privacy: Stream isolation for Tor
According to Tor's extensions to the SOCKS protocol (https://gitweb.torproject.org/torspec.git/tree/socks-extensions.txt) it is possible to perform stream isolation by providing authentication to the proxy. Each set of credentials will create a new circuit, which makes it harder to correlate connections. This patch adds an option, `-proxyrandomize` (on by default) that randomizes credentials for every outgoing connection, thus creating a new circuit. 2015-03-16 15:29:59 SOCKS5 Sending proxy authentication 3842137544:3256031132
This commit is contained in:
parent
8f955b9661
commit
67a7949397
6 changed files with 134 additions and 84 deletions
13
src/init.cpp
13
src/init.cpp
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@ -301,6 +301,7 @@ std::string HelpMessage(HelpMessageMode mode)
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strUsage += HelpMessageOpt("-permitbaremultisig", strprintf(_("Relay non-P2SH multisig (default: %u)"), 1));
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strUsage += HelpMessageOpt("-port=<port>", strprintf(_("Listen for connections on <port> (default: %u or testnet: %u)"), 8333, 18333));
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strUsage += HelpMessageOpt("-proxy=<ip:port>", _("Connect through SOCKS5 proxy"));
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strUsage += HelpMessageOpt("-proxyrandomize", strprintf(_("Randomize credentials for every proxy connection. This enables Tor stream isolation (default: %u)"), 1));
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strUsage += HelpMessageOpt("-seednode=<ip>", _("Connect to a node to retrieve peer addresses, and disconnect"));
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strUsage += HelpMessageOpt("-timeout=<n>", strprintf(_("Specify connection timeout in milliseconds (minimum: 1, default: %d)"), DEFAULT_CONNECT_TIMEOUT));
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#ifdef USE_UPNP
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@ -351,7 +352,7 @@ std::string HelpMessage(HelpMessageMode mode)
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strUsage += HelpMessageOpt("-flushwallet", strprintf(_("Run a thread to flush wallet periodically (default: %u)"), 1));
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strUsage += HelpMessageOpt("-stopafterblockimport", strprintf(_("Stop running after importing blocks from disk (default: %u)"), 0));
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}
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string debugCategories = "addrman, alert, bench, coindb, db, lock, rand, rpc, selectcoins, mempool, net"; // Don't translate these and qt below
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string debugCategories = "addrman, alert, bench, coindb, db, lock, rand, rpc, selectcoins, mempool, net, proxy"; // Don't translate these and qt below
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if (mode == HMM_BITCOIN_QT)
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debugCategories += ", qt";
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strUsage += HelpMessageOpt("-debug=<category>", strprintf(_("Output debugging information (default: %u, supplying <category> is optional)"), 0) + ". " +
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@ -891,10 +892,10 @@ bool AppInit2(boost::thread_group& threadGroup)
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}
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}
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CService addrProxy;
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proxyType addrProxy;
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bool fProxy = false;
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if (mapArgs.count("-proxy")) {
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addrProxy = CService(mapArgs["-proxy"], 9050);
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addrProxy = proxyType(CService(mapArgs["-proxy"], 9050), GetArg("-proxyrandomize", true));
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if (!addrProxy.IsValid())
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return InitError(strprintf(_("Invalid -proxy address: '%s'"), mapArgs["-proxy"]));
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@ -904,14 +905,14 @@ bool AppInit2(boost::thread_group& threadGroup)
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fProxy = true;
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}
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// -onion can override normal proxy, -noonion disables tor entirely
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// -onion can override normal proxy, -noonion disables connecting to .onion entirely
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if (!(mapArgs.count("-onion") && mapArgs["-onion"] == "0") &&
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(fProxy || mapArgs.count("-onion"))) {
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CService addrOnion;
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proxyType addrOnion;
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if (!mapArgs.count("-onion"))
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addrOnion = addrProxy;
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else
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addrOnion = CService(mapArgs["-onion"], 9050);
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addrOnion = proxyType(CService(mapArgs["-onion"], 9050), GetArg("-proxyrandomize", true));
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if (!addrOnion.IsValid())
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return InitError(strprintf(_("Invalid -onion address: '%s'"), mapArgs["-onion"]));
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SetProxy(NET_TOR, addrOnion);
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180
src/netbase.cpp
180
src/netbase.cpp
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@ -12,6 +12,7 @@
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#include "hash.h"
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#include "sync.h"
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#include "uint256.h"
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#include "random.h"
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#include "util.h"
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#include "utilstrencodings.h"
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@ -38,7 +39,7 @@ using namespace std;
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// Settings
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static proxyType proxyInfo[NET_MAX];
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static CService nameProxy;
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static proxyType nameProxy;
