epee: add SSL support

RPC connections now have optional tranparent SSL.

An optional private key and certificate file can be passed,
using the --{rpc,daemon}-ssl-private-key and
--{rpc,daemon}-ssl-certificate options. Those have as
argument a path to a PEM format private private key and
certificate, respectively.
If not given, a temporary self signed certificate will be used.

SSL can be enabled or disabled using --{rpc}-ssl, which
accepts autodetect (default), disabled or enabled.

Access can be restricted to particular certificates using the
--rpc-ssl-allowed-certificates, which takes a list of
paths to PEM encoded certificates. This can allow a wallet to
connect to only the daemon they think they're connected to,
by forcing SSL and listing the paths to the known good
certificates.

To generate long term certificates:

openssl genrsa -out /tmp/KEY 4096
openssl req -new -key /tmp/KEY -out /tmp/REQ
openssl x509 -req -days 999999 -sha256 -in /tmp/REQ -signkey /tmp/KEY -out /tmp/CERT

/tmp/KEY is the private key, and /tmp/CERT is the certificate,
both in PEM format. /tmp/REQ can be removed. Adjust the last
command to set expiration date, etc, as needed. It doesn't
make a whole lot of sense for monero anyway, since most servers
will run with one time temporary self signed certificates anyway.

SSL support is transparent, so all communication is done on the
existing ports, with SSL autodetection. This means you can start
using an SSL daemon now, but you should not enforce SSL yet or
nothing will talk to you.

2 files changed, 13 insertions, 10 deletions

diff --git a/src/p2p/net_node.h b/src/p2p/net_node.h
index 112f30fb6..58e3c8857 100644
--- a/src/p2p/net_node.h
+++ b/src/p2p/net_node.h
@@ -129,7 +129,7 @@ namespace nodetool
     typedef epee::net_utils::boosted_tcp_server<epee::levin::async_protocol_handler<p2p_connection_context>> net_server;
 
     struct network_zone;
-    using connect_func = boost::optional<p2p_connection_context>(network_zone&, epee::net_utils::network_address const&);
+    using connect_func = boost::optional<p2p_connection_context>(network_zone&, epee::net_utils::network_address const&, epee::net_utils::ssl_support_t);
 
     struct config
     {
@@ -437,8 +437,8 @@ namespace nodetool
     //keep connections to initiate some interactions
 
 
-    static boost::optional<p2p_connection_context> public_connect(network_zone&, epee::net_utils::network_address const&);
-    static boost::optional<p2p_connection_context> socks_connect(network_zone&, epee::net_utils::network_address const&);
+    static boost::optional<p2p_connection_context> public_connect(network_zone&, epee::net_utils::network_address const&, epee::net_utils::ssl_support_t);
+    static boost::optional<p2p_connection_context> socks_connect(network_zone&, epee::net_utils::network_address const&, epee::net_utils::ssl_support_t);
 
 
     /* A `std::map` provides constant iterators and key/value pointers even with
@@ -463,6 +463,8 @@ namespace nodetool
 
     boost::uuids::uuid m_network_id;
     cryptonote::network_type m_nettype;
+
+    epee::net_utils::ssl_support_t m_ssl_support;
   };
 
     const int64_t default_limit_up = P2P_DEFAULT_LIMIT_RATE_UP;      // kB/s
diff --git a/src/p2p/net_node.inl b/src/p2p/net_node.inl
index 471fdda0d..e3d804086 100644
--- a/src/p2p/net_node.inl
+++ b/src/p2p/net_node.inl
@@ -650,6 +650,7 @@ namespace nodetool
       return res;
 
     //try to bind
+    m_ssl_support = epee::net_utils::ssl_support_t::e_ssl_support_disabled;
     for (auto& zone : m_network_zones)
     {
       zone.second.m_net_server.get_config_object().set_handler(this);
@@ -659,7 +660,7 @@ namespace nodetool
       {
         zone.second.m_net_server.set_connection_filter(this);
         MINFO("Binding on " << zone.second.m_bind_ip << ":" << zone.second.m_port);
-        res = zone.second.m_net_server.init_server(zone.second.m_port, zone.second.m_bind_ip);
+        res = zone.second.m_net_server.init_server(zone.second.m_port, zone.second.m_bind_ip, epee::net_utils::ssl_support_t::e_ssl_support_disabled);
         CHECK_AND_ASSERT_MES(res, false, "Failed to bind server");
       }
     }
@@ -1057,7 +1058,7 @@ namespace nodetool
         << (last_seen_stamp ? epee::misc_utils::get_time_interval_string(time(NULL) - last_seen_stamp):"never")
         << ")...");
 
-    auto con = zone.m_connect(zone, na);
+    auto con = zone.m_connect(zone, na, m_ssl_support);
     if(!con)
     {
       bool is_priority = is_priority_node(na);
@@ -1119,7 +1120,7 @@ namespace nodetool
                                   << (last_seen_stamp ? epee::misc_utils::get_time_interval_string(time(NULL) - last_seen_stamp):"never")
                                   << ")...");
 
-    auto con = zone.m_connect(zone, na);
+    auto con = zone.m_connect(zone, na, m_ssl_support);
     if (!con) {
       bool is_priority = is_priority_node(na);
 
@@ -2456,13 +2457,13 @@ namespace nodetool
 
   template<typename t_payload_net_handler>
   boost::optional<p2p_connection_context_t<typename t_payload_net_handler::connection_context>>
-  node_server<t_payload_net_handler>::socks_connect(network_zone& zone, const epee::net_utils::network_address& remote)
+  node_server<t_payload_net_handler>::socks_connect(network_zone& zone, const epee::net_utils::network_address& remote, epee::net_utils::ssl_support_t ssl_support)
   {
     auto result = socks_connect_internal(zone.m_net_server.get_stop_signal(), zone.m_net_server.get_io_service(), zone.m_proxy_address, remote);
     if (result) // if no error
     {
       p2p_connection_context context{};
-      if (zone.m_net_server.add_connection(context, std::move(*result), remote))
+      if (zone.m_net_server.add_connection(context, std::move(*result), remote, ssl_support))
         return {std::move(context)};
     }
     return boost::none;
@@ -2470,7 +2471,7 @@ namespace nodetool
 
   template<typename t_payload_net_handler>
   boost::optional<p2p_connection_context_t<typename t_payload_net_handler::connection_context>>
-  node_server<t_payload_net_handler>::public_connect(network_zone& zone, epee::net_utils::network_address const& na)
+  node_server<t_payload_net_handler>::public_connect(network_zone& zone, epee::net_utils::network_address const& na, epee::net_utils::ssl_support_t ssl_support)
   {
     CHECK_AND_ASSERT_MES(na.get_type_id() == epee::net_utils::ipv4_network_address::get_type_id(), boost::none,
       "Only IPv4 addresses are supported here");
@@ -2480,7 +2481,7 @@ namespace nodetool
     const bool res = zone.m_net_server.connect(epee::string_tools::get_ip_string_from_int32(ipv4.ip()),
       epee::string_tools::num_to_string_fast(ipv4.port()),
       zone.m_config.m_net_config.connection_timeout,
-      con);
+      con, "0.0.0.0", ssl_support);
 
     if (res)
       return {std::move(con)};