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 struct tevent_req *smbd_smb2_write_send(TALLOC_CTX *mem_ctx,
  26                                                struct tevent_context *ev,
  27                                                struct smbd_smb2_request *smb2req,
  28                                                uint32_t in_smbpid,
  29                                                uint64_t in_file_id_volatile,
  30                                                DATA_BLOB in_data,
  31                                                uint64_t in_offset,
  32                                                uint32_t in_flags);
  33 static NTSTATUS smbd_smb2_write_recv(struct tevent_req *req,
  34                                      uint32_t *out_count);
  35
  36 static void smbd_smb2_request_write_done(struct tevent_req *subreq);
  37 NTSTATUS smbd_smb2_request_process_write(struct smbd_smb2_request *req)
  38 {
  39         const uint8_t *inhdr;
  40         const uint8_t *inbody;
  41         int i = req->current_idx;
  42         size_t expected_body_size = 0x31;
  43         size_t body_size;
  44         uint32_t in_smbpid;
  45         uint16_t in_data_offset;
  46         uint32_t in_data_length;
  47         DATA_BLOB in_data_buffer;
  48         uint64_t in_offset;
  49         uint64_t in_file_id_persistent;
  50         uint64_t in_file_id_volatile;
  51         uint32_t in_flags;
  52         struct tevent_req *subreq;
  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         subreq = smbd_smb2_write_send(req,
  98                                       req->conn->smb2.event_ctx,
  99                                       req,
 100                                       in_smbpid,
 101                                       in_file_id_volatile,
 102                                       in_data_buffer,
 103                                       in_offset,
 104                                       in_flags);
 105         if (subreq == NULL) {
 106                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 107         }
 108         tevent_req_set_callback(subreq, smbd_smb2_request_write_done, req);
 109         return NT_STATUS_OK;
 110 }
 111
 112 static void smbd_smb2_request_write_done(struct tevent_req *subreq)
 113 {
 114         struct smbd_smb2_request *req = tevent_req_callback_data(subreq,
 115                                         struct smbd_smb2_request);
 116         int i = req->current_idx;
 117         uint8_t *outhdr;
 118         DATA_BLOB outbody;
 119         DATA_BLOB outdyn;
 120         uint32_t out_count;
 121         NTSTATUS status;
 122         NTSTATUS error; /* transport error */
 123
 124         status = smbd_smb2_write_recv(subreq, &out_count);
 125         TALLOC_FREE(subreq);
 126         if (!NT_STATUS_IS_OK(status)) {
 127                 error = smbd_smb2_request_error(req, status);
 128                 if (!NT_STATUS_IS_OK(error)) {
 129                         smbd_server_connection_terminate(req->conn,
 130                                                          nt_errstr(error));
 131                         return;
 132                 }
 133         }
 134
 135         outhdr = (uint8_t *)req->out.vector[i].iov_base;
 136
 137         outbody = data_blob_talloc(req->out.vector, NULL, 0x10);
 138         if (outbody.data == NULL) {
 139                 error = smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 140                 if (!NT_STATUS_IS_OK(error)) {
 141                         smbd_server_connection_terminate(req->conn,
 142                                                          nt_errstr(error));
 143                         return;
 144                 }
 145         }
 146
 147         SSVAL(outbody.data, 0x00, 0x10 + 1);    /* struct size */
 148         SSVAL(outbody.data, 0x02, 0);           /* reserved */
 149         SIVAL(outbody.data, 0x04, out_count);   /* count */
 150         SIVAL(outbody.data, 0x08, 0);           /* remaining */
 151         SSVAL(outbody.data, 0x0C, 0);           /* write channel info offset */
 152         SSVAL(outbody.data, 0x0E, 0);           /* write channel info length */
 153
 154         outdyn = data_blob_const(NULL, 0);
 155
 156         error = smbd_smb2_request_done(req, outbody, &outdyn);
 157         if (!NT_STATUS_IS_OK(error)) {
 158                 smbd_server_connection_terminate(req->conn, nt_errstr(error));
 159                 return;
 160         }
 161 }
 162
 163 struct smbd_smb2_write_state {
 164         struct smbd_smb2_request *smb2req;
 165         uint32_t in_length;
 166         uint32_t out_count;
 167 };
 168
 169 static struct tevent_req *smbd_smb2_write_send(TALLOC_CTX *mem_ctx,
 170                                                struct tevent_context *ev,
 171                                                struct smbd_smb2_request *smb2req,
 172                                                uint32_t in_smbpid,
