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         status = smbd_smb2_request_verify_creditcharge(req, in_data_length);
  93         if (!NT_STATUS_IS_OK(status)) {
  94                 return smbd_smb2_request_error(req, status);
  95         }
  96
  97         in_fsp = file_fsp_smb2(req, in_file_id_persistent, in_file_id_volatile);
  98         if (in_fsp == NULL) {
  99                 return smbd_smb2_request_error(req, NT_STATUS_FILE_CLOSED);
 100         }
 101
 102         subreq = smbd_smb2_write_send(req, req->sconn->ev_ctx,
 103                                       req, in_fsp,
 104                                       in_smbpid,
 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, 500);
 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         DATA_BLOB outbody;
 121         DATA_BLOB outdyn;
 122         uint32_t out_count = 0;
 123         NTSTATUS status;
 124         NTSTATUS error; /* transport error */
 125
 126         status = smbd_smb2_write_recv(subreq, &out_count);
 127         TALLOC_FREE(subreq);
 128         if (!NT_STATUS_IS_OK(status)) {
 129                 error = smbd_smb2_request_error(req, status);
 130                 if (!NT_STATUS_IS_OK(error)) {
 131                         smbd_server_connection_terminate(req->sconn,
 132                                                          nt_errstr(error));
 133                         return;
 134                 }
 135                 return;
 136         }
 137
 138         outbody = data_blob_talloc(req->out.vector, NULL, 0x10);
 139         if (outbody.data == NULL) {
 140                 error = smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 141                 if (!NT_STATUS_IS_OK(error)) {
 142                         smbd_server_connection_terminate(req->sconn,
 143                                                          nt_errstr(error));
 144                         return;
 145                 }
 146                 return;
 147         }
 148
 149         SSVAL(outbody.data, 0x00, 0x10 + 1);    /* struct size */
 150         SSVAL(outbody.data, 0x02, 0);           /* reserved */
 151         SIVAL(outbody.data, 0x04, out_count);   /* count */
 152         SIVAL(outbody.data, 0x08, 0);           /* remaining */
 153         SSVAL(outbody.data, 0x0C, 0);           /* write channel info offset */
 154         SSVAL(outbody.data, 0x0E, 0);           /* write channel info length */
 155
 156         outdyn = data_blob_const(NULL, 0);
 157
 158         error = smbd_smb2_request_done(req, outbody, &outdyn);
 159         if (!NT_STATUS_IS_OK(error)) {
 160                 smbd_server_connection_terminate(req->sconn, nt_errstr(error));
 161                 return;
 162         }
 163 }
 164
 165 struct smbd_smb2_write_state {
 166         struct smbd_smb2_request *smb2req;
 167         struct smb_request *smbreq;
 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         if (nwritten == -1) {
 185                 status = map_nt_error_from_unix(err);
 186
 187                 DEBUG(2, ("smb2_write failed: %s, file %s, "
 188                           "length=%lu offset=%lu nwritten=-1: %s\n",
 189                           fsp_fnum_dbg(fsp),
 190                           fsp_str_dbg(fsp),
 191                           (unsigned long)state->in_length,
 192                           (unsigned long)state->in_offset,
 193                           nt_errstr(status)));
 194
 195                 return status;
 196         }
 197
 198         DEBUG(3,("smb2: %s, file %s, "
 199                 "length=%lu offset=%lu wrote=%lu\n",
 200                 fsp_fnum_dbg(fsp),
 201                 fsp_str_dbg(fsp),
 202                 (unsigned long)state->in_length,
 203                 (unsigned long)state->in_offset,
 204                 (unsigned long)nwritten));
 205
 206         if ((nwritten == 0) && (state->in_length != 0)) {
 207                 DEBUG(5,("smb2: write [%s] disk full\n",
 208                         fsp_str_dbg(fsp)));
 209                 return NT_STATUS_DISK_FULL;
 210         }
 211
 212         status = sync_file(fsp->conn, fsp, state->write_through);
 213         if (!NT_STATUS_IS_OK(status)) {
 214                 DEBUG(5,("smb2: sync_file for %s returned %s\n",
 215                         fsp_str_dbg(fsp),
 216                         nt_errstr(status)));
 217                 return status;
 218         }
 219
 220         state->out_count = nwritten;
 221
 222         return NT_STATUS_OK;
 223 }
 224
 225 static bool smbd_smb2_write_cancel(struct tevent_req *req)
 226 {
 227         struct smbd_smb2_write_state *state =
 228                 tevent_req_data(req,
 229                 struct smbd_smb2_write_state);
 230
 231         state->smb2req->cancelled = true;
 232
 233         return cancel_smb2_aio(state->smbreq);
 234 }
 235
 236 static struct tevent_req *smbd_smb2_write_send(TALLOC_CTX *mem_ctx,
