#include #include #include #include #include #include #include #include #include "I2PService.h" #include "Destination.h" #include "HTTPProxy.h" #include "util.h" #include "Identity.h" #include "Streaming.h" #include "Destination.h" #include "ClientContext.h" #include "I2PEndian.h" #include "I2PTunnel.h" #include "Config.h" #include "HTTP.h" namespace i2p { namespace proxy { std::map jumpservices = { { "inr.i2p", "http://joajgazyztfssty4w2on5oaqksz6tqoxbduy553y34mf4byv6gpq.b32.i2p/search/?q=" }, { "stats.i2p", "http://7tbay5p4kzeekxvyvbf6v7eauazemsnnl2aoyqhg5jzpr5eke7tq.b32.i2p/cgi-bin/jump.cgi?a=" }, }; static const char *pageHead = "\r\n" " I2Pd HTTP proxy\r\n" " \r\n" "\r\n" ; bool str_rmatch(std::string & str, const char *suffix) { auto pos = str.rfind (suffix); if (pos == std::string::npos) return false; /* not found */ if (str.length() == (pos + std::strlen(suffix))) return true; /* match */ return false; } class HTTPReqHandler: public i2p::client::I2PServiceHandler, public std::enable_shared_from_this { private: bool HandleRequest(); void HandleSockRecv(const boost::system::error_code & ecode, std::size_t bytes_transfered); void Terminate(); void AsyncSockRead(); bool ExtractAddressHelper(i2p::http::URL & url, std::string & b64); void SanitizeHTTPRequest(i2p::http::HTTPReq & req); void SentHTTPFailed(const boost::system::error_code & ecode); void HandleStreamRequestComplete (std::shared_ptr stream); /* error helpers */ void GenericProxyError(const char *title, const char *description); void GenericProxyInfo(const char *title, const char *description); void HostNotFound(std::string & host); void SendProxyError(std::string & content); void ForwardToUpstreamProxy(); void HandleUpstreamHTTPProxyConnect(const boost::system::error_code & ec); void HandleUpstreamSocksProxyConnect(const boost::system::error_code & ec); void HTTPConnect(const std::string & host, uint16_t port); void HandleHTTPConnectStreamRequestComplete(std::shared_ptr stream); void HandleSocksProxySendHandshake(const boost::system::error_code & ec, std::size_t bytes_transfered); void HandleSocksProxyReply(const boost::system::error_code & ec, std::size_t bytes_transfered); typedef std::function ProxyResolvedHandler; void HandleUpstreamProxyResolved(const boost::system::error_code & ecode, boost::asio::ip::tcp::resolver::iterator itr, ProxyResolvedHandler handler); void SocksProxySuccess(); void HandoverToUpstreamProxy(); uint8_t m_recv_chunk[8192]; std::string m_recv_buf; // from client std::string m_send_buf; // to upstream std::shared_ptr m_sock; std::shared_ptr m_proxysock; boost::asio::ip::tcp::resolver m_proxy_resolver; i2p::http::URL m_ProxyURL; i2p::http::URL m_RequestURL; uint8_t m_socks_buf[255+8]; // for socks request/response ssize_t m_req_len; i2p::http::URL m_ClientRequestURL; i2p::http::HTTPReq m_ClientRequest; i2p::http::HTTPRes m_ClientResponse; std::stringstream m_ClientRequestBuffer; public: HTTPReqHandler(HTTPProxy * parent, std::shared_ptr sock) : I2PServiceHandler(parent), m_sock(sock), m_proxysock(std::make_shared(parent->GetService())), m_proxy_resolver(parent->GetService()) {} ~HTTPReqHandler() { Terminate(); } void Handle () { AsyncSockRead(); } /* overload */ }; void HTTPReqHandler::AsyncSockRead() { LogPrint(eLogDebug, "HTTPProxy: async sock read"); if (!m_sock) { LogPrint(eLogError, "HTTPProxy: no socket for read"); return; } m_sock->async_read_some(boost::asio::buffer(m_recv_chunk, sizeof(m_recv_chunk)), std::bind(&HTTPReqHandler::HandleSockRecv, shared_from_this(), std::placeholders::_1, std::placeholders::_2)); } void HTTPReqHandler::Terminate() { if (Kill()) return; if (m_sock) { LogPrint(eLogDebug, "HTTPProxy: close sock"); m_sock->close(); m_sock = nullptr; } if(m_proxysock) { LogPrint(eLogDebug, "HTTPProxy: close proxysock"); if(m_proxysock->is_open()) m_proxysock->close(); m_proxysock = nullptr; } Done(shared_from_this()); } void HTTPReqHandler::GenericProxyError(const char *title, const char *description) { std::stringstream ss; ss << "

