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 /* the state of an ongoing dcerpc call */
  80 struct dcesrv_call_state {
  81         struct dcesrv_call_state *next, *prev;
  82         struct dcesrv_connection *conn;
  83         struct dcesrv_connection_context *context;
  84         struct ncacn_packet pkt;
  85
  86         /*
  87           which list this request is in, if any
  88          */
  89         enum dcesrv_call_list list;
  90
  91         /* the backend can mark the call
  92          * with DCESRV_CALL_STATE_FLAG_ASYNC
  93          * that will cause the frontend to not touch r->out
  94          * and skip the reply
  95          *
  96          * this is only allowed to the backend when DCESRV_CALL_STATE_FLAG_MAY_ASYNC
  97          * is alerady set by the frontend
  98          *
  99          * the backend then needs to call dcesrv_reply() when it's
 100          * ready to send the reply
 101          */
 102 #define DCESRV_CALL_STATE_FLAG_ASYNC (1<<0)
 103 #define DCESRV_CALL_STATE_FLAG_MAY_ASYNC (1<<1)
 104 #define DCESRV_CALL_STATE_FLAG_MULTIPLEXED (1<<3)
 105         uint32_t state_flags;
 106
 107         /* the time the request arrived in the server */
 108         struct timeval time;
 109
 110         /* the backend can use this event context for async replies */
 111         struct tevent_context *event_ctx;
 112
 113         /* the message_context that will be used for async replies */
 114         struct imessaging_context *msg_ctx;
 115
 116         /* this is the pointer to the allocated function struct */
 117         void *r;
 118
 119         /*
 120          * that's the ndr pull context used in dcesrv_request()
 121          * needed by dcesrv_reply() to carry over information
 122          * for full pointer support.
 123          */
 124         struct ndr_pull *ndr_pull;
 125
 126         DATA_BLOB input;
 127
 128         struct data_blob_list_item *replies;
 129
 130         /* this is used by the boilerplate code to generate DCERPC faults */
 131         uint32_t fault_code;
 132 };
 133
 134 #define DCESRV_HANDLE_ANY 255
 135
 136 /* a dcerpc handle in internal format */
 137 struct dcesrv_handle {
 138         struct dcesrv_handle *next, *prev;
 139         struct dcesrv_assoc_group *assoc_group;
 140         struct policy_handle wire_handle;
 141         struct dom_sid *sid;
 142         const struct dcesrv_interface *iface;
 143         void *data;
 144 };
 145
 146 /* hold the authentication state information */
 147 struct dcesrv_auth {
 148         struct dcerpc_auth *auth_info;
 149         struct gensec_security *gensec_security;
 150         struct auth_session_info *session_info;
 151         NTSTATUS (*session_key)(struct dcesrv_connection *, DATA_BLOB *session_key);
 152         bool client_hdr_signing;
 153         bool hdr_signing;
 154 };
 155
 156 struct dcesrv_connection_context {
 157         struct dcesrv_connection_context *next, *prev;
 158         uint32_t context_id;
 159
 160         struct dcesrv_assoc_group *assoc_group;
 161
 162         /* the connection this is on */
 163         struct dcesrv_connection *conn;
 164
 165         /* the ndr function table for the chosen interface */
 166         const struct dcesrv_interface *iface;
 167
 168         /* private data for the interface implementation */
 169         void *private_data;
 170 };
 171
 172
 173 /* the state associated with a dcerpc server connection */
 174 struct dcesrv_connection {
 175         /* for the broken_connections DLIST */
 176         struct dcesrv_connection *prev, *next;
 177
 178         /* the top level context for this server */
 179         struct dcesrv_context *dce_ctx;
 180
 181         /* the endpoint that was opened */
 182         const struct dcesrv_endpoint *endpoint;
 183
 184         /* a list of established context_ids */
 185         struct dcesrv_connection_context *contexts;
 186
 187         /* the state of the current incoming call fragments */
 188         struct dcesrv_call_state *incoming_fragmented_call_list;
 189
 190         /* the state of the async pending calls */
 191         struct dcesrv_call_state *pending_call_list;
 192
 193         /* the state of the current outgoing calls */
 194         struct dcesrv_call_state *call_list;
 195
 196         /* the maximum size the client wants to receive */
 197         uint32_t cli_max_recv_frag;
 198
 199         DATA_BLOB partial_input;
 200
 201         /* the current authentication state */
 202         struct dcesrv_auth auth_state;
 203
 204         /* the event_context that will be used for this connection */
 205         struct tevent_context *event_ctx;
 206
 207         /* the message_context that will be used for this connection */
 208         struct imessaging_context *msg_ctx;
 209
 210         /* the server_id that will be used for this connection */
 211         struct server_id server_id;
 212
 213         /* the transport level session key */
 214         DATA_BLOB transport_session_key;
 215
 216         /* is this connection pending termination?  If so, why? */
 217         const char *terminate;
 218
 219         const char *packet_log_dir;
 220
 221         /* this is the default state_flags for dcesrv_call_state structs */
 222         uint32_t state_flags;
 223
 224         struct {
 225                 void *private_data;
 226                 void (*report_output_data)(struct dcesrv_connection *);
 227         } transport;
 228
 229         struct tstream_context *stream;
 230         struct tevent_queue *send_queue;
 231
 232         const struct tsocket_address *local_address;
 233         const struct tsocket_address *remote_address;
 234 };
 235
 236
 237 struct dcesrv_endpoint_server {
 238         /* this is the name of the endpoint server */
 239         const char *name;
 240
 241         /* this function should register endpoints and some other setup stuff,
 242          * it is called when the dcesrv_context gets initialized.
