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NetworkSocket.cpp
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NetworkSocket.cpp
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//
// Created by Grishka on 29.03.17.
//
#include <stdexcept>
#include <algorithm>
#include <stdlib.h>
#include <string.h>
#if defined(_WIN32)
#include <winsock2.h>
#include "os/windows/NetworkSocketWinsock.h"
#else
#include "os/posix/NetworkSocketPosix.h"
#endif
#include "logging.h"
#include "VoIPServerConfig.h"
#include "VoIPController.h"
#include "Buffers.h"
#include "NetworkSocket.h"
#define MIN_UDP_PORT 16384
#define MAX_UDP_PORT 32768
using namespace tgvoip;
NetworkSocket::NetworkSocket(NetworkProtocol protocol) : protocol(protocol){
ipv6Timeout=ServerConfig::GetSharedInstance()->GetDouble("nat64_fallback_timeout", 3);
failed=false;
}
NetworkSocket::~NetworkSocket(){
}
std::string NetworkSocket::GetLocalInterfaceInfo(NetworkAddress *inet4addr, NetworkAddress *inet6addr){
std::string r="not implemented";
return r;
}
uint16_t NetworkSocket::GenerateLocalPort(){
uint16_t rnd;
VoIPController::crypto.rand_bytes(reinterpret_cast<uint8_t*>(&rnd), 2);
return (uint16_t) ((rnd%(MAX_UDP_PORT-MIN_UDP_PORT))+MIN_UDP_PORT);
}
void NetworkSocket::SetMaxPriority(){
}
bool NetworkSocket::IsFailed(){
return failed;
}
NetworkSocket *NetworkSocket::Create(NetworkProtocol protocol){
#ifndef _WIN32
return new NetworkSocketPosix(protocol);
#else
return new NetworkSocketWinsock(protocol);
#endif
}
NetworkAddress NetworkSocket::ResolveDomainName(std::string name){
#ifndef _WIN32
return NetworkSocketPosix::ResolveDomainName(name);
#else
return NetworkSocketWinsock::ResolveDomainName(name);
#endif
}
void NetworkSocket::GenerateTCPO2States(unsigned char* buffer, TCPO2State* recvState, TCPO2State* sendState){
memset(recvState, 0, sizeof(TCPO2State));
memset(sendState, 0, sizeof(TCPO2State));
unsigned char nonce[64];
uint32_t *first = reinterpret_cast<uint32_t*>(nonce), *second = first + 1;
uint32_t first1 = 0x44414548U, first2 = 0x54534f50U, first3 = 0x20544547U, first4 = 0x20544547U, first5 = 0xeeeeeeeeU;
uint32_t second1 = 0;
do {
VoIPController::crypto.rand_bytes(nonce, sizeof(nonce));
} while (*first == first1 || *first == first2 || *first == first3 || *first == first4 || *first == first5 || *second == second1 || *reinterpret_cast<unsigned char*>(nonce) == 0xef);
// prepare encryption key/iv
memcpy(sendState->key, nonce + 8, 32);
memcpy(sendState->iv, nonce + 8 + 32, 16);
// prepare decryption key/iv
char reversed[48];
memcpy(reversed, nonce + 8, sizeof(reversed));
std::reverse(reversed, reversed + sizeof(reversed));
memcpy(recvState->key, reversed, 32);
memcpy(recvState->iv, reversed + 32, 16);
// write protocol identifier
*reinterpret_cast<uint32_t*>(nonce + 56) = 0xefefefefU;
memcpy(buffer, nonce, 56);
EncryptForTCPO2(nonce, sizeof(nonce), sendState);
memcpy(buffer+56, nonce+56, 8);
}
void NetworkSocket::EncryptForTCPO2(unsigned char *buffer, size_t len, TCPO2State *state){
VoIPController::crypto.aes_ctr_encrypt(buffer, len, state->key, state->iv, state->ecount, &state->num);
}
size_t NetworkSocket::Receive(unsigned char *buffer, size_t len){
NetworkPacket pkt=Receive(len);
if(pkt.IsEmpty())
return 0;
size_t actualLen=std::min(len, pkt.data.Length());
memcpy(buffer, *pkt.data, actualLen);
return actualLen;
}
