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# 1 : : // Copyright (c) 2015-2020 The Bitcoin Core developers
# 2 : : // Copyright (c) 2017 The Zcash developers
# 3 : : // Distributed under the MIT software license, see the accompanying
# 4 : : // file COPYING or http://www.opensource.org/licenses/mit-license.php.
# 5 : :
# 6 : : #include <torcontrol.h>
# 7 : :
# 8 : : #include <chainparams.h>
# 9 : : #include <chainparamsbase.h>
# 10 : : #include <compat.h>
# 11 : : #include <crypto/hmac_sha256.h>
# 12 : : #include <net.h>
# 13 : : #include <netaddress.h>
# 14 : : #include <netbase.h>
# 15 : : #include <util/readwritefile.h>
# 16 : : #include <util/strencodings.h>
# 17 : : #include <util/system.h>
# 18 : : #include <util/thread.h>
# 19 : : #include <util/time.h>
# 20 : :
# 21 : : #include <deque>
# 22 : : #include <functional>
# 23 : : #include <set>
# 24 : : #include <stdlib.h>
# 25 : : #include <vector>
# 26 : :
# 27 : : #include <boost/signals2/signal.hpp>
# 28 : : #include <boost/algorithm/string/split.hpp>
# 29 : : #include <boost/algorithm/string/classification.hpp>
# 30 : : #include <boost/algorithm/string/replace.hpp>
# 31 : :
# 32 : : #include <event2/bufferevent.h>
# 33 : : #include <event2/buffer.h>
# 34 : : #include <event2/util.h>
# 35 : : #include <event2/event.h>
# 36 : : #include <event2/thread.h>
# 37 : :
# 38 : : /** Default control port */
# 39 : : const std::string DEFAULT_TOR_CONTROL = "127.0.0.1:9051";
# 40 : : /** Tor cookie size (from control-spec.txt) */
# 41 : : static const int TOR_COOKIE_SIZE = 32;
# 42 : : /** Size of client/server nonce for SAFECOOKIE */
# 43 : : static const int TOR_NONCE_SIZE = 32;
# 44 : : /** For computing serverHash in SAFECOOKIE */
# 45 : : static const std::string TOR_SAFE_SERVERKEY = "Tor safe cookie authentication server-to-controller hash";
# 46 : : /** For computing clientHash in SAFECOOKIE */
# 47 : : static const std::string TOR_SAFE_CLIENTKEY = "Tor safe cookie authentication controller-to-server hash";
# 48 : : /** Exponential backoff configuration - initial timeout in seconds */
# 49 : : static const float RECONNECT_TIMEOUT_START = 1.0;
# 50 : : /** Exponential backoff configuration - growth factor */
# 51 : : static const float RECONNECT_TIMEOUT_EXP = 1.5;
# 52 : : /** Maximum length for lines received on TorControlConnection.
# 53 : : * tor-control-spec.txt mentions that there is explicitly no limit defined to line length,
# 54 : : * this is belt-and-suspenders sanity limit to prevent memory exhaustion.
# 55 : : */
# 56 : : static const int MAX_LINE_LENGTH = 100000;
# 57 : :
# 58 : : /****** Low-level TorControlConnection ********/
# 59 : :
# 60 : : TorControlConnection::TorControlConnection(struct event_base *_base):
# 61 : : base(_base), b_conn(nullptr)
# 62 : 0 : {
# 63 : 0 : }
# 64 : :
# 65 : : TorControlConnection::~TorControlConnection()
# 66 : 0 : {
# 67 [ # # ]: 0 : if (b_conn)
# 68 : 0 : bufferevent_free(b_conn);
# 69 : 0 : }
# 70 : :
# 71 : : void