| 1 | /* -*- c-basic-offset: 8 -*-
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| 2 | rdesktop: A Remote Desktop Protocol client.
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| 3 | Protocol services - Multipoint Communications Service
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| 4 | Copyright (C) Matthew Chapman 1999-2005
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| 5 |
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| 6 | This program is free software; you can redistribute it and/or modify
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| 7 | it under the terms of the GNU General Public License as published by
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| 8 | the Free Software Foundation; either version 2 of the License, or
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| 9 | (at your option) any later version.
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| 10 |
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| 11 | This program is distributed in the hope that it will be useful,
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| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 14 | GNU General Public License for more details.
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| 15 |
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| 16 | You should have received a copy of the GNU General Public License
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| 17 | along with this program; if not, write to the Free Software
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| 18 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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| 19 | */
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| 20 |
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| 21 | #include "rdesktop.h"
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| 22 |
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| 23 | uint16 g_mcs_userid;
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| 24 | extern VCHANNEL g_channels[];
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| 25 | extern unsigned int g_num_channels;
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| 26 |
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| 27 | /* Parse an ASN.1 BER header */
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| 28 | static BOOL
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| 29 | ber_parse_header(STREAM s, int tagval, int *length)
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| 30 | {
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| 31 | int tag, len;
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| 32 |
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| 33 | if (tagval > 0xff)
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| 34 | {
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| 35 | in_uint16_be(s, tag);
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| 36 | }
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| 37 | else
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| 38 | {
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| 39 | in_uint8(s, tag)}
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| 40 |
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| 41 | if (tag != tagval)
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| 42 | {
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| 43 | error("expected tag %d, got %d\n", tagval, tag);
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| 44 | return False;
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| 45 | }
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| 46 |
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| 47 | in_uint8(s, len);
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| 48 |
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| 49 | if (len & 0x80)
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| 50 | {
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| 51 | len &= ~0x80;
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| 52 | *length = 0;
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| 53 | while (len--)
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| 54 | next_be(s, *length);
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| 55 | }
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| 56 | else
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| 57 | *length = len;
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| 58 |
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| 59 | return s_check(s);
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| 60 | }
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| 61 |
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| 62 | /* Output an ASN.1 BER header */
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| 63 | static void
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| 64 | ber_out_header(STREAM s, int tagval, int length)
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| 65 | {
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| 66 | if (tagval > 0xff)
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| 67 | {
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| 68 | out_uint16_be(s, tagval);
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| 69 | }
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| 70 | else
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| 71 | {
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| 72 | out_uint8(s, tagval);
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| 73 | }
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| 74 |
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| 75 | if (length >= 0x80)
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| 76 | {
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| 77 | out_uint8(s, 0x82);
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| 78 | out_uint16_be(s, length);
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| 79 | }
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| 80 | else
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| 81 | out_uint8(s, length);
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| 82 | }
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| 83 |
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| 84 | /* Output an ASN.1 BER integer */
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| 85 | static void
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| 86 | ber_out_integer(STREAM s, int value)
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| 87 | {
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| 88 | ber_out_header(s, BER_TAG_INTEGER, 2);
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| 89 | out_uint16_be(s, value);
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| 90 | }
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| 91 |
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| 92 | /* Output a DOMAIN_PARAMS structure (ASN.1 BER) */
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| 93 | static void
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| 94 | mcs_out_domain_params(STREAM s, int max_channels, int max_users, int max_tokens, int max_pdusize)
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| 95 | {
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| 96 | ber_out_header(s, MCS_TAG_DOMAIN_PARAMS, 32);
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| 97 | ber_out_integer(s, max_channels);
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| 98 | ber_out_integer(s, max_users);
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| 99 | ber_out_integer(s, max_tokens);
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| 100 | ber_out_integer(s, 1); /* num_priorities */
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| 101 | ber_out_integer(s, 0); /* min_throughput */
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| 102 | ber_out_integer(s, 1); /* max_height */
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| 103 | ber_out_integer(s, max_pdusize);
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| 104 | ber_out_integer(s, 2); /* ver_protocol */
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| 105 | }
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| 106 |
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| 107 | /* Parse a DOMAIN_PARAMS structure (ASN.1 BER) */
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| 108 | static BOOL
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| 109 | mcs_parse_domain_params(STREAM s)
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| 110 | {
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| 111 | int length;
