613 lines
15 KiB
C
613 lines
15 KiB
C
/**
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* WinPR: Windows Portable Runtime
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* Schannel Security Package (OpenSSL)
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*
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* Copyright 2012-2014 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 "schannel_openssl.h"
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#ifdef WITH_OPENSSL
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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/print.h>
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#include <winpr/crypto.h>
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#include <openssl/ssl.h>
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#include <openssl/err.h>
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#include <openssl/bio.h>
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struct _SCHANNEL_OPENSSL
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{
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SSL* ssl;
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SSL_CTX* ctx;
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BOOL connected;
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BIO* bioRead;
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BIO* bioWrite;
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BYTE* ReadBuffer;
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BYTE* WriteBuffer;
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};
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#include "../../log.h"
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#define TAG WINPR_TAG("sspi.schannel")
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static char* openssl_get_ssl_error_string(int ssl_error)
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{
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switch (ssl_error)
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{
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case SSL_ERROR_ZERO_RETURN:
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return "SSL_ERROR_ZERO_RETURN";
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case SSL_ERROR_WANT_READ:
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return "SSL_ERROR_WANT_READ";
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case SSL_ERROR_WANT_WRITE:
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return "SSL_ERROR_WANT_WRITE";
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case SSL_ERROR_SYSCALL:
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return "SSL_ERROR_SYSCALL";
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case SSL_ERROR_SSL:
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return "SSL_ERROR_SSL";
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}
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return "SSL_ERROR_UNKNOWN";
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}
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int schannel_openssl_client_init(SCHANNEL_OPENSSL* context)
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{
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int status;
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long options = 0;
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context->ctx = SSL_CTX_new(SSLv23_client_method());
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if (!context->ctx)
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{
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WLog_ERR(TAG, "SSL_CTX_new failed");
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return -1;
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}
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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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#ifdef SSL_OP_NO_COMPRESSION
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options |= SSL_OP_NO_COMPRESSION;
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#endif
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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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SSL_CTX_set_options(context->ctx, options);
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context->ssl = SSL_new(context->ctx);
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if (!context->ssl)
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{
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WLog_ERR(TAG, "SSL_new failed");
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goto out_ssl_new_failed;
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}
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context->bioRead = BIO_new(BIO_s_mem());
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if (!context->bioRead)
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{
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WLog_ERR(TAG, "BIO_new failed");
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goto out_bio_read_failed;
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}
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status = BIO_set_write_buf_size(context->bioRead, SCHANNEL_CB_MAX_TOKEN);
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if (status != 1)
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{
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WLog_ERR(TAG, "BIO_set_write_buf_size on bioRead failed");
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goto out_set_write_buf_read;
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}
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context->bioWrite = BIO_new(BIO_s_mem());
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if (!context->bioWrite)
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{
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WLog_ERR(TAG, "BIO_new failed");
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goto out_bio_write_failed;
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}
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status = BIO_set_write_buf_size(context->bioWrite, SCHANNEL_CB_MAX_TOKEN);
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if (status != 1)
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{
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WLog_ERR(TAG, "BIO_set_write_buf_size on bioWrite failed");
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goto out_set_write_buf_write;
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}
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status = BIO_make_bio_pair(context->bioRead, context->bioWrite);
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if (status != 1)
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{
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WLog_ERR(TAG, "BIO_make_bio_pair failed");
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goto out_bio_pair;
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}
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SSL_set_bio(context->ssl, context->bioRead, context->bioWrite);
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context->ReadBuffer = (BYTE*)malloc(SCHANNEL_CB_MAX_TOKEN);
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if (!context->ReadBuffer)
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{
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WLog_ERR(TAG, "Failed to allocate ReadBuffer");
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goto out_read_alloc;
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}
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context->WriteBuffer = (BYTE*)malloc(SCHANNEL_CB_MAX_TOKEN);
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if (!context->WriteBuffer)
