source4/smb_server/smb_server.h

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    Copyright (C) Andrew Tridgell              2003
   5    Copyright (C) James J Myers                2003 <myersjj@samba.org>
   6    Copyright (C) Stefan Metzmacher            2004-2005
   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 "libcli/raw/request.h"
  23 #include "libcli/raw/interfaces.h"
  24 #include "lib/socket/socket.h"
  25 #include "libds/common/roles.h"
  26 #include "../lib/util/dlinklist.h"
  27 #include "../librpc/gen_ndr/nbt.h"
  28
  29 struct tevent_context;
  30
  31 /*
  32   this header declares the core context structures associated with smb
  33   sockets, tree connects, requests etc
  34
  35   the idea is that we will eventually get rid of all our global
  36   variables and instead store our state from structures hanging off
  37   these basic elements
  38 */
  39
  40 struct smbsrv_tcons_context {
  41         /* an id tree used to allocate tids */
  42         struct idr_context *idtree_tid;
  43
  44         /* this is the limit of vuid values for this connection */
  45         uint32_t idtree_limit;
  46
  47         /* list of open tree connects */
  48         struct smbsrv_tcon *list;
  49 };
  50
  51 struct smbsrv_sessions_context {
  52         /* an id tree used to allocate vuids */
  53         /* this holds info on session vuids that are already
  54          * validated for this VC */
  55         struct idr_context *idtree_vuid;
  56
  57         /* this is the limit of vuid values for this connection */
  58         uint64_t idtree_limit;
  59
  60         /* also kept as a link list so it can be enumerated by
  61            the management code */
  62         struct smbsrv_session *list;
  63 };
  64
  65 struct smbsrv_handles_context {
  66         /* an id tree used to allocate file handles */
  67         struct idr_context *idtree_hid;
  68
  69         /* this is the limit of handle values for this context */
  70         uint64_t idtree_limit;
  71
  72         /* also kept as a link list so it can be enumerated by
  73            the management code */
  74         struct smbsrv_handle *list;
  75 };
  76
  77 /* the current user context for a request */
  78 struct smbsrv_session {
  79         struct smbsrv_session *prev, *next;
  80
  81         struct smbsrv_connection *smb_conn;
  82
  83         /*
  84          * in SMB2 tcons belong to just one session
  85          * and not to the whole connection
  86          */
  87         struct smbsrv_tcons_context smb2_tcons;
  88
  89         /*
  90          * the open file handles for this session,
  91          * used for SMBexit, SMBulogoff and SMB2 SessionLogoff
  92          */
  93         struct smbsrv_handle_session_item *handles;
  94
  95         /*
  96          * an index passed over the wire:
  97          * - 16 bit for smb
  98          * - 64 bit for smb2
  99          */
 100         uint64_t vuid;
 101
 102         struct gensec_security *gensec_ctx;
 103
 104         struct auth_session_info *session_info;
 105
 106         struct {
 107                 bool required;
 108                 bool active;
 109         } smb2_signing;
 110
 111         /* some statistics for the management tools */
 112         struct {
 113                 /* the time when the session setup started */
 114                 struct timeval connect_time;
 115                 /* the time when the session setup was finished */
 116                 struct timeval auth_time;
 117                 /* the time when the last request comes in */
 118                 struct timeval last_request_time;
 119         } statistics;
 120 };
 121
 122 /* we need a forward declaration of the ntvfs_ops strucutre to prevent
 123    include recursion */
 124 struct ntvfs_context;
 125
 126 struct smbsrv_tcon {
 127         struct smbsrv_tcon *next, *prev;
 128
 129         /* the server context that this was created on */
 130         struct smbsrv_connection *smb_conn;
 131
 132         /* the open file handles on this tcon */
 133         struct smbsrv_handles_context handles;
 134
 135         /*
 136          * an index passed over the wire:
 137          * - 16 bit for smb
 138          * - 32 bit for smb2
 139          */
 140         uint32_t tid; /* an index passed over the wire (the TID) */
 141
 142         /* the share name */
 143         const char *share_name;
 144
 145         /* the NTVFS context - see source/ntvfs/ for details */
 146         struct ntvfs_context *ntvfs;
 147
 148         /* some stuff to support share level security */
 149         struct {
 150                 /* in share level security we need to fake up a session */
 151                 struct smbsrv_session *session;
 152         } sec_share;
 153
 154         /* some stuff to support share level security */
 155         struct {
 156                 /* in SMB2 a tcon always belongs to one session */
 157                 struct smbsrv_session *session;
 158         } smb2;
 159
 160         /* some statistics for the management tools */
 161         struct {
