Added socks proxy (tor/i2pd/kovri) support to wallet

ANONYMITY_NETWORKS.md

@@ -19,6 +19,11 @@ network. The transaction will not be broadcast unless an anonymity connection
 is made or until `monerod` is shutdown and restarted with only public
 connections enabled.
 
+Anonymity networks can also be used with `monero-wallet-cli` and
+`monero-wallet-rpc` - the wallets will connect to a daemon through a proxy. The
+daemon must provide a hidden service for the RPC itself, which is separate from
+the hidden service for P2P connections.
+
 
 ## P2P Commands
 
@@ -74,6 +79,35 @@ forwarded to `monerod` localhost port 30000.
 These addresses will be shared with outgoing peers, over the same network type,
 otherwise the peer will not be notified of the peer address by the proxy.
 
+### Wallet RPC
+
+An anonymity network can be configured to forward incoming connections to a
+`monerod` RPC port - which is independent from the configuration for incoming
+P2P anonymity connections. The anonymity network (Tor/i2p) is
+[configured in the same manner](#configuration), except the localhost port
+must be the RPC port (typically 18081 for mainnet) instead of the p2p port:
+
+> HiddenServiceDir /var/lib/tor/data/monero
+> HiddenServicePort 18081 127.0.0.1:18081
+
+Then the wallet will be configured to use a Tor/i2p address:
+> `--proxy 127.0.0.1:9050`
+> `--daemon-address rveahdfho7wo4b2m.onion`
+
+The proxy must match the address type - a Tor proxy will not work properly with
+i2p addresses, etc.
+
+i2p and onion addresses provide the information necessary to authenticate and
+encrypt the connection from end-to-end. If desired, SSL can also be applied to
+the connection with `--daemon-address https://rveahdfho7wo4b2m.onion` which
+requires a server certificate that is signed by a "root" certificate on the
+machine running the wallet. Alternatively, `--daemon-cert-file` can be used to
+specify a certificate to authenticate the server.
+
+Proxies can also be used to connect to "clearnet" (ipv4 addresses or ICANN
+domains), but `--daemon-cert-file` _must_ be used for authentication and
+encryption.
+
 ### Network Types
 
 #### Tor & I2P

contrib/epee/include/net/abstract_tcp_server2.inl

@@ -58,11 +58,6 @@
 #define DEFAULT_TIMEOUT_MS_REMOTE 300000 // 5 minutes
 #define TIMEOUT_EXTRA_MS_PER_BYTE 0.2
 
-#if BOOST_VERSION >= 107000
-#define GET_IO_SERVICE(s) ((boost::asio::io_context&)(s).get_executor().context())
-#else
-#define GET_IO_SERVICE(s) ((s).get_io_service())
-#endif
 
 PRAGMA_WARNING_PUSH
 namespace epee

contrib/epee/include/net/http_client.h

@@ -327,10 +327,17 @@ namespace net_utils
 				m_net_client.set_ssl(m_ssl_support, m_ssl_private_key_and_certificate_path, m_ssl_allowed_certificates, m_ssl_allowed_fingerprints, m_ssl_allow_any_cert);
 			}
 
+			template<typename F>
+			void set_connector(F connector)
+			{
+				CRITICAL_REGION_LOCAL(m_lock);
+				m_net_client.set_connector(std::move(connector));
+			}
+
       bool connect(std::chrono::milliseconds timeout)
       {
         CRITICAL_REGION_LOCAL(m_lock);
-        return m_net_client.connect(m_host_buff, m_port, timeout, "0.0.0.0");
+        return m_net_client.connect(m_host_buff, m_port, timeout);
       }
 			//---------------------------------------------------------------------------
 			bool disconnect()

contrib/epee/include/net/net_helper.h

@@ -33,12 +33,17 @@
 //#include <Ws2tcpip.h>
 #include <string>
 #include <boost/version.hpp>
-#include <boost/asio.hpp>
+#include <boost/asio/io_service.hpp>
+#include <boost/asio/ip/tcp.hpp>
+#include <boost/asio/read.hpp>
 #include <boost/asio/ssl.hpp>
 #include <boost/asio/steady_timer.hpp>
+#include <boost/thread/future.hpp>
 #include <boost/lambda/bind.hpp>
 #include <boost/lambda/lambda.hpp>
 #include <boost/interprocess/detail/atomic.hpp>
+#include <boost/system/error_code.hpp>
+#include <functional>
 #include "net/net_utils_base.h"
 #include "net/net_ssl.h"
 #include "misc_language.h"
@@ -55,6 +60,12 @@ namespace epee
 {
 namespace net_utils
 {
+	struct direct_connect
+	{
+		boost::unique_future<boost::asio::ip::tcp::socket>
+			operator()(const std::string& addr, const std::string& port, boost::asio::steady_timer&) const;
+	};
+
 
