/**
 * FreeRDP: A Remote Desktop Protocol Client
 * RPC over HTTP
 *
 * Copyright 2012 Fujitsu Technology Solutions GmbH
 * Copyright 2012 Dmitrij Jasnov <dmitrij.jasnov@ts.fujitsu.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.
 */

#include "config.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include <openssl/rand.h>

#include "http.h"

#include "rpc.h"

#define HTTP_STREAM_SIZE 0xFFFF

boolean rpc_attach(rdpRpc* rpc, rdpTcp* tcp_in, rdpTcp* tcp_out, rdpTls* tls_in, rdpTls* tls_out)
{
	rpc->tcp_in = tcp_in;
	rpc->tcp_out = tcp_out;
	rpc->tls_in = tls_in;
	rpc->tls_out = tls_out;

	return true;
}

#define NTLM_PACKAGE_NAME	_T("NTLM")

boolean ntlm_client_init(rdpNtlm* ntlm, char* user, char* domain, char* password)
{
	size_t size;
	SECURITY_STATUS status;

	sspi_GlobalInit();

	ntlm->table = InitSecurityInterface();

	ntlm->identity.Flags = SEC_WINNT_AUTH_IDENTITY_UNICODE;

	ntlm->identity.User = (uint16*) freerdp_uniconv_out(ntlm->uniconv, user, &size);
	ntlm->identity.UserLength = (uint32) size;

	if (domain)
	{
		ntlm->identity.Domain = (uint16*) freerdp_uniconv_out(ntlm->uniconv, domain, &size);
		ntlm->identity.DomainLength = (uint32) size;
	}
	else
	{
		ntlm->identity.Domain = (uint16*) NULL;
		ntlm->identity.DomainLength = 0;
	}

	ntlm->identity.Password = (uint16*) freerdp_uniconv_out(ntlm->uniconv, (char*) password, &size);
	ntlm->identity.PasswordLength = (uint32) size;

	status = QuerySecurityPackageInfo(NTLM_PACKAGE_NAME, &ntlm->pPackageInfo);

	if (status != SEC_E_OK)
	{
		printf("QuerySecurityPackageInfo status: 0x%08X\n", status);
		return false;
	}

	ntlm->cbMaxToken = ntlm->pPackageInfo->cbMaxToken;

	status = ntlm->table->AcquireCredentialsHandle(NULL, NTLM_PACKAGE_NAME,
			SECPKG_CRED_OUTBOUND, NULL, &ntlm->identity, NULL, NULL, &ntlm->credentials, &ntlm->expiration);

	if (status != SEC_E_OK)
	{
		printf("AcquireCredentialsHandle status: 0x%08X\n", status);
		return false;
	}

	ntlm->haveContext = false;
	ntlm->haveInputBuffer = false;
	memset(&ntlm->inputBuffer, 0, sizeof(SecBuffer));
	memset(&ntlm->outputBuffer, 0, sizeof(SecBuffer));
	memset(&ntlm->ContextSizes, 0, sizeof(SecPkgContext_Sizes));

	ntlm->fContextReq = ISC_REQ_REPLAY_DETECT | ISC_REQ_SEQUENCE_DETECT |
			ISC_REQ_CONFIDENTIALITY | ISC_REQ_DELEGATE;

	return true;
}

boolean ntlm_authenticate(rdpNtlm* ntlm)
{
	SECURITY_STATUS status;

	ntlm->outputBufferDesc.ulVersion = SECBUFFER_VERSION;
	ntlm->outputBufferDesc.cBuffers = 1;
	ntlm->outputBufferDesc.pBuffers = &ntlm->outputBuffer;
	ntlm->outputBuffer.BufferType = SECBUFFER_TOKEN;
	ntlm->outputBuffer.cbBuffer = ntlm->cbMaxToken;
	ntlm->outputBuffer.pvBuffer = xmalloc(ntlm->outputBuffer.cbBuffer);

	if (ntlm->haveInputBuffer)
	{
		ntlm->inputBufferDesc.ulVersion = SECBUFFER_VERSION;
		ntlm->inputBufferDesc.cBuffers = 1;
		ntlm->inputBufferDesc.pBuffers = &ntlm->inputBuffer;
		ntlm->inputBuffer.BufferType = SECBUFFER_TOKEN;
	}

	status = ntlm->table->InitializeSecurityContext(&ntlm->credentials,
			(ntlm->haveContext) ? &ntlm->context : NULL,
			NULL, ntlm->fContextReq, 0, SECURITY_NATIVE_DREP,
			(ntlm->haveInputBuffer) ? &ntlm->inputBufferDesc : NULL,
			0, &ntlm->context, &ntlm->outputBufferDesc,
			&ntlm->pfContextAttr, &ntlm->expiration);

	if ((status == SEC_I_COMPLETE_AND_CONTINUE) || (status == SEC_I_COMPLETE_NEEDED) || (status == SEC_E_OK))
	{
		if (ntlm->table->CompleteAuthToken != NULL)
			ntlm->table->CompleteAuthToken(&ntlm->context, &ntlm->outputBufferDesc);

		if (ntlm->table->QueryContextAttributes(&ntlm->context, SECPKG_ATTR_SIZES, &ntlm->ContextSizes) != SEC_E_OK)
		{
			printf("QueryContextAttributes SECPKG_ATTR_SIZES failure\n");
			return 0;
		}

		if (status == SEC_I_COMPLETE_NEEDED)
			status = SEC_E_OK;
		else if (status == SEC_I_COMPLETE_AND_CONTINUE)
			status = SEC_I_CONTINUE_NEEDED;
	}

	ntlm->haveInputBuffer = true;
	ntlm->haveContext = true;

	return true;
}

void ntlm_client_uninit(rdpNtlm* ntlm)
{
	FreeCredentialsHandle(&ntlm->credentials);
	FreeContextBuffer(ntlm->pPackageInfo);
}

rdpNtlm* ntlm_new()
{
	rdpNtlm* ntlm = xnew(rdpNtlm);

	if (ntlm != NULL)
	{
		ntlm->uniconv = freerdp_uniconv_new();
	}

	return ntlm;
}

void ntlm_free(rdpNtlm* ntlm)
{
	if (ntlm != NULL)
	{
		freerdp_uniconv_free(ntlm->uniconv);
	}
}

