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         status = smbd_smb2_request_verify_creditcharge(req, in_data_length);
  92         if (!NT_STATUS_IS_OK(status)) {
  93                 return smbd_smb2_request_error(req, status);
  94         }
  95
  96         if (req->compat_chain_fsp) {
  97                 /* skip check */
  98         } else if (in_file_id_persistent != in_file_id_volatile) {
  99                 return smbd_smb2_request_error(req, NT_STATUS_FILE_CLOSED);
 100         }
 101
 102         subreq = smbd_smb2_write_send(req,
 103                                       req->sconn->ev_ctx,
 104                                       req,
 105                                       in_smbpid,
 106                                       in_file_id_volatile,
 107                                       in_data_buffer,
 108                                       in_offset,
 109                                       in_flags);
 110         if (subreq == NULL) {
 111                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 112         }
 113         tevent_req_set_callback(subreq, smbd_smb2_request_write_done, req);
 114
 115         return smbd_smb2_request_pending_queue(req, subreq, 500);
 116 }
 117
 118 static void smbd_smb2_request_write_done(struct tevent_req *subreq)
 119 {
 120         struct smbd_smb2_request *req = tevent_req_callback_data(subreq,
 121                                         struct smbd_smb2_request);
 122         DATA_BLOB outbody;
 123         DATA_BLOB outdyn;
 124         uint32_t out_count = 0;
 125         NTSTATUS status;
 126         NTSTATUS error; /* transport error */
 127
 128         status = smbd_smb2_write_recv(subreq, &out_count);
 129         TALLOC_FREE(subreq);
 130         if (!NT_STATUS_IS_OK(status)) {
 131                 error = smbd_smb2_request_error(req, status);
 132                 if (!NT_STATUS_IS_OK(error)) {
 133                         smbd_server_connection_terminate(req->sconn,
 134                                                          nt_errstr(error));
 135                         return;
 136                 }
 137                 return;
 138         }
 139
 140         outbody = data_blob_talloc(req->out.vector, NULL, 0x10);
 141         if (outbody.data == NULL) {
 142                 error = smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 143                 if (!NT_STATUS_IS_OK(error)) {
 144                         smbd_server_connection_terminate(req->sconn,
 145                                                          nt_errstr(error));
 146                         return;
 147                 }
 148                 return;
 149         }
 150
 151         SSVAL(outbody.data, 0x00, 0x10 + 1);    /* struct size */
 152         SSVAL(outbody.data, 0x02, 0);           /* reserved */
 153         SIVAL(outbody.data, 0x04, out_count);   /* count */
 154         SIVAL(outbody.data, 0x08, 0);           /* remaining */
 155         SSVAL(outbody.data, 0x0C, 0);           /* write channel info offset */
 156         SSVAL(outbody.data, 0x0E, 0);           /* write channel info length */
 157
 158         outdyn = data_blob_const(NULL, 0);
 159
 160         error = smbd_smb2_request_done(req, outbody, &outdyn);
 161         if (!NT_STATUS_IS_OK(error)) {
 162                 smbd_server_connection_terminate(req->sconn, nt_errstr(error));
 163                 return;
 164         }
 165 }
 166
 167 struct smbd_smb2_write_state {
 168         struct smbd_smb2_request *smb2req;
 169         struct smb_request *smbreq;
 170         files_struct *fsp;
 171         bool write_through;
 172         uint32_t in_length;
 173         uint64_t in_offset;
 174         uint32_t out_count;
 175 };
 176
 177 static void smbd_smb2_write_pipe_done(struct tevent_req *subreq);
 178
 179 NTSTATUS smb2_write_complete(struct tevent_req *req, ssize_t nwritten, int err)
 180 {
 181         NTSTATUS status;
 182         struct smbd_smb2_write_state *state = tevent_req_data(req,
 183                                         struct smbd_smb2_write_state);
 184         files_struct *fsp = state->fsp;
 185
 186         if (nwritten == -1) {
 187                 status = map_nt_error_from_unix(err);
 188
 189                 DEBUG(2, ("smb2_write failed: fnum=[%d/%s] "
 190                           "length=%lu offset=%lu nwritten=-1: %s\n",
 191                           fsp->fnum,
 192                           fsp_str_dbg(fsp),
 193                           (unsigned long)state->in_length,