TorControlConnection::readcb(struct bufferevent *bev, void *ctx)
# 72 : 0 : {
# 73 : 0 : TorControlConnection *self = static_cast<TorControlConnection*>(ctx);
# 74 : 0 : struct evbuffer *input = bufferevent_get_input(bev);
# 75 : 0 : size_t n_read_out = 0;
# 76 : 0 : char *line;
# 77 : 0 : assert(input);
# 78 : : // If there is not a whole line to read, evbuffer_readln returns nullptr
# 79 [ # # ]: 0 : while((line = evbuffer_readln(input, &n_read_out, EVBUFFER_EOL_CRLF)) != nullptr)
# 80 : 0 : {
# 81 : 0 : std::string s(line, n_read_out);
# 82 : 0 : free(line);
# 83 [ # # ]: 0 : if (s.size() < 4) // Short line
# 84 : 0 : continue;
# 85 : : // <status>(-|+| )<data><CRLF>
# 86 : 0 : self->message.code = atoi(s.substr(0,3));
# 87 : 0 : self->message.lines.push_back(s.substr(4));
# 88 : 0 : char ch = s[3]; // '-','+' or ' '
# 89 [ # # ]: 0 : if (ch == ' ') {
# 90 : : // Final line, dispatch reply and clean up
# 91 [ # # ]: 0 : if (self->message.code >= 600) {
# 92 : : // Dispatch async notifications to async handler
# 93 : : // Synchronous and asynchronous messages are never interleaved
# 94 : 0 : self->async_handler(*self, self->message);
# 95 : 0 : } else {
# 96 [ # # ]: 0 : if (!self->reply_handlers.empty()) {
# 97 : : // Invoke reply handler with message
# 98 : 0 : self->reply_handlers.front()(*self, self->message);
# 99 : 0 : self->reply_handlers.pop_front();
# 100 : 0 : } else {
# 101 [ # # ]: 0 : LogPrint(BCLog::TOR, "tor: Received unexpected sync reply %i\n", self->message.code);
# 102 : 0 : }
# 103 : 0 : }
# 104 : 0 : self->message.Clear();
# 105 : 0 : }
# 106 : 0 : }
# 107 : : // Check for size of buffer - protect against memory exhaustion with very long lines
# 108 : : // Do this after evbuffer_readln to make sure all full lines have been
# 109 : : // removed from the buffer. Everything left is an incomplete line.
# 110 [ # # ]: 0 : if (evbuffer_get_length(input) > MAX_LINE_LENGTH) {
# 111 : 0 : LogPrintf("tor: Disconnecting because MAX_LINE_LENGTH exceeded\n");
# 112 : 0 : self->Disconnect();
# 113 : 0 : }
# 114 : 0 : }
# 115 : :
# 116 : : void TorControlConnection::eventcb(struct bufferevent *bev, short what, void *ctx)
# 117 : 0 : {
# 118 : 0 : TorControlConnection *self = static_cast<TorControlConnection*>(ctx);
# 119 [ # # ]: 0 : if (what & BEV_EVENT_CONNECTED) {
# 120 [ # # ]: 0 : LogPrint(BCLog::TOR, "tor: Successfully connected!\n");
# 121 : 0 : self->connected(*self);
# 122 [ # # ]: 0 : } else if (what & (BEV_EVENT_EOF|BEV_EVENT_ERROR)) {
# 123 [ # # ]: 0 : if (what & BEV_EVENT_ERROR) {
# 124 [ # # ]: 0 : LogPrint(BCLog::TOR, "tor: Error connecting to Tor control socket\n");
# 125 : 0 : } else {
# 126 [ # # ]: 0 : LogPrint(BCLog::TOR, "tor: End of stream\n");
# 127 : 0 : }
# 128 : 0 : self->Disconnect();
# 129 : 0 : self->disconnected(*self);
# 130 : 0 : }
# 131 : 0 : }
# 132 : :
# 133 : : bool TorControlConnection::Connect(const std::string& tor_control_center, const ConnectionCB& _connected, const ConnectionCB& _disconnected)