   class blocked_mode_client
 	{
@@ -85,31 +96,38 @@ namespace net_utils
 						ref_bytes_transferred = bytes_transferred;
 					}
 				};
-		
+
 	public:
 		inline
-			blocked_mode_client():m_initialized(false), 
+			blocked_mode_client() :
-                            m_connected(false), 
+				m_io_service(),
-                            m_deadline(m_io_service), 
+				m_ctx({boost::asio::ssl::context(boost::asio::ssl::context::tlsv12), {}}),
-                            m_shutdowned(0),
+				m_connector(direct_connect{}),
-                            m_ssl_support(epee::net_utils::ssl_support_t::e_ssl_support_autodetect),
+				m_ssl_socket(new boost::asio::ssl::stream<boost::asio::ip::tcp::socket>(m_io_service, m_ctx.context)),
-                            m_ctx({boost::asio::ssl::context(boost::asio::ssl::context::tlsv12), {}}),
+				m_ssl_support(epee::net_utils::ssl_support_t::e_ssl_support_autodetect),
-                            m_ssl_socket(new boost::asio::ssl::stream<boost::asio::ip::tcp::socket>(m_io_service,m_ctx.context))
+				m_initialized(true),
+				m_connected(false),
+				m_deadline(m_io_service),
+				m_shutdowned(0)
 		{
-			
-			
-			m_initialized = true;
-
-
-			// No deadline is required until the first socket operation is started. We
-			// set the deadline to positive infinity so that the actor takes no action
-			// until a specific deadline is set.
-			m_deadline.expires_at(std::chrono::steady_clock::time_point::max());
-
-			// Start the persistent actor that checks for deadline expiry.
-			check_deadline();
-
 		}
+
+		/*! The first/second parameters are host/port respectively. The third
+		    parameter is for setting the timeout callback - the timer is
+		    already set by the caller, the callee only needs to set the
+		    behavior.
+
+		    Additional asynchronous operations should be queued using the
+		    `io_service` from the timer. The implementation should assume
+		    multi-threaded I/O processing.
+
+		    If the callee cannot start an asynchronous operation, an exception
+		    should be thrown to signal an immediate failure.
+
+		    The return value is a future to a connected socket. Asynchronous
+		    failures should use the `set_exception` method. */
+		using connect_func = boost::unique_future<boost::asio::ip::tcp::socket>(const std::string&, const std::string&, boost::asio::steady_timer&);
+
 		inline
 			~blocked_mode_client()
 		{
@@ -128,33 +146,28 @@ namespace net_utils
 		}
 
     inline
-      bool connect(const std::string& addr, int port, std::chrono::milliseconds timeout, const std::string& bind_ip = "0.0.0.0")
+      bool connect(const std::string& addr, int port, std::chrono::milliseconds timeout)
     {
-      return connect(addr, std::to_string(port), timeout, bind_ip);
+      return connect(addr, std::to_string(port), timeout);
     }
 
     inline
-			try_connect_result_t try_connect(const std::string& addr, const std::string& port, const boost::asio::ip::tcp::endpoint &remote_endpoint, std::chrono::milliseconds timeout, const std::string& bind_ip, epee::net_utils::ssl_support_t ssl_support)
+			try_connect_result_t try_connect(const std::string& addr, const std::string& port, std::chrono::milliseconds timeout, epee::net_utils::ssl_support_t ssl_support)
 		{
-				m_ssl_socket->next_layer().open(remote_endpoint.protocol());
-				if(bind_ip != "0.0.0.0" && bind_ip != "0" && bind_ip != "" )
-				{
-					boost::asio::ip::tcp::endpoint local_endpoint(boost::asio::ip::address::from_string(addr.c_str()), 0);
-					m_ssl_socket->next_layer().bind(local_endpoint);
-				}
-
-				
 				m_deadline.expires_from_now(timeout);
+				boost::unique_future<boost::asio::ip::tcp::socket> connection = m_connector(addr, port, m_deadline);
+				for (;;)
+				{
+					m_io_service.reset();
+					m_io_service.run_one();
 
-				boost::system::error_code ec = boost::asio::error::would_block;
+					if (connection.is_ready())
-
+						break;
-				m_ssl_socket->next_layer().async_connect(remote_endpoint, boost::lambda::var(ec) = boost::lambda::_1);
-				while (ec == boost::asio::error::would_block)
-				{	
-					m_io_service.run_one(); 
 				}
-				
+
-				if (!ec && m_ssl_socket->next_layer().is_open())
+				m_ssl_socket->next_layer() = connection.get();
+				m_deadline.cancel();
+				if (m_ssl_socket->next_layer().is_open())
 				{
 					m_connected = true;
 					m_deadline.expires_at(std::chrono::steady_clock::time_point::max());
@@ -183,14 +196,14 @@ namespace net_utils
 					return CONNECT_SUCCESS;
 				}else
 				{
-					MWARNING("Some problems at connect, message: " << ec.message());
+					MWARNING("Some problems at connect, expected open socket");
 					return CONNECT_FAILURE;
 				}
 
 		}
 
     inline
-			bool connect(const std::string& addr, const std::string& port, std::chrono::milliseconds timeout, const std::string& bind_ip = "0.0.0.0")
+			bool connect(const std::string& addr, const std::string& port, std::chrono::milliseconds timeout)
 		{
 			m_connected = false;
 			try
@@ -205,25 +218,7 @@ namespace net_utils
 
 				// Get a list of endpoints corresponding to the server name.
 
-				//////////////////////////////////////////////////////////////////////////
+				try_connect_result_t try_connect_result = try_connect(addr, port, timeout, m_ssl_support);
-
-				boost::asio::ip::tcp::resolver resolver(m_io_service);
-				boost::asio::ip::tcp::resolver::query query(boost::asio::ip::tcp::v4(), addr, port, boost::asio::ip::tcp::resolver::query::canonical_name);
-				boost::asio::ip::tcp::resolver::iterator iterator = resolver.resolve(query);
-				boost::asio::ip::tcp::resolver::iterator end;
-				if(iterator == end)
-				{
-					LOG_ERROR("Failed to resolve " << addr);
-					return false;
-				}
-
-				//////////////////////////////////////////////////////////////////////////
-
-
-				//boost::asio::ip::tcp::endpoint remote_endpoint(boost::asio::ip::address::from_string(addr.c_str()), port);
-				boost::asio::ip::tcp::endpoint remote_endpoint(*iterator);
-
-				try_connect_result_t try_connect_result = try_connect(addr, port, remote_endpoint, timeout, bind_ip, m_ssl_support);
 				if (try_connect_result == CONNECT_FAILURE)
 					return false;
 				if (m_ssl_support == epee::net_utils::ssl_support_t::e_ssl_support_autodetect)
@@ -233,7 +228,7 @@ namespace net_utils
 					{
 						MERROR("SSL handshake failed on an autodetect connection, reconnecting without SSL");
 						m_ssl_support = epee::net_utils::ssl_support_t::e_ssl_support_disabled;
-						if (try_connect(addr, port, remote_endpoint, timeout, bind_ip, m_ssl_support) != CONNECT_SUCCESS)
+						if (try_connect(addr, port, timeout, m_ssl_support) != CONNECT_SUCCESS)
 							return false;
 					}
 				}
@@ -251,6 +246,11 @@ namespace net_utils
 
