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423 lines
10 KiB
423 lines
10 KiB
/**
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* xrdp: A Remote Desktop Protocol server.
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*
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* Copyright (C) Idan Freiberg 2013-2014
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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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* transport layer security
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*/
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#include "trans.h"
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#include "ssl_calls.h"
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/*****************************************************************************/
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struct xrdp_tls *APP_CC
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xrdp_tls_create(struct trans *trans, const char *key, const char *cert)
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{
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struct xrdp_tls *self;
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self = (struct xrdp_tls *) g_malloc(sizeof(struct xrdp_tls), 1);
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if (self != NULL)
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{
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self->trans = trans;
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self->cert = (char *) cert;
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self->key = (char *) key;
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}
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return self;
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}
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/*****************************************************************************/
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int APP_CC
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xrdp_tls_accept(struct xrdp_tls *self)
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{
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int connection_status;
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long options = 0;
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/**
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* SSL_OP_NO_SSLv2:
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*
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* We only want SSLv3 and TLSv1, so disable SSLv2.
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* SSLv3 is used by, eg. Microsoft RDC for Mac OS X.
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*/
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options |= SSL_OP_NO_SSLv2;
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/**
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* SSL_OP_NO_COMPRESSION:
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*
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* The Microsoft RDP server does not advertise support
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* for TLS compression, but alternative servers may support it.
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* This was observed between early versions of the FreeRDP server
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* and the FreeRDP client, and caused major performance issues,
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* which is why we're disabling it.
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*/
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options |= SSL_OP_NO_COMPRESSION;
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/**
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* SSL_OP_TLS_BLOCK_PADDING_BUG:
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*
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* The Microsoft RDP server does *not* support TLS padding.
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* It absolutely needs to be disabled otherwise it won't work.
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*/
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options |= SSL_OP_TLS_BLOCK_PADDING_BUG;
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/**
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* SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS:
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*
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* Just like TLS padding, the Microsoft RDP server does not
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* support empty fragments. This needs to be disabled.
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*/
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options |= SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS;
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self->ctx = SSL_CTX_new(SSLv23_server_method());
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/* set context options */
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SSL_CTX_set_mode(self->ctx, SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER | SSL_MODE_ENABLE_PARTIAL_WRITE);
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SSL_CTX_set_options(self->ctx, options);
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SSL_CTX_set_read_ahead(self->ctx, 1);
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if (self->ctx == NULL) {
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g_writeln("xrdp_tls_accept: SSL_CTX_new failed");
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return 1;
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}
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if (SSL_CTX_use_RSAPrivateKey_file(self->ctx, self->key, SSL_FILETYPE_PEM)
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<= 0) {
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g_writeln("xrdp_tls_accept: SSL_CTX_use_RSAPrivateKey_file failed");
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return 1;
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}
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self->ssl = SSL_new(self->ctx);
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if (self->ssl == NULL) {
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g_writeln("xrdp_tls_accept: SSL_new failed");
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return 1;
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}
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if (SSL_use_certificate_file(self->ssl, self->cert, SSL_FILETYPE_PEM) <= 0) {
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g_writeln("xrdp_tls_accept: SSL_use_certificate_file failed");
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return 1;
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}
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if (SSL_set_fd(self->ssl, self->trans->sck) < 1) {
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g_writeln("xrdp_tls_accept: SSL_set_fd failed");
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return 1;
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}
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connection_status = SSL_accept(self->ssl);
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if (connection_status <= 0) {
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if (xrdp_tls_print_error("SSL_accept", self->ssl, connection_status))
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{
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return 1;
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}
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}
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g_writeln("xrdp_tls_accept: TLS connection accepted");
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return 0;
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}
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/*****************************************************************************/
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int APP_CC
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xrdp_tls_print_error(char *func, SSL *connection, int value)
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{
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switch (SSL_get_error(connection, value))
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{
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case SSL_ERROR_ZERO_RETURN:
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g_writeln("xrdp_tls_print_error: %s: Server closed TLS connection", func);
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return 1;
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case SSL_ERROR_WANT_READ:
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g_writeln("xrdp_tls_print_error: SSL_ERROR_WANT_READ");
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return 0;
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case SSL_ERROR_WANT_WRITE:
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g_writeln("xrdp_tls_print_error: SSL_ERROR_WANT_WRITE");
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return 0;
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case SSL_ERROR_SYSCALL:
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g_writeln("xrdp_tls_print_error: %s: I/O error", func);
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return 1;
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case SSL_ERROR_SSL:
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g_writeln("xrdp_tls_print_error: %s: Failure in SSL library (protocol error?)", func);
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return 1;
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default:
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g_writeln("xrdp_tls_print_error: %s: Unknown error", func);
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return 1;
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}
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}
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/*****************************************************************************/
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int APP_CC
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xrdp_tls_disconnect(struct xrdp_tls *self)
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{
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int status = SSL_shutdown(self->ssl);
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while (status != 1)
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{
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status = SSL_shutdown(self->ssl);
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if (status <= 0) {
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if (xrdp_tls_print_error("SSL_shutdown", self->ssl, status))
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{
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return 1;
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}
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}
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}
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return 0;
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}
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/*****************************************************************************/
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void APP_CC
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xrdp_tls_delete(struct xrdp_tls *self)
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{
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if (self != NULL)
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{
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if (self->ssl)
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SSL_free(self->ssl);
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if (self->ctx)
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SSL_CTX_free(self->ctx);
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g_free(self);
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}
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}
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/*****************************************************************************/
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int APP_CC
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xrdp_tls_read(struct xrdp_tls *tls, unsigned char *data, int length)
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{
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int status;
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status = SSL_read(tls->ssl, data, length);
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switch (SSL_get_error(tls->ssl, status))
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{
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case SSL_ERROR_NONE:
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break;
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case SSL_ERROR_WANT_READ:
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case SSL_ERROR_WANT_WRITE:
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status = 0;