 173                                                uint64_t in_file_id_volatile,
 174                                                DATA_BLOB in_data,
 175                                                uint64_t in_offset,
 176                                                uint32_t in_flags)
 177 {
 178         NTSTATUS status;
 179         struct tevent_req *req;
 180         struct smbd_smb2_write_state *state;
 181         struct smb_request *smbreq;
 182         connection_struct *conn = smb2req->tcon->compat_conn;
 183         files_struct *fsp;
 184         ssize_t nwritten;
 185         bool write_through = false;
 186         struct lock_struct lock;
 187
 188         req = tevent_req_create(mem_ctx, &state,
 189                                 struct smbd_smb2_write_state);
 190         if (req == NULL) {
 191                 return NULL;
 192         }
 193         state->smb2req = smb2req;
 194         state->in_length = in_data.length;
 195         state->out_count = 0;
 196
 197         DEBUG(10,("smbd_smb2_write: file_id[0x%016llX]\n",
 198                   (unsigned long long)in_file_id_volatile));
 199
 200         smbreq = smbd_smb2_fake_smb_request(smb2req);
 201         if (tevent_req_nomem(smbreq, req)) {
 202                 return tevent_req_post(req, ev);
 203         }
 204
 205         fsp = file_fsp(smbreq, (uint16_t)in_file_id_volatile);
 206         if (fsp == NULL) {
 207                 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 208                 return tevent_req_post(req, ev);
 209         }
 210         if (conn != fsp->conn) {
 211                 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 212                 return tevent_req_post(req, ev);
 213         }
 214         if (smb2req->session->vuid != fsp->vuid) {
 215                 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 216                 return tevent_req_post(req, ev);
 217         }
 218
 219         if (!CHECK_WRITE(fsp)) {
 220                 tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
 221                 return tevent_req_post(req, ev);
 222         }
 223
 224         if (IS_IPC(smbreq->conn)) {
 225                 tevent_req_nterror(req, NT_STATUS_NOT_IMPLEMENTED);
 226                 return tevent_req_post(req, ev);
 227         }
 228
 229         init_strict_lock_struct(fsp,
 230                                 in_smbpid,
 231                                 in_offset,
 232                                 in_data.length,
 233                                 WRITE_LOCK,
 234                                 &lock);
 235
 236         if (!SMB_VFS_STRICT_LOCK(conn, fsp, &lock)) {
 237                 tevent_req_nterror(req, NT_STATUS_FILE_LOCK_CONFLICT);
 238                 return tevent_req_post(req, ev);
 239         }
 240
 241         nwritten = write_file(smbreq, fsp,
 242                               (const char *)in_data.data,
 243                               in_offset,
 244                               in_data.length);
 245
 246         if (((nwritten == 0) && (in_data.length != 0)) || (nwritten < 0)) {
 247                 DEBUG(5,("smbd_smb2_write: write_file[%s] disk full\n",
 248                         fsp->fsp_name));
 249                 SMB_VFS_STRICT_UNLOCK(conn, fsp, &lock);
 250                 tevent_req_nterror(req, NT_STATUS_DISK_FULL);
 251                 return tevent_req_post(req, ev);
 252         }
 253
 254         DEBUG(3,("smbd_smb2_write: fnum=[%d/%s] length=%d offset=%d wrote=%d\n",
 255                 fsp->fnum, fsp->fsp_name, (int)in_data.length,
 256                 (int)in_offset, (int)nwritten));
 257
 258         if (in_flags & 0x00000001) {
 259                 write_through = true;
 260         }
 261
 262         status = sync_file(conn, fsp, write_through);
 263         if (!NT_STATUS_IS_OK(status)) {
 264                 DEBUG(5,("smbd_smb2_write: sync_file for %s returned %s\n",
 265                         fsp->fsp_name, nt_errstr(status)));
 266                 SMB_VFS_STRICT_UNLOCK(conn, fsp, &lock);
 267                 tevent_req_nterror(req, status);
 268                 return tevent_req_post(req, ev);
 269         }
 270
 271         SMB_VFS_STRICT_UNLOCK(conn, fsp, &lock);
 272
 273         state->out_count = nwritten;
 274
 275         tevent_req_done(req);
 276         return tevent_req_post(req, ev);
 277 }
 278
 279 static NTSTATUS smbd_smb2_write_recv(struct tevent_req *req,
 280                                      uint32_t *out_count)
 281 {
 282         NTSTATUS status;
 283         struct smbd_smb2_write_state *state = tevent_req_data(req,
 284                                               struct smbd_smb2_write_state);
 285
 286         if (tevent_req_is_nterror(req, &status)) {
 287                 tevent_req_received(req);
 288                 return status;
 289         }
 290
 291         *out_count = state->out_count;
 292
 293         tevent_req_received(req);
 294         return NT_STATUS_OK;
 295 }