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 > lp_smb2_max_write()) {
  85                 /* This is a warning. */
  86                 DEBUG(2,("smbd_smb2_request_process_write : "
  87                         "client ignored max write :%s: 0x%08X: 0x%08X\n",
  88                         __location__, in_data_length, lp_smb2_max_write()));
  89 #if 0
  90                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  91 #endif
  92         }
  93
  94         in_data_buffer.data = (uint8_t *)req->in.vector[i+2].iov_base;
  95         in_data_buffer.length = in_data_length;
  96
  97         if (req->compat_chain_fsp) {
  98                 /* skip check */
  99         } else if (in_file_id_persistent != in_file_id_volatile) {
 100                 return smbd_smb2_request_error(req, NT_STATUS_FILE_CLOSED);
 101         }
 102
 103         subreq = smbd_smb2_write_send(req,
 104                                       req->sconn->smb2.event_ctx,
 105                                       req,
 106                                       in_smbpid,
 107                                       in_file_id_volatile,
 108                                       in_data_buffer,
 109                                       in_offset,
 110                                       in_flags);
 111         if (subreq == NULL) {
 112                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 113         }
 114         tevent_req_set_callback(subreq, smbd_smb2_request_write_done, req);
 115
 116         return smbd_smb2_request_pending_queue(req, subreq);
 117 }
 118
 119 static void smbd_smb2_request_write_done(struct tevent_req *subreq)
 120 {
 121         struct smbd_smb2_request *req = tevent_req_callback_data(subreq,
 122                                         struct smbd_smb2_request);
 123         int i = req->current_idx;
 124         uint8_t *outhdr;
 125         DATA_BLOB outbody;
 126         DATA_BLOB outdyn;
 127         uint32_t out_count = 0;
 128         NTSTATUS status;
 129         NTSTATUS error; /* transport error */
 130
 131         status = smbd_smb2_write_recv(subreq, &out_count);
 132         TALLOC_FREE(subreq);
 133         if (!NT_STATUS_IS_OK(status)) {
 134                 error = smbd_smb2_request_error(req, status);
 135                 if (!NT_STATUS_IS_OK(error)) {
 136                         smbd_server_connection_terminate(req->sconn,
 137                                                          nt_errstr(error));
 138                         return;
 139                 }
 140                 return;
 141         }
 142
 143         outhdr = (uint8_t *)req->out.vector[i].iov_base;
 144
 145         outbody = data_blob_talloc(req->out.vector, NULL, 0x10);
 146         if (outbody.data == NULL) {
 147                 error = smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 148                 if (!NT_STATUS_IS_OK(error)) {
 149                         smbd_server_connection_terminate(req->sconn,
 150                                                          nt_errstr(error));
 151                         return;
 152                 }
 153                 return;
 154         }
 155
 156         SSVAL(outbody.data, 0x00, 0x10 + 1);    /* struct size */
 157         SSVAL(outbody.data, 0x02, 0);           /* reserved */
 158         SIVAL(outbody.data, 0x04, out_count);   /* count */
 159         SIVAL(outbody.data, 0x08, 0);           /* remaining */
 160         SSVAL(outbody.data, 0x0C, 0);           /* write channel info offset */
 161         SSVAL(outbody.data, 0x0E, 0);           /* write channel info length */
 162
 163         outdyn = data_blob_const(NULL, 0);
 164
 165         error = smbd_smb2_request_done(req, outbody, &outdyn);
 166         if (!NT_STATUS_IS_OK(error)) {
 167                 smbd_server_connection_terminate(req->sconn, nt_errstr(error));
 168                 return;
 169         }
 170 }
 171
 172 struct smbd_smb2_write_state {
 173         struct smbd_smb2_request *smb2req;
 174         uint32_t in_length;
 175         uint32_t out_count;
 176 };
 177
 178 static void smbd_smb2_write_pipe_done(struct tevent_req *subreq);
 179
 180 static struct tevent_req *smbd_smb2_write_send(TALLOC_CTX *mem_ctx,
 181                                                struct tevent_context *ev,
 182                                                struct smbd_smb2_request *smb2req,
 183                                                uint32_t in_smbpid,
 184                                                uint64_t in_file_id_volatile,
 185                                                DATA_BLOB in_data,
 186                                                uint64_t in_offset,
 187                                                uint32_t in_flags)
 188 {
 189         NTSTATUS status;
 190         struct tevent_req *req;
 191         struct smbd_smb2_write_state *state;
 192         struct smb_request *smbreq;
 193         connection_struct *conn = smb2req->tcon->compat_conn;
 194         files_struct *fsp;
 195         ssize_t nwritten;
 196         bool write_through = false;
 197         struct lock_struct lock;
 198
 199         req = tevent_req_create(mem_ctx, &state,
 200                                 struct smbd_smb2_write_state);
 201         if (req == NULL) {
 202                 return NULL;
 203         }
 204         state->smb2req = smb2req;
 205         state->in_length = in_data.length;
 206         state->out_count = 0;
 207
 208         DEBUG(10,("smbd_smb2_write: file_id[0x%016llX]\n",
 209                   (unsigned long long)in_file_id_volatile));
 210
 211         smbreq = smbd_smb2_fake_smb_request(smb2req);
 212         if (tevent_req_nomem(smbreq, req)) {
 213                 return tevent_req_post(req, ev);
 214         }
 215
 216         fsp = file_fsp(smbreq, (uint16_t)in_file_id_volatile);
