| 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 1999-2007
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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 RD_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 |
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| 42 | if (tag != tagval)
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| 43 | {
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| 44 | error("expected tag %d, got %d\n", tagval, tag);
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| 45 | return False;
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| 46 | }
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| 47 |
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| 48 | in_uint8(s, len);
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| 49 |
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| 50 | if (len & 0x80)
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| 51 | {
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| 52 | len &= ~0x80;
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| 53 | *length = 0;
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| 54 | while (len--)
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| 55 | next_be(s, *length);
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| 56 | }
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| 57 | else
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| 58 | *length = len;
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| 59 |
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| 60 | return s_check(s);
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| 61 | }
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| 62 |
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| 63 | /* Output an ASN.1 BER header */
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| 64 | static void
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| 65 | ber_out_header(STREAM s, int tagval, int length)
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| 66 | {
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| 67 | if (tagval > 0xff)
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| 68 | {
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| 69 | out_uint16_be(s, tagval);
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| 70 | }
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| 71 | else
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| 72 | {
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| 73 | out_uint8(s, tagval);
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| 74 | }
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| 75 |
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| 76 | if (length >= 0x80)
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| 77 | {
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| 78 | out_uint8(s, 0x82);
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| 79 | out_uint16_be(s, length);
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| 80 | }
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| 81 | else
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| 82 | out_uint8(s, length);
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| 83 | }
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| 84 |
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| 85 | /* Output an ASN.1 BER integer */
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| 86 | static void
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| 87 | ber_out_integer(STREAM s, int value)
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| 88 | {
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| 89 | ber_out_header(s, BER_TAG_INTEGER, 2);
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| 90 | out_uint16_be(s, value);
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| 91 | }
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| 92 |
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| 93 | /* Output a DOMAIN_PARAMS structure (ASN.1 BER) */
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| 94 | static void
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| 95 | mcs_out_domain_params(STREAM s, int max_channels, int max_users, int max_tokens, int max_pdusize)
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| 96 | {
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| 97 | ber_out_header(s, MCS_TAG_DOMAIN_PARAMS, 32);
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| 98 | ber_out_integer(s, max_channels);
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| 99 | ber_out_integer(s, max_users);
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| 100 | ber_out_integer(s, max_tokens);
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| 101 | ber_out_integer(s, 1); /* num_priorities */
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| 102 | ber_out_integer(s, 0); /* min_throughput */
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| 103 | ber_out_integer(s, 1); /* max_height */
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| 104 | ber_out_integer(s, max_pdusize);
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| 105 | ber_out_integer(s, 2); /* ver_protocol */
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| 106 | }
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| 107 |
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| 108 | /* Parse a DOMAIN_PARAMS structure (ASN.1 BER) */
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| 109 | static RD_BOOL
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| 110 | mcs_parse_domain_params(STREAM s)
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| 111 | {
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| 112 | int length;
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| 113 |
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| 114 | ber_parse_header(s, MCS_TAG_DOMAIN_PARAMS, &length);
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| 115 | in_uint8s(s, length);
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| 116 |
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| 117 | return s_check(s);
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| 118 | }
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| 119 |
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| 120 | /* Send an MCS_CONNECT_INITIAL message (ASN.1 BER) */
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| 121 | static void
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| 122 | mcs_send_connect_initial(STREAM mcs_data)
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| 123 | {
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| 124 | int datalen = mcs_data->end - mcs_data->data;
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| 125 | int length = 9 + 3 * 34 + 4 + datalen;
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| 126 | STREAM s;
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| 127 |
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| 128 | s = iso_init(length + 5);
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| 129 |
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| 130 | ber_out_header(s, MCS_CONNECT_INITIAL, length);
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| 131 | ber_out_header(s, BER_TAG_OCTET_STRING, 1); /* calling domain */
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| 132 | out_uint8(s, 1);
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| 133 | ber_out_header(s, BER_TAG_OCTET_STRING, 1); /* called domain */
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| 134 | out_uint8(s, 1);
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| 135 |
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| 136 | ber_out_header(s, BER_TAG_BOOLEAN, 1);
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| 137 | out_uint8(s, 0xff); /* upward flag */
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| 138 |
