I2P: End-to-End encrypted and anonymous Internet https://i2pd.website/
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/*
* Copyright (c) 2013-2024, The PurpleI2P Project
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*
* This file is part of Purple i2pd project and licensed under BSD3
*
* See full license text in LICENSE file at top of project tree
*/
#include <stdio.h>
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#include <sstream>
#include <iomanip>
#include <openssl/x509.h>
#include <openssl/pem.h>
// Use global placeholders from boost introduced when local_time.hpp is loaded
#define BOOST_BIND_GLOBAL_PLACEHOLDERS
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#include <boost/property_tree/json_parser.hpp>
#include <boost/lexical_cast.hpp>
#include "FS.h"
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#include "Log.h"
#include "Config.h"
#include "NetDb.hpp"
#include "Tunnel.h"
#include "Daemon.h"
#include "I2PControl.h"
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namespace i2p
{
namespace client
{
I2PControlService::I2PControlService (const std::string& address, int port):
m_IsRunning (false), m_Thread (nullptr),
m_Acceptor (m_Service, boost::asio::ip::tcp::endpoint(boost::asio::ip::address::from_string(address), port)),
m_SSLContext (boost::asio::ssl::context::sslv23),
m_ShutdownTimer (m_Service)
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{
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i2p::config::GetOption("i2pcontrol.password", m_Password);
// certificate / keys
std::string i2pcp_crt; i2p::config::GetOption("i2pcontrol.cert", i2pcp_crt);
std::string i2pcp_key; i2p::config::GetOption("i2pcontrol.key", i2pcp_key);
if (i2pcp_crt.at(0) != '/')
i2pcp_crt = i2p::fs::DataDirPath(i2pcp_crt);
if (i2pcp_key.at(0) != '/')
i2pcp_key = i2p::fs::DataDirPath(i2pcp_key);
if (!i2p::fs::Exists (i2pcp_crt) || !i2p::fs::Exists (i2pcp_key))
{
LogPrint (eLogInfo, "I2PControl: Creating new certificate for control connection");
CreateCertificate (i2pcp_crt.c_str(), i2pcp_key.c_str());
}
else
LogPrint(eLogDebug, "I2PControl: Using cert from ", i2pcp_crt);
m_SSLContext.set_options (boost::asio::ssl::context::default_workarounds | boost::asio::ssl::context::no_sslv2 | boost::asio::ssl::context::single_dh_use);
boost::system::error_code ec;
m_SSLContext.use_certificate_file (i2pcp_crt, boost::asio::ssl::context::pem, ec);
if (!ec)
m_SSLContext.use_private_key_file (i2pcp_key, boost::asio::ssl::context::pem, ec);
if (ec)
{
LogPrint (eLogInfo, "I2PControl: Failed to load ceritifcate: ", ec.message (), ". Recreating");
CreateCertificate (i2pcp_crt.c_str(), i2pcp_key.c_str());
m_SSLContext.use_certificate_file (i2pcp_crt, boost::asio::ssl::context::pem, ec);
if (!ec)
m_SSLContext.use_private_key_file (i2pcp_key, boost::asio::ssl::context::pem, ec);
if (ec)
// give up
LogPrint (eLogError, "I2PControl: Can't load certificates");
}
// handlers
m_MethodHandlers["Authenticate"] = &I2PControlService::AuthenticateHandler;
m_MethodHandlers["Echo"] = &I2PControlService::EchoHandler;
m_MethodHandlers["I2PControl"] = &I2PControlService::I2PControlHandler;
m_MethodHandlers["RouterInfo"] = &I2PControlHandlers::RouterInfoHandler;
m_MethodHandlers["RouterManager"] = &I2PControlService::RouterManagerHandler;
m_MethodHandlers["NetworkSetting"] = &I2PControlHandlers::NetworkSettingHandler;
m_MethodHandlers["ClientServicesInfo"] = &I2PControlHandlers::ClientServicesInfoHandler;
// I2PControl
m_I2PControlHandlers["i2pcontrol.password"] = &I2PControlService::PasswordHandler;
// RouterManager
m_RouterManagerHandlers["Reseed"] = &I2PControlService::ReseedHandler;
m_RouterManagerHandlers["Shutdown"] = &I2PControlService::ShutdownHandler;
m_RouterManagerHandlers["ShutdownGraceful"] = &I2PControlService::ShutdownGracefulHandler;
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}
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I2PControlService::~I2PControlService ()
{
Stop ();
}
void I2PControlService::Start ()
{
if (!m_IsRunning)
{
Accept ();
m_IsRunning = true;
m_Thread = new std::thread (std::bind (&I2PControlService::Run, this));
}
}
void I2PControlService::Stop ()
{
if (m_IsRunning)
{
m_IsRunning = false;
m_Acceptor.cancel ();
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m_Service.stop ();
if (m_Thread)
{
m_Thread->join ();
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delete m_Thread;
m_Thread = nullptr;
}
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}
}
void I2PControlService::Run ()
{
i2p::util::SetThreadName("I2PC");