 162                 /* the time when the tree connect started */
 163                 struct timeval connect_time;
 164                 /* the time when the last request comes in */
 165                 struct timeval last_request_time;
 166         } statistics;
 167 };
 168
 169 struct smbsrv_handle {
 170         struct smbsrv_handle *next, *prev;
 171
 172         /* the tcon the handle belongs to */
 173         struct smbsrv_tcon *tcon;
 174
 175         /* the session the handle was opened on */
 176         struct smbsrv_session *session;
 177
 178         /* the smbpid used on the open, used for SMBexit */
 179         uint16_t smbpid;
 180
 181         /*
 182          * this is for adding the handle into a linked list
 183          * on the smbsrv_session, we can't use *next,*prev
 184          * for this because they're used for the linked list on the
 185          * smbsrv_tcon
 186          */
 187         struct smbsrv_handle_session_item {
 188                 struct smbsrv_handle_session_item *prev, *next;
 189                 struct smbsrv_handle *handle;
 190         } session_item;
 191
 192         /*
 193          * the value passed over the wire
 194          * - 16 bit for smb
 195          * - 32 bit for smb2
 196          *   Note: for SMB2 handles are 128 bit
 197          *         we'll fill them with
 198          *         - 32 bit HID
 199          *         - 32 bit TID
 200          *         - 64 bit VUID
 201          */
 202         uint32_t hid;
 203
 204         /*
 205          * the ntvfs handle passed to the ntvfs backend
 206          */
 207         struct ntvfs_handle *ntvfs;
 208
 209         /* some statistics for the management tools */
 210         struct {
 211                 /* the time when the tree connect started */
 212                 struct timeval open_time;
 213                 /* the time when the last request comes in */
 214                 struct timeval last_use_time;
 215         } statistics;
 216 };
 217
 218 /* a set of flags to control handling of request structures */
 219 #define SMBSRV_REQ_CONTROL_LARGE     (1<<1) /* allow replies larger than max_xmit */
 220
 221 #define SMBSRV_REQ_DEFAULT_STR_FLAGS(req) (((req)->flags2 & FLAGS2_UNICODE_STRINGS) ? STR_UNICODE : STR_ASCII)
 222
 223 /* the context for a single SMB request. This is passed to any request-context
 224    functions */
 225 struct smbsrv_request {
 226         /* the smbsrv_connection needs a list of requests queued for send */
 227         struct smbsrv_request *next, *prev;
 228
 229         /* the server_context contains all context specific to this SMB socket */
 230         struct smbsrv_connection *smb_conn;
 231
 232         /* conn is only set for operations that have a valid TID */
 233         struct smbsrv_tcon *tcon;
 234
 235         /* the session context is derived from the vuid */
 236         struct smbsrv_session *session;
 237
 238         /* a set of flags to control usage of the request. See SMBSRV_REQ_CONTROL_* */
 239         uint32_t control_flags;
 240
 241         /* the system time when the request arrived */
 242         struct timeval request_time;
 243
 244         /* a pointer to the per request union smb_* io structure */
 245         void *io_ptr;
 246
 247         /* the ntvfs_request */
 248         struct ntvfs_request *ntvfs;
 249
 250         /* Now the SMB specific stuff */
 251
 252         /* the flags from the SMB request, in raw form (host byte order) */
 253         uint16_t flags2;
 254
 255         /* this can contain a fnum from an earlier part of a chained
 256          * message (such as an SMBOpenX), or -1 */
 257         int chained_fnum;
 258
 259         /* how far through the chain of SMB commands have we gone? */
 260         unsigned chain_count;
 261
 262         /* the sequence number for signing */
 263         uint64_t seq_num;
 264
 265         struct smb_request_buffer in;
 266         struct smb_request_buffer out;
 267 };
 268
 269 /* smb server context structure. This should contain all the state
 270  * information associated with a SMB server connection
 271  */
 272 struct smbsrv_connection {
 273         /* context that has been negotiated between the client and server */
 274         struct {
 275                 /* have we already done the NBT session establishment? */
 276                 bool done_nbt_session;
 277
 278                 /* only one negprot per connection is allowed */
 279                 bool done_negprot;
 280
 281                 /* multiple session setups are allowed, but some parameters are
 282                    ignored in any but the first */
 283                 bool done_sesssetup;
 284
 285                 /*
 286                  * Size of data we can send to client. Set
 287                  *  by the client for all protocols above CORE.
 288                  *  Set by us for CORE protocol.
 289                  */
 290                 unsigned max_send; /* init to BUFFER_SIZE */
 291
 292                 /*
 293                  * Size of the data we can receive. Set by us.
 294                  * Can be modified by the max xmit parameter.