STREAM* rpc_ntlm_http_data(rdpRpc* rpc, char* command, SecBuffer* ntlm_token, uint8* content, int length)
{
	STREAM* s;
	char* base64_ntlm_token;
	HttpContext* http_context;
	HttpRequest* http_request;

	base64_ntlm_token = crypto_encode_base64(ntlm_token->pvBuffer, ntlm_token->cbBuffer);

	if (strcmp(command, "RPC_IN_DATA") == 0)
		http_context = rpc->http_in->context;
	else
		http_context = rpc->http_out->context;

	http_request = http_request_new();

	http_request->ContentLength = length;

	http_request_set_method(http_request, http_context->Method);
	http_request_set_uri(http_request, http_context->URI);

	http_request_set_auth_scheme(http_request, "NTLM");
	http_request_set_auth_param(http_request, base64_ntlm_token);

	s = http_request_write(http_context, http_request);

	return s;
}

boolean rpc_out_connect_http(rdpRpc* rpc)
{
	STREAM* s;
	HttpResponse* http_response;
	int ntlm_token_length;
	uint8* ntlm_token_data = NULL;
	rdpTls* tls_out = rpc->tls_out;
	rdpSettings* settings = rpc->settings;
	rdpRpcHTTP* http_out = rpc->http_out;
	rdpNtlm* http_out_ntlm = http_out->ntlm;

	ntlm_client_init(http_out_ntlm, settings->username, settings->domain, settings->password);

	ntlm_authenticate(http_out_ntlm);

	s = rpc_ntlm_http_data(rpc, "RPC_OUT_DATA", &http_out_ntlm->outputBuffer, NULL, 0);

	DEBUG_RPC("\n%s", s->data);
	tls_write_all(tls_out, s->data, s->size);

	http_response = http_response_recv(tls_out);

	crypto_base64_decode((uint8*) http_response->AuthParam, strlen(http_response->AuthParam),
			&ntlm_token_data, &ntlm_token_length);

	http_out_ntlm->inputBuffer.pvBuffer = ntlm_token_data;
	http_out_ntlm->inputBuffer.cbBuffer = ntlm_token_length;

	ntlm_authenticate(http_out_ntlm);

	s = rpc_ntlm_http_data(rpc, "RPC_OUT_DATA", &http_out_ntlm->outputBuffer, NULL, 76);

	DEBUG_RPC("\n%s", s->data);
	tls_write_all(tls_out, s->data, s->size);

	/* At this point OUT connection is ready to send CONN/A1 and start with receiving data */

	http_out->state = RPC_HTTP_SENDING;

	return true;
}

boolean rpc_in_connect_http(rdpRpc* rpc)
{
	STREAM* http_stream;
	HttpResponse* http_response;
	int ntlm_token_length;
	uint8* ntlm_token_data = NULL;
	rdpTls* tls_in = rpc->tls_in;
	rdpSettings* settings = rpc->settings;
	rdpRpcHTTP* http_in = rpc->http_in;
	rdpNtlm* http_in_ntlm = http_in->ntlm;

	ntlm_client_init(http_in_ntlm, settings->username, settings->domain, settings->password);

	ntlm_authenticate(http_in_ntlm);

	http_stream = rpc_ntlm_http_data(rpc, "RPC_IN_DATA", &http_in_ntlm->outputBuffer, NULL, 0);

	DEBUG_RPC("\n%s", http_stream->data);
	tls_write_all(tls_in, http_stream->data, http_stream->size);

	http_response = http_response_recv(tls_in);

	crypto_base64_decode((uint8*) http_response->AuthParam, strlen(http_response->AuthParam),
			&ntlm_token_data, &ntlm_token_length);

	http_in_ntlm->inputBuffer.pvBuffer = ntlm_token_data;
	http_in_ntlm->inputBuffer.cbBuffer = ntlm_token_length;

	ntlm_authenticate(http_in_ntlm);

	http_stream = rpc_ntlm_http_data(rpc, "RPC_IN_DATA", &http_in_ntlm->outputBuffer, NULL, 0x40000000);

	DEBUG_RPC("\n%s", http_stream->data);
	tls_write_all(tls_in, http_stream->data, http_stream->size);

	/* At this point IN connection is ready to send CONN/B1 and start with sending data */

	http_in->state = RPC_HTTP_SENDING;

	return true;
}

int rpc_out_write(rdpRpc* rpc, uint8* data, int length)
{
	int status;
	rdpTls* tls_out = rpc->tls_out;
	rdpRpcHTTP* http_out = rpc->http_out;

	if (http_out->state == RPC_HTTP_DISCONNECTED)
	{
		if (!rpc_out_connect_http(rpc))
			return false;
	}

#ifdef WITH_DEBUG_RPC
	printf("rpc_out_write(): length: %d\n", length);
	freerdp_hexdump(data, length);
	printf("\n");
#endif

	status = tls_write_all(tls_out, data, length);

	return status;
}

int rpc_in_write(rdpRpc* rpc, uint8* data, int length)
{
	int status;
	rdpTls* tls_in = rpc->tls_in;
	rdpRpcHTTP* http_in = rpc->http_in;

	if (http_in->state == RPC_HTTP_DISCONNECTED)
	{
		if (!rpc_in_connect_http(rpc))
			return -1;
	}

#ifdef WITH_DEBUG_RPC
	printf("rpc_in_write() length: %d\n", length);
	freerdp_hexdump(data, length);
	printf("\n");
#endif

	status = tls_write_all(tls_in, data, length);

	if (status > 0)
		rpc->BytesSent += status;

	return status;
}

uint8* rpc_create_cookie()
{
	uint8* ret = xmalloc(16);
	RAND_pseudo_bytes(ret, 16);
	return ret;
}

boolean rpc_out_send_CONN_A1(rdpRpc* rpc)
{
	STREAM* s;
	uint32 ReceiveWindowSize;

