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                                                struct files_struct *in_fsp,
  32                                                uint32_t in_smbpid,
  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         struct files_struct *in_fsp;
  54         uint32_t in_flags;
  55         struct tevent_req *subreq;
  56
  57         status = smbd_smb2_request_verify_sizes(req, 0x31);
  58         if (!NT_STATUS_IS_OK(status)) {
  59                 return smbd_smb2_request_error(req, status);
  60         }
  61         inhdr = (const uint8_t *)req->in.vector[i+0].iov_base;
  62         inbody = (const uint8_t *)req->in.vector[i+1].iov_base;
  63
  64         in_smbpid = IVAL(inhdr, SMB2_HDR_PID);
  65
  66         in_data_offset          = SVAL(inbody, 0x02);
  67         in_data_length          = IVAL(inbody, 0x04);
  68         in_offset               = BVAL(inbody, 0x08);
  69         in_file_id_persistent   = BVAL(inbody, 0x10);
  70         in_file_id_volatile     = BVAL(inbody, 0x18);
  71         in_flags                = IVAL(inbody, 0x2C);
  72
  73         if (in_data_offset != (SMB2_HDR_BODY + req->in.vector[i+1].iov_len)) {
  74                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  75         }
  76
  77         if (in_data_length > req->in.vector[i+2].iov_len) {
  78                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  79         }
  80
  81         /* check the max write size */
  82         if (in_data_length > req->sconn->smb2.max_write) {
  83                 DEBUG(2,("smbd_smb2_request_process_write : "
  84                         "client ignored max write :%s: 0x%08X: 0x%08X\n",
  85                         __location__, in_data_length, req->sconn->smb2.max_write));
  86                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  87         }
  88
  89         in_data_buffer.data = (uint8_t *)req->in.vector[i+2].iov_base;
  90         in_data_buffer.length = in_data_length;
  91
  92         in_fsp = file_fsp_smb2(req, in_file_id_persistent, in_file_id_volatile);
  93         if (in_fsp == NULL) {
  94                 return smbd_smb2_request_error(req, NT_STATUS_FILE_CLOSED);
  95         }
  96
  97         subreq = smbd_smb2_write_send(req, req->sconn->smb2.event_ctx,
  98                                       req, in_fsp,
  99                                       in_smbpid,
 100                                       in_data_buffer,
 101                                       in_offset,
 102                                       in_flags);
 103         if (subreq == NULL) {
 104                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 105         }
 106         tevent_req_set_callback(subreq, smbd_smb2_request_write_done, req);
 107
 108         return smbd_smb2_request_pending_queue(req, subreq);
 109 }
 110
 111 static void smbd_smb2_request_write_done(struct tevent_req *subreq)
 112 {
 113         struct smbd_smb2_request *req = tevent_req_callback_data(subreq,
 114                                         struct smbd_smb2_request);
 115         int i = req->current_idx;
 116         uint8_t *outhdr;
 117         DATA_BLOB outbody;
 118         DATA_BLOB outdyn;
 119         uint32_t out_count = 0;
 120         NTSTATUS status;
 121         NTSTATUS error; /* transport error */
 122
 123         status = smbd_smb2_write_recv(subreq, &out_count);
 124         TALLOC_FREE(subreq);
 125         if (!NT_STATUS_IS_OK(status)) {
 126                 error = smbd_smb2_request_error(req, status);
 127                 if (!NT_STATUS_IS_OK(error)) {
 128                         smbd_server_connection_terminate(req->sconn,
 129                                                          nt_errstr(error));
 130                         return;
 131                 }
 132                 return;
 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->sconn,
 142                                                          nt_errstr(error));
 143                         return;
 144                 }
 145                 return;
 146         }
 147
 148         SSVAL(outbody.data, 0x00, 0x10 + 1);    /* struct size */
 149         SSVAL(outbody.data, 0x02, 0);           /* reserved */
 150         SIVAL(outbody.data, 0x04, out_count);   /* count */
 151         SIVAL(outbody.data, 0x08, 0);           /* remaining */
 152         SSVAL(outbody.data, 0x0C, 0);           /* write channel info offset */
 153         SSVAL(outbody.data, 0x0E, 0);           /* write channel info length */
 154
 155         outdyn = data_blob_const(NULL, 0);
 156
 157         error = smbd_smb2_request_done(req, outbody, &outdyn);
 158         if (!NT_STATUS_IS_OK(error)) {
 159                 smbd_server_connection_terminate(req->sconn, nt_errstr(error));
 160                 return;
 161         }
 162 }
 163
 164 struct smbd_smb2_write_state {
 165         struct smbd_smb2_request *smb2req;
 166         files_struct *fsp;
 167         bool write_through;
 168         uint32_t in_length;
 169         uint64_t in_offset;