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| 139 | mcs_out_domain_params(s, 34, 2, 0, 0xffff); /* target params */
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| 140 | mcs_out_domain_params(s, 1, 1, 1, 0x420); /* min params */
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| 141 | mcs_out_domain_params(s, 0xffff, 0xfc17, 0xffff, 0xffff); /* max params */
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| 142 |
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| 143 | ber_out_header(s, BER_TAG_OCTET_STRING, datalen);
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| 144 | out_uint8p(s, mcs_data->data, datalen);
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| 145 |
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| 146 | s_mark_end(s);
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| 147 | iso_send(s);
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| 148 | }
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| 149 |
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| 150 | /* Expect a MCS_CONNECT_RESPONSE message (ASN.1 BER) */
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| 151 | static RD_BOOL
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| 152 | mcs_recv_connect_response(STREAM mcs_data)
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| 153 | {
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| 154 | uint8 result;
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| 155 | int length;
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| 156 | STREAM s;
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| 157 |
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| 158 | s = iso_recv(NULL);
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| 159 | if (s == NULL)
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| 160 | return False;
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| 161 |
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| 162 | ber_parse_header(s, MCS_CONNECT_RESPONSE, &length);
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| 163 |
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| 164 | ber_parse_header(s, BER_TAG_RESULT, &length);
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| 165 | in_uint8(s, result);
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| 166 | if (result != 0)
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| 167 | {
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| 168 | error("MCS connect: %d\n", result);
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| 169 | return False;
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| 170 | }
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| 171 |
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| 172 | ber_parse_header(s, BER_TAG_INTEGER, &length);
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| 173 | in_uint8s(s, length); /* connect id */
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| 174 | mcs_parse_domain_params(s);
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| 175 |
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| 176 | ber_parse_header(s, BER_TAG_OCTET_STRING, &length);
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| 177 |
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| 178 | sec_process_mcs_data(s);
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| 179 | /*
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| 180 | if (length > mcs_data->size)
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| 181 | {
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| 182 | error("MCS data length %d, expected %d\n", length,
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| 183 | mcs_data->size);
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| 184 | length = mcs_data->size;
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| 185 | }
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| 186 |
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| 187 | in_uint8a(s, mcs_data->data, length);
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| 188 | mcs_data->p = mcs_data->data;
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| 189 | mcs_data->end = mcs_data->data + length;
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| 190 | */
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| 191 | return s_check_end(s);
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| 192 | }
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| 193 |
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| 194 | /* Send an EDrq message (ASN.1 PER) */
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| 195 | static void
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| 196 | mcs_send_edrq(void)
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| 197 | {
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| 198 | STREAM s;
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| 199 |
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| 200 | s = iso_init(5);
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| 201 |
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| 202 | out_uint8(s, (MCS_EDRQ << 2));
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| 203 | out_uint16_be(s, 1); /* height */
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| 204 | out_uint16_be(s, 1); /* interval */
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| 205 |
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| 206 | s_mark_end(s);
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| 207 | iso_send(s);
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| 208 | }
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| 209 |
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| 210 | /* Send an AUrq message (ASN.1 PER) */
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| 211 | static void
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| 212 | mcs_send_aurq(void)
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| 213 | {
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| 214 | STREAM s;
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| 215 |
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| 216 | s = iso_init(1);
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| 217 |
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| 218 | out_uint8(s, (MCS_AURQ << 2));
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| 219 |
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| 220 | s_mark_end(s);
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| 221 | iso_send(s);
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| 222 | }
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| 223 |
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| 224 | /* Expect a AUcf message (ASN.1 PER) */
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| 225 | static RD_BOOL
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| 226 | mcs_recv_aucf(uint16 * mcs_userid)
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| 227 | {
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| 228 | uint8 opcode, result;
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| 229 | STREAM s;
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| 230 |
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| 231 | s = iso_recv(NULL);
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| 232 | if (s == NULL)
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| 233 | return False;
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| 234 |
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| 235 | in_uint8(s, opcode);
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| 236 | if ((opcode >> 2) != MCS_AUCF)
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| 237 | {
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| 238 | error("expected AUcf, got %d\n", opcode);
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| 239 | return False;
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| 240 | }
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| 241 |