 			return true;
 		}
+		//! Change the connection routine (proxy, etc.)
+		void set_connector(std::function<connect_func> connector)
+		{
+			m_connector = std::move(connector);
+		}
 
 		inline 
 		bool disconnect()
@@ -265,7 +265,6 @@ namespace net_utils
 					m_ssl_socket->next_layer().shutdown(boost::asio::ip::tcp::socket::shutdown_both);
 				}
 			}
-			
 			catch(const boost::system::system_error& /*er*/)
 			{
 				//LOG_ERROR("Some problems at disconnect, message: " << er.what());
@@ -304,6 +303,7 @@ namespace net_utils
 				// Block until the asynchronous operation has completed.
 				while (ec == boost::asio::error::would_block)
 				{
+					m_io_service.reset();
 					m_io_service.run_one(); 
 				}
 
@@ -433,6 +433,7 @@ namespace net_utils
 				// Block until the asynchronous operation has completed.
 				while (ec == boost::asio::error::would_block && !boost::interprocess::ipcdetail::atomic_read32(&m_shutdowned))
 				{
+					m_io_service.reset();
 					m_io_service.run_one(); 
 				}
 
@@ -573,10 +574,6 @@ namespace net_utils
 			return true;
 		}
 		
-		void set_connected(bool connected)
-		{
-			m_connected = connected;
-		}
 		boost::asio::io_service& get_io_service()
 		{
 			return m_io_service;
@@ -619,6 +616,7 @@ namespace net_utils
 			m_ssl_socket->async_shutdown(boost::lambda::var(ec) = boost::lambda::_1);
 			while (ec == boost::asio::error::would_block)
 			{
+				m_io_service.reset();
 				m_io_service.run_one();
 			}
 			// Ignore "short read" error
@@ -665,11 +663,8 @@ namespace net_utils
 		boost::asio::io_service m_io_service;
 		epee::net_utils::ssl_context_t m_ctx;
 		std::shared_ptr<boost::asio::ssl::stream<boost::asio::ip::tcp::socket>> m_ssl_socket;
+		std::function<connect_func> m_connector;
 		epee::net_utils::ssl_support_t m_ssl_support;
-		std::string m_ssl_private_key;
-		std::string m_ssl_certificate;
-		std::list<std::string> m_ssl_allowed_certificates;
-		bool m_ssl_allow_any_cerl;
 		bool m_initialized;
 		bool m_connected;
 		boost::asio::steady_timer m_deadline;
@@ -790,3 +785,4 @@ namespace net_utils
 	};
 }
 }
+

contrib/epee/include/net/net_utils_base.h

@@ -44,6 +44,12 @@
 #define MAKE_IP( a1, a2, a3, a4 )	(a1|(a2<<8)|(a3<<16)|(a4<<24))
 #endif
 
+#if BOOST_VERSION >= 107000
+#define GET_IO_SERVICE(s) ((boost::asio::io_context&)(s).get_executor().context())
+#else
+#define GET_IO_SERVICE(s) ((s).get_io_service())
+#endif
+
 namespace net
 {
 	class tor_address;

contrib/epee/src/CMakeLists.txt

@@ -26,8 +26,9 @@
 # STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
 # THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-add_library(epee STATIC hex.cpp http_auth.cpp mlog.cpp net_utils_base.cpp string_tools.cpp wipeable_string.cpp memwipe.c
+add_library(epee STATIC hex.cpp http_auth.cpp mlog.cpp net_helper.cpp net_utils_base.cpp string_tools.cpp wipeable_string.cpp memwipe.c
     connection_basic.cpp network_throttle.cpp network_throttle-detail.cpp mlocker.cpp buffer.cpp net_ssl.cpp)
+
 if (USE_READLINE AND GNU_READLINE_FOUND)
   add_library(epee_readline STATIC readline_buffer.cpp)
 endif()

contrib/epee/src/net_helper.cpp

@@ -0,0 +1,54 @@
+#include "net/net_helper.h"
+
+namespace epee
+{
+namespace net_utils
+{
+	boost::unique_future<boost::asio::ip::tcp::socket>
+	direct_connect::operator()(const std::string& addr, const std::string& port, boost::asio::steady_timer& timeout) const
+	{
+		// Get a list of endpoints corresponding to the server name.
+		//////////////////////////////////////////////////////////////////////////
+		boost::asio::ip::tcp::resolver resolver(GET_IO_SERVICE(timeout));
+		boost::asio::ip::tcp::resolver::query query(boost::asio::ip::tcp::v4(), addr, port, boost::asio::ip::tcp::resolver::query::canonical_name);
+		boost::asio::ip::tcp::resolver::iterator iterator = resolver.resolve(query);
+		boost::asio::ip::tcp::resolver::iterator end;
+		if(iterator == end) // Documentation states that successful call is guaranteed to be non-empty
+			throw boost::system::system_error{boost::asio::error::fault, "Failed to resolve " + addr};
+
+		//////////////////////////////////////////////////////////////////////////
+
+		struct new_connection
+		{
+			boost::promise<boost::asio::ip::tcp::socket> result_;
+			boost::asio::ip::tcp::socket socket_;
+
+			explicit new_connection(boost::asio::io_service& io_service)
+			  : result_(), socket_(io_service)
+			{}
+		};
+
+		const auto shared = std::make_shared<new_connection>(GET_IO_SERVICE(timeout));
+		timeout.async_wait([shared] (boost::system::error_code error)
+		{
+			if (error != boost::system::errc::operation_canceled && shared && shared->socket_.is_open())
+			{
+				shared->socket_.shutdown(boost::asio::ip::tcp::socket::shutdown_both);
+				shared->socket_.close();
+			}
+		});
+		shared->socket_.async_connect(*iterator, [shared] (boost::system::error_code error)
+		{
+			if (shared)
+			{
+				if (error)
+					shared->result_.set_exception(boost::system::system_error{error});
+				else
+					shared->result_.set_value(std::move(shared->socket_));
+			}
+		});
+		return shared->result_.get_future();
+	}
+}
+}
+

