Change default SSL to "enabled" if user specifies fingerprint/certificate

Currently if a user specifies a ca file or fingerprint to verify peer,
the default behavior is SSL autodetect which allows for mitm downgrade
attacks. It should be investigated whether a manual override should be
allowed - the configuration is likely always invalid.

2 files changed, 17 insertions, 7 deletions

diff --git a/src/wallet/wallet2.cpp b/src/wallet/wallet2.cpp
index c4f466699..9e2a826d9 100644
--- a/src/wallet/wallet2.cpp
+++ b/src/wallet/wallet2.cpp
@@ -325,9 +325,14 @@ std::unique_ptr<tools::wallet2> make_basic(const boost::program_options::variabl
   auto daemon_ssl_allowed_fingerprints = command_line::get_arg(vm, opts.daemon_ssl_allowed_fingerprints);
   auto daemon_ssl_allow_any_cert = command_line::get_arg(vm, opts.daemon_ssl_allow_any_cert);
   auto daemon_ssl = command_line::get_arg(vm, opts.daemon_ssl);
-  epee::net_utils::ssl_support_t ssl_support;
-  THROW_WALLET_EXCEPTION_IF(!epee::net_utils::ssl_support_from_string(ssl_support, daemon_ssl), tools::error::wallet_internal_error,
-      tools::wallet2::tr("Invalid argument for ") + std::string(opts.daemon_ssl.name));
+
+  // user specified CA file or fingeprints implies enabled SSL by default
+  epee::net_utils::ssl_support_t ssl_support = epee::net_utils::ssl_support_t::e_ssl_support_enabled;
+  if ((daemon_ssl_ca_file.empty() && daemon_ssl_allowed_fingerprints.empty()) || !command_line::is_arg_defaulted(vm, opts.daemon_ssl))
+  {
+    THROW_WALLET_EXCEPTION_IF(!epee::net_utils::ssl_support_from_string(ssl_support, daemon_ssl), tools::error::wallet_internal_error,
+       tools::wallet2::tr("Invalid argument for ") + std::string(opts.daemon_ssl.name));
+  }
 
   THROW_WALLET_EXCEPTION_IF(!daemon_address.empty() && !daemon_host.empty() && 0 != daemon_port,
       tools::error::wallet_internal_error, tools::wallet2::tr("can't specify daemon host or port more than once"));
diff --git a/src/wallet/wallet_rpc_server.cpp b/src/wallet/wallet_rpc_server.cpp
index 7824ed62e..a07e8e767 100644
--- a/src/wallet/wallet_rpc_server.cpp
+++ b/src/wallet/wallet_rpc_server.cpp
@@ -250,11 +250,16 @@ namespace tools
     auto rpc_ssl_ca_file = command_line::get_arg(vm, arg_rpc_ssl_ca_certificates);
     auto rpc_ssl_allowed_fingerprints = command_line::get_arg(vm, arg_rpc_ssl_allowed_fingerprints);
     auto rpc_ssl = command_line::get_arg(vm, arg_rpc_ssl);
-    epee::net_utils::ssl_support_t rpc_ssl_support;
-    if (!epee::net_utils::ssl_support_from_string(rpc_ssl_support, rpc_ssl))
+    epee::net_utils::ssl_support_t rpc_ssl_support = epee::net_utils::ssl_support_t::e_ssl_support_enabled;
+
+    // user specified CA file or fingeprints implies enabled SSL by default
+    if ((rpc_ssl_ca_file.empty() && rpc_ssl_allowed_fingerprints.empty()) || !command_line::is_arg_defaulted(vm, arg_rpc_ssl))
     {
-      MERROR("Invalid argument for " << std::string(arg_rpc_ssl.name));
-      return false;
+      if (!epee::net_utils::ssl_support_from_string(rpc_ssl_support, rpc_ssl))
+      {
+        MERROR("Invalid argument for " << std::string(arg_rpc_ssl.name));
+        return false;
+      }
     }
 
     std::vector<std::vector<uint8_t>> allowed_fingerprints{ rpc_ssl_allowed_fingerprints.size() };