2011-07-04 01:29:09 +04:00
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/**
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* FreeRDP: A Remote Desktop Protocol Client
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* Transport Layer Security
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*
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* Copyright 2011 Marc-Andre Moreau <marcandre.moreau@gmail.com>
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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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2011-08-29 00:46:36 +04:00
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* http://www.apache.org/licenses/LICENSE-2.0
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2011-07-04 01:29:09 +04:00
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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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#include <freerdp/utils/stream.h>
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#include <freerdp/utils/memory.h>
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#include "tls.h"
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2011-07-07 22:11:12 +04:00
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boolean tls_connect(rdpTls* tls)
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2011-07-04 01:29:09 +04:00
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{
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int connection_status;
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2011-08-19 09:35:29 +04:00
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tls->ctx = SSL_CTX_new(TLSv1_client_method());
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if (tls->ctx == NULL)
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{
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printf("SSL_CTX_new failed\n");
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2011-11-19 21:19:16 +04:00
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return false;
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2011-08-19 09:35:29 +04:00
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}
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/*
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* This is necessary, because the Microsoft TLS implementation is not perfect.
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* SSL_OP_ALL enables a couple of workarounds for buggy TLS implementations,
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* but the most important workaround being SSL_OP_TLS_BLOCK_PADDING_BUG.
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* As the size of the encrypted payload may give hints about its contents,
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* block padding is normally used, but the Microsoft TLS implementation
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* won't recognize it and will disconnect you after sending a TLS alert.
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*/
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SSL_CTX_set_options(tls->ctx, SSL_OP_ALL);
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2011-07-04 01:29:09 +04:00
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tls->ssl = SSL_new(tls->ctx);
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if (tls->ssl == NULL)
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{
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printf("SSL_new failed\n");
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2011-11-19 21:19:16 +04:00
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return false;
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2011-07-04 01:29:09 +04:00
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}
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if (SSL_set_fd(tls->ssl, tls->sockfd) < 1)
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{
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printf("SSL_set_fd failed\n");
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2011-11-19 21:19:16 +04:00
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return false;
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2011-07-04 01:29:09 +04:00
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}
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2011-08-19 09:35:29 +04:00
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connection_status = SSL_connect(tls->ssl);
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if (connection_status <= 0)
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2011-07-04 01:29:09 +04:00
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{
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2011-08-19 09:35:29 +04:00
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if (tls_print_error("SSL_connect", tls->ssl, connection_status))
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2011-11-19 21:19:16 +04:00
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return false;
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2011-08-19 09:35:29 +04:00
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}
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2011-07-18 07:16:31 +04:00
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2011-11-19 21:19:16 +04:00
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return true;
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2011-08-19 09:35:29 +04:00
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}
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boolean tls_accept(rdpTls* tls, const char* cert_file, const char* privatekey_file)
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{
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int connection_status;
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tls->ctx = SSL_CTX_new(TLSv1_server_method());
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if (tls->ctx == NULL)
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{
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printf("SSL_CTX_new failed\n");
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2011-11-19 21:19:16 +04:00
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return false;
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2011-07-04 01:29:09 +04:00
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}
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2011-08-19 09:35:29 +04:00
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if (SSL_CTX_use_RSAPrivateKey_file(tls->ctx, privatekey_file, SSL_FILETYPE_PEM) <= 0)
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2011-07-04 01:29:09 +04:00
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{
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2011-08-19 09:35:29 +04:00
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printf("SSL_CTX_use_RSAPrivateKey_file failed\n");
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2011-11-19 21:19:16 +04:00
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return false;
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2011-08-19 09:35:29 +04:00
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}
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tls->ssl = SSL_new(tls->ctx);
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if (tls->ssl == NULL)
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{
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printf("SSL_new failed\n");
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2011-11-19 21:19:16 +04:00
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return false;
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2011-08-19 09:35:29 +04:00
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}
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if (SSL_use_certificate_file(tls->ssl, cert_file, SSL_FILETYPE_PEM) <= 0)
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{
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printf("SSL_use_certificate_file failed\n");
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2011-11-19 21:19:16 +04:00
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return false;
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2011-08-19 09:35:29 +04:00
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}
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if (SSL_set_fd(tls->ssl, tls->sockfd) < 1)
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{
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printf("SSL_set_fd failed\n");
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2011-11-19 21:19:16 +04:00
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return false;
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2011-08-19 09:35:29 +04:00
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}
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connection_status = SSL_accept(tls->ssl);
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if (connection_status <= 0)
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{
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if (tls_print_error("SSL_accept", tls->ssl, connection_status))
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2011-11-19 21:19:16 +04:00
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return false;
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2011-07-04 01:29:09 +04:00
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}
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2011-08-19 09:35:29 +04:00
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printf("TLS connection accepted\n");
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2011-07-04 01:29:09 +04:00
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2011-11-19 21:19:16 +04:00