bool NetworkAddress::operator==(const NetworkAddress &other) const{
if(isIPv6!=other.isIPv6)
return false;
if(!isIPv6){
return addr.ipv4==other.addr.ipv4;
}
return memcmp(addr.ipv6, other.addr.ipv6, 16)==0;
}
bool NetworkAddress::operator!=(const NetworkAddress &other) const{
return !(*this == other);
}
std::string NetworkAddress::ToString() const{
if(isIPv6){
#ifndef _WIN32
return NetworkSocketPosix::V6AddressToString(addr.ipv6);
#else
return NetworkSocketWinsock::V6AddressToString(addr.ipv6);
#endif
}else{
#ifndef _WIN32
return NetworkSocketPosix::V4AddressToString(addr.ipv4);
#else
return NetworkSocketWinsock::V4AddressToString(addr.ipv4);
#endif
}
}
bool NetworkAddress::IsEmpty() const{
if(isIPv6){
const uint64_t* a=reinterpret_cast<const uint64_t*>(addr.ipv6);
return a[0]==0LL && a[1]==0LL;
}
return addr.ipv4==0;
}
bool NetworkAddress::PrefixMatches(const unsigned int prefix, const NetworkAddress &other) const{
if(isIPv6!=other.isIPv6)
return false;
if(!isIPv6){
uint32_t mask=0xFFFFFFFF << (32-prefix);
return (addr.ipv4 & mask) == (other.addr.ipv4 & mask);
}
return false;
}
NetworkAddress NetworkAddress::Empty(){
NetworkAddress addr;
addr.isIPv6=false;
addr.addr.ipv4=0;
return addr;
}
NetworkAddress NetworkAddress::IPv4(std::string str){
NetworkAddress addr;
addr.isIPv6=false;
#ifndef _WIN32
addr.addr.ipv4=NetworkSocketPosix::StringToV4Address(str);
#else
addr.addr.ipv4=NetworkSocketWinsock::StringToV4Address(str);
#endif
return addr;
}
NetworkAddress NetworkAddress::IPv4(uint32_t addr){
NetworkAddress a;
a.isIPv6=false;
a.addr.ipv4=addr;
return a;
}
NetworkAddress NetworkAddress::IPv6(std::string str){
NetworkAddress addr;
addr.isIPv6=false;
#ifndef _WIN32
NetworkSocketPosix::StringToV6Address(str, addr.addr.ipv6);
#else
NetworkSocketWinsock::StringToV6Address(str, addr.addr.ipv6);
#endif
return addr;
}
NetworkAddress NetworkAddress::IPv6(const uint8_t addr[16]){
NetworkAddress a;
a.isIPv6=true;
memcpy(a.addr.ipv6, addr, 16);
return a;
}
bool NetworkSocket::Select(std::vector<NetworkSocket *> &readFds, std::vector<NetworkSocket*> &writeFds, std::vector<NetworkSocket *> &errorFds, SocketSelectCanceller *canceller){
#ifndef _WIN32
return NetworkSocketPosix::Select(readFds, writeFds, errorFds, canceller);
#else
return NetworkSocketWinsock::Select(readFds, writeFds, errorFds, canceller);
#endif
}
SocketSelectCanceller::~SocketSelectCanceller(){
}
SocketSelectCanceller *SocketSelectCanceller::Create(){
#ifndef _WIN32
return new SocketSelectCancellerPosix();
#else
return new SocketSelectCancellerWin32();
#endif
}
NetworkSocketTCPObfuscated::NetworkSocketTCPObfuscated(NetworkSocket *wrapped) : NetworkSocketWrapper(NetworkProtocol::TCP){
this->wrapped=wrapped;
}
NetworkSocketTCPObfuscated::~NetworkSocketTCPObfuscated(){
if(wrapped)
delete wrapped;
}
NetworkSocket *NetworkSocketTCPObfuscated::GetWrapped(){
return wrapped;
}
void NetworkSocketTCPObfuscated::InitConnection(){
Buffer buf(64);
GenerateTCPO2States(*buf, &recvState, &sendState);
wrapped->Send(NetworkPacket{
std::move(buf),
NetworkAddress::Empty(),
0,
NetworkProtocol::TCP
});
}
void NetworkSocketTCPObfuscated::Send(NetworkPacket packet){
BufferOutputStream os(packet.data.Length()+4);
size_t len=packet.data.Length()/4;
if(len<0x7F){
os.WriteByte((unsigned char)len);
}else{
os.WriteByte(0x7F);
os.WriteByte((unsigned char)(len & 0xFF));
