source4/smb_server/smb2/tcon.c

   1 /*
   2    Unix SMB2 implementation.
   3
   4    Copyright (C) Stefan Metzmacher      2005
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #include "includes.h"
  21 #include "libcli/smb2/smb2.h"
  22 #include "libcli/smb2/smb2_calls.h"
  23 #include "smb_server/smb_server.h"
  24 #include "smb_server/smb2/smb2_server.h"
  25 #include "smbd/service_stream.h"
  26 #include "ntvfs/ntvfs.h"
  27
  28 /*
  29   send an oplock break request to a client
  30 */
  31 static NTSTATUS smb2srv_send_oplock_break(void *p, struct ntvfs_handle *h, uint8_t level)
  32 {
  33         struct smbsrv_handle *handle = talloc_get_type(h->frontend_data.private_data,
  34                                                        struct smbsrv_handle);
  35         struct smb2srv_request *req;
  36         NTSTATUS status;
  37
  38         /* setup a dummy request structure */
  39         req = smb2srv_init_request(handle->tcon->smb_conn);
  40         NT_STATUS_HAVE_NO_MEMORY(req);
  41
  42         req->in.buffer          = talloc_array(req, uint8_t,
  43                                                NBT_HDR_SIZE + SMB2_MIN_SIZE);
  44         NT_STATUS_HAVE_NO_MEMORY(req->in.buffer);
  45         req->in.size            = NBT_HDR_SIZE + SMB2_MIN_SIZE;
  46         req->in.allocated       = req->in.size;
  47
  48         req->in.hdr             = req->in.buffer+ NBT_HDR_SIZE;
  49         req->in.body            = req->in.hdr   + SMB2_HDR_BODY;
  50         req->in.body_size       = req->in.size  - (SMB2_HDR_BODY+NBT_HDR_SIZE);
  51         req->in.dynamic         = NULL;
  52
  53         req->seqnum             = UINT64_MAX;
  54
  55         smb2srv_setup_bufinfo(req);
  56
  57         SIVAL(req->in.hdr, 0,                           SMB2_MAGIC);
  58         SSVAL(req->in.hdr, SMB2_HDR_LENGTH,             SMB2_HDR_BODY);
  59         SSVAL(req->in.hdr, SMB2_HDR_EPOCH,              0);
  60         SIVAL(req->in.hdr, SMB2_HDR_STATUS,             0);
  61         SSVAL(req->in.hdr, SMB2_HDR_OPCODE,             SMB2_OP_BREAK);
  62         SSVAL(req->in.hdr, SMB2_HDR_CREDIT,             0);
  63         SIVAL(req->in.hdr, SMB2_HDR_FLAGS,              0);
  64         SIVAL(req->in.hdr, SMB2_HDR_NEXT_COMMAND,       0);
  65         SBVAL(req->in.hdr, SMB2_HDR_MESSAGE_ID,         0);
  66         SIVAL(req->in.hdr, SMB2_HDR_PID,                0);
  67         SIVAL(req->in.hdr, SMB2_HDR_TID,                0);
  68         SBVAL(req->in.hdr, SMB2_HDR_SESSION_ID,         0);
  69         memset(req->in.hdr+SMB2_HDR_SIGNATURE, 0, 16);
  70
  71         SSVAL(req->in.body, 0, 2);
  72
  73         status = smb2srv_setup_reply(req, 0x18, false, 0);
  74         NT_STATUS_NOT_OK_RETURN(status);
  75
  76         SSVAL(req->out.hdr, SMB2_HDR_CREDIT,    0x0000);
  77
  78         SSVAL(req->out.body, 0x02, 0x0001);
  79         SIVAL(req->out.body, 0x04, 0x00000000);
  80         smb2srv_push_handle(req->out.body, 0x08, h);
  81
  82         smb2srv_send_reply(req);
  83
  84         return NT_STATUS_OK;
  85 }
  86
  87 struct ntvfs_handle *smb2srv_pull_handle(struct smb2srv_request *req, const uint8_t *base, unsigned int offset)
  88 {
  89         struct smbsrv_tcon *tcon;
  90         struct smbsrv_handle *handle;
  91         uint32_t hid;
  92         uint32_t tid;
  93         uint64_t uid;
  94
  95         /*
  96          * if there're chained requests used the cached handle
  97          *
  98          * TODO: check if this also correct when the given handle
  99          *       isn't all 0xFF.