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{
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WLog_ERR(TAG, "Failed to allocate ReadBuffer");
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goto out_write_alloc;
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}
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return 0;
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out_write_alloc:
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free(context->ReadBuffer);
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out_read_alloc:
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out_bio_pair:
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out_set_write_buf_write:
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BIO_free_all(context->bioWrite);
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out_bio_write_failed:
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out_set_write_buf_read:
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BIO_free_all(context->bioRead);
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out_bio_read_failed:
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SSL_free(context->ssl);
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out_ssl_new_failed:
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SSL_CTX_free(context->ctx);
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return -1;
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}
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int schannel_openssl_server_init(SCHANNEL_OPENSSL* context)
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{
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int status;
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long options = 0;
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context->ctx = SSL_CTX_new(SSLv23_server_method());
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if (!context->ctx)
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{
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WLog_ERR(TAG, "SSL_CTX_new failed");
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return -1;
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}
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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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#ifdef SSL_OP_NO_COMPRESSION
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options |= SSL_OP_NO_COMPRESSION;
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#endif
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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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SSL_CTX_set_options(context->ctx, options);
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if (SSL_CTX_use_RSAPrivateKey_file(context->ctx, "/tmp/localhost.key", SSL_FILETYPE_PEM) <= 0)
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{
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WLog_ERR(TAG, "SSL_CTX_use_RSAPrivateKey_file failed");
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goto out_rsa_key;
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}
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context->ssl = SSL_new(context->ctx);
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if (!context->ssl)
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{
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WLog_ERR(TAG, "SSL_new failed");
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goto out_ssl_new;
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}
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if (SSL_use_certificate_file(context->ssl, "/tmp/localhost.crt", SSL_FILETYPE_PEM) <= 0)
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{
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WLog_ERR(TAG, "SSL_use_certificate_file failed");
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goto out_use_certificate;
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}
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context->bioRead = BIO_new(BIO_s_mem());
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if (!context->bioRead)
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{
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WLog_ERR(TAG, "BIO_new failed");
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goto out_bio_read;
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}
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status = BIO_set_write_buf_size(context->bioRead, SCHANNEL_CB_MAX_TOKEN);
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if (status != 1)
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{
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WLog_ERR(TAG, "BIO_set_write_buf_size failed for bioRead");
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goto out_set_write_buf_read;
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}
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context->bioWrite = BIO_new(BIO_s_mem());
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if (!context->bioWrite)
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{
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WLog_ERR(TAG, "BIO_new failed");
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goto out_bio_write;
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}
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status = BIO_set_write_buf_size(context->bioWrite, SCHANNEL_CB_MAX_TOKEN);
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if (status != 1)
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{
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WLog_ERR(TAG, "BIO_set_write_buf_size failed for bioWrite");
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goto out_set_write_buf_write;
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}
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status = BIO_make_bio_pair(context->bioRead, context->bioWrite);
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if (status != 1)
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{
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WLog_ERR(TAG, "BIO_make_bio_pair failed");
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goto out_bio_pair;
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}
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SSL_set_bio(context->ssl, context->bioRead, context->bioWrite);
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context->ReadBuffer = (BYTE*)malloc(SCHANNEL_CB_MAX_TOKEN);
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if (!context->ReadBuffer)
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{
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WLog_ERR(TAG, "Failed to allocate memory for ReadBuffer");
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goto out_read_buffer;
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}
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context->WriteBuffer = (BYTE*)malloc(SCHANNEL_CB_MAX_TOKEN);
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if (!context->WriteBuffer)
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{
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WLog_ERR(TAG, "Failed to allocate memory for WriteBuffer");
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goto out_write_buffer;
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}
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return 0;
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out_write_buffer:
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free(context->ReadBuffer);
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out_read_buffer:
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out_bio_pair:
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out_set_write_buf_write:
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BIO_free_all(context->bioWrite);
