1
0
mirror of https://github.com/samba-team/samba.git synced 2024-12-23 17:34:34 +03:00
samba-mirror/librpc/rpc/dcesrv_core.h
Stefan Metzmacher 09e8dd23ce dcesrv_core: introduce dcesrv_connection->transport_max_recv_frag
The max fragment size depends on the transport.

BUG: https://bugzilla.samba.org/show_bug.cgi?id=14356

Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Andreas Schneider <asn@samba.org>
2024-10-10 14:01:04 +00:00

718 lines
22 KiB
C

/*
Unix SMB/CIFS implementation.
server side dcerpc defines
Copyright (C) Andrew Tridgell 2003-2005
Copyright (C) Stefan (metze) Metzmacher 2004-2005
Copyright (C) Samuel Cabrero <scabrero@samba.org> 2019
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef _LIBRPC_RPC_DCESRV_CORE_H_
#define _LIBRPC_RPC_DCESRV_CORE_H_
#include "librpc/rpc/rpc_common.h"
#include "librpc/ndr/libndr.h"
#include "librpc/gen_ndr/security.h"
/* modules can use the following to determine if the interface has changed
* please increment the version number after each interface change
* with a comment and maybe update struct dcesrv_critical_sizes.
*/
/* version 1 - initial version - metze */
#define DCERPC_MODULE_VERSION 1
struct dcesrv_connection;
struct dcesrv_call_state;
struct dcesrv_auth;
struct dcesrv_connection_context;
struct dcesrv_iface_state;
struct cli_credentials;
struct dcesrv_interface {
const char *name;
struct ndr_syntax_id syntax_id;
/* this function is called when the client binds to this interface */
NTSTATUS (*bind)(struct dcesrv_connection_context *, const struct dcesrv_interface *);
/* this function is called when the client disconnects the endpoint */
void (*unbind)(struct dcesrv_connection_context *, const struct dcesrv_interface *);
/* the ndr_pull function for the chosen interface.
*/
NTSTATUS (*ndr_pull)(struct dcesrv_call_state *, TALLOC_CTX *, struct ndr_pull *, void **);
/* the dispatch function for the chosen interface.
*/
NTSTATUS (*dispatch)(struct dcesrv_call_state *, TALLOC_CTX *, void *);
/* the reply function for the chosen interface.
*/
NTSTATUS (*reply)(struct dcesrv_call_state *, TALLOC_CTX *, void *);
/* the ndr_push function for the chosen interface.
*/
NTSTATUS (*ndr_push)(struct dcesrv_call_state *, TALLOC_CTX *, struct ndr_push *, const void *);
/* the local dispatch function for the chosen interface.
*/
NTSTATUS (*local)(struct dcesrv_call_state *, TALLOC_CTX *, void *);
/* for any private use by the interface code */
const void *private_data;
uint64_t flags;
};
#define DCESRV_INTERFACE_FLAGS_HANDLES_NOT_USED 0x00000001
enum dcesrv_call_list {
DCESRV_LIST_NONE,
DCESRV_LIST_CALL_LIST,
DCESRV_LIST_FRAGMENTED_CALL_LIST,
DCESRV_LIST_PENDING_CALL_LIST
};
struct data_blob_list_item {
struct data_blob_list_item *prev,*next;
DATA_BLOB blob;
};
/* the state of an ongoing dcerpc call */
struct dcesrv_call_state {
struct dcesrv_call_state *next, *prev;
struct dcesrv_auth *auth_state;
struct dcesrv_connection *conn;
struct dcesrv_connection_context *context;
struct ncacn_packet pkt;
/*
* Used during async bind/alter_context.