src/net/CMakeLists.txt

@@ -26,8 +26,8 @@
 # STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
 # THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-set(net_sources error.cpp parse.cpp socks.cpp tor_address.cpp i2p_address.cpp)
+set(net_sources error.cpp i2p_address.cpp parse.cpp socks.cpp socks_connect.cpp tor_address.cpp)
-set(net_headers error.h parse.h socks.h tor_address.h i2p_address.h)
+set(net_headers error.h i2p_address.h parse.h socks.h socks_connect.h tor_address.h)
 
 monero_add_library(net ${net_sources} ${net_headers})
 target_link_libraries(net common epee ${Boost_ASIO_LIBRARY})

src/net/socks.cpp

@@ -1,4 +1,4 @@
-// Copyright (c) 2018, The Monero Project
+// Copyright (c) 2018-2019, The Monero Project
 //
 // All rights reserved.
 //
@@ -193,7 +193,7 @@ namespace socks
                 else if (bytes < self.buffer().size())
                     self.done(socks::error::bad_write, std::move(self_));
                 else
-                    boost::asio::async_read(self.proxy_, get_buffer(self), completed{std::move(self_)});
+                    boost::asio::async_read(self.proxy_, get_buffer(self), self.strand_.wrap(completed{std::move(self_)}));
             }
         }
     };
@@ -215,13 +215,13 @@ namespace socks
                 if (error)
                     self.done(error, std::move(self_));
                 else
-                    boost::asio::async_write(self.proxy_, get_buffer(self), read{std::move(self_)});
+                    boost::asio::async_write(self.proxy_, get_buffer(self), self.strand_.wrap(read{std::move(self_)}));
             }
         }
     };
 
     client::client(stream_type::socket&& proxy, socks::version ver)
-      : proxy_(std::move(proxy)), buffer_size_(0), buffer_(), ver_(ver)
+      : proxy_(std::move(proxy)), strand_(proxy_.get_io_service()), buffer_size_(0), buffer_(), ver_(ver)
     {}
 
     client::~client() {}
@@ -296,7 +296,7 @@ namespace socks
         if (self && !self->buffer().empty())
         {
             client& alias = *self;
-            alias.proxy_.async_connect(proxy_address, write{std::move(self)});
+            alias.proxy_.async_connect(proxy_address, alias.strand_.wrap(write{std::move(self)}));
             return true;
         }
         return false;
@@ -307,10 +307,26 @@ namespace socks
         if (self && !self->buffer().empty())
         {
             client& alias = *self;
-            boost::asio::async_write(alias.proxy_, write::get_buffer(alias), read{std::move(self)});
+            boost::asio::async_write(alias.proxy_, write::get_buffer(alias), alias.strand_.wrap(read{std::move(self)}));
             return true;
         }
         return false;
     }
+
+    void client::async_close::operator()(boost::system::error_code error)
+    {
+        if (self_ && error != boost::system::errc::operation_canceled)
+        {
+            const std::shared_ptr<client> self = std::move(self_);
+            self->strand_.dispatch([self] ()
+            {
+                if (self && self->proxy_.is_open())
+                {
+                    self->proxy_.shutdown(boost::asio::ip::tcp::socket::shutdown_both);
+                    self->proxy_.close();
+                }
+            });
+        }
+    }
 } // socks
 } // net

src/net/socks.h

@@ -1,4 +1,4 @@
-// Copyright (c) 2018, The Monero Project
+// Copyright (c) 2018-2019, The Monero Project
 //
 // All rights reserved.
 //
@@ -31,6 +31,7 @@
 #include <cstdint>
 #include <boost/asio/ip/tcp.hpp>
 #include <boost/asio/io_service.hpp>
+#include <boost/asio/strand.hpp>
 #include <boost/system/error_code.hpp>
 #include <boost/type_traits/integral_constant.hpp>
 #include <boost/utility/string_ref.hpp>
@@ -92,6 +93,7 @@ namespace socks
     class client
     {
         boost::asio::ip::tcp::socket proxy_;
+        boost::asio::io_service::strand strand_;
         std::uint16_t buffer_size_;
         std::uint8_t buffer_[1024];
         socks::version ver_;
@@ -168,6 +170,8 @@ namespace socks
 
             \note Must use one of the `self->set_*_command` calls before using
                 this function.
+            \note Only `async_close` can be invoked on `self` until the `done`
+                callback is invoked.
 
             \param self ownership of object is given to function.
             \param proxy_address of the socks server.
@@ -182,11 +186,21 @@ namespace socks
 
             \note Must use one of the `self->set_*_command` calls before using
                 the function.
+            \note Only `async_close` can be invoked on `self` until the `done`
+                callback is invoked.
 
