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/service_smb_proto.h"
  25 #include "smb_server/smb2/smb2_server.h"
  26 #include "librpc/gen_ndr/security.h"
  27 #include "smbd/service_stream.h"
  28 #include "ntvfs/ntvfs.h"
  29 #include "param/param.h"
  30
  31 /*
  32   send an oplock break request to a client
  33 */
  34 static NTSTATUS smb2srv_send_oplock_break(void *p, struct ntvfs_handle *h, uint8_t level)
  35 {
  36         struct smbsrv_handle *handle = talloc_get_type(h->frontend_data.private_data,
  37                                                        struct smbsrv_handle);
  38         struct smb2srv_request *req;
  39         NTSTATUS status;
  40
  41         /* setup a dummy request structure */
  42         req = smb2srv_init_request(handle->tcon->smb_conn);
  43         NT_STATUS_HAVE_NO_MEMORY(req);
  44
  45         req->in.buffer          = talloc_array(req, uint8_t,
  46                                                NBT_HDR_SIZE + SMB2_MIN_SIZE);
  47         NT_STATUS_HAVE_NO_MEMORY(req->in.buffer);
  48         req->in.size            = NBT_HDR_SIZE + SMB2_MIN_SIZE;
  49         req->in.allocated       = req->in.size;
  50
  51         req->in.hdr             = req->in.buffer+ NBT_HDR_SIZE;
  52         req->in.body            = req->in.hdr   + SMB2_HDR_BODY;
  53         req->in.body_size       = req->in.size  - (SMB2_HDR_BODY+NBT_HDR_SIZE);
  54         req->in.dynamic         = NULL;
  55
  56         req->seqnum             = UINT64_MAX;
  57
  58         smb2srv_setup_bufinfo(req);
  59
  60         SIVAL(req->in.hdr, 0,                           SMB2_MAGIC);
  61         SSVAL(req->in.hdr, SMB2_HDR_LENGTH,             SMB2_HDR_BODY);
  62         SSVAL(req->in.hdr, SMB2_HDR_EPOCH,              0);
  63         SIVAL(req->in.hdr, SMB2_HDR_STATUS,             0);
  64         SSVAL(req->in.hdr, SMB2_HDR_OPCODE,             SMB2_OP_BREAK);
  65         SSVAL(req->in.hdr, SMB2_HDR_CREDIT,             0);
  66         SIVAL(req->in.hdr, SMB2_HDR_FLAGS,              0);
  67         SIVAL(req->in.hdr, SMB2_HDR_NEXT_COMMAND,       0);
  68         SBVAL(req->in.hdr, SMB2_HDR_MESSAGE_ID,         0);
  69         SIVAL(req->in.hdr, SMB2_HDR_PID,                0);
  70         SIVAL(req->in.hdr, SMB2_HDR_TID,                0);
  71         SBVAL(req->in.hdr, SMB2_HDR_SESSION_ID,         0);
  72         memset(req->in.hdr+SMB2_HDR_SIGNATURE, 0, 16);
  73
  74         SSVAL(req->in.body, 0, 2);
  75
  76         status = smb2srv_setup_reply(req, 0x18, false, 0);
  77         NT_STATUS_NOT_OK_RETURN(status);
  78
  79         SSVAL(req->out.hdr, SMB2_HDR_CREDIT,    0x0000);
  80
  81         SSVAL(req->out.body, 0x02, 0x0001);
  82         SIVAL(req->out.body, 0x04, 0x00000000);
  83         smb2srv_push_handle(req->out.body, 0x08, h);
  84
  85         smb2srv_send_reply(req);
  86
  87         return NT_STATUS_OK;
  88 }
  89
  90 struct ntvfs_handle *smb2srv_pull_handle(struct smb2srv_request *req, const uint8_t *base, uint_t offset)
  91 {
  92         struct smbsrv_tcon *tcon;
  93         struct smbsrv_handle *handle;
  94         uint32_t hid;
  95         uint32_t tid;
  96         uint64_t uid;
  97
  98         /*
  99          * if there're chained requests used the cached handle
 100          *
 101          * TODO: check if this also correct when the given handle
 102          *       isn't all 0xFF.
