MDEV-4307 Support at least 48 utf8 characters in username in server and PAM

Extend plugin auth api to support up to 512 bytes in the user names.
Use the API versioning to support old auth plugins too!

2 files changed, 93 insertions, 0 deletions

diff --git a/plugin/auth_examples/CMakeLists.txt b/plugin/auth_examples/CMakeLists.txt
index fb27289770f..f6c2b637067 100644
--- a/plugin/auth_examples/CMakeLists.txt
+++ b/plugin/auth_examples/CMakeLists.txt
@@ -27,5 +27,7 @@ MYSQL_ADD_PLUGIN(qa_auth_server qa_auth_server.c
 MYSQL_ADD_PLUGIN(qa_auth_client qa_auth_client.c
   MODULE_ONLY COMPONENT Test)
 
+MYSQL_ADD_PLUGIN(auth_0x0100 auth_0x0100.c MODULE_ONLY COMPONENT Test)
+
 MYSQL_ADD_PLUGIN(mysql_clear_password clear_password_client.c
   MODULE_ONLY COMPONENT SharedLibraries)
diff --git a/plugin/auth_examples/auth_0x0100.c b/plugin/auth_examples/auth_0x0100.c
new file mode 100644
index 00000000000..d1373b8a0b4
--- /dev/null
+++ b/plugin/auth_examples/auth_0x0100.c
@@ -0,0 +1,91 @@
+/* Copyright (C) 2013 Sergei Golubchik and Monty Program Ab
+
+    This program is free software; you can redistribute it and/or
+    modify it under the terms of the GNU General Public License as
+    published by the Free Software Foundation; version 2 of the
+    License.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
+
+/**
+  @file
+
+  auth plugin that uses old structures as of
+  MYSQL_AUTHENTICATION_INTERFACE_VERSION 0x0100
+
+  To test the old version support.
+  It intentionally uses no constants like CR_OK ok PASSWORD_USED_YES.
+*/
+
+#include <mysql/plugin.h>
+#include <string.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#if 0
+#include <mysql/plugin_auth.h>
+#else
+#define MYSQL_AUTHENTICATION_INTERFACE_VERSION 0x0100
+typedef void MYSQL_PLUGIN_VIO; /* we don't use it here */
+
+typedef struct st_mysql_server_auth_info
+{
+  char *user_name;
+  unsigned int user_name_length;
+  const char *auth_string;
+  unsigned long auth_string_length;
+  char authenticated_as[49]; 
+  char external_user[512];
+  int  password_used;
+  const char *host_or_ip;
+  unsigned int host_or_ip_length;
+} MYSQL_SERVER_AUTH_INFO;
+
+struct st_mysql_auth
+{
+  int interface_version;
+  const char *client_auth_plugin;
+  int (*authenticate_user)(MYSQL_PLUGIN_VIO *vio, MYSQL_SERVER_AUTH_INFO *info);
+};
+#endif
+
+static int do_auth_0x0100(MYSQL_PLUGIN_VIO *vio, MYSQL_SERVER_AUTH_INFO *info)
+{
+  info->password_used= 1;
+  strcpy(info->authenticated_as, "zzzzzzzzzzzzzzzz");
+  memset(info->external_user, 'o', 510);
+  info->external_user[510]='.';
+  info->external_user[511]=0;
+  return vio ? -1 : 0; /* use vio to avoid the 'unused' warning */
+}
+
+static struct st_mysql_auth auth_0x0100_struct=
+{
+  MYSQL_AUTHENTICATION_INTERFACE_VERSION, 0, do_auth_0x0100
+};
+
+maria_declare_plugin(auth_0x0100)
+{
+  MYSQL_AUTHENTICATION_PLUGIN,
+  &auth_0x0100_struct,
+  "auth_0x0100",
+  "Sergei Golubchik",
+  "Test for API 0x0100 support",
+  PLUGIN_LICENSE_GPL,
+  NULL,
+  NULL,
+  0x0100,
+  NULL,
+  NULL,
+  "1.0",
+  MariaDB_PLUGIN_MATURITY_EXPERIMENTAL,
+}
+maria_declare_plugin_end;
+