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 2 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, write to the Free Software
  20    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21 */
  22
  23 #include "libcli/raw/request.h"
  24 #include "libcli/raw/interfaces.h"
  25 #include "lib/events/events.h"
  26 #include "lib/socket/socket.h"
  27 #include "lib/util/dlinklist.h"
  28
  29 /*
  30   this header declares the core context structures associated with smb
  31   sockets, tree connects, requests etc
  32
  33   the idea is that we will eventually get rid of all our global
  34   variables and instead store our state from structures hanging off
  35   these basic elements
  36 */
  37
  38 struct smbsrv_tcons_context {
  39         /* an id tree used to allocate tids */
  40         struct idr_context *idtree_tid;
  41
  42         /* this is the limit of vuid values for this connection */
  43         uint32_t idtree_limit;
  44
  45         /* list of open tree connects */
  46         struct smbsrv_tcon *list;
  47 };
  48
  49 struct smbsrv_sessions_context {
  50         /* an id tree used to allocate vuids */
  51         /* this holds info on session vuids that are already
  52          * validated for this VC */
  53         struct idr_context *idtree_vuid;
  54
  55         /* this is the limit of vuid values for this connection */
  56         uint64_t idtree_limit;
  57
  58         /* also kept as a link list so it can be enumerated by
  59            the management code */
  60         struct smbsrv_session *list;
  61 };
  62
  63 struct smbsrv_handles_context {
  64         /* an id tree used to allocate file handles */
  65         struct idr_context *idtree_hid;
  66
  67         /* this is the limit of handle values for this context */
  68         uint64_t idtree_limit;
  69
  70         /* also kept as a link list so it can be enumerated by
  71            the management code */
  72         struct smbsrv_handle *list;
  73 };
  74
  75 /* the current user context for a request */
  76 struct smbsrv_session {
  77         struct smbsrv_session *prev, *next;
  78
  79         struct smbsrv_connection *smb_conn;
  80
  81         /*
  82          * in SMB2 tcons belong to just one session
  83          * and not to the whole connection
  84          */
  85         struct smbsrv_tcons_context smb2_tcons;
  86
  87         /*
  88          * the open file handles for this session,
  89          * used for SMBexit, SMBulogoff and SMB2 SessionLogoff
  90          */
  91         struct smbsrv_handle_session_item *handles;
  92
  93         /*
  94          * an index passed over the wire:
  95          * - 16 bit for smb
  96          * - 64 bit for smb2
  97          */
  98         uint64_t vuid;
  99
 100         struct gensec_security *gensec_ctx;
 101
 102         struct auth_session_info *session_info;
 103
 104         /* some statistics for the management tools */
 105         struct {
 106                 /* the time when the session setup started */
 107                 struct timeval connect_time;
 108                 /* the time when the session setup was finished */
 109                 struct timeval auth_time;
 110                 /* the time when the last request comes in */
 111                 struct timeval last_request_time;
 112         } statistics;
 113 };
 114
 115 /* we need a forward declaration of the ntvfs_ops strucutre to prevent
 116    include recursion */
 117 struct ntvfs_context;
 118
 119 struct smbsrv_tcon {
 120         struct smbsrv_tcon *next, *prev;
 121
 122         /* the server context that this was created on */
 123         struct smbsrv_connection *smb_conn;
 124
 125         /* the open file handles on this tcon */
 126         struct smbsrv_handles_context handles;
 127
 128         /*
 129          * an index passed over the wire:
 130          * - 16 bit for smb
 131          * - 32 bit for smb2
 132          */
 133         uint32_t tid; /* an index passed over the wire (the TID) */
 134
 135         /* the share name */
 136         const char *share_name;
 137
 138         /* the NTVFS context - see source/ntvfs/ for details */
 139         struct ntvfs_context *ntvfs;
 140
 141         /* some stuff to support share level security */
 142         struct {
 143                 /* in share level security we need to fake up a session */
 144                 struct smbsrv_session *session;
 145         } sec_share;
 146
 147         /* some stuff to support share level security */
 148         struct {
 149                 /* in SMB2 a tcon always belongs to one session */
 150                 struct smbsrv_session *session;
 151         } smb2;
 152
 153         /* some statistics for the management tools */
 154         struct {
 155                 /* the time when the tree connect started */
