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                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  86         }
  87
  88         in_data_buffer.data = (uint8_t *)req->in.vector[i+2].iov_base;
  89         in_data_buffer.length = in_data_length;
  90
  91         if (req->compat_chain_fsp) {
  92                 /* skip check */
  93         } else if (in_file_id_persistent != in_file_id_volatile) {
  94                 return smbd_smb2_request_error(req, NT_STATUS_FILE_CLOSED);
  95         }
  96
  97         subreq = smbd_smb2_write_send(req,
  98                                       req->sconn->smb2.event_ctx,
  99                                       req,
 100                                       in_smbpid,
 101                                       in_file_id_volatile,
 102                                       in_data_buffer,
 103                                       in_offset,
 104                                       in_flags);
 105         if (subreq == NULL) {
 106                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 107         }
 108         tevent_req_set_callback(subreq, smbd_smb2_request_write_done, req);
 109
 110         return smbd_smb2_request_pending_queue(req, subreq);
 111 }
 112
 113 static void smbd_smb2_request_write_done(struct tevent_req *subreq)
 114 {
 115         struct smbd_smb2_request *req = tevent_req_callback_data(subreq,
 116                                         struct smbd_smb2_request);
 117         int i = req->current_idx;
 118         uint8_t *outhdr;
 119         DATA_BLOB outbody;
 120         DATA_BLOB outdyn;
 121         uint32_t out_count = 0;
 122         NTSTATUS status;
 123         NTSTATUS error; /* transport error */
 124
 125         status = smbd_smb2_write_recv(subreq, &out_count);
 126         TALLOC_FREE(subreq);
 127         if (!NT_STATUS_IS_OK(status)) {
 128                 error = smbd_smb2_request_error(req, status);
 129                 if (!NT_STATUS_IS_OK(error)) {
 130                         smbd_server_connection_terminate(req->sconn,
 131                                                          nt_errstr(error));
 132                         return;
 133                 }
 134                 return;
 135         }
 136
 137         outhdr = (uint8_t *)req->out.vector[i].iov_base;
 138
 139         outbody = data_blob_talloc(req->out.vector, NULL, 0x10);
 140         if (outbody.data == NULL) {
 141                 error = smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 142                 if (!NT_STATUS_IS_OK(error)) {
 143                         smbd_server_connection_terminate(req->sconn,
 144                                                          nt_errstr(error));
 145                         return;
 146                 }
 147                 return;
 148         }
 149
 150         SSVAL(outbody.data, 0x00, 0x10 + 1);    /* struct size */
 151         SSVAL(outbody.data, 0x02, 0);           /* reserved */
 152         SIVAL(outbody.data, 0x04, out_count);   /* count */
 153         SIVAL(outbody.data, 0x08, 0);           /* remaining */
 154         SSVAL(outbody.data, 0x0C, 0);           /* write channel info offset */
 155         SSVAL(outbody.data, 0x0E, 0);           /* write channel info length */
 156
 157         outdyn = data_blob_const(NULL, 0);
 158
 159         error = smbd_smb2_request_done(req, outbody, &outdyn);
 160         if (!NT_STATUS_IS_OK(error)) {
 161                 smbd_server_connection_terminate(req->sconn, nt_errstr(error));
 162                 return;
 163         }
 164 }
 165
 166 struct smbd_smb2_write_state {
 167         struct smbd_smb2_request *smb2req;
 168         files_struct *fsp;
 169         bool write_through;
 170         uint32_t in_length;
 171         uint64_t in_offset;
 172         uint32_t out_count;
 173 };
 174
 175 static void smbd_smb2_write_pipe_done(struct tevent_req *subreq);
 176
 177 NTSTATUS smb2_write_complete(struct tevent_req *req, ssize_t nwritten, int err)
 178 {
 179         NTSTATUS status;
 180         struct smbd_smb2_write_state *state = tevent_req_data(req,
 181                                         struct smbd_smb2_write_state);
 182         files_struct *fsp = state->fsp;
 183
 184         DEBUG(3,("smb2: fnum=[%d/%s] "
 185                 "length=%lu offset=%lu wrote=%lu\n",
 186                 fsp->fnum,
 187                 fsp_str_dbg(fsp),
 188                 (unsigned long)state->in_length,
 189                 (unsigned long)state->in_offset,
 190                 (unsigned long)nwritten));
 191
 192         if (nwritten == -1) {
 193                 return map_nt_error_from_unix(err);
 194         }
 195
 196         if ((nwritten == 0) && (state->in_length != 0)) {