os.WriteByte((unsigned char)((len >> 8) & 0xFF));
os.WriteByte((unsigned char)((len >> 16) & 0xFF));
}
os.WriteBytes(packet.data);
EncryptForTCPO2(os.GetBuffer(), os.GetLength(), &sendState);
wrapped->Send(NetworkPacket{
Buffer(std::move(os)),
NetworkAddress::Empty(),
0,
NetworkProtocol::TCP
});
//LOGD("Sent %u bytes", os.GetLength());
}
bool NetworkSocketTCPObfuscated::OnReadyToSend(){
LOGV("TCPO socket ready to send");
if(!initialized){
LOGV("Initializing TCPO2 connection");
initialized=true;
InitConnection();
readyToSend=true;
return false;
}
return wrapped->OnReadyToSend();
}
NetworkPacket NetworkSocketTCPObfuscated::Receive(size_t maxLen){
unsigned char len1;
size_t packetLen=0;
size_t offset=0;
size_t len;
len=wrapped->Receive(&len1, 1);
if(len<=0){
return NetworkPacket::Empty();
}
EncryptForTCPO2(&len1, 1, &recvState);
if(len1<0x7F){
packetLen=(size_t)len1*4;
}else{
unsigned char len2[3];
len=wrapped->Receive(len2, 3);
if(len<=0){
return NetworkPacket::Empty();
}
EncryptForTCPO2(len2, 3, &recvState);
packetLen=((size_t)len2[0] | ((size_t)len2[1] << 8) | ((size_t)len2[2] << 16))*4;
}
if(packetLen>1500){
LOGW("packet too big to fit into buffer (%u vs %u)", (unsigned int)packetLen, (unsigned int)1500);
return NetworkPacket::Empty();
}
Buffer buf(packetLen);
while(offset<packetLen){
len=wrapped->Receive(*buf, packetLen-offset);
if(len<=0){
return NetworkPacket::Empty();
}
offset+=len;
}
EncryptForTCPO2(*buf, packetLen, &recvState);
return NetworkPacket{
std::move(buf),
wrapped->GetConnectedAddress(),
wrapped->GetConnectedPort(),
NetworkProtocol::TCP
};
}
void NetworkSocketTCPObfuscated::Open(){
}
void NetworkSocketTCPObfuscated::Close(){
wrapped->Close();
}
void NetworkSocketTCPObfuscated::Connect(const NetworkAddress address, uint16_t port){
wrapped->Connect(address, port);
}
bool NetworkSocketTCPObfuscated::IsFailed(){
return wrapped->IsFailed();
}
NetworkSocketSOCKS5Proxy::NetworkSocketSOCKS5Proxy(NetworkSocket *tcp, NetworkSocket *udp, std::string username, std::string password) : NetworkSocketWrapper(udp ? NetworkProtocol::UDP : NetworkProtocol::TCP){
this->tcp=tcp;
this->udp=udp;
this->username=username;
this->password=password;
}
NetworkSocketSOCKS5Proxy::~NetworkSocketSOCKS5Proxy(){
delete tcp;
}
void NetworkSocketSOCKS5Proxy::Send(NetworkPacket packet){
if(protocol==NetworkProtocol::TCP){
tcp->Send(std::move(packet));
}else if(protocol==NetworkProtocol::UDP){
BufferOutputStream out(1500);
out.WriteInt16(0); // RSV
out.WriteByte(0); // FRAG
if(!packet.address.isIPv6){
out.WriteByte(1); // ATYP (IPv4)
out.WriteInt32(packet.address.addr.ipv4);
}else{
out.WriteByte(4); // ATYP (IPv6)
out.WriteBytes(packet.address.addr.ipv6, 16);
}
out.WriteInt16(htons(packet.port));
out.WriteBytes(packet.data);
udp->Send(NetworkPacket{
Buffer(std::move(out)),
connectedAddress,
connectedPort,
NetworkProtocol::UDP
});
}
}
NetworkPacket NetworkSocketSOCKS5Proxy::Receive(size_t maxLen){
if(protocol==NetworkProtocol::TCP){
NetworkPacket packet=tcp->Receive();
packet.address=connectedAddress;
packet.port=connectedPort;
return packet;
}else{
NetworkPacket p=udp->Receive();
if(!p.IsEmpty() && p.address==connectedAddress && p.port==connectedPort){
BufferInputStream in(p.data);
in.ReadInt16(); // RSV
in.ReadByte(); // FRAG
unsigned char atyp=in.ReadByte();
NetworkAddress address=NetworkAddress::Empty();
