Laxmikant Rashinkar
10 years ago
commit
56e43c4a38
@ -1,3 +1,3 @@
|
||||
[submodule "librfxcodec"]
|
||||
path = librfxcodec
|
||||
url = git://github.com/neutrinolabs/librfxcodec.git
|
||||
url = git://github.com/neutrinolabs/librfxcodec
|
||||
|
||||
@ -0,0 +1,435 @@
|
||||
/**
|
||||
* 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 "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;
|
||||
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;
|
||||
}
|
||||
|
||||
return self;
|
||||
}
|
||||
/*****************************************************************************/
|
||||
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;
|
||||
|
||||
/**
|
||||
* 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;
|
||||
|
||||
/**
|
||||
* 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_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_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_free(self);
|
||||
}
|
||||
}
|
||||
/*****************************************************************************/
|
||||
int APP_CC
|
||||
xrdp_tls_read(struct xrdp_tls *tls, unsigned 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;
|
||||
}
|
||||
|
||||
return status;
|
||||
}
|
||||
/*****************************************************************************/
|
||||
int APP_CC
|
||||
xrdp_tls_write(struct xrdp_tls *tls, unsigned 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;
|
||||
}
|
||||
/*****************************************************************************/
|
||||
int APP_CC
|
||||
xrdp_tls_force_read_s(struct trans *self, struct stream *in_s, int size)
|
||||
{
|
||||
int rcvd;
|
||||
|
||||
if (self->status != TRANS_STATUS_UP)
|
||||
{
|
||||
return 1;
|
||||
}
|
||||
|
||||
while (size > 0)
|
||||
{
|
||||
/* make sure stream has room */
|
||||
if ((in_s->end + size) > (in_s->data + in_s->size))
|
||||
{
|
||||
return 1;
|
||||
}
|
||||
|
||||
rcvd = xrdp_tls_read(self->tls, in_s->end, size);
|
||||
|
||||
if (rcvd == -1)
|
||||
{
|
||||
if (g_tcp_last_error_would_block(self->sck))
|
||||
{
|
||||
if (!g_tcp_can_recv(self->sck, 100))
|
||||
{
|
||||
/* check for term here */
|
||||
if (self->is_term != 0)
|
||||
{
|
||||
if (self->is_term())
|
||||
{
|
||||
/* term */
|
||||
self->status = TRANS_STATUS_DOWN;
|
||||
return 1;
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
else
|
||||
{
|
||||
/* error */
|
||||
self->status = TRANS_STATUS_DOWN;
|
||||
return 1;
|
||||
}
|
||||
}
|
||||
else if (rcvd == 0)
|
||||
{
|
||||
/* error */
|
||||
self->status = TRANS_STATUS_DOWN;
|
||||
return 1;
|
||||
}
|
||||
else
|
||||
{
|
||||
in_s->end += rcvd;
|
||||
size -= rcvd;
|
||||
}
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/*****************************************************************************/
|
||||
int APP_CC
|
||||
xrdp_tls_force_write_s(struct trans *self, struct stream *out_s)
|
||||
{
|
||||
int size;
|
||||
int total;
|
||||
int sent;
|
||||
|
||||
if (self->status != TRANS_STATUS_UP)
|
||||
{
|
||||
return 1;
|
||||
}
|
||||
|
||||
size = (int) (out_s->end - out_s->data);
|
||||
total = 0;
|
||||
|
||||
if (xrdp_tls_send_waiting(self, 1) != 0)
|
||||
{
|
||||
self->status = TRANS_STATUS_DOWN;
|
||||
return 1;
|
||||
}
|
||||
|
||||
while (total < size)
|
||||
{
|
||||
sent = xrdp_tls_write(self->tls, out_s->data + total, size - total);
|
||||
|
||||
if (sent == -1)
|
||||
{
|
||||
if (g_tcp_last_error_would_block(self->sck))
|
||||
{
|
||||
if (!g_tcp_can_send(self->sck, 100))
|
||||
{
|
||||
/* check for term here */
|
||||
if (self->is_term != 0)
|
||||
{
|
||||
if (self->is_term())
|
||||
{
|
||||
/* term */
|
||||
self->status = TRANS_STATUS_DOWN;
|
||||
return 1;
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
else
|
||||
{
|
||||
/* error */
|
||||
self->status = TRANS_STATUS_DOWN;
|
||||
return 1;
|
||||
}
|
||||
}
|
||||
else if (sent == 0)
|
||||
{
|
||||
/* error */
|
||||
self->status = TRANS_STATUS_DOWN;
|
||||
return 1;
|
||||
}
|
||||
else
|
||||
{
|
||||
total = total + sent;
|
||||
}
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
/*****************************************************************************/
|
||||
int APP_CC
|
||||
xrdp_tls_send_waiting(struct trans *self, int block)
|
||||
{
|
||||
struct stream *temp_s;
|
||||
int bytes;
|
||||
int sent;
|
||||
int timeout;
|
||||
int cont;
|
||||
|
||||
timeout = block ? 100 : 0;
|
||||
cont = 1;
|
||||
while (cont)
|
||||
{
|
||||
if (self->wait_s != 0)
|
||||
{
|
||||
temp_s = self->wait_s;
|
||||
if (g_tcp_can_send(self->sck, timeout))
|
||||
{
|
||||
bytes = (int) (temp_s->end - temp_s->p);
|
||||
sent = xrdp_tls_write(self->tls, temp_s->p, bytes);
|
||||
if (sent > 0)
|
||||
{
|
||||
temp_s->p += sent;
|
||||
if (temp_s->p >= temp_s->end)
|
||||
{
|
||||
self->wait_s = (struct stream *) (temp_s->next_packet);
|
||||
free_stream(temp_s);
|
||||
}
|
||||
}
|
||||
else if (sent == 0)
|
||||
{
|
||||
return 1;
|
||||
}
|
||||
else
|
||||
{
|
||||
if (!g_tcp_last_error_would_block(self->sck))
|
||||
{
|
||||
return 1;
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
else
|
||||
{
|
||||
break;
|
||||
}
|
||||
cont = block;
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
Loading…
Reference in new issue