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static CCriticalSection cs_proxyInfos;
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int nConnectTimeout = DEFAULT_CONNECT_TIMEOUT;
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bool fNameLookup = false;
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@ -285,59 +286,100 @@ bool static InterruptibleRecv(char* data, size_t len, int timeout, SOCKET& hSock
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return len == 0;
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}
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bool static Socks5(string strDest, int port, SOCKET& hSocket)
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struct ProxyCredentials
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{
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std::string username;
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std::string password;
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};
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/** Connect using SOCKS5 (as described in RFC1928) */
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bool static Socks5(string strDest, int port, const ProxyCredentials *auth, SOCKET& hSocket)
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{
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LogPrintf("SOCKS5 connecting %s\n", strDest);
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if (strDest.size() > 255)
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{
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if (strDest.size() > 255) {
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CloseSocket(hSocket);
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return error("Hostname too long");
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}
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char pszSocks5Init[] = "\5\1\0";
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ssize_t nSize = sizeof(pszSocks5Init) - 1;
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ssize_t ret = send(hSocket, pszSocks5Init, nSize, MSG_NOSIGNAL);
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if (ret != nSize)
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{
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// Accepted authentication methods
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std::vector<uint8_t> vSocks5Init;
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vSocks5Init.push_back(0x05);
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if (auth) {
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vSocks5Init.push_back(0x02); // # METHODS
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vSocks5Init.push_back(0x00); // X'00' NO AUTHENTICATION REQUIRED
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vSocks5Init.push_back(0x02); // X'02' USERNAME/PASSWORD (RFC1929)
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} else {
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vSocks5Init.push_back(0x01); // # METHODS
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vSocks5Init.push_back(0x00); // X'00' NO AUTHENTICATION REQUIRED
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}
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ssize_t ret = send(hSocket, (const char*)begin_ptr(vSocks5Init), vSocks5Init.size(), MSG_NOSIGNAL);
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if (ret != (ssize_t)vSocks5Init.size()) {
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CloseSocket(hSocket);
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return error("Error sending to proxy");
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}
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char pchRet1[2];
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if (!InterruptibleRecv(pchRet1, 2, SOCKS5_RECV_TIMEOUT, hSocket))
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{
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if (!InterruptibleRecv(pchRet1, 2, SOCKS5_RECV_TIMEOUT, hSocket)) {
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CloseSocket(hSocket);
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return error("Error reading proxy response");
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}
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if (pchRet1[0] != 0x05 || pchRet1[1] != 0x00)
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{
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if (pchRet1[0] != 0x05) {
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CloseSocket(hSocket);
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return error("Proxy failed to initialize");
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}
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string strSocks5("\5\1");
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strSocks5 += '\000'; strSocks5 += '\003';
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strSocks5 += static_cast<char>(std::min((int)strDest.size(), 255));
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strSocks5 += strDest;
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strSocks5 += static_cast<char>((port >> 8) & 0xFF);
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strSocks5 += static_cast<char>((port >> 0) & 0xFF);
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ret = send(hSocket, strSocks5.data(), strSocks5.size(), MSG_NOSIGNAL);
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if (ret != (ssize_t)strSocks5.size())
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{
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if (pchRet1[1] == 0x02 && auth) {
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// Perform username/password authentication (as described in RFC1929)
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std::vector<uint8_t> vAuth;
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vAuth.push_back(0x01);
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if (auth->username.size() > 255 || auth->password.size() > 255)
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return error("Proxy username or password too long");
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vAuth.push_back(auth->username.size());
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vAuth.insert(vAuth.end(), auth->username.begin(), auth->username.end());
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vAuth.push_back(auth->password.size());
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vAuth.insert(vAuth.end(), auth->password.begin(), auth->password.end());
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ret = send(hSocket, (const char*)begin_ptr(vAuth), vAuth.size(), MSG_NOSIGNAL);
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if (ret != (ssize_t)vAuth.size()) {