	DEBUG_RPC("Sending CONN_A1");

	s = stream_new(76);
	ReceiveWindowSize = 0x00010000;
	rpc->virtualConnectionCookie = rpc_create_cookie(); /* 16 bytes */
	rpc->OUTChannelCookie = rpc_create_cookie(); /* 16 bytes */
	rpc->AwailableWindow = ReceiveWindowSize;

	rts_pdu_header_write(s, PFC_FIRST_FRAG | PFC_LAST_FRAG, 76, 0, 0, 0, 4); /* RTS Header (20 bytes) */
	rts_version_command_write(s); /* Version (8 bytes) */
	rts_cookie_command_write(s, rpc->virtualConnectionCookie); /* VirtualConnectionCookie (20 bytes) */
	rts_cookie_command_write(s, rpc->OUTChannelCookie); /* OUTChannelCookie (20 bytes) */
	rts_receive_window_size_command_write(s, ReceiveWindowSize); /* ReceiveWindowSize (8 bytes) */
	stream_seal(s);

	rpc_out_write(rpc, s->data, stream_get_length(s));

	stream_free(s);

	return true;
}

boolean rpc_in_send_CONN_B1(rdpRpc* rpc)
{
	STREAM* s;
	uint8* AssociationGroupId;

	DEBUG_RPC("Sending CONN_B1");

	s = stream_new(104);
	rpc->INChannelCookie = rpc_create_cookie(); /* 16 bytes */
	AssociationGroupId = rpc_create_cookie(); /* 16 bytes */

	rts_pdu_header_write(s, PFC_FIRST_FRAG | PFC_LAST_FRAG, 104, 0, 0, 0, 6); /* RTS Header (20 bytes) */
	rts_version_command_write(s); /* Version (8 bytes) */
	rts_cookie_command_write(s, rpc->virtualConnectionCookie); /* VirtualConnectionCookie (20 bytes) */
	rts_cookie_command_write(s, rpc->INChannelCookie); /* INChannelCookie (20 bytes) */
	rts_channel_lifetime_command_write(s, 0x40000000); /* ChannelLifetime (8 bytes) */
	rts_client_keepalive_command_write(s, 0x000493e0); /* ClientKeepalive (8 bytes) */
	rts_association_group_id_command_write(s, AssociationGroupId); /* AssociationGroupId (20 bytes) */
	stream_seal(s);

	rpc_in_write(rpc, s->data, s->size);

	stream_free(s);

	return true;
}

boolean rpc_in_send_keep_alive(rdpRpc* rpc)
{
	STREAM* s = stream_new(28);

	uint8 rpc_vers = 0x05;
	uint8 rpc_vers_minor = 0x00;
	uint8 ptype = PTYPE_RTS;
	uint8 pfc_flags = PFC_FIRST_FRAG | PFC_LAST_FRAG;
	uint32 packet_drep = 0x00000010;
	uint16 frag_length = 28;
	uint16 auth_length = 0;
	uint32 call_id = 0x00000000;
	uint16 flags = 0x0002;
	uint16 num_commands = 0x0001;
	uint32 ckCommandType = 0x00000005;
	uint32 ClientKeepalive = 0x00007530;

	stream_write_uint8(s, rpc_vers);
	stream_write_uint8(s, rpc_vers_minor);
	stream_write_uint8(s, ptype);
	stream_write_uint8(s, pfc_flags);
	stream_write_uint32(s, packet_drep);
	stream_write_uint16(s, frag_length);
	stream_write_uint16(s, auth_length);
	stream_write_uint32(s, call_id);
	stream_write_uint16(s, flags);
	stream_write_uint16(s, num_commands);
	stream_write_uint32(s, ckCommandType);
	stream_write_uint32(s, ClientKeepalive);

	rpc_in_write(rpc, s->data, stream_get_length(s));

	stream_free(s);

	return true;
}

boolean rpc_in_send_bind(rdpRpc* rpc)
{
	STREAM* pdu;
	rpcconn_bind_hdr_t* bind_pdu;
	rdpSettings* settings = rpc->settings;
	STREAM* ntlm_stream = stream_new(0xFFFF);

	/* TODO: Set NTLMv2 + DO_NOT_SEAL, DomainName = GatewayName? */

	rpc->ntlm = ntlm_new();

	DEBUG_RPC("TODO: complete NTLM integration");

	ntlm_client_init(rpc->ntlm, settings->username, settings->domain, settings->password);

	ntlm_authenticate(rpc->ntlm);
	ntlm_stream->size = rpc->ntlm->outputBuffer.cbBuffer;
	ntlm_stream->p = ntlm_stream->data = rpc->ntlm->outputBuffer.pvBuffer;