*/
struct ncacn_packet ack_pkt;
/*
which list this request is in, if any
*/
enum dcesrv_call_list list;
/* the backend can mark the call
* with DCESRV_CALL_STATE_FLAG_ASYNC
* that will cause the frontend to not touch r->out
* and skip the reply
*
* this is only allowed to the backend when DCESRV_CALL_STATE_FLAG_MAY_ASYNC
* is already set by the frontend
*
* the backend then needs to call dcesrv_reply() when it's
* ready to send the reply
*/
#define DCESRV_CALL_STATE_FLAG_ASYNC (1<<0)
#define DCESRV_CALL_STATE_FLAG_MAY_ASYNC (1<<1)
#define DCESRV_CALL_STATE_FLAG_MULTIPLEXED (1<<3)
#define DCESRV_CALL_STATE_FLAG_PROCESS_PENDING_CALL (1<<4)
#define DCESRV_CALL_STATE_FLAG_WINBIND_OFF (1 << 5)
uint32_t state_flags;
/* the time the request arrived in the server */
struct timeval time;
/* the backend can use this event context for async replies */
struct tevent_context *event_ctx;
/* this is the pointer to the allocated function struct */
void *r;
/*
* that's the ndr pull context used in dcesrv_request()
* needed by dcesrv_reply() to carry over information
* for full pointer support.
*/
struct ndr_pull *ndr_pull;
DATA_BLOB input;
struct data_blob_list_item *replies;
/* this is used by the boilerplate code to generate DCERPC faults */
uint32_t fault_code;
/* the reason why we terminate the connection after sending a response */
const char *terminate_reason;
/* temporary auth_info fields */
struct dcerpc_auth in_auth_info;
struct dcerpc_auth _out_auth_info;
struct dcerpc_auth *out_auth_info;
/*
* Optional subreq for pending calls,
* will be used to call tevent_req_cancel()
* if the connection terminates,
* we got an ORPHANED PDU
* or got a CO_CANCEL PDU
*/
bool got_disconnect;
bool got_orphaned;
bool got_co_cancel;
struct tevent_req *subreq;
};
/*
* DCERPC Handles
* --------------
* The various handles that are used in the RPC servers should be
* created and fetch using the dcesrv_handle_* functions.
*
* Use
* dcesrv_handle_create(struct dcesrv_call_state \*, uint8 handle_type)
* to obtain a new handle of the specified type. Handle types are
* unique within each pipe.
*
* The handle can later be fetched again using:
*
* struct dcesrv_handle *dcesrv_handle_lookup(
* struct dcesrv_call_state *dce_call,
* struct policy_handle *p,
* uint8 handle_type)
*
* and destroyed by:
*
* TALLOC_FREE(struct dcesrv_handle *).
*
* User data should be stored in the 'data' member of the dcesrv_handle
* struct.
*/
#define DCESRV_HANDLE_ANY 255
/* a dcerpc handle in internal format */
struct dcesrv_handle {
struct dcesrv_handle *next, *prev;
struct dcesrv_assoc_group *assoc_group;
struct policy_handle wire_handle;
struct dom_sid sid;
enum dcerpc_AuthLevel min_auth_level;
const struct dcesrv_interface *iface;
void *data;
};
/* hold the authentication state information */
struct dcesrv_auth {
struct dcesrv_auth *prev, *next;
enum dcerpc_AuthType auth_type;
enum dcerpc_AuthLevel auth_level;
uint32_t auth_context_id;
struct gensec_security *gensec_security;
struct auth_session_info *session_info;
NTSTATUS (*session_key_fn)(struct dcesrv_auth *, DATA_BLOB *session_key);
bool auth_started;
bool auth_finished;
bool auth_audited;
bool auth_invalid;
};
struct dcesrv_connection_context {
struct dcesrv_connection_context *next, *prev;
uint16_t context_id;
/* the connection this is on */
struct dcesrv_connection *conn;
/* the ndr function table for the chosen interface */
const struct dcesrv_interface *iface;
/*
* the minimum required auth level for this interface
*/
enum dcerpc_AuthLevel min_auth_level;
bool allow_connect;
/* the negotiated transfer syntax */
struct ndr_syntax_id transfer_syntax;
bool ndr64;
};
/* the state associated with a dcerpc server connection */
struct dcesrv_connection {
/* for the broken_connections DLIST */
struct dcesrv_connection *prev, *next;
/* the top level context for this server */
struct dcesrv_context *dce_ctx;
/* the endpoint that was opened */
const struct dcesrv_endpoint *endpoint;
/* a list of established context_ids */
struct dcesrv_connection_context *contexts;
/* the state of the current incoming call fragments */
