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|
/*
Unix SMB/CIFS implementation.
smbd-specific dcerpc server code
Copyright (C) Andrew Tridgell 2003-2005
Copyright (C) Stefan (metze) Metzmacher 2004-2005
Copyright (C) Jelmer Vernooij <jelmer@samba.org> 2004,2007
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 "librpc/gen_ndr/ndr_dcerpc.h"
#include "auth/auth.h"
#include "../lib/util/dlinklist.h"
#include "rpc_server/dcerpc_server.h"
#include "rpc_server/dcerpc_server_proto.h"
#include "system/filesys.h"
#include "lib/messaging/irpc.h"
#include "system/network.h"
#include "lib/socket/netif.h"
#include "param/param.h"
#include "../lib/tsocket/tsocket.h"
#include "librpc/rpc/dcerpc_proto.h"
#include "../lib/util/tevent_ntstatus.h"
#include "libcli/raw/smb.h"
#include "../libcli/named_pipe_auth/npa_tstream.h"
#include "smbd/process_model.h"
struct dcesrv_socket_context {
const struct dcesrv_endpoint *endpoint;
struct dcesrv_context *dcesrv_ctx;
};
static void dcesrv_terminate_connection(struct dcesrv_connection *dce_conn, const char *reason)
{
struct stream_connection *srv_conn;
srv_conn = talloc_get_type(dce_conn->transport.private_data,
struct stream_connection);
stream_terminate_connection(srv_conn, reason);
}
static void dcesrv_sock_reply_done(struct tevent_req *subreq);
struct dcesrv_sock_reply_state {
struct dcesrv_connection *dce_conn;
struct dcesrv_call_state *call;
struct iovec iov;
};
static void dcesrv_sock_report_output_data(struct dcesrv_connection *dce_conn)
{
struct dcesrv_call_state *call;
call = dce_conn->call_list;
if (!call || !call->replies) {
return;
}
while (call->replies) {
struct data_blob_list_item *rep = call->replies;
struct dcesrv_sock_reply_state *substate;
struct tevent_req *subreq;
substate = talloc(call, struct dcesrv_sock_reply_state);
if (!substate) {
dcesrv_terminate_connection(dce_conn, "no memory");
return;
}
substate->dce_conn = dce_conn;
substate->call = NULL;
DLIST_REMOVE(call->replies, rep);
if (call->replies == NULL) {
substate->call = call;
}
substate->iov.iov_base = rep->blob.data;
substate->iov.iov_len = rep->blob.length;
subreq = tstream_writev_queue_send(substate,
dce_conn->event_ctx,
dce_conn->stream,
dce_conn->send_queue,
&substate->iov, 1);
if (!subreq) {
dcesrv_terminate_connection(dce_conn, "no memory");
return;
}
tevent_req_set_callback(subreq, dcesrv_sock_reply_done,
substate);
}
DLIST_REMOVE(call->conn->call_list, call);
call->list = DCESRV_LIST_NONE;
}
static void dcesrv_sock_reply_done(struct tevent_req *subreq)
{
struct dcesrv_sock_reply_state *substate = tevent_req_callback_data(subreq,
struct dcesrv_sock_reply_state);
int ret;
int sys_errno;
NTSTATUS status;
struct dcesrv_call_state *call = substate->call;
ret = tstream_writev_queue_recv(subreq, &sys_errno);
TALLOC_FREE(subreq);
if (ret == -1) {
status = map_nt_error_from_unix(sys_errno);
dcesrv_terminate_connection(substate->dce_conn, nt_errstr(status));
return;
}
talloc_free(substate);
if (call) {
talloc_free(call);
}
}
struct dcerpc_read_ncacn_packet_state {
struct {
} caller;
DATA_BLOB buffer;
struct ncacn_packet *pkt;
};
static int dcerpc_read_ncacn_packet_next_vector(struct tstream_context *stream,