# 134 : 0 : {
# 135 [ # # ]: 0 : if (b_conn)
# 136 : 0 : Disconnect();
# 137 : : // Parse tor_control_center address:port
# 138 : 0 : struct sockaddr_storage connect_to_addr;
# 139 : 0 : int connect_to_addrlen = sizeof(connect_to_addr);
# 140 [ # # ]: 0 : if (evutil_parse_sockaddr_port(tor_control_center.c_str(),
# 141 : 0 : (struct sockaddr*)&connect_to_addr, &connect_to_addrlen)<0) {
# 142 : 0 : LogPrintf("tor: Error parsing socket address %s\n", tor_control_center);
# 143 : 0 : return false;
# 144 : 0 : }
# 145 : :
# 146 : : // Create a new socket, set up callbacks and enable notification bits
# 147 : 0 : b_conn = bufferevent_socket_new(base, -1, BEV_OPT_CLOSE_ON_FREE);
# 148 [ # # ]: 0 : if (!b_conn)
# 149 : 0 : return false;
# 150 : 0 : bufferevent_setcb(b_conn, TorControlConnection::readcb, nullptr, TorControlConnection::eventcb, this);
# 151 : 0 : bufferevent_enable(b_conn, EV_READ|EV_WRITE);
# 152 : 0 : this->connected = _connected;
# 153 : 0 : this->disconnected = _disconnected;
# 154 : :
# 155 : : // Finally, connect to tor_control_center
# 156 [ # # ]: 0 : if (bufferevent_socket_connect(b_conn, (struct sockaddr*)&connect_to_addr, connect_to_addrlen) < 0) {
# 157 : 0 : LogPrintf("tor: Error connecting to address %s\n", tor_control_center);
# 158 : 0 : return false;
# 159 : 0 : }
# 160 : 0 : return true;
# 161 : 0 : }
# 162 : :
# 163 : : void TorControlConnection::Disconnect()
# 164 : 0 : {
# 165 [ # # ]: 0 : if (b_conn)
# 166 : 0 : bufferevent_free(b_conn);
# 167 : 0 : b_conn = nullptr;
# 168 : 0 : }
# 169 : :
# 170 : : bool TorControlConnection::Command(const std::string &cmd, const ReplyHandlerCB& reply_handler)
# 171 : 0 : {
# 172 [ # # ]: 0 : if (!b_conn)
# 173 : 0 : return false;
# 174 : 0 : struct evbuffer *buf = bufferevent_get_output(b_conn);
# 175 [ # # ]: 0 : if (!buf)
# 176 : 0 : return false;
# 177 : 0 : evbuffer_add(buf, cmd.data(), cmd.size());
# 178 : 0 : evbuffer_add(buf, "\r\n", 2);
# 179 : 0 : reply_handlers.push_back(reply_handler);
# 180 : 0 : return true;
# 181 : 0 : }
# 182 : :
# 183 : : /****** General parsing utilities ********/
# 184 : :
# 185 : : /* Split reply line in the form 'AUTH METHODS=...' into a type
# 186 : : * 'AUTH' and arguments 'METHODS=...'.
# 187 : : * Grammar is implicitly defined in https://spec.torproject.org/control-spec by
# 188 : : * the server reply formats for PROTOCOLINFO (S3.21) and AUTHCHALLENGE (S3.24).
# 189 : : */
# 190 : : std::pair<std::string,std::string> SplitTorReplyLine(const std::string &s)
# 191 : 20 : {
# 192 : 20 : size_t ptr=0;
# 193 : 20 : std::string type;
# 194 [ + + ][ + + ]: 164 : while (ptr < s.size() && s[ptr] != ' ') {
# 195 : 144 : type.push_back(s[ptr]);
# 196 : 144 : ++ptr;
# 197 : 144 : }
# 198 [ + + ]: 20 : if (ptr < s.size())
# 199 : 18 : ++ptr; // skip ' '
# 200 : 20 : return make_pair(type, s.substr(ptr));
# 201 : 20 : }
# 202 : :
# 203 : : /** Parse reply arguments in the form 'METHODS=COOKIE,SAFECOOKIE COOKIEFILE=".../control_auth_cookie"'.
# 204 : : * Returns a map of keys to values, or an empty map if there was an error.
# 205 : : * Grammar is implicitly defined in https://spec.torproject.org/control-spec by
# 206 : : * the server reply formats for PROTOCOLINFO (S3.21), AUTHCHALLENGE (S3.24),
# 207 : : * and ADD_ONION (S3.27). See also sections 2.1 and 2.3.
# 208 : : */
# 209 : : std::map<std::string,std::string> ParseTorReplyMapping(const std::string &s)
# 210 : 54 : {
# 211 : 54 : std::map<std::string,std::string> mapping;
# 212 : 54 : size_t ptr=0;
# 213 [ + + ]: 116 : while (ptr < s.size()) {
# 214 : 76 : std::string key, value;
# 215 [ + + ][ + + ]: 492 : while (ptr < s.size() && s[ptr] != '=' && s[ptr] != ' ') {
# [ + + ]
# 216 : 416 : key.push_back(s[ptr]);
# 217 : 416 : ++ptr;
# 218 : 416 : }
# 219 [ + + ]: 76 : if (ptr == s.size()) // unexpected end of line
# 220 : 2 : return std::map<std::string,std::string>();
# 221 [ + + ]: 74 : if (s[ptr] == ' ') // The remaining string is an OptArguments
# 222 : 10 : break;
# 223 : 64 : ++ptr; // skip '='
# 224 [ + - ][ + + ]: 64 : if (ptr < s.size() && s[ptr] == '"') { // Quoted string
# 225 : 36 : ++ptr; // skip opening '"'
# 226 : 36 : bool escape_next = false;
# 227 [ + + ][ + + ]: 448 : while (ptr < s.size() && (escape_next || s[ptr] != '"')) {
# [ + + ]
# 228 : : // Repeated backslashes must be interpreted as pairs
# 229 [ + + ][ + + ]: 412 : escape_next = (s[ptr] == '\\' && !escape_next);
# 230 : 412 : value.push_back(s[ptr]);
# 231 : 412 : ++ptr;
# 232 : 412 : }
# 233 [ + + ]: 36 : if (ptr == s.size()) // unexpected end of line
# 234 : 2 : return std::map<std::string,std::string>();
# 235 : 34 : ++ptr; // skip closing '"'
# 236 : : /**
# 237 : : * Unescape value. Per https://spec.torproject.org/control-spec section 2.1.1:
# 238 : : *
# 239 : : * For future-proofing, controller implementors MAY use the following
# 240 : : * rules to be compatible with buggy Tor implementations and with
# 241 : : * future ones that implement the spec as intended:
# 242 : : *
# 243 : : * Read \n \t \r and \0 ... \377 as C escapes.
# 244 : : * Treat a backslash followed by any other character as that character.
# 245 : : */
# 246 : 34 : std::string escaped_value;
# 247 [ + + ]: 366 : for (size_t i = 0; i < value.size(); ++i) {
# 248 [ + + ]: 332 : if (value[i] == '\\') {
# 249 : : // This will always be valid, because if the QuotedString
# 250 : : // ended in an odd number of backslashes, then the parser
# 251 : : // would already have returned above, due to a missing
# 252 : : // terminating double-quote.
# 253 : 46 : ++i;
# 254 [ + + ]: 46 : if (value[i] == 'n') {
# 255 : 2 : escaped_value.push_back('\n');
# 256 [ + + ]: 44 : } else if (value[i] == 't') {
# 257 : 2 : escaped_value.push_back('\t');
# 258 [ + + ]: 42 : } else if (value[i] == 'r') {
# 259 : 2 : escaped_value.push_back('\r');
# 260 [ + + ][ + + ]: 40 : } else if ('0' <= value[i] && value[i] <= '7') {
# 261 : 22 : size_t j;
# 262 : : // Octal escape sequences have a limit of three octal digits,
# 263 : : // but terminate at the first character that is not a valid
# 264 : : // octal digit if encountered sooner.
# 265 [ + + ][ + + ]: 42 : for (j = 1; j < 3 && (i+j) < value.size() && '0' <= value[i+j] && value[i+j] <= '7'; ++j) {}
# [ + - ][ + + ]
# 266 : : // Tor restricts first digit to 0-3 for three-digit octals.
# 267 : : // A leading digit of 4-7 would therefore be interpreted as
# 268 : : // a two-digit octal.
# 269 [ + + ][ + + ]: 22 : if (j == 3 && value[i] > '3') {
# 270 : 2 : j--;
# 271 : 2 : }
# 272 : 22 : escaped_value.push_back(strtol(value.substr(i, j).c_str(), nullptr, 8));
# 273 : : // Account for automatic incrementing at loop end
# 274 : 22 : i += j - 1;
# 275 : 22 : } else {
# 276 : 18 : escaped_value.push_back(value[i]);
# 277 : 18 : }
# 278 : 286 : } else {
# 279 : 286 : escaped_value.push_back(value[i]);
# 280 : 286 : }
# 281 : 332 : }
# 282 : 34 : value = escaped_value;
# 283 : 34 : } else { // Unquoted value. Note that values can contain '=' at will, just no spaces
# 284 [ + + ][ + + ]: 264 : while (ptr < s.size() && s[ptr] != ' ') {
# 285 : 236 : value.push_back(s[ptr]);
# 286 : 236 : ++ptr;
# 287 : 236 : }
# 288 : 28 : }
# 289 [ + + ][ + - ]: 64 : if (ptr < s.size() && s[ptr] == ' ')
# 290 : 22 : ++ptr; // skip ' ' after key=value
# 291 : 62 : mapping[key] = value;
# 292 : 62 : }
# 293 : 54 : return mapping;
# 294 : 54 : }
# 295 : :
# 296 : : TorController::TorController(struct event_base* _base, const std::string& tor_control_center, const CService& target):
# 297 : : base(_base),
# 298 : : m_tor_control_center(tor_control_center), conn(base), reconnect(true), reconnect_ev(0),
# 299 : : reconnect_timeout(RECONNECT_TIMEOUT_START),
# 300 : : m_target(target)
# 301 : 0 : {
# 302 : 0 : reconnect_ev = event_new(base, -1, 0, reconnect_cb, this);
# 303 [ # # ]: 0 : if (!reconnect_ev)
# 304 : 0 : LogPrintf("tor: Failed to create event for reconnection: out of memory?