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CloseSocket(hSocket);
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return error("Error sending authentication to proxy");
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}
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LogPrint("proxy", "SOCKS5 sending proxy authentication %s:%s\n", auth->username, auth->password);
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char pchRetA[2];
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if (!InterruptibleRecv(pchRetA, 2, SOCKS5_RECV_TIMEOUT, hSocket)) {
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CloseSocket(hSocket);
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return error("Error reading proxy authentication response");
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}
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if (pchRetA[0] != 0x01 || pchRetA[1] != 0x00) {
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CloseSocket(hSocket);
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return error("Proxy authentication unsuccesful");
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}
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} else if (pchRet1[1] == 0x00) {
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// Perform no authentication
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} else {
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CloseSocket(hSocket);
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return error("Proxy requested wrong authentication method %02x", pchRet1[1]);
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}
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std::vector<uint8_t> vSocks5;
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vSocks5.push_back(0x05); // VER protocol version
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vSocks5.push_back(0x01); // CMD CONNECT
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vSocks5.push_back(0x00); // RSV Reserved
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vSocks5.push_back(0x03); // ATYP DOMAINNAME
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vSocks5.push_back(strDest.size()); // Length<=255 is checked at beginning of function
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vSocks5.insert(vSocks5.end(), strDest.begin(), strDest.end());
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vSocks5.push_back((port >> 8) & 0xFF);
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vSocks5.push_back((port >> 0) & 0xFF);
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ret = send(hSocket, (const char*)begin_ptr(vSocks5), vSocks5.size(), MSG_NOSIGNAL);
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if (ret != (ssize_t)vSocks5.size()) {
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CloseSocket(hSocket);
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return error("Error sending to proxy");
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}
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char pchRet2[4];
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if (!InterruptibleRecv(pchRet2, 4, SOCKS5_RECV_TIMEOUT, hSocket))
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{
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if (!InterruptibleRecv(pchRet2, 4, SOCKS5_RECV_TIMEOUT, hSocket)) {
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CloseSocket(hSocket);
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return error("Error reading proxy response");
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}
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if (pchRet2[0] != 0x05)
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{
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if (pchRet2[0] != 0x05) {
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CloseSocket(hSocket);
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return error("Proxy failed to accept request");
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}
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if (pchRet2[1] != 0x00)
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{
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if (pchRet2[1] != 0x00) {
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CloseSocket(hSocket);
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switch (pchRet2[1])
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{
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@ -352,8 +394,7 @@ bool static Socks5(string strDest, int port, SOCKET& hSocket)
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default: return error("Proxy error: unknown");
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}
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}
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if (pchRet2[2] != 0x00)
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{
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if (pchRet2[2] != 0x00) {
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CloseSocket(hSocket);
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return error("Error: malformed proxy response");
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}
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@ -375,13 +416,11 @@ bool static Socks5(string strDest, int port, SOCKET& hSocket)
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}
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default: CloseSocket(hSocket); return error("Error: malformed proxy response");
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}
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if (!ret)
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{
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if (!ret) {
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CloseSocket(hSocket);
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return error("Error reading from proxy");
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}
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if (!InterruptibleRecv(pchRet3, 2, SOCKS5_RECV_TIMEOUT, hSocket))
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{
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if (!InterruptibleRecv(pchRet3, 2, SOCKS5_RECV_TIMEOUT, hSocket)) {
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CloseSocket(hSocket);
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return error("Error reading from proxy");
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}
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@ -471,7 +510,7 @@ bool static ConnectSocketDirectly(const CService &addrConnect, SOCKET& hSocketRe
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return true;
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}