 243          */
 244         NTSTATUS (*init_server)(struct dcesrv_context *, const struct dcesrv_endpoint_server *);
 245
 246         /* this function can be used by other endpoint servers to
 247          * ask for a dcesrv_interface implementation
 248          * - iface must be reference to an already existing struct !
 249          */
 250         bool (*interface_by_uuid)(struct dcesrv_interface *iface, const struct GUID *, uint32_t);
 251
 252         /* this function can be used by other endpoint servers to
 253          * ask for a dcesrv_interface implementation
 254          * - iface must be reference to an already existeng struct !
 255          */
 256         bool (*interface_by_name)(struct dcesrv_interface *iface, const char *);
 257 };
 258
 259
 260 /* one association groups */
 261 struct dcesrv_assoc_group {
 262         /* the wire id */
 263         uint32_t id;
 264
 265         /* list of handles in this association group */
 266         struct dcesrv_handle *handles;
 267
 268         /* parent context */
 269         struct dcesrv_context *dce_ctx;
 270
 271         /* Remote association group ID (if proxied) */
 272         uint32_t proxied_id;
 273 };
 274
 275 /* server-wide context information for the dcerpc server */
 276 struct dcesrv_context {
 277         /*
 278          * The euid at startup time.
 279          *
 280          * This is required for DCERPC_AUTH_TYPE_NCALRPC_AS_SYSTEM
 281          */
 282         uid_t initial_euid;
 283
 284         /* the list of endpoints that have registered
 285          * by the configured endpoint servers
 286          */
 287         struct dcesrv_endpoint {
 288                 struct dcesrv_endpoint *next, *prev;
 289                 /* the type and location of the endpoint */
 290                 struct dcerpc_binding *ep_description;
 291                 /* the security descriptor for smb named pipes */
 292                 struct security_descriptor *sd;
 293                 /* the list of interfaces available on this endpoint */
 294                 struct dcesrv_if_list {
 295                         struct dcesrv_if_list *next, *prev;
 296                         struct dcesrv_interface iface;
 297                 } *interface_list;
 298         } *endpoint_list;
 299
 300         /* loadparm context to use for this connection */
 301         struct loadparm_context *lp_ctx;
 302
 303         struct idr_context *assoc_groups_idr;
 304
 305         struct dcesrv_connection *broken_connections;
 306 };
 307
 308 /* this structure is used by modules to determine the size of some critical types */
 309 struct dcesrv_critical_sizes {
 310         int interface_version;
 311         int sizeof_dcesrv_context;
 312         int sizeof_dcesrv_endpoint;
 313         int sizeof_dcesrv_endpoint_server;
 314         int sizeof_dcesrv_interface;
 315         int sizeof_dcesrv_if_list;
 316         int sizeof_dcesrv_connection;
 317         int sizeof_dcesrv_call_state;
 318         int sizeof_dcesrv_auth;
 319         int sizeof_dcesrv_handle;
 320 };
 321
 322 struct model_ops;
 323
 324 NTSTATUS dcesrv_interface_register(struct dcesrv_context *dce_ctx,
 325                                    const char *ep_name,
 326                                    const struct dcesrv_interface *iface,
 327                                    const struct security_descriptor *sd);
 328 NTSTATUS dcerpc_register_ep_server(const void *_ep_server);
 329 NTSTATUS dcesrv_init_context(TALLOC_CTX *mem_ctx,
 330                                       struct loadparm_context *lp_ctx,
 331                                       const char **endpoint_servers, struct dcesrv_context **_dce_ctx);
 332 NTSTATUS dcesrv_endpoint_connect(struct dcesrv_context *dce_ctx,
 333                                  TALLOC_CTX *mem_ctx,
 334                                  const struct dcesrv_endpoint *ep,
 335                                  struct auth_session_info *session_info,