Proxy error: " << title << "

\r\n"; ss << "

" << description << "

\r\n"; std::string content = ss.str(); SendProxyError(content); } void HTTPReqHandler::GenericProxyInfo(const char *title, const char *description) { std::stringstream ss; ss << "

Proxy info: " << title << "

\r\n"; ss << "

" << description << "

\r\n"; std::string content = ss.str(); SendProxyError(content); } void HTTPReqHandler::HostNotFound(std::string & host) { std::stringstream ss; ss << "

Proxy error: Host not found

\r\n" << "

Remote host not found in router's addressbook

\r\n" << "

You may try to find this host on jumpservices below:

\r\n" << "

" << js.first << "

\r\n"; std::string content = ss.str(); SendProxyError(content); } void HTTPReqHandler::SendProxyError(std::string & content) { i2p::http::HTTPRes res; res.code = 500; res.add_header("Content-Type", "text/html; charset=UTF-8"); res.add_header("Connection", "close"); std::stringstream ss; ss << "\r\n" << pageHead << "" << content << "\r\n" << "\r\n"; res.body = ss.str(); std::string response = res.to_string(); boost::asio::async_write(*m_sock, boost::asio::buffer(response), boost::asio::transfer_all(), std::bind(&HTTPReqHandler::SentHTTPFailed, shared_from_this(), std::placeholders::_1)); } bool HTTPReqHandler::ExtractAddressHelper(i2p::http::URL & url, std::string & b64) { const char *param = "i2paddresshelper="; std::size_t pos = url.query.find(param); std::size_t len = std::strlen(param); std::map params; if (pos == std::string::npos) return false; /* not found */ if (!url.parse_query(params)) return false; std::string value = params["i2paddresshelper"]; len += value.length(); b64 = i2p::http::UrlDecode(value); url.query.replace(pos, len, ""); return true; } void HTTPReqHandler::SanitizeHTTPRequest(i2p::http::HTTPReq & req) { /* drop common headers */ req.RemoveHeader("Referer"); req.RemoveHeader("Via"); req.RemoveHeader("From"); req.RemoveHeader("Forwarded"); req.RemoveHeader("Accept", "Accept-Encoding"); // Accept*, but Accept-Encoding /* drop proxy-disclosing headers */ req.RemoveHeader("X-Forwarded"); req.RemoveHeader("Proxy-"); // Proxy-* /* replace headers */ req.UpdateHeader("User-Agent", "MYOB/6.66 (AN/ON)"); /* add headers */ req.AddHeader("Connection", "close"); /* keep-alive conns not supported yet */ } /** * @brief Try to parse request from @a m_recv_buf * If parsing success, rebuild request and store to @a m_send_buf * with remaining data tail * @return true on processed request or false if more data needed */ bool HTTPReqHandler::HandleRequest() { std::string b64; m_req_len = m_ClientRequest.parse(m_recv_buf); if (m_req_len == 0) return false; /* need more data */ if (m_req_len < 0) { LogPrint(eLogError, "HTTPProxy: unable to parse request"); GenericProxyError("Invalid request", "Proxy unable to parse your request"); return true; /* parse error */ } /* parsing success, now let's look inside request */ LogPrint(eLogDebug, "HTTPProxy: requested: ", m_ClientRequest.uri); m_RequestURL.parse(m_ClientRequest.uri); if (ExtractAddressHelper(m_RequestURL, b64)) { bool addresshelper; i2p::config::GetOption("httpproxy.addresshelper", addresshelper); if (!addresshelper) { LogPrint(eLogWarning, "HTTPProxy: addresshelper disabled"); GenericProxyError("Invalid request", "adddresshelper is not supported"); return true; } i2p::client::context.GetAddressBook ().InsertAddress (m_RequestURL.host, b64); LogPrint (eLogInfo, "HTTPProxy: added b64 from addresshelper for ", m_RequestURL.host); std::string full_url = m_RequestURL.to_string(); std::stringstream ss; ss << "Host " << m_RequestURL.host << " added to router's addressbook from helper. " << "Click here to proceed."; GenericProxyInfo("Addresshelper