MDEV-25418: Improve mariabackup SST script compliance with native MariaDB SSL practices

and configuration.

1. Pass joiner's authentication information to donor together with address
   in State Transfer Request. This allows joiner to authenticate donor on
   connection. Previously joiner would accept data from anywhere.

2. Deprecate custom SSL configuration variables tca, tcert and tkey in favor
   of more familiar ssl-ca, ssl-cert and ssl-key. For backward compatibility
   tca, tcert and tkey are still supported.

3. Allow falling back to server-wide SSL configuration in [mysqld] if no SSL
   configuration is found in [sst] section of the config file.

4. Introduce ssl-mode variable in [sst] section that takes standard values
   and has following effects:
    - old-style SSL configuration present in [sst]: no effect
      otherwise:
    - ssl-mode=DISABLED or absent: retains old, backward compatible behavior
      and ignores any other SSL configuration
    - ssl-mode=VERIFY*: verify joiner's certificate and CN on donor,
                        verify donor's secret on joiner
                        (passed to donor via State Transfer Request)
                        BACKWARD INCOMPATIBLE BEHAVIOR
    - anything else enables new SSL configuration convetions but does not
      require verification

    ssl-mode should be set to VERIFY only in a fully upgraded cluster.

    Examples:

    [mysqld]
    ssl-cert=/path/to/cert
    ssl-key=/path/to/key
    ssl-ca=/path/to/ca

    [sst]

     -- server-wide SSL configuration is ignored, SST does not use SSL

    [mysqld]
    ssl-cert=/path/to/cert
    ssl-key=/path/to/key
    ssl-ca=/path/to/ca

    [sst]
    ssl-mode=REQUIRED

     -- use server-wide SSL configuration for SST but don't attempt to
        verify the peer identity

    [sst]
    ssl-cert=/path/to/cert
    ssl-key=/path/to/key
    ssl-ca=/path/to/ca
    ssl-mode=VERIFY_CA

     -- use SST-specific SSL configuration for SST and require verification
        on both sides
Signed-off-by: Julius Goryavsky <julius.goryavsky@mariadb.com>

mysql-test/suite/galera/r/galera_sst_mariabackup_encrypt_with_key.result

 SELECT 1;
 1
 1
+include/assert_grep.inc [Using openssl based encryption with socat]

mysql-test/suite/galera/r/galera_sst_mariabackup_encrypt_with_key_server.result

+SELECT 1;
+1
+1
+include/assert_grep.inc [Using openssl based encryption with socat]

mysql-test/suite/galera/t/galera_sst_mariabackup_encrypt_with_key.test

 #
-# This test checks that key and cert encryption options can be passed to mariabackup via the my.cnf file
-# Initial SST happens via mariabackup, so there is not much to do in the body of the test
+# This test checks that key and cert encryption options can be passed to
+# mariabackup via the my.cnf file
+# Initial SST happens via mariabackup, so there is not much to do in the body
+# of the test
 #
 
 --source include/big_test.inc
@@ -12,3 +14,11 @@ SELECT 1;
 
 --let $wait_condition = SELECT VARIABLE_VALUE = 2 FROM INFORMATION_SCHEMA.GLOBAL_STATUS WHERE VARIABLE_NAME = 'wsrep_cluster_size';
 --source include/wait_condition.inc
+
+# Confirm that transfer was SSL-encrypted
+--let $assert_text = Using openssl based encryption with socat
+--let $assert_select = Using openssl based encryption with socat: with key and crt
+--let $assert_count = 1
+--let $assert_file = $MYSQLTEST_VARDIR/log/mysqld.1.err
+--let $assert_only_after = CURRENT_TEST
+--source include/assert_grep.inc

mysql-test/suite/galera/t/galera_sst_mariabackup_encrypt_with_key_server.cnf

+!include ../galera_2nodes.cnf
+
+[mysqld]
+wsrep_sst_method=mariabackup
+wsrep_sst_auth="root:"
+wsrep_debug=ON
+
+ssl-cert=@ENV.MYSQL_TEST_DIR/std_data/client-cert.pem
+ssl-key=@ENV.MYSQL_TEST_DIR/std_data/client-key.pem
+ssl-ca=@ENV.MYSQL_TEST_DIR/std_data/cacert.pem
+
+[sst]
+ssl-mode=VERIFY_CA
\ No newline at end of file