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| 112 |
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| 113 | ber_parse_header(s, MCS_TAG_DOMAIN_PARAMS, &length);
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| 114 | in_uint8s(s, length);
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| 115 |
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| 116 | return s_check(s);
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| 117 | }
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| 118 |
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| 119 | /* Send an MCS_CONNECT_INITIAL message (ASN.1 BER) */
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| 120 | static void
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| 121 | mcs_send_connect_initial(STREAM mcs_data)
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| 122 | {
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| 123 | int datalen = mcs_data->end - mcs_data->data;
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| 124 | int length = 9 + 3 * 34 + 4 + datalen;
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| 125 | STREAM s;
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| 126 |
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| 127 | s = iso_init(length + 5);
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| 128 |
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| 129 | ber_out_header(s, MCS_CONNECT_INITIAL, length);
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| 130 | ber_out_header(s, BER_TAG_OCTET_STRING, 1); /* calling domain */
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| 131 | out_uint8(s, 1);
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| 132 | ber_out_header(s, BER_TAG_OCTET_STRING, 1); /* called domain */
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| 133 | out_uint8(s, 1);
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| 134 |
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| 135 | ber_out_header(s, BER_TAG_BOOLEAN, 1);
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| 136 | out_uint8(s, 0xff); /* upward flag */
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| 137 |
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| 138 | mcs_out_domain_params(s, 34, 2, 0, 0xffff); /* target params */
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| 139 | mcs_out_domain_params(s, 1, 1, 1, 0x420); /* min params */
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| 140 | mcs_out_domain_params(s, 0xffff, 0xfc17, 0xffff, 0xffff); /* max params */
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| 141 |
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| 142 | ber_out_header(s, BER_TAG_OCTET_STRING, datalen);
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| 143 | out_uint8p(s, mcs_data->data, datalen);
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| 144 |
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| 145 | s_mark_end(s);
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| 146 | iso_send(s);
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| 147 | }
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| 148 |
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| 149 | /* Expect a MCS_CONNECT_RESPONSE message (ASN.1 BER) */
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| 150 | static BOOL
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| 151 | mcs_recv_connect_response(STREAM mcs_data)
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| 152 | {
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| 153 | uint8 result;
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| 154 | int length;
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| 155 | STREAM s;
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| 156 |
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| 157 | s = iso_recv(NULL);
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| 158 | if (s == NULL)
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| 159 | return False;
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| 160 |
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| 161 | ber_parse_header(s, MCS_CONNECT_RESPONSE, &length);
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| 162 |
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| 163 | ber_parse_header(s, BER_TAG_RESULT, &length);
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| 164 | in_uint8(s, result);
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| 165 | if (result != 0)
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| 166 | {
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| 167 | error("MCS connect: %d\n", result);
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| 168 | return False;
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| 169 | }
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| 170 |
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| 171 | ber_parse_header(s, BER_TAG_INTEGER, &length);
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| 172 | in_uint8s(s, length); /* connect id */
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| 173 | mcs_parse_domain_params(s);
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| 174 |
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| 175 | ber_parse_header(s, BER_TAG_OCTET_STRING, &length);
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| 176 |
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| 177 | sec_process_mcs_data(s);
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| 178 | /*
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| 179 | if (length > mcs_data->size)
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| 180 | {
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| 181 | error("MCS data length %d, expected %d\n", length,
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| 182 | mcs_data->size);
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| 183 | length = mcs_data->size;
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| 184 | }
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| 185 |
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| 186 | in_uint8a(s, mcs_data->data, length);
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| 187 | mcs_data->p = mcs_data->data;
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| 188 | mcs_data->end = mcs_data->data + length;
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| 189 | */
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| 190 | return s_check_end(s);
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| 191 | }
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| 192 |
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| 193 | /* Send an EDrq message (ASN.1 PER) */
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| 194 | static void
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| 195 | mcs_send_edrq(void)
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| 196 | {
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| 197 | STREAM s;
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| 198 |
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| 199 | s = iso_init(5);
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| 200 |
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| 201 | out_uint8(s, (MCS_EDRQ << 2));
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| 202 | out_uint16_be(s, 1); /* height */
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| 203 | out_uint16_be(s, 1); /* interval */
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| 204 |
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| 205 | s_mark_end(s);
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| 206 | iso_send(s);
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| 207 | }
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| 208 |
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| 209 | /* Send an AUrq message (ASN.1 PER) */
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| 210 | static void
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| 211 | mcs_send_aurq(void)
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| 212 | {
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| 213 | STREAM s;
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| 214 |
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| 215 | s = iso_init(1);
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| 216 |
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| 217 | out_uint8(s, (MCS_AURQ << 2));
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| 218 |
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| 219 | s_mark_end(s);
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| 220 | iso_send(s);