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while (m_IsRunning)
{
try {
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m_Service.run ();
} catch (std::exception& ex) {
LogPrint (eLogError, "I2PControl: Runtime exception: ", ex.what ());
}
}
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}
void I2PControlService::Accept ()
{
auto newSocket = std::make_shared<ssl_socket> (m_Service, m_SSLContext);
m_Acceptor.async_accept (newSocket->lowest_layer(), std::bind (&I2PControlService::HandleAccept, this,
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std::placeholders::_1, newSocket));
}
void I2PControlService::HandleAccept(const boost::system::error_code& ecode, std::shared_ptr<ssl_socket> socket)
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{
if (ecode != boost::asio::error::operation_aborted)
Accept ();
if (ecode) {
LogPrint (eLogError, "I2PControl: Accept error: ", ecode.message ());
return;
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}
LogPrint (eLogDebug, "I2PControl: New request from ", socket->lowest_layer ().remote_endpoint ());
Handshake (socket);
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}
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void I2PControlService::Handshake (std::shared_ptr<ssl_socket> socket)
{
socket->async_handshake(boost::asio::ssl::stream_base::server,
std::bind( &I2PControlService::HandleHandshake, this, std::placeholders::_1, socket));
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}
void I2PControlService::HandleHandshake (const boost::system::error_code& ecode, std::shared_ptr<ssl_socket> socket)
{
if (ecode) {
LogPrint (eLogError, "I2PControl: Handshake error: ", ecode.message ());
return;
}
//std::this_thread::sleep_for (std::chrono::milliseconds(5));
ReadRequest (socket);
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}
void I2PControlService::ReadRequest (std::shared_ptr<ssl_socket> socket)
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{
auto request = std::make_shared<I2PControlBuffer>();
socket->async_read_some (
#if defined(BOOST_ASIO_HAS_STD_ARRAY)
boost::asio::buffer (*request),
#else
boost::asio::buffer (request->data (), request->size ()),
#endif
std::bind(&I2PControlService::HandleRequestReceived, this,
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std::placeholders::_1, std::placeholders::_2, socket, request));
}
void I2PControlService::HandleRequestReceived (const boost::system::error_code& ecode,
size_t bytes_transferred, std::shared_ptr<ssl_socket> socket,
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std::shared_ptr<I2PControlBuffer> buf)
{
if (ecode)
{
LogPrint (eLogError, "I2PControl: Read error: ", ecode.message ());
return;
}
else
{
bool isHtml = !memcmp (buf->data (), "POST", 4);
try
{
std::stringstream ss;
ss.write (buf->data (), bytes_transferred);
if (isHtml)
{
std::string header;
size_t contentLength = 0;
while (!ss.eof () && header != "\r")
{
std::getline(ss, header);
auto colon = header.find (':');
if (colon != std::string::npos && header.substr (0, colon) == "Content-Length")
contentLength = std::stoi (header.substr (colon + 1));
}
if (ss.eof ())
{
LogPrint (eLogError, "I2PControl: Malformed request, HTTP header expected");
return; // TODO:
}
std::streamoff rem = contentLength + ss.tellg () - bytes_transferred; // more bytes to read
if (rem > 0)
{
bytes_transferred = boost::asio::read (*socket, boost::asio::buffer (buf->data (), rem));
ss.write (buf->data (), bytes_transferred);
}
}
std::ostringstream response;
boost::property_tree::ptree pt;
boost::property_tree::read_json (ss, pt);
std::string id = pt.get<std::string>("id");
std::string method = pt.get<std::string>("method");
auto it = m_MethodHandlers.find (method);
if (it != m_MethodHandlers.end ())
{
response << "{\"id\":" << id << ",\"result\":{";
(this->*(it->second))(pt.get_child ("params"), response);
response << "},\"jsonrpc\":\"2.0\"}";
}
else
{
LogPrint (eLogWarning, "I2PControl: Unknown method ", method);
response << "{\"id\":null,\"error\":";
response << "{\"code\":-32601,\"message\":\"Method not found\"},";
response << "\"jsonrpc\":\"2.0\"}";
}
SendResponse (socket, buf, response, isHtml);
}
catch (std::exception& ex)
{
LogPrint (eLogError, "I2PControl: Exception when handle request: ", ex.what ());
std::ostringstream response;
response << "{\"id\":null,\"error\":";
response << "{\"code\":-32700,\"message\":\"" << ex.what () << "\"},";
response << "\"jsonrpc\":\"2.0\"}";
SendResponse (socket, buf, response, isHtml);
}
catch (...)
