source4/rpc_server/dcerpc_server.h

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    server side dcerpc defines
   5
   6    Copyright (C) Andrew Tridgell 2003-2005
   7    Copyright (C) Stefan (metze) Metzmacher 2004-2005
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21 */
  22
  23 #ifndef SAMBA_DCERPC_SERVER_H
  24 #define SAMBA_DCERPC_SERVER_H
  25
  26 #include "librpc/gen_ndr/server_id.h"
  27 #include "librpc/rpc/dcerpc.h"
  28 #include "librpc/ndr/libndr.h"
  29
  30 /* modules can use the following to determine if the interface has changed
  31  * please increment the version number after each interface change
  32  * with a comment and maybe update struct dcesrv_critical_sizes.
  33  */
  34 /* version 1 - initial version - metze */
  35 #define DCERPC_MODULE_VERSION 1
  36
  37 struct dcesrv_connection;
  38 struct dcesrv_call_state;
  39 struct dcesrv_auth;
  40 struct dcesrv_connection_context;
  41
  42 struct dcesrv_interface {
  43         const char *name;
  44         struct ndr_syntax_id syntax_id;
  45
  46         /* this function is called when the client binds to this interface  */
  47         NTSTATUS (*bind)(struct dcesrv_call_state *, const struct dcesrv_interface *, uint32_t if_version);
  48
  49         /* this function is called when the client disconnects the endpoint */
  50         void (*unbind)(struct dcesrv_connection_context *, const struct dcesrv_interface *);
  51
  52         /* the ndr_pull function for the chosen interface.
  53          */
  54         NTSTATUS (*ndr_pull)(struct dcesrv_call_state *, TALLOC_CTX *, struct ndr_pull *, void **);
  55
  56         /* the dispatch function for the chosen interface.
  57          */
  58         NTSTATUS (*dispatch)(struct dcesrv_call_state *, TALLOC_CTX *, void *);
  59
  60         /* the reply function for the chosen interface.
  61          */
  62         NTSTATUS (*reply)(struct dcesrv_call_state *, TALLOC_CTX *, void *);
  63
  64         /* the ndr_push function for the chosen interface.
  65          */
  66         NTSTATUS (*ndr_push)(struct dcesrv_call_state *, TALLOC_CTX *, struct ndr_push *, const void *);
  67
  68         /* for any private use by the interface code */
  69         const void *private_data;
  70 };
  71
  72 enum dcesrv_call_list {
  73         DCESRV_LIST_NONE,
  74         DCESRV_LIST_CALL_LIST,
  75         DCESRV_LIST_FRAGMENTED_CALL_LIST,
  76         DCESRV_LIST_PENDING_CALL_LIST
  77 };
  78
  79 struct data_blob_list_item {
  80         struct data_blob_list_item *prev,*next;
  81         DATA_BLOB blob;
  82 };
  83
  84 /* the state of an ongoing dcerpc call */
  85 struct dcesrv_call_state {
  86         struct dcesrv_call_state *next, *prev;
  87         struct dcesrv_connection *conn;
  88         struct dcesrv_connection_context *context;
  89         struct ncacn_packet pkt;
  90
  91         /*
  92           which list this request is in, if any
  93          */
  94         enum dcesrv_call_list list;
  95
  96         /* the backend can mark the call
  97          * with DCESRV_CALL_STATE_FLAG_ASYNC
  98          * that will cause the frontend to not touch r->out
  99          * and skip the reply
 100          *
 101          * this is only allowed to the backend when DCESRV_CALL_STATE_FLAG_MAY_ASYNC
 102          * is alerady set by the frontend
 103          *
 104          * the backend then needs to call dcesrv_reply() when it's
 105          * ready to send the reply
 106          */
 107 #define DCESRV_CALL_STATE_FLAG_ASYNC (1<<0)
 108 #define DCESRV_CALL_STATE_FLAG_MAY_ASYNC (1<<1)
 109 #define DCESRV_CALL_STATE_FLAG_MULTIPLEXED (1<<3)
 110 #define DCESRV_CALL_STATE_FLAG_PROCESS_PENDING_CALL (1<<4)
 111         uint32_t state_flags;
 112
 113         /* the time the request arrived in the server */
 114         struct timeval time;
 115
 116         /* the backend can use this event context for async replies */
 117         struct tevent_context *event_ctx;
 118
 119         /* the message_context that will be used for async replies */
 120         struct imessaging_context *msg_ctx;
 121
 122         /* this is the pointer to the allocated function struct */
 123         void *r;
 124
 125         /*
 126          * that's the ndr pull context used in dcesrv_request()
 127          * needed by dcesrv_reply() to carry over information
 128          * for full pointer support.