	bind_pdu = xnew(rpcconn_bind_hdr_t);
	bind_pdu->rpc_vers = 5;
	bind_pdu->rpc_vers_minor = 0;
	bind_pdu->PTYPE = PTYPE_BIND;
	bind_pdu->pfc_flags = PFC_FIRST_FRAG | PFC_LAST_FRAG | PFC_PENDING_CANCEL | PFC_CONC_MPX;
	bind_pdu->packed_drep[0] = 0x10;
	bind_pdu->packed_drep[1] = 0x00;
	bind_pdu->packed_drep[2] = 0x00;
	bind_pdu->packed_drep[3] = 0x00;
	bind_pdu->frag_length = 124 + ntlm_stream->size;
	bind_pdu->auth_length = ntlm_stream->size;
	bind_pdu->call_id = 2;
	bind_pdu->max_xmit_frag = 0x0FF8;
	bind_pdu->max_recv_frag = 0x0FF8;
	bind_pdu->assoc_group_id = 0;
	bind_pdu->p_context_elem.n_context_elem = 2;
	bind_pdu->p_context_elem.reserved = 0;
	bind_pdu->p_context_elem.reserved2 = 0;
	bind_pdu->p_context_elem.p_cont_elem = xmalloc(sizeof(p_cont_elem_t) * bind_pdu->p_context_elem.n_context_elem);
	bind_pdu->p_context_elem.p_cont_elem[0].p_cont_id = 0;
	bind_pdu->p_context_elem.p_cont_elem[0].n_transfer_syn = 1;
	bind_pdu->p_context_elem.p_cont_elem[0].reserved = 0;
	bind_pdu->p_context_elem.p_cont_elem[0].abstract_syntax.if_uuid.time_low = 0x44e265dd;
	bind_pdu->p_context_elem.p_cont_elem[0].abstract_syntax.if_uuid.time_mid = 0x7daf;
	bind_pdu->p_context_elem.p_cont_elem[0].abstract_syntax.if_uuid.time_hi_and_version = 0x42cd;
	bind_pdu->p_context_elem.p_cont_elem[0].abstract_syntax.if_uuid.clock_seq_hi_and_reserved = 0x85;
	bind_pdu->p_context_elem.p_cont_elem[0].abstract_syntax.if_uuid.clock_seq_low = 0x60;
	bind_pdu->p_context_elem.p_cont_elem[0].abstract_syntax.if_uuid.node[0] = 0x3c;
	bind_pdu->p_context_elem.p_cont_elem[0].abstract_syntax.if_uuid.node[1] = 0xdb;
	bind_pdu->p_context_elem.p_cont_elem[0].abstract_syntax.if_uuid.node[2] = 0x6e;
	bind_pdu->p_context_elem.p_cont_elem[0].abstract_syntax.if_uuid.node[3] = 0x7a;
	bind_pdu->p_context_elem.p_cont_elem[0].abstract_syntax.if_uuid.node[4] = 0x27;
	bind_pdu->p_context_elem.p_cont_elem[0].abstract_syntax.if_uuid.node[5] = 0x29;
	bind_pdu->p_context_elem.p_cont_elem[0].abstract_syntax.if_version = 0x00030001;
	bind_pdu->p_context_elem.p_cont_elem[0].transfer_syntaxes = xmalloc(sizeof(p_syntax_id_t));
	bind_pdu->p_context_elem.p_cont_elem[0].transfer_syntaxes[0].if_uuid.time_low = 0x8a885d04;
	bind_pdu->p_context_elem.p_cont_elem[0].transfer_syntaxes[0].if_uuid.time_mid = 0x1ceb;
	bind_pdu->p_context_elem.p_cont_elem[0].transfer_syntaxes[0].if_uuid.time_hi_and_version = 0x11c9;
	bind_pdu->p_context_elem.p_cont_elem[0].transfer_syntaxes[0].if_uuid.clock_seq_hi_and_reserved = 0x9f;
	bind_pdu->p_context_elem.p_cont_elem[0].transfer_syntaxes[0].if_uuid.clock_seq_low = 0xe8;
	bind_pdu->p_context_elem.p_cont_elem[0].transfer_syntaxes[0].if_uuid.node[0] = 0x08;
	bind_pdu->p_context_elem.p_cont_elem[0].transfer_syntaxes[0].if_uuid.node[1] = 0x00;
	bind_pdu->p_context_elem.p_cont_elem[0].transfer_syntaxes[0].if_uuid.node[2] = 0x2b;
	bind_pdu->p_context_elem.p_cont_elem[0].transfer_syntaxes[0].if_uuid.node[3] = 0x10;
	bind_pdu->p_context_elem.p_cont_elem[0].transfer_syntaxes[0].if_uuid.node[4] = 0x48;
	bind_pdu->p_context_elem.p_cont_elem[0].transfer_syntaxes[0].if_uuid.node[5] = 0x60;
	bind_pdu->p_context_elem.p_cont_elem[0].transfer_syntaxes[0].if_version = 0x00000002;
	bind_pdu->p_context_elem.p_cont_elem[1].p_cont_id = 1;
	bind_pdu->p_context_elem.p_cont_elem[1].n_transfer_syn = 1;
	bind_pdu->p_context_elem.p_cont_elem[1].reserved = 0;
	bind_pdu->p_context_elem.p_cont_elem[1].abstract_syntax.if_uuid.time_low = 0x44e265dd;
	bind_pdu->p_context_elem.p_cont_elem[1].abstract_syntax.if_uuid.time_mid = 0x7daf;
	bind_pdu->p_context_elem.p_cont_elem[1].abstract_syntax.if_uuid.time_hi_and_version = 0x42cd;
	bind_pdu->p_context_elem.p_cont_elem[1].abstract_syntax.if_uuid.clock_seq_hi_and_reserved = 0x85;
	bind_pdu->p_context_elem.p_cont_elem[1].abstract_syntax.if_uuid.clock_seq_low = 0x60;
	bind_pdu->p_context_elem.p_cont_elem[1].abstract_syntax.if_uuid.node[0] = 0x3c;
	bind_pdu->p_context_elem.p_cont_elem[1].abstract_syntax.if_uuid.node[1] = 0xdb;
	bind_pdu->p_context_elem.p_cont_elem[1].abstract_syntax.if_uuid.node[2] = 0x6e;
	bind_pdu->p_context_elem.p_cont_elem[1].abstract_syntax.if_uuid.node[3] = 0x7a;
	bind_pdu->p_context_elem.p_cont_elem[1].abstract_syntax.if_uuid.node[4] = 0x27;
	bind_pdu->p_context_elem.p_cont_elem[1].abstract_syntax.if_uuid.node[5] = 0x29;
	bind_pdu->p_context_elem.p_cont_elem[1].abstract_syntax.if_version = 0x00030001;
	bind_pdu->p_context_elem.p_cont_elem[1].transfer_syntaxes = xmalloc(sizeof(p_syntax_id_t));
	bind_pdu->p_context_elem.p_cont_elem[1].transfer_syntaxes[0].if_uuid.time_low = 0x6cb71c2c;
	bind_pdu->p_context_elem.p_cont_elem[1].transfer_syntaxes[0].if_uuid.time_mid = 0x9812;
	bind_pdu->p_context_elem.p_cont_elem[1].transfer_syntaxes[0].if_uuid.time_hi_and_version = 0x4540;
	bind_pdu->p_context_elem.p_cont_elem[1].transfer_syntaxes[0].if_uuid.clock_seq_hi_and_reserved = 0x03;
	bind_pdu->p_context_elem.p_cont_elem[1].transfer_syntaxes[0].if_uuid.clock_seq_low = 0x00;
	bind_pdu->p_context_elem.p_cont_elem[1].transfer_syntaxes[0].if_uuid.node[0] = 0x00;
	bind_pdu->p_context_elem.p_cont_elem[1].transfer_syntaxes[0].if_uuid.node[1] = 0x00;
	bind_pdu->p_context_elem.p_cont_elem[1].transfer_syntaxes[0].if_uuid.node[2] = 0x00;
	bind_pdu->p_context_elem.p_cont_elem[1].transfer_syntaxes[0].if_uuid.node[3] = 0x00;
	bind_pdu->p_context_elem.p_cont_elem[1].transfer_syntaxes[0].if_uuid.node[4] = 0x00;
	bind_pdu->p_context_elem.p_cont_elem[1].transfer_syntaxes[0].if_uuid.node[5] = 0x00;
	bind_pdu->p_context_elem.p_cont_elem[1].transfer_syntaxes[0].if_version = 0x00000001;
	bind_pdu->auth_verifier.auth_pad = NULL; /* align(4); size_is(auth_pad_length) p*/
	bind_pdu->auth_verifier.auth_type = 0x0a;       /* :01  which authent service */
	bind_pdu->auth_verifier.auth_level = 0x05;      /* :01  which level within service */
	bind_pdu->auth_verifier.auth_pad_length = 0x00; /* :01 */
	bind_pdu->auth_verifier.auth_reserved = 0x00;   /* :01 reserved, m.b.z. */
	bind_pdu->auth_verifier.auth_context_id = 0x00000000; /* :04 */
	bind_pdu->auth_verifier.auth_value = xmalloc(bind_pdu->auth_length); /* credentials; size_is(auth_length) p*/;
	memcpy(bind_pdu->auth_verifier.auth_value, ntlm_stream->data, bind_pdu->auth_length);