 103          */
 104         if (req->chained_file_handle) {
 105                 base = req->chained_file_handle;
 106                 offset = 0;
 107         }
 108
 109         hid = IVAL(base, offset);
 110         tid = IVAL(base, offset + 4);
 111         uid = BVAL(base, offset + 8);
 112
 113         /* if it's the wildcard handle, don't waste time to search it... */
 114         if (hid == UINT32_MAX && tid == UINT32_MAX && uid == UINT64_MAX) {
 115                 return NULL;
 116         }
 117
 118         /*
 119          * if the (v)uid part doesn't match the given session the handle isn't
 120          * valid
 121          */
 122         if (uid != req->session->vuid) {
 123                 return NULL;
 124         }
 125
 126         /*
 127          * the handle can belong to a different tcon
 128          * as that TID in the SMB2 header says, but
 129          * the request should succeed nevertheless!
 130          *
 131          * because of this we put the 32 bit TID into the
 132          * 128 bit handle, so that we can extract the tcon from the
 133          * handle
 134          */
 135         tcon = req->tcon;
 136         if (tid != req->tcon->tid) {
 137                 tcon = smbsrv_smb2_tcon_find(req->session, tid, req->request_time);
 138                 if (!tcon) {
 139                         return NULL;
 140                 }
 141         }
 142
 143         handle = smbsrv_smb2_handle_find(tcon, hid, req->request_time);
 144         if (!handle) {
 145                 return NULL;
 146         }
 147
 148         /*
 149          * as the smb2srv_tcon is a child object of the smb2srv_session
 150          * the handle belongs to the correct session!
 151          *
 152          * Note: no check is needed here for SMB2
 153          */
 154
 155         /*
 156          * as the handle may have overwritten the tcon
 157          * we need to set it on the request so that the
 158          * correct ntvfs context will be used for the ntvfs_*() request
 159          *
 160          * TODO: check if that's correct for chained requests as well!
 161          */
 162         req->tcon = tcon;
 163         return handle->ntvfs;
 164 }
 165
 166 void smb2srv_push_handle(uint8_t *base, uint_t offset, struct ntvfs_handle *ntvfs)
 167 {
 168         struct smbsrv_handle *handle = talloc_get_type(ntvfs->frontend_data.private_data,
 169                                        struct smbsrv_handle);
 170
 171         /*
 172          * the handle is 128 bit on the wire
 173          */
 174         SIVAL(base, offset,     handle->hid);
 175         SIVAL(base, offset + 4, handle->tcon->tid);
 176         SBVAL(base, offset + 8, handle->session->vuid);
 177 }
 178
 179 static NTSTATUS smb2srv_handle_create_new(void *private_data, struct ntvfs_request *ntvfs, struct ntvfs_handle **_h)
 180 {
 181         struct smb2srv_request *req = talloc_get_type(ntvfs->frontend_data.private_data,
 182                                       struct smb2srv_request);
 183         struct smbsrv_handle *handle;
 184         struct ntvfs_handle *h;
 185
 186         handle = smbsrv_handle_new(req->session, req->tcon, req, req->request_time);
 187         if (!handle) return NT_STATUS_INSUFFICIENT_RESOURCES;
 188
 189         h = talloc_zero(handle, struct ntvfs_handle);
 190         if (!h) goto nomem;
 191
 192         /*
 193          * note: we don't set handle->ntvfs yet,
 194          *       this will be done by smbsrv_handle_make_valid()
 195          *       this makes sure the handle is invalid for clients
 196          *       until the ntvfs subsystem has made it valid
 197          */
 198         h->ctx          = ntvfs->ctx;
 199         h->session_info = ntvfs->session_info;
 200         h->smbpid       = ntvfs->smbpid;
 201
 202         h->frontend_data.private_data = handle;
 203
 204         *_h = h;
 205         return NT_STATUS_OK;
 206 nomem:
 207         talloc_free(handle);
 208         return NT_STATUS_NO_MEMORY;
 209 }
 210
 211 static NTSTATUS smb2srv_handle_make_valid(void *private_data, struct ntvfs_handle *h)