 100          */
 101         if (req->chained_file_handle) {
 102                 base = req->chained_file_handle;
 103                 offset = 0;
 104         }
 105
 106         hid = IVAL(base, offset);
 107         tid = IVAL(base, offset + 4);
 108         uid = BVAL(base, offset + 8);
 109
 110         /* if it's the wildcard handle, don't waste time to search it... */
 111         if (hid == UINT32_MAX && tid == UINT32_MAX && uid == UINT64_MAX) {
 112                 return NULL;
 113         }
 114
 115         /*
 116          * if the (v)uid part doesn't match the given session the handle isn't
 117          * valid
 118          */
 119         if (uid != req->session->vuid) {
 120                 return NULL;
 121         }
 122
 123         /*
 124          * the handle can belong to a different tcon
 125          * as that TID in the SMB2 header says, but
 126          * the request should succeed nevertheless!
 127          *
 128          * because of this we put the 32 bit TID into the
 129          * 128 bit handle, so that we can extract the tcon from the
 130          * handle
 131          */
 132         tcon = req->tcon;
 133         if (tid != req->tcon->tid) {
 134                 tcon = smbsrv_smb2_tcon_find(req->session, tid, req->request_time);
 135                 if (!tcon) {
 136                         return NULL;
 137                 }
 138         }
 139
 140         handle = smbsrv_smb2_handle_find(tcon, hid, req->request_time);
 141         if (!handle) {
 142                 return NULL;
 143         }
 144
 145         /*
 146          * as the smb2srv_tcon is a child object of the smb2srv_session
 147          * the handle belongs to the correct session!
 148          *
 149          * Note: no check is needed here for SMB2
 150          */
 151
 152         /*
 153          * as the handle may have overwritten the tcon
 154          * we need to set it on the request so that the
 155          * correct ntvfs context will be used for the ntvfs_*() request
 156          *
 157          * TODO: check if that's correct for chained requests as well!
 158          */
 159         req->tcon = tcon;
 160         return handle->ntvfs;
 161 }
 162
 163 void smb2srv_push_handle(uint8_t *base, unsigned int offset, struct ntvfs_handle *ntvfs)
 164 {
 165         struct smbsrv_handle *handle = talloc_get_type(ntvfs->frontend_data.private_data,
 166                                        struct smbsrv_handle);
 167
 168         /*
 169          * the handle is 128 bit on the wire
 170          */
 171         SIVAL(base, offset,     handle->hid);
 172         SIVAL(base, offset + 4, handle->tcon->tid);
 173         SBVAL(base, offset + 8, handle->session->vuid);
 174 }
 175
 176 static NTSTATUS smb2srv_handle_create_new(void *private_data, struct ntvfs_request *ntvfs, struct ntvfs_handle **_h)
 177 {
 178         struct smb2srv_request *req = talloc_get_type(ntvfs->frontend_data.private_data,
 179                                       struct smb2srv_request);
 180         struct smbsrv_handle *handle;
 181         struct ntvfs_handle *h;
 182
 183         handle = smbsrv_handle_new(req->session, req->tcon, req, req->request_time);
 184         if (!handle) return NT_STATUS_INSUFFICIENT_RESOURCES;
 185
 186         h = talloc_zero(handle, struct ntvfs_handle);
 187         if (!h) goto nomem;
 188
 189         /*
 190          * note: we don't set handle->ntvfs yet,
 191          *       this will be done by smbsrv_handle_make_valid()
 192          *       this makes sure the handle is invalid for clients
 193          *       until the ntvfs subsystem has made it valid
 194          */
 195         h->ctx          = ntvfs->ctx;
 196         h->session_info = ntvfs->session_info;
 197         h->smbpid       = ntvfs->smbpid;
 198
 199         h->frontend_data.private_data = handle;
 200
 201         *_h = h;
 202         return NT_STATUS_OK;
 203 nomem:
 204         talloc_free(handle);
 205         return NT_STATUS_NO_MEMORY;
 206 }
 207
 208 static NTSTATUS smb2srv_handle_make_valid(void *private_data, struct ntvfs_handle *h)
 209 {
 210         struct smbsrv_tcon *tcon = talloc_get_type(private_data, struct smbsrv_tcon);
 211         struct smbsrv_handle *handle = talloc_get_type(h->frontend_data.private_data,
 212                                                        struct smbsrv_handle);
 213         /* this tells the frontend that the handle is valid */
 214         handle->ntvfs = h;
 215         /* this moves the smbsrv_request to the smbsrv_tcon memory context */
 216         talloc_steal(tcon, handle);
 217         return NT_STATUS_OK;
 218 }
 219
