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.

7 files changed, 31 insertions, 19 deletions

diff --git a/contrib/epee/include/hex.h b/contrib/epee/include/hex.h
index 901c666a9..250432173 100644
--- a/contrib/epee/include/hex.h
+++ b/contrib/epee/include/hex.h
@@ -32,6 +32,7 @@
 #include <cstdint>
 #include <iosfwd>
 #include <string>
+#include <boost/utility/string_ref.hpp>
 
 #include "wipeable_string.h"
 #include "span.h"
@@ -68,4 +69,10 @@ namespace epee
     //! Write `src` bytes as hex to `out`. `out` must be twice the length
     static void buffer_unchecked(char* out, const span<const std::uint8_t> src) noexcept;
   };
+
+  struct from_hex
+  {
+      //! \return An std::vector of unsigned integers from the `src`
+      static std::vector<uint8_t> vector(boost::string_ref src);
+  };
 }
diff --git a/contrib/epee/include/net/abstract_tcp_server2.h b/contrib/epee/include/net/abstract_tcp_server2.h
index 76773192e..ec08c0f4b 100644
--- a/contrib/epee/include/net/abstract_tcp_server2.h
+++ b/contrib/epee/include/net/abstract_tcp_server2.h
@@ -228,8 +228,8 @@ namespace net_utils
     std::map<std::string, t_connection_type> server_type_map;
     void create_server_type_map();
 
-    bool init_server(uint32_t port, const std::string address = "0.0.0.0", 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 = std::make_pair(std::string(), std::string()), const std::list<std::string> &allowed_certificates = {}, bool allow_any_cert = false);
-    bool init_server(const std::string port,  const std::string& address = "0.0.0.0", 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 = std::make_pair(std::string(), std::string()), const std::list<std::string> &allowed_certificates = {}, bool allow_any_cert = false);
+    bool init_server(uint32_t port, const std::string address = "0.0.0.0", 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 = std::make_pair(std::string(), std::string()), const std::list<std::string> &allowed_certificates = {}, const std::vector<std::vector<uint8_t>> &allowed_fingerprints = {}, bool allow_any_cert = false);
+    bool init_server(const std::string port,  const std::string& address = "0.0.0.0", 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 = std::make_pair(std::string(), std::string()), const std::list<std::string> &allowed_certificates = {}, const std::vector<std::vector<uint8_t>> &allowed_fingerprints = {}, bool allow_any_cert = false);
 
     /// Run the server's io_service loop.
     bool run_server(size_t threads_count, bool wait = true, const boost::thread::attributes& attrs = boost::thread::attributes());
diff --git a/contrib/epee/include/net/abstract_tcp_server2.inl b/contrib/epee/include/net/abstract_tcp_server2.inl
index 39d6911e3..f5548c585 100644
--- a/contrib/epee/include/net/abstract_tcp_server2.inl
+++ b/contrib/epee/include/net/abstract_tcp_server2.inl
@@ -900,7 +900,7 @@ PRAGMA_WARNING_DISABLE_VS(4355)
     m_thread_index(0),
 		m_connection_type( connection_type ),
     new_connection_(),
-    m_ssl_context({boost::asio::ssl::context(boost::asio::ssl::context::sslv23), {}})
+    m_ssl_context({boost::asio::ssl::context(boost::asio::ssl::context::tlsv12), {}})
   {
     create_server_type_map();
     m_thread_name_prefix = "NET";
@@ -939,14 +939,14 @@ PRAGMA_WARNING_DISABLE_VS(4355)
   }
   //---------------------------------------------------------------------------------
   template<class t_protocol_handler>
-  bool boosted_tcp_server<t_protocol_handler>::init_server(uint32_t port, const std::string address, 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, bool allow_any_cert)
+  bool boosted_tcp_server<t_protocol_handler>::init_server(uint32_t port, const std::string address, 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)
   {
     TRY_ENTRY();
     m_stop_signal_sent = false;
     m_port = port;
     m_address = address;
     if (ssl_support != epee::net_utils::ssl_support_t::e_ssl_support_disabled)
-      m_ssl_context = create_ssl_context(private_key_and_certificate_path, allowed_certificates, allow_any_cert);
+      m_ssl_context = create_ssl_context(private_key_and_certificate_path, allowed_certificates, allowed_fingerprints, allow_any_cert);
     // Open the acceptor with the option to reuse the address (i.e. SO_REUSEADDR).
     boost::asio::ip::tcp::resolver resolver(io_service_);
     boost::asio::ip::tcp::resolver::query query(address, boost::lexical_cast<std::string>(port), boost::asio::ip::tcp::resolver::query::canonical_name);
@@ -980,7 +980,7 @@ PRAGMA_WARNING_DISABLE_VS(4355)
 PUSH_WARNINGS
 DISABLE_GCC_WARNING(maybe-uninitialized)
   template<class t_protocol_handler>
-  bool boosted_tcp_server<t_protocol_handler>::init_server(const std::string port, const std::string& address, 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, bool allow_any_cert)
+  bool boosted_tcp_server<t_protocol_handler>::init_server(const std::string port, const std::string& address, 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)
   {
     uint32_t p = 0;
 