struct dcesrv_call_state *incoming_fragmented_call_list;
/* the state of the async pending calls */
struct dcesrv_call_state *pending_call_list;
/* the state of the current outgoing calls */
struct dcesrv_call_state *call_list;
/* the maximum size the client wants to receive */
uint16_t transport_max_recv_frag;
uint16_t max_recv_frag;
uint16_t max_xmit_frag;
DATA_BLOB partial_input;
/* the event_context that will be used for this connection */
struct tevent_context *event_ctx;
/* is this connection pending termination? If so, why? */
const char *terminate;
const char *packet_log_dir;
/* this is the default state_flags for dcesrv_call_state structs */
uint32_t state_flags;
struct {
void *private_data;
void (*report_output_data)(struct dcesrv_connection *);
void (*terminate_connection)(struct dcesrv_connection *,
const char *);
} transport;
struct tstream_context *stream;
struct tevent_queue *send_queue;
const struct tsocket_address *local_address;
const struct tsocket_address *remote_address;
/* the current authentication state */
struct dcesrv_auth *default_auth_state;
size_t max_auth_states;
struct dcesrv_auth *auth_states;
bool got_explicit_auth_level_non_connect;
bool got_explicit_auth_level_connect;
struct dcesrv_auth *default_auth_level_connect;
bool client_hdr_signing;
bool support_hdr_signing;
bool negotiated_hdr_signing;
/*
* remember which pdu types are allowed
*/
bool allow_bind;
bool allow_alter;
/* the association group the connection belongs to */
struct dcesrv_assoc_group *assoc_group;
/* The maximum total payload of reassembled request pdus */
size_t max_total_request_size;
/*
* Our preferred transfer syntax.
*/
const struct ndr_syntax_id *preferred_transfer;
/*
* This is used to block the connection during
* pending authentication.
*/
struct tevent_req *(*wait_send)(TALLOC_CTX *mem_ctx,
struct tevent_context *ev,
void *private_data);
NTSTATUS (*wait_recv)(struct tevent_req *req);
void *wait_private;
};
struct dcesrv_endpoint_server {
/* this is the name of the endpoint server */
const char *name;
/* true if the endpoint server has been initialized */
bool initialized;
/* this function should register endpoints and some other setup stuff,
* it is called when the dcesrv_context gets initialized.
*/
NTSTATUS (*init_server)(struct dcesrv_context *, const struct dcesrv_endpoint_server *);
/* this function should cleanup endpoint server state and unregister
* the endpoint server from dcesrv_context */
NTSTATUS (*shutdown_server)(struct dcesrv_context *, const struct dcesrv_endpoint_server *);
/* this function can be used by other endpoint servers to
* ask for a dcesrv_interface implementation
* - iface must be reference to an already existing struct !
*/
bool (*interface_by_uuid)(struct dcesrv_interface *iface, const struct GUID *, uint32_t);
/* this function can be used by other endpoint servers to
* ask for a dcesrv_interface implementation
* - iface must be reference to an already existing struct !
*/
bool (*interface_by_name)(struct dcesrv_interface *iface, const char *);
};
/* one association groups */
struct dcesrv_assoc_group {
/* the wire id */
uint32_t id;
/* The transport this is valid on */
enum dcerpc_transport_t transport;
/* list of handles in this association group */
struct dcesrv_handle *handles;
/*
* list of iface states per assoc/conn
*/
struct dcesrv_iface_state *iface_states;
/* parent context */
struct dcesrv_context *dce_ctx;
/* the negotiated bind time features */
uint16_t bind_time_features;
};
struct dcesrv_context_callbacks {
struct {
void (*successful_authz)(
struct dcesrv_call_state *call, void *private_data);
void *private_data;
} log;
struct {
NTSTATUS (*gensec_prepare)(
TALLOC_CTX *mem_ctx,
struct dcesrv_call_state *call,
struct gensec_security **out,
void *private_data);
void *private_data;
void (*become_root)(void);
void (*unbecome_root)(void);
} auth;
struct {
NTSTATUS (*find)(
struct dcesrv_call_state *call, void *private_data);
void *private_data;
} assoc_group;
};
/* server-wide context information for the dcerpc server */
struct dcesrv_context {
/*
* The euid at startup time.
