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 "../libcli/smb/smb_common.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 (req->compat_chain_fsp) {
  94                 /* skip check */
  95         } else if (in_file_id_persistent != 0) {
  96                 return smbd_smb2_request_error(req, NT_STATUS_FILE_CLOSED);
  97         }
  98
  99         subreq = smbd_smb2_write_send(req,
 100                                       req->sconn->smb2.event_ctx,
 101                                       req,
 102                                       in_smbpid,
 103                                       in_file_id_volatile,
 104                                       in_data_buffer,
 105                                       in_offset,
 106                                       in_flags);
 107         if (subreq == NULL) {
 108                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 109         }
 110         tevent_req_set_callback(subreq, smbd_smb2_request_write_done, req);
 111
 112         return smbd_smb2_request_pending_queue(req, subreq);
 113 }
 114
 115 static void smbd_smb2_request_write_done(struct tevent_req *subreq)
 116 {
 117         struct smbd_smb2_request *req = tevent_req_callback_data(subreq,
 118                                         struct smbd_smb2_request);
 119         int i = req->current_idx;
 120         uint8_t *outhdr;
 121         DATA_BLOB outbody;
 122         DATA_BLOB outdyn;
 123         uint32_t out_count = 0;
 124         NTSTATUS status;
 125         NTSTATUS error; /* transport error */
 126
 127         status = smbd_smb2_write_recv(subreq, &out_count);
 128         TALLOC_FREE(subreq);
 129         if (!NT_STATUS_IS_OK(status)) {
 130                 error = smbd_smb2_request_error(req, status);
 131                 if (!NT_STATUS_IS_OK(error)) {
 132                         smbd_server_connection_terminate(req->sconn,
 133                                                          nt_errstr(error));
 134                         return;
 135                 }
 136                 return;
 137         }
 138
 139         outhdr = (uint8_t *)req->out.vector[i].iov_base;
 140
 141         outbody = data_blob_talloc(req->out.vector, NULL, 0x10);
 142         if (outbody.data == NULL) {
 143                 error = smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 144                 if (!NT_STATUS_IS_OK(error)) {
 145                         smbd_server_connection_terminate(req->sconn,
 146                                                          nt_errstr(error));
 147                         return;
 148                 }
 149                 return;
 150         }
 151
 152         SSVAL(outbody.data, 0x00, 0x10 + 1);    /* struct size */
 153         SSVAL(outbody.data, 0x02, 0);           /* reserved */
 154         SIVAL(outbody.data, 0x04, out_count);   /* count */
 155         SIVAL(outbody.data, 0x08, 0);           /* remaining */
 156         SSVAL(outbody.data, 0x0C, 0);           /* write channel info offset */
 157         SSVAL(outbody.data, 0x0E, 0);           /* write channel info length */
 158
 159         outdyn = data_blob_const(NULL, 0);
 160
 161         error = smbd_smb2_request_done(req, outbody, &outdyn);
 162         if (!NT_STATUS_IS_OK(error)) {
 163                 smbd_server_connection_terminate(req->sconn, nt_errstr(error));
 164                 return;
 165         }
 166 }
 167
 168 struct smbd_smb2_write_state {
 169         struct smbd_smb2_request *smb2req;
 170         uint32_t in_length;
 171         uint32_t out_count;
 172 };
 173
 174 static void smbd_smb2_write_pipe_done(struct tevent_req *subreq);
 175
 176 static struct tevent_req *smbd_smb2_write_send(TALLOC_CTX *mem_ctx,
 177                                                struct tevent_context *ev,
 178                                                struct smbd_smb2_request *smb2req,
 179                                                uint32_t in_smbpid,
 180                                                uint64_t in_file_id_volatile,
 181                                                DATA_BLOB in_data,
 182                                                uint64_t in_offset,
 183                                                uint32_t in_flags)
 184 {
 185         NTSTATUS status;
 186         struct tevent_req *req;
 187         struct smbd_smb2_write_state *state;
 188         struct smb_request *smbreq;
 189         connection_struct *conn = smb2req->tcon->compat_conn;
 190         files_struct *fsp;
 191         ssize_t nwritten;
 192         bool write_through = false;
 193         struct lock_struct lock;
 194
 195         req = tevent_req_create(mem_ctx, &state,
 196                                 struct smbd_smb2_write_state);
 197         if (req == NULL) {
 198                 return NULL;
 199         }
 200         state->smb2req = smb2req;
 201         state->in_length = in_data.length;
 202         state->out_count = 0;
 203
 204         DEBUG(10,("smbd_smb2_write: file_id[0x%016llX]\n",
 205                   (unsigned long long)in_file_id_volatile));
 206
 207         smbreq = smbd_smb2_fake_smb_request(smb2req);
 208         if (tevent_req_nomem(smbreq, req)) {
 209                 return tevent_req_post(req, ev);
 210         }
 211
 212         fsp = file_fsp(smbreq, (uint16_t)in_file_id_volatile);