 194                           (unsigned long)state->in_offset,
 195                           nt_errstr(status)));
 196
 197                 return status;
 198         }
 199
 200         DEBUG(3,("smb2: fnum=[%d/%s] "
 201                 "length=%lu offset=%lu wrote=%lu\n",
 202                 fsp->fnum,
 203                 fsp_str_dbg(fsp),
 204                 (unsigned long)state->in_length,
 205                 (unsigned long)state->in_offset,
 206                 (unsigned long)nwritten));
 207
 208         if ((nwritten == 0) && (state->in_length != 0)) {
 209                 DEBUG(5,("smb2: write [%s] disk full\n",
 210                         fsp_str_dbg(fsp)));
 211                 return NT_STATUS_DISK_FULL;
 212         }
 213
 214         status = sync_file(fsp->conn, fsp, state->write_through);
 215         if (!NT_STATUS_IS_OK(status)) {
 216                 DEBUG(5,("smb2: sync_file for %s returned %s\n",
 217                         fsp_str_dbg(fsp),
 218                         nt_errstr(status)));
 219                 return status;
 220         }
 221
 222         state->out_count = nwritten;
 223
 224         return NT_STATUS_OK;
 225 }
 226
 227 static bool smbd_smb2_write_cancel(struct tevent_req *req)
 228 {
 229         struct smbd_smb2_write_state *state =
 230                 tevent_req_data(req,
 231                 struct smbd_smb2_write_state);
 232
 233         state->smb2req->cancelled = true;
 234
 235         return cancel_smb2_aio(state->smbreq);
 236 }
 237
 238 static struct tevent_req *smbd_smb2_write_send(TALLOC_CTX *mem_ctx,
 239                                                struct tevent_context *ev,
 240                                                struct smbd_smb2_request *smb2req,
 241                                                uint32_t in_smbpid,
 242                                                uint64_t in_file_id_volatile,
 243                                                DATA_BLOB in_data,
 244                                                uint64_t in_offset,
 245                                                uint32_t in_flags)
 246 {
 247         NTSTATUS status;
 248         struct tevent_req *req = NULL;
 249         struct smbd_smb2_write_state *state = NULL;
 250         struct smb_request *smbreq = NULL;
 251         connection_struct *conn = smb2req->tcon->compat_conn;
 252         files_struct *fsp = NULL;
 253         ssize_t nwritten;
 254         struct lock_struct lock;
 255
 256         req = tevent_req_create(mem_ctx, &state,
 257                                 struct smbd_smb2_write_state);
 258         if (req == NULL) {
 259                 return NULL;
 260         }
 261         state->smb2req = smb2req;
 262         if (in_flags & SMB2_WRITEFLAG_WRITE_THROUGH) {
 263                 state->write_through = true;
 264         }
 265         state->in_length = in_data.length;
 266         state->out_count = 0;
 267
 268         DEBUG(10,("smbd_smb2_write: file_id[0x%016llX]\n",
 269                   (unsigned long long)in_file_id_volatile));
 270
 271         smbreq = smbd_smb2_fake_smb_request(smb2req);
 272         if (tevent_req_nomem(smbreq, req)) {
 273                 return tevent_req_post(req, ev);
 274         }
 275         state->smbreq = smbreq;
 276
 277         fsp = file_fsp(smbreq, (uint16_t)in_file_id_volatile);
 278         if (fsp == NULL) {
 279                 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 280                 return tevent_req_post(req, ev);
 281         }
 282         if (conn != fsp->conn) {
 283                 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 284                 return tevent_req_post(req, ev);
 285         }
 286         if (smb2req->session->vuid != fsp->vuid) {
 287                 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 288                 return tevent_req_post(req, ev);
 289         }
 290
 291         state->fsp = fsp;
 292
 293         if (IS_IPC(smbreq->conn)) {
 294                 struct tevent_req *subreq = NULL;
 295
 296                 if (!fsp_is_np(fsp)) {
 297                         tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 298                         return tevent_req_post(req, ev);
 299                 }
 300
 301                 subreq = np_write_send(state, ev,
 302                                        fsp->fake_file_handle,
 303                                        in_data.data,
 304                                        in_data.length);
 305                 if (tevent_req_nomem(subreq, req)) {