 336                                  struct tevent_context *event_ctx,
 337                                  struct imessaging_context *msg_ctx,
 338                                  struct server_id server_id,
 339                                  uint32_t state_flags,
 340                                  struct dcesrv_connection **_p);
 341
 342 NTSTATUS dcesrv_reply(struct dcesrv_call_state *call);
 343 struct dcesrv_handle *dcesrv_handle_new(struct dcesrv_connection_context *context,
 344                                         uint8_t handle_type);
 345
 346 struct dcesrv_handle *dcesrv_handle_fetch(
 347                                           struct dcesrv_connection_context *context,
 348                                           struct policy_handle *p,
 349                                           uint8_t handle_type);
 350 struct socket_address *dcesrv_connection_get_my_addr(struct dcesrv_connection *conn, TALLOC_CTX *mem_ctx);
 351
 352 struct socket_address *dcesrv_connection_get_peer_addr(struct dcesrv_connection *conn, TALLOC_CTX *mem_ctx);
 353 const struct tsocket_address *dcesrv_connection_get_local_address(struct dcesrv_connection *conn);
 354 const struct tsocket_address *dcesrv_connection_get_remote_address(struct dcesrv_connection *conn);
 355
 356 NTSTATUS dcesrv_fetch_session_key(struct dcesrv_connection *p, DATA_BLOB *session_key);
 357
 358 /* a useful macro for generating a RPC fault in the backend code */
 359 #define DCESRV_FAULT(code) do { \
 360         dce_call->fault_code = code; \
 361         return r->out.result; \
 362 } while(0)
 363
 364 /* a useful macro for generating a RPC fault in the backend code */
 365 #define DCESRV_FAULT_VOID(code) do { \
 366         dce_call->fault_code = code; \
 367         return; \
 368 } while(0)
 369
 370 /* a useful macro for checking the validity of a dcerpc policy handle
 371    and giving the right fault code if invalid */
 372 #define DCESRV_CHECK_HANDLE(h) do {if (!(h)) DCESRV_FAULT(DCERPC_FAULT_CONTEXT_MISMATCH); } while (0)
 373
 374 /* this checks for a valid policy handle, and gives a fault if an
 375    invalid handle or retval if the handle is of the
 376    wrong type */
 377 #define DCESRV_PULL_HANDLE_RETVAL(h, inhandle, t, retval) do { \
 378         (h) = dcesrv_handle_fetch(dce_call->context, (inhandle), DCESRV_HANDLE_ANY); \
 379         DCESRV_CHECK_HANDLE(h); \
 380         if ((t) != DCESRV_HANDLE_ANY && (h)->wire_handle.handle_type != (t)) { \
 381                 return retval; \
 382         } \
 383 } while (0)
 384
 385 /* this checks for a valid policy handle and gives a dcerpc fault
 386    if its the wrong type of handle */
 387 #define DCESRV_PULL_HANDLE_FAULT(h, inhandle, t) do { \
 388         (h) = dcesrv_handle_fetch(dce_call->context, (inhandle), t); \
 389         DCESRV_CHECK_HANDLE(h); \
 390 } while (0)
 391
 392 #define DCESRV_PULL_HANDLE(h, inhandle, t) DCESRV_PULL_HANDLE_RETVAL(h, inhandle, t, NT_STATUS_INVALID_HANDLE)
 393 #define DCESRV_PULL_HANDLE_WERR(h, inhandle, t) DCESRV_PULL_HANDLE_RETVAL(h, inhandle, t, WERR_BADFID)
 394
 395 NTSTATUS dcesrv_add_ep(struct dcesrv_context *dce_ctx,
 396                        struct loadparm_context *lp_ctx,
 397                        struct dcesrv_endpoint *e,
 398                        struct tevent_context *event_ctx,
 399                        const struct model_ops *model_ops);
 400
 401 /**
 402  * retrieve credentials from a dce_call
 403  */
 404 _PUBLIC_ struct cli_credentials *dcesrv_call_credentials(struct dcesrv_call_state *dce_call);
 405
 406 /**
 407  * returns true if this is an authenticated call
 408  */
 409 _PUBLIC_ bool dcesrv_call_authenticated(struct dcesrv_call_state *dce_call);
 410
 411 /**
 412  * retrieve account_name for a dce_call
 413  */
 414 _PUBLIC_ const char *dcesrv_call_account_name(struct dcesrv_call_state *dce_call);
 415
 416
 417 #endif /* SAMBA_DCERPC_SERVER_H */