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, 16 insertions, 9 deletions

diff --git a/contrib/epee/include/net/http_client.h b/contrib/epee/include/net/http_client.h
index e01691794..34b3ac06c 100644
--- a/contrib/epee/include/net/http_client.h
+++ b/contrib/epee/include/net/http_client.h
@@ -275,7 +275,10 @@ namespace net_utils
 			chunked_state m_chunked_state;
 			std::string m_chunked_cache;
 			critical_section m_lock;
-			bool m_ssl;
+			epee::net_utils::ssl_support_t m_ssl_support;
+			std::pair<std::string, std::string> m_ssl_private_key_and_certificate_path;
+			std::list<std::string> m_ssl_allowed_certificates;
+			bool m_ssl_allow_any_cert;
 
 		public:
 			explicit http_simple_client_template()
@@ -293,35 +296,39 @@ namespace net_utils
 				, m_chunked_state()
 				, m_chunked_cache()
 				, m_lock()
-				, m_ssl(false)
+				, m_ssl_support(epee::net_utils::ssl_support_t::e_ssl_support_autodetect)
 			{}
 
 			const std::string &get_host() const { return m_host_buff; };
 			const std::string &get_port() const { return m_port; };
 
-			bool set_server(const std::string& address, boost::optional<login> user, bool ssl = false)
+			bool set_server(const std::string& address, boost::optional<login> user, 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 = {}, const std::list<std::string> &allowed_ssl_certificates = {}, bool allow_any_cert = false)
 			{
 				http::url_content parsed{};
 				const bool r = parse_url(address, parsed);
 				CHECK_AND_ASSERT_MES(r, false, "failed to parse url: " << address);
-				set_server(std::move(parsed.host), std::to_string(parsed.port), std::move(user), ssl);
+				set_server(std::move(parsed.host), std::to_string(parsed.port), std::move(user), ssl_support, private_key_and_certificate_path, allowed_ssl_certificates, allow_any_cert);
 				return true;
 			}
 
-			void set_server(std::string host, std::string port, boost::optional<login> user, bool ssl = false)
+			void set_server(std::string host, std::string port, boost::optional<login> user, 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 = {}, const std::list<std::string> &allowed_ssl_certificates = {}, bool allow_any_cert = false)
 			{
 				CRITICAL_REGION_LOCAL(m_lock);
 				disconnect();
 				m_host_buff = std::move(host);
 				m_port = std::move(port);
                                 m_auth = user ? http_client_auth{std::move(*user)} : http_client_auth{};
-				m_ssl = ssl;
+				m_ssl_support = ssl_support;
+				m_ssl_private_key_and_certificate_path = private_key_and_certificate_path;
+				m_ssl_allowed_certificates = allowed_ssl_certificates;
+				m_ssl_allow_any_cert = allow_any_cert;
+				m_net_client.set_ssl(m_ssl_support, m_ssl_private_key_and_certificate_path, m_ssl_allowed_certificates, m_ssl_allow_any_cert);
 			}
 
       bool connect(std::chrono::milliseconds timeout)
       {
         CRITICAL_REGION_LOCAL(m_lock);
-        return m_net_client.connect(m_host_buff, m_port, timeout, m_ssl);
+        return m_net_client.connect(m_host_buff, m_port, timeout, "0.0.0.0");
       }
 			//---------------------------------------------------------------------------
 			bool disconnect()
@@ -330,10 +337,10 @@ namespace net_utils
 				return m_net_client.disconnect();
 			}
 			//---------------------------------------------------------------------------
-			bool is_connected()
+			bool is_connected(bool *ssl = NULL)
 			{
 				CRITICAL_REGION_LOCAL(m_lock);
-				return m_net_client.is_connected();
+				return m_net_client.is_connected(ssl);
 			}
 			//---------------------------------------------------------------------------
 			virtual bool handle_target_data(std::string& piece_of_transfer)