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                                                DATA_BLOB in_data,
  33                                                uint64_t in_offset,
  34                                                uint32_t in_flags);
  35 static NTSTATUS smbd_smb2_write_recv(struct tevent_req *req,
  36                                      uint32_t *out_count);
  37
  38 static void smbd_smb2_request_write_done(struct tevent_req *subreq);
  39 NTSTATUS smbd_smb2_request_process_write(struct smbd_smb2_request *req)
  40 {
  41         struct smbXsrv_connection *xconn = req->xconn;
  42         NTSTATUS status;
  43         const uint8_t *inbody;
  44         uint16_t in_data_offset;
  45         uint32_t in_data_length;
  46         DATA_BLOB in_data_buffer;
  47         uint64_t in_offset;
  48         uint64_t in_file_id_persistent;
  49         uint64_t in_file_id_volatile;
  50         struct files_struct *in_fsp;
  51         uint32_t in_flags;
  52         size_t in_dyn_len = 0;
  53         uint8_t *in_dyn_ptr = NULL;
  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         inbody = SMBD_SMB2_IN_BODY_PTR(req);
  61
  62         in_data_offset          = SVAL(inbody, 0x02);
  63         in_data_length          = IVAL(inbody, 0x04);
  64         in_offset               = BVAL(inbody, 0x08);
  65         in_file_id_persistent   = BVAL(inbody, 0x10);
  66         in_file_id_volatile     = BVAL(inbody, 0x18);
  67         in_flags                = IVAL(inbody, 0x2C);
  68
  69         if (in_data_offset != (SMB2_HDR_BODY + SMBD_SMB2_IN_BODY_LEN(req))) {
  70                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  71         }
  72
  73         if (req->smb1req != NULL && req->smb1req->unread_bytes > 0) {
  74                 in_dyn_ptr = NULL;
  75                 in_dyn_len = req->smb1req->unread_bytes;
  76         } else {
  77                 in_dyn_ptr = SMBD_SMB2_IN_DYN_PTR(req);
  78                 in_dyn_len = SMBD_SMB2_IN_DYN_LEN(req);
  79         }
  80
  81         if (in_data_length > in_dyn_len) {
  82                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  83         }
  84
  85         /* check the max write size */
  86         if (in_data_length > xconn->smb2.server.max_write) {
  87                 DEBUG(2,("smbd_smb2_request_process_write : "
  88                         "client ignored max write :%s: 0x%08X: 0x%08X\n",
  89                         __location__, in_data_length, xconn->smb2.server.max_write));
  90                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  91         }
  92
  93         /*
  94          * Note: that in_dyn_ptr is NULL for the recvfile case.
  95          */
  96         in_data_buffer.data = in_dyn_ptr;
  97         in_data_buffer.length = in_data_length;
  98
  99         status = smbd_smb2_request_verify_creditcharge(req, in_data_length);
 100         if (!NT_STATUS_IS_OK(status)) {
 101                 return smbd_smb2_request_error(req, status);
 102         }
 103
 104         in_fsp = file_fsp_smb2(req, in_file_id_persistent, in_file_id_volatile);
 105         if (in_fsp == NULL) {
 106                 return smbd_smb2_request_error(req, NT_STATUS_FILE_CLOSED);
 107         }
 108
 109         subreq = smbd_smb2_write_send(req, req->sconn->ev_ctx,
 110                                       req, in_fsp,
 111                                       in_data_buffer,
 112                                       in_offset,
 113                                       in_flags);
 114         if (subreq == NULL) {
 115                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 116         }
 117         tevent_req_set_callback(subreq, smbd_smb2_request_write_done, req);
 118
 119         return smbd_smb2_request_pending_queue(req, subreq, 500);
 120 }
 121
 122 static void smbd_smb2_request_write_done(struct tevent_req *subreq)
 123 {
 124         struct smbd_smb2_request *req = tevent_req_callback_data(subreq,
 125                                         struct smbd_smb2_request);
 126         DATA_BLOB outbody;
