370 lines
12 KiB
C
370 lines
12 KiB
C
/**
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* xrdp: A Remote Desktop Protocol server.
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*
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* Copyright (C) Jay Sorg 2004-2012
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* licence
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*/
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#include "rdp.h"
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/*****************************************************************************/
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struct rdp_lic *APP_CC
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rdp_lic_create(struct rdp_sec *owner)
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{
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struct rdp_lic *self;
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self = (struct rdp_lic *)g_malloc(sizeof(struct rdp_lic), 1);
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self->sec_layer = owner;
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return self;
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}
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/*****************************************************************************/
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void APP_CC
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rdp_lic_delete(struct rdp_lic *self)
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{
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if (self == 0)
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{
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return;
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}
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g_free(self);
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}
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/*****************************************************************************/
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/* Generate a session key and RC4 keys, given client and server randoms */
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static void APP_CC
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rdp_lic_generate_keys(struct rdp_lic *self, char *client_random,
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char *server_random, char *pre_master_secret)
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{
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char master_secret[48];
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char key_block[48];
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/* Generate master secret and then key material */
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rdp_sec_hash_48(master_secret, pre_master_secret, client_random,
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server_random, 65);
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rdp_sec_hash_48(key_block, master_secret, server_random,
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client_random, 65);
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/* Store first 16 bytes of session key as MAC secret */
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g_memcpy(self->licence_sign_key, key_block, 16);
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/* Generate RC4 key from next 16 bytes */
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rdp_sec_hash_16(self->licence_key, key_block + 16, client_random,
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server_random);
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}
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/*****************************************************************************/
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static void APP_CC
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rdp_lic_generate_hwid(struct rdp_lic *self, char *hwid)
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{
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rdp_sec_buf_out_uint32(hwid, 2);
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g_strncpy(hwid + 4, self->sec_layer->rdp_layer->mod->hostname,
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LICENCE_HWID_SIZE - 4);
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}
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/*****************************************************************************/
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/* Present an existing licence to the server */
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static void APP_CC
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rdp_lic_present(struct rdp_lic *self, char *client_random, char *rsa_data,
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char *licence_data, int licence_size, char *hwid,
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char *signature)
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{
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int sec_flags;
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int length;
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struct stream *s;
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sec_flags = SEC_LICENCE_NEG;
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length = 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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make_stream(s);
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init_stream(s, 8192);
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rdp_sec_init(self->sec_layer, s, sec_flags);
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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_le(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, 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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rdp_sec_send(self->sec_layer, s, sec_flags);
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free_stream(s);
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}
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/*****************************************************************************/
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/* Send a licence request packet */
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static void APP_CC
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rdp_lic_send_request(struct rdp_lic *self, char *client_random,
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char *rsa_data, char *user, char *host)
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{
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int sec_flags;
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int userlen;
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int hostlen;
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int length;
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struct stream *s;
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sec_flags = SEC_LICENCE_NEG;
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userlen = g_strlen(user) + 1;
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hostlen = g_strlen(host) + 1;
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length = 128 + userlen + hostlen;
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make_stream(s);
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init_stream(s, 8192);
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rdp_sec_init(self->sec_layer, s, sec_flags);
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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_le(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, 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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rdp_sec_send(self->sec_layer, s, sec_flags);
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free_stream(s);
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}
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/*****************************************************************************/
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/* Process a licence demand packet */
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static void APP_CC
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rdp_lic_process_demand(struct rdp_lic *self, struct stream *s)
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{
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char null_data[SEC_MODULUS_SIZE];
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char *server_random;
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char signature[LICENCE_SIGNATURE_SIZE];
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char hwid[LICENCE_HWID_SIZE];
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char *licence_data;
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int licence_size;
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void *crypt_key;
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licence_data = 0;
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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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g_memset(null_data, 0, sizeof(null_data));
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rdp_lic_generate_keys(self, null_data, server_random, null_data);
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licence_size = 0; /* todo 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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rdp_lic_generate_hwid(self, hwid);
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rdp_sec_sign(signature, 16, self->licence_sign_key, 16,
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hwid, sizeof(hwid));
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/* Now encrypt the HWID */
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crypt_key = ssl_rc4_info_create();
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ssl_rc4_set_key(crypt_key, self->licence_key, 16);