*
* This is required for DCERPC_AUTH_TYPE_NCALRPC_AS_SYSTEM
*/
uid_t initial_euid;
/* the list of endpoints that have registered
* by the configured endpoint servers
*/
struct dcesrv_endpoint {
struct dcesrv_endpoint *next, *prev;
/* the type and location of the endpoint */
struct dcerpc_binding *ep_description;
/* the secondary endpoint description for the BIND_ACK */
struct dcerpc_binding *ep_2nd_description;
/* the security descriptor for smb named pipes */
struct security_descriptor *sd;
/* the list of interfaces available on this endpoint */
struct dcesrv_if_list {
struct dcesrv_if_list *next, *prev;
struct dcesrv_interface *iface;
} *interface_list;
/*
* Should this service be run in a single process (so far only
* NETLOGON is not run in a single process)
*/
bool use_single_process;
} *endpoint_list;
/*
* registered auth_type/principals
* for dcesrv_mgmt_inq_princ_name()
*/
struct dcesrv_ctx_principal {
struct dcesrv_ctx_principal *next, *prev;
enum dcerpc_AuthType auth_type;
const char *principal_name;
} *principal_list;
/* loadparm context to use for this connection */
struct loadparm_context *lp_ctx;
struct idr_context *assoc_groups_idr;
uint32_t assoc_groups_num;
struct dcesrv_connection *broken_connections;
/*
* Our preferred transfer syntax.
*/
const struct ndr_syntax_id *preferred_transfer;
struct dcesrv_context_callbacks *callbacks;
};
/* this structure is used by modules to determine the size of some critical types */
struct dcesrv_critical_sizes {
int interface_version;
int sizeof_dcesrv_context;
int sizeof_dcesrv_endpoint;
int sizeof_dcesrv_endpoint_server;
int sizeof_dcesrv_interface;
int sizeof_dcesrv_if_list;
int sizeof_dcesrv_connection;
int sizeof_dcesrv_call_state;
int sizeof_dcesrv_auth;
int sizeof_dcesrv_handle;
};
NTSTATUS dcesrv_auth_type_principal_register(struct dcesrv_context *dce_ctx,
enum dcerpc_AuthType auth_type,
const char *principal_name);
const char *dcesrv_auth_type_principal_find(struct dcesrv_context *dce_ctx,
enum dcerpc_AuthType auth_type);
NTSTATUS dcesrv_register_default_auth_types(struct dcesrv_context *dce_ctx,
const char *principal);
NTSTATUS dcesrv_register_default_auth_types_machine_principal(struct dcesrv_context *dce_ctx);
NTSTATUS dcesrv_interface_register(struct dcesrv_context *dce_ctx,
const char *ep_name,
const char *ncacn_np_secondary_endpoint,
const struct dcesrv_interface *iface,
const struct security_descriptor *sd);
NTSTATUS dcesrv_interface_register_b(struct dcesrv_context *dce_ctx,
struct dcerpc_binding *binding,
struct dcerpc_binding *binding2,
const struct dcesrv_interface *iface,
const struct security_descriptor *sd);
NTSTATUS dcerpc_register_ep_server(const struct dcesrv_endpoint_server *ep_server);
NTSTATUS dcesrv_init_ep_servers(struct dcesrv_context *dce_ctx,
const char **ep_servers);
NTSTATUS dcesrv_init_registered_ep_servers(struct dcesrv_context *dce_ctx);
NTSTATUS dcesrv_shutdown_registered_ep_servers(struct dcesrv_context *dce_ctx);
NTSTATUS dcesrv_init_ep_server(struct dcesrv_context *dce_ctx,
const char *ep_server_name);
NTSTATUS dcesrv_shutdown_ep_server(struct dcesrv_context *dce_ctx,
const char *name);
const struct dcesrv_endpoint_server *dcesrv_ep_server_byname(const char *name);
NTSTATUS dcesrv_init_context(TALLOC_CTX *mem_ctx,
struct loadparm_context *lp_ctx,
struct dcesrv_context_callbacks *cb,
struct dcesrv_context **_dce_ctx);
void dcesrv_context_set_callbacks(
struct dcesrv_context *dce_ctx,
struct dcesrv_context_callbacks *cb);
/*
* Use dcesrv_async_reply() in async code
*/
NTSTATUS dcesrv_reply(struct dcesrv_call_state *call);
void _dcesrv_async_reply(struct dcesrv_call_state *call,
const char *func,
const char *location);
#define dcesrv_async_reply(__call) \
_dcesrv_async_reply(__call, __func__, __location__)
struct dcesrv_handle *dcesrv_handle_create(struct dcesrv_call_state *call,
uint8_t handle_type);
struct dcesrv_handle *dcesrv_handle_lookup(struct dcesrv_call_state *call,
const struct policy_handle *p,
uint8_t handle_type);
const struct tsocket_address *dcesrv_connection_get_local_address(struct dcesrv_connection *conn);
const struct tsocket_address *dcesrv_connection_get_remote_address(struct dcesrv_connection *conn);
/*
* Fetch the authentication session key if available.