 127         DATA_BLOB outdyn;
 128         uint32_t out_count = 0;
 129         NTSTATUS status;
 130         NTSTATUS error; /* transport error */
 131
 132         status = smbd_smb2_write_recv(subreq, &out_count);
 133         TALLOC_FREE(subreq);
 134         if (!NT_STATUS_IS_OK(status)) {
 135                 error = smbd_smb2_request_error(req, status);
 136                 if (!NT_STATUS_IS_OK(error)) {
 137                         smbd_server_connection_terminate(req->xconn,
 138                                                          nt_errstr(error));
 139                         return;
 140                 }
 141                 return;
 142         }
 143
 144         outbody = smbd_smb2_generate_outbody(req, 0x10);
 145         if (outbody.data == NULL) {
 146                 error = smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 147                 if (!NT_STATUS_IS_OK(error)) {
 148                         smbd_server_connection_terminate(req->xconn,
 149                                                          nt_errstr(error));
 150                         return;
 151                 }
 152                 return;
 153         }
 154
 155         SSVAL(outbody.data, 0x00, 0x10 + 1);    /* struct size */
 156         SSVAL(outbody.data, 0x02, 0);           /* reserved */
 157         SIVAL(outbody.data, 0x04, out_count);   /* count */
 158         SIVAL(outbody.data, 0x08, 0);           /* remaining */
 159         SSVAL(outbody.data, 0x0C, 0);           /* write channel info offset */
 160         SSVAL(outbody.data, 0x0E, 0);           /* write channel info length */
 161
 162         outdyn = data_blob_const(NULL, 0);
 163
 164         error = smbd_smb2_request_done(req, outbody, &outdyn);
 165         if (!NT_STATUS_IS_OK(error)) {
 166                 smbd_server_connection_terminate(req->xconn, nt_errstr(error));
 167                 return;
 168         }
 169 }
 170
 171 struct smbd_smb2_write_state {
 172         struct smbd_smb2_request *smb2req;
 173         struct smb_request *smbreq;
 174         files_struct *fsp;
 175         bool write_through;
 176         uint32_t in_length;
 177         uint64_t in_offset;
 178         uint32_t out_count;
 179 };
 180
 181 static void smbd_smb2_write_pipe_done(struct tevent_req *subreq);
 182
 183 static NTSTATUS smb2_write_complete_internal(struct tevent_req *req,
 184                                              ssize_t nwritten, int err,
 185                                              bool do_sync)
 186 {
 187         NTSTATUS status;
 188         struct smbd_smb2_write_state *state = tevent_req_data(req,
 189                                         struct smbd_smb2_write_state);
 190         files_struct *fsp = state->fsp;
 191
 192         if (nwritten == -1) {
 193                 status = map_nt_error_from_unix(err);
 194
 195                 DEBUG(2, ("smb2_write failed: %s, file %s, "
 196                           "length=%lu offset=%lu nwritten=-1: %s\n",
 197                           fsp_fnum_dbg(fsp),
 198                           fsp_str_dbg(fsp),
 199                           (unsigned long)state->in_length,
 200                           (unsigned long)state->in_offset,
 201                           nt_errstr(status)));
 202
 203                 return status;
 204         }
 205
 206         DEBUG(3,("smb2: %s, file %s, "
 207                 "length=%lu offset=%lu wrote=%lu\n",
 208                 fsp_fnum_dbg(fsp),
 209                 fsp_str_dbg(fsp),
 210                 (unsigned long)state->in_length,
 211                 (unsigned long)state->in_offset,
 212                 (unsigned long)nwritten));
 213
 214         if ((nwritten == 0) && (state->in_length != 0)) {
 215                 DEBUG(5,("smb2: write [%s] disk full\n",
 216                         fsp_str_dbg(fsp)));
 217                 return NT_STATUS_DISK_FULL;
 218         }
 219
 220         if (do_sync) {
 221                 status = sync_file(fsp->conn, fsp, state->write_through);
 222                 if (!NT_STATUS_IS_OK(status)) {