{
LogPrint (eLogError, "I2PControl: Handle request unknown exception");
}
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}
}
void I2PControlService::SendResponse (std::shared_ptr<ssl_socket> socket,
std::shared_ptr<I2PControlBuffer> buf, std::ostringstream& response, bool isHtml)
{
size_t len = response.str ().length (), offset = 0;
if (isHtml)
{
std::ostringstream header;
header << "HTTP/1.1 200 OK\r\n";
header << "Connection: close\r\n";
header << "Content-Length: " << boost::lexical_cast<std::string>(len) << "\r\n";
header << "Content-Type: application/json\r\n";
header << "Date: ";
std::time_t t = std::time (nullptr);
std::tm tm = *std::gmtime (&t);
header << std::put_time(&tm, "%a, %d %b %Y %T GMT") << "\r\n";
header << "\r\n";
offset = header.str ().size ();
memcpy (buf->data (), header.str ().c_str (), offset);
}
memcpy (buf->data () + offset, response.str ().c_str (), len);
boost::asio::async_write (*socket, boost::asio::buffer (buf->data (), offset + len),
boost::asio::transfer_all (),
std::bind(&I2PControlService::HandleResponseSent, this,
std::placeholders::_1, std::placeholders::_2, socket, buf));
}
void I2PControlService::HandleResponseSent (const boost::system::error_code& ecode, std::size_t bytes_transferred,
std::shared_ptr<ssl_socket> socket, std::shared_ptr<I2PControlBuffer> buf)
{
if (ecode) {
LogPrint (eLogError, "I2PControl: Write error: ", ecode.message ());
}
}
// handlers
void I2PControlService::AuthenticateHandler (const boost::property_tree::ptree& params, std::ostringstream& results)
{
int api = params.get<int> ("API");
auto password = params.get<std::string> ("Password");
LogPrint (eLogDebug, "I2PControl: Authenticate API=", api, " Password=", password);
if (password != m_Password) {
LogPrint (eLogError, "I2PControl: Authenticate - Invalid password: ", password);
return;
}
InsertParam (results, "API", api);
results << ",";
std::string token = boost::lexical_cast<std::string>(i2p::util::GetSecondsSinceEpoch ());
m_Tokens.insert (token);
InsertParam (results, "Token", token);
}
void I2PControlService::EchoHandler (const boost::property_tree::ptree& params, std::ostringstream& results)
{
auto echo = params.get<std::string> ("Echo");
LogPrint (eLogDebug, "I2PControl Echo Echo=", echo);
InsertParam (results, "Result", echo);
}
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// I2PControl
void I2PControlService::I2PControlHandler (const boost::property_tree::ptree& params, std::ostringstream& results)
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{
for (auto& it: params)
{
LogPrint (eLogDebug, "I2PControl: I2PControl request: ", it.first);
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auto it1 = m_I2PControlHandlers.find (it.first);
if (it1 != m_I2PControlHandlers.end ())
{
(this->*(it1->second))(it.second.data ());
InsertParam (results, it.first, "");
}
else
LogPrint (eLogError, "I2PControl: I2PControl unknown request: ", it.first);
}
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}
void I2PControlService::PasswordHandler (const std::string& value)
{
LogPrint (eLogWarning, "I2PControl: New password=", value, ", to make it persistent you should update your config!");
m_Password = value;
m_Tokens.clear ();
}
// RouterManager
void I2PControlService::RouterManagerHandler (const boost::property_tree::ptree& params, std::ostringstream& results)
{
for (auto it = params.begin (); it != params.end (); it++)