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out_bio_write:
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out_set_write_buf_read:
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BIO_free_all(context->bioRead);
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out_bio_read:
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out_use_certificate:
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SSL_free(context->ssl);
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out_ssl_new:
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out_rsa_key:
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SSL_CTX_free(context->ctx);
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return -1;
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}
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SECURITY_STATUS schannel_openssl_client_process_tokens(SCHANNEL_OPENSSL* context,
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PSecBufferDesc pInput,
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PSecBufferDesc pOutput)
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{
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int status;
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int ssl_error;
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PSecBuffer pBuffer;
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if (!context->connected)
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{
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if (pInput)
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{
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if (pInput->cBuffers < 1)
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return SEC_E_INVALID_TOKEN;
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pBuffer = sspi_FindSecBuffer(pInput, SECBUFFER_TOKEN);
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if (!pBuffer)
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return SEC_E_INVALID_TOKEN;
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status = BIO_write(context->bioRead, pBuffer->pvBuffer, pBuffer->cbBuffer);
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}
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status = SSL_connect(context->ssl);
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if (status < 0)
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{
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ssl_error = SSL_get_error(context->ssl, status);
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WLog_ERR(TAG, "SSL_connect error: %s", openssl_get_ssl_error_string(ssl_error));
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}
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if (status == 1)
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context->connected = TRUE;
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status = BIO_read(context->bioWrite, context->ReadBuffer, SCHANNEL_CB_MAX_TOKEN);
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if (pOutput->cBuffers < 1)
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return SEC_E_INVALID_TOKEN;
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pBuffer = sspi_FindSecBuffer(pOutput, SECBUFFER_TOKEN);
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if (!pBuffer)
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return SEC_E_INVALID_TOKEN;
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if (status > 0)
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{
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if (pBuffer->cbBuffer < (unsigned long)status)
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return SEC_E_INSUFFICIENT_MEMORY;
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CopyMemory(pBuffer->pvBuffer, context->ReadBuffer, status);
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pBuffer->cbBuffer = status;
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return (context->connected) ? SEC_E_OK : SEC_I_CONTINUE_NEEDED;
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}
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else
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{
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pBuffer->cbBuffer = 0;
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return (context->connected) ? SEC_E_OK : SEC_I_CONTINUE_NEEDED;
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}
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}
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return SEC_E_OK;
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}
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SECURITY_STATUS schannel_openssl_server_process_tokens(SCHANNEL_OPENSSL* context,
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PSecBufferDesc pInput,
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PSecBufferDesc pOutput)
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{
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int status;
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int ssl_error;
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PSecBuffer pBuffer;
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if (!context->connected)
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{
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if (pInput->cBuffers < 1)
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return SEC_E_INVALID_TOKEN;
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pBuffer = sspi_FindSecBuffer(pInput, SECBUFFER_TOKEN);
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if (!pBuffer)
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return SEC_E_INVALID_TOKEN;
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status = BIO_write(context->bioRead, pBuffer->pvBuffer, pBuffer->cbBuffer);
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status = SSL_accept(context->ssl);
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if (status < 0)
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{
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ssl_error = SSL_get_error(context->ssl, status);
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WLog_ERR(TAG, "SSL_accept error: %s", openssl_get_ssl_error_string(ssl_error));
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}
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if (status == 1)
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context->connected = TRUE;
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status = BIO_read(context->bioWrite, context->ReadBuffer, SCHANNEL_CB_MAX_TOKEN);
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if (pOutput->cBuffers < 1)
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return SEC_E_INVALID_TOKEN;
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pBuffer = sspi_FindSecBuffer(pOutput, SECBUFFER_TOKEN);
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if (!pBuffer)
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return SEC_E_INVALID_TOKEN;
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if (status > 0)
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{
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if (pBuffer->cbBuffer < (unsigned long)status)
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return SEC_E_INSUFFICIENT_MEMORY;
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CopyMemory(pBuffer->pvBuffer, context->ReadBuffer, status);
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pBuffer->cbBuffer = status;
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return (context->connected) ? SEC_E_OK : SEC_I_CONTINUE_NEEDED;
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}
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else
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{
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pBuffer->cbBuffer = 0;