found", ss.str().c_str()); return true; /* request processed */ } std::string dest_host; uint16_t dest_port; bool useConnect = false; if(m_ClientRequest.method == "CONNECT") { std::string uri(m_ClientRequest.uri); auto pos = uri.find(":"); if(pos == std::string::npos || pos == uri.size() - 1) { GenericProxyError("Invalid Request", "invalid request uri"); return true; } else { useConnect = true; dest_port = std::stoi(uri.substr(pos+1)); dest_host = uri.substr(0, pos); } } else { SanitizeHTTPRequest(m_ClientRequest); dest_host = m_RequestURL.host; dest_port = m_RequestURL.port; /* always set port, even if missing in request */ if (!dest_port) dest_port = (m_RequestURL.schema == "https") ? 443 : 80; /* detect dest_host, set proper 'Host' header in upstream request */ if (dest_host != "") { /* absolute url, replace 'Host' header */ std::string h = dest_host; if (dest_port != 0 && dest_port != 80) h += ":" + std::to_string(dest_port); m_ClientRequest.UpdateHeader("Host", h); } else { auto h = m_ClientRequest.GetHeader ("Host"); if (h.length () > 0) { /* relative url and 'Host' header provided. transparent proxy mode? */ i2p::http::URL u; std::string t = "http://" + h; u.parse(t); dest_host = u.host; dest_port = u.port; } else { /* relative url and missing 'Host' header */ GenericProxyError("Invalid request", "Can't detect destination host from request"); return true; } } } /* check dest_host really exists and inside I2P network */ i2p::data::IdentHash identHash; if (str_rmatch(dest_host, ".i2p")) { if (!i2p::client::context.GetAddressBook ().GetIdentHash (dest_host, identHash)) { HostNotFound(dest_host); return true; /* request processed */ } } else { std::string outproxyUrl; i2p::config::GetOption("httpproxy.outproxy", outproxyUrl); if(outproxyUrl.size()) { LogPrint (eLogDebug, "HTTPProxy: use outproxy ", outproxyUrl); if(m_ProxyURL.parse(outproxyUrl)) ForwardToUpstreamProxy(); else GenericProxyError("Outproxy failure", "bad outproxy settings"); } else { LogPrint (eLogWarning, "HTTPProxy: outproxy failure for ", dest_host, ": no outprxy enabled"); std::string message = "Host " + dest_host + " not inside I2P network, but outproxy is not enabled"; GenericProxyError("Outproxy failure", message.c_str()); } return true; } if(useConnect) { HTTPConnect(dest_host, dest_port); return true; } /* make relative url */ m_RequestURL.schema = ""; m_RequestURL.host = ""; m_ClientRequest.uri = m_RequestURL.to_string(); /* drop original request from recv buffer */ m_recv_buf.erase(0, m_req_len); /* build new buffer from modified request and data from original request */ m_send_buf = m_ClientRequest.to_string(); m_send_buf.append(m_recv_buf); /* connect to destination */ LogPrint(eLogDebug, "HTTPProxy: connecting to host ", dest_host, ":", dest_port); GetOwner()->CreateStream (std::bind (&HTTPReqHandler::HandleStreamRequestComplete, shared_from_this(), std::placeholders::_1), dest_host, dest_port); return true; } void HTTPReqHandler::ForwardToUpstreamProxy() { LogPrint(eLogDebug, "HTTPProxy: forward to upstream"); // build http requset m_ClientRequestURL = m_RequestURL; LogPrint(eLogDebug, "HTTPProxy: ", m_ClientRequestURL.host); m_ClientRequestURL.schema = ""; m_ClientRequestURL.host = ""; m_ClientRequest.uri = m_ClientRequestURL.to_string(); m_ClientRequest.write(m_ClientRequestBuffer); m_ClientRequestBuffer << m_recv_buf.substr(m_req_len); // assume http if empty schema if (m_ProxyURL.schema == "" || m_ProxyURL.schema == "http") { // handle upstream http proxy if (!m_ProxyURL.port) m_ProxyURL.port = 80; boost::asio::ip::tcp::resolver::query