	stream_free(ntlm_stream);

	pdu = stream_new(bind_pdu->frag_length);

	stream_write(pdu, bind_pdu, 24);
	stream_write(pdu, &bind_pdu->p_context_elem, 4);
	stream_write(pdu, bind_pdu->p_context_elem.p_cont_elem, 24);
	stream_write(pdu, bind_pdu->p_context_elem.p_cont_elem[0].transfer_syntaxes, 20);
	stream_write(pdu, bind_pdu->p_context_elem.p_cont_elem + 1, 24);
	stream_write(pdu, bind_pdu->p_context_elem.p_cont_elem[1].transfer_syntaxes, 20);

	if (bind_pdu->auth_verifier.auth_pad_length > 0)
		stream_write(pdu, bind_pdu->auth_verifier.auth_pad, bind_pdu->auth_verifier.auth_pad_length);

	stream_write(pdu, &bind_pdu->auth_verifier.auth_type, 8); /* assumed that uint8 pointer is 32bit long (4 bytes) */
	stream_write(pdu, bind_pdu->auth_verifier.auth_value, bind_pdu->auth_length);

	rpc_in_write(rpc, pdu->data, stream_get_length(pdu));

	/* TODO there is some allocated memory */
	xfree(bind_pdu);

	return true;
}

boolean rpc_in_send_rpc_auth_3(rdpRpc* rpc)
{
	STREAM* pdu;
	rpcconn_rpc_auth_3_hdr_t* rpc_auth_3_pdu;
	STREAM* ntlm_stream = stream_new(0xFFFF);

	ntlm_authenticate(rpc->ntlm);
	ntlm_stream->size = rpc->ntlm->outputBuffer.cbBuffer;
	ntlm_stream->p = ntlm_stream->data = rpc->ntlm->outputBuffer.pvBuffer;

	rpc_auth_3_pdu = xnew(rpcconn_rpc_auth_3_hdr_t);
	rpc_auth_3_pdu->rpc_vers = 5;
	rpc_auth_3_pdu->rpc_vers_minor = 0;
	rpc_auth_3_pdu->PTYPE = PTYPE_RPC_AUTH_3;
	rpc_auth_3_pdu->pfc_flags = PFC_FIRST_FRAG | PFC_LAST_FRAG | PFC_CONC_MPX;
	rpc_auth_3_pdu->packed_drep[0] = 0x10;
	rpc_auth_3_pdu->packed_drep[1] = 0x00;
	rpc_auth_3_pdu->packed_drep[2] = 0x00;
	rpc_auth_3_pdu->packed_drep[3] = 0x00;
	rpc_auth_3_pdu->frag_length = 28 + ntlm_stream->size;
	rpc_auth_3_pdu->auth_length = ntlm_stream->size;
	rpc_auth_3_pdu->call_id = 2;
	rpc_auth_3_pdu->max_xmit_frag = 0x0FF8;
	rpc_auth_3_pdu->max_recv_frag = 0x0FF8;
	rpc_auth_3_pdu->auth_verifier.auth_pad = NULL; /* align(4); size_is(auth_pad_length) p */
	rpc_auth_3_pdu->auth_verifier.auth_type = 0x0a;       /* :01  which authent service */
	rpc_auth_3_pdu->auth_verifier.auth_level = 0x05;      /* :01  which level within service */
	rpc_auth_3_pdu->auth_verifier.auth_pad_length = 0x00; /* :01 */
	rpc_auth_3_pdu->auth_verifier.auth_reserved = 0x00;   /* :01 reserved, m.b.z. */
	rpc_auth_3_pdu->auth_verifier.auth_context_id = 0x00000000; /* :04 */
	rpc_auth_3_pdu->auth_verifier.auth_value = xmalloc(rpc_auth_3_pdu->auth_length); /* credentials; size_is(auth_length) p */
	memcpy(rpc_auth_3_pdu->auth_verifier.auth_value, ntlm_stream->data, rpc_auth_3_pdu->auth_length);

	stream_free(ntlm_stream);

	pdu = stream_new(rpc_auth_3_pdu->frag_length);

	stream_write(pdu, rpc_auth_3_pdu, 20);

	if (rpc_auth_3_pdu->auth_verifier.auth_pad_length > 0)
		stream_write(pdu, rpc_auth_3_pdu->auth_verifier.auth_pad, rpc_auth_3_pdu->auth_verifier.auth_pad_length);

