source3/smbd/smb2_break.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Core SMB2 server
   4
   5    Copyright (C) Stefan Metzmacher 2009
   6    Copyright (C) Jeremy Allison 2010
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22 #include "includes.h"
  23 #include "smbd/globals.h"
  24 #include "../libcli/smb/smb_common.h"
  25
  26 static struct tevent_req *smbd_smb2_oplock_break_send(TALLOC_CTX *mem_ctx,
  27                                                       struct tevent_context *ev,
  28                                                       struct smbd_smb2_request *smb2req,
  29                                                       uint8_t in_oplock_level,
  30                                                       uint64_t in_file_id_volatile);
  31 static NTSTATUS smbd_smb2_oplock_break_recv(struct tevent_req *req,
  32                                             uint8_t *out_oplock_level);
  33
  34 static void smbd_smb2_request_oplock_break_done(struct tevent_req *subreq);
  35 NTSTATUS smbd_smb2_request_process_break(struct smbd_smb2_request *req)
  36 {
  37         const uint8_t *inhdr;
  38         const uint8_t *inbody;
  39         int i = req->current_idx;
  40         size_t expected_body_size = 0x18;
  41         size_t body_size;
  42         uint8_t in_oplock_level;
  43         uint64_t in_file_id_persistent;
  44         uint64_t in_file_id_volatile;
  45         struct tevent_req *subreq;
  46
  47         inhdr = (const uint8_t *)req->in.vector[i+0].iov_base;
  48         if (req->in.vector[i+1].iov_len != (expected_body_size & 0xFFFFFFFE)) {
  49                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  50         }
  51
  52         inbody = (const uint8_t *)req->in.vector[i+1].iov_base;
  53
  54         body_size = SVAL(inbody, 0x00);
  55         if (body_size != expected_body_size) {
  56                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  57         }
  58
  59         in_oplock_level         = CVAL(inbody, 0x02);
  60
  61         if (in_oplock_level != SMB2_OPLOCK_LEVEL_NONE &&
  62                         in_oplock_level != SMB2_OPLOCK_LEVEL_II) {
  63                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  64         }
  65
  66         /* 0x03 1 bytes reserved */
  67         /* 0x04 4 bytes reserved */
  68         in_file_id_persistent           = BVAL(inbody, 0x08);
  69         in_file_id_volatile             = BVAL(inbody, 0x10);
  70
  71         if (req->compat_chain_fsp) {
  72                 /* skip check */
  73         } else if (in_file_id_persistent != 0) {
  74                 return smbd_smb2_request_error(req, NT_STATUS_FILE_CLOSED);
  75         }
  76
  77         subreq = smbd_smb2_oplock_break_send(req,
  78                                              req->sconn->smb2.event_ctx,
  79                                              req,
  80                                              in_oplock_level,
  81                                              in_file_id_volatile);
  82         if (subreq == NULL) {
  83                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
  84         }
  85         tevent_req_set_callback(subreq, smbd_smb2_request_oplock_break_done, req);
  86
  87         return smbd_smb2_request_pending_queue(req, subreq);
  88 }
  89
  90 static void smbd_smb2_request_oplock_break_done(struct tevent_req *subreq)
  91 {
  92         struct smbd_smb2_request *req = tevent_req_callback_data(subreq,
  93                                         struct smbd_smb2_request);
  94         const uint8_t *inbody;
  95         int i = req->current_idx;
  96         uint64_t in_file_id_persistent;
  97         uint64_t in_file_id_volatile;
  98         uint8_t out_oplock_level = 0;
  99         DATA_BLOB outbody;
 100         NTSTATUS status;
 101         NTSTATUS error; /* transport error */
 102
 103         status = smbd_smb2_oplock_break_recv(subreq, &out_oplock_level);
 104         TALLOC_FREE(subreq);
 105         if (!NT_STATUS_IS_OK(status)) {
 106                 error = smbd_smb2_request_error(req, status);
 107                 if (!NT_STATUS_IS_OK(error)) {
 108                         smbd_server_connection_terminate(req->sconn,
 109                                                          nt_errstr(error));
 110                         return;
 111                 }
 112                 return;
 113         }
 114
 115         inbody = (const uint8_t *)req->in.vector[i+1].iov_base;
 116
 117         in_file_id_persistent   = BVAL(inbody, 0x08);
 118         in_file_id_volatile     = BVAL(inbody, 0x10);
 119
 120         outbody = data_blob_talloc(req->out.vector, NULL, 0x18);
 121         if (outbody.data == NULL) {
 122                 error = smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 123                 if (!NT_STATUS_IS_OK(error)) {
 124                         smbd_server_connection_terminate(req->sconn,
 125                                                          nt_errstr(error));
 126                         return;
 127                 }
 128                 return;
 129         }
 130
 131         SSVAL(outbody.data, 0x00, 0x18);        /* struct size */
 132         SCVAL(outbody.data, 0x02,
 133               out_oplock_level);                /* SMB2 oplock level */
 134         SCVAL(outbody.data, 0x03, 0);           /* reserved */
 135         SIVAL(outbody.data, 0x04, 0);           /* reserved */
 136         SBVAL(outbody.data, 0x08,
 137               in_file_id_persistent);           /* file id (persistent) */
 138         SBVAL(outbody.data, 0x10,
 139               in_file_id_volatile);             /* file id (volatile) */