 170         uint32_t out_count;
 171 };
 172
 173 static void smbd_smb2_write_pipe_done(struct tevent_req *subreq);
 174
 175 NTSTATUS smb2_write_complete(struct tevent_req *req, ssize_t nwritten, int err)
 176 {
 177         NTSTATUS status;
 178         struct smbd_smb2_write_state *state = tevent_req_data(req,
 179                                         struct smbd_smb2_write_state);
 180         files_struct *fsp = state->fsp;
 181
 182         DEBUG(3,("smb2: fnum=[%d/%s] "
 183                 "length=%lu offset=%lu wrote=%lu\n",
 184                 fsp->fnum,
 185                 fsp_str_dbg(fsp),
 186                 (unsigned long)state->in_length,
 187                 (unsigned long)state->in_offset,
 188                 (unsigned long)nwritten));
 189
 190         if (nwritten == -1) {
 191                 return map_nt_error_from_unix(err);
 192         }
 193
 194         if ((nwritten == 0) && (state->in_length != 0)) {
 195                 DEBUG(5,("smb2: write [%s] disk full\n",
 196                         fsp_str_dbg(fsp)));
 197                 return NT_STATUS_DISK_FULL;
 198         }
 199
 200         status = sync_file(fsp->conn, fsp, state->write_through);
 201         if (!NT_STATUS_IS_OK(status)) {
 202                 DEBUG(5,("smb2: sync_file for %s returned %s\n",
 203                         fsp_str_dbg(fsp),
 204                         nt_errstr(status)));
 205                 return status;
 206         }
 207
 208         state->out_count = nwritten;
 209
 210         return NT_STATUS_OK;
 211 }
 212
 213 static struct tevent_req *smbd_smb2_write_send(TALLOC_CTX *mem_ctx,
 214                                                struct tevent_context *ev,
 215                                                struct smbd_smb2_request *smb2req,
 216                                                struct files_struct *fsp,
 217                                                uint32_t in_smbpid,
 218                                                DATA_BLOB in_data,
 219                                                uint64_t in_offset,
 220                                                uint32_t in_flags)
 221 {
 222         NTSTATUS status;
 223         struct tevent_req *req = NULL;
 224         struct smbd_smb2_write_state *state = NULL;
 225         struct smb_request *smbreq = NULL;
 226         connection_struct *conn = smb2req->tcon->compat_conn;
 227         ssize_t nwritten;
 228         struct lock_struct lock;
 229
 230         req = tevent_req_create(mem_ctx, &state,
 231                                 struct smbd_smb2_write_state);
 232         if (req == NULL) {
 233                 return NULL;
 234         }
 235         state->smb2req = smb2req;
 236         if (in_flags & 0x00000001) {
 237                 state->write_through = true;
 238         }
 239         state->in_length = in_data.length;
 240         state->out_count = 0;
 241
 242         DEBUG(10,("smbd_smb2_write: %s - fnum[%d]\n",
 243                   fsp_str_dbg(fsp), fsp->fnum));
 244
 245         smbreq = smbd_smb2_fake_smb_request(smb2req);
 246         if (tevent_req_nomem(smbreq, req)) {
 247                 return tevent_req_post(req, ev);
 248         }
 249
 250         state->fsp = fsp;
 251
 252         if (IS_IPC(smbreq->conn)) {
 253                 struct tevent_req *subreq = NULL;
 254
 255                 if (!fsp_is_np(fsp)) {
 256                         tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 257                         return tevent_req_post(req, ev);
 258                 }
 259
 260                 subreq = np_write_send(state, smbd_event_context(),
 261                                        fsp->fake_file_handle,
 262                                        in_data.data,
 263                                        in_data.length);
 264                 if (tevent_req_nomem(subreq, req)) {
 265                         return tevent_req_post(req, ev);
 266                 }
 267                 tevent_req_set_callback(subreq,
 268                                         smbd_smb2_write_pipe_done,
 269                                         req);
 270                 return req;
 271         }
 272
 273         if (!CHECK_WRITE(fsp)) {
 274                 tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
 275                 return tevent_req_post(req, ev);
 276         }
 277
 278         /* Try and do an asynchronous write. */
 279         status = schedule_aio_smb2_write(conn,
 280                                         smbreq,
 281                                         fsp,
 282                                         in_offset,
 283                                         in_data,
 284                                         state->write_through);
 285
 286         if (NT_STATUS_IS_OK(status)) {
 287                 /*
 288                  * Doing an async write. Don't
 289                  * send a "gone async" message
 290                  * as we expect this to be less
 291                  * than the client timeout period.