	stream_write(pdu, &rpc_auth_3_pdu->auth_verifier.auth_type, 8);
	stream_write(pdu, rpc_auth_3_pdu->auth_verifier.auth_value, rpc_auth_3_pdu->auth_length);

	rpc_in_write(rpc, pdu->data, stream_get_length(pdu));

	xfree(rpc_auth_3_pdu);

	return true;
}

boolean rpc_in_send_flow_control(rdpRpc* rpc)
{
	STREAM* s = stream_new(56);

	uint8* b;
	uint8 rpc_vers = 0x05;
	uint8 rpc_vers_minor = 0x00;
	uint8 ptype = PTYPE_RTS;
	uint8 pfc_flags = PFC_FIRST_FRAG | PFC_LAST_FRAG;
	uint32 packet_drep = 0x00000010;
	uint16 frag_length = 56;
	uint16 auth_length = 0;
	uint32 call_id = 0x00000000;
	uint16 flags = 0x0002;
	uint16 num_commands = 0x0002;
	uint32 ckCommandType = 0x0000000d;
	uint32 ClientKeepalive = 0x00000003;
	uint32 a = 0x00000001;
	uint32 aa = rpc->BytesReceived;
	uint32 aaa = 0x00010000;

	rpc->AwailableWindow = aaa;
	b = rpc->OUTChannelCookie;

	stream_write_uint8(s, rpc_vers);
	stream_write_uint8(s, rpc_vers_minor);
	stream_write_uint8(s, ptype);
	stream_write_uint8(s, pfc_flags);
	stream_write_uint32(s, packet_drep);
	stream_write_uint16(s, frag_length);
	stream_write_uint16(s, auth_length);
	stream_write_uint32(s, call_id);
	stream_write_uint16(s, flags);
	stream_write_uint16(s, num_commands);
	stream_write_uint32(s, ckCommandType);
	stream_write_uint32(s, ClientKeepalive);
	stream_write_uint32(s, a);
	stream_write_uint32(s, aa);
	stream_write_uint32(s, aaa);
	stream_write(s, b, 16);

	rpc_in_write(rpc, s->data, stream_get_length(s));

	stream_free(s);

	return true;
}

boolean rpc_in_send_ping(rdpRpc* rpc)
{
	STREAM* s = stream_new(20);

	uint8 rpc_vers = 0x05;
	uint8 rpc_vers_minor = 0x00;
	uint8 ptype = PTYPE_RTS;
	uint8 pfc_flags = PFC_FIRST_FRAG | PFC_LAST_FRAG;
	uint32 packet_drep = 0x00000010;
	uint16 frag_length = 56;
	uint16 auth_length = 0;
	uint32 call_id = 0x00000000;
	uint16 flags = 0x0001;
	uint16 num_commands = 0x0000;

	stream_write_uint8(s, rpc_vers);
	stream_write_uint8(s, rpc_vers_minor);
	stream_write_uint8(s, ptype);
	stream_write_uint8(s, pfc_flags);
	stream_write_uint32(s, packet_drep);
	stream_write_uint16(s, frag_length);
	stream_write_uint16(s, auth_length);
	stream_write_uint32(s, call_id);
	stream_write_uint16(s, flags);
	stream_write_uint16(s, num_commands);

	rpc_in_write(rpc, s->data, stream_get_length(s));

	stream_free(s);

	return true;
}

int rpc_out_read_http_header(rdpRpc* rpc)
{
	int status = 0;
	HttpResponse* http_response;
	rdpTls* tls_out = rpc->tls_out;

	http_response = http_response_recv(tls_out);

	return status;
}

int rpc_rts_recv(rdpRpc* rpc, uint8* pdu, int length)
{
	int i;
	uint32 CommandType;
	uint16 flags = *(uint16*)(pdu + 16);
	uint16 num_commands = *(uint16*)(pdu + 18);
	uint8* iterator = pdu + 20;

	if (flags & RTS_FLAG_PING)
	{
		rpc_in_send_keep_alive(rpc);
		return 0;
	}

	for (i = 0; i < num_commands; i++)
	{
		CommandType = *(uint32*) iterator;

		switch (CommandType)
		{
			case 0x00000000: /* ReceiveWindowSize */
				iterator += 8;
				break;

			case 0x00000001: /* FlowControlAck */
				iterator += 28;
				break;

			case 0x00000002: /* ConnectionTimeout */
				iterator += 8;
				break;

			case 0x00000003: /* Cookie */
				iterator += 20;
				break;

			case 0x00000004: /* ChannelLifetime */
				iterator += 8;
				break;

			case 0x00000005: /* ClientKeepalive */
				iterator += 8;
				break;

			case 0x00000006: /* Version */
				iterator += 8;
				break;

			case 0x00000007: /* Empty */
				iterator += 4;
				break;

			case 0x00000008: /* Padding */
				iterator += 8 + *(uint32*) (iterator + 4);
				break;

			case 0x00000009: /* NegativeANCE */
				iterator += 4;
				break;

			case 0x0000000a: /* ANCE */
				iterator += 4;
				break;

			case 0x0000000b: /* ClientAddress */
				iterator += 4 + 4 + (12 * (*(uint32*) (iterator + 4))) + 12;
				break;

			case 0x0000000c: /* AssociationGroupId */
				iterator += 20;
				break;

			case 0x0000000d: /* Destination */
				iterator += 8;
				break;

			case 0x0000000e: /* PingTrafficSentNotify */
				iterator += 8;
				break;

			default:
				printf(" Error: Unknown RTS CommandType: 0x%x\n", CommandType);
				return -1;
		}
	}
	return 0;
}

int rpc_out_read(rdpRpc* rpc, uint8* data, int length)
{
	int status;
	uint8* pdu;
	uint8 ptype;
	uint16 frag_length;
	rdpTls* tls_out = rpc->tls_out;

	if (rpc->AwailableWindow < 0x00008FFF) /* Just a simple workaround */
		rpc_in_send_flow_control(rpc);  /* Send FlowControlAck every time AW reaches the half */

	pdu = xmalloc(0xFFFF);

	status = tls_read(tls_out, pdu, 10);

	if (status <= 0) /* read first 10 bytes to get the frag_length value */
	{
		xfree(pdu);
		return status;
	}

