From 43d743e75b7b747341b9a5c36a933b490548bebb Mon Sep 17 00:00:00 2001
From: Karen Arutyunov <karen@codesynthesis.com>
Date: Sat, 4 Nov 2017 01:17:16 +0300
Subject: Add implementation

---
 mysql/plugins/auth/old_password.c | 118 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 118 insertions(+)
 create mode 100644 mysql/plugins/auth/old_password.c

(limited to 'mysql/plugins/auth/old_password.c')

diff --git a/mysql/plugins/auth/old_password.c b/mysql/plugins/auth/old_password.c
new file mode 100644
index 0000000..543a5b1
--- /dev/null
+++ b/mysql/plugins/auth/old_password.c
@@ -0,0 +1,118 @@
+/************************************************************************************
+   Copyright (C) 2014,2015 MariaDB Corporation AB
+   
+   This library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Library General Public
+   License as published by the Free Software Foundation; either
+   version 2 of the License, or (at your option) any later version.
+   
+   This library 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
+   Library General Public License for more details.
+   
+   You should have received a copy of the GNU Library General Public
+   License along with this library; if not see <http://www.gnu.org/licenses>
+   or write to the Free Software Foundation, Inc., 
+   51 Franklin St., Fifth Floor, Boston, MA 02110, USA
+*************************************************************************************/
+#include <ma_global.h>
+#include <mysql.h>
+#include <mysql/client_plugin.h>
+#include <string.h>
+#include <memory.h>
+#include <errmsg.h>
+
+
+/* function prototypes */
+static int auth_old_password(MYSQL_PLUGIN_VIO *vio, MYSQL *mysql);
+
+typedef struct st_mysql_client_plugin_AUTHENTICATION auth_plugin_t;
+
+typedef struct {
+  int (*read_packet)(struct st_plugin_vio *vio, uchar **buf);
+  int (*write_packet)(struct st_plugin_vio *vio, const uchar *pkt, size_t pkt_len);
+  void (*info)(struct st_plugin_vio *vio, struct st_plugin_vio_info *info);
+  /* -= end of MYSQL_PLUGIN_VIO =- */
+  MYSQL *mysql;
+  auth_plugin_t *plugin;             /**< what plugin we're under */
+  const char *db;
+  struct {
+    uchar *pkt;                      /**< pointer into NET::buff */
+    uint pkt_len;
+  } cached_server_reply;
+  uint packets_read, packets_written; /**< counters for send/received packets */
+  my_bool mysql_change_user;          /**< if it's mysql_change_user() */
+  int last_read_packet_len;           /**< the length of the last *read* packet */
+} MCPVIO_EXT;
+
+#ifndef HAVE_OLDPASSWORD_DYNAMIC
+struct st_mysql_client_plugin_AUTHENTICATION old_password_client_plugin=
+#else
+struct st_mysql_client_plugin_AUTHENTICATION _mysql_client_plugin_declaration_ =
+#endif
+{
+  MYSQL_CLIENT_AUTHENTICATION_PLUGIN,
+  MYSQL_CLIENT_AUTHENTICATION_PLUGIN_INTERFACE_VERSION,
+  "mysql_old_password",
+  "Sergei Golubchik, R.J. Silk, Georg Richter",
+  "Old (pre 4.1) authentication plugin",
+  {1,0,0},
+  "LGPL",
+  NULL,
+  NULL,
+  NULL,
+  NULL,
+  auth_old_password
+};
+
+/**
+  client authentication plugin that does old MySQL authentication
+  using an 8-byte (4.0-) scramble
+*/
+
+static int auth_old_password(MYSQL_PLUGIN_VIO *vio, MYSQL *mysql)
+{
+  uchar *pkt;
+  int pkt_len;
+
+  if (((MCPVIO_EXT *)vio)->mysql_change_user)
+  {
+    /*
+      in mysql_change_user() the client sends the first packet.
+      we use the old scramble.
+    */
+    pkt= (uchar*)mysql->scramble_buff;
+    pkt_len= SCRAMBLE_LENGTH_323 + 1;
+  }
+  else
+  {
+    /* read the scramble */
+    if ((pkt_len= vio->read_packet(vio, &pkt)) < 0)
+      return CR_ERROR;
+
+    if (pkt_len != SCRAMBLE_LENGTH_323 + 1 &&
+        pkt_len != SCRAMBLE_LENGTH + 1)
+        return CR_SERVER_HANDSHAKE_ERR;
+
+    /* save it in MYSQL */
+    memmove(mysql->scramble_buff, pkt, pkt_len);
+    mysql->scramble_buff[pkt_len] = 0;
+  }
+
+  if (mysql && mysql->passwd[0])
+  {
+    char scrambled[SCRAMBLE_LENGTH_323 + 1];
+    ma_scramble_323(scrambled, (char*)pkt, mysql->passwd);
+    if (vio->write_packet(vio, (uchar*)scrambled, SCRAMBLE_LENGTH_323 + 1))
+      return CR_ERROR;
+  }
+  else
+    if (vio->write_packet(vio, 0, 0)) /* no password */
+      return CR_ERROR;
+
+  return CR_OK;
+}
+
+
+
-- 
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