 217         if (fsp == NULL) {
 218                 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 219                 return tevent_req_post(req, ev);
 220         }
 221         if (conn != fsp->conn) {
 222                 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 223                 return tevent_req_post(req, ev);
 224         }
 225         if (smb2req->session->vuid != fsp->vuid) {
 226                 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 227                 return tevent_req_post(req, ev);
 228         }
 229
 230         if (IS_IPC(smbreq->conn)) {
 231                 struct tevent_req *subreq;
 232
 233                 if (!fsp_is_np(fsp)) {
 234                         tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 235                         return tevent_req_post(req, ev);
 236                 }
 237
 238                 subreq = np_write_send(state, smbd_event_context(),
 239                                        fsp->fake_file_handle,
 240                                        in_data.data,
 241                                        in_data.length);
 242                 if (tevent_req_nomem(subreq, req)) {
 243                         return tevent_req_post(req, ev);
 244                 }
 245                 tevent_req_set_callback(subreq,
 246                                         smbd_smb2_write_pipe_done,
 247                                         req);
 248                 return req;
 249         }
 250
 251         if (!CHECK_WRITE(fsp)) {
 252                 tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
 253                 return tevent_req_post(req, ev);
 254         }
 255
 256         init_strict_lock_struct(fsp,
 257                                 in_file_id_volatile,
 258                                 in_offset,
 259                                 in_data.length,
 260                                 WRITE_LOCK,
 261                                 &lock);
 262
 263         if (!SMB_VFS_STRICT_LOCK(conn, fsp, &lock)) {
 264                 tevent_req_nterror(req, NT_STATUS_FILE_LOCK_CONFLICT);
 265                 return tevent_req_post(req, ev);
 266         }
 267
 268         nwritten = write_file(smbreq, fsp,
 269                               (const char *)in_data.data,
 270                               in_offset,
 271                               in_data.length);
 272
 273
 274         DEBUG(10,("smbd_smb2_write: file %s handle [0x%016llX] offset=%llu "
 275                 "len=%llu returned %lld\n",
 276                 fsp_str_dbg(fsp),
 277                 (unsigned long long)in_file_id_volatile,
 278                 (unsigned long long)in_offset,
 279                 (unsigned long long)in_data.length,
 280                 (long long)nwritten));
 281
 282         if (((nwritten == 0) && (in_data.length != 0)) || (nwritten < 0)) {
 283                 DEBUG(5,("smbd_smb2_write: write_file[%s] disk full\n",
 284                          fsp_str_dbg(fsp)));
 285                 SMB_VFS_STRICT_UNLOCK(conn, fsp, &lock);
 286                 tevent_req_nterror(req, NT_STATUS_DISK_FULL);
 287                 return tevent_req_post(req, ev);
 288         }
 289
 290         DEBUG(3,("smbd_smb2_write: fnum=[%d/%s] length=%lu offset=%lu wrote=%lu\n",
 291                 fsp->fnum, fsp_str_dbg(fsp),
 292                 (unsigned long)in_data.length,
 293                 (unsigned long)in_offset,
 294                 (unsigned long)nwritten));
 295
 296         if (in_flags & 0x00000001) {
 297                 write_through = true;
 298         }
 299
 300         status = sync_file(conn, fsp, write_through);
 301         if (!NT_STATUS_IS_OK(status)) {
 302                 DEBUG(5,("smbd_smb2_write: sync_file for %s returned %s\n",
 303                         fsp_str_dbg(fsp), nt_errstr(status)));
 304                 SMB_VFS_STRICT_UNLOCK(conn, fsp, &lock);
 305                 tevent_req_nterror(req, status);
 306                 return tevent_req_post(req, ev);
 307         }
 308
 309         SMB_VFS_STRICT_UNLOCK(conn, fsp, &lock);
 310
 311         state->out_count = nwritten;
 312
 313         tevent_req_done(req);
 314         return tevent_req_post(req, ev);
 315 }
 316
 317 static void smbd_smb2_write_pipe_done(struct tevent_req *subreq)
 318 {
 319         struct tevent_req *req = tevent_req_callback_data(subreq,
 320                                  struct tevent_req);
 321         struct smbd_smb2_write_state *state = tevent_req_data(req,
 322                                               struct smbd_smb2_write_state);
 323         NTSTATUS status;
 324         ssize_t nwritten = -1;
 325
 326         status = np_write_recv(subreq, &nwritten);
 327         TALLOC_FREE(subreq);
 328         if (!NT_STATUS_IS_OK(status)) {
 329                 tevent_req_nterror(req, status);
 330                 return;
 331         }
 332
 333         if ((nwritten == 0 && state->in_length != 0) || (nwritten < 0)) {
 334                 tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
 335                 return;
 336         }
 337
 338         state->out_count = nwritten;
 339
 340         tevent_req_done(req);
 341 }
 342
 343 static NTSTATUS smbd_smb2_write_recv(struct tevent_req *req,
 344                                      uint32_t *out_count)
 345 {
 346         NTSTATUS status;
 347         struct smbd_smb2_write_state *state = tevent_req_data(req,
 348                                               struct smbd_smb2_write_state);
 349
 350         if (tevent_req_is_nterror(req, &status)) {
 351                 tevent_req_received(req);
 352                 return status;
 353         }
 354
 355         *out_count = state->out_count;
 356
 357         tevent_req_received(req);
 358         return NT_STATUS_OK;
 359 }