	ptype = *(pdu + 2);
	frag_length = *((uint16*) (pdu + 8));

	status = tls_read(tls_out, pdu + 10, frag_length - 10);

	if (status < 0)
	{
		xfree(pdu);
		return status;
	}

	if (ptype == 0x14) /* RTS PDU */
	{
		rpc_rts_recv(rpc, pdu, frag_length);
		xfree(pdu);
		return 0;
	}
	else
	{
		rpc->BytesReceived += frag_length; /* RTS PDUs are not subjects for FlowControl */
		rpc->AwailableWindow -= frag_length;
	}

	if (length < frag_length)
	{
		printf("rpc_out_read(): Error! Given buffer is to small. Received data fits not in.\n");
		xfree(pdu);
		return -1; /* TODO add buffer for storing remaining data for the next read in case destination buffer is too small */
	}

	memcpy(data, pdu, frag_length);

	if (strncmp((char*) pdu, "HTTP", 4) == 0)
	{
		printf("\n%s", (char*) pdu);
		return -1;
	}

#ifdef WITH_DEBUG_RPC
	printf("rpc_out_read(): length: %d\n", frag_length);
	freerdp_hexdump(data, frag_length);
	printf("\n");
#endif

	xfree(pdu);

	return frag_length;
}

int rpc_out_recv_bind_ack(rdpRpc* rpc)
{
	uint16 frag_length;
	uint16 auth_length;
	STREAM* ntlmssp_stream;
	int pdu_length = 0x8FFF; /* 32KB buffer */
	uint8* pdu = xmalloc(pdu_length);
	int status = rpc_out_read(rpc, pdu, pdu_length);

	DEBUG_RPC("TODO: complete NTLM integration");

	if (status > 0)
	{
		frag_length = *((uint16*)(pdu + 8));
		auth_length = *((uint16*)(pdu + 10));

		ntlmssp_stream = stream_new(0xFFFF);
		stream_write(ntlmssp_stream, (pdu + (frag_length - auth_length)), auth_length);
		ntlmssp_stream->p = ntlmssp_stream->data;

		//ntlmssp_recv(rpc->ntlmssp, ntlmssp_stream);

		stream_free(ntlmssp_stream);
	}

	xfree(pdu);
	return status;
}

int rpc_write(rdpRpc* rpc, uint8* data, int length, uint16 opnum)
{
	int i;
	int status = -1;
	rpcconn_request_hdr_t* request_pdu;

	uint8 auth_pad_length = 16 - ((24 + length + 8 + 16) % 16);

	if (auth_pad_length == 16)
		auth_pad_length = 0;

	request_pdu = xnew(rpcconn_request_hdr_t);
	request_pdu->rpc_vers = 5;
	request_pdu->rpc_vers_minor = 0;
	request_pdu->PTYPE = PTYPE_REQUEST;
	request_pdu->pfc_flags = PFC_FIRST_FRAG | PFC_LAST_FRAG;
	request_pdu->packed_drep[0] = 0x10;
	request_pdu->packed_drep[1] = 0x00;
	request_pdu->packed_drep[2] = 0x00;
	request_pdu->packed_drep[3] = 0x00;
	request_pdu->frag_length = 24 + length + auth_pad_length + 8 + 16;
	request_pdu->auth_length = 16;
	request_pdu->call_id = ++rpc->call_id;

	/* opnum=8 means [MS-TSGU] TsProxySetupRecievePipe, save call_id for checking pipe responses */

	if (opnum == 8)
		rpc->pipe_call_id = rpc->call_id;

	request_pdu->alloc_hint = length;
	request_pdu->p_cont_id = 0x0000;
	request_pdu->opnum = opnum;
	request_pdu->stub_data = data;
	request_pdu->auth_verifier.auth_type = 0x0a; /* :01  which authentication service */
	request_pdu->auth_verifier.auth_level = 0x05; /* :01  which level within service */
	request_pdu->auth_verifier.auth_pad_length = auth_pad_length; /* :01 */
	request_pdu->auth_verifier.auth_pad = xmalloc(auth_pad_length); /* align(4); size_is(auth_pad_length) p */

	for (i = 0; i < auth_pad_length; i++)
	{
		request_pdu->auth_verifier.auth_pad[i] = 0x00;
	}

	request_pdu->auth_verifier.auth_reserved = 0x00; /* :01 reserved, m.b.z. */
	request_pdu->auth_verifier.auth_context_id = 0x00000000; /* :04 */
	request_pdu->auth_verifier.auth_value = xmalloc(request_pdu->auth_length); /* credentials; size_is(auth_length) p */

	STREAM* pdu = stream_new(request_pdu->frag_length);

	stream_write(pdu, request_pdu, 24);
	stream_write(pdu, request_pdu->stub_data, request_pdu->alloc_hint);

	if (request_pdu->auth_verifier.auth_pad_length > 0)
		stream_write(pdu, request_pdu->auth_verifier.auth_pad, request_pdu->auth_verifier.auth_pad_length);

	stream_write(pdu, &request_pdu->auth_verifier.auth_type, 8);

	rdpBlob rdpMsg;
	rdpMsg.data = pdu->data;
	rdpMsg.length = stream_get_length(pdu);

	DEBUG_RPC("TODO: complete NTLM integration");

