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 > lp_smb2_max_write()) {
  82                 /* This is a warning. */
  83                 DEBUG(2,("smbd_smb2_request_process_write : "
  84                         "client ignored max write :%s: 0x%08X: 0x%08X\n",
  85                         __location__, in_data_length, lp_smb2_max_write()));
  86 #if 0
  87                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  88 #endif
  89         }
  90
  91         in_data_buffer.data = (uint8_t *)req->in.vector[i+2].iov_base;
  92         in_data_buffer.length = in_data_length;
  93
  94         if (req->compat_chain_fsp) {
  95                 /* skip check */
  96         } else if (in_file_id_persistent != in_file_id_volatile) {
  97                 return smbd_smb2_request_error(req, NT_STATUS_FILE_CLOSED);
  98         }
  99
 100         subreq = smbd_smb2_write_send(req,
 101                                       req->sconn->smb2.event_ctx,
 102                                       req,
 103                                       in_smbpid,
 104                                       in_file_id_volatile,
 105                                       in_data_buffer,
 106                                       in_offset,
 107                                       in_flags);
 108         if (subreq == NULL) {
 109                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 110         }
 111         tevent_req_set_callback(subreq, smbd_smb2_request_write_done, req);
 112
 113         return smbd_smb2_request_pending_queue(req, subreq);
 114 }
 115
 116 static void smbd_smb2_request_write_done(struct tevent_req *subreq)
 117 {
 118         struct smbd_smb2_request *req = tevent_req_callback_data(subreq,
 119                                         struct smbd_smb2_request);
 120         int i = req->current_idx;
 121         uint8_t *outhdr;
 122         DATA_BLOB outbody;
 123         DATA_BLOB outdyn;
 124         uint32_t out_count = 0;
 125         NTSTATUS status;
 126         NTSTATUS error; /* transport error */
 127
 128         status = smbd_smb2_write_recv(subreq, &out_count);
 129         TALLOC_FREE(subreq);
 130         if (!NT_STATUS_IS_OK(status)) {
 131                 error = smbd_smb2_request_error(req, status);
 132                 if (!NT_STATUS_IS_OK(error)) {
 133                         smbd_server_connection_terminate(req->sconn,
 134                                                          nt_errstr(error));
 135                         return;
 136                 }
 137                 return;
 138         }
 139
 140         outhdr = (uint8_t *)req->out.vector[i].iov_base;
 141
 142         outbody = data_blob_talloc(req->out.vector, NULL, 0x10);
 143         if (outbody.data == NULL) {
 144                 error = smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 145                 if (!NT_STATUS_IS_OK(error)) {
 146                         smbd_server_connection_terminate(req->sconn,
 147                                                          nt_errstr(error));
 148                         return;
 149                 }
 150                 return;
 151         }
 152
 153         SSVAL(outbody.data, 0x00, 0x10 + 1);    /* struct size */
 154         SSVAL(outbody.data, 0x02, 0);           /* reserved */
 155         SIVAL(outbody.data, 0x04, out_count);   /* count */
 156         SIVAL(outbody.data, 0x08, 0);           /* remaining */
 157         SSVAL(outbody.data, 0x0C, 0);           /* write channel info offset */
 158         SSVAL(outbody.data, 0x0E, 0);           /* write channel info length */
 159
 160         outdyn = data_blob_const(NULL, 0);
 161
 162         error = smbd_smb2_request_done(req, outbody, &outdyn);
 163         if (!NT_STATUS_IS_OK(error)) {
 164                 smbd_server_connection_terminate(req->sconn, nt_errstr(error));
 165                 return;
 166         }
 167 }
 168
 169 struct smbd_smb2_write_state {
 170         struct smbd_smb2_request *smb2req;
 171         files_struct *fsp;
 172         bool write_through;
 173         uint32_t in_length;
 174         uint64_t in_offset;
 175         uint32_t out_count;
 176 };
 177
 178 static void smbd_smb2_write_pipe_done(struct tevent_req *subreq);
 179
 180 NTSTATUS smb2_write_complete(struct tevent_req *req, ssize_t nwritten, int err)
 181 {
 182         NTSTATUS status;
 183         struct smbd_smb2_write_state *state = tevent_req_data(req,
 184                                         struct smbd_smb2_write_state);
 185         files_struct *fsp = state->fsp;
 186
 187         DEBUG(3,("smb2: fnum=[%d/%s] "
 188                 "length=%lu offset=%lu wrote=%lu\n",
 189                 fsp->fnum,
 190                 fsp_str_dbg(fsp),
 191                 (unsigned long)state->in_length,
 192                 (unsigned long)state->in_offset,
 193                 (unsigned long)nwritten));
 194
 195         if (nwritten == -1) {