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return true;
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2011-07-04 01:29:09 +04:00
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}
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2011-07-07 22:11:12 +04:00
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boolean tls_disconnect(rdpTls* tls)
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2011-07-04 01:29:09 +04:00
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{
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2011-08-26 14:14:34 +04:00
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SSL_shutdown(tls->ssl);
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2011-11-19 21:19:16 +04:00
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return true;
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2011-07-04 01:29:09 +04:00
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}
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2011-07-10 23:34:43 +04:00
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int tls_read(rdpTls* tls, uint8* data, int length)
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2011-07-04 01:29:09 +04:00
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{
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int status;
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2011-08-01 18:21:06 +04:00
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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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2011-07-04 01:29:09 +04:00
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{
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2011-08-01 18:21:06 +04:00
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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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2011-08-19 09:35:29 +04:00
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case SSL_ERROR_WANT_WRITE:
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2011-08-01 18:21:06 +04:00
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status = 0;
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break;
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default:
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2011-08-19 09:35:29 +04:00
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tls_print_error("SSL_read", tls->ssl, status);
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2011-08-01 18:21:06 +04:00
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status = -1;
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break;
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2011-07-04 01:29:09 +04:00
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}
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2011-08-01 18:21:06 +04:00
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return status;
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2011-07-04 01:29:09 +04:00
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}
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2011-07-10 23:34:43 +04:00
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int tls_write(rdpTls* tls, uint8* data, int length)
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2011-07-04 01:29:09 +04:00
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{
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2011-07-10 23:34:43 +04:00
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int status;
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2011-07-04 01:29:09 +04:00
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2011-08-01 11:04:07 +04:00
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status = SSL_write(tls->ssl, data, length);
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2011-07-04 01:29:09 +04:00
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2011-08-01 11:04:07 +04:00
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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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2011-07-04 01:29:09 +04:00
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2011-08-19 09:35:29 +04:00
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case SSL_ERROR_WANT_READ:
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2011-08-01 11:04:07 +04:00
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case SSL_ERROR_WANT_WRITE:
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status = 0;
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break;
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2011-07-04 01:29:09 +04:00
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2011-08-01 11:04:07 +04:00
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default:
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tls_print_error("SSL_write", tls->ssl, status);
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status = -1;
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2011-08-07 22:37:26 +04:00
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break;
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2011-07-04 01:29:09 +04:00
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}
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2011-07-10 23:34:43 +04:00
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2011-08-01 11:04:07 +04:00
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return status;
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2011-07-04 01:29:09 +04:00
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}
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2011-07-07 22:11:12 +04:00
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boolean tls_print_error(char *func, SSL *connection, int value)
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2011-07-04 01:29:09 +04:00
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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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printf("%s: Server closed TLS connection\n", func);
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2011-11-19 21:19:16 +04:00
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return true;
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2011-07-04 01:29:09 +04:00
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case SSL_ERROR_WANT_READ:
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printf("SSL_ERROR_WANT_READ\n");
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2011-11-19 21:19:16 +04:00
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return false;
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2011-07-04 01:29:09 +04:00
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case SSL_ERROR_WANT_WRITE:
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printf("SSL_ERROR_WANT_WRITE\n");
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2011-11-19 21:19:16 +04:00
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return false;
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2011-07-04 01:29:09 +04:00
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case SSL_ERROR_SYSCALL:
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printf("%s: I/O error\n", func);
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2011-11-19 21:19:16 +04:00
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return true;
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2011-07-04 01:29:09 +04:00
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case SSL_ERROR_SSL:
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printf("%s: Failure in SSL library (protocol error?)\n", func);
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2011-11-19 21:19:16 +04:00
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return true;
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2011-07-04 01:29:09 +04:00
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default:
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printf("%s: Unknown error\n", func);
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2011-11-19 21:19:16 +04:00
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return true;
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2011-07-04 01:29:09 +04:00
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}
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}
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2011-07-07 22:11:12 +04:00
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CryptoCert tls_get_certificate(rdpTls * tls)
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2011-07-07 18:33:42 +04:00
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{
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CryptoCert cert;
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2011-07-07 22:11:12 +04:00
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X509* server_cert;
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2011-07-07 18:33:42 +04:00
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server_cert = SSL_get_peer_certificate(tls->ssl);
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if (!server_cert)
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{
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printf("ssl_verify: failed to get the server SSL certificate\n");
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cert = NULL;
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}
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else
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{
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cert = xmalloc(sizeof(*cert));
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cert->px509 = server_cert;
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}