 237                                                struct tevent_context *ev,
 238                                                struct smbd_smb2_request *smb2req,
 239                                                struct files_struct *fsp,
 240                                                uint32_t in_smbpid,
 241                                                DATA_BLOB in_data,
 242                                                uint64_t in_offset,
 243                                                uint32_t in_flags)
 244 {
 245         NTSTATUS status;
 246         struct tevent_req *req = NULL;
 247         struct smbd_smb2_write_state *state = NULL;
 248         struct smb_request *smbreq = NULL;
 249         connection_struct *conn = smb2req->tcon->compat;
 250         ssize_t nwritten;
 251         struct lock_struct lock;
 252
 253         req = tevent_req_create(mem_ctx, &state,
 254                                 struct smbd_smb2_write_state);
 255         if (req == NULL) {
 256                 return NULL;
 257         }
 258         state->smb2req = smb2req;
 259         if (in_flags & SMB2_WRITEFLAG_WRITE_THROUGH) {
 260                 state->write_through = true;
 261         }
 262         state->in_length = in_data.length;
 263         state->out_count = 0;
 264
 265         DEBUG(10,("smbd_smb2_write: %s - %s\n",
 266                   fsp_str_dbg(fsp), fsp_fnum_dbg(fsp)));
 267
 268         smbreq = smbd_smb2_fake_smb_request(smb2req);
 269         if (tevent_req_nomem(smbreq, req)) {
 270                 return tevent_req_post(req, ev);
 271         }
 272         state->smbreq = smbreq;
 273
 274         state->fsp = fsp;
 275
 276         if (IS_IPC(smbreq->conn)) {
 277                 struct tevent_req *subreq = NULL;
 278
 279                 if (!fsp_is_np(fsp)) {
 280                         tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 281                         return tevent_req_post(req, ev);
 282                 }
 283
 284                 subreq = np_write_send(state, ev,
 285                                        fsp->fake_file_handle,
 286                                        in_data.data,
 287                                        in_data.length);
 288                 if (tevent_req_nomem(subreq, req)) {
 289                         return tevent_req_post(req, ev);
 290                 }
 291                 tevent_req_set_callback(subreq,
 292                                         smbd_smb2_write_pipe_done,
 293                                         req);
 294                 return req;
 295         }
 296
 297         if (!CHECK_WRITE(fsp)) {
 298                 tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
 299                 return tevent_req_post(req, ev);
 300         }
 301
 302         /* Try and do an asynchronous write. */
 303         status = schedule_aio_smb2_write(conn,
 304                                         smbreq,
 305                                         fsp,
 306                                         in_offset,
 307                                         in_data,
 308                                         state->write_through);
 309
 310         if (NT_STATUS_IS_OK(status)) {
 311                 /*
 312                  * Doing an async write, allow this
 313                  * request to be canceled
 314                  */
 315                 tevent_req_set_cancel_fn(req, smbd_smb2_write_cancel);
 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, status);
 322                 return tevent_req_post(req, ev);
 323         }
 324
 325         /* Fallback to synchronous. */
 326         init_strict_lock_struct(fsp,
 327                                 fsp->op->global->open_persistent_id,
 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                 NTSTATUS old = status;
 377                 status = nt_status_np_pipe(old);
 378                 tevent_req_nterror(req, status);
 379                 return;
 380         }
 381
 382         if ((nwritten == 0 && state->in_length != 0) || (nwritten < 0)) {
 383                 tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
 384                 return;
 385         }
 386
 387         state->out_count = nwritten;
 388
 389         tevent_req_done(req);
 390 }
 391
 392 static NTSTATUS smbd_smb2_write_recv(struct tevent_req *req,
 393                                      uint32_t *out_count)
 394 {
 395         NTSTATUS status;
 396         struct smbd_smb2_write_state *state = tevent_req_data(req,
 397                                               struct smbd_smb2_write_state);
 398
 399         if (tevent_req_is_nterror(req, &status)) {
 400                 tevent_req_received(req);
 401                 return status;
 402         }
 403
 404         *out_count = state->out_count;
 405
 406         tevent_req_received(req);
 407         return NT_STATUS_OK;
 408 }