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| 221 | }
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| 222 |
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| 223 | /* Expect a AUcf message (ASN.1 PER) */
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| 224 | static BOOL
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| 225 | mcs_recv_aucf(uint16 * mcs_userid)
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| 226 | {
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| 227 | uint8 opcode, result;
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| 228 | STREAM s;
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| 229 |
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| 230 | s = iso_recv(NULL);
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| 231 | if (s == NULL)
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| 232 | return False;
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| 233 |
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| 234 | in_uint8(s, opcode);
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| 235 | if ((opcode >> 2) != MCS_AUCF)
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| 236 | {
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| 237 | error("expected AUcf, got %d\n", opcode);
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| 238 | return False;
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| 239 | }
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| 240 |
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| 241 | in_uint8(s, result);
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| 242 | if (result != 0)
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| 243 | {
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| 244 | error("AUrq: %d\n", result);
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| 245 | return False;
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| 246 | }
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| 247 |
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| 248 | if (opcode & 2)
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| 249 | in_uint16_be(s, *mcs_userid);
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| 250 |
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| 251 | return s_check_end(s);
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| 252 | }
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| 253 |
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| 254 | /* Send a CJrq message (ASN.1 PER) */
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| 255 | static void
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| 256 | mcs_send_cjrq(uint16 chanid)
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| 257 | {
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| 258 | STREAM s;
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| 259 |
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| 260 | DEBUG_RDP5(("Sending CJRQ for channel #%d\n", chanid));
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| 261 |
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| 262 | s = iso_init(5);
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| 263 |
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| 264 | out_uint8(s, (MCS_CJRQ << 2));
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| 265 | out_uint16_be(s, g_mcs_userid);
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| 266 | out_uint16_be(s, chanid);
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| 267 |
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| 268 | s_mark_end(s);
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| 269 | iso_send(s);
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| 270 | }
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| 271 |
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| 272 | /* Expect a CJcf message (ASN.1 PER) */
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| 273 | static BOOL
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| 274 | mcs_recv_cjcf(void)
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| 275 | {
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| 276 | uint8 opcode, result;
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| 277 | STREAM s;
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| 278 |
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| 279 | s = iso_recv(NULL);
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| 280 | if (s == NULL)
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| 281 | return False;
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| 282 |
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| 283 | in_uint8(s, opcode);
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| 284 | if ((opcode >> 2) != MCS_CJCF)
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| 285 | {
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| 286 | error("expected CJcf, got %d\n", opcode);
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| 287 | return False;
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| 288 | }
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| 289 |
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| 290 | in_uint8(s, result);
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| 291 | if (result != 0)
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| 292 | {
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| 293 | error("CJrq: %d\n", result);
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| 294 | return False;
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| 295 | }
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| 296 |
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| 297 | in_uint8s(s, 4); /* mcs_userid, req_chanid */
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| 298 | if (opcode & 2)
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| 299 | in_uint8s(s, 2); /* join_chanid */
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| 300 |
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| 301 | return s_check_end(s);
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| 302 | }
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| 303 |
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| 304 | /* Initialise an MCS transport data packet */
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| 305 | STREAM
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| 306 | mcs_init(int length)
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| 307 | {
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| 308 | STREAM s;
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| 309 |
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| 310 | s = iso_init(length + 8);
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| 311 | s_push_layer(s, mcs_hdr, 8);
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| 312 |
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| 313 | return s;
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| 314 | }
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| 315 |
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| 316 | /* Send an MCS transport data packet to a specific channel */
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| 317 | void
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| 318 | mcs_send_to_channel(STREAM s, uint16 channel)
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| 319 | {
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| 320 | uint16 length;
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| 321 |
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| 322 | s_pop_layer(s, mcs_hdr);
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| 323 | length = s->end - s->p - 8;
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| 324 | length |= 0x8000;
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| 325 |
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| 326 | out_uint8(s, (MCS_SDRQ << 2));
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| 327 | out_uint16_be(s, g_mcs_userid);
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| 328 | out_uint16_be(s, channel);
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| 329 | out_uint8(s, 0x70); /* flags */
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| 330 | out_uint16_be(s, length);
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| 331 |
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| 332 | iso_send(s);
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| 333 | }
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| 334 |
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| 335 | /* Send an MCS transport data packet to the global channel */
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| 336 | void
