2000-08-15 12:23:24 +02:00
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/*
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rdesktop: A Remote Desktop Protocol client.
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RDP licensing negotiation
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2002-09-26 16:26:46 +02:00
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Copyright (C) Matthew Chapman 1999-2002
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2000-08-15 12:23:24 +02:00
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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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2002-07-14 06:29:21 +02:00
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2000-08-15 12:23:24 +02:00
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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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#include "rdesktop.h"
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2003-01-21 21:22:44 +01:00
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#ifdef WITH_OPENSSL
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#include <openssl/rc4.h>
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#else
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2000-08-15 12:23:24 +02:00
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#include "crypto/rc4.h"
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2003-01-21 21:22:44 +01:00
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#endif
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2000-08-15 12:23:24 +02:00
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extern char username[16];
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extern char hostname[16];
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2003-05-30 23:44:06 +02:00
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static uint8 g_licence_key[16];
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static uint8 g_licence_sign_key[16];
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2000-08-15 12:23:24 +02:00
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2003-05-30 23:44:06 +02:00
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BOOL g_licence_issued = False;
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2001-06-20 15:54:48 +02:00
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2000-08-15 12:23:24 +02:00
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/* Generate a session key and RC4 keys, given client and server randoms */
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2002-04-05 09:57:43 +02:00
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static void
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2002-07-30 09:18:48 +02:00
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licence_generate_keys(uint8 * client_key, uint8 * server_key, uint8 * client_rsa)
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2000-08-15 12:23:24 +02:00
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{
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uint8 session_key[48];
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uint8 temp_hash[48];
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/* Generate session key - two rounds of sec_hash_48 */
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2001-01-06 04:12:10 +01:00
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sec_hash_48(temp_hash, client_rsa, client_key, server_key, 65);
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sec_hash_48(session_key, temp_hash, server_key, client_key, 65);
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2000-08-15 12:23:24 +02:00
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/* Store first 16 bytes of session key, for generating signatures */
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2003-05-30 23:44:06 +02:00
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memcpy(g_licence_sign_key, session_key, 16);
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2000-08-15 12:23:24 +02:00
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/* Generate RC4 key */
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2003-05-30 23:44:06 +02:00
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sec_hash_16(g_licence_key, &session_key[16], client_key, server_key);
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2000-08-15 12:23:24 +02:00
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}
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2002-04-05 09:57:43 +02:00
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static void
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2002-07-18 18:38:31 +02:00
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licence_generate_hwid(uint8 * hwid)
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2002-04-05 09:57:43 +02:00
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{
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buf_out_uint32(hwid, 2);
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2002-07-29 22:17:10 +02:00
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strncpy((char *) (hwid + 4), hostname, LICENCE_HWID_SIZE - 4);
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2002-04-05 09:57:43 +02:00
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}
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/* Present an existing licence to the server */
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static void
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2002-07-18 18:38:31 +02:00
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licence_present(uint8 * client_random, uint8 * rsa_data,
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2002-07-30 09:18:48 +02:00
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uint8 * licence_data, int licence_size, uint8 * hwid, uint8 * signature)
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2002-04-05 09:57:43 +02:00
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{
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uint32 sec_flags = SEC_LICENCE_NEG;
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2002-07-18 18:38:31 +02:00
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uint16 length =
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16 + SEC_RANDOM_SIZE + SEC_MODULUS_SIZE + SEC_PADDING_SIZE +
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licence_size + LICENCE_HWID_SIZE + LICENCE_SIGNATURE_SIZE;
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2002-04-05 09:57:43 +02:00
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STREAM s;
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s = sec_init(sec_flags, length + 4);
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2003-04-16 14:52:46 +02:00
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out_uint8(s, LICENCE_TAG_PRESENT);
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2003-06-06 12:44:20 +02:00
