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|
/*
Unix SMB/CIFS implementation.
dcerpc over standard sockets transport
Copyright (C) Andrew Tridgell 2003
Copyright (C) Jelmer Vernooij 2004
Copyright (C) Rafal Szczesniak 2006
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 "lib/events/events.h"
#include "lib/socket/socket.h"
#include "lib/stream/packet.h"
#include "libcli/composite/composite.h"
#include "librpc/rpc/dcerpc.h"
#include "libcli/resolve/resolve.h"
#include "param/param.h"
/* transport private information used by general socket pipe transports */
struct sock_private {
struct fd_event *fde;
struct socket_context *sock;
char *server_name;
struct packet_context *packet;
uint32_t pending_reads;
};
/*
mark the socket dead
*/
static void sock_dead(struct dcerpc_connection *p, NTSTATUS status)
{
struct sock_private *sock = (struct sock_private *)p->transport.private_data;
if (!sock) return;
if (sock->packet) {
packet_recv_disable(sock->packet);
packet_set_fde(sock->packet, NULL);
packet_set_socket(sock->packet, NULL);
}
if (sock->fde) {
talloc_free(sock->fde);
sock->fde = NULL;
}
if (sock->sock) {
talloc_free(sock->sock);
sock->sock = NULL;
}
if (NT_STATUS_EQUAL(NT_STATUS_UNSUCCESSFUL, status)) {
status = NT_STATUS_UNEXPECTED_NETWORK_ERROR;
}
if (NT_STATUS_EQUAL(NT_STATUS_OK, status)) {
status = NT_STATUS_END_OF_FILE;
}
if (p->transport.recv_data) {
p->transport.recv_data(p, NULL, status);
}
}
/*
handle socket recv errors
*/
static void sock_error_handler(void *private, NTSTATUS status)
{
struct dcerpc_connection *p = talloc_get_type(private,
struct dcerpc_connection);
sock_dead(p, status);
}
/*
check if a blob is a complete packet
*/
static NTSTATUS sock_complete_packet(void *private, DATA_BLOB blob, size_t *size)
{
if (blob.length < DCERPC_FRAG_LEN_OFFSET+2) {
return STATUS_MORE_ENTRIES;
}
*size = dcerpc_get_frag_length(&blob);
if (*size > blob.length) {
return STATUS_MORE_ENTRIES;
}
return NT_STATUS_OK;
}
/*
process recv requests
*/
static NTSTATUS sock_process_recv(void *private, DATA_BLOB blob)
{
struct dcerpc_connection *p = talloc_get_type(private,
struct dcerpc_connection);
struct sock_private *sock = (struct sock_private *)p->transport.private_data;
sock->pending_reads--;
if (sock->pending_reads == 0) {
packet_recv_disable(sock->packet);
}
p->transport.recv_data(p, &blob, NT_STATUS_OK);
return NT_STATUS_OK;
}
/*
called when a IO is triggered by the events system
*/
static void sock_io_handler(struct event_context *ev, struct fd_event *fde,
uint16_t flags, void *private)
{
struct dcerpc_connection *p = talloc_get_type(private,
struct dcerpc_connection);
struct sock_private *sock = (struct sock_private *)p->transport.private_data;
if (flags & EVENT_FD_WRITE) {
packet_queue_run(sock->packet);
return;
}
if (sock->sock == NULL) {
return;
}
if (flags & EVENT_FD_READ) {
packet_recv(sock->packet);
}
}
/*
initiate a read request - not needed for dcerpc sockets
*/
static NTSTATUS sock_send_read(struct dcerpc_connection *p)
{
struct sock_private *sock = (struct sock_private *)p->transport.private_data;
sock->pending_reads++;
if (sock->pending_reads == 1) {
packet_recv_enable(sock->packet);
}
return NT_STATUS_OK;
}
/*
send an initial pdu in a multi-pdu sequence
*/
static NTSTATUS sock_send_request(struct dcerpc_connection *p, DATA_BLOB *data,
bool trigger_read)
{
struct sock_private *sock = (struct sock_private *)p->transport.private_data;
DATA_BLOB blob;
NTSTATUS status;
if (sock->sock == NULL) {
return NT_STATUS_CONNECTION_DISCONNECTED;
}
blob = data_blob_talloc(sock->packet, data->data, data->length);
if (blob.data == NULL) {
return NT_STATUS_NO_MEMORY;
}
status = packet_send(sock->packet, blob);
if (!NT_STATUS_IS_OK(status)) {
return status;
}
if (trigger_read) {
sock_send_read(p);
}
return NT_STATUS_OK;
}
/*
shutdown sock pipe connection
*/
static NTSTATUS sock_shutdown_pipe(struct dcerpc_connection *p, NTSTATUS status)
{
struct sock_private *sock = (struct sock_private *)p->transport.private_data;
if (sock && sock->sock) {
sock_dead(p, status);
}
return status;
}
/*
return sock server name
*/
static const char *sock_peer_name(struct dcerpc_connection *p)
{