 223                         DEBUG(5,("smb2: sync_file for %s returned %s\n",
 224                                  fsp_str_dbg(fsp),
 225                                  nt_errstr(status)));
 226                         return status;
 227                 }
 228         }
 229
 230         state->out_count = nwritten;
 231
 232         return NT_STATUS_OK;
 233 }
 234
 235 NTSTATUS smb2_write_complete(struct tevent_req *req, ssize_t nwritten, int err)
 236 {
 237         return smb2_write_complete_internal(req, nwritten, err, true);
 238 }
 239
 240 NTSTATUS smb2_write_complete_nosync(struct tevent_req *req, ssize_t nwritten,
 241                                     int err)
 242 {
 243         return smb2_write_complete_internal(req, nwritten, err, false);
 244 }
 245
 246
 247 static bool smbd_smb2_write_cancel(struct tevent_req *req)
 248 {
 249         struct smbd_smb2_write_state *state =
 250                 tevent_req_data(req,
 251                 struct smbd_smb2_write_state);
 252
 253         return cancel_smb2_aio(state->smbreq);
 254 }
 255
 256 static struct tevent_req *smbd_smb2_write_send(TALLOC_CTX *mem_ctx,
 257                                                struct tevent_context *ev,
 258                                                struct smbd_smb2_request *smb2req,
 259                                                struct files_struct *fsp,
 260                                                DATA_BLOB in_data,
 261                                                uint64_t in_offset,
 262                                                uint32_t in_flags)
 263 {
 264         NTSTATUS status;
 265         struct tevent_req *req = NULL;
 266         struct smbd_smb2_write_state *state = NULL;
 267         struct smb_request *smbreq = NULL;
 268         connection_struct *conn = smb2req->tcon->compat;
 269         ssize_t nwritten;
 270         struct lock_struct lock;
 271
 272         req = tevent_req_create(mem_ctx, &state,
 273                                 struct smbd_smb2_write_state);
 274         if (req == NULL) {
 275                 return NULL;
 276         }
 277         state->smb2req = smb2req;
 278         if (smb2req->xconn->protocol >= PROTOCOL_SMB3_02) {
 279                 if (in_flags & SMB2_WRITEFLAG_WRITE_UNBUFFERED) {
 280                         state->write_through = true;
 281                 }
 282         }
 283         if (in_flags & SMB2_WRITEFLAG_WRITE_THROUGH) {
 284                 state->write_through = true;
 285         }
 286         state->in_length = in_data.length;
 287         state->out_count = 0;
 288
 289         DEBUG(10,("smbd_smb2_write: %s - %s\n",
 290                   fsp_str_dbg(fsp), fsp_fnum_dbg(fsp)));
 291
 292         smbreq = smbd_smb2_fake_smb_request(smb2req);
 293         if (tevent_req_nomem(smbreq, req)) {
 294                 return tevent_req_post(req, ev);
 295         }
 296         state->smbreq = smbreq;
 297
 298         state->fsp = fsp;
 299
 300         if (IS_IPC(smbreq->conn)) {
 301                 struct tevent_req *subreq = NULL;
 302
 303                 if (!fsp_is_np(fsp)) {
 304                         tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 305                         return tevent_req_post(req, ev);
 306                 }
 307
 308                 subreq = np_write_send(state, ev,
 309                                        fsp->fake_file_handle,
 310                                        in_data.data,
 311                                        in_data.length);
 312                 if (tevent_req_nomem(subreq, req)) {
 313                         return tevent_req_post(req, ev);
 314                 }
 315                 tevent_req_set_callback(subreq,
 316                                         smbd_smb2_write_pipe_done,
 317                                         req);
 318                 return req;
 319         }
 320
 321         if (!CHECK_WRITE(fsp)) {
 322                 tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
 323                 return tevent_req_post(req, ev);
 324         }
 325
 326         /* Try and do an asynchronous write. */