 306                         return tevent_req_post(req, ev);
 307                 }
 308                 tevent_req_set_callback(subreq,
 309                                         smbd_smb2_write_pipe_done,
 310                                         req);
 311                 return req;
 312         }
 313
 314         if (!CHECK_WRITE(fsp)) {
 315                 tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
 316                 return tevent_req_post(req, ev);
 317         }
 318
 319         /* Try and do an asynchronous write. */
 320         status = schedule_aio_smb2_write(conn,
 321                                         smbreq,
 322                                         fsp,
 323                                         in_offset,
 324                                         in_data,
 325                                         state->write_through);
 326
 327         if (NT_STATUS_IS_OK(status)) {
 328                 /*
 329                  * Doing an async write, allow this
 330                  * request to be canceled
 331                  */
 332                 tevent_req_set_cancel_fn(req, smbd_smb2_write_cancel);
 333                 return req;
 334         }
 335
 336         if (!NT_STATUS_EQUAL(status, NT_STATUS_RETRY)) {
 337                 /* Real error in setting up aio. Fail. */
 338                 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 339                 return tevent_req_post(req, ev);
 340         }
 341
 342         /* Fallback to synchronous. */
 343         init_strict_lock_struct(fsp,
 344                                 in_file_id_volatile,
 345                                 in_offset,
 346                                 in_data.length,
 347                                 WRITE_LOCK,
 348                                 &lock);
 349
 350         if (!SMB_VFS_STRICT_LOCK(conn, fsp, &lock)) {
 351                 tevent_req_nterror(req, NT_STATUS_FILE_LOCK_CONFLICT);
 352                 return tevent_req_post(req, ev);
 353         }
 354
 355         nwritten = write_file(smbreq, fsp,
 356                               (const char *)in_data.data,
 357                               in_offset,
 358                               in_data.length);
 359
 360         status = smb2_write_complete(req, nwritten, errno);
 361
 362         SMB_VFS_STRICT_UNLOCK(conn, fsp, &lock);
 363
 364         DEBUG(10,("smb2: write on "
 365                 "file %s, offset %.0f, requested %u, written = %u\n",
 366                 fsp_str_dbg(fsp),
 367                 (double)in_offset,
 368                 (unsigned int)in_data.length,
 369                 (unsigned int)nwritten ));
 370
 371         if (!NT_STATUS_IS_OK(status)) {
 372                 tevent_req_nterror(req, status);
 373         } else {
 374                 /* Success. */
 375                 tevent_req_done(req);
 376         }
 377
 378         return tevent_req_post(req, ev);
 379 }
 380
 381 static void smbd_smb2_write_pipe_done(struct tevent_req *subreq)
 382 {
 383         struct tevent_req *req = tevent_req_callback_data(subreq,
 384                                  struct tevent_req);
 385         struct smbd_smb2_write_state *state = tevent_req_data(req,
 386                                               struct smbd_smb2_write_state);
 387         NTSTATUS status;
 388         ssize_t nwritten = -1;
 389
 390         status = np_write_recv(subreq, &nwritten);
 391         TALLOC_FREE(subreq);
 392         if (!NT_STATUS_IS_OK(status)) {
 393                 tevent_req_nterror(req, status);
 394                 return;
 395         }
 396
 397         if ((nwritten == 0 && state->in_length != 0) || (nwritten < 0)) {
 398                 tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
 399                 return;
 400         }
 401
 402         state->out_count = nwritten;
 403
 404         tevent_req_done(req);
 405 }
 406
 407 static NTSTATUS smbd_smb2_write_recv(struct tevent_req *req,
 408                                      uint32_t *out_count)
 409 {
 410         NTSTATUS status;
 411         struct smbd_smb2_write_state *state = tevent_req_data(req,
 412                                               struct smbd_smb2_write_state);
 413
 414         if (tevent_req_is_nterror(req, &status)) {
 415                 tevent_req_received(req);
 416                 return status;
 417         }
 418
 419         *out_count = state->out_count;
 420
 421         tevent_req_received(req);
 422         return NT_STATUS_OK;
 423 }