q(m_ProxyURL.host, std::to_string(m_ProxyURL.port)); m_proxy_resolver.async_resolve(q, std::bind(&HTTPReqHandler::HandleUpstreamProxyResolved, this, std::placeholders::_1, std::placeholders::_2, [&](boost::asio::ip::tcp::endpoint ep) { m_proxysock->async_connect(ep, std::bind(&HTTPReqHandler::HandleUpstreamHTTPProxyConnect, this, std::placeholders::_1)); })); } else if (m_ProxyURL.schema == "socks") { // handle upstream socks proxy if (!m_ProxyURL.port) m_ProxyURL.port = 9050; // default to tor default if not specified boost::asio::ip::tcp::resolver::query q(m_ProxyURL.host, std::to_string(m_ProxyURL.port)); m_proxy_resolver.async_resolve(q, std::bind(&HTTPReqHandler::HandleUpstreamProxyResolved, this, std::placeholders::_1, std::placeholders::_2, [&](boost::asio::ip::tcp::endpoint ep) { m_proxysock->async_connect(ep, std::bind(&HTTPReqHandler::HandleUpstreamSocksProxyConnect, this, std::placeholders::_1)); })); } else { // unknown type, complain GenericProxyError("unknown outproxy url", m_ProxyURL.to_string().c_str()); } } void HTTPReqHandler::HandleUpstreamProxyResolved(const boost::system::error_code & ec, boost::asio::ip::tcp::resolver::iterator it, ProxyResolvedHandler handler) { if(ec) GenericProxyError("cannot resolve upstream proxy", ec.message().c_str()); else handler(*it); } void HTTPReqHandler::HandleUpstreamSocksProxyConnect(const boost::system::error_code & ec) { if(!ec) { if(m_RequestURL.host.size() > 255) { GenericProxyError("hostname too long", m_RequestURL.host.c_str()); return; } uint16_t port = m_RequestURL.port; if(!port) port = 80; LogPrint(eLogDebug, "HTTPProxy: connected to socks upstream"); std::string host = m_RequestURL.host; std::size_t reqsize = 0; m_socks_buf[0] = '\x04'; m_socks_buf[1] = 1; htobe16buf(m_socks_buf+2, port); m_socks_buf[4] = 0; m_socks_buf[5] = 0; m_socks_buf[6] = 0; m_socks_buf[7] = 1; // user id m_socks_buf[8] = 'i'; m_socks_buf[9] = '2'; m_socks_buf[10] = 'p'; m_socks_buf[11] = 'd'; m_socks_buf[12] = 0; reqsize += 13; memcpy(m_socks_buf+ reqsize, host.c_str(), host.size()); reqsize += host.size(); m_socks_buf[++reqsize] = 0; boost::asio::async_write(*m_proxysock, boost::asio::buffer(m_socks_buf, reqsize), boost::asio::transfer_all(), std::bind(&HTTPReqHandler::HandleSocksProxySendHandshake, this, std::placeholders::_1, std::placeholders::_2)); } else GenericProxyError("cannot connect to upstream socks proxy", ec.message().c_str()); } void HTTPReqHandler::HandleSocksProxySendHandshake(const boost::system::error_code & ec, std::size_t bytes_transferred) { LogPrint(eLogDebug, "HTTPProxy: upstream socks handshake sent"); if(ec) GenericProxyError("Cannot negotiate with socks proxy", ec.message().c_str()); else m_proxysock->async_read_some(boost::asio::buffer(m_socks_buf, 8), std::bind(&HTTPReqHandler::HandleSocksProxyReply, this, std::placeholders::_1, std::placeholders::_2)); } void HTTPReqHandler::HandoverToUpstreamProxy() { LogPrint(eLogDebug, "HTTPProxy: handover to socks proxy"); auto connection = std::make_shared(GetOwner(), m_proxysock, m_sock); m_sock = nullptr; m_proxysock = nullptr; GetOwner()->AddHandler(connection); connection->Start(); Terminate(); } void HTTPReqHandler::HTTPConnect(const std::string & host, uint16_t port) { std::string hostname(host); if(str_rmatch(hostname, ".i2p")) GetOwner()->CreateStream (std::bind (&HTTPReqHandler::HandleHTTPConnectStreamRequestComplete, shared_from_this(), std::placeholders::_1), host, port); else ForwardToUpstreamProxy(); } void HTTPReqHandler::HandleHTTPConnectStreamRequestComplete(std::shared_ptr stream) { if(stream) { m_ClientResponse.code = 101; m_ClientResponse.status = "Switching Protocols"; m_send_buf = m_ClientResponse.to_string(); boost::asio::async_write(*m_sock, boost::asio::buffer(m_send_buf), boost::asio::transfer_all(), [&] (const