*
* This is the key generated by a gensec authentication.
*/
NTSTATUS dcesrv_auth_session_key(struct dcesrv_call_state *call,
DATA_BLOB *session_key);
/*
* Fetch the transport session key if available.
* Typically this is the SMB session key
* or a fixed key for local transports.
*
* The key is always truncated to 16 bytes.
*/
NTSTATUS dcesrv_transport_session_key(struct dcesrv_call_state *call,
DATA_BLOB *session_key);
/* a useful macro for generating a RPC fault in the backend code */
#define DCESRV_FAULT(code) do { \
dce_call->fault_code = code; \
return r->out.result; \
} while(0)
/* a useful macro for generating a RPC fault in the backend code */
#define DCESRV_FAULT_VOID(code) do { \
dce_call->fault_code = code; \
return; \
} while(0)
/* a useful macro for checking the validity of a dcerpc policy handle
and giving the right fault code if invalid */
#define DCESRV_CHECK_HANDLE(h) do {if (!(h)) DCESRV_FAULT(DCERPC_FAULT_CONTEXT_MISMATCH); } while (0)
/* this checks for a valid policy handle, and gives a fault if an
invalid handle or retval if the handle is of the
wrong type */
#define DCESRV_PULL_HANDLE_RETVAL(h, inhandle, t, retval) do { \
(h) = dcesrv_handle_lookup(dce_call, (inhandle), DCESRV_HANDLE_ANY); \
DCESRV_CHECK_HANDLE(h); \
if ((t) != DCESRV_HANDLE_ANY && (h)->wire_handle.handle_type != (t)) { \
return retval; \
} \
} while (0)
/* this checks for a valid policy handle and gives a dcerpc fault
if its the wrong type of handle */
#define DCESRV_PULL_HANDLE_FAULT(h, inhandle, t) do { \
(h) = dcesrv_handle_lookup(dce_call, (inhandle), t); \
DCESRV_CHECK_HANDLE(h); \
} while (0)
#define DCESRV_PULL_HANDLE(h, inhandle, t) DCESRV_PULL_HANDLE_RETVAL(h, inhandle, t, NT_STATUS_INVALID_HANDLE)
#define DCESRV_PULL_HANDLE_WERR(h, inhandle, t) DCESRV_PULL_HANDLE_RETVAL(h, inhandle, t, WERR_INVALID_HANDLE)
/**
* retrieve credentials from a dce_call
*/
_PUBLIC_ struct cli_credentials *dcesrv_call_credentials(struct dcesrv_call_state *dce_call);
/**
* returns true if this is an authenticated call
*/
_PUBLIC_ bool dcesrv_call_authenticated(struct dcesrv_call_state *dce_call);
/**
* retrieve account_name for a dce_call
*/
_PUBLIC_ const char *dcesrv_call_account_name(struct dcesrv_call_state *dce_call);
/**
* retrieve session_info from a dce_call
*/
_PUBLIC_ struct auth_session_info *dcesrv_call_session_info(struct dcesrv_call_state *dce_call);
/**
* retrieve auth type/level from a dce_call
*/
_PUBLIC_ void dcesrv_call_auth_info(struct dcesrv_call_state *dce_call,
enum dcerpc_AuthType *auth_type,
enum dcerpc_AuthLevel *auth_level);
_PUBLIC_ NTSTATUS dcesrv_interface_bind_require_integrity(struct dcesrv_connection_context *context,
const struct dcesrv_interface *iface);
_PUBLIC_ NTSTATUS dcesrv_interface_bind_require_privacy(struct dcesrv_connection_context *context,
