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/*
Unix SMB/CIFS implementation.
server side dcerpc common code
Copyright (C) Andrew Tridgell 2003-2010
Copyright (C) Stefan (metze) Metzmacher 2004-2005
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 "auth/auth.h"
#include "auth/gensec/gensec.h"
#include "../lib/util/dlinklist.h"
#include "rpc_server/dcerpc_server.h"
#include "rpc_server/dcerpc_server_proto.h"
#include "rpc_server/common/proto.h"
#include "librpc/rpc/dcerpc_proto.h"
#include "system/filesys.h"
#include "libcli/security/security.h"
#include "param/param.h"
#include "../lib/tsocket/tsocket.h"
#include "../libcli/named_pipe_auth/npa_tstream.h"
#include "smbd/service_stream.h"
#include "../lib/tsocket/tsocket.h"
#include "lib/socket/socket.h"
#include "smbd/process_model.h"
#include "lib/messaging/irpc.h"
/*
move a call from an existing linked list to the specified list. This
prevents bugs where we forget to remove the call from a previous
list when moving it.
*/
static void dcesrv_call_set_list(struct dcesrv_call_state *call,
enum dcesrv_call_list list)
{
switch (call->list) {
case DCESRV_LIST_NONE:
break;
case DCESRV_LIST_CALL_LIST:
DLIST_REMOVE(call->conn->call_list, call);
break;
case DCESRV_LIST_FRAGMENTED_CALL_LIST:
DLIST_REMOVE(call->conn->incoming_fragmented_call_list, call);
break;
case DCESRV_LIST_PENDING_CALL_LIST:
DLIST_REMOVE(call->conn->pending_call_list, call);
break;
}
call->list = list;
switch (list) {
case DCESRV_LIST_NONE:
break;
case DCESRV_LIST_CALL_LIST:
DLIST_ADD_END(call->conn->call_list, call, struct dcesrv_call_state *);
break;
case DCESRV_LIST_FRAGMENTED_CALL_LIST:
DLIST_ADD_END(call->conn->incoming_fragmented_call_list, call, struct dcesrv_call_state *);
break;
case DCESRV_LIST_PENDING_CALL_LIST:
DLIST_ADD_END(call->conn->pending_call_list, call, struct dcesrv_call_state *);
break;
}
}
void dcesrv_init_hdr(struct ncacn_packet *pkt, bool bigendian)
{
pkt->rpc_vers = 5;
pkt->rpc_vers_minor = 0;
if (bigendian) {
pkt->drep[0] = 0;
} else {
pkt->drep[0] = DCERPC_DREP_LE;
}
pkt->drep[1] = 0;
pkt->drep[2] = 0;
pkt->drep[3] = 0;
}
/*
return a dcerpc fault
*/
NTSTATUS dcesrv_fault(struct dcesrv_call_state *call, uint32_t fault_code)
{
struct ncacn_packet pkt;
struct data_blob_list_item *rep;
uint8_t zeros[4];
NTSTATUS status;
/* setup a bind_ack */
dcesrv_init_hdr(&pkt, lpcfg_rpc_big_endian(call->conn->dce_ctx->lp_ctx));
pkt.auth_length = 0;
pkt.call_id = call->pkt.call_id;
pkt.ptype = DCERPC_PKT_FAULT;
pkt.pfc_flags = DCERPC_PFC_FLAG_FIRST | DCERPC_PFC_FLAG_LAST;
pkt.u.fault.alloc_hint = 0;
pkt.u.fault.context_id = 0;
pkt.u.fault.cancel_count = 0;
pkt.u.fault.status = fault_code;
ZERO_STRUCT(zeros);
pkt.u.fault._pad = data_blob_const(zeros, sizeof(zeros));
rep = talloc(call, struct data_blob_list_item);
if (!rep) {
return NT_STATUS_NO_MEMORY;
}
status = ncacn_push_auth(&rep->blob, call, &pkt, NULL);
if (!NT_STATUS_IS_OK(status)) {
return status;
}
dcerpc_set_frag_length(&rep->blob, rep->blob.length);
DLIST_ADD_END(call->replies, rep, struct data_blob_list_item *);
dcesrv_call_set_list(call, DCESRV_LIST_CALL_LIST);
if (call->conn->call_list && call->conn->call_list->replies) {