if(atyp==1){ // IPv4
address=NetworkAddress::IPv4((uint32_t) in.ReadInt32());
}else if(atyp==4){ // IPv6
unsigned char addr[16];
in.ReadBytes(addr, 16);
address=NetworkAddress::IPv6(addr);
}
return NetworkPacket{
Buffer::CopyOf(p.data, in.GetOffset(), in.Remaining()),
address,
htons(in.ReadInt16()),
protocol
};
}
}
return NetworkPacket::Empty();
}
void NetworkSocketSOCKS5Proxy::Open(){
}
void NetworkSocketSOCKS5Proxy::Close(){
tcp->Close();
}
void NetworkSocketSOCKS5Proxy::Connect(const NetworkAddress address, uint16_t port){
connectedAddress=address;
connectedPort=port;
}
NetworkSocket *NetworkSocketSOCKS5Proxy::GetWrapped(){
return protocol==NetworkProtocol::TCP ? tcp : udp;
}
void NetworkSocketSOCKS5Proxy::InitConnection(){
}
bool NetworkSocketSOCKS5Proxy::IsFailed(){
return NetworkSocket::IsFailed() || tcp->IsFailed();
}
NetworkAddress NetworkSocketSOCKS5Proxy::GetConnectedAddress(){
return connectedAddress;
}
uint16_t NetworkSocketSOCKS5Proxy::GetConnectedPort(){
return connectedPort;
}
bool NetworkSocketSOCKS5Proxy::OnReadyToSend(){
//LOGV("on ready to send, state=%d", state);
if(state==ConnectionState::Initial){
BufferOutputStream p(16);
p.WriteByte(5); // VER
if(!username.empty()){
p.WriteByte(2); // NMETHODS
p.WriteByte(0); // no auth
p.WriteByte(2); // user/pass
}else{
p.WriteByte(1); // NMETHODS
p.WriteByte(0); // no auth
}
tcp->Send(NetworkPacket{
Buffer(std::move(p)),
NetworkAddress::Empty(),
0,
NetworkProtocol::TCP
});
state=ConnectionState::WaitingForAuthMethod;
return false;
}
return udp ? udp->OnReadyToSend() : tcp->OnReadyToSend();
}
bool NetworkSocketSOCKS5Proxy::OnReadyToReceive(){
//LOGV("on ready to receive state=%d", state);
unsigned char buf[1024];
if(state==ConnectionState::WaitingForAuthMethod){
size_t l=tcp->Receive(buf, sizeof(buf));
if(l<2 || tcp->IsFailed()){
failed=true;
return false;
}
BufferInputStream in(buf, l);
unsigned char ver=in.ReadByte();
unsigned char chosenMethod=in.ReadByte();
LOGV("socks5: VER=%02X, METHOD=%02X", ver, chosenMethod);
if(ver!=5){
LOGW("socks5: incorrect VER in response");
failed=true;
return false;
}
if(chosenMethod==0){
// connected, no further auth needed
SendConnectionCommand();
}else if(chosenMethod==2 && !username.empty()){
BufferOutputStream p(512);
p.WriteByte(1); // VER
p.WriteByte((unsigned char)(username.length()>255 ? 255 : username.length())); // ULEN
p.WriteBytes((unsigned char*)username.c_str(), username.length()>255 ? 255 : username.length()); // UNAME
p.WriteByte((unsigned char)(password.length()>255 ? 255 : password.length())); // PLEN
p.WriteBytes((unsigned char*)password.c_str(), password.length()>255 ? 255 : password.length()); // PASSWD
tcp->Send(NetworkPacket{
Buffer(std::move(p)),
NetworkAddress::Empty(),
0,
NetworkProtocol::TCP
});
state=ConnectionState::WaitingForAuthResult;
}else{
LOGW("socks5: unsupported auth method");
failed=true;
return false;
}
return false;
}else if(state==ConnectionState::WaitingForAuthResult){
size_t l=tcp->Receive(buf, sizeof(buf));
if(l<2 || tcp->IsFailed()){
failed=true;
return false;
}
BufferInputStream in(buf, l);
uint8_t ver=in.ReadByte();
unsigned char status=in.ReadByte();
LOGV("socks5: auth response VER=%02X, STATUS=%02X", ver, status);
if(ver!=1){
LOGW("socks5: auth response VER is incorrect");
failed=true;
return false;
}
if(status!=0){
LOGW("socks5: username/password auth failed");