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return (context->connected) ? SEC_E_OK : SEC_I_CONTINUE_NEEDED;
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}
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}
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return SEC_E_OK;
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}
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SECURITY_STATUS schannel_openssl_encrypt_message(SCHANNEL_OPENSSL* context, PSecBufferDesc pMessage)
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{
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int status;
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int ssl_error;
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PSecBuffer pStreamBodyBuffer;
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PSecBuffer pStreamHeaderBuffer;
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PSecBuffer pStreamTrailerBuffer;
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pStreamHeaderBuffer = sspi_FindSecBuffer(pMessage, SECBUFFER_STREAM_HEADER);
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pStreamBodyBuffer = sspi_FindSecBuffer(pMessage, SECBUFFER_DATA);
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pStreamTrailerBuffer = sspi_FindSecBuffer(pMessage, SECBUFFER_STREAM_TRAILER);
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if ((!pStreamHeaderBuffer) || (!pStreamBodyBuffer) || (!pStreamTrailerBuffer))
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return SEC_E_INVALID_TOKEN;
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status = SSL_write(context->ssl, pStreamBodyBuffer->pvBuffer, pStreamBodyBuffer->cbBuffer);
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if (status < 0)
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{
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ssl_error = SSL_get_error(context->ssl, status);
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WLog_ERR(TAG, "SSL_write: %s", openssl_get_ssl_error_string(ssl_error));
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}
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status = BIO_read(context->bioWrite, context->ReadBuffer, SCHANNEL_CB_MAX_TOKEN);
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if (status > 0)
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{
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size_t ustatus = (size_t)status;
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size_t length;
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size_t offset = 0;
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length =
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(pStreamHeaderBuffer->cbBuffer > ustatus) ? ustatus : pStreamHeaderBuffer->cbBuffer;
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CopyMemory(pStreamHeaderBuffer->pvBuffer, &context->ReadBuffer[offset], length);
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ustatus -= length;
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offset += length;
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length = (pStreamBodyBuffer->cbBuffer > ustatus) ? ustatus : pStreamBodyBuffer->cbBuffer;
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CopyMemory(pStreamBodyBuffer->pvBuffer, &context->ReadBuffer[offset], length);
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ustatus -= length;
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offset += length;
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length =
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(pStreamTrailerBuffer->cbBuffer > ustatus) ? ustatus : pStreamTrailerBuffer->cbBuffer;
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CopyMemory(pStreamTrailerBuffer->pvBuffer, &context->ReadBuffer[offset], length);
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}
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return SEC_E_OK;
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}
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SECURITY_STATUS schannel_openssl_decrypt_message(SCHANNEL_OPENSSL* context, PSecBufferDesc pMessage)
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{
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int status;
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int length;
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BYTE* buffer;
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int ssl_error;
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PSecBuffer pBuffer;
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pBuffer = sspi_FindSecBuffer(pMessage, SECBUFFER_DATA);
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if (!pBuffer)
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return SEC_E_INVALID_TOKEN;
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status = BIO_write(context->bioRead, pBuffer->pvBuffer, pBuffer->cbBuffer);
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status = SSL_read(context->ssl, pBuffer->pvBuffer, pBuffer->cbBuffer);
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if (status < 0)
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{
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ssl_error = SSL_get_error(context->ssl, status);
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WLog_ERR(TAG, "SSL_read: %s", openssl_get_ssl_error_string(ssl_error));
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}
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length = status;
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buffer = pBuffer->pvBuffer;
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pMessage->pBuffers[0].BufferType = SECBUFFER_STREAM_HEADER;
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pMessage->pBuffers[0].cbBuffer = 5;
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pMessage->pBuffers[1].BufferType = SECBUFFER_DATA;
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pMessage->pBuffers[1].pvBuffer = buffer;
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pMessage->pBuffers[1].cbBuffer = length;
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pMessage->pBuffers[2].BufferType = SECBUFFER_STREAM_TRAILER;
|
|
pMessage->pBuffers[2].cbBuffer = 36;
|
|
pMessage->pBuffers[3].BufferType = SECBUFFER_EMPTY;
|
|
pMessage->pBuffers[3].cbBuffer = 0;
|
|
return SEC_E_OK;
|
|
}
|
|
|
|
SCHANNEL_OPENSSL* schannel_openssl_new()
|
|
{
|
|
SCHANNEL_OPENSSL* context;
|
|
context = (SCHANNEL_OPENSSL*)calloc(1, sizeof(SCHANNEL_OPENSSL));
|
|
|
|
if (context != NULL)
|
|
{
|
|
winpr_InitializeSSL(WINPR_SSL_INIT_DEFAULT);
|
|
context->connected = FALSE;
|
|
}
|
|
|
|
return context;
|
|
}
|
|
|
|
void schannel_openssl_free(SCHANNEL_OPENSSL* context)
|
|
{
|
|
if (context)
|
|
{
|
|
free(context->ReadBuffer);
|
|
free(context->WriteBuffer);
|
|
free(context);
|
|
}
|
|
}
|
|
|
|
#else
|
|
|
|
int schannel_openssl_client_init(SCHANNEL_OPENSSL* context)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
int schannel_openssl_server_init(SCHANNEL_OPENSSL* context)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
SECURITY_STATUS schannel_openssl_client_process_tokens(SCHANNEL_OPENSSL* context,
|
|
PSecBufferDesc pInput,
|
|
PSecBufferDesc pOutput)
|
|
{
|
|
return SEC_E_OK;
|
|
}
|
|
|
|
SECURITY_STATUS schannel_openssl_server_process_tokens(SCHANNEL_OPENSSL* context,
|
|
PSecBufferDesc pInput,
|
|
PSecBufferDesc pOutput)
|
|
{
|
|
return SEC_E_OK;
|
|
}
|
|
|
|
SECURITY_STATUS schannel_openssl_encrypt_message(SCHANNEL_OPENSSL* context, PSecBufferDesc pMessage)
|
|
{
|
|
return SEC_E_OK;
|
|
}
|
|
|
|
SECURITY_STATUS schannel_openssl_decrypt_message(SCHANNEL_OPENSSL* context, PSecBufferDesc pMessage)
|
|
{
|
|
return SEC_E_OK;
|
|
}
|
|
|
|
SCHANNEL_OPENSSL* schannel_openssl_new(void)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
void schannel_openssl_free(SCHANNEL_OPENSSL* context)
|
|
{
|
|
}
|
|
|
|
#endif
|