source3/smbd/smb2_lock.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/globals.h"
  23 #include "../libcli/smb/smb_common.h"
  24
  25 struct smbd_smb2_lock_element {
  26         uint64_t offset;
  27         uint64_t length;
  28         uint32_t flags;
  29 };
  30
  31 static struct tevent_req *smbd_smb2_lock_send(TALLOC_CTX *mem_ctx,
  32                                                  struct tevent_context *ev,
  33                                                  struct smbd_smb2_request *smb2req,
  34                                                  uint32_t in_smbpid,
  35                                                  uint64_t in_file_id_volatile,
  36                                                  uint16_t in_lock_count,
  37                                                  struct smbd_smb2_lock_element *in_locks);
  38 static NTSTATUS smbd_smb2_lock_recv(struct tevent_req *req);
  39
  40 static void smbd_smb2_request_lock_done(struct tevent_req *subreq);
  41 NTSTATUS smbd_smb2_request_process_lock(struct smbd_smb2_request *req)
  42 {
  43         const uint8_t *inhdr;
  44         const uint8_t *inbody;
  45         const int i = req->current_idx;
  46         size_t expected_body_size = 0x30;
  47         size_t body_size;
  48         uint32_t in_smbpid;
  49         uint16_t in_lock_count;
  50         uint64_t in_file_id_persistent;
  51         uint64_t in_file_id_volatile;
  52         struct smbd_smb2_lock_element *in_locks;
  53         struct tevent_req *subreq;
  54         const uint8_t *lock_buffer;
  55         uint16_t l;
  56
  57         inhdr = (const uint8_t *)req->in.vector[i+0].iov_base;
  58         if (req->in.vector[i+1].iov_len != (expected_body_size & 0xFFFFFFFE)) {
  59                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  60         }
  61
  62         inbody = (const uint8_t *)req->in.vector[i+1].iov_base;
  63
  64         body_size = SVAL(inbody, 0x00);
  65         if (body_size != expected_body_size) {
  66                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  67         }
  68
  69         in_smbpid                       = IVAL(inhdr, SMB2_HDR_PID);
  70
  71         in_lock_count                   = CVAL(inbody, 0x02);
  72         /* 0x04 - 4 bytes reserved */
  73         in_file_id_persistent           = BVAL(inbody, 0x08);
  74         in_file_id_volatile             = BVAL(inbody, 0x10);
  75
  76         if (in_lock_count < 1) {
  77                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  78         }
  79
  80         if (((in_lock_count - 1) * 0x18) > req->in.vector[i+2].iov_len) {
  81                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  82         }
  83
  84         if (req->compat_chain_fsp) {
  85                 /* skip check */
  86         } else if (in_file_id_persistent != 0) {
  87                 return smbd_smb2_request_error(req, NT_STATUS_FILE_CLOSED);
  88         }
  89
  90         in_locks = talloc_array(req, struct smbd_smb2_lock_element,
  91                                 in_lock_count);
  92         if (in_locks == NULL) {
  93                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
  94         }
  95
  96         l = 0;
  97         lock_buffer = inbody + 0x18;
  98
  99         in_locks[l].offset      = BVAL(lock_buffer, 0x00);
 100         in_locks[l].length      = BVAL(lock_buffer, 0x08);
 101         in_locks[l].flags       = IVAL(lock_buffer, 0x10);
 102         /* 0x14 - 4 reserved bytes */
 103
 104         lock_buffer = (const uint8_t *)req->in.vector[i+2].iov_base;
 105
 106         for (l=1; l < in_lock_count; l++) {
 107                 in_locks[l].offset      = BVAL(lock_buffer, 0x00);
 108                 in_locks[l].length      = BVAL(lock_buffer, 0x08);
 109                 in_locks[l].flags       = IVAL(lock_buffer, 0x10);
 110                 /* 0x14 - 4 reserved bytes */
 111
 112                 lock_buffer += 0x18;
 113         }
 114
 115         subreq = smbd_smb2_lock_send(req,
 116                                      req->sconn->smb2.event_ctx,
 117                                      req,
 118                                      in_smbpid,
 119                                      in_file_id_volatile,
 120                                      in_lock_count,
 121                                      in_locks);
 122         if (subreq == NULL) {
 123                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 124         }
 125         tevent_req_set_callback(subreq, smbd_smb2_request_lock_done, req);
 126
 127         return smbd_smb2_request_pending_queue(req, subreq);
 128 }
 129
 130 static void smbd_smb2_request_lock_done(struct tevent_req *subreq)
 131 {
 132         struct smbd_smb2_request *req = tevent_req_callback_data(subreq,
 133                                         struct smbd_smb2_request);
 134         DATA_BLOB outbody;
 135         NTSTATUS status;
 136         NTSTATUS error; /* transport error */
 137
 138         status = smbd_smb2_lock_recv(subreq);
 139         TALLOC_FREE(subreq);
 140         if (!NT_STATUS_IS_OK(status)) {
 141                 error = smbd_smb2_request_error(req, status);
