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