1 |
forsberg |
348 |
/* -*- c-basic-offset: 8 -*- |
2 |
matty |
3 |
rdesktop: A Remote Desktop Protocol client. |
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Protocol services - Multipoint Communications Service |
4 |
matthewc |
207 |
Copyright (C) Matthew Chapman 1999-2002 |
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matty |
3 |
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This program is free software; you can redistribute it and/or modify |
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it under the terms of the GNU General Public License as published by |
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the Free Software Foundation; either version 2 of the License, or |
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(at your option) any later version. |
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This program is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
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You should have received a copy of the GNU General Public License |
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along with this program; if not, write to the Free Software |
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
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*/ |
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matty |
10 |
#include "rdesktop.h" |
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matty |
3 |
|
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matty |
10 |
uint16 mcs_userid; |
24 |
forsberg |
348 |
extern BOOL use_rdp5; |
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matty |
10 |
|
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/* Parse an ASN.1 BER header */ |
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matty |
25 |
static BOOL |
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ber_parse_header(STREAM s, int tagval, int *length) |
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matty |
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{ |
30 |
matty |
10 |
int tag, len; |
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matty |
3 |
|
32 |
matty |
10 |
if (tagval > 0xff) |
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matty |
3 |
{ |
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matty |
10 |
in_uint16_be(s, tag); |
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matty |
3 |
} |
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matty |
10 |
else |
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matty |
3 |
{ |
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matty |
24 |
in_uint8(s, tag)} |
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matty |
3 |
|
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matty |
10 |
if (tag != tagval) |
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matty |
3 |
{ |
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matty |
30 |
error("expected tag %d, got %d\n", tagval, tag); |
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matty |
10 |
return False; |
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matty |
3 |
} |
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|
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matty |
10 |
in_uint8(s, len); |
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matty |
3 |
|
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matty |
10 |
if (len & 0x80) |
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matty |
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{ |
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matty |
10 |
len &= ~0x80; |
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*length = 0; |
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while (len--) |
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next_be(s, *length); |
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matty |
3 |
} |
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matty |
24 |
else |
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*length = len; |
57 |
matty |
3 |
|
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matty |
10 |
return s_check(s); |
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matty |
3 |