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| 242 | in_uint8(s, result);
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| 243 | if (result != 0)
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| 244 | {
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| 245 | error("AUrq: %d\n", result);
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| 246 | return False;
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| 247 | }
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| 248 |
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| 249 | if (opcode & 2)
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| 250 | in_uint16_be(s, *mcs_userid);
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| 251 |
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| 252 | return s_check_end(s);
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| 253 | }
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| 254 |
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| 255 | /* Send a CJrq message (ASN.1 PER) */
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| 256 | static void
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| 257 | mcs_send_cjrq(uint16 chanid)
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| 258 | {
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| 259 | STREAM s;
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| 260 |
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| 261 | DEBUG_RDP5(("Sending CJRQ for channel #%d\n", chanid));
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| 262 |
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| 263 | s = iso_init(5);
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| 264 |
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| 265 | out_uint8(s, (MCS_CJRQ << 2));
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| 266 | out_uint16_be(s, g_mcs_userid);
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| 267 | out_uint16_be(s, chanid);
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| 268 |
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| 269 | s_mark_end(s);
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| 270 | iso_send(s);
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| 271 | }
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| 272 |
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| 273 | /* Expect a CJcf message (ASN.1 PER) */
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| 274 | static RD_BOOL
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| 275 | mcs_recv_cjcf(void)
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| 276 | {
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| 277 | uint8 opcode, result;
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| 278 | STREAM s;
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| 279 |
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| 280 | s = iso_recv(NULL);
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| 281 | if (s == NULL)
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| 282 | return False;
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| 283 |
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| 284 | in_uint8(s, opcode);
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| 285 | if ((opcode >> 2) != MCS_CJCF)
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| 286 | {
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| 287 | error("expected CJcf, got %d\n", opcode);
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| 288 | return False;
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| 289 | }
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| 290 |
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| 291 | in_uint8(s, result);
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| 292 | if (result != 0)
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| 293 | {
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| 294 | error("CJrq: %d\n", result);
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| 295 | return False;
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| 296 | }
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| 297 |
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| 298 | in_uint8s(s, 4); /* mcs_userid, req_chanid */
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| 299 | if (opcode & 2)
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| 300 | in_uint8s(s, 2); /* join_chanid */
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| 301 |
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| 302 | return s_check_end(s);
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| 303 | }
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| 304 |
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| 305 | /* Initialise an MCS transport data packet */
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| 306 | STREAM
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| 307 | mcs_init(int length)
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| 308 | {
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| 309 | STREAM s;
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| 310 |
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| 311 | s = iso_init(length + 8);
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| 312 | s_push_layer(s, mcs_hdr, 8);
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| 313 |
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| 314 | return s;
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| 315 | }
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| 316 |
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| 317 | /* Send an MCS transport data packet to a specific channel */
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| 318 | void
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| 319 | mcs_send_to_channel(STREAM s, uint16 channel)
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| 320 | {
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| 321 | uint16 length;
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| 322 |
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| 323 | s_pop_layer(s, mcs_hdr);
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| 324 | length = s->end - s->p - 8;
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| 325 | length |= 0x8000;
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| 326 |
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| 327 | out_uint8(s, (MCS_SDRQ << 2));
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| 328 | out_uint16_be(s, g_mcs_userid);
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| 329 | out_uint16_be(s, channel);
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| 330 | out_uint8(s, 0x70); /* flags */
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| 331 | out_uint16_be(s, length);
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| 332 |
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| 333 | iso_send(s);
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| 334 | }
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| 335 |
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| 336 | /* Send an MCS transport data packet to the global channel */
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| 337 | void
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| 338 | mcs_send(STREAM s)
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| 339 | {
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| 340 | mcs_send_to_channel(s, MCS_GLOBAL_CHANNEL);
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| 341 | }
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| 342 |
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| 343 | /* Receive an MCS transport data packet */
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| 344 | STREAM
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| 345 | mcs_recv(uint16 * channel, uint8 * rdpver)
