630 lines
13 KiB
C
630 lines
13 KiB
C
/*
|
|
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 2 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, write to the Free Software
|
|
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
|
|
xrdp: A Remote Desktop Protocol server.
|
|
Copyright (C) Jay Sorg 2004-2005
|
|
|
|
mcs layer
|
|
|
|
*/
|
|
|
|
#include "libxrdp.h"
|
|
|
|
/*****************************************************************************/
|
|
struct xrdp_mcs* APP_CC
|
|
xrdp_mcs_create(struct xrdp_sec* owner, int sck,
|
|
struct stream* client_mcs_data,
|
|
struct stream* server_mcs_data)
|
|
{
|
|
struct xrdp_mcs* self;
|
|
|
|
self = (struct xrdp_mcs*)g_malloc(sizeof(struct xrdp_mcs), 1);
|
|
self->sec_layer = owner;
|
|
self->userid = 1;
|
|
self->chanid = 1001;
|
|
self->client_mcs_data = client_mcs_data;
|
|
self->server_mcs_data = server_mcs_data;
|
|
self->iso_layer = xrdp_iso_create(self, sck);
|
|
return self;
|
|
}
|
|
|
|
/*****************************************************************************/
|
|
void APP_CC
|
|
xrdp_mcs_delete(struct xrdp_mcs* self)
|
|
{
|
|
if (self == 0)
|
|
{
|
|
return;
|
|
}
|
|
xrdp_iso_delete(self->iso_layer);
|
|
g_free(self);
|
|
}
|
|
|
|
/*****************************************************************************/
|
|
/* returns error */
|
|
static int APP_CC
|
|
xrdp_mcs_send_cjcf(struct xrdp_mcs* self, int chanid)
|
|
{
|
|
struct stream* s;
|
|
|
|
make_stream(s);
|
|
init_stream(s, 8192);
|
|
if (xrdp_iso_init(self->iso_layer, s) != 0)
|
|
{
|
|
free_stream(s);
|
|
return 1;
|
|
}
|
|
out_uint8(s, (MCS_CJCF << 2) | 2);
|
|
out_uint8(s, 0);
|
|
out_uint16_be(s, self->userid);
|
|
out_uint16_be(s, chanid);
|
|
out_uint16_be(s, chanid);
|
|
s_mark_end(s);
|
|
if (xrdp_iso_send(self->iso_layer, s) != 0)
|
|
{
|
|
free_stream(s);
|
|
return 1;
|
|
}
|
|
free_stream(s);
|
|
return 0;
|
|
}
|
|
|
|
/*****************************************************************************/
|
|
/* returns error */
|
|
int APP_CC
|
|
xrdp_mcs_recv(struct xrdp_mcs* self, struct stream* s, int* chan)
|
|
{
|
|
int appid;
|
|
int opcode;
|
|
int len;
|
|
|
|
DEBUG((" in xrdp_mcs_recv\r\n"));
|
|
while (1)
|
|
{
|
|
if (xrdp_iso_recv(self->iso_layer, s) != 0)
|
|
{
|
|
DEBUG((" out xrdp_mcs_recv xrdp_iso_recv returned non zero\r\n"));
|
|
return 1;
|
|
}
|
|
in_uint8(s, opcode);
|
|
appid = opcode >> 2;
|
|
if (appid == MCS_DPUM)
|
|
{
|
|
DEBUG((" out xrdp_mcs_recv appid != MCS_DPUM\r\n"));
|
|
return 1;
|
|
}
|
|
if (appid == MCS_CJRQ)
|
|
{
|
|
xrdp_mcs_send_cjcf(self, self->userid + MCS_USERCHANNEL_BASE);
|
|
continue;
|
|
}
|
|
break;
|
|
}
|
|
if (appid != MCS_SDRQ)
|
|
{
|
|
DEBUG((" out xrdp_mcs_recv err got 0x%x need MCS_SDRQ\r\n", appid));
|
|
return 1;
|
|
}
|
|
in_uint8s(s, 2);
|
|
in_uint16_be(s, *chan);
|
|
in_uint8s(s, 1);
|
|
in_uint8(s, len);
|
|