} |
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|
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matty |
10 |
/* Output an ASN.1 BER header */ |
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matty |
25 |
static void |
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ber_out_header(STREAM s, int tagval, int length) |
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matty |
3 |
{ |
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matty |
10 |
if (tagval > 0xff) |
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matty |
3 |
{ |
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matty |
10 |
out_uint16_be(s, tagval); |
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matty |
3 |
} |
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matty |
10 |
else |
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{ |
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out_uint8(s, tagval); |
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} |
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matty |
3 |
|
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matty |
10 |
if (length >= 0x80) |
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matty |
3 |
{ |
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matty |
10 |
out_uint8(s, 0x82); |
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out_uint16_be(s, length); |
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matty |
3 |
} |
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matty |
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else |
80 |
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out_uint8(s, length); |
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matty |
3 |
} |
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|
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matty |
10 |
/* Output an ASN.1 BER integer */ |
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matty |
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static void |
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ber_out_integer(STREAM s, int value) |
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matty |
3 |
{ |
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matty |
10 |
ber_out_header(s, BER_TAG_INTEGER, 2); |
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out_uint16_be(s, value); |
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matty |
3 |
} |
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|
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matty |
10 |
/* Output a DOMAIN_PARAMS structure (ASN.1 BER) */ |
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matty |
25 |
static void |
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astrand |
82 |
mcs_out_domain_params(STREAM s, int max_channels, int max_users, int max_tokens, int max_pdusize) |
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matty |
3 |
{ |
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matty |
10 |
ber_out_header(s, MCS_TAG_DOMAIN_PARAMS, 32); |
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ber_out_integer(s, max_channels); |
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ber_out_integer(s, max_users); |
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ber_out_integer(s, max_tokens); |
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matty |
24 |
ber_out_integer(s, 1); /* num_priorities */ |
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ber_out_integer(s, 0); /* min_throughput */ |
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ber_out_integer(s, 1); /* max_height */ |
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matty |
10 |
ber_out_integer(s, max_pdusize); |
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matty |
24 |
ber_out_integer(s, 2); /* ver_protocol */ |
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matty |
3 |
} |
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|
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matty |
10 |
/* Parse a DOMAIN_PARAMS structure (ASN.1 BER) */ |
107 |
matty |
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static BOOL |
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mcs_parse_domain_params(STREAM s) |