boost::system::error_code & ec, std::size_t transferred) { if(ec) { LogPrint(eLogError, "HTTPProxy: failed to send reply: ", ec.message()); } else { auto connection = std::make_shared(GetOwner(), m_sock, stream); GetOwner()->AddHandler(connection); connection->I2PConnect(); } Done(shared_from_this()); }); } else { GenericProxyError("CONNECT error", "Failed to Connect"); } } void HTTPReqHandler::SocksProxySuccess() { if(m_ClientRequest.method == "CONNECT") { m_ClientResponse.code = 200; m_send_buf = m_ClientResponse.to_string(); boost::asio::async_write(*m_sock, boost::asio::buffer(m_send_buf), boost::asio::transfer_all(), [&] (const boost::system::error_code & ec, std::size_t transferred) { if(ec) GenericProxyError("socks proxy error", ec.message().c_str()); else HandoverToUpstreamProxy(); }); } else { m_send_buf = m_ClientRequestBuffer.str(); LogPrint(eLogDebug, "HTTPProxy: send ", m_send_buf.size(), " bytes"); boost::asio::async_write(*m_proxysock, boost::asio::buffer(m_send_buf), boost::asio::transfer_all(), [&](const boost::system::error_code & ec, std::size_t transferred) { if(ec) GenericProxyError("failed to send request to upstream", ec.message().c_str()); else HandoverToUpstreamProxy(); }); } } void HTTPReqHandler::HandleSocksProxyReply(const boost::system::error_code & ec, std::size_t bytes_transferred) { if(!ec) { if(m_socks_buf[1] == 90) { // success SocksProxySuccess(); } else { std::stringstream ss; ss << "error code: "; ss << (int) m_socks_buf[1]; std::string msg = ss.str(); GenericProxyError("Socks Proxy error", msg.c_str()); } } else GenericProxyError("No Reply From socks proxy", ec.message().c_str()); } void HTTPReqHandler::HandleUpstreamHTTPProxyConnect(const boost::system::error_code & ec) { if(!ec) { LogPrint(eLogDebug, "HTTPProxy: connected to http upstream"); GenericProxyError("cannot connect", "http out proxy not implemented"); } else GenericProxyError("cannot connect to upstream http proxy", ec.message().c_str()); } /* will be called after some data received from client */ void HTTPReqHandler::HandleSockRecv(const boost::system::error_code & ecode, std::size_t len) { LogPrint(eLogDebug, "HTTPProxy: sock recv: ", len, " bytes, recv buf: ", m_recv_buf.length(), ", send buf: ", m_send_buf.length()); if(ecode) { LogPrint(eLogWarning, "HTTPProxy: sock recv got error: ", ecode); Terminate(); return; } m_recv_buf.append(reinterpret_cast(m_recv_chunk), len); if (HandleRequest()) { m_recv_buf.clear(); return; } AsyncSockRead(); } void HTTPReqHandler::SentHTTPFailed(const boost::system::error_code & ecode) { if (ecode) LogPrint (eLogError, "HTTPProxy: Closing socket after sending failure because: ", ecode.message ()); Terminate(); } void HTTPReqHandler::HandleStreamRequestComplete (std::shared_ptr stream) { if (!stream) { LogPrint (eLogError, "HTTPProxy: error when creating the stream, check the previous warnings for more info"); GenericProxyError("Host is down", "Can't create connection to requested host, it may be down"); return; } if (Kill()) return; LogPrint (eLogDebug, "HTTPProxy: Created new I2PTunnel stream, sSID=", stream->GetSendStreamID(), ", rSID=", stream->GetRecvStreamID()); auto connection = std::make_shared(GetOwner(), m_sock, stream); GetOwner()->AddHandler (connection); connection->I2PConnect (reinterpret_cast(m_send_buf.data()), m_send_buf.length()); Done (shared_from_this()); } HTTPProxy::HTTPProxy(const std::string& address, int port, std::shared_ptr localDestination): TCPIPAcceptor(address, port, localDestination ? localDestination : i2p::client::context.GetSharedLocalDestination ()) { } std::shared_ptr HTTPProxy::CreateHandler(std::shared_ptr socket) { return std::make_shared (this, socket); } } // http } // i2p