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
  27 static struct tevent_req *smbd_smb2_write_send(TALLOC_CTX *mem_ctx,
  28                                                struct tevent_context *ev,
  29                                                struct smbd_smb2_request *smb2req,
  30                                                uint32_t in_smbpid,
  31                                                uint64_t in_file_id_volatile,
  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         const uint8_t *inhdr;
  42         const uint8_t *inbody;
  43         int i = req->current_idx;
  44         size_t expected_body_size = 0x31;
  45         size_t body_size;
  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         inhdr = (const uint8_t *)req->in.vector[i+0].iov_base;
  57         if (req->in.vector[i+1].iov_len != (expected_body_size & 0xFFFFFFFE)) {
  58                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  59         }
  60
  61         inbody = (const uint8_t *)req->in.vector[i+1].iov_base;
  62
  63         body_size = SVAL(inbody, 0x00);
  64         if (body_size != expected_body_size) {
  65                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  66         }
  67
  68         in_smbpid = IVAL(inhdr, SMB2_HDR_PID);
  69
  70         in_data_offset          = SVAL(inbody, 0x02);
  71         in_data_length          = IVAL(inbody, 0x04);
  72         in_offset               = BVAL(inbody, 0x08);
  73         in_file_id_persistent   = BVAL(inbody, 0x10);
  74         in_file_id_volatile     = BVAL(inbody, 0x18);
  75         in_flags                = IVAL(inbody, 0x2C);
  76
  77         if (in_data_offset != (SMB2_HDR_BODY + (body_size & 0xFFFFFFFE))) {
  78                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  79         }
  80
  81         if (in_data_length > req->in.vector[i+2].iov_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 > lp_smb2_max_write()) {
  87                 /* This is a warning. */
  88                 DEBUG(2,("smbd_smb2_request_process_write : "
  89                         "client ignored max write :%s: 0x%08X: 0x%08X\n",
  90                         __location__, in_data_length, lp_smb2_max_write()));
  91 #if 0
  92                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  93 #endif
  94         }
  95
  96         in_data_buffer.data = (uint8_t *)req->in.vector[i+2].iov_base;
  97         in_data_buffer.length = in_data_length;
  98
  99         if (req->compat_chain_fsp) {
 100                 /* skip check */
 101         } else if (in_file_id_persistent != in_file_id_volatile) {
 102                 return smbd_smb2_request_error(req, NT_STATUS_FILE_CLOSED);
 103         }
 104
 105         subreq = smbd_smb2_write_send(req,
 106                                       req->sconn->smb2.event_ctx,
 107                                       req,
 108                                       in_smbpid,
 109                                       in_file_id_volatile,
 110                                       in_data_buffer,
 111                                       in_offset,
 112                                       in_flags);
 113         if (subreq == NULL) {
 114                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 115         }
 116         tevent_req_set_callback(subreq, smbd_smb2_request_write_done, req);
 117
 118         return smbd_smb2_request_pending_queue(req, subreq);
 119 }
 120
 121 static void smbd_smb2_request_write_done(struct tevent_req *subreq)
 122 {
 123         struct smbd_smb2_request *req = tevent_req_callback_data(subreq,
 124                                         struct smbd_smb2_request);
 125         int i = req->current_idx;
 126         uint8_t *outhdr;
 127         DATA_BLOB outbody;
 128         DATA_BLOB outdyn;
 129         uint32_t out_count = 0;
 130         NTSTATUS status;
 131         NTSTATUS error; /* transport error */
 132
 133         status = smbd_smb2_write_recv(subreq, &out_count);
 134         TALLOC_FREE(subreq);
 135         if (!NT_STATUS_IS_OK(status)) {
 136                 error = smbd_smb2_request_error(req, status);
 137                 if (!NT_STATUS_IS_OK(error)) {
 138                         smbd_server_connection_terminate(req->sconn,
 139                                                          nt_errstr(error));
 140                         return;
 141                 }
 142                 return;
 143         }
 144
 145         outhdr = (uint8_t *)req->out.vector[i].iov_base;
 146
 147         outbody = data_blob_talloc(req->out.vector, NULL, 0x10);
 148         if (outbody.data == NULL) {
 149                 error = smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 150                 if (!NT_STATUS_IS_OK(error)) {
 151                         smbd_server_connection_terminate(req->sconn,
 152                                                          nt_errstr(error));
 153                         return;
 154                 }
 155                 return;
 156         }
 157
 158         SSVAL(outbody.data, 0x00, 0x10 + 1);    /* struct size */
 159         SSVAL(outbody.data, 0x02, 0);           /* reserved */
 160         SIVAL(outbody.data, 0x04, out_count);   /* count */
 161         SIVAL(outbody.data, 0x08, 0);           /* remaining */
 162         SSVAL(outbody.data, 0x0C, 0);           /* write channel info offset */
 163         SSVAL(outbody.data, 0x0E, 0);           /* write channel info length */
 164
 165         outdyn = data_blob_const(NULL, 0);
 166
 167         error = smbd_smb2_request_done(req, outbody, &outdyn);
 168         if (!NT_STATUS_IS_OK(error)) {
 169                 smbd_server_connection_terminate(req->sconn, nt_errstr(error));
 170                 return;
