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matty |
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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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matthewc |
207 |
Copyright (C) Matthew Chapman 1999-2002 |
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matty |
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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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jsorg71 |
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|
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matty |
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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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#include "crypto/rc4.h" |
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extern char username[16]; |
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extern char hostname[16]; |
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extern BOOL licence; |
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static uint8 licence_key[16]; |
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static uint8 licence_sign_key[16]; |
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matty |
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BOOL licence_issued = False; |
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matty |
10 |
/* Generate a session key and RC4 keys, given client and server randoms */ |
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matthewc |
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static void |
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astrand |
82 |
licence_generate_keys(uint8 * client_key, uint8 * server_key, uint8 * client_rsa) |
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matty |
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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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matty |
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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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matty |
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|
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/* Store first 16 bytes of session key, for generating signatures */ |
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matty |
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memcpy(licence_sign_key, session_key, 16); |
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matty |
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|
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/* Generate RC4 key */ |
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sec_hash_16(licence_key, &session_key[16], client_key, server_key); |
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} |
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matthewc |
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static void |
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astrand |
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licence_generate_hwid(uint8 * hwid) |
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matthewc |
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{ |
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buf_out_uint32(hwid, 2); |
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astrand |
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strncpy((char *) (hwid + 4), hostname, LICENCE_HWID_SIZE - 4); |
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matthewc |
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} |
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matthewc |
159 |
#ifdef SAVE_LICENCE |
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matthewc |
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/* Present an existing licence to the server */ |
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static void |
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astrand |
64 |
licence_present(uint8 * client_random, uint8 * rsa_data, |
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astrand |
82 |
uint8 * licence_data, int licence_size, uint8 * hwid, uint8 * signature) |
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matthewc |
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{ |
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uint32 sec_flags = SEC_LICENCE_NEG; |
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astrand |
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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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matthewc |
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STREAM s; |
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s = sec_init(sec_flags, length + 4); |
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out_uint16_le(s, LICENCE_TAG_PRESENT); |
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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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matthewc |
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#endif |
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matthewc |
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|
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matty |
10 |
/* Send a licence request packet */ |
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matty |
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static void |
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astrand |
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licence_send_request(uint8 * client_random, uint8 * rsa_data, char *user, char *host) |
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matty |
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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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jsorg71 |
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uint16 length = 128 + userlen + hostlen; |
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matty |
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STREAM s; |
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s = sec_init(sec_flags, length + 2); |
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out_uint16_le(s, LICENCE_TAG_REQUEST); |
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out_uint16_le(s, length); |
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out_uint32_le(s, 1); |
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matthewc |
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out_uint16(s, 0); |
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out_uint16_le(s, 0xff01); |
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matty |
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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(s, LICENCE_TAG_USER); |
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out_uint16(s, userlen); |
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out_uint8p(s, user, userlen); |
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out_uint16(s, LICENCE_TAG_HOST); |
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out_uint16(s, hostlen); |
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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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matty |
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static void |
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licence_process_demand(STREAM s) |
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matty |
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{ |
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uint8 null_data[SEC_MODULUS_SIZE]; |
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matthewc |
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uint8 *server_random; |
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#ifdef SAVE_LICENCE |
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uint8 signature[LICENCE_SIGNATURE_SIZE]; |
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matthewc |
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uint8 hwid[LICENCE_HWID_SIZE]; |
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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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matthewc |
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#endif |
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matty |
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|
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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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matthewc |
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#ifdef SAVE_LICENCE |
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matthewc |
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licence_size = load_licence(&licence_data); |
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matthewc |
159 |
if (licence_size != -1) |
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matthewc |
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{ |
