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/*
* Unix SMB/CIFS implementation.
* RPC Pipe client / server routines
* Copyright (C) Andrew Tridgell 1992-1997,
* Copyright (C) Luke Kenneth Casson Leighton 1996-1997,
* Copyright (C) Jeremy Allison 2001.
*
* 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/>.
*/
#include "includes.h"
#include "system/passwd.h" /* uid_wrapper */
#include "../librpc/gen_ndr/ndr_lsa.h"
#include "../librpc/gen_ndr/ndr_samr.h"
#include "auth.h"
#include "rpc_server/rpc_pipes.h"
#include "../libcli/security/security.h"
#include "lib/tsocket/tsocket.h"
#include "librpc/ndr/ndr_table.h"
#include "librpc/rpc/dcesrv_core.h"
#undef DBGC_CLASS
#define DBGC_CLASS DBGC_RPC_SRV
static size_t num_handles = 0;
bool check_open_pipes(void)
{
if (num_handles > 0) {
return true;
}
return false;
}
size_t num_pipe_handles(void)
{
return num_handles;
}
/****************************************************************************
find first available policy slot. creates a policy handle for you.
If "data_ptr" is given, this must be a talloc'ed object, create_policy_hnd
talloc_moves this into the handle. If the policy_hnd is closed,
data_ptr is TALLOC_FREE()'ed
****************************************************************************/
struct hnd_cnt {
bool _dummy;
};
static int hnd_cnt_destructor(struct hnd_cnt *cnt)
{
num_handles--;
return 0;
}
void *create_policy_hnd(struct pipes_struct *p,
struct policy_handle *hnd,
uint8_t handle_type,
void *data_ptr)
{
struct dcesrv_handle *rpc_hnd = NULL;
struct hnd_cnt *cnt = NULL;
rpc_hnd = dcesrv_handle_create(p->dce_call, handle_type);
if (rpc_hnd == NULL) {
return NULL;
}
cnt = talloc_zero(rpc_hnd, struct hnd_cnt);
if (cnt == NULL) {
TALLOC_FREE(rpc_hnd);
return NULL;
}
talloc_set_destructor(cnt, hnd_cnt_destructor);
if (data_ptr != NULL) {
rpc_hnd->data = talloc_move(rpc_hnd, &data_ptr);
}
*hnd = rpc_hnd->wire_handle;
num_handles++;
return rpc_hnd;
}
/****************************************************************************
find policy by handle - internal version.
****************************************************************************/
static struct dcesrv_handle *find_policy_by_hnd_internal(
struct pipes_struct *p,
const struct policy_handle *hnd,
uint8_t handle_type,
void **data_p)
{
struct dcesrv_handle *h = NULL;
if (data_p) {
*data_p = NULL;
}
/*
* Do not pass an empty policy_handle to dcesrv_handle_lookup() or
* it will create a new empty handle
*/
if (ndr_policy_handle_empty(hnd)) {
p->fault_state = DCERPC_FAULT_CONTEXT_MISMATCH;
return NULL;
}
/*
* Do not pass handle_type to avoid setting the fault_state in the
* pipes_struct if the handle type does not match
*/
h = dcesrv_handle_lookup(p->dce_call, hnd, DCESRV_HANDLE_ANY);
if (h == NULL) {
p->fault_state = DCERPC_FAULT_CONTEXT_MISMATCH;
return NULL;
}
if (handle_type != DCESRV_HANDLE_ANY &&
h->wire_handle.handle_type != handle_type) {
/* Just return NULL, do not set a fault
* state in pipes_struct */
return NULL;
}
if (data_p) {
*data_p = h->data;
}
return h;
}
/****************************************************************************
find policy by handle
****************************************************************************/
void *_find_policy_by_hnd(struct pipes_struct *p,
const struct policy_handle *hnd,
uint8_t handle_type,
NTSTATUS *pstatus)
{
struct dcesrv_handle *rpc_hnd = NULL;
void *data = NULL;
rpc_hnd = find_policy_by_hnd_internal(p, hnd, handle_type, &data);
if (rpc_hnd == NULL) {
*pstatus = NT_STATUS_INVALID_HANDLE;
return NULL;
}
*pstatus = NT_STATUS_OK;
return data;
}
/****************************************************************************
Close a policy.
****************************************************************************/
bool close_policy_hnd(struct pipes_struct *p,
struct policy_handle *hnd)
{
struct dcesrv_handle *rpc_hnd = NULL;
rpc_hnd = find_policy_by_hnd_internal(p, hnd, DCESRV_HANDLE_ANY, NULL);
if (rpc_hnd == NULL) {
DEBUG(3, ("Error closing policy (policy not found)\n"));
return false;
}
TALLOC_FREE(rpc_hnd);
return true;
}
/*******************************************************************
Shall we allow access to this rpc? Currently this function
implements the 'restrict anonymous' setting by denying access to
anonymous users if the restrict anonymous level is > 0. Further work
will be checking a security descriptor to determine whether a user
token has enough access to access the pipe.
********************************************************************/
bool pipe_access_check(struct pipes_struct *p)
{
/* Don't let anonymous users access this RPC if restrict
anonymous > 0 */
if (lp_restrict_anonymous() > 0) {
struct dcesrv_call_state *dce_call = p->dce_call;
struct dcesrv_auth *auth_state = dce_call->auth_state;
enum dcerpc_AuthType auth_type = DCERPC_AUTH_TYPE_NONE;
struct auth_session_info *session_info = NULL;
enum security_user_level user_level;
if (!auth_state->auth_finished) {
return false;
}
dcesrv_call_auth_info(dce_call, &auth_type, NULL);
/* schannel, so we must be ok */
if (auth_type == DCERPC_AUTH_TYPE_SCHANNEL) {
return True;
}
session_info = dcesrv_call_session_info(dce_call);
user_level = security_session_user_level(session_info, NULL);
if (user_level < SECURITY_USER) {
return False;
}
}
return True;
}
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