You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
294 lines
7.3 KiB
294 lines
7.3 KiB
/**
|
|
* xrdp: A Remote Desktop Protocol server.
|
|
*
|
|
* Copyright (C) Idan Freiberg 2013-2014
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*
|
|
* transport layer security
|
|
*/
|
|
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <openssl/ssl.h>
|
|
|
|
#include "os_calls.h"
|
|
#include "trans.h"
|
|
#include "ssl_calls.h"
|
|
|
|
|
|
/*****************************************************************************/
|
|
struct xrdp_tls *
|
|
APP_CC
|
|
xrdp_tls_create(struct trans *trans, const char *key, const char *cert)
|
|
{
|
|
struct xrdp_tls *self;
|
|
int pid;
|
|
char buf[1024];
|
|
|
|
self = (struct xrdp_tls *) g_malloc(sizeof(struct xrdp_tls), 1);
|
|
if (self != NULL)
|
|
{
|
|
self->trans = trans;
|
|
self->cert = (char *) cert;
|
|
self->key = (char *) key;
|
|
pid = g_getpid();
|
|
g_snprintf(buf, 1024, "xrdp_%8.8x_tls_rwo", pid);
|
|
self->rwo = g_create_wait_obj(buf);
|
|
}
|
|
|
|
return self;
|
|
}
|
|
|
|
/*****************************************************************************/
|
|
int APP_CC
|
|
xrdp_tls_print_error(char *func, SSL *connection, int value)
|
|
{
|
|
switch (SSL_get_error(connection, value))
|
|
{
|
|
case SSL_ERROR_ZERO_RETURN:
|
|
g_writeln("xrdp_tls_print_error: %s: Server closed TLS connection",
|
|
func);
|
|
return 1;
|
|
|
|
case SSL_ERROR_WANT_READ:
|
|
g_writeln("xrdp_tls_print_error: SSL_ERROR_WANT_READ");
|
|
return 0;
|
|
|
|
case SSL_ERROR_WANT_WRITE:
|
|
g_writeln("xrdp_tls_print_error: SSL_ERROR_WANT_WRITE");
|
|
return 0;
|
|
|
|
case SSL_ERROR_SYSCALL:
|
|
g_writeln("xrdp_tls_print_error: %s: I/O error", func);
|
|
return 1;
|
|
|
|
case SSL_ERROR_SSL:
|
|
g_writeln("xrdp_tls_print_error: %s: Failure in SSL library (protocol error?)",
|
|
func);
|
|
return 1;
|
|
|
|
default:
|
|
g_writeln("xrdp_tls_print_error: %s: Unknown error", func);
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
/*****************************************************************************/
|
|
int APP_CC
|
|
xrdp_tls_accept(struct xrdp_tls *self)
|
|
{
|
|
int connection_status;
|
|
long options = 0;
|
|
|
|
/**
|
|
* SSL_OP_NO_SSLv2:
|
|
*
|
|
* We only want SSLv3 and TLSv1, so disable SSLv2.
|
|
* SSLv3 is used by, eg. Microsoft RDC for Mac OS X.
|
|
*/
|
|
options |= SSL_OP_NO_SSLv2;
|
|
|
|
#if defined(SSL_OP_NO_COMPRESSION)
|
|
/**
|
|
* SSL_OP_NO_COMPRESSION:
|
|
*
|
|
* The Microsoft RDP server does not advertise support
|
|
* for TLS compression, but alternative servers may support it.
|
|
* This was observed between early versions of the FreeRDP server
|
|
* and the FreeRDP client, and caused major performance issues,
|
|
* which is why we're disabling it.
|
|
*/
|
|
options |= SSL_OP_NO_COMPRESSION;
|
|
#endif
|
|
|
|
/**
|
|
* SSL_OP_TLS_BLOCK_PADDING_BUG:
|
|
*
|
|
* The Microsoft RDP server does *not* support TLS padding.
|
|
* It absolutely needs to be disabled otherwise it won't work.
|
|
*/
|
|
options |= SSL_OP_TLS_BLOCK_PADDING_BUG;
|
|
|
|
/**
|
|
* SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS:
|
|
*
|
|
* Just like TLS padding, the Microsoft RDP server does not
|
|
* support empty fragments. This needs to be disabled.