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matty |
3 |
{ |
110 |
matty |
10 |
int length; |
111 |
matty |
3 |
|
112 |
matty |
10 |
ber_parse_header(s, MCS_TAG_DOMAIN_PARAMS, &length); |
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in_uint8s(s, length); |
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return s_check(s); |
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matty |
3 |
} |
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|
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matty |
10 |
/* Send an MCS_CONNECT_INITIAL message (ASN.1 BER) */ |
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matty |
25 |
static void |
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mcs_send_connect_initial(STREAM mcs_data) |
121 |
matty |
3 |
{ |
122 |
matty |
10 |
int datalen = mcs_data->end - mcs_data->data; |
123 |
forsberg |
348 |
int length = 9 + 3 * 34 + 4 + datalen; |
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matty |
10 |
STREAM s; |
125 |
matty |
3 |
|
126 |
matty |
10 |
s = iso_init(length + 5); |
127 |
matty |
3 |
|
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matty |
10 |
ber_out_header(s, MCS_CONNECT_INITIAL, length); |
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forsberg |
348 |
ber_out_header(s, BER_TAG_OCTET_STRING, 1); /* calling domain */ |
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out_uint8(s, 1); |
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ber_out_header(s, BER_TAG_OCTET_STRING, 1); /* called domain */ |
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out_uint8(s, 1); |
133 |
matty |
3 |
|
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matty |
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ber_out_header(s, BER_TAG_BOOLEAN, 1); |
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matty |
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out_uint8(s, 0xff); /* upward flag */ |
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matty |
3 |
|
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forsberg |
348 |
mcs_out_domain_params(s, 34, 2, 0, 0xffff); /* target params */ |
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matty |
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mcs_out_domain_params(s, 1, 1, 1, 0x420); /* min params */ |
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mcs_out_domain_params(s, 0xffff, 0xfc17, 0xffff, 0xffff); /* max params */ |
140 |
matty |
3 |
|
141 |
matty |
10 |
ber_out_header(s, BER_TAG_OCTET_STRING, datalen); |
142 |
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out_uint8p(s, mcs_data->data, datalen); |
143 |
matty |
3 |
|
144 |
matty |
10 |
s_mark_end(s); |
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iso_send(s); |
146 |
matty |
3 |
} |
147 |
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|
148 |
matty |
10 |
/* Expect a MCS_CONNECT_RESPONSE message (ASN.1 BER) */ |
149 |
matty |
25 |
static BOOL |
150 |
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mcs_recv_connect_response(STREAM mcs_data) |
151 |
matty |
3 |
{ |
152 |
matty |
10 |
uint8 result; |
153 |
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int length; |
154 |
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STREAM s; |
155 |
matty |
3 |
|
156 |
matty |
10 |
s = iso_recv(); |
157 |
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if (s == NULL) |
158 |
matty |
7 |
return False; |
159 |
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|
160 |
matty |
10 |
ber_parse_header(s, MCS_CONNECT_RESPONSE, &length); |
161 |
matty |
3 |
|
162 |
matty |
10 |
ber_parse_header(s, BER_TAG_RESULT, &length); |
163 |
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in_uint8(s, result); |
164 |
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if (result != 0) |
165 |
matty |
7 |
{ |
166 |
matty |
30 |
error("MCS connect: %d\n", result); |
167 |
matty |
3 |
return False; |
168 |
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} |
169 |
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|
170 |
matty |
10 |
ber_parse_header(s, BER_TAG_INTEGER, &length); |
171 |
matty |
24 |
in_uint8s(s, length); /* connect id */ |
172 |
matty |
10 |
