Disable SSL by default (#25)

* Print the connection type used (with/without SSL)
* Update CHANGELOG

Co-authored-by: Antonio Andelic <antonio.andelic@memgraph.io>

CHANGELOG.md

@@ -2,6 +2,11 @@
 
 ## v1.2.0
 
+### Breaking Changes
+
+* SSL is disabled by default (`--bolt-cert-file` and `--bolt-key-file` are
+  empty). This change might only affect the client connection configuration.
+
 ### Major Features and Improvements
 
 * Added support for Bolt v4.0 and v4.1.

config/flags.yaml

@@ -39,14 +39,6 @@ modifications:
     value: "/var/log/memgraph/memgraph.log"
     override: true
 
-  - name: "bolt_cert_file"
-    value: "/etc/memgraph/ssl/cert.pem"
-    override: true
-
-  - name: "bolt_key_file"
-    value: "/etc/memgraph/ssl/key.pem"
-    override: true
-
   - name: "bolt_num_workers"
     value: ""
     override: false

src/memgraph.cpp

@@ -1002,6 +1002,9 @@ int main(int argc, char **argv) {
   if (!FLAGS_bolt_key_file.empty() && !FLAGS_bolt_cert_file.empty()) {
     context = ServerContext(FLAGS_bolt_key_file, FLAGS_bolt_cert_file);
     service_name = "BoltS";
+    std::cout << "Using secure Bolt connection (with SSL)" << std::endl;
+  } else {
+    std::cout << "Using non-secure Bolt connection (without SSL)" << std::endl;
   }
 
   ServerT server({FLAGS_bolt_address, static_cast<uint16_t>(FLAGS_bolt_port)},