 196                 return map_nt_error_from_unix(err);
 197         }
 198
 199         if ((nwritten == 0) && (state->in_length != 0)) {
 200                 DEBUG(5,("smb2: write [%s] disk full\n",
 201                         fsp_str_dbg(fsp)));
 202                 return NT_STATUS_DISK_FULL;
 203         }
 204
 205         status = sync_file(fsp->conn, fsp, state->write_through);
 206         if (!NT_STATUS_IS_OK(status)) {
 207                 DEBUG(5,("smb2: sync_file for %s returned %s\n",
 208                         fsp_str_dbg(fsp),
 209                         nt_errstr(status)));
 210                 return status;
 211         }
 212
 213         state->out_count = nwritten;
 214
 215         return NT_STATUS_OK;
 216 }
 217
 218 static struct tevent_req *smbd_smb2_write_send(TALLOC_CTX *mem_ctx,
 219                                                struct tevent_context *ev,
 220                                                struct smbd_smb2_request *smb2req,
 221                                                uint32_t in_smbpid,
 222                                                uint64_t in_file_id_volatile,
 223                                                DATA_BLOB in_data,
 224                                                uint64_t in_offset,
 225                                                uint32_t in_flags)
 226 {
 227         NTSTATUS status;
 228         struct tevent_req *req = NULL;
 229         struct smbd_smb2_write_state *state = NULL;
 230         struct smb_request *smbreq = NULL;
 231         connection_struct *conn = smb2req->tcon->compat_conn;
 232         files_struct *fsp = NULL;
 233         ssize_t nwritten;
 234         struct lock_struct lock;
 235
 236         req = tevent_req_create(mem_ctx, &state,
 237                                 struct smbd_smb2_write_state);
 238         if (req == NULL) {
 239                 return NULL;
 240         }
 241         state->smb2req = smb2req;
 242         if (in_flags & SMB2_WRITEFLAG_WRITE_THROUGH) {
 243                 state->write_through = true;
 244         }
 245         state->in_length = in_data.length;
 246         state->out_count = 0;
 247
 248         DEBUG(10,("smbd_smb2_write: file_id[0x%016llX]\n",
 249                   (unsigned long long)in_file_id_volatile));
 250
 251         smbreq = smbd_smb2_fake_smb_request(smb2req);
 252         if (tevent_req_nomem(smbreq, req)) {
 253                 return tevent_req_post(req, ev);
 254         }
 255
 256         fsp = file_fsp(smbreq, (uint16_t)in_file_id_volatile);
 257         if (fsp == NULL) {
 258                 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 259                 return tevent_req_post(req, ev);
 260         }
 261         if (conn != fsp->conn) {
 262                 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 263                 return tevent_req_post(req, ev);
 264         }
 265         if (smb2req->session->vuid != fsp->vuid) {
 266                 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 267                 return tevent_req_post(req, ev);
 268         }
 269
 270         state->fsp = fsp;
 271
 272         if (IS_IPC(smbreq->conn)) {
 273                 struct tevent_req *subreq = NULL;
 274
 275                 if (!fsp_is_np(fsp)) {
 276                         tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 277                         return tevent_req_post(req, ev);
 278                 }
 279
 280                 subreq = np_write_send(state, server_event_context(),
 281                                        fsp->fake_file_handle,
 282                                        in_data.data,
 283                                        in_data.length);
 284                 if (tevent_req_nomem(subreq, req)) {
 285                         return tevent_req_post(req, ev);
 286                 }
 287                 tevent_req_set_callback(subreq,
 288                                         smbd_smb2_write_pipe_done,
 289                                         req);
 290                 return req;
 291         }
 292
 293         if (!CHECK_WRITE(fsp)) {
 294                 tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
 295                 return tevent_req_post(req, ev);
 296         }
 297
 298         /* Try and do an asynchronous write. */
 299         status = schedule_aio_smb2_write(conn,
 300                                         smbreq,
 301                                         fsp,
 302                                         in_offset,
 303                                         in_data,
 304                                         state->write_through);
 305
 306         if (NT_STATUS_IS_OK(status)) {
 307                 /*
 308                  * Doing an async write. Don't
 309                  * send a "gone async" message
 310                  * as we expect this to be less
 311                  * than the client timeout period.