	//ntlmssp_encrypt_message(rpc->ntlmssp, &rdpMsg, NULL, request_pdu->auth_verifier.auth_value);

	stream_write(pdu, request_pdu->auth_verifier.auth_value, request_pdu->auth_length);

	status = rpc_in_write(rpc, pdu->data, pdu->p - pdu->data);

	xfree(request_pdu->auth_verifier.auth_value);
	xfree(request_pdu->auth_verifier.auth_pad);
	xfree(request_pdu);

	if (status < 0)
	{
		printf("rpc_write(): Error! rcph_in_write returned negative value.\n");
		return status;
	}

	return length;
}

int rpc_read(rdpRpc* rpc, uint8* data, int length)
{
	int status;
	int read = 0;
	int data_length;
	uint16 frag_length;
	uint16 auth_length;
	uint8 auth_pad_length;
	uint32 call_id = -1;
	int rpc_length = length + 0xFF;
	uint8* rpc_data = xmalloc(rpc_length);

	if (rpc->read_buffer_len > 0)
	{
		if (rpc->read_buffer_len > length)
		{
			/* TODO fix read_buffer is too long problem */
			printf("ERROR! RPC Stores data in read_buffer fits not in data on rpc_read.\n");
			return -1;
		}

		memcpy(data, rpc->read_buffer, rpc->read_buffer_len);
		read += rpc->read_buffer_len;
		xfree(rpc->read_buffer);
		rpc->read_buffer_len = 0;
	}

	while (true)
	{
		status = rpc_out_read(rpc, rpc_data, rpc_length);

		if (status == 0)
		{
			xfree(rpc_data);
			return read;
		}
		else if (status < 0)
		{
			printf("Error! rpc_out_read() returned negative value. BytesSent: %d, BytesReceived: %d\n",
					rpc->BytesSent, rpc->BytesReceived);

			xfree(rpc_data);
			return status;
		}

		frag_length = *(uint16*)(rpc_data + 8);
		auth_length = *(uint16*)(rpc_data + 10);
		call_id = *(uint32*)(rpc_data + 12);
		status = *(uint32*)(rpc_data + 16); /* alloc_hint */
		auth_pad_length = *(rpc_data + frag_length - auth_length - 6); /* -6 = -8 + 2 (sec_trailer + 2) */

		/* data_length must be calculated because alloc_hint carries size of more than one pdu */
		data_length = frag_length - auth_length - 24 - 8 - auth_pad_length; /* 24 is header; 8 is sec_trailer */

		if (status == 4)
			continue;

		if (read + data_length > length) /* if read data is greater then given buffer */
		{
			rpc->read_buffer_len = read + data_length - length;
			rpc->read_buffer = xmalloc(rpc->read_buffer_len);

			data_length -= rpc->read_buffer_len;

			memcpy(rpc->read_buffer, rpc_data + 24 + data_length, rpc->read_buffer_len);
		}

		memcpy(data + read, rpc_data + 24, data_length);

		read += data_length;

		if (status > data_length && read < length)
			continue;

		break;
	}

	xfree(rpc_data);

	return read;
}

boolean rpc_connect(rdpRpc* rpc)
{
	int status;
	uint8* pdu;
	int pdu_length;

	if (!rpc_out_send_CONN_A1(rpc))
	{
		printf("rpc_out_send_CONN_A1 fault!\n");
		return false;
	}

	pdu_length = 0xFFFF;
	pdu = xmalloc(pdu_length);

	status = rpc_out_read(rpc, pdu, pdu_length);

	if (!rpc_in_send_CONN_B1(rpc))
	{
		printf("rpc_out_send_CONN_A1 fault!\n");
		return false;
	}

	status = rpc_out_read(rpc, pdu, pdu_length);

	/* [MS-RPCH] 3.2.1.5.3.1 Connection Establishment
	 * at this point VirtualChannel is created
	 */
	if (!rpc_in_send_bind(rpc))
	{
		printf("rpc_out_send_bind fault!\n");
		return false;
	}

	if (!rpc_out_recv_bind_ack(rpc))
	{
		printf("rpc_out_recv_bind_ack fault!\n");
		return false;
	}

	if (!rpc_in_send_rpc_auth_3(rpc))
	{
		printf("rpc_out_send_rpc_auth_3 fault!\n");
		return false;
	}

	xfree(pdu);
	return true;
}

rdpRpc* rpc_new(rdpSettings* settings)
{
	rdpRpc* rpc = (rdpRpc*) xnew(rdpRpc);

	if (rpc != NULL)
	{
		rpc->http_in = (rdpRpcHTTP*) xnew(rdpRpcHTTP);
		rpc->http_out = (rdpRpcHTTP*) xnew(rdpRpcHTTP);

		rpc->http_in->ntlm = ntlm_new();
		rpc->http_out->ntlm = ntlm_new();
		rpc->http_in->state = RPC_HTTP_DISCONNECTED;
		rpc->http_out->state = RPC_HTTP_DISCONNECTED;

		rpc->http_in->context = http_context_new();
		http_context_set_method(rpc->http_in->context, "RPC_IN_DATA");
		http_context_set_uri(rpc->http_in->context, "/rpc/rpcproxy.dll?localhost:3388");
		http_context_set_accept(rpc->http_in->context, "application/rpc");
		http_context_set_cache_control(rpc->http_in->context, "no-cache");
		http_context_set_connection(rpc->http_in->context, "Keep-Alive");
		http_context_set_user_agent(rpc->http_in->context, "MSRPC");
		http_context_set_host(rpc->http_in->context, settings->tsg_hostname);
		http_context_set_pragma(rpc->http_in->context,
				"ResourceTypeUuid=44e265dd-7daf-42cd-8560-3cdb6e7a2729");

		rpc->http_out->context = http_context_new();
		http_context_set_method(rpc->http_out->context, "RPC_OUT_DATA");
		http_context_set_uri(rpc->http_out->context, "/rpc/rpcproxy.dll?localhost:3388");
		http_context_set_accept(rpc->http_out->context, "application/rpc");
		http_context_set_cache_control(rpc->http_out->context, "no-cache");
		http_context_set_connection(rpc->http_out->context, "Keep-Alive");
		http_context_set_user_agent(rpc->http_out->context, "MSRPC");
		http_context_set_host(rpc->http_out->context, settings->tsg_hostname);
		http_context_set_pragma(rpc->http_out->context,
				"ResourceTypeUuid=44e265dd-7daf-42cd-8560-3cdb6e7a2729" ", "
				"SessionId=fbd9c34f-397d-471d-a109-1b08cc554624");

		rpc->read_buffer = NULL;
		rpc->write_buffer = NULL;
		rpc->read_buffer_len = 0;
		rpc->write_buffer_len = 0;

		rpc->BytesReceived = 0;
		rpc->AwailableWindow = 0;
		rpc->BytesSent = 0;
		rpc->RecAwailableWindow = 0;

		rpc->settings = settings;

		rpc->ntlm = ntlm_new();

		rpc->call_id = 0;
	}

	return rpc;
}