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/smbd.h"
  23 #include "smbd/globals.h"
  24 #include "../libcli/smb/smb_common.h"
  25 #include "../lib/util/tevent_ntstatus.h"
  26 #include "rpc_server/srv_pipe_hnd.h"
  27
  28 static struct tevent_req *smbd_smb2_write_send(TALLOC_CTX *mem_ctx,
  29                                                struct tevent_context *ev,
  30                                                struct smbd_smb2_request *smb2req,
  31                                                uint32_t in_smbpid,
  32                                                uint64_t in_file_id_volatile,
  33                                                DATA_BLOB in_data,
  34                                                uint64_t in_offset,
  35                                                uint32_t in_flags);
  36 static NTSTATUS smbd_smb2_write_recv(struct tevent_req *req,
  37                                      uint32_t *out_count);
  38
  39 static void smbd_smb2_request_write_done(struct tevent_req *subreq);
  40 NTSTATUS smbd_smb2_request_process_write(struct smbd_smb2_request *req)
  41 {
  42         NTSTATUS status;
  43         const uint8_t *inhdr;
  44         const uint8_t *inbody;
  45         int i = req->current_idx;
  46         uint32_t in_smbpid;
  47         uint16_t in_data_offset;
  48         uint32_t in_data_length;
  49         DATA_BLOB in_data_buffer;
  50         uint64_t in_offset;
  51         uint64_t in_file_id_persistent;
  52         uint64_t in_file_id_volatile;
  53         uint32_t in_flags;
  54         struct tevent_req *subreq;
  55
  56         status = smbd_smb2_request_verify_sizes(req, 0x31);
  57         if (!NT_STATUS_IS_OK(status)) {
  58                 return smbd_smb2_request_error(req, status);
  59         }
  60         inhdr = (const uint8_t *)req->in.vector[i+0].iov_base;
  61         inbody = (const uint8_t *)req->in.vector[i+1].iov_base;
  62
  63         in_smbpid = IVAL(inhdr, SMB2_HDR_PID);
  64
  65         in_data_offset          = SVAL(inbody, 0x02);
  66         in_data_length          = IVAL(inbody, 0x04);
  67         in_offset               = BVAL(inbody, 0x08);
  68         in_file_id_persistent   = BVAL(inbody, 0x10);
  69         in_file_id_volatile     = BVAL(inbody, 0x18);
  70         in_flags                = IVAL(inbody, 0x2C);
  71
  72         if (in_data_offset != (SMB2_HDR_BODY + req->in.vector[i+1].iov_len)) {
  73                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  74         }
  75
  76         if (in_data_length > req->in.vector[i+2].iov_len) {
  77                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  78         }
  79
  80         /* check the max write size */
  81         if (in_data_length > req->sconn->smb2.max_write) {
  82                 DEBUG(2,("smbd_smb2_request_process_write : "
  83                         "client ignored max write :%s: 0x%08X: 0x%08X\n",
  84                         __location__, in_data_length, req->sconn->smb2.max_write));
  85 #if 0
  86                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  87 #endif
  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 != in_file_id_volatile) {
  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         files_struct *fsp;
 171         bool write_through;
 172         uint32_t in_length;
 173         uint64_t in_offset;
 174         uint32_t out_count;
 175 };
 176
 177 static void smbd_smb2_write_pipe_done(struct tevent_req *subreq);
 178
 179 NTSTATUS smb2_write_complete(struct tevent_req *req, ssize_t nwritten, int err)
 180 {
 181         NTSTATUS status;
 182         struct smbd_smb2_write_state *state = tevent_req_data(req,
 183                                         struct smbd_smb2_write_state);
 184         files_struct *fsp = state->fsp;
 185
 186         DEBUG(3,("smb2: fnum=[%d/%s] "
 187                 "length=%lu offset=%lu wrote=%lu\n",
 188                 fsp->fnum,
 189                 fsp_str_dbg(fsp),
 190                 (unsigned long)state->in_length,
 191                 (unsigned long)state->in_offset,
 192                 (unsigned long)nwritten));
 193
 194         if (nwritten == -1) {
 195                 return map_nt_error_from_unix(err);
 196         }
 197
 198         if ((nwritten == 0) && (state->in_length != 0)) {
 199                 DEBUG(5,("smb2: write [%s] disk full\n",
 200                         fsp_str_dbg(fsp)));
 201                 return NT_STATUS_DISK_FULL;
 202         }
 203
 204         status = sync_file(fsp->conn, fsp, state->write_through);