void *private_data,
TALLOC_CTX *mem_ctx,
struct iovec **_vector,
size_t *_count);
static void dcerpc_read_ncacn_packet_done(struct tevent_req *subreq);
static struct tevent_req *dcerpc_read_ncacn_packet_send(TALLOC_CTX *mem_ctx,
struct tevent_context *ev,
struct tstream_context *stream)
{
struct tevent_req *req;
struct dcerpc_read_ncacn_packet_state *state;
struct tevent_req *subreq;
req = tevent_req_create(mem_ctx, &state,
struct dcerpc_read_ncacn_packet_state);
if (req == NULL) {
return NULL;
}
state->buffer = data_blob_const(NULL, 0);
state->pkt = talloc(state, struct ncacn_packet);
if (tevent_req_nomem(state->pkt, req)) {
goto post;
}
subreq = tstream_readv_pdu_send(state, ev,
stream,
dcerpc_read_ncacn_packet_next_vector,
state);
if (tevent_req_nomem(subreq, req)) {
goto post;
}
tevent_req_set_callback(subreq, dcerpc_read_ncacn_packet_done, req);
return req;
post:
tevent_req_post(req, ev);
return req;
}
static int dcerpc_read_ncacn_packet_next_vector(struct tstream_context *stream,
void *private_data,
TALLOC_CTX *mem_ctx,
struct iovec **_vector,
size_t *_count)
{
struct dcerpc_read_ncacn_packet_state *state =
talloc_get_type_abort(private_data,
struct dcerpc_read_ncacn_packet_state);
struct iovec *vector;
off_t ofs = 0;
if (state->buffer.length == 0) {
/* first get enough to read the fragment length */
ofs = 0;
state->buffer.length = DCERPC_FRAG_LEN_OFFSET + 2;
state->buffer.data = talloc_array(state, uint8_t,
state->buffer.length);
if (!state->buffer.data) {
return -1;
}
} else if (state->buffer.length == (DCERPC_FRAG_LEN_OFFSET + 2)) {
/* now read the fragment length and allocate the full buffer */
size_t frag_len = dcerpc_get_frag_length(&state->buffer);
ofs = state->buffer.length;
state->buffer.data = talloc_realloc(state,
state->buffer.data,
uint8_t, frag_len);
if (!state->buffer.data) {
return -1;
}
state->buffer.length = frag_len;
} else {
/* if we reach this we have a full fragment */
*_vector = NULL;
*_count = 0;
return 0;
}
/* now create the vector that we want to be filled */
vector = talloc_array(mem_ctx, struct iovec, 1);
if (!vector) {
return -1;
}
vector[0].iov_base = state->buffer.data + ofs;
vector[0].iov_len = state->buffer.length - ofs;
*_vector = vector;
*_count = 1;
return 0;
}
static void dcerpc_read_ncacn_packet_done(struct tevent_req *subreq)
{
struct tevent_req *req = tevent_req_callback_data(subreq,
struct tevent_req);
struct dcerpc_read_ncacn_packet_state *state = tevent_req_data(req,
struct dcerpc_read_ncacn_packet_state);
int ret;
int sys_errno;
struct ndr_pull *ndr;
enum ndr_err_code ndr_err;
NTSTATUS status;
ret = tstream_readv_pdu_recv(subreq, &sys_errno);
TALLOC_FREE(subreq);
if (ret == -1) {
status = map_nt_error_from_unix(sys_errno);
tevent_req_nterror(req, status);
return;
}
ndr = ndr_pull_init_blob(&state->buffer, state->pkt);
if (tevent_req_nomem(ndr, req)) {
return;
}
if (!(CVAL(ndr->data, DCERPC_DREP_OFFSET) & DCERPC_DREP_LE)) {
ndr->flags |= LIBNDR_FLAG_BIGENDIAN;
}
if (CVAL(ndr->data, DCERPC_PFC_OFFSET) & DCERPC_PFC_FLAG_OBJECT_UUID) {
ndr->flags |= LIBNDR_FLAG_OBJECT_PRESENT;
}