 295                  */
 296                 unsigned max_recv; /* init to BUFFER_SIZE */
 297
 298                 /* the negotiatiated protocol */
 299                 enum protocol_types protocol;
 300
 301                 /* authentication context for multi-part negprot */
 302                 struct auth4_context *auth_context;
 303
 304                 /* reference to the kerberos keytab, or machine trust account */
 305                 struct cli_credentials *server_credentials;
 306
 307                 /* did we tell the client we support encrypted passwords? */
 308                 bool encrypted_passwords;
 309
 310                 /* Did we choose SPNEGO, or perhaps raw NTLMSSP, or even no extended security at all? */
 311                 const char *oid;
 312
 313                 /* client capabilities */
 314                 uint32_t client_caps;
 315
 316                 /* the timezone we sent to the client */
 317                 int zone_offset;
 318
 319                 /* NBT names only set when done_nbt_session is true */
 320                 struct nbt_name *called_name;
 321                 struct nbt_name *calling_name;
 322         } negotiate;
 323
 324         /* the context associated with open tree connects on a smb socket, not for SMB2 */
 325         struct smbsrv_tcons_context smb_tcons;
 326
 327         /* context associated with currently valid session setups */
 328         struct smbsrv_sessions_context sessions;
 329
 330         /*
 331          * the server_context holds a linked list of pending requests,
 332          * this is used for finding the request structures on ntcancel requests
 333          * For SMB only
 334          */
 335         struct smbsrv_request *requests;
 336
 337         /*
 338          * the server_context holds a linked list of pending requests,
 339          * and an idtree for finding the request structures on SMB2 Cancel
 340          * For SMB2 only
 341          */
 342         struct {
 343                 /* an id tree used to allocate ids */
 344                 struct idr_context *idtree_req;
 345
 346                 /* this is the limit of pending requests values for this connection */
 347                 uint32_t idtree_limit;
 348
 349                 /* list of open tree connects */
 350                 struct smb2srv_request *list;
 351         } requests2;
 352
 353         struct smb_signing_context signing;
 354
 355         struct stream_connection *connection;
 356
 357         /* this holds a partially received request */
 358         struct packet_context *packet;
 359
 360         /* a list of partially received transaction requests */
 361         struct smbsrv_trans_partial {
 362                 struct smbsrv_trans_partial *next, *prev;
 363                 struct smbsrv_request *req;
 364                 uint8_t command;
 365                 union {
 366                         struct smb_trans2 *trans;
 367                         struct smb_nttrans *nttrans;
 368                 } u;
 369         } *trans_partial;
 370
 371         /* configuration parameters */
 372         struct {
 373                 enum security_types security;
 374                 bool nt_status_support;
 375         } config;
 376
 377         /* some statictics for the management tools */
 378         struct {
 379                 /* the time when the client connects */
 380                 struct timeval connect_time;
 381                 /* the time when the last request comes in */
 382                 struct timeval last_request_time;
 383         } statistics;
 384
 385         struct share_context *share_context;
 386
 387         struct loadparm_context *lp_ctx;
 388
 389         bool smb2_signing_required;
 390
 391         uint64_t highest_smb2_seqnum;
 392 };
 393
 394 struct model_ops;
 395 struct loadparm_context;
 396
 397 NTSTATUS smbsrv_add_socket(TALLOC_CTX *mem_ctx,
 398                            struct tevent_context *event_context,
 399                            struct loadparm_context *lp_ctx,
 400                            const struct model_ops *model_ops,
 401                            const char *address);
 402
 403 struct loadparm_context;
 404
 405 #include "smb_server/smb_server_proto.h"
 406 #include "smb_server/smb/smb_proto.h"
 407
 408 /* useful way of catching wct errors with file and line number */
 409 #define SMBSRV_CHECK_WCT(req, wcount) do { \
 410         if ((req)->in.wct != (wcount)) { \
 411                 DEBUG(1,("Unexpected WCT %u at %s(%d) - expected %d\n", \
 412                          (req)->in.wct, __FILE__, __LINE__, wcount)); \
 413                 smbsrv_send_error(req, NT_STATUS_DOS(ERRSRV, ERRerror)); \
