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         const uint8_t *inhdr;
  40         const uint8_t *inbody;
  41         int i = req->current_idx;
  42         size_t expected_body_size = 0x18;
  43         size_t body_size;
  44         uint8_t in_oplock_level;
  45         uint64_t in_file_id_persistent;
  46         uint64_t in_file_id_volatile;
  47         struct tevent_req *subreq;
  48
  49         inhdr = (const uint8_t *)req->in.vector[i+0].iov_base;
  50         if (req->in.vector[i+1].iov_len != (expected_body_size & 0xFFFFFFFE)) {
  51                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  52         }
  53
  54         inbody = (const uint8_t *)req->in.vector[i+1].iov_base;
  55
  56         body_size = SVAL(inbody, 0x00);
  57         if (body_size != expected_body_size) {
  58                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  59         }
  60
  61         in_oplock_level         = CVAL(inbody, 0x02);
  62
  63         if (in_oplock_level != SMB2_OPLOCK_LEVEL_NONE &&
  64                         in_oplock_level != SMB2_OPLOCK_LEVEL_II) {
  65                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  66         }
  67
  68         /* 0x03 1 bytes reserved */
  69         /* 0x04 4 bytes reserved */
  70         in_file_id_persistent           = BVAL(inbody, 0x08);
  71         in_file_id_volatile             = BVAL(inbody, 0x10);
  72
  73         if (req->compat_chain_fsp) {
  74                 /* skip check */
  75         } else if (in_file_id_persistent != in_file_id_volatile) {
  76                 return smbd_smb2_request_error(req, NT_STATUS_FILE_CLOSED);
  77         }
  78
  79         subreq = smbd_smb2_oplock_break_send(req,
  80                                              req->sconn->smb2.event_ctx,
  81                                              req,
  82                                              in_oplock_level,
  83                                              in_file_id_volatile);
  84         if (subreq == NULL) {
  85                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
  86         }
  87         tevent_req_set_callback(subreq, smbd_smb2_request_oplock_break_done, req);
  88
  89         return smbd_smb2_request_pending_queue(req, subreq);
  90 }
  91
  92 static void smbd_smb2_request_oplock_break_done(struct tevent_req *subreq)
  93 {
  94         struct smbd_smb2_request *req = tevent_req_callback_data(subreq,
  95                                         struct smbd_smb2_request);
  96         const uint8_t *inbody;
  97         int i = req->current_idx;
  98         uint64_t in_file_id_persistent;
  99         uint64_t in_file_id_volatile;
 100         uint8_t out_oplock_level = 0;
 101         DATA_BLOB outbody;
 102         NTSTATUS status;
 103         NTSTATUS error; /* transport error */
 104
 105         status = smbd_smb2_oplock_break_recv(subreq, &out_oplock_level);
 106         TALLOC_FREE(subreq);
 107         if (!NT_STATUS_IS_OK(status)) {
 108                 error = smbd_smb2_request_error(req, status);
 109                 if (!NT_STATUS_IS_OK(error)) {
 110                         smbd_server_connection_terminate(req->sconn,
 111                                                          nt_errstr(error));
 112                         return;
 113                 }
 114                 return;
 115         }
 116
 117         inbody = (const uint8_t *)req->in.vector[i+1].iov_base;
 118
 119         in_file_id_persistent   = BVAL(inbody, 0x08);
 120         in_file_id_volatile     = BVAL(inbody, 0x10);
 121
 122         outbody = data_blob_talloc(req->out.vector, NULL, 0x18);
 123         if (outbody.data == NULL) {
 124                 error = smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 125                 if (!NT_STATUS_IS_OK(error)) {
 126                         smbd_server_connection_terminate(req->sconn,
 127                                                          nt_errstr(error));
 128                         return;
 129                 }
 130                 return;
 131         }
 132
 133         SSVAL(outbody.data, 0x00, 0x18);        /* struct size */
 134         SCVAL(outbody.data, 0x02,
 135               out_oplock_level);                /* SMB2 oplock level */
 136         SCVAL(outbody.data, 0x03, 0);           /* reserved */
 137         SIVAL(outbody.data, 0x04, 0);           /* reserved */
 138         SBVAL(outbody.data, 0x08,
 139               in_file_id_persistent);           /* file id (persistent) */
 140         SBVAL(outbody.data, 0x10,
 141               in_file_id_volatile);             /* file id (volatile) */
 142
 143         error = smbd_smb2_request_done(req, outbody, NULL);
 144         if (!NT_STATUS_IS_OK(error)) {
 145                 smbd_server_connection_terminate(req->sconn,
 146                                                  nt_errstr(error));
 147                 return;
 148         }
 149 }
 150
 151 struct smbd_smb2_oplock_break_state {
 152         struct smbd_smb2_request *smb2req;
 153         uint8_t out_oplock_level; /* SMB2 oplock level. */
 154 };
 155
 156 static struct tevent_req *smbd_smb2_oplock_break_send(TALLOC_CTX *mem_ctx,
 157                                                       struct tevent_context *ev,