 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         outbody = data_blob_talloc(req->out.vector, NULL, 0x04);
 151         if (outbody.data == NULL) {
 152                 error = smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 153                 if (!NT_STATUS_IS_OK(error)) {
 154                         smbd_server_connection_terminate(req->sconn,
 155                                                          nt_errstr(error));
 156                         return;
 157                 }
 158                 return;
 159         }
 160
 161         SSVAL(outbody.data, 0x00, 0x04);        /* struct size */
 162         SSVAL(outbody.data, 0x02, 0);           /* reserved */
 163
 164         error = smbd_smb2_request_done(req, outbody, NULL);
 165         if (!NT_STATUS_IS_OK(error)) {
 166                 smbd_server_connection_terminate(req->sconn,
 167                                                  nt_errstr(error));
 168                 return;
 169         }
 170 }
 171
 172 struct smbd_smb2_lock_state {
 173         struct smbd_smb2_request *smb2req;
 174 };
 175
 176 static struct tevent_req *smbd_smb2_lock_send(TALLOC_CTX *mem_ctx,
 177                                                  struct tevent_context *ev,
 178                                                  struct smbd_smb2_request *smb2req,
 179                                                  uint32_t in_smbpid,
 180                                                  uint64_t in_file_id_volatile,
 181                                                  uint16_t in_lock_count,
 182                                                  struct smbd_smb2_lock_element *in_locks)
 183 {
 184         struct tevent_req *req;
 185         struct smbd_smb2_lock_state *state;
 186         struct smb_request *smbreq;
 187         connection_struct *conn = smb2req->tcon->compat_conn;
 188         files_struct *fsp;
 189         int32_t timeout = -1;
 190         bool isunlock = false;
 191         uint16_t i;
 192         struct smbd_lock_element *locks;
 193         NTSTATUS status;
 194         bool async = false;
 195
 196         req = tevent_req_create(mem_ctx, &state,
 197                                 struct smbd_smb2_lock_state);
 198         if (req == NULL) {
 199                 return NULL;
 200         }
 201         state->smb2req = smb2req;
 202
 203         DEBUG(10,("smbd_smb2_lock_send: file_id[0x%016llX]\n",
 204                   (unsigned long long)in_file_id_volatile));
 205
 206         smbreq = smbd_smb2_fake_smb_request(smb2req);
 207         if (tevent_req_nomem(smbreq, req)) {
 208                 return tevent_req_post(req, ev);
 209         }
 210
 211         fsp = file_fsp(smbreq, (uint16_t)in_file_id_volatile);
 212         if (fsp == NULL) {
 213                 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 214                 return tevent_req_post(req, ev);
 215         }
 216         if (conn != fsp->conn) {
 217                 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 218                 return tevent_req_post(req, ev);
 219         }
 220         if (smb2req->session->vuid != fsp->vuid) {
 221                 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 222                 return tevent_req_post(req, ev);
 223         }
 224
 225         locks = talloc_array(state, struct smbd_lock_element, in_lock_count);
 226         if (locks == NULL) {
 227                 tevent_req_nterror(req, NT_STATUS_NO_MEMORY);
 228                 return tevent_req_post(req, ev);
 229         }
 230
 231         switch (in_locks[0].flags) {
 232         case SMB2_LOCK_FLAG_SHARED:
 233         case SMB2_LOCK_FLAG_EXCLUSIVE:
 234                 if (in_lock_count > 1) {
 235                         tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER);
 236                         return tevent_req_post(req, ev);
 237                 }
 238                 timeout = -1;
 239                 break;
 240
 241         case SMB2_LOCK_FLAG_SHARED|SMB2_LOCK_FLAG_FAIL_IMMEDIATELY:
 242         case SMB2_LOCK_FLAG_EXCLUSIVE|SMB2_LOCK_FLAG_FAIL_IMMEDIATELY:
 243                 timeout = 0;
 244                 break;
 245
 246         case SMB2_LOCK_FLAG_UNLOCK:
 247                 /* only the first lock gives the UNLOCK bit - see
 248                    MS-SMB2 3.3.5.14 */
 249                 isunlock = true;
 250                 timeout = 0;
 251                 break;
 252
 253         default:
 254                 tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER);
 255                 return tevent_req_post(req, ev);
 256         }
 257
 258         for (i=0; i<in_lock_count; i++) {
 259                 uint64_t max_count;
 260                 bool invalid = false;
 261
 262                 switch (in_locks[i].flags) {
 263                 case SMB2_LOCK_FLAG_SHARED:
 264                 case SMB2_LOCK_FLAG_EXCLUSIVE:
 265                         if (i > 0) {
 266                                 tevent_req_nterror(req,
 267                                                    NT_STATUS_INVALID_PARAMETER);
 268                                 return tevent_req_post(req, ev);