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| 337 | mcs_send(STREAM s)
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| 338 | {
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| 339 | mcs_send_to_channel(s, MCS_GLOBAL_CHANNEL);
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| 340 | }
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| 341 |
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| 342 | /* Receive an MCS transport data packet */
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| 343 | STREAM
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| 344 | mcs_recv(uint16 * channel, uint8 * rdpver)
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| 345 | {
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| 346 | uint8 opcode, appid, length;
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| 347 | STREAM s;
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| 348 |
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| 349 | s = iso_recv(rdpver);
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| 350 | if (s == NULL)
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| 351 | return NULL;
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| 352 | if (rdpver != NULL)
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| 353 | if (*rdpver != 3)
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| 354 | return s;
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| 355 | in_uint8(s, opcode);
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| 356 | appid = opcode >> 2;
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| 357 | if (appid != MCS_SDIN)
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| 358 | {
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| 359 | if (appid != MCS_DPUM)
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| 360 | {
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| 361 | error("expected data, got %d\n", opcode);
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| 362 | }
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| 363 | return NULL;
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| 364 | }
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| 365 | in_uint8s(s, 2); /* userid */
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| 366 | in_uint16_be(s, *channel);
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| 367 | in_uint8s(s, 1); /* flags */
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| 368 | in_uint8(s, length);
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| 369 | if (length & 0x80)
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| 370 | in_uint8s(s, 1); /* second byte of length */
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| 371 | return s;
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| 372 | }
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| 373 |
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| 374 | /* Establish a connection up to the MCS layer */
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| 375 | BOOL
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| 376 | mcs_connect(char *server, STREAM mcs_data, char *username)
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| 377 | {
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| 378 | unsigned int i;
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| 379 |
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| 380 | if (!iso_connect(server, username))
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| 381 | return False;
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| 382 |
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| 383 | mcs_send_connect_initial(mcs_data);
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| 384 | if (!mcs_recv_connect_response(mcs_data))
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| 385 | goto error;
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| 386 |
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| 387 | mcs_send_edrq();
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| 388 |
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| 389 | mcs_send_aurq();
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| 390 | if (!mcs_recv_aucf(&g_mcs_userid))
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| 391 | goto error;
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| 392 |
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| 393 | mcs_send_cjrq(g_mcs_userid + MCS_USERCHANNEL_BASE);
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| 394 |
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| 395 | if (!mcs_recv_cjcf())
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| 396 | goto error;
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| 397 |
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| 398 | mcs_send_cjrq(MCS_GLOBAL_CHANNEL);
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| 399 | if (!mcs_recv_cjcf())
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| 400 | goto error;
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| 401 |
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| 402 | for (i = 0; i < g_num_channels; i++)
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| 403 | {
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| 404 | mcs_send_cjrq(g_channels[i].mcs_id);
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| 405 | if (!mcs_recv_cjcf())
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| 406 | goto error;
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| 407 | }
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| 408 | return True;
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| 409 |
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| 410 | error:
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| 411 | iso_disconnect();
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| 412 | return False;
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| 413 | }
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| 414 |
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| 415 | /* Establish a connection up to the MCS layer */
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| 416 | BOOL
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| 417 | mcs_reconnect(char *server, STREAM mcs_data)
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| 418 | {
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| 419 | unsigned int i;
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| 420 |
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| 421 | if (!iso_reconnect(server))
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| 422 | return False;
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| 423 |
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| 424 | mcs_send_connect_initial(mcs_data);
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| 425 | if (!mcs_recv_connect_response(mcs_data))
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| 426 | goto error;
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| 427 |
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| 428 | mcs_send_edrq();
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| 429 |
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| 430 | mcs_send_aurq();
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| 431 | if (!mcs_recv_aucf(&g_mcs_userid))
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| 432 | goto error;
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| 433 |
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| 434 | mcs_send_cjrq(g_mcs_userid + MCS_USERCHANNEL_BASE);
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| 435 |
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| 436 | if (!mcs_recv_cjcf())
|
|---|
| 437 | goto error;
|
|---|
| 438 |
|
|---|
| 439 | mcs_send_cjrq(MCS_GLOBAL_CHANNEL);
|
|---|
| 440 | if (!mcs_recv_cjcf())
|
|---|
| 441 | goto error;
|
|---|
| 442 |
|
|---|
| 443 | for (i = 0; i < g_num_channels; i++)
|
|---|
| 444 | {
|
|---|
| 445 | mcs_send_cjrq(g_channels[i].mcs_id);
|
|---|
| 446 | if (!mcs_recv_cjcf())
|
|---|
| 447 | goto error;
|
|---|
| 448 | }
|
|---|
| 449 | return True;
|
|---|
| 450 |
|
|---|
| 451 | error:
|
|---|
| 452 | iso_disconnect();
|
|---|
| 453 | return False;
|
|---|
| 454 | }
|
|---|
| 455 |
|
|---|
| 456 | /* Disconnect from the MCS layer */
|
|---|
| 457 | void
|
|---|
| 458 | mcs_disconnect(void)
|
|---|
| 459 | {
|
|---|
| 460 | iso_disconnect();
|
|---|
| 461 | }
|
|---|
| 462 |
|
|---|
| 463 | /* reset the state of the mcs layer */
|
|---|
| 464 | void
|
|---|
| 465 | mcs_reset_state(void)
|
|---|
| 466 | {
|
|---|
| 467 | g_mcs_userid = 0;
|
|---|
| 468 | iso_reset_state();
|
|---|
| 469 | }
|
|---|