 171         }
 172 }
 173
 174 struct smbd_smb2_write_state {
 175         struct smbd_smb2_request *smb2req;
 176         files_struct *fsp;
 177         bool write_through;
 178         uint32_t in_length;
 179         uint64_t in_offset;
 180         uint32_t out_count;
 181 };
 182
 183 static void smbd_smb2_write_pipe_done(struct tevent_req *subreq);
 184
 185 NTSTATUS smb2_write_complete(struct tevent_req *req, ssize_t nwritten, int err)
 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         DEBUG(3,("smb2: fnum=[%d/%s] "
 193                 "length=%lu offset=%lu wrote=%lu\n",
 194                 fsp->fnum,
 195                 fsp_str_dbg(fsp),
 196                 (unsigned long)state->in_length,
 197                 (unsigned long)state->in_offset,
 198                 (unsigned long)nwritten));
 199
 200         if (nwritten == -1) {
 201                 return map_nt_error_from_unix(err);
 202         }
 203
 204         if ((nwritten == 0) && (state->in_length != 0)) {
 205                 DEBUG(5,("smb2: write [%s] disk full\n",
 206                         fsp_str_dbg(fsp)));
 207                 return NT_STATUS_DISK_FULL;
 208         }
 209
 210         status = sync_file(fsp->conn, fsp, state->write_through);
 211         if (!NT_STATUS_IS_OK(status)) {
 212                 DEBUG(5,("smb2: sync_file for %s returned %s\n",
 213                         fsp_str_dbg(fsp),
 214                         nt_errstr(status)));
 215                 return status;
 216         }
 217
 218         state->out_count = nwritten;
 219
 220         return NT_STATUS_OK;
 221 }
 222
 223 static struct tevent_req *smbd_smb2_write_send(TALLOC_CTX *mem_ctx,
 224                                                struct tevent_context *ev,
 225                                                struct smbd_smb2_request *smb2req,
 226                                                uint32_t in_smbpid,
 227                                                uint64_t in_file_id_volatile,
 228                                                DATA_BLOB in_data,
 229                                                uint64_t in_offset,
 230                                                uint32_t in_flags)
 231 {
 232         NTSTATUS status;
 233         struct tevent_req *req = NULL;
 234         struct smbd_smb2_write_state *state = NULL;
 235         struct smb_request *smbreq = NULL;
 236         connection_struct *conn = smb2req->tcon->compat_conn;
 237         files_struct *fsp = NULL;
 238         ssize_t nwritten;
 239         struct lock_struct lock;
 240
 241         req = tevent_req_create(mem_ctx, &state,
 242                                 struct smbd_smb2_write_state);
 243         if (req == NULL) {
 244                 return NULL;
 245         }
 246         state->smb2req = smb2req;
 247         if (in_flags & 0x00000001) {
 248                 state->write_through = true;
 249         }
 250         state->in_length = in_data.length;
 251         state->out_count = 0;
 252
 253         DEBUG(10,("smbd_smb2_write: file_id[0x%016llX]\n",
 254                   (unsigned long long)in_file_id_volatile));
 255
 256         smbreq = smbd_smb2_fake_smb_request(smb2req);
 257         if (tevent_req_nomem(smbreq, req)) {
 258                 return tevent_req_post(req, ev);
 259         }
 260
 261         fsp = file_fsp(smbreq, (uint16_t)in_file_id_volatile);
 262         if (fsp == NULL) {
 263                 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 264                 return tevent_req_post(req, ev);
 265         }
 266         if (conn != fsp->conn) {
 267                 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 268                 return tevent_req_post(req, ev);
 269         }
 270         if (smb2req->session->vuid != fsp->vuid) {
 271                 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 272                 return tevent_req_post(req, ev);
 273         }
 274
 275         state->fsp = fsp;
 276
 277         if (IS_IPC(smbreq->conn)) {
 278                 struct tevent_req *subreq = NULL;
 279
 280                 if (!fsp_is_np(fsp)) {
 281                         tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 282                         return tevent_req_post(req, ev);
 283                 }
 284
 285                 subreq = np_write_send(state, smbd_event_context(),
 286                                        fsp->fake_file_handle,
 287                                        in_data.data,
 288                                        in_data.length);
 289                 if (tevent_req_nomem(subreq, req)) {
 290                         return tevent_req_post(req, ev);
 291                 }
 292                 tevent_req_set_callback(subreq,
 293                                         smbd_smb2_write_pipe_done,
 294                                         req);
 295                 return req;
 296         }
 297
 298         if (!CHECK_WRITE(fsp)) {
 299                 tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
 300                 return tevent_req_post(req, ev);
 301         }
 302
 303         /* Try and do an asynchronous write. */
 304         status = schedule_aio_smb2_write(conn,
 305                                         smbreq,
 306                                         fsp,
 307                                         in_offset,
 308                                         in_data,
 309                                         state->write_through);
 310
 311         if (NT_STATUS_IS_OK(status)) {
 312                 /*
 313                  * Doing an async write. Don't
 314                  * send a "gone async" message
 315                  * as we expect this to be less
 316                  * than the client timeout period.