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| 346 | {
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| 347 | uint8 opcode, appid, length;
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| 348 | STREAM s;
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| 349 |
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| 350 | s = iso_recv(rdpver);
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| 351 | if (s == NULL)
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| 352 | return NULL;
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| 353 | if (rdpver != NULL)
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| 354 | if (*rdpver != 3)
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| 355 | return s;
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| 356 | in_uint8(s, opcode);
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| 357 | appid = opcode >> 2;
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| 358 | if (appid != MCS_SDIN)
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| 359 | {
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| 360 | if (appid != MCS_DPUM)
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| 361 | {
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| 362 | error("expected data, got %d\n", opcode);
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| 363 | }
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| 364 | return NULL;
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| 365 | }
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| 366 | in_uint8s(s, 2); /* userid */
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| 367 | in_uint16_be(s, *channel);
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| 368 | in_uint8s(s, 1); /* flags */
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| 369 | in_uint8(s, length);
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| 370 | if (length & 0x80)
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| 371 | in_uint8s(s, 1); /* second byte of length */
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| 372 | return s;
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| 373 | }
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| 374 |
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| 375 | /* Establish a connection up to the MCS layer */
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| 376 | RD_BOOL
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| 377 | mcs_connect(char *server, STREAM mcs_data, char *username)
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| 378 | {
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| 379 | unsigned int i;
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| 380 |
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| 381 | if (!iso_connect(server, username))
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| 382 | return False;
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| 383 |
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| 384 | mcs_send_connect_initial(mcs_data);
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| 385 | if (!mcs_recv_connect_response(mcs_data))
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| 386 | goto error;
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| 387 |
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| 388 | mcs_send_edrq();
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| 389 |
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| 390 | mcs_send_aurq();
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| 391 | if (!mcs_recv_aucf(&g_mcs_userid))
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| 392 | goto error;
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| 393 |
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| 394 | mcs_send_cjrq(g_mcs_userid + MCS_USERCHANNEL_BASE);
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| 395 |
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| 396 | if (!mcs_recv_cjcf())
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| 397 | goto error;
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| 398 |
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| 399 | mcs_send_cjrq(MCS_GLOBAL_CHANNEL);
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| 400 | if (!mcs_recv_cjcf())
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| 401 | goto error;
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| 402 |
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| 403 | for (i = 0; i < g_num_channels; i++)
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| 404 | {
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| 405 | mcs_send_cjrq(g_channels[i].mcs_id);
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| 406 | if (!mcs_recv_cjcf())
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| 407 | goto error;
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| 408 | }
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| 409 | return True;
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| 410 |
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| 411 | error:
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| 412 | iso_disconnect();
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| 413 | return False;
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| 414 | }
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| 415 |
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| 416 | /* Establish a connection up to the MCS layer */
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| 417 | RD_BOOL
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| 418 | mcs_reconnect(char *server, STREAM mcs_data)
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| 419 | {
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| 420 | unsigned int i;
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| 421 |
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| 422 | if (!iso_reconnect(server))
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| 423 | return False;
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| 424 |
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| 425 | mcs_send_connect_initial(mcs_data);
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| 426 | if (!mcs_recv_connect_response(mcs_data))
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| 427 | goto error;
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| 428 |
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| 429 | mcs_send_edrq();
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| 430 |
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| 431 | mcs_send_aurq();
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| 432 | if (!mcs_recv_aucf(&g_mcs_userid))
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| 433 | goto error;
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| 434 |
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| 435 | mcs_send_cjrq(g_mcs_userid + MCS_USERCHANNEL_BASE);
|
|---|
| 436 |
|
|---|
| 437 | if (!mcs_recv_cjcf())
|
|---|
| 438 | goto error;
|
|---|
| 439 |
|
|---|
| 440 | mcs_send_cjrq(MCS_GLOBAL_CHANNEL);
|
|---|
| 441 | if (!mcs_recv_cjcf())
|
|---|
| 442 | goto error;
|
|---|
| 443 |
|
|---|
| 444 | for (i = 0; i < g_num_channels; i++)
|
|---|
| 445 | {
|
|---|
| 446 | mcs_send_cjrq(g_channels[i].mcs_id);
|
|---|
| 447 | if (!mcs_recv_cjcf())
|
|---|
| 448 | goto error;
|
|---|
| 449 | }
|
|---|
| 450 | return True;
|
|---|
| 451 |
|
|---|
| 452 | error:
|
|---|
| 453 | iso_disconnect();
|
|---|
| 454 | return False;
|
|---|
| 455 | }
|
|---|
| 456 |
|
|---|
| 457 | /* Disconnect from the MCS layer */
|
|---|
| 458 | void
|
|---|
| 459 | mcs_disconnect(void)
|
|---|
| 460 | {
|
|---|
| 461 | iso_disconnect();
|
|---|
| 462 | }
|
|---|
| 463 |
|
|---|
| 464 | /* reset the state of the mcs layer */
|
|---|
| 465 | void
|
|---|
| 466 | mcs_reset_state(void)
|
|---|
| 467 | {
|
|---|
| 468 | g_mcs_userid = 0;
|
|---|
| 469 | iso_reset_state();
|
|---|
| 470 | }
|
|---|
