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/smbd.h"
  24 #include "smbd/globals.h"
  25 #include "../libcli/smb/smb_common.h"
  26 #include "../lib/util/tevent_ntstatus.h"
  27
  28 static struct tevent_req *smbd_smb2_oplock_break_send(TALLOC_CTX *mem_ctx,
  29                                                       struct tevent_context *ev,
  30                                                       struct smbd_smb2_request *smb2req,
  31                                                       uint8_t in_oplock_level,
  32                                                       uint64_t in_file_id_volatile);
  33 static NTSTATUS smbd_smb2_oplock_break_recv(struct tevent_req *req,
  34                                             uint8_t *out_oplock_level);
  35
  36 static void smbd_smb2_request_oplock_break_done(struct tevent_req *subreq);
  37 NTSTATUS smbd_smb2_request_process_break(struct smbd_smb2_request *req)
  38 {
  39         NTSTATUS status;
  40         const uint8_t *inbody;
  41         int i = req->current_idx;
  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         status = smbd_smb2_request_verify_sizes(req, 0x18);
  48         if (!NT_STATUS_IS_OK(status)) {
  49                 return smbd_smb2_request_error(req, status);
  50         }
  51         inbody = (const uint8_t *)req->in.vector[i+1].iov_base;
  52
  53         in_oplock_level         = CVAL(inbody, 0x02);
  54
  55         if (in_oplock_level != SMB2_OPLOCK_LEVEL_NONE &&
  56                         in_oplock_level != SMB2_OPLOCK_LEVEL_II) {
  57                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  58         }
  59
  60         /* 0x03 1 bytes reserved */
  61         /* 0x04 4 bytes reserved */
  62         in_file_id_persistent           = BVAL(inbody, 0x08);
  63         in_file_id_volatile             = BVAL(inbody, 0x10);
  64
  65         if (req->compat_chain_fsp) {
  66                 /* skip check */
  67         } else if (in_file_id_persistent != in_file_id_volatile) {
  68                 return smbd_smb2_request_error(req, NT_STATUS_FILE_CLOSED);
  69         }
  70
  71         subreq = smbd_smb2_oplock_break_send(req,
  72                                              req->sconn->ev_ctx,
  73                                              req,
  74                                              in_oplock_level,
  75                                              in_file_id_volatile);
  76         if (subreq == NULL) {
  77                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
  78         }
  79         tevent_req_set_callback(subreq, smbd_smb2_request_oplock_break_done, req);
  80
  81         return smbd_smb2_request_pending_queue(req, subreq, 500);
  82 }
  83
  84 static void smbd_smb2_request_oplock_break_done(struct tevent_req *subreq)
  85 {
  86         struct smbd_smb2_request *req = tevent_req_callback_data(subreq,
  87                                         struct smbd_smb2_request);
  88         const uint8_t *inbody;
  89         int i = req->current_idx;
  90         uint64_t in_file_id_persistent;
  91         uint64_t in_file_id_volatile;
  92         uint8_t out_oplock_level = 0;
  93         DATA_BLOB outbody;
  94         NTSTATUS status;
  95         NTSTATUS error; /* transport error */
  96
  97         status = smbd_smb2_oplock_break_recv(subreq, &out_oplock_level);
  98         TALLOC_FREE(subreq);
  99         if (!NT_STATUS_IS_OK(status)) {
 100                 error = smbd_smb2_request_error(req, status);
 101                 if (!NT_STATUS_IS_OK(error)) {
 102                         smbd_server_connection_terminate(req->sconn,
 103                                                          nt_errstr(error));
 104                         return;
 105                 }
 106                 return;
 107         }
 108
 109         inbody = (const uint8_t *)req->in.vector[i+1].iov_base;
 110
 111         in_file_id_persistent   = BVAL(inbody, 0x08);
 112         in_file_id_volatile     = BVAL(inbody, 0x10);
 113
 114         outbody = data_blob_talloc(req->out.vector, NULL, 0x18);
 115         if (outbody.data == NULL) {
 116                 error = smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 117                 if (!NT_STATUS_IS_OK(error)) {
 118                         smbd_server_connection_terminate(req->sconn,