mysql-test/suite/galera/t/galera_sst_mariabackup_encrypt_with_key_server.test

+#
+# This test checks that if SST SSL is not explicitly donfigured mariabackup SST
+# uses server SSL configuration if present.
+# Initial SST happens via mariabackup, so there is not much to do in the body
+# of the test
+#
+
+--source include/big_test.inc
+--source include/galera_cluster.inc
+--source include/have_innodb.inc
+--source include/have_mariabackup.inc
+--source include/have_ssl_communication.inc
+
+SELECT 1;
+
+--let $wait_condition = SELECT VARIABLE_VALUE = 2 FROM INFORMATION_SCHEMA.GLOBAL_STATUS WHERE VARIABLE_NAME = 'wsrep_cluster_size';
+--source include/wait_condition.inc
+
+# Confirm that transfer was SSL-encrypted
+--let $assert_text = Using openssl based encryption with socat
+--let $assert_select = Using openssl based encryption with socat: with key and c
+--let $assert_count = 1
+--let $assert_file = $MYSQLTEST_VARDIR/log/mysqld.1.err
+--let $assert_only_after = CURRENT_TEST
+--source include/assert_grep.inc

sql/wsrep_sst.cc

@@ -638,48 +638,29 @@ static void* sst_joiner_thread (void* a)
 }
 
 #define WSREP_SST_AUTH_ENV        "WSREP_SST_OPT_AUTH"
-
-static int sst_append_auth_env(wsp::env& env, const char* sst_auth)
-{
-  int const sst_auth_size= strlen(WSREP_SST_AUTH_ENV) + 1 /* = */
-    + (sst_auth ? strlen(sst_auth) : 0) + 1 /* \0 */;
-
-  wsp::string sst_auth_str(sst_auth_size); // for automatic cleanup on return
-  if (!sst_auth_str()) return -ENOMEM;
-
-  int ret= snprintf(sst_auth_str(), sst_auth_size, "%s=%s",
-                    WSREP_SST_AUTH_ENV, sst_auth ? sst_auth : "");
-
-  if (ret < 0 || ret >= sst_auth_size)
-  {
-    WSREP_ERROR("sst_append_auth_env(): snprintf() failed: %d", ret);
-    return (ret < 0 ? ret : -EMSGSIZE);
-  }
-
-  env.append(sst_auth_str());
-  return -env.error();
-}
-
+#define WSREP_SST_REMOTE_AUTH_ENV "WSREP_SST_OPT_REMOTE_AUTH"
 #define DATA_HOME_DIR_ENV         "INNODB_DATA_HOME_DIR"
 
-static int sst_append_data_dir(wsp::env& env, const char* data_dir)
+static int sst_append_env_var(wsp::env&   env,
+                              const char* const var,
+                              const char* const val)
 {
-  int const data_dir_size= strlen(DATA_HOME_DIR_ENV) + 1 /* = */
-    + (data_dir ? strlen(data_dir) : 0) + 1 /* \0 */;
+  int const env_str_size= strlen(var) + 1 /* = */
+                          + (val ? strlen(val) : 0) + 1 /* \0 */;
 
-  wsp::string data_dir_str(data_dir_size); // for automatic cleanup on return
-  if (!data_dir_str()) return -ENOMEM;
+  wsp::string env_str(env_str_size); // for automatic cleanup on return
+  if (!env_str()) return -ENOMEM;
 
-  int ret= snprintf(data_dir_str(), data_dir_size, "%s=%s",
-                    DATA_HOME_DIR_ENV, data_dir ? data_dir : "");
+  int ret= snprintf(env_str(), env_str_size, "%s=%s", var, val ? val : "");
 
-  if (ret < 0 || ret >= data_dir_size)
+  if (ret < 0 || ret >= env_str_size)
   {
-    WSREP_ERROR("sst_append_data_dir(): snprintf() failed: %d", ret);
+    WSREP_ERROR("sst_append_env_var(): snprintf(%s=%s) failed: %d",
+                var, val, ret);
     return (ret < 0 ? ret : -EMSGSIZE);
   }
 
-  env.append(data_dir_str());
+  env.append(env_str());
   return -env.error();
 }
 
@@ -1090,7 +1071,7 @@ static ssize_t sst_prepare_other (const char*  method,
     return -env.error();
   }
 
-  if ((ret= sst_append_auth_env(env, sst_auth)))
+  if ((ret= sst_append_env_var(env, WSREP_SST_AUTH_ENV, sst_auth)))
   {
     WSREP_ERROR("sst_prepare_other(): appending auth failed: %d", ret);
     return ret;
@@ -1098,7 +1079,7 @@ static ssize_t sst_prepare_other (const char*  method,
 
   if (data_home_dir)
   {
-    if ((ret= sst_append_data_dir(env, data_home_dir)))
+    if ((ret= sst_append_env_var(env, DATA_HOME_DIR_ENV, data_home_dir)))
     {
       WSREP_ERROR("sst_prepare_other(): appending data "
                   "directory failed: %d", ret);
@@ -1275,12 +1256,12 @@ ssize_t wsrep_sst_prepare (void** msg)
 