if (len & 0x80)
|
|
{
|
|
in_uint8s(s, 1);
|
|
}
|
|
DEBUG((" out xrdp_mcs_recv\r\n"));
|
|
return 0;
|
|
}
|
|
|
|
/*****************************************************************************/
|
|
/* returns error */
|
|
static int APP_CC
|
|
xrdp_mcs_ber_parse_header(struct xrdp_mcs* self, struct stream* s,
|
|
int tag_val, int* len)
|
|
{
|
|
int tag;
|
|
int l;
|
|
int i;
|
|
|
|
if (tag_val > 0xff)
|
|
{
|
|
in_uint16_be(s, tag);
|
|
}
|
|
else
|
|
{
|
|
in_uint8(s, tag);
|
|
}
|
|
if (tag != tag_val)
|
|
{
|
|
return 1;
|
|
}
|
|
in_uint8(s, l);
|
|
if (l & 0x80)
|
|
{
|
|
l = l & ~0x80;
|
|
*len = 0;
|
|
while (l > 0)
|
|
{
|
|
in_uint8(s, i);
|
|
*len = (*len << 8) | i;
|
|
l--;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
*len = l;
|
|
}
|
|
if (s_check(s))
|
|
{
|
|
return 0;
|
|
}
|
|
else
|
|
{
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
/*****************************************************************************/
|
|
/* returns error */
|
|
static int APP_CC
|
|
xrdp_mcs_parse_domain_params(struct xrdp_mcs* self, struct stream* s)
|
|
{
|
|
int len;
|
|
|
|
if (xrdp_mcs_ber_parse_header(self, s, MCS_TAG_DOMAIN_PARAMS, &len) != 0)
|
|
{
|
|
return 1;
|
|
}
|
|
in_uint8s(s, len);
|
|
if (s_check(s))
|
|
{
|
|
return 0;
|
|
}
|
|
else
|
|
{
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
/*****************************************************************************/
|
|
/* returns error */
|
|
static int APP_CC
|
|
xrdp_mcs_recv_connect_initial(struct xrdp_mcs* self)
|
|
{
|
|
int len;
|
|
struct stream* s;
|
|
|
|
make_stream(s);
|
|
init_stream(s, 8192);
|
|
if (xrdp_iso_recv(self->iso_layer, s) != 0)
|
|
{
|
|
free_stream(s);
|
|
return 1;
|
|
}
|
|
if (xrdp_mcs_ber_parse_header(self, s, MCS_CONNECT_INITIAL, &len) != 0)
|
|
{
|
|
free_stream(s);
|
|
return 1;
|
|
}
|
|
if (xrdp_mcs_ber_parse_header(self, s, BER_TAG_OCTET_STRING, &len) != 0)
|
|
{
|
|
free_stream(s);
|
|
return 1;
|
|
}
|
|
in_uint8s(s, len);
|
|
if (xrdp_mcs_ber_parse_header(self, s, BER_TAG_OCTET_STRING, &len) != 0)
|
|
{
|
|
free_stream(s);
|
|
return 1;
|
|
}
|
|
in_uint8s(s, len);
|
|
if (xrdp_mcs_ber_parse_header(self, s, BER_TAG_BOOLEAN, &len) != 0)
|
|
{
|
|
free_stream(s);
|
|
return 1;
|
|
}
|
|
in_uint8s(s, len);
|
|
if (xrdp_mcs_parse_domain_params(self, s) != 0)
|
|
{
|
|
free_stream(s);
|
|
return 1;
|
|
}
|
|
if (xrdp_mcs_parse_domain_params(self, s) != 0)
|
|
{
|
|
free_stream(s);
|
|
return 1;
|
|
}
|
|
if (xrdp_mcs_parse_domain_params(self, s) != 0)
|
|
{
|
|
free_stream(s);
|
|
return 1;
|
|
}
|
|
if (xrdp_mcs_ber_parse_header(self, s, BER_TAG_OCTET_STRING, &len) != 0)
|
|
{
|
|
free_stream(s);
|
|
return 1;
|
|
}
|
|
/* make a copy of client mcs data */
|
|
init_stream(self->client_mcs_data, len);
|
|
out_uint8a(self->client_mcs_data, s->p, len);
|
|
in_uint8s(s, len);
|
|
s_mark_end(self->client_mcs_data);