mcs_parse_domain_params(s); |
173 |
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|
174 |
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ber_parse_header(s, BER_TAG_OCTET_STRING, &length); |
175 |
matty |
3 |
|
176 |
forsberg |
348 |
sec_process_mcs_data(s); |
177 |
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|
/* |
178 |
|
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if (length > mcs_data->size) |
179 |
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{ |
180 |
|
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error("MCS data length %d, expected %d\n", length, |
181 |
|
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mcs_data->size); |
182 |
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length = mcs_data->size; |
183 |
|
|
} |
184 |
matty |
3 |
|
185 |
forsberg |
348 |
in_uint8a(s, mcs_data->data, length); |
186 |
|
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mcs_data->p = mcs_data->data; |
187 |
|
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mcs_data->end = mcs_data->data + length; |
188 |
|
|
*/ |
189 |
matty |
10 |
return s_check_end(s); |
190 |
matty |
3 |
} |
191 |
|
|
|
192 |
matty |
10 |
/* Send an EDrq message (ASN.1 PER) */ |
193 |
matty |
25 |
static void |
194 |
matthewc |
192 |
mcs_send_edrq(void) |
195 |
matty |
3 |
{ |
196 |
matty |
10 |
STREAM s; |
197 |
matty |
3 |
|
198 |
matty |
10 |
s = iso_init(5); |
199 |
matty |
3 |
|
200 |
matty |
10 |
out_uint8(s, (MCS_EDRQ << 2)); |
201 |
matty |
24 |
out_uint16_be(s, 1); /* height */ |
202 |
|
|
out_uint16_be(s, 1); /* interval */ |
203 |
matty |
3 |
|
204 |
matty |
10 |
s_mark_end(s); |
205 |
|
|
iso_send(s); |
206 |
matty |
3 |
} |
207 |
|
|
|
208 |
matty |
10 |
/* Send an AUrq message (ASN.1 PER) */ |
209 |
matty |
25 |
static void |
210 |
matthewc |
192 |
mcs_send_aurq(void) |
211 |
matty |
3 |
{ |
212 |
matty |
10 |
STREAM s; |
213 |
matty |
3 |
|
214 |
matty |
10 |
s = iso_init(1); |
215 |
matty |
3 |
|
216 |
matty |
10 |
out_uint8(s, (MCS_AURQ << 2)); |
217 |
matty |
3 |
|
218 |
matty |
10 |
s_mark_end(s); |
219 |
|
|
iso_send(s); |
220 |
matty |
3 |
} |
221 |
|
|
|
222 |
matty |
10 |
/* Expect a AUcf message (ASN.1 PER) */ |
223 |
matty |
25 |
static BOOL |
224 |
astrand |
64 |
mcs_recv_aucf(uint16 * mcs_userid) |
225 |
matty |
3 |
{ |
226 |
matty |
10 |
uint8 opcode, result; |
227 |
|
|
STREAM s; |
228 |
matty |
3 |
|
229 |
matty |
10 |
s = iso_recv(); |
230 |
|
|
if (s == NULL) |
231 |
matty |
3 |
return False; |
232 |
|
|
|
233 |
matty |
10 |
in_uint8(s, opcode); |
234 |
|
|
if ((opcode >> 2) != MCS_AUCF) |
235 |
matty |
3 |
{ |
236 |
matty |
30 |
error("expected AUcf, got %d\n", opcode); |
237 |
matty |
3 |
return False; |
238 |
|
|
} |
239 |
|
|
|
240 |
matty |
10 |
in_uint8(s, result); |
241 |
|
|
if (result != 0) |
242 |
|
|
{ |
243 |
matty |
30 |
error("AUrq: %d\n", result); |
244 |
matty |
10 |
return False; |
245 |
|
|
} |
246 |
matty |
3 |
|
247 |
matty |
10 |
if (opcode & 2) |
248 |
|
|
in_uint16_be(s, *mcs_userid); |
249 |
matty |
3 |
|
250 |
matty |
10 |
return s_check_end(s); |
251 |
matty |
3 |
} |
252 |
|
|
|
253 |
matty |
10 |
/* Send a CJrq message (ASN.1 PER) */ |
254 |
matty |
25 |
static void |
255 |
|
|
mcs_send_cjrq(uint16 chanid) |
256 |
matty |
3 |
{ |
257 |
matty |
10 |
STREAM s; |
258 |
matty |
3 |
|
259 |
matty |
10 |
s = iso_init(5); |
260 |
matty |
3 |
|
261 |
matty |
10 |
out_uint8(s, (MCS_CJRQ << 2)); |
262 |
|
|
out_uint16_be(s, mcs_userid); |
263 |
|
|
out_uint16_be(s, chanid); |
264 |
|
|
|
265 |
|
|
s_mark_end(s); |
266 |
|
|
iso_send(s); |
267 |
matty |
3 |
} |
268 |
|
|
|
269 |
matty |
10 |
/* Expect a CJcf message (ASN.1 PER) */ |
270 |
matty |
25 |
static BOOL |
271 |
matthewc |
192 |
mcs_recv_cjcf(void) |
272 |
matty |
3 |
{ |
273 |
matty |
10 |
uint8 opcode, result; |
274 |
|
|
STREAM s; |
275 |
matty |
3 |
|
276 |
matty |
10 |
s = iso_recv(); |
277 |
|
|
if (s == NULL) |
278 |
|
|
return False; |
279 |
matty |
3 |
|
280 |
matty |
10 |
in_uint8(s, opcode); |
281 |
|
|
if ((opcode >> 2) != MCS_CJCF) |
282 |
|
|
{ |
283 |
matty |
30 |
error("expected CJcf, got %d\n", opcode); |
284 |
matty |
10 |
return False; |
285 |
|
|
} |
286 |
matty |
3 |
|
287 |