if (call->conn->transport.report_output_data) {
call->conn->transport.report_output_data(call->conn);
}
}
return NT_STATUS_OK;
}
_PUBLIC_ NTSTATUS dcesrv_reply(struct dcesrv_call_state *call)
{
struct ndr_push *push;
NTSTATUS status;
DATA_BLOB stub;
uint32_t total_length, chunk_size;
struct dcesrv_connection_context *context = call->context;
size_t sig_size = 0;
/* call the reply function */
status = context->iface->reply(call, call, call->r);
if (!NT_STATUS_IS_OK(status)) {
return dcesrv_fault(call, call->fault_code);
}
/* form the reply NDR */
push = ndr_push_init_ctx(call);
NT_STATUS_HAVE_NO_MEMORY(push);
/* carry over the pointer count to the reply in case we are
using full pointer. See NDR specification for full
pointers */
push->ptr_count = call->ndr_pull->ptr_count;
if (lpcfg_rpc_big_endian(call->conn->dce_ctx->lp_ctx)) {
push->flags |= LIBNDR_FLAG_BIGENDIAN;
}
status = context->iface->ndr_push(call, call, push, call->r);
if (!NT_STATUS_IS_OK(status)) {
return dcesrv_fault(call, call->fault_code);
}
stub = ndr_push_blob(push);
total_length = stub.length;
/* we can write a full max_recv_frag size, minus the dcerpc
request header size */
chunk_size = call->conn->cli_max_recv_frag;
chunk_size -= DCERPC_REQUEST_LENGTH;
if (call->conn->auth_state.auth_info &&
call->conn->auth_state.gensec_security) {
sig_size = gensec_sig_size(call->conn->auth_state.gensec_security,
call->conn->cli_max_recv_frag);
if (sig_size) {
chunk_size -= DCERPC_AUTH_TRAILER_LENGTH;
chunk_size -= sig_size;
}
}
chunk_size -= (chunk_size % 16);
do {
uint32_t length;
struct data_blob_list_item *rep;
struct ncacn_packet pkt;
rep = talloc(call, struct data_blob_list_item);
NT_STATUS_HAVE_NO_MEMORY(rep);
length = MIN(chunk_size, stub.length);
/* form the dcerpc response packet */
dcesrv_init_hdr(&pkt, lpcfg_rpc_big_endian(call->conn->dce_ctx->lp_ctx));
pkt.auth_length = 0;
pkt.call_id = call->pkt.call_id;
pkt.ptype = DCERPC_PKT_RESPONSE;
pkt.pfc_flags = 0;
if (stub.length == total_length) {
pkt.pfc_flags |= DCERPC_PFC_FLAG_FIRST;
}
if (length == stub.length) {
pkt.pfc_flags |= DCERPC_PFC_FLAG_LAST;
}
pkt.u.response.alloc_hint = stub.length;
pkt.u.response.context_id = call->pkt.u.request.context_id;
pkt.u.response.cancel_count = 0;
pkt.u.response.stub_and_verifier.data = stub.data;
pkt.u.response.stub_and_verifier.length = length;
if (!dcesrv_auth_response(call, &rep->blob, sig_size, &pkt)) {
return dcesrv_fault(call, DCERPC_FAULT_OTHER);
}
dcerpc_set_frag_length(&rep->blob, rep->blob.length);
DLIST_ADD_END(call->replies, rep, struct data_blob_list_item *);
stub.data += length;
stub.length -= length;
} while (stub.length != 0);
/* move the call from the pending to the finished calls list */
dcesrv_call_set_list(call, DCESRV_LIST_CALL_LIST);
if (call->conn->call_list && call->conn->call_list->replies) {
if (call->conn->transport.report_output_data) {
call->conn->transport.report_output_data(call->conn);
}
}
return NT_STATUS_OK;
}
NTSTATUS dcesrv_generic_session_key(struct dcesrv_connection *c,
DATA_BLOB *session_key)
{
return dcerpc_generic_session_key(NULL, session_key);
}
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