 317                  * JRA. FIXME for offline files..
 318                  * FIXME - add cancel code..
 319                  */
 320                 smb2req->async = true;
 321                 return req;
 322         }
 323
 324         if (!NT_STATUS_EQUAL(status, NT_STATUS_RETRY)) {
 325                 /* Real error in setting up aio. Fail. */
 326                 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 327                 return tevent_req_post(req, ev);
 328         }
 329
 330         /* Fallback to synchronous. */
 331         init_strict_lock_struct(fsp,
 332                                 in_file_id_volatile,
 333                                 in_offset,
 334                                 in_data.length,
 335                                 WRITE_LOCK,
 336                                 &lock);
 337
 338         if (!SMB_VFS_STRICT_LOCK(conn, fsp, &lock)) {
 339                 tevent_req_nterror(req, NT_STATUS_FILE_LOCK_CONFLICT);
 340                 return tevent_req_post(req, ev);
 341         }
 342
 343         nwritten = write_file(smbreq, fsp,
 344                               (const char *)in_data.data,
 345                               in_offset,
 346                               in_data.length);
 347
 348         status = smb2_write_complete(req, nwritten, errno);
 349
 350         SMB_VFS_STRICT_UNLOCK(conn, fsp, &lock);
 351
 352         DEBUG(10,("smb2: write on "
 353                 "file %s, offset %.0f, requested %u, written = %u\n",
 354                 fsp_str_dbg(fsp),
 355                 (double)in_offset,
 356                 (unsigned int)in_data.length,
 357                 (unsigned int)nwritten ));
 358
 359         if (!NT_STATUS_IS_OK(status)) {
 360                 tevent_req_nterror(req, status);
 361         } else {
 362                 /* Success. */
 363                 tevent_req_done(req);
 364         }
 365
 366         return tevent_req_post(req, ev);
 367 }
 368
 369 static void smbd_smb2_write_pipe_done(struct tevent_req *subreq)
 370 {
 371         struct tevent_req *req = tevent_req_callback_data(subreq,
 372                                  struct tevent_req);
 373         struct smbd_smb2_write_state *state = tevent_req_data(req,
 374                                               struct smbd_smb2_write_state);
 375         NTSTATUS status;
 376         ssize_t nwritten = -1;
 377
 378         status = np_write_recv(subreq, &nwritten);
 379         TALLOC_FREE(subreq);
 380         if (!NT_STATUS_IS_OK(status)) {
 381                 tevent_req_nterror(req, status);
 382                 return;
 383         }
 384
 385         if ((nwritten == 0 && state->in_length != 0) || (nwritten < 0)) {
 386                 tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
 387                 return;
 388         }
 389
 390         state->out_count = nwritten;
 391
 392         tevent_req_done(req);
 393 }
 394
 395 static NTSTATUS smbd_smb2_write_recv(struct tevent_req *req,
 396                                      uint32_t *out_count)
 397 {
 398         NTSTATUS status;
 399         struct smbd_smb2_write_state *state = tevent_req_data(req,
 400                                               struct smbd_smb2_write_state);
 401
 402         if (tevent_req_is_nterror(req, &status)) {
 403                 tevent_req_received(req);
 404                 return status;
 405         }
 406
 407         *out_count = state->out_count;
 408
 409         tevent_req_received(req);
 410         return NT_STATUS_OK;
 411 }