const struct dcesrv_interface *iface);
_PUBLIC_ NTSTATUS dcesrv_interface_bind_reject_connect(struct dcesrv_connection_context *context,
const struct dcesrv_interface *iface);
_PUBLIC_ NTSTATUS dcesrv_interface_bind_allow_connect(struct dcesrv_connection_context *context,
const struct dcesrv_interface *iface);
_PUBLIC_ NTSTATUS _dcesrv_iface_state_store_assoc(
struct dcesrv_call_state *call,
uint64_t magic,
void *ptr,
const char *location);
#define dcesrv_iface_state_store_assoc(call, magic, ptr) \
_dcesrv_iface_state_store_assoc((call), (magic), (ptr), \
__location__)
_PUBLIC_ void *_dcesrv_iface_state_find_assoc(
struct dcesrv_call_state *call,
uint64_t magic);
#define dcesrv_iface_state_find_assoc(call, magic, _type) \
talloc_get_type( \
_dcesrv_iface_state_find_assoc((call), (magic)), \
_type)
_PUBLIC_ NTSTATUS _dcesrv_iface_state_store_conn(
struct dcesrv_call_state *call,
uint64_t magic,
void *_pptr,
const char *location);
#define dcesrv_iface_state_store_conn(call, magic, ptr) \
_dcesrv_iface_state_store_conn((call), (magic), (ptr), \
__location__)
_PUBLIC_ void *_dcesrv_iface_state_find_conn(
struct dcesrv_call_state *call,
uint64_t magic);
#define dcesrv_iface_state_find_conn(call, magic, _type) \
talloc_get_type( \
_dcesrv_iface_state_find_conn((call), (magic)), \
_type)
_PUBLIC_ void dcesrv_cleanup_broken_connections(struct dcesrv_context *dce_ctx);
_PUBLIC_ NTSTATUS dcesrv_endpoint_connect(struct dcesrv_context *dce_ctx,
TALLOC_CTX *mem_ctx,
const struct dcesrv_endpoint *ep,
struct auth_session_info *session_info,
struct tevent_context *event_ctx,
uint32_t state_flags,
struct dcesrv_connection **_p);
_PUBLIC_ NTSTATUS dcesrv_find_endpoint(struct dcesrv_context *dce_ctx,
const struct dcerpc_binding *ep_description,
struct dcesrv_endpoint **_out);
_PUBLIC_ void dcesrv_terminate_connection(struct dcesrv_connection *dce_conn,
const char *reason);
_PUBLIC_ void dcesrv_sock_report_output_data(struct dcesrv_connection *dce_conn);
_PUBLIC_ NTSTATUS dcesrv_connection_loop_start(struct dcesrv_connection *conn);
_PUBLIC_ void dcesrv_loop_next_packet(
struct dcesrv_connection *dce_conn,
struct ncacn_packet *pkt,
DATA_BLOB buffer);
_PUBLIC_ NTSTATUS dcesrv_call_dispatch_local(struct dcesrv_call_state *call);
_PUBLIC_ const struct dcesrv_interface *find_interface_by_syntax_id(
const struct dcesrv_endpoint *endpoint,
const struct ndr_syntax_id *interface);
void _dcesrv_save_ndr_fuzz_seed(DATA_BLOB call_blob,
struct dcesrv_call_state *call,
ndr_flags_type flags);
#if DEVELOPER
#define dcesrv_save_ndr_fuzz_seed(stub, call, flags) \
_dcesrv_save_ndr_fuzz_seed(stub, call, flags)
#else
#define dcesrv_save_ndr_fuzz_seed(stub, call, flags) \
/* */
#endif
#endif /* _LIBRPC_RPC_DCESRV_CORE_H_ */