 220 static void smb2srv_handle_destroy(void *private_data, struct ntvfs_handle *h)
 221 {
 222         struct smbsrv_handle *handle = talloc_get_type(h->frontend_data.private_data,
 223                                                        struct smbsrv_handle);
 224         talloc_free(handle);
 225 }
 226
 227 static struct ntvfs_handle *smb2srv_handle_search_by_wire_key(void *private_data, struct ntvfs_request *ntvfs, const DATA_BLOB *key)
 228 {
 229         return NULL;
 230 }
 231
 232 static DATA_BLOB smb2srv_handle_get_wire_key(void *private_data, struct ntvfs_handle *handle, TALLOC_CTX *mem_ctx)
 233 {
 234         return data_blob(NULL, 0);
 235 }
 236
 237 static NTSTATUS smb2srv_tcon_backend(struct smb2srv_request *req, union smb_tcon *io)
 238 {
 239         struct smbsrv_tcon *tcon;
 240         NTSTATUS status;
 241         enum ntvfs_type type;
 242         const char *service = io->smb2.in.path;
 243         struct share_config *scfg;
 244         char *sharetype;
 245         uint64_t ntvfs_caps = 0;
 246
 247         if (strncmp(service, "\\\\", 2) == 0) {
 248                 const char *p = strchr(service+2, '\\');
 249                 if (p) {
 250                         service = p + 1;
 251                 }
 252         }
 253
 254         status = share_get_config(req, req->smb_conn->share_context, service, &scfg);
 255         if (!NT_STATUS_IS_OK(status)) {
 256                 DEBUG(0,("smb2srv_tcon_backend: couldn't find service %s\n", service));
 257                 return NT_STATUS_BAD_NETWORK_NAME;
 258         }
 259
 260         if (!socket_check_access(req->smb_conn->connection->socket,
 261                                  scfg->name,
 262                                  share_string_list_option(req, scfg, SHARE_HOSTS_ALLOW),
 263                                  share_string_list_option(req, scfg, SHARE_HOSTS_DENY))) {
 264                 return NT_STATUS_ACCESS_DENIED;
 265         }
 266
 267         /* work out what sort of connection this is */
 268         sharetype = share_string_option(req, scfg, SHARE_TYPE, "DISK");
 269         if (sharetype && strcmp(sharetype, "IPC") == 0) {
 270                 type = NTVFS_IPC;
 271         } else if (sharetype && strcmp(sharetype, "PRINTER") == 0) {
 272                 type = NTVFS_PRINT;
 273         } else {
 274                 type = NTVFS_DISK;
 275         }
 276         TALLOC_FREE(sharetype);
 277
 278         tcon = smbsrv_smb2_tcon_new(req->session, scfg->name);
 279         if (!tcon) {
 280                 DEBUG(0,("smb2srv_tcon_backend: Couldn't find free connection.\n"));
 281                 return NT_STATUS_INSUFFICIENT_RESOURCES;
 282         }
 283         req->tcon = tcon;
 284
 285         ntvfs_caps = NTVFS_CLIENT_CAP_LEVEL_II_OPLOCKS;
 286
 287         /* init ntvfs function pointers */
 288         status = ntvfs_init_connection(tcon, scfg, type,
 289                                        req->smb_conn->negotiate.protocol,
 290                                        ntvfs_caps,
 291                                        req->smb_conn->connection->event.ctx,
 292                                        req->smb_conn->connection->msg_ctx,
 293                                        req->smb_conn->lp_ctx,
 294                                        req->smb_conn->connection->server_id,
 295                                        &tcon->ntvfs);
 296         if (!NT_STATUS_IS_OK(status)) {
 297                 DEBUG(0, ("smb2srv_tcon_backend: ntvfs_init_connection failed for service %s\n",
 298                           scfg->name));
 299                 goto failed;
 300         }
 301
 302         status = ntvfs_set_oplock_handler(tcon->ntvfs, smb2srv_send_oplock_break, tcon);
 303         if (!NT_STATUS_IS_OK(status)) {
 304                 DEBUG(0,("smb2srv_tcon_backend: NTVFS failed to set the oplock handler!\n"));
 305                 goto failed;
 306         }
 307
 308         status = ntvfs_set_addresses(tcon->ntvfs,
 309                                      req->smb_conn->connection->local_address,
 310                                      req->smb_conn->connection->remote_address);
 311         if (!NT_STATUS_IS_OK(status)) {
 312                 DEBUG(0,("smb2srv_tcon_backend: NTVFS failed to set the address!\n"));
 313                 goto failed;
 314         }
 315
 316         status = ntvfs_set_handle_callbacks(tcon->ntvfs,
 317                                             smb2srv_handle_create_new,
 318                                             smb2srv_handle_make_valid,
 319                                             smb2srv_handle_destroy,
 320                                             smb2srv_handle_search_by_wire_key,