\n");
# 305 : : // Start connection attempts immediately
# 306 [ # # ]: 0 : if (!conn.Connect(m_tor_control_center, std::bind(&TorController::connected_cb, this, std::placeholders::_1),
# 307 : 0 : std::bind(&TorController::disconnected_cb, this, std::placeholders::_1) )) {
# 308 : 0 : LogPrintf("tor: Initiating connection to Tor control port %s failed\n", m_tor_control_center);
# 309 : 0 : }
# 310 : : // Read service private key if cached
# 311 : 0 : std::pair<bool,std::string> pkf = ReadBinaryFile(GetPrivateKeyFile());
# 312 [ # # ]: 0 : if (pkf.first) {
# 313 [ # # ]: 0 : LogPrint(BCLog::TOR, "tor: Reading cached private key from %s\n", GetPrivateKeyFile().string());
# 314 : 0 : private_key = pkf.second;
# 315 : 0 : }
# 316 : 0 : }
# 317 : :
# 318 : : TorController::~TorController()
# 319 : 0 : {
# 320 [ # # ]: 0 : if (reconnect_ev) {
# 321 : 0 : event_free(reconnect_ev);
# 322 : 0 : reconnect_ev = nullptr;
# 323 : 0 : }
# 324 [ # # ]: 0 : if (service.IsValid()) {
# 325 : 0 : RemoveLocal(service);
# 326 : 0 : }
# 327 : 0 : }
# 328 : :
# 329 : : void TorController::add_onion_cb(TorControlConnection& _conn, const TorControlReply& reply)
# 330 : 0 : {
# 331 [ # # ]: 0 : if (reply.code == 250) {
# 332 [ # # ]: 0 : LogPrint(BCLog::TOR, "tor: ADD_ONION successful\n");
# 333 [ # # ]: 0 : for (const std::string &s : reply.lines) {
# 334 : 0 : std::map<std::string,std::string> m = ParseTorReplyMapping(s);
# 335 : 0 : std::map<std::string,std::string>::iterator i;
# 336 [ # # ]: 0 : if ((i = m.find("ServiceID")) != m.end())
# 337 : 0 : service_id = i->second;
# 338 [ # # ]: 0 : if ((i = m.find("PrivateKey")) != m.end())
# 339 : 0 : private_key = i->second;
# 340 : 0 : }
# 341 [ # # ]: 0 : if (service_id.empty()) {
# 342 : 0 : LogPrintf("tor: Error parsing ADD_ONION parameters:\n");
# 343 [ # # ]: 0 : for (const std::string &s : reply.lines) {
# 344 : 0 : LogPrintf(" %s\n", SanitizeString(s));
# 345 : 0 : }
# 346 : 0 : return;
# 347 : 0 : }
# 348 : 0 : service = LookupNumeric(std::string(service_id+".onion"), Params().GetDefaultPort());
# 349 : 0 : LogPrintf("tor: Got service ID %s, advertising service %s\n", service_id, service.ToString());
# 350 [ # # ]: 0 : if (WriteBinaryFile(GetPrivateKeyFile(), private_key)) {
# 351 [ # # ]: 0 : LogPrint(BCLog::TOR, "tor: Cached service private key to %s\n", GetPrivateKeyFile().string());
# 352 : 0 : } else {
# 353 : 0 : LogPrintf("tor: Error writing service private key to %s\n", GetPrivateKeyFile().string());
# 354 : 0 : }
# 355 : 0 : AddLocal(service, LOCAL_MANUAL);
# 356 : : // ... onion requested - keep connection open
# 357 [ # # ]: 0 : } else if (reply.code == 510) { // 510 Unrecognized command
# 358 : 0 : LogPrintf("tor: Add onion failed with unrecognized command (You probably need to upgrade Tor)\n");
# 359 : 0 : } else {
# 360 : 0 : LogPrintf("tor: Add onion failed; error code %d\n", reply.code);
# 361 : 0 : }
# 362 : 0 : }
# 363 : :
# 364 : : void TorController::auth_cb(TorControlConnection& _conn, const TorControlReply& reply)
# 365 : 0 : {
# 366 [ # # ]: 0 : if (reply.code == 250) {
# 367 [ # # ]: 0 : LogPrint(BCLog::TOR, "tor: Authentication successful\n");
# 368 : :
# 369 : : // Now that we know Tor is running setup the proxy for onion addresses
# 370 : : // if -onion isn't set to something else.
# 371 [ # # ]: 0 : if (gArgs.GetArg("-onion", "") == "") {
# 372 : 0 : CService resolved(LookupNumeric("127.0.0.1", 9050));
# 373 : 0 : proxyType addrOnion = proxyType(resolved, true);
# 374 : 0 : SetProxy(NET_ONION, addrOnion);
# 375 : 0 : SetReachable(NET_ONION, true);
# 376 : 0 : }
# 377 : :
# 378 : : // Finally - now create the service
# 379 [ # # ]: 0 : if (private_key.empty()) { // No private key, generate one
# 380 : 0 : private_key = "NEW:ED25519-V3"; // Explicitly request key type - see issue #9214
# 381 : 0 : }
# 382 : : // Request onion service, redirect port.
# 383 : : // Note that the 'virtual' port is always the default port to avoid decloaking nodes using other ports.
# 384 : 0 : _conn.Command(strprintf("ADD_ONION %s Port=%i,%s", private_key, Params().GetDefaultPort(), m_target.ToStringIPPort()),