 156                 struct timeval connect_time;
 157                 /* the time when the last request comes in */
 158                 struct timeval last_request_time;
 159         } statistics;
 160 };
 161
 162 struct smbsrv_handle {
 163         struct smbsrv_handle *next, *prev;
 164
 165         /* the tcon the handle belongs to */
 166         struct smbsrv_tcon *tcon;
 167
 168         /* the session the handle was opened on */
 169         struct smbsrv_session *session;
 170
 171         /* the smbpid used on the open, used for SMBexit */
 172         uint16_t smbpid;
 173
 174         /*
 175          * this is for adding the handle into a linked list
 176          * on the smbsrv_session, we can't use *next,*prev
 177          * for this because they're used for the linked list on the
 178          * smbsrv_tcon
 179          */
 180         struct smbsrv_handle_session_item {
 181                 struct smbsrv_handle_session_item *prev, *next;
 182                 struct smbsrv_handle *handle;
 183         } session_item;
 184
 185         /*
 186          * the value passed over the wire
 187          * - 16 bit for smb
 188          * - 64 bit for smb2
 189          *   Note: for SMB2 handles are 128 bit
 190          *         we'll fill the 2nd 64 bit with:
 191          *         - 32 bit TID
 192          *         - 32 bit 0xFFFFFFFF
 193          */
 194         uint64_t hid;
 195
 196         /*
 197          * the ntvfs handle passed to the ntvfs backend
 198          */
 199         struct ntvfs_handle *ntvfs;
 200
 201         /* some statistics for the management tools */
 202         struct {
 203                 /* the time when the tree connect started */
 204                 struct timeval open_time;
 205                 /* the time when the last request comes in */
 206                 struct timeval last_use_time;
 207         } statistics;
 208 };
 209
 210 /* a set of flags to control handling of request structures */
 211 #define SMBSRV_REQ_CONTROL_LARGE     (1<<1) /* allow replies larger than max_xmit */
 212
 213 #define SMBSRV_REQ_DEFAULT_STR_FLAGS(req) (((req)->flags2 & FLAGS2_UNICODE_STRINGS) ? STR_UNICODE : STR_ASCII)
 214
 215 /* the context for a single SMB request. This is passed to any request-context
 216    functions */
 217 struct smbsrv_request {
 218         /* the smbsrv_connection needs a list of requests queued for send */
 219         struct smbsrv_request *next, *prev;
 220
 221         /* the server_context contains all context specific to this SMB socket */
 222         struct smbsrv_connection *smb_conn;
 223
 224         /* conn is only set for operations that have a valid TID */
 225         struct smbsrv_tcon *tcon;
 226
 227         /* the session context is derived from the vuid */
 228         struct smbsrv_session *session;
 229
 230         /* a set of flags to control usage of the request. See SMBSRV_REQ_CONTROL_* */
 231         uint32_t control_flags;
 232
 233         /* the system time when the request arrived */
 234         struct timeval request_time;
 235
 236         /* a pointer to the per request union smb_* io structure */
 237         void *io_ptr;
 238
 239         /* the ntvfs_request */
 240         struct ntvfs_request *ntvfs;
 241
 242         /* Now the SMB specific stuff */
 243
 244         /* the flags from the SMB request, in raw form (host byte order) */
 245         uint16_t flags2;
 246
 247         /* this can contain a fnum from an earlier part of a chained
 248          * message (such as an SMBOpenX), or -1 */
 249         int chained_fnum;
 250
 251         /* how far through the chain of SMB commands have we gone? */
 252         unsigned chain_count;
 253
 254         /* the sequence number for signing */
 255         uint64_t seq_num;
 256
 257         struct request_buffer in;
 258         struct request_buffer out;
 259 };
 260
 261 enum security_types {SEC_SHARE,SEC_USER};
 262
 263 /* smb server context structure. This should contain all the state
 264  * information associated with a SMB server connection
 265  */
 266 struct smbsrv_connection {
 267         /* context that has been negotiated between the client and server */
 268         struct {
 269                 /* have we already done the NBT session establishment? */
 270                 BOOL done_nbt_session;
 271
 272                 /* only one negprot per connection is allowed */
 273                 BOOL done_negprot;
 274
 275                 /* multiple session setups are allowed, but some parameters are
 276                    ignored in any but the first */
 277                 BOOL done_sesssetup;
 278
 279                 /*
 280                  * Size of data we can send to client. Set
 281                  *  by the client for all protocols above CORE.