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return cert;
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}
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2011-07-07 22:11:12 +04:00
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rdpTls* tls_new()
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2011-07-04 01:29:09 +04:00
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{
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2011-07-07 22:11:12 +04:00
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rdpTls* tls;
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tls = (rdpTls*) xzalloc(sizeof(rdpTls));
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2011-07-04 01:29:09 +04:00
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if (tls != NULL)
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{
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SSL_load_error_strings();
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SSL_library_init();
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}
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return tls;
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}
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2011-08-29 00:46:36 +04:00
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2011-09-27 06:58:49 +04:00
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int tls_verify_certificate(CryptoCert cert, rdpSettings* settings, char* hostname)
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2011-08-29 00:46:36 +04:00
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{
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2011-09-26 00:30:20 +04:00
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boolean status;
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2012-02-03 02:36:07 +04:00
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rdpCertificateStore* certificate_store;
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certificate_store = certificate_store_new(settings);
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status = x509_verify_certificate(cert, certificate_store->path);
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2011-08-30 20:20:36 +04:00
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2011-11-19 21:19:16 +04:00
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if (status != true)
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2011-08-29 00:46:36 +04:00
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{
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2011-12-10 20:23:48 +04:00
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char* issuer;
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char* subject;
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char* fingerprint;
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2012-02-03 02:36:07 +04:00
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rdpCertificateData* certificate_data;
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2011-12-10 20:23:48 +04:00
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2012-02-03 02:36:07 +04:00
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certificate_data = crypto_get_certificate_data(cert->px509, hostname);
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2011-08-30 20:20:36 +04:00
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2012-02-03 02:36:07 +04:00
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if (certificate_data_match(certificate_store, certificate_data) == 0)
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return 0;
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2011-08-30 20:20:36 +04:00
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2011-12-10 20:23:48 +04:00
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issuer = crypto_cert_issuer(cert->px509);
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subject = crypto_cert_subject(cert->px509);
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fingerprint = crypto_cert_fingerprint(cert->px509);
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2012-02-03 02:36:07 +04:00
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if (certificate_store->match == 1)
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2011-08-29 00:46:36 +04:00
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{
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2011-12-10 20:23:48 +04:00
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boolean accept_certificate = settings->ignore_certificate;
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if (!accept_certificate)
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2011-10-19 11:42:53 +04:00
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{
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2011-12-10 20:23:48 +04:00
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freerdp* instance = (freerdp*) settings->instance;
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2011-10-19 11:42:53 +04:00
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2011-12-10 20:23:48 +04:00
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if (instance->VerifyCertificate)
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2011-10-19 11:42:53 +04:00
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accept_certificate = instance->VerifyCertificate(instance, subject, issuer, fingerprint);
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xfree(issuer);
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xfree(subject);
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xfree(fingerprint);
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}
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2011-10-18 19:02:05 +04:00
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2011-12-10 20:23:48 +04:00
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if (!accept_certificate)
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2011-10-18 19:02:05 +04:00
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return 1;
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2011-10-28 19:38:45 +04:00
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2012-02-03 02:36:07 +04:00
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certificate_data_print(certificate_store, certificate_data);
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2011-08-29 00:46:36 +04:00
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}
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2012-02-03 02:36:07 +04:00
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else if (certificate_store->match == -1)
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2011-08-29 00:46:36 +04:00
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{
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2011-12-10 20:23:48 +04:00
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tls_print_cert_error(hostname, fingerprint);
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2012-02-03 02:36:07 +04:00
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certificate_store_free(certificate_store);
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2011-08-29 00:56:34 +04:00
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return 1;
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2011-08-29 00:46:36 +04:00
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}
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}
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2011-08-30 20:20:36 +04:00
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2012-02-03 02:36:07 +04:00
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certificate_store_free(certificate_store);
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2011-08-29 01:54:53 +04:00
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return 0;
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2011-08-29 00:46:36 +04:00
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}
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2011-12-10 20:23:48 +04:00
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void tls_print_cert_error(char* hostname, char* fingerprint)
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2011-08-26 07:10:49 +04:00
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{
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2011-12-10 20:23:48 +04:00
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printf("The host key for %s has changed\n", hostname);
|
|
|
|
printf("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@\n");
|
|
|
|
printf("@ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! @\n");
|
|
|
|
printf("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@\n");
|
|
|
|
printf("IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!\n");
|
|
|
|
printf("Someone could be eavesdropping on you right now (man-in-the-middle attack)!\n");
|
|
|
|
printf("It is also possible that a host key has just been changed.\n");
|
|
|
|
printf("The fingerprint for the host key sent by the remote host is\n%s\n", fingerprint);
|
|
|
|
printf("Please contact your system administrator.\n");
|
|
|
|
printf("Add correct host key in ~/.freerdp/known_hosts to get rid of this message.\n");
|
|
|
|
printf("Host key for %s has changed and you have requested strict checking.\n", hostname);
|
|
|
|
printf("Host key verification failed.\n");
|
2011-08-26 07:10:49 +04:00
|
|
|
}
|
2011-07-04 01:29:09 +04:00
|
|
|
|
2011-07-07 22:11:12 +04:00
|
|
|
void tls_free(rdpTls* tls)
|
2011-07-04 01:29:09 +04:00
|
|
|
{
|
|
|
|
if (tls != NULL)
|
|
|
|
{
|
2011-08-25 09:45:43 +04:00
|
|
|
if (tls->ssl)
|
|
|
|
SSL_free(tls->ssl);
|
|
|
|
if (tls->ctx)
|
|
|
|
SSL_CTX_free(tls->ctx);
|
2011-07-04 01:29:09 +04:00
|
|
|
xfree(tls);
|
|
|
|
}
|
|
|
|
}
|