             \param self ownership of object is given to function.
             \return False if `self->buffer().empty()` (no command set).
         */
         static bool send(std::shared_ptr<client> self);
+
+        /*! Callback for closing socket. Thread-safe with `*send` functions;
+            never blocks (uses strands). */
+        struct async_close
+        {
+            std::shared_ptr<client> self_;
+            void operator()(boost::system::error_code error = boost::system::error_code{});
+        };
     };
 
     template<typename Handler>

src/net/socks_connect.cpp

@@ -0,0 +1,90 @@
+// Copyright (c) 2019, The Monero Project
+//
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without modification, are
+// permitted provided that the following conditions are met:
+//
+// 1. Redistributions of source code must retain the above copyright notice, this list of
+//    conditions and the following disclaimer.
+//
+// 2. Redistributions in binary form must reproduce the above copyright notice, this list
+//    of conditions and the following disclaimer in the documentation and/or other
+//    materials provided with the distribution.
+//
+// 3. Neither the name of the copyright holder nor the names of its contributors may be
+//    used to endorse or promote products derived from this software without specific
+//    prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
+// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
+// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
+// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#include "socks_connect.h"
+
+#include <boost/system/error_code.hpp>
+#include <boost/system/system_error.hpp>
+#include <cstdint>
+#include <memory>
+#include <system_error>
+
+#include "net/error.h"
+#include "net/net_utils_base.h"
+#include "net/socks.h"
+#include "string_tools.h"
+
+namespace net
+{
+namespace socks
+{
+    boost::unique_future<boost::asio::ip::tcp::socket>
+    connector::operator()(const std::string& remote_host, const std::string& remote_port, boost::asio::steady_timer& timeout) const
+    {
+        struct future_socket
+        {
+            boost::promise<boost::asio::ip::tcp::socket> result_;
+
+            void operator()(boost::system::error_code error, boost::asio::ip::tcp::socket&& socket)
+            {
+                if (error)
+                    result_.set_exception(boost::system::system_error{error});
+                else
+                    result_.set_value(std::move(socket));
+            }
+        };
+
+        boost::unique_future<boost::asio::ip::tcp::socket> out{};
+        {
+            std::uint16_t port = 0;
+            if (!epee::string_tools::get_xtype_from_string(port, remote_port))
+                throw std::system_error{net::error::invalid_port, "Remote port for socks proxy"};
+
+            bool is_set = false;
+            std::uint32_t ip_address = 0;
+            boost::promise<boost::asio::ip::tcp::socket> result{};
+            out = result.get_future();
+            const auto proxy = net::socks::make_connect_client(
+                boost::asio::ip::tcp::socket{GET_IO_SERVICE(timeout)}, net::socks::version::v4a, future_socket{std::move(result)}
+            );
+
+            if (epee::string_tools::get_ip_int32_from_string(ip_address, remote_host))
+                is_set = proxy->set_connect_command(epee::net_utils::ipv4_network_address{ip_address, port});
+            else
+                is_set = proxy->set_connect_command(remote_host, port);
+
+            if (!is_set || !net::socks::client::connect_and_send(proxy, proxy_address))
+                throw std::system_error{net::error::invalid_host, "Address for socks proxy"};
+
+            timeout.async_wait(net::socks::client::async_close{std::move(proxy)});
+        }
+
+        return out;
+    }
+} // socks
+} // net

src/net/socks_connect.h

@@ -0,0 +1,55 @@
+// Copyright (c) 2019, The Monero Project
+//
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without modification, are
+// permitted provided that the following conditions are met:
+//
+// 1. Redistributions of source code must retain the above copyright notice, this list of
+//    conditions and the following disclaimer.
+//
+// 2. Redistributions in binary form must reproduce the above copyright notice, this list
+//    of conditions and the following disclaimer in the documentation and/or other
+//    materials provided with the distribution.
+//
+// 3. Neither the name of the copyright holder nor the names of its contributors may be
+//    used to endorse or promote products derived from this software without specific
+//    prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
+// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
+// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
+// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#pragma once
+
+#include <boost/asio/ip/tcp.hpp>
+#include <boost/asio/steady_timer.hpp>
+#include <boost/thread/future.hpp>
+#include <string>
+
+namespace net
+{
+namespace socks
+{
+    //! Primarily for use with `epee::net_utils::http_client`.
+    struct connector
+    {
+        boost::asio::ip::tcp::endpoint proxy_address;
+
+        /*! Creates a new socket, asynchronously connects to `proxy_address`,
+            and requests a connection to `remote_host` on `remote_port`. Sets
+            socket as closed if `timeout` is reached.
+
+            \return The socket if successful, and exception in the future with
+                error otherwise. */
+        boost::unique_future<boost::asio::ip::tcp::socket>
+            operator()(const std::string& remote_host, const std::string& remote_port, boost::asio::steady_timer& timeout) const;
+    };
+} // socks
+} // net

src/wallet/CMakeLists.txt

@@ -63,6 +63,7 @@ target_link_libraries(wallet
     cryptonote_core
     mnemonics
     device_trezor
+    net
     ${LMDB_LIBRARY}
     ${Boost_CHRONO_LIBRARY}
     ${Boost_SERIALIZATION_LIBRARY}

src/wallet/api/wallet.cpp

@@ -2173,8 +2173,7 @@ void WalletImpl::pendingTxPostProcess(PendingTransactionImpl * pending)
 
 bool WalletImpl::doInit(const string &daemon_address, uint64_t upper_transaction_size_limit, bool ssl)
 {
-    // claim RPC so there's no in-memory encryption for now
+    if (!m_wallet->init(daemon_address, m_daemon_login, tcp::endpoint{}, upper_transaction_size_limit))
-    if (!m_wallet->init(daemon_address, m_daemon_login, upper_transaction_size_limit, ssl))
        return false;
 