{
LogPrint (eLogDebug, "I2PControl: RouterManager request: ", it->first);
auto it1 = m_RouterManagerHandlers.find (it->first);
if (it1 != m_RouterManagerHandlers.end ())
{
if (it != params.begin ()) results << ",";
(this->*(it1->second))(results);
} else
LogPrint (eLogError, "I2PControl: RouterManager unknown request: ", it->first);
}
}
void I2PControlService::ShutdownHandler (std::ostringstream& results)
{
LogPrint (eLogInfo, "I2PControl: Shutdown requested");
InsertParam (results, "Shutdown", "");
m_ShutdownTimer.expires_from_now (boost::posix_time::seconds(1)); // 1 second to make sure response has been sent
m_ShutdownTimer.async_wait (
[](const boost::system::error_code& ecode)
{
Daemon.running = 0;
});
}
void I2PControlService::ShutdownGracefulHandler (std::ostringstream& results)
{
i2p::context.SetAcceptsTunnels (false);
int timeout = i2p::tunnel::tunnels.GetTransitTunnelsExpirationTimeout ();
LogPrint (eLogInfo, "I2PControl: Graceful shutdown requested, ", timeout, " seconds remains");
InsertParam (results, "ShutdownGraceful", "");
m_ShutdownTimer.expires_from_now (boost::posix_time::seconds(timeout + 1)); // + 1 second
m_ShutdownTimer.async_wait (
[](const boost::system::error_code& ecode)
{
Daemon.running = 0;
});
}
void I2PControlService::ReseedHandler (std::ostringstream& results)
{
LogPrint (eLogInfo, "I2PControl: Reseed requested");
InsertParam (results, "Reseed", "");
i2p::data::netdb.Reseed ();
}
// certificate
void I2PControlService::CreateCertificate (const char *crt_path, const char *key_path)
{
FILE *f = NULL;
EVP_PKEY * pkey = EVP_PKEY_new ();
RSA * rsa = RSA_new ();
BIGNUM * e = BN_dup (i2p::crypto::GetRSAE ());
RSA_generate_key_ex (rsa, 4096, e, NULL);
BN_free (e);
if (rsa)
{
EVP_PKEY_assign_RSA (pkey, rsa);
X509 * x509 = X509_new ();
ASN1_INTEGER_set (X509_get_serialNumber (x509), 1);
X509_gmtime_adj (X509_getm_notBefore (x509), 0);
X509_gmtime_adj (X509_getm_notAfter (x509), I2P_CONTROL_CERTIFICATE_VALIDITY*24*60*60); // expiration
X509_set_pubkey (x509, pkey); // public key
X509_NAME * name = X509_get_subject_name (x509);
X509_NAME_add_entry_by_txt (name, "C", MBSTRING_ASC, (unsigned char *)"A1", -1, -1, 0); // country (Anonymous proxy)
X509_NAME_add_entry_by_txt (name, "O", MBSTRING_ASC, (unsigned char *)I2P_CONTROL_CERTIFICATE_ORGANIZATION, -1, -1, 0); // organization
X509_NAME_add_entry_by_txt (name, "CN", MBSTRING_ASC, (unsigned char *)I2P_CONTROL_CERTIFICATE_COMMON_NAME, -1, -1, 0); // common name
X509_set_issuer_name (x509, name); // set issuer to ourselves
X509_sign (x509, pkey, EVP_sha1 ()); // sign, last param must be NULL for EdDSA
// save cert
if ((f = fopen (crt_path, "wb")) != NULL) {
LogPrint (eLogInfo, "I2PControl: Saving new cert to ", crt_path);
PEM_write_X509 (f, x509);
fclose (f);
} else {
LogPrint (eLogError, "I2PControl: Can't write cert: ", strerror(errno));
}
// save key
if ((f = fopen (key_path, "wb")) != NULL) {
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LogPrint (eLogInfo, "I2PControl: saving cert key to ", key_path);
PEM_write_PrivateKey (f, pkey, NULL, NULL, 0, NULL, NULL);
fclose (f);
} else {
LogPrint (eLogError, "I2PControl: Can't write key: ", strerror(errno));
}
X509_free (x509);
} else {
LogPrint (eLogError, "I2PControl: Can't create RSA key for certificate");
}
EVP_PKEY_free (pkey);
}
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}
}