 205         if (!NT_STATUS_IS_OK(status)) {
 206                 DEBUG(5,("smb2: sync_file for %s returned %s\n",
 207                         fsp_str_dbg(fsp),
 208                         nt_errstr(status)));
 209                 return status;
 210         }
 211
 212         state->out_count = nwritten;
 213
 214         return NT_STATUS_OK;
 215 }
 216
 217 static struct tevent_req *smbd_smb2_write_send(TALLOC_CTX *mem_ctx,
 218                                                struct tevent_context *ev,
 219                                                struct smbd_smb2_request *smb2req,
 220                                                uint32_t in_smbpid,
 221                                                uint64_t in_file_id_volatile,
 222                                                DATA_BLOB in_data,
 223                                                uint64_t in_offset,
 224                                                uint32_t in_flags)
 225 {
 226         NTSTATUS status;
 227         struct tevent_req *req = NULL;
 228         struct smbd_smb2_write_state *state = NULL;
 229         struct smb_request *smbreq = NULL;
 230         connection_struct *conn = smb2req->tcon->compat_conn;
 231         files_struct *fsp = NULL;
 232         ssize_t nwritten;
 233         struct lock_struct lock;
 234
 235         req = tevent_req_create(mem_ctx, &state,
 236                                 struct smbd_smb2_write_state);
 237         if (req == NULL) {
 238                 return NULL;
 239         }
 240         state->smb2req = smb2req;
 241         if (in_flags & 0x00000001) {
 242                 state->write_through = true;
 243         }
 244         state->in_length = in_data.length;
 245         state->out_count = 0;
 246
 247         DEBUG(10,("smbd_smb2_write: file_id[0x%016llX]\n",
 248                   (unsigned long long)in_file_id_volatile));
 249
 250         smbreq = smbd_smb2_fake_smb_request(smb2req);
 251         if (tevent_req_nomem(smbreq, req)) {
 252                 return tevent_req_post(req, ev);
 253         }
 254
 255         fsp = file_fsp(smbreq, (uint16_t)in_file_id_volatile);
 256         if (fsp == NULL) {
 257                 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 258                 return tevent_req_post(req, ev);
 259         }
 260         if (conn != fsp->conn) {
 261                 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 262                 return tevent_req_post(req, ev);
 263         }
 264         if (smb2req->session->vuid != fsp->vuid) {
 265                 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 266                 return tevent_req_post(req, ev);
 267         }
 268
 269         state->fsp = fsp;
 270
 271         if (IS_IPC(smbreq->conn)) {
 272                 struct tevent_req *subreq = NULL;
 273
 274                 if (!fsp_is_np(fsp)) {
 275                         tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 276                         return tevent_req_post(req, ev);
 277                 }
 278
 279                 subreq = np_write_send(state, smbd_event_context(),
 280                                        fsp->fake_file_handle,
 281                                        in_data.data,
 282                                        in_data.length);
 283                 if (tevent_req_nomem(subreq, req)) {
 284                         return tevent_req_post(req, ev);
 285                 }
 286                 tevent_req_set_callback(subreq,
 287                                         smbd_smb2_write_pipe_done,
 288                                         req);
 289                 return req;
 290         }
 291
 292         if (!CHECK_WRITE(fsp)) {
 293                 tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
 294                 return tevent_req_post(req, ev);
 295         }
 296
 297         /* Try and do an asynchronous write. */
 298         status = schedule_aio_smb2_write(conn,
 299                                         smbreq,
 300                                         fsp,
 301                                         in_offset,
 302                                         in_data,
 303                                         state->write_through);
 304
 305         if (NT_STATUS_IS_OK(status)) {
 306                 /*
 307                  * Doing an async write. Don't
 308                  * send a "gone async" message
 309                  * as we expect this to be less
 310                  * than the client timeout period.