 140
 141         error = smbd_smb2_request_done(req, outbody, NULL);
 142         if (!NT_STATUS_IS_OK(error)) {
 143                 smbd_server_connection_terminate(req->sconn,
 144                                                  nt_errstr(error));
 145                 return;
 146         }
 147 }
 148
 149 struct smbd_smb2_oplock_break_state {
 150         struct smbd_smb2_request *smb2req;
 151         uint8_t out_oplock_level; /* SMB2 oplock level. */
 152 };
 153
 154 static struct tevent_req *smbd_smb2_oplock_break_send(TALLOC_CTX *mem_ctx,
 155                                                       struct tevent_context *ev,
 156                                                       struct smbd_smb2_request *smb2req,
 157                                                       uint8_t in_oplock_level,
 158                                                       uint64_t in_file_id_volatile)
 159 {
 160         struct tevent_req *req;
 161         struct smbd_smb2_oplock_break_state *state;
 162         struct smb_request *smbreq;
 163         connection_struct *conn = smb2req->tcon->compat_conn;
 164         files_struct *fsp = NULL;
 165         int oplocklevel = map_smb2_oplock_levels_to_samba(in_oplock_level);
 166         bool break_to_none = (oplocklevel == NO_OPLOCK);
 167         bool result;
 168
 169         req = tevent_req_create(mem_ctx, &state,
 170                                 struct smbd_smb2_oplock_break_state);
 171         if (req == NULL) {
 172                 return NULL;
 173         }
 174         state->smb2req = smb2req;
 175         state->out_oplock_level = SMB2_OPLOCK_LEVEL_NONE;
 176
 177         DEBUG(10,("smbd_smb2_oplock_break_send: file_id[0x%016llX] "
 178                 "samba level %d\n",
 179                 (unsigned long long)in_file_id_volatile,
 180                 oplocklevel));
 181
 182         smbreq = smbd_smb2_fake_smb_request(smb2req);
 183         if (tevent_req_nomem(smbreq, req)) {
 184                 return tevent_req_post(req, ev);
 185         }
 186
 187         fsp = file_fsp(smbreq, (uint16_t)in_file_id_volatile);
 188         if (fsp == NULL) {
 189                 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 190                 return tevent_req_post(req, ev);
 191         }
 192         if (conn != fsp->conn) {
 193                 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 194                 return tevent_req_post(req, ev);
 195         }
 196         if (smb2req->session->vuid != fsp->vuid) {
 197                 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 198                 return tevent_req_post(req, ev);
 199         }
 200
 201         DEBUG(5,("smbd_smb2_oplock_break_send: got SMB2 oplock break (%u) from client "
 202                 "for file %s fnum = %d\n",
 203                 (unsigned int)in_oplock_level,
 204                 fsp_str_dbg(fsp),
 205                 fsp->fnum ));
 206
 207         if ((fsp->sent_oplock_break == BREAK_TO_NONE_SENT) ||
 208                         (break_to_none)) {
 209                 result = remove_oplock(fsp);
 210                 state->out_oplock_level = SMB2_OPLOCK_LEVEL_NONE;
 211         } else {
 212                 result = downgrade_oplock(fsp);
 213                 state->out_oplock_level = SMB2_OPLOCK_LEVEL_II;
 214         }
 215
 216         if (!result) {
 217                 DEBUG(0, ("smbd_smb2_oplock_break_send: error in removing "
 218                         "oplock on file %s\n", fsp_str_dbg(fsp)));
 219                 /* Hmmm. Is this panic justified? */
 220                 smb_panic("internal tdb error");
 221         }
 222
 223         reply_to_oplock_break_requests(fsp);
 224
 225         tevent_req_done(req);
 226         return tevent_req_post(req, ev);
 227 }
 228
 229 static NTSTATUS smbd_smb2_oplock_break_recv(struct tevent_req *req,
 230                                             uint8_t *out_oplock_level)
 231 {
 232         NTSTATUS status;
 233         struct smbd_smb2_oplock_break_state *state =
 234                 tevent_req_data(req,
 235                 struct smbd_smb2_oplock_break_state);
 236
 237         if (tevent_req_is_nterror(req, &status)) {
 238                 tevent_req_received(req);
 239                 return status;
 240         }
 241
 242         *out_oplock_level = state->out_oplock_level;
 243
 244         tevent_req_received(req);
 245         return NT_STATUS_OK;
 246 }
 247
 248 /*********************************************************
 249  Create and send an asynchronous
 250  SMB2 OPLOCK_BREAK_NOTIFICATION.
 251 *********************************************************/
 252
 253 void send_break_message_smb2(files_struct *fsp, int level)
 254 {
 255         uint8_t smb2_oplock_level = (level == OPLOCKLEVEL_II) ?
 256                                 SMB2_OPLOCK_LEVEL_II :
 257                                 SMB2_OPLOCK_LEVEL_NONE;
 258         NTSTATUS status;
 259
 260         DEBUG(10,("send_break_message_smb2: sending oplock break "
 261                 "for file %s, fnum = %d, smb2 level %u\n",
 262                 fsp_str_dbg(fsp),
 263                 fsp->fnum,
 264                 (unsigned int)smb2_oplock_level ));
 265
 266         status = smbd_smb2_send_oplock_break(fsp->conn->sconn,
 267                                         (uint64_t)fsp->fnum,
 268                                         smb2_oplock_level);
 269         if (!NT_STATUS_IS_OK(status)) {
 270                 smbd_server_connection_terminate(fsp->conn->sconn,
 271                                  nt_errstr(status));
 272         }
 273 }