 129          */
 130         struct ndr_pull *ndr_pull;
 131
 132         DATA_BLOB input;
 133
 134         struct data_blob_list_item *replies;
 135
 136         /* this is used by the boilerplate code to generate DCERPC faults */
 137         uint32_t fault_code;
 138
 139         /* the reason why we terminate the connection after sending a response */
 140         const char *terminate_reason;
 141
 142         /* temporary auth_info fields */
 143         struct dcerpc_auth in_auth_info;
 144         struct dcerpc_auth _out_auth_info;
 145         struct dcerpc_auth *out_auth_info;
 146 };
 147
 148 #define DCESRV_HANDLE_ANY 255
 149
 150 /* a dcerpc handle in internal format */
 151 struct dcesrv_handle {
 152         struct dcesrv_handle *next, *prev;
 153         struct dcesrv_assoc_group *assoc_group;
 154         struct policy_handle wire_handle;
 155         struct dom_sid *sid;
 156         const struct dcesrv_interface *iface;
 157         void *data;
 158 };
 159
 160 /* hold the authentication state information */
 161 struct dcesrv_auth {
 162         enum dcerpc_AuthType auth_type;
 163         enum dcerpc_AuthLevel auth_level;
 164         uint32_t auth_context_id;
 165         struct gensec_security *gensec_security;
 166         struct auth_session_info *session_info;
 167         NTSTATUS (*session_key)(struct dcesrv_connection *, DATA_BLOB *session_key);
 168         bool client_hdr_signing;
 169         bool hdr_signing;
 170         bool auth_finished;
 171         bool auth_invalid;
 172 };
 173
 174 struct dcesrv_connection_context {
 175         struct dcesrv_connection_context *next, *prev;
 176         uint16_t context_id;
 177
 178         /* the connection this is on */
 179         struct dcesrv_connection *conn;
 180
 181         /* the ndr function table for the chosen interface */
 182         const struct dcesrv_interface *iface;
 183
 184         /* private data for the interface implementation */
 185         void *private_data;
 186
 187         /*
 188          * the minimum required auth level for this interface
 189          */
 190         enum dcerpc_AuthLevel min_auth_level;
 191         bool allow_connect;
 192
 193         /* the negotiated transfer syntax */
 194         struct ndr_syntax_id transfer_syntax;
 195 };
 196
 197
 198 /* the state associated with a dcerpc server connection */
 199 struct dcesrv_connection {
 200         /* for the broken_connections DLIST */
 201         struct dcesrv_connection *prev, *next;
 202
 203         /* the top level context for this server */
 204         struct dcesrv_context *dce_ctx;
 205
 206         /* the endpoint that was opened */
 207         const struct dcesrv_endpoint *endpoint;
 208
 209         /* a list of established context_ids */
 210         struct dcesrv_connection_context *contexts;
 211
 212         /* the state of the current incoming call fragments */
 213         struct dcesrv_call_state *incoming_fragmented_call_list;
 214
 215         /* the state of the async pending calls */
 216         struct dcesrv_call_state *pending_call_list;
 217
 218         /* the state of the current outgoing calls */
 219         struct dcesrv_call_state *call_list;
 220
 221         /* the maximum size the client wants to receive */
 222         uint16_t max_recv_frag;
 223         uint16_t max_xmit_frag;
 224
 225         DATA_BLOB partial_input;
 226
 227         /* the event_context that will be used for this connection */
 228         struct tevent_context *event_ctx;
 229
 230         /* the message_context that will be used for this connection */
 231         struct imessaging_context *msg_ctx;
 232
 233         /* the server_id that will be used for this connection */
 234         struct server_id server_id;
 235
 236         /* the transport level session key */
 237         DATA_BLOB transport_session_key;
 238
 239         /* is this connection pending termination?  If so, why? */
 240         const char *terminate;
 241
 242         const char *packet_log_dir;
 243
 244         /* this is the default state_flags for dcesrv_call_state structs */
 245         uint32_t state_flags;
 246
 247         struct {
 248                 void *private_data;
 249                 void (*report_output_data)(struct dcesrv_connection *);
 250         } transport;
 251
 252         struct tstream_context *stream;
 253         struct tevent_queue *send_queue;
 254
 255         const struct tsocket_address *local_address;
 256         const struct tsocket_address *remote_address;
 257
 258         /* the current authentication state */
 259         struct dcesrv_auth auth_state;
 260
 261         /*
 262          * remember which pdu types are allowed
 263          */
 264         bool allow_bind;
 265         bool allow_auth3;
 266         bool allow_alter;
 267         bool allow_request;
 268
 269         /* the association group the connection belongs to */
 270         struct dcesrv_assoc_group *assoc_group;
 271
 272         /* The maximum total payload of reassembled request pdus */
 273         size_t max_total_request_size;
 274
 275         /*
 276          * Our preferred transfer syntax.