 269                         }
 270                         if (isunlock) {
 271                                 tevent_req_nterror(req,
 272                                                    NT_STATUS_INVALID_PARAMETER);
 273                                 return tevent_req_post(req, ev);
 274                         }
 275                         break;
 276
 277                 case SMB2_LOCK_FLAG_SHARED|SMB2_LOCK_FLAG_FAIL_IMMEDIATELY:
 278                 case SMB2_LOCK_FLAG_EXCLUSIVE|SMB2_LOCK_FLAG_FAIL_IMMEDIATELY:
 279                         if (isunlock) {
 280                                 tevent_req_nterror(req,
 281                                                    NT_STATUS_INVALID_PARAMETER);
 282                                 return tevent_req_post(req, ev);
 283                         }
 284                         break;
 285
 286                 case SMB2_LOCK_FLAG_UNLOCK:
 287                         if (!isunlock) {
 288                                 tevent_req_nterror(req,
 289                                                    NT_STATUS_INVALID_PARAMETER);
 290                                 return tevent_req_post(req, ev);
 291                         }
 292                         break;
 293
 294                 default:
 295                         if (isunlock) {
 296                                 /*
 297                                  * is the first element was a UNLOCK
 298                                  * we need to deferr the error response
 299                                  * to the backend, because we need to process
 300                                  * all unlock elements before
 301                                  */
 302                                 invalid = true;
 303                                 break;
 304                         }
 305                         tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER);
 306                         return tevent_req_post(req, ev);
 307                 }
 308
 309                 locks[i].smbpid = in_smbpid;
 310                 locks[i].offset = in_locks[i].offset;
 311                 locks[i].count  = in_locks[i].length;
 312
 313                 if (in_locks[i].flags & SMB2_LOCK_FLAG_EXCLUSIVE) {
 314                         locks[i].brltype = WRITE_LOCK;
 315                 } else if (in_locks[i].flags & SMB2_LOCK_FLAG_SHARED) {
 316                         locks[i].brltype = READ_LOCK;
 317                 } else if (invalid) {
 318                         /*
 319                          * this is an invalid UNLOCK element
 320                          * and the backend needs to test for
 321                          * brltype != UNLOCK_LOCK and return
 322                          * NT_STATUS_INVALID_PARAMER
 323                          */
 324                         locks[i].brltype = READ_LOCK;
 325                 } else {
 326                         locks[i].brltype = UNLOCK_LOCK;
 327                 }
 328
 329                 max_count = UINT64_MAX - locks[i].offset;
 330                 if (locks[i].count > max_count) {
 331                         tevent_req_nterror(req, NT_STATUS_INVALID_LOCK_RANGE);
 332                         return tevent_req_post(req, ev);
 333                 }
 334         }
 335
 336         if (isunlock) {
 337                 status = smbd_do_locking(smbreq, fsp,
 338                                          0,
 339                                          timeout,
 340                                          in_lock_count,
 341                                          locks,
 342                                          0,
 343                                          NULL,
 344                                          &async);
 345         } else {
 346                 status = smbd_do_locking(smbreq, fsp,
 347                                          0,
 348                                          timeout,
 349                                          0,
 350                                          NULL,
 351                                          in_lock_count,
 352                                          locks,
 353                                          &async);
 354         }
 355         if (!NT_STATUS_IS_OK(status)) {
 356                 if (NT_STATUS_EQUAL(status, NT_STATUS_FILE_LOCK_CONFLICT)) {
 357                        status = NT_STATUS_LOCK_NOT_GRANTED;
 358                 }
 359                 tevent_req_nterror(req, status);
 360                 return tevent_req_post(req, ev);
 361         }
 362
 363         if (async) {
 364                 tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
 365                 return tevent_req_post(req, ev);
 366         }
 367
 368         tevent_req_done(req);
 369         return tevent_req_post(req, ev);
 370 }
 371
 372 static NTSTATUS smbd_smb2_lock_recv(struct tevent_req *req)
 373 {
 374         NTSTATUS status;
 375
 376         if (tevent_req_is_nterror(req, &status)) {
 377                 tevent_req_received(req);
 378                 return status;
 379         }
 380
 381         tevent_req_received(req);
 382         return NT_STATUS_OK;
 383 }