# 385 : 0 : std::bind(&TorController::add_onion_cb, this, std::placeholders::_1, std::placeholders::_2));
# 386 : 0 : } else {
# 387 : 0 : LogPrintf("tor: Authentication failed\n");
# 388 : 0 : }
# 389 : 0 : }
# 390 : :
# 391 : : /** Compute Tor SAFECOOKIE response.
# 392 : : *
# 393 : : * ServerHash is computed as:
# 394 : : * HMAC-SHA256("Tor safe cookie authentication server-to-controller hash",
# 395 : : * CookieString | ClientNonce | ServerNonce)
# 396 : : * (with the HMAC key as its first argument)
# 397 : : *
# 398 : : * After a controller sends a successful AUTHCHALLENGE command, the
# 399 : : * next command sent on the connection must be an AUTHENTICATE command,
# 400 : : * and the only authentication string which that AUTHENTICATE command
# 401 : : * will accept is:
# 402 : : *
# 403 : : * HMAC-SHA256("Tor safe cookie authentication controller-to-server hash",
# 404 : : * CookieString | ClientNonce | ServerNonce)
# 405 : : *
# 406 : : */
# 407 : : static std::vector<uint8_t> ComputeResponse(const std::string &key, const std::vector<uint8_t> &cookie, const std::vector<uint8_t> &clientNonce, const std::vector<uint8_t> &serverNonce)
# 408 : 0 : {
# 409 : 0 : CHMAC_SHA256 computeHash((const uint8_t*)key.data(), key.size());
# 410 : 0 : std::vector<uint8_t> computedHash(CHMAC_SHA256::OUTPUT_SIZE, 0);
# 411 : 0 : computeHash.Write(cookie.data(), cookie.size());
# 412 : 0 : computeHash.Write(clientNonce.data(), clientNonce.size());
# 413 : 0 : computeHash.Write(serverNonce.data(), serverNonce.size());
# 414 : 0 : computeHash.Finalize(computedHash.data());
# 415 : 0 : return computedHash;
# 416 : 0 : }
# 417 : :
# 418 : : void TorController::authchallenge_cb(TorControlConnection& _conn, const TorControlReply& reply)
# 419 : 0 : {
# 420 [ # # ]: 0 : if (reply.code == 250) {
# 421 [ # # ]: 0 : LogPrint(BCLog::TOR, "tor: SAFECOOKIE authentication challenge successful\n");
# 422 : 0 : std::pair<std::string,std::string> l = SplitTorReplyLine(reply.lines[0]);
# 423 [ # # ]: 0 : if (l.first == "AUTHCHALLENGE") {
# 424 : 0 : std::map<std::string,std::string> m = ParseTorReplyMapping(l.second);
# 425 [ # # ]: 0 : if (m.empty()) {
# 426 : 0 : LogPrintf("tor: Error parsing AUTHCHALLENGE parameters: %s\n", SanitizeString(l.second));
# 427 : 0 : return;
# 428 : 0 : }
# 429 : 0 : std::vector<uint8_t> serverHash = ParseHex(m["SERVERHASH"]);
# 430 : 0 : std::vector<uint8_t> serverNonce = ParseHex(m["SERVERNONCE"]);
# 431 [ # # ]: 0 : LogPrint(BCLog::TOR, "tor: AUTHCHALLENGE ServerHash %s ServerNonce %s\n", HexStr(serverHash), HexStr(serverNonce));
# 432 [ # # ]: 0 : if (serverNonce.size() != 32) {
# 433 : 0 : LogPrintf("tor: ServerNonce is not 32 bytes, as required by spec\n");
# 434 : 0 : return;
# 435 : 0 : }
# 436 : :
# 437 : 0 : std::vector<uint8_t> computedServerHash = ComputeResponse(TOR_SAFE_SERVERKEY, cookie, clientNonce, serverNonce);
# 438 [ # # ]: 0 : if (computedServerHash != serverHash) {
# 439 : 0 : LogPrintf("tor: ServerHash %s does not match expected ServerHash %s\n", HexStr(serverHash), HexStr(computedServerHash));
# 440 : 0 : return;
# 441 : 0 : }
# 442 : :
# 443 : 0 : std::vector<uint8_t> computedClientHash = ComputeResponse(TOR_SAFE_CLIENTKEY, cookie, clientNonce, serverNonce);
# 444 : 0 : _conn.Command("AUTHENTICATE " + HexStr(computedClientHash), std::bind(&TorController::auth_cb, this, std::placeholders::_1, std::placeholders::_2));
# 445 : 0 : } else {
# 446 : 0 : LogPrintf("tor: Invalid reply to AUTHCHALLENGE\n");
# 447 : 0 : }
# 448 : 0 : } else {
# 449 : 0 : LogPrintf("tor: SAFECOOKIE authentication challenge failed\n");
# 450 : 0 : }
# 451 : 0 : }
# 452 : :
# 453 : : void TorController::protocolinfo_cb(TorControlConnection& _conn, const TorControlReply& reply)
# 454 : 0 : {
# 455 [ # # ]: 0 : if (reply.code == 250) {
# 456 : 0 : std::set<std::string> methods;
# 457 : 0 : std::string cookiefile;
# 458 : : /*
# 459 : : * 250-AUTH METHODS=COOKIE,SAFECOOKIE COOKIEFILE="/home/x/.tor/control_auth_cookie"
# 460 : : * 250-AUTH METHODS=NULL
# 461 : : * 250-AUTH METHODS=HASHEDPASSWORD
# 462 : : */
# 463 [ # # ]: 0 : for (const std::string &s : reply.lines) {
# 464 : 0 : std::pair<std::string,std::string> l = SplitTorReplyLine(s);
# 465 [ # # ]: 0 : if (l.first == "AUTH") {
# 466 : 0 : std::map<std::string,std::string> m = ParseTorReplyMapping(l.second);
# 467 : 0 : std::map<std::string,std::string>::iterator i;
# 468 [ # # ]: 0 : if ((i = m.find("METHODS")) != m.end())
# 469 : 0 : boost::split(methods, i->second, boost::is_any_of(","));
# 470 [ # # ]: 