 277          */
 278         const struct ndr_syntax_id *preferred_transfer;
 279
 280         /* the negotiated bind time features */
 281         uint16_t bind_time_features;
 282 };
 283
 284
 285 struct dcesrv_endpoint_server {
 286         /* this is the name of the endpoint server */
 287         const char *name;
 288
 289         /* this function should register endpoints and some other setup stuff,
 290          * it is called when the dcesrv_context gets initialized.
 291          */
 292         NTSTATUS (*init_server)(struct dcesrv_context *, const struct dcesrv_endpoint_server *);
 293
 294         /* this function can be used by other endpoint servers to
 295          * ask for a dcesrv_interface implementation
 296          * - iface must be reference to an already existing struct !
 297          */
 298         bool (*interface_by_uuid)(struct dcesrv_interface *iface, const struct GUID *, uint32_t);
 299
 300         /* this function can be used by other endpoint servers to
 301          * ask for a dcesrv_interface implementation
 302          * - iface must be reference to an already existeng struct !
 303          */
 304         bool (*interface_by_name)(struct dcesrv_interface *iface, const char *);
 305 };
 306
 307
 308 /* one association groups */
 309 struct dcesrv_assoc_group {
 310         /* the wire id */
 311         uint32_t id;
 312
 313         /* list of handles in this association group */
 314         struct dcesrv_handle *handles;
 315
 316         /* parent context */
 317         struct dcesrv_context *dce_ctx;
 318
 319         /* Remote association group ID (if proxied) */
 320         uint32_t proxied_id;
 321 };
 322
 323 /* server-wide context information for the dcerpc server */
 324 struct dcesrv_context {
 325         /*
 326          * The euid at startup time.
 327          *
 328          * This is required for DCERPC_AUTH_TYPE_NCALRPC_AS_SYSTEM
 329          */
 330         uid_t initial_euid;
 331
 332         /* the list of endpoints that have registered
 333          * by the configured endpoint servers
 334          */
 335         struct dcesrv_endpoint {
 336                 struct dcesrv_endpoint *next, *prev;
 337                 /* the type and location of the endpoint */
 338                 struct dcerpc_binding *ep_description;
 339                 /* the security descriptor for smb named pipes */
 340                 struct security_descriptor *sd;
 341                 /* the list of interfaces available on this endpoint */
 342                 struct dcesrv_if_list {
 343                         struct dcesrv_if_list *next, *prev;
 344                         struct dcesrv_interface iface;
 345                 } *interface_list;
 346         } *endpoint_list;
 347
 348         /* loadparm context to use for this connection */
 349         struct loadparm_context *lp_ctx;
 350
 351         struct idr_context *assoc_groups_idr;
 352
 353         struct dcesrv_connection *broken_connections;
 354 };
 355
 356 /* this structure is used by modules to determine the size of some critical types */
 357 struct dcesrv_critical_sizes {
 358         int interface_version;
 359         int sizeof_dcesrv_context;
 360         int sizeof_dcesrv_endpoint;
 361         int sizeof_dcesrv_endpoint_server;
 362         int sizeof_dcesrv_interface;
 363         int sizeof_dcesrv_if_list;
 364         int sizeof_dcesrv_connection;
 365         int sizeof_dcesrv_call_state;
 366         int sizeof_dcesrv_auth;
 367         int sizeof_dcesrv_handle;
 368 };
 369
 370 struct model_ops;
 371
 372 NTSTATUS dcesrv_interface_register(struct dcesrv_context *dce_ctx,
 373                                    const char *ep_name,
 374                                    const struct dcesrv_interface *iface,
 375                                    const struct security_descriptor *sd);
 376 NTSTATUS dcerpc_register_ep_server(const void *_ep_server);
 377 NTSTATUS dcesrv_init_context(TALLOC_CTX *mem_ctx,
 378                                       struct loadparm_context *lp_ctx,
 379                                       const char **endpoint_servers, struct dcesrv_context **_dce_ctx);
 380 NTSTATUS dcesrv_endpoint_connect(struct dcesrv_context *dce_ctx,
 381                                  TALLOC_CTX *mem_ctx,
 382                                  const struct dcesrv_endpoint *ep,
 383                                  struct auth_session_info *session_info,
 384                                  struct tevent_context *event_ctx,
 385                                  struct imessaging_context *msg_ctx,
