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->ev_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, 500);
 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         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         outbody = data_blob_talloc(req->out.vector, NULL, 0x10);
 136         if (outbody.data == NULL) {
 137                 error = smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 138                 if (!NT_STATUS_IS_OK(error)) {
 139                         smbd_server_connection_terminate(req->sconn,
 140                                                          nt_errstr(error));
 141                         return;
 142                 }
 143                 return;
 144         }
 145
 146         SSVAL(outbody.data, 0x00, 0x10 + 1);    /* struct size */
 147         SSVAL(outbody.data, 0x02, 0);           /* reserved */
 148         SIVAL(outbody.data, 0x04, out_count);   /* count */
 149         SIVAL(outbody.data, 0x08, 0);           /* remaining */
 150         SSVAL(outbody.data, 0x0C, 0);           /* write channel info offset */
 151         SSVAL(outbody.data, 0x0E, 0);           /* write channel info length */
 152
 153         outdyn = data_blob_const(NULL, 0);
 154
 155         error = smbd_smb2_request_done(req, outbody, &outdyn);
 156         if (!NT_STATUS_IS_OK(error)) {
 157                 smbd_server_connection_terminate(req->sconn, nt_errstr(error));
 158                 return;
 159         }
 160 }
 161
 162 struct smbd_smb2_write_state {
 163         struct smbd_smb2_request *smb2req;
 164         struct smb_request *smbreq;
 165         files_struct *fsp;
 166         bool write_through;
 167         uint32_t in_length;
 168         uint64_t in_offset;
 169         uint32_t out_count;
 170 };
 171
 172 static void smbd_smb2_write_pipe_done(struct tevent_req *subreq);
 173
 174 NTSTATUS smb2_write_complete(struct tevent_req *req, ssize_t nwritten, int err)
 175 {
 176         NTSTATUS status;
 177         struct smbd_smb2_write_state *state = tevent_req_data(req,
 178                                         struct smbd_smb2_write_state);
 179         files_struct *fsp = state->fsp;
 180
 181         if (nwritten == -1) {
 182                 status = map_nt_error_from_unix(err);
 183
 184                 DEBUG(2, ("smb2_write failed: fnum=[%d/%s] "
 185                           "length=%lu offset=%lu nwritten=-1: %s\n",
 186                           fsp->fnum,
 187                           fsp_str_dbg(fsp),
 188                           (unsigned long)state->in_length,
 189                           (unsigned long)state->in_offset,
 190                           nt_errstr(status)));
 191
 192                 return status;
 193         }
 194
 195         DEBUG(3,("smb2: fnum=[%d/%s] "
 196                 "length=%lu offset=%lu wrote=%lu\n",
 197                 fsp->fnum,
 198                 fsp_str_dbg(fsp),
 199                 (unsigned long)state->in_length,
 200                 (unsigned long)state->in_offset,
 201                 (unsigned long)nwritten));
 202
 203         if ((nwritten == 0) && (state->in_length != 0)) {
 204                 DEBUG(5,("smb2: write [%s] disk full\n",
 205                         fsp_str_dbg(fsp)));
 206                 return NT_STATUS_DISK_FULL;
 207         }
 208
 209         status = sync_file(fsp->conn, fsp, state->write_through);
 210         if (!NT_STATUS_IS_OK(status)) {
 211                 DEBUG(5,("smb2: sync_file for %s returned %s\n",
 212                         fsp_str_dbg(fsp),
 213                         nt_errstr(status)));
 214                 return status;
 215         }
 216
 217         state->out_count = nwritten;
 218
 219         return NT_STATUS_OK;
 220 }
 221
 222 static bool smbd_smb2_write_cancel(struct tevent_req *req)
 223 {
 224         struct smbd_smb2_write_state *state =
 225                 tevent_req_data(req,
 226                 struct smbd_smb2_write_state);
 227
 228         state->smb2req->cancelled = true;
 229
 230         return cancel_smb2_aio(state->smbreq);
 231 }
 232
 233 static struct tevent_req *smbd_smb2_write_send(TALLOC_CTX *mem_ctx,
 234                                                struct tevent_context *ev,
 235                                                struct smbd_smb2_request *smb2req,
 236                                                uint32_t in_smbpid,
 237                                                uint64_t in_file_id_volatile,
 238                                                DATA_BLOB in_data,
 239                                                uint64_t in_offset,
 240                                                uint32_t in_flags)
 241 {
 242         NTSTATUS status;
 243         struct tevent_req *req = NULL;
 244         struct smbd_smb2_write_state *state = NULL;
 245         struct smb_request *smbreq = NULL;
 246         connection_struct *conn = smb2req->tcon->compat_conn;
 247         files_struct *fsp = NULL;
 248         ssize_t nwritten;
 249         struct lock_struct lock;
 250
 251         req = tevent_req_create(mem_ctx, &state,
 252                                 struct smbd_smb2_write_state);
 253         if (req == NULL) {
 254                 return NULL;
 255         }
 256         state->smb2req = smb2req;
 257         if (in_flags & SMB2_WRITEFLAG_WRITE_THROUGH) {
 258                 state->write_through = true;
 259         }
 260         state->in_length = in_data.length;
 261         state->out_count = 0;
 262
 263         DEBUG(10,("smbd_smb2_write: file_id[0x%016llX]\n",
 264                   (unsigned long long)in_file_id_volatile));
 265
 266         smbreq = smbd_smb2_fake_smb_request(smb2req);
 267         if (tevent_req_nomem(smbreq, req)) {
 268                 return tevent_req_post(req, ev);
 269         }