|
|
if (s_check_end(s))
|
|
{
|
|
free_stream(s);
|
|
return 0;
|
|
}
|
|
else
|
|
{
|
|
free_stream(s);
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
/*****************************************************************************/
|
|
/* returns error */
|
|
static int APP_CC
|
|
xrdp_mcs_recv_edrq(struct xrdp_mcs* self)
|
|
{
|
|
int opcode;
|
|
struct stream* s;
|
|
|
|
make_stream(s);
|
|
init_stream(s, 8192);
|
|
if (xrdp_iso_recv(self->iso_layer, s) != 0)
|
|
{
|
|
free_stream(s);
|
|
return 1;
|
|
}
|
|
in_uint8(s, opcode);
|
|
if ((opcode >> 2) != MCS_EDRQ)
|
|
{
|
|
free_stream(s);
|
|
return 1;
|
|
}
|
|
in_uint8s(s, 2);
|
|
in_uint8s(s, 2);
|
|
if (opcode & 2)
|
|
{
|
|
in_uint16_be(s, self->userid);
|
|
}
|
|
if (!(s_check_end(s)))
|
|
{
|
|
free_stream(s);
|
|
return 1;
|
|
}
|
|
free_stream(s);
|
|
return 0;
|
|
}
|
|
|
|
/*****************************************************************************/
|
|
/* returns error */
|
|
static int APP_CC
|
|
xrdp_mcs_recv_aurq(struct xrdp_mcs* self)
|
|
{
|
|
int opcode;
|
|
struct stream* s;
|
|
|
|
make_stream(s);
|
|
init_stream(s, 8192);
|
|
if (xrdp_iso_recv(self->iso_layer, s) != 0)
|
|
{
|
|
free_stream(s);
|
|
return 1;
|
|
}
|
|
in_uint8(s, opcode);
|
|
if ((opcode >> 2) != MCS_AURQ)
|
|
{
|
|
free_stream(s);
|
|
return 1;
|
|
}
|
|
if (opcode & 2)
|
|
{
|
|
in_uint16_be(s, self->userid);
|
|
}
|
|
if (!(s_check_end(s)))
|
|
{
|
|
free_stream(s);
|
|
return 1;
|
|
}
|
|
free_stream(s);
|
|
return 0;
|
|
}
|
|
|
|
/*****************************************************************************/
|
|
/* returns error */
|
|
static int APP_CC
|
|
xrdp_mcs_send_aucf(struct xrdp_mcs* self)
|
|
{
|
|
struct stream* s;
|
|
|
|
make_stream(s);
|
|
init_stream(s, 8192);
|
|
if (xrdp_iso_init(self->iso_layer, s) != 0)
|
|
{
|
|
free_stream(s);
|
|
return 1;
|
|
}
|
|
out_uint8(s, ((MCS_AUCF << 2) | 2));
|
|
out_uint8s(s, 1);
|
|
out_uint16_be(s, self->userid);
|
|
s_mark_end(s);
|
|
if (xrdp_iso_send(self->iso_layer, s) != 0)
|
|
{
|
|
free_stream(s);
|
|
return 1;
|
|
}
|
|
free_stream(s);
|
|
return 0;
|
|
}
|
|
|
|
/*****************************************************************************/
|
|
/* returns error */
|
|
static int APP_CC
|
|
xrdp_mcs_recv_cjrq(struct xrdp_mcs* self)
|
|
{
|
|
int opcode;
|
|
struct stream* s;
|
|
|
|
make_stream(s);
|
|
init_stream(s, 8192);
|
|
if (xrdp_iso_recv(self->iso_layer, s) != 0)
|
|
{
|
|
free_stream(s);
|
|
return 1;
|
|
}
|
|
in_uint8(s, opcode);
|
|
if ((opcode >> 2) != MCS_CJRQ)
|
|
{
|
|
free_stream(s);
|
|
return 1;
|
|
}
|
|
in_uint8s(s, 4);
|
|
if (opcode & 2)
|
|
{
|
|
in_uint8s(s, 2);
|
|
}
|
|
if (!(s_check_end(s)))
|
|
{
|
|
free_stream(s);
|
|
return 1;
|
|
}
|
|
free_stream(s);
|
|
return 0;
|
|
}
|
|
|
|
/*****************************************************************************/
|
|
