7fc1c65165
When a certificate has changed, display not only the fingerprint but also subject and issuer of old certificate.
1359 lines
30 KiB
C
1359 lines
30 KiB
C
/**
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* FreeRDP: A Remote Desktop Protocol Implementation
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* Transport Layer Security
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*
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* Copyright 2011-2012 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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* 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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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <assert.h>
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#include <string.h>
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#include <winpr/crt.h>
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#include <winpr/sspi.h>
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#include <winpr/ssl.h>
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#include <winpr/stream.h>
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#include <freerdp/utils/ringbuffer.h>
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#include <freerdp/log.h>
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#include <freerdp/crypto/tls.h>
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#include "../core/tcp.h"
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#ifdef HAVE_POLL_H
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#include <poll.h>
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#endif
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#ifdef HAVE_VALGRIND_MEMCHECK_H
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#include <valgrind/memcheck.h>
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#endif
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#define TAG FREERDP_TAG("crypto")
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struct _BIO_RDP_TLS
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{
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SSL* ssl;
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};
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typedef struct _BIO_RDP_TLS BIO_RDP_TLS;
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long bio_rdp_tls_callback(BIO* bio, int mode, const char* argp, int argi, long argl, long ret)
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{
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return 1;
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}
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static int bio_rdp_tls_write(BIO* bio, const char* buf, int size)
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{
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int status;
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BIO_RDP_TLS* tls = (BIO_RDP_TLS*) bio->ptr;
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if (!buf || !tls)
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return 0;
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BIO_clear_flags(bio, BIO_FLAGS_WRITE | BIO_FLAGS_READ | BIO_FLAGS_IO_SPECIAL);
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status = SSL_write(tls->ssl, buf, size);
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if (status <= 0)
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{
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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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BIO_clear_flags(bio, BIO_FLAGS_SHOULD_RETRY);
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break;
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case SSL_ERROR_WANT_WRITE:
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BIO_set_flags(bio, BIO_FLAGS_WRITE | BIO_FLAGS_SHOULD_RETRY);
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break;
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case SSL_ERROR_WANT_READ:
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BIO_set_flags(bio, BIO_FLAGS_READ | BIO_FLAGS_SHOULD_RETRY);
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break;
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case SSL_ERROR_WANT_X509_LOOKUP:
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BIO_set_flags(bio, BIO_FLAGS_IO_SPECIAL);
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bio->retry_reason = BIO_RR_SSL_X509_LOOKUP;
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break;
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case SSL_ERROR_WANT_CONNECT:
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BIO_set_flags(bio, BIO_FLAGS_IO_SPECIAL);
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bio->retry_reason = BIO_RR_CONNECT;
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break;
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case SSL_ERROR_SYSCALL:
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BIO_clear_flags(bio, BIO_FLAGS_SHOULD_RETRY);
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break;
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case SSL_ERROR_SSL:
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BIO_clear_flags(bio, BIO_FLAGS_SHOULD_RETRY);
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break;
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}
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}
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return status;
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}
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static int bio_rdp_tls_read(BIO* bio, char* buf, int size)
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{
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int status;
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BIO_RDP_TLS* tls = (BIO_RDP_TLS*) bio->ptr;
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if (!buf || !tls)
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return 0;
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BIO_clear_flags(bio, BIO_FLAGS_WRITE | BIO_FLAGS_READ | BIO_FLAGS_IO_SPECIAL);
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status = SSL_read(tls->ssl, buf, size);
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if (status <= 0)
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{
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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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BIO_clear_flags(bio, BIO_FLAGS_SHOULD_RETRY);
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break;
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case SSL_ERROR_WANT_READ:
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BIO_set_flags(bio, BIO_FLAGS_READ | BIO_FLAGS_SHOULD_RETRY);
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break;
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case SSL_ERROR_WANT_WRITE:
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BIO_set_flags(bio, BIO_FLAGS_WRITE | BIO_FLAGS_SHOULD_RETRY);
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break;
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case SSL_ERROR_WANT_X509_LOOKUP:
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BIO_set_flags(bio, BIO_FLAGS_IO_SPECIAL);
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bio->retry_reason = BIO_RR_SSL_X509_LOOKUP;
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break;
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case SSL_ERROR_WANT_ACCEPT:
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BIO_set_flags(bio, BIO_FLAGS_IO_SPECIAL);
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bio->retry_reason = BIO_RR_ACCEPT;
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break;
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case SSL_ERROR_WANT_CONNECT:
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BIO_set_flags(bio, BIO_FLAGS_IO_SPECIAL);
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bio->retry_reason = BIO_RR_CONNECT;
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break;
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case SSL_ERROR_SSL:
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BIO_clear_flags(bio, BIO_FLAGS_SHOULD_RETRY);
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break;
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case SSL_ERROR_ZERO_RETURN:
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BIO_clear_flags(bio, BIO_FLAGS_SHOULD_RETRY);
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break;
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case SSL_ERROR_SYSCALL:
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BIO_clear_flags(bio, BIO_FLAGS_SHOULD_RETRY);
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break;
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}
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}
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#ifdef HAVE_VALGRIND_MEMCHECK_H
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if (status > 0)
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{
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VALGRIND_MAKE_MEM_DEFINED(buf, status);
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}
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#endif
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return status;
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}
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static int bio_rdp_tls_puts(BIO* bio, const char* str)
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{
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int size;
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int status;
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if (!str)
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return 0;
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size = strlen(str);
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status = BIO_write(bio, str, size);
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return status;
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}
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static int bio_rdp_tls_gets(BIO* bio, char* str, int size)
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{
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return 1;
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}
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static long bio_rdp_tls_ctrl(BIO* bio, int cmd, long num, void* ptr)
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{
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BIO* rbio;
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int status = -1;
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BIO_RDP_TLS* tls = (BIO_RDP_TLS*) bio->ptr;
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if (!tls)
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return 0;
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if (!tls->ssl && (cmd != BIO_C_SET_SSL))
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return 0;
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switch (cmd)
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{
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case BIO_CTRL_RESET:
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SSL_shutdown(tls->ssl);
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if (tls->ssl->handshake_func == tls->ssl->method->ssl_connect)
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SSL_set_connect_state(tls->ssl);
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else if (tls->ssl->handshake_func == tls->ssl->method->ssl_accept)
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SSL_set_accept_state(tls->ssl);
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SSL_clear(tls->ssl);
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if (bio->next_bio)
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status = BIO_ctrl(bio->next_bio, cmd, num, ptr);
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else if (tls->ssl->rbio)
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status = BIO_ctrl(tls->ssl->rbio, cmd, num, ptr);
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else
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status = 1;
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break;
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case BIO_C_GET_FD:
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status = BIO_ctrl(tls->ssl->rbio, cmd, num, ptr);
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break;
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case BIO_CTRL_INFO:
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status = 0;
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break;
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case BIO_CTRL_SET_CALLBACK:
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status = 0;
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break;
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case BIO_CTRL_GET_CALLBACK:
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*((ULONG_PTR*) ptr) = (ULONG_PTR) SSL_get_info_callback(tls->ssl);
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status = 1;
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break;
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case BIO_C_SSL_MODE:
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if (num)
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SSL_set_connect_state(tls->ssl);
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else
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SSL_set_accept_state(tls->ssl);
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status = 1;
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break;
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case BIO_CTRL_GET_CLOSE:
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status = bio->shutdown;
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break;
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case BIO_CTRL_SET_CLOSE:
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bio->shutdown = (int) num;
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status = 1;
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break;
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case BIO_CTRL_WPENDING:
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status = BIO_ctrl(tls->ssl->wbio, cmd, num, ptr);
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break;
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case BIO_CTRL_PENDING:
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status = SSL_pending(tls->ssl);
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if (status == 0)
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status = BIO_pending(tls->ssl->rbio);
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break;
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case BIO_CTRL_FLUSH:
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BIO_clear_retry_flags(bio);
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status = BIO_ctrl(tls->ssl->wbio, cmd, num, ptr);
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BIO_copy_next_retry(bio);
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status = 1;
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break;
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case BIO_CTRL_PUSH:
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if (bio->next_bio && (bio->next_bio != tls->ssl->rbio))
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{
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SSL_set_bio(tls->ssl, bio->next_bio, bio->next_bio);
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CRYPTO_add(&(bio->next_bio->references), 1, CRYPTO_LOCK_BIO);
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}
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status = 1;
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break;
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case BIO_CTRL_POP:
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if (bio == ptr)
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{
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if (tls->ssl->rbio != tls->ssl->wbio)