@@ -988,7 +988,7 @@ DISABLE_GCC_WARNING(maybe-uninitialized)
       MERROR("Failed to convert port no = " << port);
       return false;
     }
-    return this->init_server(p, address, ssl_support, private_key_and_certificate_path, allowed_certificates, allow_any_cert);
+    return this->init_server(p, address, ssl_support, private_key_and_certificate_path, allowed_certificates, allowed_fingerprints, allow_any_cert);
   }
 POP_WARNINGS
   //---------------------------------------------------------------------------------
diff --git a/contrib/epee/include/net/http_client.h b/contrib/epee/include/net/http_client.h
index 34b3ac06c..58a8e6888 100644
--- a/contrib/epee/include/net/http_client.h
+++ b/contrib/epee/include/net/http_client.h
@@ -278,6 +278,7 @@ namespace net_utils
 			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;
+			std::vector<std::vector<uint8_t>> m_ssl_allowed_fingerprints;
 			bool m_ssl_allow_any_cert;
 
 		public:
@@ -302,16 +303,16 @@ namespace net_utils
 			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, 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)
+			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 = {}, const std::vector<std::vector<uint8_t>> &allowed_ssl_fingerprints = {}, 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_support, private_key_and_certificate_path, allowed_ssl_certificates, allow_any_cert);
+				set_server(std::move(parsed.host), std::to_string(parsed.port), std::move(user), ssl_support, private_key_and_certificate_path, allowed_ssl_certificates, allowed_ssl_fingerprints, allow_any_cert);
 				return true;
 			}
 
-			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)
+			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 = {}, const std::vector<std::vector<uint8_t>> &allowed_ssl_fingerprints = {}, bool allow_any_cert = false)
 			{
 				CRITICAL_REGION_LOCAL(m_lock);
 				disconnect();
@@ -321,8 +322,9 @@ namespace net_utils
 				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_allowed_fingerprints = allowed_ssl_fingerprints;
 				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);
+				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);
 			}
 
       bool connect(std::chrono::milliseconds timeout)
diff --git a/contrib/epee/include/net/http_server_impl_base.h b/contrib/epee/include/net/http_server_impl_base.h
index 236067580..0922f21f2 100644
--- a/contrib/epee/include/net/http_server_impl_base.h
+++ b/contrib/epee/include/net/http_server_impl_base.h
@@ -61,7 +61,9 @@ namespace epee
       boost::optional<net_utils::http::login> user = boost::none,
       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_certificates = std::list<std::string>(), bool allow_any_cert = false)
+      std::list<std::string> allowed_certificates = {},
+      std::vector<std::vector<uint8_t>> allowed_fingerprints = {},
+      bool allow_any_cert = false)
     {
 
       //set self as callback handler
@@ -78,7 +80,7 @@ namespace epee
       m_net_server.get_config_object().m_user = std::move(user);
 