 270         state->smbreq = smbreq;
 271
 272         fsp = file_fsp(smbreq, (uint16_t)in_file_id_volatile);
 273         if (fsp == NULL) {
 274                 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 275                 return tevent_req_post(req, ev);
 276         }
 277         if (conn != fsp->conn) {
 278                 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 279                 return tevent_req_post(req, ev);
 280         }
 281         if (smb2req->session->vuid != fsp->vuid) {
 282                 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 283                 return tevent_req_post(req, ev);
 284         }
 285
 286         state->fsp = fsp;
 287
 288         if (IS_IPC(smbreq->conn)) {
 289                 struct tevent_req *subreq = NULL;
 290
 291                 if (!fsp_is_np(fsp)) {
 292                         tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 293                         return tevent_req_post(req, ev);
 294                 }
 295
 296                 subreq = np_write_send(state, ev,
 297                                        fsp->fake_file_handle,
 298                                        in_data.data,
 299                                        in_data.length);
 300                 if (tevent_req_nomem(subreq, req)) {
 301                         return tevent_req_post(req, ev);
 302                 }
 303                 tevent_req_set_callback(subreq,
 304                                         smbd_smb2_write_pipe_done,
 305                                         req);
 306                 return req;
 307         }
 308
 309         if (!CHECK_WRITE(fsp)) {
 310                 tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
 311                 return tevent_req_post(req, ev);
 312         }
 313
 314         /* Try and do an asynchronous write. */
 315         status = schedule_aio_smb2_write(conn,
 316                                         smbreq,
 317                                         fsp,
 318                                         in_offset,
 319                                         in_data,
 320                                         state->write_through);
 321
 322         if (NT_STATUS_IS_OK(status)) {
 323                 /*
 324                  * Doing an async write, allow this
 325                  * request to be canceled
 326                  */
 327                 tevent_req_set_cancel_fn(req, smbd_smb2_write_cancel);
 328                 return req;
 329         }
 330
 331         if (!NT_STATUS_EQUAL(status, NT_STATUS_RETRY)) {
 332                 /* Real error in setting up aio. Fail. */
 333                 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 334                 return tevent_req_post(req, ev);
 335         }
 336
 337         /* Fallback to synchronous. */
 338         init_strict_lock_struct(fsp,
 339                                 in_file_id_volatile,
 340                                 in_offset,
 341                                 in_data.length,
 342                                 WRITE_LOCK,
 343                                 &lock);
 344
 345         if (!SMB_VFS_STRICT_LOCK(conn, fsp, &lock)) {
 346                 tevent_req_nterror(req, NT_STATUS_FILE_LOCK_CONFLICT);
 347                 return tevent_req_post(req, ev);
 348         }
 349
 350         nwritten = write_file(smbreq, fsp,
 351                               (const char *)in_data.data,
 352                               in_offset,
 353                               in_data.length);
 354
 355         status = smb2_write_complete(req, nwritten, errno);
 356
 357         SMB_VFS_STRICT_UNLOCK(conn, fsp, &lock);
 358
 359         DEBUG(10,("smb2: write on "
 360                 "file %s, offset %.0f, requested %u, written = %u\n",
 361                 fsp_str_dbg(fsp),
 362                 (double)in_offset,
 363                 (unsigned int)in_data.length,
 364                 (unsigned int)nwritten ));
 365
 366         if (!NT_STATUS_IS_OK(status)) {
 367                 tevent_req_nterror(req, status);
 368         } else {
 369                 /* Success. */
 370                 tevent_req_done(req);
 371         }
 372
 373         return tevent_req_post(req, ev);
 374 }
 375
 376 static void smbd_smb2_write_pipe_done(struct tevent_req *subreq)
 377 {
 378         struct tevent_req *req = tevent_req_callback_data(subreq,
 379                                  struct tevent_req);
 380         struct smbd_smb2_write_state *state = tevent_req_data(req,
 381                                               struct smbd_smb2_write_state);
 382         NTSTATUS status;
 383         ssize_t nwritten = -1;
 384
 385         status = np_write_recv(subreq, &nwritten);
 386         TALLOC_FREE(subreq);
 387         if (!NT_STATUS_IS_OK(status)) {
 388                 tevent_req_nterror(req, status);
 389                 return;
 390         }
 391
 392         if ((nwritten == 0 && state->in_length != 0) || (nwritten < 0)) {
 393                 tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
 394                 return;
 395         }
 396
 397         state->out_count = nwritten;
 398
 399         tevent_req_done(req);
 400 }
 401
 402 static NTSTATUS smbd_smb2_write_recv(struct tevent_req *req,
 403                                      uint32_t *out_count)
 404 {
 405         NTSTATUS status;
 406         struct smbd_smb2_write_state *state = tevent_req_data(req,
 407                                               struct smbd_smb2_write_state);
 408
 409         if (tevent_req_is_nterror(req, &status)) {
 410                 tevent_req_received(req);
 411                 return status;
 412         }
 413
 414         *out_count = state->out_count;
 415
 416         tevent_req_received(req);
 417         return NT_STATUS_OK;
 418 }