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BIO_free_all(tls->ssl->wbio);
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if (bio->next_bio)
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CRYPTO_add(&(bio->next_bio->references), -1, CRYPTO_LOCK_BIO);
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tls->ssl->wbio = tls->ssl->rbio = NULL;
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}
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status = 1;
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break;
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case BIO_C_GET_SSL:
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if (ptr)
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{
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*((SSL**) ptr) = tls->ssl;
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status = 1;
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}
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break;
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case BIO_C_SET_SSL:
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bio->shutdown = (int) num;
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if (ptr)
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tls->ssl = (SSL*) ptr;
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rbio = SSL_get_rbio(tls->ssl);
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if (rbio)
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{
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if (bio->next_bio)
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BIO_push(rbio, bio->next_bio);
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bio->next_bio = rbio;
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CRYPTO_add(&(rbio->references), 1, CRYPTO_LOCK_BIO);
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}
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bio->init = 1;
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status = 1;
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break;
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case BIO_C_DO_STATE_MACHINE:
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BIO_clear_flags(bio, BIO_FLAGS_READ | BIO_FLAGS_WRITE | BIO_FLAGS_IO_SPECIAL);
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bio->retry_reason = 0;
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status = SSL_do_handshake(tls->ssl);
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if (status <= 0)
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{
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switch (SSL_get_error(tls->ssl, status))
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{
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case SSL_ERROR_WANT_READ:
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BIO_set_flags(bio, BIO_FLAGS_READ | BIO_FLAGS_SHOULD_RETRY);
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break;
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case SSL_ERROR_WANT_WRITE:
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BIO_set_flags(bio, BIO_FLAGS_WRITE | BIO_FLAGS_SHOULD_RETRY);
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break;
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case SSL_ERROR_WANT_CONNECT:
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BIO_set_flags(bio, BIO_FLAGS_IO_SPECIAL | BIO_FLAGS_SHOULD_RETRY);
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bio->retry_reason = bio->next_bio->retry_reason;
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break;
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default:
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BIO_clear_flags(bio, BIO_FLAGS_SHOULD_RETRY);
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break;
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}
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}
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break;
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default:
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status = BIO_ctrl(tls->ssl->rbio, cmd, num, ptr);
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break;
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}
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return status;
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}
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static int bio_rdp_tls_new(BIO* bio)
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{
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BIO_RDP_TLS* tls;
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bio->init = 0;
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bio->num = 0;
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bio->flags = BIO_FLAGS_SHOULD_RETRY;
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bio->next_bio = NULL;
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tls = calloc(1, sizeof(BIO_RDP_TLS));
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if (!tls)
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return 0;
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bio->ptr = (void*) tls;
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return 1;
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}
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static int bio_rdp_tls_free(BIO* bio)
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{
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BIO_RDP_TLS* tls;
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if (!bio)
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return 0;
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tls = (BIO_RDP_TLS*) bio->ptr;
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|
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if (!tls)
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return 0;
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if (bio->shutdown)
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{
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if (bio->init && tls->ssl)
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{
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SSL_shutdown(tls->ssl);
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SSL_free(tls->ssl);
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}
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bio->init = 0;
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bio->flags = 0;
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}
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free(tls);
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return 1;
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}
|
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|
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static long bio_rdp_tls_callback_ctrl(BIO* bio, int cmd, bio_info_cb* fp)
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{
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int status = 0;
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BIO_RDP_TLS* tls;
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|
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if (!bio)
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return 0;
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tls = (BIO_RDP_TLS*) bio->ptr;
|
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|
|
if (!tls)
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return 0;
|
|
|
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switch (cmd)
|
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{
|
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case BIO_CTRL_SET_CALLBACK:
|
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SSL_set_info_callback(tls->ssl, (void (*)(const SSL *, int, int)) fp);
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status = 1;
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break;
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default:
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status = BIO_callback_ctrl(tls->ssl->rbio, cmd, fp);