 282                  *  Set by us for CORE protocol.
 283                  */
 284                 unsigned max_send; /* init to BUFFER_SIZE */
 285
 286                 /*
 287                  * Size of the data we can receive. Set by us.
 288                  * Can be modified by the max xmit parameter.
 289                  */
 290                 unsigned max_recv; /* init to BUFFER_SIZE */
 291
 292                 /* the negotiatiated protocol */
 293                 enum protocol_types protocol;
 294
 295                 /* authentication context for multi-part negprot */
 296                 struct auth_context *auth_context;
 297
 298                 /* reference to the kerberos keytab, or machine trust account */
 299                 struct cli_credentials *server_credentials;
 300
 301                 /* did we tell the client we support encrypted passwords? */
 302                 BOOL encrypted_passwords;
 303
 304                 /* Did we choose SPNEGO, or perhaps raw NTLMSSP, or even no extended security at all? */
 305                 const char *oid;
 306
 307                 /* client capabilities */
 308                 uint32_t client_caps;
 309
 310                 /* the timezone we sent to the client */
 311                 int zone_offset;
 312
 313                 /* NBT names only set when done_nbt_session is true */
 314                 struct nbt_name *called_name;
 315                 struct nbt_name *calling_name;
 316         } negotiate;
 317
 318         /* the context associated with open tree connects on a smb socket, not for SMB2 */
 319         struct smbsrv_tcons_context smb_tcons;
 320
 321         /* context associated with currently valid session setups */
 322         struct smbsrv_sessions_context sessions;
 323
 324         /*
 325          * the server_context holds a linked list of pending requests,
 326          * this is used for finding the request structures on ntcancel requests
 327          * For SMB only
 328          */
 329         struct smbsrv_request *requests;
 330
 331         /*
 332          * the server_context holds a linked list of pending requests,
 333          * and an idtree for finding the request structures on SMB2 Cancel
 334          * For SMB2 only
 335          */
 336         struct {
 337                 /* an id tree used to allocate ids */
 338                 struct idr_context *idtree_req;
 339
 340                 /* this is the limit of pending requests values for this connection */
 341                 uint32_t idtree_limit;
 342
 343                 /* list of open tree connects */
 344                 struct smb2srv_request *list;
 345         } requests2;
 346
 347         struct smb_signing_context signing;
 348
 349         struct stream_connection *connection;
 350
 351         /* this holds a partially received request */
 352         struct packet_context *packet;
 353
 354         /* a list of partially received transaction requests */
 355         struct smbsrv_trans_partial {
 356                 struct smbsrv_trans_partial *next, *prev;
 357                 struct smbsrv_request *req;
 358                 struct smb_trans2 *trans;
 359                 uint8_t command;
 360         } *trans_partial;
 361
 362         /* configuration parameters */
 363         struct {
 364                 enum security_types security;
 365                 BOOL nt_status_support;
 366         } config;
 367
 368         /* some statictics for the management tools */
 369         struct {
 370                 /* the time when the client connects */
 371                 struct timeval connect_time;
 372                 /* the time when the last request comes in */
 373                 struct timeval last_request_time;
 374         } statistics;
 375
 376         struct share_context *share_context;
 377 };
 378
 379 #include "smb_server/smb_server_proto.h"
 380 #include "smb_server/smb/smb_proto.h"
 381
 382 /* useful way of catching wct errors with file and line number */
 383 #define SMBSRV_CHECK_WCT(req, wcount) do { \
 384         if ((req)->in.wct != (wcount)) { \
 385                 DEBUG(1,("Unexpected WCT %u at %s(%d) - expected %d\n", \