   *msg = malloc (msg_len);
   if (NULL != *msg) {
-    char* const method_ptr(reinterpret_cast<char*>(*msg));
+    char* const method_ptr(static_cast<char*>(*msg));
     strcpy (method_ptr, wsrep_sst_method);
     char* const addr_ptr(method_ptr + method_len + 1);
     strcpy (addr_ptr, addr_out);
 
-    WSREP_INFO ("Prepared SST request: %s|%s", method_ptr, addr_ptr);
+    WSREP_DEBUG("Prepared SST request: %s|%s", method_ptr, addr_ptr);
   }
   else {
     WSREP_ERROR("Failed to allocate SST request of size %zu. Can't continue.",
@@ -1733,6 +1714,7 @@ static int sst_donate_other (const char*   method,
                  "wsrep_sst_%s "
                  WSREP_SST_OPT_ROLE " 'donor' "
                  WSREP_SST_OPT_ADDR " '%s' "
+                 WSREP_SST_OPT_LPORT " '%u' "
                  WSREP_SST_OPT_SOCKET " '%s' "
                  WSREP_SST_OPT_DATA " '%s' "
                  "%s"
@@ -1740,7 +1722,8 @@ static int sst_donate_other (const char*   method,
                  WSREP_SST_OPT_GTID_DOMAIN_ID " '%d'"
                  "%s"
                  "%s",
-                 method, addr, mysqld_unix_port, mysql_real_data_home,
+                 method, addr, mysqld_port, mysqld_unix_port,
+                 mysql_real_data_home,
                  wsrep_defaults_file,
                  uuid, (long long) seqno, wsrep_gtid_domain_id,
                  binlog_opt_val,
@@ -1820,7 +1803,21 @@ wsrep_cb_status_t wsrep_sst_donate_cb (void* app_ctx, void* recv_ctx,
 
   const char* data   = method + method_len + 1;
 
-  if (check_request_str(data, address_char))
+  /* check for auth@addr separator */
+  const char* addr= strrchr(data, '@');
+  wsp::string remote_auth;
+  if (addr)
+  {
+    remote_auth.set(strndup(data, addr - data));
+    addr++;
+  }
+  else
+  {
+    // no auth part
+    addr= data;
+  }
+
+  if (check_request_str(addr, address_char))
   {
     WSREP_ERROR("Bad SST address string. SST canceled.");
     return WSREP_CB_FAILURE;
@@ -1841,15 +1838,25 @@ wsrep_cb_status_t wsrep_sst_donate_cb (void* app_ctx, void* recv_ctx,
   }
 
   int ret;
-  if ((ret= sst_append_auth_env(env, sst_auth_real)))
+  if ((ret= sst_append_env_var(env, WSREP_SST_AUTH_ENV, sst_auth_real)))
   {
     WSREP_ERROR("wsrep_sst_donate_cb(): appending auth env failed: %d", ret);
     return WSREP_CB_FAILURE;
   }
 
+  if (remote_auth())
+  {
+    if ((ret= sst_append_env_var(env, WSREP_SST_REMOTE_AUTH_ENV,remote_auth())))
+    {
+      WSREP_ERROR("wsrep_sst_donate_cb(): appending remote auth env failed: "
+                  "%d", ret);
+      return WSREP_CB_FAILURE;
+    }
+  }
+
   if (data_home_dir)
   {
-    if ((ret= sst_append_data_dir(env, data_home_dir)))
+    if ((ret= sst_append_env_var(env, DATA_HOME_DIR_ENV, data_home_dir)))
     {
       WSREP_ERROR("wsrep_sst_donate_cb(): appending data "
                   "directory failed: %d", ret);
@@ -1859,12 +1866,12 @@ wsrep_cb_status_t wsrep_sst_donate_cb (void* app_ctx, void* recv_ctx,
 
   if (!strcmp (WSREP_SST_MYSQLDUMP, method))
   {
-    ret = sst_donate_mysqldump(data, &current_gtid->uuid, uuid_str,
+    ret = sst_donate_mysqldump(addr, &current_gtid->uuid, uuid_str,
                                current_gtid->seqno, bypass, env());
   }
   else
   {
-    ret = sst_donate_other(method, data, uuid_str,
+    ret = sst_donate_other(method, addr, uuid_str,
                            current_gtid->seqno, bypass, env());
   }