 414                 return; \
 415         } \
 416 } while (0)
 417
 418 /* useful wrapper for talloc with NO_MEMORY reply */
 419 #define SMBSRV_TALLOC_IO_PTR(ptr, type) do { \
 420         ptr = talloc(req, type); \
 421         if (!ptr) { \
 422                 smbsrv_send_error(req, NT_STATUS_NO_MEMORY); \
 423                 return; \
 424         } \
 425         req->io_ptr = ptr; \
 426 } while (0)
 427
 428 #define SMBSRV_SETUP_NTVFS_REQUEST(send_fn, state) do { \
 429         req->ntvfs = ntvfs_request_create(req->tcon->ntvfs, req, \
 430                                           req->session->session_info,\
 431                                           SVAL(req->in.hdr,HDR_PID), \
 432                                           req->request_time, \
 433                                           req, send_fn, state); \
 434         if (!req->ntvfs) { \
 435                 smbsrv_send_error(req, NT_STATUS_NO_MEMORY); \
 436                 return; \
 437         } \
 438         (void)talloc_steal(req->tcon->ntvfs, req); \
 439         req->ntvfs->frontend_data.private_data = req; \
 440 } while (0)
 441
 442 #define SMBSRV_CHECK_FILE_HANDLE(handle) do { \
 443         if (!handle) { \
 444                 smbsrv_send_error(req, NT_STATUS_INVALID_HANDLE); \
 445                 return; \
 446         } \
 447 } while (0)
 448
 449 #define SMBSRV_CHECK_FILE_HANDLE_ERROR(handle, _status) do { \
 450         if (!handle) { \
 451                 smbsrv_send_error(req, _status); \
 452                 return; \
 453         } \
 454 } while (0)
 455
 456 #define SMBSRV_CHECK_FILE_HANDLE_NTSTATUS(handle) do { \
 457         if (!handle) { \
 458                 return NT_STATUS_INVALID_HANDLE; \
 459         } \
 460 } while (0)
 461
 462 #define SMBSRV_CHECK(cmd) do {\
 463         NTSTATUS _status; \
 464         _status = cmd; \
 465         if (!NT_STATUS_IS_OK(_status)) { \
 466                 smbsrv_send_error(req,  _status); \
 467                 return; \
 468         } \
 469 } while (0)
 470
 471 /*
 472    check if the backend wants to handle the request asynchronously.
 473    if it wants it handled synchronously then call the send function
 474    immediately
 475 */
 476 #define SMBSRV_CALL_NTVFS_BACKEND(cmd) do { \
 477         req->ntvfs->async_states->status = cmd; \
 478         if (req->ntvfs->async_states->state & NTVFS_ASYNC_STATE_ASYNC) { \
 479                 DLIST_ADD_END(req->smb_conn->requests, req, struct smbsrv_request *); \
 480         } else { \
 481                 req->ntvfs->async_states->send_fn(req->ntvfs); \
 482         } \
 483 } while (0)
 484
 485 /* check req->ntvfs->async_states->status and if not OK then send an error reply */
 486 #define SMBSRV_CHECK_ASYNC_STATUS_ERR_SIMPLE do { \
 487         req = talloc_get_type(ntvfs->async_states->private_data, struct smbsrv_request); \
 488         if (ntvfs->async_states->state & NTVFS_ASYNC_STATE_CLOSE || NT_STATUS_EQUAL(ntvfs->async_states->status, NT_STATUS_NET_WRITE_FAULT)) { \
 489                 smbsrv_terminate_connection(req->smb_conn, get_friendly_nt_error_msg (ntvfs->async_states->status)); \
 490                 talloc_free(req); \
 491                 return; \
 492         } \
 493         if (NT_STATUS_IS_ERR(ntvfs->async_states->status)) { \
 494                 smbsrv_send_error(req, ntvfs->async_states->status); \
 495                 return; \
 496         } \
 497 } while (0)
 498 #define SMBSRV_CHECK_ASYNC_STATUS_ERR(ptr, type) do { \
 499         SMBSRV_CHECK_ASYNC_STATUS_ERR_SIMPLE; \
 500         ptr = talloc_get_type(req->io_ptr, type); \
 501 } while (0)
 502 #define SMBSRV_CHECK_ASYNC_STATUS_SIMPLE do { \
 503         req = talloc_get_type(ntvfs->async_states->private_data, struct smbsrv_request); \
 504         if (ntvfs->async_states->state & NTVFS_ASYNC_STATE_CLOSE || NT_STATUS_EQUAL(ntvfs->async_states->status, NT_STATUS_NET_WRITE_FAULT)) { \
 505                 smbsrv_terminate_connection(req->smb_conn, get_friendly_nt_error_msg (ntvfs->async_states->status)); \
 506                 talloc_free(req); \
 507                 return; \
 508         } \
 509         if (!NT_STATUS_IS_OK(ntvfs->async_states->status)) { \
 510                 smbsrv_send_error(req, ntvfs->async_states->status); \
 511                 return; \
 512         } \
 513 } while (0)
 514 #define SMBSRV_CHECK_ASYNC_STATUS(ptr, type) do { \
 515         SMBSRV_CHECK_ASYNC_STATUS_SIMPLE; \
 516         ptr = talloc_get_type(req->io_ptr, type); \
 517 } while (0)
 518
 519 /* zero out some reserved fields in a reply */
 520 #define SMBSRV_VWV_RESERVED(start, count) memset(req->out.vwv + VWV(start), 0, (count)*2)
 521
 522 #include "smb_server/service_smb_proto.h"