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out_uint8(s, 2); /* version */
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2002-04-05 09:57:43 +02:00
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out_uint16_le(s, length);
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out_uint32_le(s, 1);
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out_uint16(s, 0);
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out_uint16_le(s, 0x0201);
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out_uint8p(s, client_random, SEC_RANDOM_SIZE);
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out_uint16(s, 0);
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out_uint16_le(s, (SEC_MODULUS_SIZE + SEC_PADDING_SIZE));
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out_uint8p(s, rsa_data, SEC_MODULUS_SIZE);
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out_uint8s(s, SEC_PADDING_SIZE);
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out_uint16_le(s, 1);
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out_uint16_le(s, licence_size);
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out_uint8p(s, licence_data, licence_size);
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out_uint16_le(s, 1);
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out_uint16_le(s, LICENCE_HWID_SIZE);
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out_uint8p(s, hwid, LICENCE_HWID_SIZE);
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out_uint8p(s, signature, LICENCE_SIGNATURE_SIZE);
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s_mark_end(s);
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sec_send(s, sec_flags);
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}
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2000-08-15 12:23:24 +02:00
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/* Send a licence request packet */
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2001-01-06 04:47:04 +01:00
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static void
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2002-07-30 09:18:48 +02:00
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licence_send_request(uint8 * client_random, uint8 * rsa_data, char *user, char *host)
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2000-08-15 12:23:24 +02:00
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{
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uint32 sec_flags = SEC_LICENCE_NEG;
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uint16 userlen = strlen(user) + 1;
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uint16 hostlen = strlen(host) + 1;
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2002-07-14 06:29:21 +02:00
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uint16 length = 128 + userlen + hostlen;
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2000-08-15 12:23:24 +02:00
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STREAM s;
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s = sec_init(sec_flags, length + 2);
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2003-04-16 14:52:46 +02:00
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out_uint8(s, LICENCE_TAG_REQUEST);
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2003-06-06 12:44:20 +02:00
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out_uint8(s, 2); /* version */
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2000-08-15 12:23:24 +02:00
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out_uint16_le(s, length);
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out_uint32_le(s, 1);
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2002-04-05 09:57:43 +02:00
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out_uint16(s, 0);
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out_uint16_le(s, 0xff01);
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2000-08-15 12:23:24 +02:00
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out_uint8p(s, client_random, SEC_RANDOM_SIZE);
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out_uint16(s, 0);
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out_uint16_le(s, (SEC_MODULUS_SIZE + SEC_PADDING_SIZE));
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out_uint8p(s, rsa_data, SEC_MODULUS_SIZE);
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out_uint8s(s, SEC_PADDING_SIZE);
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2003-04-16 10:19:15 +02:00
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out_uint16_le(s, LICENCE_TAG_USER);
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out_uint16_le(s, userlen);
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2000-08-15 12:23:24 +02:00
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out_uint8p(s, user, userlen);
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2003-04-16 10:19:15 +02:00
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out_uint16_le(s, LICENCE_TAG_HOST);
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out_uint16_le(s, hostlen);
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2000-08-15 12:23:24 +02:00
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out_uint8p(s, host, hostlen);
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s_mark_end(s);
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sec_send(s, sec_flags);
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}
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/* Process a licence demand packet */
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2001-01-06 04:47:04 +01:00
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static void
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licence_process_demand(STREAM s)
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2000-08-15 12:23:24 +02:00
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{
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uint8 null_data[SEC_MODULUS_SIZE];
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uint8 *server_random;
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2002-09-24 09:33:17 +02:00
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uint8 signature[LICENCE_SIGNATURE_SIZE];
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uint8 hwid[LICENCE_HWID_SIZE];
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2002-04-05 09:57:43 +02:00
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uint8 *licence_data;
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int licence_size;
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RC4_KEY crypt_key;
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2000-08-15 12:23:24 +02:00
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/* Retrieve the server random from the incoming packet */
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in_uint8p(s, server_random, SEC_RANDOM_SIZE);
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/* We currently use null client keys. This is a bit naughty but, hey,