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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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#define BIO_TYPE_RDP_TLS 68
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|
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static BIO_METHOD bio_rdp_tls_methods =
|
|
{
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BIO_TYPE_RDP_TLS,
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"RdpTls",
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bio_rdp_tls_write,
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bio_rdp_tls_read,
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bio_rdp_tls_puts,
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bio_rdp_tls_gets,
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bio_rdp_tls_ctrl,
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bio_rdp_tls_new,
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bio_rdp_tls_free,
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bio_rdp_tls_callback_ctrl,
|
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};
|
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|
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BIO_METHOD* BIO_s_rdp_tls(void)
|
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{
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return &bio_rdp_tls_methods;
|
|
}
|
|
|
|
BIO* BIO_new_rdp_tls(SSL_CTX* ctx, int client)
|
|
{
|
|
BIO* bio;
|
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SSL* ssl;
|
|
|
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bio = BIO_new(BIO_s_rdp_tls());
|
|
|
|
if (!bio)
|
|
return NULL;
|
|
|
|
ssl = SSL_new(ctx);
|
|
|
|
if (!ssl)
|
|
{
|
|
BIO_free(bio);
|
|
return NULL;
|
|
}
|
|
|
|
if (client)
|
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SSL_set_connect_state(ssl);
|
|
else
|
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SSL_set_accept_state(ssl);
|
|
|
|
BIO_set_ssl(bio, ssl, BIO_CLOSE);
|
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|
|
return bio;
|
|
}
|
|
|
|
static CryptoCert tls_get_certificate(rdpTls* tls, BOOL peer)
|
|
{
|
|
CryptoCert cert;
|
|
X509* remote_cert;
|
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STACK_OF(X509) *chain;
|
|
|
|
if (peer)
|
|
remote_cert = SSL_get_peer_certificate(tls->ssl);
|
|
else
|
|
remote_cert = X509_dup( SSL_get_certificate(tls->ssl) );
|
|
|
|
if (!remote_cert)
|
|
{
|
|
WLog_ERR(TAG, "failed to get the server TLS certificate");
|
|
return NULL;
|
|
}
|
|
|
|
cert = malloc(sizeof(*cert));
|
|
if (!cert)
|
|
{
|
|
X509_free(remote_cert);
|
|
return NULL;
|
|
}
|
|
|
|
cert->px509 = remote_cert;
|
|
|
|
/* Get the peer's chain. If it does not exist, we're setting NULL (clean data either way) */
|
|
chain = SSL_get_peer_cert_chain(tls->ssl);
|
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cert->px509chain = chain;
|
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|
|
return cert;
|
|
}
|
|
|
|
static void tls_free_certificate(CryptoCert cert)
|
|
{
|
|
X509_free(cert->px509);
|
|
free(cert);
|
|
}
|
|
|
|
#define TLS_SERVER_END_POINT "tls-server-end-point:"
|
|
|
|
SecPkgContext_Bindings* tls_get_channel_bindings(X509* cert)
|
|
{
|
|
int PrefixLength;
|
|
BYTE CertificateHash[32];
|
|
UINT32 CertificateHashLength;
|
|
BYTE* ChannelBindingToken;
|
|
UINT32 ChannelBindingTokenLength;
|
|
SEC_CHANNEL_BINDINGS* ChannelBindings;
|
|
SecPkgContext_Bindings* ContextBindings;
|
|
|
|
ZeroMemory(CertificateHash, sizeof(CertificateHash));
|
|
X509_digest(cert, EVP_sha256(), CertificateHash, &CertificateHashLength);
|
|
|
|
PrefixLength = strlen(TLS_SERVER_END_POINT);
|
|
ChannelBindingTokenLength = PrefixLength + CertificateHashLength;
|
|
|
|
ContextBindings = (SecPkgContext_Bindings*) calloc(1, sizeof(SecPkgContext_Bindings));
|
|
if (!ContextBindings)
|
|
return NULL;
|
|
|
|
ContextBindings->BindingsLength = sizeof(SEC_CHANNEL_BINDINGS) + ChannelBindingTokenLength;
|
|
ChannelBindings = (SEC_CHANNEL_BINDINGS*) calloc(1, ContextBindings->BindingsLength);
|
|
if (!ChannelBindings)
|
|
goto out_free;
|
|
ContextBindings->Bindings = ChannelBindings;
|
|
|
|
ChannelBindings->cbApplicationDataLength = ChannelBindingTokenLength;
|
|
ChannelBindings->dwApplicationDataOffset = sizeof(SEC_CHANNEL_BINDINGS);
|
|
ChannelBindingToken = &((BYTE*) ChannelBindings)[ChannelBindings->dwApplicationDataOffset];
|
|
|
|
strcpy((char*) ChannelBindingToken, TLS_SERVER_END_POINT);
|
|
CopyMemory(&ChannelBindingToken[PrefixLength], CertificateHash, CertificateHashLength);
|
|
|
|
return ContextBindings;
|
|
|
|
out_free:
|
|
free(ContextBindings);
|
|
return NULL;
|
|
}
|
|
|
|
|
|
#if defined(__APPLE__)
|
|
BOOL tls_prepare(rdpTls* tls, BIO* underlying, SSL_METHOD* method, int options, BOOL clientMode)
|
|
#else
|
|
BOOL tls_prepare(rdpTls* tls, BIO* underlying, const SSL_METHOD* method, int options, BOOL clientMode)
|
|
#endif
|
|
{
|
|
rdpSettings* settings = tls->settings;
|
|
|
|
tls->ctx = SSL_CTX_new(method);
|
|
|
|
if (!tls->ctx)
|
|
{
|
|
WLog_ERR(TAG, "SSL_CTX_new failed");
|
|
return FALSE;
|
|
}
|
|
|
|
SSL_CTX_set_mode(tls->ctx, SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER | SSL_MODE_ENABLE_PARTIAL_WRITE);
|
|
|
|
SSL_CTX_set_options(tls->ctx, options);
|
|
SSL_CTX_set_read_ahead(tls->ctx, 1);
|
|
|
|
if (settings->AllowedTlsCiphers)
|
|
{
|
|
if (!SSL_CTX_set_cipher_list(tls->ctx, settings->AllowedTlsCiphers))
|
|
{
|
|
WLog_ERR(TAG, "SSL_CTX_set_cipher_list %s failed", settings->AllowedTlsCiphers);
|
|
return FALSE;
|
|
}
|
|
}
|
|
|
|
tls->bio = BIO_new_rdp_tls(tls->ctx, clientMode);
|
|
|
|
if (BIO_get_ssl(tls->bio, &tls->ssl) < 0)
|
|
{
|
|
WLog_ERR(TAG, "unable to retrieve the SSL of the connection");
|
|
return FALSE;
|
|
}
|
|
|
|
BIO_push(tls->bio, underlying);
|
|
tls->underlying = underlying;
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
int tls_do_handshake(rdpTls* tls, BOOL clientMode)
|
|
{
|
|
CryptoCert cert;
|
|
int verify_status, status;
|
|
|
|
do
|
|
{
|
|
#ifdef HAVE_POLL_H
|
|
struct pollfd pollfds;
|
|
#else
|
|
struct timeval tv;
|
|
fd_set rset;
|
|
#endif
|
|
int fd;
|
|
|
|
status = BIO_do_handshake(tls->bio);
|
|
|
|
if (status == 1)
|
|
break;
|
|
|
|
if (!BIO_should_retry(tls->bio))
|
|
return -1;
|
|
|
|
/* we select() only for read even if we should test both read and write
|
|
* depending of what have blocked */
|
|
fd = BIO_get_fd(tls->bio, NULL);
|
|
|
|
if (fd < 0)
|
|
{
|
|
WLog_ERR(TAG, "unable to retrieve BIO fd");
|
|
return -1;
|
|
}
|
|
|
|
#ifdef HAVE_POLL_H
|
|
pollfds.fd = fd;
|
|
pollfds.events = POLLIN;
|
|
pollfds.revents = 0;
|
|
|
|
do
|
|
{
|
|
status = poll(&pollfds, 1, 10 * 1000);
|
|
}
|
|
while ((status < 0) && (errno == EINTR));
|
|
#else
|
|
FD_ZERO(&rset);
|
|
FD_SET(fd, &rset);
|
|
tv.tv_sec = 0;
|
|
tv.tv_usec = 10 * 1000; /* 10ms */
|
|
|
|
status = _select(fd + 1, &rset, NULL, NULL, &tv);
|
|
#endif
|
|
if (status < 0)
|
|
{
|
|
WLog_ERR(TAG, "error during select()");
|
|
return -1;
|
|
}
|
|
}
|
|
while (TRUE);
|
|
|
|
cert = tls_get_certificate(tls, clientMode);
|
|
if (!cert)
|
|
{
|
|
WLog_ERR(TAG, "tls_get_certificate failed to return the server certificate.");
|
|
return -1;
|
|
}
|
|
|
|
tls->Bindings = tls_get_channel_bindings(cert->px509);
|
|
if (!tls->Bindings)
|
|
{
|
|
WLog_ERR(TAG, "unable to retrieve bindings");
|
|
verify_status = -1;
|
|
goto out;
|
|
}
|
|
|
|
if (!crypto_cert_get_public_key(cert, &tls->PublicKey, &tls->PublicKeyLength))
|
|
{
|
|
WLog_ERR(TAG, "crypto_cert_get_public_key failed to return the server public key.");
|
|
verify_status = -1;
|
|
goto out;
|
|
}
|
|
|
|
/* Note: server-side NLA needs public keys (keys from us, the server) but no
|
|
* certificate verify
|
|
*/
|
|
verify_status = 1;
|
|
if (clientMode)
|
|
{
|
|
verify_status = tls_verify_certificate(tls, cert, tls->hostname, tls->port);
|
|
|
|
if (verify_status < 1)
|
|
{
|
|
WLog_ERR(TAG, "certificate not trusted, aborting.");
|
|
tls_send_alert(tls);
|
|
verify_status = 0;
|
|
}
|
|
}
|
|
|
|
out:
|
|
tls_free_certificate(cert);
|
|
|
|
return verify_status;
|
|
}
|
|
|
|
int tls_connect(rdpTls* tls, BIO* underlying)
|
|
{
|
|
int options = 0;
|
|
|
|
/**
|
|
* 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.