 386                          (req)->in.wct, __FILE__, __LINE__, wcount)); \
 387                 smbsrv_send_error(req, NT_STATUS_DOS(ERRSRV, ERRerror)); \
 388                 return; \
 389         } \
 390 } while (0)
 391
 392 /* useful wrapper for talloc with NO_MEMORY reply */
 393 #define SMBSRV_TALLOC_IO_PTR(ptr, type) do { \
 394         ptr = talloc(req, type); \
 395         if (!ptr) { \
 396                 smbsrv_send_error(req, NT_STATUS_NO_MEMORY); \
 397                 return; \
 398         } \
 399         req->io_ptr = ptr; \
 400 } while (0)
 401
 402 #define SMBSRV_SETUP_NTVFS_REQUEST(send_fn, state) do { \
 403         req->ntvfs = ntvfs_request_create(req->tcon->ntvfs, req, \
 404                                           req->session->session_info,\
 405                                           SVAL(req->in.hdr,HDR_PID), \
 406                                           req->request_time, \
 407                                           req, send_fn, state); \
 408         if (!req->ntvfs) { \
 409                 smbsrv_send_error(req, NT_STATUS_NO_MEMORY); \
 410                 return; \
 411         } \
 412         (void)talloc_steal(req->tcon->ntvfs, req); \
 413         req->ntvfs->frontend_data.private_data = req; \
 414 } while (0)
 415
 416 #define SMBSRV_CHECK_FILE_HANDLE(handle) do { \
 417         if (!handle) { \
 418                 smbsrv_send_error(req, NT_STATUS_INVALID_HANDLE); \
 419                 return; \
 420         } \
 421 } while (0)
 422
 423 #define SMBSRV_CHECK_FILE_HANDLE_ERROR(handle, _status) do { \
 424         if (!handle) { \
 425                 smbsrv_send_error(req, _status); \
 426                 return; \
 427         } \
 428 } while (0)
 429
 430 #define SMBSRV_CHECK_FILE_HANDLE_NTSTATUS(handle) do { \
 431         if (!handle) { \
 432                 return NT_STATUS_INVALID_HANDLE; \
 433         } \
 434 } while (0)
 435
 436 #define SMBSRV_CHECK(cmd) do {\
 437         NTSTATUS _status; \
 438         _status = cmd; \
 439         if (!NT_STATUS_IS_OK(_status)) { \
 440                 smbsrv_send_error(req,  _status); \
 441                 return; \
 442         } \
 443 } while (0)
 444
 445 /*
 446    check if the backend wants to handle the request asynchronously.
 447    if it wants it handled synchronously then call the send function
 448    immediately
 449 */
 450 #define SMBSRV_CALL_NTVFS_BACKEND(cmd) do { \
 451         req->ntvfs->async_states->status = cmd; \
 452         if (req->ntvfs->async_states->state & NTVFS_ASYNC_STATE_ASYNC) { \
 453                 DLIST_ADD_END(req->smb_conn->requests, req, struct smbsrv_request *); \
 454         } else { \
 455                 req->ntvfs->async_states->send_fn(req->ntvfs); \
 456         } \
 457 } while (0)
 458
 459 /* check req->ntvfs->async_states->status and if not OK then send an error reply */
 460 #define SMBSRV_CHECK_ASYNC_STATUS_ERR_SIMPLE do { \
 461         req = talloc_get_type(ntvfs->async_states->private_data, struct smbsrv_request); \
 462         if (NT_STATUS_IS_ERR(ntvfs->async_states->status)) { \
 463                 smbsrv_send_error(req, ntvfs->async_states->status); \
 464                 return; \
 465         } \
 466 } while (0)
 467 #define SMBSRV_CHECK_ASYNC_STATUS_ERR(ptr, type) do { \
 468         SMBSRV_CHECK_ASYNC_STATUS_ERR_SIMPLE; \
 469         ptr = talloc_get_type(req->io_ptr, type); \
 470 } while (0)
 471 #define SMBSRV_CHECK_ASYNC_STATUS_SIMPLE do { \
 472         req = talloc_get_type(ntvfs->async_states->private_data, struct smbsrv_request); \
 473         if (!NT_STATUS_IS_OK(ntvfs->async_states->status)) { \
 474                 smbsrv_send_error(req, ntvfs->async_states->status); \
 475                 return; \
 476         } \
 477 } while (0)
 478 #define SMBSRV_CHECK_ASYNC_STATUS(ptr, type) do { \
 479         SMBSRV_CHECK_ASYNC_STATUS_SIMPLE; \
 480         ptr = talloc_get_type(req->io_ptr, type); \
 481 } while (0)
 482
 483 /* zero out some reserved fields in a reply */
 484 #define SMBSRV_VWV_RESERVED(start, count) memset(req->out.vwv + VWV(start), 0, (count)*2)