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the security of licence negotiation isn't exactly paramount. */
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memset(null_data, 0, sizeof(null_data));
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licence_generate_keys(null_data, server_random, null_data);
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2002-04-05 09:57:43 +02:00
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licence_size = load_licence(&licence_data);
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2003-04-16 15:04:15 +02:00
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if (licence_size > 0)
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2002-04-05 09:57:43 +02:00
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{
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2002-09-15 14:36:55 +02:00
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/* Generate a signature for the HWID buffer */
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licence_generate_hwid(hwid);
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2003-05-30 23:44:06 +02:00
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sec_sign(signature, 16, g_licence_sign_key, 16, hwid, sizeof(hwid));
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2002-04-05 09:57:43 +02:00
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2002-09-15 14:36:55 +02:00
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/* Now encrypt the HWID */
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2003-05-30 23:44:06 +02:00
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RC4_set_key(&crypt_key, 16, g_licence_key);
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2002-09-15 14:36:55 +02:00
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RC4(&crypt_key, sizeof(hwid), hwid, hwid);
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2002-04-05 09:57:43 +02:00
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2002-09-15 14:36:55 +02:00
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licence_present(null_data, null_data, licence_data, licence_size, hwid, signature);
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xfree(licence_data);
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return;
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}
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2002-04-05 09:57:43 +02:00
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2002-09-15 14:36:55 +02:00
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licence_send_request(null_data, null_data, username, hostname);
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2000-08-15 12:23:24 +02:00
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}
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/* Send an authentication response packet */
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2001-01-06 04:47:04 +01:00
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static void
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2002-07-18 18:38:31 +02:00
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licence_send_authresp(uint8 * token, uint8 * crypt_hwid, uint8 * signature)
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2000-08-15 12:23:24 +02:00
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{
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uint32 sec_flags = SEC_LICENCE_NEG;
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uint16 length = 58;
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STREAM s;
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s = sec_init(sec_flags, length + 2);
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2003-04-16 14:52:46 +02:00
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out_uint8(s, LICENCE_TAG_AUTHRESP);
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2003-06-06 12:44:20 +02:00
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out_uint8(s, 2); /* version */
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2000-08-15 12:23:24 +02:00
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out_uint16_le(s, length);
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out_uint16_le(s, 1);
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out_uint16_le(s, LICENCE_TOKEN_SIZE);
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out_uint8p(s, token, LICENCE_TOKEN_SIZE);
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out_uint16_le(s, 1);
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out_uint16_le(s, LICENCE_HWID_SIZE);
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out_uint8p(s, crypt_hwid, LICENCE_HWID_SIZE);
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out_uint8p(s, signature, LICENCE_SIGNATURE_SIZE);
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s_mark_end(s);
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sec_send(s, sec_flags);
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}
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/* Parse an authentication request packet */
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2001-01-06 04:47:04 +01:00
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static BOOL
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2002-07-18 18:38:31 +02:00
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licence_parse_authreq(STREAM s, uint8 ** token, uint8 ** signature)
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2000-08-15 12:23:24 +02:00
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{
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uint16 tokenlen;
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2001-01-06 04:12:10 +01:00
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in_uint8s(s, 6); /* unknown: f8 3d 15 00 04 f6 */
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2000-08-15 12:23:24 +02:00
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in_uint16_le(s, tokenlen);
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if (tokenlen != LICENCE_TOKEN_SIZE)
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{
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2001-09-14 15:51:38 +02:00
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error("token len %d\n", tokenlen);
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2000-08-15 12:23:24 +02:00
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return False;
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}
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in_uint8p(s, *token, tokenlen);
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in_uint8p(s, *signature, LICENCE_SIGNATURE_SIZE);
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return s_check_end(s);
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}
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/* Process an authentication request packet */
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2001-01-06 04:47:04 +01:00