struct sock_private *sock = talloc_get_type(p->transport.private_data, struct sock_private);
return sock->server_name;
}
/*
return remote name we make the actual connection (good for kerberos)
*/
static const char *sock_target_hostname(struct dcerpc_connection *p)
{
struct sock_private *sock = talloc_get_type(p->transport.private_data, struct sock_private);
return sock->server_name;
}
struct pipe_open_socket_state {
struct dcerpc_connection *conn;
struct socket_context *socket_ctx;
struct sock_private *sock;
struct socket_address *server;
const char *target_hostname;
enum dcerpc_transport_t transport;
};
static void continue_socket_connect(struct composite_context *ctx)
{
struct dcerpc_connection *conn;
struct sock_private *sock;
struct composite_context *c = talloc_get_type(ctx->async.private_data,
struct composite_context);
struct pipe_open_socket_state *s = talloc_get_type(c->private_data,
struct pipe_open_socket_state);
/* make it easier to write a function calls */
conn = s->conn;
sock = s->sock;
c->status = socket_connect_recv(ctx);
if (!NT_STATUS_IS_OK(c->status)) {
DEBUG(0, ("Failed to connect host %s on port %d - %s\n",
s->server->addr, s->server->port,
nt_errstr(c->status)));
composite_error(c, c->status);
return;
}
/*
fill in the transport methods
*/
conn->transport.transport = s->transport;
conn->transport.private_data = NULL;
conn->transport.send_request = sock_send_request;
conn->transport.send_read = sock_send_read;
conn->transport.recv_data = NULL;
conn->transport.shutdown_pipe = sock_shutdown_pipe;
conn->transport.peer_name = sock_peer_name;
conn->transport.target_hostname = sock_target_hostname;
sock->sock = s->socket_ctx;
sock->pending_reads = 0;
sock->server_name = strupper_talloc(sock, s->target_hostname);
sock->fde = event_add_fd(conn->event_ctx, sock->sock, socket_get_fd(sock->sock),
EVENT_FD_READ, sock_io_handler, conn);
conn->transport.private_data = sock;
sock->packet = packet_init(sock);
if (sock->packet == NULL) {
composite_error(c, NT_STATUS_NO_MEMORY);
talloc_free(sock);
return;
}
packet_set_private(sock->packet, conn);
packet_set_socket(sock->packet, sock->sock);
packet_set_callback(sock->packet, sock_process_recv);
packet_set_full_request(sock->packet, sock_complete_packet);
packet_set_error_handler(sock->packet, sock_error_handler);
packet_set_event_context(sock->packet, conn->event_ctx);
packet_set_fde(sock->packet, sock->fde);
packet_set_serialise(sock->packet);
packet_set_initial_read(sock->packet, 16);
/* ensure we don't get SIGPIPE */
BlockSignals(true, SIGPIPE);
composite_done(c);
}
static struct composite_context *dcerpc_pipe_open_socket_send(TALLOC_CTX *mem_ctx,
struct dcerpc_connection *cn,
struct socket_address *server,
const char *target_hostname,
enum dcerpc_transport_t transport)
{
struct composite_context *c;
struct pipe_open_socket_state *s;
struct composite_context *conn_req;
c = composite_create(mem_ctx, cn->event_ctx);
if (c == NULL) return NULL;
s = talloc_zero(c, struct pipe_open_socket_state);
if (composite_nomem(s, c)) return c;
c->private_data = s;
s->conn = cn;
s->transport = transport;
s->server = talloc_reference(c, server);
if (composite_nomem(s->server, c)) return c;
s->target_hostname = talloc_reference(s, target_hostname);
s->sock = talloc(cn, struct sock_private);
if (composite_nomem(s->sock, c)) return c;
c->status = socket_create(server->family, SOCKET_TYPE_STREAM, &s->socket_ctx, 0);
if (!composite_is_ok(c)) return c;
talloc_steal(s->sock, s->socket_ctx);
conn_req = socket_connect_send(s->socket_ctx, NULL, s->server, 0, lp_name_resolve_order(global_loadparm),
c->event_ctx);
composite_continue(c, conn_req, continue_socket_connect, c);
return c;
}
static NTSTATUS dcerpc_pipe_open_socket_recv(struct composite_context *c)
{
NTSTATUS status = composite_wait(c);
talloc_free(c);
return status;
}
struct pipe_tcp_state {
const char *server;
const char *target_hostname;
const char *address;
uint32_t port;
struct socket_address *srvaddr;
struct dcerpc_connection *conn;
};
#if 0 /* disabled till we can resolve names to ipv6 addresses */
static void continue_ipv6_open_socket(struct composite_context *ctx);
#endif
static void continue_ipv4_open_socket(struct composite_context *ctx);