ndr_err = ndr_pull_ncacn_packet(ndr, NDR_SCALARS|NDR_BUFFERS, state->pkt);
TALLOC_FREE(ndr);
if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
status = ndr_map_error2ntstatus(ndr_err);
tevent_req_nterror(req, status);
return;
}
tevent_req_done(req);
}
static NTSTATUS dcerpc_read_ncacn_packet_recv(struct tevent_req *req,
TALLOC_CTX *mem_ctx,
struct ncacn_packet **pkt,
DATA_BLOB *buffer)
{
struct dcerpc_read_ncacn_packet_state *state = tevent_req_data(req,
struct dcerpc_read_ncacn_packet_state);
NTSTATUS status;
if (tevent_req_is_nterror(req, &status)) {
tevent_req_received(req);
return status;
}
*pkt = talloc_move(mem_ctx, &state->pkt);
if (buffer) {
buffer->data = talloc_move(mem_ctx, &state->buffer.data);
buffer->length = state->buffer.length;
}
tevent_req_received(req);
return NT_STATUS_OK;
}
static void dcesrv_read_fragment_done(struct tevent_req *subreq);
static void dcesrv_sock_accept(struct stream_connection *srv_conn)
{
NTSTATUS status;
struct dcesrv_socket_context *dcesrv_sock =
talloc_get_type(srv_conn->private_data, struct dcesrv_socket_context);
struct dcesrv_connection *dcesrv_conn = NULL;
int ret;
struct tevent_req *subreq;
struct loadparm_context *lp_ctx = dcesrv_sock->dcesrv_ctx->lp_ctx;
if (!srv_conn->session_info) {
status = auth_anonymous_session_info(srv_conn,
lp_ctx,
&srv_conn->session_info);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0,("dcesrv_sock_accept: auth_anonymous_session_info failed: %s\n",
nt_errstr(status)));
stream_terminate_connection(srv_conn, nt_errstr(status));
return;
}
}
status = dcesrv_endpoint_connect(dcesrv_sock->dcesrv_ctx,
srv_conn,
dcesrv_sock->endpoint,
srv_conn->session_info,
srv_conn->event.ctx,
srv_conn->msg_ctx,
srv_conn->server_id,
DCESRV_CALL_STATE_FLAG_MAY_ASYNC,
&dcesrv_conn);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0,("dcesrv_sock_accept: dcesrv_endpoint_connect failed: %s\n",
nt_errstr(status)));
stream_terminate_connection(srv_conn, nt_errstr(status));
return;
}
dcesrv_conn->transport.private_data = srv_conn;
dcesrv_conn->transport.report_output_data = dcesrv_sock_report_output_data;
TALLOC_FREE(srv_conn->event.fde);
dcesrv_conn->send_queue = tevent_queue_create(dcesrv_conn, "dcesrv send queue");
if (!dcesrv_conn->send_queue) {
status = NT_STATUS_NO_MEMORY;
DEBUG(0,("dcesrv_sock_accept: tevent_queue_create(%s)\n",
nt_errstr(status)));
stream_terminate_connection(srv_conn, nt_errstr(status));
return;
}
if (dcesrv_sock->endpoint->ep_description->transport == NCACN_NP) {
dcesrv_conn->auth_state.session_key = dcesrv_inherited_session_key;
dcesrv_conn->stream = talloc_move(dcesrv_conn,
&srv_conn->tstream);
} else {
ret = tstream_bsd_existing_socket(dcesrv_conn,
socket_get_fd(srv_conn->socket),
&dcesrv_conn->stream);
if (ret == -1) {
status = map_nt_error_from_unix(errno);
DEBUG(0, ("dcesrv_sock_accept: "
"failed to setup tstream: %s\n",
nt_errstr(status)));
stream_terminate_connection(srv_conn, nt_errstr(status));
return;
}
}
dcesrv_conn->local_address = srv_conn->local_address;
dcesrv_conn->remote_address = srv_conn->remote_address;
srv_conn->private_data = dcesrv_conn;
irpc_add_name(srv_conn->msg_ctx, "rpc_server");