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ssl_rc4_crypt(crypt_key, hwid, sizeof(hwid));
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ssl_rc4_info_delete(crypt_key);
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rdp_lic_present(self, null_data, null_data, licence_data,
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licence_size, hwid, signature);
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g_free(licence_data);
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return;
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}
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rdp_lic_send_request(self, null_data, null_data,
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self->sec_layer->rdp_layer->mod->username,
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self->sec_layer->rdp_layer->mod->hostname);
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}
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/*****************************************************************************/
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/* Send an authentication response packet */
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static void APP_CC
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rdp_lic_send_authresp(struct rdp_lic *self, char *token, char *crypt_hwid,
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char *signature)
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{
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int sec_flags;
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int length;
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struct stream *s;
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sec_flags = SEC_LICENCE_NEG;
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length = 58;
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make_stream(s);
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init_stream(s, 8192);
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rdp_sec_init(self->sec_layer, s, sec_flags);
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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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rdp_sec_send(self->sec_layer, s, sec_flags);
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free_stream(s);
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}
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/*****************************************************************************/
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/* Parse an authentication request packet */
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/* returns boolean */
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static int APP_CC
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rdp_lic_parse_authreq(struct rdp_lic *self, struct stream *s,
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char **token, char **signature)
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{
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int 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 0;
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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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/*****************************************************************************/
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/* Process an authentication request packet */
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static void APP_CC
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rdp_lic_process_authreq(struct rdp_lic *self, struct stream *s)
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{
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char *in_token;
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char *in_sig;
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char out_token[LICENCE_TOKEN_SIZE];
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char decrypt_token[LICENCE_TOKEN_SIZE];
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char hwid[LICENCE_HWID_SIZE];
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char crypt_hwid[LICENCE_HWID_SIZE];
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char sealed_buffer[LICENCE_TOKEN_SIZE + LICENCE_HWID_SIZE];
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char out_sig[LICENCE_SIGNATURE_SIZE];
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void *crypt_key;
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in_token = 0;
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in_sig = 0;
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/* Parse incoming packet and save the encrypted token */
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rdp_lic_parse_authreq(self, s, &in_token, &in_sig);
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g_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 = ssl_rc4_info_create();
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ssl_rc4_set_key(crypt_key, self->licence_key, 16);
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g_memcpy(decrypt_token, in_token, LICENCE_TOKEN_SIZE);
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ssl_rc4_crypt(crypt_key, decrypt_token, LICENCE_TOKEN_SIZE);
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/* Generate a signature for a buffer of token and HWID */
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rdp_lic_generate_hwid(self, hwid);
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g_memcpy(sealed_buffer, decrypt_token, LICENCE_TOKEN_SIZE);
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g_memcpy(sealed_buffer + LICENCE_TOKEN_SIZE, hwid, LICENCE_HWID_SIZE);
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rdp_sec_sign(out_sig, 16, self->licence_sign_key, 16, sealed_buffer,
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sizeof(sealed_buffer));
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/* Now encrypt the HWID */
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ssl_rc4_set_key(crypt_key, self->licence_key, 16);
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g_memcpy(crypt_hwid, hwid, LICENCE_HWID_SIZE);
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ssl_rc4_crypt(crypt_key, crypt_hwid, LICENCE_HWID_SIZE);
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rdp_lic_send_authresp(self, out_token, crypt_hwid, out_sig);
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ssl_rc4_info_delete(crypt_key);
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}
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/*****************************************************************************/
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/* Process an licence issue packet */
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static void APP_CC
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rdp_lic_process_issue(struct rdp_lic *self, struct stream *s)
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{
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void *crypt_key;
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int length;
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int 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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{
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return;
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}
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crypt_key = ssl_rc4_info_create();
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ssl_rc4_set_key(crypt_key, self->licence_key, 16);
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ssl_rc4_crypt(crypt_key, s->p, length);
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ssl_rc4_info_delete(crypt_key);
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in_uint16_le(s, check);
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if (check != 0)
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{
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return;
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}
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self->licence_issued = 1;
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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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{
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return;
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}
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}
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/* todo save_licence(s->p, length); */
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}
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/******************************************************************************/
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/* Process a licence packet */
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void APP_CC
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rdp_lic_process(struct rdp_lic *self, struct stream *s)
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{
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int 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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rdp_lic_process_demand(self, s);
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break;
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case LICENCE_TAG_AUTHREQ:
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rdp_lic_process_authreq(self, s);
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break;
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case LICENCE_TAG_ISSUE:
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rdp_lic_process_issue(self, 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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break;
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/* todo unimpl("licence tag 0x%x\n", tag); */
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}
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}
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