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bool SetProxy(enum Network net, CService addrProxy) {
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bool SetProxy(enum Network net, const proxyType &addrProxy) {
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assert(net >= 0 && net < NET_MAX);
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if (!addrProxy.IsValid())
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return false;
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@ -489,7 +528,7 @@ bool GetProxy(enum Network net, proxyType &proxyInfoOut) {
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return true;
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}
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bool SetNameProxy(CService addrProxy) {
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bool SetNameProxy(const proxyType &addrProxy) {
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if (!addrProxy.IsValid())
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return false;
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LOCK(cs_proxyInfos);
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return true;
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}
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bool GetNameProxy(CService &nameProxyOut) {
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bool GetNameProxy(proxyType &nameProxyOut) {
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LOCK(cs_proxyInfos);
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if(!nameProxy.IsValid())
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return false;
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@ -513,35 +552,47 @@ bool HaveNameProxy() {
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bool IsProxy(const CNetAddr &addr) {
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LOCK(cs_proxyInfos);
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for (int i = 0; i < NET_MAX; i++) {
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if (addr == (CNetAddr)proxyInfo[i])
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if (addr == (CNetAddr)proxyInfo[i].proxy)
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return true;
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}
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return false;
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}
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static bool ConnectThroughProxy(const proxyType &proxy, const std::string strDest, int port, SOCKET& hSocketRet, int nTimeout, bool *outProxyConnectionFailed)
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{
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SOCKET hSocket = INVALID_SOCKET;
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// first connect to proxy server
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if (!ConnectSocketDirectly(proxy.proxy, hSocket, nTimeout)) {
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if (outProxyConnectionFailed)
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*outProxyConnectionFailed = true;
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return false;
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}
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// do socks negotiation
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if (proxy.randomize_credentials) {
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ProxyCredentials random_auth;
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random_auth.username = strprintf("%i", insecure_rand());
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random_auth.password = strprintf("%i", insecure_rand());
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if (!Socks5(strDest, (unsigned short)port, &random_auth, hSocket))
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return false;
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} else {
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if (!Socks5(strDest, (unsigned short)port, 0, hSocket))
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return false;
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}
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hSocketRet = hSocket;
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return true;
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}
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bool ConnectSocket(const CService &addrDest, SOCKET& hSocketRet, int nTimeout, bool *outProxyConnectionFailed)
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{
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proxyType proxy;
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if (outProxyConnectionFailed)
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*outProxyConnectionFailed = false;
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// no proxy needed (none set for target network)
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if (!GetProxy(addrDest.GetNetwork(), proxy))
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if (GetProxy(addrDest.GetNetwork(), proxy))
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return ConnectThroughProxy(proxy, addrDest.ToStringIP(), addrDest.GetPort(), hSocketRet, nTimeout, outProxyConnectionFailed);
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else // no proxy needed (none set for target network)
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return ConnectSocketDirectly(addrDest, hSocketRet, nTimeout);
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SOCKET hSocket = INVALID_SOCKET;
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// first connect to proxy server
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if (!ConnectSocketDirectly(proxy, hSocket, nTimeout)) {
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if (outProxyConnectionFailed)
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*outProxyConnectionFailed = true;
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return false;
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}
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// do socks negotiation
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if (!Socks5(addrDest.ToStringIP(), addrDest.GetPort(), hSocket))
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return false;
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hSocketRet = hSocket;
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return true;
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}
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bool ConnectSocketByName(CService &addr, SOCKET& hSocketRet, const char *pszDest, int portDefault, int nTimeout, bool *outProxyConnectionFailed)
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SplitHostPort(string(pszDest), port, strDest);