       MGINFO("Binding on " << bind_ip << ":" << bind_port);
-      bool res = m_net_server.init_server(bind_port, bind_ip, ssl_support, private_key_and_certificate_path, allowed_certificates, allow_any_cert);
+      bool res = m_net_server.init_server(bind_port, bind_ip, ssl_support, private_key_and_certificate_path, std::move(allowed_certificates), std::move(allowed_fingerprints), allow_any_cert);
       if(!res)
       {
         LOG_ERROR("Failed to bind server");
diff --git a/contrib/epee/include/net/net_helper.h b/contrib/epee/include/net/net_helper.h
index 5d9bb61cf..742cf916e 100644
--- a/contrib/epee/include/net/net_helper.h
+++ b/contrib/epee/include/net/net_helper.h
@@ -93,7 +93,7 @@ namespace net_utils
                             m_deadline(m_io_service), 
                             m_shutdowned(0),
                             m_ssl_support(epee::net_utils::ssl_support_t::e_ssl_support_autodetect),
-                            m_ctx({boost::asio::ssl::context(boost::asio::ssl::context::sslv23), {}}),
+                            m_ctx({boost::asio::ssl::context(boost::asio::ssl::context::tlsv12), {}}),
                             m_ssl_socket(new boost::asio::ssl::stream<boost::asio::ip::tcp::socket>(m_io_service,m_ctx.context))
 		{
 			
@@ -118,12 +118,12 @@ namespace net_utils
 			catch(...) { /* ignore */ }
 		}
 
-		inline void set_ssl(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_certificates = std::list<std::string>(), bool allow_any_cert = false)
+		inline void set_ssl(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 = {}, std::list<std::string> allowed_certificates = {}, std::vector<std::vector<uint8_t>> allowed_fingerprints = {}, bool allow_any_cert = false)
 		{
 			if (ssl_support == epee::net_utils::ssl_support_t::e_ssl_support_disabled)
-				m_ctx = {boost::asio::ssl::context(boost::asio::ssl::context::sslv23), {}};
+				m_ctx = {boost::asio::ssl::context(boost::asio::ssl::context::tlsv12), {}, {}};
 			else
-				m_ctx = create_ssl_context(private_key_and_certificate_path, allowed_certificates, allow_any_cert);
+				m_ctx = create_ssl_context(private_key_and_certificate_path, std::move(allowed_certificates), std::move(allowed_fingerprints), allow_any_cert);
 			m_ssl_support = ssl_support;
 		}
 
diff --git a/contrib/epee/include/net/net_ssl.h b/contrib/epee/include/net/net_ssl.h
index 9ae1883af..ca53d3667 100644
--- a/contrib/epee/include/net/net_ssl.h
+++ b/contrib/epee/include/net/net_ssl.h
@@ -50,16 +50,17 @@ namespace net_utils
 	{
 		boost::asio::ssl::context context;
 		std::list<std::string> allowed_certificates;
+		std::vector<std::vector<uint8_t>> allowed_fingerprints;
 		bool allow_any_cert;
 	};
 
         // https://security.stackexchange.com/questions/34780/checking-client-hello-for-https-classification
 	constexpr size_t get_ssl_magic_size() { return 9; }
 	bool is_ssl(const unsigned char *data, size_t len);
-	ssl_context_t create_ssl_context(const std::pair<std::string, std::string> &private_key_and_certificate_path, std::list<std::string> allowed_certificates, bool allow_any_cert);
+	ssl_context_t create_ssl_context(const std::pair<std::string, std::string> &private_key_and_certificate_path, std::list<std::string> allowed_certificates, std::vector<std::vector<uint8_t>> allowed_fingerprints, bool allow_any_cert);
 	void use_ssl_certificate(ssl_context_t &ssl_context, const std::pair<std::string, std::string> &private_key_and_certificate_path);
 	bool create_ssl_certificate(std::string &pkey_buffer, std::string &cert_buffer);
-	bool is_certificate_allowed(boost::asio::ssl::verify_context &ctx, const std::list<std::string> &allowed_certificates);
+	bool is_certificate_allowed(boost::asio::ssl::verify_context &ctx, const ssl_context_t &ssl_context);
 	bool ssl_handshake(boost::asio::ssl::stream<boost::asio::ip::tcp::socket> &socket, boost::asio::ssl::stream_base::handshake_type type, const epee::net_utils::ssl_context_t &ssl_context);
         bool ssl_support_from_string(ssl_support_t &ssl, boost::string_ref s);
 }