MDEV-22668: "Flush SSL" command doesn't reload wsrep cert

Trigger `socket.ssl_reload` when FLUSH SSL is issued. To triger reloading
of certificate, key and CA, files needs to be physically changed.
Reviewed-by: Jan Lindström <jan.lindstrom@mariadb.com>

mysql-test/std_data/galera_certs/INFORMATION

+WSREP certificates signed with root certificate.
+Password used is `galera`.

mysql-test/std_data/galera_certs/galera.1.crt

+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----

mysql-test/std_data/galera_certs/galera.1.csr

+-----BEGIN CERTIFICATE REQUEST-----
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+-----END CERTIFICATE REQUEST-----

mysql-test/std_data/galera_certs/galera.1.key

+-----BEGIN RSA PRIVATE KEY-----
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+-----END RSA PRIVATE KEY-----

mysql-test/std_data/galera_certs/galera.2.crt

+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----

mysql-test/std_data/galera_certs/galera.2.csr

+-----BEGIN CERTIFICATE REQUEST-----
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+-----END CERTIFICATE REQUEST-----

mysql-test/std_data/galera_certs/galera.2.key

+-----BEGIN RSA PRIVATE KEY-----
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+-----END RSA PRIVATE KEY-----

mysql-test/std_data/galera_certs/galera.root.crt

+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----

mysql-test/std_data/galera_certs/galera.root.key

+-----BEGIN RSA PRIVATE KEY-----
+Proc-Type: 4,ENCRYPTED
+DEK-Info: DES-EDE3-CBC,F0ACFFE47CF32BB2
+
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+-----END RSA PRIVATE KEY-----

mysql-test/std_data/galera_certs/galera.root.srl

+6D409518A9205687DA79FBF6FB2253AB3CCB1AB1

mysql-test/suite/galera_3nodes/r/galera_ssl_reload.result

+connection node_2;
+connection node_1;
+connect node_3, 127.0.0.1, root, , test, $NODE_MYPORT_3;
+connection node_1;
+connection node_2;
+connection node_3;
+connection node_1;
+connection node_2;
+connection node_2;
+# restart: with restart_parameters
+SET GLOBAL wsrep_provider_options = 'socket.ssl_reload=1';
+connection node_3;
+# restart: with restart_parameters
+connection node_2;
+FLUSH SSL;

mysql-test/suite/galera_3nodes/t/galera_ssl_reload.cnf

+!include ../galera_3nodes.cnf
+
+[mysqld.1]
+wsrep_provider_options='base_port=@mysqld.1.#galera_port;socket.ssl=yes;socket.ssl_ca=@ENV.MYSQL_TEST_DIR/std_data/galera_certs/galera.root.crt;socket.ssl_cert=@ENV.MYSQL_TEST_DIR/std_data/galera_certs/galera.1.crt;socket.ssl_key=@ENV.MYSQL_TEST_DIR/std_data/galera_certs/galera.1.key'
+
+[mysqld.2]
+wsrep_provider_options='base_port=@mysqld.2.#galera_port;socket.ssl=yes;socket.ssl_ca=@ENV.MYSQL_TEST_DIR/std_data/galera_certs/galera.root.crt;socket.ssl_cert=@ENV.MYSQL_TEST_DIR/std_data/galera_certs/galera.1.crt;socket.ssl_key=@ENV.MYSQL_TEST_DIR/std_data/galera_certs/galera.1.key'
+
+[mysqld.3]
+wsrep_provider_options='base_port=@mysqld.3.#galera_port;socket.ssl=yes;socket.ssl_ca=@ENV.MYSQL_TEST_DIR/std_data/galera_certs/galera.root.crt;socket.ssl_cert=@ENV.MYSQL_TEST_DIR/std_data/galera_certs/galera.1.crt;socket.ssl_key=@ENV.MYSQL_TEST_DIR/std_data/galera_certs/galera.1.key'