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SOCKET hSocket = INVALID_SOCKET;
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CService nameProxy;
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proxyType nameProxy;
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GetNameProxy(nameProxy);
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CService addrResolved(CNetAddr(strDest, fNameLookup && !HaveNameProxy()), port);
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@ -569,18 +618,7 @@ bool ConnectSocketByName(CService &addr, SOCKET& hSocketRet, const char *pszDest
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if (!HaveNameProxy())
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return false;
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// first connect to name proxy server
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if (!ConnectSocketDirectly(nameProxy, hSocket, nTimeout)) {
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if (outProxyConnectionFailed)
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*outProxyConnectionFailed = true;
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return false;
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}
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// do socks negotiation
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if (!Socks5(strDest, (unsigned short)port, hSocket))
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return false;
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hSocketRet = hSocket;
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return true;
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return ConnectThroughProxy(nameProxy, strDest, port, hSocketRet, nTimeout, outProxyConnectionFailed);
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}
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void CNetAddr::Init()
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@ -168,15 +168,25 @@ class CService : public CNetAddr
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}
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};
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typedef CService proxyType;
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class proxyType
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{
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public:
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proxyType(): randomize_credentials(false) {}
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proxyType(const CService &proxy, bool randomize_credentials=false): proxy(proxy), randomize_credentials(randomize_credentials) {}
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bool IsValid() const { return proxy.IsValid(); }
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CService proxy;
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bool randomize_credentials;
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};
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enum Network ParseNetwork(std::string net);
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std::string GetNetworkName(enum Network net);
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void SplitHostPort(std::string in, int &portOut, std::string &hostOut);
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bool SetProxy(enum Network net, CService addrProxy);
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bool SetProxy(enum Network net, const proxyType &addrProxy);
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bool GetProxy(enum Network net, proxyType &proxyInfoOut);
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bool IsProxy(const CNetAddr &addr);
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bool SetNameProxy(CService addrProxy);
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bool SetNameProxy(const proxyType &addrProxy);
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bool HaveNameProxy();
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bool LookupHost(const char *pszName, std::vector<CNetAddr>& vIP, unsigned int nMaxSolutions = 0, bool fAllowLookup = true);
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bool Lookup(const char *pszName, CService& addr, int portDefault = 0, bool fAllowLookup = true);
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@ -335,8 +335,8 @@ bool OptionsModel::getProxySettings(QNetworkProxy& proxy) const
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proxyType curProxy;
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if (GetProxy(NET_IPV4, curProxy)) {
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proxy.setType(QNetworkProxy::Socks5Proxy);
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proxy.setHostName(QString::fromStdString(curProxy.ToStringIP()));
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proxy.setPort(curProxy.GetPort());
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proxy.setHostName(QString::fromStdString(curProxy.proxy.ToStringIP()));
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proxy.setPort(curProxy.proxy.GetPort());
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return true;
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}
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@ -90,7 +90,7 @@ Value getinfo(const Array& params, bool fHelp)
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obj.push_back(Pair("blocks", (int)chainActive.Height()));
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obj.push_back(Pair("timeoffset", GetTimeOffset()));
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obj.push_back(Pair("connections", (int)vNodes.size()));
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obj.push_back(Pair("proxy", (proxy.IsValid() ? proxy.ToStringIPPort() : string())));
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obj.push_back(Pair("proxy", (proxy.IsValid() ? proxy.proxy.ToStringIPPort() : string())));
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obj.push_back(Pair("difficulty", (double)GetDifficulty()));
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obj.push_back(Pair("testnet", Params().TestnetToBeDeprecatedFieldRPC()));
|
||||
#ifdef ENABLE_WALLET
|
||||
|
|
|
@ -371,7 +371,8 @@ static Array GetNetworksInfo()
|
|||
obj.push_back(Pair("name", GetNetworkName(network)));
|
||||
obj.push_back(Pair("limited", IsLimited(network)));
|
||||
obj.push_back(Pair("reachable", IsReachable(network)));
|
||||
obj.push_back(Pair("proxy", proxy.IsValid() ? proxy.ToStringIPPort() : string()));
|
||||
obj.push_back(Pair("proxy", proxy.IsValid() ? proxy.proxy.ToStringIPPort() : string()));
|
||||
obj.push_back(Pair("proxy_randomize_credentials", proxy.randomize_credentials));
|
||||
networks.push_back(obj);
|
||||
}
|
||||
return networks;
|
||||
|
|
Loading…
Reference in a new issue