matty |
10 |
in_uint8(s, result); |
288 |
|
|
if (result != 0) |
289 |
matty |
3 |
{ |
290 |
matty |
30 |
error("CJrq: %d\n", result); |
291 |
matty |
3 |
return False; |
292 |
|
|
} |
293 |
|
|
|
294 |
matty |
24 |
in_uint8s(s, 4); /* mcs_userid, req_chanid */ |
295 |
matty |
10 |
if (opcode & 2) |
296 |
matty |
24 |
in_uint8s(s, 2); /* join_chanid */ |
297 |
matty |
3 |
|
298 |
matty |
10 |
return s_check_end(s); |
299 |
matty |
3 |
} |
300 |
|
|
|
301 |
matty |
10 |
/* Initialise an MCS transport data packet */ |
302 |
matty |
25 |
STREAM |
303 |
|
|
mcs_init(int length) |
304 |
matty |
3 |
{ |
305 |
matty |
10 |
STREAM s; |
306 |
matty |
3 |
|
307 |
matty |
10 |
s = iso_init(length + 8); |
308 |
|
|
s_push_layer(s, mcs_hdr, 8); |
309 |
matty |
3 |
|
310 |
matty |
10 |
return s; |
311 |
matty |
3 |
} |
312 |
|
|
|
313 |
matty |
10 |
/* Send an MCS transport data packet */ |
314 |
matty |
25 |
void |
315 |
|
|
mcs_send(STREAM s) |
316 |
matty |
3 |
{ |
317 |
matty |
10 |
uint16 length; |
318 |
matty |
3 |
|
319 |
matty |
10 |
s_pop_layer(s, mcs_hdr); |
320 |
|
|
length = s->end - s->p - 8; |
321 |
|
|
length |= 0x8000; |
322 |
matty |
3 |
|
323 |
matty |
10 |
out_uint8(s, (MCS_SDRQ << 2)); |
324 |
|
|
out_uint16_be(s, mcs_userid); |
325 |
|
|
out_uint16_be(s, MCS_GLOBAL_CHANNEL); |
326 |
matty |
24 |
out_uint8(s, 0x70); /* flags */ |
327 |
matty |
10 |
out_uint16_be(s, length); |
328 |
matty |
3 |
|
329 |
matty |
10 |
iso_send(s); |
330 |
matty |
3 |
} |
331 |
|
|
|
332 |
matty |
10 |
/* Receive an MCS transport data packet */ |
333 |
matty |
25 |
STREAM |
334 |
forsberg |
348 |
mcs_recv(uint16 * channel) |
335 |
matty |
3 |
{ |
336 |
matty |
10 |
uint8 opcode, appid, length; |
337 |
|
|
STREAM s; |
338 |
matty |
3 |
|
339 |
matty |
10 |
s = iso_recv(); |
340 |
|
|
if (s == NULL) |
341 |
|
|
return NULL; |
342 |
|
|
|
343 |
|
|
in_uint8(s, opcode); |
344 |
|
|
appid = opcode >> 2; |
345 |
|
|
if (appid != MCS_SDIN) |
346 |
matty |
3 |
{ |
347 |
matty |
10 |
if (appid != MCS_DPUM) |
348 |
|
|
{ |
349 |
matty |
30 |
error("expected data, got %d\n", opcode); |
350 |
matty |
10 |
} |
351 |
|
|
return NULL; |
352 |
matty |
3 |
} |
353 |
|
|
|
354 |
forsberg |
348 |
in_uint8s(s, 2); /* userid */ |
355 |
|
|
in_uint16_be(s, *channel); |
356 |
|
|
in_uint8s(s, 1); /* flags */ |
357 |
matty |
10 |
in_uint8(s, length); |
358 |
|
|
if (length & 0x80) |
359 |
matty |
24 |
in_uint8s(s, 1); /* second byte of length */ |
360 |
matty |
3 |
|
361 |
matty |
10 |
return s; |
362 |
matty |
3 |
} |
363 |
|
|
|
364 |
matty |
10 |
/* Establish a connection up to the MCS layer */ |
365 |
matty |
25 |
BOOL |
366 |
forsberg |
348 |
mcs_connect(char *server, STREAM mcs_data, char *username) |
367 |
matty |
3 |
{ |
368 |
forsberg |
348 |
if (!iso_connect(server, username)) |
369 |
matty |
3 |
return False; |
370 |
|
|
|
371 |
matty |
10 |
mcs_send_connect_initial(mcs_data); |
372 |
|
|
if (!mcs_recv_connect_response(mcs_data)) |
373 |
|
|
goto error; |
374 |
matty |
3 |
|
375 |
matty |
10 |
mcs_send_edrq(); |
376 |
matty |
3 |
|
377 |
matty |
10 |
mcs_send_aurq(); |
378 |
|
|
if (!mcs_recv_aucf(&mcs_userid)) |
379 |
|
|
goto error; |
380 |
matty |
3 |
|
381 |
matty |
10 |
mcs_send_cjrq(mcs_userid + 1001); |
382 |
|
|
if (!mcs_recv_cjcf()) |
383 |
|
|
goto error; |
384 |
matty |
3 |
|
385 |
matty |
10 |
mcs_send_cjrq(MCS_GLOBAL_CHANNEL); |
386 |
|
|
if (!mcs_recv_cjcf()) |
387 |
|
|
goto error; |
388 |
matty |
3 |
|
389 |
forsberg |
348 |
if (use_rdp5) |
390 |
|
|
{ |
391 |
|
|
/* Note: If we send this cjrq after telling the server we support RDP4 only, |
392 |
|
|
the server won't respond with a cjcf and we will hang. */ |
393 |
|
|
mcs_send_cjrq(MCS_GLOBAL_CHANNEL + 1); /* hack - clipboard */ |
394 |
|
|
if (!mcs_recv_cjcf()) |
395 |
|
|
goto error; |
396 |
|
|
} |
397 |
|
|
|
398 |
matty |
10 |
return True; |
399 |
matty |
7 |
|
400 |
matty |
24 |
error: |
401 |
matty |
10 |
iso_disconnect(); |
402 |
|
|
return False; |
403 |
matty |
3 |
} |
404 |
matty |
7 |
|
405 |
matty |
10 |
/* Disconnect from the MCS layer */ |
406 |
matty |
25 |
void |
407 |
matthewc |
192 |
mcs_disconnect(void) |
408 |
matty |
10 |
{ |
409 |
|
|
iso_disconnect(); |
410 |
|
|
} |