 311                  * JRA. FIXME for offline files..
 312                  * FIXME - add cancel code..
 313                  */
 314                 smb2req->async = true;
 315                 return req;
 316         }
 317
 318         if (!NT_STATUS_EQUAL(status, NT_STATUS_RETRY)) {
 319                 /* Real error in setting up aio. Fail. */
 320                 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 321                 return tevent_req_post(req, ev);
 322         }
 323
 324         /* Fallback to synchronous. */
 325         init_strict_lock_struct(fsp,
 326                                 in_file_id_volatile,
 327                                 in_offset,
 328                                 in_data.length,
 329                                 WRITE_LOCK,
 330                                 &lock);
 331
 332         if (!SMB_VFS_STRICT_LOCK(conn, fsp, &lock)) {
 333                 tevent_req_nterror(req, NT_STATUS_FILE_LOCK_CONFLICT);
 334                 return tevent_req_post(req, ev);
 335         }
 336
 337         nwritten = write_file(smbreq, fsp,
 338                               (const char *)in_data.data,
 339                               in_offset,
 340                               in_data.length);
 341
 342         status = smb2_write_complete(req, nwritten, errno);
 343
 344         SMB_VFS_STRICT_UNLOCK(conn, fsp, &lock);
 345
 346         DEBUG(10,("smb2: write on "
 347                 "file %s, offset %.0f, requested %u, written = %u\n",
 348                 fsp_str_dbg(fsp),
 349                 (double)in_offset,
 350                 (unsigned int)in_data.length,
 351                 (unsigned int)nwritten ));
 352
 353         if (!NT_STATUS_IS_OK(status)) {
 354                 tevent_req_nterror(req, status);
 355         } else {
 356                 /* Success. */
 357                 tevent_req_done(req);
 358         }
 359
 360         return tevent_req_post(req, ev);
 361 }
 362
 363 static void smbd_smb2_write_pipe_done(struct tevent_req *subreq)
 364 {
 365         struct tevent_req *req = tevent_req_callback_data(subreq,
 366                                  struct tevent_req);
 367         struct smbd_smb2_write_state *state = tevent_req_data(req,
 368                                               struct smbd_smb2_write_state);
 369         NTSTATUS status;
 370         ssize_t nwritten = -1;
 371
 372         status = np_write_recv(subreq, &nwritten);
 373         TALLOC_FREE(subreq);
 374         if (!NT_STATUS_IS_OK(status)) {
 375                 tevent_req_nterror(req, status);
 376                 return;
 377         }
 378
 379         if ((nwritten == 0 && state->in_length != 0) || (nwritten < 0)) {
 380                 tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
 381                 return;
 382         }
 383
 384         state->out_count = nwritten;
 385
 386         tevent_req_done(req);
 387 }
 388
 389 static NTSTATUS smbd_smb2_write_recv(struct tevent_req *req,
 390                                      uint32_t *out_count)
 391 {
 392         NTSTATUS status;
 393         struct smbd_smb2_write_state *state = tevent_req_data(req,
 394                                               struct smbd_smb2_write_state);
 395
 396         if (tevent_req_is_nterror(req, &status)) {
 397                 tevent_req_received(req);
 398                 return status;
 399         }
 400
 401         *out_count = state->out_count;
 402
 403         tevent_req_received(req);
 404         return NT_STATUS_OK;
 405 }