     // in case new wallet, this will force fast-refresh (pulling hashes instead of blocks)

src/wallet/wallet2.cpp

@@ -38,6 +38,7 @@
 #include <boost/algorithm/string/trim.hpp>
 #include <boost/algorithm/string/split.hpp>
 #include <boost/algorithm/string/join.hpp>
+#include <boost/asio/ip/address.hpp>
 #include <boost/range/adaptor/transformed.hpp>
 #include "include_base_utils.h"
 using namespace epee;
@@ -75,6 +76,7 @@ using namespace epee;
 #include "ringdb.h"
 #include "device/device_cold.hpp"
 #include "device_trezor/device_trezor.hpp"
+#include "net/socks_connect.h"
 
 extern "C"
 {
@@ -231,6 +233,7 @@ namespace
 struct options {
   const command_line::arg_descriptor<std::string> daemon_address = {"daemon-address", tools::wallet2::tr("Use daemon instance at <host>:<port>"), ""};
   const command_line::arg_descriptor<std::string> daemon_host = {"daemon-host", tools::wallet2::tr("Use daemon instance at host <arg> instead of localhost"), ""};
+  const command_line::arg_descriptor<std::string> proxy = {"proxy", tools::wallet2::tr("[<ip>:]<port> socks proxy to use for daemon connections"), {}, true};
   const command_line::arg_descriptor<bool> trusted_daemon = {"trusted-daemon", tools::wallet2::tr("Enable commands which rely on a trusted daemon"), false};
   const command_line::arg_descriptor<bool> untrusted_daemon = {"untrusted-daemon", tools::wallet2::tr("Disable commands which rely on a trusted daemon"), false};
   const command_line::arg_descriptor<std::string> password = {"password", tools::wallet2::tr("Wallet password (escape/quote as needed)"), "", true};
@@ -303,6 +306,8 @@ std::string get_weight_string(const cryptonote::transaction &tx, size_t blob_siz
 
 std::unique_ptr<tools::wallet2> make_basic(const boost::program_options::variables_map& vm, bool unattended, const options& opts, const std::function<boost::optional<tools::password_container>(const char *, bool)> &password_prompter)
 {
+  namespace ip = boost::asio::ip;
+
   const bool testnet = command_line::get_arg(vm, opts.testnet);
   const bool stagenet = command_line::get_arg(vm, opts.stagenet);
   const network_type nettype = testnet ? TESTNET : stagenet ? STAGENET : MAINNET;
@@ -352,6 +357,44 @@ std::unique_ptr<tools::wallet2> make_basic(const boost::program_options::variabl
   if (daemon_address.empty())
     daemon_address = std::string("http://") + daemon_host + ":" + std::to_string(daemon_port);
 
+  boost::asio::ip::tcp::endpoint proxy{};
+  if (command_line::has_arg(vm, opts.proxy))
+  {
+    namespace ip = boost::asio::ip;
+    const boost::string_ref real_daemon = boost::string_ref{daemon_address}.substr(0, daemon_address.rfind(':'));
+
+    // onion and i2p addresses contain information about the server cert
+    // which both authenticates and encrypts
+    const bool unencrypted_proxy =
+      !real_daemon.ends_with(".onion") && !real_daemon.ends_with(".i2p") &&
+      daemon_ssl_allowed_certificates.empty() && daemon_ssl_allowed_fingerprints.empty();
+    THROW_WALLET_EXCEPTION_IF(
+      unencrypted_proxy,
+      tools::error::wallet_internal_error,
+      std::string{"Use of --"} + opts.proxy.name + " requires --" + opts.daemon_ssl_allowed_certificates.name + " or --" + opts.daemon_ssl_allowed_fingerprints.name + " or use of a .onion/.i2p domain"
+    );
+
+    const auto proxy_address = command_line::get_arg(vm, opts.proxy);
+
+    boost::string_ref proxy_port{proxy_address};
+    boost::string_ref proxy_host = proxy_port.substr(0, proxy_port.rfind(":"));
+    if (proxy_port.size() == proxy_host.size())
+      proxy_host = "127.0.0.1";
+    else
+      proxy_port = proxy_port.substr(proxy_host.size() + 1);
+
+    uint16_t port_value = 0;
+    THROW_WALLET_EXCEPTION_IF(
+      !epee::string_tools::get_xtype_from_string(port_value, std::string{proxy_port}),
+      tools::error::wallet_internal_error,
+      std::string{"Invalid port specified for --"} + opts.proxy.name
+    );
+
+    boost::system::error_code error{};
+    proxy = ip::tcp::endpoint{ip::address::from_string(std::string{proxy_host}, error), port_value};
+    THROW_WALLET_EXCEPTION_IF(bool(error), tools::error::wallet_internal_error, std::string{"Invalid IP address specified for --"} + opts.proxy.name);
+  }
+
   boost::optional<bool> trusted_daemon;
   if (!command_line::is_arg_defaulted(vm, opts.trusted_daemon) || !command_line::is_arg_defaulted(vm, opts.untrusted_daemon))
     trusted_daemon = command_line::get_arg(vm, opts.trusted_daemon) && !command_line::get_arg(vm, opts.untrusted_daemon);
@@ -388,8 +431,7 @@ std::unique_ptr<tools::wallet2> make_basic(const boost::program_options::variabl
   std::transform(daemon_ssl_allowed_fingerprints.begin(), daemon_ssl_allowed_fingerprints.end(), ssl_allowed_fingerprints.begin(), epee::from_hex::vector);
 
