1 files changed, 14 insertions, 2 deletions
diff --git a/lib/net/smtp.rb b/lib/net/smtp.rb
index 52ea003771..1143def104 100644
--- a/lib/net/smtp.rb
+++ b/lib/net/smtp.rb
@@ -542,13 +542,17 @@ module Net
 
     private
 
+    def tcp_socket(address, port)
+      TCPSocket.open address, port
+    end
+
     def do_start(helo_domain, user, secret, authtype)
       raise IOError, 'SMTP session already started' if @started
       if user or secret
         check_auth_method(authtype || DEFAULT_AUTH_TYPE)
         check_auth_args user, secret
       end
-      s = timeout(@open_timeout) { TCPSocket.open(@address, @port) }
+      s = timeout(@open_timeout) { tcp_socket(@address, @port) }
       logging "Connection opened: #{@address}:#{@port}"
       @socket = new_internet_message_io(tls? ? tlsconnect(s) : s)
       check_response critical { recv_response() }
@@ -573,15 +577,23 @@ module Net
       end
     end
 
+    def ssl_socket(socket, context)
+      OpenSSL::SSL::SSLSocket.new socket, context
+    end
+
     def tlsconnect(s)
-      s = OpenSSL::SSL::SSLSocket.new(s, @ssl_context)
+      verified = false
+      s = ssl_socket(s, @ssl_context)
       logging "TLS connection started"
       s.sync_close = true
       s.connect
       if @ssl_context.verify_mode != OpenSSL::SSL::VERIFY_NONE
         s.post_connection_check(@address)
       end
+      verified = true
       s
+    ensure
+      s.close unless verified
     end
 
     def new_internet_message_io(s)