subreq = dcerpc_read_ncacn_packet_send(dcesrv_conn,
dcesrv_conn->event_ctx,
dcesrv_conn->stream);
if (!subreq) {
status = NT_STATUS_NO_MEMORY;
DEBUG(0,("dcesrv_sock_accept: dcerpc_read_fragment_buffer_send(%s)\n",
nt_errstr(status)));
stream_terminate_connection(srv_conn, nt_errstr(status));
return;
}
tevent_req_set_callback(subreq, dcesrv_read_fragment_done, dcesrv_conn);
return;
}
static void dcesrv_read_fragment_done(struct tevent_req *subreq)
{
struct dcesrv_connection *dce_conn = tevent_req_callback_data(subreq,
struct dcesrv_connection);
struct ncacn_packet *pkt;
DATA_BLOB buffer;
NTSTATUS status;
status = dcerpc_read_ncacn_packet_recv(subreq, dce_conn,
&pkt, &buffer);
TALLOC_FREE(subreq);
if (!NT_STATUS_IS_OK(status)) {
dcesrv_terminate_connection(dce_conn, nt_errstr(status));
return;
}
status = dcesrv_process_ncacn_packet(dce_conn, pkt, buffer);
if (!NT_STATUS_IS_OK(status)) {
dcesrv_terminate_connection(dce_conn, nt_errstr(status));
return;
}
subreq = dcerpc_read_ncacn_packet_send(dce_conn,
dce_conn->event_ctx,
dce_conn->stream);
if (!subreq) {
status = NT_STATUS_NO_MEMORY;
dcesrv_terminate_connection(dce_conn, nt_errstr(status));
return;
}
tevent_req_set_callback(subreq, dcesrv_read_fragment_done, dce_conn);
}
static void dcesrv_sock_recv(struct stream_connection *conn, uint16_t flags)
{
struct dcesrv_connection *dce_conn = talloc_get_type(conn->private_data,
struct dcesrv_connection);
dcesrv_terminate_connection(dce_conn, "dcesrv_sock_recv triggered");
}
static void dcesrv_sock_send(struct stream_connection *conn, uint16_t flags)
{
struct dcesrv_connection *dce_conn = talloc_get_type(conn->private_data,
struct dcesrv_connection);
dcesrv_terminate_connection(dce_conn, "dcesrv_sock_send triggered");
}
static const struct stream_server_ops dcesrv_stream_ops = {
.name = "rpc",
.accept_connection = dcesrv_sock_accept,
.recv_handler = dcesrv_sock_recv,
.send_handler = dcesrv_sock_send,
};
static NTSTATUS dcesrv_add_ep_unix(struct dcesrv_context *dce_ctx,
struct loadparm_context *lp_ctx,
struct dcesrv_endpoint *e,
struct tevent_context *event_ctx, const struct model_ops *model_ops)
{
struct dcesrv_socket_context *dcesrv_sock;
uint16_t port = 1;
NTSTATUS status;
dcesrv_sock = talloc(event_ctx, struct dcesrv_socket_context);
NT_STATUS_HAVE_NO_MEMORY(dcesrv_sock);
/* remember the endpoint of this socket */
dcesrv_sock->endpoint = e;
dcesrv_sock->dcesrv_ctx = talloc_reference(dcesrv_sock, dce_ctx);
status = stream_setup_socket(event_ctx, lp_ctx,
model_ops, &dcesrv_stream_ops,
"unix", e->ep_description->endpoint, &port,
lp_socket_options(lp_ctx),
dcesrv_sock);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0,("service_setup_stream_socket(path=%s) failed - %s\n",
e->ep_description->endpoint, nt_errstr(status)));
}
return status;
}
static NTSTATUS dcesrv_add_ep_ncalrpc(struct dcesrv_context *dce_ctx,
struct loadparm_context *lp_ctx,
struct dcesrv_endpoint *e,
struct tevent_context *event_ctx, const struct model_ops *model_ops)
{
struct dcesrv_socket_context *dcesrv_sock;
uint16_t port = 1;
char *full_path;
NTSTATUS status;
if (!e->ep_description->endpoint) {
/* No identifier specified: use DEFAULT.
