freerdp/winpr/libwinpr/sspi/Schannel/schannel_openssl.c

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2023-05-09 21:29:50 +00:00
/**
* WinPR: Windows Portable Runtime
* Schannel Security Package (OpenSSL)
*
* Copyright 2012-2014 Marc-Andre Moreau <marcandre.moreau@gmail.com>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "schannel_openssl.h"
#ifdef WITH_OPENSSL
#include <winpr/crt.h>
#include <winpr/sspi.h>
#include <winpr/ssl.h>
#include <winpr/print.h>
#include <winpr/crypto.h>
#include <openssl/ssl.h>
#include <openssl/err.h>
#include <openssl/bio.h>
struct _SCHANNEL_OPENSSL
{
SSL* ssl;
SSL_CTX* ctx;
BOOL connected;
BIO* bioRead;
BIO* bioWrite;
BYTE* ReadBuffer;
BYTE* WriteBuffer;
};
#include "../../log.h"
#define TAG WINPR_TAG("sspi.schannel")
static char* openssl_get_ssl_error_string(int ssl_error)
{
switch (ssl_error)
{
case SSL_ERROR_ZERO_RETURN:
return "SSL_ERROR_ZERO_RETURN";
case SSL_ERROR_WANT_READ:
return "SSL_ERROR_WANT_READ";
case SSL_ERROR_WANT_WRITE:
return "SSL_ERROR_WANT_WRITE";
case SSL_ERROR_SYSCALL:
return "SSL_ERROR_SYSCALL";
case SSL_ERROR_SSL:
return "SSL_ERROR_SSL";
}
return "SSL_ERROR_UNKNOWN";
}
int schannel_openssl_client_init(SCHANNEL_OPENSSL* context)
{
int status;
long options = 0;
context->ctx = SSL_CTX_new(SSLv23_client_method());
if (!context->ctx)
{
WLog_ERR(TAG, "SSL_CTX_new failed");
return -1;
}
/**
* 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;
SSL_CTX_set_options(context->ctx, options);
context->ssl = SSL_new(context->ctx);
if (!context->ssl)
{
WLog_ERR(TAG, "SSL_new failed");
goto out_ssl_new_failed;
}
context->bioRead = BIO_new(BIO_s_mem());
if (!context->bioRead)
{
WLog_ERR(TAG, "BIO_new failed");
goto out_bio_read_failed;
}
status = BIO_set_write_buf_size(context->bioRead, SCHANNEL_CB_MAX_TOKEN);
if (status != 1)
{
WLog_ERR(TAG, "BIO_set_write_buf_size on bioRead failed");
goto out_set_write_buf_read;
}
context->bioWrite = BIO_new(BIO_s_mem());
if (!context->bioWrite)
{
WLog_ERR(TAG, "BIO_new failed");
goto out_bio_write_failed;
}
status = BIO_set_write_buf_size(context->bioWrite, SCHANNEL_CB_MAX_TOKEN);
if (status != 1)
{
WLog_ERR(TAG, "BIO_set_write_buf_size on bioWrite failed");
goto out_set_write_buf_write;
}
status = BIO_make_bio_pair(context->bioRead, context->bioWrite);
if (status != 1)
{
WLog_ERR(TAG, "BIO_make_bio_pair failed");
goto out_bio_pair;
}
SSL_set_bio(context->ssl, context->bioRead, context->bioWrite);
context->ReadBuffer = (BYTE*)malloc(SCHANNEL_CB_MAX_TOKEN);
if (!context->ReadBuffer)
{
WLog_ERR(TAG, "Failed to allocate ReadBuffer");
goto out_read_alloc;
}
context->WriteBuffer = (BYTE*)malloc(SCHANNEL_CB_MAX_TOKEN);
if (!context->WriteBuffer)
{
WLog_ERR(TAG, "Failed to allocate ReadBuffer");
goto out_write_alloc;
}
return 0;
out_write_alloc:
free(context->ReadBuffer);
out_read_alloc:
out_bio_pair:
out_set_write_buf_write:
BIO_free_all(context->bioWrite);
out_bio_write_failed:
out_set_write_buf_read:
BIO_free_all(context->bioRead);
out_bio_read_failed:
SSL_free(context->ssl);
out_ssl_new_failed:
SSL_CTX_free(context->ctx);
return -1;
}
int schannel_openssl_server_init(SCHANNEL_OPENSSL* context)
{
int status;
long options = 0;
context->ctx = SSL_CTX_new(SSLv23_server_method());
if (!context->ctx)
{
WLog_ERR(TAG, "SSL_CTX_new failed");
return -1;
}
/*
* 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;
SSL_CTX_set_options(context->ctx, options);
if (SSL_CTX_use_RSAPrivateKey_file(context->ctx, "/tmp/localhost.key", SSL_FILETYPE_PEM) <= 0)
