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.

1 files changed, 7 insertions, 4 deletions

diff --git a/contrib/epee/include/net/net_utils_base.h b/contrib/epee/include/net/net_utils_base.h
index 82f8a7fe8..7ee0106b1 100644
--- a/contrib/epee/include/net/net_utils_base.h
+++ b/contrib/epee/include/net/net_utils_base.h
@@ -241,6 +241,7 @@ namespace net_utils
     const network_address m_remote_address;
     const bool     m_is_income;
     const time_t   m_started;
+    const time_t   m_ssl;
     time_t   m_last_recv;
     time_t   m_last_send;
     uint64_t m_recv_cnt;
@@ -251,13 +252,14 @@ namespace net_utils
     double m_max_speed_up;
 
     connection_context_base(boost::uuids::uuid connection_id,
-                            const network_address &remote_address, bool is_income,
+                            const network_address &remote_address, bool is_income, bool ssl,
                             time_t last_recv = 0, time_t last_send = 0,
                             uint64_t recv_cnt = 0, uint64_t send_cnt = 0):
                                             m_connection_id(connection_id),
                                             m_remote_address(remote_address),
                                             m_is_income(is_income),
                                             m_started(time(NULL)),
+                                            m_ssl(ssl),
                                             m_last_recv(last_recv),
                                             m_last_send(last_send),
                                             m_recv_cnt(recv_cnt),
@@ -272,6 +274,7 @@ namespace net_utils
                                m_remote_address(),
                                m_is_income(false),
                                m_started(time(NULL)),
+                               m_ssl(false),
                                m_last_recv(0),
                                m_last_send(0),
                                m_recv_cnt(0),
@@ -284,17 +287,17 @@ namespace net_utils
 
     connection_context_base& operator=(const connection_context_base& a)
     {
-      set_details(a.m_connection_id, a.m_remote_address, a.m_is_income);
+      set_details(a.m_connection_id, a.m_remote_address, a.m_is_income, a.m_ssl);
       return *this;
     }
     
   private:
     template<class t_protocol_handler>
     friend class connection;
-    void set_details(boost::uuids::uuid connection_id, const network_address &remote_address, bool is_income)
+    void set_details(boost::uuids::uuid connection_id, const network_address &remote_address, bool is_income, bool ssl)
     {
       this->~connection_context_base();
-      new(this) connection_context_base(connection_id, remote_address, is_income);
+      new(this) connection_context_base(connection_id, remote_address, is_income, ssl);
     }
 
 	};