* DO NOT hardcode this value anywhere else. Rather, specify
* no endpoint and let the epmapper worry about it. */
e->ep_description->endpoint = talloc_strdup(dce_ctx, "DEFAULT");
}
full_path = talloc_asprintf(dce_ctx, "%s/%s", lp_ncalrpc_dir(lp_ctx),
e->ep_description->endpoint);
dcesrv_sock = talloc(event_ctx, struct dcesrv_socket_context);
NT_STATUS_HAVE_NO_MEMORY(dcesrv_sock);
/* remember the endpoint of this socket */
dcesrv_sock->endpoint = e;
dcesrv_sock->dcesrv_ctx = talloc_reference(dcesrv_sock, dce_ctx);
status = stream_setup_socket(event_ctx, lp_ctx,
model_ops, &dcesrv_stream_ops,
"unix", full_path, &port,
lp_socket_options(lp_ctx),
dcesrv_sock);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0,("service_setup_stream_socket(identifier=%s,path=%s) failed - %s\n",
e->ep_description->endpoint, full_path, nt_errstr(status)));
}
return status;
}
static NTSTATUS dcesrv_add_ep_np(struct dcesrv_context *dce_ctx,
struct loadparm_context *lp_ctx,
struct dcesrv_endpoint *e,
struct tevent_context *event_ctx, const struct model_ops *model_ops)
{
struct dcesrv_socket_context *dcesrv_sock;
NTSTATUS status;
if (e->ep_description->endpoint == NULL) {
DEBUG(0, ("Endpoint mandatory for named pipes\n"));
return NT_STATUS_INVALID_PARAMETER;
}
dcesrv_sock = talloc(event_ctx, struct dcesrv_socket_context);
NT_STATUS_HAVE_NO_MEMORY(dcesrv_sock);
/* remember the endpoint of this socket */
dcesrv_sock->endpoint = e;
dcesrv_sock->dcesrv_ctx = talloc_reference(dcesrv_sock, dce_ctx);
status = tstream_setup_named_pipe(event_ctx, lp_ctx,
model_ops, &dcesrv_stream_ops,
e->ep_description->endpoint,
dcesrv_sock);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0,("stream_setup_named_pipe(pipe=%s) failed - %s\n",
e->ep_description->endpoint, nt_errstr(status)));
return status;
}
return NT_STATUS_OK;
}
/*
add a socket address to the list of events, one event per dcerpc endpoint
*/
static NTSTATUS add_socket_rpc_tcp_iface(struct dcesrv_context *dce_ctx, struct dcesrv_endpoint *e,
struct tevent_context *event_ctx, const struct model_ops *model_ops,
const char *address)
{
struct dcesrv_socket_context *dcesrv_sock;
uint16_t port = 0;
NTSTATUS status;
if (e->ep_description->endpoint) {
port = atoi(e->ep_description->endpoint);
}
dcesrv_sock = talloc(event_ctx, struct dcesrv_socket_context);
NT_STATUS_HAVE_NO_MEMORY(dcesrv_sock);
/* remember the endpoint of this socket */
dcesrv_sock->endpoint = e;
dcesrv_sock->dcesrv_ctx = talloc_reference(dcesrv_sock, dce_ctx);
status = stream_setup_socket(event_ctx, dce_ctx->lp_ctx,
model_ops, &dcesrv_stream_ops,
"ipv4", address, &port,
lp_socket_options(dce_ctx->lp_ctx),
dcesrv_sock);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0,("service_setup_stream_socket(address=%s,port=%u) failed - %s\n",