|
|
*/
|
|
#ifdef SSL_OP_NO_COMPRESSION
|
|
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;
|
|
|
|
if (!tls_prepare(tls, underlying, TLSv1_client_method(), options, TRUE))
|
|
return FALSE;
|
|
|
|
return tls_do_handshake(tls, TRUE);
|
|
}
|
|
|
|
#ifndef OPENSSL_NO_TLSEXT
|
|
static void tls_openssl_tlsext_debug_callback(SSL *s, int client_server,
|
|
int type, unsigned char *data, int len, void *arg)
|
|
{
|
|
/* see code comment in tls_accept() below */
|
|
|
|
if (type == TLSEXT_TYPE_server_name) {
|
|
WLog_DBG(TAG, "Client uses SNI (extension disabled)");
|
|
s->servername_done = 2;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
BOOL tls_accept(rdpTls* tls, BIO* underlying, const char* cert_file, const char* privatekey_file)
|
|
{
|
|
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.
|
|
*/
|
|
#ifdef SSL_OP_NO_COMPRESSION
|
|
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;
|
|
|
|
if (!tls_prepare(tls, underlying, SSLv23_server_method(), options, FALSE))
|
|
return FALSE;
|
|
|
|
if (SSL_use_RSAPrivateKey_file(tls->ssl, privatekey_file, SSL_FILETYPE_PEM) <= 0)
|
|
{
|
|
WLog_ERR(TAG, "SSL_CTX_use_RSAPrivateKey_file failed");
|
|
WLog_ERR(TAG, "PrivateKeyFile: %s", privatekey_file);
|
|
return FALSE;
|
|
}
|
|
|
|
if (SSL_use_certificate_file(tls->ssl, cert_file, SSL_FILETYPE_PEM) <= 0)
|
|
{
|
|
WLog_ERR(TAG, "SSL_use_certificate_file failed");
|
|
return FALSE;
|
|
}
|
|
|
|
#ifndef OPENSSL_NO_TLSEXT
|
|
/**
|
|
* The Microsoft iOS clients eventually send a null or even double null
|
|
* terminated hostname in the SNI TLS extension!
|
|
* If the length indicator does not equal the hostname strlen OpenSSL
|
|
* will abort (see openssl:ssl/t1_lib.c).
|
|
* Here is a tcpdump segment of Microsoft Remote Desktop Client Version
|
|
* 8.1.7 running on an iPhone 4 with iOS 7.1.2 showing the transmitted
|
|
* SNI hostname TLV blob when connection to server "abcd":
|
|
* 00 name_type 0x00 (host_name)
|
|
* 00 06 length_in_bytes 0x0006
|
|
* 61 62 63 64 00 00 host_name "abcd\0\0"
|
|
*
|
|
* Currently the only (runtime) workaround is setting an openssl tls
|
|
* extension debug callback that sets the SSL context's servername_done
|
|
* to 1 which effectively disables the parsing of that extension type.
|
|
*/
|
|
|
|
SSL_set_tlsext_debug_callback(tls->ssl, tls_openssl_tlsext_debug_callback);
|
|
#endif
|
|
|
|
return tls_do_handshake(tls, FALSE) > 0;
|
|
}
|
|
|
|
BOOL tls_send_alert(rdpTls* tls)
|
|
{
|
|
if (!tls)
|
|
return FALSE;
|
|
|
|
if (!tls->ssl)
|
|
return TRUE;
|
|
|
|
if (tls->alertDescription != TLS_ALERT_DESCRIPTION_CLOSE_NOTIFY)
|
|
{
|
|
/**
|
|
* OpenSSL doesn't really expose an API for sending a TLS alert manually.
|
|
*
|
|
* The following code disables the sending of the default "close notify"
|
|
* and then proceeds to force sending a custom TLS alert before shutting down.
|
|
*
|
|
* Manually sending a TLS alert is necessary in certain cases,
|
|
* like when server-side NLA results in an authentication failure.