 321                                             smb2srv_handle_get_wire_key,
 322                                             tcon);
 323         if (!NT_STATUS_IS_OK(status)) {
 324                 DEBUG(0,("smb2srv_tcon_backend: NTVFS failed to set the handle callbacks!\n"));
 325                 goto failed;
 326         }
 327
 328         req->ntvfs = ntvfs_request_create(req->tcon->ntvfs, req,
 329                                           req->session->session_info,
 330                                           SVAL(req->in.hdr, SMB2_HDR_PID),
 331                                           req->request_time,
 332                                           req, NULL, 0);
 333         if (!req->ntvfs) {
 334                 status = NT_STATUS_NO_MEMORY;
 335                 goto failed;
 336         }
 337
 338         io->smb2.out.share_type   = (unsigned)type; /* 1 - DISK, 2 - Print, 3 - IPC */
 339         io->smb2.out.reserved     = 0;
 340         io->smb2.out.flags        = 0x00000000;
 341         io->smb2.out.capabilities = 0;
 342         io->smb2.out.access_mask  = SEC_RIGHTS_FILE_ALL;
 343
 344         io->smb2.out.tid        = tcon->tid;
 345
 346         /* Invoke NTVFS connection hook */
 347         status = ntvfs_connect(req->ntvfs, io);
 348         if (!NT_STATUS_IS_OK(status)) {
 349                 DEBUG(0,("smb2srv_tcon_backend: NTVFS ntvfs_connect() failed: %s!\n", nt_errstr(status)));
 350                 goto failed;
 351         }
 352
 353         return NT_STATUS_OK;
 354
 355 failed:
 356         req->tcon = NULL;
 357         talloc_free(tcon);
 358         return status;
 359 }
 360
 361 static void smb2srv_tcon_send(struct smb2srv_request *req, union smb_tcon *io)
 362 {
 363         if (!NT_STATUS_IS_OK(req->status)) {
 364                 smb2srv_send_error(req, req->status);
 365                 return;
 366         }
 367
 368         SMB2SRV_CHECK(smb2srv_setup_reply(req, 0x10, false, 0));
 369
 370         SIVAL(req->out.hdr,     SMB2_HDR_TID,   io->smb2.out.tid);
 371
 372         SCVAL(req->out.body,    0x02,           io->smb2.out.share_type);
 373         SCVAL(req->out.body,    0x03,           io->smb2.out.reserved);
 374         SIVAL(req->out.body,    0x04,           io->smb2.out.flags);
 375         SIVAL(req->out.body,    0x08,           io->smb2.out.capabilities);
 376         SIVAL(req->out.body,    0x0C,           io->smb2.out.access_mask);
 377
 378         smb2srv_send_reply(req);
 379 }
 380
 381 void smb2srv_tcon_recv(struct smb2srv_request *req)
 382 {
 383         union smb_tcon *io;
 384
 385         SMB2SRV_CHECK_BODY_SIZE(req, 0x08, true);
 386         SMB2SRV_TALLOC_IO_PTR(io, union smb_tcon);
 387
 388         io->smb2.level          = RAW_TCON_SMB2;
 389         io->smb2.in.reserved    = SVAL(req->in.body, 0x02);
 390         SMB2SRV_CHECK(smb2_pull_o16s16_string(&req->in, io, req->in.body+0x04, &io->smb2.in.path));
 391
 392         /* the VFS backend does not yet handle NULL paths */
 393         if (io->smb2.in.path == NULL) {
 394                 io->smb2.in.path = "";
 395         }
 396
 397         req->status = smb2srv_tcon_backend(req, io);
 398
 399         if (req->control_flags & SMB2SRV_REQ_CTRL_FLAG_NOT_REPLY) {
 400                 talloc_free(req);
 401                 return;
 402         }
 403         smb2srv_tcon_send(req, io);
 404 }
 405
 406 static NTSTATUS smb2srv_tdis_backend(struct smb2srv_request *req)
 407 {
 408         /* TODO: call ntvfs backends to close file of this tcon */
 409         talloc_free(req->tcon);
 410         req->tcon = NULL;
 411         return NT_STATUS_OK;
 412 }
 413
 414 static void smb2srv_tdis_send(struct smb2srv_request *req)
 415 {
 416         NTSTATUS status;
 417
 418         if (NT_STATUS_IS_ERR(req->status)) {
 419                 smb2srv_send_error(req, req->status);
 420                 return;
 421         }
 422
 423         status = smb2srv_setup_reply(req, 0x04, false, 0);
 424         if (!NT_STATUS_IS_OK(status)) {
 425                 smbsrv_terminate_connection(req->smb_conn, nt_errstr(status));
 426                 talloc_free(req);
 427                 return;
 428         }
 429
 430         SSVAL(req->out.body, 0x02, 0);
 431
 432         smb2srv_send_reply(req);
 433 }
 434
 435 void smb2srv_tdis_recv(struct smb2srv_request *req)
 436 {
 437         SMB2SRV_CHECK_BODY_SIZE(req, 0x04, false);
 438
 439         req->status = smb2srv_tdis_backend(req);
 440
 441         if (req->control_flags & SMB2SRV_REQ_CTRL_FLAG_NOT_REPLY) {
 442                 talloc_free(req);
 443                 return;
 444         }
 445         smb2srv_tdis_send(req);
 446 }