{
WLog_ERR(TAG, "SSL_CTX_use_RSAPrivateKey_file failed");
goto out_rsa_key;
}
context->ssl = SSL_new(context->ctx);
if (!context->ssl)
{
WLog_ERR(TAG, "SSL_new failed");
goto out_ssl_new;
}
if (SSL_use_certificate_file(context->ssl, "/tmp/localhost.crt", SSL_FILETYPE_PEM) <= 0)
{
WLog_ERR(TAG, "SSL_use_certificate_file failed");
goto out_use_certificate;
}
context->bioRead = BIO_new(BIO_s_mem());
if (!context->bioRead)
{
WLog_ERR(TAG, "BIO_new failed");
goto out_bio_read;
}
status = BIO_set_write_buf_size(context->bioRead, SCHANNEL_CB_MAX_TOKEN);
if (status != 1)
{
WLog_ERR(TAG, "BIO_set_write_buf_size failed for bioRead");
goto out_set_write_buf_read;
}
context->bioWrite = BIO_new(BIO_s_mem());
if (!context->bioWrite)
{
WLog_ERR(TAG, "BIO_new failed");
goto out_bio_write;
}
status = BIO_set_write_buf_size(context->bioWrite, SCHANNEL_CB_MAX_TOKEN);
if (status != 1)
{
WLog_ERR(TAG, "BIO_set_write_buf_size failed for bioWrite");
goto out_set_write_buf_write;
}
status = BIO_make_bio_pair(context->bioRead, context->bioWrite);
if (status != 1)
{
WLog_ERR(TAG, "BIO_make_bio_pair failed");
goto out_bio_pair;
}
SSL_set_bio(context->ssl, context->bioRead, context->bioWrite);
context->ReadBuffer = (BYTE*)malloc(SCHANNEL_CB_MAX_TOKEN);
if (!context->ReadBuffer)
{
WLog_ERR(TAG, "Failed to allocate memory for ReadBuffer");
goto out_read_buffer;
}
context->WriteBuffer = (BYTE*)malloc(SCHANNEL_CB_MAX_TOKEN);
if (!context->WriteBuffer)
{
WLog_ERR(TAG, "Failed to allocate memory for WriteBuffer");
goto out_write_buffer;
}
return 0;
out_write_buffer:
free(context->ReadBuffer);
out_read_buffer:
out_bio_pair:
out_set_write_buf_write:
BIO_free_all(context->bioWrite);
out_bio_write:
out_set_write_buf_read:
BIO_free_all(context->bioRead);
out_bio_read:
out_use_certificate:
SSL_free(context->ssl);
out_ssl_new:
out_rsa_key:
SSL_CTX_free(context->ctx);
return -1;
}
SECURITY_STATUS schannel_openssl_client_process_tokens(SCHANNEL_OPENSSL* context,
PSecBufferDesc pInput,
PSecBufferDesc pOutput)
{
int status;
int ssl_error;
PSecBuffer pBuffer;
if (!context->connected)
{
if (pInput)
{
if (pInput->cBuffers < 1)
return SEC_E_INVALID_TOKEN;
pBuffer = sspi_FindSecBuffer(pInput, SECBUFFER_TOKEN);
if (!pBuffer)
return SEC_E_INVALID_TOKEN;
status = BIO_write(context->bioRead, pBuffer->pvBuffer, pBuffer->cbBuffer);
}
status = SSL_connect(context->ssl);
if (status < 0)
{
ssl_error = SSL_get_error(context->ssl, status);
WLog_ERR(TAG, "SSL_connect error: %s", openssl_get_ssl_error_string(ssl_error));
}
if (status == 1)
context->connected = TRUE;
status = BIO_read(context->bioWrite, context->ReadBuffer, SCHANNEL_CB_MAX_TOKEN);
if (pOutput->cBuffers < 1)
return SEC_E_INVALID_TOKEN;
pBuffer = sspi_FindSecBuffer(pOutput, SECBUFFER_TOKEN);
if (!pBuffer)
return SEC_E_INVALID_TOKEN;
if (status > 0)
{
if (pBuffer->cbBuffer < (unsigned long)status)
return SEC_E_INSUFFICIENT_MEMORY;
CopyMemory(pBuffer->pvBuffer, context->ReadBuffer, status);
pBuffer->cbBuffer = status;
return (context->connected) ? SEC_E_OK : SEC_I_CONTINUE_NEEDED;
}
else
{
pBuffer->cbBuffer = 0;
return (context->connected) ? SEC_E_OK : SEC_I_CONTINUE_NEEDED;
}
}
return SEC_E_OK;
}
SECURITY_STATUS schannel_openssl_server_process_tokens(SCHANNEL_OPENSSL* context,
PSecBufferDesc pInput,
PSecBufferDesc pOutput)
{
int status;
int ssl_error;
PSecBuffer pBuffer;
if (!context->connected)
{
if (pInput->cBuffers < 1)
return SEC_E_INVALID_TOKEN;