 212 {
 213         struct smbsrv_tcon *tcon = talloc_get_type(private_data, struct smbsrv_tcon);
 214         struct smbsrv_handle *handle = talloc_get_type(h->frontend_data.private_data,
 215                                                        struct smbsrv_handle);
 216         /* this tells the frontend that the handle is valid */
 217         handle->ntvfs = h;
 218         /* this moves the smbsrv_request to the smbsrv_tcon memory context */
 219         talloc_steal(tcon, handle);
 220         return NT_STATUS_OK;
 221 }
 222
 223 static void smb2srv_handle_destroy(void *private_data, struct ntvfs_handle *h)
 224 {
 225         struct smbsrv_handle *handle = talloc_get_type(h->frontend_data.private_data,
 226                                                        struct smbsrv_handle);
 227         talloc_free(handle);
 228 }
 229
 230 static struct ntvfs_handle *smb2srv_handle_search_by_wire_key(void *private_data, struct ntvfs_request *ntvfs, const DATA_BLOB *key)
 231 {
 232         return NULL;
 233 }
 234
 235 static DATA_BLOB smb2srv_handle_get_wire_key(void *private_data, struct ntvfs_handle *handle, TALLOC_CTX *mem_ctx)
 236 {
 237         return data_blob(NULL, 0);
 238 }
 239
 240 static NTSTATUS smb2srv_tcon_backend(struct smb2srv_request *req, union smb_tcon *io)
 241 {
 242         struct smbsrv_tcon *tcon;
 243         NTSTATUS status;
 244         enum ntvfs_type type;
 245         const char *service = io->smb2.in.path;
 246         struct share_config *scfg;
 247         const char *sharetype;
 248         uint64_t ntvfs_caps = 0;
 249
 250         if (strncmp(service, "\\\\", 2) == 0) {
 251                 const char *p = strchr(service+2, '\\');
 252                 if (p) {
 253                         service = p + 1;
 254                 }
 255         }
 256
 257         status = share_get_config(req, req->smb_conn->share_context, service, &scfg);
 258         if (!NT_STATUS_IS_OK(status)) {
 259                 DEBUG(0,("smb2srv_tcon_backend: couldn't find service %s\n", service));
 260                 return NT_STATUS_BAD_NETWORK_NAME;
 261         }
 262
 263         if (!socket_check_access(req->smb_conn->connection->socket,
 264                                  scfg->name,
 265                                  share_string_list_option(req, scfg, SHARE_HOSTS_ALLOW),
 266                                  share_string_list_option(req, scfg, SHARE_HOSTS_DENY))) {
 267                 return NT_STATUS_ACCESS_DENIED;
 268         }
 269
 270         /* work out what sort of connection this is */
 271         sharetype = share_string_option(scfg, SHARE_TYPE, "DISK");
 272         if (sharetype && strcmp(sharetype, "IPC") == 0) {
 273                 type = NTVFS_IPC;
 274         } else if (sharetype && strcmp(sharetype, "PRINTER") == 0) {
 275                 type = NTVFS_PRINT;
 276         } else {
 277                 type = NTVFS_DISK;
 278         }
 279
 280         tcon = smbsrv_smb2_tcon_new(req->session, scfg->name);
 281         if (!tcon) {
 282                 DEBUG(0,("smb2srv_tcon_backend: Couldn't find free connection.\n"));
 283                 return NT_STATUS_INSUFFICIENT_RESOURCES;
 284         }
 285         req->tcon = tcon;
 286
 287         ntvfs_caps = NTVFS_CLIENT_CAP_LEVEL_II_OPLOCKS;
 288
 289         /* init ntvfs function pointers */
 290         status = ntvfs_init_connection(tcon, scfg, type,
 291                                        req->smb_conn->negotiate.protocol,
 292                                        ntvfs_caps,
 293                                        req->smb_conn->connection->event.ctx,
 294                                        req->smb_conn->connection->msg_ctx,
 295                                        req->smb_conn->lp_ctx,
 296                                        req->smb_conn->connection->server_id,
 297                                        &tcon->ntvfs);
 298         if (!NT_STATUS_IS_OK(status)) {
 299                 DEBUG(0, ("smb2srv_tcon_backend: ntvfs_init_connection failed for service %s\n",