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static void
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licence_process_authreq(STREAM s)
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2000-08-15 12:23:24 +02:00
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{
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uint8 *in_token, *in_sig;
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2002-07-30 09:18:48 +02:00
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uint8 out_token[LICENCE_TOKEN_SIZE], decrypt_token[LICENCE_TOKEN_SIZE];
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2000-08-15 12:23:24 +02:00
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uint8 hwid[LICENCE_HWID_SIZE], crypt_hwid[LICENCE_HWID_SIZE];
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uint8 sealed_buffer[LICENCE_TOKEN_SIZE + LICENCE_HWID_SIZE];
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uint8 out_sig[LICENCE_SIGNATURE_SIZE];
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RC4_KEY crypt_key;
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/* Parse incoming packet and save the encrypted token */
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licence_parse_authreq(s, &in_token, &in_sig);
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memcpy(out_token, in_token, LICENCE_TOKEN_SIZE);
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/* Decrypt the token. It should read TEST in Unicode. */
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2003-05-30 23:44:06 +02:00
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RC4_set_key(&crypt_key, 16, g_licence_key);
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2000-08-15 12:23:24 +02:00
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RC4(&crypt_key, LICENCE_TOKEN_SIZE, in_token, decrypt_token);
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/* Generate a signature for a buffer of token and HWID */
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2002-04-05 09:57:43 +02:00
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licence_generate_hwid(hwid);
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2000-08-15 12:23:24 +02:00
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memcpy(sealed_buffer, decrypt_token, LICENCE_TOKEN_SIZE);
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memcpy(sealed_buffer + LICENCE_TOKEN_SIZE, hwid, LICENCE_HWID_SIZE);
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2003-05-30 23:44:06 +02:00
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sec_sign(out_sig, 16, g_licence_sign_key, 16, sealed_buffer, sizeof(sealed_buffer));
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2000-08-15 12:23:24 +02:00
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/* Now encrypt the HWID */
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2003-05-30 23:44:06 +02:00
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RC4_set_key(&crypt_key, 16, g_licence_key);
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2000-08-15 12:23:24 +02:00
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RC4(&crypt_key, LICENCE_HWID_SIZE, hwid, crypt_hwid);
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licence_send_authresp(out_token, crypt_hwid, out_sig);
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}
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/* Process an licence issue packet */
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2001-01-06 04:47:04 +01:00
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static void
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licence_process_issue(STREAM s)
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2000-08-15 12:23:24 +02:00
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{
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RC4_KEY crypt_key;
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uint32 length;
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uint16 check;
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2003-04-16 15:04:15 +02:00
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int i;
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2000-08-15 12:23:24 +02:00
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2001-01-06 04:12:10 +01:00
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in_uint8s(s, 2); /* 3d 45 - unknown */
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2000-08-15 12:23:24 +02:00
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in_uint16_le(s, length);
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if (!s_check_rem(s, length))
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return;
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2003-05-30 23:44:06 +02:00
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RC4_set_key(&crypt_key, 16, g_licence_key);
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2000-08-15 12:23:24 +02:00
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RC4(&crypt_key, length, s->p, s->p);
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in_uint16(s, check);
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if (check != 0)
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return;
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2003-05-30 23:44:06 +02:00
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g_licence_issued = True;
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2003-04-16 15:04:15 +02:00
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in_uint8s(s, 2); /* pad */
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|
|
|
|
/* advance to fourth string */
|
|
|
|
length = 0;
|
|
|
|
for (i = 0; i < 4; i++)
|
|
|
|
{
|
|
|
|
in_uint8s(s, length);
|
|
|
|
in_uint32_le(s, length);
|
|
|
|
if (!s_check_rem(s, length))
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
2003-05-30 23:44:06 +02:00
|
|
|
g_licence_issued = True;
|
2003-04-16 15:04:15 +02:00
|
|
|
save_licence(s->p, length);
|
2000-08-15 12:23:24 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
/* Process a licence packet */
|
2001-01-06 04:47:04 +01:00
|
|
|
void
|
|
|
|
licence_process(STREAM s)
|
2000-08-15 12:23:24 +02:00
|
|
|
{
|
2003-04-16 10:08:40 +02:00
|
|
|
uint8 tag;
|
2000-08-15 12:23:24 +02:00
|
|
|
|
2003-04-16 10:08:40 +02:00
|
|
|
in_uint8(s, tag);
|
|
|
|
in_uint8s(s, 3); /* version, length */
|
2000-08-15 12:23:24 +02:00
|
|
|
|
|
|
|
switch (tag)
|
|
|
|
{
|
|
|
|
case LICENCE_TAG_DEMAND:
|
|
|
|
licence_process_demand(s);
|
|
|
|
break;
|
|
|
|
|
|
|
|
case LICENCE_TAG_AUTHREQ:
|
|
|
|
licence_process_authreq(s);
|
|
|
|
break;
|
|
|
|
|
|
|
|
case LICENCE_TAG_ISSUE:
|
|
|
|
licence_process_issue(s);
|
|
|
|
break;
|
|
|
|
|
2002-04-05 09:57:43 +02:00
|
|
|
case LICENCE_TAG_REISSUE:
|
2000-08-15 12:23:24 +02:00
|
|
|
case LICENCE_TAG_RESULT:
|
|
|
|
break;
|
|
|
|
|
|
|
|
default:
|
2001-09-14 15:51:38 +02:00
|
|
|
unimpl("licence tag 0x%x\n", tag);
|
2000-08-15 12:23:24 +02:00
|
|
|
}
|
|
|
|
}
|