 197                 DEBUG(5,("smb2: write [%s] disk full\n",
 198                         fsp_str_dbg(fsp)));
 199                 return NT_STATUS_DISK_FULL;
 200         }
 201
 202         status = sync_file(fsp->conn, fsp, state->write_through);
 203         if (!NT_STATUS_IS_OK(status)) {
 204                 DEBUG(5,("smb2: sync_file for %s returned %s\n",
 205                         fsp_str_dbg(fsp),
 206                         nt_errstr(status)));
 207                 return status;
 208         }
 209
 210         state->out_count = nwritten;
 211
 212         return NT_STATUS_OK;
 213 }
 214
 215 static struct tevent_req *smbd_smb2_write_send(TALLOC_CTX *mem_ctx,
 216                                                struct tevent_context *ev,
 217                                                struct smbd_smb2_request *smb2req,
 218                                                uint32_t in_smbpid,
 219                                                uint64_t in_file_id_volatile,
 220                                                DATA_BLOB in_data,
 221                                                uint64_t in_offset,
 222                                                uint32_t in_flags)
 223 {
 224         NTSTATUS status;
 225         struct tevent_req *req = NULL;
 226         struct smbd_smb2_write_state *state = NULL;
 227         struct smb_request *smbreq = NULL;
 228         connection_struct *conn = smb2req->tcon->compat_conn;
 229         files_struct *fsp = NULL;
 230         ssize_t nwritten;
 231         struct lock_struct lock;
 232
 233         req = tevent_req_create(mem_ctx, &state,
 234                                 struct smbd_smb2_write_state);
 235         if (req == NULL) {
 236                 return NULL;
 237         }
 238         state->smb2req = smb2req;
 239         if (in_flags & 0x00000001) {
 240                 state->write_through = true;
 241         }
 242         state->in_length = in_data.length;
 243         state->out_count = 0;
 244
 245         DEBUG(10,("smbd_smb2_write: file_id[0x%016llX]\n",
 246                   (unsigned long long)in_file_id_volatile));
 247
 248         smbreq = smbd_smb2_fake_smb_request(smb2req);
 249         if (tevent_req_nomem(smbreq, req)) {
 250                 return tevent_req_post(req, ev);
 251         }
 252
 253         fsp = file_fsp(smbreq, (uint16_t)in_file_id_volatile);
 254         if (fsp == NULL) {
 255                 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 256                 return tevent_req_post(req, ev);
 257         }
 258         if (conn != fsp->conn) {
 259                 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 260                 return tevent_req_post(req, ev);
 261         }
 262         if (smb2req->session->vuid != fsp->vuid) {
 263                 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 264                 return tevent_req_post(req, ev);
 265         }
 266
 267         state->fsp = fsp;
 268
 269         if (IS_IPC(smbreq->conn)) {
 270                 struct tevent_req *subreq = NULL;
 271
 272                 if (!fsp_is_np(fsp)) {
 273                         tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 274                         return tevent_req_post(req, ev);
 275                 }
 276
 277                 subreq = np_write_send(state, smbd_event_context(),
 278                                        fsp->fake_file_handle,
 279                                        in_data.data,
 280                                        in_data.length);
 281                 if (tevent_req_nomem(subreq, req)) {
 282                         return tevent_req_post(req, ev);
 283                 }
 284                 tevent_req_set_callback(subreq,
 285                                         smbd_smb2_write_pipe_done,
 286                                         req);
 287                 return req;
 288         }
 289
 290         if (!CHECK_WRITE(fsp)) {
 291                 tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
 292                 return tevent_req_post(req, ev);
 293         }
 294
 295         /* Try and do an asynchronous write. */
 296         status = schedule_aio_smb2_write(conn,
 297                                         smbreq,
 298                                         fsp,
 299                                         in_offset,
 300                                         in_data,
 301                                         state->write_through);
 302
 303         if (NT_STATUS_IS_OK(status)) {
 304                 /*
 305                  * Doing an async write. Don't
 306                  * send a "gone async" message
 307                  * as we expect this to be less
 308                  * than the client timeout period.