 312                  * JRA. FIXME for offline files..
 313                  * FIXME - add cancel code..
 314                  */
 315                 smb2req->async = true;
 316                 return req;
 317         }
 318
 319         if (!NT_STATUS_EQUAL(status, NT_STATUS_RETRY)) {
 320                 /* Real error in setting up aio. Fail. */
 321                 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 322                 return tevent_req_post(req, ev);
 323         }
 324
 325         /* Fallback to synchronous. */
 326         init_strict_lock_struct(fsp,
 327                                 in_file_id_volatile,
 328                                 in_offset,
 329                                 in_data.length,
 330                                 WRITE_LOCK,
 331                                 &lock);
 332
 333         if (!SMB_VFS_STRICT_LOCK(conn, fsp, &lock)) {
 334                 tevent_req_nterror(req, NT_STATUS_FILE_LOCK_CONFLICT);
 335                 return tevent_req_post(req, ev);
 336         }
 337
 338         nwritten = write_file(smbreq, fsp,
 339                               (const char *)in_data.data,
 340                               in_offset,
 341                               in_data.length);
 342
 343         status = smb2_write_complete(req, nwritten, errno);
 344
 345         SMB_VFS_STRICT_UNLOCK(conn, fsp, &lock);
 346
 347         DEBUG(10,("smb2: write on "
 348                 "file %s, offset %.0f, requested %u, written = %u\n",
 349                 fsp_str_dbg(fsp),
 350                 (double)in_offset,
 351                 (unsigned int)in_data.length,
 352                 (unsigned int)nwritten ));
 353
 354         if (!NT_STATUS_IS_OK(status)) {
 355                 tevent_req_nterror(req, status);
 356         } else {
 357                 /* Success. */
 358                 tevent_req_done(req);
 359         }
 360
 361         return tevent_req_post(req, ev);
 362 }
 363
 364 static void smbd_smb2_write_pipe_done(struct tevent_req *subreq)
 365 {
 366         struct tevent_req *req = tevent_req_callback_data(subreq,
 367                                  struct tevent_req);
 368         struct smbd_smb2_write_state *state = tevent_req_data(req,
 369                                               struct smbd_smb2_write_state);
 370         NTSTATUS status;
 371         ssize_t nwritten = -1;
 372
 373         status = np_write_recv(subreq, &nwritten);
 374         TALLOC_FREE(subreq);
 375         if (!NT_STATUS_IS_OK(status)) {
 376                 tevent_req_nterror(req, status);
 377                 return;
 378         }
 379
 380         if ((nwritten == 0 && state->in_length != 0) || (nwritten < 0)) {
 381                 tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
 382                 return;
 383         }
 384
 385         state->out_count = nwritten;
 386
 387         tevent_req_done(req);
 388 }
 389
 390 static NTSTATUS smbd_smb2_write_recv(struct tevent_req *req,
 391                                      uint32_t *out_count)
 392 {
 393         NTSTATUS status;
 394         struct smbd_smb2_write_state *state = tevent_req_data(req,
 395                                               struct smbd_smb2_write_state);
 396
 397         if (tevent_req_is_nterror(req, &status)) {
 398                 tevent_req_received(req);
 399                 return status;
 400         }
 401
 402         *out_count = state->out_count;
 403
 404         tevent_req_received(req);
 405         return NT_STATUS_OK;
 406 }