 327         status = schedule_aio_smb2_write(conn,
 328                                         smbreq,
 329                                         fsp,
 330                                         in_offset,
 331                                         in_data,
 332                                         state->write_through);
 333
 334         if (NT_STATUS_IS_OK(status)) {
 335                 /*
 336                  * Doing an async write, allow this
 337                  * request to be canceled
 338                  */
 339                 tevent_req_set_cancel_fn(req, smbd_smb2_write_cancel);
 340                 return req;
 341         }
 342
 343         if (!NT_STATUS_EQUAL(status, NT_STATUS_RETRY)) {
 344                 /* Real error in setting up aio. Fail. */
 345                 tevent_req_nterror(req, status);
 346                 return tevent_req_post(req, ev);
 347         }
 348
 349         /* Fallback to synchronous. */
 350         init_strict_lock_struct(fsp,
 351                                 fsp->op->global->open_persistent_id,
 352                                 in_offset,
 353                                 in_data.length,
 354                                 WRITE_LOCK,
 355                                 &lock);
 356
 357         if (!SMB_VFS_STRICT_LOCK(conn, fsp, &lock)) {
 358                 tevent_req_nterror(req, NT_STATUS_FILE_LOCK_CONFLICT);
 359                 return tevent_req_post(req, ev);
 360         }
 361
 362         /*
 363          * Note: in_data.data is NULL for the recvfile case.
 364          */
 365         nwritten = write_file(smbreq, fsp,
 366                               (const char *)in_data.data,
 367                               in_offset,
 368                               in_data.length);
 369
 370         status = smb2_write_complete(req, nwritten, errno);
 371
 372         DEBUG(10,("smb2: write on "
 373                 "file %s, offset %.0f, requested %u, written = %u\n",
 374                 fsp_str_dbg(fsp),
 375                 (double)in_offset,
 376                 (unsigned int)in_data.length,
 377                 (unsigned int)nwritten ));
 378
 379         if (!NT_STATUS_IS_OK(status)) {
 380                 tevent_req_nterror(req, status);
 381         } else {
 382                 /* Success. */
 383                 tevent_req_done(req);
 384         }
 385
 386         return tevent_req_post(req, ev);
 387 }
 388
 389 static void smbd_smb2_write_pipe_done(struct tevent_req *subreq)
 390 {
 391         struct tevent_req *req = tevent_req_callback_data(subreq,
 392                                  struct tevent_req);
 393         struct smbd_smb2_write_state *state = tevent_req_data(req,
 394                                               struct smbd_smb2_write_state);
 395         NTSTATUS status;
 396         ssize_t nwritten = -1;
 397
 398         status = np_write_recv(subreq, &nwritten);
 399         TALLOC_FREE(subreq);
 400         if (!NT_STATUS_IS_OK(status)) {
 401                 NTSTATUS old = status;
 402                 status = nt_status_np_pipe(old);
 403                 tevent_req_nterror(req, status);
 404                 return;
 405         }
 406
 407         if ((nwritten == 0 && state->in_length != 0) || (nwritten < 0)) {
 408                 tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
 409                 return;
 410         }
 411
 412         state->out_count = nwritten;
 413
 414         tevent_req_done(req);
 415 }
 416
 417 static NTSTATUS smbd_smb2_write_recv(struct tevent_req *req,
 418                                      uint32_t *out_count)
 419 {
 420         NTSTATUS status;
 421         struct smbd_smb2_write_state *state = tevent_req_data(req,
 422                                               struct smbd_smb2_write_state);
 423
 424         if (tevent_req_is_nterror(req, &status)) {
 425                 tevent_req_received(req);
 426                 return status;
 427         }
 428
 429         *out_count = state->out_count;
 430
 431         tevent_req_received(req);
 432         return NT_STATUS_OK;
 433 }