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413 lines
11 KiB
C
413 lines
11 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 <matthewc.unsw.edu.au> 1999-2008
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Copyright (C) Thomas Uhle <thomas.uhle@mailbox.tu-dresden.de> 2011
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Copyright (C) Henrik Andersson <henrik.andersson@cendio.com> 2014
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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 3 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
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "precomp.h"
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void *
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rdssl_rc4_info_create(void);
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void
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rdssl_rc4_info_delete(void * rc4_info);
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void
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rdssl_rc4_set_key(void * rc4_info, char * key, int len);
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void
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rdssl_rc4_crypt(void * rc4_info, char * in_data, char * out_data, int len);
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int
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rdssl_mod_exp(char* out, int out_len, char* in, int in_len,
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char* mod, int mod_len, char* exp, int exp_len);
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extern char g_username[256];
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extern char g_hostname[256];
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extern RDP_VERSION g_rdp_version;
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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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RD_BOOL g_licence_issued = False;
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RD_BOOL g_licence_error_result = False;
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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(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(g_licence_sign_key, key_block, 16);
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/* Generate RC4 key from next 16 bytes */
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sec_hash_16(g_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(uint8 * hwid)
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{
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buf_out_uint32(hwid, 2);
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strncpy((char *) (hwid + 4), g_hostname, LICENCE_HWID_SIZE - 4);
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}
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/* Send a lincece info packet to server */
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static void
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licence_info(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_LICENSE_PKT;
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uint16 length =
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24 + 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(sec_flags, length + 2);
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out_uint8(s, LICENCE_TAG_LICENCE_INFO);
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out_uint8(s, ((g_rdp_version >= RDP_V5) ? 3 : 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_le(s, 2);
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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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/* Send a new licence request packet */
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static void
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licence_send_new_licence_request(uint8 * client_random, uint8 * rsa_data, char *user, char *host)
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{
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uint32 sec_flags = SEC_LICENSE_PKT;
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uint16 userlen = strlen(user) + 1;
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uint16 hostlen = strlen(host) + 1;
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uint16 length =
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24 + SEC_RANDOM_SIZE + SEC_MODULUS_SIZE + SEC_PADDING_SIZE + userlen + hostlen;
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STREAM s;
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s = sec_init(sec_flags, length + 2);
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out_uint8(s, LICENCE_TAG_NEW_LICENCE_REQUEST);
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out_uint8(s, ((g_rdp_version >= RDP_V5) ? 3 : 2)); /* version */
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out_uint16_le(s, length);
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out_uint32_le(s, 1); // KEY_EXCHANGE_ALG_RSA
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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_le(s, 2);
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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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/* Username LICENSE_BINARY_BLOB */
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out_uint16_le(s, BB_CLIENT_USER_NAME_BLOB);
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out_uint16_le(s, userlen);
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out_uint8p(s, user, userlen);
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/* Machinename LICENSE_BINARY_BLOB */
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out_uint16_le(s, BB_CLIENT_MACHINE_NAME_BLOB);
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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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sec_send(s, sec_flags);
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}
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/* Process a licence request packet */
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static void
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licence_process_request(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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void * 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(null_data, server_random, null_data);
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licence_size = load_licence(&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(hwid);
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sec_sign(signature, 16, g_licence_sign_key, 16, hwid, sizeof(hwid));
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/* Now encrypt the HWID */
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crypt_key = rdssl_rc4_info_create();
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rdssl_rc4_set_key(crypt_key, (char *)g_licence_key, 16);
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rdssl_rc4_crypt(crypt_key, (char *)hwid, (char *)hwid, sizeof(hwid));
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rdssl_rc4_info_delete(crypt_key);
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#if WITH_DEBUG
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DEBUG(("Sending licensing PDU (message type 0x%02x)\n", LICENCE_TAG_LICENCE_INFO));
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#endif
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licence_info(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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#if WITH_DEBUG
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DEBUG(("Sending licensing PDU (message type 0x%02x)\n", LICENCE_TAG_NEW_LICENCE_REQUEST));
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#endif
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licence_send_new_licence_request(null_data, null_data, g_username, g_hostname);
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}
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/* Send a platform challenge response packet */
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static void
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licence_send_platform_challenge_response(uint8 * token, uint8 * crypt_hwid, uint8 * signature)
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{
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uint32 sec_flags = SEC_LICENSE_PKT;
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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_uint8(s, LICENCE_TAG_PLATFORM_CHALLANGE_RESPONSE);
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out_uint8(s, ((g_rdp_version >= RDP_V5) ? 3 : 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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sec_send(s, sec_flags);
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}
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/* Parse a platform challenge request packet */
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static RD_BOOL
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licence_parse_platform_challenge(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 a platform challenge packet */
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static void