   std::unique_ptr<tools::wallet2> wallet(new tools::wallet2(nettype, kdf_rounds, unattended));
-  wallet->init(std::move(daemon_address), std::move(login), 0, *trusted_daemon, ssl_support, std::make_pair(daemon_ssl_private_key, daemon_ssl_certificate), ssl_allowed_certificates, ssl_allowed_fingerprints, daemon_ssl_allow_any_cert);
+  wallet->init(std::move(daemon_address), std::move(login), std::move(proxy), 0, *trusted_daemon, ssl_support, std::make_pair(daemon_ssl_private_key, daemon_ssl_certificate), ssl_allowed_certificates, ssl_allowed_fingerprints, daemon_ssl_allow_any_cert);
-
   boost::filesystem::path ringdb_path = command_line::get_arg(vm, opts.shared_ringdb_dir);
   wallet->set_ring_database(ringdb_path.string());
   wallet->get_message_store().set_options(vm);
@@ -1046,6 +1088,7 @@ void wallet2::init_options(boost::program_options::options_description& desc_par
   const options opts{};
   command_line::add_arg(desc_params, opts.daemon_address);
   command_line::add_arg(desc_params, opts.daemon_host);
+  command_line::add_arg(desc_params, opts.proxy);
   command_line::add_arg(desc_params, opts.trusted_daemon);
   command_line::add_arg(desc_params, opts.untrusted_daemon);
   command_line::add_arg(desc_params, opts.password);
@@ -1109,7 +1152,7 @@ std::unique_ptr<wallet2> wallet2::make_dummy(const boost::program_options::varia
 }
 
 //----------------------------------------------------------------------------------------------------
-bool wallet2::init(std::string daemon_address, boost::optional<epee::net_utils::http::login> daemon_login, uint64_t upper_transaction_weight_limit, bool trusted_daemon, epee::net_utils::ssl_support_t ssl_support, const std::pair<std::string, std::string> &private_key_and_certificate_path, const std::list<std::string> &allowed_certificates, const std::vector<std::vector<uint8_t>> &allowed_fingerprints, bool allow_any_cert)
+bool wallet2::init(std::string daemon_address, boost::optional<epee::net_utils::http::login> daemon_login, boost::asio::ip::tcp::endpoint proxy, uint64_t upper_transaction_weight_limit, bool trusted_daemon, epee::net_utils::ssl_support_t ssl_support, const std::pair<std::string, std::string> &private_key_and_certificate_path, const std::list<std::string> &allowed_certificates, const std::vector<std::vector<uint8_t>> &allowed_fingerprints, bool allow_any_cert)
 {
   m_checkpoints.init_default_checkpoints(m_nettype);
   if(m_http_client.is_connected())
@@ -1119,6 +1162,10 @@ bool wallet2::init(std::string daemon_address, boost::optional<epee::net_utils::
   m_daemon_address = std::move(daemon_address);
   m_daemon_login = std::move(daemon_login);
   m_trusted_daemon = trusted_daemon;
+  if (proxy != boost::asio::ip::tcp::endpoint{})
+    m_http_client.set_connector(net::socks::connector{std::move(proxy)});
+
+  // When switching from light wallet to full wallet, we need to reset the height we got from lw node.
   return m_http_client.set_server(get_daemon_address(), get_daemon_login(), ssl_support, private_key_and_certificate_path, allowed_certificates, allowed_fingerprints, allow_any_cert);
 }
 //----------------------------------------------------------------------------------------------------

src/wallet/wallet2.h

@@ -680,7 +680,9 @@ namespace tools
 
     bool deinit();
     bool init(std::string daemon_address = "http://localhost:8080",
-      boost::optional<epee::net_utils::http::login> daemon_login = boost::none, uint64_t upper_transaction_weight_limit = 0,
+      boost::optional<epee::net_utils::http::login> daemon_login = boost::none,
+      boost::asio::ip::tcp::endpoint proxy = {},
+      uint64_t upper_transaction_weight_limit = 0,
       bool trusted_daemon = true,
       epee::net_utils::ssl_support_t ssl_support = epee::net_utils::ssl_support_t::e_ssl_support_autodetect,
       const std::pair<std::string, std::string> &private_key_and_certificate_path = {},

tests/fuzz/cold-outputs.cpp

@@ -53,7 +53,7 @@ int ColdOutputsFuzzer::init()
 
   try
   {
-    wallet.init("", boost::none, 0, true, epee::net_utils::ssl_support_t::e_ssl_support_disabled);
+    wallet.init("", boost::none, boost::asio::ip::tcp::endpoint{}, 0, true, epee::net_utils::ssl_support_t::e_ssl_support_disabled);
     wallet.set_subaddress_lookahead(1, 1);
     wallet.generate("", "", spendkey, true, false);
   }

tests/fuzz/cold-transaction.cpp

@@ -54,7 +54,7 @@ int ColdTransactionFuzzer::init()
 
   try
   {
-    wallet.init("", boost::none, 0, true, epee::net_utils::ssl_support_t::e_ssl_support_disabled);
+    wallet.init("", boost::none, boost::asio::ip::tcp::endpoint{}, 0, true, epee::net_utils::ssl_support_t::e_ssl_support_disabled);
     wallet.set_subaddress_lookahead(1, 1);
     wallet.generate("", "", spendkey, true, false);
   }

tests/fuzz/signature.cpp

@@ -54,7 +54,7 @@ int SignatureFuzzer::init()
 
   try
   {
-    wallet.init("", boost::none, 0, true, epee::net_utils::ssl_support_t::e_ssl_support_disabled);
+    wallet.init("", boost::none, boost::asio::ip::tcp::endpoint{}, 0, true, epee::net_utils::ssl_support_t::e_ssl_support_disabled);
     wallet.set_subaddress_lookahead(1, 1);
     wallet.generate("", "", spendkey, true, false);
 

tests/unit_tests/multisig.cpp

@@ -71,7 +71,7 @@ static void make_wallet(unsigned int idx, tools::wallet2 &wallet)
 