/* returns error */
|
|
static int APP_CC
|
|
xrdp_mcs_ber_out_header(struct xrdp_mcs* self, struct stream* s,
|
|
int tag_val, int len)
|
|
{
|
|
if (tag_val > 0xff)
|
|
{
|
|
out_uint16_be(s, tag_val);
|
|
}
|
|
else
|
|
{
|
|
out_uint8(s, tag_val);
|
|
}
|
|
if (len >= 0x80)
|
|
{
|
|
out_uint8(s, 0x82);
|
|
out_uint16_be(s, len);
|
|
}
|
|
else
|
|
{
|
|
out_uint8(s, len);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*****************************************************************************/
|
|
/* returns error */
|
|
static int APP_CC
|
|
xrdp_mcs_ber_out_int8(struct xrdp_mcs* self, struct stream* s, int value)
|
|
{
|
|
xrdp_mcs_ber_out_header(self, s, BER_TAG_INTEGER, 1);
|
|
out_uint8(s, value);
|
|
return 0;
|
|
}
|
|
|
|
#if 0 /* not used */
|
|
/*****************************************************************************/
|
|
/* returns error */
|
|
static int APP_CC
|
|
xrdp_mcs_ber_out_int16(struct xrdp_mcs* self, struct stream* s, int value)
|
|
{
|
|
xrdp_mcs_ber_out_header(self, s, BER_TAG_INTEGER, 2);
|
|
out_uint8(s, (value >> 8));
|
|
out_uint8(s, value);
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
/*****************************************************************************/
|
|
/* returns error */
|
|
static int APP_CC
|
|
xrdp_mcs_ber_out_int24(struct xrdp_mcs* self, struct stream* s, int value)
|
|
{
|
|
xrdp_mcs_ber_out_header(self, s, BER_TAG_INTEGER, 3);
|
|
out_uint8(s, (value >> 16));
|
|
out_uint8(s, (value >> 8));
|
|
out_uint8(s, value);
|
|
return 0;
|
|
}
|
|
|
|
/*****************************************************************************/
|
|
/* returns error */
|
|
static int APP_CC
|
|
xrdp_mcs_out_domain_params(struct xrdp_mcs* self, struct stream* s,
|
|
int max_channels,
|
|
int max_users, int max_tokens,
|
|
int max_pdu_size)
|
|
{
|
|
xrdp_mcs_ber_out_header(self, s, MCS_TAG_DOMAIN_PARAMS, 26);
|
|
xrdp_mcs_ber_out_int8(self, s, max_channels);
|
|
xrdp_mcs_ber_out_int8(self, s, max_users);
|
|
xrdp_mcs_ber_out_int8(self, s, max_tokens);
|
|
xrdp_mcs_ber_out_int8(self, s, 1);
|
|
xrdp_mcs_ber_out_int8(self, s, 0);
|
|
xrdp_mcs_ber_out_int8(self, s, 1);
|
|
xrdp_mcs_ber_out_int24(self, s, max_pdu_size);
|
|
xrdp_mcs_ber_out_int8(self, s, 2);
|
|
return 0;
|
|
}
|
|
|
|
/*****************************************************************************/
|
|
/* returns error */
|
|
static int APP_CC
|
|
xrdp_mcs_send_connect_response(struct xrdp_mcs* self)
|
|
{
|
|
int data_len;
|
|
struct stream* s;
|
|
|
|
make_stream(s);
|
|
init_stream(s, 8192);
|
|
data_len = self->server_mcs_data->end - self->server_mcs_data->data;
|
|
xrdp_iso_init(self->iso_layer, s);
|
|
xrdp_mcs_ber_out_header(self, s, MCS_CONNECT_RESPONSE, 313);
|
|
xrdp_mcs_ber_out_header(self, s, BER_TAG_RESULT, 1);
|
|
out_uint8(s, 0);
|
|
xrdp_mcs_ber_out_header(self, s, BER_TAG_INTEGER, 1);
|
|
