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329 lines
8.7 KiB
C
329 lines
8.7 KiB
C
/* -*- c-basic-offset: 8 -*-
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rdesktop: A Remote Desktop Protocol client.
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RDP licensing negotiation
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Copyright (C) Matthew Chapman 1999-2005
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along
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with this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "rdesktop.h"
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#include <openssl/rc4.h> // TODO: remove dependency on OpenSSL
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/* Generate a session key and RC4 keys, given client and server randoms */
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static void
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licence_generate_keys(RDPCLIENT * This, uint8 * client_random, uint8 * server_random, uint8 * pre_master_secret)
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{
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uint8 master_secret[48];
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uint8 key_block[48];
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/* Generate master secret and then key material */
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sec_hash_48(master_secret, pre_master_secret, client_random, server_random, 'A');
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sec_hash_48(key_block, master_secret, server_random, client_random, 'A');
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/* Store first 16 bytes of session key as MAC secret */
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memcpy(This->licence.sign_key, key_block, 16);
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/* Generate RC4 key from next 16 bytes */
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sec_hash_16(This->licence.key, &key_block[16], client_random, server_random);
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}
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static void
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licence_generate_hwid(RDPCLIENT * This, uint8 * hwid)
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{
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buf_out_uint32(hwid, 2);
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strncpy((char *) (hwid + 4), This->licence_hostname, LICENCE_HWID_SIZE - 4);
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}
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/* Present an existing licence to the server */
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static BOOL
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licence_present(RDPCLIENT * This, uint8 * client_random, uint8 * rsa_data,
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uint8 * licence_data, int licence_size, uint8 * hwid, uint8 * signature)
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{
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uint32 sec_flags = SEC_LICENCE_NEG;
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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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STREAM s;
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s = sec_init(This, sec_flags, length + 4);
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if(s == NULL)
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return False;
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out_uint8(s, LICENCE_TAG_PRESENT);
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out_uint8(s, 2); /* version */
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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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return sec_send(This, s, sec_flags);
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}
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/* Send a licence request packet */
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static BOOL
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licence_send_request(RDPCLIENT * This, uint8 * client_random, uint8 * rsa_data, char *user, char *host)
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{
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uint32 sec_flags = SEC_LICENCE_NEG;
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uint16 userlen = (uint16)strlen(user) + 1;
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uint16 hostlen = (uint16)strlen(host) + 1;
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uint16 length = 128 + userlen + hostlen;
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STREAM s;
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s = sec_init(This, sec_flags, length + 2);
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if(s == NULL)
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return False;
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out_uint8(s, LICENCE_TAG_REQUEST);
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out_uint8(s, 2); /* version */
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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, 0xff01);
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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, LICENCE_TAG_USER);
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out_uint16_le(s, userlen);
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out_uint8p(s, user, userlen);
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out_uint16_le(s, LICENCE_TAG_HOST);
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out_uint16_le(s, hostlen);
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out_uint8p(s, host, hostlen);
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s_mark_end(s);
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return sec_send(This, s, sec_flags);
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}
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/* Process a licence demand packet */
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static BOOL
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licence_process_demand(RDPCLIENT * This, STREAM s)
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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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uint8 signature[LICENCE_SIGNATURE_SIZE];
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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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/* 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(This, null_data, server_random, null_data);
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licence_size = load_licence(This, &licence_data);
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if (licence_size > 0)
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{
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/* Generate a signature for the HWID buffer */
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licence_generate_hwid(This, hwid);
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sec_sign(signature, 16, This->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, This->licence.key);
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RC4(&crypt_key, sizeof(hwid), hwid, hwid);
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if(!licence_present(This, null_data, null_data, licence_data, licence_size, hwid, signature))
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return False;
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free(licence_data);
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return True;
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}
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return licence_send_request(This, null_data, null_data, This->licence_username, This->licence_hostname);
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}
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/* Send an authentication response packet */
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static BOOL
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licence_send_authresp(RDPCLIENT * This, uint8 * token, uint8 * crypt_hwid, uint8 * signature)
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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(This, sec_flags, length + 2);
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if(s == NULL)
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return False;
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out_uint8(s, LICENCE_TAG_AUTHRESP);
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out_uint8(s, 2); /* version */
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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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return sec_send(This, s, sec_flags);
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}
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/* Parse an authentication request packet */
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static BOOL
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licence_parse_authreq(STREAM s, uint8 ** token, uint8 ** signature)
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{
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uint16 tokenlen;
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in_uint8s(s, 6); /* unknown: f8 3d 15 00 04 f6 */
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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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error("token len %d\n", tokenlen);
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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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static void
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licence_process_authreq(RDPCLIENT * This, STREAM s)
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{
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uint8 *in_token, *in_sig;
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uint8 out_token[LICENCE_TOKEN_SIZE], decrypt_token[LICENCE_TOKEN_SIZE];
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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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RC4_set_key(&crypt_key, 16, This->licence.key);
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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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licence_generate_hwid(This, hwid);
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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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sec_sign(out_sig, 16, This->licence.sign_key, 16, sealed_buffer, sizeof(sealed_buffer));
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/* Now encrypt the HWID */
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RC4_set_key(&crypt_key, 16, This->licence.key);
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RC4(&crypt_key, LICENCE_HWID_SIZE, hwid, crypt_hwid);
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licence_send_authresp(This, out_token, crypt_hwid, out_sig);
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}
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/* Process an licence issue packet */
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static void
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licence_process_issue(RDPCLIENT * This, STREAM s)
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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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int i;
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in_uint8s(s, 2); /* 3d 45 - unknown */
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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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RC4_set_key(&crypt_key, 16, This->licence.key);
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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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This->licence_issued = True;
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in_uint8s(s, 2); /* pad */
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/* advance to fourth string */
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length = 0;
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for (i = 0; i < 4; i++)
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{
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in_uint8s(s, length);
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in_uint32_le(s, length);
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if (!s_check_rem(s, length))
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return;
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}
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This->licence_issued = True;
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save_licence(This, s->p, length);
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}
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/* Process a licence packet */
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void
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licence_process(RDPCLIENT * This, STREAM s)
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{
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uint8 tag;
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in_uint8(s, tag);
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in_uint8s(s, 3); /* version, length */
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switch (tag)
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{
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case LICENCE_TAG_DEMAND:
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licence_process_demand(This, s);
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break;
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case LICENCE_TAG_AUTHREQ:
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licence_process_authreq(This, s);
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break;
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case LICENCE_TAG_ISSUE:
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licence_process_issue(This, s);
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break;
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case LICENCE_TAG_REISSUE:
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case LICENCE_TAG_RESULT:
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break;
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default:
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unimpl("licence tag 0x%x\n", tag);
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}
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}
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