static void continue_ip_resolve_name(struct composite_context *ctx);
static void continue_ip_resolve_name(struct composite_context *ctx)
{
struct composite_context *c = talloc_get_type(ctx->async.private_data,
struct composite_context);
struct pipe_tcp_state *s = talloc_get_type(c->private_data,
struct pipe_tcp_state);
struct composite_context *sock_ipv4_req;
c->status = resolve_name_recv(ctx, s, &s->address);
if (!composite_is_ok(c)) return;
/* prepare server address using host ip:port and transport name */
s->srvaddr = socket_address_from_strings(s->conn, "ipv4", s->address, s->port);
if (composite_nomem(s->srvaddr, c)) return;
/* resolve_nbt_name gives only ipv4 ... - send socket open request */
sock_ipv4_req = dcerpc_pipe_open_socket_send(c, s->conn,
s->srvaddr, s->target_hostname,
NCACN_IP_TCP);
composite_continue(c, sock_ipv4_req, continue_ipv4_open_socket, c);
}
/*
Stage 2 of dcerpc_pipe_open_tcp_send: receive result of pipe open request
on IPv6 and send the request on IPv4 unless IPv6 transport succeeded.
*/
#if 0 /* disabled till we can resolve names to ipv6 addresses */
static void continue_ipv6_open_socket(struct composite_context *ctx)
{
struct composite_context *c = talloc_get_type(ctx->async.private_data,
struct composite_context);
struct pipe_tcp_state *s = talloc_get_type(c->private_data,
struct pipe_tcp_state);
struct composite_context *sock_ipv4_req;
/* receive result of socket open request */
c->status = dcerpc_pipe_open_socket_recv(ctx);
if (NT_STATUS_IS_OK(c->status)) {
composite_done(c);
return;
}
talloc_free(s->srvaddr);
/* prepare server address using host:ip and transport name */
s->srvaddr = socket_address_from_strings(s->conn, "ipv4", s->address, s->port);
if (composite_nomem(s->srvaddr, c)) return;
/* try IPv4 if IPv6 fails */
sock_ipv4_req = dcerpc_pipe_open_socket_send(c, s->conn,
s->srvaddr, s->target_hostname,
NCACN_IP_TCP);
composite_continue(c, sock_ipv4_req, continue_ipv4_open_socket, c);
}
#endif
/*
Stage 2 of dcerpc_pipe_open_tcp_send: receive result of pipe open request
on IPv4 transport.
*/
static void continue_ipv4_open_socket(struct composite_context *ctx)
{
struct composite_context *c = talloc_get_type(ctx->async.private_data,
struct composite_context);
struct pipe_tcp_state *s = talloc_get_type(c->private_data,
struct pipe_tcp_state);
/* receive result socket open request */
c->status = dcerpc_pipe_open_socket_recv(ctx);
if (!NT_STATUS_IS_OK(c->status)) {
/* something went wrong... */
DEBUG(0, ("Failed to connect host %s (%s) on port %d - %s.\n",
s->address, s->target_hostname,
s->port, nt_errstr(c->status)));
composite_error(c, c->status);
return;
}
composite_done(c);
}
/*
Send rpc pipe open request to given host:port using
tcp/ip transport
*/
struct composite_context* dcerpc_pipe_open_tcp_send(struct dcerpc_connection *conn,
const char *server,
const char *target_hostname,
uint32_t port,
const char **name_resolve_order)
{
struct composite_context *c;
struct pipe_tcp_state *s;
struct composite_context *resolve_req;
struct nbt_name name;
/* composite context allocation and setup */
c = composite_create(conn, conn->event_ctx);
if (c == NULL) return NULL;
s = talloc_zero(c, struct pipe_tcp_state);
if (composite_nomem(s, c)) return c;
c->private_data = s;
/* store input parameters in state structure */
s->server = talloc_strdup(c, server);
if (composite_nomem(s->server, c)) return c;
if (target_hostname) {
s->target_hostname = talloc_strdup(c, target_hostname);
if (composite_nomem(s->target_hostname, c)) return c;
}
s->port = port;
s->conn = conn;
make_nbt_name_server(&name, server);
resolve_req = resolve_name_send(&name, c->event_ctx, name_resolve_order);
composite_continue(c, resolve_req, continue_ip_resolve_name, c);
return c;
}
/*
Receive result of pipe open request on tcp/ip
*/
NTSTATUS dcerpc_pipe_open_tcp_recv(struct composite_context *c)
{
NTSTATUS status;
status = composite_wait(c);
talloc_free(c);
return status;
}
struct pipe_unix_state {
const char *path;
struct socket_address *srvaddr;
struct dcerpc_connection *conn;
};
/*
Stage 2 of dcerpc_pipe_open_unix_stream_send: receive result of pipe open
request on unix socket.