 213         if (fsp == NULL) {
 214                 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 215                 return tevent_req_post(req, ev);
 216         }
 217         if (conn != fsp->conn) {
 218                 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 219                 return tevent_req_post(req, ev);
 220         }
 221         if (smb2req->session->vuid != fsp->vuid) {
 222                 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 223                 return tevent_req_post(req, ev);
 224         }
 225
 226         if (IS_IPC(smbreq->conn)) {
 227                 struct tevent_req *subreq;
 228
 229                 if (!fsp_is_np(fsp)) {
 230                         tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 231                         return tevent_req_post(req, ev);
 232                 }
 233
 234                 subreq = np_write_send(state, smbd_event_context(),
 235                                        fsp->fake_file_handle,
 236                                        in_data.data,
 237                                        in_data.length);
 238                 if (tevent_req_nomem(subreq, req)) {
 239                         return tevent_req_post(req, ev);
 240                 }
 241                 tevent_req_set_callback(subreq,
 242                                         smbd_smb2_write_pipe_done,
 243                                         req);
 244                 return req;
 245         }
 246
 247         if (!CHECK_WRITE(fsp)) {
 248                 tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
 249                 return tevent_req_post(req, ev);
 250         }
 251
 252         init_strict_lock_struct(fsp,
 253                                 in_smbpid,
 254                                 in_offset,
 255                                 in_data.length,
 256                                 WRITE_LOCK,
 257                                 &lock);
 258
 259         if (!SMB_VFS_STRICT_LOCK(conn, fsp, &lock)) {
 260                 tevent_req_nterror(req, NT_STATUS_FILE_LOCK_CONFLICT);
 261                 return tevent_req_post(req, ev);
 262         }
 263
 264         nwritten = write_file(smbreq, fsp,
 265                               (const char *)in_data.data,
 266                               in_offset,
 267                               in_data.length);
 268
 269         if (((nwritten == 0) && (in_data.length != 0)) || (nwritten < 0)) {
 270                 DEBUG(5,("smbd_smb2_write: write_file[%s] disk full\n",
 271                          fsp_str_dbg(fsp)));
 272                 SMB_VFS_STRICT_UNLOCK(conn, fsp, &lock);
 273                 tevent_req_nterror(req, NT_STATUS_DISK_FULL);
 274                 return tevent_req_post(req, ev);
 275         }
 276
 277         DEBUG(3,("smbd_smb2_write: fnum=[%d/%s] length=%d offset=%d wrote=%d\n",
 278                 fsp->fnum, fsp_str_dbg(fsp), (int)in_data.length,
 279                 (int)in_offset, (int)nwritten));
 280
 281         if (in_flags & 0x00000001) {
 282                 write_through = true;
 283         }
 284
 285         status = sync_file(conn, fsp, write_through);
 286         if (!NT_STATUS_IS_OK(status)) {
 287                 DEBUG(5,("smbd_smb2_write: sync_file for %s returned %s\n",
 288                         fsp_str_dbg(fsp), nt_errstr(status)));
 289                 SMB_VFS_STRICT_UNLOCK(conn, fsp, &lock);
 290                 tevent_req_nterror(req, status);
 291                 return tevent_req_post(req, ev);
 292         }
 293
 294         SMB_VFS_STRICT_UNLOCK(conn, fsp, &lock);
 295
 296         state->out_count = nwritten;
 297
 298         tevent_req_done(req);
 299         return tevent_req_post(req, ev);
 300 }
 301
 302 static void smbd_smb2_write_pipe_done(struct tevent_req *subreq)
 303 {
 304         struct tevent_req *req = tevent_req_callback_data(subreq,
 305                                  struct tevent_req);
 306         struct smbd_smb2_write_state *state = tevent_req_data(req,
 307                                               struct smbd_smb2_write_state);
 308         NTSTATUS status;
 309         ssize_t nwritten = -1;
 310
 311         status = np_write_recv(subreq, &nwritten);
 312         TALLOC_FREE(subreq);
 313         if (!NT_STATUS_IS_OK(status)) {
 314                 tevent_req_nterror(req, status);
 315                 return;
 316         }
 317
 318         if ((nwritten == 0 && state->in_length != 0) || (nwritten < 0)) {
 319                 tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
 320                 return;
 321         }
 322
 323         state->out_count = nwritten;
 324
 325         tevent_req_done(req);
 326 }
 327
 328 static NTSTATUS smbd_smb2_write_recv(struct tevent_req *req,
 329                                      uint32_t *out_count)
 330 {
 331         NTSTATUS status;
 332         struct smbd_smb2_write_state *state = tevent_req_data(req,
 333                                               struct smbd_smb2_write_state);
 334
 335         if (tevent_req_is_nterror(req, &status)) {
 336                 tevent_req_received(req);
 337                 return status;
 338         }
 339
 340         *out_count = state->out_count;
 341
 342         tevent_req_received(req);
 343         return NT_STATUS_OK;
 344 }