 300                           scfg->name));
 301                 goto failed;
 302         }
 303
 304         status = ntvfs_set_oplock_handler(tcon->ntvfs, smb2srv_send_oplock_break, tcon);
 305         if (!NT_STATUS_IS_OK(status)) {
 306                 DEBUG(0,("smb2srv_tcon_backend: NTVFS failed to set the oplock handler!\n"));
 307                 goto failed;
 308         }
 309
 310         status = ntvfs_set_addr_callbacks(tcon->ntvfs, smbsrv_get_my_addr, smbsrv_get_peer_addr, req->smb_conn);
 311         if (!NT_STATUS_IS_OK(status)) {
 312                 DEBUG(0,("smb2srv_tcon_backend: NTVFS failed to set the addr callbacks!\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!\n"));
 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         uint16_t credit;
 364
 365         if (!NT_STATUS_IS_OK(req->status)) {
 366                 smb2srv_send_error(req, req->status);
 367                 return;
 368         }
 369         if (io->smb2.out.share_type == NTVFS_IPC) {
 370                 /* if it's an IPC share vista returns 0x0005 */
 371                 credit = 0x0005;
 372         } else {
 373                 credit = 0x0001;
 374         }
 375
 376         SMB2SRV_CHECK(smb2srv_setup_reply(req, 0x10, false, 0));
 377
 378         SIVAL(req->out.hdr,     SMB2_HDR_TID,   io->smb2.out.tid);
 379         SSVAL(req->out.hdr,     SMB2_HDR_CREDIT,credit);
 380
 381         SCVAL(req->out.body,    0x02,           io->smb2.out.share_type);
 382         SCVAL(req->out.body,    0x03,           io->smb2.out.reserved);
 383         SIVAL(req->out.body,    0x04,           io->smb2.out.flags);
 384         SIVAL(req->out.body,    0x08,           io->smb2.out.capabilities);
 385         SIVAL(req->out.body,    0x0C,           io->smb2.out.access_mask);
 386
 387         smb2srv_send_reply(req);
 388 }
 389
 390 void smb2srv_tcon_recv(struct smb2srv_request *req)
 391 {
 392         union smb_tcon *io;
 393
 394         SMB2SRV_CHECK_BODY_SIZE(req, 0x08, true);
 395         SMB2SRV_TALLOC_IO_PTR(io, union smb_tcon);
 396
 397         io->smb2.level          = RAW_TCON_SMB2;
 398         io->smb2.in.reserved    = SVAL(req->in.body, 0x02);
 399         SMB2SRV_CHECK(smb2_pull_o16s16_string(&req->in, io, req->in.body+0x04, &io->smb2.in.path));
 400
 401         /* the VFS backend does not yet handle NULL paths */
 402         if (io->smb2.in.path == NULL) {
 403                 io->smb2.in.path = "";
 404         }
 405
 406         req->status = smb2srv_tcon_backend(req, io);
 407
 408         if (req->control_flags & SMB2SRV_REQ_CTRL_FLAG_NOT_REPLY) {
 409                 talloc_free(req);
 410                 return;
 411         }
 412         smb2srv_tcon_send(req, io);
 413 }
 414
 415 static NTSTATUS smb2srv_tdis_backend(struct smb2srv_request *req)
 416 {
 417         /* TODO: call ntvfs backends to close file of this tcon */
 418         talloc_free(req->tcon);
 419         req->tcon = NULL;
 420         return NT_STATUS_OK;
 421 }
 422
 423 static void smb2srv_tdis_send(struct smb2srv_request *req)
 424 {
 425         NTSTATUS status;
 426
 427         if (NT_STATUS_IS_ERR(req->status)) {
 428                 smb2srv_send_error(req, req->status);
 429                 return;
 430         }
 431
 432         status = smb2srv_setup_reply(req, 0x04, false, 0);
 433         if (!NT_STATUS_IS_OK(status)) {
 434                 smbsrv_terminate_connection(req->smb_conn, nt_errstr(status));
 435                 talloc_free(req);
 436                 return;
 437         }
 438
 439         SSVAL(req->out.body, 0x02, 0);
 440
 441         smb2srv_send_reply(req);
 442 }
 443
 444 void smb2srv_tdis_recv(struct smb2srv_request *req)
 445 {
 446         uint16_t _pad;
 447
 448         SMB2SRV_CHECK_BODY_SIZE(req, 0x04, false);
 449
 450         _pad    = SVAL(req->in.body, 0x02);
 451
 452         req->status = smb2srv_tdis_backend(req);
 453
 454         if (req->control_flags & SMB2SRV_REQ_CTRL_FLAG_NOT_REPLY) {
 455                 talloc_free(req);
 456                 return;
 457         }
 458         smb2srv_tdis_send(req);
 459 }