|
|
*/
|
|
|
|
SSL_set_quiet_shutdown(tls->ssl, 1);
|
|
|
|
if ((tls->alertLevel == TLS_ALERT_LEVEL_FATAL) && (tls->ssl->session))
|
|
SSL_CTX_remove_session(tls->ssl->ctx, tls->ssl->session);
|
|
|
|
tls->ssl->s3->alert_dispatch = 1;
|
|
tls->ssl->s3->send_alert[0] = tls->alertLevel;
|
|
tls->ssl->s3->send_alert[1] = tls->alertDescription;
|
|
|
|
if (tls->ssl->s3->wbuf.left == 0)
|
|
tls->ssl->method->ssl_dispatch_alert(tls->ssl);
|
|
}
|
|
return TRUE;
|
|
}
|
|
|
|
|
|
BIO *findBufferedBio(BIO *front)
|
|
{
|
|
BIO *ret = front;
|
|
|
|
while (ret)
|
|
{
|
|
if (BIO_method_type(ret) == BIO_TYPE_BUFFERED)
|
|
return ret;
|
|
ret = ret->next_bio;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
int tls_write_all(rdpTls* tls, const BYTE* data, int length)
|
|
{
|
|
int status;
|
|
int offset = 0;
|
|
BIO* bio = tls->bio;
|
|
|
|
while (offset < length)
|
|
{
|
|
status = BIO_write(bio, &data[offset], length - offset);
|
|
|
|
if (status > 0)
|
|
{
|
|
offset += status;
|
|
}
|
|
else
|
|
{
|
|
if (!BIO_should_retry(bio))
|
|
return -1;
|
|
|
|
if (BIO_write_blocked(bio))
|
|
status = BIO_wait_write(bio, 100);
|
|
else if (BIO_read_blocked(bio))
|
|
status = BIO_wait_read(bio, 100);
|
|
else
|
|
USleep(100);
|
|
|
|
if (status < 0)
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
return length;
|
|
}
|
|
|
|
int tls_set_alert_code(rdpTls* tls, int level, int description)
|
|
{
|
|
tls->alertLevel = level;
|
|
tls->alertDescription = description;
|
|
|
|
return 0;
|
|
}
|
|
|
|
BOOL tls_match_hostname(char *pattern, int pattern_length, char *hostname)
|
|
{
|
|
if (strlen(hostname) == pattern_length)
|
|
{
|
|
if (_strnicmp( hostname, pattern, pattern_length) == 0)
|
|
return TRUE;
|
|
}
|
|
|
|
if ((pattern_length > 2) && (pattern[0] == '*') && (pattern[1] == '.') && (((int) strlen(hostname)) >= pattern_length))
|
|
{
|
|
char* check_hostname = &hostname[strlen(hostname) - pattern_length + 1];
|
|
|
|
if (_strnicmp( check_hostname, &pattern[1], pattern_length - 1) == 0)
|
|
{
|
|
return TRUE;
|
|
}
|
|
}
|
|
|
|
return FALSE;
|
|
}
|
|
|
|
int tls_verify_certificate(rdpTls* tls, CryptoCert cert, char* hostname, int port)
|
|
{
|
|
int match;
|
|
int index;
|
|
char* common_name = NULL;
|
|
int common_name_length = 0;
|
|
char** alt_names = NULL;
|
|
int alt_names_count = 0;
|
|
int* alt_names_lengths = NULL;
|
|
BOOL certificate_status;
|
|
BOOL hostname_match = FALSE;
|
|
BOOL verification_status = FALSE;
|
|
rdpCertificateData* certificate_data;
|
|
|
|
if (tls->settings->ExternalCertificateManagement)
|
|
{
|
|
BIO* bio;
|
|
int status;
|
|
int length;
|
|
int offset;
|
|
BYTE* pemCert;
|
|
freerdp* instance = (freerdp*) tls->settings->instance;
|
|
|
|
/**
|
|
* Don't manage certificates internally, leave it up entirely to the external client implementation
|
|
*/
|
|
|
|
bio = BIO_new(BIO_s_mem());
|
|
|
|
if (!bio)
|
|
{
|
|
WLog_ERR(TAG, "BIO_new() failure");
|
|
return -1;
|
|
}
|
|
|
|
status = PEM_write_bio_X509(bio, cert->px509);
|
|
|
|
if (status < 0)
|
|
{
|
|
WLog_ERR(TAG, "PEM_write_bio_X509 failure: %d", status);
|
|
return -1;
|
|
}
|
|
|
|
offset = 0;
|
|
length = 2048;
|
|
pemCert = (BYTE*) malloc(length + 1);
|
|
|
|
status = BIO_read(bio, pemCert, length);
|
|
|
|
if (status < 0)
|
|
{
|
|
WLog_ERR(TAG, "failed to read certificate");
|
|
return -1;
|
|
}
|
|
|
|
offset += status;
|
|
|
|
while (offset >= length)
|
|
{
|
|
int new_len;
|
|
BYTE *new_cert;
|
|
|
|
new_len = length * 2;
|
|
new_cert = (BYTE*) realloc(pemCert, new_len + 1);
|
|
if (!new_cert)
|
|
return -1;
|
|
length = new_len;
|
|
pemCert = new_cert;
|
|
|
|
status = BIO_read(bio, &pemCert[offset], length);
|
|
|
|
if (status < 0)
|
|
break;
|
|
|
|
offset += status;
|
|
}
|
|
|
|
if (status < 0)
|
|
{
|
|
WLog_ERR(TAG, "failed to read certificate");
|
|
return -1;
|
|
}
|
|
|
|
length = offset;
|
|
pemCert[length] = '\0';
|
|
|
|
status = -1;
|
|
|
|
if (instance->VerifyX509Certificate)
|
|
{
|
|
status = instance->VerifyX509Certificate(instance, pemCert, length, hostname, port, tls->isGatewayTransport);
|
|
}
|
|
|
|
WLog_ERR(TAG, "(length = %d) status: %d%s", length, status, pemCert);
|
|
|
|
free(pemCert);
|
|
BIO_free(bio);
|
|
|
|
if (status < 0)
|
|
return -1;
|
|
|
|