mysql-test/suite/galera_3nodes/t/galera_ssl_reload.test

+#
+# Test reloading of Galera SSL certificate without shutting down node
+#
+
+--source include/galera_cluster.inc
+--source include/have_innodb.inc
+
+--connect node_3, 127.0.0.1, root, , test, $NODE_MYPORT_3
+
+# Save original auto_increment_offset values.
+--let $node_1=node_1
+--let $node_2=node_2
+--let $node_3=node_3
+--source ../galera/include/auto_increment_offset_save.inc
+
+# Setup galera ports
+--connection node_1
+--source suite/galera/include/galera_base_port.inc
+--let $NODE_GALERAPORT_1 = $_NODE_GALERAPORT
+
+--connection node_2
+--source suite/galera/include/galera_base_port.inc
+--let $NODE_GALERAPORT_2 = $_NODE_GALERAPORT
+
+# Setup temporary file for SSL reloading
+let $ssl_cert = $MYSQLTEST_VARDIR/tmp/ssl_cert.pem;
+let $ssl_key = $MYSQLTEST_VARDIR/tmp/ssl_key.pem;
+let $ssl_ca = $MYSQLTEST_VARDIR/tmp/ssl_ca.pem;
+
+copy_file std_data/galera_certs/galera.root.crt $ssl_ca;
+copy_file std_data/galera_certs/galera.1.crt $ssl_cert;
+copy_file std_data/galera_certs/galera.1.key $ssl_key;
+
+--connection node_2
+--source include/shutdown_mysqld.inc
+--let $restart_noprint=1
+--let $restart_parameters = --wsrep_cluster_address=gcomm://127.0.0.1:$NODE_GALERAPORT_1 --wsrep_provider_options=base_port=$NODE_GALERAPORT_2;socket.ssl=yes;socket.ssl_ca=$MYSQL_TEST_DIR/std_data/galera_certs/galera.root.crt;socket.ssl_cert=$MYSQLTEST_VARDIR/tmp/ssl_cert.pem;socket.ssl_key=$MYSQLTEST_VARDIR/tmp/ssl_key.pem
+--source include/start_mysqld.inc
+--source include/galera_wait_ready.inc
+
+# Set certificate and key and reload by setting directly `wsrep_provider_options`
+remove_file $ssl_cert;
+remove_file $ssl_key;
+copy_file std_data/galera_certs/galera.2.crt $ssl_cert;
+copy_file std_data/galera_certs/galera.2.key $ssl_key;
+SET GLOBAL wsrep_provider_options = 'socket.ssl_reload=1';
+
+--connection node_3
+--source include/shutdown_mysqld.inc
+--let $restart_parameters = --wsrep_cluster_address=gcomm://127.0.0.1:$NODE_GALERAPORT_2
+--source include/start_mysqld.inc
+
+# Set certificate and key and reload by executing `FLUSH SSL`
+--connection node_2
+remove_file $ssl_cert;
+remove_file $ssl_key;
+copy_file std_data/galera_certs/galera.1.crt $ssl_cert;
+copy_file std_data/galera_certs/galera.1.key $ssl_key;
+FLUSH SSL;
+
+# Cleanup
+remove_file $ssl_ca;
+remove_file $ssl_cert;
+remove_file $ssl_key;
+
+# Restore original auto_increment_offset values.
+--source ../galera/include/auto_increment_offset_restore.inc

sql/sql_reload.cc

@@ -416,6 +416,14 @@ bool reload_acl_and_cache(THD *thd, unsigned long long options,
  {
    if (reinit_ssl())
      result= 1;
+#ifdef WITH_WSREP
+   if (!result &&
+       WSREP_ON && wsrep_reload_ssl())
+   {
+     my_message(ER_UNKNOWN_ERROR, "Failed to refresh WSREP SSL.", MYF(0));
+     result= 1;
+   }
+#endif
  }
  if (options & REFRESH_GENERIC)
  {

sql/wsrep_mysqld.cc

@@ -1249,6 +1249,32 @@ wsrep_append_fk_parent_table(THD* thd, TABLE_LIST* tables, wsrep::key_array* key
     return fail;
 }
 
+bool wsrep_reload_ssl()
+{
+  try
+  {
+    std::string opts= Wsrep_server_state::instance().provider().options();
+    if (opts.find("socket.ssl_reload") == std::string::npos)
+    {
+      WSREP_DEBUG("Option `socket.ssl_reload` not found in parameters.");
+      return false;
+    }
+    const std::string reload_ssl_param("socket.ssl_reload=1");
+    enum wsrep::provider::status ret= Wsrep_server_state::instance().provider().options(reload_ssl_param);
+    if (ret)
+    {
+      WSREP_ERROR("Set options returned %d", ret);
+      return true;
+    }
+    return false;
+  }
+  catch (...)
+  {
+    WSREP_ERROR("Failed to get provider options");
+    return true;
+  }
+}
+
 /*!
  * @param db      Database string
  * @param table   Table string

sql/wsrep_mysqld.h

@@ -214,6 +214,7 @@ extern void wsrep_last_committed_id (wsrep_gtid_t* gtid);
 extern int  wsrep_check_opts();
 extern void wsrep_prepend_PATH (const char* path);
 extern bool wsrep_append_fk_parent_table(THD* thd, TABLE_LIST* table, wsrep::key_array* keys);
+extern bool wsrep_reload_ssl();
 
 /* Other global variables */
 extern wsrep_seqno_t wsrep_locked_seqno;