 386                                  struct server_id server_id,
 387                                  uint32_t state_flags,
 388                                  struct dcesrv_connection **_p);
 389
 390 NTSTATUS dcesrv_reply(struct dcesrv_call_state *call);
 391 struct dcesrv_handle *dcesrv_handle_new(struct dcesrv_connection_context *context,
 392                                         uint8_t handle_type);
 393
 394 struct dcesrv_handle *dcesrv_handle_fetch(
 395                                           struct dcesrv_connection_context *context,
 396                                           struct policy_handle *p,
 397                                           uint8_t handle_type);
 398 struct socket_address *dcesrv_connection_get_my_addr(struct dcesrv_connection *conn, TALLOC_CTX *mem_ctx);
 399
 400 struct socket_address *dcesrv_connection_get_peer_addr(struct dcesrv_connection *conn, TALLOC_CTX *mem_ctx);
 401 const struct tsocket_address *dcesrv_connection_get_local_address(struct dcesrv_connection *conn);
 402 const struct tsocket_address *dcesrv_connection_get_remote_address(struct dcesrv_connection *conn);
 403
 404 NTSTATUS dcesrv_fetch_session_key(struct dcesrv_connection *p, DATA_BLOB *session_key);
 405
 406 /* a useful macro for generating a RPC fault in the backend code */
 407 #define DCESRV_FAULT(code) do { \
 408         dce_call->fault_code = code; \
 409         return r->out.result; \
 410 } while(0)
 411
 412 /* a useful macro for generating a RPC fault in the backend code */
 413 #define DCESRV_FAULT_VOID(code) do { \
 414         dce_call->fault_code = code; \
 415         return; \
 416 } while(0)
 417
 418 /* a useful macro for checking the validity of a dcerpc policy handle
 419    and giving the right fault code if invalid */
 420 #define DCESRV_CHECK_HANDLE(h) do {if (!(h)) DCESRV_FAULT(DCERPC_FAULT_CONTEXT_MISMATCH); } while (0)
 421
 422 /* this checks for a valid policy handle, and gives a fault if an
 423    invalid handle or retval if the handle is of the
 424    wrong type */
 425 #define DCESRV_PULL_HANDLE_RETVAL(h, inhandle, t, retval) do { \
 426         (h) = dcesrv_handle_fetch(dce_call->context, (inhandle), DCESRV_HANDLE_ANY); \
 427         DCESRV_CHECK_HANDLE(h); \
 428         if ((t) != DCESRV_HANDLE_ANY && (h)->wire_handle.handle_type != (t)) { \
 429                 return retval; \
 430         } \
 431 } while (0)
 432
 433 /* this checks for a valid policy handle and gives a dcerpc fault
 434    if its the wrong type of handle */
 435 #define DCESRV_PULL_HANDLE_FAULT(h, inhandle, t) do { \
 436         (h) = dcesrv_handle_fetch(dce_call->context, (inhandle), t); \
 437         DCESRV_CHECK_HANDLE(h); \
 438 } while (0)
 439
 440 #define DCESRV_PULL_HANDLE(h, inhandle, t) DCESRV_PULL_HANDLE_RETVAL(h, inhandle, t, NT_STATUS_INVALID_HANDLE)
 441 #define DCESRV_PULL_HANDLE_WERR(h, inhandle, t) DCESRV_PULL_HANDLE_RETVAL(h, inhandle, t, WERR_INVALID_HANDLE)
 442
 443 NTSTATUS dcesrv_add_ep(struct dcesrv_context *dce_ctx,
 444                        struct loadparm_context *lp_ctx,
 445                        struct dcesrv_endpoint *e,
 446                        struct tevent_context *event_ctx,
 447                        const struct model_ops *model_ops);
 448
 449 /**
 450  * retrieve credentials from a dce_call
 451  */
 452 _PUBLIC_ struct cli_credentials *dcesrv_call_credentials(struct dcesrv_call_state *dce_call);
 453
 454 /**
 455  * returns true if this is an authenticated call
 456  */
 457 _PUBLIC_ bool dcesrv_call_authenticated(struct dcesrv_call_state *dce_call);
 458
 459 /**
 460  * retrieve account_name for a dce_call
 461  */
 462 _PUBLIC_ const char *dcesrv_call_account_name(struct dcesrv_call_state *dce_call);
 463
 464 _PUBLIC_ NTSTATUS dcesrv_interface_bind_require_integrity(struct dcesrv_call_state *dce_call,
 465                                                           const struct dcesrv_interface *iface);
 466 _PUBLIC_ NTSTATUS dcesrv_interface_bind_require_privacy(struct dcesrv_call_state *dce_call,
 467                                                         const struct dcesrv_interface *iface);
 468 _PUBLIC_ NTSTATUS dcesrv_interface_bind_reject_connect(struct dcesrv_call_state *dce_call,
 469                                                        const struct dcesrv_interface *iface);
 470 _PUBLIC_ NTSTATUS dcesrv_interface_bind_allow_connect(struct dcesrv_call_state *dce_call,
 471                                                       const struct dcesrv_interface *iface);
 472
 473 #endif /* SAMBA_DCERPC_SERVER_H */