failed=true;
return false;
}
LOGV("socks5: authentication succeeded");
SendConnectionCommand();
return false;
}else if(state==ConnectionState::WaitingForCommandResult){
size_t l=tcp->Receive(buf, sizeof(buf));
if(protocol==NetworkProtocol::TCP){
if(l<2 || tcp->IsFailed()){
LOGW("socks5: connect failed")
failed=true;
return false;
}
BufferInputStream in(buf, l);
unsigned char ver=in.ReadByte();
if(ver!=5){
LOGW("socks5: connect: wrong ver in response");
failed=true;
return false;
}
unsigned char rep=in.ReadByte();
if(rep!=0){
LOGW("socks5: connect: failed with error %02X", rep);
failed=true;
return false;
}
LOGV("socks5: connect succeeded");
state=ConnectionState::Connected;
tcp=new NetworkSocketTCPObfuscated(tcp);
readyToSend=true;
return tcp->OnReadyToSend();
}else if(protocol==NetworkProtocol::UDP){
if(l<2 || tcp->IsFailed()){
LOGW("socks5: udp associate failed");
failed=true;
return false;
}
try{
BufferInputStream in(buf, l);
unsigned char ver=in.ReadByte();
unsigned char rep=in.ReadByte();
if(ver!=5){
LOGW("socks5: udp associate: wrong ver in response");
failed=true;
return false;
}
if(rep!=0){
LOGW("socks5: udp associate failed with error %02X", rep);
failed=true;
return false;
}
in.ReadByte(); // RSV
unsigned char atyp=in.ReadByte();
if(atyp==1){
uint32_t addr=(uint32_t) in.ReadInt32();
connectedAddress=NetworkAddress::IPv4(addr);
}else if(atyp==3){
unsigned char len=in.ReadByte();
char domain[256];
memset(domain, 0, sizeof(domain));
in.ReadBytes((unsigned char*)domain, len);
LOGD("address type is domain, address=%s", domain);
connectedAddress=ResolveDomainName(std::string(domain));
if(connectedAddress.IsEmpty()){
LOGW("socks5: failed to resolve domain name '%s'", domain);
failed=true;
return false;
}
}else if(atyp==4){
unsigned char addr[16];
in.ReadBytes(addr, 16);
connectedAddress=NetworkAddress::IPv6(addr);
}else{
LOGW("socks5: unknown address type %d", atyp);
failed=true;
return false;
}
connectedPort=(uint16_t)ntohs(in.ReadInt16());
state=ConnectionState::Connected;
readyToSend=true;
LOGV("socks5: udp associate successful, given endpoint %s:%d", connectedAddress.ToString().c_str(), connectedPort);
}catch(std::out_of_range& x){
LOGW("socks5: udp associate response parse failed");
failed=true;
}
}
}
return udp ? udp->OnReadyToReceive() : tcp->OnReadyToReceive();
}
void NetworkSocketSOCKS5Proxy::SendConnectionCommand(){
BufferOutputStream out(1024);
if(protocol==NetworkProtocol::TCP){
out.WriteByte(5); // VER
out.WriteByte(1); // CMD (CONNECT)
out.WriteByte(0); // RSV
if(!connectedAddress.isIPv6){
out.WriteByte(1); // ATYP (IPv4)
out.WriteInt32(connectedAddress.addr.ipv4);
}else{
out.WriteByte(4); // ATYP (IPv6)
out.WriteBytes((unsigned char*)connectedAddress.addr.ipv6, 16);
}
out.WriteInt16(htons(connectedPort)); // DST.PORT
}else if(protocol==NetworkProtocol::UDP){
LOGV("Sending udp associate");
out.WriteByte(5); // VER
out.WriteByte(3); // CMD (UDP ASSOCIATE)
out.WriteByte(0); // RSV
out.WriteByte(1); // ATYP (IPv4)
out.WriteInt32(0); // DST.ADDR
out.WriteInt16(0); // DST.PORT
}
tcp->Send(NetworkPacket{
Buffer(std::move(out)),
NetworkAddress::Empty(),
0,
NetworkProtocol::TCP
});
state=ConnectionState::WaitingForCommandResult;
}
bool NetworkSocketSOCKS5Proxy::NeedSelectForSending(){
return state==ConnectionState::Initial || state==ConnectionState::Connected;
}