address, port, nt_errstr(status)));
}
if (e->ep_description->endpoint == NULL) {
e->ep_description->endpoint = talloc_asprintf(dce_ctx, "%d", port);
}
return status;
}
static NTSTATUS dcesrv_add_ep_tcp(struct dcesrv_context *dce_ctx,
struct loadparm_context *lp_ctx,
struct dcesrv_endpoint *e,
struct tevent_context *event_ctx, const struct model_ops *model_ops)
{
NTSTATUS status;
/* Add TCP/IP sockets */
if (lp_interfaces(lp_ctx) && lp_bind_interfaces_only(lp_ctx)) {
int num_interfaces;
int i;
struct interface *ifaces;
load_interfaces(dce_ctx, lp_interfaces(lp_ctx), &ifaces);
num_interfaces = iface_count(ifaces);
for(i = 0; i < num_interfaces; i++) {
const char *address = iface_n_ip(ifaces, i);
status = add_socket_rpc_tcp_iface(dce_ctx, e, event_ctx, model_ops, address);
NT_STATUS_NOT_OK_RETURN(status);
}
} else {
status = add_socket_rpc_tcp_iface(dce_ctx, e, event_ctx, model_ops,
lp_socket_address(lp_ctx));
NT_STATUS_NOT_OK_RETURN(status);
}
return NT_STATUS_OK;
}
NTSTATUS dcesrv_add_ep(struct dcesrv_context *dce_ctx,
struct loadparm_context *lp_ctx,
struct dcesrv_endpoint *e,
struct tevent_context *event_ctx,
const struct model_ops *model_ops)
{
switch (e->ep_description->transport) {
case NCACN_UNIX_STREAM:
return dcesrv_add_ep_unix(dce_ctx, lp_ctx, e, event_ctx, model_ops);
case NCALRPC:
return dcesrv_add_ep_ncalrpc(dce_ctx, lp_ctx, e, event_ctx, model_ops);
case NCACN_IP_TCP:
return dcesrv_add_ep_tcp(dce_ctx, lp_ctx, e, event_ctx, model_ops);
case NCACN_NP:
return dcesrv_add_ep_np(dce_ctx, lp_ctx, e, event_ctx, model_ops);
default:
return NT_STATUS_NOT_SUPPORTED;
}
}
/*
open the dcerpc server sockets
*/
static void dcesrv_task_init(struct task_server *task)
{
NTSTATUS status;
struct dcesrv_context *dce_ctx;
struct dcesrv_endpoint *e;
const struct model_ops *model_ops;
dcerpc_server_init(task->lp_ctx);
task_server_set_title(task, "task[dcesrv]");
/* run the rpc server as a single process to allow for shard
* handles, and sharing of ldb contexts */
model_ops = process_model_startup(task->event_ctx, "single");
if (!model_ops) goto failed;
status = dcesrv_init_context(task->event_ctx,
task->lp_ctx,
lp_dcerpc_endpoint_servers(task->lp_ctx),
&dce_ctx);
if (!NT_STATUS_IS_OK(status)) goto failed;
/* Make sure the directory for NCALRPC exists */
if (!directory_exist(lp_ncalrpc_dir(task->lp_ctx))) {
mkdir(lp_ncalrpc_dir(task->lp_ctx), 0755);
}
for (e=dce_ctx->endpoint_list;e;e=e->next) {
status = dcesrv_add_ep(dce_ctx, task->lp_ctx, e, task->event_ctx, model_ops);
if (!NT_STATUS_IS_OK(status)) goto failed;
}
return;
failed:
task_server_terminate(task, "Failed to startup dcerpc server task", true);
}
NTSTATUS server_service_rpc_init(void)
{
return register_server_service("rpc", dcesrv_task_init);
}
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