0 : if ((i = m.find("COOKIEFILE")) != m.end())
# 471 : 0 : cookiefile = i->second;
# 472 [ # # ]: 0 : } else if (l.first == "VERSION") {
# 473 : 0 : std::map<std::string,std::string> m = ParseTorReplyMapping(l.second);
# 474 : 0 : std::map<std::string,std::string>::iterator i;
# 475 [ # # ]: 0 : if ((i = m.find("Tor")) != m.end()) {
# 476 [ # # ]: 0 : LogPrint(BCLog::TOR, "tor: Connected to Tor version %s\n", i->second);
# 477 : 0 : }
# 478 : 0 : }
# 479 : 0 : }
# 480 [ # # ]: 0 : for (const std::string &s : methods) {
# 481 [ # # ]: 0 : LogPrint(BCLog::TOR, "tor: Supported authentication method: %s\n", s);
# 482 : 0 : }
# 483 : : // Prefer NULL, otherwise SAFECOOKIE. If a password is provided, use HASHEDPASSWORD
# 484 : : /* Authentication:
# 485 : : * cookie: hex-encoded ~/.tor/control_auth_cookie
# 486 : : * password: "password"
# 487 : : */
# 488 : 0 : std::string torpassword = gArgs.GetArg("-torpassword", "");
# 489 [ # # ]: 0 : if (!torpassword.empty()) {
# 490 [ # # ]: 0 : if (methods.count("HASHEDPASSWORD")) {
# 491 [ # # ]: 0 : LogPrint(BCLog::TOR, "tor: Using HASHEDPASSWORD authentication\n");
# 492 : 0 : boost::replace_all(torpassword, "\"", "\\\"");
# 493 : 0 : _conn.Command("AUTHENTICATE \"" + torpassword + "\"", std::bind(&TorController::auth_cb, this, std::placeholders::_1, std::placeholders::_2));
# 494 : 0 : } else {
# 495 : 0 : LogPrintf("tor: Password provided with -torpassword, but HASHEDPASSWORD authentication is not available\n");
# 496 : 0 : }
# 497 [ # # ]: 0 : } else if (methods.count("NULL")) {
# 498 [ # # ]: 0 : LogPrint(BCLog::TOR, "tor: Using NULL authentication\n");
# 499 : 0 : _conn.Command("AUTHENTICATE", std::bind(&TorController::auth_cb, this, std::placeholders::_1, std::placeholders::_2));
# 500 [ # # ]: 0 : } else if (methods.count("SAFECOOKIE")) {
# 501 : : // Cookie: hexdump -e '32/1 "%02x""\n"' ~/.tor/control_auth_cookie
# 502 [ # # ]: 0 : LogPrint(BCLog::TOR, "tor: Using SAFECOOKIE authentication, reading cookie authentication from %s\n", cookiefile);
# 503 : 0 : std::pair<bool,std::string> status_cookie = ReadBinaryFile(cookiefile, TOR_COOKIE_SIZE);
# 504 [ # # ][ # # ]: 0 : if (status_cookie.first && status_cookie.second.size() == TOR_COOKIE_SIZE) {
# 505 : : // _conn.Command("AUTHENTICATE " + HexStr(status_cookie.second), std::bind(&TorController::auth_cb, this, std::placeholders::_1, std::placeholders::_2));
# 506 : 0 : cookie = std::vector<uint8_t>(status_cookie.second.begin(), status_cookie.second.end());
# 507 : 0 : clientNonce = std::vector<uint8_t>(TOR_NONCE_SIZE, 0);
# 508 : 0 : GetRandBytes(clientNonce.data(), TOR_NONCE_SIZE);
# 509 : 0 : _conn.Command("AUTHCHALLENGE SAFECOOKIE " + HexStr(clientNonce), std::bind(&TorController::authchallenge_cb, this, std::placeholders::_1, std::placeholders::_2));
# 510 : 0 : } else {
# 511 [ # # ]: 0 : if (status_cookie.first) {
# 512 : 0 : LogPrintf("tor: Authentication cookie %s is not exactly %i bytes, as is required by the spec\n", cookiefile, TOR_COOKIE_SIZE);
# 513 : 0 : } else {
# 514 : 0 : LogPrintf("tor: Authentication cookie %s could not be opened (check permissions)\n", cookiefile);
# 515 : 0 : }
# 516 : 0 : }
# 517 [ # # ]: 0 : } else if (methods.count("HASHEDPASSWORD")) {
# 518 : 0 : LogPrintf("tor: The only supported authentication mechanism left is password, but no password provided with -torpassword\n");
# 519 : 0 : } else {
# 520 : 0 : LogPrintf("tor: No supported authentication method\n");
# 521 : 0 : }
# 522 : 0 : } else {
# 523 : 0 : LogPrintf("tor: Requesting protocol info failed\n");
# 524 : 0 : }
# 525 : 0 : }
# 526 : :
# 527 : : void TorController::connected_cb(TorControlConnection& _conn)
# 528 : 0 : {
# 529 : 0 : reconnect_timeout = RECONNECT_TIMEOUT_START;
# 530 : : // First send a PROTOCOLINFO command to figure out what authentication is expected
# 531 [ # # ]: 0 : if (!_conn.Command("PROTOCOLINFO 1", std::bind(&TorController::protocolinfo_cb, this, std::placeholders::_1, std::placeholders::_2)))
# 532 : 0 : LogPrintf("tor: Error sending initial protocolinfo command\n");
# 533 : 0 : }
# 534 : :
# 535 : : void TorController::disconnected_cb(TorControlConnection& _conn)
# 536 : 0 : {
# 537 : : // Stop advertising service when disconnected
# 538 [ # # ]: 0 : if (service.IsValid())
# 539 : 0 : RemoveLocal(service);
# 540 : 0 : service = CService();
# 541 [ # # ]: 0 : if (!reconnect)
# 542 : 0 : return;
# 543 : :
# 544 [ # # ]: 0 : LogPrint(BCLog::TOR, "tor: Not connected to Tor control port %s, trying to reconnect\n", m_tor_control_center);