pBuffer = sspi_FindSecBuffer(pInput, SECBUFFER_TOKEN);
if (!pBuffer)
return SEC_E_INVALID_TOKEN;
status = BIO_write(context->bioRead, pBuffer->pvBuffer, pBuffer->cbBuffer);
status = SSL_accept(context->ssl);
if (status < 0)
{
ssl_error = SSL_get_error(context->ssl, status);
WLog_ERR(TAG, "SSL_accept error: %s", openssl_get_ssl_error_string(ssl_error));
}
if (status == 1)
context->connected = TRUE;
status = BIO_read(context->bioWrite, context->ReadBuffer, SCHANNEL_CB_MAX_TOKEN);
if (pOutput->cBuffers < 1)
return SEC_E_INVALID_TOKEN;
pBuffer = sspi_FindSecBuffer(pOutput, SECBUFFER_TOKEN);
if (!pBuffer)
return SEC_E_INVALID_TOKEN;
if (status > 0)
{
if (pBuffer->cbBuffer < (unsigned long)status)
return SEC_E_INSUFFICIENT_MEMORY;
CopyMemory(pBuffer->pvBuffer, context->ReadBuffer, status);
pBuffer->cbBuffer = status;
return (context->connected) ? SEC_E_OK : SEC_I_CONTINUE_NEEDED;
}
else
{
pBuffer->cbBuffer = 0;
return (context->connected) ? SEC_E_OK : SEC_I_CONTINUE_NEEDED;
}
}
return SEC_E_OK;
}
SECURITY_STATUS schannel_openssl_encrypt_message(SCHANNEL_OPENSSL* context, PSecBufferDesc pMessage)
{
int status;
int ssl_error;
PSecBuffer pStreamBodyBuffer;
PSecBuffer pStreamHeaderBuffer;
PSecBuffer pStreamTrailerBuffer;
pStreamHeaderBuffer = sspi_FindSecBuffer(pMessage, SECBUFFER_STREAM_HEADER);
pStreamBodyBuffer = sspi_FindSecBuffer(pMessage, SECBUFFER_DATA);
pStreamTrailerBuffer = sspi_FindSecBuffer(pMessage, SECBUFFER_STREAM_TRAILER);
if ((!pStreamHeaderBuffer) || (!pStreamBodyBuffer) || (!pStreamTrailerBuffer))
return SEC_E_INVALID_TOKEN;
status = SSL_write(context->ssl, pStreamBodyBuffer->pvBuffer, pStreamBodyBuffer->cbBuffer);
if (status < 0)
{
ssl_error = SSL_get_error(context->ssl, status);
WLog_ERR(TAG, "SSL_write: %s", openssl_get_ssl_error_string(ssl_error));
}
status = BIO_read(context->bioWrite, context->ReadBuffer, SCHANNEL_CB_MAX_TOKEN);
if (status > 0)
{
size_t ustatus = (size_t)status;
size_t length;
size_t offset = 0;
length =
(pStreamHeaderBuffer->cbBuffer > ustatus) ? ustatus : pStreamHeaderBuffer->cbBuffer;
CopyMemory(pStreamHeaderBuffer->pvBuffer, &context->ReadBuffer[offset], length);
ustatus -= length;
offset += length;
length = (pStreamBodyBuffer->cbBuffer > ustatus) ? ustatus : pStreamBodyBuffer->cbBuffer;
CopyMemory(pStreamBodyBuffer->pvBuffer, &context->ReadBuffer[offset], length);
ustatus -= length;
offset += length;
length =
(pStreamTrailerBuffer->cbBuffer > ustatus) ? ustatus : pStreamTrailerBuffer->cbBuffer;
CopyMemory(pStreamTrailerBuffer->pvBuffer, &context->ReadBuffer[offset], length);
}
return SEC_E_OK;
}
SECURITY_STATUS schannel_openssl_decrypt_message(SCHANNEL_OPENSSL* context, PSecBufferDesc pMessage)
{
int status;
int length;
BYTE* buffer;
int ssl_error;
PSecBuffer pBuffer;
pBuffer = sspi_FindSecBuffer(pMessage, SECBUFFER_DATA);
if (!pBuffer)
return SEC_E_INVALID_TOKEN;
status = BIO_write(context->bioRead, pBuffer->pvBuffer, pBuffer->cbBuffer);
status = SSL_read(context->ssl, pBuffer->pvBuffer, pBuffer->cbBuffer);
if (status < 0)
{
ssl_error = SSL_get_error(context->ssl, status);
WLog_ERR(TAG, "SSL_read: %s", openssl_get_ssl_error_string(ssl_error));
}
length = status;
buffer = pBuffer->pvBuffer;
pMessage->pBuffers[0].BufferType = SECBUFFER_STREAM_HEADER;
pMessage->pBuffers[0].cbBuffer = 5;
pMessage->pBuffers[1].BufferType = SECBUFFER_DATA;
pMessage->pBuffers[1].pvBuffer = buffer;
pMessage->pBuffers[1].cbBuffer = length;
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