text: /* Copyright (C) 2015 Vladislav Vaintroub, Georg Richter 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_pipe authentication plugin.
  
    Authentication is successful if the connection is done via a named pipe 
    pipe peer name matches mysql user name
  */
  
  #include <mysql/plugin_auth.h>
  #include <string.h>
  #include <lmcons.h>
  
  
  /**
    This authentication callback obtains user name using named pipe impersonation
  */
  static int pipe_auth(MYSQL_PLUGIN_VIO *vio, MYSQL_SERVER_AUTH_INFO *info)
  {
    unsigned char *pkt;
    MYSQL_PLUGIN_VIO_INFO vio_info;
    char username[UNLEN + 1];
    DWORD username_length;
    int ret;
  
    /* no user name yet ? read the client handshake packet with the user name */
    if (info->user_name == 0)
    {
      if (vio->read_packet(vio, &pkt) < 0)
        return CR_ERROR;
    }
    info->password_used= PASSWORD_USED_NO_MENTION;
    vio->info(vio, &vio_info);
    if (vio_info.protocol != MYSQL_VIO_PIPE)
      return CR_ERROR;
  
    /* Impersonate the named pipe peer, and retrieve the user name */
    if (!ImpersonateNamedPipeClient(vio_info.handle))
      return CR_ERROR;
  
    username_length=UNLEN;
    ret= CR_ERROR;
    if (GetUserName(username, &username_length))
    {
      /* Always compare names case-insensitive on Windows.*/
      if (_stricmp(username, info->user_name) == 0)
        ret= CR_OK;
    }
    RevertToSelf();
  
    return ret;
  }
  
  static struct st_mysql_auth pipe_auth_handler=
  {
    MYSQL_AUTHENTICATION_INTERFACE_VERSION,
    0,
    pipe_auth
  };
  
  maria_declare_plugin(auth_named_pipe)
  {
    MYSQL_AUTHENTICATION_PLUGIN,
    &pipe_auth_handler,
    "named_pipe",
    "Vladislav Vaintroub, Georg Richter",
    "Windows named pipe based authentication",
    PLUGIN_LICENSE_GPL,
    NULL,
    NULL,
    0x0100,
    NULL,
    NULL,
    "1.0",
    MariaDB_PLUGIN_MATURITY_STABLE
  }
  maria_declare_plugin_end;
  
  