 292                  * JRA. FIXME for offline files..
 293                  * FIXME - add cancel code..
 294                  */
 295                 smb2req->async = true;
 296                 return req;
 297         }
 298
 299         if (!NT_STATUS_EQUAL(status, NT_STATUS_RETRY)) {
 300                 /* Real error in setting up aio. Fail. */
 301                 tevent_req_nterror(req, status);
 302                 return tevent_req_post(req, ev);
 303         }
 304
 305         /* Fallback to synchronous. */
 306         init_strict_lock_struct(fsp,
 307                                 fsp->fnum,
 308                                 in_offset,
 309                                 in_data.length,
 310                                 WRITE_LOCK,
 311                                 &lock);
 312
 313         if (!SMB_VFS_STRICT_LOCK(conn, fsp, &lock)) {
 314                 tevent_req_nterror(req, NT_STATUS_FILE_LOCK_CONFLICT);
 315                 return tevent_req_post(req, ev);
 316         }
 317
 318         nwritten = write_file(smbreq, fsp,
 319                               (const char *)in_data.data,
 320                               in_offset,
 321                               in_data.length);
 322
 323         status = smb2_write_complete(req, nwritten, errno);
 324
 325         SMB_VFS_STRICT_UNLOCK(conn, fsp, &lock);
 326
 327         DEBUG(10,("smb2: write on "
 328                 "file %s, offset %.0f, requested %u, written = %u\n",
 329                 fsp_str_dbg(fsp),
 330                 (double)in_offset,
 331                 (unsigned int)in_data.length,
 332                 (unsigned int)nwritten ));
 333
 334         if (!NT_STATUS_IS_OK(status)) {
 335                 tevent_req_nterror(req, status);
 336         } else {
 337                 /* Success. */
 338                 tevent_req_done(req);
 339         }
 340
 341         return tevent_req_post(req, ev);
 342 }
 343
 344 static void smbd_smb2_write_pipe_done(struct tevent_req *subreq)
 345 {
 346         struct tevent_req *req = tevent_req_callback_data(subreq,
 347                                  struct tevent_req);
 348         struct smbd_smb2_write_state *state = tevent_req_data(req,
 349                                               struct smbd_smb2_write_state);
 350         NTSTATUS status;
 351         ssize_t nwritten = -1;
 352
 353         status = np_write_recv(subreq, &nwritten);
 354         TALLOC_FREE(subreq);
 355         if (!NT_STATUS_IS_OK(status)) {
 356                 tevent_req_nterror(req, status);
 357                 return;
 358         }
 359
 360         if ((nwritten == 0 && state->in_length != 0) || (nwritten < 0)) {
 361                 tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
 362                 return;
 363         }
 364
 365         state->out_count = nwritten;
 366
 367         tevent_req_done(req);
 368 }
 369
 370 static NTSTATUS smbd_smb2_write_recv(struct tevent_req *req,
 371                                      uint32_t *out_count)
 372 {
 373         NTSTATUS status;
 374         struct smbd_smb2_write_state *state = tevent_req_data(req,
 375                                               struct smbd_smb2_write_state);
 376
 377         if (tevent_req_is_nterror(req, &status)) {
 378                 tevent_req_received(req);
 379                 return status;
 380         }
 381
 382         *out_count = state->out_count;
 383
 384         tevent_req_received(req);
 385         return NT_STATUS_OK;
 386 }