return (status == 0) ? 0 : 1;
|
|
}
|
|
|
|
/* ignore certificate verification if user explicitly required it (discouraged) */
|
|
if (tls->settings->IgnoreCertificate)
|
|
return 1; /* success! */
|
|
|
|
/* if user explicitly specified a certificate name, use it instead of the hostname */
|
|
if (tls->settings->CertificateName)
|
|
hostname = tls->settings->CertificateName;
|
|
|
|
/* attempt verification using OpenSSL and the ~/.freerdp/certs certificate store */
|
|
certificate_status = x509_verify_certificate(cert, tls->certificate_store->path);
|
|
|
|
/* verify certificate name match */
|
|
certificate_data = crypto_get_certificate_data(cert->px509, hostname, port);
|
|
|
|
/* extra common name and alternative names */
|
|
common_name = crypto_cert_subject_common_name(cert->px509, &common_name_length);
|
|
alt_names = crypto_cert_subject_alt_name(cert->px509, &alt_names_count, &alt_names_lengths);
|
|
|
|
/* compare against common name */
|
|
|
|
if (common_name)
|
|
{
|
|
if (tls_match_hostname(common_name, common_name_length, hostname))
|
|
hostname_match = TRUE;
|
|
}
|
|
|
|
/* compare against alternative names */
|
|
|
|
if (alt_names)
|
|
{
|
|
for (index = 0; index < alt_names_count; index++)
|
|
{
|
|
if (tls_match_hostname(alt_names[index], alt_names_lengths[index], hostname))
|
|
{
|
|
hostname_match = TRUE;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* if the certificate is valid and the certificate name matches, verification succeeds */
|
|
if (certificate_status && hostname_match)
|
|
{
|
|
if (common_name)
|
|
{
|
|
free(common_name);
|
|
common_name = NULL;
|
|
}
|
|
|
|
verification_status = TRUE; /* success! */
|
|
}
|
|
|
|
/* if the certificate is valid but the certificate name does not match, warn user, do not accept */
|
|
if (certificate_status && !hostname_match)
|
|
tls_print_certificate_name_mismatch_error(hostname, port,
|
|
common_name, alt_names,
|
|
alt_names_count);
|
|
|
|
/* verification could not succeed with OpenSSL, use known_hosts file and prompt user for manual verification */
|
|
|
|
if (!certificate_status)
|
|
{
|
|
char* issuer;
|
|
char* subject;
|
|
char* fingerprint;
|
|
freerdp* instance = (freerdp*) tls->settings->instance;
|
|
BOOL accept_certificate = FALSE;
|
|
|
|
issuer = crypto_cert_issuer(cert->px509);
|
|
subject = crypto_cert_subject(cert->px509);
|
|
fingerprint = crypto_cert_fingerprint(cert->px509);
|
|
|
|
/* search for matching entry in known_hosts file */
|
|
match = certificate_data_match(tls->certificate_store, certificate_data);
|
|
|
|
if (match == 1)
|
|
{
|
|
/* no entry was found in known_hosts file, prompt user for manual verification */
|
|
if (!hostname_match)
|
|
tls_print_certificate_name_mismatch_error(
|
|
hostname, port,
|
|
common_name, alt_names,
|
|
alt_names_count);
|
|
|
|
if (instance->VerifyCertificate)
|
|
{
|
|
accept_certificate = instance->VerifyCertificate(instance, subject, issuer, fingerprint);
|
|
}
|
|
|
|
if (!accept_certificate)
|
|
{
|
|
/* user did not accept, abort and do not add entry in known_hosts file */
|
|
verification_status = FALSE; /* failure! */
|
|
}
|
|
else
|
|
{
|
|
/* user accepted certificate, add entry in known_hosts file */
|
|
verification_status = certificate_data_print(tls->certificate_store, certificate_data);
|
|
}
|
|
}
|
|
else if (match == -1)
|
|
{
|
|
char* old_subject = NULL;
|
|
char* old_issuer = NULL;
|
|
char* old_fingerprint = NULL;
|
|
|
|
/* entry was found in known_hosts file, but fingerprint does not match. ask user to use it */
|
|
tls_print_certificate_error(hostname, port, fingerprint,
|
|
tls->certificate_store->file);
|
|
|
|
if (!certificate_get_stored_data(tls->certificate_store,
|
|
certificate_data, &old_subject,
|
|
&old_issuer, &old_fingerprint))
|
|
WLog_WARN(TAG, "Failed to get certificate entry for %s:hu",
|
|
hostname, port);
|
|
|
|
if (instance->VerifyChangedCertificate)
|
|
{
|
|
accept_certificate = instance->VerifyChangedCertificate(
|
|
instance, subject, issuer,
|
|
fingerprint, old_subject, old_issuer,
|
|
old_fingerprint);
|
|
}
|
|
|
|
free(old_fingerprint);
|
|
|
|
if (!accept_certificate)
|
|
{
|
|
/* user did not accept, abort and do not change known_hosts file */
|
|
verification_status = FALSE; /* failure! */