|
|
*/
|
|
options |= SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS;
|
|
|
|
self->ctx = SSL_CTX_new(SSLv23_server_method());
|
|
/* set context options */
|
|
SSL_CTX_set_mode(self->ctx,
|
|
SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER |
|
|
SSL_MODE_ENABLE_PARTIAL_WRITE);
|
|
SSL_CTX_set_options(self->ctx, options);
|
|
SSL_CTX_set_read_ahead(self->ctx, 1);
|
|
|
|
if (self->ctx == NULL)
|
|
{
|
|
g_writeln("xrdp_tls_accept: SSL_CTX_new failed");
|
|
return 1;
|
|
}
|
|
|
|
if (SSL_CTX_use_RSAPrivateKey_file(self->ctx, self->key, SSL_FILETYPE_PEM)
|
|
<= 0)
|
|
{
|
|
g_writeln("xrdp_tls_accept: SSL_CTX_use_RSAPrivateKey_file failed");
|
|
return 1;
|
|
}
|
|
|
|
self->ssl = SSL_new(self->ctx);
|
|
|
|
if (self->ssl == NULL)
|
|
{
|
|
g_writeln("xrdp_tls_accept: SSL_new failed");
|
|
return 1;
|
|
}
|
|
|
|
if (SSL_use_certificate_file(self->ssl, self->cert, SSL_FILETYPE_PEM) <= 0)
|
|
{
|
|
g_writeln("xrdp_tls_accept: SSL_use_certificate_file failed");
|
|
return 1;
|
|
}
|
|
|
|
if (SSL_set_fd(self->ssl, self->trans->sck) < 1)
|
|
{
|
|
g_writeln("xrdp_tls_accept: SSL_set_fd failed");
|
|
return 1;
|
|
}
|
|
|
|
connection_status = SSL_accept(self->ssl);
|
|
|
|
if (connection_status <= 0)
|
|
{
|
|
if (xrdp_tls_print_error("SSL_accept", self->ssl, connection_status))
|
|
{
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
g_writeln("xrdp_tls_accept: TLS connection accepted");
|
|
|
|
return 0;
|
|
}
|
|
/*****************************************************************************/
|
|
int APP_CC
|
|
xrdp_tls_disconnect(struct xrdp_tls *self)
|
|
{
|
|
int status = SSL_shutdown(self->ssl);
|
|
while (status != 1)
|
|
{
|
|
status = SSL_shutdown(self->ssl);
|
|
|
|
if (status <= 0)
|
|
{
|
|
if (xrdp_tls_print_error("SSL_shutdown", self->ssl, status))
|
|
{
|
|
return 1;
|
|
}
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
/*****************************************************************************/
|
|
void APP_CC
|
|
xrdp_tls_delete(struct xrdp_tls *self)
|
|
{
|
|
if (self != NULL)
|
|
{
|
|
if (self->ssl)
|
|
SSL_free(self->ssl);
|
|
|
|
if (self->ctx)
|
|
SSL_CTX_free(self->ctx);
|
|
|
|
g_delete_wait_obj(self->rwo);
|
|
|
|
g_free(self);
|
|
}
|
|
}
|
|
/*****************************************************************************/
|
|
int APP_CC
|
|
xrdp_tls_read(struct xrdp_tls *tls, char *data, int length)
|
|
{
|
|
int status;
|
|
|
|
status = SSL_read(tls->ssl, data, length);
|
|
|
|
switch (SSL_get_error(tls->ssl, status))
|
|
{
|
|
case SSL_ERROR_NONE:
|
|
break;
|
|
|
|
case SSL_ERROR_WANT_READ:
|
|
case SSL_ERROR_WANT_WRITE:
|
|
status = 0;
|
|
break;
|
|
|
|
default:
|
|
xrdp_tls_print_error("SSL_read", tls->ssl, status);
|
|
status = -1;
|
|
break;
|
|
}
|
|
|
|
if (SSL_pending(tls->ssl) > 0)
|
|
{
|
|
g_set_wait_obj(tls->rwo);
|
|
}
|
|
|
|
return status;
|
|
}
|
|
/*****************************************************************************/
|
|
int APP_CC
|
|
xrdp_tls_write(struct xrdp_tls *tls, const char *data, int length)
|
|
{
|
|
int status;
|
|
|
|
status = SSL_write(tls->ssl, data, length);
|
|
|
|
switch (SSL_get_error(tls->ssl, status))
|
|
{
|
|
case SSL_ERROR_NONE:
|
|
break;
|
|
|
|
case SSL_ERROR_WANT_READ:
|
|
case SSL_ERROR_WANT_WRITE:
|
|
status = 0;
|
|
break;
|
|
|
|
default:
|
|
xrdp_tls_print_error("SSL_write", tls->ssl, status);
|
|
status = -1;
|
|
break;
|
|
}
|
|
|
|
return status;
|
|
}
|
|
/*****************************************************************************/
|
|
/* returns boolean */
|
|
int APP_CC
|
|
xrdp_tls_can_recv(struct xrdp_tls *tls, int sck, int millis)
|
|
{
|
|
if (SSL_pending(tls->ssl) > 0)
|
|
{
|
|
return 1;
|
|
}
|
|
g_reset_wait_obj(tls->rwo);
|
|
return g_tcp_can_recv(sck, millis);
|
|
}
|
|
|