*/
static void continue_unix_open_socket(struct composite_context *ctx)
{
struct composite_context *c = talloc_get_type(ctx->async.private_data,
struct composite_context);
c->status = dcerpc_pipe_open_socket_recv(ctx);
if (NT_STATUS_IS_OK(c->status)) {
composite_done(c);
return;
}
composite_error(c, c->status);
}
/*
Send pipe open request on unix socket
*/
struct composite_context *dcerpc_pipe_open_unix_stream_send(struct dcerpc_connection *conn,
const char *path)
{
struct composite_context *c;
struct composite_context *sock_unix_req;
struct pipe_unix_state *s;
/* composite context allocation and setup */
c = composite_create(conn, conn->event_ctx);
if (c == NULL) return NULL;
s = talloc_zero(c, struct pipe_unix_state);
if (composite_nomem(s, c)) return c;
c->private_data = s;
/* store parameters in state structure */
s->path = talloc_strdup(c, path);
if (composite_nomem(s->path, c)) return c;
s->conn = conn;
/* prepare server address using socket path and transport name */
s->srvaddr = socket_address_from_strings(conn, "unix", s->path, 0);
if (composite_nomem(s->srvaddr, c)) return c;
/* send socket open request */
sock_unix_req = dcerpc_pipe_open_socket_send(c, s->conn,
s->srvaddr, NULL,
NCALRPC);
composite_continue(c, sock_unix_req, continue_unix_open_socket, c);
return c;
}
/*
Receive result of pipe open request on unix socket
*/
NTSTATUS dcerpc_pipe_open_unix_stream_recv(struct composite_context *c)
{
NTSTATUS status = composite_wait(c);
talloc_free(c);
return status;
}
struct pipe_np_state {
char *full_path;
struct socket_address *srvaddr;
struct dcerpc_connection *conn;
};
/*
Stage 2 of dcerpc_pipe_open_pipe_send: receive socket open request
*/
static void continue_np_open_socket(struct composite_context *ctx)
{
struct composite_context *c = talloc_get_type(ctx->async.private_data,
struct composite_context);
c->status = dcerpc_pipe_open_socket_recv(ctx);
if (!composite_is_ok(c)) return;
composite_done(c);
}
/*
Send pipe open request on ncalrpc
*/
struct composite_context* dcerpc_pipe_open_pipe_send(struct dcerpc_connection *conn,
const char *ncalrpc_dir,
const char *identifier)
{
char *canon = NULL;
struct composite_context *c;
struct composite_context *sock_np_req;
struct pipe_np_state *s;
/* composite context allocation and setup */
c = composite_create(conn, conn->event_ctx);
if (c == NULL) return NULL;
s = talloc_zero(c, struct pipe_np_state);
if (composite_nomem(s, c)) return c;
c->private_data = s;
/* store parameters in state structure */
canon = talloc_strdup(s, identifier);
if (composite_nomem(canon, c)) return c;
s->conn = conn;
string_replace(canon, '/', '\\');
s->full_path = talloc_asprintf(canon, "%s/%s", ncalrpc_dir, canon);
if (composite_nomem(s->full_path, c)) return c;
/* prepare server address using path and transport name */
s->srvaddr = socket_address_from_strings(conn, "unix", s->full_path, 0);
if (composite_nomem(s->srvaddr, c)) return c;
/* send socket open request */
sock_np_req = dcerpc_pipe_open_socket_send(c, s->conn, s->srvaddr, NULL, NCALRPC);
composite_continue(c, sock_np_req, continue_np_open_socket, c);
return c;
}
/*
Receive result of pipe open request on ncalrpc
*/
NTSTATUS dcerpc_pipe_open_pipe_recv(struct composite_context *c)
{
NTSTATUS status = composite_wait(c);
talloc_free(c);
return status;
}
/*
Open a rpc pipe on a named pipe - sync version
*/
NTSTATUS dcerpc_pipe_open_pipe(struct dcerpc_connection *conn, const char *ncalrpc_dir, const char *identifier)
{
struct composite_context *c = dcerpc_pipe_open_pipe_send(conn, ncalrpc_dir, identifier);
return dcerpc_pipe_open_pipe_recv(c);
}
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