 309                  * JRA. FIXME for offline files..
 310                  * FIXME - add cancel code..
 311                  */
 312                 smb2req->async = true;
 313                 return req;
 314         }
 315
 316         if (!NT_STATUS_EQUAL(status, NT_STATUS_RETRY)) {
 317                 /* Real error in setting up aio. Fail. */
 318                 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 319                 return tevent_req_post(req, ev);
 320         }
 321
 322         /* Fallback to synchronous. */
 323         init_strict_lock_struct(fsp,
 324                                 in_file_id_volatile,
 325                                 in_offset,
 326                                 in_data.length,
 327                                 WRITE_LOCK,
 328                                 &lock);
 329
 330         if (!SMB_VFS_STRICT_LOCK(conn, fsp, &lock)) {
 331                 tevent_req_nterror(req, NT_STATUS_FILE_LOCK_CONFLICT);
 332                 return tevent_req_post(req, ev);
 333         }
 334
 335         nwritten = write_file(smbreq, fsp,
 336                               (const char *)in_data.data,
 337                               in_offset,
 338                               in_data.length);
 339
 340         status = smb2_write_complete(req, nwritten, errno);
 341
 342         SMB_VFS_STRICT_UNLOCK(conn, fsp, &lock);
 343
 344         DEBUG(10,("smb2: write on "
 345                 "file %s, offset %.0f, requested %u, written = %u\n",
 346                 fsp_str_dbg(fsp),
 347                 (double)in_offset,
 348                 (unsigned int)in_data.length,
 349                 (unsigned int)nwritten ));
 350
 351         if (!NT_STATUS_IS_OK(status)) {
 352                 tevent_req_nterror(req, status);
 353         } else {
 354                 /* Success. */
 355                 tevent_req_done(req);
 356         }
 357
 358         return tevent_req_post(req, ev);
 359 }
 360
 361 static void smbd_smb2_write_pipe_done(struct tevent_req *subreq)
 362 {
 363         struct tevent_req *req = tevent_req_callback_data(subreq,
 364                                  struct tevent_req);
 365         struct smbd_smb2_write_state *state = tevent_req_data(req,
 366                                               struct smbd_smb2_write_state);
 367         NTSTATUS status;
 368         ssize_t nwritten = -1;
 369
 370         status = np_write_recv(subreq, &nwritten);
 371         TALLOC_FREE(subreq);
 372         if (!NT_STATUS_IS_OK(status)) {
 373                 tevent_req_nterror(req, status);
 374                 return;
 375         }
 376
 377         if ((nwritten == 0 && state->in_length != 0) || (nwritten < 0)) {
 378                 tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
 379                 return;
 380         }
 381
 382         state->out_count = nwritten;
 383
 384         tevent_req_done(req);
 385 }
 386
 387 static NTSTATUS smbd_smb2_write_recv(struct tevent_req *req,
 388                                      uint32_t *out_count)
 389 {
 390         NTSTATUS status;
 391         struct smbd_smb2_write_state *state = tevent_req_data(req,
 392                                               struct smbd_smb2_write_state);
 393
 394         if (tevent_req_is_nterror(req, &status)) {
 395                 tevent_req_received(req);
 396                 return status;
 397         }
 398
 399         *out_count = state->out_count;
 400
 401         tevent_req_received(req);
 402         return NT_STATUS_OK;
 403 }