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break;
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default:
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xrdp_tls_print_error("SSL_read", tls->ssl, status);
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status = -1;
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break;
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}
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return status;
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}
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/*****************************************************************************/
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int APP_CC
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xrdp_tls_write(struct xrdp_tls *tls, unsigned char *data, int length)
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{
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int status;
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status = SSL_write(tls->ssl, data, length);
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switch (SSL_get_error(tls->ssl, status))
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{
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case SSL_ERROR_NONE:
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break;
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case SSL_ERROR_WANT_READ:
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case SSL_ERROR_WANT_WRITE:
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status = 0;
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break;
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default:
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xrdp_tls_print_error("SSL_write", tls->ssl, status);
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status = -1;
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break;
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}
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return status;
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}
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/*****************************************************************************/
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int APP_CC
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xrdp_tls_force_read_s(struct trans *self, struct stream *in_s, int size)
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{
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int rcvd;
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if (self->status != TRANS_STATUS_UP)
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{
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return 1;
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}
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while (size > 0)
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{
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/* make sure stream has room */
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if ((in_s->end + size) > (in_s->data + in_s->size))
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{
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return 1;
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}
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rcvd = xrdp_tls_read(self->tls, in_s->end, size);
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if (rcvd == -1)
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{
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if (g_tcp_last_error_would_block(self->sck))
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{
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if (!g_tcp_can_recv(self->sck, 100))
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{
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/* check for term here */
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if (self->is_term != 0)
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{
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if (self->is_term())
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{
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/* term */
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self->status = TRANS_STATUS_DOWN;
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return 1;
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}
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}
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}
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}
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else
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{
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/* error */
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self->status = TRANS_STATUS_DOWN;
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return 1;
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}
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}
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else if (rcvd == 0)
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{
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/* error */
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self->status = TRANS_STATUS_DOWN;
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return 1;
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}
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else
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{
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in_s->end += rcvd;
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size -= rcvd;
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}
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}
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return 0;
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}
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/*****************************************************************************/
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int APP_CC
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xrdp_tls_force_write_s(struct trans *self, struct stream *out_s)
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{
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int size;
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int total;
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int sent;
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if (self->status != TRANS_STATUS_UP)
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{
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return 1;
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}
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size = (int)(out_s->end - out_s->data);
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total = 0;
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if (xrdp_tls_send_waiting(self, 1) != 0)
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{
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self->status = TRANS_STATUS_DOWN;
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return 1;
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}
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while (total < size)
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{
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sent = xrdp_tls_write(self->tls, out_s->data + total, size - total);
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if (sent == -1)
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{
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if (g_tcp_last_error_would_block(self->sck))
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{
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if (!g_tcp_can_send(self->sck, 100))
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{
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/* check for term here */
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if (self->is_term != 0)
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{
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if (self->is_term())
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{
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/* term */
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self->status = TRANS_STATUS_DOWN;
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return 1;
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}
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}
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}
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}
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else
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{
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/* error */
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self->status = TRANS_STATUS_DOWN;
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return 1;
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}
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}
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else if (sent == 0)
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{
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/* error */
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self->status = TRANS_STATUS_DOWN;
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return 1;
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}
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else
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{
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total = total + sent;
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}
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}
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return 0;
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}
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/*****************************************************************************/
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int APP_CC
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xrdp_tls_send_waiting(struct trans *self, int block)
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{
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struct stream *temp_s;
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int bytes;
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int sent;
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int timeout;
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int cont;
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timeout = block ? 100 : 0;
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cont = 1;
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while (cont)
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{
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if (self->wait_s != 0)
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{
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temp_s = self->wait_s;
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if (g_tcp_can_send(self->sck, timeout))
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{
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bytes = (int) (temp_s->end - temp_s->p);
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sent = xrdp_tls_write(self->tls, temp_s->p, bytes);
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if (sent > 0)
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{
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temp_s->p += sent;
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if (temp_s->p >= temp_s->end)
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{
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self->wait_s = (struct stream *) (temp_s->next_packet);
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free_stream(temp_s);
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}
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}
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else if (sent == 0)
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{
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return 1;
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}
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else
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{
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if (!g_tcp_last_error_would_block(self->sck))
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{
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return 1;
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}
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}
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}
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}
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else
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{
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break;
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}
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cont = block;
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}
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return 0;
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}
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