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matthewc |
159 |
/* Generate a signature for the HWID buffer */ |
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licence_generate_hwid(hwid); |
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sec_sign(signature, 16, licence_sign_key, 16, hwid, sizeof(hwid)); |
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/* Now encrypt the HWID */ |
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RC4_set_key(&crypt_key, 16, licence_key); |
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RC4(&crypt_key, sizeof(hwid), hwid, hwid); |
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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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matthewc |
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return; |
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} |
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matthewc |
159 |
#endif |
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matthewc |
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|
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matthewc |
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licence_send_request(null_data, null_data, username, hostname); |
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matty |
10 |
} |
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/* Send an authentication response packet */ |
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matty |
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static void |
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astrand |
64 |
licence_send_authresp(uint8 * token, uint8 * crypt_hwid, uint8 * signature) |
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matty |
10 |
{ |
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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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out_uint16_le(s, LICENCE_TAG_AUTHRESP); |
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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 */ |
208 |
matty |
25 |
static BOOL |
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astrand |
64 |
licence_parse_authreq(STREAM s, uint8 ** token, uint8 ** signature) |
210 |
matty |
10 |
{ |
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uint16 tokenlen; |
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matty |
24 |
in_uint8s(s, 6); /* unknown: f8 3d 15 00 04 f6 */ |
214 |
matty |
10 |
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in_uint16_le(s, tokenlen); |
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if (tokenlen != LICENCE_TOKEN_SIZE) |
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{ |
218 |
matty |
30 |
error("token len %d\n", tokenlen); |
219 |
matty |
10 |
return False; |
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} |
221 |
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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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228 |
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/* Process an authentication request packet */ |
229 |
matty |
25 |
static void |
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licence_process_authreq(STREAM s) |
231 |
matty |
10 |
{ |
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uint8 *in_token, *in_sig; |
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astrand |
82 |
uint8 out_token[LICENCE_TOKEN_SIZE], decrypt_token[LICENCE_TOKEN_SIZE]; |
234 |
matty |
10 |
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; |
238 |
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239 |
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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. */ |
244 |
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RC4_set_key(&crypt_key, 16, licence_key); |
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RC4(&crypt_key, LICENCE_TOKEN_SIZE, in_token, decrypt_token); |
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247 |
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/* Generate a signature for a buffer of token and HWID */ |
248 |
matthewc |
39 |
licence_generate_hwid(hwid); |
249 |
matty |
10 |
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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astrand |
82 |
sec_sign(out_sig, 16, licence_sign_key, 16, sealed_buffer, sizeof(sealed_buffer)); |
252 |
matty |
10 |
|
253 |
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/* Deliberately break signature if licencing disabled */ |
254 |
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if (!licence) |
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memset(out_sig, 0, sizeof(out_sig)); |
256 |
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257 |
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/* Now encrypt the HWID */ |
258 |
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RC4_set_key(&crypt_key, 16, licence_key); |
259 |
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RC4(&crypt_key, LICENCE_HWID_SIZE, hwid, crypt_hwid); |
260 |
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261 |
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licence_send_authresp(out_token, crypt_hwid, out_sig); |
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} |
263 |
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264 |
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/* Process an licence issue packet */ |
265 |
matty |
25 |
static void |
266 |
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licence_process_issue(STREAM s) |
267 |
matty |
10 |
{ |
268 |
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RC4_KEY crypt_key; |
269 |
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uint32 length; |
270 |
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uint16 check; |
271 |
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272 |
matty |
24 |
in_uint8s(s, 2); /* 3d 45 - unknown */ |
273 |
matty |
10 |
in_uint16_le(s, length); |
274 |
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if (!s_check_rem(s, length)) |
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return; |
276 |
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277 |
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RC4_set_key(&crypt_key, 16, licence_key); |
278 |
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RC4(&crypt_key, length, s->p, s->p); |
279 |
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280 |
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in_uint16(s, check); |
281 |
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if (check != 0) |
282 |
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return; |
283 |
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284 |
matty |
28 |
licence_issued = True; |
285 |
matthewc |
159 |
|
286 |
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#ifdef SAVE_LICENCE |
287 |
astrand |
64 |
save_licence(s->p, length - 2); |
288 |
matthewc |
159 |
#endif |
289 |
matty |
10 |
} |
290 |
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|
291 |
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/* Process a licence packet */ |
292 |
matty |
25 |
void |
293 |
|
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licence_process(STREAM s) |
294 |
matty |
10 |
{ |
295 |
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uint16 tag; |
296 |
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297 |
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in_uint16_le(s, tag); |
298 |
matty |
24 |
in_uint8s(s, 2); /* length */ |
299 |
matty |
10 |
|
300 |
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switch (tag) |
301 |
|
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{ |
302 |
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case LICENCE_TAG_DEMAND: |
303 |
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licence_process_demand(s); |
304 |
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break; |
305 |
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306 |
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case LICENCE_TAG_AUTHREQ: |
307 |
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licence_process_authreq(s); |
308 |
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break; |
309 |
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|
310 |
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case LICENCE_TAG_ISSUE: |
311 |
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licence_process_issue(s); |
312 |
|
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break; |
313 |
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|
314 |
matthewc |
39 |
case LICENCE_TAG_REISSUE: |
315 |
|
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break; |
316 |
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|
317 |
matty |
10 |
case LICENCE_TAG_RESULT: |
318 |
|
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break; |
319 |
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|
320 |
|
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default: |
321 |
matty |
30 |
unimpl("licence tag 0x%x\n", tag); |
322 |
matty |
10 |
} |
323 |
|
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} |