mirror of
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105 lines
2.9 KiB
C
105 lines
2.9 KiB
C
/* Copyright (C) 2010 Sergei Golubchik and Monty Program Ab
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Copyright (c) 2010, 2011, Oracle and/or its affiliates.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; version 2 of the
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License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
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/**
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@file
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auth_socket authentication plugin.
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Authentication is successful if the connection is done via a unix socket and
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the owner of the client process matches the user name that was used when
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connecting to mysqld.
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*/
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#define _GNU_SOURCE 1 /* for struct ucred */
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#include <mysql/plugin_auth.h>
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#include <sys/socket.h>
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#include <pwd.h>
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#include <string.h>
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/**
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perform the unix socket based authentication
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This authentication callback performs a unix socket based authentication -
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it gets the uid of the client process and considers the user authenticated
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if it uses username of this uid. That is - if the user is already
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authenticated to the OS (if she is logged in) - she can use MySQL as herself
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*/
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static int socket_auth(MYSQL_PLUGIN_VIO *vio, MYSQL_SERVER_AUTH_INFO *info)
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{
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unsigned char *pkt;
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MYSQL_PLUGIN_VIO_INFO vio_info;
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struct ucred cred;
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socklen_t cred_len= sizeof(cred);
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struct passwd pwd_buf, *pwd;
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char buf[1024];
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/* no user name yet ? read the client handshake packet with the user name */
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if (info->user_name == 0)
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{
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if (vio->read_packet(vio, &pkt) < 0)
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return CR_ERROR;
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}
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info->password_used= PASSWORD_USED_NO_MENTION;
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vio->info(vio, &vio_info);
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if (vio_info.protocol != MYSQL_VIO_SOCKET)
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return CR_ERROR;
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/* get the UID of the client process */
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if (getsockopt(vio_info.socket, SOL_SOCKET, SO_PEERCRED, &cred, &cred_len))
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return CR_ERROR;
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if (cred_len != sizeof(cred))
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return CR_ERROR;
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/* and find the username for this uid */
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getpwuid_r(cred.uid, &pwd_buf, buf, sizeof(buf), &pwd);
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if (pwd == NULL)
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return CR_ERROR;
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/* now it's simple as that */
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return strcmp(pwd->pw_name, info->user_name) ? CR_ERROR : CR_OK;
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}
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static struct st_mysql_auth socket_auth_handler=
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{
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MYSQL_AUTHENTICATION_INTERFACE_VERSION,
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0,
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socket_auth
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};
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maria_declare_plugin(socket_auth)
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{
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MYSQL_AUTHENTICATION_PLUGIN,
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&socket_auth_handler,
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"unix_socket",
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"Sergei Golubchik",
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"Unix Socket based authentication",
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PLUGIN_LICENSE_GPL,
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NULL,
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NULL,
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0x0100,
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NULL,
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NULL,
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"1.0",
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MariaDB_PLUGIN_MATURITY_STABLE
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}
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maria_declare_plugin_end;
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