 119                                                          nt_errstr(error));
 120                         return;
 121                 }
 122                 return;
 123         }
 124
 125         SSVAL(outbody.data, 0x00, 0x18);        /* struct size */
 126         SCVAL(outbody.data, 0x02,
 127               out_oplock_level);                /* SMB2 oplock level */
 128         SCVAL(outbody.data, 0x03, 0);           /* reserved */
 129         SIVAL(outbody.data, 0x04, 0);           /* reserved */
 130         SBVAL(outbody.data, 0x08,
 131               in_file_id_persistent);           /* file id (persistent) */
 132         SBVAL(outbody.data, 0x10,
 133               in_file_id_volatile);             /* file id (volatile) */
 134
 135         error = smbd_smb2_request_done(req, outbody, NULL);
 136         if (!NT_STATUS_IS_OK(error)) {
 137                 smbd_server_connection_terminate(req->sconn,
 138                                                  nt_errstr(error));
 139                 return;
 140         }
 141 }
 142
 143 struct smbd_smb2_oplock_break_state {
 144         struct smbd_smb2_request *smb2req;
 145         uint8_t out_oplock_level; /* SMB2 oplock level. */
 146 };
 147
 148 static struct tevent_req *smbd_smb2_oplock_break_send(TALLOC_CTX *mem_ctx,
 149                                                       struct tevent_context *ev,
 150                                                       struct smbd_smb2_request *smb2req,
 151                                                       uint8_t in_oplock_level,
 152                                                       uint64_t in_file_id_volatile)
 153 {
 154         struct tevent_req *req;
 155         struct smbd_smb2_oplock_break_state *state;
 156         struct smb_request *smbreq;
 157         connection_struct *conn = smb2req->tcon->compat_conn;
 158         files_struct *fsp = NULL;
 159         int oplocklevel = map_smb2_oplock_levels_to_samba(in_oplock_level);
 160         bool break_to_none = (oplocklevel == NO_OPLOCK);
 161         bool result;
 162
 163         req = tevent_req_create(mem_ctx, &state,
 164                                 struct smbd_smb2_oplock_break_state);
 165         if (req == NULL) {
 166                 return NULL;
 167         }
 168         state->smb2req = smb2req;
 169         state->out_oplock_level = SMB2_OPLOCK_LEVEL_NONE;
 170
 171         DEBUG(10,("smbd_smb2_oplock_break_send: file_id[0x%016llX] "
 172                 "samba level %d\n",
 173                 (unsigned long long)in_file_id_volatile,
 174                 oplocklevel));
 175
 176         smbreq = smbd_smb2_fake_smb_request(smb2req);
 177         if (tevent_req_nomem(smbreq, req)) {
 178                 return tevent_req_post(req, ev);
 179         }
 180
 181         fsp = file_fsp(smbreq, (uint16_t)in_file_id_volatile);
 182         if (fsp == NULL) {
 183                 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 184                 return tevent_req_post(req, ev);
 185         }
 186         if (conn != fsp->conn) {
 187                 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 188                 return tevent_req_post(req, ev);
 189         }
 190         if (smb2req->session->vuid != fsp->vuid) {
 191                 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 192                 return tevent_req_post(req, ev);
 193         }
 194
 195         DEBUG(5,("smbd_smb2_oplock_break_send: got SMB2 oplock break (%u) from client "
 196                 "for file %s fnum = %d\n",
 197                 (unsigned int)in_oplock_level,
 198                 fsp_str_dbg(fsp),
 199                 fsp->fnum ));
 200
 201         /* Are we awaiting a break message ? */
 202         if (fsp->oplock_timeout == NULL) {
 203                 tevent_req_nterror(req, NT_STATUS_INVALID_OPLOCK_PROTOCOL);
 204                 return tevent_req_post(req, ev);
 205         }
 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                                         (uint64_t)fsp->fnum,
 269                                         smb2_oplock_level);
 270         if (!NT_STATUS_IS_OK(status)) {
 271                 smbd_server_connection_terminate(fsp->conn->sconn,
 272                                  nt_errstr(status));
 273         }
 274 }