|
|
}
|
|
else
|
|
{
|
|
/* user accepted new certificate, add replace fingerprint for this host in known_hosts file */
|
|
verification_status = certificate_data_replace(tls->certificate_store, certificate_data);
|
|
}
|
|
}
|
|
else if (match == 0)
|
|
{
|
|
verification_status = TRUE; /* success! */
|
|
}
|
|
|
|
free(issuer);
|
|
free(subject);
|
|
free(fingerprint);
|
|
}
|
|
|
|
if (certificate_data)
|
|
{
|
|
free(certificate_data->fingerprint);
|
|
free(certificate_data->hostname);
|
|
free(certificate_data);
|
|
}
|
|
|
|
#ifndef _WIN32
|
|
free(common_name);
|
|
#endif
|
|
|
|
if (alt_names)
|
|
crypto_cert_subject_alt_name_free(alt_names_count, alt_names_lengths,
|
|
alt_names);
|
|
|
|
return (verification_status == 0) ? 0 : 1;
|
|
}
|
|
|
|
void tls_print_certificate_error(char* hostname, UINT16 port, char* fingerprint,
|
|
char *hosts_file)
|
|
{
|
|
WLog_ERR(TAG, "The host key for %s:%hu has changed", hostname, port);
|
|
WLog_ERR(TAG, "@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
|
|
WLog_ERR(TAG, "@ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! @");
|
|
WLog_ERR(TAG, "@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
|
|
WLog_ERR(TAG, "IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!");
|
|
WLog_ERR(TAG, "Someone could be eavesdropping on you right now (man-in-the-middle attack)!");
|
|
WLog_ERR(TAG, "It is also possible that a host key has just been changed.");
|
|
WLog_ERR(TAG, "The fingerprint for the host key sent by the remote host is%s", fingerprint);
|
|
WLog_ERR(TAG, "Please contact your system administrator.");
|
|
WLog_ERR(TAG, "Add correct host key in %s to get rid of this message.", hosts_file);
|
|
WLog_ERR(TAG, "Host key for %s has changed and you have requested strict checking.", hostname);
|
|
WLog_ERR(TAG, "Host key verification failed.");
|
|
}
|
|
|
|
void tls_print_certificate_name_mismatch_error(char* hostname, UINT16 port,
|
|
char* common_name, char** alt_names,
|
|
int alt_names_count)
|
|
{
|
|
int index;
|
|
|
|
assert(NULL != hostname);
|
|
WLog_ERR(TAG, "@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
|
|
WLog_ERR(TAG, "@ WARNING: CERTIFICATE NAME MISMATCH! @");
|
|
WLog_ERR(TAG, "@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
|
|
WLog_ERR(TAG, "The hostname used for this connection (%s:%hu) ",
|
|
hostname, port);
|
|
WLog_ERR(TAG, "does not match %s given in the certificate:",
|
|
alt_names_count < 1 ? "the name" : "any of the names");
|
|
WLog_ERR(TAG, "Common Name (CN):");
|
|
WLog_ERR(TAG, "\t%s", common_name ? common_name : "no CN found in certificate");
|
|
if (alt_names_count > 0)
|
|
{
|
|
assert(NULL != alt_names);
|
|
WLog_ERR(TAG, "Alternative names:");
|
|
for (index = 0; index < alt_names_count; index++)
|
|
{
|
|
assert(alt_names[index]);
|
|
WLog_ERR(TAG, "\t %s", alt_names[index]);
|
|
}
|
|
}
|
|
WLog_ERR(TAG, "A valid certificate for the wrong name should NOT be trusted!");
|
|
}
|
|
|
|
rdpTls* tls_new(rdpSettings* settings)
|
|
{
|
|
rdpTls* tls;
|
|
|
|
tls = (rdpTls*) calloc(1, sizeof(rdpTls));
|
|
|
|
if (!tls)
|
|
return NULL;
|
|
|
|
winpr_InitializeSSL(WINPR_SSL_INIT_DEFAULT);
|
|
|
|
tls->settings = settings;
|
|
|
|
if (!settings->ServerMode)
|
|
{
|
|
tls->certificate_store = certificate_store_new(settings);
|
|
|
|
if (!tls->certificate_store)
|
|
goto out_free;
|
|
}
|
|
|
|
tls->alertLevel = TLS_ALERT_LEVEL_WARNING;
|
|
tls->alertDescription = TLS_ALERT_DESCRIPTION_CLOSE_NOTIFY;
|
|
|
|
return tls;
|
|
|
|
out_free:
|
|
free(tls);
|
|
return NULL;
|
|
}
|
|
|
|
void tls_free(rdpTls* tls)
|
|
{
|
|
if (!tls)
|
|
return;
|
|
|
|
if (tls->ctx)
|
|
{
|
|
SSL_CTX_free(tls->ctx);
|
|
tls->ctx = NULL;
|
|
}
|
|
|
|
if (tls->bio)
|
|
{
|
|
BIO_free(tls->bio);
|
|
tls->bio = NULL;
|
|
}
|
|
|
|
if (tls->underlying)
|
|
{
|
|
BIO_free(tls->underlying);
|
|
tls->underlying = NULL;
|
|
}
|
|
|
|
if (tls->PublicKey)
|
|
{
|
|
free(tls->PublicKey);
|
|
tls->PublicKey = NULL;
|
|
}
|
|
|
|
if (tls->Bindings)
|
|
{
|
|
free(tls->Bindings->Bindings);
|
|
free(tls->Bindings);
|
|
tls->Bindings = NULL;
|
|
}
|
|
|
|
if (tls->certificate_store)
|
|
{
|
|
certificate_store_free(tls->certificate_store);
|
|
tls->certificate_store = NULL;
|
|
}
|
|
|
|
free(tls);
|
|
}
|