   try
   {
-    wallet.init("", boost::none, 0, true, epee::net_utils::ssl_support_t::e_ssl_support_disabled);
+    wallet.init("", boost::none, boost::asio::ip::tcp::endpoint{}, 0, true, epee::net_utils::ssl_support_t::e_ssl_support_disabled);
     wallet.set_subaddress_lookahead(1, 1);
     wallet.generate("", "", spendkey, true, false);
     ASSERT_TRUE(test_addresses[idx].address == wallet.get_account().get_public_address_str(cryptonote::TESTNET));

tests/unit_tests/net.cpp

@@ -33,6 +33,7 @@
 #include <boost/asio/io_service.hpp>
 #include <boost/asio/ip/tcp.hpp>
 #include <boost/asio/read.hpp>
+#include <boost/asio/steady_timer.hpp>
 #include <boost/asio/write.hpp>
 #include <boost/endian/conversion.hpp>
 #include <boost/system/error_code.hpp>
@@ -45,6 +46,7 @@
 #include "net/error.h"
 #include "net/net_utils_base.h"
 #include "net/socks.h"
+#include "net/socks_connect.h"
 #include "net/parse.h"
 #include "net/tor_address.h"
 #include "p2p/net_peerlist_boost_serialization.h"
@@ -742,4 +744,92 @@ TEST(socks_client, resolve_command)
     while (test_client->called_ == 1);
 }
 
+TEST(socks_connector, host)
+{
+    io_thread io{};
+    boost::asio::steady_timer timeout{io.io_service};
+    timeout.expires_from_now(std::chrono::seconds{5});
+
+    boost::unique_future<boost::asio::ip::tcp::socket> sock =
+        net::socks::connector{io.acceptor.local_endpoint()}("example.com", "8080", timeout);
+
+    while (!io.connected);
+    const std::uint8_t expected_bytes[] = {
+        4, 1, 0x1f, 0x90, 0x00, 0x00, 0x00, 0x01, 0x00,
+        'e', 'x', 'a', 'm', 'p', 'l', 'e', '.', 'c', 'o', 'm', 0x00
+    };
+
+    std::uint8_t actual_bytes[sizeof(expected_bytes)];
+    boost::asio::read(io.server, boost::asio::buffer(actual_bytes));
+    EXPECT_TRUE(std::memcmp(expected_bytes, actual_bytes, sizeof(actual_bytes)) == 0);
+
+    const std::uint8_t reply_bytes[] = {0, 90, 0, 0, 0, 0, 0, 0};
+    boost::asio::write(io.server, boost::asio::buffer(reply_bytes));
+
+    ASSERT_EQ(boost::future_status::ready, sock.wait_for(boost::chrono::seconds{3}));
+    EXPECT_TRUE(sock.get().is_open());
+}
+
+TEST(socks_connector, ipv4)
+{
+    io_thread io{};
+    boost::asio::steady_timer timeout{io.io_service};
+    timeout.expires_from_now(std::chrono::seconds{5});
+
+    boost::unique_future<boost::asio::ip::tcp::socket> sock =
+        net::socks::connector{io.acceptor.local_endpoint()}("250.88.125.99", "8080", timeout);
+
+    while (!io.connected);
+    const std::uint8_t expected_bytes[] = {
+        4, 1, 0x1f, 0x90, 0xfa, 0x58, 0x7d, 0x63, 0x00
+    };
+
+    std::uint8_t actual_bytes[sizeof(expected_bytes)];
+    boost::asio::read(io.server, boost::asio::buffer(actual_bytes));
+    EXPECT_TRUE(std::memcmp(expected_bytes, actual_bytes, sizeof(actual_bytes)) == 0);
+
+    const std::uint8_t reply_bytes[] = {0, 90, 0, 0, 0, 0, 0, 0};
+    boost::asio::write(io.server, boost::asio::buffer(reply_bytes));
+
+    ASSERT_EQ(boost::future_status::ready, sock.wait_for(boost::chrono::seconds{3}));
+    EXPECT_TRUE(sock.get().is_open());
+}
+
+TEST(socks_connector, error)
+{
+    io_thread io{};
+    boost::asio::steady_timer timeout{io.io_service};
+    timeout.expires_from_now(std::chrono::seconds{5});
+
+    boost::unique_future<boost::asio::ip::tcp::socket> sock =
+        net::socks::connector{io.acceptor.local_endpoint()}("250.88.125.99", "8080", timeout);
+
+    while (!io.connected);
+    const std::uint8_t expected_bytes[] = {
+        4, 1, 0x1f, 0x90, 0xfa, 0x58, 0x7d, 0x63, 0x00
+    };
+
+    std::uint8_t actual_bytes[sizeof(expected_bytes)];
+    boost::asio::read(io.server, boost::asio::buffer(actual_bytes));
+    EXPECT_TRUE(std::memcmp(expected_bytes, actual_bytes, sizeof(actual_bytes)) == 0);
+
+    const std::uint8_t reply_bytes[] = {0, 91, 0, 0, 0, 0, 0, 0};
+    boost::asio::write(io.server, boost::asio::buffer(reply_bytes));
+
+    ASSERT_EQ(boost::future_status::ready, sock.wait_for(boost::chrono::seconds{3}));
+    EXPECT_THROW(sock.get().is_open(), boost::system::system_error);
+}
+
+TEST(socks_connector, timeout)
+{
+    io_thread io{};
+    boost::asio::steady_timer timeout{io.io_service};
+    timeout.expires_from_now(std::chrono::milliseconds{10});
+
+    boost::unique_future<boost::asio::ip::tcp::socket> sock =
+        net::socks::connector{io.acceptor.local_endpoint()}("250.88.125.99", "8080", timeout);
+
+    ASSERT_EQ(boost::future_status::ready, sock.wait_for(boost::chrono::seconds{3}));
+    EXPECT_THROW(sock.get().is_open(), boost::system::system_error);
+}