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licence_process_platform_challenge(STREAM s)
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{
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uint8 *in_token = NULL, *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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void * crypt_key;
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/* Parse incoming packet and save the encrypted token */
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licence_parse_platform_challenge(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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crypt_key = rdssl_rc4_info_create();
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rdssl_rc4_set_key(crypt_key, (char *)g_licence_key, 16);
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rdssl_rc4_crypt(crypt_key, (char *)in_token, (char *)decrypt_token, LICENCE_TOKEN_SIZE);
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rdssl_rc4_info_delete(crypt_key);
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/* Generate a signature for a buffer of token and HWID */
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licence_generate_hwid(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, g_licence_sign_key, 16, sealed_buffer, sizeof(sealed_buffer));
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/* Now encrypt the HWID */
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crypt_key = rdssl_rc4_info_create();
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rdssl_rc4_set_key(crypt_key, (char *)g_licence_key, 16);
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rdssl_rc4_crypt(crypt_key, (char *)hwid, (char *)crypt_hwid, LICENCE_HWID_SIZE);
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licence_send_platform_challenge_response(out_token, crypt_hwid, out_sig);
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}
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/* Process a new licence packet */
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static void
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licence_process_new_license(STREAM s)
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{
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void * crypt_key;
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uint32 length;
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int i;
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in_uint8s(s, 2); // Skip license binary blob type
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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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crypt_key = rdssl_rc4_info_create();
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rdssl_rc4_set_key(crypt_key, (char *)g_licence_key, 16);
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rdssl_rc4_crypt(crypt_key, (char *)s->p, (char *)s->p, length);
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rdssl_rc4_info_delete(crypt_key);
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/* Parse NEW_LICENSE_INFO block */
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in_uint8s(s, 4); // skip dwVersion
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/* Skip strings, Scope, CompanyName and ProductId to get
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to the LicenseInfo which we store in license blob. */
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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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g_licence_issued = True;
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save_licence(s->p, length);
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}
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/* process a licence error alert packet */
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void
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licence_process_error_alert(STREAM s)
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{
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uint32 error_code;
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uint32 state_transition;
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uint32 error_info;
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in_uint32(s, error_code);
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in_uint32(s, state_transition);
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in_uint32(s, error_info);
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/* There is a special case in the error alert handling, when licensing is all good
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and the server is not sending a license to client, a "Server License Error PDU -
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Valid Client" packet is sent which means, every thing is ok.
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Therefor we should flag that everything is ok with license here.
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*/
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if (error_code == 0x07)
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{
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g_licence_issued = True;
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return;
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}
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/* handle error codes, for now, just report them */
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switch (error_code)
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{
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case 0x6: // ERR_NO_LICENSE_SERVER
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warning("License error alert from server: No license server\n");
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break;
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case 0x8: // ERR_INVALID_CLIENT
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warning("License error alert from server: Invalid client\n");
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break;
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case 0x4: // ERR_INVALID_SCOPE
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case 0xb: // ERR_INVALID_PRODUCTID
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case 0xc: // ERR_INVALID_MESSAGE_LENGTH
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default:
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warning("License error alert from server: code %u, state transition %u\n",
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error_code, state_transition);
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break;
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}
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/* handle error codes, for now, just report them */
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switch (error_info)
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{
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default:
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break;
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}
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g_licence_error_result = True;
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}
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/* Process a licence packet */
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void
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licence_process(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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#if WITH_DEBUG
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DEBUG(("Received licensing PDU (message type 0x%02x)\n", tag));
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#endif
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switch (tag)
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{
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case LICENCE_TAG_REQUEST:
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licence_process_request(s);
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break;
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case LICENCE_TAG_PLATFORM_CHALLANGE:
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licence_process_platform_challenge(s);
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break;
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case LICENCE_TAG_NEW_LICENCE:
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case LICENCE_TAG_UPGRADE_LICENCE:
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/* we can handle new and upgrades of licences the same way. */
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licence_process_new_license(s);
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break;
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case LICENCE_TAG_ERROR_ALERT:
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licence_process_error_alert(s);
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break;
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default:
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unimpl("licence tag 0x%02x\n", tag);
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}
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}
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