out_uint8(s, 0);
|
|
xrdp_mcs_out_domain_params(self, s, 2, 2, 0, 0xffff);
|
|
xrdp_mcs_ber_out_header(self, s, BER_TAG_OCTET_STRING, data_len);
|
|
/* mcs data */
|
|
out_uint8a(s, self->server_mcs_data->data, data_len);
|
|
s_mark_end(s);
|
|
if (xrdp_iso_send(self->iso_layer, s) != 0)
|
|
{
|
|
free_stream(s);
|
|
return 1;
|
|
}
|
|
free_stream(s);
|
|
return 0;
|
|
}
|
|
|
|
/*****************************************************************************/
|
|
/* returns error */
|
|
int APP_CC
|
|
xrdp_mcs_incoming(struct xrdp_mcs* self)
|
|
{
|
|
DEBUG((" in xrdp_mcs_incoming\r\n"));
|
|
if (xrdp_iso_incoming(self->iso_layer) != 0)
|
|
{
|
|
return 1;
|
|
}
|
|
if (xrdp_mcs_recv_connect_initial(self) != 0)
|
|
{
|
|
return 1;
|
|
}
|
|
if (xrdp_mcs_send_connect_response(self) != 0)
|
|
{
|
|
return 1;
|
|
}
|
|
if (xrdp_mcs_recv_edrq(self) != 0)
|
|
{
|
|
return 1;
|
|
}
|
|
if (xrdp_mcs_recv_aurq(self) != 0)
|
|
{
|
|
return 1;
|
|
}
|
|
if (xrdp_mcs_send_aucf(self) != 0)
|
|
{
|
|
return 1;
|
|
}
|
|
if (xrdp_mcs_recv_cjrq(self) != 0)
|
|
{
|
|
return 1;
|
|
}
|
|
if (xrdp_mcs_send_cjcf(self, self->userid + MCS_USERCHANNEL_BASE) != 0)
|
|
{
|
|
return 1;
|
|
}
|
|
if (xrdp_mcs_recv_cjrq(self) != 0)
|
|
{
|
|
return 1;
|
|
}
|
|
if (xrdp_mcs_send_cjcf(self, MCS_GLOBAL_CHANNEL) != 0)
|
|
{
|
|
return 1;
|
|
}
|
|
DEBUG((" out xrdp_mcs_incoming\r\n"));
|
|
return 0;
|
|
}
|
|
|
|
/*****************************************************************************/
|
|
/* returns error */
|
|
int APP_CC
|
|
xrdp_mcs_init(struct xrdp_mcs* self, struct stream* s)
|
|
{
|
|
xrdp_iso_init(self->iso_layer, s);
|
|
s_push_layer(s, mcs_hdr, 8);
|
|
return 0;
|
|
}
|
|
|
|
/*****************************************************************************/
|
|
/* returns error */
|
|
int APP_CC
|
|
xrdp_mcs_send(struct xrdp_mcs* self, struct stream* s)
|
|
{
|
|
int len;
|
|
|
|
DEBUG((" in xrdp_mcs_send\r\n"));
|
|
s_pop_layer(s, mcs_hdr);
|
|
len = (s->end - s->p) - 8;
|
|
len = len | 0x8000;
|
|
out_uint8(s, MCS_SDIN << 2);
|
|
out_uint16_be(s, self->userid);
|
|
out_uint16_be(s, MCS_GLOBAL_CHANNEL);
|
|
out_uint8(s, 0x70);
|
|
out_uint16_be(s, len);
|
|
if (xrdp_iso_send(self->iso_layer, s) != 0)
|
|
{
|
|
return 1;
|
|
}
|
|
DEBUG((" out xrdp_mcs_send\r\n"));
|
|
return 0;
|
|
}
|
|
|
|
/*****************************************************************************/
|
|
/* returns error */
|
|
int APP_CC
|
|
xrdp_mcs_disconnect(struct xrdp_mcs* self)
|
|
{
|
|
struct stream* s;
|
|
|
|
make_stream(s);
|
|
init_stream(s, 8192);
|
|
if (xrdp_iso_init(self->iso_layer, s) != 0)
|
|
{
|
|
free_stream(s);
|
|
return 1;
|
|
}
|
|
out_uint8(s, (MCS_DPUM << 2) | 1);
|
|
out_uint8(s, 0x80);
|
|
s_mark_end(s);
|
|
if (xrdp_iso_send(self->iso_layer, s) != 0)
|
|
{
|
|
free_stream(s);
|
|
return 1;
|
|
}
|
|
free_stream(s);
|
|
return 0;
|
|
}
|