpid = IVAL(inhdr, SMB2_HDR_PID);
  67
  68         in_data_offset          = SVAL(inbody, 0x02);
  69         in_data_length          = IVAL(inbody, 0x04);
  70         in_offset               = BVAL(inbody, 0x08);
  71         in_file_id_persistent   = BVAL(inbody, 0x10);
  72         in_file_id_volatile     = BVAL(inbody, 0x18);
  73         in_flags                = IVAL(inbody, 0x2C);
  74
  75         if (in_data_offset != (SMB2_HDR_BODY + (body_size & 0xFFFFFFFE))) {
  76                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  77         }
  78
  79         if (in_data_length > req->in.vector[i+2].iov_len) {
  80                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  81         }
  82
  83         /* check the max write size */
  84         if (in_data_length > 0x00010000) {
  85                 DEBUG(0,("here:%s: 0x%08X: 0x%08X\n",
  86                         __location__, in_data_length, 0x00010000));
  87                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  88         }
  89
  90         in_data_buffer.data = (uint8_t *)req->in.vector[i+2].iov_base;
  91         in_data_buffer.length = in_data_length;
  92
  93         if (in_file_id_persistent != 0) {
  94                 return smbd_smb2_request_error(req, NT_STATUS_FILE_CLOSED);
  95         }
  96
  97         status = smbd_smb2_write(req,
  98                                  in_smbpid,
  99                                  in_file_id_volatile,
 100                                  in_data_buffer,
 101                                  in_offset,
 102                                  in_flags,
 103                                  &out_count);
 104         if (!NT_STATUS_IS_OK(status)) {
 105                 return smbd_smb2_request_error(req, status);
 106         }
 107
 108         outhdr = (uint8_t *)req->out.vector[i].iov_base;
 109
 110         outbody = data_blob_talloc(req->out.vector, NULL, 0x10);
 111         if (outbody.data == NULL) {
 112                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 113         }
 114
 115         SSVAL(outbody.data, 0x00, 0x10 + 1);    /* struct size */
 116         SSVAL(outbody.data, 0x02, 0);           /* reserved */
 117         SIVAL(outbody.data, 0x04, out_count);   /* count */
 118         SIVAL(outbody.data, 0x08, 0);           /* remaining */
 119         SSVAL(outbody.data, 0x0C, 0);           /* write channel info offset */
 120         SSVAL(outbody.data, 0x0E, 0);           /* write channel info length */
 121
 122         outdyn = data_blob_const(NULL, 0);
 123
 124         return smbd_smb2_request_done(req, outbody, &outdyn);
 125 }
 126
 127 static NTSTATUS smbd_smb2_write(struct smbd_smb2_request *req,
 128                                 uint32_t in_smbpid,
 129                                 uint64_t in_file_id_volatile,
 130                                 DATA_BLOB in_data,
 131                                 uint64_t in_offset,
 132                                 uint32_t in_flags,
 133                                 uint32_t *out_count)
 134 {
 135         NTSTATUS status;
 136         struct smb_request *smbreq;
 137         connection_struct *conn = req->tcon->compat_conn;
 138         files_struct *fsp;
 139         ssize_t nwritten;
 140         bool write_through = false;
 141         struct lock_struct lock;
 142
 143         DEBUG(10,("smbd_smb2_write: file_id[0x%016llX]\n",
 144                   (unsigned long long)in_file_id_volatile));
 145
 146         smbreq = smbd_smb2_fake_smb_request(req);
 147         if (smbreq == NULL) {
 148                 return NT_STATUS_NO_MEMORY;
 149         }
 150
 151         /* If it's an IPC, pass off the pipe handler. */
 152         if (IS_IPC(conn)) {
 153                 return NT_STATUS_NOT_IMPLEMENTED;
 154         }
 155
 156         fsp = file_fsp(smbreq, (uint16_t)in_file_id_volatile);
 157         if (fsp == NULL) {
 158                 return NT_STATUS_FILE_CLOSED;
 159         }
 160         if (conn != fsp->conn) {
 161                 return NT_STATUS_FILE_CLOSED;
 162         }
 163         if (req->session->vuid != fsp->vuid) {
 164                 return NT_STATUS_FILE_CLOSED;
 165         }
 166
 167         if (!CHECK_WRITE(fsp)) {
 168                 return NT_STATUS_ACCESS_DENIED;
 169         }
 170
 171         init_strict_lock_struct(fsp,
 172                                 in_smbpid,
 173                                 in_offset,
 174                                 in_data.length,
 175                                 WRITE_LOCK,
 176                                 &lock);
 177
 178         if (!SMB_VFS_STRICT_LOCK(conn, fsp, &lock)) {
 179                 return NT_STATUS_FILE_LOCK_CONFLICT;
 180         }
 181
 182         nwritten = write_file(smbreq, fsp,
 183                               (const char *)in_data.data,
 184                               in_offset,
 185                               in_data.length);
 186
 187         if (((nwritten == 0) && (in_data.length != 0)) || (nwritten < 0)) {
 188                 DEBUG(5,("smbd_smb2_write: write_file[%s] disk full\n",
 189                         fsp->fsp_name));
 190                 SMB_VFS_STRICT_UNLOCK(conn, fsp, &lock);
 191                 return NT_STATUS_DISK_FULL;
 192         }
 193
 194         DEBUG(3,("smbd_smb2_write: fnum=[%d/%s] length=%d offset=%d wrote=%d\n",
 195                 fsp->fnum, fsp->fsp_name, (int)in_data.length,
 196                 (int)in_offset, (int)nwritten));
 197
 198         if (in_flags & 0x00000001) {
 199                 write_through = true;
 200         }
 201
 202         status = sync_file(conn, fsp, write_through);
 203         if (!NT_STATUS_IS_OK(status)) {
 204                 DEBUG(5,("smbd_smb2_write: sync_file for %s returned %s\n",
 205                         fsp->fsp_name, nt_errstr(status)));
 206                 SMB_VFS_STRICT_UNLOCK(conn, fsp, &lock);
 207                 return status;
 208         }
 209
 210         SMB_VFS_STRICT_UNLOCK(conn, fsp, &lock);
 211
 212         return NT_STATUS_OK;
 213 }