 158                                                       struct smbd_smb2_request *smb2req,
 159                                                       uint8_t in_oplock_level,
 160                                                       uint64_t in_file_id_volatile)
 161 {
 162         struct tevent_req *req;
 163         struct smbd_smb2_oplock_break_state *state;
 164         struct smb_request *smbreq;
 165         connection_struct *conn = smb2req->tcon->compat_conn;
 166         files_struct *fsp = NULL;
 167         int oplocklevel = map_smb2_oplock_levels_to_samba(in_oplock_level);
 168         bool break_to_none = (oplocklevel == NO_OPLOCK);
 169         bool result;
 170
 171         req = tevent_req_create(mem_ctx, &state,
 172                                 struct smbd_smb2_oplock_break_state);
 173         if (req == NULL) {
 174                 return NULL;
 175         }
 176         state->smb2req = smb2req;
 177         state->out_oplock_level = SMB2_OPLOCK_LEVEL_NONE;
 178
 179         DEBUG(10,("smbd_smb2_oplock_break_send: file_id[0x%016llX] "
 180                 "samba level %d\n",
 181                 (unsigned long long)in_file_id_volatile,
 182                 oplocklevel));
 183
 184         smbreq = smbd_smb2_fake_smb_request(smb2req);
 185         if (tevent_req_nomem(smbreq, req)) {
 186                 return tevent_req_post(req, ev);
 187         }
 188
 189         fsp = file_fsp(smbreq, (uint16_t)in_file_id_volatile);
 190         if (fsp == NULL) {
 191                 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 192                 return tevent_req_post(req, ev);
 193         }
 194         if (conn != fsp->conn) {
 195                 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 196                 return tevent_req_post(req, ev);
 197         }
 198         if (smb2req->session->vuid != fsp->vuid) {
 199                 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 200                 return tevent_req_post(req, ev);
 201         }
 202
 203         DEBUG(5,("smbd_smb2_oplock_break_send: got SMB2 oplock break (%u) from client "
 204                 "for file %s fnum = %d\n",
 205                 (unsigned int)in_oplock_level,
 206                 fsp_str_dbg(fsp),
 207                 fsp->fnum ));
 208
 209         /* Are we awaiting a break message ? */
 210         if (fsp->oplock_timeout == NULL) {
 211                 tevent_req_nterror(req, NT_STATUS_INVALID_OPLOCK_PROTOCOL);
 212                 return tevent_req_post(req, ev);
 213         }
 214
 215         if ((fsp->sent_oplock_break == BREAK_TO_NONE_SENT) ||
 216                         (break_to_none)) {
 217                 result = remove_oplock(fsp);
 218                 state->out_oplock_level = SMB2_OPLOCK_LEVEL_NONE;
 219         } else {
 220                 result = downgrade_oplock(fsp);
 221                 state->out_oplock_level = SMB2_OPLOCK_LEVEL_II;
 222         }
 223
 224         if (!result) {
 225                 DEBUG(0, ("smbd_smb2_oplock_break_send: error in removing "
 226                         "oplock on file %s\n", fsp_str_dbg(fsp)));
 227                 /* Hmmm. Is this panic justified? */
 228                 smb_panic("internal tdb error");
 229         }
 230
 231         reply_to_oplock_break_requests(fsp);
 232
 233         tevent_req_done(req);
 234         return tevent_req_post(req, ev);
 235 }
 236
 237 static NTSTATUS smbd_smb2_oplock_break_recv(struct tevent_req *req,
 238                                             uint8_t *out_oplock_level)
 239 {
 240         NTSTATUS status;
 241         struct smbd_smb2_oplock_break_state *state =
 242                 tevent_req_data(req,
 243                 struct smbd_smb2_oplock_break_state);
 244
 245         if (tevent_req_is_nterror(req, &status)) {
 246                 tevent_req_received(req);
 247                 return status;
 248         }
 249
 250         *out_oplock_level = state->out_oplock_level;
 251
 252         tevent_req_received(req);
 253         return NT_STATUS_OK;
 254 }
 255
 256 /*********************************************************
 257  Create and send an asynchronous
 258  SMB2 OPLOCK_BREAK_NOTIFICATION.
 259 *********************************************************/
 260
 261 void send_break_message_smb2(files_struct *fsp, int level)
 262 {
 263         uint8_t smb2_oplock_level = (level == OPLOCKLEVEL_II) ?
 264                                 SMB2_OPLOCK_LEVEL_II :
 265                                 SMB2_OPLOCK_LEVEL_NONE;
 266         NTSTATUS status;
 267
 268         DEBUG(10,("send_break_message_smb2: sending oplock break "
 269                 "for file %s, fnum = %d, smb2 level %u\n",
 270                 fsp_str_dbg(fsp),
 271                 fsp->fnum,
 272                 (unsigned int)smb2_oplock_level ));
 273
 274         status = smbd_smb2_send_oplock_break(fsp->conn->sconn,
 275                                         (uint64_t)fsp->fnum,
 276                                         (uint64_t)fsp->fnum,
 277                                         smb2_oplock_level);
 278         if (!NT_STATUS_IS_OK(status)) {
 279                 smbd_server_connection_terminate(fsp->conn->sconn,
 280                                  nt_errstr(status));
 281         }
 282 }