# 545 : :
# 546 : : // Single-shot timer for reconnect. Use exponential backoff.
# 547 : 0 : struct timeval time = MillisToTimeval(int64_t(reconnect_timeout * 1000.0));
# 548 [ # # ]: 0 : if (reconnect_ev)
# 549 : 0 : event_add(reconnect_ev, &time);
# 550 : 0 : reconnect_timeout *= RECONNECT_TIMEOUT_EXP;
# 551 : 0 : }
# 552 : :
# 553 : : void TorController::Reconnect()
# 554 : 0 : {
# 555 : : /* Try to reconnect and reestablish if we get booted - for example, Tor
# 556 : : * may be restarting.
# 557 : : */
# 558 [ # # ]: 0 : if (!conn.Connect(m_tor_control_center, std::bind(&TorController::connected_cb, this, std::placeholders::_1),
# 559 : 0 : std::bind(&TorController::disconnected_cb, this, std::placeholders::_1) )) {
# 560 : 0 : LogPrintf("tor: Re-initiating connection to Tor control port %s failed\n", m_tor_control_center);
# 561 : 0 : }
# 562 : 0 : }
# 563 : :
# 564 : : fs::path TorController::GetPrivateKeyFile()
# 565 : 0 : {
# 566 : 0 : return gArgs.GetDataDirNet() / "onion_v3_private_key";
# 567 : 0 : }
# 568 : :
# 569 : : void TorController::reconnect_cb(evutil_socket_t fd, short what, void *arg)
# 570 : 0 : {
# 571 : 0 : TorController *self = static_cast<TorController*>(arg);
# 572 : 0 : self->Reconnect();
# 573 : 0 : }
# 574 : :
# 575 : : /****** Thread ********/
# 576 : : static struct event_base *gBase;
# 577 : : static std::thread torControlThread;
# 578 : :
# 579 : : static void TorControlThread(CService onion_service_target)
# 580 : 0 : {
# 581 : 0 : TorController ctrl(gBase, gArgs.GetArg("-torcontrol", DEFAULT_TOR_CONTROL), onion_service_target);
# 582 : :
# 583 : 0 : event_base_dispatch(gBase);
# 584 : 0 : }
# 585 : :
# 586 : : void StartTorControl(CService onion_service_target)
# 587 : 0 : {
# 588 : 0 : assert(!gBase);
# 589 : : #ifdef WIN32
# 590 : : evthread_use_windows_threads();
# 591 : : #else
# 592 : 0 : evthread_use_pthreads();
# 593 : 0 : #endif
# 594 : 0 : gBase = event_base_new();
# 595 [ # # ]: 0 : if (!gBase) {
# 596 : 0 : LogPrintf("tor: Unable to create event_base\n");
# 597 : 0 : return;
# 598 : 0 : }
# 599 : :
# 600 : 0 : torControlThread = std::thread(&util::TraceThread, "torcontrol", [onion_service_target] {
# 601 : 0 : TorControlThread(onion_service_target);
# 602 : 0 : });
# 603 : 0 : }
# 604 : :
# 605 : : void InterruptTorControl()
# 606 : 663 : {
# 607 [ - + ]: 663 : if (gBase) {
# 608 : 0 : LogPrintf("tor: Thread interrupt\n");
# 609 : 0 : event_base_once(gBase, -1, EV_TIMEOUT, [](evutil_socket_t, short, void*) {
# 610 : 0 : event_base_loopbreak(gBase);
# 611 : 0 : }, nullptr, nullptr);
# 612 : 0 : }
# 613 : 663 : }
# 614 : :
# 615 : : void StopTorControl()
# 616 : 663 : {
# 617 [ - + ]: 663 : if (gBase) {
# 618 : 0 : torControlThread.join();
# 619 : 0 : event_base_free(gBase);
# 620 : 0 : gBase = nullptr;
# 621 : 0 : }
# 622 : 663 : }
# 623 : :
# 624 : : CService DefaultOnionServiceTarget()
# 625 : 621 : {
# 626 : 621 : struct in_addr onion_service_target;
# 627 : 621 : onion_service_target.s_addr = htonl(INADDR_LOOPBACK);
# 628 : 621 : return {onion_service_target, BaseParams().OnionServiceTargetPort()};
# 629 : 621 : }
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